Sample records for rapidly varying mobile

  1. RAPID COMMUNICATION Yolk Testosterone Varies With Sex in

    E-print Network

    Wade, Juli

    RAPID COMMUNICATION Yolk Testosterone Varies With Sex in Eggs of the Lizard, Anolis carolinensis), a lizard with genotypic sex determination, yolk testosterone (T) concentration is greater in male previous studies. If yolk T levels are also sex-specific before eggs are laid, a period during which

  2. Local non-Gaussianity from rapidly varying sound speeds

    E-print Network

    Jon Emery; Gianmassimo Tasinato; David Wands

    2012-07-16

    We study the effect of non-trivial sound speeds on local-type non-Gaussianity during multiple-field inflation. To this end, we consider a model of multiple-field DBI and use the deltaN formalism to track the super-horizon evolution of perturbations. By adopting a sum separable Hubble parameter we derive analytic expressions for the relevant quantities in the two-field case, valid beyond slow variation. We find that non-trivial sound speeds can, in principle, curve the trajectory in such a way that significant local-type non-Gaussianity is produced. Deviations from slow variation, such as rapidly varying sound speeds, enhance this effect. To illustrate our results we consider two-field inflation in the tip regions of two warped throats and find large local-type non-Gaussianity produced towards the end of the inflationary process.

  3. Time varying channel modeling for ad-hoc mobile wireless networks

    Microsoft Academic Search

    M. M. Olama; S. M. Djouadi; C. D. Charalambous

    2006-01-01

    Due to node mobility and environmental changes in mobile ad-hoc networks, the ad-hoc channel is time varying and subject to fading. As a consequence of these variations, the statistical characteristics of the received signal vary continuously, giving rise to a Doppler power spectral density (DPSD) which varies from one observation instant to the next. As a result, the traditional models

  4. RAPID ADAPTATION FOR MOBILE SPEECH APPLICATIONS Michiel Bacchiani

    E-print Network

    Cortes, Corinna

    RAPID ADAPTATION FOR MOBILE SPEECH APPLICATIONS Michiel Bacchiani Google Inc., New York, NY 10011 michiel@google.com ABSTRACT We investigate the use of iVector-based rapid adaptation for recog- nition. Index Terms-- iVectors, rapid adaptation, Eigenvoices, GMM 1. INTRODUCTION Acoustic model adaptation has

  5. Rapid behavioral response to corticosterone varies with photoperiod and dose.

    PubMed

    Breuner, C W; Wingfield, J C

    2000-02-01

    The magnitude of the adrenocortical response to stress can be modulated by a variety of environmental and physiological factors, such as daylength and body condition. To determine the consequences of this modulation for the organism, one also needs to investigate behavioral sensitivity to glucocorticoids. We examined the behavioral response of Gambel's white-crowned sparrows (Zonotrichia leucophrys gambelii) to elevated glucocorticoids. Using a behavioral assay in which a rapid and transient dose of corticosterone (CORT: the avian glucocorticoid) rapidly increases perch hopping, we first investigated the photoperiodic regulation of this behavioral response. Intermediate levels of CORT ( approximately 24 ng/ml), which increased activity in sparrows exposed to a long-day (breeding) photoperiod, had no behavioral effect in sparrows exposed to a short-day (winter) photoperiod. Hence, the neural mechanisms which regulate the behavioral response to CORT appear to be less sensitive under a winter photoperiod. Using the same behavioral assay, we also measured a dose-response curve for CORT's effects on activity in sparrows exposed to the long-day photoperiod. Intermediate levels (24 and 40 ng/ml) increased activity to threefold background levels, whereas high physiological levels (65 and 97 ng/ml) had no effect. Given that the behavioral response does not increase linearly with CORT, we can no longer assume that modulation of the adrenocortical response to stress will result in linear changes in behavior. PMID:10712855

  6. Thumb motor performance varies with thumb and wrist posture during single-handed mobile phone use

    E-print Network

    Jindrich, Devin L.

    Tapping a b s t r a c t Design features of mobile computing technology such as device size and key. & 2012 Elsevier Ltd. All rights reserved. 1. Introduction Given the mobile nature of smartphones, usersThumb motor performance varies with thumb and wrist posture during single-handed mobile phone use

  7. Volterra integral equations with rapidly varying kernels and their asymptotic integration

    SciTech Connect

    Bobodzhanov, A A; Safonov, V F [Moscow Power Engineering Institute, Moscow (Russian Federation)

    2001-08-31

    This paper is concerned with a singularly perturbed integral system with rapidly varying kernels. In contrast to integral equations with slowly varying kernels, where regularization is carried out with respect to the spectrum of the 'diagonal' kernel, the regularization problem in the case of rapidly varying kernels is solved in terms of the spectrum of a certain extended operator. The goal here is to construct this operator and develop an appropriate algorithm for asymptotic solutions.

  8. Takagi-Sugeno model synthesis of a quasi-linear parameter varying mobile robot

    Microsoft Academic Search

    J. T. Economou; A. Tsourdos; B. A. White

    2002-01-01

    This paper presents the application of the Takagi-Sugeno (TS) model synthesis for a quasi-linear parameter varying (QLPV) four wheel differentially steered mobile robot. The focus of this paper is a mathematical description of the mobile robot model as a QLPV and application of the TS fuzzy logic framework which complements the QLPV approach. Using QLPV model data several local TS

  9. Stability and Control of Mobile Communications Systems With Time Varying Channels

    E-print Network

    Stability and Control of Mobile Communications Systems With Time Varying Channels Robert Buche, 2001 Abstract Consider the forward link of a mobile communications system with a single transmitter to the destination until transmitted. The main issues are the allocation of transmitter power and time to the various

  10. Stability and Control of Mobile Communications Systems With Time Varying Channels

    E-print Network

    Stability and Control of Mobile Communications Systems With Time Varying Channels Robert Buche Abstract Consider the forward link of a mobile communications system with a single transmitter and rather transmitted. The main issues are the allocation of transmitter power and time to the various queues in a queue

  11. Abstract--The rapidly growing bandwidth demand for mobile internet and mobile broadband applications is currently trigger-

    E-print Network

    Paris-Sud XI, Université de

    Abstract--The rapidly growing bandwidth demand for mobile internet and mobile broadband of major concern, especially if it comes to the huge success of current and future mobile internet in urban areas. At the same time, most us- ers today use their "mobile internet" mostly within their homes

  12. Transient effective hydraulic conductivities under slowly and rapidly varying mean gradients in bounded three-

    E-print Network

    Tartakovsky, Daniel M.

    Transient effective hydraulic conductivities under slowly and rapidly varying mean gradients it Darcian in real or transformed domains. Each such situation gives rise to an effective hydraulic-time. In this paper we develop first-order analytical expressions for effective hydraulic conductivity under three

  13. Axial invariance of rapidly varying di usionless motions in the Earth's core interior

    E-print Network

    Recanati, Catherine

    Axial invariance of rapidly varying di#27;usionless motions in the Earth's core interior Dominique years, numerical simulations of the dynamo process in the Earth's core have much changed the views by a magnetic #28;eld among the transient motions set up by an impulsive rotation of the inner core

  14. Tracking of Time-varying Mobile Radio Channels Part II: A Case Study

    E-print Network

    Tracking of Time-varying Mobile Radio Channels Part II: A Case Study Lars Lindbom, Anders Ahl#19;en, Sweden. Anders Ahl#19;en and Mikael Sternad are with Signals and Systems, Uppsala Uni- versity, PO Box 528, SE-75120, Uppsala, Sweden. Phone +46 4713076, fax +46 18 555096, aa@signal.uu.se, ms

  15. Time-varying Feedback Stabilization of Car-like Wheeled Mobile Robots

    Microsoft Academic Search

    Claude Samson

    1993-01-01

    Many nonholonomic mechanical systems, such as common wheeled mobile robots, are controllable but cannot be stabilized to given positions and orientations bv using smooth pure-state feedback control. However, as shown in Samson (1990), such systems may still be stabilized by using smooth time-varying feedbacks,—i.e., feedbacks that explicitly depend on the time variable. This possibility is here applied to the stabilization

  16. Rapid Generation of Realistic Mobility Models for VANET

    Microsoft Academic Search

    Feliz Kristianto Karnadi; Zhi Hai Mo; Kun-chan Lan

    2007-01-01

    One emerging, new type of ad-hoc network is the vehicular ad-hoc network (VANET), in which vehicles constitute the mobile nodes in the network. Due to the prohibitive cost of deploying and implementing such a system in real world, most research in VANET relies on simulations for evaluation. A key component for VANET simulations is a realistic vehicular mobility model that

  17. Rapid Mobility via Type Indirection Ben Y. Zhao, Ling Huang, Anthony D. Joseph, and John Kubiatowicz

    E-print Network

    Zhao, Ben Y.

    .g., hotel, coffee shop, etc.) and mobile (e.g., train, subway, etc.) environments [1]. We consider two rapid). Handled naively, the delay in processing handoffs will be exacerbated by the large volume of users moving

  18. An automated sampling system using ion mobility spectrometry for the rapid detection of bacteria

    Microsoft Academic Search

    N. J. C. Strachan; F. J. Nicholson; I. D. Ogden

    1995-01-01

    An ion mobility spectrometer coupled to an automated sampling system for rapid detection of bacteria is described. Examples are given of its applications to detect different species of bacteria of food safety concern. The method is based on the recognition of a volatile, metabolised enzymatically from a biochemical substrate, and detected by the ion mobility spectrometer.

  19. Integrating rapid risk mapping and mobile phone call record data for strategic malaria elimination planning

    PubMed Central

    2014-01-01

    Background As successful malaria control programmes re-orientate towards elimination, the identification of transmission foci, targeting of attack measures to high-risk areas and management of importation risk become high priorities. When resources are limited and transmission is varying seasonally, approaches that can rapidly prioritize areas for surveillance and control can be valuable, and the most appropriate attack measure for a particular location is likely to differ depending on whether it exports or imports malaria infections. Methods/Results Here, using the example of Namibia, a method for targeting of interventions using surveillance data, satellite imagery, and mobile phone call records to support elimination planning is described. One year of aggregated movement patterns for over a million people across Namibia are analyzed, and linked with case-based risk maps built on satellite imagery. By combining case-data and movement, the way human population movements connect transmission risk areas is demonstrated. Communities that were strongly connected by relatively higher levels of movement were then identified, and net export and import of travellers and infection risks by region were quantified. These maps can aid the design of targeted interventions to maximally reduce the number of cases exported to other regions while employing appropriate interventions to manage risk in places that import them. Conclusions The approaches presented can be rapidly updated and used to identify where active surveillance for both local and imported cases should be increased, which regions would benefit from coordinating efforts, and how spatially progressive elimination plans can be designed. With improvements in surveillance systems linked to improved diagnosis of malaria, detailed satellite imagery being readily available and mobile phone usage data continually being collected by network providers, the potential exists to make operational use of such valuable, complimentary and contemporary datasets on an ongoing basis in infectious disease control and elimination. PMID:24512144

  20. The development of a mobile humanoid robot with varying joint stiffness waist

    Microsoft Academic Search

    Zhao Tiejun; Tan Dalong; Zhao Mingyang

    2005-01-01

    A mobile humanoid robot named YIREN has been developed as a platform for the research on intelligent robotics. The robot consists of 23 degrees of freedom (DOF), including the mobile platform, waist, torso, arms, neck and head, and it has two peculiarities: a waist mechanism that could adjust the mechanical compliance suitably and a mobile platform which is an omni-directional

  1. Use of approximate mobility index to identify areas susceptible to landsliding by rapid mobilization to debris flows in southern Thailand

    NASA Astrophysics Data System (ADS)

    Harper, Stephen B.

    A major rainstorm in November 1988 triggered extensice landsliding by debris flow in the Nakhon Si Thammarat Range of southern Thailand. To provide a background to understand the distribution and causes of this landsliding, an overview of the physical and climatic setting, the geologic and geomorphic setting, and the weathered soil and colluvial material of this area are presented. Additionally, the previous work on landsliding in southern Thailand and the characteristics of and possible mechanisms for mobilization of debris flows are reviewed. Application of the approximate mobility index (AMI) to weathered soils collected from one area of the Nakhon Si Thammarat Range, which experienced extensive damage by debris flow in November 1988, suggests that the initial rotational and planar slides in this area were mobilized by liquefaction into rapidly moving debris flows. Furthermore, both the range of AMI values obtained and air photo and field observations suggest that the approximate mobility index might prove to be a useful measure to delineate areas in which surficially weathered material is most susceptible to landsliding by rapid mobilization into debris flows.

  2. Rapid data analysis method for differential mobility cytometry.

    PubMed

    Reif, Randall D; Wang, Kelong; Pappas, Dimitri

    2009-12-01

    Differential mobility cytometry (DMC) has recently been established as a powerful method to capture cells and study adhesion processes. DMC uses an oscillation system and cell affinity chromatography to monitor cells as they adhere to a surface. In the past, differential images had to be created individually which limited the throughput of the method. A new method to create differential images is presented. The method involves the subtraction of short movies from each other to create a stack of differential images that can be easily analyzed. In the future, this method will make DMC more accessible and improve throughput. PMID:19813006

  3. Formylpeptide Receptors Mediate Rapid Neutrophil Mobilization to Accelerate Wound Healing

    PubMed Central

    Liu, Mingyong; Chen, Keqiang; Yoshimura, Teizo; Liu, Ying; Gong, Wanghua; Le, Yingying; Gao, Ji-Liang; Zhao, Jianhua; Wang, Ji Ming; Wang, Aimin

    2014-01-01

    Wound healing is a multi-phased pathophysiological process requiring chemoattractant receptor-dependent accumulation of myeloid cells in the lesion. Two G protein-coupled formylpeptide receptors Fpr1 and Fpr2 mediate rapid neutrophil infiltration in the liver of Listeria-infected mice by sensing pathogen-derived chemotactic ligands. These receptors also recognize host-derived chemotactic peptides in inflammation and injury. Here we report the capacity of Fprs to promote the healing of sterile skin wound in mice by initiating neutrophil infiltration. We found that in normal miceneutrophils rapidly infiltrated the dermis in the wound before the production of neutrophil-specific chemokines by the injured tissue. In contrast, rapid neutrophil infiltration was markedly reduced with delayed wound closure in mice deficient in both Fprs. In addition, we detected Fpr ligand activity that chemoattracted neutrophils into the wound tissue. Our study thus demonstrates that Fprs are critical for normal healing of the sterile skin wound by mediating the first wave of neutrophil infiltration. PMID:24603667

  4. Simulation of rapid startup in microwave magnetrons with azimuthally-varying axial magnetic fields

    Microsoft Academic Search

    M. C. Jones; V. B. Neculaes; W. White; Y. Y. Lau; R. M. Gilgenbach; J. Luginsland; P. Pengvanich; N. M. Jordan; Y. Hidaka; H. Bosman

    2004-01-01

    Recent experiments have shown that the sidebands and the close-in noise in a microwave oven magnetron may be virtually eliminated by the addition of an azimuthally varying axial magnetic field. Not only the low noise behavior was observed, but also the startup was found to be substantially hastened when the number of the perturbing magnets equals the number of electron

  5. Rapid Assessment of Contrast Sensitivity with Mobile Touch-screens

    NASA Technical Reports Server (NTRS)

    Mulligan, Jeffrey B.

    2013-01-01

    The availability of low-cost high-quality touch-screen displays in modern mobile devices has created opportunities for new approaches to routine visual measurements. Here we describe a novel method in which subjects use a finger swipe to indicate the transition from visible to invisible on a grating which is swept in both contrast and frequency. Because a single image can be swiped in about a second, it is practical to use a series of images to zoom in on particular ranges of contrast or frequency, both to increase the accuracy of the measurements and to obtain an estimate of the reliability of the subject. Sensitivities to chromatic and spatio-temporal modulations are easily measured using the same method. We will demonstrate a prototype for Apple Computer's iPad-iPod-iPhone family of devices, implemented using an open-source scripting environment known as QuIP (QUick Image Processing,

  6. The effect of rapidly varying contact stress fields on fretting fatigue

    Microsoft Academic Search

    J. A Araújo; D Nowell

    2002-01-01

    An experimental and analytical study of the effect of varying contact stress fields on the initiation life of fretted specimens is conducted for two high strength alloys commonly used in the aerospace industry, namely Al4%Cu and Ti-6Al-4V. The experiments reveal there is a contact size effect in fretting fatigue life. Two critical plane models are used to predict the observed

  7. Vascular trauma induces rapid but transient mobilization of VEGFR2(+)AC133(+) endothelial precursor cells.

    PubMed

    Gill, M; Dias, S; Hattori, K; Rivera, M L; Hicklin, D; Witte, L; Girardi, L; Yurt, R; Himel, H; Rafii, S

    2001-02-01

    Bone marrow (BM)-derived circulating endothelial precursor cells (CEPs) are thought to play a role in postnatal angiogenesis. Emerging evidence suggests that angiogenic stress of vascular trauma may induce mobilization of CEPs to the peripheral circulation. In this regard, we studied the kinetics of CEP mobilization in two groups of patients who experienced acute vascular insult secondary to burns or coronary artery bypass grafting (CABG). In both burn and CABG patients, there was a consistent, rapid increase in the number of CEPs, determined by their surface expression pattern of vascular endothelial growth factor receptor 2 (VEGFR2), vascular endothelial cadherin (VE-cadherin), and AC133. Within the first 6 to 12 hours after injury, the percentage of CEPs in the peripheral blood of burn or CABG patients increased almost 50-fold, returning to basal levels within 48 to 72 hours. Mobilized cells also formed late-outgrowth endothelial colonies (CFU-ECs) in culture, indicating that a small, but significant, number of circulating endothelial cells were BM-derived CEPs. In parallel to the mobilization of CEPs, there was also a rapid elevation of VEGF plasma levels. Maximum VEGF levels were detected within 6 to 12 hours of vascular trauma and decreased to baseline levels after 48 to 72 hours. Acute elevation of VEGF in the mice plasma resulted in a similar kinetics of mobilization of VEGFR2(+) cells. On the basis of these results, we propose that vascular trauma may induce release of chemokines, such as VEGF, that promotes rapid mobilization of CEPs to the peripheral circulation. Strategies to improve the mobilization and incorporation of CEPs may contribute to the acceleration of vascularization of the injured vascular tissue. PMID:11157668

  8. ESI/Ion Trap/Ion Mobility/Time-of-Flight Mass Spectrometry for Rapid and Sensitive Analysis of

    E-print Network

    Clemmer, David E.

    ESI/Ion Trap/Ion Mobility/Time-of-Flight Mass Spectrometry for Rapid and Sensitive Analysis* Department of Chemistry, Indiana University, Bloomington, Indiana 47405 An ion trap/ion mobility of the mixture are separated based on dif- ferences in mobility through a buffer gas. Ions that exit the drift

  9. Fast-responder: Rapid mobile-phone access to recent remote sensing imagery for first responders

    NASA Astrophysics Data System (ADS)

    Talbot, L. M.; Talbot, B. G.

    We introduce Fast-Responder, a novel prototype data-dissemination application and architecture concept to rapidly deliver remote sensing imagery to smartphones to enable situational awareness. The architecture implements a Fast-Earth image caching system on the phone and interacts with a Fast-Earth server. Prototype evaluation successfully demonstrated that National Guard users could select a location, download multiple remote sensing images, and flicker between images, all in less than a minute on a 3G mobile commercial link. The Fast-Responder architecture is a significant advance that is designed to meet the needs of mobile users, such as National Guard response units, to rapidly access information during a crisis, such as a natural or man-made disaster. This paper focuses on the architecture design and advanced user interface concepts for small-screens for highly active mobile users. Novel Fast-Responder concepts can also enable rapid dissemination and evaluation of imagery on the desktop, opening new technology horizons for both desktop and mobile users.

  10. Application of ion mobility spectrometry to the rapid screening of methamphetamine incorporated in hair

    Microsoft Academic Search

    Akihiro Miki; Thomas Keller; Priska Regenscheit; Richard Dirnhofer; Michiaki Tatsuno; Munehiro Katagi; Mayumi Nishikawa; Hitoshi Tsuchihashi

    1997-01-01

    Using ion mobility spectrometry (IMS), a simple, sensitive and rapid screening for methamphetamine (MA) incorporated in user's hair has been developed. To completely unbind MA from hair matrix and to achieve its effective vaporization for the IMS detection, the hair sample was digested in 5 M NaOH (methanol-water, 4:1, v\\/v) solution prior to IMS measurement. MA in hair was semi-quantitatively

  11. Rapid Mobilization of Membrane Lipids in Wheat Leaf-Sheaths during Incompatible Interactions with Hessian Fly*

    PubMed Central

    Zhu, Lieceng; Liu, Xuming; Wang, Haiyan; Khajuria, Chitvan; Reese, John C.; Whitworth, R. Jeff; Welti, Ruth; Chen, Ming-Shun

    2013-01-01

    Hessian fly (HF) is a biotrophic insect that interacts with wheat on a gene-for-gene basis. We profiled changes in membrane lipids in two isogenic wheat lines: a susceptible line and its backcrossed offspring containing the resistance gene H13. Our results revealed a 32 to 45% reduction in total concentrations of 129 lipid species in resistant plants during incompatible interactions within 24 h after HF attack. A smaller and delayed response was observed in susceptible plants during compatible interactions. Microarray and real-time PCR analyses of 168 lipid-metabolism related transcripts revealed that the abundance of many of these transcripts increased rapidly in resistant plants after HF attack, but did not change in susceptible plants. In association with the rapid mobilization of membrane lipids, the concentrations of some fatty acids and 12-oxo-phytodienoic acid (OPDA) increased specifically in resistant plants. Exogenous application of OPDA increased mortality of HF larvae significantly. Collectively, our data, along with previously published results, indicate that the lipids were mobilized through lipolysis, producing free fatty acids, which were likely further converted into oxylipins and other defense molecules. Our results suggest that rapid mobilization of membrane lipids constitutes an important step for wheat to defend against HF attack. PMID:22668001

  12. Mobile Robot Positioning with 433-MHz Wireless Motes with Varying Transmission Powers and a Particle Filter

    PubMed Central

    Canedo-Rodriguez, Adrian; Rodriguez, Jose Manuel; Alvarez-Santos, Victor; Iglesias, Roberto; Regueiro, Carlos V.

    2015-01-01

    In wireless positioning systems, the transmitter's power is usually fixed. In this paper, we explore the use of varying transmission powers to increase the performance of a wireless localization system. To this extent, we have designed a robot positioning system based on wireless motes. Our motes use an inexpensive, low-power sub-1-GHz system-on-chip (CC1110) working in the 433-MHz ISM band. Our localization algorithm is based on a particle filter and infers the robot position by: (1) comparing the power received with the expected one; and (2) integrating the robot displacement. We demonstrate that the use of transmitters that vary their transmission power over time improves the performance of the wireless positioning system significantly, with respect to a system that uses fixed power transmitters. This opens the door for applications where the robot can localize itself actively by requesting the transmitters to change their power in real time. PMID:25942641

  13. Ion mobility spectrometry for the rapid analysis of over-the-counter drugs and beverages.

    PubMed

    Fernández-Maestre, Roberto; Hill, Herbert H

    2009-08-01

    In the pharmaceutical industry, there are increasing requirements for analytical methods in quality assessment for the production of drugs. In this investigation, ion mobility spectrometry (IMS) was used for the rapid qualitative separation and identification of active ingredients in generic over-the-counter drugs and food additives in beverages. The active ingredients determined in drugs were acetaminophen, aspartame, bisacodyl, caffeine, dextromethorphan, diphenhydramine, famotidine, glucosamine, guaifenesin, loratadine, niacin, phenylephrine, pyridoxine, thiamin, and tetrahydrozoline. Aspartame and caffeine were determined in beverages. Fourteen over-the-counter drugs and beverages were analyzed. Analysis times below 10 s were obtained for IMS, and reduced mobilities were reported for the first time for 12 compounds. A quadrupole mass spectrometer coupled to a mobility spectrometer was used to assure a correct peak assignation. The combination of fast analysis, low cost, and inexpensive maintenance of IMS instruments makes IMS an attractive technique for the qualitative determination of the active ingredients in over-the-counter drugs and food additives in manufacture quality control and cleaning verification for the drug and food industries. PMID:20835390

  14. A rapid analytical method for hair analysis using ambient pressure ion mobility mass spectrometry with electrospray ionization (ESI-IMMS)

    Microsoft Academic Search

    Prabha Dwivedi; Herbert H. Hill Jr

    2008-01-01

    Analysis of hair is often applied to assess drug abuse history, exposure to environmental and industrial pollutants, heavy\\u000a metals, gestational drug exposure and various other screening purposes. This manuscript reports the application of ambient\\u000a pressure ion mobility spectrometry mass spectrometry (IMMS) with electrospray ionization (ESI) source as a rapid analytical\\u000a tool for hair analysis. The study demonstrated that ion mobility

  15. Kinetic behaviour in supercritical fluid chromatography with modified mobile phase for 5 ?m particle size and varied flow rates.

    PubMed

    Lesellier, E; Fougere, L; Poe, Donald P

    2011-04-15

    After much development of stationary phase chemistry, in recent years the focus of many studies in HPLC has shifted to increase the efficiency and analysis speed. Ultra high pressure liquid chromatography (UHPLC) using sub-2 ?m particles, and high temperature liquid chromatography (HTLC), using temperatures above 100°C have received much attention. These new approaches allow the use of flow rates higher than those classically used in HPLC, reducing the analysis duration. Due to the low viscosity of supercritical fluids, high velocities, i.e. high flow rates, can be achieved with classical pumping systems typically used in supercritical fluid chromatography (SFC). The effects of the flow rate increase with CO(2)/methanol mobile phase was studied on the inlet pressure, t(0), the retention factor of the compounds, and on the efficiency. Simple comparisons of efficiencies obtained at varied temperature between SFC and HPLC, with a packed column containing 5 ?m particles, show the greater kinetic performances achieved with the CO(2)/methanol fluid, and underline specific behaviours of SFC, occurring for high flow rates and sub-ambient temperature. Some values (N/t(0)) are also compared to UHPLC data, showing that good performance can be achieved in SFC without applying drastic analytical conditions. Finally, simple kinetic plots (t(0) vs N) at constant column length are used to select combinations of temperature and flow rate necessary to achieve a required theoretical plate number. PMID:21232748

  16. Boron activation and diffusion in silicon for varying initial process conditions during flash-assist rapid thermal annealing

    Microsoft Academic Search

    Renata A. Camillo-Castillo

    2006-01-01

    Flash-assist Rapid Thermal Processing offers thermal budgets more than three orders of magnitude less than conventional annealing technologies. It therefore presents an opportunity for the continued scaling of complementary metal-oxide-semiconductor (CMOS) technologies, which demand highly doped, ultra shallow junctions for its source\\/drain extensions. These low thermal budgets are expected to limit dopant diffusion, while the extremely rapid ramp rates enable

  17. Rapid Changes in Mobile Computing Environment: An Overview of Security, Privacy and Social Issues of Mobile in Wireless Market

    Microsoft Academic Search

    K. Asha

    The use of mobile devices embedded in the surrounding physical environment, users can be provided with transparent computing and communication services at all times and in all places. The complexity of providing such services stems from the fact that the communication devices and the objects with which they interact may both be mobile. Their implementation requires advances in wireless network

  18. Urban mobility in the developing world

    Microsoft Academic Search

    Ralph Gakenheimer

    1999-01-01

    Mobility and accessibility are declining rapidly in most of the developing world. The issues that affect levels of mobility and possibilities for its improvement are varied. They include the rapid pace of motorization, conditions of local demand that far exceed the capacity of facilities, the incompatibility of urban structure with increased motorization, a stronger transport–land use relationship than in developed

  19. P. W. Guilbert, A. C. Fabian and Susan Stepney. Electron-ion coupling in rapidly varying sources. Monthly Notices of the Royal Astronomical Society, 199:19P-21P, 1982.

    E-print Network

    Stepney, Susan

    P. W. Guilbert, A. C. Fabian and Susan Stepney. Electron-ion coupling in rapidly varying sources. Monthly Notices of the Royal Astronomical Society, 199:19P-21P, 1982. Electron-ion coupling in rapidly varying sources P. W. Guilbert JILA, Boulder, Colorado. A. C. Fabian and Susan Stepney Institute

  20. Rapid analysis of lubricants by atmospheric solid analysis probe-ion mobility mass spectrometry.

    PubMed

    Barrère, Caroline; Hubert-Roux, Marie; Afonso, Carlos; Racaud, Amandine

    2014-08-01

    Formulated lubricants are complex mixtures composed of base oil(s) and additives with various functions (detergents, corrosion inhibiter, antioxidant, viscosity modifiers, etc.). Because of the aliphatic nature of base oil and the chemical diversity of additives, the characterization of lubricant is currently a long and complex process. The comprehensive analysis of lubricant samples involves several techniques such as nuclear magnetic resonance, mass spectrometry, chromatography and infrared spectroscopy. The coupling of atmospheric solid analysis probe (ASAP) with ion mobility-mass spectrometry (IM-MS) has been shown to be an efficient tool for the characterization of complex mixture containing vaporizable polar to non-polar compounds. This approach affords the coupling of a direct ionization technique that does not require sample preparation, with a bi-dimensional separation method with high peak capacity. In this work, we show that ASAP-IM-MS is a suitable method for rapid and direct characterization of lubricant samples. Indeed, base oil and additives yielded, by ASAP, ions series which could be separated by IM-MS. Molecular additives such as Zn-dithiocarbamate, phosphite, thiophosphate and Alkyl diphenylamine were ionized as molecular ions [M](+•) or protonated molecules [M?+?H](+), depending of their polarity. In some cases, fragment ions were observed, confirming the additive identification. In addition, high molecular weight polymeric additives such as poly(alkyl methacrylate) (PAM) were pyrolized in the ASAP source leading to characteristic fragment ions. ASAP-IM-MS is shown to be a powerful tool for studying complex mixtures, allowing the first comprehensive analysis of lubricants in just a few minutes. PMID:25044898

  1. Sliding Mode Control of a Mobile Robot for Dynamic Obstacle Avoidance Based on a Time-Varying Harmonic Potential Field

    Microsoft Academic Search

    Antonella Ferrara

    2007-01-01

    In this paper, a harmonic potential field method for dynamic environments is proposed to generate an on-line reference trajectory for a wheeled mobile robot. A sliding mode controller is used to make the robot move along the prescribed trajectory determined by the gradient lines. The potential field is modified on-line, in order to make the robot avoid the collision with

  2. Barriers to Health Care in Rural Mozambique: A Rapid Ethnographic Assessment of Planned Mobile Health Clinics for ART

    PubMed Central

    Schwitters, Amee; Lederer, Philip; Zilversmit, Leah; Gudo, Paula Samo; Ramiro, Isaias; Cumba, Luisa; Mahagaja, Epifanio; Jobarteh, Kebba

    2015-01-01

    ABSTRACT Background: In Mozambique, 1.6 million people are living with HIV, and over 60% of the population lives in rural areas lacking access to health services. Mobile health clinics, implemented in 2013 in 2 provinces, are beginning to offer antiretroviral therapy (ART) and basic primary care services. Prior to introduction of the mobile health clinics in the communities, we performed a rapid ethnographic assessment to understand barriers to accessing HIV care and treatment services and acceptability and potential use of the mobile health clinics as an alternative means of service delivery. Methods: We conducted assessments in Gaza province in January 2013 and in Zambezia Province in April–May 2013 in districts where mobile health clinic implementation was planned. Community leaders served as key informants, and chain-referral sampling was used to recruit participants. Interviews were conducted with community leaders, health care providers, traditional healers, national health system patients, and traditional healer patients. Interviewees were asked about barriers to health services and about mobile health clinic acceptance. Results: In-depth interviews were conducted with 117 participants (Gaza province, n?=?57; Zambezia Province, n?=?60). Barriers to accessing health services included transportation and distance-related issues (reliability, cost, and travel time). Participants reported concurrent use of traditional and national health systems. The decision to use a particular health system depended on illness type, service distance, and lack of confidence in the national health system. Overall, participants were receptive to using mobile health clinics for their health care and ability to increase access to ART. Hesitations concerning mobile health clinics included potentially long wait times due to high patient loads. Participants emphasized the importance of regular and published visit schedules and inclusion of community members in planning mobile health clinic services. Conclusion: Mobile health clinics can address many barriers to uptake of HIV services, particularly related to transportation issues. Involvement of community leaders, providers, traditional healers, and patients, as well as regularly scheduled mobile clinic visits, are critical to successful service delivery implementation in rural areas. PMID:25745124

  3. Rapid multivariate curve resolution applied to identification of explosives by ion mobility spectrometry

    Microsoft Academic Search

    Tricia L. Buxton; Peter de B. Harrington

    2001-01-01

    Ion mobility spectrometers (IMS) are routinely used by airport personnel to screen for explosive residues on luggage, and law enforcement officials use ion mobility spectrometers to screen samples at crime scenes for drugs of abuse. IMS has several advantages when screening which include high sensitivity, low detection limits, and short analysis times. The Barringer Ionscan® 350, coupled to LabVIEW™ for

  4. Vascular Trauma Induces Rapid but Transient Mobilization of VEGFR21AC1331 Endothelial Precursor Cells

    Microsoft Academic Search

    Muhammad Gill; Sergio Dias; Koichi Hattori; Mary Lee Rivera; Daniel Hicklin; Larry Witte; Leonard Girardi; Roger Yurt; Harvey Himel; Shahin Rafii

    2010-01-01

    Bone marrow (BM)- derived circulating endothelial precursor cells (CEPs) are thought to play a role in postnatal angiogenesis. Emerging evidence suggests that angiogenic stress of vascular trauma may induce mobilization of CEPs to the peripheral circulation. In this regard, we studied the kinetics of CEP mobilization in two groups of patients who experienced acute vascular insult secondary to burns or

  5. Amarino: a toolkit for the rapid prototyping of mobile ubiquitous computing

    Microsoft Academic Search

    Bonifaz Kaufmann; Leah Buechley

    2010-01-01

    Ubicomp applications increasingly involve smart phones that control or communicate with embedded systems. Compelling examples in this space include tangible interfaces, environmental sensor networks, game controllers and automated homes. Across research, design, and hobbyist communities there is clearly a desire to build applications that involve combinations of mobile and non-mobile technologies. However, constructing these applications is a laborious process that

  6. Development of rapid methodologies for the isolation and quantitation of drug metabolites by differential mobility spectrometry – mass spectrometry

    PubMed Central

    Coy, Stephen L.; Nazarov, Erkinjon; Vouros, Paul

    2013-01-01

    Clinical and forensic toxicology laboratories are inundated with thousands of samples requiring lengthy chromatographic separations prior to mass spectrometry. Here, we employ differential mobility spectrometry (DMS) interfaced to nano-electrospray ionization-mass spectrometry to provide a rapid ion filtration technique for the separation of ions in gas phase media prior to mass spectral analysis on a DMS-integrated AB SCIEX API 3000 triple-quadrupole mass spectrometer. DMS is efficient at the rapid separation of ions under ambient conditions and provides many advantages when used as an ion filtration technique in tandem with mass spectrometry (MS) and MS/MS. Our studies evaluated DMS-MS/MS as a rapid, quantitative platform for the analysis of drug metabolites isolated from urine samples. In targeted applications, five metabolites of common drugs of abuse were effectively and rapidly separated using isopropanol and ethyl acetate as transport gas modifiers, eliminating the gas chromatography or liquid chromatography-based separations commonly employed in clinical and forensic toxicology laboratories. Calibration curves were prepared for the selected drug metabolites utilizing deuterated internal standards for quantitative purposes. The feasibility of separating and quantitating drug metabolites in a rapid fashion was evaluated by compensation voltage stepping followed by multiple reaction monitoring (MRM) detection. Rapid profiling of clinical and forensic toxicology samples could help to address an urgent need within the scientific community by developing high-throughput analytical methodologies, which could reduce significant case backlogs present within these laboratories. PMID:24311968

  7. Rapidly growing tropical trees mobilize remarkable amounts of nitrogen, in ways that differ surprisingly among species.

    PubMed

    Russell, Ann E; Raich, James W

    2012-06-26

    Fast-growing forests such as tropical secondary forests can accumulate large amounts of carbon (C), and thereby play an important role in the atmospheric CO(2) balance. Because nitrogen (N) cycling is inextricably linked with C cycling, the question becomes: Where does the N come from to match high rates of C accumulation? In unique experimental 16-y-old plantations established in abandoned pasture in lowland Costa Rica, we used a mass-balance approach to quantify N accumulation in vegetation, identify sources of N, and evaluate differences among tree species in N cycling. The replicated design contained four broad-leaved evergreen tree species growing under similar environmental conditions. Nitrogen uptake was rapid, reaching 409 (± 30) kg · ha(-1) · y(-1), double the rate reported from a Puerto Rican forest and greater than four times that observed at Hubbard Brook Forest (New Hampshire, USA). Nitrogen amassed in vegetation was 874 (± 176) kg · ha(-1), whereas net losses of soil N (0-100 cm) varied from 217 (±146) to 3,354 (± 915) kg · ha(-1) (P = 0.018) over 16 y. Soil C:N, ?(13)C values, and N budgets indicated that soil was the main source of biomass N. In Vochysia guatemalensis, however, N fixation contributed >60 kg · ha(-1) · y(-1). All species apparently promoted soil N turnover, such that the soil N mean residence time was 32-54 y, an order of magnitude lower than the global mean. High rates of N uptake were associated with substantial N losses in three of the species, in which an average of 1.6 g N was lost for every gram of N accumulated in biomass. PMID:22689942

  8. Rapid Turnover of Stereocilia Membrane Proteins: Evidence from the Trafficking and Mobility of Plasma Membrane Ca2+-ATPase 2

    PubMed Central

    Grati, M'hamed; Schneider, Mark E.; Lipkow, Karen; Strehler, Emanuel E.; Wenthold, Robert J.; Kachar, Bechara

    2007-01-01

    We studied the spatial distribution, mobility, and trafficking of plasma membrane Ca2+ATPase-2 (PMCA2), a protein enriched in the hair cell apical membrane and essential for hair cell function. Using immunofluorescence, we determined that PMCA2 is enriched in the stereocilia and present at a relatively low concentration in the kinocilium and in the remaining apical membrane. Using an antibody to the extracellular domain of PMCA2 as a probe, we observed that PMCA2 diffuses laterally from the stereocilia membrane and is internalized at the apical cell border maintaining an estimated half-life of residency in the stereocilia of ?5–7 h. A computer simulation of our data indicates that PMCA2 has an estimated global diffusion coefficient of 0.01– 0.005 ?m2/s. Using a green fluorescent protein tag, we observed that PMCA2 is rapidly delivered to the apical cell border from where it diffuses to the entire stereocilia surface. Fluorescence recovery after photobleaching experiments show that ?60% of PMCA2 in the stereocilia exhibit high mobility with a diffusion coefficient of 0.1– 0.2 ?m2/s, whereas the remaining pool represents a relatively immobile fraction. These results suggest that PMCA2 molecules maintain transient interactions with other components of the stereocilia, and the mobile pool of PMCA2 mediates the exchange between the stereocilia and the removal and delivery sites at the periphery of the apical cell surface. This rapid turnover of a major stereocilia membrane protein matches the previously described rapid turnover of proteins of the stereocilia actin core, further demonstrating that these organelles undergo rapid continuous renewal. PMID:16763047

  9. Mobility behaviour of n-channel and p-channel MOSFETs with oxynitride gate dielectrics formed by low-pressure rapid thermal chemical vapor deposition

    Microsoft Academic Search

    Eric M. Vogel; Winford L. Hill; Veena Misra; Peter K. McLarty; Jimmie J. Wortman; J. R. Hauser; P. Morfouli; GCrard Ghibaudo; T. Ouisse

    1996-01-01

    The electric field dependence of electron and hole mobility was investigated in n-channel and p-channel metal-oxide-semiconductor field-effect transistors with oxynitride gate dielectrics formed using low-pressure rapid thermal chemical vapor deposition with SiH4, N2O and NH3 as the reactive gases. The peak electron mobility was observed to decrease with increasing nitrogen and hydrogen concentration whereas the high-field mobility degradation was improved.

  10. Rapid field installation, easy shipping with containerized mobile pipe coating plant

    Microsoft Academic Search

    Hale

    1985-01-01

    A one-of-a-kind mobile pipe coating plant designed to apply four of today's most sophisticated pipe coating materials has been developed by the Ramco Carlson organization in Tulsa, Okla., and Aberdeen Scotland. The mobile plant is designed to apply, through the interchange of specialized containers, any of these coatings: fusion-boded epoxy or heat-shrinkable tape. Every aspect of the plant was designed

  11. Influence of the elastic deformation of a foam on its mobility in channels of linearly varying width.

    PubMed

    Dollet, Benjamin; Jones, Siân A; Méheust, Yves; Cantat, Isabelle

    2014-08-01

    We study foam flow in an elementary model porous medium consisting of a convergent and a divergent channel positioned side by side and possessing a fixed joint porosity. Configurations of converging or diverging channels are ubiquitous at the pore scale in porous media, as all channels linking pores possess a converging and diverging part. The resulting flow kinematics imposes asymmetric bubble deformations in the two channels, which modulate foam-wall friction and strongly impact the flux distribution. We measure, as well as quantitatively predict, the ratio of the fluxes in the two channels as a function of the channel widths by modeling pressure drops of both viscous and capillary origins. This study reveals the crucial importance of boundary-induced bubble deformation on the mobility of a flowing foam, resulting in particular in flow irreversibility. PMID:25215819

  12. Mobile Sensor Navigation Using Rapid RF-Based Angle of Arrival Localization

    Microsoft Academic Search

    Isaac Amundson; Xenofon D. Koutsoukos; János Sallai; Ákos Lédeczi

    2011-01-01

    Over the past decade, wireless sensor networks have advanced in terms of hardware design, communication protocols, resource efficiency, and other aspects. Recently, there has been growing interest in mobile wireless sensor networks, and several small-profile sensing devices that are able to control their own movement have already been developed. Unfortunately, resource constraints inhibit the use of traditional navigation methods, because

  13. Rapid imaging, detection and quantification of Giardia lamblia cysts using mobile-phone based fluorescent microscopy and machine learning.

    PubMed

    Koydemir, Hatice Ceylan; Gorocs, Zoltan; Tseng, Derek; Cortazar, Bingen; Feng, Steve; Chan, Raymond Yan Lok; Burbano, Jordi; McLeod, Euan; Ozcan, Aydogan

    2015-03-01

    Rapid and sensitive detection of waterborne pathogens in drinkable and recreational water sources is crucial for treating and preventing the spread of water related diseases, especially in resource-limited settings. Here we present a field-portable and cost-effective platform for detection and quantification of Giardia lamblia cysts, one of the most common waterborne parasites, which has a thick cell wall that makes it resistant to most water disinfection techniques including chlorination. The platform consists of a smartphone coupled with an opto-mechanical attachment weighing ~205 g, which utilizes a hand-held fluorescence microscope design aligned with the camera unit of the smartphone to image custom-designed disposable water sample cassettes. Each sample cassette is composed of absorbent pads and mechanical filter membranes; a membrane with 8 ?m pore size is used as a porous spacing layer to prevent the backflow of particles to the upper membrane, while the top membrane with 5 ?m pore size is used to capture the individual Giardia cysts that are fluorescently labeled. A fluorescence image of the filter surface (field-of-view: ~0.8 cm(2)) is captured and wirelessly transmitted via the mobile-phone to our servers for rapid processing using a machine learning algorithm that is trained on statistical features of Giardia cysts to automatically detect and count the cysts captured on the membrane. The results are then transmitted back to the mobile-phone in less than 2 minutes and are displayed through a smart application running on the phone. This mobile platform, along with our custom-developed sample preparation protocol, enables analysis of large volumes of water (e.g., 10-20 mL) for automated detection and enumeration of Giardia cysts in ~1 hour, including all the steps of sample preparation and analysis. We evaluated the performance of this approach using flow-cytometer-enumerated Giardia-contaminated water samples, demonstrating an average cyst capture efficiency of ~79% on our filter membrane along with a machine learning based cyst counting sensitivity of ~84%, yielding a limit-of-detection of ~12 cysts per 10 mL. Providing rapid detection and quantification of microorganisms, this field-portable imaging and sensing platform running on a mobile-phone could be useful for water quality monitoring in field and resource-limited settings. PMID:25537426

  14. Rapid on-site determination of chlorobenzene in water samples using ion mobility spectrometry

    Microsoft Academic Search

    H. Borsdorf; A. Rämmler; D. Schulze; K. O. Boadu; B. Feist; H. Weiß

    2001-01-01

    A fast screening procedure for water samples contaminated with chlorobenzene was developed. The volatile organic compounds were purged from water samples and their concentration was determined with ion mobility spectrometry (IMS) using corona discharge (CD) ionization. This analytical procedure permits the determination of chlorobenzene with a concentration range of 3–30mg\\/l. The analytical results are available within 5min. In order to

  15. [Study of mobile Raman spectroscopy for rapid evaluation of deteriorating of art materials under UV irradiation].

