gebhart/patrepeval huggingface dataset:
Interferometric measurement of electron-hole pair recombination lifetime as a function of the injection level (1993)

The authors describe an interferometric technique for the measurement of the recombination lifetime of electron-hole pairs as a function of their concentration, which can be measured with an error smaller than 10%. In addition, the approach is much more sensitive than the other optical methods described in the literature.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
Nanocompositos polimericos com argila preparados a partir de dispersões aquosas : efeito dos contra-ions e auto-adesão (2008)

Este trabalho mostra a influencia das interacoes eletrostaticas nas propriedades fisicas e morfologicas de nanocompositos polimericos com argila preparados a partir de dispersoes aquosas, e as caracteristicas estruturais de laminados nanoestruturados autoadesivos preparados com borracha natural e argila. A preparacao dos nanocompositos envolveu a utilizacao de argilas produzidas atraves da troca do sodio por potassio, litio e calcio e a mistura destas com um latex estireno-acrilico sintetizado em laboratorio. O tipo e o grau de hidratacao dos cations influenciaram de maneira significativa as propriedades mecânicas dos nanocompositos. Mapas elementares baseados em espectroscopia por perda de energia de eletrons mostraram que os contra-ions estao presentes nas regioes onde se sobrepoem polimero e argila. Este resultado forneceu subsidios para a proposicao de um modelo, onde os contra-ions atuam como uma ponte ionica entre as lâminas de argila e a matriz polimerica, ambas contendo excesso de cargas negativas. O modelo de adesao eletrostatica mediada por contra-ions foi aplicado com sucesso na preparacao de nanocompositos com polietileno de baixa densidade e argila em meio aquoso. Os nanocompositos preparados apresentaram aumento de aproximadamente 40% no modulo elastico frente ao polimero puro, quando 4% em massa de argila foi incorporado a matriz. Para a preparacao dos laminados auto-adesivos, filmes nanocompositos com propriedades mecânicas diferentes, em funcao da quantidade de argila incorporada a matriz, mas altamente compativeis por possuirem a mesma matriz polimerica, foram unidos sem a utilizacao de adesivos ou tratamentos superficiais para aumentar a compatibilidade entre eles. Microtomografias de raios X, ensaios mecânicos e microscopia eletronica de varredura acoplada a um feixe ionico focalizado (SEM/FIB) permitiram verificar que, sob estresse mecânico e de intumescimento, os filmes rompem no interior permanecendo a interface entre eles fortemente conectada 
Abstract
Single-channel sinusoidally modulated visual-signal generator with variable temporal contrast (1993)

A novel technique is presented for sinusoidal temporal modulation of a light stimulus. The instrument consists of a linear polarizer, a quarter-wavelength retarder, and a rotating polarizer–analyzer. One advantage of using this technique over conventional single-channel polaroid techniques is that one can adjust the depth of modulation while maintaining a constant average intensity. Two separate and differing calculations are presented to show that the output is theoretically a pure sinusoid modulation in time, with a constant average intensity. Results of experimental verifications are included.
Estimation of absolute spatial position of mobile systems by hybrid opto-electronic processor (2003)

A mobile system with a hybrid opto-electronic processor has been studied. The position estimation is based on analysis of landmarks being detected by a TV-camera attached to the mobile system. The difference between the known real shape of the landmark and its image provides the information necessary for determining the relative position of the mobile system to the landmark. The parameters of the landmark image are extracted at high speed using an optical processor that performs an optical Hough transform, while the coordinates of the mobile system are computed from these parameters in a digital coprocessor using fast and simple algorithms. Different sources of errors have been analyzed, and algorithms to improve the performance of the mobile system have been developed and evaluated by computer simulation.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
Evidence for suppression of potassium conductance by noradrenaline in smooth muscle of guinea-pig vas deferens. (1986)

