gebhart/patrepeval huggingface dataset:
WiFi can be the weakest link of round trip network latency in the wild (2016)

As mobile Internet is now indispensable in our daily lives, WiFi's latency performance has become critical to mobile applications' quality of experience. Unfortunately, WiFi hop latency in the wild remains largely unknown. In this paper, we first propose an effective approach to break down the round trip network latency. Then we provide the first systematic study on WiFi hop latency in the wild based on the latency and WiFi factors collected from 47 APs on T university campus for two months. We observe that WiFi hop can be the weakest link in the round trip network latency: more than 50% (10%) of TCP packets suffer from WiFi hop latency larger than 20ms (100ms), and WiFi hop latency occupies more than 60% in more than half of the round trip network latency. To help understand, troubleshoot, and optimize WiFi hop latency for WiFi APs in general, we train a decision tree model. Based on the model's output, we are able to reduce the median latency by 80% from 50ms to 10ms in one real case, and reduce the maximum latency from 250ms to 50ms in another real case.
Bullying Victimisation Among Deaf Adolescents: A School-Based Self-Report Survey in Ghana (2021)

Regional and national level data on bullying victimisation and its associated factors among deaf adolescents are still lacking, particularly, in Africa. We conducted a cross-sectional self-report anonymous survey involving a nationally representative random sample of 450 school-going deaf adolescents in Ghana. Bivariate and multivariate analyses of the data showed the overall 12-month prevalence estimate of bullying victimisation to be 55 · 1% (95% confidence interval [CI]: 50% – 60%), but the estimates were comparable between females (52 · 0%) and males (57 · 0%). Whereas deaf adolescents with schoolwork problems were likely to report bullying victimisation, most of the key factors associated with bullying victimisation were adverse social events – break-up, conflict with friends, and parental divorce. These findings underscore the need for further studies, and school-based intervention and prevention efforts.
THERMAL CONDUCTIVITY OF GASEOUS AMMONIA IN THE TEMPERATURE RANGE 358-925 K. (1981)

Thermal conductivity of research grade pure ammonia gas has been measured by the column method at pressures of 12.9, 26.5, and 45.0 kN/m2 over the temperature range 358 to 925 K. The maximum probable error of measurement is 1.5% at 874 K and it increases in magnitude as the temperature decreases. At 405 K, it is about 4.8%. The experimental data are correlated by the following cubic polynomial in temperature: k(T)=5.237× 10-3 + 5.179 × 10-4 T + 8.404 × 10-7 T2 + 1.557 × 10-10 T3. Here k is in mW/cm-K and T is in K. The experimental values are compared with three kinetic theory expressions for thermal conductivity of polyatomic gases in conjunction with the Stockmayer (12-6-3) potential. It is concluded that none of the theories can accurately predict the thermal conductivity of ammonia and probably of polar gases in general. The diffusion coefficient characterizing the transport of vibrational energy is computed as a function of temperature and on the basis of experimental data and the theory due to Ahtye. It has been long known that the transfer of energy by polyatomic and polar molecules is quite complex because of the presence of internal degrees of freedom and the possibility of resonant energy transfer in the latter (Hirschfelder, Curtiss and Bird, 1964).
Autonomous Navigation using SPA Concept (2012)

Autonomous navigation uses Sense Plan and Act (SPA) concept based on embedded technology. This is used for path finding in unsecured area. The main objective of this concept is to develop reactive navigation system that will make a tanker move autonomously to avoid obstacles. When IR sensor senses an obstacle, it passes the information to microcontroller. Then tanker starts to move in appropriate direction to avoiding the obstacles and sends the information to particular control room through GPS tracking system. The tanker can be used in front line during war for spying and fighting purpose. The tanker helps us to save the precious lives of our soldiers.
Fault-Tolerance for Communicating Multidatabase Transactions* (1994)