    PubMed

    Luo, Xi-yun; Ye, Fei; Wu, Lai-ming; Yuan, Sheng-wei; Zhang, Wei-bing; Du, Yi-ping

    2010-09-01

    Identification and characterization of materials used in cultural heritage and conservation can provide important information for dating, authentication and deteriorating situation in general. How to extract useful information from these materials in-situ is one of the main concerns. Application of mobile Raman spectroscopy for this purpose has great attentions for scientists and conservators. The present paper aims to investigate the mobile Raman spectroscopy in studying the effect of UV light on the deterioration of silk, seal ink and Chinese traditional colorants such as kermes, vermillion and zhubiao, which is commonly appeared on painted works of art, and the silk sample is also often used as an consolidant for repairing destroyed textile objects. Spectra were recorded from predefined regions on the samples before and after ultraviolet radiation with 360 nm wavelength and 0.68 W x m(-2) intensity. The result revealed obvious effects of ultraviolet radiation on the materials simulated in this research. The original kind of seal ink has been clearly identified. The changes in spectra of all samples with and without UV radiation were further distinguished and studied. The result will assist for scientists and conservators to determine the safe treatments and suitable environmental condition for storage, display and transport. The result will also help for studying mechanism of deterioration of museum objects influenced by environmental factors. The mobile Raman spectroscopy showed a suitable and convenient means for in-situ non-destructive detection and study of deterioration in practical conditions. PMID:21105406

  16. A Mobile Acoustic Subsurface Sensing (MASS) system for rapid roadway assessment.

    PubMed

    Lu, Yifeng; Zhang, Yi; Cao, Yinghong; McDaniel, J Gregory; Wang, Ming L

    2013-01-01

    Surface waves are commonly used for vibration-based nondestructive testing for infrastructure. Spectral Analysis of Surface Waves (SASW) has been used to detect subsurface properties for geologic inspections. Recently, efforts were made to scale down these subsurface detection approaches to see how they perform on small-scale structures such as concrete slabs and pavements. Additional efforts have been made to replace the traditional surface-mounted transducers with non-contact acoustic transducers. Though some success has been achieved, most of these new approaches are inefficient because they require point-to-point measurements or off-line signal analysis. This article introduces a Mobile Acoustic Subsurface Sensing system as MASS, which is an improved surface wave based implementation for measuring the subsurface profile of roadways. The compact MASS system is a 3-wheeled cart outfitted with an electromagnetic impact source, distance register, non-contact acoustic sensors and data acquisition/ processing equipment. The key advantage of the MASS system is the capability to collect measurements continuously at walking speed in an automatic way. The fast scan and real-time analysis advantages are based upon the non-contact acoustic sensing and fast air-coupled surface wave analysis program. This integration of hardware and software makes the MASS system an efficient mobile prototype for the field test. PMID:23698266

  17. Rapid force generation is impaired in cerebral palsy and is related to decreased muscle size and functional mobility.

    PubMed

    Moreau, Noelle G; Falvo, Michael J; Damiano, Diane L

    2012-01-01

    Limb movements involving contraction times of 50-200 ms occur in many everyday activities, such as gait, which is faster than the time required to generate maximal force. Therefore, the ability to rapidly produce force may be even more important for the performance of functional activities. In this study rate of force development (RFD) and impulse of the knee extensors were examined in 12 ambulatory children with cerebral palsy (CP) (age: 11.9 ± 2.9 years) and 11 with typical development (TD) (Age: 11.3 ± 3.0 years). The relationship with muscle architecture and functional mobility was also determined. RFD and impulse were calculated during a maximal isometric knee extension contraction. Rectus femoris (RF) cross-sectional area and RF and vastus lateralis (VL) muscle thickness (MT), fascicle length (FL), and fascicle angle (FA) were measured using ultrasound imaging. Gait temporal-spatial parameters, Pediatric Outcomes Data Collection Instrument (PODCI), and Activities Scale for Kids performance version (ASKp) were collected. Although VL MT was the primary determinant of RFD and impulse in CP, FA and FL were also significant predictors in the TD group. RFD and impulse were significantly lower in CP compared to TD (70% decrease) in addition to maximal strength (50% decrease). RFD and impulse were predictive of measures of functional mobility, including gait, transfers, and sports and higher level activities but not temporal-spatial gait measures. Results suggest that the ability to rapidly generate torque may be of greater importance than maximal strength during certain tasks, such as transfers and sports and higher level activities. PMID:21930383

  18. Rapid and Accurate Detection of Urinary Pathogens by Mobile IMS-Based Electronic Nose: A Proof-of-Principle Study

    PubMed Central

    Roine, Antti; Saviauk, Taavi; Kumpulainen, Pekka; Karjalainen, Markus; Tuokko, Antti; Aittoniemi, Janne; Vuento, Risto; Lekkala, Jukka; Lehtimäki, Terho; Tammela, Teuvo L.; Oksala, Niku K. J.

    2014-01-01

    Urinary tract infection (UTI) is a common disease with significant morbidity and economic burden, accounting for a significant part of the workload in clinical microbiology laboratories. Current clinical chemisty point-of-care diagnostics rely on imperfect dipstick analysis which only provides indirect and insensitive evidence of urinary bacterial pathogens. An electronic nose (eNose) is a handheld device mimicking mammalian olfaction that potentially offers affordable and rapid analysis of samples without preparation at athmospheric pressure. In this study we demonstrate the applicability of ion mobility spectrometry (IMS) –based eNose to discriminate the most common UTI pathogens from gaseous headspace of culture plates rapidly and without sample preparation. We gathered a total of 101 culture samples containing four most common UTI bacteries: E. coli, S. saprophyticus, E. faecalis, Klebsiella spp and sterile culture plates. The samples were analyzed using ChemPro 100i device, consisting of IMS cell and six semiconductor sensors. Data analysis was conducted by linear discriminant analysis (LDA) and logistic regression (LR). The results were validated by leave-one-out and 5-fold cross validation analysis. In discrimination of sterile and bacterial samples sensitivity of 95% and specificity of 97% were achieved. The bacterial species were identified with sensitivity of 95% and specificity of 96% using eNose as compared to urine bacterial cultures. In conclusion: These findings strongly demonstrate the ability of our eNose to discriminate bacterial cultures and provides a proof of principle to use this method in urinanalysis of UTI. PMID:25526592

  19. Interspecific comparisons of lymph volume and lymphatic fluxes: do lymph reserves and lymph mobilization capacities vary in anurans from different environments?

    PubMed

    Hillman, Stanley S; Drewes, Robert C; Hedrick, Michael S; Withers, Philip C

    2011-01-01

    The femoral lymph sac volumes and lymph mobilization capacity were compared in three anuran species that span a range of environments, dehydration tolerance, ability to maintain blood volume with dehydration, and degrees of development of skeletal muscles putatively involved in moving lymph vertically to the posterior lymph hearts. The femoral lymph sac volume determined by Evans blue injection and dilution in the femoral lymph sac varied interspecifically. The semiaquatic species, Lithobates catesbeianus, had the greatest apparent lymph volume expressed either as 18.7 mL kg body mass?¹ or 94 mL kg thigh mass?¹, compared with both the terrestrial and aquatic species, Rhinella marina (7.3 mL kg body mass?¹ and 57 mL kg thigh mass?¹) and Xenopus laevis (6.5 mL kg body mass?¹ and 40 mL kg thigh mass?¹, respectively. Injections of Evans blue into the subvertebral lymph sac, which communicates with both pairs of lymph hearts, yielded the highest rates of lymph return to the circulation in all three species. The most terrestrial species had a greater rate of lymphatic return from the subvertebral lymph sac, compared with the other two species. The rate of lymph flux from the femoral sac varied interspecifically and was correlated with the number and development of skeletal muscles involved in lymph movement. The results indicated that the three species differ in both the volume of lymph present and the capacity to return lymph. Lymph flux was correlated with habitat and the ability to maintain blood volume when challenged by dehydration or hemorrhage, whereas femoral lymph volume was not correlated with these factors. PMID:21527817

  20. Pocket pathologist: A mobile application for rapid diagnostic surgical pathology consultation

    PubMed Central

    Hartman, Douglas J.; Parwani, Anil V.; Cable, Bill; Cucoranu, Ioan C.; McHugh, Jeff S.; Kolowitz, Brian J.; Yousem, Samuel A.; Palat, Vijaykumar; Reden, Anna Von; Sloka, Stephen; Lauro, Gonzalo Romero; Ahmed, Ishtiaque; Pantanowitz, Liron

    2014-01-01

    Introduction: Telepathology allows the digital transmission of images for rapid access to pathology experts. Recent technologic advances in smartphones have allowed them to be used to acquire and transmit digital images of the glass slide, representing cost savings and efficiency gains over traditional forms of telepathology. We report our experience with developing an iPhone application (App - Pocket Pathologist) to facilitate rapid diagnostic pathology teleconsultation utilizing a smartphone. Materials and Methods: A secure, web-based portal (http://pathconsult.upmc.com/) was created to facilitate remote transmission of digital images for teleconsultation. The App augments functionality of the web-based portal and allows the user to quickly and easily upload digital images for teleconsultation. Image quality of smartphone cameras was evaluated by capturing images using different adapters that directly attach phones to a microscope ocular lens. Results: The App was launched in August 2013. The App facilitated easy submission of cases for teleconsultation by limiting the number of data entry fields for users and enabling uploading of images from their smartphone's gallery wirelessly. Smartphone cameras properly attached to a microscope create static digital images of similar quality to a commercial digital microscope camera. Conclusion: Smartphones have great potential to support telepathology because they are portable, provide ubiquitous internet connectivity, contain excellent digital cameras, and can be easily attached to a microscope. The Pocket Pathologist App represents a significant reduction in the cost of creating digital images and submitting them for teleconsultation. The iPhone App provides an easy solution for global users to submit digital pathology images to pathology experts for consultation. PMID:24843822

  1. A rapid functional assay for the human trace amine-associated receptor 1 based on the mobilization of internal calcium.

    PubMed

    Navarro, Hernán A; Gilmour, Brian P; Lewin, Anita H

    2006-09-01

    The molecular targets for trace amines (TAs) such as p-tyramine and beta-phenylethylamine have been recently discovered and have been shown to comprise a family of G-protein-coupled receptors based on DNA sequence homologies. These have been termed trace amine-associated receptors (TAARs) because TAs do not activate all of the identified receptors. Because TA may be involved in modulating a variety of behaviors including mood, cognition, and addiction, it is of interest to discover novel ligands for TAARs to probe the role TAs play in brain function. Pharmacophore development for the G(s)-coupled human TAAR1 (hTAAR1) would be aided by a rapid functional assay amenable to screening libraries of compounds. Accordingly, the authors used RD-HGA16 CHO-1 cells from Molecular Devices, which stably express the promiscuous G(q), G(alpha16), to create a cell line stably expressing hTAAR1, thereby coupling receptor activation to the mobilization of internal calcium. They used this cell line to develop a homogenous fluorometric imaging plate reader-based assay using the Calcium 3 fluorescent dye. The EC50 and Emax data obtained for known TAs are in close agreement with previous work using transient hTAAR1 expression systems or a chimeric receptor. These data indicate that the hTAAR1 retains its reported pharmacological characteristics when coupled to G(alpha16). PMID:16831861

  2. Kinect Technology Game Play to Mimic Quake Catcher Network (QCN) Sensor Deployment During a Rapid Aftershock Mobilization Program (RAMP)

    NASA Astrophysics Data System (ADS)

    Kilb, D. L.; Yang, A.; Rohrlick, D.; Cochran, E. S.; Lawrence, J.; Chung, A. I.; Neighbors, C.; Choo, Y.

    2011-12-01

    The Kinect technology allows for hands-free game play, greatly increasing the accessibility of gaming for those uncomfortable using controllers. How it works is the Kinect camera transmits invisible near-infrared light and measures its "time of flight" to reflect off an object, allowing it to distinguish objects within 1 centimeter in depth and 3 mm in height and width. The middleware can also respond to body gestures and voice commands. Here, we use the Kinect Windows SDK software to create a game that mimics how scientists deploy seismic instruments following a large earthquake. The educational goal of the game is to allow the players to explore 3D space as they learn about the Quake Catcher Network's (QCN) Rapid Aftershock Mobilization Program (RAMP). Many of the scenarios within the game are taken from factual RAMP experiences. To date, only the PC platform (or a Mac running PC emulator software) is available for use, but we hope to move to other platforms (e.g., Xbox 360, iPad, iPhone) as they become available. The game is written in programming language C# using Microsoft XNA and Visual Studio 2010, graphic shading is added using High Level Shader Language (HLSL), and rendering is produced using XNA's graphics libraries. Key elements of the game include selecting sensor locations, adequately installing the sensor, and monitoring the incoming data. During game play aftershocks can occur unexpectedly, as can other problems that require attention (e.g., power outages, equipment failure, and theft). The player accrues points for quickly deploying the first sensor (recording as many initial aftershocks as possible), correctly installing the sensors (orientation with respect to north, properly securing, and testing), distributing the sensors adequately in the region, and troubleshooting problems. One can also net points for efficient use of game play time. Setting up for game play in your local environment requires: (1) the Kinect hardware ( $145); (2) a computer with a Windows operating system (Mac users can use a Windows emulator); and (3) our free QCN game software (available from http://quakeinfo.ucsd.edu/ dkilb/WEB/QCN/Downloads.html).

  3. Rapid analysis of captopril in human plasma and pharmaceutical preparations by headspace solid phase microextraction based on polypyrrole film coupled to ion mobility spectrometry.

    PubMed

    Karimi, Akarm; Alizadeh, Naader

    2009-07-15

    A rapid, simple, and sensitive headspace solid phase microextraction coupled to ion mobility spectrometry (HS-SPME-IMS) method is presented for analysis of the highly specific angiotensin-converting enzyme (ACE) inhibitor, captopril (CAP). Positive ion mobility spectra of CAP were acquired with an ion mobility spectrometer equipped with a corona discharge ionization source. Mass-to-mobility correlation equation was used to identify product ions. A dodecylsulfate-doped polypyrrole (PPy-DS) coating was used as a fiber for SPME. The results showed that PPy-DS based SPME fiber was suitable for successfully extracting CAP from human blood plasma and pharmaceutical samples. The HS-SPME-IMS method provided good repeatability (R.S.D.s<4%) for aqueous and spiked plasma samples. The calibration graphs were linear in the range of 10-300 ng mL(-1) (R(2)>0.99) and detection limits were 7.5 ng mL(-1) for aqueous and 6.3 ng mL(-1) for plasma blank samples. Finally, a standard addition calibration method was applied to HS-SPME-IMS technique for the analysis of blood plasma samples and tablets. Purpose method seemed to be suitable for the analysis of CAP in plasma samples as it is not time consuming (state total time from sample preparation to analysis), it required only small quantities of the sample, and no derivatization was required. PMID:19559908

  4. Rapid and long-term effects of water deficit on gas exchange and hydraulic conductance of silver birch trees grown under varying atmospheric humidity

    PubMed Central

    2014-01-01

    Background Effects of water deficit on plant water status, gas exchange and hydraulic conductance were investigated in Betula pendula under artificially manipulated air humidity in Eastern Estonia. The study was aimed to broaden an understanding of the ability of trees to acclimate with the increasing atmospheric humidity predicted for northern Europe. Rapidly-induced water deficit was imposed by dehydrating cut branches in open-air conditions; long-term water deficit was generated by seasonal drought. Results The rapid water deficit quantified by leaf (?L) and branch water potentials (?B) had a significant (P?rapid water deficit with respect to two characteristics - leaf conductance to water vapour and leaf hydraulic conductance. Disproportionate changes in sensitivity of stomatal versus leaf hydraulic conductance to water deficit will impose greater risk of desiccation-induced hydraulic dysfunction on the plants, grown under high atmospheric humidity, in case of sudden weather fluctuations, and might represent a potential threat in hemiboreal forest ecosystems. There is no trade-off between plant hydraulic capacity and photosynthetic water-use efficiency on short time scale. PMID:24655599

  5. Developing a Control Architecture for Multiple Unmanned Aerial Vehicles to Search and Localize RF Time-Varying Mobile Targets: Part I

    Microsoft Academic Search

    Daniel J. Pack; George W. P. York

    2005-01-01

    In this paper, we present a control architecture that allows multiple Unmanned Aerial Vehicles (UAVs) to cooperatively detect mobile RF (Radio Frequency) emitting ground targets. The architecture is developed under the premise that UAVs are controlled as a distributed system. The distributed system-based technique maximizes the search and detection capabilities of multiple UAVs. We use a hybrid approach that combines

  6. Abstract Nanoparticles are rapidly emerging as promising vehicles for next-generation therapeutic delivery. These highly mobile nanomaterials exhibit

    E-print Network

    Espinosa, Horacio D.

    225 Abstract Nanoparticles are rapidly emerging as promising vehicles for next describes a unique tool for functional nanoparticle delivery, called the Nanofountain Probe of microfluidic tools developed to deliver nanoparticles is presented. We then focus on the function

  7. Rapid force generation is impaired in cerebral palsy and is related to decreased muscle size and functional mobility

    Microsoft Academic Search

    Noelle G. Moreau; Michael J. Falvo; Diane L. Damiano

    Limb movements involving contraction times of 50–200ms occur in many everyday activities, such as gait, which is faster than the time required to generate maximal force. Therefore, the ability to rapidly produce force may be even more important for the performance of functional activities. In this study rate of force development (RFD) and impulse of the knee extensors were examined

  8. Automatic dilution gaging of rapidly varying flow

    USGS Publications Warehouse

    Duerk, M.D.

    1983-01-01

    Obtaining discharge ratings at urban gaging stations is often difficult. Results of using an automated constant-rate dye-dilution technique to measure discharge at two sites in Madison, Wisconsin, are presented. The sites selected have well-defined stage-discharge ratings, developed during previous hydrologic studies. One site is a 60-inch-diameter concrete storm sewer and the other a concrete-lined open trapezoidal channel. Equipment selected to automate the method included a portable automatic water sampler, four-channel event recorder; and for dye injection, a peristaltic pump. An electrical switching circuit was designed to coordinate the operation of the water sampler, injection pump, and four-channel recorder. During the data-collection period of 1 year, a total of 20 storms was monitored. The analyses showed that the discharges measured by dye-dilution techniques ranged from + or - 5 to + or - 10 percent of the discharges determined from ratings established by current-meter measurements. Larger differences were noted at the start of and on the rising limb of four hydrographs. Of the 20 storms monitored, 17 produced acceptable results. Peak discharges by the dilution method at the open-channel site ranged from 0 to 12 percent departures from the existing rating, whereas the peak discharge by the dilution method at the storm-sewer site ranged from 0 to 5 percent departures from the existing rating. (UGGS)

  9. Direct infusion electrospray ionization-ion mobility high resolution mass spectrometry (DIESI-IM-HRMS) for rapid characterization of potential bioprocess streams.

    PubMed

    Munisamy, Sharon M; Chambliss, C Kevin; Becker, Christopher

    2012-07-01

    Direct infusion electrospray ionization?-?ion mobility?-?high resolution mass spectrometry (DIESI-IM-HRMS) has been utilized as a rapid technique for the characterization of total molecular composition in "whole-sample" biomass hydrolysates and extracts. IM-HRMS data reveal a broad molecular weight distribution of sample components (up to 1100 m/z) and provide trendline isolation of feedstock components from those introduced "in process." Chemical formulas were obtained from HRMS exact mass measurements (with typical mass error less than 5 ppm) and were consistent with structural carbohydrates and other lignocellulosic degradation products. Analyte assignments are supported via IM-MS collision-cross-section measurements and trendline analysis (e.g., all carbohydrate oligomers identified in a corn stover hydrolysate were found to fall within 6% of an average trendline). These data represent the first report of collision cross sections for several negatively charged carbohydrates and other acidic species occurring natively in biomass hydrolysates. PMID:22592813

  10. Specification of Mobile Transparency

    Microsoft Academic Search

    Andry Rakotonirainy; Andy Bond

    There is a rapid growth in mobile computing which will allow the user to access information fr om anywhere at any time. It is driven by two factors: (1) the success of mobile hardware such as mobile phones, lap-tops, pagers and wireless network infrastructure promoted by the industry (2); mobile softwar e and platforms which are the subject of an

  11. Time varying networks and the weakness of strong ties

    PubMed Central

    Karsai, Márton; Perra, Nicola; Vespignani, Alessandro

    2014-01-01

    In most social and information systems the activity of agents generates rapidly evolving time-varying networks. The temporal variation in networks' connectivity patterns and the ongoing dynamic processes are usually coupled in ways that still challenge our mathematical or computational modelling. Here we analyse a mobile call dataset and find a simple statistical law that characterize the temporal evolution of users' egocentric networks. We encode this observation in a reinforcement process defining a time-varying network model that exhibits the emergence of strong and weak ties. We study the effect of time-varying and heterogeneous interactions on the classic rumour spreading model in both synthetic, and real-world networks. We observe that strong ties severely inhibit information diffusion by confining the spreading process among agents with recurrent communication patterns. This provides the counterintuitive evidence that strong ties may have a negative role in the spreading of information across networks. PMID:24510159

  12. Make a Mobile!

    NSDL National Science Digital Library

    2012-06-26

    In this activity, learners make mobiles to explore the concepts of balance, counterbalance, weight, and counterweight. Learners are encouraged to work in groups or with their families to create balanced mobiles using a variety of materials of varying weights.

  13. Mobile video delivery with HTTP

    Microsoft Academic Search

    Kevin J. Ma; Radim Bartos; Swapnil Bhatia; Raj Nair

    2011-01-01

    Expansion in 3G cellular coverage and the emergence of more powerful mobile devices has increased demand for massively scalable mobile video delivery. The rapid adoption of the third screen as a primary screen for video has highlighted inefficiencies in the mobile delivery ecosystem and scalability issues in the mobile delivery infrastructure. This article provides an overview of the current mobile

  14. Results from the Quake-Catcher Network Rapid Aftershock Mobilization Program (QCN-RAMP) Following the M8.8 Maule, Chile Earthquake

    NASA Astrophysics Data System (ADS)

    Chung, A. I.; Neighbors, C.; Belmonte-Pool, A.; Miller, M. R.; Sepulveda, H. H.; Christensen, C. M.; Liao, E.; Cochran, E. S.; Lawrence, J. F.

    2010-12-01

    Following the 27 February 2010 M8.8 earthquake in Maule, Chile we initiated a QCN Rapid Aftershock Mobilization Program (RAMP). We had an overwhelming number of people eager to participate in the RAMP and rapidly installed 100 USB sensors to record aftershocks. The USB accelerators were deployed in regions directly affected by the mainshock and were densely concentrated in the Bío-Bío region of Chile. Trigger metadata was transferred in real-time and waveform data were recorded continuously at 50 samples per second. Most trigger metadata was received at the QCN server within 7 seconds and waveform data was uploaded in 10 minute-long segments. Using the aftershock trigger data, we refined our triggering and event detection algorithms and retrospectively tested whether the network can rapidly and accurately identify the location and magnitude of moderate to large aftershocks (M>4). We are also currently expanding our network in many locations around the world, including Southern California. Because of our low-cost, easy to install sensors, we can quickly deploy a densely distributed network of relatively inexpensive seismic stations throughout a region. We also examine whether the data collected by low-cost USB accelerometers can be used to estimate local site response, which is the amplification of ground motion caused by local site conditions. Site response can be used to predict structural damage, with greater damage found in areas of high site amplification. As observed in previous large earthquakes, as well as during the 2010 M8.8 Maule, Chile earthquake, areas of intense structural damage are spatially limited so it is important to have dense seismic instrumentation to better predict highly localized site response. To estimate site response, we use data from large aftershocks recorded on QCN sensors in the Bío-Bío region of Chile. We compare the S-waves and coda-wave spectral ratio methods to determine relative site amplification effects. These results suggest that, with high station densities, QCN sensors can provide detailed maps of local site conditions for use in seismic hazard analysis. Our preliminary results from the data collected from QCN stations around the world suggest that MEMS sensors installed in homes, schools, and offices provide a way to dramatically increase the density of strong motion observations for use in seismic hazard analysis, source rupture imaging, and earthquake early warning.

  15. Rapid design space exploration of heterogeneous embedded systems using symbolic search and multi-granular simulation

    Microsoft Academic Search

    Sumit Mohanty; Viktor K. Prasanna; Sandeep Neema; James R. Davis

    2002-01-01

    In addition to integrating different Intellectual Property cores, heterogeneous embedded systems provide several architecture knobs such as voltage, operating frequency, configuration, etc. that can be varied to optimize performance. Such flexibilities results in a large design space making system optimization a very challenging task. Moreover, such systems operate in mobile and other power constrained environments. Therefore, in addition to rapid

  16. Stochastic differential equations for modeling, estimation and identification of mobile-to-mobile communication channels

    Microsoft Academic Search

    Mohammed M. Olama; Seddik M. Djouadi; Charalambos D. Charalambous

    2009-01-01

    Mobile-to-mobile networks are characterized by node mobility that makes the propagation environment time varying and subject to fading. As a consequence, the statistical characteristics of the received signal vary continuously, giving rise to a Doppler power spectral density (DPSD) which varies from one observation instant to the next. The current models do not capture and track the time varying characteristics.

  17. Rapid screening of precursor and degradation products of chemical warfare agents in soil by solid-phase microextraction ion mobility spectrometry (SPME–IMS)

    Microsoft Academic Search

    Preshious Rearden; Peter B. Harrington

    2005-01-01

    The use of solid-phase microextraction (SPME) coupled to ion mobility spectrometry (IMS) to detect precursor and degradation products of chemical warfare agents (CWAs) as soil contaminants was investigated. The development and characterization of a system to interface a thermal desorption solid-phase microextraction inlet with a hand held ion mobility spectrometer was demonstrated. The analytes used in this study were diisopropyl

  18. Enabling Adaptive Rate and Relay Selection for 802.11 Mobile Ad Hoc Networks

    E-print Network

    Mehta, Neil; Wang, Wenye

    2011-01-01

    Mobile ad hoc networks (MANETs) are self-configuring wireless networks that lack permanent infrastructure and are formed among mobile nodes on demand. Rapid node mobility results in dramatic channel variation, or fading, that degrades MANET performance. Employing channel state information (CSI) at the transmitter can improve the throughput of routing and medium access control (MAC) protocols for mobile ad hoc networks. Several routing algorithms in the literature explicitly incorporate the fading signal strength into the routing metric, thus selecting the routes with strong channel conditions. While these studies show that adaptation to the time-variant channel gain is beneficial in MANETs, they do not address the effect of the outdated fading CSI at the transmitter. For realistic mobile node speeds, the channel gain is rapidly varying, and becomes quickly outdated due the feedback delay. We analyze the link throughput of joint rate adaptation and adaptive relay selection in the presence of imperfect CSI. Mor...

  19. The Research on Dynamic Self-Adaptive Network Security Model Based on Mobile Agent

    Microsoft Academic Search

    Jiang Tao; Liu Ji-ren; Qin Yang

    2000-01-01

    The rapid development and wide application of computer networks presents a new challenge to information security and network security. Traditional security models and single security technology cannot keep up with the change of complicated network structure and varied intrusion measures. Network security management based on policy has traits of low management cost, high agility and wide applicability. The mobile agent

  20. SAMP: scalable application-layer mobility protocol

    Microsoft Academic Search

    Sangheon Pack; aekyoung Kwon

    2006-01-01

    As wireless\\/mobile technologies evolve, the market for mobile Internet is rapidly growing. To proliferate mobile Internet market, scalable mobility support is a key question. In this article, we propose a scalable application-layer mobility protocol (SAMP) that is based on peer-to-peer (P2P) overlay networking and session initiation protocol (SIP). SAMP keeps track of locations of mobile nodes leveraging SIP mobility functions.

  1. Workflow on Mobile Phones

    Microsoft Academic Search

    Riitta Hellman

    2008-01-01

    Mobile devices and services are rapidly becoming a common property. In this paper, we describe what this development implies in terms of usability of complex services. Management of workflow in the context of interactive services is focussed on. It is shown how to implement workflow on mobile phones, and how to increase the usability of complex services by application of

  2. Dynamic Graph Properties of Mobile Networks under Levy Walk Mobility

    E-print Network

    Zussman, Gil

    Dynamic Graph Properties of Mobile Networks under Levy Walk Mobility Berk Birand, Murtaza Zafer of the underlying graph representing the network. Since such a graph is inherently time- varying, quantifying. In this paper, we study change in the dynamic graph structure of mobile wireless networks that evolve over time

  3. The Rapidly Deployable Radio Network

    E-print Network

    Evans, Joseph B.; Minden, Gary J.; Shanmugan, K. S.; Prescott, Glenn Eugene; Frost, Victor S.; Ewy, Ben; Sanchez, R; Sparks, Craig; Malinimohan, K.; Roberts, James A.; Plumb, R. G.; Petr, Dave

    1999-04-01

    antenna beams, programmable radios, adaptive protocols at the link layer, and mobile node management. This paper describes the architecture for the Rapidly Deployable Radio Network and a prototype system built to evaluate key system components....

  4. Thrombopoietin, flt3, and kit ligands together suppress apoptosis of human mobilized CD34 + cells and recruit primitive CD34 +Thy1 + cells into rapid division

    Microsoft Academic Search

    Lesley J Murray; Judy C Young; Linda J Osborne; Karin M Luens; Roland Scollay; Beth L Hill

    1999-01-01

    Various combinations of cytokines have profoundly different effects on inhibition of apoptosis and stimulation of self-renewal division of hematopoietic stem cells (HSC) in short-term, ex vivo culture. Our goal was to quantitate expansion of cells with a primitive CD34+Thy-1+ phenotype, as well as cell cycling, division history, differentiation, and apoptosis of CD34+ cells enriched from normal donor mobilized peripheral blood

  5. Improving Bay Area Rapid Transit (BART) district Connectivity and Access with the Segway Human Transporter and other Low Speed Mobility Devices

    Microsoft Academic Search

    Caroline J. Rodier; Amanda M. Eaken

    2004-01-01

    This report documents the results of the first phase of a two-part project: (1) research and feasibility analysis and (2) the field operational test and research of a shared-use Segway HT, electric bicycle, and bicycle rental model linked to a Bay Area Rapid Transit (BART) District station and surrounding employment centers. The feasibility analysis identified the Pleasant Hill BART station

  6. Buffer mobility and the regulation of neuronal calcium domains

    PubMed Central

    Matthews, Elizabeth A.; Dietrich, Dirk

    2015-01-01

    The diffusion of calcium inside neurons is determined in part by the intracellular calcium binding species that rapidly bind to free calcium ions upon entry. It has long been known that some portion of a neuron’s intracellular calcium binding capacity must be fixed or poorly mobile, as calcium diffusion is strongly slowed in the intracellular environment relative to diffusion in cytosolic extract. The working assumption was that these immobile calcium binding sites are provided by structural proteins bound to the cytoskeleton or intracellular membranes and may thereby be relatively similar in composition and capacity across different cell types. However, recent evidence suggests that the immobile buffering capacity can vary greatly between cell types and that some mobile calcium binding proteins may alter their mobility upon binding calcium, thus blurring the line between mobile and immobile. The ways in which immobile buffering capacity might be relevant to different calcium domains within neurons has been explored primarily through modeling. In certain regimes, the presence of immobile buffers and the interaction between mobile and immobile buffers have been shown to result in complex spatiotemporal patterns of free calcium. In total, these experimental and modeling findings call for a more nuanced consideration of the local intracellular calcium microenvironment. In this review we focus on the different amounts, affinities, and mobilities of immobile calcium binding species; propose a new conceptual category of physically diffusible but functionally immobile buffers; and discuss how these buffers might interact with mobile calcium binding partners to generate characteristic calcium domains. PMID:25750615

  7. Buffer mobility and the regulation of neuronal calcium domains.

    PubMed

    Matthews, Elizabeth A; Dietrich, Dirk

    2015-01-01

    The diffusion of calcium inside neurons is determined in part by the intracellular calcium binding species that rapidly bind to free calcium ions upon entry. It has long been known that some portion of a neuron's intracellular calcium binding capacity must be fixed or poorly mobile, as calcium diffusion is strongly slowed in the intracellular environment relative to diffusion in cytosolic extract. The working assumption was that these immobile calcium binding sites are provided by structural proteins bound to the cytoskeleton or intracellular membranes and may thereby be relatively similar in composition and capacity across different cell types. However, recent evidence suggests that the immobile buffering capacity can vary greatly between cell types and that some mobile calcium binding proteins may alter their mobility upon binding calcium, thus blurring the line between mobile and immobile. The ways in which immobile buffering capacity might be relevant to different calcium domains within neurons has been explored primarily through modeling. In certain regimes, the presence of immobile buffers and the interaction between mobile and immobile buffers have been shown to result in complex spatiotemporal patterns of free calcium. In total, these experimental and modeling findings call for a more nuanced consideration of the local intracellular calcium microenvironment. In this review we focus on the different amounts, affinities, and mobilities of immobile calcium binding species; propose a new conceptual category of physically diffusible but functionally immobile buffers; and discuss how these buffers might interact with mobile calcium binding partners to generate characteristic calcium domains. PMID:25750615

  8. On-site Rapid Detection of Trace Non-volatile Inorganic Explosives by Stand-alone Ion Mobility Spectrometry via Acid-enhanced Evaporization

    NASA Astrophysics Data System (ADS)

    Peng, Liying; Hua, Lei; Wang, Weiguo; Zhou, Qinghua; Li, Haiyang

    2014-10-01

    New techniques for the field detection of inorganic improvised explosive devices (IEDs) are urgently developed. Although ion mobility spectrometry (IMS) has been proved to be the most effective method for screening organic explosives, it still faces a major challenge to detect inorganic explosives owing to their low volatilities. Herein, we proposed a strategy for detecting trace inorganic explosives by thermal desorption ion mobility spectrometry (TD-IMS) with sample-to-sample analysis time less than 5 s based on in-situ acidification on the sampling swabs. The responses for typical oxidizers in inorganic explosives, such as KNO3, KClO3 and KClO4 were at least enhanced by a factor of 3000 and their limits of detection were found to be subnanogram. The common organic explosives and their mixtures with inorganic oxidizers were detected, indicating that the acidification process did not affect the detection of organic explosives. Moreover, the typical inorganic explosives such as black powders, firecrackers and match head could be sensitively detected as well. These results demonstrated that this method could be easily employed in the current deployed IMS for on-site sensitive detection of either inorganic explosives or organic ones.

  9. On-site rapid detection of trace non-volatile inorganic explosives by stand-alone ion mobility spectrometry via acid-enhanced evaporization.

    PubMed

    Peng, Liying; Hua, Lei; Wang, Weiguo; Zhou, Qinghua; Li, Haiyang

    2014-01-01

    New techniques for the field detection of inorganic improvised explosive devices (IEDs) are urgently developed. Although ion mobility spectrometry (IMS) has been proved to be the most effective method for screening organic explosives, it still faces a major challenge to detect inorganic explosives owing to their low volatilities. Herein, we proposed a strategy for detecting trace inorganic explosives by thermal desorption ion mobility spectrometry (TD-IMS) with sample-to-sample analysis time less than 5 s based on in-situ acidification on the sampling swabs. The responses for typical oxidizers in inorganic explosives, such as KNO3, KClO3 and KClO4 were at least enhanced by a factor of 3000 and their limits of detection were found to be subnanogram. The common organic explosives and their mixtures with inorganic oxidizers were detected, indicating that the acidification process did not affect the detection of organic explosives. Moreover, the typical inorganic explosives such as black powders, firecrackers and match head could be sensitively detected as well. These results demonstrated that this method could be easily employed in the current deployed IMS for on-site sensitive detection of either inorganic explosives or organic ones. PMID:25318960

  10. On-site Rapid Detection of Trace Non-volatile Inorganic Explosives by Stand-alone Ion Mobility Spectrometry via Acid-enhanced Evaporization

    PubMed Central

    Peng, Liying; Hua, Lei; Wang, Weiguo; Zhou, Qinghua; Li, Haiyang

    2014-01-01

    New techniques for the field detection of inorganic improvised explosive devices (IEDs) are urgently developed. Although ion mobility spectrometry (IMS) has been proved to be the most effective method for screening organic explosives, it still faces a major challenge to detect inorganic explosives owing to their low volatilities. Herein, we proposed a strategy for detecting trace inorganic explosives by thermal desorption ion mobility spectrometry (TD-IMS) with sample-to-sample analysis time less than 5?s based on in-situ acidification on the sampling swabs. The responses for typical oxidizers in inorganic explosives, such as KNO3, KClO3 and KClO4 were at least enhanced by a factor of 3000 and their limits of detection were found to be subnanogram. The common organic explosives and their mixtures with inorganic oxidizers were detected, indicating that the acidification process did not affect the detection of organic explosives. Moreover, the typical inorganic explosives such as black powders, firecrackers and match head could be sensitively detected as well. These results demonstrated that this method could be easily employed in the current deployed IMS for on-site sensitive detection of either inorganic explosives or organic ones. PMID:25318960

  11. Mobile Ambients

    Microsoft Academic Search

    Luca Cardelli; Andrew D. Gordon

    1998-01-01

    There are two distinct areas of work in mobility: mobile computing, concerning computation that is carried out in mobile devices (laptops, personal digital assistants, etc.), and mobile computation, concerning mobile code that moves between devices (applets, agents, etc.). We aim to describe all these aspects of mobility within a single framework that encompasses mobile agents, the ambients where agents interact

  12. Niklas Grip and Gotz E. Pfander Time Varying Narrowband Communications

    E-print Network

    Pfander, Götz

    .1 Mobile phone communications . . . . . . . . . . . . . . . . . . . . . 36 6.2 Satellite communicationsNiklas Grip and G¨otz E. Pfander Time Varying Narrowband Communications Channels: Analysis Communications Channels: Analysis and Implementation1 Niklas Grip Department of Mathematics Lule°a University

  13. Time-Varying Gravitomagnetism

    E-print Network

    Bahram Mashhoon

    2008-03-12

    Time-varying gravitomagnetic fields are considered within the linear post-Newtonian approach to general relativity. A simple model is developed in which the gravitomagnetic field of a localized mass-energy current varies linearly with time. The implications of this temporal variation of the source for the precession of test gyroscopes and the motion of null rays are briefly discussed.

  14. Understanding the behavior of mobile data services consumers

    Microsoft Academic Search

    Se-joon Hong; James Y. L. Thong; Jae-Yun Moon; Kar Yan Tam

    2008-01-01

    Due to rapid advances in the Internet and wireless technologies, a ubiquitous computing world is becoming a reality in the form of mobile computing. At the center of this phenomenon is mobile data services which arise from the convergence of advanced mobile communication technologies with data services. Despite the rapid growth in mobile data services, research into consumers’ usage behavior

  15. Generate secure mobile agent by using SMS to protect Hosts

    Microsoft Academic Search

    Tarig Mohamed Ahmed

    2010-01-01

    No doubt, the usages of mobile agent and mobile phone technologies are rapidly increased. The mobile agent has a promising room in the industry area. Unfortunately, this technology faces some security problems from mobile agents and hosts sides. This paper proposes a new model to protect Hosts (Service Providers) from malicious mobile agents. The main idea behind the model is

  16. The nature of mobile work and the needs for mobile work technology support: A task-technology fit perspective

    Microsoft Academic Search

    Wuping Zheng

    2007-01-01

    The rapid growth in the use of wireless communication and portable devices in recent years has created a great potential for a variety of mobile work technology support. However, we still lack the theories to explore the nature of mobile work, examine the needs for mobile work support, and identify the appropriate mobile technologies for various kinds of mobile work.

  17. Mobile Computing/Mobile Computing/Mobile Computing/Mobile Computing/ Mobile NetworksMobile NetworksMobile NetworksMobile Networks

    E-print Network

    Yu, Chansu

    frequently 8 Mobile IP Overview Goal Mobile wireless computers can attach to the Internet and remain attachedMobile Computing/Mobile Computing/Mobile Computing/Mobile Computing/ Mobile NetworksMobile NetworksMobile NetworksMobile Networks Mobile IP Prof. Chansu Yu 2 Contents IP for Wired Network Mobile IP Overview Basic

  18. Rapid Behavioral Response to Corticosterone Varies with Photoperiod and Dose

    Microsoft Academic Search

    C. W. Breuner; J. C. Wingfield

    2000-01-01

    The magnitude of the adrenocortical response to stress can be modulated by a variety of environmental and physiological factors, such as daylength and body condition. To determine the consequences of this modulation for the organism, one also needs to investigate behavioral sensitivity to glucocorticoids. We examined the behavioral response of Gambel's white-crowned sparrows (Zonotrichia leucophrys gambelii) to elevated glucocorticoids. Using

  19. Inductive instability in electrodynamic systems with rapidly varying parameters

    E-print Network

    Elperin, Tov

    , effective damping resistance of the layered conductors may become negative, although ohmic resistance of its of the boundary, the negative damping resistance can occur when conductivities of the lay- ers decrease. If the rate of inductance decrease L is sufficiently high, the effective damping resistance of the conductor

  20. The Future of Mobile Technology and Mobile Wireless Computing

    ERIC Educational Resources Information Center

    Hart, Jim; Hannan, Mike

    2004-01-01

    It is often stated that mobile wireless computing is going to be the next big technology revolution that will grip the world in the same way mobile telephones did in the 1990s. However, while the technology is rapidly improving, the rate of uptake has been lower than expected. This paper describes some of the reasons for this, and discusses some…

  1. Misbehavior in Mobile Application Markets

    Microsoft Academic Search

    Steven Meyer

    2011-01-01

    Mobile application markets facilitate the distribution of applications and thus help developers advertise their work and customers find useful applications. In addition, the operators of mobile application markets can control the quality and the content of the applications. These markets are growing rapidly with more than 300'000 application in the App Store of Apple and more than 100'000 in the

  2. Varying-{alpha} monopoles

    SciTech Connect

    Menezes, J.; Avelino, P.P.; Santos, C. [Centro de Fisica do Porto e Departamento de Fisica da Faculdade de Ciencias da Universidade do Porto, Rua do Campo Alegre 687, 4169-007, Porto (Portugal)

    2005-11-15

    We study static magnetic monopoles in the context of varying-{alpha} theories and show that there is a group of models for which the 't Hooft-Polyakov solution is still valid. Nevertheless, in general static magnetic monopole solutions in varying-{alpha} theories depart from the classical 't Hooft-Polyakov solution with the electromagnetic energy concentrated inside the core seeding spatial variations of the fine-structure constant. We show that Equivalence Principle constraints impose tight limits on the allowed variations of {alpha} induced by magnetic monopoles which confirms the difficulty to generate significant spatial variation of the fine-structure constant found in previous works. This is true even in the most favorable case where magnetic monopoles are the source for these variations.

  3. Ultra(high)-pressure liquid chromatography-electrospray ionization-time-of-flight-ion mobility-high definition mass spectrometry for the rapid identification and structural characterization of flavonoid glycosides from cauliflower waste.

    PubMed

    Gonzales, Gerard Bryan; Raes, Katleen; Coelus, Sofie; Struijs, Karin; Smagghe, Guy; Van Camp, John

    2014-01-01

    In this paper, a strategy for the detection and structural elucidation of flavonoid glycosides from a complex matrix in a single chromatographic run using U(H)PLC-ESI-IMS-HDMS/MS(E) is presented. This system operates using alternative low and high energy voltages that is able to perform the task of conventional MS/MS in a data-independent way without re-injection of the sample, which saves analytical time. Also, ion mobility separation (IMS) was employed as an additional separation technique for compounds that are co-eluting after U(H)PLC separation. First, the fragmentation of flavonoid standards were analyzed and criteria was set for structural elucidation of flavonoids in a plant extract. Based on retention times, UV spectra, exact mass, and MS fragment characteristics, such as abundances of daughter ions and the presence of radical ions ([Y0-H](-)), a total 19 flavonoid glycosides, of which 8 non-acylated and 11 acylated, were detected and structurally characterized in a cauliflower waste extract. Kaempferol and quercetin were the main aglycones detected while sinapic and ferulic acid were the main phenolic acids. C-glycosides were also found although their structure could not be elucidated. The proposed method can be used as a rapid screening test for flavonoid identification and for routine analysis of plant extracts, such as these derived from cauliflower waste. The study also confirms that agroindustrial wastes, such as cauliflower leaves, could be seen as a valuable source of different bioactive phenolic compounds. PMID:24280615

  4. Mobility management in mobile IP

    Microsoft Academic Search

    Sirisha Medidi; Forouzan Golshani

    2002-01-01

    There is an emerging interest in integrating mobile wireless communication with the Internet based on the Ipv6 technology. Many issues introduced by the mobility of users arise when such an integration is attempted. This paper addresses the problem of mobility management, i.e., that of tracking the current IP addresses of mobile terminals and sustaining active IP connections as mobiles move.