The ionic dependency was examined in the reversal potential of the NA-induced membrane depolarization of smooth muscle of the guinea-pig vas deferens, using the double sucrose-gap method. In the control (5.9 mM K) solution and solutions containing 20 and 60 mM K ions, replaced with equimolar amount of Na ions, the reversal potential was negative to the membrane potential at the steady state in each solution, by 19.5, 15.1 and 13.2 mV, respectively. Taking account that the higher external K concentration causes the larger membrane depolarization, these results indicate that the reversal potential shifted toward the positive direction as the external K concentration was increased. On the other hand, the calculated equilibrium potential of K ions in those solutions is -88, -52 and -24 mV, respectively. In those solutions, furthermore, the equilibrium potential of Na ions is 42, 38 and 29 mV, respectively. However, the equilibrium potentials of Ca and Cl ions should be unchanged. Therefore, it is suggested that the reversal potential of the NA-induced depolarization varied in the given different solutions compatibly only with the change in the K equilibrium potential. This provides evidence that in this tissue, NA induces a reduction in the K conductance of the cell membrane.
Analytical Verification of Blast Testing of Steel Frame Moment Connection Assemblies (2007)

Attacks on buildings in the United States over the past decade by terrorists have heightened concerns over the availability of proven technologies to economically design and construct multi-story buildings capable of mitigating progressive collapse when subjected to terrorist bomb blast. To resolve these concerns, and in recognition of the potential favorable relative economics of steel frame construction over reinforced concrete, the General Services Administration (GSA), Office of the Chief Architect, elected in 2004 to fund and conduct a first-ever, high-level blast and progressive collapse steel frame test program (the "GSA Test Program") to investigate the performance of conventional welded steel frame construction. Prior to 2004, GSA's progressive collapse guidelines for the design of steel frame buildings were based on analytical research only. The primary objectives of the GSA Test Program are five-fold: 1. To either validate or dispel, through actual testing and corroborative state-of-the-art analysis, the notion that reinforced concrete is preeminent over structural steel in mitigating the effects of bomb blast attack on conventional public structures. 2. To verify and validate analysis tools needed to conduct reliable blast and progressive collapse analyses in order to minimize the need for future costly and time-consuming full-scale testing. 3. To investigate the relative performance of contrasting steel frame beam-to-column connection types when subjected to the high strain rate effects of blast attack and subsequent impending progressive collapse conditions. 4. To identify steel frame beam-to-column connection systems that are reliable solutions for the mitigation of the effects of bomb blast, and the positive arrest of impending progressive collapse, for use by the GSA and other U.S. Federal government agencies. 5. To gain the knowledge necessary to modify, as necessary, a variety of steel frame connections types being used in the construction industry today, in order to be able to reliably and economically provide GSA's prescribed security expectations.
Evaluation of Fuel Preparation Systems for Lean Premixing-Prevaporizing Combustors (1986)

A series of tests was conducted to provide data for the design of premixing-prevaporizing fuel-air mixture preparation systems for aircraft gas turbine engine combustors. Fifteen configurations of four different fuel-air mixture preparation system design concepts were evaluated to determine fuel-air mixture uniformity at the system exit over a range of conditions representative of cruise operation for a modern commercial turbofan engine. Operating conditions, including pressure, temperature, fuel-air ratio, and velocity had no clear effect on mixture uniformity in systems which used low-pressure fuel injectors. However, performance of systems using pressure atomizing fuel nozzles and large-scale mixing devices was shown to be sensitive to operating conditions. Variations in system design variables were also evaluated and correlated. Mixture uniformity improved with increased system length, pressure drop, and number of fuel injection points per unit area. A premixing system compatible with the combustor envelope of a typical combustion system and capable of providing mixture nonuniformity (standard deviation/mean) below 15% over a typical range of cruise operating conditions was demonstrated.
Intrauterine Head Entrapment of a Second Twin by a Uterine Synechia (2003)

In Brief BACKGROUND Fetal head entrapment during delivery is a rare occurrence in modern obstetrics. We present a case of intrauterine head entrapment of a second twin by a uterine synechia diagnosed by ultrasound and subsequent complications that occurred. CASE A woman with a twin intrauterine pregnancy presented at 19 weeks for evaluation of a shortened cervix. Ultrasound examination demonstrated fetal head entrapment of twin B by a uterine synechia, as well as intrauterine growth restriction (IUGR). The patient experienced pre-term premature rupture of membranes at 24 weeks' gestation and underwent a cesarean delivery for a nonreassuring fetal heart rate tracing of twin B, with findings of a constricting band of fibrous tissue around the neck of twin B. CONCLUSION Uterine synechia might cause intrauterine head entrapment and IUGR. Uterine synechia might cause intrauterine head entrapment and intrauterine growth restriction and can be diagnosed by antenatal ultrasound.
Controlled batch fabrication of crystalline silicon nanobeam-based resonant structures (2011)

