全文获取类型
收费全文 | 124篇 |
免费 | 6篇 |
国内免费 | 1篇 |
专业分类
电工技术 | 2篇 |
化学工业 | 23篇 |
金属工艺 | 1篇 |
机械仪表 | 1篇 |
建筑科学 | 4篇 |
能源动力 | 5篇 |
轻工业 | 17篇 |
水利工程 | 2篇 |
无线电 | 10篇 |
一般工业技术 | 23篇 |
冶金工业 | 17篇 |
原子能技术 | 1篇 |
自动化技术 | 25篇 |
出版年
2023年 | 2篇 |
2022年 | 2篇 |
2021年 | 11篇 |
2020年 | 4篇 |
2019年 | 5篇 |
2018年 | 5篇 |
2017年 | 3篇 |
2016年 | 3篇 |
2015年 | 2篇 |
2014年 | 5篇 |
2013年 | 16篇 |
2012年 | 7篇 |
2011年 | 12篇 |
2010年 | 11篇 |
2009年 | 5篇 |
2008年 | 5篇 |
2007年 | 2篇 |
2006年 | 7篇 |
2005年 | 3篇 |
2004年 | 2篇 |
2002年 | 2篇 |
1999年 | 1篇 |
1998年 | 3篇 |
1997年 | 2篇 |
1996年 | 1篇 |
1995年 | 2篇 |
1994年 | 2篇 |
1985年 | 1篇 |
1983年 | 1篇 |
1980年 | 2篇 |
1977年 | 1篇 |
1961年 | 1篇 |
排序方式: 共有131条查询结果,搜索用时 31 毫秒
101.
Sofien Bouaziz Mario Deuss Yuliy Schwartzburg Thibaut Weise Mark Pauly 《Computer Graphics Forum》2012,31(5):1657-1667
We introduce a unified optimization framework for geometry processing based on shape constraints. These constraints preserve or prescribe the shape of subsets of the points of a geometric data set, such as polygons, one‐ring cells, volume elements, or feature curves. Our method is based on two key concepts: a shape proximity function and shape projection operators. The proximity function encodes the distance of a desired least‐squares fitted elementary target shape to the corresponding vertices of the 3D model. Projection operators are employed to minimize the proximity function by relocating vertices in a minimal way to match the imposed shape constraints. We demonstrate that this approach leads to a simple, robust, and efficient algorithm that allows implementing a variety of geometry processing applications, simply by combining suitable projection operators. We show examples for computing planar and circular meshes, shape space exploration, mesh quality improvement, shape‐preserving deformation, and conformal parametrization. Our optimization framework provides a systematic way of building new solvers for geometry processing and produces similar or better results than state‐of‐the‐art methods. 相似文献
102.
Boukas Ioannis Ernst Damien Théate Thibaut Bolland Adrien Huynen Alexandre Buchwald Martin Wynants Christelle Cornélusse Bertrand 《Machine Learning》2021,110(9):2335-2387
Machine Learning - The large integration of variable energy resources is expected to shift a large part of the energy exchanges closer to real-time, where more accurate forecasts are available. In... 相似文献
103.
Nowadays, more and more companies have to use databases in which they store their essential or confidential data for the society like client lists, product specifications, stock situations, etc.. Such pieces of data are the heart of a company and have to be protected. In fact, in the context of economic intelligence, getting such information is quite interesting for competitors who want to know how rival companies work for example. Databases need software to be managed. There is a variety of software, called database management system, which is able to manage database like MySQL, Oracle Database, Microsoft Access, etc... This paper will focus on Microsoft Access 2010 64 bits which is part of the Microsoft Office 2010 suite. Microsoft Access is currently used by small and medium enterprises (SMEs) who have subcontracted the creation of their database to specialized companies. SMEs represent a huge part of the economic area and could be an interesting target because of the large range of activities it gather. This technical paper analyses the Access Security and explains how an attacker could hijack an Access database in order to steal information or to perform malicious actions on the targeted computer. It deals with macro-viruses, still present after many years, and give then the possibility to use them to insert major security weaknesses into Access databases. 相似文献
104.
