gebhart/patrepeval huggingface dataset:
Molecular dynamics simulation study of solvent effects on conformation and dynamics of polyethylene oxide and polypropylene oxide chains in water and in common organic solvents (2012)

In this paper, the conformation and dynamics properties of polyethylene oxide (PEO) and polypropylene oxide (PPO) polymer chains at 298 K have been studied in the melt and at infinite dilution condition in water, methanol, chloroform, carbon tetrachloride, and n-heptane using molecular dynamics simulations. The calculated density of PEO melt with chain lengths of n = 2, 3, 4, 5 and, for PPO, n = 7 are in good agreement with the available experimental data. The conformational properties of PEO and PPO show an increasing gauche preference for the O-C-C-O dihedral in the following order water>methanol>chloroform>carbon tetrachloride = n-heptane. On the contrary, the preference for trans conformation has a maximum in carbon tetrachloride and n-heptane followed in the order by chloroform, methanol, and water. The PEO conformational preferences are in qualitative agreement with results of NMR studies. PEO chains formed different types of hydrogen bonds with polar solvent molecules. In particular, the occurrence of bifurcated hydrogen bonding in chloroform was also observed. Radii of gyration of PEO chains of length larger than n = 9 monomers showed a good agreement with light scattering data in water and in methanol. For the shorter chains the observed deviations are probably due to the enhanced hydrophobic effects caused by the terminal methyl groups. For PEO the fitting of end-to-end distance distributions with the semi-flexible chain model at 298 K provided persistence lengths of 0.375 and 0.387 nm in water and methanol, respectively. Finally, the radius of gyration of Pluronic P85 turned out to be 2.25 ± 0.4 nm at 293 K in water in agreement with experimental data.
Supervivencias de las instituciones Muiscas: El resguardo de Cota (Cundinamarca) (1987)

Mediante el estudio de la situaci6n actual y los antecedentes históricos de un resguardo indígena localizado en el municipio de Cota, Cundinamarea, se buscan los hilos conductores por medio de los cuales explicar la razón de su supervivencia en una época tardía, dentro de un contexto socio-económico de acelerado desarrollo capitalista y dentro de una de las principales áreas de transformaci6n demográfica y cultural del país desde principios de la Colonia: la sabana de Bogotá.
The Singlet–Triplet Exchange Energy in Conjugated Polymers (2004)

Abstract Electron–electron interactions in organic semiconductors split the lowest singlet and triplet states by the exchange energy, Δ E ST . Measurement of singlet and triplet emission spectra in a large number of conjugated polymers yield an almost constant Δ E ST value close to 0.7 eV. This is in contrast to the situation in molecules, where the exchange energy is found to depend on molecular size and to vary over a wide range. Quantum‐chemical calculations are performed to address the origin of the constant exchange energy in phenylene‐based conjugated polymers. The electron–hole separation in the lowest singlet and triplet excited states is found to be independent of the π‐conjugated backbone, and saturates for chains longer than a few repeating units, resulting in a constant exchange energy. In shorter conjugated oligomers, confinement of the excitations destabilizes the singlet with respect to the triplet through exchange interactions and leads to a larger and size‐dependent singlet–triplet energy separation.
Mining social networks of open source CVE coordination (2017)

Coordination is one central tenet of software engineering practices and processes. In terms of software vulnerabilities, coordination is particularly evident in the processes used for obtaining Common Vulnerabilities and Exposures (CVEs) identifiers for discovered and disclosed vulnerabilities. As the central CVE tracking infrastructure maintained by the non-profit MITRE Corporation has recently been criticized for time delays in CVE assignment, almost an ideal case is available for studying software and security engineering coordination practices with practical relevance. Given this pragmatic motivation, this paper examines open source CVE coordination that occurs on the public oss-security mailing list. By combining social network analysis with a data-driven, exploratory research approach, the paper asks six data mining questions with practical relevance. By contemplating about answers to the questions asked by means of descriptive statistics, the paper consequently contributes not only to the contemporary industry debates, but also to the tradition of empirical vulnerability research. The perspective and the case are both novel in this tradition, thus opening new avenues for further empirical inquiries and practical improvements for the contemporary CVE coordination.
Optical fiber V-groove transversal filter (1983)

