首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   26篇
  免费   10篇
  国内免费   1篇
电工技术   4篇
化学工业   5篇
金属工艺   4篇
建筑科学   1篇
矿业工程   1篇
轻工业   7篇
水利工程   1篇
石油天然气   2篇
无线电   2篇
一般工业技术   7篇
自动化技术   3篇
  2024年   2篇
  2023年   5篇
  2022年   5篇
  2021年   3篇
  2019年   1篇
  2018年   3篇
  2017年   4篇
  2016年   2篇
  2015年   1篇
  2014年   4篇
  2013年   2篇
  2012年   1篇
  2010年   1篇
  2008年   2篇
  1995年   1篇
排序方式: 共有37条查询结果,搜索用时 15 毫秒
11.
12.
13.
Effects of different bambara groundnut protein isolates (BGPIs) at a level of 6 % (w/w) in combination with microbial transglutaminase (MTGase) at a concentration of 0.6 U g?1 surimi on gel properties of sardine (Sardinella albella) surimi were investigated. In the absence of MTGase, all BGPIs showed the adverse effect on gel-forming properties of surimi, as evidenced by the decreases in breaking force and deformation (P?<?0.05). When MTGase was incorporated, the increases in breaking force and deformation were found for all BGPIs used. Water-holding capacity of all gels was improved when BGPIs were added in combination with MTGase (P?<?0.05). Whiteness of gels slightly decreased with the addition of BGPIs; however, MTGase had no impact on whiteness (P?>?0.05). Surimi gel added with BGPI prepared from defatted flour with heat treatment in the presence of ethylenediaminetetraacetic acid (DF-BGPI-HE) and MTGase showed well-ordered network and exhibited the lowest peroxide value and thiobarbituric acid-reactive substances than those containing other BGPIs. Gel containing DF-BGPI-HE had negligible beany flavour. Additionally, DF-BGPI-HE had the lower amount of volatile compounds after storage of 30 days at room temperature than other BGPIs. Thus, the addition of DF-BGPI-HE and MTGase was an effective means to render sardine surimi gel with improved gel property and caused no beany flavour in resulting gel.  相似文献   
14.
通过建立反极性等离子切割的数值模型,模拟了不同参数下的等离子体热力学和动力学特征。结果表明,等离子体在枪体内被加热加速并在压缩孔道内达到峰值,而在扩散区域和工件切割腔内等离子体的温度和速度基本保持恒定;等离子枪体的几何尺寸(喷嘴直径和压缩孔道长度)和工艺参数(电流、离子气流量和喷嘴高度)对等离子体的温度和速度具有重要的影响。  相似文献   
15.
针对配电变压器故障特征提取困难、故障识别难度大的问题,提出一种将振动信号、自适应噪声完备集合经验模态分解 (CEEMDAN)与图卷积神经网络(GCN)三者有机结合的故障诊断方法。 首先,采用 CEEMDAN 对来自加速度传感器的振动信 号进行处理,获得一组固有模态分量(intrinsic modal function);其次求取边际谱信息作为特征向量;然后,对特征向量矩阵构造 无向加权完全图,并使用改进灰狼优化算法对高斯核带宽进行寻优;最后,搭建一个具备多通道和多连通的改进 GCN 模型进行 特征二次挖掘与故障分类。 与此同时,还在模型中加入一种名叫“峰值因子”指标实现对未知类型故障的辨识。 在实例分析 中,分别对油浸式和干式变压器进行故障模拟,提取不同状态的样本进行测试。 实验结果表明,所提方法对油浸式和干式变压 器的故障识别准确率分别达到 97. 73%和 95. 6%,优于其他两种对比方法。 在面对未知类型故障以及运行工况发生变化时,也 具备较高是识别能力。  相似文献   
16.
目前国内外关于断路器的状态检修均采用计划停电的模式,存在不能及时发现断路器存在的潜伏性缺陷的缺点,从而导致断路器故障引起的电网事故。研制了由机械振动测量终端、电场强度测量终端、回路电流测量终端以及智能诊断模块4套组件构成的断路器故障预警装置并开发了由健康评估、智能定级2个模块组成的断路器健康状态量化评估系统。对研制的故障预警装置和健康状态评估系统进行了现场验证,结果表明:所提故障预警装置首次实现了运行状态下高压开关振动、电场以及回路电流信号的非侵入式融合采集,大幅降低了测量装置安装工艺复杂度和安装风险,实现了断路器3类17种故障的精准预警;开发的健康状态量化评估系统实现了断路器近远期健康度的实时评估,降低了断路器运检成本。  相似文献   
17.