  5. Mobile Multicast in Hierarchical Proxy Mobile IPV6

    NASA Astrophysics Data System (ADS)

    Hafizah Mohd Aman, Azana; Hashim, Aisha Hassan A.; Mustafa, Amin; Abdullah, Khaizuran

    2013-12-01

    Mobile Internet Protocol Version 6 (MIPv6) environments have been developing very rapidly. Many challenges arise with the fast progress of MIPv6 technologies and its environment. Therefore the importance of improving the existing architecture and operations increases. One of the many challenges which need to be addressed is the need for performance improvement to support mobile multicast. Numerous approaches have been proposed to improve mobile multicast performance. This includes Context Transfer Protocol (CXTP), Hierarchical Mobile IPv6 (HMIPv6), Fast Mobile IPv6 (FMIPv6) and Proxy Mobile IPv6 (PMIPv6). This document describes multicast context transfer in hierarchical proxy mobile IPv6 (H-PMIPv6) to provide better multicasting performance in PMIPv6 domain.

  6. Experimental Analysis of AODV & DSR over TCP & CBR Connections with Varying Speed and Node Density in VANET

    E-print Network

    Paul, Bijan; Bikas, Md Abu Naser

    2012-01-01

    Vehicular adhoc network or VANET is special types of adhoc network consists of moving cars referred to as nodes; provide a way to exchange any information between cars without depending on fixed infrastructure. For efficient communication between nodes various routing protocols and mobility models have been proposed based on different scenarios. Due to rapid topology changing and frequent disconnection makes it difficult to select suitable mobility model and routing protocols. Hence performance evaluation and comparison between routing protocols is required to understand any routing protocol as well as to develop a new routing protocol. In this research paper, the performance of two on-demand routing protocols AODV & DSR has been analyzed by means of packet delivery ratio, loss packet ratio & average end-to-end delay with varying speed limit and node density under TCP & CBR connection.

  7. Mobile technology: streamlining practice and improving care.

    PubMed

    Blake, Holly

    2013-09-01

    The use of mobile phones in care delivery has the potential to improve the way in which care is delivered. When implemented effectively, mobile technologies can empower patients and enhance communication between patients and their health-care providers. When barriers are recognised and addressed, mobile technologies can change working lives, facilitating rapid access to information and supporting efficiency in practice. PMID:24005486

  8. Mobile map service with scalable vector graphics

    Microsoft Academic Search

    Wai-yeung Yan

    2004-01-01

    Mobile and wireless technologies have evolved rapidly in recent years, especially the development of hardware devices, such as PDA and Smartphone. Telecommunication service providers, manufacturers, and other developers have launched different kinds of services and applications in these mobile devices. Mobile geographic information system (GIS) and location based service (LBS) appear recently to help people to establish spatial relationship with

  9. Mobility management in mobile IP

    NASA Astrophysics Data System (ADS)

    Medidi, Sirisha; Golshani, Forouzan

    2002-07-01

    There is an emerging interest in integrating mobile wireless communication with the Internet based on the Ipv6 technology. Many issues introduced by the mobility of users arise when such an integration is attempted. This paper addresses the problem of mobility management, i.e., that of tracking the current IP addresses of mobile terminals and sustaining active IP connections as mobiles move. The paper presents some architectural and mobility management options for integrating wireless access to the Internet. We then present performance results for Mobile IPv4, route optimization and Mobile IPv6.

  10. Biomolecule analysis by ion mobility spectrometry.

    PubMed

    Bohrer, Brian C; Merenbloom, Samuel I; Koeniger, Stormy L; Hilderbrand, Amy E; Clemmer, David E

    2008-01-01

    Although nonnative protein conformations, including intermediates along the folding pathway and kinetically trapped misfolded species that disfavor the native state, are rarely isolated in the solution phase, they are often stable in the gas phase, where macromolecular ions from electrospray ionization can exist in varying charge states. Differences in the structures of nonnative conformations in the gas phase are often large enough to allow different shapes and charge states to be separated because of differences in their mobilities through a gas. Moreover, gentle collisional activation can be used to induce structural transformations. These new structures often have different mobilities. Thus, there is the possibility of developing a multidimensional separation that takes advantage of structural differences of multiple stable states. This review discusses how nonnative states differ in the gas phase compared with solution and presents an overview of early attempts to utilize and manipulate structures in order to develop ion mobility spectrometry as a rapid and sensitive technique for separating complex mixtures of biomolecules prior to mass spectrometry. PMID:20636082

  11. Biomolecule Analysis by Ion Mobility Spectrometry

    NASA Astrophysics Data System (ADS)

    Bohrer, Brian C.; Merenbloom, Samuel I.; Koeniger, Stormy L.; Hilderbrand, Amy E.; Clemmer, David E.

    2008-07-01

    Although nonnative protein conformations, including intermediates along the folding pathway and kinetically trapped misfolded species that disfavor the native state, are rarely isolated in the solution phase, they are often stable in the gas phase, where macromolecular ions from electrospray ionization can exist in varying charge states. Differences in the structures of nonnative conformations in the gas phase are often large enough to allow different shapes and charge states to be separated because of differences in their mobilities through a gas. Moreover, gentle collisional activation can be used to induce structural transformations. These new structures often have different mobilities. Thus, there is the possibility of developing a multidimensional separation that takes advantage of structural differences of multiple stable states. This review discusses how nonnative states differ in the gas phase compared with solution and presents an overview of early attempts to utilize and manipulate structures in order to develop ion mobility spectrometry as a rapid and sensitive technique for separating complex mixtures of biomolecules prior to mass spectrometry.

  12. Malware Detection for Mobile Devices Using Software-Defined Networking

    E-print Network

    Wang, Bing

    Malware Detection for Mobile Devices Using Software-Defined Networking Ruofan Jin, Bing Wang: ruofan, bing@engr.uconn.edu Abstract--The rapid adoption of mobile devices comes with the growing prevalence of mobile malware. Mobile malware poses serious threats to personal information and creates

  13. Mobile technologies: a powerful force in home care.

    PubMed

    Silverman, Jeffrey

    2012-10-01

    Mobile and wireless technologies are rapidly changing how home care is delivered and operationalized. "mHealth," or mobile health, in general, refers to healthcare practice that is supported by mobile devices, such as mobile phones, personal digital assistants (PDAs), and other wireless devices. PMID:23213834

  14. Investigating mobile motion prediction in supporting seamless handover for high speed mobile node

    Microsoft Academic Search

    Naimah Yaakob; Farhat Anwar; Zeldi Suryady; Aisha Hassan Abdalla

    2008-01-01

    While witnessing the rapid development in the world of wireless communication, it is highly expected that the next generation of wireless network to be quickly adapt with the high Quality of Service (QoS) requirements and demands from mobile wireless users especially in real time and multimedia applications. Mobile IPv6 has been declared to be unsuitable for managing the mobility of

  15. The Move to Mobile: Where Is a Campus's Place in the Mobile Space?

    ERIC Educational Resources Information Center

    Lum, Lydia

    2012-01-01

    At the end of 2010, for the first time ever, smartphones outsold PCs. Mobile device adoption rates continue to rise rapidly around the world. A recent forecast by Cisco found that global mobile data traffic more than doubled last year, and by the end of 2012, the number of mobile devices in use will outnumber the world's population. In the United…

  16. The Interactive Effects of Pulsed Grazing Disturbance and Patch Size Vary among Wetland Arthropod Guilds

    PubMed Central

    Armitage, Anna R.; Ho, Chuan-Kai; Quigg, Antonietta

    2013-01-01

    Pulse disturbances and habitat patch size can determine community composition independently or in concert, and may be particularly influential on small spatial scales for organisms with low mobility. In a field experiment, we investigated whether the effects of a pulsed disturbance that simulated a grazing event varied with habitat patch size. We focused on the short-term responses of multiple co-occurring emergent salt marsh arthropods with differing levels of mobility and dispersal potential. As part of a marsh restoration project, two types of emergent marsh structures were created: small circular mounds (0.5 m diameter) separated by several meters of aquatic habitat, and larger, elongated terraces (>50 m long). Study plots (0.25 m2) were established on both structures; in a subset of plots, we simulated a pulsed grazing disturbance event by clipping the aboveground tissue of emergent plants, primarily Spartina alterniflora. At the end of the two-month recovery period, Ischnodemus (Hemiptera: Blissidae) density was over 50% lower in disturbed treatments within both large (terrace) and small (mound) patches. Predatory spider treatment responses were similar to Ischnodemus responses, suggesting a trophic relationship between those two arthropod groups. Alternatively, spiders may have been directly affected by the loss of shelter in the disturbed plots. Prokelisia (Homoptera: Delphacidae), which are generally more mobile than Ischnodemus, were not affected by disturbance treatment or by patch size, suggesting the potential for rapid recolonization following disturbance. Larval stem borers decreased by an order of magnitude in disturbed plots, but only in the large patches. In general, the disturbance effects of vegetation removal on arthropod density and community composition were stronger than patch size effects, and there were few interactions between pulsed disturbance and patch size. Rather, emergent marsh arthropod responses to disturbance and habitat area treatments were linked to the dispersal potential and mobility of each individual taxon. PMID:24116133

  17. Mobile marketing

    Microsoft Academic Search

    Fiona Jenkins

    2006-01-01

    Reminds us that mobile phones are ubiquitous and a status symbol for young people, so that more traditional media are getting on the act: Emap publishes a number of teenage magazine brands that have mobile databases and regards mobile marketing as a valuable tool, since messages to an opted-in audience are targeted and relevant. Outlines how this interactive system works:

  18. Rapid Response

    NSDL National Science Digital Library

    Rapid Response, a "knowledge resource specializing in policy advice for developing countries," is a new service from the World Bank. Mainly a fee-based service, the Rapid Response service also contains several valuable free resources. The service concentrates on several areas of expertise including investment climates; private participation in a variety of complex sectors such as telecommunications, water, and energy; and output-based aid. By far, the most useful tool offered on this site is Knowledge Resources, the database of papers, reports, case studies and related Websites. The database is searchable by keyword or by topic or resource type.

  19. Mobile Opportunities, Mobile Problems: Assessing Mobile Commerce Implementation Issues in Malawi

    Microsoft Academic Search

    Edwin Saidi

    The increased usage of mobile phones and the rapid developments in mobile communication technologies present a surge for m-commerce. While m-commerce has been implemented in many countries in both the developed and developing world, it remains an unexploited area in some African countries, including Malawi. This paper investigates the problems that Malawi could face in the implementation of m-commerce and

  20. A Discrete Model for the Efficient Analysis of Time-Varying Narrowband Communication

    E-print Network

    Pfander, Götz

    , satellite communications, underwater sonar communications. The work on this project was supported.1 Mobile phone communications . . . . . . . . . . . . . . . . . . . . . . 32 6.2 Satellite communicationsA Discrete Model for the Efficient Analysis of Time-Varying Narrowband Communication Channels

  1. Rapid Manufacturing

    Microsoft Academic Search

    Bahram Asiabanpour; Alireza Mokhtar; Mahmoud Houshmand

    \\u000a This chapter defines rapid manufacturing (RM) as a technique for manufacturing solid objects by the sequential delivery of\\u000a energy and\\/or material to specified points in space. Current practice is to control the manufacturing process by using a computer-generated\\u000a mathematical model. This chapter compares the large speed and cost advantages of RM to alternative polymer or metal manufacturing\\u000a techniques such as

  2. Determining Students' Readiness for Mobile Learning

    Microsoft Academic Search

    ANNA TRIFONOVA; EVGENIYA GEORGIEVA

    2006-01-01

    Mobile Learning is rather new, but rapidly growing research domain. This paper presents part of a study that we have performed to investigate the university students' readiness to utilize mobile learning. About 600 Italian and 200 Bulgarian students participated in an online questionnaire in June 2005. They were asked about the availability of devices, about their willingness to use m-learning,

  3. Supporting reconfigurable security policies for mobile programs

    Microsoft Academic Search

    Brant Hashii; Scott Malabarba; Raju Pandey; Matt Bishop

    2000-01-01

    Programming models that support code migration have gained prominence, mainly due to a widespread shift from stand-alone to distributed applications. Although appealing in terms of system design and extensibility, mobile programs are a security risk and require strong access control. Further, the mobile code environment is fluid, i.e. the programs and resources located on a host may change rapidly, necessitating

  4. Intrusion Detection Techniques for Mobile Wireless Networks

    Microsoft Academic Search

    Yongguang Zhang; Wenke Lee; Yi-An Huang

    2003-01-01

    The rapid proliferation of wireless networks and mobile computing applications has changed the landscape of network security. The traditional way of protecting networks with firewalls and encryption software is no longer sufficient and effective. We need to search for new architecture and mechanisms to protect the wireless networks and mobile computing application. In this paper, we examine the vulnerabilities of

  5. Intrusion Detection Techniques for Mobile Wireless Networks

    Microsoft Academic Search

    Wenke Lee; Yi-An Huang

    2003-01-01

    The rapid proliferation of wireless networks and mobile computing applications has changed the landscape of network security. The traditional way of protecting networks with rew alls and encryption software is no longer sucien t and eectiv e. We need to search for new architecture and mechanisms to protect the wireless networks and mobile computing application. In this paper, we examine

  6. Design and Implementation of Mobile English Learning

    Microsoft Academic Search

    Shuyun Han; Weiliang Kong; Qingtang Liu; Lian Zhou

    2010-01-01

    With the rapid development of computer and the mobile communication technology, mobile learning arises at the historic moment, which makes people gain learning environment and resources anytime and anywhere. As English has the characters of weak systematic and trivial knowledge, we make a research of the development of resources to provide learners Flake Learning. Firstly, we make a research of

  7. ADOPTION OF MOBILE TECHNOLOGIES FOR CHINESE CONSUMERS

    Microsoft Academic Search

    SuJin Yang; Xinran Lehto

    When it comes to mobile communication technology, China is the largest market in the world. However, due to its rapidly changing economic environment causing disparities between geographical regions, it presents unique marketing problems. In order to attain a better understanding of China as a potentially highly valuable mobile communication technology market, we conducted a survey of 221 Chinese nationals and

  8. The Changing Role of Student Mobility

    ERIC Educational Resources Information Center

    Rivza, Baiba; Teichler, Ulrich

    2007-01-01

    Student mobility often is perceived as a relatively well-documented growth trend of a phenomenon mostly viewed a highly desirable. A closer look, however, suggests that information is shaky in many respects and does not confirm consistent growth according to various criteria and measures. The purposes of mobility vary and also the respective…

  9. Hole mobilities in hydrazone-polycarbonate dispersions

    Microsoft Academic Search

    J. X. Mack; L. B. Schein; A. Peled

    1989-01-01

    Extensive characterization of the hole mobilities mu in dispersions of p-diethylamino- benzaldehyde-diphenyl hydrazone (DEH) in polycarbonate has been carried out. We report the effect of varying the electric field E, temperature T, and spacing between DEH molecules rho on mu. These data are analyzed by a procedure that allows proper separation of the functional dependencies of the mobility on E,

  10. [Lymph mobilization].

    PubMed

    Froneberg, W; Fabian, G

    1989-07-01

    Following a review of the literature lymph mobilization is described. Function and causalities of lymph mobilization and their interactions are explained giving examples and an evaluation of the experience available up to date. In many cases, manual neurotherapy may result in coordination and normalization of disorders which do not respond to other forms of therapy. PMID:2672664

  11. EBSCOhost Mobile

    Microsoft Academic Search

    Ron Burns; Sara Rofofsky Marcus

    2010-01-01

    The explosive growth in mobile technology coupled with widespread adoption among students, librarians, medical professionals, and corporate users means that research database providers need to be where the users are. EBSCO host Mobile was designed and developed to provide EBSCO host database users with a platform that makes the power of EBSCO host and its content highly accessible on the

  12. Performance Testing of Mobile Applications at the Unit Test Level

    Microsoft Academic Search

    Heejin Kim; Byoungju Choi; W. Eric Wong

    2009-01-01

    With the rapid growth of the wireless market and the development of various mobile devices, innovative methods and technologies to produce high-quality mobile applications and reduce time to market have been emerging. Mobile applications are often characterized by an array of limitations such as the short development lifecycle to gain a competitive advantage and difficulties to update once released. Hence,

  13. Mobile marketing research: The-state-of-the-art

    Microsoft Academic Search

    Kaan Varnali; Ay?egül Toker

    2010-01-01

    Rapid proliferation in the business potential of mobile marketing attracts researchers from various fields to contribute to the growing body of knowledge on the phenomena. Although the literature on mobile marketing is accumulating, the stream of research is still in the development stage, hence is highly inconsistent and fragmented. This paper aims to organize and classify the literature on mobile

  14. Identifying website communities in mobile internet based on affinity measurement

    E-print Network

    Ansari, Nirwan

    Identifying website communities in mobile internet based on affinity measurement Jun Liu a Keywords: Website community Graph theory Affinity measurement Degree distribution a b s t r a c t With the rapid development of mobile devices and wireless technologies, mobile internet websites play

  15. Mobile Information Access M. Satyanarayanan

    E-print Network

    . Yet another example involves emergency medical response to a case of poisoning: the responding personnel will need rapid access to medical databases describing poison symptoms and antidotes, as well a tantalizing glimpse of the power of mobile information access. We then examine the major obstacles on the path

  16. A Scanning Frequency Mode for Ion Cyclotron Mobility Spectrometry

    E-print Network

    Clemmer, David E.

    A Scanning Frequency Mode for Ion Cyclotron Mobility Spectrometry Rebecca S. Glaskin, Stephen J A new operational mode for an ion cyclotron mobility spectrometry instrument is explored as a possible-based separation by varying the ion cycle number has substantial analytical utility. Ion mobility spectrometry (IMS

  17. User needs for location-aware mobile services

    Microsoft Academic Search

    Eija Kaasinen

    2003-01-01

    ?Mobile contexts of use vary a lot, and may even be continuously changing during use. The context is much more than location, but its other elements are still difficult to identify or measure. Location information is becoming an integral part of different mobile devices. Current mobile services can be enhanced with location-aware features, thus providing the user with a smooth

  18. Designing for the evolution of mobile contacts application

    Microsoft Academic Search

    Younghee Jung; Akseli Anttila; Jan Blom

    2008-01-01

    We describe the design drivers, prototype and one-month field study results of a mobile contacts application incorporating new features and design elements. The design was inspired by 8 hypotheses on the potential new uses of a mobile contacts application. A total of 16 users from varying age groups and prior experiences with mobile phones participated in the trial of a

  19. Microbial influence on metal mobility and application for bioremediation

    Microsoft Academic Search

    Geoffrey M. Gadd

    2004-01-01

    Microorganisms are intimately involved in metal biogeochemistry with a variety of processes determining mobility, and therefore, bioavailability. The balance between mobilization and immobilization varies depending on the organisms involved, their environment and physicochemical conditions. Metal mobilization can arise from a variety of leaching mechanisms, complexation by metabolites and siderophores, and methylation, where this results in volatilization. Immobilization can result from

  20. Rapid Airplane Parametric Input Design (RAPID)

    NASA Technical Reports Server (NTRS)

    Smith, Robert E.

    1995-01-01

    RAPID is a methodology and software system to define a class of airplane configurations and directly evaluate surface grids, volume grids, and grid sensitivity on and about the configurations. A distinguishing characteristic which separates RAPID from other airplane surface modellers is that the output grids and grid sensitivity are directly applicable in CFD analysis. A small set of design parameters and grid control parameters govern the process which is incorporated into interactive software for 'real time' visual analysis and into batch software for the application of optimization technology. The computed surface grids and volume grids are suitable for a wide range of Computational Fluid Dynamics (CFD) simulation. The general airplane configuration has wing, fuselage, horizontal tail, and vertical tail components. The double-delta wing and tail components are manifested by solving a fourth order partial differential equation (PDE) subject to Dirichlet and Neumann boundary conditions. The design parameters are incorporated into the boundary conditions and therefore govern the shapes of the surfaces. The PDE solution yields a smooth transition between boundaries. Surface grids suitable for CFD calculation are created by establishing an H-type topology about the configuration and incorporating grid spacing functions in the PDE equation for the lifting components and the fuselage definition equations. User specified grid parameters govern the location and degree of grid concentration. A two-block volume grid about a configuration is calculated using the Control Point Form (CPF) technique. The interactive software, which runs on Silicon Graphics IRIS workstations, allows design parameters to be continuously varied and the resulting surface grid to be observed in real time. The batch software computes both the surface and volume grids and also computes the sensitivity of the output grid with respect to the input design parameters by applying the precompiler tool ADIFOR to the grid generation program. The output of ADIFOR is a new source code containing the old code plus expressions for derivatives of specified dependent variables (grid coordinates) with respect to specified independent variables (design parameters). The RAPID methodology and software provide a means of rapidly defining numerical prototypes, grids, and grid sensitivity of a class of airplane configurations. This technology and software is highly useful for CFD research for preliminary design and optimization processes.

  1. Mobile IPMobile IP Mobile IPMobile IP

    E-print Network

    Yeom, Ikjun

    Mobile IPMobile IP #12;2 Mobile IPMobile IP · How do we support mobile users whose point of attachment to the network changes dynamically? #12;3 Mobile IPMobile IP · The goal of Mobile IP is to allow connectivity automatically, despite the change. · While Mobile IP can work with wired connections, where you

  2. Strategic analysis of mobile viral marketing through a holistic study in technological evolution of mobile devices

    E-print Network

    Surya, Yulia

    2009-01-01

    Rapid advancement in Electronic Communication gives rise to the popularity of Viral Marketing. Mobile Communication, in particular, offers greater potential in the utilization of this Word-of-Mouth phenomenon as a Marketing ...

  3. SVM-based spectrum mobility prediction scheme in mobile cognitive radio networks.

    PubMed

    Wang, Yao; Zhang, Zhongzhao; Ma, Lin; Chen, Jiamei

    2014-01-01

    Spectrum mobility as an essential issue has not been fully investigated in mobile cognitive radio networks (CRNs). In this paper, a novel support vector machine based spectrum mobility prediction (SVM-SMP) scheme is presented considering time-varying and space-varying characteristics simultaneously in mobile CRNs. The mobility of cognitive users (CUs) and the working activities of primary users (PUs) are analyzed in theory. And a joint feature vector extraction (JFVE) method is proposed based on the theoretical analysis. Then spectrum mobility prediction is executed through the classification of SVM with a fast convergence speed. Numerical results validate that SVM-SMP gains better short-time prediction accuracy rate and miss prediction rate performance than the two algorithms just depending on the location and speed information. Additionally, a rational parameter design can remedy the prediction performance degradation caused by high speed SUs with strong randomness movements. PMID:25143975

  4. SVM-Based Spectrum Mobility Prediction Scheme in Mobile Cognitive Radio Networks

    PubMed Central

    Zhang, Zhongzhao; Ma, Lin; Chen, Jiamei

    2014-01-01

    Spectrum mobility as an essential issue has not been fully investigated in mobile cognitive radio networks (CRNs). In this paper, a novel support vector machine based spectrum mobility prediction (SVM-SMP) scheme is presented considering time-varying and space-varying characteristics simultaneously in mobile CRNs. The mobility of cognitive users (CUs) and the working activities of primary users (PUs) are analyzed in theory. And a joint feature vector extraction (JFVE) method is proposed based on the theoretical analysis. Then spectrum mobility prediction is executed through the classification of SVM with a fast convergence speed. Numerical results validate that SVM-SMP gains better short-time prediction accuracy rate and miss prediction rate performance than the two algorithms just depending on the location and speed information. Additionally, a rational parameter design can remedy the prediction performance degradation caused by high speed SUs with strong randomness movements. PMID:25143975

  5. Predictable mobility

    E-print Network

    Iagnemma, Karl

    In this article, a statistical mobility prediction for planetary surface exploration rovers has been described. This method explicitly considers uncertainty of the terrain physical parameters via SRSM and employs models ...

  6. Mobile cinema

    E-print Network

    Pan, Pengkai, 1972-

    2004-01-01

    This thesis develops techniques and methods that extend the art and craft of storytelling, and in particular enable the creation of mobile cinema. Stories are always constrained by the medium in which they are told and the ...

  7. Are Mobile Payment and Banking the Killer Apps for Mobile Commerce?

    Microsoft Academic Search

    Xiangpei Hu; Wenli Li; Qing Hu

    2008-01-01

    Mobile commerce had been expected to become a major force of e-commerce in the 21st century. However, the rhetoric has far exceeded the reality so far. While academics and practitioners have presented many views about the lack of rapid growth of mobile commerce, we submit that the anticipated mobile commerce take-off hinges on the emergence of a few killer apps.

  8. A smart card-based secure software distribution scheme for mobile application market

    Microsoft Academic Search

    Ya-Jun Fan; Qiao-Yan Wen

    2012-01-01

    Nowadays, with the rapid development of the wireless mobile networks and the related technologies, the range of interpersonal collaboration and communication has been expanded to almost all corners of the world. And the applications in the mobile application markets greatly enrich the functions of mobile devices in wireless mobile networks. In general, the applications with collaborative functions require the secure

  9. Quality of multimedia streaming-oriented handover management solution for mobile applications

    Microsoft Academic Search

    Bogdan Ciubotaru; Gabriel-Miro Muntean

    2009-01-01

    Mobility has become a mandatory feature of the future Internet as mobile computing gains increasing popularity among Internet users. The rapidly evolving heterogeneous wireless environment provides a variety of communication resources for the mobile host. In order to fully benefit of these wireless access networks an efficient and quality oriented mobility management system has to be employed. This paper presents

  10. Topobathymetric model of Mobile Bay, Alabama

    USGS Publications Warehouse

    Danielson, Jeffrey J.; Brock, John C.; Howard, Daniel M.; Gesch, Dean B.; Bonisteel-Cormier, Jamie M.; Travers, Laurinda J.

    2013-01-01

    Topobathymetric Digital Elevation Models (DEMs) are a merged rendering of both topography (land elevation) and bathymetry (water depth) that provides a seamless elevation product useful for inundation mapping, as well as for other earth science applications, such as the development of sediment-transport, sea-level rise, and storm-surge models. This 1/9-arc-second (approximately 3 meters) resolution model of Mobile Bay, Alabama was developed using multiple topographic and bathymetric datasets, collected on different dates. The topographic data were obtained primarily from the U.S. Geological Survey (USGS) National Elevation Dataset (NED) (http://ned.usgs.gov/) at 1/9-arc-second resolution; USGS Experimental Advanced Airborne Research Lidar (EAARL) data (2 meters) (http://pubs.usgs.gov/ds/400/); and topographic lidar data (2 meters) and Compact Hydrographic Airborne Rapid Total Survey (CHARTS) lidar data (2 meters) from the U.S. Army Corps of Engineers (USACE) (http://www.csc.noaa.gov/digitalcoast/data/coastallidar/). Bathymetry was derived from digital soundings obtained from the National Oceanic and Atmospheric Administration’s (NOAA) National Geophysical Data Center (NGDC) (http://www.ngdc.noaa.gov/mgg/geodas/geodas.html) and from water-penetrating lidar sources, such as EAARL and CHARTS. Mobile Bay is ecologically important as it is the fourth largest estuary in the United States. The Mobile and Tensaw Rivers drain into the bay at the northern end with the bay emptying into the Gulf of Mexico at the southern end. Dauphin Island (a barrier island) and the Fort Morgan Peninsula form the mouth of Mobile Bay. Mobile Bay is 31 miles (50 kilometers) long by a maximum width of 24 miles (39 kilometers) with a total area of 413 square miles (1,070 square kilometers). The vertical datum of the Mobile Bay topobathymetric model is the North American Vertical Datum of 1988 (NAVD 88). All the topographic datasets were originally referenced to NAVD 88 and no transformations were made to these input data. The NGDC hydrographic, multibeam, and trackline surveys were transformed from mean low water (MLW) or mean lower low water (MLLW) to NAVD 88 using VDatum (http://vdatum.noaa.gov). VDatum is a tool developed by the National Geodetic Survey (NGS) that performs transformations among tidal, ellipsoid-based, geoid-based, and orthometric datums using calibrated hydrodynamic models. The vertical accuracy of the input topographic data varied depending on the input source. Because the input elevation data were derived primarily from lidar, the vertical accuracy ranges from 6 to 20 centimeters in root mean square error (RMSE). he horizontal datum of the Mobile Bay topobathymetric model is the North American Datum of 1983 (NAD 83), geographic coordinates. All the topographic and bathymetric datasets were originally referenced to NAD 83, and no transformations were made to the input data. The bathymetric surveys were downloaded referenced to NAD 83 geographic, and therefore no horizontal transformations were required. The topbathymetric model of Mobile Bay and detailed metadata can be obtained from the USGS Web sites: http://nationalmap.gov/.

  11. The Effect of Mobile IP Handoffs on the Performance of TCP

    Microsoft Academic Search

    Anne Fladenmuller; Ranil De Silva

    1999-01-01

    Mobile IP is a standard for handling routing for hosts that have moved from their home network. This paper studies the costs of the Mobile IP handoff that occurs when a mobile host moves between networks. Experiments were carried out with Mobile IP and TCP over varying network conditions to observe the effect of handoffs on the transmission. This paper

  12. Rapid Diagnosis of Malaria

    PubMed Central

    Murray, Clinton K.; Bennett, Jason W.

    2009-01-01

    Malaria's global impact is expansive and includes the extremes of the healthcare system ranging from international travelers returning to nonendemic regions with tertiary referral medical care to residents in hyperendemic regions without access to medical care. Implementation of prompt and accurate diagnosis is needed to curb the expanding global impact of malaria associated with ever-increasing antimalarial drug resistance. Traditionally, malaria is diagnosed using clinical criteria and/or light microscopy even though both strategies are clearly inadequate in many healthcare settings. Hand held immunochromatographic rapid diagnostic tests (RDTs) have been recognized as an ideal alternative method for diagnosing malaria. Numerous malaria RDTs have been developed and are widely available; however, an assortment of issues related to these products have become apparent. This review provides a summary of RDT including effectiveness and strategies to select the ideal RDT in varying healthcare settings. PMID:19547702

  13. Best effort QoS support routing in mobile ad hoc networks 

    E-print Network

    Luo, Heng

    2012-06-25

    In the past decades, mobile traffic generated by devices such as smartphones, iphones, laptops and mobile gateways has been growing rapidly. While traditional direct connection techniques evolve to provide better access ...

  14. Platform leadership through system interfaces : a study of application programming interfaces for mobile operating systems

    E-print Network

    Mandala, Ashok Chakravarthy

    2007-01-01

    The Smart Mobile device industry is witnessing rapid growth with the increased convergence of voice-centric mobile phones and data-centric personal digital assistant systems. Improving capabilities in device hardware have ...

  15. Quality of Service (QoS) security in mobile ad hoc networks 

    E-print Network

    Lu, Bin

    2006-10-30

    With the rapid proliferation of wireless networks and mobile computing applications, Quality of Service (QoS) for mobile ad hoc networks (MANETs) has received increased attention. Security is a critical aspect of QoS ...

  16. Mobile Homophily and Social Location Prediction

    E-print Network

    Bapierre, Halgurt; Groh, Georg

    2015-01-01

    The mobility behavior of human beings is predictable to a varying degree e.g. depending on the traits of their personality such as the trait extraversion - introversion: the mobility of introvert users may be more dominated by routines and habitual movement patterns, resulting in a more predictable mobility behavior on the basis of their own location history while, in contrast, extrovert users get about a lot and are explorative by nature, which may hamper the prediction of their mobility. However, socially more active and extrovert users meet more people and share information, experiences, believes, thoughts etc. with others. which in turn leads to a high interdependency between their mobility and social lives. Using a large LBSN dataset, his paper investigates the interdependency between human mobility and social proximity, the influence of social networks on enhancing location prediction of an individual and the transmission of social trends/influences within social networks.

  17. Assessment of soil health and fertility indicators with mobile phone imagery

    NASA Astrophysics Data System (ADS)

    Aitkenhead, Matt; Gwatkin, Richard; Coull, Malcolm; Donnelly, David

    2015-04-01

    Work on rapid soil assessment in the field has led to many hand-held sensors for soil monitoring (e.g. NIR, FTIR, XRF). Recent work by a research team at the James Hutton Institute has led to an integrated framework of mobile phones, apps and server-side processing. One example of this is the SOCIT app for estimating soil organic matter and carbon using geolocated mobile phone camera imagery. The SOCIT app is only applicable for agricultural soils in Scotland, and our intention is to expand this work both geographically and in functional ability. Ongoing work for the development of a prototype app for estimating soil characteristics across Europe using mobile phone imagery and the JRC LUCAS dataset will be described. Additionally, we will demonstrate recent work in estimating a number of soil health indicators from more detailed analysis of soil photographs. Accuracy levels achieved for estimating soil organic matter and organic carbon content, pH, structure, cation exchange capacity and texture vary and are not as good as those achieved with laboratory analysis, but are suitable for rapid field-based assessment. Issues relating to this work include colour stabilisation and calibration, integration with data on site characteristics, data processing, model development and the ethical use of data captured by others, and each of these topics will also be discussed.

  18. Mars Mobiles

    NSDL National Science Digital Library

    This activity introduces students to the basic features of the Mars landscape. Students locate the planets of the solar system on a diagram; look at pictures of Mars and describe the Martian landscape; describe landscape features of Earth, and compare those to what is found on Mars; and make mobiles showing features of the Martian landscape.

  19. Mobility of Protozoa through Narrow Channels

    PubMed Central

    Wang, Wei; Shor, Leslie M.; LeBoeuf, Eugene J.; Wikswo, John P.; Kosson, David S.

    2005-01-01

    Microbes in the environment are profoundly affected by chemical and physical heterogeneities occurring on a spatial scale of millimeters to micrometers. Physical refuges are critical for maintaining stable bacterial populations in the presence of high predation pressure by protozoa. The effects of microscale heterogeneity, however, are difficult to replicate and observe using conventional experimental techniques. The objective of this research was to investigate the effect of spatial constraints on the mobility of six species of marine protozoa. Microfluidic devices were created with small channels similar in size to pore spaces in soil or sediment systems. Individuals from each species of protozoa tested were able to rapidly discover and move within these channels. The time required for locating the channel entrance from the source well increased with protozoan size and decreased with channel height. Protozoa of every species were able to pass constrictions with dimensions equal to or smaller than the individual's unconstrained cross-sectional area. Channel geometry was also an important factor affecting protozoan mobility. Linear rates of motion for various species of protozoa varied by channel size. In relatively wide channels, typical rates of motion were 300 to 500 ?m s?1 (or about 1 m per hour). As the channel dimensions decreased, however, motilities slowed more than an order of magnitude to 20 ?m s?1. Protozoa were consistently observed to exhibit several strategies for successfully traversing channel reductions. The empirical results and qualitative observations resulting from this research help define the physical limitations on protozoan grazing, a critical process affecting microbes in the environment. PMID:16085857

  20. Circuit Design of DRAM for Mobile Generation

    Microsoft Academic Search

    Jae-Yoon Sim

    2007-01-01

    In recent few years, low-power electronics has been a leading drive for technology developments nourished by rapidly growing market share. Mobile DRAM, as a fundamental block of hand-held devices, is now becoming a product developed by limitless competition. To support application specific mobile features, various new power-reduction schemes have been proposed and adopted by standardization. Tightened power budget in battery-operated

  1. MOTA: engineering an operator agnostic mobile service

    Microsoft Academic Search

    Supratim Deb; Kanthi Nagaraj; Vikram Srinivasan

    2011-01-01

    There are two emerging trends in the mobile data world. First, mobile data is exploding at a rapid rate with analysts predicting 25-50X growth by the year 2015. The second trend is that users are demanding greater degree of flexibility in selecting their operators at fine timescales. Across Asia, dual-SIM phones have become popular, while Apple is rumored to be

  2. Mobile ultrasound with DICOM and cloud connectivity

    Microsoft Academic Search

    Chia-Chi Teng; Carter Green; Rob Johnson; Paul Jones; Craig Treasure

    2012-01-01

    The market for cloud-based mobile application is growing rapidly, according to recent industry research. Healthcare services are positively affected by the new technologies and availability of many e-health applications. Diagnostic medical imaging is one area where emerging systems are being developed to leverage the mobile-cloud infrastructure to increase the accessibility and lower the cost of these critical services. A framework

  3. Multimedia modeling of autonomous mobile robots

    NASA Astrophysics Data System (ADS)

    Zada, Fatma; Guirguis, S.

    1997-09-01

    Modeling of autonomous mobile robots (AMRs) is sought to enable the designers to investigate various aspects of the design before the actual implementation takes place. Simulation techniques are undoubtedly enriching the design tools, by which the designer would be able to vary the design parameters as appropriate until achieving some optimal performance point. Although they are general purpose, multimedia tools, especially authoring tools, can give the AMR designer some degree of assistance in fulfilling his simulation task as fast as possible. This rapid prototyping tool is rather cost effective, and allow the designer to interactively manipulate his design in simple steps. In this paper, a multimedia environment has been constructed to enable designers to simulate AMRs in order to investigate aspects concerning their kinematics and dynamics. It is also sought that these design experiences can be gathered and categorized in a tutoring system that could be used by practitioners and students enrolled in highly technical courses such as robotics. The rich multimedia environment can assist the learner in so many ways by devising examples, suggesting solutions and design tradeoffs that have been experienced before.

  4. Theoretical Mobility Analysis of Ion Mobility Spectrometry

    E-print Network

    Collins, Gary S.

    Results Theoretical Mobility Analysis of Ion Mobility Spectrometry Objective The purpose run and reduced mobility constants of ions were found in the noble gases at a constant temperature of both the ion and drift gas were then manipulated to explore the relationship between mass and mobility

  5. Note: Integration of trapped ion mobility spectrometry with mass spectrometry

    PubMed Central

    Fernandez-Lima, F. A.; Kaplan, D. A.; Park, M. A.

    2011-01-01

    The integration of a trapped ion mobility spectrometer (TIMS) with a mass spectrometer (MS) for complementary fast, gas-phase mobility separation prior to mass analysis (TIMS-MS) is described. The ion transmission and mobility separation are discussed as a function of the ion source condition, bath gas velocity, analysis scan speed, RF ion confinement, and downstream ion optical conditions. TIMS mobility resolution depends on the analysis scan speed and the bath gas velocity, with the unique advantage that the IMS separation can be easily tuned from high speed (?25 ms) for rapid analysis to slower scans for higher mobility resolution (R > 80). PMID:22225261

  6. Going mobile

    NASA Astrophysics Data System (ADS)

    Brus, Eric

    1987-12-01

    By 1990, all metropolitan areas in the U.S. and rural areas close to major cities or towns are expected to have cellular telephone service; 22 Canadian cities also feature cellular service. To supply mobile telecommunication services to sparsely-populated rural areas, a mobile satellite service (MSS) is now being developed. In this paper the projected possibilities of the MSS system are discussed, including a possibility that a piggyback-MSS payload be added to the GSTAR-4 satellite which is scheduled for a launch in 1988 or 1989; one in which some of the hardware from aborted direct-broadcast satellites would be used; and the possibility of building a new MSS satellite with large servicing capacity. Canada is planning to launch its own mobile satellite, MSAT, in the early 1990s. The MSS is expected to be 'generic', serving not only people on land but maritime and aeronautical users as well. It will also offer major benefits to truck and automobile drivers, making it possible for them to conduct business or to call for assistance from locations beyond the range of cellular systems.

  7. Continuously Connected With Mobile IP

    NASA Technical Reports Server (NTRS)

    2002-01-01

    Cisco Systems developed Cisco Mobile Networks, making IP devices mobile. With this innovation, a Cisco router and its connected IP devices can roam across network boundaries and connection types. Because a mobile user is able to keep the same IP address while roaming, a live IP connection can be maintained without interruption. Glenn Research Center jointly tested the technology with Cisco, and is working to use it on low-earth-orbiting research craft. With Cisco's Mobile Networks functionality now available in Cisco IOS Software release 12.2(4)T, the commercial advantages and benefits are numerous. The technology can be applied to public safety, military/homeland security, emergency management services, railroad and shipping systems, and the automotive industry. It will allow ambulances, police, firemen, and the U.S. Coast Guard to stay connected to their networks while on the move. In the wireless battlefield, the technology will provide rapid infrastructure deployment for U.S. national defense. Airline, train, and cruise passengers utilizing Cisco Mobile Networks can fly all around the world with a continuous Internet connection. Cisco IOS(R) Software is a registered trademark of Cisco Systems.

  8. Browsing as the killer app: Explaining the rapid success of Apple's iPhone

    Microsoft Academic Search

    Joel West; Michael Mace

    2010-01-01

    Since the mid-1990s, the mobile phone industry has sought widespread adoption of mobile data services, envisioning a new “mobile Internet” with its own complex value network delivered through smartphone terminals. With its iPhone, Apple rapidly gained smartphone market share while spurring widespread adoption of mobile data services in the United States.Here it is argued that the success of the iPhone

  9. Provable and practical location privacy for vehicular and mobile systems

    E-print Network

    Popa, Raluca Ada

    2010-01-01

    In recent years, there has been a rapid evolution of location-based vehicular and mobile services (e.g., electronic tolling, congestion pricing, traffic statistics, insurance pricing, location-based social applications), ...

  10. Strategic analysis of mobile money ventures in Developing countries

    E-print Network

    Caballero, Luis (Luis Alberto Caballero Parra)

    2012-01-01

    Mobile money services are spreading rapidly in many developed and developing countries across the world. Whereas in developed economies these new services are seen as a way to make current services more functional and ...

  11. Development of a mobile research flight test support capability

    NASA Technical Reports Server (NTRS)

    Rhea, Donald C.; Moore, Archie L.

    1988-01-01

    This paper presents the approach taken by the NASA Western Aeronautical Test Range (WATR) of the Ames Research Center (ARC) to develop and utilize mobile systems to satisfy unique real-time research flight test requirements of research projects such as the advanced fighter technology integration (AFTI) F-16, YAV-8B Harrier, F-18 high-alpha research vehicle (HARV), XV-15, and the UH-60 Black Hawk. The approach taken is cost-effective, staff efficient, technologically current, and provides a safe and effective research flight test environment to support a highly complex set of real-time requirements including the areas of tracking and data acquisition, communications (audio and video) and real-time processing and display, postmission processing, and command uplink. The development of this capability has been in response to the need for rapid deployment at varied site locations with full real-time comutation and display capability. This paper will discuss the requirements, implementation and growth plan for mobile systems development within the NASA Western Aeronautical Test Range.

  12. Development of a mobile research flight test support capability

    NASA Technical Reports Server (NTRS)

    Rhea, Donald C.; Moore, Archie L.

    1988-01-01

    This paper presents the approach taken by the NASA Western Aeronautical Test Range (WATR) of the Ames Research Center to develop and utilize mobile systems to satisfy unique real-time research flight test requirements of research projects such as the advanced fighter technology integration (AFTI)F-16, YAV-8B Harrier, F-18 high-alpha research vehicle (HARV), XV-15, and the UH-60 Black Hawk. The approach taken is cost-effective, staff efficient, technologically current, and provides a safe and effective research flight test environment to support a highly complex set of real-time requirements including the areas of tracking and data acquisition, communications (audio and video) and real-time processing and display, postmission processing, and command uplink. The development of this capability has been in response to the need for rapid deployment at varied site locations with full real-time computations and display capability. This paper will discuss the requirements, implementation and growth plan for mobile systems development within the NASA Western Aeronautical Test Range.

