On the computation of conjugacy classes of Chevalley groups

In this paper an algorithm is presented to determine the number of semisimple conjugacy classes for a given centralizertype for the Chevalley groupsSL _n(q) andSU _n(q). Moreover we give the exact number of regular semisimple classes of this groups and a summary of results on the generic classnumber of exceptional Chevalley groups of adjoint type.The first author acknowledges financial support by a grant of the Deutsche Forschungsgemeinschaft     

Prevention of Lipid Oxidation in Precooked Turkey Meat Patties with Hot Packaging and Antioxidant Combinations

The effects of antioxidants or hot packaging and their combination on lipid oxidation were quite variable depending on the additives in turkey meat. The TBARS values of cooked patties were greatly affected by the degree of oxidation in the raw meat, and the effectiveness of antioxidants varied with added prooxidants. Ascorbate and free radical terminators had stronger antioxidant effects than iron chelators, and chelating iron alone could not eliminate lipid oxidation in either raw or cooked meat with added NaCl. The combination of hot packaging and antioxidants provided cooked patties with better protection from lipid oxidation than either treatment alone.     

基于规则的汉语名名组合的自动释义研究

该文以现代汉语(特别是网络搜索词)中的名名组合为主要研究对象,探索一种基于规则的汉语名名组合的自动释义方法。其研究步骤为: (1)利用《现代汉语语义词典》中名词的语义类别,来建立名名组合的语义类组合模式;(2)在“生成词库论”中物性角色思想的指导下,用名名组合中某个名词的施成角色或功能角色作为释义动词,来揭示这两个名词之间的语义关系;(3)以语义类组合模式为单位构建名名组合的释义模板,并汇集成名名搭配数据库;(4)利用《知网》资源,来获取具体名词的施成角色和功能角色,建立汉语名词知识库。在这两个数据库的基础上,我们初步实现了一个汉语名名组合的自动释义程序。     

装配式建筑自上而下设计信息协同与模型构建

为顺应国家建筑产业化、智能化发展的政策引导,针对当前装配式建筑专业信息缺乏关联、模 型利用不充分、数据传递效率低下等问题,提出基于建筑信息模型(BIM)技术的自上而下设计方法。以装配式 建筑的设计阶段为切入点,详细阐述了基于 BIM 技术的装配式建筑自上而下设计流程。结合装配式建筑的标 准化构件设计和组装特点,提出一种基于自上而下设计的装配模型,并从层级和专业 2 个角度描述了模型的架 构。针对各专业模型传递时的数据信息标准化、一致性问题,通过工业基础类(IFC)标准对装配模型进行实体和 属性集的扩展,提出基于 IFC 标准的各专业、各阶段的自上而下设计信息协同。经实例验证了 IFC 扩展装配模 型的自上而下设计可行性,为装配式建筑的协同设计提供了有益的方法借鉴。     

面向对象技术的多元缔合体系闪蒸模拟

用面向对象技术抽象出闪蒸类结构和功能,实现闪蒸类的封装、继承、属性和方法.对缔合体系汽相采用维里方程,液相用UNIQUAC方程修正其非理想性,校正缔合组分汽相焓的计算,建立相平衡模型.用一维或二维New-ton-Raphson法对缔合和一般体系的闪蒸过程方程组进行多元闪蒸分离计算,模拟结果与文献值对比平均卡机对偏差小于2.46%.软件将面向对象技术和缔合物系热力学模型及数值分析方法结合,进行闪蒸单元操作的模拟分离计算.可作为基础模块用于化工过程流程模拟、分析、优化及系统集成开发并可用于实际生产过程的闪蒸计算.     

脱水过程中无核白葡萄转录组测序及膜脂降解代谢中关键基因的筛选

该研究以吐鲁番地区无核白葡萄为试验材料,在25 ℃常温和30 ℃热风干燥后,取失水25%、50%时褐变和未褐变的样品。利用转录组测序技术筛选出膜脂降解代谢相关的关键基因,并利用实时荧光定量PCR技术对其进行验证,研究结果显示,转录组测序共获得了11.63亿的clean data,当无核白失水50%时未褐变与褐变的相比,在快速脱水组筛选出718个差异表达基因,慢速脱水组2 259个。将上述基因进行GO功能富集和KEGG富集分析后,筛选出43个膜脂代谢相关的差异基因,归类于5种代谢途径。从已获得的差异基因中最终筛选出乙醛脱氢酶7B4（Aldehyde Dehydrogenase7B4,ALDH7B4）、双半乳糖甘油二酯合成酶1（Digalactose Diglycerol Synthetase1,DGD1）、脂氧合酶（Lipoxygenase,LOX）、磷脂磷酸水解酶2（Lipid Phosphate Phosphatase2,LPP2）、二酰基甘油激酶5（Diacylglycerol Kinase5,DGK5）、非特异性磷脂酶C4（Non-specific Phospholipase C4,NPC4）、磷脂酶Dα1（Phospholipase Dα1,PLDα1）7个膜脂代谢相关的关键基因,经qRT-PCR验证,基因表达趋势与转录组测序结果基本一致。结果表明,膜脂降解代谢相关基因表达量变化对无核白脱水褐变有一定影响。     

