gebhart/patrepeval huggingface dataset:
Network Integrity in Mobile Robotic Networks (2012)

Most coordinated tasks performed by teams of mobile robots require reliable communications between team members. Therefore, task accomplishment requires that robots navigate their environment with their collective movement restricted to formations that guarantee integrity of the communication network. Maintaining this communication capability induces physical constraints on trajectories but also requires determination of communication variables like routes and transmitted powers. This problem is addressed here using a distributed hybrid approach. Continuous distributed motion controllers based on potential fields interact with discrete distributed optimization of communication variables to result in a multi-robot network ensuring communication integrity. The definition of network integrity differs from existing approaches in that it is not based only on the topology of the network but also on metrics that are of interest to the performance of communication between robots and a fixed infrastructure. Specifically, integrity is defined as the ability of the network to support desired communication rates. The ability of the hybrid controller to guarantee communication integrity while robots move to accomplish their task is studied theoretically and numerically.
A facile, versatile procedure for the preparation of fatty acid esters suitable for glc or hplc analyses (1981)

The preparation of fatty acid methyl esters for glc analyses and of various aryl esters for hplc analyses has traditionally been carried out in totally unrelated operations. This paper draws attention to the use of fatty acid – trifluoroacetic acid mixed anhydrides which may be directly and efficiently converted into either type of ester. The utility of the method was demonstrated by the preparation of a series of methyl, 2-naphthyl, and vanillin fatty acid esters. The spectral characterization of some aryl fatty acid esters is recorded.
Convergence Rates of Inexact Proximal-Gradient Methods for Convex Optimization (2011)

We consider the problem of optimizing the sum of a smooth convex function and a non-smooth convex function using proximal-gradient methods, where an error is present in the calculation of the gradient of the smooth term or in the proximity operator with respect to the non-smooth term. We show that both the basic proximal-gradient method and the accelerated proximal-gradient method achieve the same convergence rate as in the error-free case, provided that the errors decrease at appropriate rates.Using these rates, we perform as well as or better than a carefully chosen fixed error level on a set of structured sparsity problems.
Indoor Cooperative Localization for Ultra Wideband Wireless Sensor Networks (2008)

In recent years there has been growing interest in ad-hoc and wireless sensor networks (WSNs) for a variety of indoor applications. Localization information in these networks is an enabling technology and in some applications it is the main sought after parameter. The cooperative localization performance of WSNs is ultimately constrained by the behavior of the utilized ranging technology in dense cluttered indoor environments. Recently, ultra-wideband (UWB) Time-of-Arrival (TOA) based ranging has exhibited potential due to its large bandwidth and high time resolution. However, the performance of its ranging and cooperative localization capabilities in dense indoor multipath environments needs to be further investigated. Of main concern is the high probability of non-line of sight (NLOS) and Direct Path (DP) blockage between sensor nodes, which biases the TOA estimation and degrades the localization performance. In this dissertation, we first present the results of measurement and modeling of UWB TOA-based ranging in different indoor multipath environments. We provide detailed characterization of the spatial behavior of ranging, where we focus on the statistics of the ranging error in the presence and absence of the DP and evaluate the pathloss behavior in the former case which is important for indoor geolocation coverage characterization. Parameters of the ranging error probability distributions and pathloss models are provided for different environments: traditional office, modern office, residential and manufacturing floor; and different ranging scenarios: indoor-to-indoor (ITI), outdoor-to-indoor (OTI) and roof-to-indoor (RTI). Based on the developed empirical models of UWB TOA-based OTI and ITI ranging, we derive and analyze cooperative localization bounds for WSNs in the different indoor multipath environments. First, we highlight the need for cooperative localization in indoor applications. Then we provide comprehensive analysis of the factors affecting localization accuracy such as network and ranging model parameters. Finally we introduce a novel distributed cooperative localization algorithm for indoor WSNs. The Cooperative LOcalization with Quality of estimation (CLOQ) algorithm integrates and disseminates the quality of the TOA ranging and position information in order to improve the localization performance for the entire WSN. The algorithm has the ability to reduce the effects of the cluttered indoor environments by identifying and mitigating the associated ranging errors. In addition the information regarding the integrity of the position estimate is further incorporated in the iterative distributed localization process which further reduces error escalation in the network. The simulation results of CLOQ algorithm are then compared against the derived G-CRLB, which shows substantial improvements in the localization performance.
A Polyaniline with Near-Infrared Optical Response to Saccharides (1999)

