检索结果-南通市图书馆

Light(Science & Applications) 2022年第12期11卷 3028-3043页

作者： Zhaoqing Li olivier Allegre Lin Li Department of Mechanical Aerospace and Civil EngineeringThe University of ManchesterManchester M139PLUK

In semiconductor and data storage device manufacturing,it is desirable to produce feature sizes less than 30 nm with a high depth-to-width aspect ratio on the target material rapidly at a low ***,optical diffraction limits the smallest focused laser beam diameter to around half of the laser wavelength(λ/2).The existing approach to achieving nanoscale fabrication is mainly based on costly extreme ultraviolet(EUV)technology operating within the diffraction *** this paper,a new method is shown to achieve materials processing resolution down to 10 nm(λ/80)at an infrared laser wavelength of around 800 nm in the far-field,in air,well beyond the optical diffraction limit.A highquality longitudinal field with a purity of 94.7% is generated to realise this *** experiments and theoretical modelling have been carried out to verify and understand the *** ablation craters induced on polished silicon,copper,and sapphire are compared for different types of light *** of 10-30 nm in diameter are produced on sapphire with a depth-to-width aspect ratio of over 16 and a zero taper with a single pulse at 100-120 nJ pulse *** high aspect ratio sub-50 nm holes produced with single pulse laser irradiation are rarely seen in laser processing,indicating a new material removal mechanism with the longitudinal *** working distance(lens to target)is around 170μm,thus the material processing is in the far *** nano-holes can also be produced by adjusting the lens to the target distance.

关键词： sapphire field purity

RENORMALIZED SOLUTIONS OF ELLIPTIC EQUATIONS WITH ROBIN BOUNDARY CONDITIONS

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Mathematica Scientia 2017年第4期37卷 889-910页

作者： olivier GUIBE Alip OROPEZA Laboratoire de Mathématiques Raphaёl Salem CNRSUMR 6085Universitéde RouenAvenue de l'UniversiteBP 1276801 Saint-Etienne du Rouvray cedexFrance University of the Philippines Diliman Institute of Mathematics1101 DilimanQuezon CityPhilippines

In the present paper, we consider elliptic equations with nonlinear and nonlao mogeneous Robin boundary conditions of the type {-div（B（x,u）△u） = f in Ω,u=0 on Гo, B（x,u）Vu·n^-＋γ（x）h（u） = 9 on Г1,where f and g are the element of L^1（Ω） and L^1（Г1）, respectively. We define a notion of renormalized solution and we prove the existence of a solution. Under additionM assumptions on the matrix field B we show that the renormalized solution is unique.

关键词： elliptic equations renormalized solution uniqueness Robin boundary conditions L^1 data

Decay of Solutions to a Linear Viscous Asymptotic Model for Water Waves

在线全文

学校读者我要写书评

暂无评论

Chinese Annals of Mathematics,Series B 2010年第6期31卷 841-854页

作者： olivier GOUBET Guillaume WARNAULT LAMFA UMR 6140 CNRS UPJV 33 rue Saint-Leu Amiens 80039 cedex France LMPT UMR CNRS 6083 Université Francois Rabelais Parc Grandmont 37000 Tours France

The authors discuss a linear viscous asymptotic model for water waves and the decay rate of solutions towards the equilibrium.

关键词： Water waves Viscous asymptotic models Nonlocal operators Long-time asymptotics

Challenges Associated with Creeping Disasters in Disaster Risk Science and Practice:Considering Disaster Onset Dynamics

在线全文

学校读者我要写书评

暂无评论

International Journal of Disaster Risk Science 2022年第1期13卷 1-11页

作者： Reidar Staupe-Delgado olivier Rubin Department of Social Sciences and Business.Roskilde University 4000 RoskildeDenmark Department of Technology and Safety UiT The Arctic University of Norway9037 TromsONorway

In this article,we set out to reconcile a general conceptualization of disaster temporalities by drawing on the epitome example of a creeping disaster,namely *** argument is driven by the recognition that slowly manifesting disaster impacts pose distinct challenges for decision makers and researchers while there is a tendency for the disaster literature to overlook the role of disaster onset *** specifically and as a starting point,we identify four key themes that merit particular attention when dealing with creeping disasters:(1)our understanding of disaster as a phenomenon;(2)measurement and operationalization;(3)early warning and response;and(4)disaster management and *** integrating conceptual discussions of disaster with famine scholarship—a phenomenon often excluded from mainstream disaster research—this article provides fresh perspectives on disaster science as well as a number of implications for how we think about disaster risk reduction.

