短期利率期货的定价与价差分析

讨论了短期利率期货的套利定价与基差的基本原理,比较分析了期货价格与ＦＲＡ（远期利率协议）的行为,探讨了价差头寸问题。     

论公司债券的溢价与折价

发行债券会出现溢价或折价，溢价或折价取决于市场利率与票面利率的不等．溢价或折价的大小可根据公式：△＝Ｃ（ｒ－Ｒ）（１＋Ｒ）ｎ－１Ｒ（１＋Ｒ）ｎ溢价Ｃ（Ｒ－ｒ）（１＋Ｒ）ｎ－１Ｒ（１＋Ｒ）ｎ折价得出，且溢价不是给企业带来的收益，折价也不是给企业带来的损失     

水稻花发育相关MADS-box基因的克隆

以水稻幼穗总ＲＮＡ为模板,利用３′－ＲＡＣＥ克隆了８个接近于全长的水稻ＭＡＤＳ－ｂｏｘ 基因的ｃＤＮＡ．在ＧｅｎＢａｎｋ 的数据库中查询表明,其中２个ＦＤＲＭＡＤＳ１,ＦＤＲＭＡＤＳ２分别与已报道的水稻ＭＡＤＳ－ｂｏｘ 基因Ｏｓ－ＭＡＤＳ５和ＯｓＭＡＤＳ４５有极高的同源性,另外６个为新的尚未见报道的水稻ＭＡＤＳ－ｂｏｘ 基因．系统进化树分析表明ＦＤＲＭＡＤＳ１,ＦＤＲＭＡＤＳ２和ＦＤＲＭＡＤＳ４可能与Ｃ组基因的功能相关;ＦＤＲＭＡＤＳ３,ＦＤＲＭＡＤＳ６和ＦＤＲ－ＭＡＤＳ７可能与Ａ 组基因的功能相关     

FR^A—模型成的格

研究了全体ＦＲ＾Ａ－模型成的格ＦＲ＾Ａ（Ｍ）及其子格的结构，证得ＦＲ＾Ａ（Ｍ）及其子格为模格。利用同态理论研究同态模间形成的ＦＲ＾Ａ－模格的相互关系，得到一些重要的同态与同构定理。最后指出ＦＲ＾Ａ（Ｍ）不是配格。     

FRACTAL及其在计算机图形学中的应用

本文介绍一种崭新的理论和方法－ＦＲＡＣＴＡＬ，它的创立、理论基础和研究领域，给出了ＦＲＡＣＴＡＬ在计算机图形学中应用的几个方面，其中引用若干国外新近发表的例子，文中的是及ＦＲＡＣＴＡＬ应用于图形学的新设想，对进一步探索了ＦＲＡＴＣＡ因计算机图形学中的应用有一定的指导意义。     

Clifford分析中一类二阶偏微分方程的Dirichlet问题(英文)

ＯＮＤＩＲＩＣＨＬＥＴＰＲＯＢＬＥＭＦＯＲＡＣＬＡＳＳＯＦＳＥＣＯＮＤＯＲＤＥＲＰＡＲＴＩＡＬＤＩＦＦＥＲＥＮＴＩＡＬＥＱＵＡＴＩＯＮＩＮＴＨＥＣＬＩＦＦＯＲＤＡＮＡＬＹＳＩＳ＊ＬｉＳｈｅｎｇｘｕｎＱｉｕＪｉｑｉｎｇＤｅｐａｒｔｍｅｎｔｏｆＦｕｎｄａ...     

PLC控制双效溴化锂吸收式制冷装置能量自动调节

ＰＬＣ控制双效溴化锂吸收式制冷装置能量自动调节ＯＮＥＮＥＲＧＹＡＵＴＯＭＡＴＩＣＲＥＧＵＬＡＴＩＯＮＯＦＤＯＵＢＬＥ－ＥＦＦＥＣＴＬＩＴＨＩＵＭＢＲＯＭＩＤＥＲＥＦＲＩＧＥＲＡＴＩＮＧＭＡＣＨＩＮＥＢＹＭＥＡＮＳＯＦＰＲＯＧＲＡＭＭＡＢＬＥＬＯＧＩＣ...     

