WorldWideScience

Sample records for current investigation sought

  1. Investigation of Current Driven Loudspeakers

    DEFF Research Database (Denmark)

    Schneider, Henrik; Agerkvist, Finn T.; Knott, Arnold

    2015-01-01

    Current driven loudspeakers have previously been investigated but the literature is limited and the advantages and disadvantages are yet to be fully identified. This paper makes use of a non-linear loudspeaker model to analyse loudspeakers with distinct non-linear characteristics under voltage...... and current drive. A multi tone test signal is used in the evaluation of the driving schemes since it resembles audio signals to a higher degree than the signals used in total harmonic distortion and intermodulation distortion test methods. It is found that current drive is superior over voltage drive in a 5...

  2. Xerostomia: current streams of investigation.

    Science.gov (United States)

    Quock, Ryan L

    2016-07-01

    Xerostomia is the subjective feeling of dry mouth, and it is often related to salivary hypofunction. Besides medication-related salivary hypofunction, Sjögren syndrome and head-and-neck radiation are two common etiologies that have garnered considerable attention. Approaches to treating and/or preventing salivary hypofunction in patients with these conditions will likely incorporate gene therapy, stem cell therapy, and tissue engineering. Advances in these disciplines are central to current research in the cure for xerostomia and will be key to eventual treatment. Copyright © 2016 Elsevier Inc. All rights reserved.

  3. Evaluator Competencies: What's Taught versus What's Sought

    Science.gov (United States)

    Dewey, Jennifer D.; Montrosse, Bianca E.; Schroter, Daniela C.; Sullins, Carolyn D.; Mattox, John R., II

    2008-01-01

    This article explores the overlaps and disconnects between the competencies evaluators acquire during graduate school and those required and desired by employers. To investigate this relationship, two different surveys are administered, one for job seekers and the other for employers; 205 postings in the American Evaluation Association job bank…

  4. Gratifications Sought and Obtained: Model Specification and Theoretical Development.

    Science.gov (United States)

    Wenner, Lawrence A.

    Uses of the gratifications sought and gratifications obtained distinction in explanations of media effects have taken two conceptually distinct forms. The discrepancy approach poses that the difference between what is sought and what is actually obtained, expressed effectively as a discrepancy score, significantly aids effects explanations. The…

  5. Current Care and Investigational Therapies in Achondroplasia.

    Science.gov (United States)

    Unger, Sheila; Bonafé, Luisa; Gouze, Elvire

    2017-04-01

    The goal of this review is to evaluate the management options for achondroplasia, the most common non-lethal skeletal dysplasia. This disease is characterized by short stature and a variety of complications, some of which can be quite severe. Despite several attempts to standardize care, there is still no widely accepted consensus. This is in part due to absence of concrete data on the incidence of sudden unexplained death in infants with achondroplasia and the best investigation for ascertaining which individuals could benefit from foramen magnum decompression surgery. In this review, we identify the different options of care and management for the various orthopedic, neurologic, and respiratory complications. In parallel, several innovative or drug repositioning therapies are being investigated that would restore bone growth but may also prevent complications. Achondroplasia is the most common non-lethal skeletal dysplasia. It is characterized by short stature and a variety of complications, some of which can be quite severe. Despite several attempts to standardize care, there is still no widely accepted consensus. This is in part due to absence of concrete data on the incidence of sudden unexplained death in infants with achondroplasia and the best investigation for ascertaining which individuals could benefit from foramen magnum decompression surgery. In this review, we identify the different options of care and management for the various orthopedic, neurologic, and respiratory complications. In parallel, several innovative or drug repositioning therapies are being investigated that would restore bone growth but may also prevent complications.

  6. INVESTIGATION OF BLOCKING ALGORITHM FOR TRANSFORMER CURRENT PROTECTIONS IN MAGNETIZING INRUSH CURRENT MODES

    Directory of Open Access Journals (Sweden)

    A. N. Kuzovlev

    2014-01-01

    Full Text Available Presents investigations on blocking  algorithm for transformer  current  protections  during magnetizing  inrush  current. The investigations have shown that the algorithm has high sensitivity and reliably determines magnetizing  inrush current modes.

  7. Experimental Setup for the Investigation of Superconducting Persistent Current

    Science.gov (United States)

    2015-09-01

    NOTES 14. ABSTRACT We report on a recent experimental setup for the investigation of the relaxation rate of the persistent current in an assembly of...at cryo-temperatures in magnetic field at time scale of seconds to hours. 15. SUBJECT TERMS persistent current, 2G HTS, coated conductor, relaxation ... activation . One unknown aspect is the variation of the coils’ position with temperature from room to cryogenic. A better design of the coils assembly

  8. Leadership in Distance Education: Qualities and Qualifications Sought by Higher Education Institutions

    Science.gov (United States)

    Nworie, John; Haughton, Noela; Oprandi, Stephanie

    2012-01-01

    This article presents the results of an investigation into the qualities and qualifications sought in distance education leaders by institutions of higher education in the United States. The researchers examined 191 distance education leadership position announcements posted by online sources between 1997 and 2010. Content analysis of these…

  9. Experimental investigation of current free double layers in helicon plasmas

    Energy Technology Data Exchange (ETDEWEB)

    Sahu, B. B. [Department of Applied Sciences and Humanities, Dronacharya College of Engineering, Gurgaon 123506 (India); Tarey, R. D. [Department of Physics, Indian Institute of Technology, New Delhi 110016 (India); Ganguli, A. [Centre for Energy Studies, Indian Institute of Technology, New Delhi 110016 (India)

    2014-02-15

    The paper presents investigations of current free double layer (CFDL) that forms in helicon plasmas. In contrast to the other work reporting on the same subject, in the present investigations the double layer (DL) forms in a mirror-like magnetic field topology. The RF compensated Langmuir probe measurements show multiple DLs, which are in connection with, the abrupt fall of densities along with potential drop of about 24 V and 18 V. The DLs strengths (e ΔV{sub p})/(k T{sub e}) are about 9.5 and 6, and the corresponding widths are about 6 and 5 D lengths. The potential drop is nearly equal to the thermal anisotropies between the two plasma regions forming the DL, which is present in the plateau region of mirror, unlike the earlier studies on the DL formation in the region of strong gradients in the magnetic field. Also, it presents a qualitative discussion on the mechanism of DL formation.

  10. Experimental Investigation of Turbulence Specifications of Turbidity Currents

    Directory of Open Access Journals (Sweden)

    B Firoozabadi

    2010-01-01

    Full Text Available The present study investigates the turbulence characteristic of turbidity current experimentally. The three-dimensional Acoustic-Doppler Velocimeter (ADV was used to measure the instantaneous velocity and characteristics of the turbulent flow. The experiments were conducted in a three-dimensional channel for different discharge flows, concentrations, and bed slopes. Results are expressed at various distances from the inlet, for all flow rates, slopes and concentrations as the distribution of turbulence energy, Reynolds stress and the turbulent intensity. It was concluded that the maximum turbulence intensity happens in both the interface and near the wall. Also, it was observed that the turbulence intensity reaches its minimum where maximum velocity occurs.

  11. Numeric Investigation of Brain Tumor Influence on the Current Distributions During Transcranial Direct Current Stimulation.

    Science.gov (United States)

    Song, Bo; Wen, Peng; Ahfock, Tony; Li, Yan

    2016-01-01

    This study constructed a series of high-resolution realistic human-head models with brain tumors, and numerically investigated the influence of brain tumor's location and grade on the current distributions, under different electrode montages during tDCS. The threshold area and the peak current density were also derived and analyzed in the region of interest. The simulation result showed that it is safe to apply tDCS on the patients with brain tumors to treat their neuropsychiatric conditions and cancer pain caused by the tumor; although considerable changes of the current distributions are induced by the presence of a brain tumor. In addition, several observations on the global and local influences of tumor grade and possible edema have been made as well. These findings should be helpful for researchers and clinical doctors to treat patients with brain tumors. This study is also the first numerical study to fill in the gap of tDCS applications on the patients with brain tumors.

  12. Current investigations into carbon nanotubes for biomedical application

    Energy Technology Data Exchange (ETDEWEB)

    Li Xiaoming; Fan Yubo [Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, School of Biological Science and Medical Engineering, Beihang University, Beijing 100191 (China); Watari, Fumio, E-mail: x.m.li@hotmail.co [Department of Biomedical Materials and Engineering, Graduate School of Dental Medicine, Hokkaido University, Sapporo 060-8586 (Japan)

    2010-04-15

    The nano-dimensionality of nature has logically given rise to the interest in using nanomaterials in the biomedical field. Currently, a lot of investigations into carbon nanotubes (CNTs), as one of the typical nanomaterials, are being made for biomedical application. In this review, five parts, such as cellular functions induced by CNTs, apatite formation on CNTs, CNT-based tissue engineering scaffold, functionalized CNTs for the delivery of genes and drugs and CNT-based biosensors, are stated, which might indicate that CNTs, with a range of unique properties, appear suited as a biomaterial and may become a useful tool for tissue engineering. However, everything has two parts and CNTs is not an exception. There are still concerns about cytotoxicity and biodegradation of CNTs. Chemical fictionalization may be one of the effective ways to improve the 'disadvantages' and utilize the 'advantages' of CNTs. One of their 'disadvantages', unbiodegradable property, may be utilized by creating monitors in in vivo-engineered tissues or nanosized CNT-based biosensors. Other promising research points, for example proteins adsorbed on CNTs, use of CNTs in combination with other biomaterials to achieve the goals of tissue engineering, mineralization of CNTs and standard toxicological tests for CNTs, are also described in the conclusion and perspectives part. (topical review)

  13. Investigation of casing inspection through tubing with pulsed eddy current

    Science.gov (United States)

    Fu, Yuewen; Yu, Runqiao; Peng, Xuewen; Ren, Shangkun

    2012-12-01

    Corrosion and cracks of casing string in oil wells is a serious problem on which little research has been done when inspecting casing through tubing. In this study, inspecting casing through tubing with pulsed eddy current is investigated. Longitudinal and transverse probes are centred inside the tubing to detect wall thinnings and cracks in casing. A time slice of induced voltage in the receiving coil of the probe is used as the feature to recognise defects. The experimental results show that large area wall thinnings and long cracks in casing are detected successfully through the tubing with appropriate inspection parameters. The probe's orientation to the crack is important and a particular discovery is that the transverse probe should be parallel to the transverse crack and not be perpendicular to it when inspecting. A method based on linear regression is proposed to estimate flaws in casing while wall thinning in the tubing occurs at the same location. The method is effective for large area thinning in casing when tubing thinning is wide.

  14. Investigation of Si(001) stable surfaces in alternating current heating

    Science.gov (United States)

    Doi, T.; Koguchi, M.

    2016-11-01

    The topography of a Si(001) vicinal surface is investigated using reflection electron microscopy (REM) during alternating current (AC) heating of the surface in ultra-high vacuum. The normal direction of the surface is slightly tilted from the [001] direction at θx or θy on the x or y axis (they are orthogonal directions in the Si(001) surface), and the average widths of the terraces (a or b in x or y axis) are determined by θx or θy; the direction perpendicular to the incidence electron beam on the surface is selected as the x (horizontal) axis in each REM image. Alternating current heating changes each initial surface from stable to double-domain (DD), in which 2 × 1 and 1 × 2 terraces are arranged regularly with approximately equal width, at its transition temperature Tc; the dimer rows are parallel to the x or y axis in the 1 × 2 or 2 × 1 terraces. There are two types of stable surfaces in the vicinal surface. At temperatures below its Tc, the surface with horizontally (vertically) long terraces, where b a), changes to a 2 × 1 (1 × 2) surface with wide 2 × 1 (1 × 2) and narrow 1 × 2 (2 × 1) terraces. The terrace, the short side of which is parallel to its dimer row direction, grows to create a stable surface by thermal diffusion of Si atoms at temperatures below Tc. During AC heating, thermal diffusion plays a key role in analyzing the kinetics of the atoms on the surface because the thermal effect acts as the driving force for the atoms that have not yet evaporated from the surface. Then, by evaporating atoms from the vicinal surface, AC heating creates a DD surface at temperatures between its Tc and 1100 °C and a rugged surface consisting of small 2 × 1 and 1 × 2 terraces at temperatures above 1100 °C.

  15. New Titan Saltation Threshold Experiments: Investigating Current and Past Climates

    Science.gov (United States)

    Bridges, N.; Burr, D. M.; Marshall, J.; Smith, J. K.; Emery, J. P.; Horst, S. M.; Nield, E.; Yu, X.

    2015-12-01

    Titan exhibits aeolian sand dunes that cover ~20% of its surface, attesting to significant sediment transport by the wind. Recent experiments in the Titan Wind Tunnel (TWT) at NASA Ames Research Center [1,2] found that the threshold friction speed needed to detach Titanian "sand" is about 50% higher than previous estimates based on theory alone [3], a result that might be explained by the low ratio of particle to fluid density on the body [1]. Following the successful completion of the initial Titan threshold tests, we are conducting new experiments that expand the pressure range above and below current Titan values. The basic experimental techniques are described in [1], with minor updates to the instrumentation as described in [2]. To reproduce the kinematic viscosity and particle friction Reynolds number equivalent to that expected for Titan's nitrogen atmosphere at 1.4 bars and 94 K requires that TWT be pressurized to 12.5 bars for air at 293K. In addition to running experiments at this pressure to reproduce previous results [1] and investigate low density (high density ratio) materials, TWT pressures of 3 and 8 bars are in the experimental matrix to understand threshold under past Titan conditions when the atmospheric pressure may have been lower [4]. Higher pressures, at 15 and 20 bars in TWT, are also being run to understand the putative effects of low density ratio conditions. Our experimental matrix for this follow-on work uses some of the same materials as previously used, including walnut shells, basalt, quartz, glass spheres, and various low density materials to better simulate the gravity-equivalent weight of Titan sand. For these experiments, the TWT is now equipped with a new high pressure Tavis transducer with sufficient sensitivity to measure freestream speeds of less than 0.5 m s-1 at 12.5 bars. New techniques include video documentation of the experiments. We are also investigating methods of measuring humidity of the wind tunnel environment and

  16. Investigation on a new inducer of pulsed eddy current thermography

    Science.gov (United States)

    He, Min; Zhang, Laibin; Zheng, Wenpei; Feng, Yijing

    2016-09-01

    In this paper, a new inducer of pulsed eddy current thermography (PECT) is presented. The use of the inducer can help avoid the problem of blocking the infrared (IR) camera's view in eddy current thermography technique. The inducer can also provide even heating of the test specimen. This paper is concerned with the temperature distribution law around the crack on a specimen when utilizing the new inducer. Firstly, relative mathematical models are provided. In the following section, eddy current distribution and temperature distribution around the crack are studied using the numerical simulation method. The best separation distance between the inducer and the specimen is also determined. Then, results of temperature distribution around the crack stimulated by the inducer are gained by experiments. Effect of current value on temperature rise is studied as well in the experiments. Based on temperature data, temperature features of the crack are discussed.

  17. Investigation on a new inducer of pulsed eddy current thermography

    Directory of Open Access Journals (Sweden)

    Min He

    2016-09-01

    Full Text Available In this paper, a new inducer of pulsed eddy current thermography (PECT is presented. The use of the inducer can help avoid the problem of blocking the infrared (IR camera’s view in eddy current thermography technique. The inducer can also provide even heating of the test specimen. This paper is concerned with the temperature distribution law around the crack on a specimen when utilizing the new inducer. Firstly, relative mathematical models are provided. In the following section, eddy current distribution and temperature distribution around the crack are studied using the numerical simulation method. The best separation distance between the inducer and the specimen is also determined. Then, results of temperature distribution around the crack stimulated by the inducer are gained by experiments. Effect of current value on temperature rise is studied as well in the experiments. Based on temperature data, temperature features of the crack are discussed.

  18. A Preliminary Investigation of Current Practices in American Youth Theatres.

    Science.gov (United States)

    Regan, F. Scott

    1983-01-01

    Summarizes results of a survey of youth theatres on (1) theatre goals; (2) staff training and courses offered; (3) organization and funds; and (4) teachers' knowledge of actor training, child and adolescent psychology, playwriting trends in children's theatre, and current theoretical writings. (PD)

  19. Current investigation and management of patients with syncope

    DEFF Research Database (Denmark)

    Dagres, Nikolaos; Bongiorni, Maria Grazia; Dobreanu, Dan

    2013-01-01

    for neurally mediated syncope. Physical manoeuvres were the most widely (93%) applied standard treatment for this syncope form. The results of this survey suggest that there are significant differences in the management of patients with syncope across Europe, specifically with respect to hospitalization rates......The aim of this European Heart Rhythm Association (EHRA) survey was to provide an insight into the current practice of work-up and management of patients with syncope among members of the EHRA electrophysiology research network. Responses were received from 43 centres. The majority of respondents...... (74%) had no specific syncope unit and only 42% used a standardized assessment protocol or algorithm. Hospitalization rates varied from 10% to 25% (56% of the centres) to >50% (21% of the centres). The leading reasons for hospitalization were features suggesting arrhythmogenic syncope (85...

  20. Current investigations into magnetic nanoparticles for biomedical applications.

    Science.gov (United States)

    Li, Xiaoming; Wei, Jianrong; Aifantis, Katerina E; Fan, Yubo; Feng, Qingling; Cui, Fu-Zhai; Watari, Fumio

    2016-05-01

    It is generally recognized that nanoparticles possess unique physicochemical properties that are largely different from those of conventional materials, specifically the electromagnetic properties of magnetic nanoparticles (MNPs). These properties have attracted many researchers to launch investigations into their potential biomedical applications, which have been reviewed in this article. First, common types of MNPs were briefly introduced. Then, the biomedical applications of MNPs were reviewed in seven parts: magnetic resonance imaging (MRI), cancer therapy, the delivery of drugs and genes, bone and dental repair, tissue engineering, biosensors, and in other aspects, which indicated that MNPs possess great potentials for many kinds of biomedical applications due to their unique properties. Although lots of achievements have been obtained, there is still a lot of work to do. New synthesis techniques and methods are still needed to develop the MNPs with satisfactory biocompatibility. More effective methods need to be exploited to prepare MNPs-based composites with fine microstructures and high biomedical performances. Other promising research points include the development of more appropriate techniques of experiments both in vitro and in vivo to detect and analyze the biocompatibility and cytotoxicity of MNPs and understand the possible influencing mechanism of the two properties. More comprehensive investigations into the diagnostic and therapeutic applications of composites containing MNPs with "core-shell" structure and deeper understanding and further study into the properties of MNPs to reveal their new biomedical applications, are also described in the conclusion and perspectives part.

  1. Investigation of heavy current discharges with high initial gas density

    Energy Technology Data Exchange (ETDEWEB)

    Budin, A.; Bogomaz, A.; Kolikov, V.; Kuprin, A.; Leontiev, V.; Rutberg, P.; Shirokov, N. [Institute of Problems of Electrophysics of Russian Academy of Sciences, Dvortsovayanab., 18, St. Petersburg, 191065 (Russia)

    1996-05-01

    Piezoelectric pressure transducers, with noise immunity and time resolution of 0,5 {mu}s were used to measure pulse pressures of 430 MPa along the axis of an electrical discharge channel. Initial concentration of He was 2,7{center_dot}10{sup 21}cm{sup {minus}3}, dI/dt=6{center_dot}10{sup 11}A/s, and I{sub max}=560kA. Shock waves with amplitudes exceeding the pressure along the axis, were detected by a pressure transducer on the wall of the discharge chamber. Typical shock velocities were 2{center_dot}4km/s. Average pressure measurements along the discharge axis at different radii were used to estimate the current density distribution along the canal radius. The presence of the shock waves, promoting the additional hydrogen heating in the discharge chamber, has been registered during the discharge in hydrogen for I{sub max}{approximately}1MA and an initial concentration of 10{sup 21}cm{sup {minus}3}. {copyright} {ital 1996 American Institute of Physics.}

  2. 24 CFR 103.320 - Provisions sought for the public interest.

    Science.gov (United States)

    2010-04-01

    ... the public interest. The following are types of provisions may be sought for the vindication of the public interest: (a) Elimination of discriminatory housing practices. (b) Prevention of future... 24 Housing and Urban Development 1 2010-04-01 2010-04-01 false Provisions sought for the...

  3. Walden Pond, Massachusetts: Environmental Setting and Current Investigations

    Science.gov (United States)

    Colman, John A.; Waldron, Marcus C.

    1998-01-01

    as plant nutrients, organic matter, and soil are leached and eroded from the surrounding watershed. This process is known as eutrophication. The term 'cultural eutrophication' refers to an accelerated form of the natural process in which extra soil and nutrients are derived from people's use of fertilizer, rerouting of surface drainage, and disposal of domestic and industrial waste. Cultural eutrophication can lead to excessive growth of aquatic plants, pond filling by decayed plants and eroded soils, reduced water clarity, and depletion of dissolved oxygen in deep water with subsequent loss of cold-water fish habitat. In order to document the longterm ecological health of Walden Pond, the U.S. Geological Survey (USGS), working in cooperation with the Massachusetts Department of Environmental Management (MDEM), is investigating factors that could contribute to cultural eutrophication of Walden. Through measurements of mass balance of nutrients and oxygen in the pond's deep water, the investigation will establish a baseline data set on Walden's trophic state, which is a measure of the pond's ability to support plant growth. The baseline data will be used to detect trends and give early warning of trophic changes or trophic response to pond remediation projects. This Fact Sheet provides background information on the environmental setting, limnological features, and cultural eutrophication of Walden Pond, and describes the joint USGS/MDEM study.

  4. Investigating the current methods of assessing behavioral and psychological symptoms in residential aged care facilities in a metropolitan city.

    Science.gov (United States)

    Loi, Samantha M; Lautenschlager, Nicola T

    2017-05-01

    Up to 90% of people with dementia living in residential aged care facilities (RACFs) display behavioral and psychological symptoms of dementia (BPSD), and these are associated with poorer quality of life and increased morbidity and mortality. In order to implement appropriate interventions, it is important to understand the symptoms in more detail. Despite the availability of BPSD assessment tools, it is unknown what the current practice of monitoring of BPSD in RACFs. We sought to investigate the current BPSD assessment tools being used in RACFs and explore different stakeholders' views on current practices. A cross-sectional convenience sample of 21 clinicians were identified and administered a questionnaire. Old age psychiatrists, aged psychiatry clinicians, behavior management teams and RACF staff completed the questionnaires. Clinicians reported that objective consistent information about BPSD were important for recommending and implementing pharmacological and non-pharmacological strategies for BPSD; however, the use of validated BPSD assessments in RACFs was not a usual part of clinical practice. RACF staff stated the major barrier to assessment of BPSD was lack of time. Alternate methods of assessing BPSD which consider preferences from clinicians and RACF staff should be further investigated. Modern technology which can allow "real time" assessment may be a solution.

  5. INVESTIGATION OF MICROPROCESSOR TRANSFORMER CURRENT PROTECTION IN SHORT CIRCUIT FAULT MODES

    Directory of Open Access Journals (Sweden)

    M. S. Loman

    2014-01-01

    Full Text Available The paper presents an investigation on transformer current protection with blocking against magnetizing inrush current in short circuit fault modes. It has been shown that the proposed magnetizing in-rush current blocking algorithm can be implemented in microprocessor current protections of transformers.

  6. The Investigators' Brochure: a comparison of the draft international conference on harmonisation guideline with current Food and Drug Administration requirements.

    Science.gov (United States)

    Cocchetto, D M

    1995-12-01

    For several years, the United States Food and Drug Administration (FDA) has participated in a collaborative effort to harmonize the technical procedures for development and regulatory approval of human pharmaceuticals in multiple countries. This harmonization effort is the work of the International Conference on Harmonisation of Technical Requirements for Registration of Pharmaceuticals for Human Use (ICH). At this point, ICH focuses on achieving harmonization of technical requirements in three major regions of the world, i.e., the United States, European Union, and Japan. One area for which harmonization is being sought is the format and content of the Investigators' Brochure. On October 27, 1993, the ICH Steering Committee agreed that the ICH draft guideline on the Investigators' Brochure should be made available for public comment. On August 9, 1994, the FDA published the draft guideline for the format and content of the Investigators' Brochure. This draft guideline was prepared by the Efficacy Expert Working Group of the ICH. FDA solicited written comments on this draft guideline until October 11, 1994. Ultimately, FDA intends to adopt the ICH Steering Committee's final guidelines on Investigators' Brochures as part of a larger document on good clinical practices. Therefore, the content of this draft guideline warrants careful attention. In this paper, ICH's proposed information for inclusion in the Investigators' Brochure is reviewed and compared with current regulatory requirements of FDA. The expanded contents of the Investigators' Brochure proposed by ICH, which represent potential new requirements beyond current FDA regulations, are highlighted. The major controversial elements of this draft guideline are summarized.

  7. Teaching and Learning English Functional Writing: Investigating Egyptian EFL Student Teachers' Currently-Needed Functional Writing Skills

    Science.gov (United States)

    Abdallah, Mahmoud M. S.

    2014-01-01

    At an age marked by the emergence of new literacies, vast technological developments, and social networking practices, language is currently approached from a pragmatic perspective that recognises its functional use to meet realistic communicative goals. Taking this into account, the present study sought to identify the functional writing skills…

  8. The investigation of reverse traction current influence on tone track circuit modes

    Directory of Open Access Journals (Sweden)

    E.I.Jasсhuk

    2012-12-01

    Full Text Available Introduction: With the introduction of high-speed traffic there is an increased consumption of traction current by new types of rolling stock. This issue is important, as high levels of traction currents can have not only prevents, but also a dangerous impact on the equipment of railway automation devices. It is necessary to investigate the propagation of traction currents and potentials along the rails. Objective: Investigate the propagation of traction currents and potentials along the rails, the determination of critical currents, which not executed tone track circuits modes. Methods: In order to investigate the mathematical model, and the method of calculation tone track circuits modes was used. Results: By means of mathematical model, which includes being several rolling-stocks at the feeder zone, different rail resistance and isolation, the diagrams of currents and potentials propagations for DC and AC electric traction have been obtained. A comparative analysis of the experimental data and the results of the investigation has been realized. Based on received levels of reverse traction current their influence on track circuit modes has been investigated. Conclusions: The reverse traction current level near the substation and rolling-stock can be more than 600A. Great reverse traction current levels have an influence on tonal track circuit functioning, namely normal and shunt modes. When the traction current arrives 200 A there is a reduction criteria of tonal track circuits.

  9. 77 FR 9653 - Comment Sought on Potential Data for Connect America Fund Phase One Incremental Support

    Science.gov (United States)

    2012-02-17

    ... COMMISSION Comment Sought on Potential Data for Connect America Fund Phase One Incremental Support AGENCY... incremental support. DATES: Comments are due on or before March 19, 2012. ADDRESSES: Interested parties may... incremental support is designed to provide an immediate boost to broadband deployment in areas that are...

  10. 78 FR 42034 - More Data Sought on Extra Fees Levied on Inmate Calling Services

    Science.gov (United States)

    2013-07-15

    ... COMMISSION 47 CFR Part 64 More Data Sought on Extra Fees Levied on Inmate Calling Services AGENCY: Federal... (Bureau) seeks additional comment on certain fees related to inmate calling services (ICS). The record to... raised in the Rates for Interstate Inmate Calling Services NPRM that is intended to refresh the record...

  11. Preferred sources of health information in persons with multiple sclerosis: degree of trust and information sought.

    Science.gov (United States)

    Marrie, Ruth Ann; Salter, Amber R; Tyry, Tuula; Fox, Robert J; Cutter, Gary R

    2013-03-17

    Effective health communication is important for informed decision-making, yet little is known about the range of information sources used by persons with multiple sclerosis (MS), the perceived trust in those information sources, or how this might vary according to patient characteristics. We aimed to investigate the sources of health information used by persons with MS, their preferences for the source of health information, and levels of trust in those information sources. We also aimed to evaluate how these findings varied according to participant characteristics. In 2011, participants in the North American Research Committee on Multiple Sclerosis (NARCOMS) Registry were asked about their sources of health information using selected questions adapted from the 2007 Health Information National Trends (HINTS) survey. Of 12,974 eligible participants, 66.18% (8586/12,974) completed the questionnaire. Mass media sources, rather than interpersonal information sources, were the first sources used by 83.22% (5953/7153) of participants for general health topics and by 68.31% (5026/7357) of participants for MS concerns. Specifically, the Internet was the first source of health information for general health issues (5332/7267, 73.40%) and MS (4369/7376, 59.23%). In a logistic regression model, younger age, less disability, and higher annual income were independently associated with increased odds of use of mass media rather than interpersonal sources of information first. The most trusted information source was a physician, with 97.94% (8318/8493) reporting that they trusted a physician some or a lot. Information sought included treatment for MS (4470/5663, 78.93%), general information about MS (3378/5405, 62.50%), paying for medical care (1096/4282, 25.59%), where to get medical care (787/4282, 18.38%), and supports for coping with MS (2775/5031, 55.16%). Nearly 40% (2998/7521) of participants had concerns about the quality of the information they gathered. Although

  12. Investigation and Analysis of Current Writing Teaching Mode among English Majors in Normal Universities in China

    Science.gov (United States)

    Zeng, Hang-li

    2010-01-01

    This paper has made an investigation on the current writing teaching mode among English majors in normal universities in China, by means of questionnaire, interview and class observation. The study finds out that the current writing teaching mode is not purely product approach or process approach. In fact, the two approaches to writing co-exist in…

  13. Is erythroferrone finally the long sought-after systemic erythroid regulator of iron?

    Institute of Scientific and Technical Information of China (English)

    Alfons; Lawen

    2015-01-01

    Iron metabolism is regulated on the cellular and the systemic level. Over the last decade, the liver peptide "hepcidin" has emerged as the body’s key irons store regulator. The long postulated "erythroid regulator of iron", however, remained elusive. Last year, evidence was provided, that a previously described myokine "myonectin" may also function as the long sought erythroid regulator of iron. Myonectin was therefore renamed "erythroferrone". This editorial provides a brief discussion on the two functions of erythroferrone and also briefly considers the emerging potential role of transferrin receptor 2 in erythropoiesis.

  14. Comprehensive Investigation on Current Imbalance among Parallel Chips inside MW-Scale IGBT Power Modules

    DEFF Research Database (Denmark)

    Wu, Rui; Smirnova, Liudmila; Wang, Huai

    2015-01-01

    With the demands for increasing the power rating and improving reliability level of the high power IGBT modules, there are further needs of understanding how to achieve stable paralleling and identical current sharing between the chips. This paper investigates the stray parameters imbalance among...... parallel chips inside the 1.7 kV/1 kA high power IGBT modules at different frequencies by Ansys Q3D parastics extractor. The resulted current imbalance is further confirmed by experimental measurement....

  15. THEORETICAL INVESTIGATION ON BY-ONLY-CURRENT ELECTROMAGNETIC SEPARATION OF INCLUSION FROM MOLTEN METALS

    Institute of Scientific and Technical Information of China (English)

    B.W. Zhang; Z.M. Ren; Y.B. Zhong; K. Deng; K.D. Xu

    2002-01-01

    The electromagnetic field under applied AC and DC current in round and rectangularpipe was systematically investigated, then a concept of "equivalent current density"was proposed for evaluating the inhomogeneous electromagnetic pinch force, and themono-component removal efficiency and the overall removal efficiency of inclusionwere formulated. It is founded that flat pipe is superior to round pipe for the electro-magnetic removal of inclusion, and DC current can get a higher removal efficiencythan AC current due to absence of skin phenomenon. Under usual condition, a re-moval efficiency of 52% for 10μm inclusion or more than 92% for 20μm inclusioncan be achieved by imposing a current density of 3× 106A/m2 in a fiat pipe.

  16. Investigating the Impacts of Previous and Current Learning Experiences on Student Teachers' Teaching Experiences

    Science.gov (United States)

    Ögeyik, Muhlise Cosgun

    2016-01-01

    This study investigated the impacts of the previous and current learning experiences of the student teachers on their microteaching practices. The study pursued threefold research goals: to diagnose the microteaching stance, to treat it, and to explore and evaluate the progress. The participants were 24 undergraduate third year student teachers…

  17. Investigation of the Critical Current Density of YBaCuO high-temperature Superconductor Ceramic

    OpenAIRE

    METSKHVARISHVILI, I. R.; KEKELIDZE, N. P.; METSKHVARISHVILI, M. R.

    2002-01-01

    The method of high harmonics is used to investigate penetration of low magnetic fields within the Y1Ba2Cu3O7 high-temperature superconductor ceramic. Given experimental results are explained by the modal dependencies between the value of critical current density and the magnetic induction B: jc(B) = jc(0){\\frac{{B02}} {{B02 + B2}}}.

  18. Participation in a trauma-focused epidemiological investigation may result in sensitization for current health problems

    NARCIS (Netherlands)

    Verschuur, M.J.; Spinhoven, Ph.; van Emmerik, A.A.P.; Rosendaal, F.R.

    2008-01-01

    Objectives - Participation in health survey research may result in a worsening of self-assessed health status and enhanced service-use by increasing self-awareness of current health status. The present study investigated whether participation in a traumafocused epidemiological study sensitized parti

  19. What's Yours Is Mine: An Investigation of Current Copyright Policies of Education Journals

    Science.gov (United States)

    Meyer, Katrina A.

    2009-01-01

    This research investigated the current copyright policies of 21 education journals published by academic societies, universities and university presses, and commercial publishers. For the sample I chose only journals with a copyright policy on the journal or publisher web site, and I then analyzed the content of the policies in order to answer…

  20. Investigation of Leakage Current Waveforms Recorded in a Coastal High Voltage Substation

    Directory of Open Access Journals (Sweden)

    E. Thalassinakis

    2011-06-01

    Full Text Available Leakage current monitoring is a widely employed technique to monitor the performance of outdoor insulation. The evaluation of leakage current waveforms recorded in the field, offers significant information since insulation’s performance is strongly linked with local conditions, and the waveforms’ shape correlate to different types of surface activity. In this paper, an investigation of leakage current waveforms recorded in a 150 kV coastal Substations suffering which suffers intense marine pollution is presented. Investigation of the recorded waveforms verified the basic waveform shapes described in the literature. Further, several variations of the basic types and complex waveforms, as well as field related waveforms, are presented. The need for added categorization criteria in the case of field measurements is discussed.

  1. Experimental Investigation of a Direct Methanol Fuel Cell with Hilbert Fractal Current Collectors

    Directory of Open Access Journals (Sweden)

    Jing-Yi Chang

    2014-01-01

    Full Text Available The Hilbert curve is a continuous type of fractal space-filling curve. This fractal curve visits every point in a square grid with a size of 2×2, 4×4, or any other power of two. This paper presents Hilbert fractal curve application to direct methanol fuel cell (DMFC current collectors. The current collectors are carved following first, second, and third order Hilbert fractal curves. These curves give the current collectors different free open ratios and opening perimeters. We conducted an experimental investigation into DMFC performance as a function of the free open ratio and opening perimeter on the bipolar plates. Nyquist plots of the bipolar plates are made and compared using electrochemical impedance spectroscopy (EIS experiments to understand the phenomena in depth. The results obtained in this paper could be a good reference for future current collector design.

  2. An analytical investigation on singularity of current distribution around a crack in a long cylindrical superconductor

    Science.gov (United States)

    Xue, Feng; Zhou, You-He

    2010-06-01

    This paper presents an analytical investigation to display the distribution of critical current flow and trapped magnetic field around a through crack centrally located in a long cylindrical superconductor on the basis of the Bean model and the Kim model. After a simple conformal mapping is employed to the case of that the superconductor is fully penetrated, the current streamlines, the current density, and the trapped field around the crack in the superconductor without deformation are obtained. It is shown that the crack results in a long-range disturbance of J(r ) on the scale much larger than the crack length 2a and a large stagnation region of magnetic flux near the crack except for the singularity of the critical current at the crack tip. Meanwhile, it is also found that the singularity feature is different from the conventional stress one at the crack tip in a deformable body.

  3. CERN Press Release: CERN experiments observe particle consistent with long-sought Higgs boson

    CERN Multimedia

    2012-01-01

    Geneva, 4 July 2012. At a seminar held at CERN today as a curtain raiser to the year’s major particle physics conference, ICHEP2012 in Melbourne, the ATLAS and CMS experiments presented their latest preliminary results in the search for the long sought Higgs particle. Both experiments observe a new particle in the mass region around 125-126 GeV.   CERN physicists await the start of the Higgs seminar. “We observe in our data clear signs of a new particle, at the level of 5 sigma, in the mass region around 126 GeV. The outstanding performance of the LHC and ATLAS and the huge efforts of many people have brought us to this exciting stage,” said ATLAS experiment spokesperson Fabiola Gianotti, “but a little more time is needed to prepare these results for publication.” "The results are preliminary but the 5 sigma signal at around 125 GeV we’re seeing is dramatic. This is indeed a new particle. We know it must be a boson and it&...

  4. Simulation and investigation of SiPM’s leakage currents at low voltages

    Science.gov (United States)

    Parygin, P. P.; Popova, E. V.; Grachev, V. M.

    2017-01-01

    Technology Computer-Aided Design (TCAD) allows us to use computers in order to develop semiconductor processing technologies and devices and optimize them. Within a framework of a study of silicon photomultipliers (SiPM) a simulation of these devices has been made. The simulation was performed for the irradiated SiPMs and current-voltage characteristics were obtained for the modeled devices. Investigation of current-voltage curve below breakdown with regard to the simulated structure was performed. Obtained curves are presented.

  5. Principle and experimental investigation of current-driven negative-inductance superconducting quantum interference device

    Science.gov (United States)

    Li, Hao; Liu, Jianshe; Zhang, Yingshan; Cai, Han; Li, Gang; Liu, Qichun; Han, Siyuan; Chen, Wei

    2017-03-01

    A negative-inductance superconducting quantum interference device (nSQUID) is an adiabatic superconducting logic device with high energy efficiency, and therefore a promising building block for large-scale low-power superconducting computing. However, the principle of the nSQUID is not that straightforward and an nSQUID driven by voltage is vulnerable to common mode noise. We investigate a single nSQUID driven by current instead of voltage, and clarify the principle of the adiabatic transition of the current-driven nSQUID between different states. The basic logic operations of the current-driven nSQUID with proper parameters are simulated by WRspice. The corresponding circuit is fabricated with a 100 A cm‑2 Nb-based lift-off process, and the experimental results at low temperature confirm the basic logic operations as a gated buffer.

  6. Predictors of lost time from work among nursing personnel who sought treatment for back pain.

    Science.gov (United States)

    Pompeii, Lisa A; Lipscomb, Hester J; Dement, John M

    2010-01-01

    To examine possible predictors of lost workdays among nurses and nurses' aides who sought treatment for work-related back pain. Nursing staff employed at a tertiary care medical center over a 13-year time period (1994 through 2006). We used existing data from clinic surveys administered to nursing personnel during their initial treatment visit to the hospital's occupational health clinic. Predictors of losing ≤ 7 and ≥ 8 workdays was examined. 589 of 708 (83%) nursing personnel with complaints of work-related back pain completed the survey, with 31% resulting in lost workdays. Experiencing sudden onset of pain (RR:1.9; 95% CI: 1.1, 3.1), a combination of severe pain with numbness and tingling in the back/legs (RR: 7.4; 95% CI: 2.9, 18.6), severe pain only (RR: 4.4; 95% CI: 1.8, 11.1), numbness and tingling in the back/legs only (RR: 3.5; 95% CI: 1.0, 12.2), and working < 5 years at the hospital (RR: 2.3; 95% CI: 1.2, 4.7) were predictive of losing ≥ 8 workdays. Job title, work demands, work conflicts, and most psychosocial factors were not predictive. Severe pain, neurologic symptoms and sudden onset of pain were predictive of delayed return-to-work; however, these symptoms alone should not be considered indicators of poor outcomes given that most workers who reported these symptoms returned to work in less than 8~days. Among these health care workers, lost workdays appear to be related to more severe pathology rather than workplace characteristics.

  7. Serendipitous discovery of the long-sought active galactic nucleus in Arp 299-A

    Science.gov (United States)

    Pérez-Torres, M. A.; Alberdi, A.; Romero-Cañizales, C.; Bondi, M.

    2010-09-01

    Context. The dusty nuclear regions of luminous infra-red galaxies (LIRGs) are heated by either an intense burst of massive star formation, an active galactic nucleus (AGN), or a combination of both. Disentangling the contribution of each of those putative dust-heating agents is a challenging task, and direct imaging of the innermost few pc can only be accomplished at radio wavelengths, using very high-angular resolution observations. Aims: We observed the nucleus A of the interacting starburst galaxy Arp 299, using very long baseline interferometry (VLBI) radio observations at 1.7 and 5.0 GHz. Our aim was to characterize the compact sources in the innermost few pc region of Arp 299-A, as well as to detect recently exploded core-collapse supernovae. Methods: We used the European VLBI Network (EVN) to image the 1.7 and 5.0 GHz compact radio emission of the parsec-scale structure in the nucleus of Arp 299-A with milliarcsecond resolution. Results: Our EVN observations show that one of the compact VLBI sources, A1, previously detected at 5.0 GHz, has a flat spectrum between 1.7 and 5.0 GHz and is the brightest source at both frequencies. Our 1.7 GHz EVN image shows also diffuse, low-surface brightness emission extending westwards from A1 and displays a prominent core-jet structure. Conclusions: The morphology, radio luminosity, spectral index and ratio of radio-to-X-ray emission of the A1-A5 region is consistent with a low-luminosity AGN (LLAGN), and rules out the possibility that it is a chain of young radio supernovae (RSNe) and supernova remnants (SNRs). We therefore conclude that A1-A5 is the long-sought AGN in Arp 299-A. This finding may suggest that both starburst and AGN are frequently associated phenomena in mergers.

  8. Corrosion investigations, Tracy Red Bluff, California, and Boulder City, Nevada, ehv direct current tests

    Energy Technology Data Exchange (ETDEWEB)

    Backstrom, T.E.

    1965-01-01

    Evaluation of corrosion on buried metalwork, by the introduction of large direct currents into the ground, was studied during ehv dc transmission investigations in the Tracy-Red Bluff, California and the Boulder City, Nevada areas. Tests made on two types of electrodes showed that ehv dc ground return at test current levels would: (1) promote serious corrosion of buried metalwork within approximately 1/2-mile radius of the electrode with a ground mat electrode and mild corrosion with a deep-well electrode; (2) promote negligible-to-serious corrosion of buried pipelines within 1/2 to 3 mile radius of either a ground mat or deep-well electrode, depending on (a) distance of the pipelines from the electrode, (b) geometry of the two electrode-pipeline systems, and (c) horizontal extent of the pipelines; (3) impress negligible-to-mild corrosion of buried pipelines beyond a 3-mile radius of the electrode depending upon geometry of the electrode-pipeline system. Results show normal corrosion prevention techniques will be adequate to prevent corrosion of buried metalwork, if electrode is properly located. Use of ground return for only 8 to 24 hours per year on the ehv intertie, although with currents 2 to 3 times higher than test currents, will cause stray current damage of only a fraction of that expected with continuous operations.

  9. Laboratory Investigations of Current Sheets at the Electron Skin Depth Scale

    Science.gov (United States)

    Vincena, S.; Gekelman, W.

    2005-12-01

    Laboratory Investigations of Current Sheets at the Electron Skin Depth Scale. Theoretical investigations, in situ spacecraft and rocket missions, and laboratory studies form an essential triad for understanding the variety of current sheet phenomena found in space plasmas. In the Large Plasma Device (LAPD) at UCLA, the formation dynamics, equilibrium state, and wave-mediated disruptions of current sheets can be studied with great spatial and temporal resolution using a variety of probes as well as non-invasive laser induced fluorescence and other optical diagnostics. The LAPD is aptly suited for studying current sheets flowing in a magnetized background plasma which is capable of supporting Alfvén waves. The cylindrical device is 20m long and one meter in diameter with a solenoidal magnetic field as high as 3000 Gauss. For the parameters in this experiment, the plasma column is ten shear Alfvén wavelengths along the field and 100 electron inertial lengths (δe) (or 200 ρi) in the perpendicular direction. An electron current sheet is created in the plasma by placing a thin copper plate in the plasma column at one end of the device and pulsing this plate positive with respect to the chamber wall. The current sheet extends for the length of the device and has an initial cross-field size of roughly 45 δe by 0.5δe. A parallel flow of ions is observed with similar dimensions and moves in the same direction as the electrons in the current sheet with a velocity of 0.2 times the ion sound speed. A much weaker sheared perpendicular flow is also measured. Cross-sections of the ion flow are measured at several axial locations over a distance of six meters. Second, as the ion flow increases in magnitude, a much broader (8ρi) density depletion (n=0.25nO) develops around the flow. The gradient scale length of the depletion shortens until the spontaneous growth of drift waves occurs. This disrupts the electron current and ion flow, and leads to cross-field transport of

  10. Investigations on bipolar radio-frequency current application for interstitial thermotherapy (RF-ITT)

    Science.gov (United States)

    Desinger, Kai; Mueller, Gerhard J.; Stein, Thomas; Tschepe, Johannes

    1996-01-01

    This paper discusses the feasibility of radio-frequency current in bipolar technique for interstitial thermotherapy (rf-ITT). A short survey of established methods for interstitial tissue coagulation, e.g. the interstitial laser photocoagulation (ILP) and microwave exposure are given. In addition, a new concept for interstitial application of bipolar or quasi-bipolar radio- frequency alternating current is presented. Theoretical investigations of the electrical field distribution generated by a dipole model come together in the different mechanisms of heat generation by using radio-frequency alternating current. New concepts of bipolar or quasi- bipolar coaxial layered applicators are presented. This bipolar needle electrode enables the surgeon to use a partial and homogeneous exposure of radio-frequency current for interstitial thermotherapy, e.g. for the treatment of BPH or for concha coagulation in ENT. Less power is needed due to the limited current exposition at the immediate operation site and a highly safe procedure is possible. Therefore, to determine the thermal damage of tissue, depending on the rf parameters, a computer model for a real-time simulation of the spatial electrical field distribution especially for a multiple probe application is currently being developed. This is an appropriate tool for dosimetry. A similar program for LITT, called LITCIT, developed at the Laser-Medizin-Zentrum Berlin has already shown its efficiency in clinical use. Furthermore the feasibility of a 'cross-over' applicator is discussed which combines ILP and rf-application by using metallized optical fibers for a simultaneous application of electrical energy and laser radiation.

  11. Investigation of scaling properties of a thin current sheet by means of particle trajectories study

    CERN Document Server

    Sasunov, Yu L; Alexeev, I I; Belenkaya, E S; Semenov, V S; Kubyshkin, I V; Mingalev, O V

    2015-01-01

    A thin current sheet (TCS), with the width of an order of thermal proton gyroradius, appears a fundamental physical object which plays an important role in structuring of major magnetospheric current systems (magnetotail, magnetodisk, etc.). The TCSs are nowadays under extensive study by means of space missions and theoretical models. We consider a simple model of the TCS separating two half-spaces occupied by a homogenous magnetic field of opposite sign tangential to the TCS; a small normal component of the magnetic field is prescribed. An analytical solution for the electric current and plasma density in the close vicinity of the TCS has been obtained and compared with numerical simulation. The number density and the electric current profiles have two maxima each. The characteristic spatial scale $z_S$ of the maxima location was investigated as a function of initial pitch-angle of an incoming charge particle. The effect of the thermal dispersion of the incoming proton beam have been taken into consideration...

  12. Experimental Investigations on PV Powered SVM-DTC Induction Motor without AC Phase Current Sensors

    Directory of Open Access Journals (Sweden)

    T. Muthamizhan

    2014-05-01

    Full Text Available The paper presents a low-cost, phase-current reconstruction algorithm for space vector modulated direct torque controlled induction motor using the information obtained from only one shunt resistor which is in series with low side switches in a conventional three-phase inverter. The aim is to develop a low-cost high - performance induction motor drive. It uses the dc-link voltage and dc current to reconstruct the stator currents needed to estimate the motor flux and the electromagnetic torque. Photovoltaic arrays convert solar power to dc electric power; uses chopper and dc-ac inverter to fed three phase Induction Motor. The chopper used here is current fed full bridge boost dc-dc converter, which is preferred and extensively used in high voltage applications and advantageous over voltage fed converters. The inverter switches are controlled by PWM techniques obtained from SVM-DTC of IM. The experimental investigations are given to prove the ability of the proposed scheme of reproducing the performances of a SVM- DTC IM drive.

  13. Investigation of helium ion production in constricted direct current plasma ion source with layered-glows

    Energy Technology Data Exchange (ETDEWEB)

    Lee, Yuna [Department of Nuclear Engineering, Seoul National University, Seoul 151-744 (Korea, Republic of); Chung, Kyoung-Jae, E-mail: jkjlsh1@snu.ac.kr [Center for Advance Research in Fusion Reactor Engineering, Seoul National University, Seoul 151-744 (Korea, Republic of); Park, Yeong-Shin [Samsumg Electronics Co. Ltd., Gyeonggi 445-701 (Korea, Republic of); Hwang, Y. S. [Department of Nuclear Engineering, Seoul National University, Seoul 151-744 (Korea, Republic of); Center for Advance Research in Fusion Reactor Engineering, Seoul National University, Seoul 151-744 (Korea, Republic of)

    2014-02-15

    Generation of helium ions is experimentally investigated with a constricted direct current (DC) plasma ion source operated at layered-glow mode, in which electrons could be accelerated through multiple potential structures so as to generate helium ions including He{sup 2+} by successive ionization collisions in front of an extraction aperture. The helium discharge is sustained with the formation of a couple of stable layers and the plasma ball with high density is created near the extraction aperture at the operational pressure down to 0.6 Torr with concave cathodes. The ion beam current extracted with an extraction voltage of 5 kV is observed to be proportional to the discharge current and inversely proportional to the operating pressure, showing high current density of 130 mA/cm{sup 2} and power density of 0.52 mA/cm{sup 2}/W. He{sup 2+} ions, which were predicted to be able to exist due to multiple-layer potential structure, are not observed. Simple calculation on production of He{sup 2+} ions inside the plasma ball reveals that reduced operating pressure and increased cathode area will help to generate He{sup 2+} ions with the layered-glow DC discharge.

  14. Investigation of assumptions underlying current safety guidelines on EM-induced nerve stimulation

    Science.gov (United States)

    Neufeld, Esra; Vogiatzis Oikonomidis, Ioannis; Iacono, Maria Ida; Angelone, Leonardo M.; Kainz, Wolfgang; Kuster, Niels

    2016-06-01

    An intricate network of a variety of nerves is embedded within the complex anatomy of the human body. Although nerves are shielded from unwanted excitation, they can still be stimulated by external electromagnetic sources that induce strongly non-uniform field distributions. Current exposure safety standards designed to limit unwanted nerve stimulation are based on a series of explicit and implicit assumptions and simplifications. This paper demonstrates the applicability of functionalized anatomical phantoms with integrated coupled electromagnetic and neuronal dynamics solvers for investigating the impact of magnetic resonance exposure on nerve excitation within the full complexity of the human anatomy. The impact of neuronal dynamics models, temperature and local hot-spots, nerve trajectory and potential smoothing, anatomical inhomogeneity, and pulse duration on nerve stimulation was evaluated. As a result, multiple assumptions underlying current safety standards are questioned. It is demonstrated that coupled EM-neuronal dynamics modeling involving realistic anatomies is valuable to establish conservative safety criteria.

  15. EXPERIMENTAL INVESTIGATIONS ON DIFFUSION CHARACTERISTICS OF HIGH CONCENTRATION JETS IN ENVIRONMENTAL CURRENTS

    Institute of Scientific and Technical Information of China (English)

    张燕; 王道增; 樊靖郁

    2002-01-01

    By means of flow visualization and quantitative measurement, the diffusionpattern and concentration distribution characteristics of high concentration jets verticallydischarged into shallow moving waterbody were experimentally investigated in waterchannel. The interactions between the high concentration jets and environmental flowconditions were analysed, and the formulae of impinging point coordinate and transversespread angle are gained from data analysis. Experimental results indicate that the jets showcomplicated flow patterns and diffusion characteristics in near region, which are differentfrom common submerged jets, and spread downstream in the manner of density currents.

  16. An investigation into the lepton flavor changing neutral current at a Z-factory

    Institute of Scientific and Technical Information of China (English)

    2010-01-01

    The potential for detecting the lepton flavor changing neutral current (LFCNC) via the Z → eτ rare decay at a Z-factory is investigated.Practicable event selection strategies are designed to increase signal significance over SM contributions.Assuming no apparent deviation from SM predictions,one can conclude that the most general model-independent LFCNC effective form factors would be constrained at an unprecedent level,and accordingly a 3-order improvement from LEP1 measurements on the upper limit of BR(Z → eτ) could be achieved,as precisely as 10-8 with 100 fb-1 at Z-factory.

  17. Chosen Aspects Of Investigations Of Solar Cells With The Laser Beam Induced Current Technique

    Directory of Open Access Journals (Sweden)

    Chrobak Łukasz Bartłomiej

    2015-06-01

    Full Text Available This paper presents maps of spatial distributions of the short circuit current Isc(x,y and the open circuit voltage Uoc(x,y of the investigated low cost solar cells. Visible differences in values of these parameters were explained by differences in the serial and shunt resistances determined for different points of solar cells from measurements of I–V characteristics. The spectral dependence of the photo voltage of solar cell is also shown, discussed and interpreted in the model of amorphous and crystal silicon.

  18. Beam brilliance investigation of high current ion beams at GSI heavy ion accelerator facility

    Energy Technology Data Exchange (ETDEWEB)

    Adonin, A. A., E-mail: a.adonin@gsi.de; Hollinger, R. [Linac and Operations/Ion Sources, GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt (Germany)

    2014-02-15

    In this work the emittance measurements of high current Ta-beam provided by VARIS (Vacuum Arc Ion Source) ion source are presented. Beam brilliance as a function of beam aperture at various extraction conditions is investigated. Influence of electrostatic ion beam compression in post acceleration gap on the beam quality is discussed. Use of different extraction systems (single aperture, 7 holes, and 13 holes) in order to achieve more peaked beam core is considered. The possible ways to increase the beam brilliance are discussed.

  19. Sounding Rocket Experiments to Investigate Thermal Electron Heating in the Sq Current Focus

    Science.gov (United States)

    Abe, T.; Ishisaka, K.; Kumamoto, A.; Yoshikawa, A.; Takahashi, T.; Tanaka, M.

    2015-12-01

    Sounding rocket observations in the southern part of Japan suggest that the electron temperature profile occasionally exhibits the local increase by several hundred K at 100-110 km altitudes at 1100-1200 LT in winter. Detailed study of the temperature profiles indicates that such an increase is closely related to the existence of Sq current focus, because it becomes more significant when the measurement is made near the center of Sq focus. In order to understand a general feature of this unusual phenomena occurring in the Sq current focus, the sounding rocket experiment was conducted in Uchinoura of Japan. In this experiment, we launched "S-310-37" rocket equipped with a total of eight science instruments at 11:20 JST on January 16, 2007 after being convinced that the Sq current was approaching to the planned rocket trajectory. The geomagnetic activity had been successively quiet on that day so that we can estimate the position of Sq current focus. Our analysis of the obtained data indicates that the electron temperature was certainly increased by about 500-600 K at the altitude of 97-101 km with respect to the background. Strong electron density perturbation was also observed to exist above 97 km altitude, which corresponds to the lower boundary of the high electron temperatures. It is also noticeable that both the electric field and magnetic field data include unusual variation in the same altitude region as the temperature increase was observed, suggesting a possible connection between the thermal electron heating and variation of the electric and/or magnetic field. Thus, the first experiment in 2007 revealed a general feature of such unusual phenomena in the Sq current focus, and thereby our interest to the generation mechanism for increasing the electron temperature was more and more increased. We will conduct the second rocket experiment to investigate such unusual phenomena in the Sq current focus in January 2016. In this experiment, we will try to measure

  20. An exploration of the relationship between coronary artery bypass graft patients' self-sought educational resources and outcomes.

    Science.gov (United States)

    Fredericks, Suzanne; Sidani, Souraya

    2008-01-01

    Postoperative coronary artery bypass graft (CABG) patients seek educational resources around discharge. There is limited research on the type and perceived effectiveness of self-sought educational resources. The purpose of this study was to describe the use of self-sought educational resources by patients around time of discharge and to explore relationships between use of self-sought educational resources and self-care knowledge, performance of self-care behavior, and symptom frequency. This study is a substudy of a randomized clinical trial that included a convenience sample of first-time CABG patients. Significant correlations were found between use of self-sought educational resources and greater frequency of patient's behavior (P educational resources after CABG and outcomes expected of education.

  1. Investigation of the characteristics of GIDL current in 90nm CMOS technology

    Institute of Scientific and Technical Information of China (English)

    Chen Hai-Feng; Hao Yue; Ma Xiao-Hua; Zhang Jin-Cheng; Li Kang; Cao Yan-Rong; Zhang Jin-Feng; Zhou Peng-Ju

    2006-01-01

    A specially designed experiment is performed for investigating gate-induced drain leakage (GIDL) current in 90nm CMOS technology using lightly-doped drain (LDD) NMOSFET. This paper shows that the drain bias VD has a strong effect on GIDL current as compared with the gate bias VG at the same drain-gate voltage VDG-It is found that the difference between ID in the off-state ID-VG characteristics and the corresponding one in the off-state ID-VD characteristics, which is defined as /DIFF, versus VDG shows a peak. The difference between the influences of VD and VG on GIDL current is shown quantitatively by /DIFF, especially in 90nm scale. The difference is due to different hole tunnellings. Furthermore, the maximum /DIFF(IDIFF.MAX) varies linearly with VDG in logarithmic coordinates and also VDG at IDIFF.MAX with VF which is the characteristic voltage of /DIFF- The relations are studied and some related expressions are given.

  2. Investigating Effects of Nano- to Micro-Ampere Alternating Current Stimulation on Trichophyton rubrum Growth

    Science.gov (United States)

    Kwon, Dong Rak; Kwon, Hyunjung; Lee, Woo Ram

    2016-01-01

    Background Fungi are eukaryotic microorganisms including yeast and molds. Many studies have focused on modifying bacterial growth, but few on fungal growth. Microcurrent electricity may stimulate fungal growth. Objective This study aims to investigate effects of microcurrent electric stimulation on Trichophyton rubrum growth. Methods Standard-sized inoculums of T. rubrum derived from a spore suspension were applied to potato dextrose cornmeal agar (PDACC) plates, gently withdrawn with a sterile pipette, and were applied to twelve PDACC plates with a sterile spreader. Twelve Petri dishes were divided into four groups. The given amperage of electric current was 500 nA, 2 µA, and 4 µA in groups A, B, and C, respectively. No electric current was given in group D. Results In the first 48 hours, colonies only appeared in groups A and B (500 nA and 2 µA exposure). Colonies in group A (500 nA) were denser. Group C (4 µA) plates showed a barely visible film of fungus after 96 hours of incubation. Fungal growth became visible after 144 hours in the control group. Conclusion Lower intensities of electric current caused faster fungal growth within the amperage range used in this study. Based on these results, further studies with a larger sample size, various fungal species, and various intensities of electric stimulation should be conducted. PMID:27746636

  3. Experimental Investigation and Modelling for the Optimisation of Conduction Cooled HTS Hybrid Current Leads for SMES

    Institute of Scientific and Technical Information of China (English)

    2003-01-01

    It′s important that HTS tapes have lower thermal conductivity and higher transversal resistivity in order to reduce the heat leaks conducted along the tapes and AC losses in the high temperature superconducting system conduction-cooled by GM coolers. This paper presents an experimental investigation into the effects of pure Ag and AgAu alloys sheath materials on the properties of Bi(2223) multifilamentary tapes and the optimisation of conduction-cooled hybrid current leads made from copper and Bi(2223)/Ag or Bi(2223)/AgAu tapes. The thermal conductivity of the tapes were measured by cryogenic steady heat flux method and the resistance was measured by using standard DC four-probe method at low temperature. The results showed that the reduction of thermal conductivity by the addition of Au into the sheath material of Bi(2223) tapes was 650%, 750% and 850% lower than that of pure Ag sheathed Bi(2223) tapes and the increase of resistivity was 4.9, 10 and 19.4 times higher than that of pure Ag for the addition of 2.20%, 5.70% and 10.70%Au(atom ratio) respectively. And the study also attempts to optimise thermodynamically the conduction-cooled hybrid current lead by using a developed model, which took the irreversibility of commercial GM coolers, the contact resistance and thermal conductance into account. Predictions from the model showed that AgAu alloys were suitable candidate materials to replace Ag as sheath material of Bi(2223) tapes applied in HTS current leads. In addition, Bi(2223)/AgAu was a suitable material to be applied as the HTS section of hybrid current leads in conduction-cooled superconducting electric systems.

  4. Investigation of properties of human epidermal membrane under constant conductance alternating current iontophoresis.

    Science.gov (United States)

    Zhu, Honggang; Peck, Kendall D; Miller, David J; Liddell, Mark R; Yan, Guang; Higuchi, William I; Li, S Kevin

    2003-04-14

    Previous studies in our laboratory have shown that enhanced, constant permeant fluxes across human skin can be achieved by applying an alternating current (AC) to maintain skin electrical conductance at a constant level. Relative to conventional direct current (DC) iontophoresis, for which current is maintained at a constant level, this newly developed constant conductance alternating current (CCAC) method achieves constant fluxes with less inter- and intra-sample variability. The present study focused upon further investigating the permeability properties of human skin during CCAC iontophoresis at a variety of target resistance/conductance values. A three-stage experimental protocol was used with flux measurements determined on 3 consecutive days. Stage I was an AC only protocol (symmetrical AC square-wave signal), stage II was an AC plus DC protocol (AC square-wave with DC offset voltage), and stage III was a repeat of stage I. During this three-stage protocol, the skin electrical resistance was maintained at a constant target value by manually adjusting the applied AC voltage. Radiolabeled mannitol and urea were model permeants in all experiments. Their fluxes were determined and used to characterize the permeability properties of human skin. The results from the present study established that: (i) the CCAC protocol made it possible to reduce HEM electrical resistance to different target levels as low as 0.8 kOmega cm(2) and maintain the specific resistance level throughout the flux experiment, (ii) permeant fluxes are proportional to skin electrical conductance, (iii) under the studied CCAC passive conditions, membrane pore size tends to increase as skin resistance decreases, and (iv) as the membrane breaks down, its pore sizes become larger.

  5. 系外行星大气研究现状%Current Investigations on Exoplanetary Atmospheres

    Institute of Scientific and Technical Information of China (English)

    田蕾; 季江徽

    2015-01-01

    The ultimate goal for detecting exoplanets is to search for extraterrestrial life and habitable terrestrial planets. The exoplanetary atmosphere acts as a good window to understand exoplanet’s characteristics and habitability. Hence, such investigation is one of the most significant frontiers in astronomy. In the last decade, tremendous achievements have been made on the theories of the exoplanetary atmosphere, and observations through photometric and spectroscopic methods using a variety of space-borne and ground-based observational facilities. However, currently the atmosphere observations mainly come from transiting hot Jupiters, super-Earths and direct imaging giant planets, because of limitation in current observational techniques. The present review attempts to succinctly summarize current investigations in this field. First, we briefly describe the methods of observing exoplanetary atmospheres. Next, we review the fundamental facts, nowadays research progress of atmospheres for hot Jupiters and super-Earths. Finally,we present an introduction of the projects, which are involved in exoplanetary atmosphere detection to show the bright prospects for future investigation.%探测系外行星的最终目的是为了寻找系外生命和宜居行星,而系外行星大气是人们了解行星宜居特性的窗口,所以系外行星大气的研究至关重要。近10年来,系外行星大气的理论研究和观测都发展迅速。受观测技术限制,目前观测到大气的系外行星主要是用凌星法探测到的热木星和超级地球,还有用直接成像法探测到的离主星较远的年轻气态巨行星。力求在系外行星大气领域飞速发展之际,对该领域研究现状做简明介绍。首先介绍系外行星大气的观测方法,随后介绍热木星和超级地球的大气概况和研究现状,最后对系外行星大气探测的有关项目进行简要介绍,以展示未来系外行星大气研究的前景。

  6. The causal relationship between Foreign Direct Investment and Current Account: an empirical investigation for Pakistan economy

    Directory of Open Access Journals (Sweden)

    Muhammad ASIM

    2013-08-01

    Full Text Available This paper investigates relationship between FDI and current account (CA in Pakistan using the Johansen-Juselius cointegration technique and the Granger causality test. The study results indicate that FDI and CA are cointegrated and thus exhibit a reliable long run relationship. The Granger causality test findings indicate that the causality between FDI and CA is uni-directional. However, there is no short run causality from FDI to CA and vice versa. Therefore, as a policy implication that FDI inflows may cause to the deterioration of the balance of payments in the long run should be taken into account when policy makers decide to implement policies to attract foreign investors.

  7. An investigation of the role of current and future remote sensing data systems in numerical meteorology

    Science.gov (United States)

    Diak, George R.; Smith, William L.

    1993-01-01

    The goals of this research endeavor have been to develop a flexible and relatively complete framework for the investigation of current and future satellite data sources in numerical meteorology. In order to realistically model how satellite information might be used for these purposes, it is necessary that Observing System Simulation Experiments (OSSEs) be as complete as possible. It is therefore desirable that these experiments simulate in entirety the sequence of steps involved in bringing satellite information from the radiance level through product retrieval to a realistic analysis and forecast sequence. In this project we have worked to make this sequence realistic by synthesizing raw satellite data from surrogate atmospheres, deriving satellite products from these data and subsequently producing analyses and forecasts using the retrieved products. The accomplishments made in 1991 are presented. The emphasis was on examining atmospheric soundings and microphysical products which we expect to produce with the launch of the Advanced Microwave Sounding Unit (AMSU), slated for flight in mid 1994.

  8. Investigation of pulsed eddy current probes for detection of defects in riveted structures

    Science.gov (United States)

    Yang, Binfeng; Zhang, Hui; Kang, Zhibin; Wang, Xiaofeng

    2013-09-01

    The fatigue crack is the threat to integrity and safety of fuselage lap-joints. Quantification of fatigue cracks by designing and utilisation of an optimised electromagnetic nondestructive evaluation probe can insure the flight safety of aircrafts. In this paper, pulsed eddy current (PEC) for detection and characterisation of fatigue cracks is investigated. The principle of PEC is analysed first, from which four different models of PEC probes are simulated in ANSYS. The signal features, namely zero-crossing time, zero-crossing frequency and peak value are extracted from the time and frequency domains in an effort to qualitatively compare the crack detectability of the four models. The sensitivities of the different probes to cracks are analysed quantitatively. The difference in detectability among the probes is investigated based on the working principle. Simulation results show that the probe consisting of two horizontal detecting coils along with a magnetic field shield focusing the flux has the highest detectability. The conclusions derived from the simulation study are also validated by experiments.

  9. Investigation of Characteristics of Large dB/dt for Geomagnetically Induced Currents

    Science.gov (United States)

    Munoz, D.; Ngwira, C.; Damas, M. C.

    2016-12-01

    When geomagnetically induced currents (GICs) flow through electrical networks, they become a potential threat for electrical power systems. Changes in the geomagnetic field (dB/dt) during severe geomagnetic disturbances are the main sources of GICs. These dB/dt phenomena were studied by selecting 24 strong geomagnetic storms with Dst ≤ - 150 nT. ACE spacecraft solar wind data: flow speed, proton density, By and Bz IMF components of the solar wind were correlated with measurements of the magnetic field detected on ground stations at different latitudes. This article reports characteristics of the solar wind during time intervals of large changes in the horizontal geomagnetic field with a threshold of dB/dt ≥ ± 20 nT/min for the 24 geomagnetic storms. The results of this investigation can help scientists to understand the mechanisms responsible for causing large magnetic field variations in order to predict and mitigate possible large events in the future, which is critical for our society that relies constantly on electricity for livelihood and security. In addition, this ongoing project will continue to investigate electron flux response before, during, and after large changes in geomagnetic field.

  10. An Investigation on the Current Situation of Management Information Systems Discipline in Turkey

    Directory of Open Access Journals (Sweden)

    Serdar YARLIKAŞ

    2015-09-01

    Full Text Available The purpose of this research is to investigate the development of management information systems field by evaluating the theses conducted at universities in Turkey in the departments of management information systems and science of management information systems. First, this study aims to determine the distribution of the theses in terms of years, subjects and the research methods used. Another purpose of this study was to determine which of the related disciplines of management information systems are used most in the theses. In addition, as a result of the study, the compatibility degree between the theses written and the courses taught in the graduate programs of management information systems were determined. In this research, content analysis method is used. Through this method, each of the theses was evaluated with a 10-question ‘thesis evaluation question set' constructed towards the purpose of the study. Through this evaluation, the current situation of the field was determined. It was observed that the number of doctoral theses associated with the field was less. Using the combination of qualitative and quantitative techniques most in the theses denoted that the interdisciplinary approaches were adopted in the theses associated with management information systems. It was observed that the literature analysis and survey techniques were the most studied research methods in the theses. Besides, statistical techniques were used highly in the theses. As a result of this study, it was concluded that out of the associated disciplines of management information systems, management science, computer science and statistics disciplines were more associated with the investigated theses. When the study results were evaluated as a whole, it was seen that significant progress was made in the discipline of management information systems compared to the early 2000s.

