gebhart/patrepeval huggingface dataset:
Quality assurance in e-learning: PDPP evaluation model and its application (2012)

<p>E-learning has become an increasingly important teaching and learning mode in educational institutions and corporate training. The evaluation of e-learning, however, is essential for the quality assurance of e-learning courses. This paper constructs a four-phase evaluation model for e-learning courses, which includes planning, development, process, and product evaluation, called the PDPP evaluation model. Planning evaluation includes market demand, feasibility, target student group, course objectives, and finance. Development evaluation includes instructional design, course material design, course Web site design, flexibility, student-student interaction, teacher/tutor support, technical support, and assessment. Process evaluation includes technical support, Web site utilization, learning interaction, learning evaluation, learning support, and flexibility. Product evaluation includes student satisfaction, teaching effectiveness, learning effectiveness, and sustainability. Using the PDPP model as a research framework, a purely e-learning course on Research Methods in Distance Education, developed by the School of Professional and Continuing Education at the University of Hong Kong (HKU SPACE) and jointly offered with the School of Distance Learning for Medical Education of Peking University (SDLME, PKU) was used as a case study. Sixty students from mainland China, Hong Kong, Macau, and Malaysia were recruited for this course. According to summative evaluation through a student e-learning experience survey, the majority of students were very satisfied/satisfied on all e-learning dimensions of this course. The majority of students thought that the learning effectiveness of this course was equivalent, even better, than face-to-face learning because of cross-border collaborative learning, student-centred learning, sufficient learning support, and learning flexibility. This study shows that a high quality of teaching and learning might be assured by using the systematic PDPP evaluation procedure. It is hoped that the PDPP evaluation model and its application can provide a benchmark for establishing a wider e-learning quality assurance mechanism in educational institutions.</p><input id="gwProxy" type="hidden" /><input id="jsProxy" onclick="if(typeof(jsCall)=='function'){jsCall();}else{setTimeout('jsCall()',500);}" type="hidden" /><input id="gwProxy" type="hidden" /><input id="jsProxy" onclick="if(typeof(jsCall)=='function'){jsCall();}else{setTimeout('jsCall()',500);}" type="hidden" />
The number needed to treat: a clinically useful measure of treatment effect (1995)

The relative benefit of an active treatment over a control is usually expressed as the relative risk, the relative risk reduction, or the odds ratio. These measures are used extensively in both clinical and epidemiological investigations. For clinical decision making, however, it is more meaningful to use the measure "number needed to treat." This measure is calculated on the inverse of the absolute risk reduction. It has the advantage that it conveys both statistical and clinical significance to the doctor. Furthermore, it can be used to extrapolate published findings to a patient at an arbitrary specified baseline risk when the relative risk reduction associated with treatment is constant for all levels of risk.
Cloning and characterization of a cDNA encoding a maize seedling phytase (1997)

During germination, maize seedlings express a phytase able to hydrolyse the large amount of phytin stored in the dry seed. Previous studies allowed purification and characterization of this enzyme as a homodimer of 38 kDa subunits [Laboure, Gagnon and Lescure, Biochem. J. (1993) 295, 413-419]. In the present work, an antibody against the purified maize phytase has been used to screen a maize seedling cDNA expression library. Several positive clones containing an insert of about 1400 bp were isolated. The nucleotide sequence of the insert of one of these clones has been established. This cDNA, called phy S11, was 1335 bp long and contained an open reading frame of 387 amino acids. The sequence of N-terminal residues (23 amino acids) of the purified phytase has been established. These residues are found at positions 19-41 of the amino acid sequence encoded by phy S11. This confirms that this cDNA codes for the maize phytase. The deduced amino acid sequence appears to be very different from those of published Aspergillus niger phytases; however, an homologous region of 33 amino acids was detected. This region of the fungal sequence contains the RHGxRxP consensus motif found in various high molecular mass acid phosphatases and believed to be the acceptor site for phosphate. Expression of the phy S11 cDNA in Escherichia coli allowed the production of the phytase subunit and its assembly to give a protein of the same size as the native phytase. The time course of phy S11 mRNA accumulation during germination showed that no transcript was present in dry seeds. The mRNA accumulated during the first day of germination, to reach a maximum after 2 days (radicle protrusion), and then decreased in young seedlings. Genomic Southern blot analyses suggest the existence of at least two genes and genetic mapping reveals two loci separated by 1 cM on chromosome 3 of maize. The cloning of this first cDNA coding for a plant phytase, will allow the isolation of the corresponding genes and the study of their regulation during germination.
A New Quaternary Structure Epitope on Dengue Virus Serotype 2 Is the Target of Durable Type-Specific Neutralizing Antibodies (2015)