A sugar-binding polymer film capable of continuous sensingarises from the copolymerization of aniline and 3-aminophenylboronic acid. Its absorption spectrum between 500 and 800 nm undergoes large changes on addition of various saccharides at neutral pH, changes which are dependent on the saccharide concentration and are fully reversible. These films represent an interesting alternative to enzyme-based glucose sensors because of their ease of preparation, compatibility with LED and diode laser light sources, and their thermal and temporal stability.
Retrofitting the IBM POWER Hypervisor to Support Mandatory Access Control (2007)

Server virtualization more readily enables the collocation of disparate workloads on a shared physical platform. When employed on systems across a data center, the result can be a dramatic increase in server utilization and a decrease in overall power, cooling and floor space requirements. However, in an environment where workloads share the underlying platforms, achieving other desirable workload goals, such as availability and security, becomes a challenge. In particular, enforcing isolation between workloads in a large, dynamic, and virtualized data center requires strong yet easily configurable controls on the sharing of resources at the virtualization layer. Commercial hypervisors usually offer reasonable isolation of individual virtual machines (VMs). However, on hypervisor-based platforms, one cannot currently define a single policy that automatically enforces restrictions on the sharing of resources between multiple VMs or request an air gap between workloads. In this paper, we describe the design and implementation of a Hypervisor-based Mandatory Access Control (MAC) that achieves policy-driven distributed workload isolation for the IBM Power Hypervisor (PHYP). We discuss our experiences and lessons learned and examine the implications and trade-offs involved in providing MAC on a production- level, commercially-available hypervisor. Our goal is to simplify the security management of data centers through centralized security management and policy- driven distributed access control and data protection.
Porous anatase TiO<sub>2</sub>constructed from a metal–organic framework for advanced lithium-ion battery anodes (2014)

Porous anatase TiO2 has been prepared, for the first time, through the calcination of a metal–organic framework (MOF) precursor under an air atmosphere at 380 °C. The resulting TiO2 has shown moderate porosity with a BET surface area of 220 m2 g−1 attributed to the highly porous structure of the MIL-125(Ti) precursor. The porous anatase TiO2 was examined as a lithium-ion battery anode, exhibiting high capacity retention and good rate capability. The porous structure of anatase TiO2 enforces Li+ diffusion and helps to buffer the volumetric variation. It has shown reversible capacities of 166, 106 and 71 mA h g−1 at 1 C, 5 C and 10 C charge/discharge rates, respectively, after 500 cycles.
Prediction of Metabolic Syndrome by Low Serum Testosterone Levels in Men (2009)

Low testosterone but not DHEAS predicts development of MetS in a population-based cohort of 1,004 men aged 20-79 years. Especially in young men aged 20-39 years, results suggest low testosterone as a strong predictor for incident MetS. Assessment of testosterone in young and middle-age men may allow early interventions in the general population.
Clean, flawless and thinner stainless steel valves by strip casting (2019)

Abstract Compressor valves are made of hardened and tempered martensitic stainless steels. They were first produced from ingot cast material. Later continuous casting technology largely replaced this process, which led to improved, more uniform, properties and higher yields in the production of hot strip. A further development was made around the turn of the millennium, when strip casting was first used for the production of stainless steel strip, directly from the melt. In this paper the steel grade Zapp 1.4028MO produced via both production routes: a) Continuous casting - hot rolling - cold rolling and b) Strip casting - cold rolling, are compared with respect to their microstructure evolution and static/dynamic mechanical properties. It is shown that strip cast material can not only substitute that of the traditional continuous casting route, but moreover deliver performance advantages with thin stainless steel valves used within air conditioning units and household refrigerators.
The split-cross-bridge resistor for measuring the sheet resistance, linewidth, and line spacing of conducting layers (1986)

A new test structure was developed for evaluating the line spacing between conductors on the same layer by using an electrical measurement technique. This compact structure can also be used to measure the sheet resistance, linewidth, and line pitch of the conducting layer. Using an integrated-circuit fabrication process, this structure was fabricated in diffused polycrystalline silicon and metal layers. These structures were measured optically and electrically, and these measured value were compared. For the techniques used, the optical measurements were typically one-quarter micrometer greater than the electrical measurements for the polysilicon and metal layers. Most electrically measured line pitch values were within 2 percent of the designed value. A small difference between the measured and designed line pitch is used to validate sheet resistance, linewidth, and line spacing values. Test results confirm the structure's self-checking feature based on the line pitch. That is, a small difference between the measured and designed line pitch is used to validate sheet resistance, linewidth, and line spacing values. Rules for designing the test structure are presented in detail.
WhoseFault: automatic developer-to-fault assignment through fault localization (2012)

