铁含量对K418合金TCP相析出规律的热力学分析

利用Thermo-Calc软件热力学计算得出铁含量对K418合金的TCP相析出规律的影响。结果表明：K418合金析出相为MC相、M23C6相、γ相、γ′相、σ相、μ相、α-Cr相、M3B2相和液相。随着铁的质量分数从2.5%降至0%,碳化物、硼化物、液相线的含量变化较小,有少量α-Cr相析出。为减少K418合金TCP相析出,铁的质量分数建议控制在1.25%以下,无σ相析出且TCP相含量较少。实际生产中制定K418合金铁含量的目标值还需考虑设备状况和冶炼烧损量。     

hp-Adaptive spectral element solver for reactor modeling

The study, analysis and optimization of chemical reactors has shown a significant increase in complexity of the models used during the last decades. This complexity increased the computational cost of the models demanding the development of efficient solution techniques. This paper discusses the implementation of an hp-adaptive refinement technique applied to a least-squares spectral element formulation as a mathematical framework for reactor modeling. The refinement is based on an estimate of the local Sobolev regularity index of the underlying solution by monitoring the decay rate of its Legendre expansion coefficients. The performance of the method is demonstrated numerically by using an analytical test case.     

Chemical Interactions and Their Role in the Microphase Separation of Block Copolymer Thin Films

The thermodynamics of self-assembling systems are discussed in terms of the chemical interactions and the intermolecular forces between species. It is clear that there are both theoretical and practical limitations on the dimensions and the structural regularity of these systems. These considerations are made with reference to the microphase separation that occurs in block copolymer (BCP) systems. BCP systems self-assemble via a thermodynamic driven process where chemical dis-affinity between the blocks driving them part is balanced by a restorative force deriving from the chemical bond between the blocks. These systems are attracting much interest because of their possible role in nanoelectronic fabrication. This form of self-assembly can obtain highly regular nanopatterns in certain circumstances where the orientation and alignment of chemically distinct blocks can be guided through molecular interactions between the polymer and the surrounding interfaces. However, for this to be possible, great care must be taken to properly engineer the interactions between the surfaces and the polymer blocks. The optimum methods of structure directing are chemical pre-patterning (defining regions on the substrate of different chemistry) and graphoepitaxy (topographical alignment) but both centre on generating alignment through favourable chemical interactions. As in all self-assembling systems, the problems of defect formation must be considered and the origin of defects in these systems is explored. It is argued that in these nanostructures equilibrium defects are relatively few and largely originate from kinetic effects arising during film growth. Many defects also arise from the confinement of the systems when they are ‘directed’ by topography. The potential applications of these materials in electronics are discussed.     

正则的符号蕴含正交模式

一对符号模式行(或列)向量是蕴含正交的,若存在一对与它们有相同符号模式的正交实行(或列)向量.一个没有零行或零列的n阶符号模式矩阵是符号蕴含正交的,若每一对行和列向量都是蕴含正交的.本文证明了当n为偶数时,存在k正则n阶符号蕴含正交模式的充分必要条件是1≤k≤n;当n≠5为奇数时,存在k正则n阶符号蕴含正交模式的充分必要条件是1≤k≤n且k≠2;当n=5时,存在k正则n阶符号蕴含正交模式的充分必要条件是k≠2且k≠3.     

非定常Stokes问题解的存在唯一性的正则性

引入Ｆａｄｅｏ－Ｇａｌｅｒｋｉｎ方法解决了三维非定常半周期Ｓｔｏｋｅｓ问题解的存在唯一性问题，在加强了初始条件后，得到了解的正则性结果。     

四倍体甜菜种株生育规律的研究

将四倍体甜菜种株的一生划分为八个生育时期，全生育期需积温２２４３．３℃，种株生长呈Ｓ型曲线，现蕾期至盛花期是干物质生产速度和总量增加最快的时期，二、三级枝种子量占全株的８７．６％。     

豫西烟草脉斑病发生规律及药剂防治研究

连续 4年对烟草脉斑病 (马铃薯Y病毒的发生规律及 4种药剂的防效进行了研究。结果表明 :该病在豫西烟区的初发期为 6月上旬 ,6月下旬～ 7月上旬进入盛发期 ;发病与气候、移栽期、施肥、蚜虫等因素关系密切。 4种药剂防效中 ,“金叶宝”2 0 0倍液药剂防效较好 ,其防效率达到 71.4 7%。     

青海省然者涌－东莫扎抓成矿带成矿规律及远景分析

通过对然者涌－东莫扎抓区域构造背景的研究,分析了东莫扎抓、然者涌和阿夷则玛3个研究程度较高的矿床的矿体赋存规律,矿石结构构造和矿床成因类型。再结合资源形成地质背景和时空分布特征,划分出了拉美曲-阿夷能Cu、Pb、黄铁矿、石膏;巴纳赛-龙哇莫果Cu、Pb、Zn、Ag;东脚涌-俄弄 Cu、Pb、Zn、Au、Ag;阿阿牙赛-东莫扎抓Pb、Zn、Ag、Cu等4个成矿远景区。在该四个远景区内除了已发现的17处矿(床)点外,又新发现矿点8处,成因类型以热液型、沉积型矿(床)点为主,次为矽卡岩型和斑岩型。综合研究认为,然者涌－东莫扎抓地段具有较好的Cu、Pb、Zn多金属成矿和找矿前景。     

燕子山矿瓦斯含量分布规律和预测及应对建议

依据大同煤矿集团有限责任公司燕子山矿的实际特点,在搞清区域构造演化、矿区构造控制特征的基础上,结合大量瓦斯地质资料,对该矿井瓦斯地质规律进行了较为系统的研究,并对瓦斯含量分布规律、深部瓦斯、矿井瓦斯涌出量、煤与瓦斯区域突出危险性进行了预测,并提出了应对建议。     

重庆市荆襄式磷矿地质特征及成矿规律分析

重庆市荆襄式磷矿主要分布在渝东北的城口—巫山一带。评述了该类磷矿地层、构造、成矿特征等,总结了荆襄式磷矿成矿规律,为重庆市磷矿资源找矿及预测提供参考。