gebhart/patrepeval huggingface dataset:
Vertically oriented self-assembly of colloidal CdSe/CdZnS quantum wells controlled via hydrophilicity/lipophilicity balance: optical gain of quantum well stacks for amplified spontaneous emission and random lasing (2023)

We propose and demonstrate vertically oriented self-assembly of colloidal quantum wells (CQWs) that allows for stacking CdSe/CdZnS core/shell CQWs in films for the purposes of amplified spontaneous emission (ASE) and random lasing. Here, a monolayer of such CQW stacks is obtained <i>via</i> liquid-air interface self-assembly (LAISA) in a binary subphase by controlling the hydrophilicity/lipophilicity balance (HLB), a critical factor for maintaining the orientation of CQWs during their self-assembly. Ethylene glycol, as a hydrophilic subphase, orients the coalition of these CQWs into self-assembled multi-layers in the vertical direction. Stacking CQWs into large micron-sized areas as a monolayer is facilitated by adjusting HLB with diethylene glycol addition as a more lyophilic subphase during LAISA. ASE was observed from the resulting multi-layered CQW stacks prepared <i>via</i> sequential deposition onto the substrate by applying the Langmuir-Schaefer transfer method. Random lasing was achieved from a single self-assembled monolayer of the vertically oriented CQWs. Here, highly rough surfaces resulting from the non-close packing nature of the CQW stack films cause strongly thickness-dependent behavior. We observed that in general a higher roughness-to-thickness ratio of the CQW stack films (<i>e.g.</i>, thinner films that are intrinsically rough enough) leads to random lasing, while it is possible to observe ASE only in thick enough films even if their roughness is relatively higher. These findings indicate that the proposed bottom-up technique can be used to construct thickness-tunable, three-dimensional CQW superstructures for fast, low-cost, and large-area fabrication.
I2-mediated regioselective C-3 azidation of indoles (2016)

An unprecedented synthesis of novel 3-azido indoles has been developed using I2 and NaN3 in high yields and excellent regioselectivity. The reaction proceeds under metal-free conditions at room temperature. Essentially, an umpolung in reactivity at the C-3 position of indole has been achieved by the activation of indoles with I2.
Screening Low-Frequency SNPS From Genome-Wide Association Study Reveals a New Risk Allele for Progression to AIDS (2010)

Besides the already known chromosome 6 associations, the analysis of low-frequency SNPs brought up a new association in the RICH2 gene. Interestingly, RICH2 interacts with BST-2 known to be a major restriction factor for HIV-1 infection. Our study has thus identified a new candidate gene for AIDS molecular etiology and confirms the interest of singling out low-frequency SNPs to exploit GWAS data.
Recovery for extended transaction models (1997)

Introduction The transaction has emerged as an important paradigm for building reliable distributed information systems [5, 1]. Its success stems from its ability to hide the problems of concurrency and failure from both the application programmer and the end user. The atomic transaction model defines simple, flat transactions that guarantee the execution properties of atomicity, consistency, isolation, and durability. Transaction processing support for atomic transactions has been well-studied and has been implemented in all commercial database systems. In this abstract, we summarize our work on recovery for extended transaction models [2]. Our goal is to build flexible and efficient recovery systems to support extended transactions by extending existing atomic TP systems. We have developed a design methodology that takes as input a formal description of an extended transaction model and produces as output a recovery system design that can be readily implemented through modular exte
ESR studies of hydrogenated nanocrystalline silicon carbide (2003)

Thin films of the intrinsic hydrogenated nanocrystalline silicon carbide (i-nc-SiC:H) with different crystalline content were prepared using mercury-sensitized photo-CVD technique and characterized by Raman and XRD measurements. The dark conductivity temperature dependent measurements indicated the thermally activated transport. Spin defect densities were studied by ESR measurements. A broad (2 mT) ESR resonance line with g-factor around g=2.007 was detected. With carbon content increase DB density decreases from N/sub S//spl sim/10/sup 19/cm/sup -3/ to around 10/sup 18/cm/sup -3/. It was found that the defect concentration and electronic properties of the films are mainly controlled by film crystallinity hindering with carbon content increase.
A Concise Route to MK-4482 (EIDD-2801) (2020)