关于平坦性和内射性的一个注记

设Ｒ→Ａ是环同态，本文得到如下如果：①基Ｒ是交换环，Ａ是右Ａ－模范畴的上生成子，则Ａ为平坦Ｒ－模的充要条件是Ａ为ＦＰ－内射Ｒ－模；②若Ｒ是右凝聚环Ａ是ＦＰ－内射环，则Ａ为平坦左Ｒ－模的充要条件是Ａ为ＦＰ－内射右Ｒ－模。     

基于 PC ARC/INFO 实现立体模型的方法

】由于目前的ＰＣＡＲＣ／ＩＮＦＯ软件尚缺少ＴＩＮ（ＴｒｉａｎｇｕｌａｔｅｄＩｒｒｅｇｕｌａｒＮｅｔｗｏｒｋ）模块,要想用ＰＣＡＲＣ／ＩＮＦＯ建立体模型还不可能。该文介绍了以ＰＣＡＲＣ／ＩＮＦＯ的等高线图层（ｃｏｖｅｒａｇｅ）及属性为原始数据,并利用相关软件在ＰＣＡＲＣ／ＩＮＦＯ上建立体模型的一种方法。     

抗坏血酸对黄瓜种子荫发及组培苗生长的影响

抗坏血酸对黄瓜种子荫发及组培苗生长的影响孙艳，崔鸿文，尹明安，张恩让（西北农业大学园艺系，陕西杨陵，７１２１００）ＴＨＥＥＦＦＥＣＴＳＯＦＡＣＣＯＲＢＩＣＡＣＩＤＯＮＣＵＣＵＭＢＥＲＳＥＥＤＳＧＥＲＭＩＮＡＴＩＯＮＡＮＤＴＨＥＧＲＯＷＴＨＯＦＪＩＮ４...     

一种宽带光纤拉曼放大器数值模拟的新算法

以后向泵浦的宽带光纤拉曼放大器为模型,基于平均功率的思想,运用矩阵迭代法模拟信号光和泵浦光在光纤中的传输特性,数值计算出拉曼增益曲线.这种算法结合了平均功率法的快速和矩阵迭代法的简单易控制的优点,在保证计算精度的情况下能提高计算速度.理论分析结果和实验结果均显示该算法可以准确模拟拉曼放大过程.该算法可以为设计制作光纤拉曼放大器提供参考.     

同向抽运光纤拉曼放大器增益分析方法比较

系统地研究了同向抽运光纤拉曼放大器的增益特性,并对分析增益的数值模拟和求解析解2种方法进行了比较.采用龙格库塔法的算法对增益进行数值仿真,分析了所有参量在小信号和大信号时对增益的影响.将数值仿真结果与解析解进行比较,结果发现小信号时两者结果一致,且解析解的方法更简单;大信号时,数值模拟的方法更适合分析光纤拉曼放大器的性能.     

基于FRA的变压器绕组变形的分频段研究

变压器绕组在较高频率的电压作用下,每个绕组本身均可视为一个由线性电阻、电容、电感等分布参数构成的无源线性双口网络,通过对该双口网络的研究可以得到变压器绕组在各个频段的等效模型.频率响应分析(frequency response analysis,FRA)是变压器绕组分频段研究的主要方法.介绍了FRA的原理,分析绕组参数变化对不同频段频响曲线的影响,给出了变压器绕组在不同频段的具体等效模型.     

Cell-type-specific replication initiation programs set fragility of the FRA3B fragile site

Common fragile sites have long been identified by cytogeneticists as chromosomal regions prone to breakage upon replication stress. They are increasingly recognized to be preferential targets for oncogene-induced DNA damage in pre-neoplastic lesions and hotspots for chromosomal rearrangements in various cancers. Common fragile site instability was attributed to the fact that they contain sequences prone to form secondary structures that may impair replication fork movement, possibly leading to fork collapse resulting in DNA breaks. Here we show, in contrast to this view, that the fragility of FRA3B--the most active common fragile site in human lymphocytes--does not rely on fork slowing or stalling but on a paucity of initiation events. Indeed, in lymphoblastoid cells, but not in fibroblasts, initiation events are excluded from a FRA3B core extending approximately 700 kilobases, which forces forks coming from flanking regions to cover long distances in order to complete replication. We also show that origins of the flanking regions fire in mid-S phase, leaving the site incompletely replicated upon fork slowing. Notably, FRA3B instability is specific to cells showing this particular initiation pattern. The fact that both origin setting and replication timing are highly plastic in mammalian cells explains the tissue specificity of common fragile site instability we observed. Thus, we propose that common fragile sites correspond to the latest initiation-poor regions to complete replication in a given cell type. For historical reasons, common fragile sites have been essentially mapped in lymphocytes. Therefore, common fragile site contribution to chromosomal rearrangements in tumours should be reassessed after mapping fragile sites in the cell type from which each tumour originates.     

