These are representative sample records from Science.gov related to your search topic.
For comprehensive and current results, perform a real-time search at Science.gov.
1

RAPID COMMUNICATION Yolk Testosterone Varies With Sex in  

E-print Network

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

Wade, Juli

2

Local non-Gaussianity from rapidly varying sound speeds  

E-print Network

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.

Jon Emery; Gianmassimo Tasinato; David Wands

2012-07-16

3

Rapid electrochemical detection on a mobile phone.  

PubMed

We present a compact mobile phone platform for rapid, quantitative biomolecular detection. This system consists of an embedded circuit for signal processing and data analysis, and disposable microfluidic chips for fluidic handling and biosensing. Capillary flow is employed for sample loading, processing, and pumping to enhance operational portability and simplicity. Graphical step-by-step instructions displayed on the phone assists the operator through the detection process. After the completion of each measurement, the results are displayed on the screen for immediate assessment and the data is automatically saved to the phone's memory for future analysis and transmission. Validation of this device was carried out by detecting Plasmodium falciparum histidine-rich protein 2 (PfHRP2), an important biomarker for malaria, with a lower limit of detection of 16 ng mL(-1) in human serum. The simple detection process can be carried out with two loading steps and takes 15 min to complete each measurement. Due to its compact size and high performance, this device offers immense potential as a widely accessible, point-of-care diagnostic platform, especially in remote and rural areas. In addition to its impact on global healthcare, this technology is relevant to other important applications including food safety, environmental monitoring and biosecurity. PMID:23689554

Lillehoj, Peter B; Huang, Ming-Chun; Truong, Newton; Ho, Chih-Ming

2013-08-01

4

Rapid world modelling from a mobile platform  

SciTech Connect

The ability to successfully use and interact with a computerized world model is dependent on the ability to create an accurate world model. The goal of this project was to develop a prototype system to remotely deploy sensors into a workspace, collect surface information, and rapidly build an accurate world model of that workspace. A key consideration was that the workspace areas are typically hazardous environments, where it is difficult or impossible for humans to enter. Therefore, the system needed to be fully remote, with no external connections. To accomplish this goal, an electric, mobile platform with battery power sufficient for both the platform and sensor electronics was procured and 3D range sensors were deployed on the platform to capture surface data within the workspace. A radio Ethernet connection was used to provide communications to the vehicle and all on-board electronics. Video from on-board cameras was also transmitted to the base station and used to teleoperate the vehicle. Range data generated by the on-board 3D sensors was transformed into surface maps, or models. Registering the sensor location to a consistent reference frame as the platform moved through the workspace allowed construction of a detailed 3D world model of the extended workspace.

Barry, R.E.; Jones, J.P. [Oak Ridge National Lab., TN (United States); Little, C.Q. [Sandia National Labs., Albuquerque, NM (United States); Wilson, C.W.

1997-04-01

5

RAPID ADAPTATION FOR MOBILE SPEECH APPLICATIONS Michiel Bacchiani  

E-print Network

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

Cortes, Corinna

6

A Multiscale Analysis of Diffusions on Rapidly Varying Surfaces  

NASA Astrophysics Data System (ADS)

Lateral diffusion of molecules on surfaces plays a very important role in various biological processes, including lipid transport across the cell membrane, synaptic transmission, and other phenomena such as exo- and endocytosis, signal transduction, chemotaxis, and cell growth. In many cases, the surfaces can possess spatial inhomogeneities and/or be rapidly changing shape. Using a generalization of the model for a thermally excited Helfrich elastic membrane, we consider the problem of lateral diffusion on quasi-planar surfaces, possessing both spatial and temporal fluctuations. Using results from homogenization theory, we show that, under the assumption of scale separation between the characteristic length and timescales of the membrane fluctuations and the characteristic scale of the diffusing particle, the lateral diffusion process can be well approximated by a Brownian motion on the plane with constant diffusion tensor D that depends on a highly nonlinear way on the detailed properties of the surface. The effective diffusion tensor will depend on the relative scales of the spatial and temporal fluctuations, and for different scaling regimes, we prove the existence of a macroscopic limit in each case.

Duncan, A. B.; Elliott, C. M.; Pavliotis, G. A.; Stuart, A. M.

2015-02-01

7

A Multiscale Analysis of Diffusions on Rapidly Varying Surfaces  

NASA Astrophysics Data System (ADS)

Lateral diffusion of molecules on surfaces plays a very important role in various biological processes, including lipid transport across the cell membrane, synaptic transmission, and other phenomena such as exo- and endocytosis, signal transduction, chemotaxis, and cell growth. In many cases, the surfaces can possess spatial inhomogeneities and/or be rapidly changing shape. Using a generalization of the model for a thermally excited Helfrich elastic membrane, we consider the problem of lateral diffusion on quasi-planar surfaces, possessing both spatial and temporal fluctuations. Using results from homogenization theory, we show that, under the assumption of scale separation between the characteristic length and timescales of the membrane fluctuations and the characteristic scale of the diffusing particle, the lateral diffusion process can be well approximated by a Brownian motion on the plane with constant diffusion tensor that depends on a highly nonlinear way on the detailed properties of the surface. The effective diffusion tensor will depend on the relative scales of the spatial and temporal fluctuations, and for different scaling regimes, we prove the existence of a macroscopic limit in each case.

Duncan, A. B.; Elliott, C. M.; Pavliotis, G. A.; Stuart, A. M.

2015-04-01

8

Error eliminating rapid ultrasonic firing for mobile robot obstacle avoidance  

Microsoft Academic Search

This paper introduces error eliminating rapid ultrasonic firing (EERUF), a new method for firing multiple ultrasonic sensors in mobile robot applications. EERUF allows ultrasonic sensors to fire at rates that are five to ten times faster than those customary in conventional applications. This is possible because EERUF reduces the number of erroneous readings due to ultrasonic noise by one to

Johann Borenstein; Yoram Koren

1995-01-01

9

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 are encountered, so well designed channel esti- mators are crucial for obtaining adequate performance. Estimates; Lars Lindbom and Magnus Falkenstrom are with Ericsson In- fotech, PO Box 1038, SE-65115 Karlstad

10

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

E-print Network

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

Tartakovsky, Daniel M.

11

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

Microsoft Academic Search

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

Claude Samson

1993-01-01

12

Rapid Prototyping a Collections-based Mobile Wayfinding Application  

Microsoft Academic Search

This research presents the results of a project that investigated how students use a library developed mobile app to locate books in the library. The study employed a methodology of formative evaluation so that the development of the mobile app would be informed by user preferences for next generation wayfinding systems. A key finding is the importance of gathering ongoing

Jim Hahn; Alaina Morales

2011-01-01

13

Rapid Prototyping a Collections-Based Mobile Wayfinding Application  

ERIC Educational Resources Information Center

This research presents the results of a project that investigated how students use a library developed mobile app to locate books in the library. The study employed a methodology of formative evaluation so that the development of the mobile app would be informed by user preferences for next generation wayfinding systems. A key finding is the…

Hahn, Jim; Morales, Alaina

2011-01-01

14

Rapid Generation of Realistic Mobility Models for VANET  

Microsoft Academic Search

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

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

2007-01-01

15

Towards Rapid Generation and Visualisation of Large 3D Urban Landscapes for Mobile Device Navigation  

E-print Network

Towards Rapid Generation and Visualisation of Large 3D Urban Landscapes for Mobile Device of Creative Computing, Coventry University Stuart Baker4 Alcatel-Lucent Telecom Limited UK ABSTRACT In this paper a procedural 3D modelling solution for mobile devices is presented based on scripting algorithms

North Carolina at Chapel Hill, University of

16

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

PubMed Central

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

2014-01-01

17

Controlling mobility via rapidly oscillating time-periodic stimulus  

E-print Network

To address the dynamics of a Brownian particle on a periodic symmetric substrate under high-frequency periodic forcing with a vanishing time average, we construct an effective Langevin dynamics by invoking Kapitza-Landau time window. Our result is then exploited to simulate the mobility both for original and effective dynamics which are in good agreement with theoretical predictions. This close agreement and the enhancement of mobility are very robust against the tailoring of amplitude-to-frequency ratio which substantiates the correctness of our calculation. Present results may be illuminating for understanding the dynamics of cold atoms in electromagnetic fields.

Sarkar, Prasun; Shit, Anindita; Chattopadhyay, Sudip; Chaudhuri, Jyotipratim Ray; Banik, Suman K

2014-01-01

18

Controlling mobility via rapidly oscillating time-periodic stimulus  

E-print Network

To address the dynamics of a Brownian particle on a periodic symmetric substrate under high-frequency periodic forcing with a vanishing time average, we construct an effective Langevin dynamics by invoking Kapitza-Landau time window. Our result is then exploited to simulate the mobility both for original and effective dynamics which are in good agreement with theoretical predictions. This close agreement and the enhancement of mobility are very robust against the tailoring of amplitude-to-frequency ratio which substantiates the correctness of our calculation. Present results may be illuminating for understanding the dynamics of cold atoms in electromagnetic fields.

Prasun Sarkar; Alok Kumar Maity; Anindita Shit; Sudip Chattopadhyay; Jyotipratim Ray Chaudhuri; Suman K Banik

2014-03-26

19

IEEE TRANSACTIONS ON COMMUNICATIONS, VOL. 49, NO. 12, DECEMBER 2001 2207 Tracking of Time-Varying Mobile Radio  

E-print Network

-Varying Mobile Radio Channels--Part I: The Wiener LMS Algorithm Lars Lindbom, Mikael Sternad, Senior Member, IEEE; revised January 15, 2001. L. Lindbom is with Ericsson Infotech, SE-65115 Karlstad, Sweden (e-mail: Lars discussed by Benveniste and co-workers [4], [5]. This work, as well as many others, was focused on cases

20

Rapid building damage assessment system using mobile phone technology  

NASA Astrophysics Data System (ADS)

One common scenario during disasters such as earthquakes is that the activity of damage field reconnaissance on site is not well-coordinated. For example in Italy the damage assessment of structures after an earthquake is managed from the Italian Emergency Authority, using printed forms (AeDES) which are filled by experts on site generating a lot of confusion in filling and transferring the forms to the Disaster Management Operative Center. Because of this, the paper explores the viability of using mobile communication technologies (smart phones) and the Web to develop response systems that would aid communities after a major disaster, providing channels for allowing residents and responders of uploading and distributing information, related to structural damages coordinating the damage field reconnaissance. A mobile application that can be run by residents on smart phones has been developed, to give an initial damage evaluation of the area, which is going to be very useful when resources (e.g. the number of experts is limited). The mobile application has been tested for the first time during 2012 Emilia earthquake to enhance the emergency response, showing the efficiency of the proposed method in statistical terms comparing the proposed procedure with the standard procedure.

Cimellaro, Gian Paolo; Scura, G.; Renschler, C. S.; Reinhorn, A. M.; Kim, H. U.

2014-09-01

21

Contributed Paper Rapid Assessment of Risks to a Mobile Marine  

E-print Network

Barrier Reef World Heritage Area [GBRWHA]). We developed a rapid approach to assess risk to dugongs habitats: netting, indigenous hunting, trawling, vessel traffic, and poor-quality terrestrial runoff. We then quantified and compared the distribution of these factors with a spatially explicit model of dugong

Marsh, Helene

22

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

E-print Network

these torsional Alfvén waves to perturbations with respect to a slowly evolving basic state characterized of torsional Alfvén waves that can be generalized to nonaxisymmetric motions, such as the almost axially in jets propagating as Alfvén waves are shown to arise in a rapidly rotating spherical shell permeated

Recanati, Catherine

23

Axial invariance of rapidly varying diffusionless motions in the Earth's core  

E-print Network

´en wave type save for geometrical fac- tors. Braginsky (1970) assigned these torsional Alfv´en waves jets propagating as Alfv´en waves are shown to arise in a rapidly rotating spherical shell permeated's core, Magneto-hydrodynamic waves, geomagnetic field, core flow 1 Introduction For the last ten years

Paris-Sud XI, Université de

24

Rapid Assessment of Contrast Sensitivity with Mobile Touch-screens  

NASA Technical Reports Server (NTRS)

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,

Mulligan, Jeffrey B.

2013-01-01

25

Development of a Rapid Obstacle Sensing System using Sonar Ring for Mobile Robot  

Microsoft Academic Search

A sensing system using sonar ring for mobile robot capable of rapid detection and avoidance of obstacles has been developed. In the system, a method of firing all ultrasonic sensors on a sonar ring simultaneously is used and to eliminate error data due to crosstalks in the simultaneous firing, a filtering method based on pattern matching using neural network is

Aiguo Ming; Kazuhiro Kajihara; Makoto Kajitani; Makoto Shimojo

2002-01-01

26

Rapid profiling and identification of anthocyanins in fruits with Hadamard transform ion mobility mass spectrometry.  

PubMed

The use of Hadamard transform ion mobility mass spectrometry (HT-IMMS) in the profiling of anthocyanins from different fruits is presented. Samples extracted with acidic methanol and purified with solid phase extraction were analyzed with direct IMMS infusion. The separation of various anthocyanins was achieved within 30s with resolving powers up to 110. The ion mobility drift times correlated with their mass-to-charge ratios with a correlation coefficient of 0.979 to produce a trend line that was characteristic for anthocyanins. Isomers with the same anthocyanidin but different hexoses were differentiated by ion mobility spectrometry. Furthermore, mobility separated ions underwent collision induced dissociation at the IMMS interface to provide MS/MS spectra. These fragmentation spectra aided in the identification of anthocyanidins via the loss of the saccharide groups. IMMS appears to be a rapid and efficient approach for profiling and identifying anthocyanins. PMID:25660880

Liu, Wenjie; Zhang, Xing; Siems, William F; Hill, Herbert H; Yin, Dulin

2015-06-15

27

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

NASA Astrophysics Data System (ADS)

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.

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

28

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

PubMed Central

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

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

2013-01-01

29

A pilot biomedical engineering course in rapid prototyping for mobile health.  

PubMed

Rapid prototyping of medically assistive mobile devices promises to fuel innovation and provides opportunity for hands-on engineering training in biomedical engineering curricula. This paper presents the design and outcomes of a course offered during a 16-week semester in Fall 2011 with 11 students enrolled. The syllabus covered a mobile health design process from end-to-end, including storyboarding, non-functional prototypes, integrated circuit programming, 3D modeling, 3D printing, cloud computing database programming, and developing patient engagement through animated videos describing the benefits of a new device. Most technologies presented in this class are open source and thus provide unlimited "hackability". They are also cost-effective and easily transferrable to other departments. PMID:24110238

Stokes, Todd H; Venugopalan, Janani; Hubbard, Elena N; Wang, May D

2013-01-01

30

Adaptive control of the unique mobility EV drive system to account for time-varying battery parameters  

SciTech Connect

Unique Mobility developed an electric vehicle drive system which is being used in the BMW E1. This system is comprised of a permanent magnet brushless DC motor, amplifier, and microprocessor controller. The system is capable of high torque (150 Nm) at low speeds (< 2,000 rpm) and constant power (32 kW) at higher speeds (to 8,000 rpm). The design of the system utilizes a 6 step drive in combination with microprocessor control. The topology of the drive was designed to maximize overall system efficiency. The control system was designed to operate smoothly while transitioning between different regions of operation. The controller must also regulate the torque to stay within all of the safety limits, two of which are under voltage and over voltage. The under voltage limit is used to prevent fully discharging the batteries to prolong their life, and the over voltage limit is necessary to protect the power devices in the amplifier and/or prevent outgassing of the battery. The maximum voltage from the motor in regeneration is a function of the regenerated current, the internal battery impedance in regeneration, and the open circuit bus voltage.the open circuit bus voltage and the internal battery impedance in regeneration varies with each different battery technology, and the batteries` short and long term charge/discharge history. The described drive system adapts to any battery technology by limiting the user to only the maximum instantaneous power that the battery can provide (in motoring) or accept (in regeneration).

Kopf, C. [Unique Mobility, Golden, CO (United States)

1995-07-01

31

Heterogeneity of high-mobility-group protein 2. Enrichment of a rapidly migrating form in testis.  

PubMed Central

A determination of the absolute amounts of high-mobility-group proteins 1 and 2 (HMG1 and HMG2) in rat tissues demonstrated that amounts of HMG2 were low in non-proliferating tissues, somewhat higher in proliferating and lymphoid tissues, but were extremely elevated in the testis. This increase was due to a germ-cell-specific form of HMG2 with increased mobility relative to somatic HMG2 on acid/urea/polyacrylamide-gel electrophoresis. To determine if the findings in the rat were a general feature of spermatogenesis, testis (germinal), spleen (lymphoid), and liver (non-proliferating) tissues from various vertebrate species were examined for their relative amounts of HMG1 and HMG2, and for HMG2 heterogeneity. Bull, chimpanzee, cynomologus monkey, dog, gopher, guinea pig, hamster, mouse, opossum, rabbit, rat, rhesus monkey, squirrel and toad (Xenopus) tissues were analysed. Nearly all species showed relatively high contents of HMG2 in testis tissue, whereas HMG1 contents were similar in all species and tissues. Ten of thirteen species showed a rapidly migrating HMG2 subtype in testis tissue, separable by acid/urea/polyacrylamide-gel electrophoresis. Xenopus, which lacks HMG2 in somatic tissues, showed an HMG2-like protein in testis tissue. Although the rapidly migrating HMG2 subtype in species other than rat was not testis-specific, it was always enriched in the testis. This study indicates that increased amounts of HMG2 and the enrichment of a rapidly migrating HMG2 subtype are general features of spermatogenic cells. Images Fig. 1. Fig. 2. Fig. 3. PMID:4038257

Bucci, L R; Brock, W A; Meistrich, M L

1985-01-01

32

RAPID  

Cancer.gov

Rapid Access to Preventive Intervention Development (RAPID) Program About RAPID Description and Objectives of the Program Oversight RAPID Is Not... Frequently Asked Questions Application Information Format of Applications Address for Applications

33

Acute sterol o-acyltransferase 2 (SOAT2) knockdown rapidly mobilizes hepatic cholesterol for fecal excretion.  

PubMed

The primary risk factor for atherosclerotic cardiovascular disease is LDL cholesterol, which can be reduced by increasing cholesterol excretion from the body. Fecal cholesterol excretion can be driven by a hepatobiliary as well as a non-biliary pathway known as transintestinal cholesterol efflux (TICE). We previously showed that chronic knockdown of the hepatic cholesterol esterifying enzyme sterol O-acyltransferase 2 (SOAT2) increased fecal cholesterol loss via TICE. To elucidate the initial events that stimulate TICE, C57Bl/6 mice were fed a high cholesterol diet to induce hepatic cholesterol accumulation and were then treated for 1 or 2 weeks with an antisense oligonucleotide targeting SOAT2. Within 2 weeks of hepatic SOAT2 knockdown (SOAT2HKD), the concentration of cholesteryl ester in the liver was reduced by 70% without a reciprocal increase in hepatic free cholesterol. The rapid mobilization of hepatic cholesterol stores resulted in a ? 2-fold increase in fecal neutral sterol loss but no change in biliary cholesterol concentration. Acute SOAT2HKD increased plasma cholesterol carried primarily in lipoproteins enriched in apoB and apoE. Collectively, our data suggest that acutely reducing SOAT2 causes hepatic cholesterol to be swiftly mobilized and packaged onto nascent lipoproteins that feed cholesterol into the TICE pathway for fecal excretion. PMID:24901470

Marshall, Stephanie M; Gromovsky, Anthony D; Kelley, Kathryn L; Davis, Matthew A; Wilson, Martha D; Lee, Richard G; Crooke, Rosanne M; Graham, Mark J; Rudel, Lawrence L; Brown, J Mark; Temel, Ryan E

2014-01-01

34

Rapid characterization of naphthenic acids using differential mobility spectrometry and mass spectrometry.  

PubMed

To analyze the naphthenic acid content of environmental waters quickly and efficiently, we have developed a method that employs differential mobility spectrometry (DMS) coupled to mass spectrometry (MS). This technique combines the benefits of infusion-based MS experiments (parallel, on-demand access to individual components) with DMS's ability to provide liquid chromatography-like separations of isobaric and isomeric compounds in a fraction of the time. In this study, we have applied a DMS-MS workflow to the rapid gas-phase separation of naphthenic acids (NAs) within a technical standard and a real-world oil sands process-affected water (OSPW) extract. Among the findings provided by this workflow are the rapid characterization of isomeric NAs (i.e., same molecular formulas) in a complex OSPW sample, the ability to use DMS to isolate individual NA components (including isomeric NAs) for in-depth structural analyses, and a method by which NA analytes, background ions, and dimer species can be characterized by their distinct behaviors in DMS. Overall, the profiles of the NA content of the technical and OSPW samples were consistent with published values for similar samples, such that the benefits of DMS technology do not detract from the workflow's accuracy or quality. PMID:25032949

Noestheden, Matthew R; Headley, John V; Peru, Kerry M; Barrow, Mark P; Burton, Lyle L; Sakuma, Takeo; Winkler, Paul; Campbell, J Larry

2014-09-01

35

Carrier mobility enhancement in poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) having undergone rapid thermal annealing  

E-print Network

poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS) is subjected to non-adiabatic rapid on an ITO/PEDOT:PSS/Al diode structure display a current-voltage relationship that correlates to space in the charge mobility of carriers in the PEDOT:PSS film. In comparison to an untreated PEDOT:PSS film

36

Location-aware mobile transportation information service  

Microsoft Academic Search

With the rapid development of mobile communications in recent years, mobile devices have ways to access Internet and contact a map service center. The most significant of mobile location based service (LBS) is that its services may vary dependent on different situation, demand, and location of individual users. That is to provide appropriate information and service based on the understanding

Shwu-Jing Chang; Gong-Ying Hsu; Shian-Jia Huang

2005-01-01

37

A Rapid Handoff Protocol for Mobility in Bluetooth Public Access Networks  

Microsoft Academic Search

The availability of low power short range wireless technologies, such as Bluetooth, is enabling compact handheld devices to be connected to information networks for mobile and ubiquitous computing. The usage model assumed is that mobile devices connect to nearby access points which in turn are connected to an external network. This model provides an alternative to the expensive 3G mobile

Aman Kansal; Uday B Desai

38

Understanding gas phase modifier interactions in rapid analysis by differential mobility-tandem mass spectrometry.  

PubMed

A systematic study involving the use and optimization of gas-phase modifiers in quantitative differential mobility-mass spectrometry (DMS-MS) analysis is presented using nucleoside-adduct biomarkers of DNA damage as an important reference point for analysis in complex matrices. Commonly used polar protic and polar aprotic modifiers have been screened for use against two deoxyguanosine adducts of DNA: N-(deoxyguanosin-8-yl)-4-aminobiphenyl (dG-C8-4-ABP) and N-(deoxyguanosin-8-y1)-2-amino-l-methyl-6-phenylimidazo[4,5-b]pyridine (dG-C8-PhIP). Particular attention was paid to compensation voltage (CoV) shifts, peak shapes, and product ion signal intensities while optimizing the DMS-MS conditions. The optimized parameters were then applied to rapid quantitation of the DNA adducts in calf thymus DNA. After a protein precipitation step, adduct levels corresponding to less than one modification in 10(6) normal DNA bases were detected using the DMS-MS platform. Based on DMS fundamentals and ab initio thermochemical results, we interpret the complexity of DMS modifier responses in terms of thermal activation and the development of solvent shells. At very high bulk gas temperature, modifier dipole moment may be the most important factor in cluster formation and cluster geometry, but at lower temperatures, multi-neutral clusters are important and less predictable. This work provides a useful protocol for targeted DNA adduct quantitation and a basis for future work on DMS modifier effects. PMID:24452298

Kafle, Amol; Coy, Stephen L; Wong, Bryan M; Fornace, Albert J; Glick, James J; Vouros, Paul

2014-07-01

39

Understanding Gas Phase Modifier Interactions in Rapid Analysis by Differential Mobility-Tandem Mass Spectrometry  

NASA Astrophysics Data System (ADS)

A systematic study involving the use and optimization of gas-phase modifiers in quantitative differential mobility-mass spectrometry (DMS-MS) analysis is presented using nucleoside-adduct biomarkers of DNA damage as an important reference point for analysis in complex matrices. Commonly used polar protic and polar aprotic modifiers have been screened for use against two deoxyguanosine adducts of DNA: N-(deoxyguanosin-8-yl)-4-aminobiphenyl (dG-C8-4-ABP) and N-(deoxyguanosin-8-y1)-2-amino-l-methyl-6-phenylimidazo[4,5-b]pyridine (dG-C8-PhIP). Particular attention was paid to compensation voltage (CoV) shifts, peak shapes, and product ion signal intensities while optimizing the DMS-MS conditions. The optimized parameters were then applied to rapid quantitation of the DNA adducts in calf thymus DNA. After a protein precipitation step, adduct levels corresponding to less than one modification in 106 normal DNA bases were detected using the DMS-MS platform. Based on DMS fundamentals and ab initio thermochemical results, we interpret the complexity of DMS modifier responses in terms of thermal activation and the development of solvent shells. At very high bulk gas temperature, modifier dipole moment may be the most important factor in cluster formation and cluster geometry, but at lower temperatures, multi-neutral clusters are important and less predictable. This work provides a useful protocol for targeted DNA adduct quantitation and a basis for future work on DMS modifier effects.

Kafle, Amol; Coy, Stephen L.; Wong, Bryan M.; Fornace, Albert J.; Glick, James J.; Vouros, Paul

2014-07-01

40

Rapid prototyping of mobile context-aware applications: the Cyberguide case study  

Microsoft Academic Search

We present the Cyberguide project, in which we arebuilding prototypes of a mobile context-aware tour guidethat provide information to a tourist based on knowledgeof position and orientation. We describe featuresof existing Cyberguide prototypes and discuss researchissues that have emerged in our context-aware applicationsdevelopment in a mobile environment.Keywords: Mobile computing applications, contextawareness,location-dependent applications, hand-helddevices1 IntroductionThe...

Sue Long; Rob Kooper; Christopher G. Atkeson

1996-01-01

41

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

Microsoft Academic Search

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

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

2010-01-01

42

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

PubMed Central

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

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

2015-01-01

43

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

PubMed Central

Fast-growing forests such as tropical secondary forests can accumulate large amounts of carbon (C), and thereby play an important role in the atmospheric CO2 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, ?13C 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

Russell, Ann E.; Raich, James W.

2012-01-01

44

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

PubMed

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

Russell, Ann E; Raich, James W

2012-06-26

45

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

PubMed Central

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

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

2013-01-01

46

The copper-mobilizing-potential of dissolved organic matter in soils varies 10-fold depending on soil incubation and extraction procedures.  

PubMed

Copper is mobilized in soil by dissolved organic matter (DOM) but the role of DOM quality in this process is unclear. A one-step resin-exchange method was developed to measure the Cu-Mobilizing-Potential (CuMP) of DOM at pCu 11.3 and pH 7.0, representing background values. The CuMP of DOM was measured in soil solutions of 13 uncontaminated soils with different DOM extraction methods. The CuMP, expressed per unit dissolved organic carbon (DOC), varied 10-fold and followed the order water extracts > 0.01 M CaCl2 extracts > pore water. Soil solutions, obtained from soils that were stored air-dry for a long time or were subjected to drying-wetting cycles, had elevated DOC concentration, but the DOM had a low CuMP. Prolonged soil incubations decreased the DOC concentration and increased the CuMP, suggesting that most of the initially elevated DOM is less humified and has lower Cu affinity than DOM remaining after incubation. A significant positive correlation between the specific UV-absorption of DOM (indicating aromaticity) and CuMP was found for all DOM samples (R(2) = 0.58). It is concluded that the DOC concentration in soil is an insufficient predictor for the Cu mobilization and that DOM samples isolated from air-dried soils are distinct from those of soils kept moist. PMID:17438775

Amery, Fien; Degryse, Fien; Degeling, Wim; Smolders, Erik; Merckx, Roel

2007-04-01

47

Rapid prototyping of an adaptive light-source for mobile manipulators with EasyKit and EasyLab  

NASA Astrophysics Data System (ADS)

While still not common in day-to-day business, mobile robot platforms form a growing market in robotics. Mobile platforms equipped with a manipulator for increased flexibility have been used successfully in biotech laboratories for sample management as shown on the well-known ESACT meetings. Navigation and object recognition is carried out by the utilization of a mounted machine vision camera. To cope with the different illumination conditions in a large laboratory, development of an adaptive light source was indispensable. We present our approach of rapid developing a computer controlled, adaptive LED light within one single business day, by utilizing the hardware toolbox EasyKit and our appropriate software counterpart EasyLab.

Wojtczyk, Martin; Barner, Simon; Geisinger, Michael; Knoll, Alois

2008-08-01

48

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

PubMed

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

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

2015-03-01

49

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

PubMed

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

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

2010-09-01

50

Neural-adaptive control of single-master-multiple-slaves teleoperation for coordinated multiple mobile manipulators with time-varying communication delays and input uncertainties.  

PubMed

In this paper, adaptive neural network control is investigated for single-master-multiple-slaves teleoperation in consideration of time delays and input dead-zone uncertainties for multiple mobile manipulators carrying a common object in a cooperative manner. Firstly, concise dynamics of teleoperation systems consisting of a single master robot, multiple coordinated slave robots, and the object are developed in the task space. To handle asymmetric time-varying delays in communication channels and unknown asymmetric input dead zones, the nonlinear dynamics of the teleoperation system are transformed into two subsystems through feedback linearization: local master or slave dynamics including the unknown input dead zones and delayed dynamics for the purpose of synchronization. Then, a model reference neural network control strategy based on linear matrix inequalities (LMI) and adaptive techniques is proposed. The developed control approach ensures that the defined tracking errors converge to zero whereas the coordination internal force errors remain bounded and can be made arbitrarily small. Throughout this paper, stability analysis is performed via explicit Lyapunov techniques under specific LMI conditions. The proposed adaptive neural network control scheme is robust against motion disturbances, parametric uncertainties, time-varying delays, and input dead zones, which is validated by simulation studies. PMID:24808577

Li, Zhijun; Su, Chun-Yi

2013-09-01

51

Rapid, in situ detection of cocaine residues based on paper spray ionization coupled with ion mobility spectrometry.  

