热分析动力学参数的统计分析

介绍了热分析动力学中"三因子"-活化能E、f(a)和指前因子A的求算,并随机对408种化合物的热分析动力学参数活化能E的分布特性作了统计研究,得出了活化能E的常见范围为50～350 kJ*mol-1.     

釜式反应器停留时间分布的测定及其与反应转化率的关系

采用脉冲法测定了蔗糖水解反应在连续搅拌釜式反应器内的停留时间分布,求得了停留时间分布密度函数E(t)、平均停留时间以及模型参数。由E(t)直接计算出的反应转化率与实际测出的转化率相当吻合。这表明,通过停留时间分布密度函数E(t)直接求算反应转化率是可行的。     

DJS——21机编译系统——标准过程的扩充

一、DJS——21机标准过程的扩充目前,DJS-21计算机所采用的程序语言是ALGOL-60,并结合机器特点作了某些增删。ALGOL-60中建议了九个标准函数,包括ABS(E)求表达式E值的绝对值; SIGN(E)求表达式E值的符号; SQRT(E)求表达式E值的平方根(E~(1/E); SIN(E)求E值的正弦; COS(E)求E值的余弦; ARCTAN(E)求E值的反正切主值; LN(E)求E值的自然对数; EXP(E)求E值的指数函数; ENTIER(E)求不大于E值的最大整数;而且这些标准函数的名字(函数符)是保留字,不作别用。DJS-21机算法语言则     

常用概率分布的数字特征与级数的和

应用几何分布、Poisson分布、Pascal分布的期望与方差来求一类级数的和.     

均布载荷作用下胶接悬臂梁的静态响应分析

利用材料力学假设方法研究了胶接悬臂梁在均布载荷作用下的变形计算和胶层内剪切应力的分布问题,并利用算例说明了梁的变形和胶接层内剪切应力随不同E2/E1时的变化情况.算例结果表明,胶接梁挠度变化曲线和胶层内剪切应力分布曲线都随着E2/E1的增大呈下降趋势,且胶层内剪切应力峰值靠近固定端一侧.     

微分方程f″+A(z)f=0的解的零点充满圆

设f1和f2是复方程f″+A(z)f=0的2个线性无关解,其中A(z)是一个整函数,记E=f1f2.利用无穷增长级函数的型函数,对E的零点分布进行了研究,得到了λ(E)=∞的情况下E的零点充满圆序列的一些结果.     

曲线拟合法求参数及韦布尔分布的任意点计算公式

本文简述了曲线拟合法求参数的原理,对曲线拟合法的权,不同的目标函数,评差及歪曲,能否消除系统误差,参数个数与拟合精度的关系等问题进行了讨论,并编制了从倾斜求韦布尔分布,从下沉求韦布尔分布,及从水平移动求概率积分法参数的程序,文章为了使韦布尔分布计算能用于实际,编制了任意点的移动和变形的程序,并提出了叠加方法。本文对推广曲线拟合法求参数及韦布尔分布的应用有一定的理论参考价值。     

求二分图所有最小复盖的交的好算法以及由此求所有最小复盖的算法

本文给出了一个求二分图G所有最小复盖的交的好算法,其时间复杂性为O(max{|V(G))|~(1/2)。|E(G)|,|V(G)|~2})。并且在上述基础上再给出求所有最小复盖的算法,其时间复杂性为O(max{|V(G)|~(1/2)·|E(G)|,|V(G)|~2,|C|·|V(G)|})。其中V(G),E(G)分别是G的顶点集,边集,C是G的最小复盖组成的集     

求二分图所有最小复盖的交的好算法以及由此求所有最小复盖的算法

本文给出了一个求二分图G所有最小复盖的交的好算法,其时间复杂性为O(max{|V(G)|~(1/2)。|E(G)|,|V(G)|~2})。并且在上述基础上再给出求所有最小复盖的算法,其时间复杂性为O(max{|V(G)|~(1/2)·|E(G)|,|V(G)|~2,|C|·|V(G)|})。其中V(G),E(G)分别是G的顶点集,边集,C是G的最小复盖组成的集     

Fabry缺项齐次线性微分方程解的零点充满圆

设f1,f2,…,fn是Fabry缺项整函数系数微分方程的n个线性无关解,E为这些解的乘积.本文研究E的零点分布,建立E的零点充满圆和Borel充满圆的一个结果.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

Quantitative trait loci （QTLs） for quality traits related to protein and starch in wheat

Quality traits in wheat （Triticum aestirum L.） were studied by quantitative trait locus （QTL） analysis in a recombinant inbred line （RIL） population, a set of 131 lines derived from Chuan 35050 × Shannong 483 cross （ChSh）. Grains from RILs were assayed for 21 quality traits related to protein and starch. A total of 35 putative QTLs for 19 traits with a single QTL explaining 7.99-40.52% of phenotypic variations were detected on 10 chromosomes, 1D, 2A, 2D, 3B, 3D, 5A, 6A, 6B, 6D, and 7B. The additive effects of 30 QTLs were positive, contributed by Chuan 35050, the remaining 5 QTLs were negative with the additive effect contributed by Shannong 483. For protein traits, 15 QTLs were obtained and most of them were located on chromosomes 1 D, 3B and 6D, while 20 QTLs for starch traits were detected and most of them were located on chromosomes 3D, 6B and 7B. Only 7 QTLs for protein and starch traits were co-located in three regions on chromosomes 1D, 2A and 2D. These protein and starch trait QTLs showed a distinct distribution pattern in certain regions and chromosomes. Twenty-two QTLs were clustered in 6 regions of 5 chromosomes. Two QTL clusters for protein traits were located on chromosomes 1D and 3B, respectively, three clusters for starch traits on chromosomes 3D, 6B and 7B, and one cluster including protein and starch traits on chromosome 1D.