80m高钢筋砼烟囱的爆破拆除

论述了控制爆破拆除钢筋砼烟囱的方案设计与力学计算、爆破参数确定、施工方法、安全防护措施、震动监测和爆破效果.     

Stereoselective asymmertric synthesis and characterization of 17α-acetoxy-19-nor-progesterone

17α-actoxy-19-nor-progesterone was synthesized by a new efficient stereoselective asymmertric pathway from 19-nor-androst-4-en-3,17-dione in 5-steps reactions with overall yield 63.3%. Consequently, a strategy was used to produce of 17-α-hydroxyl compound stereoselectively by addition 17-keto steroid with hydrogen cyanide, at the same time, the conditions of this asymmertric reaction were optimized. The titled compound and the intermediate were fully characterized by 1H, one dimension and two dimension 13C-nuclear magnetic resonance, and infrared spectrum. The results show that the rate of 17-α-hydroxyl compound isomeride is sensitively affected by the solution system and the best volume ratio of CH3 OH to H2 O is 36%. After the carbonyl and hydroxyl groups were protected by ethylenediol and vinyl butyl ether respectively, organometallic addition to CN group with CH3 Li, androstance compound was converted to pregnane compound. After removing the protective groups by a mild hydrolytic procedure with high yield, the titled compound was obtained by esterified the above intermidiate. The new pathway gives a good purity of 98% as determined by high performance liquid chromatography.     

桑植旅游资源的空间整合开发研究

旅游资源开发必须置身于周围相关区域内,综合考虑各种情形,整合资源、市场、基础设施等,才能提高整体实力,获得成本优势,保证稳定的客流量,增强风险抵抗能力,实现全局共赢。桑植旅游资泺开发要突出其红色旅游资源特色,根据旅游资源的互补性,进行有效的地区整合。     

铜一钛爆炸焊接工艺试验研究

对铜一钛爆炸焊接工艺及参数进行了试验，测定了复合板的剪切强度，并通过金相分析。在现场进行了半年试验，证明焊接质量是可以满足生产要求的。     

小龙潭布沼坝西北边坡的数值模拟研究

为了研究露天矿边坡岩体的变形和破坏特征,论文应用弹塑性三维有限单元数值分析方法,分析计算了各种模拟方案的应力、位移及安全率的变化规律,对小龙潭布沼坝露天矿西北边坡岩体应力场的特征和破坏规律进行研究,为此类矿山边坡稳定性分析评价提供科学依据.     

基于网络平台的跨高校研究生创新教育管理

针对网络本身的平等性、开放性特点,通过建设跨高校的区域性研究生创新教育网络平台,解决研究生创新教育存在着发展不平衡以及各研究生培养单位条块分割、信息难以交流和共享等问题。从技术实现的层面上分析如何进行系统设计及其基本思路,包括系统设计原则与目标、系统构架与功能,最后提出了在系统实施过程中的运行保证措施,以保障实现该平台的建设目标。     

New technique of comprehensive utilization of spent Al2O3 -based catalyst

A new technology was developed to recover multiple valuable elements from the spent Al2O3-based catalyst by X-ray phase analysis and exploratory experiments. The experimental results show that in the condition of roasting temperature of 750 ℃ and roasting time of 30 min, molar ratio of Na2O to Al2O3 of 1.2, the leaching rates of alumina, vanadium and molybdenum in the spent catalyst are 97.2%, 95.8% and 98.9%, respectively. Vanadium and molybdenum in sodium aluminate solution can be recovered by precipitators A and B, and the precipitation rates of vanadium and molybdenum are 94. 8% and 92. 6%. Al（OH）3 was prepared from sodium aluminate solution in the carbonation decomposition process, and the purity of Al2O3 is 99. 9% after calcination, the recovery of alumina reaches 90. 6% in the whole process; the Ni-Co concentrate was leached by sulfuric acid, a nickel recovery of 98. 2% and cobalt recovery over 98.5% can be obtained under the experimental condition of 30% H2SO4, 80 ℃, reaction time 4 h, mass ratio of liquid to solid 8, stirring rate 800 r/min.     

评会计委派制—兼论我国会计人员管理体制改革的价值取向

“会计委派制”巳成为我国会计人员管理体制的主流观点,并在全国范围推广。认为字一管理模式从理论到实践均存在不足,并提出了建立“立法主导型”会计人员管理体制。     

上市公司信息披露的问题与对策

上市公司信息披露的对象包括股东、公司的各种债权人、政府有关部门及公司的潜在投资者,他们对公司的信息提出了较高要求。而近年来,上市公司在信息披露中存在不少问题,引起人们广泛关注。就上市公司的信息披露问题进行了归纳、分析,并提出解决问题的相应对策     

形势研判：剧变中的纺机市场

当前,纺机市场需求出现了小批量、多品种、深加工的重要特征,并且需求方向也出现了重要变化。在民营企业已占行业主体地位的纺机业,如何应对这一变动已成为企业未来制胜的关键。