gebhart/patrepeval huggingface dataset:
Dual-Frequency and Dual-Polarization Microstrip Antennas for SAR Applications (1998)

This paper discusses various methods of implementing a shared-aperture dual-frequency dual-polarized array antenna for spaced-based synthetic aperture radar (SAR) applications. After evaluating the use of several potential array architecture concepts and radiating elements, a design using interlaced C-band microstrip patches and X-band printed slot elements was chosen as the best choice for the present system requirements. Layout considerations for the two arrays and their associated feed networks are addressed in terms of a practical design. A dual-frequency (C- and X-band), dual-linear polarized SAR array antenna prototype was designed, fabricated, and tested. The principal goal of this effort was to demonstrate the viability of the dual-band dual-polarized array concept, and this has been accomplished. Test results are shown with good correlation between measured and predicted results, validating the design approach used. This work demonstrates that a dual-frequency dual-polarization SAR antenna within a single aperture is a feasible approach to meeting user requirements in future SAR spacecraft.
Dynamic Scale-out Mechanisms for Partitioned Shared-Nothing Databases (2011)

For a database system used in pay-per-use cloud environments, elastic scaling becomes an essential feature, allowing for minimizing costs while accommodating fluctuations of load. One approach to scalability involves horizontal database partitioning and dynamic migration of partitions between servers. We define a scale-out operation as a combination of provisioning a new server followed by migration of one or more partitions to the newly-allocated server. &#13;\nIn this thesis we study the efficiency of different implementations of the scale-out operation in the context of online transaction processing (OLTP) workloads. We designed and implemented three migration mechanisms featuring different strategies for data transfer. The first one is based on a modification of the Xen hypervisor, Snowflock, and uses on-demand block transfers for both server provisioning and partition migration. The second one is implemented in a database management system (DBMS) and uses bulk transfers for partition migration, optimized for higher bandwidth utilization. The third one is a conventional application, using SQL commands to copy partitions between servers.&#13;\nWe perform an experimental comparison of those scale-out mechanisms for disk-bound and CPU-bound configurations. When comparing the mechanisms we analyze their impact on whole-system performance and on the experience of individual clients.
Heterocyclic organotellurium compounds as precursors for new organometallic derivatives of rhodium (1997)

The reaction of the pentamethylcyclopentadienylrhodium(III) dichloride dimer, [{Rh(η-C 5 Me 5 )Cl 2 } 2 ], with tellurophene in the presence of Ag(O 3 SCF 3 ) afforded the expected [Rh(η-C 5 Me 5 )(η 5 -C 4 H 4 Te)][O 3 SCF 3 ] 2 1 which on reaction with [Co(cp) 2 ] (cp = η-C 5 H 5 ) gives a rhodacyclic material [Rh(η-C 5 Me 5 ){η 5 -C 5 H 4 Rh(η-C 5 Me 5 )}] 2. The reaction of 2 with [Fe 3 (CO) 12 ] gave [Rh(η-C 5 Me 5 ){η 5 -C 4 H 4 Fe(CO) 3 }] 3. The reaction of [{Rh(η-C 5 Me 5 )Cl 2 } 2 ] with dibenzotellurophene, dbt, in the presence of Ag(O 3 SCF 3 ) gives [Rh(η-C 5 Me 5 )(dbt)][O 3 SCF 3 ] 2 4, in which the mode of coordination of dbt in CDCl 3 solution appears to be η 1 . The reaction of 4 with [Co(cp) 2 ] and [Fe 3 (CO) 12 ] gave a variety of products including [Rh(η-C 5 Me 5 )(C 12 H 8 )( η 1 -dbt)] 5, a known dibenzoferrole, 6, and compound 7 in which the η 1 -dbt of 5 is substituted by CO. Also isolated were the known [{Fe(η-C 5 Me 5 )(CO) 2 } 2 ] 8 and FeTe. The direct reaction of [{Rh(η-C 5 Me 5 )Cl 2 } 2 ] and dbt gave [Rh(η-C 5 Me 5 )Cl 2 (η 1 -dbt)]. Two complexes of 2-telluraindane were synthesized for comparison, [Rh(η-C 5 Me 5 )(C 8 H 8 Te)][O 3 SCF 3 ] 2 10 and [Rh(η-C 5 Me 5 )Cl 2 (C 8 H 8 Te)] 11 the latter showing fluxionality about co-ordinated tellurium at room temperature. It is suggested that the magnitude of J ( 125 Te– 103 Rh) has the potential to differentiate the modes of co-ordination of heterocyclic tellurium compounds to rhodium. The crystal and molecular structures have been determined for compounds 5, 7 and 9.
A new configuration of the Zeiss LSM 510 for simultaneous optical separation of green and red fluorescent protein pairs (2006)

