gebhart/patrepeval huggingface dataset:
Fractional-Order Variable-Gain Super-Twisting Control With Application to Wafer Stages of Photolithography Systems (2020)

Abstract In this paper, a novel fractional-order variable-gain super-twisting control (FVSTC) scheme is proposed and applied to improve the tracking performance of wafer stages in the photolithography systems. The FVSTC overcomes the drawbacks of the super-twisting control (STC) such as slow response speed and incomplete compensation to disturbances. First, to improve the dynamics of the states on the sliding surface, a fractional-order sliding surface is designed. Moreover, to improve the dynamics of the sliding mode variable, an equivalent-control-based method is utilized, and a switching controller based on a variable-gain super-twisting algorithm is deployed. Via such designed schemes, the proposed controller is robust against external disturbances and model uncertainties. Stability proof of the closed-loop system is provided. Numerical simulations to track a sinusoidal signal and experiments on a wafer stage testbed are conducted. The results show that the proposed FVSTC scheme can achieve much better tracking performance than conventional methods.
Studies on Variability, Heritability and Genetic Advance in Some Quantitative and Qualitative Traits in Bread Wheat (Triticum aestivum L.) under Rainfed Condition (2019)

Present investigation was carried out to study the variability parameters of quantitative as well as qualitative traits and their contribution towards seed yield which may be used as selection criteria for yield improvement in wheat under rainfed condition. Thirty six genotypes of wheat were studied for two consecutive years 2014-2015 and 2015-2016 following Randomized Block Design (RBD) with two replications in this experiment at Kalyani District of West Bengal. A wide range of variability was observed in all characters except chlorophyll- a, chlorophyll-b, total chlorophyll content that indicating sufficient scope for further selection in these traits under rainfed situation. High PCV, GCV, heritability, GA, GA % of mean was observed in the characters viz., Number of grains spike-1, Amylose content, Flag leaf area, Number of florets spike-1 and Test weight under rainfed condition in 36 genotypes of wheat. It implies that, these characters showed predominance of additive gene action. Therefore stabilizing selection should be followed for accumulation of alleles exhibiting additive gene action.
Stereochemical Selection in Phosphoranyl Radical Formation Using Ionizing Radiation (1990)

Abstract Recent electron spin resonance (ESR) experiments on phosphorus-centered radicals generated by ionizing radiation demonstrate that stereochemical aspects act strongly on the rate of radical formation and can be decisive in the selection between the possible resulting radical structures. This phenomenon was first established in a single crystal ESR study on radiogenic electron-capture phosphorus-centered radicals of the racemic and meso stereoisomers of 1.2-dimethyl-1,2-diphenyldiphosphine disulfide (1). The radiation process of the racemic form involves the formation of a symmetric species with a threeelectron bond in an overall low yield. The meso isomer, on the other hand, yields exclusively asymmetric radical configurations in which the unpaired electmn resides on one of the two phosphorus nuclei. The high intensity of the ESR spectra for the meso compound indicate a more efficient electron-capture process. A similar pronounced difference in radiosensitivity was observed for the Rp (1 and Sp (2) isomers of (4S,5R)-2-chloro-3,4-dimethyl-5-phenyl-1,3,2-Oxazaphospholidine 2-sulfide. Upon X irradiation, 1 readily results in an electron-capture phosphorus centered radical, whereas the concurrent process in 2 is almost completely absent. Since the geometric parameters of the atoms directly linked to phosphorus are very much alike for 1 and 2 il can be concluded that the efficiency of electron-capture at phosphorus strongly depends on the relative configuration of the distant chiral centers at C4 and C5.
Interaction of flavonoid topoisomerase I and II inhibitors with DNA oligomers (2006)