Dengue virus causes fever and dengue hemorrhagic fever. Dengue serotype 2 (DENV2) is widespread and frequently responsible for severe epidemics. Natural DENV2 infections stimulate serotype-specific neutralizing antibodies, but a leading DENV vaccine did not induce a similar protective response. While groups have identified epitopes of single monoclonal antibodies (MAbs), the molecular basis of DENV2 neutralization by polyclonal human immune sera is unknown. Using a recombinant DENV displaying serotype 2 epitopes, here we map the main target of DENV2 polyclonal neutralizing antibodies induced by natural infection and a live DENV2 vaccine candidate. Proper display of the epitope required the assembly of viral envelope proteins into higher-order structures present on intact virions. Despite the complexity of the epitope, it was possible to transplant the epitope between DENV serotypes. Our findings have immediate implications for evaluating dengue vaccines in the pipeline as well as designing next-generation vaccines.
THE PHYSICAL AND PSYCHOLOGICAL MAXILLOFACIAL TRAUMA PATIENTS (1999)

The aim of this research is to study how the physical changes in the maxillofacial trauma patients affect them psychologically in patients of different ages, sexes, races, socioeconomic backgrounds, types and severity of injury. The study was conducted by doing a questionnaire survey, which was divided into physical and psychological components. In the physical component, the questions were mainly related to the physical injuries to the patient, which could be visualized clinically and functionally. The psychological component consisted of analyzing the impact of the maxillofacial trauma to the psychological profile. Twenty patients of both sexes and ages, ranged from 15 to 62 years old were interviewed. The main cause of trauma was from motor vehicle accidents. This study appears to show that maxillofacial trauma may have a psychological impact on patients.
Chromium Removal and Sorption Mechanism from Aqueous Solutions by Wine Processing Waste Sludge (2006)

Wine processing waste sludge (WPWS) has been shown to be an effective sorbent for the sorption of heavy metals (i.e., chromium and nickel), but the mechanism of removal of hexavalent chromium [Cr(VI)] by WPWS remains obscure. The aims of this study were to determine the effects of temperature, initial concentration of Cr(VI), and particle size on the removal Cr(VI) using WPWS. The characteristics of WPWS were determined, and sorption mechanism studies were also performed. The WPWS used was a deposit mixture containing considerable quantities of chemical coagulation as well as activated sludge precipitation from the settling basins of a wastewater treatment plant. Differential scanning calorimetry (DSC) analysis revealed that the WPWS comprised abundant labile carbohydrates and few aromatic structures. According to the IR spectrum, carboxylic groups were the most important functional group in WPWS, interacting with chromium species by protonation and redox reaction. All kinetic experiments were conducted at an initial pH of 2.0, and all of them had reached steady state within 240 min. The final pH values of the suspensions were approximately 4.2, and the increase of the pH caused low Cr removal. In addition, about 2−18% of the Cr(III) remained in the liquid phase. The Cr removal percentage increased with increasing temperature (i.e., 14−25%), but it was less affected by particle size (17−22%). All kinetic data obtained from different conditions showed good compliance with a pseudo-second-order model, and the rate constant k2 was found to range from 0.032 to 0.074 g mg-1 min-1. Some of the Cr(VI) ions were reduced to Cr(III) ions as a result of oxidation of organic components in WPWS, as indicated by monitoring using the X-ray absorption near-edge spectroscopic (XANES) technique.
Benthic microbial fuel cells: long-term power sources for wireless marine sensor networks (2010)

Wireless marine sensor networks support an assortment of services in industries ranging from national security and defense to communications and environmental stewardship. Expansion of marine sensor networks has been inhibited by the limited availability and high cost of long-term power sources. Benthic Microbial Fuel Cells (BMFCs) are a novel form of energy harvesting for marine environments. Through research conducted in-lab and by academic collaborators, Trophos Energy has developed a series of novel BMFC architectures to improve power generation capability and overall system robustness. When integrated with Trophos' power management electronics, BMFCs offer a robust, long-term power solution for a variety of remote marine applications. The discussions provided in this paper outline the architectural evolution of BMFC technology to date, recent experimental results that will govern future BMFC designs, and the present and future applicability of BMFC systems as power sources for wireless marine sensor networks.
Prototype Magneto-Optical Disk Drive (1988)

