科技英、俄语虚拟语气的简要比较

本文就科技英语和科技俄语的虚拟语气进行了简要对比。     

一种基于空间域和频谱域特征的图象分割方法

提出了一种基于空间域和频谱域特征的神经网络的医学图像分割方法．本方法不需要教师监督,能自动生成最优的网络输出节点,即分类数．对ＣＴ,ＭＲＩ和超声图像的分割表明本方法有效方便．     

Syndrome series of one point algebraic-geometric codes and majority voting scheme

A type of recurring relations on syndrome series is presnted. After some important theorems are established, an algorithm for computing a minimal polynomial set is presented. Finally an algorithm for determining the unknown syndromes with incorporating α majority scheme is presented.     

小毛足鼠(Phodopus roborovskii)食性和食量的研究

小毛足鼠饲喂试验结果以及颊囊食物统计结果表明,该鼠在饲喂条件下食物资源利用谱相对较宽,但在野外条件下食物资源的利用主要以植物种子为主;并结合具体情况探讨了造成野外条件下该鼠食物资源利用范围趋于特化的原因．估算了小毛足鼠的采食效率为０．０７６％～０．１４％．在以上研究基础上,对小毛足鼠的危害与防治问题作了初步分析与说明     

求解常微分方程的一类线性多步方法

本文给出常微分方程y′=f(t,y)及″=f(t,y)的一类线性多步方法,它们的系数容易在计算机上生成。     

Diagnosis of prostate cancer by quantitative analysis of 3DMRSI data: A new model

Three-dimensional magnetic resonance spectroscopic imaging (3DMRSI) is helpful to identify prostate cancer (PC)from benign prostate hyperplasia (BPH) and to show the distribution of tumor infiltration. Combined with the (Cho + Cre)/Cit ratio, the z-score model can effectively discriminate prostate cancer from stromal benign prostate hyperplasia (sBPH) and detect small malignant lesions (SML).     

半模范畴中Hom的左正合性

利用半模的差模定义了半模同态序列的正合，讨论了Hom函子的左正合性。     

时域多分辨率法分析二维光子带隙结构的色散特性

采用时域多分辨率法分析计算了在TM波情形下二维介质光子带隙结构的色散曲线．分别在介质柱的相对介电常数εr＝10．2，20．2的算例中选取较粗网格(约为细网格的3倍)，其计算结果在精度上与采用细网格的时域有限差分法相同，但均明显地节省了计算内存和时间。     

Design and application of 60mer oligonucleotide microarray in SARS coronavirus detection

In April 2003, a novel coronavirus[1,2] which was associated with cases of Severe Acute Respiratory Syn-drome (SARS) was first isolated and sequenced in Canada. The genome of SARS coronavirus (SARS-CoV) is 29727[3] nucleotides in length and has 11 known open reading frames (ORFs). Although the genome organiza-tion of this virus is similar to that of other coronaviruses, phylogenetic analyses and sequence alignment show that SARS-CoV is not closely related to any of the previously ch…     

Temperature variations on the Tibetan Plateau over the last two millennia

The paleoclimate data recovered from ice cores,tree rings and lake sediments indicate regional features of cfimatic change on the Tibeta n Plateau (TP) during the last 2000 years. The composite temperature reconstructions in-dicate that several main climatic episodes, such as the “LittleIce Age“ between 1400 and 1900, the “Medieval Warm Pe-riod“ in 1150-1400, a less warm period in 800-1100, and an earlier cold period between the 3rd and 5th centuries,occurred in the TP. In addition, temperature varied from region to region. The period from AD 800 to 1100, which waswarm in northeastern TP, was contemporaneous with cool-ing in the western and southern TP. The southern TP ex-perienced warming between 1150 and 1400. For western TP,the δ^18O records of the Guliya ice core indicate that the pe-Hod 1250-1500 witnessed a clear warming. Large-scaletrends in the temperature history from northeastern TP aremore similar to those in eastern China than are the trendsfrom the Guliya ice cap far to the west and southern TP. The most prominent similarities between the temperature varia-tions of the TP and eastern China are such cold phases as 1100-1150, 1500-1550, 1650-1700 and 1800-1850, andthe latter three cold events match with three widespreadg lacial advances which occurred on the TP during the Little Ice A2e.