检索结果-南通市图书馆

Fully digital intensity modulated LIDAR

在线全文

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2016年第4期12卷 290-296页

作者： Fabio POLLASTRONE Gian Carlo CARDARILLI Roberto PIZZOFERRATO Marco re Department FSN FUSTEC–IEE-ENEA Frascati Department of Electronics Engineering University of Rome "Tor Vergata" Department of Industrial Engineering University of Rome "Tor Vergata"

In several applications, such as collision avoidance, it is necessary to have a system able to rapidly detect the simultaneous presence of different obstacles. In general, these applications do not require high resolution performance, but it is necessary to assure high system reliability also within critical scenarios, as in the case of partially transparent atmosphere or environment in presence of multiple objects(implying multiple echoes having different delay times.) This paper describes the algorithm, the architecture and the implementation of a digital Light Detection and Ranging(LIDAR) system based on a chirped optical carrier. This technique provides some advantages compared to the pulsed approach, primarily the reduction of the peak power of the laser. In the proposed architecture all the algorithms for signal processing are implemented using digital hardware. In this way, some specific advantages are obtained: improved detection performance(larger dynamics, range and resolution), capability of detecting multiple obstacles having different echoes amplitude, reduction of the noise effects, reduction of the costs, size and weight of the resulting equipment. The improvement provided by this fully digital solution is potentially useful in different applications such as: collision avoidance systems, 3D mapping of environments and, in general, remote sensing systems which need wide distance and dynamics.

关键词： CW-IM LIDAR Chirp Laser Obstacle Avoidance

Earthquake distribution and lithospheric rheology beneath the Northwestern Andes, Colombia

在线全文

学校读者我要写书评

暂无评论

Geodesy and Geodynamics 2021年第1期12卷 1-10页

作者： Carla Lagardère Carlos A.Vargas Department of Geosciences Universidad Nacional de ColombiaBogotaColombia Ecole nationale superieure en environnement georessources et ingenierie du developpement durable(ENSEGID)BordeauxFrance

The rheological behavior of the lithosphere beneath the Northwestern(NW)Andes(Colombian)remains uncertain under a complex geological ***,we analyze the earthquake distribution and the stress drop on the western and the eastern of the transition area between the Upper Magdalena Valley(UMV)and the Middle Magdalena Valley(MMV),a zone related to a plate tectonic transition from steeper to flatter subduction style slabs(Nazca and Caribbean plates).Our results consistently explain the tectonic and geodynamic context of the study area supported in two rheological profiles,which reveal the brittle/ductile transition of the lithospheric crust and mantle and allow to constrain the lithospheric rheological *** subduction phenomenon of the Nazca Plate under the South American Plate is observed in the western *** the eastern region,we find a remarkable aseismic zone under the Eastern Cordillera below 20-km-deep,which made more difficultan accurate estimation of the crust/mantle *** seismic particularity leads us to support the hypothesis of a delamination process due to the tectonic overload generated by the Eastern Cordillera,and that promotes thermal *** results also suggest that the earthquake dataset correlated with rheological estimations may offer a consistent interpretation of the mechanical behavior of the lithosphere.

关键词： Lithosphere rheology Seismicity Northwestern Andes Delamination process

在线全文

学校读者我要写书评

暂无评论

城市公共空间水体对使用者情感影响的研究

城市公共空间水体对使用者情感影响的研究

作者： Anna St(?)pie(?) 湖南农业大学

学位级别：硕士

多年来,环境心理学研究人类的和自然的环境之间的纽带。人们的审美吸引力,绿化环境是由研究数字注重人与自然不容置疑隶属关系的主题证实。在自然景观编码的喜好论文提出,最流行的一个是草原假说。除了的研究证实大自然的联系,研究侧重... 详细信息

多年来,环境心理学研究人类的和自然的环境之间的纽带。人们的审美吸引力,绿化环境是由研究数字注重人与自然不容置疑隶属关系的主题证实。在自然景观编码的喜好论文提出,最流行的一个是草原假说。除了的研究证实大自然的联系,研究侧重于大自然的积极影响增长的数量。大自然的恢复性能和它的元素成为环境心理学讨论的主要话题之一。研究数字证实自然环境对人类的积极影响。另一个有趣的发现可以通过禁用Komar和Melamid创造了最好的绘画后才会发现。景观和蓝色环境上的画其他元素的比例的基本形式是在几乎所有的作品非常相似。每一个之间的差在同化细节的表格。的蓝色环境压倒性量建议水元素在所需景观的重要性。水是对空间的感知人的影响力显著一个强大的元素。在许多文化和宗教人们可以找到这个元素,如类似的意思：生命,重生,重建和能源。这象征使水的通用设计功能,可以对任何人说,对于国籍或信仰。这一发现表明,人们与水之间的持久连接。