  13. Time varying velocity of light

    E-print Network

    Tiwari, S C

    2002-01-01

    Recently there has been a lot of intersest in the superluminal phenomena, and time varying velocity of light cosmological models. More than two decades ago at Einstein centenary symposium, Nagpur I had put forward space-time interaction hypothesis. One of its predictions was that velocity of light decreased with the age of Universe. In view of the profoundness of the hypothesis the original paper is reproduced here. We also mention that in a paper "Quasars, Tachyons and the early universe" proc. Einstein found. Intnl. 2(3), 1985 pp 69-75, it was suggested that, "The boundary region of the universe being the source of radiation, the slowing down of the speed of radiation from $4.4 \\times 10^{10}$ cm/sec at $t_A = 10^{10}$ yrs. to the present value of $3 \\times 10^{10}$ cm/sec should show up as a large red shifts. The successive boundary region radiations at various epoch will give rise to a wide range of red shifts. Therefore, defining quasars as the objects having two properties: large red shifts and powerful...

  14. Local varying-alpha theories

    NASA Astrophysics Data System (ADS)

    2015-06-01

    In a recent paper, we demonstrated how the simplest model for varying-alpha may be interpreted as the effect of a dielectric material, generalized to be consistent with Lorentz invariance. Unlike normal dielectrics, such a medium cannot change the speed of light, and its dynamics obey a Klein-Gordon equation. This work immediately suggests an extension of the standard theory, even if we require compliance with Lorentz invariance. Instead of a wave equation, the dynamics may satisfy a local algebraic relation involving the permittivity and the properties of the electromagnetic (EM) field, in analogy with more conventional dielectric (but still preserving Lorentz invariance). We develop the formalism for such theories and investigate some phenomenological implications. The problem of the divergence of the classical self-energy can be solved, or at least softened, in this framework. Some interesting new cosmological solutions for the very early universe are found, including the possibility of a bounce, inflation and expansion with a loitering phase, all of which are induced by early variations in alpha.

  15. People On The Move: Some Thoughts On Human Dispersal In Relation To Rapid Climatic Change

    NASA Astrophysics Data System (ADS)

    Davies, W.

    It is still generally assumed that the default situation for past humans must have been to be sedentary. That is to say, given a chance people would have settled in one area (with a good supply of resources) and established clearly-defined territories. Such concepts presuppose that much of human existence was conducted in climatic conditions sim- ilar to the relatively stable ones seen in the Holocene. What effects do rapid climatic fluctuations have upon environmental carrying capacity, and thus upon human mobil- ity and exploitation patterns? Such an approach could be called 'non-analogue', as it does not seek to impose [current] Holocene patterns upon the Pleistocene, in the same way that 'non-analogue' animal and plant communities are now routinely described for the same period. If one adopts non-analogue perspectives, perhaps one could also argue that in many cases mobility was the rule and not the exception. Turning the conventional wisdom around, we can ask why people should remain in an area. What are the characteristics of that area which could have encouraged people to become less mobile? I do not argue that all groups were mobile: some cannot have been, and not every member of other groups would have been equally mobile (differentiation on grounds of age and sex). In addition, mobility patterns must also have varied over time, although we should not necessarily expect a discernible linear trend either towards or away from greater mobility, because such behaviour operates within a climatic and environmental framework as well as a socio-economic one. If climate oscillated rapidly, it is feasible to suggest that such fluctuations affected environmental stability and thus carrying capacity. The resource species present and their availability would therefore affect the possibilities for human mobility. When discussing the possibilities for human dispersal into new regions, we essentially have a choice between two competing models: the Wave of Advance (sensu Boserup, Cavalli-Svorza &Ammermann) or Directional dispersal. The former model posits a slow, group-fission-based dispersal across the landscape, driven by 'push' factors such as population pressure. We should not expect resources to be evenly-distributed across the landscape, and thus if one adopts a Wave of Advance interpretation, one would have to consider the possibility of rapid, directional jumps between favoured resource 1 patches, seriously damaging the model's viability. On the other hand, Directional dis- persal models expect more focused movement, with certain ecotones (such as rivers or coasts) being preferred, and are driven more by 'pull' factors which draw people across the landscape relatively rapidly. In the latter model, 'infill' occupation between the initially occupied areas can occur if demanded by socio-economic requirements of the group[s]. This paper will explore all these issues, and discuss how we might identify and test them in the archaeological record, and set them in the climatic context. The effects of climatic factors on past human behaviour have to be qualified or discounted before we can really start to discuss social or 'cultural' explanations. 2

  16. Predictive LocationBased QoS Routing in Mobile Ad Hoc Networks Samarth H. Shah and Klara Nahrstedt

    E-print Network

    Predictive Location­Based QoS Routing in Mobile Ad Hoc Networks Samarth H. Shah and Klara Nahrstedt Abstract--- In mobile ad hoc networks, the locations and resource­richness of mobile nodes vary dynamically. The infor­ mation used for routing by traditional routing protocols becomes obsolete due to node mobility

  17. Rapid thermal oxidation of zinc nitride film

    NASA Astrophysics Data System (ADS)

    Lin, Chiung-Wei; Song, Yue-Pu; Chang, Shih-Chieh

    2015-04-01

    In this work, a zinc nitride (ZnN) film was deposited at room temperature and subjected to pulse-mode rapid thermal oxidation. The physical and chemical structures of ZnN film were changed during the rapid thermal oxidation process. The presence of zinc-oxygen bonds in the oxidized ZnN film indicated that some nitrogen atoms within the ZnN film are replaced by oxygen atoms. Through the rapid thermal oxidation process, ZnN was converted into a zinc oxide material containing nitrogen atoms. The oxidized ZnN possessed more acceptor states than donor states, which resulted in p-type conduction. The carrier concentration, mobility, and resistivity of the rapid-thermal-oxidized ZnN were 6.49 × 1018 cm?3, 12.9 cm2 V?1 s?1 and 0.7 ? cm, respectively.

  18. Experience from Mobile Application Service Framework in WIP

    Microsoft Academic Search

    Shinyoung Lim; Youjin Song

    2002-01-01

    As there is a rapid growth of service market and technologies of mobile applications, many kinds of platforms, service, business\\u000a models, devices, and requirements for mobile business service are under consideration. In case of Korea, it has been experienced\\u000a for years in applying mobile application service to the real world. In technical domain, one of the hot issues in development

  19. Distributed PIN Verification Scheme for Improving Security of Mobile Devices

    Microsoft Academic Search

    Jian Tang; Vagan Terziyan; Jari Veijalainen

    2003-01-01

    The main driving force for the rapid acceptance rate of small sized mobile devices is the capability to perform e-commerce transactions at any time and at any place, especially while on the move. There are, however, also weaknesses of this type of e-commerce, often called mobile e-commerce, or m-commerce. Due to their small size and easy portability mobile devices can

  20. A cloud based SIM DRM scheme for the mobile internet

    Microsoft Academic Search

    Peng Zou; Chaokun Wang; Zhang Liu; Jianmin Wang; Jia-Guang Sun

    2010-01-01

    With the rapid growth of the mobile industry, a considerable amount of mobile applications and services are available. Meanwhile, pirates and illegal distributions of digital contents have become serious issues. Digital Rights Management (DRM) aims at protecting digital contents from being abused through regulating the usage of digital contents. In this paper, a cloud based SIM DRM scheme, called CS-DRM,

  1. A Novel Design of Mobile IM System with Network Management

    Microsoft Academic Search

    Yunxiang Gao; Chuangbai Xiao; Chaoqin Gao; Huiguang Chen

    2009-01-01

    With mobile terminals and wireless network environment constantly being improved, people are using mobile instant messaging (IM) products more frequently. We provide a novel design based on Jabber and FCAPS model to meet the rapidly growing and changing needs. Jabber provides an open, secure, real-time communication technology. Network management has always been a key aspect of communication networks. It is

  2. Keys for growth in Japan's mature mobile market

    E-print Network

    Oto, Hiroyuki

    2005-01-01

    The objective of this thesis is to identify key factors that will produce further growth for NTT DoCoMo in Japan's mature mobile market. Since the early 1990s, the mobile phone market in Japan has grown rapidly, and ...

  3. Personalized Intelligent Mobile Learning System for Supporting Effective English Learning

    ERIC Educational Resources Information Center

    Chen, Chih-Ming; Hsu, Shih-Hsun

    2008-01-01

    Since English has been an international language, how to enhance English levels of people by useful computer assisted learning forms or tools is a critical issue in non-English speaking countries because it definitely affects the overall competition ability of a country. With the rapid growth of wireless and mobile technologies, the mobile

  4. Semantic Analysis and Personalization for Mobile Media Applications

    Microsoft Academic Search

    Changsheng Xu; Qi Tian

    2007-01-01

    The explosive proliferation of multimedia content leads to an increasing need for its ubiquitous access, anytime and anywhere, and over a wide variety of receiving devices. Mobile media is a high growth area due to rich multimedia content and rapidly increased number of portable multimedia players. However, current consumer expectations for mobile media technologies and applications still far exceed the

  5. Secure cash withdrawal through mobile phone\\/device

    Microsoft Academic Search

    Abdullahi Arabo

    2008-01-01

    The use of mobile handheld devices is expanding rapidly both within the business and individual context. These devices are now essential tools that offer competitive business advantages in todaypsilas growing world of ubiquitous computing environment. The technology advancement has made it possible to embed more facilities in mobile phones. While they provide benefits, they also pose new risks on security

  6. Personalized Intelligent Mobile Learning System for Supporting Effective English Learning

    Microsoft Academic Search

    Chih-ming Chen; Shih-hsun Hsu

    2008-01-01

    Since English has been an international language, how to enhance English levels of people by useful computer assisted learning forms or tools is a critical issue in non-English speaking countries because it definitely affects the overall competition ability of a country. With the rapid growth of wireless and mobile technologies, the mobile learning has been gradually considered as a novel

  7. IP address assignment in a mobile ad hoc network

    Microsoft Academic Search

    Mansoor Mohsin; Ravi Prakash

    2002-01-01

    A mobile ad hoc network (MANET) consists of a set of identical mobile nodes communicating with each other via wireless links. The network's topology may change rapidly and unpredictably. Such networks may operate in a stand-alone fashion, or may be connected to the larger Internet. In traditional networks, hosts rely on centralized servers like DHCP for configuration, but this cannot

  8. Globalization and International Student Mobility: A Network Analysis

    ERIC Educational Resources Information Center

    Shields, Robin

    2013-01-01

    This article analyzes changes to the network of international student mobility in higher education over a 10-year period (1999-2008). International student flows have increased rapidly, exceeding 3 million in 2009, and extensive data on mobility provide unique insight into global educational processes. The analysis is informed by three theoretical…

  9. Assemblage, adaptation and apps: Smartphones and mobile gaming

    Microsoft Academic Search

    Christian Christensen; Patrick Prax

    2012-01-01

    As scholars such as Goggin (2009a) have noted, the rapid uptake of ‘smartphones’ has reshaped the ways in which software developers, users, and academics consider the interrelationship between mobility, culture, technology hardware, and the Internet. In addition, this uptake has added a significant new layer of encrustations around what we might define as ‘standard’ uses of mobile technologies. Once limited

  10. International Mobility of Canadian Social Sciences and Humanities Doctoral Students

    ERIC Educational Resources Information Center

    Knight, Jane; Madden, Meggan

    2010-01-01

    International academic mobility is an aspect of internationalization that is changing rapidly in terms of volume, scope, and impact. Although much of the attention and research on mobility has focused on undergraduate students participating in short-term study abroad, internships, and exchange experiences, the new push to develop international…

  11. Secure Positioning of Mobile Terminals with Simplex Radio Communication

    Microsoft Academic Search

    Mikio Fujii

    2006-01-01

    With the rapid spread of various mobile terminals in our society, the importance of secure position- ing is growing for wireless networks in adversarial settings. Recently, several authors have proposed a secure positioning mechanism of mobile terminals which is based on the geometric property of wire- less node placement, and on the postulate of mod- ern physics that a propagation

  12. Free Market of Crowdsourcing: Incentive Mechanism Design for Mobile Sensing

    E-print Network

    Li, Xiang-Yang

    --Crowdsourcing, incentive mechanism, mobile sensing Ç 1 INTRODUCTION THE market of smartphones has proliferated rapidly-wide Quar- terly Mobile Phone Tracker, 216:2 million smartphones are shipped in the first quarter of 2013 [1 of smartphone-based sensing technologies [3], [4]. Highlighting the participation of smartphone users

  13. Atomic Mobile

    NSDL National Science Digital Library

    In this hands-on OLogy activity, kids learn about matter by building their own models of carbon out of pipe cleaners, wire, and clay. The activity begins with a kid-friendly introduction to matter, elements, and atoms. The illustrated, step-by-step directions show how to use the information about carbon on the Periodic Table to create a mobile that shows the element's basic structure. A PDF version of the Periodic Table, along with a kid-friendly overview of how to read it, is also included.

  14. Investigating the Effectiveness of Tactile Feedback for Mobile Touchscreens

    E-print Network

    Williamson, John

    1 Investigating the Effectiveness of Tactile Feedback for Mobile Touchscreens Eve Hoggan, Stephen A manufacturers and users. As there is no need for a physical keyboard to take up space on the device, they can-operated touchscreen phone. A mobile device user's context can be extremely varied, for example, travelling

  15. Environment Sensing Technologies for Adaptive Mobile User Interfaces

    Microsoft Academic Search

    Albrecht Schmidt; Michael Beigl

    In this paper we analyze the usage of sensors to improve application of ultra-portable mobile devices, such as personal digital assistants (PDAs), wearable computers, or mobile phones. Ultra-portable devices are characterized by being operational while on the move, and have in common that they are used for different tasks as well as in varying environments and situations. We discuss the

  16. A shortest path algorithm for mobile satellite communication network

    Microsoft Academic Search

    Zhang Tao; Zhang Jun; Liu Zhong Kan

    2005-01-01

    Mobile satellite network is a special time-varying network. Some classical network theories used in the current terrestrial networks, such as the shortest path algorithm, cannot be applied to it availably. In this paper, based on the proposed model of mobile satellite network, the classical shortest path algorithm of fixed topological network, such as the Dijkstra algorithm, is proved to be

  17. MAC Sleep Mode Control Considering Downlink Traffic Pattern and Mobility

    E-print Network

    Bahk, Saewoong

    1 MAC Sleep Mode Control Considering Downlink Traffic Pattern and Mobility Neung-Hyung Lee energy loss under varying traffic pattern and mobile environment. In this paper, we propose a sleep mode-- energy saving, sleep mode, doze state. I. INTRODUCTION In wireless communications, the battery power

  18. Simulations of Dynamical Friction Including Spatially-Varying Magnetic Fields

    SciTech Connect

    Bell, G. I.; Bruhwiler, D. L.; Busby, R.; Abell, D. T.; Messmer, P.; Veitzer, S. [Tech-X Corp., Boulder, CO 80303 (United States); Litvinenko, V. N. [Brookhaven National Lab, Upton, NY 11973 (United States); Cary, J. R. [Tech-X Corp., Boulder, CO 80303 (United States); University of Colorado, Boulder, CO 80309 (United States)

    2006-03-20

    A proposed luminosity upgrade to the Relativistic Heavy Ion Collider (RHIC) includes a novel electron cooling section, which would use {approx}55 MeV electrons to cool fully-ionized 100 GeV/nucleon gold ions. We consider the dynamical friction force exerted on individual ions due to a relevant electron distribution. The electrons may be focussed by a strong solenoid field, with sensitive dependence on errors, or by a wiggler field. In the rest frame of the relativistic co-propagating electron and ion beams, where the friction force can be simulated for nonrelativistic motion and electrostatic fields, the Lorentz transform of these spatially-varying magnetic fields includes strong, rapidly-varying electric fields. Previous friction force simulations for unmagnetized electrons or error-free solenoids used a 4th-order Hermite algorithm, which is not well-suited for the inclusion of strong, rapidly-varying external fields. We present here a new algorithm for friction force simulations, using an exact two-body collision model to accurately resolve close interactions between electron/ion pairs. This field-free binary-collision model is combined with a modified Boris push, using an operator-splitting approach, to include the effects of external fields. The algorithm has been implemented in the VORPAL code and successfully benchmarked.

  19. A GUI Crawling-Based Technique for Android Mobile Application Testing

    Microsoft Academic Search

    Domenico Amalfitano; Anna Rita Fasolino; Porfirio Tramontana

    2011-01-01

    As mobile applications become more complex, specific development tools and frameworks as well as costeffective testing techniques and tools will be essential to assure the development of secure, high-quality mobile applications. This paper addresses the problem of automatic testing of mobile applications developed for the Google Android platform, and presents a technique for rapid crash testing and regression testing of

  20. Design of a PKI-Based Secure Architecture for Mobile E-Commerce

    Microsoft Academic Search

    Wu Yanyan

    2010-01-01

    The development of mobile devices and the public key infrastructure (PKI) have improved the rapid development of mobile e-commerce. However, there exits some challenges such as limit computing capacity for PKI-based secure transactions. This paper presents a new system architecture which includes client, mobile operator, service provider, certificate authority and so on. On this basis, the protocols for authentication and

  1. An encompassing view on markdown pricing strategies: an analysis of the Austrian mobile phone market

    Microsoft Academic Search

    Gerald Reiner; Martin Natter

    2007-01-01

    Fierce competition and rapid technological progress have considerably reduced the life cycle length for mobile phones in the last decade. Once a new mobile phone is launched, providers on the market under consideration practice a markdown strategy. Profits of the providers are generated mainly via the monthly (base plus variable) fees accruing during contract duration whereas the mobile phones are

  2. Mobile-IT Education (MIT.EDU): M-Learning Applications for Classroom Settings

    ERIC Educational Resources Information Center

    Sung, M.; Gips, J.; Eagle, N.; Madan, A.; Caneel, R.; DeVaul, R.; Bonsen, J.; Pentland, A.

    2005-01-01

    In this paper, we describe the Mobile-IT Education (MIT.EDU) system, which demonstrates the potential of using a distributed mobile device architecture for rapid prototyping of wireless mobile multi-user applications for use in classroom settings. MIT.EDU is a stable, accessible system that combines inexpensive, commodity hardware, a flexible…

  3. Utilizing Students' Own Mobile Devices and Rich Media: Two Case Studies from the Health Sciences

    Microsoft Academic Search

    Trish Andrews; R. Smyth; R. Caladine

    2010-01-01

    The rapid proliferation of mobile devices nationally coupled with high levels of individual ownership both nationally and internationally provide many opportunities for exploring ways in which students own mobile devices might be integrated into teaching and learning activities in higher education. Amongst other benefits, mobile learning is seen as providing considerable opportunities to link formal and informal learning across a

  4. An Acceptance Model of Wireless Mobile Data Services in China: Combining TAM with Consumer Behavior Model

    Microsoft Academic Search

    Jing Tan; Jiayin Qi

    2009-01-01

    With the development of mobile communication technology, wireless mobile data services have experienced a rapid growth in China. But the acceptance of those services is not well enough. In this paper, we considered the wireless mobile data services as an integrated service, and constructed an acceptance model by combining the technology acceptance model with Hawkins's consumer behavior model to analyze

  5. AuthoCast - a mobility-compliant protocol framework for multicast sender authentication

    Microsoft Academic Search

    Thomas C. Schmidt; Matthias Wählisch; Olaf Christ; Gabriel Hege

    2008-01-01

    Summary Mobility is considered a key technology of the next generation Internet and has been standardized within the IETF. Rapidly emerging multimedia group applications such as IPTV, massive mutliplayer games (MMORPGs) and video conferencing increase the demand for mobile group communication, but a standard design of mobile multicast is still awaited. The open problem poses significant operational and security challenges

  6. Security versus energy tradeoffs in host-based mobile malware detection

    Microsoft Academic Search

    Jeffrey Bickford; H. Andrés Lagar-Cavilla; Alexander Varshavsky; Vinod Ganapathy; Liviu Iftode

    2011-01-01

    The rapid growth of mobile malware necessitates the presence of robust malware detectors on mobile devices. However, running malware detectors on mobile devices may drain their battery, causing users to disable these protection mechanisms to save power. This paper studies the security versus energy tradeoffs for a particularly challenging class of malware detectors, namely rootkit detectors. We investigate the security

  7. Mobile Mapping Service Using Scalable Vector Graphics on the Human Geographic

    Microsoft Academic Search

    Jin-suk Kang; Yonghee You; Mee Young Sung; Taikyeong T. Jeong

    2008-01-01

    Mobile and wireless technologies have evolved rapidly in recent years, especially the development of hardware devices, such as PDA and Smartphone. Telecommunication service providers, manufacturers and other developers have launched different kinds of services and applications in these mobile devices. Mobile Geographic Information and Location Based Service appear recently to help people to establish spatial relationship with the surroundings. Map,

  8. MOBILE LABORATORY FOR BACILLUS ANTHRACIS DETECTION

    Technology Transfer Automated Retrieval System (TEKTRAN)

    In response to a bioterrorism event in the Washington, DC area in October 2001 a mobile laboratory (ML) was set up in the city to conduct rapid molecular tests on environmental samples for the detection of Bacillus anthracis spores. The ML contained two Class I laminar flow hoods, a small autoclave,...

  9. Mobile phone in the Chain of Survival

    Microsoft Academic Search

    Ivor Kovic; Ileana Lulic

    2011-01-01

    Each day, approximately 750 Europeans suffer from an out-of-hospital cardiac arrest, which presents a large public health problem. In such circumstances, rapid activation of the Chain of Survival with effective and continuous realisation of its four links can have a large impact on survival. Mobile phones, which have become the most ubiquitous piece of modern technology, possess a strong potential

  10. Hardware Simulator: Digital Block Design for LTE Applications with Time-Varying MIMO Channels

    E-print Network

    Paris-Sud XI, Université de

    with the Long Term Evolution System (LTE) and Wireless Local Area Networks (WLAN) 802.11ac standards the performance of various equipments. This paper presents new frequency domain and time domain architectures; Time-varying MIMO radio channels; LTE I. INTRODUCTION ARDWARE simulators of mobile radio channel

  11. Efficient Support of Video Streaming to Mobile Devices with Utilization of Multiple Radio Interfaces

    E-print Network

    Langendoen, Koen

    Efficient Support of Video Streaming to Mobile Devices with Utilization of Multiple Radio;#12;#12;Abstract An annoying experience in streaming multimedia to the mobile user is a fluctuating me- dia quality due to the varying characteristics of the wireless link. This thesis aims to improve the mobile user

  12. Seeing is Not Believing: Visual Verifications through Liveness Analysis using Mobile Devices

    E-print Network

    Carbunar, Bogdan

    - bile apps utilize mobile device cameras for purposes varying from authentication to location the fundamental question of whether the visual stream coming into a mobile app from the camera of the device can the fundamental question of whether the vi- sual stream that a mobile app receives from the camera of the device

  13. Stochastic Differential Equations for Modeling, Estimation and Identification of Mobile-to-Mobile Communication Channels

    SciTech Connect

    Olama, Mohammed M [ORNL; Djouadi, Seddik M [ORNL; Charalambous, Prof. Charalambos [University of Cyprus

    2009-01-01

    Mobile-to-mobile networks are characterized by node mobility that makes the propagation environment time varying and subject to fading. As a consequence, the statistical characteristics of the received signal vary continuously, giving rise to a Doppler power spectral density (DPSD) which varies from one observation instant to the next. The current models do not capture and track the time varying characteristics. This paper is concerned with dynamical modelling of mobile-to-mobile channels, parameter estimation and identification from received signal measurements. The evolution of the propagation environment is described by stochastic differential equations. In particular, it is shown that the parameters of the models can be determined by approximating the band-limited DPSD using the Gauss-Newton method. However, since the DPSD is not available online, we propose to use a filter-based expectation maximization algorithm and Kalman filter to estimate the channel parameters and states, respectively. The scheme results in a finite dimensional filter which only uses the first and second order statistics. The algorithm is recursive allowing the inphase and quadrature components and parameters to be estimated online from received signal measurements. The algorithms are tested using experimental data collected from moving sensor nodes in indoor and outdoor environments demonstrating the method s viability.

  14. Color Constancy for Scenes with Varying Illumination (Color Constancy with Varying Illumination)

    E-print Network

    Barnard, Kobus

    Color Constancy for Scenes with Varying Illumination (Color Constancy with Varying Illumination, Graham Finlayson, and Brian Funt, ``Colour constancy for scenes with varying illumination,'' Computer Abstract We present an algorithm which uses information from both surface reflectance and illumination

  15. Color Constancy for Scenes with Varying Illumination (Color Constancy with Varying Illumination)

    E-print Network

    Barnard, Kobus

    Color Constancy for Scenes with Varying Illumination (Color Constancy with Varying Illumination, Graham Finlayson, and Brian Funt, "Colour constancy for scenes with varying illumination," Computer;2 Abstract We present an algorithm which uses information from both surface reflectance and illumination

  16. Future Trends in Mobile Commerce: Service Offerings, Technological Advances and Security Challenges

    Microsoft Academic Search

    Ali Grami; Bernadette Schell

    2004-01-01

    Driven by the ubiquitous deployment of mobile systems, the widespread use of the Internet, the rapid advances in wireless technologies, the insatiable demand for high-speed interactive multimedia services, and the growing need for secure wireless machine-to-machine communications, mobile commerce is rapidly approaching the business forefront. In this paper, future trends in major aspects of mobile commerce are discussed. In light

  17. Rapid Prototyping: Lessons Learned

    Microsoft Academic Search

    V. Scott Gordon; James M. Bieman

    1995-01-01

    Rapid prototyping is a development method that may or may not be e ective in improving software products and process. Assessing the e ectiveness of rapid prototyping requires empirical data. We analyze 39 published and unpublished \\\\real world\\

  18. MIST: Cellular data network measurement for mobile applications

    Microsoft Academic Search

    Mike P. Wittie; Brett Stone-gross; Kevin C. Almeroth; Elizabeth M. Belding

    2007-01-01

    The rapid growth in the popularity of cellular networks has led to aggressive deployment and a rapid expansion of mobile services. Services based on the integration of cellular networks into the Internet have only recently become available, but are expected to become very popular. One current limitation to the deployment of many of these services is poor or unknown network

  19. Mobile Game Based Learning: Designing a Mobile Location Based Game

    NASA Astrophysics Data System (ADS)

    Schadenbauer, Sandra

    Today’s students grow up with rapidly changing technology. They spend much of their spare time using computer games, mobile phones and other toys and tools of the digital age. These things are part of their lives. Now it’s time to redesign the educational system and to adjust it to today’s technological opportunities. The current system is out of date. It isn’t able to arouse interest in students. With new technology, schools are able to rebuild their educational system and to spark the student’s interest in learning and further education. Passive and disinterested children will be a thing of the past.

  20. How does Electrophoretic Mobility Reflect Polyelectrolyte Charge?

    NASA Astrophysics Data System (ADS)

    Hoagland, David; Popov, Alexei

    2003-03-01

    To unravel factors that determine effective polyelectrolyte charge, the mobilities of various ionenes were measured by capillary electrophoresis in variable dielectric constant solvents. Ionenes derive charge from regularly spaced, quaternized nitrogens located in the chain backbone; synthetic methods allow direct control of this spacing. The study sheds light on two questions: (1) Does the dimensionless charge density parameter (predicted to collapse trends of dielectric constant, temperature, and charge spacing) accurately capture polyelectrolyte charge? (2) Does counterion condensation explain trends in mobility as the charge density parameter is varied? A negative response is returned for (1), since plotting mobility against dimensionless charge density does not generate a master curve. A less certain response is returned for (2), since mobility does not saturate with increasing dielectric constant but does with decreasing charge spacing. These responses are discussed in terms of preferential chain solvation, specific ion effects, the electrophoretic "relaxation" effect, etc.

  1. Mobile instant messaging

    Microsoft Academic Search

    Roland Parviainen; Peter Parnes

    2003-01-01

    We describe a mobile instant messaging system, MIM, designed for mobile environments. During the design of mobile applications, several new problems and possibilities have to be considered that do not exist with applications targeted at desktop PCs. One example of an application not designed for a mobile environment is the current, very popular, instant messaging, typified by systems such as

  2. Mobile Informal Learning

    Microsoft Academic Search

    Christian Glahn; Dirk Börner

    2010-01-01

    Mobile technologies play an important role in contemporary communication. Starting from mobile telephony, mobile devices are increasingly becoming ubiquitous devices for personal information management and communication through different channels. These new devices shape our perception of information, communication, participation, and learning. Moreover, new and smart mobile technology challenges the current views on education and learning more radically then the worldwide

  3. How Mobility Increases Mobile Cloud Computing Processing Capacity

    E-print Network

    Paris-Sud XI, Université de

    How Mobility Increases Mobile Cloud Computing Processing Capacity Anh-Dung Nguyen, Patrick S--In this paper, we address a important and still unanswered question in mobile cloud computing "how mobility the resilience of mobile cloud computing services. Keywords--Mobile cloud computing, mobility, quality of service

  4. Smartphones Enabling Mobile Collaboration

    Microsoft Academic Search

    Bettina Beurer-zuellig; Miriam Meckel

    2008-01-01

    Mobilization of the work-force is demanding new mobile and wireless technologies to facilitate contact between the growing number of mobile eWorkers and organizations. Smartphones incorporating mobile e-mail functionality enable instant access to e-mail boxes and company resources without complex synchronization. A study amongst sixteen German companies was conducted to elicit the influence of mobile e-mail on work-processes and communication. The

  5. Overview of the retention in subcritical fluid chromatography with varied polarity stationary phases.

    PubMed

    Lesellier, Eric

    2008-05-01

    Retention and separation of achiral compounds in supercritical fluid chromatography (SFC) depend on numerous parameters: some of these parameters are identical to those encountered in HPLC, such as the mobile phase polarity, while others are specific to SFC, as the density changes of the fluid, due to temperature and/or pressure variations. Additional effects are also related to the fluid compressibility, leading to unusual retention changes in SFC, for instance when flow rate or column length is varied. These additional effects can be minimised by working at lower temperatures in the subcritical domain, simplifying the understanding of retention behaviours. In these subcritical conditions, varied modifiers can be mixed to carbon dioxide, from hexane to methanol, allowing tuning the mobile phase polarity. With nonpolar modifiers, polar stationary phases are classically used. These chromatographic conditions are close to the ones of normal-phase LC. The addition of polar modifiers such as methanol or ACN increases the mobile phase polarity, allowing working with less polar stationary phases. In this case, despite the absence of water, retention behaviours generally follow the rules of RP LC. Moreover, because identical mobile phases can be used with all stationary phase types, from polar silica to nonpolar C18-bonded silica, the classical domains, RP and normal-phase, are easily brought together in SFC. A unified classification method based on the solvation parameter model is proposed to compare the stationary phase properties used with the same subcritical mobile phase. PMID:18398866

  6. Identification of linear parameter varying models

    Microsoft Academic Search

    B. Bamieh; L. Giarre

    1999-01-01

    We consider the problem of identifying discrete-time linear parameter varying models of nonlinear or time-varying systems. We assume that inputs, outputs and the scheduling parameters are measured, and a form of the functional dependence of the coefficients on the parameters. We show how the identification problem can be reduced to a linear regression, and we give conditions on persistency of

  7. Robust identification of linear parameter varying systems

    Microsoft Academic Search

    Maria Cecilia Mazzaro; E. A. Movsichoff; R. S. S. Pena

    1999-01-01

    We study the robust identification problem for a special class of linear parameter varying systems, when it is assumed that there is only one varying parameter and all the states of the system under identification can be measured. We consider a worst-case approach, i.e., we look for a set of models in a class of systems defined a priori, which

  8. Fractal analysis of time varying data

    DOEpatents

    Vo-Dinh, Tuan (Knoxville, TN); Sadana, Ajit (Oxford, MS)

    2002-01-01

    Characteristics of time varying data, such as an electrical signal, are analyzed by converting the data from a temporal domain into a spatial domain pattern. Fractal analysis is performed on the spatial domain pattern, thereby producing a fractal dimension D.sub.F. The fractal dimension indicates the regularity of the time varying data.

  9. A Varying-e Brane World Cosmology

    NASA Astrophysics Data System (ADS)

    Youm, Donam

    We study a varying electric charge brane world cosmology in the RS2 model obtained from a varying-speed-of-light brane world cosmology by redefining the system of units. We elaborate conditions under which the flatness problem and the cosmological constant problem can be resolved by such cosmological model.

  10. 1. Introduction Rapid advances in mobile computing devices and sensor

    E-print Network

    Zhu, Zhigang

    provides real-time control for data capture, and to some extent, local analysis of captured data/audio, text, location and movement, and physiological data. The results of this analysis are "elemental Audio & Speech Analytics Location & Movement Analytics Physiological Analytics Body Pose Excited, Tired

  11. ECG R-R peak detection on mobile phones.

    PubMed

    Sufi, F; Fang, Q; Cosic, I

    2007-01-01

    Mobile phones have become an integral part of modern life. Due to the ever increasing processing power, mobile phones are rapidly expanding its arena from a sole device of telecommunication to organizer, calculator, gaming device, web browser, music player, audio/video recording device, navigator etc. The processing power of modern mobile phones has been utilized by many innovative purposes. In this paper, we are proposing the utilization of mobile phones for monitoring and analysis of biosignal. The computation performed inside the mobile phone's processor will now be exploited for healthcare delivery. We performed literature review on RR interval detection from ECG and selected few PC based algorithms. Then, three of those existing RR interval detection algorithms were programmed on Java platform. Performance monitoring and comparison studies were carried out on three different mobile devices to determine their application on a realtime telemonitoring scenario. PMID:18002800

  12. Rapid fabrication of microcomponents

    NASA Astrophysics Data System (ADS)

    Hanemann, Thomas; Hausselt, Juergen H.; Ruprecht, Robert; Skrifvars, M.; Zum Gahr, K.-H.; Pfleging, Wilhelm

    2000-04-01

    In the macroscopic world different 'rapid'-technologies like Rapid Prototyping, Rapid Manufacturing or Rapid Tooling have been established for a fast prototype or molding tool development. In all cases CAD-data can be transformed in a model or prototype directly using a laser which polymerizes reactive resin layer by layer to a final 3D mold within a short period. In this work the rapid fabrication of micro components made from polymers or composites will be presented. The whole fabrication process is divided into two main steps: Firstly laser assisted micro machining using Nd:YAG and KrF-Excimer laser allows a rapid manufacturing of micro structured cemented carbide or steel mold inserts. Secondly the application of light induced reaction injection molding using reactive monomer/polymer resins gives access to the replication of the previously fabricated mold insert. The total processing period starting from CAD until the modeled micro structured part is less than one week.

  13. Third International Workshop on Ion Mobility Spectrometry

    NASA Technical Reports Server (NTRS)

    Cross, John H. (editor)

    1995-01-01

    Basic research in ion mobility spectrometry has given rise to rapid advancement in hardware development and applications. The Third International Workshop on Ion Mobility Spectrometry (IMS) was held October 16-19, 1994, at Johnson Space Center to provide a forum for investigators to present the most recent results of both basic and applied IMS research. Presenters included manufacturers and various users, including military research organizations and drug enforcement agencies. Thirty papers were given in the following five sessions: Fundamental IMS Studies, Instrument Development, Hyphenated IMS Techniques, Applications, and Data Reduction and Signal Processing. Advances in hardware development, software development, and user applications are described.

  14. Information efficiency and transmission range optimization for coded MIMO FH-CDMA Ad Hoc networks in time-varying environments

    Microsoft Academic Search

    Haichang Sui; James R. Zeidler

    2009-01-01

    Optimization of the transmission range in terms of max- imizing information efficiency is studied in this paper for mobile ad hoc networks (MANETs) with frequency-hopped (FH) CDMA and multiple antennas. Realistic channel models are employed to account for path-loss, log-normal shadowing, and Rayleigh fading. The shadowing and fading are assumed time-varying with different time-scales due to mobility and hopping. The

  15. Mathematical Geology, Vol. 32, No. 7, 2000 Surface Fitting of Rapidly Varying Data Using Rank

    E-print Network

    Komatitsch, Dimitri

    Coding: Application to Geophysical Surfaces1 Christian Gout2 and Dimitri Komatitsch3 Addressing Mathematics, ERS 2055-CNRS, Universit´e de Pau, France. e-mail: christian.gout@univ-pau.fr 3Department;874 Gout and Komatitsch medium-resolution set of surface points, often called a digital elevation model

  16. Rapidly-Varying Speed of Sound, Scale Invariance and Non-Gaussian Signatures

    E-print Network

    Justin Khoury; Federico Piazza

    2011-03-17

    We show that curvature perturbations acquire a scale invariant spectrum for any constant equation of state, provided the fluid has a suitably time-dependent sound speed. In order for modes to exit the physical horizon, and in order to solve the usual problems of standard big bang cosmology, we argue that the only allowed possibilities are inflationary (albeit not necessarily slow-roll) expansion or ekpyrotic contraction. Non-Gaussianities offer many distinguish features. As usual with a small sound speed, non-Gaussianity can be relatively large, around current sensitivity levels. For DBI-like lagrangians, the amplitude is negative in the inflationary branch, and can be either negative or positive in the ekpyrotic branch. Unlike the power spectrum, the three-point amplitude displays a large tilt that, in the expanding case, peaks on smallest scales. While the shape is predominantly of the equilateral type in the inflationary branch, as in DBI inflation, it is of the local form in the ekpyrotic branch. The tensor spectrum is also generically far from scale invariant. In the contracting case, for instance, tensors are strongly blue tilted, resulting in an unmeasurably small gravity wave amplitude on cosmic microwave background scales.

  17. Rapidly-varying speed of sound, scale invariance and non-Gaussian signatures

    SciTech Connect

    Khoury, Justin; Piazza, Federico, E-mail: jkhoury@perimeterinstitute.ca, E-mail: fpiazza@perimeterinstitute.ca [Perimeter Institute for Theoretical Physics, Waterloo, Ontario, N2L 2Y5 (Canada)

    2009-07-01

    We show that curvature perturbations acquire a scale invariant spectrum for any constant equation of state, provided the fluid has a suitably time-dependent sound speed. In order for modes to exit the physical horizon, and in order to solve the usual problems of standard big bang cosmology, we argue that the only allowed possibilities are inflationary (albeit not necessarily slow-roll) expansion or ekpyrotic contraction. Non-Gaussianities offer many distinguish features. As usual with a small sound speed, non-Gaussianity can be relatively large, around current sensitivity levels. For DBI-like lagrangians, the amplitude is negative in the inflationary branch, and can be either negative or positive in the ekpyrotic branch. Unlike the power spectrum, the three-point amplitude displays a large tilt that, in the expanding case, peaks on smallest scales. While the shape is predominantly of the equilateral type in the inflationary branch, as in DBI inflation, it is of the local form in the ekpyrotic branch. The tensor spectrum is also generically far from scale invariant. In the contracting case, for instance, tensors are strongly blue tilted, resulting in an unmeasurably small gravity wave amplitude on cosmic microwave background scales.

  18. A Method for Determining Autoignition Temperatures Resulting from Varying Rapid Rise Rates

    NASA Technical Reports Server (NTRS)

    Hagopian, Michael; McCardle, Kenneth; McDougle, Stephen; Saulsberry, Regor; Sipes, William

    2007-01-01

    Pyrotechnic and explosive devices are widely used in the aerospace industry to provide reliable, lightweight initiation components in ignition systems, cartridge actuated devices, escape and ejection systems, and many other applications. There are two major mechanisms for initiation of the pyrotechnic powders: heat and shock. Of powders initiated by heat, we have little information on the temperature required for ignition in the normal functioning time (milliseconds) of the device. The known autoignition temperatures obtained from standard tests provide data from days down to minutes with temperatures increasing as heating time decreases. In order to better understand this relationship, and to make computer models, improved data are needed.

  19. Rapid and slow: Varying magma ascent rates as a mechanism for Vulcanian explosions

    NASA Astrophysics Data System (ADS)

    Cassidy, Mike; Cole, Paul. D.; Hicks, Kelby E.; Varley, Nick R.; Peters, Nial; Lerner, Allan H.

    2015-06-01

    Vulcanian explosions are one of the most common types of volcanic activity observed at silicic volcanoes. Magma ascent rates are often invoked as being the fundamental control on their explosivity, yet this factor is poorly constrained for low magnitude end-member Vulcanian explosions, which are particularly poorly understood, partly due to the rarity of ash samples and low gas fluxes. We describe ash generated by small Vulcanian explosions at Volcán de Colima in 2013, where we document for the first time marked differences in the vesicularity, crystal characteristics (volume fraction, size and shape) and glass compositions in juvenile material from discrete events. We interpret these variations as representing differing ascent styles and speeds of magma pulses within the conduit. Heterogeneous degassing during ascent leads to fast ascending, gas-rich magma pulses together with slow ascending gas-poor magma pulses within the same conduit. This inferred heterogeneity is complemented by SO2 flux data, which show transient episodes of both open and closed system degassing, indicating efficient shallow fracture sealing mechanisms, which allows for gas overpressure to generate small Vulcanian explosions.

  20. A Technique for Rapid Estimation of the Charge Distribution of Submicron Aerosols under Atmospheric Conditions

    Microsoft Academic Search

    Alison J. Buckley; Matthew D. Wright; Denis L. Henshaw

    2008-01-01

    A portable technique is presented for rapid estimation of the charge distribution of submicron aerosols under atmospheric conditions, using two Differential Mobility Analyzer (DMA) systems in parallel. Simultaneous measurement of the aerosol mobility and size distributions are made by using one DMA with a neutralizer and the other without. An estimate of the aerosol charge is obtained by a fitting

  1. Pharmacoeconomics of hematopoietic stem cell mobilization: an overview of current evidence and gaps in the literature.

    PubMed

    Shaughnessy, Paul; Chao, Nelson; Shapiro, Jamie; Walters, Kent; McCarty, John; Abhyankar, Sunil; Shayani, Sepideh; Helmons, Pieter; Leather, Helen; Pazzalia, Amy; Pickard, Simon

    2013-09-01

    Adequate hematopoietic stem cell (HSC) mobilization and collection is required prior to proceeding with high dose chemotherapy and autologous hematopoietic stem cell transplant. Cytokines such as G-CSF, GM-CSF, and peg-filgrastim, alone or in combination with plerixafor, and after chemotherapy have been used to mobilize HSCs. Studies have shown that the efficiency of HSC mobilization and collection may vary when different methods of mobilization are used. No studies have shown that survival is significantly affected by the method of mobilization, but some studies have suggested that cost and resource utilization may be different between different mobilization techniques. After the FDA approval of plerixafor with G-CSF to mobilize HSCs many transplant centers became concerned about the cost of HSC mobilization. A panel of experts was convened ant this paper reviews the current literature on the pharmacoeconomics of HSC mobilization. PMID:23685251

  2. Mobile applications and Virtual Observatory

    NASA Astrophysics Data System (ADS)

    Schaaff, A.; Jagade, S.

    2015-06-01

    Within a few years, smartphones and Internet tablets have become the devices to access Web or standalone applications from everywhere, with a rapid development of the bandwidth of the mobile networks (e.g. 4G). Internet tablets are used to take notes during meetings or conferences, to read scientific papers in public transportation, etc. A smartphone is for example a way to have your data in the pocket or to control, from everywhere, the progress of a heavy workflow process. These mobile devices have enough powerful hardware to run more and more complex applications for many use cases. In the field of astronomy it is possible to use these tools to access data via a simple browser, but also to develop native applications reusing libraries (written in Java for Android or Objective-C/Swift for iOS) developed for desktops/laptops. We describe the experiments conducted in this domain, at CDS and IUCAA, considering a mobile application as a native application as well as a Web application.

  3. Rapid Solidification of Magnetic Oxides

    NASA Technical Reports Server (NTRS)

    Kalonji, G.; Deguire, M. R.

    1985-01-01

    The enhanced control over microstructural evolution inherent in rapid solidification processing techniques are exploited to create novel ceramic magnetic materials. The great sensitivity of magnetic properties to local structure provides a powerful probe both for the study of structure and of microscopic solidification mechanisms. The first system studied is the SrO-Fe2O3 binary, which contains the commercially important hard magnetic compound strontium hexaferrite. The products were analyzed by transmission electron microscopy, Mossbauer spectroscopy, magnetic measurements, and differential thermal analysis. As-quenched ribbons contain high concentrations of super-paramagnetic particles, 80 to 250 Angstroms in diameter, in a glassy matrix. This suggests the possibility of crystallizing monodomain strontium hexaferrite during subsequent heat treatment, with a resulting increase in coercivity over conventionally processed ferrite magnets. That magnetic properties can be controlled in solidification processing by varying the quench rate is demonstrated.

