gebhart/patrepeval huggingface dataset:
Psychological Attribution Analysis of Medical College Students Skipping Classes (2018)

In recent years, some data about college students skipping classes showed that the truancy of college students has become a prominent teaching problem which commonly exists. By collecting problems of full-time medical students of the Southwest Medical University to master the situation of students skipping classes, the author conducts attribution analysis and puts forward some corresponding countermeasures, hoping to provide reference for the school's management and related institutions and thereby improving the quality of teaching in schools.
Introduction of linear cyclostationary filters to model time-variant channels (2003)

In modern telecommunications, the transmission systems are often modelised by linear time-varying filters and linear random filters. We recall the definitions of the linear time-invariant and periodic time-varying filter. The authors generalize then the definition of linear stationary filter into a particular case of the linear random filter, the linear cyclostationary filter. The optimal reconstruction method of a signal submitted to a cyclostationary filter is introduced. It is particularly difficult to apply. Thus, we present a suboptimal reconstruction method. We apply this result to a signal submitted to a particular cyclostationary filter. The signal is in fact filtered successively through a linear periodic time-varying filter and submitted to a stationary jitter. We obtain reconstruction results in the case of a transmission of N.R.Z. signals.
Rheology Modification for Safe Cementing of Low-ECD Zones (2016)

Abstract Long-term zonal isolation requires effective mud displacement. One best practice for achieving this is to use the highest pumping rates allowable during cementing operations. However, in zones with a narrow pressure window, fracture pressure sometimes does not support higher flow rates. This is because high flow rates result in high friction pressures, which can exceed the fracture pressure of the formation. This is an issue particularly in long horizontal wells. In such cases, fluid rheology is important for achieving better displacement efficiency without inducing fractures. The current work discusses a procedure in which the rheology of cement slurry can be tuned such that good displacement efficiency is attained at sufficiently low flow rates. The tuning should be such that the shear stress is almost invariant for varying shear rates. This reduces the friction pressures considerably during placement. A hydraulics model was run on an example well configuration with a narrow margin situation. Pressure response and displacement characteristics of two types of slurries were analyzed. These include conventional and modified slurry, the latter of which was tuned for better mud displacement at low flow rates. The modified slurry showed an increase in yield point with a shear stress profile that was almost invariant for the range of shear rates analyzed. A decrease in equivalent circulating density (ECD) occurred as a result of rheology modification, and this resulted in avoiding ECDs exceeding the fracture gradient at critical locations. Displacement efficiency increased by 10% when using the modified slurry at the same pump rates as those used for the conventional slurry. On the other hand, when targeting the same displacement efficiency as the conventional slurry, the required pump rates for the modified slurry were lower. This study indicates that better displacement can be attained through rheology modification, even by using relatively low flow rates, thereby maintaining low ECDs to help ensure effective cementing operations.
Research on High-performance Tin Phosphorus Bronze C5210 Copper (2009)

By using the method of horizontal continuous casting and high-precision cold-rolled,high-performance tin phosphorus bronze C5210 copper is studied.The difficult problem that 400 mm wide high-performance tin phosphorus bronze C5210 copper cannot be rolled is solved by using large processing rate and tension leveling and transforming the 14-high roller mill in the stainless steel industry.The tensile strength in SH state can be up to more than 730MPa,the elongation can be up to over 12% and the thickness accuracy can be about to 0.002mm,which meet the requirements of consumers for high-performance and high elasticity copper.
Frequency and ridge estimation using structure tensor (2013)

Computing a reliable orientation map is a critical step in automatic fingerprint analysis and especially for analysis of fingermarks obtained at crime-scenes especially. Being the initial step of processing image information it may influence the further operations: registration, enhancement and matching. We suggest a new way of automatic frequency estimation improving the state-of-theart results [1], [2] favourably for noisy images. We suggest using frequency to steer Structure Tensor [3] which is used to obtain refined orientation maps. Fingermarks collected from crime scenes are usually low quality images, therefore lacking the support of automatic image analysis methods. Forensic expertise is utilized for the major part of the image analysis: registration of minutia, ridge frequency count, etc. It is desirable to support an expert by providing reliable orientation maps to ease the work. Having orientation maps estimated we can further provide suggestions for an expert (possible minutia location and orientation) to increase his/her efficiency. A structure tensor is a symmetric positive semidefinite matrix that can be utilized for building orientation maps of fingerprints. Response of the gradient filter, upon convolution with the image, is used for estimating frequency of the image. We provide mathematical descriptions to support the method. Suggested method provides maps of frequency that are continuous in the mathematical sense. We have tested suggested frequency estimation on the NIST SD27 database to perform ridge counting. The fingermark ridge count procedure is desirable but time consuming for an expert as it grows quadratically with the number of minutia we want to count ridges of. Also it is not fully reliable to be done automatically. The ridge count does not only depend on the frequency but also on the wave vector direction connecting two minutia points. We model a fingerprint image in the neighbourhood R around two minutiae with the planar wave cos(ω0r). Here, ω0 is a known constant wave vector (frequency of the image ridge flow calculated a forehead) and r is the line joining two minutia points.
A Digital Adaptive Discontinuous Current Source Driver for High-Frequency Interleaved Boost PFC Converters (2013)