关键词： Disaster response Early warning Famine disasters Slow-onset disasters

Dynamic Simulations of Post-stall Performance in Multistage Axial Compressors

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2012年第4期21卷 311-321页

作者： DU Wenhai ZHU JunQiang olivier Leonard University of Liege Turbomachinery Group B-4000 Liege Belgium Institute of Engineering Thermophysics ChineseAcademy of Sciences China Chinese Academy of Sciences China University of Liege Turbomachinery Group Chemin des chevreuils 1 B-4000 Liege Belgium

In this contribution a quasi-one-dimensional tool for stationary and transient simulations of post-stall flows in multistage axial compressors is presented. An adapted version of the 1D Euler equations with additional source terms is discretized with a finite volume method and solved in time by a fourth-order Runge-Kutta scheme. The equations are discretized at midspan both inside the blade rows and the non-bladed regions. The source terms express the blade-flow interactions and are estimated by calculating the velocity triangles for each blade row. Loss and deviation correlations are implemented and compared to experimental data in normal flow, stalled flow and reversed flow regions. Transient simulations are carried out and a parameter study is presented to analyze the shape of the surge cycles and the frequency of the surge oscillations. At last, a bleeding control strategy is implemented to study the recoverability of the instabilities in a compression system.

关键词： surge axial compressor dynamic simulation quasi-one-dimensional model bleeding control

Benchmarks of 3D Laplace Equation Solvers in a Cubic Configuration for Streamer Simulation

在线全文

学校读者我要写书评

暂无评论

Plasma Science and Technology 2016年第5期18卷 538-543页

作者： Joseph-Marie PLEWA olivier DUCASSE Philippe DESSANTE Carolyn JACOBS olivier EICHWALD Nicolas RENON Mohammed YOUSFI Universite de Toulouse UPS INPT LAPLACE (Laboratoire Plasma et Conversion d'Energie) Toulouse Cedex 9 F-31062 France Group of Electrical Engineering-Paris (GeePs) UMR 8507 CNRS CentraleSupelec Universite Paris-Sud-UPMC 11 rue Joliot-Curie Plateau de Moulon 91192 Gif-sur-Yvette Cedex F-91192 France CALMIP Universite de Toulouse-CNRS-INPT-INSA-UPS UMS 3667 France CNRS LAPLACE Toulouse F-31062 France

The aim of this paper is to test a developed SOR R＆B method using the Chebyshev accelerator algorithm to solve the Laplace equation in a cubic 3D configuration. Comparisons are made in terms of precision and computing time with other elliptic equation solvers proposed in the open source LIS library. The first results, obtained by using a single core on a HPC, show that the developed SOR R＆B method is efficient when the spectral radius needed for the Chebyshev acceleration is carefully pre-estimated. Preliminary results obtained with a parallelized code using the MPI library are also discussed when the calculation is distributed over one hundred cores.

关键词： numerical methods for elliptic equations high performance computing 3Dstreamer simulation SOR IDR BiCGSTAB

Laparoscopic liver resection for living donation: Where do we stand?

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2014年第42期20卷 15590-15598页

作者： Fran?ois Cauchy Lilian Schwarz olivier Scatton olivier Soubrane Service de Chirurgie Hépato-Bilio-Pancréatique et Transplantation Hépatique H?pital Saint-Antoine Assistance Publique - H?pitaux de Paris Department of HPB Surgery and Liver Transplantation Hopital Beaujon

In Western countries, living donor liver transplantation (LDLT) may represent a valuable alternative to deceased donor liver transplantation. Yet, after an initial peak of enthusiasm, reports of high rates of complications and of fatalities have led to a certain degree of reluctance towards this procedure especially in Western countries. As for living donor kidney transplantation, the laparoscopic approach could improve patient’s tolerance in order to rehabilitate this strategy and reverse the current trend. In this setting however, initial concerns regarding patient’s safety and graft integrity, need for acquiring surgical expertise in both laparoscopic liver surgery and living donor transplantation and lack of evidence supporting the benefits of laparoscopy have delayed the development of this approach. Similarly to what is performed in classical resectional liver surgery, initial experiences of laparoscopy have therefore begun with left lateral sectionectomy, which is performed for adult to child living donation. In this setting, the laparoscopic technique is now well standardized, is associated with decreased donor blood loss and hospital stays and provides graft of similar quality compared to the open approach. On the other hand laparoscopic major right or left hepatectomies for adult-adult LDLT currently lack standardization and various techniques such as the full laparoscopic approach, the hand assisted approach and the hybrid approach have been reported. Hence, even-though several reports highlight the feasibility of these procedures, the true benefits of laparoscopy over laparotomy remain to be fully assessed. This could be achieved through standardization of the procedures and creation of international registries especially in Eastern countries where LDLT keeps on flourishing.

