Research on TiO 2 Tiny Powders by Freeze drying

In this paper,the recent advance of the study on the method of freeze drying to produce tiny powders abroad is introduced.Meanwhile,the features of the study are reviewed.We try to produce TiO 2 tiny powder by this method,and try to find the optimal technology parameters(cooling rate,cooling medium),and produce some nanometer materials.     

Research of Al2O3 influences on the abrasion resistance of E-coatings on magnesium alloy

The cathodic electrodeposition coatings(E-coatings) with silane modifying ceramics are prepared on magnesium alloy for improving the abrasion resistance of organic E-coating. Hardness, adhesion, corrosion resistance, circle-drawing method and abrasion resistance are evaluated by pencil hardness, UMT abrasion test system, and Machu test. The results show that the abrasion resistance and hardness of E-coatings are enhanced by adding Al2O3 ceramic powders. Meanwhile, corrosion resistance and adhesion of E-coatings remain unchanged.     

THE DEVELOPMENT OF ALUMINIUM MATRIX MICRO -GLASSBALL COMPOSITE AND THE ANALYSIS ON ITS FORMING MECHANISMS

The problem that the micro-glassball is not wettable in molten aluminium alloys can be solved by a special technology that is different from rheocasting and squeezecasting methods. The metten metal can fill the cavity of the glass ball through the broken place on its wall, and an original micro -structure will be formed. This material has good comprehensive mechanical proper ties and this method can be used to other kinds of ceramic powders. The mechanisms of the formation of this materials have been discussed as well.     

玉米裂纹及其检测

我国粮食部门经过较长时间才认识到玉米裂纹的重要性。玉米裂纹是指人眼能观察到的玉米表面和胚乳内部裂缝宽度为0.1 mm左右的缝隙。玉米籽粒内部生来就有许多微裂纹,构成胚乳内众多的微毛细管。借助电子显微镜可以观察到纳米级的微毛细管。目前检测玉米裂纹的仪器需进一步改进。     

土地利用方式对土壤团聚体及微团聚体的影响

在宁夏固原上黄试验区，对灌木林地、农地、天然草地、果园和人工草地5种土壤的团粒结构和微团聚体结构进行了分析，探讨了土地利用方式对土壤结构性质的影响。结果表明：土壤团聚体总量：天然草地>灌木林地>果园>农地>人工草地；对于不同的用地类型，灌木林地及天然草地有利于形成大粒径的团聚体颗粒，而农地、果园和人工草地形成的团聚体颗粒粒径较小。土壤微团聚体：灌木林地和草地土壤1~0.01mm微团聚体含量较高，果园偏低；灌木林地和草地对于土壤微结构的形成有促进作用；果园表层土壤的微结构水稳性最差，灌木林地和人工草地最好。     

Experiments on the Filtration Property of Two Kinds of Porous Ceramic Membrane Configurations

Tests are carried out on the filtration and organized forms of pure water flow and pond water flow using two kinds of flow channel porous ceramic membrane. Results show that for the two kinds of porous ceramic membranes, their removal efficiency of turbidity degree, chroma, CODMn and UV254 are nearly the same. The filtering quality of fan-channel porous ceramic membrane is better than that of circular-channel porous ceramic membrane, and the filtration flux of the former is 1.45 times the flux of the latter.     

胡萝卜超微粉制备技术的研究

对胡萝卜超微粉的制备技术进行了专门研究。在胡萝卜超微粉碎过程中,通过对原料水分含量、超微粉碎时的球料比、研磨时间及设备转速等影响因素的控制,进行单因素实验和正交实验,从而确定了最佳工艺参数,并确定最优水平组合为:转速240rmin,研磨时间为4h,水分含量为3%,球料比为6。     

鸡桑叶片光合速率与气孔导度及微气象因子的相关性研究

摘要：鸡桑(Morus australis Poir)叶片光合速率是桑的重要生理指标,本文旨在对影响鸡桑光合速率的生理因子------气孔导度和影响鸡桑光合速率的微气象因子进行分析,讨论其对鸡桑光合速率的影响;在鸡桑果实成熟期开展连续24h加密观测微气象因子,符合气象观测规范,采用LI6400型便携式光合测定仪,每个时次对相同的叶片进行活体测定。结果显示：鸡桑气孔导度与叶片光合速率及蒸腾速率呈正相关关系;鸡桑胞间CO2浓度与气孔导度呈负相关关系,CO2浓度在不同阶段对气孔导度的影响不同,浓度水平越高,影响越巨大;在影响鸡桑光合速率的微气象因子中,光照强度及叶温与鸡桑叶片光合速率在一定范围内呈正相关,光合速率随胞间CO2浓度的升高而降低。可见：鸡桑气孔导度与叶片光合速率、蒸腾速率及胞间CO2浓度关系密切,且与蒸腾速率的关系更显著;光照强度、CO2浓度及叶温等气象因子作为重要外界因素,其对鸡桑叶片光合速率的影响也是巨大的。     

Study on Development and Manufacturing Process of Ceramic Products Based on CE

Based on the Concurrent Engineering (CE) idea, we have established the development and manufacturing process model of the ceramic products and its supported environment, through studying the development and manufacturing of ceramic tableware in the ceramic industry. The key technology will be discussed in this paper. The achievements of researching, which has shortened product lead time and improved product quality, have been applied in ceramic enterprise.     