  11. The Design of Servicescape Based on Benefit Sought in Hotel Facilities:A Survey Study of Hotel Consumers in Seoul

    National Research Council Canada - National Science Library

    Lee, Seung Hee; Lee, Hyunsoo

    2015-01-01

    ...′s needs, wants and expectations. The purpose of this study is to segment users by employing a cluster analysis based on benefit sought and to suggest a strategy for designing servicescape in hotel facilities adopting Bitner′s (1992...

  12. 77 FR 12055 - Comment Sought on Petition for Declaratory Ruling Interpreting the Definition of “Commercial...

    Science.gov (United States)

    2012-02-28

    ... Commission's rules and to find that it is not a provider of ``commercial mobile radio service'' (CMRS). DATES... does not provide ``commercial mobile radio service'' as defined under the Commission's rules... COMMISSION Comment Sought on Petition for Declaratory Ruling Interpreting the Definition of...

  13. Investigating the feasibility of using transcranial direct current stimulation to enhance fluency in people who stutter.

    Science.gov (United States)

    Chesters, Jennifer; Watkins, Kate E; Möttönen, Riikka

    2017-01-01

    Developmental stuttering is a disorder of speech fluency affecting 1% of the adult population. Long-term reductions in stuttering are difficult for adults to achieve with behavioural therapies. We investigated whether a single session of transcranial direct current stimulation (TDCS) could improve fluency in people who stutter (PWS). In separate sessions, either anodal TDCS (1mA for 20min) or sham stimulation was applied over the left inferior frontal cortex while PWS read sentences aloud. Fluency was induced during the stimulation period by using choral speech, that is, participants read in unison with another speaker. Stuttering frequency during sentence reading, paragraph reading and conversation was measured at baseline and at two outcome time points: immediately after the stimulation period and 1h later. Stuttering was reduced significantly at both outcome time points for the sentence-reading task, presumably due to practice, but not during the paragraph reading or conversation tasks. None of the outcome measures were significantly modulated by anodal TDCS. Although the results of this single-session study showed no significant TDCS-induced improvements in fluency, there were some indications that further research is warranted. We discuss factors that we believe may have obscured the expected positive effects of TDCS on fluency, such as heterogeneity in stuttering severity for the sample and variations across sessions. Consideration of such factors may inform future studies aimed at determining the potential of TDCS in the treatment of developmental stuttering. Copyright © 2016. Published by Elsevier Inc.

  14. Metabolic Investigation in Gluconacetobacter xylinus and Its Bacterial Cellulose Production under a Direct Current Electric Field.

    Science.gov (United States)

    Liu, Miao; Zhong, Cheng; Zhang, Yu Ming; Xu, Ze Ming; Qiao, Chang Sheng; Jia, Shi Ru

    2016-01-01

    The effects of a direct current (DC) electric field on the growth and metabolism of Gluconacetobacter xylinus were investigated in static culture. When a DC electric field at 10 mA was applied using platinum electrodes to the culture broth, bacterial cellulose (BC) production was promoted in 12 h but was inhibited in the last 12 h as compared to the control (without DC electric field). At the cathode, the presence of the hydrogen generated a strong reductive environment that is beneficial to cell growth. As compared to the control, the activities of glycolysis and tricarboxylic acid cycle, as well as BC productivity were observed to be slightly higher in the first 12 h. However, due to the absence of sufficient oxygen, lactic acid was accumulated from pyruvic acid at 18 h, which was not in favor of BC production. At the anode, DC inhibited cell growth in 6 h when compared to the control. The metabolic activity in G. xylinus was inhibited through the suppression of the tricarboxylic acid cycle and glycolysis. At 18-24 h, cell density was observed to decrease, which might be due to the electrolysis of water that significantly dropped the pH of cultural broth far beyond the optimal range. Meanwhile, metabolites for self-protection were accumulated, for instance proline, glutamic acid, gluconic acid, and fatty acids. Notably, the accumulation of gluconic acid and lactic acid made it a really tough acid stress to cells at the anode and finally led to depression of cell growth.

  15. Investigation of current status in Europe and USA on boron neutron capture therapy

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2000-11-01

    This report describes on the spot investigation results of current status of medical irradiation in Europe and USA at Feb. 1999. In HFR (Netherlands), the phase 1 study with the Joint Research Centre (JRC) of the EU had been already finished in those days, at the same time, an improvement of medical irradiation field of VTT(Finland) had been finishing and then clinical trial research had been about to start. On the other hand, phase 1 studies by two groups of BNL (Brook heaven National Laboratory) and MIT (Nuclear Engineering of Massachusetts Institute of Technology) in US were now in almost final stage, and they would start on phase 2 study. Either reactors of MIT and BNL were in modification to increase neutron flux, especially that employing fission converter into the irradiation facility and installation of irradiation room were carrying out in the former. In Europe and USA, the accelerator-based BNCT planes are now in progress vigorously, and will have reality. A reform of dynamitron accelerator at University of Birmingham was progressed, and the clinical treatment would be started from September 2000. The accelerator group at MIT has a small type of tandem accelerator, and they were performing basic experiment for BNCS (Boron Neutron Capture Synovectomy) with this accelerator. The concept design for an accelerator and a moderator had been finished at Lawrence Berkeley National Laboratory and University of Berkeley. (author)

  16. Investigation of Deep Dielectric Charging and Subsequent Currents on Geosynchronous Spacecraft

    Science.gov (United States)

    1991-12-01

    backscatter+ jh True ambient flux is all of the flux that surrounds the spacecraft. Ambient current density is current/unit area that comes from the ambient...We tacitly assume the currents are constant over the periods of integration. (5) Lnet= nambient +Jenergetic+Jsecondary+ Jbackscatter+ Jhv For the two

  17. Space trophy nominations sought

    Science.gov (United States)

    Showstack, Randy

    2011-10-01

    The Rotary National Award for Space Achievement (RNASA) Foundation is soliciting nominations for its 2012 trophy. The trophy recognizes an outstanding American who has made major contributions to the U.S. space program. Previous awardees include astronaut Neil Armstrong and President George H. W. Bush. Nominations are due by 6 November 2011. For more information, see http://www.rnasa.org/trophy.html or contact chairman@rnasa.org.

  18. The impact on CT dose of the variability in tube current modulation technology: a theoretical investigation

    Science.gov (United States)

    Li, Xiang; Segars, W. Paul; Samei, Ehsan

    2014-08-01

    Body CT scans are routinely performed using tube-current-modulation (TCM) technology. There is notable variability across CT manufacturers in terms of how TCM technology is implemented. Some manufacturers aim to provide uniform image noise across body regions and patient sizes, whereas others aim to provide lower noise for smaller patients. The purpose of this study was to conduct a theoretical investigation to understand how manufacturer-dependent TCM scheme affects organ dose, and to develop a generic approach for assessing organ dose across TCM schemes. The adult reference female extended cardiac-torso (XCAT) phantom was used for this study. A ray-tracing method was developed to calculate the attenuation of the phantom for a given projection angle based on phantom anatomy, CT system geometry, x-ray energy spectrum, and bowtie filter filtration. The tube current (mA) for a given projection angle was then calculated as a log-linear function of the attenuation along that projection. The slope of this function, termed modulation control strength, α, was varied from 0 to 1 to emulate the variability in TCM technology. Using a validated Monte Carlo program, organ dose was simulated for five α values (α = 0, 0.25, 0.5, 0.75, and 1) in the absence and presence of a realistic system mA limit. Organ dose was further normalized by volume-weighted CT dose index (CTDIvol) to obtain conversion factors (h factors) that are relatively independent of system specifics and scan parameters. For both chest and abdomen-pelvis scans and for 24 radiosensitive organs, organ dose conversion factors varied with α, following second-order polynomial equations. This result suggested the need for α-specific organ dose conversion factors (i.e., conversion factors specific to the modulation scheme used). On the other hand, across the full range of α values, organ dose in a TCM scan could be derived from the conversion factors established for a fixed-mA scan (hFIXED). This was possible by

  19. Metabolic investigation in Gluconacetobacter xylinus and its bacterial cellulose production under a direct current electric field

    Directory of Open Access Journals (Sweden)

    Miao eLiu

    2016-03-01

    Full Text Available The effects of a direct current (DC electric field on the growth and metabolism of Gluconacetobacter xylinus were investigated in static culture. When a DC electric field at 10 mA was applied using platinum electrodes to the culture broth, bacterial cellulose (BC production was promoted in 12 hours (h but was inhibited in the last 12 h as compared to the control (without DC electric field. At the cathode, the presence of the hydrogen generated a strong reductive environment that is beneficial to cell growth. As compared to the control, the activities of glycolysis and tricarboxylic acid cycle, as well as BC productivity were observed to be slightly higher in the first 12 h. However, due to the absence of sufficient oxygen, lactic acid was accumulated from pyruvic acid at 18 h, which was not in favor of BC production. At the anode, DC inhibited cell growth in 6 h when compared to the control. The metabolic activity in G. xylinus was inhibited through the suppression of the tricarboxylic acid cycle and glycolysis. At 18-24 h, cell density was observed to decrease, which might be due to the electrolysis of water that significantly dropped the pH of cultural broth far beyond the optimal range. Meanwhile, metabolites for self-protection were accumulated, for instance proline, glutamic acid, gluconic acid and fatty acids. Notably, the accumulation of gluconic acid and lactic acid made it a really tough acid stress to cells at the anode and finally led to depression of cell growth.

  20. Investigation of In Vitro Bone Cell Adhesion and Proliferation on Ti Using Direct Current Stimulation.

    Science.gov (United States)

    Bodhak, Subhadip; Bose, Susmita; Kinsel, William C; Bandyopadhyay, Amit

    2012-12-01

    Our objective was to establish an in vitro cell culture protocol to improve bone cell attachment and proliferation on Ti substrate using direct current stimulation. For this purpose, a custom made electrical stimulator was developed and a varying range of direct currents, from 5 to 25 µA, were used to study the current stimulation effect on bone cells cultured on conducting Ti samples in vitro. Cell-materials interaction was studied for a maximum of 5 days by culturing with human fetal osteoblast cells (hFOB). The direct current was applied in every 8 h time interval and the duration of electrical stimulation was kept constant at 15 min for all cases. In vitro results showed that direct current stimulation significantly favored bone cell attachment and proliferation in comparison to nonstimulated Ti surface. Immunochemistry and confocal microscopy results confirmed that the cell adhesion was most pronounced on 25 µA direct current stimulated Ti surfaces as hFOB cells expressed higher vinculin protein with increasing amount of direct current. Furthermore, MTT assay results established that cells grew 30% higher in number under 25 µA electrical stimulation as compared to nonstimulated Ti surface after 5 days of culture period. In this work we have successfully established a simple and cost effective in vitro protocol offering easy and rapid analysis of bone cell-materials interaction which can be used in promotion of bone cell attachment and growth on Ti substrate using direct current electrical stimulation in an in vitro model.

  1. Investigation of the current break-down phenomena in solar cells

    Energy Technology Data Exchange (ETDEWEB)

    Sharma, S.K.; Srinivasamurthy, N.; Agrawal, B.L. [Power Systems Group, ISRO Satellite Centre, Bangalore (India)

    1996-08-15

    Observed reverse current-voltage characteristics of the single crystal silicon and gallium arsenide solar cells have been analyzed. Physical mechanisms behind the junction break-down in silicon cells and current break-down in gallium arsenide cells have been identified. Preliminary estimates of the diffusion capacitance in GaAs cells have been presented

  2. Experimental and theoretical investigations on the singularity of the intensity factor of the current in high temperature superconductors

    Science.gov (United States)

    Zhang, Xingyi; Huang, Yi; Zhou, Jun; Zhou, Youhe

    2013-08-01

    This paper presents experimental and analytical investigations into the distribution of current around a through-edge crack located in an infinitely long cylindrical high temperature superconductor (HTS) on the basis of the Bean model. Current distributions around the crack in the HTS without deformation are obtained by a simple conformal mapping. It is shown that the current is singular at the tip of the crack. An intensity factor of the current is introduced to characterize the singularity, the order of which is equal to -1. Additionally, an experimental verification according to the trapped field distributions around the crack is carried out, and the experimental results show little difference with the theoretical analysis.

  3. Investigations of Tracking Phenomena in Silicone Rubber Using Moving Average Current Technique

    Institute of Scientific and Technical Information of China (English)

    R. Sarathi; S. Chandrasekar

    2004-01-01

    In the present work, tracking phenomenon in Silicone rubber material has been studied under AC and DC voltage, with ammonium chloride as a contaminant. It is observed that the tracking is more severe under the DC voltages. The tracking time is less under negative DC compared to the positive DC voltage. The tracking mechanism is explained in detail. The leakage current during the tracking studies was as measured and the moving average technique was adopted to understand the trend in current flow. The leakage current magnitude is high with thermally aged specimens compared to the virgin specimen, irrespective of the type of applied voltage. It is realized that the tracking time and the leakage current magnitude shows an inverse relationship.

  4. Anodic Oxidation of Carbon Steel at High Current Densities and Investigation of Its Corrosion Behavior

    Science.gov (United States)

    Fattah-Alhosseini, Arash; Khan, Hamid Yazdani

    2017-02-01

    This work aims at studying the influence of high current densities on the anodization of carbon steel. Anodic protective coatings were prepared on carbon steel at current densities of 100, 125, and 150 A/dm2 followed by a final heat treatment. Coatings microstructures and morphologies were analyzed using X-ray diffraction (XRD) and scanning electron microscope (SEM). The corrosion resistance of the uncoated carbon steel substrate and the anodic coatings were evaluated in 3.5 wt pct NaCl solution through electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization measurements. The results showed that the anodic oxide coatings which were prepared at higher current densities had thicker coatings as a result of a higher anodic forming voltage. Therefore, the anodized coatings showed better anti-corrosion properties compared to those obtained at lower current densities and the base metal.

  5. INVESTIGATION OF MICROPROCESSOR CURRENT PROTECTION LINES WITH IMPROVED INDICES OF TECHNICAL PERFECTION

    Directory of Open Access Journals (Sweden)

    E. V. Buloichyk

    2014-01-01

    Full Text Available Technical perfection improvement of microprocessor current protection of distribution networks lines is provided by introduction of asymmetrical fault mode determination and fault location functions in the algorithm of its functioning. As a result of computing experiment the basic indices of the technical perfection of current protection have been obtained in the paper. The paper proves high efficiency of the proposed methods that ensure selective and proper operation in the different modes of the controlled line.

  6. Investigating the effects of the interface defects on the gate leakage current in MOSFETs

    Science.gov (United States)

    Mao, Ling-Feng

    2008-08-01

    The effects of the interface defects on the gate leakage current have been numerically modeled. The results demonstrate that the shallow and deep traps have different effects on the dependence relation of the stress-induced leakage current on the oxide electric field in the regime of direct tunneling, whereas both traps keep the same dependence relation in the regime of Fowler-Nordheim tunneling. The results also shows that the stress-induced leakage current will be the largest at a moderate oxide voltage for the electron interface traps but it increases with the decreasing oxide voltage for the hole interface traps. The results illustrate that the stress-induced leakage current strongly depends on the location of the electron interface traps but it weakly depends on the location of the hole interface traps. The increase in the gate leakage current caused by the electron interface traps can predict the increase, then decrease in the stress-induced leakage current, with decreasing oxide thickness, which is observed experimentally. And the electron interface trap level will have a large effect on the peak height and position.

  7. An investigation of counter-current flow in porous media with history-dependent modeling

    Science.gov (United States)

    Li, G.; Grader, A. S.; Halleck, P. H.; Karpyn, Z. T.

    2003-04-01

    Counter-current fluid flow occurs in many reservoir processes. It is important to understand and model these processes in order to operate them effectively. Both drainage and imbibition processes exist simultaneously when counter-current flow occurs. It has thus proven difficult to model this type of flow, especially when fluid banks form. Previously, counter-current flow experiments have been done in glass bead packs and the spatial and temporal saturation distributions obtained with X-ray computed tomography (CT). In the current paper, a new saturation-history-dependent approach has been developed to simulate the experiments. Hysteresis in both capillary pressure and relative permeabilities is considered during the process of matching the simulation results to experimental data. Capillary pressure and relative permeabilities are extracted with the aid of a deterministic reservoir simulator. During the history matching process, a family of curves (called scanning curves) is constructed connecting the two branches of the capillary hystersis loop. Each grid block of the sample is assigned a different scanning curve according to its saturation history. Simulation of the experiments reproduced two-dimensional saturation distributions over time with good accuracy. Similar results could not be obtained with traditional simulation using only one capillary pressure curve. History-dependent modeling successfully predicted cross-diameter counter-current flow in a cylindrical geometry. The parameters used in the single capillary pressure method are the average of the parameters used in the history-dependent method. Total effective mobility controls the flow process, being smaller in counter-current flow than in co-current flow. Experiments documented in the literature that exhibited formation of fluid banks were also successfully simulated. We anticipate that application of this method will improve the prediction of full-scale fluid flow processes such as ground water

  8. Investigation of in vitro bone cell adhesion and proliferation on Ti using direct current stimulation

    Energy Technology Data Exchange (ETDEWEB)

    Bodhak, Subhadip; Bose, Susmita [W. M. Keck Biomedical Materials Research Laboratory, School of Mechanical and Materials Engineering, Washington State University, Pullman, WA 99164-2920 (United States); Kinsel, William C. [Mechanical Engineering, Washington State University, Tri-Cities, WA (United States); Bandyopadhyay, Amit, E-mail: amitband@wsu.edu [W. M. Keck Biomedical Materials Research Laboratory, School of Mechanical and Materials Engineering, Washington State University, Pullman, WA 99164-2920 (United States)

    2012-12-01

    Our objective was to establish an in vitro cell culture protocol to improve bone cell attachment and proliferation on Ti substrate using direct current stimulation. For this purpose, a custom made electrical stimulator was developed and a varying range of direct currents, from 5 to 25 {mu}A, was used to study the current stimulation effect on bone cells cultured on conducting Ti samples in vitro. Cell-material interaction was studied for a maximum of 5 days by culturing with human fetal osteoblast cells (hFOB). The direct current was applied in every 8 h time interval and the duration of electrical stimulation was kept constant at 15 min for all cases. In vitro results showed that direct current stimulation significantly favored bone cell attachment and proliferation in comparison to nonstimulated Ti surface. Immunochemistry and confocal microscopy results confirmed that the cell adhesion was most pronounced on 25 {mu}A direct current stimulated Ti surfaces as hFOB cells expressed higher vinculin protein with increasing amount of direct current. Furthermore, MTT assay results established that cells grew 30% higher in number under 25 {mu}A electrical stimulation as compared to nonstimulated Ti surface after 5 days of culture period. In this work we have successfully established a simple and cost effective in vitro protocol offering easy and rapid analysis of bone cell-material interaction which can be used in promotion of bone cell attachment and growth on Ti substrate using direct current electrical stimulation in an in vitro model. - Highlights: Black-Right-Pointing-Pointer D.C. stimulation was used to enhance in vitro bone cell adhesion and proliferation. Black-Right-Pointing-Pointer Cells cultured on Ti were stimulated by using a custom made electrical stimulator. Black-Right-Pointing-Pointer Optimization was performed by using a varying range of direct currents {approx} 5 to 25 {mu}A. Black-Right-Pointing-Pointer 25 {mu}A stimulation was found most beneficial

  9. The Investigation of Primary School Teachers' Opinions Related to the Current Events

    Directory of Open Access Journals (Sweden)

    Halil İbrahim Sağlam

    2016-09-01

    Full Text Available The aim of this study is to examine primary school teachers’ opinions related to current events. The study group is consisted of total 30 primary school teachers who take part in THE GROUPS OF 15 female (%50 and 15 male (%50 in Sakarya during 2015 -2016 the education year. The study is carried out under science facts pattern of qualitative research designs. In order to reveal teachers’ views on current events, the form of semi-structured interviews from which is qualitative data collection tools is used. There are two sections in this study. First section is about teachers' personal information and second section is about teachers' questions to determine their views on current events. For the content validity of the questions in the negotiation form, it has been consulted with three experts and made the necessary adjustments in line with their proposals. In addition, the clarity of the questions in the negotiation form has been checked by discussing with five teachers and then the form has been finalized. The data obtained from teachers ARE analyzed by using content analysis. In the study, it is concluded that 97% of the teachers follow the current events. It is shown that 93% of female teachers and 100% male teachers follow the current events. FURTHERMORE, it is indicated that %100 of the teachers use the internet in their house.

  10. Investigation of lower hybrid current drive during H-mode in EAST tokamak

    Institute of Scientific and Technical Information of China (English)

    Li Miao-Hui; Liu Fu-Kun; Wang Mao; Xu Han-Dong; Wan Bao-Nian; Ding Bo-Jiang; Kong Er-Hua; Zhang Lei; Zhang Xin-Jun; Qian Jin-Ping; Yan Ning; Han Xiao-Feng; Shan Jia-Fang

    2011-01-01

    H-mode discharges with lower hybrid current drive (LHCD) alone are achieved in EAST divertor plasma over a wide parameter range.These H-mode discharges are characterized by a sudden drop in Dα emission and a spontaneous rise in main plasma density.Good lower hybrid (LH) coupling during H-mode is obtained by putting the plasma close to the antenna and by injecting D2 gas from a pipe near the grill mouse.The analysis of lower hybrid current drive properties shows that the LH deposition profile shifts off axis during H-mode,and current drive (CD) efficiency decreases due to the increase in density.Modeling results of H-mode discharges with a general ray tracing code GENRAY are reported.

  11. Investigation of leakage current and breakdown voltage in irradiated double-sided 3D silicon sensors

    Science.gov (United States)

    Dalla Betta, G.-F.; Ayllon, N.; Boscardin, M.; Hoeferkamp, M.; Mattiazzo, S.; McDuff, H.; Mendicino, R.; Povoli, M.; Seidel, S.; Sultan, D. M. S.; Zorzi, N.

    2016-09-01

    We report on an experimental study aimed at gaining deeper insight into the leakage current and breakdown voltage of irradiated double-sided 3D silicon sensors from FBK, so as to improve both the design and the fabrication technology for use at future hadron colliders such as the High Luminosity LHC. Several 3D diode samples of different technologies and layout are considered, as well as several irradiations with different particle types. While the leakage current follows the expected linear trend with radiation fluence, the breakdown voltage is found to depend on both the bulk damage and the surface damage, and its values can vary significantly with sensor geometry and process details.

  12. Investigation of cathodic current collection in lithium/manganese dioxide cells by electrochemical impedance spectroscopy

    Energy Technology Data Exchange (ETDEWEB)

    Merritt, D.R.; Schmidt, C.L. [Medtronic, Inc., Minneapolis, MN (United States)

    1994-12-31

    Contact impedance between pressed composite manganese dioxide cathodes and current collectors has been shown to play an important role in the overall impedance of primary Li/MnO{sub 2} cells. Specifically, this impedance is manifested by an arc in the complex-plane impedance plot, representative of a parallel resistive/capacitive combination, This paper presents the results of a systematic series of experiments designed to better define the relationship between cathodic current collector configuration and cell impedance. A refined equivalent circuit model of the Li/MnO{sub 2} cell is also presented.

  13. Ways of Thinking Globalisation--Insights into a Currently Running Investigation of Students' Ideas of Globalisation

    Science.gov (United States)

    Fischer, Sebastian; Fischer, Florian; Kleinschmidt, Malte; Lange, Dirk

    2014-01-01

    The investigation is about which ideas ninth form students at grammar schools and secondary modern schools have about globalisation. It shall be investigated if the perception of and judgement on globalisation-connected contexts happens along social structure-specific patterns. At first, by way of a questionnaire, the field of ideas is supposed to…

  14. Investigation of sounding rocket observations of field-aligned currents and electron temperature

    Science.gov (United States)

    Cohen, I. J.; Lessard, M.; Zettergren, M. D.; Moen, J.; Lynch, K. A.; Heavisides, J. M.

    2014-12-01

    Strangeway et al. [2005] and other authors have concluded that the establishment of the ambipolar field by the deposition of energy from soft electron precipitation is a significant driver of type-2 ion upflows. Likewise, Clemmons et al. [2008] and Zhang et al. [2012] proposed processes by which soft electron precipitation may play a role in heating neutrals and contribute to neutral upwelling. In both situations the thermal ionospheric electron population plays a crucial role in both generation of the ambipolar field and in collisional energy exchange with the atmosphere through a variety of processes. In this study we examine the dynamics of the electron population, specifically the temperature, in a slightly different context - focusing on the auroral downward current region (DCR). In many cases auroral DCRs may be depleted of plasma, which sets up interesting conditions involving thermoelectric heat fluxes (which flow upward - in the opposite direction from the current), adiabatic expansion due to the high (upward) speed of the electrons carrying the downward current, heat exchange from ions which have elevated temperatures due to frictional heating, and direct frictional heating of the electrons. A detailed understanding of the electron temperature in auroral DCRs is necessary to make quantitative statements about recombination, upflow, cavitation and a host of other processes relevant to ion outflow. In this study, we compare in situ rocket observations of electron temperature, density, and current densities with predictions from the Zettergren and Semeter [2012] model in an attempt to better understand the dynamics and relationships between these parameters in DCRs.

  15. Investigation of optical currents in coherent and partially coherent vector fields

    DEFF Research Database (Denmark)

    Angelsky, O. V.; Gorsky, M. P.; Maksimyak, P. P.

    2011-01-01

    in the arrangements of two-wave and four-wave superposition on the characteris-tics of the microparticle’s motion has been analyzed. The prospects of stud-ying temporal coherence using the proposed approach are made. For the first time, the possibility of diagnostics of optical currents in liquids caused...

  16. Current-voltage behaviour of bipolar membranes in concentrated salt solutions investigated with chronopotentiometry

    NARCIS (Netherlands)

    Wilhelm, F.G.; Vegt, van der N.F.A.; Strathmann, H.; Wessling, M.

    2002-01-01

    Chronopotentiometry is used as a tool to obtain detailed information on the transport behaviour of the bipolar membrane BP-1 in solutions of high sodium chloride concentration above the limiting current density. We discuss critically the interpretation of the observed transition times. The occurrenc

  17. Investigating Current Status of English for Academic Purposes (EAP in Iran; Revisiting ESP Specificity Continuum

    Directory of Open Access Journals (Sweden)

    Marjan Vosoughi

    2013-05-01

    Full Text Available The EAP textbooks which are currently taught in Iranian universities don't seem to satisfy the necessary requirements current in new enquires of EAP research.  An EAP book sample from SAMT 1 publications for the students of medicine was chosen for a critical analysis on three criteria including: evaluating the objectives, reviewing the content, and evaluating the overall structure. The exploratory reviews showed that there must be major changes in EAP for medical students of SAMT to meet the specific needs of the target group above. In this article, the general status of ESP material development approaches is also depicted diachronically in order to evaluate the present situation in Iran against appropriate recent approaches towards EAP material development in the world. Recommended implications of some kind are presented throughout the various parts of the present survey.     Keywords: EAP materials, English for medical purposes (EMP, specificity continuum, material development

  18. GEOS-3 ocean current investigation using radar altimeter profiling. [Gulf Stream surface topography

    Science.gov (United States)

    Leitao, C. D.; Huang, N. E.; Parra, C. G.

    1978-01-01

    Both quasi-stationary and dynamic departures from the marine geoid were successfully detected using altitude measurements from the GEOS-3 radar altimeter. The quasi-stationary departures are observed either as elevation changes in single pass profiles across the Gulf Stream or at the crowding of contour lines at the western and northern areas of topographic maps generated using altimeter data spanning one month or longer. Dynamic features such as current meandering and spawned eddies can be monitored by comparing monthly mean maps. Comparison of altimeter inferred eddies with IR detected thermal rings indicates agreement of the two techniques. Estimates of current velocity are made using derived slope estimates in conjunction with the geostrophic equation.

  19. A computational investigation of cardiac caveolae as a source of persistent sodium current

    Directory of Open Access Journals (Sweden)

    Ian M. Besse

    2011-11-01

    Full Text Available Recent studies of cholesterol-rich membrane microdomains, called caveolae, reveal that caveolae are reservoirs of recruitable sodium ion channels. Caveolar channels constitute a substantial and previously unrecognized source of sodium current in cardiac cells. In this paper we model for the first time caveolar sodium currents and their contributions to cardiac action potential morphology. We show that the beta-agonist-induced opening of caveolae may have substantial impacts on peak overshoot, maximum upstroke velocity, and ultimately conduction velocity. Additionally, we show that prolonged action potentials and the formation of potentially arrhythmogenic afterdepolarizations, can arise if caveolae open intermittently throughout the action potential. Our simulations suggest that there may exist routes to delayed repolarization, and the arrhythmias associated with such delays, that are independent of channelopathies.

  20. Investigation of drain current transient behavior in SLS TFTs with the DLTS technique

    Energy Technology Data Exchange (ETDEWEB)

    Exarchos, M A [National and Kapodistrian University of Athens, Physics Department, Solid State Physics Section, Athens 15784 (Greece); Papaioannou, G J [National and Kapodistrian University of Athens, Physics Department, Solid State Physics Section, Athens 15784 (Greece); Kouvatsos, D N [N.C.S.R. Demokritos, Institute of Microelecronics, Athens 15310 (Greece); Voutsas, A T [L.C.D. Process Technology Laboratory, SHARP Labs of America, Inc., Washington 98607 (United States)

    2005-01-01

    In this work, the study of drain current overshoot transients of thin film transistors (TFTs) fabricated by excimer laser sequential lateral solidification (ELA SLS) process is presented. Drain current transient behavior, is ascribed to carrier capture/emission processes within the transistors' Si body, and represents complex mechanisms differently responding at dark and under illumination conditions. Additionally, the thickness of the Si body film, which is an important parameter for the material structure evaluation, ranged from 30 nm to 100 nm. The results were stemmed by deep level transient spectroscopy (DLTS) technique and measurements were conducted within the temperature interval of 200 K to 400 K. The impact of illumination, contributes mainly at lower temperatures through electron-hole generation processes, compensating though carrier freeze-out phenomena.

  1. Investigation of drain current transient behavior in SLS TFTs with the DLTS technique

    Science.gov (United States)

    Exarchos, M. A.; Papaioannou, G. J.; Kouvatsos, D. N.; Voutsas, A. T.

    2005-01-01

    In this work, the study of drain current overshoot transients of thin film transistors (TFTs) fabricated by excimer laser sequential lateral solidification (ELA SLS) process is presented. Drain current transient behavior, is ascribed to carrier capture/emission processes within the transistors' Si body, and represents complex mechanisms differently responding at dark and under illumination conditions. Additionally, the thickness of the Si body film, which is an important parameter for the material structure evaluation, ranged from 30 nm to 100 nm. The results were stemmed by deep level transient spectroscopy (DLTS) technique and measurements were conducted within the temperature interval of 200 K to 400 K. The impact of illumination, contributes mainly at lower temperatures through electron-hole generation processes, compensating though carrier freeze-out phenomena.

  2. Investigations on the performances of the electrical generator of a rim-driven marine current turbine”

    OpenAIRE

    2008-01-01

    In this paper, the electrical generator of a rim-driven horizontal-axis current turbine is modeled in detail. Its main characteristics and performances are evaluated (efficiency, mass, cost, etc). This generator is of permanent magnet direct-driven synchronous type and is connected to a variable speed power electronics drive. It is then compared to a more traditional technology (a pod generator) in terms of mass and cost for a common set of specification. In addition, due to the specific geom...

  3. Investigations on the electrical current-voltage response in protein light receptors

    CERN Document Server

    Alfinito, E; Reggiani, L

    2014-01-01

    We report a theoretical/computational approach for modeling the current-voltage characteristics of sensing proteins. The modeling is applied to a couple of transmembrane proteins, bacteriorhodopsin and proteorhodopsin, sensitive to visible light and promising biomaterials for the development of a new generation of photo-transducers. The agreement between theory and experiments sheds new light on the microscopic interpretation of charge transfer in proteins and biological materials in general.

  4. Experimental investigation of quasiperiodic-chaotic-quasiperiodic-chaotic transition in a direct current magnetron sputtering plasma

    Energy Technology Data Exchange (ETDEWEB)

    Sabavath, Gopi Kishan; Banerjee, I.; Mahapatra, S. K., E-mail: skmahapatra@bitmesra.ac.in [Plasma Laboratory, Department of Physics, Birla Institute of Technology-Mesra, Ranchi 835215 (India); Shaw, Pankaj Kumar; Sekar Iyengar, A. N. [Plasma Physics Division, Saha Institute of Nuclear Physics, 1/AF, Bidhannagar, Kolkata 700064 (India)

    2015-08-15

    Floating potential fluctuations from a direct current magnetron sputtering plasma have been analysed using time series analysis techniques like phase space plots, power spectra, frequency bifurcation plot, etc. The system exhibits quasiperiodic-chaotic-quasiperiodic-chaotic transitions as the discharge voltage was increased. The transitions of the fluctuations, quantified using the largest Lyapunov exponent, have been corroborated by Hurst exponent and the Shannon entropy. The Shannon entropy is high for quasiperiodic and low for chaotic oscillations.

  5. Investigation of data retention under current bias for phase change memory

    Science.gov (United States)

    Lu, Yao-Yao; Cai, Dao-Lin; Chen, Yi-Feng; Wang, Yue-Qing; Wei, Hong-Yang; Huo, Ru-Ru; Song, Zhi-Tang

    2016-10-01

    With Phase-change memory (PCM), information can be stored as different resistance states even when not powered. In order to accurately characterize the reliability of PCM devices, data retention has to be tested carefully. In this paper, a new test method is applied to measure the data retention of T-shaped PCM devices. This method makes it possible to accelerate crystallization in the amorphous area by using current bias. The new method works based on the field-induced crystallization theory, and could be able to gather fast and detailed information about high-resistance state's failure process, and at the same time, it could avoid issues related to high temperature. Experimental data for T-shaped PCM devices based on Ge2Sb2Te5 are presented and analyzed. An exponential trend-line of failure time t versus reciprocal bias current 1/I shows only negligible deviation of the measured data points, enabling the extrapolation of the retention behavior for ten-year lifetime. A maximum disturb current value of 5.08 μA is extracted to guarantee the ten years data retention requirement for PCM applications.

  6. Investigation of iron current measurement to detect combustion quality; Ion denryu ni yoru nensho jotai kenshutsu no kento

    Energy Technology Data Exchange (ETDEWEB)

    Nakata, K.; Mogi, K. [Toyota Motor Corp., Aichi (Japan)

    1997-10-01

    The possibility and problems were investigated in detecting the combustion quality by means of ion current measured at the spark plug. The ion current has two peaks during one combustion stroke; first peak is generated by flame around the spark plug just after ignition and second one appears with the rise in temperature of burned gases. As the result of investigations, it was confirmed that the first ion peak might be useful to forecast the combustion quality, but it would be hard to practice owing to the spark duration. And the second peak offered the information of combustion chamber pressure. 4 refs., 12 figs., 1 tab.

  7. Current Proteomic Methods to Investigate the Dynamics of Histone Turnover in the Central Nervous System

    Science.gov (United States)

    Farrelly, L.A.; Dill, B.D.; Molina, H.; Birtwistle, M.R.; Maze, I.

    2016-01-01

    Characterizing the dynamic behavior of nucleosomes in the central nervous system is vital to our understanding of brain-specific chromatin-templated processes and their roles in transcriptional plasticity. Histone turnover—the complete loss of old, and replacement by new, nucleosomal histones—is one such phenomenon that has recently been shown to be critical for cell-type-specific transcription in brain, synaptic plasticity, and cognition. Such revelations that histones, long believed to static proteins in postmitotic cells, are highly dynamic in neurons were only possible owing to significant advances in analytical chemistry-based techniques, which now provide a platform for investigations of histone dynamics in both healthy and diseased tissues. Here, we discuss both past and present proteomic methods (eg, mass spectrometry, human “bomb pulse labeling”) for investigating histone turnover in brain with the hope that such information may stimulate future investigations of both adaptive and aberrant forms of “neuroepigenetic” plasticity. PMID:27423867

  8. The mesospheric sodium layer as a remotely, optically pumped magnetometer for investigation of Birkeland currents

    Science.gov (United States)

    Johnsen, Magnar G.; Matzka, Jürgen; Hoppe, Ulf-Peter

    2016-04-01

    By means of optical pumping, it is possible to use the naturally occurring sodium layer in the mesosphere to measure Earth's scalar magnetic field at ~90 km above ground. This is an altitude not accessible by other means than rockets, which only will provide point measurements of very short time scales. We are planning to modify the sodium lidar at ALOMAR in Northern Norway to be able, for the first time, to measure and monitor the magnetic field in situ in the high latitude mesosphere over longer time scales. The planned modifications to the lidar instrument will allow alternating between the new magnetometer mode and its present mode for atmospheric temperatures and winds. The technique, which has been proposed earlier for measurements at low or mid-latitudes for studies of Earth's internal magnetic field, will in our project be applied to high latitudes in the auroral zone. This opens for a completely new domain of measurements of externally generated geomagnetic variations related to currents in the magnetosphere-ionosphere system. In particular, we aim to measure the magnetic field variations in close vicinity to Birkeland currents associated with particle precipitation events penetrating to altitudes below 90 km and small-scale, discrete auroral arcs. It is, furthermore, anticipated that it will be possible to detect horizontal current structures in the E-layer on much smaller length scales than it is presently possible from ground observations alone. During the project we plan take advantage of the rich space science infrastructure located in northern Norway, including ALOMAR, EISCAT and the Tromsø Geophysical Observatory magnetometer network. If possible, we also aim to make measurements in conjunction with overpasses of the SWARM satellites.

  9. An Investigation on the Current Situation of Management Information Systems Discipline in Turkey

    OpenAIRE

    Serdar YARLIKAŞ

    2015-01-01

    The purpose of this research is to investigate the development of management information systems field by evaluating the theses conducted at universities in Turkey in the departments of management information systems and science of management information systems. First, this study aims to determine the distribution of the theses in terms of years, subjects and the research methods used. Another purpose of this study was to determine which of the related disciplines of management information s...

  10. Experimental investigation of the effect of titanium dioxide and barium titanate additives on DC transient currents in low density polyethylene

    DEFF Research Database (Denmark)

    Khalil, M.S; Henk, Peter O; Henriksen, Mogens

    1988-01-01

    The effect of titanium dioxide as a semiconductive additive and barium titanate as a highly polar additive on the DC transient currents in low-density polyethylene is investigated. Experiments were made using thick specimens under a high electric field (>25×106 V/m) and a constant temperature of 40...

  11. Demographics and complaints of university students who sought help at a campus mental health service between 1987 and 2004

    Directory of Open Access Journals (Sweden)

    Maria Lilian Coelho de Oliveira

    Full Text Available CONTEXT AND OBJECTIVE: Client characterization is an important step in evaluating the services offered by campus counseling and mental health centers and in their further planning and development. The objectives here were to describe reported complaints and demographics among students who sought counseling/mental healthcare at a Brazilian campus mental health service over a 17-year period and to compare these characteristics with those of the general university student body. DESIGN AND SETTING: Retrospective study at the Psychological and Psychiatric Service for Students (SAPPE, Universidade Estadual de Campinas (Unicamp. METHODS: The participants were all of the 2,194 students who sought counseling/mental health care at SAPPE from 1987 to 2004. Information was obtained from clients’ clinical charts. Unicamp’s database was consulted for general information on its students. RESULTS: The findings indicated overrepresentation, among the clients, of undergraduates, female students, students from Brazilian states other than São Paulo, students living in the campus residence hall and those whose main source of income was a scholarship grant. We also found overrepresentation of Humanities and Arts students among the clients. The most frequently reported complaints were difficulties in interpersonal relationships, family conflicts and poor academic performance. CONCLUSION: Course level (undergraduate or postgraduate, study field, living in a university residential facility and reliance on a scholarship grant were found to influence the behavior of seeking mental health counseling among Brazilian university students in this study. Course level was found to influence the pattern of complaints reported at first contact with the mental health service.

  12. Investigation on the Arc Ignition Characteristics and Energy Absorption of Liquid Metal Current Limiter Based on Self-Pinch Effect

    Institute of Scientific and Technical Information of China (English)

    JU Xingbao; SUN Haishun; YANG Zhuo; ZHANG Junmin

    2016-01-01

    The GaInSn liquid metal current limiter based on the fluid pinch effect has broad application prospects due to its particular properties.However,the limited rated current and ability of power dissipation are the critical problems for its wide application.Firstly,the temperature distribution of the liquid metal current limiter (LMCL) was obtained by experiments with a rated current of 1 kA and the arc ignition phenomenon was observed with 1.5 kA,which indicates that the rated current is mainly limited by the arc rather than the high temperature compared to the traditional switchgears.Furthermore,an improved method is proposed by adding the paralleled pure resistance,impedance or another LMCL element to protect the setup from the fault energy concentration in the setup.The problem of a slower arc voltage increasing rate can be solved by adding a paralleled impedance with suitable parameters.Finally,the current limiting properties based on the improved method were investigated and the alternating oscillating current was found between two paralleled LMCL elements owing to their deviation of arc ignition in reality.

  13. An in vitro investigation of two currently marketed dentin tubule occlusion dentifrices.

    Science.gov (United States)

    Parkinson, Charles R; Willson, Richard J

    2011-01-01

    The objective of this study was to evaluate the relative level of dentin tubule occlusion afforded by two dentifrices specifically developed to occlude dentin tubules, following finger-applied dab-on application and by repeated brushing, in a longitudinal acid-challenge-based dentin disk model. The impact of a dietary acid alone (grapefruit juice) on the level of dentin tubule occlusion conferred by each product following dab-on application was also explored in a separate short-term stand-alone exploratory dentin disk-based in vitro study. For the longitudinal study, 120 bovine dentin discs, polished and etched in citric acid for two minutes to provide a smooth dentin surface with patent tubules, were divided into three treatment groups and subjected to a finger application of the dentifrice only, or a combination of finger application and brushing. Prior to and between treatments, the dentin samples were stored in saliva (for > 60 minutes). The test products were an 8% w/w strontium acetate dentifrice (currently marketed as Sensodyne Rapid Relief), an arginine-based dentifrice (marketed as Colgate Sensitive Pro-Relief), and deionized water. For the exploratory acid resistance study, 24 dentin samples were divided into two treatment groups. Treatment consisted of a single dab-on application with the test dentifrices to the hydrated surface of dentin, followed by exposure to either a 30-second or 10-minute grapefruit juice acid challenge. For both models, at the end of each treatment period, the samples were removed for scanning electron microscopy analysis and graded on a categorical visual scale. All data were analyzed statistically by unpaired t-test comparison. In the longitudinal (four-day) model, the strontium acetate-based dentifrice occluded dentin tubules significantly better than the currently marketed arginine-based dentifrice post-dab-on treatment and grapefruit juice challenge (p < 0.0001). At all other time points, the strontium acetate dentifrice

  14. An Investigation of the Variety and Complexity of Statistical Methods Used in Current Internal Medicine Literature.

    Science.gov (United States)

    Narayanan, Roshni; Nugent, Rebecca; Nugent, Kenneth

    2015-10-01

    Accreditation Council for Graduate Medical Education guidelines require internal medicine residents to develop skills in the interpretation of medical literature and to understand the principles of research. A necessary component is the ability to understand the statistical methods used and their results, material that is not an in-depth focus of most medical school curricula and residency programs. Given the breadth and depth of the current medical literature and an increasing emphasis on complex, sophisticated statistical analyses, the statistical foundation and education necessary for residents are uncertain. We reviewed the statistical methods and terms used in 49 articles discussed at the journal club in the Department of Internal Medicine residency program at Texas Tech University between January 1, 2013 and June 30, 2013. We collected information on the study type and on the statistical methods used for summarizing and comparing samples, determining the relations between independent variables and dependent variables, and estimating models. We then identified the typical statistics education level at which each term or method is learned. A total of 14 articles came from the Journal of the American Medical Association Internal Medicine, 11 from the New England Journal of Medicine, 6 from the Annals of Internal Medicine, 5 from the Journal of the American Medical Association, and 13 from other journals. Twenty reported randomized controlled trials. Summary statistics included mean values (39 articles), category counts (38), and medians (28). Group comparisons were based on t tests (14 articles), χ2 tests (21), and nonparametric ranking tests (10). The relations between dependent and independent variables were analyzed with simple regression (6 articles), multivariate regression (11), and logistic regression (8). Nine studies reported odds ratios with 95% confidence intervals, and seven analyzed test performance using sensitivity and specificity calculations

  15. An Investigation of Current and Future Data Systems in Numerical Meteorology

    Science.gov (United States)

    Diak, George R.; Burns, Barbara A.; Wu, Xiangqian

    1996-01-01

    The Advanced Microwave Sounding Unit (AMSU) and the Microwave Humidity Sounder (MHS) constitute the advanced microwave sounding system to be flown on the EOS-PM platform. Similar instruments (the AMSU-A corresponding to the AMSU and the AMSU-B corresponding to the MHS) are scheduled to become operational on the NOAA polar orbiting satellites beginning with NOAA-K. The unique characteristics of the AMSU-MHS instruments, as compared to the capabilities of their infrared and microwave predecessors, introduce new opportunities, and challenges, for operational retrievals of atmospheric structure. Not only will these new data improve present capabilities for the retrieval of atmospheric profiles of temperature and moisture, but they will provide the only opportunity for successfully retrieving atmospheric temperature and humidity profiles in the presence of modest amounts of cloud and precipitation. A complementary opportunity is presented by the potential of the AMSU-MHS to obtain information about the structure of clouds and precipitation. The data sets obtained will contribute to the current knowledge of global water and energy budgets, and provide critical information on the horizontal and vertical distribution of tropospheric water vapor, the spatial and temporal distribution of rain, and the relationship of cloud formation and dissipation to atmospheric dynamics and thermodynamics.

  16. An Experimental Investigation of Passive Variable-Pitch Vertical-Axis Ocean Current Turbine

    Directory of Open Access Journals (Sweden)

    Ridho Hantoro

    2011-04-01

    Full Text Available Vertical-axis hydrokinetic turbines with fixed pitch blades typically suffer from poor starting torque, low efficiency and shaking due to large fluctuations in both radial and tangential force with azimuth angle. Maximizing the turbine power output can be achieved only if the mechanism of generation of the hydrodynamic force on the blades is clearly identified and tools to design high-performance rotors are developed. This paper describes an initial experimental investigation to understand more of the performance on vertical-axis turbine related to the effect of fixed-pitch and passive variable-pitch application using airfoil NACA 0018. Comparative analysis according to aspects of rotation and tip speed ratios was discussed. Information regarding the changes of foil position in passive variable-pitch during rotation at a limited range of flow velocity variations test was obtained and analyzed.

  17. DNA typing in forensic medicine and in criminal investigations: a current survey

    Science.gov (United States)

    Benecke, Mark

    Since 1985 DNA typing of biological material has become one of the most powerful tools for personal identification in forensic medicine and in criminal investigations [1-6]. Classical DNA 〝fingerprinting'' is increasingly being replaced by polymerase chain reaction (PCR) based technology which detects very short polymorphic stretches of DNA [7-15]. DNA loci which forensic scientists study do not code for proteins, and they are spread over the whole genome [16, 17]. These loci are neutral, and few provide any information about individuals except for their identity. Minute amounts of biological material are sufficient for DNA typing. Many European countries are beginning to establish databases to store DNA profiles of crime scenes and known offenders. A brief overview is given of past and present DNA typing and the establishment of forensic DNA databases in Europe.

  18. Investigations into the Effect of Current Velocity on Amidoxime-Based Polymeric Uranium Adsorbent Performance

    Energy Technology Data Exchange (ETDEWEB)

    Gill, Gary A. [Pacific Northwest National Lab. (PNNL), Sequim, WA (United States). Marine Sciences Lab.; Kuo, Li-Jung [Pacific Northwest National Lab. (PNNL), Sequim, WA (United States). Marine Sciences Lab.; Strivens, Jonathan E. [Pacific Northwest National Lab. (PNNL), Sequim, WA (United States). Marine Sciences Lab.; Wood, Jordana R. [Pacific Northwest National Lab. (PNNL), Sequim, WA (United States). Marine Sciences Lab.; Schlafer, Nicholas J. [Pacific Northwest National Lab. (PNNL), Sequim, WA (United States). Marine Sciences Lab.; Tsouris, Costas [Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Environmental Sciences Division; Ladshaw, Austin [Georgia Inst. of Technology, Atlanta, GA (United States); Yiacoumi, Sotira [Georgia Inst. of Technology, Atlanta, GA (United States)

    2015-12-01

    The Fuel Resources Program at the U.S. Department of Energy’s (DOE), Office of Nuclear Energy (DOE-NE) is developing adsorbent technology to extract uranium from seawater. This technology is being developed to provide a sustainable and economically viable supply of uranium fuel for nuclear reactors (DOE, 2010). Among the key environmental variables to understand for adsorbent deployment in the coastal ocean is what effect flow-rates or linear velocity has on uranium adsorption capacity. The goal is to find a flow conditions that optimize uranium adsorption capacity in the shortest exposure time. Understanding these criteria will be critical in choosing a location for deployment of a marine adsorbent farm. The objective of this study was to identify at what linear velocity the adsorption kinetics for uranium extraction starts to drop off due to limitations in mass transport of uranium to the surface of the adsorbent fibers. Two independent laboratory-based experimental approaches using flow-through columns and recirculating flumes for adsorbent exposure were used to assess the effect of flow-rate (linear velocity) on the kinetic uptake of uranium on amidoxime-based polymeric adsorbent material. Time series observations over a 56 day period were conducted with flow-through columns over a 35-fold range in linear velocity from 0.29 to 10.2 cm/s, while the flume study was conducted over a narrower 11-fold range, from 0.48 to 5.52 cm/s. These ranges were specifically chosen to focus on the lower end of oceanic currents and expand above and below the linear velocity of ~ 2.5 cm/s adopted for marine testing of adsorbent material at PNNL.

  19. The Europa Imaging System (EIS): Investigating Europa's geology, ice shell, and current activity

    Science.gov (United States)

    Turtle, Elizabeth; Thomas, Nicolas; Fletcher, Leigh; Hayes, Alexander; Ernst, Carolyn; Collins, Geoffrey; Hansen, Candice; Kirk, Randolph L.; Nimmo, Francis; McEwen, Alfred; Hurford, Terry; Barr Mlinar, Amy; Quick, Lynnae; Patterson, Wes; Soderblom, Jason

    2016-07-01

    NASA's Europa Mission, planned for launch in 2022, will perform more than 40 flybys of Europa with altitudes at closest approach as low as 25 km. The instrument payload includes the Europa Imaging System (EIS), a camera suite designed to transform our understanding of Europa through global decameter-scale coverage, topographic and color mapping, and unprecedented sub- meter-scale imaging. EIS combines narrow-angle and wide-angle cameras to address these science goals: • Constrain the formation processes of surface features by characterizing endogenic geologic structures, surface units, global cross-cutting relationships, and relationships to Europa's subsurface structure and potential near-surface water. • Search for evidence of recent or current activity, including potential plumes. • Characterize the ice shell by constraining its thickness and correlating surface features with subsurface structures detected by ice penetrating radar. • Characterize scientifically compelling landing sites and hazards by determining the nature of the surface at scales relevant to a potential lander. EIS Narrow-angle Camera (NAC): The NAC, with a 2.3°° x 1.2°° field of view (FOV) and a 10-μμrad instantaneous FOV (IFOV), achieves 0.5-m pixel scale over a 2-km-wide swath from 50-km altitude. A 2-axis gimbal enables independent targeting, allowing very high-resolution stereo imaging to generate digital topographic models (DTMs) with 4-m spatial scale and 0.5-m vertical precision over the 2-km swath from 50-km altitude. The gimbal also makes near-global (>95%) mapping of Europa possible at ≤50-m pixel scale, as well as regional stereo imaging. The NAC will also perform high-phase-angle observations to search for potential plumes. EIS Wide-angle Camera (WAC): The WAC has a 48°° x 24°° FOV, with a 218-μμrad IFOV, and is designed to acquire pushbroom stereo swaths along flyby ground-tracks. From an altitude of 50 km, the WAC achieves 11-m pixel scale over a 44-km

  20. How Do Clinicians Learn About Knowledge Translation? An Investigation of Current Web-Based Learning Opportunities.

    Science.gov (United States)

    Damarell, Raechel A; Tieman, Jennifer J

    2017-07-13

    Clinicians are important stakeholders in the translation of well-designed research evidence into clinical practice for optimal patient care. However, the application of knowledge translation (KT) theories and processes may present conceptual and practical challenges for clinicians. Online learning platforms are an effective means of delivering KT education, providing an interactive, time-efficient, and affordable alternative to face-to-face education programs. This study investigates the availability and accessibility of online KT learning opportunities for health professionals. It also provides an analysis of the types of resources and associated disciplines retrieved by a range of KT synonyms. We searched a range of bibliographic databases and the Internet (Google advanced option) using 9 KT terms to identify online KT learning resources. To be eligible, resources had to be free, aimed at clinicians, educational in intent, and interactive in design. Each term was searched using two different search engines. The details of the first 100 websites captured per browser (ie, n=200 results per term) were entered into EndNote. Each site was subsequently visited to determine its status as a learning resource. Eligible websites were appraised for quality using the AACODS (Authority, Accuracy, Coverage, Objectivity, Date, Significance) tool. We identified 971 unique websites via our multiple search strategies. Of these, 43 were health-related and educational in intent. Once these sites were evaluated for interactivity, a single website matched our inclusion criteria (Dementia Knowledge Translation Learning Centre). KT is an important but complex system of processes. These processes overlap with knowledge, practice, and improvement processes that go by a range of different names. For clinicians to be informed and competent in KT, they require better access to free learning opportunities. These resources should be designed from the viewpoint of the clinician, presenting KT

  1. The role of high-resolution geomagnetic field models for investigating ionospheric currents at low Earth orbit satellites

    Science.gov (United States)

    Stolle, Claudia; Michaelis, Ingo; Rauberg, Jan

    2016-07-01

    Low Earth orbiting geomagnetic satellite missions, such as the Swarm satellite mission, are the only means to monitor and investigate ionospheric currents on a global scale and to make in situ measurements of F region currents. High-precision geomagnetic satellite missions are also able to detect ionospheric currents during quiet-time geomagnetic conditions that only have few nanotesla amplitudes in the magnetic field. An efficient method to isolate the ionospheric signals from satellite magnetic field measurements has been the use of residuals between the observations and predictions from empirical geomagnetic models for other geomagnetic sources, such as the core and lithospheric field or signals from the quiet-time magnetospheric currents. This study aims at highlighting the importance of high-resolution magnetic field models that are able to predict the lithospheric field and that consider the quiet-time magnetosphere for reliably isolating signatures from ionospheric currents during geomagnetically quiet times. The effects on the detection of ionospheric currents arising from neglecting the lithospheric and magnetospheric sources are discussed on the example of four Swarm orbits during very quiet times. The respective orbits show a broad range of typical scenarios, such as strong and weak ionospheric signal (during day- and nighttime, respectively) superimposed over strong and weak lithospheric signals. If predictions from the lithosphere or magnetosphere are not properly considered, the amplitude of the ionospheric currents, such as the midlatitude Sq currents or the equatorial electrojet (EEJ), is modulated by 10-15 % in the examples shown. An analysis from several orbits above the African sector, where the lithospheric field is significant, showed that the peak value of the signatures of the EEJ is in error by 5 % in average when lithospheric contributions are not considered, which is in the range of uncertainties of present empirical models of the EEJ.

  2. Investigations of Beam Dynamics Issues at Current and Future Hadron Accelerators

    Energy Technology Data Exchange (ETDEWEB)

    Ellison, James [Univ. of New Mexico, Albuquerque, NM (United States); Lau, Stephen [Univ. of New Mexico, Albuquerque, NM (United States); Heinemann, Klaus [Univ. of New Mexico, Albuquerque, NM (United States); Bizzozero, David [Univ. of New Mexico, Albuquerque, NM (United States)

    2015-03-12

    Final Report Abstract for DE-FG02-99ER4110, May 15, 2011- October 15, 2014 There is a synergy between the fields of Beam Dynamics (BD) in modern particle accelerators and Applied Mathematics (AMa). We have formulated significant problems in BD and have developed and applied tools within the contexts of dynamical systems, topological methods, numerical analysis and scientific computing, probability and stochastic processes, and mathematical statistics. We summarize the three main areas of our AMa work since 2011. First, we continued our study of Vlasov-Maxwell systems. Previously, we developed a state of the art algorithm and code (VM3@A) to calculate coherent synchrotron radiation in single pass systems. In this cycle we carefully analyzed the major expense, namely the integral-over-history (IOH), and developed two approaches to speed up integration. The first strategy uses a representation of the Bessel function J0 in terms of exponentials. The second relies on “local sequences” developed recently for radiation boundary conditions, which are used to reduce computational domains. Although motivated by practicality, both strategies involve interesting and rather deep analysis and approximation theory. As an alternative to VM3@A, we are integrating Maxwell’s equations by a time-stepping method, bypass- ing the IOH, using a Discontinuous Galerkin (DG) method. DG is a generalization of Finite Element and Finite Volume methods. It is spectrally convergent, unlike the commonly used Finite Difference methods, and can handle complicated vacuum chamber geometries. We have applied this in several contexts and have obtained very nice results including an explanation of an experiment at the Canadian Light Source, where the geometry is quite complex. Second, we continued our study of spin dynamics in storage rings. There is much current and proposed activity where spin polarized beams are being used in testing the Standard Model and its modifications. Our work has focused

  3. Investigations of Beam Dynamics Issues at Current and Future Hadron Accelerators

    Energy Technology Data Exchange (ETDEWEB)

    Ellison, James [Univ. of New Mexico, Albuquerque, NM (United States); Lau, Stephen [Univ. of New Mexico, Albuquerque, NM (United States); Heinemann, Klaus [Univ. of New Mexico, Albuquerque, NM (United States); Bizzozero, David [Univ. of New Mexico, Albuquerque, NM (United States)

    2015-03-12

    Final Report Abstract for DE-FG02-99ER4110, May 15, 2011- October 15, 2014 There is a synergy between the fields of Beam Dynamics (BD) in modern particle accelerators and Applied Mathematics (AMa). We have formulated significant problems in BD and have developed and applied tools within the contexts of dynamical systems, topological methods, numerical analysis and scientific computing, probability and stochastic processes, and mathematical statistics. We summarize the three main areas of our AMa work since 2011. First, we continued our study of Vlasov-Maxwell systems. Previously, we developed a state of the art algorithm and code (VM3@A) to calculate coherent synchrotron radiation in single pass systems. In this cycle we carefully analyzed the major expense, namely the integral-over-history (IOH), and developed two approaches to speed up integration. The first strategy uses a representation of the Bessel function J0 in terms of exponentials. The second relies on “local sequences” developed recently for radiation boundary conditions, which are used to reduce computational domains. Although motivated by practicality, both strategies involve interesting and rather deep analysis and approximation theory. As an alternative to VM3@A, we are integrating Maxwell’s equations by a time-stepping method, bypass- ing the IOH, using a Discontinuous Galerkin (DG) method. DG is a generalization of Finite Element and Finite Volume methods. It is spectrally convergent, unlike the commonly used Finite Difference methods, and can handle complicated vacuum chamber geometries. We have applied this in several contexts and have obtained very nice results including an explanation of an experiment at the Canadian Light Source, where the geometry is quite complex. Second, we continued our study of spin dynamics in storage rings. There is much current and proposed activity where spin polarized beams are being used in testing the Standard Model and its modifications. Our work has focused

  4. Experimental investigations of electric current under transverse and longitudinal electric field in uniaxially deformed p-Ge

    Science.gov (United States)

    Abramov, A. A.; Akimov, V. I.; Dalakyan, A. T.; Tulupenko, Victor N.; Zaitsev, A. M.; Danilov, S. N.; Firsov, D. A.; Shalygin, V. A.

    1999-11-01

    Comparison between cases of longitudinal and transverse directions of uniaxial pressure and strong electric field, affected the bulk hole germanium, to use it for lasting in far IR region has been carried out. Conclusion about preference of crossed directions is made. Threshold pressure, at which stimulated radiation arises, independence of crystallographic direction, along which external influences are applied, is also discussed. The results of experimental investigations of the crossed directions of uniaxial pressure and electric current are given.

  5. In situ transmission electron microscopy investigation of the structural changes in carbon nanotubes during electron emission at high currents

    Energy Technology Data Exchange (ETDEWEB)

    Doytcheva, Maya [Philips Research, Professor Holstlaan 4, 5656 AA Eindhovene (Netherlands); Kaiser, Monja [Philips Research, Professor Holstlaan 4, 5656 AA Eindhoven (Netherlands); Jonge, Niels de [Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak Ridge, TN 37831-6030 (United States)

    2006-07-14

    The structural changes in carbon nanotubes under electron emission conditions were investigated in situ in a transmission electron microscope (TEM). The measurements were performed on individually mounted free-standing multi-walled carbon nanotubes (CNTs). It was found that the structure of the carbon nanotubes did not change gradually, as is the case with field emission electron sources made of sharp metal tips. Instead, changes occurred only above a current level of a few microamperes, which was different for each nanotube. Above the threshold current, carbon nanotubes underwent either structural damage, such as shortening and splitting of the apex of the nanotube, or closing of their open cap. The results are discussed on the basis of several models for degradation mechanisms.

  6. In situ Transmission Electron Microscopy Investigation of the Structural Changes in Carbon Nanotubes During Electron Emission at High Currents

    Energy Technology Data Exchange (ETDEWEB)

    Doytcheva, Maya [Philips Research, The Netherlands; Kaiser, Monja [Philips Research, The Netherlands; De Jonge, Niels [ORNL

    2006-01-01

    The structural changes in carbon nanotubes under electron emission conditions were investigated in situ in a transmission electron microscope (TEM). The measurements were performed on individually mounted free-standing multi-walled carbon nanotubes (CNTs). It was found that the structure of the carbon nanotubes did not change gradually, as is the case with field emission electron sources made of sharp metal tips. Instead, changes occurred only above a current level of a few microamperes, which was different for each nanotube. Above the threshold current, carbon nanotubes underwent either structural damage, such as shortening and splitting of the apex of the nanotube, or closing of their open cap. The results are discussed on the basis of several models for degradation mechanisms.

  7. Numerical Investigation of Flow Motion and Performance of A Horizontal Axis Tidal Turbine Subjected to A Steady Current

    Institute of Scientific and Technical Information of China (English)

    李林娟; 郑金海; 彭于轩; 张继生; 吴修广

    2015-01-01

    Horizontal axis tidal turbines have attracted more and more attentions nowadays, because of their convenience and low expense in construction and high efficiency in extracting tidal energy. The present study numerically investigates the flow motion and performance of a horizontal axis tidal turbine with a supporting vertical cylinder under steady current. In the numerical model, the continuous equation and incompressible Reynolds-averaged Navier-Stokes equations are solved, and the volume of fluid method is employed to track free surface motion. The RNG k-εmodel is adopted to calculate turbulence transport while the fractional area/volume obstacle representation method is used to describe turbine characteristics and movement. The effects of installation elevation of tidal turbine and inlet velocity on the water elevation, and current velocity, rotating speed and resultant force on turbine are discussed. Based on the comparison of the numerical results, a better understanding of flow structure around horizontal axis tidal turbine and turbine performance is achieved.

  8. Investigation of local tunneling current noise spectra on the silicon crystal surfaces by means of STM/STS

    Energy Technology Data Exchange (ETDEWEB)

    Mantsevich, V. N., E-mail: vmantsev@spmlab.phys.msu.su; Maslova, N. S. [Moscow State University, Department of Physics (Russian Federation); Cao, G. Y. [Chinese Academy of Sciences, Wuhan Institute of Physics and Mathematics (China)

    2015-08-15

    We report on a careful analysis of the local tunneling conductivity by means of ultra-high vacuum scanning tunneling microscopy/spectroscopy (STM/STS) technique in the vicinity of low-dimensional structures on the Si(111)–(7 × 7) and Si(110)–(16 × 2) surfaces. The power-law exponent α of low-frequency tunneling current noise spectra is investigated for different values of the tunneling contact parameters: relaxation rates, the localized state coupling, and the tunneling barrier width and height.

  9. Investigation of the current yaw engineering models for simulation of wind turbines in BEM and comparison with CFD and experiment

    Science.gov (United States)

    Rahimi, H.; Hartvelt, M.; Peinke, J.; Schepers, J. G.

    2016-09-01

    The aim of this work is to investigate the capabilities of current engineering tools based on Blade Element Momentum (BEM) and free vortex wake codes for the prediction of key aerodynamic parameters of wind turbines in yawed flow. Axial induction factor and aerodynamic loads of three wind turbines (NREL VI, AVATAR and INNWIND.EU) were investigated using wind tunnel measurements and numerical simulations for 0 and 30 degrees of yaw. Results indicated that for axial conditions there is a good agreement between all codes in terms of mean values of aerodynamic parameters, however in yawed flow significant deviations were observed. This was due to unsteady phenomena such as advancing & retreating and skewed wake effect. These deviations were more visible in aerodynamic parameters in comparison to the rotor azimuthal angle for the sections at the root and tip where the skewed wake effect plays a major role.

  10. Investigation of current transport parameters of Ti/4H-SiC MPS diode with inhomogeneous barrier

    Institute of Scientific and Technical Information of China (English)

    Song Qing-Wen; Zhang Yu-Ming; Zhang Yi-Men; Chen Feng-Ping; Tang xiao-Yan

    2011-01-01

    The current transport parameters of 4H-SiC merged PiN Schottky (MPS) diode are investigated in a temperature range of 300-520 K. Evaluation of the experimental current-voltage (Ⅰ-Ⅴ) data reveals the decrease in Schottky barrier height φb but an increase in ideality factor n, with temperature decreasing, which suggests the presence of an inhomogeneous Schottky barrier. The current transport behaviours are analysed in detail using the Tung's model and the effective area of the low barrier patches is extracted. It is found that small low barrier patches, making only 4.3% of the total contact, may significantly influence the device electrical characteristics due to the fact that a barrier height of 0.968 eV is much lower than the average barrier height 1.39 eV. This shows that ion implantation in the Schottky contact region of MPS structure may result in a poor Ti/4H-SiC interface quality. In addition, the temperature dependence of the specific on-resistance (Ron-sp), T2.14, is determined between 300 K and 520 K, which is similar to that predicted by a reduction in electron mobility.

  11. An investigation of environmental factors associated with the current and proposed jetty systems at Belle Pass, Louisiana

    Science.gov (United States)

    Dantin, E. J.; Whitehurst, C. A.; Durbin, W. T.

    1974-01-01

    The history of the existing jetty system at Belle Pass was investigated to determine its past effect on the littoral currents and beach erosion. Present flow patterns and erosion rates were also studied, along with the prevailing recession rates of local beaches not influenced by the jetty system. Aerial photographs and maps were used in conjunction with periodic hydraulic measurements, ground observations, and physical measurements of beach erosion. A scale model was constructed to further the study of flow patterns and velocities. It is shown that the existing jetty has not adversely affected the coastline in the area; erosive processes have been retarded by the jetty and its companion groin. Future erosion patterns are predicted, and projected effects of the proposed jetty system are given.

  12. Investigation of the current requirements engineering practices among software developers at the Universiti Utara Malaysia Information Technology (UUMIT) centre

    Science.gov (United States)

    Hussain, Azham; Mkpojiogu, Emmanuel O. C.; Abdullah, Inam

    2016-08-01

    Requirements Engineering (RE) is a systemic and integrated process of eliciting, elaborating, negotiating, validating and managing of the requirements of a system in a software development project. UUM has been supported by various systems developed and maintained by the UUM Information Technology (UUMIT) Centre. The aim of this study was to assess the current requirements engineering practices at UUMIT. The main problem that prompted this research is the lack of studies that support software development activities at the UUMIT. The study is geared at helping UUMIT produce quality but time and cost saving software products by implementing cutting edge and state of the art requirements engineering practices. Also, the study contributes to UUM by identifying the activities needed for software development so that the management will be able to allocate budget to provide adequate and precise training for the software developers. Three variables were investigated: Requirement Description, Requirements Development (comprising: Requirements Elicitation, Requirements Analysis and Negotiation, Requirements Validation), and Requirement Management. The results from the study showed that the current practice of requirement engineering in UUMIT is encouraging, but still need further development and improvement because a few RE practices were seldom practiced.

  13. Simulation and mechanistic investigation of the arrhythmogenic role of the late sodium current in human heart failure.

    Directory of Open Access Journals (Sweden)

    Beatriz Trenor

    Full Text Available Heart failure constitutes a major public health problem worldwide. The electrophysiological remodeling of failing hearts sets the stage for malignant arrhythmias, in which the role of the late Na(+ current (I(NaL is relevant and is currently under investigation. In this study we examined the role of I(NaL in the electrophysiological phenotype of ventricular myocytes, and its proarrhythmic effects in the failing heart. A model for cellular heart failure was proposed using a modified version of Grandi et al. model for human ventricular action potential that incorporates the formulation of I(NaL. A sensitivity analysis of the model was performed and simulations of the pathological electrical activity of the cell were conducted. The proposed model for the human I(NaL and the electrophysiological remodeling of myocytes from failing hearts accurately reproduce experimental observations. The sensitivity analysis of the modulation of electrophysiological parameters of myocytes from failing hearts due to ion channels remodeling, revealed a role for I(NaL in the prolongation of action potential duration (APD, triangulation of the shape of the AP, and changes in Ca(2+ transient. A mechanistic investigation of intracellular Na(+ accumulation and APD shortening with increasing frequency of stimulation of failing myocytes revealed a role for the Na(+/K(+ pump, the Na(+/Ca(2+ exchanger and I(NaL. The results of the simulations also showed that in failing myocytes, the enhancement of I(NaL increased the reverse rate-dependent APD prolongation and the probability of initiating early afterdepolarizations. The electrophysiological remodeling of failing hearts and especially the enhancement of the I(NaL prolong APD and alter Ca(2+ transient facilitating the development of early afterdepolarizations. An enhanced I(NaL appears to be an important contributor to the electrophysiological phenotype and to the dysregulation of [Ca(2+](i homeostasis of failing myocytes.