PubMed

In this paper, a novel approach based on paper spray ionization coupled with ion mobility spectrometry (PSI-IMS) was developed for rapid, in situ detection of cocaine residues in liquid samples and on various surfaces (e.g. glass, marble, skin, wood, fingernails), without tedious sample pretreatment. The obvious advantages of PSI are its low cost, easy operation and simple configuration without using nebulizing gas or discharge gas. Compared with mass spectrometry, ion mobility spectrometry (IMS) takes advantage of its low cost, easy operation, and simple configuration without requiring a vacuum system. Therefore, IMS is a more congruous detection method for PSI in the case of rapid, in situ analysis. For the analysis of cocaine residues in liquid samples, dynamic responses from 5 ?g mL(-1) to 200 ?g mL(-1) with a linear coefficient (R(2)) of 0.992 were obtained. In this case, the limit of detection (LOD) was calculated to be 2 ?g mL(-1) as signal to noise (S/N) was 3 with a relative standard deviation (RSD) of 6.5% for 11 measurements (n = 11). Cocaine residues on various surfaces such as metal, glass, marble, wood, skin, and fingernails were also directly analyzed before wiping the surfaces with a piece of paper. The LOD was calculated to be as low as 5 ng (S/N = 3, RSD = 6.3%, n = 11). This demonstrates the capability of the PSI-IMS method for direct detection of cocaine residues at scenes of cocaine administration. Our results show that PSI-IMS is a simple, sensitive, rapid and economical method for in situ detection of this illicit drug, which could help governments to combat drug abuse. PMID:24563903

Li, Ming; Zhang, Jingjing; Jiang, Jie; Zhang, Jing; Gao, Jing; Qiao, Xiaolin

2014-04-01

52

Rapid water table fluctuations within the beach face: Implications for swash zone sediment mobility?  

Microsoft Academic Search

To incorporate groundwater infiltration\\/exfiltration in the description of swash zone sediment transport, it is required that the details of groundwater dynamics within the beach face be clarified. Field measurements of the vertical pore-pressure structure within the bed identify capillarity effects as the primary mechanism driving rapid and relatively large magnitude water table fluctuations within the swash zone. When the upper

Ian L. Turner; Peter Nielsen

1997-01-01

53

A Mobile Acoustic Subsurface Sensing (MASS) System for Rapid Roadway Assessment  

PubMed Central

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

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

2013-01-01

54

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

PubMed

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

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

2013-01-01

55

Rapid Analysis of Isobaric Exogenous Metabolites by Differential Mobility Spectrometry Mass Spectrometry  

SciTech Connect

The direct separation of isobaric glucuronide metabolites from propranolol dosed tissue extracts by differential mobility spectrometry mass spectrometry (DMS-MS) with the use of a polar gas-phase chemical modifier was demonstrated. The DMS gas-phase separation was able to resolve the isobaric metabolites with separation times on the order of ms instead of mins to hrs typically required when using pre-ionization chromatographic separation methods. Direct separation of isobaric metabolites from the complex tissue extract was validated using standards as well as implementing an HPLC separation prior to the DMS-MS analysis to pre-separate the species of interest. The ability to separate isobaric exogenous metabolites directly from a complex tissue extract is expected to facilitate the drug development process by increasing analytical throughput without the requirement for pre-ionization cleanup or separation strategies.

Parson, Whitney B [ORNL; Schneider, Bradley B [MDS Sciex; Kertesz, Vilmos [ORNL; Corr, Jay [AB Sciex; Covey, Thomas R. [MDS Sciex; Van Berkel, Gary J [ORNL

2011-01-01

56

Rapid separation and characterization of cocaine and cocaine cutting agents by differential mobility spectrometry-mass spectrometry.  

PubMed

Forensic drug laboratories are inundated with cases requiring time-consuming GC- or LC-based chromatographic separations of submitted samples. High-throughput analytical methods would be of great practical utility within forensic drug analysis. Recently developed ion-mobility-based separation methods combined with mass spectrometry can often be used without chromatography, suppress chemical interferents of similar mass, and operate in seconds. We have evaluated differential mobility spectrometry-mass spectrometry (DMS-MS) for performance on adulterated cocaine mixtures. The DMS interface is only a few centimeters in length, operates in seconds, and can be adapted to any MS system using atmospheric pressure ionization. Drug cutting agents, typical targets such as cocaine, and drug metabolites are rapidly separated by the DMS ion prefilter. Tests demonstrated characterization of complex mixtures, such as isolation of levamisole, an adulterant with alarming side effects, from a 13-component mixture. DMS-MS holds great potential for the analysis of drug samples submitted for forensic analysis. PMID:22235847

Hall, Adam B; Coy, Stephen L; Nazarov, Erkinjon G; Vouros, Paul

2012-05-01

57

Carrier mobility enhancement in poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) having undergone rapid thermal annealing  

NASA Astrophysics Data System (ADS)

The conjugated polymer poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS) is subjected to non-adiabatic rapid thermal processing and exhibits an increase in conductivity through the film. Electrical measurements on an ITO/PEDOT:PSS/Al diode structure display a current-voltage relationship that correlates to space charge limited conduction with the presence of an exponential trap distribution, which is commonly seen in other organic media. With careful application of this current transport theory to the obtained experimental results, the root cause of the conductivity enhancement can be attributed solely to an increase in the charge mobility of carriers in the PEDOT:PSS film. In comparison to an untreated PEDOT:PSS film, processing at 200 °C for 30 s results in a 35% increase in carrier mobility to 0.0128 cm2 V-1 s-1. Values for other material characteristics of PEDOT:PSS can also be extracted from this electrical analysis, and additionally are found to be unchanged with processing. Hole concentration, effective density of states, and total trap density are found to be 7.4 × 1014 cm-3, 1.5 × 1018 cm-3, and 3.7 × 1017 cm-3, respectively.

Rutledge, S. A.; Helmy, A. S.

2013-10-01

58

Rapid Mitochondrial Genome Evolution through Invasion of Mobile Elements in Two Closely Related Species of Arbuscular Mycorrhizal Fungi  

PubMed Central

Arbuscular mycorrhizal fungi (AMF) are common and important plant symbionts. They have coenocytic hyphae and form multinucleated spores. The nuclear genome of AMF is polymorphic and its organization is not well understood, which makes the development of reliable molecular markers challenging. In stark contrast, their mitochondrial genome (mtDNA) is homogeneous. To assess the intra- and inter-specific mitochondrial variability in closely related Glomus species, we performed 454 sequencing on total genomic DNA of Glomus sp. isolate DAOM-229456 and we compared its mtDNA with two G. irregulare isolates. We found that the mtDNA of Glomus sp. is homogeneous, identical in gene order and, with respect to the sequences of coding regions, almost identical to G. irregulare. However, certain genomic regions vary substantially, due to insertions/deletions of elements such as introns, mitochondrial plasmid-like DNA polymerase genes and mobile open reading frames. We found no evidence of mitochondrial or cytoplasmic plasmids in Glomus species, and mobile ORFs in Glomus are responsible for the formation of four gene hybrids in atp6, atp9, cox2, and nad3, which are most probably the result of horizontal gene transfer and are expressed at the mRNA level. We found evidence for substantial sequence variation in defined regions of mtDNA, even among closely related isolates with otherwise identical coding gene sequences. This variation makes it possible to design reliable intra- and inter-specific markers. PMID:23637766

Beaudet, Denis; Nadimi, Maryam; Iffis, Bachir; Hijri, Mohamed

2013-01-01

59

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

PubMed

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

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

2011-01-01

60

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

PubMed Central

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

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

61

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

PubMed Central

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

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

62

Rapid assessment of risks to a mobile marine mammal in an ecosystem-scale marine protected area.  

PubMed

Ecosystem-scale networks of marine protected areas (MPAs) are important conservation tools, but their effectiveness is difficult to quantify in a time frame appropriate to species conservation because of uncertainties in the data available. The dugong (Dugong dugon) is a mobile marine species that occurs in shallow inshore waters of an ecosystem-scale network of MPAs (the Great Barrier Reef World Heritage Area [GBRWHA]). We developed a rapid approach to assess risk to dugongs in the region and evaluate options to ameliorate that risk. We used expert opinion and a Delphi technique to identify and rank 5 human factors with the potential to adversely affect dugongs and their sea grass habitats: netting, indigenous hunting, trawling, vessel traffic, and poor-quality terrestrial runoff. We then quantified and compared the distribution of these factors with a spatially explicit model of dugong distribution. We estimated that approximately 96% of habitat of high conservation value for dugongs in the GBRWHA is at low risk from human activities. Using a sensitivity analysis, we found that to decrease risk, commercial netting or indigenous hunting had to be reduced in remote areas and the effects of vessel traffic, terrestrial runoff, and commercial netting had to be reduced in urban areas. This approach enabled us to compare and rank risks so as to identify the most severe risks and locate specific sites that require further management attention. PMID:18410398

Grech, A; Marsh, H

2008-06-01

63

Rapid screening of methamphetamines in human serum by headspace solid-phase microextraction using a dodecylsulfate-doped polypyrrole film coupled to ion mobility spectrometry  

Microsoft Academic Search

A simple, rapid and highly sensitive method for simultaneous analysis of methamphetamine (MA) and 3,4-methylenedioxy methamphetamine (MDMA) in human serum was developed using the solid-phase microextraction (SPME) combined with ion mobility spectrometry (IMS). A dodecylsulfate-doped polypyrrole (PPy-DS) was applied as a new fiber for SPME. Electrochemically polymerized PPy is formed on the surface of a platinum wire and will contain

Naader Alizadeh; Abdorreza Mohammadi; Mahmoud Tabrizchi

2008-01-01

64

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

Microsoft Academic Search

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

Daniel J. Pack; George W. P. York

2005-01-01

65

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

NASA Astrophysics Data System (ADS)

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).

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

2011-12-01

66

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

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

2014-01-01

67

A mobile systems perspective on vehicular networks  

Microsoft Academic Search

To date the vehicular networks community has primarily focused on designing vehicle-to-vehicle communication systems that can communicate reliably in environments with high mobility and rapidly varying vehicle density. As standards for vehicular communications are maturing, it is becoming increasingly important to understand how these communication systems can and should interact with other technologies in vehicular systems. Vehicles have become rich

Marco Gruteser

2012-01-01

68

Assessing contaminant mobilization from waste materials: application of Bayesian parameter estimation to batch extraction tests at varying liquid-to-solid ratios.  

PubMed

We investigated the release of chloride, sulfate, sodium, copper, chromium, and dissolved organic carbon from a demolition waste material and a municipal waste incineration product Batch leaching tests at the liquid-to-solid ratios (L/S ratios) 1, 2, 5, 10, and 50 L kg(-1) were carried out and the parameters of a mass balance-partitioning model were estimated from measured concentrations in the extracts by applying a Bayesian approach using a Markov Chain Monte Carlo sampler. We assessed the uncertainty of the model parameters, the desorption isotherms, and the model-predicted concentrations, respectively. Both the excellent fit to the experimental data and a comparison between the model-predicted and independently measured concentrations at the L/S ratios of 0.25 and 0.5 L kg(-1) showed the applicability of the model for almost all studied substances and both materials. Since experimental difficulties impede extraction tests at L/S ratios representative of field soil-water contents, the predictability of concentrations in this range is of great practical relevance for risk assessments. We conclude that batch extraction tests at varying L/S ratios provide, at moderate experimental cost, a powerful complement to established test designs like column leaching or single batch extraction tests. PMID:18546713

Iden, Sascha C; Delay, Markus; Frimmel, Fritz H; Durner, Wolfgang

2008-05-15

69

Spike structure at the interface between gliding Mycoplasma mobile cells and glass surfaces visualized by rapid-freeze-and-fracture electron microscopy.  

PubMed

Mycoplasma mobile is a flask-shaped bacteria that binds to a substrate and glides towards its tapered end, the so-called "head-like protrusion," by an unknown mechanism. To search for cellular structures underlying this motility, the cell-substrate interface of actively gliding cells was visualized by rapid-freeze-and-freeze-fracture rotary-shadow electron microscopy. Novel structures, called "spikes," were observed to protrude from the cell membrane and attach to the glass surface at their distal end. The spikes were on average 50 nm in length and 4 nm in diameter, most abundant around the head, and not observed in a nonbinding mutant. The spikes may be involved in the mechanism of binding, gliding, or both. PMID:15205441

Miyata, Makoto; Petersen, Jennifer D

2004-07-01

70

Spike Structure at the Interface between Gliding Mycoplasma mobile Cells and Glass Surfaces Visualized by Rapid-Freeze-and-Fracture Electron Microscopy  

PubMed Central

Mycoplasma mobile is a flask-shaped bacteria that binds to a substrate and glides towards its tapered end, the so-called “head-like protrusion,” by an unknown mechanism. To search for cellular structures underlying this motility, the cell-substrate interface of actively gliding cells was visualized by rapid-freeze-and-freeze-fracture rotary-shadow electron microscopy. Novel structures, called “spikes,” were observed to protrude from the cell membrane and attach to the glass surface at their distal end. The spikes were on average 50 nm in length and 4 nm in diameter, most abundant around the head, and not observed in a nonbinding mutant. The spikes may be involved in the mechanism of binding, gliding, or both. PMID:15205441

Miyata, Makoto; Petersen, Jennifer D.

2004-01-01

71

Direct Infusion Electrospray Ionization - Ion Mobility - High Resolution Mass Spectrometry (DIESI-IM-HRMS) for Rapid Characterization of Potential Bioprocess Streams  

NASA Astrophysics Data System (ADS)

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.

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

2012-07-01

72

Mobile Environmental Applications  

Microsoft Academic Search

Mobile communication has developed rapidly in the last few years, shifting from voice to data transfer and offering unique opportunities for providing information. This study focuses on one such aspect, mobile information for environmental purposes. Firstly, the introduction reviews using new media for environmental information. Then an explanation of the mobile medium with its unique characteristics and examples of mobile

Astrid Dickinger; Peter Heinzmann; Jamie Murphy

2005-01-01

73

Specification of Mobile Transparency  

Microsoft Academic Search

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

Andry Rakotonirainy; Andy Bond

74

Make a Mobile!  

NSDL National Science Digital Library

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.

Chicago Children's Museum

2010-01-01

75

Behaviour of mobile macrofauna is a key factor in beach ecology as response to rapid environmental changes  

NASA Astrophysics Data System (ADS)

Sandy beach animals show behavioural adaptations that are expressed as contingencies during the life history of individuals to face periodic and episodic environmental changes. Such adaptations include activity rhythms, orientation, zonation, burrowing, escape responses and feeding strategies, the first two being common adaptations to all mobile animals. The complex conditions of a particular beach environment may be integrated in a learning process enhancing the adaptation and survival of individuals and eventually of populations. Evidence exists of genetic determination of some behavioural features that are adaptive in the long term (throughout generations) by increasing individual survival and reproductive potential. The environmental features integrated with the life history of beach animals shape the individual behaviour through ontogenetic processes, as well as population behaviour through evolutionary processes. Thus, behavioural differences among individuals may reflect environmental variation at the local and small/medium temporal scales of beach processes, whereas within-population behavioural coherence and differences among populations may reflect variation at the geographic scale. The different foci stressed by different authors and the variety of evidence dependent upon local geographical and ecological conditions have often resulted in compartmentalised explanations, making generalizations and the repeatability of behavioural studies of beach ecology challenging. There was a need to developing a more synthetic paradigm for beach animal behaviour. This paper gives a brief overview of the theoretical background and keystone studies, which have contributed to our understanding of animal behaviour in sandy beach ecology, and proposes testable hypotheses to be integrated in the beach ecology paradigm.

Scapini, Felicita

2014-10-01

76

Time varying networks and the weakness of strong ties  

NASA Astrophysics Data System (ADS)

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.

Karsai, Márton; Perra, Nicola; Vespignani, Alessandro

2014-02-01

77

Coupling age-structured stock assessment and fish bioenergetics models: a system of time-varying models for quantifying piscivory patterns during the rapid trophic shift in the main basin of Lake Huron  

USGS Publications Warehouse

We quantified piscivory patterns in the main basin of Lake Huron during 1984–2010 and found that the biomass transfer from prey fish to piscivores remained consistently high despite the rapid major trophic shift in the food webs. We coupled age-structured stock assessment models and fish bioenergetics models for lake trout (Salvelinus namaycush), Chinook salmon (Oncorhynchus tshawytscha), walleye (Sander vitreus), and lake whitefish (Coregonus clupeaformis). The model system also included time-varying parameters or variables of growth, length–mass relations, maturity schedules, energy density, and diets. These time-varying models reflected the dynamic connections that a fish cohort responded to year-to-year ecosystem changes at different ages and body sizes. We found that the ratio of annual predation by lake trout, Chinook salmon, and walleye combined with the biomass indices of age-1 and older alewives (Alosa pseudoharengus) and rainbow smelt (Osmerus mordax) increased more than tenfold during 1987–2010, and such increases in predation pressure were structured by relatively stable biomass of the three piscivores and stepwise declines in the biomass of alewives and rainbow smelt. The piscivore stability was supported by the use of alternative energy pathways and changes in relative composition of the three piscivores. In addition, lake whitefish became a new piscivore by feeding on round goby (Neogobius melanostomus). Their total fish consumption rivaled that of the other piscivores combined, although fish were still a modest proportion of their diet. Overall, the use of alternative energy pathways by piscivores allowed the increases in predation pressure on dominant diet species.

He, Ji X.; Bence, James R.; Madenjian, Charles P.; Pothoven, Steven A.; Dobiesz, Norine E.; Fielder, David G.; Johnson, James E.; Ebener, Mark P.; Cottrill, Adam R.; Mohr, Lloyd C.; Koproski, Scott R.

2015-01-01

78

Rapid Accumulation of Phosphatidylinositol 4,5-Bisphosphate and Inositol 1,4,5-Trisphosphate Correlates with Calcium Mobilization in Salt-Stressed Arabidopsis1  

PubMed Central

The phosphoinositide phosphatidylinositol 4,5-bisphosphate [PtdIns(4,5)P2] is a key signaling molecule in animal cells. It can be hydrolyzed to release 1,2-diacyglycerol and inositol 1,4,5-trisphosphate (IP3), which in animal cells lead to protein kinase C activation and cellular calcium mobilization, respectively. In addition to its critical roles in constitutive and regulated secretion of proteins, PtdIns(4,5)P2 binds to proteins that modify cytoskeletal architecture and phospholipid constituents. Herein, we report that Arabidopsis plants grown in liquid media rapidly increase PtdIns(4,5)P2 synthesis in response to treatment with sodium chloride, potassium chloride, and sorbitol. These results demonstrate that when challenged with salinity and osmotic stress, terrestrial plants respond differently than algae, yeasts, and animal cells that accumulate different species of phosphoinositides. We also show data demonstrating that whole-plant IP3 levels increase significantly within 1 min of stress initiation, and that IP3 levels continue to increase for more than 30 min during stress application. Furthermore, using the calcium indicators Fura-2 and Fluo-3 we show that root intracellular calcium concentrations increase in response to stress treatments. Taken together, these results suggest that in response to salt and osmotic stress, Arabidopsis uses a signaling pathway in which a small but significant portion of PtdIns(4,5)P2 is hydrolyzed to IP3. The accumulation of IP3 occurs during a time frame similar to that observed for stress-induced calcium mobilization. These data also suggest that the majority of the PtdIns(4,5)P2 synthesized in response to salt and osmotic stress may be utilized for cellular signaling events distinct from the canonical IP3 signaling pathway. PMID:11402204

DeWald, Daryll B.; Torabinejad, Javad; Jones, Christopher A.; Shope, Joseph C.; Cangelosi, Amanda R.; Thompson, James E.; Prestwich, Glenn D.; Hama, Hiroko

2001-01-01

79

Basis expansion models and diversity techniques for blind identification and equalization of time-varying channels  

Microsoft Academic Search

The time-varying impulse response of rapidly fading mobile communication channels is expanded over a basis of complex exponentials that arise due to Doppler effects encountered with multipath propagation. Blind methods are reviewed for estimating the bases' parameters and the model orders. Existing second-order methods are critiqued and novel algorithms are developed for blind identification, direct, zero-forcing equalization and minimum mean

GEORGIOS B. GIANNAKIS; C. Tepedelenlioglu

1998-01-01

80

Rapid analysis of tile industry gaseous emissions by ion mobility spectrometry and comparison with solid phase micro-extraction/gas chromatography/mass spectrometry.  

PubMed

The present paper reports on a rapid method for the analysis of gaseous emissions from ceramic industry, based on ion mobility spectrometry (IMS) as a means for on-site monitoring of volatile organic compounds (VOCs) produced during tile baking. IMS was calibrated with a set of reference compounds (i.e. ethyl acetate, ethanol, ethylene glycol, diethylene glycol, acetaldehyde, formaldehyde, 2-methyl-1,3-dioxolane, 2,2-dimethyl-1,3-dioxolane, 1,3-dioxolane, 1,4-dioxane, benzene, toluene, cyclohexane, acetone, acetic acid) via air-flow permeation. The technique was tested on a laboratory-scale kiln and tiles prepared with selected glycol- and resin-based additives. Finally, the analytical method was applied to emissions from two industries in the Modena (Italy) ceramic area. The results of all experimental phases were compared to those obtained by solid phase micro-extraction/gas chromatography/mass spectrometry (SPME/GC/MS). IMS showed potential as a real-time monitoring device for quality assessment in ceramic industry emissions. IMS spectra, SPME/GC/MS data, relationship between additives/baking conditions and produced VOCs and advantages and limitations of both techniques will be discussed. PMID:17133278

Pozzi, R; Bocchini, P; Pinelli, F; Galletti, G C

2006-12-01

81

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

Microsoft Academic Search

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

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

2002-01-01

82

Time Varying Feature Data  

NASA Astrophysics Data System (ADS)

The infrastructure to gather, store and access information about our environment is improving and growing rapidly. The increasing amount of information allows us to get a better understanding of the current state of our environment, historical processes and to simulate and predict the future state of the environment. Finer grained spatial and temporal data and more reliable communications make it easier to model dynamic states and ephemeral features. The exchange of information within and across geospatial domains is facilitated through the use of harmonized information models. The Observations & Measurements (O&M) developed through OGC and standardised by ISO is an example of such a cross-domain information model. It is used in many domains, including meteorology, hydrology as well as the emergency management. O&M enables harmonized representation of common metadata that belong to the act of determining the state of a feature property, whether by sensors, simulations or humans. In addition to the resulting feature property value, information such as the result quality but especially the time that the result applies to the feature property can be represented. Temporal metadata is critical to modelling past and future states of a feature. The features, and the semantics of each property, are defined in domain specific Application Schema using the General Feature Model (GFM) from ISO 19109 and usually encoded following ISO 19136. However, at the moment these standards provide only limited support for the representation and handling of time varying feature data. Features like rivers, wildfires or gas plumes have a defined state - for example geographic extent - at any given point in time. To keep track of changes, a more complex model for example using time-series coverages is required. Furthermore, the representation and management of feature property value changes via the service interfaces defined by OGC and ISO - namely: WFS and WCS - would be rather complex. Keeping track of feature property value corrections or even feature (state change) cancellations for auditing purposes is also not easy to achieve. The aviation domain has strong requirements to represent and manage the state of aeronautical features through time. Being able to efficiently encode and manage feature state changes, keeping track of all changes for auditing purposes and being able to determine the future state of an aeronautical feature as currently known to the system are vital for aeronautical applications. In order to support these requirements, the Aeronautical Information Exchange Model (AIXM) which has been developed by the aviation domain is based on the so called AIXM Temporality Model (AIXM-TM). The AIXM-TM defines various rules for modeling, representing and handling the state of aeronautical features through time. This is a promising approach that can be incorporated into the GFM so that ultimately the modeling and management of time varying feature data is supported in an interoperable and harmonized way in all geospatial domains. This presentation gives an introduction to the main concepts of the AIXM-TM. It also shows how the GFM can be extended to support time varying feature data. Finally, the relationship of O&M and time varying features is discussed.

Echterhoff, J.; Simonis, I.; Atkinson, R.

2012-04-01

83

Mobile Applications for Extension  

ERIC Educational Resources Information Center

Mobile computing devices (smart phones, tablets, etc.) are rapidly becoming the dominant means of communication worldwide and are increasingly being used for scientific investigation. This technology can further our Extension mission by increasing our power for data collection, information dissemination, and informed decision-making. Mobile

Drill, Sabrina L.

2012-01-01

84

The rapidly deployable radio network  

Microsoft Academic Search

The rapidly deployable radio network (RDRN) is an architecture and experimental system to develop and evaluate hardware and software components suitable for implementing mobile, rapidly deployable, and adaptive wireless communications systems. The driving application for the RDRN is the need to quickly establish a communications infrastructure following a natural disaster, during a law enforcement activity, or rapid deployment of military

Joseph B. Evans; Gary J. Minden; K. S. Shanmugan; Glen Prescott; Victor S. Frost; Ben Ewy; Ricardo Sanchez; Craig Sparks; K. Malinimohan; James Roberts; Richard Plumb; Dave Petr

1999-01-01

85

Mobile web applications: bringing mobile apps and web together  

Microsoft Academic Search

The popularity of mobile applications is very high and still growing rapidly. These applications allow their users to stay connected with a large number of service providers in seamless fashion, both for leisure and productivity. But service prThe popularity of mobile applications is very high and still growing rapidly. These applications allow their users to stay connected with a large

Marie-Claire Forgue; Dominique Hazaël-Massieux

2012-01-01

86

Mobile Ambients  

Microsoft Academic Search

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

Luca Cardelli; Andrew D. Gordon

1998-01-01

87

Electromembrane-surrounded solid-phase microextraction coupled to ion mobility spectrometry for the determination of nonsteroidal anti-inflammatory drugs: A rapid screening method in complicated matrices.  

PubMed

A new robust method of electromembrane-surrounded solid-phase microextraction coupled to ion mobility mass spectrometry was applied for nonsteroidal anti-inflammatory drugs determination in complex matrices. This is the first time that a graphene/polyaniline composite coating is applied in electromembrane-surrounded solid-phase microextraction method. The homemade graphene/polyaniline composite is characterized by a high electrical conductivity and thermal stability. The variables affecting electromembrane-surrounded solid-phase microextraction, including extraction time; applied voltage and pH were optimized through chemometric methods, central composite design, and response surface methodology. Under the optimized conditions, limits of detection of 0.04 and 0.05 ng/mL were obtained for mefenamic acid and ibuprofen, respectively. The feasibility of electromembrane-surrounded solid-phase microextraction followed by ion mobility mass spectrometry was successfully confirmed by the extraction and determination of low levels of ibuprofen and mefenamic acid in human urine and plasma samples and satisfactory results were obtained. PMID:25655267

Abedi, Hamid; Ebrahimzadeh, Homeira

2015-05-01

88

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

PubMed Central

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

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

2014-01-01

89

Research article Rapid fabrication of a  

E-print Network

of fully functional and mobile robotic systems, and offers an alternative manufacturing process. OverResearch article Rapid fabrication of a non-assembly robotic hand with embedded components Kathryn University, Boston, Massachusetts, USA. Keywords Rapid prototypes, Robotics, Assembly Abstract

Mavroidis, Constantinos

90

Mole – Concepts of a mobile agent system  

Microsoft Academic Search

Due to its salient properties, mobile agent technology has received a rapidly growing attention over the last few years. Many developments of mobile agent systems are under way in both academic and industrial environments. In addition, there are already various efforts to standardize mobile agent facilities and architectures. Mole is the first mobile agent system that has been developed in

J. Baumann; F. Hohl; K. Rothermel; M. Straßer

1998-01-01

91

1. Final Title SECURITY of MOBILE COMMUNICATIONS  

E-print Network

1. Final Title SECURITY of MOBILE COMMUNICATIONS By Noureddine Boudriga Professor at the University of Carthage, Tunisia 2. Summary Mobile communications offer wireless connectivity that enables mobility the growing development of mobile communications more rapidly than ever before. Consequently, a large set

92

Buffer mobility and the regulation of neuronal calcium domains  

PubMed Central

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

Matthews, Elizabeth A.; Dietrich, Dirk

2015-01-01

93

Pseudodifferential operators and Banach algebras in mobile communications  

E-print Network

Pseudodifferential operators and Banach algebras in mobile communications Thomas Strohmer to construct numerically efficient equalizers for multicarrier communication systems in a mobile envi- ronment. 1 Introduction Mobile wireless communication is an extremely rapidly growing sector

Strohmer, Thomas

94

Varying constants quantum cosmology  

E-print Network

We discuss minisuperspace models within the framework of varying physical constants theories including $\\Lambda$-term. In particular, we consider the varying speed of light (VSL) theory and varying gravitational constant theory (VG) using the specific ans\\"atze for the variability of constants: $c(a) = c_0 a^n$ and $G(a)=G_0 a^q$. We find that most of the varying $c$ and $G$ minisuperspace potentials are of the tunneling type which allows to use WKB approximation of quantum mechanics. Using this method we show that the probability of tunneling of the universe "from nothing" ($a=0)$ to a Friedmann geometry with the scale factor $a_t$ is large for growing $c$ models and is strongly suppressed for diminishing $c$ models. As for $G$ varying, the probability of tunneling is large for $G$ diminishing, while it is small for $G$ increasing. In general, both varying $c$ and $G$ change the probability of tunneling in comparison to the standard matter content (cosmological term, dust, radiation) universe models.

