全文获取类型
收费全文 | 27820篇 |
免费 | 3490篇 |
国内免费 | 2216篇 |
专业分类
电工技术 | 4607篇 |
技术理论 | 4篇 |
综合类 | 3698篇 |
化学工业 | 1589篇 |
金属工艺 | 798篇 |
机械仪表 | 2369篇 |
建筑科学 | 2800篇 |
矿业工程 | 953篇 |
能源动力 | 1160篇 |
轻工业 | 828篇 |
水利工程 | 684篇 |
石油天然气 | 961篇 |
武器工业 | 360篇 |
无线电 | 2412篇 |
一般工业技术 | 2078篇 |
冶金工业 | 884篇 |
原子能技术 | 186篇 |
自动化技术 | 7155篇 |
出版年
2024年 | 68篇 |
2023年 | 494篇 |
2022年 | 807篇 |
2021年 | 1031篇 |
2020年 | 1055篇 |
2019年 | 813篇 |
2018年 | 762篇 |
2017年 | 921篇 |
2016年 | 1009篇 |
2015年 | 1152篇 |
2014年 | 2038篇 |
2013年 | 1675篇 |
2012年 | 2198篇 |
2011年 | 2272篇 |
2010年 | 1750篇 |
2009年 | 1758篇 |
2008年 | 1746篇 |
2007年 | 2024篇 |
2006年 | 1892篇 |
2005年 | 1631篇 |
2004年 | 1263篇 |
2003年 | 1107篇 |
2002年 | 898篇 |
2001年 | 710篇 |
2000年 | 611篇 |
1999年 | 379篇 |
1998年 | 281篇 |
1997年 | 241篇 |
1996年 | 210篇 |
1995年 | 170篇 |
1994年 | 120篇 |
1993年 | 93篇 |
1992年 | 85篇 |
1991年 | 47篇 |
1990年 | 48篇 |
1989年 | 38篇 |
1988年 | 21篇 |
1987年 | 12篇 |
1986年 | 8篇 |
1985年 | 8篇 |
1984年 | 14篇 |
1983年 | 5篇 |
1982年 | 10篇 |
1981年 | 6篇 |
1979年 | 7篇 |
1966年 | 3篇 |
1965年 | 3篇 |
1962年 | 4篇 |
1957年 | 3篇 |
1955年 | 3篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
《Ceramics International》2022,48(11):15252-15260
The Co3O4, as a potential anode of lithium-ion batteries, has gained considerable attention because of high theoretical capacity. However, the Co3O4 is suffering from serious structure deterioration and rapid capacity fading due to its bulky volume change during cyclic charge/discharge process. Herein, to stabilize the lithium storage performance of the Co3O4 nanoparticles, a characteristic carbon scaffold (HPC) integrating hollow and porous structures has been fabricated by a well-designed method for the first time. The ultrafine Co3O4 nanoparticles are cleverly anchored on the HPC (HPC@Co3O4) and hence achieve significantly improved electrochemical properties including high capacity, improved reaction kinetics and outstanding cycle stability, showing high capacity of 1084.7 mAh g-1 after 200 cycles at 200 mA g-1 as well as 681.4 mAh g-1 after 300 cycles at 1000 mA g-1. The HPC@Co3O4 therefore shows good promising for application in advanced lithium-ion battery anodes. The results of the systematically material and electrochemical characterizations indicate that the synergistic effects of ultrafine Co3O4 nanoparticles and well-designed HPC scaffolds are responsible for the outstand performance of the HPC@Co3O4 anode. Moreover, this work can enrich the understanding and development of stable and high-performance metal oxide-based lithium-ion battery anodes for advanced lithium storage. 相似文献
2.
Juan José Burbano He/him Darío Marcelino Cabezas María Jimena Correa 《International Journal of Food Science & Technology》2022,57(8):4772-4781
Walnut flour (WF), a by-product of walnut oil production, is characterised by high polyunsaturated fatty acids, proteins, and fibre contents and presents suitability for bakery products. However, when using non-traditional ingredients, it is essential to evaluate the effect on the quality properties of the final product. So, this work aimed to assess the impact of WF on the technological, physicochemical, and sensory properties of gluten-free (GF) cakes. WF was added at a flour blend (cassava (CS) and maize (MS) starches and rice flour) at 0, 10%, 15%, and 20%. The results showed that WF modified starch gelatinisation, increased amylose–lipid complex (ALC) content, and made crumbs easier to chew. Besides, the total dietary fibre (TDF) and protein content significantly increased. Cakes with 15% WF presented the highest specific volume (SV) and no differences in overall acceptability with respect to control. Hence, WF is a suitable ingredient for gluten-free bakery products. 相似文献
3.
《International Journal of Hydrogen Energy》2022,47(85):36216-36231
The fuel cell/battery durability and hybrid system stability are major considerations for the power management of fuel cell hybrid electric bus (FCHEB) operating on complicated driving conditions. In this paper, a real time nonlinear adaptive control (NAC) with stability analyze is formulated for power management of FCHEB. Firstly, the mathematical model of hybrid power system is analyzed, which is established for control-oriented design. Furthermore, the NAC-based strategy with quadratic Lyapunov function is set up to guarantee the stability of closed-loop power system, and the power split between fuel cell and battery is controlled with the durability consideration. Finally, two real-time power management strategies, state machine control (SMC) and fuzzy logic control (FLC), are implemented to evaluate the performance of NAC-based strategy, and the simulation results suggest that the guaranteed stability of NAC-based strategy can efficiently prolong fuel cell/battery lifespan and provide better fuel consumption economy for FCHEB. 相似文献
4.