The power and simplicity of genetically encoded fluorophores (fluorescent proteins, FPs) have drawn many molecular biologists to light microscopy. First generation FPs suffered from overlapping excitation and emission spectra, which limited their use together in pairs (Patterson et al., J Cell Sci 2001;114 (Part 5):837-838). Image acquisition and processing techniques, collectively known as linear unmixing, have been developed to separate overlapping fluorescence signals encountered in the imaging of FP pairs and also in FRET. These specialized techniques are not without their potential drawbacks, including limitations on sensitivity and time-resolution for live cell imaging, and the risk of artifact in the hands of nonspecialists. With the advent of a new generation of red-shifted FPs (Shaner et al., Nat Biotechnol 2004;22:1567-1572; Verkhusha and Lukyanov, Nat Biotechnol 2004;22:289-296) careful selection of excitation sources and emission filters obviate the need for linear unmixing when simple two channel imaging of FPs is required. Here we introduce a new configuration of the Zeiss LSM 510 laser scanning confocal microscope, optimized for live cell imaging of green fluorescent protein (GFP) together with spectral variants such as mRFP1 and mCherry using standard photo-multipliers. A 2 mW, 594 nm HeNe laser was chosen as the excitation source for the red FP. This wavelength efficiently excites the aforementioned red variants without limiting the detection range of GFP emission during simultaneous two-channel imaging. Compared to excitation of GFP and mCherry at 488 and 543 nm, excitation at 488 and 594 nm approximately doubles the sensitivity of GFP detection and eliminates bleed-through of GFP into the mCherry channel. However, sensitivity of mCherry detection is decreased by 30%, suggesting the need for red FPs having longer emission peaks. Practical advantages to the simultaneous optical separation of FPs with nonoverlapping emission spectra include simplicity, robustness, reduced risk of artifact, and increased sensitivity during live cell imaging.
CYTOKINE PRODUCTION BY CELL CULTURES FROM BRONCHIAL SUBEPITHELIAL MYOFIBROBLASTS (1996)

Myofibroblasts have been previously described beneath the bronchial epithelium and were found to increase in number proportional to the accumulation of extracellular matrix in the bronchial lamina reticularis in asthma. The aim of this study was to assess further the contribution of these structural cells to allergic inflammation in the bronchial mucosa through their cytokine expression. Cell cultures were established from the lamina reticularis of human bronchial biopsies from asthmatic and non-asthmatic subjects. Cytokine secretion was measured by ELISA in supernatants of cultures with or without tumour necrosis factor-alpha (TNF-alpha). The mRNA levels for granulocyte-macrophage colony-stimulating factor (GM-CSF) in the cultures were examined by ribonuclease protection assays (RPAs). Bronchial myofibroblasts grown from bronchial biopsies were capable of producing GM-CSF, interleukin-6 (IL-6), interleukin-8 (IL-8), and stem cell factor (SCF) constitutively. The GM-CSF production by myofibroblasts was significantly increased in response to TNF-alpha simulation with a corresponding increase in GM-CSF mRNA expression. The enhancement of GM-CSF production by TNF-alpha in myofibroblasts was blocked by the inhibition of RNA synthesis. Prednisolone abolished the GM-CSF production. This study provides evidence for the role of bronchial myofibroblasts in the regulation of inflammatory cell recruitment and activation by interaction in the cytokine network in the bronchial mucosa.
A Convenient Synthesis and a NMR Study of the Diammoniate of Diborane (2012)

