WorldWideScience

Sample records for night float system

  1. Residents' perceptions of a night float system

    Directory of Open Access Journals (Sweden)

    Granieri Rosanne

    2009-08-01

    Full Text Available Abstract Background A Night Float (NF system has been implemented by many institutions to address increasing concerns about residents' work hours. The purpose of our study was to examine the perceptions of residents towards a NF system. Methods A 115-item questionnaire was developed to assess residents' perceptions of the NF rotation as compared with a regular call month. The categories included patient care, education, medical errors, and overall satisfaction. Internal Medicine housestaff (post-graduate years 1–3 from three hospital settings at the University of Pittsburgh completed the questionnaire. Results The response rate was 90% (n = 149. Of these, 74 had completed the NF rotation. The housestaff felt that the quality of patient care was improved because of NF (41% agreed and 18% disagreed. A majority also felt that better care was provided by a rested physician in spite of being less familiar with the patient (46% agreed and 21% disagreed. Most felt that there was less emphasis on education (65% and more emphasis on service (52% during NF. Overall, the residents felt more rested during their call months (83% and strongly supported the 80-hour workweek requirement (77%. Conclusion Housestaff felt that the overall quality of patient care was improved by a NF system. The perceived improved quality of care by a rested physician coupled with a perceived decrease in the emphasis on education may have significant implications in housestaff training.

  2. Resident perceptions of the educational value of night float rotations.

    Science.gov (United States)

    Luks, Andrew M; Smith, C Scott; Robins, Lynne; Wipf, Joyce E

    2010-07-01

    Night float rotations are being increasingly used in the era of resident physician work-hour regulations, but their impact on resident education is not clear. Our objective was to clarify resident perceptions of the educational aspects of night float rotations. An anonymous survey of internal medicine residents at a university-based residency program was completed. Responses were received from 116 of 163 surveyed residents (71%). Residents attended less residents' report (0.10 +/- .43 vs. 2.70 + 0.93 sessions/week, pvalue of night float, sleep cycle adjustment issues, and impact on their personal lives, which correlated with resident evaluations from the regular program evaluation process. In free responses, residents commented that they liked the autonomy and opportunity to improve triage skills on these rotations and confirmed their negative opinions about the sleep-wake cycle and interference with personal lives. Internal medicine residents at a university-based program have negative opinions regarding the educational value of night float rotations. Further work is necessary to determine whether problems exist across programs and specialties.

  3. Perceptions of a night float system of resident call within an obstetrics and gynaecology residency training program.

    Science.gov (United States)

    Shirreff, Lindsay; Shapiro, Jodi L; Yudin, Mark H

    2014-11-01

    Objectif : Déterminer les attitudes des résidents, des obstétriciens traitants et du personnel infirmier envers la mise en œuvre d’un système d’équipes de garde de nuit (night float) pour les résidents, par comparaison avec un système traditionnel de garde de 24 heures. Méthodes : En juin 2012, nous avons demandé à des résidents en obstétrique-gynécologie de l’Université de Toronto qui avaient participé tant à un système d’équipes de garde de nuit qu’à un système de garde de 24 heures de remplir un questionnaire électronique. Les obstétriciens traitants et le personnel infirmier de la salle de travail et d’accouchement de deux hôpitaux de soins tertiaires comptant un système d’équipes de garde de nuit en ce qui concerne les résidents ont rempli des questionnaires électroniques et en version papier, respectivement. Ces questionnaires demandaient aux répondants de comparer les deux systèmes de garde en ce qui a trait au moral des résidents, à leur fatigue et à la continuité des soins offerts, et d’indiquer lequel de ces deux systèmes ils préféraient. Résultats : Des questionnaires ont été remplis par 20/24 résidents (83 %), 24/39 obstétriciens traitants (62 %) et 47/58 infirmières (81 %). La plupart des résidents ont signalé une fatigue moindre (17/20, 85 %) et une amélioration de la continuité des soins (15/20, 75 %) dans le cadre du système d’équipes de garde de nuit; toutefois, les réponses quant au moral ont été mixtes. De façon globale, 14/20 (70 %) résidents ont préféré le système d’équipes de garde de nuit. Les perceptions du personnel quant à ce dernier ont été mixtes dans tous les domaines; de plus, la plupart des membres du personnel n’ont signalé aucune différence en ce qui concerne le moral des résidents (17/24, 71 %). Les infirmières ont estimé que les résidents étaient moins fatigués (32/47, 68 %) et qu’il était plus facile de travailler avec

  4. Use of a Night Float System to Comply With Resident Duty Hours Restrictions: Perceptions of Workplace Changes and Their Effects on Professionalism.

    Science.gov (United States)

    Sun, Ning-Zi; Gan, Runye; Snell, Linda; Dolmans, Diana

    2016-03-01

    Although some evidence suggests that resident duty hours reforms can lead to shift-worker mentality and loss of patient ownership, other evidence links long hours and fatigue to poor work performance and loss of empathy, suggesting the restrictions could positively affect professionalism. The authors explored perceived impacts of a 16-hour duty restriction, achieved using a night float (NF) system, on the workplace and professionalism. In 2013, the authors conducted semistructured interviews with 18 residents, 9 staff physicians, and 3 residency program directors in the McGill University core internal medicine residency program regarding their perceptions of the program's 12-hour shift-based NF system. Interviews were transcribed and coded for common themes. The authors used a descriptive qualitative methodology. Participants viewed implementation of the NF system as leading to decreased physical and mental exhaustion, more consistent interaction with patients, and more stable team structure within shifts compared with the previous 24-hour call system. These workplace changes were felt to improve teamwork and patient ownership within shifts, quality of work performed, and empathy. Across shifts, however, more frequent sign-overs, stricter application of shift time boundaries, and loose integration between daytime and NF teams were perceived as leading to emergence of shift-worker mentality around sign-over. Perceptions of optimal patient ownership changed from the traditional single-physician-24/7 model to team-based shared ownership. Duty hours restrictions, as exemplified by an NF system, have both positive and negative impacts on professionalism. Interventions and training toward effective team-based care are needed to curb emergence of shift-worker mentality.

  5. Nightly Test system migration

    CERN Document Server

    Win-Lime, Kevin

    2013-01-01

    The summer student program allows students to participate to the Cern adventure. They can follow several interesting lectures about particle science and participate to the experiment work. As a summer student, I had worked for LHCb experiment. LHCb uses a lot of software to analyze its data. All this software is organized in packages and projects. They are built and tested during the night using an automated system and the results are displayed on a web interface. Actually, LHCb is changing this system. It is looking for a replacement candidate. So I was charged to unify some internal interfaces to permit a swift migration. In this document, I will describe shortly the system used by LHCb, then I will explain what I have done in detail.

  6. ATLAS Nightly Build System Upgrade

    CERN Document Server

    Dimitrov, G; The ATLAS collaboration; Simmons, B; Undrus, A

    2014-01-01

    The ATLAS Nightly Build System is a facility for automatic production of software releases. Being the major component of ATLAS software infrastructure, it supports more than 50 multi-platform branches of nightly releases and provides ample opportunities for testing new packages, for verifying patches to existing software, and for migrating to new platforms and compilers. The Nightly System testing framework runs several hundred integration tests of different granularity and purpose. The nightly releases are distributed and validated, and some are transformed into stable releases used for data processing worldwide. The first LHC long shutdown (2013-2015) activities will elicit increased load on the Nightly System as additional releases and builds are needed to exploit new programming techniques, languages, and profiling tools. This paper describes the plan of the ATLAS Nightly Build System Long Shutdown upgrade. It brings modern database and web technologies into the Nightly System, improves monitoring of nigh...

  7. ATLAS Nightly Build System Upgrade

    CERN Document Server

    Dimitrov, G; The ATLAS collaboration; Simmons, B; Undrus, A

    2013-01-01

    The ATLAS Nightly Build System is a facility for automatic production of software releases. Being the major component of ATLAS software infrastructure, it supports more than 50 multi-platform branches of nightly releases and provides ample opportunities for testing new packages, for verifying patches to existing software, and for migrating to new platforms and compilers. The Nightly System testing framework runs several hundred integration tests of different granularity and purpose. The nightly releases are distributed and validated, and some are transformed into stable releases used for data processing worldwide. The first LHC long shutdown (2013-2015) activities will elicit increased load on the Nightly System as additional releases and builds are needed to exploit new programming techniques, languages, and profiling tools. This paper describes the plan of the ATLAS Nightly Build System Long Shutdown upgrade. It brings modern database and web technologies into the Nightly System, improves monitoring of nigh...

  8. Floating wind turbine system

    Science.gov (United States)

    Viterna, Larry A. (Inventor)

    2009-01-01

    A floating wind turbine system with a tower structure that includes at least one stability arm extending therefrom and that is anchored to the sea floor with a rotatable position retention device that facilitates deep water installations. Variable buoyancy for the wind turbine system is provided by buoyancy chambers that are integral to the tower itself as well as the stability arm. Pumps are included for adjusting the buoyancy as an aid in system transport, installation, repair and removal. The wind turbine rotor is located downwind of the tower structure to allow the wind turbine to follow the wind direction without an active yaw drive system. The support tower and stability arm structure is designed to balance tension in the tether with buoyancy, gravity and wind forces in such a way that the top of the support tower leans downwind, providing a large clearance between the support tower and the rotor blade tips. This large clearance facilitates the use of articulated rotor hubs to reduced damaging structural dynamic loads. Major components of the turbine can be assembled at the shore and transported to an offshore installation site.

  9. Keeping Residents in the Dark: Do Night-Float Rotations Provide a Valuable Educational Experience?

    Science.gov (United States)

    Landmann, Alessandra; Mahnken, Heidi; Antonoff, Mara B; White, SuAnn; Patel, Arpit; Scifres, Aaron M; Lees, Jason S

    2017-08-18

    To qualify and characterize resident overnight activity. A prospective 3-phase study was conducted of surgical residents with attention to activities performed on the overnight rotation: needs assessment, direct observation of activities, and feedback. This study was conducted at the University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma. This is both a tertiary referral center and the only American College of Surgeons (ACS) verified level 1 trauma center in the state. This study included current surgical residents within the residency program. During the study period, 270 pages were individually recorded, with 60% of these pages defined as time-sensitive activities. In addition, most of the pages involved pressing patient-care issues irrespective of postgraduate year level. Analyses revealed that residents spend most of their time performing educational activities (62%). On feedback, residents reported overall satisfaction with the learning opportunities during night-shift (6.4/7.0) and indicated their perceptions of an adequate balance of service and education on night float (6.6/7.0). This correlates with our annual rotation assessment where residents identify night-float as an overall positive experience which provides educational benefit. Work-hour restrictions induce residency programs to adapt to new training models. Our results report a breakdown of resident activities while on night-float and demonstrate that overnight shifts continue to provide important educational opportunities during training. Copyright © 2017 Association of Program Directors in Surgery. All rights reserved.

  10. Strategies for improving education on night-float rotations: a review.

    Science.gov (United States)

    Weltz, Adam S; Cimeno, Arielle; Kavic, Stephen M

    2015-01-01

    Night float rotations (NF) have been developed as a means of achieving duty hour compliance among residency programs. These were initially pioneered in the late 1980s as a response to fatigue among residents. The NF experience had its genesis in work hour reform and providing hospital service moreso than education. However, as NF has become ubiquitous, it is not clear that we have adequately revisited the educational component of this experience. We systematically reviewed the literature on educational aspects of a night float experience. PubMed searches were conducted for the terms "night float" and "night, curriculum, residency." This yielded 320 articles. Concerning educational aspects of the NF reduced the total to 134 articles. Editorials and those concerning procedural volumes or handoffs were also excluded. Most articles used surveys as methodology, so formal statistical analysis was not possible. In total, 42 independent articles were found that directly related to the educational value of NF rotations, spanning all of the medical disciplines. Each study was searched for interventions or strategies that may affect the educational value of the NF experience. These may be grouped broadly into 3 discrete categories: (1) attention to the sleep-wake cycle, (2) addition of personal to augment the experience and (3) incorporation of formal educational elements to night rotations. A summary of these strategies is presented in Table 3. NF is a practical solution to the challenge of work hour restrictions in residency, and is likely to persist in the future. Some educational issues arise due to the altered physiology of a reversed sleep-wake cycle, which may be best resolved through structural limitations of the night rotations. Other deficiencies are based on lack of interactions, for which there are strategies to improving the NF educational experience. Copyright © 2014 Association of Program Directors in Surgery. Published by Elsevier Inc. All rights reserved.

  11. Simplified Night Sky Display System

    Science.gov (United States)

    Castellano, Timothy P.

    2010-01-01

    A document describes a simple night sky display system that is portable, lightweight, and includes, at most, four components in its simplest configuration. The total volume of this system is no more than 10(sup 6) cm(sup 3) in a disassembled state, and weighs no more than 20 kilograms. The four basic components are a computer, a projector, a spherical light-reflecting first surface and mount, and a spherical second surface for display. The computer has temporary or permanent memory that contains at least one signal representing one or more images of a portion of the sky when viewed from an arbitrary position, and at a selected time. The first surface reflector is spherical and receives and reflects the image from the projector onto the second surface, which is shaped like a hemisphere. This system may be used to simulate selected portions of the night sky, preserving the appearance and kinesthetic sense of the celestial sphere surrounding the Earth or any other point in space. These points will then show motions of planets, stars, galaxies, nebulae, and comets that are visible from that position. The images may be motionless, or move with the passage of time. The array of images presented, and vantage points in space, are limited only by the computer software that is available, or can be developed. An optional approach is to have the screen (second surface) self-inflate by means of gas within the enclosed volume, and then self-regulate that gas in order to support itself without any other mechanical support.

  12. Evolution of the ATLAS Nightly Build System

    CERN Document Server

    Undrus, A

    2012-01-01

    The ATLAS Nightly Build System is a major component in the ATLAS collaborative software organization, validation, and code approval scheme. For over 10 years of development it has evolved into a factory for automatic release production and grid distribution. The 50 multi-platform branches of ATLAS releases provide vast opportunities for testing new packages, verification of patches to existing software, and migration to new platforms and compilers for ATLAS code that currently contains 2200 packages with 4 million C++ and 1.4 million python scripting lines written by about 1000 developers. Recent development was focused on the integration of ATLAS Nightly Builds and Installation systems. The nightly releases are distributed and validated and some are transformed into stable releases used for data processing worldwide. The ATLAS Nightly System is managed by the NICOS control tool on a computing farm with 50 powerful multiprocessor nodes. NICOS provides the fully automated framework for the release builds, test...

  13. Evolution of the ATLAS Nightly Build System

    CERN Document Server

    Undrus, A; The ATLAS collaboration

    2012-01-01

    For over 10 years of development the ATLAS Nightly Build System has evolved into a factory for automatic release production and grid distribution. The numerous branches of ATLAS releases provide vast opportunities for testing new packages, verification of patches to existing software, and migration to new platforms and compilers for ATLAS code that currently contains ~2200 packages with 4 million C++ and 1.4 million python scripting lines written by ~1000 developers. The nightly releases lead up to stable releases used for data processing and analysis worldwide. The ATLAS Nightly System is managed by the NICOS control tool on the ATLAS Build Farm. The ATN testing framework runs unit and integration tests for the nightly releases.

  14. Multiprocessing system for performing floating point arithmetic operations

    Energy Technology Data Exchange (ETDEWEB)

    Nguyenphu, M.; Thatcher, L.E.

    1990-10-02

    This patent describes a data processing system. It comprises: a fixed point arithmetic processor means for performing fixed point arithmetic operations and including control means for decoding a floating point arithmetic instruction specifying a floating point arithmetic operation, and an addressing means for computing addresses for floating point data for the floating point operation from a memory means. The memory means for storing data and including means for receiving the addresses from the fixed point arithmetic processor means and providing the floating point data to a floating point arithmetic processor means; and the floating point arithmetic processor means for performing floating point arithmetic operations and including control means for decoding the floating point instruction and performing the specified floating point arithmetic operation upon the floating point data from the memory means.

  15. Multi-channel automotive night vision system

    Science.gov (United States)

    Lu, Gang; Wang, Li-jun; Zhang, Yi

    2013-09-01

    A four-channel automotive night vision system is designed and developed .It is consist of the four active near-infrared cameras and an Mulit-channel image processing display unit,cameras were placed in the automobile front, left, right and rear of the system .The system uses near-infrared laser light source,the laser light beam is collimated, the light source contains a thermoelectric cooler (TEC),It can be synchronized with the camera focusing, also has an automatic light intensity adjustment, and thus can ensure the image quality. The principle of composition of the system is description in detail,on this basis, beam collimation,the LD driving and LD temperature control of near-infrared laser light source,four-channel image processing display are discussed.The system can be used in driver assistance, car BLIS, car parking assist system and car alarm system in day and night.

  16. Evolution of the ATLAS Nightly Build System

    Science.gov (United States)

    Undrus, A.

    2012-12-01

    The ATLAS Nightly Build System is a major component in the ATLAS collaborative software organization, validation, and code approval scheme. For over 10 years of development it has evolved into a factory for automatic release production and grid distribution. The 50 multi-platform branches of ATLAS releases provide vast opportunities for testing new packages, verification of patches to existing software, and migration to new platforms and compilers for ATLAS code that currently contains 2200 packages with 4 million C++ and 1.4 million python scripting lines written by about 1000 developers. Recent development was focused on the integration of ATLAS Nightly Build and Installation systems. The nightly releases are distributed and validated and some are transformed into stable releases used for data processing worldwide. The ATLAS Nightly System is managed by the NICOS control tool on a computing farm with 50 powerful multiprocessor nodes. NICOS provides the fully automated framework for the release builds, testing, and creation of distribution kits. The ATN testing framework of the Nightly System runs unit and integration tests in parallel suites, fully utilizing the resources of multi-core machines, and provides the first results even before compilations complete. The NICOS error detection system is based on several techniques and classifies the compilation and test errors according to their severity. It is periodically tuned to place greater emphasis on certain software defects by highlighting the problems on NICOS web pages and sending automatic e-mail notifications to responsible developers. These and other recent developments will be presented and future plans will be described.

  17. FLOATING DRUG DELIVERY SYSTEM - CHRONOTHERAPEUTIC APPROACH

    Directory of Open Access Journals (Sweden)

    Vishal Kalal

    2011-04-01

    Full Text Available The purpose of writing this review on the floating drug delivery systems (FDDS was to compile the recent literature with special focus on the principal mechanism of floatation to achieve gastric retention. FDDS is one of the approaches in chronotherapeutic drug delivery. In the past reviews of FDDS the physiological and formulation variables affecting gastric retention, approaches to design single-unit and multiple-unit floating systems, their classification and formulation aspects have been covered. This review summarizes the special focus on chronotherapeutics, diseases affected by biological rhythm, its importance, advantages, various approaches in Chronotherapeutic drug delivery and applications of FDDS. These systems are useful for several problems encountered during the development of a pharmaceutical dosage forms.

  18. Ships as future floating farm systems?

    Science.gov (United States)

    Moustafa, Khaled

    2016-09-29

    Environmental and agriculture challenges such as severe drought, desertification, sprawling cities and shrinking arable lands in large regions in the world compel us to think about alternative and sustainable farming systems. Ongoing projects to build floating cities in the sea suggest that building specific ships for farming purposes (as farming ships or farming boats) would also be attainable to introduce new farming surfaces and boost food production worldwide to cope with food insecurity issues.

  19. Turbomachinery systems for floating production applications

    Energy Technology Data Exchange (ETDEWEB)

    Windt, Jonathan P.; Kurz, Rainer [Solar Turbines Incorporated, San Diego, CA (United States)

    2008-07-01

    Since 1995 there has been a dramatic increase in oil and gas exploration and production using floating platforms in deeper waters located further offshore. This exploration started with tension leg platforms, progressed through SPARs and Semi-Submersibles, and later evolved into Floating Production Storage and Offloading (FPSO) vessels. Turbomachinery equipment installed on a floating platform or vessel will be expected to operate in the same manner as a land based machine, but in a variety of climate and environmental conditions that now includes motion. To operate successfully, specific design considerations for the turbo-machinery packages are required. It is critical to take into account the type of vessel, the expected list, trim and dynamic motion angles, the dynamic forces applied, the expected deck deflection as a result of those forces, understand the applicable class requirement, and where the equipment will be located on the vessel. This information is then translated into the design conditions to determine the type of mounting method to be used to attach the turbo-machinery package to the deck, the expected accelerations for structural analysis, and oil tank and system designs for fluid management. Furthermore, compressor designs need to allow utmost flexibility to adapt to changing operating conditions. (author)

  20. Rounding in redundant digit floating point system

    Science.gov (United States)

    Fahmy, Hossam A. H.; Flynn, Michael J.

    2003-12-01

    Redundant representations are used to increase the performance of arithmetic units. If redundancy is eliminated, the bits needed to represent a number may increase or decrease depending on the type of redundancy used. In such a redundant representation, finding the exact location and correct decision for rounding without eliminating the redundancy or loosing its performance gains is difficult. This paper discusses the different issues related to rounding in redundant systems. It also presents a solution that was used to maintain the gains of redundancy in a floating point unit while correctly implementing the IEEE rounding modes.

  1. Entropie analysis of floating car data systems

    Directory of Open Access Journals (Sweden)

    F. Gössel

    2004-01-01

    Full Text Available The knowledge of the actual traffic state is a basic prerequisite of modern traffic telematic systems. Floating Car Data (FCD systems are becoming more and more important for the provision of actual and reliable traffic data. In these systems the vehicle velocity is the original variable for the evaluation of the current traffic condition. As real FCDsystems are operating under conditions of limited transmission and processing capacity the analysis of the original variable vehicle speed is of special interest. Entropy considerations are especially useful for the deduction of fundamental restrictions and limitations. The paper analyses velocity-time profiles by means of information entropy. It emphasises in quantification of the information content of velocity-time profiles and the discussion of entropy dynamic in velocity-time profiles. Investigations are based on empirical data derived during field trials. The analysis of entropy dynamic is carried out in two different ways. On one hand velocity differences within a certain interval of time are used, on the other hand the transinformation between velocities in certain time distances was evaluated. One important result is an optimal sample-rate for the detection of velocity data in FCD-systems. The influence of spatial segmentation and of different states of traffic was discussed.

  2. Helicopter Night Vision System Simulation Evaluation

    Science.gov (United States)

    1981-12-01

    mision safety. The enroute evaluation indicates a con- sistent preference for the 4HMD-PMD configuration. The copilot felt that the virtual HUD...pilot but never allowed Cho copilot to slow in a hover. In edsencer the night cranpore mision appears wo be a two pilot task with a t consant verbal

  3. INVIS : Integrated night vision surveillance and observation system

    NARCIS (Netherlands)

    Toet, A.; Hogervorst, M.A.; Dijk, J.; Son, R. van

    2010-01-01

    We present the design and first field trial results of the all-day all-weather INVIS Integrated Night Vision surveillance and observation System. The INVIS augments a dynamic three-band false-color nightvision image with synthetic 3D imagery in a real-time display. The night vision sensor suite

  4. INVIS : Integrated night vision surveillance and observation system

    NARCIS (Netherlands)

    Toet, A.; Hogervorst, M.A.; Dijk, J.; Son, R. van

    2010-01-01

    We present the design and first field trial results of the all-day all-weather INVIS Integrated Night Vision surveillance and observation System. The INVIS augments a dynamic three-band false-color nightvision image with synthetic 3D imagery in a real-time display. The night vision sensor suite cons

  5. Dynamic Response Analysis of a Floating Mooring System

    Institute of Scientific and Technical Information of China (English)

    LE Conghuan; DING Hongyan; ZHANG Puyang

    2014-01-01

    An innovative floating mooring system with two or more independent floating mooring platforms in the middle and one rigid platform on each side is proposed for improving efficiency and safety in shallow water. For this new system, most of collision energy is absorbed through the displacement of floating platforms. In order to illustrate the validity of the system, a series of model tests were conducted at a scale of 1:40. The coupled motion characteristics of the floating mooring platforms were discussed under regular and irregular waves, and the influences of wave direction and other characteristics on dynamic response of the system were analyzed. The results show that the mooring system is safest at 0˚of wave incident angle, whereas the most dangerous mooring state occurs at 90˚ of wave incident angle. Motion responses increase with the increase of wave height, but are not linearly related to changes in wave height.

  6. LHCb: A New Nightly Build System for LHCb

    CERN Multimedia

    Clemencic, M

    2013-01-01

    The nightly build system used so far by LHCb has been implemented as an extension on the system developed by CERN PH/SFT group (as presented at CHEP2010). Although this version has been working for many years, it has several limitations in terms of extensibility, management and ease of use, so that it was decided to develop a new version based on a continuous integration system. In this paper we describe a new implementation of the LHCb Nightly Build System based on the open source continuous integration system Jenkins and report on the experience on the configuration of a complex build workflow in Jenkins.

  7. The impact of changing night vision goggle spectral response on night vision imaging system lighting compatibility

    Science.gov (United States)

    Task, Harry L.; Marasco, Peter L.

    2004-09-01

    The defining document outlining night-vision imaging system (NVIS) compatible lighting, MIL-L-85762A, was written in the mid 1980's, based on what was then the state of the art in night vision and image intensification. Since that time there have been changes in the photocathode sensitivity and the minus-blue coatings applied to the objective lenses. Specifically, many aviation night-vision goggles (NVGs) in the Air Force are equipped with so-called "leaky green" or Class C type objective lens coatings that provide a small amount of transmission around 545 nanometers so that the displays that use a P-43 phosphor can be seen through the NVGs. However, current NVIS compatibility requirements documents have not been updated to include these changes. Documents that followed and replaced MIL-L-85762A (ASC/ENFC-96-01 and MIL-STD-3009) addressed aspects of then current NVIS technology, but did little to change the actual content or NVIS radiance requirements set forth in the original MIL-L-85762A. This paper examines the impact of spectral response changes, introduced by changes in image tube parameters and objective lens minus-blue filters, on NVIS compatibility and NVIS radiance calculations. Possible impact on NVIS lighting requirements is also discussed. In addition, arguments are presented for revisiting NVIS radiometric unit conventions.

  8. Polyester mooring stiffness modeling for deepwater floating system

    Institute of Scientific and Technical Information of China (English)

    Chen Yongjun; Qu Yan; Zhang Tianyu

    2013-01-01

    Polyester mooring has become increasing popular to serve as permanent station-keeping system for deepwater floating system during recent years.Comparing to the traditional steel wire mooring,polyester mooring provides significant benefits in deepwater,such as reduced installed capital expenditure (CAPEX) and smaller vertical loads on host platform.Polyester rope is a visco-elastic material,and its stiffness is nonlinear and affected by mean load,load range,loading period and loading history.There is a perception that the polyester stiffness model has significant impact on the floating system' s performance.This paper presents a detailed description and comparison of two stiffness models and three analytic approaches,and provides a systematic study of the impact of polyester mooring stiffness modeling on the deepwater floating system performance.

  9. Wave attenuation charcteristics of tethered float system

    Digital Repository Service at National Institute of Oceanography (India)

    Vethamony, P.

    with increase 04 0.8 I 0.9 I.‘0 I!1 I 1.2 I 1.3 11.4 11.5 I!6 1.7 R(m)- Fig 7 (a). Variation of wave power and drag power with float size. t t 0 I I I I I I I I I 2 X-x /x-x-x--* Q) a- aD d x/x’ b 0- X’ (D y/ u) 6 t, 0 IQ_ d :- ? 0 9, 0...

  10. Low Cost Night Vision System for Intruder Detection

    Science.gov (United States)

    Ng, Liang S.; Yusoff, Wan Azhar Wan; R, Dhinesh; Sak, J. S.

    2016-02-01

    The growth in production of Android devices has resulted in greater functionalities as well as lower costs. This has made previously more expensive systems such as night vision affordable for more businesses and end users. We designed and implemented robust and low cost night vision systems based on red-green-blue (RGB) colour histogram for a static camera as well as a camera on an unmanned aerial vehicle (UAV), using OpenCV library on Intel compatible notebook computers, running Ubuntu Linux operating system, with less than 8GB of RAM. They were tested against human intruders under low light conditions (indoor, outdoor, night time) and were shown to have successfully detected the intruders.

  11. Research on Energy Conversion System of Floating Wave Energy Converter

    Institute of Scientific and Technical Information of China (English)

    张亚群; 盛松伟; 游亚戈; 吴必军; 刘洋

    2014-01-01

    A wave power device includes an energy harvesting system and a power take-off system. The power take-off system of a floating wave energy device is the key that converts wave energy into other forms. A set of hydraulic power take-off system, which suits for the floating wave energy devices, includes hydraulic system and power generation system. The hydraulic control system uses a special“self-hydraulic control system”to control hydraulic system to release or save energy under the maximum and the minimum pressures. The maximum pressure is enhanced to 23 MPa, the minimum to 9 MPa. Quite a few experiments show that the recent hydraulic system is evidently improved in efficiency and reliability than our previous one, that is expected to be great significant in the research and development of our prototype about wave energy conversion.

  12. FEA for designing of floating raft shock-resistant system

    Institute of Scientific and Technical Information of China (English)

    ZHAO Ying-long; HE Lin; HUANG Ying-yun; WANG Yu

    2003-01-01

    Choosing the equipment with good shock-resistant performance and taking shock protection measures while designing the onboard settings, the safety of onboard settings can be assured when warships, especially submarine subjected to non-contact underwater explosion, that is, these means can be used to limit the rattlespace (i.e., the maximum displacement of the equipment relative to the base) and the peak acceleration experienced by the equipment. Using shock-resistant equipments is one of shock protection means. The shock-resistant performance of the shock-resistant equipments should be verified in the design phase of the equipments. The FEA (finite element analysis) software, for example, MSC.NASTRAN(R), can be used to verify the shock-resistant performance. MSC.PATRAN(R) and MSC.NASTRAN are used for modeling and analyzing the floating raft vibration isolating equipment. The model of the floating raft and the floating raft vibration isolating system are theoretically analyzed and calculated, and the analysis results are in agreement with the test results. The transient response analysis of the system model follows the modal analysis of the floating raft vibration isolating system. And it is used to verify the shock-resistant performance. The analysis and calculation method used in this paper can be used to analyze the shock-resistant performance of onboard shock-resistant equipments.

  13. A REVIEW ON FLOATING TYPE GASTRORETENTIVE DRUG DELIVERY SYSTEM

    Directory of Open Access Journals (Sweden)

    Pallavi Pal

    2012-04-01

    Full Text Available Oral controlled release delivery systems are programmed to deliver the drug in predictable time frame that will increase the efficacy and minimize the adverse effects and increase the bioavailability of drugs. Oral route is considered mostnatural, uncomplicated, convenient and safe due to its ease of administration, patient acceptance, and cost-effective manufacturing process.Floating Drug delivery system are designed to prolong the gastric residence time after oral administration, at particular site and controlling the release of drug especially useful for achieving controlled plasma level a swell as improving bioavailability Several approaches are currently being used to prolong the GRT, including floating drug delivery systems (FDDS, also known as hydrodynamically balanced systems (HBS, swelling and expanding systems, high-density systems, and other delayed gastric emptying devices.

  14. Development Of An Aviator's Night Vision Imaging System (ANVIS)

    Science.gov (United States)

    Efkernan, Albert; Jenkins, Donald

    1981-04-01

    Historical background is presented of the U. S. Army's requirement for a high performance, lightweight, night vision goggle for use by helicopter pilots. System requirements are outlined and a current program for development of a third generation image intensification device is described. Primary emphasis is on the use of lightweight, precision molded, aspheric plastic optical elements and molded plastic mechanical components. System concept, design, and manufacturing considerations are presented.

  15. Night driving assistance system based on spatial perspective approach

    Science.gov (United States)

    Poh, Chung-Kiak; Poh, Chung-How

    2004-10-01

    In this paper we put forward and evaluate a near real-time night driving assistance system intended for use in land vehicles (cars in particular) to help with T-junctions crossing at night. The onboard system of the host vehicle computes the remaining distance between itself and the nearest approaching vehicle using spatial perspective method. The algorithm evaluates the interspacing of the incoming vehicle's headlights. This allows the distance-to-contact to be determined or estimated. This work emphasises techniques to obtain the required image quality for distance sensing. The image quality was achieved when work was focused primarily at the hardware levels. With polaroids in place, the acquired images show that the headlight signals are clearly distinguishable from other ambient lights. This significantly simplifies image processing. Road-testing shows rather promising results. The system can be generalised to intersection settings, prevent rear-front collisions and may be extended for daytime applications with the introduction of virtual references.

  16. Floating-point array processors evolve into tailorable systems

    Energy Technology Data Exchange (ETDEWEB)

    Kotelly, G.

    1983-05-12

    Recently introduced 32-bit floating point array processors (APs) combine configuration flexibility, integrated hardware/software system architecture and real-time computational power to meet a variety of application requirements. APS have now evolved into general-purpose boxes and PC boards which readily adapt to changing OEM needs. Contributing to this greater AP versatility are a variety of hardware and software features. These features are described and the range of available products is surveyed.

  17. Designs and applications for floating-hydro power systems in small streams

    Energy Technology Data Exchange (ETDEWEB)

    Rehder, J.B.

    1983-01-01

    The project focuses on an appropriate technology for small-scale hydro power: floating waterwheels and turbines. For background, relic and existing systems such as early floating mills, traditional Amish waterwheels, and micro-hydro systems are examined. In the design phase of the project, new designs for Floating Hydro Power Systems include: an analysis of floatation materials and systems; a floating undershot waterwheel design; a floating cylinder (fiberglass storage tank) design; a submerged tube design; and a design for a floating platform with submerged propellers. Finally, in the applications phase, stream flow data from East Tennessee streams are used in a discussion of the potential applications of floating hydro power systems in small streams.

  18. In vitro Evaluation of Acyclovir/Chitosan Floating Systems.

    Science.gov (United States)

    Ruiz-Caro, Roberto; Veiga, María D

    2010-12-06

    Chitosan (CS) floating lyophilized formulations (L) for gastric drug delivery of acyclovir (ACV) have been developed. The freeze-dried formulations were obtained from acidic aqueous suspensions prepared with different ACV/CS ratios. No changes in ACV crystallinity were observed during X-ray diffraction powder studies as a consequence of the manufacturing process. Considering that fed and fasted states modified the intragastric pH, swelling and in vitro dissolution studies were carried out in different acidic media (0.1 M HCl and progressive pH medium) in order to understand the influence of these physiological states on ACV/CS formulations. Swelling behavior of the floating lyophilized formulations was dependent on CS and ACV proportions within L and on medium nature due to pH dependent CS solubility. Furthermore, no interactions between ACV and CS were detected in solid state according to the X-ray studies. In vitro dissolution of ACV from L was influenced by the swelling behavior. However, it is feasible to optimize the ACV/CS ratios to achieve a desired formulation that releases the total quantity of ACV at a specific time. Moreover, floatability was assessed by buoyancy tests. The results demonstrated that the freeze-drying process achieved effective floating systems capable of remaining within the stomach while the total amount of ACV is released from L.

  19. Design and optimization of floating drug delivery system of acyclovir

    Directory of Open Access Journals (Sweden)

    Kharia A

    2010-01-01

    Full Text Available The purpose of the present work was to design and optimize floating drug delivery systems of acyclovir using psyllium husk and hydroxypropylmethylcellulose K4M as the polymers and sodium bicarbonate as a gas generating agent. The tablets were prepared by wet granulation method. A 32 full factorial design was used for optimization of drug release profile. The amount of psyllium husk (X1 and hydroxypropylmethylcellulose K4M (X2 were selected as independent variables. The times required for 50% (t 50% and 70% (t 70% drug dissolution were selected as dependent variables. All the designed nine batches of formulations were evaluated for hardness, friability, weight variation, drug content uniformity, swelling index, in vitro buoyancy, and in vitro drug release profile. All formulations had floating lag time below 3 min and constantly floated on dissolution medium for more than 24 h. Validity of the developed polynomial equation was verified by designing two check point formulations (C1 and C2. The closeness of predicted and observed values for t 50% and t 70% indicates validity of derived equations for the dependent variables. These studies indicated that the proper balance between psyllium husk and hydroxypropylmethylcellulose K4M can produce a drug dissolution profile similar to the predicted dissolution profile. The optimized formulations followed Higuchi′s kinetics while the drug release mechanism was found to be anomalous type, controlled by diffusion through the swollen matrix.

  20. Coupled Dynamic Modeling of Floating Wind Turbine Systems: Preprint

    Energy Technology Data Exchange (ETDEWEB)

    Wayman, E. N.; Sclavounos, P. D.; Butterfield, S.; Jonkman, J.; Musial, W.

    2006-03-01

    This article presents a collaborative research program that the Massachusetts Institute of Technology (MIT) and the National Renewable Energy Laboratory (NREL) have undertaken to develop innovative and cost-effective floating and mooring systems for offshore wind turbines in water depths of 10-200 m. Methods for the coupled structural, hydrodynamic, and aerodynamic analysis of floating wind turbine systems are presented in the frequency domain. This analysis was conducted by coupling the aerodynamics and structural dynamics code FAST [4] developed at NREL with the wave load and response simulation code WAMIT (Wave Analysis at MIT) [15] developed at MIT. Analysis tools were developed to consider coupled interactions between the wind turbine and the floating system. These include the gyroscopic loads of the wind turbine rotor on the tower and floater, the aerodynamic damping introduced by the wind turbine rotor, the hydrodynamic damping introduced by wave-body interactions, and the hydrodynamic forces caused by wave excitation. Analyses were conducted for two floater concepts coupled with the NREL 5-MW Offshore Baseline wind turbine in water depths of 10-200 m: the MIT/NREL Shallow Drafted Barge (SDB) and the MIT/NREL Tension Leg Platform (TLP). These concepts were chosen to represent two different methods of achieving stability to identify differences in performance and cost of the different stability methods. The static and dynamic analyses of these structures evaluate the systems' responses to wave excitation at a range of frequencies, the systems' natural frequencies, and the standard deviations of the systems' motions in each degree of freedom in various wind and wave environments. This article in various wind and wave environments. This article explores the effects of coupling the wind turbine with the floating platform, the effects of water depth, and the effects of wind speed on the systems' performance. An economic feasibility analysis of

  1. Own the night with flying colors: towards ergonomic full color multiband night vision systems

    NARCIS (Netherlands)

    Toet, A.; Hogervorst, M.A.

    2007-01-01

    Recently we introduced a method for applying natural daytime colors to multi-band night-time images. In this method statistical properties of a reference daytime color image are transferred to the multi-band image. Although the method yields nice results, its practical value is limited since it is c

  2. System for deflection measurements of floating dry docks

    Science.gov (United States)

    Gorbachev, Alexey A.; Pantyushin, Anton V.; Serikova, Mariya G.; Korotaev, Valery V.; Timofeev, Aleksandr N.

    2015-05-01

    In this paper we introduce a system for deflection measurement of floating dry docks. The system contains two measurement channels observing opposite directions of the dock. It also includes set of reference marks, an industrial computer and a display. Each channel contains CMOS camera with long focal-length lens. Reference marks are implemented as IR LED arrays with 940 nm working wavelength for better performance within bad weather conditions (e.g. fog, rain, high humidity etc.). In the paper we demonstrate results of an analysis of different optical schemes for coupling the oppositely directed channels of the measurement unit and show that the scheme with two image sensors with separated lenses is an optimal option, because it allows usage of nonequidistant location of reference marks and demonstrates the least value of parasitic shift caused by rotations of the measuring unit. The developed system was tested both on specially-designed setup and in real infrastructure of a floating dry dock. The conducted tests proved that a measuring error of the system is smaller than +/- 1.5 mm within the measurement range of +/- 150 mm when deflection of 100 m dock is measured. Obtained results showed that the system demonstrates an ability to work in a harsh environment including poor weather conditions.

  3. Bread board float zone experiment system for high purity silicon

    Science.gov (United States)

    Kern, E. L.; Gill, G. L., Jr.

    1982-01-01

    A breadboard float zone experimental system has been established at Westech Systems for use by NASA in the float zone experimental area. A used zoner of suitable size and flexibility was acquired and installed with the necessary utilities. Repairs, alignments and modifications were made to provide for dislocation free zoning of silicon. The zoner is capable of studying process parameters used in growing silicon in gravity and is flexible to allow trying of new features that will test concepts of zoning in microgravity. Characterizing the state of the art molten zones of a growing silicon crystal will establish the data base against which improvements of zoning in gravity or growing in microgravity can be compared. 25 mm diameter was chosen as the reference size, since growth in microgravity will be at that diameter or smaller for about the next 6 years. Dislocation free crystals were growtn in the 100 and 111 orientations, using a wide set of growth conditions. The zone shape at one set of conditions was measured, by simultaneously aluminum doping and freezing the zone, lengthwise slabbing and delineating by etching. The whole set of crystals, grown under various conditions, were slabbed, polished and striation etched, revealing the growth interface shape and the periodic and aperiodic natures of the striations.

  4. System and method for floating-substrate passive voltage contrast

    Science.gov (United States)

    Jenkins, Mark W.; Cole, Jr., Edward I.; Tangyunyong, Paiboon; Soden, Jerry M.; Walraven, Jeremy A.; Pimentel, Alejandro A.

    2009-04-28

    A passive voltage contrast (PVC) system and method are disclosed for analyzing ICs to locate defects and failure mechanisms. During analysis a device side of a semiconductor die containing the IC is maintained in an electrically-floating condition without any ground electrical connection while a charged particle beam is scanned over the device side. Secondary particle emission from the device side of the IC is detected to form an image of device features, including electrical vias connected to transistor gates or to other structures in the IC. A difference in image contrast allows the defects or failure mechanisms be pinpointed. Varying the scan rate can, in some instances, produce an image reversal to facilitate precisely locating the defects or failure mechanisms in the IC. The system and method are useful for failure analysis of ICs formed on substrates (e.g. bulk semiconductor substrates and SOI substrates) and other types of structures.

  5. Floating-point arithmetic unit for pro-log based control systems

    Energy Technology Data Exchange (ETDEWEB)

    Macmillan, D.C.

    1978-01-01

    A floating-point unit was designed for use with control systems based on Pro-Log four-bit or eight-bit microprocessors. The unit consists of a single board which can be pin-connected into existing control systems. It provides the capability for floating-point arithmetic computations, including operations with transcendental and exponential functions. 9 figures, 2 tables.

  6. Definition of the Semisubmersible Floating System for Phase II of OC4

    Energy Technology Data Exchange (ETDEWEB)

    Robertson, A.; Jonkman, J.; Masciola, M.; Song, H.; Goupee, A.; Coulling, A.; Luan, C.

    2014-09-01

    Phase II of the Offshore Code Comparison Collaboration Continuation (OC4) project involved modeling of a semisubmersible floating offshore wind system as shown below. This report documents the specifications of the floating system, which were needed by the OC4 participants for building aero-hydro-servo-elastic models.

  7. Night Vision Training Systems%夜视训练系统

    Institute of Scientific and Technical Information of China (English)

    马月欣; 王志翔

    2002-01-01

    @@ 美国环境构建公司(ETC)设计研发的夜视训练系统包括夜视训练系统(night vision training system,NVTS)、夜视镜训练系统(night vision goggle training system,NVGTS)和先进战术夜视训练系统(advanced tactical night vision training system,ATNVTS),如封3图示.

  8. Floating-point processor for INTEL 8080A microprocessor systems

    Energy Technology Data Exchange (ETDEWEB)

    Bairstow, R.; Barlow, J.; Jires, M.; Waters, M.

    1982-03-01

    An A.M.D. 9511 Floating Point Processor has been interfaced to the Rutherford Laboratory Bubble Chamber Group's microcomputers. These computers are based on the INTEL 8080A microprocessor. The interface uses a memory mapped I/O technique to ensure rapid transfer of arguments between processors. The A.M.D. 9511 acts as a slave processor to the INTEL 8080A system. The 8080 processor is held in WAIT status until completion of the A.M.D. operation. A software Macro Processor has been written to effectively extend the basic INTEL 8080A instruction set to include the full range of A.M.D. 9511 instructions.

  9. Color night vision system for ground vehicle navigation

    Science.gov (United States)

    Ali, E. A.; Qadir, H.; Kozaitis, S. P.

    2014-06-01

    Operating in a degraded visual environment due to darkness can pose a threat to navigation safety. Systems have been developed to navigate in darkness that depend upon differences between objects such as temperature or reflectivity at various wavelengths. However, adding sensors for these systems increases the complexity by adding multiple components that may create problems with alignment and calibration. An approach is needed that is passive and simple for widespread acceptance. Our approach uses a type of augmented display to show fused images from visible and thermal sensors that are continuously updated. Because the raw fused image gave an unnatural color appearance, we used a color transfer process based on a look-up table to replace the false colors with a colormap derived from a daytime reference image obtained from a public database using the GPS coordinates of the vehicle. Although the database image was not perfectly registered, we were able to produce imagery acquired at night that appeared with daylight colors. Such an approach could improve the safety of nighttime navigation.

  10. Novel Strategy to Fabricate Floating Drug Delivery System Based on Sublimation Technique.

    Science.gov (United States)

    Huanbutta, Kampanart; Limmatvapirat, Sontaya; Sungthongjeen, Srisagul; Sriamornsak, Pornsak

    2016-06-01

    The present study aims to develop floating drug delivery system by sublimation of ammonium carbonate (AMC). The core tablets contain a model drug, hydrochlorothiazide, and various levels (i.e., 0-50% w/w) of AMC. The tablets were then coated with different amounts of the polyacrylate polymers (i.e., Eudragit® RL100, Eudragit® RS100, and the mixture of Eudragit® RL100 and Eudragit® RS100 at 1:1 ratio). The coated tablets were kept at ambient temperature (25°C) or cured at 70°C for 12 h before further investigation. The floating and drug release behaviors of the tablets were performed in simulated gastric fluid USP without pepsin at 37°C. The results showed that high amount of AMC induced the floating of the tablets. The coated tablets containing 40 and 50% AMC floated longer than 8 h with a time-to-float of about 3 min. The sublimation of AMC from the core tablets decreased the density of system, causing floating of the tablets. The tablets coated with Eudragit® RL100 floated at a faster rate than those of Eudragit® RS100. Even the coating level of polymer did not influence the time-to-float and floating time of coated tablets containing the same amount of AMC, the drug release from the tablets coated with higher coating level of polymer showed slower drug release. The results suggested that the sublimation technique using AMC is promising for the development of floating drug delivery system.

  11. The Application Modular Floating Pontoon to Support Floods Disaster Evacuation System in Heavy Populated Residential Area

    Directory of Open Access Journals (Sweden)

    Ahmad Fauzan Zakki

    2014-10-01

    Full Text Available During floods disaster in the heavy populated residential area, the lack of existing life saving appliances system such as rubber boat and wooden boat were not able to evacuate the disaster victims spontaneously in mass. The condition might be explained since the rubber boat and wooden boat have limited occupant capacity. Based on the conditions, the main objectives of the research are focused on the evaluation of the application of modular floating pontoon as multipurpose floating equipment to support floods disaster evacuation process. The investigation of the modular floating pontoon performance such as hydrostatics characteristics, the equilibrium condition and the intact stability was studied using strip theory and Krylov’s method. Furthermore, the strength analysis of the modular floating pontoon structure was calculated using finite element method. The results show that the modular floating pontoon is reliable to support the evacuation process.

  12. FLOATING QUANTIZATION EFFECTS ON MULTIRATE SAMPLED-DATA NONLINEAR CONTROL SYSTEMS

    Institute of Scientific and Technical Information of China (English)

    Yu Hongwang; Wang Zhiming

    2007-01-01

    In this article, floating quantization effects on multirate sampled-data control systems are studied. It shows that the solutions of multirate digital feedback control systems with nonlinear plant and with floating quantization in the controller are uniformly ultimately bounded if the associated linear systems consisting of linearization of the plant and controller with no quantization are Schur stable. Moreover, it also shows that the difference between the response of multirate digital controllers without quantizers and the same plant with floating quantization in the controllers can be made as small as desired by selecting proper quantization level.

  13. Hydrodynamic coefficients of a simplified floating system of gravity cage in waves

    Institute of Scientific and Technical Information of China (English)

    Chang-wen WU; Fu-kun GUI; Yu-cheng LI; Wei-huan FANG

    2008-01-01

    Numerical simulation and experimental tests were carried out to examine the hydrodynamic behaviors of a double-column floating system of gravity cage under wave conditions. A floating system of gravity cage can be treated as a small-sized floating structure when compared with the wavelengths. The main problem in calculating the wave loads on the small-sized floating structure is to obtain the reasonable force coefficients, which may differ from a submerged structure. In this paper, the floating system of gravity cage is simplified to a 2D problem, where the floating system is set symmetrically under wave conditions. The motion equations were deduced under wave conditions and a specific method was proposed to resolve the problem of wave forces acting on a small-sized floating system of gravity cage at water surface. Results of the numerical method were compared with those from model tests and the hydrodynamic coefficients Cn and C?were studied. It is found that Cn ranges from 0.6 to 1.0 while C?is between 0.4 and 0.6 in this study. The results are useful for research on the hydrodynamic behavior of the deep-water gravity sea cages.

  14. Passive ventilation systems with heat recovery and night cooling

    DEFF Research Database (Denmark)

    Hviid, Christian Anker; Svendsen, Svend

    2008-01-01

    with little energy consumption and with satisfying indoor climate. The concept is based on using passive measures like stack and wind driven ventilation, effective night cooling and low pressure loss heat recovery using two fluid coupled water-to-air heat exchangers developed at the Technical University...

  15. An analysis of the instantaneous floating point amplifier in DFS-V seismic recording system

    Energy Technology Data Exchange (ETDEWEB)

    Benji, W.

    1987-04-01

    Instantaneous floating point amplifier is a key unit in digital seismic system. The detailed description is given of circuits, functions and mechanisms of major constituents of the instantaneous floating point amplifier in DFS-V seismic system; and the process of gain adjustment of signal sample is analysed in the paper. A comment on its distinctive zero drift correction method is made. The concrete measure is put forward to cope with the problem in digital offset filtering taken in DFS-V system.

  16. Repair, Evaluation, Maintenance, and Rehabilitation Research Program: Elements of Floating-Debris Control Systems

    Science.gov (United States)

    1988-09-01

    a variety of materials from plastic bottles to sage brush, but it is t’quialy wood in soiw shape or form--from whole trees to lawn furniture. The...REPAIR, EVALUATION, MAINTENANCE, AND REHABILITATION’RESEARCH PROGRAM TECHNICAL REPORT REMVR-HY-3 ELEMENTS O F FLOATING- DEBRIS CONTROL SYSTEMS’ by...TITLE (Include Security Classification) Elements of Floating- Debris Control Systems 12. PERSONAL AUTHOR(S) Perham, Roscoe E. 13a. TYPE OF REPORT 13b TIME

  17. Controlled release calcium silicate based floating granular delivery system of ranitidine hydrochloride.

    Science.gov (United States)

    Jain, Ashish K; Jain, Sunil K; Yadav, Awesh; Agrawal, Govind P

    2006-10-01

    The objective of the present investigation was to prepare and evaluate floating granular delivery system consisting of (i) calcium silicate (CS) as porous carrier; (ii) ranitidine hydrochloride (RH), an anti-ulcer agent; and (iii) hydroxypropyl methylcellulose K4M (HPMC) and ethylcellulose (EC) as matrix forming polymers. The effect of various formulation and process variables on the particle morphology, particle size, micromeritic properties, percent drug content, in vitro floating behavior, and in vitro drug release from the floating granules was studied. The scanning electron microscopy (SEM) of granules revealed that that more pores of CS in secondary coated granules (SCG) were covered by the polymer film than those in primary coated granules (PCG). The formulation demonstrated favorable in vitro floating and drug release characteristics. The in vivo evaluation for the determination of pharmacokinetic parameters was performed in albino rats. Higher plasma concentration was maintained throughout the study period from the floating granules of RH. The enhanced bioavailability and elimination half-life observed in the present study may be due to the floating nature of the dosage form. The results suggested that CS is a useful carrier for the development of floating and sustained release preparations.

  18. A horizontal parallax table-top floating image system with freeform optical film structure

    Science.gov (United States)

    Chou, Ping-Yen; Huang, Yi-Pai; Liao, Chien-Chung; Chang, Chuan-Chung; Chuang, Fu-Ming Fleming; Tsai, Chao-Hsu

    2016-06-01

    In this paper, a new structure of horizontal parallax light field 3D floating image display system was proposed. The structure consists of pico-projectors, Fresnel lens, micro-lens array and sub-lens array with freeform shape. By the functions of optical components, each light field of projectors could be controlled as a fan ray, which has high directivity in horizontal and wide scattered angle in vertical. Furthermore, according to the reverse light tracing and integral image display technique, horizontal parallax floating 3D could be demonstrated in the system. Simulated results show that the proposed 3D display structure has a good image quality and the crosstalk is also limited below 22.9%. Compared with other 3D technologies, this structure could have more benefits, including displaying real high resolution floating image, unnecessary of physical hardware on the image plane, scalability of large size system, without the noise from spinning component, and so on.

  19. Effects of a night-team system on resident sleep and work hours.

    Science.gov (United States)

    Chua, Kao-Ping; Gordon, Mary Beth; Sectish, Theodore; Landrigan, Christopher P

    2011-12-01

    In 2009, Children's Hospital Boston implemented a night-team system on general pediatric wards to reduce extended work shifts. Residents worked 5 consecutive nights for 1 week and worked day shifts for the remainder of the rotation. Of note, resident staffing at night decreased under this system. The objective of this study was to assess the effects of this system on resident sleep and work hours. We conducted a prospective cohort study in which residents on the night-team system logged their sleep and work hours on work days. These data were compared with similar data collected in 2004, when there was a traditional call system. In 2004 and 2009, mean shift length was 15.22 ± 6.86 and 12.92 ± 5.70 hours, respectively (P = .161). Daily work hours were 10.49 ± 6.85 and 8.79 ± 6.42 hours, respectively (P = .08). Nightly sleep time decreased from 6.72 ± 2.60 to 4.77 ± 2.46 hours (P team system was unexpectedly associated with decreased sleep hours. As residency programs create work schedules that are compliant with the 2011 Accreditation Council for Graduate Medical Education duty-hour standards, resident sleep should be monitored carefully.

  20. DEVELOPMENT OF FAMOTIDINE FLOATING DRUG DELIVERY SYSTEM USING NATURAL POLYMERS

    Directory of Open Access Journals (Sweden)

    Mohammed Muqtader et al.

    2012-03-01

    Full Text Available In the present study,FDDS of Famotidine, a copmpetative inhibitor of histamine H2 receptors were prepared by using natural gums viz. xanthan gum and guar gum at different drug to gum ratio using sodium bicarbonate and citric acid as gas generating agents and lactose as diluent.FDDS tablets were prepared by wet granulation technique using PVP K30 as granulating agent. The prepared FDDS tablets were evaluated for its pre compression characteristics like bulk density, angle of repose, true density and compresibility index and post compression parameters such as hardness, friability, uniformity of drug content, in vitro floating studies, in vitro dissolution studies. The physical evaluation of all the formulations showed values within the prescribed limits for tests like hardness, friability and weight variation which indicate that the prepared tablets are of standard quality. The floating lag time of all the formulations was less than 10 minutes,All the formulations showed good matrix integrity and retarded the release of drug for 10 hours. Formulation X3 containg drug: xantahne gum ratio of 1:3 showed zero order kinetics, the IR spectroscopic studies indicated that the drug was compatible with the polymer and co-excipients and therefore can be a promising alternative to the existing dosage form.

  1. Conceptual Design of a Floating Support Structure and Mooring System for a Vertical Axis Wind Turbine

    DEFF Research Database (Denmark)

    Berthelsen, Petter Andreas; Fylling, Ivar; Vita, Luca;

    2012-01-01

    This paper deals with the conceptual design of a floating support structure and mooring system for a 5MW vertical axis offshore wind turbine. The work is carried out as part of the DeepWind project, where the main objective is to investigate the feasibility of a floating vertical axis offshore wind...... turbine. The DeepWind concept consists of a Darrieus rotor mounted on a spar buoy support structure. The conceptual design is carried out in an iterative process, involving the different subcomponents. The present work is part of the first design iteration and the objective is to find a feasible floating...... support structure and mooring system for the DeepWind concept. The conceptual design is formulated as an optimization problem: Starting with an initial configuration, the optimization procedure tries to find a cheaper solution while satisfying a set of design requirements. This approach utilizes available...

