gebhart/patrepeval huggingface dataset:
Morbilidad y mortalidad de la cirugía valvular aórtica (2012)

RESUMEN. La cirugía de reemplazo de las válvulas cardiacas, mejoró sustancialmente el resultado de los pacientes con valvulopatías severas. Los estudios epidemiológicos posibilitan realizar un diagnóstico de la situación, identificar y jerarquizar problemas e instrumentar las acciones necesarias, de manera racional, para su modificación. El objetivo de este trabajo, es caracterizar la morbilidad y la mortalidad en el postoperatatorio de la cirugía de la válvula aórtica, en el Hospital Clínico Quirúrgico Hermanos Ameijeiras. Se realizó un análisis estadístico descriptivo, retrospectivo, y de corte transversal. La Estenosis Aórtica fue la patología que mayor número de pacientes incorporó al estudio con 47 pacientes. La sustitución valvular aórtica de manera aislada se practicó en 54 para un 66,7 % de los pacientes. Seguidamente encontramos en orden de frecuencia la asociación con la sustitución de la válvula mitral realizada en 17 pacientes (21 %). Fueron revascularizados en el mismo tiempo de la sustitución valvular aórtica, 8 enfermos (9,9%). Las prótesis mecánicas de los diámetros 19 mm y 21 mm fueron las más usadas. Las complicaciones postoperatorias más frecuentes fueron las arritmias, seguidas por el bajo gasto cardiaco y la sepsis respiratoria. Las cirugías combinadas influyeron negativamente en los indicadores de morbilidad y mortalidad
Triplet annihilation exceeding spin statistical limit in highly efficient fluorescent organic light-emitting diodes (2009)

We have demonstrated that the exemplary red fluorescent organic light-emitting diodes (OLEDs) gain as much as half of their electroluminescence from annihilation of triplet states generated by recombining charge carriers. The magnitude of triplet-triplet annihilation (TTA) contribution in combination with the remarkably high total efficiencies [&gt;11% external quantum efficiency (EQE)] indicates that the absolute amount of electroluminescence attributable to TTA substantially exceeds the limit imposed by spin statistics, which was independently confirmed by studying magnetic field effects on delayed luminescence. We determined the value of 1.3 for the ratio of the rate constants of singlet and triplet channels of annihilation, which is indeed substantially higher than the value of 0.33 expected for a purely statistical annihilation process. It is, however, in an excellent quantitative agreement with the extent of the experimental contribution of delayed luminescence to steady-state electroluminescence. The nonstatistical branching ratio of the two annihilation channels is attributed to the favorable relationship between the energies of the excited singlet and triplet states of rubrene—emissive layer host. We surmise that, with the appropriate emissive layer materials, the fluorescent OLED devices are capable of using a considerably larger fraction of triplet states than was previously believed. In principle, the upper limit for the singlet excited state yield in the TTA process is 0.5, which makes the maximum internal quantum efficiency of fluorescent OLEDs to be 25%+0.5×75%=62.5%. The estimates of maximum EQE of the fluorescent OLEDs should be revised to at least 0.2×62.5%=12.5% and, likely, even higher to account for optical outcoupling exceeding 0.2.
Low losses bidirectional switch for AC mains (2009)

Two power bipolar transistors structures called the trench base-shielded bipolar transistor (TBSBT) and Gate Associated Transistor (GAT) were proposed and experimentally demonstrated. Those structures incorporate deep P+ area in the purpose to achieve high current gain without compromising on the breakdown voltage. In this paper, we suggest a new behaviour for a bipolar bidirectional switch with very low on-state voltage drop, and having a fully turn-on/turn-off control for main application. We propose to use two high current gain bipolar power transistors, one to control the forward current, and the second one to short-circuit the complementary diode, thus, for the first time, significantly decrease its power dissipation.
Description of the techniques used in the family-based PA counseling. (2015)

<p>PA = physical activity; SCT = Social Cognitive Theory; TPB = Theory of Planned Behavior; Face-to-face = face-to-face discussion between parent and counselor.</p><p>Description of the techniques used in the family-based PA counseling.</p>
Helicobacter pylori infection (1993)

