全文获取类型
收费全文 | 80篇 |
免费 | 1篇 |
专业分类
化学工业 | 12篇 |
金属工艺 | 1篇 |
机械仪表 | 8篇 |
矿业工程 | 1篇 |
轻工业 | 4篇 |
水利工程 | 1篇 |
石油天然气 | 1篇 |
无线电 | 10篇 |
一般工业技术 | 27篇 |
冶金工业 | 6篇 |
原子能技术 | 1篇 |
自动化技术 | 9篇 |
出版年
2024年 | 1篇 |
2022年 | 1篇 |
2021年 | 3篇 |
2020年 | 2篇 |
2019年 | 1篇 |
2018年 | 1篇 |
2016年 | 4篇 |
2014年 | 3篇 |
2013年 | 7篇 |
2012年 | 4篇 |
2011年 | 2篇 |
2010年 | 3篇 |
2009年 | 7篇 |
2008年 | 6篇 |
2007年 | 3篇 |
2006年 | 1篇 |
2005年 | 1篇 |
2004年 | 5篇 |
2002年 | 2篇 |
2001年 | 1篇 |
1999年 | 2篇 |
1998年 | 2篇 |
1996年 | 1篇 |
1995年 | 2篇 |
1993年 | 1篇 |
1988年 | 1篇 |
1987年 | 3篇 |
1986年 | 1篇 |
1984年 | 1篇 |
1978年 | 1篇 |
1977年 | 1篇 |
1976年 | 1篇 |
1975年 | 1篇 |
1972年 | 1篇 |
1971年 | 2篇 |
1966年 | 1篇 |
1961年 | 1篇 |
排序方式: 共有81条查询结果,搜索用时 15 毫秒
11.
An α-helical region of protein molecule was considered in a model of nanotube. The molecule is in conditions of quantum excitations. Such model corresponds to a one-dimensional molecular nanocrystal with three molecules in an elementary cell at the presence of excitation. For the analysis of different types of conformational response of the α-helical area of the protein molecule on excitation, the nonlinear response of this area to the intramolecular quantum excitation caused by hydrolysis of adenosine triphosphate (ATP) is taken into account. It has been established that in the simplest case, three types of excitation are realized. As estimates show, each of them ‘serves’ different kinds of protein. The symmetrical type of excitation, most likely, is realized in the reduction of traversal-striped skeletal muscles. It has the highest excitation energy. This well protects from casual actions. Antisymmetric excitations have intermediate energy (between symmetrical and asymmetrical). They, most likely, are realized in membranous and nucleic proteins. It is shown that the conformational response of the α-helical region of the protein is (in angstroms) a quantity of order N
c
/5, where N
c
is the number of spiral turns. For the number of turns typical in this case: N
c
~ 10, displacement compounds are a quantity of order 2 Å. It qualitatively corresponds to observable values. Asymmetrical excitations have the lowest energy. Therefore, most likely, they are realized in enzymatic proteins. It was shown that at this type of excitation, the bending of the α-helix is formally directed to the opposite side with respect to the antisymmetric excitations. Also, it has a greater value than the antisymmetric case for N
c
≤ 14 and smaller for N
c
> 14.
PACS
92C05MCS
36.20.Ey 相似文献12.
An investigation of fast radiation annealing (FRA) of 75As+ -implanted silicon is presented which explores the influence of the following factors on the properties of the implanted layers compared with those of the same material subjected to an isochronal anneal under isothermal furnace annealing (IFA) conditions: the FRA power density (effectively the average temperature of the wafer); the orientation of the implanted layer with respect to the FRA source (face up to the source or face down); the implant dose and energy; the time schedule for the anneal; the distance of the wafer from the source and from a water-cooled platen. All experiments are conducted in a normal laboratory environment without the benefit of clean air. The principle variables studied are the spreading resistance profile and the sheet resistance. Significant differences are observed between IFA and FRA material. The most dramatic is that diffusion in the face-up FRA material is significantly less than that in the face-down FRA material. No explanation has been obtained to date for this difference. Devices made from these layers were tested. Excellent device results have been obtained on both types of annealed material. 相似文献
13.
A. N. Ionov E. O. Popov V. M. Svetlichnyi A. A. Pashkevich 《Technical Physics Letters》2004,30(7):566-568
We have studied the physical properties of a new class of field electron emitters representing metal cathodes covered by thin polymer films based on a soluble imide-siloxane copolymer. Polymer coating leads to an increase in the emission current and provides for a quite stable field electron emission of flat polished molybdenum and niobium cathodes. 相似文献
14.
Building Many-Core Processor-to-DRAM Networks with Monolithic CMOS Silicon Photonics 总被引:1,自引:0,他引:1
Batten Christopher Joshi Ajay Orcutt Jason Khilo Anatol Moss Benjamin Holzwarth Charles W. Popovic Milo A. Li Hanqing Smith Henry I. Hoyt Judy L. Kartner Franz X. Ram Rajeev J. Stojanovic Vladimir Asanovic Krste 《Micro, IEEE》2009,29(4):8-21
Silicon photonics is a promising technology for addressing memory bandwidth limitations in future many-core processors. This article first introduces a new monolithic silicon-photonic technology, which uses a standard bulk CMOS process to reduce costs and improve energy efficiency, and then explores the logical and physical implications of leveraging this technology in processor-to-memory networks. 相似文献
15.
