全文获取类型
收费全文 | 1159篇 |
免费 | 50篇 |
国内免费 | 1篇 |
专业分类
电工技术 | 16篇 |
综合类 | 6篇 |
化学工业 | 355篇 |
金属工艺 | 12篇 |
机械仪表 | 53篇 |
建筑科学 | 34篇 |
矿业工程 | 1篇 |
能源动力 | 49篇 |
轻工业 | 130篇 |
水利工程 | 7篇 |
石油天然气 | 3篇 |
无线电 | 58篇 |
一般工业技术 | 152篇 |
冶金工业 | 56篇 |
原子能技术 | 15篇 |
自动化技术 | 263篇 |
出版年
2023年 | 13篇 |
2022年 | 74篇 |
2021年 | 84篇 |
2020年 | 33篇 |
2019年 | 33篇 |
2018年 | 27篇 |
2017年 | 30篇 |
2016年 | 54篇 |
2015年 | 24篇 |
2014年 | 44篇 |
2013年 | 97篇 |
2012年 | 82篇 |
2011年 | 68篇 |
2010年 | 57篇 |
2009年 | 57篇 |
2008年 | 49篇 |
2007年 | 51篇 |
2006年 | 37篇 |
2005年 | 40篇 |
2004年 | 26篇 |
2003年 | 36篇 |
2002年 | 24篇 |
2001年 | 15篇 |
2000年 | 14篇 |
1999年 | 16篇 |
1998年 | 13篇 |
1997年 | 18篇 |
1996年 | 13篇 |
1995年 | 8篇 |
1994年 | 10篇 |
1993年 | 6篇 |
1992年 | 3篇 |
1991年 | 3篇 |
1990年 | 2篇 |
1989年 | 5篇 |
1987年 | 2篇 |
1986年 | 3篇 |
1985年 | 2篇 |
1984年 | 4篇 |
1983年 | 3篇 |
1982年 | 8篇 |
1981年 | 4篇 |
1980年 | 2篇 |
1978年 | 2篇 |
1977年 | 2篇 |
1973年 | 4篇 |
1972年 | 1篇 |
1971年 | 1篇 |
1968年 | 1篇 |
1966年 | 1篇 |
排序方式: 共有1210条查询结果,搜索用时 31 毫秒
1.
Controllability of One Spin and Two Interacting Spins 总被引:1,自引:0,他引:1
Mathematics of Control, Signals, and Systems - ?We consider the problem of steering control for the systems of one spin ½ particle and two interacting spin ½ particles in an... 相似文献
2.
The paper presents a neural network model of the touch sensitivity circuit of the nematode Caenorhabditis elegans. We describe a serie of simulations in which neural networks are trained, using a genetic algorithm, to reproduce the habituation of the nematode's touch sensitive behavior. A lesion study of the network allows to make a direct comparison between the fine functioning of the model and the data collected in real organisms. The model accords well with the known neurobiological data and it suggests some hypotheses about the functioning of the neural circuit and of single neurons. 相似文献
3.
The problem of the non-causal inversion of linear multivariable discrete-time systems is analyzed in the geometric approach framework and is solved through the computation of convolution profiles which guarantee perfect tracking under the assumption of infinite-length preaction and postaction time intervals. It is shown how the shape of the convolution profiles is related to both the relative degree and the invariant zeros of the plant. A computational setting for the convolution profiles is derived by means of the standard geometric approach tools. Feasibility constraints are also taken into account. A possible implementation scheme, based on a finite impulse response system acting on a stabilized control loop, is provided. 相似文献
4.
5.
Giampiero Sacchetti Paola Pittia Manuela Biserni Gian G. Pinnavaia & Marco D. Rosa 《International Journal of Food Science & Technology》2003,38(2):135-143
Summary Ready‐to‐eat breakfast cereals immersed in milk undergo undesirable changes in texture because of sudden moisture uptake. The textural changes are ascribable to a plasticizing effect of water, which modifies the mechanical strength of products by softening the starch/protein matrix. In this work, some textural parameters of different cereal flakes were derived from the force–displacement curves monitored during 300 s of immersion in milk. Hardness loss, deformability increment and changes in the force–displacement curve profile were calculated and plotted against soaking time. The application of a sugar coating process to a model cereal flake increased the initial product hardness and improved the preservation of the textural parameters during immersion. The Peleg model closely fitted the experimental data, with regression coefficients from 0.967 to 0.999. 相似文献
6.
Gian Piero Zarri 《Artificial Intelligence and Law》2007,15(3):251-279
An application of Narrative Knowledge Representation Language (NKRL) techniques on (declassified) ‘terrorism in Southern Philippines’
documents has been carried out in the context of the IST Parmenides project. This paper describes some aspects of this work:
it is our belief, in fact, that the Knowledge Representation techniques and the Intelligent Information Retrieval tools used
in this experiment can be of some interest also in an ‘Ontological Modelling of Legal Events and Legal Reasoning’ context. 相似文献
7.