  14. Holistic Investigation of Corona Discharge: Impulse Current Waveform and Phase-resolved Measurement, Analysis and Simulation%Holistic Investigation of Corona Discharge: Impulse Current Waveform and Phase-resolved Measurement, Analysis and Simulation

    Institute of Scientific and Technical Information of China (English)

    Suwarno

    2011-01-01

    Partial discharge(PD) is one of the most important phenomenon in high voltage insulations. In most cases, the appearance of partial discharges is related to insulation defects. Understanding partial discharges is important for diagnosis on insulation condition. Corona discharges appear when extremely high electric field appears on the conductor surface exceeding the electric field strength of the gas. The high electric field may occur at around protrusion with very sharp tip. This paper reported a holistic approach of corona discharge investigation. The needle--plane electrode system was used. The medium between the electrodes was air. The needle was made from steel with radius of curvature of 3 μm (Ogura needle). Sinusoidal as well as triangular applied voltages were used. The waveform of the corona discharges was measured using a digital oscilloscope. The corona discharge pulses were measured using a phase--re- solved PD measurement system. The system was able to measure the magnitude (q) and phase angle position (9) of each PD pulses, as well as the number of discharge pulses (n). The role of applied voltage was investigated using phase--resolved analysis of corona discharge pulses through pulse sequence, pulse magnitude and pulse number analy- sis. Experimental results indicated that corona discharge current waveform was an impulse with rise time of about several ns and the impulse width of about 100 ns. The Fast Fourier Transform analysis indicated that the corona discharge current waveform had several spectrum peaks at frequency of 7.8 MHz, 85.9 MHz, 109.4 MHz and 195.3 MHz. The experimental results also showed that discharge pulses were concentrated around the peak of applied voltage for both sinusoidal and triangular voltages. The discharge magnitude, as well as its probability of occurrence, was strongly dependent on the instantaneous applied voltage. The shape of φn, as well as φ-q-n PD patterns, were strongly reflected by the shape

  15. An Investigation into Customer Service Policies and Practices within the Scottish College Library Sector: A Comparison between the Customer Service Exemplars from the Retail Sector with Current Scottish College Library Practice

    Science.gov (United States)

    Paterson, Neil

    2011-01-01

    The aim of this research project was to investigate the customer care methods within the Scottish college library sector. The researcher sought to compare examples of the customer care and service policies and practices from the sector with exemplars of good customer service from the retail sector. A qualitative, grounded theory approach was…

  16. An Investigation into Customer Service Policies and Practices within the Scottish College Library Sector: A Comparison between the Customer Service Exemplars from the Retail Sector with Current Scottish College Library Practice

    Science.gov (United States)

    Paterson, Neil

    2011-01-01

    The aim of this research project was to investigate the customer care methods within the Scottish college library sector. The researcher sought to compare examples of the customer care and service policies and practices from the sector with exemplars of good customer service from the retail sector. A qualitative, grounded theory approach was…

  17. The Investigation of Separability of Particles Smaller Than 5 mm by Eddy Current Separation Technology. Part I: Rotating Type Eddy Current Separators

    NARCIS (Netherlands)

    Zhang, S.; Rem, P.C.; Forssberg, E.

    1999-01-01

    Owing to the growing emergence of the end-of-life electrical and electronic products with complex material structures and an ever-diminishing particle size of the valuable metals involved, development of eddy current separators (ECS) has been targeting selective separation of small non-ferrous metal

  18. Investigation of the effects of transcranial alternating current stimulation (tACS) on self-paced rhythmic movements.

    Science.gov (United States)

    Varlet, Manuel; Wade, Alanna; Novembre, Giacomo; Keller, Peter E

    2017-03-18

    Human rhythmic movements spontaneously entrain to external rhythmic stimuli. Such sensory-motor entrainment can attract movements to different tempi and enhance their efficiency, with potential clinical applications for motor rehabilitation. Here we investigate whether entrainment of self-paced rhythmic movements can be induced via transcranial alternating current stimulation (tACS), which uses alternating currents to entrain spontaneous brain oscillations at specific frequencies. Participants swung a handheld pendulum at their preferred tempo with the right hand while tACS was applied over their left or right primary motor cortex at frequencies equal to their preferred tempo (Experiment 1) or in the alpha (10Hz) and beta (20Hz) ranges (Experiment 2). Given that entrainment generally occurs only if the frequency difference between two rhythms is small, stimulations were delivered at frequencies equal to participants' preferred movement tempo (≈1Hz) and ±12.5% in Experiment 1, and at 10Hz and 20Hz, and ±12.5% in Experiment 2. The comparison of participants' movement frequency, amplitude, variability, and phase synchrony with and without tACS failed to reveal entrainment or movement modifications across the two experiments. However, significant differences in stimulation-related side effects reported by participants were found between the two experiments, with phosphenes and burning sensations principally occurring in Experiment 2, and metallic tastes reported marginally more often in Experiment 1. Although other stimulation protocols may be effective, our results suggest that rhythmic movements such as pendulum swinging or locomotion that are low in goal-directedness and/or strongly driven by peripheral and mechanical constraints may not be susceptible to modulation by tACS.

  19. Water Sensitive Urban Design: An Investigation of Current Systems, Implementation Drivers, Community Perceptions and Potential to Supplement Urban Water Services

    Directory of Open Access Journals (Sweden)

    Ashok K. Sharma

    2016-06-01

    Full Text Available Large scale centralised water, wastewater and stormwater systems have been implemented for over 100 years. These systems have provided a safe drinking water supply, efficient collection and disposal of wastewater to protect human health, and the mitigation of urban flood risk. The sustainability of current urban water systems is under pressure from a range of challenges which include: rapid population growth and resulting urbanisation, climate change impacts, and infrastructure that is ageing and reaching capacity constraints. To address these issues, urban water services are now being implemented with Integrated Urban Water Management (IUWM and Water Sensitive Urban Design (WSUD approaches. WSUD systems can deliver multiple benefits including water conservation, stormwater quality improvement, flood control, landscape amenity and a healthy living environment. These systems can be provided as stand-alone systems or in combination with centralised systems. These systems are still novel and thus face knowledge gaps that are impeding their mainstream uptake. Knowledge gaps cover technical, economic, social, and institutional aspects of their implementation. This paper is based on the outcomes of a comprehensive study conducted in South Australia which investigated impediments for mainstream uptake of WSUD, community perceptions of WSUD and potential of WSUD to achieve water conservation through the application of alternative resources, and in flood management. The outcomes are discussed in this paper for the benefit of water professionals engaged with WSUD planning, implementation, community consultation and regulation. Although the paper is based on a study conducted in South Australia, the comprehensive framework developed to conduct this detailed study and investigation can be adopted in any part of the world.

  20. Experimental Investigation of an Automobile Air-Conditioning System using Integrated Brushless Direct Current Motor Rotary Compressor

    Directory of Open Access Journals (Sweden)

    Sukri M.F.

    2016-01-01

    Full Text Available The present study presents an experimental investigation on the effect of condenser air inlet temperature and dimensionless parameter of X on the performance of automobile air-conditioning (AAC system using integrated brushless direct current motor-rotary compressor and electronic expansion valve. The other components of AAC system are from original component of AAC system used for medium size passenger car. The experimental results showed that the increment of the condenser air inlet temperature and X caused an increase in condensing temperature, cooling capacity and compressor work, while decreasing the coefficient of performance (COP. Meanwhile, the evaporating temperature increase with the increment of condenser air inlet temperature, but decrease with decrement of X. In general, AAC system have to work at higher value of X in order to produce more cooling capacity, thereby increment in compressor work also occurs due to energy balance. However, at higher value of X, the COP of the system dropped due to dominant increase in compressor power, as opposed to a rise in cooling capacity. Due to this reason, the best operation of this compressor occurs at X = 4.96 for constant T5 (35ºC, or at T5 = 30ºC for constant X (4.96.

  1. Investigation of Line Current Harmonics in Cascaded Multi-level Inverter Based Induction Motor Drive and an Adaptive On-line Selective Current Harmonic Elimination Algorithm

    Directory of Open Access Journals (Sweden)

    P. Avirajamanjula

    2015-03-01

    Full Text Available Multilevel Inverters (MLIs have drawn increasing attention in numerous applications, especially in drives, distributed energy resources area, utility etc. MLIs have the ability to synthesize a near sinusoidal output voltage wave with minimal Total Harmonic Distortion (THD in low frequency switching. Even though they offer lower THD, the presence of lower order harmonics is objectionable and harmonics elimination in Multilevel Inverters (MLIs has been receiving immense attention for the past few decades. Existing Selective Harmonic Elimination (SHE techniques can eliminate the objectionable lower order voltage harmonics with low switching frequency by solving the Fourier non-linear transcendental equations of the output voltage. The line current harmonics has a direct role to play on the magneto-motive force and results in increase of mismatching of air-gap permeance, vibrations, acoustic noise etc. This study proposes Normalized Least Mean Squares (NLMS algorithm based scheme to eliminate the selected dominant harmonics in load current using only the knowledge of the frequencies to be eliminated. The algorithm is simulated using MATLAB/SIMULINK tool for a three-phase VSI to eliminate the fifth and seventh harmonics. The informative simulation results verify the validity and effectiveness of the proposed algorithm. The system performance is analyzed based on the simulation results considering Total Harmonic Distortion (THD, magnitude of eliminated harmonics and frequency spectrum.

  2. 75 FR 28249 - Comment Sought on Measures Designed To Assist U.S. Wireless Consumers To Avoid “Bill Shock”

    Science.gov (United States)

    2010-05-20

    ... COMMISSION Comment Sought on Measures Designed To Assist U.S. Wireless Consumers To Avoid ``Bill Shock... these provisions, commonly referred to as the ``bill shock'' provisions, are designed to ensure that a... implemented procedures to combat the problem of ``bill shock'' prior to the adoption of the June...

  3. Field Investigations of the July 2015 Pyroclastic Density Current Deposits of Volcán de Colima, Mexico

    Science.gov (United States)

    Atlas, Z. D.; Macorps, E.; Charbonnier, S. J.; Varley, N. R.

    2016-12-01

    Small-volume pyroclastic density currents (PDCs) occur relatively frequently and pose severe threats to surrounding populations and infrastructures at active explosive volcanoes. They are characterized by short duration and complex multiphase flow dynamics due to time and space variability in their properties, which include amongst others, particle concentration, granulometry, componentry, bulk rheology and velocity. Field investigations of the deposits emplaced by small-volume concentrated PDCs aim to improve our understanding of the transport and depositional processes of these flows: time and space variations in flow dynamics within a PDC moving downslope will reflect on the distribution, grainsize and component characteristics of its deposits. Our study focuses on the recent events of July 10th and 11th, 2015 at Volcán de Colima (Mexico) where the collapse of the recent lava dome complex and a portion of the southern crater rim led to the emplacement of successive pulses of small-volume concentrated PDCs on the southern flank, along the Montegrande and San Antonio ravines. A 3-dimensional field analysis of the PDCs' deposit architecture, total grain size distribution and component properties together with a geomorphic analysis of the affected ravines provide new insights on the lateral and vertical variations of flow dynamics for some of these small-volume concentrated PDCs. Preliminary results reveal three stratigraphic units with massive block, lapilli, ash facies within the valley confined and concentrated overbank deposits with increasing content in fines with distance from the summit, suggesting an increase in fragmentation processes within the PDCs. The middle unit is characterized by a finer grainsize, a higher accidental lithic content and a lower free crystal content. Moreover, direct correlations are found between rapid changes in channel morphology and generation of overbank (unconfined) flows that escaped valley confines, which could provide the

  4. Horton Research Grant posposals sought

    Science.gov (United States)

    The American Geophysical Union is requesting proposals for the award of the Horton Research Grant. The proposal deadline is March 15, 1984. The grant will be in support of research projects in hydrology and water resources by Ph.D. candidates of American institutions of higher education and is awarded annually to a single proponent. Its objective is to foster graduate student research leading to the completion of doctoral dissertations. Proposals may be in hydrology (including its physical, chemical, or biological aspects) or in the water resource policy sciences (including economics, systems analysis, sociology, and law).

  5. Predicting Internet risks: a longitudinal panel study of gratifications-sought, Internet addiction symptoms, and social media use among children and adolescents.

    Science.gov (United States)

    Leung, Louis

    2014-01-01

    This study used longitudinal panel survey data collected from 417 adolescents at 2 points in time 1 year apart. It examined relationships between Internet risks changes in Time 2 and social media gratifications-sought, Internet addiction symptoms, and social media use all measured at Time 1. By controlling for age, gender, education, and criterion variable scores in Internet addiction at Time 1, entertainment and instant messaging use at Time 1 significantly predicted increased Internet addiction measured at Time 2. The study also controlled for demographics and scores of criterion variables in Internet risks: targeted for harassment, privacy exposed, and pornographic or violent content consumed in Time 1. Gratifications-sought (including status-gaining, expressing opinions, and identity experimentation), Internet addiction symptoms (including withdrawal and negative life consequences), and social media use (in particular, blogs, and Facebook) significantly predicted Internet risk changes in Time 2. These findings suggest that, with their predictive power, these predictors at Time 1 could be used to identify those adolescents who are likely to develop Internet addiction symptoms and the likelihood of experiencing Internet risks based on their previous gratifications-sought, previous addiction symptoms, and their habits of social media use at Time 1.

  6. Investigation of heavy ions diffusion under the influence of current-driven mechanism and compositional waves in plasma

    CERN Document Server

    Urpin, Vadim

    2016-01-01

    We consider diffusion caused by a combined influence of the Hall effect and electric currents, and argue that such diffusion forms chemical inhomogeneities in plasma. The considered mechanism can be responsible for the formation of element spots in laboratory and astrophysical plasmas. Such current-driven diffusion can be accompanied by the propagation of a particular type of waves which have not been considered earlier. In these waves, the impurity number density oscillare alone and their frequency is determined by the electric currents and sort of impurity ions. These compositional waves exist if the magnetic pressure in plasma is much greater than the gas pressure. Such waves lead to local variations of chemical composition and, hence, can manifest themselves by variations of the emission in spectral lines.

  7. Investigating Relationships among Pre-Service Science Teachers' Conceptual Knowledge of Electric Current, Motivational Beliefs and Self-Regulation

    Science.gov (United States)

    Inaltun, Hüseyin; Ates, Salih

    2015-01-01

    The purpose of this study is to examine relationships among pre-service science teachers' conceptual knowledge of electric current, motivational beliefs, and self-regulation. One hundred and twenty-seven students (female = 107, male = 20) enrolled in the science education program of a public university in Ankara participated the study. A concept…

  8. Investigating Relationships among Pre-Service Science Teachers' Conceptual Knowledge of Electric Current, Motivational Beliefs and Self-Regulation

    Science.gov (United States)

    Inaltun, Hüseyin; Ates, Salih

    2015-01-01

    The purpose of this study is to examine relationships among pre-service science teachers' conceptual knowledge of electric current, motivational beliefs, and self-regulation. One hundred and twenty-seven students (female = 107, male = 20) enrolled in the science education program of a public university in Ankara participated the study. A concept…

  9. An experimental investigation of the dynamics of submarine leveed channel initiation as sediment-laden density currents experience sudden unconfinement

    Energy Technology Data Exchange (ETDEWEB)

    Rowland, Joel C [Los Alamos National Laboratory; Hilley, George E [STANFORD UNIV; Fildani, Andrea [CHEVRON ETC

    2009-01-01

    Leveed submarine channels play a critical role in the transfer of sediment from the upper continental slopes to interslope basins and ultimately deepwater settings. Despite a reasonable understanding of how these channels grow once established, how such channels initiate on previously unchannelized portions of the seafloor remains poorly understood. We conducted a series of experiments that elucidate the influence of excess density relative to flow velocity on the dynamics of, and depositional morphologies arising from, density currents undergoing sudden unconfinement across a sloped bed. Experimental currents transported only suspended sediment across a non-erodible substrate. Under flow conditions ranging from supercritical to subcritical (bulk Richardson numbers of 0.02 to 1.2) our experiments failed to produce deposits resembling or exhibiting the potential to evolve into self-formed leveed channels. In the absence of excess density, a submerged sediment-laden flow produced sharp crested lateral deposits bounding the margins of the flow for approximately a distance of two outlet widths down basin. These lateral deposits terminated in a centerline deposit that greatly exceeded marginal deposits in thickness. As excess density increased relative to the outlet velocity, the rate of lateral spreading of the flow increased relative to the downstream propagation of the density current, transitioning from a narrow flow aligned with the channel outlet to a broad radially expanding flow. Coincident with these changes in flow dynamics, the bounding lateral deposits extended for shorter distances, had lower, more poorly defined crests that were increasingly wider in separation than the initial outlet, and progressively became more oblong rather than linear. Based on our results, we conclude that leveed channels cannot initiate from sediment-laden density currents under strictly depositional conditions. Partial confinement of these currents appears to be necessary to

  10. Investigation of the Current Turn-off Characteristics of a GTO Thyristor in an Inductive Pulse Forming Network

    Science.gov (United States)

    2008-05-02

    pnp transistor (the top transistor in the figure) coupled to an npn transistor (the bottom transistor in the figure) such that the...collector of the pnp transistor connects to the base of the npn transistor and the collector of the npn transistor connects to the base of the pnp ... transistor . By design, a pnp P N P N N N N N N Cathode Anode Gate Base Unit Base Unit 12 transistor will conduct whenever current is

  11. Investigation of Current-Voltage Characteristics of Ni/GaN Schottky Barrier Diodes for Potential HEMT Applications

    Directory of Open Access Journals (Sweden)

    Ashish Kumar

    2011-01-01

    Full Text Available In the present work, the I-V characteristics of Ni/GaN Schottky diodes have been studied. The Schottky diodes, having different sizes using Ni/Au and ohmic contacts using Ti/Al/Ni/Au were made on n-GaN. The GaN was epitaxially grown on c-plane sapphire by metal organic chemical vapor deposition (MOCVD technique and had a thickness of about 3.7 µm. The calculated ideality factor and barrier height from current-voltage (I-V characteristics (at 300 K for two GaN Schottky diodes were close to ~1.3 and ~ 0.8 eV respectively. A high reverse leakage current in the order of 10 – 4A/cm2 (at – 1 V was observed in both diodes. A careful analysis of forward bias I-V characteristics showed very high series resistance and calculation for ideality factor indicated presence of other current transport mechanism apart from thermionic model at room temperature.

  12. 浅析《挪威的森林》中的迷失与寻找%The Analysis of the Lost and Sought in "The Norwegian Wood"

    Institute of Scientific and Technical Information of China (English)

    焦癑

    2016-01-01

    迷失与寻找一直被认为是村上春树作品的重要主题之一。迄今为止,有许多关于村上文学中迷失与寻找主题的文章,但大多是总体介绍或关于《寻羊冒险记》,具体到《挪威的森林》这部作品的并不多见,所以本文将结合《挪威的森林》内容,分析人物的迷失与寻找。探讨《挪威的森林》中的迷失与寻找,可以使我们进一步理解村上对现代年轻人生存困境的思考。%The lost and sought has been considered as one of the important themes of Haruki Murakami's works.So far,there are a lot of articles on it,but most of the studies focus on the general introduction of the"A Wild Sheep Chase",rather than on"The Norwegian Wood".Therefore,this paper aims to analysis the lost and sought of the characters,which is combined with the content of Norwegian Wood.Exploring the lost and the sought in "The Norwegian Wood"can make us understand Haruki's reflections of the survival predicament of the modern young people well.

  13. Investigating stakeholders' perceptions of the link between high STD rates and the current Baltimore City Public Schools' sex education curriculum

    Science.gov (United States)

    Bolden, Shenell L. T.

    The purpose of this exploratory study was to examine key stakeholders' perceptions of the current Baltimore City Public Schools' (BCPS) sex education curriculum and to gain insight into how they believe the curriculum could be modified to be more effective. A mixed methods approach using qualitative and quantitative data collection consisting of a survey, focus group interview, and individual interviews was conducted to gather information on stakeholders' perceptions. The stakeholders included: (1) former students who received their sex education courses in the Baltimore City Public School system (BCPS); (2) teachers in BCPS who were affiliated with the sex education curriculum; (3) health care professionals who screened and/or treated East Baltimore City residents for a sexually transmitted disease (STD) and; (4) one policy maker who was responsible for creating sex education curriculum at the national level. Analysis of the quantitative data from former Baltimore City Public School students revealed a general satisfaction with the current sex education curriculum. However, qualitative data from the same group of stakeholders revealed several changes they thought should be implemented into the program in an effort to improve the current curriculum. Findings from the other groups after qualitative analysis of the interviews suggest three major themes in support of curriculum change: (1) a blended curriculum that integrates both the cognitive and affective learning domains; (2) knowledge of prevention of STD's and pregnancy; and (3) authentic teaching and learning. Results from this study strongly suggest that the Baltimore City Public School system is apathetic to the sexual health needs of students and, therefore, is inadvertently contributing to the high rate of sexually transmitted diseases among young people. Keywords: Abstinence, Affective domain, Indoctrination, Behavior Modification, Cognitive domain, Sex education curriculum, Sexually Transmitted Diseases.

  14. Microdialysis sampling for investigations of bioavailability and bioequivalence of topically administered drugs: current state and future perspectives

    DEFF Research Database (Denmark)

    Holmgaard, R; Nielsen, J B; Benfeldt, E

    2010-01-01

    by skin disease or barrier perturbation. A comparison between MD and other tissue sampling techniques reveals the advantages and limitations of the method. Subsequently, an in-depth discussion of the application of MD for the evaluation of bioavailability and bioequivalence of topical formulations...... is concluded by the current regulatory point of view. The future perspective includes further expansion and validation of the use of MD in the experimental and clinical setting as well as in the optimization of the method for regulatory purposes, i.e. the commercialization of bioequivalent, generic drug...

  15. An Investigation of Carbon-Doping-Induced Current Collapse in GaN-on-Si High Electron Mobility Transistors

    Directory of Open Access Journals (Sweden)

    An-Jye Tzou

    2016-06-01

    Full Text Available This paper reports the successful fabrication of a GaN-on-Si high electron mobility transistor (HEMT with a 1702 V breakdown voltage (BV and low current collapse. The strain and threading dislocation density were well-controlled by 100 pairs of AlN/GaN superlattice buffer layers. Relative to the carbon-doped GaN spacer layer, we grew the AlGaN back barrier layer at a high temperature, resulting in a low carbon-doping concentration. The high-bandgap AlGaN provided an effective barrier for blocking leakage from the channel to substrate, leading to a BV comparable to the ordinary carbon-doped GaN HEMTs. In addition, the AlGaN back barrier showed a low dispersion of transiently pulsed ID under substrate bias, implying that the buffer traps were effectively suppressed. Therefore, we obtained a low-dynamic on-resistance with this AlGaN back barrier. These two approaches of high BV with low current collapse improved the device performance, yielding a device that is reliable in power device applications.

  16. Work Plan for a Limited CCC/USDA Investigation of the Current Carbon Tetrachloride Contamination in Groundwater at Navarre, Kansas

    Energy Technology Data Exchange (ETDEWEB)

    LaFreniere, Lorraine M. [Argonne National Lab. (ANL), Argonne, IL (United States)

    2014-05-01

    During private well testing in 1990-1991, carbon tetrachloride was identified in the groundwater at several locations in the town of Navarre, Kansas, at levels exceeding the Kansas Tier 2 level and U.S. Environmental Protection Agency (EPA) maximum contaminant level (MCL) of 5.0 μg/L. Several subsequent investigations through 2006 evaluated the concentrations and distribution of carbon tetrachloride in groundwater. This work included the identification of the contaminant sources (Argonne 2007). The history of activities to address the contamination in soil and groundwater is summarized in Table 1.1. The most recent studies, conducted by the Kansas Department of Health and Environment (KDHE), include a brownfields investigation initiated in 2013 (Phase I) and continuing in early 2014 (Phase II), as well as private well testing.

  17. Microdialysis sampling for investigations of bioavailability and bioequivalence of topically administered drugs: current state and future perspectives

    DEFF Research Database (Denmark)

    Holmgaard, R; Nielsen, J B; Benfeldt, E

    2010-01-01

    Microdialysis (MD) in the skin is a unique technique for in vivo sampling of topically as well as systemically administered drugs at the site of action, e.g. sampling the unbound tissue concentrations in the dermis and subcutaneous tissue. MD as a research method has undergone significant...... by skin disease or barrier perturbation. A comparison between MD and other tissue sampling techniques reveals the advantages and limitations of the method. Subsequently, an in-depth discussion of the application of MD for the evaluation of bioavailability and bioequivalence of topical formulations...... development, improvement and validation during the last decade and has proved to be a versatile, safe and valuable tool for pharmacokinetic and pharmacodynamic studies. This review gives an overview of the current state and future perspectives of dermal MD sampling. Methodological issues such as choice...

  18. Investigation of the Influence of Magnetospheric Sources of Field-Aligned Currents on the Equatorial Electric Fields

    Science.gov (United States)

    Beloushko, Konstantin; Knyazeva, Mariya

    The urgency of studying electrodynamic processes related to the influence of spatial and temporal heterogeneities of the electromagnetic field in the Earth's upper atmosphere to the functioning of modern technological systems , satellite navigation systems , radio propagation Fundamentally new is the use of various third-party electrodynamic models in the total open loop model of the atmosphere based on the Upper Atmosphere Model (UAM) [1,2]. Performing calculations on model UAM using different spatial and temporal distributions of field-aligned currents and brands Lukianova and Papitashvili. A comparison of model results with data Jicamarca Incoherent Scatter Radar (Peru). References begin{enumerate} Namgaladze A.A., Korenkov Yu.N., Klimenko V.V., Karpov I.V., Bessarab F.S., Surotkin V.A., Gluschenko T.A., Naumova N.M. Global model of the thermosphere-ionosphere-protonosphere system. Pure and Applied Geophysics. № 2/3, 127, 219-254, 1988. Namgaladze A.A., Martynenko O.V., Namgaladze A.N. Global model of the upper atmosphere with variable latitudinal steps of numerical integration, IUGG XXI General Assembly, Boulder, 1995, Abstracts, GAB41F-6, B150, 1995, and (in Russian) Geamagn. Aeron., 36, 89-95, 1996a.

  19. Structural investigation of direct current magnetron sputtered Ti/NiV/Ag layers on n{sup +}Si substrate

    Energy Technology Data Exchange (ETDEWEB)

    Resnik, D. [Laboratory of Microsensor Structures and Electronics, Faculty of Electrical Engineering, University of Ljubljana, Trzaska 25, Ljubljana 1000 (Slovenia)], E-mail: drago.resnik@fe.uni-lj.si; Kovac, J. [Jozef Stefan Institute, Jamova 36, Ljubljana 1000 (Slovenia); Vrtacnik, D.; Amon, S. [Laboratory of Microsensor Structures and Electronics, Faculty of Electrical Engineering, University of Ljubljana, Trzaska 25, Ljubljana 1000 (Slovenia)

    2008-09-01

    Direct current sputtered Ti/NiV/Ag thin film metallization scheme on n{sup +}Si substrate was studied to reveal the nature of interface structure and adhesion related mechanisms. Ti/NiV/Ag scheme is usually applied when solderable backside contact is required. When thermal annealing of this sputtered metallic stack is performed below 550 deg. C, delamination frequently occurs. By energy dispersive X-ray spectroscopy analysis the delaminating interface was found to be between Si and Ti layer. Auger electron spectroscopy (AES) and X-ray photoelectron spectroscopy (XPS) depth profile analyses through metallic stack/Si substrate on samples exhibiting poor adhesion showed that a very thin amorphous Ti-Si phase was grown at Ti/Si interface when annealed at 400 deg. C. The XPS analyses of peeled layer and the surface of remained Si substrate after adhesion failure show that the delamination occurs between Si-substrate and amorphous Ti-Si layer. No contamination at Ti/Si interface was found as a possible origin for adhesion degradation. AES depth profiling of samples having good adhesion and annealed at 550 deg. C, revealed the formation of Ti-silicide and Ni-silicide at metal layers/Si interface, which in combination with Ni-Ti compound formed above this interface promote the adhesion.

  20. Investigation into in vitro anti-leishmanial combinations of calcium channel blockers and current anti-leishmanial drugs

    Directory of Open Access Journals (Sweden)

    Juliana Quero Reimão

    2011-12-01

    Full Text Available The need for drug combinations to treat visceral leishmaniasis (VL arose because of resistance to antimonials, the toxicity of current treatments and the length of the course of therapy. Calcium channel blockers (CCBs have shown anti-leishmanial activity; therefore their use in combination with standard drugs could provide new alternatives for the treatment of VL. In this work, in vitro isobolograms of Leishmania (Leishmania chagasi using promastigotes or intracellular amastigotes were utilised to identify the interactions between five CCBs and the standard drugs pentamidine, amphotericin B and glucantime. The drug interactions were assessed with a fixed ratio isobologram method and the fractional inhibitory concentrations (FICs, sum of FICs (ΣFICs and the overall mean ΣFIC were calculated for each combination. Graphical isobologram analysis showed that the combination of nimodipine and glucantime was the most promising in amastigotes with an overall mean ΣFIC value of 0.79. Interactions between CCBs and the anti-leishmanial drugs were classified as indifferent according to the overall mean ΣFIC and the isobologram graphic analysis.

  1. Numerical and experimental investigation on the performance of three newly designed 100 kW-class tidal current turbines

    Directory of Open Access Journals (Sweden)

    Museok Song

    2012-09-01

    Full Text Available Three types of 100 kW-class tidal stream turbines are proposed and their performance is studied both numerically and experimentally. Following a wind turbine design procedure, a base blade is derived and two additional blades are newly designed focusing more on efficiency and cavitation. For the three designed turbines, a CFD is performed by using FLUENT. The calculations predict that the newly designed turbines perform better than the base turbine and the tip vortex can be reduced with additional efficiency increase by adopting a tip rake. The performance of the turbines is tested in a towing tank with 700 mm models. The scale problem is carefully investigated and the measurements are compared with the CFD results. All the prediction from the CFD is supported by the model experiment with some quantitative discrepancy. The maximum efficiencies are 0.49 (CFD and 0.45 (experiment at TSR 5.17 for the turbine with a tip rake.

  2. Current Understandings of the Research-Practice Gap From the Viewpoint of Complementary Medicine Academics: A Mixed-Method Investigation.

    Science.gov (United States)

    Leach, Matthew J; Tucker, Basil

    Research plays an important role in advancing health and healthcare. However, much research evidence is not reflected in contemporary complementary and alternative medicine (CAM) practice. Understanding and addressing the reasons for this research-practice gap may have positive implications for quality of care. To shed light on the gap between research and CAM practice. Descriptive cross-sectional, mixed-method study. A total of 126 senior CAM academics across Australasia, Europe, UK, and North America. Participants completed a 30-item online survey and a semi-structured interview; both of which explored the research-practice gap in CAM. A total of 43 (34%) academics completed the survey, with 29 (67%) respondents undergoing an interview. There was general agreement among respondents that CAM research should be informed by practice, and practice informed by research; however, most agreed that this did not reflect the current situation. Translational issues were perceived to be the primary reason for the research-practice gap in CAM. Suggested strategies for closing the gap focussed mostly around improving CAM student/practitioner education and training, and researcher-practitioner engagement and collaboration. Study findings point toward the presence of a research-practice gap in CAM, with several factors likely to be instrumental in sustaining this gap. Attention now needs to focus on understanding the views of CAM clinicians on this issue. Insights gained from this research will help inform the development of a multi-modal strategy that will effectively target the barriers to change in order to bring CAM research and practice closer together. Copyright © 2017 Elsevier Inc. All rights reserved.

  3. Induced pluripotent stem cells reveal functional differences between drugs currently investigated in patients with hutchinson-gilford progeria syndrome.

    Science.gov (United States)

    Blondel, Sophie; Jaskowiak, Anne-Laure; Egesipe, Anne-Laure; Le Corf, Amelie; Navarro, Claire; Cordette, Véronique; Martinat, Cécile; Laabi, Yacine; Djabali, Karima; de Sandre-Giovannoli, Annachiara; Levy, Nicolas; Peschanski, Marc; Nissan, Xavier

    2014-04-01

    Hutchinson-Gilford progeria syndrome is a rare congenital disease characterized by premature aging in children. Identification of the mutation and related molecular mechanisms has rapidly led to independent clinical trials testing different marketed drugs with a preclinically documented impact on those mechanisms. However, the extensive functional effects of those drugs remain essentially unexplored. We have undertaken a systematic comparative study of the three main treatments currently administered or proposed to progeria-affected children, namely, a farnesyltransferase inhibitor, the combination of an aminobisphosphonate and a statin (zoledronate and pravastatin), and the macrolide antibiotic rapamycin. This work was based on the assumption that mesodermal stem cells, which are derived from Hutchinson-Gilford progeria syndrome-induced pluripotent stem cells expressing major defects associated with the disease, may be instrumental to revealing such effects. Whereas all three treatments significantly improved misshapen cell nuclei typically associated with progeria, differences were observed in terms of functional improvement in prelamin A farnesylation, progerin expression, defective cell proliferation, premature osteogenic differentiation, and ATP production. Finally, we have evaluated the effect of the different drug combinations on this cellular model. This study revealed no additional benefit compared with single-drug treatments, whereas a cytostatic effect equivalent to that of a farnesyltransferase inhibitor alone was systematically observed. Altogether, these results reveal the complexity of the modes of action of different drugs, even when they have been selected on the basis of a similar mechanistic hypothesis, and underscore the use of induced pluripotent stem cell derivatives as a critical and powerful tool for standardized, comparative pharmacological studies.

  4. Comparative investigation of vibration and current monitoring for prediction of mechanical and electrical faults in induction motor based on multiclass-support vector machine algorithms

    Science.gov (United States)

    Gangsar, Purushottam; Tiwari, Rajiv

    2017-09-01

    This paper presents an investigation of vibration and current monitoring for effective fault prediction in induction motor (IM) by using multiclass support vector machine (MSVM) algorithms. Failures of IM may occur due to propagation of a mechanical or electrical fault. Hence, for timely detection of these faults, the vibration as well as current signals was acquired after multiple experiments of varying speeds and external torques from an experimental test rig. Here, total ten different fault conditions that frequently encountered in IM (four mechanical fault, five electrical fault conditions and one no defect condition) have been considered. In the case of stator winding fault, and phase unbalance and single phasing fault, different level of severity were also considered for the prediction. In this study, the identification has been performed of the mechanical and electrical faults, individually and collectively. Fault predictions have been performed using vibration signal alone, current signal alone and vibration-current signal concurrently. The one-versus-one MSVM has been trained at various operating conditions of IM using the radial basis function (RBF) kernel and tested for same conditions, which gives the result in the form of percentage fault prediction. The prediction performance is investigated for the wide range of RBF kernel parameter, i.e. gamma, and selected the best result for one optimal value of gamma for each case. Fault predictions has been performed and investigated for the wide range of operational speeds of the IM as well as external torques on the IM.

  5. An Investigation on the Current Status of the Operation Recovery Rooms in Yazd Hospitals in 2010-2011

    Directory of Open Access Journals (Sweden)

    MR Khajeh Aminian

    2012-08-01

    Full Text Available Introduction: The recovery ward is a vital unit to care patients awaking from anesthesia and is a standard requirement for the operating room. Recovery ward is located adjacent to the operation room and is easily accessible to trained and skilled individuals. The unit must have adequate equipment for surveillance and monitoring of patients and required medication should also be provided. Methods: This study is a cross-sectional conducted in one phase through referring to hospital facilities and equipment. Physical space, personnel and their skill levels and other factors that are involved in the care of patients in the recovery have been investigated. The instruments used in this study were a check list and observe sheet which were completed by the researchers. Data analysis was conducted by SPSS software. Results: The results showed that the standards of buildings and physical space in the researched areas were mostly nonstandard. Equipment standards were to some extent in line with the criteria set by American Association of Anesthesia. Besides, some equipment was blow standard levels. Personnel standards regarding the number of nurses toward the number of recovery beds did not meet the standard criteria in most of the cases. Conclusion: The research shows that building standards in most cases are not in line with mentioned references. Undertaking equipment standards in the hospital recovery wards needs reviewing and providing controlling equipment for preventing the complications of recovery phase of anesthesia in recovery wards.

  6. Investigation of tunneling current and local contact potential difference on the TiO2(110) surface by AFM/KPFM at 78 K

    Science.gov (United States)

    Wen, Huan Fei; Li, Yan Jun; Arima, Eiji; Naitoh, Yoshitaka; Sugawara, Yasuhiro; Xu, Rui; Hai Cheng, Zhi

    2017-03-01

    We propose a new multi-image method for obtaining the frequency shift, tunneling current and local contact potential difference (LCPD) on a TiO2(110) surface with atomic resolution. The tunneling current image reveals rarely observed surface oxygen atoms contrary to the conventional results. We analyze how the surface and subsurface defects affect the distribution of the LCPD. In addition, the subsurface defects are observed clearly in the tunneling current image, in contrast to a topographic image. To clarify the origin of the atomic contrast, we perform site-dependent spectroscopy as a function of the tip–sample distance. The multi-image method is expected to be widely used to investigate the charge transfer phenomena between the nanoparticles and surface sites, and it is useful for elucidating the mechanisms of catalytic reactions.

  7. Investigation of DC current models in Co2+ and Ti4+ substituted M-type BaCox Tix Fe(12-2x) O19 ferrite

    Science.gov (United States)

    Bhikhan, Vikas; Singh, Charanjeet; Kaur, Rajneesh; Jaroszewski, Maciej; Bindra Narang, S.

    2015-12-01

    The static current density ( J)-electric field ( E) characteristics of BaCo x Ti x Fe(12-2 x)O19 ferrite compositions ( x = 0.1, 0.3, 0.5, 0.7, 0.9) have been investigated at an applied field from 0.003 kV/m to 4.98 kV/m at room temperature. Compositions x = 0.3, 0.5 and 0.7 exhibit ohmic behavior at low applied field and non-linear conduction is observed in compositions x = 0.1, 0.3, 0.7 and 0.9 at higher applied field. The various non-linear conduction models, associated with Schottky, Poole-Frenkel, Ionic Hopping and Space Charge Limited Current mechanisms, have been discussed. The large current density has been found at higher substitution.

  8. Trauma symptoms, internalized stigma, social support, and sexual risk behavior among HIV-positive gay and bisexual MSM who have sought sex partners online.

    Science.gov (United States)

    Burnham, Kaylee E; Cruess, Dean G; Kalichman, Moira O; Grebler, Tamar; Cherry, Chauncey; Kalichman, Seth C

    2016-01-01

    Gay, bisexual, and other men who have sex with men (MSM) remain the highest risk group for HIV infection. One reason is the increased use of the Internet to meet potential sex partners, which is associated with greater sexual risk behavior. To date, few studies have investigated psychosocial predictors of sexual risk behavior among gay and bisexual men seeking sex partners online. The purpose of the current study was to test a conceptual model of the relationships between trauma symptoms indexed on the event of HIV diagnosis, internalized HIV stigma, and social support on sexual risk behavior among gay and bisexual MSM who seek sex partners online. A sample of 142 gay and bisexual MSM recruited on- and offline completed a comprehensive online assessment battery assessing the factors noted above. A number of associations emerged; most notably internalized HIV stigma mediated the relationship between trauma-related symptoms indexed on the event of HIV diagnosis and sexual risk behavior with HIV-negative and unknown serostatus sex partners. This suggests that gay and bisexual MSM who are in greater distress over their HIV diagnosis and who are more sensitive to HIV stigma engage in more HIV transmission risk behavior. As sexual risk environments expand with the increasing use of the Internet to connect with others for sex, it is important to understand the predictors of sexual risk behavior so that tailored interventions can promote sexual health for gay and bisexual MSM seeking sex online.

  9. Investigation of the influence of image reconstruction filter and scan parameters on operation of automatic tube current modulation systems for different CT scanners.

    Science.gov (United States)

    Sookpeng, Supawitoo; Martin, Colin J; Gentle, David J

    2015-03-01

    Variation in the user selected CT scanning parameters under automatic tube current modulation (ATCM) between hospitals has a substantial influence on the radiation doses and image quality for patients. The aim of this study was to investigate the effect of changing image reconstruction filter and scan parameter settings on tube current, dose and image quality for various CT scanners operating under ATCM. The scan parameters varied were pitch factor, rotation time, collimator configuration, kVp, image thickness and image filter convolution (FC) used for reconstruction. The Toshiba scanner varies the tube current to achieve a set target noise. Changes in the FC setting and image thickness for the first reconstruction were the major factors affecting patient dose. A two-step change in FC from smoother to sharper filters doubles the dose, but is counterbalanced by an improvement in spatial resolution. In contrast, Philips and Siemens scanners maintained tube current values similar to those for a reference image and patient, and the tube current only varied slightly for changes in individual CT scan parameters. The selection of a sharp filter increased the image noise, while use of iDose iterative reconstruction reduced the noise. Since the principles used by CT manufacturers for ATCM vary, it is important that parameters which affect patient dose and image quality for each scanner are made clear to operator to aid in optimisation.

  10. Less Than One-Third of Caretakers Sought Formal Health Care Facilities for Common Childhood Illnesses in Ethiopia: Evidence from the 2011 Ethiopian Demographic Health Survey

    Directory of Open Access Journals (Sweden)

    Achamyelesh Gebretsadik

    2015-01-01

    Full Text Available Background. Most of the childhood illnesses can be proven with effective interventions. However, countless children die needlessly in developing countries due to the failure of their guardians to seek care timely. The aim of this study was to assess health care seeking behavior of caretakers of children under the age of five years for treatment of common childhood illnesses. Methods. Further analysis of the Ethiopian 2011 demographic and health survey was done. All children under the age of five reported to have been ill from the three common childhood illnesses and their caretakers were included in the analysis. A complex sample logistic regression model was employed to determine factors associated with the health care seeking behavior of caretakers. Result. A total of 2,842 caregivers who reported that their index child had at least one of the three common childhood illnesses in the two weeks preceding the survey were captured, of which 849 (29.87%; 95% CI: 28, 32% sought formal health care facilities. Conclusion and Recommendation. In Ethiopia health care seeking behavior of caretakers for common childhood illnesses is low. Increasing mass media exposure can possibly improve the health seeking behavior of caretakers.

  11. 埋地管道交流腐蚀的研究进展%INVESTIGATION PROGRESS OF ALTERNATING CURRENT CORROSION ON BURIED PIPELINES

    Institute of Scientific and Technical Information of China (English)

    董亮; 路民旭; 杜艳霞; 姜子涛

    2011-01-01

    Alternating current (AC) corrosion on buried pipelines has drawn much attention. Current status of the researches is reviewed in this article. The understanding of AC corrosion is mentioned. Characteristics, mechanisms, and mitigations of AC corrosion and the evaluation methods for AC corrosion risk are concluded. Finally, the issues for further investigations are proposed.%综述了埋地管道交流腐蚀的研究现状,包括人们对交流腐蚀的认识过程,交流腐蚀的特征和机理,交流腐蚀风险的评价方法以及交流腐蚀的缓解措施.最后提出了埋地管道交流腐蚀有待解决的问题.

  12. A Power Interruption Technique for Investigation of Temperature Difference in Stabilized Low Direct-Current Arc Burning in Pure Argon on Atmospheric Pressure

    Institute of Scientific and Technical Information of China (English)

    M. M. Kuzmanovi(c); J. J. Savovi(c); D. P. Rankovi(c); M. Stoiljkovi(c); A. Anti(c)-Jovanovi(c); M.S. Pavlovi(c); M. Marinkovi(c)

    2008-01-01

    @@ Plasma of argon stabilized arc column, in a current range 3-11 A, is investigated using emission spectrometric diagnostic techniques. Temperatures are evaluated using several methods: argon line to adjacent recombinational continuum intensity ratio, absolute emissivity of argon fine, measurement of electron number density, and power interruption. Electron number density is evaluated from absolute emissivity of recombinational continuum. The difference between electron Te and heavy particle Th temperature ranged from 4500 K for 3 A to 2300 K for 11 A arc current. By comparing the present with the previously obtained results, using the same arc device but with the introduction of water aerosol, it is concluded that water aerosol reduces the difference Te - Th and brings plasma closer to the partial thermodynamic equilibrium state.

  13. Investigation of electric charge transport in conjugated polymer P3HT: PCBM solar cell with temperature dependent current and capacitance measurements

    Energy Technology Data Exchange (ETDEWEB)

    Yu, Peiqing; Mencaraglia, Denis; Darga, Arouna; Migan, Anne [Laboratoire de Genie Electrique de Paris, CNRS UMR 8507, SUPELEC, UPMC, Universite Paris VI, Universite Paris-Sud, 11 Rue Joliot Curie, Plateau de Moulon, 91192 Gif-Sur-Yvette Cedex (France); Rabdbeh, Roshanak; Ratier, Bernard; Moliton, Andre [Institut Carnot XLim, UMR 6172, CNRS, Universite de Limoges, 123 Avenue Albert Thomas, 87060 Limoges Cedex (France)

    2010-04-15

    We investigated quantitatively the electronic transport properties of a bulk heterojunction polymer/fullerene solar cell, based on structure Glass/ITO/P3HT:PCBM/Al. The current-voltage I-V characteristics in the intermediate positive bias and temperature regime (0.2 V {<=} V {<=} 1.5 V, 180 K {<=} T {<=} 250 K) can be well fitted by a modified Poole-Frenkel PF detrapping model. Combining these results with the high frequency capacitance measurements, we could then derive independently the absorber thickness and its dielectric constant. At low temperature (80 K {<=} T {<=} 170 K), the I-V data can be well accounted for with Space Charge Limited Current (SCLC) regimes. At intermediate positive bias (1 V {<=} V {<=} 2.3 V), the current is dominated by the trapped space charges with an exponential traps distribution, while at high positive bias (2.5 V {<=} V {<=} 4 V), the space charges due to injected free carrier play an important role for the conduction. From the fits to the two different SCLC models, we could then extract the electrically active defects parameters controlling the transport. These parameters were confirmed by space charge capacitance spectroscopy (copyright 2010 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim) (orig.)

  14. Study of thermal-field emission properties and investigation of temperature dependent noise in the field emission current from vertical carbon nanotube emitters

    Science.gov (United States)

    Kolekar, Sadhu; Patole, S. P.; Patil, Sumati; Yoo, J. B.; Dharmadhikari, C. V.

    2017-10-01

    We have investigated temperature dependent field electron emission characteristics of vertical carbon nanotubes (CNTs). The generalized expression for electron emission from well-defined cathode surface is given by Millikan and Lauritsen [1] for the combination of temperature and electric field effect. The same expression has been used to explain the electron emission characteristics from vertical CNT emitters. Furthermore, this has been applied to explain the electron emission for different temperatures ranging from room temperature to 1500 K. The real-time field electron emission images at room temperature and 1500 K are recorded by using Charge Coupled Device (CCD) in order to understand the effect of temperature on distribution of electron emission spots and ring like structures in Field Emission Microscope (FEM) image. The FEM images could be used to calculate the total number of emitters per cm2 for electron emission. The calculated number of emitters per cm2 from FEM image is typically, 4.5 × 107 and the actual number emitters per cm2 present as per Atomic Force Microscopy (AFM) data is 1.2 × 1012. The measured Current-Voltage (I-V) characteristics exhibit non linear Folwer-Nordheim (F-N) type behavior. The fluctuations in the emission current were recorded at different temperatures and Fast Fourier transformed into temperature dependent power spectral density. The latter was found to obey power law relation S(f) = A(Iδ/fξ), where δ and ξ are temperature dependent current and frequency exponents respectively.

  15. Study of Thermal-Field Emission Properties and Investigation of Temperature dependent Noise in the Emission Current form vertical Carbon nanotube emitters

    KAUST Repository

    Kolekar, Sadhu

    2017-05-05

    We have investigated temperature dependent field electron emission characteristics of vertical carbon nanotubes (CNTs). The generalized expression for electron emission from well defined cathode surface is given by Millikan and Lauritsen [1] for the combination of temperature and electric field effect. The same expression has been used to explain the electron emission characteristics from vertical CNT emitters. Furthermore, this has been applied to explain the electron emission for different temperatures ranging from room temperature to 1500 K. The real-time field electron emission images at room temperature and 1500 K are recorded by using Charge Coupled Device (CCD), in order to understand the effect of temperature on electron emission spots in image morphology (as indicated by ring like structures) and electron emission spot intensity of the emitters. Moreover, the field electron emission images can be used to calculate the total number of emitters per cm2 for electron emission. The calculated number of emitters per cm2 is 4.5x107 and, the actual number emitters per cm2 present for electron emission calculated from Atomic Force Microscopy (AFM) data is 1.2x1012. The measured Current-Voltage (I-V) characteristics obey the Folwer-Nordheim (F-N) type behavior. The fluctuations in the emission current are recorded at different temperatures and, temperature dependence of power spectral density obeys power law relation s(f)=I2/f2 with that of emission current and frequency.

  16. A methodology to investigate the intrinsic effect of the pulsed electric current during the spark plasma sintering of electrically conductive powders.

    Science.gov (United States)

    Locci, Antonio Mario; Cincotti, Alberto; Todde, Sara; Orrù, Roberto; Cao, Giacomo

    2010-08-01

    A novel methodology is proposed for investigating the effect of the pulsed electric current during the spark plasma sintering (SPS) of electrically conductive powders without potential misinterpretation of experimental results. First, ensemble configurations (geometry, size and material of the powder sample, die, plunger and spacers) are identified where the electric current is forced to flow only through either the sample or the die, so that the sample is heated either through the Joule effect or by thermal conduction, respectively. These ensemble configurations are selected using a recently proposed mathematical model of an SPS apparatus, which, once suitably modified, makes it possible to carry out detailed electrical and thermal analysis. Next, SPS experiments are conducted using the ensemble configurations theoretically identified. Using aluminum powders as a case study, we find that the temporal profiles of sample shrinkage, which indicate densification behavior, as well as the final density of the sample are clearly different when the electric current flows only through the sample or through the die containing it, whereas the temperature cycle and mechanical load are the same in both cases.

  17. A methodology to investigate the intrinsic effect of the pulsed electric current during the spark plasma sintering of electrically conductive powders

    Directory of Open Access Journals (Sweden)

    Antonio Mario Locci, Alberto Cincotti, Sara Todde, Roberto Orrù and Giacomo Cao

    2010-01-01

    Full Text Available A novel methodology is proposed for investigating the effect of the pulsed electric current during the spark plasma sintering (SPS of electrically conductive powders without potential misinterpretation of experimental results. First, ensemble configurations (geometry, size and material of the powder sample, die, plunger and spacers are identified where the electric current is forced to flow only through either the sample or the die, so that the sample is heated either through the Joule effect or by thermal conduction, respectively. These ensemble configurations are selected using a recently proposed mathematical model of an SPS apparatus, which, once suitably modified, makes it possible to carry out detailed electrical and thermal analysis. Next, SPS experiments are conducted using the ensemble configurations theoretically identified. Using aluminum powders as a case study, we find that the temporal profiles of sample shrinkage, which indicate densification behavior, as well as the final density of the sample are clearly different when the electric current flows only through the sample or through the die containing it, whereas the temperature cycle and mechanical load are the same in both cases.

  18. Studies on the direct methanol fuel cell: Characterization of proton conducting polymer membranes and investigations of current distribution at the cathode

    Energy Technology Data Exchange (ETDEWEB)

    Saarinen, V.

    2007-07-01

    ), as over 2 000 h DMFC testing was carried out without any loss of performance. The methanol crossover and other mass transfer phenomena have been investigated in a free-breathing DMFC both experimentally and computationally. The information on local concentrations of the reacting species is obtained by measuring the current distribution profile using a resistor network approach and a segmented cathode. The developed numerical 3D model describes the behaviour of the free-breathing DMFC and gives spatial information on mass transfer phenomena, e.g. predicts the existence of the observed electrolytic domains, i.e. regions of negative current densities. (orig.)

  19. Surface Morphology Study of Nanostructured Lead-Free Solder Alloy Sn-Ag-Cu Developed by Electrodeposition: Effect of Current Density Investigation

    Directory of Open Access Journals (Sweden)

    Sakinah Mohd Yusof

    2013-10-01

    Full Text Available Normal 0 false false false IN X-NONE X-NONE MicrosoftInternetExplorer4 Nanostructured lead-free solder Sn-Ag-Cu (SAC was developed by electrodeposition method at room temperature. Electrolite bath which comprised of the predetermined quantity of tin methane sulfonate, copper sulfate and silver sulfate were added sequentially to MSA solution. The methane sulphonic acid (MSA based ternary Sn-Ag-Cu bath was developed by using tin methane sulfonate as a source of Sn ions while the Cu+ and Ag+ ions were obtained from their respective sulfate salts. The rate of the electrodeposition was controlled by variation of current density. The addition of the buffer, comprising of sodium and ammonium acetate helped in raising the pH solution. During the experimental procedure, the pH of solution, composition of the electrolite bath, and the electrodeposition time were kept constant. The electrodeposited rate, deposit composition and microstructure were investigated as the effect of current density. The electrodeposited solder alloy was characterized for their morphology using Field Emission Scanning Electron Microscope (FESEM. In conclusion, vary of current density will play significant role in the surface morphology of nanostructured lead-free solder SAC developed. Normal 0 false false false IN X-NONE X-NONE MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New

  20. Geohydrologic Investigations and Landscape Characteristics of Areas Contributing Water to Springs, the Current River, and Jacks Fork, Ozark National Scenic Riverways, Missouri

    Science.gov (United States)

    Mugel, Douglas N.; Richards, Joseph M.; Schumacher, John G.

    2009-01-01

    The Ozark National Scenic Riverways (ONSR) is a narrow corridor that stretches for approximately 134 miles along the Current River and Jacks Fork in southern Missouri. Most of the water flowing in the Current River and Jacks Fork is discharged to the rivers from springs within the ONSR, and most of the recharge area of these springs is outside the ONSR. This report describes geohydrologic investigations and landscape characteristics of areas contributing water to springs and the Current River and Jacks Fork in the ONSR. The potentiometric-surface map of the study area for 2000-07 shows that the groundwater divide extends beyond the surface-water divide in some places, notably along Logan Creek and the northeastern part of the study area, indicating interbasin transfer of groundwater between surface-water basins. A low hydraulic gradient occurs in much of the upland area west of the Current River associated with areas of high sinkhole density, which indicates the presence of a network of subsurface karst conduits. The results of a low base-flow seepage run indicate that most of the discharge in the Current River and Jacks Fork was from identified springs, and a smaller amount was from tributaries whose discharge probably originated as spring discharge, or from springs or diffuse groundwater discharge in the streambed. Results of a temperature profile conducted on an 85-mile reach of the Current River indicate that the lowest average temperatures were within or downstream from inflows of springs. A mass-balance on heat calculation of the discharge of Bass Rock Spring, a previously undescribed spring, resulted in an estimated discharge of 34.1 cubic feet per second (ft3/s), making it the sixth largest spring in the Current River Basin. The 13 springs in the study area for which recharge areas have been estimated accounted for 82 percent (867 ft3/s of 1,060 ft3/s) of the discharge of the Current River at Big Spring during the 2006 seepage run. Including discharge from

  1. Large A.C. machines theory and investigation methods of currents and losses in stator and rotor meshes including operation with nonlinear loads

    CERN Document Server

    Boguslawsky, Iliya; Hayakawa, Masashi

    2017-01-01

    In this monograph the authors solve the modern scientific problems connected with A.C. motors and generators, based first on the detailed consideration of their physical phenomena. The authors describe the theory and investigative methods they developed and applied in practice, which are considered to be of essential interest for specialists in the field of the electrical engineering industry in European countries, the USA, Argentina, and Brazil, as well as in such countries as India, China, and Iran. This book will be of interest to engineers specialized in the field of the manufacture, operation, and repair of A.C. machines (motors and generators) as well as electric drives; to professors, lecturers, and post-graduate students of technical universities, who are specializing in the field of electric machine engineering and electric drives; and to students who are engaged in the field of high current techniques, electric drives, and electric machine engineering.

  2. Investigation of chemical vapour deposition diamond detectors by X- ray micro-beam induced current and X-ray micro-beam induced luminescence techniques

    CERN Document Server

    Olivero, P; Vittone, E; Fizzotti, F; Paolini, C; Lo Giudice, A; Barrett, R; Tucoulou, R

    2004-01-01

    Tracking detectors have become an important ingredient in high-energy physics experiments. In order to survive the harsh detection environment of the Large Hadron Collider (LHC), trackers need to have special properties. They must be radiation hard, provide fast collection of charge, be as thin as possible and remove heat from readout electronics. The unique properties of diamond allow it to fulfill these requirements. In this work we present an investigation of the charge transport and luminescence properties of "detector grade" artificial chemical vapour deposition (CVD) diamond devices developed within the CERN RD42 collaboration, performed by means of X-ray micro-beam induced current collection (XBICC) and X-ray micro- beam induced luminescence (XBIL) techniques. XBICC technique allows quantitative estimates of the transport parameters of the material to be evaluated and mapped with micrometric spatial resolution. In particular, the high resolution and sensitivity of the technique has allowed a quantitati...

  3. An investigation of the role of the time averaged ion beam current density upon the defect densities in thin film SIMOX

    Science.gov (United States)

    Nejim, A.; Marsh, C. D.; Giles, L. F.; Hemment, P. L. F.; Li, Y.; Chater, RJ.; Kilner, J. A.; Booker, G. R.

    1994-02-01

    The effect of the time averaged ion beam current density on the material quality of thin film SIMOX has been investigated. Thin film SOI/SIMOX material has been produced by 200 keV oxygen implantation into 3 in. Fz wafers with a background temperature of 680°C. The dose range of 5 × 10 17-7 × 10 17O+/ cm2 was selected to be near the dose threshold for the formation of a continuous buried oxide after implantation and annealing which is thought to be between 5 × 10 17 and 6 × 10 17 O +/cm 2 for 200 keV [A.E. White et al., Appl. Phys. Lett. 50 (1987) 19; P.L.F. Hemment et al., Vacuum 36 (1986) 877; Y. Li et al., in: Proc. V Int. Symp. on SOI Technology and Devices (The Electrochemical Society, 1992) p. 368 [1-3

  4. Investigation of the current population of Dendroctonus micans (Kugelann (Coleoptera: Curculionidae and colonization rate of Rhizophagus grandis Gyllenhal (Coleoptera: Monotomidae in spruce forests of Artvin

    Directory of Open Access Journals (Sweden)

    Hazan Alkan Akıncı

    2017-04-01

    Full Text Available In this study, current population of Dendroctonus micans (Kugelann (Coleoptera: Curculionidae, and colonization status of its specific predator Rhizophagus grandis Gyllenhal (Coleoptera: Monotomidae in spruce forests of Artvin were investigated. Field works were conducted in a total of 30 sampling plots and along 20 transects. Sampling plots were 30 × 10 m in size and transects 50 m long. Presently, D. micans has a “very low infestation” rate in Artvin spruce forests and D. micans infestation rate is 4.1 times lower than the early 2000s. The trees at the stands edges were attacked more than trees in stand closure. All the larval galleries of D. micans were colonized by R. grandis. R. grandis could colonize larval galleries of its prey even in endemic conditions.

  5. Investigation of the Effects of Facility Background Pressure on the Performance and Voltage-Current Characteristics of the High Voltage Hall Accelerator

    Science.gov (United States)

    Kamhawi, Hani; Huang, Wensheng; Haag, Thomas; Spektor, Rostislav

    2014-01-01

    The National Aeronautics and Space Administration (NASA) Science Mission Directorate In-Space Propulsion Technology office is sponsoring NASA Glenn Research Center to develop a 4 kW-class Hall thruster propulsion system for implementation in NASA science missions. A study was conducted to assess the impact of varying the facility background pressure on the High Voltage Hall Accelerator (HiVHAc) thruster performance and voltage-current characteristics. This present study evaluated the HiVHAc thruster performance in the lowest attainable background pressure condition at NASA GRC Vacuum Facility 5 to best simulate space-like conditions. Additional tests were performed at selected thruster operating conditions to investigate and elucidate the underlying physics that change during thruster operation at elevated facility background pressure. Tests were performed at background pressure conditions that are three and ten times higher than the lowest realized background pressure. Results indicated that the thruster discharge specific impulse and efficiency increased with elevated facility background pressure. The voltage-current profiles indicated a narrower stable operating region with increased background pressure. Experimental observations of the thruster operation indicated that increasing the facility background pressure shifted the ionization and acceleration zones upstream towards the thruster's anode. Future tests of the HiVHAc thruster are planned at background pressure conditions that are expected to be two to three times lower than what was achieved during this test campaign. These tests will not only assess the impact of reduced facility background pressure on thruster performance, voltage-current characteristics, and plume properties; but will also attempt to quantify the magnitude of the ionization and acceleration zones upstream shifting as a function of increased background pressure.

  6. The Investigation of Sudden Arrhythmic Death Syndrome (SADS – the current approach to family screening and the future role of genomics & stem cell technology

    Directory of Open Access Journals (Sweden)

    Vishal eVyas

    2013-09-01

    Full Text Available SADS is defined as sudden death under the age of 40 years old in the absence of structural heart disease. Family screening studies are able to identify a cause in up to 50% of cases-most commonly long QT syndrome, Brugada and early repolarisation syndrome, and catecholaminergic polymorphic ventricular tachycardia using standard clinical screening investigations including pharmacological challenge testing. These diagnoses may be supported by genetic testing which can aid cascade screening and may help guide management. In the current era it is possible to undertake molecular autopsy provided suitable samples of DNA can be obtained from the proband. With the evolution of rapid sequencing techniques it is possible to sequence the whole exome for candidate genes. This major advance offers the opportunity to identify novel causes of lethal arrhythmia but also poses the challenge of managing the volume of data generated and evaluating variants of unknown significance. The emergence of induced pluripotent stem cell technology could enable evaluation of the electrophysiological relevance of specific ion channel mutations in the proband or their relatives and will potentially enable screening of idiopathic ventricular fibrillation survivors combining genetic and electrophysiological studies in derived myocytes. This also could facilitate the assessment of personalised preventative pharmacological therapies. This review will evaluate the current screening strategies in SADS families, the role of molecular autopsy and genetic testing and the potential applications of molecular and cellular diagnostic strategies on the horizon.

  7. Experimental Investigation on the Influence of Axial Magnetic Field Distribution on Resisting the Constriction of a High-Current Vacuum Arc

    Institute of Scientific and Technical Information of China (English)

    SHI Zongqian; LIU Zhigang; JIA Shenli; SONG Xiaochuan; WANG Lijun

    2009-01-01

    Effect of the axial magnetic field (AMF) on resisting the constriction of a high-current vacuum arc is studied in this paper. Two typical AMF distributions were investigated, i.e., the traditional bell-shaped AMF, and the saddle-shaped AMF. Experiments were conducted in a detachable vacuum chamber with a rms arc current in the range of 10 kA to 25 kA. The arc column was photographed by a high-speed digital camera with an exposure time of 2 microseconds. The constriction of the vacuum arc was compared by processing the images of the arc column under the two different field configurations and numerically determining the dimensions of the arc column near the electrodes. It was also confirmed that the AMF distribution had a signifcant influence on its effectiveness in resisting arc constriction, Furthermore, the AMF strength near the periphery of the arc is more influential than that at the centre of the electrodes in resisting arc constriction.

  8. Investigation of band offsets and direct current leakage properties of nitrogen doped epitaxial Gd{sub 2}O{sub 3} thin films on Si

    Energy Technology Data Exchange (ETDEWEB)

    Roy Chaudhuri, Ayan; Osten, H. J. [Institute of Electronic Materials and Devices, Leibniz University of Hannover, Schneiderberg 32, D-30167 Hannover (Germany); Fissel, A. [Information Technology Laboratory, Leibniz University of Hannover, Schneiderberg 32, D-30167 Hannover (Germany)

    2013-05-14

    Dielectric properties of epitaxial Gd{sub 2}O{sub 3} thin films grown on Si have been found to improve significantly by incorporation of suitable dopants. However, in order to achieve optimum electrical properties from such doped oxides, it is important to understand the correlation between doping and the electronic structure of the material. In the present article, we report about the effect of nitrogen doping on the electronic structure and room temperature dc leakage properties of epitaxial Gd{sub 2}O{sub 3} thin films. Epitaxial Gd{sub 2}O{sub 3}:N thin films were grown on p-type Si (111) substrates by solid source molecular beam epitaxy technique using molecular N{sub 2}O as the nitridation agent. First investigations confirmed the presence of substitutional N in the Gd{sub 2}O{sub 3}:N layers. Incorporation of nitrogen did not affect the structural quality of the oxide layers. X ray photoelectron spectroscopy investigations revealed band gap narrowing in epitaxial Gd{sub 2}O{sub 3} due to nitrogen doping, which leads to reduction in the valence band offset of the Gd{sub 2}O{sub 3}:N layers with Si. DC leakage current measured at room temperature revealed that despite reduction in the band gap and valence band offsets due to N doping, the Gd{sub 2}O{sub 3}:N layers remain sufficiently insulating. A significant reduction of the leakage current densities in the Gd{sub 2}O{sub 3}:N layers with increasing nitrogen content suggests that doping of epitaxial Gd{sub 2}O{sub 3} thin films with nitrogen can be an effective route to eliminate the adverse effects of the oxygen vacancy induced defects in the oxide layers.

  9. Current meter data from moored current meter casts in the Coastal Waters of S. Alaska as part of the Fisheries-Oceanography Cooperative Investigations (FOCI) project from 21 August 1984 - 01 July 1985 (NCEI Accession 8700053)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Current meter data were collected using moored current meter casts in the Coastal Waters of S. Alaska from August 21, 1984 to July 1, 1985. Data were submitted by...

  10. Physical, current, and other data from CTD and current meters from FIXED PLATFORMS in the Bering Sea in support of the Fisheries-Oceanography Coordinated Investigations (FOCI) project from 25 February 1998 to 10 October 2001 (NODC Accession 0000665)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Physical, current, and other data from CTD and current meters from FIXED PLATFORMS in the Bering Sea from 25 February 1998 to 10 October 2001. Data were collected by...

  11. Current meter and pressure gauge data from moored current meter casts and other instruments in the Gulf of Alaska as part of the Fisheries-Oceanography Cooperative Investigations (FOCI) project, 26 April 1989 - 26 September 1989 (NODC Accession 9100068)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Current meter and pressure gauge data were collected using moored current meter casts and other instruments in the Gulf of Alaska from April 22, 1989 to September...

  12. The investigation of the effectiveness of the criteria for the construction of a physics text for students with dyslexia: The case of the electric current

    Directory of Open Access Journals (Sweden)

    Panagiotis Papalexopoulos

    2008-01-01

    Full Text Available In this paper we studied the effectiveness of the writing criteria that are proposed to be applied during the construction of physics texts so that students with dyslexia do not confront reading difficulties with them. The effectiveness of the criteria has been assessed by the accomplishment of an investigation among students with and without dyslexia. A physics text that was constructed according to the writing criteria and referred to the concept of the electric current was given to read by all students. Twenty two (22 questions were used in order to assign the recognition of the physical phenomena, the physical quantities, the relations between the physical quantities and the units of measurement by all the students. The results of the investigation showed that the writing criteria helped the students with dyslexia not to have difficulties with the physics text about the “electric current”. The only area that students with dyslexia had some difficulties compared to the students without dyslexia was the recognition of the units of measurement.

  13. Switching performance and efficiency investigation of GaN based DC-DC Buck converter for low voltage and high current applications

    Science.gov (United States)

    Alatawi, Khaled; Almasoudi, Fahad; Matin, Mohammad

    2016-09-01

    The Wide band-gap (WBG) materials "such as Silicon Carbide (SiC) and Gallium nitride (GaN)" based power switching devices provide higher performance capabilities compared to Si-based power switching devices. The wide band-gap materials based power switching devices outperform Si-based devices in many performance characteristics such as: low witching loss, low conduction loss, high switching frequencies, and high operation temperature. GaN based switching devices benefit a lot of applications such as: future electric vehicles and solar power inverters. In this paper, a DC-DC Buck converter based on GaN FET for low voltage and high current applications is designed and investigated. The converter is designed for stepping down a voltage of 48V to 12V with high switching frequency. The capability of the GaN FET based buck converter is studied and compared to equivalent SiC MOSFET and Si-based MOSFET buck converters. The analysis of switching losses and efficiency was performed to compare the performance capabilities of GaN FET, SiC MOSFET and Si-based MOSFET. The results showed that the overall switching losses of GaN FET are lower than that of SiC and Si-based power switching devices. Also, the performance capability of GaN devices with higher frequencies is studied. GaN devices with high frequencies will reduce the total size and the cost of the power converter. In Addition, the overall efficiency of the DC-DC Buck converter is higher with the GaN FET switching devices, which make it more suitable for low voltage and high current applications.

  14. Looking for neuronal currents using MRI: an EEG-fMRI investigation of fast MR signal changes time-locked to frequent focal epileptic discharges.

