全文获取类型
收费全文 | 1492篇 |
免费 | 76篇 |
专业分类
电工技术 | 23篇 |
综合类 | 2篇 |
化学工业 | 390篇 |
金属工艺 | 49篇 |
机械仪表 | 23篇 |
建筑科学 | 78篇 |
矿业工程 | 3篇 |
能源动力 | 52篇 |
轻工业 | 93篇 |
水利工程 | 11篇 |
石油天然气 | 2篇 |
无线电 | 89篇 |
一般工业技术 | 265篇 |
冶金工业 | 136篇 |
原子能技术 | 8篇 |
自动化技术 | 344篇 |
出版年
2023年 | 19篇 |
2022年 | 43篇 |
2021年 | 66篇 |
2020年 | 38篇 |
2019年 | 34篇 |
2018年 | 42篇 |
2017年 | 43篇 |
2016年 | 56篇 |
2015年 | 62篇 |
2014年 | 60篇 |
2013年 | 100篇 |
2012年 | 85篇 |
2011年 | 122篇 |
2010年 | 77篇 |
2009年 | 73篇 |
2008年 | 96篇 |
2007年 | 72篇 |
2006年 | 69篇 |
2005年 | 45篇 |
2004年 | 34篇 |
2003年 | 25篇 |
2002年 | 24篇 |
2001年 | 22篇 |
2000年 | 15篇 |
1999年 | 33篇 |
1998年 | 36篇 |
1997年 | 24篇 |
1996年 | 10篇 |
1995年 | 13篇 |
1994年 | 16篇 |
1993年 | 11篇 |
1990年 | 7篇 |
1989年 | 6篇 |
1988年 | 8篇 |
1987年 | 5篇 |
1986年 | 5篇 |
1985年 | 10篇 |
1984年 | 3篇 |
1983年 | 5篇 |
1982年 | 7篇 |
1981年 | 5篇 |
1979年 | 3篇 |
1978年 | 3篇 |
1977年 | 5篇 |
1976年 | 6篇 |
1975年 | 7篇 |
1974年 | 2篇 |
1973年 | 2篇 |
1972年 | 2篇 |
1958年 | 2篇 |
排序方式: 共有1568条查询结果,搜索用时 181 毫秒
1.
Henrik Lindstrm Eva Magnusson Anna Holmberg Sven Sdergren Sten-Eric Lindquist Anders Hagfeldt 《Solar Energy Materials & Solar Cells》2002,73(1):240
The present paper describes a new method for manufacturing a nanostructured porous layer of TiO2 on a conducting glass substrate for use in a dye-sensitized photoelectrochemical cell. The method involves deposition of a layer of semiconductor particles onto a conducting substrate and compression of the particle layer to form a mechanically stable, electrically conducting, and porous nanostructured film at room temperature. Photoelectrochemical characteristics and morphology of the resulting nanostructured films are presented. The potential use of the new manufacturing method in the future applications of nanostructured systems is discussed. 相似文献
2.
Winterhalter M. Klotz K.-H. Benz R. Arnold W.M. 《Industry Applications, IEEE Transactions on》1996,32(1):125-130
Electric field methods are powerful tools for cell characterization and manipulation. Important biotechnological applications, e.g., electrofusion of cells or electroinjection of macromolecules into living cells, rely on membrane breakdown. Despite the widespread use of these techniques, the process of membrane breakdown is poorly understood: a better understanding can be expected to lead to higher efficiencies. The present study used planar lipid bilayers in order to limit the number of experimental parameters. Membrane rupture was induced by careful application of short electric field pulses: measurement of the subsequent increase in membrane conductivity with time permitted the underlying mechanism to be characterized. The initial process of pore formation starts a few μs after the onset of the pulse, and the ensuing breakdown of the entire lipid membrane occurs within about a millisecond (pore widening velocity of a few cm/s). The kinetics of the pore-opening process could be influenced qualitatively by adding surfactants and lipid-attached macromolecules, respectively. Changing the effective mass per unit area of membrane, which could be brought about by using known percentages of lipids with covalently bound, hydrophilic polymers, allowed a model for the pore widening process to be quantitatively tested 相似文献
3.
4.
Sven Hovmöller 《Ultramicroscopy》1985,17(2):175-192
We present a family of techniques for the transmission electron microscope that generate surface zone-axis patterns. These patterns display the variation of the diffracted-beam intensity as a function of the angle of the incident electrons. The conditions of the experiments are those of reflection high-energy electron diffraction at near grazing incidence. The techniques are: surface convergent-beam diffraction, a surface analogue of the Tanaka method and a modified double-rocking scheme. Experimental results are presented for diffraction from surfaces of MgO and MoS2. We anticipate that surface zone-axis patterns (surface ZAPs) will become established as an important tool for surface characterization, especially when used in conjunction with high-resolution surface imaging and surface energy loss spectroscopy; surface ZAPs may be expected to play, in surface analysis, a role analogous to that played by convergent-beam diffraction in normal transmission electron microscopy. 相似文献
5.
