全文获取类型
| 收费全文 | 306篇 |
| 免费 | 56篇 |
| 国内免费 | 9篇 |
专业分类
| 电工技术 | 17篇 |
| 综合类 | 11篇 |
| 化学工业 | 59篇 |
| 金属工艺 | 9篇 |
| 机械仪表 | 10篇 |
| 建筑科学 | 25篇 |
| 矿业工程 | 5篇 |
| 能源动力 | 4篇 |
| 轻工业 | 90篇 |
| 水利工程 | 12篇 |
| 石油天然气 | 1篇 |
| 武器工业 | 2篇 |
| 无线电 | 39篇 |
| 一般工业技术 | 37篇 |
| 冶金工业 | 4篇 |
| 原子能技术 | 1篇 |
| 自动化技术 | 45篇 |
出版年
| 2025年 | 10篇 |
| 2024年 | 57篇 |
| 2023年 | 37篇 |
| 2022年 | 48篇 |
| 2021年 | 56篇 |
| 2020年 | 39篇 |
| 2019年 | 27篇 |
| 2018年 | 22篇 |
| 2017年 | 15篇 |
| 2016年 | 7篇 |
| 2015年 | 10篇 |
| 2014年 | 16篇 |
| 2013年 | 11篇 |
| 2012年 | 6篇 |
| 2011年 | 6篇 |
| 2010年 | 1篇 |
| 2008年 | 2篇 |
| 2001年 | 1篇 |
排序方式： 共有371条查询结果，搜索用时 0 毫秒
101.
采用季铵型阳离子改性剂3-氯-2-羟丙基三甲基氯化铵(CHPTAC)对黏胶织物进行改性处理后用活性染料在无盐条件下进行染色,用商业用湿摩擦牢度提升剂FM-8对试样进行后整理.通过SEM观察改性试样发现,这一改性处理工艺对试样表面无损伤.研究表明,黏胶织物试样的最佳改性工艺参数为:CHPTAC用量80 g/L,改性温度70℃,NaOH用量20 g/L,Na2CO310 g/L.改性试样的上染率明显优于有盐染色织物,其k/s值和染色均匀度好于有盐染色织物,改性试样的干湿摩擦色牢度均可达4-5级. 相似文献
102.
103.
104.
A novel alkaline copper slurry that possesses a relatively high planarization performance is investigated under a low abrasive concentration.Based on the action mechanism of CMP,the feasibility of using one type of slurry in copper bulk elimination process and residual copper elimination process,with different process parameters,was analyzed.In addition,we investigated the regular change of abrasive concentration effect on copper and tantalum removal rate and within wafer non-uniformity(WIWNU) in CMP process.When the abrasive concentration is 3 wt%,in bulk elimination process,the copper removal rate achieves 6125 °/min,while WIWNU is 3.5%,simultaneously.In residual copper elimination process,the copper removal rate is approximately 2700°/min,while WIWNU is 2.8%.Nevertheless,the tantalum removal rate is 0 °/min,which indicates that barrier layer isn’t eliminated in residual copper elimination process.The planarization experimental results show that an excellent planarization performance is obtained with a relatively high copper removal rate in bulk elimination process.Meanwhile,after residual copper elimination process,the dishing value increased inconspicuously,in a controllable range,and the wafer surface roughness is only 0.326 nm(sq < 1 nm) after polishing.By comparison,the planarization performance and surface quality of alkaline slurry show almost no major differences with two kinds of commercial acid slurries after polishing.All experimental results are conducive to research and improvement of alkaline slurry in the future. 相似文献
105.
106.
Chongchong Qi Xinhang Xu Mengting Wu Qiusong Chen 《Journal of the American Ceramic Society》2022,105(5):3510-3520
The differences in hydration between β-C2S and M3-C3S, the main phases of silicate cement, have not been fully investigated. In this study, density functional theory calculations were used to investigate the structure and bond order of β-C2S and M3-C3S before and after the molecular and dissociative adsorption of single water atoms. The unit cell of M3-C3S was found to have some O atoms with lower bond orders than those in β-C2S, implying higher chemical reactivity of O atoms in M3-C3S. The total bond orders of water atoms generally decreased after molecular adsorption, but reductions were minimal, and there were even increases, when the hydrogen bonding among H and surface O atoms was very weak in several M3-C3S surfaces. In the case of dissociative adsorption, the bond orders of water O–H hydroxyl tended to increase, and the other bond orders among water atoms decreased sharply, even to zero in some cases. Moreover, the bond order variations of water atoms of β-C2S and M3-C3S in molecular adsorption were highly correlated with the adsorption energy, with correlation coefficients of 0.9070 and 0.8330, respectively. In both molecular and dissociative adsorption of β-C2S and M3-C3S, the total bond order among Ca atoms with other surface atoms decreased after the Ca atoms adsorbed water atoms. This phenomenon also appeared in the dissociative adsorption of surface O atoms. In M3-C3S, the total strength of the surface O atom bonded to other surface atoms after dissociative adsorption was similar to the strength of the surface O–H hydroxyl bond. The special O atoms in M3-C3S showed a clear layered arrangement on the surfaces. In the case of dissociative adsorption, H atoms were preferentially adsorbed to special O atoms in the surface layer. 相似文献
107.