We present a novel method for a robot to interactively learn, while executing, a joint human–robot task. We consider collaborative tasks realized by a team of a human operator and a robot helper that adapts to the human’s task execution preferences. Different human operators can have different abilities, experiences, and personal preferences so that a particular allocation of activities in the team is preferred over another. Our main goal is to have the robot learn the task and the preferences of the user to provide a more efficient and acceptable joint task execution. We cast concurrent multi-agent collaboration as a semi-Markov decision process and show how to model the team behavior and learn the expected robot behavior. We further propose an interactive learning framework and we evaluate it both in simulation and on a real robotic setup to show the system can effectively learn and adapt to human expectations. 相似文献
105.
Gbetondji Melaine Armel Nonvide Daniel B. Sarpong George T-M. Kwadzo Henry Anim-Somuah Fulbert Amoussouga Gero 《国际水资源开发杂志》2018,34(6):1001-1021
ABSTRACTThis article examines rice farmers’ perceptions of irrigation and constraints on rice production in the municipality of Malanville, Benin. Farmers’ positive perceptions of irrigation include the use of irrigation for insurance against drought, crop yield improvement, higher income, food security and poverty reduction. Analysis of constraints reveals that farmers face major constraints such as lack of agricultural credit, poor access to production inputs, inadequate knowledge of water resources management, poor access to agricultural information and markets, and flooding of fields. Specific constraints in the irrigation scheme of Malanville include the high cost of irrigation and unavailability of water. 相似文献
106.
We report a pulsed-field gradient NMR study of the size of the oil bodies in lettuce seeds. The pulsed-field gradient spin-echo method (PFGSE) was applied to measure the self-diffusion coefficient of triacylglycerol molecules (TAG) inside the oil bodies. The confined nature of TAG diffusion is used to determine the size dispersion of the oil bodies. At long diffusion time, we measure a spin-echo attenuation that is related to the form factor of the confining volumes in the reciprocal q space, where q is proportional to the product of the gradient intensity and the length of the pulse gradient. Specific care was taken in analyzing the influence of the gradient pulse length delta on the shape of the PFGSE decay in order to construct the function corresponding to the short gradient pulse approximation (SGP). The SGP model gives an analytical framework for the PFGSE signal that enables the size distribution of the oil bodies to be determined. The SGP function was unambiguously obtained by varying the gradient pulse length delta in order to linearly extrapolate at delta = 0 the SGP limit. In this work, we also consider the Gaussian phase distribution (GPD) assumption that is often used to analyze confined diffusion experiments. Although the GPD assumption is known to be inaccurate in predicting the fine structure of the PFGSE function in q space, we point out that in the present case it can be used to take into account the finite value of delta. A log-normal distribution of the radius values was assumed in simulating the PFGNMR experiments since this type of distribution is observed in vegetable seeds by transmission electronic microscopy. From a practical and experimental standpoint, the NMR measurements reported here require no specific treatment of the seeds and the size of oil bodies is determined "in situ" on seeds poured into the NMR tube. 相似文献
107.
Thibaut Crochon Tony Schönherr Chun Li Martin Lévesque 《Mechanics of Time-Dependent Materials》2010,14(4):359-387
This paper presents two new strategies for implementing Schapery-type nonlinearly viscoelastic constitutive theories into
finite element codes. The first strategy uses the original differential equations that lead to the integral formulation of
Schapery-type constitutive theories and Finite Difference (FD) schemes. This strategy is quite different from all the other
strategies found in the literature. The second strategy is an improvement of recursive strategies, used by many authors, based
on the integral formulation of the constitutive theory. The performances of the new algorithms are compared with those of
existing strategies for various load histories and nonlinearities. It is shown that the newly developed strategy based on
FD schemes can exhibit quadratic convergence rate when one time step is stored and 4th order convergence rate when two time
steps are stored, which is a major improvement over the recursive strategies. 相似文献
108.