A novel single mode optical fiber tapped delay line that uses silicon V-groove substrates to align an array of directional coupler taps has been demonstrated as a transversal filter. The device was used to generate and correlate 4-bit, 400-Mb/s coded sequences. The generated codes exhibited an amplitude uniformity of ±0.04 dB. The electrical correlation output was linear over a range of 25 dB and was limited by electronic components external to the fiber filter itself. Extension of the fabrication technique to include hundreds of taps at intervals as short as several picoseconds may be possible.
A Comparative Study between α-TCP and Si-α-TCP Calcium Phosphate Cement (2008)

On this study the influence of silicon dopping on the properties of the final calcium phosphate cement were analysed and compared to the ones of the conventional Si and Mg-free α-TCP cement. In spite of silicon doping, Si-α-TCP calcination temperature (1400°C) was higher than the one used for conventional α-TCP (1300°C) as a result of Mg contamination on the commercial precursor used on the Si-α-TCP synthesis. Because of the high temperature used, Si-α-TCP sample was difficult to mill. Even after 1 week milling, the particle size achieved was 12µm while Si-free α-TCP reached 7.7µm. Consequently, the reactivity of both powders was different. In conclusion, the properties of Si-α-TCP cement were not satisfactory for clinical application. In order to do it so, it is essential to enhance the powder reactivity by reducing Mg contamination, lowering the sintering temperature and reducing the particle size to, then, achieve the desired reactivity and compressive strength.
Generation of femtosecond soliton pulses by passive mode locking of an ytterbium-erbium figure-of-eight fiber laser (1993)

250-fs pulses have been generated directly from a passively mode-locked ytterbium–erbium figure-of-eight laser. In addition to the usual characteristic of one pulse per round trip, the laser could be made to produce regular pulse bursts at the round-trip frequency, with repetition rates in excess of 300 GHz.
TPK1 Is a Vacuolar Ion Channel Different from the Slow-Vacuolar Cation Channel (2005)

TPK1 (formerly KCO1) is the founding member of the family of two-pore domain K(+) channels in Arabidopsis (Arabidopsis thaliana), which originally was described following expression in Sf9 insect cells as a Ca(2+)- and voltage-dependent outwardly rectifying plasma membrane K(+) channel. In plants, this channel has been shown by green fluorescent protein fusion to localize to the vacuolar membrane, which led to speculations that the TPK1 gene product would be a component of the nonselective, Ca(2+) and voltage-dependent slow-vacuolar (SV) cation channel found in many plants species. Using yeast (Saccharomyces cerevisiae) as an expression system for TPK1, we show functional expression of the channel in the vacuolar membrane. In isolated vacuoles of yeast yvc1 disruption mutants, the TPK1 gene product shows ion channel activity with some characteristics very similar to the SV-type channel. The open channel conductance of TPK1 in symmetrically 100 mM KCl is slightly asymmetric with roughly 40 pS at positive membrane voltages and 75 pS at negative voltages. Similar to the SV-type channel, TPK1 is activated by cytosolic Ca(2+), requiring micromolar concentration for activation. However, in contrast to the SV-type channel, TPK1 exhibits strong selectivity for K(+) over Na(+), and its activity turned out to be independent of the membrane voltage over the range of +/-80 mV. Our data clearly demonstrate that TPK1 is a voltage-independent, Ca(2+)-activated, K(+)-selective ion channel in the vacuolar membrane that does not mediate SV-type ionic currents.
MUI-suppression with reduced T-equalizer for UTRA FDD downlink (2005)

