WorldWideScience

Sample records for case study-hanaa handheld

  1. Hand-held tidal breathing nasal nitric oxide measurement--a promising targeted case-finding tool for the diagnosis of primary ciliary dyskinesia

    DEFF Research Database (Denmark)

    Marthin, June Kehlet; Nielsen, Kim Gjerum

    2013-01-01

    at flow rates 2 ml/s or 5 ml/s, and two stationary chemiluminescence devices, applying both tidal breathing and velum closure techniques. RESULTS: Measurements were done in 16 PCD patients, 21 patients with CF and 20 HS aged between 3.8 and 60.9 years. Hand-held TB-nNO showed high success rate (96.......5-100%) vs. velum closure nNO techniques (70.2-89.5%). Hand-held TB-nNO sampling at flow rate 5 ml/s showed equally high discriminative power (PCD vs. HS [p... of agreement compared to TB-nNO by stationary devices and even compared to velum closure sampling. CONCLUSION: Hand-held TB-nNO discriminates significantly between PCD, CF and HS and shows promising potential as a widespread targeted case-finding tool for PCD, although further studies are warranted before...

  2. Handheld Versus Wearable Interaction Design for Professionals - A Case Study of Hospital Service Work

    DEFF Research Database (Denmark)

    Stisen, Allan; Blunck, Henrik; Kjærgaard, Mikkel Baun;

    2014-01-01

    With the blooming of new available wrist worn devices there are potentials for these to support the work done in many professional domains. One such domain is hospital service work. This paper explores two wearable prototypes with regards to challenges and opportunities to support future hospital...... aspects to aid designers of next generation wearable designs for hospital service work.......With the blooming of new available wrist worn devices there are potentials for these to support the work done in many professional domains. One such domain is hospital service work. This paper explores two wearable prototypes with regards to challenges and opportunities to support future hospital...... service work. This explorative study was conducted with 4 experienced hospital orderlies who interacted with an application across two wearable concepts, and one handheld smartphone in five scenarios in a hospital environment. The interaction was video recorded with a chest-mounted video afterwards semi...

  3. Acceptability and adoption of handheld computer data collection for public health research in China: a case study

    OpenAIRE

    Wan, Xia; Raymond, H Fisher; Wen, Tiancai; Ding, Ding; Wang, Qian; Shin, Sanghyuk S.; Yang, Gonghuan; Chai, Wanxing; Zhang, Peng; Novotny, Thomas E

    2013-01-01

    Background Handheld computers for data collection (HCDC) and management have become increasingly common in health research. However, current knowledge about the use of HCDC in health research in China is very limited. In this study, we administered a survey to a hard-to-reach population in China using HCDC and assessed the acceptability and adoption of HCDC in China. Methods Handheld computers operating Windows Mobile and Questionnaire Development Studio (QDS) software (Nova Research Company)...

  4. New Clothing for Handheld Devices

    Science.gov (United States)

    Roman, Harry T.

    2013-01-01

    Clothing is influenced by many factors, trends, and social happenings. Much of what is worn today had utilitarian roots in the past. In the activitiy presented in this article, students will have the opportunity to redesign clothing for new trends, in this case, the explosion of handheld electronic devices.

  5. Resources: Handheld Computing Devices

    OpenAIRE

    Denson, Cameron

    2008-01-01

    The article features a valuable resource to aid teachers in their effort to satisfy the need to implement modern instructional technology and their students' need to access green technology. It states that handheld computing devices are currently being widely used in many classrooms and technology savvy educators can manifest to the benefits of these data-collection systems. It believes that handheld units can offer students with an all-inclusive technological device that caters to all learners.

  6. Miniaturized handheld hyperspectral imager

    Science.gov (United States)

    Wu, Huawen; Haibach, Frederick G.; Bergles, Eric; Qian, Jack; Zhang, Charlie; Yang, William

    2014-05-01

    A miniaturized hyperspectral imager is enabled with image sensor integrated with dispersing elements in a very compact form factor, removing the need for expensive, moving, bulky and complex optics that have been used in conventional hyperspectral imagers for decades. The result is a handheld spectral imager that can be installed on miniature UAV drones or conveyor belts in production lines. Eventually, small handhelds can be adapted for use in outpatient medical clinics for point-of-care diagnostics and other in-field applications.

  7. Handheld THz security imaging

    Science.gov (United States)

    Duling, Irl N.

    2016-05-01

    Terahertz energy, with its ability to penetrate clothing and non-conductive materials, has held much promise in the area of security scanning. Millimeter wave systems (300 GHz and below) have been widely deployed. These systems have used full two-dimensional surface imaging, and have resulted in privacy concerns. Pulsed terahertz imaging, can detect the presence of unwanted objects without the need for two-dimensional photographic imaging. With high-speed waveform acquisition it is possible to create handheld tools that can be used to locate anomalies under clothing or headgear looking exclusively at either single point waveforms or cross-sectional images which do not pose a privacy concern. Identification of the anomaly to classify it as a potential threat or a benign object is also possible.

  8. Handheld Microfluidic Blood Ananlyzer Project

    Data.gov (United States)

    National Aeronautics and Space Administration — Nanohmics proposes to develop a handheld blood analyzer for micro- and hypo-gravity missions. The prototype instrument will combine impedance analysis with optical...

  9. Handheld CAT Video Game Project

    Data.gov (United States)

    National Aeronautics and Space Administration — The proposed project is to design, develop and fabricate a handheld video game console for astronauts during long space flight. This portable hardware runs...

  10. Pyxis handheld polarimetric imager

    Science.gov (United States)

    Chenault, David B.; Pezzaniti, J. Larry; Vaden, Justin P.

    2016-05-01

    The instrumentation for measuring infrared polarization signatures has seen significant advancement over the last decade. Previous work has shown the value of polarimetric imagery for a variety of target detection scenarios including detection of manmade targets in clutter and detection of ground and maritime targets while recent work has shown improvements in contrast for aircraft detection and biometric markers. These data collection activities have generally used laboratory or prototype systems with limitations on the allowable amount of target motion or the sensor platform and usually require an attached computer for data acquisition and processing. Still, performance and sensitivity have been steadily getting better while size, weight, and power requirements have been getting smaller enabling polarimetric imaging for a greater or real world applications. In this paper, we describe Pyxis®, a microbolometer based imaging polarimeter that produces live polarimetric video of conventional, polarimetric, and fused image products. A polarization microgrid array integrated in the optical system captures all polarization states simultaneously and makes the system immune to motion artifacts of either the sensor or the scene. The system is battery operated, rugged, and weighs about a quarter pound, and can be helmet mounted or handheld. On board processing of polarization and fused image products enable the operator to see polarimetric signatures in real time. Both analog and digital outputs are possible with sensor control available through a tablet interface. A top level description of Pyxis® is given followed by performance characteristics and representative data.

  11. Digital forensics for handheld devices

    CERN Document Server

    Doherty, Eamon P

    2012-01-01

    Approximately 80 percent of the world's population now owns a cell phone, which can hold evidence or contain logs about communications concerning a crime. Cameras, PDAs, and GPS devices can also contain information related to corporate policy infractions and crimes. Aimed to prepare investigators in the public and private sectors, Digital Forensics for Handheld Devices examines both the theoretical and practical aspects of investigating handheld digital devices. This book touches on all areas of mobile device forensics, including topics from the legal, technical, academic, and social aspects o

  12. The utility of intraoperative handheld gamma camera for detection of sentinel lymph nodes in melanoma

    Energy Technology Data Exchange (ETDEWEB)

    Ozkan, Elgin; Eroglu, Aydan [Ankara University Medical School, Ankara (Turkmenistan)

    2015-12-15

    Accurate identification of the sentinel lymph node (SLN) is an important prognostic factor for melanoma. In a minority of cases drainage to interval nodal basins, such as the epitrochlear region, are possible. Intraoperative handheld gamma cameras have been used to detect SLNs which are located in different anatomical localizations. In this case we report the utility of an intraoperative handheld gamma camera in the localization of epitrochlear drainage of distal upper extremity melanoma and its impact on surgical procedure.

  13. Critical care procedure logging using handheld computers

    OpenAIRE

    Carlos Martinez-Motta, J; Walker, Robin; Stewart, Thomas E; Granton, John; Abrahamson, Simon; Lapinsky, Stephen E

    2004-01-01

    Introduction We conducted this study to evaluate the feasibility of implementing an internet-linked handheld computer procedure logging system in a critical care training program. Methods Subspecialty trainees in the Interdepartmental Division of Critical Care at the University of Toronto received and were trained in the use of Palm handheld computers loaded with a customized program for logging critical care procedures. The procedures were entered into the handheld device using checkboxes an...

  14. Accentuated Factors of Handheld Computing

    DEFF Research Database (Denmark)

    Andersson, Bo; Henningsson, Stefan

    The recent years of rapid development of mobile technologies creates opportunities for new user-groups in the mobile workforce to take advantage of in-formation systems (IS). However, to apprehend and harness these opportunities for mobile IS it is crucial to fully understand the user group and t......, these two steps develop the framework towards a theoretical contribution as theory for describing handheld computing from a designer’s perspective. Thirteen semi-structured interviews were made and the tentative framework was elaborated and confirmed....

  15. Accentuated Factors of Handheld Computing

    DEFF Research Database (Denmark)

    Andersson, Bo; Henningsson, Stefan

    2013-01-01

    The recent years of rapid development of mobile technologies create opportunities for new user groups in the mobile workforce to take advantage of information systems (IS). However, to apprehend and harness these opportunities for mobile IS, it is crucial to fully understand the user group and th......, these two steps develop the framework towards a theoretical contribution as theory for describing handheld computing from a designer’s perspective. Thirteen semi-structured interviews were made and the tentative framework was elaborated and confirmed....

  16. Handheld ESPI-speckle interferometer

    DEFF Research Database (Denmark)

    Skov Hansen, René

    2003-01-01

    reference. The reference wave is established by reflecting a part of the diffuse object illumination from a glass plate located just in front of the object. The glass plate is mounted on a piezoelectric translator in order to control the phase of the reference wave when using phase stepping algorithms...... and controlling the phase of the reference wave constitutes a compact "handheld" instrument and eliminates the need for installing extra hardware, such as frame grabber and Digital to Analog converter, in the host computer....

  17. Absorption Related to Hand-Held Devices in Data Mode

    DEFF Research Database (Denmark)

    Andersen, Jørgen Bach; Nielsen, Jesper Ødum; Pedersen, Gert F.

    2016-01-01

    The human body has an influence on the radiation from handheld devices like smartphones, tablets and laptops, part of the energy is absorbed and the spatial distribution of the radiated part is modified. Previous studies of whole body absorp- tion have mainly been numerical or related to talk mod...... in all cases. The losses in the inbuilt antennas are often dominating and with a maximum total loss of 99% for the smartphone for one user. The absorption in the body is around 50%....

  18. Augmented Reality Simulations on Handheld Computers

    Science.gov (United States)

    Squire, Kurt; Klopfer, Eric

    2007-01-01

    Advancements in handheld computing, particularly its portability, social interactivity, context sensitivity, connectivity, and individuality, open new opportunities for immersive learning environments. This article articulates the pedagogical potential of augmented reality simulations in environmental engineering education by immersing students in…

  19. Learning environments and rapidly evolving handheld technologies

    OpenAIRE

    Ochola, J. Evans; Stachowiak, James R.; Achrazoglou, John G.; David B. Bills

    2013-01-01

    More and more K–12 school teachers are using handheld devices in classrooms. The mobile nature of handheld technologies is often seen as an integral characteristic facilitating collaborative learning and flexible learning arrangements. Since both portable devices and ideas about the learning environment are rapidly evolving, teachers need to be aware of technologies and classroom arrangements that can help improve student performance and classroom experiences.

  20. Secure Software and Communication on Handheld Devices

    OpenAIRE

    Hussain, Musharrif; Mahmood, Sulman

    2007-01-01

    Some applications on mobile handheld devices are involved in exchanging critical information e. g. sending positioning data of heavy-good vehicles as a basis for road toll. This information must not be accessed or modified illegitimately; however, there is the risk that can be accessed or modified by modifying the application or during communication of the handheld device with its counterpart. This thesis report investigates concepts to shelter software from modification and how the communica...

  1. Handheld interface for miniature sensors

    Science.gov (United States)

    Kedia, Sunny; Samson, Scott A.; Farmer, Andrew; Smith, Matthew C.; Fries, David; Bhansali, Shekhar

    2005-02-01

    Miniaturization of laboratory sensors has been enabled by continued evolution of technology. Field portable systems are often desired, because they reduce sample handling, provide rapid feedback capability, and enhance convenience. Fieldable sensor systems should include a method for initiating the analysis, storing and displaying the results, while consuming minimal power and being compact and portable. Low cost will allow widespread usage of these systems. In this paper, we discuss a reconfigurable Personal Data Assistant (PDA) based control and data collection system for use with miniature sensors. The system is based on the Handspring visor PDA and a custom designed motherboard, which connects directly to the PDA microprocessor. The PDA provides a convenient and low cost graphical user interface, moderate processing capability, and integrated battery power. The low power motherboard provides the voltage levels, data collection, and input/output (I/O) capabilities required by many MEMS and miniature sensors. These capabilities are relayed to connectors, where an application specific daughterboard is attached. In this paper, two applications are demonstrated. First, a handheld nucleic acid sequence-based amplification (NASBA) detection sensor consisting of a heated and optical fluorescence detection system is discussed. Second, an electrostatically actuated MEMS micro mirror controller is realized.

  2. A Compact Diversity Antenna for Handheld Terminals

    Institute of Scientific and Technical Information of China (English)

    Hai-Lin Xiao; Zai-Ping Nie; Yu-Jing Wu

    2009-01-01

    The handheld terminals antenna should have a small size, sufficient gain and big bandwidth. In this paper, a compact planar inverted-L diversity antenna for handheld terminals is proposed. Three diversity antennas operating at 2.15 GHz are designed and the effect of important parameters of the proposed antenna is measured. The isolation is found to be better than 13 dB, the usable bandwidth is about 13%. Moreover, the measured radiation patterns are also obtained that the backward radiation is decreased.

  3. 30 CFR 57.12033 - Hand-held electric tools.

    Science.gov (United States)

    2010-07-01

    ... 30 Mineral Resources 1 2010-07-01 2010-07-01 false Hand-held electric tools. 57.12033 Section 57.12033 Mineral Resources MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR METAL AND NONMETAL... Surface and Underground § 57.12033 Hand-held electric tools. Hand-held electric tools shall not...

  4. 30 CFR 56.12033 - Hand-held electric tools.

    Science.gov (United States)

    2010-07-01

    ... 30 Mineral Resources 1 2010-07-01 2010-07-01 false Hand-held electric tools. 56.12033 Section 56.12033 Mineral Resources MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR METAL AND NONMETAL....12033 Hand-held electric tools. Hand-held electric tools shall not be operated at high...

  5. [The design of handheld fast ECG detector].

    Science.gov (United States)

    Shi, Bo; Zhang, Genxuan; Tsau, Young

    2013-03-01

    A new handheld fast ECG detector based on low gain amplifier, the high resolution analog to digital converter, the real-time digital filter, fast P-QRS-T wave detection and abstraction algorithm was designed. The results showed that the ECG detector can meet the requirements of fast detecting heart rate and ECG P-QRS-T waveforms. PMID:23777065

  6. Handheld spectrometers: the state of the art

    Science.gov (United States)

    Crocombe, Richard A.

    2013-05-01

    "Small" spectrometers fall into three broad classes: small versions of laboratory instruments, providing data, subsequently processed on a PC; dedicated analyzers, providing actionable information to an individual operator; and process analyzers, providing quantitative or semi-quantitative information to a process controller. The emphasis of this paper is on handheld dedicated analyzers. Many spectrometers have historically been large, possible fragile, expensive and complicated to use. The challenge over the last dozen years, as instruments have moved into the field, has been to make spectrometers smaller, affordable, rugged, easy-to-use, but most of all capable of delivering actionable results. Actionable results can dramatically improve the efficiency of a testing process and transform the way business is done. There are several keys to this handheld spectrometer revolution. Consumer electronics has given us powerful mobile platforms, compact batteries, clearly visible displays, new user interfaces, etc., while telecomm has revolutionized miniature optics, sources and detectors. While these technologies enable miniature spectrometers themselves, actionable information has demanded the development of rugged algorithms for material confirmation, unknown identification, mixture analysis and detection of suspicious materials in unknown matrices. These algorithms are far more sophisticated than the `correlation' or `dot-product' methods commonly used in benchtop instruments. Finally, continuing consumer electronics advances now enable many more technologies to be incorporated into handheld spectrometers, including Bluetooth, wireless, WiFi, GPS, cameras and bar code readers, and the continued size shrinkage of spectrometer `engines' leads to the prospect of dual technology or `hyphenated' handheld instruments.

  7. HAND-HELD MYOMETRY - REFERENCE VALUES

    NARCIS (Netherlands)

    VANDERPLOEG, RJO; FIDLER, [No Value; OOSTERHUIS, HJGH

    1991-01-01

    In thirteen major muscle groups of 50 healthy females and 50 males, aged 20-60 years, maximum voluntary contraction was measured with a hand-held dynamometer. The intrasession variation, the left-right variation, and the fifth and fiftieth centile values were calculated. The ratio of two observation

  8. Market Report for Industrial Handheld Wireless Devices

    OpenAIRE

    Mossannen-Amini, Khosrow

    2008-01-01

    This report, as a preliminary market study of industrial handheld wireless devices, includes a market overview, a market research analysis based on the 5Cs (Customers, Company, Competitors, Collaborators, and Context), market characteristics (size, segmentation, vertical market applications, and demand), future opportunities projections, and an industry analysis using the five-forces model. The data, facts and evidence for this report were gathered through primary research with global design ...

  9. Handheld Digital TV Performance Evaluation Method

    Directory of Open Access Journals (Sweden)

    Gunnar Bedicks

    2008-01-01

    Full Text Available This paper presents a simplified method for signal level clearance evaluation in each place of signal reception up to threshold for a given portable TV receiver device. It describes briefly the structure of transmission system considering the “1Seg” structure of ISDB-T. The preliminary laboratory test was made before the field tests to verify the main features of handheld receiver.

  10. Step Length Estimation Using Handheld Inertial Sensors

    Directory of Open Access Journals (Sweden)

    Gérard Lachapelle

    2012-06-01

    Full Text Available In this paper a novel step length model using a handheld Micro Electrical Mechanical System (MEMS is presented. It combines the user’s step frequency and height with a set of three parameters for estimating step length. The model has been developed and trained using 12 different subjects: six men and six women. For reliable estimation of the step frequency with a handheld device, the frequency content of the handheld sensor’s signal is extracted by applying the Short Time Fourier Transform (STFT independently from the step detection process. The relationship between step and hand frequencies is analyzed for different hand’s motions and sensor carrying modes. For this purpose, the frequency content of synchronized signals collected with two sensors placed in the hand and on the foot of a pedestrian has been extracted. Performance of the proposed step length model is assessed with several field tests involving 10 test subjects different from the above 12. The percentages of error over the travelled distance using universal parameters and a set of parameters calibrated for each subject are compared. The fitted solutions show an error between 2.5 and 5% of the travelled distance, which is comparable with that achieved by models proposed in the literature for body fixed sensors only.

  11. Step length estimation using handheld inertial sensors.

    Science.gov (United States)

    Renaudin, Valérie; Susi, Melania; Lachapelle, Gérard

    2012-01-01

    In this paper a novel step length model using a handheld Micro Electrical Mechanical System (MEMS) is presented. It combines the user's step frequency and height with a set of three parameters for estimating step length. The model has been developed and trained using 12 different subjects: six men and six women. For reliable estimation of the step frequency with a handheld device, the frequency content of the handheld sensor's signal is extracted by applying the Short Time Fourier Transform (STFT) independently from the step detection process. The relationship between step and hand frequencies is analyzed for different hand's motions and sensor carrying modes. For this purpose, the frequency content of synchronized signals collected with two sensors placed in the hand and on the foot of a pedestrian has been extracted. Performance of the proposed step length model is assessed with several field tests involving 10 test subjects different from the above 12. The percentages of error over the travelled distance using universal parameters and a set of parameters calibrated for each subject are compared. The fitted solutions show an error between 2.5 and 5% of the travelled distance, which is comparable with that achieved by models proposed in the literature for body fixed sensors only.

  12. A Cognitive Style Perspective to Handheld Devices: Customization vs. Personalization

    Science.gov (United States)

    Hsieh, Chen-Wei; Chen, Sherry Y.

    2016-01-01

    Handheld devices are widely applied to support open and distributed learning, where students are diverse. On the other hand, customization and personalization can be applied to accommodate students' diversities. However, paucity of research compares the effects of customization and personalization in the context of handheld devices. To this end, a…

  13. Learning Object Design Considerations for Small-Screen Handheld Devices

    Science.gov (United States)

    Churchill, Daniel; Hedberg, John

    2008-01-01

    The key limitation of handheld technology for the delivery of learning objects is the small screen that is available for effective display. The smallness of the screen not only adversely affects the clarity, but it also negatively impacts on the acceptance and integration of this potentially useful technology in education. Handheld devices are…

  14. Visual SLAM for Handheld Monocular Endoscope.

    Science.gov (United States)

    Grasa, Óscar G; Bernal, Ernesto; Casado, Santiago; Gil, Ismael; Montiel, J M M

    2014-01-01

    Simultaneous localization and mapping (SLAM) methods provide real-time estimation of 3-D models from the sole input of a handheld camera, routinely in mobile robotics scenarios. Medical endoscopic sequences mimic a robotic scenario in which a handheld camera (monocular endoscope) moves along an unknown trajectory while observing an unknown cavity. However, the feasibility and accuracy of SLAM methods have not been extensively validated with human in vivo image sequences. In this work, we propose a monocular visual SLAM algorithm tailored to deal with medical image sequences in order to provide an up-to-scale 3-D map of the observed cavity and the endoscope trajectory at frame rate. The algorithm is validated over synthetic data and human in vivo sequences corresponding to 15 laparoscopic hernioplasties where accurate ground-truth distances are available. It can be concluded that the proposed procedure is: 1) noninvasive, because only a standard monocular endoscope and a surgical tool are used; 2) convenient, because only a hand-controlled exploratory motion is needed; 3) fast, because the algorithm provides the 3-D map and the trajectory in real time; 4) accurate, because it has been validated with respect to ground-truth; and 5) robust to inter-patient variability, because it has performed successfully over the validation sequences. PMID:24107925

  15. A hand-held immaterial volumetric display

    Science.gov (United States)

    Sand, Antti; Rakkolainen, Ismo

    2014-03-01

    We have created an ultralight, movable, "immaterial" fogscreen. It is based on the fogscreen mid-air imaging technology. The hand-held unit is roughly the size and weight of an ordinary toaster. If the screen is tracked, it can be swept in the air to create mid-air slices of volumetric objects, or to show augmented reality (AR) content on top of real objects. Interfacing devices and methodologies, such as hand and gesture trackers, camera-based trackers and object recognition, can make the screen interactive. The user can easily interact with any physical object or virtual information, as the screen is permeable. Any real objects can be seen through the screen, instead of e.g., through a video-based augmented reality screen. It creates a mixed reality setup where both the real world object and the augmented reality content can be viewed and interacted with simultaneously. The hand-held mid-air screen can be used e.g., as a novel collaborating or classroom tool for individual students or small groups.

  16. Visual SLAM for Handheld Monocular Endoscope.

    Science.gov (United States)

    Grasa, Óscar G; Bernal, Ernesto; Casado, Santiago; Gil, Ismael; Montiel, J M M

    2014-01-01

    Simultaneous localization and mapping (SLAM) methods provide real-time estimation of 3-D models from the sole input of a handheld camera, routinely in mobile robotics scenarios. Medical endoscopic sequences mimic a robotic scenario in which a handheld camera (monocular endoscope) moves along an unknown trajectory while observing an unknown cavity. However, the feasibility and accuracy of SLAM methods have not been extensively validated with human in vivo image sequences. In this work, we propose a monocular visual SLAM algorithm tailored to deal with medical image sequences in order to provide an up-to-scale 3-D map of the observed cavity and the endoscope trajectory at frame rate. The algorithm is validated over synthetic data and human in vivo sequences corresponding to 15 laparoscopic hernioplasties where accurate ground-truth distances are available. It can be concluded that the proposed procedure is: 1) noninvasive, because only a standard monocular endoscope and a surgical tool are used; 2) convenient, because only a hand-controlled exploratory motion is needed; 3) fast, because the algorithm provides the 3-D map and the trajectory in real time; 4) accurate, because it has been validated with respect to ground-truth; and 5) robust to inter-patient variability, because it has performed successfully over the validation sequences.

  17. Dex-ray: augmented reality neurosurgical navigation with a handheld video probe

    OpenAIRE

    Kockro, R A; Tsai, Y. T.(Department of Physics, National Taiwan University, 10617, Taipei, Taiwan); Hwang, P.; Zhu, C; Agusanto, K; Hong, L X; Serra, L

    2009-01-01

    OBJECTIVE: We developed an augmented reality system that enables intraoperative image guidance by using 3-dimensional (3D) graphics overlaid on a video stream. We call this system DEX-Ray and report on its development and the initial intraoperative experience in 12 cases. METHODS: DEX-Ray consists of a tracked handheld probe that integrates a lipstick-size video camera. The camera looks over the probe's tip into the surgical field. The camera's video stream is augmented with coregistered, mul...

  18. Handheld Multi-Gas Meters Assessment Report

    Energy Technology Data Exchange (ETDEWEB)

    Williams, Gustavious [Brigham Young Univ., Provo, UT (United States); Wald-Hopkins, Mark David [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Obrey, Stephen J. [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Akhadov, Valida Dushdurova [Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

    2016-06-27

    Handheld multi-gas meters (MGMs) are equipped with sensors to monitor oxygen (O2) levels and additional sensors to detect the presence of combustible or toxic gases in the environment. This report is limited to operational response-type MGMs that include at least four different sensors. These sensors can vary by type and by the monitored chemical. In real time, the sensors report the concentration of monitored gases in the atmosphere near the MGM. In April 2016 the System Assessment and Validation for Emergency Responders (SAVER) Program conducted an operationally-oriented assessment of MGMs. Five MGMs were assessed by emergency responders. The criteria and scenarios used in this assessment were derived from the results of a focus group of emergency responders with experience in using MGMs. The assessment addressed 16 evaluation criteria in four SAVER categories: Usability, Capability, Maintainability, and Deployability.

  19. Optimization of ATSC Mobile Handheld Service Capacity

    Directory of Open Access Journals (Sweden)

    Omneya Issa

    2013-01-01

    Full Text Available Mobile TV has become a reality offered on several mobile delivery systems. Among them is the Advanced Television System Committee (ATSC system for mobile and handheld digital television services, known as ATSC Mobile DTV or ATSC M/H, which has moved from standardization to implementation. As the North American broadcast industry is preparing to provide Mobile DTV service to consumers, this work discusses important technical parameters that affect the TV service quality and capacity. Since additional error correction mechanisms were added to overcome mobile transmission problems, the available payload for M/H services is limited. This creates a need to efficiently use the available M/H bandwidth. The paper aims to optimize the Mobile DTV service capacity while maintaining an acceptable perceived quality. It presents tradeoffs between several factors affecting service capacity and signal robustness, which is prominent for designing Mobile TV broadcasting scenarios.

  20. Optical links in handheld multimedia devices

    Science.gov (United States)

    van Geffen, S.; Duis, J.; Miller, R.

    2008-04-01

    Ever emerging applications in handheld multimedia devices such as mobile phones, laptop computers, portable video games and digital cameras requiring increased screen resolutions are driving higher aggregate bitrates between host processor and display(s) enabling services such as mobile video conferencing, video on demand and TV broadcasting. Larger displays and smaller phones require complex mechanical 3D hinge configurations striving to combine maximum functionality with compact building volumes. Conventional galvanic interconnections such as Micro-Coax and FPC carrying parallel digital data between host processor and display module may produce Electromagnetic Interference (EMI) and bandwidth limitations caused by small cable size and tight cable bends. To reduce the number of signals through a hinge, the mobile phone industry, organized in the MIPI (Mobile Industry Processor Interface) alliance, is currently defining an electrical interface transmitting serialized digital data at speeds >1Gbps. This interface allows for electrical or optical interconnects. Above 1Gbps optical links may offer a cost effective alternative because of their flexibility, increased bandwidth and immunity to EMI. This paper describes the development of optical links for handheld communication devices. A cable assembly based on a special Plastic Optical Fiber (POF) selected for its mechanical durability is terminated with a small form factor molded lens assembly which interfaces between an 850nm VCSEL transmitter and a receiving device on the printed circuit board of the display module. A statistical approach based on a Lean Design For Six Sigma (LDFSS) roadmap for new product development tries to find an optimum link definition which will be robust and low cost meeting the power consumption requirements appropriate for battery operated systems.

  1. Evaluating change in user error when using ruggedized handheld devices.

    Science.gov (United States)

    Cannon, Angela Brooke; Strawderman, Lesley; Burch, Reuben

    2015-11-01

    The increasing number of handheld mobile devices used today and the increasing dependency on them in the workplace makes understanding how users interact with these devices critical. This study seeks to understand how user error changes based on user age as well as input content type on ruggedized handheld devices. Participants completed data entry tasks of word and character input on two different devices, a physical keypad and touchscreen device. The number of errors and types of error, corrected and permanent were collected for each participant. Based on results on the study, touchscreen devices proved to be the optimal ruggedized handheld device to minimize user error.

  2. Arbeidsbehoefte handheld-computer versus schriftelijke registratie van aandoeningen

    NARCIS (Netherlands)

    Ramaekers, P.J.L.; Huiskes, J.H.; Langelaan, I.S.

    1996-01-01

    In een tijdstudie zijn de arbeidsbehoefte voor de registratie van aandoeningen en behandelingen bij vleesvarkens via een handheld-computer en de arbeidsbehoefte bij een schriftelijke registratiemethode met elkaar vergeleken

  3. Handheld FRET-Aptamer Sensor for Water Safety Project

    Data.gov (United States)

    National Aeronautics and Space Administration — Operational Technologies Corporation (OpTech) proposes to expand its current NASA Phase 2 SBIR handheld fluorometer and bone marker fluorescence resonance energy...

  4. Electronic, Hand-Held, Wireless Text-And-Graphics Viewer

    Science.gov (United States)

    Palumbo, Daniel L.

    1994-01-01

    Proposed electronic, hand-held, wireless viewer presents written material to reader in way that closely resembles that of paper reading material. Viewer presents text and graphics like those normally found in books, newspapers, and magazines. Its hand-held and wireless features enable it to be used in positions and areas where books and magazines are normally used. Device consists primarily of two parts: the receiver/information store and viewing screen.

  5. Handheld X-ray Fluorescence Spectrometers: Radiation Exposure Risks of Matrix-Specific Measurement Scenarios.

    Science.gov (United States)

    Rouillon, Marek; Kristensen, Louise J; Gore, Damian B

    2015-07-01

    This study investigates X-ray intensity and dispersion around handheld X-ray fluorescence (XRF) instruments during the measurement of a range of sample matrices to establish radiation exposure risk during operation. Four handheld XRF instruments representing three manufacturers were used on four smooth, flat-lying materials of contrasting matrix composition. Dose rates were measured at 10, 20, 30, and 40 cm intervals every 30° around the instrument at 0 and 45° from the horizontal, as well as vertically from the instrument screen. The analysis of polyethylene recorded dose rates 156 times higher (on average) than steel measurements and 34 times higher than both quartz sand and quartz sandstone. A worst-case exposure scenario was assumed where a user analyses a polyethylene material at arms reach for 1 h each working day for one year. This scenario resulted in an effective body dose of 73.5 μSv, equivalent to three to four chest X-rays (20 μSv) a year, 20 times lower than the average annual background radiation exposure in Australia and well below the annual exposure limit of 1 mSv for non-radiation workers. This study finds the advantages of using handheld XRF spectrometers far outweighs the risk of low radiation exposure linked to X-ray scattering from samples. PMID:26037330

  6. Portable Handheld Optical Window Inspection Device

    Science.gov (United States)

    Ihlefeld, Curtis; Dokos, Adam; Burns, Bradley

    2010-01-01

    The Portable Handheld Optical Window Inspection Device (PHOWID) is a measurement system for imaging small defects (scratches, pits, micrometeor impacts, and the like) in the field. Designed primarily for window inspection, PHOWID attaches to a smooth surface with suction cups, and raster scans a small area with an optical pen in order to provide a three-dimensional image of the defect. PHOWID consists of a graphical user interface, motor control subsystem, scanning head, and interface electronics, as well as an integrated camera and user display that allows a user to locate minute defects before scanning. Noise levels are on the order of 60 in. (1.5 m). PHOWID allows field measurement of defects that are usually done in the lab. It is small, light, and attaches directly to the test article in any orientation up to vertical. An operator can scan a defect and get useful engineering data in a matter of minutes. There is no need to make a mold impression for later lab analysis.

  7. Handheld-Level Electromechanical Cartilage Reshaping Device.

    Science.gov (United States)

    Kim, Sehwan; Manuel, Cyrus T; Wong, Brian J F; Chung, Phil-Sang; Mo, Ji-Hun

    2015-06-01

    We have developed a handheld-level multichannel electromechanical reshaping (EMR) cartilage device and evaluated the feasibility of providing a means of cartilage reshaping in a clinical outpatient setting. The effect of EMR on pig costal cartilage was evaluated in terms of shape change, tissue heat generation, and cell viability. The pig costal cartilage specimens (23 mm × 6.0 mm × 0.7 mm) were mechanically deformed to 90 degrees and fixed to a plastic jig and applied 5, 6, 7, and 8 V up to 8 minutes to find the optimal dosimetry for the our developed EMR device. The results reveal that bend angle increased with increasing voltage and application time. The maximum bend angle obtained was 70.5 ± 7.3 at 8 V, 5 minutes. The temperature of flat pig costal cartilage specimens were measured, while a constant electric voltage was applied to three pairs of electrodes that were inserted into the cartilages. The nonthermal feature of EMR was validated by a thermal infrared camera; that is, the maximum temperate of the flat cartilages is 20.3°C at 8 V. Cell viability assay showed no significant difference in cell damaged area from 3 to 7 minutes exposure with 7 V. In conclusion, the multichannel EMR device that was developed showed a good feasibility of cartilage shaping with minimal temperature change. PMID:26126226

  8. Hand-held optical fuel pin scanner

    International Nuclear Information System (INIS)

    A portable, hand-held apparatus is described for optically scanning indicia imprinted about a planar end face of an article having an outer wall surface, the apparatus comprising: a supporting frame; light detector means fixed to the frame for digitizing light patterns directed thereto; indexing means on the frame for engaging the planar end face and locating the end face in a preselected focal plane on the frame. The indexing means has an inner wall surface complementary to the article wall surface for disposition thereabout and terminates in an end portion beyond the planar end face. The inner wall surface has a radially inwardly extending shoulder spaced from the end portion and engageable with the planar end face; light means directed onto the preselected focal plane; optical means mounted on the frame about a central axis, the optical means being optically interposed between the indexing means and the light detector means for directing reflected light from the preselected focal plane to the light detector means and including a dove prism centrally aligned along the central axis; and means for selectively rotating the dove prism relative to the frame about the central axis to thereby rotate the image from the focal plane as transmitted to the light detector means

  9. Introducing Handheld Computing for Interactive Medical Education

    Directory of Open Access Journals (Sweden)

    Joseph Finkelstein

    2005-04-01

    Full Text Available The goals of this project were: (1 development of an interactive multimedia medical education tool (CO-ED utilizing modern features of handheld computing (PDA and major constructs of adult learning theories, and (2 pilot testing of the computer-assisted education in residents and clinicians. Comparison of the knowledge scores using paired t-test demonstrated statistically significant increase in subject knowledge (p<0.01 after using CO-ED. Attitudinal surveys were analyzed by total score (TS calculation represented as a percentage of a maximal possible score. The mean TS was 74.5±7.1%. None of the subjects (N=10 had TS less than 65% and in half of the subjects (N=5 TS was higher than 75%. Analysis of the semi-structured in-depth interviews showed strong support of the study subjects in using PDA as an educational tool, and high acceptance of CO-ED user interface. We concluded that PDA have a significant potential as a tool for clinician education.

  10. An Adaptive Geometry Game for Handheld Devices

    Directory of Open Access Journals (Sweden)

    Harri Ketamo

    2003-01-01

    Full Text Available The development of adaptive learning systems is only in the very beginning. In fact, the concept of adaptive learning systems range from different user interfaces to behaviour adaptive systems as well as from the place and time independent systems to terminal independent systems. When approaching the concept of adaptive learning materials, we must first have conceptual models of the behaviour of different learners within digital environments.The aim of this study was to develop a geometry learning game that adapts to user’s behaviour. The learners in this study were six years old Finnish pre-school pupils. The adaptive system was very limited and the observed behaviour was defined as very simple. However, the software developed achieves good learning results among the tested pupils. The study shows that the learning effect is very promising with this kind of handheld platform and simple adaptation system. This study gives good visions of what can be achieved with more complex behaviour adaptive systems in the field of eLearning.

  11. An analysis of sweep patterns for a handheld demining system

    Science.gov (United States)

    Wilson, J. N.; Gader, P. D.; Ho, K. C.; Mazhar, R.

    2006-05-01

    Handheld sensors are commonly used to assist in landmine location and removal. A number of computer systems aimed at assisting humans in discriminating between buried mines and other objects have been developed. Each such system requires some protocol that involves sweeping the sensor over a region of ground using some set of patterns to search for objects (detection) and determine the nature of those objects (discrimination). The work reported here is an effort to determine an acceptable sweep pattern for mine/nonmine discrimination that provides good performance while still being simple for the operator to use. The paper describes a series of data collections and case studies employing a combined radar and metal detection sensor. The system was evaluated first using a robotic operator and later human operators. We discuss the application of a supervised learning system discriminator to each data set, and evaluate discrimination performance. We found that using a relatively simple sweep pattern, computer algorithms can achieve better discrimination performance than an expert human operator, and that (at least up to ten sweeps) our computer algorithm performs better with more sweeps over target.

  12. Potential role of a new hand-held miniature gamma camera in performing minimally invasive parathyroidectomy

    Energy Technology Data Exchange (ETDEWEB)

    Ortega, Joaquin; Lledo, Salvador [University of Valencia, Clinic University Hospital, Department of Surgery, Valencia (Spain); Ferrer-Rebolleda, Jose [Clinic University Hospital, Department of Nuclear Medicine, Valencia (Spain); Cassinello, Norberto [Clinic University Hospital, Unit of Endocrinologic and Bariatric Surgery, Valencia (Spain)

    2007-02-15

    Sestamibi scans have increased the use of minimally invasive parathyroidectomy (MIP) to treat primary hyperparathyroidism (PHPT) when caused by a parathyroid single adenoma. The greatest concern for surgeons remains the proper identification of pathological glands in a limited surgical field. We have studied the usefulness of a new hand-held miniature gamma camera (MGC) when used intraoperatively to locate parathyroid adenomas. To our knowledge this is the first report published on this subject in the scientific literature. Five patients with PHPT secondary to a single adenoma, positively diagnosed by preoperative sestamibi scans, underwent a MIP. A gamma probe for radioguided surgery and the new hand-held MGC were used consecutively to locate the pathological glands. This new MGC has a module composed of a high-resolution interchangeable collimator and a CsI(Na) scintillating crystal. It has dimensions of around 15 cm x 8 cm x 9 cm and weighs 1 kg. The intraoperative assay of PTH (ioPTH) was used to confirm the complete resection of pathological tissue. All cases were operated on successfully by a MIP. The ioPTH confirmed the excision of all pathological tissues. The MGC proved its usefulness in all patients, even in a difficult case in which the first attempt with the gamma probe failed. In all cases it offered real-time accurate intraoperative images. The hand-held MGC is a useful instrument in MIP for PHPT. It may be used to complement the standard tools used to date, or may even replace them, at least in selected cases of single adenomas. (orig.)

  13. A novel fully integrated handheld gamma camera

    Science.gov (United States)

    Massari, R.; Ucci, A.; Campisi, C.; Scopinaro, F.; Soluri, A.

    2016-10-01

    In this paper, we present an innovative, fully integrated handheld gamma camera, namely designed to gather in the same device the gamma ray detector with the display and the embedded computing system. The low power consumption allows the prototype to be battery operated. To be useful in radioguided surgery, an intraoperative gamma camera must be very easy to handle since it must be moved to find a suitable view. Consequently, we have developed the first prototype of a fully integrated, compact and lightweight gamma camera for radiopharmaceuticals fast imaging. The device can operate without cables across the sterile field, so it may be easily used in the operating theater for radioguided surgery. The prototype proposed consists of a Silicon Photomultiplier (SiPM) array coupled with a proprietary scintillation structure based on CsI(Tl) crystals. To read the SiPM output signals, we have developed a very low power readout electronics and a dedicated analog to digital conversion system. One of the most critical aspects we faced designing the prototype was the low power consumption, which is mandatory to develop a battery operated device. We have applied this detection device in the lymphoscintigraphy technique (sentinel lymph node mapping) comparing the results obtained with those of a commercial gamma camera (Philips SKYLight). The results obtained confirm a rapid response of the device and an adequate spatial resolution for the use in the scintigraphic imaging. This work confirms the feasibility of a small gamma camera with an integrated display. This device is designed for radioguided surgery and small organ imaging, but it could be easily combined into surgical navigation systems.

  14. Advances in handheld FT-IR instrumentation

    Science.gov (United States)

    Arnó, Josep; Cardillo, Len; Judge, Kevin; Frayer, Maxim; Frunzi, Michael; Hetherington, Paul; Levy, Dustin; Oberndorfer, Kyle; Perec, Walter; Sauer, Terry; Stein, John; Zuidema, Eric

    2012-06-01

    FT-IR spectroscopy is the technology of choice to identify solid and liquid phase unknown samples. The challenges of ConOps (Concepts of Operation) in emergency response and military field applications require a significant redesign of the stationary FT-IR bench-top instruments typically used in laboratories. Specifically, field portable units require high levels of resistance against mechanical shock and chemical attack, ease of use in restrictive gear, quick and easy interpretation of results, and reduced size. In the last 20 years, FT-IR instruments have been re-engineered to fit in small suitcases for field portable use and recently further miniaturized for handheld operation. This article introduces the advances resulting from a project designed to overcome the challenges associated with miniaturizing FT-IR instruments. The project team developed a disturbance-corrected permanently aligned cube corner interferometer for improved robustness and optimized opto-mechanical design to maximize optical throughput and signal-to-noise ratios. Thermal management and heat flow were thoroughly modeled and studied to isolate sensitive components from heat sources and provide the widest temperature operation range. Similarly, extensive research on mechanical designs and compensation techniques to protect against shock and vibration will be discussed. A user interface was carefully created for military and emergency response applications to provide actionable information in a visual, intuitive format. Similar to the HazMatID family of products, state-of-the-art algorithms were used to quickly identify the chemical composition of complex samples based on the spectral information. This article includes an overview of the design considerations, tests results, and performance validation of the mechanical ruggedness, spectral, and thermal performance.

  15. Undergraduate student experiences in context-aware educational uses of handheld devices

    OpenAIRE

    Song, Y.

    2006-01-01

    Ms Song Yanjie, a PhD candidate, reviews the current literature concerning handheld educational applications, discusses the opportunities and challenges of handheld devices for educational purposes and outlines a qualitative research study into undergraduate student experiences in context-aware educational uses of handheld devices.

  16. 75 FR 27504 - Substantial Product Hazard List: Hand-Held Hair Dryers

    Science.gov (United States)

    2010-05-17

    ... COMMISSION 16 CFR Part 1120 Substantial Product Hazard List: Hand-Held Hair Dryers AGENCY: Consumer Product... this document, the Commission is proposing a rule to determine that any hand-held hair dryer without... requirements for certain household appliances, including hand-held hair dryers. The current...

  17. 78 FR 27441 - NIJ Evaluation of Hand-Held Cell Phone Detector Devices

    Science.gov (United States)

    2013-05-10

    ... of Justice Programs NIJ Evaluation of Hand-Held Cell Phone Detector Devices AGENCY: National...) is soliciting interest in supplying hand-held cell phone detector devices for participation in an... soliciting interest in supplying hand-held cell phone detector devices for participation in an evaluation...

  18. Handheld technology acceptance in radiologic science education and training programs

    Science.gov (United States)

    Powers, Kevin Jay

    The purpose of this study was to explore the behavioral intention of directors of educational programs in the radiologic sciences to adopt handheld devices to aid in managing student clinical data. Handheld devices were described to participants as a technology representing a class of mobile electronic devices including, but not limited to, personal digital assistants such as a Palm TX, Apple iPod Touch, Apple iPad or Hewlett Packard iPaq, and cellular or smartphones with third generation mobile capabilities such as an Apple iPhone, Blackberry or Android device. The study employed a non-experimental, cross-sectional survey design to determine the potential of adopting handheld technologies based on the constructs of Davis's (1989) Technology Acceptance Model. An online self-report questionnaire survey instrument was used to gather study data from 551 entry level radiologic science programs specializing in radiography, radiation therapy, nuclear medicine and medical sonography. The study design resulted in a single point in time assessment of the relationship between the primary constructs of the Technology Acceptance Model: perceived usefulness and perceived ease of use, and the behavioral intention of radiography program directors to adopt the information technology represented by hand held devices. Study results provide justification for investing resources to promote the adoption of mobile handheld devices in radiologic science programs and study findings serve as a foundation for further research involving technology adoption in the radiologic sciences.

  19. Diagnostic efficacy of handheld devices for emergency radiologic consultation.

    LENUS (Irish Health Repository)

    Toomey, Rachel J

    2010-02-01

    Orthopedic injury and intracranial hemorrhage are commonly encountered in emergency radiology, and accurate and timely diagnosis is important. The purpose of this study was to determine whether the diagnostic accuracy of handheld computing devices is comparable to that of monitors that might be used in emergency teleconsultation.

  20. Technology-enabled division of labour: the use of handhelds

    NARCIS (Netherlands)

    Benders, J.G.J.M.; Schouteten, R.L.J.; Ruijsscher, C. de

    2012-01-01

    Using the task pool model and data from 15 establishments in the Dutch hospitality industry, this study shows how and why applying handhelds affects the division of labour. These devices allow to split the waiters' jobs into separate tasks which tend to be combined into two separate "sub jobs": the

  1. Development of Handheld Multispectral Imaging For Food Safety Inspection

    Science.gov (United States)

    The objective of this research was to develop a handheld multispectral instrument for food safety inspection for poultry carcasses. The prototype system developed in this research consisted of a compact dual-band spectral imaging system, Light Emitting diode (LED), and portable computer. The dual-...

  2. Human Handheld-Device Interaction: An Adaptive User Interface

    NARCIS (Netherlands)

    Fitrianie, S.

    2010-01-01

    The move to smaller, lighter and more powerful (mobile) handheld devices, whe-ther PDAs or smart-phones, looks like a trend that is building up speed. With numerous embedded technologies and wireless connectivity, the drift opens up unlimited opportunities in daily activities that are both more effi

  3. Hand-Held Ultrasonic Instrument for Reading Matrix Symbols

    Science.gov (United States)

    Schramm, Harry F.; Kula, John P.; Gurney, John W.; Lior, Ephraim D.

    2008-01-01

    A hand-held instrument that would include an ultrasonic camera has been proposed as an efficient means of reading matrix symbols. The proposed instrument could be operated without mechanical raster scanning. All electronic functions from excitation of ultrasonic pulses through final digital processing for decoding matrix symbols would be performed by dedicated circuitry within the single, compact instrument housing.

  4. Epilepsy Forewarning Using A Hand-Held Device

    Energy Technology Data Exchange (ETDEWEB)

    Hively, LM

    2005-02-21

    Over the last decade, ORNL has developed and patented a novel approach for forewarning of a large variety of machine and biomedical events. The present implementation uses desktop computers to analyze archival data. This report describes the next logical step in this effort, namely use of a hand-held device for the analysis.

  5. Hand-held pulse-train-analysis instrument

    International Nuclear Information System (INIS)

    A portable hand-held pulse-train-analysis instrument uses a number-oriented microprocessor sequenced by a single component microprocessor. The incorporation of new CMOS integrated circuits makes possible complex analysis in a small, easily operated, battery-powered unit. The instrument solves an immediate problem with threshold setting of plastic scintillators and promises numerous other applications

  6. Imaging Emission Spectra with Handheld and Cellphone Cameras

    Science.gov (United States)

    Sitar, David

    2012-01-01

    As point-and-shoot digital camera technology advances it is becoming easier to image spectra in a laboratory setting on a shoestring budget and get immediate results. With this in mind, I wanted to test three cameras to see how their results would differ. Two undergraduate physics students and I used one handheld 7.1 megapixel (MP) digital Cannon…

  7. Data for Users of Handheld Ion Mobility Spectrometers

    Energy Technology Data Exchange (ETDEWEB)

    Keith A. Daum; Sandra L. Fox

    2008-05-01

    Chemical detection technology end-user surveys conducted by Idaho National Laboratory (INL) in 2005 and 2007 indicated that first responders believed manufacturers’ claims for instruments sometimes were not supported in field applications, and instruments sometimes did not meet their actual needs. Based on these findings, the Department of Homeland Security (DHS) asked INL to conduct a similar survey for handheld ion mobility spectrometers (IMS), which are used by a broad community of first responders as well as for other applications. To better access this broad community, the INL used the Center for Technology Commercialization, Inc. (CTC), Public Safety Technology Center (PSTC) to set up an online framework to gather information from users of handheld IMS units. This framework (Survey Monkey) was then used to perform an online Internet survey, augmented by e-mail prompts, to get information from first responders and personnel from various agencies about their direct experience with handheld IMS units. Overall, 478 individuals responded to the survey. Of these, 174 respondents actually owned a handheld IMS. Performance and satisfaction data from these 174 respondents are captured in this report. The survey identified the following observations: • The most common IMS unit used by respondents was the Advanced Portable Detector (APD 2000), followed by ChemRae, Sabre 4000, Sabre 2000, Draeger Multi IMS, Chemical Agent Monitor-2, Chemical Agent Monitor, Vapor Tracer, and Vapor Tracer 2. • The primary owners were HazMat teams (20%), fire services (14%), local police (12%), and sheriffs’ departments (9%). • IMS units are seldom used as part of an integrated system for detecting and identifying chemicals but instead are used independently. • Respondents are generally confused about the capabilities of their IMS unit. This is probably a result of lack of training. • Respondents who had no training or fewer than 8 hours were not satisfied with the overall

  8. Quantitative Chemical Analysis of Archaeological Slag Material Using Handheld X-ray Fluorescence Spectrometry.

    Science.gov (United States)

    Scott, Rebecca B; Eekelers, Kim; Degryse, Patrick

    2016-01-01

    Handheld X-ray fluorescence spectrometry (XRF) has seen a dramatic increase in use for archaeological projects. The attraction of the technique is its portable and nondestructive nature. In many cases, the archaeological artefacts in question cannot be destructively sampled, or the piece itself cannot be sent to an analytical laboratory. One of the current research interests associated with the Sagalassos project is the study of the Roman iron industry. Previously exported iron slag and ore from the site and the surrounding area was subjected to laboratory chemical analyses. These indicated that different ores were being utilized in the production of iron in different periods. In order to further the project the slag material still in the site depot needed to be analyzed. However, recent legislative changes mean that materials can only be analyzed on-site. Since samples could not be taken and destructive chemical analysis was no longer feasible, a portable, nondestructive technique was required. Handheld XRF can easily provide qualitative data, but these data are only comparable to other handheld XRF qualitative data, from the same device. Quantitative data gathering is possible, but can be more problematic, particularly when the material in question is heterogeneous in nature. A calibration file was created using the manufacturer's software and "in-house" standards made from the pre-quantified samples of iron slag available in the laboratory. In order to make the calibration as robust as possible, the composition of the standards was analyzed statistically to determine which of these created bias and leverage for specific elements. These standards were then omitted from the calibration for that element. The calibration was tested in the laboratory using samples of iron slag previously analyzed with wet chemistry, and the results indicated that most sample analyses showed 30% error were found in samples which contained very low or very high quantities of the

  9. RGB-D Hand-Held Ob ject Recognition Based on Heterogeneous Feature Fusion

    Institute of Scientific and Technical Information of China (English)

    吕雄; 蒋树强; 王双

    2015-01-01

    Ob ject recognition has many applications in human-machine interaction and multimedia retrieval. However, due to large intra-class variability and inter-class similarity, accurate recognition relying only on RGB data is still a big challenge. Recently, with the emergence of inexpensive RGB-D devices, this challenge can be better addressed by leveraging additional depth information. A very special yet important case of object recognition is hand-held object recognition, as manipulating objects with hands is common and intuitive in human-human and human-machine interactions. In this paper, we study this problem and introduce an effective framework to address it. This framework first detects and segments the hand-held ob ject by exploiting skeleton information combined with depth information. In the ob ject recognition stage, this work exploits heterogeneous features extracted from different modalities and fuses them to improve the recognition accuracy. In particular, we incorporate handcrafted and deep learned features and study several multi-step fusion variants. Experimental evaluations validate the effectiveness of the proposed method.

  10. Handheld and portable test systems for decentralized testing: from lab to marketplace

    Science.gov (United States)

    Faulstich, Konrad; Haberstroh, Klaus

    2009-05-01

    Emergency Diagnostics, Homeland Security, Epidemiological Preparedness and the high cost of the Health Care Systems have increased demand for affordable and mobile point of care (POC) devices with highest sensitivity, specificity and rapid time to result. We have developed pocket and brief case sized systems for point of care and field based tests based on fluorescence read-out. The core consists of battery operated, 90 gram electro-optical units with optional wireless data transfer, which have been optimized to achieve highest accuracy and sensitivity combined with simplicity of use. The robust systems have been applied to molecular diagnostics such as DNA based testing, immunodiagnostics as well as environmental monitoring and agricultural testing. Starting with the current bottlenecks of in-vitro diagnostics testing and a brief market overview, we will show commercially available portable test systems for molecular diagnostics and how we solve the current bottlenecks. We will further show battery operated handheld prototypes for DNA testing. ESE's handheld and portable testing platforms have been shown to provide sensitive, accurate, and specific results, as well as rapid turnaround. The stand-alone devices demonstrate operational and physical robustness, and they can be manufactured to be affordable.

  11. Strength and Pain Threshold Handheld Dynamometry Test Reliability in Patellofemoral Pain.

    Science.gov (United States)

    van der Heijden, R A; Vollebregt, T; Bierma-Zeinstra, S M A; van Middelkoop, M

    2015-12-01

    Patellofemoral pain syndrome (PFPS), characterized by peri- and retropatellar pain, is a common disorder in young, active people. The etiology is unclear; however, quadriceps strength seems to be a contributing factor, and sensitization might play a role. The study purpose is determining the inter-rater reliability of handheld dynamometry to test both quadriceps strength and pressure pain threshold (PPT), a measure for sensitization, in patients with PFPS. This cross-sectional case-control study comprises 3 quadriceps strength and one PPT measurements performed by 2 independent investigators in 22 PFPS patients and 16 matched controls. Inter-rater reliability was analyzed using intraclass correlation coefficients (ICC) and Bland-Altman plots. Inter-rater reliability of quadriceps strength testing was fair to good in PFPS patients (ICC=0.72) and controls (ICC=0.63). Bland-Altman plots showed an increased difference between assessors when average quadriceps strength values exceeded 250 N. Inter-rater reliability of PPT was excellent in patients (ICC=0.79) and fair to good in controls (ICC=0.52). Handheld dynamometry seems to be a reliable method to test both quadriceps strength and PPT in PFPS patients. Inter-rater reliability was higher in PFPS patients compared to control subjects. With regard to quadriceps testing, a higher variance between assessors occurs when quadriceps strength increases. PMID:26422052

  12. Marker-Based Embodied Interaction for Handheld Augmented Reality Games

    Directory of Open Access Journals (Sweden)

    Michael Rohs

    2007-05-01

    Full Text Available This article deals with embodied user interfaces for handheld augmented reality games, which consist of both physical and virtual components. We have developed a number of spatial interaction techniques that optically capture the device’s movement and orientation relative to a visual marker. Such physical interactions in 3D space enable manipulative control of mobile games. In addition to acting as a physical controller that recognizes multiple game-dependent gestures, the mobile device augments the camera view with graphical overlays. We describe three game prototypes that use ubiquitous product packaging and other passive media as backgrounds for handheld augmentation. The prototypes can be realized on widely available off-the-shelf hardware and require only minimal setup and infrastructure support.

  13. Handheld Multi-Gas Meters Market Survey Report

    Energy Technology Data Exchange (ETDEWEB)

    Williams, Gustavious [Brigham Young Univ., Provo, UT (United States); Wald-Hopkins, Mark David [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Obrey, Stephen J. [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Akhadov, Valida Dushdurova [Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

    2016-06-23

    Handheld multi-gas meters (MGMs) are equipped with sensors to monitor oxygen (O2) levels and additional sensors to detect the presence of combustible or toxic gases in the environment. This report is limited to operational response-type MGMs that include at least four different sensors. These sensors can vary by type and by the chemical monitored. In real time, the sensors report the concentration of monitored gases in the atmosphere near the MGM. To provide emergency responders with information on handheld multi-gas meters, the System Assessment and Validation for Emergency Responders (SAVER) Program conducted a market survey. This market survey report is based on information gathered between November 2015 and February 2016 from vendors, Internet research, industry publications, an emergency responder focus group, and a government issued Request for Information (RFI) that was posted on the Federal Business Opportunities website.

  14. Integrating RFID technique to design mobile handheld inventory management system

    Science.gov (United States)

    Huang, Yo-Ping; Yen, Wei; Chen, Shih-Chung

    2008-04-01

    An RFID-based mobile handheld inventory management system is proposed in this paper. Differing from the manual inventory management method, the proposed system works on the personal digital assistant (PDA) with an RFID reader. The system identifies electronic tags on the properties and checks the property information in the back-end database server through a ubiquitous wireless network. The system also provides a set of functions to manage the back-end inventory database and assigns different levels of access privilege according to various user categories. In the back-end database server, to prevent improper or illegal accesses, the server not only stores the inventory database and user privilege information, but also keeps track of the user activities in the server including the login and logout time and location, the records of database accessing, and every modification of the tables. Some experimental results are presented to verify the applicability of the integrated RFID-based mobile handheld inventory management system.

  15. Applicability of a Diffuse Reflectance Infrared Fourier Transform handheld spectrometer to perform in situ analyses on Cultural Heritage materials.

    Science.gov (United States)

    Arrizabalaga, Iker; Gómez-Laserna, Olivia; Aramendia, Julene; Arana, Gorka; Madariaga, Juan Manuel

    2014-08-14

    This work studies the applicability of a Diffuse Reflectance Infrared Fourier Transform handheld device to perform in situ analyses on Cultural Heritage assets. This portable diffuse reflectance spectrometer has been used to characterise and diagnose the conservation state of (a) building materials of the Guevara Palace (15th century, Segura, Basque Country, Spain) and (b) different 19th century wallpapers manufactured by the Santa Isabel factory (Vitoria-Gasteiz, Basque Country, Spain) and by the well known Dufour and Leroy manufacturers (Paris, France), all of them belonging to the Torre de los Varona Castle (Villanañe, Basque Country, Spain). In all cases, in situ measurements were carried out and also a few samples were collected and measured in the laboratory by diffuse reflectance spectroscopy (DRIFT) in order to validate the information obtained by the handheld instrument. In the analyses performed in situ, distortions in the diffuse reflectance spectra can be observed due to the presence of specular reflection, showing the inverted bands caused by the Reststrahlen effect, in particular on those IR bands with the highest absorption coefficients. This paper concludes that the results obtained in situ by a diffuse reflectance handheld device are comparable to those obtained with laboratory diffuse reflectance spectroscopy equipment and proposes a few guidelines to acquire good spectra in the field, minimising the influence caused by the specular reflection.

  16. Wireless Handheld Computers in the Undergraduate Medical Curriculum

    OpenAIRE

    Jackson, Matt; Ganger, Anand C.; Bridge, Patrick D.; Ginsburg, Kenneth

    2009-01-01

    Wayne State University Medical School has implemented wireless handheld computers or PocketPCs (PPCs) into all four years of the undergraduate curriculum. A transition from a passive to an interactive learning environment in the classroom, as well as administrative solutions for monitoring patient encounter data by students in their clinical rotations was fostered by this educational technology. Implementation of the wireless devices into the curriculum will be described in this report. This ...

  17. Elemental analysis using a handheld X-Ray fluorescence spectrometer

    Science.gov (United States)

    Groover, Krishangi; Izbicki, John

    2016-06-24

    The U.S. Geological Survey is collecting geologic samples from local stream channels, aquifer materials, and rock outcrops for studies of trace elements in the Mojave Desert, southern California. These samples are collected because geologic materials can release a variety of elements to the environment when exposed to water. The samples are to be analyzed with a handheld X-ray fluorescence (XRF) spectrometer to determine the concentrations of up to 27 elements, including chromium.

  18. Ball Lens Fiber Optic Sensor based Smart Handheld Microsurgical Instrument

    OpenAIRE

    Song, Cheol; Gehlbach, Peter L.; Kang, Jin U.

    2013-01-01

    During freehand performance of vitreoretinal microsurgery the surgeon must perform precise and stable maneuvers that achieve surgical objectives and avoid surgical risk. Here, we present an improved smart handheld microsurgical tool which is based on a ball lens fiber optic sensor that utilizes common path swept source optical coherence tomography. Improvements include incorporation of a ball lens single mode fiber optic probe that increases the working angle of the tool to greater than 45 de...

  19. Identification of handheld objects for electro-optic/FLIR applications

    Science.gov (United States)

    Moyer, Steve K.; Flug, Eric; Edwards, Timothy C.; Krapels, Keith A.; Scarbrough, John

    2004-08-01

    This paper describes research on the determination of the fifty-percent probability of identification cycle criterion (N50) for two sets of handheld objects. The first set consists of 12 objects which are commonly held in a single hand. The second set consists of 10 objects commonly held in both hands. These sets consist of not only typical civilian handheld objects but also objects that are potentially lethal. A pistol, a cell phone, a rocket propelled grenade (RPG) launcher, and a broom are examples of the objects in these sets. The discrimination of these objects is an inherent part of homeland security, force protection, and also general population security. Objects were imaged from each set in the visible and mid-wave infrared (MWIR) spectrum. Various levels of blur are then applied to these images. These blurred images were then used in a forced choice perception experiment. Results were analyzed as a function of blur level and target size to give identification probability as a function of resolvable cycles on target. These results are applicable to handheld object target acquisition estimates for visible imaging systems and MWIR systems. This research provides guidance in the design and analysis of electro-optical systems and forward-looking infrared (FLIR) systems for use in homeland security, force protection, and also general population security.

  20. Detecting buried explosive hazards with handheld GPR and deep learning

    Science.gov (United States)

    Besaw, Lance E.

    2016-05-01

    Buried explosive hazards (BEHs), including traditional landmines and homemade improvised explosives, have proven difficult to detect and defeat during and after conflicts around the world. Despite their various sizes, shapes and construction material, ground penetrating radar (GPR) is an excellent phenomenology for detecting BEHs due to its ability to sense localized differences in electromagnetic properties. Handheld GPR detectors are common equipment for detecting BEHs because of their flexibility (in part due to the human operator) and effectiveness in cluttered environments. With modern digital electronics and positioning systems, handheld GPR sensors can sense and map variation in electromagnetic properties while searching for BEHs. Additionally, large-scale computers have demonstrated an insatiable appetite for ingesting massive datasets and extracting meaningful relationships. This is no more evident than the maturation of deep learning artificial neural networks (ANNs) for image and speech recognition now commonplace in industry and academia. This confluence of sensing, computing and pattern recognition technologies offers great potential to develop automatic target recognition techniques to assist GPR operators searching for BEHs. In this work deep learning ANNs are used to detect BEHs and discriminate them from harmless clutter. We apply these techniques to a multi-antennae, handheld GPR with centimeter-accurate positioning system that was used to collect data over prepared lanes containing a wide range of BEHs. This work demonstrates that deep learning ANNs can automatically extract meaningful information from complex GPR signatures, complementing existing GPR anomaly detection and classification techniques.