The discovery of Helicobacter pylori is arguably the most significant advance made in gastroduodenal pathology this century. It is the most important cause of chronic gastritis, and almost certainly the major aetiological factor responsible for duodenal ulcer and probably for gastric ulcer as well. Evidence is accumulating which suggests that it may play an important role in the pathogenesis of gastric cancer. H. pylori is thought to be transmitted by the faecal-oral route or possibly oral-oral route, with iatrogenic transmission also reported. The prevalence of H. pylori infection increases with age, is commonest in developing countries, in certain ethnic minorities and those in lower socio-economic and educational groups. The organism can be eradicated using combinations of antibiotics; when treatment is successful inflammatory changes resolve, duodenal ulcers heal and do not subsequently recur.
Bayesian Inference in Gaussian Model-based Geostatistics (2002)

In a geostatistical analysis, spatial interpolation or smoothing of the observed values is often carried out by a procedure known as kriging. In its basic form, kriging involves the construction of a linear predictor for an unobserved value of the process, and the form of this linear predictor is chosen with reference to the covariance structure of the data as estimated by a data-analytic tool known as the variogram. Often, no explicit underlying stochastic model is declared. We adopt a model-based approach to this class of problems, by which we mean that we start with an explicit stochastic model and derive associated methods of parameter estimation, interpolation and smoothing by the application of general statistical principles. In particular, we use Bayesian methods of inference so as to make proper allowance for the uncertainty associated with estimating the unknown values of model parameters. To illustrate the model-based approach we analyse data on precipitation levels in Paraná State, Brazil.
Linear predictive coding with modified filter structures (2001)

In conventional one-step forward linear prediction, an estimate for the current sample value is formed as a linear combination of previous sample values. In this paper, a generalized form of this scheme is studied. Here, the prediction is not based simply on the previous sample values but on the signal history as seen through an arbitrary filterbank. It is shown in the paper how the coefficients of a modified model can be obtained and how the inverse and synthesis filters can be implemented. Various properties of such systems are derived in this article. As an example, a novel linear predictive system using inherently logarithmic frequency representation is introduced.
Welding of Transparent Materials Using Femtosecond Laser Pulses (2005)

We report on laser welding between transparent materials without the insertion of intermediate layers such as glue by use of near-infrared femtosecond laser pulses. When femtosecond laser pulses are focused at the interface of transparent materials, the material around the focal point is melted and resolidified because of the temperature increases due to the localized nonlinear absorption of optical pulse energy. We experimentally succeeded in laser welding between two pieces of silica glass without the insertion of an intermediate layer by femtosecond laser pulses. This technique has a possible application to the joining of semiconductors such as silicon crystals.
Effect of curvature on the impact damage characteristics and residual strength of composite plates (1998)

The results of a study of the response and failure characteristics of thin, cylindrically curved, composite plates subjected to low-speed impact damage are presented. The results indicate that the plate radius and the plate thickness are important structural parameters that influence the nonlinear response of a plate for a given amount of impact energy. Analytical and experimental contact-force results are compared for several plates and the results correlate well. The impact-energy levels required to cause damage initiation and barely visible impact damage are a function of the plate radius for a given plate thickness. The impact-energy levels required to initiate impact damage for plates with a certain range of radii are greater than plates with other radii. The contact-force results corresponding to these impact-energy levels follow a similar trend. Residual strength results for plates with barely visible impact damage suggest that the compression-after-impact residual strength is also a function of plate radius. The residual strength of impact-damaged flat plates appears to be lower than the residual strength of the corresponding cylindrically curved plates.
Intensity inhomogeneity correction for magnetic resonance imaging of human brain at 7T (2014)

Intensity inhomogeneity in 7T MRI can be successfully corrected using SPM8 for various scan sequences.
Teleworks: a CSCW application for remote medical diagnosis support and teleconsultation (1998)

