全文获取类型
收费全文 | 15733篇 |
免费 | 875篇 |
国内免费 | 20篇 |
专业分类
电工技术 | 214篇 |
综合类 | 4篇 |
化学工业 | 4007篇 |
金属工艺 | 320篇 |
机械仪表 | 383篇 |
建筑科学 | 710篇 |
矿业工程 | 40篇 |
能源动力 | 511篇 |
轻工业 | 1916篇 |
水利工程 | 137篇 |
石油天然气 | 61篇 |
武器工业 | 2篇 |
无线电 | 1017篇 |
一般工业技术 | 2469篇 |
冶金工业 | 1976篇 |
原子能技术 | 109篇 |
自动化技术 | 2752篇 |
出版年
2023年 | 144篇 |
2022年 | 401篇 |
2021年 | 516篇 |
2020年 | 364篇 |
2019年 | 420篇 |
2018年 | 480篇 |
2017年 | 476篇 |
2016年 | 505篇 |
2015年 | 411篇 |
2014年 | 539篇 |
2013年 | 1136篇 |
2012年 | 848篇 |
2011年 | 1060篇 |
2010年 | 787篇 |
2009年 | 797篇 |
2008年 | 801篇 |
2007年 | 705篇 |
2006年 | 609篇 |
2005年 | 454篇 |
2004年 | 401篇 |
2003年 | 406篇 |
2002年 | 367篇 |
2001年 | 217篇 |
2000年 | 209篇 |
1999年 | 200篇 |
1998年 | 276篇 |
1997年 | 268篇 |
1996年 | 220篇 |
1995年 | 183篇 |
1994年 | 172篇 |
1993年 | 160篇 |
1992年 | 121篇 |
1991年 | 106篇 |
1990年 | 102篇 |
1989年 | 134篇 |
1988年 | 81篇 |
1987年 | 81篇 |
1986年 | 104篇 |
1985年 | 120篇 |
1984年 | 99篇 |
1983年 | 118篇 |
1982年 | 105篇 |
1981年 | 99篇 |
1980年 | 93篇 |
1979年 | 92篇 |
1978年 | 84篇 |
1977年 | 79篇 |
1976年 | 83篇 |
1975年 | 71篇 |
1973年 | 61篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
Alan Owens Sebastian M. Pascarelle Neil Gehrels Bonnard J. Teegarden 《Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment》1991,310(3):681-684
We have extended the empirical work of Vano et al.[1] relating the slope of the detector efficiency curve to the active volume for Ge detectors. The analysis was carried out using Monte Carlo techniques and covered a wide range of incident energies (200 keV-20 MeV) and active volumes (19.6 cm3–396 cm3). It is shown that the expression of Vano et al.[1] is only valid over the energy range 200 keV-3 MeV for active volumes <50 cm3. The upper bound decreases to 2 MeV for volumes of a few hundred cm3. The usable energy range can, however, be extended to 6 MeV by introducing higher order terms into the polynomial. Above this energy, the shape of the efficiency curve is better described by a non-linear function since linear forms fail simultaneously to fit large active volumes and high energies. We therefore propose a composite function which reduces to the form given in Vano et al. in the low energy/active volume limit. By comparison with the Monte Carlo results, it is estimated that relative efficiencies can be calculated to within 6% over the energy range 200 keV-20 MeV and active volumes 20 cm3–400 cm3. Since the largest errors occur for the smallest volumes, we recommend that for energies <3 MeV a two-fold approach be followed, i.e. using the expression of Vano et al.[1] for active volumes less than 50 cm3 and the proposed non-linear form for larger volumes. For high energy work (E > 3 MeV), we advocate the non-linear form. In this way, average errors can be kept 3%. Finally, we point out that the real power of the expression of Vano et al. lies not in predicting efficiencies, but active volumes. 相似文献
102.
The Steady radial distribution of chemical species in a wire‐to‐cylinder ozone generator filled with pure oxygen has been computed by applying four different plasma chemistry models of increasing complexity. The most complete model considers ten species (e, O2 +, O2 ?, O3 ?, O?, O2, O2(1Δg), O2(1∑g +), O and O3) and 79 reactions, including ionization by electron impact, electron attachment and detachment, electron-ion recombination, charge transfer, etc. The chemical model is coupled with the electrical model through Poisson's equation. The spatially averaged ozone density has been computed as a function of the current intensity and compared with the experimental values obtained by UV spectroscopy. 相似文献
103.
Anthony L. Andrady Carlos M. Nunez Bor‐Sen Chiou Saad A. Khan 《Polymer Engineering and Science》2002,42(11):2065-2071
The solution rheology of different generations of hyperbranched polyesters in N‐methyl‐2‐pyrrolidinone (NMP) solvent was examined in this study. The solutions exhibited Newtonian behavior over a wide range of polyester concentrations. Also, the relative viscosities of poly(amidoamine) (PAMAM) dendrimers in ethylenediamine were compared with those of the hyperbranched polyesters in NMP. Both types of dendritic polymers have relative viscosities that are exponential functions of their molar fraction in solution. The slopes of these relative viscosity curves show a linear relationship with respect to the generation number. PAMAM dendrimers have the greater slopes for each generation, reflecting their relatively larger intrinsic viscosity values. 相似文献
104.
This research focused on the syllable as a processing unit in handwriting. Participants wrote, in uppercase letters, words that had been visually presented. The interletter intervals provide information on the timing of motor production. In Experiment 1, French participants wrote words that shared the initial letters but had different syllable boundaries. In Experiment 2, French- and Spanish-speaking participants wrote cognates and pseudowords with a letter sequence that was always intrasyllabic in French and intersyllabic in Spanish. In Experiment 3, French-Spanish bilinguals wrote the cognates and pseudowords with the same type of sequences. In the 3 experiments, the critical interletter intervals were longer between syllables than within syllables, indicating that word syllable structure constrains motor production both in French and Spanish. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
105.