关键词： -水稀树草原假说 biophilia 环境心理学情绪影响

Exosomes from adipose tissue-derived stem/stromal cells:A key to future regenerative medicine

同方学位论文库评论

在线全文

同方学位论文库

学校读者我要写书评

暂无评论

BIOCELL 2022年第12期46卷 2701-2704页

作者： JÉRÔME LALOZE ALEXIS DESMOULIÈre University of Limoges Neuropathies and Therapeutic Innovations(UR 20218)Faculties of Medicine and PharmacyLimogesF-87000France Department of Maxillo-Facial and reconstructive Surgery and Stomatology University Hospital DupuytrenLimogesF-87000France

Advances in regenerative medicine correlate strongly with progress in the use of adipose tissue-derived mesenchymal stem/stromal *** range of therapeutic indications has also expanded over recent *** recent studies have highlighted the primary importance of paracrine secretion by these *** it is interesting to compare the different types of such secretions,we believe that exosomes(extra-cellular vesicles possessing the same properties as their source cells)will likely be the main key in tomorrow’s cell *** also have many advantages compared to the direct use of cells,making these particles amajor target in fundamental and translational research.

关键词： Adipose-derived mesenchymal stem/stromal cell Exosome regenerative medicine Secretome

Corrosion rate determination of rare-earth Mg alloys in a Na_(2)SO_(4)solution by electrochemical measurements and inductive coupled plasma-optical emission spectroscopy

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Magnesium and Alloys 2019年第1期7卷 47-57页

作者： Samuel Leleu Bertrand Rives Nicolas Causse Nadine Pébère CIRIMAT Universitéde ToulouseCNRSINPTUPSENSIACET4 allée Emile Monso BP4436231030 Toulouse cedex 4 France IRT Saint Exupéry 118 route de Narbonne-CS 4424831432 ToulouseFrance

The corrosion resistance of three Mg alloys containing rare-earth elements(WE43,EV31 and ZE41)was studied and compared to that of two Mg-Al alloys(AZ31 and AZ91)and of pure Mg(99.95 wt.%).Current-voltage curves and electrochemical impedance measurements were performed with rotating disk electrodes in an aerated 0.1 M Na_(2)SO_(4)*** all the alloys,it was confirmed that the intermetallic particles acted as local cathodes and that more protective films were formed on the alloys surface by comparison with the pure *** rates were determined from inductive coupled plasma-optical emission spectroscopy measurements and from the electrochemical *** corrosion rates were observed for the rare-earth Mg alloys compared to the AZ series *** data allowed the corrosion mechanisms to be discussed.

关键词： Magnesium alloys Rare-earth elements EIS ICP-OES Interface

Mechanical properties of nanocrystalline nanoporous gold complicated by variation of grain and ligament: A molecular dynamics simulation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2018年第9期61卷 1353-1363页

作者： LI JieJie XIAN YueHui ZHOU HongJian WU RunNi HU GuoMing XIA re Key Laboratory of Hydraulic Machinery Transients Ministry of Education Wuhan University Hubei Key Laboratory of Waterjet Theory and New Technology Wuhan University

A series of large-scale molecular dynamics(MD) simulations has been performed to study the effects of grain size and ligament diameter on the mechanical properties of nanocrystalline nanoporous gold. Such simulations indicate that the principal deformation mechanism is a combination of grain boundary sliding, grain rotation and dislocation movement. The results of uniaxial tensile tests reveal the presence of a reverse Hall-Petch relation between strength and nominal grain size, rather than the conventional Hall-Petch relationship in the present range of nominal grain size(7.9–52.7 nm). An increase of flow stress may possibly attribute to the lower total proportion of grain boundary sliding and grain rotation in the deformation of samples with larger grain size. The Young's modulus shows a linear relation with the reciprocal of nominal grain size, which depends largely on the volume fraction of grain boundaries and thus decreasing grain size leads to relatively lower Young's modulus. MD simulations on samples with ligament diameter ranging from 4.07 to 8.10 nm are also carried out and results show that the increasing ligament diameter resulted in decreased flow stress and increased Young's modulus.