    Science.gov (United States)

    Rodionov, Roman; Siniatchkin, Michael; Michel, Christoph M; Liston, Adam D; Thornton, Rachel; Guye, Maxime; Carmichael, David W; Lemieux, Louis

    2010-04-15

    Reproducible direct measurement of neuronal electrical activity using MRI signal changes due to local magnetic field perturbations would represent a step change in neuroimaging methods. While some previous studies using experiments based on evoked and spontaneous activity provided encouraging results no clear demonstration of neuronal current-related MR changes in the human brain has emerged to date. The availability of simultaneously acquired EEG-fMRI in patients with frequent interictal epileptic discharges (IED), which have significantly greater amplitude than evoked potentials, offers the opportunity to further investigate the phenomenon. We re-analysed simultaneously acquired EEG-fMRI data in 6 epilepsy patients with very frequent focal IED and a well-localised generator. A model of MRI signal changes due to fast activity and BOLD signal changes was used to identify fast MR signal changes, potentially directly reflecting neuronal activity. Simultaneously-acquired EEG allowed the comparison of electrical source localisation (ESI), clinical epilepsy localisation and BOLD signal changes with the fast MR signal changes. Clusters of IED-related fast MR signal change were observed in all cases. Spatial correspondence between the IED-related fast MR, BOLD, ESI clusters and irritative zone (IZ) was observed in one slice of a single dataset. The other IED-related fast MR clusters were remote from electro-clinically determined generators of interictal activity. The sign and magnitude of the fast MR signal changes varied across regions and subjects. The observed fast MR changes cannot be confidently attributed to the direct effect of neuronal currents due to lack of spatial concordance with generators of interictal activity, IED-related BOLD clusters and ESI estimates. Copyright 2009 Elsevier Inc. All rights reserved.

  15. Experimental investigation of droplet separation in a horizontal counter-current air/water stratified flow; Experimentelle Untersuchung der Tropfenabscheidung einer horizontalen, entgegengerichteten Wasser/Luft-Schichtenstroemung

    Energy Technology Data Exchange (ETDEWEB)

    Gabriel, Stephan Gerhard

    2015-07-01

    A stratified counter-current two-phase gas/liquid flow can occur in various technical systems. In the past investigations have mainly been motivated by the possible occurrence of these flows in accident scenarios of nuclear light water-reactors and in numerous applications in process engineering. However, the precise forecast of flow parameters, is still challenging, for instance due to their strong dependency on the geometric boundary conditions. A new approach which uses CFD methods (Computational Fluid Dynamics) promises a better understanding of the flow phenomena and simultaneously a higher scalability of the findings. RANS methods (Reynolds Averaged Navier Stokes) are preferred in order to compute industrial processes and geometries. A very deep understanding of the flow behavior and equation systems based on real physics are necessary preconditions to develop the equation system for a reliable RANS approach with predictive power. Therefore, local highly resolved, experimental data is needed in order to provide and validate the required turbulence and phase interaction models. The central objective of this work is to provide the data needed for the code development for these unsteady, turbulent and three-dimensional flows. Experiments were carried out at the WENKA facility (Water Entrainment Channel Karlsruhe) at the Karlsruhe Institute of Technology (KIT). The work consists of a detailed description of the test-facility including a new bended channel, the measurement techniques and the experimental results. The characterization of the new channel was done by flow maps. A high-speed imaging study gives an impression of the occurring flow regimes, and different flow phenomena like droplet separation. The velocity distributions as well as various turbulence values were investigated by particle image velocimetry (PIV). In the liquid phase fluorescent tracer-particles were used to suppress optical reflections from the phase surface (fluorescent PIV, FPIV

  16. Investigation on current situation of advanced schistosomiasis in Tongcheng City, Anhui Province%2010年桐城市晚期血吸虫病现状调查

    Institute of Scientific and Technical Information of China (English)

    江龙志; 徐辉; 魏强

    2012-01-01

    2010年对桐城市晚期血吸虫病(晚血)分布现状进行调查,共确诊205例晚血,全市推算患病率为0.027%.病例主要分布在传播阻断村(67.32%),50~岁年龄组患者占97.07%,文盲和小学文化程度者占95.61%,92.20%的患者接受过病原学治疗.%This paper describes the investigation on the current situation and characteristics of advanced schistosomiasis in Tongcheng City,Anhui Province. There were 205 cases of advanced schislosomiasis with the estimated prevalence of 0.027% in the city. Most of advance schistosomiasis patients (67.32%) distributed in schistosomiasis transmission interrupted areas,97.07% of them were over 50 years old,95.61% of them were illiteracy and persons with low education level (primary school education),and 92.20% of them received anti-schistosomiasis treatment.

  17. Investigation on Current Situation of Middle School Students’ Morning Exercise in Shantou City%汕头市中学生晨练现状调查研究

    Institute of Scientific and Technical Information of China (English)

    王腊姣; 卢刚

    2014-01-01

    This paper made an investigation and study of the current situation about students ’ morning exercise in 11 middle schools in Shantou city by means of questionnaire survey , comparative analysis and mathematical statis-tics, analyzed the secondary students ’ perspective, preference, ways, motivation, place and content, restrictive factors and common misconceptions of morning exercises , discussed the positive and negative factors for the devel-opment of students ’ morning exercises in secondary schools in Shantou , and finally proposed the corresponding countermeasure and suggestion .%本文通过问卷调查法、比较分析法及数理统计法等对汕头市11所学校的中学生晨练现状进行了调查研究,分析了中学生晨练的认知态度、情绪体验、组织形式、动机类型、晨练地点与内容、晨练的制约因素以及晨练中的常见误区,探讨了汕头市中学生晨练活动发展的积极因素和不利因素,并提出相应的有益于中学生晨练活动开展的对策和建议。

  18. Dynamic investigation of the transport current in YBa{sub 2}Cu{sub 3}O{sub 7-{delta}} thin films

    Energy Technology Data Exchange (ETDEWEB)

    Lucarelli, A; Frey, A; Yang, R; Luepke, G [Department of Applied Science, The College of William and Mary, Williamsburg, VA 23187-8795 (United States); Haugan, T J; Levin, G A; Barnes, P N [Air Force Research Laboratory, Wright-Patterson AFB, OH 45433-7919 (United States)

    2008-11-01

    The current density evolution in YBa{sub 2}Cu{sub 3}O{sub 7-{delta}} thin films is studied by time-resolved magneto-optical imaging as a function of the phase of an ac current applied simultaneously with a perpendicular dc magnetic field. We present a new empirical method to separate the total current distribution into a circulating current, which screens the applied field, and the applied transport current. The latter shows an asymmetric profile with pronounced peaks at the edges of the sample and its phase-dependent self-field is contained in the flux region bound by the circulating current. Threading dislocations provide the necessary pinning sites for the observed high local values of the transport current.

  19. Investigation on current situation of Toxoplasma infection in reproductive population%育龄人群弓形虫感染现状调查分析

    Institute of Scientific and Technical Information of China (English)

    叶彦; 章力; 黄甘颖; 李霞

    2015-01-01

    Objective To investigate and analyze the current situation of Toxoplasma ( TOX ) infection in reproductive population. Methods Five hundred pregnant women and 500 cases of healthy people without any symptoms of TOX infection were selected and grouped into pregnant group and health group. The general information and the history of exposure to pets of all the included objects, and the adverse pregnancy history of pregnant women in the pregnancy group were investigated and compared. Results There was no significant difference in TOX infection rate between health group and pregnant group (χ2 =1. 578, P >0. 05). The recent TOX infection rate of women who had pet exposure history in both groups was significantly higher than that without pet exposure history (χ2 value was 33. 196 and 20. 436, respectively, both P0.05)。健康组、孕妇组中有宠物接触史者的近期TOX感染率均显著高于无宠物接触史者(χ2值分别为33.196、20.436,均P<0.05)。孕妇组中具有不良妊娠史者的近期TOX感染率显著高于无不良妊娠史者(χ2=17.837,P<0.05)。孕妇组TOX感染知晓率显著高于健康组(χ2=27.127,P<0.05),年龄(<25岁)、非生物医学相关职业、居住地位于农村地区、学历较低(小学及以下)均是知晓TOX感染的危险因素( OR值分别为1.612、3.287、1.455、2.673,均P<0.05)。结论育龄人群的TOX感染知晓情况受多种人口学因素影响,TOX感染与孕妇不良妊娠史的发生具有相关性,宠物接触史可增加TOX感染风险。

  20. 大学生时间洞察力现状调查研究%Investigation and Research on the Current Situation of College Students' Insight into Time

    Institute of Scientific and Technical Information of China (English)

    张云霞

    2016-01-01

    本文以洛阳市3所高校学生为被试,通过《时间洞察力问卷》调查大学生时间洞察力状况。研究表明:大学生对未来时间的理解和体验有明确的认知,总体时间洞察力有待加强;女生未来时间洞察力显著高于男生;男生现在宿命时间洞察力显著高于女生;大二学生现在宿命时间洞察力显著高于大一学生;理工科学生现在宿命时间洞察力显著高于文科学生。结论:大学生存在不佳的时间偏向,总体时间洞察力水平不高,急需采取措施提高时间洞察力水平。%With students from 3 colleges of Luoyang City as the subject,"questionnaire on insight into time"was used to investi-gate the current situation of college students' insight into time. It was found in the research that: college students have a clear knowledge on the understanding and experience of future time, but the general insight into time still needs to be improved; fe-male students' insight into future time is significantly higher than that of male students;male students' insight into present destiny time is significantly higher than that of female students; sopho-mores' insight into present destiny time is significantly higher than that of freshmen; science and engineering students' insight into present destiny time is significantly higher than that of liberal arts students. Conclusion: College students' tendency towards time is poor and the general level of their insight into time is low, so urgent measures should be taken to improve the level of insight into time.

  1. 社区护士开展健康教育现状调查%Investigation on the current situation of community nurses to develop health education

    Institute of Scientific and Technical Information of China (English)

    周君妹

    2016-01-01

    目的:调查社区护士开展健康教育的现状,分析形成原因,为日后有效开展社区健康教育提供依据。方法:随机选取社区护士150例,通过问卷调查获取社区健康教育情况。结果:95.8%社区护士认为开展社区教育极其重要,94.7%护士到社区以发放宣传资料、利用宣传橱窗的方式开展健康教育,但能主动参与社区健康教育的仅29.8%,主要原因是社区护士本身缺乏健康教育知识、缺乏活动经费、人员不足、社区居民热情度不高等。结论:开展成功的社区健康教育,需要社区护士本身有较好素质和知识技能,也需要社区居民配合和经费。%Objective:To investigate the current situation of community nurses to develop health education,and analyze the formation reasons,and provide evidence for the effective development of community health education.Methods:150 cases of community nurses were randomly selected.The community health education situation was obtained through questionnaire survey. Results:95.8% community nurses thought that developing community education was extremely important.94.7% nurses developed health education by distributing publicity materials and using the way of propaganda window in community,but only 29.8% could actively participate in community health education.The main reason was community nurses lack of the health education knowledge,lack of activity funds,lack of personnel,not high community residents enthusiasm.Conclusion:Developing successful community health education needs than community nurses have a good quality and knowledge skills,also needs the community residents coordination and funds.

  2. Geocachers: Benefits sought and environmental attitudes

    Science.gov (United States)

    Ingrid E. Schneider; Kenneth E. Silverberg; Deborah Chavez

    2011-01-01

    Geocaching, an outdoor recreation activity that uses handheld Global Positioning Systems (GPS) to find hidden treasures demarcated on the Internet, emerged in 2000 and has engaged more than 5 million participants in more than 200 countries (www.geocaching.com). Agency responses to geocaching range from collaborative management to...

  3. Foreign Talent Sought for Chinese Detroit

    Institute of Scientific and Technical Information of China (English)

    2011-01-01

    @@ If there is one thing China does not lack, it is engineers: every year, hundreds of thousands of them graduate from Chinese universities.But in May, Beijing Automotive Group (BAIC), the state-owned carmaker, held its first German recruitment fairs in Stuttgart, Munich and Aachen, to hire engineers.In the same month, Dongfeng Motor, another large Chinese carmaker, went to Munich looking for talent, following in the steps of state-owned car manufacturers such as SAIC Motor Corp and ambitious private carmakers such as Geely. "Increasing numbers of Chinese carmakers are recruiting overseas, in Detroit, Stuttgart and Nagoya," says Ivo Naumann, head of consultants AlixPartners in Shanghai.

  4. 精神科门诊服药依从性现状调查%Current Condition Investigation of the Compliance in the Psychiatric Outpatients

    Institute of Scientific and Technical Information of China (English)

    杨杨; 胡昌清; 王刚

    2015-01-01

    目的:探讨精神科门诊服药依从性的现状。方法:采用自制一般资料调查表以及服药依从性量表对精神科门诊309例患者进行调查。结果:精神科门诊40.5%的患者不依从,其中精神分裂症、抑郁症和双相情感障碍中不依从比例分别为35.6%、44.6%和29.3%。曾忘记服药的占46.6%,对药物治疗作用和维持治疗持否定态度的比例分别为54.4%和69.6%。27.4%精神分裂症患者主要因为大意而忘记服药,抑郁症和双相情感障碍身体状况好时忘记服药,比例分别为44.1%和43.9%,停药者所占比例接近。门诊50.8%抑郁症患者对精神科药物治疗态度积极并且32.8%能坚持服药,比例高于其他两种疾病。药物副作用对依从性的负面影响在精神分裂症和双相情感障碍患者中较为明显。结论:调查结果显示精神科门诊患者服药依从性并不乐观,不同疾病影响依从性的因素也有所不同,应该针对不依从性的不同方面采取恰当的干预措施。%Objective:To explore the current condition of the compliance in the psychiatric outpatients.Method:309 psychiatric outpatients were investigated and used General Information Questionnaire and Medication Adherence Rating Scale. Result:The compliance of the psychiatric outpatients was poor,accounting for 40.5%.The rate of no-adherence in schizophrenia, depression and bipolar disorder was respectively 35.6%,44.6% and 29.3%.The rate of which they ever forgot to take medicine was 46.6%,the rates of which the patients think the effect of drug therapy was not good and think the maintenance therapy was useless for 54.4% and 69.6%.27.4% of schizophrenic outpatients forgot to take medicine mainly because of carelessness,the rate of depression and bipolar disorder patients who forgot to take medicine when they were well was respectively 44.1% and 43.9%.The attitude to the treatment of psychiatric drugs was positive in 50.8% of depression

  5. 浙江省养老护理员队伍现状调查分析%Current status investigation and analysis of carer team in Zhejiang province

    Institute of Scientific and Technical Information of China (English)

    张玲芝; 郭晶; 陈凌玉; 王飞; 李华; 詹传东; 贾纪刚

    2015-01-01

    Objective To investigate the work, training and living status of carers in Zhejiang, and analyze the main issues, so as to provide the corresponding measures of strengthening nursing team construction and improving elderly service quality. Methods Using cross section survey, the self design questionnaire investigated the work, training and living status of carers in 26 county areas. Results We handed out 1 200 questionnaire and collected 1 107 effective questionnaire with effective rate 92. 3%. The middle and old age for carers occupied 85. 1% (942/1 107), and middle school or below education background were 81. 8% (906/1 107);they mainly undertook the work of elderly daily life care including feeding, bathing and changing cloths;only 35. 7% (395/1 107) carer had certificate and 45. 4% (503/1 107) received training; 26. 9%(298/1 107) carer satisfied the current living status. Conclusions The carer team is the aging, has low income and benefits, and low professional quality and restricted social function, and so on problems, so we should enhance the carer′s pay and benefits, perfect professional system, and enhance their quality of life, so as to improve carer team′s whole quality.%目的:调查浙江省养老护理员的工作、培训及生活状况,分析存在的主要问题,为加强养老护理员队伍建设、提升养老护理服务质量提出对策。方法采用横断面调查法,自制问卷,对浙江省26个县区养老护理员的工作、培训及生活状况进行调查。结果共发放问卷1200份,回收有效问卷1107份,有效率为92.3%。从业人员中中老年占85.1%(942/1107),初中及以下占81.8%(906/1107),主要承担对老人的日常生活照料,包括喂饭、洗澡、更衣等基础工作;仅有35.7%(395/1107)护理员为持证上岗人员,45.4%(503/1107)接受过培训;对目前的生活状况感到很满意的占26.9%(298/1107)。结论养老护理员存在从业人员严重老化,行业薪酬福利及专业素质偏

  6. Current Situation Investigation of the Interactive Classroom Teaching (Ⅲ)%互动式课堂教学现状的调查(Ⅲ)

    Institute of Scientific and Technical Information of China (English)

    张亚; 王翀; 易龙; 廖晓兰

    2013-01-01

    A form of questionnaire by investigation was carried out to study the current situation of interactive class-room teaching in order to improve the quality of talent fosterage. The results showed that many teachers believed that the interest and intelligence of the students were the most important factors for interactive classroom teaching;second-ly, students'attitude towards study and individual mood may also affect the results of interactive classroom teaching. In respect of requirements for teachers in teacher-student interaction, 27% of students believed that teachers should be rigorous and methodical, 24% thought that teachers should be humorous, wit and concentrative, 13% considered teachers should be erudite, while 36% believed that teachers should not only be rigorous, humour and wit, and eru-dite, but also should have fairly strong capability of synthesis. When investigating the interactive role of teachers and students, 68% of teachers believed both teachers and students need mutual efforts, 16% of teachers thought it laid stress on teachers, 15% of teachers considered students should set store on, and some individual chose others. In ad-dition, when investigating the form of teacher-student interaction, 35% of students believed“the setting scene” work best results in classroom interaction, 28% considered that the effect of “debate competition” interaction will result well, 21% selected the style of “asking student by naming him or her” interaction, only a few students chose “visi-tors'book” as interaction. The results of this investigation provided references for universities and colleges to carry out interactive mode of teaching reformation.%为加强课堂教学改革,提高人才培养质量,采取问卷调查的形式对互动式课堂教学现状进行了研究。结果表明:多数教师认为学生的兴趣和智力是影响师生互动的重要因素,其次学习态度和个人情绪也会影响互动式课堂教学效果;在

  7. RESULTS OF CALCULATION-EXPERIMENTAL INVESTIGATIONS OF ELECTRO-THERMAL RESISTIBILITY OF SHEET STEEL SAMPLES TO ACTION OF RATIONED COMPONENTS OF PULSED CURRENT OF ARTIFICIAL LIGHTING

    Directory of Open Access Journals (Sweden)

    M.I. Baranov

    2016-06-01

    Full Text Available Purpose. Calculation and experimental researches of the electro-thermal resistibility of the steel sheet samples to action standard pulse current components of the artificial lightning with amplitude-time parameters (ATP, corresponded the requirements of normative documents of USA for SAE ARP 5412 & SAE ARP 5416. Methodology. Electrophysics bases of technique of high tensions and large impulsive currents (LIC, and also scientific and technical bases of planning of devices of high-voltage impulsive technique and measuring in them LIC. Сurrent amplitude ImA=±200 kA (with a tolerance of ±10 %; current action integral JA=2∙106 A2•s (with a tolerance of ±20 %; time, corresponding to the amplitude of the current ImA, tmA≤50 microseconds; the duration of the current flow τpA≤500 microseconds. Results. The results of the evaluation of the calculated and experimental studies of electro-thermal resistance of the samples of plates measuring 0,5 m  0,5 m stainless steel 1 mm thickness to the action on them artificial lightning impulse currents with rationed ATP on the requirements of normative documents of USA for SAE ARP 5412 & SAE ARP 5416. A pulse A- component have a first amplitude 192 kA, the corresponding time of 34 μs, and the duration aperiodic component amplitude 804 A, corresponding to the time 9 ms. It has been shown that the long C- component current of artificial lightning can lead to keyhole these samples. The diameter of the holes in this thin steel sheet, which is formed during the flow of current C- components can reach 15 mm. The results of calculation and experiment agree within 28 %. Originality. For the first time in world practice on the generator large pulsed currents experimental studies of resistibility of sheet steel samples to the action of artificial lightning currents with critical parameters. Practical value. Using the results obtained in the practice of lightning protection will significantly improve the

  8. Evaluation of the impact of the 2010 pyroclastic density currents at Merapi volcano from high-resolution satellite imagery, field investigations and numerical simulations

    Science.gov (United States)

    Charbonnier, S. J.; Germa, A.; Connor, C. B.; Gertisser, R.; Preece, K.; Komorowski, J.-C.; Lavigne, F.; Dixon, T.; Connor, L.

    2013-07-01

    The 2010 pyroclastic density currents (PDC) at Merapi have presented a rare opportunity to collect a uniquely detailed dataset of the source, extent, lateral variations and impact of various PDC deposits on a densely populated area. Using traditional volcanological field-based methods and a multi-temporal dataset of high-resolution satellite imagery, a total of 23 PDC events have been recognized, including 5 main channeled flows, 15 overbank flows derived from overspill and re-channelization of the main PDCs into adjacent tributaries and two main surge events. The 2010 PDC deposits covered an area of ~ 22.3 km2, unequally distributed between valley-filling (6.9%), overbank (22.4%) and surge and associated fallout deposits (71.7%). Their total estimated non-DRE volume is ~ 36.3 × 106 m3, with 50.2% of this volume accounting for valley-filling deposits, 39.3% for overbank deposits and 10.5% for surge and associated fallout deposits. More than 70% of the total volume was deposited during the third eruptive phase (4-5 November), and only 16.6%, 11.5% and 0.9% during the first (26-29 October), second (30 October - 3 November) and fourth phase (6-23 November), respectively. The internal architecture and lithofacies variations of the 2010 PDC deposits were investigated using data collected from 30 stratigraphic sections measured after one rainy season of erosion. The results show that complex, local-scale variations in flow dynamics and deposit architectures are apparent and that the major factors controlling the propagation of the main flows and their potential hazards for overbanking were driven by: (1) the rapid emplacement of several voluminous PDCs, associated with the steady infilling of the receiving landscape after the two first phases of the eruption; (2) longitudinal changes in channel capacity following increased sinuosity in the valley and decreased containment space; and (3) the effects of varying source mechanisms (gravitational dome collapse, vertical or

  9. Experimentally-Based Computational Investigation into Beat-To-Beat Variability in Ventricular Repolarization and Its Response to Ionic Current Inhibition.

    Directory of Open Access Journals (Sweden)

    E Pueyo

    Full Text Available Beat-to-beat variability in repolarization (BVR has been proposed as an arrhythmic risk marker for disease and pharmacological action. The mechanisms are unclear but BVR is thought to be a cell level manifestation of ion channel stochasticity, modulated by cell-to-cell differences in ionic conductances. In this study, we describe the construction of an experimentally-calibrated set of stochastic cardiac cell models that captures both BVR and cell-to-cell differences in BVR displayed in isolated canine action potential measurements using pharmacological agents. Simulated and experimental ranges of BVR are compared in control and under pharmacological inhibition, and the key ionic currents determining BVR under physiological and pharmacological conditions are identified. Results show that the 4-aminopyridine-sensitive transient outward potassium current, Ito1, is a fundamental driver of BVR in control and upon complete inhibition of the slow delayed rectifier potassium current, IKs. In contrast, IKs and the L-type calcium current, ICaL, become the major contributors to BVR upon inhibition of the fast delayed rectifier potassium current, IKr. This highlights both IKs and Ito1 as key contributors to repolarization reserve. Partial correlation analysis identifies the distribution of Ito1 channel numbers as an important independent determinant of the magnitude of BVR and drug-induced change in BVR in control and under pharmacological inhibition of ionic currents. Distributions in the number of IKs and ICaL channels only become independent determinants of the magnitude of BVR upon complete inhibition of IKr. These findings provide quantitative insights into the ionic causes of BVR as a marker for repolarization reserve, both under control condition and pharmacological inhibition.

  10. What makes a successful volume crime investigator?

    OpenAIRE

    2011-01-01

    This exploratory study sought to understand the role of volume crime investigators in the modern era. It attempted to gain officers` perceptions on the attributes required to be a successful at the role. In addition, the research sought to understand how modern investigators thought success should be defined and measured in relation to individual investigator performance. Chapter One explored previous research relating to police investigators and success, and identified the main research que...

  11. Investigation study on current situation of dust management in coal enterprises%煤炭企业粉尘控制现状调查研究

    Institute of Scientific and Technical Information of China (English)

    范红敏; 崔炜; 袁聚祥; 陈银苹; 徐应军; 高雯

    2011-01-01

    To know the current situation of dust administration and control, and questions existed in the dust management in coal enterprises, so as to provide evidences for formulating the plan of prevention for coal workers' pneumonoconiosis. Subjects and Methods Five coal enterprises were selected as field studies by the typical sampling method. Some coal workers, occupational health personnel, dust prevention workers and dust monitor personnel were investigated by face to face questionaire and qualitative interview. Historical data were collected from the files of the five coal enterprises and pneumoconiosis diagnostic data. Database was set up in Epidata3.0, and the data were analyzed by SAS. Results With the time going, the proportion of category Ⅰ pneumoconiosis gradually increased. Subjects were very aware of the dust hazard and the necessity of the measure for dust prevention while they were not very familiar with the country's law for dust control, the right for worker's health, and the supervision for dust. Among 478 Investigated coal workers, only 59. 4% of people knew that firm had distributed propaganda materials. The using percentage of preventive material for the workers who exposed to dust directly was only 72. 6%,and the percentage for those who use preventive material each time was less than 50%. Bad comfort of using prevention material might be the main reasons to refuse the using among workers. 18.8% of employees still did not make pre-service medical examination. The devices for preventing dust were more perfect and went well, but there still had existed phenomenons that some dustproof facilities were not running. Conclusions There remained some questions that Dust hazard and dust prevention knowledge were lack of publicity, occupational health examination work was not integrity, dust control measures were inadequate, and the monitoring for the dust concentration might have some bugs. The corresponding measures have to be taken in the dust

  12. Anodal transcranial direct current stimulation (tDCS) increases frontal-midline theta activity in the human EEG: a preliminary investigation of non-invasive stimulation.

    Science.gov (United States)

    Miller, Joe; Berger, Barbara; Sauseng, Paul

    2015-02-19

    Rhythmical brain activity in the range between four and eight Hz acquired over frontal-midline EEG recording sites - so called frontal-midline theta activity - is regarded as one of the most prominent neural signatures of sustained attention. It is reported to parametrically increase with cognitive load and is thought to be generated in medial prefrontal cortex. Here we explored the possibility of using anodal transcranial direct current stimulation over frontal sites to enhance frontal-midline theta activity and to increase sustained attention performance. We used a small preliminary sample to test a novel direct current stimulation electrode configuration by which we were able to significantly increase frontal-midline theta amplitude in a resting condition after the end of the stimulation period. Using standardised low resolution electromagnetic tomography analysis the effect in the surface EEG was localised to right prefrontal and left medial prefrontal brain areas. Transcranial direct current stimulation did, however, not have any impact on behavioural performance during a sustained attention task. This most likely was due to a very fast washout of the stimulation's after effect on theta activity. Although these are only preliminary results from a rather small sample, this study demonstrates that transcranial direct current stimulation can be used to rather selectively enhance frontal-midline theta amplitude.

  13. Investigations on contribution of glial inwardly-rectifying K+ current to membrane potential and ion flux: An experimental and theoretical study

    Directory of Open Access Journals (Sweden)

    Sheng-Nan Wu

    2015-01-01

    Full Text Available The inwardly rectifying K+ current [IK(IR] allows large inward K+ currents at potentials negative to K+ equilibrium potential (EK and it becomes small outward K+ currents at those positive to EK. How changes of such currents enriched in glial cells can influence the functions of glial cell, neurons, or both is not clearly defined, although mutations of Kir4.1 channels have been demonstrated to cause serious neurological disorders. In this study, we identified the presence of IK(IR in human glioma cells (U373 and U87 cells. The amplitude of IK(IR in U373 cells was subject to inhibition by amitriptyline, arecoline, or BaCl2. The activity of inwardly rectifying K+ channels was also clearly detected, and single-channel conductance of these channels was calculated to be around 23 pS. Moreover, based on a simulation model derived from neuron–glial interaction mediated by ion flux, we further found out that incorporation of glial IK(IR conductance into the model can significantly contribute to regulation of extracellular K+ concentrations and glial resting potential, particularly during high-frequency stimulation. Glial cells and neurons can mutually modulate their expression of ion channels through K+ ions released into the extracellular space. It is thus anticipated that glial IK(IR may be a potential target utilized to influence the activity of neuronal and glial cells as well as their interaction.

  14. Problem and current lines in investigations on the epidemiology of leishmaniasis and its control in the U.S.S.R.

    Science.gov (United States)

    Kellina, O I

    1981-01-01

    The present epidemiological situation of the three nosoforms of leismaniasis (i.e. anthroponotic cutaneous leishmaniasis, zoonotic cutaneous leishmainiasis and visceral leishmaniasis) in the U.S.S.R. is exposed. The current lines in inveestigation of their epidemiology are then presented, with special reference to the methods used and the results obtained for their control.

  15. The Current Situation of Students’ Participatation in Extracurricular Sports Activities of Private Middle School in Henan Province and the Analysis of Investigation

    Science.gov (United States)

    Zhe, Wang

    By using the methods of document literature, questionnaire survey and mathematical statistics, this paper investigates and analyses the cuurent situation of students' participation in extrucurricular sports activities of 36 private middle schools in Henan province which have legal education procedures through the following aspects: the attitude, motivation, times, duration, selection of programs, and influential factors of participating in extracurricular sports activities. Based on the investigation and analysis, this paper points out the existing problems and puts forward suggestions

  16. Use of cyclic current reversal polarization voltammetry for investigating the relationship between corrosion resistance and heat-treatment induced variations in microstructures of 400 C martensitic stainless steels

    Science.gov (United States)

    Ambrose, John R.

    1992-01-01

    Software for running a cyclic current reversal polarization voltammagram has been developed for use with a EG&G Princeton Applied Research Model 273 potentiostat/galvanostat system. The program, which controls the magnitude, direction and duration of an impressed galvanostatic current, will produce data in ASCII spreadsheets (Lotus, Quattro) for graphical representation of CCRPV voltammograms. The program was used to determine differences in corrosion resistance of 440 C martenstic stainless steel produced as a result of changes in microstructure effected by tempering. It was determined that tempering at all temperatures above 400 F resulted in increased polarizability of the material, with the increased likelihood that pitting would be initiated upon exposure to marine environments. These results will be used in development of remedial procedures for lowering the susceptibility of these alloys toward the stress corrosion cracking experienced in bearings used in high pressure oxygen turbopumps used in the main engines of space shuttle orbiters.

  17. Investigating the Marine Protected Areas most at risk of current-driven pollution in the Gulf of Finland, the Baltic Sea, using a Lagrangian transport model.

    Science.gov (United States)

    Delpeche-Ellmann, Nicole C; Soomere, Tarmo

    2013-02-15

    The possibility of current-driven propagation of contaminants released along a major fairway polluting the Marine Protected Areas (MPAs) in the Gulf of Finland, the Baltic Sea, is examined using a 3D circulation model, a Lagrangian transport model and statistics. Not surprisingly, the number of hits to the MPA decreases almost linearly with its distance from the fairway. In addition, the potential pollution released during a ship accident with the pollutants carried by currents may affect MPAs at very large distances. Typically, a fairway section approximately 125 km long (covering about 1/3 of the approximate 400-km-long gulf) may serve as a source of pollution for each MPA. The largest MPA (in the Eastern Gulf of Finland) may receive pollution from an approximately 210-km-long section (covering about 1/2 of the entire length of the gulf). This information may be useful in assisting maritime management.

  18. Preliminary Investigation of Seasonal Flow Patterns in the Somali Current and Arabian Sea Using a Synthesis of Surface Drifter and Satellite Altimeter D

    Science.gov (United States)

    2014-09-30

    largely governed by Ekman pumping over the equatorial gyre to the south of the equator. The mean surface velocity of the SECC from this 18-year time...of easterly wind stress south of the equator (Shenoi et al. 1999; Schott and McCreary 2001) (Fig. 2). In fact, southward Ekman currents at the surface...a) Ekman and (b) geostrophic velocities. The top panels show the principal component time series and the bottom panels show the spatial am- plitudes

  19. Observation and investigation of a dynamic inflection point in current-voltage curves for roll-to-roll processed polymer photovoltaics

    DEFF Research Database (Denmark)

    Medford, Andrew James; Lilliedal, Mathilde Raad

    2010-01-01

    Inflection point behaviour is often observed in the current-voltage (IV) curve of polymer and organic solar cells. This phenomenon is examined in the context of flexible roll-to-roll (R2R) processed polymer solar cells in a large series of devices with a layer structure of: PET-ITO-ZnO-P3HT......:PCBM-PEDOT:PSS-Ag. The devices were manufactured using a combination of slot-die coating and screen printing; they were then encapsulated by lamination using a polymer based barrier material. All manufacturing steps were carried out in ambient air. The freshly prepared devices showed a consistent inflection point in the IV...

  20. Structural, Optical, and Dielectric Investigations of the Relaxor PLZT 9,75/65/35 Ceramics Irradiated by High-Current Pulsed Electron Beam

    CERN Document Server

    Efimov, V V; Kalmikov, A V; Klevtsova, E A; Minashkin, V F; Novikova, N N; Sikolenko, V V; Skripnik, A V; Sternberg, A; Tiutiunnikov, S I; Yakovlev, V A

    2002-01-01

    First time comprehensive study of high-current pulsed electron irradiation effects on the structural, optical and dielectric properties of relaxor (Pb_{(1-x)}La^{x}(Zr_{0.65}Ti_{0.35})_{1-x/4}O_{3} ceramics with x=9.75% has been provided. The electron beam had the following parameters: energy E_{e}=250 keV, current density J_{e}=1000 A/cm^{2}, pulse duration tau = 300 ns, density 10^{15} electrons/cm^{2} per pulse. Infrared reflectivity spectra in the region of 100-2000 cm^{-1} were obtained in virgin, irradiated by 1500 pulses and annealed up to t=500^{circ}C ceramics. The reconstruction of perovskite ABO_{3} structure in irradiated samples has been studied by complex use of X-ray and neutron scattering and IR spectroscopy techniques revealing the changes in transverse and longitudinal phonon modes, oscillators strength and damping of modes. Radiation effects on temperature behaviour of dielectric permittivity in the region of phase transition were studied. The possible mechanisms of pulsed electron irradiat...

  1. Current Investigation and Analysis on Adolescent Adiposity in Beijing%对北京市肥胖青少年的现状调查与分析

    Institute of Scientific and Technical Information of China (English)

    孙璞; 夏淑敏

    2001-01-01

    In this paper, the author makes an investigation among 981 adolescents in Beijing. The result shows that the over-weight of adolescents reaches 26%. Through further investigation on these adolescents eating habit, sports condition and their psychology, the author put forwards five constructive suggestions for preventing adiposity.%本研究对北京市981名青少年进行调查,发现肥胖者高达26%。通过对这些肥胖青少年的饮食、运动以及心理等情况的深入研究与分析,提出了具有建设性的预防肥胖的5点措施。

  2. Observation and investigation of a dynamic inflection point in current-voltage curves for roll-to-roll processed polymer photovoltaics

    DEFF Research Database (Denmark)

    Medford, Andrew James; Lilliedal, Mathilde Raad

    2010-01-01

    Inflection point behaviour is often observed in the current-voltage (IV) curve of polymer and organic solar cells. This phenomenon is examined in the context of flexible roll-to-roll (R2R) processed polymer solar cells in a large series of devices with a layer structure of: PET-ITO-ZnO-P3HT...... that the findings are applicable to various other device structures based on semiconducting oxides. The findings may have influences on the possibilities and scale-up of polymer solar technologies.......:PCBM-PEDOT:PSS-Ag. The devices were manufactured using a combination of slot-die coating and screen printing; they were then encapsulated by lamination using a polymer based barrier material. All manufacturing steps were carried out in ambient air. The freshly prepared devices showed a consistent inflection point in the IV...

  3. Assessing dental students' competence: best practice recommendations in the performance assessment literature and investigation of current practices in predoctoral dental education.

    Science.gov (United States)

    Albino, Judith E N; Young, Stephen K; Neumann, Laura M; Kramer, Gene A; Andrieu, Sandra C; Henson, Lindsey; Horn, Bruce; Hendricson, William D

    2008-12-01

    In this article, the Task Force on Student Outcomes Assessment of the American Dental Education Association's Commission on Change and Innovation in Dental Education describes the current status of student outcomes assessment in U.S. dental education. This review is divided into six sections. The first summarizes the literature on assessment of dental students' performance. Section two discusses catalysts, with a focus on problem-based learning, for development of new assessment methods, while the third section presents several resources and guides that can be used to inform selection of assessment techniques for various domains of competence. The fourth section describes the methodology and results of a 2008 survey of current assessment practices in U.S. dental schools. In the fifth section, findings from this survey are discussed within the context of competency-based education, the educational model for the predoctoral curriculum endorsed by the American Dental Education Association and prescribed by the Commission on Dental Accreditation. The article concludes with a summary of assessments recommended as optimal strategies to measure three components of professional competence based on the triangulation model. The survey of assessment practices in predoctoral education was completed by 931 course directors, representing 45 percent of course directors nationwide, from fifty-three of the fifty-six U.S. dental schools. Survey findings indicate that five traditional mainstays of student performance evaluation-multiple-choice testing, lab practicals, daily grades, clinical competency exams, and procedural requirements-still comprise the primary assessment tools in dental education. The survey revealed that a group of newer assessment techniques, although frequently identified as best practices in the literature and commonly used in other areas of health professions education, are rarely employed in predoctoral dental education.

  4. A questionnaire-based survey investigating the current use of tranexamic acid in traumatic haemorrhage and elective hip and knee arthroplasty

    Science.gov (United States)

    Moondi, Parvez

    2014-01-01

    Objectives To record the current use of tranexamic acid during traumatic haemorrhage and elective arthroplasty of the hip and knee. Design A questionnaire-based postal survey. Setting The questionnaire was sent to the ‘anaesthetic lead’ at all acute trusts in England, excluding centres for children, women’s health, cancer and cardiac care. Participants Ninety-nine (66%) centres replied to the questionnaire. Main outcome measures Is tranexamic acid used as part of routine standardized treatment for traumatic haemorrhage and for elective hip and knee arthroplasty, and if so what dosage regime was administered? Results Few trusts (31%) use tranexamic acid during traumatic haemorrhage, with various dosages used. Its use in hip and knee arthroplasty was also low (38%) with a diverse range of doses prescribed. Conclusions Despite many trials showing its efficacy and low risk of side effect, it is clear that its use is not part of standard practice in most centres. Further studies could clarify these concerns and provide a definitive dosing schedule improving patient care and saving lives. PMID:25057371

  5. Adolescent idiopathic scoliosis: current perspectives

    Directory of Open Access Journals (Sweden)

    Miyanji F

    2014-01-01

    Full Text Available Firoz MiyanjiBritish Columbia Children's Hospital, Vancouver, BC, CanadaAbstract: Adolescent idiopathic scoliosis (AIS remains a common and potentially severe musculoskeletal disorder. Although its etiology is largely unknown, ongoing research endeavors continue to improve our understanding of its potential origin and its natural history. Advances in understanding its true three-dimensional nature have sought to improve classification and management strategies. This review will attempt to highlight and give an overview of the current concepts in adolescent idiopathic scoliosis.Keywords: AIS, current, natural history, management strategies

  6. 无锡市民家庭园艺消费现状研究%Investigation on current situation of consumption on home gardening in Wuxi residents

    Institute of Scientific and Technical Information of China (English)

    张珍; 包志毅

    2012-01-01

    The random questionnaires to residents about the basic situation of home gardening consumption, consumer psychology, consumption willingness to garden center and other status among seven administrative regions in Wuxi were conducted. The results show that 94.8% of residents have had to buy plants and garden supplies experience; One to two months visiting a flower market accounted for 35.2%; The annual mainly in the 100~500 yuan of spending on plants, gardening materials, maintenance costs accounted for 47.6%; the purpose of residents to buy home gardening products are mainly family and personal use; 40.9% of the people pay more attention to the appearance of home gardening products; most residents are not satisfied from the currently existing conditions of flower market; 74.5% of residents are willing to try to go to shopping at garden center; plants is preferred in garden center for consumers; hoping to know the home gardening products information of garden center by advertising media accounted for 29.4%. Low level of consumption, popular consumption, displeasure with the currently existing conditions of flower market, diversification of consumer demand, efficient communication channels to pay attention, look forward to the new consumer environment such as the garden center has become the basic characteristics of Wuxi residents consumption of home gardening.%在无锡市主要行政区域进行市民家庭园艺消费的基本情况、消费心理、花园中心消费意愿等现状的随机问卷调查。结果表明:有94.8%的市民有购买过植物及花园用品的经历;1~2个月逛1次花市的人占35.2%;而每年花销在植物、园艺资材、养护上主要在100~500元的占47.6%;市民购买家庭园艺产品主要是家庭和个人用;有40.9%的市民更注重家庭园艺产品的外观;绝大多数市民对于城市现有花市的条件不太满意、不太满足;有74.5%的市民愿意尝试去花园中心购物;植物类在花园中心

  7. Investigation on the Current Situation of Health Information Management Specialty%卫生信息管理专业现状的探讨

    Institute of Scientific and Technical Information of China (English)

    代清霞

    2016-01-01

    The requirements for medical management talents of the hospital are increasing continuously, while the development of health information management specialty is lagging behind the development of the hospital, which shows in aspects such as low education level, less enroll students and hard to find a job and so on. The primary causes of this current situation included indifference of the school ideally, the high requirements of the hospitals, the low entry qualification of the medical records work staff and imperfect of job titles of medical records specialty and so on. Aimed at the situation, the medical colleges should attach importance to the development of health information management specialty in policy, establish entry qualification examination, complete development pathways, hold up medical records megagame nationwide and strengthen the construction of teaching staff, so as to promote the development of the medical records management specialty, thus could we promote the development of medical records management of medical institutions.%医院对于病案管理人才的需求呈现不断增加的趋势,而医学院校卫生信息管理专业的发展却滞后于医院的发展。表现为办学层次偏低、招生人数较少、学生就业困难等。探讨形成这种现状的主要原因是办学单位观念上不重视、医院门槛设置过高、病案人员入职资格过低和病案专业职称发展不完善等。针对这种现状高等医学院校应从政策上重视引导卫生信息专业发展、设立行业入职资格考试、完善卫生信息专业职称发展路径、举办全国病案大赛及加强卫生信息管理专业师资建设等措施来促进卫生信息管理专业的发展,从而最终能推动医疗机构病案管理的发展。

  8. Investigation on current status of clinical research team building of traditional Chinese medicine%中医临床研究团队建设现状研究

    Institute of Scientific and Technical Information of China (English)

    李屹; 汪瑾; 朱惠蓉

    2014-01-01

    This article introduced several concepts about clinical research team building of traditional Chinese medicine and raised current problems:personnel structure and member collaboration of the team were poor,staff major in medicine had imbalanced knowledge structure within medical area and the structure of team learning margin was unitary. Members in the team had not been influenced enough by the team. Some suggestions were put forward at last. Reasonable structure of the team should be established,which included selecting the appropriate academic leader and backbone and training qualified excellent team members. Effective methods should be used to form a sense of superiority and mission among team members. Through understanding the main problems and tasks in different stages of the team, team members could provide assistance and support more innovatively,lively,and modernly for the whole team.%阐述了中医临床研究团队建设相关的几个概念,揭示了其目前存在的问题:中医临床研究团队的配置与协作有硬伤,医学人才“偏科”现象严重,研究团队学缘结构单一;研究团队对成员个人的影响力尚未形成。提出对策建议:构建合理的研究团队结构,包括选择合适的学术带头人,适合的学术研究骨干和培养合格乃至优秀的团队成员;通过有效手段促使团队成员形成团队优越感与使命感,通过了解研究团队建设不同阶段的主要问题与任务,以更新颖、活泼、现代化方式行使医院人力资源部门职能,为中医临床研究团队的建设提供协助与保障。

  9. 呼和浩特市孕妇碘营养现状调查%Investigation on the current situation of iodine nutrition of pregnant women in Hohhot

    Institute of Scientific and Technical Information of China (English)

    杨缨; 骆学东; 王瑞; 武怡; 张惠

    2012-01-01

    Objective: To understand the current situations of urine iodine level and iodized salt usage of pregnant women, provide a scientific basis for carrying out iodine nutrition intervention among pregnant women. Methods: Five hundred pregnant women who received antenatal care in the hospital from March to May in 2010 for the first time were selected as study objects, national standard arsenic and cerium catalysis spectrophotometry was used to detect urine iodine, the usage of iodized salt was detected by a questionnaire. Results: The incidences of low iodine, appropriate iodine, and high iodine among the pregnant women were 21.6% , 51.2% , and 27. 2% , respectively. No pregnant women with excessive iodine exceeding human discomfort toleranc was found; the incidence of abnormal iodine level among the rural pregnant women with low educational level was significantly higher than that among the urban pregnant women with high educational level; the correct rate of usage of iodized salt among pregnant women was low. Conclusion: Iodine deficiency and excessive intake of iodine existed in the pregnant women in Hohhot, and the incidences were high. Thus, relevant departments should carry out iodine nutrition monitoring and guidance among pregnant women.%目的:了解孕妇尿碘水平、碘盐使用现状,为进行孕妇碘营养干预提供科学依据.方法:以2010年3~5月首次到内蒙古妇幼保健院进行孕期保健的500名呼和浩特市孕妇为调查对象,采用国标砷铈催化分光光度法进行其尿碘测定并对碘盐使用情况进行问卷调查.结果:孕妇低碘率为21.6%,适碘率为51.2%,高碘率为27.2%,未发现超过人体耐受量的高碘者;文化程度低的农村孕妇碘水平异常者较文化程度高的城市孕妇多;孕妇碘盐使用的正确率较低.结论:呼和浩特市孕妇碘缺乏、碘摄入过多均存在,且发生率均较高.因此,相关部门应该及时进行孕妇的碘营养监测和指导工作.

  10. Investigation of unsaponifiable matter of plant oils and isolation of eight phytosterols by means of high-speed counter-current chromatography.

    Science.gov (United States)

    Schröder, Markus; Vetter, Walter

    2012-05-11

    Phytosterols are minor components of plant oils. Due to their beneficial effect on human serum cholesterol level, new products supplemented with phytosterols have been marketed. Commercial phytosterol standards are frequently of insufficient purity, very expensive, only available in (semi-) synthetic form or not available at all. For this reason we aimed to explore the unsaponifiable matter of three plant oils (rapeseed oil, linseed oil and olive oil) in order to study their compositions and to purify several phytosterols. We fractionated ∼ 100 mg of the unsaponifiable matter of the plant oils with high-speed counter-current chromatography (HSCCC) by the combination of an enrichment step and a purification step. In the first part (enrichment step) composition of phytosterols, alkanes, fatty alcohols from 14:0 to 30:0 including isomers, 15-nonacosanone and other ketones as well as further minor compounds in the different fractions was studied by GC/MS. By means of the solvent system n-hexane/methanol/aqueous silver nitrate solution (34/24/1, v/v/v) in normal phase mode (tail-to-head) β-sitosterol could be isolated (6.4 mg, purity ≥ 99%) and several phytosterols (e.g. citrostadienol, cycloeucalenol and erythrodiol) could be enriched. Moreover, the fast eluting hydrocarbons squalene and nonacosane as well as the later eluting phytol (pure, 7 mg) and geranyl geraniol could also be efficiently enriched. Suited HSCCC fractions from the three plant oils were merged and re-injected into the HSCCC system (purification step). The HSCCC purification step provided 6.9 mg campesterol (≥ 99%), 2.9 mg brassicasterol (≥ 99%), 0.3mg Δ5-avenasterol (≥ 90%), 9.5mg cycloartenol (≥ 90%), 3.7 mg 24-methylene-cycloartanol (≥ 99%), and ∼ 1mg of an unknown compound (∼ 80%) isolated from rapeseed and linseed oil. Furthermore, the combined HSCCC enrichment and purification of a hydrogenated sterol standard provided two pure phytostanols (campestanol ≥ 99% and sitostanol

  11. Quality of life, mental health and health beliefs in haemodialysis and peritoneal dialysis patients: Investigating differences in early and later years of current treatment

    Directory of Open Access Journals (Sweden)

    Tomaras V

    2008-11-01

    Full Text Available Abstract Background The study examines differences regarding quality of life (QoL, mental health and illness beliefs between in-centre haemodialysis (HD and continuous ambulatory peritoneal dialysis (CAPD/PD patients. Differences are examined between patients who recently commenced treatment compared to patients on long term treatment. Methods 144 End-Stage Renal Disease (ESRD patients were recruited from three treatment units, of which 135 provided full data on the variables studied. Patients consisted of: a 77 in-centre haemodialysis (HD and 58 continuous ambulatory peritoneal dialysis (CAPD/PD patients, all currently being treated by dialysis for varied length of time. Patients were compared for differences after being grouped into those who recently commenced treatment ( 4 years. Next, cases were selected as to form two equivalent groups of HD and CAPD/PD patients in terms of length of treatment and sociodemographic variables. The groups consisted of: a 41 in-centre haemodialysis (HD and b 48 continuous ambulatory peritoneal dialysis (CAPD/PD patients, fitting the selection criteria of recent commencement of treatment and similar sociodemographic characteristics. Patient-reported assessments included: WHOQOL-BREF, GHQ-28 and the MHLC, which is a health locus of control inventory. Results Differences in mean scores were mainly observed in the HD patients with > 4 years of treatment, providing lower mean scores in the QoL domains of physical health, social relationships and environment, as well as in overall mental health. Differences in CAPD/PD groups, between those in early and those in later years of treatment, were not found to be large and significant. Concerning the analysis on equivalent groups derived from selection of cases, HD patients indicated significantly lower mean scores in the QoL domain of environment and higher scores in the GHQ-28 subscales of anxiety/insomnia and severe depression, indicating more symptoms in these areas

  12. Summary of Tertiary investigations in western Saudi Arabia, current work by the U.S. Geological Survey and recommended future studies

    Science.gov (United States)

    Hadley, Donald G.; Schmidt, Dwight Lyman; Coleman, Robert Griffin

    1983-01-01

    In 1936, geologic work related to the Tertiary System in western Saudi Arabia began with a study of the Umm Gerad barite deposit by K. S. Twitchell. In 1944, a study focusing specifically on Tertiary rocks was conducted by Steineke and others near Jiddah. Small-scale mapping of Tertiary sequences began in 1950 in southwestern Saudi Arabia and later in northern 3audi Arabia as part of the Kingdom's early mapping program. These studies were part of a larger program being directed by the Government of Saudi Arabia in connection with mineral resource investigations. In the mid- to late-1960's, the Bureau de Recherches Geologiques et Minieres discovered mineralized Tertiary rocks al Jabal Dhaylan and began a study, which continues to the present, of both the Tertiary rocks and the mineralization. Following a number of early local studies, in 1973 the U.S. Geological Survey began detailed study of the Tertiary layered rocks along the Red Sea coastal plain south of Jiddah. More recently, Riofinex and Seltrust have been exploring for selected commodities in Tertiary sequences of northwestern Saudi Arabia and the Red Sea coastal plain. Results of these studies, including work by the Saudi Arabian Directorate General of Mineral Resources and the Saudi government agency preceding it, are summarized in this report. Characteristics of the Tertiary rocks south of lat 23? N. and the Tertiary mineral deposits of western Saudi Arabia are also summarized. Recommendations are made for future geologic studies and mineral assessment of the Tertiary rocks of western Saudi Arabia.

  13. Investigation of Current Situation of Learning Motivation, Social Anxiety and Loneliness of the Left-behind Children in Rural Primary School

    Directory of Open Access Journals (Sweden)

    Zhang Biyun

    2015-01-01

    Full Text Available Objective: To understand the situation of learning motivation, social anxiety and loneliness of the left-behind children. Method: Selecting three rural primary schools in Xian’an District of Xianning City to investigate left-behind situation, learning motivation, social anxiety and loneliness of pupils in Grades 4 to 6 in rural primary school in Xian’an District by the use of the MAAT-I-A which is revised by Zhou Bucheng, the Social Anxiety Scale for Children (SASC and the Children’s Loneliness Scale (CLS. Results: (1 The learning motivation of the left-behind children in rural primary school is in a slightly higher medium level. Social anxiety is significantly higher than normal level in Chinese city, and the level of loneliness of about 1/5 of the left-behind children is relatively high. (2 The score of learning motivation, social anxiety and loneliness of the left-behind children in the level of knowledge learning has significant grade differences, without significant gender differences. (3 The level of learning motivation, social anxiety and loneliness of the left-behind children is slightly higher than that of non-left-behind children, but both differences are not significant.

  14. An investigation of current and future satellite and in-situ data for the remote sensing of the land surface energy balance

    Science.gov (United States)

    Diak, George R.

    1994-01-01

    This final report from the University of Wisconsin-Madison Cooperative Institute for Meteorological Satellite Studies (CIMSS) summarizes a research program designed to improve our knowledge of the water and energy balance of the land surface through the application of remote sensing and in-situ data sources. The remote sensing data source investigations to be detailed involve surface radiometric ('skin') temperatures and also high-spectral-resolution infrared radiance data from atmospheric sounding instruments projected to be available at the end of the decade, which have shown promising results for evaluating the land-surface water and energy budget. The in-situ data types to be discussed are measurements of the temporal changes of the height of the planetary boundary layer and measurements of air temperature within the planetary boundary layer. Physical models of the land surface, planetary boundary layer and free atmosphere have been used as important tools to interpret the in-situ and remote sensing signals of the surface energy balance. A prototype 'optimal' system for combining multiple data sources into a three-dimensional estimate of the surface energy balance was developed and first results from this system will be detailed. Potential new sources of data for this system and suggested continuation research will also be discussed.

  15. Current Status of Malignant Neuropathic Pain in Chinese Patients with Cancer: Report of a Hospital-based Investigation of Prevalence, Etiology, Assessment, and Treatment.

    Science.gov (United States)

    Lu, Fan; Song, Li; Xie, Tian; Tian, Jie; Fan, Yuchao; Liu, Hui

    2017-01-01

    This study investigated the prevalence, etiology, assessment, treatment of pain in patients with cancer as well as their quality of life (QOL). Patients at the West China Hospital Cancer Center were invited to complete a questionnaire under the guidance of pain specialists. The questionnaire included general information, cancer pain status, its assessment, use of analgesics, and the effects of pain on QOL. In total, 1,050 patients were enrolled in the study. Of these, valid data were collected from 919 patients, among whom 454 (49.4%) suffered from pain, including 333 (36.2%) patients who had neuropathic pain symptoms. On average, the visual analog scale (VAS) score of patients with cancer pain was 3.30 ± 1.68. Significant differences in the VAS score and pain frequency between patients with nociceptive and neuropathic pain were observed (both P pain ranked first (64, 52.9%) among the patients with nociceptive pain, whereas pins and needles pain (97, 64.7%) was the most common type of pain in patients with neuropathic pain. There was a significant difference in QOL between the nociceptive and neuropathic pain groups (P pain used analgesics. Compared with the patients with pain not using any analgesics, those receiving analgesics had a significantly lower average pain relief rate (P = 0.027). Adjuvant analgesics were inadequately used (9.3%) in patients with neuropathic cancer pain. This study revealed the prevalence of neuropathic cancer pain in Chinese patients with cancer. Malignant neuropathic pain significantly impaired the patients' QOL. Insufficient assessment and inadequate analgesia still exist. These require more awareness and attention from both doctors and patients. © 2016 World Institute of Pain.

  16. Investigation of Structural, Compositional and Anti-Microbial Properties of Copper Thin Film Using Direct Current Magnetron Sputtering for Surgical Instruments

    Science.gov (United States)

    Kalaiselvam, S.; Sandhya, J.; Krishnan, K. V. Hari; Kedharnath, A.; Arulkumar, G.; Roseline, A. Ameelia

    Surgical instruments and other bioimplant devices, owing to their importance in the biomedical industry require high biocompatibility to be used in the human body. Nevertheless, issues of compatibility, bacterial infections are quite common in such devices. Hence development of surface coatings on various substrates for implant applications is a promising technique to combat the issues arising in these implant materials. The present investigation aims at coating copper on stainless steel substrate using DC Magnetron sputtering which is used to achieve film of required thickness (0.5-8μm). The deposition pressure, substrate temperature, power supply, distance between the specimen and target are optimized and maintained constant, while the sputtering time (30-110min) is varied. The sputtered copper thin film’s morphology, composition are characterized by SEM and EDAX. X-ray diffraction analysis shows copper oriented on (111) and (002) and copper oxide on (111) planes. The contact angle of copper thin film is 92∘ while AISI 316L shows 73∘. The antimicrobial studies carried in Staphylococcus aureus, Escherichia Coli, Klebsiella pneumonia and Candida albicans show that the maximum reduction was seen upto 35, 26, 54, 39CFU/mL, respectively after 24h. The cell viability is studied by MTT assay test on Vero cell line for 24h, 48h and 72h and average cell viability is 43.85%. The copper release from the thin film to the culture medium is 6691μg/L (maximum) is estimated from AAS studies. The copper coated substrate does not show much reaction with living Vero cells whereas the bacteria and fungi are found to be destroyed.

  17. Investigation of current status of sharp instrument injuries in 1320 medical staff%1320名医务人员锐器伤现状调查分析

    Institute of Scientific and Technical Information of China (English)

    田青; 吕婕; 李蕾

    2012-01-01

    目的 对医务人员锐器伤情况进行回顾性调查,以期对锐器伤的预防和处理提供指导.方法 采用复旦大学附属中山医院设计的调查问卷,对1320名医务人员在2011年8月1 -31日的锐器伤发生情况进行调查.结果 共发放1320份问卷,均为有效问卷;27名医务人员发生锐器伤,其中护士22人,占81.48%,为锐器伤发生的主要人群,锐器伤发生场地主要在普通病房,占45.71%,造成锐器伤发生的医疗器械主要是一次性注射器,占54.29%,造成锐器伤的发生时机主要为补液配置,占51.43%;有68.86%的被调查者参加过培训,仅有8.57%的伤者报告了锐器伤.结论护士是锐器伤发生的高危人群,应加强重点部门锐器伤的防护培训;锐器伤的发生率较高,但是上报率较低;发布与宣传血源性职业暴露的防护指南十分关键.%OBJECTIVE To survey the current situation of the sharp instrument injuries in clinical staff, and to provide scientific evidence for the prevention and treatment of sharp instrument injuries. METHODS A total of 1320 medical staff were surveyed during 1st Aug to 31st Aug, 2011 on sharp injuries with the questionnaires designed by Zhongshan Hospital Affiliated to Fudan University. RESULTS All the 1320 distributed questionnaires were valid;there 27 medical staff who suffered the sharp instrument injuries, including 22 nurses (81. 48%); injured; and the general ward was ranked as the highest risk department for sharp injuries(45. 71%); the disposable syringes (54. 29%) were the major medical equipments which caused sharp injuries. Drug reconstitution(51. 43%) was the key link where the sharp injuries occurred. There were 68. 86% of the respondents who had ever attended the related training, and only 8. 57% of the injured respondents reported their sharp injuries. CONCLUSIONS The nurses are the population at high risk of sharp injuries; the training about the prevention of sharp injuries in key

  18. Investigation on Current Situation and Influence Factors of Children Obesity%儿童肥胖现状及影响因素调查

    Institute of Scientific and Technical Information of China (English)

    黄金萍

    2015-01-01

    ObjectiveSurvey of childhood obesity, and analyze its influencing factors for the implementation of the education system and families to provide a reliable basis for intervention. Methods 1 863 will be randomly selected children aged 4 to 15 years of the study, in the form of a questionnaire survey to collect information to the diagnostic criteria of obesity as BMI, using the recommended index≥ 28.0 kg / m2 children into normal group and the obese group.Results For the number of obese children in 235 cases, accounting for 12.6%, which accounted for 7.8% of male children, female children accounted for 4.8%. Factors display: a family history of obesity, nutritional food additives, excessive meat, add solid foods too early for a major risk factor for childhood obesity.Conclusion The city's current child obesity rate was signiifcantly higher than previous levels, and showed a gradual upward trend, so the implementation of early intervention to prevent obesity, adolescence and adulthood is significant for children to maintain a normal body weight can effectively reduce the incidence of other diseases.%目的:通过调查我市儿童肥胖的现状,分析其影响因素,为教育系统和家庭实施干预提供可靠依据。方法将随机抽取1863名年龄在4~15岁的儿童作为研究对象,采用问卷的形式收集调查资料,以BMI作为肥胖诊断标准,采用国内推荐的指数≥28.0 kg/m2将儿童分成正常组和肥胖组。结果属于肥胖儿童的数量为235例,占据12.6%,其中男性儿童占据7.8%,女性儿童占据4.8%。影响因素显示:家族肥胖史、营养食品添加、肉食过量、过早添加固体食物为儿童肥胖的主要危险因素。结论 我市当前儿童的肥胖率明显高于以往水平,并呈现逐渐上升趋势,因此实施早期干预措施对预防青春期和成年期肥胖意义重大,儿童保持正常体重能够有效减低其他疾病的发生率。

  19. Investigation on the current situation of mental health institutions in Chengdu%成都市精神卫生医疗机构现状调查

    Institute of Scientific and Technical Information of China (English)

    任华; 秦小荣; 李慧; 何昌九; 代光智; 贾勇

    2016-01-01

    目的:了解成都市精神卫生医疗机构现状。方法自制调查表,于2013年9月12日-10月30日,通过电子邮件向全市具备精神科执业范围的医疗机构发放调查表,调查基准时间为2013年9月1日,所有数据经 Excel、SPSS18.0进行描述性分析。结果截止2013年9月,成都市拥有不同级别、等级及隶属关系的精神卫生医疗机构27家,分布以中心城区为主,存在5个精神科床位空白区县。精神卫生工作人员2505人。精神科核定床位3133张,实际开放床位5298张,床位密度2.67张/万人,编制床位床均建筑面积53 m2,实际开放床位床均建筑面积31 m2。经费来源,医院业务收入占90.8%,精神科财政补助占2.4%,多集中在地市级机构,平均设备总值为806.69万元,而乡镇级机构的平均设备总值仅为49.50万元。2012年共接收门诊患者450260人次、出院24698人次,精神科医生平均年负担门诊832人次、住院46人次。病床使用率中位数94.6%,平均住院日中位数70天。自2006年,各类重性精神疾病患者住院人次有不同程度的增长,其中以精神分裂症患者为主,2012年较2006年增幅达65%。结论成都市精神卫生机构配置不足,分布不均,投入不足,难以满足逐渐增长的精神卫生服务需求。%Objective To find out the current situation of mental institutions in Chengdu. Methods We gave out the self -made questionnaire to all the medical institutions which have psychiatric practice through the E - mail from September 12 to October 30,2013. Time up to September 1,2013. All data were analyzed by the SPSS 18. 0 and Excel. Results There were in total 27 men-tal healthcare institutions with different levels in Chengdu until September 1,2013. These mental healthcare institutions were mainly located in central urban area. Among them,there were five institutions without psychiatric inpatient beds. There were 2505 mental health

  20. Current evidence of coronary artery bypass grafting off-pump versus on-pump: a systematic review with meta-analysis of over 16,900 patients investigated in randomized controlled trials†.

    Science.gov (United States)

    Deppe, Antje-Christin; Arbash, Wasim; Kuhn, Elmar W; Slottosch, Ingo; Scherner, Maximilian; Liakopoulos, Oliver J; Choi, Yeong-Hoon; Wahlers, Thorsten

    2016-04-01

    In the present systematic review with meta-analysis, we sought to determine the current strength of evidence for or against off-pump and on-pump coronary artery bypass grafting (CABG) with regard to hard clinical end-points, graft patency and cost-effectiveness. We performed a meta-analysis of only randomized controlled trials (RCT) which reported at least one of the desired end-points including: (i) major adverse cardiac and cerebrovascular events (MACCE), (ii) all-cause mortality, (iii) myocardial infarction, (iv) cerebrovascular accident, (v) repeat revascularization, (vi) graft patency and (vii) cost-effectiveness. The pooled treatment effects [odds ratio (OR) or weighted mean difference, 95% confidence intervals (95% CIs)] were assessed using a fixed or random effects model. A total of 16 904 patients from 51 studies were identified after literature search of the major databases using a predefined keyword list. The incidence of MACCE did not differ between the groups, neither during the first 30 days (OR: 0.93; 95% CI: 0.82-1.04) nor for the longest available follow-up (OR: 1.01; 95% CI: 0.92-1.12). While the incidence of mid-term graft failure (OR: 1.37; 95% CI: 1.09-1.72) and the need for repeat revascularization (OR: 1.55; 95% CI: 1.33-1.80) was increased after off-pump surgery, on-pump surgery was associated with an increased occurrence of stroke (OR: 0.74; 95% CI: 0.58-0.95), renal impairment (OR: 0.79; 95% CI: 0.71-0.89) and mediastinitis (OR: 0.44; 95% CI: 0.31-0.62). There was no difference with regard to hard clinical end-points between on- or off-pump surgery, including myocardial infarction or mortality. The present systematic review emphasizes that both off- and on-pump surgery provide excellent and comparable results in patients requiring surgical revascularization. The choice for either strategy should take into account the individual patient profile (comorbidities, life expectancy, etc.) and importantly, the surgeon's experience in performing on

  1. 农村妇女围绝经期综合症现况调查%INVESTIGATION ON THE CURRENT STATUS OF MENOPAUSAL SYNDROME IN RURAL WOMEN

    Institute of Scientific and Technical Information of China (English)

    徐玉珍; 陈长香; 李向飞; 吴安娜; 邢琰

    2011-01-01

    [目的]了解广大农村地区围绝经期妇女围绝经期综合症发生情况及相关因素,为农村围绝经期妇女的健 康教育提供依据.[方法]采用统一的问卷在黑龙江、河南、陕西、河北、四川5省随机调查900名45~55岁围绝经期妇女,问卷由基本资料部分、改良更年期Kupperman评分表和抑郁量表(CES-D)组成.[结果]农村围绝经期妇女围绝经期综合症患病率为79.30%,主要症状依次为疲乏、情绪波动、失眠、骨关节痛、头痛、性生活、眩晕、感觉异常、抑郁疑心、潮热出汗、泌尿感染和心悸.围绝经期综合症的发生与年龄、子女数量、关注围绝经期知识、一般疾病治疗和家庭功能等因素有关.同时围绝经期综合症影响抑郁,有统计学意义,P<0.01.[结论]围绝经期综合症严重影响妇女健康,应采取有针对性的措施.%[Objective] To understand the vast rural areas in menopausal women of menopausal syndrome incidence and related factors, the menopausal women in rural areas to provide evidence of health. [Methods] One unified questionnaire was taken to investigate 900 menopausal women aged 45-55 years cases in Heilongjiang, Henan, Shanxi, Hebe and Sichuan Province, and some basic information were randomly surveyed from the questionnaire, including menopausal Kupperman score table and Depression Scale (CES-D) form. [Results] Rural menopausal syndrome prevalence was 79.30%, the main symptoms were fatigue, mood swings, insomnia, bone and joint pain, headache, sexual life, dizziness, abnormal sensation, depression, suspicion, hot flushes out Khan, urinary tract infection and heart palpitations. Climacteric syndrome was related to age, number of children, concerns of menopausal knowledge, general disease treatment and family function and other factors. Penopausal syndrome also affected depression, there was significant difference (P < 0.01). [Conclusion] Menopausal Syndrome seriously affected the

  2. The investigation on current situation of patients with cancer-related pain%恶性肿瘤患者疼痛现状调查研究

    Institute of Scientific and Technical Information of China (English)

    罗稀; 马洪丽; 唐小丽; 杨慧; 王国蓉

    2015-01-01

    Objective In order to provided a reference for pain management of patients in hospital,we investigated the control of cancer pain of inpatients after the activity of the establish of good pain management. Method Patients with cancer-ralated pian was investegated by basic information questionnaire and brief pain inventory. Totally 110 subjects finished the evaluation,98 valid questionnaire, the effective rate was 89. 1%. Result In the face of pain 47. 9% of the patient choose to endure pain as far as possible. In the last 24 hours 75. 5% of patients get pain con-troled, but there are still 37. 8% of the patients are in middle and severe pain, within the past 24 hours,42. 9% of patients the average pain was in the middle and severe pain, 64. 3% of patients was in the middle and severe pain, 25. 5% of patients the slightest pain was in a moderate pain. The influence of cancer pain on patients’ daily work, sleep, daily life and emotional degree is higher. Conclusion Health education of patients with cancer-related pain and pain standardized management should be strengthen.%目的:了解“癌性疼痛规范化治疗示范病房”创建活动开展后院内的癌性疼痛控制情况,为进一步开展院内癌性疼痛管理提供参考依据。方法采用基本资料调查表和简明疼痛问卷对诊断为恶性肿瘤并伴有癌性疼痛的患者进行调查。共发放问卷110份,有效问卷98份,有效率为89.1%。结果所有参与调查的癌性疼痛患者中面对疼痛有47.9%的患者选择尽量忍受疼痛;在过去24小时内75.5%的患者疼痛得到了较好的控制,但仍有37.8%的患者目前正处于中、重度疼痛中,42.9%的患者24小时的平均疼痛处于中、重度疼痛范围,过去24小时仍有64.3%的患者出现过中、重度爆发性疼痛,有25.5%的患者最轻微的疼痛处于中度疼痛范围。疼痛对患者日常工作、睡眠、日常生活及情绪的影响程度较高。结论需要加强癌

  3. Influence of the skin effect and current risetime on the fragmentation of wires by pulsed currents

    Science.gov (United States)

    Wall, D. P.; Allen, J. E.; Molokov, S.