A digital adaptive current source driver (CSD) is proposed for the interleaved Boost PFC converter. The adaptive drive current is achieved for the CSDs to optimize the switching loss and gate drive loss according to different turn-on and turn-off drain currents in a wide load range. Compared to the adaptive CSDs with the linear regulator, the digital adaptive CSD is able to eliminate the additional loss and cost introduced by the linear regulator. The most important benefit of the digital CSD is that the turn-on and turn-off drive current can be adjusted independently according to the different turn-on and turn-off drain currents. At the same time, the proposed digital CSD is compatible with other advanced digital control technique. The proposed digital CSD is applied to the interleaved Boost PFC converter under critical conduction mode (CRM) to reduce the high turn-off loss and gate drive loss. A 220-V AC input, 380-V/400-W output, two-phase interleaved Boost PFC converter with the switching frequency of 90-500 kHz under CRM was built to verify the functionality and advantages of the digital CSD.
Concerted Electron Transfer in Iminopyridine Chromium Complexes: Ligand Effects on the Polymerization of Various (Di)olefins (2018)

A study of reactions among CrCl2, CrCl3(THF)3, and iminopyridine ligands differing in the nature of the substituents at the iminic carbon and at the ortho positions of the aryl ring (2,6-R12C6H3N═CR2(C5H3N) (R1 = R2 = H (L1); R1 = iPr, R2 = H (L2); R1 = H, R2 = CH3 (L3)) but featuring close electron-accepting properties has provided a new example of the redox chemistry of chromium complexes. The reactions of unsubstituted aniline L1 and of L3 with CrCl2 give rise to [(L1•)CrIIICl2(THF)]− (Cr1) and [(L3•)CrIIICl2(THF)]− (Cr3) complexes, respectively, containing chromium in the physical trivalent oxidation state and the ligand in the monoanionic radical state (L•)− as a result of a one-electron transfer from the metal to the ligand. In contrast, the reactions of CrCl2 with the ortho-substituted L2 and of CrCl3(THF)3 with the unsubstituted L1 give rise to [(L2)CrIICl2(THF)]0 (Cr2) and [(L1)CrIIICl3(THF)]0 (Cr4) having the chromium in the divalent and trivalent oxidation states, respectively, and the unperturbed ligand in the neutral state. All four complexes were used, in combination with methylaluminoxane (MAO), as catalyst precursors for the polymerization of ethylene, cyclic olefins (i.e., norbornene and dicyclopentadiene), and 1,3-butadiene. A chromium to ligand synergy, coupled with a good stability of the active intermediate in the presence of the Al activator, proven particularly effective in the polymerization of ethylene, especially for Cr1, giving high molecular weight linear poly(ethylene)s. The formalism in the metal oxidation state does not affect the reactivity toward the cyclic olefins and 1,3-butadiene, while ligand steric effects emerge clearly. The use of bulky ortho substituents shuts down the activity in the polymerization of cyclic olefins, particularly for the bulkier dicyclopentadiene, and reverses the catalyst chemoselectivity in the polymerization of 1,3-butadiene.
Enhanced Performances of Quantum Dot Lasers Operating at 1.3 $\mu$ m (2008)