In this paper we propose a framework that can be used for the implementation of reliable multi database system communication protocols. The framework provides transactions on shared write-once objects, termed communication objects, that can be recovered after failures. Also concurrency is supported by recoverable processes. The realization of this framework that can be provided by means of a distributed coordination kernel, is the focus of this paper. Strategies for communication objects that belong to digerent reliability classes are presented. The application of this framework for MDBS transaction processing is shown and the failure behavior of a MDBS communication protocol supporting global serializability through a global two-phase-commit is discussed.
Polyvinylamine Boronate Adhesion to Cellulose Hydrogel (2006)

The adhesion of polyvinylamine to wet cellulose was significantly enhanced by the presence of pendant phenylboronic acid groups. It is proposed that adhesion results from boronate ester formation with cellulose at pH > 8. Experiments with phenol derivatized polyvinylamine gave low adhesion supporting the fact that the boronate moiety was responsible for strong adhesion to never-dried cellulose surfaces.
Total Synthesis of Bryostatin 1 (2010)

Bryostatin 1 is a marine natural product that is a very promising lead compound because of the potent biological activity it displays against a variety of human disease states. We describe herein the first total synthesis of this agent. The synthetic route adopted is a highly convergent one in which the preformed, heavily functionalized pyran rings A and C are united by "pyran annulation", the TMSOTf-promoted reaction between a hydroxyallylsilane appended to the A-ring fragment and an aldehyde contained in the C-ring fragment, with concomitant formation of the B ring. Further elaborations of the resulting very highly functionalized intermediate include macrolactonization and selective cleavage of just one of five ester linkages present.
Development of an Autonomous Omnidirectional Hazardous Material Handling Robot (2015)

This thesis describes the prototyping and testing of an autonomous omnidirectional robot, called the OmniMaxbot. The OmniMaxbot is designed to carry cans of uranium ash at Cameco Corporation's Port Hope Conversion Facility while minimizing worker exposure. The robot makes use of the Robot Operating System (ROS) to allow the individual components to communicate as well as control the movement. In the course of this work, the OmniMaxbot's power distribution system was redesigned. The software for much of the hardware was developed, in part or in whole, in order to ensure the safe autonomous functioning of the system. Due to the excessive wheel slip caused by the OmniMaxbot's Mecanum wheels, laser scan matching was implemented to generate odometry data, as opposed to using encoder data. Different Simultaneous Localization and Mapping (SLAM) and autonomous navigation packages were tested, with the ROS hector_mapping, global_planner, and base_local_planner packages being selected for use. Configuration settings were determined that produced the best performance results. A variety of tests were performed to ensure that individual hardware, subsystems, and the full system worked as required. The results showed that the OmniMaxbot is capable of autonomously navigating to a pick-up location, picking up a mock ash can, navigating to a drop-off location, putting the can down, and returning to a standby location, all in an area with dynamic and static obstacles, without collisions.
Molecular Evidence that the Extracellular Cutinase Pbc1 Is Required for Pathogenicity of <i>Pyrenopeziza brassicae</i> on Oilseed Rape (2003)

Recent evidence has suggested that cutinase is required for cuticular penetration and, therefore, is essential for pathogenicity of Pyrenopeziza brassicae, the causal organism of light leaf spot disease of oilseed rape and other brassicas. In order to acquire molecular evidence for the role of cutinase in pathogenesis, the single-copy P. brassicae cutinase gene Pbc1 was disrupted by a transformation-mediated approach. Southern hybridization analysis revealed that in one mutant, NH10-1224, the disruption was due to a tandem insertion of two copies of the disruption vector into the 5' coding region of Pbc1. In contrast to the wild type, no expression of Pbc1 was detected during in planta growth or in cutin-induced mycelium of NH10-1224 and no cutinase activity was detected in culture supernatants from NH10-1224 using p-nitrophenyl butyrate as substrate. Scanning electron microscopy of Brassica napus cotyledons infected with wild-type P. brassicae confirmed that entry into the host is by direct penetration of the cuticle. In contrast, the cutinase-deficient mutant NH10-1224 failed to penetrate the cuticular layer and was unable to develop disease symptoms. This evidence is consistent with the hypothesis that Pbc1 is required for P. brassicae to penetrate the plant cuticle. Demonstration that complementation of NH10-1224 with the Pbc1 wild-type gene restores both cutinase activity and pathogenicity will be required to definitively establish that cutinase is required for successful pathogenesis of brassicas by P. brassicae.
Efficient utilization of buffer storage in conservative staircase broadcasting scheme (2008)