    2005-07-01

    This study considers the physical phenomenon whereby wires may fragment in the solid state when subject to a sufficiently high pulsed electric current. A mathematical model is constructed within continuum mechanics which considers both Lorentz force and thermal mechanisms for the creation of stress waves in a wire. Previous studies are extended by including the skin effect, that is allowing for the diffusion of current density across the wire, and also investigating the influence of current risetime. Axisymmetric solutions are sought for rigid-lubricated, clamped, and free wire ends. Analytical solutions are obtained for the case of rigid-lubricated wire ends, while for the other cases the governing equations are solved numerically using an application-specific explicit finite-difference scheme, which is staggered in time and space. The inclusion of the skin effect leads to significant qualitative and quantitative differences in results. For example, in some cases we find tension in the longitudinal (τzz) stress component, which experiments suggest to be responsible for the fragmentation process, while the uniform-current model predicts compression. In most cases, the inclusion of the skin effect leads to higher peak tensile τzz stresses. Some understanding of the present results is gained with reference to analytical quasistatic solutions. Stresses generated by the Lorentz force mechanism are found to be more sensitive than those generated by the thermal mechanism to the current risetime. In both cases axial stresses increase with decreasing current risetime. Despite the differences in the results obtained with the inclusion of the skin effect, our results support the broad conclusions of the uniform-current model results; the largest stresses are found at the clamps for a wire with clamped ends, while the largest stresses in a wire with free ends are generated by the thermal mechanism and are located at the center of the wire.

  4. Spin current

    CERN Document Server

    Valenzuela, Sergio O; Saitoh, Eiji; Kimura, Takashi

    2012-01-01

    In a new branch of physics and technology called spin-electronics or spintronics, the flow of electrical charge (usual current) as well as the flow of electron spin, the so-called 'spin current', are manipulated and controlled together. This book provides an introduction and guide to the new physics and application of spin current.

  5. Current limiters

    Energy Technology Data Exchange (ETDEWEB)

    Loescher, D.H. [Sandia National Labs., Albuquerque, NM (United States). Systems Surety Assessment Dept.; Noren, K. [Univ. of Idaho, Moscow, ID (United States). Dept. of Electrical Engineering

    1996-09-01

    The current that flows between the electrical test equipment and the nuclear explosive must be limited to safe levels during electrical tests conducted on nuclear explosives at the DOE Pantex facility. The safest way to limit the current is to use batteries that can provide only acceptably low current into a short circuit; unfortunately this is not always possible. When it is not possible, current limiters, along with other design features, are used to limit the current. Three types of current limiters, the fuse blower, the resistor limiter, and the MOSFET-pass-transistor limiters, are used extensively in Pantex test equipment. Detailed failure mode and effects analyses were conducted on these limiters. Two other types of limiters were also analyzed. It was found that there is no best type of limiter that should be used in all applications. The fuse blower has advantages when many circuits must be monitored, a low insertion voltage drop is important, and size and weight must be kept low. However, this limiter has many failure modes that can lead to the loss of over current protection. The resistor limiter is simple and inexpensive, but is normally usable only on circuits for which the nominal current is less than a few tens of milliamperes. The MOSFET limiter can be used on high current circuits, but it has a number of single point failure modes that can lead to a loss of protective action. Because bad component placement or poor wire routing can defeat any limiter, placement and routing must be designed carefully and documented thoroughly.

  6. Numerical Simulation Investigation on Hydraulic Performance of the Horizontal-Axis Tidal Current Turbine%水平轴潮流水轮机水力性能的数值模拟研究

    Institute of Scientific and Technical Information of China (English)

    肖惠民

    2015-01-01

    Three-dimensional numerical simulations are carried out to investigate the hydraulic characteristics of the hori -zontal-axis tidal current turbine with speed-up tube .Effects of the dimension parameters of the speed-up tube , such as the length-diameter ratio and the area ratio , on the turbine's performance are also studied .Results show that the horizon-tal-axis tidal current turbine is of high energy utilization rate and great self-starting performance , while it is sensitive to the variation of the tidal current velocity .The speed-up tube can significantly improve the hydraulic performance , espe-cially the output power , of the tidal current turbine .The optimum length-diameter ratio of the speed-up tube is also de-termined .%采用数值模拟方法对一种带增速管的水平轴潮流水轮机的流量特性和转速特性进行了研究,并分析了增速管长径比、面积比对该水轮机水力性能的影响。计算结果表明:该潮流水轮机能量转换效率较高,同时自启动性能好,但对潮流流速变化较敏感;增速管可显著提高水轮机的水力性能,特别是输出功率;对于一定结构形式的潮流水轮机,增速管具有最佳的长径比。

  7. 零流电位法研究人血清白蛋白在金表面的吸附%Investigation of adsorption of human serum albumin on gold surface by zero current potentiometry

    Institute of Scientific and Technical Information of China (English)

    郑凤凤; 梁耀东; 陈莉英; 李华; 程忠洲

    2012-01-01

    Aim To investigate the adsorption behavior of human serum albumin (HSA) on the gold surface in pH 7.0 phosphate buffer solution. Methods A novel electrochemically approach, zero current potentiometry, was used. Results The adsorption of HSA on the gold surface resulted in the gradual shifts of the recorded 1-E curve and zero current potential Elcp along potential axis in negative direction. The plot of zero current potential Etxp a-gainst adsorption time t showed that the adsorption of HSA on the gold surface involved two steps, adsorption and conformation change of HSA. And the apparent rate constant kobs the adsorption obtained was (4. 0 ± 1. 8) × 10-3 s-1 Conclusion Using zero current potentiometry, the adsorption of HSA on the gold surface can be probed in situ and continuously, without the destruction of the formed adsorption layer.%目的 在pH7.0磷酸盐缓冲液中研究人血清白蛋白(HSA)在金表面的吸附行为.方法 采用零流电位法.结果 HSA在金表面吸附使记录的I-E曲线及其零流电位Ezcp沿着电位轴逐渐负移.零流电位Ezcp与吸附时间t的关系曲线表明,HSA在金表面吸附经历了吸附和HSA构象改变两个连续阶段,吸附的表观速率常数kobs为(4.0±1.8)×10-3 s-1.结论 用零流电位法可以原位连续跟踪HSA在金表面的吸附过程,而且不损伤HSA吸附层.

  8. Dual-frequency ferromagnetic resonance to measure spin current coupling in multilayers

    Science.gov (United States)

    Adur, Rohan; Du, Chunhui; Wang, Hailong; Manuilov, Sergei A.; Yang, Fengyuan; Hammel, P. Chris

    2014-08-01

    Spin pumping is a method for injecting a pure spin current into a non-magnetic metal (NM) by inducing precession of a neighboring ferromagnet (FM) at its ferromagnetic resonance frequency. A popular method to detect spin current uses the Inverse Spin Hall Effect (ISHE) to convert the spin current to a detectable charge current and hence a voltage. In order to better understand the role of time independent and high frequency contributions to spin pumping, we sought to detect we attempt to detect spin currents by using a second microwave frequency to detect changes in linewidth of a second ferromagnet due to the spin-torque induced by the spin current from the first ferromagnet. This dual resonance is achieved by pairing a custom broadband coplanar transmission line with the high-Q resonant cavity of a commercial electron paramagnetic resonance spectrometer. This technique is general enough that it should enable the investigation of spin currents in any FM-NM-FM system, for any orientation of external field, and is not sensitive to voltage artifacts often found in ISHE measurements. We find that the condition for simultaneous resonance generates a dc spin current that is too small to produce a measurable change in linewidth of the second ferromagnet, confirming the dominance of ac spin currents in linewidth enhancement measurements.

  9. Current Titles

    Energy Technology Data Exchange (ETDEWEB)

    Various

    2006-06-01

    This booklet is published for those interested in current research being conducted at the National Center for Electron Microscopy. The NCEM is a DOE-designated national user facility and is available at no charge to qualified researchers. Access is controlled by an external steering committee. Interested researchers may contact Jane Cavlina, Administrator, at 510/486-6036.

  10. 大学生完美主义现状调查及其对人格教育的启示%Investigation on Current Situation of Perfectionism of College Students and Its Implications for Personality Education

    Institute of Scientific and Technical Information of China (English)

    孙颖; 冯晨旭; 廖星

    2012-01-01

    本文运用大学生一般完美主义量表对大学生的完美主义现状进行调查,分析四种不同类型的大学生完美主义者的特点,提出当今人格教育应注意设定适当的目标和正确看待缺点两方面。%Using the college student perfectionism scale to investigate the current situation of college students perfectionism, this paper analyzes the characteristics of each four types of students, and draws the conclution that in personality education appropriate tandards and a correct view of disadvantages should be set.

  11. 勐腊农场橡胶林木资产管理及生产技术状况调查%Investigation Report on Assets Management and Current Technology of Hevea Rubber Tree in Mengla Farm

    Institute of Scientific and Technical Information of China (English)

    黄金; 王信超

    2013-01-01

    通过对云南勐腊县勐腊农场家庭承包经营改革前后橡胶林木资产管理及生产技术状况的调查,分析改革后存在的问题,提出完善农场改革的想法和建议。%Investigation on assets management and current technology of Hevea rubber tree before and after the reform of house-hold contract management was carried out in Mengla farm. Problems in process of reform are analyzed, and how to complete this reform in rubber farms is discussed too.

  12. Investigation of inter-grain critical current density in Bi2Sr2CaCu2O8+δ superconducting wires and its relationship with the heat treatment protocol

    Science.gov (United States)

    Pallecchi, I.; Leveratto, A.; Braccini, V.; Zunino, V.; Malagoli, A.

    2017-09-01

    In this work we investigate the effect of each different heat treatment stage in the fabrication of Bi2Sr2CaCu2O8+δ superconducting wires on intra-grain and inter-grain superconducting properties. We measure magnetic critical temperature T c values and transport critical current density J c at temperatures from 4 K to 40 K and in fields up to 7 T. From an analysis of the temperature dependence of the self-field critical current density J c(T) that takes into account weak link behavior and the proximity effect, we study grain boundary (GB) transparency to supercurrents; we also establish a relationship between GB oxygenation in the different steps of the fabrication process and GB transparency to supercurrents. We find that GB oxygenation starts in the first crystallization stage, but it becomes complete in the plateau at 836 °C and in slow cooling stages and is further enhanced in the prolonged post-annealing step. Such oxygenation makes GBs more conductive, thus improving the inter-grain J c value and temperature dependence. On the other hand, from inspection of the T c values in the framework of the phase diagram dome, we find that grains are already oxygenated in the crystallization step up to the optimal doping, while successive slow cooling and post-annealing treatments further enhance the degree of overdoping, especially if carried out in oxygen atmosphere rather than in air.

  13. Experimental Investigation for Dynamic Characteristics of the Active Magnetic Bearing Rotor System with Zero Bias Current%零偏置电流磁轴承转子系统动态性能的试验研究

    Institute of Scientific and Technical Information of China (English)

    谢振宇; 龙亚文; 徐欣

    2013-01-01

    建立5自由度磁悬浮轴承转子试验系统,分析有偏置和零偏置电流方式的工作原理,将5自由度零偏置电流方式应用于试验系统中,采用锤击法模态试验、基于频率响应函数的模型修正方法和系统高速旋转试验等方法研究该系统的动态性能,并与有偏置电流方式进行比较.研究结果表明,与有偏置电流方式相比,零偏置电流方式将导致控制参数的稳定区域、系统的模态阻尼以及磁轴承的刚度和阻尼明显减小,系统在各阶临界转速时的振幅较大,但系统仍然可以安全稳定越过第一阶弯曲临界转速.在实际应用中,合理的设计仍可保证零偏置电流磁悬浮轴承转子系统安全稳定运行,特别是在低速或载荷平稳等应用场合,零偏置电流方式能够使得系统具有较好的综合性能.%An experimental setup of five degree-of-freedom active magnetic bearing (AMB) rotor system is built up.The modes of bias current and zero bias current are presented.Dynamic characteristics of the system with zero bias current are investigated by stamping modal test,method of model updating based on frequency response function (FRF) and actual operation of the system,and compared with the results of the system with bias current.The results show that,for the system with zero bias current,the stability region of control parameters,modal damping and stiffness and damping of AMB are reduced obviously and its vibration amplitudes in motion on the critical speeds are larger than the system with bias current,however it can still get across the first bending critical speed safely.If the design of the system is proper,the mode of zero bias current can be adopted in actual application,especially in the application of low rotation speed and stable load,so that the system has better over-all properties.

  14. Infection Management and Health Practices Among Forensic Science Investigators in South Korea.

    Science.gov (United States)

    Cha, Kyeong-Sook; Cho, Ok-Hee; Yoo, Yang-Sook

    2015-05-01

    This study investigated the current status of infection management for forensic science investigators in South Korea. This study included 104 forensic science investigators, of which 97.1% were exposed to the blood or body fluids of corpses during handling. Of these investigators, 98% claimed they wore gloves, and 12.9% used double-layered gloves. A total of 70.6% of the participants with relevant work experience wore masks to reduce infection risk; 43% wore gowns and goggles when at risk of contracting an infection. Furthermore, 59.8% of the investigators with pertinent work experience sought appropriate first aid and treatment when they experienced contaminated skin cuts or stab wounds. Working conditions and other problems should be analyzed consistently with the cooperation of employees, occupational health practitioners, and relevant organizations to prevent work-associated infections among forensic science investigators.

  15. Investigation of abrupt degradation of drain current caused by under-gate crack in AlGaN/GaN high electron mobility transistors during high temperature operation stress

    Energy Technology Data Exchange (ETDEWEB)

    Zeng, Chang; Liao, XueYang; Li, RuGuan; Wang, YuanSheng; Chen, Yiqiang, E-mail: yiqiang-chen@hotmail.com; Su, Wei; Liu, Yuan; Wang, Li Wei; Lai, Ping; Huang, Yun; En, YunFei [Science and Technology on Reliability Physics and Application of Electronic Component Laboratory, The 5th Electronics Research Institute of the Ministry of Industry and Information Technology, 510610 Guangzhou (China)

    2015-09-28

    In this paper, we investigate the degradation mode and mechanism of AlGaN/GaN based high electron mobility transistors (HEMTs) during high temperature operation (HTO) stress. It demonstrates that there was abrupt degradation mode of drain current during HTO stress. The abrupt degradation is ascribed to the formation of crack under the gate which was the result of the brittle fracture of epilayer based on failure analysis. The origin of the mechanical damage under the gate is further investigated and discussed based on top-down scanning electron microscope, cross section transmission electron microscope and energy dispersive x-ray spectroscopy analysis, and stress simulation. Based on the coupled analysis of the failure physical feature and stress simulation considering the coefficient of thermal expansion (CTE) mismatch in different materials in gate metals/semiconductor system, the mechanical damage under the gate is related to mechanical stress induced by CTE mismatch in Au/Ti/Mo/GaN system and stress concentration caused by the localized structural damage at the drain side of the gate edge. These results indicate that mechanical stress induced by CTE mismatch of materials inside the device plays great important role on the reliability of AlGaN/GaN HEMTs during HTO stress.

  16. Current titles

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1995-07-01

    This booklet is published for those interested in current research being conducted at the National Center for Electron Microscopy. The NCEM is a DOE-designated national user facility and is available at no charge to qualified researchers. Access is controlled by an external steering committee. Interested researchers may contact Gretchen Hermes at (510) 486-5006 or address below for a User`s Guide. Copies of available papers can be ordered from: Theda Crawford National Center for Electron Microscopy, Lawrence Berkeley Laboratory, One Cyclotron Rd., MS72, Berkeley, California, USA 94720.

  17. Current ornithology

    CERN Document Server

    1983-01-01

    The appearance of the first volume of a projected series is the occasion for comment on scope, aims, and genesis of the work. The scope of Current Ornithology is all of the biology of birds. Ornithology, as a whole-organism science, is concerned with birds at every level of bi­ ological organization, from the molecular to the community, at least from the Jurassic to the present time, and over every scholarly discipline in which bird biology is done; to say this is merely to expand a dic­ tionary definition of "ornithology. " The aim of the work, to be realized over several volumes, is to present reviews or position statements con­ cerning the active fields of ornithological research. The reviews will be relatively short, and often will be done from the viewpoint of a readily­ identified group or school. Such a work could have come into being at any time within the past fifty years, but that Current Ornithology appears now is a result of events that are only seven to eight years old. One important event wa...

  18. Clinical comparison between a currently available single-loop and an investigational dual-channel endorectal receive coil for prostate magnetic resonance imaging: a feasibility study at 1.5 and 3 T.

    Science.gov (United States)

    Vos, Eline K; Sambandamurthy, Sriram; Kamel, Maged; McKenney, Robert; van Uden, Mark J; Hoeks, Caroline M A; Yakar, Derya; Scheenen, Tom W J; Fütterer, Jurgen J

    2014-01-01

    The objectives of this study were to test the feasibility of an investigational dual-channel next-generation endorectal coil (NG-ERC) in vivo, to quantitatively assess signal-to-noise ratio (SNR), and to get an impression of image quality compared with the current clinically available single-loop endorectal coil (ERC) for prostate magnetic resonance imaging at both 1.5 and 3 T. The study was approved by the institutional review board, and written informed consent was obtained from all patients. In total, 8 consecutive patients with prostate cancer underwent a local staging magnetic resonance examination with the successive use of both coils in 1 session (4 patients at 1.5 T and 4 other patients at 3 T). Quantitative comparison of both coils was performed for the apex, mid-gland and base levels at both field strengths by calculating SNR profiles in the axial plane on an imaginary line in the anteroposterior direction perpendicular to the coil surface. Two radiologists independently assessed the image quality of the T2-weighted and apparent diffusion coefficient maps calculated from diffusion-weighted imaging using a 5-point scale. Improvement of geometric distortion on diffusion-weighted imaging with the use of parallel imaging was explored. Statistical analysis included a paired Wilcoxon signed rank test for SNR and image quality evaluation as well as κ statistics for interobserver agreement. No adverse events were reported. The SNR was higher for the NG-ERC compared with the ERC up to a distance of approximately 40 mm from the surface of the coil at 1.5 T (P coils were comparable. Overall, T2-weighted image quality was considered better for NG-ERC at both field strengths. Quality of apparent diffusion coefficient maps with the use of parallel imaging was rated superior with the NG-ERC at 3 T. The investigational NG-ERC for prostate imaging outperforms the current clinically available ERC in terms of SNR and is feasible for continued development for future use as

  19. An Investigation on Current Physical Exercise Situation and Fitness Model of the Elderly in DDA%大连开发区老年人体育锻炼现状和健身模式的调查研究

    Institute of Scientific and Technical Information of China (English)

    付毅

    2013-01-01

    By means of documentary study, questionnaire and field investigation, this paper makes an inves-tigation on sports activities of the elderly in Dalian Development Area (DDA), and with it as a cut-in point, focusing on their motivation for sports, exercise forms, sports facilities, organization structure, sports intensity, etc., analyzing the current physical exercise situation and existing problems of the elderly, and coming up with four types of fitness models fit for the elderly: longevity-preservation and anti-aging, building up body, self-care ability, and sports competition and entertainment. The paper provides references for training the elderly to adopt a healthy lifestyle, guiding their appropriate physical exercise, promoting the healthy elderly sports science, and developing healthy urban aging-care.%本研究以大连开发区老年人参加体育活动为切入点进行实地调查,研究现阶段我区老年人参加体育活动的现状及存在的问题。采用文献资料法、问卷调查法、现场调查法,着重调查老年人参加体育活动的动机、运动项目、场地设施、运动强度等方面内容,并对影响老年人体育活动的因素进行综合分析,并提出适合老年人锻炼的健身模式,为培养老年人健康的生活方式,引导老年人科学锻炼,促进老年体育健康科学和我市健康老龄化的发展提供决策依据。

  20. 河南省林农技术需求现状调查与分析%Investigation and Analysis of the Current Situation of Self-employed Tree Cultivator Requirement in Henan Province

    Institute of Scientific and Technical Information of China (English)

    王文彬; 王团荣; 刘宁; 范定臣

    2012-01-01

    There are three strategies of technique requirements of production of forestry by self-employed tree cultivators: before, ongoing, and after production requirements. This article investigates and analyzes the current situation of tree cultivators' requirements for forestry techniques and the problems in the process of forestry production, by means of questionnaires, visiting the cultivators, and relevant topic seminars. Moreover, the article makes measurements and suggestions on how to accelerate and enlarge the popularization and application of forestry techniques.%林农对林业生产全过程的各种技术需求按大类分为产前、产中、产后需求。通过发放调查问卷、实地走访和专项座谈等形式对当前全省林农对林业技术需求现状和林业生产中存在的问题进行调查和分析,并就加快和扩大林业技术推广与应用提出了对策和建议。

  1. 潍坊市健身俱乐部私人教练现状调查与分析%The Investigation and Analysis of Personal Trainers' Current Situation of Weifang Health Clubs

    Institute of Scientific and Technical Information of China (English)

    韩雪

    2011-01-01

    Based on documentation, interviewing method, questionnaire survey and mathematical statistics, this paper investigates and analyses the current situation of personal trainers of weifang health clubs. The results show that, with the team getting younger and younger, personal trainers should increase the service consciousness and charismatic personality, and also they should improve their overall quality through the ability improvement of innovation, demonstration, theoretical analysis and social skills. How to strengthen the training of highly educated personnel and to norm the identification of personal trainers' certification are urgently to be solved.%采用文献资料法、访谈法、问卷调查法、数理统计法对潍坊市健身俱乐部私人教练的现状进行调查分析。结果表明,私人健身教练队伍具有年轻化趋势,应提高服务意识和个性魅力,通过完善创新能力、示范能力、理论分析能力和社交能力提高自身的综合素质。加强高学历健身人才的培养及规范私人健身教练资格认证是当前亟待解决的问题。

  2. 大学生余暇体育锻炼现状调查分析%Investigation and Analysis of Current Situation of Leisure Time Physical Training of College Students

    Institute of Scientific and Technical Information of China (English)

    樊云

    2015-01-01

    通过文献资料法、访谈调查法、问卷调查法、数理统计法等研究方法,从生活方式、健康状况、体育认知、锻炼时间等方面进行调查,了解大学生的余暇体育锻炼现状,结果表明:部分大学生喜好静态生活,对体育缺乏正确认知,场地器材缺乏,健康状况与投入体育锻炼的时间存在相关性。%With the methods of documentary information,consultation, questionnaire and mathematical statistics,the author take an investigation and analysis of current situation of physical training of college students from lifestyle, a health condition, sports cognitive, the time of exercise, etc. The results indicated that some college students have a static lifestyle, an incorrect perception about physical exercise. There is a lack of space equipment and there were correlated about health status and physical activity into time.

  3. 临床带教教师的职业倦怠感现状调查研究%An Investigation of Current Situation of Clinical Teachers' Job Burnout

    Institute of Scientific and Technical Information of China (English)

    林楠; 张新星; 郭楚敏; 彭成华

    2012-01-01

    This paper investigates the current situation of job burnout of clinical teachers who are a special group by using MBI —GS questionnaire and interviews. It shows that nearly 50% clinical teachers have strong feelings of job burnout. According to the analysis of reasons which lead to job burnout, it suggests that we should take positive psychological intervention and training system to reduce job burnout of clinical teachers effectively.%采用MBI-GS问卷和访谈形式,调查了解临床带教教师这一特殊群体的工作压力和职业倦怠现状,发现近50%的临床带教教师倦怠感较强,分析引起职业倦怠感的原因,建议采取积极的心理干预和培养机制,有效地降低临床带教教师的职业倦怠感.

  4. 长沙市英语培训机构发展现状的调查与分析%Investigation and Analysis on the Current Situation of the Development of English Training Institutions

    Institute of Scientific and Technical Information of China (English)

    胡澎

    2015-01-01

    随着社会的不断进步,英语培训产业在不断地壮大中,英语培训市场成为一种重要的文化产业。本文在从消费群体类型、培训机构培训定位、家长满意度和师资力量四个方面对长沙市英语培训市场进行调查的基础上,分析了目前英语培训机构存在的问题,以及提出一些英语培训市场发展的建议。%With continuous social progress, the industry of Eng-lish training is continuously prosperous, and English training has become an important cultural industry. From such four aspects as the types of consumption groups, the orientation of training insti-tutions, the degree of parents' satisfaction, and teaching staff, this paper investigates the market of English training in Changsha City, analyzes the problems existing in the current English train-ing institutions, and proposes some suggestions for their develop-ment.

  5. Organic Complexation of Dissolved Copper and Iron from Shipboard Incubations in the Central California Current System: Investigating the Impacts of Light Conditions and Phytoplankton Growth on Iron- and Copper-Binding Ligand Characteristics

    Science.gov (United States)

    Mellett, T.; Parker, C.; Brown, M.; Coale, T.; Duckham, C.; Chappell, D.; Maldonado, M. T.; Bruland, K. W.; Buck, K. N.

    2016-02-01

    Two shipboard incubation experiments were carried out in July of 2014 to investigate potential sources and sinks of iron- and copper-binding organic ligands in the surface ocean. Seawater for the experiments was collected from the central California Current System (cCCS) and incubated under varying light conditions and in the presence and absence of natural phytoplankton communities. Incubation treatments were sampled over a period of up to 3 days for measurements of total dissolved copper and iron, and for the concentration and conditional stability constants of copper- and iron-binding organic ligands. Dissolved copper and iron were determined by inductively coupled plasma-mass spectrometry (ICP-MS) following preconcentration on a Nobias PA1 resin. Organic ligand characteristics for iron and copper were determined using a method of competitive ligand exchange-absorptive cathodic stripping voltammetry (CLE-ACSV) with the added competing ligand salicylaldoxime. Trends in ligand concentrations and conditional stability constants across the different treatments and over the course of the incubation experiments will be presented.

  6. Current investigations into the genotoxicity of zinc oxide and silica nanoparticles in mammalian models in vitro and in vivo: carcinogenic/genotoxic potential, relevant mechanisms and biomarkers, artifacts, and limitations

    Directory of Open Access Journals (Sweden)

    Kwon JY

    2014-12-01

    Full Text Available Jee Young Kwon,1,* Preeyaporn Koedrith,2,* Young Rok Seo1 1Department of Life Science, Institute of Environmental Medicine, Dongguk University, Seoul, Republic of Korea; 2Faculty of Environment and Resource Studies, Mahidol University, Phuttamonthon District, NakhonPathom, Thailand *These authors contributed equally to this work and should be considered as co-first authors Abstract: Engineered nanoparticles (NPs are widely used in many sectors, such as food, medicine, military, and sport, but their unique characteristics may cause deleterious health effects. Close attention is being paid to metal NP genotoxicity; however, NP genotoxic/carcinogenic effects and the underlying mechanisms remain to be elucidated. In this review, we address some metal and metal oxide NPs of interest and current genotoxicity tests in vitro and in vivo. Metal NPs can cause DNA damage such as chromosomal aberrations, DNA strand breaks, oxidative DNA damage, and mutations. We also discuss several parameters that may affect genotoxic response, including physicochemical properties, widely used assays/end point tests, and experimental conditions. Although potential biomarkers of nanogenotoxicity or carcinogenicity are suggested, inconsistent findings in the literature render results inconclusive due to a variety of factors. Advantages and limitations related to different methods for investigating genotoxicity are described, and future directions and recommendations for better understanding genotoxic potential are addressed. Keywords: carcinogenicity, exposure assessment, genotoxicity, nanoparticles, risk evaluation

  7. Investigation of the current situation of the breast self-examination of the rural women in a village in Jiading District%嘉定区某村妇女乳房自查现状调查

    Institute of Scientific and Technical Information of China (English)

    程丽萍

    2014-01-01

    目的:调查联华村农村妇女性乳房自我检查现状。方法:自行设计问卷,调查20~74岁501名农村妇女。结果:38.12%的妇女做过乳房自查,其中9.98%的妇女能做到每月自查。不做乳房检查的主要原因是不知道怎么做和不知道需要做。结论:联华村农村妇女乳房自查意识较低,需加强健康教育。%Objective:To investigate the current situation of the breast self-examination of the rural women in Lianhua Village. Methods:The questionnaire was self-designed to survey 501 rural women aged from 20 to 74 years old. Results:38.12%of the women did the breast self-examination, of whom only 9.98%of them could do it monthly. The main reason for not doing the breast examination was that they didn’t know how to do and what needs to be done. Conclusion:The awareness of the breast self-examination of the women in Luanhua Village is low and the health education needs to be strengthened.

  8. An Investigation and Analysis on the Current Psychological Problems of the Employment of the Agriculture-Related Undergraduates%农科类大学生就业心理问题现状调查与分析

    Institute of Scientific and Technical Information of China (English)

    刘晶; 张素芬; 李婵

    2014-01-01

    Abstract Through the investigation and analysis on the current psychological problems and the psychological tendency of the employment of the agriculture-related undergraduates, we proposed improving construction of aiding system through helping the agriculture-related undergraduates perfect themselves, school reform, the connection with graduate family and the talent market, strengthening the construction of social practice base and graduation practice base. The purpose is offering powerful support for further employment of agriculture-related undergraduates.%通过问卷调查,重点分析了农科类大学生就业心理问题现状和心理趋向,提出从帮助农科类毕业生完善自身,力推学校改革,紧密联系家庭和人才市场,加强社会实践基地和毕业实习基地建设等各方面构建完善的就业帮扶体系,为进一步促进农科类大学生就业提供强有力的支撑。

  9. An Investigation of and Countermeasure to the Current Religious Activitiesby People in Tianjin%天津民间宗教现实活动调查与对策研究

    Institute of Scientific and Technical Information of China (English)

    濮文起

    2011-01-01

    anthropology in the empirical investigation of these activities in Tianjin. Within about one year, the writer visited eight villages and towns in the districts of Nankai, Jinnan, Beichen, Xiqing, Dongli, and Dagang, as well as in the county of Jinghai and Jixian, where the religious activities were rather popular, investigating nearly 100 people of all ages and both sexes, holding over ten seminars, and participating and observing various religious activities. To investigate the interrelation between the activities in Tianjin and those in other places, the writer also went to Cangxian County, Pingxiang County in Hebei and Huimin County, Zhangqiu County in Shandong to investigate the popular religious activities there. During the investigation, the writer used the method for sociology and gave out 200 questionnaires. Meanwhile, the theory and method of religious history were applied to trace back to the popular religion in Tianjin history for a brief retrospective. Based on this, the history and current status of popular religion in Tianjin and the features of the activities were analyzed and studied, and some advice on how to understand correctly and how to handle the problem of current popular religious activities in Tianjin properly have been put forward.

  10. Investigation and Analysis on the Current Situation of Provincial University Digital Library Consortia in China%我国省域高校数字图书馆联盟建设现状调查与分析

    Institute of Scientific and Technical Information of China (English)

    马志杰

    2012-01-01

    通过对我国14个省域高校数字图书馆联盟现状的调查发现,目前存在联盟总量和新建联盟数量较少,自动化集成管理系统不统一,共享效果不佳,服务水平不高,利益分配不均,缺乏利益平衡机制等问题。省域高校数字图书馆联盟的发展应采取以下策略:从多渠道筹集经费,加强对不发达地区的支持力度,争取政府的大力支持,采用统一的自动化管理系统,加强特色数据库的建设和共享,建立利益平衡机制。%Through the investigation into the current situation of the provincial university digital library consortia in China, we could find out that the quantum of consortia and the number of new consortia is less, the automatic integrated management system is not unified, the sharing effect is ineffective, the level of services is not high, the distribution of benefits is uneven, lacking of interest balance mechanisms, and so on. For solving these problems, the provincial university digital library consortia should put forward some strategies for its development from such aspects as obtaining financial supports through various channels, strengthening supports to underdeveloped areas, striving for strong government supports, applying the unified automatic management system, strengthening the construction and sharing of characteristic databases, and establishing the interest balance mechanism.

  11. Investigation and analysis of the current state of career women in Henan province participating in leisure sports%河南省职业女性参与休闲体育的现状调查分析

    Institute of Scientific and Technical Information of China (English)

    房淑珍; 金洪亮; 杨国顺; 郭玉江

    2009-01-01

    By means of questionnaire survey the authors investigated the current state of 927 career women in 9 cit- ies in Henan province participating in leisure sports, and revealed the following findings: the leisure life styles of career women are kind ofundiversified, mainly static "seeing movies" and "reading books", and very few sports ac- tivities; most leisure sports participated in by career women are athletic activities, and the percentages of athletic ac- tivity participation by management personnel, technical professionals and office staff are relative higher; career women participated in athletic activities mainly in free public playgrounds; sports activities engaged in by career women are kind of undiversified, but the sports events show a trend and space for increasing.%采用问卷调查对河南省9地市927名职业女性参与休闲体育的现状进行调研,结果显示:职业女性的休闲生活方式比较单一,主要是以静态为主的"看电影电视"和"读书",体育运动很少;职业女性参与休闲体育时,以运动性活动为最多,其中管理层、专业技术人员、办事人员参与运动性活动的比例较高;职业女性主要在免费的公共活动场所参与运动性活动;职业女性从事的运动性活动还比较单一,但活动项目有增加的趋势和空间.

  12. 老年群体体育锻炼现状调查分析——以杭州市为例%An Investigation of the Current Situation of Physical Exercise of the Old People

    Institute of Scientific and Technical Information of China (English)

    杨榕斌

    2012-01-01

    Physical exercise of the elderly is of great significance for promoting healthy living of the old, and the sound development of the whole society. On the basis of a worldwide comprehensive analysis of the existing researches about physical exercise of aged people, we do a case study of Hangzhou. The study attempt to investigate the current situa- tion of physical exercise of old people in Hangzhou, by using questionnaire survey and interviewing method, etc.. Af- ter the systematic statistical analysis, we try to find those unsatisfied demands of the old people in physical exercise, and propose some relevant suggestions, and finally provide certain empirical information for the future studies of eld- erly physical exercise.%老年群体体育锻炼是对于促进老年群体自身健康生活以及社会的良性发展具有重要意义。研究试图在综合分析国内外老年群体体育锻炼问题的相关研究基础上,结合我国老年群体的特点及老年人锻炼现状,运用问卷调查、重点访谈等社会科学研究方法,以杭州市为个案,对老年人口体育锻炼的状况进行了全面、系统的分析,以期全面合理地掌握老年群体体育锻炼的情况,合理分析其需求原因问题并提出一些对策建议,为未来老年群体体育锻炼的研究提供一定的资料基础。

  13. 齐齐哈尔市精神卫生防治体系现状调查与对策研究%Investigation on current situation and countermeasures of mental health prevention system in Qiqihar

    Institute of Scientific and Technical Information of China (English)

    张丽宏; 周秋雅; 王文翔; 李平; 周馨竹; 齐金玲; 于增艳; 曹运华

    2015-01-01

    Objective To investigate and study current situation of mental health prevention system in Qiqihar, and analyze the existing problems and study the countermeasures .Methods Literature review, expert interview and questionnaire were used .Results There were mainly 5 psychiatric hospitals ( department ) in Qiqihar, 1,310 preparation beds and 688 preparation staffing, including 553 health technical personnel , 20 other technical personnel , 29 managers and 86 workers.Professionals have low academic education and titles .Most mental hospitals are in the way of closed management and at the preliminary stage of development .Conclusions Mental health prevention system in Qiqihar takes shape , but lacks human resources , basic technical equipment is hard to meet the work needs and still lack control efforts .%目的:调查了解齐齐哈尔市精神卫生防治体系现状,分析存在的问题并进行对策探讨。方法采用文献法、访谈法和问卷调查法。结果齐齐哈尔市主要有5所精神病院(科),编制床位1310张,编制人员688人,其中卫生技术人员553人,其他技术人员20人,管理人员29人,工勤人员86人,专业人员学历、职称偏低;精神病院多以封闭式管理为主,基本处在初步发展阶段。结论齐齐哈尔市精神卫生防治体系初具规模,但人力资源不足,基础技术设备难以满足工作需要,防治力度还有所欠缺。

  14. Investigation for Current Situation of College Students’ Environmental Awareness and Strategies for Environment Education%高校学生环境意识现状调查与环境教育对策

    Institute of Scientific and Technical Information of China (English)

    杜卫红; 王振龙

    2015-01-01

    The environment education is an effective method to achieve strategy of sustainable development and build the socialist cultural power.Colleges and universities take on the historical responsibility of training high-quality talents for our country, offering environ-mental education curriculum is good for college students to understand the relation of resources, development and environment, establish environmental values, improve environmental literacy effectively, strengthen social responsibility of environmental protection, and create a beautiful China collectively.This paper takes Hulunbuir College as an example, investigates the environmental awareness of college students, analyzes the current situation and deficiency of environmental education, puts forward the corresponding measures and provides a reference for the environmental education in Colleges and universities.%环境教育是实现可持续发展战略和建设社会主义文化强国的有效手段。高等院校担负着为国家培养高素质人才的重任,开设环境教育课程有利于大学生正确认识资源、发展与环境的关系,树立环境价值观,增强环境保护的社会责任感,共创美丽中国。本文以呼伦贝尔学院为例,调查大学生的环境意识状况,分析环境教育的现状与不足,并提出相应的措施,为高校环境教育提供参考。

  15. 慢性阻塞性肺疾病患者呼吸功能锻炼现状调查%Investigation on current situation of respiratory rehabilitation exercise in patients of chronic obstructive pulmonary disease

    Institute of Scientific and Technical Information of China (English)

    刘纳; 韩春燕; 孙玉梅

    2010-01-01

    Objective To survey the current situation of respiratory rehabilitation exercise (RRE) in patients of chronic obstructive pulmonary disease(COPD), to identify and find the reasons of poor adherence of respiratory function exercise and provide the evidence for RRE. Methods A total of 84 patients of COPD were investigated using a questionnaires concerned about RRE and possible influencing factors. Results In 84 patients, 28(33.3%) nerve heard RRE, 25(29.8%) heard but not fully understood, 31 (36.9%) fully understood. 59 (70. 2% ) nerve exercised, 9 ( 10. 7% ) given up, 10 ( 11.9% ) occasionally exercised, 6(7.1%) insistently exercised. According to linear regression, the understanding of RRE, understanding of the necessity of RRE, and implementation of RRE were correlated with education and self-efficacy of the patient (P <0. 01 ). Conclusions Current situation of RRE in COPD patient is dissatisfied. Nursing staff should strengthen the propaganda, improve the relevant knowledge of respiratory function and exercise adherence,achieve true delaying disease development and improve their quality of life.%目的 了解慢性阻塞性肺疾病(COPD)患者呼吸功能锻炼的现状,以找出和发现呼吸功能锻炼依从性差的原因,为开展呼吸功能锻炼和护理提供依据.方法 采用问卷调查法对84例COPD患者进行呼吸功能锻炼的情况及可能的影响因素进行了调查.结果 84例COPD患者中,没听说过呼吸功能锻炼者28例,听说过但不清楚者25例,知道者31例;从未做过者59例,开始做后来不做者9例,偶尔做者10例,一直坚持做者6例.直线相关分析显示,患者对呼吸功能锻炼的了解程度、必要性认识及实施程度与其文化程度及自我效能呈正相关关系(P<0.01).结论 COPD患者进行呼吸功能锻炼的现状是不容乐观,护理人员应加强相关知识的宣教,提高患者对呼吸功能锻炼的认识及依从性,真正达到延缓疾病发展,提高患者生活质量的目的 .

  16. Investigation on current situation of critical thinking skills among students in a provincial medical college%某省属医学院学生批判性思维能力现况调查

    Institute of Scientific and Technical Information of China (English)

    陈金; 邓波; 潘池梅; 刘振中; 周政华

    2016-01-01

    Objective To analyze the current situation of critical thinking skills among students in a provincial medical college. Methods The cluster sampling method and the Chinese version of Critical Thinking Ability Scale (CTDI-CV)were adopted to investigate the current situation of critical thinking skills among various specialties of students in a medical college. Results A total of 1400 questionnaires were issued. Totally 1253 valid questionnaires were recovered ,the CTDI-CV total score of medical students was(266.8±27.8) points(lower than 289.0 points),32.2%(403/1253) of medical students showed the posi-tive critical thinking skills. The 2-dimension scores of the systematic ability and confidence in male students were higher than those in female students,while the 4-dimension scores of open mind,analytical ability,intellectual curiosity and cognitive maturi-ty in female students were higher than those in male students,and the differences were statistically significant(P<0.05). Conclu-sion The critical thinking skills among students in a provincial medical college is lower ,therefore multi-aspect comprehensive measures should be taken to cultivate students′critical thinking skills.%目的:分析某省属医学院学生批判性思维能力现状。方法采用整群抽样法用中文版批判性思维能力测量表(CTDI-CV)调查某省属医学院各专业本、专科学生批判性思维能力现状。结果共发放问卷1400份,回收有效问卷1253份,医学生CTDI-CV总分为(266.8±27.8)分(低于280.0分),32.2%(403/1253)医学生表现为正性批判性思维能力。男生在系统化能力和自信心2个维度得分高于女生,女生在开放思想、分析能力、求知欲和认知成熟度4个维度得分均高于男生,差异均有统计学意义(P<0.05)。结论某省属医学院学生批判性思维能力总体水平较低,应采取多方面综合措施培养学生的批判性思维能力。

  17. Investigation and analysis of current situation of diabetics management in Chongqing*%重庆市糖尿病患者管理现状的调查与分析

    Institute of Scientific and Technical Information of China (English)

    刘智平; 昝利萍; 刘秀容; 童立纺; 郭伟; 滕小春; 李启富

    2012-01-01

    目的 了解重庆市糖尿病管理及其并发症的现状.方法 随机抽取300例病程1年以上的糖尿病患者,通过访谈、回顾病历,填写调查表进行调查.调查内容包括人口学基本信息、糖尿病相关并发症、接受糖尿病健康教育情况、糖尿病自我管理情况、糖尿病患者对治疗方案的遵循情况等.结果 300例患者中均不同程度合并相关并发症;使用口服降糖药的患者占65.00%;84.33%患者接受过不同形式的健康教育,患者参与糖尿病知识培训、饮食指导的比例分别为88.50%和93.30%;患者的糖尿病知识主要通过医务人员获得;坚持定期检查的患者占53.70%,17.50%的患者糖化血红蛋白达标.结论 重庆市糖尿病患者管理现状与2007年中国糖尿病防治指南中规定的控制目标存在较大差距.%Objective To understand the current situation of management of diabetes mellitus and its complications in Chongqing. Methods 300 cases of diabetes mellitus with duration of more than one year were collected randomly. Basic demographic information, diabetes-related complications, health education associated with diabetes, diabetes self-management and the compliance to therapeutic regimen of diabetics were investigated through interview,medical record review and questionnaire survey. Results 300 patients all suffered from diabetes-related complications in varying degrees. Patients who accepted oral hypoglycemic agents accounted for 65. 00%. 84. 33% of patients received different forms of health education,and the proportions of patients participated in diabetic knowledge training and dietary gruidance were 88. 50% and 93. 30% respectively. Patients obtained diabetes knowledge mainly through medical staff. Patients insisted on regular test accounted for 53. 70% ,and 17. 50% of patients meet the glycosylated hemoglobin goal. Conclusion A large gap exits between current situation of diabetes management in Chongqing and the control target

  18. 上海社区内更年期妇女焦虑现况调查%Investigation on the current situation of anxiety in perimenopausal women in communities of Shanghai

    Institute of Scientific and Technical Information of China (English)

    顾磊; 杜莉; 施红; 钱晓敏; 谭晶; 秦敏; 纪若思; 沈谦; 朱丽萍

    2012-01-01

    目的:探讨上海市部分城区更年期妇女焦虑症状发生现况及其影响因素.方法:采用一般情况调查表.改良更年期Kupperman评分量表、社会支持评定量表、广泛性焦虑障碍量表,于2010年12月~2011年2月在上海某社区内对935名参加普查的45 ~59岁妇女进行调查.结果:焦虑症状呈现率14.1%.与焦虑症状发生有关的影响因素包括:户籍、1年内子女升学或就业失败、头痛、心悸、皮肤蚁走感、更年期综合征、主观支持评分等.结论:上海市更年期妇女焦虑症状呈现率较高,与多种社会、心理、生物学因素有关.医务工作者需采取有效措施完善更年期心理保健.%Objective; To explore the current situation and effect factors of anxiety among perimenopausal women in partia: urban areas in Shanghai. Methods: General condition questionnaire, modified menopausal Kupperman assessment scale, social support rating scale (SSRS), and generalized anxiety disorder 7 -item scale (GAD -7) were used to survey 935 women aged 45 ~59 years old who received general investigation in a community in Shanghai from December 2010 to February 2011. Results: The incidence of anxiety was 14.1%. The effect factors of anxiety in perimenopausal women included census registration, entering a higher school or employment failure of their children within one year, headache, palpitation, skin formication, menopausal syndrome, and subjective support score, and so on. Conciusion: The incidence of anxiety among perimenopausal women is high. It is associated with a variety of social, psychological and biological factors. The medical workers should take effective measures to perfect menopausal mental health.

  19. Investigation and Anlaysis of Current Situation of Green Logistics Development in South Jiangsu%苏南地区绿色物流发展现状调研分析

    Institute of Scientific and Technical Information of China (English)

    尹新

    2012-01-01

    In this paper, we investigated the structure of employees of logistics enterprises in the south Jiangsu region as well as the degree to which they understood green logistics. The index used to measure the level of green logistics development included ratio of total logistics cost to GDP, the greatest obstacles and factors influencing the development of green logistics and the current method for self-evaluation of green logistics development of the logistics enterprises in this region. The result showed that the development of the logistics industry in south Jiangsu region still led that of the Jiangsu province as a whole or even the whole nation and the development of green logistics there also was above the national average level, which was yet still lagging behind that of the developed countries. At the end, we proposed the corresponding measures to reinforce the cultivation of logistics talents, to implement the marketing strategy in the green logistics environment, and to integrated transportation resources and reduce logistics cost, etc.%通过问卷调研、实地走访及文献调研法,调研苏南地区物流企业从业人员的结构和对绿色物流的理解程度,调研衡量绿色物流发展水平的指标:物流总成本与GDP的比值、调研影响苏南地区绿色物流发展的最大障碍和因素、调研苏南地区物流企业现有评价方式.结果表明:苏南地区物流业发展处于江苏省乃至全国领先水平,绿色物流的发展高于全国平均水平,与国外先进国家仍有差距.通过采取加强物流人才培养及实施绿色物流下营销策略、整合交通运输资源及降低物流成本、优化苏南地区物流企业评价体系及企业类型等相应措施,进一步发展苏南地区绿色物流.

  20. Investigate on current situation of puerperium health care of women from a village of He'nan province%河南省某村妇女产褥期保健现状调查

    Institute of Scientific and Technical Information of China (English)

    伍东红; 渠利霞; 楚银萍; 高金玲; 潘雪

    2013-01-01

    Objective: To understand the current situation of puerperium health care of women from a village of He'nan province. Methods: Questionnaire investigation and individual interview were adopted to survey 57 mothers whose infants ≤2 years in a village of He'nan province. Results: Fifty - one puerperium women didn't eat fruits (89. 5% ) , 36 puerperium women didn't eat vegetables (63. 2% ) , 49 puerperium women didn't wash hair (86. 0% ) , 49 puerperium women didn't go out (89. 0% ) , 50 puerperium women stayed in a airproof environment (87. 7% ) . The educational levels of parturient women was one of influencing factors of self - health attitude. Conclusion: Misunderstandings exist in self-health of rural women during puerperium period, such as unreasonable dietary structure, bad health status, and less exercises; rural medical health care service is not widespread, maternal and child health care knowledge should be popularized to rural area according to specific circumstance to improve maternal - infantile health level.%目的:了解河南省某村妇女产褥期保健现状.方法:运用问卷调查和个别访谈法对河南省某村57名≤2岁婴幼儿的母亲进行调查.结果:产褥期妇女不吃水果51人,占89.5%;不吃蔬菜36人,占63.2%;不洗发49人,占86.0%;不外出活动49人,占89.0%;不通风50人,占87.7%.产妇的文化程度是自我保健态度的影响因素.结论:农村妇女产褥期自我保健存在误区,饮食结构欠合理、卫生状况欠佳、运动较少.农村医疗卫生保健服务尚未普及,应视具体情况,向农村普及妇幼保健知识,提高母婴健康水平.

  1. An Investigation of the Current National Relationship of University Students in Xinjiang%新疆高校大学生民族关系现状调查∗

    Institute of Scientific and Technical Information of China (English)

    李进; 吴琼

    2014-01-01

    文章在调查统计的基础上,通过民汉对比、男女对比和文理科学生对比,在民族交往意愿、对待民族间通婚态度、不同民族学生间信任关系以及维护民族关系的行为等几个方面对新疆高校大学生的民族关系现状进行了分析。数据显示,当前新疆高校民族关系总体较为乐观,然而在交往意愿、对待通婚的态度等方面存在着较为明显的类差异。我们要根据不同民族、不同性别、不同学科学生的特点,通过多途径、多方式将民族团结的理念渗透到各类教育之中,以形成高校团结友爱的共同体价值。%This paper, on the basis of the investigation data, analyzed the current ethnic relations of the university students in Xinjiang in terms of the comparisons between the Han Chinese and ethnic minority Chinese, male and female, and liberal arts and science students, and in terms of issues such as communication will between ethnic groups, attitudes toward inter-ethnic marriage, trust relationship between students and acts of maintaining ethnic relations. It found that an optimistic attitude toward ethnic relations was gener-ally held in Xinjiang universities, whereas communication will and attitudes towards inter-ethnic marriage presented evident differences. It is proposed that ethnic unity concepts be instilled into all kinds of education to form the common value of unity and friendship among university students by means of varying channels and modes in light of ethnic group, gender, and disciplines.

  2. Investigation and analysis of current stress status of nurses and countermeasures%护士工作压力现状的调查分析及应对措施

    Institute of Scientific and Technical Information of China (English)

    史德焕; 赵静; 刘晓燕

    2011-01-01

    目的 对护士工作压力现状进行调查研究,探求缓解护士工作压力的有效措施.方法 在文献研究的基础上采用访谈与问卷调查相结合的方法对齐鲁医院199名护士进行调查,了解护士工作压力现状并制订应对措施.结果 74.4%的护士承受较高甚至是非常高的工作压力并且在福利待遇、晋升以及工作量与时间分配上3个条目的压力感受最强烈,不同年龄、职称、学历、科室的护士对工作压力的感受有所不同,有49.7%的护士处在较高的工作倦怠状态下.结论 护士工作压力与工作倦怠现象严重,应当从环境层面、组织层面、个人层面对护士的工作压力进行疏导与管理.%Objective To research the current stress status and job stressors of the nurses,and explore the measures of relieving stress.Methods Investigation was carried out in 199 nurses of Qilu hospital by using interviewing and surveying method basing on the literature research.Results 74.4% nurses work under high even very high stress.Benefit,promotion,workload and time allocation were the first three stressors.Ages,professional titles,education degree,departments were influential factors of stress.49.7% of the nurses were under high job burnout.Conclusions The nurses are under high work stress and job burnout.There should be measures from environmental level,organizational level,individual level to relieve and manage the stress.

  3. 儿科护士护理软技能现状调查与影响因素分析%The current situation investigation and influence factors analysis of pediatric nurses nursing soft skills

    Institute of Scientific and Technical Information of China (English)

    喻婷; 郑显兰; 李平; 崔璀; 郭俊俊

    2016-01-01

    目的::了解我院护士护理软技能现状,分析其影响因素,为护士分层次培训提供依据。方法:采用问卷调查法,应用护理软技能测评系统对我院936名在岗护理人员进行调查。结果:我院护士软技能总分为(54.47±9.70)分,处于一般水平。不同年龄段护士的组织管理技能、自我管理技能差异有统计学意义( P<0.05);不同工作年限护士的组织管理技能、职业情操、认知技能差异有统计学意义( P<0.05);不同职称护士的软技能总分、组织管理技能、自我管理技能、认知技能差异有统计学意义(P<0.05);不同学历护士的软技能总分、组织管理技能、职业情操、认知技能差异有统计学意义(P<0.05)。结论:临床护理中软技能服务相对薄弱,护理管理者应根据护士的具体情况有针对性的加强护理软技能培养,构建护士护理软技能培训内容体系,并针对性地进行培训,以提高护理品质。%Objective:To know the current situation of nursing soft skills of nurses in our hospital, analyze the influence factors and provide evidence for nur-ses training at different levels. Methods:Adopted questionnaires investigation method and investigated 936 sitting nurses in our hospital by applying nursing soft skills testing system. Results:The total scores of nurses soft skills in our hospital was (54.47 ±9.70), which was at general level. The difference of or-ganization and management skills as well as self-management skills of nurses in different ages was of statistic significance (P<0. 05);the difference of or-ganization and management skills, occupation sentiment and cognitive skills of nurses in different working life was of statistic significance (P<0. 05);the difference of soft skills total score, organization and management skills, self-management skills and cognitive skills of nurses in different professional titles was of statistic significance (P

  4. Moored current meter data collected from the Bering Sea in support of the Fisheries Oceanography Cooperative Investigations (FOCI) project from 12 September 1995 to 16 September 1996 (NODC Accession 0000674)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Moored current meter data were collected from the Bering Sea from September 12, 1995 to September 16, 1996. Data were collected by the Pacific Marine Environmental...

  5. 上海邮政电信移动通信系统在职职工吸烟现状调查%Investigation of current situation of smoking of employees working in Shanghai postal telecom mobile communication system

    Institute of Scientific and Technical Information of China (English)

    姚箴毅; 隆玄; 吴晓丹; 李善群; 陈红

    2012-01-01

    Objective To provide clinical data and basis for formulating tobacco-control measures targetedly by the analysis of smoking behavior and characteristics of employees working in Shanghai postal telecom mobile communication system (SPTMCS).Methods The smoking behavior of 8 389 employees working in SPTMCS was investigated with questionnaire.The indices of smoking pattern included general smoking rate,current smoking rate,heavy smoking rate,quitting smoking rate,relapse rate,initiatively quitting smoking rate,passive smoking rate,passive smoking rate in work places and families.Results The general smoking rate was 35.81%,with males (57.09%) higher than females (0.48%).The rates of current smoking and heavy smoking were 34.47% and 17.02%,respectively.The rates of general smoking,current smoking,and heavy smoking increased gradually with the growth of the age,and were highest in the postal department.The rates of quitting smoking,relapse,passive smoking,passive smoking in work places and families were 7.32%,3.63%,61.82%,44.42%,and 29.96%.Conclusions The general smoking rate of employees working in SPTMCS is still high,with males higher than females and highest in the postal department,and increases gradually with the growth of the age.The quitting smoking rate is not high but with a high relapse rate.So we should speed up the implementation and perfection of the tobacco-control measures in work places,and strengthen the efforts and expand the scope to control tobacco smoking to build a nice smoke-free environment for more people away from tobacco.%目的 通过分析上海邮政电信移动通信系统(上海邮电系统)职工的吸烟行为和特点,为本领域制定针对性的控烟措施提供临床资料和依据.方法 对8389名上海邮政电信移动通信系统在职职工进行吸烟行为问卷调查,对吸烟率、现在吸烟率、重度吸烟率、戒烟率、复吸率、意愿戒烟率、被动吸烟率、工作场所被动吸烟率

  6. The Current Situation Investigation of Health Statistics and Informationalized Practitioners of Jilin Province in 2014%2014年吉林省卫生统计和信息化从业人员现状调查

    Institute of Scientific and Technical Information of China (English)

    王秋艳; 刘婷; 张启军; 李兵; 骆凝

    2015-01-01

    目的:了解吉林省统计信息化从业人员现状,探查现有人员配置的缺陷,为建立卫生统计信息化从业人员业务培训的长效机制提供有力依据。方法采用普查方式对吉林省69家县(区)级以上卫生行政部门、232家二级及以上医院中全部从事卫生统计信息化工作的人员进行调查,用Excel2003数据汇总,SPSS13.0统计软件进行统计分析。结果全省独立统计信息机构数量较少;统计信息化从业人员以30~40岁为主,占总体40.2%,本专科学历占90%以上,所学专业较为分散,职称方面无职称者占39.3%,职业医师占医师职称的70.9%,75.4%人员为科员职务,69.3%人员在编,57.7%从事统计工作人员为兼职,62.6%从事信息化工作人员为专职,从业人员相关资格证书取得情况有待加强。结论卫生统计与信息化机构设置不足,卫生统计与信息化工作人员整体素质不高、从业状况有待完善。应推进卫生统计信息机构体制改革,加大培养力度,提高人员素质,规范信息管理,促进资源共享。%sObjectives To acquaint the current situation of statistics and information practitioners in Jilin Province, explore the defects of current personnel configuration, and provide a strong basis of long-term mechanism for those who establish health statistics and information practitioners training as well.Methods To investigate the staff working in the 69 county level health administrative department or in the 232 secondary hospitals who are engaged in the work of health statistics information with the method of general investigation, and complete a statistics summary by means of the Excel2003,besides,using SPSS13.0 statistical software for statistical analysis.Results The number of independent statistical information institutions in the province is less. statistical information practitioners are 30-40 years old, accounting for 40.2% of the total. The

  7. Current Research Activities.

    Science.gov (United States)

    1975-02-01

    Biological oceanography, marine food chain dynamics, carbon cycling in the ocean. Martin, Seelye,Ph.D., Johns Hopkins. Geophysical fluid dynamics...currently under investigation, (Ahmed, Packard) 8. Amylase studies An assay for amylase activity has been adapted to measure zooplankton grazing. This...as a function of available food and of the biomass of copepods, was prescribed by sixteen equations: five, corresponding to copepodite stages (I to V

  8. Investigation on the current status of students' critical thinking ability and communication ability of college nursing students%大专护生评判性思维能力及人际沟通能力的现状调查

    Institute of Scientific and Technical Information of China (English)

    段艮芳; 何海艳; 王连艳; 陈向阳; 吴学华; 何燕

    2015-01-01

    Objective To investigate the current status of critical thinking ability and commu-nication ability of nursing students, therefore providing reference for teaching reform. Methods The Critical Thinking Scale translated and revised by Pro. Peng MeiZi of Hong Kong Polytechnic University, and Supportive Communication Scale (SCS) edited by Whetten and his colleague were used to investi-gate nursing students' levels of critical thinking and communication ability among 176 selected nursing students in our college, with method of Random Cluster Sampling. Descriptive analysis, single sample t-test, and two independent sample t-test were applied to the collected data with SPSS l7.0. Results①The average score of critical thinking for the investigated college nursing students was (264.54± 29.94). 72.73% of them got 210~280 points, in which three items: cognitive maturity (t=4.695, P=0.000), open mind (t=4.016, P=0.000), and intellectual curiosity (t=2.973, P=0.003) were greater than 40 points. And the differences were statistically significant; compared to different individual character-istics, being a student cadre (t=3.494, P=0.001) or not is of statistical significance. ②The total average score of communication ability (t=3.219, P=0.002) for college nursing students,as well as the score of providing effective negative feedback (t=6.790, P=0.000) and supportive communication (t=4.267, P=0.000) were significantly higher than median 3.00. And the differences were statistically significant. Conclusion In order to improve the critical thinking ability and interpersonal communication ability of nursing students, and educate the nursing students to adapt to society and complicated clinical nursing environment, it is necessary to reform the curriculum setting, curriculum design and teaching method.%目的:了解大专护理学生的评判性思维能力、人际沟通能力现状,为教学改革提供参考。方法将由香港理工大学彭美慈教授翻译和修订

  9. 全国医院检验科临床检验项目基本情况现状调查与分析%Investigation and analysis of current application status of testing items of clinical laboratories in China

    Institute of Scientific and Technical Information of China (English)

    钟堃; 王薇; 何法霖; 王治国

    2015-01-01

    目的:了解我国目前医院检验科所涉及的检验项目、各项目检测量、所需费用以及检验项目周转时间( TAT)等情况。统计出所占统计量比重较大的检验项目,以期更好的进行质量控制,为财政投入以及政策制定给出建议。方法在我国每个省、自治区和直辖市中(除西藏和台湾)随机选取三级甲等医院、三级医院和二级医院各3家,共270家医院。向医院检验科负责人发送调查表,检验科通过卫生部临床检验中心网络系统回报调查表。结果汇总后使用Microsoft Excel 2007进行统计分析。所调查的信息包括:医院基本信息、所开展的检验项目、组合项目、年检测量、收费、TAT等。结果270家医院都回报了有效结果,回报率为100%。检验单项共628项。临床免疫、血清学的检验项目种类最多,230项,占36.62%(230/628)。临床生物化学专业的总检测量最高达到59.97%。检测量最多的前100个检验单项的检测量之和超过了所有项目检测总量的90%。收费最多的前100个检验单项的收费之和超过了收费总和的85%。结论本次调查研究所得到的我国医院检验科的检验项目、检测量、收费、TAT等相关信息,可以为我国检验学相关项目和专业的质量控制、财政投入以及政策制定提供有参考价值的信息。(中华检验医学杂志,2015,38:637-641)%Objective To investigate the current application status of clinical laboratories in China, including:testing items, the testing amount of each item, total cost of each item and turnaround time ( TAT) of each item.The testing tem with larger proportion of testing amount required better quality control, more financial investment and policy making.Methods Except Tibet and Taiwan, 30 provinceswere included in this investigation.3 grade A tertiary hospitals, 3 tertiary hospitals and 3 secondary hospitals were

  10. Steering Multiple Reverse Current into Unidirectional Current in Deterministic Ratchets

    Institute of Scientific and Technical Information of China (English)

    韦笃取; 罗晓曙; 覃英华

    2011-01-01

    Recent investigations have shown that with varying the amplitude of the external force, the deterministic ratchets exhibit multiple current reversals, which are undesirable in certain circumstances. To control the multiple reverse current to unidirectional current, an adaptive control law is presented inspired from the relation between multiple reversaJs current and the chaos-periodic/quasiperiodic transition of the transport velocity. The designed controller can stabilize the transport velocity of ratchets to steady state and suppress any chaos-periodic/quasiperiodic transition, namely, the stable transport in ratchets is achieved, which makes the current sign unchanged.

  11. Investigation and analysis on the current situation of postpartum depression among the women at six weeks after delivery%产后6周妇女产后抑郁症现状调查分析

    Institute of Scientific and Technical Information of China (English)

    谭红彤; 刘丹; 陈敏枝; 王巧敏; 黄新颜; 叶瑞萍; 许正先

    2012-01-01

    Objective: To analyze the current situation of postpartum depression among the women at six weeks after delivery in Foshan city. Methods: A total of 3 947 postpartum women who received postpartum examination at 42 days after delivery in maternal health care outpatient of the hospital from December 2010 to November 2011 were investigated and analyzed by Edinburgh postnatal depression scale (EPDS) . Results- The incidence of postpartum depression was 30. 50%. There was statistically significant difference in the incidence of postpartum depression among the women in different age groups and with different educational levels (P <0.05) . The risk factors of postpartum depression among the women were low age (44.14% ), vaginal midwifery (38.46% ), low educational level (35.99% ),, conceiving for more than four times (33.44% ), giving birth to babies for three times (33. 33 % ), the unemployed (31.98% ), and working class (31. 17% ) . The main manifestations of postpartum women included self - accusation (59. 84% ), anxiety (51.16% ), bad coping ability (33.72% ) , and fear (30.05% ), 7.02% of the postpartum women had self - injury ideation. Conclusion: The incidence of postpartum depression among the women at six weeks after delivery was high; strengthening nursing and intervention of postpartum women during puerpe-riuin, paying attention to the psychological changes of postpartum women during puerperium, providing active supports from the society and families can reduce the onset of psychological disorders and promote physical and psychological health of the postpartum women.%目的:分析佛山地区妇女产后6周产后抑郁症发生现状.方法:采用爱丁堡抑郁量表(EPDS)对2010年12月~2011年11月在佛山市妇幼保健院妇女保健门诊作产后42天检查的3 947名产妇进行调查分析.结果:产后抑郁症的发生率为30.50%,产后抑郁症的发生在不同的年龄、文化程度之间差异有统计学意义(P<0.05).产妇产后抑

  12. 上海市精神卫生服务专业机构医生队伍现状分析%Investigation and analysis of the current status of doctor team in shanghai mental health professional institutions

    Institute of Scientific and Technical Information of China (English)

    陈圣祺; 谢飞; 张广岐

    2015-01-01

    Objective At the end of 2013,the survey studied the current status and future demands of doctor team from 24 men-tal health professional institutions in Shanghai in an effect to provide scientific basis for the relevant governmental authorities to better implement the training project for standardization of residency psychiatrists. Methods Investigations and studies were conducted in 24 public mental health professional institutions in Shanghai by using self-prepared questionnaire. In-depth interviews and verifications were employed to follow up on the figures from such questionnaire. Results The 24 specialized hospitals actually have 13159 in-pa-tient beds open to public. There are 1046 doctors in all,among which 609 hold intermediate or higher level of qualifications. 323 are residency doctors,and 114 are of other subjects. The ratio of number of beds and number of doctors is 12. 58:1. In the past 4 years, 171 residency doctors standardization trainees have been recruited,however,331 psychiatrists are required for Shanghai mental health medical professional institutions at all levels for the in-coming 3 years,which demand excludes that of mental health/psychology de-partment of comprehensive hospitals and other private mental health specialized medical institutions. Conclusion The lack of psychia-trists in Shanghai is obvious and the professional qualification structure is unreasonable.%目的:调查截止2013年底止,上海市24家精神卫生专业机构医生队伍现状及未来需求,以便为更好地实施精神科住院医师规范化培训项目提供科学依据。方法采用问卷调查方法,对上海市24家公立精神卫生专业机构进行问卷调查和个别深入访谈、核实,内容包括床位数量、医生数量、职称情况、需求情况等。结果24家专科医院实际开放床位13159张,医生数为1046人,床位数与医生数之比为12.58:1;其中具有中、高级职称的医师609人;住院医师323人

  13. 合同制护士职业倦怠与压力应对方式的现状调查%Current Status Investigation of Contract Based Nurse’s Job Burnout and Pressure Coping Style

    Institute of Scientific and Technical Information of China (English)

    王楠; 隗铁夫; 陆宇晗; 米岚; 刘利; 武爱文

    2014-01-01

    目的:了解北京大学肿瘤医院合同制护士工作倦怠和压力应对方式的现状,为肿瘤专科医院合同制护士职业压力的管理提供有效依据.方法采用 Maslach职业倦怠量表和压力应对方式问卷对北京大学肿瘤医院261名合同制护士进行调查.结果261名合同制护士存在一定职业倦怠现象,工作倦怠量表3个维度的得分均高于 Maslach常模(均P<0.01);不同科室、护龄的合同制护士应对方式问卷的得分差异有统计学意义(均P<0.05);合同制护士的情感衰竭(emotional exhaus-tion,EE)、去人格化(depersonalization,DP)维度与应对方式的退避、幻想和自责维度均呈正相关,与求助、合理化及解决问题维度均呈负相关(均P<0.05);个人成就感降低(reduced personal accomplishiment,PA)维度与退避、幻想和自责维度均呈负相关,与求助、合理化及解决问题维度均呈正相关(均P<0.05).结论医院管理者应针对合同制护士的特点,制定较为完善的合同制护士考核制度,提供良好的工作环境,以促进其身心健康.%Objective To understand the current status of contract based nurse’s job burnout levels and coping styles in Peking Cancer Hospital,and to provide the basis for effective management of occupational stress.Methods By using Maslach job burnout scale and pressure coping style questionnaire to investigate 261 nurses employed under contract of Peking Cancer Hospitals.Results All 261 nurses had certain level of job burnout,the score of the 3 dimension of job burnout scale were higher than normal Maslach (all P<0.01).There were statistic significance of score of coping style questionnaire between contract nurses in different department and working years (all P<0.05).The EE and DP dimension were positively correlated with withdraw,fantasy and self blaming dimension,and negatively correlated with seek help and reasonable and problem solving dimension (all P<0

  14. The Current Situation Investigation of Health Behaviors of Pupils in Nayong County in Guizhou Province%贵州省纳雍县农村小学生卫生行为现状调查

    Institute of Scientific and Technical Information of China (English)

    郭浩冉; 罗虹

    2012-01-01

    目的:了解贵州农村小学生的卫生行为现状,为制定相对应的健康干预提供依据.方法:采取整群随机抽样的方法,随机抽取贵州省纳雍县3所农村小学3~6年级12个班中519名小学生,采取自行设计的问卷调查农村小学生的卫生现状.结果:3~6年级小学生卫生行为形成率中饭前便后洗手、不随地吐痰、勤剪指甲、早晚刷牙、每3月换一次牙刷、不喝生水、水果洗后再吃的形成率分别为47.76%、69.56%、43.93%、71.68%、44.12%、42.77%、69.36%;被调查学校中无一所开展健康教育课程或宣教.结论:纳雍县农村小学生的卫生行为形成率较低,老师、家长及电视是农村小学生健康知识的主要来源,故应大力加强健康教育,尤其是学校对于健康知识的宣教.%Objective: To understand current situation of health behaviors of pupils in Guizhou province, and so as to provide evidence for establishment of relevant health intervention measures. Methods : Cluster random sampling method was employed, and grade 3-6 pupils in three rural primary schools of Nayong county were randomly selected. Self designed questionnaire was carried out to study the heath situation of rural primary school students in Guizhou province. Results: There were 519 pupils in 12 classes of three rural primary schools under investigation. The formation rates of washing hands before and after meals, no spitting, shearing nails frequently, brushing teeth every morning and night, changing toothbrush every 3 months, not drinking raw water and eating washed fruits were 47. 76% , 69.56% , 43.93% , 71. 68% , 44.12% , 42.77% and 69. 36% respectively. All the studied primary schools did not develop health education. Conclusions: The formation rates of health behaviors of rural pupils in Nayong county are low, and their health knowledge almost comes from teachers, parents and television. Health education should be strengthened in rural primary

  15. Investigation and Analysis on Current Condition of Medical Ethics Consciousness in Animal Experiments in Nursing Students%医护学生在动物实验中的伦理意识调查和分析

    Institute of Scientific and Technical Information of China (English)

    潘丽; 涂腊根; 江婉明; 钟翠芬; 阳小雅; 林小珊

    2013-01-01

    Objective:To investigate the status of current ethical attitudes and animal ethics education in animal experiments in medical nursing students and to discuss and find the methods for solving their psychological confusions. Methods;The self - designed questionnaire was used in 247 medical nursing students. The content involves attitudes toward animal experiments, the understanding of animal protection, present situation of ethical consciousness in animal experiments and the understanding of relationships between animal experiments and clinical work, and part of the students reveived psychological interview. Results: 64. 7% of the nursing students accept animal experiments, and 35. 3% of the medical students feel confused or direct against animal experiments. Ethical education in animal experiments was at shortage, most students were not clear for the purpose of opening animal experiment and how to study and so forth. Conclusion; Teachers should help medical students to analyze the rationality of the animal experiments; doing more work in animal ethical regulations propaganda; continuous research for nursing experimental projects.%目的 了解医护学生对于动物实验的态度和动物伦理教育的现状,探讨解决医护学生心理困惑的途径及方法.方法 采用自制调查问卷的方法,对247名医护学生进行问卷调查,调查内容涉及医护学生对动物实验的基本看法、对实验动物保护法规的了解、医护学生动物实验的伦理意识现状以及对于动物实验与临床工作的关系四个方面,并对部分医护学生进行心理访谈.结果 64.7%的医护学生接受动物实验,而35.3%的医护学生对此感到困惑或直接反对动物实验.医护学生在动物实验中的伦理教育缺失严重,大部分医护学生对于开设动物实验的目的、如何进行学习等目标不明确.结论 教师必须帮助医护学生分析动物实验的合理性与不合理性;做好动物伦理法规

  16. Investigation of Leakage Current Mechanisms in La2O3/SiO2/4H-SiC MOS Capacitors with Varied SiO2 Thickness

    Science.gov (United States)

    Wang, Yucheng; Jia, Renxu; Zhao, Yanli; Li, Chengzhan; Zhang, Yuming

    2016-11-01

    In this study, the material and electrical properties of La2O3/SiO2/4H-SiC metal-oxide-semiconductor (MOS) capacitors are systematically characterized. Thermal oxidization SiO2 with varying thickness (0 nm, 3.36 nm, 5 nm, 8 nm, and 30 nm) were coated with La2O3 using atomic layer deposition on n-type 4H-SiC. The stacking oxides were measured using atomic force microscopy, transmission electron microscopy, and x-ray photoelectron spectroscopy, and the MOS capacitors were measured by capacitance-voltage and current-voltage measurements. The results demonstrate that the main gate current leakage mechanisms are dependent on the thickness of the SiO2 oxide under the applied electric field. The primary mechanism for current leakage from the La2O3/4H-SiC MOS capacitor follows the Schottky emission mechanism due to its low conduction band offset. In contrast, the current leakage mechanism for the capacitor with a 3.36 nm SiO2 layer follows the Poole-Frenkel emission mechanism on account of its high trap charge density in the gate dielectric and at the interface. When the thickness of the SiO2 layer increases to 8 nm, lower leakage current is observed by reason of the low trap charge density and high conduction band offset when E ≤ 5 MV/cm. As the electric field strength increases to 5 MV/cm and 5.88 MV/cm (30 nm SiO2: 4.8 MV/cm), the main current leakage mechanism changes to the Fowler-Nordheim tunneling mechanism, which indicates that the La2O3/SiO2 stacking structure can improve the properties of MOS capacitors.