A two-step route to MK-4482 (EIDD-2801, 1) was developed consisting of an esterification and hydroxamination of cytidine. The reactions can be conducted in either order with overall yields of 67% (first step—esterification) and 37% (first step—hydroxamination). Selective esterification of the nucleoside’s primary alcohol by enzymatic means eliminated the need for diol protection/deprotection, and direct transamination with hydroxylamine precluded the necessity of activating the nucleobase for amine coupling. This results in a significant advancement over the reported synthesis which is formed in at best 17% yield. The step count is reduced from five transformation to two, and the more expensive uridine is replaced with the more available cytidine.
Systemic mastocytosis emerging after azacitidine treatment of refractory anaemia with excess blasts type 2 (2014)

A 73-year-old man was investigated for a pancytopenia of recent onset. He had no skin lesions, lymphadenopathy or splenomegaly. A full blood count showed a haemoglobin concentration of 94 g/l, neutrophil count of 0·76 × 109/l and platelet count of 40 × 109/l. A bone marrow aspirate showed a hypercelluar marrow with left shifted granulopoiesis and an increased proportion of promyelocytes and myelocytes; a subset of myeloid precursors and mature neutrophils had dysplastic features with hypogranular cytoplasm. There were 17% blast cells, which were intermediate to large in size, with scanty blue agranular cytoplasm and round nuclei that had open reticular chromatin and prominent nucleoli (left); the blast cells were CD34 positive. A diagnosis of refractory anaemia with excess of blasts type 2 (RAEB-2) was made. The patient was treated with azacitidine using a standard protocol for high risk myelodysplastic syndrome (MDS). He responded initially with improved blood counts but clinically became worse. Another bone marrow aspirate performed 5 months later, when neutropenia had resolved, remained hypercellular with a moderate reduction in blast cells (to 9%); new findings were increased mast cells (9%) and eosinophils (18%). Computerized tomography of the abdomen and pelvis demonstrated ascites and splenomegaly that had not been present at diagnosis. Azacitidine treatment was withheld. Another bone marrow apirate 1 month later showed increased abnormal, spindle-shaped mast cells (13%) (right), blasts (3%) and eosinophils (5%). Trephine biopsy demonstrated aggregates of spindle-shaped mast cells in a paratrabecular/multi-focal distribution. Immunohistochemistry showed expression of CD117, tryptase and CD25, while CD34 was negative, confirming these as neoplastic mast cells. Investigation was positive for both the rare KIT D816H mutation, previously reported in a case of systemic mastocytosis (SM) with acute myeloid leukaemia, and KIT K818R, not previously reported in SM. Serum tryptase was elevated to >200 ng/ml. Thus, our patient met the major criteria and all four minor criteria for a diagnosis of SM. CD117, CD25 and tryptase applied to the original biopsy specimen showed no evidence of SM. A diagnosis of systemic mastocytosis with associated clonal haematological non-mast cell disease (SM-AHNMD) was made. The patient deteriorated and died within weeks. SM-AHNMD is the second most common variant of SM, accounting for 40% of all cases of SM. SM-MDS is uncommon and our case is very unusual as SM emerged only after the patient showed a response to azacitidine treatment for high risk MDS. Clonal identity of the two neoplasms was not investigated, and one can only speculate that the pressure of medication could have altered the direction of differentiation of a pluripotent haemopoietic stem cell.
Near-field imaging of light propagation in photonic crystal waveguides: Explicit role of Bloch harmonics (2002)

