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1

Periodic Integrating Device for Measurement of Rapidly Varying Count Rates  

Microsoft Academic Search

A device for the measurement of rapidly varying counting rates is described. The input signals, which need not be of constant size or shape, are converted into pulses of constant width and constant current. The pulses are applied to an integrating capacitor where, at the end of an integral period, the voltage of integration is sampled and stored. The sample

Cassimer M. Kukla

1967-01-01

2

Time-varying human mobility patterns with metapopulation epidemic dynamics  

NASA Astrophysics Data System (ADS)

In this paper, explicitly considering the influences of an epidemic outbreak on human travel, a time-varying human mobility pattern is introduced to model the time variation of global human travel. The impacts of the pattern on epidemic dynamics in heterogeneous metapopulation networks, wherein each node represents a subpopulation with any number of individuals, are investigated by using a mean-field approach. The results show that the pattern does not alter the epidemic threshold, but can slightly lower the final average density of infected individuals as a whole. More importantly, we also find that the pattern produces different impacts on nodes with different degree, and that there exists a critical degree kc. For nodes with degree smaller than kc, the pattern produces a positive impact on epidemic mitigation; conversely, for nodes with degree larger than kc, the pattern produces a negative impact on epidemic mitigation.

Gong, Yong-Wang; Song, Yu-Rong; Jiang, Guo-Ping

2013-10-01

3

Least-Squares Channel Estimation for Mobile OFDM Communication on Time-Varying Frequency-Selective Fading Channels  

Microsoft Academic Search

A least-squares (LS) channel estimation (CE) technique for mobile orthogonal frequency-division multiplexing (OFDM) communications over a rapidly time-varying frequency-selective fading channel is investigated in this paper. The proposed technique keeping the comb-type pilot arrangement can achieve a low error probability by accurately estimating channel impulse response (CIR) and effectively tracking rapid CIR time variations. The LS CE technique proposed here

Jia-Chin Lin

2008-01-01

4

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

5

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

6

Excess delay estimation from time-varying mobile radio channel impulse response measurements  

Microsoft Academic Search

This letter proposes a method for estimating the instantaneous excess delay in time-varying mobile radio channel impulse response measurement data using image processing techniques. The method is shown by example to produce more accurate mean power delay profiles than those produced assuming either constant or linearly varying excess delay

Alan J. Coulson; Ramakrishna Kakarala

1999-01-01

7

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

8

Further results on strict Lyapunov functions for rapidly time-varying nonlinear systems  

Microsoft Academic Search

We explicitly construct global strict Lyapunov functions for rapidly time-varying nonlinear control systems. The Lyapunov functions we construct are expressed in terms of oftentimes more readily available Lyapunov functions for the limiting dynamics which we assume are uniformly globally asymptotically stable. This leads to new sufficient conditions for uniform global exponential, uniform global asymptotic, and input-to-state stability of fast time-varying

Frederic Mazenc; Michael Malisoff; Marcio S. De Queiroz

2006-01-01

9

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

10

Rapid Naming Speed and Reading across Languages that Vary in Orthographic Consistency  

ERIC Educational Resources Information Center

The objective of this study was to examine how rapid naming speed is related to reading ability across languages that vary in orthographic consistency. Forty English-speaking Canadian children, 40 Greek-speaking Cypriot children, and 40 Chinese-speaking Taiwanese children were administered RAN, reading accuracy, and reading fluency tasks in grade…

Georgiou, George K.; Parrila, Rauno; Liao, Chen-Huei

2008-01-01

11

Particle simulation of the time-dependent interaction with the ionosphere of rapidly varying lightning EMP  

Microsoft Academic Search

The interaction with the lower ionosphere of rapidly varying electromagnetic pulses (EMPs) produced by lightning discharges is studied. The nonlinear heating, ionization and optical emission production are modeled using the Monte Carlo technique, which allows for consideration of realistic lightning EMPs with a few mus rise times. Results indicate that the electron distribution function is highly anisotropic during the first

Vyacheslav S. Glukhov; Umran S. Inan

1996-01-01

12

Particle simulation of the time-dependent interaction with the ionosphere of rapidly varying lightning EMP  

Microsoft Academic Search

The interaction with the lower ionosphere of rapidly varying electromagnetic pulses (EMPs) produced by lightning discharges is studied. The nonlinear heating, ionization and optical emission production are modeled using the Monte Carlo technique, which allows for consideration of realistic lightning EMPs with a few ?s rise times. Results indicate that the electron distribution function is highly anisotropic during the first

Vyacheslav S. Glukhov; Umran S. Inan

1996-01-01

13

Rapid calculation of the periodic steady state for electronically switched, time varying power system loads  

SciTech Connect

The periodic steady state of power distribution system loads is studied for the electronically switched, time varying cases. Many loads of this type appear on contemporary power systems as energy saving and controllable demands. Several alternative methods of calculating the periodic steady state are discussed and new method is proposed based on the frequency modulation property of the discrete Fourier transform. The new method is termed the gain-shift formula (GSF) because the format of the technique entails adding frequency shifted terms which represent the parameter to be calculated. An example of a triac switched load on the distribution system is given. The main advantages of the GSF are: rapid calculation of the periodic steady state and efficient calculation of the frequency spectrum of voltages and currents in the periodic steady state.

Heydt, G.T. [Arizona State Univ., Tempe, AZ (United States). Center for Power Quality; Jun, J. [Purdue Univ., West Lafayette, IN (United States). School of Electrical and Computer Engineering

1996-10-01

14

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

PubMed

Design features of mobile computing technology such as device size and key location may affect thumb motor performance during single-handed use. Since single-handed use requires the thumb posture to vary with key location, we hypothesize that motor performance is associated with thumb and wrist joint postures. A repeated measures laboratory experiment of 10 right-handed participants measured thumb and wrist joint postures during reciprocal tapping tasks between two keys for different key pairs among 12 emulated keys. Fitts' effective index of performance and joint postures at contact with each key were averaged across trials for each key. Thumb motor performance varied for different keys, with poorest performances being associated with excessive thumb flexion such as when tapping on keys closest to the base of the thumb in the bottom right corner of the phone. Motor performance was greatest when the thumb was in a typical resting posture, neither significantly flexed nor fully extended with slight CMC joint abduction and supination, such as when tapping on keys located in the top right and middle left areas on the phone. Grip was also significantly affected by key location, with the most extreme differences being between the top left and bottom right corners of the phone. These results suggest that keypad designs aimed at promoting performance for single-handed use should avoid placing frequently used functions and keys close to the base of the thumb and instead should consider key locations that require a thumb posture away from its limits in flexion/extension, as these postures promote motor performance. PMID:22858316

Trudeau, Matthieu B; Young, Justin G; Jindrich, Devin L; Dennerlein, Jack T

2012-08-01

15

Large-timestep techniques for particle-in-cell simulation of systems with applied fields that vary rapidly in space.  

National Technical Information Service (NTIS)

Under conditions which arise commonly in space-charge-dominated beam applications, the applied focusing, bending, and accelerating fields vary rapidly with axial position, while the self-fields (which are, on average, comparable in strength to the applied...

A. Friedman D. P. Grote

1996-01-01

16

Sydewynder: rapid prototyping for mobile mixed-reality games  

Microsoft Academic Search

Sydewynder is an open-source SMS receiver and sender application written in Python for the Nokia S60 phones. It can automate the responses of messages and can be used as a mobile application server in areas where setting up a traditional server may be difficult or illegal. It also is very useful for prototyping mobile applications, such as games, without the

Michael J. Edwards; Joana Kelly; Michael Thibodeau

2008-01-01

17

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

18

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

19

Is bigger really better? Comparison of rapid decompression experiments using varying sample sizes  

NASA Astrophysics Data System (ADS)

Rapid decompression of pressurized volcanic systems is one of the key factors causing explosive eruptions. During eruption, the mixture of melt, crystals and bubbles comprising the magma in the conduit is exposed to high strain rates. If the strain rate approaches the structural relaxation time of the melt, brittle fragmentation will occur. The rate of decompression controls the strain rate and thereby determines whether an explosive event is triggered. Several studies have investigated rapid decompression of natural volcanic rocks using sample sizes ranging from 17 mm to 26 mm diameter. This increase in sample size enables the use of samples containing elements such as vesicles and phenocrysts of order of a few mm in size. For samples with larger phenocrysts, the experimental response of samples of this size range to rapid decompression is significantly compromised by the behaviour of these large crystals. However, large phenocrysts and particularly large vesicles are quite common in volcanic rocks. Thus, to cope with these samples experimentally, we developed an experimental set-up that enables the use of sample diameters up to 60 mm. Comparison to the results from smaller samples sizes allows us to evaluate the impact of boundary conditions and sample size itself on fragmentation behaviour (threshold, speed and efficiency). We performed experiments on samples from Lipari (Italy), Mt.Merapi (Indonesia) and Mt.Yasur (Vanuatu) that cover a large range in connected porosity, namely 18 - 78 %. All rapid decompression experiments were conducted at room temperature in a pressure range from 2 - 10 MPa. In a first series of experiments we analysed the fragmentation threshold, in a second series we determined fragmentation speed and grain-size distribution for each experiment. Additionally, we were able to estimate the velocity of the particles ejected after fragmentation using a high-speed camera. The results are discussed in the light of data from recent studies using smaller sample diameters. Further we evaluate the influence of varying decompression rates on the experiments. Finally we apply an energy budget model providing a link between the fragmentation process and the particle velocity.

Kremers, S. B.; Barsu, S.; Scheu, B.; Dingwell, D. B.

2011-12-01

20

Large-timestep techniques for particle-in-cell simulation of systems with applied fields that vary rapidly in space  

Microsoft Academic Search

Under conditions which arise commonly in space-charge-dominated beam applications, the applied focusing, bending, and accelerating fields vary rapidly with axial position, while the self-fields (which are, on average, comparable in strength to the applied fields) vary smoothly. In such cases it is desirable to employ timesteps which advance the particles over distances greater than the characteristic scales over which the

A. Friedman; D. P. Grote

1996-01-01

21

Large-timestep techniques for particle-in-cell simulation of systems with applied fields that vary rapidly in space  

Microsoft Academic Search

Under conditions which arise commonly in space-charge-dominated beam applications, the applied focusing, bending, and accelerating fields vary rapidly with axial position, while the self-fields (which are, on average, comparable in strength to the applied fields) vary smoothly. In such cases it is desirable to employ timesteps which advance the particles over distances greater than the characteristic scales over which the

Alex Friedman; David P. Grote

1997-01-01

22

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

Microsoft Academic Search

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

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

2004-01-01

23

The effect of rapidly varying contact stress fields on fretting fatigue  

Microsoft Academic Search

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

J. A Araújo; D Nowell

2002-01-01

24

Large-timestep techniques for particle-in-cell simulation of systems with applied fields that vary rapidly in space  

SciTech Connect

Under conditions which arise commonly in space-charge-dominated beam applications, the applied focusing, bending, and accelerating fields vary rapidly with axial position, while the self-fields (which are, on average, comparable in strength to the applied fields) vary smoothly. In such cases it is desirable to employ timesteps which advance the particles over distances greater than the characteristic scales over which the applied fields vary. Several related concepts are potentially applicable: sub-cycling of the particle advance relative to the field solution, a higher-order time-advance algorithm, force-averaging by integration along approximate orbits, and orbit-averaging. We report on our investigations into the utility of such techniques for systems typical of those encountered in accelerator studies for heavy-ion beam-driven inertial fusion.

Friedman, A.; Grote, D.P.

1996-10-01

25

Charged particle motion in electromagnetic fields varying moderately rapidly in space  

SciTech Connect

Electromagnetic fields are considered which vary on the space scale of the geometric mean of the Larmor radius and the much larger scale length of variation of the magnetic field lines. It is first shown that the magnetic moment is an adiabatic invariant, even though the usual arguments for its existence fail. The motion of the guiding center is then examined. For perpendicular drifts in magnitude comparable with the particle speed, the subsequent motion is dominated by electrostatic effects. The motion of particles along the field lines occurs on a much slower time scale than the perpendicular drift time scale. When the guiding center motion is approximately periodic in time, a second adiabatic invariant exists, the magnetic flux enclosed by the almost periodic orbit. When the perpendicular drift is small compared with the particle speed, the parallel motion and the perpendicular drift occur on the same, slow timescale.

Jagannath, Aukosh; Weitzner, Harold [Courant Institute of Mathematical Sciences, New York University, New York, New York 10012 (United States)

2011-10-15

26

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.

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

2013-01-01

27

An offline mobile nutrition monitoring intervention for varying-literacy patients receiving hemodialysis: a pilot study examining usage and usability  

PubMed Central

Objective Design and evaluation of the dietary intake monitoring application (DIMA) to assist varying-literacy patients receiving hemodialysis to adhere to their prescribed dietary regimen. Methods An iterative, user-centered design process informed by Bandura's social cognitive theory was employed to design DIMA—a mobile application that utilizes touch-screen, visual interfaces; barcode scanning; and voice recording to assist varying-literacy patients receiving hemodialysis to self-monitor their diet. A pilot field study was conducted where 18 patients receiving hemodialysis were recruited face-to-face from two dialysis facilities to use DIMA for 6?weeks. Subjects recorded their dietary intake using DIMA and met with research assistants three times each week. All interactions with DIMA were logged. Subjects' interdialytic weight gain was recorded throughout the study. At the end of the study, two face-to-face questionnaires were administered to assess usability and context of use. Results Subjects were able to use DIMA successfully—12 subjects used DIMA as much or more at the end of the study as they did at the beginning and reported that DIMA helped them change their diet. Subjects had difficulty using the barcode scanner. Viewing past meals was the most used of the reflection mechanisms in DIMA. Conclusion Results suggest that while many design features were useful, some could be improved. In particular, future versions of DIMA will be on a smartphone using a camera for barcode scanning, integrate feedback and past meal reflection into the normal flow of the application, and support visual cues when selecting food items.

Siek, Katie A; Chaudry, Beenish; Jones, Josette; Astroth, Kim; Welch, Janet L

2012-01-01

28

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

2013-07-01

29

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

NASA Astrophysics Data System (ADS)

We have shown elsewhere [Tartakovsky and Neuman, this issue (a)] that in randomly heterogeneous media, the ensemble mean transient flux is generally nonlocal in space-time and therefore non-Darcian. We have also shown [Tartakovsky and Neuman, this issue (b)] that there are special situations in which this flux can be localized so as to render it Darcian in real or transformed domains. Each such situation gives rise to an effective hydraulic conductivity which relates mean gradient to mean flux at any point in real or transformed space-time. In this paper we develop first-order analytical expressions for effective hydraulic conductivity under three-dimensional transient flow through a box-shaped domain due to a mean hydraulic gradient that varies slowly in space and time. When the mean gradient varies rapidly in time, the Laplace transform of the mean flux is local but its real-time equivalent includes a temporal convolution integral; we develop analytical expressions for the real-time kernel of this convolution integral. The box is embedded within a statistically homogeneous natural log hydraulic conductivity field that is Gaussian and exhibits an anisotropic exponential spatial correlation structure. By the effective hydraulic conductivity of a finite box in such a field we imply the ensemble mean (expected value) of all random equivalent conductivities that one could associate with the box under these conditions. We explore the influence of domain size, time, and statistical anisotropy on effective conductivity and include a simple new formula for its variation with statistical anisotropy ratio in an infinite domain under steady state.

Tartakovsky, Daniel M.; Neuman, Shlomo P.

30

Control of Classical Swine Fever Epidemics Under Varying Conditions - With Special Focus on Emergency Vaccination and Rapid PCR Testing.  

PubMed

SUMMARY: In case of a classical swine fever outbreak in the European Union (EU), its control is based upon the culling of swine on infected farms, movement restrictions in the protection and surveillance zones, and contact tracing. Additionally, preventive culling may be carried out. Emergency vaccination and rapid PCR testing are discussed as alternatives to avoid this measure. An outbreak of classical swine fever and the success of its control are influenced by different factors. Using a spatial and temporal Monte-Carlo simulation model the control strategies 'Restriction Zone', 'Traditional Control', 'Emergency Vaccination', 'Test To Slaughter', 'Test To Control' and 'Vaccination in conjunction with Rapid Testing' were compared under various conditions. Farm density, compliance with movement restrictions and delay in the establishment of an emergency vaccination were analysed as influencing factors. It was found that all these factors had a significant influence on the number of infected and culled farms. In a low-density region, the basic measures are sufficient to control an epidemic, provided strict compliance with movement restrictions is adhered to. In a high-density region, additional measures are necessary. They can compensate non-strict compliance with movement restriction to a certain extent. In the high-density region, 'Emergency Vaccination' and 'Vaccination in conjunction with Rapid Testing' reached the same level of infected farms as 'Traditional Control', independent of the value of compliance with movement restrictions. However, in the case of an emergency vaccination, an early start to the vaccination campaign is essential for successful disease control. PMID:23113941

Brosig, J; Traulsen, I; Krieter, J

2012-11-01

31

Development and first flight of a sounding rocket payload to investigate the phenomena of rapidly varying space plasma  

NASA Astrophysics Data System (ADS)

NASA Goddard Space Flight Center, Wallops Flight Facility has developed, flown, and recovered a unique plasma physics payload. This sounding rocket payload was developed to measure varying aspects of Alfven's critical velocity effect in a space plasma by using conical-shaped barium explosives. These measurements could possibly duplicate conditions that existed in the early solar system. This paper provides details of the payload and subpayload development, with specific emphasis on the extensive dynamic analysis of the barium release modules. Other key elements which are expanded on in the paper are: (1) design, development, and testing acceptance for the science/inertia booms using a viscous damping system for high spin rate deployment; (2) vehicle dynamic analysis; (3) apogee and impact dispersion analysis to satisfy the science and NASA safety requirements; (4) a comparison of predicted versus actual flight events.

Buchanan, R. P.

1986-10-01

32

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

Microsoft Academic Search

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

Bonifaz Kaufmann; Leah Buechley

2010-01-01

33

Survivability of the Hardened Mobile Launcher When Attacked by a Hypothetical Rapidly Retargetable ICBM System.  

National Technical Information Service (NTIS)

This thesis evaluates the survivability of the hardened mobile launcher system (HML) against a hypothetical enemy ICBM system. The hypothetical system has two key capabilities: it can obtain near real-time intelligence information regarding the HML's loca...

D. J. Gearhart S. F. Merrow

1986-01-01

34

Measurement of space-charge distributions in solid insulators under rapidly varying voltage using the high-voltage, high-speed pulsed electro-acoustic (PEA) apparatus  

NASA Astrophysics Data System (ADS)

A new high-voltage, high-speed pulsed electro-acoustic (PEA) apparatus for real-time measurements of space-charge distribution in solid insulators subjected to rapidly varying voltages is described. Very high-rate PEA measurement is accomplished with the use of a high-speed real-time data acquisition module known as the `Eclipse' unit and a purpose-built high-voltage FET switch pulse generator. Real-time space-charge measurements with good phase resolving capability can be made under time varying applied stresses, e.g. voltage transients or ac conditions. The high-field PEA system has been used to investigate the space-charge dynamics in polyethylene samples stressed by 0.2 and 50 Hz sinusoidal ac voltages.

See, A.; Fothergill, J. C.; Dissado, L. A.; Alison, J. M.

2001-08-01

35

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

PubMed Central

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

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

2007-01-01

36

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

37

RAPID LIQUID CHROMATOGRAPHIC DETERMINATION OF TETRACYCLINES IN ANIMAL FEEDS USING A SURFACTANT SOLUTION AS MOBILE PHASE  

Microsoft Academic Search

A chromatographic procedure was developed for the determination of oxytetracycline (OTC), tetracycline (TC), chlortetracycline (CTC), doxycycline (DC) and minocycline (MINO) in animal feeds. Clear analyte-rich extracts were obtained using a 1 : 1 acetonitrile\\/water mixture buffered at pH 3. The extracts were injected into a conventional unprotected C18 chromatographic column and eluted with a mobile phase of 0.05 M sodium dodecyl sulfate\\/5% 1-butanol\\/0.01 M

R. D. Caballero; J. R. Torres-Lapasió; M. C. García-Alvarez-Coque; G. Ramis-Ramos

2002-01-01

38

Oil-In-Water Microemulsions as Mobile Phases for Rapid Screening of Illegal Drugs in Sports  

Microsoft Academic Search

Microemulsions are clear. stable and spontaneously forming liquid disperse systems. They contain an oil. water, a surfactant and a cosurfactant. The system heptane, water, sodium dodecylsulfate (SDS) and n-pentanol was used. The mass diagram was determined. Water rich compositions of the oil-in-water micioemulsion type (L1) were investigated as mobile phase in reversed phase liquid chromatography with a 5 ?m C18

A. Berthod; J. J. Laserna; I. Carretero

1992-01-01

39

Results from the Quake-Catcher Network Rapid Aftershock Mobilization Project (QCN-RAMP) in Christchurch, New Zealand and Advances in QCN Rapid Earthquake Detections  

NASA Astrophysics Data System (ADS)

Following the 4 September 2010 M7.1 Darfield earthquake in New Zealand, we initiated a QCN Rapid Aftershock Mobilization Project (RAMP). We rapidly installed 180 low-cost 14-bit USB Micro-Electro-Mechanical Systems (MEMS) accelerometers in less than a week in order to record aftershocks as many aftershocks as possible. Using data recorded by these stations, we began performing real-time tests of a rapid earthquake detection and characterization program that had been developed through retrospective testing of data collected during the M8.8 Maule, Chile RAMP deployment in early 2010 (Chung et al., 2011). QCN sensors recorded the M6.3 Christchurch event on 22 February 2011, and we used trigger information (station location, trigger time, and peak accelerations) to estimate the magnitude and location. In addition, we automatically produced a map of measured and predicted shaking intensities within 7 seconds of the earthquake origin time. Successive iterations improved the event characterization and, within 24 seconds of the earthquake, magnitude and location estimates were comparable to those provided by GNS. Using the wealth of data from this event as well as the following aftershocks, we continue to improve the detection and identification algorithms. Recent improvements include inverting data from all recorded events along with the GNS data from the same events to find an empirical relationship between peak ground motion at the time of the detection, station to event distance, and final magnitude. Whilst still in development, our preliminary results using the data collected from these and other QCN stations around the world suggest that MEMS sensors installed in homes, schools, and offices provide a way to dramatically increase the density of strong motion observations for use in seismic hazard analysis and earthquake early warning.

Chung, A. I.; Cochran, E. S.; Christensen, C.; Kaiser, A. E.; Lawrence, J. F.

2012-04-01

40

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

2013-05-08

41

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

42

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.

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

2013-01-01

43

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

2008-04-10

44

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

PubMed

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

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

2006-07-10

45

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

46

Survivability of the hardened mobile launcher when attacked by a hypothetical rapidly retargetable ICBM system. Master's thesis  

SciTech Connect

This thesis evaluates the survivability of the hardened mobile launcher system (HML) against a hypothetical enemy ICBM system. The hypothetical system has two key capabilities: it can obtain near real-time intelligence information regarding the HML's location, and it can be retargeted in flight (as necessary) according to the intelligence information. Thus, the hypothetical ICBM threat systems can attack individual HMLs directly rather than rely on a barrage attack against HML bases. Monte Carlo simulation is used to approach the problem. The model is an MBASIC computer program, written and runs on an Apple Macintosh computer. The model simulates the flight of the attacking ICBMs (there may be as few as one or as many as 14 warheads directed at each HML) and the random dispersal tactics of a single HML. The model determines the locations of the detonations and the location of the HML at time of detonation. Based on these locations, probability of kill due to peak-blast overpressure is calculated. A key parameter in the model is intelligence / retargeting cycle time -- the time required to obtain intelligence and retarget accordingly. This time is varied from 1-30 minutes. The model also allows variations in HML speed and hardness and threat system CEP. A subroutine for examining the effects of neutron fratricide on the attacking warheads is included (although the effects were found to be negligible). The thesis concludes that very small intelligence/retargeting cycle times are required for this to be an effective weapon system against the HML. Thus, with today's (or near future) technology, the HML can be considered a very survivable system.

Gearhart, D.J.; Merrow, S.F.

1986-03-01

47

Upregulation of TLR2 expression on G-CSF-mobilized peripheral blood stem cells is responsible for their rapid engraftment after allogeneic hematopoietic stem cell transplantation  

Microsoft Academic Search

Granulocyte colony-stimulating factor (G-CSF) mobilized peripheral blood stem cells (PBSCs) are more frequently used as the cellular source in allogeneic hematopoietic stem cell transplantation (HSCT) than bone marrow stem cells (BMSCs) because they promote more rapid engraftment and immune reconstitution. However, the underlying mechanism for this is not fully understood. Here, we investigated the role of Toll-like receptor 2 (TLR2)

Young-Don Joo; Won-Sik Lee; Hae-Jeong Won; Sun-Mi Lee; Jae-Hyeog Choi; Sang-Min Lee; Ki-Ho Han; Sae-Gwang Park; Il-Whan Choi; Su-Kil Seo

2011-01-01

48

Effect of neutron irradiation on the titanium carbide distribution in rapidly solidified austenitic stainless steels of varying titanium and carbon content  

Microsoft Academic Search

Titanium modified austenitic stainless steels are one of the prime candidate alloys being examined for irradiation performance for fusion applications. An aspect of considerable importance in the alloy design is the optimum distribution of titanium carbide in the preirradiation microstructure and the changes in distribution that occur upon irradiation. Rapid solidification (RS) techniques are being used to prepare materials, including

D. Imeson; C. H. Tong; J. B. Vander Sande; O. K. Harling

1982-01-01

49

Dynamic localization and averaging of the equations of motion of an electron with an arbitrary energy-momentum relation in rapidly varying and static electric fields  

SciTech Connect

Equations of motion are obtained for the average coordinates and momentum of an electron with an arbitrary energy-momentum relation in and rf electric field. Localization of an electron in time-varying electric fields random uniform and monochromatic is discussed. Localization in a nonuniform field is investigated using the equations derived in this paper. 6 refs.

Bass, F.G. [Institute of Radio Physics and Electronics, Khar`kov (Ukraine)

1995-09-01

50

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

51

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

PubMed

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

Karimi, Akarm; Alizadeh, Naader

2009-04-16

52

PBSC mobilization  

Microsoft Academic Search

Intentional recruitment of hematopoietic stem cells from bone marrow to peripheral blood is a clinical process termed peripheral blood stem cell (PSBC) mobilization. Mobilized PSBC has replaced bone marrow as the preferred source of stem cells for pateints undergoing high-dose chemotherapy because of rapid and durable engraftment and reconstitution of functional bone marrow. Although the mechanism involved in the process

Kunihiko Takeyama; Hitoshi Ohto

2004-01-01

53

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.

Museum, Chicago C.

2010-01-01

54

High electron concentration and mobility in Al-doped n-ZnO epilayer achieved via dopant activation using rapid-thermal annealing  

SciTech Connect

We report on the growth of very high-quality Al-doped n-type ZnO epilayers on sapphire substrates using a radio-frequency (rf) magnetron sputtering technique combined with a rapid-thermal annealing. Photoluminescence (PL) and Hall measurements show that both the optical and electrical properties of the ZnO layers are significantly improved with an increasing annealing temperature up to 900 deg. C. For example, the samples that are grown at 600 deg. C and a rf power of 100 W with an Ar/O{sub 2} gas ratio of 1 give an electron concentration of 1.83x10{sup 20} cm{sup 3} and a mobility of 65.6 cm{sup 2}/V s, when annealed at 900 deg. C for 3 min in a nitrogen ambient. Furthermore, x-ray diffraction measurements show that both the as-grown and annealed samples are of excellent crystallinity.