光通信中EDFA的工作原理和发展趋势

介绍掺铒光纤放大器(EDFA)的工作原理及应用,分析比较固定增益光放大器和自动增益调整光放大器的性能,展望掺铒光纤放大器与喇曼光纤放大器的联合使用。     

电液力伺服系统的实验建模与参数估计

基于递推最小二乘估计对Ｌｅｖｙ－Ｓａｎａ．辨识进行了改进，提高了建模的精度与速度；并结合Ｆ准则解决了系统阶次与时滞的确定；利用Ｓｏｌａｒｔｒｏｎ１２５０ＦＲＡ及其１０９６ＤＭＳ做为测试系统和软件开发工具，进一步增强了辨识程序包的实用性     

基于改进GMDH的科技成果中试转化系统模型构建

基于科技成果中试转化运行原理,搭建中试系统机理模型,利用改进GMDH构建相应数学模型。改进GMDH将含有回归项线性相关检测的快速递归算法（FRA）代替传统最小二乘（OLS）进行GMDH多层建模的部分多项式求解,使用初始变量添加法避免有效神经元过早丢失。以改进的GMDH对上海市中试转化统计数据进行建模及仿真实验,结果表明,所建模型比传统GMDH模型精度高,泛化能力强。     

基于频响分析法的脉冲电源与容性负载间匹配电路设计

为克服传统的基于负载匹配法设计的匹配电路存在导致容性负载上脉冲电压上升率明显降低的不足，提高脉冲电源在容性负载下的应用效果，提出了将频响分析用于设计脉冲电源与容性负载问匹配电路的方法．基于此法设计了一种由电感（Lm）支路和与其并联的阻-容（Rm-Cm）串联支路构成的匹配电路，当Lm、Rm和Cm满足使容性负载上的脉冲电压（u2）与脉冲电源输出的脉冲电压（u1）之比（u2/u1）的频响特性，在脉冲电源输出的脉冲电压的有效频谱范围内接近不失真系统频响特性的条件时，可在容性负载上得到既无振荡，且上升率高的脉冲电压．实验验证该匹配电路是有效的．     

The DNA sequence, annotation and analysis of human chromosome 3

After the completion of a draft human genome sequence, the International Human Genome Sequencing Consortium has proceeded to finish and annotate each of the 24 chromosomes comprising the human genome. Here we describe the sequencing and analysis of human chromosome 3, one of the largest human chromosomes. Chromosome 3 comprises just four contigs, one of which currently represents the longest unbroken stretch of finished DNA sequence known so far. The chromosome is remarkable in having the lowest rate of segmental duplication in the genome. It also includes a chemokine receptor gene cluster as well as numerous loci involved in multiple human cancers such as the gene encoding FHIT, which contains the most common constitutive fragile site in the genome, FRA3B. Using genomic sequence from chimpanzee and rhesus macaque, we were able to characterize the breakpoints defining a large pericentric inversion that occurred some time after the split of Homininae from Ponginae, and propose an evolutionary history of the inversion.     

Links between erosion, runoff variability and seismicity in the Taiwan orogen

The erosion of mountain belts controls their topographic and structural evolution and is the main source of sediment delivered to the oceans. Mountain erosion rates have been estimated from current relief and precipitation, but a more complete evaluation of the controls on erosion rates requires detailed measurements across a range of timescales. Here we report erosion rates in the Taiwan mountains estimated from modern river sediment loads, Holocene river incision and thermochronometry on a million-year scale. Estimated erosion rates within the actively deforming mountains are high (3-6 mm yr(-1)) on all timescales, but the pattern of erosion has changed over time in response to the migration of localized tectonic deformation. Modern, decadal-scale erosion rates correlate with historical seismicity and storm-driven runoff variability. The highest erosion rates are found where rapid deformation, high storm frequency and weak substrates coincide, despite low topographic relief.