We employ a collection scanning near-field optical microscope (SNOM) to image the propagation of light at telecommunication wavelengths along straight and bent regions of silicon-on-insulator photonic crystal waveguides (PCWs) formed by removing a single row of holes in the triangular 410-nm-period lattice along the $\ensuremath{\Gamma}M$ direction of the irreducible Brillouin zone. We obtain high quality SNOM images of PCWs excited in the wavelength range of 1520--1570 nm, which indicate good PCW mode confinement and low propagation loss. Using averaged cross sections of the intensity distributions before and after PCW bends, bend loss is evaluated and found to noticeably increase with the increase of the light wavelength from \ensuremath{\sim}1 dB at 1520 nm to \ensuremath{\sim}6 dB at 1570 nm. We analyze light intensity variations along PCWs measured with the SNOM at different distances from the sample surface. Considering the interference between a quasihomogeneous background field and Bloch harmonics of the PCW mode, we account for spatial frequency spectra of the intensity variations and determine the propagation constant of the PCW mode at 1520 nm. The possibilities and limitations of SNOM imaging for the characterization of PCWs are discussed.
Development and Validation of Risk Adjustment Models for Long-Term Mortality and Myocardial Infarction Following Percutaneous Coronary Interventions (2010)

Easily obtainable variables can be combined into a convenient risk scoring system at the time of patient dismissal following PCI to accurately predict long-term mortality and mortality/MI. This model may be useful for providing patients with individualized, evidence-based estimates of long-term risk.
Using optimistic atomic broadcast in transaction processing systems (2003)

Atomic broadcast primitives are often proposed as a mechanism to allow fault-tolerant cooperation between sites in a distributed system. Unfortunately, the delay incurred before a message can be delivered makes it difficult to implement high performance, scalable applications on top of atomic broadcast primitives. Recently, a new approach has been proposed for atomic broadcast which, based on optimistic assumptions about the communication system, reduces the average delay for message delivery to the application. We develop this idea further and show how applications can take even more advantage of the optimistic assumption by overlapping the coordination phase of the atomic broadcast algorithm with the processing of delivered messages. In particular, we present a replicated database architecture that employs the new atomic broadcast primitive in such a way that communication and transaction processing are fully overlapped, providing high performance without relaxing transaction correctness.
Dendritic pathology and neuronal injury induced by Tat and opiates in a transgenic model of HIV‐1 encephalitis (2008)

To assess the mechanisms by which opiate abuse exacerbates HIV‐1 encephalitis (HIVE), morphine (5 mg/day) and/or naltrexone (6 mg/day) were administered via s.c. implant to wild type or transgenic (tg) mice expressing Tat 1–86 regulated by a doxycycline‐inducible glial fibrillary acidic protein (GFAP) promoter. Tat induction or morphine exposure significantly increased the proportion of cleaved caspase−3 immunoreactive, but not TUNEL reactive, striatal neurons at 2 d. Despite increases in caspase−3 detection, neuron numbers appeared stable at 2 and 7 d. Instead, Tat induction or morphine exposure caused marked reductions in dendritic length and spine density (Golgi‐impregnated medium spiny neurons) at 7 d. When total spine losses are considered, combined Tat induction and morphine caused additive reductions in dendritic complexity. Neuronal injury was accompanied by significant increases in glial activation (assessed by increased GFAP and F4/80 immunoreactive astrocytes and macrophages/microglia, respectively) and proinflammatory chemokines (RANTES and MCP‐1). The effects of morphine were prevented by naltrexone. Our findings suggest that HIV‐1 Tat and chronic opiates contribute to the neurocognitive defects in neuroAIDS through interactive, non‐lethal reductions in dendritic length and spine density. Support: DA19398, DA18633.
Sulfated Steroids: Ptilosteroids A−C and Ptilosaponosides A and B from the Solomon Islands Marine Sponge Ptilocaulis spiculifer (2009)

Three new pregnanes, ptilosteroid A (1), ptilosteroid B (2), and ptilosteroid C (3), and two new pregnane glycosides, ptilosaponoside A (4) and ptilosaponoside B (5), were isolated from the marine sponge Ptilocaulis spiculifer collected in the Solomon Islands. The structures were determined by spectroscopic methods. Biological tests of these compounds showed that they are not cytotoxic against KB cells.
State estimation for deformable objects by point registration and dynamic simulation (2017)

