全文获取类型
收费全文 | 68912篇 |
免费 | 5345篇 |
国内免费 | 2706篇 |
专业分类
电工技术 | 3398篇 |
技术理论 | 10篇 |
综合类 | 4070篇 |
化学工业 | 11800篇 |
金属工艺 | 3749篇 |
机械仪表 | 4324篇 |
建筑科学 | 5902篇 |
矿业工程 | 1984篇 |
能源动力 | 2072篇 |
轻工业 | 4206篇 |
水利工程 | 1090篇 |
石油天然气 | 4315篇 |
武器工业 | 538篇 |
无线电 | 8162篇 |
一般工业技术 | 8805篇 |
冶金工业 | 3463篇 |
原子能技术 | 779篇 |
自动化技术 | 8296篇 |
出版年
2024年 | 91篇 |
2023年 | 1058篇 |
2022年 | 1503篇 |
2021年 | 2372篇 |
2020年 | 1956篇 |
2019年 | 1736篇 |
2018年 | 1899篇 |
2017年 | 2191篇 |
2016年 | 1977篇 |
2015年 | 2634篇 |
2014年 | 3247篇 |
2013年 | 3892篇 |
2012年 | 4309篇 |
2011年 | 4534篇 |
2010年 | 3947篇 |
2009年 | 3735篇 |
2008年 | 3667篇 |
2007年 | 3663篇 |
2006年 | 3862篇 |
2005年 | 3338篇 |
2004年 | 2296篇 |
2003年 | 2007篇 |
2002年 | 1915篇 |
2001年 | 1738篇 |
2000年 | 1733篇 |
1999年 | 1985篇 |
1998年 | 1795篇 |
1997年 | 1458篇 |
1996年 | 1391篇 |
1995年 | 1076篇 |
1994年 | 1020篇 |
1993年 | 706篇 |
1992年 | 540篇 |
1991年 | 431篇 |
1990年 | 324篇 |
1989年 | 260篇 |
1988年 | 230篇 |
1987年 | 135篇 |
1986年 | 97篇 |
1985年 | 70篇 |
1984年 | 33篇 |
1983年 | 30篇 |
1982年 | 39篇 |
1981年 | 21篇 |
1980年 | 13篇 |
1979年 | 5篇 |
1978年 | 1篇 |
1976年 | 1篇 |
1959年 | 2篇 |
排序方式: 共有10000条查询结果,搜索用时 125 毫秒
51.
Yu-yan Yang Lin Fan Jiao Wang Yuan-duo Zhu Xu Li Xin-qi Wang Xu Yan Li Li Yu-jing Zhang Wen-jing Yang Xiao-yuan Yao Xian-liang Wang 《Indoor air》2021,31(5):1391-1401
Household fine particulate matter (PM2.5) pollution greatly impacts residents' health. To explore the current national situation of household PM2.5 pollution in China, a study was conducted based on literature published from 1998 to 2018. After extracting data from the literature in conformity with the requirements, the nationwide household-weighted mean concentration of household PM2.5 (HPL) was calculated. Subgroup analyses of spatial, geographic, and temporal differences were also done. The estimated overall HPL in China was 132.2 ± 117.7 μg/m3. HPL in the rural area (164.3 ± 104.5 μg/m3) was higher than that in the urban area (123.9 ± 122.3 μg/m3). For HPLs of indoor sampling sites, the kitchen was the highest, followed by the bedroom and living room. There were significant differences of geographic distributions. The HPLs in the South were higher than the North in four seasons. The inhaled dose of household PM2.5 among school-age children differed from provinces with the highest dose up to 5.9 μg/(kg·d). Countermeasures should be carried out to reduce indoor pollution and safeguard health urgently. 相似文献
52.
本文简述了酸水汽提工艺的发展概况和技术进展,详细介绍了煤化工酸水汽提装置实际运行中存在的几类主要问题,并提出切实可行的解决措施,具有一定的借鉴意义。 相似文献
53.