  2. Three-dimensional electro-floating display system using an integral imaging method.

    Science.gov (United States)

    Min, Sung-Wook; Hahn, Minsoo; Kim, Joohwan; Lee, Byoungho

    2005-06-13

    A new-type of three-dimensional (3D) display system based on two different techniques, image floating and integral imaging, is proposed. The image floating is an antiquated 3D display technique, in which a large convex lens or a concave mirror is used to display the image of a real object to observer. The electro-floating system, which does not use a real object, requires a volumetric display part in order to present 3D moving pictures. Integral imaging is an autostereoscopic technique consisting of a lens array and a two-dimensional display device. The integral imaging method can be adapted for use in an electro-floating display system because the integrated image has volumetric characteristics within the viewing angle. The proposed system combines the merits of the two techniques such as an impressive feel of depth and the facility to assemble. In this paper, the viewing characteristics of the two techniques are defined and analyzed for the optimal design of the proposed system. The basic experiments for assembling the proposed system were performed and the results are presented. The proposed system can be successfully applied to many 3D applications such as 3D television.

  3. Design of the IBM RISC System/6000 floating-point execution unit

    Energy Technology Data Exchange (ETDEWEB)

    Montoye, R.K.; Hokenek, E. (International Business Machines Corp., Yorktown Heights, NY (USA). Thomas J. Watson Research Center); Runyon, S.L. (IBM Advanced Workstations Div., Austin, TX (US))

    1990-01-01

    The IBM RISC System/6000 (RS/6000) floating-point unit (FPU) exemplifies a second-generation RISC CPU architecture and an implementation which greatly increases floating-point performance and accuracy. The key feature of the FPU is a unified floating-point multiply-add-fused unit (MAF) which performs the accumulate operation ({ital A} {times} {ital B}) + {ital C} as an indivisible operation. This single functional unit reduces the latency for chained floating-point operations, as well as rounding errors and chip busing. It also reduces the number of adders/normalizers by combining the addition required for fast multiplication with accumulation. The MAF unit is made practical by a unique fast-shifter, which eases the overlap of multiplication and addition, and a leading-zero/one anticipator, which eases overlap of normalization and addition. The accumulate instruction required by this architecture reduces the instruction path length by combining two instructions into one. Additionally, the RS/6000 FPU is tightly coupled to the rest of the CPU, unlike typical floating-point coprocessor chips.

  4. Leading-zero anticipator (LZA) in the IBM RISC System/6000 floating-point execution unit

    Energy Technology Data Exchange (ETDEWEB)

    Hokenek, E.; Montoye, R.K. (International Business Machines Corp., Yorktown Heights, NY (USA). Thomas J. Watson Research Center)

    1990-01-01

    This paper presents a technique used in the multiply-add-fused (MAF) unit of the IBM RISC System/6000 (RS/6000) processor for normalizing the floating-point results. Unlike the conventional procedures applied thus far, the so-called leading-zero anticipator (LZA) of the RS/6000 carries out processing of the leading zeros and ones in parallel with floating-point addition. Therefore, the new circuitry reduces the total latency of the MAF unit by enabling the normalization and addition to take place in a single cycle.

  5. Fate of methane in aquatic systems dominated by free-floating plants

    NARCIS (Netherlands)

    Kosten, Sarian; Piñeiro, Marcia; Goede, de Eefje; Klein, de Jeroen; Lamers, Leon P.M.; Ettwig, Katharina

    2016-01-01

    Worldwide the area of free-floating plants is increasing, which can be expected to alter methane (CH4) emissions from aquatic systems in several ways. A large proportion of the CH4 produced may become oxidized below the plants due to the accumulation of CH4 as a r

  6. Motion Performance and Mooring System of a Floating Offshore Wind Turbine

    Institute of Scientific and Technical Information of China (English)

    Jing Zhao; Liang Zhang; Haitao Wu

    2012-01-01

    The development of offshore wind farms was originally carried out in shallow water areas with fixed (seabed mounted) structures.However,countries with limited shallow water areas require innovative floating platforms to deploy wind turbines offshore in order to harness wind energy to generate electricity in deep seas.The performances of motion and mooring system dynamics are vital to designing a cost effective and durable floating platform.This paper describes a numerical model to simulate dynamic behavior of a new semi-submersible type floating offshore wind turbine (FOWT) system.The wind turbine was modeled as a wind block with a certain thrust coefficient,and the hydrodynamics and mooring system dynamics of the platform were calculated by SESAM software.The effect of change in environmental conditions on the dynamic response of the system under wave and wind loading was examined.The results indicate that the semi-submersible concept has excellent performance and SESAM could be an effective tool for floating wind turbine design and analysis.

  7. Comparison of simulations and offshore measurement data of a prototype of a floating combined wind and wave energy conversion system

    DEFF Research Database (Denmark)

    Yde, Anders; Larsen, Torben J.; Hansen, Anders Melchior

    2015-01-01

    In this paper, results from comparisons of simulations and measured offshore data from a floating combined wind and wave energy conversion system are presented. The device is a downscaled prototype that consists of a floating platform equipped with ten wave energy absorbers and three wind turbines...

  8. G-MAP: a novel night vision system for satellites

    Science.gov (United States)

    Miletti, Thomas; Maresi, Luca; Zuccaro Marchi, Alessandro; Pontetti, Giorgia

    2015-10-01

    The recent developments of single-photon counting array detectors opens the door to a novel type of systems that could be used on satellites in low Earth orbit. One possible application is the detection of non-cooperative vessels or illegal fishing activities. Currently only surveillance operations conducted by Navy or coast guard address this topic, operations by nature costly and with limited coverage. This paper aims to describe the architectural design of a system based on a novel single-photon counting detector, which works mainly in the visible and features fast readout, low noise and a 256x256 matrix of 64 μm-pixels. This detector is positioned in the focal plane of a fully aspheric reflective f/6 telescope, to guarantee state of the art performance. The combination of the two grants optimal ground sampling distance, compatible with the average dimension of a vessel, and overall performance. A radiative analysis of the light transmitted from emission to detection is presented, starting from models of lamps used for attracting fishes and illuminating the deck of the boats. A radiative transfer model is used to estimate the amount of photons emitted by such vessels reaching the detector. Since the novel detector features high framerate and low noise, the system as it is envisaged is able to properly serve the proposed goal. The paper shows the results of a trade-off between instrument parameters and spacecraft operations to maximize the detection probability and the covered sea surface. The status of development of both detector and telescope are also described.

  9. Extrapolation of extreme response for different mooring line systems of floating wave energy converters

    DEFF Research Database (Denmark)

    Ambühl, Simon; Sterndorff, Martin; Sørensen, John Dalsgaard

    2014-01-01

    Mooring systems for floating wave energy converters (WECs) are a major cost driver. Failure of mooring systems often occurs due to extreme loads. This paper introduces an extrapolation method for extreme response which accounts for the control system of a WEC that controls the loads onto the stru......Mooring systems for floating wave energy converters (WECs) are a major cost driver. Failure of mooring systems often occurs due to extreme loads. This paper introduces an extrapolation method for extreme response which accounts for the control system of a WEC that controls the loads onto...... the structure and the harvested power of the device as well as the fact that extreme loads may occur during operation and not at extreme wave states when the device is in storm protection mode. The extrapolation method is based on shortterm load time series and applied to a case study where up-scaled surge load...

  10. Image enhancement on the INVIS integrated night vision surveillance and observation system

    NARCIS (Netherlands)

    Dijk, J.; Schutte, K.; Toet, A.; Hogervorst, M.A.

    2010-01-01

    We present the design and first field trial results of the INVIS integrated night vision surveillance and observation system, in particular for the image enhancement techniques implemented. The INVIS is an all-day-andnight all-weather navigation and surveillance tool, combining three-band cameras. W

  11. Image enhancement on the INVIS integrated night vision surveillance and observation system

    NARCIS (Netherlands)

    Dijk, J.; Schutte, K.; Toet, A.; Hogervorst, M.A.

    2010-01-01

    We present the design and first field trial results of the INVIS integrated night vision surveillance and observation system, in particular for the image enhancement techniques implemented. The INVIS is an all-day-andnight all-weather navigation and surveillance tool, combining three-band cameras.

  12. LWIR passive perception system for stealthy unmanned ground vehicle night operations

    Science.gov (United States)

    Lee, Daren; Rankin, Arturo; Huertas, Andres; Nash, Jeremy; Ahuja, Gaurav; Matthies, Larry

    2016-05-01

    Resupplying forward-deployed units in rugged terrain in the presence of hostile forces creates a high threat to manned air and ground vehicles. An autonomous unmanned ground vehicle (UGV) capable of navigating stealthily at night in off-road and on-road terrain could significantly increase the safety and success rate of such resupply missions for warfighters. Passive night-time perception of terrain and obstacle features is a vital requirement for such missions. As part of the ONR 30 Autonomy Team, the Jet Propulsion Laboratory developed a passive, low-cost night-time perception system under the ONR Expeditionary Maneuver Warfare and Combating Terrorism Applied Research program. Using a stereo pair of forward looking LWIR uncooled microbolometer cameras, the perception system generates disparity maps using a local window-based stereo correlator to achieve real-time performance while maintaining low power consumption. To overcome the lower signal-to-noise ratio and spatial resolution of LWIR thermal imaging technologies, a series of pre-filters were applied to the input images to increase the image contrast and stereo correlator enhancements were applied to increase the disparity density. To overcome false positives generated by mixed pixels, noisy disparities from repeated textures, and uncertainty in far range measurements, a series of consistency, multi-resolution, and temporal based post-filters were employed to improve the fidelity of the output range measurements. The stereo processing leverages multi-core processors and runs under the Robot Operating System (ROS). The night-time passive perception system was tested and evaluated on fully autonomous testbed ground vehicles at SPAWAR Systems Center Pacific (SSC Pacific) and Marine Corps Base Camp Pendleton, California. This paper describes the challenges, techniques, and experimental results of developing a passive, low-cost perception system for night-time autonomous navigation.

  13. Investigation of power flow in a continuous floating raft isolation system

    Institute of Scientific and Technical Information of China (English)

    SONG Kongjie; MAO Yinghong; LIN Li

    2001-01-01

    A general dynamic model of a floating raft isolation system with multiple machines and supports is established. Considering the coupling of the foundation in high frequency and basing on the mobility analysis of substructures, the expression of the power flow transmission spectrum of the finite continuous isolation system of asymmetry is derived. At the same time the mathematical calculation and analysis by figure are made to find the rules related to the isolation effect in the case of different parameters of the system.

  14. Nitrate removal from polluted water by using a vegetated floating system.

    Science.gov (United States)

    Bartucca, Maria Luce; Mimmo, Tanja; Cesco, Stefano; Del Buono, Daniele

    2016-01-15

    Nitrate (NO3(-)) water pollution is one of the most prevailing and relevant ecological issues. For instance, the wide presence of this pollutant in the environment is dramatically altering the quality of superficial and underground waters. Therefore, we set up a floating bed vegetated with a terrestrial herbaceous species (Italian ryegrass) with the aim to remediate hydroponic solutions polluted with NO3(-). The floating bed allowed the plants to grow and achieve an adequate development. Ryegrass was not affected by the treatments. On the contrary, plant biomass production and total nitrogen content (N-K) increased proportionally to the amount of NO3(-) applied. Regarding to the water cleaning experiments, the vegetated floating beds permitted to remove almost completely all the NO3(-) added from the hydroponic solutions with an initial concentration of 50, 100 and 150 mg L(-1). Furthermore, the calculation of the bioconcentration factor (BCF) indicated this species as successfully applicable for the remediation of solutions polluted by NO3(-). In conclusion, the results highlight that the combination of ryegrass and the floating bed system resulted to be effective in the remediation of aqueous solutions polluted by NO3(-).

  15. Fate of methane in aquatic systems dominated by free-floating plants.

    Science.gov (United States)

    Kosten, Sarian; Piñeiro, Marcia; de Goede, Eefje; de Klein, Jeroen; Lamers, Leon P M; Ettwig, Katharina

    2016-11-01

    Worldwide the area of free-floating plants is increasing, which can be expected to alter methane (CH4) emissions from aquatic systems in several ways. A large proportion of the CH4 produced may become oxidized below the plants due to the accumulation of CH4 as a result of a decrease in the diffusive water-atmosphere flux and the entrapment of part of the ebullitive CH4, in combination with suitable conditions for methane oxidizing (MOX) bacteria in the aerobic rhizosphere. We used a set of essays to test this hypothesis and to explore the effect of different densities for three widespread free-floating species: Azolla filiculoides, Salvinia natans, and Eichhornia crassipes. The gas exchange velocity, proportion of CH4 bubbles trapped by the plants, occurrence of radial oxygen loss from roots, and MOX rates on the roots were assessed. We subsequently used the outcome of these experiments to parameterize a simple model. With this model we estimated the proportion of the produced CH4 that is oxidized, for different plant species and different densities. We found that in a shallow (1 m) system up to 70% of the CH4 produced may become oxidized as a result of a strong decrease in gas exchange combined with high MOX activity of the rhizosphere microbiome. As floating plants also are likely to increase CH4 production by organic matter production, especially when their presence induces anaerobic conditions, the overall effect on CH4 emission will strongly depend on local conditions. This explains the contrasting effects of floating plants on CH4 emissions in literature as reviewed here. As the effect of floating plants on CH4 emissions, including the high MOX rates we show here, can be substantial, there is an urgent need to consider this impact when assessing greenhouse gas budgets. Copyright © 2016 Elsevier Ltd. All rights reserved.

  16. Numerical analysis of added mass and damping of floating production,storage and offloading system

    Institute of Scientific and Technical Information of China (English)

    Ke Wang; Xi Zhang; Zhi-Qiang Zhang; Wang Xu

    2012-01-01

    An integral equation approach is utilized to investigate the added mass and damping of floating production,storage and offloading system (FPSO system).Finite water depth Green function and higher-order boundary element method are used to solve integral equation.Numerical results about added mass and damping are presented for odd and even mode motions of FPSO.The results show robust convergence in high frequency range and can be used in wave load analysis for FPSO designing and operation.

  17. Evaluation of Heavy Metal Toxicity on Radish: Comparison between Soil and Floating Hydroponics Systems

    OpenAIRE

    Salvatore, M. Di; Carafa, A. M.; Mingo, A.; Carratù, G.

    2012-01-01

    Two plant growing methods, namely use of soil and a floating hydroponic system, were compared in order to determine whether the response of radish to Cd, Cu, Ni and Zn was affected by the cultural system. Seed germination, plant biomass (root, shoot, hypocotyl), and heavy metal accumulation in different parts of the radish plants were monitored. The presence of heavy metals in the germination medium had no effect on seed germination, while the biomass of plants grown in hydroponics was negati...

  18. Composite Sliding Mode Control for a Free-Floating Space Rigid-Flexible Coupling Manipulator System

    OpenAIRE

    Wang Congqing; Wu Pengfei; Zhou Xin; Pei Xiwu

    2013-01-01

    The flexible space manipulator is a highly nonlinear and coupled dynamic system. This paper proposes a novel composite sliding mode control to deal with the vibration suppression and trajectory tracking of a free‐floating space rigid‐flexible coupling manipulator with a rigid payload. First, the dynamic equations of this system are established by using Lagrange and assumed mode methods and in the meantime this dynamic modelling allows consideration of the modelling errors, the external distur...

  19. Experimental Investigation of the Power Generation Performance of Floating-Point Absorber Wave Energy Systems: Preprint

    Energy Technology Data Exchange (ETDEWEB)

    Li, Y.; Yu, Y.; Epler, J.; Previsic, M.

    2012-04-01

    The extraction of energy from ocean waves has gained interest in recent years. The floating-point absorber (FPA) is one of the most promising devices among a wide variety of wave energy conversion technologies. Early theoretical studies mainly focused on understanding the hydrodynamics of the system and on predicting the maximum power that could be extracted by a heaving body. These studies evolve from the investigation of floating-body interactions in offshore engineering and naval architecture disciplines. To our best knowledge, no systematic study has been reported about the investigation of the power generation performance of an FPA with a close-to-commercial design. A series of experimental tests was conducted to investigate the power extraction performance of an FPA system.

  20. Removal of nutrients and veterinary antibiotics from swine wastewater by a constructed macrophyte floating bed system.

    Science.gov (United States)

    Xian, Qiming; Hu, Lixia; Chen, Hancheng; Chang, Zhizhou; Zou, Huixian

    2010-12-01

    The potential of three varieties of Italian ryegrass (Lolium multiflorum Lam.), Dryan, Tachimasari and Waseyutaka, to improve the water quality of swine wastewater was evaluated using a constructed macrophyte floating bed system. With respect to reductions in levels of nutrients, chemical oxygen demand (COD), and sulfonamide antimicrobials (SAs, including sulfadiazine, sulfamethazine, and sulfamethoxazole), Dryan performed better than Tachimasari and Waseyutaka. For Dryan, total N was reduced by 84.0%, total P by 90.4%, COD by 83.4% and sulfonamide antimicrobials by 91.8-99.5%. Similar results were observed for Tachimasari and Waseyutaka. The results indicated that the treatment of swine wastewater using the constructed macrophyte floating bed system was effective in the removal of nutrients and veterinary antibiotics.

  1. Numerical Simulation of the Spreading Dynamic Responses of the Multibody System with a Floating Base

    Institute of Scientific and Technical Information of China (English)

    Zhaobing Jiang; Luzhong Shao; Fei Shao

    2015-01-01

    To simulate the dynamic responses of the multibody system with a floating base when the upper parts spread with a certain sequence and relative speed, the homogeneous matrix method is employed to model and simulate a four-body system with a floating base and the motions are analyzed when the upper parts are spread sequentially or synchronously. The rolling, swaying and heaving temporal variations are obtained when the multibody system is under the conditions of the static water along with the wave loads and the mean wind loads or the single pulse wind loads, respectively. The moment variations of each joint under the single pulse wind load are also gained. The numerical results showed that the swaying of the floating base is almost not influenced by the spreading time or form when the upper parts spread sequentially or synchronously, while the rolling and the heaving mainly depend on the spreading time and forms. The swaying and heaving motions are influenced significantly by the mean wind loads. The single pulse wind load also has influences on the dynamic responses. The torque of joint 3 and joint 4 in the single pulse wind environment may be twice that in the windless environment when the system spreads with 60 s duration.

  2. Interpretation of IEEE-854 floating-point standard and definition in the HOL system

    Science.gov (United States)

    Carreno, Victor A.

    1995-01-01

    The ANSI/IEEE Standard 854-1987 for floating-point arithmetic is interpreted by converting the lexical descriptions in the standard into mathematical conditional descriptions organized in tables. The standard is represented in higher-order logic within the framework of the HOL (Higher Order Logic) system. The paper is divided in two parts with the first part the interpretation and the second part the description in HOL.

  3. RESEARCH ON THE FLOATING OIL STORAGE SYSTEM FOR STRATEGIC PETROLEUM RESERVE

    Institute of Scientific and Technical Information of China (English)

    LI Wen-long

    2004-01-01

    The problem of petroleum safety is closely related to national politics and economics security and becomes one of key for discussion in China. The floating oil storage system has been proposed as a new facility for Strategic Petroleum Reserve (SPR) in our country. There are some differences in solving this problem. Although many of domestic research institutions are studying the project of SPR, the research is separate, and lack of comprehensive consideration, and fails to make a complete and scientific demonstration in many aspects, such as oil storage capacity, selection of storage sites, storage facilities, technologic and economic feasibility, risk assessment, etc. Therefore, no mature and systematic petroleum reserve theories have been formed up to now. Peoples argue the issue of objective of SPR, function, mode, cost, effect, etc. There are still many bifurcations, so, it is necessary to make more detailed demonstration, and provide some scientific decision-making strategy for the governments. In this paper, several significant problems are solved, for instance, the option of SPR facilities, the research on the principal characteristics of floating oil storage vessels, the analysis of mooring system for oil storage vessels, the design of breakwater and the calculation of failure probability, the risk assessment of floating oil storage system, etc.

  4. A system architecture for long duration free floating flight for military applications

    Energy Technology Data Exchange (ETDEWEB)

    Epley, L.E. (CIRRUS Aerospace Corp., Burke, VA (USA))

    1990-08-31

    Accessibility is today's space frontier. Our need for wide-band global communications, earth imaging an sensing, atmospheric measurements and military reconnaissance is endless but growing dependence on space-based systems raises concerns about potential vulnerability. Military commanders want space assets more accessible and under direct local control. As a result, a robust and low cost access to space-like capability has become a national priority. Buoyant vehicles, free floating in the middle stratosphere could provide the kind of cost effective access to space-like capability needed for a verity of missions. These vehicles are inexpensive, invisible and easily launched. Developments in payload electronics, atmospheric wind modeling and materials combined with ever-improving communications and navigation infrastructure are making balloon-borne concepts more attractive. The fundamental question is whether a free floating balloon, used in a pseudo-satellite role, has value in a military system. Flight tests are ongoing under NASA sponsorship. Following these tests NASA intends to use the vehicles for research in the Antarctic. The concept is being reviewed by other agencies interested in stratospheric research. We believe that LDFFF systems have applications in areas of communications, surveillance and other traditional satellite missions. Dialogue with the broader community of space users is needed to expand the applications. This report reviews the status of the recent flight tests and presents an overview of the concept of Long Duration Free Floating Flight for military applications. 12 refs., 13 figs.

  5. Lane Departure System Design using with IR Camera for Night-time Road Conditions

    Directory of Open Access Journals (Sweden)

    Osman Onur Akırmak

    2015-02-01

    Full Text Available Today, one of the largest areas of research and development in the automobile industry is road safety. Many deaths and injuries occur every year on public roads from accidents caused by sleepy drivers, that technology could have been used to prevent. Lane detection at night-time is an important issue in driving assistance systems. This paper deals with vision-based lane detection and tracking at night-time. This project consists of a research and development of an algorithm for automotive systems to detect the departure of vehicle from out of lane. Once the situation is detected, a warning is issued to the driver with sound and visual message through “Head Up Display” (HUD system. The lane departure is detected through the images obtained from a single IR camera, which identifies the departure at a satisfactory accuracy via improved quality of video stream. Our experimental results and accuracy evaluation show that our algorithm has good precision and our detecting method is suitable for night-time road conditions.

  6. Formulation of gastroretentive floating drug delivery system using hydrophilic polymers and its in vitro characterization

    Directory of Open Access Journals (Sweden)

    Venkata Srikanth Meka

    2014-04-01

    Full Text Available The aim of the present research is to formulate and evaluate the gastroretentive floating drug delivery system of antihypertensive drug, propranolol HCl. Gastroretentive floating tablets (GRFT were prepared by using a synthetic hydrophilic polymer polyethylene oxide of different grades such as PEO WSR N-12 K and PEO 18 NF as release retarding polymers and calcium carbonate as gas generating agent. The GRFT were compressed by direct compression strategy and the tablets were evaluated for physico-chemical properties, in vitro buoyancy, swelling studies, in vitro dissolution studies and release mechanism studies. From the dissolution and buoyancy studies, F 9 was selected as an optimized formulation. The optimized formulation followed zero order rate kinetics with non-Fickian diffusion mechanism. The optimized formulation was characterised with FTIR studies and observed no interaction between the drug and the polymers.

  7. On the precision attainable with various floating-point number systems

    CERN Document Server

    Brent, Richard P

    2010-01-01

    For scientific computations on a digital computer the set of real number is usually approximated by a finite set F of "floating-point" numbers. We compare the numerical accuracy possible with difference choices of F having approximately the same range and requiring the same word length. In particular, we compare different choices of base (or radix) in the usual floating-point systems. The emphasis is on the choice of F, not on the details of the number representation or the arithmetic, but both rounded and truncated arithmetic are considered. Theoretical results are given, and some simulations of typical floating-point computations (forming sums, solving systems of linear equations, finding eigenvalues) are described. If the leading fraction bit of a normalized base 2 number is not stored explicitly (saving a bit), and the criterion is to minimize the mean square roundoff error, then base 2 is best. If unnormalized numbers are allowed, so the first bit must be stored explicitly, then base 4 (or sometimes base...

  8. Experiment study of dynamics response for wind turbine system of floating foundation

    Science.gov (United States)

    Tang, You-gang; Song, Kai; Wang, Bin

    2015-12-01

    The floating foundation is designed to support a 1.5 MW wind turbine in 30 m water depth. With consideration of the viscous damping of foundation and heave plates, the amplitude-frequency response characteristics of the foundation are studied. By taking into account the elastic effect of blades and tower, the classic quasi-steady blade-element/momentum (BEM) theory is used to calculate the aerodynamic elastic loads. A coupled dynamic model of the turbine-foundationmooring lines is established to calculate the motion response of floating foundation under Kaimal wind spectrum and regular wave by using the FAST codes. The model experiment is carried out to test damping characteristics and natural motion behaviors of the wind turbine system. The dynamics response is tested by considering only waves and the joint action of wind and waves. It is shown that the wind turbine system can avoid resonances under the action of wind and waves. In addition, the heave motion of the floating foundation is induced by waves and the surge motion is induced by wind. The action of wind and waves is of significance for pitch.

  9. A novel liquid effervescent floating delivery system for sustained drug delivery.

    Science.gov (United States)

    Ibrahim, H K

    2009-08-01

    An effervescent floating liquid formulation with in situ gelling properties has been assessed for its potential for sustaining drug delivery and targeting. The formulation consisted of sodium alginate and glyceryl monooleate (GMO). The developed formulation met all pre-requisites to become an in situ gelling floating system and it gelled and floated instantaneously in the pH conditions of the stomach. Moreover, the gels formed in situ remained intact for more than 48 h to facilitate sustained release of drugs. Increasing the mannuronic acid ratio of sodium alginate and the GMO concentration significantly retarded the release rate and extent. The in vitro release of both hydrophilic and hydrophobic drugs from the prepared formulations followed root-time kinetics during the sustained release period. Replacing the free drug with drug encapsulated microspheres enabled tailoring of the release profile and achieved zero-order release kinetics. The system retained its appearance and rheological properties for 12 months at ambient conditions. The values of the similarity factor Sd proved the absence of any significant difference in the release profile upon storage.

  10. Preformulation studies and optimization of sodium alginate based floating drug delivery system for eradication of Helicobacter pylori.

    Science.gov (United States)

    Diós, Péter; Nagy, Sándor; Pál, Szilárd; Pernecker, Tivadar; Kocsis, Béla; Budán, Ferenc; Horváth, Ildikó; Szigeti, Krisztián; Bölcskei, Kata; Máthé, Domokos; Dévay, Attila

    2015-10-01

    The aim of this study was to design a local, floating, mucoadhesive drug delivery system containing metronidazole for Helicobacter pylori eradication. Face-centered central composite design (with three factors, in three levels) was used for evaluation and optimization of in vitro floating and dissolution studies. Sodium alginate (X1), low substituted hydroxypropyl cellulose (L-HPC B1, X2) and sodium bicarbonate (X3) concentrations were the independent variables in the development of effervescent floating tablets. All tablets showed acceptable physicochemical properties. Statistical analysis revealed that tablets with 5.00% sodium alginate, 38.63% L-HPC B1 and 8.45% sodium bicarbonate content showed promising in vitro floating and dissolution properties for further examinations. Optimized floating tablets expressed remarkable floating force. Their in vitro dissolution studies were compared with two commercially available non-floating metronidazole products and then microbiologically detected dissolution, ex vivo detachment force, rheological mucoadhesion studies and compatibility studies were carried out. Remarkable similarity (f1, f2) between in vitro spectrophotometrically and microbiologically detected dissolutions was found. Studies revealed significant ex vivo mucoadhesion of optimized tablets, which was considerably increased by L-HPC. In vivo X-ray CT studies of optimized tablets showed 8h gastroretention in rats represented by an animation prepared by special CT technique. Copyright © 2015 Elsevier B.V. All rights reserved.

  11. Effectiveness of a night radiative cooling system in different geographical latitudes

    Science.gov (United States)

    Tsoy, A. P.; Granovskiy, A. S.; Baranenko, A. V.; Tsoy, D. A.

    2017-08-01

    Growth of world energy consumption and depletion of energy resources make humanity to constantly work on the creation of the energy efficient technologies and increase usage of the alternative and renewable sources of energy. One of such alternative sources of energy is the night radiative cooling (NRC). NRC is an alternative and renewable source of energy, derived from the effective radiation of the Earth into the Space. If the given surface is located so that it looks to the night sky, then under the particular condition more energy can be generated under the effect of radiative cooling, than received from the atmosphere. As a result the temperature of the surface can be kept lower than the temperature of the ambient air. This effect can be used for creation of the refrigeration systems with the low energy consumption and as a result lower negative influence on the environment. During the research it has been identified that the possibility of the NRC usage is mostly predetermined by the specifics of the climate of the each region. In particular climate conditions the refrigeration systems working on night radiative cooling will be more effective that in others.

  12. Case study of the development of the Target Acquisition Designation/Pilot Night Vision System

    OpenAIRE

    2002-01-01

    Approved for public release; distribution in unlimited. This thesis is a case study of the extent to which a series of factors influenced development of the U.S. Army Target Acquisition Designation System/Pilot Night Vision System (TADS/PNVS). This study is one of a series being prepared under an ongoing research effort sponsored by Headquarters U.S. Army Material Command (AMC). These studies will look at various weapon systems that participated in Operation Desert Storm (ODS) and will stu...

  13. THE STUDY ON THE EFFECT OF FORMULATION VARIABLES ON IN VITRO FLOATING TIME AND THE RELEASE PROPERTIES OF A FLOATING DRUG DELIVERY SYSTEM BY A STATISTICAL OPTIMIZATION TECHNIQUE

    Directory of Open Access Journals (Sweden)

    C. NARENDRA

    2008-03-01

    Full Text Available The present investigation concerns the evaluation of the effect of formulation variables on in vitro floating time and the release properties in developing a floating drug delivery system (FDDS containing a highly water soluble drug metoprolol tartrate (MT in the presence of a gas generating agent. A 32 full factorial design was employed in formulating the FDDS containing hydroxyl propylmethylcellulose (HPMC K4M and sodium carboxymethylcellulose (NaCMC as swellable polymers. Drug-to-polymer ratio and polymer-to-polymer ratio were included as independent variables. The main effect and the interaction terms were quantitatively evaluated by a quadratic model to predict formulations with the floating time desired, and the release properties. It was found that only drug-to-polymer ratio and its quadratic term were found to be significantly affective for all the response variables. Non-Fickian transport was confirmed as a release mechanism from the optimized formulations. The desirability function was used to optimize the response variables, each having a different target, and the observed responses were highly agreed with experimental values. The results demonstrate the feasibility of the model in the development of FDDS containing a highly water-soluble drug MT.

  14. Floating Ultrasonic Transducer Inspection System and Method for Nondestructive Evaluation

    Science.gov (United States)

    Zalameda, Joseph N. (Inventor); Johnston, Patrick H. (Inventor)

    2016-01-01

    A method for inspecting a structural sample using ultrasonic energy includes positioning an ultrasonic transducer adjacent to a surface of the sample, and then transmitting ultrasonic energy into the sample. Force pulses are applied to the transducer concurrently with transmission of the ultrasonic energy. A host machine processes ultrasonic return pulses from an ultrasonic pulser/receiver to quantify attenuation of the ultrasonic energy within the sample. The host machine detects a defect in the sample using the quantified level of attenuation. The method may include positioning a dry couplant between an ultrasonic transducer and the surface. A system includes an actuator, an ultrasonic transducer, a dry couplant between the transducer the sample, a scanning device that moves the actuator and transducer, and a measurement system having a pulsed actuator power supply, an ultrasonic pulser/receiver, and a host machine that executes the above method.

  15. Formulation and evaluation of gastroretentive microballoons containing baclofen for a floating oral controlled drug delivery system.

    Science.gov (United States)

    Dube, T S; Ranpise, N S; Ranade, A N

    2014-01-01

    The objective of the present study was to fabricate and evaluate a multiparticulate oral gastroretentive dosage form of baclofen characterized by a central large cavity (hollow core) promoting unmitigated floatation with practical applications to alleviate the signs and symptoms of spasticity and muscular rigidity. Solvent diffusion and evaporation procedure were applied to prepare floating microspheres with a central large cavity using various combinations of ethylcellulose (release retardant) and HPMC K4M (release modifier) dissolved in a mixture of dichloromethane and methanol (2:1). The obtained microspheres (700-1000 µm) exhibit excellent floating ability (86 ± 2.00%) and release characteristics with entrapment efficiency of 95.2 ± 0.32%. Microspheres fabricated with ethylcellulose to HPMC K4M in the ratio 8.5:1.5 released 98.67% of the entrapped drug in 12 h. Muscle relaxation caused by baclofen microspheres impairs the rotarod performance for more than 12 h. Abdominal X-ray images showed that the gastroretention period of the floating barium sulfate- labeled microspheres was no less than 10 h. The buoyant baclofen microspheres provide a promising gastroretentive drug delivery system to deliver baclofen in spastic patients with a sustained release rate.

  16. Aero-hydro-elastic simulation platform for wave energy systems and floating wind turbines

    Energy Technology Data Exchange (ETDEWEB)

    Kallesoee, B.S.

    2011-01-15

    This report present results from the PSO project 2008-1-10092 entitled Aero-Hydro-Elastic Simulation Platform for Wave Energy Systems and floating Wind Turbines that deals with measurements, modelling and simulations of the world's first combined wave and wind energy platform. The floating energy conversion platform, Poseidon, is owned and operated by Floating Power Plant A/S. The platform has been operating for two test periods; one period where it was operating as a wave energy conversion platform only and one period where the three turbines was mounted and the platform operated as a combined wind and wave energy platform. The PSO project has equipped the platform with comprehensive measurements equipment for measuring platform motion, wave and wind conditions and turbine loads. Data from the first test period has been used for determine if the turbine could be mounted on the platform. Preliminary analysis of data from the second test period indicates that the platform is suitable as wind turbine foundation and that the turbines reduce the platform motion. (Author)

  17. Night terror

    Science.gov (United States)

    Pavor nocturnus; Sleep terror disorder ... The cause is unknown, but night terrors may be triggered by: Fever Lack of sleep Periods of emotional tension , stress , or conflict Night terrors are most common in children ...

  18. Synthesized night vision goggle

    Science.gov (United States)

    Zhou, Haixian

    2000-06-01

    A Synthesized Night Vision Goggle that will be described int his paper is a new type of night vision goggle with multiple functions. It consists of three parts: main observing system, picture--superimposed system (or Cathode Ray Tube system) and Charge-Coupled Device system.

  19. Application of a floating point systems AP190L array processor to finite element analysis

    Energy Technology Data Exchange (ETDEWEB)

    Young, R.C.

    1982-04-01

    This report discusses the implementation of a finite element program on a Floating Point Systems AP190L array processor attached to a Univac 1182 host computer. The array processor was used to perform all calculations on the global system of linear equations including matrix assembly, matrix factoring and vector solution. A large scratch disk was attached directly to the array processor for storing the factored matrix. The remaining calculations, including data preparation, element matrix formation, stress integration and output display were performed by the host computer.

  20. Invariant electro-optical system for deflection measurement of floating docks

    Science.gov (United States)

    Gorbachev, Alexey A.; Hoang, Anh Phuong

    2017-06-01

    An electro-optical system for deflection measurement of floating docks is represented in this paper. This system contains a base unit with two measurement channels observing opposite directions of the dock. It also includes a set of reference marks and an industrial computer. The measurement unit contains of a camera with long focal-length lens and a beam splitter. The effect of the beam splitter turning point on the image position of the reference mark on the camera is analyzed as well in this paper.

  1. Chitosan superporous hydrogel composite-based floating drug delivery system: A newer formulation approach

    Directory of Open Access Journals (Sweden)

    Hitesh Chavda

    2010-01-01

    Full Text Available Objective: In this study efforts have been made to design a drug delivery system based on a superporous hydrogel composite, for floating and sustained delivery of Ranitidine hydrochloride. Materials and Methods: The characterization studies were performed by the measurement of apparent density, porosity, swelling studies, mechanical strength studies, and scanning electron microscopy studies. The prepared formulation was evaluated for buoyant behavior, in vitro drug release, kinetics of drug release, and stability. The release profile of Ranitidine hydrochloride was investigated by changing the release retardant polymer in the formulation. To ascertain the kinetics of drug release, the drug release profiles were fitted to mathematical models that included zero-order, first-order, Higuchi, Hixson-Crowell, Korsmeyer-Peppas, Weibull, and Hopfenberg models. Results: Scanning electron microscopy images clearly indicated the formation of interconnected pores and capillary channels, and cross-linked Chitosan molecules were observed around the peripheries of the pores. The prepared drug delivery system floated and delivered the Ranitidine hydrochloride for about 17 hours. The in vitro drug release from the proposed system was best explained by the Korsmeyer-Peppas model. The values of the diffusion exponent in the Korsmeyer-Peppas model ranged between 0.47 ± 0.02 and 0.66 ± 0.02, which appeared to indicate a coupling of the diffusion and erosion mechanisms, anomalous non-Fickian transport. Conclusion: It was concluded that the proposed floating drug delivery system, based on the superporous hydrogel composite containing Chitosan as a composite material, is promising for stomach-specific delivery of Ranitidine hydrochloride.

  2. Use of Circadian Lighting System to improve night shift alertness and performance of NRC Headquarters Operations Officers

    Energy Technology Data Exchange (ETDEWEB)

    Baker, T.L.; Morisseau, D.; Murphy, N.M. [ShiftWork Systems, Cambridge, MA (United States)] [and others

    1995-04-01

    The Nuclear Regulatory Commission`s (NRC) Headquarters Operations Officers (HOOs) receive and respond to events reported in the nuclear industry on a 24-hour basis. The HOOs have reported reduced alertness on the night shift, leading to a potential deterioration in their on-shift cognitive performance during the early morning hours. For some HOOs, maladaptation to the night shift was also reported to be the principal cause of: (a) reduced alertness during the commute to and from work, (b) poor sleep quality, and (c) personal lifestyle problems. ShiftWork Systems, Inc. (SWS) designed and installed a Circadian Lighting System (CLS) at both the Bethesda and Rockville HOO stations with the goal of facilitating the HOOs physiological adjustment to their night shift schedules. The data indicate the following findings: less subjective fatigue on night shifts; improved night shift alertness and mental performance; higher HOO confidence in their ability to assess event reports; longer, deeper and more restorative day sleep after night duty shifts; swifter adaptation to night work; and a safer commute, particularly for those with extensive drives.

  3. Night vision imaging system design, integration and verification in spacecraft vacuum thermal test

    Science.gov (United States)

    Shang, Yonghong; Wang, Jing; Gong, Zhe; Li, Xiyuan; Pei, Yifei; Bai, Tingzhu; Zhen, Haijing

    2015-08-01

    The purposes of spacecraft vacuum thermal test are to characterize the thermal control systems of the spacecraft and its component in its cruise configuration and to allow for early retirement of risks associated with mission-specific and novel thermal designs. The orbit heat flux is simulating by infrared lamp, infrared cage or electric heater. As infrared cage and electric heater do not emit visible light, or infrared lamp just emits limited visible light test, ordinary camera could not operate due to low luminous density in test. Moreover, some special instruments such as satellite-borne infrared sensors are sensitive to visible light and it couldn't compensate light during test. For improving the ability of fine monitoring on spacecraft and exhibition of test progress in condition of ultra-low luminous density, night vision imaging system is designed and integrated by BISEE. System is consist of high-gain image intensifier ICCD camera, assistant luminance system, glare protect system, thermal control system and computer control system. The multi-frame accumulation target detect technology is adopted for high quality image recognition in captive test. Optical system, mechanical system and electrical system are designed and integrated highly adaptable to vacuum environment. Molybdenum/Polyimide thin film electrical heater controls the temperature of ICCD camera. The results of performance validation test shown that system could operate under vacuum thermal environment of 1.33×10-3Pa vacuum degree and 100K shroud temperature in the space environment simulator, and its working temperature is maintains at 5° during two-day test. The night vision imaging system could obtain video quality of 60lp/mm resolving power.

  4. Development of an aviator's helmet-mounted night-vision goggle system

    Science.gov (United States)

    Wilson, Gerry H.; McFarlane, Robert J.

    1990-10-01

    Helmet Mounted Systems (HMS) must be lightweight, balanced and compatible with life support and head protection assemblies. This paper discusses the design of one particular HMS, the GEC Ferranti NITE-OP/NIGHTBIRD aviator's Night Vision Goggle (NVG) developed under contracts to the Ministry of Defence for all three services in the United Kingdom (UK) for Rotary Wing and fast jet aircraft. The existing equipment constraints, safety, human factor and optical performance requirements are discussed before the design solution is presented after consideration of these material and manufacturing options.

  5. Effects of floating-point non-associativity on numerical computations on massively multithreaded systems

    Energy Technology Data Exchange (ETDEWEB)

    Villa, Oreste; Chavarría-Miranda, Daniel; Gurumoorthi, Vidhya; Marquez, Andres; Krishnamoorthy, Sriram

    2009-05-03

    Floating-point addition and multiplication are not necessarily associative. When performing those operations over large numbers of operands with different magnitudes, the order in which individual operations are performed can affect the final result. On massively multithreaded systems, when performing parallel reductions, the non-deterministic nature of numerical operation interleaving can lead to non-deterministic numerical results. We have investigated the effect of this problem on the convergence of a conjugate gradient calculation used as part of a power grid analysis application.

  6. The Use of Adaptive Traffic Signal Systems Based on Floating Car Data

    Directory of Open Access Journals (Sweden)

    Vittorio Astarita

    2017-01-01

    Full Text Available This paper presents a simple concept which has not been, up to now, thoroughly explored in scientific research: the use of information coming from the network of Internet connected mobile devices (on vehicles to regulate traffic light systems. Three large-scale changes are going to shape the future of transportation and could lead to the regulation of traffic signal system based on floating car data (FCD: (i the implementation of Internet connected cars with global navigation satellite (GNSS system receivers and the autonomous car revolution; (ii the spreading of mobile cooperative Web 2.0 and the extension to connected vehicles; (iii an increasing need for sustainability of transportation in terms of energy efficiency, traffic safety, and environmental issues. Up to now, the concept of floating car data (FCD has only been extensively used to obtain traffic information and estimate traffic parameters. Traffic lights regulation based on FCD technology has not been fully researched since the implementation requires new ideas and algorithms. This paper intends to provide a seminal insight into the important issue of adaptive traffic light based on FCD by presenting ideas that can be useful to researchers and engineers in the long-term task of developing new algorithms and systems that may revolutionize the way traffic lights are regulated.

  7. Tech-IA floating system introduced in urban wastewater treatment plants in the Veneto region - Italy.

    Science.gov (United States)

    Mietto, Anna; Borin, Maurizio; Salvato, Michela; Ronco, Paolo; Tadiello, Nicola

    2013-01-01

    The performance of three integrated wetland treatment plants (horizontal sub-surface flow (h-SSF) and floating treatment wetland (FTW) with differentiated primary treatments) designed for treating domestic wastewater was investigated, monitoring total (TN), nitrate (NO3-N), nitrite (NO2-N) and ammonia nitrogen (NH4-N), total (TP) and phosphate phosphorus (PO4-P), chemical (COD) and biological oxygen demand (BOD5), and dissolved oxygen (DO) at the inlet and outlet of each wetland section from February 2011 to June 2012. Sediments settled in the FTW were collected and analyzed. The growth of plants in each system was also monitored, observing their general conditions. The chemical-physical characteristics of the pretreated domestic wastewater depended on the primary treatment installed. During the monitoring period we observed different reduction performance of the wetland sector in the three sites. In general, the wetland systems demonstrated the capacity to reduce TN, COD, BOD5 and Escherichia coli, whereas NO3-N and NH4-N removal was strictly influenced by the chemical conditions, in particular DO concentration, in the h-SSF and FTW. Vegetation (Phragmites australis, Alnus glutinosa and Salix eleagnos) was well established in the h-SSF as well as in the floating elements (Iris pseudacorus), although there were some signs of predation. FTW is a relatively novel wetland system, so the results obtained from this study can pave the way for the application of this technology.

  8. Development of sustained release floating drug delivery system for norfloxacin: in vitro and in vivo evaluation.

    Science.gov (United States)

    Guguloth, Mohan; Bomma, Ramesh; Veerabrahma, Kishan

    2011-01-01

    gastroretentive drug delivery systems. Gastroretentive floating tablets of norfloxcin were developed by employing three different polymers, which prolonged the drug release from the dosage forms. Tablet floatation was achieved by an effervescent mechanism. Citric acid at different concentrations was used in formulations to provide an acidic microenvironment. The prepared tablets were characterized for hardness, weight variation, thickness, friability, floating lag time, and dissolution. Around 12 tablet formulations were prepared as a continuation of the previous work. The best formulation (F4c) was selected based on in vitro characteristics and used in vivo radiographic studies by incorporating barium sulphate as a radio-opaque agent. The tablets remained in the stomach for about 205 ± 8.4 min. Bioavailability studies were conducted in healthy male human volunteers, and the pharmacokinetic parameters of the best formulation were compared with that of the marketed conventional (Norbid) tablet. The increased bioavailability of the developed formulation was found to be 16.27%.

  9. Model-based fault detection of blade pitch system in floating wind turbines

    Science.gov (United States)

    Cho, S.; Gao, Z.; Moan, T.

    2016-09-01

    This paper presents a model-based scheme for fault detection of a blade pitch system in floating wind turbines. A blade pitch system is one of the most critical components due to its effect on the operational safety and the dynamics of wind turbines. Faults in this system should be detected at the early stage to prevent failures. To detect faults of blade pitch actuators and sensors, an appropriate observer should be designed to estimate the states of the system. Residuals are generated by a Kalman filter and a threshold based on H optimization, and linear matrix inequality (LMI) is used for residual evaluation. The proposed method is demonstrated in a case study that bias and fixed output in pitch sensors and stuck in pitch actuators. The simulation results show that the proposed method detects different realistic fault scenarios of wind turbines under the stochastic external winds.

  10. Systematic analysis on mooring systems of floating structures; Futai keiryuho ni kansuru keitoteki kenkyu

    Energy Technology Data Exchange (ETDEWEB)

    Yoshida, K.; Suzuki, H.; Ide, T. [The University of Tokyo, Tokyo (Japan)

    1996-12-31

    Discussed herein are mooring performance requirements of the new types of marine structures now proposed, and characteristic ranges and future expansion potential of the existing mooring systems. The mooring systems studied for floating structures are catenary, single point (multi-leg and single-leg types), fixed structure with fender and tension leg mooring systems. The studied items include extraction of the elements that constitute rigidity of the spring for horizontal mooring, survey on and data collection for each element, determination of element ranges, programs for mooring analysis, assessment of mooring characteristic ranges, and potential development of the characteristic ranges. It is concluded that the existing systems with their current characteristic ranges and future possibility are insufficient for the future marine structures. It is therefore necessary to develop new mooring concepts, instead of expanding the current concepts, in order to meet the mooring performance requirements for the new marine structures. 14 refs., 9 figs., 11 tabs.

  11. Systematic analysis on mooring systems of floating structures; Futai keiryuho ni kansuru keitoteki kenkyu

    Energy Technology Data Exchange (ETDEWEB)

    Yoshida, K.; Suzuki, H.; Ide, T. [The University of Tokyo, Tokyo (Japan)

    1996-12-31

    Discussed herein are mooring performance requirements of the new types of marine structures now proposed, and characteristic ranges and future expansion potential of the existing mooring systems. The mooring systems studied for floating structures are catenary, single point (multi-leg and single-leg types), fixed structure with fender and tension leg mooring systems. The studied items include extraction of the elements that constitute rigidity of the spring for horizontal mooring, survey on and data collection for each element, determination of element ranges, programs for mooring analysis, assessment of mooring characteristic ranges, and potential development of the characteristic ranges. It is concluded that the existing systems with their current characteristic ranges and future possibility are insufficient for the future marine structures. It is therefore necessary to develop new mooring concepts, instead of expanding the current concepts, in order to meet the mooring performance requirements for the new marine structures. 14 refs., 9 figs., 11 tabs.

  12. Comparison between GEOCOR IV SIGN-BIT an DFS-V 16-bit floating point recording systems

    Energy Technology Data Exchange (ETDEWEB)

    Hollis, D.D.; Givens, R.

    1986-04-01

    A Vibroseis line was repeatedly shot in Andrews County, Texas. The first shot used a DFS-V 16-bit floating point recording system with parameters optimized for that particular recording system and subsurface geology. Then the line was shot with a GEOCOR IV SIGN-BIT recording system, once using the same parameters as on the floating point recording system, then with parameters optimized for a SIGN-BIT recording system - mainly higher fold, closer channel spacing, and using the VARISWEEP technique. The three lines were processed to stacked sections using identical processing parameters. When the 16-bit floating point recording system is compared to the SIGN-BIT system with identical parameters, the results indicate the systems are equivalent for Vibroseis recording. Basic primary reflections are similar in signal to noise and frequency. Multiple reflection energy is greater on the floating point section. However, the results differ when the two systems are compared using optimal parameters for each system. The SIGN-BIT section had shallower data because the receiver line has no gapping. The SIGN-BIT system also had better temporal and spatial resolution because channel spacing was reduced and a different sweep technique was used.

  13. Design and Modelling of Water Chilling Production System by the Combined Effects of Evaporation and Night Sky Radiation

    Directory of Open Access Journals (Sweden)

    Ahmed Y. Taha Al-Zubaydi

    2014-01-01

    Full Text Available The design and mathematical modelling of thermal radiator panel to be used primarily to measure night sky radiation wet coated surface is presented in this paper. The panel consists of an upper dry surface coated aluminium sheet laminated to an ethylene vinyl acetate foam backing block as an insulation. Water is sprayed onto the surface of the panel so that an evaporative cooling effect is gained in addition to the radiation effect; the surface of a panel then is wetted in order to study and measure the night sky radiation from the panel wet surface. In this case, the measuring water is circulated over the upper face of this panel during night time. Initial TRNSYS simulations for the performance of the system are presented and it is planned to use the panel as calibrated instruments for discriminating between the cooling effects of night sky radiation and evaporation.

  14. Statistical optimization of ranitidine HCl floating pulsatile delivery system for chronotherapy of nocturnal acid breakthrough.

    Science.gov (United States)

    Roy, Pallab; Shahiwala, Aliasgar

    2009-06-28

    Present work conceptualizes a specific technology, based on combining floating and pulsatile principles to develop drug delivery system, intended for chronotherapy in nocturnal acid breakthrough. This approach will be achieved by using a programmed delivery of ranitidine hydrochloride from a floating tablet with time-lagged coating. In this study, investigation of the functionality of the outer polymer coating to predict lag time and drug release was statistically analyzed using the response surface methodology (RSM). RSM was employed for designing of the experiment, generation of mathematical models and optimization study. The chosen independent variables, i.e. percentage weight ratios of ethyl cellulose to hydroxypropyl methyl cellulose in the coating formulation and coating level (% weight gain) were optimized with a 3(2) full factorial design. Lag time prior to drug release and cumulative percentage drug release in 7h were selected as responses. Results revealed that both, the coating composition and coating level, are significant factors affecting drug release profile. A second-order polynomial equation fitted to the data was used to predict the responses in the optimal region. The optimized formulation prepared according to computer-determined levels provided a release profile, which was close to the predicted values. The proposed mathematical model is found to be robust and accurate for optimization of time-lagged coating formulations for programmable pulsatile release of ranitidine hydrochloride, consistent with the demands of nocturnal acid breakthrough.

  15. A multiple unit floating drug delivery system of piroxicam using eudragit polymer

    Directory of Open Access Journals (Sweden)

    Kale R

    2007-01-01

    Full Text Available A floating drug delivery system of piroxicam in the form of microspheres was prepared using an enteric polymer and emulsification solvent-evaporation method. The microspheres remained buoyant continuously over the surface of acidic media containing surfactant for a period of 8-12 h in vitro . Differential scanning calorimetry and X-ray diffraction studies showed that drug incorporated in the outer shell of the polymer was completely amorphous. Scanning electron micrographs indicated that the microsphere is perfect sphere with an internal hollow cavity enclosed by a rigid shell of polymer. The micromeritic properties of microspheres were found to be much improved compared with original drug crystals. The in vitro drug release behavior of the floating microspheres was characterized as an enteric property. Polymer being soluble above pH 7.0, the drug release rates from microspheres changed dramatically above and below pH 7.0. At intestinal pH the drug release was faster and continuous as compared to the amount released at gastric pH.

  16. Sensor fusion to enable next generation low cost Night Vision systems

    Science.gov (United States)

    Schweiger, R.; Franz, S.; Löhlein, O.; Ritter, W.; Källhammer, J.-E.; Franks, J.; Krekels, T.

    2010-04-01

    The next generation of automotive Night Vision Enhancement systems offers automatic pedestrian recognition with a performance beyond current Night Vision systems at a lower cost. This will allow high market penetration, covering the luxury as well as compact car segments. Improved performance can be achieved by fusing a Far Infrared (FIR) sensor with a Near Infrared (NIR) sensor. However, fusing with today's FIR systems will be too costly to get a high market penetration. The main cost drivers of the FIR system are its resolution and its sensitivity. Sensor cost is largely determined by sensor die size. Fewer and smaller pixels will reduce die size but also resolution and sensitivity. Sensitivity limits are mainly determined by inclement weather performance. Sensitivity requirements should be matched to the possibilities of low cost FIR optics, especially implications of molding of highly complex optical surfaces. As a FIR sensor specified for fusion can have lower resolution as well as lower sensitivity, fusing FIR and NIR can solve performance and cost problems. To allow compensation of FIR-sensor degradation on the pedestrian detection capabilities, a fusion approach called MultiSensorBoosting is presented that produces a classifier holding highly discriminative sub-pixel features from both sensors at once. The algorithm is applied on data with different resolution and on data obtained from cameras with varying optics to incorporate various sensor sensitivities. As it is not feasible to record representative data with all different sensor configurations, transformation routines on existing high resolution data recorded with high sensitivity cameras are investigated in order to determine the effects of lower resolution and lower sensitivity to the overall detection performance. This paper also gives an overview of the first results showing that a reduction of FIR sensor resolution can be compensated using fusion techniques and a reduction of sensitivity can be

  17. Quantum chemical calculations using the Floating Point Systems, Inc. Model 164 attached processor

    Energy Technology Data Exchange (ETDEWEB)

    Shepard, R.; Bair, R.A.; Eades, R.A.; Wagner, A.F.; Davis, M.J.; Harding, L.B.; Dunning, T.H. Jr.

    1983-01-01

    The Theoretical Chemistry Group at Argonne National Laboratory has had a Floating Point System, Inc., Model 164 Attached Processor (FPS-164) for several months. Actual production calculations, as well as benchmark calculations, indicate that the FPS-164 is capable of performance comparable to large mainframe computers, the groups experience with the FPS-164 includes the conversion of a complete system of electronic structure codes, including integral evaluation programs, generalized valence bond programs, integral transformation programs, and unitary group configuration interaction programs, and two classical trajectory codes. Timings of these programs at various levels of optimization along with estimates of the amount of effort required to make the necessary program modifications are discussed. 10 references, 2 figures, 2 tables.

  18. Wave scattering and radiation by a dual porous-wall attached floating body system

    Science.gov (United States)

    Qiao, Weiliang; Duan, Wenqi; Ma, Laihao

    2017-05-01

    In the present study, an analytical solution of a sinusoidal wave propagating through a dual porous-wall attached floating body system is presented with application of the two-dimensional linear potential theory. Two sets of orthogonal Eigen functions are utilized to determine the velocity potential and associated unknown coefficients in each subdomain. The reflection coefficients and transmission coefficients as well as the net hydrodynamic force along surge, heave and pitch are also formulated. The results show that the wave reflection and transmission effects are depended heavily on the relative water depth and the porous properties. Also, it can be found that the porous properties play an important role for the pitch forces acting on this system, however, the influences on the surge and heave forces are less important.

  19. Simulated floating zone method

    OpenAIRE

    Ozawa, Ryo; Kato, Yasuyuki; Motome, Yukitoshi

    2016-01-01

    This paper provides the simulated floating zone (SFZ) method that is an efficient simulation technique to obtain thermal equilibrium states, especially useful when domain formation prevents the system from reaching a spatially-uniform stable state. In the SFZ method, the system is heated up locally, and the heated region is steadily shifted, similar to the floating zone method for growing a single crystal with less lattice defect and impurity in experiments. We demonstrate that the SFZ method...

  20. Design and statistical optimization of an effervescent floating drug delivery system of theophylline using response surface methodology

    Directory of Open Access Journals (Sweden)

    Srikanth Meka Venkata

    2016-03-01

    Full Text Available The aim of this research was to formulate effervescent floating drug delivery systems of theophylline using different release retarding polymers such as ethyl cellulose, Eudragit® L100, xanthan gum and polyethylene oxide (PEO N12K. Sodium bicarbonate was used as a gas generating agent. Direct compression was used to formulate floating tablets and the tablets were evaluated for their physicochemical and dissolution characteristics. PEO based formulations produced better drug release properties than other formulations. Hence, it was further optimized by central composite design. Further subjects of research were the effect of formulation variables on floating lag time and the percentage of drug released at the seventh hour (D7h. The optimum quantities of PEO and sodium bicarbonate, which had the highest desirability close to 1.0, were chosen as the statistically optimized formulation. No interaction was found between theophylline and PEO by Fourier Transformation Infrared spectroscopy (FTIR and Differential Scanning Calorimetry (DSC studies.