Kim, Kyoung-Kook; Niki, Shigeru; Oh, Jin-Yong; Song, June-O; Seong, Tae-Yeon; Park, Seong-Ju; Fujita, Shizuo; Kim, Sang-Woo [Thin Film Compound Semiconductor Team, Research Center for Photovoltaics, National Institute of Advanced Industrial Science and Technology, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8586 (Japan); Department of Materials Science and Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju 500-712 (Korea, Republic of); International Innovation Center, Kyoto University, Yoshida-honmachi, Sakyo, Kyoto 606-8501 (Japan); Department of Electronic Science and Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8501 (Japan)

2005-03-15

55

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

56

Rapid subsidence in the Nile delta and the effects of a mobile depositional surface on stratigraphic facies development  

SciTech Connect

Radiocarbon-dated late Quaternary sedimentary sections serve as a base to quantify high rates of subsidence in the northern Nile delta of Egypt. Measurements of recent vertical shifts of land relative to the sea, coupled with eustatic changes, are used to interpret temporal and spatial facies distribution patterns and delta lobe migration in the major recent depocenter in the eastern Mediterranean. The study is based largely on cores, collected during two drilling expeditions, which recovered material deposited during the past 30,000 years. These borings, plus an additional 50 core logs, allow good correlation for the region around Lake Manzala. There, variable thicknesses of Holocene marine and fluvio-marine units lie above transgressive coastal sands (upper Pleistocene to lower Holocene) and older alluvial delta-plain deposits. Mapping of these facies shows that the top of the transgressive sand becomes younger (to -- 7,000 years ago) and shallower toward the south of the present coastline. Progradation of delta lobes began about 8,000 years ago, and the coastline has advanced northward at a rate of approximately 1 km/100 years. Lake Manzala lies almost directly above, and is clearly related to, a 60-km long, narrow, linear northwest-southeast region of rapid subsidence; its axis trends parallel to, but is 10-15 km inland of, the present coastline. Holocene coastal and marine sediments lie at depths of 50 m, suggesting a lowering of land relative to the sea of about 40 cm per century. This linear zone, probably the surface expression of a growth fault, has been highly active during deposition. Similar neotectonic dislocation of sedimentary sections underlying the other lakes and lagoons in the northern delta is postulated. Facies patterns have been more extensively affected by rapid subsidence in the Nile delta than previously indicated.

Stanley, D.J.

1988-01-01

57

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

NASA Astrophysics Data System (ADS)

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

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

2010-12-01

58

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

59

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

Microsoft Academic Search

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

Preshious Rearden; Peter B. Harrington

2005-01-01

60

Requirements for mobile photoware  

Microsoft Academic Search

What is the future of digital imaging? Mobile imaging technologies have been changing rapidly and will continue to do so. We explore new developments in cam- eraphone photography with the goal of improving the design of the next generation of mobile imaging devices. We equipped 26 diverse participants with cameraphones, photo uploading and sharing software, and access to online photo-accounts

Morgan Ames; Dean Eckles; Mor Naaman; Mirjana Spasojevic; Nancy A. Van House

2010-01-01

61

Mobile Goes Mainstream  

ERIC Educational Resources Information Center

|Mobile learning--the use of mobile devices for educational purposes by students--is rapidly moving from an experimental initiative by a few innovative districts over the last five years to a broadly accepted concept in K12. The latest research and surveys, results of pilot programs, and analysis of trends in both public education and the broader…

Eisele-Dyrli, Kurt

2011-01-01

62

Rapid Buildup of Brain White Matter Hyperintensities Over 4 Years Linked to Ambulatory Blood Pressure, Mobility, Cognition, and Depression in Old Persons.  

PubMed

BACKGROUND: Brain white matter hyperintensities (WMH) are associated with functional decline in older people. We performed a 4-year cohort study examining progression of WMH, its effects on mobility, cognition, and depression with the role of clinic and 24-hour ambulatory systolic blood pressure as a predisposing factor. METHODS: Ninety-nine subjects, 75-89 years were stratified by age and mobility, with the 67 completing 4-years comprising the cohort. Mobility, cognition, depressive symptoms, and ambulatory blood pressure were assessed, and WMH volumes were determined by quantitative analysis of magnetic resonance images. RESULTS: WMH increased from 0.99±0.98% of intracranial cavity volume at baseline to 1.47±1.2% at 2 years and 1.74±1.30% after 4 years. Baseline WMH was associated with 4-year WMH (p < .0001), explaining 83% of variability. Small, but consistent mobility decrements and some evidence of cognitive decline were noted over 4 years. Regression analyses using baseline and 4-year WMHs were associated with three of five mobility measures, two of four cognitive measures and the depression scale, all performed at 4 years. Increases in ambulatory systolic blood pressure but not clinic systolic blood pressure during the initial 2 years were associated with greater WMH accrual during those years, while ambulatory systolic blood pressure was related to WMH at 4 years. CONCLUSION: Declines in mobility, cognition, and depressive symptoms were related to WMH accrual over 4 years, and WMH was related to out-of-office blood pressure. This suggests that prevention of microvascular disease, even in asymptomatic older persons, is fundamental for preserving function. There may be value in tighter 24-hour blood pressure control in older persons although this requires further investigation. PMID:23766429

Wolfson, Leslie; Wakefield, Dorothy B; Moscufo, Nicola; Kaplan, Richard F; Hall, Charles B; Schmidt, Julia A; Guttmann, Charles R G; White, William B

2013-06-13

63

Rapid separation of chlorophylls a and b and their demetallated and dephytylated derivatives using a monolithic silica C 18 column and a pyridine-containing mobile phase  

Microsoft Academic Search

A monolithic C18-bonded silica rod column (Merck Chromolith) was applied to the separation of mixtures of chlorophylls a and b and their derivatives originated by hydrolysis of the phytyl ester linkage (chlorophyllides), loss of the central Mg atom (pheophytins), or both processes (pheophorbides). Mobile phases containing two different ion-pair reagents, ammonium acetate and buffered pyridine, were tested. Both eluents achieved

José L. Garrido; Francisco Rodr??guez; Emilia Campaña; Manuel Zapata

2003-01-01

64

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

65

Theme-Based Mobile Social Network System  

Microsoft Academic Search

With the rapid development of mobile device and wireless network, mobile device becomes an excellent choice for people to access social life here and there all around the clock. However, most of widely used mobile social network systems cannot make the best of mobile device's features and hardly satisfied persons' demands in dynamic realistic social network. So this paper proposes

Jiamei Tang; Sangwook Kim

2011-01-01

66

Design a mobile website for university library  

Microsoft Academic Search

With the rapid progress of wireless internet technology and the internet-capable mobile phones, as a new kind of digital library service model, mobile phone library comes into our vision. This paper surveyed the mobile websites of several university libraries, sum up their functions and services. Based on this, the author proposed a general structure of mobile website for university library.

Qing Feng; Hui-lan Chen

2011-01-01

67

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

68

Time-Varying BRDFs  

Microsoft Academic Search

The properties of virtually all real-world materials change with time, causing their BRDFs to be time-varying. However, none of the existing BRDF models and databases take time variation into consideration; they represent the appearance of a material at a single time instance. In this work, we address the acquisition, analysis, modeling and rendering of a wide range of time-varying BRDFs.

Bo Sun; Kalyan Sunkavalli; Ravi Ramamoorthi; Peter N. Belhumeur; Shree K. Nayar

2007-01-01

69

Purinergic P2Y2 receptors mediate rapid Ca(2+) mobilization, membrane hyperpolarization and nitric oxide production in human vascular endothelial cells.  

PubMed

In blood vessels, stimulation of the vascular endothelium by the Ca(2+)-mobilizing agonist ATP initiates a number of cellular events that cause relaxation of the adjacent smooth muscle layer. Although vascular endothelial cells are reported to express several subtypes of purinergic P2Y and P2X receptors, the major isoform(s) responsible for the ATP-induced generation of vasorelaxant signals in human endothelium has not been well characterized. To address this issue, ATP-evoked changes in cytosolic Ca(2+), membrane potential and acute nitric oxide production were measured in isolated human umbilical vein endothelial cells (HUVECs) and profiled using established P2X and P2Y receptor probes. Whereas selective P2X agonist (i.e. ?,?-methyl ATP) and antagonists (i.e. TNP-ATP and PPADS) could neither mimic nor block the observed ATP-evoked cellular responses, the specific P2Y receptor agonist UTP functionally reproduced all the ATP-stimulated effects. Furthermore, both ATP and UTP induced intracellular Ca(2+) mobilization with comparable EC(50) values (i.e. 1-3?M). Collectively, these functional and pharmacological profiles strongly suggest that ATP acts primarily via a P2Y2 receptor sub-type in human endothelial cells. In support, P2Y2 receptor mRNA and protein were readily detected in isolated HUVECs, and siRNA-mediated knockdown of endogenous P2Y2 receptor protein significantly blunted the cytosolic Ca(2+) elevations in response to ATP and UTP, but did not affect the histamine-evoked response. In summary, these results identify the P2Y2 isoform as the major purinergic receptor in human vascular endothelial cells that mediates the cellular actions of ATP linked to vasorelaxation. PMID:21414662

Raqeeb, Abdul; Sheng, Jianzhong; Ao, Ni; Braun, Andrew P

2011-03-16

70

Influence of industrial contamination on mobile genetic elements: class 1 integron abundance and gene cassette structure in aquatic bacterial communities  

Microsoft Academic Search

The acquisition of new genetic material via horizontal gene transfer allows bacteria to rapidly evolve. One key to estimating the contribution of horizontal gene transfer to bacterial evolution is to quantify the abundance of mobile genetic elements (MGEs) in bacterial communities under varying degrees of selective pressure. We quantified class 1 integrase (intI1) gene abundance in total community DNA extracted

Meredith S Wright; Craig Baker-Austin; Angela H Lindell; Ramunas Stepanauskas; Hatch W Stokes; J Vaun McArthur

2008-01-01

71

Teleporting - Making Applications Mobile  

Microsoft Academic Search

Abstract The rapid emergence,of mobile computers,as a popu- lar, and increasingly powerful, computing tool is present- ing new challenges. This subject is already being widely addressed within the computing,literature. A complemen- tary and relatively unexplored notion of mobility is one in which application interfaces, rather than the computer on which the applications run, are able to move. The Teleporting System

Frazer Bennett; Tristan Richardson; Andy Harter

72

Dynamic planar solid phase microextraction-ion mobility spectrometry for rapid field air sampling and analysis of illicit drugs and explosives.  

PubMed

A preconcentration device that targets the volatile chemical signatures associated with illicit drugs and explosives (high and low) has been designed to fit in the inlet of an ion mobility spectrometer (IMS). This is the first reporting of a fast and sensitive method for dynamic sampling of large volumes of air using planar solid phase microextraction (PSPME) incorporating a high surface area for absorption of analytes onto a sol-gel polydimethylsiloxane (PDMS) coating for direct thermal desorption into an IMS. This device affords high extraction efficiencies due to strong retention properties at ambient temperature, resulting in the detection of analyte concentrations in the parts per trillion range when as low as 3.5 L of air are sampled over the course of 10 s (absolute mass detection of less than a nanogram). Dynamic PSPME was used to sample the headspace over the following: 3,4-methylenedioxymethamphetamine (MDMA) tablets resulting in the detection of 12-40 ng of piperonal, high explosives (Pentolite) resulting in the detection of 0.6 ng of 2,4,6-trinitrotoluene (TNT), and low explosives (several smokeless powders) resulting in the detection of 26-35 ng of 2,4-dinitrotoluene (2,4-DNT) and 11-74 ng of diphenylamine (DPA). PMID:20205382

Guerra-Diaz, Patricia; Gura, Sigalit; Almirall, José R

2010-04-01

73

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

74

iLife: A Novel Mobile Social Network Services on Mobile Phones  

Microsoft Academic Search

Currently, with the 3G technology, the mobile internet is gradually entering into people's life. With the rapid development of various mobile internet applications, the social life is being changed deeply. Searching information about service of life will be one of the most important applications in mobile internet. At the same time, the widespread use of mobile phones and the availability

Ting Sun; Xiaoyu Shi; Yanming Shen; Keqiu Li; Wenyu Qu

2010-01-01

75

Mobile Third Party Payment Competitive Strategy with Five Forces Model  

Microsoft Academic Search

The rapid development of mobile e-commerce will definitely bring about the prosperity of mobile payment market. As to this emerging market, it is wise for mobile operators to give a response quickly and timely and work out their own competitive strategies. The development path of mobile payment services should draw on the experience of third party payment and transform mobile

Wenxi Yao

2010-01-01

76

Analysis of the Actual Response Rates in Mobile Advertising  

Microsoft Academic Search

This study analyzed trends of recent mobile advertising in Korea by examining users' response rates of mobile advertisements, and the effectiveness of new advertising strategies designed to attract more customers. Mobile advertising is rapidly developing, and various formats of mobile advertisements are emerging into what is known as interactive media. Unlike passive advertising methods, mobile advertising can target specific audience

Hye Sun Lee; Chi Hyung Lee; Gun Hee Lee; Yi-Hyun Kim; Bong Gyou Lee

2006-01-01

77

VOLARE: Adaptive Web Service Discovery Middleware for Mobile Systems  

Microsoft Academic Search

With the recent advent and widespread use of smart mobile devices, the flexibility and versatility offered by Service Oriented Architecture's (SOA) makes it an ideal approach to use in the rapidly changing mobile environment. However, the mobile setting presents a set of new challenges that service discovery methods developed for non- mobile environments cannot address. The requirements a mobile client

Panagiotis Papakos; David S. Rosenblum; Arun Mukhija; Licia Capra

2009-01-01

78

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

79

Teleporting-making applications mobile  

Microsoft Academic Search

The rapid emergence of mobile computers as a popular, and increasingly powerful, computing tool is presenting new challenges. This subject is already being widely addressed within the computing literature. A complementary and relatively unexplored notion of mobility is one in which application interfaces, rather than the computer on which the applications run, are able to move. The Teleporting System developed

Frazer Bennett; Tristan Richardson; Andy Harter

1994-01-01

80

Mobile Search with Multimodal Queries  

Microsoft Academic Search

The popularity of mobile devices, such as PDAs and SmartPhones, has grown rapidly over the last couple of years. Though most users still perform searches using desktop computers, it is expected that more and more people will also search the Web while they are on the move. In addition to text-based keyword queries, mobile devices can support richer and hybrid

Xing Xie; Lie Lu; Menglei Jia; Hua Li; Frank Seide; Wei-Ying Ma

2008-01-01

81

Misbehavior in Mobile Application Markets  

Microsoft Academic Search

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

Steven Meyer

2011-01-01

82

Service Composition for Mobile Environments  

Microsoft Academic Search

Service Composition, that is, the development of customized services by discovering, integrating and executing existing services has received a lot of attention in the last couple of years with respect to wired-infrastructure or Internet web services. With the advancement in the wireless technology and rapid deployment of mobile devices, we envision that in the near future wirelessly connected mobile devices

Dipanjan Chakraborty; Anupam Joshi; Timothy W. Finin; Yelena Yesha

2005-01-01

83

Starch mobilization in leaves  

Microsoft Academic Search

Starch mobilization is well understood in cereal endosperms, but both the pathway and the regulation of the process are poorly characterized in other types of plant organs. Arabidopsis leaves offer the opportunity for rapid progress in this area, because of the genomic resources available in this species and the ease with which starch synthesis and degradation can be monitored and

Alison M. Smith; Samuel C. Zeeman; David Thorneycroft; Steven M. Smith

2010-01-01

84

Optimal control methods for rapidly time-varying Hamiltonians  

SciTech Connect

In this article, we develop a numerical method to find optimal control pulses that accounts for the separation of timescales between the variation of the input control fields and the applied Hamiltonian. In traditional numerical optimization methods, these timescales are treated as being the same. While this approximation has had much success, in applications where the input controls are filtered substantially or mixed with a fast carrier, the resulting optimized pulses have little relation to the applied physical fields. Our technique remains numerically efficient in that the dimension of our search space is only dependent on the variation of the input control fields, while our simulation of the quantum evolution is accurate on the timescale of the fast variation in the applied Hamiltonian.

Motzoi, F.; Merkel, S. T.; Wilhelm, F. K. [Institute for Quantum Computing and Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario, N2L 3G1 (Canada); Gambetta, J. M. [Institute for Quantum Computing and Department of Applied Mathematics, University of Waterloo, Waterloo, Ontario, N2L 3G1 (Canada)

2011-08-15

85

Mobile convergence: WINMEC mobile entertainment media forum  

Microsoft Academic Search

Proliferation of multimedia-enabled mobile and personal devices now allows downloading, playback and streaming of movie music\\/ring-tones, and, wallpaper\\/pictures. The entertainment media industry is experimenting rapidly with business models technologies to get revenue-generating content to the consumer. Issues of importance include content ownership, content rights management, the creation of new markets such as short movies, limited duration games, movie advertisements, push

Newton Lee

2006-01-01

86

Resource dependencies in mobile services value networks  

Microsoft Academic Search

As mobile infrastructures of 3G and beyond are evolving rapidly, the next generation of mobile Internet services is on its way. Developing and commercializing these mobile Internet services requires a broad set of resources and capabilities ranging from the basic telecommunication network to specific applications, user data and interesting content. As operators, content providers and application developers do not possess

Mark de Reuver; Harry Bouwman

2008-01-01

87

Mobile technology: streamlining practice and improving care.  

PubMed

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

Blake, Holly

2013-09-01

88

Exploring consumer attitudes towards mobile music services  

Microsoft Academic Search

The emerging capabilities of mobile telephony provide a promising alternative commerce channel, contributing to the configuration of the appropriate conditions for the forthcoming communication industry convergence. Elaborating on the rapid evolutions in the mobile commerce landscape, this paper investigates consumer attitudes towards mobile music services through an exploratory research approach conducted in Finland, UK and Greece. The objective of this

Pavlos Vlachos; Adam P Vrechopoulos; Georgios Doukidis

2003-01-01

89

Smart mobile media services: consumer intention model  

Microsoft Academic Search

The deployment of Smart Mobile Media Devices (SMMD) is growing rapidly. The primary reason that consumers are adopting Smart Mobile Media Devices is that they integrate many of the functions that previously required numerous technologies and devices. However, research on consumer's perceptions of this phenomenon is still at an early stage. The lack of a comprehensive definition of Smart Mobile

Aidan Duane

2010-01-01

90

Ultracompact optical zoom lens for mobile phone  

Microsoft Academic Search

Recently, high-end mobile camera phones are spreading rapidly all over the world. In addition, the demands for the optical zoom as new function of the mobile camera phones are very intense. However, it has been very difficult for the module manufacturers to propose an ultra compact zoom lens unit which can be mass-producible and fit into the size of mobile

Keiji Matsusaka; Sou Ozawa; Ryuichi Yoshida; Tomoyuki Yuasa; Yoshihito Souma

2007-01-01

91

Mobile Internet Services from Consumers' Perspectives  

Microsoft Academic Search

Elaborating on the rapid evolution of mobile internet services in Korea, this article investigates consumers' perceptions and attitudes toward mobile Internet services through person-to-person questionnaires. The study tried to find out “how” consumers perceived different mobile services from the consumers perspectives: expectation, satisfaction, and fulfillment of that expectation. A new construct of perceived fulfillment of expectation was suggested in the

Seongil Lee

2009-01-01

92

Mobile marketing  

Microsoft Academic Search

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

Fiona Jenkins

2006-01-01

93

Mining Linguistic Mobility Patterns for Wireless Networks  

Microsoft Academic Search

\\u000a Wireless networks and mobile applications have grown very rapidly and have made a significant impact on computer systems.\\u000a Especially, the usage of mobile phones and PDA is increased very rapidly. Added functions and values with these devices are\\u000a thus greatly developed. If some regularity can be known from the user mobility behavior, then these functions and values can\\u000a be further

Tzung-pei Hong; Cheng-ming Huang; Shi-jinn Horng

2005-01-01

94

Biomolecule Analysis by Ion Mobility Spectrometry  

PubMed Central

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

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

2013-01-01

95

Rule based dynamic adaptation of mobile services based on context  

Microsoft Academic Search

Mobile handsets are rapidly evolving (OS, mp3, picture, videos, GPS receiver, sensors) thus enabling complex applications hosting and comprehensive context data collection. Fostered by W3C, MWI and OMA efforts, Mobile Web is increasingly looking at complementing Internet with specific mobile functionalities. These trends are indeed opening new business opportunities but the number of services and applications will rapidly overcrowd terminals.

Claudio Venezia; Carlo Alberto Licciardi; Alessia Salmeri

96

Mobile Networking  

Microsoft Academic Search

\\u000a We point out the different performance problems that need to be addressed when considering mobility in IP networks. We also\\u000a define the reference architecture and present a framework to classify the different solutions for mobility management in IP\\u000a networks. The performance of the major candidate micro-mobility solutions is evaluated for both real-time (UDP) and data (TCP)\\u000a traffic through simulation and

Chris Blondia; Nik Van Den Wijngaert; Gert Willems; Olga Casals; Llorenç Cerdà; Marcelo Bagnulo; Ignacio Soto

2003-01-01

97

MANKALA: a traditional game developed for mobile use  

Microsoft Academic Search

The market for mobile games is expanding rapidly, and several games market in the advanced world are booming with sales, that has led us to the use of latest tools for mobile application development to modify and enhance an existing and traditional game to make it available for mobile users, Congkak game is developed for the latest mobile phones in

Aloysius Akpanobong; Oras F. Baker

2009-01-01

98

Measuring Ajax Performance on a GPRS Mobile Platform  

Microsoft Academic Search

Today, mobile technology is rapidly affecting our society, with increasing numbers of services supported by mobile phones, including mobile Internet access. However, mobile Internet access performance over GPRS networks is often unacceptably slow. A new web development model, Ajax, may help to address this problem. Ajax (Asynchronous JavaScript and XML), is a new desktop approach to web application development that

F. Xie; D. Parsons

99

Consumer Attitudes Toward Mobile Advertising: An Empirical Study  

Microsoft Academic Search

The rapid proliferation of mobile phones and other mobile devices has cre- ated a new channel for marketing. The use of Short Messaging Service to access custom- ers through their handheld devices is gaining popularit y, making the mobile phone the ultimate medium for one-to-one marketing. The present research investigates consumer attitudes toward mobile advertising and the relationship between attitude

Melody M. Tsang; Shu-Chun Ho; Ting-Peng Liang

2004-01-01

100

Signal environment response of a generic mobile communication system  

Microsoft Academic Search

Mobile communication has been, and continues to be, an essential tactical requirement for many types of commercial and military operations involving cellular mobile communication systems, radio communication stations and mobile forces. Specific mobile unit requirements vary widely because of different needs and different traditional methods of satisfying such needs within the several branches of the customer. The system in object,

Servilio Sebastiani

1999-01-01

101

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

Microsoft Academic Search

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

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

2008-01-01

102

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

103

Mobile advertising: The influence of emotional attachment to mobile devices on consumer receptiveness  

Microsoft Academic Search

Mobile advertising has grown rapidly over recent years, yet volume is not necessarily a good measure of consumer acceptance. Earlier studies have explored acceptance in terms of content; here we focus on the communication medium, the mobile device. Building upon Vincent's (2006) premise that emotional attachment to mobile phones is a likely key influence on future adoption of new services,

Ailsa Kolsaker; Nikolaos Drakatos

2009-01-01

104

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

105

Dynamic Mobility via Cellular Decompositions of Coordination Spaces.  

National Technical Information Service (NTIS)

To accomplish feats of rapid, nimble locomotion, the ground mobile robots of tomorrow must exhibit great dexterity and dynamic mobility. As their complexity increases, however, the need for principled approaches to coordinating a robot's actuators becomes...

G. C. Haynes T. Stentz

2012-01-01

106

Are mobile phones harmful?  

PubMed

There is increasing public interest in health risks of mobile phone use. Although there is a vast body of material on the biological effects of radiofrequency fields, current risk assessment is still limited. The article describes several hypotheses and results of biological effects such as thermal effect, genetic and carcinogenic effects and cancer related investigations. Mobile phones transmit and receive waves of frequencies mainly at 800-1800 MHz. Findings on the thermal effect of acute exposure to radiofrequency fields were consistent, resulting in an increase of cellular, tissue or body temperature by 1 degree C or more. Guidelines for risk limits are based on this thermal effect. Experimental investigation suggests that radiofrequency fields are not tumor initiators and that if they are related to carcinogenicity, this would be by tumor promotion or by increasing the uptake of carcinogens in cells. Implications of these experimental results on public health concerns are yet unclear. Few epidemiological studies are available on the use of mobile phones or on the radiofrequency exposure and the development of cancer. Most of these studies have no or little quantitative exposure data and they are limited by the small number of observations. Large epidemiological studies are necessary in order to investigate the use of mobile phones on the development of cancer. It should be emphasized that even a small elevated risk may have a large implication for public health, as the use of mobile phones and the exposure is rapidly increasing. PMID:11206998

Blettner, M; Berg, G

2000-01-01

107

Common community structure in time-varying networks  

NASA Astrophysics Data System (ADS)

In this report we introduce the concept of common community structure in time-varying networks. We propose a novel optimization algorithm to rapidly detect common community structure in such networks. Both theoretical and numerical results show that the proposed method not only can resolve detailed common communities, but also can effectively identify the dynamical phenomena in time-varying networks.

Zhang, Shihua; Zhao, Junfei; Zhang, Xiang-Sun

2012-05-01

108

Routing in Extremely Mobile Networks  

Microsoft Academic Search

To become realistically untethered, wireless communication networks need to be self-organised, rapidly deployable, infrastructureless\\u000a and mobile. Existing protocols are efficient in routing data dynamically between mobile nodes that belong to the same connected\\u000a component. Concrete applications such as Defence and Disaster-Relief cannot always assume that the network is connected (i.e., not partitionned). However, even if the network is continuously partitioned,

Géraud Allard; Philippe Jacquet; Bernard Mans

109

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

110

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.

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

2013-01-01

111

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

PubMed

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 m(2)) 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

2013-10-08

112

Modeling Mobility  

NASA Astrophysics Data System (ADS)

In wireless networks, communication can take place based on an infrastructure (e.g. WLAN access point or GPRS base station) or it can take place in adhoc mode, where mobile devices are connected directly to each other and care for the routing by themselves (mobile ad-hoc networks). When such wireless networks are investigated and simulations are performed, it is often necessary to consider the movement of entities within the simulated environment.