  4. Mobile Computing/Mobile Computing/Mobile Computing/Mobile Computing/ MobileMobileMobileMobile NetworkingNetworkingNetworkingNetworking

    E-print Network

    Yu, Chansu

    Contents Mobile IP in ns-2 Wired-cum-wireless extension MobileIP extension Monitoring a variable Periodic probing Tracing Command method #12;3 Ns-2 Extensions to support wired+wireless node (16.2.1) What if we need to simulate multiple wireless LANs connected through wired nodes? Wired-cum-wireless in ns-2 (ns-2

  5. Mobile police service in mobile government

    Microsoft Academic Search

    Hamid-Reza Firoozy-Najafabadi; Saeid Pashazadeh

    2011-01-01

    Mobile government is a subset of electronic government and has produced significant changes in the field of information and communication technology (ICT). Increased development and improvement of portable wireless devices especially cell phone and PDAs has provided the possibility that governments offer some helpful and efficient mobile services for citizens via these devices. Citizens will be able to access offered

  6. Autonomous Virtual Mobile Nodes

    E-print Network

    Dolev, Shlomi

    2005-06-15

    This paper presents a new abstraction for virtual infrastructure in mobile ad hoc networks. An AutonomousVirtual Mobile Node (AVMN) is a robust and reliable entity that is designed to cope with theinherent difficulties ...

  7. Mobile Proactive secret sharing

    E-print Network

    Schultz, David Andrew

    2007-01-01

    This thesis describes mobile proactive secret sharing (MPSS), an extension of proactive secret sharing. Mobile proactive secret sharing is much more flexible than proactive secret sharing in terms of group membership: ...

  8. Rapidly solidified materials, 1985

    Microsoft Academic Search

    P. W. Lee; R. S. Carbonara

    1985-01-01

    This book presents the papers given at a conference on phase transformations in metals. Topics considered at the conference included rapidly solidified titanium alloys, aging response of rapidly solidified titanium-tungsten alloys, silicon diffusion in amorphous alloys, crystalline transformation, structural relaxation, crystallization, surface oxidation, metallic glasses, magnetic properties, calorimetry, microscopy, nucleation, texture formation, austenitic steels, elevated temperature ductility loss, precipitation in

  9. Gifted Rapid Readers.

    ERIC Educational Resources Information Center

    Schale, Florence

    A preliminary study is reported which attempted to define gifted rapid readers, authenticate the performances of three subjects who were designated as gifted rapid readers, and explore the relationship of a subject's ability to perceive print eidetically and to read and/or skim. Volunteer subjects were a 15-year-old girl from the Philippines, a…

  10. Electrophoretic mobilities of erythrocytes in various buffers

    NASA Technical Reports Server (NTRS)

    Plank, L. D.; Kunze, M. E.; Todd, P. W.

    1985-01-01

    The calibration of space flight equipment depends on a source of standard test particles, this test particle of choice is the fixed erythrocyte. Erythrocytes from different species have different electrophoretic mobilities. Electrophoretic mobility depends upon zeta potential, which, in turn depends upon ionic strength. Zeta potential decreases with increasing ionic strength, so cells have high electrophoretic mobility in space electrophoresis buffers than in typical physiological buffers. The electrophoretic mobilities of fixed human, rat, and rabbit erythrocytes in 0.145 M salt and buffers of varying ionic strength, temperature, and composition, to assess the effects of some of the unique combinations used in space buffers were characterized. Several effects were assessed: glycerol or DMSO (dimethylsulfoxide) were considered for use as cryoprotectants. The effect of these substances on erythrocyte electrophoretic mobility was examined. The choice of buffer depended upon cell mobility. Primary experiments with kidney cells established the choice of buffer and cryoprotectant. A nonstandard temperature of EPM in the suitable buffer was determined. A loss of ionic strength control occurs in the course of preparing columns for flight, the effects of small increases in ionic strength over the expected low values need to be evaluated.

  11. Global Mobility for Psychologists: The Role of Psychology Organizations in the United States, Canada, Europe, and Other Regions

    ERIC Educational Resources Information Center

    Hall, Judy E.; Lunt, Ingrid

    2005-01-01

    Global mobility for psychologists is rapidly improving because of an emerging consensus on recognition standards, the demand for cross-border mobility both internal and external to the profession, and the efforts of membership, credentialing, and regional organizations to promote mobility. In the United States, multiple credentialing organizations…

  12. Improvement of the QoS via an Adaptive and Dynamic Distribution of Applications in a Mobile Environment

    Microsoft Academic Search

    Françoise André; Anne-marie Kermarrec; Frederic Le Mouel

    2000-01-01

    Mobile computing is a domain in great expansion. Wire- less networks and Portable Information Appliances (PIAs) are developing very rapidly. More and more mobile users would like to perform their multimedia applications with the same facility as on their desktop station. Use of such ap- plications in a mobile environment raises new challenges. These applications are interactive and extremely costly

  13. Methods of Recording Rapid Wind Changes

    NASA Technical Reports Server (NTRS)

    Magnan, A

    1932-01-01

    The purpose of our research was to determine the rapid changes of air currents which impose varying stresses on the wings of airplanes. We attempted to express in figures the turbulence of the air, which perhaps plays some role in the behavior of airplanes in flight, as well as in the realization of certain methods of gliding flight. This is the reason which led us to conceive and develop the experimental equipment (hot-wire anemometer) described herein.

  14. System Identification: Time Varying and Nonlinear Methods 

    E-print Network

    Majji, Manoranjan

    2010-07-14

    Novel methods of system identification are developed in this dissertation. First set of methods are designed to realize time varying linear dynamical system models from input-output experimental data. The preliminary results obtained in a recent...

  15. System Identification: Time Varying and Nonlinear Methods

    E-print Network

    Majji, Manoranjan

    2010-07-14

    Novel methods of system identification are developed in this dissertation. First set of methods are designed to realize time varying linear dynamical system models from input-output experimental data. The preliminary results obtained in a recent...

  16. Mobility control agents

    Microsoft Academic Search

    E. C. Hammershaimb; V. A. KuugKraa

    1983-01-01

    Enhanced oil recovery (EOR) by means of steam drive, for heavier crudes, and COâ flooding, for lighter, mobilizes oil left behind by more conventional methods and displaces it to producing wells. In higher mobility, fingering, and flow of the drive or flood substance through low permeability paths, reduces the efficiency of EOR. Mobility control agents block these permeable paths. Five

  17. Mobile Ad hoc Networking

    Microsoft Academic Search

    Carlos de Morais Cordeiro; Dharma P. Agrawal

    2002-01-01

    Recent advances in portable computing and wireless technologies are opening up exciting possibilities for the future of wireless mobile networking. A Mobile Ad hoc NETwork (MANET) consists of mobile platforms which are free to move arbitrarily. This is in contrast with the topology of the existing Internet, where the router topology is essentially static (barring network configuration or router failures).

  18. Mobility and Young Children.

    ERIC Educational Resources Information Center

    Bernard van Leer Foundation Newsletter, 1994

    1994-01-01

    This newsletter theme issue deals with the phenomenon of mobility or transience in India, Kenya, Greece, Ireland, Malaysia, Thailand and Israel. The primary focus is on mobility's effect on young children, specifically their health and education; some of the broader concerns also addressed by the newsletter are the causes of mobility and its…

  19. Towards Mobile Cryptography

    Microsoft Academic Search

    Tomas Sander; Christian F. Tschudin

    1998-01-01

    Mobile code technology has become a driving force for recent advances in distributed systems. The concept of mo- bility of executable code raises major security problems. I n this paper we deal with the protection of mobile code from possibly malicious hosts. We conceptualize on the specific cryptographic problems posed by mobile code. We are able to provide a solution

  20. Mobile Conference Connection Conferencing

    E-print Network

    Mobile Conference Connection Conferencing · Help increase productivity while out of the office Meeting conference and add participants instantly Business doesn't stop when you're unable to meet, Mobile Conference Connection--our latest mobile device application that enables registered Instant

  1. Time-varying modulated lapped transforms

    Microsoft Academic Search

    J. Kovacevic; Martin Vetterli

    1993-01-01

    We consider the problem of time-varying orthonormal tilings of the time-frequency plane. A very elegant way of obtaining such tilings is by using time-varying modulated lapped transforms. We offer ways of constructing these, by using either boundary or overlapping modulated lapped transforms The advantage of using modulated lapped transforms is that all the filters, both at transitions and within decompositions,

  2. Supporting Mobile Multicast in Mobile Networks by Considering Host Mobility

    Microsoft Academic Search

    Jin Park; Young-joo Suh; Shin-gak Kang

    2002-01-01

    Mobile computing and multimedia application are two emerging trends in computer systems. ‘Multicast’ reduces the number of\\u000a multimedia traffics by delivering a single stream of information to thousands of recipients simultaneously. Since multicast\\u000a routing protocols being used in a wired network were originally designed for stationary host, they do not consider the dynamic\\u000a location changes of mobile hosts. Therefore, the

  3. Subcortical amygdala pathways enable rapid face processing

    PubMed Central

    Garvert, Mona M.; Friston, Karl J.; Dolan, Raymond J.; Garrido, Marta I.

    2014-01-01

    Human faces may signal relevant information and are therefore analysed rapidly and effectively by the brain. However, the precise mechanisms and pathways involved in rapid face processing are unclear. One view posits a role for a subcortical connection between early visual sensory regions and the amygdala, while an alternative account emphasises cortical mediation. To adjudicate between these functional architectures, we recorded magnetoencephalographic (MEG) evoked fields in human subjects to presentation of faces with varying emotional valence. Early brain activity was better explained by dynamic causal models containing a direct subcortical connection to the amygdala irrespective of emotional modulation. At longer latencies, models without a subcortical connection had comparable evidence. Hence, our results support the hypothesis that a subcortical pathway to the amygdala plays a role in rapid sensory processing of faces, in particular during early stimulus processing. This finding contributes to an understanding of the amygdala as a behavioural relevance detector. PMID:25108179

  4. Reconfigurable mobile manipulation for accident response

    SciTech Connect

    ANDERSON,ROBERT J.; MORSE,WILLIAM D.; SHIREY,DAVID L.; CDEBACA,DANIEL M.; HOFFMAN JR.,JOHN P.; LUCY,WILLIAM E.

    2000-06-06

    The need for a telerobotic vehicle with hazard sensing and integral manipulation capabilities has been identified for use in transportation accidents where nuclear weapons are involved. The Accident Response Mobile Manipulation System (ARMMS) platform has been developed to provide remote dexterous manipulation and hazard sensing for the Accident Response Group (ARG) at Sandia National Laboratories. The ARMMS' mobility platform is a military HMMWV [High Mobility Multipurpose Wheeled Vehicle] that is teleoperated over RF or Fiber Optic communication channels. ARMMS is equipped with two high strength Schilling Titan II manipulators and a suite of hazardous gas and radiation sensors. Recently, a modular telerobotic control architecture call SMART (Sandia Modular Architecture for Robotic and Teleoperation) has been applied to ARMMS. SMART enables input devices and many system behaviors to be rapidly configured in the field for specific mission needs. This paper summarizes current SMART developments applied to ARMMS.

  5. Localization based switching adaptive control for time-varying discrete-time systems

    Microsoft Academic Search

    Peter V. Zhivoglyadov; Richard H. Middleton; Minyue Fu

    2000-01-01

    In this paper a new systematic switching control approach to adaptive stabilization of linear time-varying (LTV) discrete-time systems is presented. A feature of the localization based method is its high model falsification capability, which in the case of LTI systems is manifested as the rapid convergence of the switching controller. We believe that the proposed method may help pave the

  6. Subcellular localization of yeast CDC46 varies with the cell cycle

    E-print Network

    Botstein, David

    Subcellular localization of yeast CDC46 varies with the cell cycle Kevin M. Hennessy, Chris D The Saccbaromyces cerevisiae CDC46 protein accumulates in the nucleus of nondividing interphase cells. Soon after the cell has become committed to division, there is a rapid disappearance of CDC46 protein from the nucleus

  7. The Time Varying Effects of Permanent and Transitory Shocks to Real Output

    Microsoft Academic Search

    John W. Keating; Victor J. Valcarcel

    2012-01-01

    Annual changes in volatility of U.S. real output growth and inflation are documented in data from 1870 to 2009 using a time varying parameter VAR model. Both volatilities rise quickly with World War I and its aftermath, stay relatively high until the end of World War II and drop rapidly until the mid to late-1960s. This Postwar Moderation represents the

  8. Health and Mobility in the UK

    Microsoft Academic Search

    J. A. Newby; V. A. Mountford

    Summary This report addresses mobility and travel in the UK and the consequential cost to the environment, economy, quality of life and health. In 2001, the UK had a rapidly increasing population of 59,030,600 people who need effective, efficient modes of travel. We focus on road traffic accidents as well as the health-related and environmental impacts of road and air

  9. Pilot-Based Estimation of Time-Varying Multipath Channels for Coherent CDMA Receivers

    Microsoft Academic Search

    Marc-antoine R. Baissas; Akbar M. Sayeed

    2000-01-01

    1Reliable coherent communication over mobile wireless channels requires accurateestimation of time-varying multipath channel parameters. This paper addresses two issuesin the context of direct-sequence code-division multiple access (CDMA) multipathchannels: i) linear minimum-mean-squared-error (MMSE) channel estimation based ona pilot transmission, and ii) impact of channel estimation errors on the coherent receiverperformance. A simple characterization of the MMSE estimator in...

  10. Optimal Global Path Planning in Time Varying Environments Based on a Cost Evaluation Function

    Microsoft Academic Search

    Om K. Gupta; Ray A. Jarvis

    2008-01-01

    This paper describes a unique and optimal method for real-time global path planning and collision avoidance for navigation\\u000a of a mobile robot in complex time varying environments. Occupancy based 3D grid map and Gaussian distribution model based\\u000a obstacle prediction are employed to represent the dynamic environment. Path planning and obstacle avoidance are performed\\u000a by applying a cost-evaluation function on time-space

  11. Breath analysis---performance and potential of ion mobility spectrometry

    Microsoft Academic Search

    Wolfgang Vautz; Jürgen Nolte; Rita Fobbe; Jörg Ingo Baumbach

    2009-01-01

    Ion mobility spectrometry is a fast and sensitive analytical method for the detection of gas phase analytes in the ppbv-pptv range under ambient conditions (pressure and temperature). Ion mobility spectrometers coupled with rapid pre-separation like multi-capillary columns (MCC\\/IMS) are suitable for the selective characterization of complex and humid mixtures. Recently, MCC\\/IMS have been applied to analyses of human breath for

  12. Potential field method to navigate several mobile robots

    Microsoft Academic Search

    Saroj Kumar Pradhan; Dayal Ramakrushna Parhi; Anup Kumar Panda; Rabindra Kumar Behera

    2006-01-01

    Navigation of mobile robots remains one of the most challenging functions to carry out. Potential Field Method (PFM) is rapidly\\u000a gaining popularity in navigation and obstacle avoidance applications for mobile robots because of its elegance. Here a modified\\u000a potential field method for robots navigation has been described. The developed potential field function takes care of both\\u000a obstacles and targets. The

  13. The appealing characteristics of download type mobile games

    Microsoft Academic Search

    Chang-Su Kim; Eun-Hai Oh; Kyung Hoon Yang; Jae Kyung Kim

    2010-01-01

    As the mobile game industry enjoys continual and rapid growth in the market and becomes a major sector of the service industry,\\u000a it is of great interest to examine the very features that make mobile games so fascinating and keep its players coming for\\u000a more. Pinpointing more precisely the very factors that increase the attraction of games will help game

  14. The Effects of Gender Culture on Mobile Phone Icon Recognition

    Microsoft Academic Search

    Shunan Chung; Chiyi Chau; Xufan Hsu; Jim Jiunde Lee

    2007-01-01

    Mobile phones have rapidly become the most important communication device in our daily life. According to a recent survey\\u000a of The Directorate of Telecommunications, Ministry of Transportation and Communications in 2005, the penetration rate of telecom\\u000a service subscribers in the Taiwan area is 97.37%. That is, on average, almost every Taiwanese citizen owns a mobile phone.\\u000a This has resulted in

  15. Modified reactive control framework for cooperative mobile robots

    NASA Astrophysics Data System (ADS)

    Salido, Jesus T.; Dolan, John M.; Hampshire, John B., II; Khosla, Pradeep K.

    1997-09-01

    An important class of robotic applications potentially involves multiple, cooperating robots: security or military surveillance, rescue, mining, etc. One of the main challenges in this area is effective cooperative control: how does one determine and orchestrate individual robot behaviors which result in a desired group behavior? Cognitive (planning) approaches allow for explicit coordination between robots, but suffer from high computational demands and a need for a priori, detailed world models. Purely reactive approaches such as that of Brooks are efficient, but lack a mechanism for global control and learning. Neither approach by itself provides a formalism capable of a sufficiently rapid and rich range of cooperative behaviors. Although we accept the usefulness of the reactive paradigm in building up complex behaviors from simple ones, we seek to extend and modify it in several ways. First, rather than restricting primitive behaviors to fixed input-output relationships, we include memory and learning through feedback adaptation of behaviors. Second, rather than a fixed priority of behaviors, our priorities are implicit: they vary depending on environmental stimuli. Finally, we scale this modified reactive architecture to apply not only for an individual robot, but also at the level of multiple cooperating robots: at this level, individual robots are like individual behaviors which combine to achieve a desired aggregate behavior. In this paper, we describe our proposed architecture and its current implementation. The application of particular interest to us is the control of a team of mobile robots cooperating to perform area surveillance and target acquisition and tracking.

  16. Improving stem cell mobilization strategies: future directions

    Microsoft Academic Search

    W Bensinger; J F DiPersio; J M McCarty

    2009-01-01

    Autologous hematopoietic SCT (auto-HSCT) provides hematopoietic support after high-dose chemotherapy and is the standard of care for patients with multiple myeloma (MM) or chemosensitive relapsed high- or intermediate-grade non-Hodgkin's lymphoma (NHL). However, yields of hematopoietic stem cells vary greatly between patients, and the optimal strategy to mobilize hematopoietic stem cells into peripheral blood for collection has not been defined. Current

  17. Fabrication of Non-Assembly Mechanisms and Robotic Systems Using Rapid Prototyping

    Microsoft Academic Search

    ASME Student Mem; Jey Won; Munshi Alam

    2001-01-01

    In this paper, the application of Rapid Prototyping in fabricating non-assembly robotic systems and mechanisms is presented. Using two Rapid Prototyping techniques, Stere- olithography and Selective Laser Sintering, prototypes of mechanical mobile joints were fabricated. The designs of these component joints were then used to fabricate the articu- lated structure of experimental prototypes for two robotic systems: (1) a three-legged

  18. System for rapid subtitling

    E-print Network

    Leonard, Sean Joseph

    2005-01-01

    A system for rapid subtitling of audiovisual sequences was developed, and evaluated. This new system resulted in average time-savings of 50% over the previous work in the field. To subtitle a 27-minute English lecture, ...

  19. An Intelligent Software Workflow Process Design for Location Management on Mobile Devices

    E-print Network

    Rao, N Mallikharjuna

    2012-01-01

    Advances in the technologies of networking, wireless communication and trimness of computers lead to the rapid development in mobile communication infrastructure, and have drastically changed information processing on mobile devices. Users carrying portable devices can freely move around, while still connected to the network. This provides flexibility in accessing information anywhere at any time. For improving more flexibility on mobile device, the new challenges in designing software systems for mobile networks include location and mobility management, channel allocation, power saving and security. In this paper, we are proposing intelligent software tool for software design on mobile devices to fulfill the new challenges on mobile location and mobility management. In this study, the proposed Business Process Redesign (BPR) concept is aims at an extension of the capabilities of an existing, widely used process modeling tool in industry with 'Intelligent' capabilities to suggest favorable alternatives to an ...

  20. Research on the key technologies of mobile digital maps

    NASA Astrophysics Data System (ADS)

    Ji, Cuiling; Xiao, Yongkang; Chi, Tianhe

    2006-10-01

    Mobile and wireless technologies have evolved rapidly in recent years, especially the development of hardware devices, such as PDA and Smart phone. Different kinds of services and applications in these mobile devices, especially Mobile Geographic Information System and Location Based Service have been launched in recent years to help people to establish spatial relationship with the surroundings. Digital Map, which is a useful tool to assist a person for positioning and navigation, is usually included in these services. However, mobility of wireless devices, limited bandwidth of wireless networks, and limited storage capacity of mobile terminals seriously affect the performance of mobile digital maps and its application. In order to boom its application in mobile devices, this paper focuses on four important problems, i.e., data model optimization of mobile digital map, data organization and management at server side and client side respectively, data compression method, representation approaches on mobile terminals. In this paper, we adopt and modify the Europe transportation network standard GDF, accomplish effectively data compression with SVG, and present a new two-layer database structure to organize data. The digital maps can be expressed by multi-approaches, namely layers, districts and scales.

  1. Layered Peer-to-Peer Architecture for Mobile Web Services via Converged Cellular and Ad Hoc Networks

    Microsoft Academic Search

    Zhonghong Ou; Meina Song; Hui Chen; Junde Song

    2008-01-01

    Mobile communication technology is rapidly developed with the enhanced networking capacities as well as the expanding population of mobile subscribers. Providing Web services via converged mobile cellular and Ad Hoc networks has attracted growing attentions. In this paper, a layered peer-to-peer (P2P) architecture is designed for providing Web services via converged mobile cellular and Ad Hoc networks. To speed up

  2. Solar mass-varying neutrino oscillations

    E-print Network

    V. Barger; Patrick Huber; Danny Marfatia

    2005-09-30

    We propose that the solar neutrino deficit may be due to oscillations of mass-varying neutrinos (MaVaNs). This scenario elucidates solar neutrino data beautifully while remaining comfortably compatible with atmospheric neutrino and K2K data and with reactor antineutrino data at short and long baselines (from CHOOZ and KamLAND). We find that the survival probability of solar MaVaNs is independent of how the suppression of neutrino mass caused by the acceleron-matter couplings varies with density. Measurements of MeV and lower energy solar neutrinos will provide a rigorous test of the idea.

  3. Solar mass-varying neutrino oscillations.

    PubMed

    Barger, V; Huber, Patrick; Marfatia, Danny

    2005-11-18

    We propose that the solar neutrino deficit may be due to oscillations of mass-varying neutrinos (MaVaNs). This scenario elucidates solar neutrino data beautifully while remaining comfortably compatible with atmospheric neutrino and K2K data and with reactor antineutrino data at short and long baselines (from CHOOZ and KamLAND). We find that the survival probability of solar MaVaNs is independent of how the suppression of neutrino mass caused by the acceleron-matter couplings varies with density. Measurements of MeV and lower energy solar neutrinos will provide a rigorous test of the idea. PMID:16384133

  4. Solar Mass-Varying Neutrino Oscillations

    SciTech Connect

    Barger, V.; Huber, Patrick [Department of Physics, University of Wisconsin, Madison, Wisconsin 53706 (United States); Marfatia, Danny [Department of Physics and Astronomy, University of Kansas, Lawrence, Kansas 66045 (United States)

    2005-11-18

    We propose that the solar neutrino deficit may be due to oscillations of mass-varying neutrinos (MaVaNs). This scenario elucidates solar neutrino data beautifully while remaining comfortably compatible with atmospheric neutrino and K2K data and with reactor antineutrino data at short and long baselines (from CHOOZ and KamLAND). We find that the survival probability of solar MaVaNs is independent of how the suppression of neutrino mass caused by the acceleron-matter couplings varies with density. Measurements of MeV and lower energy solar neutrinos will provide a rigorous test of the idea.

  5. A security framework for SOA applications in mobile environment

    E-print Network

    Fonseca, Johnneth; Lopes, Denivaldo; Labidi, Sofiane

    2010-01-01

    A Rapid evolution of mobile technologies has led to the development of more sophisticated mobile devices with better storage, processing and transmission power. These factors enable support to many types of application but also give rise to a necessity to find a model of service development. Actually, SOA (Service Oriented Architecture) is a good option to support application development. This paper presents a framework that allows the development of SOA based application in mobile environment. The objective of the framework is to give developers with tools for provision of services in this environment with the necessary security characteristics.

  6. Micromagnetics on high-performance workstation and mobile computational platforms

    NASA Astrophysics Data System (ADS)

    Fu, S.; Chang, R.; Couture, S.; Menarini, M.; Escobar, M. A.; Kuteifan, M.; Lubarda, M.; Gabay, D.; Lomakin, V.

    2015-05-01

    The feasibility of using high-performance desktop and embedded mobile computational platforms is presented, including multi-core Intel central processing unit, Nvidia desktop graphics processing units, and Nvidia Jetson TK1 Platform. FastMag finite element method-based micromagnetic simulator is used as a testbed, showing high efficiency on all the platforms. Optimization aspects of improving the performance of the mobile systems are discussed. The high performance, low cost, low power consumption, and rapid performance increase of the embedded mobile systems make them a promising candidate for micromagnetic simulations. Such architectures can be used as standalone systems or can be built as low-power computing clusters.

  7. Measures of node centrality in mobile social networks

    NASA Astrophysics Data System (ADS)

    Gao, Zhenxiang; Shi, Yan; Chen, Shanzhi

    2015-02-01

    Mobile social networks exploit human mobility and consequent device-to-device contact to opportunistically create data paths over time. While links in mobile social networks are time-varied and strongly impacted by human mobility, discovering influential nodes is one of the important issues for efficient information propagation in mobile social networks. Although traditional centrality definitions give metrics to identify the nodes with central positions in static binary networks, they cannot effectively identify the influential nodes for information propagation in mobile social networks. In this paper, we address the problems of discovering the influential nodes in mobile social networks. We first use the temporal evolution graph model which can more accurately capture the topology dynamics of the mobile social network over time. Based on the model, we explore human social relations and mobility patterns to redefine three common centrality metrics: degree centrality, closeness centrality and betweenness centrality. We then employ empirical traces to evaluate the benefits of the proposed centrality metrics, and discuss the predictability of nodes' global centrality ranking by nodes' local centrality ranking. Results demonstrate the efficiency of the proposed centrality metrics.

  8. Charge Scattering and Mobility in Atomically Thin Semiconductors

    NASA Astrophysics Data System (ADS)

    Ma, Nan; Jena, Debdeep

    2014-01-01

    The electron transport properties of atomically thin semiconductors such as MoS2 have attracted significant recent scrutiny and controversy. In this work, the scattering mechanisms responsible for limiting the mobility of single-layer semiconductors are evaluated. The roles of individual scattering rates are tracked as the two-dimensional electron gas density is varied over orders of magnitude at various temperatures. From a comparative study of the individual scattering mechanisms, we conclude that all current reported values of mobilities in atomically thin transition-metal dichalcogenide semiconductors are limited by ionized impurity scattering. When the charged impurity densities are reduced, remote optical phonon scattering will determine the ceiling of the highest mobilities attainable in these ultrathin materials at room temperature. The intrinsic mobilities will be accessible only in clean suspended layers, as is also the case for graphene. Based on the study, we identify the best choices for surrounding dielectrics that will help attain the highest mobilities.

  9. Mobile mental health: a challenging research agenda.

    PubMed

    Olff, Miranda

    2015-01-01

    The field of mobile health ("m-Health") is evolving rapidly and there is an explosive growth of psychological tools on the market. Exciting high-tech developments may identify symptoms, help individuals manage their own mental health, encourage help seeking, and provide both preventive and therapeutic interventions. This development has the potential to be an efficient cost-effective approach reducing waiting lists and serving a considerable portion of people globally ("g-Health"). However, few of the mobile applications (apps) have been rigorously evaluated. There is little information on how valid screening and assessment tools are, which of the mobile intervention apps are effective, or how well mobile apps compare to face-to-face treatments. But how feasible is rigorous scientific evaluation with the rising demands from policy makers, business partners, and users for their quick release? In this paper, developments in m-Health tools-targeting screening, assessment, prevention, and treatment-are reviewed with examples from the field of trauma and posttraumatic stress disorder. The academic challenges in developing and evaluating m-Health tools are being addressed. Evidence-based guidance is needed on appropriate research designs that may overcome some of the public and ethical challenges (e.g., equity, availability) and the market-driven wish to have mobile apps in the "App Store" yesterday rather than tomorrow. PMID:25994025

  10. Mobile mental health: a challenging research agenda

    PubMed Central

    Olff, Miranda

    2015-01-01

    The field of mobile health (“m-Health”) is evolving rapidly and there is an explosive growth of psychological tools on the market. Exciting high-tech developments may identify symptoms, help individuals manage their own mental health, encourage help seeking, and provide both preventive and therapeutic interventions. This development has the potential to be an efficient cost-effective approach reducing waiting lists and serving a considerable portion of people globally (“g-Health”). However, few of the mobile applications (apps) have been rigorously evaluated. There is little information on how valid screening and assessment tools are, which of the mobile intervention apps are effective, or how well mobile apps compare to face-to-face treatments. But how feasible is rigorous scientific evaluation with the rising demands from policy makers, business partners, and users for their quick release? In this paper, developments in m-Health tools—targeting screening, assessment, prevention, and treatment—are reviewed with examples from the field of trauma and posttraumatic stress disorder. The academic challenges in developing and evaluating m-Health tools are being addressed. Evidence-based guidance is needed on appropriate research designs that may overcome some of the public and ethical challenges (e.g., equity, availability) and the market-driven wish to have mobile apps in the “App Store” yesterday rather than tomorrow. PMID:25994025

  11. Cellular calcium mobilization

    SciTech Connect

    Daniel, E.E.

    1984-01-01

    In vascular and other smooth muscles, occurrence of intracellular Ca stores which can be mobilized to support contraction may be a general phenomenon. The Ca stores are characterized by the requirement for release by high concentrations of agonists acting on plasma membrane receptors, by the failure of the released Ca2+ to recycle to the store, by the occurrence of rapid refilling of the store from the extracellular space, and by disappearance of the store when the plasma membrane is made leaky by saponin. In contrast to agonist-released Ca stores, those released by caffeine to support contraction in Ca2+-free solutions are more slowly lost and refilled, are not always emptied when the agonist-related store is emptied, and do not disappear after saponin treatment. Stores released by agonists have been suggested to be in the endoplasmic reticulum near the plasma membrane or at the inner aspect of the plasma membrane related to high affinity, pH-dependent Ca-binding sites. Caffeine-released stores are assumed to be in endoplasmic reticulum. Continued exposure of some tissues to Ca2+-free solutions unmasks what is considered to be a recycling Ca store releasable by agonists. Release of Ca2+ and its reaccumulation in this store appear to be slower than at the nonrecycling store. The contractions which persist for many hours in Ca2+-free solution are inhibited temporarily by Ca2+ restoration. Existence of a recycling store of releasable Ca2+ requires occurrence of mechanisms to abolish Ca2+ extrusion or leak-out of the cell and to ensure recycling to the same store.

  12. Protecting Location Information of Mobile Nodes in Mobile IPv6

    Microsoft Academic Search

    Robert Huijie DENG; Ying Qiu; Jianying Zhou; Feng Bao

    2006-01-01

    Mobile IPv6 is an IP layer mobility protocol which allows mobile nodes to remain reachable while moving around in the Internet. In the current IETF Mobile IPv6 specifications (D. Johnson et al., 2004), when a mobile node roams, its location movement can be tracked by simply monitoring the IP addresses in IP packets. Recently, the issue of protecting location information

  13. Receiver synchronisation techniques for CDMA mobile radio communications based on the use of a priori information 

    E-print Network

    Vardoulias, George

    Receiver synchronisation can be a major problem in a mobile radio environment where the communication channel is subject to rapid changes. Communication in spread spectrum systems is impossible unless the received spreading ...

  14. Development of legged, wheeled, and hybrid rover mobility models to facilitate planetary surface exploration mission analysis

    E-print Network

    McCloskey, Scott H. (Scott Haddon)

    2007-01-01

    This work discusses the Mars Surface Exploration (MSE) tool and its adaptation to model rovers featuring legged, wheeled, and hybrid mobility. MSE is a MATLAB based systems engineering tool that is capable of rapidly ...

  15. Aligning product and supply chain strategies in the mobile phone industry

    E-print Network

    Scanlon, Robert (Robert Curtis)

    2009-01-01

    Designing and managing the supply chain of a company in the mobile phone industry is particularly challenging. Short product lifecycles, rapidly evolving technology, globally linked distribution networks, increasing product ...

  16. Performance Evaluation of AODV & DSR with Varying Pause Time & Speed Time Over TCP & CBR Connections in VANET

    E-print Network

    Paul, Bijan; Bikas, Md Abu Naser

    2012-01-01

    VANET (Vehicular Ad-hoc Network) is a new technology which has taken enormous attention in the recent years. Vehicular ad hoc network is formed by cars which are called nodes; allow them to communicate with one another without using any fixed road side unit. It has some unique characteristics which make it different from other ad hoc network as well as difficult to define any exact mobility model and routing protocols because of their high mobility and changing mobility pattern. Hence performance of routing protocols can vary with the various parameters such as speed, pause time, node density and traffic scenarios. In this research paper, the performance of two on-demand routing protocols AODV & DSR has been analyzed by means of packet delivery ratio, loss packet ratio & average end-to-end delay with varying pause time, speed time and node density under TCP & CBR connection.

  17. Performance Evaluation of Aodv&DSR with Varying Pause Time & Node Density Over TCP&CBR Connections in Vanet

    E-print Network

    Paul, Bijan; Bikas, Md Abu Naser

    2012-01-01

    Vehicular ad hoc network is formed by cars which are called nodes; allow them to communicate with one another without using any fixed road side unit. It has some unique characteristics which make it different from other ad hoc network as well as difficult to define any exact mobility model and routing protocols because of their high mobility and changing mobility pattern. Hence performance of routing protocols can vary with the various parameters such as speed, pause time, node density and traffic scenarios. In this research paper, the performance of two on-demand routing protocols AODV & DSR has been analyzed by means of packet delivery ratio, loss packet ratio & average end-to-end delay with varying pause time and node density under TCP & CBR connection.

  18. Rapid Cycling and Its Treatment

    MedlinePLUS

    ... may be rapid, ultra-rapid or ultradian cycling. Biological rhythm disturbances: This theory proposes that people with rapid cycling have daily biological rhythms that are out of sync with typical “ ...

  19. Relaxation Assessment with Varied Structured Milieu (RELAX).

    ERIC Educational Resources Information Center

    Cassel, Russell N.; Cassel, Susie L.

    1983-01-01

    Describes Relaxation Assessment with Varied Structured Milieu (RELAX), a clinical program designed to assess the degree to which an individual is able to demonstrate self-control for overall general relaxation. The program is designed for use with the Cassel Biosensors biofeedback equipment. (JAC)

  20. Time-Varying World Market Integration

    Microsoft Academic Search

    Geert Bekaert; Campbell R Harvey

    1995-01-01

    We propose a measure of capital market integration arising from a conditional regime-switching model. Our measure allows us to describe expected returns in countries that are segmented from world capital markets in one part of the sample and become integrated later in the sample. We find that a number of emerging markets exhibit time-varying integration. Some markets appear more integrated

  1. Boiling Radial Flow in Fractures of Varying

    E-print Network

    Stanford University

    apply only to a finite radius around the point of injection, higher values of heat flux and a boilingSGP-TR-166 Boiling Radial Flow in Fractures of Varying Wall Porosity Robb Allan Barnitt June 2000 and boiling convective heat transfer, with boiling flow in a rock fracture. A series of experiments observed

  2. Colour Constancy for Scenes with Varying Illumination

    E-print Network

    Barnard, Kobus

    Colour Constancy for Scenes with Varying Illumination Kobus Barnard 1 , Graham Finlayson 2 surface reflectance and illumination variation to solve for colour constancy. Most colour constancy algorithms assume that the illumination across a scene is constant, but this is very often not valid for real

  3. Segmentation and Estimation of Spatially Varying Illumination

    E-print Network

    Robles-Kelly, Antonio

    Segmentation and Estimation of Spatially Varying Illumination Lin Gu, Student Member, IEEE, Cong present an unsupervised method for segmenting the illuminant regions and estimating the illumination power spectrum from a single image of a scene lit by multiple light sources. Here, illuminant region segmentation

  4. Colour Constancy for Scenes with Varying Illumination

    E-print Network

    Funt, Brian

    Colour Constancy for Scenes with Varying Illumination Kobus Barnard1, Graham Finlayson2, and Brian surface reflectance and illumination variation to solve for colour constancy. Most colour constancy algorithms assume that the illumination across a scene is constant, but this is very often not valid for real

  5. Linear Parameter Varying control of a quadrotor

    Microsoft Academic Search

    Samarathunga L. M. D. Rangajeeva; James F. Whidborne

    2011-01-01

    control has been lost [4]. In order to extend the flight envelope a common approach is gain scheduling. In which several linear models of the quadrotor are obtained for different trim points and then number of Liner Time Invariant (LTI) controllers are derived for each point. As operating conditions vary, the global controller is estimated by interpolating gains of the

  6. Venturi Tube with Varying Mass Flow

    NASA Technical Reports Server (NTRS)

    Regenscheit, B.

    1948-01-01

    Measurements on three tubes with flow regulated by suction at the trainling edge of the tube are described. It was possible to vary the mass of air flowing through the tube over a large range. Such tubes could be used for shrouded propellers.

  7. Cosmology with Time-Varying G

    Microsoft Academic Search

    Antonio Alfonso-Faus

    1986-01-01

    It is shown that a Universe with a time-varying gravitational ``constant'' G necessarily implies creation if the rest mass of matter particles m p is constant. In this case, from Einstein's field equations, the conditions for energy-momentum propagation are ? ·( GT mu v ) from which matter and photon propagation equations are derived. Free matter particle propagation is not

  8. ICAPM with time-varying risk aversion

    Microsoft Academic Search

    Paulo Maio

    2007-01-01

    A derivation of the ICAPM in a very general framework and previous theoretical work, argue for the relative risk aversion (RRA) coefficient to be both time-varying and countercyclical. The variables that represent proxies for the cyclical component of RRA are the market dividend yield, default spread, smoothed earnings yield and industrial production growth, all being highly correlated with the business

  9. The pricing of time-varying beta

    Microsoft Academic Search

    Gloria González-Rivera

    1997-01-01

    We generalize an asset pricing model based on the Arbitrage Pricing Theory (APT) allowing beta to be time-varying. Making beta a random variable adds flexibility to the model because permits a non-linear relation between individual returns and the set of factors, and accounts for the effect of possible omitted variables. We integrate the conditional APT with a general linear stochastic

  10. Influence of sociodemographics on human mobility.

    PubMed

    Lenormand, Maxime; Louail, Thomas; Cantú-Ros, Oliva G; Picornell, Miguel; Herranz, Ricardo; Arias, Juan Murillo; Barthelemy, Marc; Miguel, Maxi San; Ramasco, José J

    2015-01-01

    Human mobility has been traditionally studied using surveys that deliver snapshots of population displacement patterns. The growing accessibility to ICT information from portable digital media has recently opened the possibility of exploring human behavior at high spatio-temporal resolutions. Mobile phone records, geolocated tweets, check-ins from Foursquare or geotagged photos, have contributed to this purpose at different scales, from cities to countries, in different world areas. Many previous works lacked, however, details on the individuals' attributes such as age or gender. In this work, we analyze credit-card records from Barcelona and Madrid and by examining the geolocated credit-card transactions of individuals living in the two provinces, we find that the mobility patterns vary according to gender, age and occupation. Differences in distance traveled and travel purpose are observed between younger and older people, but, curiously, either between males and females of similar age. While mobility displays some generic features, here we show that sociodemographic characteristics play a relevant role and must be taken into account for mobility and epidemiological modelization. PMID:25993055

  11. Mobile medical device connectivity: real world solutions.

    PubMed

    Pettus, Dan

    2004-01-01

    Mobile medical devices, such as infusion pumps, provide an important therapeutic function. They are also valuable sources of information about treatment patterns at the point of care. However, these mobile devices have been independent islands of valuable information, unable to share the data they gather with other hospital information resources on a real time basis. Although data from these devices can provide significant improvements for medical safety and vital information needed for clinical best practice development, gathering that data poses significant challenges when interfacing with hospital information systems. Mobile medical devices move from place to place as independent actors, raising a series of security and identification issues when they need to be disconnected and reconnected using traditional tethered cable connections. The continuing lack of accepted communications protocol standards, in spite of the concentrated efforts of organizations like the IEEE and the Medical Information Bus (IEEE 1073) to establish them, has made integration into the hospital information system a complex and non-standard task. The rapid spread in availability and adoption of high-speed 802.11 wireless systems in hospitals offers a realistic connectivity solution for mobile medical devices. Inspite of this, the 802.11 standard is still evolving, and current security methods designed for user-based products like PDAs and laptop computers are not ideal for unmanned mobile medical devices because they assume the availability of a human operator to authenticate a wireless session. In the absence of accepted standards, manufacturers have created practical and innovative solutions to support the collection of clinical data from mobile medical devices and the integration of that data with hospital information systems. This paper will explore the potential benefits of integrating mobile medical devices into the hospital information system, and describe the challenges in developing connectivity for such system based on actual experience with the implementation of wired, wireless, and hybrid systems in active medical environments. PMID:17271027

  12. Assessment of Renewable Energy Technology and a Case of Sustainable Energy in Mobile Telecommunication Sector

    PubMed Central

    Okundamiya, Michael S.; Emagbetere, Joy O.; Ogujor, Emmanuel A.

    2014-01-01

    The rapid growth of the mobile telecommunication sectors of many emerging countries creates a number of problems such as network congestion and poor service delivery for network operators. This results primarily from the lack of a reliable and cost-effective power solution within such regions. This study presents a comprehensive review of the underlying principles of the renewable energy technology (RET) with the objective of ensuring a reliable and cost-effective energy solution for a sustainable development in the emerging world. The grid-connected hybrid renewable energy system incorporating a power conversion and battery storage unit has been proposed based on the availability, dynamism, and technoeconomic viability of energy resources within the region. The proposed system's performance validation applied a simulation model developed in MATLAB, using a practical load data for different locations with varying climatic conditions in Nigeria. Results indicate that, apart from being environmentally friendly, the increase in the overall energy throughput of about 4?kWh/$ of the proposed system would not only improve the quality of mobile services, by making the operations of GSM base stations more reliable and cost effective, but also better the living standards of the host communities. PMID:24578673

  13. Rapid Mobility of Mobile IP over WLAN Jun Tian and Abdelsalam (Sumi) Helal

    E-print Network

    Helal, Abdelsalam

    . A person can drive a car on high way at speed of #12;2 12km/h. High speed trains such as France TGV, Japanese bullet, German maglev can travel at speeds of over 320km/h. Could those people surf the internet

  14. Components in time-varying graphs

    NASA Astrophysics Data System (ADS)

    Nicosia, Vincenzo; Tang, John; Musolesi, Mirco; Russo, Giovanni; Mascolo, Cecilia; Latora, Vito

    2012-06-01

    Real complex systems are inherently time-varying. Thanks to new communication systems and novel technologies, today it is possible to produce and analyze social and biological networks with detailed information on the time of occurrence and duration of each link. However, standard graph metrics introduced so far in complex network theory are mainly suited for static graphs, i.e., graphs in which the links do not change over time, or graphs built from time-varying systems by aggregating all the links as if they were concurrent in time. In this paper, we extend the notion of connectedness, and the definitions of node and graph components, to the case of time-varying graphs, which are represented as time-ordered sequences of graphs defined over a fixed set of nodes. We show that the problem of finding strongly connected components in a time-varying graph can be mapped into the problem of discovering the maximal-cliques in an opportunely constructed static graph, which we name the affine graph. It is, therefore, an NP-complete problem. As a practical example, we have performed a temporal component analysis of time-varying graphs constructed from three data sets of human interactions. The results show that taking time into account in the definition of graph components allows to capture important features of real systems. In particular, we observe a large variability in the size of node temporal in- and out-components. This is due to intrinsic fluctuations in the activity patterns of individuals, which cannot be detected by static graph analysis.

  15. Mobile learning in medicine

    NASA Astrophysics Data System (ADS)

    Serkan Güllüoü?lu, Sabri

    2013-03-01

    This paper outlines the main infrastructure for implicating mobile learning in medicine and present a sample mobile learning application for medical learning within the framework of mobile learning systems. Mobile technology is developing nowadays. In this case it will be useful to develop different learning environments using these innovations in internet based distance education. M-learning makes the most of being on location, providing immediate access, being connected, and acknowledges learning that occurs beyond formal learning settings, in places such as the workplace, home, and outdoors. Central to m-learning is the principle that it is the learner who is mobile rather than the device used to deliver m learning. The integration of mobile technologies into training has made learning more accessible and portable. Mobile technologies make it possible for a learner to have access to a computer and subsequently learning material and activities; at any time and in any place. Mobile devices can include: mobile phone, personal digital assistants (PDAs), personal digital media players (eg iPods, MP3 players), portable digital media players, portable digital multimedia players. Mobile learning (m-learning) is particularly important in medical education, and the major users of mobile devices are in the field of medicine. The contexts and environment in which learning occurs necessitates m-learning. Medical students are placed in hospital/clinical settings very early in training and require access to course information and to record and reflect on their experiences while on the move. As a result of this paper, this paper strives to compare and contrast mobile learning with normal learning in medicine from various perspectives and give insights and advises into the essential characteristics of both for sustaining medical education.