  1. FORMULATION AND EVALUATION OF FLOATING DRUG DELIVERY SYSTEM OF AMOXYCILLIN TRIHYDRATE

    Directory of Open Access Journals (Sweden)

    Marella Radhakrishna

    2012-08-01

    Full Text Available The present study was designed to formulate and evaluate balanced Floating Drug Delivery Systems as controlled release modules, which prolongs the release rate of the drugs. Amoxycillin is an anti- bacterial acts by inhibiting the synthesis of bacterial cell walls. It inhibits cross-linkage between the linear peptidoglycan polymer chains that make up a major component of the cell walls of both Gram-positive and Gram-negative bacteria. Helicobacter pylori exists in the gastric mucous layer or epithelial cell surfaces. Thus, the concentration and resident time of Amoxycillin trihydrate in stomach would be effective for complete eradication of Helicobacter pylori. Formulation of Amoxycillin trihydrate as gastro retentive drug delivery systems (GRDDS is especially advantageous over other prolonged type drug delivery systems and conventional tablets because the drug is having absorption window in upper part of gastro intestinal tract and having relatively short half life. Amoxycillin trihydrate was taken as the model drug to optimized formulations was prepared. The single unit floating matrix tablets of Amoxycillin trihydrate with different natural and synthetic polymers such has HPMC K4M, HPMC K15M, HPMC K100M by taking single polymer in the formulation.The evaluation of physicochemical characteristics of all formulations and to carryout in vitro drug release studies using USP XXIV apparatus and data were analyzed at 272nm.The drug release of Amoxycillin trihydrate from formulations containing HPMC K4M,HPMC K15M followed zero order kinetics where has formulation containing combination of xanthan gum(natural polymer and HPMC K100M(synthetic polymer followed Higuchi and First-order pattern respectively. Of all the formulations in which combination of polymers has retarded the drug successfully upto 12 hours.

  2. Experimental and numerical investigation of the roll motion behavior of a floating liquefied natural gas system

    Science.gov (United States)

    Zhao, WenHua; Yang, JianMin; Hu, ZhiQiang; Xiao, LongFei; Peng, Tao

    2013-03-01

    The present paper does an experimental and numerical investigation of the hydrodynamic interaction and the response of a single point turret-moored Floating Liquefied Natural Gas (FLNG) system, which is a new type of floating LNG (Liquid Natural Gas) platform that consists of a ship-type FPSO hull equipped with LNG storage tanks and liquefaction plants. In particular, this study focuses on the investigation of the roll response of FLNG hull in free-decay motions, white noise waves and also in irregular waves. Model tests of the FLNG system in 60%H filling condition excited by both white noise waves and irregular waves combined with steady wind and current have been carried out. Response Amplitude Operators (RAOs) and time histories of the responses are obtained for sway, roll and yaw motions. Obvious Low Frequency (LF) components of the roll motions are observed, which may be out of expectation. To facilitate the physical understanding of this phenomenon, we filter the roll motions at the period of 30 s into two parts: the Wave Frequency (WF) motions and the Low Frequency (LF) motions respectively. The results indicate that the LF motions are closely related to the sway and yaw motions. Possible reasons for the presence of the LF motions of roll have been discussed in detail, through the comparison with the sway and yaw motions. As for the numerical part, the simulation of the modeled case is conducted with the help of the software SESAM®. A good agreement between experiments and calculations is reported within the scope of trends. However, the numerical simulations should be further improved for the prediction of the FLNG system in the heading sea.

  3. Floating Chip Mounting System Driven by Repulsive Force of Permanent Magnets for Multiple On-Site SPR Immunoassay Measurements

    Directory of Open Access Journals (Sweden)

    Emi Tamechika

    2012-10-01

    Full Text Available We have developed a measurement chip installation/removal mechanism for a surface plasmon resonance (SPR immunoassay analysis instrument designed for frequent testing, which requires a rapid and easy technique for changing chips. The key components of the mechanism are refractive index matching gel coated on the rear of the SPR chip and a float that presses the chip down. The refractive index matching gel made it possible to optically couple the chip and the prism of the SPR instrument easily via elastic deformation with no air bubbles. The float has an autonomous attitude control function that keeps the chip parallel in relation to the SPR instrument by employing the repulsive force of permanent magnets between the float and a float guide located in the SPR instrument. This function is realized by balancing the upward elastic force of the gel and the downward force of the float, which experiences a leveling force from the float guide. This system makes it possible to start an SPR measurement immediately after chip installation and to remove the chip immediately after the measurement with a simple and easy method that does not require any fine adjustment. Our sensor chip, which we installed using this mounting system, successfully performed an immunoassay measurement on a model antigen (spiked human-IgG in a model real sample (non-homogenized milk that included many kinds of interfering foreign substances without any sample pre-treatment. The ease of the chip installation/removal operation and simple measurement procedure are suitable for frequent on-site agricultural, environmental and medical testing.

  4. Floating chip mounting system driven by repulsive force of permanent magnets for multiple on-site SPR immunoassay measurements.

    Science.gov (United States)

    Horiuchi, Tsutomu; Tobita, Tatsuya; Miura, Toru; Iwasaki, Yuzuru; Seyama, Michiko; Inoue, Suzuyo; Takahashi, Jun-ichi; Haga, Tsuneyuki; Tamechika, Emi

    2012-10-17

    We have developed a measurement chip installation/removal mechanism for a surface plasmon resonance (SPR) immunoassay analysis instrument designed for frequent testing, which requires a rapid and easy technique for changing chips. The key components of the mechanism are refractive index matching gel coated on the rear of the SPR chip and a float that presses the chip down. The refractive index matching gel made it possible to optically couple the chip and the prism of the SPR instrument easily via elastic deformation with no air bubbles. The float has an autonomous attitude control function that keeps the chip parallel in relation to the SPR instrument by employing the repulsive force of permanent magnets between the float and a float guide located in the SPR instrument. This function is realized by balancing the upward elastic force of the gel and the downward force of the float, which experiences a leveling force from the float guide. This system makes it possible to start an SPR measurement immediately after chip installation and to remove the chip immediately after the measurement with a simple and easy method that does not require any fine adjustment. Our sensor chip, which we installed using this mounting system, successfully performed an immunoassay measurement on a model antigen (spiked human-IgG) in a model real sample (non-homogenized milk) that included many kinds of interfering foreign substances without any sample pre-treatment. The ease of the chip installation/removal operation and simple measurement procedure are suitable for frequent on-site agricultural, environmental and medical testing.

  5. Validation of a Tool for the Initial Dynamic Design of Mooring Systems for Large Floating Wave Energy Converters

    DEFF Research Database (Denmark)

    Thomsen, Jonas Bjerg; Ferri, Francesco; Kofoed, Jens Peter

    2017-01-01

    Mooring of floating wave energy converters is an important topic in renewable research since it highly influences the overall cost of the wave energy converter and thereby the cost of energy. In addition, several wave energy converter failures have been observed due to insufficient mooring system...

  6. FLOPAK: FLOATING POINT PROGRAMING PACKAGE,

    Science.gov (United States)

    FLOPAK is a Packard-Bell 250 Computer semi-automatic, floating - point programing system which may be operated simultaneously in either of two modes...250 floating - point system available which may be used in real-time control. The system was originally designed to solve a real-time communication problem....The first is a non-time optimized mode which may be used by inex perienced coders; the second mode is a high-speed, fully time-optimized floating

  7. Slim-structured electro-floating display system based on the polarization-controlled optical path.

    Science.gov (United States)

    Kim, Seung-Cheol; Park, Seong-Jin; Kim, Eun-Soo

    2016-04-18

    A new slim-type electro-floating display system based on the polarization-controlled optical path is proposed. In the proposed system, the optical path between the input plane and Fresnel lens can be made recursive by repetitive transmission and reflection of the input beam by employing a new polarization-based optical path controller (P-OPC), which is composed of two quaterwave plates, a half mirror and a reflective polarizer. Based on this P-OPC, the absolute optical path between the input plane and Fresnel lens, virtually representing the physical depth of the display system, can be reduced down to one third of its original path, which results in the same rate of decrease in the volume size of the display system. The operational principle of the proposed system is analyzed with the Jones matrix. In addition, to confirm the feasibility of the proposed system, experiments with test prototypes are carried out, and the results are comparatively discussed with those of the conventional system.

  8. [Purification of eutrophic wastewater by Cyperus alternifolius, Coleus blumei and Jasminum sambac planted in a floating phytoremediation system].

    Science.gov (United States)

    Liu, Shizhe; Lin, Dongjiao; Tang, Shujun; Luo, Jian

    2004-07-01

    In a greenhouse study, Cyperus alternifolius, Coleus blumei and Jasminum sambac were cultured in a floating phytoremediation system with plantation cups inserted into a polyfoam plate that floated in the upper part of a tank filled with 100 L domestic wastewater. The contents of chemical oxygen demand (CODCr), total P (T-P), total N (T-N), soluble P(S-P), ammonia-nitrogen (NH4+ -N) and nitrate-nitrogen (NO3- -N) in the domestic wastewater were tested during the growth of these three plants. The results showed that Cyperus alternifolius and Coleus blumei could grow well in the floating phytoremediation system, their dry weight being 285.8% and 371.4% of the initial weight of planting, respectively, but Jasminum sambac could not grow well, being 125.0% of the initial weight of planting. The removal rate of TN by these 3 plants was 68.0%, 62.0% and 45.0%, and that of NO3- -N, CODCr and TP was 98.0%, 80.0% and 92.0%, 78.0%, 66.0% and 55.0%, and 90.6%, 90.5% and 88.0% respectively. Cyperus alternifolius and Coleus blumei had good effects on the removal of pollutants in the floating phytoremediation system.

  9. Development of a floating point convolver (array processor) and integration into a computer system for the processing of seismic data

    Energy Technology Data Exchange (ETDEWEB)

    Meinicke, G.; Loeb, E.; M' Seddi, A.

    1979-11-01

    The development of a floating point convolver and its integration into a computer system for the processing of seismic data inevitably resulted in the development of an efficient Array Processor System (APS). The total project of a small efficient seismic processing system SSP-11 A with the host computer PDP 11/45 with integrated APS can be considered as a successful one. Seismic processes are carried out in floating point format by the APS and, thus, the basis for the Real Amplitude Processing is provided. Moreover, the efficiency of the system SSP-11 A, in the relation to SSP-11, can be doubled, with regard to the throughput of seismic data. Thus, in the new system SSP-11 A capacity for more sophisticated seismic programs is available. For decentralized operation the SSP-11 A is, as a minicomputer system, a real economical alternative to large computer systems. 7 figures.

  10. FLOAT Project

    DEFF Research Database (Denmark)

    Sørensen, Eigil V.; Aarup, Bendt

    The objective of the FLOAT project is to study the reliability of high-performance fibre-reinforced concrete, also known as Compact Reinforced Composite (CRC), for the floats of wave energy converters. In order to reach a commercial breakthrough, wave energy converters need to achieve a lower price...... of energy produced, comparable to prices currently obtained from offshore wind power, and this can be done by the use of more suitable materials. The flotation device is a key part of converters, as it accounts for a considerable share of initial investment, up to 27% depending on the converter. CRC floats...

  11. Development of novel gastroretentive floating particulate drug delivery system of gliclazide.

    Science.gov (United States)

    Awasthi, Rajendra; Kulkarni, Giriraj T

    2012-09-01

    The objective of present project was to improve the dissolution profile of gliclazide by developing floating alginate beads using various biodegradable polymers like gelatin, pectin and hydroxypropylmethylcellulose (HPMC). The floating beads were prepared by a simple ionotropic gelatin method using calcium carbonate as gas generating agent. The developed beads were characterized by Fourier transform infrared spectroscopy analysis, differential scanning calorimetry, X-ray diffraction analysis and scanning electron microscopy (SEM). The prepared beads showed good in vitro floatation, which was dependent on the concentration of gas-forming agent. SEM photomicrographs confirmed that the developed beads were spherical in shape and had particle size in the range of 730 to 890 μm. The incorporation efficiency was found to be in the range of 59.96 to 85.1%. The cumulative percent drug release from the beads after 10 h dissolution study at pH 1.2 and pH 5.8 was in the range of 33 to 46% and 82 to 95% respectively. The concentration of the gas generating agent was found to influence the release rate. The mechanism of drug release was Fickian diffusion with swelling. The in vivo sub-acute hypoglycemic study in high fat diet induced diabetic C57BL/6J mice demonstrated significant (p < 0.05) hypoglycemic effect over a period of 12 h and 24 h, respectively, with HPMC and pectin beads. A significant (p & 0.05) reduction in fasting and non-fasting blood glucose levels, reduction in fasting plasma insulin level and a significant improvement in glucose tolerance were observed in animals treated with formulations. The developed beads were suitable carriers for improving the systemic absorption of gliclazide and maintaining reduced blood glucose levels.

  12. Floating and bioadhesive delivery system of metoprolol succinate: Formulation, development and in vitro evaluation

    Directory of Open Access Journals (Sweden)

    Mohan Rathi

    2012-01-01

    Full Text Available Aim of this study was to develop gastroretentive sustained release floating and bioadhesive drug delivery system (FBDDS to prolong the gastric retention time of Metoprolol succinate. Tablets were prepared employing hydroxypropyl methylcellulose (HPMC K100M as hydrophilic gel material, sodium bicarbonate as gas-generating agent and Sodium CMC (SCMC as bioadhesive polymer. A 3 2 full factorial design and response surface methodology were used for designing of experiment, mapping change in responses and deriving optimum formulation. Selected independent variables were amounts HPMC K100M and SCMC polymer while floating lag time (FLT, bioadhesive strength, t 50 (time taken to release 50% of drug and t90 (time taken to release 90% of drug were selected as dependent variables. Investigation of functionality of individual polymer to predict effect on dependent variable were statistically analyzed using the RSM. Tablets were also evaluated for physical properties, swelling and matrix erosion. Increase in concentration of HPMC and decrease in concentration of SCMC resulted in retardation of drug release. Furthermore, combination of HPMC K100M and sodium bicarbonate along with SCMC was found to affect buoyancy, bioadhesion strength and drug release. Optimized formulation showed values of dependent variables close to predicted values. Optimized formulation follows Higuchi kinetics with short buoyancy lag time, total buoyancy time of more than 24 hours and could maintain drug release for 24 hours. Content uniformity, hardness, friability, weight variation were all lying within limits. Hence, FBDDS was found to be very promising and alternative approach to increase gastric retention of dosage form and may improve bioavailability.

  13. Design and gamma-scintigraphic evaluation of a floating and pulsatile drug delivery system based on an impermeable cylinder.

    Science.gov (United States)

    Zou, Hao; Jiang, Xuetao; Kong, Lingshan; Gao, Shen

    2007-04-01

    A blend of floating and pulsatile principles of drug delivery system seems to present the advantage that a drug can be released in the upper GI tract after a definite time period of no drug release. The objective of this study was to develop and evaluate a floating and pulsatile drug delivery system based on an impermeable cylinder. Pulsatile capsule was prepared by sealing the drug tablet and the buoyant material filler inside the impermeable capsule body with erodible plug. The drug delivery system showed typical floating and pulsatile release profile with a lag time followed by a rapid release phase. The lag time prior to the pulsatile drug release correlated well with the erosion properties of plugs and the composition of the plug could be controlled by the weight of the plug. The buoyancy of the whole system depended on the bulk density of the dosage form. Gamma-scintigraphic evaluation in humans was used to establish methodology capable of showing the subsequent in vivo performance of the floating and pulsatile release capsule. Developed formulations showed instantaneous floating with no drug release during the lag time followed by a pulse drug release. From the gamma-scintigraphic results, the pulsatile release capsule we prepared could achieve a rapid release after lag time in vivo, which was longer than that in vitro. The scintigraphic evaluation could confirm qualitatively that the system with in vitro lag time of 4.0 h provided, with relatively high reproducibility, a pulsatile release occurred around 5.0 h after administration.

  14. REVIEW ON FLOATING DRUG DELIVERY SYSTEMS: AN APPROACH TO ORAL CONTROLLED DRUG DELIVERY VIA GASTRIC RETENTION

    Directory of Open Access Journals (Sweden)

    Kadam Shashikant M

    2011-06-01

    Full Text Available Controlled release (CR dosage forms have been extensively used to improve therapy with many important drugs. Several approaches are currently utilized in prolongation of gastric residence time, including floating drug delivery system, swelling and expanding system, polymeric bioadhesive system, modified shape system, high density system and other delayed gastric emptying devices. However, the development processes are faced with several physiological difficulties such as the inability to restrain and localize the system within the desired region of the gastrointestinal tract and the highly variable nature of the gastric emptying process. On the other hand, incorporation of the drug in a controlled release gastroretentive dosage forms (CR-GRDF which can remain in the gastric region for several hours would significantly prolong the gastric residence time of drugs and improve bioavailability, reduce drug waste, and enhance the solubility of drugs that are less soluble in high pH environment. Gastroretention would also facilitate local drug delivery to the stomach and proximal small intestine. Thus, gastroretention could help to provide greater availability of new products and consequently improved therapeutic activity and substantial benefits to patients. The purpose of this paper is to review the recent literature and current technology used in the development of gastroretentive dosage forms.

  15. Chaotic and Subharmonic Motion Analysis of Floating Ring Gas Bearing System by Hybrid Numerical Method

    Directory of Open Access Journals (Sweden)

    Cheng-Chi Wang

    2013-01-01

    Full Text Available This paper studies the nonlinear dynamic behaviors including chaotic, subharmonic, and quasi-periodic motions of a rigid rotor supported by floating ring gas bearing (FRGB system. A hybrid numerical method combining the differential transformation method and the finite difference method used to calculate pressure distribution of FRGB system and rotor orbits. The results obtained for the orbits of the rotor center are in good agreement with those obtained using the traditional finite difference approach. Moreover, the hybrid method avoids the numerical instability problem suffered by the finite difference scheme at low values of the rotor mass and computational time-step. Moreover, power spectra, Poincaré maps, bifurcation diagrams and Lyapunov exponents are applied to examine the nonlinear dynamic response of the FRGB system over representative ranges of the rotor mass and bearing number, respectively. The results presented summarize the changes which take place in the dynamic behavior of the FRGB system as the rotor mass and bearing number are increased and therefore provide a useful guideline for the bearing system.

  16. Numerical modelling of wave energy absorption by a floating point absorber system

    Energy Technology Data Exchange (ETDEWEB)

    Backer, G. De; Banasiak, R.; Beels, C. [Ghent University Civil Engineering Department, Zwijnaarde (Belgium); J. De Rouck, J. De

    2007-07-01

    Point absorbers are wave energy converters (WECs) consisting of small (floating) bodies oscillating with either one or more degrees of freedom. They can either move with respect to a fixed reference, or with respect to a floating reference. Different buoy geometries are evaluated to obtain the ideal values of size, shape and draft with regard to power absorption for a given moderate wave climate. In this paper, the performance of a heaving point absorber in a floating platform is analysed in a linear way.

  17. The quantitative analysis of instantaneous floating-point amplifier in DFS-V seismic system

    Energy Technology Data Exchange (ETDEWEB)

    Xianiu, H.; Wenze, Y.; Yanyun, D.; Qi, F.

    1988-01-01

    On the basis of analysing the principle and circuit of instantaneous floating-point amplifier (IFP amplifier) in DFS-V seismic system, the authors developed a set of mathematic models for quantitative analysis of IFP amplifier, and designed the program for computing and plotting. The amplitude characteristic curves were computed and plotted on DUAL-6800 microcomputer by making use of the original parameters of DFS-V seismic system. The computation result shows that this system can effectively restrain the overflow distortion caused by zero-passage dipping-top sample to make high fidelity transmission of seismic signals, but its measurement accuracy is on the low side. In order to overcome the demerit, the authors changed the original parameters of IFP amplifier circuit and made a great deal of sweep computation, so that they found these ideal new parameters: prediction time(c) = 3..mu..s, upper reference level(V) = 6.8V and 7.2V, lower reference level(V) = 1.6V and 1.7V. As a result, no overflow distortion occurs, furthermore IFP amplifier shows much higher measurement accuracy than before, these favour the ameliorating of seismic signals.

  18. Pharmacokinetic study of repaglinide floating drug delivery system in rabbits by RP-HPLC method

    Institute of Scientific and Technical Information of China (English)

    T. Ramanj ireddy; D. Dhachinamoorthi; K.B. Chandrasekhar

    2012-01-01

    The present work is aimed to study the pharmacokinetic parameters of optimized repaglinide floating drug delivery system (FDDS) by 24 factorial designs,followed by comparison with a commercially available formulation.The main effects and interactions of formulation variables were studied by using normal and pareto charts.The optimized formulation shows a fickian diffusion drug release mechanism.Pharmacokinetic parameters of the designed drug delivery system were evaluated in rabbit models.Mean while a simple,specific high performance liquid chromatographic method was developed and validated as per biopharmaceutical specifications,the linearity was observed at the range of 110-550 ng/mL (r2 =0.999).By using methanol-phosphate buffer (pH 2.5) (70∶30,v/v) as mobile phase at the flow rate of 1.0 mL/min the validation shows a better retention time of 5.2 min for repaglinide.And the same validation method was used for pharmacokinetic profile analysis of repaglinide marketed products and FDDS.The comparative pharmacokinetic results such as tmax,half-life,area under the curve,mean residence times were increased significantly for the repaglinide in FDDS than the marketed product of repaglinide except Cmax and elimination rate constant.

  19. Experimental Investigation of Convective Heat Transfer during Night Cooling with Different Ventilation Systems and Surface Emissivities

    DEFF Research Database (Denmark)

    Le Dreau, Jerome; Heiselberg, Per; Jensen, Rasmus Lund

    2013-01-01

    Night-time ventilation is a promising approach to reduce the energy needed for cooling buildings without reducing thermal comfort. Nevertheless actual building simulation tools have showed their limits in predicting accurately the efficiency of night-time ventilation, mainly due to inappropriate...... air and the room, and floor emissivities. This extensive experimental study enabled a detailed analysis of the convective and radiative flow at the different surfaces of the room. The experimentally derived convective heat transfer coefficients (CHTC) have been compared to existing correlations...... ventilation, the convective heat transfer was well predicted by existing correlations. Nevertheless the change of floor emissivity influenced the CHTC at the surface of interest....

  20. Cantronic Systems Takes Active Night Vision to the Next Level By Breaking 800m (2600 ft) Mark in Total Darkness and Demanding Weather Conditions

    Institute of Scientific and Technical Information of China (English)

    2005-01-01

    Capturing clear images in total darkness from up to 800m (2600 ft) away in demanding weather conditions and total darkness isnow possible with Cantronic Systems' CIRPS00m Active Infrared Night Vision System. Cantronic Systems, Inc.

  1. Floating Life

    Institute of Scientific and Technical Information of China (English)

    YIN PUMIN

    2010-01-01

    @@ One in six people in China have left their hometown in search of a better life and the number continues to grow,creating a challenge for host cities,according to a government report.The floating population,or people who live and work outside their permanent home,reached 211 million last year and the number could reach 350 million by 2050 if govemment policies remain unchanged,said the Report on the Development of China's Floating Population issued on June 26 by the National Population and Family Planning Commission (NPFPC).

  2. Summary of Conclusions and Recommendations Drawn from the DeepCWind Scaled Floating Offshore Wind System Test Campaign: Preprint

    Energy Technology Data Exchange (ETDEWEB)

    Robertson, A. N.; Jonkman, J. M.; Masciola, M. D.; Molta, P.; Goupee, A. J.; Coulling, A. J.; Prowell, I.; Browning, J.

    2013-07-01

    The DeepCwind consortium is a group of universities, national labs, and companies funded under a research initiative by the U.S. Department of Energy (DOE) to support the research and development of floating offshore wind power. The two main objectives of the project are to better understand the complex dynamic behavior of floating offshore wind systems and to create experimental data for use in validating the tools used in modeling these systems. In support of these objectives, the DeepCwind consortium conducted a model test campaign in 2011 of three generic floating wind systems, a tension-leg platform (TLP), a spar-buoy (spar), and a semisubmersible (semi). Each of the three platforms was designed to support a 1/50th-scale model of a 5 MW wind turbine and was tested under a variety of wind/wave conditions. The focus of this paper is to summarize the work done by consortium members in analyzing the data obtained from the test campaign and its use for validating the offshore wind modeling tool, FAST.

  3. Simulations and Measurements of Human Middle Ear Vibrations Using Multi-Body Systems and Laser-Doppler Vibrometry with the Floating Mass Transducer

    OpenAIRE

    Tobias Strenger; Stefan Lehner; Frank Böhnke; Theodor Bretan

    2013-01-01

    The transfer characteristic of the human middle ear with an applied middle ear implant (floating mass transducer) is examined computationally with a Multi-body System approach and compared with experimental results. For this purpose, the geometry of the middle ear was reconstructed from μ-computer tomography slice data and prepared for a Multi-body System simulation. The transfer function of the floating mass transducer, which is the ratio of the input voltage and the generated force, is deri...

  4. A comparison of floating point and logarithmic number systems for FPGAs.

    Energy Technology Data Exchange (ETDEWEB)

    Hauck, Scott (University of Washington, Seattle, WA); Wood, Aaron (University of Washington, Seattle, WA); Beauchamp, Michael (University of Washington, Seattle, WA); Haselman, Michael (University of Washington, Seattle, WA); Hemmert, K. Scott; Underwood, Keith Douglas

    2005-02-01

    There have been many papers proposing the use of logarithmic numbers (LNS) as an alternative to floating point because of simpler multiplication, division and exponentiation computations. However, this advantage comes at the cost of complicated, inexact addition and subtraction, as well as the need to convert between the formats. In this work, we created a parameterized LNS library of computational units and compared them to an existing floating point library. Specifically, we considered multiplication, division, addition, subtraction, and format conversion to determine when one format should be used over the other and when it is advantageous to change formats during a calculation.

  5. Comparative Visual Performance with ANVIS (Aviator’s Night Vision Imaging System) and AN/PVS-5A Night Vision Goggles under Starlight Conditions

    Science.gov (United States)

    1984-08-01

    USAFSAM/TSK-4 (STINFO). WARNING INFORMATION SUBJECT TO EXPORT CONTROL LAWS This document may contain information subject to the Intern4liona! Traffic ...on, jNight vision goggles, ANVIS, AN/PVS-5A, Snellen visual acuity, - 17 asdepth perception, stereopsis 1.ABSTRACT iCaaeeoose im ieree of poeeaeuar...2) stereopsis (depth perception), and 3) a subjective forced choice test. Results showed thnit BVA was 20/124 and 20/36 for the Il and III GEN NVG

  6. Comparing the costs and benefits of floating rice-based and intensive rice-based farming systems in the Mekong delta

    Directory of Open Access Journals (Sweden)

    Van Kien Nguyen

    2015-09-01

    Full Text Available This paper compares financial costs and benefits of floating rice-based and intensive rice farming systems using data from focus group discussions and household survey in four locations in the Mekong Delta. We argue that the net financial benefit per 1000m2 of integrated floating rice-based farming systems is greater than the net financial benefit of intensive rice farming system. The total net benefit of floating rice-leeks shows the highest net benefit (VND 24.8 mil./1000 m2, followed by floating rice-sweet corn- two baby corn crops and cattle systems (VND 18.5 mil./1000m2, and floating rice-chili (VND 16.7-17.7 mil./1000m2. If farmers cultivate monoculture of rice either two or three crops, the net benefits are ranging from VND 2.2-4.8 mil./1000m2 respectively. Alternatively, farmers integrate vegetables; the net benefit was ranging from VND 5.6 to 11.7 mil./1000m2. The net benefit of the two rice crops is lowest (VND 1.3-2.3 mil./1000m2. Surprisingly, if farmers convert from two intensive rice crops to two maize crops, the net benefit can reach to VND 21 million/1000m2. The results support the argument that the floating rice based systems allows farmers diversified into profitable upland crops, which can help farmers to improve their total income.

  7. A pilot-scale floating closed culture system for the multicellular cyanobacterium Arthrospira platensis NIES-39.

    Science.gov (United States)

    Toyoshima, Masakazu; Aikawa, Shimpei; Yamagishi, Takahiro; Kondo, Akihiko; Kawai, Hiroshi

    Microalgae are considered to be efficient bio-resources for biofuels and bio-based chemicals because they generally have high productivity. The filamentous cyanobacterium Arthrospira (Spirulina) platensis has been widely used for food, feed, and nutrient supplements and is usually cultivated in open ponds. In order to extend the surface area for growing this alga, we designed a pilot-scale floating closed culture system for cultivating A. platensis on open water and compared the growth and quality of the alga harvested at both subtropical and temperate regions. The biomass productivity of A. platensis NIES-39 was ca. 9 g dry biomass m(-2) day(-1) in summer at Awaji Island (warm temperature region) and ca. 10 and 6 g dry biomass m(-2) day(-1) in autumn and winter, respectively, at Ishigaki Island, (subtropical region) in Japan. If seawater can be used for culture media, culture cost can be reduced; therefore, we examined the influence of seawater salt concentrations on the growth of A. platensis NIES-39. Growth rates of A. platensis NIES-39 in diluted seawater with enrichment of 2.5 g L(-1) NaNO3, 0.01 g L(-1) FeSO4·7H2O, and 0.08 g L(-1) Na2EDTA were considerably lower than SOT medium, but the biomass productivity (dry weight) was comparable to SOT medium. This is explained by the heavier cell weight of the alga grown in modified seawater media compared to the alga grown in SOT medium. Furthermore, A. platensis grown in modified seawater-based medium exhibited self-flocculation and had more loosely coiled trichomes.

  8. FORMULATION AND IN VITRO EVALUATION OF GLIPIZIDE AS FLOATING DRUG DELIVERY SYSTEM WITH NATURAL POLYMER (GUAR-GUM

    Directory of Open Access Journals (Sweden)

    Singh Amit Kumar

    2012-08-01

    Full Text Available The purpose of this investigation was to prepare a gastro retentive drug delivery system of Glipizide. Floating tablets of Glipizide were prepared employing different polymers like HPMC K15M, Guar-Gum, Carbopol 934p and Magnesium Stearate by effervescent technique. Sodium bicarbonate and citric acid were incorporated as a gas generating agent. The Floating tablets were evaluated for uniformity of weight, hardness, friability, drug content, in- vitro buoyancy, swelling study, dissolution studies and stability studies. The drug release profile and floating properties was investigated. The prepared tablets exhibited satisfactory physico-chemical characteristics. All the prepared batches showed good in vitro buoyancy. It was aimed to prepare for prolonged residence in the stomach over conventional Gastroretentive approaches. The tablets are produced by direct compression method. The release of the drug is concern from the nine formulations. F5 is a best formulation to determine the mode of release the data was subjected to Zero Order model. F5 optimized formulation released approximately 98.15% drug in 12 hours in vitro.

  9. Nutrient removal of a floating plant system receiving low- pollution wastewater: Effects of plant species and influent concentration

    Science.gov (United States)

    Duan, J. J.; Zhao, J. N.; Xue, L. H.; Yang, L. Z.

    2016-08-01

    Plant floating bed was adopted in this study to compare the purification effect of four plant species (Oenanthe javanica, Ipomoea aquatica, Hydrocotyle vulgaris, and Iris sibirica) receiving high and low treated domestic sewage. The experiment was conducted for eight months during the low temperature season. The results indicated that the average removal rates of TN and NH4+-N in I. aquatica floating bed were relatively high both under high and low influent concentration during the first stage of the experiment. During the second stage, H. vulgaris showed the best performance for nitrogen treatment, and the average removal rates of TN were 70.7% and 87.7% under high and low influent concentration, while the average removal rates of NH4 +-N were as high as 98.9% and 98.9%, accordingly. Moreover, H. vulgaris contributed most for plant assimilation to nitrogen removal among different plant floating systems. It was also found that the existence of hydrophytes effectively controlled the rise of water pH value and algae growth and reproduction, which helped to improve the aquatic environment. The results provide engineering parameters for the future design of an ecological remediation technology for low-pollution wastewater purification.

  10. Behavior of Flotsam in the California Current System Utilizing Surface Drift of RAFOS Floats

    Science.gov (United States)

    2012-09-01

    Timothy L. Campbell, Paul J. Martin, Pamela G. Posey, and Robert C. Rhodes of NRL and model output was made available to us by Ms. Lucy F. Smedstad of...used to adjust the angle an object travels in relation to the wind. Ekman theory predicts that objects floating on the ocean surface flow at an

  11. Study on Floating Properties and Stability of Air Floated Structures

    Institute of Scientific and Technical Information of China (English)

    别社安; 及春宁; 任增金; 李增志

    2002-01-01

    In this paper, the buoyancy, kinetic properties and stability of air floated structures have been studied by theoreticaland experimental methods. The equations for calculation of the buoyancy of the air floated buoy are derived according tothe Boyler law and the equilibrium equations of the air floated structure are established. Through simplification of the airfloated structure as a single freedom rigid body and spring system, the natural period of heaving and some kinetic proper-ties are discussed. In the stability analysis, the formulas for calculation of the meta centric height are presented. The the-oretical results are in good agreement with the data observed from the model test and prototype test. The air buoyancy de-crease coefficient presented in this paper has a large influence on the floating state, stability and dynamic properties of theair floated structure. The stability of the air floated structure can also be judged by the parameter of meta centric height,and calculations show that the air floated structure is less stable than the conventional float.

  12. Evaluation of Biomass Yield and Water Treatment in Two Aquaponic Systems Using the Dynamic Root Floating Technique (DRF)

    OpenAIRE

    Laura Silva; Eucario Gasca-Leyva; Edgardo Escalante; Kevin M Fitzsimmons; David Valdés Lozano

    2015-01-01

    The experiment evaluates the food production and water treatment of TAN, NO2−–N, NO3−–N, and PO43− in two aquaponics systems using the dynamic root floating technique (DRF). A separate recirculation aquaculture system (RAS) was used as a control. The fish cultured was Nile tilapia (Oreochromis niloticus). The hydroponic culture in one treatment (PAK) was pak choy (Brassica chinensis,) and in the other (COR) coriander (Coriandrum sativum). Initial and final weights were determined for the fis...

  13. Comparing the Floating Point Systems, Inc. AP-190L to representative scientific computers: some benchmark results

    Energy Technology Data Exchange (ETDEWEB)

    Brengle, T.A.; Maron, N.

    1980-03-27

    Results are presented of comparative timing tests made by running a typical FORTRAN physics simulation code on the following machines: DEC PDP-10 with KI processor; DEC PDP-10, KI processor, and FPS AP-190L; CDC 7600; and CRAY-1. Factors such as DMA overhead, code size for the AP-190L, and the relative utilization of floating point functional units for the different machines are discussed. 1 table.

  14. Two separate molecular systems, Dachsous/Fat and Starry night/Frizzled, act independently to confer planar cell polarity.

    Science.gov (United States)

    Casal, José; Lawrence, Peter A; Struhl, Gary

    2006-11-01

    Planar polarity is a fundamental property of epithelia in animals and plants. In Drosophila it depends on at least two sets of genes: one set, the Ds system, encodes the cadherins Dachsous (Ds) and Fat (Ft), as well as the Golgi protein Four-jointed. The other set, the Stan system, encodes Starry night (Stan or Flamingo) and Frizzled. The prevailing view is that the Ds system acts via the Stan system to orient cells. However, using the Drosophila abdomen, we find instead that the two systems operate independently: each confers and propagates polarity, and can do so in the absence of the other. We ask how the Ds system acts; we find that either Ds or Ft is required in cells that send information and we show that both Ds and Ft are required in the responding cells. We consider how polarity may be propagated by Ds-Ft heterodimers acting as bridges between cells.

  15. Floating shoulder

    OpenAIRE

    B. de Pablo Márquez; P. Castillón Bernal; I. Fuentes López

    2014-01-01

    La fractura concomitante de clavícula y escápula es una entidad poco frecuente que puede ser una de las causas de afectación del complejo suspensorio del hombro también denominado hombro flotante (floating shoulder). Se relaciona frecuentemente con traumatismos de alta energía. Presentamos un caso de esta patología en un paciente varón de 28 años que consultó por caída en bicicleta con contusión sobre hombro izquierdo. Se describen las diferentes opciones terapéuticas planteadas, las imágenes...

  16. Analysis of the Potential for Use of Floating Photovoltaic Systems on Mine Pit Lakes: Case Study at the Ssangyong Open-Pit Limestone Mine in Korea

    Directory of Open Access Journals (Sweden)

    Jinyoung Song

    2016-02-01

    Full Text Available Recently, the mining industry has introduced renewable energy technologies to resolve power supply problems at mines operating in polar regions or other remote areas, and to foster substitute industries, able to benefit from abandoned sites of exhausted mines. However, little attention has been paid to the potential placement of floating photovoltaic (PV systems operated on mine pit lakes because it was assumed that the topographic characteristics of open-pit mines are unsuitable for installing any type of PV systems. This study analyzed the potential of floating PV systems on a mine pit lake in Korea to break this misconception. Using a fish-eye lens camera and digital elevation models, a shading analysis was performed to identify the area suitable for installing a floating PV system. The layout of the floating PV system was designed in consideration of the optimal tilt angle and array spacing of the PV panels. The System Advisor Model (SAM by National Renewable Energy Laboratory, USA, was used to conduct energy simulations based on weather data and the system design. The results indicated that the proposed PV system could generate 971.57 MWh/year. The economic analysis (accounting for discount rate and a 20-year operational lifetime showed that the net present value would be $897,000 USD, and a payback period of about 12.3 years. Therefore, we could know that the economic effect of the floating PV system on the mine pit lake is relatively higher than that of PV systems in the other abandoned mines in Korea. The annual reduction of greenhouse gas emissions was analyzed and found to be 471.21 tCO2/year, which is twice the reduction effect achieved by forest restoration of an abandoned mine site. The economic feasibility of a floating PV system on a pit lake of an abandoned mine was thus established, and may be considered an efficient reuse option for abandoned mines.

  17. Pollination of Campomanesia phaea (Myrtaceae) by night-active bees: a new nocturnal pollination system mediated by floral scent.

    Science.gov (United States)

    Cordeiro, G D; Pinheiro, M; Dötterl, S; Alves-Dos-Santos, I

    2017-03-01

    Bees are the most important diurnal pollinators of angiosperms. In several groups of bees a nocturnal/crepuscular habit developed, yet little is known about their role in pollination and whether some plants are adapted specifically to these bees. We used a multidisciplinary approach to investigate the reproductive biology and to understand the role of nocturnal/crepuscular bees in pollination of Campomanesia phaea (Myrtaceae), popularly named cambuci. We studied the floral biology and breeding system of C. phaea. We collected the floral visitors and tested the pollinators' effectiveness. We also determined the floral scents released at night and during daytime, and studied behavioural responses of crepuscular/nocturnal bees towards these scents. The flowers of cambuci were self-incompatible and had pollen as the only resource for flower visitors. Anthesis lasted around 14 h, beginning at 04:30 h at night. The flowers released 14 volatile compounds, mainly aliphatic and aromatic compounds. We collected 52 species of floral visitors, mainly bees. Nocturnal and crepuscular bees (four species) were among the most frequent species and the only effective pollinators. In field bioassays performed at night, nocturnal/crepuscular bees were attracted by a synthetic scent blend consisting of the six most abundant compounds. This study describes the first scent-mediated pollination system between a plant and its nocturnal bee pollinators. Further, C. phaea has several floral traits that do not allow classification into other nocturnal pollination syndromes (e.g. pollinator attraction already before sunrise, with pollen as the only reward), instead it is a plant specifically adapted to nocturnal bees. © 2016 German Botanical Society and The Royal Botanical Society of the Netherlands.

  18. Serial floating point formatter

    Energy Technology Data Exchange (ETDEWEB)

    Peterson, R. D.; Penner, W. A.

    1985-11-12

    A floating point formatter for changing fixed point serial digital data, such as that received by a seismic data acquisition system, is disclosed wherein fixed point serial digital data is received and scaled to remove any bias added by preamplification. The scaled data is shifted a predetermined number of bits and a resulting exponent is calculated. The shifted data signal and corresponding exponent are combined and further scaled to permit stacking the data without exceeding the system capacity.

  19. Emergency/Night Lightning

    Science.gov (United States)

    1980-01-01

    UDEC's highly efficient lighting system is finding wide acceptance among industrial and commercial firms as an energy savings means of providing emergency and night lighting. Originating from Skylab, the system consists of small high frequency fluorescent light fixtures powered by solar cells. Advantages of UDEC's lighting system stem from high reliability and high light output with very low energy drain. Principal components of system are long life fluorescent lamps operated by electronic circuitry, a sealed gelatine cell battery that needs no maintenance for eight years and a solid-state automatic battery charger. Installation of UDEC lighting in a company's six-and-a-half acre warehouse office cut the annual night lighting electric bill from $8,000 a year to $300 per year.

  20. Characteristic of Starch-Poly(N-Vinyl-Pyrrolidone) for an encapsulation material in floating drug delivery system

    Science.gov (United States)

    Rositaningsih, N.; Budianto, E.

    2017-04-01

    semi-IPN-starch, crosslinked-starch, and non-modified starch. From all characterizations done in this research, it can be suggested that the full-IPN provided the most suitable characteristics as an encapsulation material candidate in a floating drug delivery system.

  1. Using a Floating-Gate MOS Transistor as a Transducer in a MEMS Gas Sensing System

    Science.gov (United States)

    Barranca, Mario Alfredo Reyes; Mendoza-Acevedo, Salvador; Flores-Nava, Luis M.; Avila-García, Alejandro; Vazquez-Acosta, E. N.; Moreno-Cadenas, José Antonio; Casados-Cruz, Gaspar

    2010-01-01

    Floating-gate MOS transistors have been widely used in diverse analog and digital applications. One of these is as a charge sensitive device in sensors for pH measurement in solutions or using gates with metals like Pd or Pt for hydrogen sensing. Efforts are being made to monolithically integrate sensors together with controlling and signal processing electronics using standard technologies. This can be achieved with the demonstrated compatibility between available CMOS technology and MEMS technology. In this paper an in-depth analysis is done regarding the reliability of floating-gate MOS transistors when charge produced by a chemical reaction between metallic oxide thin films with either reducing or oxidizing gases is present. These chemical reactions need temperatures around 200 °C or higher to take place, so thermal insulation of the sensing area must be assured for appropriate operation of the electronics at room temperature. The operation principle of the proposal here presented is confirmed by connecting the gate of a conventional MOS transistor in series with a Fe2O3 layer. It is shown that an electrochemical potential is present on the ferrite layer when reacting with propane. PMID:22163478

  2. Using a floating-gate MOS transistor as a transducer in a MEMS gas sensing system.

    Science.gov (United States)

    Barranca, Mario Alfredo Reyes; Mendoza-Acevedo, Salvador; Flores-Nava, Luis M; Avila-García, Alejandro; Vazquez-Acosta, E N; Moreno-Cadenas, José Antonio; Casados-Cruz, Gaspar

    2010-01-01

    Floating-gate MOS transistors have been widely used in diverse analog and digital applications. One of these is as a charge sensitive device in sensors for pH measurement in solutions or using gates with metals like Pd or Pt for hydrogen sensing. Efforts are being made to monolithically integrate sensors together with controlling and signal processing electronics using standard technologies. This can be achieved with the demonstrated compatibility between available CMOS technology and MEMS technology. In this paper an in-depth analysis is done regarding the reliability of floating-gate MOS transistors when charge produced by a chemical reaction between metallic oxide thin films with either reducing or oxidizing gases is present. These chemical reactions need temperatures around 200 °C or higher to take place, so thermal insulation of the sensing area must be assured for appropriate operation of the electronics at room temperature. The operation principle of the proposal here presented is confirmed by connecting the gate of a conventional MOS transistor in series with a Fe(2)O(3) layer. It is shown that an electrochemical potential is present on the ferrite layer when reacting with propane.

  3. Using a Floating-Gate MOS Transistor as a Transducer in a MEMS Gas Sensing System

    Directory of Open Access Journals (Sweden)

    Gaspar Casados-Cruz

    2010-11-01

    Full Text Available Floating-gate MOS transistors have been widely used in diverse analog and digital applications. One of these is as a charge sensitive device in sensors for pH measurement in solutions or using gates with metals like Pd or Pt for hydrogen sensing. Efforts are being made to monolithically integrate sensors together with controlling and signal processing electronics using standard technologies. This can be achieved with the demonstrated compatibility between available CMOS technology and MEMS technology. In this paper an in-depth analysis is done regarding the reliability of floating-gate MOS transistors when charge produced by a chemical reaction between metallic oxide thin films with either reducing or oxidizing gases is present. These chemical reactions need temperatures around 200 °C or higher to take place, so thermal insulation of the sensing area must be assured for appropriate operation of the electronics at room temperature. The operation principle of the proposal here presented is confirmed by connecting the gate of a conventional MOS transistor in series with a Fe2O3 layer. It is shown that an electrochemical potential is present on the ferrite layer when reacting with propane.

  4. Night Terrors (For Parents)

    Science.gov (United States)

    ... Kids to Be Smart About Social Media Night Terrors KidsHealth > For Parents > Night Terrors Print A A A en español Terrores nocturnos What Are Night Terrors? Most parents have comforted their child after the ...

  5. LHCb: The nightly build and test system for LCG AA and LHCb software

    CERN Multimedia

    Kruzelecki, K; Degaudenzi, H

    2009-01-01

    The core software stack both from the LCG Application Area and LHCb consists of more than 25 C++/Fortran/Python projects build for about 20 different configurations on Linux, Windows and MacOSX. To these projects, one can also add about 20 external software packages (Boost, Python, Qt, CLHEP, ...) which have also to be build for the same configurations. It order to reduce the time of the development cycle and increase the quality insurance, a framework has been developed for the daily (nightly actually) build and test of the software. Performing the build and the tests on several configurations and platform allows to increase the efficiency of the unit and integration tests. Main features: - flexible and fine grained setup (full, partial build) through a web interface - possibility to build several "slots" with different configurations - precise and highly granular reports on a web server - support for CMT projects (but not only) with their cross-dependencies. - scalable client -server architecture for the co...

  6. Floating shoulder

    Directory of Open Access Journals (Sweden)

    B. de Pablo Márquez

    2014-09-01

    Full Text Available La fractura concomitante de clavícula y escápula es una entidad poco frecuente que puede ser una de las causas de afectación del complejo suspensorio del hombro también denominado hombro flotante (floating shoulder. Se relaciona frecuentemente con traumatismos de alta energía. Presentamos un caso de esta patología en un paciente varón de 28 años que consultó por caída en bicicleta con contusión sobre hombro izquierdo. Se describen las diferentes opciones terapéuticas planteadas, las imágenes radiológicas y una revisión de la literatura.

  7. A novel gastro-floating multiparticulate system for dipyridamole (DIP) based on a porous and low-density matrix core: in vitro and in vivo evaluation.

    Science.gov (United States)

    Li, Zhao; Xu, Heming; Li, Shujuan; Li, Qijun; Zhang, Wenji; Ye, Tiantian; Yang, Xinggang; Pan, Weisan

    2014-01-30

    The study was aimed to develop a novel gastro-floating multiparticulate system based on a porous and low-density matrix core with excellent floatability. The gastro-floating pellets (GFP) were composed of a porous matrix core, a drug loaded layer (DIP and HPMC), a sub-coating layer (HPMC) and a retarding layer (Eudragit(®) NE 30D). The porous matrix cores were evaluated in specific. EC was chosen as the matrix membrane for its rigidity and minimal expansion to large extent. The porous matrix core was achieved by the complete release of the bulk water soluble excipient from the EC coated beads, and mannitol was selected as the optimal water soluble excipient. SEM photomicrographs confirmed the structure of porous matrix cores. The compositions of GFP were investigated and optimized by orthogonal array design. The optimized formulation could sustain the drug release for 12h and float on the dissolution medium for at least 12h without lag time to float. The pharmacokinetic study was conducted in beagle dogs, and the relative bioavailability of the test preparation was 193.11±3.43%. In conclusion, the novel gastro-floating pellets can be developed as a promising approach for the gastro-retentive drug delivery systems.

  8. Bretton Woods Fixed Exchange Rate System versus Floating Exchange Rate System

    OpenAIRE

    Geza, Paula; Giurca Vasilescu, Laura

    2011-01-01

    One of the most important issues of monetary policy is to find out whether the state should intervene among the exchange rates, taking into account the fact that changes in the exchange rates represent a significant transmission channel of the effects generated by the monetary policy. Taking into consideration the failure of fixed exchange rate regimes and the recent improvement of financial markets, the return in the near future to such a regime – as for example the Bretton Woods system –...

  9. [Treatment effect of biological filtration and vegetable floating-bed combined system on greenhouse turtle breeding wastewater].

    Science.gov (United States)

    Chen, Chong-Jun; Zhang, Rui; Xiang, Kun; Wu, Wei-Xiang

    2014-08-01

    Unorganized discharge of greenhouse turtle breeding wastewater has brought several negative influences on the ecological environment in the rural area of Yangtze River Delta. Biological filtration and vegetable floating-bed combined system is a potential ecological method for greenhouse turtle breeding wastewater treatment. In order to explore the feasibility of this system and evaluate the contribution of vegetable uptake of nitrogen (N) and phosphorus (P) in treating greenhouse turtle breeding wastewater, three types of vegetables, including Ipomoea aquatica, lettuce and celery were selected in this study. Results showed the combined system had a high capacity in simultaneous removal of organic matter, N and P. The removal efficiencies of COD, NH4(+)-N, TN and TP from the wastewater reached up to 93.2%-95.6%, 97.2%-99.6%, 73.9%-93.1% and 74.9%-90.0%, respectively. System with I. aquatica had the highest efficiencies in N and P removal, followed by lettuce and celery. However, plant uptake was not the primary pathway for TN arid TP removal in the combined system. The vegetable uptake of N and P accounted for only 9.1%-25.0% of TN and TP removal from the wastewater while the effect of microorganisms would be dominant for N and P removal. In addition, the highest amounts of N and P uptake in I. aquatica were closely related with the biomass of plant. Results from the study indicated that the biological filtration and vegetable floating-bed combined system was an effective approach to treating greenhouse turtle breeding wastewater in China.

  10. [Night workers and plasmatic cortisol].

    Science.gov (United States)

    Palermo, P; Rosati, M V; Ciarrocca, M; Nicassio, P; Piccoli, F; Cerratti, D; Anzani, M F; Tomei, G; Perugi, F; Monti, C; Palitti, T; Tomao, E; Caciari, T; Tomei, F

    2007-01-01

    The aim of the study is to evaluate whether occupational exposure to night work could cause alterations in the levels of plasmatic cortisol. The interest toward this argument arises form several studies in scientific literature referring the presence of an alteration in the synthesis and release of cortisol in workers exposed to night work. We studied a population of workers employed in night security service and monitoring service of alarm systems in different museums compared to a control group not performing shift-work and/or night work. The exposed and control subjects were compared by age, length of service, smoking habit (n. cigarettes per day), habitual consumption of alcoholic drinks (n. glass of wine/beer per day). We evaluated the levels of plasmatic cortisol on 50 workers exposed to night work, all males of whom 30 smokers and 20 non-smokers and on 50 controls of whom 30 smokers and 20 non-smokers.

  11. Floating Ocean Platform

    Science.gov (United States)

    2003-08-15

    REVIEW, 83-89 Int. Hydrogr. Rev., 1986 ARANHA , JAP PESCE, CP, EFFECT OF THE 2ND-ORDER POTENTIAL IN THE SLOW-DRIFT OSCILLATION OF A FLOATING STRUCTURE...Technology Conference, Annual Proceedings, v 3, Construction & Installation/Field Drilling and Development Systems, 1997, OTC 8696, p 133-142 Aranha , J...Andre J.P. (Petrobras/Depro); Nishimoto, Kazuo; Aranha , J.A.P.; Morooka, Celso K., Minimization of vertical wave exciting force and heave motion of a

  12. Advanced simulations of energy demand and indoor climate of passive ventilation systems with heat recovery and night cooling

    DEFF Research Database (Denmark)

    Hviid, Christian Anker; Svendsen, Svend

    with little energy consumption and with satisfying indoor climate. The concept is based on using passive measures like stack and wind driven ventilation, effective night cooling and low pressure loss heat recovery using two fluid coupled water-to-air heat exchangers developed at the Technical University......In building design the requirements for energy consumption for ventilation, heating and cooling and the requirements for increasingly better indoor climate are two opposing factors. This paper presents the schematic layout and simulation results of an innovative multifunctional ventilation concept...... of Denmark. Through building integration in high performance offices the system is optimized to incorporate multiple functions like heating, cooling and ventilation, thus saving the expenses of separate cooling and heating systems. The simulation results are derived using the state-of-the-art building...

  13. Floating Shaft Load Sharing Method for Face Gear Split Torque Transmission System

    Directory of Open Access Journals (Sweden)

    Ruifeng Wang

    2013-04-01

    Full Text Available In this study, the equivalent gear meshing error principle was used to analysis face gear split torque dynamics modeling, the mathematical model includes stiffness of shaft supporting, position of gears, backlashes, time-varying stiffness, damping, manufacturing error, assembly error. The result shows the floating shaft can achieved load sharing, the support stiffness is an important factor, decreasing the input shaft support stiffness, load sharing performance becomes better and vibration decreases by increasing the displacement of shaft. To study effect of errors, every errors change separately while others’ ideal. Every errors affect load sharing in different way, gear 4 manufacturing error and shaft 2 assembly error affect load sharing most, load sharing cannot achieve by decreasing one error.

  14. Aero-Hydro-Elastic Simulation Platform for Wave Energy Systems and floating Wind Turbines

    DEFF Research Database (Denmark)

    Kallesøe, Bjarne Skovmose

    conversion platform, Poseidon, is own and operated by Floating Power Plant A/S. The platform has been operating for two test periods; one period where it was operating as a wave energy conversion platform only and one period where the three turbines was mounted and the platform operated as a combined wind...... and wave energy platform. The PSO project has equipped the platform with comprehensive measurements equipment for measuring platform motion, wave and wind conditions and turbine loads. Data from the first test period has been used for determine if the turbine could be mounted on the platform. Preliminary...... analysis of data from the second test period indicates that the platform is suitable as wind turbine foundation and that the turbines reduce the platform motion....

  15. Reliability-based dynamic positioning of floating vessels with riser and mooring system

    DEFF Research Database (Denmark)

    Fang, Shaoji; Leira, Bernt J.; Blanke, Mogens

    2011-01-01

    To maintain safety of a floating vessel with associated slender components such as risers and mooring line, the vessel is normally kept within a limited region. To specify a safe position in that region, this paper suggests a new position chasing algorithm with the consideration of both riser...... angles and mooring line tensions. The riser angles were considered in an object function in [1] and the mooring line tension was considered in an object function in [2]. The contribution of this paper is to combine riser angle and mooring line tension together in one unified object function....... A combination of scaled riser angles and structural reliability index is utilized to evaluate the “reserve capacity” relative to failure events. With this object function, the riser angles and mooring line tension are considered in a unified formulation, with higher weight added to the riser angles due...