Berl, Andras

113

Situational Effects on the Usage Intention of Mobile Games  

Microsoft Academic Search

As value-added services on mobile devices are developing rapidly, text messaging, multi-media messaging, music, video, games,\\u000a GPS navigation, RFID, and mobile TV are all accessible from a single device. Mobile games that combine mobile communication\\u000a with computer games are an emerging industry. The purpose of this research is to explore what situation factors may affect\\u000a the intention to play mobile

Ting-Peng Liang; Yi-Hsuan Yeh

2009-01-01

114

A Framework for Decentralized, Context-Aware Mobile Applications Using Semantic Web Technology  

Microsoft Academic Search

The recent evolution in mobile devices, combined with rapid advancements in identification techniques, has lead to new opportunities for mobile application developers: mobile applications that can be made aware of their environment and the objects in it. Additionally, by combining mobile devices and identification technology with the Web, mobile applications can be developed that exploit services and information associated with

William Van Woensel; Sven Casteleyn; Olga De Troyer

2009-01-01

115

Inter GW Load Balancing for Next Generation Mobile Networks with Flat Architecture  

Microsoft Academic Search

With rapid growth of mobile users and developents of mobile equipments like cell phones, laptops and personal digits assistances (PDA), mobile networks have to meet dramatically increased service demands in the nearest future. The ever-increasing demands, such as the users expect to enjoy the service anywhere, anytime and the networks support a seamless mobility, driving the evolution of mobile networks

Cheng Xue; Jijun Luo; Ruediger Halfmann; Egon Schulz; Christian Hartmann

2009-01-01

116

The Investigation of Cloud-Computing-based Image Mining Mechanism in Mobile Communication WEB on Android  

Microsoft Academic Search

With the development of 3G network technology, the rapid upgrading of mobile phone hardware, and the refined requirements for mobile phones by mobile phone users, it is essential for mobile phones to be able to promptly and accurately process images. A mobile phone terminal sends the service requests to cloud computer system which then processes the requests and sends the

Cai-Dong Gu; Kan Lu; Jian-Ping Wu; Ying-li Fu; Jing-xiang Li; Chang-shui Xiao; Mao-xin Si; Zhao-bin Liu

2010-01-01

117

A novel MPEG4 short film production system based on mobile context photo  

Microsoft Academic Search

The explosive growth of the Internet and the rising popularity of mobile devices have created a varying environment where lots of mobile multimedia applications and services are emerging everyday. This paper proposes a novel MPEG-4 short film production system based on mobile context photo. This system records context information surrounding mobile user when taking photos, and uses the mobile context

Hu Jinlong; Zhang Ling; Liao Bin; Wu Yisheng; An Ningyu

2010-01-01

118

A STUDY ON THE COLOR AND STYLE COLLOCATION OF MOBILE PHONES USING NEURAL NETWORK METHOD  

Microsoft Academic Search

There are a variety of mobile phones in the market. In order to attract consumers, the manufacturers of mobile phones vary the designs in style and in color. However, what style of mobile phone is just suitable for the color? If the color change of mobile phone could influence the style of mobile phone. In order to explore the relationships

Shing-Sheng Guan; Yang-Cheng Lin

2001-01-01

119

The rapid deployment digital satellite network  

Microsoft Academic Search

The ground mobile forces (GMF) satellite digital multichannel radio, which provided the US Marine Corps with the primary transmission links for its switched backbone during Operations Desert Shield and Desert Storm, is discussed. Reliable and highly mobile, the multichannel terminals provided clear and consistent digital pipelines for the Marine Corps circuit switched network and were rapidly deployed on military HWMMV

D. P. O'Neil

1992-01-01

120

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

121

Delivering a Fully Interactive Mobile TV  

Microsoft Academic Search

Affordable mobile devices with video playback functionality are rapidly growing in the market. Current wireless and third generation communication networks enable smoother and higher quality streaming video. With the support of these technologies, most participants in telecom value-added service chain are planning to shift their business focus to a more profitable and appealing area, mobile TV. Previous work that survey

Dian Tjondronegoro; Lei Wang; Adrien Joly

2006-01-01

122

EFFECTS OF MOBILE TELEPHONES ON HEARING  

Microsoft Academic Search

The exposure to electromagnetic field emitted by mobile telephones is increasing rapidly worldwide that causes side effects, including thermal and non thermal side effects. Ear proximity to electromagnetic source may lead to greater damage and side effects, including hearing loss. This study was performed to assess the chronic effect of exposure to electromagnetic field of mobile telephones on hearing by

M. Shayani-Nasab; S. A. Safavi Naiianni; M. R. Fathol Alolomi; A. Makaremi

123

DISTRIBUTED SYSTEMS SUPPORT FOR MOBILE APPLICATIONS  

Microsoft Academic Search

oductipn, Future computer environments will include mobile computers which will either be disconnected, weakly inter-connected by low speed wireless networks such as GSM, or fully inter- connected by high speed networks ranging from Ethemet to ATM. Two key characteristics of such environments are:- (i) (ii) a heterogeneous processing environment (including relatively low-power mobile hosts) and, rapid and massive fluctuations in

A. Friday; N. Davies

124

Design and Implementation of Mobile English Learning  

Microsoft Academic Search

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

Shuyun Han; Weiliang Kong; Qingtang Liu; Lian Zhou

2010-01-01

125

Adaptive security protocol selection for mobile computing  

Microsoft Academic Search

The mobile computing paradigm has introduced new problems for application developers. Challenges include heterogeneity of hardware, software, and communication protocols, variability of resource limitations and varying wireless channel quality. In this scenario, security becomes a major concern for mobile users and applications. Security requirements for each application are different, as well as the hardware capabilities of each device. To make

B Pontes Soares Rocha; Daniel N. O. Costa; Rande A. Moreira; Cristiano G. Rezende; Antonio Alfredo Ferreira Loureiro; Azzedine Boukerche

2010-01-01

126

Transnational Academic Mobility and Gender  

ERIC Educational Resources Information Center

This paper examines to what extent the participation of researchers in transnational academic mobility, their experiences and perceived outcomes vary by gender. Based on longitudinal statistics, original survey data and semi-structured interviews with former visiting researchers in Germany, the paper shows that the academic world of female…

Jons, Heike

2011-01-01

127

Mobile communications - an overview  

Microsoft Academic Search

This article focuses on voice communications using mobile (cell) phones over mobile\\/cellular networks. The advances in processors, memory, signal processing, communication technologies, and several related techniques, personal mobile communications has witnessed tremendous growth. A typical mobile communication network consists of: mobile devices, BS, mobile switching centers, gateway mobile switching center. Cell phones communicate wirelessly with BSs. Base stations communicate with

S. R. Subramanya; B. K. Yi

2005-01-01

128

HIV CARE FOR GEOGRAPHICALLY MOBILE POPULATIONS  

PubMed Central

The interaction between mobility and HIV risk is well recognized, but what happens to those same individuals, once infected, as they transition to living with HIV? Does mobility affect their transition into HIV care? If so, do mobile and non-mobile populations achieve similar success with HIV treatment? The definition of mobility has changed over the centuries to encompass a complex phenotype including permanent migration, frequent travel, circular migration, and distance from HIV treatment centers. The heterogeneity of these definitions leads to discordant findings. Investigations show that mobility has an impact on HIV risk, but fewer data exist on the impact of geographic mobility on HIV care and treatment. This review will examine existing data on the impact of geographic mobility on access to and maintenance in HIV care and on adherence to antiretroviral therapy. It will also expand the concept of mobility to include data on the impact of the distance from residence to clinic on HIV care and treatment adherence. Our conclusions are that the existing literature is limited by varying definitions of mobility and the inherent oversimplification necessary to apply a “mobility measure” in a statistical analysis. The impact of mobility on HIV treatment outcomes deserves further exploration to both define the phenomenon and target interventions to these at-risk populations.

Taylor, Barbara S.; Garduno, L. Sergio; Reyes, Emily V.; Valino, Raziel; Rojas, Rita; Donastorg, Yeycy; Brudney, Karen; Hirsch, Jennifer

2011-01-01

129

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

130

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.

History, American M.

2012-06-26

131

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.

132

Identity and Global Mobility  

Microsoft Academic Search

\\u000a This chapter examines how identity is related to the mobility of professionals who initiate expatriation. In this context\\u000a a “professional” has a multifaceted identity in which career (a personal identity), family (a role identity) and cultural\\u000a selves (a collective identity) are combined. These components vary in the degree to which they affect the motivation to expatriate\\u000a or repatriate.\\u000a \\u000a \\u000a Having a

Phyllis Tharenou

133

Examining registration delays in mobile based social networks  

Microsoft Academic Search

The popularity of web based social networks is rapidly increasing nowadays. These solutions allow managing relationships online. There are also several mobile solutions to these networks but they are mainly limited to reaching the services of the social network from the mobile device. The fact, that the phonebook of the mobile phones also represents social relationships, can be used for

Péter Ekler; Tamás Lukovszki; Hassan Charaf

2010-01-01

134

Palmprint Verification on Mobile Phones Using Accelerated Competitive Code  

Microsoft Academic Search

With the rapid development of the mobile communication market the need for mobile biometrics emerges. This is a novel research topic within biometrics and not much work has been done in the past. This paper presents the initial work of a long-term project towards a robust mobile palmprint verification system. We develop a hand orientation normalization method which makes the

Marc Franzgrote; Christian Borg; Benjamin J. Tobias Ries; Stefan Bussemaker; Xiaoyi Jiang; Michael Fieleser; Lei Zhang

2011-01-01

135

The gap filler technology for mobile satellite system  

Microsoft Academic Search

Satellite mobile communication systems have rapidly come into widespread use and user have begun to require high speed multimedia services in mobile environments in any place; even if high speed train. In response to these demands, mobile satellite communication system is the key solution to provide high speed multimedia services in high speed train. Nowadays the high speed portable system

Joon Gyu Ryu; Min-Su Shin; S. M. Han; D. I. Jang; Ho-Jin Lee

2007-01-01

136

Deployment of Mobile Broadband Service in the United States  

Microsoft Academic Search

Broadband deployment in the United States is expanding rapidly but unevenly. Using new FCC census data on wireline and wireless broadband providers, we study mobile broadband provision within the United States. Although rural areas lag non-rural areas in the availability of residential access to both mobile and fixed broadband, mobile broadband is at least partially filling in geographical gaps in

James Prieger

2011-01-01

137

FORENSIC INVESTIGATION PROCESS MODEL FOR WINDOWS MOBILE DEVICES  

Microsoft Academic Search

Windows mobile device forensics is relatively a new field of interest among scientific and law enforcement communities. This paper describes the various processes involved in the forensic investigation of Windows mobile devices in the form of a twelve-stage model. The rapid technological advancements and increasing popularity of Windows mobile devices pose great challenges for investigators and law enforcement officials all

Anup Ramabhadran

138

Wide area mobile communication networks with multiple routing mode options  

Microsoft Academic Search

A wide area mobile communication network with multiple modes of transmission routing is described. This is achieved through the integration of multiple, independent wide area networks at both the fixed base station and the mobile device. Through this network, mobile communication devices have access to multiple rf transmission paths with varying characteristics of signal strength, coverage, data rates and cost.

David W. Best; Santanu Dutta; Dennis Sutherland

1995-01-01

139

Mobile Customer Relationship Management and Mobile Security  

NASA Astrophysics Data System (ADS)

The purpose of this study is twofold. First, in order to guarantee a coherent discussion about mobile customer relationship management (mCRM), this paper presents a conceptualization of mCRM delineating its unique characteristics because of Among the variety of mobile services, considerable attention has been devoted to mobile marketing and in particular to mobile customer relationship management services. Second, the authors discusses the security risks in mobile computing in different level(user, mobile device, wireless network,...) and finally we focus on enterprise mobile security and it's subgroups with a series of suggestion and solution for improve mobile computing security.

Sanayei, Ali; Mirzaei, Abas

140

Adaptive base station antennas for mobile communication systems  

Microsoft Academic Search

There has been a rapid increase in the number of mobile communication users, resulting in an equally rapid need for increased capacity in the networks. Extensive research and development work on advanced base station antennas for mobile communication is in progress at Ericsson. This includes both active and adaptive antenna systems. With the introduction of active antenna products, it is

Bjorn Johannisson

1998-01-01

141

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

142

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

Microsoft Academic Search

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

Xiangpei Hu; Wenli Li; Qing Hu

2008-01-01

143

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

144

Why do trade costs vary?  

Microsoft Academic Search

As tariffs have fallen, it is apparent that trade costs are a significant obstacle to international trade and that they vary\\u000a from country to country. The gap between the cif and fob value of a trade flow is a useful measure of aggregate trade costs,\\u000a but only if the measure is based on a consistent volume of trade; mirror statistics

Richard Pomfret; Patricia Sourdin

2010-01-01

145

The Mobile ID Based Biometric Undeniable Signature Scheme  

Microsoft Academic Search

\\u000a The wide use of mobile devices such as smart phones makes the mobile commerce industry be growing-up rapidly. In mobile commerce\\u000a security, how to secure a copyright of mobile contents and how to distribute it are of major concern. The user can carry the\\u000a smart phone regardless of the places. The utilization of a smart phone is very high than

SungHyun Yun

146

Handover performance in the mobile WiMAX networks  

Microsoft Academic Search

Mobile terminals allow users to access service while on the move. This unique feature has driven the rapid growth in the mobile network industry, changing it from a new technology into a massive industry in less than two decades. In this thesis, an in-depth study of the handover effects of mobile WiMAX networks is carried out. The mobile WiMAX technology

Yongxue Yu

2009-01-01

147

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.

148

Rising Level of Public Exposure to Mobile Phones: Accumulation through Additivity and Reflectivity  

Microsoft Academic Search

A dramatic development occurring in our daily life is the increasing use of mobile equipment including mobile phones and wireless access to the Internet. They enable us to access several types of information more easily than in the past. Simultaneously, the density of mobile users is rapidly increasing. When hundreds of mobile phones emit radiation, their total power is found

Tsuyoshi Hondou

2002-01-01

149

Toward a Framework for the Discovery and Acquisition of Mobile Applications  

Microsoft Academic Search

Mobile application development is a field that has gone through rapid change during the past two decades. Although, in the past, the development and control of mobile devices was performed by phone manufacturers and network carriers, and development was done ‘in house’, the evolution of mobile device capabilities has expanded the potential for mobile application developers. This evolution has created

Qusay H. Mahmoud; Pawel Popowicz

2010-01-01

150

New Strategies for Stem Cell Mobilization  

PubMed Central

Mobilized peripheral blood (PB) is widely used as source of stem cells (PBSCs) for autologous stem cell transplantation (ASCT). The use of cytokines, alone or in combination with chemotherapy (chemomobilization), is the most common strategy applied to mobilize and collect PBSCs. However, a significant proportion of cancer patients fail to mobilize enough PBSCs to proceed to ASCT. Plerixafor is a small molecule that reversibly and transiently disrupts the interaction between the chemokine receptor CXCR4 and its ligand CXCL12 (formerly known as stroma derived factor 1, SDF-1) leading to the rapid release of CD34+ hematopoietic stem cells from the bone marrow (BM) to PB. Plerixafor has been recently approved to enhance PBSC mobilization in adult patients with multiple myeloma or non-Hodgkin lymphoma and has been shown to be more effective than G-CSF alone. There is limited experience on combining plerixafor with chemotherapy plus G-CSF in patients who mobilize poorly. Current evidence suggests that the addition of plerixafor is safe and effective in the large majority of the patients with low blood CD34+ cell count after mobilization and/or poor yield after the first collection(s). Circulating CD34+ cells can be increased by several folds with plerixafor and the majority of the patients considered “poor mobilizers” can be successfully collected. Overall, its mechanism of action inducing the rapid release of CD34+ cells from the BM to the circulation makes plerixafor suitable for the ‘preemptive’ use in patients who are hard-to-mobilize.

Lemoli, Roberto M.

2012-01-01

151

Rapid ejaculation  

Microsoft Academic Search

Rapid ejaculation, or premature ejaculatory dysfunction, is the most frequently encountered sexual complaint of men and couples.\\u000a It is most common in adolescents, young adults, and other sexually naive males. Increased risk is associated with lack of\\u000a sexual experience, lack of knowledge regarding normal male and female sexual responses, and with those individuals who highly\\u000a associate psychological factors (such as

Allen D. Seftel; Stanley E. Althof

2000-01-01

152

Mass varying neutrinos in supernovae  

NASA Astrophysics Data System (ADS)

We study the consequences on the neutrino oscillation parameter space, mixing angle (tan?2?), and vacuum mass difference (?m02) when mass varying neutrino (MaVaN) models are assumed in a supernova environment. We consider electronic to sterile channels ?e??s and ?¯e??¯s in two-flavor scenario. In a given model of MaVaN mechanism, we induce a position-dependent effective mass difference, ?m˜2(r), where r is the distance from the supernova core, that changes the neutrino and antineutrino flavor conversion probabilities. We study the constraints on the mixing angle and vacuum mass difference coming from r-process and the SN1987A data. Our result is the appearance of a new exclusion region for very small mixing angles, tan?2?=10-6-10-2, and small vacuum mass difference, ?m02=1-20eV2, due the MaVaN mechanism.

Rossi-Torres, F.; Guzzo, M. M.; de Holanda, P. C.; Peres, O. L. G.

2011-09-01

153

Implementation of a real-time color matching between mobile camera and mobile LCD based on 16-bit LUT design  

NASA Astrophysics Data System (ADS)

Until now, many of mobile display manufacturers try to improve the contrast ratio, viewing angle, and backlightluminance for its color fidelity and image quality. However, with the multimedia convergence, various imaging devices have been made smaller and loaded in a mobile phone as independent modules, which brings about the necessity of the color consistency between each module. Especially, with the population and rapid growth of mobile camera, it is important for mobile LCD to reproduce realistically and accurately the object color of a moving-picture transmitted by a mobile camera. Therefore, we developed a real-time color matching system between mobile camera and mobile LCD based on a 16-bit lookup table (LUT) design. As a result, a moving-picture is realistically and accurately reproduced on mobile LCD by applying the proposed lookup table to mobile display.

Son, Chang-Hwan; Park, Tae-Yong; Lee, Cheol-Hee; Ha, Yeong-Ho

2006-10-01

154

Mobile video stories  

Microsoft Academic Search

The aim of this article is to test how different narrative structures work in mobile video storytelling applications for creative arts. Especially, we are interested in stories made with the mobile phone and for the mobile phone i.e. they are supposed to be viewed on the mobile phone. In addition, we present a new mobile social video service and demo

Jari Multisilta; Marjo Mäenpää

2008-01-01

155

Do G-CSF mobilized, peripheral blood-derived stem cells from healthy, HLA-identical donors really engraft more rapidly than do G-CSF primed, bone marrow-derived stem cells? No!  

Microsoft Academic Search

For more than a decade, the notion that peripheral blood-derived stem cells engraft more rapidly than bone marrow-derived stem cells after high-dose therapy has dominated our thinking. Recently, reports that granulocyte colony-stimulating factor (G-CSF) induces a proteolytic marrow microenvironment have provided mechanistic support for that belief, compelling us to review our own experience of 29 consecutive transplants with HLA-identical blood

Gerald J Elfenbein; Robert Sackstein; David J Oblon

2004-01-01

156

33 CFR 165.835 - Security Zone; Port of Mobile, Mobile Ship Channel, Mobile, AL.  

Code of Federal Regulations, 2010 CFR

...Security Zone; Port of Mobile, Mobile Ship Channel, Mobile, AL. 165.835 Section 165.835 Navigation and Navigable Waters...Security Zone; Port of Mobile, Mobile Ship Channel, Mobile, AL. (a) Definition. As used in this sectionâ Cruise...

2010-07-01

157

33 CFR 165.835 - Security Zone; Port of Mobile, Mobile Ship Channel, Mobile, AL.  

Code of Federal Regulations, 2010 CFR

...Security Zone; Port of Mobile, Mobile Ship Channel, Mobile, AL. 165.835 Section 165.835 Navigation and Navigable Waters...Security Zone; Port of Mobile, Mobile Ship Channel, Mobile, AL. (a) Definition. As used in this sectionâ Cruise...

2009-07-01

158

MCA (Military Construction, Army) Mobilization Program Subsystem (MOBPRO): Functional Description and Subsystem Design.  

National Technical Information Service (NTIS)

Through mobilization construction programming, the U.S. Army Corps of Engineers (USACE) is responsible for providing the facilities needed for the mobilization of the Army. To fulfill the requirement of a rapid response to a specific or changing mobilizat...

I. Adiguzel J. Clark J. McGurk J. S. Cath

1989-01-01

159

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.

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

2005-01-01

160

Geographic Mobility and Aging in Place  

Microsoft Academic Search

Because the popular press has had a long-term interest in the phenomenon of retirement migration, the small proportion of\\u000a older persons who make long-distance moves has gotten a great deal of public attention. This state of affairs is unfortunate\\u000a because mobility is richer and much more varied than the popular notion of it suggests and the explanations of mobility that

Don E. Bradley; Charles F. Longino

161

Ghana social mobilization analysis.  

PubMed

In order to increase communication channels for child survival and development, the government and UNICEF Ghana undertook a "social mobilization analysis." This analysis included three studies that aimed to identify individuals and existing organizations with the potential to serve as health communicators and to determine the type of assistance that they needed to maximize their effectiveness in this role. The first study surveyed governmental institutions, trade unions, revolutionary organizations, traditional leaders, and others and found a largely untapped reservoir of capacities to promote child health, with varying levels of current involvement. The primary need identified was for information and training materials. The second study focused on the mass media and revealed a low coverage of maternal and child health topics and the need for better cooperation between journalists and health professionals. The third study assessed sources of health information for parents and found several sources, such as religious organizations, women's groups, and school teachers that could be mobilized to promote child health. Recommendations are made for the use of the findings. PMID:2037495

Tweneboa-Kodua, A; Obeng-Quaidoo, I; Abu, K

1991-01-01

162

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

163

Breathing patterns during varied activities.  

PubMed

The level of ventilation attained and breathing patterns adopted during activity have important implications for the distribution and deposition of particles that are inhaled. However, breathing patterns and levels of ventilation adopted during specific physical activities are unknown. We used a noninvasive means of measuring ventilation in subjects performing a variety of activities (bicycling, arm ergometry, lifting, and pulling) during unencumbered (no mouthpiece) breathing and while breathing through a mouthpiece. Minute ventilation (VE), tidal volume (VT), inspiratory time (TI), and total breathing cycle time (TT) were measured initially both spirometrically and from body surface displacements. When a mouthpiece was used, VE and breathing patterns were significantly altered during all activities such that VE, VT, and TT increased by 16, 34, and 20%, respectively. This mouthpiece effect was attenuated at the higher levels of VE. A task dependency of breathing pattern was also noted such that there was much greater variability of VT and TI for a given VE during the lifting activity compared with bicycling (coefficient of variation for VT of 0.39 +/- 0.09 vs. 0.20 +/- 0.07, P less than 0.01; and for TI of 0.38 +/- 0.08 vs. 0.21 +/- 0.08, P less than 0.01). We conclude that a mouthpiece significantly alters breathing pattern during varied types and intensities of activities, and breathing patterns may differ significantly from one activity to another. When the total dose of particulates inhaled in the lung are assessed, the mouthpiece effect and activity effect on breathing pattern must be considered. PMID:1400052

Paek, D; McCool, F D

1992-09-01

164

Note: Integration of trapped ion mobility spectrometry with mass spectrometry  

PubMed Central

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

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

2011-01-01

165

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

PubMed

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

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

2011-12-01

166

An agent-based English auction protocol using Elliptic Curve Cryptosystem for mobile commerce  

Microsoft Academic Search

Rapid development of the Internet and the extensive use of mobile phones have increased demand for mobile devices in Internet auctions. This trend is acting as an incentive to develop an auction model for mobile-based environment. Recently, Kuo-Hsuan Huang proposed a mobile auction agent model (MoAAM), which allows the bidders to participate in online auctions through a mobile agent. He

Yu-Fang Chung; Yu-Ting Chen; Tzer-Long Chen; Tzer-Shyong Chen

2011-01-01

167

Mobile Environmental Information Systems  

Microsoft Academic Search

This paper presents foundations for building mobile environmental information systems (MEIS) that require a multidisciplinary approach. MEIS require expertise from environmental biology, geography and mobile technology. MEIS are very promising in bringing added value in the acquisition of environmental information with a multitude of mobile devices. Automatic mobile acquisition makes it easy to forward the information to central databases for

Harri Antikainen; Alfred Colpaert; Niina Jaako; JARMOV RUSANEN; Dan Bendas; Mauri Myllyaho; Markku Oivo; Pasi Kuvaja; Jouni Similä; Kyösti Marjoniemi; Kari Laine; Esko Saari

2004-01-01

168

Secure Mobile Networking.  

National Technical Information Service (NTIS)

This project produced a Secure Mobile Network (SMN) system for secure enclaves or virtual networks among mobile workstations, an integrated Mobile-IP/ IPSEC system in which Mobile Nodes use 2-way tunnels to securely tunnel packets to the Home Agent. A key...

J. R. Binkley J. McHugh

2001-01-01

169

Interacting with Mobile Intelligence  

Microsoft Academic Search

The mobile device market offers considerable potential for software products, however, currently there are few compelling applications for hand-helds. We identify the potential for mobile intelligent systems and briefly describe the software that we have developed to enable mobile intelligent system construction. We outline the requirements for a mobile intelligent system for the corporate sector and discuss our attempts to

Lynne Hall; Adrian Gordon; Russell James; Lynne Newall

170

Uranus Mobile Robot.  

National Technical Information Service (NTIS)

The Uranus mobile robot was built by Carnegie Mellon University's Mobile Robot Lab to provide a general purpose mobile base to support research into indoor robot navigation. As a base, it provides full mobility, along with support for a variety of payload...

M. Blackwell

1990-01-01

171

Mobile Learning: the Virtual \\  

Microsoft Academic Search

Even in distance learning institutions, the students choose in 80% of the cases paper as data medium. Researches have shown that they are primarily motivated by the mobility of the medium itself and the mobility granted to its user. It seemed interesting to examine to what extent currently available mobile devices can offer the students greater mobility and to evaluate

Anne-Dominique SALAMIN; Anne LE CALVÉ

172

Formation and stabilization of ibuprofen nanoparticles by pulsed rapid expansion of supercritical solutions  

NASA Astrophysics Data System (ADS)

Pulsed rapid expansion of supercritical solutions (RESS) was used to micronize racemic ibuprofen and S-ibuprofen. The characterization of the particles was carried out with rapid-scan infrared spectroscopy in situ, 3-wavelengths-extinction measurements, a scanning mobility particle sizer, scanning electron microscopy, and X-ray diffraction. We observed the formation of nanosized primary particles that coagulate and agglomerate strongly to form large chains of many microns in size. It is investigated where the coagulation/agglomeration processes take place and we demonstrate that it is possible to avoid these processes by forming mixed ibuprofen/polymer particles. The stabilization of separate particles depends strongly on the amount of polymer in the particles. Our specially designed RESS apparatus with two different extractor units allows us to vary the fraction of polymer systematically.

Hermsdorf, Dana; Jauer, Stephan; Signorell, Ruth

173

In-vitro mobility of the lumbar spine.  

PubMed Central

As part of a systematic study of the spine between D11 and S1 the response to stress has been assessed by measuring radiologically the total and segmental mobility of 103 specimens. The method was shown to be reproducible to within 10% of total mobility. No significant sex difference was seen. Total mobility varied widely, but mean total mobility fell with age. All lumbar segments became less mobile up to the fifth decade. Between the fifth and the eighth decade the mobility of the fifth lumbar segment continued to fall, whereas other lumbar segments became more mobile. The mobility of each segment also varied widely, but the mean segmental mobility fell progressively from L5 to D11. However, this smooth pattern of movement was seen in only 16 cases, mostly adolescents and young adults. Among the remainder, in which movement was irregularly distributed, there were 7 cases (4 aged less than 30 years) in which the mobility of at least 1 segment was more than 2 standard deviations above the mean. The cause of this hypermobility was not evident radiologically. It is suggested that segments with abnormally high mobility may be at risk.

Hilton, R C; Ball, J; Benn, R T

1979-01-01

174

Correlations Between Bacterial Ecology and Mobile DNA  

PubMed Central

Several factors can affect the density of mobile DNA in bacterial genomes including rates of exposure to novel gene pools, recombination, and reductive evolution. These traits are difficult to measure across a broad range of bacterial species, but the ecological niches occupied by an organism provide some indication of the relative magnitude of these forces. Here, by analyzing 384 bacterial genomes assigned to three ecological categories (obligate intracellular, facultative intracellular, and extracellular), we address two, related questions: How does the density of mobile DNA vary across the Bacteria? And is there a statistically supported relationship between ecological niche and mobile element gene density? We report three findings. First, the fraction of mobile element genes in bacterial genomes ranges from 0 to 21% and decreases significantly: facultative intracellular > extracellular > obligate intracellular bacteria. Results further show that the obligate intracellular bacteria that host switch have a higher mobile DNA gene density than the obligate intracellular bacteria that are vertically transmitted. Second, while bacteria from the three ecological niches differ in their average mobile DNA contents, the ranges of mobile DNA found in each category overlap a surprising extent, suggesting bacteria with different lifestyles can tolerate similar amounts of mobile DNA. Third, mobile DNA gene densities increase with genome size across the entire dataset, and the significance of this correlation is dependent on the obligate intracellular bacteria. Further, mobile DNA gene densities do not correlate with evolutionary relationships in a 16S rDNA phylogeny. These findings statistically support a compelling link between mobile element evolution and bacterial ecology.

Newton, Irene L. G.

2010-01-01

175

Mobile Phones Coupled with Remote Sensors for Surveillance.  