Design of Preparation of High Grade WC Powder from Voilet WO2.72

Synthesis of W powder by oxide reduction method and fabrication of WC powder by carbonization of W powder are investigated, using violet and blue tungsten oxides as the raw materials, respectively, for the preparation of excellent high grade WC powder. Microstructure and properties of the two raw materials and the obtained W powders and WC powders are studied. The results show that violet tungsten is a suitable raw material for synthesizing uhrafine W powder using the conventional method. The W and WC powders produced from the violet tungsten oxide have better physical properties than those produced from blue tungsten oxide.     

柠条在草食动物饲料中的利用

对柠条在草食动物饲料中的利用进行了研究。结果表明，柠条作为饲料，具有很高的应用价值。一方面，柠条可以替代当地传统的混合牧草饲喂羊、兔等。这可以通过三条途径来实现。首先，柠条嫩枝叶直接青饲；第二，柠条经揉碎后饲用；第三，柠条制成草粉作为青干草粗饲料。另一方面，柠条粉添加调味剂后作为饲料，既可改善饲料的营养价值，又能增强草食动物的适口性。其次，拧条粉添加到精料补充料中作为草食动物精料中糠麸类的替代品，大大降低了饲料的成本。总之，柠条作为草食动物饲料，价格低廉，具有广阔的推广应用前景。     

Dry mixed Superfine Sand Mortar for Bonding Ceramic Tile

By modification with water retentive agents and organic bonding admixtures, one dry mixed superfine sand mortar used as ceramic tile bonding was prepared with good workability, adhesive capacity and climate resistance. The test results indicate that this mortar has excellent anti sagging characteristics, with slippage of less than 2mm, sufficient open time and bonding strength over 1 MPa after being open for 20 minutes. These traits provide the needed qualities for thin construction of ceramic tile bonding. By adding polypropylene fiber, a flexible mortar was prepared with superior crack resistance for use as a ceramic tile bonding agent. The preparation mechanism, method and performance are introduced in detail.     

跳虫在茶园生态系统中的生态作用

跳虫是茶园土壤生态系统中分布极广的一类小型至微型节肢动物。它们在茶园土壤中与其它土壤动物对土壤物质循环、结构、理化性质、能流、降解化肥与农药和生物群落的维护等发挥十分重要作用。土壤跳虫的多样性以及群落结构、物种构成都反映了土壤质量和受污染状况。     

中草药粉剂及其复配剂对玉米象和赤拟谷盗成虫的防治作用

采用药膜法、拌粮法研究了高良姜、艾叶、臭椿树皮、蛇床子、香茹草、雷公藤6种中草药植物粉剂单独或其复配剂对玉米象和赤拟谷盗成虫的防治作用.结果表明:6种中草药植物粉剂对玉米象成虫均具有一定的防治作用,其中蛇床子粉剂、高良姜粉剂、臭椿树皮粉剂、香茹草粉剂的效果较好,但对赤拟谷盗成虫几乎没有防治作用.采用药膜法比拌粮法对玉米象成虫的防治效果显著增强.6种中草药植物粉剂及其复配剂对玉米象成虫均有一定的驱避作用和较强的毒杀作用.凯安保对玉米象成虫具有较强的诱杀作用,但6种中草药植物粉剂与凯安保的复配剂却没有明显的诱杀作用,与植物粉剂单独使用相比没有显著差异.     

Rubber Powder Modified Frost Resistance of Recycled Aggregate Concrete

Utilizing relative dynamic elastic modulus and weight loss of concrete as evaluation indices, the frost resistance of concrete with 0.45 water-cement ratio and different recycled aggregate replacement proportions was studied in the water and 3.5% sodium chloride solution. The mass proportions of recycled aggregate are 25%, 50% and 75%, respectively. Furthermore, the frost resistance of the modified concrete with 5% and 10% rubber powder volume fractions replacing fine aggregates was studied. The results show that: the frost resistance of concrete decreases with the increase of recycled aggregate, when the recycled aggregate mass fractions are 25% and 50%, its influence on the frost resistance of concrete is little, and mixing rubber powders can effectively improve the frost resistance of concrete; when the recycled aggregate mass fraction reaches 75%, its effect on the frost resistance of concrete is significant, and mixing rubber powders has certain improvement effect, but compared with the benchmark group of concrete the maximum freeze-thaw cycles decreases more than 30%. In water frozen test, the weight loss is small and the relative dynamic elastic modulus loss is quite obvious. The frost resistance is better when adding 5% volume fraction of rubber powders. In salt frozen test, the main characteristic is the weight loss exceeds the requirements. The frost resistance is better when adding 10% volume fraction of rubber powders. The improvement effect of rubber powder to the frost resistance of concrete in salt solution is much better than that in water.     