DADB synthesis: The diammoniate of diborane (DADB) was synthesized in a new metathesis reaction between the diammoniate of monochloroborane and potassium borohydride in liquid ammonia. (1)H and (11)B NMR spectra of DADB are reported. The stability in THF was examined by variable-temperature (11)B NMR spectroscopy.
Electrical predistortion to compensate for combined effect of laser chirp and fibre dispersion (1991)

It is shown that laser chirp causes significant nonlinear distortions in the RF domain of analogue subcarrier systems in dispersive fibre links. The effect can be consideredly reduced using the electrical compensation circuits shown.
Sox6 Directly Silences Epsilon Globin Expression in Definitive Erythropoiesis (2006)

Sox6 is a member of the Sox transcription factor family that is defined by the conserved high mobility group (HMG) DNA binding domain, first described in the testis determining gene, Sry. Previous studies have suggested that Sox6 plays a role in the development of the central nervous system, cartilage, and muscle. In the Sox6-deficient mouse, p100H, epsilony globin is persistently expressed, and increased numbers of nucleated red cells are present in the fetal circulation. Transfection assays in GM979 (erythroleukemic) cells define a 36-base pair region of the epsilony proximal promoter that is critical for Sox6 mediated repression. Electrophoretic mobility shift assay (EMSA) and chromatin immunoprecipitation (ChIP) assays demonstrate that Sox6 acts as a repressor by directly binding to the epsilony promoter. The normal expression of Sox6 in wild-type fetal liver and the ectopic expression of epsilony in p100H homozygous fetal liver demonstrate that Sox6 functions in definitive erythropoiesis. The present study shows that Sox6 is required for silencing of epsilony globin in definitive erythropoiesis and suggests a role for Sox6 in erythroid cell maturation. Thus, Sox6 regulation of epsilony globin might provide a novel therapeutical target in the treatment of hemoglobinopathies such as sickle cell anemia and thalassemia.
PIK3CA Activating Mutations in Facial Infiltrating Lipomatosis (2013)

INTRODUCTION: Facial infiltrating lipomatosis (FIL) is a rare, congenital, non-heritable, disorder characterized by hemifacial soft-tissue and skeletal overgrowth, precocious dental development, macrodontia, hemimacroglossia, and mucosal neuromas. It has been hypothesized that FIL is caused by a somatic mutation, with regional expression, that arose during embryonic development. The purpose of this study was to search for causative somatic mutations in patients with FIL by using massively parallel sequencing. METHODS: Human FIL tissue was obtained prospectively from 6 patients during a clinically-indicated procedure and stored frozen. DNA was extracted from these specimens to produce massively parallel sequencing libraries that were enriched for coding sequences from genes involved in pathways that control cell growth using targeted capture. We massively parallel sequenced the enriched libraries and analyzed the sequence data for mutations that appeared to be mosaic and unique to the affected tissue. RESULTS: We identified a different missense mutation in PIK3CA in each patient’s affected tissue. Two patients had a nucleotide transition that changed a histidine to an arginine codon at the amino acid residue 1047 (p.H1047R), the other patients had different amino acid mutations: p.H1047L, p.E453K, or p.E542K. Each mutation is predicted to significantly increase enzymatic activity. Filtering reduced the fraction of targeted basepairs containing variant reads to ~0.008%, which enabled us to identify causal missense mutations in each affected tissue sample. The frequency of mutant cells in the affected tissue ranged from 12% to 68%, compatible with their representing somatic mosaic rather than germline mutations. CONCLUSION: Affected tissue from individuals with facial infiltrating lipomatosis contains PIK3CA mutations that have previously been reported in cancers and in affected tissue from other non-heritable, overgrowth disorders including CLOVES syndrome, Klippel-Trenaunay syndrome, hemimegalancephaly, fibroadipose overgrowth, and macrodactyly. Because PIK3CA encodes a catalytic subunit of PI3K, and in vitro studies have shown that the overgrowth-associated mutations increase this enzyme’s activity, PI3K inhibitors currently in clinical trials for patients with cancer may have a therapeutic role in patients with facial infiltrating lipomatosis. The strategy we employed to identify somatic mutations in patients with facial infiltrating lipomatosis is applicable to other somatic mosaic disorders that have allelic heterogeneity.
Homogeneous Vanadium‐Based Catalysts for the Ziegler—Natta Polymerization of α‐Olefins (2003)