  1. Concept for tremor compensation for a handheld OCT-laryngoscope

    Science.gov (United States)

    Donner, Sabine; Deutsch, Stefanie; Bleeker, Sebastian; Ripken, Tammo; Krüger, Alexander

    2013-06-01

    Optical coherence tomography (OCT) is a non-invasive imaging technique which can create optical tissue sections, enabling diagnosis of vocal cord tissue. To take full advantage from the non-contact imaging technique, OCT was adapted to an indirect laryngoscope to work on awake patients. Using OCT in a handheld diagnostic device the challenges of rapid working distance adjustment and tracking of axial motion arise. The optical focus of the endoscopic sample arm and the reference-arm length can be adjusted in a range of 40 mm to 90 mm. Automatic working distance adjustment is based on image analysis of OCT B-scans which identifies off depth images as well as position errors. The movable focal plane and reference plane are used to adjust working distance to match the sample depth and stabilise the sample in the desired axial position of the OCT scans. The autofocus adjusts the working distance within maximum 2.7 seconds for the maximum initial displacement of 40 mm. The amplitude of hand tremor during 60 s handheld scanning was reduced to 50 % and it was shown that the image stabilisation keeps the position error below 0.5 mm. Fast automatic working distance adjustment is crucial to minimise the duration of the diagnostic procedure. The image stabilisation compensates relative axial movements during handheld scanning.

  2. Carbonaceous species emitted from handheld two-stroke engines

    Science.gov (United States)

    Volckens, John; Olson, David A.; Hays, Michael D.

    Small, handheld two-stroke engines used for lawn and garden work (e.g., string trimmers, leaf blowers, etc.) can emit a variety of potentially toxic carbonaceous air pollutants. Yet, the emissions effluents from these machines go largely uncharacterized, constraining the proper development of human exposure estimates, emissions inventories, and climate and air quality models. This study samples and evaluates chemical pollutant emissions from the dynamometer testing of six small, handheld spark-ignition engines—model years 1998-2002. Four oil-gas blends were tested in each engine in duplicate. Emissions of carbon dioxide, carbon monoxide, and gas-phase hydrocarbons were predominant, and the PM emitted was organic matter primarily. An ANOVA model determined that engine type and control tier contributed significantly to emissions variations across all identified compound classes; whereas fuel blend was an insignificant variable accounting for engines were generally intermediate in magnitude compared with other gasoline-powered engines, numerous compounds traditionally viewed as motor vehicle markers are also present in small engine emissions in similar relative proportions. Given that small, handheld two-stroke engines used for lawn and garden work account for 5-10% of total US emissions of CO, CO 2, NO x, HC, and PM 2.5, source apportionment models and human exposure studies need to consider the effect of these small engines on ambient concentrations in air polluted environments.

  3. The use of a handheld Raman system for virus detection

    Science.gov (United States)

    Song, Chunyuan; Driskell, Jeremy D.; Tripp, Ralph A.; Cui, Yiping; Zhao, Yiping

    2012-06-01

    The combination of surface enhanced Raman spectroscopy (SERS) with a handheld Raman system would lead to a powerful portable device for defense and security applications. The Thermo Scientific FirstDefender RM instrument is a 785-nm handheld Raman spectrometer intended for rapid field identification of unknown solid and liquid samples. Its sensitivity and effectiveness for SERS-based detection was initially confirmed by evaluating detection of 1,2-di(4- pyridyl)ethylene as a reporter molecule on a silver nanorod (AgNR) substrate, and the results are comparable to those from a confocal Bruker Raman system. As avian influenza A viruses (AIV) are recognized as an important emerging threat to public health, this portable handheld Raman spectrometer is used, for the first time, to detect and identify avian influenza A viruses using a multi-well AgNR SERS chip. The SERS spectra obtained had rich peaks which demonstrated that the instrument can be effectively used for SERS-based influenza virus detection. According to the SERS spectra, these different influenza viruses were distinguished from the negative control via the principal component analysis and by partial least squares-discriminate analysis. Together, these results show that the combination effective SERS substrates when combined with a portable Raman spectrometer provides a powerful field device for chemical and biological sensing.

  4. Absolute reliability of shoulder joint horizontal adductor muscle strength measurements using a handheld dynamometer.

    Science.gov (United States)

    Hirano, Masahiro; Katoh, Munenori

    2015-07-01

    [Purpose] The aim of this study was to verify the absolute reliability of shoulder joint horizontal adductor muscle strength measurements using a handheld dynamometer (HHD). [Subjects and Methods] The subjects were 33 healthy college students. The measurements were made three times with the HHD fixed using a belt (BFHHD) or with the examiner's hand (conventional method; HFHHD). The absolute reliability of measurements was verified using Bland-Altman analysis, both in the all subjects group and a group of subjects showing measurements less than a fixed limit of 30 kgf. [Results] In the adductor muscle strength, single measurements obtained using an HFHHD in the case of a <30 kgf group and the maximum value of two measurements obtained using a BFHHD are reliable. PMID:26311938

  5. Passive Component Network for Antenna Isolation in MIMO Systems for Handheld Terminals

    DEFF Research Database (Denmark)

    Tatomirescu, Alexandru; Pelosi, Mauro; Knudsen, Mikael B.;

    2011-01-01

    This paper presents an improved method to isolate the ports for a MIMO antenna in hand-held devices using lumped components. It has been analyzed through simulation and measurement. The total efficiency and the envelope correlation have been evaluated. Compared to the case with no decoupling...... mechanism, the efficiency from the scattering parameters increases significantly and the envelope correlation coefficient decreases dramatically. Nevertheless, when choosing the components, the ohmic losses must receive extra consideration in order to maximize the system’s total efficiency. Furthermore......, the use of lumped components has the potential to make the presence of other components in the mobile device or the user, less harmful to the decoupling mechanism....

  6. Buried object detection using handheld WEMI with task-driven extended functions of multiple instances

    Science.gov (United States)

    Cook, Matthew; Zare, Alina; Ho, Dominic K. C.

    2016-05-01

    Many effective supervised discriminative dictionary learning methods have been developed in the literature. However, when training these algorithms, precise ground-truth of the training data is required to provide very accurate point-wise labels. Yet, in many applications, accurate labels are not always feasible. This is especially true in the case of buried object detection in which the size of the objects are not consistent. In this paper, a new multiple instance dictionary learning algorithm for detecting buried objects using a handheld WEMI sensor is detailed. The new algorithm, Task Driven Extended Functions of Multiple Instances, can overcome data that does not have very precise point-wise labels and still learn a highly discriminative dictionary. Results are presented and discussed on measured WEMI data.

  7. Ball Lens Fiber Optic Sensor based Smart Handheld Microsurgical Instrument

    Science.gov (United States)

    Song, Cheol; Gehlbach, Peter L.; Kang, Jin U.

    2013-01-01

    During freehand performance of vitreoretinal microsurgery the surgeon must perform precise and stable maneuvers that achieve surgical objectives and avoid surgical risk. Here, we present an improved smart handheld microsurgical tool which is based on a ball lens fiber optic sensor that utilizes common path swept source optical coherence tomography. Improvements include incorporation of a ball lens single mode fiber optic probe that increases the working angle of the tool to greater than 45 degrees; and increases the magnitude of the distance sensing signal through water. Also presented is a cutting function with an improved ergonomic design. PMID:24224076

  8. Performance of new handheld IR camera using uncooled bolometer FPA

    Science.gov (United States)

    Sone, Takanori; Ohkawa, Norio; Kawashima, Yasuo; Matsui, Yasuji; Sugiura, Yosuke; Araki, Tomiharu; Kamozawa, Makoto; Ueno, Masashi; Kaneda, Osamu; Ishikawa, Tomohiro; Hata, Hisatoshi; Hashima, Kazuo; Nakagi, Yoshiyuki; Yamada, Akira; Kimata, Masafumi

    1996-06-01

    A camera using an uncooled infrared image sensor has been developed. This image sensor is a bolometer focal plane array (FPA), of which the readout circuit is designed to minimize the temperature drift or the pattern noise caused by the changes of the ambient temperature. The circuit has a bolometer for the load resistor, which has the same temperature coefficient of resistance as that of the pixel bolometer. Therefore the signal change induced by the temperature change of the FPA substrate is reduced because the resistance change of the load bolometer compensates for that of the pixel bolometer. The effectiveness of the drift- compensating circuit has been confirmed with a prototype handheld camera.

  9. Adaptive RF front-ends for hand-held applications

    CERN Document Server

    van Bezooijen, Andre; van Roermund, Arthur

    2010-01-01

    The RF front-end - antenna combination is a vital part of a mobile phone because its performance is very relevant to the link quality between hand-set and cellular network base-stations. The RF front-end performance suffers from changes in operating environment, like hand-effects, that are often unpredictable. ""Adaptive RF Front-Ends for Hand-Held Applications"" presents an analysis on the impact of fluctuating environmental parameters. In order to overcome undesired behavior two different adaptive control methods are treated that make RF frond-ends more resilient: adaptive impedance control,

  10. Development of Laser-Based Handheld Aerosol Particle Counter

    Institute of Scientific and Technical Information of China (English)

    CHEN Chang; LI Hui

    2005-01-01

    The JC-CA300 handheld Aerosol particle counter is designed and developed based on light scattering principle. The JC-CA300 counter is composed of optical sensor, DSP component and microprocessor unit. The hardware architecture is designed in compact style by SMT IC chips. The whole counter weight is less than 2 pounds. With 32K RAM space, the JC-CA300 can store 500 sampling records and support standard printer and communicate with a computer through RS232 interface. Based on experimental results, the main performance of JC-CA300 is better than that of the ARTI'S HHPC-6 instrument.

  11. Developing a handheld record for patients with cystic fibrosis

    Science.gov (United States)

    Narayan, Omendra; Davies, Siobhan; Tibbins, Carly; Rees, JH Martyn; Lenney, Warren; Gilchrist, Francis J

    2015-01-01

    Patient handheld records (PHHRs) promote self-management and empower the holder to take a more active role in the management of their disease. They have been used successfully in improving preventative care for children and have contributed to improved adherence in a number of chronic illnesses. Despite the potential advantages, there are no standard PHHRs for patients with cystic fibrosis (CF). We report the consultation process that led to the development of a CF PHHR, describe the final document, and analyze the feedback from their use at our center. We have made the CF PHHR freely available online. PMID:26316833

  12. Students Using Handheld Computers to Learn Collaboratively in a First Grade Classroom

    Science.gov (United States)

    Fritz, Megan Lynne

    2005-01-01

    This ethnographic study investigated how first grade students used handheld computers to learn in collaboration with others throughout the learning process. This research focused specifically on how the use of handheld computers impacts students' learning outcomes and relates to technology standards. A qualitative methodology was used to capture…

  13. An Investigation of Game-Embedded Handheld Devices to Enhance English Learning

    Science.gov (United States)

    Hung, Hui-Chun; Young, Shelley Shwu-Ching

    2015-01-01

    This study proposed and implemented a system combining the advantages of both educational games and wireless handheld technology to promote the interactive English learning in the classroom setting. An interactive English vocabulary acquisition board game was designed with the system being implemented on handheld devices. Thirty sixth-grade…

  14. The impact of legislation in Ireland on handheld mobile phone use by drivers.

    LENUS (Irish Health Repository)

    O'Meara, M

    2008-01-01

    Under the Road Traffic Act, 2006 handheld mobile phone use whilst driving is an offence liable to a fine and penalty points. The aim of this study was to determine whether there has been a change in driver behaviour following the introduction of this legislation. This study found that 2.3% of drivers were still using a handheld mobile phone.

  15. My-Mini-Pet: A Handheld Pet-Nurturing Game to Engage Students in Arithmetic Practices

    Science.gov (United States)

    Liao, C. C. Y.; Chen, Z-H.; Cheng, H. N. H.; Chen, F-C.; Chan, T-W.

    2011-01-01

    In the last decade, more and more games have been developed for handheld devices. Furthermore, the popularity of handheld devices and increase of wireless computing can be taken advantage of to provide students with more learning opportunities. Games also could bring promising benefits--specifically, motivating students to learn/play, sustaining…

  16. 75 FR 8400 - In the Matter of Certain Wireless Communications System Server Software, Wireless Handheld...

    Science.gov (United States)

    2010-02-24

    ... COMMISSION In the Matter of Certain Wireless Communications System Server Software, Wireless Handheld Devices... server software, wireless handheld devices and battery packs by reason of infringement of certain claims... may also be obtained by accessing its Internet server at http://www.usitc.gov . The public record...

  17. MR-guided vacuum-assisted breast biopsy with a handheld biopsy system: clinical experience and results in postinterventional MR mammography after 24 h

    International Nuclear Information System (INIS)

    This prospective study evaluates the feasibility of the magnetic resonance (MR)-guided vacuum-assisted breast biopsy with a handheld vacuum-biopsy system and documents the biopsy results with MR mammography 24 h after the procedure. MR-guided biopsy was undertaken in 33 patients with 34 lesions on dynamic MR mammography. The interventions were performed with the handheld 10-gauge Vacora vacuum-biopsy system. In all cases, dynamic MR mammography was performed 24 h after the procedure to determine the extent of the lesion removal and to identify the lesions that were missed. In 5/34 (14.7%) lesions, biopsy was not performed because no suspicious lesion was identified on the day of biopsy. In 25/29 (86.2%) lesions, the biopsy was successfully performed with a complete removal in 4/29 (13.8%) and a partial removal of 21/29 (72.4%) lesions. In 4/29 (13.8%) interventions the lesion was missed with the biopsy. In one case, histopathology after surgical excision revealed ductal carcinoma in situ. Histopathology revealed 9/29 (31%) malignant and 20/29 (68.9%) benign lesions. MR-guided vacuum-assisted breast biopsy with the handheld Vacora vacuum-biopsy system is technically feasible in most cases. MR mammography 24 h after the biopsy should be performed in those cases in which the biopsy success is unclear immediately after the procedure. (orig.)

  18. A Smartphone Controlled Handheld Microfluidic Liquid Handling System

    CERN Document Server

    Li, Baichen; Guan, Allan; Dong, Quan; Ruan, Kangcheng; Hu, Ronggui; Li, Zhenyu

    2014-01-01

    Microfluidics and lab-on-a-chip technologies have made it possible to manipulate small volume liquids with unprecedented resolution, automation and integration. However, most current microfluidic systems still rely on bulky off-chip infrastructures such as compressed pressure sources, syringe pumps and computers to achieve complex liquid manipulation functions. Here, we present a handheld automated microfluidic liquid handling system controlled by a smartphone, which is enabled by combining elastomeric on-chip valves and a compact pneumatic system. As a demonstration, we show that the system can automatically perform all the liquid handling steps of a bead-based sandwich immunoassay on a multi-layer PDMS chip without any human intervention. The footprint of the system is 6 by 10.5 by 16.5cm, and the total weight is 829g including battery. Powered by a 12.8V 1500mAh Li battery, the system consumed 2.2W on average during the immunoassay and lasted for 8.7 hrs. This handheld microfluidic liquid handling platform...

  19. Developing a handheld record for patients with cystic fibrosis

    Directory of Open Access Journals (Sweden)

    Narayan O

    2015-08-01

    Full Text Available Omendra Narayan,1 Siobhan Davies,1 Carly Tibbins,2 JH Martyn Rees,3 Warren Lenney,1,4 Francis J Gilchrist1,4 1Academic Department of Child Health, Royal Stoke University Hospital, Stoke-on-Trent, 2West Midlands Medicines for Children Research Network, Royal Stoke University Hospital, Stoke-on-Trent, 3Department of Paediatrics, Royal Shrewsbury Hospital, Shrewsbury, 4Institute for Science and Technology in Medicine, Keele University, Guy Hilton Research Centre, Stoke-on-Trent, UK Abstract: Patient handheld records (PHHRs promote self-management and empower the holder to take a more active role in the management of their disease. They have been used successfully in improving preventative care for children and have contributed to improved adherence in a number of chronic illnesses. Despite the potential advantages, there are no standard PHHRs for patients with cystic fibrosis (CF. We report the consultation process that led to the development of a CF PHHR, describe the final document, and analyze the feedback from their use at our center. We have made the CF PHHR freely available online.Keywords: cystic fibrosis, pediatrics, patient and public involvement, patient handheld records

  20. Handheld standoff mine detection system (HSTAMIDS) field evaluation in Namibia

    Science.gov (United States)

    Doheny, Robert C.; Burke, Sean; Cresci, Roger; Ngan, Peter; Walls, Richard; Chernoff, Jeff

    2006-05-01

    The Humanitarian Demining Research and Development Program of the US Army RDECOM CERDEC Night Vision and Electronic Sensors Directorate (NVESD), under the direction of the Office of Assistant Secretary of Defense for Special Operations and Low-Intensity Conflict (OASD SO/LIC) and with participation from the International Test and Evaluation Program (ITEP) for humanitarian demining, conducted an in-country field evaluation of the Handheld Standoff Mine Detection System (HSTAMIDS) in the southern African country of Namibia. Participants included the US Humanitarian Demining Team of NVESD; ITEP personnel from several member countries; deminers from two non-governmental organizations in Angola, Menschen Gegen Minen (MgM) and HALO Trust; and CyTerra Corporation. The primary objectives were to demonstrate the performance of the U.S. Army's newest handheld multisensor mine detector, the HSTAMIDS, to the performance of the metal detector being used by local demining organizations and also to assess the performance of deminers using the HSTAMIDS after limited experience and training.

  1. Spectra Transfer Between a Fourier Transform Near-Infrared Laboratory and a Miniaturized Handheld Near-Infrared Spectrometer.

    Science.gov (United States)

    Hoffmann, Uwe; Pfeifer, Frank; Hsuing, Chang; Siesler, Heinz W

    2016-05-01

    The aim of this contribution is to demonstrate the transfer of spectra that have been measured on two different laboratory Fourier transform near-infrared (FT-NIR) spectrometers to the format of a handheld instrument by measuring only a few samples with both spectrometer types. Thus, despite the extreme differences in spectral range and resolution, spectral data sets that have been collected and quantitative as well as qualitative calibrations that have been developed thereof, respectively, over a long period on a laboratory instrument can be conveniently transferred to the handheld system. Thus, the necessity to prepare completely new calibration samples and the effort required to develop calibration models when changing hardware platforms is minimized. The enabling procedure is based on piecewise direct standardization (PDS) and will be described for the data sets of a quantitative and a qualitative application case study. For this purpose the spectra measured on the FT-NIR laboratory spectrometers were used as "master" data and transferred to the "target" format of the handheld instrument. The quantitative test study refers to transmission spectra of three-component liquid solvent mixtures whereas the qualitative application example encompasses diffuse reflection spectra of six different current polymers. To prove the performance of the transfer procedure for quantitative applications, partial least squares (PLS-1) calibrations were developed for the individual components of the solvent mixtures with spectra transferred from the master to the target instrument and the cross-validation parameters were compared with the corresponding parameters obtained for spectra measured on the master and target instruments, respectively. To test the retention of the discrimination ability of the transferred polymer spectra sets principal component analyses (PCAs) were applied exemplarily for three of the six investigated polymers and their identification was demonstrated by

  2. Hand-Held Devices Detect Explosives and Chemical Agents

    Science.gov (United States)

    2010-01-01

    Ion Applications Inc., of West Palm Beach, Florida, partnered with Ames Research Center through Small Business Innovation Research (SBIR) agreements to develop a miniature version ion mobility spectrometer (IMS). While NASA was interested in the instrument for detecting chemicals during exploration of distant planets, moons, and comets, the company has incorporated the technology into a commercial hand-held IMS device for use by the military and other public safety organizations. Capable of detecting and identifying molecules with part-per-billion sensitivity, the technology now provides soldiers with portable explosives and chemical warfare agent detection. The device is also being adapted for detecting drugs and is employed in industrial processes such as semiconductor manufacturing.

  3. Comparative Geometrical Investigations of Hand-Held Scanning Systems

    Science.gov (United States)

    Kersten, T. P.; Przybilla, H.-J.; Lindstaedt, M.; Tschirschwitz, F.; Misgaiski-Hass, M.

    2016-06-01

    An increasing number of hand-held scanning systems by different manufacturers are becoming available on the market. However, their geometrical performance is little-known to many users. Therefore the Laboratory for Photogrammetry & Laser Scanning of the HafenCity University Hamburg has carried out geometrical accuracy tests with the following systems in co-operation with the Bochum University of Applied Sciences (Laboratory for Photogrammetry) as well as the Humboldt University in Berlin (Institute for Computer Science): DOTProduct DPI-7, Artec Spider, Mantis Vision F5 SR, Kinect v1 + v2, Structure Sensor and Google's Project Tango. In the framework of these comparative investigations geometrically stable reference bodies were used. The appropriate reference data were acquired by measurement with two structured light projection systems (AICON smartSCAN and GOM ATOS I 2M). The comprehensive test results of the different test scenarios are presented and critically discussed in this contribution.

  4. Handheld and low-cost digital holographic microscopy

    CERN Document Server

    Shiraki, Atsushi; Shimobaba, Tomoyoshi; Masuda, Nobuyuki; Ito, Tomoyoshi

    2012-01-01

    This study developed handheld and low-cost digital holographic microscopy (DHM) by adopting an in-line type hologram, a webcam, a high power RGB light emitting diode (LED), and a pinhole. It cost less than 20,000 yen (approximately 250 US dollars at 80 yen/dollar), and was approximately 120 mm x 80 mm x 55 mm in size. In addition, by adjusting the recording-distance of a hologram, the lateral resolution power at the most suitable distance was 17.5 um. Furthermore, this DHM was developed for use in open source libraries, and is therefore low-cost and can be easily developed by anyone. In this research, it is the feature to cut down cost and size and to improve the lateral resolution power further rather than existing reports. This DHM will be a useful application in fieldwork, education, and so forth.

  5. Design and Analysis of 6 DOF Handheld Micromanipulator.

    Science.gov (United States)

    Yang, Sungwook; Maclachlan, Robert A; Riviere, Cameron N

    2012-12-31

    This paper presents the design and analysis of a handheld manipulator for vitreoretinal microsurgery and other biomedical applications. The design involves a parallel micromanipulator utilizing six piezoelectric linear actuators, combining compactness with a large range of motion and relatively high stiffness. Given the available force of the actuators, the overall dimension of the micromanipulator was optimized considering realistic external loads on a remote center of motion representing the point of expected contact with the sclera of the eye during microsurgery. Based on optimization and workspace analysis, a benchtop version of the micromanipulator was built with a base diameter of 25 mm and a height of 50 mm. It provides a hemispherical workspace of 4.0 mm diameter at the tool tip. The manipulation performance of the constructed manipulator was measured under a lateral load applied at the remote center of motion. The micromanipulator tolerated side loads up to 200 mN. PMID:24649394

  6. Watermark in the Digital Video Broadcasting Handheld Transmission Signal

    Institute of Scientific and Technical Information of China (English)

    HU Ling-na; JIANG Ling-ge; HE Chen; YANG Feng

    2009-01-01

    Transmitter identification (TxID) technique is used to diagnose the operation status of radio trans-mitters in DTV distributed transmission network. A new TxID method for digital video broadcasting-handheld (DVB-H) system is proposed. Watermark is embedded in the DVB-H signal to form the composite signal. Ac-cording to watermarking theory we demonstrate the required signal level for watermarking signal to achieve given bit error Probability under different circumstance. By selecting the reference pattern to generate watermarking signal, peak-to-average power ratio (PAPR) of the transmitted signal can be improved. Simulation results show that even in wireless situation the receiver can distinguish the watermarking signal with low embedding strength, and distortion to the host signal can also be ignored.

  7. A handheld real time thermal cycler for bacterial pathogen detection.

    Science.gov (United States)

    Higgins, James A; Nasarabadi, Shanavaz; Karns, Jeffrey S; Shelton, Daniel R; Cooper, Mary; Gbakima, Aiah; Koopman, Ronald P

    2003-08-15

    The handheld advanced nucleic acid analyzer (HANAA) is a portable real time thermal cycler unit that weighs under 1 kg and uses silicon and platinum-based thermalcycler units to conduct rapid heating and cooling of plastic reaction tubes. Two light emitting diodes (LED) provide greater than 1 mW of electrical power at wavelengths of 490 nm (blue) and 525 nm (green), allowing detection of the dyes FAM and JOE/TAMRA. Results are displayed in real time as bar graphs, and up to three, 4-sample assays can be run on the charge of the 12 V portable battery pack. The HANAA was evaluated for detection of defined Escherichia coli strains, and wild-type colonies isolated from stream water, using PCR for the lac Z and Tir genes. PCR reactions using SYBR Green dye allowed detection of E. coli ATCC 11775 and E. coli O157:H7 cells in under 30 min of assay time; however, background fluorescence associated with dye binding to nonspecific PCR products was present. DNA extracted from three isolates of Bacillus anthracis Ames, linked to a bioterrorism incident in Washington DC in October 2001, were also successfully tested on the HANAA using primers for the vrrA and capA genes. Positive results were observed at 32 and 22 min of assay time, respectively. A TaqMan probe specific to the aroQ gene of Erwinia herbicola was tested on the HANAA and when 500 cells were used as template, positive results were observed after only 7 min of assay time. Background fluorescence associated with the use of the probe was negligible. The HANAA is unique in offering real time PCR in a handheld format suitable for field use; a commercial version of the instrument, offering six reaction chambers, is available as of Fall 2002. PMID:12788554

  8. Analysis of accuracy in pointing with redundant hand-held tools: a geometric approach to the uncontrolled manifold method.

    Science.gov (United States)

    Campolo, Domenico; Widjaja, Ferdinan; Xu, Hong; Ang, Wei Tech; Burdet, Etienne

    2013-04-01

    This work introduces a coordinate-independent method to analyse movement variability of tasks performed with hand-held tools, such as a pen or a surgical scalpel. We extend the classical uncontrolled manifold (UCM) approach by exploiting the geometry of rigid body motions, used to describe tool configurations. In particular, we analyse variability during a static pointing task with a hand-held tool, where subjects are asked to keep the tool tip in steady contact with another object. In this case the tool is redundant with respect to the task, as subjects control position/orientation of the tool, i.e. 6 degrees-of-freedom (dof), to maintain the tool tip position (3dof) steady. To test the new method, subjects performed a pointing task with and without arm support. The additional dof introduced in the unsupported condition, injecting more variability into the system, represented a resource to minimise variability in the task space via coordinated motion. The results show that all of the seven subjects channeled more variability along directions not directly affecting the task (UCM), consistent with previous literature but now shown in a coordinate-independent way. Variability in the unsupported condition was only slightly larger at the endpoint but much larger in the UCM.

  9. Implementation of the 7-point checklist for melanoma detection on smart handheld devices.

    Science.gov (United States)

    Wadhawan, Tarun; Situ, Ning; Rui, Hu; Lancaster, Keith; Yuan, Xiaojing; Zouridakis, George

    2011-01-01

    In this paper we implement the 7-point checklist, a set of dermoscopic criteria widely used by clinicians for melanoma detection, on smart handheld devices, such as the Apple iPhone and iPad. The application developed is using sophisticated image processing and pattern recognition algorithms, yet it is light enough to run on a handheld device with limited memory and computational speed. When combined with a commercially available handheld dermoscope that provides proper lesion illumination, this application provides a truly self-contained handheld system for melanoma detection. Such a device can be used in a clinical setting for routine skin screening, or as an assistive diagnostic device in underserved areas and in developing countries with limited healthcare infrastructure. PMID:22255015

  10. Reusable Handheld Electrolytes and Lab Technology for Humans (rHEALTH Sensor) Project

    Data.gov (United States)

    National Aeronautics and Space Administration — The goal of the rHEALTH sensor is to provide rapid, low-cost, handheld complete blood count (CBC), cell differential counts, electrolyte measurements, and other lab...

  11. Handheld Longwave Infrared Camera Based on Highly-Sensitive Quantum Well Infrared Photodetectors Project

    Data.gov (United States)

    National Aeronautics and Space Administration — We propose to develop a compact handheld longwave infrared camera based on quantum well infrared photodetector (QWIP) focal plane array (FPA) technology. Based on...

  12. Handheld Nonlinear Detection of Delamination and Intrusion Faults in Composites Project

    Data.gov (United States)

    National Aeronautics and Space Administration — In Phase I of the SBIR program, LEEOAT Company will develop a hand-held high-resolution ultrasonic nonlinear imager for non-destructive inspection (NDI) of...

  13. Hand-held based near-infrared optical imaging devices: a review.

    Science.gov (United States)

    Erickson, Sarah J; Godavarty, Anuradha

    2009-06-01

    Near-infrared (NIR) optical imaging is a non-invasive and non-ionizing modality that is emerging as a diagnostic/prognostic tool for breast cancer and other applications related to functional brain mapping. In recent years, hand-held based optical imaging devices are developed for clinical translation of the technology, as opposed to the various bulky optical imagers available. Herein, we review the different hand-held based NIR devices developed to date, in terms of the measurement techniques implemented (continuous wave, time or frequency-domain), the imaging methods used, and the specific applications towards which they were applied. The advantages and disadvantages of the different hand-held optical devices are described and also compared with respect to a novel hand-held based device currently developed in our Optical Imaging Laboratory towards three-dimensional tomography studies. PMID:19054704

  14. Reusable Handheld Electrolytes and Lab Technology for Humans (rHEALTH Sensor) Project

    Data.gov (United States)

    National Aeronautics and Space Administration — The goal of rHEALTH sensor is a universal handheld sensor that can provide rapid, low-cost complete blood count (CBC) with differential, electrolyte analysis, and...

  15. 75 FR 448 - In the Matter of: Certain Authentication Systems, Including Software and Handheld Electronic...

    Science.gov (United States)

    2010-01-05

    ... From the Federal Register Online via the Government Publishing Office INTERNATIONAL TRADE COMMISSION In the Matter of: Certain Authentication Systems, Including Software and Handheld Electronic Devices; Notice of Investigation AGENCY: U.S. International Trade Commission. ACTION: Institution...

  16. 75 FR 10502 - In the Matter of Certain Electronic Devices, Including Handheld Wireless Communications Devices...

    Science.gov (United States)

    2010-03-08

    ... From the Federal Register Online via the Government Publishing Office INTERNATIONAL TRADE COMMISSION In the Matter of Certain Electronic Devices, Including Handheld Wireless Communications Devices... in Their Entirety AGENCY: U.S. International Trade Commission. ACTION: Notice. SUMMARY: Notice...

  17. 76 FR 22918 - In the Matter of Certain Handheld Electronic Computing Devices, Related Software, and Components...

    Science.gov (United States)

    2011-04-25

    ... From the Federal Register Online via the Government Publishing Office ] INTERNATIONAL TRADE COMMISSION In the Matter of Certain Handheld Electronic Computing Devices, Related Software, and Components Thereof; Notice of Investigation AGENCY: U.S. International Trade Commission. ACTION: Notice....

  18. Application of Handheld Tele-ECG for Health Care Delivery in Rural India

    OpenAIRE

    Meenu Singh; Amit Agarwal; Vineet Sinha; Rohit Manoj Kumar; Nishant Jaiswal; Ishita Jindal; Pankaj Pant; Munish Kumar

    2014-01-01

    Telemonitoring is a medical practice that involves remotely monitoring patients who are not at the same location as the health care provider. The purpose of our study was to use handheld tele-electrocardiogram (ECG) developed by Bhabha Atomic Research Center (BARC) to identify heart conditions in the rural underserved population where the doctor-patient ratio is low and access to health care is difficult. The objective of our study was clinical validation of handheld tele-ECG as a screening t...

  19. Handheld scanning probes for optical coherence tomography: developments, applications, and perspectives

    Science.gov (United States)

    Duma, V.-F.; Demian, D.; Sinescu, C.; Cernat, R.; Dobre, G.; Negrutiu, M. L.; Topala, F. I.; Hutiu, Gh.; Bradu, A.; Podoleanu, A. G.

    2016-03-01

    We present the handheld scanning probes that we have recently developed in our current project for biomedical imaging in general and for Optical Coherence Tomography (OCT) in particular. OCT is an established, but dynamic imagistic technique based on laser interferometry, which offers micrometer resolutions and millimeters penetration depths. With regard to existing devices, the newly developed handheld probes are simple, light and relatively low cost. Their design is described in detail to allow for the reproduction in any lab, including for educational purposes. Two probes are constructed almost entirely from off-the-shelf components, while a third, final variant is constructed with dedicated components, in an ergonomic design. The handheld probes have uni-dimensional (1D) galvanometer scanners therefore they achieve transversal sections through the biological sample investigated - in contrast to handheld probes equipped with bi-dimensional (2D) scanners that can also achieve volumetric (3D) reconstructions of the samples. These latter handheld probes are therefore also discussed, as well as the possibility to equip them with galvanometer 2D scanners or with Risley prisms. For galvanometer scanners the optimal scanning functions studied in a series of previous works are pointed out; these functions offer a higher temporal efficiency/duty cycle of the scanning process, as well as artifact-free OCT images. The testing of the handheld scanning probes in dental applications is presented, for metal ceramic prosthesis and for teeth.

  20. Cordless hand-held optical 3D sensor

    Science.gov (United States)

    Munkelt, Christoph; Bräuer-Burchardt, Christian; Kühmstedt, Peter; Schmidt, Ingo; Notni, Gunther

    2007-07-01

    A new mobile optical 3D measurement system using phase correlation based fringe projection technique will be presented. The sensor consist of a digital projection unit and two cameras in a stereo arrangement, whereby both are battery powered. The data transfer to a base station will be done via WLAN. This gives the possibility to use the system in complicate, remote measurement situations, which are typical in archaeology and architecture. In the measurement procedure the sensor will be hand-held by the user, illuminating the object with a sequence of less than 10 fringe patterns, within a time below 200 ms. This short sequence duration was achieved by a new approach, which combines the epipolar constraint with robust phase correlation utilizing a pre-calibrated sensor head, containing two cameras and a digital fringe projector. Furthermore, the system can be utilized to acquire the all around shape of objects by using the phasogrammetric approach with virtual land marks introduced by the authors 1, 2. This way no matching procedures or markers are necessary for the registration of multiple views, which makes the system very flexible in accomplishing different measurement tasks. The realized measurement field is approx. 100 mm up to 400 mm in diameter. The mobile character makes the measurement system useful for a wide range of applications in arts, architecture, archaeology and criminology, which will be shown in the paper.

  1. NUVU: handheld instruments for video inspection of aircraft wiring

    Science.gov (United States)

    Pike, John N.; Mehrotra, Yogesh; Kaplan, Herbert

    1999-01-01

    Most of the current practices of manual visual inspection of aircraft wiring bundles can be replaced or assisted by a portable test system consisting of a miniature B/W or color TV camera and controllable uniform illumination mounted in a flashlight-sized, hand-held unit weighing less than one pound. The location and configuration of the battery power supply and image viewing and storage means are at the discretion of the inspector. A typical viewed area is nominally 1 inch by 1.3 inches, with a depth of field up to 1.5 inches. Tradeoffs among pixel dimensions, geometrical optics, and lens diffraction which arise in the design of such a unit are discussed. Data are presented showing actuator measured depths of field and image resolutions vs. variable camera lens aperture under real conditions. The image size in these tests provided an overall 12X enlargement of the target, as viewed by the inspector in real time. On insulated wires as small as 1mm OD, printed markings are easily seen and read, as are common chafes, radial surface cracks, and other surface anomalies of the insulation. The present mechanical design permits the small unit not only to inspect areas in any direction to which the hand and wrist can point, but also allows insertion of the unit in areas not easily accessible to the hand or eye.

  2. Automated working distance adjustment for a handheld OCT-Laryngoscope

    Science.gov (United States)

    Donner, Sabine; Bleeker, Sebastian; Ripken, Tammo; Krueger, Alexander

    2014-03-01

    Optical coherence tomography (OCT) is an imaging technique which enables diagnosis of vocal cord tissue structure by non-contact optical biopsies rather than invasive tissue biopsies. For diagnosis on awake patients OCT was adapted to a rigid indirect laryngoscope. The working distance must match the probe-sample distance, which varies from patient to patient. Therefore the endoscopic OCT sample arm has a variable working distance of 40 mm to 80 mm. The current axial position is identified by automated working distance adjustments based on image processing. The OCT reference plane and the focal plane of the sample arm are moved according to position errors. Repeated position adjustment during the whole diagnostic procedure keeps the tissue sample at the optimal axial position. The auto focus identifies and adjusts the working distance within the range of 50 mm within a maximum time of 2.7 s. Continuous image stabilisation reduces axial sample movement within the sampling depth for handheld OCT scanning. Rapid autofocus reduces the duration of the diagnostic procedure and axial position stabilisation eases the use of the OCT laryngoscope. Therefore this work is an important step towards the integration of OCT into indirect laryngoscopes.

  3. Portable multiwavelength laser diode source for handheld photoacoustic devices

    Science.gov (United States)

    Canal, Celine; Laugustin, Arnaud; Kohl, Andreas; Rabot, Olivier

    2016-04-01

    The ageing population faces today an increase of chronic diseases such as rheumatism/arthritis, cancer and cardio vascular diseases for which appropriate treatments based on a diagnosis at an early-stage of the disease are required. Some imaging techniques are already available in order to get structural information. Within the non-invasive group, ultrasound images are common in these fields of medicine. However, there is a need for a point-of-care device for imaging smaller structures such as blood vessels that cannot be observed with purely ultrasound based devices. Photoacoustics proved to be an attractive candidate. This novel imaging technique combines pulsed laser light for excitation of tissues and an ultrasound transducer as a receptor. Introduction of this technique into the clinic requires to drastically shrink the size and cost of the expensive and bulky nanosecond lasers generally used for light emission. In that context, demonstration of ultra-short pulse emission with highly efficient laser diodes in the near-infrared range has been performed by Quantel, France. A multi-wavelength laser source as small as a hand emitted more than 1 mJ per wavelength with four different wavelengths available in pulses of about 90 ns. Such a laser source can be integrated into high sensitivity photoacoustic handheld systems due to their outstanding electrical-to-optical efficiency of about 25 %. Further work continues to decrease the pulse length as low as 40 ns while increasing the pulse energy to 2 mJ.

  4. Pulsed photoacoustic flow imaging with a handheld system.

    Science.gov (United States)

    van den Berg, Pim J; Daoudi, Khalid; Steenbergen, Wiendelt

    2016-02-01

    Flow imaging is an important technique in a range of disease areas, but estimating low flow speeds, especially near the walls of blood vessels, remains challenging. Pulsed photoacoustic flow imaging can be an alternative since there is little signal contamination from background tissue with photoacoustic imaging. We propose flow imaging using a clinical photoacoustic system that is both handheld and portable. The system integrates a linear array with 7.5 MHz central frequency in combination with a high-repetition-rate diode laser to allow high-speed photoacoustic imaging--ideal for this application. This work shows the flow imaging performance of the system in vitro using microparticles. Both two-dimensional (2-D) flow images and quantitative flow velocities from 12 to 75  mm/s were obtained. In a transparent bulk medium, flow estimation showed standard errors of ∼7% the estimated speed; in the presence of tissue-realistic optical scattering, the error increased to 40% due to limited signal-to-noise ratio. In the future, photoacoustic flow imaging can potentially be performed in vivo using fluorophore-filled vesicles or with an improved setup on whole blood.

  5. Military forensic use of handheld 3D camera

    Science.gov (United States)

    Larsson, Hâkan; Letalick, Dietmar

    2013-05-01

    One of the main threats for armed forces in conflict areas are attacks by improvised explosive devices (IED). After an IED attack a forensic investigation of the site is undertaken. In many ways military forensic work is similar to the civilian counterpart. There are the same needs to acquire evidence in the crime scene, such as fingerprints, DNA, and samples of the remains of the IED. Photos have to be taken and the geometry of the location shall be measured, preferably in 3D. A main difference between the military and the civilian forensic work is the time slot available for the scene investigation. The military must work under the threat of fire assault, e.g. snipers. The short time slot puts great demands on the forensic team and the equipment they use. We have done performance measurements of the Mantis-Vision F5 sensor and evaluated the usefulness in military forensic applications. This paper will describe some applications and show possibilities and also limitations of using a handheld laser imaging sensor for military forensic investigations.

  6. Temperature and Structure of Active Eruptions from a Handheld Camcorder

    Science.gov (United States)

    Radebaugh, Jani; Carling, Greg T.; Saito, Takeshi; Dangerfield, Anne; Tingey, David G.; Lorenz, Ralph D.; Lopes, Rosaly M.; Howell, Robert R.; Diniega, Serina; Turtle, Elizabeth P.

    2014-11-01

    A commercial handheld digital camcorder can operate as a high-resolution, short-wavelength, low-cost thermal imaging system for monitoring active volcanoes, when calibrated against a laboratory heated rock of similar composition to the given eruptive material. We utilize this system to find full pixel brightness temperatures on centimeter scales at close but safe proximity to active lava flows. With it, observed temperatures of a Kilauea tube flow exposed in a skylight reached 1200 C, compared with pyrometer measurements of the same flow of 1165 C, both similar to reported eruption temperatures at that volcano. The lava lake at Erta Ale, Ethiopia had crack and fountain temperatures of 1175 C compared with previous pyrometer measurements of 1165 C. Temperature calibration of the vigorously active Marum lava lake in Vanuatu is underway, challenges being excessive levels of gas and distance from the eruption (300 m). Other aspects of the fine-scale structure of the eruptions are visible in the high-resolution temperature maps, such as flow banding within tubes, the thermal gradient away from cracks in lake surfaces, heat pathways through pahoehoe crust and temperature zoning in spatter and fountains. High-resolution measurements such as these reveal details of temperature, structure, and change over time at the rapidly evolving settings of active lava flows. These measurement capabilities are desirable for future instruments exploring bodies with active eruptions like Io, Enceladus and possibly Venus.

  7. Handheld Flyback driven coaxial dielectric barrier discharge: Development and characterization.

    Science.gov (United States)

    Law, V J; Milosavljević, V; O'Connor, N; Lalor, J F; Daniels, S

    2008-09-01

    The development of a handheld single and triple chamber atmospheric pressure coaxial dielectric barrier discharge driven by Flyback circuitry for helium and argon discharges is described. The Flyback uses external metal-oxide-semiconductor field-effect transistor power switching technology and the transformer operates in the continuous current mode to convert a continuous dc power of 10-33 W to generate a 1.2-1.6 kV 3.5 micros pulse. An argon discharge breakdown voltage of approximately 768 V is measured. With a 50 kHz, pulse repetition rate and an argon flow rate of 0.5-10 argon slm (slm denotes standard liters per minute), the electrical power density deposited in the volume discharge increases linearly at a rate of 75+/-20% mW/cm(3) per 1 slm of gas. Electrical power transfer efficiency between the secondary Flyback coil and the discharge volume increases from 0.1% to 0.65%. Neutral argon gas forced convection analysis yields a similar energy loss rate to the electrical discharge process. Optical emission spectroscopy studies of the expanding discharge plume into ambient air reveal that the air climatically controls the plume chemistry to produce an abundance of neutral argon atoms and molecular nitrogen. PMID:19044446

  8. Handheld Raman Spectroscopy for the Distinction of Essential Oils Used in the Cosmetics Industry

    Directory of Open Access Journals (Sweden)

    Paul Vargas Jentzsch

    2015-05-01

    Full Text Available Essential oils are highly appreciated by the cosmetics industry because they have antimicrobial and antioxidant properties, among others. Since essential oils are natural products, their inclusion in cosmetic formulations is a common practice. Currently, low-quality and/or adulterated essential oils can be found on the market; therefore, analytical methods for control are required. Raman spectroscopy is a versatile technique that can be used for quality control tasks; the portability of modern devices expand the analytical possibilities also to in situ measurements. Fifteen essential oils of interest for the cosmetics industry were measured using a handheld Raman spectrometer, and the assignment of the main bands observed in their average spectra was proposed. In most cases, it is possible to distinguish the essential oils by a simple visual inspection of their characteristic Raman bands. However, for essential oils extracted from closely-related vegetable species and containing the same main component in a very high proportion, the visual inspection of the spectra may be not enough, and the application of chemometric methods is suggested. Characteristic Raman bands for each essential oil can be used to both identify the essential oils and detect adulterations.

  9. Reliability and Accuracy of Six Hand-Held Blood Lactate Analysers

    Directory of Open Access Journals (Sweden)

    Jacinta M. Bonaventura, Ken Sharpe, Emma Knight, Kate L. Fuller, Rebecca K. Tanner, Christopher J. Gore

    2015-03-01

    Full Text Available The reliability and accuracy of five portable blood lactate (BLa analysers (Lactate Pro, Lactate Pro2, Lactate Scout+, Xpress™, and Edge and one handheld point-of-care analyser (i-STAT were compared to a criterion (Radiometer ABL90. Two devices of each brand of analyser were assessed using 22 x 6 mL blood samples taken from five subjects at rest and during exercise who generated lactate ranging ~1-23 mM. Each sample was measured simultaneously ~6 times on each device. Reliability was assessed as the within-sample standard deviation (wsSD of the six replicates; accuracy as the bias compared with the ABL90; and overall error (the root mean squared error (√MSE was calculated as the square root of (wsSD2 and bias2. The √MSE indicated that both the Edge and Xpress had low total error (~0-2 mM for lactate concentrations 15 mM. In all cases, bias (negative was the major contribution to the √MSE. In conclusion, in a clinical setting where BLa is generally <15 mM the Edge and Xpress devices are relevant, but for athlete testing where peak BLa is important for training prescription the Edge and Lactate Pro2 are preferred.

  10. Portable Hand-Held Electrochemical Sensor for the Transuranics

    Energy Technology Data Exchange (ETDEWEB)

    Dale D. Russell, William B. Knowlton, Ph.D.; Russel Hertzog, Ph.D

    2005-11-25

    sensitive detector for uranium. Millimeter scale electrodes, operated by a hand-held instrument assembled in this lab and operated in the voltammetric mode, were transported to the DOE-Nevada test site (Las Vegas, NV) where field detection and quantitation of plutonium, uranium, and a mixture of these two elements was also demonstrated. Several probe designs were prepared, built and tested including probes with movable protective windows. A miniature, battery powered potentiostat was designed, built and demonstrated for use in a hand-held field portable instrument. This work was performed largely by undergraduates who gained valuable research experience, and many of them have continued on to graduate schools. In addition, they all gained exposure to and appreciation for national security research, in particular non-proliferation research. Four graduate students participated and one earned the MS degree on this project.

  11. A handheld point-of-care genomic diagnostic system.

    Directory of Open Access Journals (Sweden)

    Frank B Myers

    Full Text Available The rapid detection and identification of infectious disease pathogens is a critical need for healthcare in both developed and developing countries. As we gain more insight into the genomic basis of pathogen infectivity and drug resistance, point-of-care nucleic acid testing will likely become an important tool for global health. In this paper, we present an inexpensive, handheld, battery-powered instrument designed to enable pathogen genotyping in the developing world. Our Microfluidic Biomolecular Amplification Reader (µBAR represents the convergence of molecular biology, microfluidics, optics, and electronics technology. The µBAR is capable of carrying out isothermal nucleic acid amplification assays with real-time fluorescence readout at a fraction of the cost of conventional benchtop thermocyclers. Additionally, the µBAR features cell phone data connectivity and GPS sample geotagging which can enable epidemiological surveying and remote healthcare delivery. The µBAR controls assay temperature through an integrated resistive heater and monitors real-time fluorescence signals from 60 individual reaction chambers using LEDs and phototransistors. Assays are carried out on PDMS disposable microfluidic cartridges which require no external power for sample loading. We characterize the fluorescence detection limits, heater uniformity, and battery life of the instrument. As a proof-of-principle, we demonstrate the detection of the HIV-1 integrase gene with the µBAR using the Loop-Mediated Isothermal Amplification (LAMP assay. Although we focus on the detection of purified DNA here, LAMP has previously been demonstrated with a range of clinical samples, and our eventual goal is to develop a microfluidic device which includes on-chip sample preparation from raw samples. The µBAR is based entirely around open source hardware and software, and in the accompanying online supplement we present a full set of schematics, bill of materials, PCB layouts

  12. Accuracy of handheld blood glucose meters at high altitude.

    Directory of Open Access Journals (Sweden)

    Pieter de Mol

    Full Text Available BACKGROUND: Due to increasing numbers of people with diabetes taking part in extreme sports (e.g., high-altitude trekking, reliable handheld blood glucose meters (BGMs are necessary. Accurate blood glucose measurement under extreme conditions is paramount for safe recreation at altitude. Prior studies reported bias in blood glucose measurements using different BGMs at high altitude. We hypothesized that glucose-oxidase based BGMs are more influenced by the lower atmospheric oxygen pressure at altitude than glucose dehydrogenase based BGMs. METHODOLOGY/PRINCIPAL FINDINGS: Glucose measurements at simulated altitude of nine BGMs (six glucose dehydrogenase and three glucose oxidase BGMs were compared to glucose measurement on a similar BGM at sea level and to a laboratory glucose reference method. Venous blood samples of four different glucose levels were used. Moreover, two glucose oxidase and two glucose dehydrogenase based BGMs were evaluated at different altitudes on Mount Kilimanjaro. Accuracy criteria were set at a bias 6.5 mmol/L and <1 mmol/L from reference glucose (when <6.5 mmol/L. No significant difference was observed between measurements at simulated altitude and sea level for either glucose oxidase based BGMs or glucose dehydrogenase based BGMs as a group phenomenon. Two GDH based BGMs did not meet set performance criteria. Most BGMs are generally overestimating true glucose concentration at high altitude. CONCLUSION: At simulated high altitude all tested BGMs, including glucose oxidase based BGMs, did not show influence of low atmospheric oxygen pressure. All BGMs, except for two GDH based BGMs, performed within predefined criteria. At true high altitude one GDH based BGM had best precision and accuracy.

  13. Consumer product safety: Risk assessment of exposure to asbestos emissions from hand-held hair dryers

    Science.gov (United States)

    Hallenbeck, William H.

    1981-01-01

    The United States Consumer Product Safety Commission (CPSC) is concerned that consumer exposure to asbestos from consumer products may present an unreasonable risk of injury. Recently, CPSC has obtained agreement by industry to cease production and distribution of hair dryers containing asbestos heat insulation. CPSC intends to broaden its investigation by selecting consumer products containing asbestos for “priority attention.” The Commission does not intend to make quantitative estimates of cancer risks posed by exposure to asbestos fibers in making regulatory decisions. This position may lead to a serious waste of resources for the Commission, industry, and society. The Commission should focus its initial attention on those products for which the release of asbestos is significant enough to cause an unreasonable health risk. To make a risk assessment for a particular use of asbestos, CPSC must acquire or request data on asbestos emissions and define “unreasonable risk to health.” In an attempt to give some meaning to the phrase “risk assessment,” the primary goal of this paper is to present a detailed risk assessment of exposure to asbestos from hand-held hair dryers. Several scenarios of use are presented using various assumptions regarding time of operation, mixing of fibers in a small room, rate of fiber emission, and time of exposure. The worst case analysis of the health risk of exposure to hair dryer emissions is based on several conservative assumptions and shows that the increased number of deaths per year due to respiratory cancer is 4 for the entire United States population. A more representative case analysis shows the increased number of deaths to be on the order of 0.15 per year.

  14. 78 FR 20695 - Walk-Through Metal Detectors and Hand-Held Metal Detectors Test Method Validation

    Science.gov (United States)

    2013-04-05

    ... Office of Justice Programs Walk-Through Metal Detectors and Hand-Held Metal Detectors Test Method... detectors and hand-held metal detectors. In order to ensure that the test methods in the standards are properly documented, NIJ is requesting proposals (including price quotes) for test method...

  15. Design of an Optical Character Recognition System for Camera-based Handheld Devices

    CERN Document Server

    Mollah, Ayatullah Faruk; Basu, Subhadip; Nasipuri, Mita

    2011-01-01

    This paper presents a complete Optical Character Recognition (OCR) system for camera captured image/graphics embedded textual documents for handheld devices. At first, text regions are extracted and skew corrected. Then, these regions are binarized and segmented into lines and characters. Characters are passed into the recognition module. Experimenting with a set of 100 business card images, captured by cell phone camera, we have achieved a maximum recognition accuracy of 92.74%. Compared to Tesseract, an open source desktop-based powerful OCR engine, present recognition accuracy is worth contributing. Moreover, the developed technique is computationally efficient and consumes low memory so as to be applicable on handheld devices.

  16. Early Childhood Vision Screening in Hawai‘i Utilizing a Hand-Held Screener

    OpenAIRE

    Chang, Duane A; Ede, Roger C; Dominic C. Chow; Souza, Ryan D; Gangcuangco, Louie Mar A.; Hanks, Nancy; Nakamoto, Beau K.; Mitchell, Brooks; Masutani, Alison T; Fisk, Sam; Shikuma, Cecilia M.; Dill, Jan E

    2015-01-01

    The goal of early childhood vision screening is to detect subnormal vision and amblyopic risk factors that threaten visual development so that treatment can be initiated early to yield the highest benefit. Hand-held, portable, instrument-based vision screening devices can be used in children as young as 6 months of age. We assessed the feasibility of hand-held photoscreeners to screen for vision disorders in pre-school children in Hawai‘i. A total of 137 preschool children on O‘ahu in the “Tu...

  17. Automatic detection of a hand-held needle in ultrasound via phased-based analysis of the tremor motion

    Science.gov (United States)

    Beigi, Parmida; Salcudean, Septimiu E.; Rohling, Robert; Ng, Gary C.

    2016-03-01

    This paper presents an automatic localization method for a standard hand-held needle in ultrasound based on temporal motion analysis of spatially decomposed data. Subtle displacement arising from tremor motion has a periodic pattern which is usually imperceptible in the intensity image but may convey information in the phase image. Our method aims to detect such periodic motion of a hand-held needle and distinguish it from intrinsic tissue motion, using a technique inspired by video magnification. Complex steerable pyramids allow specific design of the wavelets' orientations according to the insertion angle as well as the measurement of the local phase. We therefore use steerable pairs of even and odd Gabor wavelets to decompose the ultrasound B-mode sequence into various spatial frequency bands. Variations of the local phase measurements in the spatially decomposed input data is then temporally analyzed using a finite impulse response bandpass filter to detect regions with a tremor motion pattern. Results obtained from different pyramid levels are then combined and thresholded to generate the binary mask input for the Hough transform, which determines an estimate of the direction angle and discards some of the outliers. Polynomial fitting is used at the final stage to remove any remaining outliers and improve the trajectory detection. The detected needle is finally added back to the input sequence as an overlay of a cloud of points. We demonstrate the efficiency of our approach to detect the needle using subtle tremor motion in an agar phantom and in-vivo porcine cases where intrinsic motion is also present. The localization accuracy was calculated by comparing to expert manual segmentation, and presented in (mean, standard deviation and root-mean-square error) of (0.93°, 1.26° and 0.87°) and (1.53 mm, 1.02 mm and 1.82 mm) for the trajectory and the tip, respectively.

  18. A Framework for Trusted Handheld Terminal Emulation%一种可信移动终端仿真架构

    Institute of Scientific and Technical Information of China (English)

    乔峰

    2015-01-01

    The evolution of mobile computing has led to the emergence of smart devices that is used in almost constant personal and business use, for example, accessing to email, social media, application stores, financial institutions, and other uses. Security has become a first order design consideration for handheld terminal and wireless communication systems. Researchers need to incorporate trusted computing mechanisms to secure and support these and other mobile use cases. Such security mechanisms include techniques to ensure device integrity, attestation, isolation and protected storage. The security issues of IT products are more important. This paper presents a framework for simulation trusted handheld terminal (THT) on the performance of applications in multi-core platform.%随着移动计算的不断发展,移动智能设备在个人和企业工作中得到了广泛应用.例如访问电子邮件、社交媒体、应用商店、金融机构以及其他用途.信息安全成为手持移动终端和无线通信系统设计首要考虑的问题.研究人员需要将可信计算的安全机制部署到这些移动应用中.可信安全机制包括:确保设备的完整性、认证、隔离和保护.在IT产品设计中信息安全问题已成为重要的问题.本文提出了一个框架,在多核计算机平台上模拟可信手持移动终端(THT)并对其进行性能分析.

  19. 一种可信移动终端仿真架构%A Framework for Trusted Handheld Terminal Emulation

    Institute of Scientific and Technical Information of China (English)

    乔峰

    2015-01-01

    The evolution of mobile computing has led to the emergence of smart devices that is used in almost constant personal and business use, for example, accessing to email, social media, application stores, financial institutions, and other uses. Security has become a first order design consideration for handheld terminal and wireless communication systems. Researchers need to incorporate trusted computing mechanisms to secure and support these and other mobile use cases. Such security mechanisms include techniques to ensure device integrity, attestation, isolation and protected storage. The security issues of IT products are more important. This paper presents a framework for simulation trusted handheld terminal (THT) on the performance of applications in multi-core platform.%随着移动计算的不断发展,移动智能设备在个人和企业工作中得到了广泛应用.例如访问电子邮件、社交媒体、应用商店、金融机构以及其他用途.信息安全成为手持移动终端和无线通信系统设计首要考虑的问题.研究人员需要将可信计算的安全机制部署到这些移动应用中.可信安全机制包括:确保设备的完整性、认证、隔离和保护.在IT产品设计中信息安全问题已成为重要的问题.本文提出了一个框架,在多核计算机平台上模拟可信手持移动终端(THT)并对其进行性能分析.

  20. Detecting antipersonnel mines with a handheld parabolic reflector transmitter/multistatic receiver impulse gpr

    Energy Technology Data Exchange (ETDEWEB)

    Rappaport, C; Yang, B; Azevedo, S; Rosenbury, T; Gough, J; Dean, A

    2000-04-10

    A novel handheld time-domain array GPR antipersonnel mine detection system using an offset paraboloidal reflector antenna is described. The reflector collimates rays from an ultra-wideband transmitting feed, directing the microwave impulse forward, in front of the antenna structure. As such, much of the ground reflected wave is directed further forward, away from the operator, the reflector, and the receiving antennas, and thereby reducing the major source of clutter. The wave transmitted into the ground that interacts with the target, generating significant backscatter returning toward the receiving antennas. These receiving antennas are configured in a 2 by 2 array to provide spatial focusing in both the along- and cross-track directions. This system has been built and tested at both Lawrence Livermore National Laboratory, and GeoCenters, Inc. In both cases, custom-built wideband antenna elements generate narrow pulse shapes, which allow for resolving small non-metallic targets buried at shallow depths. The LLNL's Micro-Power Impulse Radar (MIR) operates in the 1.5 to 5 GHz range a very narrow pulse shape. The Geo-Centers wideband TEMR antenna elements have higher power, though lower frequency range (850 to 1700 MHz), and generate less residual ringing in the time signal. Preliminary measured data from both systems indicate that the surface clutter is indeed reduced relative to the target signal, and that small non-metallic anti-personnel mines can be reliably detected at burial depths as shallow as 1 inch in both dry sand and dry vegetative clay loam soil.

  1. A Mobile Mixed-Reality Environment for Children's Storytelling Using a Handheld Projector and a Robot

    Science.gov (United States)

    Sugimoto, Masanori

    2011-01-01

    This paper describes a system called GENTORO that uses a robot and a handheld projector for supporting children's storytelling activities. GENTORO differs from many existing systems in that children can make a robot play their own story in a physical space augmented by mixed-reality technologies. Pilot studies have been conducted to clarify the…

  2. Handheld multispectral dual-axis confocal microscope for cervical cancer screening

    Science.gov (United States)

    Sarapukdee, Pongsak; Rattanavarin, Santi; Jarujareet, Ungkarn; Khemthongcharoen, Numfon; Jolivot, Romuald; Jung, Il Woong; López, Daniel; Mandella, Michael J.; Piyawattanametha, Wibool

    2013-03-01

    Our work demonstrates a MEMS based handheld dual-axis confocal microscope for cervical cancer screening. Imaging demonstration is performed with plant and animal tissue biopsies. The data is collected and displayed in real time with 2-5 Hz frame rates.

  3. 78 FR 68862 - Certain Handheld Magnifiers and Products Containing Same; Institution of Investigation Pursuant...

    Science.gov (United States)

    2013-11-15

    ... COMMISSION Certain Handheld Magnifiers and Products Containing Same; Institution of Investigation Pursuant to..., under section 337 of the Tariff Act of 1930, as amended, 19 U.S.C. 1337, on behalf of Freedom Scientific... investigation and, after the investigation, issue a limited exclusion order and cease and desist...

  4. Detection of fecal contamination on beef meat surfaces using handheld fluorescence imaging device (HFID)

    Science.gov (United States)

    Current meat inspection in slaughter plants, for food safety and quality attributes including potential fecal contamination, is conducted through by visual examination human inspectors. A handheld fluorescence-based imaging device (HFID) was developed to be an assistive tool for human inspectors by ...

  5. Measurement of muscle strength with handheld dynamometer in Intensive Care Unit

    Directory of Open Access Journals (Sweden)

    Nidhi R Samosawala

    2016-01-01

    Full Text Available Background: Intensive Care Unit (ICU acquired weakness is a common complication in critically ill patients affecting their prognosis. The handheld dynamometry is an objective method in detecting minimum muscle strength change, which has an impact on the physical function of ICU survivors. The minimal change in the force can be measured in units of weight such as pounds or kilograms. Aim of the Study: To detect the changes in peripheral muscle strength with handheld dynamometer in the early stage of ICU stay and to observe the progression of muscle weakness. Methodology: Three upper and three lower limb muscles force measured with handheld dynamometer during ICU stay. Data were analyzed using repeated measures ANOVA to detect changes in force generated by muscle on alternate days of ICU stay. Results: There was a reduction in peripheral muscle strength from day 3 to day 5 as well from day 5 to day 7 of ICU stay (P < 0.01. The average reduction in peripheral muscle strength was 11.8% during ICU stay. Conclusion: This study showed a progressive reduction in peripheral muscle strength as measured by handheld dynamometer during early period of ICU stay.

  6. The Use of Handheld Devices for Improved Phonemic Awareness in a Traditional Kindergarten Classroom

    Science.gov (United States)

    Magagna-McBee, Cristy Ann

    2010-01-01

    Effective teaching strategies that improve the development of phonemic awareness are important to ensure students are fluent readers by third grade. The use of handheld devices to improve phonemic awareness with kindergarten students may be such a strategy, but no research exists that evaluates the use of these devices. This study explored the…

  7. Xsense: using nanotechnology to combine detection methods for high sensitivity handheld explosives detectors

    DEFF Research Database (Denmark)

    Schmidt, Michael Stenbæk; Kostesha, Natalie; Bosco, Filippo;

    2010-01-01

    In an effort to produce a handheld explosives sensor the Xsense project has been initiated at the Technical University of Denmark in collaboration with a number of partners. Using micro- and nano technological approaches it will be attempted to integrate four detection principles into a single de...

  8. Monitoring of WEEE plastics in regards to brominated flame retardants using handheld XRF.

    Science.gov (United States)

    Aldrian, Alexia; Ledersteger, Alfred; Pomberger, Roland

    2015-02-01

    This contribution is focused on the on-site determination of the bromine content in waste electrical and electronic equipment (WEEE), in particular waste plastics from television sets (TV) and personal computer monitors (PC) using a handheld X-ray fluorescence (XRF) device. The described approach allows the examination of samples in regards to the compliance with legal specifications for polybrominated biphenyls (PBBs) and polybrominated diphenyl ethers (PBDEs) directly after disassembling and facilitates the sorting out of plastics with high contents of brominated flame retardants (BFRs). In all, over 3000 pieces of black (TV) and 1600 pieces of grey (PC) plastic waste were analysed with handheld XRF technique for this study. Especially noticeable was the high percentage of pieces with a bromine content of over 50,000ppm for TV (7%) and PC (39%) waste plastics. The applied method was validated by comparing the data of handheld XRF with results obtained by GC-MS. The results showed the expected and sufficiently accurate correlation between these two methods. It is shown that handheld XRF technique is an effective tool for fast monitoring of large volumes of WEEE plastics in regards to BFRs for on-site measurements. PMID:25464945

  9. 77 FR 73354 - Safety Standard for Hand-Held Infant Carriers

    Science.gov (United States)

    2012-12-10

    ... cradles. 77 FR 64055. Further, EN 12790 European/British Standard for Child Care Articles--Reclined... COMMISSION 16 CFR Parts 1112 and 1225 RIN 3041-AD16 Safety Standard for Hand-Held Infant Carriers AGENCY... promulgate consumer product safety standards for durable infant or toddler products. These standards are...

  10. A Study of the Use of a Handheld Computer Algebra System in Discrete Mathematics

    Science.gov (United States)

    Powers, Robert A.; Allison, Dean E.; Grassl, Richard M.

    2005-01-01

    This study investigated the impact of the TI-92 handheld Computer Algebra System (CAS) on student achievement in a discrete mathematics course. Specifically, the researchers examined the differences between a CAS section and a control section of discrete mathematics on students' in-class examinations. Additionally, they analysed student approaches…

  11. 75 FR 43206 - In the Matter of Certain Wireless Communications System Server Software, Wireless Handheld...

    Science.gov (United States)

    2010-07-23

    ..., 2010, based on a complaint filed by Motorola, Inc. (``Motorola'') of Schaumburg, Illinois. 75 FR 8401... COMMISSION In the Matter of Certain Wireless Communications System Server Software, Wireless Handheld Devices... its Internet server at http://www.usitc.gov . The public record for this investigation may be...