The binding affinities of flavonoids, genistein and quercetin, to DNA oligomers have been established by means of studying by NMR the diffusion coefficients of these compounds with and without the presence of DNA. Genistein was found to bind very weakly, Ka = 1.54 × 102 M−1, as compared to quercetin, Ka = 5.75 × 103 M−1 and luteolin, Ka = 2.17 × 104 M−1 (as reported in the literature). In the case of genistein a hydrogen bond between the NHF,B cytidine protons of the edge base pair and a genistein hydroxyl is proposed, based on the shape of the DOSY spectrum. MP2 and DFT calculations of genistein show a 9 kcal mol−1 excess energy of the planar conformation as compared with a twisted one. For this reason intercalation of the planar genistein into the base pairs is rather unlikely.
Computationally Efficient Methods for Incorporation of Spectral Priors in 3-D Optical Tomography (2006)

Use of spectral prior in optical tomography has significantly improved accuracy and quality of images, when applied in two-dimensional (2-D) models. However, the size of the problem increases substantially when applied in 3-D. Two methods are presented here that make 3-D spectral imaging computationally feasible. The data-subset approach uses a smaller subset of variable measurement s to reduce the size of the inverse problem. The basic principle consists of using a dynamic criterion to select optimal subset that capture the major changes in the imaging domain. Additionally, the sensitivity matrix is analyzed and made sparse based on a memory requirements (to 8% of full matrix) and provides less tha 2% percent difference in quantification compared to use of full matrices in the image reconstruction.
Evidence for X(3872) in Pb-Pb Collisions and Studies of its Prompt Production at √ s N N = 5.02     TeV (2021)

The first evidence for X(3872) production in relativistic heavy ion collisions is reported. The $X(3872)$ production is studied in lead-lead (Pb-Pb) collisions at a center-of-mass energy of $\sqrt {s_{NN}}$ 5.02 TeV per nucleon pair, using the decay chain $X(3872) → J/ψ π^+ π^− → μ^+ μ^- π^+ π^−$. The data were recorded with the CMS detector in 2018 and correspond to an integrated luminosity of 1.7 nb$^{-1}$. The measurement is performed in the rapidity and transverse momentum ranges $|y|&lt; $ 1.6 and 15$ &lt; p_T
Comparison of early and delayed scintigraphy with 99mTc-apcitide and correlation with contrast-enhanced venography in detection of acute deep vein thrombosis. (1999)

Although the set of 99mTc-apcitide images obtained 120 min after injection showed good overall diagnostic accuracy, the combination of at least two sets of images provided the highest accuracy in detecting ADVT.
Technological advancements and their importance for nematode identification (2016)

Abstract. Nematodes represent a species-rich and morphologically diverse group of metazoans known to inhabit both aquatic and terrestrial environments. Their role as biological indicators and as key players in nutrient cycling has been well documented. Some plant-parasitic species are also known to cause significant losses to crop production. In spite of this, there still exists a huge gap in our knowledge of their diversity due to the enormity of time and expertise often involved in characterising species using phenotypic features. Molecular methodology provides useful means of complementing the limited number of reliable diagnostic characters available for morphology-based identification. We discuss herein some of the limitations of traditional taxonomy and how molecular methodologies, especially the use of high-throughput sequencing, have assisted in carrying out large-scale nematode community studies and characterisation of phytonematodes through rapid identification of multiple taxa. We also provide brief descriptions of some the current and almost-outdated high-throughput sequencing platforms and their applications in both plant nematology and soil ecology.
Middle-IR frequency comb based on Cr:ZnS laser (2019)

We report, to the best of our knowledge, the first fully referenced Cr:ZnS optical frequency comb. The comb features few cycle output pulses with 3.25 W average power at 80 MHz repetition rate, spectrum spanning 60 THz in the middle-IR range 1.79-2.86 µm, and a small footprint (0.1 m<sup>2</sup>), The spectral components used for the measurement of the comb's carrier envelope offset frequency were obtained directly inside the polycrystalline Cr:ZnS laser medium via intrinsic nonlinear interferometry. Using this scheme we stabilized the offset frequency of the comb with the residual phase noise of 75 mrads.
SOLED-2013-DT2E.4Solution-processed Internal and External Light Extraction Structure for Organic Light-emitting Diode (2013)

Solution-processed out-coupling structures, scattering layer from SiO2 sol with TiO2 particles and corrugation from a mixture of SiO2 and TiOx sol, were optimized for enhanced light extraction of OLED, showing a range of 30-40% improvement.
Progress on crystalline silicon thin film solar cells by FBR-CVD: Effect of substrates and reactor design (2011)