The present paper describes methods for the design of both synchronous and asynchronous computer-supported cooperative work (CSCW) procedures suitable for the medical application area and specifically for the purpose of medical teleconsultation and remote diagnosis support. The experimental implementation of a CSCW system built upon a PC/Windows platform is detailed as an example of a low-cost system suitable for adoption in a wide range of medical teleconsultation applications.
High-efficiency, single-lobe surface-emitting DFB/DBR lasers (2002)

Recently, it has been shown (Witjaksono and Botez, Appl. Phys. Lett., vol. 78, p. 4088, 2001) that DFB/DBR devices with central (grating) phase shift around /spl pi/ fundamentally favor lasing in an orthonormal, single-lobe beam pattern. Here, we present a study of the novel device's intermodal discrimination and efficiency as a function of the grating duty cycle; the optimization of the device for maximum efficiency; and the first experimental realization of a semiconductor grating incorporating a /spl pi/ phase shift. External differential quantum efficiencies as high as 62% can be obtained from devices with 22 cm/sup -1/ threshold gain.
Adsorption of Nonionic Surfactants on Silica Sol Particles:  The Effects of Sol Type and Concentration, Surfactant Type, Concentration, and Temperature (1996)

Small angle neutron scattering has been used to investigate the nature of the adsorption of the alkyl polyoxyethylene ether (CnEOm) nonionic surfactants on Ludox silica sols. Variations in the adsorbed layer thickness and volume fraction of surfactant in the adsorbed layer with sol type, concentration, temperature, and surfactant type are observed. In particular, the structure of the adsorbed layer of the C16EO6 and C16EO8 surfactants (for which the bulk micellar phase is rodlike micelles) is similar to that found for the C12EO6 and C12EO5 surfactants.
Fluidized‐bed fermenters: A steady‐state analysis (1982)

A new mathematical model is presented model is presented for use in the design and optimization of fluidized-bed fermenters. Unlike previous models, the biomass particle size is not a required input parameter, but is predicted as a consequence of the process by which the fermenter reaches a steady state. Both tower fermenters and supported-film bioreactors are included in the analysis. The differences between them are explained as a consequence of the different effects of added biomass on the particle settling velocity and the tendency of a fluidized bed to stratify. A detailed qualitative treatment of solids mixing allows the model to predict the varying biomass concentration through a tower fermenter and the more constant concentration in the supported film reactor. Other features of this analysis are the inclusion of an axial dispersion term to allow for different liquid mixing conditions, and the introduction of a variable transformation that eliminates the need for a computer solution. A sample design problem is included.
Complete genome sequence of the filamentous gliding predatory bacterium Herpetosiphon aurantiacus type strain (114-95T) (2011)

Herpetosiphon aurantiacus Holt and Lewin 1968 is the type species of the genus Herpetosiphon, which in turn is the type genus of the family Herpetosiphonaceae, type family of the order Herpetosiphonales in the phylum Chloroflexi. H. aurantiacus cells are organized in filaments which can rapidly glide. The species is of interest not only because of its rather isolated position in the tree of life, but also because Herpetosiphon ssp. were identified as predators capable of facultative predation by a wolf pack strategy and of degrading the prey organisms by excreted hydrolytic enzymes. The genome of H. aurantiacus strain 114-95(T) is the first completely sequenced genome of a member of the family Herpetosiphonaceae. The 6,346,587 bp long chromosome and the two 339,639 bp and 99,204 bp long plasmids with a total of 5,577 protein-coding and 77 RNA genes was sequenced as part of the DOE Joint Genome Institute Program DOEM 2005.
Altered cognitive performance and synaptic function in the hippocampus of mice lacking C3 (2014)

Previous work implicated the complement system in adult neurogenesis as well as elimination of synapses in the developing and injured CNS. In the present study, we used mice lacking the third complement component (C3) to elucidate the role the complement system plays in hippocampus-dependent learning and synaptic function. We found that the constitutive absence of C3 is associated with enhanced place and reversal learning in adult mice. Our findings of lower release probability at CA3-CA1 glutamatergic synapses in combination with unaltered overall efficacy of these synapses in C3 deficient mice implicate C3 as a negative regulator of the number of functional glutamatergic synapses in the hippocampus. The C3 deficient mice showed no signs of spontaneous epileptiform activity in the hippocampus. We conclude that C3 plays a role in the regulation of the number and function of glutamatergic synapses in the hippocampus and exerts negative effects on hippocampus-dependent cognitive performance.
Transformerless multicellular dc-dc converter for highly efficient next generation dc distribution system (2017)