Development of a water-in-oil-in-water multiple emulsion system integrating biomimetic aqueous-core lipid nanodroplets for protein entity stabilization. Part II: process and product characterization

The aqueous-core enclosed in lipid nanoballoons integrating multiple emulsions of the type water-in-oil-in-water mimic, at least in theory, the environment within viable cells, thus being suitable for housing hydrophilic protein entities such as bioactive proteins, peptides and bacteriophage particles. This study reports a complete physicochemical characterization of optimized biomimetic aqueous-core lipid nanoballoons housing hydrophilic (BSA) protein entities, evolved from a statistical 2³×3¹ factorial design study (three variables at two levels and one variable at three levels) that was the subject of the first paper of a series of three, aiming at complete stabilization of the three-dimensional structure of protein entities attempted via housing the said molecular entities within biomimetic aqueous-core lipid nanoballoons integrating a multiple (W/O/W) emulsion. The statistical factorial design followed led to the production of an optimum W/O/W multiple emulsion possessing quite homogeneous particles with an average hydrodynamic size of (186.2?±?2.6) nm and average Zeta potential of (?36.5?±?0.9) mV, and exhibiting a polydispersity index of 0.206?±?0.014. Additionally, the results obtained for the diffusion coefficient of the lipid nanoballoons integrating the optimized W/O/W multiple emulsion were comparable and of the same order of magnitude (10^?12 m² s^?1) as those published by other authors since, typically, diffusion coefficients for molecules range from 10^?10 to 10^?7 m² s^?1, but diffusion coefficients for nanoparticles are typically of the order of magnitude of 10^?12 m² s^?1.     

Controlling Interactions of Cyclic Oligosaccharides with Hetero‐Oligomeric Nanopores: Kinetics of Binding and Release at the Single‐Molecule Level

Controlling the molecular interactions through protein nanopores is crucial for effectively detecting single molecules. Here, the development of a hetero‐oligomeric nanopore derived from Nocardia farcinica porin AB (NfpAB) is discussed for single‐molecule sensing of biopolymers. Using single‐channel recording, the interaction of cyclic oligosaccharides such as cationic cyclodextrins (CDs) of different symmetries and charges with NfpAB is measured. Studies of the transport kinetics of CDs reveal asymmetric geometry and charge distribution of NfpAB. The applied potential promotes the attachment of the cationic CDs to the negatively charged pore surface due to electrostatic interaction. Further, the attached CDs are released from the pore by reversing the applied potential in time‐resolved blockages. Release of CDs from the pore depends on its charge, size, and magnitude of the applied potential. The kinetics of CD attachment and release is controlled by fine‐tuning the applied potential demonstrating the successful molecular transport across these nanopores. It is suggested that such controlled molecular interactions with protein nanopores using organic templates can be useful for several applications in nanopore technology and single‐molecule chemistry.     

新测试方式下非计算机专业程序设计课程教学探讨

原有教学法在学生实际编程能力上机考试方面存在局限,为适应新的测试方式所带来的教学方法与教学理念的变化,本文结合本校实际,对如何激发与保持学生的学习积极性、实现抽象与模型化的跨越、培养学生的计算思维能力、合理组织实验教学进行探讨,并对实验过程进行监督与综合评价。     

The subsequence composition of a string

Words that appear as constrained subsequences in a text-string are considered as possible indicators of the host string structure, hence also as a possible means of sequence comparison and classification. The constraint consists of imposing a bound on the number ω$\omega$ of positions in the text that may intervene between any two consecutive characters of a subsequence. A subset of such ω$\omega$-sequences is then characterized that consists, in intuitive terms, of sequences that could not be enriched with more characters without losing some occurrence in the text. A compact spatial representation is then proposed for these representative sequences, within which a number of parameters can be defined and measured. In the final part of the paper, such parameters are empirically analyzed on a small collection of text-strings endowed with various degrees of structure.