关键词： nanocrystalline nanoporous gold grain-size effect ligament-size effect mechanical properties molecular dynamics

m^(6)A Profile Dynamics Indicates regulation of Oyster Development by m^(6)A-RNA Epitranscriptomes

在线全文

学校读者我要写书评

暂无评论

Genomics, Proteomics & Bioinformatics 2023年第4期21卷 742-755页

作者： Lorane Le Franc Bruno Petton Pascal Favrel Guillaume Rivière Laboratoire de Biologie des Organismes et des Ecosyste`mes Aquatiques(BOreA) Muséum d’Histoire NaturelleSorbonne UniversitéUniversitéde Caen NormandieUniversitédes AntillesCNRS UMR 8067IRD14032 CaenFrance Ifremer Laboratoire des Sciences de l’Environnement MarinUMR 6539 CNRS/UBO/IRD/IfremerCentre Bretagne29280 PlouzanéFrance

The N6-methylation of RNA adenosines(N6-methyladenosine,m^(6)A)is an important regulator of gene expression with critical implications in vertebrate and insect ***,the developmental significance of epitranscriptomes in lophotrochozoan organisms remains *** methylated RNA immunoprecipitation sequencing(MeRIP-seq),we generated transcriptome-wide m^(6)A-RNA methylomes covering the entire development of the oyster from oocytes to *** RNA classes display specific m^(6)A signatures,with messenger RNAs(mRNAs)and long non-coding RNAs(lncRNAs)exhibiting distinct profiles and being highly methylated compared to transposable element(TE)*** are dynamic and correspond to the chronological steps of development(cleavage,gastrulation,organogenesis,and metamorphosis),with minimal mRNA and lncRNA methylation at the morula stage followed by a global *** m^(6)A levels are correlated with transcript levels,and shifts in methylation profiles correspond to expression *** methylated transcripts cluster according to embryo-larval stages and bear the corresponding developmental functions(cell division,signal transduction,morphogenesis,and cell differentiation).The m^(6)A level of TE transcripts is also regulated and peaks during the *** demonstrate that m^(6)A-RNA methylomes are dynamic and associated with gene expression regulation during oyster *** putative epitranscriptome implication in the cleavage,maternal-to-zygotic transition,and cell differentiation in a lophotrochozoan model brings new insights into the control and evolution of developmental processes.

关键词： RNA methylation Transcription Embryo Metamorphosis Evo-devo

Physical exercise in locally advanced pancreatic adenocarcinoma: "If I walk, I live. Although one can die of cancer, now I am living"

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Cancer Metastasis and Treatment 2019年第12期4卷 41-48页

作者： Giovanni Lo re Silvia Magnaldi Paolo Doretto Roberto Innocente Francesco Lo re Medical Oncology and Immune-related tumors CRO IRCCSAviano 33081Italy Radiology AAS5 PordenonesePordenone 33170Italy Clinical pathology AAS5 PordenonesePordenone 33170Italy Radiotherapy Centro di Riferimento Oncologico(CRO)Aviano 33081Italy Chemotherapy and Medical Toxicology Study UniversityMilan 20129Italy

The most widely used chemotherapeutic combinations in locally advanced (LA) or metastatic pancreatic ductal adenocarcinoma(PDAC)areNab-Paclitaxel-Gemcitabine(Nab-PCT-GEM)andFluorouracil,Folinicacid,Oxaliplatin, and irinotecan (FOLFIRINOX). Chemo-resistance, typical of PDAC, appears to be due to the negative influence of stroma population cells, namely regulatory T cells (Treg) and myeloid-derived suppressor cells, macrophages with inhibitory effects on the antitumor activity of the innate and adaptive immune systems, and resistance to cancer treatment. Among other factors that may influence immune surveillance, constant physical activity appears to reduce the risk of cancer-related mortality and cardiovascular risk. However, this does not seem to increase the survival of patients with PDAC. The exception is our young inoperable patient. For LA head PDAC, he was treated with seven cycles of Nab-PCT-GEM and RT 50 Gy/15 fractions combined to biweekly GEM and salvage FOLFIRINOX. The five-year surviving patient travelled 15,000 km on foot and continues inexorably his "walking therapy".

关键词： Pancreatic adenocarcinoma depression physical activity Nab-paclitaxel fluorouracil regulatory T cells myeloid-derived suppressor cells

Stiction of a Nano-Beam with Surface Effect

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 Physics Letters 2011年第11期28卷 186-189页

作者： LIU Jian-Lin XIA re ZHOU Yue-Ting Department of Engineering Mechanics China University of PetroleumQingdao 266555 Key Laboratory of Transients in Hydraulic Machinery Ministry of EducationWuhan 430072 School of Mechanical Engineering Yonsei UniversitySeoul 120-749Republic of Korea

Nanowire stiction is a crucial bottleneck for the development of M/NEMS *** present a model of a nano-beam stuck to the substrate in consideration of both surface elasticity and residual surface *** critical detachment length can be derived from the transversality condition using the variational *** effects of the surface parameters on the adhesion of the nano-beam are discussed in *** analyses provide some suggestions for engineers in the design and fabrication of more accurate M/NEMS instruments.

关键词： elasticity beam surface