  16. Formulae for calculating stability of anti-floating anchor and anchor anti-floating system%抗浮锚杆及锚杆抗浮体系稳定性验算公式研究

    Institute of Scientific and Technical Information of China (English)

    付文光; 柳建国; 杨志银

    2014-01-01

    抗浮锚杆及锚杆抗浮体系的抗浮稳定性验算公式宜采用综合安全系数法、分项系数表达方式。群锚稳定性验算可简化为单锚稳定性验算,验算模型可按上半部分长方体、下半部分圆锥体的假定破裂面形状,锥尖深度为锚固段计算长度与自由段长度之和。群锚整体抗浮承载力为单锚抗浮承载力之和,单锚抗浮力设计值可取假定破裂体内岩土体重量与破裂面黏聚力提供的摩阻力分别除以分项安全系数后之和,分项安全系数取值水准为1.5及3.0。锚杆抗浮体系稳定性验算公式中,抗力设计值可取建筑物自重标准值及其上作用的永久荷载标准值之和除以1.05的安全系数、抗拔桩的抗浮承载力设计值、抗浮锚杆的抗浮承载力设计值三者之和,而浮力设计值则取建构筑物基底静水压力标准值。%The comprehensive safety factor methods and partial safety factor expressions should be adopted for the formulae to calculate the stability of anti-floating anchor and anchor anti-floating system. The model for the stability of anchor groups can be simplified as that of single anchor, the fracture surface is assumed that the upper part is cuboid and the lower part is cone, and the depth of conical tip is the sum of the fixed anchor length for calculation and free anchor length. The whole anti-floating bearing capacity of the anchor group is the sum of that of the single anchor. The anti-floating bearing capacity of the single anchor is the sum of the weight of soils inside the fracture body and the frictional resistance supplied by cohesive force on the assumed fracture surface divided by the partial safety factor, which is 1.5 and 3.0, respectively. In the formula for calculating the stability of anchor anti-floating system, the design resistance value is the sum of the design of values anti-floating bearing capacity of uplift piles and anti-floating anchor and the standard

  17. Floating JMaRT

    CERN Document Server

    Bossard, Guillaume

    2014-01-01

    We define a new partially solvable system of equations that parametrises solutions to six-dimensional N=(1,0) ungauged supergravity coupled to tensor multiplets. We obtain this system by applying a series of dualities on the known floating brane system, imposing that it allows for the JMaRT solution. We construct an explicit multi-centre solution generalising the JMaRT solution, with an arbitrary number of additional BPS centres on a line. We describe explicitly the embedding of the JMaRT solution in this system in five dimensions.

  18. Towards sensible floating-point arithmetic

    Energy Technology Data Exchange (ETDEWEB)

    Cody, W.J.

    1980-01-01

    Efforts to promote the development of high-quality transportable numerical software show that few, if any, of the floating-point arithmetic systems in existing computers are completely satisfactory for serious numerical computation. Examination of the defects in these systems leads to specifications for a sensible floating-point system from a numerical analyst's viewpoint. 1 table.

  19. Advanced night vision goggles

    Science.gov (United States)

    Thacker, Clinton

    2003-02-01

    The Advanced Night Vision Goggle (ANVG) program is developing integrated wide field of view (WFOV) helmet-mounted image intensifier night vision goggle systems. ANVG will provide a FOV of approximately 40° (vertical) × 100° (horizontal) and an integrated heads-up display for overlay of flight symbology and/or FLIR imagery. The added FLIR complements the I2 imagery in out of the window or ground applications. ANVG will significantly improve safety, situational awareness, and mission capabilities in differing environments. ANVG achieves the ultra wide FOV using four image intensifier tubes in a head-mounted configuration. Additional features include a miniature flat panel display and a lightweight uncooled FLIR. The integrated design will demonstrate the capability of helmet-mounted I2 and FLIR image fusion. Fusion will be accomplished optically and will offer significant opportunities for ground applications. This paper summarizes the basic technologies, lessons learned, and program status.

  20. Electro-Mechanical Modeling and Performance Analysis of Floating Wave Energy Converters Utilizing Yo-Yo Vibrating System

    Energy Technology Data Exchange (ETDEWEB)

    Sim, Kyuho; Park, Jisu [Seoul National University, Seoul (Korea, Republic of); Jang, Seon-Jun [Innovation KR, Seoul (Korea, Republic of)

    2015-01-15

    This paper proposes a floating-type wave energy conversion system that consists of a mechanical part (yo-yo vibrating system, motion rectifying system, and power transmission system) and electrical part (power generation system). The yo-yo vibrating system, which converts translational input to rotational motion, is modeled as a single degree-of-freedom system. It can amplify the wave input via the resonance phenomenon and enhance the energy conversion efficiency. The electromechanical model is established from impedance matching of the mechanical part to the electrical system. The performance was analyzed at various wave frequencies and damping ratios for a wave input acceleration of 0.14 g. The maximum output occurred at the resonance frequency and optimal load resistance, where the power conversion efficiency and electrical output power reached 48% and 290 W, respectively. Utilizing the resonance phenomenon was found to greatly enhance the performance of the wave energy converter, and there exists a maximum power point at the optimum load resistance.

  1. Evaluation of the long-term sound reduction performance of resilient materials in floating floor systems

    Science.gov (United States)

    Lee, Jung-Yoon; Kim, Jong-Mun; Kim, Jinyoung; Kim, Jeongho

    2016-03-01

    Building multi-dwelling units is one of the practical engineering solutions to housing shortage in urban areas with high population density. However, noise from upstairs is a major issue. The use of resilient materials in floating floor structures is recognized as an effective method to reduce such noise. In general, soft materials are considered as better resilient materials due to their superior performance in impact sound reduction. However, it is often overlooked that the sound reduction performance of soft resilient materials is susceptible to being degraded over time when subjected to a long-term load. In this study, the long-term performance of eight resilient materials is evaluated by monitoring their dynamic stiffness for 270 days under the two sustained load conditions: 250 N and 500 N. According to the experimental study, the dynamic stiffness increases consistently with loading time for all resilient materials. This leads to a decrease in the sound reduction performance. More rapid reduction in the dynamic stiffness and hence in the sound reduction performance is observed when a larger sustained load is applied. A greater decrease in the sound reduction performance is found in soft resilient materials.

  2. Integrated floating cage aquageoponics system (IFCAS: An innovation in fish and vegetable production for shaded ponds in Bangladesh

    Directory of Open Access Journals (Sweden)

    Mohammad Mahfujul Haque

    2015-11-01

    Full Text Available Farmer participatory action research was carried out from July to December 2013 to design and construct a technology known as IFCAS (integrated floating cage aquageoponics system for growing fish and vegetables in shaded ponds in the Barisal region of Bangladesh under the EU funded ANEP (Agriculture and Nutrition Extension Project. Here the terms aqua, geo and ponics means pond water, pond mud/soil and cultivation, respectively. Producing and regularly harvesting fish in shaded ponds and growing vegetables on surrounding dykes for household consumption was constrained. To overcome the difficulties, an IFCAS (3.66 m × 2.44 m = 9 m2 was set in each of 9 shaded ponds – 5 highly shaded ponds (HSP and 4 moderately shaded ponds (MSP – in which GIFT tilapia strain (Orechromis niloticus was stocked at the rate of 100 m−3 cage. In the ponds, carp species (Catla catla, Labeo rohita, Cirrhinus cirrhosus and Cyprinus carpio were stocked at the ratio of 1:2:2:1, and at the rate of 14,820 ha−1. Tilapia were fed floating feed and the carp were fed with supplementary feed. Vegetables were grown on the IFCAS scaffold, and tilapia were grown in the net-cage constructed underneath. Women members of HSP households participated fully in the action research in the production of vegetables and fish in IFCAS. Participating households started consuming vegetables and tilapia from IFCAS within 1.5 and 1 month of the start of the experiment, respectively. Average fish consumption of 20 kg household−1 was recorded within four months, of which more than 50% was tilapia from IFCAS. Overall fish and vegetable production was higher in MSP as compared to HSP. A financial analysis showed the benefit-cost ratio of IFCAS was >1, indicating the investment efficiency of IFCAS for farmers.

  3. Participatory Research to Design a Novel Telehealth System to Support the Night-Time Needs of People with Dementia: NOCTURNAL

    Directory of Open Access Journals (Sweden)

    Suzanne Martin

    2013-12-01

    Full Text Available Strategies to support people living with dementia are broad in scope, proposing both pharmacological and non-pharmacological interventions as part of the care pathway. Assistive technologies form part of this offering as both stand-alone devices to support particular tasks and the more complex offering of the “smart home” to underpin ambient assisted living. This paper presents a technology-based system, which expands on the smart home architecture, orientated to support people with daily living. The system, NOCTURNAL, was developed by working directly with people who had dementia, and their carers using qualitative research methods. The research focused primarily on the nighttime needs of people living with dementia in real home settings. Eight people with dementia had the final prototype system installed for a three month evaluation at home. Disturbed sleep patterns, night-time wandering were a focus of this research not only in terms of detection by commercially available technology but also exploring if automated music, light and visual personalized photographs would be soothing to participants during the hours of darkness. The NOCTURNAL platform and associated services was informed by strong user engagement of people with dementia and the service providers who care for them. NOCTURNAL emerged as a holistic service offering a personalised therapeutic aspect with interactive capabilities.

  4. Offshore Code Comparison Collaboration, Continuation: Phase II Results of a Floating Semisubmersible Wind System: Preprint

    Energy Technology Data Exchange (ETDEWEB)

    Robertson, A.; Jonkman, J.; Musial, W.; Vorpahl, F.; Popko, W.

    2013-11-01

    Offshore wind turbines are designed and analyzed using comprehensive simulation tools that account for the coupled dynamics of the wind inflow, aerodynamics, elasticity, and controls of the turbine, along with the incident waves, sea current, hydrodynamics, and foundation dynamics of the support structure. The Offshore Code Comparison Collaboration (OC3), which operated under the International Energy Agency (IEA) Wind Task 23, was established to verify the accuracy of these simulation tools [1]. This work was then extended under the Offshore Code Comparison Collaboration, Continuation (OC4) project under IEA Wind Task 30 [2]. Both of these projects sought to verify the accuracy of offshore wind turbine dynamics simulation tools (or codes) through code-to-code comparison of simulated responses of various offshore structures. This paper describes the latest findings from Phase II of the OC4 project, which involved the analysis of a 5-MW turbine supported by a floating semisubmersible. Twenty-two different organizations from 11 different countries submitted results using 24 different simulation tools. The variety of organizations contributing to the project brought together expertise from both the offshore structure and wind energy communities. Twenty-one different load cases were examined, encompassing varying levels of model complexity and a variety of metocean conditions. Differences in the results demonstrate the importance and accuracy of the various modeling approaches used. Significant findings include the importance of mooring dynamics to the mooring loads, the role nonlinear hydrodynamic terms play in calculating drift forces for the platform motions, and the difference between global (at the platform level) and local (at the member level) modeling of viscous drag. The results from this project will help guide development and improvement efforts for these tools to ensure that they are providing the accurate information needed to support the design and

  5. Passive perception system for day/night autonomous off-road navigation

    Science.gov (United States)

    Rankin, Arturo L.; Bergh, Charles F.; Goldberg, Steven B.; Bellutta, Paolo; Huertas, Andres; Matthies, Larry H.

    2005-05-01

    Passive perception of terrain features is a vital requirement for military related unmanned autonomous vehicle operations, especially under electromagnetic signature management conditions. As a member of Team Raptor, the Jet Propulsion Laboratory developed a self-contained passive perception system under the DARPA funded PerceptOR program. An environmentally protected forward-looking sensor head was designed and fabricated in-house to straddle an off-the-shelf pan-tilt unit. The sensor head contained three color cameras for multi-baseline daytime stereo ranging, a pair of cooled mid-wave infrared cameras for nighttime stereo ranging, and supporting electronics to synchronize captured imagery. Narrow-baseline stereo provided improved range data density in cluttered terrain, while wide-baseline stereo provided more accurate ranging for operation at higher speeds in relatively open areas. The passive perception system processed stereo images and outputted over a local area network terrain maps containing elevation, terrain type, and detected hazards. A novel software architecture was designed and implemented to distribute the data processing on a 533MHz quad 7410 PowerPC single board computer under the VxWorks real-time operating system. This architecture, which is general enough to operate on N processors, has been subsequently tested on Pentium-based processors under Windows and Linux, and a Sparc based-processor under Unix. The passive perception system was operated during FY04 PerceptOR program evaluations at Fort A. P. Hill, Virginia, and Yuma Proving Ground, Arizona. This paper discusses the Team Raptor passive perception system hardware and software design, implementation, and performance, and describes a road map to faster and improved passive perception.

  6. "Floating shoulder" injuries.

    Science.gov (United States)

    Heng, Kenneth

    2016-12-01

    "Floating shoulder" is a rare injury complex resulting from high-energy blunt force trauma to the shoulder, resulting in scapulothoracic dissociation. It is commonly associated with catastrophic neurovascular injury. Two cases of motorcyclists with floating shoulder injuries are described.

  7. FREE FLOATING EXCHANGE RATE SYSTEM DAN PENERAPANNYA PADA KEBIJAKSANAAN EKONOMI DI NEGARA YANG BERPEREKONOMIAN KECIL DAN TERBUKA

    Directory of Open Access Journals (Sweden)

    Adwin Surya Atmadja

    2001-01-01

    Full Text Available Since the Bretton Wood sistem collapsed in early 1970s, the free floating exchange rate system has been being applied in many countries around the world. The exchange rate system choice is based on some economic advantages that will be obtained from it, considering some economic disadvantages that might be occurred. The valuation toward the advantages and disadvantages of the exchange rate system implementation exactly depends on the national economy it self, because such economy will give some responses in different ways. In a small-opened economy, the effect that occurred in its national economy by the implementation of the floating exchange rate system will be different with the one which is received by a developed country. The exposition about the phenomenon that is happened in the small-opened economy country will become more clearly explainable by Mundell - Fleming - model which is specially developed for those purposes-, and also by some basic theories related with the topic. By using the perfectly capital mobility asumption, Mundell - Fleming model is able to explain the effect of the economic policies implementation, specially fiscal policy and monetary policy, in a small economy country that has already applied the free floating exchange rate system will be different with other countries. Fiscal policy that has been implemented in the country will not significantly alter its national income, but it will cause an alteration in its exchange rate. However, monetary policy implemented in the same countries, will cause changes in its national income as a result of its exchange rate alteration. Abstract in Bahasa Indonesia : Sejak runtuhnya sistem Bretton Wood pada awal tahun 1970-an, sistem nilai tukar mengambang bebas telah diterapkan di banyak negara di dunia. Pemilihan terhadap sistem nilai tukar ini didasarkan kepada keuntungan ekonomis yang akan diperoleh dari padanya, tanpa mengabaikan kerugian yang ditimbulkan. Penilaian terhadap

  8. Study on a Mechanical Semi-Active Heave Compensation System of Drill String for Use on Floating Drilling Platform.

    Directory of Open Access Journals (Sweden)

    Qingyou Liu

    Full Text Available There are some disadvantages for existing heave compensation systems of drill string used for the Floating Drilling Platform (FDP, including high energy consumption, large and complex structure, and expensive manufacturing and maintenance costs. In view of the above, we present a streamlined mechanical semi-active heave compensation system (MSAHC in this study. This system consists of active compensation part with the pinion and rack and passive compensation part. In order to evaluate system performance of the MSAHC, we establish its simulation model with AMEsim software. In the process of simulation, displacement of rotary hook and energy consumption is regarded as performance parameters of the system. And the change rule of two performance parameters are analyzed by changing these design parameters including gear radius of the pinion and rack, scale coefficient of PID, rotary hook load, heave height and heave period of the FDP, and accumulator volume. Then, based on the simulation results of the MSAHC system performance, we have selected out a best set of design parameters from them. Moreover, the feasibility of the design scheme of the MSAHC is effectively verified by comparison with the existing three heave compensation system. The result shows that the energy consumption of the MSAHC is lower than the active heave compensation system (AHC and the semi-active heave compensation system (SAHC when achieving a same compensation effect as well as the accumulator volume of MSAHC is half of the passive heave compensation system (PHC. Therefore, the new designed MSAHC not only ensure compensation effect but also lower energy consumption, and its structure is simplified by adopting the simple mechanical structure to decrease manufacturing cost, maintenance cost and floor space.

  9. Study on a Mechanical Semi-Active Heave Compensation System of Drill String for Use on Floating Drilling Platform

    Science.gov (United States)

    Liu, Qingyou; Tang, Yang; Huang, Chongjun; Xie, Chong

    2015-01-01

    There are some disadvantages for existing heave compensation systems of drill string used for the Floating Drilling Platform (FDP), including high energy consumption, large and complex structure, and expensive manufacturing and maintenance costs. In view of the above, we present a streamlined mechanical semi-active heave compensation system (MSAHC) in this study. This system consists of active compensation part with the pinion and rack and passive compensation part. In order to evaluate system performance of the MSAHC, we establish its simulation model with AMEsim software. In the process of simulation, displacement of rotary hook and energy consumption is regarded as performance parameters of the system. And the change rule of two performance parameters are analyzed by changing these design parameters including gear radius of the pinion and rack, scale coefficient of PID, rotary hook load, heave height and heave period of the FDP, and accumulator volume. Then, based on the simulation results of the MSAHC system performance, we have selected out a best set of design parameters from them. Moreover, the feasibility of the design scheme of the MSAHC is effectively verified by comparison with the existing three heave compensation system. The result shows that the energy consumption of the MSAHC is lower than the active heave compensation system (AHC) and the semi-active heave compensation system (SAHC) when achieving a same compensation effect as well as the accumulator volume of MSAHC is half of the passive heave compensation system (PHC). Therefore, the new designed MSAHC not only ensure compensation effect but also lower energy consumption, and its structure is simplified by adopting the simple mechanical structure to decrease manufacturing cost, maintenance cost and floor space. PMID:26186620

  10. Output characteristics of floating type wave power generator system using a ball screw; Fuyugata nejishiki haryoku hatsuden sochi no shutsuryoku tokusei

    Energy Technology Data Exchange (ETDEWEB)

    Abe, T.; Omata, K. [Meiji University, Tokyo (Japan)

    1996-10-27

    A floating type wave power generator system using a ball screw is proposed. Output characteristics are simulated on the supposition of its employment aboard a navigational aid buoy. The relative linear movement produced by waves between the main body and float is transmitted via a load column to a ball nut and is converted into a rotary movement of a threaded shaft engaging the ball nut. Attached to the bottom end of the threaded shaft is a one-way clutch which connects to the generator axle when the relative velocity between the float and main body is positive. The simulation was conducted for a wave activated power generation buoy, 2.6m in outer diameter, 4.5m in length, and 6000kg in total mass. The buoy generated a mechanical output of 340kW when exposed to a sinusoidal wave 2.5 seconds in period and 40cm in wave height. A tank test was performed using a reduced scale model consisting of a ball screw, bicycle dynamo, and float, with the main body being 318mm in diameter and 833mm in length, when an average output of 4.51W was obtained at 60% efficiency. The results of the experiment agreed in some degree with the results of calculation, verifying the righteousness of the theoretical formula. 3 refs., 7 figs., 4 tabs.

  11. Vision - night blindness

    Science.gov (United States)

    ... People with night blindness often have trouble seeing stars on a clear night or walking through a ... certain drugs Vitamin A deficiency (rare) Nontreatable causes: Birth defects Retinitis pigmentosa

  12. Sleep Terrors (Night Terrors)

    Science.gov (United States)

    Sleep terrors (night terrors) Overview By Mayo Clinic Staff Sleep terrors are episodes of screaming, intense fear and flailing while still asleep. Also known as night terrors, sleep terrors often are paired with sleepwalking. Like ...

  13. Night vision: changing the way we drive

    Science.gov (United States)

    Klapper, Stuart H.; Kyle, Robert J. S.; Nicklin, Robert L.; Kormos, Alexander L.

    2001-03-01

    A revolutionary new Night Vision System has been designed to help drivers see well beyond their headlights. From luxury automobiles to heavy trucks, Night Vision is helping drivers see better, see further, and react sooner. This paper describes how Night Vision Systems are being used in transportation and their viability for the future. It describes recent improvements to the system currently in the second year of production. It also addresses consumer education and awareness, cost reduction, product reliability, market expansion and future improvements.

  14. Measuring Improvement when Using HUB Formats to Implement Floating-Point Systems under Round-to-Nearest

    OpenAIRE

    Hormigo, Javier; Julio, Villalba

    2016-01-01

    This paper analyzes the benefits of using HUB formats to implement floating-point arithmetic under round-tonearest mode from a quantitative point of view. Using HUB formats to represent numbers allows the removal of the rounding logic of arithmetic units, including sticky-bit computation. This is shown for floating-point adders, multipliers, and converters. Experimental analysis demonstrates that HUB formats and the corresponding arithmetic units maintain the same accurac...

  15. Family Reading Night

    Science.gov (United States)

    Hutchins, Darcy; Greenfeld, Marsha; Epstein, Joyce

    2007-01-01

    This book offers clear and practical guidelines to help engage families in student success. It shows families how to conduct a successful Family Reading Night at their school. Family Night themes include Scary Stories, Books We Love, Reading Olympics, Dr. Seuss, and other themes. Family reading nights invite parents to come to school with their…

  16. Dynamic analysis of multibodies system with a floating base for rolling of ro-ro ship caused by wave and slip of heavy load

    Institute of Scientific and Technical Information of China (English)

    SHEN Qing; LI Yue; CHEN Xu-jun

    2003-01-01

    Common effect of wave and slip of internal heavy load will make rolling of the roll-on ship serious. This is one of the important reasons for overturn of ro-ro ships. The multibodies System with a floating base is composed of ro-ro ship and slipping heavy load. This paper takes the rolling angle of the ship and the transverse displacement of the heavy load on desk as two freedoms. Making use of analysis of apparent gravitation and apparent buoyancy, the wave rolling moment is derived. By use of dynamic method of multibodies system with a floating base, dynamic equations of the system are established. Taking a certain channel ferry as an example, a set of numerical calculation have been carried out for rolling response of the ship and displacement response of the slipping heavy load under common effect of synchro-slipping heavy loads and wave.

  17. Evaluation of Biomass Yield and Water Treatment in Two Aquaponic Systems Using the Dynamic Root Floating Technique (DRF

    Directory of Open Access Journals (Sweden)

    Laura Silva

    2015-11-01

    Full Text Available The experiment evaluates the food production and water treatment of TAN, NO2−–N, NO3−–N, and PO43− in two aquaponics systems using the dynamic root floating technique (DRF. A separate recirculation aquaculture system (RAS was used as a control. The fish cultured was Nile tilapia (Oreochromis niloticus. The hydroponic culture in one treatment (PAK was pak choy (Brassica chinensis, and in the other (COR coriander (Coriandrum sativum. Initial and final weights were determined for the fish culture. Final edible fresh weight was determined for the hydroponic plant culture. TAN, NO2−–N, NO3−–N, and PO43− were measured in fish culture and hydroponic culture once a week at two times, morning (9:00 a.m. and afternoon (3:00 p.m.. The fish biomass production was not different in any treatment (p > 0.05 and the total plant yield was greater (p < 0.05 in PAK than in COR. For the hydroponic culture in the a.m., the PO43− was lower (p < 0.05 in the PAK treatment than in COR, and in the p.m. NO3−–N and PO43− were lower (p < 0.05 in PAK than in COR. The PAK treatment demonstrated higher food production and water treatment efficiency than the other two treatments.

  18. Effectiveness of Floating Micro-Bead Bio-Filter for Ornamental Fish in a Re-Circulating Aquaculture System

    Directory of Open Access Journals (Sweden)

    R Fadhil

    2011-01-01

    Full Text Available Bio-filtration has been widely used in re-circulating aquaculture system to remove waste and to convert toxic ammonia andnitrite into safe end products ornamental fish and other aquatic organisms. However, the study of micro-bead usage as the filter medium has not yet been broadened and thoroughly developed. Therefore, the aim of this study is to construct a biological filter made from polyethylene micro-bead as the filter medium and to analyze its effectiveness in removingwaste as well as in converting the toxic organic matter into stable substances. The bio-filter was constructed under a rotational molding process. The tubes, hoses, and piping were made from polyvinyl chloride (PVC while the fasteners were made from stainless steel and other non-corrosive materials. The effectiveness of this bio-filter was measured by using biochemical oxygen demand (BOD and total suspended solids (TSS analysis. Results indicated that this bio-filter is efficient enough to remove suspended solids and BOD. Therefore, this floating micro-bead bio-filter can be used in aquaculture systems.

  19. Floating Cities, Islands and States

    CERN Document Server

    Bolonkin, Alexander

    2008-01-01

    Many small countries are in need of additional territory. They build landfills and expensive artificial islands. The ocean covers 71 per cent of the Earth surface. Those countries (or persons of wealth) starting the early colonization of the ocean may obtain advantages through additional territory or creating their own independent state. An old idea is building a big ship. The best solution to this problem, however, is the provision of floating cities, islands, and states. The author idea is to use for floating cities, islands, and states a cheap floating platform created from a natural ice field taken from the Arctic or Antarctic oceans. These cheap platforms protected by air-film (bottom and sides) and a conventional insulating cover (top) and having a cooling system can exist for an unlimited time. They can be increased in number or size at any time, float in warm oceans, travel to different continents and countries, serve as artificial airports, harbors and other marine improvements, as well as floating c...

  20. A novel method to design water spray cooling system to protect floating roof atmospheric storage tanks against fires

    Directory of Open Access Journals (Sweden)

    Iraj Alimohammadi

    2015-01-01

    Full Text Available Hydrocarbon bulk storage tank fires are not very common, but their protection is essential due to severe consequences of such fires. Water spray cooling system is one of the most effective ways to reduce damages to a tank from a fire. Many codes and standards set requirements and recommendations to maximize the efficiency of water spray cooling systems, but these are widely different and still various interpretations and methods are employed to design such systems. This article provides a brief introduction to some possible design methods of cooling systems for protection of storage tanks against external non-contacting fires and introduces a new method namely “Linear Density Method” and compares the results from this method to the “Average Method” which is currently in common practice. The average Method determines the flow rate for each spray nozzle by dividing the total water demand by the number of spray nozzles while the Linear Density Method determines the nozzle flow rate based on the actual flow over the surface to be protected. The configuration of the system includes a one million barrel crude oil floating roof tank to be protected and which is placed one half tank diameter from a similar adjacent tank with a full surface fire. Thermal radiation and hydraulics are modeled using DNV PHAST Version 6.53 and Sunrise PIPENET Version 1.5.0.2722 software respectively. Spray nozzles used in design are manufactured by Angus Fire and PNR Nozzles companies. Schedule 40 carbon steel pipe is used for piping. The results show that the cooling system using the Linear Density Method consumes 3.55% more water than the design using the average method assuming a uniform application rate of 4.1 liters per minute. Despite higher water consumption the design based on Linear Density Method alleviates the problems associated with the Average Method and provides better protection.

  1. Comparison of Alcian Blue, Trypan Blue, and Toluidine Blue for Visualization of the Primo Vascular System Floating in Lymph Ducts

    Directory of Open Access Journals (Sweden)

    Da-Un Kim

    2015-01-01

    Full Text Available The primo vascular system (PVS, floating in lymph ducts, was too transparent to be observed by using a stereomicroscope. It was only detectable with the aid of staining dyes, for instance, Alcian blue, which was injected into the lymph nodes. Some dyes were absorbed preferentially by the PVS than the lymph wall. It remains a standing problem to know what dyes are absorbed better by the PVS than the lymph walls. Such information would be useful to unravel the biochemical properties of the PVS that are badly in need for obtaining large amount of PVS specimens. In the current work we tried two other familiar dyes which were used in PVS research before. We found that Trypan blue and toluidine blue did not visualize the PVS. Trypan blue was cleared by the natural washing. Toluidine blue did not stain the PVS, but it did leave stained spots in the lymph wall and its surrounding tissues, and it leaked out of the lymph wall to stain surrounding connective tissues. These completely different behaviors of the three dyes were found for the first time in the current work and provide valuable information to elucidate the mechanism through which some special dyes stained the PVS preferentially compared to the lymphatic wall.

  2. A co-beneficial system using aquatic plants: bioethanol production from free-floating aquatic plants used for water purification.

    Science.gov (United States)

    Soda, S; Mishima, D; Inoue, D; Ike, M

    2013-01-01

    A co-beneficial system using constructed wetlands (CWs) planted with aquatic plants is proposed for bioethanol production and nutrient removal from wastewater. The potential for bioethanol production from aquatic plant biomass was experimentally evaluated. Water hyacinth and water lettuce were selected because of their high growth rates and easy harvestability attributable to their free-floating vegetation form. The alkaline/oxidative pretreatment was selected for improving enzymatic hydrolysis of the aquatic plants. Ethanol was produced with yields of 0.14-0.17 g-ethanol/ g-biomass in a simultaneous saccharification and fermentation mode using a recombinant Escherichia coli strain or a typical yeast strain Saccharomyces cerevisiae. Subsequently, the combined benefits of the CWs planted with the aquatic plants for bioethanol production and nutrient removal were theoretically estimated. For treating domestic wastewater at 1,100 m(3)/d, it was inferred that the anoxic-oxic activated sludge process consumes energy at 3,200 MJ/d, whereas the conventional activated sludge process followed by the CW consumes only 1,800 MJ/d with ethanol production at 115 MJ/d.

  3. Analysis of the Potential for Use of Floating Photovoltaic Systems on Mine Pit Lakes: Case Study at the Ssangyong Open-Pit Limestone Mine in Korea

    OpenAIRE

    Jinyoung Song; Yosoon Choi

    2016-01-01

    Recently, the mining industry has introduced renewable energy technologies to resolve power supply problems at mines operating in polar regions or other remote areas, and to foster substitute industries, able to benefit from abandoned sites of exhausted mines. However, little attention has been paid to the potential placement of floating photovoltaic (PV) systems operated on mine pit lakes because it was assumed that the topographic characteristics of open-pit mines are unsuitable for install...

  4. Floating microspheres: a review

    Directory of Open Access Journals (Sweden)

    Jagtap Yogesh Mukund

    2012-03-01

    Full Text Available Gastric emptying is a complex process, one that is highly variable and that makes in vivo performance of drug delivery systems uncertain. A controlled drug delivery system with prolonged residence time in the stomach can be of great practical importance for drugs with an absorption window in the upper small intestine. The main limitations are attributed to the inter- and intra-subject variability of gastro-intestinal (GI transit time and to the non-uniformity of drug absorption throughout the alimentary canal. Floating or hydrodynamically controlled drug delivery systems are useful in such applications. Various gastroretentive dosage forms are available, including tablets, capsules, pills, laminated films, floating microspheres, granules and powders. Floating microspheres have been gaining attention due to the uniform distribution of these multiple-unit dosage forms in the stomach, which results in more reproducible drug absorption and reduced risk of local irritation. Such systems have more advantages over the single-unit dosage forms. The present review briefly addresses the physiology of the gastric emptying process with respect to floating drug delivery systems. The purpose of this review is to bring together the recent literature with respect to the method of preparation, and various parameters affecting the performance and characterization of floating microspheres.O esvaziamento gástrico é um processo complexo, com elevada variabilidade e responsável pela incerteza do desempenho dos medicamentos in vivo. Dessa forma, os sistemas de liberação modificada de fármacos, com tempo de residência prolongado no estômago, em especial, considerando aqueles fármacos com janela de absorção na porção superior do intestino delgado, apresentam fundamental importância. As principais limitações relativas à absorção do fármaco são, no geral, atribuídas à variabilidade inter e intra-paciente do tempo de trânsito gastro-intestinal (GI e

  5. Transient Analysis of Large Scale PV Systems with Floating DC Section

    Directory of Open Access Journals (Sweden)

    George C. Lazaroiu

    2012-09-01

    Full Text Available The increasing penetration of renewable sources with power-electronic interfaces in power systems is raising technical problems and the overall efficiency of photovoltaic systems can decrease dramatically. In this context, the optimal layout for the photovoltaic system is required. The most adequate strategy to connect the renewable system to the electrical power grid or to supply the end users must be adopted. The present paper proposes a design layout of a PV plant using a DC bus system to improve the overall energy conversion efficiency. An analysis of steady-state system stability, voltage drop and DC cable conduction losses is conducted. The leakage currents to the ground are investigated through simulations. Experimental results are shown focused on the analysis of optimal layout of photovoltaic systems under particular operating conditions.

  6. Handling qualities comparison of panoramic night vision goggles and 46-deg. night vision goggles

    Science.gov (United States)

    Craig, Gregory; Jennings, Sion; Thorndycraft, David

    2003-09-01

    Night Vision Goggles allow the user to see in extremely low illumination levels but the visual information provided by Night Vision Goggles has a limited field-of-view that diminishes handling-qualities in the night flying environment. Panoramic Night Vision Goggles were designed to correct this problem by providing a 100° horizontal field-of-view which is larger than currently used Night Vision Goggles. However, in the first generation Panoramic Night Vision Goggle, the improved field of view came at the cost of diminished resolution, contrast and central overlap area when compared to conventional Night Vision Goggles. This paper describes an evaluation that was conducted in the variable stability NRC Bell-205 helicopter to examine the influence on system handling qualities of the Panoramic Night Vision Goggles and a 46° field-of-view UK Night Vision Goggle. Five pilots flew the ADS-33D hover, sidestep and pirouette manoeuvres in simulated night conditions with the UK Night Vision Goggle and the Panoramic Night Vision Goggle. Both subjective and objective measures of task performance were obtained. Handling-qualities ratings showed the pirouette was performed better with the Panoramic Night Vision Goggles. This was the only manoeuvre where there was a clear-cut handling qualities improvement when using the Panoramic Night Vision Goggles. Other manoeuvres such as the sidestep and hover did not show definitive handling qualities rating differences between the two Night Vision Goggle types. The flight test results were interpreted in terms of the design trade-offs of the two night vision systems, with regard to the different acuity, binocular overlaps and fields-of-view.

  7. Wastewater treatment in a compact intensified wetland system at the Badboot: a floating swimming pool in Belgium.

    Science.gov (United States)

    Van Oirschot, D; Wallace, S; Van Deun, R

    2015-09-01

    The Badboot (Dutch for swimming pool boat) is a floating swimming pool located in the city center of Antwerp in Belgium. The overall design consists of a recycled ferry boat that serves as a restaurant and next to that a newly built ship that harbours an Olympic size swimming pool, sun decks, locker rooms with showers, and a party space. A major design goal of the project was to make the ship as environmentally friendly as possible. To avoid discharge of contaminated waste water in the Antwerp docks, the ship includes onsite treatment of wastewater in a compact constructed wetland. The treatment wetland system was designed to treat wastewater from visitor locker rooms, showers, toilets, two bars, and the wastewater from the restaurant kitchen. Due to the limited space on board the ship, only 188 m(2) could be allocated to a wetland treatment system. As a result, part of the design included intensification of the wetland treatment process through the use of Forced Bed Aeration, which injects small quantities of air in a very uniform grid pattern throughout the wetland with a mechanical air compressor. The system was monitored between August 2012 and March 2013 (with additional sampling in the autumn of 2014). Flows and loads to the wetland were highly variable, but removal efficiency was extremely high; 99.5 % for chemical oxygen demand (COD), 88.6 % for total nitrogen and 97.2 % for ammonia. The treatment performance was assessed using a first-order, tanks-in-series model (the P-k-C* model) and found to be roughly equivalent to similar intensified wetlands operating in Germany. However, treatment performance was substantially better than data reported on passive wetlands, likely as a result of intensification. Even with mechanically assisted aeration, the total oxygen delivered to the treatment wetlands was insufficient to support conventional nitrification and denitrification, so it is likely that alternate nitrogen removal pathways, such as anammox, are

  8. Characterizations of plasticized polymeric film coatings for preparing multiple-unit floating drug delivery systems (muFDDSs with controlled-release characteristics.

    Directory of Open Access Journals (Sweden)

    Sheng-Feng Hung

    Full Text Available Effervescent multiple-unit floating drug delivery systems (muFDDSs consisting of drug (lorsartan- and effervescent (sodium bicarbonate-containing pellets were characterized in this study. The mechanical properties (stress and strain at rupture, Young's modulus, and toughness of these plasticized polymeric films of acrylic (Eudragit RS, RL, and NE and cellulosic materials (ethyl cellulose (EC, and Surelease were examined by a dynamic mechanical analyzer. Results demonstrated that polymeric films prepared from Surelease and EC were brittle with less elongation compared to acrylic films. Eudragit NE films were very flexible in both the dry and wet states. Because plasticizer leached from polymeric films during exposure to the aqueous medium, plasticization of wet Eudragit RS and RL films with 15% triethyl citrate (TEC or diethyl phthalate (DEP resulted in less elongation. DEP might be the plasticizer of choice among the plasticizers examined in this study for Eudragit RL to provide muFDDSs with a short time for all pellets to float (TPF and a longer period of floating. Eudragit RL and RS at a 1∶1 ratio plasticized with 15% DEP were optimally selected as the coating membrane for the floating system. Although the release of losartan from the pellets was still too fast as a result of losartan being freely soluble in water, muFDDSs coated with Eudragit RL and RS at a 1∶1 ratio might have potential use for the sustained release of water-insoluble or the un-ionized form of drugs from gastroretentive drug delivery systems.

  9. Floating plant dominance as a stable state

    Science.gov (United States)

    Scheffer, Marten; Szabó, Sándor; Gragnani, Alessandra; van Nes, Egbert H.; Rinaldi, Sergio; Kautsky, Nils; Norberg, Jon; Roijackers, Rudi M. M.; Franken, Rob J. M.

    2003-01-01

    Invasion by mats of free-floating plants is among the most important threats to the functioning and biodiversity of freshwater ecosystems ranging from temperate ponds and ditches to tropical lakes. Dark, anoxic conditions under thick floating-plant cover leave little opportunity for animal or plant life, and they can have large negative impacts on fisheries and navigation in tropical lakes. Here, we demonstrate that floating-plant dominance can be a self-stabilizing ecosystem state, which may explain its notorious persistence in many situations. Our results, based on experiments, field data, and models, represent evidence for alternative domains of attraction in ecosystems. An implication of our findings is that nutrient enrichment reduces the resilience of freshwater systems against a shift to floating-plant dominance. On the other hand, our results also suggest that a single drastic harvest of floating plants can induce a permanent shift to an alternative state dominated by rooted, submerged growth forms. PMID:12634429

  10. Advanced simulations of energy demand and indoor climate of passive ventilation systems with heat recovery and night cooling

    DEFF Research Database (Denmark)

    Hviid, Christian Anker; Svendsen, Svend

    with little energy consumption and with satisfying indoor climate. The concept is based on using passive measures like stack and wind driven ventilation, effective night cooling and low pressure loss heat recovery using two fluid coupled water-to-air heat exchangers developed at the Technical University...

  11. Argentinean Students' and Teachers' Conceptions of Day and Night: An Analysis in Relation to Astronomical Reference Systems

    Science.gov (United States)

    Galperin, D.; Raviolo, A.

    2015-01-01

    This work analysed the evolution of day/night cycle conceptions held by students of different ages and teachers in the Patagonian region of Argentina. The research was based on drawings, written explanations and semi-structured individual interviews. The results showed that both teachers and students had significant comprehension problems. These…

  12. FORMULATION AND EVALUATION OF FLOATING TABLETS OF NORFLOXACIN

    Directory of Open Access Journals (Sweden)

    Ms. Jyoti Rathore

    2015-01-01

    Full Text Available The oral route is considered as the most promising route of drug delivery. Several approaches have been attempted in the preparation of gastro-retentive drug delivery systems. These include floating systems, swell able and expandable systems, high density systems, bioadhesive systems, altered shape systems, gel forming solution or suspension systems and sachet systems. Various approaches have been followed to encourage gastric retention of an oral dosage form. Floating systems have low bul density so that they can float on the gastric juice in the stomach. The problem arises when the stomach is completely emptied of gastric fluid. In such a situation, there is nothing to float on.

  13. Phytofiltration of cadmium from water by Limnocharis flava (L.) Buchenau grown in free-floating culture system

    Energy Technology Data Exchange (ETDEWEB)

    Abhilash, P.C., E-mail: pcabhilash@gmail.com [Eco-Auditing Group, National Botanical Research Institute, Council of Scientific and Industrial Research, Rana Pratap Marg, Lucknow-226 001, Uttar Pradesh (India); School of Environmental Sciences, Mahatma Gandhi University, Priyadharshini Hills P.O., Kottayam- 686 008, Kerala (India); Pandey, Vimal Chandra; Srivastava, Pankaj [Eco-Auditing Group, National Botanical Research Institute, Council of Scientific and Industrial Research, Rana Pratap Marg, Lucknow-226 001, Uttar Pradesh (India); Rakesh, P.S.; Chandran, Smitha [School of Environmental Sciences, Mahatma Gandhi University, Priyadharshini Hills P.O., Kottayam-686 008, Kerala (India); Singh, Nandita [Eco-Auditing Group, National Botanical Research Institute, Council of Scientific and Industrial Research, Rana Pratap Marg, Lucknow-226 001, Uttar Pradesh (India); Thomas, A.P. [School of Environmental Sciences, Mahatma Gandhi University, Priyadharshini Hills P.O., Kottayam-686 008, Kerala (India)

    2009-10-30

    A hydroponics experiment was conducted to examine the phytofiltration of Cd by Limnocharis flava (L.) Buchenau grown in low-level Cd-contaminated water. For this, 45 d old seedlings of L .flava were transferred to a floating-support culture system containing nutrient solution spiked with four levels of Cd (0.5, 1, 2 and 4 mg l{sup -1}) and were separately harvested after 3, 7, 21 and 30 d. After 30 d harvesting, the percentage removal of Cd from the above four treatments reached up to 98, 96, 95 and 93%, respectively. Interestingly, all treatments had higher growth rate than control at 95% confidence level and plants still remained healthy at 4 mg l{sup -1} Cd exposure. The bioaccumulation study showed a linear relationship of Cd (R{sup 2} = 0.896-0.999) in all plant parts with the exposure time (3-30 d) and Cd concentrations in hydroponics system (0.5-4 mg l{sup -1}). Although, the root of L. flava had higher Cd concentration than leaf and peduncles, the total Cd concentrations in aerial plant parts were higher than the roots. The maximum bioconcentration factor (BCF) and translocation factor (TF) value of L. flava were calculated as 984.42 and 1.43, respectively. Estimated Cd accumulation capacity of L. flava per unit area (m{sup 2}) was found to be in the range of 218. 35-1698.92 mg m{sup -2}.The experimental results demonstrated that L. flava is a suitable candidate for the phytofiltartion (>93%) of Cd from low-level Cd-contaminated water.

  14. Field testing driver night vision devices

    NARCIS (Netherlands)

    Kooi, F.L.; Kolletzki, D.

    2007-01-01

    This paper summarizes the available methodologies to field test driver night vision devices ranging from vehicle mounted camera’s to head-mounted NVG’s. As in flight trials, a formidable challenge is to collect meaningful performance measures. Night vision systems for land and air systems show many

  15. Grating exchange system of independent mirror supported by floating rotary stage

    Science.gov (United States)

    Zhang, Jianhuan; Tao, Jin; Liu, Yan; Nan, Yan

    2015-10-01

    The performance of The Grating Exchange System can satisfy the Thirty Meter Telescope - TMT for astronomical observation WFOS index requirements and satisfy the requirement of accuracy in the grating exchange. It is used to install in the MOBIE and a key device of MOBIE. The Wide Field Optical Spectrograph (WFOS) is one of the three first-light observing capabilities selected by the TMT Science Advisory Committee. The Multi-Object Broadband Imaging Echellette (MOBIE) instrument design concept has been developed to address the WFOS requirements as described in the TMT Science-Based Requirements Document (SRD). The Grating Exchange System uses a new type of separate movement way of three grating devices and a mirror device. Three grating devices with a mirror are able to achieve independence movement. This kind of grating exchange system can effectively solve the problem that the volume of the grating change system is too large and that the installed space of MOBIE instruments is too limit. This system adopts the good stability, high precision of rotary stage - a kind of using air bearing (Air bearing is famous for its ultra-high precision, and can meet the optical accuracy requirement) and rotation positioning feedback gauge turntable to support grating device. And with a kind of device which can carry greater weight bracket fixed on the MOBIE instrument, with two sets of servo motor control rotary stage and the mirror device respectively. And we use the control program to realize the need of exercising of the grating device and the mirror device. Using the stress strain analysis software--SolidWorks for stress and strain analysis of this structure. And then checking the structure of the rationality and feasibility. And prove that this system can realize the positioning precision under different working conditions can meet the requirements of imaging optical grating diffraction efficiency and error by the calculation and optical performance analysis.

  16. A Ground Experiment System of a Free-Floating Robot for Fine Manipulation

    Directory of Open Access Journals (Sweden)

    Houde Liu

    2012-11-01

    Full Text Available Robotic systems are expected to play an increasingly important role in future space activities with the development of space technology. One broad area of application is in the servicing, construction and maintenance of satellites and large space structures in orbit. Fine manipulation technology is very important for space robots to be able to perform these tasks, since it must ensure safe and reliable interaction with objects or the environment. In order to assure the task is accomplished successfully, ground experimentations are required in order to verify key planning and control algorithms before the space robot is launched. In this paper, based on the concept of a hybrid approach combining the mathematical model with the physical model, a ground experiment system is set up, which is composed of two industrial robots, global and hand‐eye visual equipment, six‐axis force/torquesensors, guide rail and four computers. Many control approaches of fine manipulation, such as compliance control, impedance control, hybrid force/position control, intelligent control and so on, can be verified using this system. As an example, a contour curves tracking experiment based on the compliance control strategy is performed. Experiment results show that the ground system is very useful for verifying the dexterous manipulation technology of space robots.

  17. Raft and floating radio frequency identification (RFID) antenna systems for detecting and estimating abundance of PIT-tagged fish in rivers

    Science.gov (United States)

    Fetherman, Eric R.; Avila, Brian W.; Winkelman, Dana L.

    2016-01-01

    Portable radio frequency identification (RFID) PIT tag antenna systems are increasingly being used in studies examining aquatic animal movement, survival, and habitat use, and their design flexibility permits application in a wide variety of settings. We describe the construction, use, and performance of two portable floating RFID PIT tag antenna systems designed to detect fish that were unavailable for recapture using stationary antennas or electrofishing. A raft antenna system was designed to detect and locate PIT-tagged fish in relatively long (i.e., ≥10 km) river reaches, and consisted of two antennas: (1) a horizontal antenna (4 × 1.2 m) installed on the bottom of the raft and used to detect fish in shallower river reaches (<1 m), and (2) a vertical antenna (2.7 × 1.2 m) for detecting fish in deeper pools (≥1 m). Detection distances of the horizontal antenna were between 0.7 and 1.0 m, and detection probability was 0.32 ± 0.02 (mean ± SE) in a field test using rocks marked with 32-mm PIT tags. Detection probability of PIT-tagged fish in the Cache la Poudre River, Colorado, using the raft antenna system, which covered 21% of the wetted area, was 0.14 ± 0.14. A shore-deployed floating antenna (14.6 × 0.6 m), which covered 100% of the wetted area, was designed for use by two operators for detecting and locating PIT-tagged fish in shorter (i.e., <2 km) river reaches. Detection distances of the shore-deployed floating antenna were between 0.7 and 0.8 m, and detection probabilities during field deployment in the St. Vrain River exceeded 0.52. The shore-deployed floating antenna was also used to estimate abundance of PIT-tagged fish. Results suggest that the shore-deployed floating antenna could be used as an alternative to estimating abundance using traditional sampling methods such as electrofishing.

  18. Floating-point standards: Theory and practice

    Energy Technology Data Exchange (ETDEWEB)

    Cody, W.J.

    1987-01-01

    ANSI/IEEE Std 754-1985, the IEEE Standard for Binary Floating-Point Arithmetic, has now been joined by IEEE Std 854-1987, A Radix- Independent Standard for Floating-Point Arithmetic. These standards specify floating-point arithmetic systems that are intended to simplify the preparation of high-quality numerical software. The success of these standards hinges on how well they are implemented and how well they are supported by enhancements to algebraic languages. This paper briefly outlines the arithmetic systems specified by the standards, and discusses some existing implementations. 16 refs., 1 tab.

  19. Offshore code comparison collaboration continuation within IEA Wind Task 30: Phase II results regarding a floating semisubmersible wind system

    DEFF Research Database (Denmark)

    Robertson, Amy; Jonkman, Jason M.; Vorpahl, Fabian

    2014-01-01

    in a greater understanding of offshore floating wind turbine dynamics and modeling techniques, and better knowledge of the validity of various approximations. The lessons learned from this exercise have improved the participants’ codes, thus improving the standard of offshore wind turbine modeling....

  20. "Starry Night" on Computer.

    Science.gov (United States)

    Freifeld, Susan

    1998-01-01

    Discusses an exploration of depth in landscape painting using Vincent van Gogh's "Starry Night" as an example. Used computer drawing software for children to allow students to create their own interpretations of "Starry Night" while exploring means of portraying depth in two-dimensional art. (DSK)

  1. Impact on floating membranes

    CERN Document Server

    Vandenberghe, Nicolas

    2016-01-01

    When impacted by a rigid object, a thin elastic membrane with negligible bending rigidity floating on a liquid pool deforms. Two axisymmetric waves radiating from the impact point propagate. In the first place, a longitudinal wave front -- associated with in-plane deformation of the membrane and traveling at constant speed -- separates an outward stress free domain with a stretched but flat domain. Then, in the stretched domain a dispersive transverse wave travels at a wave speed that depends on the local stretching rate. We study the dynamics of this fluid-body system and we show that the wave dynamics is similar to the capillary waves that propagate at a liquid-gas interface but with a surface tension coefficient that depends on impact speed. We emphasize the role of the stretching in the membrane in the wave dynamics but also in the development of a buckling instability that give rise to radial wrinkles.

  2. Floating point arithmetic in future supercomputers

    Science.gov (United States)

    Bailey, David H.; Barton, John T.; Simon, Horst D.; Fouts, Martin J.

    1989-01-01

    Considerations in the floating-point design of a supercomputer are discussed. Particular attention is given to word size, hardware support for extended precision, format, and accuracy characteristics. These issues are discussed from the perspective of the Numerical Aerodynamic Simulation Systems Division at NASA Ames. The features believed to be most important for a future supercomputer floating-point design include: (1) a 64-bit IEEE floating-point format with 11 exponent bits, 52 mantissa bits, and one sign bit and (2) hardware support for reasonably fast double-precision arithmetic.

  3. New CFOA-based floating immittance emulators

    Science.gov (United States)

    Taher Abuelma'atti, Muhammad; Dhar, Sagar Kumar

    2016-12-01

    This paper presents four new topologies for emulating floating immittance functions. Each circuit uses two or three current-feedback operational-amplifiers (CFOAs) and three passive elements. The proposed topologies can emulate positive/negative lossless and lossy floating inductances, and positive/negative capacitance, resistance and inductance multipliers in addition to floating frequency-dependent positive and negative resistances. The functionality of the proposed circuits is verified using the Advanced Design System software and the AD844 CFOA. The simulation results are in excellent agreement with the theoretical calculations.

  4. Night ventilation control strategies in office buildings

    Energy Technology Data Exchange (ETDEWEB)

    Wang, Zhaojun; Yi, Lingli; Gao, Fusheng [School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090 (China)

    2009-10-15

    In moderate climates night ventilation is an effective and energy-efficient approach to improve the indoor thermal environment for office buildings during the summer months, especially for heavyweight construction. However, is night ventilation a suitable strategy for office buildings with lightweight construction located in cold climates? In order to answer this question, the whole energy-consumption analysis software EnergyPlus was used to simulate the indoor thermal environment and energy consumption in typical office buildings with night mechanical ventilation in three cities in northern China. The summer outdoor climate data was analyzed, and three typical design days were chosen. The most important factors influencing night ventilation performance such as ventilation rates, ventilation duration, building mass and climatic conditions were evaluated. When night ventilation operation time is closer to active cooling time, the efficiency of night ventilation is higher. With night ventilation rate of 10 ach, the mean radiant temperature of the indoor surface decreased by up to 3.9 C. The longer the duration of operation, the more efficient the night ventilation strategy becomes. The control strategies for three locations are given in the paper. Based on the optimized strategies, the operation consumption and fees are calculated. The results show that more energy is saved in office buildings cooled by a night ventilation system in northern China than ones that do not employ this strategy. (author)

  5. Preparation and in vitro characterization of non-effervescent floating drug delivery system of poorly soluble drug, carvedilol phosphate

    Directory of Open Access Journals (Sweden)

    Srikanth Meka Venkata

    2014-12-01

    Full Text Available The objective of the study was to enhance the solubility of carvedilol phosphate and to formulate it into non-effervescent floating tablets using swellable polymers. Solid dispersions (SD of carvedilol were prepared with hydrophilic carriers such as polyvinylpyrrolidone and poloxamer to enhance solubility. Non-effervescent floating tablets were prepared with a combination of optimized solid dispersions and release retarding polymers/swellable polymers such as xanthan gum and polyethylene oxide. Tablets were evaluated for physicochemical properties such as hardness, thickness and buoyancy. SD prepared with the drug to poloxamer ratio of 1:4 by melt granulation showed a higher dissolution rate than all other dispersions. Formulations containing 40 mg of polyethylene oxide (C-P40 and 50 mg xanthan gum (C-X50 were found to be best, with the drug retardation up to 12 hours. Optimized formulations were characterized using FTIR and DSC and no drug and excipient interactions were detected.

  6. 浮生——孟加拉chomra地区漂浮农田系统的构建%Floating Life-The Floating Farmland System of Chomra in Bangladesh

    Institute of Scientific and Technical Information of China (English)

    蒋梦雅; 沈忱; 李紫; 李孟迪

    2012-01-01

    The paper introduced the details of the Second Prize work of the 2012 49th IFLA Internationa! College Student Design Competition. Under the background of frequent global climate issues, the designers concern and try to alleviate the plight faced by the growing number of "climate refugees". After a lot of dala collection and exchanges and discussions, combined with the teacher's guidance, the designers determine to take landscape design to improve the lifestyle of Bangladesh climate refugees as the topic. The designers select Chomra of Bangladesh as the study area, and think about how to use the method of landscape design to cope with the challenges of respecting ihe natural water law and minimizing flood hazards on the premise of meeting agricultural needs. The designers put forward the concept of "floaling life" through the research of the current local situation. The designers hope to construct floating farmland system by the use of floating technology in order to provide local residents living place in the flooding period, also form a local new landscape at the same time.%介绍2012年第49届IFAL国际大学生设计竞赛二等奖作品的详细内容.在全球气候问题频发的大背景之下,关心并尝试缓解越来越多的“气候难民”所面临的生活困境,确定以改善孟加拉国气候难民生活方式的景观设计为最终选题.选取孟加拉chomra地区为研究对象,思考如何通过景观的手段,在尊重自然水节规律,满足农业需求的前提下,尽可能减小洪水的危害.通过对当地具体现状的研究,希望能够实践生存空间与水“共生”,提出“浮生”的概念,并希望通过利用漂浮技术,构建出漂浮农田系统,形成一种农业景观模式,为当地居民提供在洪泛期可以栖居、生活的场所,同时也形成当地的新景观.

  7. The Starry Night.

    Science.gov (United States)

    Hausman, Jerome J.

    1985-01-01

    Vincent Van Gogh's painting "The Starry Night" is discussed, and ways that an art teacher can use this painting as a resource for learning are suggested. Specific activities to use with elementary and secondary students are included. (RM)

  8. Urinating more at night

    Science.gov (United States)

    ... calcium level Certain medicines, including water pills (diuretics) Diabetes insipidus Waking often during the night to urinate can ... medicines are you taking? Have you changed your diet? Do you drink caffeine and alcohol? If so, ...

  9. Measurements of CO2 exchange with an automated chamber system throughout the year: challenges in measuring night-time respiration on porous peat soil

    Directory of Open Access Journals (Sweden)

    M. Koskinen

    2014-01-01

    Full Text Available We built an automatic chamber system to measure greenhouse gas (GHG exchange in forested peatland ecosystems. We aimed to build a system robust enough which would work throughout the year and could measure through a changing snowpack in addition to producing annual GHG fluxes by integrating the measurements without the need of using models. The system worked rather well throughout the year, but it was not service free. Gap filling of data was still necessary. We observed problems in carbon dioxide (CO2 respiration flux estimation during calm summer nights, when a CO2 concentration gradient from soil/moss system to atmosphere builds up. Chambers greatly overestimated the night-time respiration. This was due to the disturbance caused by the chamber to the soil-moss CO2 gradient and consequent initial pulse of CO2 to the chamber headspace. We tested different flux calculation and measurement methods to solve this problem. The estimated flux was strongly dependent on (1 the starting point of the fit after closing the chamber, (2 the length of the fit, (3 the type of the fit (linear and polynomial, (4 the speed of the fan mixing the air inside the chamber, and (5 atmospheric turbulence (friction velocity, u*. The best fitting method (the most robust, least random variation for respiration measurements on our sites was linear fitting with the period of 120–240 s after chamber closure. Furthermore, the fan should be adjusted to spin at minimum speed to avoid the pulse-effect, but it should be kept on to ensure mixing. If night-time problems cannot be solved, emissions can be estimated using daytime data from opaque chambers.

  10. Night Eating Disorders

    OpenAIRE

    Deniz Tuncel; Fatma Özlem Orhan

    2009-01-01

    Hunger is an awakening related biological impulse. The relationship between hunger and sleep is moderated by the control of homeostatic and circadian rhytms of the body. Abnormal eating behavior during sleep period could result from different causes. Abnormal eating during the main sleep period has been categorized as either night eating syndrome or sleep related eating disorder. Night eating syndrome (NES) is an eating disorder characterised by the clinical features of morning anorexia, even...

