全文获取类型
收费全文 | 59335篇 |
免费 | 6741篇 |
国内免费 | 5244篇 |
专业分类
电工技术 | 4141篇 |
技术理论 | 1篇 |
综合类 | 6217篇 |
化学工业 | 8854篇 |
金属工艺 | 5660篇 |
机械仪表 | 6803篇 |
建筑科学 | 6373篇 |
矿业工程 | 3367篇 |
能源动力 | 1626篇 |
轻工业 | 3137篇 |
水利工程 | 1695篇 |
石油天然气 | 3789篇 |
武器工业 | 865篇 |
无线电 | 2931篇 |
一般工业技术 | 6715篇 |
冶金工业 | 2270篇 |
原子能技术 | 479篇 |
自动化技术 | 6397篇 |
出版年
2024年 | 242篇 |
2023年 | 1532篇 |
2022年 | 2694篇 |
2021年 | 2919篇 |
2020年 | 2405篇 |
2019年 | 1967篇 |
2018年 | 1684篇 |
2017年 | 2019篇 |
2016年 | 2206篇 |
2015年 | 2279篇 |
2014年 | 3425篇 |
2013年 | 3178篇 |
2012年 | 4132篇 |
2011年 | 4477篇 |
2010年 | 3470篇 |
2009年 | 3658篇 |
2008年 | 3102篇 |
2007年 | 3960篇 |
2006年 | 3746篇 |
2005年 | 3075篇 |
2004年 | 2496篇 |
2003年 | 2274篇 |
2002年 | 1883篇 |
2001年 | 1496篇 |
2000年 | 1266篇 |
1999年 | 1066篇 |
1998年 | 894篇 |
1997年 | 673篇 |
1996年 | 591篇 |
1995年 | 518篇 |
1994年 | 453篇 |
1993年 | 308篇 |
1992年 | 256篇 |
1991年 | 219篇 |
1990年 | 158篇 |
1989年 | 129篇 |
1988年 | 108篇 |
1987年 | 49篇 |
1986年 | 39篇 |
1985年 | 48篇 |
1984年 | 32篇 |
1983年 | 30篇 |
1982年 | 20篇 |
1981年 | 11篇 |
1980年 | 28篇 |
1979年 | 19篇 |
1960年 | 6篇 |
1959年 | 11篇 |
1955年 | 9篇 |
1951年 | 10篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
光伏发电功率存在波动性,且光伏出力易受各种气象特征影响,传统TCN网络容易过度强化空间特性而弱化个体特性。针对上述问题,文中提出一种基于VMD和改进TCN的短期光伏发电功率预测模型。通过VMD将原始光伏发电功率时间序列分解为若干不同频率的模态分量,将各个模态分量以及相对应的气象数据输入至改进TCN网络进行建模学习。利用中心频率法确定VMD的最优分解模态分解个数。在传统TCN预测模型的基础上,使用DropBlock正则化取代Dropout正则化以达到抑制卷积层中信息协同的效果,并引入注意力机制自主挖掘并突出关键气象输入特征的影响,量化各气象因素对光伏发电的影响,从而提高预测精度。以江苏省某光伏电站真实数据为例进行仿真实验,结果表明所提预测方法的RMSE为0.62 MW,MAPE为2.03%。 相似文献
72.
《岩石力学与岩土工程学报(英文版)》2022,14(5):1626-1641
Understanding the spatiotemporal evolution of overburden deformation during coal mining is still a challenge in engineering practice due to the limitation of monitoring techniques. Taking the Yangliu Coal Mine as an example, a similarity model test was designed and conducted to investigate the deformation and failure mechanism of overlying rocks in this study. Distributed fiber optic sensing (DFOS), high-density electrical resistivity tomography (HD-ERT) and close-range photogrammetry (CRP) technologies were used in the test for comprehensive analyses. The combined use of the three methods facilitates the investigation of the spatiotemporal evolution characteristics of overburden deformation, showing that the mining-induced deformation of overburden strata was a dynamic evolution process. This process was accompanied by the formation, propagation, closure and redevelopment of separation cracks. Moreover, the key rock stratum with high strength and high-quality lithology played a crucial role in the whole process of overburden deformation. There were generally three failure modes of overburden rock layers, including bending and tension, overall shearing, and shearing and sliding. Shear failure often leads to overburden falling off in blocks, which poses a serious threat to mining safety. Therefore, real-time and accurate monitoring of overburden deformation is of great significance for the safe mining of underground coal seams. 相似文献
73.
