明珠线二期工程东安路站环境保护方案设计

介绍上海轨道交通明珠线东安路站的工程规模及施工场地的特殊性。车站基坑周边有数幢已建及在建居民楼距基坑不足 10m ,需严格保护 ,要求差异沉降 <1 2 5 0 0。为达到这样的环境保护等级 ,设计中采取了一系列措施 ,从设计方案、施工组织、环境检测以及补救措施等各方面入手 ,并全程跟踪施工过程 ,保证了基坑及建筑物的安全     

基于BIM的智慧园区综合运营管理平台建设探讨

通过建设基于BIM的智慧园区综合运营管理平台,从C端访客互动、提升员工满意度和园区科技管理方面着手,通过将智慧访客、智慧安防、智能监控、智慧食堂、智慧能源、智慧设施管理等系统的管理集成到园区综合运营管理平台上,达到完善安全管理、增强客户互动、降低人工成本、保证运行品质、降低运行能耗的目的 .     

中国国家博物馆改扩建工程新馆结构设计

中国国家博物馆改扩建工程新馆主体结构采用钢筋混凝土多筒体-部分框架结构体系,楼层及屋顶大跨部分采用钢桁架结构。根据材料优缺点、施工特点等进行多方案分析比较,确定展厅、报告厅、演播室等楼盖结构选用后张有粘结预应力混凝土梁,钢桁架结构楼层采用钢筋桁架组合楼板。根据基础受力特点,经方案比选,新建部分基础采用桩筏基础,并进行了地基基础沉降协调分析,采用桩底桩侧后压浆技术大幅提高了单桩承载力,节约造价明显。在工程中采用了型钢混凝土结构以及钢板混凝土组合剪力墙等组合结构。设计中进行了抗震性能化分析以及型钢混凝土结构连接节点等分析研究。     

搅拌摩擦焊接头形成过程分析

基于搅拌摩擦焊三维模型的切面分析方法,建立了焊接过程中接头切面的演变行为,将搅拌摩擦焊接头形成过程分为挤出阶段、迁移阶段、回填阶段和轴肩作用阶段四个阶段,对搅拌针作用下材料迁移过程进行了分析,指出挤出阶段将原始对接面及其表面氧化物迁移到后退侧,迁移阶段实现洋葱环层状组织的形成,并实现氧化物的碎化、弥散,回填阶段完成洋葱环形貌的最终成形.结果表明,采用切面分析法建立的接头形成过程四阶段能够较好地解释搅拌摩擦焊接头形成机制以及"S线"等缺陷的产生原因.     

A Mutant of Bacillus Subtilis with High-Producing Surfactin by Ion Beam Implantation

In order to generate a mutant of Bacillus subtilis with enhanced surface activity through low energy nitrogen ion beam implantation, the effects of energy and dose of ions implanted were studied. The morphological changes in the bacteria were observed by scanning electron microscope （SEM）. The optimum condition of ions implantation, 20 keV of energy and 2.6 × 10^15N^＋/cm^2 in dose, was determined. A mutant, B.s-E-8 was obtained, whose surface activity of 50-fold and 100-fold diluted cell-free Landy medium was as 5.6-fold and 17.4-fold as the wild strain. The microbial growth and biosurfactant production of both the mutant and the wild strain were compared. After purified by ultrafiltration and SOURCE 15PHE, the biosurfactant was determined to be a complex of surfactin family through analysis of electrospray ionization mass spectrum （ESI/MS） and there was an interesting finding that after the ion beam implantation the intensities of the components were different from the wild type strain.     

Improvement of Vitamin K2 Production by Escherichia sp.with Nitrogen Ion Beam Implantation Induction

Low-energy ion implantation as a novel mutagen has been increasingly applied in the microbial mutagenesis for its higher mutation frequency and wider mutation spectra.In this work,N~+ ion beam implantation was used to enhance Escherichia sp.in vitamin K_2 yield.Optimization of process parameters under submerged fermentation was carried out to improve the vitamin K_2yield of mutant FM5-632.The results indicate that an excellent mutant FM5-632 with a yield of 123.2±1.6 μg/L,that is four times that of the original strain,was achieved by eight successive implantations under the conditions of 15 keV and 60×2.6×l0~(13)ions/cm~2.A further optimization increased the yield of the mutant by 39.7%,i.e.172.1±1.2 μg/L which occurred in the mutant cultivated in the optimal fermentation culture medium composed of(per liter):15.31 g glycerol,10 g peptone,2.89 g yeast extract,5 g K2HPO_4,1 g NaCl,0.5 g MgSO_4·7H_2O and 0.04 g cedar wood oil,incubated at 33℃,pH 7.0 and 180 rpm for 120 h.     

新型防腐剂双乙酸钠的制备

采用三种方法制备了新型防腐剂双乙酸钠 ,并优选得到其最佳制备方法为碳酸钠醋酸法 ,该方法具有原料成本低、操作简单、易于工业化生产等优点     

大功率氮化镓基LED关键技术研究

对大功率氮化镓基LED的关键技术,尤其是大芯片LED的结构设计,p电极的选择与制备,提取效率的提高以及倒装焊技术做了重点的介绍与讨论.     

30000m~3/h空分设备增产改造的可行性分析

针对兖矿集团国宏化工有限责任公司一期50万t/a甲醇生产装置增产至60万t/a甲醇的计划,制定了配套空分设备增产改造的方案。介绍空分设备配套部机的主要参数,分析其运行现状和增产改造方案的可行性,为公司的增产改造做好准备。     

High transmittance and grain-orientated alumina ceramics fabricated by adding fine template particles

Transparent Al₂O₃ ceramics with grains aligned to the c-axis were prepared by adding platelets with a low aspect ratio into fine equiaxed particles.The mixed powders were formed into green bodies using spontaneous coagulation casting and sintered by pressureless sintering and hot-isostatic pressure sintering.Zeta potentials and rheological behavior of the slurries,relative densities of green bodies,and orientation and optical properties of sintered bodies were investigated and discussed.The platelet with a high aspect ratio suppressed densification more seriously during sintering than the one with a low aspect ratio.An excellent oriented structure was obtained when 5 wt%platelets with a low aspect ratio were added,and transparent Al₂O₃ ceramics with grains aligned to c-axis were successfully prepared;the in-line transmittance was 78.4%at 600 nm,which is the highest one in the currently reported literature.