This paper describes a new technique, which automatically selects the most appropriate developers for fixing the fault represented by a failing test case, and provides a diagnosis of where to look for the fault. This technique works by incorporating three key components: (1) fault localization to inform locations whose execution correlate with failure, (2) history mining to inform which developers edited each line of code and when, and (3) expertise assignment to map locations to developers. To our knowledge, the technique is the first to assign developers to execution failures, without the need for textual bug reports. We implement this technique in our tool, WhoseFault, and describe an experiment where we utilize a large, open-source project to determine the frequency in which our tool suggests an assignment to the actual developer who fixed the fault. Our results show that 81% of the time, WhoseFault produced the same developer that actually fixed the fault within the top three suggestions. We also show that our technique improved by a difference between 4% and 40% the results of a baseline technique. Finally, we explore the influence of each of the three components of our technique over its results, and compare our expertise algorithm against an existing expertise assessment technique and find that our algorithm provides greater accuracy, by up to 37%.
An improved combined symbol and sampling clock synchronization method for OFDM systems (2003)

In this paper, we present a delay-locked loop (DLL) technique for performing a combined symbol and sampling clock synchronization in orthogonal frequency division multiplexing (OFDM) systems. In addition, we propose a symbol timing acquisition algorithm for the DLL. It is shown that by using this combined scheme, we can achieve symbol timing recovery and sampling clock adjustment simultaneously. In particular, the symbol timing estimation error variance can be decreased by several orders of magnitude compared with the common correlation methods in both the AWGN and multipath fading channels.
Molecular Dynamics Simulation of Electrolyte Solutions in Ambient and Supercritical Water. 1. Ion Solvation (1996)

Free energies of solvation for Cl-, OH-, Na+, HCl, and H2O are calculated at ambient conditions and several supercritical water (SCW) states using molecular dynamics−free energy perturbation computer simulation. From ambient to SCW, the magnitude of reductions in the coordination number, number of hydrogen bonds, and other specific interactions are in the opposite order of the solute−water interaction energies, which are, from strongest to weakest, Na+ > OH- > Cl- > H2O > HCl. This trend also applies to the magnitude of the solvation free energy, although the changes for Na+ are very small, from ambient conditions all the way to 673 K and 0.087 g/cm3. Bivalent cations exhibit a well-defined second shell that remains at supercritical conditions. Modest discrepancies are observed between simulation and experiment both for the local density of water about Sr2+ and for the free energy of solvation of NaCl, illustrating the challenges to both theory and experiment.
A Knowledge Base for the Emerging Discipline of Computer Graphics (2015)

Computer Graphics is evolving as a discipline characterized by the fusion of artistic and technical theories and skills. The goal of the SIGGRAPH Curriculum Working Group has been to create a knowledge base that defines this discipline. This knowledge base is presented as a palette of subject areas and skills that forms the necessary educational framework for creation of undergraduate curricula that specialize in computer graphics. It facilitates the development of attributes that will create paths toward professional work, graduate studies, and lifelong skills-development and learning focused on computer graphics. The details provided here are principally oriented toward faculty members designing new computer graphics programs or those evolving existing ones. They also benefit students who wish to craft their own programs in computer graphics, as well as administrators and accreditors seeking guidance for framing and assessing these programs.
A web server for inferring the human <i>N</i>-acetyltransferase-2 (NAT2) enzymatic phenotype from <i>NAT2</i> genotype (2009)

Supplementary data are available at Bioinformatics online.
Surface rheology and interface stability. (2010)

We have developed a mature laboratory at Sandia to measure interfacial rheology, using a combination of home-built, commercially available, and customized commercial tools. An Interfacial Shear Rheometer (KSV ISR-400) was modified and the software improved to increase sensitivity and reliability. Another shear rheometer, a TA Instruments AR-G2, was equipped with a du Nouey ring, bicone geometry, and a double wall ring. These interfacial attachments were compared to each other and to the ISR. The best results with the AR-G2 were obtained with the du Nouey ring. A Micro-Interfacial Rheometer (MIR) was developed in house to obtain the much higher sensitivity given by a smaller probe. However, it was found to be difficult to apply this technique for highly elastic surfaces. Interfaces also exhibit dilatational rheology when the interface changes area, such as occurs when bubbles grow or shrink. To measure this rheological response we developed a Surface Dilatational Rheometer (SDR), in which changes in surface tension with surface area are measured during the oscillation of the volume of a pendant drop or bubble. All instruments were tested with various surfactant solutions to determine the limitations of each. In addition, foaming capability and foam stability were tested and compared with the rheology data. It was found that there was no clear correlation of surface rheology with foaming/defoaming with different types of surfactants, but, within a family of surfactants, rheology could predict the foam stability. Diffusion of surfactants to the interface and the behavior of polyelectrolytes were two subjects studied with the new equipment. Finally, surface rheological terms were added to a finite element Navier-Stokes solver and preliminary testing of the code completed. Recommendations for improved implementation were given. When completed we plan to use the computations to better interpret the experimental data and account for the effects of the underlying bulk fluid.
Development of a Controller Area Network Interface Unit and Its Application to a Fuel Cell Hybrid Electric Vehicle (2006)