Abstract For Abstract see ChemInform Abstract in Full Text.
Thin film flexible electrodes based on gold/polytetrafluoroethylene layers (2002)

Thin film gold electrodes on flexible Polytetrafluoroethylene (PTFE) substrates are produced for medical implantation. The electrical interface impedance of the electrodes is measured in vitro as a function of surface roughness of the gold as quantified using atomic force microscopy. Alternating current (AC) impedance measurements show a linear relationship between the reactive component of the impedance and the surface roughness. Surface features below 42 nm root mean square deviation from the average surface height are shown to result in a reduction in interface impedance and improved impedance matching to a 1% NaCl solution. The surface roughness of the gold is controlled using an electrolytic etch in a NaCl solution allowing the electrical characteristics of the interface to be influenced. Plasma modification of the PTFE substrate is seen to increase the surface energy by changing the chemical nature of the polymer and lead to enhanced adhesion of the gold layers. Applications of such techniques are expected to improve the current design of physiological signal sensors as well as enhance the reproducibility of biosensing devices.
Appling Link Target Identification and Content Extraction to improve Web News Summarization (2016)

The existing automatic text summarization systems whenever applied to web-pages of news articles show poor performance as the text is encapsulated within a HTML page. This paper takes advantage of the link identification and content extraction techniques. The results show the validity of such a strategy.
Diversity‐Oriented Synthesis of Polycyclic Scaffolds by Modification of an Anodic Product Derived from 2,4‐Dimethylphenol (2011)

Like a Swiss army knife: The pentacycle shown, which results from the anodic oxidation of 2,4-dimethylphenol, displays a wealth of potential reactivity. Depending on the applied reaction conditions a variey of polycyclic architectures are obtained with impressive stereo-, regio-, and chemoselectivity.
The Asymmetric, Dual-Michelson Wavefront Corrector: High Precision Correction of Amplitude and Phase for Coronagraphy (2004)

To detect extra-solar planets by coronography will require unprecedented levels of wavefront correction of both phase and amplitude. To achieve this, we propose a dual Michelson interferometer arrangement, incorporating two deformable mirrors (DM) and a third, fixed mirror (all at pupils) and two beamsplitters: one with unequal (asymmetric) beam splitting and one with symmetric beamsplitting. This design allows high precision correction of phase and amplitude using DMs with relatively coarse steps and is relatively insensitive to small changes in the DMs. We are constructing such an apparatus incorporating two MEMS devices and will report on features of the design and performance.
A Catalyst Free Synthesis and In Vitro Antimicrobial Studies of a Series of Bis-Schiff Bases (2013)

A series of bis-Schiff bases (3a-l) has been synthesized by condensation of substituted hydrazones (1a-l) with 3,5-dibromosalicylaldehyde (2) at room temperature within a short period of time under catalytic free conditions. The chemical structures of the synthesized compounds were confirmed on the basis of spectral analysis data. The bis-Schiff base derivatives (3a-l) were further screened for their in vitro antibacterial activity against plant, human pathogenic bacteria (Erwinia carotovora, Xanthomonas citri, Proteus vulgaris, Staphylococcus aureus) and antifungal (Alternaria and Curvularia lunata) studies. Compounds (3a-l) showed promising activities against S. aureus and Proteus vulgaris.
A modified poisson distribution for smartphone background traffic in cellular networks (2016)