Thin film polycrystalline solar cells on low cost substrates offer an attractive path to large scale production of solar cells with the potential to generate electricity at 1$/W. SRI International has a propriety technology to deposit Si films in a reactor based on fluidized bed technology. The results presented in this paper show that, with a proper reactor design, Si films can be grown at rates of 7 μm/min and higher. Films are crystalline, with crystallite sizes higher than 20 μm. We have also evaluated the performance of SiO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> diffusion barriers as a potential way towards the use of low cost substrates, such as metallurgical grade Si. Whereas SiO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> layers of 0.1 μm are not sufficient to stop P diffusion from the substrate to the film, 0.7 μm layers are thick enough to accomplish this goal. The reactor configuration can be used for continuous and integrated cell/panel fabrication. At present we are building a first continuous reactor, and in this paper we present some preliminary considerations.
Amplitude versus phase effects in extreme ultraviolet lithography mask scattering and imaging (2017)

It is now well established that extreme ultraviolet (EUV) mask multilayer roughness leads to wafer-plane line-width roughness (LWR) in the lithography process. Analysis and modeling done to date has assumed, however, that the roughness leading to scatter is primarily a phase effect and that the amplitude can be ignored. Under this assumption, simple scattering measurements can be used to characterize the statistical properties of the mask roughness. Here, we explore the implications of this simplifying assumption by modeling the imaging impacts of the roughness amplitude component as a function of the balance between amplitude and phase induced scatter. In addition to model-based analysis, we also use an EUV microscope to compare experimental through focus data to modeling in order to assess the actual amount of amplitude roughness on a typical EUV multilayer mask. The results indicate that amplitude roughness accounts for less than 1% of the total scatter for typical EUV masks.
Bowtie nano-aperture as interface between near-fields and a single-mode fiber (2010)

We present the development and study of a single bowtie nano-aperture (BNA) at the end of a monomode optical fiber as an interface between near-fields/nano-optical objects and the fiber mode. To optimize energy conversion between BNA and the single fiber mode, the BNA is opened at the apex of a specially designed polymer fiber tip which acts as an efficient mediator (like a horn optical antenna) between the two systems. As a first application, we propose to use our device as polarizing electric-field nanocollector for scanning near-field optical microscopy (SNOM). However, this BNA-on-fiber probe may also find applications in nanolithography, addressing and telecommunications as well as in situ biological and chemical probing and trapping.
Big Data and Enterprise Analytics. (2013)

In this talk, I will describe the key secular trends that characterize the field of Big Data with respect to enterprise analytics. I will describe some of the open challenges for enterprise analytics in the context of Big Data. Although some of these problems are not new, their importance is amplified by Big Data. As an example, we will discuss the task of leveraging unstructured data for enterprise analytics.
Intracellular growth of Toxoplasma gondii requires association with respiration‐competent mitochondria (2010)

Toxoplasma gondii ( Tg ) is an intracellular parasite that causes the disease toxoplasmosis. Tg grows within a parasitophorous vacuole (PV), a parasite‐modified space surrounded by the parasitophorous vacuolar membrane (PVM), to which host mitochondria and other organelles are recruited. It is our objective to characterize the mechanism and significance of mitochondrial association with the PVM (mito‐PVM association). Initial studies showed that mito‐PVM association is microtubule‐dependent. Using chemical inhibitors, protein over‐expression constructs, and siRNA we have shown that microtubule‐dependent mito‐PVM association requires a functional host dynein/dynactin complex. Tg growth is reduced when mito‐PVM association is inhibited. Tg scavenges lipids from mitochondria, but the significance of host mitochondrial ATP production for Tg is unknown. To address mitochondrial ATP production, a cell line defective in mitochondrial respiration was infected with Tg tachyzoites. Tg growth, development, and egress were significantly inhibited in the respiration‐defective cell line, despite no difference in mito‐PVM association or cellular ATP levels. These results suggest that Tg growth is dependent on association with aerobically respiring mitochondria. Supported by Alabama EPSCoR and NIH Grant A1059267
Dynamic Characteristics of 6.2 kV High Voltage 4H-SiC pn Diode with Low Loss (2003)