  12. Monitoring of WEEE plastics in regards to brominated flame retardants using handheld XRF

    Energy Technology Data Exchange (ETDEWEB)

    Aldrian, Alexia, E-mail: alexia.aldrian@unileoben.ac.at [Chair of Waste Processing Technology and Waste Management, Montanuniversitaet Leoben, Franz-Josef-Straße 18, 8700 Leoben (Austria); Ledersteger, Alfred, E-mail: a.ledersteger@saubermacher.at [Saubermacher Dienstleistungs AG, Hans-Roth-Straße 1, 8073 Feldkirchen bei Graz (Austria); Pomberger, Roland, E-mail: roland.pomberger@unileoben.ac.at [Chair of Waste Processing Technology and Waste Management, Montanuniversitaet Leoben, Franz-Josef-Straße 18, 8700 Leoben (Austria)

    2015-02-15

    Highlights: • Specification of an empirical factor for conversion from bromine to PBB and PBDE. • The handheld XRF device was validated for this particular application. • A very large number of over 4600 pieces of monitor housings was analysed. • The recyclable fraction mounts up to 85% for TV but only 53% of PC waste plastics. • A high percentage of pieces with bromine contents of over 50,000 ppm was obtained. - Abstract: This contribution is focused on the on-site determination of the bromine content in waste electrical and electronic equipment (WEEE), in particular waste plastics from television sets (TV) and personal computer monitors (PC) using a handheld X-ray fluorescence (XRF) device. The described approach allows the examination of samples in regards to the compliance with legal specifications for polybrominated biphenyls (PBBs) and polybrominated diphenyl ethers (PBDEs) directly after disassembling and facilitates the sorting out of plastics with high contents of brominated flame retardants (BFRs). In all, over 3000 pieces of black (TV) and 1600 pieces of grey (PC) plastic waste were analysed with handheld XRF technique for this study. Especially noticeable was the high percentage of pieces with a bromine content of over 50,000 ppm for TV (7%) and PC (39%) waste plastics. The applied method was validated by comparing the data of handheld XRF with results obtained by GC–MS. The results showed the expected and sufficiently accurate correlation between these two methods. It is shown that handheld XRF technique is an effective tool for fast monitoring of large volumes of WEEE plastics in regards to BFRs for on-site measurements.

  13. Handheld computers for self-administered sensitive data collection: A comparative study in Peru

    Directory of Open Access Journals (Sweden)

    Hughes James P

    2008-03-01

    Full Text Available Abstract Background Low-cost handheld computers (PDA potentially represent an efficient tool for collecting sensitive data in surveys. The goal of this study is to evaluate the quality of sexual behavior data collected with handheld computers in comparison with paper-based questionnaires. Methods A PDA-based program for data collection was developed using Open-Source tools. In two cross-sectional studies, we compared data concerning sexual behavior collected with paper forms to data collected with PDA-based forms in Ancon (Lima. Results The first study enrolled 200 participants (18–29 years. General agreement between data collected with paper format and handheld computers was 86%. Categorical variables agreement was between 70.5% and 98.5% (Kappa: 0.43–0.86 while numeric variables agreement was between 57.1% and 79.8% (Spearman: 0.76–0.95. Agreement and correlation were higher in those who had completed at least high school than those with less education. The second study enrolled 198 participants. Rates of responses to sensitive questions were similar between both kinds of questionnaires. However, the number of inconsistencies (p = 0.0001 and missing values (p = 0.001 were significantly higher in paper questionnaires. Conclusion This study showed the value of the use of handheld computers for collecting sensitive data, since a high level of agreement between paper and PDA responses was reached. In addition, a lower number of inconsistencies and missing values were found with the PDA-based system. This study has demonstrated that it is feasible to develop a low-cost application for handheld computers, and that PDAs are feasible alternatives for collecting field data in a developing country.

  14. Development of Real-Time Dual-Display Handheld and Bench-Top Hybrid-Mode SD-OCTs

    Directory of Open Access Journals (Sweden)

    Nam Hyun Cho

    2014-01-01

    Full Text Available Development of a dual-display handheld optical coherence tomography (OCT system for retina and optic-nerve-head diagnosis beyond the volunteer motion constraints is reported. The developed system is portable and easily movable, containing the compact portable OCT system that includes the handheld probe and computer. Eye posterior chambers were diagnosed using the handheld probe, and the probe could be fixed to the bench-top cradle depending on the volunteers’ physical condition. The images obtained using this handheld probe were displayed in real time on the computer monitor and on a small secondary built-in monitor; the displayed images were saved using the handheld probe’s built-in button. Large-scale signal-processing procedures such as k-domain linearization, fast Fourier transform (FFT, and log-scaling signal processing can be rapidly applied using graphics-processing-unit (GPU accelerated processing rather than central-processing-unit (CPU processing. The Labview-based system resolution is 1,024 × 512 pixels, and the frame rate is 56 frames/s, useful for real-time display. The 3D images of the posterior chambers including the retina, optic-nerve head, blood vessels, and optic nerve were composed using real-time displayed images with 500 × 500 × 500 pixel resolution. A handheld and bench-top hybrid mode with a dual-display handheld OCT was developed to overcome the drawbacks of the conventional method.

  15. Impacts of the SCA Core Framework on High Speed Broadband Waveform in SDR Handheld System

    Science.gov (United States)

    Oh, Sangchul; Park, Namhoon; Kwon, Ohjun; Kim, Yeongjin

    In this paper, we have shown a major element occupying the large portion of software communications architecture (SCA)-based software defined radio (SDR) handheld embedded system and an important feature for implementing a high speed broadband radio to an SCA waveform through a couple of experiments. First, this paper identifies the main items possessing the large portion of SCA-based SDR handheld embedded system by the experiment on the target platform which is similar to a commercial mobile handheld system. Both the world interoperabillity for microwave access (WiMAX) and high speed downlink packet access (HSDPA) waveform software packages are used as an SCA waveform application. This paper also presents the results of the relative binary size distribution of SCA software resources for looking for the major elements making an SCA-based SDR handheld embedded system heavier. As a result, when focusing on the relative weight portion of SCA core framework (CF), the SCA CF takes 16% up and others have 84% out of the whole binary size distribution of SCA software resources. The results of the experiment give us notice that the weight portion of SCA CF is minor and compatible with the overall software binary size needs of an SCA-based SDR handheld embedded system, on the other hand, the practical problem on the lightweight is in a common object request broker architecture (CORBA) and extensible markup language (XML) parser resources. Second, this paper describes an important feature for implementing a high speed broadband radio to an SCA waveform and presents the performance evaluation results of the SCA port communication on both power PC (PPC) 405 and x86 processor platforms. The PPC 405 platform, which is similar to a commercial mobile handset, takes the value of average round trip time (RTT) with a maximum of thirty six millisecond. The x86 platform, however, which is analogous to a server platform, maintains stable micro-second resolution. From our experiments, we

  16. Mad City Mystery: Developing Scientific Argumentation Skills with a Place-based Augmented Reality Game on Handheld Computers

    Science.gov (United States)

    Squire, Kurt D.; Jan, Mingfong

    2007-02-01

    While the knowledge economy has reshaped the world, schools lag behind in producing appropriate learning for this social change. Science education needs to prepare students for a future world in which multiple representations are the norm and adults are required to "think like scientists." Location-based augmented reality games offer an opportunity to create a "post-progressive" pedagogy in which students are not only immersed in authentic scientific inquiry, but also required to perform in adult scientific discourses. This cross-case comparison as a component of a design-based research study investigates three cases (roughly 28 students total) where an Augmented Reality curriculum, Mad City Mystery, was used to support learning in environmental science. We investigate whether augmented reality games on handhelds can be used to engage students in scientific thinking (particularly argumentation), how game structures affect students' thinking, the impact of role playing on learning, and the role of the physical environment in shaping learning. We argue that such games hold potential for engaging students in meaningful scientific argumentation. Through game play, players are required to develop narrative accounts of scientific phenomena, a process that requires them to develop and argue scientific explanations. We argue that specific game features scaffold this thinking process, creating supports for student thinking non-existent in most inquiry-based learning environments.

  17. Techniques for identifying the applicability of new information management technologies in the clinical setting: an example focusing on handheld computers.

    OpenAIRE

    Sittig, D. F.; Jimison, H. B.; Hazlehurst, B. L.; Churchill, B. E.; Lyman, J. A.; Mailhot, M. F.; Quick, E. A.; Simpson, D A

    2000-01-01

    This article describes techniques and strategies used to judge the potential applicability of new information management technologies in the clinical setting and to develop specific design recommendations for new features and services. We focus on a project carried out to identify the potential uses of handheld computers (i.e., the Palm Pilot or a small WinCE-based device) in the ambulatory practice setting. We found that the potential for a robust handheld computing device to positively affe...

  18. A Study on Digital Video Broadcasting to a Handheld Device (DVB-H), Operating in UHF Band

    CERN Document Server

    Masood, Farhat

    2011-01-01

    In this paper, we will understand that the development of the Digital Video Broadcasting to a Handheld (DVB-H) standard makes it possible to deliver live broadcast television to a mobile handheld device. Building upon the strengths of the Digital Video Broadcasting - Terrestrial (DVB-T) standard in use in millions of homes, DVB-H recognizes the trend towards the personal consumption of media.

  19. SkinScan©: A PORTABLE LIBRARY FOR MELANOMA DETECTION ON HANDHELD DEVICES.

    Science.gov (United States)

    Wadhawan, Tarun; Situ, Ning; Lancaster, Keith; Yuan, Xiaojing; Zouridakis, George

    2011-03-30

    We have developed a portable library for automated detection of melanoma termed SkinScan© that can be used on smartphones and other handheld devices. Compared to desktop computers, embedded processors have limited processing speed, memory, and power, but they have the advantage of portability and low cost. In this study we explored the feasibility of running a sophisticated application for automated skin cancer detection on an Apple iPhone 4. Our results demonstrate that the proposed library with the advanced image processing and analysis algorithms has excellent performance on handheld and desktop computers. Therefore, deployment of smartphones as screening devices for skin cancer and other skin diseases can have a significant impact on health care delivery in underserved and remote areas. PMID:21892382

  20. Design of an Optical Character Recognition System for Camera-based Handheld Devices

    Directory of Open Access Journals (Sweden)

    Ayatullah Faruk Mollah

    2011-07-01

    Full Text Available This paper presents a complete Optical Character Recognition (OCR system for camera captured image/graphics embedded textual documents for handheld devices. At first, text regions are extracted and skew corrected. Then, these regions are binarized and segmented into lines and characters. Characters are passed into the recognition module. Experimenting with a set of 100 business card images, captured by cell phone camera, we have achieved a maximum recognition accuracy of 92.74%. Compared to Tesseract, an open source desktop-based powerful OCR engine, present recognition accuracy is worth contributing. Moreover, the developed technique is computationally efficient and consumes low memory so as to be applicable on handheld devices.

  1. A conceptual application for computer-based procedures for handheld devices

    Energy Technology Data Exchange (ETDEWEB)

    Sofie, Lunde-Hanssen Linda [Industrial Psychology, Institute for Energy Technology, Halden (Norway)

    2014-08-15

    This paper describes the concepts and proposed design principles for an application for computer-based procedures (CBPs) for field operators in the nuclear domain (so-called handheld procedures). The concept is focused on the field operators' work with procedures and the communication and coordination between field operators and control room operators. The goal is to overcome challenges with shared situation awareness (SA) in a distributed team by providing effective and usable information design. An iterative design method and user-centred design is used for tailoring the concept to the context of field operations. The resulting concept supports the execution of procedures where close collaboration is needed between control room and field operations, e.g. where particular procedure steps are executed from remote control points and others from the control room. The resulting conceptual application for CBPs on handheld devices is developed for mitigating the SA challenges and designing for usability and ease of use.

  2. Facile residue analysis of recent and prehistoric cook-stones using handheld Raman spectrometry

    CERN Document Server

    Short, Laura; Cao, Bin; Sinyukov, Alexander M; Joshi, Amitabh; Scully, Rob; Sanders, Virgil; Voronine, Dmitri V

    2013-01-01

    We performed food residue analysis of cook-stones from experimental and prehistoric earth ovens using a handheld Raman spectrometry. Progress in modern optical technology provides a facile means of rapid non-destructive identification of residue artifacts from archaeological sites. For this study spectral signatures were obtained on sotol (Dasylirion spp.) experimentally baked in an earth oven as well as sotol residue on an experimentally used processing tool. Inulin was the major residue component. The portable handheld Raman spectrometer also detected traces of inulin on boiling stones used to boil commercially obtained inulin. The Raman spectra of inulin and sotol may be useful as signatures of wild plant residues in archaeology. Spectroscopic analysis of millennia-old cook-stones from prehistoric archaeological sites in Fort Hood, TX revealed the presence of residues whose further identification requires improvement of current optical methods.

  3. Computer implemented method, and apparatus for controlling a hand-held tool

    Science.gov (United States)

    Wagner, Kenneth William (Inventor); Taylor, James Clayton (Inventor)

    1999-01-01

    The invention described here in is a computer-implemented method and apparatus for controlling a hand-held tool. In particular, the control of a hand held tool is for the purpose of controlling the speed of a fastener interface mechanism and the torque applied to fasteners by the fastener interface mechanism of the hand-held tool and monitoring the operating parameters of the tool. The control is embodied in intool software embedded on a processor within the tool which also communicates with remote software. An operator can run the tool, or through the interaction of both software, operate the tool from a remote location, analyze data from a performance history recorded by the tool, and select various torque and speed parameters for each fastener.

  4. Using a Handheld Device for Patient Data Collection: A Pilot for Medical Countermeasures Surveillance.

    Science.gov (United States)

    Daley, Matthew F; Goddard, Kristin; McClung, Melissa; Davidson, Arthur; Weiss, Gretchen; Palen, Ted; Nyirenda, Carsie; Platt, Richard; Courtney, Brooke; Reichman, Marsha E

    2016-01-01

    Medical countermeasures (MCMs) are medical products used during public health emergencies. This study, conducted within the Mini-Sentinel Initiative, sought to develop the patient identification and matching processes necessary to assess safety outcomes for MCMs. A handheld device was used to collect identifying information (e.g., name, birthdate, and sex) from the driver's licenses of 421 individuals presenting for routine care at their primary care medical office. Overall, 374 individuals (88.8%) could be linked to their electronic health data using driver's license information. The device was also pilot-tested at a seasonal influenza immunization clinic: detailed vaccine information (e.g., lot number and manufacturer) was captured with a high degree of accuracy. This investigation demonstrated that a handheld device is a feasible means of collecting patient identity and medical product receipt data. This capacity should be useful for safety surveillance of MCMs, particularly when dispensed in settings outside the traditional health-care delivery system. PMID:26843667

  5. Tracing euxinia by molybdenum concentrations in sediments using handheld X-ray fluorescence spectroscopy (HHXRF)

    DEFF Research Database (Denmark)

    Dahl, Tais W.; Ruhl, Micha; Hammarlund, Emma U.;

    2013-01-01

    sigma) after a daily calibration to samples covering a range of Mo concentrations from 0 to >30 ppm. Hand-held XRF equipment also allows Mo measurements directly on fresh rock surfaces, both in the field and under laboratory conditions. Rock-samples from a Cambrian drill core closely match ICPMS...... levels is, however, expensive and cannot be directly performed in the field. Here, we show that handheld x-ray absorption spectroscopy (HHXRF) on both rock-powders and rock surfaces provides a powerful tool for laboratory or field-based, geochemical characterization of Mo content and the tracing...... with Mo: 47 ppm and NIST-2702 with Mo: 10 ppm) for analytical control. Analytical precision (1 sigma) after 30, 120, and 300 seconds of measuring time was 4, 2, and 1 ppm, with a respective detection limit of 11, 5, 3 ppm (3 sigma, noise level). The data were accurate to within the given precision (1...

  6. Alltagsnahe Psychologie mit hand-held PC und physiologischem Mess-System.

    OpenAIRE

    Fahrenberg, Jochen; Leonhart, Rainer; Foerster, Friedrich

    2002-01-01

    Alltagsnahe Psychologie und ökologische Validität sind wichtige Ziele psychologischer Forschung und Praxis. Die computer-unterstützte Methodik kann mit innovativen Strategien zu diesen Zielen wesentlich beitragen. Hand-held PC und kleine Datenrekorder für physiologische Messungen ermöglichen neue Forschungsansätze und praktische Anwendungen. Sind nicht auch Verhaltensprobleme viel überzeugender dort zu untersuchen, wo sie entstanden sind: im Alltag? Das ambulante Monitoring des Blutdrucks ode...

  7. Programmable hand-held calculators in the operating forces of the Marine Corps

    OpenAIRE

    Reeve, James LeBaron

    1981-01-01

    Approved for public release; distribution is unlimited This thesis provides usage and cost data on programmable hand-held calculators (PHHC's) in the operating force of the U.S. Marine Corps (USMC). In 1978 PHHC's that computerized aircraft performance charts were procured for USMC AV-8A pilots. During 1979 the U.S. Army successfully tested and began procuring a PHHC for use by artillery fire directions centers (FDC's). USMC artillery batteries will receive this PHHC in 1981 In 1980 th...

  8. Absolute reliability of shoulder joint horizontal adductor muscle strength measurements using a handheld dynamometer

    OpenAIRE

    Hirano, Masahiro; Katoh, Munenori

    2015-01-01

    [Purpose] The aim of this study was to verify the absolute reliability of shoulder joint horizontal adductor muscle strength measurements using a handheld dynamometer (HHD). [Subjects and Methods] The subjects were 33 healthy college students. The measurements were made three times with the HHD fixed using a belt (BFHHD) or with the examiner’s hand (conventional method; HFHHD). The absolute reliability of measurements was verified using Bland-Altman analysis, both in the all subjects group an...

  9. Backward Compatibility to Sustain Market Dominance – Evidence from the US Handheld Video Game Industry

    OpenAIRE

    Claussen, Jörg; Kretschmer, Tobias; Spengler, Thomas

    2010-01-01

    The introduction of a new product generation forces incumbents in network industries to rebuild their installed base to maintain an advantage over potential entrants. We study if backward compatibility can help moderate this process of rebuilding an installed base. Using a structural model of the US market for handheld game consoles, we show that backward compatibility lets incumbents transfer network effects from the old generation to the new to some extent but that it also reduces supply of...

  10. Detection of airflow limitation using a handheld spirometer in a primary care setting

    OpenAIRE

    Ching, Siew-Mooi; Pang, Yong-Kek; Price, David; Cheong, Ai-Theng; Lee, Ping-Yein; Irmi, Ismail; Faezah, Hassan; Ruhaini, Ismail; Chia, Yook-Chin

    2014-01-01

    Background and objective Early diagnosis of chronic obstructive pulmonary disease (COPD) in primary care settings is difficult to achieve chiefly due to lack of availability of spirometry. This study estimated the prevalence of airflow limitation among chronic smokers using a handheld spirometer in this setting. Methods This is a cross-sectional study performed on consecutive patients who were ≥40 years old with ≥10 pack-years smoking history. Face-to-face interviews were carried out to obtai...

  11. Remote presence: supporting deictic gestures through a handheld multi-touch device

    OpenAIRE

    Jorge, Clinton Luis

    2013-01-01

    This thesis argues on the possibility of supporting deictic gestures through handheld multi-touch devices in remote presentation scenarios. In [1], Clark distinguishes indicative techniques of placing-for and directing-to, where placing-for refers to placing a referent into the addressee’s attention, and directing-to refers to directing the addressee’s attention towards a referent. Keynote, PowerPoint, FuzeMeeting and others support placing-for efficiently with slide transitions, and animatio...

  12. Handheld Fluorescence Resonance Energy Transfer (FRET)-Aptamer Sensor for Bone Markers

    Science.gov (United States)

    Bruno, John G.

    2015-01-01

    Astronauts lose significant bone mass during lengthy space flights. NASA wishes to monitor this bone loss in order to develop nutritional and exercise countermeasures. Operational Technologies Corporation (OpTech) has developed a handheld device that quantifies bone loss in a spacecraft environment. The innovation works by adding fluorescent dyes and quenchers to aptamers to enable pushbutton, one-step bind-and-detect FRET assays that can be freeze-dried, rehydrated with body fluids, and used to quantify bone loss.

  13. Market leadership through technology – Backward compatibility in the U.S. Handheld Video Game Industry

    OpenAIRE

    Claussen, Jörg; Kretschmer, Tobias; Spengler, Thomas

    2010-01-01

    The introduction of a new product generation forces incumbents in network industries to rebuild their installed base to maintain an advantage over potential entrants. We study if backward compatibility moderates this process of rebuilding an installed base. Using a structural model of the U.S. market for handheld game consoles, we show that backward compatibility lets incumbents transfer network effects from the old generation to the new to some extent but that it also reduces supply of new s...

  14. Analysis of Hand-Held Phones Using the Finite Integration Algorithm

    Directory of Open Access Journals (Sweden)

    R. Dlouhy

    1996-12-01

    Full Text Available Two different hand-held phones operating at 1.8 GHz are numerically analyzed, applying a field calculation program MAFIA (MAxwell's equations using the Finite Integration Algorithm. One phone contains a Back-Mounted Microstrip Double Patch Antenna (BMMDPA, the other, for comparison a conventional monopole. Realistic models of the the handset, the head and the hand are used to gain a detailed understanding of the antenna properties, as well as of the antenna-tissue interaction.

  15. Winter wheat stand density determination and yield estimates from handheld and airborne scanners. [Montana

    Science.gov (United States)

    Aase, J. K.; Millard, J. P.; Siddoway, F. H. (Principal Investigator)

    1982-01-01

    Radiance measurements from handheld (Exotech 100-A) and air-borne (Daedalus DEI 1260) radiometers were related to wheat (Triticum aestivum L.) stand densities (simulated winter wheat winterkill) and to grain yield for a field located 11 km northwest of Sidney, Montana, on a Williams loam soil (fine-loamy, mixed Typic Argiborolls) where a semidwarf hard red spring wheat cultivar was needed to stand. Radiances were measured with the handheld radiometer on clear mornings throughout the growing season. Aircraft overflight measurements were made at the end of tillering and during the early stem extension period, and the mid-heading period. The IR/red ratio and normalized difference vegetation index were used in the analysis. The aircraft measurements corroborated the ground measurements inasmuch as wheat stand densities were detected and could be evaluated at an early enough growth stage to make management decision. The aircraft measurements also corroborated handheld measurements when related to yield prediction. The IR/red ratio, although there was some growth stage dependency, related well to yield when measured from just past tillering until about the watery-ripe stage.

  16. A Method to Build a Super Small but Practically Accurate Language Model for Handheld Devices

    Institute of Scientific and Technical Information of China (English)

    WU GenQing (吴根清); ZHENG Fang (郑方)

    2003-01-01

    In this paper, an important question, whether a small language model can be practically accurate enough, is raised. Afterwards, the purpose of a language model, the problems that a language model faces, and the factors that affect the performance of a language model,are analyzed. Finally, a novel method for language model compression is proposed, which makes the large language model usable for applications in handheld devices, such as mobiles, smart phones, personal digital assistants (PDAs), and handheld personal computers (HPCs). In the proposed language model compression method, three aspects are included. First, the language model parameters are analyzed and a criterion based on the importance measure of n-grams is used to determine which n-grams should be kept and which removed. Second, a piecewise linear warping method is proposed to be used to compress the uni-gram count values in the full language model. And third, a rank-based quantization method is adopted to quantize the bi-gram probability values. Experiments show that by using this compression method the language model can be reduced dramatically to only about 1M bytes while the performance almost does not decrease. This provides good evidence that a language model compressed by means of a well-designed compression technique is practically accurate enough, and it makes the language model usable in handheld devices.

  17. Hand-held resonance sensor for tissue stiffness measurements—a theoretical and experimental analysis

    International Nuclear Information System (INIS)

    A piezoelectric transducer in a feedback circuit operating in a resonance state is the basis of a resonance sensor. Upon contact with a soft object a change in the resonance frequency reflects the acoustic impedance. Together with force measurement it is possible to obtain the elastic stiffness of the object. The aim of this study was to evaluate the concept of a hand-held resonance sensor for tissue stiffness measurement. A time derivative analysis of the force and the frequency change showed that a stiffness-sensitive parameter was independent of the impression speed. Soft tissue phantoms of gelatin were used in an experimental validation of the theory. A force indentation method was used as a reference method for assessing the gelatin's elastic stiffness. Results from the hand-held measurements showed that the stiffness parameter accurately measured the elastic stiffness of the gelatin (R2 = 0.94, p 2 = 0.15) and non-significantly (p > 0.05, 14 out of 17) dependent on an impression speed parameter. On average, a small amount of the total variance was explained by the impression speed. In conclusion, soft tissue stiffness can be objectively measured with free-hand measurement with a resonance sensor. This study contributes a theoretical analysis and an experimental demonstration of the concept of a hand-held resonance sensor for stiffness measurements

  18. Application of Handheld Tele-ECG for Health Care Delivery in Rural India

    Directory of Open Access Journals (Sweden)

    Meenu Singh

    2014-01-01

    Full Text Available Telemonitoring is a medical practice that involves remotely monitoring patients who are not at the same location as the health care provider. The purpose of our study was to use handheld tele-electrocardiogram (ECG developed by Bhabha Atomic Research Center (BARC to identify heart conditions in the rural underserved population where the doctor-patient ratio is low and access to health care is difficult. The objective of our study was clinical validation of handheld tele-ECG as a screening tool for evaluation of cardiac diseases in the rural population. ECG was obtained in 450 individuals (mean age 31.49 ± 20.058 residing in the periphery of Chandigarh, India, from April 2011 to March 2013, using the handheld tele-ECG machine. The data were then transmitted to physicians in Postgraduate Institute of Medical Education and Research (PGIMER, Chandigarh, for their expert opinion. ECG was interpreted as normal in 70% individuals. Left ventricular hypertrophy (9.3% was the commonest abnormality followed closely by old myocardial infarction (5.3%. Patient satisfaction was reported to be ~95%. Thus, it can be safely concluded that tele-ECG is a portable, cost-effective, and convenient tool for diagnosis and monitoring of heart diseases and thus improves quality and accessibility, especially in rural areas.

  19. New portable hand-held radiation instruments for measurements and monitoring

    International Nuclear Information System (INIS)

    Hand-held radiation monitors are often used to search pedestrians and motor vehicles for special nuclear material (SNM) as part of a physical protection plan for nuclear materials. Recently, the Los Alamos Advanced Nuclear Technology group has commercialized an improved hand-held monitor that can be used for both physical-protection monitoring and verification measurements in nuclear material control and waste management. The new monitoring instruments are smaller and lighter; operate much longer on a battery charge; are available with NaI(Tl) or neutron and gamma-ray sensitive plastic scintillation detectors; and are less expensive than other comparable instruments. They also have a second operating mode for making precise measurements over counting times as long as 99 s. This mode permits making basic verification measurements that may be needed before transporting nuclear material or waste outside protected areas. Improved verification measurements can be made with a second new hand-held instrument that has a stabilized detector and three separate gamma-ray energy windows to obtain spectral information for SNM quantity, enrichment, or material-type verification

  20. In-Network Performance of Handheld Mobile Terminals

    OpenAIRE

    Nielsen, Jesper Ødum; Pedersen, Gert Frølund

    2006-01-01

    Udgivelsesdato: MAY This paper considers realistic evaluation of the power mobile handsets are able to transmit and receive. It has been suggested to use the so-called total radiated power (TRP) and the total isotropic sensitivity (TIS) for the up-link and down-link, respectively, which may be seen as special cases of the general mean effective gain (MEG) measure. These measures are computed from the spherical radiation pattern of the handset and the different measures are obtained by usin...

  1. Hand-Held Devices for the Detection of Clandestine Nuclear Material on Site

    International Nuclear Information System (INIS)

    The potential threat of nuclear material out of legal control has become an increasingly important issue for the international community in the last years. Improvised Nuclear Devices (IND) and Dirty Bombs may have far reaching consequences, e.g., contaminating vast areas and even killing people, when successfully detonated by terrorists or terrorist groups. Whereas the declared nuclear material in the nuclear fuel cycle is under good control by international safeguards it is difficult to cope with undeclared or stolen nuclear material. The best detectors and sophisticated methods have to be used to reveal undeclared as well as clandestine nuclear material or activities. Important means for detecting such material are portal monitors and other fixed installations at state boarders and gateways of nuclear and industrial facilities. In addition mobile measuring systems are of great importance. These fixed installations and mobile measuring systems have to be supplemented by reliable and easy to use hand-held devices for the detection of gamma and neutron radiation emitted by the material. Hand-held devices may not only be used in combination with fixed installations and mobile systems but may also support police men or fire fighters to detect illicit radioactive and nuclear material. We tested a variety of advanced hand-held devices with respect to reliability, ease of use, quality of the user interface, false alarm rate and the generation of wrong results. Another important issue is the necessary skill and operating experience of the operational staff in their work. As many users will not be specialist in the area of measurement of radiation the utilization of hand-held devices must be simple and to a great extend fool proof. In this respect we investigated gamma dosimeters and pagers as well as spectroscopic devices, gamma detection systems equipped additionally with a small neutron detector and dedicated neutron devices also. Hand-held devices are an inevitable

  2. MEMS-based handheld fourier domain Doppler optical coherence tomography for intraoperative microvascular anastomosis imaging.

    Directory of Open Access Journals (Sweden)

    Yong Huang

    Full Text Available To demonstrate the feasibility of a miniature handheld optical coherence tomography (OCT imager for real time intraoperative vascular patency evaluation in the setting of super-microsurgical vessel anastomosis.A novel handheld imager Fourier domain Doppler optical coherence tomography based on a 1.3-µm central wavelength swept source for extravascular imaging was developed. The imager was minimized through the adoption of a 2.4-mm diameter microelectromechanical systems (MEMS scanning mirror, additionally a 12.7-mm diameter lens system was designed and combined with the MEMS mirror to achieve a small form factor that optimize functionality as a handheld extravascular OCT imager. To evaluate in-vivo applicability, super-microsurgical vessel anastomosis was performed in a mouse femoral vessel cut and repair model employing conventional interrupted suture technique as well as a novel non-suture cuff technique. Vascular anastomosis patency after clinically successful repair was evaluated using the novel handheld OCT imager.With an adjustable lateral image field of view up to 1.5 mm by 1.5 mm, high-resolution simultaneous structural and flow imaging of the blood vessels were successfully acquired for BALB/C mouse after orthotopic hind limb transplantation using a non-suture cuff technique and BALB/C mouse after femoral artery anastomosis using a suture technique. We experimentally quantify the axial and lateral resolution of the OCT to be 12.6 µm in air and 17.5 µm respectively. The OCT has a sensitivity of 84 dB and sensitivity roll-off of 5.7 dB/mm over an imaging range of 5 mm. Imaging with a frame rate of 36 Hz for an image size of 1000(lateral×512(axial pixels using a 50,000 A-lines per second swept source was achieved. Quantitative vessel lumen patency, lumen narrowing and thrombosis analysis were performed based on acquired structure and Doppler images.A miniature handheld OCT imager that can be used for intraoperative evaluation of

  3. Intrarater reliabilities of shoulder joint horizontal adductor muscle strength measurements using a handheld dynamometer for geriatric and stroke patients.

    Science.gov (United States)

    Hirano, Masahiro; Katoh, Munenori; Kawaguchi, Saori; Uemura, Tomomi

    2016-01-01

    [Purpose] This study aimed to verify the appropriate number of measurements and the intrarater reliabilities of shoulder joint horizontal adductor muscle strength measurements using a handheld dynamometer (HHD) for geriatric and stroke patients. [Subjects and Methods] The subjects were 40 inpatients, who were divided into two groups: 20 stroke patients in the stroke group (SG), and 20 geriatric patients in the no-stroke group (N-SG). Measurements were performed three times using an HHD with a belt. The reliability was verified using Bland-Altman analysis and the intraclass correlation coefficient (ICC). [Results] ICC (1, 1) was >0.9. A systematic bias was not observed between the first and second measurement values except for the right side in N-SG. A systematic bias between the maximum value obtained during the first and second measurements and third measurement value was observed on the left side in N-SG, and on the non-paralyzed side in SG: the third measurement values were small in both cases. [Conclusion] Intrarater reliabilities were high for shoulder horizontal adductor strength measurements using an HHD with a belt for geriatric and stroke patients. Taking the systematic bias into consideration, these findings suggest that the required number of measurements is two. PMID:26957727

  4. Limits of the manipulative-fixed method for measurement of shoulder joint horizontal adduction muscle strength using a handheld dynamometer.

    Science.gov (United States)

    Hirano, Masahiro; Katoh, Munenori

    2015-01-01

    [Purpose] The aim of this study was to verify the limit of isometric muscle strength of shoulder joint horizontal adduction using handheld dynamometer (HHD) manipulated by hand (referred to as the manipulative-fixed method). [Subjects and Methods] The subjects were 33 healthy college students. The examiner was a healthy college student. Shoulder joint horizontal adductor muscle strength was measured using HHD with the subject in the supine position. The belt-fixed and manipulative-fixed methods were used to secure the HHD sensor unit. The limitations of the manipulative-fixed method were assessed by simple regression analysis, in which the participants were divided into 2 groups according to a branch point. The slope of the straight line of the graph was visualized. [Results] Single regression analysis of the 30 kgf group were not significant. [Conclusion] The manipulative-fixed method is simple to perform. However, there exists the possibility that the actual muscle strength is not measurable by this method. The measurement limit of the shoulder horizontal adduction strength with the manipulative-fixed method was 30 kgf in the case of the examiner in the present study. The fixed limit was also found to influence in the muscle strength of the upper limbs. PMID:25642081

  5. Dielectric Resonator Antenna Mounted on Cylindrical Ground Plane for Handheld RFID Reader at 5.8 GHz

    Directory of Open Access Journals (Sweden)

    Hend Abd El-Azem Malhat

    2012-10-01

    Full Text Available Dielectric resonator antenna (DRA mounted on cylindrical ground plane is investigated for handheld RFID reader applications at 5.8 GHz. The simplicity of the structure makes it practical in terms of cost, space, and ease of fabrication. The radiation characteristics of the antenna in free space and in the presence of a proposed compact reader device model and human hand are calculated. The antenna is circularly polarized and exhibits peak gain of 7.62 dB at 5.8 GHz with high front to back ratio of 15.5 dB. Using the same reader device model, a sequentially feeding 2×2 DRA array mounted on the same cylindrical ground plane is used for RFID reader antenna at 5.8 GHz. The array introduces high gain of 9.36 dB at 5.8 GHz with high front to back ratio of 10.48 dB. The 2×2 DRA array elements exhibit circular polarization over a frequency band of 1.1 GHz. The axial ratio is 1.1 dB at 5.8 GHz. The proposed reader model is simple and has a small size compared with that in the case of planar ground plane. The results are calculated using the finite element method (FEM and compared with that calculated using the finite integral technique (FIT.

  6. User certification of hand-held x-ray tube based analytical fluorescent devices in a canadian context

    International Nuclear Information System (INIS)

    Safety education aims to reduce personal injury and improve well being. This health promotion principle is applied in the case of hand-held open beam x-ray tube based analytical x-ray devices. Such devices not only are light weight and portable, but also present high radiation exposure levels at the beam exit port and potentially can be used in a variety of industrial applications for determination of material composition. There is much potential for radiation risks to occur with resultant adverse effects if such devices are not used by trained individuals within controlled environments. A level of radiation safety knowledge and understanding of the device design, construction and performance characteristics appear warranted. To reduce radiation risks, user certification at a federal level was introduced in 2004 based on International Standards Organization 20807, since that standard comprises elements commensurate with risk reduction strategies. Within these contexts, a federally certified user is deemed to have acquired a level of safety knowledge and skills to facilitate safe use of the device. Certification, however, does not absolve the holder from obligations of compliance with applicable provincial, territorial or federal laws respecting device operation. The union of federal certification and applicable legislative mandated operational criteria reduces radiation risks overall. (author)

  7. Application of handheld devices to field research among underserved construction worker populations: a workplace health assessment pilot study

    Directory of Open Access Journals (Sweden)

    Fleming Lora E

    2011-04-01

    Full Text Available Abstract Background Novel low-cost approaches for conducting rapid health assessments and health promotion interventions among underserved worker groups are needed. Recruitment and participation of construction workers is particularly challenging due to their often transient periods of work at any one construction site, and their limited time during work to participate in such studies. In the present methodology report, we discuss the experience, advantages and disadvantages of using touch screen handheld devices for the collection of field data from a largely underserved worker population. Methods In March 2010, a workplace-centered pilot study to examine the feasibility of using a handheld personal device for the rapid health assessment of construction workers in two South Florida Construction sites was undertaken. A 45-item survey instrument, including health-related questions on tobacco exposure, workplace safety practices, musculoskeletal disorders and health symptoms, was programmed onto Apple iPod Touch® devices. Language sensitive (English and Spanish recruitment scripts, verbal consent forms, and survey questions were all preloaded onto the handheld devices. The experience (time to survey administration and capital cost of the handheld administration method was recorded and compared to approaches available in the extant literature. Results Construction workers were very receptive to the recruitment, interview and assessment processes conducted through the handheld devices. Some workers even welcomed the opportunity to complete the questionnaire themselves using the touch screen handheld device. A list of advantages and disadvantages emerged from this experience that may be useful in the rapid health assessment of underserved populations working in a variety of environmental and occupational health settings. Conclusions Handheld devices, which are relatively inexpensive, minimize survey response error, and allow for easy storage of data

  8. Radiation safety of handheld mobile phones and base stations

    International Nuclear Information System (INIS)

    The recent expansion of personal telecommunications has led to a rapid increase in the exposure of people to the radio-frequency (RF) radiation. Although the mobile phones are low power devices, the antenna is so close to the head that the local exposure may slightly exceed 2 W/kg, the current exposure limit for the local specific absorption rate SAR for the general public. The increase in the temperature is, however, too small to have any physiological significance. On the basis of experiments with cell cultures it is possible that other biological effects caused by some unknown non-thermal mechanism exist, but thus far there is no conclusive biological or epidemiological evidence to suggest any diseases or adverse physiological changes below the thermal threshold. The use of a mobile phone by a person wearing a pace-maker, is not recommended, if the immunity of the pace-maker has not been assured. The exposure caused by the base stations is in all practical cases well below the power density limits for general public. (author)

  9. Radiation safety of handheld mobile phones and base stations

    Energy Technology Data Exchange (ETDEWEB)

    Jokela, K.; Leszczynski, D.; Paile, W.; Salomaa, S.; Puranen, L.; Hyysalo, P

    1999-01-01

    The recent expansion of personal telecommunications has led to a rapid increase in the exposure of people to the radio-frequency (RF) radiation. Although the mobile phones are low power devices, the antenna is so close to the head that the local exposure may slightly exceed 2 W/kg, the current exposure limit for the local specific absorption rate SAR for the general public. The increase in the temperature is, however, too small to have any physiological significance. On the basis of experiments with cell cultures it is possible that other biological effects caused by some unknown non-thermal mechanism exist, but thus far there is no conclusive biological or epidemiological evidence to suggest any diseases or adverse physiological changes below the thermal threshold. The use of a mobile phone by a person wearing a pace-maker, is not recommended, if the immunity of the pace-maker has not been assured. The exposure caused by the base stations is in all practical cases well below the power density limits for general public. (author) 118 refs.

  10. Portable handheld diffuse reflectance spectroscopy system for clinical evaluation of skin: a pilot study in psoriasis patients.

    Science.gov (United States)

    Tzeng, Shih-Yu; Guo, Jean-Yan; Yang, Chao-Chun; Hsu, Chao-Kai; Huang, Hung Ji; Chou, Shih-Jie; Hwang, Chi-Hung; Tseng, Sheng-Hao

    2016-02-01

    Diffuse reflectance spectroscopy (DRS) has been utilized to study biological tissues for a variety of applications. However, many DRS systems are not designed for handheld use and/or relatively expensive which limit the extensive clinical use of this technique. In this paper, we report a handheld, low-cost DRS system consisting of a light source, optical switch, and a spectrometer, that can precisely quantify the optical properties of tissue samples in the clinical setting. The handheld DRS system was employed to determine the skin chromophore concentrations, absorption and scattering properties of 11 patients with psoriasis. The measurement results were compared to the clinical severity of psoriasis as evaluated by dermatologist using PASI (Psoriasis Area and Severity Index) scores. Our statistical analyses indicated that the handheld DRS system could be a useful non-invasive tool for objective evaluation of the severity of psoriasis. It is expected that the handheld system can be used for the objective evaluation and monitoring of various skin diseases such as keloid and psoriasis. PMID:26977366

  11. Hand-held echocardiography: added value in clinical cardiological assessment

    Directory of Open Access Journals (Sweden)

    Ballo Piercarlo

    2005-03-01

    Full Text Available Abstract Background The ultrasonic industry has recently produced echocardiographic Hand Held Devices (miniaturized, compact and battery-equipped echocardiographic systems. Their potential usefulness has been successfully assessed in a wide range of clinical conditions. The aim of the study was to verify if the routine use of a basic model of echocardiographic Hand Held Device (HHD could be an important diagnostic tool during outpatient cardiologic consulting or in non-cardiologic hospital sections. Methods 87 consecutive patients were included in this study; they underwent routine physical examination, resting ECG and echocardiographic evaluation using a basic model of HHD performed by trained echocardiographists; the cardiologist, whenever possible, formulated a diagnosis. The percentage of subjects in whom the findings were judged reasonably adequate for final diagnostic and therapeutic conclusions was used to quantify the "conclusiveness" of HHD evaluation. Successively, all patients underwent a second echocardiographic evaluation, by an examiner with similar echocardiographic experience, performed using a Standard Echo Device (SED. The agreement between the first and the second echocardiographic exam was also assessed. Results Mean examination time was 6.7 ± 1.5 min. using HHD vs. 13.6 ± 2.4 min. using SED. The echocardiographic examination performed using HHD was considered satisfactory in 74/87 patients (85.1% conclusiveness. Among the 74 patients for whom the examination was conclusive, the diagnosis was concordant with that obtained with the SED examination in 62 cases (83.8% agreement. Conclusion HHD may generally allow a reliable cardiologic basic evaluation of outpatient or subjects admitted to non-cardiologic sections, more specifically in particular subgroups of patients, with a gain in terms of time, shortening patient waiting lists and reducing healthy costs.

  12. Hand-held echocardiography: added value in clinical cardiological assessment

    Science.gov (United States)

    Giannotti, Giovanna; Mondillo, Sergio; Galderisi, Maurizio; Barbati, Riccardo; Zacà, Valerio; Ballo, Piercarlo; Agricola, Eustachio; Guerrini, Francesco

    2005-01-01

    Background The ultrasonic industry has recently produced echocardiographic Hand Held Devices (miniaturized, compact and battery-equipped echocardiographic systems). Their potential usefulness has been successfully assessed in a wide range of clinical conditions. The aim of the study was to verify if the routine use of a basic model of echocardiographic Hand Held Device (HHD) could be an important diagnostic tool during outpatient cardiologic consulting or in non-cardiologic hospital sections. Methods 87 consecutive patients were included in this study; they underwent routine physical examination, resting ECG and echocardiographic evaluation using a basic model of HHD performed by trained echocardiographists; the cardiologist, whenever possible, formulated a diagnosis. The percentage of subjects in whom the findings were judged reasonably adequate for final diagnostic and therapeutic conclusions was used to quantify the "conclusiveness" of HHD evaluation. Successively, all patients underwent a second echocardiographic evaluation, by an examiner with similar echocardiographic experience, performed using a Standard Echo Device (SED). The agreement between the first and the second echocardiographic exam was also assessed. Results Mean examination time was 6.7 ± 1.5 min. using HHD vs. 13.6 ± 2.4 min. using SED. The echocardiographic examination performed using HHD was considered satisfactory in 74/87 patients (85.1% conclusiveness). Among the 74 patients for whom the examination was conclusive, the diagnosis was concordant with that obtained with the SED examination in 62 cases (83.8% agreement). Conclusion HHD may generally allow a reliable cardiologic basic evaluation of outpatient or subjects admitted to non-cardiologic sections, more specifically in particular subgroups of patients, with a gain in terms of time, shortening patient waiting lists and reducing healthy costs. PMID:15790409

  13. Optoacoustic Imaging of Human Vasculature: Feasibility by Using a Handheld Probe.

    Science.gov (United States)

    Taruttis, Adrian; Timmermans, Arwin C; Wouters, Philip C; Kacprowicz, Marcin; van Dam, Gooitzen M; Ntziachristos, Vasilis

    2016-10-01

    Purpose To investigate whether multispectral optoacoustic tomography (MSOT) developed for deep-tissue imaging in humans could enable the clinical assessment of major blood vessels and microvasculature. Materials and Methods The study was approved by the Institutional Review Board of the University Medical Center Groningen (CCMO-NL-43587) and registered in the Dutch National Trial Registry (NTR4125). The authors designed a real-time handheld optoacoustic scanner for human use, based on a concave 8-MHz transducer array, attaining 135° angular coverage. They applied a single-pulse-frame (SPF) sequence, which enabled motion insensitive optoacoustic imaging during handheld operation. SPF optoacoustic imaging was applied to imaging arteries and microvascular landmarks in the lower extremities of 10 healthy volunteers. The diameters selected microvessels were determined by measuring the full width at half maximum through the vessels in the MSOT images. Duplex ultrasonography was performed on the same landmarks in seven of the 10 volunteers for subjective comparison to the corresponding optoacoustic images. Results Optoacoustic imaging resolved blood vessels as small as 100 µm in diameter and within 1 cm depth. Additionally, MSOT provided images reflecting hemoglobin oxygen saturation in blood vessels, clearly identifying arteries and veins, and was able to identify pulsation in arteries during imaging. Larger blood vessels, specifically the tibialis posterior and the dorsalis pedis arteries, were also visualized with MSOT. Conclusion Handheld MSOT was found to be capable of clinical vascular imaging, providing visualization of major blood vessels and microvasculature and providing images of hemoglobin oxygen saturation and pulsation. (©) RSNA, 2016. PMID:27379543

  14. Handheld ultrahigh speed swept source optical coherence tomography instrument using a MEMS scanning mirror.

    Science.gov (United States)

    Lu, Chen D; Kraus, Martin F; Potsaid, Benjamin; Liu, Jonathan J; Choi, Woojhon; Jayaraman, Vijaysekhar; Cable, Alex E; Hornegger, Joachim; Duker, Jay S; Fujimoto, James G

    2013-12-20

    We developed an ultrahigh speed, handheld swept source optical coherence tomography (SS-OCT) ophthalmic instrument using a 2D MEMS mirror. A vertical cavity surface-emitting laser (VCSEL) operating at 1060 nm center wavelength yielded a 350 kHz axial scan rate and 10 µm axial resolution in tissue. The long coherence length of the VCSEL enabled a 3.08 mm imaging range with minimal sensitivity roll-off in tissue. Two different designs with identical optical components were tested to evaluate handheld OCT ergonomics. An iris camera aided in alignment of the OCT beam through the pupil and a manual fixation light selected the imaging region on the retina. Volumetric and high definition scans were obtained from 5 undilated normal subjects. Volumetric OCT data was acquired by scanning the 2.4 mm diameter 2D MEMS mirror sinusoidally in the fast direction and linearly in the orthogonal slow direction. A second volumetric sinusoidal scan was obtained in the orthogonal direction and the two volumes were processed with a software algorithm to generate a merged motion-corrected volume. Motion-corrected standard 6 x 6 mm(2) and wide field 10 x 10 mm(2) volumetric OCT data were generated using two volumetric scans, each obtained in 1.4 seconds. High definition 10 mm and 6 mm B-scans were obtained by averaging and registering 25 B-scans obtained over the same position in 0.57 seconds. One of the advantages of volumetric OCT data is the generation of en face OCT images with arbitrary cross sectional B-scans registered to fundus features. This technology should enable screening applications to identify early retinal disease, before irreversible vision impairment or loss occurs. Handheld OCT technology also promises to enable applications in a wide range of settings outside of the traditional ophthalmology or optometry clinics including pediatrics, intraoperative, primary care, developing countries, and military medicine. PMID:24466495

  15. Evaluation of the Perkins handheld applanation tonometer in horses and cattle.

    Science.gov (United States)

    Andrade, Silvia Franco; Kupper, Daniel Silva; Pinho, Luiz Fernando Rodrigues; Franco, Elizabeth Cunha; Prataviera, Marcus Vinícius Felix Fabri; Duarte, Rodrigo Rolim; Junqueira, José Ricardo Cecílio

    2011-06-01

    The objective of this study was to evaluate and validate the accuracy of the Perkins handheld applanation tonometer for measuring intraocular pressure (IOP) in horses and cattle. Both eyes of 10 adult horses and cattle were evaluated in a postmortem study. The eyes from 10 clinically normal adult horses and cattle were also examined after bilateral auriculopalpebral nerve block and topical anesthesia for an in vivo study. IOP was measured postmortem using direct manometry (measured with an aneroid manometer) and tonometry (measured with a Perkins handheld applanation tonometer). The correlation coefficients (r(2)) for the data from the postmortem manometry and Perkins tonometer study were 0.866 for horses and 0.864 for cattle. In the in vivo study, IOP in horses was 25.1 ± 2.9 mmHg (range 19.0~30.0 mmHg) as measured by manometry and 23.4 ± 3.2 mmHg (range 18.6~28.4 mmHg) according to tonometry. In cattle, IOP was found to be 19.7 ± 1.2 mmHg (range 18.0~22.0 mmHg) by manometry and 18.8 ± 1.7 mmHg (range 15.9~20.8 mmHg) by tonometry. There was a strong correlation between the IOP values obtained by direct ocular manometry and the tonometer in both horses and cattle. Our results demonstrate that the Perkins handheld tonometer could be an additional tool for accurately measuring IOP in equine and bovine eyes.

  16. A data-driven design evaluation tool for handheld device soft keyboards.

    Directory of Open Access Journals (Sweden)

    Matthieu B Trudeau

    Full Text Available Thumb interaction is a primary technique used to operate small handheld devices such as smartphones. Despite the different techniques involved in operating a handheld device compared to a personal computer, the keyboard layouts for both devices are similar. A handheld device keyboard that considers the physical capabilities of the thumb may improve user experience. We developed and applied a design evaluation tool for different geometries of the QWERTY keyboard using a performance evaluation model. The model utilizes previously collected data on thumb motor performance and posture for different tap locations and thumb movement directions. We calculated a performance index (PITOT, 0 is worst and 2 is best for 663 designs consisting in different combinations of three variables: the keyboard's radius of curvature (R (mm, orientation (O (°, and vertical location on the screen (L. The current standard keyboard performed poorly (PITOT = 0.28 compared to other designs considered. Keyboard location (L contributed to the greatest variability in performance out of the three design variables, suggesting that designers should modify this variable first. Performance was greatest for designs in the middle keyboard location. In addition, having a slightly upward curve (R = -20 mm and orientated perpendicular to the thumb's long axis (O = -20° improved performance to PITOT = 1.97. Poorest performances were associated with placement of the keyboard's spacebar in the bottom right corner of the screen (e.g., the worst was for R = 20 mm, O = 40°, L =  Bottom (PITOT = 0.09. While this evaluation tool can be used in the design process as an ergonomic reference to promote user motor performance, other design variables such as visual access and usability still remain unexplored.

  17. Methodology for Evaluating a Novel Education Technology: A Case Study of Handheld Video Games in Chile

    Science.gov (United States)

    Margolis, Jesse L.; Nussbaum, Miguel; Rodriguez, Patricio; Rosas, Ricardo

    2006-01-01

    Many school systems, in both the developed and developing world, are implementing educational technology to assist in student learning. However, there is no clear consensus on how to evaluate these new technologies. This paper proposes a comprehensive methodology for estimating the value of a new educational technology in three steps: benefit…

  18. Measuring earthquake periodicity of the Sparta fault with a handheld XRF

    Science.gov (United States)

    Fritzon, R.; Stroeven, A. P.; Skelton, A.; Goodfellow, B. W.; Caffee, M. W.

    2013-12-01

    Predicting earthquakes would help immensely in saving human lives and protecting economic interest. However a reliable method has not yet been found. When making risk assessments scientists still rely on reconstruction of earthquake periodicity. Finding a fast and cheap method to determine such periodicity is therefore of much interest. Benedetti et al. (2002, Geophysical Research Letters, VOL. 29, NO. 8, 1246) used 36Cl exposure dating to determine the earthquake periodicity on the limestone surfaces of the Sparta normal fault, southern Greece. Since the analysis for cosmic ray exposure dating is costly Carcaillet et al. (2008, Earth and Planetary Science Letters 271, 145-158) instead used geochemical analyses to identify weathering patterns on the fault scarp in order to count the number and magnitude of slips. Both of these methods requires drilling or cutting of bedrock for sampling which is both complicated and time consuming since the faults are step and exposed. A handheld XRF device can instantly determine the geochemistry of the rock surface. This method requires no drilling and it is possible to analyse the results in field at the fault scarp. Using a handheld XRF to determine weathering patterns would still require exposure dating to yield earthquake periodicity, but the number of sampling points could be highly reduced since it would be possible to pin-point the sample locations. In our study we have analysed 200 sample points with a Olympus Innov-X DeltaTM handheld XRF from a 6.8m high section of the limestone normal fault scarp surface at Sparta. Our profile is taken next to the Benedetti et al. (2002) sampling site. Our study shows significant variations of Yttrium concentration along the profile with a strong peak just below the present soil cover at the base of the section and then repeated peaks up along the transect on the subaerially exposed scarp surface. These Yttrium concentrations taken from the surface are correlated to Yttrium

  19. Clinical assessment of hip strength using a hand-held dynamometer is reliable

    DEFF Research Database (Denmark)

    Thorborg, K; Petersen, J; Magnusson, S P;

    2010-01-01

    rotation (ER), internal rotation (IR), flexion (FLEX) and extension (EXT) using a hand-held dynamometer. Nine subjects (five males, four females), physically active for at least 2.5 h a week, were included. Twelve standardized isometric strength tests were performed twice with a 1-week interval in between...... tests. No systematic differences were present. Standardized strength assessment procedures of hip ABD, ER, IR, FLEX, with test-retest measurement variation below 5%, hip ADD below 6% and hip EXT below 8%, make it possible to determine even small changes in hip strength at the individual level....

  20. An Ungrounded Hand-Held Surgical Device Incorporating Active Constraints with Force-Feedback

    OpenAIRE

    Payne, Christopher J; Kwok, Ka-Wai; Yang, Guang-Zhong

    2013-01-01

    This paper presents an ungrounded, hand-held surgical device that incorporates active constraints and force-feedback. Optical tracking of the device and embedded actuation allow for real-time motion compensation of a surgical tool as an active constraint is encountered. The active constraints can be made soft, so that the surgical tool tip motion is scaled, or rigid, so as to altogether prevent the penetration of the active constraint. Force-feedback is also provided to the operator so as to ...

  1. Hand-held electronic teaching-aid for demonstrating MRI concepts.

    Science.gov (United States)

    Malko, J A; Nelson, R C

    1989-11-01

    We describe a hand-held electronic teaching-aid for magnetic resonance imaging (MRI), which can be used to demonstrate the dependence of signal intensity on changing pulse sequence parameters (TR and TE), the dependence of intensity on changing tissue parameters (T1 and T2), and the ideas of "T1-weighting" and "T2-weighting" as they relate to image contrast. The device was specifically designed to be easy to use and readily accessible to residents-in-training and MR neophytes. PMID:2807811

  2. A handheld support system to facilitate stereological measurements and mapping of branching structures

    DEFF Research Database (Denmark)

    Gardi, Jonathan Eyal; Wulfsohn, Dvoralai; Nyengaard, Jens Randel

    2007-01-01

    time, and saving data in formats suited for further analysis in other software, e.g. a spreadsheet. The system can be applied in a wide range of applications, from biomedical science to agriculture and horticulture. It can be applied for sampling nested generations of lung bronchioles and renal...... specifications, software and Graphical User Interface (GUI) development, functionality and application of the handheld system using four examples: (1) sampling monkey lung bronchioles for estimation of diameter and wall thickness (2) sampling rat kidney for estimating number of arteries and arterioles...

  3. ROPtool analysis of images acquired using a noncontact handheld fundus camera (Pictor)--a pilot study.

    Science.gov (United States)

    Vickers, Laura A; Freedman, Sharon F; Wallace, David K; Prakalapakorn, S Grace

    2015-12-01

    The presence of plus disease is the primary indication for treatment of retinopathy of prematurity (ROP), but its diagnosis is subjective and prone to error. ROPtool is a semiautomated computer program that quantifies vascular tortuosity and dilation. Pictor is an FDA-approved, noncontact, handheld digital fundus camera. This pilot study evaluated ROPtool's ability to analyze high-quality Pictor images of premature infants and its accuracy in diagnosing plus disease compared to clinical examination. In our small sample of images, ROPtool could trace and identify the presence of plus disease with high accuracy. PMID:26691046

  4. A hand-held sensor for analyses of local distributions of magnetic fields and losses

    CERN Document Server

    Krismanic, G; Baumgartinger, N

    2000-01-01

    The paper describes a novel sensor for non-destructive analyses of local field and loss distributions in laminated soft magnetic cores, such as transformer cores. It was designed for rapid information on comparative local degrees of inhomogeneity, e.g., for the estimation of local building factors. Similar to a magnifying glass with handle, the compact hand-held sensor contains extremely sharp needle electrodes for the detection of the induction vector B as well as double-field coils for the vector H. Losses P are derived from the Poynting law. Applied to inner -- or also outer -- core regions, the sensor yields instantaneous computer displays of local H, B, and P.

  5. Implementation of synthetic aperture imaging on a hand-held device

    DEFF Research Database (Denmark)

    Hemmsen, Martin Christian; Kjeldsen, Thomas; Larsen, Lee;

    2014-01-01

    implementation demonstrates that SASB can be executed in-time for real-time ultrasound imaging. The wireless communication between probe and processing device satisfies the required bandwidth for real-time data transfer with current 802.11ac technology. The implementation is evaluated using four different hand......This paper presents several implementations of Syn- thetic Aperture Sequential Beamforming (SASB) on commer- cially available hand-held devices. The implementations include real-time wireless reception of ultrasound radio frequency sig- nals and GPU processing for B-mode imaging. The proposed...

  6. Estimating nuclear fuel cycle cost using a hand-held programmable calculator

    International Nuclear Information System (INIS)

    A program has been developed by which average fuel cycle cost for a single reload batch can be calculated in a few minutes using a hand-held programmable calculator. The program described uses a modification of the so-called seven-page method, wherein the method was expanded to calculate mixed oxide fuel cycle cost, and to calculate the cost of off-site spent fuel storage prior to reprocessing or final spent fuel disposal; a fuel fabrication loss factor was added for plutonium and/or uranium fuel fabrication; and a single payment was used for fuel fabrication instead of several monthly payments

  7. Hand-Held Flyback Driven Coaxial Dielectric Barrier Discharge: Development and Characterization

    OpenAIRE

    Law, Victor J; Milosavljevic, Vladimir; O’Connor, Neil; Lalor, James F; Daniels, Steven

    2008-01-01

    The development of a handheld single and triple chamber atmospheric pressure coaxial dielectric barrier discharge driven by Flyback circuitry for helium and argon discharges is described. The Flyback uses external metal-oxide-semiconductor field-effect transistor power switching technology and the transformer operates in the continuous current mode to convert a continuous dc power of 10–33 W to generate a 1.2–1.6 kV 3.5 μs pulse. An argon discharge breakdown voltage of ∼768 V is measured. Wit...

  8. The Case of the Druid Dracula

    Science.gov (United States)

    Brickman, Peggy

    2006-01-01

    This article describes how case studies have been successfully implemented in an introductory biology course of 300+ students using available technologies ranging from WebCT, used to assign students to permanent small groups (as well as assign groups to regions of a large lecture hall), to hand-held response systems (aka "clickers"), which…

  9. Physical Science Connected Classrooms: Case Studies

    Science.gov (United States)

    Irving, Karen; Sanalan, Vehbi; Shirley, Melissa

    2009-01-01

    Case-study descriptions of secondary and middle school classrooms in diverse contexts provide examples of how teachers implement connected classroom technology to facilitate formative assessment in science instruction. Connected classroom technology refers to a networked system of handheld devices designed for classroom use. Teachers were…

  10. Handheld non-contact evaluation of fastener flushness and countersink surface profiles using optical coherence tomography

    Science.gov (United States)

    Wang, James H.; Wang, Michael R.

    2016-07-01

    We report the use of spectral domain optical coherence tomography (SD-OCT) for non-contact optical evaluation of fastener flushness and countersink surface profile. Using a handheld galvanometer scanner of only 0.5 lb in weight the SD-OCT can perform line scan surface profile measurement of fastener and countersink without demanding accurate scan center alignment. It demonstrates fast measurement of fastener flushness, radius, slant angle, as well as countersink edge radius and surface angle within 90 ms suitable for handheld operation. With the use of a broadband light source at 840 nm center wavelength and 45 nm spectral bandwidth and a lens of 60 mm focal length, the low coherence interferometry based SD-OCT measurement offers axial depth resolution of 8.5 μm, lateral resolution of 19 μm, and measurement depth of 3.65 mm in the air. Multi-line scans can yield 3D surface profiles of fastener and countersink.

  11. A Handheld Open-Field Infant Keratometer (An American Ophthalmological Society Thesis)

    Science.gov (United States)

    Miller, Joseph M.

    2010-01-01

    Purpose: To design and evaluate a new infant keratometer that incorporates an unobstructed view of the infant with both eyes (open-field design). Methods: The design of the open-field infant keratometer is presented, and details of its construction are given. The design incorporates a single-ring keratoscope for measurement of corneal astigmatism over a 4-mm region of the cornea and includes a rectangular grid target concentric within the ring to allow for the study of higher-order aberrations of the eye. In order to calibrate the lens and imaging system, a novel telecentric test object was constructed and used. The system was bench calibrated against steel ball bearings of known dimensions and evaluated for accuracy while being used in handheld mode in a group of 16 adult cooperative subjects. It was then evaluated for testability in a group of 10 infants and toddlers. Results: Results indicate that while the device achieved the goal of creating an open-field instrument containing a single-ring keratoscope with a concentric grid array for the study of higher-order aberrations, additional work is required to establish better control of the vertex distance. Conclusion: The handheld open-field infant keratometer demonstrates testability suitable for the study of infant corneal astigmatism. Use of collimated light sources in future iterations of the design must be incorporated in order to achieve the accuracy required for clinical investigation. PMID:21212850

  12. Estimation of antioxidant components of tomato using VIS-NIR reflectance data by handheld portable spectrometer

    Science.gov (United States)

    Szuvandzsiev, Péter; Helyes, Lajos; Lugasi, Andrea; Szántó, Csongor; Baranowski, Piotr; Pék, Zoltán

    2014-10-01

    Processing tomato production represents an important part of the total production of processed vegetables in the world. The quality characteristics of processing tomato, important for the food industry, are soluble solids content and antioxidant content (such as lycopene and polyphenols) of the fruit. Analytical quantification of these components is destructive, time and labour consuming. That is why researchers try to develop a non-destructive and rapid method to assess those quality parameters. The present study reports the suitability of a portable handheld visible near infrared spectrometer to predict soluble solids, lycopene and polyphenol content of tomato fruit puree. Spectral ranges of 500-1000 nm were directly acquired on fruit puree of five different tomato varieties using a FieldSpec HandHeld 2™ Portable Spectroradiometer. Immediately after spectral measurement, each fruit sample was analysed to determine soluble solids, lycopene and polyphenol content. Partial least square regressions were carried out to create models of prediction between spectral data and the values obtained from the analytical results. The accuracy of the predictions was analysed according to the coefficient of determination value (R2), the root mean square error of calibration/ cross-validation.