A Matsushita Technics SL-P10 compact disc player has been successfully converted into a prototype magneto-optical disk drive. The project demonstrates the feasibility of dynamic read and write using low cost, currently available components. Specific modifications to the compact disc player optics and electronics include: (1) the optical pickup, (2) the tracking servo, (3) the signal amplifier, (4) the continuous linear velocity rough servo, (5) the laser driver, and (6) the addition of a bias field electromagnet. The prototype still retains the ability to read from a compact disc. Music (encoded in the compact disc digital audio format) has been recorded and played back. Quantitative measurements of the system are presented, including spectrum analyzer traces of noise levels and data from recording single frequencies. An optical computer disk drive (CD ROM) and a compact disc digital audioplayer share similar optical pickup sections and thus the modifications described in this paper can be utilized for both the audio and the computer data applications. The prototype may be used as a test apparatus for optimizing media performance and conducting media lifetime tests.
Expansions for the shape of maximum amplitude Stokes waves (1974)

Grant (1973) showed that the expansion giving the profile of a steady Stokes wave near a 120° corner was more complicated than had previously been assumed. This paper gives further terms in such an expansion, and shows that generating them cannot introduce transcendental quantities beyond those noted by Grant.
Intense pulsed ion beams: their generation and applications. Memorandum report (1980)

The fundamentals of intense pulsed ion beam generation are reviewed. The basic processes operating in reflexing electron sources, pinched electron diodes, and magnetically insulated diodes are described. Some selected applications are surveyed; included are gas laser excitation, inertial confinement fusion, field reversed ion rings, and ion acceleration by magnetic compression. (Author)
Understanding Heterogeneity and Permeability of Brain Metastases in Murine Models of HER2-Positive Breast Cancer Through Magnetic Resonance Imaging: Implications for Detection and Therapy (2015)

Significant heterogeneity is present in these models of brain metastases from HER2+ breast cancer. Understanding this heterogeneity, especially as it relates to BBB permeability, is important for improvement in brain metastasis detection and treatment delivery.
Amino acid sequence of Escherichia coli biotin carboxyl carrier protein (9100). (1977)

The amino acid sequence of a proteolytic fragment of Escherichia coli biotin carboxyl carrier protein was determined from the structures of overlapping tryptic, thermolytic, and staphylococcal protease peptides together with automated sequenator analyses on the intact protein. The fragment, 82 residues in length, contains the single residue of biocytin of the protein. The relationship of the Mr = 9100 fragment to the native Mr = 22,500 subunit is discussed.
Terahertz Technology: Terahertz Tomographic Imaging With a Fresnel Lens (2002)

Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text Shaohong Wang, Xi-Cheng Zhang, Martin P. Maley, Michael F. Hundley, Lev N. Bulaevskii, Alexei E. Koshelev, and Antoinette J. Taylor, "Terahertz Technology: Terahertz Tomographic Imaging With a Fresnel Lens," Optics & Photonics News 13(12), 58-58 (2002) Export Citation BibTex Endnote (RIS) HTML Plain Text Citation alert Save article
Direct-Current Predictive Control Strategy for Inhibiting Commutation Failure in HVDC Converter (2014)

Commutation failures, which may lead to outage of HVDC systems, usually occur in line-commutated HVDC systems, especially in the inverter stations. As a method to reduce the risk of commutation failures, additional angle deducted from the firing order at the inverter station has its inherent limitations. In this paper, by analyzing the inverter transient process of normal commutation and commutation failure especially, it is shown that direct-current control can be used to inhibit the commutation failures and present an improvement strategy of control system on the inverter side. Based on the analysis of commutation failure prevention (CFPREV), an approach of direct current value setting is proposed, the selections of parameters in calculating process are CFPREV-based in order to implement it conveniently, and the dc current predictive control strategy is applied by modifying the conventional control system at the inverter. The validity is proved by simulation of the CIGRE HVDC model and multi-infeed HVDC model based on CIGRE HVDC, where various ac system faults in PSCAD/EMTDC are set manually. The results show that the proposed algorithm is very effective in inhibiting commutation failures or repetitive ones, and even would enhance fault-ride-through capability of HVDC system with commutation failures.
Experiment Study of Oil-Air Lubrication on Cooling of Turning Tools (2011)