Wideband CDMA systems with orthogonal spreading codes suffer severely due to the loss of orthogonality by multipath propagation. This yields multiple user interference (MUI), which gravely reduces the performance of classical systems with RAKE-receivers. We attempt to restore orthogonality by using a modified T-equalizer. Classical T-equalizers are composed as FIR filters with equidistant delays and appropriate coefficients. Their main disadvantage is the high computational effort due to the large number of coefficients. The question arises whether we need to calculate all equally spaced coefficients, or if some of the coefficients can be neglected. Basically, we use only a subset of coefficients and set all others to zero. The main advantages are the reduced computational effort in calculating the filter and the decreased computational costs in using it. We show the feasibility with some simulation results for block fading channels. In practice, a T-equalizer is not very often used for time variant channels, due to its high computational costs. Instead, an adaptive algorithm is taken and modified accordingly. We take a least mean squares (LMS) algorithm for MUI-suppression in a time variant environment. In order to show the feasibility of this approach, some simulation results for channels with low Doppler frequency are presented and compared with the classical RAKE-receiver and a full version of the LMS/Griffith by M.J. Heikkila (see Proc. IEEE Int. Symp. on Personal, Indoor and Mobile Radio Commun., PIMRC, 2001).
Semantically similar visual words discovery to facilitate visual invariance (2010)

A major limitation of many image classification and retrieval systems is that they only rely on the visual structure within images. However, images that have a different visual appearance may be semantically related at a higher level conceptualization. This paper presents a framework to deal with this problem by exploiting the well-known bag-of-visual words (BVW) model, to represent visual content. There are two key contributions of this paper. First, a novel approach for visual words construction is presented which takes the spatial information of keypoints into account in order to enhance the quality of visual words generated from extracted keypoints. Second, an approach to discover semantically similar visual word sets is proposed, which enables the BVW model to become invariant to certain changes in visual appearance. Consequently, the BVW model strengthens the discrimination power for visual content classification.
Losses Due to Stray Inductance in Switch Mode Converters (1996)

A tutorial paper is presented on the influence of stray inductance of the commutation circuit (Lσ) in switch mode converters. After a short explanation of turn-on and turn-off transients the discussion is focused on the dissipation losses of the switch (or clamping circuit) caused by stray inductance (Lσ). A simple measurement of Lσ is introduced which is based on switching transients. With this method Lσ can be calculated with a standard deviation of 4%. Then dissipation losses due to Lσ are estimated for a 50 kW buck converter and for a 50 W flyback converter. Due to low inductive circuit layout in non-isolated high power converters the additional losses are less than 5 % of the switching losses. However, isolated switch mode power supplies have a stray inductance which is approximately two orders of magnitude higher than in non-isolated converters. This requires clamping circuits which reduce overvoltage and absorb or feed back energy to the intermediate capacitor. In that case, losses caused by Lσ amount 10 ... 20 % of the switching losses.
On fundamental bifurcations from a hysteresis hyperchaos generator (1994)

In this paper we discuss a four-dimensional autonomous circuit which includes one hysteresis element. This circuit is governed by two symmetric three dimensional linear equations which are connected to each other by hysteresis switchings. Then we can derive the two-dimensional return map and show the following novel results: 1) Fundamental bifurcation diagram from periodic attractor to hyperchaos. It includes coexistence of torus and periodic attractor; 2) two-parameters bifurcation diagram. It exhibits some regularities for the onset of some periodic attractors and tori; 3) laboratory measurements of the return map attractors; 4) a sufficient condition for the existence of attractors.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
Mediation in the Modern Millennium (2002)