  13. Design and testing of prototype handheld scanning probes for optical coherence tomography.

    Science.gov (United States)

    Demian, Dorin; Duma, Virgil-Florin; Sinescu, Cosmin; Negrutiu, Meda Lavinia; Cernat, Ramona; Topala, Florin Ionel; Hutiu, Gheorghe; Bradu, Adrian; Podoleanu, Adrian Gh

    2014-08-01

    Three simple and low-cost configurations of handheld scanning probes for optical coherence tomography have been developed. Their design and testing for dentistry applications are presented. The first two configurations were built exclusively from available off-the-shelf optomechanical components, which, to the best of our knowledge, are the first designs of this type. The third configuration includes these components in an optimized and ergonomic probe. All the designs are presented in detail to allow for their duplication in any laboratory with a minimum effort, for applications that range from educational to high-end clinical investigations. Requirements that have to be fulfilled to achieve configurations which are reliable, ergonomic-for clinical environments, and easy to build are presented. While a range of applications is possible for the prototypes developed, in this study the handheld probes are tested ex vivo with a spectral domain optical coherence tomography system built in-house, for dental constructs. A previous testing with a swept source optical coherence tomography system has also been performed both in vivo and ex vivo for ear, nose, and throat-in a medical environment. The applications use the capability of optical coherence tomography to achieve real-time, high-resolution, non-contact, and non-destructive interferometric investigations with micrometer resolutions and millimeter penetration depth inside the sample. In this study, testing the quality of the material of one of the most used types of dental prosthesis, metalo-ceramic is thus demonstrated. PMID:25107512

  14. Evolving Consumption Patterns of Various Information Media via Handheld Mobile Devices

    Directory of Open Access Journals (Sweden)

    Nitza Geri

    2015-06-01

    Full Text Available This study examines diverse information media in order to identify those formats that are most suitable for consumption via handheld mobile devices, namely, smartphones and tablets. The preferences of the users are measured objectively by analyzing actual data of their relative use of handheld mobile devices and personal computing (PC desktop devices, including laptops and notebooks, for consumption of information presented in various formats. Our findings are based on Google Analytics pageview data of five course Websites during a period of three semesters, by 11,557 undergraduate students. M-learning contexts were chosen, since in a learning environment the interests of information providers (i.e., the instructors are in accord with those of the information consumers (i.e., the students, whereas in commercial settings there may be conflicts of interests. Our findings demonstrate that although about 90% of the pageviews were via PC devices, the rate of smartphone use for consuming learning content in diverse information media is gradually increasing as time goes by, whereas the rate of tablet use for these purposes is stagnant. The most promising direction for smartphone development, emanating from the findings, is online video content.

  15. Standard guide to In-Plant performance evaluation of Hand-Held SNM monitors

    CERN Document Server

    American Society for Testing and Materials. Philadelphia

    1999-01-01

    1.1 This guide is one of a series on the application and evaluation of special nuclear material (SNM) monitors. Other guides in the series are listed in Section 2, and the relationship of in-plant performance evaluation to other procedures described in the series is illustrated in Fig. 1. Hand-held SNM monitors are described in of Guide C1112, and performance criteria illustrating their capabilities can be found in Appendix X1. 1.2 The purpose of this guide to in-plant performance evaluation is to provide a comparatively rapid procedure to verify that a hand-held SNM monitor performs as expected for detecting SNM or alternative test sources or to disclose the need for repair. The procedure can be used as a routine operational evaluation or it can be used to verify performance after a monitor is calibrated. 1.3 In-plant performance evaluations are more comprehensive than daily functional tests. They take place less often, at intervals ranging from weekly to once every three months, and derive their result fr...

  16. Handheld Thermoacoustic Scanning System Based on a Linear-array Transducer.

    Science.gov (United States)

    Ji, Zhong; Ding, Wenzheng; Ye, Fanghao; Lou, Cunguang

    2016-07-01

    To receive the information necessary for imaging, traditional microwave-induced thermoacoustic imaging systems (MITISs) use a type of circular-scanning mode using single or arc detectors. However, the use of MITISs for body scanning is complicated by restrictions in space and imaging time. A linear-array detector, the most widely used transducer in medical ultrasound imaging systems for body scanning, is a possible alternative to MITISs for scanning biological tissues, such as from the breast or limbs. In this paper, a handheld MITIS, based on a linear-array detector and a multiple data acquisition system, is described, and the capacity of the system is explored experimentally. First, the vertical and lateral resolution of the system is discussed. Next, real-time imaging of a moving object, obtained with an image capture rate of 20 frame/s, is described. Finally, a phantom experiment is detailed, investigating the overall imaging capability. The results show that this system achieves rapid scanning with a large field of view. The system has the obvious advantages of being handheld, not using coupled fluids, and achieving real-time imaging with a large field of view, which make this MITIS more suitable for clinical applications.

  17. Advanced sampling techniques for hand-held FT-IR instrumentation

    Science.gov (United States)

    Arnó, Josep; Frunzi, Michael; Weber, Chris; Levy, Dustin

    2013-05-01

    FT-IR spectroscopy is the technology of choice to identify solid and liquid phase unknown samples. The challenging ConOps in emergency response and military field applications require a significant redesign of the stationary FT-IR bench-top instruments typically used in laboratories. Specifically, field portable units require high levels of resistance against mechanical shock and chemical attack, ease of use in restrictive gear, extreme reliability, quick and easy interpretation of results, and reduced size. In the last 20 years, FT-IR instruments have been re-engineered to fit in small suitcases for field portable use and recently further miniaturized for handheld operation. This article introduces the HazMatID™ Elite, a FT-IR instrument designed to balance the portability advantages of a handheld device with the performance challenges associated with miniaturization. In this paper, special focus will be given to the HazMatID Elite's sampling interfaces optimized to collect and interrogate different types of samples: accumulated material using the on-board ATR press, dispersed powders using the ClearSampler™ tool, and the touch-to-sample sensor for direct liquid sampling. The application of the novel sample swipe accessory (ClearSampler) to collect material from surfaces will be discussed in some detail. The accessory was tested and evaluated for the detection of explosive residues before and after detonation. Experimental results derived from these investigations will be described in an effort to outline the advantages of this technology over existing sampling methods.

  18. DNA aptamer beacon assay for C-telopeptide and handheld fluorometer to monitor bone resorption.

    Science.gov (United States)

    Bruno, John Gordon; Carrillo, Maria P; Phillips, Taylor; Hanson, Douglas; Bohmann, Jonathan A

    2011-09-01

    A novel DNA aptamer beacon is described for quantification of a 26-amino acid C-telopeptide (CTx) of human type I bone collagen. One aptamer sequence and its reverse complement dominated the aptamer pool (31.6% of sequenced clones). Secondary structures of these aptamers were examined for potential binding pockets. Three-dimensional computer models which analyzed docking topologies and binding energies were in agreement with empirical fluorescence experiments used to select one candidate loop for beacon assay development. All loop structures from the aptamer finalists were end-labeled with TYE 665 and Iowa Black quencher for comparison of beacon fluorescence levels as a function of CTx concentration. The optimal beacon, designated CTx 2R-2h yielded a low ng/ml limit of detection using a commercially available handheld fluorometer. The CTx aptamer beacon bound full-length 26-amino acid CTx peptide, but not a shorter 8-amino acid segment of CTx peptide which is a common target for commercial CTx ELISA kits. The prototype assay was shown to detect CTx peptide from human urine after creatinine and urea were removed by size-exclusion chromatography to prevent nonspecific denaturing of the aptamer beacon. This work demonstrates the potential of aptamer beacons to be utilized for rapid and sensitive bone health monitoring in a handheld or point-of-care format.

  19. Design and testing of prototype handheld scanning probes for optical coherence tomography.

    Science.gov (United States)

    Demian, Dorin; Duma, Virgil-Florin; Sinescu, Cosmin; Negrutiu, Meda Lavinia; Cernat, Ramona; Topala, Florin Ionel; Hutiu, Gheorghe; Bradu, Adrian; Podoleanu, Adrian Gh

    2014-08-01

    Three simple and low-cost configurations of handheld scanning probes for optical coherence tomography have been developed. Their design and testing for dentistry applications are presented. The first two configurations were built exclusively from available off-the-shelf optomechanical components, which, to the best of our knowledge, are the first designs of this type. The third configuration includes these components in an optimized and ergonomic probe. All the designs are presented in detail to allow for their duplication in any laboratory with a minimum effort, for applications that range from educational to high-end clinical investigations. Requirements that have to be fulfilled to achieve configurations which are reliable, ergonomic-for clinical environments, and easy to build are presented. While a range of applications is possible for the prototypes developed, in this study the handheld probes are tested ex vivo with a spectral domain optical coherence tomography system built in-house, for dental constructs. A previous testing with a swept source optical coherence tomography system has also been performed both in vivo and ex vivo for ear, nose, and throat-in a medical environment. The applications use the capability of optical coherence tomography to achieve real-time, high-resolution, non-contact, and non-destructive interferometric investigations with micrometer resolutions and millimeter penetration depth inside the sample. In this study, testing the quality of the material of one of the most used types of dental prosthesis, metalo-ceramic is thus demonstrated.

  20. Rich internet application system for patient-centric healthcare data management using handheld devices.

    Science.gov (United States)

    Constantinescu, L; Pradana, R; Kim, J; Gong, P; Fulham, Michael; Feng, D

    2009-01-01

    Rich Internet Applications (RIAs) are an emerging software platform that blurs the line between web service and native application, and is a powerful tool for handheld device deployment. By democratizing health data management and widening its availability, this software platform has the potential to revolutionize telemedicine, clinical practice, medical education and information distribution, particularly in rural areas, and to make patient-centric medical computing a reality. In this paper, we propose a telemedicine application that leverages the ability of a mobile RIA platform to transcode, organise and present textual and multimedia data, which are sourced from medical database software. We adopted a web-based approach to communicate, in real-time, with an established hospital information system via a custom RIA. The proposed solution allows communication between handheld devices and a hospital information system for media streaming with support for real-time encryption, on any RIA enabled platform. We demonstrate our prototype's ability to securely and rapidly access, without installation requirements, medical data ranging from simple textual records to multi-slice PET-CT images and maximum intensity (MIP) projections. PMID:19963888

  1. Quality-Based Backlight Optimization for Video Playback on Handheld Devices

    Directory of Open Access Journals (Sweden)

    Liang Cheng

    2007-01-01

    Full Text Available For a typical handheld device, the backlight accounts for a significant percentage of the total energy consumption (e.g., around 30% for a Compaq iPAQ 3650. Substantial energy savings can be achieved by dynamically adapting backlight intensity levels on such low-power portable devices. In this paper, we analyze the characteristics of video streaming services and propose a cross-layer optimization scheme called quality adapted backlight scaling (QABS to achieve backlight energy savings for video playback applications on handheld devices. Specifically, we present a fast algorithm to optimize backlight dimming while keeping the degradation in image quality to a minimum so that the overall service quality is close to a specified threshold. Additionally, we propose two effective techniques to prevent frequent backlight switching, which negatively affects user perception of video. Our initial experimental results indicate that the energy used for backlight is significantly reduced, while the desired quality is satisfied. The proposed algorithms can be realized in real time.

  2. Overview of passive and active vision techniques for hand-held 3D data acquistion

    Science.gov (United States)

    Mada, Sreenivasa K.; Smith, Melvyn L.; Smith, Lyndon N.; Midha, Prema S.

    2003-03-01

    The digitization of the 3D shape of real objects is a rapidly expanding discipline, with a wide variety of applications, including shape acquisition, inspection, reverse engineering, gauging and robot navigation. Developments in computer product design techniques, automated production, and the need for close manufacturing tolerances will be facts of life for the foreseeable future. A growing need exists for fast, accurate, portable, non-contact 3D sensors. However, in order for 3D scanning to become more commonplace, new methods are needed for easily, quickly and robustly acquiring accurate full geometric models of complex objects using low cost technology. In this paper, a brief survey is presented of current scanning technologies available for acquiring range data. An overview is provided of current 3D-shape acquisition using both active and passive vision techniques. Each technique is explained in terms of its configuration, principle of operation, and the inherent advantages and limitations. A separate section then focuses on the implications of scannerless scanning for hand held technology, after which the current status of 3D acquisition using handheld technology, together with related issues concerning implementation, is considered more fully. Finally, conclusions for further developments in handheld devices are discussed. This paper may be of particular benefit to new comers in this field.

  3. Handheld Reflective Foil Emissometer with 0.007 Absolute Accuracy at 0.05

    Science.gov (United States)

    van der Ham, E. W. M.; Ballico, M. J.

    2014-07-01

    The development and performance of a handheld emissometer for the measurement of the emissivity of highly reflective metallic foils used for the insulation of domestic and commercial buildings are described. Reflective roofing insulation based on a thin coating of metal on a more robust substrate is very widely used in hotter climates to reduce the radiant heat transfer between the ceiling and roof in commercial and residential buildings. The required normal emissivity of these foils is generally below 0.05, so stray reflected ambient infrared radiation (IR) makes traditional reflectance-based measurements of emissivity very difficult to achieve with the required accuracy. Many manufacturers apply additional coatings onto the metallic foil to reduce visible glare during installation on a roof, and to provide protection to the thin reflective layer; however, this layer can also substantially increase the IR emissivity. The system as developed at the National Measurement Institute, Australia (NMIA) is based on the principle of measurement of the modulation in thermal infrared radiation, as the sample is thermally modulated by hot and cold air streams. A commercial infrared to band radiation thermometer with a highly specialized stray and reflected radiation shroud attachment is used as the detector system, allowing for convenient handheld field measurements. The performance and accuracy of the system have been compared with NMIA's reference emissometer systems for a number of typical material samples, demonstrating its capability to measure the absolute thermal emissivity of these very highly reflective foils with an uncertainty of better than.

  4. Algorithms for a hand-held miniature x-ray fluorescence analytical instrument

    Energy Technology Data Exchange (ETDEWEB)

    Elam, W.T.; Newman, D.; Ziemba, F. [and others

    1998-12-31

    The purpose of this joint program was to provide technical assistance with the development of a Miniature X-ray Fluorescence (XRF) Analytical Instrument. This new XRF instrument is designed to overcome the weaknesses of spectrometers commercially available at the present time. Currently available XRF spectrometers (for a complete list see reference 1) convert spectral information to sample composition using the influence coefficients technique or the fundamental parameters method. They require either a standard sample with composition relatively close to the unknown or a detailed knowledge of the sample matrix. They also require a highly-trained operator and the results often depend on the capabilities of the operator. In addition, almost all existing field-portable, hand-held instruments use radioactive sources for excitation. Regulatory limits on such sources restrict them such that they can only provide relatively weak excitation. This limits all current hand-held XRF instruments to poor detection limits and/or long data collection times, in addition to the licensing requirements and disposal problems for radioactive sources. The new XRF instrument was developed jointly by Quantrad Sensor, Inc., the Naval Research Laboratory (NRL), and the Department of Energy (DOE). This report describes the analysis algorithms developed by NRL for the new instrument and the software which embodies them.

  5. The Case of the Druid Dracula: A Directed "Clicker" Case Study on DNA Fingerprinting

    Science.gov (United States)

    Brickman, Peggy

    2006-01-01

    This article describes how case studies have been successfully implemented in an introductory biology course of 300+ students using available technologies ranging from WebCT, used to assign students to permanent small groups (as well as assign groups to regions of a large lecture hall), to hand-held response systems (aka "clickers"), which…

  6. Linear Text vs. Non-Linear Hypertext in Handheld Computers: Effects on Declarative and Structural Knowledge, and Learner Motivation

    Science.gov (United States)

    Son, Chanhee; Park, Sanghoon; Kim, Minjeong

    2011-01-01

    This study compared linear text-based and non-linear hypertext-based instruction in a handheld computer regarding effects on two different levels of knowledge (declarative and structural knowledge) and learner motivation. Forty four participants were randomly assigned to one of three experimental conditions: linear text, hierarchical hypertext,…

  7. The Pixel Paradox and Transition-Metal Spectroscopy: One of Many Uses of the Handheld Digital Microscope in Chemical Demonstrations

    Science.gov (United States)

    Vitz, Ed

    2010-01-01

    A handheld digital microscope (HDM) interfaced to a computer with a presentation projector is used to project an out-of-focus yellow patch on the screen, then the patch is brought into focus to show that, paradoxically, there are red and green but no yellow pixels. Chromaticity diagrams are used to discuss this observation and spectroscopic…

  8. ENGAGING SCIENCE STUDENTS WITH HANDHELD TECHNOLOGY AND APPLICATIONS BY RE-VISITING THE THAYER METHOD OF TEACHING AND LEARNING

    Directory of Open Access Journals (Sweden)

    Julia Paredes

    2011-12-01

    Full Text Available Organic chemistry instructors integrate handheld technology and applications into course lecture and lab to engage students with tools and techniques students use in the modern world. This technology and applications enable instructors to re-visit the Thayer Method of teaching and learning to create an updated method that works with 21st century students. The Thayer Method is based on the premise that students are willing and capable of making substantial preparation before coming to class and lab in order to maximize efficiency of student-instructor contact time. During this student preparation phase, we engage students with handheld technology and content applications including smart phone viewable course administrative materials; “flashcards” containing basic organic chemistry nomenclature, molecular structures, and chemical reactions; mini-lectures prepared using the Smart Board Airliner Interactive Tablet for upcoming class periods and laboratory technique videos demonstrating tasks they will perform as part of laboratory experimentation. Coupled with a student friendly course text, these handheld applications enable substantial student preparation before class and lab. The method, in conjunction with handheld technology and applications, has been used with positive results in our organic chemistry courses.

  9. Hip strength assessment using handheld dynamometry is subject to intertester bias when testers are of different sex and strength

    DEFF Research Database (Denmark)

    Thorborg, K; Bandholm, T; Schick, M;

    2013-01-01

    Handheld dynamometry (HHD) is a promising tool for obtaining reliable hip strength measurements in the clinical setting, but intertester reliability has been questioned, especially in situations where testers exhibit differences in upper-extremity muscle strength (male vs female). The purpose of ...

  10. Identifying paleoseismic information from limestone normal faults with a handheld XRF

    Science.gov (United States)

    Fritzon, Ruben; Stroeven, Arjen P.; Skelton, Alasdair; Goodfellow, Brad W.; Caffee, Marc W.

    2014-05-01

    Predicting earthquakes would help immensely in saving human lives and protecting economic interest but a reliable method has not yet been found. When making risk assessments scientists continue to rely on paleoseismic studies. Determining a fast and cheap proxy for paleoseismicity is therefore of much interest. Surface exposure dating is an emergent method for paleoseismic studies of active normal fault scarps in the Mediterranean region. This method gives crucial paleoearthquake information such as timing and vertical slip along the fault but the analysis of cosmogenic nuclides is costly and the sampling is both complicated and time consuming. In our study we employ an Olympus Innov-X DeltaTM handheld XRF to analyse the geochemistry of a scarp surface in order to determine the number and magnitude of slips along the fault. This method requires no drilling and it is possible to analyse the results at the fault scarp. Exposure dating is still required to yield the timeframe of the paleoearthquake record, but the number of sampling points may be significantly reduced since it would be possible to pin-point the sampling locations around suspected former soil horizons. We have analysed 200 sample points with the handheld XRF from a 6.8 m section of the limestone normal fault scarp surface close to Sparta, southern Greece. Our profile is taken next to the Benedetti et al.[Geophysical Research Letters, 29, 8 (2002)] sampling site. Our results show significant variations in Yttrium concentration along the profile with a strong peak just below the present soil cover at the base of the section and then repeated peaks up along the transect on the subaerially exposed scarp surface. These Yttrium concentrations at the surface are correlated with Yttrium concentrations in the rock determined from drill cores taken every 10 cm from the same profile. The preliminary dataset appears to indicate a good correlation between the Yttrium concentrations and the earthquake events

  11. Non-destructive Measurement of Calcium and Potassium in Apple and Pear Using Handheld X-ray Fluorescence.

    Science.gov (United States)

    Kalcsits, Lee A

    2016-01-01

    Calcium and potassium are essential for cell signaling, ion homeostasis and cell wall strength in plants. Unlike nutrients such as nitrogen and potassium, calcium is immobile in plants. Localized calcium deficiencies result in agricultural losses; particularly for fleshy horticultural crops in which elemental imbalances in fruit contribute to the development of physiological disorders such as bitter pit in apple and cork spot in pear. Currently, elemental analysis of plant tissue is destructive, time consuming and costly. This is a limitation for nutrition studies related to calcium in plants. Handheld portable x-ray fluorescence (XRF) can be used to non-destructively measure elemental concentrations. The main objective was to test if handheld XRF can be used for semi-quantitative calcium and potassium analysis of in-tact apple and pear. Semi-quantitative measurements for individual fruit were compared to results obtained from traditional lab analysis. Here, we observed significant correlations between handheld XRF measurements of calcium and potassium and concentrations determined using MP-AES lab analysis. Pearson correlation coefficients ranged from 0.73 and 0.97. Furthermore, measuring apple and pear using handheld XRF identified spatial variability in calcium and potassium concentrations on the surface of individual fruit. This variability may contribute to the development of localized nutritional imbalances. This highlights the importance of understanding spatial and temporal variability in elemental concentrations in plant tissue. Handheld XRF is a relatively high-throughput approach for measuring calcium and potassium in plant tissue. It can be used in conjunction with traditional lab analysis to better understand spatial and temporal patterns in calcium and potassium uptake and distribution within an organ, plant or across the landscape. PMID:27092160

  12. In vivo cellular-resolution retinal imaging in infants and children using an ultracompact handheld probe

    Science.gov (United States)

    Larocca, Francesco; Nankivil, Derek; Dubose, Theodore; Toth, Cynthia A.; Farsiu, Sina; Izatt, Joseph A.

    2016-09-01

    Enabled by adaptive optics, retinal photoreceptor cell imaging is changing our understanding of retinal structure and function, as well as the pathogenesis of numerous ocular diseases. To date, use of this technology has been limited to cooperative adult subjects due to the size, weight and inconvenience of the equipment, thus excluding study of retinal maturation during human development. Here, we report the design and operation of a handheld probe that can perform both scanning laser ophthalmoscopy and optical coherence tomography of the parafoveal photoreceptor structure in infants and children without the need for adaptive optics. The probe, featuring a compact optical design weighing only 94 g, was able to quantify packing densities of parafoveal cone photoreceptors and visualize cross-sectional photoreceptor substructure in children with ages ranging from 14 months to 12 years. The probe will benefit paediatric research by improving the understanding of retinal development, maldevelopment and early onset of disease during human growth.

  13. A handheld low temperature atmospheric pressure air plasma gun for nanomaterial synthesis in liquid phase

    International Nuclear Information System (INIS)

    A handheld low temperature atmospheric pressure air plasma gun based on a dielectric barrier structure with hollow electrodes was proposed. The portable plasma gun with an embedded mini air pump was driven by a 12 V direct voltage battery. The air plasma jet generated from the gun could be touched without a common shock hazard. Besides working in air, the plasma gun can also work in water. The diagnostic result of optical emission spectroscopy showed the difference in reactive species of air plasma jet between in air and in water. The plasma gun was excited in 20 ml chloroauric acid aqueous solution with a concentration of 1.214 mM. A significant amount of gold nanoparticles were synthesized after 2 min continuous discharge. The plasma gun with these unique features is applicable in plasma medicine, etching, and s-nthesis of nanomaterials

  14. A handheld low temperature atmospheric pressure air plasma gun for nanomaterial synthesis in liquid phase

    Science.gov (United States)

    Yu, Shuang; Wang, Kaile; Zuo, Shasha; Liu, Jiahui; Zhang, Jue; Fang, Jing

    2015-10-01

    A handheld low temperature atmospheric pressure air plasma gun based on a dielectric barrier structure with hollow electrodes was proposed. The portable plasma gun with an embedded mini air pump was driven by a 12 V direct voltage battery. The air plasma jet generated from the gun could be touched without a common shock hazard. Besides working in air, the plasma gun can also work in water. The diagnostic result of optical emission spectroscopy showed the difference in reactive species of air plasma jet between in air and in water. The plasma gun was excited in 20 ml chloroauric acid aqueous solution with a concentration of 1.214 mM. A significant amount of gold nanoparticles were synthesized after 2 min continuous discharge. The plasma gun with these unique features is applicable in plasma medicine, etching, and s-nthesis of nanomaterials.

  15. Impact of an external radiation field on handheld XRF measurements for nuclear forensics applications

    Energy Technology Data Exchange (ETDEWEB)

    Steeb, Jennifer L. [Argonne National Lab. (ANL), Argonne, IL (United States); Mertz, Carol J. [Argonne National Lab. (ANL), Argonne, IL (United States); Finck, Martha R. [Idaho National Lab. (INL), Idaho Falls, ID (United States); Engelstad, Gary [Idaho National Lab. (INL), Idaho Falls, ID (United States); Carney, Kevin P. [Idaho National Lab. (INL), Idaho Falls, ID (United States); Chamberlain, David B. [Argonne National Lab. (ANL), Argonne, IL (United States)

    2015-03-28

    X-ray fluorescence (XRF) is an attractive technique for nuclear forensics applications. We evaluated a handheld, portable XRF device by applying an external radiation field (10 mR/h to 17 R/h) using two types of radiography sources: a 60Co radiography camera to observe effects from high-energy gamma emissions and an 192Ir radiography camera to observe effects from several low-energy gamma (0.604, 0.468, and 0.317 MeV) and decay daughter x-ray emissions. External radiation tests proved that radiation, in general, has a significant effect on the dead time or background at dose rates over 1 R/hr for both the 192Ir and 60Co sources.

  16. Textbooks on tap: using electronic books housed in handheld devices in nursing clinical courses.

    Science.gov (United States)

    Williams, Margaret G; Dittmer, Arlis

    2009-01-01

    Changing technology is creating new ways to approach nursing education and practice. Beginning in 2003, using a quasi-experimental design, this project introduced personal digital assistants (PDAs) as a clinical tool to five experimental and control groups of students and faculty. The handheld device, or PDA, was loaded with e-books for clinical practice. Differences in learning styles and preferences emerged during the different phases of the study. Students were quickly able to master the technology and use the device effectively, reporting that they liked the concise nature of the information obtained. No students expressed dissatisfaction or regret at being in the experimental group. Results and implications for clinical practice, education, and library resources are discussed. PMID:19753854

  17. A review of the use of handheld computers in medical nutrition.

    Science.gov (United States)

    Holubar, Stefan; Harvey-Banchik, Lillian

    2007-08-01

    Handheld computers, or personal digital assistants (PDAs), have been used to assist clinicians in medical nutrition since the early 1980s. The term PDA was originally applied to programmable calculators; over time, the capabilities of these devices were expanded to allow for the use of more complicated programs such as databases, spreadsheets, and electronic books. Slowly, the device evolved into what is more commonly thought of as a PDA, that is, a device such as a PalmOS (PalmSource, Inc, Tokyo, Japan) or PocketPC (Microsoft, Redmond, WA) unit. We present a review of the literature about the use of PDAs in medical nutrition, followed by a discussion of the different types of PDAs and mobile technologies that are commercially available. This is followed by a discussion of software applications that are currently available for use by nutrition clinicians, focusing on freeware applications. Finally, future technologies and applications are discussed. PMID:17644697

  18. Clinical assessment of hip strength using a hand-held dynamometer is reliable

    DEFF Research Database (Denmark)

    Thorborg, K; Petersen, J; Magnusson, S P;

    2010-01-01

    Hip strength assessment plays an important role in the clinical examination of the hip and groin region. The primary aim of this study was to examine the absolute test-retest measurement variation concerning standardized strength assessments of hip abduction (ABD), adduction (ADD), external...... rotation (ER), internal rotation (IR), flexion (FLEX) and extension (EXT) using a hand-held dynamometer. Nine subjects (five males, four females), physically active for at least 2.5 h a week, were included. Twelve standardized isometric strength tests were performed twice with a 1-week interval in between...... by the same examiner. The test order was randomized to avoid systematic bias. Measurement variation between sessions was 3-12%. When the maximum value of four measurements was used, test-retest measurement variation was below 10% in 11 of the 12 individual hip strength tests and below 5% in five of the 12...

  19. An Enhanced Intelligent Handheld Instrument with Visual Servo Control for 2-DOF Hand Motion Error Compensation

    Directory of Open Access Journals (Sweden)

    Yan Naing Aye

    2013-10-01

    Full Text Available The intelligent handheld instrument, ITrem2, enhances manual positioning accuracy by cancelling erroneous hand movements and, at the same time, provides automatic micromanipulation functions. Visual data is acquired from a high speed monovision camera attached to the optical surgical microscope and acceleration measurements are acquired from the inertial measurement unit (IMU on board ITrem2. Tremor estimation and canceling is implemented via Band-limited Multiple Fourier Linear Combiner (BMFLC filter. The piezoelectric actuated micromanipulator in ITrem2 generates the 3D motion to compensate erroneous hand motion. Preliminary bench-top 2-DOF experiments have been conducted. The error motions simulated by a motion stage is reduced by 67% for multiple frequency oscillatory motions and 56.16% for pre-conditioned recorded physiological tremor.

  20. Handheld Diffuse Reflectance Spectral Imaging (DRSi) for in-vivo characterization of skin.

    Science.gov (United States)

    Bish, Sheldon F; Sharma, Manu; Wang, Youmin; Triesault, Nicholas J; Reichenberg, Jason S; Zhang, John X J; Tunnell, James W

    2014-02-01

    Diffuse reflectance spectroscopy provides a noninvasive means to measure optical and physiological properties of tissues. To expand on these measurements, we have developed a handheld diffuse reflectance spectral imaging (DRSi) system capable of acquiring wide field hyperspectral images of tissue. The image acquisition time was approximately 50 seconds for a 50x50 pixel image. A transport model was used to fit each spectra for reduced scattering coefficient, hemoglobin concentration and melanin concentration resulting in optical property maps. The system was validated across biologically relevant levels of reduced scattering (5.14% error) and absorption (8.34% error) using tissue simulating phantoms. DRSi optical property maps of a pigmented skin lesion were acquired in vivo. These trends in optical properties were consistent with previous observations using point probe devices. PMID:24575350

  1. A review of the use of handheld computers in medical nutrition.

    Science.gov (United States)

    Holubar, Stefan; Harvey-Banchik, Lillian

    2007-08-01

    Handheld computers, or personal digital assistants (PDAs), have been used to assist clinicians in medical nutrition since the early 1980s. The term PDA was originally applied to programmable calculators; over time, the capabilities of these devices were expanded to allow for the use of more complicated programs such as databases, spreadsheets, and electronic books. Slowly, the device evolved into what is more commonly thought of as a PDA, that is, a device such as a PalmOS (PalmSource, Inc, Tokyo, Japan) or PocketPC (Microsoft, Redmond, WA) unit. We present a review of the literature about the use of PDAs in medical nutrition, followed by a discussion of the different types of PDAs and mobile technologies that are commercially available. This is followed by a discussion of software applications that are currently available for use by nutrition clinicians, focusing on freeware applications. Finally, future technologies and applications are discussed.

  2. Textbooks on tap: using electronic books housed in handheld devices in nursing clinical courses.

    Science.gov (United States)

    Williams, Margaret G; Dittmer, Arlis

    2009-01-01

    Changing technology is creating new ways to approach nursing education and practice. Beginning in 2003, using a quasi-experimental design, this project introduced personal digital assistants (PDAs) as a clinical tool to five experimental and control groups of students and faculty. The handheld device, or PDA, was loaded with e-books for clinical practice. Differences in learning styles and preferences emerged during the different phases of the study. Students were quickly able to master the technology and use the device effectively, reporting that they liked the concise nature of the information obtained. No students expressed dissatisfaction or regret at being in the experimental group. Results and implications for clinical practice, education, and library resources are discussed.

  3. Calcium and Phosphorus Detection Using Benchtop Versus Handheld X-ray Fluorescence Spectrometers.

    Science.gov (United States)

    Kuzel, Aaron R; Christensen, Angi M; Marvin, Susan M

    2016-01-01

    Elemental analysis of calcium (Ca) and phosphorus (P) has been shown to be useful in differentiating skeletal and nonskeletal material. X-ray fluorescence spectrometry (XRF) is an attractive, nondestructive technique for forensic anthropologists, and the development of portable XRF instrumentation is promising for field applications. This study examines the performance of handheld XRF instrumentation operated in air compared to a traditional benchtop XRF device that has the ability to control the analysis atmosphere. Both instruments can be used to effectively distinguish skeletal from nonskeletal remains. However, as the measurement atmosphere affects detection levels for calcium and phosphorus, Ca/P ratios obtained from the instruments and analysis conditions were found to differ significantly, with analyses conducted in air showing significantly lower phosphorus detection. Consequently, comparison of Ca/P ratios to conclude skeletal versus nonskeletal origin must be based on data collected under similar analysis conditions.

  4. Gamma-ray detectors for intelligent, hand-held radiation monitors

    International Nuclear Information System (INIS)

    Small radiation detectors based on HgI2, bismuth germanate (BGO), plastic, or NaI(Tl) detector materials were evaluated for use in small, lighweight radiation monitors. The two denser materials, HgI2 and BGO, had poor resolution at low-energy and thus performed less well than NaI(Tl) in detecting low-energy gamma rays from bare, enriched uranium. The plastic scintillator, a Compton recoil detector, also performed less well at low gamma-ray energy. Two small NaI(Tl) detectors were suitable for detecting bare uranium and sheilded plutonium. One became part of a new lightweight hand-held monitor and the other found uses as a pole-mounted detector for monitoring hard-to-reach locations

  5. Application of handheld and portable spectrometers for screening acrylamide content in commercial potato chips.

    Science.gov (United States)

    Ayvaz, Huseyin; Rodriguez-Saona, Luis E

    2015-05-01

    The most common methods for acrylamide analysis in foods require the use of LC-MS/MS and GC-MS. Although these methods have great analytical performance, they need intensive sample preparation, highly specialised instrumentation, and are time consuming. In this study, portable and handheld infrared spectrometers were evaluated as rapid methods for screening acrylamide in potato chips and their performances were compared to those of benchtop infrared systems. The acrylamide content of 64 commercial potato chips (169-2453 μg/kg) was determined by LC-MS/MS. Spectral data were collected using mid-infrared (MIR) and near-infrared (NIR) spectrometers. Partial least squares regression (PLSR) calibration models were developed to predict acrylamide levels. Overall, good linear correlation was found between the predicted acrylamide levels and actual measured acrylamide concentrations by LC-MS/MS (rPred > 0.90 and SEP potato chips. PMID:25529665

  6. Characterization and evaluation of a handheld AC-coupled pulsed photothermal radiometry system

    Science.gov (United States)

    Jung, Byungjo; Kim, Chang-Seok; Choi, Bernard; Nelson, J. Stuart

    2006-02-01

    In laser therapy of port wine stain (PWS) birthmarks, measurement of maximum temperature rise is important to determine the maximum permissible light dose for PWS laser therapy. To measure maximum temperature rise on arbitrary PWS skin site, we developed a handheld pulsed photothermal radiometry (PPTR) system, which overcomes in vivo measurement limitations of bench-top PPTR systems. The developed PPTR system consists of an IR lens, an AC-coupled thermoelectrically cooled IR detector, a laser handpiece holder, and a fixed distance measurement port. With system characterization, experimental results were in good agreement with theoretical calculations. Preliminary results for maximum temperature rise demonstrate the feasibility of the PPTR system for PWS skin characterization in the clinic.

  7. The Rosetta phone: a hand-held device for automatic translation of signs in natural images

    Science.gov (United States)

    Jafri, Syed Ali Raza; Mikkilineni, Aravind K.; Boutin, Mireille; Delp, Edward J.

    2008-02-01

    When traveling in a region where the local language is not written using the Roman alphabet, translating written text (e.g., documents, road signs, or placards) is a particularly difficult problem since the text cannot be easily entered into a translation device or searched using a dictionary. To address this problem, we are developing the "Rosetta Phone," a handheld device (e.g., PDA or mobile telephone) capable of acquiring a picture of the text, identifying the text within the image, and producing both an audible and a visual English interpretation of the text. We started with English, as a developement language, for which we achieved close to 100% accuracy in identifying and reading text. We then modified the system to be able to read and translate words written using the Arabic character set. We currently achieve approximately 95% accuracy in reading words from a small directory of town names.

  8. A handheld low temperature atmospheric pressure air plasma gun for nanomaterial synthesis in liquid phase

    Energy Technology Data Exchange (ETDEWEB)

    Yu, Shuang; Wang, Kaile; Zuo, Shasha; Liu, Jiahui [Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871 (China); Zhang, Jue, E-mail: zhangjue@pku.edu.cn; Fang, Jing [Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871 (China); College of Engineering, Peking University, Beijing 100871 (China)

    2015-10-15

    A handheld low temperature atmospheric pressure air plasma gun based on a dielectric barrier structure with hollow electrodes was proposed. The portable plasma gun with an embedded mini air pump was driven by a 12 V direct voltage battery. The air plasma jet generated from the gun could be touched without a common shock hazard. Besides working in air, the plasma gun can also work in water. The diagnostic result of optical emission spectroscopy showed the difference in reactive species of air plasma jet between in air and in water. The plasma gun was excited in 20 ml chloroauric acid aqueous solution with a concentration of 1.214 mM. A significant amount of gold nanoparticles were synthesized after 2 min continuous discharge. The plasma gun with these unique features is applicable in plasma medicine, etching, and s-nthesis of nanomaterials.

  9. Handheld readout electronics to fully exploit the particle discrimination capabilities of elpasolite scintillators

    Energy Technology Data Exchange (ETDEWEB)

    Budden, B.S., E-mail: bbudden@lanl.gov [Intelligence and Space Research Division, Los Alamos National Laboratory, Los Alamos, NM 87545 (United States); Stonehill, L.C.; Warniment, A.; Michel, J.; Storms, S.; Dallmann, N.; Coupland, D.D.S.; Stein, P.; Weller, S.; Borges, L.; Proicou, M.; Duran, G. [Intelligence and Space Research Division, Los Alamos National Laboratory, Los Alamos, NM 87545 (United States); Kamto, J. [Intelligence and Space Research Division, Los Alamos National Laboratory, Los Alamos, NM 87545 (United States); Electrical & Computer Engineering Department, Praire View A& M University, Prairie View, TX 77446 (United States)

    2015-09-21

    A new class of elpasolite scintillators has garnered recent attention due to the ability to perform as simultaneous gamma spectrometers and thermal neutron detectors. Such a dual-mode capability is made possible by pulse-shape discrimination (PSD), whereby the emission waveform profiles of gamma and neutron events are fundamentally unique. To take full advantage of these materials, we have developed the Compact Advanced Readout Electronics for Elpasolites (CAREE). This handheld instrument employs a multi-channel PSD-capable ASIC, custom micro-processor board, front-end electronics, power supplies, and a 2 in. photomultiplier tube for readout of the scintillator. The unit is highly configurable to allow for performance optimization amongst a wide sample of elpasolites which provide PSD in fundamentally different ways. We herein provide an introduction to elpasolites, then describe the motivation for the work, mechanical and electronic design, and preliminary performance results.

  10. Quantitative evaluation of a handheld light microscope for field diagnosis of soil-transmitted helminth infection.

    Science.gov (United States)

    Bogoch, Isaac I; Andrews, Jason R; Speich, Benjamin; Ame, Shaali M; Ali, Said M; Stothard, J Russell; Utzinger, Jürg; Keiser, Jennifer

    2014-12-01

    We evaluated the Newton Nm1, a commercially available handheld light microscope and compared it with conventional light microscopy for the diagnosis of soil-transmitted helminth infections. A total of 91 Kato-Katz thick smears were examined by experienced microscopists and helminth eggs were counted and expressed as eggs per gram of stool (EPG). Mean egg counts were significantly higher with the conventional light microscope (5,190 EPG versus 2,386 EPG for Ascaris lumbricoides; 826 versus 456 for Trichuris trichiura; both P Newton Nm1 microscope may be a useful tool for the detection and quantification of soil-transmitted helminth infection in clinical, epidemiologic, and public health settings. PMID:25246697

  11. Handheld standoff mine detection system (HSTAMIDS) field evaluation in Thailand (Invited Paper)

    Science.gov (United States)

    Doheny, Robert C.; Burke, Sean; Cresci, Roger; Ngan, Peter; Walls, Richard

    2005-06-01

    The Humanitarian Demining Research and Development Program of Night Vision and Electronic Sensors Directorate (NVESD), under the direction of the Office of Assistant Secretary of Defense for Special Operations and Low-Intensity Conflict (OASD/SOLIC) and with participation from the International Test and Evaluation Project (ITEP) for Humanitarian Demining, conducted an in-country field evaluation of HSTAMIDS in the region of Humanitarian Demining Unit #1 (HMAU1) in Thailand. Participants included the US Humanitarian Demining Team of NVESD, ITEP personnel, Thailand Mine Action Center (TMAC), HALO Trust organization from Cambodia, and CyTerra Corporation. The primary objectives were to demonstrate the performance of the U.S. Army's latest handheld multisensor mine detector, the AN/PSS-14, in a demining environment in comparison to the performance of the metal detector being used by the local deminers and also to assess the performance of the trained deminers after limited experience and training with the HSTAMIDS.

  12. Performance of hand-held whole-breast ultrasound based on BI-RADS in women with mammographically negative dense breast

    Energy Technology Data Exchange (ETDEWEB)

    Youk, Ji Hyun; Kim, Eun-Kyung; Kim, Min Jung; Kwak, Jin Young; Son, Eun Ju [Yonsei University, College of Medicine, Department of Radiology, Research Institute of Radiological Science, Seoul (Korea, Republic of)

    2011-04-15

    To assess the performance of breast ultrasound based on BI-RADS final assessment categories in women with mammographically negative dense breast. Of 3,820 cases with mammographically negative dense breast and subsequent hand-held bilateral whole-breast ultrasound, a total of 1,507 cases in 1,046 women who had biopsy or at least 2-year follow-up ultrasound constituted the basis of this retrospective study. Cancer rate of each sonographic BI-RADS category was determined and medical audit was performed separately in screening-general, screening-treated, and diagnostic group. A total of 43 cases (2.9%) were confirmed as malignancy. Cancer rate among BI-RADS categories was significantly different (p < 0.0001). Among three groups, the cancer rate was significantly different (p < 0.0001) and the highest in diagnostic group (15.8%, 22 of 139). Abnormal interpretation rate, PPV of biopsy performed, cancer detection rate, and rate of early stage cancer, and the size of invasive cancer were significantly different among three groups and the highest in diagnostic group. Regarding cancer characteristics, the proportion of advanced cancer was the highest in diagnostic group. Breast ultrasound based on BI-RADS as an adjunctive to negative mammography can be useful for predicting malignancy in women with dense breast. (orig.)

  13. Normative values of hip strength in adult male association football players assessed by handheld dynamometry.

    Science.gov (United States)

    Hanna, Chris M; Fulcher, Mark L; Elley, C Raina; Moyes, Simon A

    2010-05-01

    Chronic groin pain is a common problem in association football players. Normative values for the strength of hip muscles, measured in an accurate and accessible manner, are needed to gauge strength and inform return to play decisions in this group. The purpose of this study was to define normative values of hip muscle strength using handheld dynamometry. A series of reliable clinical tests that are commonly used when making return to sport decisions in athletes with chronic adductor related groin pain have been selected. One hundred and twenty adult male association football players, free from injury, were recruited. Isometric strength of the hip flexors and adductor muscles was measured using a handheld dynamometer. Mean age was 24.9 years (SD 5.9). Eighty participants (67%) had experienced groin pain in the past. Mean strength for dominant leg hip flexion was 47.3 kg (95% confidence interval 45.6-49.0), non-dominant leg hip flexion was 42.5 kg (41.1-43.9), adduction at 0 degrees hip flexion was 35.6 kg (34.1-37.1), adduction at 45 degrees was 32.0 kg (30.9-33.1), and adduction at 90 degrees was 25.5 kg (24.4-26.5). This study establishes reference ranges and predictive equations for maximal isometric contraction strength of the hip muscles in non-injured adult male association football players. This information will assist assessment and management of an athlete's return to play following injury. PMID:19574097

  14. EXTENDED PERFORMANCE HANDHELD AND MOBILE SENSORS FOR REMOTE DETECTION OF NATURAL GAS LEAKS

    Energy Technology Data Exchange (ETDEWEB)

    Michael B. Frish; B. David Green; Richard T. Wainner; Francesca Scire-Scappuzzo; Paul Cataldi; Matthew C. Laderer

    2005-05-01

    This report summarizes work performed by Physical Sciences Inc. (PSI) to advance the state-of-the-art of surveying for leaks of natural gas from transmission and distribution pipelines. The principal project goal was to develop means of deploying on an automotive platform an improved version of the handheld laser-based standoff natural gas leak detector previously developed by PSI and known as the Remote Methane Leak Detector or RMLD. A laser beam which interrogates the air for methane is projected from a spinning turret mounted upon a van. As the van travels forward, the laser beam scans an arc to the front and sides of the van so as to survey across streets and to building walls from a moving vehicle. When excess methane is detected within the arc, an alarm is activated. In this project, we built and tested a prototype Mobile RMLD (MRMLD) intended to provide lateral coverage of 10 m and one lateral scan for every meter of forward motion at forward speeds up to 10 m/s. Using advanced detection algorithms developed as part of this project, the early prototype MRMLD, installed on the back of a truck, readily detected simulated gas leaks of 50 liters per hour. As a supplement to the originally planned project, PSI also participated in a DoE demonstration of several gas leak detection systems at the Rocky Mountain Oilfield Testing Center (RMOTC) during September 2004. Using a handheld RMLD upgraded with the advanced detection algorithms developed in this project, from within a moving vehicle we readily detected leaks created along the 7.4 mile route of a virtual gas transmission pipeline.

  15. An objective pronator drift test application (iPronator using handheld device.

    Directory of Open Access Journals (Sweden)

    Soojeong Shin

    Full Text Available BACKGROUND: The pronator drift test is widely used to detect mild arm weakness. We developed an application that runs on a handheld device to objectify the pronator drift test and investigated its feasibility in stroke patients. METHODS: The iPronator application, which uses the built-in accelerometer in handheld devices, was developed. We enrolled acute ischemic stroke patients (n = 10 with mild arm weakness and healthy controls (n = 10 to validate the iPronator. In addition to conventional neurological examinations, the degree of average, maximum, and oscillation in drift and pronation were measured and compared using the iPronator. Follow-up tests using the iPronator were also conducted in the patient group one week later. RESULTS: There was a strong correlation between the average degree of pronation and drift measured by the iPronator (r = 0.741, p<0.001. The degrees of average and maximum in pronation were greater in the patient group than in the control group [in average, 28.9°, interquartile range (IQR 18.7-40.3 vs. 3.8° (IQR 0.3-7.5, p<0.001], in maximum, 33.0° (IQR 24.0-52.1 vs. 6.2° (IQR 1.4-9.4, p<0.001]. The degree of oscillation in pronation was not different between the groups (p = 0.166. In drift, the degrees of average, maximum, and oscillation were greater in the patient group. In stroke patients, a follow-up study at one week revealed improvements in the degrees of pronation and drift compared with baseline parameters. CONCLUSIONS: The iPronator can reliably detect mild arm weakness of stroke patients and was also useful in detecting functional recovery for one week in patients with acute stroke.

  16. Hand-held tools with complex kinematics are efficiently incorporated into movement planning and online control.

    Science.gov (United States)

    Baugh, Lee A; Hoe, Erica; Flanagan, J Randall

    2012-10-01

    Certain hand-held tools alter the mapping between hand motion and motion of the tool end point that must be controlled in order to perform a task. For example, when using a pool cue, the motion of the cue tip is reversed relative to the hand. Previous studies have shown that the time required to initiate a reaching movement (Fernandez-Ruiz J, Wong W, Armstrong IT, Flanagan JR. Behav Brain Res 219: 8-14, 2011), or correct an ongoing reaching movement (Gritsenko V, Kalaska JF. J Neurophysiol 104: 3084-3104, 2010), is prolonged when the mapping between hand motion and motion of a cursor controlled by the hand is reversed. Here we show that these time costs can be significantly reduced when the reversal is instantiated by a virtual hand-held tool. Participants grasped the near end of a virtual tool, consisting of a rod connecting two circles, and moved the end point to displayed targets. In the reversal condition, the rod translated through, and rotated about, a pivot point such that there was a left-right reversal between hand and end point motion. In the nonreversal control, the tool translated with the hand. As expected, when only the two circles were presented, movement initiation and correction times were much longer in the reversal condition. However, when full vision of the tool was provided, the reaction time cost was almost eliminated. These results indicate that tools with complex kinematics can be efficiently incorporated into sensorimotor control mechanisms used in movement planning and online control.

  17. Laboratory Tests of a Handheld X-Ray Fluorescence Spectrometer: A Tool for Planetary Exploration

    Science.gov (United States)

    Young, K. E.; Evans, C. A.; Hodges, K.

    2011-12-01

    Maximizing the science return from a mission to another planetary surface involves the integration of science objectives with deployable technologies that enable the collection of data and samples. For long duration manned missions, it is likely that more samples will be collected than can be returned to Earth due to mass limits. A niche exists for technologies that help prioritize samples for return, provide data for future sample handling and curation, and characterization for samples that are not returned to Earth. To fill this niche, hardware and protocols for field instruments are currently being developed and evaluated at NASA Johnson Space Center and Arizona State University. Our goal is to develop an easily used, environmentally isolated facility as part of the astronaut surface habitat for preliminary sample characterization and down-selection. NASA has constructed a prototype, GeoLab, as a testbed for evaluating the scientific applicability and operational considerations of various analytical instruments. One instrument under evaluation is a small, portable x-ray fluorescence (XRF) spectrometer that can be also be used by astronaut explorers as part of their field gear while on scientific sorties, or on robotic field assistants. We report on preliminary usability tests for commercially available handheld XRF instruments. These instruments collect data by contacting the surface of a rock or sediment sample with an 8 mm-wide sensor window. Within 60 seconds, the devices can provide relatively precise data on the abundance of major and trace elements heavier than Na. Lab-based handheld XRF analyses of terrestrial and lunar samples, compared with those made with full-scale laboratory XRF systems, show good correlation, but we continue to investigate potential sources of error and the need for careful calibration with standards of known composition. Specifically, we use a suite of five terrestrial and five lunar basalts, all well characterized by conventional

  18. D Building FAÇADE Reconstruction Using Handheld Laser Scanning Data

    Science.gov (United States)

    Sadeghi, F.; Arefi, H.; Fallah, A.; Hahn, M.

    2015-12-01

    3D The three dimensional building modelling has been an interesting topic of research for decades and it seems that photogrammetry methods provide the only economic means to acquire truly 3D city data. According to the enormous developments of 3D building reconstruction with several applications such as navigation system, location based services and urban planning, the need to consider the semantic features (such as windows and doors) becomes more essential than ever, and therefore, a 3D model of buildings as block is not any more sufficient. To reconstruct the façade elements completely, we employed the high density point cloud data that obtained from the handheld laser scanner. The advantage of the handheld laser scanner with capability of direct acquisition of very dense 3D point clouds is that there is no need to derive three dimensional data from multi images using structure from motion techniques. This paper presents a grammar-based algorithm for façade reconstruction using handheld laser scanner data. The proposed method is a combination of bottom-up (data driven) and top-down (model driven) methods in which, at first the façade basic elements are extracted in a bottom-up way and then they are served as pre-knowledge for further processing to complete models especially in occluded and incomplete areas. The first step of data driven modelling is using the conditional RANSAC (RANdom SAmple Consensus) algorithm to detect façade plane in point cloud data and remove noisy objects like trees, pedestrians, traffic signs and poles. Then, the façade planes are divided into three depth layers to detect protrusion, indentation and wall points using density histogram. Due to an inappropriate reflection of laser beams from glasses, the windows appear like holes in point cloud data and therefore, can be distinguished and extracted easily from point cloud comparing to the other façade elements. Next step, is rasterizing the indentation layer that holds the windows

  19. Wavelet Menus on Handheld Devices: Stacking Metaphor for Novice Mode and Eyes-Free Selection for Expert Mode

    OpenAIRE

    Francone, Jeremie; Bailly, Gilles; Lecolinet, Éric; Mandran, Nadine; Nigay, Laurence

    2010-01-01

    International audience This paper presents the design and evaluation of the Wavelet menu and its implementation on the iPhone. The Wavelet menu consists of a concentric hierarchical Marking menu using simple gestures. The novice mode, i.e. when the menu is displayed, is well adapted to the limited screen space of handheld devices because the representation of the menu hierarchy is inverted, the deeper submenu being always displayed at the center of the screen. The visual design is based on...

  20. Intrarater reliabilities of shoulder joint horizontal adductor muscle strength measurements using a handheld dynamometer for geriatric and stroke patients

    OpenAIRE

    Hirano, Masahiro; Katoh, Munenori; Kawaguchi, Saori; Uemura, Tomomi

    2016-01-01

    [Purpose] This study aimed to verify the appropriate number of measurements and the intrarater reliabilities of shoulder joint horizontal adductor muscle strength measurements using a handheld dynamometer (HHD) for geriatric and stroke patients. [Subjects and Methods] The subjects were 40 inpatients, who were divided into two groups: 20 stroke patients in the stroke group (SG), and 20 geriatric patients in the no-stroke group (N-SG). Measurements were performed three times using an HHD with a...

  1. Limits of the manipulative-fixed method for measurement of shoulder joint horizontal adduction muscle strength using a handheld dynamometer

    OpenAIRE

    Hirano, Masahiro; Katoh, Munenori

    2015-01-01

    [Purpose] The aim of this study was to verify the limit of isometric muscle strength of shoulder joint horizontal adduction using handheld dynamometer (HHD) manipulated by hand (referred to as the manipulative-fixed method). [Subjects and Methods] The subjects were 33 healthy college students. The examiner was a healthy college student. Shoulder joint horizontal adductor muscle strength was measured using HHD with the subject in the supine position. The belt-fixed and manipulative-fixed metho...

  2. How look-up frequency affects EFL learning?: An empirical study on the use of handheld-electronic dictionaries

    OpenAIRE

    Koyama, Toshiko; 小山, 敏子; Takeuchi, Osamu; 竹内, 理

    2004-01-01

    The main purpose of this research is to explore the differences in learners' look-up behavior between handheld-electronic dictionaries (hereafter ED) and printed dictionaries (hereafter PD). We focused, particularly, on the relation between learners' look-up frequency and degree of reading comprehension of the text. A total of 72 undergraduate students participated in the experiment, and were divided into two groups (ED and PD Groups) with approximately the same proficiency. Each group was as...

  3. Mobile Testing of Cognitive Function : A tool for assessment of cognitive abilities in an everyday environment using a handheld device

    OpenAIRE

    Fouchenette, Kim

    2011-01-01

    The unit of Cognitive Developmental Neuroscience at Karolinska Institutet have developed a method for measuring cognitive performance with handheld devices, which resulted in a mobile application for the iPod Touch. The application was previously used in a clinical trial with individuals suffering from chronic stress disorder, but had to be further developed. The application, which consisted of cognitive tests and questionnaires, required improvements that could be divided into three parts: (...

  4. Design, development and characterization of a handheld electrochemical analyzer system : in the perspective of DNA biosensors for foodbourne pathogen detection

    OpenAIRE

    Velusamy, Vijayalakshmi

    2012-01-01

    peer-reviewed Detailed in this work is the design and development of a novel handheld electrochemical analyzer system interfaced to smart phone. The custom made electrochemical analyzer is versatile, cost-effective and can be used for real-time applications. The electrochemical analyzer was characterised for electron transfer events associated with chemical and biological samples. The presented design was implemented based on the Arduino Nano open source electronics proto...

  5. Simultaneous hand-held contact color fundus and SD-OCT imaging for pediatric retinal diseases (Conference Presentation)

    Science.gov (United States)

    Ruggeri, Marco; Hernandez, Victor; De Freitas, Carolina; Relhan, Nidhi; Silgado, Juan; Manns, Fabrice; Parel, Jean-Marie

    2016-03-01

    Hand-held wide-field contact color fundus photography is currently the standard method to acquire diagnostic images of children during examination under anesthesia and in the neonatal intensive care unit. The recent development of portable non-contact hand-held OCT retinal imaging systems has proved that OCT is of tremendous help to complement fundus photography in the management of pediatric patients. Currently, there is no commercial or research system that combines color wide-field digital fundus and OCT imaging in a contact-fashion. The contact of the probe with the cornea has the advantages of reducing motion experienced by the photographer during the imaging and providing fundus and OCT images with wider field of view that includes the periphery of the retina. In this study we produce proof of concept for a contact-type hand-held unit for simultaneous color fundus and OCT live view of the retina of pediatric patients. The front piece of the hand-held unit consists of a contact ophthalmoscopy lens integrating a circular light guide that was recovered from a digital fundus camera for pediatric imaging. The custom-made rear piece consists of the optics to: 1) fold the visible aerial image of the fundus generated by the ophthalmoscopy lens on a miniaturized level board digital color camera; 2) conjugate the eye pupil to the galvanometric scanning mirrors of an OCT delivery system. Wide-field color fundus and OCT images were simultaneously obtained in an eye model and sequentially obtained on the eye of a conscious 25 year-old human subject with healthy retina.

  6. Torque Removal Evaluation of Screw in One-Piece and Two-Piece Abutments Tightened with a Handheld screwdriver

    Directory of Open Access Journals (Sweden)

    Jalil Ghanbarzadeh

    2013-12-01

    Full Text Available Introduction: Some clinicians use a handheld screw driver instead of a torque wrench to definitively tighten abutment screws. The aim of this study was to compare the removal torque of one-piece and two-piece abutments tightened with a handheld driver and a torque control ratchet. Methods: 40 ITI implants were placed in acrylic blocks and divided into 4 groups. In groups one and two, 10 ITI one-piece abutments (Solid® and in groups three and four, 10 ITI two-piece abutments (Synocta® were placed on the implants. In groups one and three abutments were tightened by 5 experienced males and 5 experienced females using a handheld driver. In groups two and four abutments were tightened using a torque wrench with torque values of 10, 20 and 35 N.cm. Insertion torque and removal torque values of the abutments were measured with a digital torque meter. Results: The insertion torque values (ITVs of males in both abutments were significantly higher than those of females. ITVs in both Solid® and Synocta® abutments tightened with a handheld screwdriver were similar to the torque of 20 N.cm in the torque wrench. Removal torque values (RTVs of solid® abutments were higher than those of synocta® abutments. Conclusion: The one- piece abutments (solid® showed higher RTVs than the two-piece abutments (synocta®. Hand driver does not produce sufficient preload force for the final tightening of the abutment

  7. Rapid prediction of total petroleum hydrocarbons in soil using a hand-held mid-infrared field instrument.

    Science.gov (United States)

    Webster, Grant T; Soriano-Disla, José M; Kirk, Joel; Janik, Leslie J; Forrester, Sean T; McLaughlin, Mike J; Stewart, Richard J

    2016-11-01

    This manuscript reports on the performance of a hand-held diffuse reflectance (mid)-infrared Fourier transform (DRIFT) spectrometer for the prediction of total petroleum hydrocarbons (TPH) in three different diesel-contaminated soils. These soils include: a carbonate dominated clay, a kaolinite dominated clay and a loam from Padova Italy, north Western Australia and southern Nigeria, respectively. Soils were analysed for TPH concentration using a standard laboratory methods and scanned in DRIFT mode with the hand-held spectrometer to determine TPH calibration models. Successful partial least square regression (PLSR) predictions, with coefficient of determination (R(2)) ~0.99 and root mean square error (RMSE) soil type. Prediction models were also tested for the full concentration range (0-60,000mg/kg) for each soil type model with R(2) and RMSE values of ~0.99 and soil type with similar R(2) values of ~0.99 and RMSE values soil types and the potential for being a rapid in-field screening method for TPH concentration levels at common regulatory thresholds. A novel hand-held mid-infrared instrument can accurately detect TPH across different soil types and concentrations, which paves the way for a variety of applications in the field. PMID:27591631

  8. Murine fundus fluorescein angiography: An alternative approach using a handheld camera.

    Science.gov (United States)

    Ehrenberg, Moshe; Ehrenberg, Scott; Schwob, Ouri; Benny, Ofra

    2016-07-01

    In today's modern pharmacologic approach to treating sight-threatening retinal vascular disorders, there is an increasing demand for a compact, mobile, lightweight and cost-effective fluorescein fundus camera to document the effects of antiangiogenic drugs on laser-induced choroidal neovascularization (CNV) in mice and other experimental animals. We have adapted the use of the Kowa Genesis Df Camera to perform Fundus Fluorescein Angiography (FFA) in mice. The 1 kg, 28 cm high camera has built-in barrier and exciter filters to allow digital FFA recording to a Compact Flash memory card. Furthermore, this handheld unit has a steady Indirect Lens Holder that firmly attaches to the main unit, that securely holds a 90 diopter lens in position, in order to facilitate appropriate focus and stability, for photographing the delicate central murine fundus. This easily portable fundus fluorescein camera can effectively record exceptional central retinal vascular detail in murine laser-induced CNV, while readily allowing the investigator to adjust the camera's position according to the variable head and eye movements that can randomly occur while the mouse is optimally anesthetized. This movable image recording device, with efficiencies of space, time, cost, energy and personnel, has enabled us to accurately document the alterations in the central choroidal and retinal vasculature following induction of CNV, implemented by argon-green laser photocoagulation and disruption of Bruch's Membrane, in the experimental murine model of exudative macular degeneration. PMID:27260483

  9. Hazardous metals in vintage plastic toys measured by a handheld X-ray fluorescence spectrometer.

    Science.gov (United States)

    Miller, Gillian Zaharias; Harris, Zoe E

    2015-01-01

    Over 100 plastic toys from the 1970s and 1980s, both polyvinyl chloride ("vinyl") and nonvinyl, were analyzed in the study described here using a handheld X-ray fluorescence spectrometer to quantify hazardous metal content. A sampling of recent vinyl toys was also tested. The majority of nonvinyl samples were Fisher Price brand toys. The vinyl toys consisted largely of Barbie dolls and other dolls. Overall, lead or cadmium was found in 67% of vintage plastic toys, frequently at concentrations exceeding current U.S. and European limits. Arsenic was detected at levels of concern in 16% of the samples. In the nonvinyl toys, heavy metal content was found to correlate with certain colors of plastic. The likely sources of the detected metals are discussed. None of the contemporary vinyl toys contained detectable cadmium, lead, or arsenic. Given that vintage toys remain in widespread use by children in homes and other locations, the results illuminate a potential source of heavy metal exposure for children.

  10. Reliability of handheld dynamometry in assessment of hip strength in adult male football players.

    Science.gov (United States)

    Fulcher, Mark L; Hanna, Chris M; Raina Elley, C

    2010-01-01

    The aim of this study was to evaluate the intra- and interrater reliability of handheld dynamometry (HHD) for measuring hip muscle strength in a sample of 30 healthy semi-professional adult male football players. The reliability of HHD had not been assessed in athletes who were likely to be stronger than populations tested previously. Maximal isometric strength of resisted hip flexion and adduction were measured. Mean strength ranged from 51.5 kg for dominant hip flexion to 26.7 kg for hip adduction at 90 degrees of hip flexion. Intrarater reliability intraclass correlation coefficients (ICCs) ranged from 0.70 to 0.89. ICCs for interrater reliability ranged from 0.66 to 0.87. As expected, muscle strength in this group of athletes was significantly higher than that of populations in which HHD reliability has been assessed. Despite this, muscle strength testing of hip flexor and adductor muscles can be performed with good to excellent intra- and interrater reliability in this population. PMID:19376747

  11. Development of fluorescence based handheld imaging devices for food safety inspection

    Science.gov (United States)

    Lee, Hoyoung; Kim, Moon S.; Chao, Kuanglin; Lefcourt, Alan M.; Chan, Diane E.

    2013-05-01

    For sanitation inspection in food processing environment, fluorescence imaging can be a very useful method because many organic materials reveal unique fluorescence emissions when excited by UV or violet radiation. Although some fluorescence-based automated inspection instrumentation has been developed for food products, there remains a need for devices that can assist on-site inspectors performing visual sanitation inspection of the surfaces of food processing/handling equipment. This paper reports the development of an inexpensive handheld imaging device designed to visualize fluorescence emissions and intended to help detect the presence of fecal contaminants, organic residues, and bacterial biofilms at multispectral fluorescence emission bands. The device consists of a miniature camera, multispectral (interference) filters, and high power LED illumination. With WiFi communication, live inspection images from the device can be displayed on smartphone or tablet devices. This imaging device could be a useful tool for assessing the effectiveness of sanitation procedures and for helping processors to minimize food safety risks or determine potential problem areas. This paper presents the design and development including evaluation and optimization of the hardware components of the imaging devices.

  12. Hand-Held Instrument Fights Acne, Tops Over-the-Counter Market

    Science.gov (United States)

    2007-01-01

    Tyrell Inc., a Houston-based medical technologies company, was able to access engineering support in redesigning a heating element for a hand-held acne-fighting device through SATOP, NASA's Space Alliance Technology Outreach Program. SATOP put Tyrell in contact with The Boeing Company, which assessed the design and made several major contributions. The product, named Zeno, is now the highest selling over-the-counter medical device for the treatment of acne, and in 2006, Zeno was named the "SATOP Texas, Success Story of the Year." Zeno employs proprietary ClearPoint technology to provide relief of mild to moderate inflammatory acne by delivering a precisely controlled low-level dosage of heat to the blemish, causing the bacteria at the root of more than 90 percent of acne to self-destruct. Within its first year on the market, Zeno was cited by various publications for several awards, including Allure's 2005 "Best of Beauty," Marie Claire's "10 Best Gadgets for Girls," and Popular Science's 2005 "Best of What's New." A variation of the Zeno for use in treating herpetic lesions such as cold sores, by killing the virus that causes them, is currently undergoing FDA trials.