  11. History of the Night

    CERN Document Server

    CERN. Geneva

    2016-01-01

    The definition of the night, as the period between sunset and sunrise, is consistent and unalterable, regardless of culture and time. However the perception of the night and its economic, social, and cultural roles are subject to change. Which parameters determine these changes? What can we learn by studying them about the specific character of a culture? Why do people experience the night in different ways in different historical periods and how did this affect their lives? How do references to nocturnal activities in historical sources (works of art, narratives) reveal what the artists/authors wish to communicate to their audiences? Can the night be a meaningful subject of historical and archaeological enquiry? A study of the source material in the Greek world (ca. 400 BC-ca. AD 400) shows a continuous effort to colonize the night with activities of the day, to make the night safer, more productive, more rational, more efficient. The main motors for this change were social developments and religion, no...

  12. Simulations and Measurements of Human Middle Ear Vibrations Using Multi-Body Systems and Laser-Doppler Vibrometry with the Floating Mass Transducer

    Directory of Open Access Journals (Sweden)

    Tobias Strenger

    2013-10-01

    Full Text Available The transfer characteristic of the human middle ear with an applied middle ear implant (floating mass transducer is examined computationally with a Multi-body System approach and compared with experimental results. For this purpose, the geometry of the middle ear was reconstructed from μ-computer tomography slice data and prepared for a Multi-body System simulation. The transfer function of the floating mass transducer, which is the ratio of the input voltage and the generated force, is derived based on a physical context. The numerical results obtained with the Multi-body System approach are compared with experimental results by Laser Doppler measurements of the stapes footplate velocities of five different specimens. Although slightly differing anatomical structures were used for the calculation and the measurement, a high correspondence with respect to the course of stapes footplate displacement along the frequency was found. Notably, a notch at frequencies just below 1 kHz occurred. Additionally, phase courses of stapes footplate displacements were determined computationally if possible and compared with experimental results. The examinations were undertaken to quantify stapes footplate displacements in the clinical practice of middle ear implants and, also, to develop fitting strategies on a physical basis for hearing impaired patients aided with middle ear implants.

  13. A CMOS floating point multiplier

    Science.gov (United States)

    Uya, M.; Kaneko, K.; Yasui, J.

    1984-10-01

    This paper describes a 32-bit CMOS floating point multiplier. The chip can perform 32-bit floating point multiplication (based on the proposed IEEE Standard format) and 24-bit fixed point multiplication (two's complement format) in less than 78.7 and 71.1 ns, respectively, and the typical power dissipation is 195 mW at 10 million operations per second. High-speed multiplication techniques - a modified Booth's allgorithm, a carry save adder scheme, a high-speed CMOS full adder, and a modified carry select adder - are used to achieve the above high performance. The chip is designed for compatibility with 16-bit microcomputer systems, and is fabricated in 2 micron n-well CMOS technology; it contains about 23000 transistors of 5.75 x 5.67 sq mm in size.

  14. A Midsummer Night's Science

    CERN Document Server

    2001-01-01

    Last year, the first Science Night attracted nearly 1500 people. Dipping into history for the space of one night? This is the idea of Geneva's Museum of the History of Science, which is organizing its second Science Night, on 7 and 8 July, on the history of science. The first such event, held last year, was a considerable success with almost 15 000 visitors. The second Science Night, to be held in the magnificent setting of the Perle du Lac Park in Geneva, promises to be a winner too. By making science retell its own history, this major event is intended to show how every scientific and technical breakthrough is the culmination of a long period of growth that began hundreds of years in the past. Dozens of activities and events are included in this programme of time travel: visitors can study the night sky through telescopes and see what Galileo first observed, and then go to see a play on the life of the Italian scientist. Another play, commissioned specially for the occasion, will honour Geneva botanist De ...

  15. Offshore Code Comparison Collaboration, Continuation within IEA Wind Task 30: Phase II Results Regarding a Floating Semisubmersible Wind System: Preprint

    Energy Technology Data Exchange (ETDEWEB)

    Robertson, A.; Jonkman, J.; Vorpahl, F.; Popko, W.; Qvist, J.; Froyd, L.; Chen, X.; Azcona, J.; Uzungoglu, E.; Guedes Soares, C.; Luan, C.; Yutong, H.; Pengcheng, F.; Yde, A.; Larsen, T.; Nichols, J.; Buils, R.; Lei, L.; Anders Nygard, T.; et al.

    2014-03-01

    Offshore wind turbines are designed and analyzed using comprehensive simulation tools (or codes) that account for the coupled dynamics of the wind inflow, aerodynamics, elasticity, and controls of the turbine, along with the incident waves, sea current, hydrodynamics, and foundation dynamics of the support structure. This paper describes the latest findings of the code-to-code verification activities of the Offshore Code Comparison Collaboration, Continuation (OC4) project, which operates under the International Energy Agency (IEA) Wind Task 30. In the latest phase of the project, participants used an assortment of simulation codes to model the coupled dynamic response of a 5-MW wind turbine installed on a floating semisubmersible in 200 m of water. Code predictions were compared from load-case simulations selected to test different model features. The comparisons have resulted in a greater understanding of offshore floating wind turbine dynamics and modeling techniques, and better knowledge of the validity of various approximations. The lessons learned from this exercise have improved the participants? codes, thus improving the standard of offshore wind turbine modeling.

  16. Organization and management of ATLAS nightly builds

    Science.gov (United States)

    Luehring, F.; Obreshkov, E.; Quarrie, D.; Rybkine, G.; Undrus, A.

    2010-04-01

    The automated multi-platform software nightly build system is a major component in the ATLAS collaborative software organization, validation and code approval schemes. Code developers from ATLAS participating Institutes spread all around the world use about 30 branches of nightly releases for testing new packages, verification of patches to existing software, and migration to new platforms and compilers. The nightly releases lead up to, and are the basis of, stable software releases used for data processing worldwide. The ATLAS nightly builds are managed by the fully automated NICOS framework on the computing farm with 44 powerful multiprocessor nodes. The ATN test tool is embedded within the nightly system and provides results shortly after full compilations complete. Other test frameworks are synchronized with NICOS jobs and run larger scale validation jobs using the nightly releases. NICOS web pages dynamically provide information about the progress and results of the builds. For faster feedback, e-mail notifications about nightly releases problems are automatically distributed to the developers responsible.

  17. Recent innovations in design of mooring systems for floating production and drilling units; Recentes inovacoes no projeto de sistemas de ancoragem para unidades de producao e perfuracao flutuantes

    Energy Technology Data Exchange (ETDEWEB)

    Castro, Gustavo A.V.; Henriques, Carlos [PETROBRAS, Rio de Janeiro, RJ (Brazil)

    1998-07-01

    This paper describes the recent technological innovations adopted in the design of mooring systems for floating platforms. Three points that represent new frontiers in deep water mooring will be focused: In the first point the innovative concept of taut-leg mooring will be shown. In the second point the application of poliester ropes in the mooring of floating platforms will be described, stressing the characteristics of this kind of rope that are fundamental to make feasible the concept of taut-leg mooring. In the third point the utilization of vertically loaded anhors (VLA's) for fixation of mooring lines to the marine bed will be explored. The VLA development program with two manufacturer will be detailed, including prototype and full scale tests done at Campos Basin. The characteristics of some platforms installed in Campos Basin using the above technologies will be shown, stressing the benefits of taut-leg mooring and including comparisons with conventional mooring. The installation of PETROBRAS-27 (first production unit installed with VLA's) will be detailed, to point the advantages and disadvantages of using Vertical Loaded Anhors compared to more conventional fixation points (piles). In the recent years, we have seen a movement of oil industry towards fields located in deeper and deeper waters. The utilization of the described technologies drives a big impulse to the technical and economical viabilization of deep water projects. (author)

  18. Impact on floating membranes

    Science.gov (United States)

    Vandenberghe, Nicolas; Duchemin, Laurent

    2016-05-01

    When impacted by a rigid body, a thin elastic membrane with negligible bending rigidity floating on a liquid pool deforms. Two axisymmetric waves radiating from the impact point propagate. First, a longitudinal wave front, associated with in-plane deformation of the membrane and traveling at constant speed, separates an outward stress-free domain from a stretched domain. Then, in the stretched domain a dispersive transverse wave travels at a speed that depends on the local stretching rate. The dynamics is found to be self-similar in time. Using this property, we show that the wave dynamics is similar to the capillary waves that propagate at a liquid-gas interface but with a surface tension coefficient that depends on impact speed. During wave propagation, we observe the development of a buckling instability that gives rise to radial wrinkles. We address the dynamics of this fluid-body system, including the rapid deceleration of an impactor of finite mass, an issue that may have applications in the domain of absorption of impact energy.

  19. Review of Drill String Heave Compensation Systems for Floating Drilling Platform%浮式钻井钻柱升沉补偿概述

    Institute of Scientific and Technical Information of China (English)

    陈祖波; 吕岩; 李志刚; 高杭

    2011-01-01

    分析了各种浮式钻井钻柱升沉补偿装置的原理、优缺点和应用情况,简述了国内外对海洋平台升沉补偿系统的研究现状,并结合我国现有资源和技术对发展深水钻井关键设备的前景提出了展望.%In this paper, the principles, applications, advantages and disadvantages of all kinds of drill string heave compensation systems for floating drilling platforms are compared,and then the present research situation of heave compensation systems for offshore platforms at home and abroad is briefly introduced. Finally,based on the current resources and technologies of China,the prospects for developing key equipments in deep water drilling are described.

  20. Night Eating Disorders

    Directory of Open Access Journals (Sweden)

    Deniz Tuncel

    2009-08-01

    Full Text Available Hunger is an awakening related biological impulse. The relationship between hunger and sleep is moderated by the control of homeostatic and circadian rhytms of the body. Abnormal eating behavior during sleep period could result from different causes. Abnormal eating during the main sleep period has been categorized as either night eating syndrome or sleep related eating disorder. Night eating syndrome (NES is an eating disorder characterised by the clinical features of morning anorexia, evening hyperphagia, and insomnia with awakenings followed by nocturnal food ingestion. Recently night eating syndrome, conceptualized as a delayed circadian intake of food. Sleep-related eating disorder, thought to represent a parasomnia and as such included within the revised International Classification of Sleep Disorders (ICSD-2, and characterized by nocturnal partial arousals associated with recurrent episodes of involuntary food consumption and altered levels of consciousness. Whether, however, sleep-related eating disorder and night eating syndrome represent different diseases or are part of a continuum is still debated. This review summarizes their characteristics, treatment outcomes and differences between them.

  1. A Night's Sleep, Ultracheap

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    @@ You tote your own luggage, the bed's a bit stiff, and the decor in the spartan rooms and lobby is reminiscent of a college dorm. Oh-and you can't buy a beer. But for $22 a night,the indi One Hotel is one heck of a bargain.

  2. A night sky model.

    Science.gov (United States)

    Erpylev, N. P.; Smirnov, M. A.; Bagrov, A. V.

    A night sky model is proposed. It includes different components of light polution, such as solar twilight, moon scattered light, zodiacal light, Milky Way, air glow and artificial light pollution. The model is designed for calculating the efficiency of astronomical installations.

  3. Floating car data for traffic monitoring

    DEFF Research Database (Denmark)

    Torp, Kristian; Lahrmann, Harry Spaabæk

    2005-01-01

    This paper describes a complete prototype system that uses Floating Car Data (FCD) for both automatic and manual detection of queues in traffic. The system is developed under EU’s Tempo program. The systems consists of small hardware units placed in mobile traffic report units (we use taxis...

  4. FLOAT Project - Task 1

    DEFF Research Database (Denmark)

    Marchalot, Tanguy; Kofoed, Jens Peter; Sørensen, Eigil V.

    The objective of the FLOAT project is to study the reliability of high-performance fibre-reinforced concrete, also known as Compact Reinforced Composite (CRC), for the floats of wave energy converters. In order to reach commercial breakthrough, wave energy converters need to achieve a lower price...... of energy produced, comparable to prices currently obtained from offshore wind power, and this can be done by the use of more suitable materials. The flotation device is a key part of converters, as it accounts for a considerable share of initial investment, up to 27% depending on the converter (dexawave.......com, 2011). CRC floats could be a very cost-effective technology with enhanced loading capacity and environmental resistance, and very low maintenance requirements, affecting directly the final energy price. The project involves DEXA Wave Energy Ltd, Wave Star A/S, Aalborg University and Hi-Con A...

  5. Night cough and general practice research.

    Science.gov (United States)

    Toop, L J; Howie, J G; Paxton, F M

    1986-02-01

    Thirty-four children, aged between three and nine years, presenting with nocturnal cough, were studied on successive nights using an automatic voice activated tape recorder system. Children with a family history of atopy coughed significantly more than children without such a family history. A wide variation in cough frequency was found both between and within subjects. No effects of treatment on cough frequency were demonstrated. Some of the physiological and pathological mechanisms underlying night cough are discussed.

  6. Floating offshore turbines

    DEFF Research Database (Denmark)

    Tande, John Olav Giæver; Merz, Karl; Schmidt Paulsen, Uwe

    2014-01-01

    phase applying (mostly) well-known technology, albeit in a new setting. DeepWind is a European research project based mostly on new technology. The concepts are described in some detail with emphasis on control and operation. Prospects are discussed including technical challenges and a performance...... metric of energy production per unit steel mass. Floating offshore wind turbines represent a promising technology. The successful operation of HyWind and WindFloat in full scale demonstrates a well advanced technology readiness level, where further development will go into refining the concepts, cost...

  7. Floating Versus Sinking

    Science.gov (United States)

    Vella, Dominic

    2015-01-01

    Small objects that are more dense than water may still float at the air-water interface because of surface tension. Whether this is possible depends not only on the density and size of the object, but also on its shape and surface properties, whether other objects are nearby, and how gently the object is placed at the interface. This review surveys recent work to quantify when objects can float and when they must sink. Much interest in this area has been driven by studies of the adaptations of water-walking insects to life at interfaces. I therefore discuss these results in the context of this and other applications.

  8. Fundamental study on PV system for floating water power device `Mighty Whale`; Okiai futaishiki haryoku sochi `Mighty Whale` eno taiyoko hatsuden sochi tosai no kihon kento

    Energy Technology Data Exchange (ETDEWEB)

    Washio, Y. [Japan Marine Science and Technology Center, Kanagawa (Japan)

    1996-10-27

    Studied in this paper is the use of a photovoltaic power generation system in combination with a wave energy conversion system to cover the latter`s weak point that it is available but intermittently. An offshore floating wave power device Mighty Whale (MW) is described, which will have a wave energy absorbing air chamber in the front and an anti-rocking float that looks like a whale in the rear. The movement, up and down and back and forth, of the water surface in the air chamber due to incident waves turns the power generator turbine. Out of the space available on the MW, a 200m{sup 2} area has been specified as the place suitable for the installation of solar cells capable of a maximum output of 20kW, for which specification the elevation of the sun has been taken into account. Batteries will routinely be supplied with power in parallel from the wave activated and photovoltaic devices, the supply will be limited when the batteries are fully charged, and an auxiliary power generator will be run in case of shortage. Power that can be provided by a 20kW solar array was calculated using actual data of sunshine on the slope for each array orientation, and required battery capacity was calculated for each solar array orientation. Important items for consideration for the insurance of reliability on the ocean include measures against salt damage, detailed designing of wiring, and coordinated operation of photovoltaic and wave activated power generation systems. 3 refs., 6 figs., 5 tabs.

  9. Tethered float liquid level sensor

    Energy Technology Data Exchange (ETDEWEB)

    Daily, III, William Dean

    2016-09-06

    An apparatus for sensing the level of a liquid includes a float, a tether attached to the float, a pulley attached to the tether, a rotation sensor connected to the pulley that senses vertical movement of said float and senses the level of the liquid.

  10. Floating patella associated with lymphoedema

    Science.gov (United States)

    Vun, Shen Hwa; Bayam, Levent; Drampalos, Efstathios; Jesry, Mohammed; Fadel, George

    2015-01-01

    Ipsilateral injury of more than one component of the knee extensor apparatus is rare. It is mostly associated with previous trauma, surgery, immunosuppression therapy and systemic disease. We present the first documented case of a spontaneous bifocal disruption of the knee extensor apparatus (i.e. floating patella) associated with lymphoedema. This case highlights the importance of considering lymphoedema as another risk factor for rupture of the knee extensor apparatus. It also highlights the importance of assessing all components of the knee extensor apparatus in patients presenting with acute knee injuries. PMID:25802253

  11. Electrowetting in a water droplet with a movable floating substrate

    Science.gov (United States)

    Shahzad, Amir; Masud, A. R.; Song, Jang-Kun

    2016-05-01

    Electrowetting (EW) enables facile manipulation of a liquid droplet on a hydrophobic surface. In this study, manipulation of an electrolyte droplet having a small floating object on it was investigated on a solid hydrophobic substrate under the EW process. Herein, the floating object exhibited a vertical motion under an applied electric field owing to the spreading and contraction of the droplet on its connecting substrates. The field-induced height variation of the floating object was significantly influenced by the thicknesses of the dielectric and hydrophobic materials. A small mass was also placed on the top floating object and its effect on the spreading of the droplet was observed. In this system, the height of the top floating object is precisely controllable under the application of an electric voltage. The proposed system is expected to be highly useful in the design of nano- and micro-oscillatory systems for microengineering.

  12. Dynamically Reconfigurable Processor for Floating Point Arithmetic

    Directory of Open Access Journals (Sweden)

    S. Anbumani,

    2014-01-01

    Full Text Available Recently, development of embedded processors is toward miniaturization and energy saving for ecology. On the other hand, high performance arithmetic circuits are required in a lot of application in science and technology. Dynamically reconfigurable processors have been developed to meet these requests. They can change circuit configuration according to instructions in program instantly during operations.This paper describes, a dynamically reconfigurable circuit for floating-point arithmetic is proposed. The arithmetic circuit consists of two single precision floating-point arithmetic circuits. It performs double precision floating-point arithmetic by reconfiguration. Dynamic reconfiguration changes circuit construction at one clock cycle during operation without stopping circuits. It enables reconfiguration of circuits in a few nano seconds. The proposed circuit is reconfigured in two modes. In first mode it performs one double precision floating-point arithmetic or else the circuit will perform two parallel operations of single precision floating-point arithmetic. The new system design reduces implementation area by reconfiguring common parts of each operation. It also increases the processing speed with a very little number of clocks.

  13. High Accuracy Fast Floating-point Algorithm on Radar Terminal System%雷达终端高精度快速浮点算法研究

    Institute of Scientific and Technical Information of China (English)

    韩文俊; 张晓明; 杨东华

    2012-01-01

    In radar terminal system, floating-point operation when implemented in FPGA is time-consuming and with high resource u-tilization. After comparing current floating-point processing methods, CORDIC algorithm with high processing performance is selected. The theory of CORDIC algorithm is introduced in depth and the influence of bit wide and the iteration numbers to the accuracy is discussed by simulating. Finally, the implementation of arctan function in FPGA as an example is presented in detail. The results show that the speed is up to 210 MHz, the resource utilization is lower and the accuracy is higher which is also easy adjusted.%针对雷达终端处理过程中,浮点运算在现场可编程门阵列(FPGA)中实现较为耗时、资源占用较高的问题,首先在分析对比当前主要浮点处理方法的基础上,选择CORDIC算法进行浮点处理,并对算法原理进行了详细的介绍,通过仿真,分析了位宽及迭代次数对精度的影响.然后,以arctan函数为例详细介绍了其在FPGA中实现的方法,结果显示arctan流水运算速度可达200 MHz,资源占用率较低、实时性强、精度较高且易于调整.

  14. Dazzling Displays of Fireworks and Lanterns Shine the Night of Paris

    Institute of Scientific and Technical Information of China (English)

    LiShegxian

    2004-01-01

    The night of July 2, 2004. The Palace of Versaille. Chinese-style red palace lanterns glittered amid trees and lotus lights with oriental charm floated in the lake. Distinguished guests from China and thousands of French celebrities and officials gathered to await the closing of China Cultural Year. When the clock struck twelve, vigorous music suddenly sounded

  15. Design of Floating Point Unit Verification System Based on Embedded Method%基于嵌入式方法的浮点单元验证系统设计

    Institute of Scientific and Technical Information of China (English)

    王云贵; 杨靓

    2012-01-01

    The verification of floating point unit is a big challenge. Based on Xilinx FX series FPGA which have powerpc405 hardcore embedded in it, use embedded system develop tool EDK, design an embedded system to verify floating point unit. The principium is through APU controller link user ip (the floating point unit under verification) to powerpc 405 core, write test program, through user defined instruction to access user ip, according to the instruction result we can know whether the floating point unit can function correctly in real circuit.%浮点单元的验证是最具挑战性的任务之一.基于Xilinx FX系列带powerpc 405硬核的FPGA,利用嵌入式系统开发套件EDK,设计了一个嵌入式系统对浮点单元进行验证.验证原理为把用户IP(被测浮点单元)通过APU控制器连接到powerpc 405处理器核,编写测试程序,通过自定义指令对用户IP进行访问,根据程序的运算结果判断被测IP的正确性.

  16. Floating Collection in an Academic Library: An Audacious Experiment That Succeeded

    Science.gov (United States)

    Coopey, Barbara; Eshbach, Barbara; Notartomas, Trish

    2016-01-01

    Can a floating collection thrive in a large multicampus academic research library? Floating collections have been successful in public libraries for some time, but it is uncommon for academic libraries and unheard of for a large academic library system. This article will discuss the investigation into the feasibility of a floating collection at…

  17. Block floating point for radar data

    DEFF Research Database (Denmark)

    Christensen, Erik Lintz

    1999-01-01

    Integer, floating point, and block floating point (BFP) data formats are analyzed and compared in order to establish the mathematical tools for selection of an optimal format which fulfils the demands of high resolution radar (SAR) data to large dynamic range and adequate S/N. The analysis takes...... quantization noise and saturation distortion into account and concludes that it is preferred to use small blocks and a (new) modified BFP format applying fractional exponents. Data from the EMISAR radar system are applied to illustrate the merits of the different schemes....

  18. 浮式钻井平台补偿系统的建模与分析%Modeling and Analysis of Compensation System for Floating Drilling Platform

    Institute of Scientific and Technical Information of China (English)

    王勇; 杨丽红; 马毅; 禹文锋

    2015-01-01

    在前人研究的基础上对浮式钻井平台钻柱主动补偿系统的关键装置建立数学模型。对主动补偿系统重要组成部分———动力部分和控制部分进行分析,在理论分析的基础上提出对这两部分的改进建议,为进一步提高升沉补偿系统的能力及精度提供了理论依据。%On the basis of previous research on the drilling string heave compensation system for floating drilling platform , the mathematical model of a drill string heave compensation system was set up .The power part and control part of drill string heave compensation system was analyzed .Based on theoretical analysis ,some suggestion to further improve the heave compensation system was put forward ,in order to provide theoretical basis for the improvement of the compensation ability of the system .

  19. Floating point coprocessor upgrade

    Energy Technology Data Exchange (ETDEWEB)

    Weber, T.

    1987-04-01

    A method was developed to increase the throughput of the Hewlett Packard, 98635A floating point processor equipped, model 236C computer. The increase was carried out in three phases each with a clock and or chip change during the modification. Two programs were written to test the results and evaluate the increases in performance made to the computer. The first one shows reduction in processing times of 34.3%, while the other recorded 34.6%.

  20. Impact on floating membranes

    OpenAIRE

    Vandenberghe, Nicolas; Duchemin, Laurent

    2016-01-01

    When impacted by a rigid object, a thin elastic membrane with negligible bending rigidity floating on a liquid pool deforms. Two axisymmetric waves radiating from the impact point propagate. In the first place, a longitudinal wave front -- associated with in-plane deformation of the membrane and traveling at constant speed -- separates an outward stress free domain with a stretched but flat domain. Then, in the stretched domain a dispersive transverse wave travels at a wave speed that depends...

  1. The Sky at Night

    CERN Document Server

    Moore, Patrick

    2010-01-01

    For more than 50 years now Sir Patrick Moore has presented the BBC Television series Sky at Night; not a month has been missed – a record for any television series, and a record which may never be broken. Every three years or so a book is published covering the main events in both astronomy and space research. This is the 13th volume, not only a record of the programmes but also of the great advances and discoveries during the period covered - eclipses, comets, and the strange chemical lakes of Titan, for instance, but also anniversaries such as the fifteenth “birthday” of the Hubble Space Telescope, and not forgetting the programme celebrating the Sky at Night’s 50th year, attended by astronaut Piers Sellars and many others who appeared on the programme over the years. All the chapters are self-contained, and fully illustrated. In this new Sky at Night book you will find much to entertain you. It will appeal to amateurs and professionals alike.

  2. Balloon Pump with Floating Valves for Portable Liquid Delivery

    Directory of Open Access Journals (Sweden)

    Yuya Morimoto

    2016-03-01

    Full Text Available In this paper, we propose a balloon pump with floating valves to control the discharge flow rates of sample solutions. Because the floating valves were made from a photoreactive resin, the shapes of the floating valves could be controlled by employing different exposure patterns without any change in the pump configurations. Owing to the simple preparation process of the pump, we succeeded in changing the discharge flow rates in accordance with the number and length of the floating valves. Because our methods could be used to easily prepare balloon pumps with arbitrary discharge properties, we achieved several microfluidic operations by the integration of the balloon pumps with microfluidic devices. Therefore, we believe that the balloon pump with floating valves will be a useful driving component for portable microfluidic systems.

  3. A methodology for risk analysis based on hybrid Bayesian networks: application to the regasification system of liquefied natural gas onboard a floating storage and regasification unit.

    Science.gov (United States)

    Martins, Marcelo Ramos; Schleder, Adriana Miralles; Droguett, Enrique López

    2014-12-01

    This article presents an iterative six-step risk analysis methodology based on hybrid Bayesian networks (BNs). In typical risk analysis, systems are usually modeled as discrete and Boolean variables with constant failure rates via fault trees. Nevertheless, in many cases, it is not possible to perform an efficient analysis using only discrete and Boolean variables. The approach put forward by the proposed methodology makes use of BNs and incorporates recent developments that facilitate the use of continuous variables whose values may have any probability distributions. Thus, this approach makes the methodology particularly useful in cases where the available data for quantification of hazardous events probabilities are scarce or nonexistent, there is dependence among events, or when nonbinary events are involved. The methodology is applied to the risk analysis of a regasification system of liquefied natural gas (LNG) on board an FSRU (floating, storage, and regasification unit). LNG is becoming an important energy source option and the world's capacity to produce LNG is surging. Large reserves of natural gas exist worldwide, particularly in areas where the resources exceed the demand. Thus, this natural gas is liquefied for shipping and the storage and regasification process usually occurs at onshore plants. However, a new option for LNG storage and regasification has been proposed: the FSRU. As very few FSRUs have been put into operation, relevant failure data on FSRU systems are scarce. The results show the usefulness of the proposed methodology for cases where the risk analysis must be performed under considerable uncertainty.

  4. Research on drill string heave compensation system for floating drilling platform%浮式钻井平台钻柱升沉补偿系统研究

    Institute of Scientific and Technical Information of China (English)

    姜浩; 刘衍聪; 张彦廷; 刘振东; 武光斌

    2011-01-01

    在前人研究基础上提出一种半主动浮式钻井平台钻柱升沉补偿方案,将被动补偿能耗低和主动补偿精度高的特点有机结合在一起.建立系统数学模型,在仿真基础上,设计并搭建升沉补偿试验台,进行被动、主动和半主动的升沉补偿试验.结果表明,基于蓄能器的半主动升沉补偿系统收敛速度快,性能稳定,补偿效果较好,可以补偿平台97%的升沉运动.%For floating drilling platform, a new type of semi-active drill string heave compensation system was designed, assembling the advantages of passive and active compensator into one whole. A mathematical model was built, and with the result of simulation, the heave compensation test bed was built. A great number of experiments for passive, active and semi-active heave compensation indicate that the semi-active heave compensation system is of fast convergence, stable performance and more effective in compensation effect. The system can compensate for 97% of the heave motion.

  5. 提高生态浮床系统脱氮除磷效率研究进展%Advance in Improving the Removal Efficiency of Nitrogen and Phosphorus of Ecological Floating Bed System

    Institute of Scientific and Technical Information of China (English)

    汪开英; 郑水生; 郭宗楼; 徐文彬

    2012-01-01

    Nitrogen and phosphorus contained in agricultural effluents and industrial wastewaters were mainly responsible for water eutrophication. At present, there were many approaches can be used to remove nitrogen and phosphorus, such as the constructed wetland, the ecological floating bed, etc. Ecological floating bed processing technology, as a kind of wastewater treatment technology with high efficiency, low costs, easy-operation, no secondary pollution and excellent landscape, was widely used for the restoration of eutrophic water bodies such as lakes, streams, reservoirs and ponds. Some floating bed can provide economic returns and generate valuable products, e.g., biogas, bio-fertilizer, biomaterial, and even animal food. Ecological floating bed was an integrated eco-engineering system. The pollutants removal functioning were also a complex processes, in which substrate, aquatic plants, aquatic animal, microorganism play the important role together. On one hand, the floating bed plants can absorb the nitrogen, phosphorus and other elements as nutrition on their growth processing, remove the nitrogen and phosphorus from the water by harvesting aquatic plant. The floating bed plant roots also adsorb the suspended particles; on the other hand, the microorganisms which attached on the plant roots and substrate played the major role in removing pollutants; some plants can secrete chemical grams of biomass to inhibit the growth of phytoplankton; some plants can improve water conditions by secrete oxygen for aerobic microorganisms. This paper illustrated the floating bed development progress, efficiency and functioning of nitrogen and phosphorus removal, limited factors and existing problems, mainly illustrated the external methods such as bacteria immobilized technology, aeration and the inherent methods such as improving the structural form of ecological floating bed, screening advantage aquatic plants to enhance the efficiency of nitrogen and phosphorus removal in the

  6. 烤烟两段式少基质漂浮育苗对烟苗素质的影响%Effects of Two-stage Little Medium Floating System of Flue-cured Tobacco on Quality of Tobacco Seedling

    Institute of Scientific and Technical Information of China (English)

    曾淑华; 熊成文; 胡永龙; 刘雷; 郭仕平; 覃太友

    2012-01-01

    In order to provide theory evidence for popularization and application of two-stage little medium floating system studies of tobacco seedling quality were carried out to compare two-stage little medium floating system with common floating system. Agronomic traits and some physiological and biochemical indexes were determined respectively on the two kinds of seedling methods. The results showed that plant height, stem circumference, stem height and leave number had no significant difference. Chlorophyll content of the two kinds of seedling methods was equal to each other. However, the root number and root activity of little medium floating system were significantly higher than those of common floating system. The medium was saved by 85% in two-stage little medium floating system. Meanwhile, the cost and peat (non-renewable resources) were dramatically reduced, which played an important role in protecting ecological environment.%为了给实际生产中推广应用烤烟两段式少基质漂浮育苗提供理论依据,研究了烤烟两段式少基质漂浮育苗与常规漂浮育苗对烟苗素质的影响,分别测定了两种育苗方式烟苗成苗主要农艺性状指标和生理生化指标.结果表明:两种育苗方式烟苗的株高、茎围、茎高、有效叶片数等农艺性状无明显差异;两种育苗方式成苗期烟苗叶片叶绿素含量相当,但两段式少基质漂浮育苗的根系数量及根系活力均明显高于常规漂浮育苗.两段式少基质漂浮育苗可节约85%左右的基质用量,育苗基质成本大幅降低,同时有效减少草炭(泥炭)不可再生资源的消耗,对保护生态环境具有重要意义.

  7. Collapsing floating-point operations

    OpenAIRE

    Defour, David

    2004-01-01

    This paper addresses the issue of collapsing dependent floating-point operations. The presentation focuses on studying the dataflow graph of benchmark involving a large number of floating-point instructions. In particular, it focuses on the relevance of new floating-point operators performing two dependent operations which are similar to "fused multiply and add". Finally, this paper examines the implementation cost and critical path reduction from this strategy.

  8. Multi-input and binary reproducible, high bandwidth floating point adder in a collective network

    Energy Technology Data Exchange (ETDEWEB)

    Chen, Dong; Eisley, Noel A.; Heidelberger, Philip; Steinmacher-Burow, Burkhard

    2016-11-15

    To add floating point numbers in a parallel computing system, a collective logic device receives the floating point numbers from computing nodes. The collective logic devices converts the floating point numbers to integer numbers. The collective logic device adds the integer numbers and generating a summation of the integer numbers. The collective logic device converts the summation to a floating point number. The collective logic device performs the receiving, the converting the floating point numbers, the adding, the generating and the converting the summation in one pass. One pass indicates that the computing nodes send inputs only once to the collective logic device and receive outputs only once from the collective logic device.

  9. Multi-input and binary reproducible, high bandwidth floating point adder in a collective network

    Energy Technology Data Exchange (ETDEWEB)

    Chen, Dong; Eisley, Noel A; Heidelberger, Philip; Steinmacher-Burow, Burkhard

    2015-03-10

    To add floating point numbers in a parallel computing system, a collective logic device receives the floating point numbers from computing nodes. The collective logic devices converts the floating point numbers to integer numbers. The collective logic device adds the integer numbers and generating a summation of the integer numbers. The collective logic device converts the summation to a floating point number. The collective logic device performs the receiving, the converting the floating point numbers, the adding, the generating and the converting the summation in one pass. One pass indicates that the computing nodes send inputs only once to the collective logic device and receive outputs only once from the collective logic device.

  10. Floating shoulder” injuries

    OpenAIRE

    Heng, Kenneth

    2016-01-01

    Floating shoulder” is a rare injury complex resulting from high-energy blunt force trauma to the shoulder, resulting in scapulothoracic dissociation. It is commonly associated with catastrophic neurovascular injury. Two cases of motorcyclists with floating shoulder injuries are described.

  11. 耒阳市烤烟漂浮式增温育苗适宜播种期研究%Optimal Sowing Period for Raising Tobacco Seedlings in Floating System with Temperature Increasing in Leiyang City

    Institute of Scientific and Technical Information of China (English)

    周孚美; 谷云松

    2012-01-01

    The raising method that using electro-warming device to increase water temperature of floating system was adapted to study influences of four different sowing periods on growth period and quality of tobacco seedling, agricultural characters of tobacco plant and yield and quality of tobacco leaves. The results showed that adapting floating system seedling raising method with temperature increasing during production in Leiyang city, the sowing period should be better at 22nd December last year, which 7 d advanced than floating system seedling raising method with normal temperature.%以云烟87为试验材料,采用电暖增温设备提高漂浮式水体温度的育苗方式(水体温度设置为18℃),研究了4个不同播种期对烟苗生育期、烟苗素质、大田烟株农艺性状及烟叶产质量的影响.结果表明:在耒阳市烤烟育苗生产中采用漂浮式水体增温育苗方式,播种期以上年12月22日左右播种较为适宜,比常温漂浮式育苗方式可提早7d左右.

  12. Day and Night Closed-Loop Control Using the Integrated Medtronic Hybrid Closed-Loop System in Type 1 Diabetes at Diabetes Camp.

    Science.gov (United States)

    Ly, Trang T; Roy, Anirban; Grosman, Benyamin; Shin, John; Campbell, Alex; Monirabbasi, Salman; Liang, Bradley; von Eyben, Rie; Shanmugham, Satya; Clinton, Paula; Buckingham, Bruce A

    2015-07-01

    To evaluate the feasibility and efficacy of a fully integrated hybrid closed-loop (HCL) system (Medtronic MiniMed Inc., Northridge, CA), in day and night closed-loop control in subjects with type 1 diabetes, both in an inpatient setting and during 6 days at diabetes camp. The Medtronic MiniMed HCL system consists of a fourth generation (4S) glucose sensor, a sensor transmitter, and an insulin pump using a modified proportional-integral-derivative (PID) insulin feedback algorithm with safety constraints. Eight subjects were studied over 48 h in an inpatient setting. This was followed by a study of 21 subjects for 6 days at diabetes camp, randomized to either the closed-loop control group using the HCL system or to the group using the Medtronic MiniMed 530G with threshold suspend (control group). The overall mean sensor glucose percent time in range 70-180 mg/dL was similar between the groups (73.1% vs. 69.9%, control vs. HCL, respectively) (P = 0.580). Meter glucose values between 70 and 180 mg/dL were also similar between the groups (73.6% vs. 63.2%, control vs. HCL, respectively) (P = 0.086). The mean absolute relative difference of the 4S sensor was 10.8 ± 10.2%, when compared with plasma glucose values in the inpatient setting, and 12.6 ± 11.0% compared with capillary Bayer CONTOUR NEXT LINK glucose meter values during 6 days at camp. In the first clinical study of this fully integrated system using an investigational PID algorithm, the system did not demonstrate improved glucose control compared with sensor-augmented pump therapy alone. The system demonstrated good connectivity and improved sensor performance. © 2015 by the American Diabetes Association. Readers may use this article as long as the work is properly cited, the use is educational and not for profit, and the work is not altered.

  13. Structural analysis of floating collar for gravity cage system in the open sea%重力式网箱浮架结构的动力响应特性研究

    Institute of Scientific and Technical Information of China (English)

    单恒年; 董国海; 许条建

    2015-01-01

    Fish culture in the offshore fish cage has been received more and more attention recently, while there are bad sea conditions in offshore areas, so the safety of floating collar is very important for the design of fish cage system. To study dynamic response of floating collar under the wave loading, the numerical model of floating collar was built based on finite element method using the PIPE element, and a series of physical model test were conducted to validate the numerical model, and the results showed that the calculated results agreed well with the test results. Then the numerical simulation was performed to analyze the effects of the number of clamps and the breakage of mooring line on the dynamic response of floating collar. Finally the stress and deformation value of the connection points and deformation models of the floating collar of floating collar were obtained. The results indicated that the numerical model could accurately simulate the deformation of floating collar and the mooring line tension force. In addition, the stress and deformation value of floating collar was decreased with the increase in the number of clamps, and the stress value and mooring line force were decreased significantly to minimum when two mooring lines on the same side break. In conclusion, dynamic response is an important basis for structure optimization and analysis, and floating collar with 24 clamps is recommended.%利用离岸网箱进行水产养殖近年来受到了越来越多的重视,离岸区域海况条件恶劣,浮架结构的安全性对于网箱的设计具有极其重要的意义。为研究网箱浮架结构在动态波浪荷载作用下的动力响应,采用有限元法利用PIPE单元建立了浮架的数值模型,并根据物理模型试验结果对该数值模型进行验证,发现有限元模型的计算结果与模型试验结果吻合较好。基于该模型,重点分析了网箱的连接构件数量和个别锚绳发生断裂对浮架动力响应的

  14. Landau-level mixing, floating-up extended states, and scaling behavior in a GaAs-based two-dimensional electron system containing self-assembled InAs dots

    Science.gov (United States)

    Liu, Chieh-Wen; Liu, Chieh-I.; Liang, C.-T.; Kim, Gil-Ho; Huang, C. F.; Hang, D. R.; Chang, Y. H.; Ritchie, D. A.

    2017-08-01

    Temperature-driven flow lines are studied in the conductivity plane in a GaAs-based two-dimensional electron system containing self-assembled InAs dots when Landau level filling factor ν = 2-4. In the insulator-quantum Hall (I-QH) transition resulting from the floating-up of the extended states, the flow diagram shows the critical behavior and we observed the expected semicircle in the strongest disorder case. By decreasing the effective disorder, we find that such flow lines can leave the I-QH regime and correspond to the plateau-plateau transition between ν = 4 and 2. The evolution of the conductivity curve at low magnetic fields demonstrates the importance of Landau-level mixing to the semicircle when the extended states float up.

  15. WindWaveFloat (WWF): Final Scientific Report

    Energy Technology Data Exchange (ETDEWEB)

    Weinstein, Alla; Roddier, Dominique; Banister, Kevin

    2012-03-30

    Principle Power Inc. and National Renewable Energy Lab (NREL) have completed a contract to assess the technical and economic feasibility of integrating wave energy converters into the WindFloat, resulting in a new concept called the WindWaveFloat (WWF). The concentration of several devices on one platform could offer a potential for both economic and operational advantages. Wind and wave energy converters can share the electrical cable and power transfer equipment to transport the electricity to shore. Access to multiple generation devices could be simplified, resulting in cost saving at the operational level. Overall capital costs may also be reduced, provided that the design of the foundation can be adapted to multiple devices with minimum modifications. Finally, the WindWaveFloat confers the ability to increase energy production from individual floating support structures, potentially leading to a reduction in levelized energy costs, an increase in the overall capacity factor, and greater stability of the electrical power delivered to the grid. The research conducted under this grant investigated the integration of several wave energy device types into the WindFloat platform. Several of the resulting system designs demonstrated technical feasibility, but the size and design constraints of the wave energy converters (technical and economic) make the WindWaveFloat concept economically unfeasible at this time. Not enough additional generation could be produced to make the additional expense associated with wave energy conversion integration into the WindFloat worthwhile.

  16. Considerations on the effects of tidal regimes in the movement of floating litter in an estuarine environment: Case study of the estuarine system of Santos-São Vicente, Brazil.

    Science.gov (United States)

    Fernandino, Gerson; Elliff, Carla Isobel; Frutuoso, Gabriela Amado; Silva, Eric Vinícius Nascimento Malaquias da; Gama, Guilherme Santiago; Sousa, João Henrique de Oliveira; Silva, Iracema Reimão

    2016-09-15

    Floating litter in the estuarine system of Santos-São Vicente is common and is part of day-to-day activities of various users of the area. The objective of the present study was to carry out a quali-quantitative evaluation of the occurrence of floating litter, to infer their sources, and to identify environmental factors that are likely to control occurrence and distribution, with particular emphasis on the effects of tidal regimes. Six sampling stations were selected along the aforementioned estuary and visited monthly between July 2010 and January 2012. Floating litter was counted from a fixed sampling station. Plastics prevailed (89.64%) and their main source was domestic activities (55.41%). More litter was found during ebb spring tides, with higher concentrations obeying confluence patterns of the estuary's channels. Results indicated that occurrence can be attributed to the deficiency in basic sewage system in the area and the deliberate disposal into the estuary by the local population.

  17. The Design of Drainage System for External Floating Roof Tank in International Stockpile Project%浅谈国际储备库浮顶排水系统的设计选用

    Institute of Scientific and Technical Information of China (English)

    谭可昕

    2012-01-01

    Large external floating roof storage tank is widely used in petroleum,chemical,civil construction,transportation,metallurgy,national defense and other important fields.Central drainage system is the main accessory for external floating roof tank,its analysis and comparison of structure and type are important for the tank design.The paper summarized the design of central drainage system for external floating roof tank in international stockpile project.%大型外浮顶储罐广泛应用于石油、化工、市政建设、交通、冶金、国防等领域。中央排水系统是外浮顶罐的主要附件,其结构类型的分析和比较是储罐设计中的重要问题。文章综述了在国内一国际储备库项目中,外浮顶罐中央排水系统的设计选用。

  18. The interaction of stars and magnetic field in the orientation system of night migrating birds. I. Autumn experiments with European Warblers (gen. Sylvia).

    Science.gov (United States)

    Wiltschko, W; Wiltschko, R

    1975-06-01

    In the autumn migration periods of 1971, 1972, and 1973 the orientation behavior in registration cages of Sylvia communis, S. borin and S. cantillans was analyzed to find out what relative importance the birds assign to information from the stars and from the magnetic field for direction finding. We obtained the following results: 1. Under clear sky in the local earth's magnetic field (Control) the warblers showed directional preferences that corresponded to their expected migratory direction based on ringing recoveries. 2. When magnetic north was turned by 120 degrees to ESE (Test), all three species preferred on clear nights their migratory direction according to the magnetic field, in spite of contradicting information from the stars. 3. In a partly compensated magnetic field, which could not be used for orientation any more, no significant directional preference could be observed, although the stars were visible. Dividing these data into two groups according to whether the birds had been tested in Control or Test previously, we found a tendency for the directions selected here to depend upon the north direction of the magnetic field during the bird's previous tests. From this and from the observation that the concentration of orientation behavior decreases in the absence of stars, we derive the following orientational model: The magnetic field provides the primary directional information for migrating birds. The stars do not contain directional information in themselves, but they can become secondary sources of orientation when information from the magnetic field has been transferred to them previously. The importance of this mechanism lies in making it easier for the birds to maintain their migratory direction. The ecological advantages of such a system are discussed and critically compared to the other models of star orientation.

  19. Effect of Sand and Perlite Mixture on Tobacco Seedlings with Float System%砂和珍珠岩混合无机基质在烤烟漂浮育苗的应用

    Institute of Scientific and Technical Information of China (English)

    布云虹; 胡小东; 王跃金; 邹阳; 陈岗; 耿少武; 柴云霞

    2015-01-01

    To explore the suitable substitutes for the conventional peat media in tobacco seedling float system. Seedling cultivation tests were conducted to select suitable inorganic media with different proportions of sand and perlite. The results showed that, the characteristics of the seedlings, including germination rate and seedling growth, were better than those from the conventional float system. No significant difference was observed on the overall quality of seedlings, such as water absorbency, seedling emergence, and seedling quality, between the new media of sand and perlite mixture and the conventional float system. Moreover, this method could reduce the production costs by 47% comparing with the conventional float system. The optimal proportion for sand: perlite was 20%-40%, 80%-60% by volume. The best sand: perlite ratio was 3:7. It can substitute the conventional peat media without changing the regular floating system.%为寻求可替代草炭、使用简便的烤烟育苗基质,采用不同配比的砂和珍珠岩混拌进行育苗试验。结果表明,适宜配比的砂和珍珠岩混合无机基质可满足烟苗出苗和生长发育的要求。适宜的混配比例(体积比)为砂20%~40%,珍珠岩80%~60%,最优组成是30%砂+70%珍珠岩,所培育的烟苗出苗率达95%以上,螺旋根发生率低于2%,成苗率大于93%,与对照无显著差异,壮苗率高于对照,育苗成本降低45.18%~47.50%,经济效益明显,可完全替代常规漂浮育苗的草炭基质。

  20. El sistema flotante como alternativa para la producción de plantines de Lisianthus (Eustoma grandiflorum L. The floating system as an alternative for the production of Lisianthus seedlings (Eustoma grandiflorum L.

    Directory of Open Access Journals (Sweden)

    L. A. Barbaro

    2009-12-01

    Full Text Available La producción de plantines de Lisianthus (Eustoma grandiflorum L. se realiza mediante semillas sembradas en bandejas multiceldas, con control de temperatura y humedad. En la Argentina la producción no suele ser eficiente, y se obtienen plantines desuniformes y de reducido desarrollo. Otra forma de producción es el sistema flotante, empleado en la producción de plantines de tabaco y especies hortícolas. Consiste en la utilización de bandejas de poliestireno, las cuales flotan sobre una pileta desde la siembra al transplante. En este trabajo se evaluó el sistema flotante como alternativa al sistema convencional para la producción de plantines de Lisianthus. Se realizaron ensayos en tres fechas y las variables evaluadas fueron porcentaje de germinación y plantines para transplante, peso fresco y seco de la parte aérea y radicular, número de pares de hojas y longitud del primer par de hojas verdaderas. Los porcentajes de germinación y plantines para transplante no se diferenciaron entre los sistemas, pero en las restantes variables los plantines del sistema flotante superaron a los del convencional. Se concluye que el sistema flotante es una alternativa mejor que el sistema convencional, y que los plantines de Lisianthus obtenidos son de mayor tamaño, calidad y homogeneidad en menor tiempo.The production of Lisianthus seedlings (Eustoma grandiflorum L. is carried out on plug trays under controlled temperature and humidity conditions. Seedling production in Argentina is not efficient, and the seedlings obtained are not uniform and have reduced development. Another seedling production method is the floating system, which is used in the production of tobacco and horticultural seedlings. This method consists in the utilization of polystyrene trays floating on water tanks from sowing to transplant. This work evaluated the floating system for Lisianthus seedling production as an alternative to the conventional way. Experiments were carried

  1. Apache Aviator Evaluation of Dual-Technology Night Vision Systems in Operation Iraqi Freedom (OIF) Urban Combat (Master’s Thesis)

    Science.gov (United States)

    2008-01-01

    symbology viewed through a monocle (beamsplitter) in daytime or symbology overlaying the FLIR video feed from the PNVS sensor (night or day, when...corrected vision (or absence of) and eye preference prior to initiation into right monocle IHADSS use. Time since last helmet fitting, IHADSS field of

  2. Floating Silicon Method

    Energy Technology Data Exchange (ETDEWEB)

    Kellerman, Peter

    2013-12-21

    The Floating Silicon Method (FSM) project at Applied Materials (formerly Varian Semiconductor Equipment Associates), has been funded, in part, by the DOE under a “Photovoltaic Supply Chain and Cross Cutting Technologies” grant (number DE-EE0000595) for the past four years. The original intent of the project was to develop the FSM process from concept to a commercially viable tool. This new manufacturing equipment would support the photovoltaic industry in following ways: eliminate kerf losses and the consumable costs associated with wafer sawing, allow optimal photovoltaic efficiency by producing high-quality silicon sheets, reduce the cost of assembling photovoltaic modules by creating large-area silicon cells which are free of micro-cracks, and would be a drop-in replacement in existing high efficiency cell production process thereby allowing rapid fan-out into the industry.

  3. Can Oil Float Completely Submerged in Water?

    CERN Document Server

    Nath, Saurabh; Chatterjee, Souvick

    2013-01-01

    Droplet formation in a system of two or more immiscible fluids is a celebrated topic of research in the fluid mechanics community. In this work, we propose an innovative phenomenon where oil when injected drop-wise into a pool of water moves towards the air-water interface where it floats in a fully submerged condition. The configuration, however, is not stable and a slight perturbation to the system causes the droplet to burst and float in partially submerged condition. The droplet contour is analyzed using edge detection. Temporal variation of a characteristic length of the droplet is analyzed using MATLAB image processing. The constraint of small Bond Number established the assumption of lubrication regime in the thin gap. A brief theoretical formulation also showed the temporal variation of the gap thickness

  4. Study of a Floated Pendulum Accelerometer with Passive Magnetic Suspension

    OpenAIRE

    TAKIZAWA, Minoru; OOTSUKI, Masao; Suzuki, Takao; 滝沢, 実; 大月, 正男; 鈴木,孝雄

    1980-01-01

    In the last few years, in order to develop more precise inertial sensors, such as floated gyros and floated accelerometers used in the inertial navigation system, a passive magnetic suspension with an eight-pole stator, that can be applied to support the output axes of the sensors, has been theoretically and experimentally studied at NAL (National Aerospace Laboratory). In our previous reports, 7)~10)29) a theoretical analysis and an experimental study of the magnetic suspension were describe...

  5. Traffic Light Detection at Night

    DEFF Research Database (Denmark)

    Jensen, Morten Bornø; Philipsen, Mark Philip; Bahnsen, Chris

    2015-01-01

    of three detectors based on heuristic models and one learning-based detector. Evaluation is done on night-time data from the public LISA Traffic Light Dataset. The learning-based detector out- performs the model-based detectors in both precision and recall. The learning-based detector achieves an average......Traffic light recognition (TLR) is an integral part of any in- telligent vehicle, it must function both at day and at night. However, the majority of TLR research is focused on day-time scenarios. In this paper we will focus on detection of traffic lights at night and evalu- ate the performance...

  6. Synthesizing Accurate Floating-Point Formulas

    OpenAIRE

    Ioualalen, Arnault; Martel, Matthieu

    2013-01-01

    International audience; Many critical embedded systems perform floating-point computations yet their accuracy is difficult to assert and strongly depends on how formulas are written in programs. In this article, we focus on the synthesis of accurate formulas mathematically equal to the original formulas occurring in source codes. In general, an expression may be rewritten in many ways. To avoid any combinatorial explosion, we use an intermediate representation, called APEG, enabling us to rep...

  7. Comparison of simulations and offshore measurement data of a prototype of a floating combined wind and wave energy conversion system

    DEFF Research Database (Denmark)

    Yde, Anders; Larsen, Torben J.; Hansen, Anders Melchior

    2015-01-01

    . The numerical model of the platform is based on the aeroelastic code, HAWC2, developed by DTU Wind Energy, which is coupled with a special external system that reads the output generated directly by the wave analysis software, WAMIT. The model also includes models for the dynamic mooring lines as well...... as the turbines non-linear yaw and teeter motion behavior. The main focus on the comparison will be on the statistical trends of the platform motion, mooring loads and turbine loads in measurements and simulations during different operational conditions such as increasing wind speed, wave height and wind...

  8. Effectiveness of Floating Micro-Bead Bio-Filter for Ornamental Fish in a Re-Circulating Aquaculture System

    OpenAIRE

    R Fadhil

    2011-01-01

    Bio-filtration has been widely used in re-circulating aquaculture system to remove waste and to convert toxic ammonia andnitrite into safe end products ornamental fish and other aquatic organisms. However, the study of micro-bead usage as the filter medium has not yet been broadened and thoroughly developed. Therefore, the aim of this study is to construct a biological filter made from polyethylene micro-bead as the filter medium and to analyze its effectiveness in removingwaste as well as in...

  9. The night before your surgery - children

    Science.gov (United States)

    Surgery - child; Preoperative - night before ... food after 11 p.m. the night before surgery. Your child should not eat or drink any ... child the night before or the day of surgery, call the doctor. Stop giving your child any ...

  10. Discover POPSCIENCE on Researchers' Night

    CERN Multimedia

    The POPSCIENCE Team

    2014-01-01

    On Friday 26 September 2014, CERN will be celebrating European Researchers' Night at three venues in Geneva and St. Genis-Pouilly. Inspired by Andy Warhol, this year's theme is “Pop science is for everyone”.     Every year, on the last Friday of September, the European Researchers’ Night takes place in about 300 cities all over Europe, with funding from the EU, to promote research and highlight researchers in engaging and fun ways for the general public. Andy Warhol said, “Pop art is for everyone”. This year, “Pop science is for everyone” is the motto of the Researchers’ Night event organised by CERN and its partners*. The night will offer everyone the opportunity to learn about the latest discoveries in physics and cosmology through poetry, theatre and music. This will be in addition to the event's traditional activities for the general public. To attract new audiences,...

  11. Discover POPSCIENCE on Researchers' Night

    CERN Multimedia

    The POPSCIENCE Team

    2014-01-01

    On Friday 26 September 2014, CERN will be celebrating European Researchers' Night at three venues in Geneva and St. Genis-Pouilly. Inspired by Andy Warhol, this year's theme is “Pop science is for everyone”.     Every year, on the last Friday of September, the European Researchers’ Night takes place in about 300 cities all over Europe, with funding from the EU, to promote research and highlight researchers in engaging and fun ways for the general public. Andy Warhol said, “Pop art is for everyone”. This year, “Pop science is for everyone” is the motto of the Researchers’ Night event organised by CERN and its partners*. The night will offer everyone the opportunity to learn about the latest discoveries in physics and cosmology through poetry, theatre and music. This will be in addition to the event's traditional activities for the general public. To attract new audiences,...

  12. High voltage switches having one or more floating conductor layers

    Energy Technology Data Exchange (ETDEWEB)

    Werne, Roger W.; Sampayan, Stephen; Harris, John Richardson

    2015-11-24

    This patent document discloses high voltage switches that include one or more electrically floating conductor layers that are isolated from one another in the dielectric medium between the top and bottom switch electrodes. The presence of the one or more electrically floating conductor layers between the top and bottom switch electrodes allow the dielectric medium between the top and bottom switch electrodes to exhibit a higher breakdown voltage than the breakdown voltage when the one or more electrically floating conductor layers are not present between the top and bottom switch electrodes. This increased breakdown voltage in the presence of one or more electrically floating conductor layers in a dielectric medium enables the switch to supply a higher voltage for various high voltage circuits and electric systems.

  13. Conceptualizing nurses' night work: an inductive content analysis.

    Science.gov (United States)

    West, Sandra; Rudge, Trudy; Mapedzahama, Virginia

    2016-08-01

    To develop a conceptual model of nurse-identified effects of night work. Studies designed to predict shift work tolerance are frequently unsuccessful in incorporating the intersections between physiological, psychological and social issues involved in such work. Where nurses have been the participants of such studies they have rarely been involved in ways that would allow their points of view to be heard directly. Consequently, the issues of personal importance to nurses as shift and night workers in 24/7 organizations are rarely identified in discussions about that work. Inductive qualitative content analysis. Survey responses were provided by 1355 night working RNs employed in a state/public health system in 2012. Data derived from open-ended questions about nurses' own perceptions of the advantages and disadvantages of night work are analysed here. Four main categories providing a descriptive summary of the major elements of nurses' night work were identified: 'Lives' and 'Bodies' of night working nurses, the 'Work' of nurses at night and the nurses' 'Workplace' at night. The work nurses undertake at night, and the demanding organizational and clinical environments where they do this are uniquely related to the time of day that this work occurs. The Nurses' Night Work model deconstructs the established binary considerations of the lives and bodies of workers to permit a 24/7-based consideration of nurses' night work and its frequently unacknowledged relationship with the day work required of the same nurses when working a rapidly but randomly rotating shift work schedule. © 2016 John Wiley & Sons Ltd.