National Technical Information Service (NTIS)

Highly mobile, maneuver units require the ability to rapidly provide perimeter defense for their assets. Remote sensors, combined with wireless networks and Smartphones offer a means to reduce manpower impacts of perimeter surveillance. The unit can deplo...

B. J. Williford

2012-01-01

176

Roam: A Scalable Replication System for Mobile and Distributed Computing  

Microsoft Academic Search

of the DissertationRoam: A Scalable Replication Systemfor Mobile and Distributed ComputingbyDavid Howard RatnerDoctor of Philosophy in Computer ScienceUniversity of California, Los Angeles, 1998Professor Gerald J. Popek, Co-chairProfessor W. W. Chu, Co-chairMobile computing is rapidly becoming a way of life. Users carry their laptops,PDAs, and other portable devices with them almost constantly, whethertheir mobility takes them across town or across the

David Howard Ratner

1997-01-01

177

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

178

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

179

Mobile Phones in Africa: How Much Do We Really Know?  

ERIC Educational Resources Information Center

Mobile phones are a crucial mode of communication and welfare enhancement in poor countries, especially those lacking an infrastructure of fixed lines. In recent years much has been written about how mobile telephony in Africa is rapidly reducing the digital divide with developed countries. Yet, when one examines the evidence it is not at all…

James, Jeffrey; Versteeg, Mila

2007-01-01

180

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

181

Discovery and Integration of Mobile Communications in Everyday Life  

Microsoft Academic Search

We report on the results of a study in which 19 new mobile telephone users were closely tracked for the first six weeks after service acquisition. Results show that novices tend to rapidly modify their perceptions of social appropriateness around mobile phone use, that actual nature of use frequently differs from initial predictions, and that comprehension of service-based technologies can

Leysia Palen; Marilyn C. Salzman; Ed Youngs

2001-01-01

182

Going wireless: behavior & practice of new mobile phone users  

Microsoft Academic Search

We report on the results of a study in which 19 new mobile phone users were closely tracked for the first six weeks after service acquisition. Results show that new users tend to rapidly modify their perceptions of social appropriateness around mobile phone use, that actual nature of use frequently differs from what users initially predict, and that comprehension of

Leysia Palen; Marilyn C. Salzman; Ed Youngs

2000-01-01

183

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

184

Semantic Analysis and Personalization for Mobile Media Applications  

Microsoft Academic Search

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

Changsheng Xu; Qi Tian

2007-01-01

185

IP address assignment in a mobile ad hoc network  

Microsoft Academic Search

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

Mansoor Mohsin; Ravi Prakash

2002-01-01

186

Geolocation Technology and Local Information in Mobile Telephony  

Microsoft Academic Search

Geographical location (geolocation) technology as applied to mobile telephony is currently rapidly advancing. The geographical location data concerning mobile phone users can be effectively utilized to provide local information. The first geographical positioning service in Japan using the Personal Handyphone System (PHS) started in 1998. This service has been applied to security services for children, elders, emergency purposes and the

Yoshio Arai

187

Network Formation for Provision of Mobile Information and Entertainment Services  

Microsoft Academic Search

The mobile telecommunications industry is undergoing rapid change, which is increasing the interdependency of firms in the sector. This trend increases the likelihood that mobile information and entertainment services will be delivered through inter-organizational networks of firms. These networks are the topic of this research. In this research we examine network formation and the influence of business models on this

Uta de Montalvo; Carleen Maitland; Elisabeth van de Kar

2003-01-01

188

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

189

A cloud based SIM DRM scheme for the mobile internet  

Microsoft Academic Search

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

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

2010-01-01

190

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

191

MMM2: mobile media metadata for media sharing  

Microsoft Academic Search

Cameraphones are rapidly becoming a global platform for everyday digital imaging especially for networked sharing of media from mobile devices. However, their constrained user interfaces and the current network and application infrastructure encumber the basic tasks of transferring, finding, and sharing captured media. We have deployed a prototype context-aware cameraphone application for mobile media sharing (MMM2) that aims to overcome

Marc Davis; Nancy A. Van House; Jeffrey Towle; Simon King; Shane Ahern; Carrie Burgener; Dan Perkel; Megan Finn; Vijay Viswanathan; Matthew Rothenberg; Scott Fisher; Nick Reid

2005-01-01

192

Exploring the acceptance of mobile auctions in China  

Microsoft Academic Search

The growth of mobile phone usage and online auctions in China has been extremely rapid. Recently, these trends have started to converge, as online auctions players such as Eachnet (eBay China) try to diversify and gain competitive advantage via the creation of mobile auctions. Although relatively embryonic, the potential for this new business model is immense. With this in mind,

Shuo Wang; Stuart Barnes

2007-01-01

193

Intelligence and class mobility in the British population  

Microsoft Academic Search

Performance on intelligence tests is known to be associated with class mobility, with high scorers tending to move up the socio-economic hierarchy, andlow scorers tending to move down. However, much remains unknown about the association. It is possible that the importance of intelligence varies across different occupational areas, or that there is friction acting against mobility, such that a person

Daniel Nettle

2003-01-01

194

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

195

A model for resource specification in mobile services  

Microsoft Academic Search

The proliferation of small devices and the increase in number of services created by various vendors for such devices have made SOA a primary choice for mobile software developers. However, due to software and hardware platforms heterogeneity, it is not always possible to use the write-once, use-everywhere approach. The main problem comes due to the varying capability of mobile devices

Hamid Mukhtar; Djamel Belaïd; Guy Bernard

2008-01-01

196

Measuring and assessing researcher mobility from CV analysis: the case of the Ramón y Cajal programme in Spain  

Microsoft Academic Search

Relying on the international literature on CV-based indicators, we select a sample of CVs from researchers applying to the Spanish Ramón y Cajal programme to assess mobility patterns and look for evidence of links between mobility and research performance. Evidence is found that mobility patterns vary across disciplines and that most internationally mobile researchers seem to have better access to

Carolina Cañibano; Javier Otamendi; Inés Andújar

2008-01-01

197

MOBILE LABORATORY FOR BACILLUS ANTHRACIS DETECTION  

Technology Transfer Automated Retrieval System (TEKTRAN)

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

198

Mobile augmented reality: design issues and opportunities  

Microsoft Academic Search

With the rapid evolution of mobile devices, smart-phones in particular, comes the ability to create new experiences that enhance the way we see, interact, and express ourselves, within the world that surrounds us. We can blend data from our senses and our devices in myriad ways that simply weren't possible before. This workshop explores the current and future state of

Marco de Sa; Elizabeth F. Churchill; Katherine Isbister

2011-01-01

199

Tactical Mobile Mesh Network System Design  

Microsoft Academic Search

Tactical mobile mesh systems are wireless communication networks characterized by: harsh propagation channels and interference, frequent and rapid changes in the network topology, the requirement for very robust, low latency multimedia information decimation, and no centralized network control. In this paper we describe a technology testbed designed to address these challenges. The testbed is based on advanced waveform technologies, modern

Adam Blair; Thomas Brown; Keith M. Chugg; Mark Johnson

2007-01-01

200

Acceptable Download Times in the Mobile Internet  

Microsoft Academic Search

The web is becoming more and more graphical and the average size of pages has been growing during the years. Most users enjoy fast download of heavy pages, and the experience of using the web is highly visual. The mobile Internet, e.g. WAP or i-Mode, provides a considerably more limited environment for Internet usage. Although bigger colour displays are rapidly

Virpi Roto; Anne Kaikkonen

2003-01-01

201

Mobile phone in the Chain of Survival  

Microsoft Academic Search

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

Ivor Kovic; Ileana Lulic

2011-01-01

202

Mobile Game Based Learning: Designing a Mobile Location Based Game  

NASA Astrophysics Data System (ADS)

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

Schadenbauer, Sandra

203

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

204

Spatial Renormalization of Human Mobility Networks  

NASA Astrophysics Data System (ADS)

Research on human mobility networks relies on the definition of vertices (locations) and weighted links that reflect the traffic between them. Typically, the appropriate choice of spatial scale for vertices (e.g. cities, counties, regions, etc.) is arbitrary and not given by the problem at hand. It is a priori unclear how statistical and topological features depend on these choices. We investigate multi-scale human mobility networks in response to spatial renormalization, in which the spatial scale is systematically varied as vertices are locally merged to form larger meta-nodes. As a proxy for human mobility we employ the network of flux of geo-trackable items between a set of registered geographic locations (geocaches) for the US and Europe. On the finest scale these networks are sparsely connected and homogeneous, while they converge by spatial renormalization to networks with broad, invariant weight and flux distributions, potentially revealing the origin of these universal features of real human mobility networks.

David, Vincent J.; Brockmann, Dirk

2010-03-01

205

Rapid host nation medical deployment.  

PubMed

Rapid development of land-based units in Operation Desert Shield/Storm presented critical needs for medical support. Integration of small Navy mobile medical teams in Bahrain and a larger United States Army Hospital unit in Riyadh, Saudi Arabia, at host nation hospitals presented an innovative method of providing this support. The success of these ventures in convenience and quality of care establishes the host nation interaction with military medical professionals as a workable, satisfying, and important adjunct to standard military medical care. PMID:1470355

Ludwig, F E; Horak, B J; Wallace, M R; Deafenbaugh, M K

1992-11-01

206

Streaming mobile augmented reality on mobile phones  

Microsoft Academic Search

Continuous recognition and tracking of objects in live video cap- tured on a mobile device enables real-time user interaction. We demonstrate a streaming mobile augmented reality system with 1 second latency. User interest is automatically inferred from camera movements, so the user never has to press a button. Our system is used to identify and track book and CD covers

David M. Chen; Sam S. Tsai; Ramakrishna Vedantham; Radek Grzeszczuk; Bernd Girod

2009-01-01

207

Streaming mobile augmented reality on mobile phones  

Microsoft Academic Search

Continuous recognition and tracking of objects in live video captured on a mobile device enables real-time user interaction. We demonstrate a streaming mobile augmented reality system with 1 second latency. User interest is automatically inferred from camera movements, so the user never has to press a button. Our system is used to identify and track book and CD covers in

D. M. Chen; Sam S. Tsai; Ramakrishna Vedantham; Radek Grzeszczuk; Bernd Girod

2009-01-01

208

Aeronautical Mobile Satellite Experiment.  

National Technical Information Service (NTIS)

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 de...

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

1990-01-01

209

Ion mobility sensor system  

DOEpatents

An ion mobility sensor system including an ion mobility spectrometer and a differential mobility spectrometer coupled to the ion mobility spectrometer. The ion mobility spectrometer has a first chamber having first end and a second end extending along a first direction, and a first electrode system that generates a constant electric field parallel to the first direction. The differential mobility spectrometer includes a second chamber having a third end and a fourth end configured such that a fluid may flow in a second direction from the third end to the fourth end, and a second electrode system that generates an asymmetric electric field within an interior of the second chamber. Additionally, the ion mobility spectrometer and the differential mobility spectrometer form an interface region. Also, the first end and the third end are positioned facing one another so that the constant electric field enters the third end and overlaps the fluid flowing in the second direction.

Xu, Jun; Watson, David B.; Whitten, William B.

2013-01-22

210

Intelligent Mobility Laboratory.  

National Technical Information Service (NTIS)

This report documents activities to develop and equip a laboratory for robot mobility research and development. The laboratory includes mobile robots, testing systems, instrumentation, analysis tools, as well as test and analysis procedures. Robot mobilit...

G. Witus

2006-01-01

211

Zhang Neural Network Versus Gradient Neural Network for Online Time-Varying Quadratic Function Minimization  

Microsoft Academic Search

With the proved efficacy on solving linear time-varying matrix or vector equations, Zhang neural network (ZNN) could be generalized\\u000a and developed for the online minimization of time-varying quadratic functions. The minimum of a time-varying quadratic function\\u000a can be reached exactly and rapidly by using Zhang neural network, as compared with conventional gradient-based neural networks\\u000a (GNN). Computer-simulation results substantiate further that

Yunong Zhang; Zhan Li; Chenfu Yi; Ke Chen

2008-01-01

212

An empirical study of the effects of permission on mobile advertising effectiveness  

Microsoft Academic Search

Advertisers are now enjoying the next stage of marketing where the mobile medium plays a significant role as a means of commercial communications. The effectiveness of this new channel can be witnessed through the rise in popularity of mobile advertising. The underlying reasons for this phenomenon could be the rapid proliferation of mobile platforms and the unique characteristics inherent in

Phumisak Smutkupt; Donyaprueth Krairit; Vatcharaporn Esichaikul

2010-01-01

213

Greening academia: Use and disposal of mobile phones among university students  

Microsoft Academic Search

Mobile phones have relatively short lifecycles and are rapidly seen as obsolete by many users within little over a year. However, the reusability of these devices as well as their material composition means that in terms of mass and volume, mobile phones represent the most valuable electronic products that are currently found in large numbers in waste streams. End-of-life mobile

F. O. Ongondo; I. D. Williams

2011-01-01

214

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

215

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

Microsoft Academic Search

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

Gerald Reiner; Martin Natter

2007-01-01

216

Telecommunications: Exposure and Testing Requirements for Mobile Phones Should Be Reassessed.  

National Technical Information Service (NTIS)

The rapid adoption of mobile phones has occurred amidst controversy over whether the technology poses a risk to human health as a result of long-term exposure to RF energy from mobile phone use. FCC and FDA share regulatory responsibilities for mobile pho...

2012-01-01

217

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

218

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

219

Using RSS to support mobile learning based on media richness theory  

Microsoft Academic Search

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 environment based on media richness theory. Regarding the

Yu-Feng Lan; Yang-Siang Sie

2010-01-01

220

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

221

Researches on interactive design of touch-screen mobile TV software interface based on CMMB technology  

Microsoft Academic Search

The rapid development of mobile internet facilitates the popularization and convenience in access to the internet by individual mobile equipments. More and more people are using individual mobile equipments for realizing specific functions: such as browsing web pages, watching TV, searching information which used to be realized in specific location and so on. Since more and more people are using

Yonghai Yu; Xiajun Huang; Bing Xu

2010-01-01

222

Research and development of the mobile library based on WAP technology  

Microsoft Academic Search

With the development of information technology, the traditional library service model has been difficult to satisfy user needs. In recent years, the rapid development of mobile devices provides a good platform for the expansion of library services. Therefore, using WAP Web technology to design and implement a function of more sophisticated mobile library system become possible. The mobile libraries based

Hong Yue

2010-01-01

223

MOSAIC - A Mobile Peer-to-Peer Networks-Based 3D Streaming Supplying Partner Protocol  

Microsoft Academic Search

The rapid spread of wireless mobile devices and the advances of wireless communication have fueled the interest about streaming 3D graphics on mobile devices to be used in augmented reality based classes of applications. In these types of applications, a real world is mapped into the virtual world and thin mobile devices are employed to navigate in the virtual simulated

Haifa Raja Maamar; Azzedine Boukerche; Emil M. Petriu

2010-01-01

224

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

225

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

226

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…

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

2008-01-01

227

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

Microsoft Academic Search

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

Jing Tan; Jiayin Qi

2009-01-01

228

Decoding the Miss Daisy Syndrome: An Examination of Subjective Responses to Mobility Change  

Microsoft Academic Search

The subjective responses associated with personal life space and mobility status were explored. Thirty individuals participated in focus groups based on self-rated disability status, current places visited, and availability. Qualitative analyses revealed that most participants equated personal mobility with driving a vehicle. Attitudes concerning mobility status and preparedness for change varied based on disability level and personal experience. Fear of

M. Denise King; Thomas M. Meuser; Marla Berg-Weger; John T. Chibnall; Annie C. Harmon; Richard Yakimo

2010-01-01

229

Mobility and Young Children.  

ERIC Educational Resources Information Center

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

Bernard van Leer Foundation Newsletter, 1994

1994-01-01

230

Teleporting - Mobile X Sessions  

Microsoft Academic Search

This paper examines issues involved in making an X session mobile. A mobile X sessionis one which is not fixed to a particular X display, but can be materialised on demand atany suitable display. The Teleporting System developed at Olivetti Research Laboratory(ORL) is a tool for experiencing mobile X sessions. It provides a familiar, personalisedway of making temporary use of

Tristan Richardson

1995-01-01

231

Vehicular Mobile Commerce  

Microsoft Academic Search

Growing interest in mobile commerce among users, service providers, content developers, businesses, and researchers has spawned many new applications ncluding location-based services, mobile financial services, multiparty interactive games, and mobile auctions. Most of these applications are designed to be accessible via personal digital assistants or cell phones, but handhelds have limited capabilities and are impractical or dangerous to use while

Upkar Varshney

2004-01-01

232

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

233

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

234

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

235

Mobility control agents  

Microsoft Academic Search

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

E. C. Hammershaimb; V. A. KuugKraa

1983-01-01

236

Complex Mobile Multiagent Systems  

Microsoft Academic Search

Mobile agents as network computing technology has been applied to solve various parallel and distributed computing problems, including parallel processing, information search and network management. Protection of the mobile agents in the network and against the hosts is a difficult task. In this paper, we analyze the increased security solutions provided by a novel class of mobile agents called ICMA

Barna László Iantovics; Bogdan Crainicu

2008-01-01

237

Seattle's Mobile City Project  

Microsoft Academic Search

The City of Seattle's pioneering Mobile City Government Project has received wide attention, since it promises greatly improved fieldwork operations in local government. Three years into operation and with another fieldwork unit in the process of adopting mobile applications, our research studies the work domains of the units involved to better understand the premises, requirements, and effects of fully mobile,

Raya Fidel; Jens-Erik Mai; Kristene Unsworth

238

Analysis of Mobile Data Service Value Chain Based on Two-sided Markets Theory  

Microsoft Academic Search

In recent years, due to the rapid evolution of communication technology , the mobile data service is a newly emerging and rapid developing segment. Waning ARPU pushes the telecommunication operators to search for other sources of income. Mobile data services were expected to foster Industry growth. As to the brilliant prospect for data services, many industries expect to join this

Wang Yan; Lu Ting-jie

2007-01-01

239

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

Microsoft Academic Search

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

Ali Grami; Bernadette Schell

2004-01-01

240

Singularities of varying light speed cosmologies  

Microsoft Academic Search

We study the possible singularities of isotropic cosmological models that have a varying speed of light as well as a varying gravitational constant. The field equations typically reduce to two dimensional systems which are then analyzed both by dynamical systems techniques in phase space and by applying the method of asymptotic splittings. In the general case we find initially expanding

John Miritzis; Spiros Cotsakis

2007-01-01

241

Path Flow Estimation Using Time Varying Coefficient State Space Model  

NASA Astrophysics Data System (ADS)

The dynamic path flow information is very crucial in the field of transportation operation and management, i.e., dynamic traffic assignment, scheduling plan, and signal timing. Time-dependent path information, which is important in many aspects, is nearly impossible to be obtained. Consequently, researchers have been seeking estimation methods for deriving valuable path flow information from less expensive traffic data, primarily link traffic counts of surveillance systems. This investigation considers a path flow estimation problem involving the time varying coefficient state space model, Gibbs sampler, and Kalman filter. Numerical examples with part of a real network of the Taipei Mass Rapid Transit with real O-D matrices is demonstrated to address the accuracy of proposed model. Results of this study show that this time-varying coefficient state space model is very effective in the estimation of path flow compared to time-invariant model.

Jou, Yow-Jen; Lan, Chien-Lun

2009-08-01

242

Focusing SAR data with time-varying Doppler centroid  

NASA Astrophysics Data System (ADS)

SAR data spatially sampled at the Nyquist limit can be correctly processed if the Doppler centroid is precisely known. Whenever the Doppler centroid shows rapid variations either with range or azimuth, more care is required in order to take advantage of the computational efficiency of frequency domain techniques. In this paper it is shown that such focusing techniques can still be exploited, provided that SAR raw data are previously modified and a space-varying monodimensional filter is applied to the focused image. The computational cost increases, but it is still smaller than time-space domain processing. Results obtained with simulated SIR-C/X-SAR data and SPOTlight geometries are presented.

Prati, Claudio; Rocca, Fabio

1992-05-01

243

Global mobility approach with Mobile IP in \\  

Microsoft Academic Search

The purpose of the document is to describe how the EURESCOM project P1013 FIT-MIP evaluates the use of Mobile IP in an IP core network, acting as a mobility management protocol federating heterogeneous access network technologies such as PSTN, WLAN or GPRS. The aim is to provide a wide IP environment with an always-on access to IP applications (VoIP, VPN,

L. Morand; S. Tessier

2002-01-01

244

Mobile Technology, Crowdsourcing and Peace Mapping: New Theory and Applications for Conflict Management  

Microsoft Academic Search

\\u000a This chapter develops a conceptual framework to highlight how mobile technologies can play a role in preventing, resolving\\u000a and containing conflict. The rapid and worldwide proliferation of mobile phones means that access to mobile communication\\u000a is far higher than access to the Internet. We draw on The Third Side (3S) framework for conflict management to demonstrate\\u000a how mobile technology, crowdsourcing

Jessica Heinzelman; Rachel Brown; Patrick Meier

245

2D IR provides evidence for mobile water molecules in ?-amyloid fibrils  

PubMed Central

The motion of water molecules close to amide groups causes their vibrational frequencies to vary rapidly in time. These variations are uniquely sensed by 2-dimensional infrared spectroscopy (2D IR). Here, it is proposed from 2-dimensional experiments on fibrils of amyloid ? (A?)40 that there are water molecules in the fibrils. The spatial locations of the water (D2O) were inferred from the responses of 18 amide modes of A?40 labeled with 13C = 18O. Fast frequency variations were found for residues L17 and V18 and for the apposed residues L34 and V36, suggesting cavities or channels containing mobile water molecules can form between the 2 sheets. Spectroscopic analysis showed that there are 1.2 water molecules per strand in the fibrils. The 13C = 18O substitution of 1 residue per strand creates a linear array of isotopologs along the fibril axis that manifests clearly identifiable vibrational transitions. Here, it is shown from the distributions of amide-I? vibrational frequencies that the regularity of these chains is strongly residue dependent and in most cases the distorted regions are also those associated with the putative mobile water molecules. It is proposed that A?40 fibrils contain structurally significant mobile water molecules within the intersheet region.

Kim, Yung Sam; Liu, Liu; Axelsen, Paul H.; Hochstrasser, Robin M.

2009-01-01

246

2D IR provides evidence for mobile water molecules in beta-amyloid fibrils.  

PubMed

The motion of water molecules close to amide groups causes their vibrational frequencies to vary rapidly in time. These variations are uniquely sensed by 2-dimensional infrared spectroscopy (2D IR). Here, it is proposed from 2-dimensional experiments on fibrils of amyloid beta (Abeta)40 that there are water molecules in the fibrils. The spatial locations of the water (D(2)O) were inferred from the responses of 18 amide modes of Abeta40 labeled with (13)C = (18)O. Fast frequency variations were found for residues L17 and V18 and for the apposed residues L34 and V36, suggesting cavities or channels containing mobile water molecules can form between the 2 sheets. Spectroscopic analysis showed that there are 1.2 water molecules per strand in the fibrils. The (13)C = (18)O substitution of 1 residue per strand creates a linear array of isotopologs along the fibril axis that manifests clearly identifiable vibrational transitions. Here, it is shown from the distributions of amide-I' vibrational frequencies that the regularity of these chains is strongly residue dependent and in most cases the distorted regions are also those associated with the putative mobile water molecules. It is proposed that Abeta40 fibrils contain structurally significant mobile water molecules within the intersheet region. PMID:19815514

Kim, Yung Sam; Liu, Liu; Axelsen, Paul H; Hochstrasser, Robin M

2009-10-08

247

Sustainable mobility in rural China.  

PubMed

Rural areas in China suffer from various problems. The stagnating economic development and a lack of (sufficient) job opportunities and basic services, etc., lead to disadvantages for great parts of China's population. In this context, the transport sector plays a crucial role for the development of rural settlements. Although the degree of undersupply varies between villages, the situation of Chinese villages is often worsened by an insufficient developed transport sector. Regarding mobility in rural China, major constraints and therefore challenges are the difficult access to the transport infrastructure, bad road conditions and the lack of public transport systems. Improvements within the transport sector can be regarded as crucial for the economic and social development of (rural) China and should be carried out in a sustainable and holistic manner using participatory approaches. The aim should be the development of mobility strategies considering the specific needs within the field of transport, which shall have a decisive and positive impact on related sectors. This paper is based on experiences made during the 3 years lasting Sino-European research project SUCCESS (Sustainable Users Concept for China Engaging Scientific Scenario) that analyses the present and the potential future role of transport systems in selected rural areas of China. Referring to the case studies of three villages in rural China, some mobility-related projects that present a favourable impact not only on the transport sector but also on the social system and the economy shall be highlighted. Finally, based on the analysis, instruments and measures for the development of a pathway to a sustainable mobility in rural China will be outlined. PMID:17977642

Dalkmann, Holger; Hutfilter, Sabine; Vogelpohl, Karin; Schnabel, Peter

2007-10-30

248

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

249

Youth, mobility and mobile phones in Africa: findings from a three-country study  

Microsoft Academic Search

The penetration of mobile phones into sub-Saharan Africa has occurred with amazing rapidity: for many young people, they now represent a very significant element of their daily life. This paper explores usage and perceived impacts among young people aged c. 9–18 years in three countries: Ghana, Malawi and South Africa. Our evidence comes from intensive qualitative research with young people,

Gina Porter; Kate Hampshire; Albert Abane; Alister Munthali; Elsbeth Robson; Augustine Tanle

2012-01-01

250

Changes in Soil Minerology Reduce Phosphorus Mobility During Anoxic Soil Conditions  

NASA Astrophysics Data System (ADS)

Phosphorus (P) transfer from the landscape to receiving waters is an important environmental concern because these diffuse losses may cause widespread water quality impairments which can accelerate freshwater eutrophication. Phosphorus (P) mobilization from soil to surface and subsurface flow paths is controlled by numerous factors, and thus it can vary greatly with time and landscape scale. To determine whether P mobilization during soil saturation in the landscape was caused or controlled by complexation, iron reduction or ligand exchange, experiments were carried out to better characterize the interrelationships of varying P sources with dissolved organic carbon (DOC) and soil anoxic conditions. The soil incubation experiments consisted of treatments with distilled water, 5 mM acetic acid (HAc), 0.05% humic acid (HA) and glucose (40 mM) at 26 o C under anaerobic conditions to isolate effects of the various P exchange processes. The experimental results suggest that during soil saturation, the loosely bound P, which is primarily associated with iron oxyhydroxides, was mobilized by both reduction and complexation processes. Good correlations were observed between ferrous iron (Fe+2) and DOC, and between total dissolved phosphorus (TDP) and DOC, facilitating P desorption to the soil water. The anaerobic soil conditions with different P sources also indicated that mineralization facilitated P mobility, mainly due to chelation (humics and metabolites) and as a result of the bio-reduction of iron when fresh litter and grass were present. The organic P sources which are rich in carbohydrate and cellulose and that undergo fermentation due to the action of lactate forming organisms also caused a release of P. The easily metabolizable DOC sources lead to intensive bio-reduction of soil with the release of Fe, however this did not necessarily appear to cause more TDP in the soil solution. The varying P additions in soils with water, HAc and glucose (40mm) before and after soil incubation showed higher P sorption than aerobic soil due to reduced iron (Fe+2) - P mineral formation. Some of the readily available P in the soil solution tended to co-precipitate quickly with Fe, Al, Ca, and Mn, but it also resulted in the formation of earthy masses of vivianite [Fe2+3(PO4)2 . 8 H20], thus almost completely immobilizing P. These findings suggest that where conditions in the landscape are saturated, but remain stagnant for extended time periods, P additions may not necessarily enhance leaching once hydrological transport resumes. The temporal nature of P mobilization processes combined with rapid (i.e., preferential flow) hydrological transport appears to have a more important role in controlling P transport through the landscape.

Giri, S. K.; Geohring, L. D.; Richards, B. K.; Walter, M.; Steenhuis, T. S.

