全文获取类型
收费全文 | 200773篇 |
免费 | 23123篇 |
国内免费 | 16637篇 |
专业分类
电工技术 | 18233篇 |
技术理论 | 10篇 |
综合类 | 17862篇 |
化学工业 | 28225篇 |
金属工艺 | 11719篇 |
机械仪表 | 10254篇 |
建筑科学 | 8324篇 |
矿业工程 | 5637篇 |
能源动力 | 4477篇 |
轻工业 | 7126篇 |
水利工程 | 3582篇 |
石油天然气 | 7332篇 |
武器工业 | 1836篇 |
无线电 | 31450篇 |
一般工业技术 | 23506篇 |
冶金工业 | 5755篇 |
原子能技术 | 1497篇 |
自动化技术 | 53708篇 |
出版年
2024年 | 1212篇 |
2023年 | 4083篇 |
2022年 | 7193篇 |
2021年 | 8229篇 |
2020年 | 7893篇 |
2019年 | 6339篇 |
2018年 | 5540篇 |
2017年 | 6577篇 |
2016年 | 7026篇 |
2015年 | 7727篇 |
2014年 | 11821篇 |
2013年 | 11493篇 |
2012年 | 13772篇 |
2011年 | 15993篇 |
2010年 | 12180篇 |
2009年 | 13247篇 |
2008年 | 12546篇 |
2007年 | 14048篇 |
2006年 | 12132篇 |
2005年 | 10839篇 |
2004年 | 8943篇 |
2003年 | 8045篇 |
2002年 | 6619篇 |
2001年 | 5043篇 |
2000年 | 4394篇 |
1999年 | 3638篇 |
1998年 | 2752篇 |
1997年 | 2271篇 |
1996年 | 1942篇 |
1995年 | 1506篇 |
1994年 | 1283篇 |
1993年 | 919篇 |
1992年 | 691篇 |
1991年 | 556篇 |
1990年 | 474篇 |
1989年 | 389篇 |
1988年 | 228篇 |
1987年 | 158篇 |
1986年 | 170篇 |
1985年 | 116篇 |
1984年 | 77篇 |
1983年 | 84篇 |
1982年 | 95篇 |
1981年 | 39篇 |
1980年 | 52篇 |
1979年 | 44篇 |
1978年 | 14篇 |
1977年 | 19篇 |
1976年 | 17篇 |
1975年 | 14篇 |
排序方式: 共有10000条查询结果,搜索用时 10 毫秒
1.
2.
3.
陈彦名 《电信工程技术与标准化》2015,(5)
介绍了目前最炙手可热的REST架构风格,该风格顺应Web2.0的兴起,完美的匹配了云计算时代来临的可扩展要求,在各种应用场景中都得到了充分的表现。根据其技术特点,分析了该风格的API在移动通信网络管理中的应用,从网管系统内部、网管系统之间以及网管系统与上层APP应用之间等多方面对是否适用于REST风格以及如何在合适的位置使用REST API进行了分析。 相似文献
4.
The aim of the research is evaluating the classification performances of eight different machine-learning methods on the antepartum cardiotocography (CTG) data. The classification is necessary to predict newborn health, especially for the critical cases. Cardiotocography is used for assisting the obstetricians’ to obtain detailed information during the pregnancy as a technique of measuring fetal well-being, essentially in pregnant women having potential complications. The obstetricians describe CTG shortly as a continuous electronic record of the baby's heart rate took from the mother's abdomen. The acquired information is necessary to visualize unhealthiness of the embryo and gives an opportunity for early intervention prior to happening a permanent impairment to the embryo. The aim of the machine learning methods is by using attributes of data obtained from the uterine contraction (UC) and fetal heart rate (FHR) signals to classify as pathological or normal. The dataset contains 1831 instances with 21 attributes, examined by applying the methods. In the paper, the highest accuracy displayed as 99.2%. 相似文献
5.
6.