Due to their delta-like density of states, quantum dots (QDs) were expected to improve laser device performances with respect to quantum wells (QWs). Nevertheless, some important drawbacks limit this technology. For instance, QD laser still suffers from a low value of the modal gain, due to the low areal density of QDs, and inhomogeneous broadening, especially when multistacked layers are used. In this paper, we demonstrate that a linear increase of the QD modal gain with the QD layers number, as typically achieved in multi-QW lasers, is possible by a careful control of the Stranski-Krastanov QDs growth and QDs stacking optimization. A low-transparency current density of 10 A/cm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> per QD layer and a modal gain of 6 cm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-1</sup> per QD layer were achieved from laser structures containing up to seven QD layers. We demonstrate 10-Gb/s direct modulation (until a temperature of 50 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">deg</sup> C) and high <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">T</i> <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> (110 K) from a single-mode device containing six QD layers.
Herriott Cell augmentation of a quadrature heterodyne interferometer (2003)

A quadrature heterodyne interferometer is augmented with a Herriott Cell multipass reflector to increase instrument resolution, enable a separation of the phase shift due to neutral density from room vibrations, and optimize the diagnostic for small scale length measurements or for planar measurements. Analysis is used to illustrate retro-reflective planar measurement geometries attainable with the instrument and to show that phase front degradation and loss of scene beam intensity does not introduce a systematic measurement uncertainty. The diagnostic capability is demonstrated with measurements of the electron and neutral densities in the plasma exhaust from electric propulsion thrusters. Experimental data with up to 18 passes through plasma demonstrates that the instrument resolution to electron and neutral density increases almost linearly with number of passes, and that the Herriott Cell can be used to increase the signal of neutral density phase shifts relative to the noise of the phase shifts due to room vibrations. For the Pulsed Plasma Thruster plasma exhaust used to validate the instrument, the addition of the Herriott Cell reduces the density measurement uncertainty to equal or less than the uncertainty due to discharge irreproducibility.
Presence of β-glucosidase (bgl1) gene in Phaeosphaeria nodorum and Phaeosphaeria avenaria f.sp. triticea (2005)

Phaeosphaeria avenaria f.sp. avenaria (Paa), the causal agent of stagonospora leaf blotch in oats, produces a glycosyl hydrolase family 3 enzyme, β-glucosidase, which is responsible for detoxification of steroidal avenacosides in oat leaves, but is not essential for pathogenicity. For a comparative genetic relatedness study, a Paa-like β-glucosidase gene (bgl1) was PCR-amplified from Phaeosphaeria nodorum and P. avenaria f.sp. triticea, and Phaeosphaeria spp. from dallis grass (Paspalum dilatatum) (isolate S-93-48) and rye (Secale cereale) (isolate Sn48-1). Different sizes of bgl1 gene coding sequences ranging from 3018 to 3023 bp were determined. The bgl1 gene structure in these Phaeosphaeria species was identical to that of Paa and contained four exons and three introns. Nucleotide variations occurring in introns 1 and 2 of the bgl1 gene divided wheat-biotype P. nodorum into four groups. Two 12-bp-long direct sequence repeats (5'-TCA/G ACT GGT TT/CA/G) were found in the promoter region of the bgl1 gene in Phaeosphaeria species; only one repeat was present in the two P. avenaria f.sp. triticea isolates ATCC26370 and ATCC26377 (Pat2) from foxtail barley (Hordeum jubatum) and some homothallic P. avenaria f.sp. triticea isolates (Pat1). With sequence similarities in the noncoding internal transcribed spacer region of nuclear rDNA, the partial gpd gene fragment containing the intron 4, and the full-length bgl1 gene, five Phaeosphaeria isolates (5413, 1919WRS, 1920WRS, 1921WRS, Sa37-2) from oat (Avena sativa) were molecularly determined to be Paa. Two oat isolates (Sa38-1 and Sa39-2) from Poland appeared to be Pat1. The results suggest that classification of two Phaeosphaeria avenaria formae speciales based on host specificity should be re-evaluated.Key words: wheat, oat, Phaeosphaeria, β-glucosidase gene.
[No Title] (1980)

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Concerning the Movements of the Blood Vessels in the External Ear of the Rabbit1 (2014)

Abstract This chapter concerns the movements of the blood vessels in the external ear of the rabbit. The ear of the rabbit is very sensitive to environmental and behavioral changes. The author concludes that movements of its blood vessels are correlated with sensory impressions and mental state, providing support for the author’s similar approach in the human brain. In the rabbit, contraction of the ear vessels is closely correlated with respiratory movements. Both, in turn, reflect emotional responses such as being frightened by a predator, further supporting their use in reflecting similar responses to emotional events in the cerebral circulation. The author, as well as previous workers, found that contraction and relaxation of the ear vessels are often independent of fluctuations in carotid blood pressure, providing further evidence for the independence of the circulation in different parts of the body.
How Nature Morphs Peptide Scaffolds into Antibiotics (2008)