The staircase scheme requires minimum buffer storage among all the broadcasting schemes that provides the video services. It however does not always deliver the video data to users in time. This problem has been overcome in the conservative staircase scheme, but the scheme requires more resources especially the buffer storage. In the conservative staircase scheme, the video is divided into segments depending upon the number of video channels allocated to it by the video server. The bandwidth of a video channel is equal to the viewing rate of the video. The segments are further divided into subsegments and the video channels into subchannels in such a way that a subchannel transmits all the subsegments of a single segment. In this paper, we propose a new mechanism for utilizing the buffer storage efficiently in the conservative staircase scheme. In the proposed scheme, the segments transmitted by each of the video channels are arranged in decreasing order of their indices. By doing this, the data of the segments can be delayed without failing their availability to the users in time. By delaying downloading of the data, only that data is stored in the buffer storage at the user's site that is needed immediately and in very near future. This scheme not only provides the video services using less storage space but also requires less disk transfer rate as compared to the conservative staircase scheme. Furthermore, the complexity of this scheme is much less than that of the conservative staircase scheme because it does not require the segments to be divided into subsegments and the video channels into subchannels <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1</sup> .
Some bygone operations in surgery (1930)

Journal Article Some bygone operations in surgery Get access D'Arcy Power D'Arcy Power K.B.E., London Search for other works by this author on: Oxford Academic Google Scholar British Journal of Surgery, Volume 18, Issue 69, July 1930, Pages 1–5, https://doi.org/10.1002/bjs.1800186902 Published: 06 December 2005
Interface Engineering: An Effective Approach toward High-Performance Organic Field-Effect Transistors (2009)

By virtue of their excellent solution processibility and flexibility, organic field-effect transistors (OFETs) are considered outstanding candidates for application in low-cost, flexible electronics. Not only does the performance of OFETs depend on the molecular properties of the organic semiconductors involved, but it is also dramatically affected by the nature of the interfaces present. Therefore, interface engineering, a novel approach towards high-performance OFETs, has attracted considerable attention. In this Account, we focus on recent advances in the study of OFET interfaces--including electrode/organic layer interfaces, dielectric/organic layer interfaces, and organic/organic layer interfaces--that have resulted in improved device performance, enhanced stability, and the realization of organic light-emitting transistors. The electrode/organic layer interface, one of the most important interfaces in OFETs, usually determines the carrier injection characteristics. Focusing on OFETs with copper and silver electrodes, we describe effective modification approaches of the electrode/organic layer interfaces. Furthermore, the influence of electrode morphology on device performance is demonstrated. These results provide novel approaches towards high-performance, low-cost OFETs. The dielectric/organic layer interface is a vital interface that dominates carrier transport; modification of this interface therefore offers a general way to improve carrier transport accordingly. The dielectric layer also affects the device stability of OFETs. For example, high-performance pentacene OFETs with excellent stability are obtained by the selection of a dielectric layer with an appropriate surface energy. The organic/organic layer interface is a newly investigated topic in OFETs. Introduction of organic/organic layer interfaces, such as heterojunctions, can improve device performance and afford ambipolar OFETs. By designing laterally arranged heterojunctions made of organic field-effect materials and light-emitting materials, we realized both light emission and field effects simultaneously in a single OFET. The preceding decade has seen great progress in OFETs. Interface engineering provides a simple but effective approach toward creating high-performance OFETs and will continue to make essential contributions in the development of useful OFET-based devices. The exploration of novel interface engineering applications also merits further attention; the design of gas sensors through a more complete understanding of interface phenomena serves as just one example.
An artificial neural networks for approximating polynomial functions (2003)