  16. Residential Mobility and Migration

    NSDL National Science Digital Library

    Crowder, Kyle

    In this module you will have the opportunity to explore the frequency of different types of residential moves carried out by Americans. You will examine some of the basic determinants of residential mobility by looking at variations in different types of mobility by age, marital status, education, and housing tenure. Finally, you will have an opportunity to test hypotheses, drawn from a popular theoretical perspective, about racial differences in residential mobility.

  17. Mobile computing in critical care.

    PubMed

    Lapinsky, Stephen E

    2007-03-01

    Handheld computing devices are increasingly used by health care workers, and offer a mobile platform for point-of-care information access. Improved technology, with larger memory capacity, higher screen resolution, faster processors, and wireless connectivity has broadened the potential roles for these devices in critical care. In addition to the personal information management functions, handheld computers have been used to access reference information, management guidelines and pharmacopoeias as well as to track the educational experience of trainees. They can act as an interface with a clinical information system, providing rapid access to patient information. Despite their popularity, these devices have limitations related to their small size, and acceptance by physicians has not been uniform. In the critical care environment, the risk of transmitting microorganisms by such a portable device should always be considered. PMID:17371745

  18. Rapid Prototyping Home Page

    NSDL National Science Digital Library

    This resource provides the latest developments in the fast paced field of rapid prototyping. What is rapid prototyping? Rapid prototyping takes virtual designs from computer aided design (CAD) or animation modeling software, transforms them into thin, virtual, horizontal cross-sections and then creates each cross-section in physical space, one after the next until the model is finished. It is a "WYSIWYG" process where the virtual model and the physical model correspond almost identically. With additive fabrication, the machine reads in data from a CAD drawing and lays down successive layers of liquid, powder, or sheet material, and in this way builds up the model from a series of cross sections. These layers, which correspond to the virtual cross section from the CAD model, are joined together or fused automatically to create the final shape. The primary advantage to additive fabrication is its ability to create almost any shape or geometric feature. This site has a great list of links.

  19. M-Trust: A Trust Management Scheme for Mobile P2P Networks

    Microsoft Academic Search

    Basit Qureshi; Geyong Min; Demetres D. Kouvatsos

    2010-01-01

    The rapid growth of emerging techniques for mobile resource sharing, content sharing, mobile social networks, and complex cyber-physical systems poses significant challenges for trust and security management. Several trust management schemes have been proposed recently to counter the security threat on Peer-to-Peer (P2P) systems. However, due to the difficulties caused by system mobility, wireless communications, pervasive devices and dynamic network

  20. Energy locality: processing\\/communication\\/interface tradeoffs to optimize energy in mobile systems

    Microsoft Academic Search

    D. Siewiorek

    2001-01-01

    Summary form only given, as follows. As computers continue to shrink, research and commercial interest in mobile\\/wearable computing is rapidly growing. Unlike traditional desktop computing in which the user is required to come to the computer, mobile computing brings the computer to the user. Mobile\\/wearable computers represent the next evolutionary step in the trend toward more people-centric computing. One of

  1. Deterministic Computations in Time-Varying Graphs: Broadcasting under Unstructured Mobility

    E-print Network

    Boyer, Edmond

    . on Structural Information and Communication Complexity (SIROCCO), volume 5869 of LNCS, pages 126­140, 2009. hal, and N. Santoro. Mapping an unfriendly subway system. In Proc. 5th International Conference on Fun model from real user traces. In Pro- ceedings of IEEE Infocom, volume 6, pages 1­13. Citeseer, 2006. 19

  2. Effects of cross slopes and varying surface characteristics on the mobility of manual wheelchair users.

    PubMed

    Cooper, R A; Molinero, A M; Souza, A; Collins, D M; Karmarkar, A; Teodorski, E; Sporner, M

    2012-01-01

    Surface characteristics of a cross slope can impact the ease with which a manual wheelchair (MWC) user propels across a surface. The purpose of this research was two-fold. Phase I of this research surveyed MWC users to identify cross slope scenarios that they reported to be more difficult to traverse compared to other common driving obstacles. Our survey results showed that, overall, cross slopes were harder to propel across than narrow and manual doors, and cross-slopes in inclement weather conditions were equal or more difficult than gravel and rough-surfaces. Cross slopes with severe angles and those with compound angles (slope with cross-slope) were the most difficult to traverse. Phase II focused on identifying the responses (e.g., avoid, explore alternative, experience a sense of insecurity, no effect) people had when viewing pictures of various cross-slopes scenarios (e.g., narrow space, compound angles, extreme weather) that wheelchair users encounter. These results showed that people reported that they would avoid or feel insecure on some cross-sloped surfaces, like the weather, that are not within our control, others, like compound angle and curb-cuts on slopes, that can be addressed in the construction of pathways or sidewalks. PMID:22876732

  3. OBSERVING PROCESSES THAT VARY IN TIME AND SPACE WITH HETEROGENEOUS MOBILE NETWORKS

    Microsoft Academic Search

    JAMES G. BELLINGHAM; YANWU ZHANG

    The design of a multiplatform ocean observing system involves a variety of decisions, from determining the mix of observational assets, to selecting survey strategies that optimize the effectiveness of the collective system. The challenge is to make the most effective use of available observational tools given the physics of the phenomena under study and the constraints of the platforms and

  4. Control of Multi-Node Mobile Communications Networks with Time Varying Channels via

    E-print Network

    Methods Harold J. Kushner Applied Mathematics Dept. Brown University Providence RI 02912 USA hjk@dam if the links are subject to failure. Comments on the few changes needed for the non-unique route case

  5. From calls to communities: a model for time varying social networks

    E-print Network

    Laurent, Guillaume; Karsai, Márton

    2015-01-01

    Social interactions vary in time and appear to be driven by intrinsic mechanisms, which in turn shape the emerging structure of the social network. Large-scale empirical observations of social interaction structure have become possible only recently, and modelling their dynamics is an actual challenge. Here we propose a temporal network model which builds on the framework of activity-driven time-varying networks with memory. The model also integrates key mechanisms that drive the formation of social ties - social reinforcement, focal closure and cyclic closure, which have been shown to give rise to community structure and the global connectedness of the network. We compare the proposed model with a real-world time-varying network of mobile phone communication and show that they share several characteristics from heterogeneous degrees and weights to rich community structure. Further, the strong and weak ties that emerge from the model follow similar weight-topology correlations as real-world social networks, i...

  6. Rapid road repair vehicle

    DOEpatents

    Mara, Leo M. (Livermore, CA)

    1999-01-01

    Disclosed are improvments to a rapid road repair vehicle comprising an improved cleaning device arrangement, two dispensing arrays for filling defects more rapidly and efficiently, an array of pre-heaters to heat the road way surface in order to help the repair material better bond to the repaired surface, a means for detecting, measuring, and computing the number, location and volume of each of the detected surface imperfection, and a computer means schema for controlling the operation of the plurality of vehicle subsystems. The improved vehicle is, therefore, better able to perform its intended function of filling surface imperfections while moving over those surfaces at near normal traffic speeds.

  7. Sales Communications in a Mobile World: Using the Latest Technology and Retaining the Personal Touch

    ERIC Educational Resources Information Center

    Norris, Daniel T.

    2007-01-01

    Salespeople increasingly have the opportunity to use technology to more quickly communicate with a larger number of clients and customers. Mobile technology, in particular, gives salespeople many advantages in rapidly reaching a large customer base. Furthermore, customers are increasingly employing mobile technology, making them increasingly…

  8. Evaluation Of Dynamic Pricing In Mobile Communication Systems Elena Fitkov-Norris and Ahmad Khanifar

    E-print Network

    Haddadi, Hamed

    installation of new infrastructure. While such strategies enable the networks to meet peak-hour demand optimisation. 1. Introduction. The mobile cellular telephony market has expanded rapidly over the past decade. In the UK, at the end of the first quarter of 1999, mobile phone penetration was almost 30% - up by 5

  9. Goals and challenges of the DARPA GloMo program [global mobile information systems

    Microsoft Academic Search

    B. M. Leiner; R. J. Ruther; A. R. Sastry

    1996-01-01

    Continuing advances in high-speed computation, signal processing, and miniaturization are opening up new opportunities for advancing the state of the art in mobile, wireless, multimedia information systems technologies. Such technologies are critical to meeting the defense requirements for rapidly deployable and robust information systems. The Defense Advanced Research Projects Agency (DARPA) initiated the Global Mobile Information Systems (GloMo) program in

  10. Poster: the development of a semantic feature analysis based mobile application for individuals with aphasia

    Microsoft Academic Search

    Conor Higgins; Áine Kearns; Sue Franklin

    2012-01-01

    We present a Semantic Feature Analysis based mobile application and paired web application, which have been developed in order to facilitate speech and language therapy with a Person with Aphasia (PWA). The goal of this research is to streamline current speech and language therapy practices, by enabling rapid data entry, aggregation and remote analysis. The mobile application has been developed

  11. Offline web application and quiz synchronization for e-learning activity for mobile browser

    Microsoft Academic Search

    Royyana M. Ijtihadie; Yoshifumi Chisaki; Tsuyoshi Usagawa; H. B. Cahyo; Achmad Affandi

    2010-01-01

    Rapid growing of internet applications and users has led the improvement of mobile web browser technology and standards such as HTML5. Recently, HTML5 is turning to be a de facto standard after some of its features has been implemented in major mobile web browsers. Moodle as a web based Learning Management System (LMS) has been popular in academic environment for

  12. Mobile Cloud Computing: Resource Discovery, Session Connectivity and Other Open Issues

    Microsoft Academic Search

    Markus Schüring; Georgios Karagiannis

    2011-01-01

    Abstract:Cloud computing can be considered as a model that provides network access to a shared pool of resources, such as storage and computing power, which can be rapidly provisioned and released with minimal management effort. This paper describes a research activity in the area of mobile cloud computing. It highlights different open issues which are associated with the mobile usage

  13. Query Processing for Mobile Wireless Sensor Networks: State-of-the-art and Research Challenges

    E-print Network

    Newcastle upon Tyne, University of

    REPORT SERIES No. CS-TR-1067 February, 2008 Query Processing for Mobile Wireless Sensor Networks: State OF NEWCASTLE UPON TYNE Computing Science. Technical Report Series. CS-TR-1067 Abstract The rapid advancementCOMPUTING SCIENCE Query Processing for Mobile Wireless Sensor Networks: State

  14. A Study on Jabber-based Instant Messaging System for Mobile Networks

    Microsoft Academic Search

    Yunxiang Gao; Chuangbai Xiao; Chaoqin Gao; Huiguang Chen

    2008-01-01

    With the rapid advancement of wireless network technologies, Mobile Instant Messaging (IM) has become a major application in the telecommunications industry. Firstly, this paper introduces recent research and development efforts in constructing mobile IM systems. Secondly, it advances a new service model and implementation mechanism based on Jabber\\/XMPP. The communication protocol of our system provides an open, expandable, real-time communication

  15. Performance Evaluation of Mobile Agent-based Dynamic Load Balancing Algorithm

    Microsoft Academic Search

    MAGDY SAEB; CHERINE FATHY

    The proliferation of heterogeneity of today's network and the rapid development in wireless networks has raised an urgent requirement for a new communication paradigm. The Mobile agent paradigm is a promising technique that addresses the client-server limitations in network management applications. This paradigm helps to alleviate bandwidth limitations and supports disconnected operations that are significant problems in wireless and mobile

  16. uLearn: Facilitating Ubiquitous Learning through Camera Equipped Mobile Phones

    Microsoft Academic Search

    Keith Mitchell; Nicholas J. P. Race

    2005-01-01

    This paper describes a prototype application based on smartphone devices which supports independent learners within a mobile environment. The techniques employed allow children to rapidly gain access to a large repository of multimedia information through the use of a camera equipped mobile phone or smartphone. More specifically, the use of visual codes (Rohs M. et al., 2004) attached to locations

  17. Peptide mobility and peptide mapping in capillary zone electrophoresis

    Microsoft Academic Search

    George M Janini; Climaco J Metral; Haleem J Issaq; Gary M Muschik

    1999-01-01

    The electrophoretic mobilities of 58 peptides that varied in size from 2 to 39 amino acids and varied in charge from 0.65 to 7.82 are presented. The measurements were conducted at 22°C using a 10% linear polyacrylamide-coated column and a 50 mM phosphate buffer at pH 2.5. Excellent separation of peptides and highly reliable peptide maps of protein digests are

  18. Quantitative experiences in bidirectional mobile to mobile audio & video streaming

    Microsoft Academic Search

    S. E. Davies; S. Gardner; D. L. Jones

    2007-01-01

    There are a number of internet-based video streaming products and several mobile video streaming technologies currently available. However, little has been specifically developed for mobile-to-mobile video streaming using the Internet Protocol (IP). This paper discusses some currently available technical implementations in mobile peer-to-peer (P2P) video streaming. These technologies will be compared with respect to their mobile-to-mobile video performance in a

  19. Predictive location-based QoS routing in mobile ad hoc networks

    Microsoft Academic Search

    Samarth H. Shah; Klara Nahrstedt

    2002-01-01

    In mobile ad hoc networks, the locations and resource-richness of mobile nodes vary dynamically. The information used for routing by traditional routing protocols becomes obsolete due to node mobility. To overcome this problem, a predictive location-based QoS routing scheme is needed. We present a location-delay prediction scheme, based on a location-resource update protocol, which assists a QoS routing protocol. Simulation

  20. Learning Time-Varying Coverage Functions

    PubMed Central

    Du, Nan; Liang, Yingyu; Balcan, Maria-Florina; Song, Le

    2015-01-01

    Coverage functions are an important class of discrete functions that capture the law of diminishing returns arising naturally from applications in social network analysis, machine learning, and algorithmic game theory. In this paper, we propose a new problem of learning time-varying coverage functions, and develop a novel parametrization of these functions using random features. Based on the connection between time-varying coverage functions and counting processes, we also propose an efficient parameter learning algorithm based on likelihood maximization, and provide a sample complexity analysis. We applied our algorithm to the influence function estimation problem in information diffusion in social networks, and show that with few assumptions about the diffusion processes, our algorithm is able to estimate influence significantly more accurately than existing approaches on both synthetic and real world data. PMID:25960624

  1. Force Measurements of a varying camber hydrofoil

    NASA Astrophysics Data System (ADS)

    Najdzin, Derek; Bardet, Philippe M.; Leftwich, Megan C.

    2013-11-01

    The swimming motion of cetaceans (dolphins, whales) is capable of producing large amounts of thrust as observed in nature. This project aims to determine the propulsive efficiency of this swimming motion through force and power measurements. A mechanism was constructed to replicate this motion by applying a combination of pitching and heaving motions to a varying camber hydrofoil. A novel force balance allows the measurement of three direction force and moments as the fin oscillates. A range of Reynolds and Strouhal numbers were tested to identify the most efficient conditions. Allowing the camber of the hydrofoil to vary has shown to increase lift generated, while generating similar thrust forces when compared to a constant camber hydrofoil.

  2. Varying potential silicon carbide gas sensor

    NASA Technical Reports Server (NTRS)

    Shields, Virgil B. (Inventor); Ryan, Margaret A. (Inventor); Williams, Roger M. (Inventor)

    1997-01-01

    A hydrocarbon gas detection device operates by dissociating or electro-chemically oxidizing hydrocarbons adsorbed to a silicon carbide detection layer. Dissociation or oxidation are driven by a varying potential applied to the detection layer. Different hydrocarbon species undergo reaction at different applied potentials so that the device is able to discriminate among various hydrocarbon species. The device can operate at temperatures between 100.degree. C. and at least 650.degree. C., allowing hydrocarbon detection in hot exhaust gases. The dissociation reaction is detected either as a change in a capacitor or, preferably, as a change of current flow through an FET which incorporates the silicon carbide detection layers. The silicon carbide detection layer can be augmented with a pad of catalytic material which provides a signal without an applied potential. Comparisons between the catalytically produced signal and the varying potential produced signal may further help identify the hydrocarbon present.

  3. Mobile Agent System Architecture for Supporting Mobile Market Application Service in Mobile Computing Environment

    Microsoft Academic Search

    Phyoung Jung Kim; Young Ju Noh

    2003-01-01

    Mobile application can be defined as an Internet application that fits well in the mobile computing environment. Mobile agent systems can supports more efficient execution in the mobile computing environments although its environment having wireless network can cause signal disturbance, spurious disconnection by handoff, voluntary disconnection to use power efficiently, and unpredictable transmission error, etc. For the mobile application surrounded

  4. VSS observer for linear time varying system

    Microsoft Academic Search

    Hideki Hashimoto; V. I. Utkin; J.-X. Xu; H. Suzuki; F. Harashima

    1990-01-01

    The problem of designing an observer for state estimation using variable structure system (VSS) theory is discussed. The theory and design principles for linear time-varying systems are presented. The observer is constructed by introducing a block-observable from which is similar to a lower triangular matrix. The convergence of the observer is guaranteed by a sliding mode with first-order filter. Simulation

  5. Biorthogonal frequency-varying modulated lapped transform

    Microsoft Academic Search

    Yixin Gao; Guizhong Liu

    2009-01-01

    In this paper we introduce a biorthogonal frequency-varying modulated lapped transform (BFV-MLT) with flexible tiling behavior of time-frequency plane and attenuation of ringing artifacts. Biorthogonality allows accessorial freedom in designing the analysis and synthesis filter-banks and FVMLT provides nonuniform decomposition of signals with ideal time or frequency resolutions. By constructing a new approach to FV-MLT, we incorporate biorthogonality into FV-MLT

  6. Cosmology with time-varying G

    Microsoft Academic Search

    Antonio Alfonso-Faus

    1986-01-01

    It is shown that a Universe with a time-varying gravitational “constant”G necessarily implies creation if the rest mass of matter particlesmp is constant. In this case, from Einstein's field equations, the conditions for energy-momentum propagation are ? ·(GTµv) from which matter and photon propagation equations are derived. Free matter particle propagation is not affected by creation that is given byGNpmp=const,

  7. Extending Activity Diagrams to Model Mobile Hubert Baumeister, Nora Koch, Piotr Kosiuczenko, and Martin Wirsing

    E-print Network

    Baumeister, Hubert

    virtual locations for administrative domains, fire-walls, physical locations for computing devices and more inter- est. Code mobility emerged in some scripting languages for controlling network applications-constraints. Furthermore, we introduce two variants of activity diagrams for modeling mobility. The first vari- ant

  8. There is more to Context than Location Environment Sensing Technologies for Adaptive Mobile User Interfaces

    Microsoft Academic Search

    Albrecht Schmidt; Michael Beigl

    In this paper we analyze the usage of sensors to improve application of ultra-portable mobile devices, such as personal digital assistants (PDAs), wearable computers, or mobile phones. Ultra-portable devices are characterized by being operational while on the move, and have in common that they are used for different tasks as well as in varying environments and situations. We discuss the

  9. WIRELESS COMMUNICATIONS AND MOBILE COMPUTING Wirel. Commun. Mob. Comput. 2010; 10:547558

    E-print Network

    Jiang, Hai

    because of the time-varying network topology and propagation loss between any two nodes. QoS support access in an orderly manner among the mobile nodes such that efficiency can be achieved. Here, we focusWIRELESS COMMUNICATIONS AND MOBILE COMPUTING Wirel. Commun. Mob. Comput. 2010; 10:547­558 Published

  10. Development of Assistive Mobile Robots Helping the Disabled Work in a Factory Environment

    Microsoft Academic Search

    Jung Won Kang; Bong Sung Kim; Myung Jin Chung

    2008-01-01

    This paper introduces assistive mobile robots that help the disabled to work in a factory environment. The target users and the functions of the robot were determined based on varied survey results. The robots were developed through an iterative process of designing, development and evaluation. As a result, three assistive mobile robots were developed. The first version of the robot

  11. Investigating microphone efficacy for facilitation of mobile speech-based data entry

    Microsoft Academic Search

    Joanna Lumsden; Irina Kondratova; Scott Durling

    2007-01-01

    Despite being nominated as a key potential interaction technique for supporting today's mobile technology user, the widespread commercialisation of speech-based input is currently being impeded by unacceptable recognition error rates. Developing effective speech-based solutions for use in mobile contexts, given the varying extent of background noise, is challenging. The research presented in this paper is part of an ongoing investigation

  12. The Use of A Mobile Sink for Quality Data Collection in Energy Harvesting Sensor Networks

    E-print Network

    Liang, Weifa

    The Use of A Mobile Sink for Quality Data Collection in Energy Harvesting Sensor Networks Xiaojiang collection in an energy harvesting sensor network where sensors are deployed along a given path and a mobile are powered by renew- able energy sources, the time-varying characteristics of energy harvesting poses great

  13. Jrl Syst Sci & Complexity (2007) 20: 215224 HARD DISK DRIVES CONTROL IN MOBILE

    E-print Network

    Ge, Shuzhi Sam

    2007-01-01

    Jrl Syst Sci & Complexity (2007) 20: 215­224 HARD DISK DRIVES CONTROL IN MOBILE APPLICATIONS Shuzhi, LLC Abstract In this paper, control design is investigated for hard disk drives in mobile applications studies. Key words Hard disk drives, time-varying disturbances. 1 Introduction Recently, hard disk drives

  14. SPECIATION, MOBILITY AND FATE OF ACTINIDES IN THE GROUNDWATER AT THE HANFORD SITE

    EPA Science Inventory

    Plutonium mobility varies depending upon source and ambient geochemistry. Some forms may be significantly more mobile than standard models predict. Because of this variability, the first step in safe remediation and contaminant management in the groundwater/vadose zone is to meas...

  15. Neutron irradiation effects on domain wall mobility and reversibility in lead zirconate titanate thin films

    E-print Network

    Ferreira, Paulo J.

    Neutron irradiation effects on domain wall mobility and reversibility in lead zirconate titanate mobility and reversibility in lead zirconate titanate thin films Joseph T. Graham,1,2,a) Geoff L. Brennecka lead zirconate titanate (PZT) were investigated. Two sets of PbZr0:52Ti0:48O3 films of varying initial

  16. Rapid metal tooling

    Microsoft Academic Search

    F. Klocke; T. Celiker; Y.-A. Song

    1995-01-01

    The materials which can currently be processed using commercially available rapid prototyping techniques have limited mechanical characteristics. Describes research into two processes which offer metal part capabilities, namely selective laser sintering and laser generating. Pays particular attention to the selection of suitable materials. Discusses the application of these techniques to the manufacture of metal tools.

  17. How rapidly advancing nations

    E-print Network

    their nations' competitiveness in the global economy and to improve the internal opera- tions of public agencies international compe- tition for such resources as skilled labor, investment funds and trade. ICT has clearly for Rapid Adopter nations to become more competitive in the world economy. Countries in this tier need

  18. Enhancing mobile browsing and reading

    E-print Network

    Yu, Chen-Hsiang

    Although the web browser has become a standard interface for information access on the Web, the mobile web browser on the smartphone does not hold the same interest to mobile users. A survey with 11 mobile users shows that ...

  19. Mobile Apps for Librarians

    ERIC Educational Resources Information Center

    Power, June L.

    2013-01-01

    In an increasing mobile environment, library and reading-related activities often take place on a phone or tablet device. Not only does this mean that library Web sites must keep mobile navigability in mind, but also develop and utilize apps that allow patrons to interact with information and with libraries. While apps do not serve every purpose,…

  20. Specifying Secure Mobile Applications

    Microsoft Academic Search

    Andrew Phillips; Susan Eisenbach; Bashar Nuseibeh; Nobuko Yoshida

    Ambient calculi are a promising formalism for specifying mo- bile computation, which benefit from a range of analysis techniques. How- ever, Ambient calculi have been designed mostly as minimal models for mobility, rather than as specification languages for mobile applications. This paper describes a variant of Ambients, the Channel Ambient calcu- lus, which is designed to be at a level

  1. Mastering Mobile Security

    ERIC Educational Resources Information Center

    Panettieri, Joseph C.

    2007-01-01

    Without proper security, mobile devices are easy targets for worms, viruses, and so-called robot ("bot") networks. Hackers increasingly use bot networks to launch massive attacks against eCommerce websites--potentially targeting one's online tuition payment or fundraising/financial development systems. How can one defend his mobile systems against…

  2. Smart Mobility Dutch Automotive

    E-print Network

    Franssen, Michael

    Smart Mobility #12;Dutch Automotive Industry 300 companies 45k employees 17B revenue #12;Dutch Automotive Industry Focus area's: · Vehicle efficiency · Cooperative Mobility #12;Freedom, prosperity, fun;Automotive Technology Car as sustainable zero emission vehicles #12;Automotive Technology Electromagnetic car

  3. SantanderMobility Scholarships

    E-print Network

    Anderson, Jim

    SantanderMobility Scholarships #12;The University of Southampton signed an agreement with Santander Universities in May 2008. As a result of this partnership we have implemented various scholarship schemes for students including a new scholarship for UK students going overseas on exchange and mobility programmes

  4. Mobile Sites Style Guide

    Cancer.gov

    U.S. DEPARTMENT OF HEALTH AND HUMAN SERVICES National Instit?tes of Health National Cancer Instit?te NCI Mobile Sites St?le Guide Version 1.0 Table of Con?en?s 2 01. Mobile 01.1 Branding and Required Content 01.2 Branding: Backgrounds 01.3 Branding:

  5. Improving mobile internet usability

    Microsoft Academic Search

    George Buchanan; Sarah Farrant; Matt Jones; Harold W. Thimbleby; Gary Marsden; Michael J. Pazzani

    2001-01-01

    Mobile internet technologies, such as WAP, are important for pervasive, anytime, anywhere computing. Although much progress has been made in terms of technological innovation, many of mobile internet systems are difficult to use, lack flexibility and robustness. They give a poor user experience. Evaluation and theoretical analysis of usability combined with innovative design can achieve significant improvements in user performance

  6. Mobility control agent

    SciTech Connect

    Argabright, P.A.; Phillips, B.L.; Rhudy, J.S.

    1983-05-17

    Polymer mobility control agents useful in supplemental oil recovery processes, which give improved reciprocal relative mobilities, are prepared by initiating the polymerization of a monomer containing a vinyl group with a catalyst comprising a persulfate and ferrous ammonium sulfate. The vinyl monomer is an acrylyl, a vinyl cyanide, a styryl and water soluble salts thereof.

  7. Mobile Christian - shuttle flight

    NASA Technical Reports Server (NTRS)

    2009-01-01

    Erin Whittle, 14, (seated) and Brianna Johnson, 14, look on as Louis Stork, 13, attempts a simulated landing of a space shuttle at StenniSphere. The young people were part of a group from Mobile Christian School in Mobile, Ala., that visited StenniSphere on April 21.

  8. Mobile Learning Anytime, Anywhere

    ERIC Educational Resources Information Center

    Hlodan, Oksana

    2010-01-01

    Some educational institutions are taking the leap to mobile learning (m-learning) by giving out free iPods. For example, Abilene Christian University gave iPods or iPhones to freshman students and developed 15 Web applications specifically for the mobile devices. The iPod is not the only ubiquitous m-learning device. Any technology that connects…

  9. Methods development in multimodal chromatography with mobile phase modifiers using the steric mass action model.

    PubMed

    Karkov, Hanne Sophie; Sejergaard, Lars; Cramer, Steven M

    2013-11-29

    The ability to predict downstream protein purification processes is of great value in the biopharmaceutical industry; saving time, cost and resources. While many complex models exist, the appropriate use of simple models can be a useful tool for rapidly designing and optimizing processes as well as for risk analysis and establishing parameter ranges. In this study, the steric mass action isotherm is success-fully employed to predict the chromatographic behavior of a multimodal anionic Capto adhere systemin the presence of various mobile phase modifiers. An experimental protocol consisting of only a few column experiments is shown to be sufficient to establish the model. Proof of concept is carried out using human insulin and bovine serum albumin which have varying degrees of hydrophobicity, charge and size. Finally, the model predictions are verified under various experimental conditions and the unique selectivity of this multimodal system is explored and compared with traditional anion exchange resins.The simple model approach described here represents a rapid and useful method for model based process development of multimodal chromatography. PMID:24354003

  10. [Cognition and mobility].

    PubMed

    Bridenbaugh, Stephanie A

    2015-04-01

    Felix Platter Hospital, University Center for Medicine of Aging, Basel, Switzerland; There is a strong association between cognition and mobility. Older adults with gait deficits have an increased risk of developing cognitive deficits, even dementia. Cognitive deficits, on the other hand, are associated with worsening gait. Cognitive as well as mobility deficits are associated with an increased fall risk. Assessments of cognition, particularly the executive functions, and functional mobility should therefore be an integral part of every comprehensive geriatric assessment. Some quick screening tests for mobility disorders can be performed in a clinical praxis. If those assessments provide pathological results, then consider patient referral for an in-depth gait analysis. Gait analyses that utilize dual task paradigms (walking and simultaneously performing a second task) are particularly meaningful for early detection of mobility and cognitive deficits. Early detection permits timely implementation of targeted interventions to improve gait and brain function. PMID:25791044

  11. Skylab mobile laboratory

    NASA Technical Reports Server (NTRS)

    Primeaux, G. R.; Larue, M. A.

    1975-01-01

    The Skylab mobile laboratory was designed to provide the capability to obtain necessary data on the Skylab crewmen 30 days before lift-off, within 1 hour after recovery, and until preflight physiological baselines were reattained. The mobile laboratory complex consisted of six laboratories that supported cardiovascular, metabolic, nutrition and endocrinology, operational medicine, blood, and microbiology experiments; a utility package; and two shipping containers. The objectives and equipment requirements of the Skylab mobile laboratory and the data acquisition systems are discussed along with processes such as permanently mounting equipment in the individual laboratories and methods of testing and transporting the units. The operational performance, in terms of amounts of data collected, and the concept of mobile laboratories for medical and scientific experiments are evaluated. The Skylab mobile laboratory succeeded in facilitating the data collection and sample preservation associated with the three Skylab manned flights.

  12. Dynamic topography and gravity anomalies for fluid layers whose viscosity varies exponentially with depth

    NASA Technical Reports Server (NTRS)

    Revenaugh, Justin; Parsons, Barry

    1987-01-01

    Adopting the formalism of Parsons and Daly (1983), analytical integral equations (Green's function integrals) are derived which relate gravity anomalies and dynamic boundary topography with temperature as a function of wavenumber for a fluid layer whose viscosity varies exponentially with depth. In the earth, such a viscosity profile may be found in the asthenosphere, where the large thermal gradient leads to exponential decrease of viscosity with depth, the effects of a pressure increase being small in comparison. It is shown that, when viscosity varies rapidly, topography kernels for both the surface and bottom boundaries (and hence the gravity kernel) are strongly affected at all wavelengths.

  13. Networked infomechanical systems: a mobile embedded networked sensor platform

    Microsoft Academic Search

    Richard Pon; Maxim A. Batalin; Jason Gordon; Aman Kansal; Duo Liu; Mohammad H. Rahimi; Lisa Shirachi; Yan Yu; Mark M. Hansen; William J. Kaiser; Mani B. Srivastava; Gaurav S. Sukhatme; Deborah Estrin

    2005-01-01

    Networked Infomechanical Systems (NIMS) introduces a new actuation capability for embedded networked sensing. By exploiting a constrained actuation method based on rapidly deployable infrastructure, NIMS suspends a network of wireless mobile and fixed sensor nodes in three-dimensional space. This permits run-time adaptation with variable sensing location, perspective, and even sensor type. Discoveries in NIMS environmental investigations have raised requirements for

  14. MMM2: mobile media metadata for photo sharing

    Microsoft Academic Search

    Shane Ahern; Simon King; Marc Davis

    2005-01-01

    Though cameraphones are rapidly becoming the dominant platform for consumer digital photography, users still face difficulties in transferring, managing, and sharing photos captured with cameraphones. The Mobile Media Metadata 2 (MMM2) system removes the difficulty in transferring photos from the device by providing an automatic upload capability and uses metadata about the context in which a photo was captured to

  15. The impact of mobile shell materials on SAR

    Microsoft Academic Search

    Mengbi Jin; Zhinong Ying; Sailing He

    2005-01-01

    With the rapid development of the wireless communication technology and the wide use of the mobile phone today, more attentions have been drawn to the biological effects of electromagnetic fields. Specific absorption rate (SAR) has been recognized as one of the most significant variables describing the electromagnetic field interaction with the human body. In this paper, we investigate this problem

  16. Scalable load balancing on distributed web servers using mobile agents

    Microsoft Academic Search

    Jiannong Cao; Yudong Sun; Xianbin Wang; Sajal K. Das

    2003-01-01

    Distributed web servers on the immensely expanding Internet require high scalability and availability to provide efficient services to millions of clients on the web. To provide rapid responses to enormous number of client requests, load balancing is an important technique to evenly distribute the requests to web servers. In this paper, we propose a framework called MALD (Mobile Agent based

  17. Exploiting Parallel Networks in Intermittently-Connected Mobile Environments

    Microsoft Academic Search

    Lara B. Deek; Sarah Thoubian; Serouj Jamijian; Khaled A. Harras; Hassan Artail

    2008-01-01

    The rapid increase and proliferation of mobile wireless technologies has led to the rise of new problems that fall under the umbrella of challenged networks, namely, intermittent network connectivity. This diversity in wireless devices, along with their convergence, has granted users access to multiple heterogeneous networks available in parallel. ?owadays, a user generally expects to be connected in all places

  18. Virtual Credit Cards on Mobile for M-Commerce Payment

    Microsoft Academic Search

    Narongrit Waraporn; Manawat Sithiyavanich; Hathaichanok Jiarawattanasawat; Narin Pakchai

    2009-01-01

    The number of credit companies has been increasing due to the directed and undirected extra incomes from credit card holders. It effects to rapid growing rate of the number of credit card holders. Each individual is holding many credit cards that are harder to manage than before. At the same time, the usage of gadget devices such as mobiles is

  19. Universities and Libraries Move to the Mobile Web

    ERIC Educational Resources Information Center

    Aldrich, Alan W.

    2010-01-01

    The convergence of web-enabled smartphones, the applications designed for smartphone interfaces, and cloud computing is rapidly changing how people interact with each other and with their environments. The commercial sector has taken the lead in creating mobile websites that leverage the capacities of smartphones, and the academic community has…

  20. Inmarsat and personal mobile satellite services

    NASA Astrophysics Data System (ADS)

    McDougal, Patrick; Barendse, Victor

    Personal communications - mobile satellite services (PC-MSS) hold much promise as a profitable business opportunity for a number of interested operators and manufacturers. What will be their impact on the overall mobile communications landscape, and what role will they play in the drive towards the universal personal communicator? It is the thesis of this paper that PC-MSS can provide one of the critical enabling technologies to allow a more rapid, global assimilation of personal mobile communications. Terrestrial mobile communications are local by definition, both in terms of service reach and regulatory oversight. It is estimated that cellular, and other forms of terrestrial mobile communications, will cover over 50% of the world's population, but only 15% of the land mass area by the year 2000. PC-MSS will allow 'cellular extension' to interested users in the uncovered parts of the world. The market opportunity is established and technical solutions are available. However 'user cooperation' will be required and cross mapping of market needs to the technology solutions is the key to financially viable solutions. The potential political and regulatory hurdles are daunting. Inmarsat, as the existing global MSS partnership, is already introducing PC-MSS products and services in the 1990s. The widespread use of briefcase satphones (Inm-M), laptop-sized data terminals (Inm-C), and pocket satpagers (Inm-paging) will break new ground in reshaping the international regulatory context of mobile communications, and in initiating the optimal public switched network integration necessary for global interconnect. It is suggested that this evolutionary approach, by means of international consensus-building within a global partnership of operators, is an effective and proven method to ensure both a sufficient financial return for investors, and fair and equitable access of these services for all countries and users.

  1. Probing charge scattering mechanisms in suspended graphene by varying its dielectric environment.

    PubMed

    Newaz, A K M; Puzyrev, Yevgeniy S; Wang, Bin; Pantelides, Sokrates T; Bolotin, Kirill I

    2012-01-01

    Graphene with high carrier mobility ? is required both for graphene-based electronic devices and for the investigation of the fundamental properties of Dirac fermions. An attractive approach to increase the mobility is to place graphene in an environment with high static dielectric constant ? that would screen the electric field due to the charged impurities present near graphene's surface. Here we investigate the effect of the dielectric environment of graphene and study electrical transport in multi-terminal graphene devices suspended in liquids with ? ranging from 1.9 to 33. For non-polar liquids (?<5), we observe a rapid increase of ?(?), with room-temperature mobility reaching ~60,000 cm(2) Vs(-1) for devices in anisole (? = 4.3). We associate this trend with dielectric screening of charged impurities adsorbed on graphene. We observe much lower mobility ?~20,000 cm(2) Vs(-1) for devices in polar liquids (? ? 18) and explain it by additional scattering caused by ions present in such liquids. PMID:22415825

  2. Linear Parameter Varying Control for Actuator Failure

    NASA Technical Reports Server (NTRS)

    Shin, Jong-Yeob; Wu, N. Eva; Belcastro, Christine; Bushnell, Dennis M. (Technical Monitor)

    2002-01-01

    A robust linear parameter varying (LPV) control synthesis is carried out for an HiMAT vehicle subject to loss of control effectiveness. The scheduling parameter is selected to be a function of the estimates of the control effectiveness factors. The estimates are provided on-line by a two-stage Kalman estimator. The inherent conservatism of the LPV design is reducing through the use of a scaling factor on the uncertainty block that represents the estimation errors of the effectiveness factors. Simulations of the controlled system with the on-line estimator show that a superior fault-tolerance can be achieved.

  3. Mobile Perspectives: On Teaching Mobile Literacy

    ERIC Educational Resources Information Center

    Parry, David

    2011-01-01

    While recognizing that digital access is not evenly distributed in the United States, which is to say nothing of the global distribution, one can safely say that this transformation is already here; people are already at the moment in which the ability to use social media, and particularly social media as amplified through the power of the mobile

  4. The Most General Time-Varying Filter Bank and Time-Varying Lapped Transforms

    Microsoft Academic Search

    Guangyu Wang

    2006-01-01

    In this paper, a model-based method is used to analyze the most general time-varying filter bank, where all parameters in the filter bank change with time, including filter length, decimator factor, and the number of channel. Through modeling the time-varying filter bank at a fixed time point as a time-invariant filter bank, we change the study of the most general

  5. m.Site: Efficient Content Adaptation for Mobile Devices

    E-print Network

    Wang, Haining

    administra- tor visually selects objects within a web page, and assigns one or more attributes to page browser residing on the server to interpose on behalf of a resource-constrained mobile client. Adaptations, due to varying DOM (document object model) imple- mentations within popular web browsers, object

  6. Public School Choice and Student Mobility in Metropolitan Phoenix

    ERIC Educational Resources Information Center

    Powers, Jeanne M.; Topper, Amelia M.; Silver, Michael

    2012-01-01

    Arizona's interdistrict open enrollment and charter schools laws allow families to send their children to the public schools of their choice. We assessed how public school choice affected elementary school enrollments in 27 metropolitan Phoenix school districts. Student mobility rates varied widely between districts and by location. The higher…

  7. Optimized combinations of abatement strategies for urban mobile sources

    Microsoft Academic Search

    Tai-Yi Yu; Yu-Chyang Lin; Len-Fu W. Chang

    2000-01-01

    The maximum incremental reactivity (MIR) scale was chosen as a practical index for quantifying ozone-forming impacts. The integer linear and nonlinear programming techniques were employed as the optimization method to maximize MIR and volatile organic compound (VOC) reductions, and minimize ozone’s marginal cost with varied control costs. Mobile vehicles were divided into nine categories according to the demands of decision

  8. Call Admission Control for Mobile Multimedia Wireless Networks

    Microsoft Academic Search

    Sundus Mahmod; Harsha Sirisena; Krzysztof Pawlikowski

    Call Admission Control (CAC) policies in mobile cellular wireless networks give priority to handoff requests over new call requests. In the guard channel policy, an integer number of channels are reserved for handoff calls, while the fractional guard channel policy rejects new calls with a probability that varies with the current channel occupancy. The effect of reservations on new and

  9. Contour Estimation Using Collaborating Mobile Sensors Sumana Srinivasan

    E-print Network

    Ramamritham, Krithi

    a bounded region of varying pollutant concentration using a network of mobile sensors. Since controlled move in adverse settings such as explosion plumes, oil slicks etc. Consider a pollutant spill in a water body. One, there is a need to es- timate the spatial extents of hazardous areas in the spill as well as track the movement

  10. Ekalavya, Mobile Creches Annual Reports (Bombay) 1981-1982.

    ERIC Educational Resources Information Center

    Swaminathan, Mina, Ed.

    While specific subjects vary, the theme of this collection of seven articles is the nonformal education of adult migrants in India. The first article documents several aspects of adult education activities undertaken by Mobile Creches for Working Mothers' Children, an organization providing integrated day care for the children (from birth through…

  11. Effects of particle shape and mobility on stable armor development

    Microsoft Academic Search

    Basil Gomez

    1994-01-01

    The relative size and roughness of a stable armor varies with particle shape. For a given imposed shear stress the order of increasing nominal particle diameter is flat, angular, and rounded gravel. The order of increasing surface roughness is flat, rounded, and angular gravel. The mobility of fine flat gravel particles is enhanced by the lower surface roughness of armors

  12. Rapidly refuelable fuel cell

    DOEpatents

    Joy, R.W.

    1982-09-20

    A rapidly refuelable dual cell of an electrochemical type is described wherein a single anode cooperates with two cathodes and wherein the anode has a fixed position and the cathodes are urged toward opposite faces of the anodes at constant and uniform force. The associated cathodes are automatically retractable to permit the consumed anode remains to be removed from the housing and a new anode inserted between the two cathodes.

  13. Stereolithography and Rapid Prototyping

    Microsoft Academic Search

    David W. Rosen

    Stereolithography is a “rapid prototyping” or additive manufacturing process that has been used to fabricate 3D and high aspect\\u000a ratio microstructures for customized packaging of microfluidic devices and microsensors. Microstereolithography denotes a\\u000a collection of processes and technologies that can fabricate devices and packages with improved resolution, with features down\\u000a to 1 ?m in size. We show the feasibility of the

  14. Rapid adhesive bonding concepts

    NASA Technical Reports Server (NTRS)

    Stein, B. A.; Tyeryar, J. R.; Hodges, W. T.

    1984-01-01

    Adhesive bonding in the aerospace industry typically utilizes autoclaves or presses which have considerable thermal mass. As a consequence, the rates of heatup and cooldown of the bonded parts are limited and the total time and cost of the bonding process is often relatively high. Many of the adhesives themselves do not inherently require long processing times. Bonding could be performed rapidly if the heat was concentrated in the bond lines or at least in the adherends. Rapid adhesive bonding concepts were developed to utilize induction heating techniques to provide heat directly to the bond line and/or adherends without heating the entire structure, supports, and fixtures of a bonding assembly. Bonding times for specimens are cut by a factor of 10 to 100 compared to standard press bonding. The development of rapid adhesive bonding for lap shear specimens (per ASTM D1003 and D3163), for aerospace panel bonding, and for field repair needs of metallic and advanced fiber reinforced polymeric matrix composite structures are reviewed.