Katarzyna Leszczynska; Adam Balcerzak; Mariusz P. Dabrowski

2015-01-26

95

Understanding the behavior of mobile data services consumers  

Microsoft Academic Search

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

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

2008-01-01

96

On effective offloading services for resource-constrained mobile devices running heavier mobile Internet applications  

Microsoft Academic Search

Rapid advances in wireless mobile network technologies and mobile handsets (MHs) facilitate ubiquitous infrastructure that can support a range of mobile services and applications in addition to conventional mobile Internet access. One recent trend is to effectively run desktop PC-oriented heavier applications on MHs. However, due to their miniature, portable size, MHs are resource-constrained and therefore, running these applications directly

Kun Yang; Shumao Ou; Hsiao-Hwa Chen

2008-01-01

97

Use your mobile computing devices to learn - Contextual mobile learning system design and case studies  

Microsoft Academic Search

In recent years, with the rapid development of mobile computing technologies, a new learning style-mobile learning has exploded everywhere in our society, which is considered as an essential learning style in the future. This paper presents a mobile learning system taking into account learning context, which is also called contextual mobile learning. With the help of this system, we can

Chuantao Yin; Bertrand DAVID; René CHALON

2009-01-01

98

Fast Varying Loads  

Microsoft Academic Search

The operation of Fast Varying Loads (FVLs) in distribution systems is associated with high variation in the active power and bursts of distortion. FVLs affect surrounding loads sensitive to voltage rms variation and distortion. Thus they affect quality of the supply. This paper presents an overview of some electric loads that behave as FVLs. FVLs are characterized in this paper

Veronica B. Bohorquez

2007-01-01

99

A QoS-aware system for mobile cloud computing  

Microsoft Academic Search

With the rapid growth of mobile smart phone users, more and more mobile users are using mobile phones to access Internet services. Meanwhile, cloud computing is changing the landscape of Internet services, so as to affect the mobile services. Cloud computing is regarded as the future of mobile. However, cloud computing still faces a number of challenges, one of which

Peng Zhang; Zheng Yan

2011-01-01

100

RAPID Contacts  

Cancer.gov

Rapid Access to Preventive Intervention Development (RAPID) Program Contacts Program Contact RAPID ProgramAttn: Izet M. Kapetanovic, PhD, Program Director Chemopreventive Agent Development Research Group Division of Cancer Prevention, NCI Executive Plaza

101

Mobile Computing/Mobile Computing/Mobile Computing/Mobile Computing/ Mobile NetworksMobile NetworksMobile NetworksMobile Networks  

E-print Network

Mobile Computing/Mobile Computing/Mobile Computing/Mobile Computing/ Mobile NetworksMobile NetworksMobile NetworksMobile Networks Mobile IP Prof. Chansu Yu Quiz What is the role of IP? Does the router have two IP for Wired Network Mobile IP Overview Basic Mobile IP Agent Discovery Registration Tunneling Route

Yu, Chansu

102

The Future of Mobile Technology and Mobile Wireless Computing  

ERIC Educational Resources Information Center

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…

Hart, Jim; Hannan, Mike

2004-01-01

103

Multimedia Software for Mobile Phones  

Microsoft Academic Search

The amount of software in mobile phones has increased dramatically over recent years-up to 20 million LOC in some cases-resulting in a magnitude of new features from apps to multimedia. To keep up with the rapidly expanding market, software developers for mobile phones must be innovative and astute.

Lionel Bouchard

2010-01-01

104

Central role of electronic temperature for photoelectron charge and spin mobilities in p+-GaAs  

NASA Astrophysics Data System (ADS)

The charge and spin mobilities of minority photoelectrons in p+-GaAs are determined by monitoring the effect of an electric field on the spatial profiles of the luminescence and of its polarization. By using electric fields to increase the photoelectron temperature Te without significantly changing the hole or lattice temperatures, the charge and spin mobilities are shown to be principally dependent on Te. For Te > 70 K, both the charge and spin mobilities vary as Te-1.3 , while at lower temperatures this changes to an even more rapid Te-4.3 law. This finding suggests that current theoretical models based on degeneracy of majority carriers cannot fully explain the observed temperature dependence of minority carrier mobility.

Cadiz, F.; Paget, D.; Rowe, A. C. H.; Peytavit, E.; Arscott, S.

2015-03-01

105

Mobile Multicast in Hierarchical Proxy Mobile IPV6  

NASA Astrophysics Data System (ADS)

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.

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

2013-12-01

106

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

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

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

2014-01-01

107

Mobile user experience research: challenges, methods & tools  

Microsoft Academic Search

We are currently witnessing rapid innovation in mobile user experience (UX) research. The HCI community is creating and adapting research methods, tools, and infrastructure for mobile-specific challenges and opportunities. This workshop brings together researchers from industry and academia, designers, and creators of research tools, who faced the challenges of mobile UX research and responded with innovative approaches. We will examine

Yelena Nakhimovsky; Dean Eckles; Jens Riegelsberger

2009-01-01

108

Introduction: The Prospects for Mobile Learning  

ERIC Educational Resources Information Center

The issue that this article introduces grew out of an event, the UNESCO Mobile Learning Week, but also out of a wider and growing movement of people and organisations exploiting mobile technologies, as they pursue varied educational missions. The UNESCO Mobile Learning Week represented by contributions here was a focus for contributions from…

Traxler, John; Vosloo, Steve

2014-01-01

109

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

E-print Network

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.

Paul, Bijan; Bikas, Md Abu Naser

2012-01-01

110

About RAPID  

Cancer.gov

The Rapid Access to Preventive Intervention Development (RAPID) Program makes the contract resources from NCI's Division of Cancer Prevention available to academic and academically-affiliated investigators for preclinical and early clinical drug development.

111

Blade pitch varying mechanism  

SciTech Connect

A gas turbine engine is described comprising: (a) a stationary member; (b) first and second rotating structures coaxially disposed about the stationary member; (c) an annular gas flowpath coaxial with the first and second rotating structures; (d) first and second rotor blades attached to the first and second rotating structures; (e) forward and aft rows of variable pitch propulsor blades coupled to and disposed radially outwardly of the first and second rotating structures respectively; (f) a first gear coaxially coupled to one of the propulsor blades whereby angular displacement of the first gear about a radius of the rotating structure varies the pitch of the propulsor blade with respect to the rotating structure; (g) a second gear rotatably coupled to the first gear; (h) a third gear rigidly coupled to the second gear; (i) a fourth gear rigidly coupled to the rotating structure and rotatably coupled to the thrid gear, (j) means for eccentrically revolving the second gear and the third gear with respect to the first gear and the fourth gear, respectively, whereby the first gear is angularly displaced with respect to the fourth gear.

Butler, L.

1988-04-19

112

Mobile resonance enhanced multiphoton ionisation-time-of-flight mass spectrometer with a novel hybrid laser desorption/molecular beam ion source for rapid detection of aromatic trace compounds from gas phase and solid samples.  

PubMed

A mobile, field applicable resonance enhanced multiphoton ionisation-time-of-flight mass spectrometer (REMPI-TOFMS) for direct-inlet gas-phase analysis as well as for characterisation of solid samples, has been developed. For solid-sample analysis, laser desorption (LD) with IR-laser pulses is used for volatilisation of the neutral analytes from a target in the ion source prior to REMPI-TOFMS analysis. For direct inlet gas-phase analysis, a needle gas inlet is used and the formed molecular beam is REMPI-ionised directly in the ion source. A special ion source was developed, which can be rapidly interchanged between the REMPI-TOFMS and the LD-REMPI-TOFMS modes. The system is equipped with a tuneable optical parametrical oscillator (OPO)-laser system. The analytical properties are characterised for both modes of operations. In both cases, analytical performance is similar to that achieved with instruments specifically designed for either gas-phase or solid-phase characterisation. Results from field measurements of a wood combustion flue gas of a 174 kW bio mass furnace are given. Gas-phase analysis was applied for time-resolved on-line REMPI-TOFMS of the semi-volatile aromatic flue gas constituents. The low-volatile aromatic compounds, which were precipitated with the particulate matter in the filtering unit of the sampling train, were characterised by direct LD-REMPI-TOFMS of the glass fibre filter material. By combining the gas-phase and particulate results a rather comprehensive characterisation of the aromatic species present in the flue gas (i.e. aerosol--gas phase plus particulate matter) was achieved. PMID:15595650

Hauler, T E; Boesl, U; Kaesdorf, S; Zimmermann, R

2004-11-26

113

A large scale study of European mobile search behaviour  

Microsoft Academic Search

Recent evidence suggests that mobile search is becoming an in- creasingly important way for mobile users to gain access to on- line information, especially as off-portal content continues to grow rapidly. In this paper we study the characteristics of mobile search by analysing approximately 6 million individual search requests generated by over 260,000 individual mobile searchers over a 7- day

Karen Church; Barry Smyth; Keith Bradley; Paul Cotter

2008-01-01

114

Research on Mobile GIS: Characteristics, Frame and Key Technologies  

Microsoft Academic Search

With the rapid development of internet and communication technologies, mobile computing has become a main computational method nowadays, and geographic information system based on mobile computing is the extension of mobile computing in the spatial information field. It can be forecasted that Mobile GIS will become the next luminescent point of GIS industry. This paper set forth the concept of

Chen Guoliang; Wang Yunjia; Wang Jian

2010-01-01

115

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

ERIC Educational Resources Information Center

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…

Lum, Lydia

2012-01-01

116

Mobile Agents for Mobile Computing  

Microsoft Academic Search

Mobile agents are programs that can move through a network under their own control, migratingfrom host to host and interacting with other agents and resources on each. We argue thatthese mobile, autonomous agents have the potential to provide a convenient, efficient and robustprogramming paradigm for distributed applications, particularly when partially connected computersare involved. Partially connected computers include mobile computers such

Daniela Rus; David Kotz; George Cybenko; Robert Gray; Saurab Nog

1996-01-01

117

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

PubMed Central

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

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

2013-01-01

118

Technology, Mobility, and Poverty Reduction  

Microsoft Academic Search

\\u000a Information and Communication Technologies have had undeniable effects on global mobility. They not only facilitate the international\\u000a mobility of goods, money, and people, they also enable the rapid, often instantaneous, transmission of thoughts, ideas, and\\u000a data across the world, rendering knowledge, information, and networking opportunities essentially borderless. Depending on\\u000a how they are cultivated and used, these trends can accelerate or

Lori Foster Thompson; Stephen G. Atkins

119

Varying \\  

Microsoft Academic Search

We review astrophysical, cosmological and terrestrial evidence for and against the con- stancy of fundamental parameters of particle physics, and discuss theoretical issues of unification and scalar-mediated forces, finding that the current rate of variation is bounded by limits on viola- tions of the weak equivalence principle. Introduction. The constancy of the parameters of particle physics (1), such as the

Thomas Dent

120

Mobile Forces  

NSDL National Science Digital Library

The application of engineering principles is explored in the creation of mobiles. As students create their own mobiles, they take into consideration the forces of gravity and convection air currents. They learn how an understanding of balancing forces is important in both art and engineering design.

2014-09-18

121

Mobile computing \\  

Microsoft Academic Search

Design competitions offer students an excellent way to gain hands-on experience in engineering and computer science courses. The University of Florida, in partnership with Motorola, has held two mobile computing design competitions. In Spring and Fall 2001, students in Abdelsalam Helal's Mobile Computing class designed killer apps for a Motorola smart phone.

S. F. Midkiff

2002-01-01

122

Mobile IP  

Microsoft Academic Search

Mobile IP has been designed within the Internet Engineering Task Force (IETF) to serve the needs of the burgeoning population of mobile computer users who wish to connect to the Internet and maintain communications as they move from place to place. The basic protocol is described, with details given on the three major component protocols: agent advertisement, registration, and tunneling.

C. E. Perkins

1997-01-01

123

EBSCOhost Mobile  

Microsoft Academic Search

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

Ron Burns; Sara Rofofsky Marcus

2010-01-01

124

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.

125

Get Your Mobile App Out the Door  

Microsoft Academic Search

\\u000a The increased speed and vast number of mobile products being released into the market has demanded that Oracle design and\\u000a develop mobile products faster. These applications must be innovative to stay competitive in the market place. We will present\\u000a a rapid design and research process that has been used to create a superior mobile expenses application. This process assisted\\u000a in

Heather Cottingham; Michele Snyder

126

A Mobile Computing Approach for Navigation Purposes  

Microsoft Academic Search

The mobile computing technology has been rapidly increased in the past decade; however there still exist some important constraints\\u000a which complicate the use of mobile information systems. The limited resources on the mobile computing would restrict some\\u000a features that are available on the traditional computing technology. In almost all previous works it is assumed that the moving\\u000a object cruises within

Mohammad Reza Malek; Andrew U. Frank

2006-01-01

127

Developing visual interfaces for mobile devices  

Microsoft Academic Search

The popularity of mobile interfaces and application development is increasing along with the rapid expansion of the mobile electronics market and its migration from text-based applications to various multimedia applications. Real-time graphics and web applications are becoming one of the most attractive applications in mobile terminals due to their benefits for enterprise, gaming, and social media. This hands-on course will

Benjamin Watson; Vidya Setlur; Kari Pulli

2011-01-01

128

Intrusion Detection Techniques for Mobile Wireless Networks  

Microsoft Academic Search

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

Wenke Lee; Yi-An Huang

2003-01-01

129

Mobile wireless computing: challenges in data management  

Microsoft Academic Search

Mobile computing is a new emerging computing paradigm posing many challenging data managementproblems. We identify these new challenges and investigate their technical significance. New researchproblems include management of location dependent data, information services to mobile users, frequentdisconnections, wireless data broadcasting, and energy efficient data access.1 IntroductionThe rapidly expanding technology of cellular communications, wireless LAN, and satellite services will...

Tomasz Imielinski; B. R. Badrinath

1994-01-01

130

Intrusion Detection Techniques for Mobile Wireless Networks  

Microsoft Academic Search

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

Yongguang Zhang; Wenke Lee; Yi-An Huang

2003-01-01

131

Map Making by Cooperating Mobile Robots  

Microsoft Academic Search

The problem of map making using cooperating multiple heterogeneous mobile robots is investigated. The mobile robots vary in size and capabilities in terms of speeds to navigate through the region and sensor ranges to acquire information about the region. The robots are assumed to have sufficient memory to store the map and to be able to communicate with each other.

Karansher Singh; Kikuo Fujimurat

1993-01-01

132

The Changing Role of Student Mobility  

ERIC Educational Resources Information Center

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…

Rivza, Baiba; Teichler, Ulrich

2007-01-01

133

Mobile Website Overview Mobile Application Development Policy  

E-print Network

of University Communication May 29, 2012 #12;Mobile Web/Mobile App Development Policy Villanova University May .......................................................................................................................... 12 #12;Mobile Web/Mobile App Development Policy Villanova University May 29, 2012 Page 3 of 13 I accesses the mobile web. Native apps, in contrast, are permanently downloaded to mobile devices and must

Jackman, Todd

134

Mobile Collector for Field Trips  

ERIC Educational Resources Information Center

Current e-Learning is based on learning management systems that provide certain standard services--course authoring and delivery, tutoring, administration and collaboration facilities. Rapid development of mobile technologies opens a new area of m-Learning to enhance the current educational opportunities. Field trips are a relevant part of the…

Kravcik, Milos; Kaibel, Andreas; Specht, Marcus; Terrenghi, Lucia

2004-01-01

135

A Mobile Personalized RFID System  

Microsoft Academic Search

RFID is a rapid-developing technology for wireless identification lately. There are many related products and systems for various applications. However, most of them only deal with logistic management or business management without involving users' concerns for personalized services. Therefore, it motivates us to develop a mobile personalized RFID system with an event processing model focusing on the characterization of identification

Ruay-shiung Chang; Jih-sheng Chang; Jiing-hsing Ruey

2009-01-01

136

Mobile cinema  

E-print Network

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 ...

Pan, Pengkai, 1972-

2004-01-01

137

Mobile phones and sleep - A review  

NASA Astrophysics Data System (ADS)

The increasing use of mobile phones has raised concerns regarding the potential health effects of exposure to the radiofrequency electromagnetic fields. An increasing amount research related to mobile phone use has focussed on the possible effects of mobile phone exposure on human brain activity and function. In particular, the use of sleep research has become a more widely used technique for assessing the possible effects of mobile phones on human health and wellbeing especially in the investigation of potential changes in sleep architecture resulting from mobile phone use. Acute exposure to a mobile phone prior to sleep significantly enhances electroencephalogram spectral power in the sleep spindle frequency range. This mobile phone-induced enhancement in spectral power is largely transitory and does not linger throughout the night. Furthermore, a reduction in rapid eye movement sleep latency following mobile phone exposure was also found, although interestingly, neither this change in rapid eye movement sleep latency or the enhancement in spectral power following mobile phone exposure, led to changes in the overall quality of sleep. In conclusion, a short exposure to the radiofrequency electromagnetic fields emitted by a mobile phone handset immediately prior to sleep is sufficient to induce changes in brain activity in the initial part of sleep. The consequences or functional significance of this effect are currently unknown and it would be premature to draw conclusions about possible health consequences.

Supe, Sanjay S.

2010-01-01

138

INTRODUCTION TO CLOUDY MOBILE APP DEVELOPMENT Ron Coleman  

E-print Network

INTRODUCTION TO CLOUDY MOBILE APP DEVELOPMENT Ron Coleman School of Computer Science, explores the history of mobile computing and clouds, and considers apps in the cloud, getting hands-on experience with rapid prototyping and development of "cloudy" mobile apps using state-of-the-art technologies

Coleman, Ron

139

Fast App Launching for Mobile Devices Using Predictive User Context  

E-print Network

Fast App Launching for Mobile Devices Using Predictive User Context Tingxin Yan1 , David Chu2 {yan, ganesan}@cs.umass.edu, {davidchu, kansal, jie.liu}@microsoft.com ABSTRACT As mobile apps become more closely integrated into our everyday lives, mobile app interactions ought to be rapid

Ganesan, Deepak

140

Fast app launching for mobile devices using predictive user context  

Microsoft Academic Search

As mobile apps become more closely integrated into our everyday lives, mobile app interactions ought to be rapid and responsive. Unfortunately, even the basic primitive of launching a mobile app is sorrowfully sluggish: 20 seconds of delay is not uncommon even for very popular apps. We have designed and built FALCON to remedy slow app launch. FALCON uses contexts such

Tingxin Yan; David Chu; Deepak Ganesan; Aman Kansal; Jie Liu

2012-01-01

141

Research on Mobile GIS Based for Information Collection  

Microsoft Academic Search

With the rapid development of GIS, embedded technology and wireless communication technology, mobile GIS becomes an active research area in the field of GIS. Mobile computing system based on personal digital assistant (PDA) products has been used widely, and information collection is one of the most promising application directions of mobile GIS. The purpose of the paper is to propose

Chen Feixiang; Zhao Ming; Qi Jiandong; Jiang Xiaoru

2009-01-01

142

Personal Environment Service for Mobile Users Jongtaek Oh  

E-print Network

Personal Environment Service for Mobile Users Jongtaek Oh Dept. Information & Communications The rapid progress of radio communication technologies stimulated the introduction of new mobile, through the use of a SIM (Subscriber Identity Module) card for GSM (Global System for Mobile Communication

Haas, Zygmunt J.

143

Mobile Learning: Using SMS in Educational Contexts Adelina Moura1  

E-print Network

so rapidly adopted as mobile technologies. The evolution of wireless communication has created a new dependent on this device for communication [2]. However, according to Schick [3], most people with mobile communication system and popular among mobile phone users. It has become a trend as a means of communication

Paris-Sud XI, Université de

144

Talk about Texting: Attitudes towards Mobile Phones Naomi S. Baron  

E-print Network

examines user perspectives on mobile communication, with special emphasis on texting functions. Keywords of mobile communication has been remarkably rapid. According to the International Telecommunication Union), or accessing mobile news (Westlund in press). But primarily, they are employed for communication, most often

Lansky, Joshua

145

Personal Portable Pedestrian: Lessons from Japanese Mobile Phone Use  

E-print Network

of Southern California Keio University Paper presented at Mobile Communication and Social Change, the 2004 International Conference on Mobile Communication in Seoul, Korea, October 18-19, 2004 Ever since rapid adoption that there are similarities in the overall technosocial ecologies of mobile media practice and communication. Nothing

Ito, Mimi

146

Applying mobile IP over wireless ATM communication networks  

Microsoft Academic Search

Advances in mobile devices' and networks' technology have set a challenging pace for all new proposals in the rapidly growing domain of mobile communications. The decade of the 90's brought a revolution in mobile computing. The explosion in sales of laptop PCs as well as personal digital assistants and cellular phones has marked the beginning of a new era in

J. Soldatos; D. D. Vergados; N. Protopsaltis; C. Lykou; G. Kormentzas; C. Anagnostopoulos; M. Theologou

2001-01-01

147

iPhotobook: creating photo books on mobile devices  

Microsoft Academic Search

The amount of photo that is captured and stored with mobile devices is growing rapidly. We regularly see traditional desktop multimedia applications being ported to mobile devices. However, less often do we see novel interaction mechanism being developed to effectively deal with the physical limitations of the display and input of such devices. We built a mobile application called iPhotobook

Jun Xiao; Nic Lyons; Clayton Brian Atkins; Yuli Gao; Hui Chao; Xuemei Zhang

2010-01-01

148

Microbial influence on metal mobility and application for bioremediation  

Microsoft Academic Search

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

Geoffrey M. Gadd

2004-01-01

149

Firewall for Dynamic IP Address in Mobile IPv6  

NASA Astrophysics Data System (ADS)

Mobile communication is becoming the mainstream with the rapid growth of mobile devices penetrating our daily life. More and more mobile devices such as mobile phones, personal digital assistants, notebooks etc, are capable of Internet access. Mobile devices frequently change their communication IP addresses in mobile IPv6 network following its current attached domain. This raises a big challenge for building firewall for mobile devices. The conventional firewalls are primarily based on IPv4 networks where the security criteria are specified only to the fixed IP addresses or subnets, which apparently do not apply to mobile IPv6. In this paper we propose three solutions for mobile IPv6 firewall. Our approaches make the firewall adaptive to dynamic IP addresses in mobile IPv6 network. They have different expense and weight corresponding to different degree of universality. The paper focuses the study more from practical aspect.

Qiu, Ying; Bao, Feng; Zhou, Jianying

150

Time-varying Signature Vectors Estimation for Multicarrier CDMA Systems  

Microsoft Academic Search

In this paper, a blind adaptive signature vectors estimation algorithm for Multicarrier (MC) CDMA system in rapidly time-varying multipath fading channel is proposed. This algorithm adopts PROTEUS algorithm to estimate signal subspace and is an adaptive low dimension implementation of subspace projection method in virtue of the special update form of PROTEUS algorithm. In the case that multiple antennas are

Yiwen Zhang; Qinye Yin; Le Ding

2006-01-01

151

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

E-print Network

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 ...

Surya, Yulia

2009-01-01

152

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

PubMed Central

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

Zhang, Zhongzhao; Ma, Lin; Chen, Jiamei

2014-01-01

153

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

PubMed

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

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

2014-01-01

154

Mobile Gamification in EducationEngage, Educate and Entertain via Gamified Mobile Apps  

Microsoft Academic Search

Digital games are very popular amongst the digital natives; they use them for entertainment engagement, enjoyment and fun. With the emergence of the internet and mobile apps edutainment and gamification is also becoming increasingly important in the educational sector. With the rapid development of mobile technologies and applications, games are now entering a new era where their purpose is no

Ferial Khaddage; Christoph Lattemann; Ricardo Acosta-Díaz

2014-01-01

155

Interoperability between Mobile IPv4 and Mobile IPv6 based on MPLS core network  

Microsoft Academic Search

The wireless network with its rapid development and wide use, will be the next investigation of researchers because there are many obstacles that must be passed to completely deploy it at present and on the future. This paper focuses on one part of the wireless field, that is, the interoperability between mobile IPv4 and mobile IPv6. For better QoS services

Tran Cong Hung; Nguyen Ngoc Chan; Nguyen Duc Thang; Truong Dinh Huy

2007-01-01

156

Topobathymetric model of Mobile Bay, Alabama  

USGS Publications Warehouse

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/.

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

2013-01-01

157

Rapid Airplane Parametric Input Design (RAPID)  

NASA Technical Reports Server (NTRS)

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.

Smith, Robert E.

1995-01-01

158

A Peer-to-Peer Resource Sharing System with Data Grid Technology for Mobile Devices  

Microsoft Academic Search

Increases in mobile device processing power, storage capacity, and connectivity in recent years have led to a rapid rise in mobile device use. But mobile users face challenges in making connections with other users in order to share resources. To address this issue, we propose an architecture that uses peer-to-peer protocol to establish a resource sharing platform for mobile devices,

Chao-tung Yang; Chun-jen Chen; Ching-hsien Hsu

2007-01-01

159

International Diffusion of Digital Mobile Technology: A Coupled-Hazard State-Based Approach  

Microsoft Academic Search

The convergence of the Internet, electronic commerce, and wireless technology has created the basis for the rapid global diffusion of mobile commerce. We believe that one approach to understand mobile commerce diffusion is to study the diffusion of digital mobile devices required in mobile commerce activities. Although prior research in technology diffusion has identified a set of variables that affect

ROBERT J. KAUFFMAN; ANGSANA A. TECHATASSANASOONTORN

160

Security versus Energy Tradeoffs in Host-Based Mobile Malware Detection  

E-print Network

Security versus Energy Tradeoffs in Host-Based Mobile Malware Detection Jeffrey Bickford H. Andrés 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, caus- ing users to disable

Shihada, Basem

161

Determinants of Mobile Learning Acceptance: An Empirical Investigation in Higher Education  

ERIC Educational Resources Information Center

Scope and method of study: The purpose of this study was to investigate the determinants of mobile learning acceptance in higher education. Mobile learning is a rapidly growing method of learning that utilizes mobile devices to deliver content. Acceptance of mobile learning theory was derived from technology acceptance theories. The study…

Akour, Hassan

2010-01-01

162

Artist Mobiles.  

ERIC Educational Resources Information Center

Describes an art teacher's attempt to get away from standard student reports on famous artists and to make the project more fun and creative. Explains how students were asked to combine traditional research skills with creativity to produce mobiles with information and pictures related to their artist. (DSK)

Solberg, Margaret Ewert

1998-01-01

163

Atomic Mobile  

NSDL National Science Digital Library

Learners make a mobile model of a carbon atom using clay, wire, and pipe cleaners. Learners will use the periodic table as a guide and explore how atoms are made up of a nucleus of protons and neutrons with orbiting electrons. The activity includes a PDF file of a periodic table and a guide for reading it.

American Museum of Natural History

2012-06-26

164

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.

165

Mobile access control vestibule  

NASA Astrophysics Data System (ADS)

The mobile access control vestibule (MACV) is an adaptation of techniques developed for mobile military command centers. The overall configuration of modules acts as an entry control/screening facility or transportable command center. The system would provide the following capabilities: (1) A key element for force protection, rapid deployment units sent to areas having no prepositioned equipment or where there has been a degradation of that equipment as a result of natural disasters or civil unrest. (2) A rapidly deployable security control center to upgrade the security at nonmilitary sites (e.g., diplomatic or humanitarian organizations). (3) Personnel screening, package screening, badge/identification card production for authorized personnel, centralized monitoring of deployed perimeter sensors, and centralized communications for law enforcement personnel. (4) Self-contained screening and threat detection systems, including explosives detection using the system developed by Sandia National Laboratories for the FAA. When coupled with transportable electric generators, the system is self-sufficient. The communication system for the MACV would be a combination of physically wired and wireless communication units that supports by ad hoc networking.

DePoy, Jennifer M.

1998-12-01

166

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

E-print Network

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 ...

Mandala, Ashok Chakravarthy

2007-01-01

167

Best effort QoS support routing in mobile ad hoc networks   

E-print Network

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 ...

Luo, Heng

2012-06-25

168

Mobility Types for Mobile Ambients  

Microsoft Academic Search

An ambient is a named cluster of processes and subambients, whichmoves as a group. The untyped ambient calculus is a process calculusin which ambients model a variety of concepts such as network nodes,packets, channels, and software agents. In these models, some ambientsare intended to be mobile, some immobile; and some are intendedto be ephemeral, some persistent. We describe type systems

Luca Cardelli; Andrew D. Gordon; Giorgio Ghelli

1999-01-01

169

Mobility 2035  

E-print Network

addresses the mobility needs of the Study Area to the year 2035 in the following chapters: 1) Demographic Development 2) Scenario Analysis 3) Public Involvement 4) Bicycle System 5) Pedestrian System 6) Public Transportation 7) Roadway Needs 8...) Freight 9) Environmental 10) Congestion Management process 11) Financial Information 12) Funded and Unfunded Roadway, Bicycle and Pedestrian Project Lists Distribution Statement: This report is available through the San Antonio-Bexar County...

San Antonio-Bexar County Metropolitan Planning Organization

2009-12-07

170

Mobile Agent Middleware for Mobile Computing  

Microsoft Academic Search

Mobile computing requires an advanced infrastructure that integrates suitable support protocols, mechanisms, and tools. This mobility middleware should dynamically reallocate and trace mobile users and terminals and permit communication and coordination of mobile entities. In addition, open and untrusted environments must overcome system heterogeneity and grant the appropriate security level. Solutions to these issues require compliance with standards to interoperate

Paolo Bellavista; Antonio Corradi; Cesare Stefanelli

2001-01-01

171

Mobile Computing/Mobile Computing/Mobile Computing/Mobile Computing/ Mobile NetworksMobile NetworksMobile NetworksMobile Networks  

E-print Network

Mobile IP Agent Discovery Registration Tunneling Route Optimization Current Topics #12;3 Simplified for location, the other for routing #12;9 Node Moves... agent mobile host (he travels here) agent sender mobile point-of-attachment while maintaining communication Home Agent: Router with an interface on the Mobile

Yu, Chansu

172

Going mobile  

NASA Astrophysics Data System (ADS)

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.

Brus, Eric

1987-12-01

173

Contagion dynamics in time-varying metapopulation networks  

NASA Astrophysics Data System (ADS)

The metapopulation framework is adopted in a wide array of disciplines to describe systems of well separated yet connected subpopulations. The subgroups or patches are often represented as nodes in a network whose links represent the migration routes among them. The connections have been so far mostly considered as static, but in general evolve in time. Here we address this case by investigating simple contagion processes on time-varying metapopulation networks. We focus on the SIR process and determine analytically the mobility threshold for the onset of an epidemic spreading in the framework of activity-driven network models. We find profound differences from the case of static networks. The threshold is entirely described by the dynamical parameters defining the average number of instantaneously migrating individuals and does not depend on the properties of the static network representation. Remarkably, the diffusion and contagion processes are slower in time-varying graphs than in their aggregated static counterparts, the mobility threshold being even two orders of magnitude larger in the first case. The presented results confirm the importance of considering the time-varying nature of complex networks.