The authors use polynomial function as a common base to measure the capacity of a feedforward artificial neural network (FANN) with a finite number of hidden nodes. They show that there is a relationship between the capacity of a FANN in approximating polynomial functions and the number of hidden nodes used in the FANN. A procedure for realizing a FANN in approximating polynomial functions is described. Two examples are given to show the procedure. Several experiments are reported, verifying that a FANN with a certain number of hidden nodes has the capability to learn a given polynomial function. The experiments also showed that the proposed algorithm for training a FANN performs accurately.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
Irsogladine is a potent inhibitor of angiogenesis (1993)

We describe a novel inhibitor of angiogenesis, Irsogladine, an anti-ulcer drug. Irsogladine inhibited plasminogen activator synthesis of, and tube formation by, human microvascular endothelial cells in type 1 collagen gel treated with an angiogenic growth factor, EGF. Furthermore, Irsogladine administered orally significantly inhibited in vivo angiogenesis in mice. Irsogladine may be useful in the treatment of diseases associated with angiogenesis.
ITQ-12:  A Zeolite Having Temperature Dependent Adsorption Selectivity and Potential for Propene Separation (2004)

A study of the adsorption properties of the new, 8-ring, pure silica zeolite ITQ-12 at several temperatures reveals that it has unique, temperature dependent adsorption selectivity and high potential for the separation of propene from propene/propane mixtures. At 30 °C, propene is adsorbed more than 100 times faster than propane, forming the basis for a kinetic based separation. Unexpectedly, at 80 °C, little or no propane adsorption is observed whereas there is no evidence for any unusual decrease in propene adsorption, a property adding to the potential of this zeolite for propene separation. A small, temperature induced decrease in the minimum dimension of the ITQ-12's “slit shaped” cages is proposed as the reason for the loss of sorption capacity for the slightly larger propane molecules. ITQ-12's unique, temperature-dependent property gives rise to a sorption selectivity that is thermodynamically driven rather than the result of diffusion barriers. Preliminary PSA simulations indicate 99.5% purity propene can be achieved with productivity significantly larger than that reported for the aluminophosphate based zeolite, AlPO-14.
Signature of Superfluid Density in the Single-Particle Excitation Spectrum of Bi <sub>2</sub> Sr <sub>2</sub> CaCu <sub>2</sub> O <sub>8+δ</sub> (2000)

We report that the doping and temperature dependence of photoemission spectra near the Brillouin zone boundary of Bi(2)Sr(2)CaCu(2)O(8+delta)exhibit unexpected sensitivity to the superfluid density. In the superconducting state, the photoemission peak intensity as a function of doping scales with the superfluid density and the condensation energy. As a function of temperature, the peak intensity shows an abrupt behavior near the superconducting phase transition temperature where phase coherence sets in, rather than near the temperature where the gap opens. This anomalous manifestation of collective effects in single-particle spectroscopy raises important questions concerning the mechanism of high-temperature superconductivity.
A multidatabase system implementation on CORBA (2002)

METU Interoperable DBMS (MIND) is a multidatabase system based on OMG's distributed object management architecture. It is implemented on top of a CORBA compliant ORB, namely, DEC's ObjectBroker. In MIND, all local databases are encapsulated in a generic database object. The interface of the generic database object is defined in CORBA IDL and multiple implementations of this interface, one for each component DBMS, namely Sybase, Adabas D and MOOD are provided. MIND provides its users with a common data model and a single global query language based on SQL. The main components of MIND are a global query manager, a global transaction manager, a schema integrator, interfaces to supported database systems and a graphical user interface. The integration of export schemas is currently performed by using an object definition language (ODL) which is based on OMG's interface definition language. MIND global query optimizer aims at maximizing the parallel execution of the intersite operations of the global subqueries. Through the MIND global transaction manager, the serializable execution of the global transactions (both nested and flat) is provided.
Linearized Mach-Zehnder intensity modulator (2003)