  15. Limits of social mobilization.

    PubMed

    Rutherford, Alex; Cebrian, Manuel; Dsouza, Sohan; Moro, Esteban; Pentland, Alex; Rahwan, Iyad

    2013-04-16

    The Internet and social media have enabled the mobilization of large crowds to achieve time-critical feats, ranging from mapping crises in real time, to organizing mass rallies, to conducting search-and-rescue operations over large geographies. Despite significant success, selection bias may lead to inflated expectations of the efficacy of social mobilization for these tasks. What are the limits of social mobilization, and how reliable is it in operating at these limits? We build on recent results on the spatiotemporal structure of social and information networks to elucidate the constraints they pose on social mobilization. We use the DARPA Network Challenge as our working scenario, in which social media were used to locate 10 balloons across the United States. We conduct high-resolution simulations for referral-based crowdsourcing and obtain a statistical characterization of the population recruited, geography covered, and time to completion. Our results demonstrate that the outcome is plausible without the presence of mass media but lies at the limit of what time-critical social mobilization can achieve. Success relies critically on highly connected individuals willing to mobilize people in distant locations, overcoming the local trapping of diffusion in highly dense areas. However, even under these highly favorable conditions, the risk of unsuccessful search remains significant. These findings have implications for the design of better incentive schemes for social mobilization. They also call for caution in estimating the reliability of this capability. PMID:23576719

  16. Limits of social mobilization

    PubMed Central

    Rutherford, Alex; Cebrian, Manuel; Dsouza, Sohan; Moro, Esteban; Pentland, Alex; Rahwan, Iyad

    2013-01-01

    The Internet and social media have enabled the mobilization of large crowds to achieve time-critical feats, ranging from mapping crises in real time, to organizing mass rallies, to conducting search-and-rescue operations over large geographies. Despite significant success, selection bias may lead to inflated expectations of the efficacy of social mobilization for these tasks. What are the limits of social mobilization, and how reliable is it in operating at these limits? We build on recent results on the spatiotemporal structure of social and information networks to elucidate the constraints they pose on social mobilization. We use the DARPA Network Challenge as our working scenario, in which social media were used to locate 10 balloons across the United States. We conduct high-resolution simulations for referral-based crowdsourcing and obtain a statistical characterization of the population recruited, geography covered, and time to completion. Our results demonstrate that the outcome is plausible without the presence of mass media but lies at the limit of what time-critical social mobilization can achieve. Success relies critically on highly connected individuals willing to mobilize people in distant locations, overcoming the local trapping of diffusion in highly dense areas. However, even under these highly favorable conditions, the risk of unsuccessful search remains significant. These findings have implications for the design of better incentive schemes for social mobilization. They also call for caution in estimating the reliability of this capability. PMID:23576719

  17. Mobile sensing systems.

    PubMed

    Macias, Elsa; Suarez, Alvaro; Lloret, Jaime

    2013-01-01

    Rich-sensor smart phones have made possible the recent birth of the mobile sensing research area as part of ubiquitous sensing which integrates other areas such as wireless sensor networks and web sensing. There are several types of mobile sensing: individual, participatory, opportunistic, crowd, social, etc. The object of sensing can be people-centered or environment-centered. The sensing domain can be home, urban, vehicular… Currently there are barriers that limit the social acceptance of mobile sensing systems. Examples of social barriers are privacy concerns, restrictive laws in some countries and the absence of economic incentives that might encourage people to participate in a sensing campaign. Several technical barriers are phone energy savings and the variety of sensors and software for their management. Some existing surveys partially tackle the topic of mobile sensing systems. Published papers theoretically or partially solve the above barriers. We complete the above surveys with new works, review the barriers of mobile sensing systems and propose some ideas for efficiently implementing sensing, fusion, learning, security, privacy and energy saving for any type of mobile sensing system, and propose several realistic research challenges. The main objective is to reduce the learning curve in mobile sensing systems where the complexity is very high. PMID:24351637

  18. Exploiting Mobility for Trust Propagation in Mobile Ad Hoc Networks

    Microsoft Academic Search

    Ningning Cheng; Kannan Govindan; Prasant Mohapatra

    2011-01-01

    Trust plays an important role in protecting the security of mobile ad hoc networks. The node mobility brings challenge to trust propagation, where traditional graph-based propagation methods are difficult to apply. In this paper, we propose a trust establishment and propagation scheme by ex- ploiting natural mobility of mobile ad hoc network nodes. We estimate the moving state of neighboring

  19. Physical Mobility and Logical Mobility in Ubiquitous Computing Environments

    Microsoft Academic Search

    Ichiro Satoh

    2002-01-01

    This paper presents a framework for building context-aware applica- tions in ubiquitous and mobile computing settings. The framework provides peo- ple, places, and things with computational functionalities to support and annotate them. It is unique among existing systems because the functionalities are imple- mented by mobile agents. Using location-tracking systems, this framework can navigate mobile agents to stationary or mobile

  20. MMPS: A Versatile Mobile-to-Mobile Payment System

    Microsoft Academic Search

    Ashutosh Saxena; Manik Lal Das; Anurag Gupta

    2005-01-01

    The paper presents an effective mobile-to-mobile payment system. A mobile phone with or without SIM card is enabled as an EMV payment instrument and is linked to a debit or credit account in a bank to pay merchant who has a mobile phone or an online EMV capable terminal. In a single phone, multiple credit or debit accounts from different

  1. Stereoscopic depth perception varies with hues

    NASA Astrophysics Data System (ADS)

    Chen, Zaiqing; Shi, Junsheng; Tai, Yonghang; Yun, Lijun

    2012-09-01

    The contribution of color information to stereopsis is controversial, and whether the stereoscopic depth perception varies with chromaticity is ambiguous. This study examined the changes in depth perception caused by hue variations. Based on the fact that a greater disparity range indicates more efficient stereoscopic perception, the effect of hue variations on depth perception was evaluated through the disparity range with random-dot stereogram stimuli. The disparity range was obtained by constant-stimulus method for eight chromaticity points sampled from the CIE 1931 chromaticity diagram. Eight sample points include four main color hues: red, yellow, green, and blue at two levels of chroma. The results show that the disparity range for the yellow hue is greater than the red hue, the latter being greater than the blue hue and the disparity range for green hue is smallest. We conclude that the perceived depth is not the same for different hues for a given size of disparity. We suggest that the stereoscopic depth perception can vary with chromaticity.

  2. MULTIVARIATE VARYING COEFFICIENT MODEL FOR FUNCTIONAL RESPONSES

    PubMed Central

    Zhu, Hongtu; Li, Runze; Kong, Linglong

    2012-01-01

    Motivated by recent work studying massive imaging data in the neuroimaging literature, we propose multivariate varying coefficient models (MVCM) for modeling the relation between multiple functional responses and a set of covariates. We develop several statistical inference procedures for MVCM and systematically study their theoretical properties. We first establish the weak convergence of the local linear estimate of coefficient functions, as well as its asymptotic bias and variance, and then we derive asymptotic bias and mean integrated squared error of smoothed individual functions and their uniform convergence rate. We establish the uniform convergence rate of the estimated covariance function of the individual functions and its associated eigenvalue and eigenfunctions. We propose a global test for linear hypotheses of varying coefficient functions, and derive its asymptotic distribution under the null hypothesis. We also propose a simultaneous confidence band for each individual effect curve. We conduct Monte Carlo simulation to examine the finite-sample performance of the proposed procedures. We apply MVCM to investigate the development of white matter diffusivities along the genu tract of the corpus callosum in a clinical study of neurodevelopment. PMID:23645942

  3. Varying execution discipline to increase performance

    SciTech Connect

    Campbell, P.L.; Maccabe, A.B.

    1993-12-22

    This research investigates the relationship between execution discipline and performance. The hypothesis has two parts: 1. Different execution disciplines exhibit different performance for different computations, and 2. These differences can be effectively predicted by heuristics. A machine model is developed that can vary its execution discipline. That is, the model can execute a given program using either the control-driven, data-driven or demand-driven execution discipline. This model is referred to as a ``variable-execution-discipline`` machine. The instruction set for the model is the Program Dependence Web (PDW). The first part of the hypothesis will be tested by simulating the execution of the machine model on a suite of computations, based on the Livermore Fortran Kernel (LFK) Test (a.k.a. the Livermore Loops), using all three execution disciplines. Heuristics are developed to predict relative performance. These heuristics predict (a) the execution time under each discipline for one iteration of each loop and (b) the number of iterations taken by that loop; then the heuristics use those predictions to develop a prediction for the execution of the entire loop. Similar calculations are performed for branch statements. The second part of the hypothesis will be tested by comparing the results of the simulated execution with the predictions produced by the heuristics. If the hypothesis is supported, then the door is open for the development of machines that can vary execution discipline to increase performance.

  4. Secure steganography designed for mobile platforms

    NASA Astrophysics Data System (ADS)

    Agaian, Sos S.; Cherukuri, Ravindranath; Sifuentes, Ronnie R.

    2006-05-01

    Adaptive steganography, an intelligent approach to message hiding, integrated with matrix encoding and pn-sequences serves as a promising resolution to recent security assurance concerns. Incorporating the above data hiding concepts with established cryptographic protocols in wireless communication would greatly increase the security and privacy of transmitting sensitive information. We present an algorithm which will address the following problems: 1) low embedding capacity in mobile devices due to fixed image dimensions and memory constraints, 2) compatibility between mobile and land based desktop computers, and 3) detection of stego images by widely available steganalysis software [1-3]. Consistent with the smaller available memory, processor capabilities, and limited resolution associated with mobile devices, we propose a more magnified approach to steganography by focusing adaptive efforts at the pixel level. This deeper method, in comparison to the block processing techniques commonly found in existing adaptive methods, allows an increase in capacity while still offering a desired level of security. Based on computer simulations using high resolution, natural imagery and mobile device captured images, comparisons show that the proposed method securely allows an increased amount of embedding capacity but still avoids detection by varying steganalysis techniques.

  5. Deterministic approaches for blind equalization of time-varying channels with antenna arrays

    Microsoft Academic Search

    Hui Liu; Georgios B. Giannakis

    1998-01-01

    In this paper, we study the blind equalization problem of time-varying (TV) systems where the channel variations are too rapid to be tracked with conventional adaptive equalizers. We show that using a finite Fourier basis expansion, a TV antenna array system can be cast into a time-invariant multi-input, multi-output (MIMO) framework. The multiple inputs are related through the bases, thereby

  6. Effects of seasonally varying dietary crude protein levels on collared peccary population dynamics: a simulation study. 

    E-print Network

    Wilber, James Paul

    1987-01-01

    protein (CP) levels on growth, survival, and reproductive success of collared peccaries is described, validated, and used to simulate population responses to selected environmental conditions. The model represents explicitly the responses of individual... weight dynamics for juvenile and adult peccaries on varying CP diets compared favorably with similar data collected from captive animals. However, simulated individuals may lose weight too rapidly when dietary CP remains at extremely low levels...

  7. Mobility of icy sand packs, with application to Martian permafrost

    USGS Publications Warehouse

    Durham, W.B.; Pathare, A.V.; Stern, L.A.; Lenferink, H.J.

    2009-01-01

    [1] The physical state of water on Mars has fundamental ramifications for both climatology and astrobiology. The widespread presence of "softened" Martian landforms (such as impact craters) can be attributed to viscous creep of subsurface ground ice. We present laboratory experiments designed to determine the minimum amount of ice necessary to mobilize topography within Martian permafrost. Our results show that the jammed-to-mobile transition of icy sand packs neither occurs at fixed ice content nor is dependent on temperature or stress, but instead correlates strongly with the maximum dry packing density of the sand component. Viscosity also changes rapidly near the mobility transition. The results suggest a potentially lower minimum volatile inventory for the impact-pulverized megaregolith of Mars. Furthermore, the long-term preservation of partially relaxed craters implies that the ice content of Martian permafrost has remained close to that at the mobility transition throughout Martian history. Copyright 2009 by the American Geophysical Union.

  8. Stochastic Modeling and Power Control of Time-Varying Wireless Communication Networks

    SciTech Connect

    Olama, Mohammed M [ORNL; Djouadi, Seddik M [ORNL; Charalambous, Prof. Charalambos [University of Cyprus

    2014-01-01

    Wireless networks are characterized by nodes mobility, which makes the propagation environment time-varying and subject to fading. As a consequence, the statistical characteristics of the received signal vary continuously, giving rise to a Doppler power spectral density (DPSD) that varies from one observation instant to the next. This paper is concerned with dynamical modeling of time-varying wireless fading channels, their estimation and parameter identification, and optimal power control from received signal measurement data. The wireless channel is characterized using a stochastic state-space form and derived by approximating the time-varying DPSD of the channel. The expected maximization and Kalman filter are employed to recursively identify and estimate the channel parameters and states, respectively, from online received signal strength measured data. Moreover, we investigate a centralized optimal power control algorithm based on predictable strategies and employing the estimated channel parameters and states. The proposed models together with the estimation and power control algorithms are tested using experimental measurement data and the results are presented.

  9. Extensible Hardware Architecture for Mobile Robots

    NASA Technical Reports Server (NTRS)

    Park, Eric; Kobayashi, Linda; Lee, Susan Y.

    2005-01-01

    The Intelligent Robotics Group at NASA Ames Research Center has developed a new mobile robot hardware architecture designed for extensibility and reconfigurability. Currently implemented on the k9 rover. and won to be integrated onto the K10 series of human-robot collaboration research robots, this architecture allows for rapid changes in instrumentation configuration and provides a high degree of modularity through a synergistic mix of off-the-shelf and custom designed components, allowing eased transplantation into a wide vane6 of mobile robot platforms. A component level overview of this architecture is presented along with a description of the changes required for implementation on K10 , followed by plans for future work.

  10. On the move: Incarceration, race, and residential mobility.

    PubMed

    Warner, Cody

    2015-07-01

    The present study examines the relationship between incarceration and post-prison residential mobility. In spite of recent research examining the residential context following incarceration, we know little about if or how incarceration affects individual patterns of residential mobility. This study starts to fill this gap in knowledge by drawing on nationally representative data from the 1979 National Longitudinal Survey of Youth (NLSY79). I find that individuals with a history of incarceration are more likely to move after prison than they are before prison. This relationship holds even after accounting for various time-varying and time-stable sources of spuriousness, including other known correlates of mobility. Additional analyses suggest that this effect is strongest early in the reentry period, and that there exists important racial variation in the relationship between incarceration and mobility. These results imply that, while housing stability is an important feature of successful prisoner reentry, incarceration contributes to larger patterns of residential instability. PMID:26004473

  11. iZone: A Location-Based Mobile Social Networking System

    E-print Network

    Cheng, Rui; Xia, Feng

    2010-01-01

    The rapid development of wireless technology, the extensive use of mobile phones and the availability of location information are facilitating personalized location-based applications. Easy to carry, easy to use and easy to buy, smart phones with certain software are of great advantage. Consequently, mobile social networking (MSN) systems have emerged rapidly, being a revolution for our everyday life. Based on the analysis of general requirements of MSN and location-based services (LBS), this paper presents the design of iZone, a mobile social networking system, as well as a prototype implementation. This platform exploits mobile GIS (Geographic Information Systems), LBS and J2ME technologies, combining geographical data to display map on mobile phones. It can provide a number of social networking services via smartphones.

  12. Network-aware Mobile Programs

    Microsoft Academic Search

    Anurag Acharya; Joel Saltz; M. Ranganathan; Shamik D. Sharma

    1997-01-01

    In this paper, we investigate network-aware mobile pro- grams, programs that can use mobility as a tool to adapt to variations in networkcharacteristics. We present infras- tructural support for mobility and network monitoringand show howadaptalk, a Java-based mobile Internet chat application can take advantage of this support to dynami- cally place the chat server so as to minimize response time.

  13. User Interfaces for Mobile Content

    Microsoft Academic Search

    S. R. Subramanya; Byung K. Yi

    2006-01-01

    The UI must be designed to facilitate the widespread and increased use of mobile content. Current UI approaches in the computing domain - such as windows, icons, menus, and pointing (WIMP) - are inadequate and inappropriate for mobile applications. Mobile device constraints pose several UI design challenges. UIs for emerging mobile devices consist of hardware and software combinations such as

  14. Mobility. Snapshot Report, Fall 2011

    ERIC Educational Resources Information Center

    National Student Clearinghouse, 2011

    2011-01-01

    This paper presents information on student mobility for 2011. It offers data on the following: (1) Mobility Rates by Student Enrollment Status; (2) Mobile Student Enrollment at 2-/4-Year Institutions; and (3) Mobile Student Enrollment at Public/Private Institutions.

  15. Users' perception of mobile payment

    Microsoft Academic Search

    Steinar Kristoffersen; Anders Synstad; Kristian Sorli

    2008-01-01

    This paper reports from an empirical study of users' attitudes pertaining to novel payment solutions, particularly e-cash and mobile micro payments (m-payments). This is a particularly important aspect of mobile services development, since cumbersome payment allegedly is a significant barrier to the adoption of mobile commerce. Moreover, it is often seen as a 'killer' mobile application in its own right,

  16. Compact multi-probe antenna test station for rapid testing of antennas and wireless terminals

    Microsoft Academic Search

    Luc Duchesne; Philippe Garreau; Nicolas Robic; Arnaud Gandois; Per Olaf Iversen; Gianni Barone

    2004-01-01

    Rapid characterization and pre-qualification measurements are becoming more and more important for the ever-growing number of small antennas, mobile telephones and other wireless terminals. There is a need driven by the wireless industries for a smart test set-up with reduced dimensions and capable of measuring radiating devices. Satimo has developed a compact, mobile and cost-effective test station called StarLab which

  17. Compact multiprobe antenna test station for rapid testing of antennas and wireless terminals

    Microsoft Academic Search

    L. Duchesne; Ph. Garreau; N. Robic; A. Gandois; P. O. Iversen; G. Barone

    2004-01-01

    Rapid characterization and prequalification measurements are becoming more and more important for the evergrowing number of small antennas, mobile phones and other wireless terminals. There is a need driven by the wireless industries for a smart test set-up with reduced dimensions and capable of measuring radiating devices. Satimo has developed a compact, mobile and cost-effective test station called StarLab which

  18. Periodic structures with time-varying loads

    NASA Technical Reports Server (NTRS)

    Epp, Larry W.; Chan, Chi H.; Mittra, Raj

    1992-01-01

    A new method is described for generating and predicting the power scattered at multiple frequencies from a periodic array excited by a monochromatic incident plane wave. The scattered power is predicted by developing an equivalent circuit representation from the exact method of moment solution of the unloaded periodic problem and then employing a modified method of moments approach to predict the scattered fields due to time-varying loads. An advantage of this method is that the generality of the equivalent circuit can be exploited to study the effects of different loads on the power scattered in the harmonic frequencies with a minimal amount of effort. The method can also be applied to multiple incident frequencies.

  19. Inference of temporally varying Bayesian Networks

    PubMed Central

    Thorne, Thomas; Stumpf, Michael P. H.

    2012-01-01

    Motivation: When analysing gene expression time series data, an often overlooked but crucial aspect of the model is that the regulatory network structure may change over time. Although some approaches have addressed this problem previously in the literature, many are not well suited to the sequential nature of the data. Results: Here, we present a method that allows us to infer regulatory network structures that may vary between time points, using a set of hidden states that describe the network structure at a given time point. To model the distribution of the hidden states, we have applied the Hierarchical Dirichlet Process Hidden Markov Model, a non-parametric extension of the traditional Hidden Markov Model, which does not require us to fix the number of hidden states in advance. We apply our method to existing microarray expression data as well as demonstrating is efficacy on simulated test data. Contact: thomas.thorne@imperial.ac.uk PMID:23074260

  20. WKB approximation for abruptly varying potential wells

    NASA Astrophysics Data System (ADS)

    Amthong, Attapon

    2014-11-01

    We present an approach to obtain eigenfunctions and eigenenergies for abruptly varying potentials in the framework of the Wentzel-Kramers-Brillouin (WKB) approximation. To illustrate it, two examples of the potentials are studied. The first one is the combination of a step barrier and a harmonic oscillator potential, and the second one consists of a step barrier and a linear potential. The formulation of a WKB quantization rule is proposed. Our approach shows that WKB energies and those from numerical calculation are in good agreement. According to matching conditions used, WKB wavefunctions in this present work are violated at only one classical turning point, but they behave well at another point where the potentials are discontinuous.

  1. Time varying arctic climate change amplification

    SciTech Connect

    Chylek, Petr [Los Alamos National Laboratory; Dubey, Manvendra K [Los Alamos National Laboratory; Lesins, Glen [DALLHOUSIE U; Wang, Muyin [NOAA/JISAO

    2009-01-01

    During the past 130 years the global mean surface air temperature has risen by about 0.75 K. Due to feedbacks -- including the snow/ice albedo feedback -- the warming in the Arctic is expected to proceed at a faster rate than the global average. Climate model simulations suggest that this Arctic amplification produces warming that is two to three times larger than the global mean. Understanding the Arctic amplification is essential for projections of future Arctic climate including sea ice extent and melting of the Greenland ice sheet. We use the temperature records from the Arctic stations to show that (a) the Arctic amplification is larger at latitudes above 700 N compared to those within 64-70oN belt, and that, surprisingly; (b) the ratio of the Arctic to global rate of temperature change is not constant but varies on the decadal timescale. This time dependence will affect future projections of climate changes in the Arctic.

  2. Fundamental Investigation of Circumferentially Varying Stator Cascades

    NASA Astrophysics Data System (ADS)

    Farnsworth, John A. N.

    2011-12-01

    The fundamentals of circumferentially varying stator cascades and their interactions with a downstream fixed pitch propeller were investigated experimentally utilizing multiple measurement techniques. The flow physics associated with the isolated circumferentially varying, or cyclic, stator cascade was studied in a wind tunnel environment through string tuft flow visualization, 2-D PIV, Stereoscopic PIV, and static surface pressure measurements. The coupled wake physics of the cyclic stator cascade with propeller were then investigated in a water tunnel using Stereo PIV. Finally, the global performance of components and the coupled system were quantified through force and moment measurements on the model in the water tunnel. A cyclic distribution of the stators' deflections resulted in non-axisymmetric distributions of the surface pressure and the flow field downstream of the stator array. In the model near wake the flow field is associated with secondary flow patterns in the form of coherent streamwise vortical structures that can be described by potential flow mechanisms. The collective pitch distribution of the stators produces a flow field that resembles a potential Rankine vortex, whereas the cyclic pitch distribution generates a flow pattern that can be described by a potential vortex pair in a cross flow. The stator distribution alone produces a significant side force that increases linearly with stator pitch amplitude. When a propeller is incorporated downstream from the cyclic cascade the side force from the stator cascade is reduced, but a small vertical force and pitching moment are created. The generation of these secondary forces and moments can be related to the redistribution of the tangential flow from the cyclic cascade into the axial direction by the retreating and advancing blade states of the fixed pitch propeller.

  3. Economic Mobility Project

    NSDL National Science Digital Library

    Working with partners from The American Enterprise Institute and The Urban Institute, the Economic Mobility Project is an initiative of The Pew Charitable Trusts. The aim of the Project is to focus public attention on economic mobility through well-thought out scholarly analyses, reports, public events, and discussion. In the "Reports & Research" section, visitors can download papers like "Neighborhoods and the Black-White Mobility Gap" and "Ups and Downs: Does the American Economy Still Promote Upward Mobility?" Visitors can also look over a topical list of their papers as well. Moving on, the "Newsroom" area provides access to the Project's latest press releases and information about their upcoming events. The site is rounded out by a search engine and an area where visitors can sign up to receive the latest news from the Project.

  4. MASS POLITICAL MOBILIZATION

    E-print Network

    -cut manner before voters.1 Unsurprisingly, political parties are a pervasive phenomenon in representative dem ................................................................................................................................................... MASS POLITICAL MOBILIZATION ................................................................................................................................................... Boix & Stokes: The Oxford Handbook of Comparative Politics Boixandstokes-chap21 Revise Proof page 497

  5. Persuasive Mobile Health Applications

    NASA Astrophysics Data System (ADS)

    Garcia Wylie, Carlos; Coulton, Paul

    With many industrialized societies bearing the cost of an increasingly sedentary lifestyle on the health of their populations there is a need to find new ways of encouraging physical activity to promote better health and well being. With the increasing power of mobile phones and the recent emergence of personal heart rate monitors, aimed at dedicated amateur runners, there is now a possibility to develop “Persuasive Mobile Health Applications” to promote well being through the use of real-time physiological data and persuade users to adopt a healthier lifestyle. In this paper we present a novel general health monitoring software for mobile phones called Heart Angel. This software is aimed at helping users monitor, record, as well as improve their fitness level through built-in cardio-respiratory tests, a location tracking application for analyzing heart rate exertion over time and location, and a fun mobile-exergame called Health Defender.

  6. Limits of social mobilization

    E-print Network

    Pentland, Alex Paul

    The Internet and social media have enabled the mobilization of large crowds to achieve time-critical feats, ranging from mapping crises in real time, to organizing mass rallies, to conducting search-and-rescue operations ...

  7. EcoMOBILE

    NSDL National Science Digital Library

    If you're not scared off by the acronym, the Ecosystems Mobile Outdoor Blended Immersive Learning Environment (EcoMOBILE) is a fabulous learning device. Developed at the Harvard Graduate School of Education with funding from the Institute of Education Sciences, EcoMOBILE is a fairly remarkable initiative that allows students to explore a virtual pond and extend their learning through one or more field trips to a local pond environment. Students can access and collect information and clues about the virtual environment via a mobile device. Then, students can extend their learning to the real world by using environmental probes that allow collection of real-time data. On the site, visitors can learn about the application via a short video, project data, and information about the primary investigators.

  8. Making Mobility Meaningful

    ERIC Educational Resources Information Center

    Vopata, Alvin E.

    1973-01-01

    The sequential orientation and mobility curriculum of the Iowa Braille and Sightsaving School offers visually handicapped students 127 lessons in five flexibly structured units comprising indoor, campus, residential, basic business, and advanced travel units. (MC)

  9. Mobile Aircrafticing Forecast System

    NASA Technical Reports Server (NTRS)

    Moynihan, Philip I.; Walter, Steven J.

    1997-01-01

    An integrated mobile field system for forecasting ground and in-flight aviation icing hazards would be a vital asset for winter operations. Improved icing forecasts are critical to managing aviation icing hazards.

  10. Contextualizing urban mobile fabrics

    E-print Network

    Lin, Michael Chia-Liang

    2007-01-01

    This thesis is focus on the urban fabric issues. To be more specific, I will focus on the "Mobile Fabrics" within the larger Asian urban context. Instead of working with a specific geographical site; I will focus on the ...

  11. Rapid prototype and test

    SciTech Connect

    Gregory, D.L.; Hansche, B.D.

    1996-06-01

    In order to support advanced manufacturing, Sandia has acquired the capability to produce plastic prototypes using stereolithography. Currently, these prototypes are used mainly to verify part geometry and ``fit and form`` checks. This project investigates methods for rapidly testing these plastic prototypes, and inferring from prototype test data actual metal part performance and behavior. Performances examined include static load/stress response, and structural dynamic (modal) and vibration behavior. The integration of advanced non-contacting measurement techniques including scanning laser velocimetry, laser holography, and thermoelasticity into testing of these prototypes is described. Photoelastic properties of the epoxy prototypes to reveal full field stress/strain fields are also explored.

  12. Right-Rapid-Rough

    NASA Technical Reports Server (NTRS)

    Lawrence, Craig

    2003-01-01

    IDEO (pronounced 'eye-dee-oh') is an international design, engineering, and innovation firm that has developed thousands of products and services for clients across a wide range of industries. Its process and culture attracted the attention of academics, businesses, and journalists around the world, and are the subject of a bestselling book, The Art of Innovation by Tom Kelley. One of the keys to IDEO's success is its use of prototyping as a tool for rapid innovation. This story covers some of IDEO's projects, and gives reasons for why they were successful.

  13. Rapid Earthquake Viewer

    NSDL National Science Digital Library

    The Rapid Earthquake Viewer (REV) provides access to earthquake data from seismograph recording stations around the world. The Earthquake View lets users select an earthquake and see data at various stations. The Station View allows users to see if any ground motion has been recorded at a particular station. Lesson plans are being developed for REV, aimed primarly at the middle school level. The resource provides several techniques to help users contextualize and understand seismic data. REV is related to GEE, the Global Earthquake Explorer, a fully-functional earthquake analysis tool.

  14. Rapid Earthquake Viewer Tutorial

    NSDL National Science Digital Library

    This tutorial is designed to help you and your students become familiar with the Rapid Earthquake Viewer (REV), an interactive website that provides access to earthquake data from seismograph stations around the world. REV gathers earthquake data from seismic networks around the Earth and posts information about recent notable earthquakes so you can see where they happened and view the seismograms from global seismograph stations. REV also lets you see if any seismic activity has registered on seismograph stations in your area or other areas around the world. It is recommended that you and your students go through this tutorial before initiating other lessons involving REV.

  15. Rapidly Progressive Dementia

    PubMed Central

    Geschwind, Michael D.; Haman, Aissa; Miller, Bruce L.

    2009-01-01

    Rapidly progressive dementias (RPDs) are neurological conditions that develop subacutely over weeks to months, or rarely acutely over days. In contrast to most dementing conditions that take years to progress to death, RPD can be quickly fatal. It is critical to evaluate the RPD patient without delay, usually in a hospital setting, as they may have a treatable condition. In this review, we discuss a differential diagnostic approach to RPD, emphasizing neurodegenerative, toxic/metabolic, infectious, autoimmune, neoplastic, and other conditions to consider. PMID:17659190

  16. Rapid and Quiet Drill

    NASA Technical Reports Server (NTRS)

    Sherrit, Stewart; Badescu, Mircea; Bar-Cohen, Yoseph; Chang, Zensheu; Bao, Xiaoqi

    2007-01-01

    This describes aspects of the rapid and quiet drill (RAQD), which is a prototype apparatus for drilling concrete or bricks. The design and basic principle of operation of the RAQD overlap, in several respects, with those of ultrasonic/ sonic drilling and coring apparatuses described in a number of previous NASA Tech Briefs articles. The main difference is that whereas the actuation scheme of the prior apparatuses is partly ultrasonic and partly sonic, the actuation scheme of the RAQD is purely ultrasonic. Hence, even though the RAQD generates considerable sound, it is characterized as quiet because most or all of the sound is above the frequency range of human hearing.

  17. Mobile multiple access study

    NASA Technical Reports Server (NTRS)

    1977-01-01

    Multiple access techniques (FDMA, CDMA, TDMA) for the mobile user and attempts to identify the current best technique are discussed. Traffic loading is considered as well as voice and data modulation and spacecraft and system design. Emphasis is placed on developing mobile terminal cost estimates for the selected design. In addition, design examples are presented for the alternative techniques of multiple access in order to compare with the selected technique.

  18. High Electron Mobility Transistors

    Microsoft Academic Search

    Vassil Palankovski; Rüdiger Quay

    \\u000a High Electron Mobility Transistors(HEMTs) [340] are an advanced modification of the simple bulk FET, such as the MEtal Semiconductors\\u000a Field Effect Transistor (MESFET). Typically, a semiconductor material (barrier) with a comparably wider bandgap is grown on\\u000a top of a semiconductor material with a higher mobility and comparably lower bandgap. If the bandgap alignment of the two materials\\u000a is appropriately chosen,

  19. The Boxes Go Mobile

    NSDL National Science Digital Library

    Engineering K-PhD Program,

    To display the results from the previous activity, each student designs and constructs a mobile that contains a duplicate of his or her original box, the new cube-shaped box of the same volume, the scraps that are left over from the original box, and pertinent calculations of the volumes and surface areas involved. They problem solve and apply their understanding of see-saws and lever systems to create balanced mobiles.

  20. Mobile Christian - shuttle flight

    NASA Technical Reports Server (NTRS)

    2009-01-01

    Louis Stork, 13, and Erin Whittle, 14, look on as Brianna Johnson, 14, conducts a 'test' of a space shuttle main engine in the Test Control Center exhibit in StenniSphere, the visitor center at NASA's John C. Stennis Space Center near Bay St. Louis, Miss. The young people were part of a group from Mobile Christian School in Mobile, Ala., that visited StenniSphere on April 21.

  1. IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS, VOL. 17, NO. 4, APRIL 1999 689 The Rapidly Deployable Radio Network

    E-print Network

    Kansas, University of

    communication facilities, such as fiber links, wire links, or satellite links. Rapid deployment and mobilityIEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS, VOL. 17, NO. 4, APRIL 1999 689 The Rapidly application for the RDRN is the need to quickly establish a communications infrastructure following a natural

  2. Rapid flash lamp

    SciTech Connect

    Gavenonis, Thomas L. (544 Sand Hill Rd., R.D. #3, Montoursville, Lycoming County, PA 17754); Hewitt, William H. (24 G Acres Dr., Essex County, Bradford, MA 01830)

    1989-01-01

    A method and apparatus for providing low peak time and pulse width actinic energy from a lamp by varying the input energy of a capacitive ignition circuit having relatively high voltage to the lamp. The lamp comprises a pair of electrodes disposed within a light transparent envelope in which a combustible and an oxidizing gas reaction combination is located. The combustible is preferably shredded zirconium which is in contact with and provides an electrical discharge path between the electrodes. The gas is preferably pressurized oxygen.

  3. Rapid flash lamp

    DOEpatents

    Gavenonis, Thomas L.; Hewitt, William H.

    1989-06-06

    A method and apparatus for providing low peak time and pulse width actinic energy from a lamp by varying the input energy of a capacitive ignition circuit having relatively high voltage to the lamp. The lamp comprises a pair of electrodes disposed within a light transparent envelope in which a combustible and an oxidizing gas reaction combination is located. The combustible is preferably shredded zirconium which is in contact with and provides an electrical discharge path between the electrodes. The gas is preferably pressurized oxygen.

  4. Impairments in mobility and balance in relation to frailty.

    PubMed

    Davis, Daniel H J; Rockwood, Michael R H; Mitnitski, Arnold B; Rockwood, Kenneth

    2011-01-01

    We set out to describe the relationship between impaired balance, mobility and frailty, and relate these to risk of death. We examined a subsample of 1295 community-dwelling non-demented adults from the second wave of the Canadian Study of Health and Aging (CSHA), a prospective population-based cohort study. Frailty index (FI) scores were constructed from a standardized comprehensive geriatric assessment (FI-CGA). History of mobility impairments and falls were assessed. Timed-up-and-go (TUG) and functional reach (FR) performance were measured. The CSHA clinical frailty scale (CFS) was judged by a physician. Adverse outcomes were determined at CSHA-3, conducted 5 years later. The FI-CGA varied in association with impaired mobility and balance. A history of mobility problems was demonstrable at FI-CGA scores >0.12. This level of frailty also represented the most marked deterioration in performance measures (TUG and FR). FI-CGA scores best predicted mortality (HR 1.04±0.02), proving to be a dominating factor in multivariate regression models that included mobility and balance markers. Only at the upper range of FI-CGA reported (>0.45) did all participants demonstrate mobility impairment. Impaired balance and mobility contribute to frailty, but neither is sufficient to define a participant as frail. PMID:20678816

  5. Spaceborne Mobile Ad-Hoc Networks

    NASA Astrophysics Data System (ADS)

    Forcada, I.; Strauss, A.

    2010-08-01

    Reliable global networking is essential for a rapidly growing mobile and interactive communication. Satellite communication plays already a significant role in this subject. However, the classical space-based data transmission requires an appropriate infrastructure, both on the ground and in orbit. This paper discusses the potential of a self-organising distributed satellite system in Low Earth Orbits (LEO) to achieve a seamless integration in already existing infrastructures. The communication approach is based on dynamic Inter Satellite Links (ISL) not controlled nor coordinated on an individual basis from the ground-based stations.

  6. RapidTech: National Center for Rapid Technologies

    NSDL National Science Digital Library

    Saddleback College hosts the National Center for Rapid Technologies (RapidTech) with funding support by the National Science Foundation Advanced Technological Education program. The center focuses on automotive, aerospace, consumer product, art & animation, architecture, medical device and medical modeling. Expertise includes Digital Shape Verification (reverse engineering), CAD design, Direct Digital Manufacturing processes, Rapid Prototyping and Rapid Tooling. Direct support is provided in these areas to industry and education through direct service support, curriculum, training, case studies and manufacturing processes. Additionally, the center works closely with industry to assist in research and technologytransfer for adoption and utilization of Rapid Technologies. Certification of processes and skills are also a focus of the national center.

  7. Time-varying wavelet estimation and deconvolution by kurtosis maximization

    E-print Network

    van der Baan, Mirko

    Time-varying wavelet estimation and deconvolution by kurtosis maximization Mirko van der Baan1 reveal the phase of a seismic wavelet. It is robust enough to detect time-varying phase changes. Phase deconvo- lution can be achieved using time-varying Wiener filtering. Time-varying wavelet extraction

  8. Rapid decisions from experience.

    PubMed

    Zeigenfuse, Matthew D; Pleskac, Timothy J; Liu, Taosheng

    2014-05-01

    In many everyday decisions, people quickly integrate noisy samples of information to form a preference among alternatives that offer uncertain rewards. Here, we investigated this decision process using the Flash Gambling Task (FGT), in which participants made a series of choices between a certain payoff and an uncertain alternative that produced a normal distribution of payoffs. For each choice, participants experienced the distribution of payoffs via rapid samples updated every 50ms. We show that people can make these rapid decisions from experience and that the decision process is consistent with a sequential sampling process. Results also reveal a dissociation between these preferential decisions and equivalent perceptual decisions where participants had to determine which alternatives contained more dots on average. To account for this dissociation, we developed a sequential sampling rank-dependent utility model, which showed that participants in the FGT attended more to larger potential payoffs than participants in the perceptual task despite being given equivalent information. We discuss the implications of these findings in terms of computational models of preferential choice and a more complete understanding of experience-based decision making. PMID:24549141

  9. Rapid Decisions From Experience

    PubMed Central

    Zeigenfuse, Matthew D.; Pleskac, Timothy J.; Liu, Taosheng

    2014-01-01

    In many everyday decisions, people quickly integrate noisy samples of information to form a preference among alternatives that offer uncertain rewards. Here, we investigated this decision process using the Flash Gambling Task (FGT), in which participants made a series of choices between a certain payoff and an uncertain alternative that produced a normal distribution of payoffs. For each choice, participants experienced the distribution of payoffs via rapid samples updated every 50 ms. We show that people can make these rapid decisions from experience and that the decision process is consistent with a sequential sampling process. Results also reveal a dissociation between these preferential decisions and equivalent perceptual decisions where participants had to determine which alternatives contained more dots on average. To account for this dissociation, we developed a sequential sampling rank-dependent utility model, which showed that participants in the FGT attended more to larger potential payoffs than participants in the perceptual task despite being given equivalent information. We discuss the implications of these findings in terms of computational models of preferential choice and a more complete understanding of experience-based decision making. PMID:24549141

  10. Rapid City, SD Showcase Streamgage

    USGS Multimedia Gallery

    A USGS South Dakota Water Science Center streamgage was dedicated by Congressional and city officials on September 3 in Rapid City. This showcase streamgage is located on Rapid Creek at Rapid City in Founders Park and provides visitors with critical information about how streamflow is meas...

  11. A compact transport and charge model for GaN-based high electron mobility transistors for RF applications

    E-print Network

    Radhakrishna, Ujwal

    2013-01-01

    Gallium Nitride (GaN)-based high electron mobility transistors (HEMTs) are rapidly emerging as front-runners in high-power mm-wave circuit applications. For circuit design with current devices and to allow sensible future ...

  12. Mapping Oyster Reef Habitats in Mobile Bay

    NASA Technical Reports Server (NTRS)

    Bolte, Danielle

    2011-01-01

    Oyster reefs around the world are declining rapidly, and although they haven t received as much attention as coral reefs, they are just as important to their local ecosystems and economies. Oyster reefs provide habitats for many species of fish, invertebrates, and crustaceans, as well as the next generations of oysters. Oysters are also harvested from many of these reefs and are an important segment of many local economies, including that of Mobile Bay, where oysters rank in the top five commercial marine species both by landed weight and by dollar value. Although the remaining Mobile Bay oyster reefs are some of the least degraded in the world, projected climate change could have dramatic effects on the health of these important ecosystems. The viability of oyster reefs depends on water depth and temperature, appropriate pH and salinity levels, and the amount of dissolved oxygen in the water. Projected increases in sea level, changes in precipitation and runoff patterns, and changes in pH resulting from increases in the amount of carbon dioxide dissolved in the oceans could all affect the viability of oyster reefs in the future. Human activities such as dredging and unsustainable harvesting practices are also adversely impacting the oyster reefs. Fortunately, several projects are already under way to help rebuild or support existing or previously existing oyster reefs. The success of these projects will depend on the local effects of climate change on the current and potential habitats and man s ability to recognize and halt unsustainable harvesting practices. As the extent and health of the reefs changes, it will have impacts on the Mobile Bay ecosystem and economy, changing the resources available to the people who live there and to the rest of the country, since Mobile Bay is an important national source of seafood. This project identified potential climate change impacts on the oyster reefs of Mobile Bay, including the possible addition of newly viable habitats in the southeastern regions of the Bay.

  13. Mobile medical image retrieval

    NASA Astrophysics Data System (ADS)

    Duc, Samuel; Depeursinge, Adrien; Eggel, Ivan; Müller, Henning

    2011-03-01

    Images are an integral part of medical practice for diagnosis, treatment planning and teaching. Image retrieval has gained in importance mainly as a research domain over the past 20 years. Both textual and visual retrieval of images are essential. In the process of mobile devices becoming reliable and having a functionality equaling that of formerly desktop clients, mobile computing has gained ground and many applications have been explored. This creates a new field of mobile information search & access and in this context images can play an important role as they often allow understanding complex scenarios much quicker and easier than free text. Mobile information retrieval in general has skyrocketed over the past year with many new applications and tools being developed and all sorts of interfaces being adapted to mobile clients. This article describes constraints of an information retrieval system including visual and textual information retrieval from the medical literature of BioMedCentral and of the RSNA journals Radiology and Radiographics. Solutions for mobile data access with an example on an iPhone in a web-based environment are presented as iPhones are frequently used and the operating system is bound to become the most frequent smartphone operating system in 2011. A web-based scenario was chosen to allow for a use by other smart phone platforms such as Android as well. Constraints of small screens and navigation with touch screens are taken into account in the development of the application. A hybrid choice had to be taken to allow for taking pictures with the cell phone camera and upload them for visual similarity search as most producers of smart phones block this functionality to web applications. Mobile information access and in particular access to images can be surprisingly efficient and effective on smaller screens. Images can be read on screen much faster and relevance of documents can be identified quickly through the use of images contained in the text. Problems with the many, often incompatible mobile platforms were discovered and are listed in the text. Mobile information access is a quickly growing domain and the constraints of mobile access also need to be taken into account for image retrieval. The demonstrated access to the medical literature is most relevant as the medical literature and their images are clearly the largest knowledge source in the medical field.

  14. Biocompatible nanoparticles trigger rapid bacteria clustering.

    PubMed

    Larsen, Mona Utne; Seward, Matthew; Tripathi, Anubhav; Shapley, Nina C

    2009-01-01

    This study reveals an exciting phenomenon of stimulated bacteria clustering. Rapid aggregation and microbial arrest are shown to occur in Escherichia coli solutions of neutral pH when chitosan nanoparticles with positive zeta potential are added. Because chitosan nanoparticles can easily be dispersed in aqueous buffers, the rapid clustering phenomenon requires only minuscule nanoparticle concentrations and will be critical in developing new methods for extricating bacterial pathogens. This work establishes the dominant role of electrostatic attraction in bacteria-nanoparticle interactions by varying the nanoparticle zeta potential from highly positive to strongly negative values, and by exploring concentration effects. For strongly negative nanoparticles, no clusters form, while aggregates are small and loose at intermediate conditions. In addition, optical density measurements indicate that over 90% of the suspended bacteria flocculate within seconds of being mixed with chitosan nanoparticles of a highly positive surface charge. Finally, the nanoparticles are significantly more efficient as a clustering agent compared to an equal mass of molecular chitosan in solution, as the bacteria-nanoparticle clusters formed are substantially larger. The bacteria-nanoparticle aggregation effect demonstrated here promises a rapid separation method for aiding pathogen detection and for flocculation of bacteria in fermentation processes. PMID:19565661

  15. Aerodynamics inside a rapid compression machine

    SciTech Connect

    Mittal, Gaurav; Sung, Chih-Jen [Department of Mechanical and Aerospace Engineering, Case Western Reserve University, Cleveland, OH 44106 (United States)

    2006-04-15

    The aerodynamics inside a rapid compression machine after the end of compression is investigated using planar laser-induced fluorescence (PLIF) of acetone. To study the effect of reaction chamber configuration on the resulting aerodynamics and temperature field, experiments are conducted and compared using a creviced piston and a flat piston under varying conditions. Results show that the flat piston design leads to significant mixing of the cold vortex with the hot core region, which causes alternate hot and cold regions inside the combustion chamber. At higher pressures, the effect of the vortex is reduced. The creviced piston head configuration is demonstrated to result in drastic reduction of the effect of the vortex. Experimental conditions are also simulated using the Star-CD computational fluid dynamics package. Computed results closely match with experimental observation. Numerical results indicate that with a flat piston design, gas velocity after compression is very high and the core region shrinks quickly due to rapid entrainment of cold gases. Whereas, for a creviced piston head design, gas velocity after compression is significantly lower and the core region remains unaffected for a long duration. As a consequence, for the flat piston, adiabatic core assumption can significantly overpredict the maximum temperature after the end of compression. For the creviced piston, the adiabatic core assumption is found to be valid even up to 100 ms after compression. This work therefore experimentally and numerically substantiates the importance of piston head design for achieving a homogeneous core region inside a rapid compression machine. (author)

  16. Vector curvaton with varying kinetic function

    NASA Astrophysics Data System (ADS)

    Dimopoulos, Konstantinos; Kar?iauskas, Mindaugas; Wagstaff, Jacques M.