Present Status and Development of Synthesis Technologies for TiC,TiN,Ti(C, N) Powders

The preparation technologies of TiC?TiN?Ti(C, N) powders used home and abroad in recent years are reviewed, and the technical processes and characteristics are analysed. The existing problems and development trends of these technologies are also discussed. By seeking cheaper raw materials and achieving new high temperature technologies by plasma, microwave, laser, and electric arc and combining SHS and MA the low-cast and large-scale preparation of high quality TiC, TiN, Ti(C, N) powders are becoming one of the hot research topics. With the development of research and the improvement of preparation techniques, more convenient, more economic and more efficient preparation techniques will provide TiC, TiN, Ti(C,N) powder a broader prospective application.     

Quick Modifying Method of NURBS Curve

Although there are modifying modules in the most CAD software, the parameters of entire curve must be computed again as the tiny local curve changed. The modification are not local and spending long time and difficult as the eurve is complex or large. A method can be applied to engineering designer easily has been proposed. There are only four segments have been ehanged along with the moving of a given point, and the speed is fast. It ean be used to CAD software and generalize the method to surface easily.     

紫茎泽兰基芳香防蛀缓释剂的制备与性能研究

为了制备紫茎泽兰基芳香型防蛀缓释剂,通过可压性和开放式体外释放实验,确立了适宜在片剂中添加的吸附剂和赋形剂,并探讨了制剂组成和制备工艺条件对片剂释放性能的影响,通过药效试验测定片剂的药效。结果表明,微粉硅胶具有较好的可压性及控释作用,适宜添加在片剂中;以紫茎泽兰草粉为载体,在10 MPa压力下可成功制备外形完好的紫茎泽兰基芳香防蛀缓释片剂,片剂中紫茎泽兰草粉用量可高达片剂质量的76% (m/m),且香味持留时间可达3个月以上;薰衣草香精的加入不仅能掩盖草粉的不愉悦气味,还能提高片剂的药效。本研究中芳香防蛀缓释剂的成功制备,不仅拓宽了紫茎泽兰的综合利用范围,也为国内防蛀剂市场提供了一个具有增香的多功能防蛀缓释剂。     

两个水稻生殖器官突变体的形态特征和遗传分析

我们在转基因水稻后代中发现了两个生殖器官发育相关的隐性突变体,暂命名为function of reproductive organ J(from)和pistilloid-stamen(ps-2).frol突变体内外稃闭合,抽穗但不开花;4轮器官结构及数目近正常,但内外稃片抱合扭曲成辣椒状,雌雄蕊发育不完全,无花粉形成,雌蕊不育.ps-2突变体类似Luo等(2006)报道的ps突变体:颖花开裂,内外颖片变窄、变硬,外颖弯曲,但ps只有1～5枚雄蕊转化成雌蕊,而ps-2有5～6枚雄蕊转化成雌蕊,仅有极少数突变颖花留有1枚未转变的雄蕊,突变体雌蕊状结构10个以上,不能结实.通过对突变体frol和ps-2分别与野生型明恢86正反杂交,与R527、93-11和中花16的杂交后代表型分离规律分析表明:突变体frol和ps-2是分别由一对隐性基因控制的突变体,其中frol的F2后代表型分离比均符合3:1,大部分ps-2的F2后代表型分离比偏离3:1.进一步分析frol和ps-2双突变体的遗传和表型发现:frol和ps-2基因不等位,是两个独立遗传的基因.植株生活力受纯合ps-2基因的影响,但不受纯合frol基因的影响.双突变体的内外稃片结构及开裂特征似ps-2,而内外稃包合状与frol近似,雄蕊仍表现雌化,但数目明显减少.frol和ps-2双突变体的表型特征暗示了ps-2和frol间存在一定的互作.     

The Rapid Synthesis ofLong_Persistence Phosphors by Combustion

The authors have fabricated long persistence phosphors rapidly by combustion method at a comparatively lower temperature range.This process goes quickly and the loose resultants with small hardness and tiny particles have been obtained,which is important for the phosphor's utilization.