Luca X. Zampieri Martina Sboarina Andrea Cacace Debora Grasso Lopold Thabault Loïc Hamelin Thibaut Vazeille Elodie Dumon Rodrigue Rossignol Raphaël Frdrick Etienne Sonveaux Florence Lefranc Pierre Sonveaux 《International journal of molecular sciences》2021,22(21)
Glioblastoma represents the highest grade of brain tumors. Despite maximal resection surgery associated with radiotherapy and concomitant followed by adjuvant chemotherapy with temozolomide (TMZ), patients have a very poor prognosis due to the rapid recurrence and the acquisition of resistance to TMZ. Here, initially considering that TMZ is a prodrug whose activation is pH-dependent, we explored the contribution of glioblastoma cell metabolism to TMZ resistance. Using isogenic TMZ-sensitive and TMZ-resistant human glioblastoma cells, we report that the expression of O6-methylguanine DNA methyltransferase (MGMT), which is known to repair TMZ-induced DNA methylation, does not primarily account for TMZ resistance. Rather, fitter mitochondria in TMZ-resistant glioblastoma cells are a direct cause of chemoresistance that can be targeted by inhibiting oxidative phosphorylation and/or autophagy/mitophagy. Unexpectedly, we found that PARP inhibitor olaparib, but not talazoparib, is also a mitochondrial Complex I inhibitor. Hence, we propose that the anticancer activities of olaparib in glioblastoma and other cancer types combine DNA repair inhibition and impairment of cancer cell respiration. 相似文献
109.
Marine Lebel Thibaut Very Eric Gloaguen Benjamin Tardivel Michel Mons Valrie Brenner 《International journal of molecular sciences》2022,23(2)
The present benchmark calculations testify to the validity of time-dependent density functional theory (TD-DFT) when exploring the low-lying excited states potential energy surfaces of models of phenylalanine protein chains. Among three functionals suitable for systems exhibiting charge-transfer excited states, LC-ωPBE, CAM-B3LYP, and ωB97X-D, which were tested on a reference peptide system, we selected the ωB97X-D functional, which gave the best results compared to the approximate coupled-cluster singles and doubles (CC2) method. A quantitative agreement for both the geometrical parameters and the vibrational frequencies was obtained for the lowest singlet excited state (a ππ* state) of the series of capped peptides. In contrast, only a qualitative agreement was met for the corresponding adiabatic zero-point vibrational energy (ZPVE)-corrected excitation energies. Two composite protocols combining CC2 and DFT/TD-DFT methods were then developed to improve these calculations. Both protocols substantially reduced the error compared to CC2 and experiment, and the best of both even led to results of CC2 quality at a lower cost, thus providing a reliable alternative to this method for very large systems. 相似文献
110.
Small Molecule‐Based Fluorescent Organic Nanoassemblies with Strong Hydrogen Bonding Networks for Fine Tuning and Monitoring Drug Delivery in Cancer Cells 下载免费PDF全文
Joanna Boucard Camille Linot Thibaut Blondy Steven Nedellec Philippe Hulin Christophe Blanquart Lénaïc Lartigue Eléna Ishow 《Small (Weinheim an der Bergstrasse, Germany)》2018,14(38)
Bright supramolecular fluorescent organic nanoassemblies (FONs), based on strongly polar red‐emissive benzothiadiazole fluorophores containing acidic units, are fabricated to serve as theranostic tools with large colloidal stability in the absence of a polymer or surfactant. High architectural cohesion is ensured by the multiple hydrogen‐bonding networks, reinforced by the dipolar and hydrophobic interactions developed between the dyes. Such interactions are harnessed to ensure high payload encapsulation and efficient trapping of hydrophobic and hydrogen‐bonding drugs like doxorubicin, as shown by steady state and time‐resolved measurements. Fine tuning of the drug release in cancer cells is achieved by adjusting the structure and combination of the fluorophore acidic units. Notably delayed drug delivery is observed by confocal microscopy compared to the entrance of hydrosoluble doxorubicin, demonstrating the absence of undesirable burst release outside the cells by using FONs. Since FON‐constituting fluorophores exhibit a large emission shift from red to green when dissociating in contact with the lipid cellular content, drug delivery could advantageously be followed by dual‐color spectral detection, independently of the drug staining potentiality. 相似文献