This work presents a self-controlled nano-precision top-down fabrication technique for batch fabrication of single crystalline silicon nanobeams and incorporation of such in electromechanical devices and systems. The fabrication technique takes advantage of the crystalline structure of silicon for the ultimate self-alignment and self-control leading to extremely smooth sidewalls, sharp corners, and controllable feature size reduction. Nanobeams with well uniform width as small as ~250 nm are fabricated on thin SOI substrates utilizing only conventional optical lithography with 2 μm resolution and anisotropic wet etching of silicon. Thermally actuated resonators using such nanobeams as thermal actuators/piezoresistive sensors have been successfully fabricated and characterized.
Changes in myofilament lattice spacing accounts for differences in systolic strains in Vinculin deficient mouse hearts (2012)

Vinculin has been previously shown to play a significant role in mechanotransduction and may affect myocardial mechanical function in a directionally‐dependent manner. Cardiac MRI tagging in a vinculin knockout (VclKO) mouse model revealed significant decreases in systolic sheet‐normal shear strain (P<0.05) and systolic sheet strain (P<0.05) in KO mice compared with littermate wildtype (WT) controls. We hypothesized that an increase in transverse systolic stress development may explain these observations, and changes in myofilament lattice spacing in the VclKO could alter systolic stress in the myocytes. Actin‐myosin lattice spacing was then measured and normalized to sarcomere length in barium‐contracted WT and VclKO hearts with values of 19.1±1.51 nm and 21.8±1.39 nm, respectively. These results were used as inputs in a structural model of crossbridge geometry similar to that of Schoenberg (1980), which showed a significant increase in the radial component of sacromere force in the VclKO compared with WT. The calculated distribution of forces was then used in a three‐dimensional finite element model in which end systolic sheet strains were predicted. The results matched the trends seen experimentally between the WT and VclKO mice. These results suggest that the change in systolic strains seen experimentally in the VclKO mice can be explained by the increase in lattice spacing seen in the knockout mice.
Discriminatory measures for speaker recognition (2002)

This paper investigates methods for incorporating discriminatory information into speaker recognition systems. In particular, this information is used to supplement non-discriminative modeling approaches, such as dynamic time warping and hidden Markov modeling. The discriminative information is obtained from the neural tree network (NTN) and is integrated with the non-discriminative models via data fusion. Here, the outputs of each model are combined with two data fusion methods know as the linear opinion pool and log opinion pool. These methods are evaluated for text dependent speaker verification for two databases. For both experiments, the consensus driven system outperformed the systems based on individual models.
ChemInform Abstract: Synthesis of Carbofunctional Silicon‐Containing Methyladamantanes. (1987)

Abstract The peroxide‐catalyzed reaction of 1,3‐dimethyladamantane (I) with the unsaturated silyl compounds (II) gives the addition products (III) and (IV).
Dissimilatory nitrogen reduction by soil fungal community members and their possible contribution to N2O production in soi (2015)

International audience
Bistriarylamine Polymer‐Based Composites for Photorefractive Applications (2004)

The development and performance of tetraphenyldiaminobiphenyl-based polymer composites with stable video-rate-compatible response times over large exposures is reported (see Figure). The high diffraction efficiency together with an exposure-history independence of the response time described is a significant advance for developing an all-organic photorefractive composite for device applications.
Aligned carbon nanotubes as polarization-sensitive, molecular near-field detectors (2009)

Near-field scanning optical microscopes are widely used in imaging of subwavelength features in various material systems and nanostructures. For a variety of applications, polarization-sensitive near-field probes can provide valuable information on the nature and symmetry of the imaged nanoparticles and emitters. Conventional near-field optical microscopy lacks in-plane polarization sensitivity. Here, we use aligned single-wall carbon nanotubes as polarization-sensitive molecular scale probes to image the transverse near-field components of an optical Hertzian dipole antenna. Because of the Raman "antenna effect" in carbon nanotubes, only the near-field components along the nanotube axis are detected. These findings demonstrate that aligned carbon nanotubes can be used as polarization-sensitive near-field detectors.
Photoinduced N2 loss as a route to long-lived organometallic alkane complexes: A time-resolved IR and NMR study (2010)