To enhance the robotic manipulation of deformable objects, a robust state estimator is proposed to track the object configuration in real time. A Gaussian mixture model (GMM) is constructed to register the object nodes towards the noisy point cloud. To deal with occlusion, the coherent point drift (CPD) regularization is applied on the mixture model, so as to maintain the topological structure from previous sequences of data and to infer the object states in occluded area. The state estimation is further refined by running a dynamic simulation in parallel, which guarantees the estimates to satisfy the object's physical constraints. A series of rope tracking experiments are performed to evaluate the proposed state estimator. It is shown that the object can be tracked robustly with sensor noise, outliers and massive occlusion.
Coexistence of Filamentary and Homogeneous Resistive Switching in Fe‐Doped SrTiO3 Thin‐Film Memristive Devices (2010)

Conductive atomic force microscopy combined with a delamination technique is used to remove the top electrode of Fe-doped SrTiO3 metal–insulator–metal structures and gain insight into the active switching interface. Both a filamentary and an area-dependent switching process with opposite switching polarities are found in the same sample. Detailed facts of importance to specialist readers are published as ”Supporting Information”. Such documents are peer-reviewed, but not copy-edited or typeset. They are made available as submitted by the authors. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.
Rheology of Thermoreversible Hydrogels from Multiblock Associating Copolymers (2008)

Multiblock copolymers of poly(ethylene oxide)99-poly(propylene oxide)67-poly(ethylene oxide)99 (F127) were synthesized by chain extending with hexamethylene diisocyanate (HDI). The resulting multiblock copolymer poly-F127 maintained the thermoreversible properties of the original F127 triblock copolymer. The rheological and structural properties of the gels were characterized as a function of temperature, composition and degree of polymerization. Neutron scattering reveals that a large degree of alignment can be induced in the F127 gel, but no long-range order could be found in the multiblocks or the mixtures of F127 with multiblocks. The shear strain at yield in polymers having an average of 3.2 or more F127 repeats was nearly an order of magnitude higher than in the F127 gel. For F127 solutions just below their gel point, substitution of F127 with as little as 1% multiblock succeeded in forming a physical gel. Percolation theory was used to understand the modulus growth when multiblock was added to F127 solutions just below their gel point, assuming the multiblocks form bridges between adjacent micelles.
A new synthetic route to polycarbonate (1979)

Abstract A detailed study has been carried out on the new synthetic reaction of poly( p ‐xylylene carbonate) from potassium carbonate and p ‐xylylene dibromide by using a variety of crown ethers as a catalyst, which was recently found by the present authors. Crown ethers having 18‐member ring showed the best catalytic property of the various crown ethers, and the reaction was conducted in various solvents at 50–160°C by using 18‐crown‐6‐ether. Both the polymer yield and the molecular weight of the polymer increased in proportion to the amount of potassium carbonate, and they increased rapidly and reached constant values with increasing the concentration of 18‐crown‐6‐ether. They also depended significantly upon the reaction temperature as well as the solvent used. A maximum yield with the highest molecular weight was obtained from the reaction at 100–120°C in diglyme solvent. The spectroscopic analysis of the polymer indicated that all the end groups of the resulting polymer had the structure of benzyl bromide. From these results, a plausible mechanism was proposed for the reaction. Similar reactions were also conducted by using several aliphatic dibromides, Br(CH 2 ) x Br, in place of p ‐xylylene dibromide. The products were strongly dependent of the value of x : polycarbonate was obtained from dibromides with ≧4, and cyclic carbonates from dibromides with ≦3.
Mechanical Properties of La0.6Sr0.4Co1-yFeyO3-δ under Various Temperatures and Oxygen Partial Pressures (2011)

Young's modulus, shear modulus, Poisson's ratio and internal friction of La0.6Sr0.4CoO3-δ (LSC) and La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF6428) were evaluated in the temperature range between 298 to 1173 K, and the oxygen partial pressure, P(O2), range between 1 x 10-1 to 1 x 10-4 bar using the resonance method. The apparent Young's moduli of LSC and LSCF6428 first decreased with increasing temperature, and then drastically increased at intermediate temperatures. P(O2) dependence of the Young's modulus of LSCF6428 showed different trends depending on temperature. At 873K, the Young's modulus was almost independent of P(O2), while it increased with decreasing P(O2) at 973 K. At 1073 K, it increased down to 5 ×10-3 bar and then decreased in further lower P(O2). At 1173K, it decreased with decreasing P(O2). Such complicated temperature and P(O2) dependences are considered as composite phenomena caused by the lattice expansion/shrinkage, the oxygen nonstoichiometry change, and the phase transition.
Macroergonomic Principles of Automated Performance Measurement (2006)