  17. Nominations sought for the 2016 Haagen-Smit Prize

    Science.gov (United States)

    2016-09-01

    We, the editors and publishers of Atmospheric Environment invite our readers to nominate papers for the 2016 "Haagen-Smit Prize". The prize is named in honor of Prof. Arie Jan Haagen-Smit, a pioneer in the field of air pollution.

  18. World's Most Advanced Planetarium Opens; University Partners Sought

    Science.gov (United States)

    Duncan, Douglas K.

    2015-01-01

    The 40 year old-Fiske Planetarium at the Univ. of Colorado has remodeled as the most advanced planetarium ever built. The 20m diameter dome features a stunning video image 8,000 x 8,000 pixels, up to 60 frames per second, produced by 6 JVC projectors. It also features the first US installation of the Megastar IIa Opto-mechanical planetarium that projects 20 million individual stars and 170 deep sky objects. You can use binoculars indoor and see individual Milky Way stars.The video projectors have high dynamic range, but not as great as the eye. In order to preserve the remarkable Megastar sky while still using video, each projector shines through a computer controlled variable density filter than extends the dynamic range by about 4 magnitudes. It therefore is possible to show a Mauna Kea quality star field and also beautiful bright videos.Unlike most planetariums, the #1 audience of Fiske is college students - the more than 2,000 who take Introductory Astronomy at Colorado each year. WE ARE SEEKING OTHER UNIVERSITIES WITH FULL-DOME VIDEO PLANETARIUMS to join us in the production of college-level material. We already have a beautiful production studio funded by Hewlett Packard and an experienced full-time Video Producer for Educational Programs. Please seek out Fiske Director Dr. Doug Duncan if interested in possible collaboration.

  19. Member Input Sought to Ensure AGU's Continued Success

    Science.gov (United States)

    Grove, Timothy L.

    2008-11-01

    As an organization, AGU is indeed fortunate. Our Union has a growing membership worldwide with an average annual increase of 5.9% over the last 5 years. We are financially strong; we have planned carefully and managed our assets and our annual budgets so that we are able to navigate difficult times. Our Fall Meeting is ``the'' event for Earth and space scientists from more than 100 countries. Our publications continue to grow and evolve. Our outreach programs are gaining recognition in the communities we serve. Our development efforts are strengthening our ability to do more without taxing the revenues from meetings and publications. AGU is a preeminent scientific society.

  20. Investigation and analysis of the current cognition status of anesthesia-related knowledge for surgical nurses%外科护士对麻醉相关知识认知现状调查与分析

    Institute of Scientific and Technical Information of China (English)

    彭琳; 沈祎蕾; 韩文军

    2016-01-01

    目的 调查并分析某三级甲等医院外科病房护士对麻醉相关知识的掌握情况及其影响因素,为围麻醉期护理管理提供参考. 方法 采用问卷调查法,对上海市某三级甲等综合性医院12个手术科室的护士进行麻醉相关知识调查.调查问卷在文献回顾基础上结合围麻醉期护理常规自行设计,经专家评议和预调查内容效度系数为0.90,信度系数为0.81~0.92.采用整群抽样法,调查所有符合纳入标准的330名护士. 结果 问卷的回收与有效率均为98.18%.324名外科护士对麻醉相关知识的平均得分,折合百分制后为(32±14)分;各维度得分由高至低依次为:麻醉前准备(54±29)分、麻醉后护理要点(31±18)分和基本概念(18±30)分.单因素方差分析显示:学历、职称、年龄、工作年限、科室、是否接受过麻醉课程培训均影响到护士的麻醉相关知识得分且差异有统计学意义(P<0.05);而进一步多元回归分析显示,仅年龄、科室以及是否参加过培训进入回归方程,可解释其总变异的35.6%. 结论 建议依据外科护士所在的科室、年资、培训经历等,有的放矢地实施围麻醉期的理论与技能培训,通过多途径系统化培训提高其对麻醉相关知识的认知水平和参与围麻醉期患者管理的能力,从而确保其能够为围麻醉期患者提供更为安全、专业的预见性护理.%Objective To investigate and analysis of the current cognition status of surgical nurses' anesthesia-related knowledge in a certain hospital at the level of grade Ⅲ class A in Shanghai,and to provide a scientific basis for perianesthesia nursing management.Methods Using questionnaires,330 nurses from 12 surgical departments were investigated with their informed consent.Questionnaire was self-designed based on the literature review combined with the perianesthesia care and the validity is 0.90,reliability is 0.81-0.92.Results Both the questionnaire

  1. Investigation of the effect of Ag addition on the critical current density of the high-temperature superconductor Nd1.85Ce0.15CuO4

    Science.gov (United States)

    Radhikesh Raveendran, N.; Vinod, K.; Amaladass, E. P.; Janaki, J.; Mani, Awadhesh

    2016-07-01

    We have synthesized a Nd1.85Ce0.15CuO4 + Ag composite system with the aim of studying the effect of Ag addition in the electron-doped system Nd1.85Ce0.15CuO4 on its superconducting and magnetic properties. Measurements of magnetization using a vibration sample magnetometer indicate a systematic increase in diamagnetic shielding upon Ag addition. A subsequent analysis of the critical current density using the Bean model indicates a small but significant increase in intra-grain critical current density upon Ag addition. From the study of the dependence of electrical resistivity on the temperature and electrical current, an increase in inter-granular critical current has also been evidenced upon Ag addition. These results correlate well with the earlier reports of a similar improvement in the properties on the hole-doped ceramic superconductor/Ag composites. Possible reasons for the enhancement of JC have been described and discussed. Magnetic characterization by AC susceptibility using a SQUID magnetometer has been presented for a representative composition, which enabled delineation of the inter- and intra-granular transitions.

  2. 2013-2014 California Current Ecosystem (CCE14): Acoustic-Trawl Survey of Coastal Pelagic Fishes (Legs I and II); and Investigations of hake survey methods, life history, and associated ecosystem (Legs III and IV) (SH1405, EK60)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The 2014 acoustic-trawl method (ATM) project aboard Bell M. Shimada represents a joint effort between the SWFSC and the NWFSC in investigating elements of the...

  3. 2013-2014 California Current Ecosystem (CCE14): Acoustic-Trawl Survey of Coastal Pelagic Fishes (Legs I and II); and Investigations of hake survey methods, life history, and associated ecosystem (Legs III and IV) (SH1405, ME70)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The 2014 acoustic-trawl method (ATM) project aboard Bell M. Shimada represents a joint effort between the SWFSC and the NWFSC in investigating elements of the...

  4. An Investigative Redesign of the ECG and EMG Signal Conditioning Circuits for Two-fault Tolerance and Circuit Improvement

    Science.gov (United States)

    Obrien, Edward M.

    1991-01-01

    An investigation was undertaken to make the elctrocardiography (ECG) and the electromyography (EMG) signal conditioning circuits two-fault tolerant and to update the circuitry. The present signal conditioning circuits provide at least one level of subject protection against electrical shock hazard but at a level of 100 micro-A (for voltages of up to 200 V). However, it is necessary to provide catastrophic fault tolerance protection for the astronauts and to provide protection at a current level of less that 100 micro-A. For this study, protection at the 10 micro-A level was sought. This is the generally accepted value below which no possibility of microshock exists. Only the possibility of macroshock exists in the case of the signal conditioners. However, this extra amount of protection is desirable. The initial part deals with current limiter circuits followed by an investigation into the signal conditioner specifications and circuit design.

  5. Investigation of the fatigue and short-term mechanical properties of 13% chromium steel and titanium alloys after welding or treatment with high-frequency currents as applied to steam-turbine blades

    Science.gov (United States)

    Gonserovskii, F. G.; Nikitin, V. I.; Silevich, V. M.; Simin, O. N.

    2008-02-01

    We present the results of a study on comparing the structural strength of rotor blades made of stainless 13% chromium steels for their design versions in which wear-resistant straps made of cast VZK stellite are soldered or welded on the blade inlet edges. It is shown that treatment of VT6 alloy with high-frequency currents increases the endurance limit of the zone subjected to strengthening and makes the alloy more resistant to erosion. The worn blades of a 48-T4 titanium alloy repaired with the use of welding technologies have operational characteristics at least as good as those of newly manufactured ones.

  6. A Study to Compare the Failure Rates of Current Space Shuttle Ground Support Equipment with the New Pathfinder Equipment and Investigate the Effect that the Proposed GSE Infrastructure Upgrade Might Have to Reduce GSE Infrastructure Failures

    Science.gov (United States)

    Kennedy, Barbara J.

    2004-01-01

    The purposes of this study are to compare the current Space Shuttle Ground Support Equipment (GSE) infrastructure with the proposed GSE infrastructure upgrade modification. The methodology will include analyzing the first prototype installation equipment at Launch PAD B called the "Pathfinder". This study will begin by comparing the failure rate of the current components associated with the "Hardware interface module (HIM)" at the Kennedy Space Center to the failure rate of the neW Pathfinder components. Quantitative data will be gathered specifically on HIM components and the PAD B Hypergolic Fuel facility and Hypergolic Oxidizer facility areas which has the upgraded pathfinder equipment installed. The proposed upgrades include utilizing industrial controlled modules, software, and a fiber optic network. The results of this study provide evidence that there is a significant difference in the failure rates of the two studied infrastructure equipment components. There is also evidence that the support staff for each infrastructure system is not equal. A recommendation to continue with future upgrades is based on a significant reduction of failures in the new' installed ground system components.

  7. Hemorrhagic transformation after cerebral infarction: current concepts and challenges

    OpenAIRE

    Zhang, Jie; Yang, Yi; Sun, Huijie; Xing, Yingqi

    2014-01-01

    Hemorrhagic transformation (HT) is a frequent complication of acute ischemic stroke that is especially common after thrombolytic therapy. The risk of HT limits the applicability of tissue plasminogen activator (tPA). Here, we sought to review the rate, classification, predictors, possible mechanism, and clinical outcomes of HT, as well as existing therapeutic approaches, in order to call attention to the current challenges in the treatment of this complication.

  8. 龙狮运动市场化运营现状调查研究%Investigation and Study of Current Marketization Operation Situation of Chinese Dragon and Lion Dance

    Institute of Scientific and Technical Information of China (English)

    张伟伟; 李晓呜; 林劲杨

    2012-01-01

    With the methodd of literature, expert interview, survey, mathematical statistics, induction and deduction and other research methods, the paper studies the current conditions and the influencing factor of Chinese dragon and lion dance, the long-term planning and countermeasures of Chinese dragon and lion dance Association's development trend. On the current conditions of Chinese dragon and lion dance, attention of the government, public participation, social support, frequent events and activities organized, all these gradually increase have taken shape, they became drive national dragon lion movement development leader and lever, and play a positive role for the promotion and development of Chinese dragon and lion dance.%文章运用文献资料法、专家访谈法、调查法、数理统计、归纳演绎法等研究方法,对龙狮运动发展的现状和影响因素,以及龙狮运动协会的发展趋势进行长远规划与对策研究;,就龙狮运动目前发展而言,政府的重视、群众的参与、社会的支持、赛事活动的频繁举办并逐渐增加的局面已经形成,成为带动全国龙狮运动发展的龙头和杠杆,为龙狮运动的推广和发展发挥了积极的作用。

  9. On the investigation and analysis of the current state of venues and facilities management of community fitness in Nanyang city%南阳市社区体育健身场地器材管理现状调查

    Institute of Scientific and Technical Information of China (English)

    李江; 邓凤莲

    2012-01-01

    采用文献法、调查法、数理统计法、逻辑归纳法等研究方法,对南阳市具有代表性的五大社区健身场地器材的种类、配备情况、使用情况等进行了调查.调查显示,南阳市社区体育健身场地器材存在的问题有:社区健身场地被私人化,健身场所卫生无人管;健身器材露天安放,无人维护检修;社区健身场地没有相关的健身规章制度和指导;社区体育健身场地器材布局不够合理.针对上述问题,提出了改善南阳市社区体育健身场地器材管理的相应建议.%By means of literature research, investigation, statistics, induction methods and so on, the investigation of the types, equipment, and use of fitness facilities of the representatives of the five large Nanyang communities is carried out. It is investigated that in those aspects there are some problems on the fitness facilities, for example, the venues of community fitness are privatized, the sanitary of the fitness venues is not effectively managed; the facilities are equipped in the open air, the overhaul of them cannot be done regularly; no relevant rules and regulations govern the management of the venues and fitness facilities; the facilities are not reasonably arranged. Above all, this thesis puts forward some constructive suggestions to improve the management of venues and facilities of community fitness in Nanyang city.

  10. Investigating Classroom Teaching Competencies of Pre Service Elementary Mathematics Teachers

    Science.gov (United States)

    Gokalp, Murat

    2016-01-01

    The study has sought answers to two major questions: What is the current situation in Elementary Mathematics Education programs at Faculty of Education in terms of classroom teaching competencies? To what extent do pre service teachers acquire these competencies? The research was conducted on 202 senior pre service teachers studying at the…

  11. Current state of peatland soils as an effect of long-term drainage – preliminary results of peatland ecosystems investigation in the Grójecka Valley (central Poland

    Directory of Open Access Journals (Sweden)

    Glina Bartłomiej

    2016-03-01

    Full Text Available Understanding the effect of long-term drainage of peatland areas is helpful in future peatland management and regulations of water conditions. The aim of this work was to assess the current state of fen peatland soils in the Grójecka Valley (eastern part of the Wielkopolskie voivodeship, central Poland, affected by long-term agricultural use (pastures, meadows since the 1960s and potentially by lignite open pit mining industry (KWB Konin since 1980s. Field studies were carried out in 2015 in selected fen peatland areas. Soil material for laboratory analysis was collected from genetic horizons from four soil profiles. The surface horizons of studied organic and organo-mineral soils were built with well-developed moorsh material. They were classified as medium moorshiefied – MtII (profile 1, 3 and 4 and strongly moorshiefied – MtIII (profile 2. Obtained results of physical and physico-chemical analysis indicate that long-term peatland utilization connected with potential impact of the lignite mining, transformed mainly the upper horizons of studied organic and organo-mineral soils. However, despite obvious strong human impact on peatlands ecosystems, we cannot exclude the climate variables, what should be confirmed by long-term monitoring program. Furthermore, presented paper indicated that new subtype moorsh-muddy soils (in Polish: gleby murszowo-mułowe within the type of gleyic soils should be implemented in the next version of Polish Soil Classification.

  12. Thoughts on the Problems of Research Method in the Investigation of Current Situation of Taekwondo%跆拳道运动现状调查方法存在的问题及几点思考

    Institute of Scientific and Technical Information of China (English)

    罗微; 李来

    2015-01-01

    近些年来,跆拳道运动的普及与发展促进了体育学术界对跆拳道运动的研究。本文以文献研究为主要方法,依据从1737篇以“跆拳道”为篇名中核心概念的文章中甄选出的25篇跆拳道运动现状调查的文章(不包括学校和经营性的以跆拳道俱乐部、跆拳道馆为篇名的现状调查),揭示出其调查方法中存在的六个问题,试图提起研究者们的注意,为促进调查方法的科学性、可靠性提供某些参考。%Among the 1737 articles whose core concept in its name is 'Taekwondo',25 articles (excluding surveys in the name of school and business Taekwondo clubs or taekwondo Kwan)on the survey of current situation of Taekwondo are chosen with the method of document research to expose the six problems in their survey methods. This paper aims to call researchers'attention to these problems and provides some guidance for scientific and reliable research methods.

  13. 关于军训学生军纪认同现状的调查与分析%Investigation and Analysis on the Current Situation of the Training Students' Military Identification

    Institute of Scientific and Technical Information of China (English)

    敖贵才

    2016-01-01

    文章通过问卷和访谈,从实证角度揭示军训学生对军纪要求的认同现状及原因。通过对比军训学生在军训前后学生军纪认同各维度的变化,得出军训后学生“观念与认知、他律与自律、教化与内化”三个维度提高较大,“遵守与执行、忠诚与归属”两个维度提高较小等研究结论。%Through the questionnaire and interviews, this paper announces the current situation of training students' military requirements and the causes from the demonstration perspective. By comparing the changes of each dimension of the training students' military identification before and after military training, it is obtained that the three dimensions of "concept and cognition, heteronomy and self-discipline, enlightenment and internalization"have great improvement, the two dimensions of "compliance and enforcement, loyalty and belonging"have small improvement.

  14. An Investigation of the Current Situation of the Women's Self-Defense In Some Colleges of Nanjing City%南京市部分高校女子防身术开展现状的调研

    Institute of Scientific and Technical Information of China (English)

    罗勇

    2015-01-01

    Through the investigation of some colleges and universities in Nanjing city added the female self-defense class, this paper analyzes the main reasons which impact on women's self-defense courses offered in colleges and universities, and takes feasibility study on women's self-defense which is in order to find out problems and put forward the corresponding suggestion.%通过对南京市部分高校增设女子防身术课程的状况进行调查,分析对女子防身术课程在高校开设造成影响的主要原因,对女子防身术课程的开设进行可行性研究,找出问题,提出相应建议。

  15. 高职新生宿舍人际关系现状调查分析%Investigation and Analysis of Current Situation of Vocational College Freshmen Dormitory Interpersonal Relationship

    Institute of Scientific and Technical Information of China (English)

    王瑞荣

    2014-01-01

    A problem that every enrolled higher Vocational Education school students , especially Freshman must be faced with the dormitory interpersonal relationship. Higher vocational students spend much time in dormitory, dormitory is a necessary site of living and learning. Therefore, the membership relationship in the same dormitory is the main after-class relationship of higher vocational students except learning . This paper uses the sample investigation, self-designed questionnaire to investigate and analyze the status of the vocational col ege students dormitory interpersonal relationship, provides some references to help Vocational Education freshmen to establish good dormitory interpersonal relationship .%高职生特别是大一新生进入大学期间,每个人所必须面对的问题是宿舍的人际关系。宿舍成为高职生除课堂外活动时间最多的空间,是其生活和学习的必要场所。因此,与同宿舍其他成员之间的关系成了高职生除了学习之外课余生活的主要关系。本文采用抽样调查,自行设计问卷的方式调查并分析了我院高职新生宿舍人际关系的现状,为高职新生建立良好宿舍人际关系提供一些参考作用。

  16. Watershed Investigations

    Science.gov (United States)

    Bodzin, Alec; Shive, Louise

    2004-01-01

    Investigating local watersheds presents middle school students with authentic opportunities to engage in inquiry and address questions about their immediate environment. Investigation activities promote learning in an investigations interdisciplinary context as students explore relationships among chemical, biological, physical, geological, and…

  17. 军队医院文职护士灾难救援能力的现状%Investigation on the Current Status of Disaster Rescue Ability of Non-active Civilian Nurses in Military Hospital

    Institute of Scientific and Technical Information of China (English)

    乔安花; 卢根娣

    2014-01-01

    Objective To investigate the disaster rescue ability of the non-active civilian nurses in military hospitals,and so as to provide scientific evidence for the disaster rescue training.Methods 35 non-active ci-vilian nurses were enrolled by using convenience sampling method from two military hospitals,and investi-gated by self-designed questionnaire.Results The non-active civilian nurses had the strong will to perform the disaster rescue mission,and they had a good master for the disaster rescue knowledge such as the con-cept,the five first aids skills include cardiopulmonary resuscitation skills,hemostatic skills,bandaging skills,fixing and transport skills.But they had a poor master for nuclear-biological-chemical medical knowledge,outdoor survival skills training and inj ury assessment.Conclusion There is an urgent need for improving the disaster rescue ability of the non-active civilian nurses,and the military medical knowledge and outdoor survival skills should be strengthened in military training.%目的:了解某军队医院文职护士的灾难救援能力现状,为文职护士灾难救援能力培训提供科学依据。方法采用自行设计的军队文职护士灾难救援能力现状调查表,通过方便抽样对某军队2所三甲医院35名文职护士进行调查。结果军队文职护士执行灾难救援任务意愿较强,在灾难护理知识掌握上,对灾难护理概念、五大急救技术(即心肺复苏、止血、包扎、固定和转运)掌握较好,但是对三防医学救援知识、野外生存技能和伤情评估相关知识掌握欠佳。结论军队医院文职护士的灾难救护能力亟需全面提高,在平时战备训练中尤其应加强军事医学知识和野外生存能力的训练,以适应各种灾难救援的需要。

  18. 清远市农村妇女妇科疾病患病状况的现况调查%Investigation on the current situation of prevalence of gynecological diseases among the rural women in Qingyuan city

    Institute of Scientific and Technical Information of China (English)

    伍杏梅; 张小新; 陈建华; 肖淑君; 向杏群; 沈锦红; 朱春燕

    2012-01-01

    目的:了解清远地区农村妇女常见妇科病的流行状况及流行特征,为建立有效的农村妇女保健运作模式提供依据.方法:采用整群随机抽样的方法抽取研究对象,抽中清远市贫困地区9个镇的年龄为18 ~59岁的全体已婚农村妇女作为调查对象.结果:农村妇女妇科病患病率为58.63%;患病前3位顺位为阴道炎、宫颈炎、卵巢肿瘤;不同年龄组患病率有统计学差异,41~50岁年龄组患病率最高(40.21%).结论:贫困地区妇女妇科疾病患病率较高,应建立有效的农村妇女保健运作机制,促进农村妇女的生殖健康.%Objective; To understand the current situation and characteristics of prevalence of common gynecological diseases a-mong the rural women in Qingyuan city, provide a basis for establishing an effective rural maternal health care mode. Methods: Cluster random sampling method was used to select study objects, all the married rural women aged 18 -59 years old in nine towns of poverty - stricken area of Qingyuan city were selected as respondents. Results; The prevalence of gynecological diseases among the rural women was 58. 63% , the top three gynecological diseases were vaginitis , cervicitis, and ovarian tumors; there was significant difference in the prevalence of gynecological diseases among different age groups, the prevalence among 41 -50 - year - old group was the highest (40. 21% ) . Conclusion; The prevalence of gynecological diseases among the rural women in poverty - stricken area was relatively high, effective rural maternal health care mode should be established to promote reproductive health of rural women.

  19. 老年患者使用苯二氮类镇静催眠药现状调查%Current Situation Investigation of the Benzodiazepines Sedative Hypnotics in Elderly Patients

    Institute of Scientific and Technical Information of China (English)

    杨楠; 管璐艳

    2015-01-01

    目的:了解社区老年患者使用苯二氮 类镇静催眠药的现状,为今后指导合理用药提供依据. 方法:对2015年7~9月全科门诊就诊的老年患者进行问卷调查. 结果:长期使用苯二氮 类药物1165人,其中女性占63.26%,明显高于男性. 医生指导下服用苯二氮 类药物的患者睡眠改善率显著高于其他原因用药,而不良反应发生率显著降低,并且更显著了解所服药物的不良反应,P<0.05. 结论:失眠患者女性多于男性,部分患者存在滥用药物倾向,长期使用苯二氮 类危害性大,应结合老年患者特点,给予相应的用药指导,提高老年患者生活质量.%Objective:To understand the current situation that the elderly patients took benzodiazepines sedative hypnotics in commu -nity and provide the basis for guiding the rational use of medicines in the future .Methods:Questionnaire survey was conducted for gen-eral outpatient clinic elderly patients from July to September 2015.Results:There are 1165 people who took long-term use of benzodiaz-epines medicine .The female is accounted for 63.26%, significantly higher than the male .The sleep improvement rate of the patients who took benzodiazepines medicine under the guidance of doctor was significantly higher than that of other medicines , significantly reduced the incidence of adverse reactions , and much more significantly understood the medicine adverse reaction , P <0.05. Conclusion:The number of female is more than that of male among insomnia patients .Many patients tend to abuse medicines .The harmfulness of long-term use of benzodiazepines is big .Combining with the characteristics of the elderly , we should reduce insomnia and medicine use to improve the life quality of the elderly .

  20. An Investigation Of The Current Situation Of The Development Of Taekwondo Club In Tianjin%对天津市跆拳道俱乐部现状的调查与分析

    Institute of Scientific and Technical Information of China (English)

    徐福振

    2012-01-01

    With the five typical fitness clubs in Tianjin as the main research object,by questionnaire,interview and literature research methods,the clubs' ground on taekwondo,qualification,price acceptable level,coach comprehensive quality and consumer groups and a series of investigation,interview,attempts to the above analysis,this article analyzes the present situation of the development of the youth fitness taekwondo and the existing problems,and puts forward some suggestions of the fitness taekwondo development.%以天津市跆拳道俱乐部中具有代表性的5个俱乐部为主要研究对象,通过问卷调查、访谈和文献等研究方法,对跆拳道俱乐部的场地情况、资质情况、价格可接受程度、教练综合素质和消费群体等一系列情况进行调查、走访,试图通过对上述的分析,剖析青少年健身跆拳道发展现状以及存在的问题,提出健身跆拳道发展的几点建议。

  1. Interactive association between biopolymers and biofunctions in carinata seeds as energy feedstock and their coproducts (carinata meal) from biofuel and bio-oil processing before and after biodegradation: current advanced molecular spectroscopic investigations.

    Science.gov (United States)

    Yu, Peiqiang; Xin, Hangshu; Ban, Yajing; Zhang, Xuewei

    2014-05-07

    Recent advances in biofuel and bio-oil processing technology require huge supplies of energy feedstocks for processing. Very recently, new carinata seeds have been developed as energy feedstocks for biofuel and bio-oil production. The processing results in a large amount of coproducts, which are carinata meal. To date, there is no systematic study on interactive association between biopolymers and biofunctions in carinata seed as energy feedstocks for biofuel and bioethanol processing and their processing coproducts (carinata meal). Molecular spectroscopy with synchrotron and globar sources is a rapid and noninvasive analytical technique and is able to investigate molecular structure conformation in relation to biopolymer functions and bioavailability. However, to date, these techniques are seldom used in biofuel and bioethanol processing in other research laboratories. This paper aims to provide research progress and updates with molecular spectroscopy on the energy feedstock (carinata seed) and coproducts (carinata meal) from biofuel and bioethanol processing and show how to use these molecular techniques to study the interactive association between biopolymers and biofunctions in the energy feedstocks and their coproducts (carinata meal) from biofuel and bio-oil processing before and after biodegradation.

  2. The investigation of current situation and requirement of preconception care in Baoan district of Shenzhen%深圳市宝安区孕前保健现状及需求调查

    Institute of Scientific and Technical Information of China (English)

    刘小凤; 刘小雅; 宋秀玲; 王瑛; 翟剑

    2015-01-01

    Objective To explore current situation and requirement of preconception care in Baoan district of Shenzhen . Methods A total of 1 080 primiparas conducted prenatal examination in the Family Planning Specialist Hospital of Shenzhen Baoan District and Songgang People’ s Hospital from Jan 2013 to Jan 2014 were selected .Interview and questionnaire were used to analyze the current situation and requirement of preconception care among respondents .Results 1 038 valid questionnaires were retrieved , only 37.19%( 386/1038 ) primiparas had participated in preconception care .The preconception care rate of respondents with high education degree was higher than that of respondents with low education degree (P<0.05).76.49%(794/1038) respondents had heard of preconception care , while most of them didn ’ t comprehensive understand the content .34.10%(354/1038) respondents had taken folic acid supplements in progestation , but the correct use rate was only 6.78%(24/354).The priorities of approaches to acquire knowledge were friends and colleagues , network, community outreach and medical institutions .The priorities of expecting approaches to acquire knowledge were online media , community outreach and medical institutions .The priorities of medical institution choice were maternal and child health care or women's and children's hospital , community hospitals and comprehensive hospital . Conclusion The participation rate , cognition degree , compliance of preconception care and folic acid use rate are low in Baoan district of Shenzhen .It is imperative to improve the knowledge training on preconception care as well as the forms and contents of the services.The institution should improve service levels to meet the requirements of preconception care .%目的:了解深圳市宝安区孕前保健现状及需求情况。方法将2013年1月至2014年1月深圳宝安区首次到宝安区计划生育专科医院和松岗人民医院做产前检查的孕妇1080例作为调查

  3. 辽宁省城乡学前教育状况调查与思考%An Investigation-based Ponder on the Current Situation of Urban-rural Preschool Education in Liaoning Province

    Institute of Scientific and Technical Information of China (English)

    陈齐畅; 王凯文; 马逍; 张羽; 张锦梅

    2011-01-01

    以辽宁省14个市城镇和农村幼儿园及家庭为研究对象,采取入园入户随机问卷调查和走访方式,深入幼儿园和幼儿家庭实地调查。结果显示:无论是幼儿园规模、环境条件、活动设施、师资状况和课程内容,还是幼儿家庭收入水平、监护人文化程度以及幼儿学前教育投入水平,农村与城镇相比都有很大差距。政府增强城乡统筹发展意识,把学前教育重点放在农村,在教育资源上向农村倾斜;对农村幼儿园建设实行以政府投入为主的办学模式;加强对农村幼儿园的指导和管理;对家长开展宣传、培训和业余文化教育活动;幼儿园组织家长会及其经验交流会,提高农村家庭对孩子学前教育的质量,缩小城乡学前教育差距,建设社会主义和谐社会。%An on-the-spot investigation was made in the summer of 2010,in which the urban and rural kindergartens and families from fourteen cities of Liaoning province were used as objects of study and such manners as random door-to-door questionnaire investigation and visit were taken.The results showed that a tremendous gap exists between urban and rural preschool education,which can be seen not only from scale,environment,institution,teaching staff and curriculum,but from family income,preschool education input and the guardian's educational level.Such a situation certainly reflects the general state of the preschool education development in the urban and rural areas of Liaoning province.In order to narrow the gap as soon as possible,it is suggested that the coordination between urban and rural development in preschool education should be strengthened;emphasis be put on rural preschool education;an input mode be set up in which governments at all levels constitute the input mainbody of the rural kindergarten building and development;and the rural kindergartens be further guided and supervised and the rural parents be helped to improve their personal

  4. Investigation on the Current Situation of Extracurricular Sports Activities of Middle School Students in Shanxi Province of Lucheng%山西省潞城一中学生课外体育活动现状调查研究

    Institute of Scientific and Technical Information of China (English)

    秦海风; 张金桥

    2014-01-01

    Using the questionnaire survey method, the extracurricular sports present situation and the influence factors of students of a middle school in Lucheng were investigated and analyzed. The results showed: the students on the whole to participate in extracurricular sports activities on the attitude is more positive; the number and time of students to participate in physical exercise less; students in the choice of sports, ball, jogging and aerobics are, and demonstrated a significant difference in sex; extracurricular sports activities in the main motivation is to enhance physical fitness, interest hobbies, entertainment; the main reason affecting students participating in extracurricular sports activities is the lack of facilities , academic stress, lack of exercise partner.%运用问卷调查等方法,对潞城一中学生课外体育活动现状及影响因素进行调查分析。结果显示:学生对参加课外体育活动的整体上态度较积极;学生每周参与体育锻炼的次数和时间偏少;学生在体育项目选择方面,以球类、跑步和健美操居多,且在性别上表现出显著差异;课外体育活动的动机主要是增强体质、兴趣爱好、消遣娱乐等;影响学生参加课外体育活动的主要原因是缺少场地器材,学业紧张,缺少运动伙伴等。

  5. 高中生主动体育锻炼现状的调查与建议%Investigation and Suggestion on the current Situation of Active Physical Exercises in high school Students

    Institute of Scientific and Technical Information of China (English)

    刘子毅; 李惟英

    2016-01-01

    为了解高中生课余主动体育锻炼的现状,采用问卷调查和访谈的研究方法,对高中生的体育锻炼时间、频率、态度与所喜爱的项目、体育与健康知识的获取途径等一系列问题进行调查与访谈,从数据的角度分析高中生主动体育锻炼的现状,并对培养高中生主动体育锻炼的习惯给出一些建议,如加强课上体育与健康知识的传授、以及基于微信平台引导学生养成主动体育锻炼的方法等。%To understand the present situation of high school students extracurricular physical exercise initiative, using methods of questionnaires and interview investigation to explore a series of answers on high school students’ physical exercise time, frequency, attitude and favorite items sports and health knowledge acquirement. Analysis of the status quo of active exercise of high school students from the perspective of data. and this paper also gave some suggestions help cultivate the habit of physical exercise, such as strengthening teaching of physical and health knowledge in class, and guide students to develop active physical exercise habits through WeChat platform, etc.

  6. 大学英语口语教学形成性评价现状调查与分析%Current Investigation and Analysis of Formative Assessment in Oral English Teaching of Non-English Majors

    Institute of Scientific and Technical Information of China (English)

    秦静

    2012-01-01

    形成性评价与口语教学融为一体,有利于整体口语教育水平的发展,通过问卷调查的形式分析目前大学英语口语教学过程中形成性评价的现状发现:学生在口语形成性评价过程中存在着许多困难;学生所接触的口语形成性评价方式不够广泛;教师在口语形成性评价过程中角色扮演不尽如人意。因此,在英语口语形成性评价过程中学生应努力克服困难,老师应采用多元化、灵活性的评价方式并根据课堂的具体情况扮演好自己的角色。%It promotes the global level of oral English education by combining formative assessment and oral English teach-ing. Via a questionnaire, the present situation of oral English formative assessment of non-English majors is investigated and analyzed. The results show that students still have various difficulties in the process of oral English formative assessment; students are not accessible to abundant formative assessment approaches; teachers play an unsatisfactory role in the process of oral English formative assessment. Consequently, students should make great efforts to overcome the difficulties; teachers should adopt diversified assessment approaches and play a positive part according to the specific classroom conditions.

  7. Current Status Investigation and Analysis on Website Construction of Humanities and Social Science Journals of Guangdong Universities%广东高校人文社会科学期刊网站建设现状调查分析

    Institute of Scientific and Technical Information of China (English)

    许花桃

    2012-01-01

      以广东高校20家人文社会科学期刊为调查对象,使用搜狐、百度、谷歌网络搜索引擎按照刊名或主办单位进行搜索,访问期刊网站,对网站建设现状进行了调查分析,结果显示:70%的期刊建立了自己的网站,其中60%的期刊使用了稿件在线处理系统,可实现编辑出版流程的数字化和网络化;利用期刊独立网站实现优先数字出版尚处于探索阶段,大部分期刊没有重视英文版网站的建设。文中最后还给出了建设和管理期刊网站的一些建议%  The websites of 20 Humanities and Social Science Journals of Guangdong universities were first searched through Internet search engines such as Sohu , Baidu and Google with the journal’s title or sponsor.Then the web-sites were visited.In this paper, the website construction status of these journals were investigated and analyzed . The result shows that 70% journals have their own websites, 60% journals use the online submission systems which help to realize the digitalization and networking of the editing and publishing process , but the advance online publi-cation on their own websites is still in the stage of exploration , most of these journals ignore the construction of Eng -lish websites.Some suggestions on how to construct and manage journal website were also put forward .

  8. 卫生经济学583例节育手术并发症原因调查分析%Cases of Birth control Operation Templeman D.current Investigation and Analysis

    Institute of Scientific and Technical Information of China (English)

    张素萍

    2011-01-01

    Objective:To Quzhou 2000~2002 handan various festival(unique)yukon surgery is the first example was identified as a surgical complications of 99102 example causes were investigated.Methods:We collected various festival (off)the yukon is the surgical complications types,wolume, occurrence,analyze the causes.Results:The discussion reduce birth control operation complications measures stable low birth level,reduce women of child-bearing age of pain and sufferings,improve the quality of family planning technology,ensure the family planning career smoothly.Conclusion:The incidence of complications in the birth control operation directly influence family planning career smoothly.%目的:对邯郸市曲周县2000~2002 年间各种节(绝)育是手术例中鉴定为手术并发症的583 例原因进行调查分析.方法:收集各种节(绝)育是手术并发症的种类、数量、发生率,分析原因.结果:讨论减少节育手术并发症的对策,对稳定低生育水平,减轻育龄妇女的痛苦,提高计划生育技术质量,保障计划生育事业得以顺利进行.结论:节育手术并发症的发生率直接影响计划生育事业的顺利进行.

  9. Investigation on current status of environmental health hazards in Anhui rural areas, 2013%2013年安徽省农村环境卫生健康危害影响因素调查

    Institute of Scientific and Technical Information of China (English)

    马李; 王志强; 冯晓亮; 赵玉琳; 徐艳龙; 郑莉

    2014-01-01

    目的:了解和掌握安徽农村改水改厕情况,垃圾、污水处理及媒介生物防治现状,为政府及相关行政部门制订农村环境卫生改善政策措施提供依据和支持。方法按分层随机方式抽取24个县,480个行政村和2403户,通过查阅资料、访谈、现场观察、实验室检测等方法获得监测数据。结果2013年安徽24县农村集中式供水人口比例46.04%,卫生厕所普及率为35.9%。县级污水处理设施匮乏,且主要覆盖县城城区人口,农村地区大量生活、工业及养殖业污水随意排放,未能进行及时有效处理。大多数的调查村无专兼职保洁员,未开展“灭四害”工作。89.3%的调查户房屋周围有病媒生物孳生地。480份土壤样品中有126份检出蛔虫卵,检出率26.3%,其中有84份检出活卵,活卵检出率17.5%;31.9%的镉含量超出国家二级土壤标准。结论安徽农村环境卫生现状不容乐观,存在各种影响人群身体健康的危险因素,需进一步采取各种有效措施改善农村环境卫生现状。%Objective To understand the current status of water and sanitation improvement, garbage and sewage treatment, and vector control in Anhui province, and provide the basis for the government and relevant administrative departments to formulate rural sanitation improvement program. Methods 2 403 households and 480 villages in 24 counties were selected by proportional stratified randomized sampling. Data were obtained through information collection, interviews, field observation and laboratory testing. Results The coverage rate was 46.04%for access to centralized water supply and 35.9%for access to sanitary latrines in 24 rural counties in Anhui. There was a lack of wastewater treatment facilities in rural areas and mainly covered township residents. Large number of domestic, industrial and aquaculture wastewater was discharged arbitrarily without timely and effective treatment

  10. 石河子市医院口腔科及口腔诊所消毒效果现状调查%Current situation investigation on effect of disinfections in dental medical institutions in Shihezi

    Institute of Scientific and Technical Information of China (English)

    徐江; 郑军; 梁玉霞; 于丽红; 曹丽婷; 侯玉帛

    2014-01-01

    OBJECTIVE To understand the current situation of disinfection monitoring results in dental medical institutions of our city ,so as to provide some effective measures for controlling the nosocomial infection in oral clinics .METHODS A total of 48 dental medical institutions or dental cunics clinics were collected ,among which 22 were outpatient dental in Chinese medicine hospital ,26 were individual household dental clinics .The ambient air , the oral comprehensive treatment chair ,the hands of doctors and nurses and clinics water pollution were monito-ring .The 4 items of monitoring results collected from Jun .2012 to Sept .2012 were analyzed .Excell2003 was used for creating database and SPSS11 .0 software was used for statistical analysis .RESULTS The qualified rate of dental medical institutions of our city was low in 17 .49% ,the qualified rate of outpatient dental department in hospitals was 13 .64% ,private dental clinics was 3 .85% .The percent of passing ambient air ,in dental depart-ment of hospitals ,was 77 .78% .And the private dental clinics was 22 .22% ,and the difference was significant (P<0 .05) .CONCLUSION Disinfection monitoring and staff training of outpatient stomatology department in hospi-tals and private dental clinics should be further strengthened ,standardize the disinfection system ,to improve disinfection qualified rate and to prevent the occurrence of the nosocomial infection in dental medical institutions of our city .%目的:了解石河子市医院口腔科及个体口腔诊所消毒监测结果现状,提出预防和控制口腔科医院感染的有效措施,为临床资料提供参考依据。方法选取2012年6月-2012年9月48所医院门诊口腔科和个体口腔诊所消毒效果监测结果进行分析,其中医院门诊口腔科22所、个体口腔诊所26所;对其环境空气、综合治疗椅、医护人员手及诊疗用水污染等4项进行现场实地监测,采用 Excel 2003建库,SPSS11.0软件进行

  11. Investigation in current status of health-promoting lifestyles among clinical nurses%临床护士健康促进生活方式的现状研究

    Institute of Scientific and Technical Information of China (English)

    张秀梅; 洪静芳; 韩培华

    2012-01-01

    Objective To examine the health-promoting lifestyles of clinical nurses and analyze the relationship between the scores and their socio-demographic characteristics.Methods The researeh design was a cross-sectional descriptive study.The study population was 710 clinical nurses who were working at a class A tertiary teaching hospitals in a certain province.The research instruments included the healthpromoting lifestyle profile and socio-demographic characteristics of objects.Results The research findings showed that the nurses had a relatively poor health-promoting lifestyles with the mean total score at (81.41±21.71); within 52 items,the mean score of each item was (1.57:±0.42).Significant differences were found among sub-dimensions of health-promoting lifestyle profile,while nurses performed best in the interpersonal relations,subsequently followed by self realization,balanced diet,pressure management and health responsibility,but worst in exercise.There was also a statistical difference in the total score of health-promoting lifestyle among nurses who had different characteristics including marital status,education level,professional tifle,income,and taking the night shift.Conclusions The research results should raise the concern of nursing managers and clinical nurses to rectify the current status of relatively poor health- promoting lifestyles among nurses.%目的 调查我国临床护士健康促进生活方式的现状,并分析其得分与人口学资料之间的关系.方法 本研究属于横断面描述性研究.研究人群为便利抽样所得的某省三级甲等教学医院的710名临床护士.研究工具包括健康促进生活方式量表及护士一般人口学资料问卷.结果 临床护士的健康促进生活方式平均得分为(81.41±21.71)分.52项条目平均得分值为(1.57±0.42)分.各个分量表的平均得分存在显著差异,以人际支持发展最高,其次为自我实现,均衡饮食,压力管理,健康责任,运动保健

  12. Investigation and study on current situation and influencing factors of core midwifery competency in Beijing%北京市助产士核心胜任力现状及影响因素的调查研究

    Institute of Scientific and Technical Information of China (English)

    张贤; 陆虹

    2013-01-01

    目的:了解北京市助产士的核心胜任力现状,并分析其影响因素.方法:采用助产士核心胜任力量表对北京市24家二级以上医院的283名助产士进行横断面调查.结果:助产士核心胜任力总均分为4.02 ±0.47.其中分娩期保健能力、孕期保健能力和产后保健能力3个方面能力较好,而孕前保健能力、公共卫生保健能力和新生儿保健能力三个方面相对薄弱.多元回归分析发现,助产工作年限、职务、编制是助产士核心胜任力的影响因素(P<0.05).结论:北京市助产士核心胜任力水平总体较好,但仍有进一步提升的空间,以满足孕产妇及家属日益增长的服务需求,以及助产士工作范畴拓展和助产专业发展的需要.管理者应根据医院自身情况,对不同特征的助产士实施针对性的培训和管理策略,提高助产士的核心胜任力水平.%Objective: To understand the current situation of core midwifery competency in Beijing, and analyze the influencing factors. Methods: A cross - sectional survey was conducted among 283 midwives from 24 hospitals in Beijing was conducted by Midwife Core Competency Scale. Results: The total score of core midwifery competency was (4. 02 ± 0. 47) on average. The competencies of intrap-artum care, antenatal care, and postpartum care were good, while the competencies of progestational care, public health care, and neonatal health care were weak. Multivariate regression analysis showed that the time of midwifery practice, position, and employment category were influencing factors of core midwifery competency ( P < 0. 05 ) . Conclusion: The overall midwifery competency among Beijing midwives are good, but there are still some areas need to be further improved, so as to satisfy the growing health care demand from pregnant women and their families, as well as the development of the midwifery profession. Managers should develop individualized and specific training and regulation

  13. 流行病学论文的医学伦理意识现况调查与启示%Investigation on Current Condition of Medical Ethics Consciousness and its Enlightenment in Epidemiological Research

    Institute of Scientific and Technical Information of China (English)

    孟若谷; 翟炎冰; 陈森; 张晏畅; 张越伦; 赵剑云; 孙凤

    2012-01-01

    目的 描述近5年发表的流行病学论文的伦理意识现状,发现我国流行病学研究中存在的主要伦理学问题.方法 查阅某杂志2006~ 2010年刊登的文献,对其中以人为研究对象的原始论著的伦理意识进行描述.结果 共纳入论著749篇,分析显示:①论文中说明“经受试者知情同意”的论文为29.24%;声明“通过伦理委员会审批”的论文为6.94%;②伦理意识呈逐年上升趋势;③试验性研究论文伦理意识好于观察性研究;④不同研究机构和资金来源的研究伦理意识不同;⑤在采集受试者生物标本和隐私信息等方面的伦理意识较弱.结论 我国流行病学研究的伦理审查和知情同意意识较弱,建议应加强医学伦理学的宣传;发挥伦理委员会审查职能,规范伦理程序;积极完善期刊编审程序,提高编辑伦理素养,发挥期刊导向功能.%Objective:By describing the status of current ethics development in scientific literatures published on Chinese Journal of Epidemiology, to find the main ethical problems exist in epidemiological studies. Methods: Searching and reviewing papers on " Chinese Journal of Epidemiology" from2006 to2010, assess the medical ethical consciousness among the original studies focusing on human beings. Results; There are 749 Chinese articles were recruited, which show that; ①the proportion with announcements of "informed consent by the subjects" is 29. 24% ; the proportion with "possessing approvals from the ethic committees" announced is 6. 94%.②There is an increasing in ethics consciousness through these 5 years. ③Articles derived from trial studies have better ethics data than those from observational studies. ④Different research institutes and founding sources have different ethical review levels. ⑤Ethics consciousnesses are weak in biological specimens collection and privacy protection. Conclusion: The medical ethics consciousnesses in informed consent are still

  14. Vamistor resistor investigation

    Science.gov (United States)

    1973-01-01

    Results are presented of the failure investigation conducted on resistors produced by the Vamistor Divison, Wagner Electric Corporation. This failure investigation included; failure analyses, chemical and metallurgical analyses, failure mechanism studies, seal leak analyses, and nondestructive stress tests. The data, information, conclusions, and recommendation can be helpful in assessing current usage of these resistors.

  15. 大学生同性性倾向者的现状调查与分析%Investigation and analysis of the current situation of college students with homosexual orientation

    Institute of Scientific and Technical Information of China (English)

    李晋; 刘哲

    2014-01-01

    and economical development in recent years,the society is be-coming more and more open.At the same time the homosexual group is enlarging continuously,especially the HIV infected ones,which has done harm to the society.Therefore,we see great importance in conducting investigation and research into such group of people.Never had homosexuality been scarce through the whole human history.In terms of the huge population base of China,the homosexual group taking tiny proportion of the total could have a great impact on society merely with its existence and behaviors.Being the better educated group in the youth popula-tion of China,college students with homosexual orientation haven’t received accurate research results on themselves before.With profound and abundant investigation and analysis on the attitudes towards their homosexual orientation,the understanding of the reason why homosexuality takes place and the identity of physiological and social roles,and the acceptance of the society for the 400 college students (including 180 with homosexual orientation),we reach conclusions below in this paper.1 .The acceptance on homosexual group of college students and the homosexual group’s identity on their sexual behaviors have both increased along with the economic boom and deepening of scien-tific research.2.Through social surveys,it turns out that the acceptance towards homosexual and the identity of ho-mosexual marriage of both the homosexual themselves and heterosexual have increased,which means a more inclu-sive society.3.With more attention from the society,homosexual group has begun fighting for its own rights,on which government should give high attention.4.The proportion HIV-infected ones taking in homosexual is exag-gerating shockingly fast,especially among the MSMgroup,and the infection rate has risen from 0.4%in 2005 to 8. 4% in 2011.So we argue that further and more detailed research should be done on homosexual issues while taking actions to avoid potential

  16. 广东省韶关市白纹伊蚊抗药性现状调查%Investigation on the current status of Aedes albopictus resistance to commonly used insecticides in Shaoguan

    Institute of Scientific and Technical Information of China (English)

    邓惠; 刘旭振; 蓝志忠; 胡应辉; 邹钦

    2015-01-01

    Objective In order to provide a basis for scientific and reasonable use of pesticides, we investigated the resistance of Aedes albopictus to commonly used insecticides in urban area of Shaoguan city. Methods WHO standard bioassay method was applied to calculate LC50 and to obtain resistance index by comparing with susceptible strains. Results The median lethal concentration of Ae. albopictus to beta⁃cypermethrin, decamethrin, dichlorvos, propoxur are 0.0036, 0.0060, 0.2606, 2.1266 mg/L respectively. The resistance index are 3.60, 2.73, 1.53, 1.24 respectively. Conclusion Aedes albopictus in urban area of Shaoguan had low level resistance to beta⁃cypermethrin and decamethrin. It is important to alternate pesticides and choose appropriate doses in mosquito prevention and control.%目的:调查韶关市白纹伊蚊对常用杀虫剂的抗药性,为科学合理使用杀虫剂提供依据。方法按照WHO生物测试法,计算半数致死浓度(LC50)并与敏感品系进行比较得出抗性指数。结果韶关市白纹伊蚊对溴氰菊酯、高效氯氰菊酯、敌敌畏、残杀威的LC50分别为0.0036、0.0060、0.2606和2.1266 mg/L,抗性指数分别为3.60、2.73、1.53和1.24倍。结论韶关市白纹伊蚊对溴氰菊酯、高效氯氰菊酯杀虫剂已产生低度抗性,在实际防治中应注意轮换、合理用药。

  17. 北京市深井人工回灌现状调查与前景分析%Current situation investigation and prospect analysis of artificaial recharge of ground water in Beijing city

    Institute of Scientific and Technical Information of China (English)

    孙颖; 苗礼文

    2001-01-01

    北京市地下水人工回灌研究始于1965年。1981年开始生产性深井人工回灌。由于种种原因,至1999年底实际回灌单位由64个缩减至13个。其间累计回灌量为10734.37×104t。据调查,停灌原因主要有:回灌单位停产、转产、回灌井被占,回灌井阻塞,泵改调频,单位搬迁和改换制冷设备等。本文通过对北京市三十几年来地下水人工回灌工作的总结,分析了人工回灌在近年来发展停滞的原因,并对其在城市可持续发展建设中的节水潜力和今后的发展前景作出了论述。%The study of artificial recharge of ground water in Beijing City started in 1965,and the productive well recharge began in 1981.Due to various reasons,by the end of 1999,the number of artificial recharge units decreased to 13 from 64 at the beginning.The total recharge adds up to 107,343,700 over the period.Investigation result indicates that the main reasons for the stagnation are:Some recharge units stopped production,or switched to other production;Some recharge wells were blocked or taken over for other purposes;Change of location or reconstruction of the refrigeration facilities of the recharge units.This article concluded the artificial recharge of ground water of Beijing City over the past more than thirty years,and analyzed the reason why the development of artifiial recharge has been stagnated in recent years.The water saving potential of artificial recharge during the sustainable development and construction of the city and the prospect of development in the future are expounded.

  18. 宁夏农村面源污染现状调查分析结果初报%Preliminary Report on Investigation and Analysis Result of Current Situation of Rural Non-point Source Pol ution in Ningxia

    Institute of Scientific and Technical Information of China (English)

    杨晓娟; 靳军良; 王金保

    2014-01-01

    通过调查监测,宁夏农村面源污染的主要来源集中体现在化肥污染、农药污染、畜禽粪便污染、农膜污染及农村生活污染5个方面,但其影响和污染主要表现在对水环境和土壤环境的污染上。其中,对水环境的污染形式则是通过地表径流和地下淋溶把过剩的氮、磷、有机农药、无机盐等带到地表水和地下水中,致使地表水富营养化,破环水生态环境,鱼虾难以生存。对土壤环境的污染形式是通过农业投入品超量施入,在改变土壤物理性状、破环土壤通透性、造成土壤板结、粘结的同时,造成重金属离子和病原菌的积累,给农产品质量安全带来危害。%Based on an investigation and monitoring,the main sources of Ningxia rural non-point source pollution includes the five aspects of chemical fertilizer pollution, pesticide pollution, livestock and poultry manure pollution, agricultural plastic film pollution and rural domestic pollution. But the impact and pollution were mainly manifested in the pollution of water envi-ronment and soil environment. The form of pollution of the water environment was bringing excess nitrogen, phosphorus, or-ganic pesticides and inorganic salt to the surface water and underground water by the surface runoff and underground leach-ing,it caused the surface water eutrophication,the destruction of the aquatic ecological environment and made the fish and shrimp hard to survive. The form of pollution of the soil environment was changing the soil physical characteristic, destroying the soil permeability, causing soil compaction and bond,and causing the accumulation of heavy metal ions and pathogenic bacteria by excessive application of agricultural inputs, and it brought harms to the quality and safety of agricultural products.

  19. 高职计算机类专业校企合作现状调查报告%Investigation Report of Current Situation of College-enterprise Cooperation of Computer Specialties in Higher Vocational Colleges

    Institute of Scientific and Technical Information of China (English)

    刘君; 刘艳芳; 王志勇

    2016-01-01

    An investigation has been launched toward 16 higher vocational colleges and 128 enterprises in Shandong province to find out the situation and the facing problems in college-enterprise cooperation of computer specialties in higher vocational colleges. It is found that higher vocational colleges has been fully realized the important role of university-enterprise cooperation, but because of the nature of the computer specialty determines the students in the process of participating in university-enterprise cooperation as a post is simpler and the single university-enterprise cooperation content is not widely. To further promote university-enterprise cooperation, the effective strategies are to play a leading role of the government to establish and improve the benefit coordination mechanism between university and enterprise, improve the ability of higher vocational colleges in the cooperation with enterprise, and cultivate higher vocational college students’good professional ethics, and university-enterprise cooperation signed confidentiality agreement.%以山东省16所高职院校和128家企业为调研对象,调查目前高职院校计算机类专业校企合作的基本情况以及面临的主要问题。调查表明,高职院校已经充分认识到校企合作的重要作用,但是由于计算机类专业的性质决定了学生在参与校企合作过程中担任的岗位比较简单和单一,校企合作的内容不广泛。进一步促进校企合作的有效策略是:政府发挥主导作用,建立健全校企合作主体之间的利益协调机制;提高高职院校进行校企合作的基础能力;培养高职院校学生良好的职业道德,校企合作签订保密协议。

  20. Investigation and Analysis on Current Situation of Extracurricular Physical Training of College Students in Mountain Area%山区高校学生课外体育活动现状调查与分析

    Institute of Scientific and Technical Information of China (English)

    林宁

    2015-01-01

    随着社会经济和信息化程度不断发展,相当一部份学生业余生活都在宿舍中渡过,手机与电脑游戏成为他们业余生活的全部,不仅降低了身体素质、影响了视力,而且荒废学业. 从福建水利电力职业技术学院、三明学院、三明职业技术学院中随机抽取600 名学生作为调查对象,通过问卷调查,对三所高校学生参加课外体育活动状况进行调查分析. 结果表明:学生参加课外体育锻炼的目的比较明确,认知态度尚好,但每周参加课外活动的次数和持续时间长短不尽人意,尤其是女学生,大多数学生对"健康第一、终身体育、阳光体育"理解不够深入. 为了更好地指导学生合理参与课外体育活动提出建议与对策.%With the increasing development of social economy and informationization degree, quite a few students spend their time in the dormitory after class and are addicted to playing mobile phones and comput-er games, which not only do harm to their physical quality and eyesight, but also makes them neglect their studies. 600 college students are randomly selected from the Fujian College of Water Conservancy and Elec-tric Power, Sanming University, Sanming Vocational Technical College as the objects of the study. Students ' participations in extracurricular physical training of the three colleges are investigated and analyzed by questionnaires. The results show that the students' extracurricular physical training purpose is clear and cog-nitive attitude is good, but weekly training times and duration is unsatisfactory, especially female students. Most of the students have not a deep understanding in "Health first, Lifelong sports, Sunshine sports". Therefore, some suggestions and countermeasures are put forward in order to provide a better guide for col-lege students to take part in extracurricular physical training.

  1. 新疆高师院校自然科学学报发展现状调查研究%The Investigation and Study on Current Situation of Natural Science Journal in Normal Colleges and University of Xinjiang

    Institute of Scientific and Technical Information of China (English)

    张建国

    2015-01-01

    通过对新疆三所高师院校自然科学版学报载文篇数、作者年龄分布、职称分布、学历分布、刊发文章基金项目情况、内外稿比例等情况调查分析,发现三家学报载文符合科技期刊的载文标准,载文长度呈增长趋势;内稿占多数;三所高校学报的项目成果论文都比较多,并且有逐年增多的趋势;载文作者相对年轻,有相当数量的在读研究生和初级职称作者,中青年中级和副高职称作者是各家学报的主力军。针对发现的问题,高校学报应下大力气建设高水平稳定的作者群,积极应对学术不端行为,加强学报编辑部建设,进一步提高高校学报的办刊质量。%Through the investigation on natural science papers number, distribution of authors’ title, age, ed⁃ucation background , fund program of published articles and the proportion of papers in both inside and outside in the Journal of Xinjiang three normal universities, we have found the papers conform to standards of scientific jour⁃nals, the papers show a tendency to increase in length; most of them are majority; the papers of project achieve⁃ment are more and more, and has the trend of increasing year by year;the authors with papers are relatively young, some of whom are graduate students and junior title. Middle-aged and high title authors are the main force in the journal. According to some problems, journals of colleges and universities should make great efforts to build a high level stable author groups, coping behavior of academic misconduct positively, strengthening construction of the ed⁃itorial office, further improving the quality of the publication of journals of colleges and universities.