Liu, Su-Yu; Baronchelli, Andrea; Perra, Nicola

2013-03-01

174

Mobility of Protozoa through Narrow Channels  

PubMed Central

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

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

2005-01-01

175

Mobile Atmospheric Sensing using Vision Approach  

NASA Astrophysics Data System (ADS)

Air quality monitoring, especially the atmospheric phenomenon of thick haze, has been an acute problem in most countries and a hot topic in the atmospheric sensing. Recently thick haze occurs more frequently in most cities of China due to the rapid growth of traffic, farming, wildfires, and industrial development. It forms a low-hanging shroud that impairs visibility and becomes a respiratory health threat. Traditionally the dust, smoke, and other particles in relatively dry sky are reported at fixed meteorological stations. The coverage of these sampling stations is limited and cannot accommodate with the emergent incidence of thick haze from industrial pollution. In addition, the visual effect of thick haze is not yet investigated in the current practice. Thick haze appears colorful veil (e.g., yellowish, brownish-grey, etc) in video log images and results in a loss of contrast in the subject due to the light scattering through haze particles. This paper proposes an intuitive and mobile atmospheric sensing using vision approach. Based on the video log images collected by a mobile sensing vehicle, a Haze Veil Index (HVI) is proposed to identify the type and severity level of thick haze from the color and texture perspective. HVI characterizes the overall veil effect of haze spatially. HVI first identifies the haze color from the color deviation histogram of the white-balanced hazy image. The white-balancing is conducted with the most haze-opaque pixels in the dark channel and seed growing strategy. Then pixel-wise haze severity level of atmospheric veil is inferred by approximating the upper veil limit with the dark color of each pixel in a hazy image. The proposed method is tested on a diverse set of actual hazy video log images under varying atmospheric conditions and backgrounds in Wuhan City, China. Experimental results show the proposed HVI is effective for visually atmospheric sensing. The proposed method is promising for haze monitoring and prediction in UAV and satellite remote-sensing images.

Huang, Yuchun; Cui, Weihong; Rui, Yi

2014-03-01

176

Epidemic spreading in time-varying community networks  

SciTech Connect

The spreading processes of many infectious diseases have comparable time scale as the network evolution. Here, we present a simple networks model with time-varying community structure, and investigate susceptible-infected-susceptible epidemic spreading processes in this model. By both theoretic analysis and numerical simulations, we show that the efficiency of epidemic spreading in this model depends intensively on the mobility rate q of the individuals among communities. We also find that there exists a mobility rate threshold q{sub c}. The epidemic will survive when q?>?q{sub c} and die when q?

Ren, Guangming, E-mail: wangxy@dlut.edu.cn, E-mail: ren-guang-ming@163.com [School of Electronic and Information, Guangdong Polytechnic Normal University, Guangzhou 510665 (China) [School of Electronic and Information, Guangdong Polytechnic Normal University, Guangzhou 510665 (China); Faculty of Electronic Information and Electrical Engineering, Dalian University of Technology, Dalian 116024 (China); Wang, Xingyuan, E-mail: wangxy@dlut.edu.cn, E-mail: ren-guang-ming@163.com [Faculty of Electronic Information and Electrical Engineering, Dalian University of Technology, Dalian 116024 (China)] [Faculty of Electronic Information and Electrical Engineering, Dalian University of Technology, Dalian 116024 (China)

2014-06-15

177

An Improved, Rapid Northern Protocol  

Microsoft Academic Search

We report a simple, sensitive and rapid method for performing Northern blotting analysis which avoids the use of toxic chemicals such as formamide and glyoxal. This technique allows sensitive detection of various transcripts from total RNA samples varying from 10?g to 2.5?g. These samples were probed for GAPDH and VCAM mRNA message using this technique and show similar results as

Christopher G. Kevil; Loren Walsh; F. Stephen Laroux; Theodore Kalogeris; Matthew B. Grisham; J. S. Alexander

1997-01-01

178

Classical Mobility of Highly Mobile Crystal Defects  

NASA Astrophysics Data System (ADS)

Highly mobile crystal defects such as crowdions and prismatic dislocation loops exhibit an anomalous temperature independent mobility unexplained by phonon scattering analysis. Using a projection operator, without recourse to elasticity, we derive analytic expressions for the mobility of highly mobile defects and dislocations which may be efficiently evaluated in molecular dynamics simulation. The theory explains how a temperature-independent mobility arises because defect motion is not an eigenmode of the Hessian, an implicit assumption in all previous treatments.

Swinburne, T. D.; Dudarev, S. L.; Sutton, A. P.

2014-11-01

179

Concordia: An Infrastructure for Collaborating Mobile Agents  

Microsoft Academic Search

Use of the Internet and the World-Wide-Web has become widespread in recent years and mobile agent technology has proliferated at an equally rapid rate. In this paper, we introduce the Concordia infrastructure for the development and management of network-efficient mobile agent applications for accessing information anytime, anywhere, and on any device. Concordia has been implemented in the Java language to

David Wong; Noemi Paciorek; Tom Walsh; Joe Dicelie; Mike Young; Bill Peet

1997-01-01

180

A Survey of Mobile Indoor Navigation Systems  

Microsoft Academic Search

\\u000a With the gradual maturating of ubiquitous computing and the rapid advances in mobile devices and wireless communication, indoor\\u000a Location Based Services have gained increasing interests as an important application of indoor ubiquitous computing. In this\\u000a paper, an evaluation framework which combines the key aspects of indoor navigation for investigating mobile indoor navigation\\u000a systems is proposed. Based on this evaluation framework,

Haosheng Huang; Georg Gartner

181

Pathways of Servitisation in Mobility Systems  

Microsoft Academic Search

\\u000a The automotive industry is confronted with an increasing servitisation and rising mobility needs. At the same time the rapid\\u000a development in information technology sets up new possibilities to create telematic solutions and to strike new paths in the\\u000a development of mobility concepts.\\u000a \\u000a \\u000a This paper points out the developments in individual transport of passengers and the progress in information technology development

Christoph Herrmann; Katrin Kuntzky; Julian Stehr

182

Effects of glycerol on the molecular mobility and hydrogen bond network in starch matrix.  

PubMed

The effects of glycerol on molecular mobility and hydrogen bonding network in an amorphous glassy starch matrix were studied using phosphorescence and IR spectroscopy. Amorphous potato starch films containing varying amounts of glycerol (0, 5, 10, 20 and 30 wt.%) were formulated by rapidly dehydrating aqueous potato starch gel (5%, w/v) with a corresponding content of glycerol; X-ray diffraction data confirm that the films contained negligible content of crystalline starch. Erythrosin B (Ery B) phosphorescence was used to monitor the molecular mobility of these matrices over the temperature range from 0 to 100°C. Analysis of Ery B emission peak frequency, band width and intensity decay provided information about thermally-activated modes of molecular mobility in the matrix. Dipolar relaxation around the triplet state of Ery B was enhanced by addition of glycerol and the extent of relaxation increased at low and intermediate but decreased at higher temperature. The glycerol content-dependent onset temperature for this transition was 70°C for pure starch and decreased to 40°C for a matrix with 30% glycerol. Measurements of the rate of non-radiative decay from the Ery B triplet state indicated that glycerol plasticized the starch matrix above ?10 wt.% while acting as an antiplastizer to increase the matrix molecular mobility at lower content. These matrix properties were related to glycerol-dependent increases in hydrogen bond strength as measured by IR. PMID:25439911

Liang, Jun; Ludescher, Richard D

2015-01-22

183

Continuously Connected With Mobile IP  

NASA Technical Reports Server (NTRS)

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.

2002-01-01

184

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.

185

Mobile and Ubiquitous Computing Cellular Mobile and Implications of Mobility  

E-print Network

in More Depth · Wireless communication ­ Dis.roussos@dcs.bbk.ac.uk Session Overview · How cellular mobile systems work ­ Elements ­ Methods · Implications of mobility for computing ­ Wireless ­ Mobility ­ Portability · Research in 1960's and 1970's at Bell Labs led

Roussos, George

186

Rapid prototyping of rapid prototyping machines  

E-print Network

Rapid prototyping tools empower individuals to create almost anything. Unfortunately, these tools are still far too expensive for personal ownership. The do-it-yourself community has responded with a slew of home-made rapid ...

Moyer, Ilan Ellison

2008-01-01

187

Gait phase varies over velocities.  

PubMed

We sought to characterize the percent (PT) of the phases of a gait cycle (GC) as velocity changes to establish norms for pathological gait characteristics with higher resolution technology. Ninety five healthy subjects (49 males and 46 females with age 34.9 ± 11.8 yrs, body weight 64.0 ± 11.7 kg and BMI 23.5 ± 3.6) were enrolled and walked comfortably on a 10-m walkway at self-selected slower, normal, and faster velocities. Walking was recorded with a high speed camera (250 frames per second) and the eight phases of a GC were determined by examination of individual frames for each subject. The correlation coefficients between the mean PT of the phases of the three velocities gaits and PT defined by previous publications were all greater than 0.99. The correlation coefficient between velocity and PT of gait phases is -0.83 for loading response (LR), -0.75 for mid stance (MSt), and -0.84 for pre-swing (PSw). While the PT of the phases of three velocities from this study are highly correlated with PT described by Dr. Jacquenlin Perry decades ago, actual PT of each phase varied amongst these individuals with the largest coefficient variation of 24.31% for IC with slower velocity. From slower to faster walk, the mean PT of MSt diminished from 35.30% to 25.33%. High resolution recording revealed ambiguity of some gait phase definitions, and these data may benefit GC characterization of normal and pathological gait in clinical practice. The study results indicate that one should consider individual variations and walking velocity when evaluating gaits of subjects using standard gait phase classification. PMID:24192276

Liu, Yancheng; Lu, Kun; Yan, Songhua; Sun, Ming; Lester, D Kevin; Zhang, Kuan

2014-02-01

188

Mobile Transporter  

NASA Technical Reports Server (NTRS)

The Space Shuttle Atlantis, STS-110 mission, deployed this railcar, called the Mobile Transporter, and an initial 43-foot section of track, the S0 (S-zero) truss, preparing the International Space Station (ISS) for future spacewalks. The first railroad in space, the Mobile Transporter will allow the Station's robotic arm to travel up and down the finished truss for future assembly and maintenance. The 27,000-pound S0 truss is the first of 9 segments that will make up the Station's external framework that will eventually stretch 356 feet (109 meters), or approximately the length of a football field. The completed truss structure will hold solar arrays and radiators to provide power and cooling for additional international research laboratories from Japan and Europe that will be attached to the Station. The Space Shuttle Orbiter Atlantis, STS-110 mission, was launched April 8, 2002 and returned to Earth April 19, 2002. STS-110's Extravehicular Activity (EVA) marked the first use of the Station's robotic arm to maneuver spacewalkers around the Station.

2001-01-01

189

Mobile Instruments Measure Atmospheric Pollutants  

NASA Technical Reports Server (NTRS)

As a part of NASA's active research of the Earth s atmosphere, which has included missions such as the Atmospheric Laboratory of Applications and Science (ATLAS, launched in 1992) and the Total Ozone Mapping Spectrometer (TOMS, launched on the Earth Probe satellite in 1996), the Agency also performs ground-based air pollution research. The ability to measure trace amounts of airborne pollutants precisely and quickly is important for determining natural patterns and human effects on global warming and air pollution, but until recent advances in field-grade spectroscopic instrumentation, this rapid, accurate data collection was limited and extremely difficult. In order to understand causes of climate change and airborne pollution, NASA has supported the development of compact, low power, rapid response instruments operating in the mid-infrared "molecular fingerprint" portion of the electromagnetic spectrum. These instruments, which measure atmospheric trace gases and airborne particles, can be deployed in mobile laboratories - customized ground vehicles, typically - to map distributions of pollutants in real time. The instruments must be rugged enough to operate rapidly and accurately, despite frequent jostling that can misalign, damage, or disconnect sensitive components. By measuring quickly while moving through an environment, a mobile laboratory can correlate data and geographic points, revealing patterns in the environment s pollutants. Rapid pollutant measurements also enable direct determination of pollutant sources and sinks (mechanisms that remove greenhouse gases and pollutants), providing information critical to understanding and managing atmospheric greenhouse gas and air pollutant concentrations.

2009-01-01

190

Identification of time-varying dynamics of the human triceps surae stretch reflex  

Microsoft Academic Search

We have examined the time variations of stretch reflex dynamics throughout rapid voluntary changes in the isometric contraction level of the human triceps surae muscles. This was achieved by superimposing a small stochastic displacement upon many such changing contractions and then identifying the time-varying relationship between the perturbation and the evoked electromyograms (EMGs). An “ensemble” time-varying system identification technique was

Robert F. Kirsch; Robert E. Kearney; J. Bart MacNeil

1993-01-01

191

Strategic analysis of mobile money ventures in Developing countries  

E-print Network

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 ...

Caballero, Luis (Luis Alberto Caballero Parra)

2012-01-01

192

Development of a mobile research flight test support capability  

NASA Technical Reports Server (NTRS)

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.

Rhea, Donald C.; Moore, Archie L.

1988-01-01

193

Development of a mobile research flight test support capability  

NASA Technical Reports Server (NTRS)

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.

Rhea, Donald C.; Moore, Archie L.

1988-01-01

194

Cooperating mobile robots  

DOEpatents

A miniature mobile robot provides a relatively inexpensive mobile robot. A mobile robot for searching an area provides a way for multiple mobile robots in cooperating teams. A robotic system with a team of mobile robots communicating information among each other provides a way to locate a source in cooperation. A mobile robot with a sensor, a communication system, and a processor, provides a way to execute a strategy for searching an area.

Harrington, John J.; Eskridge, Steven E.; Hurtado, John E.; Byrne, Raymond H.

2004-02-03

195

Rapid shallow breathing  

MedlinePLUS

Tachypnea; Breathing - rapid and shallow; Fast shallow breathing; Respiratory rate - rapid and shallow ... Shallow, rapid breathing has many possible medical causes, including: Asthma Blood clot in an artery in the lung Choking Chronic obstructive ...

196

Detecting energy-greedy anomalies and mobile malware variants  

Microsoft Academic Search

Mobile users of computation and communication services have been rapidly adopting battery-powered mobile hand- helds, such as PocketPCs and SmartPhones, for their work. However, the limited battery-lifetime of these devices re- stricts their portability and applicability, and this weak- ness can be exacerbated by mobile malware targeting de- pletion of battery energy. Such malware are usually di-- cult to detect

Hahnsang Kim; Joshua Smith; Kang G. Shin

2008-01-01

197

Performance Evaluation of Vehicular DTN Routing under Realistic Mobility Models  

Microsoft Academic Search

Abstract—In performance,studies of vehicular ad hoc networks (VANETs), the underlying mobility model plays an important role. Since conventional mobile ad hoc network,(MANET) routing protocols do not work,efficiently in vehicular environments,due to the rapid topology changes, the Delay-Tolerant Network (DTN) model is often applied. In this paper, we construct a new mobility model, the Shanghai Urban Vehicular Network (SUVnet) model by

Pei'en Luo; Hongyu Huang; Wei Shu; Minglu Li; Min-you Wu

2008-01-01

198

Let's Play Together with the Camera of Your Mobile Device  

Microsoft Academic Search

Currently mobile games for educational purposes are a rapidly developing area. In this work we focus on multiplayer mobile\\u000a games and specific aspects such as communication and collaboration between players and learners. This knowledge is valuable\\u000a not only for further game development with an educational purpose but in any type of mobile games. However, during our research\\u000a we have observed

Ekaterina Kuts; Carolina Islas-Sedano; Erkki Sutinen

199

A Research on Application of Mobile Commerce in Logistics Industry  

Microsoft Academic Search

The rapid development of mobile commerce (m-commerce) has profound influence on logistics industry. Firstly, through analysis\\u000a that combines m-commerce and the logistics industry, the paper draws a conclusion that main m-commerce applications in logistics\\u000a industry include cargo tracking, mobile inventory management, vehicle positioning and M2M (machine to machine) mobile services.\\u000a Then, we think traditional logistics has entered the stage of

Gaoguang Li; Lv Tingjie

2007-01-01

200

Contagion dynamics in time-varying metapopulation networks  

NASA Astrophysics Data System (ADS)

The metapopulation framework is adopted in a wide array of disciplines to describe systems of well separated yet connected subpopulations. The subgroups/patches are often represented as nodes in a network whose links represent the migration routes among them. The connections are usually considered as static, an approximation that is appropriate for the description of many systems, such as cities connected by human mobility, but it is obviously inadequate in those real systems where links evolve in time on a faster timescale. In the case of farmed animals, for example, the connections between each farm/node vary in time according to the different stages of production. Here we address this case by investigating simple contagion processes on temporal metapopulation networks. We focus on the SIR process, and we determine the mobility threshold for the onset of an epidemic spreading in the framework of activity-driven network models. Remarkably, we find profound differences from the case of static networks, determined by the crucial role played by the dynamical parameters defining the average number of instantaneously migrating individuals. Our results confirm the importance of addressing the time-varying properties of complex networks pointed out by the recent literature.

Baronchelli, Andrea; Liu, Suyu; Perra, Nicola

2013-03-01

201

Personalized Intelligent Mobile Learning System for Supporting Effective English Learning  

Microsoft Academic Search

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

Chih-ming Chen; Shih-hsun Hsu

2008-01-01

202

International Mobility of Canadian Social Sciences and Humanities Doctoral Students  

ERIC Educational Resources Information Center

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…

Knight, Jane; Madden, Meggan

2010-01-01

203

Globalization and International Student Mobility: A Network Analysis  

ERIC Educational Resources Information Center

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…

Shields, Robin

2013-01-01

204

Mobile Wireless Computing: Solutions and Challenges in Data Management  

Microsoft Academic Search

Mobile computing is a new emerging computing paradigm posing many challenging datamanagement problems. We identify these new challenges and investigate their technical significance.New research problems include management of location dependent data, frequentdisconnections, structuring distributed algorithms for mobile hosts, wireless data broadcasting,and energy efficient data access.1 IntroductionThe rapidly expanding technology of cellular communications, wireless LAN, and satellite...

Tomasz Imielinski; B. r. Badrinath

1993-01-01

205

Efficient Key Distribution Schemes for Large Scale Mobile Computing Applications  

E-print Network

openers, security cameras etc., equipped with short range radios, will be controlled by hand-held devices networks consisting of large-scale deployments of mobile devices, efficient security mechanisms for securing large scale deployments of mobile devices. I. INTRODUCTION Rapidly lowering costs of computing

206

A survey of mobile malware in the wild  

Microsoft Academic Search

Mobile malware is rapidly becoming a serious threat. In this paper, we survey the current state of mobile malware in the wild. We analyze the incentives behind 46 pieces of iOS, Android, and Symbian malware that spread in the wild from 2009 to 2011. We also use this data set to evaluate the effectiveness of techniques for preventing and identifying

Adrienne Porter Felt; Matthew Finifter; Erika Chin; Steve Hanna; David Wagner

2011-01-01

207

Assemblage, adaptation and apps: Smartphones and mobile gaming  

Microsoft Academic Search

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

Christian Christensen; Patrick Prax

2012-01-01

208

Mobile agent middleware for sensor networks: an application case study  

Microsoft Academic Search

Agilla is a mobile agent middleware that facilitates the rapid deployment of adaptive applications in wireless sensor networks (WSNs). Agilla allows users to create and inject special programs called mobile agents that coordinate through local tuple spaces, and migrate across the WSN performing application-specific tasks. This fluidity of code and state has the potential to transform a WSN into a

Chien-liang Fok; Gruia-catalin Roman; Chenyang Lu

2005-01-01

209

Arabic Sign Language Translation System On Mobile Devices  

Microsoft Academic Search

Summary Sign Language Translation System\\/software that translates text into sign language animations could significantly improve deaf lives especially in communication and accessing information. In the last few years the usages of technology have increased rapidly. One of the most popular technologies is the invention of mobile devices. The most common application is mobile phones for voice transmission, but systems for

Sami M. Halawani

2008-01-01

210

Income, Inequality, Market Potential, and Diffusion of Mobile Telephony  

ERIC Educational Resources Information Center

The diffusion of many previous innovations eventually slowed down and reached an equilibrium level. Despite continued rapid growth, it is possible that the diffusion of mobile telephony will also begin to decelerate and reach a saturation level. Whether universal service can be achieved with the help of mobile telephony will therefore depend…

Kim, Sungjoong

2009-01-01

211

Keys for growth in Japan's mature mobile market  

E-print Network

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 ...

Oto, Hiroyuki

2005-01-01

212

Anchored Mobilities: Mobile Technology and Transnational Migration  

E-print Network

. In order to understand people's uptake and diverse uses of mobile technology, we need to understand people mobility. We present an ethnography of transnational Thai retirees and their uses of mobile technology shown a growing interest in recent years in global studies of personal technology use [27], use

Dourish,Paul

213

Mobile Schools for a Mobile World  

ERIC Educational Resources Information Center

Overwhelmingly, independent schools are embracing mobile devices--laptops, iPads or other tablets, and smartphones--to enhance teaching and learning. This article describes the results of the "NAIS 2012 Mobile Learning Survey." Among its findings were that 75 percent of NAIS-member schools currently use mobile learning devices in at…

Booth, Susan

2013-01-01

214

Stable Flocking of Mobile Agents Part II: Dynamic Topology  

E-print Network

Stable Flocking of Mobile Agents Part II: Dynamic Topology Herbert G. Tanner Mechanical Engineering the stability properties of a system of multiple mobile agents with double integrator dynamics. In this second part, we allow the topology of the control inter- connections between the agents in the group to vary

Tanner, Herbert G.

215

MAC Sleep Mode Control Considering Downlink Traffic Pattern and Mobility  

E-print Network

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

Bahk, Saewoong

216

Industry track: towards an internet mobility management architecture  

Microsoft Academic Search

Mobile nodes represent a particular challenge for the Internet architecture. In this document, we describe the basic architectural problem posed by mobile nodes and review solutions which have been proposed to solve it. The solutions represent either widely deployed proprietary solutions, Internet standards in varying stages of deployment, or solutions that are currently being examined for possible standardization and deployment.

James Kempf; Phil Roberts

2006-01-01

217

System Identification: Time Varying and Nonlinear Methods  

E-print Network

to develop first few time step models is detailed, providing a unified solution to the time varying identification problem. The practical problem of identifying the time varying generalized Markov parameters required for TVERA is presented as the next result...

Majji, Manoranjan

2010-07-14

218

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

NASA Astrophysics Data System (ADS)

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

Davies, W.

219

Essays on Mobile Advertising and Commerce  

E-print Network

Response Strategies, Ad Fatigue Extension . . . . . . . . 25 1.4.2 Symmetric Nash Equilibrium, Ad Fatigue become ever more ubiquitous and powerful. Many of the market structures that enable mobile commerce are still under rapid development and afford us opportunities to ask new questions about market design

Chen, Yiling

220

Mobile Internet Application to Geographical Information Services  

Microsoft Academic Search

The nearly ubiquitous access to the internet and interactive content of the WWW has made people a powerful means to access, exchange, and process information. Geographic information\\/data is the most important and costliest part of GIS, and it could become quickly out of date and thus need to be constantly updated. With the rapid evolution of mobile communication technologies (3G,

Jusuo Zhou; Anliang Ning; Rui Deng; Fanshun Meng

2009-01-01

221

Rapid thermal oxidation of zinc nitride film  

NASA Astrophysics Data System (ADS)

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.

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

2015-04-01

222

Land Mobile Satellite Antenna Development at JPL  

NASA Technical Reports Server (NTRS)

JPL has developed several mobile-vehicular antenna systems for satellite service throughout the last decade. The frequency bands cover UHF through Ka-band, and the antennas vary from high-gain with automatic satellite-tracking to omni-directional.

Densmore, A.; Jamnejad, V.; Tulintseff, A.; Huang, J.; Lee, K.; Sukamto, L.; Crist, R.

1993-01-01

223

Variable rate QAM for mobile radio  

Microsoft Academic Search

Quadrature amplitude modulation (QAM) schemes which vary the number of modulation levels in accordance with the mobile radio fading channel variations are investigated. Important parameters considered are the fading rate and the block size used. We describe how the adaptive QAM modems can be employed and consider their use in a DECT-like TDD packet structure. System performance in the presence

W. T. Webb; R. Steele

1995-01-01

224

Anisotropic charged impurity-limited carrier mobility in monolayer phosphorene  

NASA Astrophysics Data System (ADS)

The room temperature carrier mobility in atomically thin 2D materials is usually far below the intrinsic limit imposed by phonon scattering as a result of scattering by remote charged impurities in its environment. We simulate the charged impurity-limited carrier mobility ? in bare and encapsulated monolayer phosphorene. We find a significant temperature dependence in the carrier mobilities (? ? T-?) that results from the temperature variability of the charge screening and varies with the crystal orientation. The anisotropy in the effective mass leads to an anisotropic carrier mobility, with the mobility in the armchair direction about one order of magnitude larger than in the zigzag direction. In particular, this mobility anisotropy is enhanced at low temperatures and high carrier densities. Under encapsulation with a high-? overlayer, the mobility increases by up to an order of magnitude although its temperature dependence and its anisotropy are reduced.

Ong, Zhun-Yong; Zhang, Gang; Zhang, Yong Wei

2014-12-01

225

Recommendations for Mobility in Children with Spinal Cord Injury  

PubMed Central

Background: Mobility is an important aspect of the rehabilitation of children with spinal cord injury (SCI), is a necessary component of life, and is critical in a child’s development. Depending upon the individual’s age and degree of neurological impairment, the nature of mobility may vary. Objectives: The objective of this article is to establish recommendations surrounding the selection of mobility for children with SCI. Methods: Extensive literature review and multidisciplinary peer review. Results: Types of mobility including power, manual, upright, and community are discussed, and recommendations are made based on medical necessity, neurological level, ASIA Impairment Scale score, and developmental considerations and challenges. Conclusion: Mobility is critical for proper development to occur in the pediatric population, and it may be challenging to make recommendations for mobility in children with SCI. It is essential for clinicians providing care to children with SCI to address mobility in a comprehensive and longitudinal manner across the children’s environments. PMID:23671384

2013-01-01

226

Mobile multi-user ATM platforms: architectures, design issues, and challenges  

Microsoft Academic Search

Rapid growth in use of the Internet at and away from the workplace has spurred tremendous interest in the provision of anytime-anywhere network connectivity to mobile users. Commonly studied mobility scenarios involve users equipped with portable data terminals roaming around at slow to moderate speeds within a coverage area. Mobile IP and wireless ATM are examples of protocols designed for

Prabhat Kumar; Leandros Tassiulas

2000-01-01

227

The Design and Evaluation of a Computerized Adaptive Test on Mobile Devices  

ERIC Educational Resources Information Center

The use of computerized adaptive testing (CAT) has expanded rapidly over recent years mainly due to the advances in communication and information technology. Availability of advanced mobile technologies provides several benefits to e-learning by creating an additional channel of access with mobile devices such as PDAs and mobile phones. This paper…

Triantafillou, Evangelos; Georgiadou, Elissavet; Economides, Anastasios A.

2008-01-01

228

Time and Space-Efficient Algorithms for Mobile Agents in an Anonymous Network  

E-print Network

Time and Space-Efficient Algorithms for Mobile Agents in an Anonymous Network THÃ?SE D;tel-00867765,version1-30Sep2013 #12;Time and Space-Efficient Algorithms for Mobile Agents,version1-30Sep2013 #12;Preface Computing with mobile agents is rapidly becoming a topic of mainstream

Paris-Sud XI, Université de

229

Using RSS to Support Mobile Learning Based on Media Richness Theory  

ERIC Educational Resources Information Center

With the rapid development of mobile technologies, mobile learning has become a new trend in education. A better understanding of how to effectively use communication technologies to improve mobile learning is important. The purpose of this paper is to evaluate the media richness of various message delivery methods in the proposed m-learning…

Lan, Yu-Feng; Sie, Yang-Siang

2010-01-01

230

Effects of Short-Term Memory and Content Representation Type on Mobile Language Learning  

ERIC Educational Resources Information Center

Due to the rapid advancements in mobile communication and wireless technologies, many researchers and educators have started to believe that these emerging technologies can be leveraged to support formal and informal learning opportunities. Mobile language learning can be effectively implemented by delivering learning content through mobile

Chen, Nian-Shing; Hsieh, Sheng-Wen; Kinshuk

2008-01-01

231

An Overview of Mobile Assisted Language Learning: From Content Delivery to Supported Collaboration and Interaction  

ERIC Educational Resources Information Center

Mobile learning is undergoing rapid evolution. While early generations of mobile learning tended to propose activities that were carefully crafted by educators and technologists, learners are increasingly motivated by their personal learning needs, including those arising from greater mobility and frequent travel. At the same time, it is often…

Kukulska-Hulme, Agnes; Shield, Lesley

2008-01-01

232

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

Microsoft Academic Search

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

Trish Andrews; R. Smyth; R. Caladine

2010-01-01

233

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

ERIC Educational Resources Information Center

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…

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

2005-01-01

234

Investigating the Determinants and Age and Gender Differences in the Acceptance of Mobile Learning  

ERIC Educational Resources Information Center

With the proliferation of mobile computing technology, mobile learning (m-learning) will play a vital role in the rapidly growing electronic learning market. M-learning is the delivery of learning to students anytime and anywhere through the use of wireless Internet and mobile devices. However, acceptance of m-learning by individuals is critical…

Wang, Yi-Shun; Wu, Ming-Cheng; Wang, Hsiu-Yuan

2009-01-01

235

MOBILE PHONES AND DEVELOPMENT: AN ANALYSIS OF IDRC-SUPPORTED PROJECTS  

Microsoft Academic Search

In the context of the rapid growth of mobile phone penetration in developing countries, mobile telephony is currently considered to be particularly important for development. Yet, until recently, very little systematic evidence was available that shed light on the developmental impacts of mobile telecommunication. The Information and Communication Technology for Development (ICT4D) program of the International Development Research Centre (IDRC),

Ahmed T. Rashid

236

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

SciTech Connect

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.