A transformerless multicellular dc-dc converter has been newly proposed. The capacitively isolated dc-dc cell converters have been applied to develop the multicellular converter without using high frequency transformers. The high voltage transformation ratio is achieved by the ISOP (Input Series Output Parallel) connection topology of the cell converters and the realization of the highly efficient cell converter is expected because of no transformers. A 144 V-24 V, 200 W prototype of the multicellular dc-dc converter using 3 cell converters based on the capacitive isolation has been developed, and the feasibility of the transformerless multicellular converter has been confirmed.
Complete separation of lipid classes on a single thin-layer plate (1966)

A double-development procedure employing first a polar and then a nonpolar solvent system is described for the complete separation by thin-layer chromatography of the main lipid classes encountered in natural lipids. For better quantification, long plates (34 cm) are employed. Diglycerides were separated from cholesterol, 1,2- from 1,3-diglycerides, and monoglycerides from phospholipids.
Innovative design of microencapsulated phase change materials for thermal energy storage and versatile applications: a review (2019)

This review focuses on methodologies, technologies and innovative design of microencapsulated PCMs with a variety of shells for versatile applications.
Balance Training Improves Function and Postural Control in Those with Chronic Ankle Instability (2008)

Four weeks of balance training significantly improved self-reported function, static postural control as detected by TTB measures, and dynamic postural control as assessed with the SEBT. TTB measures were more sensitive at detecting improvements in static postural control compared with summary COP-based measures.
Selective inhibition of E. coli1-deoxy-<scp>d</scp>-xylulose-5-phosphate synthase by acetylphosphonates (2011)

DXP synthase catalyzes the formation of 1-deoxy-D-xylulose 5-phosphate, an essential precursor in pathogen isoprenoid biosynthesis. The selective inhibition of this ThDP-dependent transformation is a challenging goal in the development of isoprenoid biosynthesis inhibitors. Potent, selective inhibitors could lead to new anti-infective agents. Here, we demonstrate selective inhibition of E. coli DXP synthase by butylacetylphosphonate.
<i>In vivo</i> Effects of the Insulin‐Like Growth Factors (IGFs) in the Hypophysectomized Rat: Comparison with Human Growth Hormone and the Possible Role of the Specific IGF Carrier Proteins (1985)

Insulin-like growth factors (IGF) I and II produce acute insulin-like effects or promote growth indices in hypophysectomized rats, depending on their mode of administration. Intravenous bolus injections of IGF I and II, like insulin, lower the blood sugar level and lead to a pronounced stimulation of glycogen synthesis in skeletal muscle. The two factors are equipotent in this respect. Continuous subcutaneous infusions of IGF I or II over six days have no hypoglycaemic effect. They mimic the effects of growth hormone, increasing the width of the tibial epiphysis and stimulating the thymidine-incorporating activity of costal cartilage in the absence of growth hormone. IGF I (identical to somatomedin C) is more potent than IGF II and causes a dose-dependent increase in body weight at concentrations where IGF II is still ineffective. The absence of acute insulin-like effects in long-term experiments is explained by the presence in serum of highly specific carrier proteins that interfere with the insulin-like properties of IGF I and II and restrict their capillary permeability. Growth hormone induces the formation of both IGF and the major IGF carrier protein in the liver. Thus, while IGFs mediate the actions of growth hormone on growth, growth hormone appears to modulate these actions via IGF carrier proteins.
Zinc Coated Press-Hardening Steel - Challenges and Solutions (2015)