Software is a central component in the modern world and vastly affects the environment’s sustainability. The demand for energy and resource requirements is rising when producing hardware and software units. Literature study reveals that many studies focused on green hardware; however, limited efforts were made in the greenness of software products. Green software products are necessary to solve the issues and problems related to the long-term use of software, especially from a sustainability perspective. Without a proper mechanism for measuring the greenness of a particular software product executed in a specific environment, the mentioned benefits will not be attained. Currently, there are not enough works to address this problem, and the green status of software products is uncertain and unsure. This paper aims to identify the green measurements based on sustainable dimensions in a software product. The second objective is to reveal the relationships between the elements and measurements through empirical study. The study is conducted in two phases. The first phase is the theoretical phase, where the main components, measurements and practices that influence the sustainability of a software product are identified. The second phase is the empirical study that involved 103 respondents in Malaysia investigating current practices of green software in the industrial environment and further identifying the main sustainability dimensions and measurements and their impact on achieving green software products. This study has revealed seven green measurements of software product: Productivity, Usability, Cost Reduction, Employee Support, Energy Efficiency, Resource Efficiency and Tool Support. The relationships are statistically significant, with a significance level of less than 0.01 (p = 0.000). Thus, the hypothesised relationships were all accepted. The contributions of this study revolve around the research perspectives of the measurements to attain a green software product. 相似文献
5.
互联网通讯采取标准化模式主要以TCP/IP协议为载体,通讯的优越特性体现在同时具备便捷性与开放性,为办公提供很大的便利,但基于网络系统也会入侵病毒、也会给信息数据与办公体系安全性造成威胁,直接影响企业综合稳定发展。据此,为保障办公工作的顺利开展,本文对计算机网络办公自动化及安全策略进行详细分析。 相似文献
6.
目的 探索湖北恩施地区西兰卡普的可持续设计策略。方法 分析隐身于贫困乡村的西兰卡普的文化价值和经济价值,对其进行设计转化的重要性与可行性分析;对湖北恩施地区西兰卡普进行实地考察与调研,梳理其可持续发展中所面临的传承主体和市场竞争方面的典型性困境与原由;以设计赋能传统手工艺作为设计扶贫的重要手段,基于西兰卡普所面临的困局系统性地提出其可持续性发展的设计策略。结论 在设计扶贫中,应构建多元主体参与、协同合作的再创新机制,注重强化造血能力,塑造地域名片,围绕当代消费需求,结合数字化技术进行展销模式、产品供给的升级和创新设计,并整合优势资源,实现产业的融合发展。总之,系统性地对西兰卡普进行设计赋能,是西兰卡普获得可持续性发展效力并助力当地贫困乡村经济发展的有效路径。 相似文献
7.
Against the background of smart manufacturing and Industry 4.0, how to achieve real-time scheduling has become a problem to be solved. In this regard, automatic design for shop scheduling based on hyper-heuristics has been widely studied, and a number of reviews and scheduling algorithms have been presented. Few studies, however, have specifically discussed the technical points involved in algorithm development. This study, therefore, constructs a general framework for automatic design for shop scheduling strategies based on hyper-heuristics, and various state-of-the-art technical points in the development process are summarized. First, we summarize the existing types of shop scheduling strategies and classify them using a new classification method. Second, we summarize an automatic design algorithm for shop scheduling. Then, we investigate surrogate-assisted methods that are popular in the current algorithm field. Finally, current problems and challenges are discussed, and potential directions for future research are proposed. 相似文献
8.
为解决电镀砂轮磨削加工中容屑空间不足的问题,采用点胶微粘接的方法制备了磨料有序排布的电镀砂轮,分析了磨料粘接效果和镀层力学性能。通过SEM分析了磨料/镀层/导电胶的结合界面,并进行了干磨削试验。研究结果表明,直径约为磨料粒径40%的胶点可粘接住磨料,单个胶点上粘接多颗磨料的占比小于6%;双脉冲电镀工艺制备的镀层显微硬度大于500HV,表层残余应力小于100MPa,磨料/镀层/导电胶之间的界面贴合紧密,无明显缺陷;砂轮在磨削时没有出现磨料脱落现象。 相似文献
9.
Since researchers began studying the mechanism of flavonoids’ anticancer activity, little attention has been focused on the modulation of redox state in cells as a potential chemotherapeutic strategy. However, recent studies have begun identifying that the anticancer effect of flavonoids occurs both in their antioxidative activity which scavenges ROS and their prooxidative activity which generates ROS. Against this backdrop, this study attempts to achieve a comprehensive analysis of the individual and separate study findings regarding flavonoids’ modulation of redox state in cancer cells. It focuses on the mechanism behind the anticancer effect, and mostly on the modulation of redox potential by flavonoids such as quercetin, hesperetin, apigenin, genistein, epigallocatechin-3-gallate (EGCG), luteolin and kaempferol in both in vitro and animal models. In addition, the clinical applications of and bioavailability of flavonoids were reviewed to help build a treatment strategy based on flavonoids’ prooxidative potential. 相似文献
10.
Ning Wang Yinya Li Guoqing Qi Andong Sheng 《International Journal of Adaptive Control and Signal Processing》2019,33(7):1174-1188
This paper investigates the state estimation issue for a class of wireless sensor networks (WSNs) with the consideration of limited energy resources. First, a multirate estimation model is established, and then, a new event‐triggered two‐stage information fusion algorithm is developed based on the optimal fusion criterion weighted by matrices. Compared with the existing methods, the presented fusion algorithm can significantly reduce the communication cost in WSNs and save energy resources of sensors efficiently. Furthermore, by presetting a desired containment probability over the interval [0,1] with the developed event‐triggered mechanism, one can obtain a suitable compromise between the communication cost and the estimation accuracy. Finally, a numerical simulation for the WSN tracking system is given to demonstrate the effectiveness of the proposed method. 相似文献