A 4H-SiC pin diode with improved termination named mesa JTE has been developed and a high blocking voltage of 6.2kV and a low VF of 4.7V at 100A/cm2 have been achieved. A developed diode has a short reverse recovery time of 28.5ns at room temperature. By evaluation of reverse recovery characteristics, a developed diode has a minority carrier lifetime of longer than 1μs at 350°C in spite of a minority carrier lifetime of 64ns at room temperature. Furthermore, a developed diode has 1/29th lower recovery loss than those of a commercialized 4.5kV Si diode.
Doubly resonant nano-antenna for single infrared quantum dot imaging at telecommunication wavelengths (2018)

International audience
Mask inspection microscopy with 13.2 nm table-top laser illumination (2008)

We report the demonstration of a reflection microscope that operates at 13.2-nm wavelength with a spatial resolution of 55 {+-} 3 nm. The microscope uses illumination from a table-top EUV laser to acquire aerial images of photolithography masks with a 20 second exposure time. The modulation transfer function of the optical system was characterized.
High-performance multi-stage graphene RF receiver integrated circuit (2013)

With the rapid advances in graphene field-effect transistor (GFET) performances, graphene has attracted much interest as a future channel material in RF electronics. However, the pace of the development of graphene circuits seems significantly slower. Several graphene circuits demonstrated today showing promising GHz functions still relied on ideal discrete passive components connected at the equipment level, and these circuits are limited to single transistor designs [1–3]. To compete with existing technologies requires that all active and passive components be monolithically integrated for not only the small circuit footprint and low cost but also high circuit complexity and advanced system functionality.
Microchannel fabrication in silica glass by femtosecond laser pulses with different central wavelengths (2008)

A newly developed tunable visible femtosecond laser source was used to fabricate microchannels in silica glass. For comparison, femtosecond laser pulses from a Ti-sapphire laser at 800 nm as well as from a femtosecond optical parametric amplifier at 1.3 µm were also employed to fabricate microchannels. We found that it is much more efficient to drill micro-channels using the visible pulses because of their lower damage threshold. The quality of the cross section of the microchannel is also better with this visible femtosecond laser source because of the high beam quality of the visible pulses.
Topological Descriptor for Oxygens in Zeolites. Analysis of Ring Counting in Tetracoordinated Nets. (2009)

Topology of zeolite nets has been studied in terms of rings. A freely available software tool for the calculation and systematic analysis of the rings in zeolite nets is presented. Ring indices, associated to T (tetrahedral) and O atoms, are defined as a new topological concept. Ring count is also proposed as a topological descriptor of a structure which gives a fingerprint of the rings (number and size) in a zeotype. These topological concepts are linked with chemical descriptors and used together to systematize and characterize useful information on zeolites such as ring occurrence and TOT angles between different structures. Ring indices of O-sites can be employed to characterize the location of protons in acid zeolites giving a structured information on the ring environment of each active site.
Biosensors Based on Silicon Photonics (2021)

This chapter discusses the biosensors which detect antigen-antibody reactions using silicon photonics. Silicon photonics technology has advantages of low-cost fabrication and high integration of small size optical device because silicon photonics technology uses CMOS compatible technology. The basic concept of a multiple-item detection system including an array of ring-resonator biosensors and a fluid channel with micro-electro-mechanical system microvalves. The electron beam lithography and dry etching are used to obtain accuracy in the order of nanometer. The SiO2 film is used for the silicon etching in order to obtain nearly vertical side walls of the waveguide, because the side wall steepness is much degraded when the resist is used as a mask. In order to efficiently detect an antigen-antibody reaction, it is necessary to fix the antibodies on the sensor surface in the same direction. The resonance wavelength of the sensing ring is initially different from that of the reference ring and they approach by increasing the sucrose concentration.
On uplink OFDMA resource allocation with ergodic sum-rate maximization (2009)

