热法磷酸生产热能利用技术及装置

通过对目前热法磷酸生产技术状况的分析,介绍了热法磷酸生产热能利用技术及装置,从技术方案及特点、投资对比分析、环境保护方面论述了技术的可靠性和经济及环保的可行性。     

A large meta-analysis of the global prevalence rates of S. aureus and MRSA contamination of milk

ABSTRACT

Past reports have indicated a high prevalence of milk contaminated with Staphylococcus aureus (S. aureus) and methicillin-resistant Staphylococcus aureus (MRSA), but the pooled prevalence rates of S. aureus and MRSA in pasteurized and boiled cow's milk, raw cow's milk, and raw Caprinae milk (raw sheep's milk and raw goat's milk) and across different periods, continents, economic conditions and purchase locations remain inconsistent. We searched relevant articles published in PubMed, EMBASE, and Web of Science before July 2016. The Strengthening the Reporting of Observational Studies in Epidemiology (STROBE) Statement was used to evaluate the quality of 93 included studies. We observed that the pooled prevalence rates of S. aureus contamination in pasteurized and boiled cow's milk, raw cow's milk, and raw Caprinae milk were 15.4% (95% CI, 6.1–27.5%), 33.5% (95% CI, 29.5–37.7%) and 25.8% (95% CI, 17.5–35.0%), respectively. The pooled prevalence rates of MRSA contamination were 4.9% (95% CI, 0.0–15.7%), 2.3% (95% CI, 1.3–3.6%), and 1.1% (95% CI, 0.5–1.8%), respectively. The prevalence of S. aureus contamination in raw cow's milk increased over time. However, the pooled prevalence of raw cow's milk contaminated with S. aureus was lowest in European studies. These findings give an indication of the consequence of better milk regulation in Europe. High S. aureus prevalence rates in raw milk collected from farms and processing companies pose a potential threat to consumers. The implementation of good hygiene practices, appropriate health knowledge, and food safety principles at the farm level, as well as the prudent use of antibiotics in veterinary medicine and heat treatment before drinking, are necessary to reduce the potential risk of S. aureus and MRSA contamination.     

塔河油田12区奥陶系油藏溶洞充填机理及挖潜方向

塔河油田12区奥陶系油藏溶洞普遍发育,但受暗河沉积物和后期剥蚀改造作用的影响,溶洞充填比例高达33%,对完井段的选取和完井方式的制定带来极大的困难。为提高充填溶洞预测水平、深化充填机理认识、明确充填溶洞挖潜方向,以12区36口井的钻井、测井和录井资料为基础,综合应用岩溶地质识别、地震属性提取、地震反射特征对比、古地貌恢复等方法,对充填溶洞展开全面研究。结果表明：12区奥陶系发育暗河沉积型、地表河凸岸堆积型、敞口充填型和垮塌充填型等4种溶洞充填类型;存在粉砂岩、泥岩、垮塌角砾岩和方解石等4种溶洞充填物。同时,建立了3种充填溶洞地震预测方法：地震反射特征对比法、奥陶系中-下统顶面形态对比法、古地貌恢复法,并提出了3个挖潜方向：充填溶洞段内挖潜、充填溶洞段间挖潜和充填溶洞井间挖潜。     

基于ATmega128的测控系统的Modbus通信

结合实际课题,提出了在高压开关测试仪中实现Modbus通信接口模块并利用此通用模块将测试仪接入组态软件的思想,开发了基于 AVR微控制器的 Modbus通信接口模块,在此基础上完成了下位机通过 Modbus协议与上位组态软件的实时通信,最终实现了对高压开关测试系统的远程监控。将 Modbus协议做进 8 位的 AT mega128单片机进而实现远距离监控的做法思路新颖,既解决了上位机系统开发驱动程序困难的问题,又因采用已被广泛应用的Modbus协议而使该测试仪的系统集成能力大大增强。     

智能照明控制模型的研究

提出了一种基于模糊控制理论为基础的智能照明控制模型。该模型以符合人体生物钟规律的照度参考值曲线为依据,实现具体的调光过程构建。与传统照明控制模型相比,该模型增加了调节速度,并充分考虑到人自身的规律,在有效改善照明质量、提高工作效率的同时,能实现健康、舒适、节能的目标。     

TC4-DT钛合金电子束焊接接头疲劳断裂过程的原位观测

通过对TC4-DT钛合金焊接接头显微组织的观察和疲劳断裂过程的原位观测,分析了焊接接头的显微组织特征,研究了焊接接头的疲劳裂纹萌生与扩展行为.结果表明:TC4-DT焊接接头疲劳断裂于母材区,疲劳裂纹萌生于试样的边缘,裂纹既可以沿着初生α相扩展又能直接切过初生α相扩展,裂纹的萌生寿命占整个疲劳寿命的比例较大,裂纹的扩展寿命很短.     

测试条件对聚氯乙烯树脂稀溶液粘数的影响

聚氯乙烯树脂稀溶液粘数是聚氯乙烯树脂的一项重要指标,它的高低决定着产品的不同用途。本实验测试了几种不同测试条件如测试温度、黏度计毛细管直径、溶剂浓度等对聚氯乙烯树脂稀溶液粘数结果所产生的影响,通过实验数据的理论分析和计算,对原因进行了具体的分析。这些分析结果的获得对提高粘数分析的准确性,对于指导实际生产,规范检验操作,修订检验标准都有着重要的意义。     

一种新型超导直流故障限流器

与用于交流系统或双极直流系统的限流器不同,用于多端柔性直流系统的故障限流装置应能够在短路故障发生初期有效抑制故障电流的快速上升,避免在线路断路器动作之前换流器桥臂闭锁.针对这一性能要求提出了一种专门用于多端柔性直流电网中的新型超导故障限流器的基本结构和工作原理,并制作了原理验证样机.通过对原理验证样机开展的一系列实验,...     

连续化回收黄磷尾气副产甲酸的新系统研究

针对现有黄磷尾气回收利用技术的不足,开发了将黄磷尾气资源化回收与甲酸生产相结合的新型连续化工艺,该工艺以甲酸钠磷酸酸化法为核心,充分考虑了物系的高粘变粘特性和系统用能的合理性,能生产高品质低成本的甲酸产品。同时开发了多级酸化反应器,它采用反应、加热、冷凝回流于一体的集成式结构,分室操作且配置了与介质粘度相匹配的不同类型的搅拌器,具有结构紧凑、节能高效、适应面广的特点。     

A Fast Two-Tone Active Load-Pull Algorithm for Assessing the Non-linearity of RF Devices

Radio frequency(RF)devices used in modern wireless systems must meet increasingly complic-ated spectral constraints while still operating with high power effici...