  14. NULL Convention Floating Point Multiplier

    Directory of Open Access Journals (Sweden)

    Anitha Juliette Albert

    2015-01-01

    Full Text Available Floating point multiplication is a critical part in high dynamic range and computational intensive digital signal processing applications which require high precision and low power. This paper presents the design of an IEEE 754 single precision floating point multiplier using asynchronous NULL convention logic paradigm. Rounding has not been implemented to suit high precision applications. The novelty of the research is that it is the first ever NULL convention logic multiplier, designed to perform floating point multiplication. The proposed multiplier offers substantial decrease in power consumption when compared with its synchronous version. Performance attributes of the NULL convention logic floating point multiplier, obtained from Xilinx simulation and Cadence, are compared with its equivalent synchronous implementation.

  15. NULL convention floating point multiplier.

    Science.gov (United States)

    Albert, Anitha Juliette; Ramachandran, Seshasayanan

    2015-01-01

    Floating point multiplication is a critical part in high dynamic range and computational intensive digital signal processing applications which require high precision and low power. This paper presents the design of an IEEE 754 single precision floating point multiplier using asynchronous NULL convention logic paradigm. Rounding has not been implemented to suit high precision applications. The novelty of the research is that it is the first ever NULL convention logic multiplier, designed to perform floating point multiplication. The proposed multiplier offers substantial decrease in power consumption when compared with its synchronous version. Performance attributes of the NULL convention logic floating point multiplier, obtained from Xilinx simulation and Cadence, are compared with its equivalent synchronous implementation.

  16. Electrically floating, near vertical incidence, skywave antenna

    Science.gov (United States)

    Anderson, Allen A.; Kaser, Timothy G.; Tremblay, Paul A.; Mays, Belva L.

    2014-07-08

    An Electrically Floating, Near Vertical Incidence, Skywave (NVIS) Antenna comprising an antenna element, a floating ground element, and a grounding element. At least part of said floating ground element is positioned between said antenna element and said grounding element. The antenna is separated from the floating ground element and the grounding element by one or more electrical insulators. The floating ground element is separated from said antenna and said grounding element by one or more electrical insulators.

  17. Some thoughts on the implementation of pilot night vision devices for helicopters

    Science.gov (United States)

    Tucker, G. E.

    1984-01-01

    Night vision enhancement devices greatly expand the range and quality of services by extending night operational capabilities. Evolving military tactical concepts for helicopters survivability and battlefield effectiveness necessitate nap-of-the-earth (NOE) flying under both day and night conditions. From a pilot workload standpoint, flying a helicopter NOE in day VFR conditions with minimum clearance between rotors and obstacles is quite demanding. Doing the same job at night is several times more difficult. There are two general categories of night vision devices in operation in helicopter aviation: the Night Vision Goggles (NVG) and forward looking infrared (FLIR) system. The capabilities and limitations of those two devices are discussed.

  18. A multiple floating point coprocessor architecture

    Energy Technology Data Exchange (ETDEWEB)

    Rauchwerger, L.; Farmwald, M.P. (Center for Supercomputing Research and Development, Univ. of Illinois at Urbana-Champaign, 305 Talbot Lab., Urbana, IL (US))

    1990-06-01

    General purpose microprocessor based computers usually speed their arithmetic processing performance by using a floating point co-processor. Because adding more co-processors represents neither a technological nor a cost problem the authors investigated a system based on a MIPS R2000 (2) and 4 floating point units. In this paper they show a block diagram of such an implementation and how two important scientific operations can be accelerated using a single unmodified data bus. A large percentage of the engineering applications are solved with the help of linear algebra methods like BLAS3 (4) algorithms; it is precisely for these primitives that the proposed architecture brings significant performance gains. The first operation described is a matrix multiplication algorithm, its timing diagram and some results. Next a polynomial evaluation technique is examined. The authors show how to use the same ideas with various other microprocessors.

  19. Capillary deposition of advected floating particles

    Science.gov (United States)

    Dressaire, Emilie; Debaisieux, Aymeric; Gregori, Federico

    2016-11-01

    The deposition and aggregation of particles flowing through a confined environment can dramatically hinder the transport of suspensions. Yet, the mechanisms responsible for the deposition of particles in shear flow are not fully understood. Here, we use an experimental model system in which floating particles are advected on the surface of a water channel and deposited on fixed obstacles through attractive capillary effects. By varying the flow rate of the liquid, the wetting properties and size of the particles and obstacles, we can tune the magnitude of the capillary and hydrodynamic forces that determine the probability of deposition and the equilibrium position on the substrate. We show that arrays of obstacles can be designed to efficiently capture the floating particles advected by the flow.

  20. FORMULATION AND EVALUATION OF GASTRO RETENTIVE FLOATING TABLETS OF GLICLAZIDE

    Directory of Open Access Journals (Sweden)

    Thakkar Hardik Kumar Rajeshbhai

    2011-04-01

    Full Text Available A gastro retentive floating drug delivery system containing gliclazide was prepared in the form of tablet and evaluated for its processing parameters and in vitro release behaviour. Gliclazide is a selective second-generation sulphonyl urea used in treatment of hyperglycemia and it absorbs rapidly and completely. However its absorption is erratic in diabetic patient due to its impaired gastric motility or gastric emptying. To overcome these drawbacks, the present investigation was to develop a gastro retentive floating tablets of gliclazide. Ten formulations containing retardant materials such as hydroxypropylmethylcellulose K4M and K15M, sodium bicarbonate was used as a gas generating agent to reduce floating lag time and other release promoters. Tablets remained buoyant over 12 hours in the release medium, and the amount of sodium bicarbonate found to be significant for not only to remaining buoyant without causing disintegration of the tablet, but also to release of the drug in the acidic medium. Final F6 optimized formulation released approximately 99% drug in 12 hours in vitro, while the floating lag time was 39 sec and tablet remained floatable throughout all studies. In vitro gastro retentive study of tablets gave successful results by floating in gastric content over a period of 24 hours. The results of the current study clearly indicate, a promising potential of the gliclazide floating system as an alternative to the conventional dosage form.

  1. NULL Convention Floating Point Multiplier

    OpenAIRE

    Anitha Juliette Albert; Seshasayanan Ramachandran

    2015-01-01

    Floating point multiplication is a critical part in high dynamic range and computational intensive digital signal processing applications which require high precision and low power. This paper presents the design of an IEEE 754 single precision floating point multiplier using asynchronous NULL convention logic paradigm. Rounding has not been implemented to suit high precision applications. The novelty of the research is that it is the first ever NULL convention logic multiplier, designed to p...

  2. Large floating structures technological advances

    CERN Document Server

    Wang, BT

    2015-01-01

    This book surveys key projects that have seen the construction of large floating structures or have attained detailed conceptual designs. This compilation of key floating structures in a single volume captures the innovative features that mark the technological advances made in this field of engineering, and will provide a useful reference for ideas, analysis, design, and construction of these unique and emerging urban projects to offshore and marine engineers, urban planners, architects and students.

  3. 甘薯藤蔓漂浮育苗快繁技术研究初报%Prime report on rapid propagation technique for sweet potato seedlings using floating culture system

    Institute of Scientific and Technical Information of China (English)

    李明福

    2011-01-01

    [目的]探索优质、快速的甘薯育苗新方法,为甘薯种苗快速繁殖提供科学依据.[方法]采用漂浮育苗、固体基质育苗和土床育苗方法,观察3种育苗方式下薯苗的生长、发苗天数等相关生物学性状,并记载甘薯茎蔓的腋芽发生、叶数、苗高生长及发根情况.[结果]漂浮育苗处理甘薯茎蔓发苗时间最快(6d),成活率最高(85.0%),育苗发根数最多(9.7根),根长最长(6.2cm).[结论]甘薯茎蔓漂浮育苗具有发苗时间较快、管理成本低、薯苗壮实等特点,1个月内可达到成苗标准,在甘薯薯苗快繁中有较大的优势,值得推广应用.%[Objective]The objective of the current study was to develop a fast method for production of high quality sweet potato seedlings, and to provide scientific basis for its rapid propagation. [Method]Biological characteristics of sweet potato seedling were investigated using three different seedling cultivation methods, viz. ,floating culture system ,solid substrate culture system and soil-bed culture system. The status of growth and development of hairy.root in axillary buds of sweet potato stem were recorded. [ Result ]Culturing sweet potatoes in floating culture system showed the lowest time of sprouting (6 d), the highest survival rate (85.0%) and root number (9.7 roots), and the longest root length (6.2 cm),compared to the other systems. [Conclusion]Culturing sweet potato seedlings in floating culture system decreased sprouting time, improved the growth of seedlings and reduced the cost of management. Further, by using this technique, plantlets can be produced in one month only, which is advantageous for rapid propagation of sweet potato seedling. Floating culture system due to its time and cost saving characteristics is worth for popularization in sweet potato seedling productions.

  4. 北京市流动人口服务管理史略(1978-2008)%A Brief History of Floating Population Regulation System in Beijing(1978-2008)

    Institute of Scientific and Technical Information of China (English)

    张真理

    2009-01-01

    自改革开放以后,北京市流动人口服务管理可以分为严格户籍管理阶段、暂住证管理阶段、系统证件管理阶段、调整转型阶段.这四个阶段前后更迭,其政策指向、工作内容、价值目标逐渐变迁.目前,北京市流动人口服务管理已经成为社会建设的重要内容,逐步适应新时期下首都人口、经济社会、资源环境协调发展的要求.%Since the Reform and Opening up,floating population regulation system in Beijing can be divided four stage: serious household register system stage, temporary residence certificate system stage, synthesized certificate system stage and reformation stage. The four sequential stage have differences in policy goal, working content and value system. At the present time, floating population regulation system in Beijing ,which has been become an important aspect of socialist construction, gradually adapts to the harmonious development of population in Beijing, economy, society, resources and environment.

  5. The Stability Evaluation Research of Many Floating Structures at Spread Mooring System%多锚链系泊浮体的稳定性评估

    Institute of Scientific and Technical Information of China (English)

    缪馥星; 杨黎明; 董新龙

    2012-01-01

    In this paper, based on the catenary equation of a single chain, quasi static governing equation of Multi Chain mooring floating body or a ship are established. The relationship between multiple anchor floating drift rate and horizontal mooring force are given in the known environmental load. The calculation results can be used the theory reference to design collision avoidance of offshore facilities.%基于单根锚链的悬链线方程,建立整体作用下的叠加型多锚链系泊浮体的准静态控制方程,给出了一定环境载荷作用下,多锚链浮体的漂移量与水平系泊力间的关系.计算结果对海上防撞设施的设计提供理论参考.

  6. Night Rover Challenge Project

    Data.gov (United States)

    National Aeronautics and Space Administration — Solar energy is a renewable source that would be available on the Moon and at other destinations in space. To enable practical system demonstrations of diverse...

  7. Technology Development and Circuit Design for a Parallel Laser Programmable Floating Point Application Specific Processor

    Science.gov (United States)

    1989-12-01

    The laser programmable floating point application specific processor (LPASP) is a new approach at rapid development of custom VLSI chips. The LPASP...double precision floating point adder and the laser programmable read-only memory (LPROM) that are macrocells within the LPASP. In addition, the...thesis analyzes the applicability of an LPASP parallel processing system. The double precision floating point adder is an adder/subtractor macrocell

  8. Design of a Floating-Point Fused Add-Subtract Unit Using Verilog

    Directory of Open Access Journals (Sweden)

    Mayank Sharma,

    2013-06-01

    Full Text Available A floating-point (FP fused add-subtract unit is presented that performs simultaneous floating-point operation of add-subtract on a common pair of single-precision data at the same time that it takes to perform in a single addition with a conventional floating-point adder. The system was placed and routed in 45nm process so that there will be less consumption of memory as well as power.

  9. Microprocessor-based data acquisition system incorporating a floating-point arithmetic unit for complex mathematical computations. [To determine thickness of conductors on printed wiring boards from measured resistance by use of curve-fitting equations

    Energy Technology Data Exchange (ETDEWEB)

    Hopwood, J.

    1978-02-01

    A microprocessor-based, stored-program controller which incorporates a floating-point arithmetic unit to perform complex mathematical computations was developed to determine the thickness of conductors on printed wiring boards. Conductor thickness is calculated from measured resistance by means of curve-fitting equations in the stored program. Called a film thickness calculator, the instrument demonstrates a method which may serve as a basis for other designs involving microprocessor-based data acquisition systems requiring low-speed calculations. 19 figures.

  10. Aiming at the development of the floating type-wide and wave power generation system(schematic design); Futaishiki {center_dot} fuharyoku hattsuden shisutemu no kaihatsu ni mukete(kihon koso)

    Energy Technology Data Exchange (ETDEWEB)

    Shimada, B. [Freelance Journalist, Tokyo (Japan); Nakata, Y. [Fujita Corp., Tokyo (Japan). Technology Development Div.

    1999-11-25

    Recently, the world has been faced to the global environmental problem of global warming. As a result, the wind force and the wave energy come to be highlighted again as energy resources which do not exhaust carbon dioxide (CO{sub 2}). Under such a background, we report on the development plan of floating body type wind force and wave activated power generation system which produces clean energy and the tranquil waters for the coast sea (about 34,000 km of Japan in the total extension of coast lines) where a steady strong wind and the wave are obtained easily. (author)

  11. A night with good vibrations

    CERN Multimedia

    2002-01-01

    For its third edition, the Museum d'histoire des sciences invites you to a Science Night under the banner of waves and undulations. Scientists, artists and storytellers from more than forty institutes and local or regional associations will show in only one weekend that waves and undulations form an integral part of our daily environment. Telephones, televisions, radios, irons, lighting, music, sun rays, stars, rainbows, earthquakes and other natural phenomena - all produce, emit or receive waves or undulations. The visitors attending the Night will be able to get in contact with the nature of waves through interactive exhibitions on sound and light and through hands-on demonstrations arranged around the Bartholoni villa and in the Park of the Perle du lac. An amusing and distracting way to familiarize yourself with the concepts of wavelength, frequency and interference lengths... In addition to the stands, the Night will offer many other activities: reconstructions of critical experiments, scientific consu...

  12. A night with good vibrations

    CERN Document Server

    2002-01-01

    Next week-end, the Geneva Science History Museum invites you to a Science Night under the banner of waves and vibrations. Scientists, artists and storytellers from more than forty institutes and local or regional associations will show that waves and vibrations form an integral part of our environment. You will be able to get in contact with the nature of waves through interactive exhibitions on sound and light and through hands-on demonstrations arranged in the Park of the Perle du Lac. On the CERN stand, you will be able to measure the speed of light with a bar of chocolate, and understand the scattering of waves with plastic ducks. Amazing, no? In addition to the stands, the Night will offer many other activities: reconstructions of experiments, a play, a concert of crystal glasses, an illuminated fountain, a house of spirits. More information Science Night, 6 and 7 July, Park of the Perle du Lac, Geneva

  13. Artisanal fishing net float loss and a proposal for a float design solution

    Directory of Open Access Journals (Sweden)

    Paulo de Tarso Chaves

    2016-03-01

    Full Text Available Abstract Plastic floats from fishing nets are commonly found washed up on beaches in southern Brazil. They are usually broken and show signs of having been repaired. Characteristics of floats and interviews with fishermen suggest two main causes of float loss. First, collisions between active gear, bottom trawl nets for shrimp, and passive gear, drift nets for fish, destroy nets and release fragments of them, including floats. Second, the difficulty with which floats are inserted on the float rope of the nets when they are used near the surface. Floats are inserted to replace damaged or lost floats, or they may be removed if it is desired that the nets be used in deeper waters. Floats may thus be poorly fixed to the cables and lost. Here a new float design that offers greater safety in use and for the replacement of floats is described and tested.

  14. Night blindness and ancient remedy

    Directory of Open Access Journals (Sweden)

    H.A. Hajar Al Binali

    2014-01-01

    Full Text Available The aim of this article is to briefly review the history of night blindness and its treatment from ancient times until the present. The old Egyptians, the Babylonians, the Greeks and the Arabs used animal liver for treatment and successfully cured the disease. The author had the opportunity to observe the application of the old remedy to a patient. Now we know what the ancients did not know, that night blindness is caused by Vitamin A deficiency and the animal liver is the store house for Vitamin A.

  15. All Sky Camera instrument for night sky monitoring

    CERN Document Server

    Mandat, Dusan; Hrabovsky, Miroslav; Schovanek, Petr; Palatka, Miroslav; Travnicek, Petr; Prouza, Michael; Ebr, Jan

    2014-01-01

    The All Sky Camera (ASC) was developed as an universal device for a monitoring of the night sky quality and night sky background measurement. ASC system consists of an astronomical CCD camera, a fish eye lens, a control computer and associated electronics. The measurement is carried out during astronomical twilight. The analysis results are the cloud fraction (the percentage of the sky covered by clouds), night sky brightness (in mag/arcsec2) and light background in the field of view of the camera. The analysis of the cloud fraction is based on the astrometry (comparison to catalogue positions) of the observed stars.

  16. Floating point only SIMD instruction set architecture including compare, select, Boolean, and alignment operations

    Science.gov (United States)

    Gschwind, Michael K.

    2011-03-01

    Mechanisms for implementing a floating point only single instruction multiple data instruction set architecture are provided. A processor is provided that comprises an issue unit, an execution unit coupled to the issue unit, and a vector register file coupled to the execution unit. The execution unit has logic that implements a floating point (FP) only single instruction multiple data (SIMD) instruction set architecture (ISA). The floating point vector registers of the vector register file store both scalar and floating point values as vectors having a plurality of vector elements. The processor may be part of a data processing system.

  17. Formulation and in-vitro evaluation of floating bilayer tablet of lisinopril maleate and metoprolol tartrate.

    Science.gov (United States)

    Ijaz, Hira; Qureshi, Junaid; Danish, Zeeshan; Zaman, Muhammad; Abdel-Daim, Mohamed; Hanif, Muhammad; Waheed, Imran; Mohammad, Imran Shair

    2015-11-01

    The purpose of this study was to introduce the technology for the development of rate-controlled oral drug delivery system to overcome various physiological problems. Several approaches are being used for the purpose of increasing the gastric retentive time, including floating drug delivery system. Gastric floating lisinopril maleate and metoprolol tartrate bilayer tablets were formulated by direct compression method using the sodium starch glycolate, crosscarmellose sodium for IR layer. Eudragit L100, pectin, acacia as sustained release polymers in different ratios for SR metoprolol tartrate layer and sodium bicarbonate, citric acid as gas generating agents for the floating extended release layer. The floating bilayer tablets of lisinopril maleate and metoprolol tartrate were designed to overcome the various problems associated with conventional oral dosage form. Floating tablets were evaluated for floating lag time, drug contents and in-vitro dissolution profile and different kinetic release models were applied. It was clear that the different ratios of polymers affected the drug release and floating time. L2 and M4 showed good drug release profile and floating behavior. The linear regression and model fitting showed that all formulation followed Higuchi model of drug release model except M4 that followed zero order kinetic. From the study it is evident that a promising controlled release by floating bilyer tablets of lisinopril maleate and metoprolol tartrate can be developed successfully.

  18. Floating Oil-Spill Containment Device

    Science.gov (United States)

    Jones, Jack A.

    2012-01-01

    Previous oil containment booms have an open top that allows natural gas to escape, and have significant oil leakage due to wave action. Also, a subsea pyramid oil trap exists, but cannot move relative to moving oil plumes from deepsea oil leaks. The solution is to have large, moveable oil traps. One version floats on the sea surface and has a flexible tarp cover and a lower weighted skirt to completely entrap the floating oil and natural gas. The device must have at least three sides with boats pulling at each apex, and sonar or other system to track the slowly moving oil plume, so that the boats can properly locate the booms. The oil trap device must also have a means for removal of the oil and the natural gas. A second design version has a flexible pyramid cover that is attached by lines to ballast on the ocean floor. This is similar to fixed, metal pyramid oil capture devices in the Santa Barbara Channel off the coast of California. The ballast lines for the improved design, however, would have winches that can move the pyramid to always be located above the oil and gas plume. A third design is a combination of the first two. It uses a submerged pyramid to trap oil, but has no anchor and uses boats to locate the trap. It has ballast weights located along the bottom of the tarp and/or at the corners of the trap. The improved floating oil-spill containment device has a large floating boom and weighted skirt surrounding the oil and gas entrapment area. The device is triangular (or more than three sides) and has a flexible tarp cover with a raised gas vent area. Boats pull on the apex of the triangles to maintain tension and to allow the device to move to optimum locations to trap oil and gas. The gas is retrieved from a higher buoyant part of the tarp, and oil is retrieved from the floating oil layer contained in the device. These devices can be operated in relatively severe weather, since waves will break over the devices without causing oil leaking. Also, natural

  19. Simulation of vibration control based on the multi-channel self-adaptive feed forward law for the floating raft system with AVAs%带主动动力吸振器的浮筏隔振系统自适应控制仿真分析

    Institute of Scientific and Technical Information of China (English)

    敬刘凯; 吴文伟; 翁震平

    2014-01-01

    文章针对浮筏隔振系统低频线谱噪声,设计了基于x-LMS算法的自适应前馈控制律的主动吸振控制方案,采用导纳综合方法仿真分析了浮筏隔振系统在多通道主动动力吸振装置作用下的振动控制效果。仿真结果表明,带主动动力吸振器的浮筏隔振系统对低频线谱振动有着较好的控制效果。%To improve the isolation performance of the conventional floating raft system, active dynamic vi-bration absorbers (AVAs) were applied, and an evaluation function about reducing the sum of mean square error of vibration response of four observation points which were located on the flexible foundation of float-ing raft system with AVAs was formatted. With this objective function and based on filtered x-LMS algo-rithm, the multi-channel self-adaptive feed forward law for the floating raft system with AVAs was designed and simulated. The simulation result shows that it is effective to use the floating raft system with AVAs for reducing the vibration of mechanical device at low frequency.

  20. Volunteers for Researchers’ Night wanted

    CERN Multimedia

    Katarina Anthony

    2015-01-01

    Every year, on the last Friday of September, the European Researchers’ Night (see here) takes place in about 300 cities all over Europe - promoting research in engaging and fun ways for the general public. This year, CERN will be participating once again, hosting dozens of events across the Balexert shopping centre – and we’ll need YOUR help to make the celebration a success.   From film screenings and celebrity Q&A sessions to “Ask a Researcher” and build-your-own LEGO LHC events, this year’s Researchers’ Night is going to be jam-packed! The fun will kick off prior to the night itself with a mock-up of the LHC tunnel installed in the central court of the Balexert shopping centre, 8-12 September*. CERN people will be on hand to speak to shoppers about the LHC, and to encourage them to participate in Researchers’ Night! The CERN organisers are recruiting volunteers and support staff for Researchers’ ...

  1. Progress in color night vision

    NARCIS (Netherlands)

    Toet, A.; Hogervorst, M.A.

    2012-01-01

    We present an overview of our recent progress and the current state-of-the-art techniques of color image fusion for night vision applications. Inspired by previously developed color opponent fusing schemes, we initially developed a simple pixel-based false color-mapping scheme that yielded fused

  2. Night Operations - The Soviet Approach

    Science.gov (United States)

    1978-06-09

    Battle of Berlin reveal the purpose for the night tactic of il- * ilumination : surprise and psychological impact, both on the enemy and friendly forces. An...attack Ilumination by shell Tn in k* Illumination by flare a Tank In firing position Observation post Antitank missle in firing position APC C3 APC

  3. Progress in color night vision

    NARCIS (Netherlands)

    Toet, A.; Hogervorst, M.A.

    2012-01-01

    We present an overview of our recent progress and the current state-of-the-art techniques of color image fusion for night vision applications. Inspired by previously developed color opponent fusing schemes, we initially developed a simple pixel-based false color-mapping scheme that yielded fused fal

  4. Progress in color night vision

    NARCIS (Netherlands)

    Toet, A.; Hogervorst, M.A.

    2012-01-01

    We present an overview of our recent progress and the current state-of-the-art techniques of color image fusion for night vision applications. Inspired by previously developed color opponent fusing schemes, we initially developed a simple pixel-based false color-mapping scheme that yielded fused fal

  5. Shedding Light on Night Learning.

    Science.gov (United States)

    Horwood, Bert

    1986-01-01

    Shows how darkness and night provide a potentially excellent arena for experiential learning opportunities. Recommends learning must be gradual, beginning with appreciation and allaying fear of the dark. Suggests sensory activities, hikes, games, aquatic activities, ecological simulations, historical presentations, and writing or reciting poetry.…

  6. Night blindness and Crohn's disease.

    Science.gov (United States)

    da Rocha Lima, Breno; Pichi, Francesco; Lowder, Careen Y

    2014-10-01

    Signs of malnutrition are common clinical features in Crohn's disease; and bowel resection, commonly needed in these cases, can aggravate malnutrition. These patients are at risk of developing vitamin A deficiency, which can lead to night blindness. We present a 60-year-old male, with history of Crohn's disease and multiple resections for strictures and fistulas leading to short bowel syndrome, with progressive bilateral loss of night vision (nyctalopia). Serum vitamin A level was markedly depleted (11 µg/dL, reference 20-120 µg/dL), and full-field electroretinogram testing demonstrated extinguished scotopic (rod function) responses and decreased amplitudes of photopic responses on 30 Hz flicker (cone function). He was started on vitamin A supplementation (initially intramuscular). His vitamin A level was back to normal (78 µg/dL), and night vision problems subjectively improved. Patients with Crohn's disease should be inquired about night vision problems. The presence of nyctalopia should prompt vitamin A level measurement and ophthalmology referral for further evaluation.

  7. Optimal Selection of Floating Platform for Tidal Current Power Station

    Directory of Open Access Journals (Sweden)

    Fengmei Jing

    2013-06-01

    Full Text Available With continuous development of marine engineering, more and more new structures are used in the exploring of tidal current energy. Three are there different kinds of support structures for tidal current power station, which are sea-bed mounted/gravity based system, pile mounted system and floating moored platform. Comparison with them, the floating mooring system is suit for deep water and the application of which will be widely. In this study, catamaran and semi-submersible as floating platform of tidal current power station are studied. And they are compared with its economic, efficiency of turbine and stability of station. It is found that the catamaran is optimal choice. Based on basic ship theory and using software MOSES, the stability of Catamaran tidal current power station is also calculated. The research of this study is significant and it will be as the reference for the future study.

  8. Analog floating-point BiCMOS sampling chip and architecture of the BaBar CsI calorimeter front-end electronics system at the SLAC B-Factory

    Energy Technology Data Exchange (ETDEWEB)

    Haller, G.M.; Freytag, D.R. [Stanford Univ., CA (United States). Stanford Linear Accelerator Center

    1996-06-01

    The design and implementation of an analog floating-point sampling integrated circuit for the BaBar detector at the SLAC B-Factory is described. The CARE (Custom Auto-Range Encoding) circuit is part of an 18-bit dynamic range sampling system with a 4-MHz waveform digitization rate for the CsI calorimeter. The architecture and methodology of the system are described. The CARE integrated circuit receives dual-range (gain of 1 and 32) 13-bit signals from the 18-bit range preamplifiers mounted directly on the CsI crystals and converts the input at a rate of 4 MHz to an auto-range floating-point format with a 10-bit analog mantissa and 2 digital range bits (for 4 ranges). Additional functions integrated on the chip are averaging and selection circuitry for signals originating from two independent diodes per crystal and range-selection overwrite circuitry. The circuit will be mounted within the detector structure and thus low power dissipation is essential. The circuit has been fabricated in a 1.2 {micro}m BiCMOS process with polysilicon-to-polysilicon capacitors and polysilicon resistors. Measurement results are presented. One complete CARE channel dissipates 25 mW.

  9. Control implementation for the SPUR floating point coprocessor

    Energy Technology Data Exchange (ETDEWEB)

    Jensen, D.

    1987-01-01

    SPUR is a RISC-based multiprocessor workstation being designed to facilitate parallel-processing research. Typically, RISC architectures achieve low performance levels for floating-point intensive applications, as the multiple-cycle floating-point instructions are not implemented in the hardware. In an attempt to raise these performance levels, the SPUR system provides floating-point support through an extended instruction set and tightly-coupled floating-point coprocessor. This report documents the implementation of the control unit for this floating-point coprocessor; describing the coprocessor interface, control PLA definitions, the finite state machine, the dynamic cycle counter, the 4-stage load-store pipeline, and the random logic generated to drive the datapath modules. Implementation techniques and trade-offs are discussed; including design strategy, area and speed optimization, noise margin considerations, and delay balancing rf the datapath control signals for clock skew minimization. Finally, in an attempt to raise these performance levels, the SPUR system The chip is implemented in 2-layer-metal 2..mu..m CMOS technology, and uses a four-phase non-overlapping clock with a target cycle time of approximately 100ns - 140 ns.

  10. Dynamic modeling of flexible spacecraft based on floating centroid system%挠性航天器浮动质心动力学建模

    Institute of Scientific and Technical Information of China (English)

    杨一岱; 荆武兴; 刘玥

    2015-01-01

    为提高挠性卫星的姿轨耦合控制精度,针对挠性卫星的姿态动力学建模问题展开研究。采用有限元与牛顿力学相结合的方法,提出一套体现卫星真实质心的浮动运动的浮动质心模型及建立在卫星浮动质心上的高精度动力学模型。利用此模型描述挠性卫星的姿态运动状态,能够准确反映出卫星的姿态运动与轨道运动之间的耦合关系以及卫星附件的挠性振动对卫星质心位置、速度的影响,进而准确估计出在挠性卫星有姿态机动的情况下各动力学要素与动态性能指标受挠性振动的影响,为提高卫星控制精度提供依据。通过仿真计算可知,应用该模型对卫星姿态机动过程进行动力学仿真所得到的结果符合实际工程约束,具有良好的可行性。%In order to improve the accuracy of the attitude⁃orbit coupling control problem of spacecraft with flexible attachments, a study on dynamic modeling of flexible spacecraft is conducted. As a result, a high⁃precision dynamic model based on the floating centroid frame system( FCFS) which can describe the attitude movement of spacecraft as well as the coupling relationship between the attitude maneuvering and the orbit movement better than the old ones is proposed by using the method of Finite⁃element along with Newton mechanics.The simulation result demonstrates that the FCFS model fits the practical restraint well and thus is applicable. The dynamic influence on the spacecraft caused by the vibration of the flexible attachments during the attitude maneuvering procedure can be calculated accurately by using the FCFS model and so is the changing of dynamic factors, such as the the velocity and the displacement of the centroid.The research results can provide theoretical basis for attitude⁃orbit coupling control problem of flexible spacecraft and thus achieve the purpose of improving control accuracy.

  11. The validity of the PAM-RL device for evaluating periodic limb movements in sleep and an investigation on night-to-night variability of periodic limb movements during sleep in patients with restless legs syndrome or periodic limb movement disorder using this system.

    Science.gov (United States)

    Kobayashi, Mina; Namba, Kazuyoshi; Ito, Eiki; Nishida, Shingo; Nakamura, Masaki; Ueki, Yoichiro; Furudate, Naomichi; Kagimura, Tatsuo; Usui, Akira; Inoue, Yuichi

    2014-01-01

    The status of night-to-night variability for periodic limb movements in sleep (PLMS) has not been clarified. With this in mind, we investigated the validity of PLMS measurement by actigraphy with the PAM-RL device in Japanese patients with suspected restless legs syndrome (RLS) or periodic limb movement disorder (PLMD) and the night-to-night variability of PLMS among the subjects. Forty-one subjects (mean age, 52.1±16.1 years) underwent polysomnography (PSG) and PAM-RL measurement simultaneously. Thereafter, subjects used the PAM-RL at home on four more consecutive nights. The correlation between PLMS index on PSG (PLMSI-PSG) and PLM index on PAM-RL (PLMI-PAM) was 0.781 (P<.001). When the PLMSI cutoff value on PSG was set at 15 episodes per hour, the cutoff value for predicting this PLMSI level was 16.0 episodes per hour. When the condition was set to the level in which the mean interclass correlation coefficient reached ≥0.9, the number of required nights for repeated measurements was 26 nights for subjects with PLMI of <15 episodes per hour and three nights for those with PLMI ≥15 episodes per hour on PAM-RL. PAM-RL is thought to be valuable for assessing PLMS even in Japanese subjects. Recording of PAM-RL for three or more consecutive nights may be required to ensure the screening reliability of a patient with suspected pathologically frequent PLMS. Copyright © 2013 Elsevier B.V. All rights reserved.

  12. Emulation of floating memcapacitors and meminductors using current conveyors

    OpenAIRE

    Pershin, Yuriy V.; Di Ventra, Massimiliano

    2010-01-01

    We suggest circuit realizations of emulators transforming memristive devices into effective floating memcapacitive and meminductive systems. The emulator's circuits are based on second generation current conveyors and involve either four single-output or two dual-output current conveyors. The equations governing the resulting memcapactive and meminductive systems are presented.

  13. Emulation of floating memcapacitors and meminductors using current conveyors

    CERN Document Server

    Pershin, Yuriy V

    2010-01-01

    We suggest circuit realizations of emulators transforming memristive devices into effective floating memcapacitive and meminductive systems. The emulator's circuits are based on second generation current conveyors and involve either four single-output or two dual-output current conveyors. The equations governing the resulting memcapactive and meminductive systems are presented.

  14. A Coupled Analysis of the Carrier Mooring System of the Floating Marine Device Based on the AQWA%基于AQWA 的漂浮式海洋装置载体锚泊系统耦合分析

    Institute of Scientific and Technical Information of China (English)

    王世明; 邹伟

    2016-01-01

    Based on the kinetic theory of wave forces frequency domain,using anchor angle conver-sion method,the paper obtained a good anchoring program by specific study object of dual pon-toon floating wave power generation device of the flow,through simulation coupling ways by hy-drodynamic analysis software AQWA.A similar design of floating marine device carrier mooring system solutions were also explored.%文章基于波浪力时域频域的运动理论,采用变换锚链夹角的方法,通过水动力软件AQWA进行仿真耦合分析的方式,得出针对特定研究对象即双浮筒漂浮式浪流发电装置的最佳锚泊方案,进而探讨类似的漂浮式海洋装置载体锚泊系统方案的设计。

  15. Helicopter flights with night-vision goggles: Human factors aspects

    Science.gov (United States)

    Brickner, Michael S.

    1989-01-01

    Night-vision goggles (NVGs) and, in particular, the advanced, helmet-mounted Aviators Night-Vision-Imaging System (ANVIS) allows helicopter pilots to perform low-level flight at night. It consists of light intensifier tubes which amplify low-intensity ambient illumination (star and moon light) and an optical system which together produce a bright image of the scene. However, these NVGs do not turn night into day, and, while they may often provide significant advantages over unaided night flight, they may also result in visual fatigue, high workload, and safety hazards. These problems reflect both system limitations and human-factors issues. A brief description of the technical characteristics of NVGs and of human night-vision capabilities is followed by a description and analysis of specific perceptual problems which occur with the use of NVGs in flight. Some of the issues addressed include: limitations imposed by a restricted field of view; problems related to binocular rivalry; the consequences of inappropriate focusing of the eye; the effects of ambient illumination levels and of various types of terrain on image quality; difficulties in distance and slope estimation; effects of dazzling; and visual fatigue and superimposed symbology. These issues are described and analyzed in terms of their possible consequences on helicopter pilot performance. The additional influence of individual differences among pilots is emphasized. Thermal imaging systems (forward looking infrared (FLIR)) are described briefly and compared to light intensifier systems (NVGs). Many of the phenomena which are described are not readily understood. More research is required to better understand the human-factors problems created by the use of NVGs and other night-vision aids, to enhance system design, and to improve training methods and simulation techniques.

  16. Use of weather forecasts to control night cooling

    Energy Technology Data Exchange (ETDEWEB)

    Wittchen, K.B. [Danish Building Research Inst., Horsholm (Denmark); Logberg, E.; Pedersen, S.; Djurtoft, R. [Birch and Krogboe Consultants and Planners, Virum (Denmark); Thiesen, J. [Vejr2 Private Weather Service of Denmark, Roskilde (Denmark)

    2005-07-01

    Night cooling can reduce the energy consumption for conditioning spaces in a building by allowing cool night air to flow as free cooling through a mechanical ventilation system or as ventilation driven by natural buoyancy. This study examined the feasibility of saving energy by having a better control strategy for night cooling in an office building. The work was based on the premise that having accurate knowledge of the weather would allow for greater control of night cooling. The enhanced control should result in both energy savings and thermal comfort. Traditional night cooling strategies create challenges in cold or moderate climates during the first hours of work because if the buildings are cooled to eliminate the cooling load of the following day, the indoor operative temperature will likely be too low to be acceptable. The solution is to provide a boost of hot air in the morning to compensate for the cool construction. The energy savings are attributed to the minimization of the boost of heated air in the morning to overcome thermal discomfort due to cold construction, and to the storage of the appropriate amount of cooling in the construction when the external loads of the following day are known. It was concluded that the use of local weather forecasts is a promising approach to control passive night cooling. Night ventilation driven by mechanical ventilation system will increase the energy use of the fans and this increase may be in the same order of magnitude as the energy savings obtained by reducing the cooling load due to efficient night cooling. It was noted that further development of the method is needed before implementation in real buildings. 9 refs., 2 tabs., 9 figs.

  17. The Unified Floating Point Vector Coprocessor for Reconfigurable Hardware

    Science.gov (United States)

    Kathiara, Jainik

    There has been an increased interest recently in using embedded cores on FPGAs. Many of the applications that make use of these cores have floating point operations. Due to the complexity and expense of floating point hardware, these algorithms are usually converted to fixed point operations or implemented using floating-point emulation in software. As the technology advances, more and more homogeneous computational resources and fixed function embedded blocks are added to FPGAs and hence implementation of floating point hardware becomes a feasible option. In this research we have implemented a high performance, autonomous floating point vector Coprocessor (FPVC) that works independently within an embedded processor system. We have presented a unified approach to vector and scalar computation, using a single register file for both scalar operands and vector elements. The Hybrid vector/SIMD computational model of FPVC results in greater overall performance for most applications along with improved peak performance compared to other approaches. By parameterizing vector length and the number of vector lanes, we can design an application specific FPVC and take optimal advantage of the FPGA fabric. For this research we have also initiated designing a software library for various computational kernels, each of which adapts FPVC's configuration and provide maximal performance. The kernels implemented are from the area of linear algebra and include matrix multiplication and QR and Cholesky decomposition. We have demonstrated the operation of FPVC on a Xilinx Virtex 5 using the embedded PowerPC.

  18. A Fast Floating Point Double Precision Implementation on Fpga

    Directory of Open Access Journals (Sweden)

    Monika Maan

    2016-06-01

    Full Text Available In the modern day digital systems, floating point units are an important component in many signal and image processing applications. Many approaches of the floating point units have been proposed and compared with their counterparts in recent years. IEEE 754 floating point standard allows two types of precision units for floating point operations, single and double. In the proposed architecture double precision floating point unit is used and basic arithmetic operations are performed. A parallel architecture is proposed along with the high speed adder, which is shared among other operations and can perform operations independently as a separate unit. To improve the area efficiency of the unit, carry select adder is designed with the novel resource sharing technique which allows performing the operations with the minimum usage of the resources while computing the carry and sum for „0‟ and „1‟. The design is implemented using the Xilinx Spartan 6 FPGA and the results show the 23% improvement in the speed of the designed circuit.

  19. Night Vision Device and Cockpit Displays

    Data.gov (United States)

    Federal Laboratory Consortium — The Night Vision Device and Cockpit Display labevaluates night vision devices and certifies them for use in the fleet. Lab functions supported include: Analysis of...

  20. Floating Charge%Floating Charge--浮动抵押

    Institute of Scientific and Technical Information of China (English)

    鲍为民

    2004-01-01

    "Floating Charge"来源于英美法系,它将担保设立在公司的全部财产之上(该担保甚至可及于公司未来之财产),在结晶前公司对财产享有处分权.通过介绍Floating Charge的创立和发展变化,从设定和实施两个方面详细考察了该制度的具体内涵.最后通过和大陆法系财团抵押制度的对比,提出应在我国引进浮动抵押,完善企业担保制度.

  1. Floating point hardware emulator for RSX-11D

    Energy Technology Data Exchange (ETDEWEB)

    Kellogg, M.; Long, M.

    1977-01-01

    An RSX-11D task was written to simulate the FP-11 floating point hardware on systems that lack this hardware. The simulation is transparent to tasks using floating point instructions. All normal features of the hardware are simulated exactly, including its action on exception conditions. The emulator is a privileged task occupying about 2.7K words of memory. When it is loaded and run, it sets up a linkage to intercept the reserved instruction trap before it reaches the executive, and route it to a service routine that can decode and simulate the floating point instruction set. The results of a benchmark timing test are given, as are notes on converting the emulator to run under RSX-11M. 1 figure, 2 tables.

  2. VLSI design techniques for floating-point computation

    Energy Technology Data Exchange (ETDEWEB)

    Bose, B. K.

    1988-01-01

    The thesis presents design techniques for floating-point computation in VLSI. A basis for area-time design decisions for arithmetic and memory operations is formulated from a study of computationally intensive programs. Tradeoffs in the design and implementation of an efficient coprocessor interface are studied, together with the implications of hardware support for the IEEE Floating-Point Standard. Algorithm area-time tradeoffs for basic arithmetic functions are analyzed in light of changing technology. Details of a single-chip floating-point unit designed in two-micron CMOS for SPUR are described, including special design considerations for very wide data paths. The pervasive effects of scaling technology on different levels of design are explored, from devices and circuits, through logic and micro-architecture, to algorithms and systems.

  3. Research of design challenges and new technologies for floating LNG

    Science.gov (United States)

    Lee, Dong-Hyun; Ha, Mun-Keun; Kim, Soo-Young; Shin, Sung-Chul

    2014-06-01

    With the rate of worldwide LNG demand expected to grow faster than that of gas demand, most major oil companies are currently investing their resources to develop floating LNG-FLNG (i.e. LNG FSRU and LNG FPSO). The global Floating LNG (FLNG) market trend will be reviewed based on demand and supply chain relationships. Typical technical issues associated with FLNG design are categorized in terms of global performance evaluation. Although many proven technologies developed through LNG carrier and oil FPSO projects are available for FLNG design, we are still faced with several technical challenges to clear for successful FLNG projects. In this study, some of the challenges encountered during development of the floating LNG facility (i.e. LNG FPSO and FSRU) will be reviewed together with their investigated solution. At the same time, research of new LNG-related technologies such as combined containment system will be presented.

  4. Research of design challenges and new technologies for floating LNG

    Directory of Open Access Journals (Sweden)

    Lee Dong-Hyun

    2014-06-01

    Full Text Available With the rate of worldwide LNG demand expected to grow faster than that of gas demand, most major oil companies are currently investing their resources to develop floating LNG-FLNG (i.e. LNG FSRU and LNG FPSO. The global Floating LNG (FLNG market trend will be reviewed based on demand and supply chain relationships. Typical technical issues associated with FLNG design are categorized in terms of global performance evaluation. Although many proven technologies developed through LNG carrier and oil FPSO projects are available for FLNG design, we are still faced with several technical challenges to clear for successful FLNG projects. In this study, some of the challenges encountered during development of the floating LNG facility (i.e. LNG FPSO and FSRU will be reviewed together with their investigated solution. At the same time, research of new LNG-related technologies such as combined containment system will be presented.

  5. The reported incidence of man-machine interface issues in Army aviators using the Aviator's Night Vision System (ANVIS) in a combat theatre

    Science.gov (United States)

    Hiatt, Keith L.; Rash, Clarence E.

    2011-06-01

    Background: Army Aviators rely on the ANVIS for night operations. Human factors literature notes that the ANVIS man-machine interface results in reports of visual and spinal complaints. This is the first study that has looked at these issues in the much harsher combat environment. Last year, the authors reported on the statistically significant (p89,000 flight hours of which >22,000 were with ANVIS) participated. Analysis demonstrated high complaints of almost all levels of back and neck pain. Additionally, the use of body armor and other Aviation Life Support Equipment (ALSE) caused significant ergonomic complaints when used with ANVIS. Conclusions: ANVIS use in a combat environment resulted in higher and different types of reports of spinal symptoms and other man-machine interface issues over what was previously reported. Data from this study may be more operationally relevant than that of the peacetime literature as it is derived from actual combat and not from training flights, and it may have important implications about making combat predictions based on performance in training scenarios. Notably, Aircrew remarked that they could not execute the mission without ANVIS and ALSE and accepted the degraded ergonomic environment.

  6. Analysis of Responses of Floating Dual Pontoon Structure

    Institute of Scientific and Technical Information of China (English)

    WENG Wen-Kai; CHOU Chung-Ren

    2007-01-01

    A numerical model is developed by use of the boundary integral equation method to investigate the responses of a two-dimensional floating structure.The structure under consideration consisting of two pontoons,is connected by a rigid framework,and linked to the sea floor by a mooring system.The theoretical conception is based on potential theory with linear external forces,and applied to an arbitrarily shaped body and water depth.The discussion includes the influence of draft and space between pontoons on the responses of the floating structure.Finally,the validity of the method is adequately verified by experimental results.

  7. Design and Implementation of a Certain Self-propelled Anti-aircraft Gun Floating Parameter Monitoring System%某自行高炮浮动参数监测系统的设计与实现

    Institute of Scientific and Technical Information of China (English)

    孙致远; 郑坚; 熊超; 殷军辉

    2016-01-01

    为了能够实时掌握自行高炮自动机性能,提高装备的可靠性,利用无线传感器网络技术,设计并建立了自行高炮浮动参数监测系统。该监测系统利用磁致伸缩位移传感器,实现了后坐位移的精确测量;设计了一种具有高速采集和片上处理功能的无线传感器网络节点,实现了数据的采集、储存与无线传输;开发了上位机软件,能够根据回传数据,完成后坐曲线的显示和浮动参数的自动提取。实弹测试试验表明,该监测系统能够基本满足自行高炮浮动参数在线监测的要求。%For the purpose of keeping track of the performance of the auto-mechanism of self-propelled anti-aircraft gun and improve its reliability,the floating parameter monitoring system of self-propelled anti-aircraft gun was designed and established based on the wireless sensor networks (WSNs)technolo-gy. In the monitoring system,the magnetostriction displacement sensors were used to successfully and accurately pick up the recoil displacement. A WSN node with high speed acquisition and on-chip pro-cessing was designed to realize the data collection,storage and wireless transmission. The host compu-ter software was designed to achieve the recoil curve display and the floating parameter automation ex-traction according to the data received. The firing test shows that the system can basically satisfy the floating parameter on-line monitoring requirement.

  8. The Clouds That Float By

    Institute of Scientific and Technical Information of China (English)

    1995-01-01

    AS I walk toward the autumn of my life, I begin to realize that everything in the world seems to have moved in a cycle, like the four seasons that continue to change and renew outside my window. But I am still seated in front of my window, observing the floating clouds at the ends of the earth. Some of them float from the future, some from the past. They join at the head and the tail of the universe; it is hard to tell the dragon’s head from the dragon’s tail. Things are always like this—the beginnings and the endings are sometimes interchangeable; the things that you think have gone by, have gone far away or completely vanished will suddenly appear before you like old acquaintances. Perhaps it might be the second generation accompanied by the shadows of the first.

  9. Floating VAWT wind farm concepts

    OpenAIRE

    Schmidt Paulsen, Uwe; Friis Pedersen, Troels; Vita, Luca

    2008-01-01

    The report contains proposals and descriptions of VAWTs of 200kW, 1MW, 5MW and 25MW sizes in terms of dimensions, weights, loads, and power production. Additionally a proposal of the use of each of these sizes in a concept description for a 100MW wind farm. Manufacture, transportation, installation, maintenance and operation of VAWTs are considered briefly. A summary on advantages and disadvantages of floating VAWTs is given.

  10. Benchmarks to supplant export FPDR (Floating Point Data Rate) calculations

    Energy Technology Data Exchange (ETDEWEB)

    Bailey, D.; Brooks, E.; Dongarra, J.; Hayes, A.; Lyon, G.

    1988-06-01

    Because modern computer architectures render application of the FPDR (Floating Point Data Processing Rate) increasingly difficult, there has been increased interest in export evaluation via actual system performances. The report discusses benchmarking of uniprocessor (usually vector) machines for scientific computation (SIMD array processors are not included), and parallel processing and its characterization for export control.

  11. Experimental testing of moorings for large floating wave energy converters

    DEFF Research Database (Denmark)

    Thomsen, Jonas Bjerg; Ferri, Francesco; Kofoed, Jens Peter

    2016-01-01

    This paper presents the outcome of a test campaign, which investigates the behaviour of a synthetic mooring system applied to the Floating Power Plant wave energy converter. The study investigates the motion and tension response under operational and extreme sea states expected at the deployment...

  12. Experimental testing of moorings for large floating wave energy converters

    DEFF Research Database (Denmark)

    Thomsen, Jonas Bjerg; Ferri, Francesco; Kofoed, Jens Peter

    2016-01-01

    This paper presents the outcome of a test campaign, which investigates the behaviour of a synthetic mooring system applied to the Floating Power Plant wave energy converter. The study investigates the motion and tension response under operational and extreme sea states expected at the deployment ...

  13. Thickness monitor for floated sludge

    Energy Technology Data Exchange (ETDEWEB)

    Ricketts, J.; Grecu, G.M.

    1989-10-31

    This patent describes apparatus for determining the thickness of a layer of aerated sludge floating on a layer of a heavier liquid in a tank. It comprises: a frame means which can be positioned to extend vertically into the tank; horizontally-extending indicator means supported by and moveable vertically with respect to a portion of the frame means extending vertically into the tank. The indicator means being selectively positionable at the highest level of sludge in the tank; horizontally-extending lower base means attached to the frame means at or near the bottom thereof; horizontally-extending upper base means attached to the frame means at or near the top thereof; and a line carrying a float means. The line being movable secured at the upper base means and the lower base means. The float means being floatable on the liquid and including a horizontally-extending portion presenting an upwardly directed generally planar surface, which surface will be parallel to the interface of the sludge and liquid.

  14. popscience - European Researchers Night 2014

    CERN Multimedia

    Jeanneret, Guillaume

    2014-01-01

    Vendredi 26 septembre 2014, le CERN célèbrera la Nuit européenne des chercheurs à Genève et à St-Genis-Pouilly. Le thème de l’édition 2014 est inspiré d’Andy Warhol : « Pop science is for everyone ». On Friday 26 September 2014, CERN will be celebrating European Researchers' Night at three venues in Geneva and St. Genis-Pouilly. Inspired by Andy Warhol, this year's theme is “Pop science is for everyone”.

  15. Sleep, ageing and night work

    Directory of Open Access Journals (Sweden)

    M.L.N. Pires

    2009-09-01

    Full Text Available Studies have shown that the frequency or worsening of sleep disorders tends to increase with age and that the ability to perform circadian adjustments tends to decrease in individuals who work the night shift. This condition can cause consequences such as excessive sleepiness, which are often a factor in accidents that occur at work. The present study investigated the effects of age on the daytime and nighttime sleep patterns using polysomnography (PSG of long-haul bus drivers working fixed night or day shifts. A total of 124 drivers, free of sleep disorders and grouped according to age (<45 years, N = 85, and ≥45 years, N = 39 and PSG timing (daytime (D PSG, N = 60; nighttime (N PSG, N = 64 participated in the study. We observed a significant effect of bedtime (D vs N and found that the length of daytime sleep was shorter [D: <45 years (336.10 ± 73.75 min vs N: <45 years (398 ± 78.79 min and D: ≥45 years (346.57 ± 43.17 min vs N: ≥45 years (386.44 ± 52.92 min; P ≤ 0.05]. Daytime sleep was less efficient compared to nighttime sleep [D: <45 years (78.86 ± 13.30% vs N: <45 years (86.45 ± 9.77% and D: ≥45 years (79.89 ± 9.45% and N: ≥45 years (83.13 ± 9.13%; P ≤ 0.05]. An effect of age was observed for rapid eye movement sleep [D: <45 years (18.05 ± 6.12% vs D: ≥45 years (15.48 ± 7.11% and N: <45 years (23.88 ± 6.75% vs N: ≥45 years (20.77 ± 5.64%; P ≤ 0.05], which was greater in younger drivers. These findings are inconsistent with the notion that older night workers are more adversely affected than younger night workers by the challenge of attempting to rest during the day.

  16. Floating Population Increase and Its Influence on the Urban Population Situation: A Case Study in Beijing

    Institute of Scientific and Technical Information of China (English)

    Wu Peilin; Lu Qi

    2005-01-01

    Floating population is a special population group in China resulting from the implementation of household registration system. This paper uses a set of floating population survey data, population censuses data and statistical data to analyze the increase and influence of floating population on the urban population situations in Beijing. It is found that Beijing has experienced a rapid increase of floating population since the 1990s and that the increase of this group has become the key factor of the current population expansion in the city. Its distribution in the urban regions intensified and extended the subutbanization process of the capital. In addition,the population structures of sex, age, education and employment in Beijing have changed to some extent due to the influx of floating population.

  17. Floating microspheres of valacyclovir HCl: Formulation, optimization, characterization, in vitro and in vivo floatability studies

    Directory of Open Access Journals (Sweden)

    Nilamgiri Goswami

    2012-01-01

    Full Text Available Floating microspheres are multiple unit Gastroretentive drug delivery systems. Valacyclovir hydrochloride (VCH is L-valyl ester prodrug of acyclovir. VCH degrades in intestinal fluid. The objective was to develop floating microspheres of VCH to localise the drug at upper part of GIT, for improved absorption. Floating microspheres were prepared by W/O emulsification solvent evaporation method using Ethylcellulose (EC as polymer. Particle size and % EE were 550.021±0.241 μm, 79.88±2.236% respectively. in vitro and in vivo floatability studies confirmed floating behaviour of microspheres. VCH loaded floating microspheres can be a suitable alternative to the conventional formulation, by localizing the drug at upper GIT.

  18. Floating treatment wetlands for domestic wastewater treatment.

    Science.gov (United States)

    Faulwetter, J L; Burr, M D; Cunningham, A B; Stewart, F M; Camper, A K; Stein, O R

    2011-01-01

    Floating islands are a form of treatment wetland characterized by a mat of synthetic matrix at the water surface into which macrophytes can be planted and through which water passes. We evaluated two matrix materials for treating domestic wastewater, recycled plastic and recycled carpet fibers, for chemical oxygen demand (COD) and nitrogen removal. These materials were compared to pea gravel or open water (control). Experiments were conducted in laboratory scale columns fed with synthetic wastewater containing COD, organic and inorganic nitrogen, and mineral salts. Columns were unplanted, naturally inoculated, and operated in batch mode with continuous recirculation and aeration. COD was efficiently removed in all systems examined (>90% removal). Ammonia was efficiently removed by nitrification. Removal of total dissolved N was ∼50% by day 28, by which time most remaining nitrogen was present as NO(3)-N. Complete removal of NO(3)-N by denitrification was accomplished by dosing columns with molasses. Microbial communities of interest were visualized with denaturing gradient gel electrophoresis (DGGE) by targeting specific functional genes. Shifts in the denitrifying community were observed post-molasses addition, when nitrate levels decreased. The conditioning time for reliable nitrification was determined to be approximately three months. These results suggest that floating treatment wetlands are a viable alternative for domestic wastewater treatment.

  19. Development and Characterization of Novel Floating-Mucoadhesive Tablets Bearing Venlafaxine Hydrochloride

    Directory of Open Access Journals (Sweden)

    Raghvendra Misra

    2016-01-01

    Full Text Available The present investigation is concerned about the development of floating bioadhesive drug delivery system of venlafaxine hydrochloride which after oral administration exhibits a unique combination of floating and bioadhesion to prolong gastric residence time and increase drug bioavailability within the stomach. The floating bioadhesive tablets were prepared by the wet granulation method using different ratios of hydroxypropyl methyl cellulose (HPMC K4MCR and Carbopol 934PNF as polymers. Sodium bicarbonate (NaHCO3 and citric acid were used as gas (CO2 generating agents. Tablets were characterized for floating properties, in vitro drug release, detachment force, and swelling index. The concentration of hydroxypropyl methyl cellulose and Carbopol 934PNF significantly affects the in vitro drug release, floating properties, detachment force, and swelling properties of the tablets. The optimized formulation showed the floating lag time 72±2.49 seconds and duration of floating 24.50±0.74 hr. The in vitro release studies and floating behavior were studied in simulated gastric fluid (SGF at pH 1.2. Different drug release kinetics models were also applied. The in vitro drug release from tablets was sufficiently sustained (more than 18 hr and the Fickian transports of the drug from the tablets were confirmed. The radiological evidence suggests that the tablets remained buoyant and altered position in the stomach of albino rabbit and mean gastric residence time was prolonged (more than > 6 hr.