Photolysis of CpRe(CO)2(N2) in cyclopentane or 2,2-dimethylbutane with a UV lamp via a quartz fibre inserted into the NMR probe allows generation of CpRe(CO)2(cyclopentane) and CpRe(CO)2(2,2-dimethylbutane). The latter is observed in three isomeric forms according to the site of co-ordination to the rhenium. The major isomer, CpRe(CO)2(2,2-dimethylbutane-η2-C1,H1), exhibits a 1H NMR resonance for the co-ordinated hydrogen at δ = −2.19 with 1JC–H = 118 Hz. The photochemistry of Cp‡Re(CO)2(N2) (Cp‡ = η5-1,2-C5H3(tBu)2) in alkane solution is also reported. Two new organometallic alkane complexes, Cp‡Re(CO)2(alkane) (alkane = cyclopentane, n-heptane) have been characterized by IR spectroscopy following irradiation of Cp‡Re(CO)2(N2) and their rate constants for reaction with CO have been determined. The reaction with cyclopentane has also been studied by NMR spectroscopy at 190 K with in situ laser irradiation at 355 nm. Cp‡Re(CO)2(c-C5H10) is shown to exhibit the characteristic features of an alkane complex in the NMR spectrum, viz. a large isotopic shift of the 1H resonance at δ = −2.44 upon partial deuteration of the alkane (Δδ = 1.77 ppm), a large 1JC–H (114 Hz) and a large negative 13C chemical shift (δ = −33.8). We find no evidence for CO loss or agostic interactions of the t-butyl groups under these conditions. Cp‡Re(CO)2(alkane) has a slightly shorter lifetime (ca. 5x) than CpRe(CO)2(alkane) for a given alkane. Photolysis of CpRe(CO)2(N2) to form the organometallic alkane complex occurs with a much higher yield than for CpRe(CO)3. Efficient photo-ejection of N2 from Cp‡Re(CO)2(N2) is observed upon either 266 or 355 nm laser irradiation. A dinitrogen precursor allows for the use of longer wavelength irradiation and the generation of a higher concentration of the alkane complex following each laser pulse.
β<sub>1</sub>‐ and β<sub>2</sub>‐Adrenoceptor Affinity and Stimulatory Effects of (S)‐Pindolol and Iodinated (S)‐Pindolol (1987)

The beta 1- and beta 2-adrenoceptor affinity and stimulatory effects of iodinated (S)-pindolol (IPIN) and (S)-pindolol were investigated in vitro using beta-adrenoceptor binding technique and isolated right atrium (rate increase, beta 1) and uterus (relaxation, beta 2) of the rat. IPIN had a higher affinity towards beta-adrenoceptors compared to (S)-pindolol, with some beta 2-adrenoceptor selectivity. In the rat uterus, IPIN produced only marginal stimulatory effects, while (S)-pindolol caused a concentration-dependent relaxation with a maximal effect that was 55% of that generated by isoprenaline. In the right atrium IPIN caused an increase in the atrial rate similar to that caused by (S)-pindolol. The concentration of IPIN required in the right atrium for a half-maximal response (pD2 = 7.81) was markedly greater than that required for occupation of half the beta-adrenoceptor population (pKB = 9.81). The beta 1-selective blocker metoprolol antagonized the effect of (S)-pindolol and IPIN on the atrial rate but a greater concentration of metoprolol (5 X 10(-6) M compared with 5 X 10(-7) M) was required to antagonize the effect of IPIN significantly. It is concluded that iodination of (S)-pindolol increased its affinity and decreased its efficacy towards beta-adrenoceptors.
Genetic evidence that <i>Sil</i> is required for the sonic hedgehog response pathway (2001)