In Australia we call it "Mediation", the French say "la mediation", and the Germans "die Mediation". The term is global, stemming from the Latin, mediatio'; the process universal, its inherent flexibility transcending historical and national legal norms and systemic differences. Indeed, forms of mediation can be traced back to sources in ancient Greece, the Bible, traditional communities in Asia and Africa, and to the fourteenth Century English 'Mediators of Questions'. Mediation, however, does not exist in a vacuum. It operates against a backdrop of national dispute management culture and institutional rules and regulations. Accordingly, it is nothing less than misleading to consider mediation as a universal process in isolation. Context determines how mediation is absorbed and applied by mediators, dispute managements professionals such as lawyers, and by clients. Context defines mediation and has a direct impact on how it is practised. National legal contexts reveal historically embedded systemic differences that can provide insights into the reasons behind the rapid expansion of mediation in common law jurisdictions, and the comparatively hesitant development of mediation in civil law jurisdictions. In this paper I consider the systemic patterns and trends in the mediation movements of common law and civil law jurisdictions, namely, Australia, Austria, Belgium, Canada, Denmark, England, Germany, the Netherlands, Scotland, South Africa, Switzerland, U.S.A. and Yugoslavia. The ideas and concepts introduced in this paper are drawn from the wealth of data and critical analysis contained in the collection of national reports on mediation presented to the XVIth Congress of the International Academy of Comparative Law at The University of Queensland, Brisbane in July 2002. Accordingly, it is not the aim of this essay to describe or summarise the role of mediation in each of the aforementioned countries. This task has been undertaken with a great deal more expertise than I could claim by the national rapporteurs in their submissions to the Congress. Their national reports are due to be published by the Otto-Schmidt Verlag in Germany in late 2002.
Anticancer activity of methoxymorpholinyl doxorubicin (PNU 152243) on human hepatocellular carcinoma (2004)

Methoxymorpholinyl doxorubicin (PNU 152243) is a morpholinyl analog possessing a methoxymorpholinyl group at the 3' position of the sugar moiety, which, compared with doxorubicin, appears to be less cardiotoxic and more cytotoxic against multidrug-resistant tumor cells. In this study, we report the anticancer activity of PNU 152243 on human hepatocellular carcinoma (HCC) in vitro and in vivo. The average IC50 value of PNU was 0.08 microM. In contrast, the average IC50 values of adriamycin (ADM), 4'-epidoxorubicin (EDR), mitomycin C (MMC), cisplatin and vepesid (VP-16) were 0.96, 0.74, 2.81, 7.27 and 26.66 microM, respectively. PNU 152243 was 13.7, 10.6, 40.1, 103.8 and 380.8 times more potent than ADM, EDR, MMC, cisplatin and VP-16 against HCC in vitro. In nude mice, the T/C (%) were 43.8 at the dose of 25 microg/kg and 41.2 at the dose of 50 microg/kg on BEL-7402 xenograft, the T/C (%) were 41.7 at the dose of 25 microg/kg and 54.6 at the dose of 50 microg/kg on Zip-177 xenograft. The results showed that PNU 152243 had growth inhibition of HCC in vitro and in vivo and may be useful in HCC chemotherapy.
Boiler flame monitoring systems for low NO{sub x} applications -- An update (1997)

During the past few years the power industry has replaced or upgraded numerous coal, oil, and gas burners in many plants to meet the 1990 Clean Air Act Amendment (CAAA) NO{sub x} emission standards. This paper discusses the boiler flame monitoring system, technologies, design features, and specifications that are available to meet the challenges of low NO{sub x} firing. In the next few years many additional burner modifications or replacements are expected as emissions limits are lowered further. This paper should help identify many issues that will need to be carefully addressed for future successful applications of boiler flame monitoring systems.
Predicting Future Resource Requirement for Efficient Resource Management in Cloud (2014)

Cloud Computing became an optimal solution for business customers to maintain and promote their business needs to clients via cloud services like IaaS, SaaS, and PaaS. On-Demand and pay-per-use scale up methodologies attracted organizations for cloud adoption and migration. Due to the increased demand for cloud services from users, Efficient Resource Management in cloud computing become an important task. In order to achieve resource multiplexing in cloud computing, recent researches were introduced dynamic resource allocation through virtual machines. Existing dynamic approaches followed un-evenness procedures to allocate the available resources based on current workload of systems. Unexpected demand for huge amount of resources in future may cause allocation failure or system hang problem. In this paper we present a new systematic approach to predict the future resource demands of cloud from past usage. This approach analyzes the resource allocation logs of virtual server, SLA agreements and follows the resource prediction algorithm to estimate future needs to avoid allocation failure problem in cloud resource management. Experimental results are supporting our strategy is more scalable and reliable than existing approaches.
An intermediate language for system engineering (2002)