    2010-01-01

    A new model realization of the vector curvaton paradigm is presented and analyzed. The model consists of a single massive Abelian vector field, with a Maxwell-type kinetic term. By assuming that the kinetic function and the mass of the vector field are appropriately varying during inflation, it is shown that a scale-invariant spectrum of superhorizon perturbations can be generated. These perturbations can contribute to the curvature perturbation of the Universe. If the vector field remains light at the end of inflation it is found that it can generate substantial statistical anisotropy in the spectrum and bispectrum of the curvature perturbation. In this case the non-Gaussianity in the curvature perturbation is predominantly anisotropic, which will be a testable prediction in the near future. If, on the other hand, the vector field is heavy at the end of inflation then it is demonstrated that particle production is approximately isotropic and the vector field alone can give rise to the curvature perturbation, without directly involving any fundamental scalar field. The parameter space for both possibilities is shown to be substantial. Finally, toy models are presented which show that the desired variation of the mass and kinetic function of the vector field can be realistically obtained, without unnatural tunings, in the context of supergravity or superstrings.

  17. Honeybee odometry: performance in varying natural terrain.

    PubMed

    Tautz, Juergen; Zhang, Shaowu; Spaethe, Johannes; Brockmann, Axel; Si, Aung; Srinivasan, Mandyam

    2004-07-01

    Recent studies have shown that honeybees flying through short, narrow tunnels with visually textured walls perform waggle dances that indicate a much greater flight distance than that actually flown. These studies suggest that the bee's "odometer" is driven by the optic flow (image motion) that is experienced during flight. One might therefore expect that, when bees fly to a food source through a varying outdoor landscape, their waggle dances would depend upon the nature of the terrain experienced en route. We trained honeybees to visit feeders positioned along two routes, each 580 m long. One route was exclusively over land. The other was initially over land, then over water and, finally, again over land. Flight over water resulted in a significantly flatter slope of the waggle-duration versus distance regression, compared to flight over land. The mean visual contrast of the scenes was significantly greater over land than over water. The results reveal that, in outdoor flight, the honeybee's odometer does not run at a constant rate; rather, the rate depends upon the properties of the terrain. The bee's perception of distance flown is therefore not absolute, but scene-dependent. These findings raise important and interesting questions about how these animals navigate reliably. PMID:15252454

  18. Honeybee Odometry: Performance in Varying Natural Terrain

    PubMed Central

    Tautz, Juergen; Zhang, Shaowu; Spaethe, Johannes; Brockmann, Axel; Si, Aung

    2004-01-01

    Recent studies have shown that honeybees flying through short, narrow tunnels with visually textured walls perform waggle dances that indicate a much greater flight distance than that actually flown. These studies suggest that the bee's “odometer” is driven by the optic flow (image motion) that is experienced during flight. One might therefore expect that, when bees fly to a food source through a varying outdoor landscape, their waggle dances would depend upon the nature of the terrain experienced en route. We trained honeybees to visit feeders positioned along two routes, each 580 m long. One route was exclusively over land. The other was initially over land, then over water and, finally, again over land. Flight over water resulted in a significantly flatter slope of the waggle-duration versus distance regression, compared to flight over land. The mean visual contrast of the scenes was significantly greater over land than over water. The results reveal that, in outdoor flight, the honeybee's odometer does not run at a constant rate; rather, the rate depends upon the properties of the terrain. The bee's perception of distance flown is therefore not absolute, but scene-dependent. These findings raise important and interesting questions about how these animals navigate reliably. PMID:15252454

  19. Time-Varying Modeling of Cerebral Hemodynamics

    PubMed Central

    Marmarelis, Vasilis Z.; Shin, Dae C.; Orme, Melissa; Zhang, Rong

    2014-01-01

    The scientific and clinical importance of cerebral hemodynamics has generated considerable interest in their quantitative understanding via computational modeling. In particular, two aspects of cerebral hemodynamics, Cerebral Flow Autoregulation (CFA) and CO2 Vasomotor Reactivity (CVR), have attracted much attention because they are implicated in many important clinical conditions and pathologies (orthostatic intolerance, syncope, hypertension, stroke, vascular dementia, MCI, Alzheimer’s disease and other neurodegenerative diseases with cerebrovascular components). Both CFA and CVR are dynamic physiological processes by which cerebral blood flow is regulated in response to fluctuations in cerebral perfusion pressure and blood CO2 tension. Several modeling studies to date have analyzed beat-to-beat hemodynamic data in order to advance our quantitative understanding of CFA-CVR dynamics. A confounding factor in these studies is the fact that the dynamics of the CFA-CVR processes appear to vary with time (i.e. changes in cerebrovascular characteristics) due to neural, endocrine and metabolic effects. This paper seeks to address this issue by tracking the changes in linear time-invariant models obtained from short successive segments of data from 10 healthy human subjects. The results suggest that systemic variations exist but have stationary statistics and, therefore, the use of time-invariant modeling yields “time-averaged models” of physiological and clinical utility. PMID:24184697

  20. General dynamics of varying-alpha universes

    NASA Astrophysics Data System (ADS)

    Barrow, John D.; Graham, Alexander A. H.

    2013-11-01

    We introduce and study extensions of the varying alpha theory of Bekenstein-Sandvik-Barrow-Magueijo to allow for an arbitrary coupling function and self-interaction potential term in the theory. We study the full evolution equations without assuming that variations in alpha have a negligible effect on the expansion scale factor and the matter density evolution, as was assumed in earlier studies. The background Friedmann-Robertson-Walker cosmology of this model in the cases of zero and nonzero spatial curvature is studied in detail, using dynamical systems techniques, for a wide class of potentials and coupling functions. All the asymptotic behaviors are found, together with some new solutions. We study the cases where the electromagnetic parameter, zeta, is positive and negative, corresponding to magnetic and electrostatic energy domination in the nonrelativistic matter. In particular, we investigate the cases where the scalar field driving alpha variations has exponential and power-law self-interaction potentials and the behavior of theories where the coupling constant between matter and alpha variations is no longer a constant.

  1. Induction accelerators with varied core materials

    NASA Astrophysics Data System (ADS)

    Molvik, A. W.; Meier, W. R.; Faltens, A.; Reginato, L. L.; Smith, C. H.

    1998-11-01

    We discuss system code studies of high-current heavy-ion accelerators, involving tradeoffs among induction core materials with varying ?B, magnetization loss, and cost. Large masses of magnetic core material are required for many of the induction accelerator-based projects currently under study; the quantities required exceed 10^7 kg for a linear heavy-ion fusion driver, so core performance and cost are critical issues. We have evaluated moderate size, 1 to 11 kg, cores of amorphous and nanocrystalline alloys. We characterized the materials in terms of the flux swing ?B from -B_remanent to +B_saturation, and the energy loss versus dB/dt. We found sources for each material that could apply an insulating coating, wind, and then anneal the cores at 350-550^o C. The result is core performance near the ultimate small sample performance, with higher ?B and lower losses than the earlier approaches of using as-cast material or rewinding after anneal, usually insulated with thin mylar ( 4?m thick).

  2. Pediatric lupus: varied haematological picture and presentation.

    PubMed

    Thakur, Neha; Chandra, Jagdish; Dhingra, Bhavna; Singh, V

    2015-03-01

    Systemic lupus erythematosus (SLE) is a chronic, multisystem, autoimmune disease characterized by periods of increased disease activity caused by inflammation of blood vessels and connective tissue. Pediatric patients with SLE have a more severe clinical course when compared with adults. Patients commonly present with rash, fever, and arthritis, although the presentation may be unpredictable. Hematological findings are more predominant in children than adults. Thirty-nine percent of children with SLE will develop hematological abnormalities, one of the American Rheumatic Association criteria for classifying the disease. In our case series we found varied hematological picture and presentation. We present here four case reports of SLE cases with interesting hematological features. Our first case is a 13 month old female child who was initially diagnosed as Evans syndrome and 2 years later diagnosed as SLE. Second case is a 3 year old male child who had SLE with warm antibody AIHA. Third case is a 6 year old female child who presented with AIHA and was diagnosed with SLE 6 years later. Fourth case is a 6 year old female child diagnosed as SLE with aplastic anemia. Hematological findings should be carefully assessed and treated in order to decrease disease related morbidity. PMID:25548448

  3. Estimation of the continuously varying Doppler effect

    NASA Astrophysics Data System (ADS)

    Nelson, D. J.; Troxell, S. J.

    2010-04-01

    There are many applications for which it is important to resolve the location and motion of a target position. For the static situation in which a target transmitter and several receivers are not in motion, the target may be completely resolved by triangulation using relative time delays estimated by several receivers at known locations. These delays are normally estimated from the location of peaks in the magnitude of the cross-correlation function. For active radars, a transmitted signal is reflected by the target, and range and radial velocity are estimated from the delay and Doppler effects on the received signal. In this process, Doppler effects are conventionally modeled as a shift in frequency, and delay and Doppler are estimated from a cross-ambiguity function (CAF) in which delay and Doppler frequency shift are assumed to be independent and approximately constant. Delay and Doppler are jointly estimated as the location of the peak magnitude of the CAF plane. We present methods for accurately estimating delay for the static case and delay and the time-varying Doppler effects for non-static models, such as the radar model.

  4. Stratospheric Impact of Varying Sea Surface Temperatures

    NASA Technical Reports Server (NTRS)

    Newman, Paul A.; Nash, Eric R.; Nielsen, Jon E.; Waugh, Darryn; Pawson, Steven

    2004-01-01

    The Finite-Volume General Circulation Model (FVGCM) has been run in 50 year simulations with the: 1) 1949-1999 Hadley Centre sea surface temperatures (SST), and 2) a fixed annual cycle of SSTs. In this presentation we first show that the 1949-1999 FVGCM simulation produces a very credible stratosphere in comparison to an NCEP/NCAR reanalysis climatology. In particular, the northern hemisphere has numerous major and minor stratospheric warming, while the southern hemisphere has only a few over the 50-year simulation. During the northern hemisphere winter, temperatures are both warmer in the lower stratosphere and the polar vortex is weaker than is found in the mid-winter southern hemisphere. Mean temperature differences in the lower stratosphere are shown to be small (less than 2 K), and planetary wave forcing is found to be very consistent with the climatology. We then will show the differences between our varying SST simulation and the fixed SST simulation in both the dynamics and in two parameterized trace gases (ozone and methane). In general, differences are found to be small, with subtle changes in planetary wave forcing that lead to reduced temperatures in the SH and increased temperatures in the NH.

  5. Rapid inactivation of a moth pheromone.

    PubMed

    Ishida, Yuko; Leal, Walter S

    2005-09-27

    We have isolated, cloned, and expressed a male antennae-specific pheromone-degrading enzyme (PDE) [Antheraea polyphemus PDE (ApolPDE), formerly known as Sensillar Esterase] from the wild silkmoth, A. polyphemus, which seems essential for the rapid inactivation of pheromone during flight. The onset of enzymatic activity was detected at day 13 of the pupal stage with a peak at day 2 adult stage. De novo sequencing of ApolPDE, isolated from day 2 male antennae by multiple chromatographic steps, led to cDNA cloning. Purified recombinant ApolPDE, expressed by baculovirus, migrated with the same mobility as the native protein on both native polyacrylamide and isoelectric focusing gel electrophoresis. Concentration of ApolPDE (0.5 microM) in the sensillar lymph is approximately 20,000 lower than that of a pheromone-binding protein. Native and recombinant ApolPDE showed comparable kinetic parameters, with turnover number similar to that of carboxypeptidase and substrate specificity slightly lower than that of acetylcholinesterase. The rapid inactivation of pheromone, even faster than previously estimated, is kinetically compatible with the temporal resolution required for sustained odorant-mediated flight in moths. PMID:16172410

  6. Rapid mercury assays

    SciTech Connect

    Szurdoki, S.; Kido, H.; Hammock, B.D. [Univ. of California, Davis, CA (United States)

    1996-10-01

    We have developed rapid assays with the potential of detecting mercury in environmental samples. our methods combine the simple ELISA-format with the selective, high affinity complexation of mercuric ions by sulfur-containing ligands. The first assay is based on a sandwich chelate formed by a protein-bound ligand immobilized on the wells of a microliter plate, mercuric ion of the analyzed sample, and another ligand conjugated to a reporter enzyme. The second assay involves competition between mercuric ions and an organomercury-conjugate to bind to a chelating conjugate. Several sulfur containing chelators (e.g., dithiocarbamates) and organomercurials linked to macromolecular carriers have been investigated in these assay formats. The assays detect mercuric ions in ppb/high ppt concentrations with high selectivity.

  7. Mobile Networks and Applications 2 (1997) 285301 285 Communication protocol design to facilitate re-use based on the

    E-print Network

    Khan, Javed I.

    1997-01-01

    formal descriptions for communication protocols and the effective development methodologies usedMobile Networks and Applications 2 (1997) 285­301 285 Communication protocol design to facilitate varying error rates. Similarly, handoff procedures create situations where dynamically determined change

  8. Survival and growth responses of Populus nigra, Salix elaeagnos and Alnus incana cuttings to varying levels of hydric stress

    Microsoft Academic Search

    Robert A. Francis; Angela M. Gurnell; Geoffrey E. Petts; Peter J. Edwards

    2005-01-01

    The Salicaceae and Betulaceae are important plant families within riparian ecosystems throughout the Northern hemisphere, and cuttings of species within these families are often used in riparian restoration projects due to their capacity for vegetative (asexual) propagation and rapid growth. Riparian zones can experience a wide range of hydrological conditions and establishing cuttings may be subjected to substantially varying levels

  9. Throughput Optimization in Mobile Backbone Networks

    E-print Network

    Craparo, Emily M.

    This paper describes new algorithms for throughput optimization in a mobile backbone network. This hierarchical communication framework combines mobile backbone nodes, which have superior mobility and communication capability, ...

  10. Active microrheology in active matter systems: Mobility, intermittency, and avalanches.

    PubMed

    Reichhardt, C; Reichhardt, C J Olson

    2015-03-01

    We examine the mobility and velocity fluctuations of a driven particle moving through an active matter bath of self-mobile disks for varied density or area coverage and varied activity. We show that the driven particle mobility can exhibit nonmonotonic behavior that is correlated with distinct changes in the spatiotemporal structures that arise in the active media. We demonstrate that the probe particle velocity distributions exhibit specific features in the different dynamic regimes and identify an activity-induced uniform crystallization that occurs for moderate activity levels and is distinct from the previously observed higher activity cluster phase. The velocity distribution in the cluster phase has telegraph noise characteristics produced when the probe particle moves alternately through high-mobility areas that are in the gas state and low-mobility areas that are in the dense phase. For higher densities and large activities, the system enters what we characterize as an active jamming regime. Here the probe particle moves in intermittent jumps or avalanches that have power-law-distributed sizes that are similar to the avalanche distributions observed for nonactive disk systems near the jamming transition. PMID:25871116

  11. Active Microrheology in Active Matter Systems: Mobility, Intermittency and Avalanches

    E-print Network

    C. Reichhardt; C. J. Olson Reichhardt

    2015-02-20

    We examine the mobility and velocity fluctuations of a driven particle moving through an active matter bath of self-mobile disks for varied density or area coverage and varied activity. We show that the driven particle mobility can exhibit non-monotonic behavior that is correlated with distinct changes in the spatial-temporal structures that arise in the active media. We demonstrate that the probe particle velocity distributions exhibit specific features in the different dynamic regimes, and identify an activity-induced uniform crystallization that occurs for moderate activity levels and that is distinct from the previously observed higher activity cluster phase. The velocity distribution in the cluster phase has telegraph noise characteristics produced when the probe particle moves alternately through high mobility areas that are in the gas state and low mobility areas that are in the dense phase. For higher densities and large activities, the system enters what we characterize as an active jamming regime. Here the probe particle moves in intermittent jumps or avalanches which how power-law distributed sizes that are similar to the avalanche distributions observed for non-active disk systems near the jamming transition.

  12. Characterisation of stationary phases in supercritical fluid chromatography with the solvation parameter model V. Elaboration of a reduced set of test solutes for rapid evaluation.

    PubMed

    West, C; Lesellier, E

    2007-10-26

    Characterisation of chromatographic systems with the solvation parameter model provides satisfactory information on the main non-ionic interactions developed in a chromatographic system. The procedure requires the analysis of a large number of compounds to warrant the relevance and the accuracy of the calculated models, and even if retention time is lower in supercritical fluid chromatography (SFC) than in HPLC (3-5 times lower), a decrease in the time required for that procedure would favour the use of this model in method development. Consequently, in order to establish a rapid testing procedure that would provide equivalent information, nine key solutes were carefully selected among the hundred we classically use. The separation factors calculated between these key solutes, taken two by two to establish new equations, allow the calculation of the model coefficients. The normal testing procedure is thus reduced from one or two days down to 2h. Precision and accuracy of the models provided are assessed through back-calculation of the coefficients that served for the establishment of the procedure, then through calculation of the coefficients of 13 new SFC systems. The applicability of the rapid testing procedure in SFC is evidenced with three examples: the elaboration of a system map, by varying the modifier concentration in the mobile phase, and the comparison of six ODS phases bonded on the same silica base. The simplified procedure presented here does not pretend to characterize the chromatographic systems as precisely as the complete testing procedure does, but is only aimed at rapidly evaluating the chromatographic retention characteristics when operating parameters are varied. PMID:17900598

  13. Mobile Tablet Use among Academic Physicians and Trainees

    PubMed Central

    Sclafani, Joseph; Tirrell, Timothy F.

    2014-01-01

    The rapid adoption rate and integration of mobile technology (tablet computing devices and smartphones) by physicians is reshaping the current clinical landscape. These devices have sparked an evolution in a variety of arenas, including educational media dissemination, remote patient data access and point of care applications. Quantifying usage patterns of clinical applications of mobile technology is of interest to understand how these technologies are shaping current clinical care. A digital survey examining mobile tablet and associated application usage was administered via email to all ACGME training programs. Data regarding respondent specialty, level of training, and habits of tablet usage were collected and analyzed. 40 % of respondents used a tablet, of which the iPad was the most popular. Nearly half of the tablet owners reported using the tablet in clinical settings; the most commonly used application types were point of care and electronic medical record access. Increased level of training was associated with decreased support for mobile computing improving physician capabilities and patient interactions. There was strong and consistent desire for institutional support of mobile computing and integration of mobile computing technology into medical education. While many physicians are currently purchasing mobile devices, often without institutional support, successful integration of these devices into the clinical setting is still developing. Potential reasons behind the low adoption rate may include interference of technology in doctor-patient interactions or the lack of appropriate applications available for download. However, the results convincingly demonstrate that physicians recognize a potential utility in mobile computing, indicated by their desire for institutional support and integration of mobile technology into medical education. It is likely that the use of tablet computers in clinical practice will expand in the future. Thus, we believe medical institutions, providers, educators, and developers should collaborate in ways that enhance the efficacy, reliability, and safety of integrating these devices into daily medical practice. PMID:23321961

  14. Sphingosine 1Phosphate Mobilizes Sequestered Calcium, Activates Calcium Entry, and Stimulates Deoxyribonucleic Acid Synthesis in Thyroid FRTL-5 Cells

    Microsoft Academic Search

    KID TORNQUIST; PIA SAARINEN; MINNA VAINIO; MIKAEL AHLSTROM

    1997-01-01

    Sphingosine 1-phosphate (SPP) potently mobilizes sequestered cal- cium and is a mitogen in several cell types. In the present investi- gation, we have evaluated the effect of SPP on intracellular free calcium concentration ((Ca21)i) and synthesis of DNA in thyroid FRTL-5 cells. SPP rapidly and transiently mobilized sequestered calcium and stimulated entry of extracellular calcium. The entry of calcium, but

  15. Mobile propeller dynamometer validation

    NASA Astrophysics Data System (ADS)

    Morris, Mason Wade

    With growing interest in UAVs and OSU's interest in propeller performance and manufacturing, evaluating UAV propeller and propulsion system performance has become essential. In attempts to evaluate these propellers a mobile propeller dynamometer has been designed, built, and tested. The mobile dyno has been designed to be cost effective through the ability to load it into the back of a test vehicle to create simulated forward flight characteristics. This allows much larger propellers to be dynamically tested without the use of large and expensive wind tunnels. While evaluating the accuracy of the dyno, several improvements had to be made to get accurate results. The decisions made to design and improve the mobile propeller dyno will be discussed along with attempts to validate the dyno by comparing its results against known sources. Another large part of assuring the accuracy of the mobile dyno is determining if the test vehicle will influence the flow going into the propellers being tested. The flow into the propeller needs to be as smooth and uniform as possible. This is determined by characterizing the boundary layer and accelerated flow over the vehicle. This evaluation was accomplished with extensive vehicle aerodynamic measurements with the use of full-scale tests using a pitot-rake and the actual test vehicle. Additional tests were conducted in Oklahoma State University's low speed wind tunnel with a 1/8-scale model using qualitative flow visualization with smoke. Continuing research on the mobile dyno will be discussed, along with other potential uses for the dyno.

  16. Mobile systems capability plan

    SciTech Connect

    NONE

    1996-09-01

    This plan was prepared to initiate contracting for and deployment of these mobile system services. 102,000 cubic meters of retrievable, contact-handled TRU waste are stored at many sites around the country. Also, an estimated 38,000 cubic meters of TRU waste will be generated in the course of waste inventory workoff and continuing DOE operations. All the defense TRU waste is destined for disposal in WIPP near Carlsbad NM. To ship TRU waste there, sites must first certify that the waste meets WIPP waste acceptance criteria. The waste must be characterized, and if not acceptable, subjected to additional processing, including repackaging. Most sites plan to use existing fixed facilities or open new ones between FY1997-2006 to perform these functions; small-quantity sites lack this capability. An alternative to fixed facilities is the use of mobile systems mounted in trailers or skids, and transported to sites. Mobile systems will be used for all characterization and certification at small sites; large sites can also use them. The Carlsbad Area Office plans to pursue a strategy of privatization of mobile system services, since this offers a number of advantages. To indicate the possible magnitude of the costs of deploying mobile systems, preliminary estimates of equipment, maintenance, and operating costs over a 10-year period were prepared and options for purchase, lease, and privatization through fixed-price contracts considered.

  17. Multidirectional mobilities: Advanced measurement techniques and applications

    NASA Astrophysics Data System (ADS)

    Ivarsson, Lars Holger

    Today high noise-and-vibration comfort has become a quality sign of products in sectors such as the automotive industry, aircraft, components, households and manufacturing. Consequently, already in the design phase of products, tools are required to predict the final vibration and noise levels. These tools have to be applicable over a wide frequency range with sufficient accuracy. During recent decades a variety of tools have been developed such as transfer path analysis (TPA), input force estimation, substructuring, coupling by frequency response functions (FRF) and hybrid modelling. While these methods have a well-developed theoretical basis, their application combined with experimental data often suffers from a lack of information concerning rotational DOFs. In order to measure response in all 6 DOFs (including rotation), a sensor has been developed, whose special features are discussed in the thesis. This transducer simplifies the response measurements, although in practice the excitation of moments appears to be more difficult. Several excitation techniques have been developed to enable measurement of multidirectional mobilities. For rapid and simple measurement of the loaded mobility matrix, a MIMO (Multiple Input Multiple Output) technique is used. The technique has been tested and validated on several structures of different complexity. A second technique for measuring the loaded 6-by-6 mobility matrix has been developed. This technique employs a model of the excitation set-up, and with this model the mobility matrix is determined from sequential measurements. Measurements on ``real'' structures show that both techniques give results of similar quality, and both are recommended for practical use. As a further step, a technique for measuring the unloaded mobilities is presented. It employs the measured loaded mobility matrix in order to calculate compensation forces and moments, which are later applied in order to compensate for the loading of the measurement equipment. The developed measurement techniques have been used in a hybrid coupling of a plate-and-beam structure to study different aspects of the coupling technique. Results show that RDOFs are crucial and have to be included in this case. The importance of stiffness residuals when mobilities are estimated from modal superposition is demonstrated. Finally it is shown that proper curve fitting can correct errors from inconsistently measured data.

  18. Influence of varying electroosmotic flow on the effective diffusion in electric field gradient separations.

    PubMed

    Maynes, Daniel; Tenny, Joseph; Webbd, Brent W; Lee, Milton L

    2008-02-01

    Recently the use electric field gradient focusing (EFGF) to enhance focusing of proteins has been proposed and explored to provide significant improvement in separation resolution. The objective of EFGF is to focus proteins of specific electrophoretic mobilities at distinct stationary locations in a column or channel. This can be accomplished in a capillary by allowing the electric potential to vary in the streamwise direction. Because the electric field is varying, so also is the electrokinetic force exerted on the proteins and the electroosmotic velocity of the buffer solution. Due to the varying electric field, the Taylor diffusion characteristics will also vary along the column, causing a degradation of peak widths of some proteins, dependent on their equilibrium positions and local velocity distributions. The focus of this paper is an analysis that allows characterization of the local Taylor diffusion and resulting protein band peak width as a function of the local magnitude of the EOF relative to the average fluid velocity for both cylindrical and rectangular channels. In general the analysis shows that as the ratio of the local electroosmotic velocity to the average velocity deviates from unity, the effective diffusion increases significantly. The effectiveness of EFGF devices over a range of protein diffusivities, capillary diameters, flow velocities, and electric field gradient is discussed. PMID:18200632

  19. Polycrystalline silicon thin-film transistors fabricated by rapid Joule heating method

    Microsoft Academic Search

    Y. Kaneko; N. Andoh; T. Sameshima

    2003-01-01

    We report n- and p-channel polycrystalline silicon thin film transistors (poly-Si TFTs) fabricated with a rapid joule heating method. Crystallization of 50-nm-thick silicon films and activation of phosphorus and boron atoms were successfully achieved by rapid heat diffusion via 300-nm-thick SiO2 intermediate layers from joule heating induced by electrical current flowing in chromium strips. The effective carrier mobility and the

  20. An aeronautical mobile satellite experiment

    NASA Technical Reports Server (NTRS)

    Jedrey, T. C.; Dessouky, K. I.; Lay, N. E.

    1990-01-01

    The various activities and findings of a NASA/FAA/COMSAT/INMARSAT collaborative aeronautical mobile satellite experiment are detailed. The primary objective of the experiment was to demonstrate and evaluate an advanced digital mobile satellite terminal developed at the Jet Propulsion Laboratory under the NASA Mobile Satellite Program. The experiment was a significant milestone for NASA/JPL, since it was the first test of the mobile terminal in a true mobile satellite environment. The results were also of interest to the general mobile satellite community because of the advanced nature of the technologies employed in the terminal.

  1. The mobility of water soluble organic compounds in soils from the land application of petroleum waste sludge 

    E-print Network

    Evans, Gordon Barcus

    1979-01-01

    CITED VITA 59 59 59 61 66 LIST OF TABLES Page Table 1 ? Water soluble fractions from vari- ous petroleum stocks. , 16 Table 2 - Sieved soils properties. Table 3 - Waste sludge characteristics. . 24 . 26 Table Table 4 ? Soil column.... Page . 23 . 30 . 41 Fig. 4 GLC visualization of soil TLC mobility distributions for the Nacogdoches series. . 42 Fig. 5 GLC visualization of soil TLC mobility distributions for the Norwood series. . . . 43 Fig. 6 Fig. 7 Mobility distribution...

  2. Development of the Seating and Mobility Script Concordance Test for Spinal Cord Injury: Obtaining Content Validity Evidence

    ERIC Educational Resources Information Center

    Cohen, Laura J.; Fitzgerald, Shirley G.; Lane, Suzanne; Boninger, Michael L.

    2005-01-01

    The appropriateness of a consumer's seating and mobility system varies considerably depending on the competence, proficiency, and experience of the professionals assisting the user. At present, there is a scarcity of skilled and knowledgeable therapists to evaluate and recommend seating and mobility devices. There is also a lack of measurement…

  3. Mobility control agents

    SciTech Connect

    Hammershaimb, E.C.; KuugKraa, V.A.

    1983-06-01

    Enhanced oil recovery (EOR) by means of steam drive, for heavier crudes, and CO/sub 2/ flooding, for lighter, mobilizes oil left behind by more conventional methods and displaces it to producing wells. In higher mobility, fingering, and flow of the drive or flood substance through low permeability paths, reduces the efficiency of EOR. Mobility control agents block these permeable paths. Five tests, two at Santa Fe Energy's Midway-Sunset field, one at Conoco's Cat Canyon, and two at Texaco's San Ardo field, are made to address the excessive channelling of steam through ''theif'' zones, and the progressive increase in steam flow through oil depleted, already swept zones. The success of the tests demonstrates the viability of the process by diverting steam, increasing oil recovery, increasing oil-steam ratio, and improving the water cut.

  4. Exxon and Mobil Merge

    NSDL National Science Digital Library

    Waters, Megan.

    This week's In the News looks at the recent megamerger between Exxon Corporation and Mobil Corporation. The ten resources discussed provide news, financial data, and opinion on the largest corporate purchase to date as well as information on the oil industry in general. In a move deemed "the end of the age of OPEC" by Wall Street Journal reporter Bernard Wysocki, Exxon Chairman Lee R. Raymond formally bought Mobil Oil Company for $74.4 billion on December 1, 1998. Critics of the deal await antitrust scrutiny, although officials at Exxon Mobil, as the new company will be called, cite a "volatile world economy" and the need to "enhance global competition" as central to their decision.

  5. Mobile Phone Terminal

    NASA Technical Reports Server (NTRS)

    1978-01-01

    In the photo, an employee of a real estate firm is contacting his office by means of HICOM, an advanced central terminal for mobile telephones. Developed by the Orlando Division of Martin Marietta Aerospace, Orlando, Florida, and manufactured by Harris Corporation's RF Division, Rochester, N.Y., HICOM upgrades service to users, provides better system management to telephone companies, and makes more efficient use of available mobile telephone channels through a computerized central control terminal. The real estate man, for example, was able to dial his office and he could also have direct-dialed a long distance number. Mobile phones in most areas not yet served by HICOM require an operator's assistance for both local and long distance calls. HICOM improves system management by automatically recording information on all calls for accurate billing, running continual performance checks on its own operation, and reporting any malfunctions to a central office.

  6. Demonstration of Mobile Auto-GPS for Large Scale Human Mobility Analysis

    NASA Astrophysics Data System (ADS)

    Horanont, Teerayut; Witayangkurn, Apichon; Shibasaki, Ryosuke

    2013-04-01

    The greater affordability of digital devices and advancement of positioning and tracking capabilities have presided over today's age of geospatial Big Data. Besides, the emergences of massive mobile location data and rapidly increase in computational capabilities open up new opportunities for modeling of large-scale urban dynamics. In this research, we demonstrate the new type of mobile location data called "Auto-GPS" and its potential use cases for urban applications. More than one million Auto-GPS mobile phone users in Japan have been observed nationwide in a completely anonymous form for over an entire year from August 2010 to July 2011 for this analysis. A spate of natural disasters and other emergencies during the past few years has prompted new interest in how mobile location data can help enhance our security, especially in urban areas which are highly vulnerable to these impacts. New insights gleaned from mining the Auto-GPS data suggest a number of promising directions of modeling human movement during a large-scale crisis. We question how people react under critical situation and how their movement changes during severe disasters. Our results demonstrate a case of major earthquake and explain how people who live in Tokyo Metropolitan and vicinity area behave and return home after the Great East Japan Earthquake on March 11, 2011.

  7. Human organisms in varying gravicondition on Earth

    NASA Astrophysics Data System (ADS)

    Kochemasov, G.

    Cosmic biology shows that human organisms in conditions of weightlessness or microgravity release themselves of Ca. Normal Ca in bones is needed for normal gravity conditions and become unnecessary in merely 100 km above Earth. The loss of Ca occurs very effectively and rapidly: just a few months in conditions of weightlessness is enough to bring an important Ca loss from a skeleton. The 100 km range is not found on the terrestrial surface but a few km vertical range between planetary tectonic blocks is characteristic for the planet Earth. And what is important, this range is very stable in a time scale of the human beings existence on Earth, say, a few million years. The most uplifted tectonic block-sector of Earth - African continent - constantly rises during the last few million years. In the tectonic sectoral structure of the eastern hemisphere with the center in the Pamirs-Hindukush uplifted African sector (+ +) is opposed by the also uplifted Asian sector (+). Both risen sectors are separated by two subsided sectors: Eurasian ( -) and Indoceanic (- -). The sectoral tectonics is dup licated in other geospheres (from the core to atmosphere) and is rather clear in distribution of the great human races. African sector is occupied by negroids, Asian by mongoloids, Eurasian by europeoids, Indoceanic by australoids. What is a principal difference between them in physical structure? The great races of the risen sectors are less hairy with rare curly or straight hairs and have lighter skeleton. The great races of the fallen sectors are shaggy with dense soft curly hairs and have denser bones. Otherwise, in the risen sectors with more uplifted surfaces and diminished gravity developed "lighter" organisms than in the fallen sectors with subsided surfaces and increased gravity. An evolution during million of years in conditions of very small gravity gradient gave a result which can be compared with a very short time evolution in conditions of very sharp drop in gravity (cosmic experiments). Lightening bone tissues corresponds to reducing gravity. The timescale of million years is probably too much for achieving noticeable results in changing flexible human races by changing gravity. Thus, 2000 to 3000 years was sufficient to transform mongoloids to Polynesians (actually europeoids) and europeoids (hamits) to semi-africans in Ethiopia. In the first case migration was from sector + to segment -, in the second case from sector - to sector + +. Ref.: [1] Kochemasov G.(2000) Geoid and formation by its planetary gravity fields great human races and Polynesian "superrace" // 33rd COSPAR Sci. Assem., Warsaw, Abstr. (CD-ROM); [2] Kochemasov G.(1998) Unequal gravity sectors and great human races // 32nd COSPAR SCI, Assem., Nagoya, Abstr.,p.384.

  8. Mining High Utility Mobile Sequential Patterns in Mobile Commerce Environments

    Microsoft Academic Search

    Bai-En Shie; Hui-Fang Hsiao; Vincent S. Tseng; Philip S. Yu

    2011-01-01

    \\u000a Mining user behaviors in mobile environments is an emerging and important topic in data mining fields. Previous researches\\u000a have combined moving paths and purchase transactions to find mobile sequential patterns. However, these patterns cannot reflect\\u000a actual profits of items in transaction databases. In this work, we explore a new problem of mining high utility mobile sequential\\u000a patterns by integrating mobile

  9. A security framework for mobile-to-mobile payment network

    Microsoft Academic Search

    M. L. Das; A. Saxena; V. P. Gulati

    2005-01-01

    This paper presents a framework for a mobile-to-mobile payment system, where a mobile phone, with or without SIM card, is used as an EMV payment instrument and is linked to a debit or credit account in a bank to pay any merchant who has a mobile phone or an on-line EMV capable terminal. In a single phone, multiple credit or

  10. Mobility of Plasmids†

    PubMed Central

    Smillie, Chris; Garcillán-Barcia, M. Pilar; Francia, M. Victoria; Rocha, Eduardo P. C.; de la Cruz, Fernando

    2010-01-01

    Summary: Plasmids are key vectors of horizontal gene transfer and essential genetic engineering tools. They code for genes involved in many aspects of microbial biology, including detoxication, virulence, ecological interactions, and antibiotic resistance. While many studies have decorticated the mechanisms of mobility in model plasmids, the identification and characterization of plasmid mobility from genome data are unexplored. By reviewing the available data and literature, we established a computational protocol to identify and classify conjugation and mobilization genetic modules in 1,730 plasmids. This allowed the accurate classification of proteobacterial conjugative or mobilizable systems in a combination of four mating pair formation and six relaxase families. The available evidence suggests that half of the plasmids are nonmobilizable and that half of the remaining plasmids are conjugative. Some conjugative systems are much more abundant than others and preferably associated with some clades or plasmid sizes. Most very large plasmids are nonmobilizable, with evidence of ongoing domestication into secondary chromosomes. The evolution of conjugation elements shows ancient divergence between mobility systems, with relaxases and type IV coupling proteins (T4CPs) often following separate paths from type IV secretion systems. Phylogenetic patterns of mobility proteins are consistent with the phylogeny of the host prokaryotes, suggesting that plasmid mobility is in general circumscribed within large clades. Our survey suggests the existence of unsuspected new relaxases in archaea and new conjugation systems in cyanobacteria and actinobacteria. Few genes, e.g., T4CPs, relaxases, and VirB4, are at the core of plasmid conjugation, and together with accessory genes, they have evolved into specific systems adapted to specific physiological and ecological contexts. PMID:20805406

  11. Plant Mobile Small RNAs

    PubMed Central

    Dunoyer, Patrice; Melnyk, Charles; Molnar, Attila; Slotkin, R. Keith

    2013-01-01

    In plants, RNA silencing is a fundamental regulator of gene expression, heterochromatin formation, suppression of transposable elements, and defense against viruses. The sequence specificity of these processes relies on small noncoding RNA (sRNA) molecules. Although the spreading of RNA silencing across the plant has been recognized for nearly two decades, only recently have sRNAs been formally demonstrated as the mobile silencing signals. Here, we discuss the various types of mobile sRNA molecules, their short- and long-range movement, and their function in recipient cells. PMID:23818501

  12. Mobile Communities - new business opportunities for mobile network operators?

    Microsoft Academic Search

    Natalie Fremuth; Andreas Tasch; Michael Fränkle

    This paper presents the results of an analysis of potential revuenue streams and business models for mobile communities from a mobile network operator's perspective. It gives a contribution to the answer of the actual business challenges in the mobile carrier sector where operators are continously searching for new innovative services and business models to increase their revenues and financial performance

  13. Mobile cluster based call admission control in wireless mobile networks

    Microsoft Academic Search

    Jeong-Jae Won; Eui-seok Hwang; Hyong-Woo Lee; Choong-Ho Cho

    2003-01-01

    For an efficient and effective connection admission control scheme in wireless mobile network, we propose mobile clustering based distributed call admission control (MC-DCA) scheme, which uses passive reservation information for predicting user mobility. Also, our scheme evaluates the prediction time that considers the call duration time and call dwell time before handoff neighbor cells for evaluating the overload probability.

  14. Mobility-Induced Service Migration in Mobile Micro-Clouds

    E-print Network

    Leung, Kin K.

    Mobility-Induced Service Migration in Mobile Micro-Clouds Shiqiang Wang, Rahul Urgaonkar, Ting He.zafer.us@ieee.org, §kevin.s.chan.civ@mail.mil Abstract--Mobile micro-cloud is an emerging technology in distributed a centralized service may suffer from poor connectivity and long latency. Different from the traditional cloud

  15. A Distributed Implementation of Mobile Nets as Mobile Agents

    E-print Network

    Torino, Università di

    A Distributed Implementation of Mobile Nets as Mobile Agents Nadia Busi and Luca Padovani-mail: {busi,lpadovan}@cs.unibo.it Abstract. Mobile nets arise as a combination of the name managing techniques of the -calculus with the representation of concurrency and locality of Petri nets. We propose MAGNETs, a variant

  16. Rapid Evaporation of microbubbles

    NASA Astrophysics Data System (ADS)

    Gautam, Jitendra; Esmaeeli, Asghar

    2008-11-01

    When a liquid is heated to a temperature far above its boiling point, it evaporates abruptly. Boiling of liquid at high temperatures can be explosive and destructive, and poses a potential hazard for a host of industrial processes. Explosive boiling may occur if a cold and volatile liquid is brought into contact with a hot and non-volatile liquid, or if a liquid is superheated or depressurized rapidly. Such possibilities are realized, for example, in the depressurization of low boiling point liquefied natural gas (LNG) in the pipelines or storage tanks as a result of a leak. While boiling of highly heated liquids can be destructive at macroscale, the (nearly) instantaneous pace of the process and the release of large amount of kinetic energy make the phenomena extremely attractive at microscale where it is possible to utilize the released energy to derive micromechanical systems. For instance, there is currently a growing interest in micro-explosion of liquid for generation of micro bubbles for actuation purposes. The aim of the current study is to gain a fundamental understanding of the subject using direct numerical simulations. In particular, we seek to investigate the boundary between stable and unstable nucleus growth in terms of the degree of liquid superheat and to compare the dynamics of unstable and stable growth.

  17. Strong Coupling Problem with Time-Varying Sound Speed

    E-print Network

    Austin Joyce; Justin Khoury

    2011-09-02

    For a single scalar field with unit sound speed minimally coupled to Einstein gravity, there are exactly three distinct cosmological solutions which produce a scale invariant spectrum of curvature perturbations in a dynamical attractor background, assuming vacuum initial conditions: slow-roll inflation; a slowly contracting adiabatic ekpyrotic phase, described by a rapidly-varying equation of state; and an adiabatic ekpyrotic phase on a slowly expanding background. Of these three, only inflation remains weakly coupled over a wide range of modes, the other scenarios can produce at most 12 e-folds of scale invariant and gaussian modes. In this paper, we investigate how allowing the speed of sound of fluctuations to evolve in time affects this classification. While in the presence of a variable sound speed there are many more scenarios which are scale invariant at the level of the two-point function, they generically suffer from strong coupling problems similar to those in the canonical case. There is, however, an exceptional case with superluminal sound speed, which suppresses non-gaussianities and somewhat alleviates strong coupling issues. We focus on a particular realization of this limit and show these scenarios are constrained and only able to produce at most 28 e-folds of scale invariant and gaussian perturbations. A similar bound should hold more generally --- the condition results from the combined requirements of matching the observed amplitude of curvature perturbations, demanding that the Hubble parameter remain sub-Planckian and keeping non-gaussianities under control. We therefore conclude that inflation remains the unique scenario, assuming a single degree of freedom on an attractor background, capable of producing arbitrarily many scale invariant modes while remaining weakly coupled. Alternative mechanisms must inevitably be unstable or rely on multiple degrees of freedom.

  18. Strong coupling problem with time-varying sound speed

    SciTech Connect

    Joyce, Austin; Khoury, Justin [Center for Particle Cosmology, Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19104 (United States)

    2011-10-15

    For a single scalar field with unit sound speed minimally coupled to Einstein gravity, there are exactly three distinct cosmological solutions which produce a scale invariant spectrum of curvature perturbations in a dynamical attractor background, assuming vacuum initial conditions: slow-roll inflation; a slowly contracting adiabatic ekpyrotic phase, described by a rapidly-varying equation of state; and an adiabatic ekpyrotic phase on a slowly expanding background. Of these three, only inflation remains weakly coupled over a wide range of modes, while the other scenarios can produce at most 12 e-folds of scale invariant and Gaussian modes. In this paper, we investigate how allowing the speed of sound of fluctuations to evolve in time affects this classification. While in the presence of a variable sound speed there are many more scenarios which are scale invariant at the level of the two-point function, they generically suffer from strong coupling problems similar to those in the canonical case. There is, however, an exceptional case with superluminal sound speed, which suppresses non-Gaussianities and somewhat alleviates strong coupling issues. We focus on a particular realization of this limit and show these scenarios are constrained and only able to produce at most 28 e-folds of scale invariant and Gaussian perturbations. A similar bound should hold more generally - the condition results from the combined requirements of matching the observed amplitude of curvature perturbations, demanding that the Hubble parameter remain sub-Planckian and keeping non-Gaussianities under control. We therefore conclude that inflation remains the unique cosmological scenario, assuming a single degree of freedom on an attractor background, capable of producing arbitrarily many scale invariant modes while remaining weakly coupled. Alternative mechanisms must inevitably be unstable or rely on multiple degrees of freedom.

  19. Morphing content in mobile applications

    E-print Network

    Wang, Kevin Y

    2009-01-01

    Smart phones are quickly becoming an integral part of our everyday lives. However, the mobile industry is still young, and the full potential of mobile phones has yet to be tapped. In this thesis, I present the design of ...

  20. Mobilizing Producers toward Environmental Sustainability

    E-print Network

    8 Mobilizing Producers toward Environmental Sustainability: The Prospects for Market;155Mobilizing Producers toward Environmental Sustainability set of rules and incentives that provide, focusing especially on the policy approach that I emphasize in this chapter: market-oriented regulations