The conventional notion that peptides are poor candidates for orally available drugs because of protease-sensitive peptide bonds, intrinsic hydrophilicity, and ionic charges contrasts with the diversity of antibiotic natural products with peptide-based frameworks that are synthesized and utilized by Nature. Several of these antibiotics, including penicillin and vancomycin, are employed to treat bacterial infections in humans and have been best-selling therapeutics for decades. Others might provide new platforms for the design of novel therapeutics to combat emerging antibiotic-resistant bacterial pathogens.
Seeing is believing on surface treated aluminium (1986)

Recherches concernant les mecanismes d'anodisation de l'aluminium, et leurs applications industrielles: collage structural de l'aluminium et production de plaques d'impression lithographique en aluminium
Effect of methylenetetrahydrofolate reductase 677C→T polymorphism on toxicity and homocysteine plasma level after chronic methotrexate treatment of ovarian cancer patients (2002)

MTHFR is a critical enzyme that regulates the metabolism of folate and methionine, both of which are important factors in DNA methylation and synthesis. Subjects with the 677C-->T variant have impaired remethylation of Hcy to methionine that could determine hyperhomocysteinemia. Remethylation of Hcy into methionine and DNA methylation are also affected by MTX treatment. Thus, a combined effect between MTX and reduced activity of the MTHFR 677C-->T polymorphism could occur, leading to toxicity. In a clinical trial, 43 ovarian cancer patients were treated with low doses of MTX. During MTX therapy, 12 patients (27.9%) developed G3/4 WHO toxicity. In these 12 patients, we observed 6 G3/4 thrombocytopenias, 1 G3 neutropenia, 1 G3 anemia, 9 G3 mucositis cases and 1 G4 mucositis case. A significant association was observed between toxicity and TT MTHFR 677 genotype (p < 0.0001). G3/4 toxicity occurred in 10 of 13 (77%), 1 of 17 (6%) and 1 of 13 (8%) patients with the TT, CT and CC MTHFR genotypes, respectively. According to the logistic regression model, patients with the TT genotype had a relative risk of 42.0 (95% CI 4.2-418.6) of developing G3/4 toxicity compared to patients with the CC and CT genotypes. Patients with the TT genotype had Hcy plasma levels after MTX therapy significantly (p = 0.0001) higher than basal levels (mean +/- SD = 16.71 +/- 4.72 vs. 12.48 +/- 3.57 micromol/l); moreover, they also had higher Hcy plasma levels after MTX than patients with other MTHFR 677 genotypes (CC mean +/- SD = 9.87 +/- 3.61 micromol/l and CT mean +/- SD = 11.48 +/- 3.13 micromol/l). Finally, significant associations were observed between G3/4 WHO toxicity and higher Hcy plasma levels after MTX treatment (p = 0.0004). In conclusion, our data suggest that the TT MTHFR 677 genotype is associated with marked MTX-induced hyperhomocysteinemia and could represent a pharmacogenetic marker for toxicity after chronic treatment with low doses of MTX.
Kinetic-photometric determination of EDTA, zinc and bismuth by interchange reactions of CN— groups (1984)

The in situ formation of the nickel(II)-6-methylpicolinaldehyde thiosemicarbazone complex by means of interchange reactions of CN— groups occurs when nickel(II), 6-methylpicolinaldehyde azine and thiosemicarbazide are mixed at pH 4.5. The reaction is monitored spectrophotometrically at 396 nm. Several species cause interferences, and these effects can be used for their indirect determination. The most important compound in this context is EDTA. This Ni(II)-EDTA-6-methylpicolinaldehyde azine-thiosemicarbazide system also permits the indirect kinetic-photometric determination of trace amounts of zinc(II) and bismuth(III).
Human Adenovirus Serotype 5 Is Sensitive to IgM-Independent Neutralization In Vitro and In Vivo (2019)