Summary For the emerging applications such as Google Talk, Facebook, Skype and QQ, to mention a few, which run on smartphones, background traffic has become one of the significant issues in system design and optimization. Because of the complicated user behavior and interaction, the assumptions underlying the Poisson process model cannot be met; the Poisson distribution cannot approximate the distribution of background traffic arrivals accurately. In this paper, we propose a model, which can better fit the background traffic arrivals of smartphones than the Poisson distribution. The proposed model is a linear transformation of the Poisson distribution and is specified by three parameters, ( a , b , λ ), which can be estimated from the measured sample's mean, variance, and third central moment. Simulation results have corroborated the fitness of the proposed model in both single and mixed applications scenarios. In addition, we have also observed that the normalized parameters, ( a , b 0 , λ 0 ), of each application is independent of the user number and completely characterized by the type of application. Hence, with the given trace cumulative distribution functions of all applications, the proposed modified Poisson distribution can be used as a tool for modeling and analyzing background traffic arrivals with arbitrary user numbers and mixed applications. Copyright © 2016 John Wiley &amp; Sons, Ltd.
Learning-based Face Detection by Adaptive Switching of Skin Color Models and AdaBoost under Varying Illumination (2011)

Face detection has a variety of applications, such as face recognition, face expression analysis, and video conferencing. However, most existing methods for face detection are sensitive to lighting variation. In this paper, a novel scheme invariant with illumination based on adaptive switching of skin color models (ASSM) with lighting compensation for face detection is proposed. The skin-tone pixels detected are connected by the proposed fast 8-connected component labeling method into a more compact skin cluster. An optimal skin color model is thus adaptively selected using a well-dened quality measure. Possible face candidates are further validated by a cascaded AdaBoost detector. Experimental results indicate that robust face detection can be achieved for various lighting conditions, such as dim light, side light, and back light. A detection time of 60 ms for each frame is achieved with the aid of the ASSM method. A detection rate of 94.4% was obtained for a test video sequence.
Chemical dissection and reassembly of a mixed-metal cluster, octadecacarbonylhexacobaltnonamercury (1986)

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemical dissection and reassembly of a mixed-metal cluster, octadecacarbonylhexacobaltnonamercuryJoseph M. Ragosta and James M. BurlitchCite this: Organometallics 1986, 5, 7, 1517–1518Publication Date (Print):July 1, 1986Publication History Published online1 May 2002Published inissue 1 July 1986https://pubs.acs.org/doi/10.1021/om00138a044https://doi.org/10.1021/om00138a044research-articleACS PublicationsRequest reuse permissionsArticle Views26Altmetric-Citations6LEARN 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
Raman Spectroscopy Methods to Characterize the Mechanical Response of Soft Biomaterials (2020)

Raman spectroscopy has been used extensively to characterize the influence of mechanical deformation on microstructure changes in biomaterials. While traditional piezo-spectroscopy has been successful in assessing internal stresses of hard biomaterials by tracking prominent peak shifts, peak shifts due to applied loads are near or below the resolution limit of the spectrometer for soft biomaterials with moduli in the kilo- to mega-Pascal range. In this Review, in addition to peak shifts, other spectral features (e.g., polarized intensity and intensity ratio) that provide quantitative assessments of microstructural orientation and secondary structure in soft biomaterials and their strain dependence are discussed. We provide specific examples for each method and classify sensitive Raman characteristic bands common across natural (e.g., soft tissue) and synthetic (e.g., polymeric scaffolds) soft biomaterials upon mechanical deformation. This Review can provide guidance for researchers aiming to analyze micromechanics of soft tissues and engineered tissue constructs by Raman spectroscopy.
The two-user Gaussian fading broadcast channel (2011)

This paper presents outerbounds for the two-user Gaussian fading broadcast channel. These outerbounds are based on Costa's entropy power inequality (Costa-EPI) and are formulated mathematically as a feasibility problem. For classes of the two-user Gaussian fading broadcast channel where the outerbound is found to have a feasible solution, we find conditions under which a suitable inner and outer bound meet. For all such cases, this paper provides a partial characterization of the capacity region of the Gaussian two-user fading broadcast channel.