  13. Developing handheld real time multispectral imager to clinically detect erythema in darkly pigmented skin

    Science.gov (United States)

    Kong, Linghua; Sprigle, Stephen; Yi, Dingrong; Wang, Fengtao; Wang, Chao; Liu, Fuhan

    2010-02-01

    Pressure ulcers have been identified as a public health concern by the US government through the Healthy People 2010 initiative and the National Quality Forum (NQF). Currently, no tools are available to assist clinicians in erythema, i.e. the early stage pressure ulcer detection. The results from our previous research (supported by NIH grant) indicate that erythema in different skin tones can be identified using a set of wavelengths 540, 577, 650 and 970nm. This paper will report our recent work which is developing a handheld, point-of-care, clinicallyviable and affordable, real time multispectral imager to detect erythema in persons with darkly pigmented skin. Instead of using traditional filters, e.g. filter wheels, generalized Lyot filter, electrical tunable filter or the methods of dispersing light, e.g. optic-acoustic crystal, a novel custom filter mosaic has been successfully designed and fabricated using lithography and vacuum multi layer film technologies. The filter has been integrated with CMOS and CCD sensors. The filter incorporates four or more different wavelengths within the visual to nearinfrared range each having a narrow bandwidth of 30nm or less. Single wavelength area is chosen as 20.8μx 20.8μ. The filter can be deposited on regular optical glass as substrate or directly on a CMOS and CCD imaging sensor. This design permits a multi-spectral image to be acquired in a single exposure, thereby providing overwhelming convenience in multi spectral imaging acquisition.

  14. Improvement of registration accuracy of a handheld augmented reality system for urban landscape simulation

    Directory of Open Access Journals (Sweden)

    Tomohiro Fukuda

    2014-12-01

    Full Text Available The need for visual landscape assessment in large-scale projects for the evaluation of the effects of a particular project on the surrounding landscape has grown in recent years. Augmented reality (AR has been considered for use as a landscape simulation system in which a landscape assessment object created by 3D models is included in the present surroundings. With the use of this system, the time and the cost needed to perform a 3DCG modeling of present surroundings, which is a major issue in virtual reality, are drastically reduced. This research presents the development of a 3D map-oriented handheld AR system that achieves geometric consistency using a 3D map to obtain position data instead of GPS, which has low position information accuracy, particularly in urban areas. The new system also features a gyroscope sensor to obtain posture data and a video camera to capture live video of the present surroundings. All these components are mounted in a smartphone and can be used for urban landscape assessment. Registration accuracy is evaluated to simulate an urban landscape from a short- to a long-range scale. The latter involves a distance of approximately 2000 m. The developed AR system enables users to simulate a landscape from multiple and long-distance viewpoints simultaneously and to walk around the viewpoint fields using only a smartphone. This result is the tolerance level of landscape assessment. In conclusion, the proposed method is evaluated as feasible and effective.

  15. Handheld probe integrating laser diode and ultrasound transducer array for ultrasound/photoacoustic dual modality imaging.

    Science.gov (United States)

    Daoudi, K; van den Berg, P J; Rabot, O; Kohl, A; Tisserand, S; Brands, P; Steenbergen, W

    2014-10-20

    Ultrasound and photoacoustics can be utilized as complementary imaging techniques to improve clinical diagnoses. Photoacoustics provides optical contrast and functional information while ultrasound provides structural and anatomical information. As of yet, photoacoustic imaging uses large and expensive systems, which limits their clinical application and makes the combination costly and impracticable. In this work we present and evaluate a compact and ergonomically designed handheld probe, connected to a portable ultrasound system for inexpensive, real-time dual-modality ultrasound/photoacoustic imaging. The probe integrates an ultrasound transducer array and a highly efficient diode stack laser emitting 130 ns pulses at 805 nm wavelength and a pulse energy of 0.56 mJ, with a high pulse repetition frequency of up to 10 kHz. The diodes are driven by a customized laser driver, which can be triggered externally with a high temporal stability necessary to synchronize the ultrasound detection and laser pulsing. The emitted beam is collimated with cylindrical micro-lenses and shaped using a diffractive optical element, delivering a homogenized rectangular light intensity distribution. The system performance was tested in vitro and in vivo by imaging a human finger joint.

  16. Noise surveys of hand-held pneumatic rock drills in Hong Kong.

    Science.gov (United States)

    Tah-Chew, T; Keung, W C

    1991-10-01

    A study of the noise generated by hand-held pneumatic rock drills at 15 road works locations in Hong Kong was conducted in 1989. The locations of road construction works were identified over one week period. Sound pressure levels (SPL) and band frequency analysis were measured with the integrated sound level meter at the level of the operator's ears. The sound levels for all 15 operators exceeded the local statutory limit of 90 dBA. The average sound level was 107.4 dBA and the corresponding continuous equivalent level adjusted to 8 hours or L eq (8h) was 104.8 dBA. The sound levels for the octave frequencies from 125 Hertz to 8000 Hertz were all in excess of 90 dBA. Estimates of the risk of developing hearing impairment for conversation speech among the operators were 18% and 42% after 5 and 10 years of exposure, respectively. Although there is adequate statutory control to restrict and reduce the hazards caused by noise at road construction works to the workers and to the public at large, no noise control measures were noted at the work sites and none of the operators used hearing protection. This situation was compounded by the short-term nature of road works and the high mobility of the operators.

  17. Aortic atherosclerotic plaque detection using a multiwavelength handheld photoacoustic imaging system

    Science.gov (United States)

    Hirano, Susumu; Namita, Takeshi; Kondo, Kengo; Yamakawa, Makoto; Shiina, Tsuyoshi

    2016-03-01

    Patients affected by diseases caused by arteriosclerosis are increasing. Atherosclerosis, which is becoming an especially difficult health problem, forms plaques from lipids such as cholesterol located in walls of the aorta, cerebral artery, and coronary artery. Because lipid-rich plaques are vulnerable and because arterial rupture causes acute vascular occlusion, early detection is crucially important to prevent plaque growth and rupture. Ultrasound systems can detect plaques but cannot discriminate between vulnerable and equable plaques. To evaluate plaques non-invasively and easily, we developed a handheld photoacoustic imaging device. Its usefulness was verified in phantom experiments with a bovine aorta in which mimic plaque had been embedded. Photoacoustic images taken at wavelengths that produce high light absorbance by lipids show strong photoacoustic signals from the boundary of the mimic plaque. Results confirmed that our system can evaluate plaque properties by analysis with the photoacoustic spectrum. The effects of surrounding tissues and tissue components on plaque evaluation were investigated using a layered phantom. The mimic plaque located under a 6 mm blood layer was also evaluated. Results of these analyses demonstrate the system's usefulness.

  18. Handheld and portable test systems for immunodiagnostics, nucleic acid detection and more

    Science.gov (United States)

    Faulstich, Konrad; Haberstroh, Klaus; Gruler, Roman; Eberhard, Michael; Wiest, Thomas; Lentzsch, Dirk

    2008-04-01

    Emergency Diagnostics, Homeland Security, Epidemiological Preparedness and the high cost of the Health Care Systems have increased demand for affordable and mobile point of care (POC) devices with highest sensitivity, specificity and rapid time to result. We have developed pocket sized systems for point of care and field based tests based on fluorescence read-out. The core consists of battery operated, 90 gram electro-optical units with optional wireless data transfer, which have been optimized to achieve highest accuracy and sensitivity paired with simplicity of use. The robust systems have been applied to molecular diagnostics such as DNA based testing, immunodiagnostics as well as environmental monitoring and agricultural testing. We will show examples of DNA testing, testing of drugs and toxins, cell based assays and water monitoring. We will discuss drivers and rationale for mobile testing platforms and address critical points such as sample preparation and sampling problems e.g. target delivery in small volumes. ESE's battery-operated handheld and mobile testing platforms have been shown to provide sensitive, accurate, and specific results, as well as rapid turnaround. The stand-alone devices demonstrate operational and physical robustness, and they can be manufactured to be affordable. Some underlying assays work directly from clinical samples such as urine or blood.

  19. High-resolution handheld rigid endomicroscope based on full-field optical coherence tomography

    Science.gov (United States)

    Benoit a la Guillaume, Emilie; Martins, Franck; Boccara, Claude; Harms, Fabrice

    2016-02-01

    Full-field optical coherence tomography (FF-OCT) is a powerful tool for nondestructive assessment of biological tissue, i.e., for the structural examination of tissue in depth at a cellular resolution. Mostly known as a microscopy device for ex vivo analysis, FF-OCT has also been adapted to endoscopy setups since it shows good potential for in situ cancer diagnosis and biopsy guidance. Nevertheless, all the attempts to perform endoscopic FF-OCT imaging did not go beyond lab setups. We describe here, to the best of our knowledge, the first handheld FF-OCT endoscope based on a tandem interferometry assembly using incoherent illumination. A common-path passive imaging interferometer at the tip of an optical probe makes it robust and insensitive to environmental perturbations, and a low finesse Fabry-Perot processing interferometer guarantees a compact system. A good resolution (2.7 μm transverse and 6 μm axial) is maintained through the long distance, small diameter relay optics of the probe, and a good signal-to-noise ratio is achieved in a limited 100 ms acquisition time. High-resolution images and a movie of a rat brain slice have been recorded by moving the contact endoscope over the surface of the sample, allowing for tissue microscopic exploration at 20 μm under the surface. These promising ex vivo results open new perspectives for in vivo imaging of biological tissue, in particular, in the field of cancer and surgical margin assessment.

  20. Design and preliminary testing of a handheld antagonistic SMA actuator for cancellation of human tremor

    Science.gov (United States)

    Pathak, Anupam; Brei, Diann; Luntz, Jonathan

    2009-03-01

    Essential Tremor is a debilitating disorder that in the US alone is estimated to affect up to ten million people. Unfortunately current treatments (i.e. drug therapy and surgical procedures), are limited in effectiveness and often pose a risk of adverse side-effects. In response to this problem, this paper describes an active cancellation device based on a hand-held Shape Memory Alloy (SMA) actuated stabilization platform. The assistive device is designed to hold and stabilize various objects (e.g. eating utensils, tools, pointing implements, etc.) by sensing the user's tremor and moving the object in an opposite direction using SMA actuators configured in biologically inspired antagonistic pairs. To aid in the design, performance prediction and control of the device, a device model is described that accounts for the device kinematics, SMA thermo-mechanics, and the heat transfer resulting from electrical heating and convective cooling. The system of differential equations in this device model coupled with the controller gain can be utilized to design the operation given a frequency range and power requirement. To demonstrate this, a prototype was built and experimentally tested under external disturbances in the range of 1-5 Hz, resulting in amplitude reduction of up to 80%. The extent of cancellation measured for both single-frequencies and actual human tremor disturbances demonstrate the promise of this approach as a broadly used assistive device for the multitudes afflicted by tremor.

  1. Evaluation of the Roche CoaguChek XS handheld coagulation analyzer in a cardiac outpatient clinic.

    Science.gov (United States)

    Nam, Myung-Hyun; Roh, Kyoung Ho; Pak, Hui-Nam; Lee, Chang Kyu; Kim, Young-Hoon; Lee, Kap No; Cho, Yunjung

    2008-01-01

    This study evaluated the performance of a handheld coagulation analyzer for measurements of capillary blood specimens of 93 outpatient cardiology patients with atrial fibrillation who were receiving oral anti-coagulant therapy. The international normalized ratio (INR) results of the CoaguChek XS system (Roche Diagnostics) were compared with those obtained in the central laboratory with citrated venous blood specimens using the ACL9000 coagulation analyzer (Instrumentation Laboratory). The INR results for prothrombin time by the CoaguChek XS analyzer were closely correlated with the central laboratory's results in the INR range of 0.96 approximately 8.53 (r = 0.964). A statistically significant difference was noted between 2 lots of test strips, but the difference was miniscule (mean +/- 95% confidence interval: 0.04+/-0.02). The CV of 8 replicate assays with the CoaguChek XS for a blood specimen with high INR value (INR=3.9) was 1.4%; for a blood specimen with medium INR value (INR=1.3), the CV of 8 replicate assays was XS analyzer is precise and reliable for assessment of INR results at clinically significant ranges in cardiac outpatients.

  2. Design of a Handheld Pseudo Random Coded UWB Radar for Human Sensing

    Directory of Open Access Journals (Sweden)

    Xia Zheng-huan

    2015-10-01

    Full Text Available This paper presents the design of a handheld pseudo random coded Ultra-WideBand (UWB radar for human sensing. The main tasks of the radar are to track the moving human object and extract the human respiratory frequency. In order to achieve perfect penetrability and good range resolution, m sequence with a carrier of 800 MHz is chosen as the transmitting signal. The modulated m-sequence can be generated directly by the high-speed DAC and FPGA to reduce the size of the radar system, and the mean power of the transmitting signal is 5 dBm. The receiver has two receiving channels based on hybrid sampling, the first receiving channel is to sample the reference signal and the second receiving channel is to obtain the radar echo. The real-time pulse compression is computed in parallel with a group of on-chip DSP48E slices in FPGA to improve the scanning rate of the radar system. Additionally, the algorithms of moving target tracking and life detection are implemented using Intel’s micro-processor, and the detection results are sent to the micro displayer fixed on the helmet. The experimental results show that the moving target located at less than 16 m far away from the wall can be tracked, and the respiratory frequency of the static human at less than 14 m far away from the wall can be extracted.

  3. Detection of fecal contamination on beef meat surfaces using handheld fluorescence imaging device (HFID)

    Science.gov (United States)

    Oh, Mirae; Lee, Hoonsoo; Cho, Hyunjeong; Moon, Sang-Ho; Kim, Eun-Kyung; Kim, Moon S.

    2016-05-01

    Current meat inspection in slaughter plants, for food safety and quality attributes including potential fecal contamination, is conducted through by visual examination human inspectors. A handheld fluorescence-based imaging device (HFID) was developed to be an assistive tool for human inspectors by highlighting contaminated food and food contact surfaces on a display monitor. It can be used under ambient lighting conditions in food processing plants. Critical components of the imaging device includes four 405-nm 10-W LEDs for fluorescence excitation, a charge-coupled device (CCD) camera, optical filter (670 nm used for this study), and Wi-Fi transmitter for broadcasting real-time video/images to monitoring devices such as smartphone and tablet. This study aimed to investigate the effectiveness of HFID in enhancing visual detection of fecal contamination on red meat, fat, and bone surfaces of beef under varying ambient luminous intensities (0, 10, 30, 50 and 70 foot-candles). Overall, diluted feces on fat, red meat and bone areas of beef surfaces were detectable in the 670-nm single-band fluorescence images when using the HFID under 0 to 50 foot-candle ambient lighting.

  4. On-chip lysis of mammalian cells through a handheld corona device.

    Science.gov (United States)

    Escobedo, C; Bürgel, S C; Kemmerling, S; Sauter, N; Braun, T; Hierlemann, A

    2015-07-21

    On-chip lysis is required in many lab-on-chip applications involving cell studies. In these applications, the complete disruption of the cellular membrane and a high lysis yield is essential. Here, we present a novel approach to lyse cells on-chip through the application of electric discharges from a corona handheld device. The method only requires a microfluidic chip and a low-cost corona device. We demonstrate the effective lysis of BHK and eGFP HCT 116 cells in the sub-second time range using an embedded microelectrode. We also show cell lysis of non-adherent K562 leukemia cells without the use of an electrode in the chip. Cell lysis has been assessed through the use of bright-field microscopy, high-speed imaging and cell-viability fluorescence probes. The experimental results show effective cell lysis without any bubble formation or significant heating. Due to the simplicity of both the components involved and the lysis procedure, this technique offers an inexpensive lysis option with the potential for integration into lab-on-a-chip devices.

  5. Ultra-low power HOT MCT grown by MOVPE for handheld applications

    Science.gov (United States)

    Pillans, Luke; Baker, Ian; McEwen, R. Kennedy

    2014-06-01

    In 2012 Selex ES demonstrated High Operating Temperature (HOT) MCT detectors with 5μm cut-off wavelength and f/4 aperture operating at temperatures above 200K. These detectors are grown by Metal Organic Vapour Phase Epitaxy (MOVPE) which enables fine control over the photo-diode structure. Since 2012 Selex has created two further generations of MOVPE HOT MCT, progressively improving operability and yield. This paper presents performance data for Selex's third generation of HOT MCT technology and describes the improvements to the diode design and materials processing that have enabled these advances. A parallel program has developed miniature Dewars with lower heatload and reduced manufacturing costs. When integrated with the latest generation of miniature linear cryo-engines the required cooler power is reduced to the region of 1W at temperatures of 200K. This paper will present example imagery from a detector operating with <1 Watt cooler input power. The combination of third generation HOT MCT, high efficiency Dewars and miniature linear coolers will allow a drastic reduction in SWAP-C for long range hand-held thermal imagers.

  6. Droplet-size characterization of handheld atomization equipment typically used in vector control.

    Science.gov (United States)

    Hoffmann, W Clint; Walker, Todd W; Smith, Vince L; Martin, Dan E; Fritz, Brad K

    2007-09-01

    The atomization characteristics of 4 handheld sprayers (Leco P-1, Colt ULV Aerosol Generator, ULVAFAN MK2, Turbair ElectraFan 12) and a Stih1 SR400 backpack sprayer were evaluated with the use of water- and oil-based solutions. The effects on droplet-size spectrum (i.e., droplet size) for 3 insecticides (Tempo SC Ultra, Anvil 10+10, and Aqua-Reslin) were also evaluated. Generic solutions were used to simulate the physical properties of the active-ingredient solutions in some tests. Significant differences were observed in the droplet spectrum generated by the different sprayers. The volume median diameter of the equipment tested ranged from 14.9 to 90.5 microm for the water-based solutions and from 11.7 to 92.4 microm for the oil-based solutions. The Colt ULV sprayer was the only one tested that complied with label requirements for aerosols, yielding acceptable Dv0.5 values of 14.9 16.0 microm with water-based Aqua-Reslin and 14.1 microm with Anvil 10+10. The information presented will allow equipment operators to make an informed decision when selecting equipment and operational parameters. PMID:17939513

  7. Handheld cellular phones restrict head movements and range of visual regard.

    Science.gov (United States)

    Thumser, Zachary C; Stahl, John S

    2013-02-01

    Numerous studies have reported the ability of mobile phones to distract users and thereby degrade performance of concurrent tasks. Less is known about whether the phone-holding posture can itself influence concurrent motor activities. Horizontal eye movements are often coordinated with head movements, particularly when the amplitude of the gaze shift is large. Holding a phone to one ear has been shown to restrict the range of spontaneously generated head movements. In order to determine whether the phone-holding posture also influences gaze, we recorded eye and head movements as volunteers looked about themselves spontaneously. Holding the phone to the ear narrowed the range of gaze, principally in subjects who exhibit a strong propensity to move the head with the eyes. We argue that visual exploration may be influenced by the balance between costs and benefits of turning the head, with the phone-holding posture increasing the costs. The effects on gaze would be seen most clearly in subjects who have a higher predilection for coupling eye and head movements. Conversely, this effect would be minimal if tested in tasks that rarely elicit head movements in the specific subjects being tested. The results emphasize the close coordination between eye and head movements, and have implications for the design of ergonomic studies comparing the effects of handheld vs. hands-free mobile phones on performance of specific tasks, such as driving.

  8. Murine fundus fluorescein angiography: An alternative approach using a handheld camera.

    Science.gov (United States)

    Ehrenberg, Moshe; Ehrenberg, Scott; Schwob, Ouri; Benny, Ofra

    2016-07-01

    In today's modern pharmacologic approach to treating sight-threatening retinal vascular disorders, there is an increasing demand for a compact, mobile, lightweight and cost-effective fluorescein fundus camera to document the effects of antiangiogenic drugs on laser-induced choroidal neovascularization (CNV) in mice and other experimental animals. We have adapted the use of the Kowa Genesis Df Camera to perform Fundus Fluorescein Angiography (FFA) in mice. The 1 kg, 28 cm high camera has built-in barrier and exciter filters to allow digital FFA recording to a Compact Flash memory card. Furthermore, this handheld unit has a steady Indirect Lens Holder that firmly attaches to the main unit, that securely holds a 90 diopter lens in position, in order to facilitate appropriate focus and stability, for photographing the delicate central murine fundus. This easily portable fundus fluorescein camera can effectively record exceptional central retinal vascular detail in murine laser-induced CNV, while readily allowing the investigator to adjust the camera's position according to the variable head and eye movements that can randomly occur while the mouse is optimally anesthetized. This movable image recording device, with efficiencies of space, time, cost, energy and personnel, has enabled us to accurately document the alterations in the central choroidal and retinal vasculature following induction of CNV, implemented by argon-green laser photocoagulation and disruption of Bruch's Membrane, in the experimental murine model of exudative macular degeneration.

  9. Real Time Signal Processing and Data Handling with dedicated hardware in handheld OCT Device

    International Nuclear Information System (INIS)

    The manuscript presents the topics on real time signal processing with dedicated hardware presented at the INFIERI Summer School 2014. The focus of this work is on real-time signal processing, filtering and massive parallel computing. In general, medical devices have stringed demands on energy consumption as well as on data processing and handling. In fact, the development of novel medical devices has led to significant advances in fields such as instrumentation, algorithm development and image processing. In this manuscript, two aspects of the design are brought into consideration: the transformation of a conventional signal processing algorithm into an equivalent version that is suitable for hardware implementation and the use of on-chip modules originally developed for mass-electronics applications, for high speed data transmission. The development of a novel state-of-the-art hand-held OCT probe is used to exemplify theses aspects. In particular, the ''design process'' behind the implementation of a multichannel quadrature coherent demodulator is disclosed

  10. Evaluation of Handheld Assays for the Detection of Ricin and Staphylococcal Enterotoxin B in Disinfected Waters

    Directory of Open Access Journals (Sweden)

    Mary Margaret Wade

    2011-01-01

    Full Text Available Development of a rapid field test is needed capable of determining if field supplies of water are safe to drink by the warfighter during a military operation. The present study sought to assess the effectiveness of handheld assays (HHAs in detecting ricin and Staphylococcal Enterotoxin B (SEB in water. Performance of HHAs was evaluated in formulated tap water with and without chlorine, reverse osmosis water (RO with chlorine, and RO with bromine. Each matrix was prepared, spiked with ricin or SEB at multiple concentrations, and then loaded onto HHAs. HHAs were allowed to develop and then read visually. Limits of detection (LOD were determined for all HHAs in each water type. Both ricin and SEB were detected by HHAs in formulated tap water at or below the suggested health effect levels of 455 ng/mL and 4.55 ng/mL, respectively. However, in brominated or chlorinated waters, LODs for SEB increased to approximately 2,500 ng/mL. LODs for ricin increased in chlorinated water, but still remained below the suggested health effect level. In brominated water, the LOD for ricin increased to approximately 2,500 ng/mL. In conclusion, the HHAs tested were less effective at detecting ricin and SEB in disinfected water, as currently configured.

  11. Multi-frame elastography using a handheld force-controlled ultrasound probe.

    Science.gov (United States)

    Kuzmin, Andrey; Zakrzewski, Aaron M; Anthony, Brian W; Lempitsky, Victor

    2015-08-01

    We propose a new method for strain field estimation in quasi-static ultrasound elastography based on matching RF data frames of compressed tissues. The method benefits from using a handheld force-controlled ultrasound probe, which provides the contact force magnitude and therefore improves repeatability of displacement field estimation. The displacement field is estimated in a two-phase manner using triplets of RF data frames consisting of a pre-compression image and two post-compression images obtained with lower and higher compression ratios. First, a reliable displacement field estimate is calculated for the first post-compression frame. Second, we use this displacement estimate to warp the second post-compression frame while using linear elasticity to obtain an initial approximation. Final displacement estimation is refined using the warped image. The two-phase displacement estimation allows for higher compression ratios, thus increasing the practical resolution of the strain estimates. The strain field is computed from a displacement field using a smoothness- regularized energy functional, which takes into consideration local displacement estimation quality. The minimization is performed using an efficient primal-dual hybrid gradient algorithm, which can leverage the architecture of a graphical processing unit. The method is quantitatively evaluated using finite element simulations. We compute strain estimates for tissue-mimicking phantoms with known elastic properties and finally perform a qualitative validation using in vivo patient data. PMID:26276958

  12. A hand-held mosaicked multispectral imaging device for early stage pressure ulcer detection.

    Science.gov (United States)

    Qi, Hairong; Kong, Linghua; Wang, Chao; Miao, Lidan

    2011-10-01

    The use of a custom filter mosaic overlaying a CMOS/CCD sensor represents a novel idea to multispectral imaging. The innovation provides simple, miniaturized, low cost instrumentation that has many potential biological applications which require a hand-held detector. This makes it extremely adaptable and can serve as an integrated component to distributed diagnosis and home healthcare (D2H2). A mosaicked sensor is a monolithic array of many sensors, arranged in a geometric pattern with each sensor covered by an optical filter sensitive to a specified wavelength. In this way, only one spectral component is sensed at each pixel and the other spectral components must be estimated from neighbors. Although with great potential, one challenge faced by this device, however, is the reconstruction of the high-resolution full-spectral image from the low-resolution input. Due to the physical limitations in fabrication and the usage of the multispectral filter mosaic, two types of degradations exist, including filter misalignment and the missing spectral components, that must be corrected using intelligent algorithms to take full advantage of the hardware capability of the device. In this paper, we first describe a custom geometric correction method to restore the image from the misalignment distortion. We then present a binary tree-based generic demosaicking algorithm to efficiently estimate the missing special components and reconstruct a high-resolution full-spectral image. We choose early detection of pressure ulcer as a targeting area as early stage pressure ulcers and other subcutaneous lesions are nearly invisible in clinical settings, particularly so for dark pigmented skin. We show how the geometric correction and demosaicking algorithms successfully reconstruct a full-spectral image from which apparent contrast enhancement between damaged skin and the normal skin is observed. PMID:20703688

  13. Utility of hand-held echocardiography in outpatient pediatric cardiology management.

    Science.gov (United States)

    Riley, Alan; Sable, Craig; Prasad, Aparna; Spurney, Christopher; Harahsheh, Ashraf; Clauss, Sarah; Colyer, Jessica; Gierdalski, Marcin; Johnson, Ashley; Pearson, Gail D; Rosenthal, Joanna

    2014-12-01

    Adult patient series have shown hand-held echocardiography (echo) units (HHE) to be accurate for rapid diagnosis and triage. This is the first study to evaluate the ability of HHE to inform decision making in outpatient pediatric cardiology. New pediatric cardiology patients in outpatient clinics staffed by six pediatric cardiologists (experience 1-17 years) were prospectively enrolled if an echocardiogram (echo) was ordered during their initial visit. After history and physical examination and before a standard echo, the cardiologists performed a bedside HHE examination (GE Vscan 1.7-3.8 MHz), documented findings, and made a clinical decision. Diagnoses and decisions based on HHE were compared with final management after the standard echo. The study enrolled 101 subjects (ages 9 days to 19 years). The cardiologists considered HHE imaging adequate for decision making for 80 of the 101 subjects. For 77 of the 80 subjects with acceptable HHE imaging (68/68 normal and 9/12 abnormal standard echoes), the HHE-based primary diagnoses and decisions agreed with the final management. The sensitivity of HHE was 75 % (95 % confidence interval [CI] 43-94 %) and the positive predictive value 100 % (95 % CI 66-100 %) for pediatric heart disease. The agreement between standard echocardiography and HHE imaging was substantial (κ = 0.82). Excluding one of the least experienced cardiologists, HHE provided the basis for correct cardiac diagnoses and management for all the subjects with acceptable HHE imaging (58/58 normal and 9/9 abnormal echoes). In outpatient pediatric cardiology, HHE has potential as a tool to complement physical examination. Further investigation is needed to evaluate how value improves with clinical experience.

  14. Analysis of spectra from portable handheld gamma-ray spectrometry for terrain comparative assessment.

    Science.gov (United States)

    Dias, Flávio; Lima, Marco; Sanjurjo-Sánchez, Jorge; Alves, Carlos

    2016-04-01

    Geological characteristics can have impacts on societal development by, e.g., geotechnical issues and radiological hazard levels. Due to urban sprawl, there is an increasing need for detailed geological assessment. In this work are analysed data from portable handheld gamma-ray spectra (K, eU and eTh) obtained in granitic and Silurian metaclastic outcrops as well as in an profile, roughly N-S, on soil covered terrains transecting a mapped contact between these rock types (the profile's northern extremity is at locations mapped as granite). Estimations from gamma-ray spectra were studied by univariate and multivariate analyses. K, eU and eTh values were higher on granite in relation to Silurian metaclastic rocks. The northern extremity of the profile showed clearly higher contents of eTh and this contrast was supported by univariate statistical tools (normality plot and Wilk-Shapiro test; boxplots). A ternary plot with the contribution of the elements to gamma-ray absorbed dose showed the separation of granite from Silurian metaclastic rocks with the former being nearer the eTh vertex. The points in the northern extremity of the profile are nearer the eTh vertex than the other points on the profile. These visual suggestions were supported by hierarchical cluster analysis, which was able to differentiate between granite and metaclastic outcrops and separate portions of the profile located on different terrains. Portable gamma-ray spectrometry showed, hence, the potential to distinguish granite and metaclastic terrains at a scale useful for engineering works. These results can also be useful for a first comparative zoning of radiological hazards (which are higher for granite). PMID:26867098

  15. Strength Measurements in Acute Hamstring Injuries: Intertester Reliability and Prognostic Value of Handheld Dynamometry.

    Science.gov (United States)

    Reurink, Gustaaf; Goudswaard, Gert Jan; Moen, Maarten H; Tol, Johannes L; Verhaar, Jan A N; Weir, Adam

    2016-08-01

    Study Design Cohort study, repeated measures. Background Although hamstring strength measurements are used for assessing prognosis and monitoring recovery after hamstring injury, their actual clinical relevance has not been established. Handheld dynamometry (HHD) is a commonly used method of measuring muscle strength. The reliability of HHD has not been determined in athletes with acute hamstring injuries. Objectives To determine the intertester reliability and the prognostic value of hamstring HHD strength measurement in acute hamstring injuries. Methods We measured knee flexion strength with HHD in 75 athletes at 2 visits, at baseline (within 5 days of hamstring injury) and follow-up (5 to 7 days after the baseline measurement). We assessed isometric hamstring strength in 15° and 90° of knee flexion. Reliability analysis testing was performed by 2 testers independently at the follow-up visit. We recorded the time needed to return to play (RTP) up to 6 months following baseline. Results The intraclass correlation coefficients of the strength measurements in injured hamstrings were between 0.75 and 0.83. There was a statistically significant but weak correlation between the time to RTP and the strength deficit at 15° of knee flexion measured at baseline (Spearman r = 0.25, P = .045) and at the follow-up visit (Spearman r = 0.26, P = .034). Up to 7% of the variance in time to RTP is explained by this strength deficit. None of the other strength variables were significantly correlated with time to RTP. Conclusion Hamstring strength can be reliably measured with HHD in athletes with acute hamstring injuries. The prognostic value of strength measurements is limited, as there is only a weak association between the time to RTP and hamstring strength deficit after acute injury. Level of Evidence Prognosis, level 4. J Orthop Sports Phys Ther 2016;46(8):689-696. Epub 12 May 2016. doi:10.2519/jospt.2016.6363. PMID:27170527

  16. Novel handheld x-ray fluorescence spectrometer for routine testing for the presence of lead

    Science.gov (United States)

    Rensing, Noa M.; Tiernan, Timothy C.; Squillante, Michael R.

    2011-06-01

    RMD is developing a safe, inexpensive, and easy to operate lead detector for retailers and consumers that can reliably detect dangerous levels of lead in toys and other household products. Lead and its compounds have been rated as top chemicals that pose a great threat to human health. However, widespread testing for environmental lead is rarely undertaken until lead poisoning has already been diagnosed. The problem is not due to the accuracy or sensitivity of existing lead detection technology, but rather to the high expense, safety and licensing barriers of available test equipment. An inexpensive and easy to use lead detector would enable the identification of highly contaminated objects and areas and allow for timely and cost effective remediation. The military has similar needs for testing for lead and other heavy elements such as mercury, primarily in the decontamination of former military properties prior to their return to civilian use. RMD's research and development efforts are abased on advanced solid-state detectors combined with recently patented lead detection techniques to develop a consumer oriented lead detector that will be widely available and easy and inexpensive to use. These efforts will result in an instrument that offers: (1) high sensitivity, to identify objects containing dangerous amounts of lead, (2) low cost to encourage widespread testing by consumers and other end users and (3) convenient operation requiring no training or licensing. In contrast, current handheld x-ray fluorescence spectrometers either use a radioactive source requiring licensing and operating training, or use an electronic x-ray source that limits their sensitivity to surface lead.

  17. Group differences in physician responses to handheld presentation of clinical evidence: a verbal protocol analysis

    Directory of Open Access Journals (Sweden)

    Pavlovic Nada J

    2007-07-01

    Full Text Available Abstract Background To identify individual differences in physicians' needs for the presentation of evidence resources and preferences for mobile devices. Methods Within-groups analysis of responses to semi-structured interviews. Interviews consisted of using prototypes in response to task-based scenarios. The prototypes were implemented on two different form factors: a tablet style PC and a pocketPC. Participants were from three user groups: general internists, family physicians and medicine residents, and from two different settings: urban and semi-urban. Verbal protocol analysis, which consists of coding utterances, was conducted on the transcripts of the testing sessions. Statistical relationships were investigated between staff physicians' and residents' background variables, self-reported experiences with the interfaces, and verbal code frequencies. Results 47 physicians were recruited from general internal medicine, family practice clinics and a residency training program. The mean age of participants was 42.6 years. Physician specialty had a greater effect on device and information-presentation preferences than gender, age, setting or previous technical experience. Family physicians preferred the screen size of the tablet computer and were less concerned about its portability. Residents liked the screen size of the tablet, but preferred the portability of the pocketPC. Internists liked the portability of the pocketPC, but saw less advantage to the large screen of the tablet computer (F[2,44] = 4.94, p = .012. Conclusion Different types of physicians have different needs and preferences for evidence-based resources and handheld devices. This study shows how user testing can be incorporated into the process of design to inform group-based customization.

  18. Moving a hand-held object: Reconstruction of referent coordinate and apparent stiffness trajectories.

    Science.gov (United States)

    Ambike, S; Zhou, T; Zatsiorsky, V M; Latash, M L

    2015-07-01

    This study used the framework of the referent configuration hypothesis and slow changes in the external conditions during vertical oscillation of a hand-held object to infer the characteristics of hypothetical control variables. The study had two main objectives: (1) to show that hypothetical control variables, namely, referent coordinates and apparent stiffness of vertical hand position and grip force can be measured in an experiment; and (2) to establish relation(s) between these control variables that yield the classic grip-force-load-force coupling. Healthy subjects gripped a handle and performed vertical oscillations between visual targets at one of five metronome-prescribed frequencies. A HapticMaster robot was used to induce slow changes in the vertical force applied to the handle, while the size of the handle was changed slowly leading to changes in the grip aperture. The subjects were instructed not to react to possible changes in the external forces. A linear, second-order model was used to reconstruct the referent coordinate and apparent stiffness values for each phase of the vertical oscillation cycle using across-cycle regressions. The reconstructed time profiles of the referent coordinates and apparent stiffness showed consistent trends across subjects and movement frequencies. To validate the method, these values were used to predict the vertical force and the grip force applied to the handle for movement cycles that were not utilized in the reconstruction process. Analysis of the coupling between the four variables, two referent coordinates and two apparent stiffness values, revealed a single strong constraint reflecting the coupling between the grip force and vertical force. We view these data as providing experimental support for the idea of controlling natural, multi-muscle actions with shifts in a low-dimensional set of referent coordinates.

  19. 嵌入式掌上娱乐系统%Embedded Handheld Entertainment System

    Institute of Scientific and Technical Information of China (English)

    霍崇浩; 郝卫东; 蒋杰

    2012-01-01

    在UP-TECH S3C2410 DVK1.1开发平台下,设计并实现了一个触摸式的嵌入式掌上娱乐系统.本系统主要包括多媒体播放器和游戏的基本功能.本系统可以播放现有的大多数的音频视频文件;设计了嵌入式游戏,增加了系统的娱乐性.使用触摸屏方便作为人机交互的平台.采用跨平台性能良好的Qt4设计了应用程序和人机界面,界面友好,汉化显示,美观,操作简便,运行流畅.整个系统模块化设计,充分考虑了软件系统自身所占的存储空间以及可扩展性,具有广阔的市场前景.%The system realizes an embedded handheld entertainment system based on Linux in UP-TECH S3C2410 DVK1.1 development platform. The system includes multi-media player and game. This system can play most of the existing audio and video files. This paper designs an embedded game, and brings much entertaining to the system. It uses touch screen as man-machine interactive platform, bringing much convenience. Qt4 is used to design applications and friendly interactive interface which supports for Chinese display, beautiful, easy to handle, run smoothly. Considering the software system's storage space and expansibility, it has a broad market prospect to choose modular design in the whole system.

  20. Accuracy of Handheld Point-of-Care Fingertip Lactate Measurement in the Emergency Department

    Directory of Open Access Journals (Sweden)

    Gaieski, David G

    2013-02-01

    Full Text Available Introduction: Early recognition of elevated lactate levels in sepsis may hasten the detection of those patients eligible for aggressive resuscitation. Point-of-care (POC testing is now increasingly available for use in the emergency department (ED. We examined the accuracy and time-saving effect of a handheld POC device for the measurement of fingertip and whole blood lactate as compared with reference laboratory testing in critically ill ED patients.Methods: A convenience sample of adult ED patients receiving serum lactate testing was prospectively enrolled at an urban, tertiary care US hospital. Consenting patients underwent fingertip POC lactate measurement with a portable device and simultaneous whole blood sampling for analysis by both the POC device and standard laboratory analyzer (‘‘reference method’’. Lactate measurements were compared by intraclass correlation (ICC and Bland and Altman plots. Differences in time to test result were compared by paired t test.Results: Twenty-four patients, 19 (79% with sepsis and 21 (88% with lactate levels below 4 mmol/L, were included from April 2005 to May 2005. Fingertip POC and whole blood POC lactate measurements each correlated tightly with the reference method (ICC ¼ 0.90 and ICC ¼ 0.92, respectively. Mean time between obtaining fingertip lactate samples and whole blood reference lactate samples was 8 6 13 minutes. Mean time between obtaining POC and reference laboratory lactate results was 65 minutes (95% confidence interval, 30–103.Conclusion: Fingertip POC lactate measurement is an accurate method to determine lactate levels in infected ED patients with normal or modestly elevated lactate values and significantly decreases time to test results. These findings should be verified in a larger, more critically ill, ED population. [West J Emerg Med. 2013;14(1:58-62.

  1. Radioisotope guided surgery with imaging probe, a hand-held high-resolution gamma camera

    International Nuclear Information System (INIS)

    Since 1997, our group of Physics together with Nuclear Physicians studies imaging probes (IP), hand-held, high-resolution gamma cameras for radio-guided surgery (RGS). Present work is aimed to verify the usefulness of two updated IP in different surgical operations. Forty patients scheduled for breast cancer sentinel node (SN) biopsy, five patients with nodal recurrence of thyroid cancer, seven patients with parathyroid adenomas, five patients with neuroendocrine tumours (NET), were operated under the guide of IP. We used two different IP with field of view of 1 and 4 in.2, respectively and intrinsic spatial resolution of about 2 mm. Radioisotopes were 99mTc, 123I and 111In. The 1 in.2 IP detected SN in all the 40 patients and more than one node in 24, whereas anger camera (AC) failed locating SN in four patients and detected true positive second nodes in only nine patients. The 4 in.2 IP was used for RGS of thyroid, parathyroid and NETs. It detected eight latero-cervical nodes. In the same patients, AC detected five invaded nodes. Parathyroid adenomas detected by IP were 10 in 7 patients, NET five in five patients. One and 4 in.2 IPs showed usefulness in all operations. Initial studies on SN biopsy were carried out on small series of patients to validate IP and to demonstrate the effectiveness and usefulness of IP alone or against conventional probes. We propose the use of the IP as control method for legal documentation and surgeon strategy guide before and after lesion(s) removal

  2. 基于FPGA的手持式示波器设计%Design of handheld oscilloscope based on FPGA

    Institute of Scientific and Technical Information of China (English)

    王庆春; 何晓燕

    2013-01-01

      在此设计的低成本手持式示波器是以ADC128S022模/数转换芯片为数据采集前端;使用FPGA片内双口内建RAM进行数据存储、有限状态机实现示波器的触发控制和显示驱动;最后再用LCD12864液晶模块完成终端的低成本图形显示。在DE0⁃Nano FPGA(Altera Cyclone IV)开发板上的测试结果表明,所设计的手持式示波器可以实现模拟信号任意电平上升沿或下降沿的触发测量;垂直灵敏度和扫描速度调节、波形参数的直接读出等功能。%The analog⁃to⁃digital conversion chip ADC128S022 is taken as the data acquisition front⁃end in the design pro⁃cess of low⁃cost handheld oscilloscope. The FPGA on⁃chip dual⁃port RAM is used for data storage. A finite state machine is em⁃ployed to achieve the trigger control and display driver of the handheld oscilloscope. The LCD module LCD12864 is used to com⁃plete the low⁃cost terminal graphics display. Moreover,the results testing on the DE0⁃Nano FPGA(Altera Cyclone IV)develop⁃ment board show that the low⁃cost handheld oscilloscope can realize the functions of trigger measurement,vertical sensitivity ad⁃justment,scan speed adjustment and direct readout of waveform parameters at analog signal rising edge or falling edge at any electric level.

  3. Development of a handheld widefield hyperspectral imaging (HSI) sensor for standoff detection of explosive, chemical, and narcotic residues

    Science.gov (United States)

    Nelson, Matthew P.; Basta, Andrew; Patil, Raju; Klueva, Oksana; Treado, Patrick J.

    2013-05-01

    The utility of Hyper Spectral Imaging (HSI) passive chemical detection employing wide field, standoff imaging continues to be advanced in detection applications. With a drive for reduced SWaP (Size, Weight, and Power), increased speed of detection and sensitivity, developing a handheld platform that is robust and user-friendly increases the detection capabilities of the end user. In addition, easy to use handheld detectors could improve the effectiveness of locating and identifying threats while reducing risks to the individual. ChemImage Sensor Systems (CISS) has developed the HSI Aperio™ sensor for real time, wide area surveillance and standoff detection of explosives, chemical threats, and narcotics for use in both government and commercial contexts. Employing liquid crystal tunable filter technology, the HSI system has an intuitive user interface that produces automated detections and real-time display of threats with an end user created library of threat signatures that is easily updated allowing for new hazardous materials. Unlike existing detection technologies that often require close proximity for sensing and so endanger operators and costly equipment, the handheld sensor allows the individual operator to detect threats from a safe distance. Uses of the sensor include locating production facilities of illegal drugs or IEDs by identification of materials on surfaces such as walls, floors, doors, deposits on production tools and residue on individuals. In addition, the sensor can be used for longer-range standoff applications such as hasty checkpoint or vehicle inspection of residue materials on surfaces or bulk material identification. The CISS Aperio™ sensor has faster data collection, faster image processing, and increased detection capability compared to previous sensors.

  4. Feasibility of using hand-held isotope identifiers for attribute testing of radioactive sources in shipment containers

    International Nuclear Information System (INIS)

    The project 'Feasibility of using hand-held isotope identifiers for attribute testing of radioactive sources in shipment containers' was being carried out in the framework of IAEA Research Contract no. 12444/Nuclear Security Multi-donors Fund by Russian Research Center 'Kurchatov Institute' from March 15, 2003, till May 31, 2006. The scope of work included: 1. Analysis of technical characteristics of hand-held isotope identifiers with respect to the determination of transport index and the verification of shielded sources. 2. Establishing the list of most frequently shipped radioactive sources and nuclear materials. 3. Analysis the design information of standard, approved shipping containers used for the transportation of nuclear materials and radioactive substances 4. Performing test measurements on various containers using hand-held devices. Assessment of performance of the devices with respect to the scope of the project and draw conclusions with respect to the technical feasibility of: - Confirmation of transport index of nuclear and radioactive materials shipped in various shipping packaging containers; - Identification of nuclear and radioactive materials shipped in various shipping packaging containers; - Definition of isotopic composition of gamma nuclides in their various combinations The results of the project execution are as follows: 1. The information on the most frequently shipped radioactive sources and nuclear materials and design of standard shipping containers for the transportation of nuclear materials and radioactive substances was systemized; 2. The spectrometric analysis of most frequently shipped isotopes was carried out; 3. The spectrometer capabilities were verified in terms of the definition of isotopic composition of gamma nuclides in their various combinations; 4. The spectrometer capabilities were verified in terms of the definition of isotopic composition of gamma nuclides when placed in various protective containers. 5. The

  5. CORRELATION INVESTIGATION BETWEEN CONTACT APPROACH SPEED OF HANDHELD METAL ROD AND DISCHARGE PARAMETERS FROM CHARGED HUMAN BODY

    Institute of Scientific and Technical Information of China (English)

    Ruan Fangming; Fujiwara Osamu; Gao Yougang

    2008-01-01

    Characteristic measurement of contact discharge currents are made through a hand-held metal rod from charged human body. Correlation coefficients are obtained, through Statistic Package for Social Science (SPSS), for various charge voltages, which is based on the effect test of electrode contact approach speeds on discharge current parameters of current peaks, maximum rising slope and spark lengths. Discharge parameters at charge voltage 300V are independent on approach speed. For charge voltages equal to and higher than 500V, the contact approach speed has strong positive correlation with discharge parameters of the peak current and the maximum rising slope, whereas has strong negative correlation with the spark length.

  6. Evaluating Handheld X-Ray Fluorescence (XRF) Technology in Planetary Exploration: Demonstrating Instrument Stability and Understanding Analytical Constraints and Limits for Basaltic Rocks

    Science.gov (United States)

    Young, K. E.; Hodges, K. V.; Evans, C. A.

    2012-01-01

    While large-footprint X-ray fluorescence (XRF) instruments are reliable providers of elemental information about geologic samples, handheld XRF instruments are currently being developed that enable the collection of geochemical data in the field in short time periods (approx.60 seconds) [1]. These detectors are lightweight (1.3kg) and can provide elemental abundances of major rock forming elements heavier than Na. While handheld XRF detectors were originally developed for use in mining, we are working with commercially available instruments as prototypes to explore how portable XRF technology may enable planetary field science [2,3,4]. If an astronaut or robotic explorer visited another planetary surface, the ability to obtain and evaluate geochemical data in real-time would be invaluable, especially in the high-grading of samples to determine which should be returned to Earth. We present our results on the evaluation of handheld XRF technology as a geochemical tool in the context of planetary exploration.

  7. Evaluation of cone function by a handheld non-mydriatic flicker electroretinogram device

    Directory of Open Access Journals (Sweden)

    Nakamura N

    2016-06-01

    Full Text Available Natsuko Nakamura,1 Kaoru Fujinami,1 Yoshinobu Mizuno,2 Toru Noda,2 Kazushige Tsunoda11Laboratory of Visual Physiology, Division of Vision Research, National Institute of Sensory Organs, 2Department of Ophthalmology, National Hospital Organization, National Tokyo Medical Center, Tokyo, JapanPurpose: Full-field electroretinograms (ERGs are used to evaluate retinal function in patients with various types of hereditary and acquired retinal diseases. However, ERG recordings require relatively invasive procedures, including pupillary dilation and the use of contact lens electrodes. Thus, it would be helpful to have a simpler and noninvasive screening method. The purpose of this study was to determine whether a new, handheld, portable ERG device, RETeval™, can be used to screen patients for cone dysfunction.Patients and methods: Thirty-five eyes of 35 patients who had reduced cone responses ascertained by a conventional ERG system using contact lens electrodes were studied. The causative diseases included achromatopsia, cone dystrophy, cone-rod dystrophy, retinitis pigmentosa, choroidal dystrophy, autoimmune retinopathy, and Stargardt disease. The flicker ERGs were recorded with the RETeval™ under undilated conditions with skin electrodes (stimulus strength, 3.0 cd·s/m2; frequency, 28.3 Hz, and the responses were compared to that of 50 healthy eyes. The amplitudes and implicit times of the fundamental component of the flicker ERGs were analyzed in three age groups: Group A, ≤20 years; Group B, 21–40 years; and Group C, ≥41 years.Results: In all of the age groups, the amplitudes of the ERGs were significantly smaller and the implicit times significantly longer in patients with cone dysfunction than in the control eyes. All but one of the patients had flicker amplitudes lower than the mean −2.0 standard deviation of control eyes.Conclusion: The RETeval™ has a potential of being used to screen for cone dysfunction. The entire examination

  8. Assessment of nickel and cobalt release from 200 unused hand-held work tools for sale in Denmark — Sources of occupational metal contact dermatitis?

    DEFF Research Database (Denmark)

    Thyssen, Jacob P.; Jensen, Peter; Lidén, Carola;

    2011-01-01

    IntroductionNickel and cobalt allergy remain frequent in dermatitis patients. It is important to determine possible nickel and cobalt exposures at work as these may offer important information to regulators and physicians who perform patch testing. Clinical relevance of metal exposure is usually...... assessed by the treating physician via the medical history and by presentation of allergic contact dermatitis. ObjectivesTo screen unused non-powered hand-held work tools for nickel and cobalt release by using colorimetric spot tests. Materials & methodsA random selection of 200 non-powered hand-held work...... may explain the relatively high levels of cobalt allergy in dermatitis patients....

  9. Raman spectroscopic identification of arsenate minerals in situ at outcrops with handheld (532 nm, 785 nm) instruments.

    Science.gov (United States)

    Culka, Adam; Kindlová, Helena; Drahota, Petr; Jehlička, Jan

    2016-02-01

    Minerals are traditionally identified under field conditions by experienced mineralogists observing the basic physical properties of the samples. Under laboratory conditions, a plethora of techniques are commonly used for identification of the geological phases based on their structural and spectroscopic parameters. In this area, Raman spectrometry has become a useful tool to complement the more widely applied XRD. Today, however, there is an acute need for a technique for unambiguous in situ identification of minerals, within the geological as well as planetary/exobiology realms. With the potential for miniaturization, Raman spectroscopy can be viewed as a practical technique to achieve these goals. Here, for the first time, the successful application of handheld Raman spectrometers is demonstrated to detect and discriminate arsenic phases in the form of earthy aggregates. The Raman spectroscopic analyses of arsenate minerals were performed in situ using two handheld instruments, using 532 and 785 nm excitation. Bukovskýite, kaňkite, parascorodite, and scorodite were identified from Kaňk near Kutná Hora, CZE; kaňkite, scorodite, and zýkaite were identified at the Lehnschafter gallery in an old silver mine at Mikulov near Teplice, Bohemian Massif, CZE. PMID:26523686

  10. Evaluation of 2 electronic handheld devices for diagnosis of ketonemia and glycemia in dairy goats.

    Science.gov (United States)

    Pichler, M; Damberger, A; Arnholdt, T; Schwendenwein, I; Gasteiner, J; Drillich, M; Iwersen, M

    2014-12-01

    The objective of this study was to evaluate the suitability of the electronic handheld devices FreeStyle Precision (FSP; Abbott Germany, Wiesbaden, Germany) and GlucoMen LX Plus (GML; A. Menarini GmbH, Vienna, Austria) for the measurement of β-hydroxybutyrate (BHBA) in whole blood in dairy goats. Additionally, glucose concentration was analyzed with the FSP device. For method comparison, the samples were also analyzed in the laboratory by standard methods, which served as the gold standard in our study. A further objective was to evaluate the agreement between samples obtained by minimal invasive venipuncture of an ear vein and measurements of whole blood samples from the jugular vein (vena jugularis). In total, 173 blood sample pairs collected from 28 goats were obtained from an ear vein and from the jugular vein. The Spearman correlation coefficients (rsp) for BHBA concentrations determined with the FSP or GML and the gold standard were 0.95 and 0.85 for the ear vein and 0.98 and 0.88 for the jugular vein, respectively. Bland-Altman plots of differences showed a positive bias of 0.12 (ear vein) and 0.21 (jugular vein) when determination was performed with the FSP and a negative bias of 0.21 (ear vein) and 0.24 (jugular vein) when using the GML. For the FSP, applying the adjusted thresholds determined by ROC analysis of 0.9 (ear vein) and 1.0 mmol/L (jugular vein) allowed to distinguish between healthy goats and animals with hyperketonemia with sensitivities (Se) and specificities (Sp) for samples from the ear vein of 0.98 and 0.85, and from the jugular vein of 0.99 and 0.94, respectively. For the GML, adjusted thresholds were 0.5 mmol/L for the ear vein (Se=0.94, Sp=0.75) and 0.6 mmol/L for the jugular vein (Se=0.88, Sp=0.91). Repeated analyses of defined whole blood samples showed average inter- and intraassay coefficients of variation of 6.6 and 7.3% for FSP, and of 35.6 and 35.4% for GML, respectively. Test characteristics for determining glucose

  11. An Examination of Hand-Held Computer-Assisted Instruction on Subtraction Skills for Second Grade Students with Learning and Behavioral Disabilities

    Science.gov (United States)

    Nordness, Philip D.; Haverkost, Ann; Volberding, Annette

    2011-01-01

    The effect of a mathematic flashcard application on a hand-held computing device was examined across three individual second grade students with learning and behavioral disabilities. All of the students improved their subtraction scores by an average of 17% as measured by the district-created, curriculum-based assessment. The results of this study…

  12. Inter-Tester Reliability and Precision of Manual Muscle Testing and Hand-Held Dynamometry in Lower Limb Muscles of Children with Spina Bifida

    Science.gov (United States)

    Mahony, Kate; Hunt, Adrienne; Daley, Deborah; Sims, Susan; Adams, Roger

    2009-01-01

    Reliability and measurement precision of manual muscle testing (MMT) and hand-held dynamometry (HHD) were compared for children with spina bifida. Strength measures were obtained of the hip flexors, hip abductors, and knee extensors of 20 children (10 males, 10 females; mean age 9 years 10 months; range: 5 to 15 years) by two experienced physical…

  13. Beyond Textbook Illustrations: Hand-Held Models of Ordered DNA and Protein Structures as 3D Supplements to Enhance Student Learning of Helical Biopolymers

    Science.gov (United States)

    Jittivadhna, Karnyupha; Ruenwongsa, Pintip; Panijpan, Bhinyo

    2010-01-01

    Textbook illustrations of 3D biopolymers on printed paper, regardless of how detailed and colorful, suffer from its two-dimensionality. For beginners, computer screen display of skeletal models of biopolymers and their animation usually does not provide the at-a-glance 3D perception and details, which can be done by good hand-held models. Here, we…

  14. Estimation of Potential Gradient from Discharge Current through Hand-Held Metal Piece from Charged Human Body

    Science.gov (United States)

    Taka, Yoshinori; Fujiwara, Osamu

    Electrostatic discharge (ESD) events due to metal objects electrified with low voltages give a fatal electromagnetic interference to high-tech information equipment. In order to elucidate the mechanism, with a 6-GHz digital oscilloscope, we previously measured the discharge current due to collision of a hand-held metal piece from a charged human body, and gave a current calculation model. In this study, based on the calculation model, a method was presented for deriving a gap potential gradient from the measured discharge current. Measurements of the discharge currents were made for charge voltages from 200V to 1000V. The corresponding potential gradients were estimated, which were validated in comparison with an empirical formula based on the Paschen's law together with other researcher's experimental results.

  15. Pre-test habituation improves the reliability of a handheld test of mechanical nociceptive threshold in dairy cows

    DEFF Research Database (Denmark)

    Raundal, P. M.; Andersen, P. H.; Toft, Nils;

    2015-01-01

    Mechanical nociceptive threshold (MNT) testing has been used to investigate aspects of painful states in bovine claws. We investigated a handheld tool, where the applied stimulation force was monitored continuously relative to a pre-encoded based target force. The effect on MNT of two pre......-testing habituation procedures was performed in two different experiments comprising a total of 88 sound Holsteins dairy cows kept either inside or outside their home environment. MNT testing was performed using five consecutive mechanical nociceptive stimulations per cow per test at a fixed pre-encoded target rate...... of 2.1 N/s. The habituation procedure performed in dairy cows kept in their home environment led to lowered intra-individual coefficient of variation of MNT (P force during stimulations (P

  16. 手持式快速心电检测仪设计%The Design of Handheld Fast ECG Detector

    Institute of Scientific and Technical Information of China (English)

    石波; 张根选; 曹阳

    2013-01-01

    A new handheld fast ECG detector based on low gain amplifier, the high resolution analog to digital converter, the real-time digital filter, fast P-QRS-T wave detection and ion algorithm was designed. The results showed that the ECG detector can meet the requirements of fast detecting heart rate and ECG P-QRS-T waveforms.%  采用低倍数放大、高分辨率模数转换、实时数字滤波以及快速P-QRS-T波形识别和提取算法等技术,设计了一种手持式快速心电检测仪。结果表明,该心电检测仪能够满足心率和心电图P-QRS-T波形快速检测的要求。

  17. US-ROK Action Sheet 34: Safeguards Application of a Hand-held Mechanically Cooled Germanium Spectrometer

    Energy Technology Data Exchange (ETDEWEB)

    Dreyer, J. [Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Burks, M. [Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Ham, Y. [Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Kwak, S. [Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

    2015-10-20

    This report summarizes results of Action Sheet 34 - for the cooperative efforts on the field testing and evaluation of a high-resolution, hand-held, gamma-ray spectrometer, known as SPG (Spectroscopic Planar Germanium), for safeguards application such as short notice inspections, UF6 analysis, enrichment determination, and other potential applications. The Spectroscopic Planar Germanium (SPG) has been demonstrated IAEA Physical Inventory Verification (PIV) in South Korea. This field test was a success and the feedback provided by KINAC, IAEA, and national laboratory staff was used to direct efforts to improve the instrument this year. Key points in this report include measurement results from PIV, analysis of spectra with commercially available Ortec U235 and PC-FRAM, and completion of tripod and tungsten collimator and integration of user feedback.

  18. Demise of the checksheet: Using off-the-shelf miniature hand-held computers for remote fieldwork applications.

    Science.gov (United States)

    Whiten, A; Barton, R A

    1988-06-01

    Laboratory-based researchers have increasingly reaped the benefits of entering data directly into a computer; those concerned with behaviour often using specially designed keyboards. However, many ecologists and ethologists doing fieldwork in remote places have been reluctant to abandon paper checksheets because of worries about unreliability, lack of electrical supply and sheer weight of computer equipment, adding to more general drawbacks such as the need for considerable expertise in purpose-built hardware and software. Having used commercially available hand-held computers extensively for our own fieldwork on baboons in Africa, we are confident that these worries are unfounded. As some researchers have already discovered, field computerization is not something to be distrusted, but in fact offers several important benefits. PMID:21227187

  19. Analysis of pre-Islamic ceramics from the Kur River Basin (Fars, Iran) using handheld X-ray fluorescence spectrometry

    Science.gov (United States)

    Pincé, Possum; Vekemans, Bart; Vandenabeele, Peter; Haerinck, Ernie; Overlaet, Bruno

    2016-09-01

    A large number of painted pre-Islamic ceramics from the Kur River Basin (Fars province, Iran) was collected on surveys and excavations conducted by the late Prof. L. Vanden Berghe (Ghent University, Belgium) during the 1950s. Handheld X-ray fluorescence spectrometry was undertaken on a selection of these ceramics to evaluate the applicability of the technique to study the fabric of these ceramics and the pigments used for decoration. The aim is to obtain elemental data, from which information about raw materials, manufacturing techniques and exchange systems can be extracted. A total of 26 sherds was analyzed dating from the Neolithic to the Late Bronze Age and belonging to different sites and styles. Five compositional groups could be identified in the dataset. These elemental groups differ from the groups obtained by the macroscopic study and are related to the production process and/or the provenance of the primary materials.

  20. Ways of Walking: Understanding Walking's Implications for the Design of Handheld Technology Via a Humanistic Ethnographic Approach

    Directory of Open Access Journals (Sweden)

    Parisa Eslambolchilar

    2016-01-01

    Full Text Available It seems logical to argue that mobile computing technologies are intended for use "on-the-go." However, on closer inspection, the use of mobile technologies pose a number of challenges for users who are mobile, particularly moving around on foot. In engaging with such mobile technologies and their envisaged development, we argue that interaction designers must increasingly consider a multitude of perspectives that relate to walking in order to frame design problems appropriately. In this paper, we consider a number of perspectives on walking, and we discuss how these may inspire the design of mobile technologies. Drawing on insights from non-representational theory, we develop a partial vocabulary with which to engage with qualities of pedestrian mobility, and we outline how taking more mindful approaches to walking may enrich and inform the design space of handheld technologies

  1. Development of a handheld sensor system system for the online measurement of hydrogen peroxide in aseptic filling systems

    Energy Technology Data Exchange (ETDEWEB)

    Reisert, Steffen; Schoening, Michael J. [Institute of Nano- and Biotechnologies, Aachen University of Applied Sciences, Juelich (Germany); Henkel, Hartmut; Schneider, Andreas; Schaefer, Daniel [von Hoerner and Sulger GmbH, Schwetzingen (Germany); Friedrich, Peter [Aseptiksysteme and Foodtechnologie, Linnich (Germany); Berger, Joerg [Filldesign GmbH, Moenchengladbach (Germany)

    2010-04-15

    A handheld sensor system for the online measurement of hydrogen peroxide (H{sub 2}O{sub 2}) in aseptic sterilisation processes has been developed. It is based on a calorimetric-type gas sensor that consists of a differential set-up of two temperature sensors, of which one is catalytically activated and the second one is passivated and used as reference. The sensor principle relies in detecting a rise in temperature on the active sensor due to the exothermic reaction of H{sub 2}O{sub 2} on the catalytic surface. To characterise the sensor system towards H{sub 2}O{sub 2} sensitivity and other influencing factors, measurements have been carried out both at an experimental set-up and a manufacturer's sterilisation machine. Physical sensor characterisation was done by means of the optical microscopy. (Abstract Copyright [2010], Wiley Periodicals, Inc.)

  2. Hand-held multi-DOF robotic forceps for neurosurgery designed for dexterous manipulation in deep and narrow space.

    Science.gov (United States)

    Okubo, Takuro; Harada, Kanako; Fujii, Masahiro; Tanaka, Shinichi; Ishimaru, Tetsuya; Iwanaka, Tadashi; Nakatomi, Hirohumi; Sora, Sigeo; Morita, Akio; Sugita, Naohiko; Mitsuishi, Mamoru

    2014-01-01

    Neurosurgical procedures require precise and dexterous manipulation of a surgical suture in narrow and deep spaces in the brain. This is necessary for surgical tasks such as the anastomosis of microscopic blood vessels and dura mater suturing. A hand-held multi-degree of freedom (DOF) robotic forceps was developed to aid the performance of such difficult tasks. The diameter of the developed robotic forceps is 3.5 mm, and its tip has three DOFs, namely, bending, rotation, and grip. Experimental results showed that the robotic forceps had an average needle insertion force of 1.7 N. Therefore, an increase in the needle insertion force is necessary for practical application of the developed device.

  3. A new miniature hand-held solar-blind reagentless standoff chemical, biological, and explosives (CBE) sensor

    Science.gov (United States)

    Hug, W. F.; Reid, R. D.; Bhartia, R.; Lane, A. L.

    2008-04-01

    Improvised explosive devices (IEDs), vehicle-borne improvised explosive devices (VBIEDs), and suicide bombers are a major threat to many countries and their citizenry. The ability to detect trace levels of these threats with a miniature, hand-held, reagentless, standoff sensor represents a major improvement in the state of the art of CBE surface sensors. Photon Systems, Inc., in collaboration with Jet Propulsion Laboratory, recently demonstrated a new technology hand-held sensor for reagentless, close-range, standoff detection and identification of trace levels CBE materials on surfaces. This targeted ultraviolet CBE (TUCBE) sensor is the result of an Army Phase I STTR program. The resulting 5lb, 5W, flashlight-sized sensor can discriminate CBE from background materials using a combination of deep UV excited resonance Raman (RR) and laser induced native fluorescence (LINF) emissions resulting from excitation by a new technology deep UV laser. Detection and identification is accomplished in less than 1ms. Standoff excitation of suspicious packages, vehicles, persons, and other objects that may contain hazardous materials is accomplished using wavelengths below 250nm where Raman and native fluorescence emissions occupy distinctly different wavelength regions. This enables simultaneous detection of RR and LINF emissions with no interferences. The sensor employs fused RR/LINF chemometric methods to extract the identity of targeted materials from background clutter. Photon Systems has demonstrated detection and identification of 100ng/cm2 of explosives materials at a distance of 1 meter using a sensor with 3.8 cm optical aperture. Expansion of the optical aperture to 38 cm in a lantern-sized sensor will enable similar detection and identification of CBE materials at standoff distances of 10 meters. As a result of excitation and detection in the deep UV and the use of a gated detection system, the sensor is solar blind and can operate in full daylight conditions.

