Inhibition of copper corrosion in aerated hydrochloric acid solution by heterocyclic compounds containing a mercapto group

Inhibition of copper corrosion by benzotriazole (BTA), 2-mercapto benzoxazole (MBO) and 2-mercapto benzimidazole (MBI) in 0.5 mol L⁻¹ HCl was investigated by weight-loss measurements, potentiodynamic polarization curves and electrochemical impedance spectroscopy. MBI was shown to be the most effective inhibitor among those tested. Potentiodynamic polarization results revealed that the three compounds acted as anodic inhibitors, particularly MBI strongly suppressed anodic current densities. Molecular structure parameters of BTA, MBO and MBI were obtained by using an MM2 forcefield program and PPP–SCF quantum chemical calculation. It was found that MBI has higher levels of HOMO and LUMO energy and the larger π-electron density.     

对切削提升系统的改造

本文对切削机的液压传动控制过程进行分析,对切削机存在的问题提出了改进措施。     

多重赋权模糊综合评价在采场结构参数优化中的应用

房柱交替式上向分层充填法是三山岛金矿深部采用的主要采矿方法,国内采用该方法的矿山所选取的结构参数大小不一,因此依靠工程经验类比难以得出适合矿山的采场参数。针对这个问题,结合三山岛金矿深部高应力、高岩爆倾向性的特点,通过数值模拟得到不同结构参数条件下采场一步采与二步采过程中盘区顶板沉降和采场内的位移,综合考虑相对生产能力、综合效率、设备匹配度、施工难度等因素,建立了采场参数的模糊综合评价模型。通过合理确定评价指标的隶属度函数,以及运用变异系数法、模糊判据法和熵值法的多重赋权优化确定各评价指标的权重,对列出的5种方案进行综合评价,确定了符合矿山实际条件的最优采场参数,从而保证了矿山的安全生产和经济效益。     

灰色关联分析法在青东凹陷储层评价中的应用

在利用灰色关联度分析法对青东凹陷碎屑岩储层评价的基础上,通过介绍该方法的基本原理,对研究区9口关键井、21个储层单元的物性参数定量评价,确定储层评价指标的权系数,进而对储层进行综合定量评价。实例应用结果表明:该方法能避免用单因素评价储层中出现评价结果相互矛盾、不唯一等问题;以储层砂层组为单元进行评价,评价结果更加精细;储层分类结果与油田实际勘探开发方向一致,吻合度很高;用灰色关联分析法进行储层评价,可以综合考虑各个参与评价的参数,避免单一的、不精确的数字化处理,量化评价结果,提高储层综合评价的准确度,使结果更为科学、客观、合理。     

用新模型综合评价油田开发效果的探讨

针对目前各种评价方法常用最大隶属度识别准则不适用性及权重确定问题,在对模糊层次评判和未确知测度模型研究的基础上,以兼顾主观偏好和客观信息的综合赋权法为依据,提出将合理反映主观认知程度的层次分析法和客观反映指标重要性的相似权二者结合起来,通过偏好系数科学合理的确定出评价指标权重,然后尝试用模糊评判模型对油藏进行评价、排序,以标准区间值识别准则代替最大隶属度识别准则,减少误判。该评价方法首次应用于某油区低渗透注水油藏的评价,取得了较好效果。与灰色聚类分析等评价模型比较,具有权重确定合理、识别合理的优点,提高了开发效果综合评价的可信度,对其他驱动类型的油藏开发效果评价具有一定的借鉴作用。     

Techno-economics of small wind electric generator projects for decentralized power supply in India

A techno-economic evaluation of small wind electric generator (SWEG) projects for providing decentralized power supply in remote locations in India is presented. SWEG projects that have either been implemented or are under implementation have been considered. The capital costs of the SWEG projects and sub-systems have been analysed. Levelised unit cost of electricity (LUCE) has been estimated for 19 select places located in different geographical regions of the country. The LUCE is found to vary in the range of Rs. 4.67–83.02/kWh (US$¹ 0.10–1.86/kWh) for wind electric generator projects in the capacity range 3.2–50 kW with annual mean wind speed variation in the range 5–10 m/s. Issues relating to their environmental impact(s), barriers to diffusion and institutional mechanism(s) to implement such projects have also been discussed.     

基于改进LBP的手指静脉识别算法

为进一步提高手指静脉识别算法识别率,在图像预处理阶段提出了将直方图均衡化算法与局部对比度增强算法相结合,在扩大静脉图像动态范围的同时增强图像的细节。在图像识别阶段,提出了一种基于局部二值模式(Local Binary Pattern,LBP)的改进算子用来描述图像局部纹理特征,并结合权重分配和分块LBP特征算法对图像进行特征提取。最后使用支持向量机(Support Vector Machine,SVM)算法对图像特征进行训练。实验结果表明,上述算法识别率高达99.33%,与传统的识别算法相比具有明显的准确率提高。     

Biochemical changes in groundnut pods due to infestation of bruchid Caryedon serratus (Olivier) under stored conditions

A study on the “Biochemical changes in groundnut pods due to infestation of bruchid, Caryedon serratus (Olivier) under stored conditions” was conducted at Department of Entomology, College of Agriculture, SVPUA&T, Meerut during August 2018 to February 2019. Results of the study showed that there was significant increase in weight loss of the groundnut pods (test varieties) with the increase in storage period i.e. 30, 90, and 150 DAS (days after storage). This significant increase in weight loss was due to infestation of groundnut bruchid. In addition to the weight loss, distinct differences in the biochemical components such as sugars, proteins, tannins, phenols were found in between infested and uninfested groundnut pods. A significant reduction in sugars, tannins, phenol whereas increase in protein content was noticed with the increase in the storage period i.e. 30, 90 and 150 DAS. Correlation studies relating weight loss and biochemical components from different groundnut varieties (resistant and susceptible) due to bruchid infestation were also worked out in the study. Pod sugar and pod protein content showed significant positive correlation with weight loss (positive effect on the development of the bruchid). While, pod tannins and pod phenols content showed significant negative correlation with weight loss (exerted a negative effect on the development of the bruchid).     

棉毛赛络纺包芯纱的生产

为了顺利纺制棉毛包芯纱并提高成纱包覆效果,对细纱机进行改造,安装了适应毛纱的退绕机构和张力控制方式,推导出理论最小外包棉纤维的号数,计算出棉在包芯纱中体积含量为60%时的包芯纱号数及粗纱定量,并对细纱工艺参数进行了优化设计.结果表明:纺制51 tex(18.4 tex)棉毛赛络纺包芯纱,芯纱张力控制在33 cN～35 cN为宜;两根粗纱的喂入间距以小为宜;捻系数以小为宜,但不能低于280;前罗拉速度偏小掌握,在240 r/min～280 r/min;后区罗拉中心距尽量放大至63 mm,纺制出的棉毛赛络包芯纱包覆效果好.     

加注罐内气体量对挤压式加注精度的影响

简述航天推进剂加注系统的定量方式,对挤压式加注中由加注罐内气体量变化对加注系统定量精度的影响进行分析和理论计算。分析结果表明,加注罐内气体量对加注系统定量精度影响显著。为消除加注罐内气体量变化对加注系统定量精度的影响,引入一种全新的地面定量方式,即电子秤和流量积算仪组合定量方式。详细介绍了其原理、组成,并通过试验验证了其合理性。同时通过试验测试结果和理论计算公式,得到加注罐内气枕部分推进剂蒸气的含量,为推进剂蒸气的处理提供依据。