Equivalent Time-Domain Representation and Uplink Channel Estimator for Multicarrier CDMA Systems

Many blind channel estimation methods have been proposed for direct sequence (DS) code-division multiple access (CDMA) systems, so we can certainly use them to estimate the finite impulse response (FIR) channel for the multi-carrier (MC-) CDMA system. In this paper, the MC-CDMA system is interpreted as an equivalent time-domain DS-CD-MA system with specific spreading codes. Then, an equivalently time-domain blind channel estimator is derived for the     

固—液手性相转移催化烷基化——Ⅰ合成(-)—2—甲酰乙氧基—2—壬烷基环戊酮

在相转移催化条件下,以己二酸为原料合成了(一) 2 甲酰乙氧基 2 壬烷基环戊酮。     

阳离子淀粉CST制备及脱色性能研究

研究了在基本干的反应条件下制备阳离子淀粉的方法及其脱色性能,确定了用氢氧化钠作催化剂时的最佳反应条件。     

不同品系黑腹果蝇细胞系的建立(Ⅰ)——影响细胞系建立的某些因素

果蝇细胞作为真核细胞基因表达的载体和受体系统是生物工程的一个重要研究内容。为着这一目的,我们对不同品系的黑腹果蝇(D.melanogaster)细胞进行了广泛的细胞培养试验。结果表明:繁殖世代在3～40代之内,发育6±2h的果绳胚胎是建立细胞系的最好材料。     

《数书九章》与农学

该文从农学史的角度，探讨宋秦九韶《数书九章》中天时、田域等章及其有关问题与农业的关系，指出它们在农学思想及土地利用上的意义和价值，并论及历法与农业的关系，文中还对第九章市物类“菽粟互易”一题中题到的“油麻”一物进行了考证，指出油麻即芝麻。     

Monotone additive Schwarz algorithms for solving two-side obstacle problems

Additive Schwarz algorithms for solving the discrete problems of two-side obstacle problems are proposed. The monotone convergence of the algorithms is established for M-matrix and the h-independent convergence rate is proved for S-matrix. The so-called finite step convergence for coincident components is discussed for nondegenerate discreted problems.     

泥浆工程设计专家系统开发与应用

论述了泥浆设计专家系统的研制目标，关键技术以及该系统开发策略、总体方案和技术措施。对所形成系统的特点和初步应用效果作了简析。     

Parallel region-preserving multisection method for solving generalized eigenproblem

The parallel multisection method for solving algebraic eigenproblem has been presented in recent years with the developing of the parallel computers but all the research work is limited in standard eigenproblem of symmetric tridiagonal matrix. The multisection method for solving generalized eigenproblem applied significantly in many secience and engineering domains has not been studied. The parallel region-preserving multisection method (PRM for shotr) for solving generalized eigenproblem of large sparse real symmetric matrix is presented in this paper. This method not only retains the advantages of the conventional determinant search method (DS for short), but also overcomes its disadvantages such as leaking roots and disconvergence. We tested the method on the YH-1 vector computer, and compared with the parallel region-preserving determinant search method (parallel region-preserving bisection method) (PRB for short). The numerical results show that PRM has a higher speed-up, for instance it attains the speed-up of 7.7 when the scale of the problem is 2114 and the eigenpair found is 3; and PRM is superior to PRB when scale of the problem is large.     

汽－液相变中成核的热力学理论

对现有汽－液相变过程有关文献中关于汽泡形成过程的分析提出了不同看法，并利用热力学理论从亚稳平衡态的特性出发对汽泡形成的热力学机制作出了分析，对系统从液态转变到汽－液共存状态的各阶段作出了说明。     

函数连分式的一个收敛定理及其应用

本文指出邹海著的《最优设计中的新计算法》中判定函数连分式收敛性的定理九是不正确的。建立了一个有别于前者的判别法,并由此重新给出三种最优设计的新计算方法。