  2. Investigate of Current Situation of Landscape Plants Applied in Taiyuan City%太原市城区园林植物应用现状调查与分析

    Institute of Scientific and Technical Information of China (English)

    付宝春; 李志娟; 刘琛彬; 薄伟; 王松

    2013-01-01

    The application status of garden plants in Taiyuan city were investigated and assessed in this paper.The results showed that the species applied in the urban mainly concentrated in Rosaceae,Compositae,Oleaceae,Leguminosae,Liliaceae family etc.,accounting for 39.8% of the total number of garden plants.In all investigated garden plants,trees and shrubs had more species and individuals than the others,dominated by deciduous plants,which is 85.1%.From species source,the introduce species have larger proportion,and the indigenous plants disadvantage of narrow application,respectvely,accounting for 56.9% and 43.1% of the total species.The plantation structure of tree+shrub,tree+herb application scope is the broadest in vertical structure of the plant community,the two patterns account for 75% of total application area.As far as different garden green land is concemned,the garden plant species,quantities and the types of vertical structure of the plant community at park green belt and high-grade residential area are the most,nest is new main road greenbelt,the old residential area and old street green belt are the least.At the mean time,It is concluded by analysis that we shouldn't only enrich the landscape plant species and quantities in Taiyuan urban grcen land construction,but also pay attention toplants rational arrangement,strengthening vegetation coverage of land surface and greening scale of vertical plane,increasing colored-leaf trees planting proportion,making good use of indigenous plants resources,and introduce excellent exotic species reasonably.%对太原市城区园林植物应用现状进行调查分析.结果表明,城区园林绿化植物物种主要集中在蔷薇科(Rosaceae)、菊科(Compositae)、木犀科(Oleaceae)、豆科(Leguminosae)、杨柳科(Salicaceae)、百合科(Lili-aceae)等,占本次调查植物总数的39.8%;乔灌木种类数量最多,其中以落叶树种为主,占乔灌木总数的85.1%;物种来源方面,引进物

  3. The current investigation of smoking behavior and cognition among floating population in Xi’an%西安市流动人口吸烟行为及认知的现况调查

    Institute of Scientific and Technical Information of China (English)

    王明奇; 杜峰莉

    2014-01-01

    Objective To understand smoking behavior and cognitive status of the floating population,so as to provide theoretical basis for further tobacco control intervention.Methods An unified questionnaire survey was conducted among 1 222 floating population.Then we described its smoking and cognitive status,and analysised smoking,quit smoking,cognitive among different characteristics of people.Results Smoking rates of Xi’an float-ing population was 43.9%.Males was significantly better than female (P<0.01).Smoking rates had statistical difference among different age,different cultural level,different types of housing,whether living alone in the lo-cal,working hours every day and whether to change shifs (P<0 .0 5 ).The current smoking rate was 1 5 .2%.The rate of exposuring to second-hand smoke was 82.6%.4.0% and 9.5% of the respondents knew the dangers of smoking and second-hand smoke.Awarenesses of smoking hazards of people of different educational levels were sta-tistically significant(P<0 .0 5 ).Awarenesses of second-hand smoking hazards of people of different educational lev-els,smoking behavior,gender,were statistically significant(P<0.05).Different smoking people’s attitude toward smoking related views was statistically significant(P<0.05).Conclution Xi’an floating population have high smoking rates and low cognitive level.We should implement tobacco control intervention according to the character-istics of floating population to reduce the tobacco harm to their health.%目的:了解西安市流动人口吸烟行为及认知现状,为进一步的控烟干预提供理论依据。方法对西安市1222名流动人口进行统一的问卷调查,描述其吸烟及认知现状,并对不同特征人群吸烟及认知情况进行比较分析。结果西安市流动人口吸烟率为43.9%,男性明显高于女性(P<0.01);不同年龄、不同文化程度、不同住房类型、当地是否单独生活、每天工作时间和是

  4. 四川大学本科生《卫生统计学》实践教学现状调查%INVESTIGATION ON THE CURRENT SITUATION OF PRACTICAL TEACHING ON HEALTH STATISTICS IN THE UNDERGRADUATES OF SICHUAN UNIVERSITY

    Institute of Scientific and Technical Information of China (English)

    冯虹; 李鸿; 姚科; 朱彩蓉

    2011-01-01

    [Objective] To evaluate the current situation of practical teaching on Health Statistics in the undergraduates of Sichuan University, and to explore the influencing factors on the effectiveness of practical teaching, and to find the clue to improve the quality of teaching. [Methods] All the undergraduate students who took the course- Health Statistics in 2010 spring semester were surveyed by the self-designed questionnaire. Cumulative odds logistic regression for ordinal response was used to analyze the risk factors of the effectiveness of practical teaching. [Results] Total 417 students in 6 different majors accepted the survey. The response rate was about 97%. There were only 67.7% students acknowledged the teaching progress was appropriate. Only 54.1% of the students considered the practical courses were closely connected with theoretical course. And only 31.4% of the students said that they could leam a lot after the experimental courses. Unfortunately, the percentage of students dissatisfied with the hardware conditions in our computer labs was about 54.7%. Majors, hardware conditions in the computer labs, the connection degree between the practical and theoretical classes, the teaching level, and the course difficulty were considered to be the influencing factors on the teaching effectiveness. [Conclusion] Hardware conditions in our computer labs need to be improved. And there are several suggestions for teachers to improve the students' ability in practical application as follows. Teachers can help students form a systematic thinking through the practical teaching with combination of professional features and case study. And teachers should focus on the interpretation of the outcomes and operation of the statistical software simultaneously. Besides, students can be divided into small groups, discussing and communicating with each other makes they can have a better understanding of the knowledge.%[目的]了解四川大学医学本科生《卫生统计学》

  5. 职业学校医学生学习动机的现状调查与研究%Investigation and research on the current situation of learning motivation of medical students in vocational schools

    Institute of Scientific and Technical Information of China (English)

    徐文兰; 张阳

    2016-01-01

    目的:为了解初中起点的职业学校医学生的学习动机和学习心理,为提高学生学习积极性提供依据,针对性采取改进措施。方法采用按专业、年级进行分层整群抽样,抽取阜阳市两所职业学校的1031名在校医学生进行调查,问卷使用黄希庭编制的学习动机问卷量表。结果学习动机内容得分从高到低依次为物质追求、小群体取向、求知进取、社会取向、个人成就、害怕失败;男生在害怕失败方面和女生具有显著差异性;中专学生求知进取动机和大专学生具有显著差异性;个人成就同年级分布具有差异,四年级各项得分均处于最高水平。结论职业学校学生学习动机更注重物质追求,满足生理需要为基础;求知进取动机不足,维持学习的动机水平较弱;对校纪校规的约束动机较弱。故应从纠正学生学习动机出发,找出对策,提高学生学习积极性。%Objective To understand the learning motivation and psychology of vocational school students started from junior high school, and to provide the basis for improving students'learning motivation, and to take measures to improve the students'learning motivation.Methods Using stratified cluster sampling method to sampling 1031 medicos from two vocational schools in Fuyang City according to specialty and grade.A questionnaire compiled by Huang Xiting was used to investigate learning motivation.Results The score of different aspects of learning motivation from high to low were material pursuit, small group orientation, learning enterprising, social orientation, personal achievement, fear of failure sequentially.The fear of failure between boys and girls has significant difference.Learning motivation between secondary school students and college students has significant difference.The distribution of personal achievement in the same grade was different. Students on the fourth grade are in the highest

  6. 洛阳市农村孕产妇卫生保健现状的调查与分析%Current Investigation Situation on Rural Maternal Health Care in Luoyang

    Institute of Scientific and Technical Information of China (English)

    李云霞

    2016-01-01

    目的:了解影响农村孕产妇卫生保健的因素,为制定干预措施降低我市孕产妇死亡率提供依据。方法对洛阳市152所乡镇卫生院孕产妇系统管理及转诊情况等进行调查,查看孕产妇保健手册登记内容,检查乡、村两级妇幼保健医生的孕产妇系统管理卡、册,特别是死亡孕产妇的保健情况,分析孕产妇死亡监测资料。结果洛阳市152所乡镇卫生院孕产妇年检人数(95731±11560)人,孕产妇年龄19~42岁;农村孕产妇死亡人数为66例,孕产妇死亡地点在县医院及乡卫生院占77.27%(51/66);家中和途中占22.73%(15/66例);洛阳市农村孕产妇死亡率2011年至2014年在逐渐增高,均高于洛阳市区的孕产妇死亡率。孕产妇文化程度、家庭环境、孕期保健的重视程度与孕产妇死亡率有关。结论应加强农村孕产妇的系统管理,提高住院分娩率,畅通危急孕产妇抢救网络,有效降低高危因素,降低孕产妇死亡率和围产儿死亡率。%Objective To understand the various factors effecting the rural maternal health care in order to strengthen the management of rural pregnant women and provide the interventions to reduce maternal mortality. Methods 152 township hospitals were investigated by maternal health care management system, which included to check the manual content of maternal health care registration and the two level of township and village health center maternal and child health care registration, especially the case of death. Results There was annual number (95 731 ±1 1 560)of pregnant women who were 19 to 42 years old in 152 township hospital of Luoyang city.The rural maternal death were 66 cases died in county hospitals and township health hospital (77.27%,5 1 /66)and death in home or on the way (22.73%,15 /66).The rural maternal mortality rate was increased in Luoyang from 201 1 to 2014,and it was higher than that in city

  7. 湘西地区城镇居民体育锻炼现状调查与分析%Investigation and Analysis of the Current Situation of Sports Exercises of Urban Residents in the West of Hunan Province

    Institute of Scientific and Technical Information of China (English)

    石红

    2014-01-01

    采用文献资料法、访谈法、问卷调查法、数理统计法等研究方法,随机抽取湘西地区吉首、凤凰、花垣、保靖4个城镇1200名居民为调查对象,从体育锻炼参与者基本特征、体育锻炼动机、时间、频率、强度等方面进行调查与分析,研究结果表明:在参加体育锻炼的居民中,女性所占的比例高于男性,中老年人占多数,参加体育锻炼的主要动机是健美体形,减肥、愉悦身心,缓解压力和娱乐。每周参加3-5次锻炼,每次锻炼的持续时间在30-60分钟,以中等强度为主的人数比例最高,大多数居民以广场、公园、单位或住宅小区体育场所作为锻炼场所,选择体育锻炼的项目主要为户外健身器械、健身走、登山,选择与朋友、同事一起锻炼的形式较多,影响居民参加体育锻炼的主要因素是缺乏时间、缺乏场地设施和没兴趣。%By using the methods of literature, expert interview and questionnaire,the article has randomly selected 1200 urban residents as the research objects from Jishou, Fenghuang, Huayuan, Baojing of the West of Hunan Province, investigated and analyzed the basic characteristics of participants, physical exercise motivation, time, frequency, intensity. The results show that: in the exercise of the residents, the proportion of women is higher than men, the elderly accounts for the majority, the main motivation to participate in the sports exercises is to fit shape, weight loss, mental and physical pleasure, ease the pressure and entertainment. The frequency of them most is 3-5 times every week, the duration of each exercise is in 30-60 minutes, most of their exercises are with medium intensity, most residents in the square, park, units or residential area sports venues as places for exercises, most choose to do outdoor fitness equipment exercises, fitness walking, climbing, most select the form of doing with friends or colleagues, the

  8. Investigation analysis of current exercise status and its obstacle factors in patients with cancer-related fatigue%癌因性疲乏患者运动现状及障碍因素的调查分析

    Institute of Scientific and Technical Information of China (English)

    王晓庆; 段培蓓; 杨丽华; 梅思娟

    2015-01-01

    目的 了解患有癌因性疲乏的胃肠道肿瘤患者的运动情况,分析其障碍因素,为临床护理工作提供依据. 方法 采用自行设计的一般资料调查问卷及肿瘤患者运动障碍问卷对江苏省中医院消化肿瘤外科的216例胃肠道肿瘤并具有不同程度癌因性疲乏的患者进行问卷调查. 结果 216例患者中有155例进行运动,但只有66例运动强度达到了美国肿瘤学会2012年发布的运动指南推荐的标准."不知道运动能够减轻疲乏程度""害怕运动对疾病及治疗带来负面影响""疲乏""缺乏运动技能"及"无运动习惯"等是影响癌因性疲乏患者实施运动疗法的主要障碍因素. 结论 医护人员应意识到癌因性疲乏对肿瘤患者生活质量的严重影响,规范化评估和管理疲乏,进行睡眠干预和行为指导,科学地评价疲乏的管理效果.%Objective To probe into the exercise status of digestive tumor patients in cancer-related fatigue, analyze its obstacle factors, in order to provide evidence for clinical nursing care. Methods Self designed general information questionnaire and tumor patient′s cinesipathy questionnaire in 216 digestive tumor patients of Digestive Tumor Surgery Department in Jiangsu Chinese Medicine Hospital for investigation of different degree cancer-related fatigue. Results A total of 155 of 216 patients had excises, but 66 cases reached the excises intensity of American Cancer Society in 2012 published guidelines recommend movement standards;"do not know that exercise can reduce fatigue degree", "fear campaign negative impact on disease and treatment","tired", "lack of motor skills" and "no exercise habits" were the obstacle factors for cancer-related fatigue carrying out exercise therapy. Conclusions Medical personnel should be aware of the impact of cancer-related fatigue on the quality of life in the cancer patients, regulate assessment and manage fatigue, carry out sleep interventions and guide

  9. 云霄县土源性寄生虫感染现状调查%Investigation on current status of infections of soil-borne nematodes in Yunxiao County

    Institute of Scientific and Technical Information of China (English)

    吴文勇; 许国防; 林茶枝; 陈舜君; 陈建山

    2013-01-01

    目的 了解云霄县土源性线虫感染现状及分布特点,为制定土源性寄生虫病防治策略提供参考依据.方法 采取分层整群随机抽样法选择调查对象,采用Kato-Katz法检查蛔虫、钩虫和鞭虫感染,透明胶纸肛拭法检查儿童蛲虫感染情况,以问卷形式记录调查对象的性别、年龄、受教育程度以及相关流行因素.结果 全县共调查4个镇21个村2 002人,查出土源性线虫感染169人,感染率为8.44%.钩虫、鞭虫和蛔虫感染率分别为4.35%、1.70%和0.15%,儿童蛲虫感染率为13.48%(43/319);7岁以下和45岁以上人群感染率较高,女性感染率高于男性,感染率随文化程度升高而降低.结论 云霄县人群土源性线虫感染率呈下降趋势,但在以种植经济作物为主的乡村钩虫感染率仍然较高;儿童蛲虫感染率仍处于较高水平,应引起重视.%Objective To understand the endemic situation of soil-borne nematodes and their distribution characteristics, so as to provide the evidence for formulating prevention strategy. Methods According to The Survey Program of Important Human Parasitic Diseases in Fujian Province, the survey spots were determined by the stratified cluster randomly sampling method. The eggs of Ascaris lumbricoides, hookworm and Trichuris trichiura in feces were detected by Kato-Katz technique; the eggs of Enterobi-us vermicularis were checked by rectal swabs using transparent adhesive tape. A questionnaire survey was performed for recording the gender, age, education levels and related epidemiological factors. Results Altogether 2002 residents in 21 villages of 4 towns were investigated. There were 169 residents infected with soil-borne nematodes (8.44%). The infection rates of hookworm, Trichuris trichiura and Ascaris lumbricoides were 4.35%, 1.70% and 0.15% respectively. The infection rate of Enterobius vermwu-laris was 13.48% (43/319) in children. The infection rates of soil-borne nematodes were

  10. 重庆沙坪坝区土源性线虫感染现况调查%Investigation on the Current Situation of Human Soil-borne Nematode Infection in Shapingba District of Chongqing

    Institute of Scientific and Technical Information of China (English)

    刘虹宏; 杨连建; 陈敏; 李廷荣; 陈音汁

    2013-01-01

    2009年12月~2010年2月采用分层随机整群抽样法,按重庆沙坪坝区东南西北4个方位,随机抽取2个街道和2个乡镇,按《全国人体重要寄生虫病现状调查实施细则》开展调查.采用改良加藤厚涂片法检查12周岁以上常住居民肠道土源性线虫感染情况,以透明胶纸肛拭法检查12周岁及以下儿童蛲虫感染情况.共检查2 121人,感染率为9.6% (203/2 121),其中钩虫、蛔虫和鞭虫的感染率分别为9.3% (197/2 121)、0.4% (8/2 121)和0.1%(2/2 121),均以轻度感染为主;年龄组50岁以上感染率最高,为15.5% (160/1 030);职业以农民感染率最高,为22.3% (113/506);文化程度越高,感染率越低(P<0.01).城市人口感染率(2.1%)远低于农村人口感染率(17.3%)(x2=140.443 5,P<0.01).提示重庆市沙坪坝区人群中土源性线虫的感染率远低于Ⅱ类地区标准,且以钩虫感染为主.%By stratified cluster sampling method, 2 urban and 2 rural fields were selected from Shapingba district of Chongqing for survey in December 2009 to February 2010. According to the Administrating Regulations of National Investigation on Important Human Parasitic Diseases, Kato-Katz method was used to examine human intestinal soil-borne nematode eggs, and adhesive cellophane anal swab method was applied to examine Enterobius infection for children under 12 years old. 203 cases were found positive in 2121 subjects, with an infection rate of 9.6%(203/2 121), and the infection rate of hookworms, Ascaris lumbricoides and Trichuris trichiura with mild infection mostly was 9.3% (197/2 121), 0.4% (8/2 121) and 0.1%(2/2 121), respectively. The rate among people over 50 years old was 15.5% (160/1 030), and the fanners was with 22.3%( 113/506). The higher the education level, the lower the infection rate(P<0.01), and there was a significant difference in the prevalence between ruban (2.1%) and rural people (17.3%) (x2=140.443 5, P<0.01). The infection rate of soil

  11. Investigation on the Current Status of Radiotherapy in Xinjiang Uygur Autonomous Region%新疆维吾尔自治区放射治疗现状调查

    Institute of Scientific and Technical Information of China (English)

    齐洪志; 晓开提·依不拉音

    2014-01-01

    目的:掌握新疆维吾尔自治区放射治疗机构基本情况,分析放射治疗机构发展趋势,为合理利用放射医疗资源及地区分布提供参考依据。方法对新疆维吾尔自治区现有的21家放射治疗单位进行电话、问卷方式调查,总结分析我区放射治疗机构设备配置、人员构成、业务开展情况。结果截止到2012年12月,全疆共有放疗单位21个,从事放射治疗的工作人员共296位(不包含护士)。放射治疗设备中医用电子直线加速器27台,X模拟定位机19台,大孔径CT模拟定位机3台,近距离后装治疗机5台,放射治疗计划系统18台,剂量仪23台,X刀5台,γ刀3台。结论新疆维吾尔自治区放射治疗进入了高速发展阶段,放射治疗技术的应用从满足基本治疗需求到高、精、尖领域全覆盖,放射治疗工作人员队伍不断壮大,并且更加专业化。急需建立全区统一的放射治疗质量控制和质量保证管理体系,切实监督执行,以规范对肿瘤患者的放射治疗,保证放疗质量。%Objective To master the basic situation of Xinjiang Uygur Autonomous Region radiotherapy institutions, analysis of development for radiation therapy facilities and provide a reference to rational use of medical resources and geographical distribution. Methods Use phone cal s and questionnaires to investigate 21 radiotherapy units in Xinjiang Uygur Autonomous Region ,analyzed the device configuration, composition of the staf and the capability of radiation therapy. Results By the end of December 2012, there are 21 radiotherapy units in Xinjiang, have 296 (not included nurses) staf of the radiotherapy. There are 27 linear accelerators of electron , Radiation therapy equipment 19 X-ray simulators, 3 large aperture CT simulators, 5 close brachytherapy machines, 18 radiation treatment planning system, 23 dosimeters, 5 X-knife, 3 γ-knife. Conclusion Radiotherapy in Xinjiang Uygur

  12. 护理实习生多元文化护理认知现状调查及分析%Investigation and analysis on nurse intern's cognition for the current situation of multi-culture nursing

    Institute of Scientific and Technical Information of China (English)

    彭幼清; 樊琪; 张晓莉; 马素芳; 陈旻

    2010-01-01

    目的 了解上海浦东新区护理实习生多元文化护理的认知水平及相关因素,为多元文化护理培训课题的设置提供依据及管理建议.方法 采用"护士多元文化护理问卷"(四个维度)进行认知调查,对浦东3所综合性教学医院全体护理实习生共305名在同一时间段内进行调查.结果 护理实习生多元文化护理认知总体得分为(104.99±9.41)分,其中知识理论维度得分最低为(25.84±6.53)分;87.9%护生不知道"朝阳模式";总体及格率为36%,良好率及优秀率为0;护生认知水平低于同一区域临床护士的认知水平(P<0.01);本科及专科护生对宗教风俗的认知水平显著高于中专护生(P<0.05);护生每日学习时间≥3h者总体认知水平显著高于≤2 h者(P<0.01);95%~99%护生认为,影响认知水平的主要因素有:①学校没有要求过;②没有培训过;③不知道有此内容.结论 浦东新区护理实习生多元文护理认知水平亟待提高,必须采取果断措施加强教育培训与教学管理.%Objective To acquaint nursing interns ' cognition level and correlative factors for multiculture nursing in Shanghai Pudong new district, provide evidence and proposal for setting the subject of multiculture nursing training. Methods 305 nursing interns in three general hospitals in Pudong new district were investigated for the cognition simultaneously by using" multi-culture nursing questionnaire" (four dimensions).Results The total points was (104.99 ± 9.41), the dimension of theory got the lowest mark(25.84 ± 6.53),87.9 percent interns did not know "chaoyang mode"; the pass rate was only 36 percent, the good and distinguished achiever ratio was 0, the interns'cognition level was lower than clinical nurses'in the same region.The cognition levels of undergraduates and junior college students for religious customs were higher than secondary specialized interns' (P<0.05). The cognition level of interns whose learning time more

  13. 连云港市医疗机构放射诊疗防护现状调查与分析%Investigation and analysis of current situations of radiological protection in medical institutions of Liangyungang City

    Institute of Scientific and Technical Information of China (English)

    罗贤标; 孙芹; 靳光付; 高蓉

    2016-01-01

    目的 对连云港市医疗机构的放射诊疗防护工作情况进行断面调查和研究,探索防护重点和影响因素.方法 通过问卷调查的方式对2014年全市医疗机构进行普查,通过整群抽样的方式对放射诊疗患者进行问卷调查.数据经逻辑检错、清理后,采用Epidata 3.0进行数据录入,调查数据采用SPSS 13.0软件进行统计学分析.结果 一级、二级、三级医疗机构放射诊疗设备检测率分别为87.7%、98.0%、100%,配套的防护设备配备率分别为80.2%、96.1%、100%,放射诊疗工作人员上岗前培训率分别为87.6%、96.9%、100%,个人剂量监测率分别为67.4%、93.8%、98.4%,健康档案建档率分别为62.8%、90.7%、100%.结论 基层医疗机构放射诊疗防护有待加强,患者放射诊疗自我保护意识不强.%Objective To explore the protective focus and influencing factors through a cross-sectional investigating radiological diagnosis and treatment protection of medical institutions in Lianyungang. Methods A cluster sampling questionnaire survey was conducted in patients with radiation therapy in all medical institutions of the city.Results detection rates of radiological diagnosis and treatment equipment in Primary,secondary,tertiary medical institutions were 87.7%、98.0% and 100% respectively,The rate matched with protective equipment set were 80.2%、96.1% and 100% respectively.Training rates of radiological diagnosis staff before taking up the work were 87.6%、96.9% and 100% respectively.Personal dose monitoring rates were 67.4%、93.8% and 98.4% respectively,Health records'rates were 62.8%, 90.7% and 100% respectively.Conclusions Radiological diagnosis and protection in primary medical institutions need to be strengthened,and self-protective consciousness to radiological diagnosis and treatment in patients is weak too.

  14. Current measurement apparatus

    Science.gov (United States)

    Umans, Stephen D.

    2008-11-11

    Apparatus and methods are provided for a system for measurement of a current in a conductor such that the conductor current may be momentarily directed to a current measurement element in order to maintain proper current without significantly increasing an amount of power dissipation attributable to the current measurement element or adding resistance to assist in current measurement. The apparatus and methods described herein are useful in superconducting circuits where it is necessary to monitor current carried by the superconducting elements while minimizing the effects of power dissipation attributable to the current measurement element.

  15. Approaches to Grammar Instruction in Teaching Materials: A Study in Current L2 Beginning-Level Spanish Textbooks

    Science.gov (United States)

    Fernandez, Claudia

    2011-01-01

    This study explores how grammar instruction is conceptualized and applied in published Spanish materials. It sought to answer the following questions: What are the approaches to grammar instruction in current, college-level, beginning Spanish textbooks? How do they reflect current perspectives on grammar teaching? Six widely adopted Spanish…

  16. Approaches to Grammar Instruction in Teaching Materials: A Study in Current L2 Beginning-Level Spanish Textbooks

    Science.gov (United States)

    Fernandez, Claudia

    2011-01-01

    This study explores how grammar instruction is conceptualized and applied in published Spanish materials. It sought to answer the following questions: What are the approaches to grammar instruction in current, college-level, beginning Spanish textbooks? How do they reflect current perspectives on grammar teaching? Six widely adopted Spanish…

  17. 贵阳市终末期肾病维持血液透析患者现况调查%Current status investigation of maintenance hemodialysis patients with end stage renal disease in Guiyang

    Institute of Scientific and Technical Information of China (English)

    袁静; 吴龙; 查艳; 林鑫; 杨霞; 何珊; 熊鸿燕

    2013-01-01

    anemia,renal osteodystrophy,secondary hyperparathyroidism and other complications of treatment were analyzed and the health insurance models and health care costs of patients were investigated.Results Among 756 cases of ESRD hemodialysis patients in Guiyang during 2011-2012,male to female ratio was 1.4:l,the average age (49.1±14.7) years, educational level of college and tertiary education 135 cases (17.9%).The top five disease etiologies were chronic glomerular nephritis(407 cases, 53.8% ),diabetic nephropathy (132 cases,17.5%) , hypertensive renal injury(124 cases, 16.4%) , polycystic kidney disease(28 cases, 3.7% ), drug-induced renal damage(13 cases, 1.7% ) ;as for vascular access, internal arteriovenous fistula was 466 cases (61.6%), internal jugular vein catheter 243 cases (32.1% long-term), fistula grafts 33 cases (4.4% ), direct puncture 12 cases (1.6%),stock vein catheter 2 cases (0.3% long-term).271 cases (35.9%) were up to Hb target,747 cases (98.8%) used erythropoietin(EPO) ,only 273 cases (36.1%) used iron,and 364 cases (48.2%) used folic acid to treat renal anemia.354 cases(46.8%) were up to phosphorus standard and 123 cases (16.3%) to intact parathyroid hormone standard.The average monthly total medical costs were RMB (6 072.6±3 381.1) yuan.Various medical insurances were the main health insurance model,full fee-paying patients accounted for only 2.9%.Conclusion The main primary disease of ESRD is chronic glomerulonephritis and the main vascular access of maintenance hemodialysis patients is internal arteriovenous fistula in Guiyang. Complications of renal anemia, hyperphosphatemia, secondary hyperparathyroidism are low standard rate.The treatment and specification need to be strengthened.

  18. 江西省2009年燃煤污染型氟中毒病区现状调查%Investigation of the current situation in coal-burning endemic fluorosis areas of Jiangxi province in 2009

    Institute of Scientific and Technical Information of China (English)

    熊小玲; 刘玮; 李志宏; 万建平; 裘海清; 陈都; 上官俊

    2013-01-01

    OBJECTIVE To find out the prevalence and distrbution of endemic fluorosis in coal-burning pollution areas,provide the basis for formulating prevention and control measures.METHODS An administrative village for the unit,the population,households and dental fluorosis in children aged from 8 to 12 years were surveyed generally in study areas.During the investigation,sampling test of fluoride levels in drinking water and urine of children were carried out and the prevalent factors were surveyed in epidemic fluorosis villages where the prevalence of children's dental fluorosis was over 30%.RESULTS In this survey,the number of children aged from 8 to 12 years was 218 763,the number of children with dental fluorosis was 25 899,the prevalence of children's dental fluorosis was 11.84%.The conditions of dental fluorosis gave priority to extremely light and mild; the ratios were 49.56% and 43.62% respectively.The number of epidemic fluorosis villages where the prevalence of children dental fluorosis over 30% was 371,accounting for 24.25% of the total survey villages,and the epidemic fluorosis villages where the prevalence of children dental fluorosis over 30% weren't found only in Fengcheng city.2 588 children's urine samples and 346 resident drinking water samples were collected,the geometric mean of fluoride concentration in urine was 0.87 mg/L,and its scopes were 0.10 mg/L to 10.44 mg/L.The number of villages where the geometric mean of fluoride concentration in urine over 1.40 mg/L was 13,accounting for 14.94%.The fluoride concentrations in resident drinking water were from 0.01 mg/L to 0.92 mg/L,the mean was 0.15 mg/L,the fluoride concentration in all samples were under the sanitary standard for drinking water.The percentage of houses with masonry structure was 95.85% of total survey households,97.39% of the residents still used coal as the main fuel,98.75% of the residents in coal-burning households used open burn ovens,the percentage of households

  19. Saturn's Other Ring Current

    Science.gov (United States)

    Crary, F. J.

    2014-04-01

    Saturn's main rings orbit the planet within an atmosphere and ionosphere of water, oxygen and hydrogen, produced by meteoritic impacts on and ultraviolet photodesorbtion of the ring particles [Johnson et al., 2006; Luhmann et al., 2006; Tseng et al., 2010]. The neutral atmosphere itself has only been tentatively detected through ultraviolet fluorescents of OH [Hall et al., 1996] while the ionosphere was observed in situ by the Cassini spacecraft shortly after orbital insertion [Coates et al.,2005; Tokar et al. 2005, Waite et al. 2005]. Although the plasma flow velocity of this ionosphere is not well-constrained, but the close association with the rings suggests that its speed would be couppled to the keplarian velocity of the rings themselves. As a result, the motion of the plasma through Saturn's magnetic field would produce an induced voltage, oriented away from the planet outside synchronous orbit and towards the planet inside synchronous orbit. Such a potential could result in currents flowing across the ring plane and closeing along magnetic field lines and through Saturn's ionosphere at latitudes between 36o and 48o. Cassini observations of whistler-mode plasma wave emissions [Xin et al.,2006] centered on synchronous orbit (1.76 Rs, mapping to 41o latitude) have been interpreted as a product of field-aligned electron beams associated with such a current. This presentation will investigate the magnitude of these currents and the resulting Joule heating of the ionosphere. An important constraint is that no auroral ultraviolet emissions have been observed at the relevant latitudes. In contrast, Joule heating could affect infrared emissions from H3+. Variations in H3+ emission associated with Saturn's rings have been reported by O'Donoghue et al., 2013, and interpreted as a result of ring "rain", i.e. precipitating water group species from the rings which alter ionosphereic chemistry and H3+ densities. As noted by O'Donoghue et al., this interpretation may be

  20. "Nobody Told Us about What Happened": The Current State of Holocaust Education in Romania

    Science.gov (United States)

    Misco, Tomas

    2008-01-01

    This research study sought to understand the current state of Holocaust education in Romanian classrooms and how sociocultural and institutional forces influence its treatment. By identifying the obstacles, challenges, and successes of Holocaust education in Romania, this study can both disseminate the techniques and conditions that bring about…

  1. Subcortical structures in humans can be facilitated by transcranial direct current stimulation

    NARCIS (Netherlands)

    Nonnekes, J.H.; Arrogi, A.; Munneke, M.A.M; Asseldonk, E.H. van; Nijhuis, L.B.; Geurts, A.C.H.; Weerdesteyn, V.G.M.

    2014-01-01

    Transcranial direct current stimulation (tDCS) is a noninvasive brain stimulation technique that alters cortical excitability. Interestingly, in recent animal studies facilitatory effects of tDCS have also been observed on subcortical structures. Here, we sought to provide evidence for the potential

  2. Subcortical Structures in Humans Can Be Facilitated by Transcranial Direct Current Stimulation

    NARCIS (Netherlands)

    Nonnekes, J.H.; Arrogi, A.; Munneke, M.A.M.; Asseldonk, van E.H.F.; Oude Nijhuis, L.B.; Geurts, A.C.; Weerdesteyn, V.

    2014-01-01

    Transcranial direct current stimulation (tDCS) is a noninvasive brain stimulation technique that alters cortical excitability. Interestingly, in recent animal studies facilitatory effects of tDCS have also been observed on subcortical structures. Here, we sought to provide evidence for the potential

  3. Encouraging Civic Knowledge and Engagement: Exploring Current Events through a Psychological Lens

    Science.gov (United States)

    Van Camp, Debbie; Baugh, Stacey-Ann

    2016-01-01

    Engagement with political, social, and civil issues is a fundamental component of an educated population, but civic knowledge and engagement are decreasing among adolescents and young adults. A Psychology in Current Events class sought to increase this engagement and key skills such as critical thinking. A one-group pretest-posttest…

  4. Hot electron transport and current sensing

    Science.gov (United States)

    Abraham, Mathew Cheeran

    The effect of hot electrons on momentum scattering rates in a two-dimensional electron gas is critically examined. It is shown that with hot electrons it is possible to explore the temperature dependence of individual scattering mechanisms not easily probed under equilibrium conditions; both the Bloch-Gruneisen (BG) phonon scattering phenomena and the reduction in impurity scattering are clearly observed. The theoretical calculations are consistent with the results obtained from hot electrons experiments. As a function of bias current, a resistance peak is formed in a 2DEG if the low temperature impurity limited mobilities muI( T = 0) is comparable to muph(TBG ) the phonon limited mobility at the critical BG temperature. In this case, as the bias current is increased, the electron temperature Te rises due to Joule heating and the rapid increase in phonon scattering can be detected before the effect of the reduction in impurity scattering sets in. If muI(T = 0) wire defined in a 2DEG. Concurrently, an appropriate current imaging technique to detect this transition is sought. A rigorous evaluation of magnetic force microscopy (MFM) as a possible candidate to detect Poiseuille electronic flow was conducted, and a method that exploits the mechanical resonance of the MFM cantilever was implemented to significantly improve its current sensitivity.

  5. Cryogenic current leads

    Energy Technology Data Exchange (ETDEWEB)

    Zizek, F.

    1982-01-01

    Theoretical, technical and design questions are examined of cryogenic current leads for SP of magnetic systems. Simplified mathematical models are presented for the current leads. To illustrate modeling, the calculation is made of the real current leads for 500 A and three variants of current leads for 1500 A for the enterprise ''Shkoda.''

  6. Investigating cybercrime

    NARCIS (Netherlands)

    J.J., Oerlemans

    2017-01-01

    This study examines the following investigative methods that are commonly used in cybercrime investigations: (1) the gathering of publicly available online information, (2) the issuing of data production orders to online service providers, (3) the use of online undercover investigative methods, and

  7. Current interruption transients calculation

    CERN Document Server

    Peelo, David F

    2014-01-01

    Provides an original, detailed and practical description of current interruption transients, origins, and the circuits involved, and how they can be calculated Current Interruption Transients Calculationis a comprehensive resource for the understanding, calculation and analysis of the transient recovery voltages (TRVs) and related re-ignition or re-striking transients associated with fault current interruption and the switching of inductive and capacitive load currents in circuits. This book provides an original, detailed and practical description of current interruption transients, origins,

  8. Reconciling current approaches to blindsight

    DEFF Research Database (Denmark)

    Overgaard, Morten; Mogensen, Jesper

    2015-01-01

    After decades of research, blindsight is still a mysterious and controversial topic in consciousness research. Currently, many researchers tend to think of it as an ideal phenomenon to investigate neural correlates of consciousness, whereas others believe that blindsight is in fact a kind...

  9. Reconciling current approaches to blindsight

    DEFF Research Database (Denmark)

    Overgaard, Morten; Mogensen, Jesper

    2015-01-01

    After decades of research, blindsight is still a mysterious and controversial topic in consciousness research. Currently, many researchers tend to think of it as an ideal phenomenon to investigate neural correlates of consciousness, whereas others believe that blindsight is in fact a kind...

  10. An Investigation of Current Endodontic Practice in Turkey

    Science.gov (United States)

    Kaptan, R. F.; Haznedaroglu, F.; Kayahan, M. B.; Basturk, F. B.

    2012-01-01

    Objectives. The aim of this study was to gather information about the quality and quantity of root canal treatments carried out by general dental practitioners in Turkey. Methods. Questionnaires were given to 1400 dentists who attended the 16th National Congress organized by the Turkish Dental Association. The participants were asked to answer 34 multiple-choice questions. The questions were subdivided into 3 main topics; general information; general approach to endodontic treatment; and cleaning, shaping, and obturation of root canals. The statistical analysis was carried out by an χ 2-test to compare the means at a significance level of P Endodontic procedures in general practice in Turkey have differences from widely acknowledged quality guidelines. Despite the introduction of new instruments and techniques, most of the general practitioners chose conventional methods. PMID:23251103

  11. An Investigation of Current Endodontic Practice in Turkey

    Directory of Open Access Journals (Sweden)

    R. F. Kaptan

    2012-01-01

    Full Text Available Objectives. The aim of this study was to gather information about the quality and quantity of root canal treatments carried out by general dental practitioners in Turkey. Methods. Questionnaires were given to 1400 dentists who attended the 16th National Congress organized by the Turkish Dental Association. The participants were asked to answer 34 multiple-choice questions. The questions were subdivided into 3 main topics; general information; general approach to endodontic treatment; and cleaning, shaping, and obturation of root canals. The statistical analysis was carried out by an -test to compare the means at a significance level of . Results. The response rate for this study was 43%. There was a wide variation in the number of root canal treatments completed per month. Nearly 92% of practitioners stated that they never used rubber dam. The most commonly used working length determination technique was radiographic evaluation (. Sodium hypochlorite was the irrigant of choice with varying concentrations and AH Plus was the sealer of choice (. Resin composite was the most frequently used material for final restorations. Conclusions. Endodontic procedures in general practice in Turkey have differences from widely acknowledged quality guidelines. Despite the introduction of new instruments and techniques, most of the general practitioners chose conventional methods.

  12. Minimax Current Density Coil Design

    CERN Document Server

    Poole, Michael; Lopez, Hector Sanchez; Ng, Michael; Crozier, Stuart; 10.1088/0022-3727/43/9/095001

    2010-01-01

    'Coil design' is an inverse problem in which arrangements of wire are designed to generate a prescribed magnetic field when energized with electric current. The design of gradient and shim coils for magnetic resonance imaging (MRI) are important examples of coil design. The magnetic fields that these coils generate are usually required to be both strong and accurate. Other electromagnetic properties of the coils, such as inductance, may be considered in the design process, which becomes an optimization problem. The maximum current density is additionally optimized in this work and the resultant coils are investigated for performance and practicality. Coils with minimax current density were found to exhibit maximally spread wires and may help disperse localized regions of Joule heating. They also produce the highest possible magnetic field strength per unit current for any given surface and wire size. Three different flavours of boundary element method that employ different basis functions (triangular elements...

  13. Spin currents in metallic nanostructures

    Energy Technology Data Exchange (ETDEWEB)

    Czeschka, Franz Dominik

    2011-09-05

    A pure spin current, i.e., a flow of angular momentum without accompanying net charge current, is a key ingredient in the field of spintronics. In this thesis, we experimentally investigated two different concepts for pure spin current sources suggested by theory. The first is based on a time-dependent magnetization precession which ''pumps'' a pure spin current into an adjacent non-magnetic conductor. Our experiments quantitatively corroborated important predictions expected theoretically for this approach, including the dependence of the spin current on the sample geometry and the microwave power. Even more important, we could show for the first time that the spin pumping concept is viable in a large variety of ferromagnetic materials and that it only depends on the magnetization damping. Therefore, our experiments established spin pumping as generic phenomenon and demonstrated that it is a powerful way to generate pure spin currents. The second theoretical concept is based on the conversion of charge currents into spin currents in non-magnetic nanostructures via the spin Hall effect. We experimentally investigated this approach in H-shaped, metallic nanodevices, and found that the predictions are linked to requirements not realizable with the present experimental techniques, neither in sample fabrication nor in measurement technique. Indeed, our experimental data could be consistently understood by a spin-independent transport model describing the transition from diffusive to ballistic transport. In addition, the implementation of advanced fabrication and measurement techniques allowed to discover a new non-local phenomenon, the non-local anisotropic magnetoresistance. Finally, we also studied spin-polarized supercurrents carried by spin-triplet Cooper pairs. We found that low resistance interfaces are a key requirement for further experiments in this direction. (orig.)

  14. Currents for Arbitrary Helicity

    CERN Document Server

    Dragon, Norbert

    2016-01-01

    Using Mackey's classification of unitary representations of the Poincar\\'e group on massles states of arbitrary helicity we disprove the claim that states with helicity |h|>=1 cannot couple to a conserved current by constructing such a current.

  15. Magnetic current sensor

    Science.gov (United States)

    Black, Jr., William C. (Inventor); Hermann, Theodore M. (Inventor)

    1998-01-01

    A current determiner having an output at which representations of input currents are provided having an input conductor for the input current and a current sensor supported on a substrate electrically isolated from one another but with the sensor positioned in the magnetic fields arising about the input conductor due to any input currents. The sensor extends along the substrate in a direction primarily perpendicular to the extent of the input conductor and is formed of at least a pair of thin-film ferromagnetic layers separated by a non-magnetic conductive layer. The sensor can be electrically connected to a electronic circuitry formed in the substrate including a nonlinearity adaptation circuit to provide representations of the input currents of increased accuracy despite nonlinearities in the current sensor, and can include further current sensors in bridge circuits.

  16. Current and Current Fluctuations in Quantum Shuttles

    DEFF Research Database (Denmark)

    Jauho, Antti-Pekka; Flindt, Christian; Novotny, Tomas

    2005-01-01

    theoretical tools needed for the analysis, e.g., generalized master equations and Wigner functions, and we outline the methods how the resulting large numerical problems can be handled. Illustrative results are given for current, noise, and full counting statistics for a number of model systems. Throughout...

  17. Robotic surgery for gastric tumor: current status and new approaches.

    Science.gov (United States)

    Lim, Seung Hyun; Lee, Hae Min; Son, Taeil; Hyung, Woo Jin; Kim, Hyoung-Il

    2016-01-01

    Surgical techniques have evolved tremendously over this past century. To maximize the efficacy and minimize the invasiveness of laparoscopic surgery, researchers have sought to implement wider application of robotics. Nevertheless, both optimism without sound evidence and fear of new technology obscure the appropriate uses of robotic surgery. In the present review, we attempted to provide a balanced perspective on the current state of robotic gastrectomy, outlining evidence and opportunities for the use thereof. Although evidence is limited, the use of robotics is feasible for gastric cancer surgery, and less than 10 cases of robotic surgery are needed to become proficient therein. Compared to the clinical impact of laparoscopy on gastric cancer surgery, the additional benefits of robotic surgery to patients seem to be limited. Despite additional costs and longer surgeries, robotic surgery reportedly does not offer surgical outcomes superior to those for laparoscopic surgery, according to a recent multicenter study. Meanwhile, however, our in-depth review of retrospective and prospective reports revealed that robots could expand the indications of minimally invasive gastrectomy for patients requiring total gastrectomy and D2 lymph node dissection. Moreover, we found that robotic gastrectomy is associated with a higher number of retrieved lymph nodes, less bleeding, fewer complications, and shorter hospital stay, compared to laparoscopic gastrectomy. Accordingly, new surgical approaches using advanced technologies, such as near infrared detectors, the Tilepro(®) multi-input display, dual consoles, and the Single-Site(®) system, are under investigation. In conclusion, measuring the additional benefits of robotic over laparoscopic surgery would be difficult and clinically insignificant. Thus, developing new surgical procedures that extend the benefits of conventional laparoscopic surgery to patients in whom minimally invasive surgery would not be possible is

  18. Robotic surgery for gastric tumor: current status and new approaches

    Science.gov (United States)

    Lim, Seung Hyun; Lee, Hae Min; Son, Taeil; Hyung, Woo Jin

    2016-01-01

    Surgical techniques have evolved tremendously over this past century. To maximize the efficacy and minimize the invasiveness of laparoscopic surgery, researchers have sought to implement wider application of robotics. Nevertheless, both optimism without sound evidence and fear of new technology obscure the appropriate uses of robotic surgery. In the present review, we attempted to provide a balanced perspective on the current state of robotic gastrectomy, outlining evidence and opportunities for the use thereof. Although evidence is limited, the use of robotics is feasible for gastric cancer surgery, and less than 10 cases of robotic surgery are needed to become proficient therein. Compared to the clinical impact of laparoscopy on gastric cancer surgery, the additional benefits of robotic surgery to patients seem to be limited. Despite additional costs and longer surgeries, robotic surgery reportedly does not offer surgical outcomes superior to those for laparoscopic surgery, according to a recent multicenter study. Meanwhile, however, our in-depth review of retrospective and prospective reports revealed that robots could expand the indications of minimally invasive gastrectomy for patients requiring total gastrectomy and D2 lymph node dissection. Moreover, we found that robotic gastrectomy is associated with a higher number of retrieved lymph nodes, less bleeding, fewer complications, and shorter hospital stay, compared to laparoscopic gastrectomy. Accordingly, new surgical approaches using advanced technologies, such as near infrared detectors, the Tilepro® multi-input display, dual consoles, and the Single-Site® system, are under investigation. In conclusion, measuring the additional benefits of robotic over laparoscopic surgery would be difficult and clinically insignificant. Thus, developing new surgical procedures that extend the benefits of conventional laparoscopic surgery to patients in whom minimally invasive surgery would not be possible is necessary

  19. Controlled current inductors

    Science.gov (United States)

    Thaler, S.

    1970-01-01

    Magnetic permeability and shape of special core inserts are varied to produce desired changes in saturation characteristics of current dependent inductor, thus improving its inductance-to-current properties. Materials and saturation levels of the core pieces are selected to permit a wide variety of relationships between inductance and current.

  20. Investigating the effect among size, growth opportunity and cumulative abnormal returns of the companies

    Directory of Open Access Journals (Sweden)

    Khalil bevali behbahani

    2016-09-01

    Full Text Available The stockholders and investors require identifying main variables that explain stock return. Being aware of variables and achieving an appropriate model can lead to improve their investment and considering that each wise and economic person’s goal is obtain high and more returns, the current research is sought to investigate the effect of company’s characteristics and the ratio of investment on company’s cumulative abnormal returns. Statistical sample which has been used in current research includes 256 listed companies in Tehran Stock Exchange during 2002 to 2013. Dependent variable of current research is cumulative abnormal return. The independent variables whose effects are investigated on cumulative abnormal return include company’s size, growth opportunity. The data are collected and were inserted in Excel file as information database. Testing hypotheses also has been done from multi-variable regression models based on combined data technique using econometric software Eviews. The findings of the research show that there is a positive and significant relationship between company’s size and company’s cumulative abnormal return. There is also a negative and significant relationship between growth opportunities and company’s cumulative abnormal return.

  1. Current Flows in Pulsar Magnetospheres

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    The global structure of .current flows in pulsar magnetosphere is investigated, with rough calculations of the circuit elements. It is emphasized that the potential of the critical field lines (the field lines that intersect the null surface at the light cylinder radius) should be the same as that of interstellar medium, and that pulsars whose rotation axes and magnetic dipole axes are parallel should be positively charged, in order to close the pulsar's current flows. The statistical relation between the radio luminosity and pulsar's electric charge (or the spindown power) may hint that the millisecond pulsars could be low-mass bare strange stars.

  2. Decomposition of residue currents

    OpenAIRE

    Andersson, Mats; Wulcan, Elizabeth

    2007-01-01

    Given a submodule $J\\subset \\mathcal O_0^{\\oplus r}$ and a free resolution of $J$ one can define a certain vector valued residue current whose annihilator is $J$. We make a decomposition of the current with respect to Ass$(J)$ that correspond to a primary decomposition of $J$. As a tool we introduce a class of currents that includes usual residue and principal value currents; in particular these currents admit a certain type of restriction to analytic varieties and more generally to construct...

  3. Inrush Current Control Circuit

    Science.gov (United States)

    Cole, Steven W. (Inventor)

    2002-01-01

    An inrush current control circuit having an input terminal connected to a DC power supply and an output terminal connected to a load capacitor limits the inrush current that charges up the load capacitor during power up of a system. When the DC power supply applies a DC voltage to the input terminal, the inrush current control circuit produces a voltage ramp at the load capacitor instead of an abrupt DC voltage. The voltage ramp results in a constant low level current to charge up the load capacitor, greatly reducing the current drain on the DC power supply.

  4. Infant death scene investigation.

    Science.gov (United States)

    Tabor, Pamela D; Ragan, Krista

    2015-01-01

    The sudden unexpected death of an infant is a tragedy to the family, a concern to the community, and an indicator of national health. To accurately determine the cause and manner of the infant's death, a thorough and accurate death scene investigation by properly trained personnel is key. Funding and resources are directed based on autopsy reports, which are only as accurate as the scene investigation. The investigation should include a standardized format, body diagrams, and a photographed or videotaped scene recreation utilizing doll reenactment. Forensic nurses, with their basic nursing knowledge and additional forensic skills and abilities, are optimally suited to conduct infant death scene investigations as well as train others to properly conduct death scene investigations. Currently, 49 states have child death review teams, which is an idea avenue for a forensic nurse to become involved in death scene investigations.

  5. Electric current locator

    Science.gov (United States)

    King, Paul E [Corvallis, OR; Woodside, Charles Rigel [Corvallis, OR

    2012-02-07

    The disclosure herein provides an apparatus for location of a quantity of current vectors in an electrical device, where the current vector has a known direction and a known relative magnitude to an input current supplied to the electrical device. Mathematical constants used in Biot-Savart superposition equations are determined for the electrical device, the orientation of the apparatus, and relative magnitude of the current vector and the input current, and the apparatus utilizes magnetic field sensors oriented to a sensing plane to provide current vector location based on the solution of the Biot-Savart superposition equations. Description of required orientations between the apparatus and the electrical device are disclosed and various methods of determining the mathematical constants are presented.

  6. Current limiter circuit system

    Energy Technology Data Exchange (ETDEWEB)

    Witcher, Joseph Brandon; Bredemann, Michael V.

    2017-09-05

    An apparatus comprising a steady state sensing circuit, a switching circuit, and a detection circuit. The steady state sensing circuit is connected to a first, a second and a third node. The first node is connected to a first device, the second node is connected to a second device, and the steady state sensing circuit causes a scaled current to flow at the third node. The scaled current is proportional to a voltage difference between the first and second node. The switching circuit limits an amount of current that flows between the first and second device. The detection circuit is connected to the third node and the switching circuit. The detection circuit monitors the scaled current at the third node and controls the switching circuit to limit the amount of the current that flows between the first and second device when the scaled current is greater than a desired level.

  7. Sliding Mode Control of Induction Motor Phase Currents

    DEFF Research Database (Denmark)

    Hansen, R.B.; Hattel, T.; Bork, J

    1995-01-01

    Sliding mode control of induction motor phase currents are investigated through development of two control concepts.......Sliding mode control of induction motor phase currents are investigated through development of two control concepts....

  8. Sliding Mode Control of Induction Motor Phase Currents

    DEFF Research Database (Denmark)

    Hansen, R.B.; Hattel, T.; Bork, J

    1995-01-01

    Sliding mode control of induction motor phase currents are investigated through development of two control concepts.......Sliding mode control of induction motor phase currents are investigated through development of two control concepts....

  9. Status Epilepticus Induced Spontaneous Dentate Gyrus Spikes: In Vivo Current Source Density Analysis.

    Science.gov (United States)

    Flynn, Sean P; Barriere, Sylvain; Barrier, Sylvain; Scott, Rod C; Lenck-Santini, Pierre-Pascal; Holmes, Gregory L

    2015-01-01

    The dentate gyrus is considered to function as an inhibitory gate limiting excitatory input to the hippocampus. Following status epilepticus (SE), this gating function is reduced and granule cells become hyper-excitable. Dentate spikes (DS) are large amplitude potentials observed in the dentate gyrus (DG) of normal animals. DS are associated with membrane depolarization of granule cells, increased activity of hilar interneurons and suppression of CA3 and CA1 pyramidal cell firing. Therefore, DS could act as an anti-excitatory mechanism. Because of the altered gating function of the dentate gyrus following SE, we sought to investigate how DS are affected following pilocarpine-induced SE. Two weeks following lithium-pilocarpine SE induction, hippocampal EEG was recorded in male Sprague-Dawley rats with 16-channel silicon probes under urethane anesthesia. Probes were placed dorso-ventrally to encompass either CA1-CA3 or CA1-DG layers. Large amplitude spikes were detected from EEG recordings and subject to current source density analysis. Probe placement was verified histologically to evaluate the anatomical localization of current sinks and the origin of DS. In 9 of 11 pilocarpine-treated animals and two controls, DS were confirmed with large current sinks in the molecular layer of the dentate gyrus. DS frequency was significantly increased in pilocarpine-treated animals compared to controls. Additionally, in pilocarpine-treated animals, DS displayed current sinks in the outer, middle and/or inner molecular layers. However, there was no difference in the frequency of events when comparing between layers. This suggests that following SE, DS can be generated by input from medial and lateral entorhinal cortex, or within the dentate gyrus. DS were associated with an increase in multiunit activity in the granule cell layer, but no change in CA1. These results suggest that following SE there is an increase in DS activity, potentially arising from hyperexcitability along the

  10. Status Epilepticus Induced Spontaneous Dentate Gyrus Spikes: In Vivo Current Source Density Analysis.

    Directory of Open Access Journals (Sweden)

    Sean P Flynn

    Full Text Available The dentate gyrus is considered to function as an inhibitory gate limiting excitatory input to the hippocampus. Following status epilepticus (SE, this gating function is reduced and granule cells become hyper-excitable. Dentate spikes (DS are large amplitude potentials observed in the dentate gyrus (DG of normal animals. DS are associated with membrane depolarization of granule cells, increased activity of hilar interneurons and suppression of CA3 and CA1 pyramidal cell firing. Therefore, DS could act as an anti-excitatory mechanism. Because of the altered gating function of the dentate gyrus following SE, we sought to investigate how DS are affected following pilocarpine-induced SE. Two weeks following lithium-pilocarpine SE induction, hippocampal EEG was recorded in male Sprague-Dawley rats with 16-channel silicon probes under urethane anesthesia. Probes were placed dorso-ventrally to encompass either CA1-CA3 or CA1-DG layers. Large amplitude spikes were detected from EEG recordings and subject to current source density analysis. Probe placement was verified histologically to evaluate the anatomical localization of current sinks and the origin of DS. In 9 of 11 pilocarpine-treated animals and two controls, DS were confirmed with large current sinks in the molecular layer of the dentate gyrus. DS frequency was significantly increased in pilocarpine-treated animals compared to controls. Additionally, in pilocarpine-treated animals, DS displayed current sinks in the outer, middle and/or inner molecular layers. However, there was no difference in the frequency of events when comparing between layers. This suggests that following SE, DS can be generated by input from medial and lateral entorhinal cortex, or within the dentate gyrus. DS were associated with an increase in multiunit activity in the granule cell layer, but no change in CA1. These results suggest that following SE there is an increase in DS activity, potentially arising from

  11. Quantization of interface currents

    Energy Technology Data Exchange (ETDEWEB)

    Kotani, Motoko [AIMR, Tohoku University, Sendai (Japan); Schulz-Baldes, Hermann [Department Mathematik, Universität Erlangen-Nürnberg, Erlangen (Germany); Villegas-Blas, Carlos [Instituto de Matematicas, Cuernavaca, UNAM, Cuernavaca (Mexico)

    2014-12-15

    At the interface of two two-dimensional quantum systems, there may exist interface currents similar to edge currents in quantum Hall systems. It is proved that these interface currents are macroscopically quantized by an integer that is given by the difference of the Chern numbers of the two systems. It is also argued that at the interface between two time-reversal invariant systems with half-integer spin, one of which is trivial and the other non-trivial, there are dissipationless spin-polarized interface currents.

  12. Low current beam techniques

    Energy Technology Data Exchange (ETDEWEB)

    Saint, A.; Laird, J.S.; Bardos, R.A.; Legge, G.J.F. [Melbourne Univ., Parkville, VIC (Australia). School of Physics; Nishijima, T.; Sekiguchi, H. [Electrotechnical Laboratory, Tsukuba (Japan).

    1993-12-31

    Since the development of Scanning Transmission Microscopy (STIM) imaging in 1983 many low current beam techniques have been developed for the scanning (ion) microprobe. These include STIM tomography, Ion Beam Induced Current, Ion Beam Micromachining and Microlithography and Ionoluminense. Most of these techniques utilise beam currents of 10{sup -15} A down to single ions controlled by beam switching techniques This paper will discuss some of the low beam current techniques mentioned above, and indicate, some of their recent applications at MARC. A new STIM technique will be introduced that can be used to obtain Z-contrast with STIM resolution. 4 refs., 3 figs.

  13. Investigating Corruption

    OpenAIRE

    Prendergast, Canice

    2000-01-01

    Agency theory has had little to say about the control of bureaucratic corruption, perhaps the greatest agency problem that exists. The author considers the role of incentive contracting in reducing corruption through the use of independent investigations-a common way to monitor corruption. In simple settings, bureaucratic corruption can be suppressed by rewarding and penalizing bureaucrats...

  14. 单相变压器空载合闸励磁涌流暂态特性建模与实验%Modeling and experiment investigation of the transient characteristics of magnetizing inrush current in the switch-on of unloaded single phase transformer

    Institute of Scientific and Technical Information of China (English)

    潘洋; 来磊; 石雷兵; 邵海明; 朱力

    2012-01-01

    The primary winding of the transformer will generate large inrush current due to the saturation of iron core when an unloaded transformer is switched-on. The inrush current not only causes mechanical interaction force due to which the windings are damaged, but also induces the differential protection relays to operate incorrectly. In this paper, the mathematical model of unloaded single phase transformer in switeh-on is analyzed; the computation formulas of the inrush current and its interruption angle are presented. The experiment investigation of single phase transformers with different capacities shows that the inrush current measurement result is consistent with theoretical analysis. The inrush current waveform is typically a steeple top waveform with high order harmonics and damping in one direction. In the same condition, large inrush current amplitude will be induced with smaller switching angle, larger residual flux and smaller staturation flux.%变压器在空载合闸时,由于铁芯饱和导致在变压器的一次绕组内会产生很大的励磁涌流.励磁涌流一方面会引起变压器差动保护装置的误动作;另一方面励磁涌流会导致绕组之间产生机械力作用而损伤绕组.通过分析单相变压器空载合闸的数学模型得出了励磁涌流及其间断角的计算公式.采用分流器和数字示波器对不同容量的单相变压器进行测量后得到了与理论分析一致的涌流波形.理论和实验结果表明励磁涌流是含有高次谐波的单侧衰减尖顶波.在相同条件下,合闸角越小、铁芯剩磁越大、饱和磁通越小,都会导致产生更大的励磁涌流幅值.

  15. Dipolarization front and current disruption

    Science.gov (United States)

    Lui, A. T. Y.

    2016-10-01

    The modification of current density on the dawn-dusk cross section of the magnetotail with the earthward approach of a dipolarization front (DF) is examined through the recently published results of a three-dimensional (3-D) particle-in-cell (PIC) simulation. It is found that the current density intensifies by 37% abruptly within 1.5 ion gyrotime as the DF approaches and shows localized regions with north-south extrusions. After reaching its peak value, it undergoes a drastic current reduction (DCR) by 65% within 2 ion gyrotime. Breakdown of the frozen-in condition occurs in the neutral sheet region in association with DCR, demonstrating the non-MHD behavior of the phenomenon. The evolution of current density from this 3-D PIC simulation bears several similarities to those observed for the current disruption (CD) phenomenon, such as explosive growth and disruption of the current density leading to a breakdown of the frozen-in condition. The evolution is also similar to those from a previous two-dimensional (2-D) PIC simulation specially designed to investigate the nonlinear evolution of the cross-field current instability for CD. One interpretation of these findings is that CD and substorm triggering can be associated with earthward intrusion of a DF into the near-Earth plasma sheet as indicated by previous Cluster and Time History of Events and Macroscale Interactions during Substorms observations. An alternative interpretation is that both DF and CD are consequences of a global evolution from an ion-tearing-like instability of the magnetotail.

  16. Merging of plasma currents

    NARCIS (Netherlands)

    Bergmans, J.; Schep, T. J.

    2001-01-01

    The merging process of current filaments in a strongly magnetized plasma is described. The evolution is calculated using a contour dynamics method, which accurately tracks piecewise constant distributions of the conserved quantities. In the interaction of two screened currents, both develop dipolar

  17. The Bransfield Gravity Current

    NARCIS (Netherlands)

    Sangrà, P.; Stegner, A.; Hernández-Arencibia, Mónica; Márrero-Díaz, A.; Salinas, C.; Aguiar-González, B.; Henríquez-Pastene, C.H.; Mouriño-Carballido, B.

    2017-01-01

    Using in situ data and laboratory experiments, we show that the circulation of the Bransfield Current (BC) around the South Shetland Islands (SSI) may be characterized in terms of a propagating buoyant gravity current. First, we describe the SSI hydrography and some drifter trajectories, paying spec

  18. Discrete Noether Currents

    CERN Document Server

    Seidl, Gerhart

    2014-01-01

    We present a simple generalization of Noether's theorem for discrete symmetries in relativistic continuum field theories. We calculate explicitly the conserved current for several discrete spacetime and internal symmetries. In addition, we formulate an analogue of the Ward-Takahashi identity for the Noether current associated with a discrete symmetry.

  19. Direct current transformer

    Science.gov (United States)

    Khanna, S. M.; Urban, E. W. (Inventor)

    1979-01-01

    A direct current transformer in which the primary consists of an elongated strip of superconductive material, across the ends of which is direct current potential is described. Parallel and closely spaced to the primary is positioned a transformer secondary consisting of a thin strip of magnetoresistive material.

  20. Electric Current Solves Mazes

    Science.gov (United States)

    Ayrinhac, Simon

    2014-01-01

    We present in this work a demonstration of the maze-solving problem with electricity. Electric current flowing in a maze as a printed circuit produces Joule heating and the right way is instantaneously revealed with infrared thermal imaging. The basic properties of electric current can be discussed in this context, with this challenging question:…

  1. The Bransfield Gravity Current

    NARCIS (Netherlands)

    Sangrà, P.; Stegner, A.; Hernández-Arencibia, Mónica; Márrero-Díaz, A.; Salinas, C.; Aguiar-González, B.; Henríquez-Pastene, C.H.; Mouriño-Carballido, B.

    2017-01-01

    Using in situ data and laboratory experiments, we show that the circulation of the Bransfield Current (BC) around the South Shetland Islands (SSI) may be characterized in terms of a propagating buoyant gravity current. First, we describe the SSI hydrography and some drifter trajectories, paying

  2. The Bransfield Gravity Current

    Science.gov (United States)

    Sangrà, Pablo; Stegner, Alexander; Hernández-Arencibia, Mónica; Marrero-Díaz, Ángeles; Salinas, Carolina; Aguiar-González, Borja; Henríquez-Pastene, Cristian; Mouriño-Carballido, Beatriz

    2017-01-01

    Using in situ data and laboratory experiments, we show that the circulation of the Bransfield Current (BC) around the South Shetland Islands (SSI) may be characterized in terms of a propagating buoyant gravity current. First, we describe the SSI hydrography and some drifter trajectories, paying special attention to the recirculation of the BC at the northeastern tip and northern slopes of the SSI. We observed that when the northeastward-flowing BC reaches the northeastern tip of the SSI, it recirculates around an anticyclonic mesoscale eddy that has not previously been reported in this region. Part of this recirculating water then proceeds southwest along the northern SSI shelf break as a narrow baroclinic jet and another part join the Antarctic Circumpolar Current. Consequently, the cross-slope gradients of properties strengthen, and the southern boundary of the Antarctic Circumpolar Current becomes a nearly submesoscale ( 10 km) front. Second, we compare the observations with buoyant gravity current laboratory experiments in an open basin setup where the SSI topographic barrier is represented by a central wall. The resulting circulation of the buoyant gravity current around the wall mirrors our in situ observations. First, a narrow buoyant gravity current flows northeastward along the southern boundary of the wall. Once the head of the buoyant gravity current reaches the tip of the wall, a recirculating anticyclonic vortex is generated, and the buoyant gravity current then proceeds westward along the north side of the wall. This circulation of the BC around the SSI as a buoyant gravity current may contribute to the fertilization of the waters around the SSI, as suggested by previously reported distributions of nutrients and phytoplankton.

  3. Legibility Investigations

    DEFF Research Database (Denmark)

    Beier, Sofie

    2013-01-01

    . One is the master typeface; three of the remaining typefaces have one stylistic feature that differs from the master (skeleton, weight, and width); and three have two stylistic features that differ from the master (weight/skeleton, weight/contrast and weight/width). In an experimental investigation...... where the test material is based on the different members of Neutral Test, the researcher will thus be able to identify the specific stylistic feature that causes a given difference in performance....

  4. On current trace problem

    Institute of Scientific and Technical Information of China (English)

    2000-01-01

    The pricing of electricity trasmission requires determining how much use each generator is making of a transmission line and what is each generator's contribution to the system losses. Such problems cannot be solved by only using Kirchoff's laws. This paper proposes two current decomposition axioms based on which the theories and models are established for the current trace problem. To create an efficient algorithm the graph theory is employed. It is proved that there is no directed circuit in a directed current distribution graph. According to this theorem a very simple and efficient algorithm based on recursive elimination process is suggested. A simple example is used to explain the algorithm.

  5. Turbulent current drive mechanisms

    Science.gov (United States)

    McDevitt, Christopher J.; Tang, Xian-Zhu; Guo, Zehua

    2017-08-01

    Mechanisms through which plasma microturbulence can drive a mean electron plasma current are derived. The efficiency through which these turbulent contributions can drive deviations from neoclassical predictions of the electron current profile is computed by employing a linearized Coulomb collision operator. It is found that a non-diffusive contribution to the electron momentum flux as well as an anomalous electron-ion momentum exchange term provide the most efficient means through which turbulence can modify the mean electron current for the cases considered. Such turbulent contributions appear as an effective EMF within Ohm's law and hence provide an ideal means for driving deviations from neoclassical predictions.

  6. Current and Future School Psychologists' Preparedness to Work with LGBT Students: Role of Education and Gay-Straight Alliances

    Science.gov (United States)

    Arora, Prerna G.; Kelly, Jennifer; Goldstein, Thalia R.

    2016-01-01

    This study sought to assess current and future school psychologists' attitudes toward and preparedness to address the needs of lesbian, gay, bisexual, and transgender (LGBT) students in schools. Two-hundred seventy-nine school psychologists (n = 162, 58%) and school psychology graduate students (n = 117, 42%) were included in the study.…

  7. Mortality investigation

    Science.gov (United States)

    Work, Thierry M.; Franson, J. Christian; Friend, Milton; Gibbs, Samantha E.J.; Wild, Margaret A.

    2015-01-01

    Wildlife mortality events usually occur unannounced and may find management agencies unaware. These events can become highly visible and politically charged affairs, depending upon the scale or species involved. The public, media, and (or) politicians may pressure managers, field investigators, and diagnosticians to quickly identify the cause or to comment on potential causes, the significance of the event, what is being done about it, and a resolution. It may be common during such events for speculation to rage, and for conflicting theories to be advanced to explain either the environmental conditions that led to the mortality or the actual cause of death.

  8. Current prevalence rate of latex allergy

    National Research Council Canada - National Science Library

    Miaozong Wu; James McIntosh; Jian Liu

    2016-01-01

      Objectives: This article aims to review the current prevalence rate of latex allergy among healthcare workers, susceptible patients, and the general public, and to investigate why latex is still a ubiquitous...

  9. Water Current Observations

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Tidal, river and ocean current observations collected by the U.S. Coast and Geodetic Survey. Period of record is late 1800s to mid-1980s.

  10. Prognosis - Cancer Currents Blog

    Science.gov (United States)

    A catalog of posts from NCI’s Cancer Currents blog on research related to cancer prognosis. Includes posts on factors that influence prognosis, prognostic biomarkers, and doctor-patient communications about prognosis.

  11. NOAA NDBC SOS - currents

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The NOAA NDBC SOS server is part of the IOOS DIF SOS Project. The stations in this dataset have currents data. Because of the nature of SOS requests, requests for...

  12. AUTO FIB Current Status

    Science.gov (United States)

    Parry, I.; Sharples, R. M.

    The current status of the automated fibre positioner, Autofib, is reviewed including the positioning performance and the set-up speed. Future plans to build another Autofib for the 4.2 m William Herschel Telescope are also briefly discussed.

  13. Electrifying Current Events.

    Science.gov (United States)

    Smith, Philip

    1980-01-01

    The author describes how he has adapted the television quiz show format of "College Bowl" to current events study for junior high school students. An insert explains use of the same technique with fourth graders. (SJL)

  14. Geothermal Energy: Current abstracts

    Energy Technology Data Exchange (ETDEWEB)

    Ringe, A.C. (ed.)

    1988-02-01

    This bulletin announces the current worldwide information available on the technologies required for economic recovery of geothermal energy and its use as direct heat or for electric power production. (ACR)

  15. Current Icing Product

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The Current Icing Product (CIP) is an automatically-generated index suitable for depicting areas of potentially hazardous airframe icing. The CIP algorithm combines...

  16. Current Resource Imagery Projects

    Data.gov (United States)

    Farm Service Agency, Department of Agriculture — Map showing coverage of current Resource imagery projects. High resolution/large scale Resource imagery is typically acquired for the U.S. Forest Service and other...

  17. Medicare Current Beneficiary Survey

    Data.gov (United States)

    U.S. Department of Health & Human Services — The Characteristics and Perceptions of the Medicare Population Data from the 2010 Medicare Current Beneficiary Survey is a series of source books based on the...

  18. Eddy current testing

    Energy Technology Data Exchange (ETDEWEB)

    Song, Sung Jin; Lee, Hyang Beom; Kim, Young Hwan [Soongsil Univ., Seoul (Korea, Republic of); Shin, Young Kil [Kunsan Univ., Gunsan (Korea, Republic of)

    2004-02-15

    Eddy current testing has been widely used for non destructive testing of steam generator tubes. In order to retain reliability in ECT, the following subjects were carried out in this study: numerical modeling and analysis of defects by using BC and RPC probes in SG tube, preparation of absolute coil impedance plane diagram by FEM. Signal interpretation of the eddy current signals obtained from nuclear power plants.

  19. Energy from streaming current and potential

    NARCIS (Netherlands)

    Olthuis, Wouter; Schippers, Bob; Eijkel, Jan C.T.; van den Berg, Albert

    2005-01-01

    It is investigated how much energy can be delivered by a streaming current source. A streaming current and subsequent streaming potential originate when double layer charge is transported by hydrodynamic flow. Theory and a network model of such a source is presented and initial experimental results

  20. Harmonic Current Predictors for Wind Turbines

    Directory of Open Access Journals (Sweden)

    Shun-Yu Chan

    2013-03-01

    Full Text Available The harmonic impact caused by wind turbines should be carefully investigated before wind turbines are interconnected. However, the harmonic currents of wind turbines are not easily predicted due to the variations of wind speed. If the harmonic current outputs can be predicted accurately, the harmonic impact of wind turbines and wind farms for power grids can be analyzed efficiently. Therefore, this paper analyzes the harmonic current characteristics of wind turbines and investigates the feasibility of developing harmonic current predictors. Field measurement, data sorting, and analysis are conducted for wind turbines. Two harmonic current predictors are proposed based on the measured harmonic data. One is the Auto-Regressive and Moving Average (ARMA-based harmonic current predictor, which can be used for real-time prediction. The other is the stochastic harmonic current predictor considering the probability density distributions of harmonic currents. It uses the measured harmonic data to establish the probability density distributions of harmonic currents at different wind speeds, and then uses them to implement a long-term harmonic current prediction. Test results use the measured data to validate the forecast ability of these two harmonic current predictors. The ARMA-based predictor obtains poor performance on some harmonic orders due to the stochastic characteristics of harmonic current caused by the variations of wind speed. Relatively, the prediction results of stochastic harmonic current predictor show that the harmonic currents of a wind turbine in long-term operation can be effectively analyzed by the established probability density distributions. Therefore, the proposed stochastic harmonic current predictor is helpful in predicting and analyzing the possible harmonic problems during the operation of wind turbines and wind farms.

  1. Persistent spin current in nanodevices and definition of the spin current

    Science.gov (United States)

    Sun, Qing-Feng; Xie, X. C.; Wang, Jian

    2008-01-01

    We investigate two closely related subjects: (i) the existence of a pure persistent spin current without an accompanying charge current in a semiconducting mesoscopic device with a spin-orbit interaction (SOI) and (ii) the definition of the spin current in the presence of SOI. Through physical argument from four physical pictures in different aspects, we provide strong evidences that the equilibrium persistent spin current does exist in a device with SOI in the absence of any magnetic field or magnetic materials. This persistent spin current is an analog of the persistent charge current in a mesoscopic ring threaded by a magnetic flux, and it describes the real spin motion and can be measured experimentally. We then investigate the definition of the spin current. We point out that (i) the nonzero spin current in the equilibrium SOI device is the persistent spin current, (ii) the spin current is, in general, not conserved, and (iii) the Onsager relation is violated for the spin transport no matter what definition of the spin current is used. These issues, the nonzero spin current in the equilibrium case, the nonconserved spin current, and the violation of the Onsager relation, are intrinsic properties of spin transport. We note that the conventional definition of the spin current has very clear physical intuition and describes the spin motion very well. Therefore, we feel that the conventional definition of the spin current makes physical sense, and there is no need to modify it. (Note that this conclusion is not in contradiction with the opinions in our previous papers). In addition, the relationship between the persistent spin current and transport spin current, the persistent linear and angular spin currents in the SOI region of the hybrid ring, and the measurement of the persistent spin current are discussed. Finally, we show that if the spin-spin interaction is included into the Hamiltonian, the persistent spin current is automatically conserved using the

  2. The Investigation and Analysis of Current Situation for Local College Students' Entrepreneurship Education%地方院校大学生创新创业教育现状调查与分析--以九江学院为例

    Institute of Scientific and Technical Information of China (English)

    钟林飞

    2016-01-01

    Under the social background of"Public entrepreneurship, Innovation”, colleges and universities are promoting innova-tion and entrepreneurship education for college students. Through various methods of investigation, the author understands that the students' awareness of innovation and entrepreneurship education, and the current situation of innovation and Entrepreneur-ship Education in Jiujiang University. The current development and existing problems of entrepreneurship education in colleges and universities are brought out and the corresponding suggestions are put forward.%在“大众创业,万众创新”的社会背景下,各地高校都在倡导大学生创新创业教育。笔者通过多种调查方式,了解到九江学院大学生对创新创业教育的认识和当前创新创业教育的现状,由点及面,找出当前大学生创业教育存在的问题,并对此提出了相应的建议。

  3. DC superconducting fault current limiter

    Science.gov (United States)

    Tixador, P.; Villard, C.; Cointe, Y.

    2006-03-01

    There is a lack of satisfying solutions for fault currents using conventional technologies, especially in DC networks, where a superconducting fault current limiter could play a very important part. DC networks bring a lot of advantages when compared to traditional AC ones, in particular within the context of the liberalization of the electric market. Under normal operation in a DC network, the losses in the superconducting element are nearly zero and only a small, i.e. a low cost, refrigeration system is then required. The absence of zero crossing of a DC fault current favourably accelerates the normal zone propagation. The very high current slope at the time of the short circuit in a DC grid is another favourable parameter. The material used for the experiments is YBCO deposited on Al2O3 as well as YBCO coated conductors. The DC limitation experiments are compared to AC ones at different frequencies (50-2000 Hz). Careful attention is paid to the quench homogenization, which is one of the key issues for an SC FCL. The University of Geneva has proposed constrictions. We have investigated an operating temperature higher than 77 K. As for YBCO bulk, an operation closer to the critical temperature brings a highly improved homogeneity in the electric field development. The material can then absorb large energies without degradation. We present tests at various temperatures. These promising results are to be confirmed over long lengths.

  4. Persistent spin current in nano-devices and definition of the spin current

    OpenAIRE

    Sun, Qing-feng; Xie, X. C.; WANG Jian

    2008-01-01

    We investigate two closely related subjects: (i) existence of a pure persistent spin current in semiconducting mesoscopic device with a spin-orbit interaction's (SOI), and (ii) the definition of the spin current in the presence of SOI. Through physical argument from four physical pictures in different aspects, we provide strong evidences that the persistent spin current does exist in a device with SOI in the absence of any magnetic materials. This persistent spin current is an analog of the p...

  5. Adolescent idiopathic scoliosis: current perspectives

    OpenAIRE

    2014-01-01

    Firoz MiyanjiBritish Columbia Children's Hospital, Vancouver, BC, CanadaAbstract: Adolescent idiopathic scoliosis (AIS) remains a common and potentially severe musculoskeletal disorder. Although its etiology is largely unknown, ongoing research endeavors continue to improve our understanding of its potential origin and its natural history. Advances in understanding its true three-dimensional nature have sought to improve classification and management strategies. This review will attem...