A novel configuration of electrooptic intensity modulator based on a Mach-Zehnder interferometer with ring resonators coupled to each arm is proposed and analyzed theoretically. It is shown that this configuration offers a large improvement in modulation linearity with no requirements for complicated and precise electrical control.
Static and dynamic aspects of spin tunnelling in crystalline magnetic tunnel junctions (2006)

International audience
Precisely Defined Protein–Polymer Conjugates: Construction of Synthetic DNA Binding Domains on Proteins by Using Multivalent Dendrons (2007)

Nature has evolved proteins and enzymes to carry out a wide range of sophisticated tasks. Proteins modified with functional polymers possess many desirable physical and chemical properties and have applications in nanobiotechnology. Here we describe multivalent Newkome-type polyamine dendrons that function as synthetic DNA binding domains, which can be conjugated with proteins. These polyamine dendrons employ naturally occurring spermine surface groups to bind DNA with high affinity and are attached onto protein surfaces in a site-specific manner to yield well-defined one-to-one protein-polymer conjugates, where the number of dendrons and their attachment site on the protein surface are precisely known. This precise structure is achieved by using N-maleimido-core dendrons that selectively react via 1,4-conjugate addition with a single free thiol group on the protein surface--either Cys-34 of bovine serum albumin (BSA) or a genetically engineered cysteine mutant of Class II hydrophobin (HFBI). This reaction can be conducted in mild aqueous solutions (pH 7.2-7.4) and at ambient temperature, resulting in BSA- and HFBI-dendron conjugates. The protein-dendron conjugates constitute a specific biosynthetic diblock copolymer and bind DNA with high affinity, as shown by ethidium bromide displacement assay. Importantly, even the low-molecular-weight first-generation polyamine dendron (1 kDa) can bind a large BSA protein (66.4 kDa) to DNA with relatively good affinity. Preliminary gene transfection, cytotoxicity, and self-assembly studies establish the relevance of this methodology for in vitro applications, such as gene therapy and surface patterning. These results encourage further developments in protein-dendron block copolymer-like conjugates and will allow the advance of functional biomimetic nanoscale materials.
A model of the Temkin isotherm behavior for hydrogen adsorption at Pd–SiO2 interfaces (1997)

A simple electrostatic model of the adsorbate–adsorbate interaction of hydrogen atoms at a Pd–SiO2 interface is presented. The model predicts a hydrogen adsorption isotherm of the Temkin type. It is found that, in practice, an upper limit for the hydrogen response of a Pd-metal-oxide-semiconductor device exists. The value (in V) is equal to the difference of the initial heats of adsorption (in eV) of the interface and the Pd bulk, respectively. Furthermore, a corresponding maximum hydrogen concentration, at the interface, of 1×1018 m−2 is predicted. The predictions are in good agreement with previously observed experimental data.
Asymmetric, Stereocontrolled Total Synthesis of Paraherquamide A (2003)

The first total synthesis of paraherquamide A, a potent anthelmintic agent isolated from various Penicillium sp. with promising activity against drug-resistant intestinal parasites, is reported. Key steps in this asymmetric, stereocontrolled total synthesis include a new enantioselective synthesis of alpha-alkylated-beta-hydroxyproline derivatives to access the substituted proline nucleus and a highly diastereoselective intramolecular S(N)2' cyclization to generate the core bicyclo[2.2.2]diazaoctane ring system.
Methaemoglobinaemia Resulting from Heterozygosity for Two NADH‐Methaemoglobin Reductase Variants: Characterization as NADH‐Ferricyanide Reductase (1981)

A case of congenital methaemoglobinaemia was found to result from heterozygosity for two different forms of NADH-methaemoglobin reductase (NADH-MR) deficiency. One of these variant forms was found to be electrophoretically fast, and to have sufficient residual activities to allow detailed characterization. This variant was characterized by its NADH-ferricyanide reductase activity, and was found to have a normal pH optimum and normal affinity for K3Fe(CN)6, NADH and deamino NADH. The diminished activity associated with this variant appeared to result from its decreased stability. It is suggested that the NADH-ferricyanide reductase activity of NADH-MR provides a convenient and standardized procedure for the characterization of NADH-MR.