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

2009-01-01

237

Mobile Agents White Paper  

Microsoft Academic Search

this paper.IntroductionNew productsNew applicationsNew networksAbout "Mobile Agents"Enabling mobile agentsMobile agent paradigmMobile agent conceptsMobile agent technologyProgramming mobile agentsProgramming a placeProgramming an agentUsing mobile agentsMonitoring changing conditionsDoing time-consuming legworkUsing services in combinationThe user experienceHow agents provide the experienceVariations on the themeAcknowledgmentsRelated workReferencesIntroduction

Jim White

1996-01-01

238

How Mobility Increases Mobile Cloud Computing Processing Capacity  

E-print Network

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

Paris-Sud XI, Université de

239

Mobility Modeling and Routing in Sparse Mobile Network  

Microsoft Academic Search

Mobility plays a significant role in routing scheme for sparse mobile network. With the help of mobility, message can be forwarded through mobile users and performance of the network can be improved using mobility-assisted routing. In addition, a routing scheme needs to be verified through the simulation using certain mobility scenario. This review first introduces a variety of mobility models

Bo Gu

240

Location-Aware Mobile Multimedia Applications on the Niccimon platform  

E-print Network

|appelrath}@informatik.uni-oldenburg.de Abstract. In this paper, we present the Niccimon platform for the flexible and rapid development on this plat- form, we developed two demonstrator applications: a personalized mobile multimedia tourist guide research and industry. The platform is an important tool to allow the rapid development of prototypes

Appelrath, Hans-Jürgen

241

Mutual information in time-varying biochemical systems  

E-print Network

Cells must continuously sense and respond to time-varying environmental stimuli. These signals are transmitted and processed by biochemical signalling networks. However, the biochemical reactions making up these networks are intrinsically noisy, which limits the reliability of intracellular signalling. Here we use information theory to characterise the reliability of transmission of time-varying signals through elementary biochemical reactions in the presence of noise. We calculate the mutual information for both instantaneous measurements and trajectories of biochemical systems for a Gaussian model. Our results indicate that the same network can have radically different characteristics for the transmission of instantaneous signals and trajectories. For trajectories, the ability of a network to respond to changes in the input signal is determined by the timing of reaction events, and is independent of the correlation time of the output of the network. We also study how reliably signals on different time-scales can be transmitted by considering the frequency-dependent coherence and gain-to-noise ratio. We find that a detector that does not consume the ligand molecule upon detection can more reliably transmit slowly varying signals, while an absorbing detector can more reliably transmit rapidly varying signals. Furthermore, we find that while one reaction may more reliably transmit information than another when considered in isolation, when placed within a signalling cascade the relative performance of the two reactions can be reversed. This means that optimising signal transmission at a single level of a signalling cascade can reduce signalling performance for the cascade as a whole.

Filipe Tostevin; Pieter Rein ten Wolde

2010-06-16

242

Cluster Size and the Rapidity Gap-Length Distribution  

Microsoft Academic Search

The sensitivity of the rapidity gap-length distribution to the kinematical effects caused by clustering, but with the multiplicity distribution constrained to reproduce the data, does not adequately distinguish among models with widely varying cluster sizes.

T. Ludlam; R. Slansky

1975-01-01

243

Mobile Router Technology Development  

NASA Technical Reports Server (NTRS)

Cisco Systems and NASA have been performing joint research on mobile routing technology under a NASA Space Act Agreement. Cisco developed mobile router technology and provided that technology to NASA for applications to aeronautic and space-based missions. NASA has performed stringent performance testing of the mobile router, including the interaction of routing and transport-level protocols. This paper describes mobile routing, the mobile router, and some key configuration parameters. In addition, the paper describes the mobile routing test network and test results documenting the performance of transport protocols in dynamic routing environments.

Ivancic, William D.; Stewart, David H.; Bell, Terry L.; Kachmar, Brian A.; Shell, Dan; Leung, Kent

2002-01-01

244

Novel shock absorber features varying yield strengths  

NASA Technical Reports Server (NTRS)

A shock absorbent webbing of partially drawn synthetic strands is arranged in sections of varying density related to the varying mass of the human body. This is contoured to protect the body at points of contact, when subjected to large acceleration or deceleration forces.

Geier, D. J.

1964-01-01

245

Fractal analysis of time varying data  

DOEpatents

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.

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

2002-01-01

246

1. Introduction Rapid advances in mobile computing devices and sensor  

E-print Network

receiver, accelerometer, compass, skin conductance sensors, heart rate monitors etc. The user captures data. Watson Research Center 19 Skyline Drive Hawthorne, NY 10532 GPS Compass Microphone Camera Video Analytics, etc Location Events (At Junction X Speed Direction) Audio / Speech Events (Explosion, Speech

Zhu, Zhigang

247

Published in MobiSys'11: Proceedings of the 9th International Conference on Mobile Systems, Applications, and Services, June/July 2011. Security versus Energy Tradeoffs in  

E-print Network

, Applications, and Services, June/July 2011. Security versus Energy Tradeoffs in Host-Based Mobile Malware@cs.rutgers.edu ABSTRACT 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, caus- ing users

Ganapathy, Vinod

248

Mobile Agents and Java Mobile Agents Toolkits  

Microsoft Academic Search

This paper gives an overview of what the mobile agents are, what they should do and how they can be implemented in Java. Why Java? The choice to concentrate on Java is evoked by many existing solutions in Java that handles architectural heterogeneity between communicating machines on the net. It seems to be the best available language for making mobile

Damir Horvat; Dragana Cvetkovi?; Veljko Milutinovi?; Petar Ko?ovi?; Vlada Kova?evi?

2001-01-01

249

Gone Mobile? (Mobile Libraries Survey 2010)  

ERIC Educational Resources Information Center

Librarians, like patrons and researchers, are caught between traditional library service models and the promise of evolving information technologies. In recent years, professional conferences have strategically featured programs and presentations geared toward building a mobile agenda and adapting or adopting services to meet new demands of mobile

Thomas, Lisa Carlucci

2010-01-01

250

ECG R-R peak detection on mobile phones.  

PubMed

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

Sufi, F; Fang, Q; Cosic, I

2007-01-01

251

Analyzing and geo-visualizing individual human mobility patterns using mobile call records  

Microsoft Academic Search

Understanding the dynamics of the individuals' daily mobility patterns is very important in a wide range of fields. However, lacking of tools to monitor the time-resolved location of individuals makes this research consume both tremendous time and money in the past. Nowadays, the rapidly developing ability to collect space-time activity (STA) data through new information technologies such as cellular phones,

Chaogui Kang; Song Gao; Xing Lin; Yu Xiao; Yihong Yuan; Yu Liu; Xiujun Ma

2010-01-01

252

Tandem mobile robot system  

DOEpatents

A robotic vehicle system for terrain navigation mobility provides a way to climb stairs, cross crevices, and navigate across difficult terrain by coupling two or more mobile robots with a coupling device and controlling the robots cooperatively in tandem.

Buttz, James H. (Albuquerque, NM); Shirey, David L. (Albuquerque, NM); Hayward, David R. (Albuquerque, NM)

2003-01-01

253

Understanding Mobile Apps  

MedlinePLUS

... a smart phone or another mobile device with internet access. Not all apps work on all mobile devices. ... wireless network, you'll need to pay for internet access and a wireless router, and you’ll want ...

254

Third International Workshop on Ion Mobility Spectrometry  

NASA Technical Reports Server (NTRS)

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.

Cross, John H. (editor)

1995-01-01

255

Integrated Personal Mobility Architecture: A Complete Personal Mobility Solution  

Microsoft Academic Search

The high expectations and demand for users to access the Internet from anywhere at anytime has made user mobility an important part of the design and development of the next generation mobile communications and computing. Traditionally user mobility has been divided into two areas: Terminal Mobility and Personal Mobility. In recent years terminal mobility has focused on the movement of

Binh Thai; Rachel Wan; Aruna Seneviratne; Thierry Rakotoarivelo

2003-01-01

256

Mobility management for all-IP mobile networks: mobile IPv6 vs. proxy mobile IPv6  

Microsoft Academic Search

Recently, a network-based mobility management protocol called Proxy Mobile IPv6 (PMIPv6) is being actively standardized by the IETF NETLMM working group, and is starting to attract considerable attention among the telecommunication and Internet communities. Unlike the various existing protocols for IP mobility management such as Mobile IPv6 (MIPv6), which are host-based approaches, a network-based approach such as PMIPv6 has salient

Ki-Sik Kong; Wonjun Lee; Youn-Hee Han; Myung-Ki Shin; HeungRyeol You

2008-01-01

257

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

E-print Network

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

Komatitsch, Dimitri

258

Satellite Observations of Rapidly Varying Cosmic X-ray Sources. Ph.D. Thesis - Catholic Univ.  

NASA Technical Reports Server (NTRS)

The X-ray source data obtained with the high energy celestial X-ray detector on the Orbiting Solar Observatory -8 are presented. The results from the 1977 Crab observation show nonstatistical fluctuations in the pulsed emission and in the structure of the integrated pulse profile which cannot be attributed to any known systematic effect. The Hercules observations presented here provide information on three different aspects of the pulsed X-ray emission: the variation of pulsed flux as a function of the time from the beginning of the ON-state, the variation of pulsed flux as a function of binary phase, and the energy spectrum of the pulse emission.

Maurer, G. S.

1979-01-01

259

Sound mobility models  

Microsoft Academic Search

Simulation has become an indispensable tool in the construction and evaluation of mobile systems. By using mobility models that describe constituent movement, one can explore large systems, producing repeatable results for comparison between alternatives. Unfortunately, the vast majority of mobility models---including all those in which nodal speed and distance or destination are chosen independently---suffer from decay; average speed decreases until

Jungkeun Yoon; Mingyan Liu; Brian Noble

2003-01-01

260

Mobile Student Information System  

ERIC Educational Resources Information Center

Purpose: A mobile student information system (MSIS) based on mobile computing and context-aware application concepts can provide more user-centric information services to students. The purpose of this paper is to describe a system for providing relevant information to students on a mobile platform. Design/methodology/approach: The research…

Asif, Muhammad; Krogstie, John

2011-01-01

261

MOBILE IDENTITY MANAGEMENT  

Microsoft Academic Search

In this paper we review the state-of-the-art in Mobile Identity Management and discuss its implications for the emerging ubiquitous computing systems. We start by establishing the concept of identity in the digital context and then proceed to discuss the emerging field of digital identity and mobility. We identify the benefits of mobile identity management both for the consumer and for

George Roussos; Uma Patel

262

Mobile and ubiquitous malware  

Microsoft Academic Search

Mobile malware is an increasing threat to the world of handheld devices, which can prove to be costlier than PC viruses in the future. The current method used to combat mobile malware is virus signature matching which is based on the slow process of reverse engineering. This paper studies the growth, spread and generic behaviors of mobile and ubiquitous malware

Yean Li Ho; Swee-Huay Heng

2009-01-01

263

Towards Mobile Cryptography  

Microsoft Academic Search

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

Tomas Sander; Christian F. Tschudin

1998-01-01

264

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

PubMed

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

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

265

PI and PIF based mobilizer  

Microsoft Academic Search

This paper introduces a novel method, called the mobilizer, of executing synchronous communication protocols in a cellular mobile environment. First, we present a distributed protocol, called mobile propagation of information (MPI), for broadcasting over a mobile environment. Then, we present the mobile propagation of information with feedback (MPIF) protocol, which can be used to implement this mobilizer, that is, enable

B. Mizrachi; I. Cidon; M. Sidi

1998-01-01

266

Efficient Estimation of Spatially Varying Subsurface Scattering Parameters for Relighting  

E-print Network

We present an image-based technique to rapidly acquire spatially varying subsurface reflectance properties of a human face. The estimated properties can be used directly to render faces with spatially varying scattering, or can be used to estimate a robust average across the face. We demonstrate our technique with renderings of peoples ’ faces under novel, spatially-varying illumination and provide comparisons with current techniques. Our captured data consists of images of the face from a single viewpoint under two small sets of projected images. The first set, a sequence of phase shifted periodic stripe patterns, provides a per-pixel profile of how light scatters from adjacent locations. The second set contains structured light and is used to obtain face geometry. We match the observed reflectance profiles to scattering properties predicted by a scattering model using a lookup table. From these properties we can generate images of the face under any incident illumination, including local lighting. The rendered images exhibit realistic subsurface transport, including light bleeding across shadow edges. Our method works more than an order of magnitude faster than current techniques for capturing subsurface scattering information, and makes it possible for the first time to capture these properties over an entire face.

Sarah Tariq; Andrew Gardner; Ignacio Llamas; Andrew Jones; Paul Debevec; Greg Turk

2006-01-01

267

Mobile Virtual Private Networking  

NASA Astrophysics Data System (ADS)

Mobile Virtual Private Networking (VPN) solutions based on the Internet Security Protocol (IPSec), Transport Layer Security/Secure Socket Layer (SSL/TLS), Secure Shell (SSH), 3G/GPRS cellular networks, Mobile IP, and the presently experimental Host Identity Protocol (HIP) are described, compared and evaluated. Mobile VPN solutions based on HIP are recommended for future networking because of superior processing efficiency and network capacity demand features. Mobile VPN implementation issues associated with the IP protocol versions IPv4 and IPv6 are also evaluated. Mobile VPN implementation experiences are presented and discussed.

Pulkkis, Göran; Grahn, Kaj; Mårtens, Mathias; Mattsson, Jonny

268

Mobile phone users attitude towards Mobile Commerce (m-commerce) and Mobile Services in Oman  

Microsoft Academic Search

As the number of mobile phone users is growing, purchasing products and services using mobile phones and other mobile devices are also increasing. The purpose of this study was to provide the status of m-commerce in Oman in term of consumers' attitudes towards mobile commerce and mobile services provided by mobile operators in Oman. The study showed that there is

Naser-Nick Manochehri; Y. AlHinai

2006-01-01

269

As part of its continuing cloud computing series, the National Institute of Standards and Technology is hosting a new forum on Cloud and Mobility. Join experts in the fields of cloud, mobility, and measurement for thought-provoking  

E-print Network

As part of its continuing cloud computing series, the National Institute of Standards and Technology is hosting a new forum on Cloud and Mobility. Join experts in the fields of cloud, mobility sessions, and networking. New Frontiers in IT and Measurement Science Rapid advances in mobile cloud

270

Rapid fabrication of microcomponents  

NASA Astrophysics Data System (ADS)

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.

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

2000-04-01

271

Composite Social Network for Predicting Mobile Apps Installation Wei Pan and Nadav Aharony and Alex (Sandy) Pentland  

E-print Network

Composite Social Network for Predicting Mobile Apps Installation Wei Pan and Nadav Aharony and Alex of predicting mobile application (known as "apps") installation using social networks and explain its challenge applications (referred as "apps") installation, as the mobile application business is growing rapidly (Elli

272

Reconfigurable mobile manipulation for accident response  

SciTech Connect

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.

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

2000-06-06

273

The Use of Light Rail or Light Rapid Transit Systems by Individuals with Severe Visual Impairments.  

ERIC Educational Resources Information Center

This study investigated the relationship between use of light rapid or light rail transit (LRT) systems by persons with severe visual impairments and independence in orientation and mobility. It found that orientation and mobility training on LRT systems would resolve many of the difficulties that users encountered. Modifications to improve…

Svendsen, K.

1994-01-01

274

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

Microsoft Academic Search

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

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

2008-01-01

275

Quality of service guarantees in mobile computing  

Microsoft Academic Search

With rapid technological advances being made in the area of wireless communications it is expectedthat, in the near future, mobile users will be able to access a wide variety of services that will bemade available over future high-speed networks. The quality of these services in the high-speed networkdomain can be specified in terms of several QOS parameters.In this paper we

Suresh Singh

1996-01-01

276

Time-Varying MIMO Channels: Parametric Statistical Modeling and Experimental Results  

Microsoft Academic Search

Accurate characterization of multiple-input multiple-output (MIMO) fading channels is an important prerequisite for the design of multi-antenna wireless communication systems. In this paper, a single-bounce two-ring statistical model for time-varying MIMO flat fading channels is proposed. In the m odel, both the base and mobile stations are surrounded by their own ring of scatterers. For the proposed model, a closed-form

Shuangquan Wang; Ali Abdi; Jari Salo; Hassan M. El-Sallabi; Jon W. Wallace; Pertti Vainikainen; Michael A. Jensen

2005-01-01

277

Transport of Brownian particles in a narrow, slowly-varying serpentine channel  

E-print Network

We study the transport of Brownian particles under a constant driving force and moving in channels that present a varying centerline but have constant aperture width. We investigate two types of channels, {\\it solid} channels in which the particles are geometrically confined between walls and {\\em soft} channels in which the particles are confined by a periodic potential. We consider the limit of narrow, slowly-varying channels, i.e., when the aperture and the variation in the position of the centerline are small compared to the length of a unit cell in the channel (wavelength). We use the method of asymptotic expansions to determine both the average velocity (or mobility) and the effective diffusion coefficient of the particles. We show that both solid and soft-channels have the same effects on the transport properties up to $O(\\epsilon^2)$. We also show that the mobility in a solid-channel at $O(\\epsilon^4)$ is smaller than that in a soft-channel. Interestingly, in both cases, the corrections to the mobility of the particles are independent of the P\\'eclet number and, as a result, the Einstein-Smoluchowski relation is satisfied. Finally, we show that by increasing the solid-channel width from $w(x)$ to $\\sqrt{6/\\pi}w(x)$, the mobility of the particles in the solid-channel can be matched to that in the soft-channel up to $O(\\epsilon^4)$.

X. Wang; G. Drazer

2014-06-12

278

Antenna Design for Mobile MIMO Systems  

Microsoft Academic Search

SUMMARY While significant work has been dedicated to analyzing the performance of antennas for multiple-input multiple-output (MIMO) and diversity systems, little has appeared on synthesizing optimal anten- nas for these systems. This paper explores optimal antenna characteristics given understanding about the average structure of the propagation envi- ronment, making the results applicable for time-varying channels created by mobile nodes or

Michael A. Jensen; Britton Quist; Nicolas W. Bikhazi

2008-01-01

279

Frequency domain feed-forward filter combined DFE structure in single carrier systems over time-varying channels  

Microsoft Academic Search

Most of the researches about frequency domain equalization assume that the single carrier wireless communication system works over static channels. However, with more and more requests for mobile wireless reception, we have to consider the case of time-varying channels. In this paper, we propose a frequency domain feed-forward filter combined decision feedback equalizer over time-varying channels (FD-DFE-TV) for single carrier

Bo Liu; Lin Gui; Wenjun Zhang; Jian Xiong

2008-01-01

280

Rapid Solidification of Magnetic Oxides  

NASA Technical Reports Server (NTRS)

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.

Kalonji, G.; Deguire, M. R.

1985-01-01

281

The appealing characteristics of download type mobile games  

Microsoft Academic Search

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

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

2010-01-01

282

Rapid Prototyping Reconsidered  

ERIC Educational Resources Information Center

Continuing educators need additional strategies for developing new programming that can both reduce the time to market and lower the cost of development. Rapid prototyping, a time-compression technique adapted from the high technology industry, represents one such strategy that merits renewed evaluation. Although in higher education rapid

Desrosier, James

2011-01-01

283

California rapid assessment method  

E-print Network

standardized, cost- effective tools for land use planning and project evaluation. A rapid assessment method are used to evaluate the general condition of wetlands using field indicators. These methods provideCalifornia rapid assessment method Cram www.cramwetlands.org For further questions, email cram

284

MobilityFirst: A Robust and Trustworthy Mobility-Centric  

E-print Network

: Near-term "mobile Internet" usage scenario ­ Mobile P2P and Infostations P2P and Infostations (DTN and opportunistic data delivery Mobile DTN Router Roadway Sensors Mobile DTN User/Router Ad-Hoc Network Opportunistic access Message ferry/DTN Content delivery/cache #12;WINLAB Vision: Future "mobile Internet" usage

285

Mobility modeling in third-generation mobile telecommunications systems  

Microsoft Academic Search

In mobile communications, mobility modeling is involved in several aspects related to signaling and traffic load analysis. In third-generation systems, the influence of mobility on the network performance (e.g., handover rate) will be strengthened, mainly due to the huge number of mobile users in conjunction with the small cell size. In particular, the accuracy of mobility models becomes essential for

J. G. Markoulidakis; G. L. Lyberopoulos; D. F. Tsirkas; E. D. Sykas

1997-01-01

286

On fundamental concept of mobility for mobile communications  

Microsoft Academic Search

The tremendous demands from the social market are pushing the booming development of mobile communications faster than ever before, leading to the emergence of many new advanced techniques. Mobile communications are changing life styles in many ways. Behind the scenario, the outstanding characteristic that makes this reality is mobility. The paper studies the basic concepts of mobility for mobile communications,

Jun-Zhao Sun; Jaakko Sauvola

2002-01-01

287

Cellular calcium mobilization  

SciTech Connect

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.

Daniel, E.E.

1984-01-01

288

What Can We Learn about Inflation Targeting? Evidence from Time-Varying Treatment Effects  

E-print Network

What Can We Learn about Inflation Targeting? Evidence from Time-Varying Treatment Effects Wen of Economics Feng Chia University Abstract Recent studies that evaluate inflation targeting through average, developed countries lower inflation and reach their targets rapidly in two years and developing countries

Ahmad, Sajjad

289

TIME VARYING PARAMETERS IN THE DEMAND FOR HIGH FRUCTOSE CORN SYRUP  

Microsoft Academic Search

Rapid adoption of high fructose corn syrup and the changing demand for HFCS is measured in a time-varying framework. Demand changes are separated into structural and price competitiveness. Tests for parameter stability are made and simulations based on the estimates are used to show the industry dynamics.

Edward A. Evans; Ronald W. Ward; Carlton George Davis

2001-01-01

290

ACTS mobile SATCOM experiments  

NASA Technical Reports Server (NTRS)

Over the last decade, the demand for reliable mobile satellite communications (satcom) for voice, data, and video applications has increased dramatically. As consumer demand grows, the current spectrum allocation at L-band could become saturated. For this reason, NASA and the Jet Propulsion Laboratory are developing the Advanced Communications Technology Satellites (ACTS) mobile terminal (AMT) and are evaluating the feasibility of K/Ka-band (20/30 GHz) mobile satcom to meet these growing needs. U.S. industry and government, acting as co-partners, will evaluate K/Ka-band mobile satcom and develop new technologies by conducting a series of applications-oriented experiments. The ACTS and the AMT testbed will be used to conduct these mobile satcom experiments. The goals of the ACTS Mobile Experiments Program and the individual experiment configurations and objectives are further presented.

Abbe, Brian S.; Frye, Robert E.; Jedrey, Thomas C.

1993-01-01

291

Research on the key technologies of mobile digital maps  

NASA Astrophysics Data System (ADS)

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.

Ji, Cuiling; Xiao, Yongkang; Chi, Tianhe

2006-10-01

292

Mobility and Identity  

Microsoft Academic Search

While identity management systems for the Internet are debated intensively, identity management in mobile applications has\\u000a grown silently over the last 17 years. Technologies, such as the still-growing Global System for Mobile Communication (GSM)\\u000a with its Subscriber Identity Module (SIM) identification infrastructure, are foundations for many new mobile identity management\\u000a related applications and services. This includes location-based services (LBS), offering

Denis Royer; André Deuker; Kai Rannenberg

293

Mobile learning in medicine  

NASA Astrophysics Data System (ADS)

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.

Serkan Güllüoü?lu, Sabri

2013-03-01

294

Human organisms in varying gravicondition on Earth  

Microsoft Academic Search

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

G. Kochemasov

2002-01-01

295

Methods of Recording Rapid Wind Changes  

NASA Technical Reports Server (NTRS)

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.

Magnan, A

1932-01-01

296

Curb Mounting, Vertical Mobility, and Inverted Mobility on Rough Surfaces Using Microspine-Enabled Robots  

NASA Technical Reports Server (NTRS)

Three robots that extend microspine technology to enable advanced mobility are presented. First, the Durable Reconnaissance and Observation Platform (DROP) and the ReconRobotics Scout platform use a new rotary configuration of microspines to provide improved soldier-portable reconnaissance by moving rapidly over curbs and obstacles, transitioning from horizontal to vertical surfaces, climbing rough walls and surviving impacts. Next, the four-legged LEMUR robot uses new configurations of opposed microspines to anchor to both manmade and natural rough surfaces. Using these anchors as feet enables mobility in unstructured environments, from urban disaster areas to deserts and caves.

Parness, Aaron

2012-01-01

297

The Varied Uses of Readability Measurement.  

ERIC Educational Resources Information Center

Readability formulas have varied uses. In education they are used to match children's reading ability to the difficulty level of material, select stories and books for classroom use and for individual students' particular needs, select textbooks and other reading materials, aid educational research, and check reading materials of newly literate…

Fry, Edward

298

Time-varying joint distribution through copulas  

Microsoft Academic Search

This paper deals with the analysis of temporal dependence in multivariate time series. The dependence structure between the marginal series is modelled through the use of copulas which, unlike the correlation matrix, give a complete description of the joint distribution. The param- eters of the copula function vary through time following certain evolution equations depending on their previous values and

M. Concepcion Ausin; Hedibert F. Lopes

2010-01-01

299

Relaxation Assessment with Varied Structured Milieu (RELAX).  

ERIC Educational Resources Information Center

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)

Cassel, Russell N.; Cassel, Susie L.

1983-01-01

300

Venturi Tube with Varying Mass Flow  

NASA Technical Reports Server (NTRS)

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.

Regenscheit, B.

1948-01-01

301

Adaptive Template Moderated Spatially Varying Statistical Classification  

Microsoft Academic Search

A novel image segmentation algorithm was developed to allow the automatic segmentation of both normal and abnormal anatomy. The new algo- rithm is a form of spatially varying classification (SVC), in which an explicit anatomical template is used to moderate the segmentation obtained by k Nearest Neighbour ( -NN) statistical classification. The new algorithm consist s of an iter- ated

Simon K. Warfield; Michael Kaus; Ferenc A. Jolesz; Ron Kikinis

1998-01-01

302

Time-Varying World Market Integration  

Microsoft Academic Search

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

Geert Bekaert; Campbell R Harvey

1995-01-01

303

INVESTIGATION The Genetic Consequences of Spatially Varying  

E-print Network

a stable polymorphic equilibrium at these loci. Our results suggest that some geneticINVESTIGATION The Genetic Consequences of Spatially Varying Selection in the Panmictic American Eel-8000 Aarhus C, Denmark ABSTRACT Our understanding of the genetic basis of local adaptation has recently

Bernatchez, Louis

304

Boiling Radial Flow in Fractures of Varying  

E-print Network

SGP-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 differences in boiling regimes and behavior, and attempted to quantify a boiling convection coefficient

Stanford University

305

Democratizing digital content creation using mobile devices with inbuilt sensors.  

PubMed

The merging of ever-burgeoning computing facilities and a variety of useful input and sensing devices is revolutionizing the paradigm of ubiquitous computing. Digital content creation applications previously dominant only on desktop computers are rapidly emerging on mobile computing platforms in response to the ongoing additions of inbuilt sensors on mobile devices. Specifically, mobile content creation has become more viable as a result of improvements in raw and graphical processing speeds, storage capacity, interaction techniques, and networking speeds. However, many fundamental challenges remain to be investigated to provide a more natural experience to both casual and professional content creators. This article introduces mobile content creation and then provides an overview of the current state of the art in the use of inbuilt sensors and input devices in a typical content production activity. Major challenges and future directions of using mobile devices with inbuilt sensors for digital content creation are presented as well. PMID:25666602

Dev, Kapil; Lau, Manfred

2015-01-01

306

Doctors going mobile.  

PubMed

Having a Web page and a blog site are the minimum requirements for an Internet presence in the new millennium. However, a Web page that loads on a personal computer or a laptop will be ineffective on a mobile or cellular phone. Today, with more existing and potential patients having access to cellular technology, it is necessary to reconfigure the appearance of your Web site that appears on a mobile phone. This article discusses mobile computing and suggestions for improving the appearance of your Web site on a mobile or cellular phone. PMID:25807610

Romano, Ron; Baum, Neil

2014-01-01

307

Control of Mobile Communication Systems with Time-Varying Channels via Stability Methods  

E-print Network

fairness and queue lengths. The various extensions allow a large variety of schemes of This work traffic approximation when the controllable part of the power is small is in [4]. 1 Introduction We arrivals minus its departures to date. Time is divided into small scheduling intervals of length

308

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

E-print Network

transports with fixed timetables, low earth orbiting (LEO) satellite systems, security guards' tours, etc unbounded O(m) O(n2 ) O(m) O(n) B n O(n) O(m) O(n2 ) O(m) O(n) O(n) O(m) O(n) O(m) 0 n& O(n) O(m) 0 O(m) 0 Shortest B O(n) O(m) O(n) : 2n - 2 O(n) 0 either of { n& O(n) O(m) O(n) : n - 1 O(n) 0 n& O(n) O(m) 0 O(m

Boyer, Edmond

309

Mobile Phone Dermatitis in Children and Adults: A Review of the Literature  

PubMed Central

Background: Mobile phones have been reported to cause allergic contact dermatitis (ACD). Methods: A comprehensive online literature review was conducted through the National Library of Medicine (Pubmed MEDLINE) using appropriate medical subject headings and keywords. Results: Thirty-seven cases of mobile phone-related ACD were found. Six studies evaluating allergen release from mobile phones were found. Conclusions: Case reports of mobile phone-associated ACD have risen rapidly in number since 2000. Case reports highlight mobile phone ACD in both pediatric and adult populations in many countries. Metal allergens, notably nickel and chromium, were frequently implicated in mobile phone associated ACD. Nickel release from mobile phones appears to be common and has been reported in both cheap and expensive mobile phones, including phones covered under the EU Nickel Directive. PMID:24963454

Richardson, Clare; Hamann, Dathan; Thyssen, Jacob P.

2014-01-01

310

Distinct but phenotypically heterogeneous human cell populations produce rapid recovery of platelets and neutrophils after transplantation.  