Fornara A Johansson P Petersson K Gustafsson S Qin J Olsson E Ilver D Krozer A Muhammed M Johansson C 《Nano letters》2008,8(10):3423-3428
We developed nanoparticles with tailored magnetic properties for direct and sensitive detection of biomolecules in biological samples in a single step. Thermally blocked nanoparticles obtained by thermal hydrolysis, functionalized with specific ligands, are mixed with sample solutions, and the variation of the magnetic relaxation due to surface binding is used to detect the presence of biomolecules. The binding significantly increases the hydrodynamic volume of nanoparticles, thus changing their Brownian relaxation frequency which is measured by a specifically developed AC susceptometer. The system was tested for the presence of Brucella antibodies, a dangerous pathogen causing brucellosis with severe effects both on humans and animals, in serum samples from infected cows and the surface of the nanoparticles was functionalized with lipopolysaccharides (LPS) from Brucella abortus. The hydrodynamic volume of LPS-functionalized particles increased by 25-35% as a result of the binding of the antibodies, measured by changes in the susceptibility in an alternating magnetic field. The method has shown high sensitivity, with detection limit of 0.05 microg x mL(-1) of antibody in the biological samples without any pretreatment. This magnetic-based assay is very sensitive, cost-efficient, and versatile, giving a direct indication whether the animal is infected or not, making it suitable for point-of-care applications. The functionalization of tailored magnetic nanoparticles can be modified to suit numerous homogeneous assays for a wide range of applications. 相似文献
16.
Abstract Holographic self-amplification in amorphous As55Se45 and As65Se35 films has been studied. Results on this amplification over a wide range of initial diffraction efficiencies 10?5% < η0 < 1% are reported. The degree of amplification increases with decreasing η0. At fixed values of η0 and of the sample thickness, the maximum self-amplification corresponds to a period A = 2·0 μm of the grating hologram. An increase in the diffraction efficiency in the dark has been observed for the first time in As-Se films. 相似文献
17.
B. E. Parshin P. V. Muratov R. I. Pashkevich 《Power Technology and Engineering (formerly Hydrotechnical Construction)》2007,41(4):233-236
Operation of the Verkhne-Mutnovskaya Geothermal Power Plant (VMGPP) has revealed ineffective summer-time performance of air
condensers (AC), which is caused by an insufficient heat reserve. Four alternate schemes are examined for improvement of the
operational efficiency of the AC: replacement of the four-by five-tier heat-exchange modules; installation of high-output
fans; a combination of the first two schemes; and, installation of additional sections in each power-generating set. Based
on thermodynamic analysis that we have adapted for conditions at the VMGPP, it is established that the last alternate scheme
is optimal, andwill have a payback period of six years, and a heat reserve of more than 40%, a figure approaching requirements
now in force.
__________
Translated from élektricheskie Stantsii, No. 6, June 2007, pp. 40–43. 相似文献
18.
A three-criteria linear model is suggested for maximization of the gross domestic product (GDP), minimization of the use of fuel-and-energy resources, and maximization of the foreign-trade balance for the analysis and choice of alternative versions of the development of the real sector of the national economy. Based on the model, calculations are carried out with the use of the information on Belarus over the 1996–2000 period. Conclusions are made in accordance with the results of the performed investigations. 相似文献
19.
Hamad ML Kailasam S Brodsky AM Han R Higgins JP Thomas D Reed RA Burgess LW 《Applied spectroscopy》2005,59(1):16-25
An optical diagnostic method, grating light reflection spectroscopy (GLRS), has been demonstrated for the in situ monitoring of properties of heterogeneous matrices in industrial processes. The technique is based on measurements near the critical points of intensity and phase in waves reflected from a transmission diffraction grating in contact with a diagnostic sample. The features contained in the reflection spectrum near these thresholds allow for the simultaneous determination of the real and imaginary parts of the dielectric function of the sample. Using these data, the milling progress of highly concentrated fluid suspensions is observed as the material is milled from approximately 40 mm to 160 nm in diameter. A theoretical model that closely resembles experimentally determined spectra was constructed and applied in combination with principal components analysis (PCA) to demonstrate that GLRS can be used to closely monitor changes in the mean particle size of the nanomilled drug product. 相似文献
20.
A. I. Stognij M. V. Pashkevich N. N. Novitskii B. A. Gribkov V. L. Mironov A. A. Geras’kin V. A. Ketsko F. Fettar H. Garad 《Inorganic Materials》2011,47(8):869-875
This paper examines the effect of ion-beam sputtering conditions on the nucleation of Co nanofilms on Si(100). The argon ion
energy is shown to play a key role in determining the sputtering process. Sputtering a cobalt target with argon ions less
than 0.8 keV in energy produces granular layers. The cobalt layers grown at Ar+ ion energies above 1.2 keV are continuous even in the nucleation stage. The layers 1.2 to 2 nm in thickness have high resistivity
and are comparable in magnetic properties to bulk material. The high-energy component of the total flux of cobalt atoms ejected
from the target plays an important role in the initial stages of deposition, especially at argon ion energies from 1.2 to
2.2 keV. In the nucleation stage, the cobalt atoms have a finite penetration depth in the silicon substrate, where they give
up energy which facilitates the formation of a continuous layer in the initial stage of the process. 相似文献