2008-05-01

251

New, Varying-Capacitance, Electrical Machine,  

National Technical Information Service (NTIS)

The research demonstrated that introduction of dielectric material into the working gap of a varying capacitance, rotating machine, in combination with a novel arrangement of machine elements, increased the power of the machine by an order of magnitude. U...

S. F. Philp

1983-01-01

252

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.

253

Autonomous mobile platform II  

Microsoft Academic Search

The paper presents design of autonomous mobile platform based on the all terrain 1\\/8th scale four wheel drive radio control model. In this paper was considered problem of automatic control of mobile platform using information from GPS system, electronic compass and encoder. The mobile platform is equipped in two-stroke glow engine, heavy-duty drive train and wide-track suspension and controller based

Krzysztof Jaskot; Artur Babiarz

2011-01-01

254

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

255

Residential Mobility and Migration  

NSDL National Science Digital Library

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

Crowder, Kyle

2009-02-16

256

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

257

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

258

Time-Varying Graphs and Dynamic Networks  

Microsoft Academic Search

The past few years have seen intensive research efforts carried out in some\\u000aapparently unrelated areas of dynamic systems - delay-tolerant networks,\\u000aopportunistic-mobility networks, social networks - obtaining closely related\\u000ainsights. Indeed, the concepts discovered in these investigations can be viewed\\u000aas parts of the same conceptual universe; and the formal models proposed so far\\u000ato express some specific concepts

Arnaud Casteigts; Paola Flocchini; Walter Quattrociocchi; Nicola Santoro

2010-01-01

259

Exploring the mobility of mobile phone users  

NASA Astrophysics Data System (ADS)

Mobile phone datasets allow for the analysis of human behavior on an unprecedented scale. The social network, temporal dynamics and mobile behavior of mobile phone users have often been analyzed independently from each other using mobile phone datasets. In this article, we explore the connections between various features of human behavior extracted from a large mobile phone dataset. Our observations are based on the analysis of communication data of 100,000 anonymized and randomly chosen individuals in a dataset of communications in Portugal. We show that clustering and principal component analysis allow for a significant dimension reduction with limited loss of information. The most important features are related to geographical location. In particular, we observe that most people spend most of their time at only a few locations. With the help of clustering methods, we then robustly identify home and office locations and compare the results with official census data. Finally, we analyze the geographic spread of users' frequent locations and show that commuting distances can be reasonably well explained by a gravity model.

Csáji, Balázs Cs.; Browet, Arnaud; Traag, V. A.; Delvenne, Jean-Charles; Huens, Etienne; Van Dooren, Paul; Smoreda, Zbigniew; Blondel, Vincent D.

2013-03-01

260

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

261

Telecommunications: Direct Broadcast Satellite Subscribership Has Grown Rapidly, But Varies Across Different Types of Markets.  

National Technical Information Service (NTIS)

Since its introduction in 1994, direct broadcast satellite (DBS) service has grown dramatically, and this service is now the principal competitor to cable television service. Although DBS service has traditionally been a rural service, passage of the Sate...

2005-01-01

262

Mobile health systems: a brief overview  

NASA Astrophysics Data System (ADS)

Rapid advances in information technology and telecommunications, and more specifically wireless and mobile communications, and their convergence (telematics) are leading to the emergence of a new type of information infrastructure that has the potential of supporting an array of advanced services for healthcare. The objective of this paper is to provide a snapshot of the applications of mobile technology in healthcare. A brief review of the spectrum of these applications and the potential benefits of these efforts will be presented, followed by success case studies in electronic patient record, emergency telemedicine, teleradiology, and home monitoring. It is anticipated that the progress carried out in these efforts, and the potential benefits of emerging mobile technologies will trigger the development of more applications, thus enabling the offering of a better service to the citizen.

Voskarides, S.; Pattichis, Constantinos S.; Habib Istepanian, Robert S.; Kyriacou, E.; Pattichis, Marios S.; Schizas, C. N.

2002-06-01

263

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

264

Database Classification of Mobile Devices  

Microsoft Academic Search

Mobile devices can be categorized into three categories: mobile phones, PDAs (personal digital assistant) and smart phones. All of them play an important role for mobile services because they are the interface to the users. Currently there is no consistent methodology to describe mobile devices. This project shows an approach to describe mobile devices. The result is a database with

Sebastian Gansemer; Uschi Gröner; Manuel Maus

2007-01-01

265

Mutual selection in time-varying networks  

NASA Astrophysics Data System (ADS)

Time-varying networks play an important role in the investigation of the stochastic processes that occur on complex networks. The ability to formulate the development of the network topology on the same time scale as the evolution of the random process is important for a variety of applications, including the spreading of diseases. Past contributions have investigated random processes on time-varying networks with a purely random attachment mechanism. The possibility of extending these findings towards a time-varying network that is driven by mutual attractiveness is explored in this paper. Mutual attractiveness models are characterized by a linking function that describes the probability of the existence of an edge, which depends mutually on the attractiveness of the nodes on both ends of that edge. This class of attachment mechanisms has been considered before in the fitness-based complex networks literature but not on time-varying networks. Also, the impact of mutual selection is investigated alongside opinion formation and epidemic outbreaks. We find closed-form solutions for the quantities of interest using a factorizable linking function. The voter model exhibits an unanticipated behavior as the network never reaches consensus in the case of mutual selection but stays forever in its initial macroscopic configuration, which is a further piece of evidence that time-varying networks differ markedly from their static counterpart with respect to random processes that take place on them. We also find that epidemic outbreaks are accelerated by uncorrelated mutual selection compared to previously considered random attachment.

Hoppe, K.; Rodgers, G. J.

2013-10-01

266

Rapid Deployment UAV  

Microsoft Academic Search

Besides UCAV, present winged or helicopter-style UAVs waste too much time and fuel to takeoff and arrive an unpredicted trouble spot. This study presents two design concepts of rapid deployment UAV: the first is vertical launch surface-based rapid deployment UAV (RDUAV), and the second is air-launched rapid deployment UAV (AL-RDUAV). The proposed rapid deployment UAVs should rapidly reach the destination

Shun-Wen Cheng

2008-01-01

267

Adaptive Mobile Learning  

Microsoft Academic Search

This paper presents a general framework for adaptive mobile learning. The mobile learner performs an educational activity using the infrastructure (e.g. handheld devices, networks) in an environment (e.g. outdoors). An adaptation engine personalizes the educational activity and the infrastructure to the learner according to the context. The adaptation engine may be deterministic or probabilistic. Learning automata are employed as probabilistic

Anastasios A. Economides

2006-01-01

268

Mobile teens in Taiwan  

Microsoft Academic Search

Abstract Research in Japan (Ito, 2005), Norway (Ling, 2004) and United Kingdom (Green 2001) has shown that parents use a mobile phone to remotely monitor children’s activities and teens who live at home use the mobile phone to gain their freedom from parental control. On the other hand, Chen and Katz (2009) find that American college students show more ,desire

Yi-Fan Chen

269

Mobile marketing to millennials  

Microsoft Academic Search

Discusses the relevance of mobile phone technology in marketing to young consumers aged between 18 and 22; these are the millennials who are heavy mobile phone users and often the architects of change in US culture. Shows how permission is vital in connecting with these consumers interactively: they do not hate all advertising, but they hate “spim”, which is receiving,

Mitch McCasland

2005-01-01

270

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

271

On indexing mobile objects  

Microsoft Academic Search

We show how to index mobile objects in one and two di- mensions using efficient dynamic external memory data structures. The problem is motivated by real life appli- cations in traffic monitoring, intelligent navigation and mobile communications domains. For the l-dimensional case, we give (i) a dynamic, external memory algo- rithm with guaranteed worst case performance and lin- ear space

George Kollios; Dimitrios Gunopulos; Vassilis J. Tsotras

1999-01-01

272

Sequence Diagrams for Mobility  

Microsoft Academic Search

There are several kinds of UML diagrams for convenient modelling of behaviour, but these diagrams can be hardly used for modelling mobility. The situa- tion is not very different in the case of agent languages. There exist already some pro- posals for modelling mobility of interacting agents by graphical notations, but these notations are rather not very intuitive and hard

Piotr Kosiuczenko

2002-01-01

273

Landscape, mobility, practice  

Microsoft Academic Search

This paper is an edited transcript of a panel discussion on ‘Landscape, Mobility and Practice’ which was held at the Royal Geographical Society (with the Institute of British Geographers) Annual Conference in September 2006. In the paper the panel engage with the work of geographers and others who have been drawing upon theories of practice to explore issues of mobility

Peter Merriman; George Revill; Tim Cresswell; Hayden Lorimer; David Matless; Gillian Rose; John Wylie

2008-01-01

274

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

275

Occupational Mobility of Workers  

ERIC Educational Resources Information Center

|The Special Labor Force Report shows that 8.7 percent of workers changed occupations between January, 1972, and January, 1973. The article discusses and tabulates data related to current patterns of mobility; demographic characteristics; flows among occupations; distribution by age, sex, and race; and job and industrial mobility. (Author/MW)|

Byrne, James J.

1975-01-01

276

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…

Panettieri, Joseph C.

2007-01-01

277

Mobile satellite communications  

NASA Astrophysics Data System (ADS)

Mobile satellite communications is placed in a global perspective with attention focused on the various commercial systems currently available and those recently proposed. The technology behind the systems is discussed as well as military applications. Mobiles are also examined in terms of commercial competition and politics.

278

Mobile Libraries in Finland  

Microsoft Academic Search

Mobile libraries can be seen as part of the former Finnish regional policy. Until recently, it has been an official policy in Finland to keep the whole country populated. Cultural and information services are one of the means to reach this goal. In a sparsely populated country like Finland, some services are even put on wheels; mobile libraries are an

Tuula Haavisto

1994-01-01

279

Harnessing the Mobile Revolution  

Microsoft Academic Search

The premise of this essay is that the explosive growth of mobile communications can be a powerful tool for addressing some of the most critical challenges of the 21st century, such as promoting vibrant democracies, fostering inclusive economic growth, and reducing the huge inequities in life expectancy between rich and poor nations. The benefits of mobile communications are particularly profound

Thomas Kalil

2009-01-01

280

Visions of Mobile Learning  

ERIC Educational Resources Information Center

|It is almost a foregone conclusion that the mobile device will become an indispensable tool for learning in the future. That's why "T.H.E. Journal" asked a number of educators to let their imaginations go wild and conjure up visions of the future of the device in the classroom. This paper presents the views of educators who conjure up the mobile

T.H.E. Journal, 2011

2011-01-01

281

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

282

Mobile proactive secret sharing  

Microsoft Academic Search

Abstract This thesis describes mobile proactive secret sharing (MPSS), an extension of proac- tive secret sharing. Mobile proactive secret sharing is much more flexible than proac- tive secret sharing in terms of group membership: instead of the group of shareholders being exactly the same from one epoch to the next, we allow the group to change arbitrarily. In addition, we

David A. Schultz; Barbara Liskov; Moses Liskov

2008-01-01

283

Mobile Augmented Reality Applications  

Microsoft Academic Search

Augmented reality have undergone considerable improvement in past years. Many special techniques and hardware devices were developed, but the crucial breakthrough came with the spread of intelligent mobile phones. This enabled mass spread of augmented reality applications. However mobile devices have limited hardware capabilities, which narrows down the methods usable for scene analysis. In this article we propose an augmented

David Prochazka; Michael Stencl; Ondrej Popelka; Jiri Stastny

2011-01-01

284

Collocated mobile collaboration  

Microsoft Academic Search

Mobile devices have changed, and continue to shape, the world in which we live. When these devices were first introduced they were most often used in isolation to schedule appointments, take notes, play games, or view or edit pictures and stories. The extent of the collaboration on these mobile devices was to make phone calls, which has led to their

Jerry Alan Fails; Allison Druin; Mona Leigh Guha

2009-01-01

285

Intergenerational Mobility in China  

Microsoft Academic Search

In this paper, I study the intergenerational mobility of education and income in China. Using the CHNS database which gives information on parental educational attainment and income level, I show that there is a relatively high intergenerational mobility in China, compared to other developed and developing countries. Even if parents' social characteristics influence the child's ones, the transmission of parents'

Kelly LABAR

2007-01-01

286

Mental mobilization processes in critical incident stress situations.  

PubMed

In this article, the psychological emergency mobilization process that takes place in threat situations is postulated. Mental mobilization is the increased mental capability of the mind in critical situations to process incoming and stored information to enable adaptive survival responses. The processes that are mobilized in the service of survival are enhanced sensory awareness, focused attention, rapid processing of incoming data, and use of previous experience, enhanced memory, altered time perception, and temporary deactivation of emotional reactions. From a clinical standpoint, it is important that the survival value of these processes is understood, as survivors can be helped to feel a sense of accomplishment and empowerment when they are taken through a critical situation in a detailed way and discover that they have been able to function well and survive by use of their stored "experience," rapid processing of information or other aspects of their mental mobilization. PMID:11232176

Dyregrov, A; Solomon, R; Bassøe, C F

2000-01-01

287

Mobile Java objects  

NASA Astrophysics Data System (ADS)

In this paper we discuss the engineering requirements for adding object mobility to the Java programming language, and give an overview of the design and implementation of our mobile object system. We show that it is helpful to cluster objects for mobility, and that if these clusters represent untrusted pieces of code (for example, agents) then they must be encapsulated both to control their access and to control access to them. We show that managing large numbers of mobile objects in an open environment is a difficult problem, but has its roots in the management of large distributed name spaces. We propose an architecture for relocating moved objects that is both scaleable and tuneable. The mobile object system we describe has been implemented, and is currently in use as part of an ESPRIT agent project. We are currently evolving the design and implementation to provide additional security and distribution facilities.

Hayton, R. J.; Bursell, M. H.; Donaldson, D. I.; Harwood, W.; Herbert, A. J.

1999-03-01

288

Time-varying RCS modeling algorithms  

NASA Astrophysics Data System (ADS)

Teledyne Brown Engineering (TBE) has developed high-fidelity exoatmospheric time-varying radar cross section (RCS) models for use in the Warning Information Correlation (WIC) threat development effort. These models have been developed for the objects of six USSR ICBM and SIBM weapon systems. This report describes the five TBE developed time-varying RCS modeling algorithms that were utilized for these models. Part of the validation of these models consisted of comparisons of selected discrimination signatures calculated from model and recorded data. The definition of these signatures is also presented.

Gruner, W. J.

1981-12-01

289

Route optimization solution for nested mobile network in local mobility domain with multiple local mobility anchors  

Microsoft Academic Search

NEMO basic support protocol enables mobile networks preserve communication with other nodes, while changing their point of attachment to the Internet. But in nested mobile network, Pinball routing problem appears. In this paper, a route optimization solution for mobile networks based on local mobility management framework was proposed to improve the performance. By defining the operation on local mobility anchor,

Lu Li-hua; Ma Xiao-lei; Liu Yuan-an

2007-01-01

290

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

291

Mobile IP telephony: mobility support of SIP  

Microsoft Academic Search

The Internet has recently become the most important, most popular way of communication. A significant new feature of the Internet is the support of telephony. Two main competing signaling protocol standards have been developed for this purpose: H.323, proposed by the ITU, and SIP, proposed by the IETF. Another new feature for the Internet is the support of terminal mobility.

Melody Moh; Gregorie Berquin; Yanjun Chen

1999-01-01

292

MobileAds: advertisement on mobile devices  

Microsoft Academic Search

We study the requirements and challenges that arise in the mobile advertisement applications, which are more and more anticipated and will bring great societal and economic impact in the future. The goal of advertisement is to reach largest possible target population. Hence, we propose a reliable and robust message propagation protocol in this paper.

Wenbo He; Klara Nahrstedt

2008-01-01

293

Mobility of photosynthetic proteins.  

PubMed

The mobility of photosynthetic proteins represents an important factor that affects light-energy conversion in photosynthesis. The specific feature of photosynthetic proteins mobility can be currently measured in vivo using advanced microscopic methods, such as fluorescence recovery after photobleaching which allows the direct observation of photosynthetic proteins mobility on a single cell level. The heterogeneous organization of thylakoid membrane proteins results in heterogeneity in protein mobility. The thylakoid membrane contains both, protein-crowded compartments with immobile proteins and fluid areas (less crowded by proteins), allowing restricted diffusion of proteins. This heterogeneity represents an optimal balance as protein crowding is necessary for efficient light-energy conversion, and protein mobility plays an important role in the regulation of photosynthesis. The mobility is required for an optimal light-harvesting process (e.g., during state transitions), and also for transport of proteins during their synthesis or repair. Protein crowding is then a key limiting factor of thylakoid membrane protein mobility; the less thylakoid membranes are crowded by proteins, the higher protein mobility is observed. Mobility of photosynthetic proteins outside the thylakoid membrane (lumen and stroma/cytosol) is less understood. Cyanobacterial phycobilisomes attached to the stromal side of the thylakoid can move relatively fast. Therefore, it seems that stroma with their active enzymes of the Calvin-Benson cycle, are a more fluid compartment in comparison to the rather rigid thylakoid lumen. In conclusion, photosynthetic protein diffusion is generally slower in comparison to similarly sized proteins from other eukaryotic membranes or organelles. Mobility of photosynthetic proteins resembles restricted protein diffusion in bacteria, and has been rationalized by high protein crowding similar to that of thylakoids. PMID:23955784

Ka?a, Radek

2013-08-17

294

A Novel Design of Mobile IM System with Network Management  

Microsoft Academic Search

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

Yunxiang Gao; Chuangbai Xiao; Chaoqin Gao; Huiguang Chen

2009-01-01

295

Mobile health (mHealth) biomedical imaging paradigm.  

PubMed

Technology assisted methods for medical diagnosis and biomedical health monitoring are rapidly shifting from classical invasive methods to handheld-based non-invasive approaches. Biomedical imagining is one of the most prominent practices of non-invasive mechanisms in medical applications. This paper considers the medical imaging schemes for Mobile Health (mHealth) applications and studies the feasibility of future mobile systems for accommodating image informatics capabilities. PMID:24111219

Adibi, Sasan

2013-07-01

296

What Makes Difference in Mobile Application Sales in Countries?  

Microsoft Academic Search

\\u000a Since mobile applications use expended Wi-Fi environments and smart phones user population growth, the market is expanding\\u000a rapidly. These mobile applications are supplied to the same standards around the world, but the applications preference is\\u000a different for each user. Because user can choose applications based their own cultural and technical backgrounds on. Download\\u000a a large number of applications is assumed

Hyeyoung Eun; Hyunsuk Kim; Sungmin Hong

297

Probing the mobility of membrane proteins inside the cell  

Microsoft Academic Search

Studies using a variety of microscopy-based approaches have led to a consensus that most cell-surface proteins are highly mobile and diffuse rapidly within fenced microdomains. Little attention, however, has so far been given to the analysis of the mobility of intracellular membrane proteins because of their comparative inaccessibility. Recent advances in microinjection, confocal microscopy and the construction of epitope-tagged proteins

Brian Storrie; Thomas E. Kreis

1996-01-01

298

EVALUATING MOBILE TEXT ENTRY WITH THE FASTAP™ KEYPAD  

Microsoft Academic Search

This paper describes the evaluation of a new keyboard interface for mobile devices. The Fastap™ keypad is designed to allow one character per key-press input on mobile devices without requiring additional hardware (such as a plug-in keyboard) or a stylus-based input display. Results of the evaluation show that Fastap is both efficient and rapidly learnable when compared with the current

Andy Cockburn; Amal Siresena

299

Mobility in Semiconducting Carbon Nanotubes at Finite Carrier Density  

Microsoft Academic Search

Carbon nanotube field-effect transistors operate over a wide range of electron or hole density, controlled by the gate voltage. Here we calculate the mobility in semiconducting nanotubes as a function of carrier density and electric field, for different tube diameters and temperature. The low-field mobility is a non-monotonic function of carrier density, and varies by as much as a factor

Vasili Perebeinos; J. Tersoff; Phaedon Avouris

2006-01-01

300

Addressing Mobile Phone Diversity in Ubicomp Experience Development  

Microsoft Academic Search

Mobile phones are a widely-available class of device with supporting communications infrastructure which can be appropriated\\u000a and exploited to support ubicomp experiences. However mobile phones vary hugely in their capabilities. We explore how a single\\u000a dimension of phone application type embodies the critical trade-off between capability and availability, i.e. between what can be done and the fraction of potential\\u000a participants’

Chris Greenhalgh; Steve Benford; Adam Drozd; Martin Flintham; Alastair Hampshire; Leif Oppermann; Keir Smith; Christoph Von Tycowicz

2007-01-01

301

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

302

Preserving mobility in older adults.  

PubMed Central

Age-related loss of strength contributes to impaired mobility and increases the risk of falls. Recent research has focused on 2 approaches to preventing age-related loss of strength--promoting physical activity and exercise (especially strength training) and using trophic factors to enhance muscle performance. Epidemiologic evidence strongly supports a role of regular physical activity in successful aging by preserving muscle performance, promoting mobility, and reducing fall risk. Randomized controlled trials provide convincing evidence that strength and endurance training improve muscle performance in older adults. Evidence is rapidly accumulating from randomized trials that endurance, strength, and balance training promote mobility and reduce fall risk, though exercise effects differ according to the type of exercise, details of the exercise program, and the target group of older adults. Because lifetime regular physical activity is recommended for all older adults, a reasonable strategy (especially for weak adults) is an activity program that includes strength training. In contrast, insufficient evidence exists to recommend the long-term use of trophic factors to preserve muscular performance. An intervention that merits additional study is avoiding the use of psychoactive drugs because drugs like benzodiazepines appear to be risk factors for inactivity and may have unrecognized direct effects on muscular performance. Because chronic illness is a risk factor for inactivity and disuse muscle atrophy, randomized trials comparing strength training with other interventions would be useful in understanding whether strength training has advantages in preserving muscle performance and improving health-related quality of life in a variety of chronic illnesses such as depressive illness.

Buchner, D M

1997-01-01

303

Identification of decomposable time-varying parameters by means of gradient algorithms  

Microsoft Academic Search

This paper investigates the identification of a class of rapidly varying parameters, bk (n ?? 1 vector), by means of sequential identification algorithms. These algorithms are heuristic extensions of relatively well known, constant-parameter, identification algorithms to the time-varying parameter situation. It is assumed that bk = P(k)??k where P(k) is an n ?? n invertible information matrix whose elements are

J. M. Mendel; McDonnell Douglas Astronautics

1970-01-01

304

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

305

Compressed sensing of time-varying signals  

Microsoft Academic Search

Compressed sensing (CS) lowers the number of measurements required for reconstruction and estimation of signals that are sparse when expanded over a proper basis. Traditional CS approaches deal with time-invariant sparse signals, meaning that, during the measurement process, the signal of interest does not exhibit variations. However, many signals encountered in practice are varying with time as the observation window

D. Angelosante; G. B. Giannakis; E. Grossi

2009-01-01

306

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

307

Cosmology with Time-Varying G  

Microsoft Academic Search

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

Antonio Alfonso-Faus

1986-01-01

308

Induction Heating of a Varying Diameter Preform.  

National Technical Information Service (NTIS)

A proposal to use a varying diameter preform for forging the 120-mm M256 gun tube required a modification to the induction heating system power control to provide uniform heating of the preform. In addition, there was a need to automate the heating proces...

D. Concordia

1992-01-01

309

Lymphoma Risk Varies for Celiac Disease Patients  

MedlinePLUS

... page, please enable JavaScript. Lymphoma Risk Varies for Celiac Disease Patients Blood cancer more common for those with ... Preidt Monday, August 5, 2013 Related MedlinePlus Pages Celiac Disease Diets Lymphoma MONDAY, Aug. 5 (HealthDay News) -- Celiac ...

310

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

311

Hydrodynamics of tubes of varying cross section  

Microsoft Academic Search

A method is suggested of reducing the hydrodynamic resistance by replacing circular cylindrical tubes (CT) by socalled asymmetrical wavy tubes of varying cross section with long exist cone and short nozzle portions. Mathematical simulation of laminar motion of an incompressible fluid (the Navier-Stokes equations) has shown that a change in geometric parameters can change the resistance substantially, making it larger

I. L. Povkh; N. V. Finoshin

1992-01-01

312

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

ERIC Educational Resources Information Center

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

Hall, Judy E.; Lunt, Ingrid

2005-01-01

313

Voltage sweep ion mobility spectrometry.  

PubMed

Ion mobility spectrometry (IMS) is a rapid, gas-phase separation technique that exhibits excellent separation of ions as a standalone instrument. However, IMS cannot achieve optimal separation power with both small and large ions simultaneously. Similar to the general elution problem in chromatography, fast ions are well resolved using a low electric field (50-150 V/cm), whereas slow drifting molecules are best separated using a higher electric field (250-500 V/cm). While using a low electric field, IMS systems tend to suffer from low ion transmission and low signal-to-noise ratios. Through the use a novel voltage algorithm, some of these effects can be alleviated. The electric field was swept from low to high while monitoring a specific drift time, and the resulting data were processed to create a 'voltage-sweep' spectrum. If an optimal drift time is calculated for each voltage and scanned simultaneously, a spectrum may be obtained with optimal separation throughout the mobility range. This increased the resolving power up to the theoretical maximum for every peak in the spectrum and extended the peak capacity of the IMS system, while maintaining accurate drift time measurements. These advantages may be extended to any IMS, requiring only a change in software. PMID:21254780

Davis, Eric J; Williams, Michael D; Siems, William F; Hill, Herbert H

2011-01-21

314

Final report, Ames Mobile Laboratory Project: The development and operation of instrumentation in a mobile laboratory for in situ, real-time screening and characterization of soils using the laser ablation sampling technique  

Microsoft Academic Search

The main focus of the Ames Laboratory`s Technology Integration Program, TIP, from May 1991 through December 1994 was the development, fabrication, and demonstration of a mobile instrumentation laboratory incorporating rapid in situ sampling systems for safe, rapid, and cost effective soil screening\\/characterization. The Mobile Demonstration Laboratory for Environmental Screening Technologies, MDLEST, containing the analysis instrumentation, along with surface and subsurface

M. S. Anderson; S. D. Braymen

1995-01-01

315

A Study ofB ehavioral Intention for 3G Mobile Internet Technology: Preliminary Research on Mobile Learning  

Microsoft Academic Search

Abstract Nowadays,education tendsto go out of the campus. The rapid growth,of mobile users will push educational,institutions to adopt mobile learning solutions. The IT and telecommunication industries ,need to understand,what,factors will influence the users’ intention to adopt ,m-learning technology to support their implementation. InThailand, there is lack of studies investigating the users’ intention to adopt this new technology, particularly focused on

Dulyalak Phuangthong; Settapong Malisawan

316

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.

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

2013-01-01

317

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

318

Probabilistic Tangent Subspace Method for M-QAM Signal Equalization in Time-Varying Multipath Channels  

Microsoft Academic Search

\\u000a A new machine learning method called probabilistic tangent subspace is introduced to improve the performance of the equalization\\u000a for the M-QAM modulation signals in wireless communication systems. Due to the mobility of communicator, wireless communication\\u000a channels are time variant. The uncertainties in the time-varying channel’s coefficients cause the amplitude distortion as\\u000a well as the phase distortion of the M-QAM modulation

Jing Yang; Yunpeng Xu; Hongxing Zou

2005-01-01

319

Rapid shallow breathing  

MedlinePLUS

Tachypnea; Breathing - rapid and shallow; Fast shallow breathing; Respiratory rate - rapid and shallow ... your oxygen level is too low and nebulized respiratory treatments if you are having an asthma attack.

320

Rapid Reading, Yes  

ERIC Educational Resources Information Center

Recommends instruction in rapid reading fo high school and college students and asserts that flexibility of speed and reasoning provide the foundation for effective rapid reading. Describes the components of rapid reading as orientation, selection, clarification, arrangement, review, and study. (RW)

Frommer, Harvey

1971-01-01

321

Strep Test: Rapid  

MedlinePLUS

... some cases, the doctor may do a throat culture instead of a rapid strep test. A throat culture is more accurate than a rapid strep test, ... second swab can be sent for a throat culture if the rapid strep test results are negative. ...