文章将重点阐述消防监督检查中对火灾隐患的认定,并从实际角度出发,充分的考虑可能存在的问题,具体问题具体分析,制定相应的解决对策,以保证消防监督检查工作能够顺利的开展. 相似文献
54.
在工程建设中,如用金属结构框架代替混凝土框架,在组装和吊装大型超高钢结构框架时,不能依赖于传统散装作业方法.为满足工程建设要求,需将大型钢结构框架合理划分成不同框架单元,在框架内安装设备与管道,吊装框架单元等. 相似文献
55.
Jun-Jie Xing Ju-Yuan Qiao Zhen Yang Xiao-Na Guo Ke-Xue Zhu 《International Journal of Food Science & Technology》2021,56(11):5609-5618
The effects of resting under ultrasonic treatment on the properties of whole wheat dough sheets and noodles were investigated. Compared with the control group, the resting time to reach the maximum breaking force and extensibility of whole wheat dough sheets treated with ultrasound was shortened by 20 min. The proportion of strongly bound water (T21) decreased, while the proportion of weakly bound water (T22) increased during resting, and the ultrasonic treatment could accelerate this moisture redistribution in the dough. The extent of the increase in gluten macropolymer and the decrease in –SH content of ultrasound-treated wheat dough was higher than that of the control one during the initial 5–15 min resting, which could be related to the improvement of whole wheat dough extensibility. Whole wheat noodles showed a better breaking distance for 10 min of ultrasonic-assisted resting. Ultrasonic treatment could be used to reduce the resting time of whole wheat dough sheets and improve the texture properties of noodles. 相似文献
56.
SiCNO ceramic is prepared by pyrolyzing modified polysilazane. Its microstructure feature, dielectric properties and charge transition mechanisms are studied based on the analysis of effects of pyrolysis temperature on AC electrical performance. The Tauc band and the energy states density at Fermi level are studied by ultraviolet absorption and dielectric tests. The charge transition in the silicon-based matrix was analyzed according to Jonscher's dielectric relaxation theory. Results show that SiCNO ceramic obtained at 1000–1300?°C is amorphous with chemical stability. Three types of charge transition, that is, excitation from deep traps into the delocalized bands and the corresponding reverse capture processes, hopping near the Fermi level, and localized hopping of an electron in a potential double well, are enhanced as annealing temperature increases, which occur within energy band of Si-based matrix. 相似文献
57.
Although tremendous efforts have been made to ensure fresh produce safety, various foodborne outbreaks and recalls occur annually. Most of the current intervention strategies are evaluated within a short timeframe (less than 1 h), leaving the behavior of the remaining pathogens unknown during subsequent storages. This review summarized outbreak and recall surveillance data from 2009 to 2018 obtained from government agencies in the United States to identify major safety concerns associated with fresh produce, discussed the postharvest handling of fresh produce and the limitations of current antimicrobial interventions, and reviewed the intervention strategies that have the potential to be applied in each storage stage at the commercial scale. One long-term (up to 12 months) prepacking storage (apples, pears, citrus among others) and three short-term (up to 3 months) postpacking storages were identified. During the prepacking storage, continuous application of gaseous ozone at low doses (≤1 ppm) is a feasible option. Proper concentration, adequate circulation, as well as excess gas destruction and ventilation systems are essential to commercial application. At the postpacking storage stages, continuous inhibition can be achieved through controlled release of gaseous chlorine dioxide in packaging, antimicrobial edible coatings, and biocontrol agents. During commercialization, factors that need to be taken into consideration include physicochemical properties of antimicrobials, impacts on fresh produce quality and sensory attributes, recontamination and cross-contamination, cost, and feasibility of large-scale production. To improve fresh produce safety and quality during storage, the collaboration between researchers and the fresh produce industry needs to be improved. 相似文献
58.
