A study of the influence of lanthanum fluoride on the tribological properties of bonded solid film lubricants and its mechanism of function

The influence of lanthanum fluoride (LaF₃) on the characteristics of phenolepoxy-bonded MoS₂ dry films was investigated. The functional mechanism was specifically studied using several analytical means. The results showed that the wear life of dry films containing a certain amount of LaF₃ was considerably increased over that of the films without LaF₃. However, the effect of LaF₃ on the friction coefficient of the dry films was shown to be negligible. It was found that the addition of LaF₃ is effective in reducing the oxidation tendency of MoS₂ in the films during the friction process. The reason for this is investigated by the authors.     

A novel complex network-based deep learning method for characterizing gas-liquid two-phase flow

Gas-liquid two-phase flow widely exits in production and transportation of petroleum industry.Characterizing gas-liquid flow and measuring flow parameters repre...     

松花江流域水利建设成就与展望

松花江是我国七大江河之一， 流经内蒙古、黑龙江、吉林和辽宁省， 流域面积５５６８ 万ｋｍ ２， 文中从流域规划、防洪体系建设、水土流失治理、生态环境保护、农田水利建设和城市水利建设等诸方面介绍了建国５０ 年来的重要成就和主要经验， 并对存在的问题进行了讨论， 提出了嫩江干流控制性枢纽工程的建设将成为下世纪初松花江流域水利建设的重点。     

AC600二次侧非能动应急堆芯余热排出系统实验装置及研究计划

ＡＣ６００二次侧非能动应急堆芯余热排出系统实验装置是一座大型非能动安全系统实验研究装置，在设计上，它以热工水力模拟理论及模拟准则为依据，在保持原型系统主要热工水力现象和过程的前提下，对系统进行了必要的简化，本文介绍了该实验装置回路，电气，仪表及测控系统的设计原则和设计结果，以及第一阶段研究计划和内容，最后，根据调试和运行结果总结了设计特点和经验。     

三相异步电动机常用的降压启动控制线路

针对工农业生产中使用的三相异步电动机全压启动电流较大,对电动机和供电线路有损坏以及电动机功率和负载较大的问题,介绍和分析了几种经济有效的降压启动方式.     

基于单调初等函数的缓冲算子构造

在灰色系统缓冲算子公理体系下,将缓冲算子的构建和函数联系起来,利用基本初等函数(指数函数和余切函数)构造了2大类新的缓冲算子,并研究了其特性,最后通过实例验证了所构造的缓冲算子的实用性.解决了冲击扰动系统数据序列建模预测过程中常常出现的定量预测结果与定性分析结论不符的问题.     

反应媒循环法从湿法磷酸制饲料磷酸二铵的实验研究

本文对用三聚氰胺（ｍｅｌ）作反应媒，直接采用～２０％Ｐ２Ｏ５的低浓度湿法磷酸为原料，把净化与产品生产结合起来，生产出饲料磷酸二铵的新工艺进行了实验研究。结果表明：在适宜工艺条件下，制得的磷酸二铵产品质量达到了饲料级要求。此法具有工艺过程简单，能耗低，能实现“肥盐结合”等特点，是一条适合我国资源特点的新颖的技术路线。     

Study on the evaluation and compensating strategy for the wear damage of non-return valve during injection molding process

Injection molding (IM) is one of the most essential forming methods for plastics. However, some potential risks which influence part quality may occur in the molding process. A non-return valve (NRV) is a major component on the screw head whose function is to seal during the injection process to prevent the backflow of the melt. The NRV will wear in this process and cause fluctuations in parameters and quality but the wear states of NRVs cannot be monitored without the disassembly of the injection barrel. In this study, we proposed an optimization method to compensate for the wear damage of the NRVs. The V/P switchover point in each molding cycle was recalculated and output to stabilize the part quality. As a result, the wear damage of the NRV on the current machine was able to be predicted and the part quality could be initially optimized in the condition that the NRV had a degree of wear. The experimental results reveal that our proposed compensation algorithm can monitor the type of wear of NRV online, and at the same time, it can compensate the axial wear of NRV and finally improve the consistency of product weight, which established a fundamental for further research in the future.     

Preparation of solid acid catalyst packing AAO/SBA-15-SO3H and application for dehydration of xylose to furfural

The solid acid catalyst packing AAO/SBA-15-SO₃H was prepared by the co-condensation and grafting method with porous anodic aluminum oxide (AAO) as support. FT-IR, SEM and TEM were applied to characterize the prepared samples. Results showed that catalysts prepared by two methods both contained active centers, and SBA-15 nanorod arrays grow inside a porous alumina membrane AAO and are perpendicular to the substrate. Their catalytic performances were tested for dehydration of xylose to furfural. The conversion of xylose and selectivity of furfural were 90% and 74% on the AAO/SBA-15-SO₃H(C) catalyst prepared by the co-condensation method, respectively. The deactivation and regeneration of the AAO/SBA-15-SO₃H(C) catalyst for the dehydration of xylose were also investigated, the activity of catalyst treated by 30 wt.% H₂O₂ almost was recovered.