Uplink ergodic sum-rate maximization in OFDMA systems is considered. The general problem is formulated as a convex optimization problem and a dual solution is presented. The problem formulation is generalized to the case of utility maximization where the utility can be any function of rate. A suboptimal scheduling algorithm with low complexity is proposed and shown to achieve close performance to the optimal solution.
[Growth and differentiation of eosinophils--special reference to IL-5 and its receptor]. (1993)

IL-5 is a 46 KDa glycoprotein secreted from activated T cells, and plays an important role both in the growth and production of eosinophils. Murine eosinophils have been reported to express high and low affinity receptors. The IL-5 receptor is composed of two membrane protein subunits, alpha and beta subunits. Both alpha and beta chain of mouse and human IL-5 receptor have been identified and sequenced. The alpha subunit is a 60 KDa protein which binds to IL-5 with low affinity. The beta subunit is a 130 KDa protein which does not bind to IL-5 by itself, but forms the high affinity IL-5 receptor in the presence of the alpha subunit. On the other hand, only a high affinity receptor population has been identified on human eosinophils. Affinity cross-linking experiments resulted in the identification of human IL-5 receptor on eosinophils with a molecular mass of 55-60 KDa.
Plastome Engineering of Ribulose-1,5-Bisphosphate Carboxylase/Oxygenase in Tobacco to Form a Sunflower Large Subunit and Tobacco Small Subunit Hybrid1 (1999)

Targeted gene replacement in plastids was used to explore whether the rbcL gene that codes for the large subunit of ribulose-1, 5-bisphosphate carboxylase/oxygenase, the key enzyme of photosynthetic CO2 fixation, might be replaced with altered forms of the gene. Tobacco (Nicotiana tabacum) plants were transformed with plastid DNA that contained the rbcL gene from either sunflower (Helianthus annuus) or the cyanobacterium Synechococcus PCC6301, along with a selectable marker. Three stable lines of transformants were regenerated that had altered rbcL genes. Those containing the rbcL gene for cyanobacterial ribulose-1,5-bisphosphate carboxylase/oxygenase produced mRNA but no large subunit protein or enzyme activity. Those tobacco plants expressing the sunflower large subunit synthesized a catalytically active hybrid form of the enzyme composed of sunflower large subunits and tobacco small subunits. A third line expressed a chimeric sunflower/tobacco large subunit arising from homologous recombination within the rbcL gene that had properties similar to the hybrid enzyme. This study demonstrated the feasibility of using a binary system in which different forms of the rbcL gene are constructed in a bacterial host and then introduced into a vector for homologous recombination in transformed chloroplasts to produce an active, chimeric enzyme in vivo.
Induced‐Fit Recognition of CCG Trinucleotide Repeats by a Nickel–Chromomycin Complex Resulting in Large‐Scale DNA Deformation (2017)

Small-molecule compounds targeting trinucleotide repeats in DNA have considerable potential as therapeutic or diagnostic agents against many neurological diseases. Ni<sup>II</sup> (Chro)<sub>2</sub> (Chro=chromomycin A3) binds specifically to the minor groove of (CCG)<sub>n</sub> repeats in duplex DNA, with unique fluorescence features that may serve as a probe for disease detection. Crystallographic studies revealed that the specificity originates from the large-scale spatial rearrangement of the DNA structure, including extrusion of consecutive bases and backbone distortions, with a sharp bending of the duplex accompanied by conformational changes in the Ni<sup>II</sup> chelate itself. The DNA deformation of CCG repeats upon binding forms a GGCC tetranucleotide tract, which is recognized by Ni<sup>II</sup> (Chro)<sub>2</sub> . The extruded cytosine and last guanine nucleotides form water-mediated hydrogen bonds, which aid in ligand recognition. The recognition can be accounted for by the classic induced-fit paradigm.
Granular Jamming as Controllable Stiffness Mechanism for Endoscopic and Catheter Applications (2017)

DI-fusion, le Dépôt institutionnel numérique de l'ULB, est l'outil de référencementde la production scientifique de l'ULB.L'interface de recherche DI-fusion permet de consulter les publications des chercheurs de l'ULB et les thèses qui y ont été défendues.