  4. Assessment of Lower Limb Muscle Strength and Power Using Hand-Held and Fixed Dynamometry: A Reliability and Validity Study.

    Directory of Open Access Journals (Sweden)

    Benjamin F Mentiplay

    Full Text Available Hand-held dynamometry (HHD has never previously been used to examine isometric muscle power. Rate of force development (RFD is often used for muscle power assessment, however no consensus currently exists on the most appropriate method of calculation. The aim of this study was to examine the reliability of different algorithms for RFD calculation and to examine the intra-rater, inter-rater, and inter-device reliability of HHD as well as the concurrent validity of HHD for the assessment of isometric lower limb muscle strength and power.30 healthy young adults (age: 23±5 yrs, male: 15 were assessed on two sessions. Isometric muscle strength and power were measured using peak force and RFD respectively using two HHDs (Lafayette Model-01165 and Hoggan microFET2 and a criterion-reference KinCom dynamometer. Statistical analysis of reliability and validity comprised intraclass correlation coefficients (ICC, Pearson correlations, concordance correlations, standard error of measurement, and minimal detectable change.Comparison of RFD methods revealed that a peak 200 ms moving window algorithm provided optimal reliability results. Intra-rater, inter-rater, and inter-device reliability analysis of peak force and RFD revealed mostly good to excellent reliability (coefficients ≥ 0.70 for all muscle groups. Concurrent validity analysis showed moderate to excellent relationships between HHD and fixed dynamometry for the hip and knee (ICCs ≥ 0.70 for both peak force and RFD, with mostly poor to good results shown for the ankle muscles (ICCs = 0.31-0.79.Hand-held dynamometry has good to excellent reliability and validity for most measures of isometric lower limb strength and power in a healthy population, particularly for proximal muscle groups. To aid implementation we have created freely available software to extract these variables from data stored on the Lafayette device. Future research should examine the reliability and validity of these variables in

  5. Handheld and mobile hyperspectral imaging sensors for wide-area standoff detection of explosives and chemical warfare agents

    Science.gov (United States)

    Gomer, Nathaniel R.; Gardner, Charles W.; Nelson, Matthew P.

    2016-05-01

    Hyperspectral imaging (HSI) is a valuable tool for the investigation and analysis of targets in complex background with a high degree of autonomy. HSI is beneficial for the detection of threat materials on environmental surfaces, where the concentration of the target of interest is often very low and is typically found within complex scenery. Two HSI techniques that have proven to be valuable are Raman and shortwave infrared (SWIR) HSI. Unfortunately, current generation HSI systems have numerous size, weight, and power (SWaP) limitations that make their potential integration onto a handheld or field portable platform difficult. The systems that are field-portable do so by sacrificing system performance, typically by providing an inefficient area search rate, requiring close proximity to the target for screening, and/or eliminating the potential to conduct real-time measurements. To address these shortcomings, ChemImage Sensor Systems (CISS) is developing a variety of wide-field hyperspectral imaging systems. Raman HSI sensors are being developed to overcome two obstacles present in standard Raman detection systems: slow area search rate (due to small laser spot sizes) and lack of eye-safety. SWIR HSI sensors have been integrated into mobile, robot based platforms and handheld variants for the detection of explosives and chemical warfare agents (CWAs). In addition, the fusion of these two technologies into a single system has shown the feasibility of using both techniques concurrently to provide higher probability of detection and lower false alarm rates. This paper will provide background on Raman and SWIR HSI, discuss the applications for these techniques, and provide an overview of novel CISS HSI sensors focused on sensor design and detection results.

  6. First demonstration of real-time gamma imaging by using a handheld Compton camera for particle therapy

    Science.gov (United States)

    Taya, T.; Kataoka, J.; Kishimoto, A.; Iwamoto, Y.; Koide, A.; Nishio, T.; Kabuki, S.; Inaniwa, T.

    2016-09-01

    The use of real-time gamma imaging for cancer treatment in particle therapy is expected to improve the accuracy of the treatment beam delivery. In this study, we demonstrated the imaging of gamma rays generated by the nuclear interactions during proton irradiation, using a handheld Compton camera (14 cm×15 cm×16 cm, 2.5 kg) based on scintillation detectors. The angular resolution of this Compton camera is ∼8° at full width at half maximum (FWHM) for a 137Cs source. We measured the energy spectra of the gamma rays using a LaBr3(Ce) scintillator and photomultiplier tube, and using the handheld Compton camera, performed image reconstruction when using a 70 MeV proton beam to irradiate a water, Ca(OH)2, and polymethyl methacrylate (PMMA) phantom. In the energy spectra of all three phantoms, we found an obvious peak at 511 keV, which was derived from annihilation gamma rays, and in the energy spectrum of the PMMA phantom, we found another peak at 718 keV, which contains some of the prompt gamma rays produced from 10B. Therefore, we evaluated the peak positions of the projection from the reconstructed images of the PMMA phantom. The differences between the peak positions and the Bragg peak position calculated using simulation are 7 mm±2 mm and 3 mm±8 mm, respectively. Although we could quickly acquire online gamma imaging of both of the energy ranges during proton irradiation, we cannot arrive at a clear conclusion that prompt gamma rays sufficiently trace the Bragg peak from these results because of the uncertainty given by the spatial resolution of the Compton camera. We will develop a high-resolution Compton camera in the near future for further study.

  7. Cellphone-based hand-held microplate reader for point-of-care ELISA testing (Conference Presentation)

    Science.gov (United States)

    Berg, Brandon; Cortazar, Bingen; Tseng, Derek; Ozkan, Haydar; Feng, Steve; Wei, Qingshan; Chan, Raymond Y.; Burbano, Jordi; Farooqui, Qamar; Lewinski, Michael; Di Carlo, Dino; Garner, Omai B.; Ozcan, Aydogan

    2016-03-01

    Enzyme-linked immunosorbent assay (ELISA) in a microplate format has been a gold standard first-line clinical test for diagnosis of various diseases including infectious diseases. However, this technology requires a relatively large and expensive multi-well scanning spectrophotometer to read and quantify the signal from each well, hindering its implementation in resource-limited-settings. Here, we demonstrate a cost-effective and handheld smartphone-based colorimetric microplate reader for rapid digitization and quantification of immunoserology-related ELISA tests in a conventional 96-well plate format at the point of care (POC). This device consists of a bundle of 96 optical fibers to collect the transmitted light from each well of the microplate and direct all the transmission signals from the wells onto the camera of the mobile-phone. Captured images are then transmitted to a remote server through a custom-designed app, and both quantitative and qualitative diagnostic results are returned back to the user within ~1 minute per 96-well plate by using a machine learning algorithm. We tested this mobile-phone based micro-plate reader in a clinical microbiology lab using FDA-approved mumps IgG, measles IgG, and herpes simplex virus IgG (HSV-1 and HSV-2) ELISA tests on 1138 remnant patient samples (roughly 50% training and 50% testing), and achieved an overall accuracy of ~99% or higher for each ELISA test. This handheld and cost-effective platform could be immediately useful for large-scale vaccination monitoring in low-infrastructure settings, and also for other high-throughput disease screening applications at POC.

  8. Handheld Devices with Wide-Area Wireless Connectivity: Applications in Astronomy Educational Technology and Remote Computational Control

    Science.gov (United States)

    Budiardja, R. D.; Lingerfelt, E. J.; Guidry, M. W.

    2003-05-01

    Wireless technology implemented with handheld devices has attractive features because of the potential to access large amounts of data and the prospect of on-the-fly computational analysis from a device that can be carried in a shirt pocket. We shall describe applications of such technology to the general paradigm of making digital wireless connections from the field to upload information and queries to network servers, executing (potentially complex) programs and controlling data analysis and/or database operations on fast network computers, and returning real-time information from this analysis to the handheld device in the field. As illustration, we shall describe several client/server programs that we have written for applications in teaching introductory astronomy. For example, one program allows static and dynamic properties of astronomical objects to be accessed in a remote observation laboratory setting using a digital cell phone or PDA. Another implements interactive quizzing over a cell phone or PDA using a 700-question introductory astronomy quiz database, thus permitting students to study for astronomy quizzes in any environment in which they have a few free minutes and a digital cell phone or wireless PDA. Another allows one to control and monitor a computation done on a Beowulf cluster by changing the parameters of the computation remotely and retrieving the result when the computation is done. The presentation will include hands-on demonstrations with real devices. *Managed by UT-Battelle, LLC, for the U.S. Department of Energy under contract DE-AC05-00OR22725.

  9. Hip- and knee-strength assessments using a hand-held dynamometer with external belt-fixation are inter-tester reliable

    DEFF Research Database (Denmark)

    Thorborg, Kristian; Bandholm, Thomas; Hölmich, Per

    2013-01-01

    PURPOSE: In football, ice-hockey, and track and field, injuries have been predicted, and hip- and knee-strength deficits quantified using hand-held dynamometry (HHD). However, systematic bias exists when testers of different sex and strength perform the measurements. Belt-fixation of the dynamome......PURPOSE: In football, ice-hockey, and track and field, injuries have been predicted, and hip- and knee-strength deficits quantified using hand-held dynamometry (HHD). However, systematic bias exists when testers of different sex and strength perform the measurements. Belt...... women), 30 (8.6) (mean (SD)) years of age, were included. Two physiotherapy students (1 female and 1 male) performed all the measurements after careful instruction and procedure training. Isometric hip abduction, adduction, flexion, extension, and knee-flexion strength were tested. The tester...

  10. Hand-held dynamometry in patients with haematological malignancies: Measurement error in the clinical assessment of knee extension strength

    Directory of Open Access Journals (Sweden)

    Uebelhart Daniel

    2009-03-01

    Full Text Available Abstract Background Hand-held dynamometry is a portable and inexpensive method to quantify muscle strength. To determine if muscle strength has changed, an examiner must know what part of the difference between a patient's pre-treatment and post-treatment measurements is attributable to real change, and what part is due to measurement error. This study aimed to determine the relative and absolute reliability of intra and inter-observer strength measurements with a hand-held dynamometer (HHD. Methods Two observers performed maximum voluntary peak torque measurements (MVPT for isometric knee extension in 24 patients with haematological malignancies. For each patient, the measurements were carried out on the same day. The main outcome measures were the intraclass correlation coefficient (ICC ± 95%CI, the standard error of measurement (SEM, the smallest detectable difference (SDD, the relative values as % of the grand mean of the SEM and SDD, and the limits of agreement for the intra- and inter-observer '3 repetition average' and the 'highest value of 3 MVPT' knee extension strength measures. Results The intra-observer ICCs were 0.94 for the average of 3 MVPT (95%CI: 0.86–0.97 and 0.86 for the highest value of 3 MVPT (95%CI: 0.71–0.94. The ICCs for the inter-observer measurements were 0.89 for the average of 3 MVPT (95%CI: 0.75–0.95 and 0.77 for the highest value of 3 MVPT (95%CI: 0.54–0.90. The SEMs for the intra-observer measurements were 6.22 Nm (3.98% of the grand mean (GM and 9.83 Nm (5.88% of GM. For the inter-observer measurements, the SEMs were 9.65 Nm (6.65% of GM and 11.41 Nm (6.73% of GM. The SDDs for the generated parameters varied from 17.23 Nm (11.04% of GM to 27.26 Nm (17.09% of GM for intra-observer measurements, and 26.76 Nm (16.77% of GM to 31.62 Nm (18.66% of GM for inter-observer measurements, with similar results for the limits of agreement. Conclusion The results indicate that there is acceptable relative reliability

  11. Technical note: Validation of a handheld meter for measuring β-hydroxybutyrate concentrations in plasma and serum from dairy cows.

    Science.gov (United States)

    Pineda, A; Cardoso, F C

    2015-12-01

    The use of handheld meters for cow-side tests for β-hydroxybutyrate (BHB) concentrations in whole blood has become common. The aim of this study was to compare serum BHB (sBHB) and plasma BHB (pBHB) concentrations analyzed using either a "gold standard" enzymatic laboratory method (LM; Randox Laboratories Ltd., Antrim, UK; cat. no. RB1007) or a handheld meter (PX; Precision Xtra, Abbott Diabetes Care Inc., Alameda, CA). Results from 374 (187 serum and 187 plasma) samples taken from Holstein cows from 11 d before (52 samples) to 5 d after parturition (137 samples) were used for the analysis. Statistical analysis was performed using the MIXED, REG, and LOGISTIC procedures of SAS (v9.4; SAS Institute Inc., Cary, NC). A linear mixed model with repeated measures was fitted for LM and PX. Regression and correlation analyses were completed to estimate the relationship and agreement between the 2 methods. Lin's concordance correlation coefficient (CCC) and Bland-Altman plots were used to evaluate agreement between LM and PX. Cross-validation by randomly splitting the data in model-building and validation sets was performed to estimate and validate the equation that predicted the LM results using PX. Receiver operating characteristic (ROC) curves were used to estimate the sensitivity (Se) and specificity (Sp) of PX at different threshold levels. The CCC was 0.74 for pBHB and 0.68 for sBHB. The 95% confidence interval of agreement of the Bland-Altman plot encompassed 96% of the difference between LM and PX for pBHB and 95% for sBHB. The mean difference for pBHB was -0.50±0.25mmol, and that for sBHB was -0.63±0.41mmol. The highest Se and Sp for PX were achieved when the threshold for ketosis was set to 1.8mmol/L for pBHB and 2.1mmol/L for sBHB. The area under the ROC curve was 0.97 for pBHB and 0.96 for sBHB. The negative bias shown by the Bland-Altman plots suggested that PX yielded higher pBHB and sBHB concentrations than the LM. However, the excellent test

  12. Justification and good practice in using handheld portable dental X-ray equipment: a position paper prepared by the European Academy of DentoMaxilloFacial Radiology (EADMFR)

    OpenAIRE

    Berkhout, W E R; Suomalainen, A; Brüllmann, D; Jacobs, Reinhilde; Horner, K.; Stamatakis, H C

    2015-01-01

    Handheld portable X-ray devices are increasingly used for intraoral radiography. This development introduces new challenges to staff and patient safety, for which new or revised risk assessments must be made and acted upon prior to use. Major issues might be: difficulties in using rectangular collimation with beam aiming devices, more complex matching of exposure settings to the X-ray receptor used (e.g. longer exposure times), movements owing to the units' weight, protection of the operator ...

  13. Improving the accuracy of hand-held X-ray fluorescence spectrometers as a tool for monitoring brominated flame retardants in waste polymers.

    Science.gov (United States)

    Guzzonato, A; Puype, F; Harrad, S J

    2016-09-01

    An optimised method for Br quantification as a metric of brominated flame retardant (BFR) concentrations present in Waste Electrical and Electronic Equipment (WEEE) polymers is proposed as an alternative to the sophisticated, yet time consuming GC-MS methods currently preferred. A hand-held X-ray fluorescence (XRF) spectrometer was validated with Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICP-MS). Customized standard materials of specific BFRs in a styrenic polymer were used to perform an external calibration for hand-held XRF ranging from 0.08 to 12 wt% of Br, and cross-checking with LA-ICP-MS having similar LODs (0.0004 wt% for LA-ICP-MS and 0.0011 wt% for XRF). The "thickness calibration" developed here for hand-held XRF and the resulting correction, was applied to 28 real samples and showed excellent (R(2) = 0.9926) accordance with measurements obtained via LA-ICP-MS. This confirms the validity of hand-held XRF as an accurate technique for the determination of Br in WEEE plastics. This is the first use of solid standards to develop a thickness-corrected quantitative XRF measurement of Br in polymers using LA-ICP-MS for method evaluation. Thermal desorption gas chromatography mass spectrometry (TD-GC-MS) was used to confirm the presence of specific BFRs in WEEE polymer samples. We propose that expressing limit values for BFRs in waste materials in terms of Br rather than BFR concentration (based on a conservative assumption about the BFR present), presents a practical solution to the need for an accurate, yet rapid and inexpensive technique capable of monitoring compliance with limit values in situ. PMID:27281541

  14. Elemental Analysis of Bone, Teeth, Horn and Antler in Different Animal Species Using Non-Invasive Handheld X-Ray Fluorescence

    OpenAIRE

    Kittisak Buddhachat; Sarisa Klinhom; Puntita Siengdee; Brown, Janine L.; Raksiri Nomsiri; Patcharaporn Kaewmong; Chatchote Thitaram; Pasuk Mahakkanukrauh; Korakot Nganvongpanit

    2016-01-01

    Mineralized tissues accumulate elements that play crucial roles in animal health. Although elemental content of bone, blood and teeth of human and some animal species have been characterized, data for many others are lacking, as well as species comparisons. Here we describe the distribution of elements in horn (Bovidae), antler (Cervidae), teeth and bone (humerus) across a number of species determined by handheld X-ray fluorescence (XRF) to better understand differences and potential biologic...

  15. Design of Wireless Handheld Magnetic Card Terminal%无线手持磁条卡信息终端设计

    Institute of Scientific and Technical Information of China (English)

    林耀荣; 李想

    2011-01-01

    A wireless handheld magnetic card terminal is designed, which is based on the lightweight TCP/IP protocol stack LwIP. The wireless handheld magnetic card terminal is composed of ARM MCU, GPRS MODEM MC39i, magnetic card interface, keyboard and LCD module. The users' ID information on a magnetic card is read with the wireless handheld magnetic card terminal, and sent to the central server through GPRS network. The wireless handheld magnetic card terminal has the characteristics of low cost, small volume and low power consumption. It can be used in a variety of applications, such as bonus points enquiry terminal system and hospital information enquiry system.%基于小型TCP/IP协议栈LwIP开发了一个无线手持磁条卡信息终端.无线手持磁条卡信息终端由ARM单片机,GPRS无线MODEM MC39i,磁条卡接口芯片,键盘和LCD模块等组成.无线手持磁条卡信息终端利用磁条卡接口读取磁卡上的用户ID信息,并通过GPRS无线网络与中心服务器互联,进行后台处理.开发的无线手持磁条卡信息终端具有成本低、体积小、功耗低等特点,可以用于会员消费积分查询、医疗就诊查询等应用系统中.

  16. Improving car passengers' comfort and experience by supporting the use of handheld devices

    NARCIS (Netherlands)

    Van Veen, S.A.T.; Van Mastrigt, S.; Kamp, I.; Vink, P.

    2014-01-01

    BACKGROUND: There is a demand for interiors to support other activities in a car than controlling the vehicle. Currently, this is the case for the car passengers and – in the future – autonomous driving cars will also facilitate drivers to perform other activities. One of these activities is working

  17. Improving car passengers' comfort and experience by supporting the use of handheld devices

    NARCIS (Netherlands)

    Veen, S.A.T. van; Hiemstra-van Mastrigt, S.; Kamp, I.; Vink, P.

    2014-01-01

    Background: There is a demand for interiors to support other activities in a car than controlling the vehicle. Currently, this is the case for the car passengers and-in the future-autonomous driving cars will also facilitate drivers to perform other activities. One of these activities is working wit

  18. Test-retest reliabilities of hand-held dynamometer for lower-limb muscle strength in intellectual disabilities.

    Science.gov (United States)

    Wuang, Yee-Pay; Chang, Jyh-Jong; Wang, Min-Hung; Lin, Hsiu-Ching

    2013-08-01

    The primary purpose of this study was to investigate the test-retest reliabilities of hand-held dynamometer (HDD) for measuring lower-limb muscle strength in intellectual disabilities (ID). The other purposes were to: (1) compare the lower-limb muscle strength between children with and without ID; (2) probe the relationship between the muscle forces and agility performance in ID; and (3) explore the factors associated with muscle strength in ID. Sixty-one participants (30 boys and 31 girls; mean age=14.1 ± 3.3 year) were assessed by the HDD using a "make" test. The comparative group consisted of 63 typically developing children (33 boys and 30 girls; mean age=14.9 ± 2.1 year). The ID group demonstrated lower muscle groups than in typically developing group. Except for the ankle plantarflexors (ICC=0.69, SEM=0.72), test-retest analysis showed good intrarater reliability with ICC ranging from 0.81 to 0.96, and intrarater SEM values ranged from 0.40 to 0.57. The HDD has the potential to be a reliable tool for strength measurement in ID. Muscle strength was positively related to agility performance. Regression analysis indicated that height, weight, BMI, and activity level were significant predictors of muscle strength in ID.

  19. Task difficulty and inertial properties of hand-held tools: An assessment of their concurrent effects on precision aiming.

    Science.gov (United States)

    Silva, Paula L; Bootsma, Reinoud J; Figueiredo, Priscilla Rezende Pereira; Avelar, Bruna Silva; de Andrade, André Gustavo Pereira; Fonseca, Sérgio T; Mancini, Marisa Cotta

    2016-08-01

    Aiming hand-held tools at targets in space entails adjustments in the dynamical organization of aiming patterns according to the required precision. We asked whether and how these adjustments are modified by the tool's mass distribution. Twelve participants performed reciprocal aiming movements with a 50-cm long wooden probe. Kinematic patterns of probe movements were used as a window into the behavioral dynamic underlying performance of a reciprocal aiming task. We crossed three levels of task difficulty (IDs 2.8, 4.5 and 6.1) with two types of probe varying in their mass distribution (proximal vs distal loading). Movement duration was affected by task difficulty and probe loading (shorter for larger targets and proximal probe loading). Progressive deviations from a sinusoidal movement pattern were observed as task difficulty increased. Such deviations were more pronounced with proximal probe loading. Results point to a higher degree of non-linearity in aiming dynamics when the probe was loaded proximally, which might reflect employment of additional perceptual-motor processes to control the position of its less stable tip at the vicinity of the targets. More generally, the effects of probe loading on aiming pattern and dynamics suggest that perceptual-motor processes responding to task level constraints are sensitive to, and not independent from, biomechanical, end-effector constraints.

  20. Direct and Sensitive Detection of CWA Simulants by Active Capillary Plasma Ionization Coupled to a Handheld Ion Trap Mass Spectrometer

    Science.gov (United States)

    Wolf, Jan-Christoph; Etter, Raphael; Schaer, Martin; Siegenthaler, Peter; Zenobi, Renato

    2016-07-01

    An active capillary plasma ionization (ACI) source was coupled to a handheld mass spectrometer (Mini 10.5; Aston Labs, West Lafayette, IN, USA) and applied to the direct gas-phase detection and quantification of chemical warfare agent (CWA) related chemicals. Complementing the discontinuous atmospheric pressure interface (DAPI) of the Mini 10.5 mass spectrometer with an additional membrane pump, a quasi-continuous sample introduction through the ACI source was achieved. Nerve agent simulants (three dialkyl alkylphosphonates, a dialkyl phosporamidate, and the pesticide dichlorvos) were detected at low gas-phase concentrations with limits of detection ranging from 1.0 μg/m3 to 6.3 μg/m3. Our results demonstrate a sensitivity enhancement for portable MS-instrumentation by using an ACI source, enabling direct, quantitative measurements of volatile organic compounds. Due to its high sensitivity, selectivity, low power consumption (direct on-site CWA detection as required by military or civil protection.

  1. Development of a low cost, GPS-based upgrade to a standard handheld gamma detector for mapping environmental radioactive contamination

    International Nuclear Information System (INIS)

    A low cost extension to a standard handheld radiation monitor was developed, allowing one to perform outdoor georeferenced gamma measurements. It consists of a commercial wireless Bluetooth[reg] GPS receiver, a commercial RS-232 to Bluetooth[reg] converter combined with a standard Bluetooth[reg] enabled pocket personal computer (PPC). The system is intended for use in difficult to access areas, typically for foot campaigns. As the operator walks, a straightforward homemade visual basic program alternately reads GPS position and gamma dose rate into the PPC, creating a data log. This allows a single operator on foot to map between 50 and 200 ha of environmental radiation per day in very rugged areas, depending on the accessibility of the terrain and the detail required. On a test field with known contamination, a spatial precision of about 5-10 m was obtainable. The device was also used to reveal complex contamination patterns in the flooding zones of a radioactively contaminated small river

  2. Handheld chem/biosensor using extreme conformational changes in designed binding proteins to enhance surface plasmon resonance (SPR)

    Science.gov (United States)

    Lepak, Lori A.; Schnatz, Peter; Bendoym, Igor; Kosciolek, Derek; Koder, Ronald; Crouse, David T.

    2016-05-01

    We present research results centered on development of a highly sensitive handheld chem/biosensor device using a novel class of engineered proteins, designed to undergo extreme conformational changes upon binding their target, which in turn cause extreme changes in refractive index in the protein layer. These proteins are attached to a detector chip with a structured metasurface, to translate the refractive index change into an enhanced shift in surface plasmon resonances (SPR), thereby improving the sensitivity of the overall detector relatively to current commercially available SPR systems. Theoretical calculations have demonstrated the potential of the conformational changes in the engineered proteins to provide the desired change in refractive index. A plasmonic chip with a simple grating metasurface structure was designed to maximize the SPR shift. A prototype chip and a prototype for the overall device housing were fabricated with the inclusion of all other required (commercially available) optical components. The proposed device holds considerable promise as a low-cost, highly sensitive, field-deployable detection system for chemical and biological toxins.

  3. Development of the Biopen: a handheld device for surgical printing of adipose stem cells at a chondral wound site.

    Science.gov (United States)

    O'Connell, Cathal D; Di Bella, Claudia; Thompson, Fletcher; Augustine, Cheryl; Beirne, Stephen; Cornock, Rhys; Richards, Christopher J; Chung, Johnson; Gambhir, Sanjeev; Yue, Zhilian; Bourke, Justin; Zhang, Binbin; Taylor, Adam; Quigley, Anita; Kapsa, Robert; Choong, Peter; Wallace, Gordon G

    2016-03-01

    We present a new approach which aims to translate freeform biofabrication into the surgical field, while staying true to the practical constraints of the operating theatre. Herein we describe the development of a handheld biofabrication tool, dubbed the 'biopen', which enables the deposition of living cells and biomaterials in a manual, direct-write fashion. A gelatin-methacrylamide/hyaluronic acid-methacrylate (GelMa/HAMa) hydrogel was printed and UV crosslinked during the deposition process to generate surgically sculpted 3D structures. Custom titanium nozzles were fabricated to allow printing of multiple ink formulations in a collinear (side-by-side) geometry. Independently applied extrusion pressure for both chambers allows for geometric control of the printed structure and for the creation of compositional gradients. In vitro experiments demonstrated that human adipose stem cells maintain high viability (>97%) one week after biopen printing in GelMa/HAMa hydrogels. The biopen described in this study paves the way for the use of 3D bioprinting during the surgical process. The ability to directly control the deposition of regenerative scaffolds with or without the presence of live cells during the surgical process presents an exciting advance not only in the fields of cartilage and bone regeneration but also in other fields where tissue regeneration and replacement are critical. PMID:27004561

  4. Handheld analyzer with on-chip molecularly-imprinted biosensors for electrical detection of propofol in plasma samples.

    Science.gov (United States)

    Hong, Chien-Chong; Lin, Chih-Chung; Hong, Chian-Lang; Lin, Zi-Xiang; Chung, Meng-Hua; Hsieh, Pei-Wen

    2016-12-15

    This paper proposes a novel handheld analyzer with disposable lab-on-a-chip technology for the electrical detection of the anesthetic propofol in human plasma samples for clinical diagnoses. The developed on-chip biosensors are based on the conduction of molecularly imprinted polymers (MIPs) that employ label-free electrical detection techniques. Propofol in total intravenous anesthesia is widely used with a target-controlled infusion system. At present, the methods employed for detecting blood propofol concentrations in hospitals comprise high-performance liquid chromatography and ion mobility spectrometry. These conventional instruments are bulky, expensive, and difficult to access. In this study, we developed a novel plastic microfluidic biochip with an on-chip anesthetic biosensor that was characterized for the rapid detection of propofol concentrations. The experimental results revealed that the response time of the developed propofol biosensors was 25s. The specific binding of an MIP to a nonimprinted polymer (NIP) reached up to 560%. Moreover, the detection limit of the biosensors was 0.1μg/mL, with a linear detection range of 0.1-30μg/mL. The proposed disposable microfluidic biochip with an on-chip anesthetic biosensor using MIPs exhibited excellent performance in the separation and sensing of propofol molecules in the human plasma samples. Compared with large-scale conventional instruments, the developed microfluidic biochips with on-chip MIP biosensors present the advantages of a compact size, high selectivity, low cost, rapid response, and single-step detection.

  5. An ultra compact laser diode source for integration in a handheld point-of-care photoacoustic scanner

    Science.gov (United States)

    Kohl, A.; Canal, C.; Laugustin, A.; Rabot, O.

    2016-03-01

    Photoacoustics is a novel medical imaging technique with high potential for early detection of different diseases such as skin cancer or rheumatology. It is a hybrid modality with pulsed laser light for excitation of the tissue, and ultrasound as response. One of the hurdles for its introduction into the clinic, or even in clinical pilot studies and larger trials, is the bulkiness and price of existing photoacoustic systems. This presentation describes how recent developments in diode laser technology lead to a compact ultrasound scanner with built-in photoacoustic functionality. This is a key for the introduction of photoacoustic technology in the clinic and future point of care systems. We have developed a diode laser system and driver that deliver pulse energies which up to now were only achievable with Nd:YAG lasers. The efficiency and compactness allows integration in a handheld probe. The paper will highlights the laser technology and its radical integration with a medical ultrasound scanner, leading to a first prototype for clinical pilot studies.

  6. Effects of a new mild shampoo for preventing hair loss in Asian by a simple hand-held phototrichogram technique.

    Science.gov (United States)

    Baek, J H; Lee, S Y; Yoo, M; Park, W-S; Lee, S J; Boo, Y C; Koh, J-S

    2011-12-01

    This study was conducted to evaluate the effects of a commercially available shampoo in Korean subjects with alopecia using a simple hand-held phototrichogram technique. Forty-four subjects with alopecia were enrolled and forty subjects continued for 16 weeks. In the test group, total hair counts increased significantly at weeks 8 and 16, and the number of shedding hair significantly decreased at week 16. Terminal hair counts significantly increased at week 8. In the control group, hair thickness and the number of vellus hairs significantly decreased at week 16. The number of total hairs significantly increased in the test group than in the control group at weeks 8 and 16. The number of shedding hairs significantly decreased in the test group than in the control group at week 16. Visual assessment using clinical digital images showed that the number of total hairs appeared to increase although there was no statistical significance. In this study, it was found that the test shampoo could prevent hair loss.

  7. Four dimensional hybrid ultrasound and optoacoustic imaging via passive element optical excitation in a hand-held probe

    Energy Technology Data Exchange (ETDEWEB)

    Fehm, Thomas Felix; Razansky, Daniel, E-mail: dr@tum.de [Institute for Biological and Medical Imaging (IBMI), Helmholtz Zentrum München, Neuherberg (Germany); Faculty of Medicine, Technische Universität München, Munich (Germany); Deán-Ben, Xosé Luís [Institute for Biological and Medical Imaging (IBMI), Helmholtz Zentrum München, Neuherberg (Germany)

    2014-10-27

    Ultrasonography and optoacoustic imaging share powerful advantages related to the natural aptitude for real-time image rendering with high resolution, the hand-held operation, and lack of ionizing radiation. The two methods also possess very different yet highly complementary advantages of the mechanical and optical contrast in living tissues. Nonetheless, efficient integration of these modalities remains challenging owing to the fundamental differences in the underlying physical contrast, optimal signal acquisition, and image reconstruction approaches. We report on a method for hybrid acquisition and reconstruction of three-dimensional pulse-echo ultrasound and optoacoustic images in real time based on passive ultrasound generation with an optical absorber, thus avoiding the hardware complexity of active ultrasound generation. In this way, complete hybrid datasets are generated with a single laser interrogation pulse, resulting in simultaneous rendering of ultrasound and optoacoustic images at an unprecedented rate of 10 volumetric frames per second. Performance is subsequently showcased in phantom experiments and in-vivo measurements from a healthy human volunteer, confirming general clinical applicability of the method.

  8. Intraoperative handheld probe for 3D imaging of pediatric benign vocal fold lesions using optical coherence tomography (Conference Presentation)

    Science.gov (United States)

    Benboujja, Fouzi; Garcia, Jordan; Beaudette, Kathy; Strupler, Mathias; Hartnick, Christopher J.; Boudoux, Caroline

    2016-02-01

    Excessive and repetitive force applied on vocal fold tissue can induce benign vocal fold lesions. Children affected suffer from chronic hoarseness. In this instance, the vibratory ability of the folds, a complex layered microanatomy, becomes impaired. Histological findings have shown that lesions produce a remodeling of sup-epithelial vocal fold layers. However, our understanding of lesion features and development is still limited. Indeed, conventional imaging techniques do not allow a non-invasive assessment of sub-epithelial integrity of the vocal fold. Furthermore, it remains challenging to differentiate these sub-epithelial lesions (such as bilateral nodules, polyps and cysts) from a clinical perspective, as their outer surfaces are relatively similar. As treatment strategy differs for each lesion type, it is critical to efficiently differentiate sub-epithelial alterations involved in benign lesions. In this study, we developed an optical coherence tomography (OCT) based handheld probe suitable for pediatric laryngological imaging. The probe allows for rapid three-dimensional imaging of vocal fold lesions. The system is adapted to allow for high-resolution intra-operative imaging. We imaged 20 patients undergoing direct laryngoscopy during which we looked at different benign pediatric pathologies such as bilateral nodules, cysts and laryngeal papillomatosis and compared them to healthy tissue. We qualitatively and quantitatively characterized laryngeal pathologies and demonstrated the added advantage of using 3D OCT imaging for lesion discrimination and margin assessment. OCT evaluation of the integrity of the vocal cord could yield to a better pediatric management of laryngeal diseases.

  9. Comparative Variable Temperature Studies of Polyamide II with a Benchtop Fourier Transform and a Miniature Handheld Near-Infrared Spectrometer Using 2D-COS and PCMW-2D Analysis.

    Science.gov (United States)

    Unger, Miriam; Pfeifer, Frank; Siesler, Heinz W

    2016-07-01

    The main objective of this communication is to compare the performance of a miniaturized handheld near-infrared (NIR) spectrometer with a benchtop Fourier transform near-infrared (FT-NIR) spectrometer. Generally, NIR spectroscopy is an extremely powerful analytical tool to study hydrogen-bonding changes of amide functionalities in solid and liquid materials and therefore variable temperature NIR measurements of polyamide II (PAII) have been selected as a case study. The information content of the measurement data has been further enhanced by exploiting the potential of two-dimensional correlation spectroscopy (2D-COS) and the perturbation correlation moving window two-dimensional (PCMW2D) evaluation technique. The data provide valuable insights not only into the changes of the hydrogen-bonding structure and the recrystallization of the hydrocarbon segments of the investigated PAII but also in their sequential order. Furthermore, it has been demonstrated that the 2D-COS and PCMW2D results derived from the spectra measured with the miniaturized NIR instrument are equivalent to the information extracted from the data obtained with the high-performance FT-NIR instrument.

  10. A cloud-based multimodality case file for mobile devices.

    Science.gov (United States)

    Balkman, Jason D; Loehfelm, Thomas W

    2014-01-01

    Recent improvements in Web and mobile technology, along with the widespread use of handheld devices in radiology education, provide unique opportunities for creating scalable, universally accessible, portable image-rich radiology case files. A cloud database and a Web-based application for radiologic images were developed to create a mobile case file with reasonable usability, download performance, and image quality for teaching purposes. A total of 75 radiology cases related to breast, thoracic, gastrointestinal, musculoskeletal, and neuroimaging subspecialties were included in the database. Breast imaging cases are the focus of this article, as they best demonstrate handheld display capabilities across a wide variety of modalities. This case subset also illustrates methods for adapting radiologic content to cloud platforms and mobile devices. Readers will gain practical knowledge about storage and retrieval of cloud-based imaging data, an awareness of techniques used to adapt scrollable and high-resolution imaging content for the Web, and an appreciation for optimizing images for handheld devices. The evaluation of this software demonstrates the feasibility of adapting images from most imaging modalities to mobile devices, even in cases of full-field digital mammograms, where high resolution is required to represent subtle pathologic features. The cloud platform allows cases to be added and modified in real time by using only a standard Web browser with no application-specific software. Challenges remain in developing efficient ways to generate, modify, and upload radiologic and supplementary teaching content to this cloud-based platform. Online supplemental material is available for this article. PMID:24819664

  11. The Fluostick, a real hand-held system for near-infrared fluorescence image-guided surgery

    Science.gov (United States)

    Dorval, Paul; Mangeret, Norman; Guillermet, Stephanie; Righini, Christian Adrien; Barabino, Gabriele; Rizo, Philippe; Poulet, Patrick

    2014-02-01

    Near-infrared fluorescence image-guided surgery, FIGS, has lately shown a huge potential in oncologic and lymphatic related surgeries. In some indications such as liver or heart surgery, fluorescence-reachable anatomic structures are limited by the access to the surgical field. Nevertheless, most of the systems available on the market are too large to image the sides of cavities. Small devices are clearly required to improve workability of fluorescence imaging systems. The current work describes the development of an instrument and the results of its evaluation. In order to image narrow area, we developed a small size device consisting of an optical head connected to a control box. The whole system, optical head, control box and software, receives a CE mark for clinical procedures. Building on existing technologies, we simplified the fluorescence imaging system. It consists of a custom charged-coupled device camera, a high color rendering index visible LED illumination and a Class1 Laser fluorophore excitation. With a curved shape of 25x35x150mm, the optical head was designed as a true hand-held probe. The field of view varies from 5x3.75cm to 2x1.5cm. The device is able to collect and display the signal of 5pmol of IndoCyanine Green (ICG) with a spatial resolution down to 70μm at 25 frames per second. The system has been evaluated in pre-clinical and clinical procedures. The preclinical studies confirmed the ability of the system to visualize tumors in mice models. Clinical evaluations includes lymphedema investigations and surgical resections of tumors in colorectal cancer.

  12. Differentiation of benign and malignant breast lesions: A comparison between automatically generated breast volume scans and handheld ultrasound examinations

    International Nuclear Information System (INIS)

    Objective: To assess the diagnostic value of automated breast volume scanning (ABVS) or conventional handheld ultrasonography (HHUS) for the differentiation of benign and malignant breast lesions. Materials and methods: The study prospectively evaluated 239 lesions in 213 women who were scheduled for open biopsy. The patients underwent ABVS and conventional HHUS. The sensitivity, specificity, accuracy, false positive rate, false negative rate, and positive and negative predictive values for HHUS and ABVS images were calculated using histopathological examination as the gold standard. Additionally, diagnostic accuracy was further evaluated according to the size of the masses. Results: Among the 239 breast lesions studied, pathology revealed 85 (35.6%) malignant lesions and 154 (64.4%) benign lesions. ABVS was similar to HHUS in terms of sensitivity (95.3% vs. 90.6%), specificity (80.5% vs. 82.5%), accuracy (85.8% vs. 85.3%), positive predictive value (73.0% vs. 74.0%), and negative predictive value (93.3% vs. 94.1%). The area under the receiver operating characteristic (ROC) curve, which is used to estimate the accuracy of the methods, demonstrated only minor differences between HHUS and ABVS (0.928 and 0.948, respectively). Conclusions: The diagnostic accuracy of HHUS and ABVS in differentiating benign from malignant breast lesions is almost identical. However, ABVS can offer new diagnostic information. ABVS may help to distinguish between real lesions and inhomogeneous areas, find small lesions, and demonstrate the presence of intraductal lesions. This technique is feasible for clinical applications and is a promising new technique in breast imaging.

  13. Parafoveal retinal cone mosaic imaging in children with ultra-compact switchable SLO/OCT handheld probe (Conference Presentation)

    Science.gov (United States)

    LaRocca, Francesco; Nankivil, Derek; DuBose, Theodore B.; Toth, Cynthia A.; Farsiu, Sina; Izatt, Joseph A.

    2016-03-01

    In vivo photoreceptor imaging has enhanced the way vision scientists and ophthalmologists understand the retinal structure, function, and etiology of numerous retinal pathologies. However, the complexity and large footprint of current systems capable of resolving photoreceptors has limited imaging to patients who are able to sit in an upright position and fixate for several minutes. Unfortunately, this excludes an important fraction of patients including bedridden patients, small children, and infants. Here, we show that our dual-modality, high-resolution handheld probe with a weight of only 94 g is capable of visualizing photoreceptors in supine children. Our device utilizes a microelectromechanical systems (MEMS) scanner and a novel telescope design to achieve over an order of magnitude reduction in size compared to similar systems. The probe has a 7° field of view and a lateral resolution of 8 µm. The optical coherence tomography (OCT) system has an axial resolution of 7 µm and a sensitivity of 101 dB. High definition scanning laser ophthalmoscopy (SLO) and OCT images were acquired from children ranging from 14 months to 12 years of age with and without pathology during examination under anesthesia in the operating room. Parafoveal cone imaging was shown using the SLO arm of this device without adaptive optics using a 3° FOV for the first time in children under 4 years old. This work lays the foundation for pediatric research, which will improve understanding of retinal development, maldevelopment and early onset of diseases at the cellular level during the beginning stages of human growth.

  14. A novel 1050nm handheld OCT imaging system for pediatric retinoblastoma patients: technology development and clinical study (Conference Presentation)

    Science.gov (United States)

    Nadiarnykh, Oleg; Moll, Annette C.; de Boer, Johannes F.

    2016-03-01

    We demonstrate a novel optical coherence tomography system specifically developed and validated for clinical imaging of retinoblastoma tumors in pediatric patients. The existing treatment options for this malignant tumor of the retina aim at reduction of tumor (re)growth risks, and vision preservation. The choice of optimal treatment strongly depends on skilled and detailed clinical assessment. Due to the limitations of the existing real-time diagnostic tools the patients at risk are periodically monitored with retinal imaging to confirm the absence of new tumor seedings. Three-dimensional visualization of tissue layer and microvasculature at improved axial and lateral resolution of interference-based OCT imaging provides sensitivity for detection of vital tumor tissue concurrent with local treatment. Our METC-approved system accommodates for the range of optical parameters of infants' eyes, and uses the 1050nm wavelength to access the deeper choroid layers of retina. The prototype is designed for patients in supine position under general anesthesia, where ergonomic handheld module is connected to fiber-based optical setup via umbilical cord. The system conforms to clinical safety requirements, including fully isolated low-voltage electric circuit. Focusing is performed with a mechanically tunable lens, where resolution is 6 µm axially, and varies with focusing at 10-18µm laterally. We will present optical design, performance limitations, and results of the ongoing clinical study, including the increased OCT diagnostic sensitivity in three dimensions in comparison with the established clinical imaging modalities. We will discuss images of early, active, and treated tumors, as well as follow-up on patients after local and systemic treatments.

  15. Short-term measurement of linear growth in preterm infants: validation of a hand-held knemometer.

    Science.gov (United States)

    Michaelsen, K F; Skov, L; Badsberg, J H; Jørgensen, M

    1991-11-01

    A hand-held electronic knemometer, resembling a pair of callipers, for measuring knee-heel length in preterm infants was developed to improve the accuracy of measuring linear growth velocity in infants. The measuring system is based on a magnetic encoder and has a resolution of 0.01 mm. The knee-heel length is recorded automatically when the pressure applied on the heel reaches a preset value. The result of a measurement sequence is expressed as the average of five sequential readings. The error of one measurement sequence was 0.82 mm, corresponding to a coefficient of variation of 0.8% or 2 d of growth in knee-heel length. It includes the technical error and an error component due to the correlation of the readings within a series. The estimated error on the measurement of the knee-heel growth velocity (expressed as mm/d), measured over a 3-wk period, was 0.04 mm, corresponding to a coefficient of variation of 8%. Longitudinal growth data from 11 healthy preterm infants (birth weight 918-1482 g) are presented. Knee-heel length velocity from birth until day of regained birth weight was similar to the velocity during the following weeks, showing that there was no deceleration of growth immediately after birth. In conclusion, the method is accurate and gentle in measuring linear growth velocity over short periods and can be useful in monitoring the progress of ill infants and in growth studies of preterm and mature infants, in which linear growth is a more relevant short-term outcome than weight gain. PMID:1754302

  16. A Rapid Tactile-Motor Reflex Automatically Guides Reaching toward Handheld Objects.

    Science.gov (United States)

    Pruszynski, J Andrew; Johansson, Roland S; Flanagan, J Randall

    2016-03-21

    The ability to respond quickly and effectively when objects in the world suddenly change position is essential for skilled action, and previous work has documented how unexpected changes in the location of a visually presented target during reaching can elicit rapid reflexive (i.e., automatic) corrections of the hand's trajectory [1-12]. In object manipulation and tool use, the sense of touch can also provide information about changes in the location of reach targets. Consider the many tasks where we reach with one hand to part of an object grasped by the other hand: reaching to a berry while holding a branch, reaching for a cap while grasping a bottle, and reaching toward a dog's collar while holding the dog's leash. In such cases, changes in the position of the reach target, due to wind, slip, or an active agent, can be detected, in principle, through touch. Here, we show that when people reach with their right hand to a target attached to the far end of a rod contacted, at the near end, by their left hand, an unexpected change in target location caused by rod rotation rapidly evokes an effective reach correction. That is, spatial information about a change in target location provided by tactile inputs to one hand elicits a rapid correction of the other hand's trajectory. In addition to uncovering a tactile-motor reflex that can support manipulatory actions, our results demonstrate that automatic reach corrections to moving targets are not unique to visually registered changes in target location. PMID:26898466

  17. The Handheld Library: Developments at the Rector Gabriel Ferraté Library, UPC

    Directory of Open Access Journals (Sweden)

    Beatriz Benítez Juan

    2011-10-01

    Full Text Available The purpose of this paper is to highlight the mobile services developed by the Rector Gabriel Ferraté Library (BRGF of the Universitat Politècnica de Catalunya (UPC-Barcelona Tech in Barcelona, Spain. We hope this paper will be of use to other libraries exploring new technologies for communicating and delivering their services to users at a time when mobile services are an emerging topic in librarianship and information science literature. By setting out the successive steps involved in the as yet unfinished process of building our mobile services portfolio, we aim to offer a detailed picture of the mobile services and features offered by a university library from a case study perspective. The main topics to be discussed include: The BRGF’s mobile website, including the information available, its interactive capabilities and the services it provides to its users. The mobile-friendly version of UP Commons(the UPC Library Service’s institutional repositories. The UPC Library Service’s mobile OPAC. The mobile version of u-win(BRGF’s videogame service. The use of QR codes to deliver information to mobile devices. Text message notifications. Additional topics for discussion include: The library’s organisation and the organisational concepts that underpin and make possible its technological developments (including mobile. BRGF’s concern regarding the reduction of investment in the development of mobile services. The criteria and tools used to guide the library’s decisions regarding the design and orientation of current and future mobile services. How mobile services can help to improve the image of the library as a leading technology site. Selected mobile features that BRGF plans to offer in the near future. Ultimately, this paper aims to delineate the effectiveness and potential of delivering library services by the preferred means of communication of a new generation of students and teachers.

  18. Clinical effectiveness of the Respimat® inhaler device in managing chronic obstructive pulmonary disease: evidence when compared with other handheld inhaler devices

    Directory of Open Access Journals (Sweden)

    et al

    2011-02-01

    Full Text Available Felix SF Ram1, Celso R Carvallho2, John White31School of Health and Social Services, Massey University, Auckland, New Zealand; 2Department of Physical Therapy, School of Medicine, University of São Paulo, Brazil; 3York Hospitals NHS Foundation Trust, York Hospital, York, UKObjectives: Medication for the management of chronic obstructive pulmonary disease (COPD may be delivered by a number of different inhaler devices. This study was undertaken to determine the clinical effectiveness of the Respimat® handheld inhaler device compared with other handheld inhaler devices for the delivery of medication in stable COPD.Methodology: A systematic review of high-quality randomized controlled clinical trials comparing Respimat with other inhaler devices using the same medication was performed. Studies were searched for in the Cochrane Central Register of Controlled Trials as well as other relevant electronic databases. Manufacturers of inhaled COPD medication were also contacted for potential trials.Results: Seven studies of high methodological quality with 3813 participants were included in the review. Three trials used Handihaler® as the comparator inhaler, three used a chlorofluorocarbon metered-dose inhaler (CFC-MDI, and one trial used a hydroflouroalkane (HFA-MDI. When Respimat was compared with Handihaler, the following reported outcomes were not significantly different: trough forced expiratory volume in 1 second (FEV1 (weighted mean difference [WMD] 0.01 L; P = 0.14, trough forced vital capacity (FVC (WMD 0.001 L: P = 0.88, peak FEV1 (WMD 0.01 L: P = 0.08, peak FVC (WMD 0.01 L: P = 0.55, morning peak expiratory flow rate (PEFR (WMD 5.06 L/min: P = 0.08, and evening PEFR (WMD 4.39 L/min: P = 0.15. Furthermore, there were no differences when Respimat was compared with Handihaler for risk of exacerbations (relative risk [RR] 0.94: P = 0.81, dry mouth (RR 1.57: P = 0.34, or nasopharyngitis (RR 1.42: P = 0.22. For Respimat compared with CFC-MDI, the

  19. Inactivation of a 25.5 µm Enterococcus faecalis biofilm by a room-temperature, battery-operated, handheld air plasma jet

    Science.gov (United States)

    Pei, X.; Lu, X.; Liu, J.; Liu, D.; Yang, Y.; Ostrikov, K.; Chu, Paul K.; Pan, Y.

    2012-04-01

    Effective biofilm inactivation using a handheld, mobile plasma jet powered by a 12 V dc battery and operated in open air without any external gas supply is reported. This cold, room-temperature plasma is produced in self-repetitive nanosecond discharges with current pulses of ˜100 ns duration, current peak amplitude of ˜6 mA and repetition rate of ˜20 kHz. It is shown that the reactive plasma species penetrate to the bottom layer of a 25.5 µm-thick Enterococcus faecalis biofilm and produce a strong bactericidal effect. This is the thickest reported biofilm inactivated using room-temperature air plasmas.

  20. Inter-tester Reliability of the Hand-held dynamometer and the Leg Extensor Power Rig applied on Patients after Total Hip Arthroplasty

    DEFF Research Database (Denmark)

    Mikkelsen, Lone Ramer; Mechlenburg, Inger; Petersen, Annemette Krintel;

    INTRODUCTION: Rehabilitation has an increasing focus on intensive resistance training early after joint replacement (1,2). This increases the requests for measuring changes in the muscle strength and muscle power over time. Hand-held dynamometer (HHD) is a device used to measure isometric muscle...... strength and Leg Extensor Power Rig (LEPR) is a tool for measuring muscle power. OBJECTIVES: To test the inter-tester reliability of the HHD in hip abduction and the LEPR in Total Hip Arthroplasty (THA) patients. METHODS: Two groups each consisting 20 subjects were included. Mean age was 68.4 years. All...

  1. Inter-tester Reliability of the Hand-held dynamometer and the Leg Extensor Power Rig applied on Patients after Total Hip Arthroplasty

    DEFF Research Database (Denmark)

    Mikkelsen, Lone Ramer; Petersen, Annemette Krintel; Mikkelsen, Søren Søndergaard;

    Background: Rehabilitation has an increasing focus on intensive resistance training early after joint replacement. This increases the requests for measuring changes in the muscle strength and muscle power over time. Hand-held dynamometer (HHD) is a device used to measure isometric muscle strength...... and Leg Extensor Power Rig (LEPR) is a tool for measuring muscle power. Purpose / Aim of Study: To test the inter-tester reliability of the HHD and the LEPR in Total Hip Arthroplasty (THA) patients. Materials and Methods: Two groups each consisting 20 subjects were included. Mean age was 68.4 years. All...

  2. Repurposed automated handheld counter as a point-of-care tool to identify individuals 'at risk' of serious post-ivermectin encephalopathy.

    OpenAIRE

    Sasisekhar Bennuru; Sébastien D S Pion; Joseph Kamgno; Samuel Wanji; Thomas B Nutman

    2014-01-01

    Administration of ivermectin (IVM) as part of mass drug administration (MDA) campaigns for onchocerciasis and/or lymphatic filariasis (LF) has been suspended in areas co-endemic for Loa loa due to severe post-treatment adverse events (SAEs) associated with high-burden of infection (>30,000 mf/ml). One simple approach for preventing SAEs is to identify and exclude individuals at risk from MDA. Here, we describe a repurposed hand-held automated cell counter (Scepter 2.0; HHAC) as a rapid, point...

  3. Repurposed Automated Handheld Counter as a Point-of-Care Tool to Identify Individuals ‘At Risk’ of Serious Post-Ivermectin Encephalopathy

    OpenAIRE

    Bennuru, Sasisekhar; Sébastien D S Pion; Kamgno, Joseph; Wanji, Samuel; Thomas B Nutman

    2014-01-01

    Introduction: Administration of ivermectin (IVM) as part of mass drug administration (MDA) campaigns for onchocerciasis and/or lymphatic filariasis (LF) has been suspended in areas co-endemic for Loa loa due to severe post-treatment adverse events (SAEs) associated with high-burden of infection (>30,000 mf/ml). One simple approach for preventing SAEs is to identify and exclude individuals at risk from MDA. Here, we describe a repurposed hand-held automated cell counter (Scepter 2.0; HHAC) as ...

  4. 基于PXA322的RFID手持终端的设计%Design of RFID Handheld Terminals Based on PXA322

    Institute of Scientific and Technical Information of China (English)

    李颀; 胡海强

    2012-01-01

    In view of the low-efficiency situation of the modern inventory management relying on hand-held devices currently, this paper proposed the design of handheld terminals based on the RFID technology and the advanced ARM processor. Using Mifare non-contact reader chip MFRC522 produced by NXP, a Netherlands enterprise, as the core chip, we designed the RFID data acquisition module. Then in order to improve the system for timely and accurate data processing and with regard to standby time, we adopted the PXA322 processor and programmable power management chip as the primary processor in the core components. Through the analysis of PXA322 processor and RFID application in inventory management, we designed and realized the handheld reader system hardware architecture and RFID-driven program design. The result of an experimental study demonstrated that the design could improve the hand-held device's data reading speed and ability to process data.%针对目前手持设备记录货物进出数据在现代库存管理上效率低下的情况,设计一款基于RFID技术和高性能ARM处理器的手持终端.采用荷兰恩智浦公司的Mifare非接触读卡芯片MFRC522为核心芯片,设计RFID数据采集模块.为提高系统对数据及时准确的处理和延长待机时间,采用PXA322作为系统的核心处理器,同时选用可编程电源管理芯片LP3972.在分析研究RFID在库存管理应用的基础上,完成手持读写器系统硬件设计并实现RFID驱动程序的设计.实验结果表明:该设计提高了手持设备数据读取速度和对数据的处理能力.

  5. Possible Radiation-Induced Damage to the Molecular Structure of Wooden Artifacts Due to Micro-Computed Tomography, Handheld X-Ray Fluorescence, and X-Ray Photoelectron Spectroscopic Techniques

    Directory of Open Access Journals (Sweden)

    Madalena Kozachuk

    2016-05-01

    Full Text Available This study was undertaken to ascertain whether radiation produced by X-ray photoelectron spectroscopy (XPS, micro-computed tomography (μCT and/or portable handheld X-ray fluorescence (XRF equipment might damage wood artifacts during analysis. Changes at the molecular level were monitored by Fourier transform infrared (FTIR analysis. No significant changes in FTIR spectra were observed as a result of μCT or handheld XRF analysis. No substantial changes in the collected FTIR spectra were observed when XPS analytical times on the order of minutes were used. However, XPS analysis collected over tens of hours did produce significant changes in the FTIR spectra.

  6. Into the Wild: Neuroergonomic Differentiation of Hand-Held and Augmented Reality Wearable Displays during Outdoor Navigation with Functional Near Infrared Spectroscopy

    Science.gov (United States)

    McKendrick, Ryan; Parasuraman, Raja; Murtza, Rabia; Formwalt, Alice; Baccus, Wendy; Paczynski, Martin; Ayaz, Hasan

    2016-01-01

    Highly mobile computing devices promise to improve quality of life, productivity, and performance. Increased situation awareness and reduced mental workload are two potential means by which this can be accomplished. However, it is difficult to measure these concepts in the “wild”. We employed ultra-portable battery operated and wireless functional near infrared spectroscopy (fNIRS) to non-invasively measure hemodynamic changes in the brain’s Prefrontal cortex (PFC). Measurements were taken during navigation of a college campus with either a hand-held display, or an Augmented reality wearable display (ARWD). Hemodynamic measures were also paired with secondary tasks of visual perception and auditory working memory to provide behavioral assessment of situation awareness and mental workload. Navigating with an augmented reality wearable display produced the least workload during the auditory working memory task, and a trend for improved situation awareness in our measures of prefrontal hemodynamics. The hemodynamics associated with errors were also different between the two devices. Errors with an augmented reality wearable display were associated with increased prefrontal activity and the opposite was observed for the hand-held display. This suggests that the cognitive mechanisms underlying errors between the two devices differ. These findings show fNIRS is a valuable tool for assessing new technology in ecologically valid settings and that ARWDs offer benefits with regards to mental workload while navigating, and potentially superior situation awareness with improved display design. PMID:27242480

  7. Use of handheld X-ray fluorescence as a non-invasive method to distinguish between Asian and African elephant tusks.

    Science.gov (United States)

    Buddhachat, Kittisak; Thitaram, Chatchote; Brown, Janine L; Klinhom, Sarisa; Bansiddhi, Pakkanut; Penchart, Kitichaya; Ouitavon, Kanita; Sriaksorn, Khanittha; Pa-in, Chalermpol; Kanchanasaka, Budsabong; Somgird, Chaleamchat; Nganvongpanit, Korakot

    2016-01-01

    We describe the use of handheld X-ray fluorescence, for elephant tusk species identification. Asian (n = 72) and African (n = 85) elephant tusks were scanned and we utilized the species differences in elemental composition to develop a functional model differentiating between species with high precision. Spatially, the majority of measured elements (n = 26) exhibited a homogeneous distribution in cross-section, but a more heterologous pattern in the longitudinal direction. Twenty-one of twenty four elements differed between Asian and African samples. Data were subjected to hierarchical cluster analysis followed by a stepwise discriminant analysis, which identified elements for the functional equation. The best equation consisted of ratios of Si, S, Cl, Ti, Mn, Ag, Sb and W, with Zr as the denominator. Next, Bayesian binary regression model analysis was conducted to predict the probability that a tusk would be of African origin. A cut-off value was established to improve discrimination. This Bayesian hybrid classification model was then validated by scanning an additional 30 Asian and 41 African tusks, which showed high accuracy (94%) and precision (95%) rates. We conclude that handheld XRF is an accurate, non-invasive method to discriminate origin of elephant tusks provides rapid results applicable to use in the field. PMID:27097717

  8. Into the Wild: Neuroergonomic Differentiation of Hand-Held and Augmented Reality Wearable Displays during Outdoor Navigation with Functional Near Infrared Spectroscopy.

    Science.gov (United States)

    McKendrick, Ryan; Parasuraman, Raja; Murtza, Rabia; Formwalt, Alice; Baccus, Wendy; Paczynski, Martin; Ayaz, Hasan

    2016-01-01

    Highly mobile computing devices promise to improve quality of life, productivity, and performance. Increased situation awareness and reduced mental workload are two potential means by which this can be accomplished. However, it is difficult to measure these concepts in the "wild". We employed ultra-portable battery operated and wireless functional near infrared spectroscopy (fNIRS) to non-invasively measure hemodynamic changes in the brain's Prefrontal cortex (PFC). Measurements were taken during navigation of a college campus with either a hand-held display, or an Augmented reality wearable display (ARWD). Hemodynamic measures were also paired with secondary tasks of visual perception and auditory working memory to provide behavioral assessment of situation awareness and mental workload. Navigating with an augmented reality wearable display produced the least workload during the auditory working memory task, and a trend for improved situation awareness in our measures of prefrontal hemodynamics. The hemodynamics associated with errors were also different between the two devices. Errors with an augmented reality wearable display were associated with increased prefrontal activity and the opposite was observed for the hand-held display. This suggests that the cognitive mechanisms underlying errors between the two devices differ. These findings show fNIRS is a valuable tool for assessing new technology in ecologically valid settings and that ARWDs offer benefits with regards to mental workload while navigating, and potentially superior situation awareness with improved display design.

  9. Into the Wild: Neuroergonomic Differentiation of Hand-Held and Augmented Reality Wearable Displays during Outdoor Navigation with Functional Near Infrared Spectroscopy.

    Science.gov (United States)

    McKendrick, Ryan; Parasuraman, Raja; Murtza, Rabia; Formwalt, Alice; Baccus, Wendy; Paczynski, Martin; Ayaz, Hasan

    2016-01-01

    Highly mobile computing devices promise to improve quality of life, productivity, and performance. Increased situation awareness and reduced mental workload are two potential means by which this can be accomplished. However, it is difficult to measure these concepts in the "wild". We employed ultra-portable battery operated and wireless functional near infrared spectroscopy (fNIRS) to non-invasively measure hemodynamic changes in the brain's Prefrontal cortex (PFC). Measurements were taken during navigation of a college campus with either a hand-held display, or an Augmented reality wearable display (ARWD). Hemodynamic measures were also paired with secondary tasks of visual perception and auditory working memory to provide behavioral assessment of situation awareness and mental workload. Navigating with an augmented reality wearable display produced the least workload during the auditory working memory task, and a trend for improved situation awareness in our measures of prefrontal hemodynamics. The hemodynamics associated with errors were also different between the two devices. Errors with an augmented reality wearable display were associated with increased prefrontal activity and the opposite was observed for the hand-held display. This suggests that the cognitive mechanisms underlying errors between the two devices differ. These findings show fNIRS is a valuable tool for assessing new technology in ecologically valid settings and that ARWDs offer benefits with regards to mental workload while navigating, and potentially superior situation awareness with improved display design. PMID:27242480

  10. Use of handheld X-ray fluorescence as a non-invasive method to distinguish between Asian and African elephant tusks

    Science.gov (United States)

    Buddhachat, Kittisak; Thitaram, Chatchote; Brown, Janine L.; Klinhom, Sarisa; Bansiddhi, Pakkanut; Penchart, Kitichaya; Ouitavon, Kanita; Sriaksorn, Khanittha; Pa-in, Chalermpol; Kanchanasaka, Budsabong; Somgird, Chaleamchat; Nganvongpanit, Korakot

    2016-01-01

    We describe the use of handheld X-ray fluorescence, for elephant tusk species identification. Asian (n = 72) and African (n = 85) elephant tusks were scanned and we utilized the species differences in elemental composition to develop a functional model differentiating between species with high precision. Spatially, the majority of measured elements (n = 26) exhibited a homogeneous distribution in cross-section, but a more heterologous pattern in the longitudinal direction. Twenty-one of twenty four elements differed between Asian and African samples. Data were subjected to hierarchical cluster analysis followed by a stepwise discriminant analysis, which identified elements for the functional equation. The best equation consisted of ratios of Si, S, Cl, Ti, Mn, Ag, Sb and W, with Zr as the denominator. Next, Bayesian binary regression model analysis was conducted to predict the probability that a tusk would be of African origin. A cut-off value was established to improve discrimination. This Bayesian hybrid classification model was then validated by scanning an additional 30 Asian and 41 African tusks, which showed high accuracy (94%) and precision (95%) rates. We conclude that handheld XRF is an accurate, non-invasive method to discriminate origin of elephant tusks provides rapid results applicable to use in the field. PMID:27097717

  11. Handheld solar light use, durability, and retention among women and girls in internally displaced persons camps in Haiti — 2013–2014

    Science.gov (United States)

    Dynes, Michelle; Rosenthal, Mariana; Hulland, Erin; Hardy, Colleen; Torre, Lisandro; Tomczyk, Barbara

    2016-01-01

    During conflict and disasters, women and girls are at increased risk of gender based violence. International humanitarian guidelines call for the distribution of individual lighting to meet women and girls’ basic needs and to reduce risk of violence; however, little evidence exists to support these guidelines. This paper presents an evaluation of handheld solar light use, retention, and durability among women and girls living in two internally displaced persons camps in Port-au-Prince, Haiti. Data was gathered prospectively via five household surveys from August 2013 to April 2014; a total of 754 females participated in the study. Women reported going outside at night more frequently at the end of the study than at the beginning. The handheld solar lights were the most common source of lighting at endline, whereas candle and gas lamp use declined significantly over time. Results from a Life-Table survival analysis estimated that households had an 83% probability of still owning a functioning light after seven months. Given the frequent use, acceptable durability, and retention of the lights, donors and humanitarian organizations should consider supporting light distribution to women and girls in internally displaced persons camps to help meet their basic needs. PMID:27482509

  12. Motion-compensated hand-held common-path Fourier-domain optical coherence tomography probe for image-guided intervention

    Science.gov (United States)

    Huang, Yong; Song, Cheol; Liu, Xuan; Kang, Jin U.

