全文获取类型
收费全文 | 73篇 |
免费 | 16篇 |
国内免费 | 20篇 |
专业分类
电工技术 | 4篇 |
综合类 | 5篇 |
化学工业 | 24篇 |
金属工艺 | 1篇 |
机械仪表 | 4篇 |
建筑科学 | 2篇 |
能源动力 | 1篇 |
轻工业 | 11篇 |
水利工程 | 3篇 |
无线电 | 7篇 |
一般工业技术 | 3篇 |
冶金工业 | 1篇 |
自动化技术 | 43篇 |
出版年
2023年 | 1篇 |
2022年 | 5篇 |
2021年 | 7篇 |
2020年 | 7篇 |
2019年 | 3篇 |
2018年 | 3篇 |
2017年 | 5篇 |
2016年 | 4篇 |
2015年 | 5篇 |
2014年 | 8篇 |
2013年 | 11篇 |
2012年 | 7篇 |
2011年 | 4篇 |
2010年 | 6篇 |
2009年 | 7篇 |
2008年 | 3篇 |
2007年 | 3篇 |
2006年 | 4篇 |
2005年 | 2篇 |
2003年 | 2篇 |
2002年 | 3篇 |
2001年 | 2篇 |
1999年 | 1篇 |
1998年 | 2篇 |
1992年 | 1篇 |
1982年 | 1篇 |
1981年 | 1篇 |
1977年 | 1篇 |
排序方式: 共有109条查询结果,搜索用时 46 毫秒
1.
We have entirely sequenced a 10,835 bp segment of the right arm from chromosome III contained in the J11D and J11D-K3B GF clones. The segment contains seven open reading frames longer then 100 amino acids. Three of them, RVS161 (Urdaci et al., 1990; Crouzet et al., 1991), ADP1 (Purnelle et al., 1991) and PGK1 (Hitzeman et al., 1982) have been described previously. YCR10C encodes a putative membrane protein. YCR8W (encoding a putative protein kinase) and YCR14C extend inside the D10H (Skala et al., 1991) and 62B5-2D clones respectively. Four ARS elements previously reported by Palzkill et al. (1986) are located between RVS161 and YCR10C. 相似文献
2.
Amirah Mohammad-Sidik Jian Sun Ryoung Shin Zhizhong Song Youzheng Ning Elsa Matthus Katie A. Wilkins Julia M. Davies 《International journal of molecular sciences》2021,22(2)
Extracellular ATP (eATP) has long been established in animals as an important signalling molecule but this is less understood in plants. The identification of Arabidopsis thaliana DORN1 (Does Not Respond to Nucleotides) as the first plant eATP receptor has shown that it is fundamental to the elevation of cytosolic free Ca2+ ([Ca2+]cyt) as a possible second messenger. eATP causes other downstream responses such as increase in reactive oxygen species (ROS) and nitric oxide, plus changes in gene expression. The plasma membrane Ca2+ influx channels involved in eATP-induced [Ca2+]cyt increase remain unknown at the genetic level. Arabidopsis thaliana Annexin 1 has been found to mediate ROS-activated Ca2+ influx in root epidermis, consistent with its operating as a transport pathway. In this study, the loss of function Annexin 1 mutant was found to have impaired [Ca2+]cyt elevation in roots in response to eATP or eADP. Additionally, this annexin was implicated in modulating eATP-induced intracellular ROS accumulation in roots as well as expression of eATP-responsive genes. 相似文献
3.
4.
5.