The Sil gene encodes a cytosolic protein required for mouse embryonic midline and left/right axial development. Based on the phenotype of Sil mutant embryos, we hypothesized that Sil may be required for the activity of Sonic Hedgehog (Shh), a secreted signaling molecule also critically important for the development of the embryonic axes and found mutated in multiple types of cancer. Here we tested the genetic interaction between Sil and the Shh pathway by generating and analyzing embryos carrying mutations in both Sil and Patched (Ptch), a Shh receptor that normally inhibits the signaling pathway in the absence of ligand and when mutated leads to constitutive activation of the pathway. We find that Sil(-/-) Ptch(-/-) embryos do not activate the Shh pathway and instead have a phenotype indistinguishable from Sil(-/-) embryos, in which there is a loss of activity of Shh. These results provide genetic evidence that Sil is an essential component of the Shh response, acting downstream to Ptch.
Technologie des Hautes Pressions (2005)

pour le champs 'auteurs', les Directeurs de publications apparaissent en premier puis le Directeur de collection.
Detection of “Mach Wave” Radiation of a Supersonic Jet (1974)

Recent measurements carried out in the farfield of a model supersonic jet using a highly directional microphone exhibit pressure signals of rather characteristic shapes. Randomly occurring high-amplitude positive peaks are followed by less intense negative values. Indeed, the measured probability distribution is highly skewed. It is conjectured that these signals are produced by the so-called Mach wave radiation of the jet. [This work has been supported by the Department of Transportation under Grant No. DOT-OS-00002.]
Gravity Effects on Fluid Front Dynamics during Mold Filling (2001)

The effect of gravity on free surface shape during the filling of a disk-shaped cavity is experimentally studied. A disk-shaped mold cavity is constructed to measure spreading of the fluid front due to gravity. Fluid front sensors are mounted on the top and bottom mold walls at three radial locations. The time the fluid front reaches these sensor locations is recorded. This data is used to calculate the radial distance between the top and bottom of the fluid front at each sensor location. The important parameters that govern the fluid front dynamics are identified as the Reynolds, Bond, and Capillary numbers. Spreading is found to be mainly dependent on the Bond number, such that a large change in spreading is observed due to a small change in Bond number. Spreading increases with decreasing Capillary number and remains nearly constant over the range of Reynolds numbers studied.
ISLET TRANSPLANTATION ALONE IN TYPE 1 DIABETES MELLITUS. (1999)

661 One of the main problems that limit the success of islet allotransplantation in patients with Type 1 diabetes mellitus is allograft rejection. New immunosuppressive modalities need to be evaluated to promote islet allograft survival. We have initiated our trial of islet transplantation alone under daclizumab (humanized anti-IL2 receptor monoclonal antibody), methylprednisolone, tacrolimus, and mycophenolate mofetil immunosuppression. A 40 year old woman with Type 1 diabetes mellitus of 33 years duration with retinopathy, neuropathy and normal kidney function (corrected Creatinine Clearance 79 ± 12 ml/min (n=3), Albumin 24 ±10 mg/24 hrs (n=3)), received 512,250 islets via a percutaneous transhepatic catheterization of the portal vein. CD34+ donor bone marrow derived cells (3 × 106/kg) were enriched by positive selection from vertebral bodies. The CD34+ enriched cell preparation was infused at days 5 and 11 post transplant. The results are summarized in the following table:TableThis patient has maintained stable islet allograft function for 3 months with normalization of HbA1c. Insulin requirements have decreased from 90 to 38 U during the first three months post transplant. Chimerism levels, both % of donor PBMC and CD34+, are higher than in our kidney-islet non-enriched donor bone marrow recipients (3.58% vs. 2.22% (n=5) and 1.4% vs. 0.75% (n=5), respectively) who received ATGAM or OKT3 induction. This immunosuppressive regimen prevented early islet allograft loss and resulted in hematopoietic chimerism that appears to be higher as compared to previous patients receiving simultaneous islet-kidney allograft and donor bone marrow infusions under conventional immunosuppression.
ChemInform Abstract: Synthesis and Biological Evaluation of the Glycoside (25R)‐3β,16β‐Diacetoxy‐22‐oxocholest‐5‐en‐26‐yl β‐D‐Glucopyranoside: A Selective Anticancer Agent in Cervicouterine Cell Lines. (2012)

Abstract The title compound (IV) shows selective antiproliferative activity against CaSki, ViBo, and HeLa cervicouterine cancer cell lines.