PubMed

Delayed recovery of mature blood cells poses a serious, expensive, and often life-threatening problem for many stem cell transplantation recipients, particularly if heavily pretreated and serving as their own donor, or having a CB transplantation as the only therapeutic option. Importantly, the different cells required to ensure a rapid, as well as a permanent, hematopoietic recovery in these patients remain poorly defined. We now show that human CB and mobilized peripheral blood (mPB) collections contain cells that produce platelets and neutrophils within 3 weeks after being transplanted into sublethally irradiated NOD/scid-IL-2R?c-null mice. The cells responsible for these 2 outputs are similarly distributed between the aldehyde dehydrogenase-positive and -negative subsets of lineage marker-negative CB and mPB cells, but their overall frequencies vary independently in individual samples. In addition, their total numbers can be seen to be much (> 30-fold) lower in a single "average" CB transplantation compared with a single "average" mPB transplantation (normalized for a similar weight of the recipient), consistent with the published differential performance in adult patients of these 2 transplantation products. Experimental testing confirmed the clinical relevance of the surrogate xenotransplantation assay for quantifying cells with rapid platelet regenerative activity, underscoring its potential for future applications. PMID:22374695

Cheung, Alice M S; Leung, Donna; Rostamirad, Shabnam; Dhillon, Kiran; Miller, Paul H; Droumeva, Radina; Brinkman, Ryan R; Hogge, Donna; Roy, Denis Claude; Eaves, Connie J

2012-04-12

311

Survey on network mobility support  

Microsoft Academic Search

Providing unperturbed Internet connectivity to mobile hosts has been studied in the IETF for some years now, and protocols such as Mobile IP and Mobile IPv6 have been developed. We are now witnessing the emergence of mobile networks, namely a set of hosts that move collectively as a unit, such as on ships and aircrafts. The protocols for mobility support

Eranga Perera; Vijay Sivaraman; Aruna Seneviratne

2004-01-01

312

Data Management for Mobile Computing  

Microsoft Academic Search

Introductionmobile or nomadic computingwirelessubiquitouspersonalArchitectureStationBaseStationBaseFixedHostMbps to GbpsMobileHostHostMobileWireless LAN cellMobileHost1 MbpsMobileHostFixed Network9 KbpsWireless radio cellBaseHostFixedStationFixedHostFixedHostWireless radio cellE. Pitoura - Summer School on Mobile Computing, Jyvaskyla, 1998 1\\

Evaggelia Pitoura; George Samaras

1998-01-01

313

Mobile Games Challenges and Opportunities  

Microsoft Academic Search

Mobile games are expected to play significant role in future mobile services by evolving beyond the largely single player titles that currently dominate the market to ones that take advantage expanding mobile phone functionality and the wide demographic of the mobile phone user. However, because of the fragmented nature of the mobile software development market, and the restrictions imposed by

Paul Coulton; Reuben Edwards; William Bamford; Fadi Chehimi; Paul Gilbertson; Omer Rashid

2007-01-01

314

Quantitative Imaging with a Mobile Phone Microscope  

PubMed Central

Use of optical imaging for medical and scientific applications requires accurate quantification of features such as object size, color, and brightness. High pixel density cameras available on modern mobile phones have made photography simple and convenient for consumer applications; however, the camera hardware and software that enables this simplicity can present a barrier to accurate quantification of image data. This issue is exacerbated by automated settings, proprietary image processing algorithms, rapid phone evolution, and the diversity of manufacturers. If mobile phone cameras are to live up to their potential to increase access to healthcare in low-resource settings, limitations of mobile phone–based imaging must be fully understood and addressed with procedures that minimize their effects on image quantification. Here we focus on microscopic optical imaging using a custom mobile phone microscope that is compatible with phones from multiple manufacturers. We demonstrate that quantitative microscopy with micron-scale spatial resolution can be carried out with multiple phones and that image linearity, distortion, and color can be corrected as needed. Using all versions of the iPhone and a selection of Android phones released between 2007 and 2012, we show that phones with greater than 5 MP are capable of nearly diffraction-limited resolution over a broad range of magnifications, including those relevant for single cell imaging. We find that automatic focus, exposure, and color gain standard on mobile phones can degrade image resolution and reduce accuracy of color capture if uncorrected, and we devise procedures to avoid these barriers to quantitative imaging. By accommodating the differences between mobile phone cameras and the scientific cameras, mobile phone microscopes can be reliably used to increase access to quantitative imaging for a variety of medical and scientific applications. PMID:24824072

Skandarajah, Arunan; Reber, Clay D.; Switz, Neil A.; Fletcher, Daniel A.

2014-01-01

315

Quantitative imaging with a mobile phone microscope.  

PubMed

Use of optical imaging for medical and scientific applications requires accurate quantification of features such as object size, color, and brightness. High pixel density cameras available on modern mobile phones have made photography simple and convenient for consumer applications; however, the camera hardware and software that enables this simplicity can present a barrier to accurate quantification of image data. This issue is exacerbated by automated settings, proprietary image processing algorithms, rapid phone evolution, and the diversity of manufacturers. If mobile phone cameras are to live up to their potential to increase access to healthcare in low-resource settings, limitations of mobile phone-based imaging must be fully understood and addressed with procedures that minimize their effects on image quantification. Here we focus on microscopic optical imaging using a custom mobile phone microscope that is compatible with phones from multiple manufacturers. We demonstrate that quantitative microscopy with micron-scale spatial resolution can be carried out with multiple phones and that image linearity, distortion, and color can be corrected as needed. Using all versions of the iPhone and a selection of Android phones released between 2007 and 2012, we show that phones with greater than 5 MP are capable of nearly diffraction-limited resolution over a broad range of magnifications, including those relevant for single cell imaging. We find that automatic focus, exposure, and color gain standard on mobile phones can degrade image resolution and reduce accuracy of color capture if uncorrected, and we devise procedures to avoid these barriers to quantitative imaging. By accommodating the differences between mobile phone cameras and the scientific cameras, mobile phone microscopes can be reliably used to increase access to quantitative imaging for a variety of medical and scientific applications. PMID:24824072

Skandarajah, Arunan; Reber, Clay D; Switz, Neil A; Fletcher, Daniel A

2014-01-01

316

Mobile medical device connectivity: real world solutions.  

PubMed

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

Pettus, Dan

2004-01-01

317

Rapidly Progressive Dementia  

PubMed Central

In contrast with more common dementing conditions that typically develop over years, rapidly progressive dementias can develop subacutely over months, weeks, or even days and be quickly fatal. Because many rapidly progressive dementias are treatable, it is paramount to evaluate and diagnose these patients quickly. This review summarizes recent advances in the understanding of the major categories of RPD and outlines efficient approaches to the diagnosis of the various neurodegenerative, toxic-metabolic, infectious, autoimmune, neoplastic, and other conditions that may progress rapidly. PMID:18668637

Geschwind, Michael D.; Shu, Huidy; Haman, Aissa; Sejvar, James J.; Miller, Bruce L.

2009-01-01

318

Rapid solidification processing  

NASA Technical Reports Server (NTRS)

Rapid solidification in materials was studied. Crystalline and noncrystalline metals, polymers, ceramics, solidification mechanism and resulting structure, innovative processing techniques, properties and applications are investigated. The following programs are outlined: alloys which offer high strength at elevated temperatures, and processing methods necessary to achieve these goals; structure and structure property relations in ferrous alloys; Corrosion related aspects and high temperature oxidation resistance of fine grained alloys; relation of solidification theory to structures produced, on innovative processes for rapid solidification, and on solidification at high undercoolings. Studies on rapid solidification of polymeric materials are demonstrated.

1982-01-01

319

Ion mobility analysis of lipoproteins  

DOEpatents

A medical diagnostic method and instrumentation system for analyzing noncovalently bonded agglomerated biological particles is described. The method and system comprises: a method of preparation for the biological particles; an electrospray generator; an alpha particle radiation source; a differential mobility analyzer; a particle counter; and data acquisition and analysis means. The medical device is useful for the assessment of human diseases, such as cardiac disease risk and hyperlipidemia, by rapid quantitative analysis of lipoprotein fraction densities. Initially, purification procedures are described to reduce an initial blood sample to an analytical input to the instrument. The measured sizes from the analytical sample are correlated with densities, resulting in a spectrum of lipoprotein densities. The lipoprotein density distribution can then be used to characterize cardiac and other lipid-related health risks.

Benner, W. Henry (Danville, CA); Krauss, Ronald M. (Berkeley, CA); Blanche, Patricia J. (Berkeley, CA)

2007-08-21

320

Subcortical amygdala pathways enable rapid face processing  

PubMed Central

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

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

2014-01-01

321

Quantitative experiences in bidirectional mobile to mobile audio & video streaming  

Microsoft Academic Search

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

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

2007-01-01

322

Client Mobile Software Design Principles for Mobile Learning Systems  

Microsoft Academic Search

Abstract—In a client-server mobile learning system, client mobile software must run on the mobile phone to acquire, package, and send student’s interaction data via the mobile communications network to the ,connected mobile application server. The server will receive and process the client data in order to offer appropriate content and learning activities. To develop the mobile learning systems there are

Qing Tan; Kinshuk Kinshuk

2009-01-01

323

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

E-print Network

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.

Paul, Bijan; Bikas, Md Abu Naser

2012-01-01

324

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

E-print Network

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.

Paul, Bijan; Bikas, Md Abu Naser

2012-01-01

325

Columbia University Varying Electron Cyclotron ResonanceVarying Electron Cyclotron Resonance  

E-print Network

Columbia University Varying Electron Cyclotron ResonanceVarying Electron Cyclotron Resonance currently via two electron cyclotron resonance heating (ECRH) sources: 2.5 kW at 2.45 GHz and 2.5 kW at 6 discharge can be used to turn plasma instabilities on and off. #12;OutlineOutline Electron cyclotron

326

System for rapid subtitling  

E-print Network

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, ...

Leonard, Sean Joseph

2005-01-01

327

RAPID and DDS  

NASA Technical Reports Server (NTRS)

This talk gives an overview of the the Robot Applications Programmers Interface Delegate (RAPID) as well as the distributed systems middleware Data Distribution Service (DDS). DDS is an open software standard, RAPID is cleared for open-source release under NOSA. RAPID specifies data-structures and semantics for high-level telemetry published by NASA robotic software. These data-structures are supported by multiple robotic platforms at Johnson Space Center (JSC), Jet Propulsion Laboratory (JPL) and Ames Research Center (ARC), providing high-level interoperability between those platforms. DDS is used as the middleware for data transfer. The feature set of the middleware heavily influences the design decision made in the RAPID specification. So it is appropriate to discuss both in this introductory talk.

Utz, Hans Heinrich

2011-01-01

328

The Thermal Collector With Varied Glass Covers  

SciTech Connect

The thermal collector with varied glass covers represents an innovation realized in order to build a collector able to reach the desired temperature by collecting the solar radiation from the smallest surface, with the highest efficiency. In the case of the thermal collector with variable cover glasses, the number of the glass plates covering the absorber increases together with the length of the circulation pipe for the working fluid. The thermal collector with varied glass covers compared to the conventional collector better meet user requirements because: for the same temperature increase, has the collecting area smaller; for the same collection area, realizes the highest temperature increase and has the highest efficiency. This works is addressed to researchers in the solar energy and to engineers responsible with air-conditioning systems design or industrial and agricultural products drying.

Luminosu, I.; Pop, N. [Department of Physical Foundation of Engineering, 'Politehnica' University of Timisoara, B-dul V. Parvan, No. 2, Timisoara, 300223 (Romania)

2010-08-04

329

The Thermal Collector With Varied Glass Covers  

NASA Astrophysics Data System (ADS)

The thermal collector with varied glass covers represents an innovation realized in order to build a collector able to reach the desired temperature by collecting the solar radiation from the smallest surface, with the highest efficiency. In the case of the thermal collector with variable cover glasses, the number of the glass plates covering the absorber increases together with the length of the circulation pipe for the working fluid. The thermal collector with varied glass covers compared to the conventional collector better meet user requirements because: for the same temperature increase, has the collecting area smaller; for the same collection area, realizes the highest temperature increase and has the highest efficiency. This works is addressed to researchers in the solar energy and to engineers responsible with air-conditioning systems design or industrial and agricultural products drying.

Luminosu, I.; Pop, N.

2010-08-01

330

Varying potential silicon carbide gas sensor  

NASA Technical Reports Server (NTRS)

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.

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

1997-01-01

331

Black Hole Censorship of Varying Fundamental Constants  

E-print Network

Here it is shown that the variation in the fine structure constant measured by Webb et al. matches the theoretically derived value for the maximum variation in the electronic charge permitted by the Generalized Second Law of Thermodynamics for black holes accreting and emitting in the present cosmic microwave background. It is postulated that the constants of nature, independently or dependently, vary at the maximal rate allowed by the Generalized Second Law of Thermodynamics.

Jane H MacGibbon

2006-04-04

332

Human response to varying concentrations of toluene  

Microsoft Academic Search

Summary  Thirty two males and 39 females aged 31–50 were exposed for 7 h to one of the three following conditions: (1) Clean air, (2)\\u000a constant exposure to 100 ppm toluene, or (3) a varying exposure with the same time-weighted average, but with peaks of 300\\u000a ppm every 30 min. During exposure the subjects exercised in three 15-min periods with a

Jesper Bælum; Gunnar R. Lundgvist; Lars Mølhave; Niels Trolle Andersen

1990-01-01

333

Types for mobile ambients  

Microsoft Academic Search

Java has demonstrated the utility of type systems for mobile code, and in particular their use and implications for security. Se- curity properties rest on the fact that a well-typed Java program (or the corresponding verified bytecode) cannot cause certain kinds of damage. In this paper we provide a type system for mobile computa- tion, that is, for computation that

Luca Cardelli; Andrew D. Gordon

1999-01-01

334

Mobility control agent  

SciTech Connect

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.

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

1983-05-17

335

Mobile Apps Style Guide  

Cancer.gov

National Cancer Instit?te U.S. DEPARTMENT OF HEALTH AND HUMAN SERVICES National Instit?tes of Health NCI Mobile Apps St?le Guide Version 1.0 Table of Contents 2 01. Mobile 01.1 Branding: Iconograph? 01.2 Branding: Logo Usage 01.3 Branding: Backgrounds 01.4

336

SantanderMobility Scholarships  

E-print Network

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

Anderson, Jim

337

Improving mobile internet usability  

Microsoft Academic Search

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

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

2001-01-01

338

Smart Mobility Dutch Automotive  

E-print Network

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

Franssen, Michael

339

Robotics vehicle mobility study  

NASA Astrophysics Data System (ADS)

A nine-month study was conducted under the direction of Tank-Automotive Research, Development and Engineering Center (TARDEC) in Warren, MI. to determine the best platform design for inherent all-terrain mobility of an unmanned robotic vehicle in the 15000-2500 lb. range. Reference platforms were the DEMO III 4x4 and the Utah State University 6x6 with omni-directional wheels. The study systematically developed desired top- down design-driving capabilities, operational needs, and mobility concepts supported by extensive analysis using the NATO Reference Mobility Model and literature searches. Maximizing mobility over all terrain and resisting immobilization were emphasized in order to minimize sensor computational burdens while maximizing the probability of timely mission accomplishment. Several wheeled, tracked and hybrid platform concepts were evaluated. Significant improvements in cross- country mobility, obstacle negotiation and self-extraction capability were achieved with hybrid solutions. Final concept development focused on an 8x8 swiveling wheeled platform with band track overlays. Conclusions of the study were: a technology demonstrator platform should be built for mobility validation and NRMM II refinemment; a robotic- vehicle-specific NRMM II mobility scenario should be developed; and sensor solutions for unmanned mobility platforms should be revisited.

Ansorge, Kurt H.; Pond, James E.

2000-07-01

340

Mobile application pricing  

Microsoft Academic Search

â–º Mobile app markets have become established with contractual restrictions. â–º When mobile platforms are a durable good, equilibrium price is zero. â–º Platforms earn profits from a share of app revenues. â–º To improve profits, platforms act to constrain app pricing. â–º Mechanisms include most favored customer clauses.

Joshua S. Gans

2012-01-01

341

Abstractions for Mobile Computation  

Microsoft Academic Search

We discuss the difficulties caused by mobile computing and mobile com- putation over wide area networks. We propose a unified framework for overcoming such difficulties. • (A) Virtual locations. Because of the presence of potential attackers, barriers are erected between mutually distrustful administrative domains. Therefore, a program must be aware of where it is, and of how to move or

Luca Cardelli

1999-01-01

342

Mobile medical image retrieval  

Microsoft Academic Search

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

Samuel Duc; Adrien Depeursinge; Ivan Eggel; Henning Müller

2011-01-01

343

NISTIR 7617 Mobile Forensic  

E-print Network

NISTIR 7617 Mobile Forensic Reference Materials: AMethodologyandReification WayneJansen AurélienDelaitre i #12;Mobile Forensic Reference Materials: A Methodology and Reification Wayne Jansen Aurélien of forensic tools. It describes an application and data set developed to populate identity modules

344

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:

345

Embodied mobile agents  

Microsoft Academic Search

The move in many societies toward individuals having multiple networked computational devices - workstations, notebooks computers, mobile phones, PDAs - radically changes the ways in which people engage those devices. However, we lack interaction paradigms that enable a coherent experience across these technologies. One possible approach to this problem involves the use of embodied mobile agents (EMAs), that is, graphically

Bill Tomlinson; Man Lok Yau; Eric Baumer

2006-01-01

346

MOBILE AGENTS AND SECURITY  

Microsoft Academic Search

Mobile agent technology offers a new computing paradigm in which a software agent can suspend its execution on a host computer, transfer itself to another agent-enabled host on the network, and resume execution on the new host. The use of mobile code has a long history dating back to the use of remote job entry systems in the 1960's. Today's

W. A. Jansen

1999-01-01

347

Mobile Learning Anytime, Anywhere  

ERIC Educational Resources Information Center

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…

Hlodan, Oksana

2010-01-01

348

Mobile Apps for Librarians  

ERIC Educational Resources Information Center

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,…

Power, June L.

2013-01-01

349

"Mobile money" services permit  

E-print Network

"Mobile money" services permit cell phone users to send small amounts of money via text message to their friends and relatives. There are over 90 mobile money services in the world today, mainly in emergingTure oF Money october 2012 - April 2013 Muriel Ansley reynolds exhibit GAllery For the full exhibit checklist

Loudon, Catherine

350

Telemedicine by mobile communication  

Microsoft Academic Search

We have proposed some techniques for mobile telemedicine and have verified their practical feasibility in experiments. This article presents technical considerations required to realize a practical mobile telemedicine system, techniques developed for multiple medical data transmission, and the satisfactory results of their applications to telemedicine in moving vehicles

Koichi Shimizu

1999-01-01

351

Mobility and Reading Achievement.  

ERIC Educational Resources Information Center

A study examined the effect of geographic mobility on elementary school students' achievement. Although such mobility, which requires students to make multiple moves among schools, can have a negative impact on academic achievement, the hypothesis for the study was that it was not a determining factor in reading achievement test scores. Subjects…

Waters, Theresa Z.

352

Mobile IPv6 Security  

Microsoft Academic Search

This paper presents a case study of security protocol design: authen- tication of binding updates in Mobile IPv6. We go step by step through the threat analysis and show how each threat is addressed in the protocol design. The goal is to solve any new security issues caused by the introduction of mobility without requiring any new security infrastructure.

Tuomas Aura

2002-01-01

353

Mastering Mobile Security  

ERIC Educational Resources Information Center

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…

Panettieri, Joseph C.

2007-01-01

354

Mobile Christian - shuttle flight  

NASA Technical Reports Server (NTRS)

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.

2009-01-01

355

Wheeled hopping mobility  

NASA Astrophysics Data System (ADS)

Sandia National Laboratories has developed a mesoscale wheeled hopping vehicle (WHV) to overcome the longstanding problems of mobility and power in small scale unmanned vehicles. The system provides mobility in situations such as negotiating obstacles in the vertical dimension and rough terrain that are prohibitive for other small ground base vehicles.

Fischer, Gary J.

2005-10-01

356

Aligning product and supply chain strategies in the mobile phone industry  

E-print Network

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 ...

Scanlon, Robert (Robert Curtis)

2009-01-01

357

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

E-print Network

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 ...

McCloskey, Scott H. (Scott Haddon)

2007-01-01

358

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

E-print Network

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 ...

Vardoulias, George

359

Spatially varying registration using Gaussian processes.  

PubMed

In this paper we propose a new approach for spatially-varying registration using Gaussian process priors. The method is based on the idea of spectral tempering, i.e. the spectrum of the Gaussian process is modified depending on a user defined tempering function. The result is a non-stationary Gaussian process, which induces different amount of smoothness in different areas. In contrast to most other schemes for spatially-varying registration, our approach does not require any change in the registration algorithm itself, but only affects the prior model. Thus we can obtain spatially-varying versions of any registration method whose deformation prior can be formulated in terms of a Gaussian process. This includes for example most spline-based models, but also statistical shape or deformation models. We present results for the problem of atlas based skull-registration of cone beam CT images. These datasets are difficult to register as they contain a large amount of noise around the teeth. We show that with our method we can become robust against noise, but still obtain accurate correspondence where the data is clean. PMID:25485406

Gerig, Thomas; Shahim, Kamal; Reyes, Mauricio; Vetter, Thomas; Lüthi, Marcel

2014-01-01

360

Mobile Pit verification system design based on passive special nuclear material verification in weapons storage facilities  

SciTech Connect

A mobile 'drive by' passive radiation detection system to be applied in special nuclear materials (SNM) storage facilities for validation and compliance purposes has been designed through the use of computational modeling and new radiation detection methods. This project was the result of work over a 1 year period to create optimal design specifications to include creation of 3D models using both Monte Carlo and deterministic codes to characterize the gamma and neutron leakage out each surface of SNM-bearing canisters. Results were compared and agreement was demonstrated between both models. Container leakages were then used to determine the expected reaction rates using transport theory in the detectors when placed at varying distances from the can. A 'typical' background signature was incorporated to determine the minimum signatures versus the probability of detection to evaluate moving source protocols with collimation. This established the criteria for verification of source presence and time gating at a given vehicle speed. New methods for the passive detection of SNM were employed and shown to give reliable identification of age and material for highly enriched uranium (HEU) and weapons grade plutonium (WGPu). The finalized 'Mobile Pit Verification System' (MPVS) design demonstrated that a 'drive-by' detection system, collimated and operating at nominally 2 mph, is capable of rapidly verifying each and every weapon pit stored in regularly spaced, shelved storage containers, using completely passive gamma and neutron signatures for HEU and WGPu. This system is ready for real evaluation to demonstrate passive total material accountability in storage facilities. (authors)

Paul, J. N.; Chin, M. R.; Sjoden, G. E. [Nuclear and Radiological Engineering Program, George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, 770 State St, Atlanta, GA 30332-0745 (United States)

2013-07-01

361

Assessment of renewable energy technology and a case of sustainable energy in mobile telecommunication sector.  

PubMed

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

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

2014-01-01

362

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

PubMed Central

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

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

2014-01-01

363

Skylab mobile laboratory  

NASA Technical Reports Server (NTRS)

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.

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

1975-01-01

364

Promoting Function, Independence, and Mobility  

MedlinePLUS

... services, employment, travel, sports, relationships, sexuality and parenting. Share Smaller Text Larger Text Print Mobility and Accessibility Staying Mobile Increasing Accessibility Emotional Adjustment Find an MS Care ...

365

Exploring Employee Perspectives on Information Privacy and Security in the Mobile Environment  

Microsoft Academic Search

Maintaining information privacy and security in the mobile environment, an issue having personal and organizational implications,\\u000a remains a challenge because the context of a mobile device can change rapidly. In response to this, the authors have been\\u000a investigating methods of maintaining the privacy of sensitive information accessed in mobile environments (i.e. potentially\\u000a in public places). This particular study, still in

Peter Tarasewich; Benjamin Ngugi; Mansi Sanghavi

2009-01-01

366

Enabling mHealth while assuring compliance: reliable and secure information access in a mobile world.  

PubMed

An increasingly mobile clinical workforce rapidly adopting consumer devices to access mobile, cloud-based applications, complemented by the wide range of mobile storage devices and other portable electronics, such as digital cameras, MP3 players, can make it difficult to efficiently assure compliance without impacting user productivity. This article reviewed a number of healthcare use cases and introduced comprehensive concepts and possible automated solutions to meet the requirements of a highly complex infrastructure of devices accessing confidential information. PMID:23039784

Wirth, Axel

2012-01-01

367

Towards an Integrated LBS-Enabled, Mobile Auctions Marketplace for Logistics Services  

Microsoft Academic Search

Rapid mobile communications penetration in Europe set the basis for the evolution of innovative mobile commerce applications. The integration of mobile commerce and Location-Based Services provides the infrastructure for geographically-focused trade of logistics services, such as the freight transport. The present paper presents a pragmatic information flow model of an auction-based freight transport marketplace, where potential bidders (carriers) are selected

Dimitrios M. Emiris; Charis A. Marentakis; Panayiotis P. Laimos

2007-01-01

368

iZone: A Location-Based Mobile Social Networking System  

Microsoft Academic Search

The rapid development of wireless technology, the extensive use of mobile\\u000aphones and the availability of location information are facilitating\\u000apersonalized location-based applications. Easy to carry, easy to use and easy\\u000ato buy, smart phones with certain software are of great advantage.\\u000aConsequently, mobile social networking (MSN) systems have emerged rapidly,\\u000abeing a revolution for our everyday life. Based on

Rui Cheng; Zhuo Yang; Feng Xia

2010-01-01

369

Mobile Perspectives: On Teaching Mobile Literacy  

ERIC Educational Resources Information Center

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

Parry, David

2011-01-01

370

Predictive location-based QoS routing in mobile ad hoc networks  

Microsoft Academic Search

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

Samarth H. Shah; Klara Nahrstedt

2002-01-01

371

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

Microsoft Academic Search

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

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

1996-01-01

372

Design and Implementation of Mobile GeoSpatial Information System for Public Health Emergency  

Microsoft Academic Search

As mobile devices like personal digital assistant (PDA) or handheld PC (HPC) are rapidly developing and the wireless Internet is increasingly used, interests in the mobile geospatial information system are gradually expanded. Nowadays, the outbreak of emergent public health events can be heard more often than before and make lots of people ill in a short time. How to deal

Weixing Wang; Jianhua Gong; Lihui Zhang; Jinjin Zhang; Fang Liqun; Cao Wuchun

2009-01-01

373

The European market for mobile data: evolving value chains and industry structures  

Microsoft Academic Search

Whether Europe will be able to maintain its strong position in mobile telecommunications will depend to a large degree on the transition to the next generation technology. Unlike other countries and regions that have embarked on a more gradual transition model, European policy-makers and industry leaders envision a rapid introduction of the next platform, the Universal Mobile Telecommunications System (UMTS).

Carleen F. Maitland; Johannes M. Bauer; Rudi Westerveld

2002-01-01

374

Exploring College Students' Attitudes and Self-Efficacy of Mobile Learning  

ERIC Educational Resources Information Center

Previous studies have indicated that computers and the internet play very important roles in students' acceptance and use of new information technology. In recent years, with the rapid development of mobile technology, mobile learning (m-learning) has becoming another popular topic. However, little is known about the students' attitudes and…

Yang, Shih-hsien

2012-01-01

375

A Development Platform for the Design and Optimization of Mobile Radio Networks  

Microsoft Academic Search

The rapidly increasing traffic demand from mobile users forces network operators and service providers to extend and optimize existing networks as well as to plan entirely new mobile radio networks. Current planning methods rely on static coverage prediction. The optimization is partly based on measurements and gathered experiences in connection with empirical methods. However, these methods do not adequately take

Jürgen Deissner; Gerhard Fettweis; Jörg Fischer; Dietrich Hunold; Jens Voigt; Ralf Lehnert; Mathias Schweigel; Jörg Wagner

1999-01-01

376

Mobile Practices in Everyday Life: Popular Digital Technologies and Schooling Revisited  

ERIC Educational Resources Information Center

Mobile phones have rapidly been absorbed into the fabric of our day-to-day lives. They are now a key consumer item, a symbol of social capital and they connect their users to a mobile web with multiple applications. As ownership and access to smartphones has spread into the teenage years, their place in institutions of formal education has been…

Merchant, Guy

2012-01-01

377

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

ERIC Educational Resources Information Center

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…

Norris, Daniel T.

2007-01-01

378

Spring 2012 Distance Learning Class COT 6930 Android Mobile Component Development  

E-print Network

Spring 2012 ­ Distance Learning Class COT 6930 ­ Android Mobile Component Development Course Syllabus: Software tool and library development for the Android mobile platform using Java and XML, to facilitate rapid development of optimized Android applications. Text: Murphy, Mark L., The Busy Coder's Guide

Fernandez, Eduardo

379

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

Microsoft Academic Search

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

Conor Higgins; Áine Kearns; Sue Franklin

2012-01-01

380

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

Microsoft Academic Search

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

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

2010-01-01

381

Integrating mobile agent with multi-agent system for intelligent parking negotiation and guidance  

Microsoft Academic Search

In metropolises, parking fees vary widely and change dynamically in different periods of time and may not always match the drivers' expectation price. In order to provide the consumers a bargaining platform, an intelligent parking negotiation and guidance system is proposed through integrating the mobile agent with multi-agent system. The use of mobile agent allows the dynamic, stable and fast

Wang Longfei; Chen Hong; Li Yang

2009-01-01

382

GENETIC-ALGORITHM SEEDING OF IDIOTYPIC NETWORKS FOR MOBILE-ROBOT NAVIGATION  

E-print Network

GENETIC-ALGORITHM SEEDING OF IDIOTYPIC NETWORKS FOR MOBILE-ROBOT NAVIGATION Amanda M. Whitbrook@cs.nott.ac.uk Keywords: Mobile-robot navigation, genetic algorithm, artificial immune system, idiotypic network. Abstract to produce dynamic systems that can adapt to complex, varying, real-world tasks. Jerne's idiotypic

Aickelin, Uwe

383

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...

384

Limits of social mobilization.  

PubMed

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

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

2013-04-16

385

Mobile sensing systems.  

PubMed

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

Macias, Elsa; Suarez, Alvaro; Lloret, Jaime

2013-01-01

386

Limits of social mobilization  

PubMed Central

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

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

2013-01-01

387

Mobile Sensing Systems  

PubMed Central

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

Macias, Elsa; Suarez, Alvaro; Lloret, Jaime

2013-01-01

388

3D-printing spatially varying BRDFs.  

PubMed

A new method fabricates custom surface reflectance and spatially varying bidirectional reflectance distribution functions (svBRDFs). Researchers optimize a microgeometry for a range of normal distribution functions and simulate the resulting surface's effective reflectance. Using the simulation's results, they reproduce an input svBRDF's appearance by distributing the microgeometry on the printed material's surface. This method lets people print svBRDFs on planar samples with current 3D printing technology, even with a limited set of printing materials. It extends naturally to printing svBRDFs on arbitrary shapes. PMID:24808130

Rouiller, Olivier; Bickel, Bernd; Kautz, Jan; Matusik, Wojciech; Alexa, Marc

2013-01-01

389

Diffusion in spatially varying porous media  

E-print Network

The problem of diffusion in a porous medium with a spatially varying porosity is considered. The particular microstructure analyzed comprises a collection of impenetrable spheres, though the methods developed are general. Two different approaches for calculating the effective diffusion coefficient as a function of the microstructure are presented. The first is a deterministic approach based on the method of multiple scales; the second is a stochastic approach for small volume fraction of spheres based on matched asymptotic expansions. We compare the two approaches, and we show good agreement between them in a number of example configurations.

Bruna, Maria

2015-01-01

390

Linear Parameter Varying Control for Actuator Failure  

NASA Technical Reports Server (NTRS)

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.

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

2002-01-01

391

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 “ ...