  20. Evaluation of visual acuity with Gen 3 night vision goggles

    Science.gov (United States)

    Bradley, Arthur; Kaiser, Mary K.

    1994-01-01

    Using laboratory simulations, visual performance was measured at luminance and night vision imaging system (NVIS) radiance levels typically encountered in the natural nocturnal environment. Comparisons were made between visual performance with unaided vision and that observed with subjects using image intensification. An Amplified Night Vision Imaging System (ANVIS6) binocular image intensifier was used. Light levels available in the experiments (using video display technology and filters) were matched to those of reflecting objects illuminated by representative night-sky conditions (e.g., full moon, starlight). Results show that as expected, the precipitous decline in foveal acuity experienced with decreasing mesopic luminance levels is effectively shifted to much lower light levels by use of an image intensification system. The benefits of intensification are most pronounced foveally, but still observable at 20 deg eccentricity. Binocularity provides a small improvement in visual acuity under both intensified and unintensified conditions.

  1. Wide-field-of-view (WFOV) night vision goggle

    Science.gov (United States)

    Isbell, Wayne; Estrera, Joseph P.

    2003-09-01

    The United States' armed forces continue to be presented with increased challenges in adverse operational environments with increasing risk and complexity - especially at night. To ensure continued operational success and battlefield superiority during darkness, our armed forces must be equipped with night vision (NV) systems providing increased situational awareness. Doing so will significantly enhance threat detection and engagement, as well as survivability, thus ensuring greater mission success. Northrop Grumman Electro-Optical Systems (EOS) continues to develop its Wide Field of View (WFOV) image intensification (I2) night vision system for ground forces. This system will provide a significant increase in visual coverage enabling US forces to continue "to own the night". Until now, NV systems have typically been limited to a 40-degree field of view (FOV), vertically and horizontally. This limited FOV reduces off-axis detection, restricts an individual soldier's recognition and engagement capabilities and hinders added peripheral vision. To counter this operational deficiency, EOS proposes the Wide Field of View (WFOV) night vision binocular. The WFOV system will have a 70-degree horizontal FOV, with a 55-degree vertical FOV. The increased FOV will result in increased situational awareness of soldiers' surrounding environment (including terrain, hazards, threat, etc) during normal night operations. It will also allow for rapid and safer movement, especially in MOUT operations. Additionally, the increased visual coverage of large areas will enable soldiers to detect and engage targets faster and with greater reliability. The WFOV binocular will significantly enhance survivability, threat detection and engagement, and hence, greater mission success rate.

  2. 14 CFR 27.753 - Main float design.

    Science.gov (United States)

    2010-01-01

    ... STANDARDS: NORMAL CATEGORY ROTORCRAFT Design and Construction Floats and Hulls § 27.753 Main float design. (a) Bag floats. Each bag float must be designed to withstand— (1) The maximum pressure differential... 14 Aeronautics and Space 1 2010-01-01 2010-01-01 false Main float design. 27.753 Section...

  3. 14 CFR 29.753 - Main float design.

    Science.gov (United States)

    2010-01-01

    ... STANDARDS: TRANSPORT CATEGORY ROTORCRAFT Design and Construction Floats and Hulls § 29.753 Main float design. (a) Bag floats. Each bag float must be designed to withstand— (1) The maximum pressure differential... 14 Aeronautics and Space 1 2010-01-01 2010-01-01 false Main float design. 29.753 Section...

  4. Panoramic night vision goggle flight test results

    Science.gov (United States)

    Franck, Douglas L.; Geiselman, Eric E.; Craig, Jeffrey L.

    2000-06-01

    The Panoramic Night Vision Goggle (PNVG) has begun operational test and evaluation with its 100-degree horizontal by 40-degree vertical field of view (FOV) on different aircraft and at different locations. Two configurations of the PNVG are being evaluated. The first configuration design (PNVG I) is very low in profile and fits underneath a visor. PNVG I can be retained by the pilot during ejection. This configuration is interchangeable with a day helmet mounted tracker and display through a standard universal connector. The second configuration (PNVG II) resembles the currently fielded 40-degree circular FOV Aviator Night Vision Imaging Systems (ANVIS) and is designed for non-ejection seat aircraft and ground applications. Pilots completed subjective questionnaires after each flight to compare the capability of the 100-degree horizontal by 40-degree vertical PNVG to the 40-degree circular ANVIS across different operational tasks. This paper discusses current findings and pilot feedback from the flight trials objectives of the next phase of the PNVG program are also discussed.

  5. Analysis of Switched-Rigid Floating Oscillator

    Directory of Open Access Journals (Sweden)

    Prabhakar R. Marur

    2009-01-01

    Full Text Available In explicit finite element simulations, a technique called deformable-to-rigid (D2R switching is used routinely to reduce the computation time. Using the D2R option, the deformable parts in the model can be switched to rigid and reverted back to deformable when needed during the analysis. The time of activation of D2R however influences the overall dynamics of the system being analyzed. In this paper, a theoretical basis for the selection of time of rigid switching based on system energy is established. A floating oscillator problem is investigated for this purpose and closed-form analytical expressions are derived for different phases in rigid switching. The analytical expressions are validated by comparing the theoretical results with numerical computations.

  6. Night shift work and modifiable lifestyle factors

    Directory of Open Access Journals (Sweden)

    Beata Pepłońska

    2014-10-01

    Full Text Available Objectives: Night shift work has been linked to some chronic diseases. Modification of lifestyle by night work may partially contribute to the development of these diseases, nevertheless, so far epidemiological evidence is limited. The aim of the study was to explore association between night shift work and lifestyle factors using data from a cross-sectional study among blue-collar workers employed in industrial plants in Łódź, Poland. Material and Methods: The anonymous questionnaire was self-administered among 605 employees (236 women and 369 men, aged 35 or more - 434 individuals currently wor­king night shifts. Distribution of the selected lifestyle related factors such as smoking, alcohol drinking, physical activity, body mass index (BMI, number of main meals and the hour of the last meal was compared between current, former, and never night shift workers. Adjusted ORs or predicted means were calculated, as a measure of the associations between night shift work and lifestyle factors, with age, marital status and education included in the models as covariates. Results: Recreational inactivity (defined here as less than one hour per week of recreational physical activity was associated with current night shift work when compared to never night shift workers (OR = 2.43, 95% CI: 1.13-5.22 among men. Alcohol abstinence and later time of the last meal was associated with night shift work among women. Statistically significant positive relationship between night shift work duration and BMI was observed among men (p = 0.029. Conclusions: This study confirms previous studies reporting lower exercising among night shift workers and tendency to increase body weight. This finding provides important public health implication for the prevention of chronic diseases among night shift workers. Initiatives promoting physical activity addressed in particular to the night shift workers are recommended.

  7. Ecologically engineered system (EES) designed to integrate floating, emergent and submerged macrophytes for the treatment of domestic sewage and acid rich fermented-distillery wastewater: Evaluation of long term performance.

    Science.gov (United States)

    Venkata Mohan, S; Mohanakrishna, G; Chiranjeevi, P; Peri, Dinakar; Sarma, P N

    2010-05-01

    An ecologically engineered system (EES) was designed to mimic the natural cleansing functions of wetlands to bring about wastewater treatment. EES consisted of three tanks containing diverse biota viz., aquatic macrophytes, submerged plants, emergent plants and filter feeders connected in series. The designed system was evaluated for 216days by operating in continuous mode (20l/day) to treat both sewage (DS) and fermented-distillery wastewater (FDW, from hydrogen producing bioreactor). Floating macrophyte system (Tank 1) was more effective in removing COD and nitrates. Submerged and emergent integrated macrophyte system (Tank 2) showed an effective removal of volatile fatty acids (VFAs) along with COD. Filter-feeding system (Tank 3) visualized the removal of COD, VFA, turbidity and color. On the whole the system can treat effectively DS (COD, 68.06%; nitrate, 22.41%; turbidity, 59.81%) and FDW (COD, 72.92%; nitrate, 23.15%; color, 46.0%). The designed EES can be considered as an economical approach for the treatment of both sewage and fermented wastewaters. Copyright 2009 Elsevier Ltd. All rights reserved.

  8. FPGA-based floating-point datapath design for geometry processing

    Science.gov (United States)

    Xing, Shanzhen; Yu, William W.

    1998-10-01

    Geometry processing comprises of a great many computationally intensive floating-point operations. Real- time graphics systems generally use application-specific custom designed parallel hardware to provide the high performance computation power. When designing a graphics engine on a FPGA-based configurable computing system, cost- effectiveness is important. This paper investigates and proposes a cost-effective FPGA-based floating-point datapath for geometry process. It is designed to be a basic building block for FPGA-based geometry processors. The implemented datapath operates at a frequency of 6.25 Mhz and has an average floating-point operation time of 10.2 microseconds.

  9. Surface Tension Supported Floating of Heavy Objects: Why Elongated Bodies Float Better?

    CERN Document Server

    Bormashenko, Edward

    2015-01-01

    Floating of bodies heavier than the supporting liquid is discussed. Floating of cylindrical, ellipsoidal bodies and rectangular plates possessing lateral dimensions smaller than the capillary length is treated. It is demonstrated that more elongated bodies of a fixed volume are better supported by capillary forces, due to the increase in the perimeter of the triple line. Thus, floating of metallic needles obtains reasonable explanation.

  10. 14 CFR 27.751 - Main float buoyancy.

    Science.gov (United States)

    2010-01-01

    ... STANDARDS: NORMAL CATEGORY ROTORCRAFT Design and Construction Floats and Hulls § 27.751 Main float buoyancy. (a) For main floats, the buoyancy necessary to support the maximum weight of the rotorcraft in...

  11. 14 CFR 29.751 - Main float buoyancy.

    Science.gov (United States)

    2010-01-01

    ... STANDARDS: TRANSPORT CATEGORY ROTORCRAFT Design and Construction Floats and Hulls § 29.751 Main float buoyancy. (a) For main floats, the buoyancy necessary to support the maximum weight of the rotorcraft...

  12. Hydroelasticity of a Floating Plate

    DEFF Research Database (Denmark)

    Chen, X.; Jensen, Jørgen Juncher; Cui, W.

    2003-01-01

    The membrane forces are included in the hydroelastic analysis of a floating plate undergoing large vertical deflections in regular monochromatic multidirectional waves. The first-order vertical displacements induced by the linear wave exciting forces are calculated by the mode expansion method...... in the frequency domain. The second-order vertical displacements induced by the membrane forces are calculated by the von Karman plate theory. The results show that the membrane contribution both in terms of the axial stresses and the effect on the bending stresses can be important...

  13. Visualized intravesical floating hydrogel encapsulating vaporized perfluoropentane for controlled drug release.

    Science.gov (United States)

    Zhu, Guanchen; Zhang, Yifan; Wang, Kaikai; Zhao, Xiaozhi; Lian, Huibo; Wang, Wei; Wang, Haoran; Wu, Jinhui; Hu, Yiqiao; Guo, Hongqian

    2016-10-01

    Intravesical drug delivery is the main strategy for the treatment of bladder disorders. To reduce the relief arising from frequent intravesical instillation, mucoadhesive hydrogel was used for the controlled release of the drug. However, the viscosity of mucoadhesive gel might cause severe urinary obstruction and bladder irritation. To solve all these problems, a floating hydrogel delivery system was developed using perfluoropentane (PFP) as the floating agent. After intravesical instillation of the floating hydrogel, the increased temperature in bladder vaporized PFP, resulting in the generation of microbubbles in the hydrogel. Then, it can float in urine to avoid the urinary obstruction and bladder irritation. In this study, systematic experiments were conducted to investigate the influences of PFP vaporization on the morphology and floating ability of hydrogels. The floating process is much milder and safer than other floating methods published before. In addition, PFP had been used as contrast agent, which affiliated the monitoring of gels during the operation. Therefore, this new drug delivery system addresses the problems of conventional intravesical instillation and is promising for clinic use.

  14. Performance of a day/night water heat storage system for heating and cooling of semi-closed greenhouses in mild winter climate

    NARCIS (Netherlands)

    Baeza, E.J.; Pérez Parra, J.J.; López, J.C.; Gázquez, J.C.; Meca, D.E.; Stanghellini, C.; Kempkes, F.L.K.; Montero, J.I.

    2012-01-01

    A novel system for heating/cooling greenhouses based on air/water heat exchangers connected to a thermally stratified water storage tank was tested in a small greenhouse compartment at the Experimental Station of the Cajamar Foundation in Almería, Spain. The system maintained a closed greenhouse (no

  15. Renewable Energy Based Floating Power Generator (Rivers and Canals

    Directory of Open Access Journals (Sweden)

    Dr. J.R.Gandhi

    2016-02-01

    Full Text Available We have developed a stand alone, (river and canal water stream floating power generator system for village electrification, agriculture water pumping, bridge street lights and such other utilities. The system is the unique one of its kind as per our knowledge and various surveys. The physical structure of the system is made of the non corrosive and unbreakable materials like mild steel, fiber glass etc. It works, as it rotates in the water flow. It does not require any kind of the external electric grid power for its working. As the water flows, the specially designed blades of the system rotate in the direction of the flow and ultimately the consistent power is generated, this power can be used directly or it may be stored in battery and the utilized as and when required. No permanent installation, No pollution and environment friendly floating Pico turbine. The observations taken from the sight are tabulated and accordingly results are discussed.

  16. GLOBE at Night: Scientific Research outside of the Classroom

    Science.gov (United States)

    Henderson, S.; Walker, C. E.; Geary, E.; Pompea, S. M.

    2005-12-01

    Increased and robust understanding of our environment requires learning opportunities that take place outside of the traditional K-12 classroom and beyond the confines of the school day. GLOBE at Night is a new event within The GLOBE Program that provides a mechanism for a nontraditional learning activity involving teachers, students, and their families taking observations of the night sky around the world and reporting their observations via a central data base for analysis. To support activities centered on authentic research experiences such as GLOBE at Night, The GLOBE Program has changed its approach to professional development (PD). The new focus of GLOBE PD efforts is centered on teachers being able to facilitate student research in and out of the classroom reflective of authentic scientific research experiences. It has been recognized that there is a critical need for effective teacher professional development programs that support teacher involvement in meaningful scientific research that encourages partnerships between scientists, teachers, and students. Partnerships promoting scientific research for K-12 audiences provides the foundation for The GLOBE Program, an international inquiry-based program designed to engage teachers with their students in partnership with research scientists to better understand the environment at local, regional, and global scales. GLOBE is an ongoing international science and education program that unites students, teachers, and scientists in the study of the Earth System. Students participating in GLOBE engage in hands-on activities, including the collection, analysis, and sharing of research quality scientific data with their peers around the world. Students interact with members of the science community who use the data collected from locations around the world in their research - data that would often not be available otherwise. As of September 2005, over 30,000 teachers representing over 16,000 schools worldwide have

  17. Pembuatan Sediaan Floating Amoksisilin Menggunakan Cangkang Kapsul Alginat dan Uji Aktivitas Antibakterinya

    OpenAIRE

    Simanjuntak, Ade Yohana

    2016-01-01

    Background:Conventional dosage form of amoxicillin has short residence time in stomach, this matter became a major problem in the treatment of peptic ulcers caused by Helicobacter pylorithat cause not optimal treatment. Thus, drug delivery systems need to be developed which can last longer in the stomach with controlled release system, such as floating dosage form of amoxicillin using alginate capsule shell. Purpose:To evaluate the release and antibacterial effect of amoxicillin floating d...

  18. Floating liquid bridge charge dynamics

    Science.gov (United States)

    Teschke, Omar; Soares, David Mendez; Gomes, Whyllerson Evaristo; Valente Filho, Juracyr Ferraz

    2016-01-01

    The interaction of liquid with electric fields is investigated in a configuration where up to 13 kV are applied between electrodes resulting in a 106 V/m electric field in the capillaries and where there is the formation of a free-standing fluid bridge in the interelectrode gap. The Mott-Gurney equation was fitted to the measured ionization current vs applied voltage curve which indicates that the ionization rate at the high-voltage anode electrode dimethylsulfoxide (DMSO) interface and space charging in the interelectrode gap determine the floating liquid bridge current for a given cathode-to-anode voltage. Space charge effects were measured in the cathode becker and also at the liquid bridge since the ionized charges at the anode migrate to the bridge outer surface and decrease the interfacial tension from 43 mJ/m2 to 29 mJ/m2. Two distinct structural regions then form the bridge, a charged plastic (bulk modulus ˜100 MPa) conducting outer layer with a surface conductivity of ˜10-9 Ω-1, which shapes and supports the floating fluid structure, and an inner liquid cylinder, where DMSO molecules flow.

  19. Floating point numbers are real numbers

    OpenAIRE

    Mascarenhas, Walter F.

    2016-01-01

    Floating point arithmetic allows us to use a finite machine, the digital computer, to reach conclusions about models based on continuous mathematics. In this article we work in the other direction, that is, we present examples in which continuous mathematics leads to sharp, simple and new results about the evaluation of sums, square roots and dot products in floating point arithmetic.

  20. associated injuries and complications in floating knee management

    African Journals Online (AJOL)

    Traumatology Surgery, Cotonou Teaching Hospital, Republic of Bénin. Correspondence to: Dr. ... Keywords: Associated injuries, complications, Floating knee, Management .... floating knee: epidemiology, prognostic indicators. & outcome ...

  1. How do different definitions of night shift affect the exposure assessment of night work?

    DEFF Research Database (Denmark)

    Garde, Anne Helene; Hansen, Johnni; Kolstad, Henrik A

    2016-01-01

    The aim is to show how different definitions affect the proportion of shifts classified as night shifts. The Danish Working Hour Database was used to calculate number of night shifts according to eight definitions. More than 98% of the total night shifts were night shifts by use of both...... the reference definition (at least 3 h of work between 24:00 and 05:00) and definitions using a period during the night. The overlap with definitions based on starting and ending time was less pronounced (64-71 %). The proportion of classified night shifts differs little when night shifts are based...... on definitions including a period during the night. Studies based on other definitions may be less comparable....

  2. Floated pallet definition study. Volume 4: Summary volume

    Science.gov (United States)

    1975-01-01

    The conceptual design of a suspension system for the Floated Pallet and a retention system to support the pallet during launch, maneuvering and descent are described. In addition, a control moment gyroscope support equipment configuration study including installation and an experiment mount and erection study was performed. The impact of these separate hardware studies on the existing pallet configuration was assessed and a modified pallet common module defined.

  3. Experimental and Theoretical Analysis of a Combined Floating Wave and Wind Energy Conversion Platform

    DEFF Research Database (Denmark)

    Yde, Anders; Pedersen, Mads Mølgaard; Bellew, Sarah Bellew

    for a novel, floating, wave- and wind-energy hybrid device. To test the technology they have scaled the design to P37, a 37 m wide test platform that has been undergoing offshore testing for four complete test phases (totaling more than 2 years). The test platform provides electricity to the grid from both......This report presents results from the PSO project 2011-1-10668 entitled Poseidon 2. The project is a continuation of the previous PSO project entitled Aero-Hydro-Elastic Simulation Platform for Wave Energy Systems and floating Wind Turbines. Floating Power Plant has developed the technology...

  4. Wave Disturbance Reduction of a Floating Wind Turbine Using a Reference Model-based Predictive Control

    DEFF Research Database (Denmark)

    Christiansen, Søren; Tabatabaeipour, Seyed Mojtaba; Bak, Thomas;

    2013-01-01

    Floating wind turbines are considered as a new and promising solution for reaching higher wind resources beyond the water depth restriction of monopile wind turbines. But on a floating structure, the wave-induced loads significantly increase the oscillations of the structure. Furthermore, using...... a controller designed for an onshore wind turbine yields instability in the fore-aft rotation. In this paper, we propose a general framework, where a reference model models the desired closed-loop behavior of the system. Model predictive control combined with a state estimator finds the optimal rotor blade...... compared to a baseline floating wind turbine controller at the cost of more pitch action....

  5. Metabolic syndrome in permanent night workers.

    Science.gov (United States)

    Biggi, Nicoletta; Consonni, Dario; Galluzzo, Valeria; Sogliani, Marco; Costa, Giovanni

    2008-04-01

    Night and shift work might be risk factors for metabolic and cardiovascular disorders due to interference with diet, circadian metabolic rhythms, and lifestyle. The relationship between permanent night work and metabolic and cardiovascular risk factors was explored in a retrospective longitudinal study of workers employed in a large municipal enterprise in charge of street cleaning and domestic waste collection. All subjects who had worked night shifts between 1976 and 2007 as hand sweepers, motor sweepers, and delivery tricar drivers were compared with subjects who always worked the same jobs but on day shifts. From the periodical medical surveillance files, we identified 488 male workers who had been examined on average five times (minimum 2, maximum 14) during the study period, for a total of 2,328 medical examinations; 157 always had worked day shifts, 12 always the night shift, and 319 both (initially day and subsequently night shifts). Their age ranged from 22 to 62 yrs, and work experience varied from 1 to 28 yrs. Lifestyle habits (smoking, alcohol consumption), body mass index, serum glucose, total cholesterol, tryglicerides, hepatic enzymes, blood pressure, resting electrocardiogram, diabetes, coronary heart disease, hypertension, and related drugs were taken into consideration for the analysis. We used generalized estimating equations (GEE) models (exchangeable correlation matrix) to analyze the relationship between night work and health effects while accounting for within-subject correlations and adjusting for study period, job, age, and lifestyle variables. As a whole, night workers smoked more and had significantly higher BMI, serum total cholesterol, and triglycerides than day workers. Both the inter-individual comparison between day and night workers and the intra-individual comparison among the workers, who were day workers at the beginning of their employment and later became night workers, showed a significant increase in BMI, total cholesterol

  6. Obstacle detection during day and night conditions using stereo vision

    NARCIS (Netherlands)

    Dubbelman, G.; Mark, W. van der; Heuvel, J.C. van den; Groen, F.C.A.

    2007-01-01

    We have developed a stereo vision based obstacle detection (OD) system that can be used to detect obstacles in off-road terrain during both day and night conditions. In order to acquire enough depth estimates for reliable OD during low visibility conditions, we propose a stereo disparity (depth) est

  7. Color the night : applying daytime colors to nighttime imagery

    NARCIS (Netherlands)

    Toet, A.

    2003-01-01

    We present a method to give (fused) multiband night-time imagery a natural day-time color appearance. For input, the method requires a false color RGB image that is produced by mapping 3 individual bands (or the first 3 principal components) of a multiband nightvision system to the respective channe

  8. Day-to-night heat storage in greenhouses

    NARCIS (Netherlands)

    Seginer, Ido; Straten, van Gerrit; Beveren, van Peter J.M.

    2017-01-01

    Day-to-night heat storage in water tanks (buffers) is common practice in cold-climate greenhouses, where gas is burned during the day for carbon dioxide enrichment. In Part 1 of this study, an optimal control approach was outlined for such a system, the basic idea being that the virtual value

  9. Day-to-night heat storage in greenhouses

    NARCIS (Netherlands)

    Seginer, Ido; Straten, van Gerrit; Beveren, van Peter J.M.

    2017-01-01

    Day-to-night heat storage using water tanks (buffers) is common practice in cold-climate greenhouses, where gas is burned during the day for carbon dioxide enrichment. In this study an optimal control approach is outlined for such a system, based on the idea that the virtual value (shadow price) of

  10. Color the night : applying daytime colors to nighttime imagery

    NARCIS (Netherlands)

    Toet, A.

    2003-01-01

    We present a method to give (fused) multiband night-time imagery a natural day-time color appearance. For input, the method requires a false color RGB image that is produced by mapping 3 individual bands (or the first 3 principal components) of a multiband nightvision system to the respective

  11. FORMULATION AND EVALUATION OF FLOATING MATRIX TABLET OF RANITIDINE HYDROCHLORIDE

    Directory of Open Access Journals (Sweden)

    Himanshu D. Ravat

    2012-05-01

    Full Text Available Ranitidine HCl is used for the H2 receptor antagonist. It is an absorption window limited drug, whosesolubility decreases with increase in the pH and has a short half life of 2-3 h. Therefore the presentinvestigation is concerned with the development of the floating matrix tablets, which after oraladministration were designed to prolong the gastric residence time and thus to increase thebioavailability of the drug and its half life. Ranitidine HCl showed maximum absorption at wavelength324 nm in 0.1N HCl. Drug-polymer compatibility studies by DSC give conformation about their purityand showed no interaction between drug and selected polymers. Various formulations were developedby using release rate controlling and gel forming polymers like HPMC K4 M, and Polyethylene oxideWSR 303 in single by direct compression method with the incorporation of sodium bicarbonate as gasgenerating agent. All the formulations had floating lag time below 4 minutes and constantly floated ondissolution medium for more than 12 h. Swelling studies indicated significant water uptake andcontributed in drug release. From all the developed formulations, batch F5 and F6 prolonged the drugrelease for longer period of time, they were nominated as best formulations. The best formulationsfollowed power law kinetics while the drug release mechanism was found to be diffusion through andpolymer relaxation. The best formulations were found to be stable during stability studies for one month.Thus, best formulations satisfied physico-chemical parameters, floating time, swelling index and in vitrodrug release profile requirements for a floating drug delivery system.

  12. Night-vision goggles for night-blind subjects : subjective evaluation after 2 years of use

    NARCIS (Netherlands)

    Hartong, D. T.; Kooijman, A. C.

    2006-01-01

    Purpose: To evaluate the usefulness of night-vision goggles (NVG) for night-blind subjects after 1 and 2 years of use. Methods: Eleven night-blind subjects with retinitis pigmentosa used NVG for a 2-year period. At the end of each year, they were requested to fill-in two questionnaires regarding the

  13. Why Does Asthma Attack Severely at Night?

    Institute of Scientific and Technical Information of China (English)

    2008-01-01

    @@ The rhythmic changes of human physiological activities by day and at night may cause regular change of the patient's condition within one day. The following is the explanation with the theory of Chinese medicine for the reason why asthma attacks severely at night.

  14. Definitions of night eating in adolescent girls

    NARCIS (Netherlands)

    Striegel-Moore, RH; Thompson, D; Franko, DL; Barton, B; Affenito, S; Schreiber, GB; Daniels, [No Value

    2004-01-01

    Objective: To describe the prevalence of night eating in a community cohort of black and white girls, using different definitions of night eating as described in the literature. Research Methods and Procedures: Three-day food diaries collected as part of the National Growth and Health Study were exa

  15. Definitions of night eating in adolescent girls

    NARCIS (Netherlands)

    Striegel-Moore, RH; Thompson, D; Franko, DL; Barton, B; Affenito, S; Schreiber, GB; Daniels, [No Value

    Objective: To describe the prevalence of night eating in a community cohort of black and white girls, using different definitions of night eating as described in the literature. Research Methods and Procedures: Three-day food diaries collected as part of the National Growth and Health Study were

  16. Night time blood pressure dip

    Institute of Scientific and Technical Information of China (English)

    Dennis; Bloomfield; Alex; Park

    2015-01-01

    The advent of ambulatory blood pressure monitoring permitted examination of blood pressures during sleep and recognition of the associated circadian fall in pressure during this period. The fall in pressure,called the "dip",is defined as the difference between daytime mean systolic pressure and nighttime mean systolic pressure expressed as a percentage of the day value. Ten percent to 20% is considered normal. Dips less than 10%,referred to as blunted or absent,have been considered as predicting an adverse cardiovascular event. This view and the broader concept that white coat hypertension itself is a forerunner of essential hypertension is disputable. This editorial questions whether mean arterial pressures over many hours accurately represent the systolic load,whether nighttime dipping varies from measure to measure or is a fixed phenomenon,whether the abrupt morning pressure rise is a risk factor or whether none of these issues are as important as the actual night time systolic blood pressure itself. The paper discusses the difference between medicated and nonmedicated white coat hypertensives in regard to the cardiovascular risk and suggests that further work is necessary to consider whether the quality and duration of sleep are important factors.

  17. Transfer color to night vision images

    Institute of Scientific and Technical Information of China (English)

    Shaoyuan Sun; Zhongliang Jing; Gang Liu; Zhenhua Li

    2005-01-01

    @@ Natural color appearance is the key problem of color night vision field. In this paper, the color mood of daytime color image is transferred to the monochromic night vision image. This method gives the night image a natural color appearance. For each pixel in the night vision image, the best matching pixel in the color image is found based on texture similarity measure. Entropy, energy, contrast, homogeneity, and correlation features based on co-occurrence matrix are combined as texture similarity measure to find the corresponding pixels between the two images. We use a genetic algorithm (GA) to find the optimistic weighting factors assigned to the five different features. GA is also employed in searching the matching pixels to make the color transfer algorithm faster. When the best matching pixel in the color image is found, the chromaticity values are transferred to the corresponding pixel of the night vision image. The experiment results demonstrate the efficiency of this natural color transfer technique.

  18. Study on Algae Inhibitory Effects by Three Floating-Bed Plant Systems in Eutrophic Water%3种浮床植物系统对富营养化水体中藻类的抑制效果

    Institute of Scientific and Technical Information of China (English)

    周真明; 梅玉龙; 叶青; 沈春花; 赵志领

    2011-01-01

    以叶绿素a、藻类密度表征水体藻类含量,通过静态试验,研究风车草(Cyperus alterni folius)、菖蒲(Acorus clamus)和富贵竹(Dracaena sanderiana)3种浮床植物系统对富营养化水体中藻类的抑制效果.结果表明:风车草、菖蒲和富贵竹对叶绿素a的平均抑制率分别为42.6%,36.7%和18.7%,对藻类密度的平均抑制率分别为45.4%,39.9%和23.3%;3种浮床植物系统对叶绿素a、藻类密度的抑制效果与空白对照组对比存在显著差异(P<0.05).风车草对蓝藻、绿藻、硅藻和铜绿微囊藻的平均抑制率分别40.1%,24.8%,32.3%和29.8%;而菖蒲则分别为38.2%,34.2%,30.1%和27.6%.%Using chlorophyll-a and algae density to quantify algae, the algae inhibitory effects by floating-bed plant systems of Cyperus alternifolius, Acorus calamus and Dracaena sanderiana in eutrophic water were investigated through static experiment.Results show that the average inhibitory rates of chlorophyll-a by three plants are 42.6%, 36.7% and 18.7% respectively, and the average inhibitory rates of algae density are 45.4%, 39.9% and 23.3% respectively.The algae inhibitory effects of the floating-bed systems in chlorophyll-a and algae density are significantly different (P<0.05) for three plants and the blank control The average inhibitory rates of cyanophyta, green algae, diatom and Microcystis aeruginosa by Cyperus alternifolius are 40.1%, 24.8 %, 32.3 % and 29.8 % respectively, and these by Acorus calamus are 38.2%, 34.2%, 30.1% and 27.6% respectively.

  19. Visual range of LLL night vision goggle for drive

    Science.gov (United States)

    Liu, Lei; Chang, Benkang; Li, Wei; Qian, Yunsheng; Fu, Rongguo; Zhong, Zhiyuan

    2002-09-01

    In this paper, the fundamental theory about visual range of LLL imaging system is described. Based on the revised apparent distance detecting equation and combined with the research intention and design principle of night vision goggle, the relation of parameters which have an influence on performances of system are analyzed. The visual range of the goggle under the specific circumstances is estimated, which proves the revised apparent distance detecting equation is effective and the design of the system is feasible.

  20. ASIC Design of Floating-Point FFT Processor

    Institute of Scientific and Technical Information of China (English)

    陈禾; 赵忠武

    2004-01-01

    An application specific integrated circuit (ASIC) design of a 1024 points floating-point fast Fourier transform(FFT) processor is presented. It can satisfy the requirement of high accuracy FFT result in related fields. Several novel design techniques for floating-point adder and multiplier are introduced in detail to enhance the speed of the system. At the same time, the power consumption is decreased. The hardware area is effectively reduced as an improved butterfly processor is developed. There is a substantial increase in the performance of the design since a pipelined architecture is adopted, and very large scale integrated (VLSI) is easy to realize due to the regularity. A result of validation using field programmable gate array (FPGA) is shown at the end. When the system clock is set to 50 MHz, 204.8 μs is needed to complete the operation of FFT computation.

  1. Night vision of the post-LASIK myope

    Directory of Open Access Journals (Sweden)

    R. Hansraj

    2007-01-01

    Full Text Available Purpose: Poor night vision has been reported as one of the side-effects of LASIK,  however, this area has not been widely studied.  This study therefore set out to assess and quantify the visual status of the post-LASIK patient in dim illumination as an indication of visual performance at night.  This was achieved by assessing the night vision threshold, glare vision threshold and glare recovery time.Setting: The study was carried out in Durban, Kwazulu-Natal in South Africa.Method: This study used the Night Sight Meter for assessment of the night vision thresholds, glare vision thresholds and glare  recovery times of individuals who had had LASIK at least one year before commencement of the study.  The inclusion criteria were post-surgical interval following LASIK of at least one year and willingness to participate in the study.  The exclusion criteria included previous ocular surgery other than LASIK, current ocular disease and any systemic illnesses.   One hundred subjects were selected from participating ophthalmologists’ records, using convenience sampling, at different post-operative periods that ranged from 12 to 57 months.  Other refractive findings taken included post-LASIK visual acuity measured using the Snellen Visual Acuity chart and post-LASIK refractive error, measured with the standard subjective refraction tests which included duochrome, Jackson crossed-cylinder and Humphrey’s Immediate Contrast test, which are used for comparison in this study.Results: Post-operatively, the majority of the eyes (89.2% were classified as having ‘poor’ night vision thresholds.  A similar trend was observed in the case of the glare vision thresholds as 84.7% of the eyes fell into the classification of below average.  The degree of pre-operative myopia appears to have an effect on the post-LASIK night vision and glare  thresholds.  Only glare recovery  time was not affected as 51.2% of the subjects displayed good recovery

  2. Floating point software package for use on LSI-11 computers at SLAC

    Energy Technology Data Exchange (ETDEWEB)

    Hendra, R.G.

    1981-06-01

    A floating point software package has been devised to allow full use of the floating point hardware of the LSI-11 and MODEL40 computers. The procedures are written for the most part in the PL-11 language. The package may be run under the RT-11 operating system, or in RAM or EPROM as part of the KERNEL package. The current set of procedures has been run successfully in all three modes.

  3. Algorithm XXX : functions to support the IEEE standard for binary floating-point arithmetic.

    Energy Technology Data Exchange (ETDEWEB)

    Cody, W. J.; Mathematics and Computer Science

    1993-12-01

    This paper describes C programs for the support functions copysign(x,y), logb(x), scalb(x,n), nextafter(x,y), finite(x), and isnan(x) recommended in the Appendix to the IEEE Standard for Binary Floating-Point Arithmetic. In the case of logb, the modified definition given in the later IEEE Standard for Radix-Independent Floating-Point Arithmetic is followed. These programs should run without modification on most systems conforming to the binary standard.

  4. Floating nuclear power plants: potential implications for radioactive pollution of the northern marine environment.

    Science.gov (United States)

    Standring, W J F; Dowdall, M; Amundsen, I; Strand, P

    2009-02-01

    Recent media reports as to the development, construction and possible deployment of floating nuclear power plants in the northern regions has generated significant interest in the matter. This paper presents background to the concept of floating nuclear power plants, information as to possible designs and iterations and some aspects of potential concern with respect to safety and the potential for environmental or other impacts as a result of the development and use of such systems in the northern regions.

  5. Performance Evaluation of a Floating Treatment Wetland in an Urban Catchment

    OpenAIRE

    Peter Nichols; Terry Lucke; Darren Drapper; Chris Walker

    2016-01-01

    Floating Treatment Wetland (FTW) systems are purpose-built devices designed to replicate the water treatment processes that occur in and around naturally occurring floating vegetated islands. FTWs can be used to improve the water quality of water storage ponds by contributing to water treatment processes through adhesion, filtration, nutrient uptake (direct use by plants), and sequestration. This paper presents the results of a twelve-month investigation into the pollution removal performance...

  6. Controlled decoherence of floating flux qubits

    Institute of Scientific and Technical Information of China (English)

    Ji Ying-Hua; Xu Lin

    2010-01-01

    In Born-Markov approximation, this paper calculates the energy relaxation time T1 and the decoherence time T2 of a floating flux qubit by solving the set of Bloch-Redfield equations. It shows that there are two main factors influencing the floating flux qubits: coupling capacitor in the circuit and the environment resistor. It also discusses how to improvethe quantum coherence time of a qubit. Through shunt connecting/series connecting inductive elements, an inductive environment resistor is obtained and further the reactance component of the environment resistor is improved, which is beneficial to the enhancement of decoherence time of floating flux qubits.

  7. Capillary floating and the billiard ball problem

    CERN Document Server

    Gutkin, Eugene

    2010-01-01

    We establish a connection between capillary floating in neutral equilibrium and the billiard ball problem. This allows us to reduce the question of floating in neutral equilibrium at any orientation with a prescribed contact angle for infinite homogeneous cylinders to a question about billiard caustics for their orthogonal cross-sections. We solve the billiard problem. As an application, we characterize the possible contact angles and exhibit an infinite family of real analytic non-round cylinders that float in neutral equilibrium at any orientation with constant contact angles.

  8. A Novel Ideal Floating Inductor Using Translinear Conveyors

    Directory of Open Access Journals (Sweden)

    Iqbal A. Khan

    2003-01-01

    Full Text Available An ideal floating inductor circuit using translinear conveyors is introduced. The floating inductor simulator uses two translinear conveyors and a single capacitor in its realization. The circuit provides the current controlled ideal floating inductance without any component matching constraints. Simulation results on the floating inductor simulator verify the theory

  9. 14 CFR 23.753 - Main float design.

    Science.gov (United States)

    2010-01-01

    ... 14 Aeronautics and Space 1 2010-01-01 2010-01-01 false Main float design. 23.753 Section 23.753... STANDARDS: NORMAL, UTILITY, ACROBATIC, AND COMMUTER CATEGORY AIRPLANES Design and Construction Floats and Hulls § 23.753 Main float design. Each seaplane main float must meet the requirements of § 23.521. ...

  10. Produção de mudas de espécies forrageiras no sistema hidropônico de leito flutuante (floating com solução nutritiva à base de biofertilizante ou adubo solúvel = Production of seedlings of forage species in floating hydroponics system with biofertilizer or soluble fertilizer

    Directory of Open Access Journals (Sweden)

    Ricardo Probst

    2009-10-01

    Full Text Available Neste trabalho objetivou-se avaliar a sobrevivência das estacas e a produção de matéria seca na fase de cultivo de mudas das espécies forrageiras missioneira gigante (Axonopus catharinensis, amendoim forrageiro (Arachis pintoi e maku (Lotus uliginosus cv. Maku. No sistema hidropônico de leito flutuante com solução nutritiva à base de biofertilizante ou adubo solúvel. O delineamento experimental adotado foi o de blocos ao acaso em esquema fatorial 3 x 2, sendo três espécies forrageiras e duas soluções nutritivas. As espécies não apresentaram diferença quanto à sobrevivência (p = 0,225, independentemente do tipo de fertilizante (p = 0,92. No entanto, quando se quantificou a produção de MS planta-1 proporcionada por cada uma dessas espécies, o maku (p = 0,001 obteve as maiores quantidades (47,18 g, enquanto o amendoim forrageiro (19,90 g e a missioneira gigante (16,81 g foram semelhantes entre si (p = 0,227, tendo o mesmo ocorrido entre os fertilizantes (p = 0,559. Deste modo, as três espécies possuem condições semelhantes de sobrevivência, independentemente da concentração de nutrientes da solução nutritiva, com o maku proporcionando a maior produção de MS planta-1.The aim of this work was to evaluate the survival and dry matter production during the seedling culture phase of three forage species: Axonopus catharinensis, forage peanut (Arachis pintoi, and greater lotus (Lotus uliginosus cv. Maku, in a floating hydroponic system using biofertilizer or soluble fertilizer. The experimental design adopted was randomized blocks in a 3 x 2 factorial scheme, with three forage species and two fertilizers. There was no difference between species with regard to survival (p = 0.225, regardless of the fertilizer used (p = 0.92. However, when dry matter production was considered, Maku (P=0,001 showed greater weight (47.18 g, while there was no difference (p = 0.227 in weight between Arachis pintoi (19.90 g and Axonopus

  11. Design of Floating-point DSP Experimental Teaching System based on ADSP-21369%基于ADSP-21369的浮点DSP实验教学系统设计

    Institute of Scientific and Technical Information of China (English)

    韩赛; 杜普选

    2012-01-01

    This paper focused on the research and design of Floating-point DSP Experimental Teaching System based on ADSP-21369. It was implemented the control of SDRAM, FLASH, ADC, DDS and other external memory by ADSP-21369 and other analog devices. LCD, UART and keyboard could be controlled by using ADSP-21369's inherent resources and the digital peripheral interface (DPI). The digital application interface (DAI) could be used to control the audio, S/PDIF and LED.%本文研究并设计出一套基于ADSP-21369的浮点DSP教学实验系统.采用ADSP-21369处理器,辅以其它模拟器件,实现对SDRAM,FLASH,ADC和DDS等外部存储器的控制.利用ADSP-21369的固有资源,通过数字外设接口(DPI)完成对LCD,UART及键盘控制,通过数字应用接口(DAI)完成对音频,S/PDIF和LED灯等的控制.

  12. Night sky a falcon field guide

    CERN Document Server

    Nigro, Nicholas

    2012-01-01

    Night Sky: A Falcon Field Guide covers both summer and winter constellations, planets, and stars found in the northern hemisphere. Conveniently sized to fit in a pocket and featuring detailed photographs, this informative guide makes it easy to identify objects in the night sky even from one's own backyard. From information on optimal weather conditions, preferred viewing locations, and how to use key tools of the trade, this handbook will help you adeptly navigate to and fro the vast and dynamic nighttime skies, and you'll fast recognize that the night sky's the limit.

  13. Passive cooling by night-time ventilation using climate responsive elements - Annual report 2007

    Energy Technology Data Exchange (ETDEWEB)

    Artmann, N.

    2007-07-01

    This illustrated annual report for the Swiss Federal Office of Energy (SFOE) reports on the work done at the Swiss Federal Laboratories for Materials Science and Technology EMPA in 2007 on the subject of passive cooling systems. The paper reports on the evaluation of the possibilities and limitations of passive cooling using night-time ventilation. The climatic potential for the passive cooling of buildings using such night-time ventilation was evaluated. The author reports that the results show a very high potential for night-time cooling over the whole of Northern Europe and a still significant potential in Central, Eastern and even some regions of Southern Europe. Furthermore, a significant reduction in the potential for night cooling was found due to climate change. Although its potential might not always be sufficient to assure thermal comfort, night-time ventilation can still be used to reduce the cooling energy demand in buildings using hybrid systems.

  14. Shipwreck! The floating inferno: Yarmouth Castle

    National Research Council Canada - National Science Library

    Armstrong, J; Ramer, H

    1998-01-01

    The Yarmouth Castle embarked on an overnight trip from Miami to the Bahamas every weekend - until November, 1965, when this midnight cruise to paradise became a floating inferno that left 87 passengers dead...

  15. Physical model tests for floating wind turbines

    DEFF Research Database (Denmark)

    Bredmose, Henrik; Mikkelsen, Robert Flemming; Borg, Michael

    Floating offshore wind turbines are relevant at sites where the depth is too large for the installation of a bottom fixed substructure. While 3200 bottom fixed offshore turbines has been installed in Europe (EWEA 2016), only a handful of floating wind turbines exist worldwide and it is still...... an open question which floater concept is the most economically feasible. The design of the floaters for the floating turbines relies heavily on numerical modelling. While several coupled models exist, data sets for their validation are scarce. Validation, however, is important since the turbine behaviour...... is complex due to the combined actions of aero- and hydrodynamic loads, mooring loads and blade pitch control. The present talk outlines two recent test campaigns with a floating wind turbine in waves and wind. Two floater were tested, a compact TLP floater designed at DTU (Bredmose et al 2015, Pegalajar...

  16. The floating city as an ecosystem

    NARCIS (Netherlands)

    Van Uffelen, C., Rentmeester, S.

    2015-01-01

    Floating construction: several municipalities in the Netherlands are working with it on a small scale. TU Delft alumnus Rutger de Graaf of the YesDelft company DeltaSync would like to speed things up with his Blue Revolution.

  17. Video-OCS Floating Wind Farm Site

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This data release contains digital video files from the USGS field activity 2014-607-FA, a survey of the Oregon Outer Continental Shelf (OCS) Floating Wind Farm Site...

  18. Genetics Home Reference: Floating-Harbor syndrome

    Science.gov (United States)

    ... child may have bones more typical of a child of 2. However, bone age is usually normal by age 6 to 12. Delay in speech development (expressive language delay) may be severe in Floating-Harbor syndrome , ...

  19. A floating water bridge produces water with excess charge

    Science.gov (United States)

    Fuchs, Elmar C.; Sammer, Martina; Wexler, Adam D.; Kuntke, Philipp; Woisetschläger, Jakob

    2016-03-01

    Excess positive and negative Bjerrum-defect like charge (protonic and ‘aterprotonic’, from ancient Greek ἄ'τɛρ, ‘without’) in anolyte and catholyte of high voltage electrolysis of highly pure water was found during the so-called ‘floating water bridge’ experiment. The floating water bridge is a special case of an electrohydrodynamic liquid bridge and constitutes an intriguing phenomenon that occurs when a high potential difference (~kV cm-1) is applied between two beakers of water. To obtain such results impedance spectroscopy was used. This measurement technique allows the depiction and simulation of complex aqueous systems as simple electric circuits. In the present work we show that there is an additional small contribution from the difference in conductivity between anolyte and catholyte which cannot be measured with a conductivity meter, but is clearly visible in an impedance spectrum.

  20. Quantitative Comparison of the Responses of Three Floating Platforms

    Energy Technology Data Exchange (ETDEWEB)

    Jonkman, J.; Matha, D.

    2010-03-01

    This report presents a comprehensive dynamic-response analysis of three offshore floating wind turbine concepts. Models were composed of one 5-MW turbine supported on land and three 5-MW turbines located offshore on a tension leg platform, a spar buoy, and a barge. A loads and stability analysis adhering to the procedures of international design standards was performed for each model using the fully coupled time-domain aero-hydro-servo-elastic design code FAST with AeroDyn and HydroDyn. The concepts are compared based on the calculated ultimate loads, fatigue loads, and instabilities. The results of this analysis will help resolve the fundamental design trade-offs between the floating-system concepts.

  1. Proton production, neutralisation and reduction in a floating water bridge

    Science.gov (United States)

    Sammer, Martina; Wexler, Adam D.; Kuntke, Philipp; Wiltsche, Helmar; Stanulewicz, Natalia; Lankmayr, Ernst; Woisetschläger, Jakob; Fuchs, Elmar C.

    2015-10-01

    This work reports on proton production, transport, reduction and neutralization in floating aqueous bridges under the application of a high dc voltage (‘floating water bridge’). Recently possible mechanisms for proton transfer through the bridge were suggested. In this work we visualize and describe the production of protons in the anolyte and their neutralization in the catholyte. Apart from that, protons are reduced to hydrogen due to electrolysis. Microbubbles are detached instantly, due to the electrohydrodynamic flow at the electrode surface. No larger, visible bubbles are formed and the system degasses through the bridge due to its higher local temperature. A detailed analysis of trace elements originating from beaker material, anode or the atmosphere is presented, showing that their influence on the overall conduction compared to the contribution of protons is negligible. Finally, an electrochemical rationale of high voltage electrolysis of low ionic strength solutions is presented.

  2. Genetic Algorithms, Floating Point Numbers and Applications

    Science.gov (United States)

    Hardy, Yorick; Steeb, Willi-Hans; Stoop, Ruedi

    The core in most genetic algorithms is the bitwise manipulations of bit strings. We show that one can directly manipulate the bits in floating point numbers. This means the main bitwise operations in genetic algorithm mutations and crossings are directly done inside the floating point number. Thus the interval under consideration does not need to be known in advance. For applications, we consider the roots of polynomials and finding solutions of linear equations.

  3. Verified Compilation of Floating-Point Computations

    OpenAIRE

    Boldo, Sylvie; Jourdan, Jacques-Henri; Leroy, Xavier; Melquiond, Guillaume

    2015-01-01

    International audience; Floating-point arithmetic is known to be tricky: roundings, formats, exceptional values. The IEEE-754 standard was a push towards straightening the field and made formal reasoning about floating-point computations easier and flourishing. Unfortunately, this is not sufficient to guarantee the final result of a program, as several other actors are involved: programming language, compiler, architecture. The CompCert formally-verified compiler provides a solution to this p...

  4. Travel Time Estimation Using Floating Car Data

    CERN Document Server

    Sevlian, Raffi

    2010-01-01

    This report explores the use of machine learning techniques to accurately predict travel times in city streets and highways using floating car data (location information of user vehicles on a road network). The aim of this report is twofold, first we present a general architecture of solving this problem, then present and evaluate few techniques on real floating car data gathered over a month on a 5 Km highway in New Delhi.

  5. Capillary floating and the billiard ball problem

    OpenAIRE

    Gutkin, Eugene

    2010-01-01

    We establish a connection between capillary floating in neutral equilibrium and the billiard ball problem. This allows us to reduce the question of floating in neutral equilibrium at any orientation with a prescribed contact angle for infinite homogeneous cylinders to a question about billiard caustics for their orthogonal cross-sections. We solve the billiard problem. As an application, we characterize the possible contact angles and exhibit an infinite family of real analytic non-round cyli...

  6. Floating wetlands for urban stormwater treatment

    OpenAIRE

    Wang, Chih-Yu

    2013-01-01

    A floating treatment wetland (FTW) is an ecological approach which seeks to reduce point and nonpoint source pollution by installing substrate rooted plants grown on floating mats in open waters. While relatively novel, FTW use is increasing. A review of literature identified several research gaps, including: (1) assessments of the treatment performance of FTWs; (2) evaluations of FTWs in the U.S., particularly within wet ponds that receive urban runoff; and (3) plant temporal nutrient distri...

  7. Smartphones May Hinder a Good Night's Sleep

    Science.gov (United States)

    ... page: https://medlineplus.gov/news/fullstory_161924.html Smartphones May Hinder a Good Night's Sleep Study suggests ... sleep, it might be wise to give your smartphone a rest from time to time. New research ...

  8. TBT recommends : Courtney Pine. Hansa disco night

    Index Scriptorium Estoniae

    2005-01-01

    Inglise jazzsaksofonisti Courtney Pine heliplaadi "Resistance" esitluskontserdist 15. dets. Rock Cafés Tallinnas. Inglise laulja Chris Norman läti ansamblitega üritusel "Hansa disco night Nr.4" 9. dets. Kipsala Hallis Riias

  9. TBT recommends : Courtney Pine. Hansa disco night

    Index Scriptorium Estoniae

    2005-01-01

    Inglise jazzsaksofonisti Courtney Pine heliplaadi "Resistance" esitluskontserdist 15. dets. Rock Cafés Tallinnas. Inglise laulja Chris Norman läti ansamblitega üritusel "Hansa disco night Nr.4" 9. dets. Kipsala Hallis Riias

  10. Floating microparticles based on low density foam powder.

    Science.gov (United States)

    Streubel, A; Siepmann, J; Bodmeier, R

    2002-07-25

    The aim of this study was to develop a novel multiparticulate gastroretentive drug delivery system and to demonstrate its performance in vitro. Floating microparticles consisting of (i) polypropylene foam powder; (ii) verapamil HCl as model drug; and (iii) Eudragit RS, ethylcellulose (EC) or polymethyl methacrylate (PMMA) as polymers were prepared with an O/W solvent evaporation method. The effect of various formulation and processing parameters on the internal and external particle morphology, drug loading, in vitro floating behavior, in vitro drug release kinetics, particle size distribution and physical state of the incorporated drug was studied. The microparticles were irregular in shape and highly porous. The drug encapsulation efficiency was high and almost independent of the theoretical loading. Encapsulation efficiencies close to 100% could be achieved by varying either the ratio 'amount of ingredients: volume of the organic phase' or the relative amount of polymer. In all cases, good in vitro floating behavior was observed. The release rate increased with increasing drug loading and with decreasing polymer amounts. The type of polymer significantly affected the drug release rate, which increased in the following rank order: PMMAsystem.

  11. Nature's Late-Night Light Shows

    Science.gov (United States)

    Peterson, Carolyn Collins

    2002-09-01

    In addition to stars and planets, there are other interesting lights to be seen in the night sky. The northern and southern lights, called the aurora borealis and aurora australis, are created by charged particles from the Sun reacting in Earth's magnetic field. Night-shining clouds or noctilucent clouds appear at evening twilight as a result of water vapor in the polar mesosphere. Zodiacal light can be seen stretching up from the horizon after sunset or before sunrise.

  12. Analysis and optimization of electromagnetic force compensation device for air floating suspension system%气浮悬挂系统电磁力补偿装置分析及优化

    Institute of Scientific and Technical Information of China (English)

    单晓杭; 黄航航

    2016-01-01

    针对气浮悬挂装置运动过程中的气压波动和惯性力补偿问题,提出一种电磁力补偿装置,通过钕铁硼磁体产生磁场,设计了合理的磁路。应用Maxwell对该装置进行磁场仿真,通过对比及分析,优化了导磁材料的尺寸和结构,使有效行程内气隙中磁感应强度保持恒定,控制线圈回路中的电流产生需要的电磁力,补偿气压力与目标力的差值和惯性力。%Aiming at air pressure fluctuation and redundant inertia force caused by the motion of air floating suspension system, this article proposes a electromagnetic force compensation device. NdFeB magnet was used for designing a proper magnetic circuit to generate magnetic field. Maxwell was used for simulating and analyzing the magnetic circuit of this mechanism. By comparison and analysis, the structures and sizes of magnetic conductive material was optimized, which can keep the same value of magnetic induction in the air gap within the effective stroke. This system can compensate the force difference between air pressure and desired firce and inertia force by controlling the current flowing though the coils.

  13. Working at Night in Hospital Environment is a Risk Factor for Arterial Stiffness

    Directory of Open Access Journals (Sweden)

    Sinem Özbay

    2012-09-01

    Full Text Available Aim: Arterial stiffness is an independent risk factor for cardiovascular disease. In previous studies, emotional stress has been reported to be a risk factor for cardiovascular disease. In this study, we aimed to investigate the effects of anxiety, stress and fatigue associated with working at night in hospital environment on arterial stiffness in physicians. Methods: The study was carried out with 30 physicians employed in Medical Faculty of Uludağ University between October 2011 and March 2012. Measurements were made using Pulse Wave Sensor HDI system (Hypertension Diagnostics Inc, Eagan, MN(Set No: CR000344 by radial artery pulse wave at the onset and end of night shift. Results: The mean age of night doctors included in the study was 26 years (range: 22-38 and the female/male ratio was 2/1. It was determined that mean values of arterial stiffness were significantly higher after night shift (1330±360 dyne/sn/cm-5 compared to mean values before night shift (1093±250 dyn/s/cm-5 (p=0.01. In the evaluation of other parameters before and after night shift, no statistically significant difference was detected (p>0.05. Conclusion: The increasing arterial stiffness in hospital employees after night shift could be attributed to the effects of stress and fatigue experienced during night shift. (The Me di cal Bul le tin of Ha se ki 2012; 50: 93-5

  14. Transportation of Floating Structures by Using Newly Built Heavy Lifting Semi Vessel HYSY278

    Institute of Scientific and Technical Information of China (English)

    SUN Wei-ying; ZHANG Da-gang; FAN Zhi-xia

    2013-01-01

    Transportation of floating structures for long distance has always been associated with the use of heavy semi transport vessel.The requirements of this type of vessel are always special,and its availability is limited.To prepare for the future development of the South China Sea deepwater projects,COOEC has recently built a heavy lift transport vessel-Hai Yang Shi You 278 (HYSY278).This semi-submersible vessel has displacement capacity of 50k DWT,and a breath of 42 m.Understanding the vessel's applicability and preparing its use for future deepwater projects are becoming imminent need.This paper reviews the critical issues associated with the floating structure transportation and performs detailed analysis of two designed floating structures during transportation.The newly built COOEC transportation vessel HYSY278 will be used to dry transport the floating structures from COOEC fabrication yard in Qingdao to the oil field in the South China Sea.The entire process will start with load-out/float-offthe floating structures from the construction sites,offload the platform from the vessel if needed,dry transport floating structures through a long distance,and finally offload the platform.Both hydrodynamic and structural analyses are performed to evaluate transport vessel and floating structures.Critical issues associated with the transportation and offloading of platform from the vessel will be studied in detail.Detailed study is performed to evaluate the response of the system during this phase and additional work needed to make the vessel feasible for use of this purpose.The results demonstrate that with proper modifications,HYSY278 can effectively be used for transporting structures with proper arrangement and well-prepared operation.The procedure and details are presented on the basis of study results.Special attentions associated with future use will also be discussed based on the results from analysis.