Summary Polymer composites have recently received a considerable amount of scientific and technological interest, because their properties
can be properly controlled, choosing the adequate doped particles, their size and concentrations, and the synthesis conditions.
In this work we report the synthesis and characterization of a polystyrene (PS) matrix doped with different concentrations
of iron nanoparticles.
X-ray diffraction and transmission electron microscopy were used to characterize the structure of the samples. The behaviour
of the d.c. electrical conductivity (σdc) and the complex permittivity (ε*=ε′-iε′′) as a function of frequency (100 Hz–10 MHz) reflects the important effect of the iron nanoparticles concentration in the
sample properties. A percolation threshold in the conductivity was observed at a critical concentration of iron nanoparticles.
A noticeable increase in the saturation magnetization and coercivity is observed with the rise of the iron nanoparticles concentration,
being thisbehaviour also noticed in the remanent magnetization. A rise of the initial a.c. susceptibility with the iron concentration
is also observed. 相似文献
106.
The issue of generic scaling laws able to adequately predict (within better than 20%) cratering in semi-infinite targets and perforations through finite thickness targets was revisited. The approach used was to apply physical logic for hydrodynamics in a consistent manner able to account for chunky-body impacts such that the only variables needed are those directly related to known material properties for both the impactor and target. The analyses were compared and verified versus CTH hydrodynamic code calculations and existing experimental data. Comparisons with previous scaling laws were also performed to identify which (if any) were good for generic purposes. This paper is a short synopsis of the full report [1] available through the NASA Langley Research Center, LDEF Science Office. 相似文献
107.
Experience with misspellings can be detrimental to subsequent spelling performance. Generating or being exposed to incorrect spellings between two successive spelling tests interfered with subsequent spelling accuracy of these same words in Experiments 1 and 2 (but not Experiment 3), as indicated by changes from correct to incorrect spellings (CI changes). Furthermore, significantly more CI changes occurred when a recognition test (with incorrect versions as distractors) followed a dictation test than when a second dictation test followed it. Repeatedly presented misspellings were rated as looking progressively more similar to the correct spelling across presentations (Experiment 3). These outcomes suggest that spelling tests that involve the discrimination of correct from incorrect versions may be ill advised. In addition, the instructional technique encouraging students to intentionally produce misspellings of words, for purposes of visual comparison, may be detrimental rather than helpful. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
108.
The objective of this paper is to present an analysis on the scale‐up procedure of two‐dimensional spouted beds. The task was carried out with three different beds measuring 0.15, 0.30 and 0.80 in width. The conditions of scale‐up were studied through geometrical similitude analysis. Some parameters of scale were adimensionalised, tested and validated in order to propose relationships capable of predicting values of dependent properties. Those relationships should be followed in a prototype of an equipment of industrial scale. The study permitted the development of correlations to predict values of maximum pressure drop, minimum spout velocity and maximum height of spouting. 相似文献
109.
C sar Ovalles Carlos Vallejos Tito Vasquez Iraima Rojas Ursula Ehrman Jose Luis Benitez Ronald Martinez 《Petroleum Science and Technology》2003,21(1):255-274
An extra-heavy crude oil underground upgrading process is described which involves the downhole addition of a hydrogen donor additive under steam injection conditions (280-315°C and residence times of at least 24-h). Laboratory experiments showed a 4° increase in the API gravity (from 9 to 12°) of the upgraded product, a two-fold reduction in the viscosity and, an approximately 8% decrease in the asphaltene content with respect to the original crude. Further increases on the temperature led to products with improved properties reaching 15°API at 315°C. It was found that the presence of the natural formation (catalysts) and methane (natural gas) is necessary to enhance the properties of the upgraded crude oil. From GC and GC-MS results a reaction pathway is proposed that involves hydrogen transfers from tetralin to the extra-heavy crude oil resulting in the formation of 1,2-dihydronaphthalene. This compound is then transformed into naphthalene, further upgrading of crude oil through hydrogen donation. The results of the experiments carried out in the presence and absence of the mineral formation and with an inert solid (SiC) strongly indicate that the former acts as a catalyst and not as a heat transfer matrix. Isotopic labeling studies (CD4 and 13CH4) give evidences that, most probably, methane is involved in the upgrading reactions. 相似文献
110.
Chorda tympani nerve (CT) transection in rats severely impairs NaCl taste detection. These rats can detect higher concentrations of NaCl, however, suggesting that remaining oral nerves maintain some salt sensibility. Rats were tested in a gustometer with a 2-response operant taste-detection task before and after sham surgery (n = 5), combined transection of the CT and the greater superficial petrosal nerves (GSP; 7x, n = 6), or transection of the glossopharyngeal nerve (GL; 9x, n = 4). Thresholds did not significantly change after sham surgery. Although the GL responds to NaCl and innervates nearly 60% of total taste buds, 9x surgery had no effect. However, 7x surgery increased NaCl detection threshold by ~2.5 log?? units, greater than that reported for CT transection alone. These results suggest that the GSP contributes to NaCl sensitivity in rats and also demonstrate that the GL and perhaps the superior laryngeal and lingual nerve proper can maintain some NaCl detectability at high concentrations. These findings confirm the primacy of the 7th nerve relative to the 9th nerve in sensibility of NaCl in the rat model. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献