322

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

323

Mobile music touch: mobile tactile stimulation for passive learning  

Microsoft Academic Search

Mobile Music Touch (MMT) helps teach users to play piano melodies while they perform other tasks. MMT is a lightweight, wireless haptic music instruction system consisting of fingerless gloves and a mobile Bluetooth enabled computing device, such as a mobile phone. Passages to be learned are loaded into the mobile phone and are played repeatedly while the user performs other

Kevin Huang; Thad Starner; Ellen Do; Gil Weinberg; Daniel Kohlsdorf; Claas Ahlrichs; Ruediger Leibrandt

2010-01-01

324

Mobility identification and clustering in sparse mobile networks  

Microsoft Academic Search

Non-uniform distributions of mobile nodes are the norm for a mobile network. Often, there can be concentration areas or grouping of nodes. Early work has explored these features to help message disseminations. However, a mobile network application can generate complex mixing mobility patterns that render these work less effective and efficient. In addition, many applications run with in a sparse

Bo Gu; Xiaoyan Hong

2009-01-01

325

User mobility and channel holding time in mobile communications  

Microsoft Academic Search

An important parameter in the analysis of a communication system is the channel holding time of a call. In a mobile communication system, the cell channel holding time may be different than the call duration due to the mobility of the user. To study this impact of the user mobility, a new and general mobility model is presented and analyzed.

Harry Heffes; Kevin M. Ryan

1997-01-01

326

A Simple Varying-alpha Cosmology  

Microsoft Academic Search

We investigate the cosmological consequences of a simple theory in which the\\u000aelectric charge $e$ is allowed to vary. The theory is locally gauge and Lorentz\\u000ainvariant, and satisfies general covariance. We find that in this theory the\\u000afine structure 'constant', $\\\\alpha $, remains almost constant in the radiation\\u000aera, undergoes small increase in the matter era, but approaches a

John D. Barrow; Joao Magueijo

2001-01-01

327

Cosmology with time-varying G  

Microsoft Academic Search

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

Antonio Alfonso-Faus

1986-01-01

328

Service-interruption costs vary widely  

SciTech Connect

The costs of interruptions in electricity service by class of customer on a worldwide basis is examined, as well as factors relating to these costs. Residential capacity-related outage costs vary from 5 cents/kWh to $1.50/kWh; energy-shortfall outage costs between zero and 50 cents/kWh. Industrial capacity-related costs are typically $1 to $7/kWh; energy-shortfall costs between 5 cents and $1/kWh.

Sanghvi, A.P.

1982-09-01

329

Dark energy from mass varying neutrinos  

NASA Astrophysics Data System (ADS)

We show that mass varying neutrinos (MaVaNs) can behave as a negative pressure fluid which could be the origin of the cosmic acceleration. We derive a model independent relation between the neutrino mass and the equation of state parameter of the neutrino dark energy, which is applicable for general theories of mass varying particles. The neutrino mass depends on the local neutrino density and the observed neutrino mass can exceed the cosmological bound on a constant neutrino mass. We discuss microscopic realizations of the MaVaN acceleration scenario, which involve a sterile neutrino. We consider naturalness constraints for mass varying particles, and find that both eV cut-offs and eV mass particles are needed to avoid fine-tuning. In microscopic realizations of this scenario with a sterile neutrino, these considerations give the sterile neutrino a maximum mass today of order an eV, which could be detectable at MiniBooNE. Because the sterile neutrino was much heavier at earlier times, constraints from big bang nucleosynthesis on additional states are not problematic. We consider regions of high neutrino density and find that the most likely place today to find neutrino masses which are significantly different from the neutrino masses in our solar system is in a supernova. The possibility of different neutrino mass in different regions of the galaxy and the local group could be significant for Z-burst models of ultra-high energy cosmic rays. We also consider the cosmology of and the constraints on the 'acceleron', the scalar field which is responsible for the varying neutrino mass, and briefly discuss neutrino density dependent variations in other constants, such as the fine structure constant.

Fardon, Rob; Nelson, Ann E.; Weiner, Neal

2004-10-01

330

Long wave interaction over varying topography  

Microsoft Academic Search

The propagation of long waves on the surface of a three-dimensional fluid domain bounded below by slowly varying topography is considered. There are two important limits: If the initial data can be written in terms of a discrete set of one-dimensional wavefronts, the resulting wave field is described by a set of variable coefficient Korteweg-de Vries (KdV) equations for each

P. Milewski

1998-01-01

331

Elliptical varied line-space (EVLS) gratings  

NASA Astrophysics Data System (ADS)

Imaging spectroscopy at wavelengths below 2000 Å offers an especially powerful method for studying many extended high-temperature astronomical objects, like the Sun and its outer layers. But the technology to make such measurements is also especially challenging, because of the poor reflectance of all standard materials at these wavelengths, and because the observation must be made from above the absorbing effects of the Earth's atmosphere. To solve these problems, single-reflection stigmatic spectrographs for XUV wavelengths have bee flown on several space missions based on designs with toroidal uniform line-space (TULS) or spherical varied line-space (SVLS) gratings that operate at near normal-incidence. More recently, three solar EUV/UV instruments have been selected that use toroidal varied line-space (TVLS) gratings; these are SUMI and RAISE, both sounding rocket payloads, and NEXUS, a SMEX satellite-mission. The next logical extension to such designs is the use of elliptical surfaces for varied line-space (EVLS) rulings. In fact, EVLS designs are found to provide superior imaging even at very large spectrograph magnifications and beam-speeds, permitting extremely high-quality performance in remarkably compact instrument packages. In some cases, such designs may be optimized even further by using a hyperbolic surface for the feeding telescope. The optical characteristics of two solar EUV spectrometers based on these concepts are described: EUS and EUI, both being developed as possible instruments for ESA's Solar Orbiter mission by consortia led by RAL and by MSSL, respectively.

Thomas, Roger J.

2004-10-01

332

Adaptive, template moderated, spatially varying statistical classification.  

PubMed

A novel image segmentation algorithm was developed to allow the automatic segmentation of both normal and abnormal anatomy from medical images. The new algorithm is a form of spatially varying statistical classification, in which an explicit anatomical template is used to moderate the segmentation obtained by statistical classification. The algorithm consists of an iterated sequence of spatially varying classification and nonlinear registration, which forms an adaptive, template moderated (ATM), spatially varying statistical classification (SVC). Classification methods and nonlinear registration methods are often complementary, both in the tasks where they succeed and in the tasks where they fail. By integrating these approaches the new algorithm avoids many of the disadvantages of each approach alone while exploiting the combination. The ATM SVC algorithm was applied to several segmentation problems, involving different image contrast mechanisms and different locations in the body. Segmentation and validation experiments were carried out for problems involving the quantification of normal anatomy (MRI of brains of neonates) and pathology of various types (MRI of patients with multiple sclerosis, MRI of patients with brain tumors, MRI of patients with damaged knee cartilage). In each case, the ATM SVC algorithm provided a better segmentation than statistical classification or elastic matching alone. PMID:10972320

Warfield, S K; Kaus, M; Jolesz, F A; Kikinis, R

2000-03-01

333

Understanding Mobile Apps  

MedlinePLUS

... including some with free versions. Mobile App User Reviews Can I trust all the user reviews I read about an app? Most app stores include user reviews that can help you decide whether to download. ...

334

Mobile Library Filming Device.  

National Technical Information Service (NTIS)

The work reported is the result of the design, fabrication, and testing of a Mobile Library Filming Device, consisting of a camera and self-contained power source. The document contains the study, performance test, conclusions, and manufacturer's design, ...

C. E. Martin

1968-01-01

335

Persuasive Mobile Health Applications  

NASA Astrophysics Data System (ADS)

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

Garcia Wylie, Carlos; Coulton, Paul

336

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.

337

REST based mobile applications  

NASA Astrophysics Data System (ADS)

Simplicity is the major advantage of REST based webservices. Whereas SOAP is widespread in complex, security sensitive business-to-business aplications, REST is widely used for mashups and end-user centric applicatons. In that context we give an overview of REST and compare it to SOAP. Furthermore we apply the GeoDrawing application as an example for REST based mobile applications and emphasize on pros and cons for the use of REST in mobile application scenarios.

Rambow, Mark; Preuss, Thomas; Berdux, Jörg; Conrad, Marc

2008-03-01

338

Autonomous Mobile Networks  

Microsoft Academic Search

Summary form only given, as follows. Autonomous mobile networks are distributed ad-hoc networks of nodes that can sense, actuate, compute and communicate with each other using point-to-point multi-hop communication. The nodes in such networks include static sensors, mobile sensors, robots, and humans. Such systems combine the most advanced concepts in perception, communication and control to create computational systems capable of

Daniela Rus

2004-01-01

339

Using Mobile Phones in Education  

Microsoft Academic Search

We present three projects in mobile learning. First, we polled 333 Japanese university students regarding their use of mobile devices. 100% reported owning a mobile phone. 99% send email on their mobile phones, exchanging some 200 email messages each week. 66% email peers about classes; 44% email for studying. In contrast, only 43% email on PCs, exchanging an average of

Patricia Thornton; Chris Houser

2004-01-01

340

Student Acceptance of Mobile Learning  

Microsoft Academic Search

Mobile devices with Internet capabilities and applications have dramatically increased the convenience of accessing information for community college students. This study uses technology acceptance theory as a theoretical framework to examine the determinants associated with community college students’ behavioral intention to use of mobile learning and mobile library resources. The acceptance of mobile learning by students and educators is critical

Robin Lee Donaldson

2011-01-01

341

Mobile video stream monitoring system  

Microsoft Academic Search

IMVS (Intelligent Mobile Video Stream Monitoring System) is a mobile video surveillance system. The objective of IMVS is to design a high performance video stream monitoring system in a mobile computing environment. In particular, the technical questions to be addressed are: (1) how to minimize the amount of video signals to be transmitted between the front-end mobile device and the

Kam-Yiu Lam; Calvin K. H. Chiu

2003-01-01

342

Users' perception of mobile payment  

Microsoft Academic Search

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

Steinar Kristoffersen; Anders Synstad; Kristian Sorli

2008-01-01

343

Libraries and the Mobile Web  

ERIC Educational Resources Information Center

|In 2011, cell phones and mobile devices are ubiquitous. The vast majority of Americans now own cell phones, and over half of them have mobile access to the Internet through a phone or other mobile device. For libraries to stay relevant, they must be able to offer content and services through the mobile web. In this issue of "Library Technology…

Hanson, Cody

2011-01-01

344

Internet Mobility 4x4  

Microsoft Academic Search

Mobile IP protocols allow mobile hosts to send and receive packets addressed with their home network IP address, regardless of the IP address of their current point of attachment in the Internet.While some recent work in Mobile IP focuses on a couple of specific routing optimizations for sending packets to and from mobile hosts [Joh96] [Mon96], we show that a

Stuart Cheshire; Mary Baker

1996-01-01

345

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

346

Thin film deposition with time-varying temperature  

NASA Astrophysics Data System (ADS)

We study the effects of time-dependent substrate/film temperature in the deposition of a mesoscopically thick film using a statistical model that accounts for diffusion of adatoms without lateral neighbors whose coefficients depend on an activation energy and temperature. Dynamic scaling with fixed temperature is extended to predict conditions in which the temperature variation significantly affects surface roughness scaling. It agrees with computer simulation results for deposition of up to 104 atomic layers and maximal temperature changes of 30 K, near or below room temperature. If the temperature decreases during the growth, the global roughness may have a rapid growth, with effective exponents larger than 1/2 due to the time-decreasing adatom mobility. The local roughness in small box size shows typical evidence of anomalous scaling, with anomaly exponents depending on the particular form of temperature decrease. If the temperature increases during the growth, a non-monotonic evolution of the global roughness may be observed, which is explained by the competition of kinetic roughening and the smoothing effect of increasing diffusion lengths. The extension of the theoretical approach to film deposition with other activation energy barriers shows that similar conditions on temperature variation may lead to the same morphological features. Equivalent results may also be observed by controlling the deposition flux.

de Assis, T. A.; Aarão Reis, F. D. A.

2013-10-01

347

Conformation dependence of DNA electrophoretic mobility in a converging channel.  

PubMed

The electrophoresis of lambda-DNA is observed in a microscale converging channel where the center-of-masses trajectories of DNA molecules are tracked to measure instantaneous electrophoretic (EP) mobilities of DNA molecules of various stretch lengths and conformations. Contrary to the usual assumption that DNA mobility is a constant, independent of field and DNA length in free solution, we find DNA EP mobility varies along the axis in the contracting geometry. We correlate this mobility variation with the local stretch and conformational changes of the DNA, which are induced by the electric field gradient produced by the contraction. A "shish-kebab" model of a rigid polymer segment is developed, which consists of aligned spheres acting as charge and drag centers. The EP mobility of the shish-kebab is obtained by determining the electrohydrodynamic interactions of aligned spheres driven by the electric field. Multiple shish-kebabs are then connected end-to-end to form a freely jointed chain model for a flexible DNA chain. DNA EP mobility is finally obtained as an ensemble average over the shish-kebab orientations that are biased to match the overall stretch of the DNA chain. Using physically reasonable parameters, the model agrees well with experimental results for the dependence of EP mobility on stretch and conformation. We find that the magnitude of the EP mobility increases with DNA stretch, and that this increase is more pronounced for folded conformations. PMID:20737448

Liao, Wei-Ching; Watari, Nobuhiko; Wang, Shengnian; Hu, Xin; Larson, Ronald G; Lee, Ly James

2010-08-01

348

Kuramoto model with time-varying parameters  

NASA Astrophysics Data System (ADS)

We analyze the Kuramoto model generalized by explicit consideration of deterministically time-varying parameters. The oscillators' natural frequencies and/or couplings are influenced by external forces with constant or distributed strengths. A dynamics of the collective rhythms is observed, consisting of the external system superimposed on the autonomous one, a characteristic feature of many thermodynamically open systems. This deterministic, stable, continuously time-dependent, collective behavior is fully described, and the external impact to the original system is defined in both the adiabatic and the nonadiabatic limits.

Petkoski, Spase; Stefanovska, Aneta

2012-10-01

349

Laser lithotripsy retropulsion varies with stone mass  

NASA Astrophysics Data System (ADS)

OBJECTIVES: We tested the hypothesis that retropulsion varies with stone size. METHODS: Stone phantoms of uniform cube dimensions were constructed and irradiated with Ho:YAG energy (0.5 J - 3.5 J). Displacement was measured. RESULTS: At any given pulse energy, retropulsion decreased as stone size increased, p<0.05. At any given stone size, retropulsion increased as pulse energy increased, p<0.05. CONCLUSIONS: A strategy of low pulse energy at high repetition rate is appropriate for ureteral stones. For larger bladder and renal stones, retropulsion is minimal even with high pulse energies. More study is warranted.

Robinson, Michael E.; Teichman, Joel M. H.

350

Peptide mobility and peptide mapping in capillary zone electrophoresis  

Microsoft Academic Search

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

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

1999-01-01

351

Climate Dynamics: Why Does Climate Vary?  

NASA Astrophysics Data System (ADS)

Climate Dynamics: Why Does Climate Vary? presents the major climate phenomena within the climate system to underscore the potency of dynamics in giving rise to climate change and variability. These phenomena include deep convection over the Indo-Pacific warm pool and its planetary-scale organization: the Madden-Julian Oscillation, the monsoons, the El Niño-Southern Oscillation, the Pacific Decadal Oscillation, and the low-frequency variability of extratropical circulations. The volume also has a chapter focusing on the discussion of the causes of the recent melting of Arctic sea ice and a chapter devoted to the discussion of the causes of recent changes in the frequency and intensity of tropical cyclones. On each topic, the basic material of climate dynamics is covered to aid the understanding of the forefront research, making the volume accessible to a broad spectrum of readers. The volume highlights include • Diabatic and nonlinear aspects of the El Niño-Southern Oscillation • Causes of sea ice melting in the Arctic • Impact of global warming on tropical cyclone activity • Origins of the Pacific Decadal Oscillation • Causes of climate variability of Asian monsoons The volume will be of particular interest to graduate students and young researchers in atmospheric and oceanic sciences and related disciplines such as geology and geography. The book will also be a good read for those who have a more general interest in the Earth's climate and why it varies.

Sun, De-Zheng; Bryan, Frank

352

Stereoscopic depth perception varies with hues  

NASA Astrophysics Data System (ADS)

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

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

2012-09-01

353

Controlling Contagion Processes in Time Varying Networks  

NASA Astrophysics Data System (ADS)

The vast majority of strategies aimed at controlling contagion and spreading processes on networks consider the connectivity pattern of the system as quenched. In this paper, we consider the class of activity driven networks to analytically evaluate how different control strategies perform in time-varying networks. We consider the limit in which the evolution of the structure of the network and the spreading process are simultaneous yet independent. We analyze three control strategies based on node's activity patterns to decide the removal/immunization of nodes. We find that targeted strategies aimed at the removal of active nodes outperform by orders of magnitude the widely used random strategies. In time-varying networks however any finite time observation of the network dynamics provides only incomplete information on the nodes' activity and does not allow the precise ranking of the most active nodes as needed to implement targeted strategies. Here we develop a control strategy that focuses on targeting the egocentric time-aggregated network of a small control group of nodes.The presented strategy allows the control of spreading processes by removing a fraction of nodes much smaller than the random strategy while at the same time limiting the observation time on the system.

Liu, Suyu; Perra, Nicola; Karsai, Marton; Vespignani, Alessandro

2013-03-01

354

Quantum-critical Pairing with Varying Exponents  

NASA Astrophysics Data System (ADS)

We analyze the onset temperature T p for the pairing in cuprate superconductors at small doping, when tendency towards antiferromagnetism is strong. We consider the model of Moon and Sachdev (MS), which assumes that electron and hole pockets survive in a paramagnetic phase. Within this model, the pairing between fermions is mediated by a gauge boson, whose propagator remains massless in a paramagnet. We relate the MS model to a generic ?-model of quantum-critical pairing with the pairing kernel ?(?n)?1/?^{?}n. We show that, over some range of parameters, the MS model is equivalent to ?=1/3-model ( ?(?)??-1/3). We find, however, that the parameter range where this analogy works is bounded on both ends. At larger deviations from a magnetic phase, the MS model becomes equivalent to ? model with varying ?>1/3, whose value depends on the distance to a magnetic transition and approaches ?=1 deep in a paramagnetic phase. Very near the transition, the MS model becomes equivalent to ? model with varying ?<1/3. Right at the magnetic QCP, the MS model is equivalent to the model with ?(? n )?log ? n , which is the model for color superconductivity. Using this analogy, we verify the formula for T c derived for color superconductivity.

Moon, Eun-Gook; Chubukov, Andrey

2010-10-01

355

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

356

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

357

Best ways to use billions of devices on a wireless mobile SoC  

Microsoft Academic Search

A rapid growth in the field of Information Technologies (IT) over the last decade gave us unimaginable possibilities and lots of convenience in our life, i.e. highspeed Internet, mobile-TV, High-definition digital TV, 3D-gaming, mobile multimedia player, Ultra-Mobile PC and so on. Nowadays, the technology is even exceeding market demands. Apple produced 160GB iPod which stores 40,000 songs. Samsung showed a

Kyungho Kim

2008-01-01

358

The Model and Trait of the 4G Self-Organization Mobile Business Network  

Microsoft Academic Search

Mobile business is a promising industry created by the emergence of wireless date networks. The users could use mobile terminals to transmit data and conduct business activities. The 4G self-organization mobile business network is a sort of business network in which the clients and the services or goods providers, both of whom move freely, could organize a self-organized network rapidly

Wu Di; Guo Hongyan

2009-01-01

359

A conceptual model of public medical service system based-on cell phone mobile platform  

Microsoft Academic Search

\\u000a In recent years, cell phones have played an increasingly important role in rapidly-developing global telecommunication services.\\u000a At present, mobile business develops very fast. However, the development in other mobile service fields, such as public service,\\u000a mobile medical service, etc, is still in its infant stage. Drawing on the experience of the ‘doctor workstation project’ which\\u000a is cooperated by Renmin University

Hongjiao Fu; Yue Zhao

2007-01-01

360

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

Microsoft Academic Search

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

D. Siewiorek

2001-01-01

361

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

362

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

363

Mobile Me, Mobile Library Services: CUHK's Perspectives  

Microsoft Academic Search

Many different kinds of researches, teaching and learning activities are taking place in The Chinese University of Hong Kong (CUHK). Traditional classroom-based teaching cannot fully cope with the rapid increasing number of staff and students not to mention their expectations. On the other hand, learning activities via WebCT and Moodle, emails, online forums and other means of Internet applications are

Kevin Leung; Ivan Chan

2012-01-01

364

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

365

Time Optimal Path Planning on Outdoor Terrain for Mobile Robots under Dynamic Constraints  

Microsoft Academic Search

ó We present a mobile robot planner that nds an approximately minimum time path between two cong- urations on uneven outdoor terrain. The computed path is smooth, safe, and satises dynamic constraints. The terrain is modeled as a geometric surface. The robot is a Segway Robotic Mobile Platform (RMP) - a dynamically stabilized two-wheeled platform. The planner uses bidirectional rapidly

Marin Kobilarov; Gaurav S. Sukhatme

366

A virtual agent based mobile 3D game with mascot capsule Micro3D API  

Microsoft Academic Search

The rapid advancement in memory capability and computing power of mobile phones has made them ideal portable platforms for gaming. As the user expectations for the gaming experience grow, mobile games inevitably move from 2 dimensional to 3 dimensional. In this paper, we explore the use of a popular proprietary 3D engine -- Mascot Capsule V3 for Java enabled handsets

Yu Han; Ding Ling; Lu Xin; Xie Boya

2006-01-01

367

Risk and Benefit Perceptions of Mobile Phone and Base Station Technology in Bangladesh  

Microsoft Academic Search

Research in developed countries showed that many citizens perceive that radio signals transmitted by mobile phones and base stations represent potential health risks. Less research has been conducted in developing countries focused on citizen perceptions of risks and benefits, despite the recent and rapid introduction of mobile communication technologies. This study aims to identify factors that are influential in determining

Kleef van E; A. R. H. Fischer; M. Khan; L. J. Frewer

2010-01-01

368

Design of base station antenna using ACP technology for mobile communication  

Microsoft Academic Search

Mobile communication is in ever expanding demand. To cater for the rapid increase in the number of users, the overall capacity of the service must be increased. A very important component of any mobile communication system is the base station antenna. In this work, a single element patch antenna was designed using the ACP technique, operating at 1.8 GHz, which

A. Sherwal; N. Tran

2001-01-01

369

Analysis of propagation path for location of base-station in the microcell CDMA mobile communications  

Microsoft Academic Search

In microcell mobile communication, we analyze the propagation path which can accurately and rapidly interpret mobile communication propagation in an urban environment, when the subscriber service is based on the urban main road. To find the appropriate BS location in an urban street, we suggest a simplified algorithm to interpret the propagation path and a propagation prediction model which can

Sun-Kuk Noh; Chang-Gyun Park

2004-01-01

370

Proposing an enhanced mobile ad hoc network framework to the open source simulator NS2  

Microsoft Academic Search

Mobile ad hoc network (MANET) is a collection of autonomous nodes or terminals that communicate with each other by forming a multihop radio network. These nodes maintain connectivity in a decentralized manner. MANET is characterized by a rapidly changing topology. Nowadays, simulation is the research tool of the mobile ad hoc network (MANET) community. NS2 is one of the most

Ahmad Jabas; Rama M. Garimella; S. Ramachandram

2008-01-01

371

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

372

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

Microsoft Academic Search

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

Markus Schüring; Georgios Karagiannis

2011-01-01

373

3G Mobile Phone Usage in China: Viewpoint from Innovation Diffusion Theory and Technology Acceptance Model  

Microsoft Academic Search

The rapid development of wireless communication technology along with the increasing usage of the Internet has promoted mobile business as well as significant increase in consumers. Third generation (3G) mobile phone becomes more and more popular in many countries. However, the development and popularity of 3G in China was hampered. To answer it, this paper analyzed the reasons behind through

Zhenghao Zhu; M. T. Liu; M. Pang Chuan

2009-01-01

374

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

375

Using Methods of Association Rules Mining Optimizationin in Web-Based Mobile-Learning System  

Microsoft Academic Search

With the rapid development of Internet and Mobile technologies, Web-based Mobile-Learning System has created new ways for educators to communicate with learners. Association rule mining is one of the most important fields in data mining and knowledge discovery in databases. Rules explosion is a serious problem which causes great concerned, as conventional mining algorithms often produce too many rules for

Shijue Zheng; Shaojun Xiong; Yin Huang; Shixiao Wu

2008-01-01

376

Geolearners: Location-Based Informal Learning with Mobile and Social Technologies  

Microsoft Academic Search

This paper looks at how mobile and social technologies are influencing informal learning in the context of online community membership. The development of mobile technologies that use Global Positioning System (GPS) data to pinpoint geographical location together with the rapidly evolving Web 2.0 technologies supporting the creation and consumption of content suggest a potential for collaborative informal learning linked to

Gill Clough

2010-01-01

377

Performance characterization and optimization of mobile augmented reality on handheld platforms  

Microsoft Academic Search

The introduction of low power general purpose processors (like the Intel® Atom™ processor) expands the capability of handheld and mobile internet devices (MIDs) to include compelling visual computing applications. One rapidly emerging visual computing usage model is known as mobile augmented reality (MAR). In the MAR usage model, the user is able to point the handheld camera to an object

Sadagopan Srinivasan; Zhen Fang; Ravi Iyer; Steven Zhang; Mike Espig; Don Newell; Daniel Cermak; Yi Wu; Igor Kozintsev; Horst W. Haussecker

2009-01-01

378

Ion mobility based on column leaching of South African gold tailings dam with chemometric evaluation  

Microsoft Academic Search

New column leaching experiments were designed and used as an alternative rapid screening approach to element mobility assessment. In these experiments, field-moist material was treated with an extracting solution to assess the effects of acidification on element mobility in mine tailings. The main advantage of this version of column leaching experiments with partitioned segments is that they give quick information

Ewa M Cukrowska; Koovila Govender; Morris Viljoen

2004-01-01

379

Driver personality characteristics related to self-reported accident involvement and mobile phone use while driving  

Microsoft Academic Search

A causal model was developed in this study to clarify the eVect of mobile phone use on driving safety. Based on the model, a series of questionnaires were developed, and 194 car drivers were inter- viewed based on these questionnaires. Results showed that perceived risk and mobile phone usage habits varied with diVerent individual traits. Drivers who were prone to

Yi-Lang Chen

2006-01-01

380

A foundation for tool based mobility support for visually impaired web users  

Microsoft Academic Search

Users make journeys through the Web. Web travel encompasses the tasks of orientation and navigation, the environment and the purpose of the journey. The ease of travel, its mobility, varies from page to page and site to site. For visually impaired users, in particular, mobility is reduced; the objects that support travel are inaccessible or missing altogether. Web development tools

Yeliz Yesilada; Robert Stevens; Carole A. Goble

2003-01-01

381

A stochastic partial transport model for mixed-size sediment: Application to assessment of fractional mobility  

Microsoft Academic Search

In this study we incorporate the existing concept of fractional mobility into a stochastic framework for modeling the partial transport of mixed-size sediment. The model predicts the fractional transport rates with parameters such as the long-run moving probability, mean particle velocity, and fractional mobility, all varying with the dimensionless effective shear stress. Movement of bed load particles is treated as

Fu-Chun Wu; Kuo-Hsin Yang

2004-01-01

382

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...