Biosolids reduction model by return activated sludge ozonation was validated by simulating nitrification data compiled from our pilot-scale and the literature studies. Then, a global sensitivity analysis (GSA) was performed to identify influential and non-influential parameters for biosolids reduction efficiency, change in specific nitrification activity (SNA), and alteration to expected nitrification stability. In general, the model outputs were sensitive to operational and ozone reaction parameters, but not to biochemical parameters. For operational parameters, mainly temperature and initial solids retention time (SRT) influenced all model outputs. For biosolids reduction, increase in the degradability of the influent COD decreased the reduction efficiency. For SNA, the changes were highly dependent on the influent TKN/COD ratio. Our findings also imply that the stability of the nitrification process in ozonated systems should be enhanced at constant MLVSS for warm temperatures, but could be reduced at temperatures below 12 °C and aerated SRTs below 10 days. 相似文献
7.
In this paper, novel computing approach using three different models of feed-forward artificial neural networks (ANNs) are presented for the solution of initial value problem (IVP) based on first Painlevé equation. These mathematical models of ANNs are developed in an unsupervised manner with capability to satisfy the initial conditions exactly using log-sigmoid, radial basis and tan-sigmoid transfer functions in hidden layers to approximate the solution of the problem. The training of design parameters in each model is performed with sequential quadratic programming technique. The accuracy, convergence and effectiveness of the proposed schemes are evaluated on the basis of the results of statistical analyses through sufficient large number of independent runs with different number of neurons in each model as well. The comparisons of these results of proposed schemes with standard numerical and analytical solutions validate the correctness of the design models. 相似文献
8.
Molecular structure and granule morphology of native and heat‐moisture‐treated pinhão starch
下载免费PDF全文
![点击此处可从《International Journal of Food Science & Technology》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Vania Z. Pinto Khalid Moomand Nathan L. Vanier Rosana Colussi Franciene A. Villanova Elessandra R. Zavareze Loong‐Tak Lim Alvaro R. G. Dias 《International Journal of Food Science & Technology》2015,50(2):282-289
Pinhão seed is an unconventional source of starch and the pines grow up in native forests of southern Latin America. In this study, pinhão starch was adjusted at 15, 20 and 25% moisture content and heated to 100, 110 and 120 °C for 1 h. A decrease in λ max (starch/iodine complex) was observed as a result of increase in temperature and moisture content of HMT. The ratio of crystalline to amorphous phase in pinhão starch was determined via Fourier transform infra red by taking 1045/1022 band ratio. A decrease in crystallinity occurred as a result of HMT. Polarised light microscopy indicated a loss of birefringence of starch granules under 120 °C at 25% moisture content. Granule size distribution was further confirmed via scanning electron microscopy which showed the HMT effects. These results increased the understanding on molecular and structural properties of HMT pinhão starch and broadened its food and nonfood industrial applications. 相似文献
9.
Effect of gums on viability and β‐galactosidase activity of Lactobacillus spp. in milk drink during refrigerated storage
下载免费PDF全文
![点击此处可从《International Journal of Food Science & Technology》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Bernice D. Karlton‐Senaye Reza Tahergorabi Valerie L. Giddings Salam A. Ibrahim 《International Journal of Food Science & Technology》2015,50(1):32-40
The viability and β‐galactosidase activity of four Lactobacillus strains in milk drink containing gums during 28 days of refrigerated storage at 4 °C were assessed. The population of Lactobacillus rhamnosus GGB101 and Lactobacillus rhamnosus GGB103 were maintained, whereas the population of Lactobacillus reuteri DSM20016 and Lactobacillus reuteri SD2112 significantly decreased. The recommended level of 6 log CFU g?1 was exceeded for all tested trains throughout storage. The highest viable number of Lactobacillus rhamnosus GGB103 (8.76 ± 0.03 log CFU mL?1) was obtained in the product containing carrageenan–maltodextrin. The addition of guar–locust bean–carrageenan led to 20‐fold increase in the level of β‐galactosidase activity for L. rhamnosus GGB101 (1208 ± 2.12 Miller units mL?1) compared to the control (61 ± 2.83 Miller units mL?1). Our results suggested that gums could be added to milk to improve viability and enhance β‐galactosidase activity of Lactobacillus. 相似文献
10.