  15. Formulation and evaluation of floating tablets of niacin for sustained release

    Directory of Open Access Journals (Sweden)

    Haripriya Puthoori

    2012-01-01

    Full Text Available Niacin or nicotinic acid (NA is used in the treatment of hyperlipidemia. NA immediate release formulation shows undesirable effects like flushing of the face and neck parts. In the present study, NA floating sustained release dosage form was developed to prolong the drug release, to retain the drug delivery system above the site of absorption for the desired period of time, and to reduce the drug release rate compared to conventional formulations in order to minimize the side effects. The preformulation parameters such as flow properties and drug-excipient compatibility studies were performed. The drug excipient compatibility studies were performed using the FTIR study and the results showed that all the polymers used in the study are compatible with the pure drug. The floating sustained release tablets of niacin were prepared by the wet granulation method and the granules were evaluated for various micromeritic properties like bulk density, tapped density, Carr′s Index, Hausner′s ratio, and angle of repose. The tablets were evaluated for post-compressional parameters like average weight, thickness, hardness, friability, swelling index, floating lag time and total floating time, and in vitro drug release studies. All the formulations showed total floating time >20 hr. The concentration of the effervescent agent and the concentration and type of polymer showed an effect on the floating behavior and drug release. The formulation containing 13% sodium bicarbonate, HPMC (33% and Eudragit RS PO (4% showed required drug release up to 20 hr.

  16. What's crucial in night vision goggle simulation?

    Science.gov (United States)

    Kooi, Frank L.; Toet, Alexander

    2005-05-01

    Training is required to correctly interpret NVG imagery. Training night operations with simulated intensified imagery has great potential. Compared to direct viewing with the naked eye, intensified imagery is relatively easy to simulate and the cost of real NVG training is high (logistics, risk, civilian sleep deprivation, pollution). On the surface NVG imagery appears to have a structure similar to daylight imagery. However, in actuality its characteristics differ significantly from those of daylight imagery. As a result, NVG imagery frequently induces visual illusions. To achieve realistic training, simulated NVG imagery should at least reproduce the essential visual limitations of real NVG imagery caused by reduced resolution, reduced contrast, limited field-of-view, the absence of color, and the systems sensitivity to nearby infrared radiation. It is particularly important that simulated NVG imagery represents essential NVG visual characteristics, such as the high reflection of chlorophyll and halos. Current real-time simulation software falls short for training purposes because of an incorrect representation of shadow effects. We argue that the development of shading and shadowing merits priority to close the gap between real and simulated NVG flight conditions. Visual conspicuity can be deployed as an efficient metric to measure the 'perceptual distance' between the real NVG and the simulated NVG image.

  17. Floating-to-Fixed-Point Conversion for Digital Signal Processors

    Directory of Open Access Journals (Sweden)

    Menard Daniel

    2006-01-01

    Full Text Available Digital signal processing applications are specified with floating-point data types but they are usually implemented in embedded systems with fixed-point arithmetic to minimise cost and power consumption. Thus, methodologies which establish automatically the fixed-point specification are required to reduce the application time-to-market. In this paper, a new methodology for the floating-to-fixed point conversion is proposed for software implementations. The aim of our approach is to determine the fixed-point specification which minimises the code execution time for a given accuracy constraint. Compared to previous methodologies, our approach takes into account the DSP architecture to optimise the fixed-point formats and the floating-to-fixed-point conversion process is coupled with the code generation process. The fixed-point data types and the position of the scaling operations are optimised to reduce the code execution time. To evaluate the fixed-point computation accuracy, an analytical approach is used to reduce the optimisation time compared to the existing methods based on simulation. The methodology stages are described and several experiment results are presented to underline the efficiency of this approach.

  18. ACECLOFENAC FLOATING TABLETS - A PROMISING SUSTAINED RELEASE DOSAGE FORM

    Directory of Open Access Journals (Sweden)

    Ambati Brahma reddy

    2011-06-01

    Full Text Available The purpose of the present study was to develop an optimized gastric floating drug delivery system (GFDDS containing Aceclofenac as a model drug by using various proportion of polymers such as HPMC E5M and Eudragit RS 100. This was employed to enhance the bioavailability and therapeutic efficacy of the drug. The sustained release formulations of aceclofenac using hydrophobic and hydrophilic polymers were prepared by direct compression method. Optimization of formulation was done by studying effect of drug to polymer ratio on drug release. FT- IR studies indicated absence of any interaction between aceclofenac, polymer (Eudragit RS 100, HPMCE5M and excipients. Five formulations were prepared and formulation A5 possessed good floating property with total floating time between 8-10 hours. The tablets were also evaluated for its hardness, friability and other In- vitro evaluation tests. All parameters complied with IP limits. Results of this study indicated that the combinations of hydrophilic polymers with hydrophobic polymers are suitable to optimize sustained release formulation of aceclofenac.

  19. Providing floating capabilities in latest-generation sand screens

    Energy Technology Data Exchange (ETDEWEB)

    Bowen, E.G.; Coronado, M.P. [Society of Petroleum Engineers, Richardson, TX (United States)]|[Baker Hughes, Houston, TX (United States)

    2008-10-15

    Alternative production methods are needed for the massive reserves located in the bitumen region of Canada's tar sands. The area has over 100 installations of sand screens/slotted liners in both injection and production legs using steam-assisted gravity drainage (SAGD) technology. Multiple wells must be drilled from a single pad because of the sensitive nature of the environment. With significant depths of these wells, a floating sand screen provides assurance that the sand screen will reach the desired depth. Paraffin is generally used to plug the flow access of the screen during installation. This paper discussed a new technology that has been developed to allow for sand screen installations without relying on paraffin wax to withstand differential pressure. The new technology uses a hydro-mechanical valving system incorporated into the screen design to temporarily close off the screen while being run in the hole. The paper described how the technology could provide a reliable, time-saving solution for SAGD installations when floating sand control screens are needed. The paper discussed current technology and its limitations, sand screen installation, screen design for floating applications, and additional applications. It was concluded that this technology solution provides a unique alternative to the methods currently used to install sand screens with SAGD technology in the fast growing Canadian market for bitumen recovery. 2 refs., 5 figs.

  20. Cascade Analysis of a Floating Wind Turbine Rotor

    Science.gov (United States)

    Eliassen, Lene; Jakobsen, Jasna B.; Knauer, Andreas; Nielsen, Finn Gunnar

    2014-12-01

    Mounting a wind turbine on a floating foundation introduces more complexity to the aerodynamic loading. The floater motion contains a wide range of frequencies. To study some of the basic dynamic load effect on the blades due to these motions, a two-dimensional cascade approach, combined with a potential vortex method, is used. This is an alternative method to study the aeroelastic behavior of wind turbines that is different from the traditional blade element momentum method. The analysis tool demands little computational power relative to a full three dimensional vortex method, and can handle unsteady flows. When using the cascade plane, a "cut" is made at a section of the wind turbine blade. The flow is viewed parallel to the blade axis at this cut. The cascade model is commonly used for analysis of turbo machineries. Due to the simplicity of the code it requires little computational resources, however it has limitations in its validity. It can only handle two-dimensional potential flow, i.e. including neither three-dimensional effects, such as the tip loss effect, nor boundary layers and stall effects are modeled. The computational tool can however be valuable in the overall analysis of floating wind turbines, and evaluation of the rotor control system. A check of the validity of the vortex panel code using an airfoil profile is performed, comparing the variation of the lift force, to the theoretically derived Wagner function. To analyse the floating wind turbine, a floating structure with hub height 90 m is chosen. An axial motion of the rotor is considered.

  1. An experimental substantiation of the emergency cooldown system project for the KLT-40S reactor installation of a floating nuclear cogeneration station

    Science.gov (United States)

    Balunov, B. F.; Shcheglov, A. A.; Il'in, V. A.; Saikova, E. N.; Bol'Shukhin, M. A.; Bykh, O. A.; Khizbullin, A. M.; Sokolov, A. N.

    2011-05-01

    Results from thermal-hydraulic tests of a full-scale module of the emergency cooldown system for a KLT-40S reactor installation are presented. The validity of the solutions adopted in its design is shown. Recommendations for calculating the heat transfer coefficients during steam flow condensation and condensate cooling are given.

  2. Evaluation of three types of structured floating plastic media in moving bed biofilters for total ammonia nitrogen removal in a low salinity hatchery recirculating aquaculture system

    Science.gov (United States)

    Three different commercially available structural plastic media were evaluated in triplicate in moving bed toriod filters under low salinity (11-12 ppt) warm water culture conditions and two different feed loading rates. The culture system consisted of nine separate modules that include a double dra...

  3. [Free-Floating Intraocular Cysts].

    Science.gov (United States)

    Werner, Jens Ulrich; Lang, Gerhard K; Enders, Christian

    2017-05-03

    Background Free-floating intraocular cysts may be found in the anterior chamber (FZV) and the vitreous (FZG). The first description of a cyst was 150 years ago, and they are considered to be ocular rarities. Materials and Methods The actual knowledge about FZV and FZG is shown on the basis of two exemplary patients. Results and Discussion Patient 1 had a FZV as an incidental finding which had a smooth surface, a slight pigmentation and was translucent. The ultrasound biomicroscopy revealed an echo-free interior space. Without the patient's discomfort and missing treatment indication, a watch-and-wait strategy was chosen. Cysts of the iris can be classified as primary and secondary cysts. Primary cysts of the iris can arise from the stroma as the pigment epithelium wherein it is believed that FZV descend from the pigment epithelium. Secondary cysts and FZV can be generated by tumors, inflammation, epithelial ingrowth, the use of eye-drops or intraocular foreign bodies. Patient 2 showed marked myopic fundus changes and an FZG with a yellowish-greenish surface; the transparency was reduced and the surface was not pigmented. The ultrasound examination also revealed an echo-free interior space. Clinical controls were advised. Congenital and acquired causes are discussed for the formation of FZG. FZG could originate from the pigment epithelium of the iris, but there are conflicting study results. Trauma, inflammation and chorioretinal diseases are considered as a reason for acquired causes of FZG. The genesis, especially of FZG, is still unclear. For the treatment of patients with FZV and FZG, it is important to know the potential causes to be able to make a therapeutic decision. High quality photographic and sonographic documentation is needed in the watch-and-wait strategy. Georg Thieme Verlag KG Stuttgart · New York.

  4. Floating geomembrane cover improves biogas collection

    Energy Technology Data Exchange (ETDEWEB)

    McMahon, J.

    2009-07-15

    Canadian corn products refiner, Casco Inc., recently upgraded a wastewater anaerobic digester at its automated corn wet milling facility on the St. Lawrence River, in Cardinal Ontario. The upgrade includes an improved floating and insulated geomembrane cover, designed and installed by Geomembrane Technologies Inc. The cover effectively streamlines biogas collection, improves biogas odour control and optimizes bioreactor heat retention. Casco's bulk volume fermenter (BVF) was designed and built in 1988 by ADI Systems Inc. It is limited to receiving 641,000 gallons of wastewater per day from several areas of the plant. Wastewater sludge is usually treated by anaerobic digestion. At Casco, raw solids are added directly to the BVF bioreactor, where they are digested, minimizing waste sludge handling. In essence, anaerobic digestion is a renewable energy source which converts wastewater to a methane- and carbon dioxide-rich biogas suitable for energy production, replacing fossil fuels. The insulated geomembrane cover captures and reclaims all the biogas from the treatment process that is going on inside the tank. Without a cover, the biogas would be released to the atmosphere. The new geomembrane cover collects an average of 236,000 cubic feet of biogas per day, at a 65 per cent methane concentration, from the BVF bioreactor. 2 figs.

  5. 一种新型浮式钻井生产储油装卸系统的模型实验%MODEL TEST OF FLOATING DRILLING PRODUCTION STORAGE AND OFFLOADING SYSTEMS

    Institute of Scientific and Technical Information of China (English)

    雷松; 岳前进; 赵岩; 谢彬; 喻西崇

    2012-01-01

    从一种新型浮式钻井生产储油装卸系统(FDPSO)的概念设计出发,针对干式井口甲板垂直方向的相对运动问题,建立了系统的简化理论模型,运用半物理仿真的方法搭建了实验平台,根据船体的垂荡响应谱确定简谐激励的实验工况,实验和数值结果相吻合,系列实验结果表明这种FDPSO的设计对船体的垂荡运动具有自动补偿作用,减小了干式井口甲板的运动振幅.%The relative motion problem in the vertical direction is proposed, originating from the conceptual design of a new type floating drilling production and an offloading system. The theoretical model is established by decoupling the motions of the hull and dry wellhead deck, and the indoor test platform is built using the semi-physical simulation method. The feasible test scheme is determinated according to hull heave response spectrum.Under the harmonic excitation, the experimental results agreed with numerical results perfectly. A series of tests show that this type of FDPSO is designed with automatic compensation of hulls heave motion, enormously reducing the amplitude of dry wellhead deck, and that it is benefit to deepwater production and drilling work.

  6. Design of Sea Heave Motion Simulation System for Float Drilling Platform%浮式钻井平台升沉模拟系统设计

    Institute of Scientific and Technical Information of China (English)

    姜浩; 刘衍聪; 张彦廷; 刘振东

    2012-01-01

    设计电液比例阀控制非对称油缸模拟钻井平台升沉运动的实验系统,建立阀控缸的动态方程并用Matlab进行仿真.设计测控系统并采用PID和死区P控制相结合的方法控制比例阀,有效减小了死区对控制精度的影响.实验结果表明,该模拟系统可实现较高精度的位移跟踪.%The simulation system of electro-hydraulic proportional valve-control asymmetric cylinder For heave motion of drilling platform was designed. According to mathematic models, the simulation was carried out by using Matlab software. The measure and control system was designed and the influence of nonlinear dead band of electro-hydraulic proportional valve was decreased efficiently by using PID control algorithm and dead band P control. The testing data show that the simulation system can realize precise displacement tracking.

  7. Supportive leadership in Swedish community night nursing.

    Science.gov (United States)

    Gustafsson, Christine; Fagerberg, Ingegerd; Asp, Margareta

    2010-10-01

    The aim of the present study was to examine the support night nurses' give to staff in community night nursing. Studies have shown that support given to staff is one of night registered nurses' (RNs') experiences of the meaning of caring. This support, that community RNs display for staff in night-time care, is sparsely described. All community night-duty nurses in a medium-sized municipal in Sweden participated in the present study. Thematic content analysis was used to analyse data from observations. The support given by RNs to staff is described using three themes: (1) a conditional supporting stance, (2) preparing propitious conditions for caring and (3) confidence in the abilities of individual staff members and adaptation to their individual needs. The results reveal that RNs consider support to staff in terms of nursing leadership. Out of 'concern for the staff' the RNs try to be there for them, which corresponds to nursing leadership. Such concern also arises from the RNs' awareness that by giving support to staff this affects the staffs' caring for older people. The current municipal social care organization of community nursing of older people in which RNs have extensive responsibilities with insufficient control, is a working condition with a risk for decreased quality of care and a high risk for work-related stress syndrome. © 2010 The Authors. Journal compilation © 2010 Blackwell Publishing Ltd.

  8. Formulation and evaluation of different floating tablets containing metronidazole to target stomach.

    Science.gov (United States)

    Loh, Zhiao C; Elkordy, Amal A

    2015-01-01

    The purpose of this study is to formulate and develop tablets dosage form containing Metronidazole which has swelling and floating properties as a gastroretentive controlled-release drug delivery system to improve drug bioavailability. Fifteen different formulations of effervescence-forming floating systems were designed using HPMC K15M, xanthan gum, co-povidone, Eudragit® RL PO, pluronic® F-127 and/or polypropylene foam powder as swelling agents and sodium bicarbonate with/ without citric acid as gas-forming agents at different compositions. Six out of these 15 formulations which have satisfactory tablet floating behaviour were further studied with the incorporation of Metronidazole. The tablets were evaluated based on tablet physicochemical properties, floating behaviour, swelling ability and drug dissolution studies which were carried out using 0.1M HCl at 37°C for 8 hours. Furthermore, evaluation of the powder mixtures using Fourier transform infrared (FT-IR) spectroscopy, differential scanning calorimetry (DSC) and scanning electron microscope (SEM) were investigated. Most of the tablets show good physicochemical properties except for F11 which contains pluronic® F-127 as its release-retarding matrix-forming polymer. Other formulations show high swelling capacity, ability to float for at least 8 hours in vitro and have sustained drug release characteristics. Data obtained indicated that F3 which contains HPMC (12.5%w/w), xanthan gum (25%w/w), co-povidone (12.5%w/w) and sodium bicarbonate (31.7%w/w) is a suitable formulation with short floating lag time, good floating behaviour and sustained drug release for at least 8 hours in vitro with a zero order kinetic. Combinations of HPMC K15M and xanthan gum as swelling agents show synergistic effect in retarding drug release and are suitable in providing the most sustained drug release system.

  9. On the dynamics of floating structures

    CERN Document Server

    Lannes, David

    2016-01-01

    This paper addresses the floating body problem which consists in studying the interaction of surface water waves with a floating body. We propose a new formulation of the water waves problem that can easily be generalized in order to take into account the presence of a floating body. The resulting equations have a compressible-incompressible structure in which the interior pressure exerted by the fluid on the floating body is a Lagrange multiplier that can be determined through the resolution of a $d$-dimensional elliptic equation, where $d$ is the horizontal dimension. In the case where the object is freely floating, we decompose the hydrodynamic force and torque exerted by the fluid on the solid in order to exhibit an added mass effect; in the one dimensional case $d=1$, the computations can be carried out explicitly. We also show that this approach in which the interior pressure appears as a Lagrange multiplier can be implemented on reduced asymptotic models such as the nonlinear shallow water equations an...

  10. Formulation and optimization of carbamazepine floating tablets

    Directory of Open Access Journals (Sweden)

    Patel D

    2007-01-01

    Full Text Available Floating tablets of carbamazepine were developed using melt granulation technique. Bees wax was used as a hydrophobic meltable material. Hydroxypropylmethylcellulose, sodium bicarbonate and ethyl cellulose were used as matrixing agent, gas-generating agent and floating enhancer, respectively. The tablets were evaluated for in vitro buoyancy and dissolution studies. A simplex lattice design was applied to investigate the combined effect of 3 formulation variables i.e. amount of hydroxypropyl methylcellulose ( X 1 , ethyl cellulose ( X 2 and sodium bicarbonate ( X 3 . The floating lag time (F lag , time required for 50% (t 50 and 80% drug dissolution (t 80 were taken as responses. Results of multiple regression analysis indicated that, low level of X 1 and X 2 , and high level of X 3 should be used to manufacture the tablet formulation with desired in vitro floating time and dissolution. Formulations developed using simplex lattice design were fitted to various kinetic models for drug release. Formulation S3 was selected as a promising formulation and was found stable at 40 o and 75% relative humidity for 3 months. Present study demonstrates the use of simplex lattice design in the development of floating tablets with minimum experimentation.

  11. Effects of long working hours and the night shift on severe sleepiness among workers with 12-hour shift systems for 5 to 7 consecutive days in the automobile factories of Korea.

    Science.gov (United States)

    Son, Mia; Kong, Jeong-Ok; Koh, Sang-Baek; Kim, Jaeyoung; Härmä, Mikko

    2008-12-01

    We investigated the effects of 12-hour shift work for five to seven consecutive days and overtime on the prevalence of severe sleepiness in the automobile industry in Korea. [Correction added after online publication 28 Nov: Opening sentence of the summary has been rephrased for better clarity.] A total of 288 randomly selected male workers from two automobile factories were selected and investigated using questionnaires and sleep-wake diaries in South Korea. The prevalence of severe sleepiness at work [i.e. Karolinska Sleepiness Scale (KSS) score of 7 or higher] was modeled using marginal logistic regression and included theoretical risk factors related to working hours and potential confounding factors related to socio-economic status, work demands, and health behaviors. Factors related to working hours increased the risk for severe sleepiness at the end of the shift in the following order: the night shift [odds ratio (OR): 4.7; 95% confidence interval (CI): 3.6-6.0)], daily overtime (OR: 2.2; 95% CI: 1.7-2.9), weekly overtime (OR: 1.6; 95% CI: 1.0-2.6), and night overtime (OR: 1.6; 95% CI: 0.8-3.0). Long working hours and shift work had a significant interactive effect for severe sleepiness at work. Night shift workers who worked for 12 h or more a day were exposed to a risk of severe sleepiness that was 7.5 times greater than day shift workers who worked less than 11 h. Night shifts and long working hours were the main risk factors for severe sleepiness among automobile factory workers in Korea. Night shifts and long working hours have a high degree of interactive effects resulting in severe sleepiness at work, which highlight the need for immediate measures to address these characteristics among South Korean labor force patterns.

  12. Frequency of College Students' Night-Sky Watching Behaviors

    Science.gov (United States)

    Kelly, William E.; Kelly, Kathryn E.; Batey, Jason

    2006-01-01

    College students (N = 112) completed the Noctcaelador Inventory, a measure of psychological attachment to the night-sky, and estimated various night-sky watching related activities: frequency and duration of night-sky watching, astro-tourism, ownership of night-sky viewing equipment, and attendance of observatories or planetariums. The results…

  13. 5 CFR 550.122 - Computation of night pay differential.

    Science.gov (United States)

    2010-01-01

    ... 5 Administrative Personnel 1 2010-01-01 2010-01-01 false Computation of night pay differential... REGULATIONS PAY ADMINISTRATION (GENERAL) Premium Pay Night Pay § 550.122 Computation of night pay differential. (a) Absence on holidays or in travel status. An employee is entitled to a night pay differential...

  14. Study on the disturbing forces for dynamic positioning system of ocean floating structures%海上浮体动力定位外力计算

    Institute of Scientific and Technical Information of China (English)

    王先福; 杨建民; 王磊

    2005-01-01

    动力定位系统(dynamic positioning system)是一种闭环自动控制系统,采用推力器来抵抗风、浪、流等作用在浮体上的环境力,使其保持在所要求的位置上.船舶的风和流作用力由经验公式求得,波浪力主要考虑二阶漂移力,由三维势流理论的直接积分法求得.通过模拟仿真,表明其结果能够用于船舶动力定位系统研究.

  15. A floating point engine for lattice gauge calculations

    Energy Technology Data Exchange (ETDEWEB)

    Husby, D.; Atac, R.; Cook, A.; Deppe, J.; Fischler, M.; Gaines, I.; Wash, T.; Pham, T.; Zmuda, T.

    1989-02-01

    The latest in low cost computing solutions from the Fermilab Advanced Computer Program is targeted at Lattice Gauge theory calculations and delivers supercomputer performance at a fraction of the cost. A typical system with 256 processors, 2.5 Gigabytes of memory, and 64 Gigabytes of on-line tape storage, delivers a peak performance of 5 billion floating point operations per second. The programming environment, Canopy, provides a comprehensive, hardware independent, distributed processing platform from within the more familiar environments of FORTRAN, C, and UNIX. This paper describes the individual processing elements of the system and gives a brief description of the Canopy software.

  16. Y-MP floating point and Cholesky factorization

    Science.gov (United States)

    Carter, Russell

    1991-01-01

    The floating point arithmetics implemented in the Cray 2 and Cray Y-MP computer systems are nearly identical, but large scale computations performed on the two systems have exhibited significant differences in accuracy. The difference in accuracy is analyzed for Cholesky factorization algorithm, and it is found that the source of the difference is the subtract magnitude operation of the Cray Y-MP. The results from numerical experiments for a range of problem sizes are presented, and an efficient method for improving the accuracy of the factorization obtained on the Y-MP is presented.

  17. A floating point engine for lattice gauge calculations

    Energy Technology Data Exchange (ETDEWEB)

    Husby, D.; Atac, R.; Cook, A.; Deppe, J.; Fischler, M.; Gaines, I.; Nash, T.; Pham, T.; Zmuda, T.; Eichten, E.

    1988-11-01

    The latest in low cost computing solutions from the Fermilab Advanced Computer Program is targeted at Lattice Gauge theory calculations and delivers supercomputer performance at a fraction of the cost. A typical system with 256 processors, 2.5 Gigabytes of memory, and 64 Gigabytes of on-line tape storage, delivers a peak performance of 5 billion floating point operations per second. The programming environment, Canopy, provides a comprehensive, hardware independent, distributed processing platform from within the more familiar environments of FORTRAN, C, and UNIX. This paper describes the individual processing elements of the system and gives a brief description of the Canopy software. 8 refs., 3 figs.

  18. Damping Wind and Wave Loads on a Floating Wind Turbine

    DEFF Research Database (Denmark)

    Christiansen, Søren; Bak, Thomas; Knudsen, Torben

    2013-01-01

    Offshore wind energy capitalizes on the higher and less turbulent wind speeds at sea. To enable deployment of wind turbines in deep-water locations, structures are being explored, where wind turbines are placed on a floating platform. This combined structure presents a new control problem, due......, and we show the influence that both wind speed, wave frequencies and misalignment between wind and waves have on the system dynamics. A new control model is derived that extends standard turbine models to include the hydrodynamics, additional platform degrees of freedom, the platform mooring system...

  19. Review of Virginia Woolf's Night and Day

    Directory of Open Access Journals (Sweden)

    Baker M Bani-Khair

    2017-01-01

    Full Text Available In this Review article, we have looked at different aspects that make Virginia Woolf's Night and Day one of the most interesting to read and analyze. We particularly focus on the familial and social patterns that distinguish this novel from other ones written by the same author. We also placed a good emphasis on the strength points the novel shows by looking at various elements such as themes of love relationships, modern treatment of plot and content, and more importantly on characterizations. The article revealed that Woolf's Night and Day is rich in terms of its modern and unconventional approach towards characters, plot, style, and thematic content which all make it a successful novel. Keywords: social stability, Virginia Woolf, Night and Day, techniques, styles, modernism, relationships, success, Marriage

  20. Smart Novel Semi-Active Tuned Mass Damper for Fixed-Bottom and Floating Offshore Wind (Presentation)

    Energy Technology Data Exchange (ETDEWEB)

    Rodriguez Tsouroukdissian, Arturo [Alstom Renewable US LLC

    2016-05-02

    The intention of this paper is to present the results of a novel smart semi-active tuned mass damper (SA-TMD), which mitigates unwanted loads for both fixed-bottom and floating offshore wind systems. (Presentation Format).

  1. Effect of water depth on the performance of intelligent computing models in predicting wave transmission of floating pipe breakwater.

    Digital Repository Service at National Institute of Oceanography (India)

    Patil, S.G.; Mandal, S.; Hegde, A.V.

    Understanding the physics of complex system plays an important role in selection of data for training intelligent computing models. Based on the physics of the wave transmission of Horizontally Interlaced Multilayer Moored Floating Pipe Breakwater...

  2. Modern night vision goggles for advanced infantry applications

    Science.gov (United States)

    Estrera, Joseph P.; Ostromek, Timothy E.; Isbell, Wayne; Bacarella, Antonio V.

    2003-09-01

    Northrop Grumman Electro-Optical Systems (NGEOS) has concentrated in recent years on the development of advanced night vision goggle (NVG) systems. These NVGs developments concentrate on past operational deficiencies such as high light/bright source conditions during military operations in urban terrain (MOUT), poor individual movement technique (IMT) infantry operations, and obscured battlefield and reduced weather conditions. The first area of NVG advancement involves direct image intensifier (I2) replacement involving automatic gated power supply technology for wide dynamic NVG operation and advanced Generation III halo free I2 technology for reduction of NVG image halo and "blooming" artifacts. The second significant development area is NVG individual movement technique (IMT) deficiencies such as reduced field of view, reduced depth perception, center of gravity problems, and limited operation flexibility. These issues of NVG IMT have resulted in the development of an IMT enhanced night vision goggle for the U.S. Army's enhanced night vision goggle (ENVG). Finally, Northrop Grumman EOS is developing a NVG with the capability of producing optimized real-time image fusion from an image intensified sensor and uncooled long wavelength infrared (LWIR) sensor. This new technology allows for optimum imaging in battlefield obscured and laser polluted environment. These image fusion NVG development efforts have concentrated on both optical overlay image fusion and digital image fusion. This paper will compare and contrast these two types of image fusion technologies.

  3. Development of an Automatic Testing Platform for Aviator's Night Vision Goggle Honeycomb Defect Inspection.

    Science.gov (United States)

    Jian, Bo-Lin; Peng, Chao-Chung

    2017-06-15

    Due to the direct influence of night vision equipment availability on the safety of night-time aerial reconnaissance, maintenance needs to be carried out regularly. Unfortunately, some defects are not easy to observe or are not even detectable by human eyes. As a consequence, this study proposed a novel automatic defect detection system for aviator's night vision imaging systems AN/AVS-6(V)1 and AN/AVS-6(V)2. An auto-focusing process consisting of a sharpness calculation and a gradient-based variable step search method is applied to achieve an automatic detection system for honeycomb defects. This work also developed a test platform for sharpness measurement. It demonstrates that the honeycomb defects can be precisely recognized and the number of the defects can also be determined automatically during the inspection. Most importantly, the proposed approach significantly reduces the time consumption, as well as human assessment error during the night vision goggle inspection procedures.

  4. Efficient intra- and inter-night linking of asteroid detections using kd-trees

    CERN Document Server

    Kubica, J; Grav, T; Heasley, J; Jedicke, R; Masiero, J R; Milani, A; Moore, A; Tholen, D; Wainscoat, R J; Kubica, Jeremy; Denneau, Larry; Grav, Tommy; Heasley, James; Jedicke, Robert; Masiero, Joseph; Milani, Andrea; Moore, Andrew; Tholen, David; Wainscoat, Richard J.

    2007-01-01

    The Panoramic Survey Telescope And Rapid Response System (Pan-STARRS) under development at the University of Hawaii's Institute for Astronomy is creating the first fully automated end-to-end Moving Object Processing System (MOPS) in the world. It will be capable of identifying detections of moving objects in our solar system and linking those detections within and between nights, attributing those detections to known objects, calculating initial and differentially-corrected orbits for linked detections, precovering detections when they exist, and orbit identification. Here we describe new kd-tree and variable-tree algorithms that allow fast, efficient, scalable linking of intra and inter-night detections. Using a pseudo-realistic simulation of the Pan-STARRS survey strategy incorporating weather, astrometric accuracy and false detections we have achieved nearly 100% efficiency and accuracy for intra-night linking and nearly 100% efficiency for inter-night linking within a lunation. At realistic sky-plane dens...

  5. Statistical Change Detection for Diagnosis of Buoyancy Element Defects on Moored Floating Vessels

    DEFF Research Database (Denmark)

    Blanke, Mogens; Fang, Shaoji; Galeazzi, Roberto;

    2012-01-01

    Floating platforms with mooring systems are used extensively in off-shore operations. Part of the mooring systems are underwater buoyancy elements that are attached to the mooring lines. Loss or damage of a buoyancy element is invisible but changes the characteristics of the mooring system...

  6. FAST Model Calibration and Validation of the OC5- DeepCwind Floating Offshore Wind System Against Wave Tank Test Data: Preprint

    Energy Technology Data Exchange (ETDEWEB)

    Wendt, Fabian F [National Renewable Energy Laboratory (NREL), Golden, CO (United States); Robertson, Amy N [National Renewable Energy Laboratory (NREL), Golden, CO (United States); Jonkman, Jason [National Renewable Energy Laboratory (NREL), Golden, CO (United States)

    2017-08-09

    During the course of the Offshore Code Comparison Collaboration, Continued, with Correlation (OC5) project, which focused on the validation of numerical methods through comparison against tank test data, the authors created a numerical FAST model of the 1:50-scale DeepCwind semisubmersible system that was tested at the Maritime Research Institute Netherlands ocean basin in 2013. This paper discusses several model calibration studies that were conducted to identify model adjustments that improve the agreement between the numerical simulations and the experimental test data. These calibration studies cover wind-field-specific parameters (coherence, turbulence), hydrodynamic and aerodynamic modeling approaches, as well as rotor model (blade-pitch and blade-mass imbalances) and tower model (structural tower damping coefficient) adjustments. These calibration studies were conducted based on relatively simple calibration load cases (wave only/wind only). The agreement between the final FAST model and experimental measurements is then assessed based on more-complex combined wind and wave validation cases.

  7. Economic Floating Waste Detectionfor Surface Cleaning Robots

    Directory of Open Access Journals (Sweden)

    Sumroengrit Jakkrit

    2017-01-01

    Full Text Available Removing waste out of water surface is a routine task and can be operated by using autonomous surface cleaning robots. This paper presents amethodoflaser-based floating waste detection for surface robot guidance when waste positions are unknown beforehand. Basing on concept of refraction and reflection of laser ray, the proposed laser-based technique is proven to be applicable on floating waste detection. The economic waste detector is constructed and mounted on the robot. Five DOF equations of motion are formulated for calculation of waste position incorporating distance measured by the laser and also the robot motion caused by external wind force as well as water surface tension. Experiments were conducted on a pond with calm water and results show that the presented economic waste detection successfully identify and locate position of plastic bottles floating on water surface within the range of 5 meters.

  8. Determining Light Pollution of the Global Sky: GLOBE at Night

    Science.gov (United States)

    Henderson, S.; Meymaris, K.; Ward, D.; Walker, C.; Russell, R.; Pompea, S.; Salisbury, D.

    2006-05-01

    GLOBE at Night is an international science event designed to observe and record the visible stars as a means of measuring light pollution in a given location. Increased and robust understanding of our environment requires learning opportunities that take place outside of the conventional K-12 classroom and beyond the confines of the school day. This hands-on learning activity extended the traditional classroom and school day last March with a week of nighttime sky observations involving teachers, students and their families. The quality of the night sky for stellar observations is impacted by several factors including human activities. By observing cloud cover and locating specific constellations in the sky, students from around the world learned how the lights in their community contribute to light pollution, exploring the relationship between science, technology and their society. Students learned that light pollution impacts more than just the visibility of stars at night. Lights at night impact both the biology and ecology of many species in our environment. Students were able to participate in this global scientific campaign by submitting their observations through an online database, allowing for authentic worldwide research and analysis by participating scientists. Students and their families learned how latitude and longitude coordinates provide a location system to map and analyze the observation data submitted from around the globe. The collected data is available online for use by students, teachers and scientists worldwide to assess how the quality of the night sky varies around the world. This session will share how students and scientists across the globe can explore and analyze the results of this exciting campaign. GLOBE at Night is a collaborative effort sponsored by The GLOBE Program, the National Optical Astronomy Observatory (NOAO), Centro de Apoyo a la Didactica de la Astronomia (CADIAS), Windows to the Universe, and ESRI. The GLOBE Program is

  9. Augmenting full colour-fused multi-band night vision imagery with synthetic imagery in real-time

    NARCIS (Netherlands)

    Toet, A.; Hogervorst, M.A.; Son, R. van; Dijk, J.

    2011-01-01

    We present the design and first field trial results of an all-day all-weather enhanced and synthetic-fused multi-band colour night vision surveillance and observation system. The system augments a fused and dynamic three-band natural-colour night vision image with synthetic 3D imagery in real-time.

  10. Multitudes attend the Night of Science

    CERN Multimedia

    2006-01-01

    The Night of Science, which took place in the Parc de la Perle du Lac in Geneva last weekend, was a great success, with 30 000 visitors attending according to the organisers. Many curious people flocked to the stands and animations until late on Saturday night and all afternoon on Sunday. The CERN stand (photo) received a great amount of interest from participants. Both kids and adults discovered the activities of the Laboratory and the data-processing revolution initiated by CERN, from the Web to the Computing Grid. Hats off to the CERN collaborators in the Communication Group and IT Department who made this event a success.

  11. Cockpit Readiness For Night Vision Goggles

    Science.gov (United States)

    Scholl, Marija S.; Scholl, James W.

    1987-09-01

    The introduction of night vision goggles into the cockpit environment may produce incompatibility with existing cockpit optoelectronic instrumentation. The methodology used to identify the origin of the spurious signal is demonstrated with the example of an electronic display. The amount of radiation emitted by a gray body in the wavelength region of goggle sensitivity is calculated. A simple procedure for preflight testing of cockpit instrumentation using a commercially available infrared camera is recommended. Other recommendations include the specification of cockpit instrumentation for compatibility with night vision devices.

  12. 浮式钻井平台主动式钻柱升沉补偿装置设计%Design for an active drill-string heave compensation system of the floating drilling platform

    Institute of Scientific and Technical Information of China (English)

    姜浩; 刘衍聪; 张彦廷; 刘振东; 白鹿

    2012-01-01

    To solve problems of the heave movement of a float drilling platform caused by ocean waves, which make a drill string reciprocate with vibration and cause a shock against the drill bit, a new type of active drill-string heave compensation system was designed. This system can achieve a real-time domination over the piston movement of a hydraulic cylinder by controlling the electro-hydraulic proportional direction valve and variable pump, which can compensate the drill string movement caused by heaving of ocean waves. Meanwhile, a system mathematical model was built, and then an experimental table for heave compensation was designed and constructed to carry out simulation, with which the heave movement and dynamic load were simulated. Active heave compensation experiments with the valve control or pump-valve control were carried out under the circumstance of heave motion and dynamic load simulation. The results indicate that the active valve control can get a better compensation effect but be accompanied with larger power consumption, while the pump-valve control consumes smaller power but has a high compensation request in operation and a little worse compensation effect.%针对海浪升沉运动对钻柱和钻压的影响,设计了一种海洋浮式钻井平台主动式钻柱升沉补偿装置,其以电液比例方向阀和变量泵为控制对象,实现了对液压缸活塞运动的实时控制,进而对海浪升沉造成的钻柱运动进行补偿.建立了主动式钻柱升沉补偿装置系统的数学模型,设计、搭建升沉补偿实验台实现了升沉运动和动态负载的实验模拟,并进行了阀控和泵控加周控的主动升沉补偿实验.结果表明:主动阀控方案具有较好的补偿效果,但消耗能量较大;泵控加阀控方案能耗较低,但控制策略要求较高,补偿效果稍差.

  13. FLOATING GASTRO-RETENTIVE DOSAGE FORMS - A NOVEL APPROACH FOR TARGETED AND CONTROLLED DRUG DELIVERY

    Directory of Open Access Journals (Sweden)

    Aleksandar Aleksovski

    2012-04-01

    Full Text Available Controlled (modified release dosage forms are one of the key concepts in drug delivery, leading to enhanced drug bioavailability and increased patient’s compliance. However conventional modified release dosage forms encounter one big disadvantage- lack of site-specific drug delivery. Scientists developed different kinds of targeted oral controlled release forms. One of these are gastro-retentive systems- systems which can remain in the stomach region for prolonged period of time and thereby release the active compound in controlled fashion. Floating dosage forms are the most promising approach of all gastro-retentive systems. They are capable to float over the gastric content in longer time intervals. This article makes a review on floating dosage forms in general, different approaches for achieving flotation, advantages and disadvantages of this drug delivery concept. For better understanding the topic,an emphasis is made also on the anatomical and physiological features of the stomach and on the factors affecting gastric retention.

  14. Produção de mudas de espécies forrageiras no sistema hidropônico de leito flutuante (floating com solução nutritiva à base de biofertilizante ou adubo solúvel - DOI: 10.4025/actascianimsci.v31i4.4290 Production of seedlings of forage species in floating hydroponics system with biofertilizer or soluble fertilizer - DOI: 10.4025/actascianimsci.v31i4.7459

    Directory of Open Access Journals (Sweden)

    Júlio Graeff Erpen

    2009-10-01

    Full Text Available Neste trabalho objetivou-se avaliar a sobrevivência das estacas e a produção de matéria seca na fase de cultivo de mudas das espécies forrageiras missioneira gigante (Axonopus catharinensis, amendoim forrageiro (Arachis pintoi e maku (Lotus uliginosus cv. Maku. No sistema hidropônico de leito flutuante com solução nutritiva à base de biofertilizante ou adubo solúvel. O delineamento experimental adotado foi o de blocos ao acaso em esquema fatorial 3 x 2, sendo três espécies forrageiras e duas soluções nutritivas. As espécies não apresentaram diferença quanto à sobrevivência (p = 0,225, independentemente do tipo de fertilizante (p = 0,92. No entanto, quando se quantificou a produção de MS planta-1 proporcionada por cada uma dessas espécies, o maku (p = 0,001 obteve as maiores quantidades (47,18 g, enquanto o amendoim forrageiro (19,90 g e a missioneira gigante (16,81 g foram semelhantes entre si (p = 0,227, tendo o mesmo ocorrido entre os fertilizantes (p = 0,559. Deste modo, as três espécies possuem condições semelhantes de sobrevivência, independentemente da concentração de nutrientes da solução nutritiva, com o maku proporcionando a maior produção de MS planta-1.Production of seedlings of forage species in floating hydroponics system with biofertilizer or soluble fertilizer. The aim of this work was to evaluate the survival and dry matter production during the seedling culture phase of three forage species: Axonopus catharinensis, forage peanut (Arachis pintoi, and greater lotus (Lotus uliginosus cv. Maku, in a floating hydroponic system using biofertilizer or soluble fertilizer. The experimental design adopted was randomized blocks in a 3 x 2 factorial scheme, with three forage species and two fertilizers. There was no difference between species with regard to survival (p = 0.225, regardless of the fertilizer used (p = 0.92. However, when dry matter production was considered, Maku (p = 0,001 showed greater

  15. FLOAT2 WP4: Development of Materials

    DEFF Research Database (Denmark)

    Esteves, Luis Pedro; Aarup, Bendt

    This report refers to complementary material testing to support the design and production of UHPC floaters for installation in the Wave Star Machine under FLOAT2 project. The main objective of WP4 is the characterization of mechanical properties of fiber-reinforced UHPC.......This report refers to complementary material testing to support the design and production of UHPC floaters for installation in the Wave Star Machine under FLOAT2 project. The main objective of WP4 is the characterization of mechanical properties of fiber-reinforced UHPC....

  16. Improvements in floating point addition/subtraction operations

    Energy Technology Data Exchange (ETDEWEB)

    Farmwald, P.M.

    1984-02-24

    Apparatus is described for decreasing the latency time associated with floating point addition and subtraction in a computer, using a novel bifurcated, pre-normalization/post-normalization approach that distinguishes between differences of floating point exponents.

  17. Floating Inductance and FDNR Using Positive Polarity Current Conveyors

    OpenAIRE

    Pal, K.

    2004-01-01

    A generalized circuit based on five positive polarity second-generation current conveyors is introduced. The circuit simulates a floating inductance, capacitor floatation circuit and floating fdnr. All these circuits use grounded capacitors.

  18. Floating Inductance and FDNR Using Positive Polarity Current Conveyors

    Directory of Open Access Journals (Sweden)

    K. Pal

    2004-01-01

    Full Text Available A generalized circuit based on five positive polarity second-generation current conveyors is introduced. The circuit simulates a floating inductance, capacitor floatation circuit and floating fdnr. All these circuits use grounded capacitors.

  19. Argo Float Data from the APDRC DAPPER Server

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The floats are designed to drift at a fixed pressure (usually 1000 dbar) for 10 days. After this period, the floats move to a profiling pressure (usually between...

  20. Night-time atmospheric chemistry of methacrylates.

    Science.gov (United States)

    Salgado, M Sagrario; Gallego-Iniesta, M Paz; Martín, M Pilar; Tapia, Araceli; Cabañas, Beatriz

    2011-07-01

    Methacrylates are α, β-unsaturated esters that are widely used in the polymer plastics and resins production. Kinetic information of NO(3) radical reactions is especially scarce and a good understanding of all the atmospheric oxidation processes of these compounds is necessary in order to determine lifetimes in the atmosphere and to evaluate the impact of these reactions on the formation of ozone and other photooxidants. The experiments have been carried out using the relative technique in a static Teflon reactor at room temperature and atmospheric pressure (N(2) as bath gas) using gas chromatography (GC)-flame ionization detection (FID) as detection system. Products were analyzed using solid phase microextraction (SPME)-GC-mass spectrometry (MS) technique and Fourier transform infrared spectroscopy (FTIR) using air as bath gas. The following rate coefficients were obtained (in cm(3) molecule(-1) s(-1)): methyl methacrylate + NO(3) = (3.55 ± 0.62) × 10(-15), ethyl methacrylate + NO(3) = (5.42 ± 1.90) × 10(-15), butyl methacrylate + NO(3) = (7.87 ± 3.86) × 10(-15). Methylpyruvate, ethylpyruvate, and butylpyruvate/butanol were identified as main degradation products respectively in the GC-MS analysis. Nitrates compounds were also identified in the FTIR study. The reactivity increases with the substitution and with the chain of the alkyl group in -C(O)OR. An electrophilic addition mechanism is proposed as dominant degradation process. Estimations of the atmospheric lifetimes clearly indicate that the dominant atmospheric loss process for methacrylate esters is their daytime reaction with the hydroxyl radical. NO(3) and ozone are the main oxidants at night time. A detailed products analysis including quantification could elucidate the mechanism for butanol generation for butyl methacrylate reaction.

  1. How a small enterprise improved the conditions of night and shift work using local resources.

    Science.gov (United States)

    Khai, T T; Kawakami, T; Kogi, K

    2001-12-01

    A small oxygen factory in Cantho Province located in the Mekong Delta Area in the southern part of Vietnam was studied to provide practical support measures to improve night and shift work. A direct observation study and a fatigue symptom survey during the work were conducted. The factory applied discontinuous two-shift systems in two teams. Depending on customers' demands, they frequently prolonged oxygen production until midnight. The study results showed work-related risks such as carrying heavy oxygen cylinders, workers' sleepiness during the night work, and increased fatigue feelings among production operators. Based on the study results, better strategies for night and shift work schedules such as regular work hours minimizing overtime and night work were discussed with the managers and workers. A follow-up visit three months later confirmed many improvements undertaken in the factory. Better work arrangements for night and shift workers were made including local lighting, resting corners, filling the height gaps on the work floors, and clear work instructions. Prolonged mid-night shift was stopped. It was concluded that local small enterprises in Vietnam have much potential to improve their conditions of shift and night work once practical support measures based on their local practice is given.

  2. Free-floating planets: a viable option for panspermia

    CERN Document Server

    Durand-Manterola, Hector Javier

    2010-01-01

    Genomic complexity can be used as a clock with which the moment in which life originated can be measured. Some authors who have studied this problem have come to the conclusion that it is not possible that terrestrial life originated here and that, in reality, life originated giga-years ago, before the solar system existed. If we accept this conclusion there is no other option than to admit that panspermia is something viable.The goal of this study is to propose a viable hypothesis for the transport of SLF from one planetary system to another. During the formation period of a planetary system giant planets can eject planets the size of the Earth, or larger, turning them into free-floating planets in interstellar space. These free-floating planets have also been called free floaters. If a free floater, which has developed life, enters a lifeless planetary system, it can seed the worlds of this system with SLF dragged by the stellar wind from one planet to another or by great impacts on the free planet. To supp...

  3. Analysis of Thursday Night NFL Winning Margins

    Science.gov (United States)

    Vaughan, Timothy S.

    2015-01-01

    This paper introduces a dataset and associated analysis of the scores of National Football League (NFL) games over the 2012, 2013, and first five weeks of the 2014 season. In the face of current media attention to "lopsided" scores in Thursday night games in the early part of the 2014 season, t-test results indicate no statistically…

  4. Early Birds by Light at Night

    NARCIS (Netherlands)

    Jong, De Maaike; Caro, Samuel P.; Gienapp, Phillip; Spoelstra, Kamiel; Visser, Marcel E.

    2017-01-01

    Artificial light at night disturbs the daily rhythms of many organisms. To what extent this disturbance depends on the intensity and spectral composition of light remain obscure. Here, we measured daily activity patterns of captive blue tits (Cyanistes caeruleus) exposed to similar intensities of

  5. What's crucial in night vision goggle simulation ?

    NARCIS (Netherlands)

    Kooi, F.L.; Toet, A.

    2005-01-01

    Training is required to correctly interpret NVG imagery. Training night operations with simulated intensified imagery has great potential. Compared to direct viewing with the naked eye, intensified imagery is relatively easy to simulate and the cost of real NVG training is high (logistics, risk,

  6. Behavioral management of night eating disorders

    Directory of Open Access Journals (Sweden)

    Berner LA

    2013-03-01

    Full Text Available Laura A Berner,1 Kelly C Allison2 1Department of Psychology, Drexel University, 2Department of Psychiatry, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA Abstract: Night eating syndrome (NES is a form of disordered eating associated with evening hyperphagia (overeating at night and nocturnal ingestions (waking at night to eat. As with other forms of disordered eating, cognitive and behavioral treatment modalities may be effective in reducing NES symptoms. This review presents evidence for a variety of behavioral treatment approaches, including behavioral therapy, phototherapy, behavioral weight loss treatment, and cognitive-behavioral therapy. A more detailed overview of cognitive-behavioral therapy for NES is provided. All of these studies have been case studies or included small samples, and all but one have been uncontrolled, but the outcomes of many of these approaches are promising. Larger randomized controlled trials are warranted to advance NES treatment literature. With the inclusion of NES in the fifth edition of the Diagnostic and Statistical Manual of Mental Disorders (DSM-5 as a “Feeding or Eating Disorder Not Elsewhere Classified,” more sophisticated, empirically-supported, behaviorally-based treatment approaches are much needed. Keywords: night eating syndrome, cognitive-behavioral treatment, phototherapy, behavioral weight loss, behavior therapy

  7. Family Literacy Night: A Celebration of Reading!

    Science.gov (United States)

    Campbell, Becky; Morton, Shirley; Rumschlag, Hella

    2011-01-01

    Family Literacy Night is an exciting way to engage students and their parents in meaningful literacy activities while building community spirit and strengthening the partnership between school and home. It is an opportunity for students to show their parents what they do in school; how they create in the computer lab, how they work in the art…

  8. Invite an Alien to Astronomy Night

    Science.gov (United States)

    Governor, Donna; Richwine, Pebble

    2007-01-01

    Dozens of inflatable aliens recently "descended" upon the authors' middle school to kick-off their first school-wide Astronomy night. With an estimated attendance of over 500, their eighth-grade students hosted over a dozen activity-rich sessions designed to entertain and educate students and their families about the wonders of the solar system…

  9. Methods and Strategies: Math and Science Night

    Science.gov (United States)

    Sullivan, Joan; Hatton, Mary

    2011-01-01

    Family Math and Science Nights engage students and parents in active investigations tied to the curriculum in a fun, informal environment. Through this program, families actively explore math and science ideas, discover together through guided inquiry, and apply their discoveries to solve a problem at the end. All activities are hands-on, use…

  10. Science by night – it's magic!

    CERN Multimedia

    CERN Bulletin

    2010-01-01

    The control rooms of the LHC and its experiments threw open their doors to 150 youngsters on European Researchers Night and the place was buzzing with excitement all evening!    It's just possible that a few scientists' vocations were born last Friday night, as the sixth European Researchers Night took place across Europe. CERN was taking part for the first time and invited young people aged from 12 to 19 into the control rooms of the LHC machine and five experiments. From 5.00 in the afternoon until 1.00 in the morning, 150 youngsters and physics teachers got the opportunity to sit with scientists at the controls of the accelerator and experiments. This meeting of minds went down very well for all concerned, the scientists being only too happy to wax lyrical about their passion. The youngsters were thrilled with their visit and amazed at being allowed so close to the controls of these mighty machines. The night-time setting added an extra touch of magic to the whole event. Some just could...

  11. Sirius brightest diamond in the night sky

    CERN Document Server

    Holberg, Jay B

    2007-01-01

    This book describes why Sirius has been regarded as an important fixture of the night sky since the beginnings of history. It also examines the part that Sirius has played in how we came to achieve our current scientific understanding of stars.

  12. Portable real-time color night vision

    NARCIS (Netherlands)

    Toet, A.; Hogervorst, M.A.

    2008-01-01

    We developed a simple and fast lookup-table based method to derive and apply natural daylight colors to multi-band night-time images. The method deploys an optimal color transformation derived from a set of samples taken from a daytime color reference image. The colors in the resulting colorized mul

  13. What's crucial in night vision goggle simulation ?

    NARCIS (Netherlands)

    Kooi, F.L.; Toet, A.

    2005-01-01

    Training is required to correctly interpret NVG imagery. Training night operations with simulated intensified imagery has great potential. Compared to direct viewing with the naked eye, intensified imagery is relatively easy to simulate and the cost of real NVG training is high (logistics, risk, civ

  14. Portable real-time color night vision

    NARCIS (Netherlands)

    Toet, A.; Hogervorst, M.A.

    2008-01-01

    We developed a simple and fast lookup-table based method to derive and apply natural daylight colors to multi-band night-time images. The method deploys an optimal color transformation derived from a set of samples taken from a daytime color reference image. The colors in the resulting colorized mul

  15. Urban planning and traffic safety at night

    Science.gov (United States)

    Ispas, N.; Trusca, D.

    2016-08-01

    Urban planning including traffic signs serve vital functions, providing road users with regulatory, warning and guidance information about the roadway and surrounding environment. There are a large number of signs and even more guidelines on how these signs should be designed, installed, and maintained in concordance with on road surface traffic signs. More requirements for signs are made for night urban traffic, including appearance (size, shape, colour), placement (height, lateral, and longitudinal), maintenance (visibility, position, damage) and signs light and retroreflective. In the night, traffic signs visibility can interact by on pedestrian visibility and diminish urban traffic safety. The main aim of this paper are the scientific determination of an urban specific zone visibility for evaluate at night real conditions in case of a traffic accident in the Braşov city area. The night visibility study was made using PC-Rect version 4.2. Other goal of the paper was to modify some urban planning solution in order to increase the urban safety in Brașov.

  16. Artificial night lighting inhibits feeding in moths

    NARCIS (Netherlands)

    Langevelde, Van Frank; Grunsven, Van Roy H.A.; Veenendaal, Elmar M.; Fijen, Thijs P.M.

    2017-01-01

    One major, yet poorly studied, change in the environment is nocturnal light pollution, which strongly alters habitats of nocturnally active species. Artificial night lighting is often considered as driving force behind rapid moth population declines in severely illuminated countries. To understand

  17. Portable real-time color night vision

    NARCIS (Netherlands)

    Toet, A.; Hogervorst, M.A.

    2008-01-01

    We developed a simple and fast lookup-table based method to derive and apply natural daylight colors to multi-band night-time images. The method deploys an optimal color transformation derived from a set of samples taken from a daytime color reference image. The colors in the resulting colorized

  18. The Night Of Hennessy Paradis Extra Cognac

    Institute of Scientific and Technical Information of China (English)

    2004-01-01

    <正>The world-known Hennessy Paradis Extra Cognaclaunched its"dazzling night"on the evening of May 22 tolet guests enjoy to their hearts’content the fine wine andthe charming glamour of the diamond evening dress. A liquid,dating back to the 18th century,was called

  19. Why Is the Sky Dark at Night?

    Science.gov (United States)

    Stinner, Arthur

    2014-01-01

    The puzzle as to just why the sky is dark at night, given that there are so many stars, has been around at least since Newton. This article summarizes six cosmological models that have been used to attempt to give an account of this puzzle including the Copernican universe, the Newton-Halley universe, the nineteenth century "one galaxy"…

  20. RANS Simulation of the Heave Response of a Two-Body Floating Point Wave Absorber: Preprint

    Energy Technology Data Exchange (ETDEWEB)

    Yu, Y.; Li, Y.

    2011-03-01

    A preliminary study on a two-body floating wave absorbers is presented in this paper. A Reynolds-Averaged Navier-Stokes computational method is applied for analyzing the hydrodynamic heave response of the absorber in operational wave conditions. The two-body floating wave absorber contains a float section and a submerged reaction section. For validation purposes, our model is first assumed to be locked. The two sections are forced to move together with each other. The locked single body model is used in a heave decay test, where the RANS result is validated with the experimental measurement. For the two-body floating point absorber simulation, the two sections are connected through a mass-spring-damper system, which is applied to simulate the power take-off mechanism under design wave conditions. Overall, the details of the flow around the absorber and its nonlinear interaction with waves are investigated, and the power absorption efficiency of the two-body floating wave absorber in waves with a constant value spring-damper system is examined.