392

76 FR 24051 - In the Matter of Certain Electronic Devices, Including Mobile Phones, Mobile Tablets, Portable...  

Federal Register 2010, 2011, 2012, 2013, 2014

...Mobile Phones, Mobile Tablets, Portable Music Players, and Computers, and Components...mobile phones, mobile tablets, portable music players, and computers, and components...mobile phones, mobile tablets, portable music players, and computers, and...

2011-04-29

393

Introduction and comparison of next-generation mobile wireless technologies  

NASA Astrophysics Data System (ADS)

Mobile networks and services have gone further than voice-only communication services and are rapidly developing towards data-centric services. Emerging mobile data services are expected to see the same explosive growth in demand that Internet and wireless voice services have seen in recent years. To support such a rapid increase in traffic, active users, and advanced multimedia services implied by this growth rate along with the diverse quality of service (QoS) and rate requirements set by these services, mobile operator need to rapidly transition to a simple and cost-effective, flat, all IP-network. This has accelerated the development and deployment of new wireless broadband access technologies including fourth-generation (4G) mobile WiMAX and cellular Long-Term Evolution (LTE). Mobile WiMAX and LTE are two different (but not necessarily competing) technologies that will eventually be used to achieve data speeds of up to 100 Mbps. Speeds that are fast enough to potentially replace wired broadband connections with wireless. This paper introduces both of these next generation technologies and then compares them in the end.

Zaidi, Syed R.; Hussain, Shahab; Ali, M. A.; Sana, Ajaz; Saddawi, Samir; Carranza, Aparicio

2010-01-01

394

Mobile Learning Initiative (MLI) Spring 2012 Mobile Learning Campus Climate  

E-print Network

.............................................................................................................................. 30 A. Demographics of 2012 Faculty Mobile Computing Survey Respondents B. Demographics of 2011 and 2012 Student Mobile Computing Survey Respondents C. Example Faculty Comments from Open-Ended Feedback DPage | 1 Mobile Learning Initiative (MLI) Spring 2012 Mobile Learning Campus Climate Assessment

Barrash, Warren

395

A MOBILE MAPPING DATA WAREHOUSE FOR EMERGING MOBILE VISION SERVICES  

Microsoft Academic Search

Mobile vision services are a type of mobile ITS applications that emerge with increased miniaturization of sensor and computing devices, such as in camera equipped mobile phones, and appropriate adoption of advanced computer vision methodologies. The interpretation of mobile imagery with reference to geo-coded information from augmented city maps offers new applications. In this paper we describe a central component

Linde Vande Velde; Lucas Paletta; Katrin Amlacher; Patrick Luley; Alexander Almer; Roland Perko

396

The Requirements for Personal Mobile Assistants in a Mobile  

E-print Network

Introduction Mobility/mobile and agent are terms that are commonly used by computer scientists, including interface agents, softbots, mobile agents, information agents, and believable agents. In general," agents may be classified as local agents and mobile agents. Local Agents These agents, like interface

Huhns, Michael N.

397

Localization of mobile robots in a network using mobile agents  

Microsoft Academic Search

With the progressive growth in the domain of autonomous mobile robot, mobile robots should have the capability of taking intelligent decision for their movement plan. In real time, it should be necessary for mobile robots to consume less amount of energy in navigating also. In our paper we proposed a multi agent based architecture which aims to utilize mobile agent

Shashank Srivastava; G. C. Nandi

2010-01-01

398

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.

399

Mobile Manufacturers Forum  

NSDL National Science Digital Library

This is the home page of the Mobile Manufacturer's Forum, an international association of several leading "radio communications equipment manufacturers." Its purpose is to inform the general public about health policies and standards regarding radio frequency (RF) energy emitted by mobile phones and base stations. There are several documents and press releases that can be accessed on the Web site. One in particular, called the Health Policy Update, outlines the research findings of government agencies and independent organizations. These include recommendations for safe design and use, and assessments of health risks associated with cellular phones and other RF devices. An overview of mobile phone technology is also presented.

400

Toroidal Varied-Line Space (TVLS) Gratings  

NASA Technical Reports Server (NTRS)

It is a particular challenge to develop a stigmatic spectrograph for XUV wavelengths since the very low normal-incidence reflectance of standard materials most often requires that the design be restricted to a single optical element which must simultaneously provide both re-imaging and spectral dispersion. This problem has been solved in the past by the use of toroidal gratings with uniform line-spaced rulings (TULS). A number of solar EUV (Extreme Ultraviolet) spectrometers have been based on such designs, including SOHO/CDS, Solar-B/EIS, and the sounding rockets SERTS and EUNIS. More recently, Kita, Harada, and collaborators have developed the theory of spherical gratings with varied line-space rulings (SVLS) operated at unity magnification, which have been flown on several astronomical satellite missions. We now combine these ideas into a spectrometer concept that puts varied-line space rulings onto toroidal gratings. Such TVLS designs are found to provide excellent imaging even at very large spectrograph magnifications and beam-speeds, permitting extremely high-quality performance in remarkably compact instrument packages. Optical characteristics of two solar spectrometers based on this concept are described: SUMI, proposed as a sounding rocket experiment, and NEXUS, proposed for the Solar Dynamics Observatory mission.

Thomas, Roger J.; Oegerle, William (Technical Monitor)

2002-01-01

401

Varying prior information in Bayesian inversion  

NASA Astrophysics Data System (ADS)

Bayes' rule is used to combine likelihood and prior probability distributions. The former represents knowledge derived from new data, the latter represents pre-existing knowledge; the Bayesian combination is the so-called posterior distribution, representing the resultant new state of knowledge. While varying the likelihood due to differing data observations is common, there are also situations where the prior distribution must be changed or replaced repeatedly. For example, in mixture density neural network (MDN) inversion, using current methods the neural network employed for inversion needs to be retrained every time prior information changes. We develop a method of prior replacement to vary the prior without re-training the network. Thus the efficiency of MDN inversions can be increased, typically by orders of magnitude when applied to geophysical problems. We demonstrate this for the inversion of seismic attributes in a synthetic subsurface geological reservoir model. We also present results which suggest that prior replacement can be used to control the statistical properties (such as variance) of the final estimate of the posterior in more general (e.g., Monte Carlo based) inverse problem solutions.

Walker, Matthew; Curtis, Andrew

2014-06-01

402

Detecting skin colors under varying illumination  

NASA Astrophysics Data System (ADS)

Skin color has been used as an important cue for various human related computer vision applications. However, detecting skin colors under varying illumination is a challenging task, as the appearance of skin in an image highly depends on the illumination under which the image was taken. To this end, a method for detecting skin colors under varying illumination is proposed in this paper. First, spatial illumination variation is identified and the images are segmented into different regions with different illumination. Each illumination region of color images are corrected base on the illuminant estimated by a local edge-based color constancy algorithm. Then, the corrected images are transformed into a color-space, where statistical results on a skin dataset show that the skin color cluster and non-skin color clusters are separated. Finally, the skin colors are modeled under Bayesian decision framework and classified from non-skin colors. The experimental results show that the proposed method is robust to illumination variations.

Liu, Leyuan; Huang, Rui; Yang, Saiyong; Sang, Nong

2011-11-01

403

Varying execution discipline to increase performance  

SciTech Connect

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.

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

1993-12-22

404

Transient, spatially varied groundwater recharge modeling  

NASA Astrophysics Data System (ADS)

The objective of this work is to integrate field data and modeling tools in producing temporally and spatially varying groundwater recharge in a pilot watershed in North Okanagan, Canada. The recharge modeling is undertaken by using the Richards equation based finite element code (HYDRUS-1D), ArcGIS™, ROSETTA, in situ observations of soil temperature and soil moisture, and a long-term gridded climate data. The public version of HYDUS-1D and another version with detailed freezing and thawing module are first used to simulate soil temperature, snow pack, and soil moisture over a one year experimental period. Statistical analysis of the results show both versions of HYDRUS-1D reproduce observed variables to the same degree. After evaluating model performance using field data and ROSETTA derived soil hydraulic parameters, the HYDRUS-1D code is coupled with ArcGIS™ to produce spatially and temporally varying recharge maps throughout the Deep Creek watershed. Temporal and spatial analysis of 25 years daily recharge results at various representative points across the study watershed reveal significant temporal and spatial variations; average recharge estimated at 77.8 ± 50.8 mm/year. Previous studies in the Okanagan Basin used Hydrologic Evaluation of Landfill Performance without any attempt of model performance evaluation, notwithstanding its inherent limitations. Thus, climate change impact results from this previous study and similar others, such as Jyrkama and Sykes (2007), need to be interpreted with caution.

Assefa, Kibreab Amare; Woodbury, Allan D.

2013-08-01

405

Brown Dwarf Variability: What's Varying and Why?  

NASA Technical Reports Server (NTRS)

Surveys by ground based telescopes, HST, and Spitzer have revealed that brown dwarfs of most spectral classes exhibit variability. The spectral and temporal signatures of the variability are complex and apparently defy simplistic classification which complicates efforts to model the changes. Important questions include understanding if clearings are forming in an otherwise uniform cloud deck or if thermal perturbations, perhaps associated with breaking gravity waves, are responsible. If clouds are responsible how long does it take for the atmospheric thermal profile to relax from a hot cloudy to a cooler cloudless state? If thermal perturbations are responsible then what atmospheric layers are varying? How do the observed variability timescales compare to atmospheric radiative, chemical, and dynamical timescales? I will address such questions by presenting modeling results for time-varying partly cloudy atmospheres and explore the importance of various atmospheric processes over the relevant timescales for brown dwarfs of a range of effective temperatures. Regardless of the origin of the observed variability, the complexity seen in the atmospheres of the field dwarfs hints at the variability that we may encounter in the next few years in directly imaged young Jupiters. Thus understanding the nature of variability in the field dwarfs, including sensitivity to gravity and metallicity, is of particular importance for exoplanet characterization.

Marley, Mark Scott

2014-01-01

406

Rapidity Gaps Between Jets  

E-print Network

An excess of events with a rapidity gap between jets, over what would be expected from non-diffractive processes, has been observed at HERA. A process based on a perturbative QCD calculation of colour singlet exchange has been added to HERWIG. With this addition, HERWIG is able to describe the number of events with a gap between jets over the number without a gap. This gap fraction is predicted to rise at large rapidity intervals between jets which would only be visible if the detector coverage were increased.

J. M. Butterworth; M. E. Hayes; M. H. Seymour; L. E. Sinclair

1996-09-02

407

Rapid small lot manufacturing  

SciTech Connect

The direct connection of information, captured in forms such as CAD databases, to the factory floor is enabling a revolution in manufacturing. Rapid response to very dynamic market conditions is becoming the norm rather than the exception. In order to provide economical rapid fabrication of small numbers of variable products, one must design with manufacturing constraints in mind. In addition, flexible manufacturing systems must be programmed automatically to reduce the time for product change over in the factory and eliminate human errors. Sensor based machine control is needed to adapt idealized, model based machine programs to uncontrolled variables such as the condition of raw materials and fabrication tolerances.

Harrigan, R.W.

1998-05-09

408

Developing collaborative peer-to-peer applications on mobile devices  

Microsoft Academic Search

Mobile computing has experienced a rapid growth and there are nowadays many applications being developed. According to the literature, many of these applications are designed for collaborative work or learning and share the same requirements: they implement a peer-to-peer communication architecture, there are subgroups inside the group of participants which have to work together and coordinate with the rest of

Cláudio Sapateiro; Nelson Baloian; Pedro Antunes; Gustavo Zurita

2009-01-01

409

Networked infomechanical systems: a mobile embedded networked sensor platform  

Microsoft Academic Search

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

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

410

Universities and Libraries Move to the Mobile Web  

ERIC Educational Resources Information Center

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…

Aldrich, Alan W.

2010-01-01

411

Can mobile virtual fitness apps replace human fitness trainer?  

Microsoft Academic Search

The increased need in promoting fitness activity and rapid growth of smart-phones has urged the development of mobile virtual fitness apps (MVFA). Yet, evaluation on these MVFA has been limited and, therefore, this study attempts to conduct preliminary evaluation on randomly sampled MVFA based on our proposed system workflow using theories of social support and persuasive technology, and the American

Ron Kwok Chi-Wai; Stanley Hui Sai-Chuen; Tania Mak So-Ning; Peter Wu Ka-Shun; Ken Lee Wing-Kuen; Clara Wong Choi-Ki

2011-01-01

412

Motivation Matters in Mobile Language Learning: A Brief Commentary  

ERIC Educational Resources Information Center

As highlighted in the original call for papers for this special issue, learning with mobile technologies is currently a rapidly developing area of interest for researchers, teachers, materials writers and app developers in the educational field, not least within language education. Yet to what extent is this growing interest realised and shared by…

Ushioda, Ema

2013-01-01

413

Embedded System Software Testing Based On SOA For Mobile Service  

Microsoft Academic Search

Recently, the need for accessing information from anywhere at any time has been a driving force for a variety of mobile applications. As the number of embedded systems increases rapidly, there has been a growing demand for the use of Service Oriented Architecture (SOA) for various applications. Embedded system service offers a systematic way to classify and assess technical realizations

Myung-Hee Lee; Cheol-Jung Yoo; Ok-Bae Jang

414

Scalable load balancing on distributed web servers using mobile agents  

Microsoft Academic Search

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

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

2003-01-01

415

Proactive seamless mobility management for future IP radio access networks  

Microsoft Academic Search

Cellular communications are aligning rapidly to adopt suitable network models for supporting packet switched services over IP networks. Pure third generation (3G) wireless architectures have already adopted IP as the network layer bearer within their core network component specification. This article presents an architecture and protocol in support of proactive mobility management for future IP radio access networks. It encompasses

T. Pagtzis; P. Kirsteina; S. Hailes; H. Afifi

416

Virtual Credit Cards on Mobile for M-Commerce Payment  

Microsoft Academic Search

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

Narongrit Waraporn; Manawat Sithiyavanich; Hathaichanok Jiarawattanasawat; Narin Pakchai

2009-01-01

417

Tuning the lateral mobility of thin block copolymer films  

NASA Astrophysics Data System (ADS)

Polymer mobility in confined environments is of both theoretical and practical interest. The controlled formation and characterization of systems where such effects can be studied remain active areas of investigation. In this work, we created ultrathin (< 50 nm) supported films of amphiphilic polybutylene-poly(ethylene) oxide diblock copolymers, through Langmuir-Blodgett and Langmuir-Schaefer techniques. To adjust the lateral mobility of these ultrathin films, short polyisobutylene homopolymer was introduced during the film assembly process. Preliminary fluorescence recovery after photobleaching (FRAP) results show that the lateral mobility of the block copolymers is proportional to the logarithm of homopolymer concentration. The mobility can be varied by up to a factor of 8 with as little as 1 mol% of homopolymer. The role of the added homopolymer on the block copolymer lateral mobility is likely to be related with several features such as chain entanglements, interfacial constraints, and interlayer friction. By varying the concentration and the molecular weight of the homopolymer introduced into the films, we attempt to explain the underlying physical mechanisms that are responsible for changes in lateral mobility.

Bermudez, Harry; Kourouklis, Andreas

2013-03-01

418

MODELING RELATIONSHIPS BETWEEN MOBILE SOURCE PARTICLE EMISSIONS AND POPULATION EXPOSURES  

EPA Science Inventory

Results from this analysis were recently published (Greco, et al., 2007b). For primary fine particulate matter emitted from mobile sources, the intake fractions varied across source counties from 0.14 to 23 per million (median of 1.2 per million). These values were highly...

419

Differential mobility analyser transfer functions in scanning mode  

Microsoft Academic Search

A novel method is described for the calculation of the differential mobility analyser (DMA) transfer function in scanning mode, which is based on the derivation of an analytical solution for the non-diffusive particle trajectories inside the DMA, under exponentially varying electrical field and fully developed laminar flow. The scanning mode transfer functions can substantially improve the measurement accuracy of fast

Athanasios Mamakos; Leonidas Ntziachristos; Zissis Samaras

2008-01-01

420

Making It in America: Social Mobility in the Immigrant Population  

ERIC Educational Resources Information Center

In his survey of research on social mobility and U.S. immigration, George Borjas underscores two insights. First, most immigrants are at a sizable earnings disadvantage, relative to nativeborn workers. Second, the earnings of different groups of immigrants vary widely. The children of immigrants "catch up" to native-born workers slowly.…

Borjas, George J.

2006-01-01

421

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

ERIC Educational Resources Information Center

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…

Swaminathan, Mina, Ed.

422

Stable flocking of mobile agents part I: dynamic topology  

Microsoft Academic Search

This is the second of a two-part paper, investigating the stability properties of a system of multiple mobile agents with double integrator dynamics. In this second part, we allow the topology of the control inter-connections between the agents in the group to vary with time. Specifically, the control law of an agent depends on the state of a set of

Herbert G. Tanner; Ali Jadbabaie; George J. Pappas

2003-01-01

423

Modeling and control of formations of nonholonomic mobile robots  

Microsoft Academic Search

This paper addresses the control of a team of nonholonomic mobile robots navigating in a terrain with obstacles while maintaining a desired formation and changing formations when required, using graph theory. We model the team as a triple, , consisting of a group ele- ment that describes the gross position of the lead robot, a set of shape vari- ables

Jaydev P. Desai; James P. Ostrowski; Vijay Kumar

2001-01-01

424

Effects of particle shape and mobility on stable armor development  

Microsoft Academic Search

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

Basil Gomez

1994-01-01

425

State-Controlled Licensure and Interstate Mobility: Questions from Katrina  

ERIC Educational Resources Information Center

State licensure laws in speech-language pathology and audiology vary from state to state. Natural disaster displacements as well as trends in job mobility have increased the need for licensees to be able to have more fluidity in practicing from 1 state to another. Additionally, literature reviews on the history of professional licensure…

Taylor, Carmen L.

2006-01-01

426

Induction and herbivore mobility affect the evolutionary escalation  

E-print Network

Induction and herbivore mobility affect the evolutionary escalation of plant defence Peter Tiffin and there is a lag between attack and induction. Herbivore and plant population sizes are fixed or vary as a function reductions in plant fecundity and population sizes, and be important selective forces acting on plant

Underwood, Nora

427

Mobile phones and health: a literature overview.  

PubMed

The rapidly evolving mobile phone technology raised public concern about the possibility of associated adverse health effects. The current body of evidence is summarized addressing epidemiological studies, studies investigating adverse biological effects, other biological effects, basic mechanisms and indirect effects. Currently, the balance of evidence from epidemiological studies suggests that there is no association between mobile phone radiation and cancer. This finding is consistent with experimental results. There is some evidence for biological effects, which, however, are not necessarily hazardous for humans. No basic mechanisms of biological effects have been consistently identified yet. Using a mobile phone while driving a car is significantly associated with a higher risk of vehicle collisions, independently of the use of hands-free kits. Medical equipment or implanted pacemakers may be affected by mobile phone radiation under very specific conditions. Current studies, however are affected by several limitations and do not generally exclude any increased health risk. Further high-quality research is therefore necessary. Furthermore, it is important that the results of scientific research are communicated to the public in a transparent and differentiated way. PMID:16008077

Karger, Christian P

2005-01-01

428

Adapting End Host Congestion Control for Mobility  

NASA Technical Reports Server (NTRS)

Network layer mobility allows transport protocols to maintain connection state, despite changes in a node's physical location and point of network connectivity. However, some congestion-controlled transport protocols are not designed to deal with these rapid and potentially significant path changes. In this paper we demonstrate several distinct problems that mobility-induced path changes can create for TCP performance. Our premise is that mobility events indicate path changes that require re-initialization of congestion control state at both connection end points. We present the application of this idea to TCP in the form of a simple solution (the Lightweight Mobility Detection and Response algorithm, that has been proposed in the IETF), and examine its effectiveness. In general, we find that the deficiencies presented are both relatively easily and painlessly fixed using this solution. We also find that this solution has the counter-intuitive property of being both more friendly to competing traffic, and simultaneously more aggressive in utilizing newly available capacity than unmodified TCP.

Eddy, Wesley M.; Swami, Yogesh P.

2005-01-01

429

Eulerian indicators under continuously varying conditions  

NASA Astrophysics Data System (ADS)

In this paper, we extend the notion of Eulerian indicators (EIs) for predicting Lagrangian mixing behavior previously developed for blinking flows to the continuous time setting. We apply the EIs to a study of mixing in a kinematic model of a time-dependent double-gyre with five different time dependencies—sinusoidal, sawtooth, square wave, triangular, and noise (which is constructed so that it is also periodic in time). Each of the five velocity fields is described by two parameters; the strength of the time dependence (?) and the period (T). Based on a trajectory based quality of mixing diagnostic (Danckwerts' normalized variance of concentration) we find that noisy time dependence has the largest region of good mixing in the parameter space and triangular time dependence has parameter values corresponding to the most complete and fastest mixing. These Lagrangian based predictions are confirmed by the EIs (product of the transversality and mobility). Although not every feature of the mixing behavior is captured by EIs, we show that they do in general predict the regions in the parameter space under consideration that correspond to good mixing. Moreover, the EIs offer a factor of 100 computational advantage in exploring the parameter space in comparison with the trajectory based mixing diagnostic.

McIlhany, Kevin L.; Wiggins, Stephen

2012-07-01

430

Locating Objects in Mobile Computing  

Microsoft Academic Search

Abstract In current distributed systems, the notion of mobility is emerging in many forms and appli - cations Mobility arises naturally in wireless computing, since the location of users changes as they move Besides mobility in wireless computing, software mobile agents are another popular form of moving objects Locating objects, i e , identifying their current location, is central to

Evaggelia Pitoura; George Samaras

2001-01-01

431

Mobile Computig: Conclusions Evaggelia Pitoura  

E-print Network

' & $ % Mobile Computig: Conclusions Evaggelia Pitoura Computer Science Department, University; ' & $ % Mobile Computing Models ffl What is the best way to partition a computation as well as the functionality connectivity conditions. E. Pitoura ­ Summer School on Mobile Computing, Jyvaskyla, 1998 1 #12; ' & $ % Mobile

Pitoura, Evaggelia

432

Sensor networks with mobile agents  

Microsoft Academic Search

Architecture for large scale low power sensor network is proposed. Referred to as sensor networks with mobile agents (SENMA), SENMA exploit node redundancies by introducing mobile agents that communicate opportunistically with a large field of sensors. The addition of mobile agents shifts computationally intensive tasks away from primitive sensors to more powerful mobile agents, which enables energy efficient operations under

Lang Tong; Qing Zhao; Srihari Adireddy

2003-01-01

433

Mobile Communications May 30, 2013  

E-print Network

Mobile Communications Program May 30, 2013 #12;Overview Background Financial Aspects Operational plans include mobile-mobile, nights & weekends Smartphones ­ 400 minute plan, includes unlimited data.98/month Unlimited text messaging can be added for $12/month Unlimited data for mobile broadband card

434

Mobility. Snapshot Report, Fall 2011  

ERIC Educational Resources Information Center

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.

National Student Clearinghouse, 2011

2011-01-01

435

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.

436

A Mobile Robot Project  

E-print Network

We are building a mobile robot which will roam around the AI lab observing and later perhaps doing. Our approach to building the robot and its controlling software differs from that used in many other projects in a number ...

Brooks, Rodney A.

437

Mobile Computation with Functions   

E-print Network

The practice of computing has reached a stage where computers are seen as parts of a global computing platform. The possibility of exploiting resources on a global scale has given rise to a new paradigm -- the mobile computation paradigm...

K?rl?, Zeliha D

438

Build Your Own Mobile  

NSDL National Science Digital Library

Student teams creatively construct mobiles using hangers and assorted materials and objects while exploring the principles of balance and center of mass. They build complex, free-hanging structures by balancing pieces with different lengths, weights, shapes and sizes.

Center for Engineering Educational Outreach,

439

Contextualizing urban mobile fabrics  

E-print Network

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 ...

Lin, Michael Chia-Liang

2007-01-01

440

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.

441

AUSSAT mobile satellite services  

NASA Technical Reports Server (NTRS)

An overview of AUSSAT's planned mobile satellite system is given. The development program which is being undertaken to achieve the 1992 service date is described. Both business and technical aspects of the development program are addressed.

Nowland, Wayne L.; Wagg, Michael; Simpson, Daniel

1988-01-01

442

Biogeochemistry: Old carbon mobilized  

NASA Astrophysics Data System (ADS)

Soil contains aged organic carbon that can be hundreds or thousands of years old. Human disturbance in small and large watersheds is mobilizing some of this fossil carbon from soils to aquatic systems.

Evans, Chris

2015-02-01

443

Limits of social mobilization  

E-print Network

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 ...

Pentland, Alex Paul

444

On controller tuning for a flexible-link manipulator with varying payload  

NASA Technical Reports Server (NTRS)

In this article experimental results are presented for system identification and control of a single-link flexible manipulator carrying an unknown, varying payload. The control objective is to maintain endpoint position accuracy in the presence of flexure effects after rapid movement due to a rigid body slew-angle commanded position. Various time-domain parameter estimation techniques are used to identify ARMA model representations to be employed in controller tuning schemes for vibration compensation. Only endpoint acceleration measurements and motor shaft angle measurements are utilized in relatively simple PID control schemes, which are tuned as dictated by a varying, unknown payload.

Yurkovich, Stephen; Pachecho, Fernando E.

1989-01-01

445

RAPIDITY GAPS BETWEEN JETS AT LARGE RAPIDITY SEPARATIONS  

E-print Network

RAPIDITY GAPS BETWEEN JETS AT LARGE RAPIDITY SEPARATIONS IN PHOTOPRODUCTION AT HERA Angela Wyatt;ned using the inclusive k t algorithm. Rapidity gap events are de#12;ned as events in which the sum t gap fraction, de#12;ned as the fraction of dijet events with a rapidity gap, is plotted

446

Rapid Prototyping in PVS  

NASA Technical Reports Server (NTRS)

PVSio is a conservative extension to the PVS prelude library that provides basic input/output capabilities to the PVS ground evaluator. It supports rapid prototyping in PVS by enhancing the specification language with built-in constructs for string manipulation, floating point arithmetic, and input/output operations.

Munoz, Cesar A.; Butler, Ricky (Technical Monitor)

2003-01-01

447

AFRPL Rapid Indexing System.  

ERIC Educational Resources Information Center

A modified Keyword Out of Context (KWOC) system was developed to gain rapid control over more than 8,000 scattered, unindexed documents. This was the first step in providing the technical information support required by Air Force Rocket Propulsion Laboratory scientists and engineers. Implementation of the KWOC system, computer routines, and…

Beltran, Alfred A.

448

CTEP RAPID COMMUNICATION  

Cancer.gov

CTEP RAPID COMMUNICATION SOLICITATION FOR LETTERS OF INTENT FOR PHASE 1 TRIALS AMINOFLAVONE PRODRUG (AFP-464) NSC 710464 O F N H O NH2 NH2 O NH2 F H3C F 2MeSO3H CTEP is soliciting proposals for phase 1 single agent trials of the aminoflavone

449

Robot machines rapid prototype  

Microsoft Academic Search

Describes the application of an industrial robot to the rapid prototyping of 3D CAD-defined products. Outlines the equipment and the major software issues of the fully automatic offline generation of the robot instructions. Presents performance, limitations and practical results.

Joris S. M. Vergeest; Johan W. H. Tangelder

1996-01-01

450

Advanced rapidity gap trigger  

E-print Network

Nubmer of physically interesting processes is charachterized by the rapidity gaps. In reality, this gaps is filled by uderlying events with high (more than 0.75 for higgs) probability. In this paper we purpose a way to detect this shadowed events with aim to raise the number of rare events.

V. A. Abramovsky; A. V. Dmitriev

2005-01-07

451

Mobile multiple access study  

NASA Technical Reports Server (NTRS)

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.

1977-01-01

452

The Boxes Go Mobile  

NSDL National Science Digital Library

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.

Engineering K-PhD Program,

453

Stem cell mobilization.  

PubMed

Successful blood and marrow transplant (BMT), both autologous and allogeneic, requires the infusion of a sufficient number of hematopoietic progenitor/stem cells (HPCs) capable of homing to the marrow cavity and regenerating a full array of hematopoietic cell lineages in a timely fashion. At present, the most commonly used surrogate marker for HPCs is the cell surface marker CD34, identified in the clinical laboratory by flow cytometry. Clinical studies have shown that infusion of at least 2 x 10(6) CD34(+) cells/kg recipient body weight results in reliable engraftment as measured by recovery of adequate neutrophil and platelet counts approximately 14 days after transplant. Recruitment of HPCs from the marrow into the blood is termed mobilization, or, more commonly, stem cell mobilization. In Section I, Dr. Tsvee Lapidot and colleagues review the wide range of factors influencing stem cell mobilization. Our current understanding focuses on chemokines, proteolytic enzymes, adhesion molecules, cytokines and stromal cell-stem cell interactions. On the basis of this understanding, new approaches to mobilization have been designed and are now starting to undergo clinical testing. In Section II, Dr. Michele Cottler-Fox describes factors predicting the ability to mobilize the older patient with myeloma. In addition, clinical approaches to improving collection by individualizing the timing of apheresis and adjusting the volume of blood processed to achieve a desired product are discussed. Key to this process is the daily enumeration of blood CD34(+) cells. Newer methods of enumerating and mobilizing autologous blood HPCs are discussed. In Section III, Dr. John DiPersio and colleagues provide data on clinical results of mobilizing allogeneic donors with G-CSF, GM-CSF and the combination of both as relates to the number and type of cells collected by apheresis. Newer methods of stem cell mobilization as well as the relationship of graft composition on immune reconstitution and GVHD are discussed. PMID:14633793

Cottler-Fox, Michele H; Lapidot, Tsvee; Petit, Isabelle; Kollet, Orit; DiPersio, John F; Link, Dan; Devine, Steven

2003-01-01

454

TIMED Spacecraft Mobile  

NSDL National Science Digital Library

This is a mobile for learners to assemble, aimed at enhancing their knowledge of NASA spacecraft and scientific facts. Each hanging element of the mobile contains an image and one fact or scientific concept related to the TIMED (Thermosphere, Ionosphere, Mesosphere, Energetics, and Dynamics) spacecraft mission. The cover contains background information about NASA's TIMED mission and two language arts exercises to reinforce space science vocabulary.

2012-08-03

455

Mobile Christian - shuttle flight  

NASA Technical Reports Server (NTRS)

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.

2009-01-01

456

Ellipsometry with randomly varying polarization states.  