Retail associate productivity has increased dramatically over the last 15 years with the use of ever more sophisticated scanners and point of sale (POS) terminals. Data warehouses enable businesses to store remarkable detail about each transaction. Analyses of these data tend to focus on the items sold and money collected. However, if these systems also collect timestamp data of important events during transactions retailers would then have the basis for measuring associate activity. This paper discusses the macroergonomic principles that must guide the design of cashier performance measurement systems in the retail setting. Following these guidelines leads not only to increased manager effectiveness, but also to more accurate measurement of activity. It can also improve associates morale and the likelihood of incenting desirable and productive behaviors. These principles are generalizable to other domains in which automated performance measurement takes place.
Dynamic mechanical properties of photopolymerizable poly(vinyl alcohol)–acrylate monomer blends (1983)

Abstract Dynamic mechanical properties of photopolymerizable poly(vinyl alcohol) (PVA)–monoacrylate blends were investigated by measuring dynamic shear modulus G ′ and loss tangent, tan δ. The dynamic mechanical properties of the blends before being exposed to UV irradiation were governed by the weight percent of the monomers which act as plasticizers. On the other hand, the UV‐irradiated blends seemed to be typical two‐phase materials since they revealed two tan δ maxima whose positions were independent of the monomer content. Those two maxima were assigned to PVA and photopolymerized acrylates with reference to the dynamic mechanical data of PVA and a PVA‐polyacrylamide polyblend. Those dynamic mechanical data suggested that insolubilization of the blend type photopolymers should be caused by a decrease in solubility due to graft polymerization of acrylate monomers onto PVA.
Tracking control for industrial robot using notch filtering system with little phase error (2011)

Abstract This paper proposes a new method for generation of a position reference that has both vibration suppression performance and fast tracking performance for industrial robots. It is important for industrial robots to drive at high speed and with high accuracy. In such cases, vibration is generated. Conventionally, the notch filter is used in order to reduce vibration. It is able to eliminate the natural frequency component, but a reference phase error is generated. The reference phase error causes locus error in the robot. Therefore, the accuracy of the robot is degraded by using a notch filter. The proposed method overcomes this problem by using the compensation gain. The proposed compensation gain is used in order to calculate the reference phase error. Compensation of the reference phase error is attained by feedforward input. Numerical and the experimental results confirm that the proposed method is valid for reducing vibration phenomena and that it decreases the phase error. © 2011 Wiley Periodicals, Inc. Electr Eng Jpn, 175(1): 53–63, 2011; Published online in Wiley Online Library ( wileyonlinelibrary.com ). DOI 10.1002/eej.20931
Total syntheses of (.+-.)-.alpha.- and (.+-.)-.beta.-copaene and formal total syntheses of (.+-.)-sativene, (.+-.)-cis-Sativenediol, and (.+-.)-helminthosporal (1992)

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTotal syntheses of (.+-.)-.alpha.- and (.+-.)-.beta.-copaene and formal total syntheses of (.+-.)-sativene, (.+-.)-cis-Sativenediol, and (.+-.)-helminthosporalErnest Wenkert, Brett C. Bookser, and Thomas S. ArrheniusCite this: J. Am. Chem. Soc. 1992, 114, 2, 644–654Publication Date (Print):January 1, 1992Publication History Published online1 May 2002Published inissue 1 January 1992https://pubs.acs.org/doi/10.1021/ja00028a034https://doi.org/10.1021/ja00028a034research-articleACS PublicationsRequest reuse permissionsArticle Views1375Altmetric-Citations31LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-Alertsclose Get e-Alerts