In this paper we analyze how supervised learning occurs in ecological neural networks, i.e. networks that interact with an
autonomous external environment and, therefore, at least partially determine with their behavior their own input. Using an
evolutionary method for selecting good teaching inputs we surprisingly find that to obtain a desired outputX it is better to use a teaching input different fromX. To explain this fact we claim that teaching inputs in ecological networks have two different effects: (a) to reduce the
discrepancy between the actual output of the network and the teaching input, (b) to modify the network's behavior and, as
a consequence, the network's learning experiences. Evolved teaching inputs appear to represent a compromise between these
two needs. We finally show that evolved teaching inputs that are allowed to change during the learning process function differently
at different stages of learning, first giving more weight to (b) and, later on, to (a). 相似文献
8.
AP Krapcho E Menta A Oliva R Di Domenico L Fiocchi ME Maresch CE Gallagher MP Hacker G Beggiolin FC Giuliani G Pezzoni S Spinelli 《Canadian Metallurgical Quarterly》1998,41(27):5429-5444
The synthesis and antitumor evaluation of 2, 5-disubstituted-indazolo[4,3-gh]isoquinolin-6(2H)-ones (9-aza-APs) are described. The key intermediates in the synthesis are benz[g]isoquinoline-5,10-diones which are substituted at positions 6 and 9 with groups of different nucleofugacity for SNAr displacements. The initial displacement of fluoride by a substituted hydrazine leads to the pyrazole analogues. Substitution of the remaining leaving group by an amine or BOC-protected amines leads to the 9-aza-APs 12. These analogues were converted into their maleate or hydrochloride salts 13. In two cases, namely, 13x and 13z, sidearm buildup was also employed in the synthetic pathway. In vitro evaluation of 9-aza-APs against the human colon tumor cell line LoVo uncovered for most of the compounds a cytotoxic potency lower than that of DuP-941 or mitoxantrone and comparable to that of doxorubicin. Only analogues 13c, 13n, and 13ff were as cytotoxic as DuP-941. Interestingly, while DuP-941 was highly cross-resistant in the LoVo cell line resistant to doxorubicin (LoVo/Dx), the 9-aza-APs carrying a distal lipophilic tertiary amine moiety in both chains were capable of overcoming the MDR resistance induced in this cell line. The 9-aza-APs show outstanding in vivo antitumor activity against both systemic P388 murine leukemia and MX-1 human mammary carcinoma transplanted in nude mice. At their optimal dosages, congeners 13a-c, 13f, 13n, 13q, 13x, and 13dd were highly effective against P388 leukemia with T/C% of 200-381, while the T/C% value of DuP-941 was 147. In the MX-1 tumor model, 24 compounds elicited percentages of tumor weight inhibitions (TWI) ranging from 50% to 99%. Congeners 13d, 13k, 13l, 13x, 13z, and 13ee emerged as the most effective ones, with TWI% 96, simliar to that of DuP-941 (TWI% = 95). On the basis of their efficacy profile in additional experimental tumors and lack of cardiotoxicity in preclinical models, two congeners have surfaced as potential clinical candidates. 相似文献
9.
Domenico Ferrari 《Multimedia Systems》1998,6(3):179-185
The research done by the Tenet Group in multimedia networking has reached a point where it may be useful to reflect on the
significance of its results for the current debate on how integrated-services internetworks should be designed. Such reflections
constitute the main subject of this paper. The principles of the work and the conclusions reached so far by the Tenet researchers
are discussed in the light of the conflict between the two major technologies being proposed to build future information infrastructures:
namely, the Internet and the ATM technologies. The Tenet approach suggests one feasible way for resolving the conflict to
the advantage of all the users of those infrastructures. This paper discusses various fundamental aspects of integrated-services
network design: the choice of the service model, the type of charging policy to be adopted, and the selection of a suitable
architecture. 相似文献
10.
The definite trend towards the use of large-diameter rebars and the introduction of high-strength steels (f
y=500 to 600 MPa) make it necessary to study the effects of longitudinal splitting on the steel-to-concrete bond. The study
of splitting effects requires firstly basic tests to be performed in order to gather experimental information on bond and
confinement stresses acting at the bar-to-concrete interface. For this purpose, three series of tests were recently carried
out at the Politecnico di Milano. The results make it possible to ascertain a few basic properties of the bond after concrete
splitting, and to formulate empirical constitutive laws regarding the stresses and the displacements (bar slip and opening
of the splitting crack). All specimens consisted of a short deformed bar embedded in a concrete block, which had a preformed
splitting crack in the plane passing through the bar axis: twelve specimens (Tests A and C) were fitted up with a round deformed
bar having crescent-shaped lugs (Db=18 mm); seven specimens (Tests B) were fitted up with a specially machined deformed bar having a rectangular cross-section
and straigth, lugs, so that concrete deterioration close to the bar could be investigated at the surface of the specimen,
by means of the moiré technique. The tests were carried out at constant slip rate, up to very large slip values (
); both the ascending and the descending branches of the stress-slip curves were measured, for four different values of the
opening of the splitting crack. The agreement among the results of the three series is generally satisfactory and often very
good: consequently, constitutive laws regarding the four main variables (crack opening and bar slip, shear and confinement
stresses) can be worked out, as will be shown in a companion paper on constitutive relationships and on concrete deterioration
at the bar-to-concrete interface. 相似文献