豆豉溶栓酶提取纯化研究

对豆豉溶栓酶发酵液进行提取、脱色,盐析,超滤脱盐,冷冻干燥等纯化研究,制得的豆豉溶栓酶干品,其比活力为530.6U/mg,纯化倍数为11.0,活性回收率为65.7%。溶栓酶干品经Sephadex G-100柱层析,SDS-PAGE法测定分子量为31.0ku。     

TiAl基金属间化合物研究进展

与普通超合金相比，TiAl基金属间化合物以其优异的性能在航空和汽车工业中应用越来越广泛，本文总结了TiAl基合金在微观结构控制、微观组织对性能影响、合金化、熔炼技术、加工技术以及应用等方面的研究进展。     

贵州省剑河温泉水化学特征及形成机制浅析

以贵州省变质岩区典型的剑河温泉为研究对象,从温泉所在区域地质、地热地质背景入手,分析了剑河温泉的水文地球化学和氢氧同位素特征,结果表明:温泉具有断裂(裂隙)型温泉特征,温泉的不具岩浆热源,主要是靠正常的区域大地热流量来提供热和维持,补给来源为大气降水,剑补给区的高程在1050~1150m之间,热储温度约为68.3℃,地热水循环深度约2890m。温泉的形成主要受岩性及区域性断裂控制,大气降水通过断裂破碎带向下入渗、运移,并不断被加热,至革东断层后上升,在地势低洼处出露形成温泉。     

发展畜牧循环经济 加快农业方式转变

本文分析了畜牧业循环经济的基本内涵,诠释了破解城乡二元结构所面临的巨大压力,剖析了畜牧业循环经济与新农村建设的关系,提出了促进农业增长方式转变的思路和建议。     

元素粉末锻造法制备Ti-43Al-5V-4Nb合金的组织与性能

以Ti、Al等元素粉末为原料,采用快速烧结方法和无包套锻造法制备尺寸为Ф50×10 mm的TiAl合金锻坯.快速烧结后,TiAl合金由TiAl、Ti3Al、B2、Ti和TiAl3相组成,并且该合金存在较多的孔隙,孔隙主要由偏扩散造成的;经过高温锻造后,其孔隙得到了有效的控制,相对密度达到93%;经过热处理后,该合金主要由TiAl和Ti3Al相组成,在室温下合金的屈服强度提高了110 MPa,达到480 MPa,室温延伸率到达0.83%;在700℃和750℃,其屈服强度分别为580 MPa和530 MPa,其延伸率分别为12%和27%.     

Influence of yttrium on microstructure and properties of Ti-23Al-25Nb alloy after heat treatment

The existence of yttrium in Ti-23Al-25Nb alloy and its influence on the microstructure after heat treatment of Ti-23Al-25Nb alloy were investigated using thermal analysis（DTA）, EPMA, XRD and SEM. The heat treatment was determined based on DTA measurements. The compression tests at room temperature were performed on a Instron-569 universal tester. The results show that yttrium exists as the Y2O3 alloy. The addition of Y doesn＇t affect the characteristic phase transformation temperature At lower quenching temperature, Y strengthens the XRD peaks of O phase by improving the decomposition of B2 phase. Yttrium addition enhances the compression properties with the compression strength, yield strength and compression ratio increasing. The strengthening is attributed to the second phase strengthening of Y2O3 particles and the grain refinement.     

Microstructures and properties of titanium alloys Ti-Mo for dental use

The microstructures and properties of a series of binary Ti-Mo alloys with molybdenum contents ranging from 5% to 20%（mass fraction） were investigated. The experimental results indicate that the crystal structure and morphology of the cast alloys are sensitive to their molybdenum contents. When the Mo content is 5%, the equiaxed a crystal grain is observed. When the Mo content is 10%, the equiaxed a crystal grain and fine needles β phase are observed. When the Mo contents are 15% and 20%, only the equiaxed β crystal grain is observed. When the Mo content is 10%, the synthetical properties of the Ti-Mo alloy are the best. The data of hardness （HV451）, compression strength （1636 MPa）, compression ratio （22.5%） and elastic modulus （29.8 GPa） were collected. The increase of molybdenum contents is propitious to crystal refinement and improvement of plasticity of Ti-Mo alloys. The dry wear resistance of Ti-Mo alloys against Gr 15 ball was investigated on CJS 111A ball-disk wear instrument. The results show that the dry wear resistance of Ti-Mo alloys is correlative with hardness and mechanical properties. With the ductility increasing, the dry wear resistance reduces. The friction coefficient of 10%Mo alloy is the lowest, the dry wear resistance is the best. The wear particles, wear scar depth and width of the 10%Mo alloy are smaller than that of other Ti-Mo alloys. Considering all kinds of properties of Ti-Mo alloys, 10%Mo alloy is prospective dental prostheses material.     

三网融合中一体化身份认证机制研究

文章分析了三网融合环境下对身份认证机制的安全需求,利用自证明公钥原理提出了一种适用于融合网络的身份认证机制。该机制充分吸收了椭圆曲线和对称密钥身份认证体制的优点,在保证安全性的前提下有效削减了网络资源开销,提高了身份认证在融合网络中的适用性。     

水基油溶性堵剂室内研究

为了促进选择性堵水剂的研究应用,采用沥青,油溶树脂和适当的改性剂制备了水基油溶性堵剂并对其性能进行了实验对比考察,岩心实验结果表明,水基油溶性堵剂的堵水性能优于活性稠油,更优于水基冻胶堵剂,软化点接近于或低于岩心（地层）温度的堵剂,颗粒平均直径可以大于岩心孔孙平均直径,而软化点比岩心（地层）温度高20度以上时,直径比岩心孔隙直径小的颗粒才能进入岩心孔隙发挥封堵作用,沥青和石油树脂的软化点可由于加入不易软化的物质而升高,也可由于加入油类物质而降低。     

纳米晶Mg-Al水滑石的水热合成及晶粒度调控

以水不溶性的化合物为前驱物，水热法一步合成了纳米晶Mg-Al水滑石。用XRD、SEM和FT-IR对合成产物进行了表征。通过系统分析前驱物类型、反应温度、时间和碱度与水热反应产物物相组成和晶粒度的关系，提出了调控Mg-Al水滑石晶粒度的方法：升高温度、延长反应时间、适度提高碱度，均会使晶粒度均匀增大。其它条件相同时，前驱物间的竞争性水解能力是影响物相纯度和晶粒度的主要因素。