Sven Beyer Christian Jacobi Daniel Kröning Dirk Leinenbach Wolfgang J. Paul 《International Journal on Software Tools for Technology Transfer (STTT)》2006,8(4-5):411-430
In the verified architecture microprocessor (VAMP) project we have designed, functionally verified, and synthesized a processor
with full DLX instruction set, delayed branch, Tomasulo scheduler, maskable nested precise interrupts, pipelined fully IEEE
compatible dual precision floating point unit with variable latency, and separate instruction and data caches. The verification
has been carried out in the theorem proving system PVS. The processor has been implemented on a Xilinx FPGA.
A shorter version of this article with the title “Instantiating uninterpreted functional units and memory system: functional
verification of the VAMP” appeared in [8]. The work reported here was done while all the authors were with Saarland University. 相似文献
6.
7.
Spariosu K. Leyva V. Reeder R.A. Klotz M.J. 《Quantum Electronics, IEEE Journal of》2006,42(2):182-186
A 1534-nm fiber laser pumped Er:YAG laser action at room temperature has been demonstrated with high efficiency at two emission wavelengths: 1645 and 1617 nm. Multiwatt continuous-wave power was demonstrated at both wavelengths and active electrooptic Q-switch operation with >90% Q-switch efficiency was achieved at 1645 nm. Etalon tuned wavelength selection showed excellent agreement with theoretical analysis. 相似文献
8.
JM Rabey H Bass U Bonuccelli D Brooks P Klotz AD Korczyn P Kraus P Martinez-Martin P Morrish W Van Sauten B Van Hilten 《Canadian Metallurgical Quarterly》1997,20(4):322-337
The extensive use of the Unified Parkinson's Disease Rating Scale (UPDRS) has revealed low interrater reliability in some items and redundancy in others. In view of these shortcomings, we have structured a new scale that includes a zero-to three-point scale for each item in the evaluation of PD. The mental axis includes memory, thought disorders, and depression. Activities of daily living (ADL) includes eight items: speech, eating, feeding, dressing, hygiene, handwriting, walking, and turning in bed. The motor examination includes eight items: speech, tremor, rest and posture, rigidity, finger tapping, arising from chair, gait, and postural stability. Complications of therapy were also included: dyskinesias, dystonia, motor fluctuations, and freezing episodes, collected by history. In addition, a global scoring for motor fluctuations that should complement the Hoehn and Yahr Scale was incorporated. In this report, we present a statistical analysis of the ADL, motor evaluation, and complications of therapy sections. Concerning the interrater reliability mean, Kendall's W values were >0.9 for most of the items in the Short Parkinson's Evaluation Scale (SPES). Kendall's W <0.8 (motor evaluation) was found for two items of the SPES and nine items of the UPDRS. The mean interrater reliability for both scales across all seven centers (seven Kendall's W for seven centers) (Mann-Whitney test) showed no statistical differences between the scales. Spearman's correlations between items of both scales were significant. Factor analysis of the SPES and UPDRS data revealed a four-factor solution that explained approximately 60% of the data. All participating centers found the SPES easier to apply and quicker to complete, when compared with the UPDRS. The results obtained strongly favor the introduction of SPES for clinical practice. 相似文献
9.
Summary It is demonstrated that dilute solution light —scattering experiments under ‘optical θconditions’ offer rapid and reliable
judgement of the interaction parameters in polymer blends. This has been verified with miscible blends of polystyrene with
poly(vinylmethylether) and with the immiscible pair polystyrene —poly(vinylisobutylether). The capabilities of the optical
θ-approach in order to derive the influence of polymerpolymer interaction on chain dimensions are discussed shortly.
Herrn Dr. B. Sedlacec zu seinem 60. Geburtstag herzlichst gewidmet 相似文献
10.
Jan H. Dring Julian Schrter Jerome Jüngling Saskia Biskup Kerstin A. Klotz Thomas Bast Tobias Dietel G. Christoph Korenke Sophie Christoph Heiko Brennenstuhl Guido Rubboli Rikke S. Mller Gaetan Lesca Yves Chaix Stefan Klker Georg F. Hoffmann Johannes R. Lemke Steffen Syrbe 《International journal of molecular sciences》2021,22(6)
Pathogenic variants in KCNA2, encoding for the voltage-gated potassium channel Kv1.2, have been identified as the cause for an evolving spectrum of neurological disorders. Affected individuals show early-onset developmental and epileptic encephalopathy, intellectual disability, and movement disorders resulting from cerebellar dysfunction. In addition, individuals with a milder course of epilepsy, complicated hereditary spastic paraplegia, and episodic ataxia have been reported. By analyzing phenotypic, functional, and genetic data from published reports and novel cases, we refine and further delineate phenotypic as well as functional subgroups of KCNA2-associated disorders. Carriers of variants, leading to complex and mixed channel dysfunction that are associated with a gain- and loss-of-potassium conductance, more often show early developmental abnormalities and an earlier onset of epilepsy compared to individuals with variants resulting in loss- or gain-of-function. We describe seven additional individuals harboring three known and the novel KCNA2 variants p.(Pro407Ala) and p.(Tyr417Cys). The location of variants reported here highlights the importance of the proline(405)–valine(406)–proline(407) (PVP) motif in transmembrane domain S6 as a mutational hotspot. A novel case of self-limited infantile seizures suggests a continuous clinical spectrum of KCNA2-related disorders. Our study provides further insights into the clinical spectrum, genotype–phenotype correlation, variability, and predicted functional impact of KCNA2 variants. 相似文献