An intermediate language (Alfonse: A Language For the New System Engineering) which formally expresses the operations of system engineering has been developed. Alfonse has been implemented in a personal computer environment and used to bridge the gap between human interface aspects of system engineering tools and their operational and data management aspects. This approach greatly increases the possibility of tool interoperability, with the consequential potential for large increases in system engineering productivity.
A Critical Review of the Cholesterolaemic Effects of Palm Oil (1994)

This paper reviews recent reports of the cholesterolaemic effects of palm oil. The evidence indicates that the substitution of palm oil or its lipid fractions for the usual fats in the diet does not result in an elevation of total serum cholesterol in lean, normocholesterolaemic individuals with a cholesterol intake of less than 300 mg per day. When threshold dietary levels of linoleic acid (18:2) are met, they tend to counter the cholesterol-raising effects of the 12- and 16-carbon saturated fatty acids. In view of this, the use of a cholesterol saturated-fat index to measure the hypercholesterolaemic and atherogenic potential of foods can be misleading, particularly when applied to palm oil. Nutritionists and health professionals need to keep abreast of recent knowledge on the cholesterolaemic impact of dietary fats and fatty acids.
Towards more realistic sound in VRML (1998)

Article Free Access Share on Towards more realistic sound in VRML Author: Sean Ellis Superscape VR plc., Cromwell House, Bartley Wood, Hook, Hants RG27 9XA, England Superscape VR plc., Cromwell House, Bartley Wood, Hook, Hants RG27 9XA, EnglandView Profile Authors Info & Claims VRML '98: Proceedings of the third symposium on Virtual reality modeling languageFebruary 1998 Pages 95–100https://doi.org/10.1145/271897.279545Published:01 February 1998Publication History 2citation322DownloadsMetricsTotal Citations2Total Downloads322Last 12 Months2Last 6 weeks0 Get Citation AlertsNew Citation Alert added!This alert has been successfully added and will be sent to:You will be notified whenever a record that you have chosen has been cited.To manage your alert preferences, click on the button below.Manage my AlertsNew Citation Alert!Please log in to your account Save to BinderSave to BinderCreate a New BinderNameCancelCreateExport CitationPublisher SiteeReaderPDF
An empirical study of testing and integration strategies using artificial software systems (1993)

There has been much discussion about the merits of various testing and integration strategies. Top-down, bottom-up, big-bang, and sandwich integration strategies are advocated by various authors. Also, some authors insist that modules be unit tested, while others believe that unit testing diverts resources from more effective verification processes. This article addresses the ability of the aforementioned integration strategies to detect defects, and produce reliable systems. It also explores the efficacy of spot unit testing, and compares phased and incremental versions of top-down and bottom-up integration strategies. Relatively large artificial software systems were constructed using a code generator with ten basic module templates. These systems were seeded with known defects and tested using the above testing and integration strategies. A number of experiments were then conducted using a simulator whose validity was established by comparing results against these artificial systems. The defect detection ability and resulting system reliability were measured for each strategy. Results indicated that top-down integration strategies are generally most effective in terms of defect correction. Top-down and big-bang strategies produced the most reliable systems. Results favored neither those strategies that incorporate spot unit testing nor those that do not; also, results favored neither phased nor incremental strategies.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
Access control mechanisms for a network operating system (1979)

The growing recognition of the need for computer system security has resulted in the design, development and installation of "patches," packages and even new operating systems intended to provide higher degrees of data and systems protection. With the increased utilization of computer networks and current developments in the area of network operating systems (NOSs) 40 , 19 , 30 the requirements for security in networking environments are also coming under investigation. 26 , 42 While research and development are still ongoing in the NOS area, it is vital to ensure that requirements for the security and integrity of data are well specified and that mechanisms for achieving the needed levels of systems protection are included in the design of the NOS. This will ensure that subsequent production versions of NOSs incorporate such mechanisms—thus, charting a course away from the otherwise inevitable "retrofit security" situation.