《Ceramics International》2022,48(10):14141-14150
Ultralow-cement bauxite-corundum refractory castables are increasingly attracting attention because of the advantages in performance and cost. To improve its volume stability and high-temperature performance, andalusite and kyanite were incorporated into this type of refractory, respectively, and a comparative investigation of their effects on microstructure, thermo-mechanical properties, and slag corrosion resistance was carried out in this work. The expansion effects induced by the mullitization of these additives not only suppressed the sintering shrinkage but also made the matrix structure more compact and uniform, mainly owing to the generation of many new and strong mullite bonds. This improvement resulted in a significant increase in the refractoriness under load and creep resistance. This effect was far more pronounced for the andalusite-added castables, for which the RUL increased by 62 °C and the creep rate at the stationary stage decreased by 26%. Besides, adverse effects on microstructure and properties appeared when adding a higher amount of kyanite due to the excessive expansion. Moreover, the corrosion mechanisms of these refractory castables by refining slag were discussed, and the active role of andalusite addition in the corrosion resistance was also proposed. 相似文献
74.
胡孝昀 《机械制造与自动化》2021,50(1):57-60,88
采用扫描电子显微镜、金相显微组织观察分析、硬度测试、喷丸覆盖率检测和材质的化学成分分析等,对断裂失效的弹簧进行分析。检测结果表明:弹簧在试验前已经裂开,如控制好回火条件,可减少缺陷产生的可能。 相似文献
75.
《International Journal of Hydrogen Energy》2021,46(56):28709-28718
In this work, the crystal structure and hydrogen storage properties of V35Ti30Cr25Fe10, V35Ti30Cr25Mn10, V30Ti30Cr25Fe10Nb5 and V35Ti30Cr25Fe5Mn5 BCC-type high entropy alloys have been investigated. It was found that high entropy promotes the formation of BCC phase while large atomic difference (δ) has the opposite effect. Among the four alloys, the V35Ti30Cr25Mn10 alloy shows the highest hydrogen absorption capacity while the V35Ti30Cr26Fe5Mn5 alloy exhibits the highest reversible capacity. The cause of the loss of desorption capacity is mainly due to the high stability of the hydrides. The higher room-temperature desorption capacity of the V35Ti30Cr25Fe5Mn5 alloy is due to higher hydrogen desorption pressure. After pumping at 400 °C, the hydrides can return to the original BCC structure with only a small expansion in the cell volume. 相似文献
76.
本文针对西铭矿7号煤层蹬空开采可行性的问题,采用理论分析、数值模拟和现场实测等手段,对下部8、9号煤层工作面开采后的顶板覆岩破坏高度进行了研究,通过六种方法的结果对比分析,确定西铭矿7号煤层蹬空区域不可安全开采。 相似文献
77.