Human adenovirus 5 (HAdV-5) is used as a vector in gene therapy clinical trials, hence its interactions with the host immune system have been widely studied. Previous studies have demonstrated that HAdV-5 binds specifically to murine coagulation factor X (mFX), inhibiting IgM and complement-mediated neutralization. Here, we examined the physical binding of immune components to HAdV-5 by nanoparticle tracking analysis, neutralization assays, mass spectrometry analysis and in vivo experiments. We observed that purified mouse Immunoglobulin M (IgM) antibodies bound to HAdV-5 only in the presence of complement components. Active serum components were demonstrated to bind to HAdV-5 in the presence or absence of mFX, indicating that immune molecules and mFX might bind to different sites. Since binding of mFX to HAdV-5 blocks the neutralization cascade, these findings suggested that not all complement-binding sites may be involved in virion neutralization. Furthermore, the data obtained from serum neutralization experiments suggested that immune molecules other than IgM and IgG may trigger activation of the complement cascade in vitro. In vivo experiments were conducted in immunocompetent C57BL/6 or immuno-deficient <i>Rag2<sup>-/-</sup></i> mice. HAdV-5T* (a mutant HAdV-5 unable to bind to human or mFX) was neutralized to some extent in both mouse models, suggesting that murine immunoglobulins were not required for neutralization of HAdV-5 in vivo. Liquid Chromatography-Mass Spectrometry (LC-MS/MS) analysis of HAdV-5 and HAdV-5T* after exposure to murine sera showed stable binding of C3 and C4b in the absence of mFX. In summary, these results suggest that HAdV-5 neutralization can be mediated by both the classical and alternative pathways and that, in the absence of immunoglobulins, the complement cascade can be activated by direct binding of C3 to the virion.
Torsten Högberg. Hällristningar från Litsleby, Tegneby & Socken {Arkeologisk Rapport 1 från Vitlyckemuséet}. 108 pages, illustrations, 1 tables. 1995. Uddevalla: Bohuslän Museum; 91-7686-162-7 paperback. - Tommy Andersson. Hällristningar från Högsbyn i Tisselskogs socken {Arkeologisk Rapport 2 från Vitlyckemuséet}. 16 pages, illustrations. 1997 Dals Långed: Ask & Embla; 91-973160-1-6 (ISSN 1401-9078) paperback. - Lasse Bengtsson (ed.). Hällristningar från Askums socken Bohuslän Vol. 1. Arkeologisk Rapport 3 från Vitlyckemuséet). 97 pages, illustrations. 1997. Tanumshede: Vitlycke Museum; ISSN 1401-9078 paperback. - Lasse Bengtsson (ed.). Hällristningar frän Askums socken Bohuslän (Vol. 2; Arkeologisk Rapport 4 från Vitlyckemuséet). 75 pages, illustrations. 1998. Tanumshede: Vitlycke Museum; ISSN 1401-9078 paperback. - Lasse Bengtsson & Camilla Olsson (ed.). The World Heritage Site's central area and Grebestad (Vitlycke Museum Archaeological Report 5). 101 pages, illustrations. 2000. Tanumshede: Vitlycke Museum; ISSN 1401-9078 paperback. (2002)

Torsten Högberg. Hällristningar från Litsleby, Tegneby &amp; Socken {Arkeologisk Rapport 1 från Vitlyckemuséet}. 108 pages, illustrations, 1 tables. 1995. Uddevalla: Bohuslän Museum; 91-7686-162-7 paperback. - Tommy Andersson. Hällristningar från Högsbyn i Tisselskogs socken {Arkeologisk Rapport 2 från Vitlyckemuséet}. 16 pages, illustrations. 1997 Dals Långed: Ask &amp; Embla; 91-973160-1-6 (ISSN 1401-9078) paperback. - Lasse Bengtsson (ed.). Hällristningar från Askums socken Bohuslän Vol. 1. Arkeologisk Rapport 3 från Vitlyckemuséet). 97 pages, illustrations. 1997. Tanumshede: Vitlycke Museum; ISSN 1401-9078 paperback. - Lasse Bengtsson (ed.). Hällristningar frän Askums socken Bohuslän (Vol. 2; Arkeologisk Rapport 4 från Vitlyckemuséet). 75 pages, illustrations. 1998. Tanumshede: Vitlycke Museum; ISSN 1401-9078 paperback. - Lasse Bengtsson &amp; Camilla Olsson (ed.). The World Heritage Site's central area and Grebestad (Vitlycke Museum Archaeological Report 5). 101 pages, illustrations. 2000. Tanumshede: Vitlycke Museum; ISSN 1401-9078 paperback. - Volume 76 Issue 293