In this study, a two-dimensional finite element model is proposed to investigate the wear/fracture mechanisms of polycrystalline cubic boron nitride (PCBN) superabrasives in high-speed grinding process. The special geometric microstructures of PCBN grains are constructed by using the classic Voronoi tessellation technique, and cohesive elements are embedded into the geometric model of PCBN grains as the potential crack propagation paths for simulating the wear/fracture behaviours of PCBN grains under grinding loads. The effects of uncut chip thickness per grain (agmax) on the stress distribution characteristics and wear/fracture behaviours of PCBN grains during grinding are discussed in detail. Results show that the wear behaviour of PCBN grains during grinding mainly occurs around the grain vertex region; however, the fracture behaviour, leading to the quick failure of PCBN grains, is prone to appear around the grain–filler bonding interface, which is usually on the opposite side of the in-feed direction. Moreover, to separate the PCBN grains from the macro-fracture during grinding, the uncut chip thickness per grain should be kept smaller than 1.0?µm to prevent the unfavourable fracture behaviour from appearing around the grain–filler bonding interface. Furthermore, the corresponding single-grain grinding trials are performed to validate the numerical simulation results by evaluating the wear/fracture morphologies of the PCBN superabrasives in the actual grinding operation. 相似文献
59.
Ankit Garg He Huang Weiling Cai Narala Gangadhara Reddy Peinan Chen Yifan Han Viroon Kamchoom Shubham Gaurav Hong-Hu Zhu 《岩石力学与岩土工程学报(英文版)》2021,13(3):593-602
Biochar has been used as an environment-friendly enhancer to improve the hydraulic properties(e.g.suction and water retention) of soil.However,variations in densities alter the properties of the soil-biochar mix.Such density variations are observed in agriculture(loosely compacted) and engineering(densely compacted) applications.The influence of biochar amendment on gas permeability of soil has been barely investigated,especially for soil with diffe rent densities.The maj or obj ective of this study is to investigate the water retention capacity,and gas permeability of biochar-amended soil(BAS) with different biochar contents under varying degree of compaction(DOC) conditions.In-house produced novel biochar was mixed with the soil at different amendment rates(i.e.biochar contents of 0%,5% and 10%).All BAS samples were compacted at three DOCs(65%,80% and 95%) in polyvinyl chloride(PVC)tubes.Each soil column was subjected to drying-wetting cycles,during which soil suction,water content,and gas permeability were measured.A simplified theoretical framework for estimating the void ratio of BAS was proposed.The experimental results reveal that the addition of biochar significantly decreased gas permeability k_g as compared with that of bare soil(BS).However,the addition of 5%biochar is found to be optimum in decreasing kg with an increase of DOC(i.e.k_(g,65%) k_(g,80%) k_(g,95%)) at a relatively low suction range(200 kPa) because both biochar and compaction treatment reduce the connected pores. 相似文献
60.
Qian Li Xiaoman Zhu Yanli Xie Shilin Ren 《International Journal of Food Science & Technology》2021,56(1):178-184
This study investigated the antifungal activity and the potential antifungal mechanisms of 2-hydroxy-4-methoxybenzaldehyde (HMB) against Aspergillus flavus (A. flavus). The minimum inhibitory concentration (MIC) of HMB in preventing spore germination was 70 μg mL−1. HMB at MIC disrupted cell wall integrity by reducing the number of septa by 86.66% (P < 0.05) in mycelia and increased cell membrane permeability by about 14-fold (P < 0.05) evidenced by propidium iodide (PI) staining. Furthermore, HMB at MIC inhibited respiration by 33.33%. These results revealed that the antifungal activity of HMB against A. flavus could be attributed to the damaged cell wall integrity, cell membrane permeability and respiration metabolism. What’s more, A. flavus was completely restrained in corn kernels due to HMB. Therefore, HMB could be applied as an effective antifungal agent. 相似文献