DNBP生产废水的萃取预处理

为解决4,6–二硝基邻仲丁基苯酚(DNBP)生产过程中的废水污染问题,通过萃取法对该废水进行预处理.萃取最佳实验条件:利用磷酸三丁酯作为萃取剂,煤油为稀释剂,萃取剂的体积分数为70%,萃取时间为30,min,V(废水)∶V(萃取剂)=5∶1,原水不调节pH,直接进行萃取,萃取级数选择两级.在此条件下COD去除率达到80%.同时,NaOH溶液质量分数为20%,V(有机相)∶V(NaOH溶液)=3∶1时,反萃效果最好.     

拟南芥Rad23原核重组蛋白构建和活性检测

在拟南芥中,Rad23基因通过参与泛素/26s蛋白酶体途径调节植物生长发育和激素应答.为进一步研究该基因编码蛋白的分子作用机制及其生物学功能,构建了pCold-Rad23融合蛋白重组表达载体,将该载体转化到大肠杆菌BL21中诱导表达目的蛋白.SDS聚丙烯酰胺凝胶电泳检测结果表明,分子质量为94 ku左右的融合重组蛋白在...     

浅析火灾事故调查的现状与改革措施

火灾事故调查是我国消防机构的首要任务,不但与当事人合法权益有关,而且与公安消防机构的执法形象有关.火灾事故调查是公安消防机构为调查认定火灾原因、核定火灾损失以及查明火灾事故责任所开展的火灾现场询问、现场勘查以及技术鉴定的活动.文章从多方面分析了火灾事故调查的问题和原因,并提出一些改革措施.     

加强高校体育安全体系建设的对策分析

在高等教育快速发展的同时,学校体育意外伤害事故也随之出现高发甚至频发的趋势,这既有害学生的健康成长,损害其家庭的切身利益,也直接影响学校体育教学和管理的正常秩序。试图在对当前高校体育安全性存在的主要问题及其特点进行深入分析的基础上,再对高校体育安全体系的建设提出相应的对策,以期为"十二五"期间,高校体育工作的协调健康发展提供参考价值。     

高血压合并大脑中动脉狭窄患者脑血管反应性与脑梗死的相关性研究

目的探讨高血压合并大脑中动脉狭窄患者的脑血管反应性与脑梗死的相关性.方法选择对象系在吉林省人民医院门诊或住院的老年高血压患者,除外合并糖尿病、高脂血症者,应用TCD测定大脑中动脉血流速度,取合并大脑中动脉狭窄的患者120例及健康对照组30例,依据头部CT或头部MRI的表现,分为症状性梗死组、无症状性梗死组、单纯血管狭窄组、高血压不合并血管狭窄组(单纯高血压组)、健康对照组,利用CO2屏气试验监测脑血管反应性,计数资料间比较使用χ2检验.结果与健康对照组比较,高血压组患者脑血管反应性明显降低(P<0.05),在高血压组中,梗死组脑血管反应性降低的更为显著(P<0.01).结论高血压患者脑血管反应性明显降低,高血压合并颅内血管狭窄的患者脑血管反应性进一步降低,更易发生脑梗死.     

A bio-inspired approach for cognitive radio networks

The recent increasing interest in cognitive radio networks has motivated the study and development of new approaches capable of coping with the intrinsic challenges of this kind of network, such as dynamic spectrum availability, distributed and heterogeneous network architectures, and soaring complexity. The bio-inspired approaches, with appealing characteristics such as autonomy, adaptation and collective intelligence of collaborative individuals, have been extensively studied. This paper presents a comprehensive survey of bio-inspired approaches for cognitive radio networks, emphasizing their domains of application. Specifically, ant colony optimization and particle warm optimization are further investigated with examples and numerical simulation.     

MHC polymorphism and disease-resistance to Edwardsiella tarda in six turbot (Scophthalmus maximus) families

This study examined genetic variation in the major histocompatibility complex(MHC) Class II B gene in turbot(Scophthalmus maximus) by virulent bacterial pathogen challenge.One hundred fry from each of six families were infected with Edwardsiella tarda by intraperitoneal injection.Family mortality ranged from 28.0% to 83.3%.Complete exon 2 and intron 1 sequences of MHC Class II B genes were amplified from five survivor and five non-survivor individuals per family using the clone-sequence method.Thirty-seven sequences from 60 individuals revealed 37 different alleles,25 of which were unique to this study.The 25 unique alleles belonged to 16 major allele types.Nine alleles were used to examine the association between alleles and resistance/susceptibility to disease.Five alleles were present in an individual,suggesting a minimum of three loci or copies of the turbot MHC Class II B gene.The rate of non-synonymous substitution(d N) was 2.30 and 1.58 times higher than synonymous substitution(d S) in the peptide-binding regions(PBR) and non-PBR in whole families,respectively,which suggested balancing selection on exon 2 of the MHC Class II B gene in turbot.One allele,Scma-DBB1*02,was significantly more prevalent in survivor stock than in non-survivor stock(P=0.001).Therefore,this allele might be associated with resistance to bacteria.A second allele,Scma-DBB1*10,was significantly more prevalent in non-survivor stock(P=0.021),and is likely associated with susceptibility to bacteria.     

论《论语》深入浅出的风格

春秋战国时期,文艺争鸣,思想自由,儒、墨、道、法各家形成自己的言论。《论语》是语录体散文,它是儒家经典的代表,它具有深入浅出的风格,它的语言凝练简洁,深入简出,微言大义;它的内涵丰富,对人生的感悟涵盖面广,具有深沉的忧患意识。《论语》的这种特色跟孔子所生活的时代以及他的成长背景与人生经历、阅历相关。     

SS7E型机车抗蛇行减振器座改进设计

对SS7E型机车抗蛇行减振器座的结构和疲劳强度进行分析,并通过结构改进,设计出满足机车运行要求的抗蛇行减振器座。     

高等数学中的RMI原则应用实例

关系映射反演思维是数学中的一种重要思维方法,在许多数学问题的求解中可以通过关系映射反演思维达到化繁为简.研究了RMI原则在函数求导、不定积分计算、微分方程求解、傅里叶级数展开以及数学建模中的应用,目的是培养学生创新思维能力和科学研究的思想方法.