The increase in the production of acid gas consisting of H2S, CO2, and associated impurities such as ammonia and hydrocarbons from oil and gas plants and gasification facilities has stimulated the interest in the development of alternative means of acid gas utilization to produce hydrogen and sulfur, simultaneously. The present literature lacks a detailed reaction mechanism that can reliably predict the thermal destruction of NH3 and its blend with H2S and CO2 to facilitate process optimization and commercialization. In this paper, a detailed mechanism of NH3 pyrolysis is developed and is merged with the reactions of NH3 oxidation and H2S/CO2 thermal decomposition from our previous works. The mechanism is validated successfully using different sets of experimental data on the pyrolysis and oxidation of NH3, H2S, and CO2. The proposed mechanism predicts the experimental data on NH3 pyrolysis remarkably better than the existing mechanisms in the literature. The mechanism is used to investigate the effects of NH3 concentration (0–20%) and reactor temperature (1000–1800 K) on the thermal decomposition of H2S and CO2. A synergistic effect is observed in the simultaneous decomposition of NH3 and CO2, i.e., NH3 conversion is improved in the presence of CO2 and the decomposition CO2 to CO is enhanced in the presence of NH3. The presence of H2S suppressed NH3 conversion, while the conversion of H2S remained unchanged with increasing NH3 concentration at temperature below 1400 K due to the low conversion of NH3 (up to 18%). At temperature above 1400 K, NH3 conversion increased rapidly and it triggered a decrease in H2S conversion as well as the yields of H2 and S2. The major reactions involved in the decomposition of H2S, CO2, and NH3 and the production of major products such as H2, S2, and CO are identified. The detailed reaction mechanism can facilitate the design and optimization of acid gas thermal decomposition to produce hydrogen and sulfur, simultaneously. 相似文献
78.
Luis Dias Miguel Ribeiro Armando Leitão Luis Guimarães Leonel Carvalho Manuel A. Matos Ricardo J. Bessa 《Quality and Reliability Engineering International》2021,37(6):2834-2852
Electrical utilities apply condition monitoring on power transformers (PTs) to prevent unplanned outages and detect incipient faults. This monitoring is often done using dissolved gas analysis (DGA) coupled with engineering methods to interpret the data, however the obtained results lack accuracy and reproducibility. In order to improve accuracy, various advanced analytical methods have been proposed in the literature. Nonetheless, these methods are often hard to interpret by the decision-maker and require a substantial amount of failure records to be trained. In the context of the PTs, failure data quality is recurrently questionable, and failure records are scarce when compared to nonfailure records. This work tackles these challenges by proposing a novel unsupervised methodology for diagnosing PT condition. Differently from the supervised approaches in the literature, our method does not require the labeling of DGA records and incorporates a visual representation of the results in a 2D scatter plot to assist in interpretation. A modified clustering technique is used to classify the condition of different PTs using historical DGA data. Finally, well-known engineering methods are applied to interpret each of the obtained clusters. The approach was validated using data from two different real-world data sets provided by a generation company and a distribution system operator. The results highlight the advantages of the proposed approach and outperformed engineering methods (from IEC and IEEE standards) and companies legacy method. The approach was also validated on the public IEC TC10 database, showing the capability to achieve comparable accuracy with supervised learning methods from the literature. As a result of the methodology performance, both companies are currently using it in their daily DGA diagnosis. 相似文献
79.
通过现场调研和松动圈观测对望云矿15101工作面沿空煤巷0~450m段破坏进行了统计,得出沿空煤巷顶板偏向煤柱侧及煤柱帮不对称破坏的特点。根据这一特点提出采用偏向煤柱侧布置锚索及增加锚杆长度与直径和增加锚杆索数量的控制方法,在现场试验中取得良好控制效果。 相似文献
80.
Qiong Liu Min Zhang Bhesh Bhandari Chaohui Yang 《International Journal of Food Science & Technology》2021,56(5):2357-2364
Improvements of melting resistance and quality by modification of pork-skin jelly through enzymatic cross-linking were studied, and the mechanism of quality improvement was discussed in this work. Gel strength, springiness and chewiness of modified gel increased significantly (P < 0.05). Transglutaminase (TGase) also improved the viscoelasticity, stability and melting resistance of gel system, as proved by rheological analysis. Sensory evaluation showed that increase in texture need to be moderate and the utilisation of 0.6% TGase was the most appropriate for pork-skin jelly. Significant effects of TGase on inducing protein cross-link and aggregation were confirmed by determining rheology during enzyme treatment and cross-linking extent of pork-skin soup. Correlation analysis showed TGase could improve melting temperature and texture by facilitating cross-linking. Covalent interaction based on ε-(γ-glutamyl)-lysine induced by TGase could play the main role in these improvements. This study suggested that TGase could be applied to design gelatin-based food for tailored quality properties through enzymatic cross-linking. 相似文献