383

Liver glycogen, glucose mobilization and freezing survival in chorus frogs, Pseudacris triseriata  

Microsoft Academic Search

We compared liver glycogen stores and glucose mobilization during freezing among winters in chorus frogs, Pseudacris triseriata, where populations varied in freezing survival. We also characterized tissue glycogen levels across the annual cycle. Frogs with low liver glycogen stores mobilized low amounts of glucose during freezing, and these were correlated with population variation in freezing survival. Moreover, liver glycogen stores

Jennifer L. Jenkins; David L. Swanson

2005-01-01

384

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

385

A Mobile Tele-Radiology Imaging System with JPEG2000 for an Emergency Care  

Microsoft Academic Search

The aim of this study was to design a tele-radiology imaging system for rapid emergency care via mobile networks and to assess\\u000a the diagnostic feasibility of the Joint Photographic Experts Group 2000 (JPEG2000) radiological imaging using portable devices.\\u000a Rapid patient information and image exchange is helpful to make clinical decisions. We assessed the usefulness of the mobile\\u000a tele-radiology system by

Dong Keun Kim; Eung Y. Kim; Kun H. Yang; Chung Ki Lee; Sun K. Yoo

386

Global mobility for psychologists: the role of psychology organizations in the United States, Canada, Europe, and other regions.  

PubMed

Global mobility for psychologists is rapidly improving because of an emerging consensus on recognition standards, the demand for cross-border mobility both internal and external to the profession, and the efforts of membership, credentialing, and regional organizations to promote mobility. In the United States, multiple credentialing organizations promote mobility, primarily through individual endorsement of credentials. The Canadian regulatory boards signed a mutual recognition agreement implementing fast-track mechanisms for licensed psychologists seeking mobility and a competency-based assessment for initial registration. Europe plans to reduce barriers to mobility through mutual recognition of qualifications via a EuroPsy diploma that provides a benchmark for professional psychology education and training. Other regions have not made as much progress with regard to promoting mobility, as many do not yet even regulate the practice of psychology. The authors examine who seeks mobility, which geographic regions promote mobility, and by which mechanisms. PMID:16221004

Hall, Judy E; Lunt, Ingrid

2005-10-01

387

Phloem Mobility of Xenobiotics  

PubMed Central

Two bioassays were used to test phloem mobility of selected xenobiotic compounds: (a) excised bean leaf assay; (b) rooted bean leaf assay. Compounds assayed were N-alkylpyridiniums with systematic variation in octanol-water partition coefficients (log Kow), substituted benzoic acids with about the same log Kow value but variable acidities. Results of the assays strongly conform, quantitatively, to the predictions of the unified mathematical model. Results also indicate that the membrane permeability value of a compound, which depends directly on log Kow value, is the overriding factor in determining phloem mobility. When the weak acid functionality of a compound confers increased phloem mobility, it does so principally by making the log Kow value, and consequently the membrane permeability of the compound more optimal.

Hsu, Francis C.; Kleier, Daniel A.; Melander, Wayne R.

1988-01-01

388

Mobile VLBI transfer  

NASA Astrophysics Data System (ADS)

The National Aeronautics and Space Administration (NASA) has agreed to transfer Mobile Very Long Baseline Interferometry (VLBI) equipment and operations to the National Oceanic and Atmospheric Administration (NOAA). NOAA will use these mobile systems to create and maintain a National Crustal Motion Network (NCMN) and to support NASA's Crustal Dynamics Project. Consisting of several fixed VLBI sites across the United States, and 40 to 50 additional sites established by mobile VLBI, the NCMN will provide a basic terrestrial coordinate system throughout the United States that has been referenced to the inertial system defined by the fixed VLBI stations. While monitoring crustal deformation across the United States, the NCMN will also establish base stations in the National Networks of Geodetic Control that will also provide accuracy criteria for use with differential and interferometric Global Positioning System receivers. This NCMN will gain further importance as the burden of geodetic observations shifts increasingly to satellite-based techniques in the future.

Mader, Gerald L.

389

Mobility control agents  

SciTech Connect

Enhanced oil recovery (EOR) by means of steam drive, for heavier crudes, and CO/sub 2/ flooding, for lighter, mobilizes oil left behind by more conventional methods and displaces it to producing wells. In higher mobility, fingering, and flow of the drive or flood substance through low permeability paths, reduces the efficiency of EOR. Mobility control agents block these permeable paths. Five tests, two at Santa Fe Energy's Midway-Sunset field, one at Conoco's Cat Canyon, and two at Texaco's San Ardo field, are made to address the excessive channelling of steam through ''theif'' zones, and the progressive increase in steam flow through oil depleted, already swept zones. The success of the tests demonstrates the viability of the process by diverting steam, increasing oil recovery, increasing oil-steam ratio, and improving the water cut.

Hammershaimb, E.C.; KuugKraa, V.A.

1983-06-01

390

Inference of temporally varying Bayesian Networks  

PubMed Central

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

Thorne, Thomas; Stumpf, Michael P. H.

2012-01-01

391

Percolation model with continuously varying exponents  

NASA Astrophysics Data System (ADS)

This work analyzes a percolation model on the diamond hierarchical lattice (DHL), where the percolation transition is retarded by the inclusion of a probability of erasing specific connected structures. It has been inspired by the recent interest on the existence of other universality classes of percolation models. The exact scale invariance and renormalization properties of DHL leads to recurrence maps, from which analytical expressions for the critical exponents and precise numerical results in the limit of very large lattices can be derived. The critical exponents ? and ? of the investigated model vary continuously as the erasing probability changes. An adequate choice of the erasing probability leads to the result ?=?, like in some phase transitions involving vortex formation. The percolation transition is continuous, with ?>0, but ? can be as small as desired. The modified percolation model turns out to be equivalent to the Q?1 limit of a Potts model with specific long range interactions on the same lattice.

Andrade, R. F. S.; Herrmann, H. J.

2013-10-01

392

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

393

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

394

Climate dynamics: Why does climate vary?  

NASA Astrophysics Data System (ADS)

In recent years, climate change has become a major focus of public and political discussion. Ongoing scientific inquiry, revolving predominantly around understanding the anthropogenic effects of rising greenhouse gas levels, coupled with how successfully findings are communicated to the public, has made climate science both contentious and exigent. In the AGU monograph Climate Dynamics: Why Does Climate Vary?, editors De-Zheng Sun and Frank Bryan reinforce the importance of investigating the complex dynamics that underlie the natural variability of the climate system. Understanding this complexity—particularly how the natural variability of climate may enhance or mask anthropogenic warming—could have important consequences for the future. In this interview, Eos talks to De-Zheng Sun.

Schultz, Colin

2011-08-01

395

Fundamental Investigation of Circumferentially Varying Stator Cascades  

NASA Astrophysics Data System (ADS)

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

Farnsworth, John A. N.

396

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

397

Mobility of Plasmids†  

PubMed Central

Summary: Plasmids are key vectors of horizontal gene transfer and essential genetic engineering tools. They code for genes involved in many aspects of microbial biology, including detoxication, virulence, ecological interactions, and antibiotic resistance. While many studies have decorticated the mechanisms of mobility in model plasmids, the identification and characterization of plasmid mobility from genome data are unexplored. By reviewing the available data and literature, we established a computational protocol to identify and classify conjugation and mobilization genetic modules in 1,730 plasmids. This allowed the accurate classification of proteobacterial conjugative or mobilizable systems in a combination of four mating pair formation and six relaxase families. The available evidence suggests that half of the plasmids are nonmobilizable and that half of the remaining plasmids are conjugative. Some conjugative systems are much more abundant than others and preferably associated with some clades or plasmid sizes. Most very large plasmids are nonmobilizable, with evidence of ongoing domestication into secondary chromosomes. The evolution of conjugation elements shows ancient divergence between mobility systems, with relaxases and type IV coupling proteins (T4CPs) often following separate paths from type IV secretion systems. Phylogenetic patterns of mobility proteins are consistent with the phylogeny of the host prokaryotes, suggesting that plasmid mobility is in general circumscribed within large clades. Our survey suggests the existence of unsuspected new relaxases in archaea and new conjugation systems in cyanobacteria and actinobacteria. Few genes, e.g., T4CPs, relaxases, and VirB4, are at the core of plasmid conjugation, and together with accessory genes, they have evolved into specific systems adapted to specific physiological and ecological contexts.

Smillie, Chris; Garcillan-Barcia, M. Pilar; Francia, M. Victoria; Rocha, Eduardo P. C.; de la Cruz, Fernando

2010-01-01

398

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

399

Effect of mobile phone radiation on heart rate variability  

Microsoft Academic Search

The rapid increase in the use of mobile phones (MPs) in recent years has raised the problem of health risk connected with high-frequency electromagnetic fields. There are reports of headache, dizziness, numbness in the thigh, and heaviness in the chest among MP users. This paper deals with the neurological effect of electromagnetic fields radiated from MPs, by studies on heart

V. I. Thajudin Ahamed; N. G. Karthick; Paul K. Joseph

2008-01-01

400

Preschool Orientation and Mobility: A Review of the Literature.  

ERIC Educational Resources Information Center

|A review of literature on orientation and mobility (O&M) training for preschool children with visual impairments finds that these services have expanded rapidly despite lack of a well-documented and thorough research base beyond the demonstrated value of basic O&M instruction in early intervention. The review addresses the need for services,…

Leong, S.

1996-01-01

401

Collectively defining context in a mobile, networked computing environment  

Microsoft Academic Search

Mobile and wireless computers are rapidly becoming popular with the general public. In our research we design and evaluate new types of applications that take advantage of the unique characteristics of these devices in novel ways. One of these applications is Graffiti, a context-aware device designed using ideas from social navigation research. This system allows users to collectively define what's

Jenna Burrell; Geri IC Gay

2001-01-01

402

DEVELOPMENT OF A COMMERCIAL LASER SCANNING MOBILE MAPPING SYSTEM - STREETMAPPER  

Microsoft Academic Search

The performance and availability of modern 3D laser scanning systems has created a demand for a system that can survey many kilometres of highway very rapidly. Airborne laser scanning can offer this type of data but aircraft operations are expensive. Tunnels and bridges can be analysed from the bottom up. The StreetMapper mobile laser scanning system was developed initially to

G. Hunter; C. Cox; J. Kremer

403

Prospective Analysis of the Mobile Health Information Systems in China  

Microsoft Academic Search

With the rapidly growing economy in the past few decades, people of China (mainland) are now enjoying increasingly more economic benefits than ever before. Of many growing technologies, mobile devices, especially cell phones, have been gaining popularity throughout the country. According to the latest statistics in 2007, more than one third of Chinese have cell phones. In addition to the

Xiaoqing Li

2008-01-01

404

Mobility of Native American Students Can Pose Challenges to Achievement  

ERIC Educational Resources Information Center

This article reports on an obstacle to achievement that seems particularly pronounced among Native American students high mobility. The turnover rate for one school, North Middle School in Rapid City, South Dakota, was 50 percent overall last year--meaning that half the school's 468 students came or went after the start of the school year. Many of…

Zehr, Mary Ann

2007-01-01

405

Critical Success Factors for Accelerating Mobile Commerce Diffusion in Europe  

Microsoft Academic Search

The rapid evolution of B2C e-Commerce alternative interaction channels (i.e., World Wide Web, Mobile Telephony and Digital TV) along with the continuously changing consumer behavioural patterns, has created a strong need for research tailored to the peculiarities and needs of the aforementioned emerging \\

Adam P. Vrechopoulos; Ioanna D. Constantiou; Nikos Mylonopoulos

406

IMS-MBMS Convergence for Next Generation Mobile Networks  

Microsoft Academic Search

Mobile and wireless communication standards and technologies have witnessed rapid enhancements in the last few years. Dynamic, interactive, rich content and location based services such as IPTV, multimedia conferencing, buddy lists and presence have emerged. However, multimedia services often prove to be heavy on radio resources and multicast or broadcast is a resource efficient transmission mode. Currently, IMS only supports

A. Ikram; M. Zafar; N. Baker; R. Chiang

2007-01-01

407

Opportunistic detection of relative mobility in wireless sensor networks  

Microsoft Academic Search

In highly mobile ad hoc networks the neighbourhood status evolves rapidly. Routing tables which are populated with an “out of date” view of the neighbourhood produce an overhead in the routing process which can affect the QoS of the communication and the stability of the network interconnectivity. To maintain correct network state information, periodic “Hello” messages are often employed. In

Ricardo Simon Carbajo; Meriel Huggard; Ciarán Mc Goldrick

2010-01-01

408

Estimating network effects in mobile telephony in Germany  

Microsoft Academic Search

In this paper we analyze demand for mobile telecommunications services in Germany in the period from January 1998 to June 2003. During this time, there was an explosive growth in the subscriber base by about 700% and a rather moderate decrease in prices by about 41%. Our conjecture is, that prices alone cannot account for such rapid diffusion. We estimate

Toker Doganoglu; Lukasz Grzybowski

2007-01-01

409

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

410

GIS INTEGRATION OF DATA COLLECTED BY MOBILE GPSSIT  

Microsoft Academic Search

Rapid developments in information technologies widespread the applications of GIS in several professio nal disciplines. Technological improvements in mapping processes especially impact of GPS facilitated rapi d, complete and reliable data collection even for GIS. Mobile GPSSIT (GPS Sanal Istasyon Teknigi - GPS Virtual Station Technique) taking advantage of GPS has been developed as a detail measurement technique integr ating

Fatih GÜL

411

Load Balancing on Open Networks: A Mobile Agent Approach  

Microsoft Academic Search

In order to disperse the load on a Web server, generally the server cluster is configured to distribute access requests, or mirror servers are distributed geographically on different networks. Use of the Internet and the World-Wide-Web (WWW) has become widespread in recent years and mobile agent technology has proliferated at an equally rapid rate to evenly distribute the requests to

R. B. Patel; Neetu Aggarwal

2006-01-01

412

Development of novel wearable sensors for mobile health  

Microsoft Academic Search

In response to the world's rapidly ageing population, an intense area of research interest is mobile health (m-health) focused on ubiquitous patient-monitoring. While various biosignals are monitored using conventional methods, it is worthwhile to investigate alternative sensing approaches in order to improve accessibility of patients' health status. This paper presents the prototype of a “smart shirt” which makes use of

Kevin Hung; C. C. Lee; W. M. Chan; Sheung-On Choy; Paul Kwok

2012-01-01

413

Investigating Privacy-Augmented Displays for Mobile Devices  

Microsoft Academic Search

With more individuals accessing sensitive data in public situations, designers of mobile applications must determine the best ways to keep that information private. This research looks at using pixels, which convey information using color, in conjunction with text in order to maintain desired levels of privacy in otherwise non-private displays. Since privacy can vary according to a person's preferences, a

Andrea Grimes; Peter Tarasewich

414

Mobile radio data transmission—Coding for error control  

Microsoft Academic Search

Error patterns recorded during mobile radio data transmission experiments in London have been used to assess what error control strategies are required to achieve reliable data communication. The performance of error detecting and correcting codes has been investigated and the effects of varying code parameters explored. Results are given for transmission at 462 MHz using data rates of 1200 b\\/s

PETER J. MABEY

1978-01-01

415

Optimized combinations of abatement strategies for urban mobile sources  

Microsoft Academic Search

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

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

2000-01-01

416

Temporal variability of dust mobilization and concentration in source regions  

Microsoft Academic Search

The time-varying properties of dust mobilization and concentration variability in source areas are studied in model simulations to understand the processes that control entrainment of dust into the atmosphere. Two different meteorological reanalysis data sets (National Centers for Environmental Prediction\\/National Center for Atmospheric Research and NASA Data Assimilation Office) and two different source parameterizations are used for the analysis, which

Chao Luo; Natalie Mahowald; Charles Jones

2004-01-01

417

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

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

Adaptive System Support for Multimedia in Mobile End-Systems  

Microsoft Academic Search

Future computer users will work with a variety of end-systems which, at any given time, will either be disconnected, weakly connected by low speed wireless networks such as GSM or WaveLAN, or fully connected by fixed networks ranging from Ethernet to ATM. The level of connectivity will vary over time as a consequence of the mobility of the user. Ideally,

Michael Clarke; Tom Fitzpatrick; Geoff Coulson

1996-01-01

420

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

421

Data harvesting with mobile elements in wireless sensor networks  

Microsoft Academic Search

In recent studies, using mobile elements (MEs) as mechanical carriers to relay data has been shown to be an effective way of prolonging sensor network life time and relaying information in partitioned networks. As the data generation rates of sensors may vary, some sensors need to be visited more frequently than others. In this paper, a partitioning-based algo- rithm is

Yaoyao Gu; Doruk Bozdag; Robert W. Brewer; Eylem Ekici

2006-01-01

422

Partitioning based mobile element scheduling in wireless sensor networks  

Microsoft Academic Search

In recent studies, using mobile elements (MEs) as mechanical carriers of data has been shown to be an effective way of prolonging sensor network life time and relaying information in partitioned networks. As the data generation rates of sensors may vary, some sensors need to be visited more frequently than others. In this paper, a partitioning-based algorithm is presented that

Yaoyao Gu; D. Bozdag; Eylem Ekici; F. Ozguner; Chang-Gun Lee

2005-01-01

423

Context Awareness and Adaptation in Mobile Learning  

Microsoft Academic Search

This study investigates the importance of context-awareness and adaptation in mobile learning. Context-aware mobile learning that senses mobile environment and reacts to changing context during learning process has four interaction modes with three mobile entities of different mobility. Contexts in mobile learning are categorized into six dimensions that form a context space. Several mobile learning systems are examined according to

Yuan-kai Wang

2004-01-01

424

Correlation ion mobility spectroscopy  

SciTech Connect

Correlation ion mobility spectrometry (CIMS) uses gating modulation and correlation signal processing to improve IMS instrument performance. Closely spaced ion peaks can be resolved by adding discriminating codes to the gate and matched filtering for the received ion current signal, thereby improving sensitivity and resolution of an ion mobility spectrometer. CIMS can be used to improve the signal-to-noise ratio even for transient chemical samples. CIMS is especially advantageous for small geometry IMS drift tubes that can otherwise have poor resolution due to their small size.

Pfeifer, Kent B. (Los Lunas, NM); Rohde, Steven B. (Corrales, NM)

2008-08-26

425

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

426

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

427

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

NASA Astrophysics Data System (ADS)

Graphene with high carrier mobility ? is required both for graphene-based electronic devices and for the investigation of the fundamental properties of Dirac fermions. An attractive approach to increase the mobility is to place graphene in an environment with high static dielectric constant ? that would screen the electric field due to the charged impurities present near graphene's surface. Here we investigate the effect of the dielectric environment of graphene and study electrical transport in multi-terminal graphene devices suspended in liquids with ? ranging from 1.9 to 33. For non-polar liquids (?<5), we observe a rapid increase of ?(?), with room-temperature mobility reaching ~60,000 cm2 Vs-1 for devices in anisole (?=4.3). We associate this trend with dielectric screening of charged impurities adsorbed on graphene. We observe much lower mobility ?~20,000 cm2 Vs-1 for devices in polar liquids (??18) and explain it by additional scattering caused by ions present in such liquids.

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

2012-03-01

428

Mobile computing in a New Zealand Bachelor of Nursing Programme.  

PubMed

Mobile computing is rapidly becoming a reality in New Zealand health care settings. Personal Digital Assistants (PDAs) are the most frequently used of these mobile technologies, giving nurses access to clinical learning resources, including drug references, medical encyclopaedias and diagnostic information. The implementation of mobile computing at Waikato Institute of Technology (Wintec) will ensure graduates of our Bachelor of Nursing Programme are able to meet health care service demands for knowledge in contemporary information technologies as well as the information technology requirements defined by the Nursing Council of New Zealand and the Health Practitioners Competency Assurance Act 2003 for registration as a nurse in New Zealand. This opinion paper presents strategies for the implementation of mobile computing as a core element of the curriculum for the Bachelor of Nursing Programme at Wintec in Hamilton, New Zealand. PMID:17102332

McClunie-Trust, Patricia

2006-01-01

429

Mobility of icy sand packs, with application to Martian permafrost  

NASA Astrophysics Data System (ADS)

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.

Durham, William B.; Pathare, Asmin V.; Stern, Laura A.; Lenferink, Hendrik J.

2009-12-01

430

Thermal effects on electrospray ionization ion mobility spectrometry  

NASA Astrophysics Data System (ADS)

A cooled electrospray ionization source was used to introduce liquid sample into an ion mobility spectrometer. This uniquely designed electrospray ionization source eliminated problems encountered in the past when electrospray sources were interfaced to ion mobility spectrometers. Advantages of this electrospray ionization ion mobility instrument included high temperature operation for rapid desolvation of sprayed droplets, prevention of solute precipitation in the spray needle, efficient transmission of ion spray into the spectrometer and complete elimination of corona ionization. Parametric investigations included drift tube temperature, spray needle temperature, solvent flow rate and electrospray voltage. Ion mobility spectra of cytochrome c and poly(ethylene glycol) demonstrated good sensitivity and resolution for high molecular weight compounds sprayed from liquid samples.

Chen, Yong Hong; Hill, Herbert H.; Wittmer, Douglas P.

1996-05-01

431

Going mobile: substitutability between fixed and mobile access  

Microsoft Academic Search

We empirically estimate the substitutability of fixed and mobile services for telecommunications access using a large, US household survey conducted over the period 2000-2001. Estimated cross-price elasticities confirm that second fixed line and mobile services are substitutes for one another. The extent of fixed-mobile substitution has important implications for policy toward fixed network unbundling, fixed-mobile vertical separation, and universal service.

Mark Rodini; Michael Robert Ward; Glenn A. Woroch

2003-01-01

432

Deceit, diversity, or mobilization?  

Microsoft Academic Search

What explains President Bush's increased vote in the State of Florida in the 2004 election? A common perception is that implementation of electronic voting machines and a surge in GOP registration increased Bush's vote margins relative to the 2000 election. In this paper we offer an alternative explanation: massive Puerto Rican immigration combined with successful Republican mobilization of this group

Benjamin G. Bishin; Casey A. Klofstad

2009-01-01

433

Mobility of Stretched Water.  

National Technical Information Service (NTIS)

To study the mobility of stretched SPC/E water and its dependance on temperature and density we performed five molecular dynamics computer simulation runs. Three runs were performed at temperature 300 K and densities 1.0 g/cc, 0.9 g/cc and 0.8 g/cc. Two m...

I. Vaisman L. Perera M. L. Berkowitz

1993-01-01

434

Boron mobility in plants  

Microsoft Academic Search

In the majority of plant species, B distribution between plant organs and the symptoms of B deficiency and toxicity indicate that B has restricted mobility. Nevertheless, B is present in phloem and is retranslocated in phloem, often in sufficient amounts to satisfy the demands of developing sink regions that do not readily transpire. In species that produce significant amounts of

Barry J. Shelp; Eduardo Marentes; Alice M. Kitheka; Pathmanathan Vivekanandan

1995-01-01

435

Boron mobility in plants  

Microsoft Academic Search

In the majority of plant species, B distribution between plant organs and the symptoms of B deficiency and toxicity indicate that B has restricted mobility. Nevertheless, B is present in phloem and is retranslocated in phloem, often in sufficient amounts to satisfy the demands of developing sink regions that do not readily transpire. In species that produce significant amounts of

Patrick H. Brown; Barry J. Shelp

1997-01-01

436

Mobil launches coal career  

Microsoft Academic Search

Caballo Rojo, Mobil's new surface mine, in the Wyoming Powder River Basin, began shipping coal to Sunflower Electric Cooperative in Kansas in April. The size of the operation--320 million tons in 5800 acres-- dictated new design requirements. Topsoil removal, drilling, overburden stripping, stockpiling, and loading are all specified as to equipment. The technical progression system is based on seniority. The

1983-01-01

437

Mobile Learning with Patterns  

Microsoft Academic Search

The identification and construction of patterns play a fundamental role in learning, but to date design patterns have been used for communication between professionals, rather than for learning purposes. We adapt the design pattern approach and develop software for mobile and other touch-sensitive devices in order to support design students to learn with patterns. We describe the multi-platform system and

Henning Breuer; Gustavo Zurita; Nelson Baloian; Mitsuji Matsumoto

2008-01-01

438

Anonymous Mobile Conference Calls  

Microsoft Academic Search

This paper describes an architecture and protocol for making anonymous mobile conference calls. A number of examples exist where multiple users may wish to communicate in an anonymous manner, such as anonymous virtual support groups (e.g Alcoholics Anonymous). Anonymous group identification schemes coupled with the novel idea of Virtual Numbers, allows for identification to a conference call facility where access

N. J Croft; M. S Olivier

439

Mobile Lifting Jack.  

National Technical Information Service (NTIS)

A mobile jack, particularly for use in installation of support beams in underground mines, is disclosed. The jack comprises a wheel-mounted frame and a hydraulic lifting arm having a jack head which is horizontally rotatable 360 deg. The lifting arm is al...

R. L. Unger T. G. Bobick

1987-01-01

440

Advanced mobile phone service  

Microsoft Academic Search

The advanced mobile phone service (AMPS) system, an FM cellular radio system in the final stages of development, is described. A brief description of the system is followed by a discussion of the control algorithms which are basic to its operation. Finally, a status report is presented on the Chicago developmental system (an operational cellular system) and the cellular test

F. H. Blecher

1980-01-01

441

Effects of Mobile Communication  

Microsoft Academic Search

Before reviewing some of the key consequences of mobile communication technology, a brief discussion of how they fit within the media effects paradigm is in order. At the risk of oversimplification, we understand the media effects paradigm as a framework for understanding how mass media content influences attitudes and behavior of audience members. To be fair, it is important to

Scott W. Campbell

442

A Mobile Education  

ERIC Educational Resources Information Center

|Since 2008, when iStanford stormed onto the college scene as the first campus mobile app, schools from Amarillo College (Texas) to Vanderbilt University (Tennessee) have rushed to create their own offerings. Some have elected to do the work in-house; others have licensed the software from a vendor. Still others hope to bottle the same magic that…

Schaffhauser, Dian

2011-01-01

443

The IPA Mobility Program.  

ERIC Educational Resources Information Center

The Intergovernmental Personnel Act of 1970 Mobility Program and the procedure for applying for one of the temporary positions offered by the program are discussed. It is suggested that faculty members and university administrators are strong candidates for these positions in public policy development and government research. (SF)

Ershkowitz, Miriam

1979-01-01

444

MOBILE MENTORING FOR DIABETES  

Microsoft Academic Search

Mobile devices offer considerable potential for educational applications, allowing users to learn when and where they want to. Recent health strategy has promoted the concept of the Expert Patient who has developed a high level of knowledge and expertise to enable them to manage their own condition. This requires focused instruction and health professional intervention. In this paper we discuss

Lynne Newall; Gareth Paley; Adrian Gordon; Russell James

445

Wars of Mobility  

Microsoft Academic Search

In the aftermath of 9\\/11, world leaders addressed the nation as a body under threat and hastened in new policies to bolster border protection and ‘securitize’ immigration. While the terrorist attacks cast new forms of public attention on the risks posed by mobile agents, the link between national security and regulating migration has always been at the forefront of the

Nikos Papastergiadis

2010-01-01

446

Cavitands with Mobile Walls  

PubMed Central

Deep cavitands having three fixed walls and one mobile wall were prepared. The longer wall, built from a quinoxaline spacer, showed enhanced NMR spectra of guests, but the shorter wall based on a benzene spacer showed tighter binding and slower exchange of guests.

Xiao, Shengxiong; Ajami, Dariush; Rebek, Julius

2009-01-01

447

Mobile Equipment Expands Inventory.  

