Research on charge and discharge performance of a new molten salt heat storage material

针对高效率太阳能热发电传热储热的需求,本工作对新型熔盐（LiNO₃：NaNO₃：KNO₃物质的量比例为2：3：5）进行了充放热传热性能研究。通过Fluent模拟结果表明最后熔化的区域是位于罐体底部的边角位置,为了在工程应用中防止此区域出现熔化死角,应增加熔化装置。通过充放热实验验证了模拟结果,实验研究结果表明罐体内的熔盐在加热过程中,是自上而下逐渐熔化的,且熔盐始终存在温度分层,而熔盐冷却凝固的过程并没有分层现象。     

壳聚糖及其衍生物在天然织物整理中的应用研究进展

壳聚糖具有良好的抗菌性、吸湿性、反应活性和成纤性,作为新型织物整理剂在纺织产业具有广泛的应用前景。本文综述了近年来壳聚糖及其衍生物在天然织物抗菌、染色、阻燃、防静电、抗紫外和防毡缩等整理中的应用,并就其赋予织物各项性能的机理及影响因素进行讨论。采用对壳聚糖进行改性、与金属化合物的复合使用和对织物表面进行超声、等离子等预处理的方法有利于改善其对织物的整理效果,并对织物的各项物理性能起积极作用。未来壳聚糖基整理剂可在加强某个单一性能的基础上,选择性地引入多个功能性基团,合成符合应用需求的环保型多功能整理剂。     

The combined effects of lysozyme and ascorbic acid on microstructure and properties of zein-based films

Edible zein-based films containing lysozyme(LY) and ascorbic acid(AA) were developed in the presence of polyethylene glycol 400(PEG 400), the combined effects of LY and AA on the microstructure, mechanical properties and release properties of developed zein films were investigated in detail. The results of microstructure characterization indicated that zein-based films became compact and smooth, and LY aggregates were well distributed in the zein matrix because of the simultaneous addition of LY and AA. The results of mechanical tests showed that because of the synergistic effects of LY and AA on zein film, elongation at break of zein-based film could be up to 138%, which was 34.5 times higher than that of zein control film. LY release tests showed that when the concentration of AA was less than 3.1 mg·cm~(-2), the release rate of LY significantly decreased by 33.7%, and the total release increased by 80.6%. While the release profiles of AA showed that the release rate and total release of AA from the films containing LY increased by approximately 68.9% and 61.7% than the films without LY. Good antioxidant and sustained antimicrobial activities were found for the developed zein films.     

舟载冲绞一体式水下清淤机研制

研制舟载冲绞一体式水下清淤机的目的是满足传统清淤设备不能水下作业的难题,改变了我国清淤装备落后的局面.解决人工抱水枪劳动强度大的难题,提高泥浆泵的科技含量,减少操作人员,降低劳动强度.     

Dy和Al对Fe-Co合金微波吸收性能的影响

采用高真空电弧熔炼和高能球磨相结合的方法制备 Dy-Fe-Co 和 Dy-Fe-Co-Al合金微粉,利用X射线衍射技术（XRD）、扫描电镜分析方法（SEM）和矢量网络分析仪对合金粉的相结构、颗粒形貌和吸波性能进行分析。研究发现：随着Dy的添加,DyxFe90-xCo10(x=6, 9, 12)合金的吸收峰从低频向高频移动;在低频端,Dy6Fe84Co10合金的微波吸收性能优于其他合金,在d=1.8 mm厚度下,其吸收峰出现在3.6 GHz处,峰值达到 –6.7 dB;Al的适当添加可有效改善Fe-Co合金在低频端的微波吸收性能。在d=1.8 mm厚度下,Dy12Fe70Co10Al8合金的吸收峰在5.4 GHz处,峰值达到 –9.2 dB,在3~6 GHz频率范围内其微波吸收性能优于Dy12Fe78Co10合金     

植物纤维多羟基醇的液化机理

采用有机溶剂萃取和柱层析相结合的方法,从麦秆液化混合液中,除得到大量降解多糖外,经分离提纯得到两种关键组分。利用核磁(1H-NMR,13C-NMR,DEPT)、质谱(MS)和红外(IR)等方法,分析得出产物1是乙酰丙酸聚乙二醇酯,产物2含有2分子苯环,是含有愈创木基木质素和对羟基苯基木质素结构单元的酯类化合物。通过产物的波谱数据分析其结构,并结合液化过程中酸值、羟值及残渣的变化,推导出植物纤维中木质素和纤维素液化的反应机理。     

电动汽车用新型轴向磁场车轮电机的设计

车轮电机由于取消了齿轮和机械差动器,减小了驱动链的组件,因而减小了整个驱动链的重量,提高整个系统的可靠性和效率。该文对一种新型的应用于电动车辆驱动的直驱轮用轴向磁场永磁同步电动机的进行了设计。电机的电枢铁心由各个在磁路上没有联系的定子极组成,省去了定子铁心轭部,电机结构简单易制造。采用等效磁路法对电机进行了电磁设计,并用有限元法进行了验证。设计和仿真结果证明所提议的结构是可行的。     

盘式永磁同步风力发电机的设计

本文介绍双转子单定子盘式永磁同步风力发电机的设计。用软磁复合(SMC)材料来形成定子铁心,同时采用结构简单的背靠背绕组,使电机的制造变得容易。用等效磁路法对5 kVA盘式永磁同步发电机进行了设计,并用有限元法对其进行了验证,计算和仿真结果表明此设计方案是可行的。     

Origin and accumulation of high-maturity oil and gas in deep parts of the Baxian Depression, Bohai Bay Basin, China

Great quantities of light oil and gas are produced from deep buried hill reservoirs at depths of 5,641 m to 6,027 m and 190 ℃ to 201 ℃ in the Niudong-1 Well, representing the deepest and hottest commercial hydrocarbons discovered in the Bohai Bay Basin in eastern China. This discovery suggests favorable exploration prospects for the deep parts of the basin. However, the discovery raises questions regarding the genesis and accumulation of hydrocarbons in deep reservoirs. Based on the geochemical features of the hydrocarbons and characteristics of the source rocks as well as thermal simulation experiments of hydrocarbon generation, we conclude that the oil and gas were generated from the highly mature Sha-4 Member （Es4） source rocks instead of thermal cracking of crude oils in earlier accumulations. The source kitchen with abnormal pressures and karsted carbonate reservoirs control the formation of high-maturity hydrocarbon accumulations in the buried hills （i.e., Niudong-1） in conjunction with several structural-lithologic traps in the ES4 reservoirs since the deposition of the upper Minghuazhen Formation. This means the oil and gas exploration potential in the deep parts of the Baxian Depression is probably high.     

处理好"三个方面"的关系是做好监理工作的重要保证

工程监理是一项工作难度很大的高技术性服务工作.它面对的是政府部门的严格管理与监督,建设单位的苛刻要求和施工单位的种种不规范行为.这就要求监理不仅要努力做好控制、管理和协调工作,而且还要正确处理好与政府管理部门的关系、与建设单位的关系、与施工单位的关系,争取他们对监理工作的理解和支持,形成合力,保证监理工作的顺利开展并取得良好的工作成果.