    2013-03-01

    A motion-compensated hand-held common-path Fourier-domain optical coherence tomography imaging probe has been developed for image guided intervention during microsurgery. A hand-held prototype instrument was designed and fabricated by integrating an imaging fiber probe inside a stainless steel needle which is attached to the ceramic shaft of a piezoelectric motor housed in an aluminum handle. The fiber probe obtains A-scan images. The distance information was extracted from the A-scans to track the sample surface distance and a fixed distance was maintained by a feedback motor control which effectively compensated hand tremor and target movements in the axial direction. Graphical user interface, real-time data processing, and visualization based on a CPU-GPU hybrid programming architecture were developed and used in the implantation of this system. To validate the system, free-hand optical coherence tomography images using various samples were obtained. The system can be easily integrated into microsurgical tools and robotics for a wide range of clinical applications. Such tools could offer physicians the freedom to easily image sites of interest with reduced risk and higher image quality.

  13. Design of handheld terminal CoreProcess system based on Android%基于Android的手持终端CoreProcess系统的设计

    Institute of Scientific and Technical Information of China (English)

    韩冰; 闫红岩

    2012-01-01

    为了在手持终端系统上实现音/视频的转发、播放、录制等功能,设计了手持终端CoreProcess系统.该系统分为嵌入式客户端和Windows服务器端2部分,采用三星公司以S5PC110为核心芯片的Android系统,使用了V4L2视频驱动、ALSA音频驱动等技术.交付前期的测试验证表明,系统能够稳定工作,在网络传输过程中出现的丢包、码流控制方案不稳等问题也都得到了解决.%To realize the functions of sound/video transmission,playing,recording etc. on the handheld terminal system,the handheld CoreProcess terminal system was designed,which is divided into two parts; embedded client and Windows server. Besides V4L2 video driver,ALSA audio driver,it adopts Android system with the Samsung S5PC110 as the core chip. The test results showed that it can work stably,the problems of losing package, the instability of controlling code stream project and so on are solved in the process of net transmission.

  14. Quantification of prostate deformation due to needle insertion during TRUS-guided biopsy: comparison of hand-held and mechanically stabilized systems

    Science.gov (United States)

    De Silva, Tharindu; Bax, Jeffrey; Fenster, Aaron; Samarabandu, Jagath; Ward, Aaron D.

    2011-03-01

    Prostate biopsy is the clinical standard for the definitive diagnosis of prostate cancer. To overcome the limitations of 2D TRUS-guided biopsy systems when targeting pre-planned locations, systems have been developed with 3D guidance to improve the accuracy of cancer detection. Prostate deformation due to needle insertion and biopsy gun firing is a potential source of error that can cause target misalignments during biopsies. We use non-rigid registration of 2D TRUS images to quantify the deformation during the needle insertion and the biopsy gun firing procedure, and compare this effect in biopsies performed using a handheld TRUS probe with those performed using a mechanically assisted 3D TRUS guided biopsy system. Although the mechanically assisted biopsy system had a mean deformation approximately 0.2 mm greater than that of the handheld approach, it yielded a lower relative increase of deformation near the needle axis during the needle insertion stage and greater deformational stability of the prostate during the biopsy gun firing stage. We also analyzed the axial and lateral components of the tissue motion; our results indicated that the motion is weakly biased in the direction orthogonal to the needle, which is less than ideal from a targeting standpoint given the long, narrow cylindrical shape of the biopsy core.

  15. Accuracy of Mobile Phone and Handheld Light Microscopy for the Diagnosis of Schistosomiasis and Intestinal Protozoa Infections in Cote d'Ivoire.

    Directory of Open Access Journals (Sweden)

    Jean T Coulibaly

    2016-06-01

    Full Text Available Handheld light microscopy using compact optics and mobile phones may improve the quality of health care in resource-constrained settings by enabling access to prompt and accurate diagnosis.Laboratory technicians were trained to operate two handheld diagnostic devices (Newton Nm1 microscope and a clip-on version of the mobile phone-based CellScope. The accuracy of these devices was compared to conventional light microscopy for the diagnosis of Schistosoma haematobium, S. mansoni, and intestinal protozoa infection in a community-based survey in rural Côte d'Ivoire. One slide of 10 ml filtered urine and a single Kato-Katz thick smear from 226 individuals were subjected to the Newton Nm1 microscope and CellScope for detection of Schistosoma eggs and compared to conventional microscopy. Additionally, 121 sodium acetate-acetic acid-formalin (SAF-fixed stool samples were examined by the Newton Nm1 microscope and compared to conventional microscopy for the diagnosis of intestinal protozoa.The prevalence of S. haematobium, S. mansoni, Giardia intestinalis, and Entamoeba histolytica/E. dispar, as determined by conventional microscopy, was 39.8%, 5.3%, 20.7%, and 4.9%, respectively. The Newton Nm1 microscope had diagnostic sensitivities for S. mansoni and S. haematobium infection of 91.7% (95% confidence interval (CI 59.8-99.6% and 81.1% (95% CI 71.2-88.3%, respectively, and specificities of 99.5% (95% CI 97.0-100% and 97.1% (95% CI 92.2-99.1%, respectively. The CellScope demonstrated sensitivities for S. mansoni and S. haematobium of 50.0% (95% CI 25.4-74.6% and 35.6% (95% CI 25.9-46.4%, respectively, and specificities of 99.5% (95% CI 97.0-100% and 100% (95% CI 86.7-100%, respectively. For G. intestinalis and E. histolytica/E. dispar, the Newton Nm1 microscope had sensitivity of 84.0% (95% CI 63.1-94.7% and 83.3% (95% CI 36.5-99.1%, respectively, and 100% specificity.Handheld diagnostic devices can be employed in community-based surveys in resource

  16. Accuracy of Mobile Phone and Handheld Light Microscopy for the Diagnosis of Schistosomiasis and Intestinal Protozoa Infections in Côte d’Ivoire

    Science.gov (United States)

    Coulibaly, Jean T.; Ouattara, Mamadou; D’Ambrosio, Michael V.; Fletcher, Daniel A.; Keiser, Jennifer; Utzinger, Jürg; N’Goran, Eliézer K.

    2016-01-01

    Background Handheld light microscopy using compact optics and mobile phones may improve the quality of health care in resource-constrained settings by enabling access to prompt and accurate diagnosis. Methodology Laboratory technicians were trained to operate two handheld diagnostic devices (Newton Nm1 microscope and a clip-on version of the mobile phone-based CellScope). The accuracy of these devices was compared to conventional light microscopy for the diagnosis of Schistosoma haematobium, S. mansoni, and intestinal protozoa infection in a community-based survey in rural Côte d’Ivoire. One slide of 10 ml filtered urine and a single Kato-Katz thick smear from 226 individuals were subjected to the Newton Nm1 microscope and CellScope for detection of Schistosoma eggs and compared to conventional microscopy. Additionally, 121 sodium acetate-acetic acid-formalin (SAF)-fixed stool samples were examined by the Newton Nm1 microscope and compared to conventional microscopy for the diagnosis of intestinal protozoa. Principal Findings The prevalence of S. haematobium, S. mansoni, Giardia intestinalis, and Entamoeba histolytica/E. dispar, as determined by conventional microscopy, was 39.8%, 5.3%, 20.7%, and 4.9%, respectively. The Newton Nm1 microscope had diagnostic sensitivities for S. mansoni and S. haematobium infection of 91.7% (95% confidence interval (CI) 59.8–99.6%) and 81.1% (95% CI 71.2–88.3%), respectively, and specificities of 99.5% (95% CI 97.0–100%) and 97.1% (95% CI 92.2–99.1%), respectively. The CellScope demonstrated sensitivities for S. mansoni and S. haematobium of 50.0% (95% CI 25.4–74.6%) and 35.6% (95% CI 25.9–46.4%), respectively, and specificities of 99.5% (95% CI 97.0–100%) and 100% (95% CI 86.7–100%), respectively. For G. intestinalis and E. histolytica/E. dispar, the Newton Nm1 microscope had sensitivity of 84.0% (95% CI 63.1–94.7%) and 83.3% (95% CI 36.5–99.1%), respectively, and 100% specificity. Conclusions

  17. A Platform-Independent Plugin for Navigating Online Radiology Cases.

    Science.gov (United States)

    Balkman, Jason D; Awan, Omer A

    2016-06-01

    Software methods that enable navigation of radiology cases on various digital platforms differ between handheld devices and desktop computers. This has resulted in poor compatibility of online radiology teaching files across mobile smartphones, tablets, and desktop computers. A standardized, platform-independent, or "agnostic" approach for presenting online radiology content was produced in this work by leveraging modern hypertext markup language (HTML) and JavaScript web software technology. We describe the design and evaluation of this software, demonstrate its use across multiple viewing platforms, and make it publicly available as a model for future development efforts. PMID:26530051

  18. A Platform-Independent Plugin for Navigating Online Radiology Cases.

    Science.gov (United States)

    Balkman, Jason D; Awan, Omer A

    2016-06-01

    Software methods that enable navigation of radiology cases on various digital platforms differ between handheld devices and desktop computers. This has resulted in poor compatibility of online radiology teaching files across mobile smartphones, tablets, and desktop computers. A standardized, platform-independent, or "agnostic" approach for presenting online radiology content was produced in this work by leveraging modern hypertext markup language (HTML) and JavaScript web software technology. We describe the design and evaluation of this software, demonstrate its use across multiple viewing platforms, and make it publicly available as a model for future development efforts.

  19. Compact printed two dipole array antenna with a high front-back ratio for ultra-high-frequency radio-frequency identification handheld reader applications

    DEFF Research Database (Denmark)

    Liu, Qi; Zhang, Shuai; He, Sailing

    2015-01-01

    A printed two-dipole array antenna with a high front-back ratio is proposed for ultra-high-frequency (UHF) radio-frequency identification handheld readers. The proposed antenna is a parasitic dual-element array with the ends of both elements folded back towards each other for additional coupling....... The antenna features a compact size of 89 mm × 87 mm and works properly with satisfactory gain and total efficiency in the wide UHF band of 860–960 MHz. Furthermore, the front-to-back ratio of 15–26.8 dB, the peak gain of 3.7–4.4 dBi and the total efficiency of more than 80% in the Federal...

  20. 基于Android的定位追踪APP的设计与实现%The Design of Simple Hand-held Tracking APP Based on Android

    Institute of Scientific and Technical Information of China (English)

    葛欣; 蔺雪葳; 王依岳

    2016-01-01

    针对手持定位追踪器便携及操作方面的缺陷,本文设计了基于Android的追踪器手机客户端APP。从定位系统的完整性出发,介绍了追踪系统的工作原理、服务器端数据处理机制、手机APP工作流程,以及调用百度地图显示定位器位置的原理和流程。%Defect Tracker for portable hand-held and operated, this article is designed based on Android tracking client APP, from the integrity of the positioning system, the working principle of the tracking system, server-side data processing mechanism, the mobile phone APP workflow and call Baidu map shows the location of the vehicle the principles and processes.

  1. Elemental Analysis of Bone, Teeth, Horn and Antler in Different Animal Species Using Non-Invasive Handheld X-Ray Fluorescence.

    Science.gov (United States)

    Buddhachat, Kittisak; Klinhom, Sarisa; Siengdee, Puntita; Brown, Janine L; Nomsiri, Raksiri; Kaewmong, Patcharaporn; Thitaram, Chatchote; Mahakkanukrauh, Pasuk; Nganvongpanit, Korakot

    2016-01-01

    Mineralized tissues accumulate elements that play crucial roles in animal health. Although elemental content of bone, blood and teeth of human and some animal species have been characterized, data for many others are lacking, as well as species comparisons. Here we describe the distribution of elements in horn (Bovidae), antler (Cervidae), teeth and bone (humerus) across a number of species determined by handheld X-ray fluorescence (XRF) to better understand differences and potential biological relevance. A difference in elemental profiles between horns and antlers was observed, possibly due to the outer layer of horns being comprised of keratin, whereas antlers are true bone. Species differences in tissue elemental content may be intrinsic, but also related to feeding habits that contribute to mineral accumulation, particularly for toxic heavy metals. One significant finding was a higher level of iron (Fe) in the humerus bone of elephants compared to other species. This may be an adaptation of the hematopoietic system by distributing Fe throughout the bone rather than the marrow, as elephant humerus lacks a marrow cavity. We also conducted discriminant analysis and found XRF was capable of distinguishing samples from different species, with humerus bone being the best source for species discrimination. For example, we found a 79.2% correct prediction and success rate of 80% for classification between human and non-human humerus bone. These findings show that handheld XRF can serve as an effective tool for the biological study of elemental composition in mineralized tissue samples and may have a forensic application. PMID:27196603

  2. Elemental Analysis of Bone, Teeth, Horn and Antler in Different Animal Species Using Non-Invasive Handheld X-Ray Fluorescence.

    Directory of Open Access Journals (Sweden)

    Kittisak Buddhachat

    Full Text Available Mineralized tissues accumulate elements that play crucial roles in animal health. Although elemental content of bone, blood and teeth of human and some animal species have been characterized, data for many others are lacking, as well as species comparisons. Here we describe the distribution of elements in horn (Bovidae, antler (Cervidae, teeth and bone (humerus across a number of species determined by handheld X-ray fluorescence (XRF to better understand differences and potential biological relevance. A difference in elemental profiles between horns and antlers was observed, possibly due to the outer layer of horns being comprised of keratin, whereas antlers are true bone. Species differences in tissue elemental content may be intrinsic, but also related to feeding habits that contribute to mineral accumulation, particularly for toxic heavy metals. One significant finding was a higher level of iron (Fe in the humerus bone of elephants compared to other species. This may be an adaptation of the hematopoietic system by distributing Fe throughout the bone rather than the marrow, as elephant humerus lacks a marrow cavity. We also conducted discriminant analysis and found XRF was capable of distinguishing samples from different species, with humerus bone being the best source for species discrimination. For example, we found a 79.2% correct prediction and success rate of 80% for classification between human and non-human humerus bone. These findings show that handheld XRF can serve as an effective tool for the biological study of elemental composition in mineralized tissue samples and may have a forensic application.

  3. Large-area, uniform and low-cost dual-mode plasmonic naked-eye colorimetry and SERS sensor with handheld Raman spectrometer

    Science.gov (United States)

    Xu, Zhida; Jiang, Jing; Wang, Xinhao; Han, Kevin; Ameen, Abid; Khan, Ibrahim; Chang, Te-Wei; Liu, Gang Logan

    2016-03-01

    We demonstrated a highly-sensitive, wafer-scale, highly-uniform plasmonic nano-mushroom substrate based on plastic for naked-eye plasmonic colorimetry and surface-enhanced Raman spectroscopy (SERS). We gave it the name FlexBrite. The dual-mode functionality of FlexBrite allows for label-free qualitative analysis by SERS with an enhancement factor (EF) of 108 and label-free quantitative analysis by naked-eye colorimetry with a sensitivity of 611 nm RIU-1. The SERS EF of FlexBrite in the wet state was found to be 4.81 × 108, 7 times stronger than in the dry state, making FlexBrite suitable for aqueous environments such as microfluid systems. The label-free detection of biotin-streptavidin interaction by both SERS and colorimetry was demonstrated with FlexBrite. The detection of trace amounts of the narcotic drug methamphetamine in drinking water by SERS was implemented with a handheld Raman spectrometer and FlexBrite. This plastic-based dual-mode nano-mushroom substrate has the potential to be used as a sensing platform for easy and fast analysis in chemical and biological assays.We demonstrated a highly-sensitive, wafer-scale, highly-uniform plasmonic nano-mushroom substrate based on plastic for naked-eye plasmonic colorimetry and surface-enhanced Raman spectroscopy (SERS). We gave it the name FlexBrite. The dual-mode functionality of FlexBrite allows for label-free qualitative analysis by SERS with an enhancement factor (EF) of 108 and label-free quantitative analysis by naked-eye colorimetry with a sensitivity of 611 nm RIU-1. The SERS EF of FlexBrite in the wet state was found to be 4.81 × 108, 7 times stronger than in the dry state, making FlexBrite suitable for aqueous environments such as microfluid systems. The label-free detection of biotin-streptavidin interaction by both SERS and colorimetry was demonstrated with FlexBrite. The detection of trace amounts of the narcotic drug methamphetamine in drinking water by SERS was implemented with a handheld Raman

  4. Feasibility, double-blind, randomised, placebo-controlled, multi-centre trial of hand-held NB-UVB phototherapy for the treatment of vitiligo at home (HI-Light trial: Home Intervention of Light therapy)

    OpenAIRE

    Eleftheriadou, Viktoria; Thomas, Kim; Ravenscroft, Jane; Whitton, Maxine; Batchelor, Jonathan; Williams, Hywel

    2014-01-01

    Background Hand-held NB-UVB units are lightweight devices that may overcome the need to treat vitiligo in hospital-based phototherapy cabinets, allowing early treatment at home that may enhance the likelihood of successful repigmentation. The pilot Hi-Light trial examined the feasibility of conducting a large multi-centre randomised controlled trial (RCT) on the use of such devices by exploring recruitment, adherence, acceptability, and patient education. Methods This was a feasibility, doubl...

  5. Validity and reliability of isometric muscle strength measurements of hip abduction and abduction with external hip rotation in a bent-hip position using a handheld dynamometer with a belt.

    Science.gov (United States)

    Aramaki, Hidefumi; Katoh, Munenori; Hiiragi, Yukinobu; Kawasaki, Tsubasa; Kurihara, Tomohisa; Ohmi, Yorikatsu

    2016-07-01

    [Purpose] This study aimed to investigate the relatedness, reliability, and validity of isometric muscle strength measurements of hip abduction and abduction with an external hip rotation in a bent-hip position using a handheld dynamometer with a belt. [Subjects and Methods] Twenty healthy young adults, with a mean age of 21.5 ± 0.6 years were included. Isometric hip muscle strength in the subjects' right legs was measured under two posture positions using two devices: a handheld dynamometer with a belt and an isokinetic dynamometer. Reliability was evaluated using an intra-class correlation coefficient (ICC); relatedness and validity were evaluated using Pearson's product moment correlation coefficient. Differences in measurements of devices were assessed by two-way ANOVA. [Results] ICC (1, 1) was ≥0.9; significant positive correlations in measurements were found between the two devices under both conditions. No main effect was found between the measurement values. [Conclusion] Our findings revealed that there was relatedness, reliability, and validity of this method for isometric muscle strength measurements using a handheld dynamometer with a belt. PMID:27512280

  6. The Utilization of Wireless Handheld Computers with MEDLINE is an Effective Mechanism for Answering Clinical Questions at the Point of Care. A Review of: Hauser, Susan E., Dina Demner-Fushman, Joshua L. Jacobs, Susanne M. Humphrey, Glenn Ford, and George R. Thoma. “Using Wireless Handheld Computers to Seek Information at the Point of Care: An Evaluation by Clinicians.” Journal of the American Medical Informatics Association 14.6 (Nov./Dec. 2007): 807-15.

    OpenAIRE

    Martha Ingrid Preddie

    2008-01-01

    Objective – To assess the effectiveness of wireless handheld computers (HHCs) for information retrieval in clinical environments and the role of MEDLINE in answering clinical questions at the point of care. Design – A prospective single-cohort study.Setting – Teaching rounds in the intensive care units and general medicine wards in two hospitals associated with a university’s school of medicine in the United States. Subjects – Five internal medicine residents with training in evidence-bas...

  7. The use of hand-held 35 mm color infrared imagery for estimates of suspended solids - A progress report. [in water pollution monitoring

    Science.gov (United States)

    Miller, W. F.; Whisler, F. D.; Robinette, H. R.; Finnie, D.; Cannon, T.

    1975-01-01

    A cost-effective aerial surveillance technique is proposed for detection and identification of suspended solids which would be operational for both governmental monitoring organizations and private individuals operating catfish farms. Sixteen catfish ponds were flown daily for seven days using two hand-held 35 mm cameras with both Kodachrome X and Ektachrome infrared film. Hue, value, and chroma designations were recorded for each pond on each date by three interpreters, and the accepted color was that recorded by at least two of the interpreters, or if there was a three hue range, the median was accepted. Relations between suspended solids and color designations were analyzed graphically, and chroma was discarded due to an apparent lack of correlation. The data obtained were then analyzed by multiple regression. Significant correlations were revealed between hue and value and total and inorganic suspended solids. If perfected, this technique could be developed to sufficent accuracy for large-scale reconnaissance surveys to monitor the quality of rivers and streams.

  8. Large-area, uniform and low-cost dual-mode plasmonic naked-eye colorimetry and SERS sensor with handheld Raman spectrometer

    CERN Document Server

    Xu, Zhida; Wang, Xinhao; Han, Kevin; Ameen, Abid; Khan, Ibrahim; Chang, Te-Wei; Liu, Gang Logan

    2016-01-01

    We demonstrated a highly sensitive, waferscale, highly uniform plasmonic nanomushroom substrate based on plastic for nakedeye plasmonic colorimetry and surface enhanced Raman spectroscopy (SERS). We gave it the name FlexBrite. The dualmode functionality of FlexBrite allows for label-free qualitative analysis by SERS with an enhancement factor (EF) of 10^8 and labelfree quantitative analysis by naked eye colorimetry with a sensitivity of 611 nm RIU-1. The SERS EF of FlexBrite in the wet state was found to be 4.81 X 10^8, 7 times stronger than in the dry state, making FlexBrite suitable for aqueous environments such as microfluid systems. The labelfree detection of biotin streptavidin interaction by both SERS and colorimetry was demonstrated with FlexBrite. The detection of trace amounts of the narcotic drug methamphetamine in drinking water by SERS was implemented with a handheld Raman spectrometer and FlexBrite. This plastic based dual-mode nano-mushroom substrate has the potential to be used as a sensing pla...

  9. The Use of Handheld X-Ray Fluorescence (XRF) Technology in Unraveling the Eruptive History of the San Francisco Volcanic Field, Arizona

    Science.gov (United States)

    Young, Kelsey E.; Evans, C. A.; Hodges, K. V.

    2012-01-01

    While traditional geologic mapping includes the examination of structural relationships between rock units in the field, more advanced technology now enables us to simultaneously collect and combine analytical datasets with field observations. Information about tectonomagmatic processes can be gleaned from these combined data products. Historically, construction of multi-layered field maps that include sample data has been accomplished serially (first map and collect samples, analyze samples, combine data, and finally, readjust maps and conclusions about geologic history based on combined data sets). New instruments that can be used in the field, such as a handheld xray fluorescence (XRF) unit, are now available. Targeted use of such instruments enables geologists to collect preliminary geochemical data while in the field so that they can optimize scientific data return from each field traverse. Our study tests the application of this technology and projects the benefits gained by real-time geochemical data in the field. The integrated data set produces a richer geologic map and facilitates a stronger contextual picture for field geologists when collecting field observations and samples for future laboratory work. Real-time geochemical data on samples also provide valuable insight regarding sampling decisions by the field geologist

  10. Evaluation of Three Commercial Handheld Ultra-Low-Volume Foggers with Aqualure® 20-20 Against Adult Aedes albopictus.

    Science.gov (United States)

    Camelio, Kinsey; Gibson, Jennifer; Smith, Michael L; Drake, Lisa L; Xue, Rui-De

    2016-06-01

    The Anastasia Mosquito Control District (AMCD) tests all equipment before field use to determine if machines are suitable for the needs of the district. Three handheld ultra-low-volume (ULV) foggers--the American LongRay (ULV) Fogger Model 3600B with rechargeable lithium battery (DC model), American LongRay ULV Fogger Model 3600E with 110V or 220V AC power (AC model), and Boston Fog Battery Motorized Fogger (Boston Fogger)--were compared to determine which fogger would be most suitable for use by AMCD. Mortality of caged Aedes albopictus was analyzed after 24 h to determine the success of a single application. All 3 foggers resulted in 100% mortality after 24 h using the insecticide Aqualuer 20-20 (active ingredients permethrin 20.6% and piperonyl butoxide 20.6%) 1:5 dilution with reverse osmosis water. Based on operator safety, robustness, and operational performance, the American LongRay DC model was found to be the most suitable at administering Aqualuer 20-20 against caged adult Ae. albopictus. PMID:27280357

  11. Design of Handheld Wire Rope Laser Cutting System%手提式钢缆激光切割系统的设计

    Institute of Scientific and Technical Information of China (English)

    何琼; 杨晟; 王英

    2012-01-01

    This article mainly introduce a handheld laser cutting system for wire rope which used for fiber transferring. By the use of pulsed solid laser,we chose fibers as flexible transmission, designed a special clamping apparatus for rope cutting. Furthermore, we also did some research on its cutting technologies. With the optimized discharge current, pulsed frequency, pulsed width and assisted gas pressure, this system now can meet cutting requirements up to diameter 12 mm wire rope which affords a new approach to rope cutting field.%介绍了一种手提式光纤传输钢缆激光切割系统.以脉冲固体激光器作为光源,采用光纤进行柔性传输,设计了切割钢缆的专用夹具,研究了钢缆的切割工艺.通过优化放电电流、脉冲频率、脉冲宽度、辅助气压等参数,该系统可满足直径12 mm内的钢缆的切割要求,提供了切割钢缆的新方法.

  12. Evaluation of portable Raman spectroscopy and handheld X-ray fluorescence analysis (hXRF) for the direct analysis of glyptics

    Science.gov (United States)

    Lauwers, D.; Candeias, A.; Coccato, A.; Mirao, J.; Moens, L.; Vandenabeele, P.

    2016-03-01

    In archaeometry, the advantages of a combined use of Raman spectroscopy and X-ray fluorescence spectroscopy are extensively discussed for applications such as the analysis of paintings, manuscripts, pottery, etc. Here, we demonstrate for the first time the advantage of using both techniques for analysing glyptics. These engraved gemstones or glass materials were originally used as stamps, to identify the owner, for instance on letters, but also on wine vessels. For this research, a set of 64 glyptics (42 Roman glass specimens and 22 modern ones), belonging to the collection of the museum 'Quinta das Cruzes' in Funchal (Madeira, Portugal), was analysed with portable Raman spectroscopy and handheld X-ray fluorescence (hXRF). These techniques were also used to confirm the gemological identification of these precious objects and can give extra information about the glass composition. Raman spectroscopy identifies the molecular composition as well as on the crystalline phases present. On the other hand, hXRF results show that the antique Roman glass samples are characterised with low Pb and Sn levels and that the modern specimens can be discriminated in two groups: lead-based and non-lead-based ones.

  13. Repurposed automated handheld counter as a point-of-care tool to identify individuals 'at risk' of serious post-ivermectin encephalopathy.

    Directory of Open Access Journals (Sweden)

    Sasisekhar Bennuru

    2014-09-01

    Full Text Available Administration of ivermectin (IVM as part of mass drug administration (MDA campaigns for onchocerciasis and/or lymphatic filariasis (LF has been suspended in areas co-endemic for Loa loa due to severe post-treatment adverse events (SAEs associated with high-burden of infection (>30,000 mf/ml. One simple approach for preventing SAEs is to identify and exclude individuals at risk from MDA. Here, we describe a repurposed hand-held automated cell counter (Scepter 2.0; HHAC as a rapid, point-of-care method for quantifying microfilariae (mf in the blood of infected individuals.The quantification of microfilarial levels in blood of naturally infected humans, experimentally infected baboons, or mf-spiked human blood was tested using a microfluidic-based automated counter and compared to traditional calibrated thick-smears. We demonstrate that mf can be quantified in 20 µl of whole blood following lysis with 10% saponin within a minute of obtaining blood. There was a highly significant concordance between the counts obtained by the HHAC and those by microscopy for mf densities of >5,000 (p30,000 per ml (p<0.0001, r(c = 0.90. Preliminary proof of concept field studies in Cameroon with 20 µl of blood from L. loa infected humans (n = 22 and baboons (n = 4 also demonstrated a significantly high concordance (p<0.0001, r(c = 0.89 with calibrated thick blood smears counts.A repurposed HHAC is a portable, sensitive, rapid, point-of-care and quantitative tool to identify individuals with high levels of L. loa mf that put them at risk for SAEs following MDA. In addition, it provides ease of data storage and accessibility.

  14. Handheld Tube Body Imperfection Measuring Template Design%手持式管体缺欠测量模板设计

    Institute of Scientific and Technical Information of China (English)

    唐盛; 张亚葛; 何亚军

    2015-01-01

    At present, in consideration of some bigger measurement errors existed in steel pipe surface measurement methods, a kind of aided measure template was designed and machined, and it was used in production site. The results indicated that the designed handheld measure template is with larger moving space;it is easier to avoid the influence of raised grain, roll marks etc. near the measurement points, which ensured the accuracy of the measurement results. This measure template not only can directly measure steel pipe shape deviation, including peak, flat spots, dents, weld size and offset, but also accurately measure weld height and offset of small diameter steel pipe.%针对钢管外观检测中目前使用的测量方法误差较大的情况,设计加工了一种辅助测量模板,并在生产现场进行实际使用。结果表明,所设计的辅助测量模板具有较大的移动空间,测量时更容易避开测量点附近的波浪纹、辊痕等的影响,保证了测量结果的准确性。该模板可直接用于钢管的形状偏差包括噘嘴、扁平块、摔坑以及焊缝尺寸和错边的测量,也可以用于小直径钢管焊缝高度、错边量的精确测量。

  15. Research into Fruit Battery by Handheld Sensor%利用手持技术对水果电池的实验探究

    Institute of Scientific and Technical Information of China (English)

    席艳丽

    2012-01-01

    Therough exploring the fruit battery by handheld sensor, the different types of fruit battery consisted by fruit and the metal electrode were studied. In order to getting the best experimental conditions, the composition of the fruit battery electrodes, electrode spacing, depth electrode inserted in the fruits and the battery connection conditions were carried out experiments. The results showed that fruits containing plenty of tartaric acid, the greater the metal reactivity between the two electrodes and the smaller the distance of the two electrodes, the better the effect of fruit battery was. Serial or parallel were conductive to increasing the voltage of fruit battery, but were not multiplied.%通过手持技术对水果电池进行探究,研究不同种类水果与金属电极组成的水果电池,围绕组成水果电池所使用的电极、电极间距、电极在水果中插入的深度和连接方式等条件展开实验,得到了最佳的实验条件:含果酸丰富的水果,两电极之间的金属活泼性相差越大,两电极间距离越小,其组成的水果电池效果越好,串联或并联都有利于增大水果电池的电压,但都不是成倍增加的。

  16. Reliability of hand-held dynamometry for measurement of lower limb muscle strength in children with Duchenne and Becker muscular dystrophy

    Directory of Open Access Journals (Sweden)

    Wei SHI

    2015-05-01

    Full Text Available Objective To determine the reliability of hand-held dynamometry (HHD for lower limb isometric muscle strength measurement in children with Duchenne and Becker muscular dystrophy (DMD/BMD.  Methods A total of 21 children [20 males and one female; mean age was (7.88 ± 2.87 years, ranging between 3.96-14.09 years; mean age at diagnosis was (5.88 ± 2.88 years, ranging between 1.35-12.89 years; mean height was (120.64 ± 16.30 cm, ranging between 97-153 cm; mean body weight was (24.62 ± 9.05 kg, ranging between 14-50 kg] with DMD (19/21 and BMD (2/21 were involved from Rehabilitation Center of Children's Hospital of Fudan University. The muscle strength of hip, knee and ankle was measured by HHD under standardized test methods. The test-retest results were compared to determine the inter-test reliability, and the results among testers were compared to determine the inter-tester reliability.  Results HHD showed fine inter-tester reliability (ICC = 0.762-0.978 and inter-test reliability (ICC = 0.690-0.938 in measuring lower limb muscle strength of children with DMD/BMD. Results also showed relatively poor reliability in distal muscle groups (foot plantar flexion and dorsiflexion.  Conclusions HHD, showing fine inter-tester and inter-test reliability in measuring the lower limb muscle strength of children with DMD/BMD, can be used in monitoring muscle strength changing and assessing effects of clinical interventions. DOI: 10.3969/j.issn.1672-6731.2015.05.009

  17. An Approach to Precise Nitrogen Management Using Hand-Held Crop Sensor Measurements and Winter Wheat Yield Mapping in a Mediterranean Environment

    Directory of Open Access Journals (Sweden)

    Lucía Quebrajo

    2015-03-01

    Full Text Available Regardless of the crop production system, nutrients inputs must be controlled at or below a certain economic threshold to achieve an acceptable level of profitability. The use of management zones and variable-rate fertilizer applications is gaining popularity in precision agriculture. Many researchers have evaluated the application of final yield maps and geo-referenced geophysical measurements (e.g., apparent soil electrical conductivity-ECa as a method of establishing relatively homogeneous management zones within the same plot. Yield estimation models based on crop conditions at certain growth stages, soil nutrient statuses, agronomic factors, moisture statuses, and weed/pest pressures are a primary goal in precision agriculture. This study attempted to achieve the following objectives: (1 to investigate the potential for predicting winter wheat yields using vegetation measurements (the Normalized Difference Vegetation Index—NDVI at the beginning of the season, thereby allowing for a yield response to nitrogen (N fertilizer; and (2 evaluate the feasibility of using inexpensive optical sensor measurements in a Mediterranean environment. A field experiment was conducted in two commercial wheat fields near Seville, in southwestern Spain. Yield data were collected at harvest using a yield monitoring system (RDS Ceres II-volumetric meter installed on a combine. Wheat yield and NDVI values of 3498 ± 481 kg ha−1 and 0.67 ± 0.04 nm nm−1 (field 1 and 3221 ± 531 kg ha−1 and 0.68 ± 0.05 nm nm−1 (field 2 were obtained. In both fields, the yield and NDVI exhibited a strong Pearson correlation, with rxy = 0.64 and p < 10−4 in field 1 and rxy = 0.78 and p < 10−4 in field 2. The preliminary results indicate that hand-held crop sensor-based N management can be applied to wheat production in Spain and has the potential to increase agronomic N-use efficiency on a long-term basis.

  18. VALIDATION OF ANSI N42.34 AMERICAN NATIONAL STANDARD PERFORMANCE CRITERIA FOR HAND-HELD INSTRUMENTS FOR THE DETECTION AND IDENTIFICATION OF RADIONUCLIDES

    Energy Technology Data Exchange (ETDEWEB)

    Lorier, T.

    2014-09-03

    SRNL’s validation of ANSI N42.34-D6 for the Domestic Nuclear Detection Office (DNDO) was performed utilizing one hand-held instrument (or RID) – the FLIR identiFINDER 2. Each section of the standard was evaluated via a walk-through or test. NOTE: In Table 1, W = walk-through and T = test, as directed by the Domestic Nuclear Detection Office (DNDO). For a walk-through, the experiment was either setup or reviewed for setup; for a test, the N42.34-D6 procedures were followed with some exceptions and comments noted. SRNL is not fully able to evaluate a RID against Sections 7 (Environmental), 8 (Electromagnetic), and 9 (Mechanical) of N42.34, so those portions of this validation were done in collaboration with Qualtest, Inc. in Orlando, Florida. The walk-throughs and tests of Sections 7, 8, and 9 were performed in Qualtest, Inc. facilities with SRNL providing radiological sources as necessary. Where applicable, assessment results and findings of the walk-throughs and tests were recorded on datasheets and a validation summary is provided. A general comment pertained to test requirements found in another standard and referenced in N42.34-D6. For example, step 1 of the test method in section 8.1.2 states “RF test set up information can be found in IEC 61000-4-3.” It is recommended that any information from other standards necessary for conducting the tests within N42.34 should be posted in N42.34 for simplicity and to prevent the user from having to peruse other documents. Another general comment, as noted by Qualtest, is that a tolerance reference is not listed for each test in sections 7-9. Overall, the N42.34-D6 was proven to be practicable, but areas for improvement and recommendations were identified for consideration prior to final ballot submittal.

  19. Application of handheld GPS to grassland resource investigation and mapping%手持GPS在草原调查与制图中的应用

    Institute of Scientific and Technical Information of China (English)

    王大为; 赵军; 付鹏; 师银芳; 杨东辉

    2012-01-01

    Global Positioning System (GPS) is a much rapid development information technology system, and its application areas have transferred into the daily production and life from the initial high-end military area. Application of GPS technology to grassland survey is the trend of digitization and informatization of grassland survey. This study introduced the application of the Trimble Juno SB handheld receiver in the process of grassland survey at the various stages, and summarized and generalized the technology and method in grassland investigation and mapping, which would provide the information for grassland resource investigation and mapping by GIS technology.%全球定位系统(GPS)是当代发展非常迅速的信息技术系统,运用领域也由最初的高端军事领域深入到日常的生产生活中。运用GPS技术进行草原调查,是草原调查数字化、信息化的趋势。本研究介绍了Trimble Juno SB手持机在草原调查中各阶段的应用,系统地总结归纳了手持GPS在草原调查与制图中的应用技术和方法,为应用GPS技术开展草原资源调查与制图工作提供参考。

  20. 手持GPS接收机在水利勘测中的应用%Application of Handheld GPS Receiver in Water Conservancy Investigation

    Institute of Scientific and Technical Information of China (English)

    宫俊

    2012-01-01

    In order to explore and research the new method and new thought about land requisition survey in the feasibility study stage of the super-dike,namely scenic road project along northern bank of the Songhua River in Harbin City,guarantee effectively the correction of the land use status and the surveyed results on both sides of the super-dike,Surveying Department of Heilongjiang Provincial Water Conservancy Hydroelectric Power Investigation,Design and Research Institute explored a set of the procedure and method applying handheld GPS receiver in land requisition survey for super-dike and scenic road project and provided a new technological way and method for land requisition survey.%为创新研究哈尔滨松花江北岸"超级堤"暨景观大道,征地调查可研阶段的新方法新思路,有效地保证"超级堤"两侧土地利用现状调查成果的现势性和准确性,黑龙江省水利水电勘测设计研究院测绘处在承担哈尔滨市江北"超级堤"暨景观大道征地测量中,探索出一套手持GPS接收机应用于该测量征地调查的程序和方法,为征地调查提供了新的技术途径与方法。

  1. A novel 1050nm handheld OCT imaging system for pediatric retinoblastoma patients: translation from laboratory bench to clinical study (Conference Presentation)

    Science.gov (United States)

    Nadiarnykh, Oleg; Moll, Annette C.; de Boer, Johannes F.

    2016-03-01

    We demonstrate a novel optical coherence tomography system specifically developed and validated for clinical imaging of retinoblastoma tumors in pediatric patients. The existing treatment options for this malignant tumor of the retina aim at reduction of tumor (re)growth risks, and vision preservation. The choice of optimal treatment strongly depends on skilled and detailed clinical assessment. Currently, the patients at risk are periodically monitored with retinal imaging for possible morphological changes over time, and new tumor seedings, as the existing real-time diagnostic tools are limited. Three-dimensional visualization of tissue layer and microvasculature at improved axial and lateral resolution of interference-based OCT imaging provides sensitivity for detection of vital tumor tissue concurrent with local treatment. Our METC-approved system accommodates for the range of optical parameters of infants' eyes, and uses the 1050nm wavelength to access the deeper choroid layers of retina. The prototype is designed for patients in supine position under general anesthesia, where ergonomic handheld module is connected to fiber-based optical setup via umbilical cord. The system conforms to clinical safety requirements, including fully isolated low-voltage electric circuit. Focusing is performed with a mechanically tunable lens, where resolution is 6 µm axially, and varies with focusing at 10-18µm laterally. We will present optical design, performance limitations, and results of the ongoing clinical study, including the increased OCT diagnostic sensitivity in three dimensions in comparison with the established clinical imaging modalities. We will discuss images of early, active, and treated tumors, as well as follow-up on patients after local and systemic treatments.

  2. A Case of Hydranencephaly in Which Ophthalmic Examinations Were Performed

    Directory of Open Access Journals (Sweden)

    Shohei Eda

    2016-09-01

    Full Text Available Purpose: We performed ophthalmic examinations, including optical coherence tomography (OCT, on a case diagnosed with hydranencephaly. Case Report: This case involved a female infant born at the gestational age of 35 weeks and 4 days, with the birth weight of 2,152 g, who was one of monochorionic diamniotic twins, and the identical twin died in utero at the gestational age of 24 weeks. After that, examination by fetal echo indicated that she had microcephaly and ventriculomegaly. Postnatal magnetic resonance imaging (MRI of her head indicated microcephaly and significant enlargement of the lateral ventricle on both sides, with no obvious signs of elevated intracranial pressure. The brain parenchyma of both sides of the frontal lobe, parietal lobe, and occipital lobe had marked thinning, yet that of the temporal lobe, basal ganglia, thalamus, brain stem, and cerebellum had been maintained. Moreover, no obvious hematoma or neoplastic lesions were observed. Ophthalmic examinations indicated that both of her eyes had slight light reflex, attributed to optic nerve atrophy. Examination by use of a hand-held OCT system indicated a layered structure of the retina and thinning of the ganglion cell layer. Flicker electroretinogram (ERG examination by use of a hand-held ERG system indicated an almost normal wave. However, no clear visual reaction was observed when she was 10 months old. Conclusion: Our findings in this case of hydranencephaly revealed that even though the outer layer functions of the patient’s retina were maintained, extensive damage to her cerebral cortex resulted in poor visual function.

  3. Feasibility Analysis of Using Handheld Electromagnetic Current Meter in Small and Medium-sized Rivers Survey%手持式电波流速仪在中小河流巡测中的可行性研究

    Institute of Scientific and Technical Information of China (English)

    郑应成

    2013-01-01

    To verify the results of the flow measurement which is measured by a handheld electromagnetic current meter whether meets the test standard and the feasibility of velocity-area method flow measurement, based on an introduction measuring principle and specification of the instrument, the paper analyzes its calibration results in the current calibration tank. Comparing its flow measurement results with measurement results by using traditional current meter and ADCP in small or middle rivers, it testifies that the accuracy of flow measurement result made directly by handheld electromagnetic current meter meets the requirement of hydrometric tour gauging of medium and small rivers. It can provide theoretical and technical reference for widely using handheld electromagnetic current meter in small and medium-sized rivers survey in future.%  为验证在中小河流巡测中使用手持电波流速仪测流的结果是否符合测验规范要求及流速面积法测流的可行性,在介绍仪器测量原理、技术指标的基础上,分析手持式电波流速仪在流速仪检定水槽的校准结果;通过与传统流速仪、ADCP在中小河流实际测流工作中的比测分析,说明在中小河流巡测中,手持电波流速仪直接测流的精度是满足工作要求的,可为今后在中小河流巡测中广泛使用手持电波流速仪提供理论和技术上的参考。

  4. 手持式电动工具产品日常检测不合格项目及原因浅析%Unqualified Items and Cause Analysis in Hand-held Electric Tools Routine Test

    Institute of Scientific and Technical Information of China (English)

    高家材; 陈其勇; 郑小龙

    2015-01-01

    基于日常检测尤其是CCC检测和监督抽查以及各类地方抽查的试验,介绍手持式电动工具在测试过程中常见的不合格项目,对不合格项目的产生原因进行简要分析.%Based on the routine test, especially the CCC certification, supervision and various local spot check, introduce the common unqualified items during the process in the hand-held electric tools test, and analyze the cause of the unqualified items briefly.

  5. 简介手持式电动工具爬电距离和电气间隙的测量试验%The Measuring Test of Creepage Distance and Clearance on Hand-held Electric Tools

    Institute of Scientific and Technical Information of China (English)

    戴胜岳

    2014-01-01

    基于对《手持式电动工具的安全第一部分:通用要求》具体章节的理解,通过图例方式对爬电距离和电气间隙测量的试验方法和注意事项做简单介绍。%According to the understanding of Safety of hand-held moter-operated electric tools-part 1:General requirement, to make a simple introduction of creepage distance and clearance test methods and notes by illustration.

  6. Evaluation of a hand-held far-ultraviolet radiation device for decontamination of Clostridium difficile and other healthcare-associated pathogens

    Directory of Open Access Journals (Sweden)

    Nerandzic Michelle M

    2012-05-01

    Full Text Available Abstract Background Environmental surfaces play an important role in transmission of healthcare-associated pathogens. There is a need for new disinfection methods that are effective against Clostridium difficile spores, but also safe and rapid. The Sterilray™ Disinfection Wand device is a hand-held room decontamination technology that utilizes far-ultraviolet radiation (185-230 nm to kill pathogens. Methods We examined the efficacy of disinfection using the Sterilray device in the laboratory, in rooms of hospitalized patients, and on surfaces outside of patient rooms (i.e. keyboards and portable medical equipment. Cultures for C. difficile, methicillin-resistant Staphylococcus aureus (MRSA, and vancomycin-resistant Enterococcus (VRE were collected from commonly-touched surfaces before and after use of the Sterilray device. Results On inoculated surfaces in the laboratory, application of the Sterilray device at a radiant dose of 100 mJ/cm2 for ~ 5 seconds consistently reduced recovery of C. difficile spores by 4.4 CFU log10, MRSA by 5.4 log10CFU and of VRE by 6.9 log10CFU. A >3 log10 reduction of MRSA and VRE was achieved in ~2 seconds at a lower radiant dose, but killing of C. difficile spores was significantly reduced. On keyboards and portable medical equipment that were inoculated with C. difficile spores, application of the Sterilray device at a radiant dose of 100���mJ/cm2 for ~ 5 seconds reduced contamination by 3.2 log10CFU. However, the presence of organic material reduced the lethal effect of the far-UV radiation. In hospital rooms that were not pre-cleaned, disinfection with the Sterilray device significantly reduced the frequency of positive C. difficile and MRSA cultures (P =0.007. Conclusions The Sterilray™ Disinfection Wand is a novel environmental disinfection technology that rapidly kills C. difficile spores and other healthcare-associated pathogens on surfaces. However, the presence of organic matter

  7. 基于手持设备的室内定位系统设计与实现%Design and implement an indoor location system based on handheld device

    Institute of Scientific and Technical Information of China (English)

    胡天琨; 叶建芳

    2012-01-01

    Designing an indoor location system based on handheld device to resolve the matter that cannot use GPS for indoor location. This system has two feature, the first is combining the inertial positioning and WiFi positioning; the second is the system is very simple, just need a handheld device that include WiFi, compass, inertial sensor. Present a path matching algorithm used in inertial positioning and site estimated algorithm used in WiFi positioning. It has been found that the precision of system is less than 4 m.%为解决无法在室内使用GPS的问题,设计并实现了基于常用手持设备(如手机、平板电脑)的室内定位系统。系统融合了传统的惯性定位方法和基于WiFi信号强度定位方法,易于搭建,仅需一个包含惯性传感器、电子罗盘、WiFi扫描的手持设备。提出了惯性定位中的路径匹配算法和WiFi信号定位方法中的位置估计算法。经实际测试,系统定位精度小于4m。

  8. Design and experiment on handheld air-assisted pollination device%手持式风送授粉机研制与试验

    Institute of Scientific and Technical Information of China (English)

    丁素明; 薛新宇; 蔡晨; 秦维彩; 方金豹; 孙竹

    2014-01-01

    Pollination is a very important process for high yield and quality of fruits production. The artificial and bee pollinations are wildly used in fruits production, but they are unadaptable to large scale production. So a kind of handheld air-assisted pollination device was developed. Through theoretical calculation, the air supply device was determined to adopt 6 impellers, the impeller diameter is 38 mm and the guide blades width is 18 mm. The motor is driven by DC power. A wind velocity indicator was used and the test ring was put at 500 mm ahead of the air inlet which is connected with a set of rams to fan pipes. The ram’s diameter is 38 mm, same as the impeller. The results of fan performance test showed that the air volume was 3.0×10-3m3/s at 8 000 r/min of fan speed, which can meet the design requirements. The highest total pressure efficiency is 43% at 9 000 r/min of fan speed. With the speed increase, the total pressure efficiency dropped rapidly but the power increased and the variation trends of the air volume and air pressure are not significant. The fan property was tested and the performance curve graphic was drawn. The air velocity field at different rotational speeds of the handheld air-assisted pollination device were studied and validated by the experiment data. The results showed that the velocity of central plane diffused at a fixed angle and decayed along the centre line, and the theoratical values closely related to the experiment data. In order to study the effect of airflow speed on pollination, the basic principle of pneumatic pollination was analyzed. Tests were conducted to validate the effect of airflow speed on pollens distribution based on pollens density, horizontal distribution and vertical distribution in the lab. The results show that the flow rate of nozzle is affected by wind velocity significantly. When the winds velocity reaches 25 m/s, the variation trends of the flow rate of nozzle are not significant with the speed increase

  9. Collaborative Handheld Gaming in Education

    Science.gov (United States)

    Lim, Kenneth Y. T.; Wang, Jason Y. Z.

    2005-01-01

    This project describes the trialling of a new form of cooperative learning strategy, in the form of a game known as "EcoRangers". "EcoRangers" is a multi-player game designed to run on mobile phones, written specifically for education. "EcoRangers" is one of the first, if not the world's first, instances of this totally new genre of pedagogical…

  10. The designing of Hand-held boiler with the monitor%手持式电站锅炉配风监测仪的设计

    Institute of Scientific and Technical Information of China (English)

    刘勇; 朱杰斌

    2011-01-01

    In view of the current boiler burner field patrol, maintenance equipment, developed a crushing handheld boiler with the wind, it is imperative to monitor. Based on the understanding of pulverized coal boiler with the working principle of the monitoring system,and based on the principle of measurement, the calibration of the first ever speed, the measuring element differential transmission device to measure the internal pressure sensor measuring pressure; send out variable Secondly anemometer can be calculated by wind, By three again for measuring temperature and air temperature, coal powder mixture platinic resistance sensor, the temperature of the measured value and calculated according to the principle of thermal pulverized coal concentration. Mainly introduces the basic circuit design hardware structure and low power circuit design, the key is presented, the main program software flowchart monitoring and presented with FengYi boiler pressure measurement results and meet the design requirements. The experiment proves, plant technical personnel, use convenient,reliable operation cost is low, have a high application value.%针对当前电站锅炉燃烧器的现场巡视、检修设备的溃乏,研制一种手持式电站锅炉配风监测仪势在必行.基于在了解电站锅炉煤粉配风监测系统的工作原理以及测量工作原理的基础上,首先采用经标定过的测速元件测量,经差压变速器送到测量装置内部的压力传感器变送测量出动压;其次由测速原理可以计算出风速;再次由三支分别用于测量热风温度、煤粉温度和风粉混合温度的铂电阻传感器所测得的温度值,根据热平衡原理计算出煤粉浓度.重点介绍了基本设计电路硬件结构以及关键低功耗电路设计,既给出了监测仪主程序软件流程图,又给出了电站锅炉配风仪动压测量的结果分析,达到了设计的要求.经电厂技术人员试验证明,运行可靠,使用方便,成本低,有较高的推广价值.

  11. 手持式电动工具防止触及带电零件的保护试验%Protection against Access to Live Parts Test of Hand-held Electric Tools

    Institute of Scientific and Technical Information of China (English)

    王韦华

    2014-01-01

    According to the understanding of the standard of protection against access to live parts test of hand-held electric tools, brief introduce the test methods and results determination by legends, including the test equipments, test methods, results determination and precautions.%根据对手持式电动工具防止触及带电零件试验的标准理解,通过图例对该试验方法和结果判定作简单介绍,包括试验设备、试验方法、结果判定以及注意事项等方面。

  12. 手持式电动工具用轴承性能浅析%Brief Performance Analysis on the Bearings Applied to Hand-held Motor-operated Electric Tools

    Institute of Scientific and Technical Information of China (English)

    张永恩; 方承志; 宋贵州; 李兴林

    2014-01-01

    Deep groove ball bearings, represented in the tool assembly without considering other factors, combined with the relevant sections of the power tool safety standards, the content mainly discusses several performance requirements of the bearings applied to hand-held motor-operated electric tools and their relationship and effects with safety standard. This content can also be referenced while make technical design and quality appraisal.%以深沟球轴承为代表,在不考虑工具装配等因素的前提下,结合电动工具安全标准的相关章节,讨论并分析手持式电动工具用滚动轴承的主要性能和要求,可供设计选用和质量评价时参考。

  13. 基于用户需求的家用电动工具造型设计研究%Research on Household Hand-held Electric Tools Sculpting Design Based on User Demand

    Institute of Scientific and Technical Information of China (English)

    李刚

    2015-01-01

    基于产品造型设计相关理论,在功能、美学和经济性要求的基础上,分析探讨多学科优化设计原理、系列化设计原理、产品基因原理与协同设计等原则应用于家庭用手持式电动工具系列产品,并进行实例设计.%Based on the related theory of sculpting design and on the basis of function, aesthetic and economic requirements, analyze and discuss the multidisciplinary optimization design principle, series design principle, product gene principle and collaborative design principle, applying to household hand-held power tool series products and instantiate the design.

  14. Three Case Reports of Successful Vibration Therapy of the Plantar Fascia for Spasticity Due to Cerebral Palsy-Like Syndrome, Fetal-Type Minamata Disease.

    Science.gov (United States)

    Usuki, Fusako; Tohyama, Satsuki

    2016-04-01

    Fetal-type Minamata disease is caused by the exposure to high concentrations of methylmercury in the fetal period and shows cerebral palsy-like clinical features. Relief of spasticity is a major task of rehabilitation to improve their activities of daily living. Here we report the effect of long-term vibration therapy on bilateral lower-limb spasticity in 3 patients with fetal-type Minamata disease. We used a simple, inexpensive, and noninvasive approach with hand-held vibration massagers, which were applied to the plantar fascia at 90 Hz for 15 minutes. The effect was observed soon after the first treatment and resulted in better performance of the repetitive facilitation. Vibration therapy for 1 year improved Modified Ashworth Scale for the ankle flexors in 2 cases. The labored gait improved and gait speed increased in another case. Continued vibration therapy for another 1 year further improved Modified Ashworth Scale score and range of motion of ankle dorsiflexion in 1 case. This case showed the decreased amplitude of soleus H-reflex after the 15-minute vibration therapy, suggesting that α-motor neuron excitability was suppressed. Vibration therapy using a hand-held vibration massager may offer safe and effective treatment for lower-limb spasticity in patients with chronic neurological disorders.

  15. Desenvolvimento de software oftalmológico para computação móvel Development of ophthalmologic software for handheld devices

    Directory of Open Access Journals (Sweden)

    Gustavo Teixeira Grottone

    2006-08-01

    do grupo Ultrascan foi de 20,93D. Resultado semelhante à média do grupo programa em estudo. Os desvios-padrão das amostras também foram semelhantes (4,53D. CONCLUSÃO: A precisão do programa testado foi semelhante a do aparelho de ultra-sonografia ocular Ultrascan, para a fórmula SRK/T. O funcionamento do programa se demonstrou estável sem travamentos nos testes efetuados. A utilização deste programa em unidades cirúrgicas onde exista a necessidade de troca ou recálculo da lente intra-ocular do paciente, é alternativa segura, móvel e portátil, que pode auxiliar o cirurgião na escolha de uma nova lente.INTRODUCTION: The formulas for calculation of intraocular lenses have evolved since the first theoretical formulas by Fyodorov. Among the second generation formulas, the SRK-I formula has a simple calculation, taking into account a calculation that only involved anteroposterior length, IOL constant and average keratometry. With the evolution of those formulas, complexicity increased making the reconfiguration of parameters in special situations impracticable. In this way the production and development of software for such a purpose, can help surgeons to recalculate those values if needed. PURPOSE: To idealize, develop and test a Brazilian software for calculation of IOL dioptric power for handheld computers. METHODS: For the development and programming of software for calculation of IOL, we used PocketC program (OrbWorks Concentrated Software, USA. We compared the results collected from a gold-standard device (Ultrascan/Alcon Labs with the simulation of 100 fictitious patients, using the same IOL parameters. The results were grouped for ULTRASCAN data and SOFTWARE data. Using SRK/T formula the range of those parameters included a keratometry varying between 35 and 55D, axial length between 20 and 28 mm, IOL constants of 118.7, 118.3 and 115.8. RESULTS: Using Wilcoxon test, it was shown that the groups do not differ (p=0.314. We had a variation in the

  16. Essential characteristics of hand-arm vibration in hand-held workpiece polishing%手持工件打磨作业手传振动基本特征调查

    Institute of Scientific and Technical Information of China (English)

    肖斌; 陈青松; 林瀚生; 温薇; 张丹英; 徐国勇; 严茂胜; 陈贵平

    2016-01-01

    Objective To study the occupational exposure characteristics of hand-transmitted vibration in hand-held workpiece polishing and to provide the basis for occupational hazard prevention and control technology research in this kind of job.Methods The questionnaire and on site occupational health investigation were used to study 4 typical enterprises of hand-held workpiece polishing .The study was conducted by filling forms by enterprise , personal interviews with administrative staffs and front-line workers, as well as on site visit.Results Among the 4 factories, there were 835 workers (22.4%) engaged in the hand-held workpiece polishing assignment .The principal vibrating tools used in these 4 factories were polishing machine , flint glazing machine and polishing wheel , and the workpiece polished by workers were button, toilet lid, thermos, mobile phone shell and golf head .The polishing workers were all equipped with noise reduction earplugs and anti-dust respirators , but they did not wear anti-vibration gloves . The hand-held workpiece polishing assignment has the characteristics including indirect and continuous vibration exposure and fine operation .Some workers used their knees and abdomens as the support to polish workpieces .The vibration exposure time was 6-11 h/d.The 4 hours energy equivalent frequency-weighted acceleration to vibration [ahw(4)]was 1.9-19.4 m/s2, with the maximum which exceeded the occupational exposure limit (5.0 m/s2), showing a wide range ahw(4) in the same enterprise.Conclusion Compared with the traditional vibrating tools , the hand-held workpiece polishing operation has different characteristics of hand-transmitted vibration such as more sophisticated machine structure , finer polishing ways , more influencing factors of vibration exposure level and more extensive body parts involved .%目的:了解手持工件打磨作业手传振动职业接触特征,为该类作业的职业危害防治控制技术研究提供依据。方法

  17. The Analysis of Abnormal Refraction in Children by Using Suresight Hand-held Autorefractor%Suresight手持式自动验光仪筛查儿童屈光异常情况分析

    Institute of Scientific and Technical Information of China (English)

    康映红; 李丽红; 李娜; 董俊媚; 姜轶; 卢军

    2013-01-01

    Objective To find out timely the condition of ametropia beyond normal ranges that might affect the eye vision by screening and analyzing the abnormal situation of children with ametropia in Kunming so as to make the diagnosis and treatment for amblyopia.Methods Refractive screening was performed among 1880 children aged 3 to 6 years old with Suresight hand-held autorefractor and cycloplegic refraction optometry was performed for those back to hospital so as to make a definite diagnosis.Results The screening indicated 261 of them coming to 381 eyes were with ametropia.The detection rate of ametropia eyes was 10.13%.The incidences of the ametropia in children aged 3,4,5 and 6 years old were 8.44%,10.32%,10.53% and 11.90% respectively.The chi-square test showed no statistical difference.Compared the ametropia results of Suresight hand-held autorefractor screening under the natural conditions with cycloplegic refraction,relatively spherical correlation coefficient was r=0.535 (P < 0.01) and cylindrical lens correlation coefficient was r=0.762 (P < 0.01).The correlation was statistically significant.Conclusion Refractive screening with Suresight hand-held autorefractor is suitable for preschool children.Static refractive examination should be conducted on those with ametropia as soon as possible so as to make a clear diagnosis.There exists obviously abnormal refraction in children aged 3,and the incidence of abnormal refraction increases with age continuously.%目的 筛查分析昆明市区儿童屈光异常情况,及时发现超出正常范围可能影响视力的屈光异常,以便早期诊断和治疗弱视.方法 使用Suresight手持式自动验光仪对昆明市区年龄3~6岁1 880名儿童进行屈光筛查.并对来院复查儿童进行睫状肌麻痹验光以明确诊断.结果 筛查屈光异常异常261人,共计381只眼,屈光异常眼检出率为10.13%.3、4、5、6岁儿童屈光异常眼的发生率分别为8.44%、10.32%、10.53

  18. 手持式压力测痛仪的信度及效度检验%Reliability and validity of the hand-held pressure algometer as a measuring instrument of pressure pain threshold

    Institute of Scientific and Technical Information of China (English)

    陈祢; 郭铁成; 许惊飞; 韦春霞

    2009-01-01

    目的 均较高(ICC>0.95),重测信度优于施测者间信度;根据同一施测者3次重复测量结果的均值所计算的施测者间信度高于单次测量的施测者间信度;肌筋膜痛患者激痛点与正常对照点的压痛阈差异具有统计学意义,激痛点压痛阈值与VAS评分呈显著的负相关.结论 手持式压力测痛仪测量正常健康人压痛阈时具有较高信度,其可作为量化评价激痛点疼痛敏感性的有效工具.%Objective To evaluate the test-retest and inter-rater reliability of the hand-held pressure algometer as a measuring instrument of pressure pain threshold(PPT).Method A total of 37 healthy subjects were recruited for reliability test.Three raters measured the PPT at 12 body sites of the subjects.Each rater conducted three trials on each site.In the validity test,10 patients with active trigger points in the upper trapezius were recruited and measured by one rater using the pressure algometer for PPT,the visual analogue scale(VAS)was also used to evaluate the pain intensity induced by the trigger point.The intraclass correlation coefficient and Spearman correlation coefficient were calculated to reflect the reliability and validity.Results The test-retest and inter-rater reliabilities were both high(ICC>0.95),with the measurements by one rater were more reliable than measurements by multiple raters.The inter-rater reliability of PPT measurement obtained by using the mean value of 3 trials was higher than any of the 3 trials alone.The PPT values of the trigger points were higher than those of the normal points,and there was a significantly negative correlation between the PPT values of the trigger points and the VAS scores.Conclusion The intra-and inter-rater PPT measurements in healthy subjects obtained with the hand-held pressure algometer were highly reliable.The algometer was valid for quantifying myofascial trigger point sensitivity.

  19. 手持式电动工具维修风险和零件选配技术研究%Research on Repair Risk and Component Matching Technology of Hand-held Electric Tools

    Institute of Scientific and Technical Information of China (English)

    金勇; 傅俊雅

    2014-01-01

    模拟手持式电动工具维修情况,对手持式电动工具的电源线、开关、碳刷以及抑制电容电感等关键零部件进行更换试验,按照相关的国家标准要求分别对替换后的安全、电磁兼容等项目进行测试和数据比对。分析常见的手持式电动工具关键零部件被替换为非原厂零件的特征。%We simulate key parts changing in maintenance and repair when using non original parts, mainly power supply cord, switch, brush and capacitor and inductance, doing lots of tests and data comparison according to the national standards of safety and electromagnetic compatible. We f ind out common characteristics that key parts are replaced by non-original parts in hand-held electric tools.

  20. 手持式三维激光扫描仪定位算法的研究%Research on the Positioning Algorithms of a Handheld 3d Scanner

    Institute of Scientific and Technical Information of China (English)

    秦绪红; 赵杰; 程俊廷

    2013-01-01

    Self-referencing algorithms of the handheld 3 d scanner was mainly dissussed.Finst the classical algorithms is introduced,including the iterative closest point (ICP) algorithm and the exhaustive distance algorithm,and it also introduces the defects that exist in these algorithms.Then three triangulation algorithms are introduced.Throagh experiment,the three triangulation algorithms is compared with the reference exhaustive-distance algorithm,and analysied the advantages and disadvantages of these algorithms.The resalts are used to determine the best of the three.%研究了手持式三维扫描仪的自定位算法,并提出了改进算法以弥补ICP算法和穷举法等经典定位算法的局限性.通过实验对比Delaunay四面体法、ICP算法、最小三角形法和频率三角形法的重构效率,实验结果表明频率三角形法更高效更稳定,在各种环境下均具有可行性.

  1. Nondestructive Handheld Fourier Transform Infrared (FT-IR) Analysis of Spectroscopic Changes and Multivariate Modeling of Thermally Degraded Plain Portland Cement Concrete and its Slag and Fly Ash-Based Analogs.

    Science.gov (United States)

    Leung Tang, Pik; Alqassim, Mohammad; Nic Daéid, Niamh; Berlouis, Leonard; Seelenbinder, John

    2016-05-01

    Concrete is by far the world's most common construction material. Modern concrete is a mixture of industrial pozzolanic cement formulations and aggregate fillers. The former acts as the glue or binder in the final inorganic composite; however, when exposed to a fire the degree of concrete damage is often difficult to evaluate nondestructively. Fourier transform infrared (FT-IR) spectroscopy through techniques such as transmission, attenuated total reflectance, and diffuse reflectance have been rarely used to evaluate thermally damaged concrete. In this paper, we report on a study assessing the thermal damage of concrete via the use of a nondestructive handheld FT-IR with a diffuse reflectance sample interface. In situ measurements can be made on actual damaged areas, without the need for sample preparation. Separate multivariate models were developed to determine the equivalent maximal temperature endured for three common industrial concrete formulations. The concrete mixtures were successfully modeled displaying high predictive power as well as good specificity. This has potential uses in forensic investigation and remediation services particularly for fires in buildings.