ERIC Educational Resources Information Center

|Describes the Mobile Equipment Modules (MEM) system in Duluth, Minnesota. MEM is a way to hold down costs and increase learning opportunities by consolidating purchases of expensive shop equipment within the school district, grouping the equipment in modules, and scheduling and moving it from school to school as needed. (MF)|

McGough, Robert L.; And Others

1978-01-01

448

Tourism and Mobile Technology  

Microsoft Academic Search

While tourism presents considerable potential for the use of new mobile technologies, we currently have little understanding of how tourists organise their activities or of the problems they face. This paper presents an ethnographic study of city tourists' practices that draws out a number of implications for designing tourist technology. We describe how tourists work together in groups, collaborate around

Barry Brown; Matthew Chalmers

2003-01-01

449

The new mobilities paradigm  

Microsoft Academic Search

It seems that a new paradigm is being formed within the social sciences, the ‘new mobilities’ paradigm. Some recent contributions to forming and stabilising this new paradigm include work from anthropology, cultural studies, geography, migration studies, science and technology studies, tourism and transport studies, and sociology. In this paper we draw out some characteristics, properties, and implications of this emergent

Mimi Sheller; John Urry

2006-01-01

450

Socializing in mobile gaming  

Microsoft Academic Search

Currently the most prevalent format for mobile gaming is the single-player variety, where users interact with the game's artificial intelligence within a number of genres such as sports, action, racing, and puzzle games, etc. The users install the game and play it for entertainment and to pass the time until repetitiveness and boredom prompts them to stop playing that game

Sheila A. Paul; Marianne Jensen; Chui Yin Wong; Chee-weng Khong

2008-01-01

451

Teacher Mobility and Allocation.  

National Technical Information Service (NTIS)

The paper presents results from an examination of teacher flows within a large city school system. The focus is primarily on the mobility of teachers among schools within the system, the movement of teachers into and out of the system, and the effect of t...

D. Greenberg J. McCall

1974-01-01

452

Intelligent mobile security systems  

Microsoft Academic Search

This paper reports that mobile security systems are becoming increasingly important to military (Army, Air Force) and non-military (Drug Enforcement Agency, Border Patrol) organizations as the level and sophistication of terrorist activity increases. Frequently, organizations are required to deploy at remote sites on little notice. To ensure protection of life and equipment, security systems are sometimes required. Often, the personnel

1991-01-01

453

Persuasive Mobile Health Applications  

Microsoft Academic Search

With many industrialized societies bearing the cost of an increasingly sedentary lifestyle on the health of their populations there is a need to find new ways of encouraging physical activity to promote better health and well being. With the increasing power of mobile phones and the recent emergence of personal heart rate monitors, aimed at dedicated amateur runners, there is

Carlos Garcia Wylie; Paul Coulton

2008-01-01

454

MOBILE INJECTION TREATMENT UNIT  

Microsoft Academic Search

CBA Environmental Services (CBA) has developed and patented an innovative environmental remediation technology known as the Mobile Injection Treatment Unit (MITU). The MITU was originally designed to remove volatile organic contaminants (VOCs) through the use of hot air injection and soil mixing. CBA has improved the process of in-situ enhanced thermal desorption and expanded the capabilities of the MITU to

Bruce L. Bruso; Clark A. Romberger

455

Security enhanced mobile agents  

Microsoft Academic Search

This paper describes a security model for mobile agent based systems. The model defines the notion of a security-enhanced agent and outlines security management components in agent platform bases and considers secure migration of agents from one base to another. The security enhanced agent carries a passport that contains its security credentials and some related security code. Then we describe

Vijay Varadharajan

2000-01-01

456

Mobile Code Security  

Microsoft Academic Search

Mobile code is an exciting new technology. By its very nature, however, it is fraught withinherent security risks. In the paper, we give an overview of some of the techniques for securingmobile code environments that have been suggested and deployed. We examine the sandboxapproach, code signing, hybrid approaches, firewalling techniques and proof carrying code. Therelative merits of each approach are

Aviel D. Rubin; Daniel E. Geer Jr.

1998-01-01

457

Mobile Learning for All  

ERIC Educational Resources Information Center

|Parents and educational professionals are asking the question, "Are schools preparing students for their future lives?" Mobile technologies such as smart phones, iPods, GPS systems, iPads, and a constant stream of information drive much of people's world and work. The use of such technologies increases with each passing day. But how often do…

Bestwick, Angel; Campbell, John R.

2010-01-01

458

Urban Mobility Report, 2010.  

National Technical Information Service (NTIS)

Congestion is still a problem in America's 439 urban areas. The economic recession and slow recovery of the last three years, however, have slowed the seemingly inexorable decline in mobility. Readers and policy makers might be tempted to view this as a c...

D. Schrank S. Turner T. Lomax

2010-01-01

459

NASA Computational Mobility.  

National Technical Information Service (NTIS)

This blue sky study was conducted in order to study the feasibility and scope of the notion of Computational Mobility to potential NASA applications such as control of multiple robotic platforms. The study was started on July lst, 2003 and concluded on Se...

2004-01-01

460

Social-Mobile Applications  

Microsoft Academic Search

Mobile communications devices and applications are primarily designed to increase efficiency and productivity for professionals on the go. However, users invariably appropriate such technology to meet their social needs as well. For many people, particularly younger users, BlackBerry devices, Hiptops, and other handhelds primarily have a social function. A few small companies are beginning to exploit the growing demand for

Ian Smith

2005-01-01

461

Spaceborne Mobile Ad-Hoc Networks  

NASA Astrophysics Data System (ADS)

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

Forcada, I.; Strauss, A.

2010-08-01

462

Hybrid Checkpoint Protocol for Supporting Mobile-to-Mobile Communication  

Microsoft Academic Search

Some information systems consist of mobile stations and fixed stations. Mission critical applications are required to execute fault-tolerance in these systems. However, the mobile stations support neither enough volume of storage, processing power nor battery capacity to provide reliable communication and computation. Thus, it is difficult for multiple mobile stations to synchronously take checkpoints. We propose a hybrid checkpointing protocol

Yoshinori Morita; Hiroaki Higaki

2001-01-01

463

Mobile IP LAN for ARL Mobile Communications/Networking Testbed.  

National Technical Information Service (NTIS)

This report describes the protocol and implementation of a Mobile IP (Internet protocol) LAN (local area network) for the LAN of the U.S. Army Research Laboratory (ARL) Mobile Communications/Networking Testbed. Mobile IP LAN protocol is developed to allow...

B. B. Luu

2001-01-01

464

Molecular chaperones function as steroid receptor nuclear mobility factors.  

PubMed

Live cell imaging has revealed the rapid mobility of steroid hormone receptors within nuclei and their dynamic exchange at transcriptionally active target sites. Although a number of other proteins have been shown to be highly mobile within nuclei, the identity of soluble factors responsible for orchestrating nuclear trafficking remains unknown. We have developed a previously undescribed in situ subnuclear trafficking assay that generates transcriptionally active nuclei, which are depleted of soluble factors required for the nuclear mobility of glucocorticoid (GR) and progesterone receptors (PR). Using this system and a fluorescence recovery after photobleaching technique, we demonstrate that nuclear mobility of GR recovered on incubation with reticulocyte lysate was inhibited by geldanamycin, a drug that blocks the chaperone activity of heat-shock protein 90. Direct proof of molecular chaperone involvement in steroid receptor subnuclear trafficking was provided by the ATP-dependent recovery of nuclear mobility of GR and PR on incubation with various combinations of purified chaperone and/or cochaperone proteins. Additionally, for both receptors, the inclusion of hormone during the recovery period leads to a retardation of nuclear mobility. Thus, our results provide a description of soluble nuclear mobility factors and furthermore demonstrate a previously unrecognized role for molecular chaperones in the regulation of steroid receptor function within the nucleus. PMID:14978266

Elbi, Cem; Walker, Dawn A; Romero, Guillermo; Sullivan, William P; Toft, David O; Hager, Gordon L; DeFranco, Donald B

2004-02-20

465

Impairments in mobility and balance in relation to frailty.  

PubMed

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

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

2010-08-01

466

Stability of mass varying particle lumps  

NASA Astrophysics Data System (ADS)

The theoretical description of compact structures that share some features with mass varying particles allows for a simple analysis of the equilibrium and stability for massive stellar bodies. We investigate static, spherically symmetric solutions of Einstein equations for a system composed by nonbaryonic matter (neutrinos or dark matter) which forms stable structures through attractive forces mediated by a background scalar field (dark energy). Assuming that the dark matter, or massive neutrinos, consists of a gas of weakly interacting particles, the coupling with the scalar field is translated into an effective dependence of the mass of the compounding particle on the radial coordinate of the curved spacetime. The stability analysis reveals that these static solutions become dynamically unstable for different Buchdahl limits of the ratio between the total mass energy and the stellar radius, M/R. We also find regular solutions that for an external observer resemble Schwarzschild black holes. Our analysis leaves unanswered the question whether such solutions, which are both regular and stable, do exist.

Bernardini, A. E.; Bertolami, O.

2009-12-01

467

Microsatellites in varied arenas of research.  

PubMed

Microsatellites known as simple-sequence repeats (SSRs) or short-tandem repeats (STRs), represent specific sequences of DNA consisting of tandemly repeated units of one to six nucleotides. The repetitive nature of microsatellites makes them particularly prone to grow or shrink in length and these changes can have both good and bad consequences for the organisms that possess them. They are responsible for various neurological diseases and hence the same cause is now utilized for the early detection of various diseases, such as, Schizophrenia and Bipolar Disorder, Congenital generalized Hypertrichosis, Asthma, and Bronchial Hyperresponsiveness. These agents are widely used for forensic identification and relatedness testing, and are predominant genetic markers in this area of application. The application of microsatellites is an extending web and covers the varied scenarios of science, such as, conservation biology, plant genetics, and population studies. At present, researches are progressing round the globe to extend the use of these genetic repeaters to unmask the hidden genetic secrets behind the creation of the world. PMID:21814449

Remya, K S; Joseph, Sigimol; Lakshmi, P K; Akhila, S

2010-04-01

468

Microsatellites in varied arenas of research  

PubMed Central

Microsatellites known as simple-sequence repeats (SSRs) or short-tandem repeats (STRs), represent specific sequences of DNA consisting of tandemly repeated units of one to six nucleotides. The repetitive nature of microsatellites makes them particularly prone to grow or shrink in length and these changes can have both good and bad consequences for the organisms that possess them. They are responsible for various neurological diseases and hence the same cause is now utilized for the early detection of various diseases, such as, Schizophrenia and Bipolar Disorder, Congenital generalized Hypertrichosis, Asthma, and Bronchial Hyperresponsiveness. These agents are widely used for forensic identification and relatedness testing, and are predominant genetic markers in this area of application. The application of microsatellites is an extending web and covers the varied scenarios of science, such as, conservation biology, plant genetics, and population studies. At present, researches are progressing round the globe to extend the use of these genetic repeaters to unmask the hidden genetic secrets behind the creation of the world.

Remya, K. S.; Joseph, Sigimol; Lakshmi, P. K.; Akhila, S.

2010-01-01

469

Vector curvaton with varying kinetic function  

SciTech Connect

A new model realization of the vector curvaton paradigm is presented and analyzed. The model consists of a single massive Abelian vector field, with a Maxwell-type kinetic term. By assuming that the kinetic function and the mass of the vector field are appropriately varying during inflation, it is shown that a scale-invariant spectrum of superhorizon perturbations can be generated. These perturbations can contribute to the curvature perturbation of the Universe. If the vector field remains light at the end of inflation it is found that it can generate substantial statistical anisotropy in the spectrum and bispectrum of the curvature perturbation. In this case the non-Gaussianity in the curvature perturbation is predominantly anisotropic, which will be a testable prediction in the near future. If, on the other hand, the vector field is heavy at the end of inflation then it is demonstrated that particle production is approximately isotropic and the vector field alone can give rise to the curvature perturbation, without directly involving any fundamental scalar field. The parameter space for both possibilities is shown to be substantial. Finally, toy models are presented which show that the desired variation of the mass and kinetic function of the vector field can be realistically obtained, without unnatural tunings, in the context of supergravity or superstrings.

Dimopoulos, Konstantinos; Karciauskas, Mindaugas; Wagstaff, Jacques M. [Physics Department, Lancaster University, Lancaster LA1 4YB (United Kingdom)

2010-01-15

470

Varying Collimation for Dark-Field Extraction  

PubMed Central

Although x-ray imaging is widely used in biomedical applications, biological soft tissues have small density changes, leading to low contrast resolution for attenuation-based x-ray imaging. Over the past years, x-ray small-angle scattering was studied as a new contrast mechanism to enhance subtle structural variation within the soft tissue. In this paper, we present a detection method to extract this type of x-ray scattering data, which are also referred to as dark-field signals. The key idea is to acquire an x-ray projection multiple times with varying collimation before an x-ray detector array. The projection data acquired with a collimator of a sufficiently high collimation aspect ratio contain mainly the primary beam with little scattering, while the data acquired with an appropriately reduced collimation aspect ratio include both the primary beam and small-angle scattering signals. Then, analysis of these corresponding datasets will produce desirable dark-field signals; for example, via digitally subtraction. In the numerical experiments, the feasibility of our dark-field detection technology is demonstrated in Monte Carlo simulation. The results show that the acquired dark field signals can clearly reveal the structural information of tissues in terms of Rayleigh scattering characteristics.

Wang, Ge; Cong, Wenxiang; Shen, Haiou; Zou, Yu

2009-01-01

471

Filtration behavior of slurries with varying compressibilities  

SciTech Connect

A novel filtration apparatus allows simultaneous measurements of filtrate volume, hydraulic pressure and cake thickness using slurry volumes on the order of 100 cm/sup 3/. Differences in interparticle interactions were studied by varying the barium chloride concentration of 0.38-..mu..m polystyrene latex and filtering at pressures between 2 and 100 psi. Cakes formed from these slurries are highly compressible for concentrations between 0.01M and 0.10M, moderately compressible for the 0.005M concentration, and incompressible for the 0.001M concentration. Plots of filtrate volume versus cake thickness were linear for the incompressible cakes, whereas the compressible cakes showed significant deviations, which were pressure dependent. The pressure distribution for the incompressible cake was found to be essentially linear as predicted from the resistance plots assuming constant ..cap alpha.. and epsilon. For the highly compressible cakes, most of the pressure drop appears to occur near the cake/medium interface with only small changes occurring at the top of the cake.

Massuda, M.; Bridger, K.; Harvey, M.; Tiller, F.M.

1988-10-01

472

Dermatophyte susceptibility varies towards antimicrobial textiles.  

PubMed

Dermatophytoses are a widespread problem worldwide. Textiles in contact with infected skin can serve as a carrier for fungus propagation. Hitherto, it is unknown, whether antifungal textiles could contribute in controlling dermatophytes e.g. by disrupting the chain of infection. Testing of antimicrobial fabrics for their antifungal activities therefore is a fundamental prerequisite to assess the putative clinical relevance of textiles for dermatophyte prevention. Fabrics finished with either didecyldimethylammonium chloride (DDAC), poly-hexamethylenbiguanide, copper and two silver chloride concentrations were tested for their antifungal activity against Trichophyton rubrum, Trichophyton mentagrophytes and Candida albicans. To prove dermatophyte susceptibility towards the textiles, swatches were subjected to DIN EN 14199 (Trichophyton sp.) or DIN EN ISO 20743 (C.?albicans) respectively. In addition, samples were embedded, and semi-thin sections were analysed microscopically. While all samples showed a clear inhibition of C.?albicans, activity against Trichophyton sp. varied significantly: For example, DDAC completely inhibited T.?rubrum growth, whereas T.?mentagrophytes growth remained unaffected even in direct contact to the fibres. The results favour to add T.?mentagrophytes as a test organism in textile dermatophyte efficacy tests. Microscopic analysis of swatches allowed detailed evaluation of additional parameters like mycelium thickness, density and hyphae penetration depth into the fabric. PMID:21914005

Hammer, Timo R; Mucha, Helmut; Hoefer, Dirk

2011-09-13

473

Robonaut Mobile Autonomy: Initial Experiments.  

National Technical Information Service (NTIS)

A mobile version of the NASA/DARPA Robonaut humanoid recently completed initial autonomy trials working directly with humans in cluttered environments. This compact robot combines the upper body of the Robonaut system with a Segway Robotic Mobility Platfo...

M. A. Diftler R. O. Ambrose S. M. Goza K. S. Tyree E. L. Huber

2006-01-01

474

Social Mobility and Social Participation  

ERIC Educational Resources Information Center

|Examines data related to social mobility and social participation of Americans. Topics include educational and occupational mobility; voting; volunteer work; charitable giving; community participation; views on religion; and anomie. For journal availability, see SO 506 144. (Author/DB)|

Sewell, William H.

1978-01-01

475

T-Mobile: Strategic Analysis  

Microsoft Academic Search

This project is a Capstone Project completed at the end of our MBA career. It is a strategic analysis of T-Mobile (ca. 2006) focusing on T-Mobile's opportunities in the wireless telecommunication's arena in the United States.

Apostolos Koutropoulos; Glenn Charbonneau

2006-01-01

476

Social mobility and educational selection  

Microsoft Academic Search

There is a close interactive relationship between social mobility and educational selection. On one side, the character, direction,\\u000a speed, level, methods and trends of social mobility affect the aims, goals, functions, scope, strategy, content and methods\\u000a of choice in education. On the other side, the goals, basis and means of choosing education promote inter-generational social\\u000a mobility, competitive mobility and structural

Zefang Dong; Yanbin Wang; Wenjiao Chen

2009-01-01

477

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

2012-02-28

478

Microwave and Electromagnetic Fields Effects on Human Bodies and Comparision of International Standarts and Measurements of Base Stations and Mobile Phones  

Microsoft Academic Search

The demand for mobile communication has been increasing rapidly day by day. The number of subscribers of mobile communications is approximately a billion in the world in 2001. Resulting from this interest many researches and studies have been conducted for the prediction of the effects of mobile communication on the human health. Various countries and institutions have defined some standards

N. Erol OZGUNER; I. Hakki CAVDAR

479

3-D MIMO Mobile-to-Mobile Channel Simulation  

Microsoft Academic Search

Mobile-to-mobile (M-to-M) radio propagation channels arise in inter-vehicular communications, mobile ad-hoc wireless networks, and relay-based cellular radio networks. The statistical properties of M-to-M channels are quite different from conventional flxed-to-mobile (F-to-M) cellular land mobile radio channels. This article presents a 3D mathematical reference model for multiple-input multiple-output (MIMO) M-to-M channels. Based on this model, a sum-of-sinusoids based simulation model is

Alenka G. Zajic; G. L. Stuber

2007-01-01

480

MOBILE NETWORKING TECHNOLOGY WITHIN INSC  

Microsoft Academic Search

We provide an overview of the INSC Mobility Task area efforts including: a brief overview of technology areas investigated, a discussion of research developments, and example results from experimentation and demonstration. The main areas investigated were Mobile Ad hoc Network (MANET) routing and mobile IP version 6 (MIPv6) protocols. Early simulation efforts were performed along with more recent network emulation

Joseph P. Macker

481

Characteristics of Mobile Payment Procedures  

Microsoft Academic Search

Companies are not going to invest into the development of innovative applications or services unless these can be charged for appropriately. Thus, the existence of standardized and widely accepted mobile payment procedures is crucial for successful business-to-customer mobile commerce. The acceptance of mobile payment procedures depends on costs, security and convenience issues. For the latter, it is important that a

Nina Kreyer; Klaus Turowski

2002-01-01

482

Continuously Connected With Mobile IP.  

National Technical Information Service (NTIS)

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 w...

2002-01-01

483

Coordination in Mobile Agent Applications  

Microsoft Academic Search

The paper addresses the issue of coordination in distributed app lications based on mobile agents. The presence of mobile active computational entities makes traditional coordination models based on message-passing, such a s the c lient-server one, not effective, from both the performance and the usability points of view. Indirect coordination models suit better the mobile scenario: interactions occur via blackboards

Giacomo Cabri; Letizia Leonardi; Franco Zambonelli

1997-01-01

484

Reweaving UMA: Urbanism Mobility Architecture  

Microsoft Academic Search

The immediate context of this book is the changing theoretical debate within and around mobility. After decades of stagnation into quantitative problem-solving approaches and models of functional organisation the discourse on mobility is now taking its moves - once again - from within the fields of urban design and architecture. However, although there is a growing awareness that mobility is

L. M. Calabrese

2004-01-01

485

Mobile Agents in Wireless Devices  

Microsoft Academic Search

The networks that connect handheld wireless devices such as cell phones and PDAs suffer from low bandwidth and a high incidence of network errors. By employing mobile agents, such devices could provide a reliable technology for message transport over wireless links. Mobile agents are inherently distributed software entities that reduce the load on the network when they move. Mobile agents

Luminita Vasiu; Qusay H. Mahmoud

2004-01-01

486

Navigation Support for Mobile Learning  

Microsoft Academic Search

Mobile learning exposes learning to the natural environment. If this environment is large, the learners have to navigate to find the learning objects or to explore the environment. Current mobile learning systems provide only minimal navigational support. Prior studies report that conventional pedestrian information systems are not suited to mobile learning, as the learners focus too much on the navigation

Christoph Göth; Gerhard Schwabe

2010-01-01

487

Creating a Mobile Library Website  

ERIC Educational Resources Information Center

|The overwhelming results were iPhones and Android devices. Since the library wasn't equipped technologically to develop an in-house application platform and because we wanted the content to work across all mobile platforms, we decided to focus on creating a mobile web-based platform. From the NLM page of mobile sites we chose the basic PubMed/…

Cutshall, Tom C.; Blake, Lindsay; Bandy, Sandra L.

2011-01-01

488

Location Based Services Enterprise Mobility  

Microsoft Academic Search

The main concept of location based services enterprise mobility (LBS-EM) is to grab the information of location based objects, which are specified such as restaurant, hospitals, IT companies etc, and the same to view on the mobile device. LBS works similar to the yellow pages where you have to search for the specified object. To avail a beneficial mobile access

Vimal Joy; S. Sridevi; P. Vimal Laxman

2008-01-01

489

Map Design for Mobile Display  

Microsoft Academic Search

How to effectively represent spatial information on handheld mobile devices is a key question given the increasing use of personal digital assistants (PDAs) and cellphones concurrent with the development of location-based services. The mobile use of digital maps on small displays presents new capabilities and challenges that differ from using paper maps in a mobile setting or viewing digital maps

Julie Dillemuth

490

SAFETY DISTANCES IN MOBILE COMMUNICATIONS  

Microsoft Academic Search

For more than 60 years the electromagnetic spectrum has been used from most people solely for receiving broadcast and TV. Since several years individual mobile communication leads not only to a rise in spectrum use but also to a growing number of mobile base stations. The increasing number of these base stations in mobile communications causes considerations about possible adverse

MICHAEL BALDAUF; ALEXANDER HERSCHLEIN; WERNER SÖRGEL; WERNER WIESBECK

491

Travel Tales. A Mobility Storybook.  

ERIC Educational Resources Information Center

|The book is designed to supplement mobility and orientation lessons and explain mobility concepts to visually impaired children from preschool through third grade. Each of the 17 chapters centers on the adventures of Eliot, a young visually impaired child, as he learns the following pre-cane orientation and mobility skills: sighted-guide…

Halpern-Gold, Julia; And Others

492

Multiversion Reconciliation for Mobile Databases  

Microsoft Academic Search

As mobile computing devices become more and more popular, mobile databases have started gain- ing popularity. An important feature of these database systems is their ability to allow optimistic replication of data by permitting disconnected mobile devices to perform local updates on replicated data. The fundamental problem in this approach is the reconciliation problem, i.e. the problem of serializing potentially

Shirish Hemant Phatak; B. R. Badrinath

1999-01-01

493

Volume Visualization on Mobile Devices  

Microsoft Academic Search

With the advent of high-bandwidth wireless networks and pervasive computing, the space and platform barriers for visualization are being broken. Mobile visualization, or ubiquitous visualization, allows users to visualize data anywhere, anytime, on various mobile devices connected by wireless networks. In this paper, we investigate how to achieve volume visualization on mobile devices. We present a client-obliviousdata model for various

Hong Zhou; Huamin Qu; Yingcai Wu; Ming-Yuen Chan

494

Travel Tales. A Mobility Storybook.  

ERIC Educational Resources Information Center

The book is designed to supplement mobility and orientation lessons and explain mobility concepts to visually impaired children from preschool through third grade. Each of the 17 chapters centers on the adventures of Eliot, a young visually impaired child, as he learns the following pre-cane orientation and mobility skills: sighted-guide…

Halpern-Gold, Julia; And Others

495

Libraries and the Mobile Revolution  

ERIC Educational Resources Information Center

|With the advent of mobile phones--and smartphones in particular--people are slowly moving away from the notion that mobile phones are just for making calls and texting. This coupled with the fact that the uptake of mobile phones hit the 5 billion mark in 2010 has spurred many libraries to offer services that can be used by their patrons on these…

Krishnan, Yvonne

2011-01-01

496

The Universal Mobile Telecommunication System  

Microsoft Academic Search

The concepts, requirements, and technologies of Europe's third generation mobile communication system-the Universal Mobile Telecommunications System (UMTS)-are discussed. The cellular architecture, radio resource, adaptive resource allocation and handover enabling techniques for realizing an effective UMTS access network are described. The modulation schemes, multiple access methods, and duplexing methods used in the third generation mobile system's flexible radio interface are also

Stanley Chia

1992-01-01

497

UMAR: Ubiquitous Mobile Augmented Reality  

Microsoft Academic Search

In this paper we discuss the prospects of using marker based Augmented Reality for context aware applications on mobile phones. We also present the UMAR, a conceptual framework for developing Ubiquitous Mobile Augmented Reality applications which consists of research areas identified as relevant for successfully bridging the physical world and the digital domain using Mobile Augmented Reality. A step towards

Anders Henrysson; Mark Ollila

2004-01-01

498

Causal Multicast in Mobile Networks  

Microsoft Academic Search

Distributed applications using file sharing and file replication, conferencing, and delivery in multimedia systems often need to use the semantics of causal multicast. Causal multicast in a mobile system is complicated by the various limitations imposed by the mobile system. Though there are different directions to improve the performance of causal multicast algorithms in mobile systems, at the core of

Punit Chandra; Ajay D. Kshemkalyani

2004-01-01

499

Zonadhesin D3-Polypeptides Vary among Species but Are Similar in Equus Species Capable of Interbreeding1  

PubMed Central

Zonadhesin is a rapidly evolving protein in the sperm acrosome that confers species specificity to sperm-zona pellucida adhesion. Though structural variation in zonadhesin likely contributes to its species-specific function, the protein has not previously been characterized in organisms capable of interbreeding. Here we compared properties of zonadhesin in several animals, including the horse (Equus caballus), donkey (E. asinus), and Grevy's zebra (E. grevyi) to determine if variation in zonadhesin correlates with ability of gametes to cross-fertilize. Zonadhesin localized to the apical acrosomes of spermatozoa from all three Equus species, similar to its localization in other animals. Likewise, in horse and donkey testis, zonadhesin was detected only in germ cells, first in the acrosomal granule of round spermatids and then in the developing acrosomes of elongating spermatids. Among non-Equus species, D3-domain polypeptides of mature, processed zonadhesin varied markedly in size and detergent solubility. However, zonadhesin D3-domain polypeptides in horse, donkey, and zebra spermatozoa exhibited identical electrophoretic mobility and detergent solubility. Equus zonadhesin D3-polypeptides (p110/p80 doublet) were most similar in size to porcine and bovine zonadhesin D3-polypeptides (p105). Sequence comparisons revealed that the horse zonadhesin precursor's domain content and arrangement are similar to those of zonadhesin from other large animals. Partial sequences of horse and donkey zonadhesin were much more similar to each other (>99% identity) than they were to orthologous sequences of human, pig, rabbit, and mouse zonadhesin (52%–72% identity). We conclude that conservation of zonadhesin D3-polypeptide properties correlates with ability of Equus species to interbreed.

Tardif, Steve; Brady, Heidi A.; Breazeale, Kelly R.; Bi, Ming; Thompson, Leslie D.; Bruemmer, Jason E.; Bailey, Laura B.; Hardy, Daniel M.

2009-01-01

500

Rapid Prototyping of Tools.  

National Technical Information Service (NTIS)

The report describes a system for rapid tool manufacturing based on the integration of stereolithograph and thermal spraying. With stereolithography apparatus (SLA), plastic prototype models are built directly from a vat of liquid photocurable polymer by ...

E. L. Gursoz F. B. Prinz L. E. Weiss P. S. Fussell S. Mahalingham

1989-01-01