PubMed

We show that, under the right conditions, one can make highly accurate polarization-based measurements without knowing the absolute polarization state of the probing light field. It is shown that light, passed through a randomly varying birefringent material has a well-defined orbit on the Poincar sphere, which we term a generalized polarization state, that is preserved. Changes to the generalized polarization state can then be used in place of the absolute polarization states that make up the generalized state, to measure the change in polarization due to a sample under investigation. We illustrate the usefulness of this analysis approach by demonstrating fiber-based ellipsometry, where the polarization state of the probe light is unknown, and, yet, the ellipsometric angles of the investigated sample (? and ?) are obtained with an accuracy comparable to that of conventional ellipsometry instruments by measuring changes to the generalized polarization state. PMID:22274433

Liu, Feng; Lee, Chris J; Chen, Juequan; Louis, Eric; van der Slot, Peter J M; Boller, Klaus J; Bijkerk, Fred

2012-01-16

457

String theory, cosmology and varying constants  

E-print Network

In string theory the coupling ``constants'' appearing in the low-energy effective Lagrangian are determined by the vacuum expectation values of some (a priori) massless scalar fields (dilaton, moduli). This naturally leads one to expect a correlated variation of all the coupling constants, and an associated violation of the equivalence principle. We review some string-inspired theoretical models which incorporate such a spacetime variation of coupling constants while remaining naturally compatible both with phenomenological constraints coming from geochemical data (Oklo; Rhenium decay) and with present equivalence principle tests. Barring a very unnatural fine-tuning of parameters, a variation of the fine-structure constant as large as that recently ``observed'' by Webb et al. in quasar absorption spectra appears to be incompatible with these phenomenological constraints. Independently of any model, it is emphasized that the best experimental probe of varying constants are high-precision tests of the universality of free fall, such as MICROSCOPE and STEP.

Thibault Damour

2002-10-18

458

Application of Hamilton's law of varying action  

NASA Technical Reports Server (NTRS)

The law of varying action enunciated by Hamilton in 1834-1835 permits the direct analytical solution of the problems of mechanics, both stationary and nonstationary, without consideration of force equilibrium and the theory of differential equations associated therewith. It has not been possible to obtain direct analytical solutions to nonstationary systems through the use of energy theory, which has been limited for 140 years to the principle of least action and to Hamilton's principle. It is shown here that Hamilton's law permits the direct analytical solution to nonstationary, initial value systems in the mechanics of solids without any knowledge or use of the theory of differential equations. Solutions are demonstrated for nonconservative, nonstationary particle motion, both linear and nonlinear.

Bailey, C. D.

1975-01-01

459

Time varying arctic climate change amplification  

SciTech Connect

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.

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

2009-01-01

460

Extensible Hardware Architecture for Mobile Robots  

NASA Technical Reports Server (NTRS)

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.

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

2005-01-01

461

Time varying, multivariate volume data reduction  

SciTech Connect

Large-scale supercomputing is revolutionizing the way science is conducted. A growing challenge, however, is understanding the massive quantities of data produced by large-scale simulations. The data, typically time-varying, multivariate, and volumetric, can occupy from hundreds of gigabytes to several terabytes of storage space. Transferring and processing volume data of such sizes is prohibitively expensive and resource intensive. Although it may not be possible to entirely alleviate these problems, data compression should be considered as part of a viable solution, especially when the primary means of data analysis is volume rendering. In this paper we present our study of multivariate compression, which exploits correlations among related variables, for volume rendering. Two configurations for multidimensional compression based on vector quantization are examined. We emphasize quality reconstruction and interactive rendering, which leads us to a solution using graphics hardware to perform on-the-fly decompression during rendering. In this paper we present a solution which addresses the need for data reduction in large supercomputing environments where data resulting from simulations occupies tremendous amounts of storage. Our solution employs a lossy encoding scheme to acrueve data reduction with several options in terms of rate-distortion behavior. We focus on encoding of multiple variables together, with optional compression in space and time. The compressed volumes can be rendered directly with commodity graphics cards at interactive frame rates and rendering quality similar to that of static volume renderers. Compression results using a multivariate time-varying data set indicate that encoding multiple variables results in acceptable performance in the case of spatial and temporal encoding as compared to independent compression of variables. The relative performance of spatial vs. temporal compression is data dependent, although temporal compression has the advantage of offering smooth animations, while spatial compression can handle volumes of larger dimensions.

Ahrens, James P [Los Alamos National Laboratory; Fout, Nathaniel [UC DAVIS; Ma, Kwan - Liu [UC DAVIS

2010-01-01

462

Daily rhythms in mobile telephone communication  

E-print Network

Circadian rhythms are known to be important drivers of human activity and the recent availability of electronic records of human behaviour has provided fine-grained data of temporal patterns of activity on a large scale. Further, questionnaire studies have identified important individual differences in circadian rhythms, with people broadly categorised into morning-like or evening-like individuals. However, little is known about the social aspects of these circadian rhythms, or how they vary across individuals. In this study we use a unique 18-month dataset that combines mobile phone calls and questionnaire data to examine individual differences in the daily rhythms of mobile phone activity. We demonstrate clear individual differences in daily patterns of phone calls, and show that these individual differences are persistent despite a high degree of turnover in the individuals' social networks. Further, women's calls were longer than men's calls, especially during the evening and at night, and these calls wer...

Aledavood, Talayeh; Roberts, Sam G B; Reed-Tsochas, Felix; Moro, Esteban; Dunbar, Robin I M; Saramäki, Jari

2015-01-01

463

On Varying-coefficient Independence Screening for High-dimensional Varying-coefficient Models  

PubMed Central

Varying coefficient models have been widely used in longitudinal data analysis, nonlinear time series, survival analysis, and so on. They are natural non-parametric extensions of the classical linear models in many contexts, keeping good interpretability and allowing us to explore the dynamic nature of the model. Recently, penalized estimators have been used for fitting varying-coefficient models for high-dimensional data. In this paper, we propose a new computationally attractive algorithm called IVIS for fitting varying-coefficient models in ultra-high dimensions. The algorithm first fits a gSCAD penalized varying-coefficient model using a subset of covariates selected by a new varying-coefficient independence screening (VIS) technique. The sure screening property is established for VIS. The proposed algorithm then iterates between a greedy conditional VIS step and a gSCAD penalized fitting step. Simulation and a real data analysis demonstrate that IVIS has very competitive performance for moderate sample size and high dimension. PMID:25484548

Song, Rui; Yi, Feng; Zou, Hui

2014-01-01

464

Mobility of icy sand packs, with application to Martian permafrost  

USGS Publications Warehouse

[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.

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

2009-01-01

465

A robust signalling system for land mobile satellite services  

NASA Technical Reports Server (NTRS)

Presented here is a signalling system optimized to ensure expedient call set-up for satellite telephony services in a land mobile environment. In a land mobile environment, the satellite to mobile link is subject to impairments from multipath and shadowing phenomena, which result in signal amplitude and phase variations. Multipath, caused by signal scattering and reflections, results in sufficient link margin to compensate for these variations. Direct signal attenuation caused by shadowing due to buildings and vegetation may result in attenuation values in excess of 10 dB and commonly up to 20 dB. It is not practical to provide a link with sufficient margin to enable communication when the signal is blocked. When a moving vehicle passes these obstacles, the link will experience rapid changes in signal strength due to shadowing. Using statistical models of attenuation as a function of distance travelled, a communication strategy has been defined for the land mobile environment.

Irish, Dale; Shmith, Gary; Hart, Nick; Wines, Marie

1989-01-01

466

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

SciTech Connect

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.

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

2014-01-01

467

Mobile medical image retrieval  

NASA Astrophysics Data System (ADS)

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.

Duc, Samuel; Depeursinge, Adrien; Eggel, Ivan; Müller, Henning

2011-03-01

468

Mobile money, smallholder farmers, and household welfare in Kenya.  

PubMed

The use of mobile phones has increased rapidly in many developing countries, including in rural areas. Besides reducing the costs of communication and improving access to information, mobile phones are an enabling technology for other innovations. One important example are mobile phone based money transfers, which could be very relevant for the rural poor, who are often underserved by the formal banking system. We analyze impacts of mobile money technology on the welfare of smallholder farm households in Kenya. Using panel survey data and regression models we show that mobile money use has a positive impact on household income. One important pathway is through remittances received from relatives and friends. Such remittances contribute to income directly, but they also help to reduce risk and liquidity constraints, thus promoting agricultural commercialization. Mobile money users apply more purchased farm inputs, market a larger proportion of their output, and have higher profits than non-users of this technology. These results suggest that mobile money can help to overcome some of the important smallholder market access constraints that obstruct rural development and poverty reduction. PMID:25286032

Kikulwe, Enoch M; Fischer, Elisabeth; Qaim, Matin

2014-01-01

469

Mobile Money, Smallholder Farmers, and Household Welfare in Kenya  

PubMed Central

The use of mobile phones has increased rapidly in many developing countries, including in rural areas. Besides reducing the costs of communication and improving access to information, mobile phones are an enabling technology for other innovations. One important example are mobile phone based money transfers, which could be very relevant for the rural poor, who are often underserved by the formal banking system. We analyze impacts of mobile money technology on the welfare of smallholder farm households in Kenya. Using panel survey data and regression models we show that mobile money use has a positive impact on household income. One important pathway is through remittances received from relatives and friends. Such remittances contribute to income directly, but they also help to reduce risk and liquidity constraints, thus promoting agricultural commercialization. Mobile money users apply more purchased farm inputs, market a larger proportion of their output, and have higher profits than non-users of this technology. These results suggest that mobile money can help to overcome some of the important smallholder market access constraints that obstruct rural development and poverty reduction. PMID:25286032

Kikulwe, Enoch M.; Fischer, Elisabeth; Qaim, Matin

2014-01-01

470

Toward a North American Standard for Mobile Data Services  

NASA Technical Reports Server (NTRS)

The rapid introduction of digital mobile communications systems is an important part of the emerging digital communications scene. These developments pose both a potential problem and a challenge. On one hand, these separate market driven developments can result in an uncontrolled mixture of analog and digital links which inhibit data modem services across the mobile/Public Switched network (PSTN). On the other hand, the near coincidence of schedules for development of some of these systems, i.e., Digital Cellular, Mobile Satellite, Land Mobile Radio, and ISDN, provides an opportunity to address interoperability problems by defining interfaces, control, and service standards that are compatible among these new services. In this paper we address the problem of providing data services interoperation between mobile terminals and data devices on the PSTN. The expected data services include G3 Fax, asynchronous data, and the government's STU-3 secure voice system, and future data services such as ISDN. We address a common architecture and a limited set of issues that are key to interoperable mobile data services. We believe that common mobile data standards will both improve the quality of data service and simplify the systems for manufacturers, data users, and service providers.

Dean, Richard A.; Levesque, Allen H.

1991-01-01

471

Rapidity gaps and scaling in high energy interactions  

SciTech Connect

The rapidity gap probability is investigated in varying symmetric bin sizes in proton-nucleus interactions at 800 GeV. It shows a scaling behavior and confirms the linked pair approximation for the {ital n}-particle cumulant correlation functions to high order. A comparison of the scaled rapidity gap probability is made with the negative binomial distribution. We also interpret the rapidity gap probability in the clan production model of hadronization and reanalyze the clan parameters in its light. {copyright} {ital 1996 The American Physical Society.}

Malik, S. [Department of Physics and Astrophysics, University of Delhi, Delhi-110007 (India)] [Department of Physics and Astrophysics, University of Delhi, Delhi-110007 (India)

1996-09-01

472

Waste Toolkit A-Z Mobile phones  

E-print Network

Waste Toolkit A-Z Mobile phones How to recycle your mobile phone Recycling your mobile phone makes box or waste bin ­ as they contain hazardous materials Mobiles must be recycled through a hazardous waste company Most mobile phone shops recycle old mobiles, so you can either take your old mobile

Melham, Tom

473

Rapid road repair vehicle  

DOEpatents

Disclosed is a rapid road repair vehicle capable of moving over a surface to be repaired at near normal posted traffic speeds to scan for and find an the high rate of speed, imperfections in the pavement surface, prepare the surface imperfection for repair by air pressure and vacuum cleaning, applying a correct amount of the correct patching material to effect the repair, smooth the resulting repaired surface, and catalog the location and quality of the repairs for maintenance records of the road surface. The rapid road repair vehicle can repair surface imperfections at lower cost, improved quality, at a higher rate of speed than was was heretofor possible, with significantly reduced exposure to safety and health hazards associated with this kind of road repair activities in the past.

Mara, Leo M. (Livermore, CA)

1998-01-01

474

Rapid road repair vehicle  

DOEpatents

Disclosed is a rapid road repair vehicle capable of moving over a surface to be repaired at near normal posted traffic speeds to scan for and find at the high rate of speed, imperfections in the pavement surface, prepare the surface imperfection for repair by air pressure and vacuum cleaning, applying a correct amount of the correct patching material to effect the repair, smooth the resulting repaired surface, and catalog the location and quality of the repairs for maintenance records of the road surface. The rapid road repair vehicle can repair surface imperfections at lower cost, improved quality, at a higher rate of speed than was not heretofor possible, with significantly reduced exposure to safety and health hazards associated with this kind of road repair activities in the past. 2 figs.

Mara, L.M.

1998-05-05

475

Rapid wetting dynamics  

NASA Astrophysics Data System (ADS)

Contact lines between solids and liquid or gas interfaces appear in very many instances of fluid flows. This could be coffee stains, water-oil mixtures in oil recovery, hydrophobic feet of insects or leaves in nature. In the present work we elucidate some of the wetting physics governing the very rapid wetting. Experimental and numerical results of spontaneously spreading droplets are presented, where focus is directed towards understanding the very rapid flow regime and highly dynamic initial wetting phase, where the contact line speed is limited by dissipative processes on a molecular scale occurring at the contact line. In particular we show the influence of the surface wettability and the liquid viscosity on the spreading dynamics, such as the contact line motion and dynamic contact angle in time.

Carlson, Andreas; Bellani, Gabriele; Amberg, Gustav

2010-11-01

476

Erraticity of Rapidity Gaps  

E-print Network

The use of rapidity gaps is proposed as a measure of the spatial pattern of an event. When the event multiplicity is low, the gaps between neighboring particles carry far more information about an event than multiplicity spikes, which may occur very rarely. Two moments of the gap distrubiton are suggested for characterizing an event. The fluctuations of those moments from event to event are then quantified by an entropy-like measure, which serves to describe erraticity. We use ECOMB to simulate the exclusive rapidity distribution of each event, from which the erraticity measures are calculated. The dependences of those measures on the order of $q$ of the moments provide single-parameter characterizations of erraticity.

Rudolph C. Hwa; Qing-hui Zhang

1999-12-08

477

Erraticity of rapidity gaps  

SciTech Connect

The use of rapidity gaps is proposed as a measure of the spatial pattern of an event. When the event multiplicity is low, the gaps between neighboring particles carry far more information about an event than multiplicity spikes, which may occur very rarely. Two moments of the gap distribution are suggested for characterizing an event. The fluctuations of those moments from event to event are then quantified by an entropy-like measure, which serves to describe erraticity. We use ECOMB to simulate the exclusive rapidity distribution of each event, from which the erraticity measures are calculated. The dependences of those measures on the order q of the moments provide single-parameter characterizations of erraticity. (c) 2000 The American Physical Society.

Hwa, Rudolph C. [Institute of Theoretical Science and Department of Physics, University of Oregon, Eugene, Oregon 97403-5203 (United States)] [Institute of Theoretical Science and Department of Physics, University of Oregon, Eugene, Oregon 97403-5203 (United States); Zhang, Qing-hui [Institute of Theoretical Science and Department of Physics, University of Oregon, Eugene, Oregon 97403-5203 (United States)] [Institute of Theoretical Science and Department of Physics, University of Oregon, Eugene, Oregon 97403-5203 (United States)

2000-07-01

478

iZone: A Location-Based Mobile Social Networking System  

E-print Network

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.

Cheng, Rui; Xia, Feng

2010-01-01

479

Nonlinear frequency shifts in acoustical resonators with varying cross sections.  

PubMed

The frequency response and nonlinear resonance frequency shift of an acoustical resonator with losses and having a varying cross section were investigated previously using Lagrangian mechanics and perturbation for resonator shapes that are close to cylindrical [M. F. Hamilton, et al., J. Acoust. Soc. Am. 110, 109-119 (2001)]. The same approach is extended here to include resonators having any shape for which the Webster horn equation is a valid model in the linear approximation. Admissible shapes include cones and bulbs proposed for acoustical compressors. The approach is appropriate for approximate but rapid parameter estimations for resonators with complicated shapes, requiring far less computation time than for direct numerical solution of the one-dimensional model equation frequently used for such resonators [Ilinskii et al., J. Acoust. Soc. Am. 104, 2664-2674 (1998)]. Results for cone and bulb shaped resonators with losses are compared with results from the direct numerical solution. The direction of the resonance frequency shift is determined by the efficiency of second-harmonic generation in modes having natural frequencies below versus above the frequency of the second harmonic, and how the net effect of this coupling compares with the frequency shifts due to cubic nonlinearity and static deformation. PMID:19275288

Hamilton, Mark F; Ilinskii, Yurii A; Zabolotskaya, Evgenia A

2009-03-01

480

Spatially Varying Determinants of Farmland Conversion Across Qiantang Watershed, China  

NASA Astrophysics Data System (ADS)

This paper employed geographically weighted regression (GWR) to characterize the determinants of farmland conversion at administrative scale between 1994 and 2003 across Qiantang watershed, China. Six determinants were identified: total area of forest, distance to highway, distance to second road, distance to river, population, and gross domestic product. Relationships between these identified determinants and farmland conversion showed great spatial non-stationarity, since their character, nature, and strength varied significantly across space. Typically, for cities whose development was heavily relied on road infrastructure development, the impacts of "distance to second road" and "distance to river" was negative. However, in mountainous areas, the restriction of terrain factors led to positive impacts from these two variables. For areas undergoing rapid socio-economic development, farmland conversion was accelerated by population growth and economic development. However, for more urbanized regions, a slow-down rate of farmland conversion would be expected. Our study highlighted that the problem of spatial non-stationarity should be addressed when qualifying the determinants of farmland conversion. Linking our results within the context of farmland protection, we argue that implementing local-specific land management practices, instead of the current one-size-fits-all framework, is the key for the success of farmland protection in China.

Su, Shiliang; Xiao, Rui

2013-10-01

481

Novel Deployment Schemes for Mobile Sensor Networks  

PubMed Central

Virtual Force Algorithm (VFA) is becoming a main solution to area coverage for homogeneous wireless sensor networks with random distribution of mobile sensor nodes. Consider the factors of the convergence, the boundary in Region Of Interest (ROI), effective distance of acting force and useless moving, etc, VFA is improved to overcome the above problems. Furthermore, an expression of exponential function for the relationship of virtual force is proposed to converge rapidly. Extensive simulation results indicate that these improved VFA get better performance in coverage rate, moving energy consumption, convergence etc. than original VFA.

Chen, Jiming; Li, Shijian; Sun, Youxian

2007-01-01

482

Rapidly refuelable fuel cell  

DOEpatents

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.

Joy, R.W.

1982-09-20

483

Stereolithography and Rapid Prototyping  

Microsoft Academic Search

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

David W. Rosen

484

Light disappears rapidly (exponentially)  

E-print Network

#12;#12;#12;#12;Light disappears rapidly (exponentially) with depth At the same time, the color of the light shifts #12;#12;#12;#12;· Euphotic zone ­ plentiful light ­ 0-100 m (about) · Dysphotic zone ­ very, very little light ­ 100-1000 m (about) · Aphotic zone ­ no light ­ below 1000 m #12;Sunlight in Water

Kudela, Raphael M.

485

Rapidity Gaps Between Jets  

Microsoft Academic Search

An excess of events with a rapidity gap between jets, over what would be\\u000aexpected from non-diffractive processes, has been observed at HERA. A process\\u000abased on a perturbative QCD calculation of colour singlet exchange has been\\u000aadded to HERWIG. With this addition, HERWIG is able to describe the number of\\u000aevents with a gap between jets over the number

J. M. Butterworth; M. E. Hayes; M. H. Seymour; L. E. Sinclair

1996-01-01

486

Localizing mobile RF targets using multiple unmanned aerial vehicles with heterogeneous sensing capabilities  

Microsoft Academic Search

In this paper, we consider the problem of locating a mobile radio frequency (RF) target using multiple unmanned aerial vehicles (UAVs) equipped with sensors with varying accuracies. We investigate the localization task performance as we vary (1) the configuration of multiple UAVs (sensor locations), (2) the type of sensors onboard the UAVs, and (3) the sensor sequence. We use the

Daniel Pack; George York; Gregory Toussaint

2005-01-01

487

Mobility Reversal of Polyelectrolyte-Grafted Colloids in Monovalent Salt Solutions  

NASA Astrophysics Data System (ADS)

We present molecular dynamics simulations on the electrophoresis of a negative colloid grafted with positive polyelectrolytes. Net-neutral colloids show a varying mobility in monovalent salt. For colloids with negative net charge the mobility is negative at low and positive at high salt concentrations. This mobility reversal is an electrokinetic effect, and thus different from that observed in multivalent salt. Our results agree with numerical calculations based on the Darcy-Brinkman formalism, with which we predict the mobility reversal to also occur for experimentally accessible colloids.

Raafatnia, Shervin; Hickey, Owen A.; Holm, Christian

2014-12-01

488

Rapid Coarsening of Ion Beam Ripple Patterns by Defect Annihilation  

SciTech Connect

Ripple patterns formed on Pt(111) through grazing incidence ion beam erosion coarsen rapidly. At and below 450 K coarsening of the patterns is athermal and kinetic, unrelated to diffusion and surface free energy. Similar to the situation for sand dunes, coarsening takes place through annihilation reactions of mobile defects in the pattern. The defect velocity derived on the basis of a simple model agrees quantitatively with the velocity of monatomic steps illuminated by the ion beam.

Hansen, Henri; Messlinger, Sebastian; Stoian, Georgiana [I. Physikalisches Institut, RWTH Aachen, 52056 Aachen (Germany); Redinger, Alex [I. Physikalisches Institut, RWTH Aachen, 52056 Aachen (Germany); II. Physikalisches Institut, Universitaet zu Koeln, 50937 Koeln, Zuelpicher Strasse 77 (Germany); Krug, Joachim [Institut fuer Theoretische Physik, Universitaet zu Koeln, 50937 Koeln, Zuelpicher Strasse 77 (Germany); Michely, Thomas [II. Physikalisches Institut, Universitaet zu Koeln, 50937 Koeln, Zuelpicher Strasse 77 (Germany)

2009-04-10

489

Rapid adhesive bonding concepts  

NASA Technical Reports Server (NTRS)

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.

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

1984-01-01

490

Rapid frequency scan EPR.  

PubMed

In rapid frequency scan EPR with triangular scans, sufficient time must be allowed to insure that the magnetization in the x, y plane decays to baseline at the end of the scan, which typically is about 5T(2) after the spins are excited. To permit relaxation of signals excited toward the extremes of the scan the total scan time required may be much longer than 5T(2). However, with periodic, saw-tooth excitation, the slow-scan EPR spectrum can be recovered by Fourier deconvolution of data recorded with a total scan period of 5T(2), even if some spins are excited later in the scan. This scan time is similar to polyphase excitation methods. The peak power required for either polyphase excitation or rapid frequency scans is substantially smaller than for pulsed EPR. The use of an arbitrary waveform generator (AWG) and cross loop resonator facilitated implementation of the rapid frequency scan experiments reported here. The use of constant continuous low B(1), periodic excitation waveform, and constant external magnetic field is similar to polyphase excitation, but could be implemented without the AWG that is required for polyphase excitation. PMID:21664848

Tseitlin, Mark; Rinard, George A; Quine, Richard W; Eaton, Sandra S; Eaton, Gareth R

2011-08-01

491

Memristive biosensors under varying humidity conditions.  

PubMed

We attempt to examine the potential of silicon nanowire memristors in the field of nanobiosensing. The memristive devices are crystalline Silicon (Si) Nanowires (NWs) with Nickel Silicide (NiSi) terminals. The nanowires are fabricated on a Silicon-on-Insulator (SOI) wafer by an Ebeam Lithography Technique (EBL) process that allows high resolution at the nanoscale. A Deep Reactive Ion Etching (DRIE) technique is used to define free-standing nanowires. The close alignment between Silicon (Si) and Nickel-Silicide (NiSi) terminals forms a Schottky-barrier at their junction. The memristive effect of the fabricated devices matches well with the memristor theory. An equivalent circuit reproducing the memristive effect in current-voltage (I-V) characteristics of our silicon nanowires is presented too. The memristive silicon nanowire devices are then functionalized with anti-human VEGF (Vascular Endothelial Growth Factor) antibody and I-V characteristics are examined for the nanowires prior to and after protein functionalization. The uptake of bio-molecules linked to the surface of the memristive NWs is confirmed by the increased voltage gap in the hysteresis curve. The effects of varying humidity conditions on the conductivity of bio-modified memristive silicon nanowires are deeply investigated. PMID:24594511

Puppo, Francesca; Dave, Akshat; Doucey, Marie-Agnès; Sacchetto, Davide; Baj-Rossi, Camilla; Leblebici, Yusuf; De Micheli, Giovanni; Carrara, Sandro

2014-03-01

492

Time-varying Dynamical Star Formation Rate  

NASA Astrophysics Data System (ADS)

We present numerical evidence of dynamic star formation in which the accreted stellar mass grows superlinearly with time, roughly as t 2. We perform simulations of star formation in self-gravitating hydrodynamic and magnetohydrodynamic turbulence that is continuously driven. By turning the self-gravity of the gas in the simulations on or off, we demonstrate that self-gravity is the dominant physical effect setting the mass accretion rate at early times before feedback effects take over, contrary to theories of turbulence-regulated star formation. We find that gravitational collapse steepens the density profile around stars, generating the power-law tail on what is otherwise a lognormal density probability distribution function. Furthermore, we find turbulent velocity profiles to flatten inside collapsing regions, altering the size-line width relation. This local flattening reflects enhancements of turbulent velocity on small scales, as verified by changes to the velocity power spectra. Our results indicate that gas self-gravity dynamically alters both density and velocity structures in clouds, giving rise to a time-varying star formation rate. We find that a substantial fraction of the gas that forms stars arrives via low-density flows, as opposed to accreting through high-density filaments.

Lee, Eve J.; Chang, Philip; Murray, Norman

2015-02-01

493

Serotonin release varies with brain tryptophan levels  

NASA Technical Reports Server (NTRS)

This study examines directly the effects on serotonin release of varying brain tryptophan levels within the physiologic range. It also addresses possible interactions between tryptophan availability and the frequency of membrane depolarization in controlling serotonin release. We demonstrate that reducing tryptophan levels in rat hypothalamic slices (by superfusing them with medium supplemented with 100 microM leucine) decreases tissue serotonin levels as well as both the spontaneous and the electrically-evoked serotonin release. Conversely, elevating tissue tryptophan levels (by superfusing slices with medium supplemented with 2 microM tryptophan) increases both the tissue serotonin levels and the serotonin release. Serotonin release was found to be affected independently by the tryptophan availability and the frequency of electrical field-stimulation (1-5 Hz), since increasing both variables produced nearly additive increases in release. These observations demonstrate for the first time that both precursor-dependent elevations and reductions in brain serotonin levels produce proportionate changes in serotonin release, and that the magnitude of the tryptophan effect is unrelated to neuronal firing frequency. The data support the hypothesis that serotonin release is proportionate to intracellular serotonin levels.

Schaechter, Judith D.; Wurtman, Richard J.

1990-01-01

494

Pediatric lupus: varied haematological picture and presentation.  

PubMed

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

Thakur, Neha; Chandra, Jagdish; Dhingra, Bhavna; Singh, V

2015-03-01

495

Mapping Oyster Reef Habitats in Mobile Bay  

NASA Technical Reports Server (NTRS)

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.

Bolte, Danielle

2011-01-01

496

MOBILE TARGET ADVERTISING FOR MOBILE USER  

Microsoft Academic Search

The wireless handhold device has become increasingly popular in the whole world. It has not only brought us convenient communication in lifestyle, but also changed many aspects of existing industries and generated new opportunities with new business models. As the result of the rapid development in the digital technology, customers are used to having various options in receiving information via

Shu-Cging Wang; Kuo-Qin Yan; Chia-Hui Wei

2004-01-01

497

Mobile systems capability plan  

SciTech Connect

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.

NONE

1996-09-01

498

Chromatography with two mobile phases.  

PubMed

Experimental results for the investigation of chromatographic columns containing two mobile phases are presented. The eluent was composed of mixtures of methanol and carbon dioxide. The column was an uncoated fused-silica-lined stainless steel capillary column. At certain experimental conditions, the eluent divided into two phases, both of which moved through the column. The predominant component of the liquid phase was methanol whereas the gas phase was composed of at least 93 mol % CO2. The columns were studied over a range of feed compositions (45-95 mol % CO2), pressures (61-101 bar), and temperatures (30-100 degrees C). The compositions and densities of each phase were calculated from the Peng-Robinson equation of state. The residence times of the two mobile phases were determined by tracer pulse chromatography. The partition coefficients of a probe solute, benzene, were measured along with the retention times of neon and the total volume of the chromatographic column as a function of temperature, pressure, and stoichiometric feed composition. The calculated column volumes, that is the volume of the liquid and gas, were constant over the full range of feed composition. The partition coefficient of benzene was constant at fixed pressure and temperature, varied logarithmically with density at fixed temperature and feed composition, and displayed a maximum at intermediate temperatures at fixed pressure and feed composition. The measured retention times of neon were consistently equivalent to the calculated residence times of the gas phase, indicating that neon did not dissolve in the liquid phase and could thus serve as an accurate dead time marker. The implementation of chromatography with two mobile phases produces a chromatographic "window". There is a lower limit for the retention volume of all solutes, viz., the residence time of the gas phase, exactly the same as normal chromatography. However, elimination of the stationary phase produces an upper limit to the retention volumes of solutes. This upper limit is the residence time of the liquid phase, so there is a retention window such that tG < or = ti < or = tL for all solutes. PMID:16478118

Wang, M; Hou, S; Parcher, J F

2006-02-15

499

Throughput Optimization in Mobile Backbone Networks  

E-print Network

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, ...

Craparo, Emily M.

500

An aeronautical mobile satellite experiment  

NASA Technical Reports Server (NTRS)

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.

Jedrey, T. C.; Dessouky, K. I.; Lay, N. E.

1990-01-01