  2. The Utilization of Wireless Handheld Computers with MEDLINE is an Effective Mechanism for Answering Clinical Questions at the Point of Care. A Review of: Hauser, Susan E., Dina Demner-Fushman, Joshua L. Jacobs, Susanne M. Humphrey, Glenn Ford, and George R. Thoma. “Using Wireless Handheld Computers to Seek Information at the Point of Care: An Evaluation by Clinicians.” Journal of the American Medical Informatics Association 14.6 (Nov./Dec. 2007: 807-15.

    Directory of Open Access Journals (Sweden)

    Martha Ingrid Preddie

    2008-09-01

    Full Text Available Objective – To assess the effectiveness of wireless handheld computers (HHCs for information retrieval in clinical environments and the role of MEDLINE in answering clinical questions at the point of care. Design – A prospective single-cohort study.Setting – Teaching rounds in the intensive care units and general medicine wards in two hospitals associated with a university’s school of medicine in the United States. Subjects – Five internal medicine residents with training in evidence-based practice.Methods – While accompanying medical teams on teaching rounds for approximately four consecutive weeks, each resident used MD on Tap (an application for handheld computers on a TreoTM 650 PDA/cell phone to find answers in real time, to questions that were raised by members of the medical teams. Using a special version of MD on Tap, each resident initialized a UserID. Serving as evaluators, the residents described and categorized clinical scenarios and recognized questions. They also formulated search terms, searched MEDLINE and identified citations determined to be useful for answering the questions. An intermediate server collected details of all MEDLINE search query transactions, including system response time, the user (based on UserIDs, citations selected for viewing, the saving of citations to HHC memory, as well as use of the Linkout and Notes features. In addition evaluators submitted daily summaries. These summaries included information on the scenarios, clinical questions, evidence-based methodology (EBM category, the team member who was the source of the question, the PubMed Identifiers (PMIDs of relevant citations, and comments. At the end of the data collection period, each evaluator submitted a summary report consisting of a qualitative and quantitative evaluation of his experience using MEDLINE via the handheld device to find relevant evidence based information at the point of care. The report also focused on the usefulness

  3. Cell diameter measurements obtained with a handheld cell counter could be used as a surrogate marker of G2/M arrest and apoptosis in colon cancer cell lines exposed to SN-38

    Energy Technology Data Exchange (ETDEWEB)

    Tahara, Makiko [Oncogene Research Unit/Cancer Prevention Unit, Tochigi Cancer Center Research Institute, Utsunomiya, Tochigi (Japan); Department of Gastrointestinal Surgery, Jichi Medical University, Shimotsuke, Tochigi (Japan); Inoue, Takeshi [Oncogene Research Unit/Cancer Prevention Unit, Tochigi Cancer Center Research Institute, Utsunomiya, Tochigi (Japan); Miyakura, Yasuyuki; Horie, Hisanaga; Yasuda, Yoshikazu [Department of Gastrointestinal Surgery, Jichi Medical University, Shimotsuke, Tochigi (Japan); Fujii, Hirofumi [Division of Clinical Oncology, Jichi Medical University, Shimotsuke, Tochigi (Japan); Kotake, Kenjiro [Department of Surgery, Tochigi Cancer Center, Utsunomiya, Tochigi (Japan); Sugano, Kokichi, E-mail: ksugano@tcc.pref.tochigi.lg.jp [Oncogene Research Unit/Cancer Prevention Unit, Tochigi Cancer Center Research Institute, Utsunomiya, Tochigi (Japan)

    2013-05-17

    Highlights: •Chemo-sensitivity to SN-38 was assayed by the automated cell counter. •Colon cancer cell line, HCT116 cells were more sensitive to SN-38 than HT29 cells. •Increase of cell size reflects G2/M arrest. •Appearance of small particles indicates cell apoptosis. -- Abstract: In vitro assessment of chemosensitivity are important for experiments evaluating cancer therapies. The Scepter 2.0 cell counter, an automated handheld device based on the Coulter principle of impedance-based particle detection, enables the accurate discrimination of cell populations according to cell size and volume. In this study, the effects of SN-38, the active metabolite of irinotecan, on the colon cancer cell lines HCT116 and HT29 were evaluated using this device. The cell count data obtained with the Scepter counter were compared with those obtained with the {sup 3}H-thymidine uptake assay, which has been used to measure cell proliferation in many previous studies. In addition, we examined whether the changes in the size distributions of these cells reflected alterations in the frequency of cell cycle arrest and/or apoptosis induced by SN-38 treatment. In our experiments using the Scepter 2.0 cell counter, the cell counts were demonstrated to be accurate and reproducible measure and alterations of cell diameter reflected G2/M cell cycle arrest and apoptosis. Our data show that easy-to-use cell counting tools can be utilized to evaluate the cell-killing effects of novel treatments on cancer cells in vitro.

  4. Handheld devices control the variable LED information board remotely with wireless signal%手持设备无线遥控LED可变信息情报板探讨

    Institute of Scientific and Technical Information of China (English)

    龚欢; 赵蕊; 杨东雷; 周跃华

    2014-01-01

    探讨手持设备无线遥控LED可变信息情报板技术,通过使用手机上的蓝牙模块发布、控制工程车后部的LED诱导屏信息变化,采用Java编写应用程序输入手机系统,探讨方案实施的可行性。该远程无线通信遥控方法亦可解决城市公路诱导屏、情报板等控制光缆损坏情况下临时发布信号,信号准确、低功耗、无流量费用,且该技术可设置加密匹配,防止盗用。该方法控制方便,构思新颖,可靠准确,绿色节能,安全可靠。%It’ s the article of exploring the handheld device controlling the variable LED information board remotely with wireless signal. This technology display the information on the upper control truck high-end LED screen change through the use of mobile phones with Bluetooth module,. The controlling application is written by Java which runs on Android system to provide the feasibility of the scheme. This technology can also solve the problem for urban highway guidance screen when its cable is damaged The signal need no flow cost with less mistakes and it’s low power consumption. As well, it needs to be authenticated for pro-tecting used by others. This method is easy to control. The design is novel, reliable, accurate, green, energy saving and security.

  5. 基于iOS手持终端的移动学习资源设计研究%Research on M-learning Resource Design Based on iOS Handheld Device

    Institute of Scientific and Technical Information of China (English)

    李蕾; 李晓丽

    2014-01-01

    移动互联网时代,移动手持设备普及已经相当广泛,设计适合移动学习的资源已经成为移动学习研究的关键问题。该文基于非正式学习与微型学习理论,根据成人移动学习者的特征提出了移动学习资源设计的原则与流程,在此基础上、充分利用iOS的个性化特性设计开发了基于iOS的“地震知识轻松学”移动学习软件,重点介绍了版式与内容分离技术和个性化手势技术的实现。%In Mobile Internet Times, Mobile handheld devices have been widely spread, Design of mobile learning resources have already become the key problem of mobile learning research. In this paper, based on the theory of informal learning and micro learning, according to the characteristics of adult mobile learners, mobile learning resource design principles and process is proposed, and developed a mobile learning software called“earthquake knowledge easy learning”based on the personalized characteristics of iOS technology, Mainly introduces the layout and content separation technology and personalized gesture technology.

  6. Assessment of the exposure of workers to the insecticide imidacloprid during application on various field crops by a hand-held power sprayer.

    Science.gov (United States)

    Choi, Hoon; Moon, Joon-Kwan; Kim, Jeong-Han

    2013-11-13

    Exposure assessment and risk assessment for imidacloprid were conducted for agricultural workers through mixing/loading and application with a power sprayer in four kinds of crop fields. The spray suspension was prepared with 10% wettable powder (250 g) for 5 min and applied on field crops for 1 h. A patch method and a personal air sampler with XAD-2 resin were used to monitor the dermal and inhalation exposure, respectively. In mixing/loading, the total dermal exposure on the whole body was 0.2 (cucumber) to 2.0 (apple) mg and the most exposed part of body was the hand (48-100% of total exposure). During the application of imidacloprid, whole dermal exposure was in the range of 2.9 (apple) to 9.5 (green pepper) mg. The primary sites exposed to pesticides were legs (51-79% of total exposure) in cucumber, green pepper, and paddy fields, whereas the primary sites were hands (35% of total exposure) in the apple field. The inhalation exposure was determined to be 0.2 (paddy) to 2.8 (cucumber) μg and 0.2 (paddy) to 3.0 (cucumber) μg during mixing/loading and application, respectively. The absorbable quantity of exposure and the margin of safety were determined for risk assessment. Workers were exposed through inhalation as 23-93 and 2-11% of the absorbable quantity of exposure during mixing and application, respectively. The margin of safety of all cases was much higher than 1, indicating the lowest possibility of risk. PMID:24111779

  7. Clinical cases

    International Nuclear Information System (INIS)

    This presentation is about clinical cases and the contribution of the PET - CT Fag application in the diagnosis and treatment of different types of cancer. The cases presented were: neck diseases, epidermoid carcinoma, liver damage and metastasize, lymphoma, thrombosis, colonic cancer and lung disease

  8. Case law

    International Nuclear Information System (INIS)

    This section treats of the two following case laws: Slovak Republic: Further developments in cases related to the challenge by Greenpeace Slovakia to the Mochovce nuclear power plant; United States: Judgment of the Nuclear Regulatory Commission denying requests from petitioners to suspend final reactor licensing decisions pending the issuance of a final determination of reasonable assurance of permanent disposal of spent fuel

  9. Case Studies

    International Nuclear Information System (INIS)

    Proven options available to Sri Lanka for large scale electricity generation in the future are coal-fired thermal, oil-fired thermal and Nuclear. Four case studies for groups participated are indicated. Case study for group 1 is comparison of the three options by taking into consideration the capital and recurrent expenditure involved. Environmental effects of the three options are also given. Case study for group 2 is economic comparison of three renewable energy based power generation system. Case study for group 3 is based on energy conservation, efficiency, improvement and demand management. Assuming that a continuous saving of 20 MW of demand from 1996 onwards is effective two projects are suggested to achieve this result. Case study for group 4 is a feasibility study for hydro power development of the Kukule Ganga (river) in Sri Lanka. Participants are required to evaluate one of the three optional development concepts which are technically feasible

  10. Case - Case-Law - Law

    DEFF Research Database (Denmark)

    Sadl, Urska

    2013-01-01

    Reasoning of the Court of Justice of the European Union – Constr uction of arguments in the case-law of the Court – Citation technique – The use of formulas to transform case-law into ‘law’ – ‘Formulaic style’ – European citizenship as a fundamental status – Ruiz Zambrano – Reasoning from...

  11. Mobile Software Testing – Automated Test Case Design Strategies

    Directory of Open Access Journals (Sweden)

    Selvam R,

    2011-04-01

    Full Text Available Mobile devices are poised to challenge PCs as the application platform of choice, with 500 million mobile internet devices expected to ship in 2012 compared to 150 million PCs. The convergence ofall digital devices into mobile platform model augments the software companies, software developer, and venture capitalist firms to turn their focus into mobile application platform (for example mobile social networking application like face book and mobile VOIP like Skype a futuristic platform for increased revenue, new challenges and growth potential. But the commercial success of these applications depends on their working smoothly and securely on a wide variety of handheld devices and wireless networks. More and more virtual mobile application stores are built on the web. The web itself is in the transforming form to adapt to the mobile devices to thrive on. The sudden growth in the mobile application and the complexity in the divergence of the devices that uses these applications present increased challenges and opportunities for the software testing companies and software testers to conquerthis small device. Performing such testing quickly and cost-effectively greatly expands the market for such applications. This paper deals the nuances of Automated Test Case Design Strategies for Mobile Software Testing.

  12. Design of Hand-held Picking Device for Brasenia Schreber Aquatic Plant%水生莼菜植物手动控制采摘器的设计

    Institute of Scientific and Technical Information of China (English)

    夏春风; 马燕平; 沈长生; 张宇

    2014-01-01

    针对水生莼菜植物手工采摘辛苦、效率低下等问题,设计了一种手动控制的莼菜采摘器,分析了其工作原理,给出莼菜切割力计算公式。该采摘器由人手驱动,通过向后逐渐收紧手柄,使与手柄相连的钢丝后移,后移的钢丝再带动直槽形钢片、刀片支架等运动,使主、副刀片闭合,完成莼菜切割运动。然后,操作者将采摘装置移出水面,将切割好的莼菜移到收集装置的网兜上方,松开手柄,主、副刀片自动松开,使莼菜自然落入网兜中。实验表明,该采摘器能达到设计要求,且可靠性高、使用方便、控制灵活,对莼菜和水体均不造成污染。%Am at to solve the problem that brasenia schreberi aquatic plant picked hard and low efficiency by hand , a hand-held picking device for brasenia schreber was designed .Its working principle was introduced , and the calculation formula of brasenia schreberi cutting force was presented .The picking device was driven by hand and by tightening the handle backwards , so that the steel wire connected to the handle moved backward ,the back steel wire drove the piece of straight-shaped steel and the blade holder , closed the main and auxiliary blade and completed cutting brasenia schreberi .Then , the picking device was moved out of the water by the operator , the cut brasenia schreberi was moved to the above net of collecting device ,fell into the net naturally by loosening the handle and releasing the main and auxiliary blade automatically .The picking device of design and manufacture can meet the design requirements through practice test and does not pollute the water and brasenia schreberi .The picking device has the advantages of high reliability , conven-ient to use ,flexible control .

  13. Case law

    International Nuclear Information System (INIS)

    This section gathers the following case laws: 1 - Canada: Judicial review of Darlington new nuclear power plant project; Appeal decision upholding criminal convictions related to attempt to export nuclear-related dual-use items to Iran: Her Majesty the Queen V. Yadegari; 2 - European Commission: Greenland cases; 3 - France: Chernobyl accident - decision of dismissal of the Court of Appeal of Paris; 4 - Slovak Republic: Aarhus Convention compliance update; 5 - United States: Judgement of a US court of appeals upholding the NRC's dismissal of challenges to the renewal of the operating licence for Oyster Creek Nuclear Generating Station; reexamination of the project of high-level waste disposal site at Yucca Mountain

  14. Case work

    DEFF Research Database (Denmark)

    Shaw, Ian Frank

    2016-01-01

    Answers to the question just what is the ?case? partly defined the fields of sociology and social work in early 20th century Chicago. Drawing on the archives of the University of Chicago, I describe and appraise the way the ?case? figured in social work at Chicago and elsewhere. I ask the...... corresponding question of sociology. Finally, I briefly consider why not much came of social work and sociology ploughing similar territory in ways that served for a time to hallmark their identities. This analysis opens up ways of rethinking how social work and sociological research are distinctive to their...

  15. Forest stand spatial structure measurement method using handheld tree measurement smart station%利用手持式超站测树仪测量林分空间结构参数

    Institute of Scientific and Technical Information of China (English)

    冯仲科; 徐伟恒; 杨立岩

    2015-01-01

    Spatial structure is an important characteristic of forest and spatial distribution pattern is one part of researches on population spatial behavior.Based on the relationship of neighborhood trees, three kinds of stand spatial structure parameters including uniform angle index,mingling and dominance was proposed by Professor Gangying Hui. In the past decade, stand spatial structure parameters are widely used to analyze stand spatial structure, calculate trees dominance, judge competition among trees, measure species diversity and recover or reconstruct stand structure at domestic and international study.. Measurement accuracy of spatial structural parameters (uniform angle index, mingling degree, and dominance) has a significant role in studying stand spatial structure. In the traditional direct interpretation method(DIM), it is difficult to measure the angle between reference tree and 4 nearest neighbor trees. For this method, the error derived from tree diameters at breast height is not considered in the process of measurement, so uniform angle index value is inaccurate. Moreover, based on DIM, other two parameters of mingle degree and dominance measurement required at least two operators, one person completed measurement and the other recorded field data, thus it is impossible to calculate the observing results immediately In this paper, a new measuring method named as HSSM was proposed using handheld smart station to measure stand spatial structure parameters in order to enhance measurement precision and accuracy, decrease field investigation workload. For measuring uniform angle index , the angle between reference tree and four nearest neighbor trees is not measured directly. Firstly, X-Y coordinates of reference tree and four nearest neighbor trees are measured using handheld smart station. Secondly, the diameters at breast height of five trees are measured corresponding with each tree, specifically, diameters at breast height measurement is to obtain center

  16. Some fundamentals of handheld snow surface thermography

    Directory of Open Access Journals (Sweden)

    C. Shea

    2010-08-01

    Full Text Available This paper presents the concepts needed to perform snow surface thermography with a modern thermal imager. Snow-specific issues in the 7.5 to 13 μm spectrum such as ice emissivity, photographic angle, operator heating, and others receive detailed review and discussion. To illustrate the usefulness of this measurement technique, various applications are presented. These include detecting spatial temperature variation on snow pit walls and measuring the dependence of heat conduction on grain type.

  17. Some fundamentals of handheld snow surface thermography

    Directory of Open Access Journals (Sweden)

    C. Shea

    2011-02-01

    Full Text Available This paper presents the concepts needed to perform snow surface thermography with a modern thermal imager. Snow-specific issues in the 7.5 to 13 μm spectrum such as ice emissivity, photographic angle, operator heating, and others receive detailed review and discussion. To illustrate the usefulness of this measurement technique, various applications are presented. These include detecting spatial temperature variation on snow pit walls and measuring the dependence of heat conduction on grain type.

  18. Handheld Diagnostic Device Delivers Quick Medical Readings

    Science.gov (United States)

    2014-01-01

    To monitor astronauts' health remotely, Glenn Research Center awarded SBIR funding to Cambridge, Massachusetts-based DNA Medical Institute, which developed a device capable of analyzing blood cell counts and a variety of medical biomarkers. The technology will prove especially useful in rural areas without easy access to labs.

  19. Drawings as Input for Handheld Game Computers

    NARCIS (Netherlands)

    Poel, M.; Zwiers, J.; Nijholt, A.; Jong, de R.; Krooman, E.

    2005-01-01

    The Nintendo DS (TM) is a hand held game computer that includes a small sketch pad as one of it input modalities. We discuss the possibilities for recognition of simple line drawing on this device, with focus of attention on robustness and real-time behavior. The results of our experiments show that

  20. ARTree. Designing & evaluating handheld augmented reality art

    OpenAIRE

    Nordbø, Tone

    2011-01-01

    Augmented reality is a technology combining physical and virtual objects. This study aimes to explore the use of this technology in art. The prototype ARTree was developed through contributions from an artist, and consists of a physical tree and virtual objects representing the four seasons. A qualitative usability test was conducted where ...

  1. Evaluation of uncertainty in handheld terahertz spectroscopy

    Science.gov (United States)

    Dierken, Josiah; Criner, Amanda; Zicht, Tyler

    2016-02-01

    Advances in terahertz spectroscopy have shown it to be an effective tool for the inspection of polymers and ceramics in laboratory environments. Furthermore, recent work has shown promise that terahertz reflectance spectroscopy may be effectively applied to surface characterization of CMCs and PMCs to investigate chemical changes resulting from thermal degradation. However, even under tightly controlled laboratory conditions, various sources of uncertainty such as surface variability, ambient atmospheric conditions, as well as measurement errors within the system will be present. The analysis of measurement uncertainty is further complicated by the fact that reflectance spectra are constituted by the nonlinear relationship between the dielectric spectra and the reflectance spectra, thereby making model calibration more difficult as compared to transmission and absorbance spectroscopy. As inspections transition from laboratory to field-level applications sources of uncertainty must be considered to properly assess the health of a material with any means of statistical significance. In this study, spectra from terahertz spectroscopy systems are investigated to assess the variation in measurement uncertainty. By characterizing the uncertainty variation, recommendations are proposed for improving inspection procedures in both laboratory and field-level NDE.

  2. Case report

    DEFF Research Database (Denmark)

    Füchtbauer, Laila; Brusgaard, Klaus; Ledaal, Pål;

    2015-01-01

    ey Clinical Message Vitamin D-dependent rickets type 1 VDDR-1 is a recessive inherited disorder with impaired activation of vitamin D, caused by mutations in CYP27B1. We present long-time follow-up of a case with a novel mutation including high-resolution peripheral quantitative computed tomography...

  3. Case competitions

    DEFF Research Database (Denmark)

    Schjoldager, Anne Gram

    2009-01-01

    The paper presents and discusses a teaching project with case competitions for MA students of specialised translation at the Aarhus School of Business, Aarhus University. Drawing on a series of online questionnaires, the paper ascertains how the project was evaluated by the participating students...

  4. Cases Description

    DEFF Research Database (Denmark)

    Hansen, Jesper Rohr; Savini, Federico; Wallin, Sirkku;

    2013-01-01

    The JPI Urban Europe research project ‘APRILab’ focuses on planning dilemmas for the transformation of city areas in the urban fringe. In this Working Document we describe the case studies selected by the involved partners: - Aalto University, Finland: T3 in Espoo City - Aalborg University, Denma...

  5. Corruption case.

    Science.gov (United States)

    1999-07-23

    A Federal jury in Puerto Rico found three defendants guilty of participating in the theft of $2.2 million in Federal funds from the San Juan AIDS Institute. The key figure in the case is [name removed], a consultant to the institute. He was convicted of 12 counts of money laundering and faces up to 25 years in prison. Two other administrative officials were also convicted in the case. Four others have pleaded guilty, and three more await trial. Rep. Jose Granados Navado was among those implicated; he received $100,000 for his campaign for mayor of San Juan in 1988 from the institute=s medical director. U.S. Rep. Tom Coburn (R-Okla.) has called for an audit of all Ryan White CARE Act funds since this scandal was uncovered.

  6. Case04

    DEFF Research Database (Denmark)

    Vestergaard, Flemming; Karlshøj, Jan; Hauch, Peter;

    Casestudiets formål er at beskrive og måle en større entreprenørvirksomheds omkostninger og gevin-ster ved at anvende metoder og værktøjer, der er modelbaserede. Case 04 tager udgangspunkt i et konkret byggeprojekt, hvor BIM teknologien er anvendt på et for den danske entreprenørbranche rela...

  7. Case Corabelle

    OpenAIRE

    Hansen, Casper; Henriksen, Jesper; Loznica, Javor; Ragnarsson, Stefan; Hensing, Marcus

    2015-01-01

    This project explores the relation between organizational identity and online brands as formed through interaction and communication on online, social media through a case study of the cancelled music festival event Corabelle that was supposed to have been held in August of 2014. The investigation draws on the theories of Carlos Scolari and David A. Whetten to establish the relation between organizational identity and online brands, and the theories of Henry Jenkins and Jan H. Kietzmann in an...

  8. E-book Trial Using Handheld Devices Yields Mixed Reactions from Public Library Staff and Users in Essex County, UK. A review of: Dearnley, James, Cliff McKnight, and Anne Morris. “Electronic Book Usage in Public Libraries: A Study of User and Staff Reactions to a PDA-based Collection.” Journal of Librarianship and Information Science 36.4 (December 2004: 175‐82.

    Directory of Open Access Journals (Sweden)

    Stephanie Hall

    2006-03-01

    Full Text Available Objective - To assess e-book delivery on handheld devices provided to public library patrons, particularly housebound or visually impaired patrons and the users of a mobile library. Design - Product trial with a post-trial questionnaire for patrons and a post-trial focus group discussion among participating library staff. Setting - Mid-to-large size public library system in the United Kingdom. Subjects - 23 patrons participated; the number of library staff participating is not identified. Although the target population initially identified was housebound people, patrons reliant on the mobile library, and visually impaired people, the project team determined that it did not have sufficient funds to upgrade the PDAs to be compatible woth their preferred software for the visually impaired, and therefore this group was eliminated from the study. Lack of funds was also cited as a factor in the team being unable to provide assistive technology for those users suffering from arthritis, though this group was not excluded from the study. Just over half the patrons were aged 60+, and more than half were female. Two patrons self-identified as housebound. Methods - e-books were downloaded onto Hewlett Packard iPAQ 1910 Pdas by library staff and were loaned to participants between Janualry and April 2004. Although the authors of the study state that "creating staff champions was an important objective in this project" (p.176, it is unclear whether staff were screened for positive attitude towards e-Books. Prior to the trial, staff members were provided with training and orientation, and participants were asked for their font sna d reading preferences. Suport for participating patrons was available from staff or via an accompanying user manual, e-mail, or telephone help line. In a questionnaire adminsitered following the trial, participants were asked to respond to questions on the functionality of the handheld devices and e-book formats, positive and

  9. Bertoko case

    Directory of Open Access Journals (Sweden)

    AMAIA LAFUENTE RUIZ DE SABANDO

    2001-12-01

    Full Text Available Bertoko Gar, S.A. is a minibrewer firm established in 1999. It produces and sells a beer characterized by its local and home-produced character. Despite the fact that no other bottled beer brewers with the same characteristics exist in its home market, Bertoko competes in a market dominated by multinationals. Once it has set its aims, Bertoko is currently designing its marketing strategy and setting which are the actions to be taken for its near future (some of which are detailed in this case.

  10. Case management.

    Science.gov (United States)

    Rosenstein, A H; Propotnik, T

    1997-03-01

    Providing cost-effective high quality healthcare services ranks as the number one concern for anyone involved with the healthcare delivery system. While quality of care should always be the number one priority, controlling healthcare costs receives most of the attention. With limited healthcare dollars and providers assuming more of the financial risk for services rendered, a whole assortment of cost-containment strategies are being introduced in an effort to maintain some semblance of financial viability. Healthcare providers can approach cost control from two different angles. On the fixed-cost operational overhead side, traditional cost-containment techniques have focused on downsizing, maximizing productivity, staffing redesign, improved purchasing contracts, standardization, inventory control, and other more individualized restructured service models. On the variable-cost clinical side, cost control has been approached by introducing a variety of cost-containment strategies designed to improve efficiency and effectiveness of provider performance. While many of these strategies, previously discussed in the Journal of Healthcare Resource Management have stressed the importance of education, guidelines, pathways, and other clinical "tools for improvement," the success of many of these tools resides in the ability to provide real-time intervention. Real-time intervention rather than the more passive retrospective variance analysis has the greatest potential for producing cost savings by actually making a recommendation that prevents the unwanted event from occurring. In many institutions, the case manager bears the responsibility for monitoring and managing these programs. This article describes various case management models currently used by different institutions.

  11. Case Law

    International Nuclear Information System (INIS)

    Different case law are presented in this part: By decision dated 17 july 2009, the Ontario Court of Appeal (Canada) has ruled on the scope of solicitor-client privilege and the protections that may be afforded to privileged investigations reports. The decision reaffirms the canadian court system view of the importance of the protection of solicitor-client privilege to the administration of justice; For United states here is a judgment of a U.S. court of Appeals on the design basis threat security rule (2009), this case concerns a challenge to the U.S. Nuclear regulatory commission (N.R.C.) revised design basis threat rule, which was adopted in 2007 (nuclear bulletin law no. 80). The petitioners public citizen, Inc., San Luis Obispo Mothers for Peace and the State of New York filed a lawsuit in the U.S. court of appeals for the Ninth circuit alleging that the N.R.C. acted arbitrarily and capriciously and in violation of law by refusing to include the treat of air attacks in its final revised design basis rule. On the 24. july 2009, a panel of three ninth circuit judges rules 2-1 that the N.R.C. acted reasonably in not including an air treat in its design basis rule. Secondly, judgment of a U.S. court of appeals on consideration of the environmental impact of terrorist attacks on nuclear facilities (2009), this case concerns the scope of the U.S. Nuclear regulatory commission environmental analysis during its review of applications to re-licence commercial nuclear power plants. New Jersey urged the N.R.C. to consider the environmental impact of an airborne terrorist attack on the power plant, arguing that such analysis was required by the national environmental policy act (N.E.P.A.). On 31. march 2009, a panel of three circuit judges declined to follow the ninth circuit opinion and affirmed NRC decision 3-0 ruling that NRC was not required to consider terrorism in its N.E.P.A. analysis because NRC re-licensing would not be a reasonably close cause of terrorism

  12. Learners’ Perception on Security Issues in M-learning (Nigerian Universities Case Study

    Directory of Open Access Journals (Sweden)

    Shaibu Adekunle Shonola

    2014-10-01

    Full Text Available With the advent of modern technology, mobile phones and smartphones are used not only for calling and text messages but also for banking and social networking. Recent developments in technology have made the use of mobile devices feasible in other sectors such as education and government. While educators are using mobile devices as teaching aids, students are also using them as learning tools.  In some cases the developers of mobile learning in universities are making m-learning apps without serious consideration for security aspects whereas the handheld devices pose a serious threat to confidentiality, integrity and privacy of users including the learners. As a case study, this paper investigates the security concerns that students may have with the introduction of m-learning in higher education institutions in Nigeria and how this impacts on their learning. It examines the effects of security threats in m-learning on students and provides recommendations for alleviating these threats.Photo credit: "Sysop actions of la cabale camembière - croped" by PierreSelim - Own work. Licensed under Creative Commons Attribution 3.0 via Wikimedia Commons - http://commons.wikimedia.org/wiki/File:Sysop_actions_of_la_cabale_camembi%C3%A8re_-_croped.jpg#mediaviewer/

  13. Situated Learning: The case in the city

    OpenAIRE

    Nguyen, Trang Hong Thi

    2006-01-01

    Mobile learning provides many positive effects on learning with handheld devices and applications. Especially educational mobile technologies have been an interesting subject in the learning business, and its purpose is to provide low-cost interactive computers to every student to improve learning. These efforts of mobile technology could help situated learning to be more flexible in the city. Now we have an explosion of mobile devices, and in the future they will create the opportunities fo...

  14. Encouraging Cases

    DEFF Research Database (Denmark)

    Koss Rasmussen, Rasmus

    In CMS, debates on methodology have typically taken second stage to those on epistemology and ontology as the field embraced a plurality of methods. Recent work pushing for CMS to engage more strongly with mainstream theory, however, raises the need for a discussion on how to use methods recogniz......” (Schofield, 2002). In this way, employing case studies in a progressive fashion may serve as a valuable means for a critically perfomative CMS to achieve greater impact through influence on mainstream theory building, business school education and management practice.......In CMS, debates on methodology have typically taken second stage to those on epistemology and ontology as the field embraced a plurality of methods. Recent work pushing for CMS to engage more strongly with mainstream theory, however, raises the need for a discussion on how to use methods...

  15. Case law

    International Nuclear Information System (INIS)

    This section reports on 7 case laws from 4 countries: - France: Conseil d'Etat decision, 28 June 2013, refusing to suspend operation of the Fessenheim nuclear power plant; - Slovak Republic: New developments including the Supreme Court's judgment in a matter involving Greenpeace Slovakia's claims regarding the Mochovce nuclear power plant; New developments in the matter involving Greenpeace's demands for information under the Freedom of Information Act; - Switzerland: Judgment of the Federal Supreme Court in the matter of the Departement federal de l'environnement, des transports, de l'energie et de la communication (DETEC) against Ursula Balmer-Schafroth and others on consideration of admissibility of a request to withdraw the operating licence for the Muehleberg nuclear power plant; - United States: Judgment of the Court of Appeals for the District of Columbia Circuit granting petition for writ of mandamus ordering US Nuclear Regulatory Commission (NRC) to resume Yucca Mountain licensing; Judgment of the Court of Appeals for the Second Circuit invalidating two Vermont statutes as preempted by the Atomic Energy Act; Judgment of the NRC on transferring Shieldalloy site to New Jersey's jurisdiction

  16. Experimental study of the monitoring bias of pressure in intubation balloon using handheld pressure gauge%气囊压力表间断测量气囊压力值偏差的实验研究

    Institute of Scientific and Technical Information of China (English)

    林艳侠; 林丹; 陈碧群; 纪超; 袁从丽; 王宝春

    2014-01-01

    目的 探讨气囊压力表间断测量人工气道气囊压力时,测量值与实际值之间是否存在偏差、偏差来源和偏差大小,为气囊压力表的正确使用提供参考.方法 在实验室体外实验中,采用专用手持气囊压力表通过三通开关与人工气道气囊充气管线单向阀连接,通过三通的开关控制,测量气囊压力,得到测量值偏差后进行临床试验加以验证.研究对象为建立人工气道需行气囊压力监测的成人患者.结果 在实验室经过132次测量发现,手持压力表本身会造成气囊压力下降,称之为固有损失;充气值[(30.000±0.000) cmH2O,1 cmH2O=0.098 kPa]和测量值[(26.072±0.291)cmH2O]之间存在明显偏差,平均为(3.928±0.291)cmH2O(t=155.273,P=0.000);经过214次测量发现,充气管线单向阀在与压力表断开和连接的过程中造成气囊压力下降,称之为误差损失;充气值[(30.000±0.000) cmH2O]和测量值[(28.804±0.954) cmH2O]之间存在偏差,平均为(1.196±0.954) cmH2O(t=18.348,P=0.000).临床经过21 1次验证试验得到固有损失和误差损失两者之和,充气值[(30.000±0.000) cmH2O]和测量值[(24.730±2.583) cmH2O]之间同样存在偏差(即测量偏差),其值为(5.270±2.583) cmH2O(t=29.632,P=0.000).结论 使用气囊压力表进行间断测量气囊压力时,气囊原有的实际压力应为测量值与偏差值之和,且在连接前应先进行声门下吸引,以防止气囊上方分泌物因气囊体积缩小而滑向气道深部而引起误吸,并将气囊压力维持在30 cmH2O.%Objective To explore the bias between the real pressure and the measured values when handheld pressure gauge (HPG) was used to monitor intermittently the pressure in the intubation balloon,so as to provide some measures for the correct use of HPG.Methods In the first part of the study,HPG was used to measure the pressure with the balloon connected with a three-way tube with which to control the inflation and deflation in a

  17. Case law

    International Nuclear Information System (INIS)

    This section treats of the following case laws: 1 - Canada: Decision of the Canadian Federal Court of Appeal overturning a decision to send back for reconsideration an environmental assessment of a proposed new nuclear power plant in Ontario; 2 - France: Council of State decision, 28 November 2014, Federation 'Reseau sortir du nucleaire' (Nuclear Phase-Out network) and others vs. Electricite de France (EDF), Request No. 367013 for the annulment of: - The resolution of the French Nuclear Safety Authority (ASN) dated 4 July 2011 specifying additional regulations for Electricite de France (EDF) designed to strengthen the reactor basemat of reactor No. 1 in the Fessenheim nuclear power plant, and - The resolution of ASN dated 19 December 2012 approving the start of work on reinforcing the reactor basemat in accordance with the dossier submitted by EDF; 3 - Germany: Judgment of the European Court of Justice on the nuclear fuel tax; 4 - India: Judgment of the High Court of Kerala in a public interest litigation challenging the constitutional validity of the Civil Liability for Nuclear Damage Act, 2010; 5 - Japan - District court decisions on lawsuits related to the restart of Sendai NPP and Takahama NPP; 6 - Poland: Decision of the Masovian Voivod concerning the legality of the resolution on holding a local referendum in the Commune of Rozan regarding a new radioactive waste repository; Certain provisions of the Regulation of the Minister of Health of 18 February 2011 on the conditions for safe use of ionising radiation for all types of medical exposure have been declared unconstitutional by a judgment pronounced by the Constitutional Tribunal; 7 - Slovak Republic: Developments in relation to the disclosure of information concerning the Mochovce nuclear power plant

  18. Case Study: Writing a Journal Case Study

    Science.gov (United States)

    Prud'homme-Genereux, Annie

    2016-01-01

    This column provides original articles on innovations in case study teaching, assessment of the method, as well as case studies with teaching notes. This month's issue describes incorporating a journal article into the classroom by first converting it into a case study.

  19. Clinical Case Registries (CCR)

    Data.gov (United States)

    Department of Veterans Affairs — The Clinical Case Registries (CCR) replaced the former Immunology Case Registry and the Hepatitis C Case Registry with local and national databases. The CCR:HIV and...

  20. CASING DRILLING TECHNOLOGY

    Directory of Open Access Journals (Sweden)

    Nediljka Gaurina-Međimurec

    2005-12-01

    Full Text Available Casing drilling is an alternative option to conventional drilling and uses standard oilfield casing instead of drillstring. This technology is one of the greatest developments in drilling operations. Casing drilling involves drilling and casing a well simultaneously. In casing driling process, downhole tools can be retrieved, through the casing on wire-line, meaning tool recovery or replacement of tools can take minutes versus hours under conventional methods. This process employs wireline-retrievable tools and a drill-lock assembly, permitting bit and BHA changes, coring, electrical logging and even directional or horizontal drilling. Once the casing point is reached, the casing is cemented in place without tripping pipe.

  1. Project management case studies

    CERN Document Server

    Kerzner, Harold R

    2013-01-01

    A new edition of the most popular book of project management case studies, expanded to include more than 100 cases plus a ""super case"" on the Iridium Project Case studies are an important part of project management education and training. This Fourth Edition of Harold Kerzner''s Project Management Case Studies features a number of new cases covering value measurement in project management. Also included is the well-received ""super case,"" which covers all aspects of project management and may be used as a capstone for a course. This new edition:Contains 100-plus case studies drawn from re

  2. PSS Case Book

    DEFF Research Database (Denmark)

    Neugebauer, Line Maria; Mougaard, Krestine; Andersen, Jakob Bejbro;

    The transformation process towards a PSS-oriented company is describes, through the presentation of the best practice cases. Each case describes motivations, challenges, business models and PSS offerings.......The transformation process towards a PSS-oriented company is describes, through the presentation of the best practice cases. Each case describes motivations, challenges, business models and PSS offerings....

  3. Case Based Reasoning: Case Representation Methodologies

    Directory of Open Access Journals (Sweden)

    Shaker H. El-Sappagh

    2015-11-01

    Full Text Available Case Based Reasoning (CBR is an important technique in artificial intelligence, which has been applied to various kinds of problems in a wide range of domains. Selecting case representation formalism is critical for the proper operation of the overall CBR system. In this paper, we survey and evaluate all of the existing case representation methodologies. Moreover, the case retrieval and future challenges for effective CBR are explained. Case representation methods are grouped in to knowledge-intensive approaches and traditional approaches. The first group overweight the second one. The first methods depend on ontology and enhance all CBR processes including case representation, retrieval, storage, and adaptation. By using a proposed set of qualitative metrics, the existing methods based on ontology for case representation are studied and evaluated in details. All these systems have limitations. No approach exceeds 53% of the specified metrics. The results of the survey explain the current limitations of CBR systems. It shows that ontology usage in case representation needs improvements to achieve semantic representation and semantic retrieval in CBR system.

  4. Improving hand sensibility in vibration induced neuropathy: A case-series

    Directory of Open Access Journals (Sweden)

    Lundborg Göran

    2011-04-01

    Full Text Available Abstract Objectives We report a long-term series of nine workers suffering from vibration-induced neuropathy, after many years of exposure to hand-held vibrating tools at high or low frequency. They were treated with temporary selective cutaneous anaesthesia (EMLA® cream of the forearm repeatedly for a period up to one year (in two cases four years. The aim was to improve their capacity to perceive touch and thereby improve hand function and diminish disability. The treatment principle is based on current concepts of brain plasticity, where a deafferentation of a skin area results in improved sensory function in adjacent skin areas. Methods All participants had sensory hand problems in terms of numbness (median touch thresholds > 70 mg and impaired hand function influencing ADL (mean DASH score 22. After an initial identical self-administered treatment period of 8 weeks (12-15 treatments with increasing intervals they did one treatment every 2-3 month. Results After one year sensibility (touch thresholds and tactile discrimination as well as hand function (mean DASH score 13 were improved in a majority of the cases. Seven of the participants choose to continue the treatment after the first year and two of them have continued at a regular basis for up to four years. A surprising, secondary finding was diminishing nocturnal numbness of the hand and arm in eight of the nine subjects from "frequently" to "hardly ever or never". Conclusions Our observations open new perspectives for treatment of impaired sensibility and hand function in a group of patients with vibration induced hand problems where we have no treatment to offer today.

  5. Comparative Test Case Specification

    DEFF Research Database (Denmark)

    Kalyanova, Olena; Heiselberg, Per

     This document includes a definition of the comparative test cases DSF200_3 and DSF200_4, which previously described in the comparative test case specification for the test cases DSF100_3 and DSF200_3 [Ref.1]....... This document includes a definition of the comparative test cases DSF200_3 and DSF200_4, which previously described in the comparative test case specification for the test cases DSF100_3 and DSF200_3 [Ref.1]....

  6. Effect of Latent Myofascial Trigger Points on Strength Measurements of the Upper Trapezius: A Case-Controlled Trial

    Science.gov (United States)

    Anshul

    2011-01-01

    ABSTRACT Purpose: The purpose of this article was to determine whether strength is altered in the upper trapezius in the presence of latent myofascial trigger points (MTrP). Methods: This study was case controlled and used convenience sampling. The sample recruited was homogeneous with respect to age, sex, height, and body mass. Participants were assessed for the presence of latent MTrP in the upper trapezius and placed into two groups: an experimental group that had latent MTrP in the upper trapezius and a control group that did not. Eighteen women (mean age 21.4 y, SD 1.89; mean height 156.9 cm, SD 4.03; and mean body mass 51.7 kg, SD 5.84) made up the experimental group, and 19 women (mean age 20.3 y, SD 1.86; mean height 158.6 cm, SD 3.14; and mean body mass 53.2 kg, SD 5.17) made up the control group. We obtained strength measurements of the non-dominant arm using a handheld dynamometer and compared them between the two groups. Results: The difference in the strength measurements between the two groups was not statistically significant (p=0.59). Conclusions: The presence of latent MTrPs may not affect the strength of the upper trapezius. PMID:22942517

  7. Using a Bedside Video-assisted Test Tube Test to Assess Stoma Viability: A Report of 4 Cases.

    Science.gov (United States)

    Ahmad, Sarwat; Turner, Keli; Shah, Paulesh; Diaz, Jose

    2016-07-01

    Mucosal discoloration of an intestinal stoma may indicate self-limited venous congestion or necrosis necessitating operative revision. A common bedside technique to assess stoma viability is the "test tube test". A clear tube is inserted into the stoma and a hand-held light is used to assess the color of the stoma. A technique (video-assisted test tube test [VATTT]) developed by the authors utilizes a standard video bronchoscope inserted into a clear plastic blood collection tube to visually inspect and assess the mucosa. This technique was evaluated in 4 patients (age range 49-72 years, all critically ill) with a discolored stoma after emergency surgery. In each case, physical exam revealed ischemic mucosa at the surface either immediately after surgery or after worsening hypotension weeks later. Serial test tube test assessments were ambiguous when trying to assess deeper mucosa. The VATTT assessment showed viable pink mucosa beneath the surface and until the fascia was revealed in 3 patients. One (1) patient had mucosal ischemia down to the fascia, which prompted operative revision of the stoma. The new stoma was assessed with a VATTT and was viable for the entire length of the stoma. VATTT provided an enhanced, magnified, and clearer way to visually assess stoma viability in the postoperative period that can be performed at the bedside with no adverse events. It may prevent unnecessary relaparotomy or enable earlier diagnosis of deep ostomy necrosis. Validity and reliability studies are warranted. PMID:27428565

  8. Xeroderma pigmentosum (case report

    Directory of Open Access Journals (Sweden)

    Dubey Arvind

    1990-01-01

    Full Text Available Xeroderma pigmentosum is a rare, hereditary and fatal disease of the skin. Ocular involvement is known to occur in 80% of cases. A case with typical cutaneous and ocular lesions is reported.

  9. Disaster Case Management

    Data.gov (United States)

    U.S. Department of Health & Human Services — The Disaster Case Management Program (DCM) is a time-limited process that involves a partnership between a case manager and a disaster survivor (also known as a...

  10. FHEO Filed Cases

    Data.gov (United States)

    Department of Housing and Urban Development — The dataset is a list of all the Title VIII fair housing cases filed by FHEO from 1/1/2007 - 12/31/2012 including the case number, case name, filing date, state and...

  11. Discussion on the Improvement of Security Functions of Railway Communication by the Hand-held Mobile Monitoring Positioning Terminal%手持移动监控定位终端改进铁路通信安全功能探讨

    Institute of Scientific and Technical Information of China (English)

    杨青

    2015-01-01

    Through analyzing the existing problems of the monitoring and command of the original railway communication work, this paper expounds the functions of hand-held mobile monitoring positioning terminal to show that the application of monitor terminal system in railway communication system plays an important role in improving the emergency rescue of railway communication and the control of construction work and protecting the operation security of railway communication. The application of terminal greatly improves the working accuracy, shortens the time of failure treatment, reduces the economic losses caused by the faults and greatly improves the efficiency of railway communication. It is helpful to achieve the goal of value management.%本文通过分析原有铁路通信作业监控指挥存在的问题,阐述手持移动监控定位终端的功能,进而说明在铁路通信系统中应用监控终端系统,在改进铁路通信应急抢险和施工作业把控及铁路通信作业安全保障方面发挥的重要作用。终端的使用大大提高了作业精度,缩短了处理故障的时间,降低了故障造成的经济损失,从而大大提高铁路通信的效率,有助于实现价值管理的目标。

  12. Defining a periodontitis case

    DEFF Research Database (Denmark)

    Baelum, Vibeke; Lopez, Rodrigo

    2012-01-01

    Aim The purpose of the present study was to assess the extent to which the three periodontitis case definition systems proposed by van der Velden, Tonetti & Claffey and Page & Eke identify the same cases in a population of never-treated adults with limited tradition for oral hygiene procedures...... of the concomitant presence of CAL and BOP at the site level. Results The case definitions by Tonetti & Claffey and by Page & Eke yielded similar results, which were also quite similar to the results of simply identifying a case of periodontitis as a person having at least one site showing both CAL ≥ 4 mm and BOP....... Conclusions The results indicate that it should be feasible for the periodontal community to reach an agreement over the distinction between a case and a non-case. The classification system proposed by van der Velden is better suited for providing clinicians with a clear image of the case....

  13. Diffuse Optical Characterization of the Healthy Human Thyroid Tissue and Two Pathological Case Studies.

    Directory of Open Access Journals (Sweden)

    Claus Lindner

    Full Text Available The in vivo optical and hemodynamic properties of the healthy (n = 22 and pathological (n = 2 human thyroid tissue were measured non-invasively using a custom time-resolved spectroscopy (TRS and diffuse correlation spectroscopy (DCS system. Medical ultrasound was used to guide the placement of the hand-held hybrid optical probe. TRS measured the absorption and reduced scattering coefficients (μa, μs' at three wavelengths (690, 785 and 830 nm to derive total hemoglobin concentration (THC and oxygen saturation (StO2. DCS measured the microvascular blood flow index (BFI. Their dependencies on physiological and clinical parameters and positions along the thyroid were investigated and compared to the surrounding sternocleidomastoid muscle. The THC in the thyroid ranged from 131.9 μM to 144.8 μM, showing a 25-44% increase compared to the surrounding sternocleidomastoid muscle tissue. The blood flow was significantly higher in the thyroid (BFIthyroid = 16.0 × 10-9 cm2/s compared to the muscle (BFImuscle = 7.8 × 10-9 cm2/s, while StO2 showed a small (StO2, muscle = 63.8% to StO2, thyroid = 68.4%, yet significant difference. Two case studies with thyroid nodules underwent the same measurement protocol prior to thyroidectomy. Their THC and BFI reached values around 226.5 μM and 62.8 × 10-9 cm2/s respectively showing a clear contrast to the nodule-free thyroid tissue as well as the general population. The initial characterization of the healthy and pathologic human thyroid tissue lays the ground work for the future investigation on the use of diffuse optics in thyroid cancer screening.

  14. Diffuse Optical Characterization of the Healthy Human Thyroid Tissue and Two Pathological Case Studies.

    Science.gov (United States)

    Lindner, Claus; Mora, Mireia; Farzam, Parisa; Squarcia, Mattia; Johansson, Johannes; Weigel, Udo M; Halperin, Irene; Hanzu, Felicia A; Durduran, Turgut

    2016-01-01

    The in vivo optical and hemodynamic properties of the healthy (n = 22) and pathological (n = 2) human thyroid tissue were measured non-invasively using a custom time-resolved spectroscopy (TRS) and diffuse correlation spectroscopy (DCS) system. Medical ultrasound was used to guide the placement of the hand-held hybrid optical probe. TRS measured the absorption and reduced scattering coefficients (μa, μs') at three wavelengths (690, 785 and 830 nm) to derive total hemoglobin concentration (THC) and oxygen saturation (StO2). DCS measured the microvascular blood flow index (BFI). Their dependencies on physiological and clinical parameters and positions along the thyroid were investigated and compared to the surrounding sternocleidomastoid muscle. The THC in the thyroid ranged from 131.9 μM to 144.8 μM, showing a 25-44% increase compared to the surrounding sternocleidomastoid muscle tissue. The blood flow was significantly higher in the thyroid (BFIthyroid = 16.0 × 10-9 cm2/s) compared to the muscle (BFImuscle = 7.8 × 10-9 cm2/s), while StO2 showed a small (StO2, muscle = 63.8% to StO2, thyroid = 68.4%), yet significant difference. Two case studies with thyroid nodules underwent the same measurement protocol prior to thyroidectomy. Their THC and BFI reached values around 226.5 μM and 62.8 × 10-9 cm2/s respectively showing a clear contrast to the nodule-free thyroid tissue as well as the general population. The initial characterization of the healthy and pathologic human thyroid tissue lays the ground work for the future investigation on the use of diffuse optics in thyroid cancer screening. PMID:26815533

  15. Osteopoikilosis - Case report

    Directory of Open Access Journals (Sweden)

    Vilson Ruci

    2014-03-01

    Full Text Available Osteopoikilosis is a rare bone anomaly usually benign which may be confused with other severe primary diseases or dangerous metastatic bone lesions. We present one new case describing typical radiological findings with no clinical signs or other associations. No malignant transformation or other complications happened in the last ten years. Osteopoikilosis is found in most cases incidentally, and in most cases is not associated with other serious medical complications. Screening of family members may be considered.

  16. Borderline Cases and Definiteness

    OpenAIRE

    Vecsey, Zoltán

    2012-01-01

    Borderline cases of vague predicates are often characterized with the help of a definiteness operator. Although such operators can certainly contribute to the solution of the problem of vagueness, they may also generate unexpected consequences. Either borderlineness is identified implicitly with a well-defined range of cases, or borderline cases are seen as being definitely borderline. In this paper I argue that we can avoid these consequences by providing an asymmetric definition of borderli...

  17. From Use Cases to Activity Cases

    DEFF Research Database (Denmark)

    Bækgaard, Lars

    2005-01-01

    Use cases can be used to capture requirements and to subdivide IT-systems into functionally coherent units. Information systems are activity systems that carry out important business activities. Many systems development methods recognize activity modeling as an important development activity. Use...

  18. Case-based reasoning

    CERN Document Server

    Kolodner, Janet

    1993-01-01

    Case-based reasoning is one of the fastest growing areas in the field of knowledge-based systems and this book, authored by a leader in the field, is the first comprehensive text on the subject. Case-based reasoning systems are systems that store information about situations in their memory. As new problems arise, similar situations are searched out to help solve these problems. Problems are understood and inferences are made by finding the closest cases in memory, comparing and contrasting the problem with those cases, making inferences based on those comparisons, and asking questions whe

  19. A Case of Hyperlexis?

    Science.gov (United States)

    Zirkel, Perry A.

    2000-01-01

    In a protracted case involving a varsity basketball coach's refusal to select a problem parent's son, the Fourth Circuit Court of Appeals decided the suit was frivolous and ordered the parent to pay $2,500 in court fees. This case illustrates the intersection of three American excesses--litigiousness, athletics, and divorce. (MLH)

  20. Essential trichomegaly: case report

    Directory of Open Access Journals (Sweden)

    Julia Dutra Rossetto

    2013-02-01

    Full Text Available The present study reports two cases of symptomatic essential trichomegaly. Trichomegaly may develop in various diseases, including anorexia nervosa, hypothyroidism, pregnancy, pretibial myxedema, systemic lupus erythematosus, vernal keratoconjunctivitis, and uveitis. The exact incidence trichomegaly is unknown, and the condition remains sporadically reported. Two cases of symptomatic trichomegaly without any associated systemic disorder are presented in this paper.

  1. Examples and Case Studies

    NARCIS (Netherlands)

    Asbach, C.; Aguerre, O.; Bressot, C.; Brouwer, D.H.; Gommel, U.; Gorbunov, B.; Bihan, O. le; Jensen, K.A.; Kaminski, H.; Keller, M.; Koponen, I.K.; Kuhlbusch, T.A.J.; Lecloux, A.; Morgeneyer, M.; Muir, R.; Shandilya, N.; Stahlmecke, B.; Todea, A.M.

    2014-01-01

    Release of nanomaterials may occur during any stage of the life-cycle and can eventually lead to exposure to humans, the environment or products. Due to the large number of combinations of release processes and nanomaterials, release scenarios can currently only be tested on a case-by-case basis. Th

  2. Centralizer for well casing

    International Nuclear Information System (INIS)

    This patent describes an improved centralizer for centering a well casing in a wellbore. It comprises: a first anchor adapted to fit around and be securely fixed to the casing, the first anchor being threaded on its external surface; a first collar adapted to fit around and be threadedly engaged by the first anchor; a second collar adapted to fit around and free to rotate and move axially with respect to the casing; a second anchor adapted to fit around and be securely fixed to the casing spaced from the first anchor and comprising a bearing surface for restraining axial movement of the second collar along the casing; and metallic straps extending between the first collar and the second collar, and being securely fixed to each

  3. [Autoptically confirmed malpractice cases].

    Science.gov (United States)

    Madea, Burkhard

    2008-01-01

    Claims of lethal medical malpractice cases in penal law are mostly dealt with by experts in forensic medicine since in lethal cases the autopsy is crucial for determining the cause of death. Knowledge of the cause of death, in turn, is the necessary basis of an expert opinion on negligence and the causality between negligence and cause of death. Compared to civil lawsuits filed for malpractice and cases dealt with at the arbitration committees of the medical councils penal lawsuits with 1500 to 2000 cases per year are of minor importance. Our own retrospective multicentre study on lawsuits filed for lethal cases of medical malpractice (based on autopsy findings of 4450 cases) revealed an annual increase in autopsies due to medical negligence from 3 to 6 hundred. Hospital doctors are more frequently affected by medical malpractice claims than private-practice physicians. However, the rate of confirmed medical malpractice cases is much higher for doctors in private practice. Although surgeons are most frequently charged with medical malpractice the rate of confirmed medical malpractice cases is comparatively low in surgery. Medico-legal autopsies in cases of alleged medical malpractice are often ordered by the public prosecutor because the manner of death was classified as unnatural or undetermined. Therefore the often-heard reproach that doctors frequently make mistakes and do their very best to hide them is not true. Thus, it has to be recommended that in a case of unexpected death associated with medical treatment the doctor in his own interest should classify the manner of death as undetermined. PMID:19213446

  4. Some of the cases

    DEFF Research Database (Denmark)

    Eller, Nanna Hurwitz; Mogensen, Jørn Thykjær; Gyntelberg, Finn

    2014-01-01

    matched on age and gender. The cases had experienced significantly fewer incidents of violence and had less anxiety and flashback symptoms than the controls. The results suggest that the negative press coverage was the reason for the psychiatric symptoms rather than exposures at the workplace.......Some of the cases of acknowledged occupational psychiatric disorder in Denmark have been exposed to negative press coverage. Such individuals might have been exposed to violence to a lower extent than other with an acknowledged psychological work injury. We compared 25 cases with 35 controls...

  5. USCIS My Case Status

    Data.gov (United States)

    Department of Homeland Security — USCIS provide a way for the public who applied for U.S. citizenship to check the status of their application online. To view the status of a case, the application...

  6. Case File: The Spazzoids

    Science.gov (United States)

    ... classroom activities. More Related Links Healthy Schools Case file: The Spazzzoids Recommend on Facebook Tweet Share Compartir ... your classroom activities. More Related Links Healthy Schools File Formats Help: How do I view different file ...

  7. Neurilemoma. A case report.

    Science.gov (United States)

    Caporusso, J; Cook, M; Bullard, B P; Harkless, L B

    1994-10-01

    In this article, a case report of a patient presenting with "burning pain in the ball of her right foot" is detailed. Topics discussed include the diagnosis, surgical excision, and histopathology. PMID:7812908

  8. Safety case plan 2008

    International Nuclear Information System (INIS)

    Following the guidelines set forth by the Ministry of Trade and Industry (now Ministry of Employment and Economy) Posiva is preparing to submit the construction license application for a spent fuel repository by the end of the year 2012. The long-term safety section supporting the license application is based on a safety case, which, according to the internationally adopted definition, is a compilation of the evidence, analyses and arguments that quantify and substantiate the safety and the level of expert confidence in the safety of the planned repository. In 2005, Posiva presented a plan to prepare such a safety case. The present report provides a revised plan of the safety case contents mentioned above. The update of the safety case plan takes into account the recommendations made by the Radiation and Nuclear Safety Authority (STUK) about improving the focus and further developing the plan. Accordingly, particular attention is given to the quality management of the safety case work, the management of uncertainties and the scenario methodology. The quality management is based on the ISO 9001:2000 standard process thinking enhanced with special features arising from STUK's YVL Guides. The safety case production process is divided into four main sub-processes. The conceptualisation and methodology sub-process defines the framework for the assessment. The critical data handling and modelling sub-process links Posiva's main technical and scientific activities to the production of the safety case. The assessment sub-process analyses the consequences of the evolution of the disposal system in various scenarios, classified either as part of the expected evolution or as disruptive scenarios. The compliance and confidence sub-process is responsible for final evaluation of compliance of the assessment results with the regulatory criteria and the overall confidence in the safety case. As in the previous safety case plan, the safety case will be based on several reports, but

  9. Comparative Test Case Specification

    DEFF Research Database (Denmark)

    Kalyanova, Olena; Heiselberg, Per

    This document includes the specification on the IEA task of evaluation building energy simulation computer programs for the Double Skin Facades (DSF) constructions. There are two approaches involved into this procedure, one is the comparative approach and another is the empirical one. In the comp....... In the comparative approach the outcomes of different software tools are compared, while in the empirical approach the modelling results are compared with the results of experimental test cases. The comparative test cases include: ventilation, shading and geometry....

  10. Leakage behind casing

    OpenAIRE

    Khandka, Rupak Kumar

    2007-01-01

    Achieving zonal isolation by cementing annulus space between casing and well bore is an important job in many oil wells. Gas leakage in the annulus has been recognised as a major completion problem in the oil well. A successful cement job results in complete zonal isolation on a permanent basis. To achieve these goals, various factors such as well security, casing centralization, effective mud removal, and gas migration must be considered in the design. The design of the cement must be such t...

  11. ACROMEGALY: A CASE REPORT

    OpenAIRE

    -()

    2015-01-01

    Acromegaly is a rare disease caused due to hyper secretion of growth hormone. Most of the cases of acromegaly are caused by pitutary adenoma which can be microadenoma or macroadenomas. These adenomas are never malignant, but can have significant morbidity and mortality. We report a 35 year old female patient presented herewith classical presentation of acromegaly with chief complain of weight gain, excessive sweating , widening of both hands and feet and was diagnosed as a case of acromega...

  12. Autoerotic deaths: four cases.

    Science.gov (United States)

    Cooke, C T; Cadden, G A; Margolius, K A

    1994-07-01

    We describe the circumstances and post mortem medical findings of 4 unusual fatalities where death occurred during autoerotic practice. Three cases occurred in young to middle-aged men--hanging, electrocution and inhalation of a zucchini. The manner of death in each was accidental. The fourth case was an elderly man who died of ischemic heart disease, apparently whilst masturbating with a vacuum cleaner and a hair dryer.

  13. Pseudocide: A Case Report.

    Science.gov (United States)

    Coffey, M Justin; Ahmedani, Brian K

    2016-07-01

    The authors describe a case of "pseudocide" in which the patient appears to have feigned his own suicide. This case was identified as a result of a routine reconciliation of internally collected suicide data with government-collected mortality data. The authors discuss the evolution of the concept of pseudocide in the clinical literature and consider issues related to deceitful and factitious behaviors and suicide surveillance and measurement. PMID:27427845

  14. Radiological case: congenital scoliosis

    OpenAIRE

    Macedo, F.

    2010-01-01

    ABSTRACT We present a case of a two month old infant with clinical suspicion of congenital torticollis because of lateral flexion of the head and neck since birth. There was no response to physiotherapy and the neck ultrasound was normal. An x-ray of the cervical and dorsal spine showed congenital scoliosis with failure of formation in certain vertebras. The diagnosis of congenital scoliosis must be considered in cases of abnormal tilting of the head and neck.

  15. Oral Myiasis : Case Report

    OpenAIRE

    Ramli, Roszalina; Abd Rahman, Roslan

    2002-01-01

    Myiasis occurs when living tissues of mammals are invaded by eggs or larvae of flies, mainly from the order of Diptera. Most of the previousty reported cases are in the tropics and they were usually associated with inadequate personal hygiene, sometimes with poor manual dexterity. This report describes two cases of oral myiasis in cerebral palsy patients in Seremban General Hospital, Malaysia. This article also discusses the therapeutic property of maggots and highlights the importance of ora...

  16. The case for Dounreay

    International Nuclear Information System (INIS)

    This document sets out to state the case for the Commercial Demonstration Fast Reactor and to explain the reasons why it should be situated at Dounreay, Caithness, Scotland. Headings are: the case for CDFR; why should the CDFR be sited in Caithness (Caithness before Dounreay; the social and economic significance of Dounreay; the Caithness economy today; Caithness - the need for jobs); the CDFR and Caithness; conclusions. (U.K.)

  17. Worst case selection

    International Nuclear Information System (INIS)

    For large safety related DOE facilities, re-evaluation of features to ensure the mitigation of natural phenomena hazards can be costly and require long schedules to implement. This is especially true for features which are numerous and diverse such as building steel structures, concrete structures, masonry/tile walls, tanks, equipment and their anchorages, penetrations to containment vessels, steel platforms, embedded plates, conduit, conduit supports, cable tray, cable tray supports, HVAC ductwork, duct supports, piping and pipe supports. To reduce the cost and time required for re-evaluation, worst cases can be selected from populations of civil features with similar attributes based on drawing reviews, field investigations and review of any available existing calculations. If worst cases then qualify by evaluation or testing, it is reasonable to accept an entire population of features as justified. In addition, when modifications are required for worst cases, further investigation to assess the remaining non-worst case population for the presence of critical attributes, and conditions that contribute to the need for modification of worst cases, can be performed. However to ensure valid results, the methodology and process must be systematic, logical, based on applicable design criteria, traceable, independently verifiable, and reproducible. This paper will offer approaches developed from experiences implementing worst case qualification programs for the upgrade of existing facilities

  18. A High-precision Hand-held Face Detection System

    Directory of Open Access Journals (Sweden)

    Chenghao Jiang

    2013-06-01

    Full Text Available This paper aims at portable high-precision surface defect detection equipment designed based on laser non-contact measurement, though a CCD camera and dual word line semiconductor lasers can achieve the measurement of small surface in a close distance. Resultant data is sent to PC via wireless transmission mode to achieve the separation of detection module with terminal display processing module. The detection system with a small-volume structure which can achieve fast and accurate scanning can be used to achieve the device workpiece surface defect measurement under various complex occasions. It is able to achieve real-time display of the measurement results through MATLAB graphical user interface. High measuring accuracy and reliability of the system is verified by experiments, and the depth measurement accuracy can reach 40μm. The results provide an important basis for the detection of surface blemish and improve product design and processing quality.

  19. Handheld System Energy Reduction by OS-Driven Refresh

    OpenAIRE

    Moshnyaga, Vasily G.; Hoa Vo; Reinman, Glenn; Potkonjak, Miodrag

    2006-01-01

    Emerging portable devices relay on DRAM/flash memory system to satisfy requirements on fast and large data storage and low-energy consumption. This paper presents a novel approach to reduce energy of memory system, which unlike others, lowers energy of refresh operation in DRAM. The approach is based on two key ideas: (1) DRAM-based flash cache that keeps dirty pages to reduce the number of accesses to flash memory; and (2) OS-controlled page allocation/aging to stop the refresh operations in...

  20. Hand-held high resolution gamma ray spectrometer

    International Nuclear Information System (INIS)

    A fully portable and a semi-portable high resolution gamma spectrometer are described. These instruments have the resolving capabilities that are inherent to germanium spectrometers and have the portability needed for health physics. The instruments are usable as a gamma-ray or x-ray fluorescence spectrometer