In this paper, a CAN-based network interface unit is presented and it is applied to an experimental set-up for studying the timing analysis for the power train control of a fuel cell hybrid electric vehicle. Next generation vehicles like fuel cell electric vehicles usually require a lot of communication data between subsystems or ECUs to improve the fuel economy and the advanced safety. Unexpected transmission delay on a data bus may be a cause for an unstable operation of a vehicle which may also yield a serious result and thus, a simple method for varying controller sampling period is proposed based on holistic scheduling method. It is illustrated by applying the presented interface unit to the simple experimental set-up of a fuel cell hybrid electric vehicle that the transmission delay problem of a lower priority data, which results from the activation of a higher priority task, can be resolved
Magnetic Saturation in Synchronous Generator Dynamic Models for Power System Stability Studies (2019)

This article analyzes and compares the magnetic saturations of the synchronous generator dynamic models commonly used for power system stability studies. A simple saturation method suitable for both round-rotor and salient-pole synchronous generators is introduced and evaluated for high accuracy generator dynamic models. Feasibility of applying a single saturation factor to both d- and q-axis in determining the generator rotor angle is studied from field measurement data. The accuracy improvement of using saturated stator parameter to calculate rotor angle is demonstrated based on calculation and field measurement results on in-service round-rotor and salient-pole generators with a variety of capacities. The suitability of the saturation method for a proposed GENQSC model has been proved.
Structural health monitoring with piezoelectric wafer active sensors – predictive modeling and simulation (2010)

This paper starts a review of the state of the art in structural health monitoring with piezoelectric wafer active sensors and follows with highlighting the limitations of the current approaches which are predominantly experimental. Subsequently, the paper examines the needs for developing a predictive modeling methodology that would allow to perform extensive parameter studies to determine the sensing method's sensitivity to damage and insensitivity to confounding factors such as environmental changes, vibrations, and structural manufacturing variability. The thesis is made that such a predictive methodology should be multi-scale and multi-domain, thus encompassing the modeling of structure, sensors, electronics, and power management. A few examples of preliminary work on such a structural sensing predictive methodology are given. The paper ends with conclusions and suggestions for further work
Surface Modification of Diamonds in Diamond/Al-Matrix Composite (2008)

This DOI is not currently attached to any metadata records. DOIs can’t actually ever be deleted (they’re persistent), but sometimes our members create DOIs in error. We do have a process to approximate deletion which we follow only in rare cases where the DOI has been genuinely created in error, and most crucially, if the DOI has never been published anywhere online or in print and never otherwise distributed to or communicated with anyone (authors, readers, reviewers, etc.
Novel Pschorr reaction in the papaverine series (1973)

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNovel Pschorr reaction in the papaverine seriesMichael P. Cava, I. Noguchi, and K. T. BuckCite this: J. Org. Chem. 1973, 38, 13, 2394–2397Publication Date (Print):June 1, 1973Publication History Published online1 May 2002Published inissue 1 June 1973https://pubs.acs.org/doi/10.1021/jo00953a024https://doi.org/10.1021/jo00953a024research-articleACS PublicationsRequest reuse permissionsArticle Views217Altmetric-Citations26LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-Alertsclose Get e-Alerts
Analytical Techniques for Combinatorial Chemistry:  Quantitative Infrared Spectroscopic Measurements of Deuterium-Labeled Protecting Groups (1996)

Infrared microspectroscopy has been developed as a powerful, nondestructive technique for the quantitative analysis of solid-phase, resin-bound chemical reactions. The synthesis and/or application of deuterium isotope containing protecting groups, including acetyl-d3 chloride, benzoyl-d5 chloride, and 2-[[[(tert-butyl-d9)oxy]carbonyl]oximino]-2-phenylacetonitrile (BOC-ON-d9) are also introduced as highly selective infrared signatures amenable to quantitation by infrared spectroscopy. Calculation of first derivative carbon−deuterium (C−D) stretching absorbance relative to resin backbone derivative absorbances provided pathlength-independent quantitation of deuterium content and allowed for the determination of chemical yields in solid-phase resin reactions involving changes in deuterium content.