关键词： Liver transplantation Laparoscopy Living donation Postoperative course

Genome Organization and Function： A View from Yeast and Arabidopsis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Molecular Plant 2010年第4期3卷 678-690页

作者： Julio Saez-Vasquez olivier Gadal LGDP-UMR 5096 CNRS-IRD-Universite de Perpignan via Dornitia 58 Av. Paul Alduy 66860 Perpignan France Laboratoire de Biologie Moleculaire Eucaryote Universite de Toulouse Toulouse France LBME CNRS Toulouse France

Recent progress in understanding higher-order chromatin organization in the nucleus has been considerable. From single gene to chromosome territory, realistic biophysical models can now accurately predict some of the structural feature of cell nuclei. Despite growing evidence of a deterministic nuclear organization, the physiological consequence of spatial genome organization is still unclear. In the simple eukaryotic model, Saccharomyces cerevisiae, clear correlation between gene position and transcription has been established. In this review, we will focus on higher-order chromatin organization in yeast with respect to the nuclear envelope and nucleolus. In Arabidopsis thaliana, a model plant for which we have a complete genome sequence, chromosome territory （CT） arrangement and somatic homologous pairing in interphase nuclei seem to occur randomly. Since chromosomes containing nucleolar organizer regions associate more frequently to form a single nucleolar structure, as in yeast, the nucleolus seems to play a major role in organizing nuclear space. Recent findings have begun to elucidate how plant regulatory factors, such as chromatin remodeling or histone chaperones, affect the chromatin state of ribosomal DNA genes located in two distinct CTarrangements in the nucleus. The functional outcome of yeast nuclear organization allowed us to propose how nuclear organization might contribute to a novel type of epigenetic regulation： the spatial regulation of transcription.

关键词： Nuclear structure chromatin organization nuclear body nucleolus.

High-grade gliomas: reality and hopes

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Cancer 2014年第1期33卷 1-3页

作者： René-olivier Mirimanoff Department of Radiation Oncology Clinique de La SourceLausanne CH-1004 Switzerland Faculty of Biology and Medicine University of LausanneClinique de La SourceLausanne CH-1004 Switzerland

In this issue of the Chinese Journal of Cancer, European experts review current standards, trends, and future prospects in the difficult domain of high-grade glioma. In all fields covered by the different authors, the progress has been impressive. For example, discoveries at the molecular level have already impacted imaging, surgery, radiotherapy, and systemic therapies, and they are expected to play an increasing role in the management of these cancers. The European Organization for Research and Treatment of Cancer(EORTC) has pioneered new treatment strategies and contributed to new standards. The articles in this issue will cover basic molecular biological principles applicable today, novel surgical approaches, innovations in radiotherapy planning and delivery, evidence-based standards for radiotherapy alone or combined with chemotherapy, current standards and novel approaches for systemic treatments, and the important but often neglected field of health-related quality of life. Despite the advances described in these articles, the overall prognosis of high-grade glioma, especially glioblastoma, remains poor, and more research is needed to address this problem.

关键词：胶质瘤全身治疗分子水平手术方法生物学原理发展趋势放射治疗标准

Complete hepatocellular carcinoma necrosis following sequential porto-arterial embolization

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2008年第44期14卷 6869-6872页

作者： Stéphane Zalinski olivier Scatton Bruto Randone olivier Vignaux Bertrand Dousset Department of Surgery Cochin HospitalAssistance Publique-Hpitaux de ParisUniversité DescartesParisFrance Department of Radiology Cochin HospitalAssistance Publique-Hpitaux de ParisUniversité DescartesParisFrance

Most patients with hepatocellular carcinoma （HCC） are not eligible for curative treatment, which is resection or transplantation. Two recent series have emphasized the potential benefits of preoperative arterio-portal embolization prior to surgical resection of such tumours. This preoperative strategy offers a better disease free survival rate and a higher rate of total tumor necrosis. In case of non resectable HCC it is now widely accepted that transarterial chemoembolization （TACE） leads to a better survival when compared to conservative treatment. Thus, the question remains whether combined portal vein embolization （PVE） may enhance the proven efficiency of TACE in patients with unresectable HCC. We herein report the case of a 56-year-old cirrhotic woman with a voluminous HCC unsuitable for surgical resection. Yet, complete turnout necrosis and prolonged survival could be achieved a^er a combined porto-arterial embolization. This case emphasizes the potential synergistic effect of a combined arterio-portal embolization and the hypothetical survival benefit of such a procedure, in selected patients, with HCC not suitable for surgery or local ablative therapy.

关键词： Hepatocellular carcinoma Sequentialarterio-portal embolization Palliative treatment