  6. Investigative negotiation.

    Science.gov (United States)

    Malhotra, Deepak; Bazerman, Max H

    2007-09-01

    Negotiators often fail to achieve results because they channel too much effort into selling their own position and too little into understanding the other party's perspective. To get the best deal -or, sometimes, any deal at al--egotiators need to think like detectives, digging for information about why the other side wants what it does. This investigative approach entails a mind-set and a methodology, say Harvard Business School professors Malhotra and Bazerman. Inaccurate assumptions about the other side's motivations can lead negotiators to propose solutions to the wrong problems, needlessly give away value, or derail deals altogether. Consider, for example, the pharmaceutical company that deadlocked with a supplier over the issue of exclusivity in an ingredient purchase. Believing it was a ploy to raise the price, the drugmaker upped its offer--unsuccessfully. In fact, the supplier was balking because a relative's company needed a small amount of the ingredient to make a local product. Once the real motivation surfaced, a compromise quickly followed. Understanding the other side's motives and goals is the first principle of investigative negotiation. The second is to figure out what constraints the other party faces. Often when your counterpart's behavior appears unreasonable, his hands are tied somehow, and you can reach agreement by helping overcome those limitations. The third is to view onerous demands as a window into what the other party prizes most--and use that information to create opportunities. The fourth is to look for common ground; even fierce competitors may have complementary interests that lead to creative agreements. Finally, if a deal appears lost, stay at the table and keep trying to learn more. Even if you don't win, you can gain insights into a customer's future needs, the interests of similar customers, or the strategies of competitors.

  7. Current pulse shaping of the load current on PTS

    Directory of Open Access Journals (Sweden)

    Minghe Xia

    2016-02-01

    Full Text Available The typical rise time of PTS machine is ∼110 ns with about 10 MA peak current under short pulse mode when all 24 modules discharge simultaneously. By distributing the trigger times of 12 laser beams logically and adjusting the statues of the pulse output switches, longer rise-time pulse can be obtained on the PTS facility. Based on the required pulse shape, whole circuit simulations will be used to calculate the trigger times of each laser triggering gas switch and the status of the pulse output switches. The rise time of the current is determined by the time difference between the first and last trigged laser triggering gas switches. In order to trigger the laser triggering gas switch, sufficient laser power is needed to be sent into the gap of the gas switches. The gas pressure and voltage difference on the two electrodes of the gas switches also affect the triggering of the gas switches, and the voltage added on the gas switch is determined by its transition time. Traditionally the trigger time difference should be less than the transition time of the two neighboring modules. A new simulation model of PTS shows one can break this transition time limits. Series of current pulse shaping experiments have been investigated on the PTS (Primary Test Stand. As results, more than 5 MA peak current were successfully achieved on the load with a rise time of 600 ns. This study and experiments of the pulse shaping on PTS demonstrate the adaptable ability of the PTS for offering different waveform of mega ampere current pulse for different research purpose.

  8. A spin cell for spin current.

    Science.gov (United States)

    Sun, Qing-feng; Guo, Hong; Wang, Jian

    2003-06-27

    We propose and investigate a spin-cell device which provides the necessary spin-motive force to drive a spin current for future spintronic circuits. Our spin cell has four basic characteristics: (i) it has two poles so that a spin current flows in from one pole and out from the other pole, and in this way a complete spin circuit can be established; (ii) it has a source of energy to drive the spin current; (iii) it maintains spin coherence so that a sizable spin current can be delivered; (iv) it drives a spin current without a charge current. The proposed spin cell for spin current should be realizable using technologies presently available.

  9. Submesoscale cyclones in the Agulhas current

    Science.gov (United States)

    Krug, M.; Swart, S.; Gula, J.

    2017-01-01

    Gliders were deployed for the first time in the Agulhas Current region to investigate processes of interactions between western boundary currents and shelf waters. Continuous observations from the gliders in water depths of 100-1000 m and over a period of 1 month provide the first high-resolution observations of the Agulhas Current's inshore front. The observations collected in a nonmeandering Agulhas Current show the presence of submesoscale cyclonic eddies, generated at the inshore boundary of the Agulhas Current. The submesoscale cyclones are often associated with warm water plumes, which extend from their western edge and exhibit strong northeastward currents. These features are a result of shear instabilities and extract their energy from the mean Agulhas Current jet.

  10. The Chukchi slope current

    Science.gov (United States)

    Corlett, W. Bryce; Pickart, Robert S.

    2017-04-01

    Using a collection of 46 shipboard hydrographic/velocity transects occupied across the shelfbreak and slope of the Chukchi Sea between 2002 and 2014, we have quantified the existence of a current transporting Pacific-origin water westward over the upper continental slope. It has been named the Chukchi slope current, which is believed to emanate from Barrow Canyon. The current is surface-intensified, order 50 km wide, and advects both summer and winter waters. It is not trapped to a particular isobath, but instead is reminiscent of a free jet. There is no significant variation in Pacific water transport with distance from Barrow Canyon. A potential vorticity analysis suggests that the flow is baroclinically unstable, consistent with the notion that it meanders. The current is present during all synoptic wind conditions, but increases in strength from summer to fall presumably due to the seasonal enhancement of the easterly winds in the region. Its transport increased over the 12-year period of data coverage, also likely in response to wind forcing. In the mean, the slope current transports 0.50 ± 0.07 Sv of Pacific water. This estimate allows us to construct a balanced mass budget of the Chukchi shelf inflows and outflows. Our study also confirms the existence of an eastward-flowing Chukchi shelfbreak jet transporting 0.10 ± 0.03 Sv of Pacific water towards Barrow Canyon.

  11. On current trace problem

    Institute of Scientific and Technical Information of China (English)

    王锡凡; 王秀丽

    2000-01-01

    The pricing of electricity trasmission requires determining how much use each generator is making of a transmission line and what is each generator’s contribution to the system losses. Such problems cannot be solved by only using Kirchoff’s laws. This paper proposes two current decomposition axioms based on which the theories and models are established for the current trace problem. To create an efficient algorithm the graph theory is employed. It is proved that there is no directed circuit in a directed current distribution graph. According to this theorem a very simple and efficient algorithm based on recursive elimination process is suggested. A simple example is used to explain the algorithm .

  12. Decomposing the Current

    DEFF Research Database (Denmark)

    Hansen, Tim

    The field of molecular electronics have been shown to span a huge range of properties. In an effort to extract the parameters of the system that governs these properties, a number of methods that decomposes the current have been developed. These methods function not just as tools for data...... extraction, but also serves as the foundation upon which to gain insights into the physics that governs the molecular properties. As such, the understanding of the applicability and the development of new methods to decompose the current may be a goal in it self. In this thesis we will explore some...... of these methods, and use the insights from this study to develop new methods. First, we will compare two methods that decompose the current into the transmission from a single conducting level of the molecular device, by extracting level position and broadening. In general we see that the method that relies on I...

  13. Models of current sintering

    Science.gov (United States)

    Angst, Sebastian; Engelke, Lukas; Winterer, Markus; Wolf, Dietrich E.

    2017-06-01

    Densification of (semi-)conducting particle agglomerates with the help of an electrical current is much faster and more energy efficient than traditional thermal sintering or powder compression. Therefore, this method becomes more and more common among experimentalists, engineers, and in industry. The mechanisms at work at the particle scale are highly complex because of the mutual feedback between current and pore structure. This paper extends previous modelling approaches in order to study mixtures of particles of two different materials. In addition to the delivery of Joule heat throughout the sample, especially in current bottlenecks, thermoelectric effects must be taken into account. They lead to segregation or spatial correlations in the particle arrangement. Various model extensions are possible and will be discussed.

  14. Decomposing the Current

    DEFF Research Database (Denmark)

    Hansen, Tim

    The field of molecular electronics have been shown to span a huge range of properties. In an effort to extract the parameters of the system that governs these properties, a number of methods that decomposes the current have been developed. These methods function not just as tools for data...... extraction, but also serves as the foundation upon which to gain insights into the physics that governs the molecular properties. As such, the understanding of the applicability and the development of new methods to decompose the current may be a goal in it self. In this thesis we will explore some...... of these methods, and use the insights from this study to develop new methods. First, we will compare two methods that decompose the current into the transmission from a single conducting level of the molecular device, by extracting level position and broadening. In general we see that the method that relies on I...

  15. Transport critical current of MgB2 wires: pulsed current of varying rate compared to direct current method

    Science.gov (United States)

    See, K. W.; Xu, X.; Horvat, J.; Cook, C. D.; Dou, S. X.

    2011-10-01

    The measurement of transport critical current (Ic) for MgB2 wires and tapes has been investigated with two different techniques, the conventional four-probe arrangement with direct current (DC) power source, and a tailored triangle pulse at different rates of current change. The DC method has been widely used and practiced by various groups, but suffers from inevitable heating effects when high currents are used at low magnetic fields. The pulsed current method has no heating effects, but the critical current can depend on the rate of the current change (dI/dt) in the pulse. Our pulsed current measurements with varying dI/dt show that the same values of Ic are obtained as with the DC method, but without the artifacts of heating. Our method is particularly useful at low field regions which are often inaccessible by DC methods. We also performed a finite element method (FEM) analysis to obtain the time dependent heat distribution in MgB2 due to the electric potential produced at the current contacts to the superconducting sample and its gradient around the contacts. This gradient is defined as the current transfer length (CTL) of the samples and leads to Joule heating of the wire near the contacts. The FEM results provide further evidence of the limitation of the DC method in obtaining high transport critical current.

  16. Electric Current Circuits in Astrophysics

    CERN Document Server

    Kuijpers, Jan; Fletcher, Lyndsay

    2014-01-01

    Cosmic magnetic structures have in common that they are anchored in a dynamo, that an external driver converts kinetic energy into internal magnetic energy, that this magnetic energy is transported as Poynting flux across the magnetically dominated structure, and that the magnetic energy is released in the form of particle acceleration, heating, bulk motion, MHD waves, and radiation. The investigation of the electric current system is particularly illuminating as to the course of events and the physics involved. We demonstrate this for the radio pulsar wind, the solar flare, and terrestrial magnetic storms.

  17. Current concepts in osteolysis.

    Science.gov (United States)

    Ollivere, B; Wimhurst, J A; Clark, I M; Donell, S T

    2012-01-01

    The most frequent cause of failure after total hip replacement in all reported arthroplasty registries is peri-prosthetic osteolysis. Osteolysis is an active biological process initiated in response to wear debris. The eventual response to this process is the activation of macrophages and loss of bone. Activation of macrophages initiates a complex biological cascade resulting in the final common pathway of an increase in osteolytic activity. The biological initiators, mechanisms for and regulation of this process are beginning to be understood. This article explores current concepts in the causes of, and underlying biological mechanism resulting in peri-prosthetic osteolysis, reviewing the current basic science and clinical literature surrounding the topic.

  18. Current power plant

    Energy Technology Data Exchange (ETDEWEB)

    Nickell, J.H.

    1979-03-06

    A current power plant is described that includes a shaft mounted turbine wheel for employment in water current, a housing adjacent the impeller and to which the shaft extends, a ramp positioned on the upstream side of the impellar, and a frame on which the turbine wheel is mounted. The frame is mounted by rollers on a tract such that the impeller and frame may be rolled on the tracks inside the housing, whereafter doors are closed, and water around the turbine wheel may be pumped out to facilitate turbine repair.

  19. Induction motor starting current

    Energy Technology Data Exchange (ETDEWEB)

    Arneaud, J.M.; Langman, R.A. [Tasmania Univ., Hobart, TAS (Australia)

    1995-12-31

    Large errors may occur if leakage path saturation is neglected when reduced-voltage test results are used to predict the direct-on-line starting current of induction motors. The results of applying three existing and two new methods for starting current prediction are compared with test data from 52 motors. A quantitative assessment is made of the probable reduction in error that would be achieved by increasing the number of available sets of reduced-voltage, locked rotor test results or by including slot design data. Guidelines are given for selecting an appropriate predictive method. (author). 4 tabs., 1 fig., 6 refs.

  20. [Acromegaly: current view].

    Science.gov (United States)

    Kršek, Michal

    2015-10-01

    Acromegaly is a rare disorder caused by autonomous oversecretion of growth hormone mostly by pituitary adenoma. Untreated acromegaly leads to significantly increased morbidity and mortality and impaired quality of life. Early diagnosis and treatment is therefore essential for improvement of patients prognosis and management of acromegaly should be concentrated in specialized centres. Present article summarizes current view on diagnosis and treatment of acromegaly.

  1. Perceived historical drinking norms and current drinking behavior: using the theory of normative social behavior as a framework for assessment.

    Science.gov (United States)

    Carcioppolo, Nick; Jensen, Jakob D

    2012-01-01

    Social norms are sustained and disseminated, both implicitly and explicitly, through the act of communication. As a result, communication researchers have sought to classify and target normative perceptions to enact social change. In line with this research, the current study investigated whether perceptions of past normative behavior, referred to here as historical norms, were significantly related to current behavior. Using the theory of normative behavior as a guiding framework, two studies were conducted to assess whether college student drinking behavior was related to one of two perceived historical drinking norms measures: historical consumption norms (i.e., the perceived percentage of students who drank over time) and historical tradition norms (i.e., the perception of drinking as a university tradition). Study 1 revealed that although historical consumption norms was not directly related to drinking behavior, it moderated the effect of descriptive norms on drinking behavior (p = .03). A full assessment of the theory of normative social behavior was conducted in study 2 to determine whether perceived historical drinking norms influenced behavior above and beyond both descriptive and injunctive norms. Findings demonstrated that historical tradition norms were significantly related to drinking behavior (p = .001), and marginally moderated the relationship between descriptive norms and drinking behavior (p = .09). These findings offer preliminary evidence in support of measuring perceived historical drinking norms in future campaigns and interventions designed to reduce drinking behavior.

  2. Investigation and Research on Current Economic Environment Problems in Rural Areas in More Developed Towns--Take Hu'nan Shaodong Liuze Town as an example%当前经济较发达地区农村乡镇环境问题的调查与研究--以湖南省邵东县流泽镇为例

    Institute of Scientific and Technical Information of China (English)

    陈波; 曾方荣

    2014-01-01

    With the development of urbanization, industrialization, the rural environment pollution problem increasingly prominent. In order to further understand the current rural environment pollution and treatment status. We have investigated the weeklong on Liu Ze town in Shao Dong County of Hunan province. Through the survey found that as the economy is relatively developed township rural pollution increasing, the performance in pollution sources is increasing, living garbage, pollutant treatment facilities and other issues, the cause of these problems is, etc. In view of the current rural environmental problems, the countermeasures we should strengthen management, strict law enforcement, increasing investment, to award to promote governance and the comprehensive improvement of multi-pronged.%随着城镇化、工业化发展,农村环境污染问题日益突出。为进一步了解当前农村环境污染和整治状况,我们对湖南省邵东县流泽镇进行了为期一星期的调查。通过调查发现,作为经济较发达乡镇农村污染不断加剧,表现在污染源日益增多、生活垃圾困扰大、污染物处理设施落后等问题,造成这些问题原因是多方面的。针对当前农村环境问题,解决对策应从加强管理、严格执法、加大投入、以奖促治、综合整治等多管齐下入手。

  3. Current practice for pulmonary hypertension

    Institute of Scientific and Technical Information of China (English)

    Toru Satoh

    2014-01-01

    Objective To investigate the current practice of pulmonary hypertension including current epidemiology,diagnosis and treatment.Data sources The review was based on data obtained from the published articles and guidelines.Study selection Articles with high level of evidence or current best evidence in each issue were selected to be reviewed.Results Overall prevalence of pulmonary hypertension was 0.3% to 6% with left heart disease occupying the most proportion,followed by pulmonary disease,pulmonary arterial hypertension and chronic thromboembolic pulmonary hypertension.In diagnosis,a flow diagram of diagnosis of pulmonary hypertension,differential diagnosis of pulmonary hypertension and how to determine the severity of pulmonary hypertension are explained including recent development of magnetic resonance imaging and gene abnormality study on bone morphogenetic protein receptor Ⅱ.In treatment,newlydeveloped pulmonary vasodilators and the way to use them are shown to treat pulmonary hypertension.Conclusion Safer and more effective treatment algorithm and basic researches and clinical trials are warranted to be explored.

  4. Current injection electrodes for electrical impedance tomography.

    Science.gov (United States)

    Armstrong, S; Jennings, D

    2004-08-01

    Current conveyors have been identified as a possible component within the current injection electrodes of an electrical impedance tomography system, where accurate current generation or precise measurement of the current injected is required. Several circuit configurations have been investigated through simulation to determine the most suitable to meet the specifications of the EIT system. A bipolar (floating source) circuit configuration employing the use of current conveyors has been designed, which achieves greater than 12 mA output current without saturation, over an accepted body impedance range. Simulations were performed over frequencies in excess of 1 MHz, and the output phase shift was less than 0.15 degrees up to 250 kHz, and 0.6 degrees up to 1 MHz.

  5. Marijuana: Current concepts

    Directory of Open Access Journals (Sweden)

    Donald eGreydanus

    2013-10-01

    Full Text Available Marijuana (cannabis remains a controversial drug in the 21st century. This paper considers current research on use of Cannabis sativa and its constituents such as the cannabinoids. Topics reviewed include prevalence of cannabis use, other drugs consumed with pot, the endocannabinoid system, use of medicinal marijuana, medical adverse effects of cannabis, and psychiatric adverse effects of cannabis use. Treatment of cannabis withdrawal and dependence is difficult and remains mainly based on psychological therapy; current research on pharmacologic management of problems related to cannabis consumption is also considered. The potential role of specific cannabinoids for medical benefit will be revealed as the 21st century matures. However, potential dangerous adverse effects from smoking marijuana are well known and should be clearly taught to a public often confused by a media-driven, though false message and promise of benign pot consumption.

  6. Marijuana: Current Concepts†

    Science.gov (United States)

    Greydanus, Donald E.; Hawver, Elizabeth K.; Greydanus, Megan M.; Merrick, Joav

    2013-01-01

    Marijuana (cannabis) remains a controversial drug in the twenty-first century. This paper considers current research on use of Cannabis sativa and its constituents such as the cannabinoids. Topics reviewed include prevalence of cannabis (pot) use, other drugs consumed with pot, the endocannabinoid system, use of medicinal marijuana, medical adverse effects of cannabis, and psychiatric adverse effects of cannabis use. Treatment of cannabis withdrawal and dependence is difficult and remains mainly based on psychological therapy; current research on pharmacologic management of problems related to cannabis consumption is also considered. The potential role of specific cannabinoids for medical benefit will be revealed as the twenty-first century matures. However, potential dangerous adverse effects from smoking marijuana are well known and should be clearly taught to a public that is often confused by a media-driven, though false message and promise of benign pot consumption. PMID:24350211

  7. Current management of presbyopia

    Directory of Open Access Journals (Sweden)

    Pandelis A Papadopoulos

    2014-01-01

    Full Text Available Presbyopia is a physiologic inevitability that causes gradual loss of accommodation during the fifth decade of life. The correction of presbyopia and the restoration of accommodation are considered the final frontier of refractive surgery. Different approaches on the cornea, the crystalline lens and the sclera are being pursued to achieve surgical correction of this disability. There are however, a number of limitations and considerations that have prevented widespread acceptance of surgical correction for presbyopia. The quality of vision, optical and visual distortions, regression of effect, complications such as corneal ectasia and haze, anisometropia after monovision correction, impaired distance vision and the invasive nature of the currently techniques have limited the utilization of presbyopia surgery. The purpose of this paper is to provide an update of current procedures available for presbyopia correction and their limitations.

  8. Current and future photovoltaics

    OpenAIRE

    Boreland, M.B.; Bagnall, D.M.

    2006-01-01

    Photovoltaics, now a billion-dollar industry, is experiencing staggering growth as increased concerns over fuel supply and carbon emissions have encouraged governments and environmentalists to become increasingly prepared to offset the extra cost of solar energy. Three 'generations' of photovoltaics have been envisaged that will take solar power into the mainstream. Photovoltaic production is currently 90% 'first-generation' or '1G' solar cells that rely on expensive bulk multi-crystalline or...

  9. Lubricated viscous gravity currents

    OpenAIRE

    Kowal, Katarzyna N.; Worster, M. Grae

    2015-01-01

    This is the author accepted manuscript. The final version is available via CUP at http://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=9553100&fileId=S0022112015000300. We present a theoretical and experimental study of viscous gravity currents lubricated by another viscous fluid from below. We use lubrication theory to model both layers as Newtonian fluids spreading under their own weight in two-dimensional and axisymmetric settings over a smooth rigid horizontal surfa...

  10. Clopidogrel Resistance: Current Issues

    Directory of Open Access Journals (Sweden)

    NS Neki

    2016-05-01

    Full Text Available Antiplatelet agents are mainly used in the prevention and management of atherothrombotic complications. Dual antiplatelet therapy, combining aspirin and clopidogrel, is the standard care for patients having acute coronary syndromes or undergoing percutaneous coronary intervention according to the current ACC/AHA and ESC guidelines. But in spite of administration of dual antiplatelet therapy, some patients develop recurrent cardiovascular ischemic events especially stent thrombosis which is a serious clinical problem. Antiplatelet response to clopidogrel varies widely among patients based on ex vivo platelet function measurements. Clopidogrel is an effective inhibitor of platelet activation and aggregation due to its selective and irreversible blockade of the P2Y12 receptor. Patients who display little attenuation of platelet reactivity with clopidogrel therapy are labeled as low or nonresponders or clopidogrel resistant. The mechanism of clopidogrel resistance remains incompletely defined but there are certain clinical, cellular and genetic factors including polymorphisms responsible for therapeutic failure. Currently there is no standardized or widely accepted definition of clopidogrel resistance. The future may soon be realised in the routine measurement of platelet activity in the same way that blood pressure, cholesterol and blood sugar are followed to help guide the therapy, thus improving the care for millions of people. This review focuses on the methods used to identify patients with clopidogrel resistance, the underlying mechanisms, metabolism, clinical significance and current therapeutic strategies to overcome clopidogrel resistance. J Enam Med Col 2016; 6(1: 38-46

  11. Turbulent current drive

    Science.gov (United States)

    Garbet, X.; Esteve, D.; Sarazin, Y.; Dif-Pradalier, G.; Ghendrih, P.; Grandgirard, V.; Latu, G.; Smolyakov, A.

    2014-11-01

    The Ohm's law is modified when turbulent processes are accounted for. Besides an hyper-resistivity, already well known, pinch terms appear in the electron momentum flux. Moreover it appears that turbulence is responsible for a source term in the Ohm's law, called here turbulent current drive. Two terms contribute to this source. The first term is a residual stress in the momentum flux, while the second contribution is an electro-motive force. A non zero average parallel wave number is needed to get a finite source term. Hence a symmetry breaking mechanism must be invoked, as for ion momentum transport. E × B shear flows and turbulence intensity gradients are shown to provide similar contributions. Moreover this source term has to compete with the collision friction term (resistivity). The effect is found to be significant for a large scale turbulence in spite of an unfavorable scaling with the ratio of the electron to ion mass. Turbulent current drive appears to be a weak effect in the plasma core, but could be substantial in the plasma edge where it may produce up to 10 % of the local current density.

  12. Turbidity Current Head Mixing

    Science.gov (United States)

    Hernandez, David; Sanchez, Miguel Angel; Medina, Pablo

    2010-05-01

    A laboratory experimental set - up for studying the behaviour of sediment in presence of a turbulent field with zero mean flow is compared with the behaviour of turbidity currents [1] . Particular interest is shown on the initiation of sediment motion and in the sediment lift - off. The behaviour of the turbidity current in a flat ground is compared with the zero mean flow oscilating grid generated turbulence as when wave flow lifts off suspended sediments [2,3]. Some examples of the results obtained with this set-up relating the height of the head of the turbidity current to the equilibrium level of stirred lutoclines are shown. A turbulent velocity u' lower than that estimated by the Shield diagram is required to start sediment motion. The minimum u' required to start sediment lift - off, is a function of sediment size, cohesivity and resting time. The lutocline height depends on u', and the vorticity at the lutocline seems constant for a fixed sediment size [1,3]. Combining grid stirring and turbidty current head shapes analyzed by means of advanced image analysis, sediment vertical fluxes and settling speeds can be measured [4,5]. [1] D. Hernandez Turbulent structure of turbidity currents and sediment transport Ms Thesis ETSECCPB, UPC. Barcelona 2009. [2] A. Sánchez-Arcilla; A. Rodríguez; J.C. Santás; J.M. Redondo; V. Gracia; R. K'Osyan; S. Kuznetsov; C. Mösso. Delta'96 Surf-zone and nearshore measurements at the Ebro Delta. A: International Conference on Coastal Research through large Scale Experiments (Coastal Dynamics '97). University of Plymouth, 1997, p. 186-187. [3] P. Medina, M. A. Sánchez and J. M. Redondo. Grid stirred turbulence: applications to the initiation of sediment motion and lift-off studies Physics and Chemistry of the Earth, Part B: Hydrology, Oceans and Atmosphere. 26, Issue 4, 2001, Pages 299-304 [4] M.O. Bezerra, M. Diez, C. Medeiros, A. Rodriguez, E. Bahia., A. Sanchez-Arcilla and J.M. Redondo. Study on the influence of waves on

  13. Current Status of University Library Websites Construction in China ---Based on the Investigation of University Student Users' Evaluation%我国高校图书馆网站建设现状研究——基于对学生用户使用评价的调查

    Institute of Scientific and Technical Information of China (English)

    尚新丽; 杨柳

    2012-01-01

    Based on a national questionnaire survey, the authors investigate and analyse the current status and satisfaction of university students in using university library websites from three perspectives: website design, website contents and website function. On the basis of statistics of the survey data which have been discussed, the authors put forward suggestions from many aspects, such as website marketing, language usage, guidance design, database construction, retrieval skills training, online consultation, and OPAC publitity, expecting to offer some reference information for the construction of university library websites.%以一次全国性问卷调查为基础,从网站设计、网站内容、网站功能三个角度对高校学生用户使用本校图书馆网站的现状及满意度评价进行调查分析,并在此基础上从网站营销、文辞运用、导引设计、数据库建设、检索技能培训、在线咨询、馆藏书目查询系统宣传等方面提出完善我国高校图书馆网站建设的建议。

  14. Translating chimpanzee personality to humans: Investigating the transportability of chimpanzee-derived personality scales to humans.

    Science.gov (United States)

    Latzman, Robert D; Sauvigné, Katheryn C; Hopkins, William D

    2016-06-01

    There is a growing interest in the study of personality in chimpanzees with repeated findings of a similar structure of personality in apes to that found in humans. To date, however, the direct translational value of instruments used to assess chimpanzee personality to humans has yet to be explicitly tested. As such, in the current study we sought to determine the transportability of factor analytically-derived chimpanzee personality scales to humans in a large human sample (N = 301). Human informants reporting on target individuals they knew well completed chimpanzee-derived and human-derived measures of personality from the two most widely studied models of human personality: Big Five and Big Three. The correspondence between informant-reported chimpanzee- and human-derived personality scales was then investigated. Results indicated high convergence for corresponding scales across most chimpanzee- and human-derived personality scales. Findings from the current study provide evidence that chimpanzee-derived scales translate well to humans and operate quite similarly to the established human-derived personality scales in a human sample. This evidence of transportability lends support to the translational nature of chimpanzee personality research suggesting clear relevance of this growing literature to humans. Am. J. Primatol. 78:601-609, 2016. © 2015 Wiley Periodicals, Inc.

  15. Photoinduced current and emission induced by current in a nanowire transistor: Temperature dependence

    Indian Academy of Sciences (India)

    Darehdor Mahvash Arabi; Shahtahmassebi Nasser

    2016-03-01

    In this paper, we present a theoretical study on a light emitting and current carrying nanosystem, in the nonzero temperature regime. The system under consideration is a semiconducting nanowire sandwiched between two semi-infinite metallic electrodes. The study was performed using the Keldysh nonequilibrium Green’s function method. We systematically investigate the photoinduced current and the light emission induced by this electronic current in the presence of gate voltage. The temperature dependence of these processes are also investigated in the temperature range of 3–300 K. Our study shows that, the photoinduced current is due to the transfer of electrons from highest occupied molecular orbital (HOMO) to the lowest unoccupied molecularorbital (LUMO). Thus, the separation of electron from the electron–hole pair creates a free electron which is responsible for the observed photoinduced current. The same conclusion is also arrived at for the reverse process of light emission under the influence of the electronic current.

  16. Stochastic longshore current dynamics

    Science.gov (United States)

    Restrepo, Juan M.; Venkataramani, Shankar

    2016-12-01

    We develop a stochastic parametrization, based on a 'simple' deterministic model for the dynamics of steady longshore currents, that produces ensembles that are statistically consistent with field observations of these currents. Unlike deterministic models, stochastic parameterization incorporates randomness and hence can only match the observations in a statistical sense. Unlike statistical emulators, in which the model is tuned to the statistical structure of the observation, stochastic parametrization are not directly tuned to match the statistics of the observations. Rather, stochastic parameterization combines deterministic, i.e physics based models with stochastic models for the "missing physics" to create hybrid models, that are stochastic, but yet can be used for making predictions, especially in the context of data assimilation. We introduce a novel measure of the utility of stochastic models of complex processes, that we call consistency of sensitivity. A model with poor consistency of sensitivity requires a great deal of tuning of parameters and has a very narrow range of realistic parameters leading to outcomes consistent with a reasonable spectrum of physical outcomes. We apply this metric to our stochastic parametrization and show that, the loss of certainty inherent in model due to its stochastic nature is offset by the model's resulting consistency of sensitivity. In particular, the stochastic model still retains the forward sensitivity of the deterministic model and hence respects important structural/physical constraints, yet has a broader range of parameters capable of producing outcomes consistent with the field data used in evaluating the model. This leads to an expanded range of model applicability. We show, in the context of data assimilation, the stochastic parametrization of longshore currents achieves good results in capturing the statistics of observation that were not used in tuning the model.

  17. The Weak Neutral Current

    CERN Document Server

    Erler, Jens

    2013-01-01

    This is a review of electroweak precision physics with particular emphasis on low-energy precision measurements in the neutral current sector of the electroweak theory and includes future experimental prospects and the theoretical challenges one faces to interpret these observables. Within the minimal Standard Model they serve as determinations of the weak mixing angle which are competitive with and complementary to those obtained near the Z-resonance. In the context of new physics beyond the Standard Model these measurements are crucial to discriminate between models and to reduce the allowed parameter space within a given model. We illustrate this for the minimal supersymmetric Standard Model with or without R-parity.

  18. ONLINE PUBLISHING CURRENT SCENARIO

    Directory of Open Access Journals (Sweden)

    Balasubramanian Thiagarajan

    2012-12-01

    Full Text Available This article attempts to unravel the current scenario in online publishing. Advent of internet has brought with it tremendous changes in the publishing industry. What was hither to an industry dominated by publisher has been thrown open to one and sundry. Online publishing has brought with it a reach which was hitherto never been imagined. In the normal course it would take at least a year to publish a manuscript. Online publishing has managed to bring this time down to a few weeks / at most a month. This article attempts to discusses the positives and perils of online publishing scenario.

  19. SBC Dark Current Measurement

    Science.gov (United States)

    Ogaz, Sara

    2013-10-01

    This takes a series of SBC dark measurements over a continuous period of about 6 hours {4 orbits}. The aim is to collect dark images during an extended SBC on-time. Earlier measurements indicate that the dark current increases with SBC on-time and may also be increasing with overall SBC use. The 6-hour time matches the longest time used by any observer. As with all SBC observations this needs continuous SAA free time.This program is executed once per cycle. The last exposures were taken in Mar 2013 under Program 13161.

  20. Current Conveyor Equivalent Circuits

    Directory of Open Access Journals (Sweden)

    Tejmal S. Rathore

    2012-02-01

    Full Text Available An equivalence between a class of (current conveyor CC II+ and CC II- circuits is established. CC IIequivalent circuit uses one extra element. However, under certain condition, the extra element can be eliminated. As an illustration of the application of this equivalence, minimal first and second order all-pass filters are derived. Incertain cases, it is possible to compensate the effect of the input resistor of CC at port X. At the end, an open problem of realizing an Nth order (N > 2 minimal all-pass filter is stated.

  1. Light Cone Current Algebra

    CERN Document Server

    Fritzsch, Harald

    2003-01-01

    This talk follows by a few months a talk by the same authors on nearly the same subject at the Coral Gables Conference. The ideas presented here are basically the same, but with some amplification, some change of viewpoint, and a number of new questions for the future. For our own convenience, we have transcribed the Coral Gables paper, but with an added ninth section, entitled "Problems of light cone current algebra", dealing with our present views and emphasizing research topics that require study.

  2. Generalized Quantum Current Algebras

    Institute of Scientific and Technical Information of China (English)

    ZHAO Liu

    2001-01-01

    Two general families of new quantum-deformed current algebras are proposed and identified both as infinite Hopf family of algebras, a structure which enables one to define "tensor products" of these algebras. The standard quantum affine algebras turn out to be a very special case of the two algebra families, in which case the infinite Hopf family structure degenerates into a standard Hopf algebra. The relationship between the two algebraic families as well as thefr various special examples are discussed, and the free boson representation is also considered.

  3. BLOCKING ALGORITHM FOR CURRENT PROTECTION DURING INRUSH MAGNETIZATION CURRENT

    Directory of Open Access Journals (Sweden)

    F. A. Romaniuk

    2014-01-01

    Full Text Available The paper presents blocking algorithm for current protection during inrush process. The algorithm is based on the evaluation of the ratio of the positive sequence second harmonic current to the negative sequence first harmonic current.

  4. Ionic currents and ion channels of lobster olfactory receptor neurons

    OpenAIRE

    1989-01-01

    The role of the soma of spiny lobster olfactory receptor cells in generating odor-evoked electrical signals was investigated by studying the ion channels and macroscopic currents of the soma. Four ionic currents; a tetrodotoxin-sensitive Na+ current, a Ca++ current, a Ca(++)-activated K+ current, and a delayed rectifier K+ current, were isolated by application of specific blocking agents. The Na+ and Ca++ currents began to activate at -40 to -30 mV, while the K+ currents began to activate at ...

  5. Influence of Current Transformer Saturation on Operation of Current Protection

    Directory of Open Access Journals (Sweden)

    F. A. Romaniouk

    2010-01-01

    Full Text Available An analysis of the influence of instrument current transformer errors on operation of current protection of power supply diagram elements has been carried out in the paper. The paper shows the influence of an aperiodic component of transient current and secondary load on current  transformer errors.Peculiar operational features of measuring elements of electromechanical and microprocessor current protection with their joint operation with electromagnetic current transformers have been analyzed in the paper.

  6. Swine brucellosis: current perspectives

    Directory of Open Access Journals (Sweden)

    Olsen SC

    2016-12-01

    Full Text Available SC Olsen, FM Tatum Infectious Bacterial Diseases of Livestock Research Unit, National Animal Disease Center, Agricultural Research Service, United States Department of Agriculture, Ames, IA, USA Abstract: Brucella suis is a significant zoonotic species that is present in domestic livestock and wildlife in many countries worldwide. Transmission from animal reservoirs is the source of human infection as human-to-human transmission is very rare. Although swine brucellosis causes economic losses in domestic livestock, preventing human infection is the primary reason for its emphasis in disease control programs. Although disease prevalence varies worldwide, in areas outside of Europe, swine brucellosis is predominantly caused by B. suis biovars 1 and 3. In Europe, swine are predominantly infected with biovar 2 which is much less pathogenic in humans. In many areas worldwide, feral or wild populations of swine are important reservoir hosts. Like other Brucella spp. in their natural host, B. suis has developed mechanisms to survive in an intracellular environment and evade immune detection. Limitations in sensitivity and specificity of current diagnostics require use at a herd level, rather for individual animals. There is currently no commercial vaccine approved for preventing brucellosis in swine. Although not feasible in all situations, whole-herd depopulation is the most effective regulatory mechanism to control swine brucellosis. Keywords: livestock, transmission, pathogenicity, vaccine, host, infection

  7. Current Ebola vaccines

    Science.gov (United States)

    Hoenen, Thomas; Groseth, Allison; Feldmann, Heinz

    2012-01-01

    Introduction Ebolaviruses cause severe viral hemorrhagic fever in humans and non-human primates, with case fatality rates of up to 90%. Currently, neither a specific treatment nor a vaccine licensed for use in humans is available. However, a number of vaccine candidates have been developed in the last decade that are highly protective in non-human primates, the gold standard animal model for Ebola hemorrhagic fever. Areas covered This review analyzes a number of scenarios for the use of ebolavirus vaccines, discusses the requirements for ebolavirus vaccines in these scenarios, and describes current ebolavirus vaccines. Among these vaccines are recombinant Adenoviruses, recombinant Vesicular Stomatitis viruses, recombinant Human Parainfluenza viruses and virus-like particles. Interestingly, one of these vaccine platforms, based on recombinant Vesicular Stomatitis viruses, has also demonstrated post-exposure protection in non-human primates. Expert opinion The most pressing remaining challenge is now to move these vaccine candidates forward into human trials and towards licensure. In order to achieve this, it will be necessary to establish the mechanisms and correlates of protection for these vaccines, and to continue to demonstrate their safety, particularly in potentially immunocompromised populations. However, already now there is sufficient evidence that, from a scientific perspective, a vaccine protective against ebolaviruses is possible. PMID:22559078

  8. Non-inductive current drive

    NARCIS (Netherlands)

    Westerhof, E.

    2012-01-01

    This lecture addresses the various ways of non-inductive current generation. In particular, the topics covered include the bootstrap current, RF current drive, neutral beam current drive, alternative methods, and possible synergies between different ways of non-inductive current generation.

  9. NON-INDUCTIVE CURRENT DRIVE

    NARCIS (Netherlands)

    Westerhof, E.

    2010-01-01

    This lecture addresses the various ways of non-inductive current generation. In particular, the topics covered include the bootstrap current, RF current drive, neutral beam current drive, alternative methods, and possible synergies between different ways of non-inductive current generation.

  10. Shaft MisalignmentDetectionusing Stator Current Monitoring

    OpenAIRE

    2013-01-01

    This paper inspects the misaligned of shaft by usingdiagnostic medium such as current and vibration.Misalignments in machines can cause decrease inefficiency and in the long-run it may cause failurebecause of unnecessary vibration, stress on motor,bearings and short-circuiting in stator and rotorwindings.In this study, authors investigate the onsetof instability on a shaft mounted on journal bearings.Shaft displacement and stator current samples duringmachine run up under misaligned condition...

  11. When less could be more: Investigating the effects of a brief internet-based imagery cognitive bias modification intervention in depression.

    Science.gov (United States)

    Pictet, A; Jermann, F; Ceschi, G

    2016-09-01

    Depression is a highly prevalent condition worldwide, yet multiple barriers to treatments means that the development of low intensive and easily accessible psychological interventions is crucially needed. The current study sought to investigate the efficacy of a brief, self-administered imagery cognitive bias modification (imagery CBM) procedure delivered online to a sample of 101 individuals with depressive symptoms. Compared to a closely matched control condition or a waitlist condition, imagery CBM led to greater improvements in depressive symptoms (d = 0.86, 95% CI = [0.33, 1.3] and d = 1.17, 95% CI = [0.62, 1.65]) interpretation bias and anhedonia. Despite the limitation to a two week follow-up, the study findings highlight the potential of imagery CBM as a brief, easily accessible intervention for depression that can be delivered remotely in peoples' home.

  12. Investigation on current status of stroke rehabilitation nursing knowledge of the young nurses in the department of neurology%神经内科年轻护士脑卒中康复护理知识认知水平的调查分析

    Institute of Scientific and Technical Information of China (English)

    岳高杰; 黄娟; 程瑞莲; 颜美霞

    2013-01-01

    Objective To understand the current cognition status of stroke rehabilitation nursing knowledge in young nurses of the department of neurology.Methods Self-designed questionnaires were used for investigating 273 young nurses between 20 and 30 years old of the department of neurology of 4 tertiary hospitals in Zhengzhou.Results The current status of stroke rehabilitation nursing knowledge of the nurses surveyed was generally at a low level.There were no significant differences among nurses with different education degrees,professional titles and whether their relatives suffered from stroke.However,there were significant differences among nurses with different professional lives and whether the department carried out rehabilitation care.Conclusions Nursing educators and managers need to find a new way to improve the level of stroke rehabilitation nursing knowledge of the young nurses.%目的 了解神经内科年轻护士对脑卒中康复护理知识的认知现状.方法 利用横断面调查法,采用自行设计问卷,对郑州市4所三级医院273名20~30岁的神经内科护士进行脑卒中康复护理知识认知水平的调查.结果 被调查的年轻护士的脑卒中康复护理知识认知水平普遍偏低.不同学历、不同职称年轻护士以及亲友有无罹患脑卒中对护士脑卒中康复护理知识的认知水平无显著影响.不同专业年限、科室是否开展康复护理对年轻护士脑卒中康复护理知识的认知有显著影响.结论 护理教育者及管理者亟需寻找对年轻护士进行脑卒中康复护理知识教育的有效途径,提高年轻护理人员的脑卒中康复护理知识认知水平.

  13. The gravimetric geodesy investigation

    Science.gov (United States)

    Siry, J. W.

    1971-01-01

    The Gravimetric Geodesy Investigation which will utilize altimeter and satellite-to-satellite tracking data from GEOS-C, ATS-F, and other spacecraft as appropriate to improve our knowledge of the earth's gravitational field is discussed. This investigation is interrelated with the study of oceanographic phenomena such as those associated with tides and currents, hence the latter are considered together with gravitational effects in the analysis of the data. The oceanographic effects, each of the order of a meter or two in amplitude and with still smaller uncertainties does not seriously hamper the altimeter gravimetric studies at the five meter level. Laser and satellite-to-satellite tracking data, when combined with the altimeter results, should provide the basis for such studies over wide areas of the ocean surface. Laser and conventional geodetic tracking data from ISAGEX and succeeding campaigns will provide a valuable framework for these analyses.

  14. Current Opinions on Tendinopathy

    Science.gov (United States)

    Kaux, Jean-François; Forthomme, Bénédicte; Goff, Caroline Le; Crielaard, Jean-Michel; Croisier, Jean-Louis

    2011-01-01

    Tendinopathy is characterized by pain in the tendon and impaired performance sometimes associated with swelling of the tendon. Its diagnosis is usually clinical but ultrasonography and magnetic resonance imaging can refine the diagnosis. Tendinopathy is highly prevalent and is one of the most frequently self reported musculoskeletal diseases in physical workers and sports people. Nevertheless, it is very difficult to carry out general epidemiologic studies on tendinopathy because of the varying sports cultures and sports habits in different countries. The aetiology of tendinopathy seems to be multi-factorial, involving intrinsic and extrinsic factors. The role of inflammation is still debated but the absence of inflammatory cells does not mean that inflammatory mediators are not implicated. Different theories have been advanced to explain pain and chronicity mechanisms, but these mechanisms remain largely unknown. “Conventional ”treatments are generally employed empirically to fight pain and inflammation but they do not modify the histological structure of the tendon. However, these treatments are not completely satisfactory and the recurrence of symptoms is common. Currently, eccentric training remains the treatment of choice for tendinopathy, even though some studies are contradictory. Moreover, many interesting new treatments are now being developed to treat tendinopathy, but there is little evidence to support their use in clinical practice. Key points The word “tendinopathy ”is the correct term for the clinical diagnosis of pain accompanied by impaired performance, and sometimes swelling in the tendon. The aetiology of tendinopathy seems to be a multi-factorial process, involving promoting factors that are intrinsic or extrinsic, working either alone or in combination. US (with color Doppler) and MRI are usually prescribed when tendinopathy is unresponsive to treatment and entails lingering symptoms. Eccentric training is currently considered to be the

  15. Current perspectives on reflux laryngitis.

    Science.gov (United States)

    Asaoka, Daisuke; Nagahara, Akihito; Matsumoto, Kenshi; Hojo, Mariko; Watanabe, Sumio

    2014-12-01

    Laryngopharyngeal reflux (LPR) is an extraesophageal manifestation of gastroesophageal reflux disease (GERD). With the increase of GERD patients, the importance of LPR is acknowledged widely. However, the pathophysiology of LPR is not understood completely and the diagnostic criteria for LPR remain controversial. Unfortunately, a gold standard diagnostic test for reflux laryngitis is not available. Recently, an experimental animal model for reflux laryngitis was developed to investigate the pathophysiology of reflux laryngitis. An empirical trial of lifestyle modification and proton pump inhibitor therapy is a reasonable approach for LPR symptoms. Alternatives after failure with aggressive medical treatment are limited and multichannel intraluminal impedance and pH monitoring is currently the best alternative to detect nonacid reflux. Additional prospective and evidence-based research is anticipated.

  16. Burnout current density of bismuth nanowires

    Science.gov (United States)

    Cornelius, T. W.; Picht, O.; Müller, S.; Neumann, R.; Völklein, F.; Karim, S.; Duan, J. L.

    2008-05-01

    Single bismuth nanowires with diameters ranging from 100nmto1μm were electrochemically deposited in ion track-etched single-pore polycarbonate membranes. The maximum current density the wires are able to carry was investigated by ramping up the current until failure occurred. It increases by three to four orders of magnitude for nanowires embedded in the template compared to bulk bismuth and rises with diminishing diameter. Simulations show that the wires are heated up electrically to the melting temperature. Since the surface-to-volume ratio rises with diminishing diameter, thinner wires dissipate the heat more efficiently to the surrounding polymer matrix and, thus, can tolerate larger current densities.

  17. Does bipolar pacemaker current activate blood platelets?

    DEFF Research Database (Denmark)

    Gjesdal, Grunde; Hansen, Annebirthe Bo; Brandes, Axel

    2009-01-01

    OBJECTIVE: The aim of this study was to investigate whether bipolar pacemaker current lead can activate blood platelets. The null hypothesis was that 1 minute of electrical stimulation of platelets would not influence their subsequent reactivity to adenosine diphosphate (ADP). BACKGROUND: Both...... platelets and muscle cells contain actin and myosin filaments, and both cells are activated following calcium influx. Muscle cells open their calcium channels and contract when exposed to an electric current. Current through a bipolar pacemaker lead will expose a small volume of blood, including platelets...

  18. Brain abscess: Current management

    Science.gov (United States)

    Alvis Miranda, Hernando; Castellar-Leones, Sandra Milena; Elzain, Mohammed Awad; Moscote-Salazar, Luis Rafael

    2013-01-01

    Brain abscess (BA) is defined as a focal infection within the brain parenchyma, which starts as a localized area of cerebritis, which is subsequently converted into a collection of pus within a well-vascularized capsule. BA must be differentiated from parameningeal infections, including epidural abscess and subdural empyema. The BA is a challenge for the neurosurgeon because it is needed good clinical, pharmacological, and surgical skills for providing good clinical outcomes and prognosis to BA patients. Considered an infrequent brain infection, BA could be a devastator entity that easily left the patient into dead. The aim of this work is to review the current concepts regarding epidemiology, pathophysiology, etiology, clinical presentation, diagnosis, and management of BA. PMID:24174804

  19. Current Automotive Holometry Studies

    Science.gov (United States)

    Marchi, Mitchell M.; Snyder, D. S.

    1990-04-01

    Holometry studies of automotive body and powertrain components have become a very useful high resolution test methodology to knowledgeable Ford engineering personnel. Current examples of studies that represent the static or dynamic operational conditions of the automotive test component are presented. Continuous wave laser holometry, computer aided holometry (CAH) and pulsed laser holometry were the holometric techniques used to study the following subjects: (1) body in prime (BIP) vibration modes, (2) transmission flexplate stud-torque converter deformation due to engine torque pulses, (3) engine cylinder head and camshaft support structure deformation due to cylinder pressure and (4) engine connecting rod/cap lift-off. Static and dynamic component loading and laboratory techniques required to produce usable and valid test results are discussed along with possible conclusions for the engineering concerns.

  20. Perihilar cholangiocarcinoma: Current therapy

    Institute of Scientific and Technical Information of China (English)

    Wei; Zhang; Lu-Nan; Yan

    2014-01-01

    Perihilar cholangiocarcinoma, which is a rare primary malignancy, originates from the epithelial cells of the bile duct. Usually invading the periductal tissues and the lymph nodes, perihilar cholangiocarcinoma is commonly diagnosed in the advanced stage of the disease and has a dismal prognosis. Currently, complete hepatectomy is the primary therapy for curing this disease. Perioperative assessment and available surgical procedures can be considered for achieving a negative margin resection, which is associated with long-term survival and better quality of life. For patients with unresectable cholangiocarcinoma, several palliative treatments have been demonstrated to produce a better outcome; and liver transplantation for selected patients with perihilar cholangiocarcinoma is promising and desirable. However, the role of palliative treatments and liver transplantation was controversial and requires more evidence and substantial validity from multiple institutions. In this article, we summarize the data from multiple institutions and discuss the resectability, mortality, morbidity and outcome with different approaches.

  1. Brain abscess: Current management

    Directory of Open Access Journals (Sweden)

    Hernando Alvis-Miranda

    2013-01-01

    Full Text Available Brain abscess (BA is defined as a focal infection within the brain parenchyma, which starts as a localized area of cerebritis, which is subsequently converted into a collection of pus within a well-vascularized capsule. BA must be differentiated from parameningeal infections, including epidural abscess and subdural empyema. The BA is a challenge for the neurosurgeon because it is needed good clinical, pharmacological, and surgical skills for providing good clinical outcomes and prognosis to BA patients. Considered an infrequent brain infection, BA could be a devastator entity that easily left the patient into dead. The aim of this work is to review the current concepts regarding epidemiology, pathophysiology, etiology, clinical presentation, diagnosis, and management of BA.

  2. Misophonia: current perspectives

    Directory of Open Access Journals (Sweden)

    Cavanna AE

    2015-08-01

    Full Text Available Andrea E Cavanna,1–3 Stefano Seri3,4 1Department of Neuropsychiatry, Birmingham and Solihull Mental Health NHS Foundation Trust and University of Birmingham, Birmingham, 2Sobell Department of Motor Neuroscience and Movement Disorders, Institute of Neurology, University College London, London, 3School of Life and Health Sciences, Aston Brain Centre, Wellcome Trust Laboratory for MEG Studies, Aston University, 4Children’s Epilepsy Surgery Programme, The Birmingham Children’s Hospital NHS Foundation Trust, Birmingham, UK Abstract: Misophonia is characterized by a negative reaction to a sound with a specific pattern and meaning to a given individual. In this paper, we review the clinical features of this relatively common yet underinvestigated condition, with focus on co-occurring neurodevelopmental disorders. Currently available data on the putative pathophysiology of the condition can inform our understanding and guide the diagnostic process and treatment approach. Tinnitus retraining therapy and cognitive behavior therapy have been proposed as the most effective treatment strategies for reducing symptoms; however, current treatment algorithms should be validated in large population studies. At the present stage, competing paradigms see misophonia as a physiological state potentially inducible in any subject, an idiopathic condition (which can present with comorbid psychiatric disorders, or a symptomatic manifestation of an underlying psychiatric disorder. Agreement on the use of standardized diagnostic criteria would be an important step forward in terms of both clinical practice and scientific inquiry. Areas for future research include phenomenology, epidemiology, modulating factors, neurophysiological underpinnings, and treatment trials. Keywords: misophonia, selective sound sensitivity syndrome, hyperacusis, neurodevelopmental disorders, Tourette syndrome, obsessive-compulsive spectrum

  3. Extreme geomagnetically induced currents

    Science.gov (United States)

    Kataoka, Ryuho; Ngwira, Chigomezyo

    2016-12-01

    We propose an emergency alert framework for geomagnetically induced currents (GICs), based on the empirically extreme values and theoretical upper limits of the solar wind parameters and of d B/d t, the time derivative of magnetic field variations at ground. We expect this framework to be useful for preparing against extreme events. Our analysis is based on a review of various papers, including those presented during Extreme Space Weather Workshops held in Japan in 2011, 2012, 2013, and 2014. Large-amplitude d B/d t values are the major cause of hazards associated with three different types of GICs: (1) slow d B/d t with ring current evolution (RC-type), (2) fast d B/d t associated with auroral electrojet activity (AE-type), and (3) transient d B/d t of sudden commencements (SC-type). We set "caution," "warning," and "emergency" alert levels during the main phase of superstorms with the peak Dst index of less than -300 nT (once per 10 years), -600 nT (once per 60 years), or -900 nT (once per 100 years), respectively. The extreme d B/d t values of the AE-type GICs are 2000, 4000, and 6000 nT/min at caution, warning, and emergency levels, respectively. For the SC-type GICs, a "transient alert" is also proposed for d B/d t values of 40 nT/s at low latitudes and 110 nT/s at high latitudes, especially when the solar energetic particle flux is unusually high.

  4. Ocular tuberculosis: current perspectives

    Directory of Open Access Journals (Sweden)

    Shakarchi FI

    2015-11-01

    Full Text Available Faiz I Shakarchi1,21Ibn Al-Haetham Teaching Eye Hospital, 2Department of Opthalmology, Medical College, Al-Mustansiriya University, Baghdad, IraqAbstract: The World Health Organization currently estimates that nearly two billion people, or one-third of the world’s population, are infected by tuberculosis, and that roughly 10% of the infected people are symptomatic. Tuberculosis affects the lungs in 80% of patients, while in the remaining 20% the disease may affect other organs, including the eye. Uveitis can be seen concurrently with tuberculosis, but a direct association is difficult to prove. Ocular tuberculosis is usually not associated with clinical evidence of pulmonary tuberculosis, as up to 60% of extrapulmonary tuberculosis patients may not have pulmonary disease. The diagnosis of tuberculous uveitis is often problematic and in nearly all reported cases, the diagnosis was only presumptive. Tuberculous uveitis is a great mimicker of various uveitis entities and it can be considered in the differential diagnosis of any type of intraocular inflammation. It is still unknown if ocular manifestations result from a direct mycobacterium infection or hypersensitivity reaction and this is reflected on the management of tuberculous uveitis. Prevalence of tuberculosis as an etiology of uveitis may reach up to 10% in endemic areas. Tuberculous uveitis is a vision-threatening disease that inevitably leads to blindness if not properly diagnosed and treated. The aim of this review is to illustrate the various clinical features and management of presumed tuberculous uveitis. The current review focuses on the diagnostic criteria, significance of tuberculin skin test, and use of systemic corticosteroids in the management of tuberculous uveitis as recommended in recent publications.Keywords: tuberculosis, uveitis, choroiditis, tuberculin skin test

  5. Current status of Japanese detectors

    CERN Document Server

    Tatsumi, Daisuke; Arai, Koji; Nakagawa, Noriyasu; Agatsuma, Kazuhiro; Yamazaki, Toshitaka; Fukushima, Mitsuhiro; Fujimoto, Masa-Katsu; Takamori, Akiteru; Bertolini, Alessandro; Sannibale, Virginio; DeSalvo, Riccardo; Marka, Szabolcs; Ando, Masaki; Tsubono, Kimio; Akutsu, Tomomi; Yamamoto, Kazuhiro; Ishitsuka, Hideki; Uchiyama, Takashi; Miyoki, Shinji; Ohashi, Masatake; Kuroda, Kazuaki; Awaya, Norichika; Kanda, Nobuyuki; Araya, Akito; Telada, Souichi; Tomaru, Takayuki; Haruyama, Tomiyoshi; Yamamoto, Akira; Sato, Nobuaki; Suzuki, Toshitaka; Shintomi, Takakazu

    2007-01-01

    Current status of TAMA and CLIO detectors in Japan is reported in this article. These two interferometric gravitational-wave detectors are being developed for the large cryogenic gravitational wave telescope (LCGT) which is a future plan for detecting gravitational wave signals at least once per year. TAMA300 is being upgraded to improve the sensitivity in low frequency region after the last observation experiment in 2004. To reduce the seismic noises, we are installing new seismic isolation system, which is called TAMA Seismic Attenuation System, for the four test masses. We confirmed stable mass locks of a cavity and improvements of length and angular fluctuations by using two SASs. We are currently optimizing the performance of the third and fourth SASs. We continue TAMA300 operation and R&D studies for LCGT. Next data taking in the summer of 2007 is planned. CLIO is a 100-m baseline length prototype detector for LCGT to investigate interferometer performance in cryogenic condition. The key features of...

  6. Gravity currents at Ormen Lange

    Energy Technology Data Exchange (ETDEWEB)

    Vikeboe, Frode; Berntsen, Jarle; Furnes, Gunnar

    2001-12-01

    Time series of temperature and velocities at Ormen Lange, located in the Storegga region off mid-Norway, indicate that close to the seabed, at depths ranging from 500-1000 m, large temperature fluctuations are accompanied by short peak values in speed. The extreme events are driven by strong pressure gradients, due to strong atmospheric low pressures and/or internal pressure fronts between warmer Atlantic Water (AW) and colder Norwegian Sea Water (NSW). Along the shelf slope at OL we may get steepening of the iso surfaces of density, separating AW and NSW, due to strong Ekman veering during storms or approaching internal density fronts. During such events the density surfaces tend to undershoot their equilibrium level, and as the forcing weakens, the suppressed water may run up along the shelf slope. In this run up phase, peak values in the velocities are often found. As a result of the run up phase, heavy water may be elevated onto the shelf. Subsequently dense fluid will spread under the influence of forces produced by its own buoyancy and motions of this form are often referred to as gravity currents. They are characterised by the distinctive nature of the front, which consists of a raised head leading a shallower flow behind. The shape of the head and body of the gravity current, along with velocity, depend on a range of parameters. This report investigates the velocities that may occur with parameters of relevance for Ormen Lange. (author)

  7. Current treatments for radiation retinopathy

    Energy Technology Data Exchange (ETDEWEB)

    Giuliari, Gian Paolo; Simpson, E. Rand (Princess Margaret Hospital, Univ. of Toronto, Dept. of Ophthalmology and Vision Sciences, Toronto (Canada)), e-mail: gpgiuliari@gmail.com; Sadaka, Ama (Schepens Eye Research Inst., Boston, MA (United States)); Hinkle, David M. (Massachusetts Eye Research and Surgery Institution, Cambridge, MA (United States))

    2011-01-15

    Background. To review the currently available therapeutic modalities for radiation retinopathy (RR), including newer investigational interventions directed towards specific aspects of the pathophysiology of this refractory complication. Methods. A review of the literature encompassing the pathogenesis of RR and the current therapeutic modalities available was performed. Results. RR is a chronic and progressive condition that results from exposure to any source of radiation. It might be secondary to radiation treatment of intraocular tumors such as choroidal melanomas, retinoblastomas, and choroidal metastasis, or from unavoidable exposure to excessive radiation from the treatment of extraocular tumors like cephalic, nasopharyngeal, orbital, and paranasal malignancies. After the results of the Collaborative Ocular Melanoma Study, most of the choroidal melanomas are being treated with plaque brachytherapy increasing by that the incidence of this radiation complication. RR has been reported to occur in as many as 60% of eyes treated with plaque radiation, with higher rates associated with larger tumors. Initially, the condition manifests as a radiation vasculopathy clinically seen as microaneurysms and telangiectasis, with posterior development of retinal hard exudates and hemorrhages, macular edema, neovascularization and tractional retinal detachment. Regrettably, the management of these eyes remains limited. Photodynamic therapy, laser photocoagulation, oral pentoxyphylline and hyperbaric oxygen have been attempted as treatment modalities with inconclusive results. Intravitreal injections of anti-vascular endothelial growth factor such as bevacizumab, ranibizumab and pegaptanib sodium have been recently used, also with variable results. Discussion. RR is a common vision threatening complication following radiation therapy. The available therapeutic options are limited and show unsatisfactory results. Further large investigative studies are required for developing

  8. Current status of validation for robotic surgery simulators - a systematic review.

    Science.gov (United States)

    Abboudi, Hamid; Khan, Mohammed S; Aboumarzouk, Omar; Guru, Khurshid A; Challacombe, Ben; Dasgupta, Prokar; Ahmed, Kamran

    2013-02-01

    To analyse studies validating the effectiveness of robotic surgery simulators. The MEDLINE(®), EMBASE(®) and PsycINFO(®) databases were systematically searched until September 2011. References from retrieved articles were reviewed to broaden the search. The simulator name, training tasks, participant level, training duration and evaluation scoring were extracted from each study. We also extracted data on feasibility, validity, cost-effectiveness, reliability and educational impact. We identified 19 studies investigating simulation options in robotic surgery. There are five different robotic surgery simulation platforms available on the market. In all, 11 studies sought opinion and compared performance between two different groups; 'expert' and 'novice'. Experts ranged in experience from 21-2200 robotic cases. The novice groups consisted of participants with no prior experience on a robotic platform and were often medical students or junior doctors. The Mimic dV-Trainer(®), ProMIS(®), SimSurgery Educational Platform(®) (SEP) and Intuitive systems have shown face, content and construct validity. The Robotic Surgical SimulatorTM system has only been face and content validated. All of the simulators except SEP have shown educational impact. Feasibility and cost-effectiveness of simulation systems was not evaluated in any trial. Virtual reality simulators were shown to be effective training tools for junior trainees. Simulation training holds the greatest potential to be used as an adjunct to traditional training methods to equip the next generation of robotic surgeons with the skills required to operate safely. However, current simulation models have only been validated in small studies. There is no evidence to suggest one type of simulator provides more effective training than any other. More research is needed to validate simulated environments further and investigate the effectiveness of animal and cadaveric training in robotic surgery.

  9. Instantaneous Current Feedback Control Strategy on Buck Mode Inverter

    Institute of Scientific and Technical Information of China (English)

    2011-01-01

    Control strategies for Buck mode inverter have important effect on static and dynamic characteristics, reliability, load capacity, and short-circuit resistance. Instantaneous current feedback control strategies include instantaneous inductor current feedback control and instantaneous capacitor current feedback control, both of which have essential difference. When the Buck mode inverter respectively adopts instantaneous inductor current and capacitor current feedback control strategies, characteristics of stability, output voltage and power, short circuit, nonlinear load and dynamic are fully investigated in this paper.

  10. 医护人员性健康指导知信行状况及其影响因素%Investigation of current status of the knowledge, attitude and practice of medical staff on sexual health guidance and analysis of influence factors

    Institute of Scientific and Technical Information of China (English)

    何平; 张安琴; 张蒙

    2012-01-01

    Objective To investigate the current status of knowledge, attitude and practice (KAP) of medical staff among different clinic unit on sexual health guidance,and analyze the influence factors. Methods A self-devetoped KAP questionnaire for medical staff was used, and 460 medical personnel in Chengdu city were investigated. The data were statistically analyzed. Results The scores of KAP of sexual health guidance were tow. There was a significant difference in KAP among different clinic units ( F = l. 063 , 6.746,7.618 for knowledge,attitude and practice,respectively;all P<0. 001) with the best in the department of gynaecotogy. The primary influence factor for guidance behavior was that the patients lacked consulting knowledge. The secondary factor was that medical staff lacked sexual knowledge. Conclusion The most clinical medical staff lack knowledge of sexual health guidance and ignore patients' sexual health problems. The guidance behavior is also limited. Therefore,it will be a tong way for sexual health guidance.%目的 了解医护人员对患者性健康指导现状,分析性健康指导知信行的影响因素.方法 自行设计问卷调查表,调查460名临床医护人员的性健康指导知信情况,并对数据进行分析统计.结果 医护人员对患者性健康指导的知信行分值均偏低;不同科室医护人员在性健康指导知识、态度和行为方面存在差异(F值分别为7.063、6.746和7.618,均P<0.001),妇科在性健康指导方面做得最好(P<0.01);影响健康指导行为的首要因素是没有患者咨询性知识,其次为医护人员性知识缺乏.结论 临床科室医护人员普遍存在性健康指导知识缺乏、忽视患者性健康问题、健康行为受限的诸多问题.性健康教育任重道远.

  11. Investigations of Quantum Backflow

    CERN Document Server

    Yearsley, J M; Hartshorn, R; Whitby, A

    2012-01-01

    We investigate the backflow effect in elementary quantum mechanics -- the phenomenon in which a state consisting entirely of positive momenta may have negative current and the probability flows in the opposite direction to the momentum. We discuss various measurement models in which backflow may be seen in certain measurable probabilities. We compute the current and flux for states consisting of superpositions of gaussian wave packets. These are experimentally realizable but the amount of backflow is small. Inspired by the numerical results of Penz et al, we find two non-trivial wave functions whose current at any time may be computed analytically and which have periods of significant backflow, in one case with a backwards flux equal to about 70 percent of the maximum possible backflow, a dimensionless number $c_{bm} \\approx 0.04 $, discovered by Bracken and Melloy. This number has the unusual property of being independent of $\\hbar$ (and also of all other parameters of the model), despite corresponding to an...

  12. Leadership, Motivation, and Teamwork Behaviors of Principal Investigator's in Interdisciplinary Teams: A Synthesis of Research

    Science.gov (United States)

    Adams, Brittany L.; Cain, Holly Reed; Giraud, Vivana; Stedman, Nicole L. P.

    2012-01-01

    Increased demand, limited resources, knowledge gaps, and seemingly less time to produce results are the challenges facing researchers and others in higher education today. Working together across disciplines is almost a requirement to stay afloat in the competitive arena most principal investigators are finding themselves in. This study sought to…

  13. Quality Assurance in Software Development: An Exploratory Investigation in Software Project Failures and Business Performance

    Science.gov (United States)

    Ichu, Emmanuel A.

    2010-01-01

    Software quality is perhaps one of the most sought-after attributes in product development, however; this goal is unattained. Problem factors in software development and how these have affected the maintainability of the delivered software systems requires a thorough investigation. It was, therefore, very important to understand software…

  14. Trust in Leadership: Investigation of Andragogical Learning and Implications for Student Placement Outcomes

    Science.gov (United States)

    Gillespie, LaVerne

    2014-01-01

    Purpose. The investigation sought to determine the significance and or the effects of an ex post facto staffing intervention involving the addition of a Regional (mid-tier) team of instructional leaders as a viable and sustainable solution for increased operational effectiveness year over year, and, if there could be implications on employment…

  15. The Digital Literacy Debate: An Investigation of Digital Propensity and Information and Communication Technology

    Science.gov (United States)

    Nasah, Angelique; DaCosta, Boaventura; Kinsell, Carolyn; Seok, Soonhwa

    2010-01-01

    Research suggests students' use of information and communication technology (ICT) may be more a matter of digital literacy and access rather than a generational trait. We sought to identify ICT preferences of post-secondary students (N = 580) through a Digital Propensity Index (DPI), investigating communication methods, Internet practices and the…

  16. The Digital Literacy Debate: An Investigation of Digital Propensity and Information and Communication Technology

    Science.gov (United States)

    Nasah, Angelique; DaCosta, Boaventura; Kinsell, Carolyn; Seok, Soonhwa

    2010-01-01

    Research suggests students' use of information and communication technology (ICT) may be more a matter of digital literacy and access rather than a generational trait. We sought to identify ICT preferences of post-secondary students (N = 580) through a Digital Propensity Index (DPI), investigating communication methods, Internet practices and the…

  17. Investigation of Mathematics Teachers Conceptualisation of the Spiritual, Moral, Social and Cultural Role of Mathematics

    Science.gov (United States)

    Agashi, Pius P.; Enemali, I. A.

    2015-01-01

    The study sought to investigate mathematics teachers' conceptualization of the spiritual, moral social and cultural (SMSC) role of mathematics in Ankpa Education Zone of Kogi State. It used a purposive sample of all the 82 mathematics teachers in the zone comprising of 64 male and 18 female. The instrument used for the study was SMSC Role of…

  18. Investigation of Critical Attributes of Mathematics Software Intended for Use by Young Children

    Science.gov (United States)

    Varol, Filiz; Colburn, Linda K.

    2007-01-01

    The purpose of this study was to investigate the critical attributes of mathematical software designed for children between the ages of four and seven. This study sought to offer guidelines that will assist software designers in the design of developmentally appropriate educational software. In addition, teachers and parents may benefit from this…

  19. Quality Assurance in Software Development: An Exploratory Investigation in Software Project Failures and Business Performance

    Science.gov (United States)

    Ichu, Emmanuel A.

    2010-01-01

    Software quality is perhaps one of the most sought-after attributes in product development, however; this goal is unattained. Problem factors in software development and how these have affected the maintainability of the delivered software systems requires a thorough investigation. It was, therefore, very important to understand software…

  20. 失依儿童家庭寄养的现状、问题与对策——基于对广西A儿童福利院的考察%Current Situation, Problems and Countermeasures: Affairs of Family Foster Care for Dependent Children --Based on investigation of a welfare home for children in Guangxi

    Institute of Scientific and Technical Information of China (English)

    罗德红; 谢敏慧

    2012-01-01

    儿童福利院家庭寄养的现状表明,家庭寄养尚未成为主流,其解决问题的核心理念是“儿童福利社会化”,具体对策是:扩大家庭寄养儿童的对象,配合八部委“城市街面力争实现无流浪未成年人”的工作;提高百姓对家庭寄养的知晓度和参与度;构建多级多元管理体系,建立社区失依儿童接收点;创立公开透明的网络以联结多元多级管理体系。%The investigation of the current situation of A Welfare Home for Children in Guangxi shows that family foster care hasn't been the mainstream to care for dependent children. The core idea used to solve it is to embrace the idea of socialization of children welfare. The concrete measures are the following: expand the range of dependent children in family foster care, and coordinate the efforts of the eight ministries and commissions to find homes for every immature wanderer; increase the degree of people's knowledge and participation to family foster care; construct the multileveled and muhiagency administration system; set up acceptance points for dependent children in communities; establish open and transparent internet websites for the multileveled and multiagency administration system.