When lubricants are used according to special requirements, it is possible to achieve considerable cost savings. Compared to conventional coolant cooling technology used in metal cutting, oil-air lubrication increases cooling performance, avoids environmental pollution, reduces running and maintenance costs. The cutting temperature contrast experimental research was based on close to practice 45# steel in dry cutting, wet cutting and oil-air lubrication conditions. The research work concentrated on the superiority of oil-air lubrication cooling and the influence of cutting amount on temperature. The experimental results show that oil-air lubrication is more effective in reducing the cutting temperature than wet cutting or dry cutting, this paper details the cutting temperature curves at several different tests provides a basis for industrial production, improves the level of machining process and the significance was being reported.
Proving expected sensitivity of probabilistic programs with randomized variable-dependent termination time (2019)

The notion of program sensitivity (aka Lipschitz continuity) specifies that changes in the program input result in proportional changes to the program output. For probabilistic programs the notion is naturally extended to expected sensitivity. A previous approach develops a relational program logic framework for proving expected sensitivity of probabilistic while loops, where the number of iterations is fixed and bounded. In this work, we consider probabilistic while loops where the number of iterations is not fixed, but randomized and depends on the initial input values. We present a sound approach for proving expected sensitivity of such programs. Our sound approach is martingale-based and can be automated through existing martingale-synthesis algorithms. Furthermore, our approach is compositional for sequential composition of while loops under a mild side condition. We demonstrate the effectiveness of our approach on several classical examples from Gambler's Ruin, stochastic hybrid systems and stochastic gradient descent. We also present experimental results showing that our automated approach can handle various probabilistic programs in the literature.
Buckling of Laminated Columns (1955)

Abstract A theory is developed to determine the buckling of laminated columns composed of two or more laminations and riveted or fixed together at certain points along the column. The laminations can be of different size and material but must be long in comparison to the cross-sectional dimensions. The final result is presented in a form suitable for easy application. It is shown that for two laminations joined at an infinite number of points the problem reduces to that of a simple column. Two pinned-end columns were tested and the results are in satisfactory agreement with the theory.
Secondary structure and mutational analysis of the Mason-Pfizer monkey virus RNA constitutive transport element. (1997)

The Mason-Pfizer monkey virus (MPMV) genome contains a cis-acting element that serves to facilitate nucleocytoplasmic export of intron-containing RNA. This element, known as the constitutive transport element (CTE), has been mapped to a 154-nt region close to the 3' end of the MPMV genome. The CTE contains a degenerate direct repeat of approximately 70 nt. We have probed the secondary structure of the CTE using double-strand- and single-strand-specific ribonucleases and chemical modification agents. A mutational analysis was also performed to confirm critical features of the CTE structure, as well as to identify regions that contain sequence-specific information required for function. Our results indicate that the CTE forms a long stem structure that contains a 9-nt terminal hairpin loop as well as two identical 16-nt inner loops. The inner loop sequences are rotated 180 degrees relative to each other within the structure. The mutational analysis shows that primary sequences in the loop regions are important for function, suggesting that they may contain binding sites for cellular proteins involved in RNA export. Interestingly, sequences with significant homology to the inner loop regions are found in the genomes of spumaviruses and mouse intracisternal A particles.
A 10.5 cm Ultrasound Link for Deep Implanted Medical Devices (2014)

A study on ultrasound link for wireless energy transmission dedicated to deeply implanted medical devices is presented. The selection of the frequency to avoid biological side effects (e.g., cavitations), the choice of the power amplifier to drive the external transducers and the design of the rectifier to maximize the energy extraction from the implanted transducer are described in details. The link efficiency is characterized in water using a phantom material for a transmitter-receiver distance of 105 mm, transducers active area of 30 mm × 96 mm and 5 mm × 10 mm, respectively, and a system efficiency of 1.6% is measured.
Biological Activities of Oligonucleotides Linked to Poly(L-Lysine) (1987)

Abstract We have developped a method to couple oligonucleotides to poly(L-lysine). This tool has been tested with anti m-RNA synthetic oligodeoxyribonucleotides and 2′-5′(A)n and allows oligonucleotides to enter intact cells.
Comparison of the pathogenicities of<i>Fusarium solani</i>and<i>Candida albicans</i>in the rabbit cornea (1986)

The pathogenicity of F. solani was compared with that of Candida albicans in experimental keratitis in rabbits. F. solani was inoculated into the right eye of each rabbit, and C. albicans into the left eye. The corneal lesions in both eyes were examined by slit lamp every day for 3 weeks and the severity of infections compared clinically and histopathologically. F. solani produced significantly more severe clinical infection in the cornea, compared to C. albicans. Histopathologically, F. solani appeared to spread more rapidly, enter the anterior chamber more easily, and produce a more severe inflammatory reaction in the cornea, compared to C. albicans.