Afshan Ardalan Matthew D. Smith Masoud Jelokhani-Niaraki 《International journal of molecular sciences》2022,23(3)
Higher concentration of protons in the mitochondrial intermembrane space compared to the matrix results in an electrochemical potential causing the back flux of protons to the matrix. This proton transport can take place through ATP synthase complex (leading to formation of ATP) or can occur via proton transporters of the mitochondrial carrier superfamily and/or membrane lipids. Some mitochondrial proton transporters, such as uncoupling proteins (UCPs), transport protons as their general regulating function; while others are symporters or antiporters, which use the proton gradient as a driving force to co-transport other substrates across the mitochondrial inner membrane (such as phosphate carrier, a symporter; or aspartate/glutamate transporter, an antiporter). Passage (or leakage) of protons across the inner membrane to matrix from any route other than ATP synthase negatively impacts ATP synthesis. The focus of this review is on regulated proton transport by UCPs. Recent findings on the structure and function of UCPs, and the related research methodologies, are also critically reviewed. Due to structural similarity of members of the mitochondrial carrier superfamily, several of the known structural features are potentially expandable to all members. Overall, this report provides a brief, yet comprehensive, overview of the current knowledge in the field. 相似文献
6.
7.
The availability of cheaper, more efficient small computers opened up the possibility for medium-sized firms to install their own EDP system. Nevertheless these firms do not make sufficient use of EDP. One major reason for this is the lack of management knowledge about good computer applications. The paper describes a way to close this gap.On the basis of pilot and empirical studies, a combination of introductory lectures, autodidacts studies, and concluding lectures is proposed.To support the small business management, a manual was first designed. This deals with the practical problems and decisions of small and medium sized firms. In order to achieve better training seminars were designed that combined information materials with other systems of learning. The methods and the contents of these seminars including various case studies is described. 相似文献
8.
针对一类典型的带有控制约束的非线性离散时间系统,提出了一种基于自适应动态规划(adaptive dynamic programmmg,ADP)算法的多设定值跟踪控制方法,并对其收敛性和稳定性做了严格分析.在ADP迭代跟踪控制的基础上,根据多模型控制的思想,设置阶梯状的参考轨迹,使得系统状态逐渐地跟踪到最终设定值,保证了系统的稳定性,极大地减小超调量,加快了响应时间,改善控制品质;同时由于控制器约束的存在,引入非二次型的性能指标函数,使得控制量始终在有界的范围内变化.最后对仿真结果进行了分析,结果表明了此方法的可行性和有效性. 相似文献
9.
在研究ADP结块原因和防结块措施的基础上,以硬脂酸(SA)为防潮剂,以水和水/无水乙醇混合溶液分别作为防潮剂溶剂,采用溶剂蒸发法对ADP进行防潮改性以达到降低其吸湿性和防结块的目的。研究了溶剂蒸发温度、搅拌速度、防潮剂含量、溶剂种类、溶剂加入体积等工艺条件对ADP复合材料粒度大小的影响,制备了不同工艺条件下的ADP复合材料,并对其粒度和吸湿性进行了测试。结果表明,当SA质量分数为3%,以15 mL水和15 mL无水乙醇混合溶液为溶剂,在90 ℃的蒸发温度下,搅拌速度为400 r/min,对ADP复合材料的防潮效果最佳,其粒度为50 μm,吸湿率由2.79%降为0.92%,并进行了理论分析。 相似文献
10.
以乙烯基硅油、含氢硅油为基础胶料,十六烷基三甲氧基硅烷改性氧化铝为导热填料,二乙基次膦酸铝(ADP)为阻燃剂,制得导热阻燃绝缘有机硅电子灌封胶。研究了改性氧化铝用量对灌封胶黏度、导热性、阻燃性的影响,观察了燃烧残余物的形貌。结果表明,这种改性氧化铝有低吸油值,填充量对灌封胶黏度影响小,所制备的灌封胶具有良好导热性能;而ADP不仅展现出对灌封胶良好的阻燃性,而且还能与改性氧化铝产生协效阻燃性和抑烟作用,同时灌封胶也具有良好的流动性、力学性能和电绝缘性能。当ADP用量50份、改性氧化铝用量600份时,灌封胶的黏度为8 500 mPa·s,硫化后胶条的热导率达2.12 W/m·K,垂直燃烧达到FV-0级,拉伸强度1.72 MPa,拉断伸长率62%,体积电阻率3.9×1012Ω·cm。 相似文献