Youwei Gu Jieru Wang Mengting Li Fei Zhong Jie Xiang Zhengxin Xu 《International journal of molecular sciences》2022,23(23)
Nobiletin (NOB) has attracted much attention owing to its outstanding bioactivities. This study aimed to investigate its anti-arrhythmic effect through electrophysiological and molecular docking studies. We assessed the anti-arrhythmic effects of NOB using aconitine-induced ventricular arrhythmia in a rat model and the electrophysiological effects of NOB on rat cardiomyocytes utilizing whole-cell patch-clamp techniques. Moreover, we investigated the binding characters of NOB with rNav1.5, rNav1.5/QQQ, and hNaV1.5 via docking analysis, comparing them with amiodarone and aconitine. NOB pretreatment delayed susceptibility to ventricular premature and ventricular tachycardia and decreased the incidence of fatal ventricular fibrillation. Whole-cell patch-clamp assays demonstrated that the peak current density of the voltage-gated Na+ channel current was reversibly reduced by NOB in a concentration-dependent manner. The steady-state activation and recovery curves were shifted in the positive direction along the voltage axis, and the steady-state inactivation curve was shifted in the negative direction along the voltage axis, as shown by gating kinetics. The molecular docking study showed NOB formed a π-π stacking interaction with rNav1.5 and rNav1.5/QQQ upon Phe-1762, which is the homolog to Phe-1760 in hNaV1.5 and plays an important role in antiarrhythmic action This study reveals that NOB may act as a class I sodium channel anti-arrhythmia agent. 相似文献
108.
Mingxuan Zhang Weiwei Miao Jian Dang Zhengyang Ding Shaqian Zhang Zeng Zeng Hao Tang Mengting Wu Zaichen Zhang Liang Wu 《International Journal of Communication Systems》2020,33(1)
Universal filtered multicarrier (UFMC) is a promising new waveform that eliminates cyclic prefix and performs filtering on a chunk of successive subcarriers. Therefore, it is suitable for applications with requirements on high spectral efficiency and low latency. However, the limited bandwidth may be an obstacle for reliable communication in frequency selective channels. This paper proposes a new transmitter structure for uplink wireless communication system based on UFMC waveform. The basic idea is to allow a user to transmit its information on more than one subband simultaneously, increasing its robustness against frequency selectivity. To eliminate the multiuser interference brought by the overlapped transmission strategy, an iterative receiver with parallel interference cancellation is designed. Rate analysis is provided to reveal the rationale of the proposed scheme. Simulations on the symbol error rate performance are conducted to validate the transceiver design. It is found that the proposed scheme outperforms existing UFMC design without sacrificing any other performance metrics with only moderately increased complexity. 相似文献
109.
Xusheng Zhang Mengting Wang Bingyan Feng Qiuyu Zhang Jia Tong Mingyong Wang Chengbiao Lu Shiyong Peng 《International journal of molecular sciences》2022,23(10)
Infantile neuronal ceroid lipofuscinosis (INCL), the most severe form of neuronal ceroid lipofuscinoses, is caused by mutations in the lysosomal enzyme palmitoyl protein thioesterase 1 (PPT1). Typical symptoms of this disease include progressive psychomotor developmental retardation, visual failure, seizures, and premature death. Here, we investigated seizure activity and relevant pathological changes in PPT1 knock-in mice (PPT1 KI). The behavior studies in this study demonstrated that PPT1 KI mice had no significant seizure activity until 7 months of age, and local field potentials also displayed epileptiform activity at the same age. The expression levels of Iba-1 and CD68 demonstrated, by Western blot analysis, the inflammatory cytokine TNF-α content measured with enzyme-linked immunosorbent assay, and the number of microglia demonstrated by immunohistochemistry (IHC) were significantly increased at age of 7 months, all of which indicate microglia activation at an age of seizure onset. The increased expression of GFAP were seen at an earlier age of 4 months, and such an increase reached its peak at age of 6 months, indicating that astrocyte activation precedes microglia. The purinergic P2X7 receptor (P2X7R) is an ATP-sensitive ionic channel that is highly expressed in microglia and is fundamental to microglial activation, proliferation, cytokines release and epilepsy. We show that the ATP concentration in hippocampal tissue in PPT1 KI mice was increased using an enhanced ATP assay kit and demonstrated that the antagonist of P2X7R, A-438079, significantly reduced seizures in PPT1 KI mice. In contrast to glial cell activation and proliferation, a significant reduction in synaptic proteins GABAAR was seen in PPT1 KI mice. These results indicate that seizure in PPT1 KI mice may be associated with microglial activation involved in ATP-sensitive P2X7R signaling and impaired inhibitory neurotransmission. 相似文献
110.
Mengting He Jiannan Jia Junjie Zhao Xvsheng Qiao Jincheng Du Xianping Fan 《Ceramics International》2021,47(3):2963-2980
Solid state lighting, including phosphor converted light-emitting diodes (LEDs) and laser diodes (LDs), have released high demand to develop thermally stable phosphors. For this purpose, inorganic glass-ceramics (GCs) embedded with phosphor particles can act as competitive candidates. They are superior to traditional phosphors or resin/silica composites through successfully overcoming thermal aging and color temperature drifting problems and simultaneously maintaining high luminescent efficiencies. Inorganic GC phosphors can be classified into devitrified glass-ceramics, PiG (Phosphor-in-Glass) and sintered glass-ceramics. This review summarized the recent progress on LED/LD GC phosphors from the aspects of design principles, synthesis methods, microstructure-property relationships and their application studies. In addition, some challenging issues (e.g., crystallization behavior of luminous phase in glass, corrosion behavior of phosphor by glass matrix) are also discussed in detail. Significant issues of glass-ceramics packed LED/LD, such as luminescence efficiency, chromaticity, correlated color temperature and color gamut, are sorted out as well. Potential research directions are further suggested for not only developing new glass-ceramic phosphors but feeding upon various practical application. 相似文献