<div class="section abstract"><div class="htmlview paragraph">Press-hardening steels get more and more popular for body in white applications as an approach to meet the demands of passenger safety and CO<sub>2</sub> reduction. Unlike the larger part of the structure that is typically zinc coated, the majority of the PHS parts is either uncoated or aluminum silicon coated. This paper shall give an overview of press-hardening steels with zinc coatings with detailed results for corrosion resistance, weldability and mechanical properties for strength levels of 490 to 1800 MPa.</div><div class="htmlview paragraph">Furthermore as for zinc coated material maintaining a robust press-hardening process is of even higher importance than for uncoated or AlSi coated material. A range of different processes including indirect and direct process are shown in detail. Especially the topic of micro-cracks, mechanisms and avoidance of micro-cracks in the direct process will be discussed. Results from industrial and semi industrial production are shown.</div></div>
Incorporation of rare gases in sputtered amorphous metal films (1977)

The examination of bias‐sputtered rare‐earth transition‐metal amorphous films shows large concentrations of the sputter gas incorporated in the films. Incorporation of various inert gases (i.e., Ne, Ar, and Kr) was studied as a function of applied bias (Va), target voltage, pressure, target composition, and substrate‐to‐target separation. In general, the atomic fraction of rare gas in the film follows a Va2 dependence. At high bias voltage the inert‐gas concentration appears to reach a limiting value or tends to decrease. The maximum concentration is determined by sputter‐gas pressure, target composition, and target‐to‐counter‐electrode‐area ratio. Here we report stable amorphous metal–inert‐gas alloys with gas concentrations up to 30 at. %. Details of the fabrication, stability, and mechanism of formation of these unique metastable phases are discussed.
Spectrophotometric determination of chlorophyll-A,B and total carotenoid contents of some algae species using different solvents (1998)

In our study, chlorophyll a, chlorophyll b and the total amounts of carotenoids in Cladophora glomerata (L.) Kuetzing, Ulva rigita L., Codium tomentosum (Huds.) Stackh and Cladostephus verticillatus Ag. species were determined. Methanol, acetone and diethyl ether were used as solvents. The chlorophyll amount in Cladophora glomerata L. Kuetzing, species and carotenoids in Cladostephus verticillatus Ag. were found the highest. It was observed that sonication had no much contribution to the extraction.
Correlated ion hopping in single-crystal yttria-stabilized zirconia (1997)

A study of the effect of correlated ion motion on the electrical conductivity relaxation in single-crystalline yttria-stabilized zirconia is presented. Complex admittance in the radio frequency range show power-law dependencies in the real part of the conductivity at high frequencies of the form ${\mathrm{\ensuremath{\omega}}}^{\mathrm{n}}$ and asymmetric electric modulus plots as a result of correlations. An analysis of the frequency dependence of the electric modulus is conducted to obtain time decay functions of the form exp[-(t/\ensuremath{\tau}${)}^{\mathrm{\ensuremath{\mathrm{B}}}}$] from an analytical distribution of relaxation times. Correlation times, and parameters n and \ensuremath{\mathrm{B}} characterizing the relaxation in time and frequency domains are compared to show the equivalence of time and frequency representations. The common origin of ac and dc processes is discussed in view of the frequency dependence of the complex conductivity. From a macroscopic activation energy for ion motion E=1.16 eV and a \ensuremath{\mathrm{B}} value of 0.43, a single-ion microscopic activation energy ${\mathrm{E}}_{\mathrm{a}}$=0.5 eV is obtained as \ensuremath{\mathrm{B}}E according to Ngai's coupling model. The microscopic activation energy is related to the association energy of oxygen vacancies.
Invasive and Concomitant Noninvasive Intraoperative Blood Pressure Monitoring (2011)

NIBP was generally higher than ABP during periods of hypotension and lower than ABP during periods of hypertension. The use of NIBP measurements to supplement ABP measurements was associated with decreased use of blood transfusions, vasopressor infusions, and antihypertensive medications compared with the use of ABP alone.
Design and development of novel inductively coupled RFID antennas (2006)

Inductively coupled RFID antennas in two different structures, namely arc-shape and dual-body configurations, are presented. High input resistance can be easily achieved with these structures to realize conjugate impedance matching with some tag chips. 1.99 dBi and 5.62 dBi directivities at 915 MHz are also observed.