A number of CCK(2) antagonists have been reported to play an important role in controlling gastric acid-related conditions, nervous system related disorders and certain types of cancer. To obtain the helpful information for designing potent antagonists with novel structures and to investigate the quantitative structure-activity relationship of a group of 62 different CCK(2) receptor antagonists with varying structures and potencies, CoMFA, CoMSIA, and HQSAR studies were carried out on a series of 1,3,4-benzotriazepine-based CCK(2) receptor antagonists. QSAR models were derived from a training set of 49 compounds. By applying leave-one-out (LOO) cross-validation study, cross-validated (r(cv)(2)) values of 0.673 and 0.608 and non-cross-validated (r(ncv)(2)) values of 0.966 and 0.969 were obtained for the CoMFA and CoMSIA models, respectively. The predictive ability of the CoMFA and CoMSIA models was determined using a test set of 13 compounds, which gave predictive correlation coefficients (r(pred)(2)) of 0.793 and 0.786, respectively. HQSAR was also carried out as a complementary study, and the best HQSAR model was generated using atoms, bonds, hydrogen atoms, and chirality as fragment distinction with fragment size (2-5) and six components showing r(cv)(2) and r(ncv)(2) values of 0.744 and 0.918, respectively. CoMFA steric and electrostatic, CoMSIA hydrophobic and hydrogen bond acceptor fields, and HQSAR atomic contribution maps were used to analyze the structural features of the datasets that govern their antagonistic potency.  相似文献   
18.
Effects of various binary organic solvents at different temperatures on the removal of lipids and beany or grassy odour of Bambara groundnut flour were studied. The highest lipid removal was achieved at 60 °C (P < 0.05), regardless of binary organic solvents used. Under the optimal temperature, chloroform/methanol showed the highest lipid removal (87%), followed by hexane/isopropanol (78%). All binary solvents containing methanol had higher efficiency in removal of phospholipids, and inactivation of lipoxygenase and trypsin inhibitors, as compared to isopropanol containing solvents (P < 0.05). Based on FTIR spectra, lipids removed by methanol containing solvents had high content of phospholipids. The flours defatted by methanol containing solvents exhibited the lowest peroxide value, thiobarbituric acid-reactive substances and beany odour intensity than the non-defatted flour and those defatted by isopropanol containing solvents throughout the storage (P < 0.05) of 30 days at refrigerated and room temperatures. In general, chloroform/methanol was the most effective in inactivating lipoxygenase and trypsin inhibitors, retarding lipid oxidation as well as beany odour development in flour. Therefore, chloroform/methanol could be used to lower beany or grassy odour in Bambara groundnut flour.  相似文献   
19.
Food Science and Biotechnology - Influences of different extraction temperatures (50, 60, and 70&nbsp;°C) and time (3, 6, and 9&nbsp;h) on yield, physicochemical, and functional...  相似文献   
20.
为了验证Ar-N2混合气体对焊缝中各元素含量和焊缝铁素体数(FN值)的影响,对SS304L奥氏体不锈钢进行了4种比例的Ar-N2混合气体GTAW多层多道焊接试验,研究了4种Ar-N2比例对焊缝金属中各元素含量的影响,以及每条焊缝中各元素含量随着焊道层数的变化趋势。结果表明,不同保护气体类型的11种焊缝化学元素中,只有N元素随着保护气体中氮气比例的升高而明显增加,其它元素则没有明显的影响;经过汇总分析,认为由于稀释率的原因,导致各元素含量在同一保护气体焊缝中的规律为:C元素含量随着层数的增加而下降;Si,P,S和Nb元素含量随着层数的增加无明显上升或下降趋势;Mn,Ni,Cr,Mo和Cu元素含量随着层数的增加而上升;而N元素在纯氩气保护SG-A时的含量随着层数的增加而稍微下降,在SG-AN-0.5,SG-AN-1,SG-AN-1.5 3种保护气体中N元素含量随着层数的增加而上升;分析结果也表明,Creq/Nieq值和FN值有相同的变化趋势,都与氮气含量呈现反比关系。 创新点: 采用了阶梯式的多层多道焊,保留了各层焊缝的原始信息,验证了GTAW焊接方法在保护气体中添加氮气对奥氏体不锈钢焊缝各种化学元素成分的影响,为Ar-N2混合气体GTAW焊接奥氏体不锈钢在工程中的应用提供了可参考的试验数据。  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号