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Among the open-chain crown ethers and cryptands with a same structure, the compounds disubstituted at the amide nitrogen atoms show the larger extractability for Am and Eu than the monosubstituted ones. The compounds disubstituted at the amide nitrogen atoms by two phenyl groups show the larger extractability for Am and Eu than those by two alkyl groups.

3在结构相同的开链冠醚和开链穴醚中,酰胺氮原子上二取代化合物对Am和Eu的萃取能力大于一取代化合物;酰胺氮原子上两个取代基都是苯基的化合物对Am和Eu的萃取能力大于两个取代基都是烷基的化合物。

First, this paper gives an introduction of some methods of unequal probability sampling, their estimators and variance estimators, including sampling with pps with replacement, methods of sampling without replacement suggested by Brewer, Durbin, Sampford , Des Raj , Murthy , Rao-Hartley-Cochran. Then, at the basis of Rao and Bayless's study , we consider that population can be splited two random subpopulations, which are respectively drawn from different infinite super-populations, and compare the stabilities of estimators of the methods that given above.

本文首先从理论上介绍了若干种不等概率抽样方法,它们的估计量、估计量的方差及其估计,其中包括有放回PPZ及PPS抽样,不放回不等概率抽样中的Brewer、Durbin、Sampford、Des Raj,Murthy、Rao-Hartley-Cochran等人的方法;其次,在Rao和Bayless两人就样本单元数n=2的情形对上述抽样方法进行比较的基础上,将总体随机地分成两个子总体,视每个子总体取自不同的线性超总体,在文中,我们利用计算机实现随机分组,并通过画图比较各方法估计量的稳定性,结果表明,对变异系数C.V。

First, this paper gives an introduction of some methods of unequal probability sampling, their estimators and variance estimators, including sampling with pps with replacement, methods of sampling without replacement suggested by Brewer, Durbin, Sampford , Des Raj , Murthy , Rao-Hartley-Cochran.Then, at the basis of Rao and Baylesss study , we consider that population can be splited two random subpopulations, which are respectively drawn from different infinite super-populations, and compare the stabilities of estimators of the methods that given above.

本文首先从理论上介绍了若干种不等概率抽样方法,它们的估计量、估计量的方差及其估计,其中包括有放回PPZ及PPS抽样,不放回不等概率抽样中的Brewer、Durbin、Sampford、Des Raj,Murthy、Rao-Hartley-Cochran等人的方法;其次,在Rao和Bayless两人就样本单元数n=2的情形对上述抽样方法进行比较的基础上,将总体随机地分成两个子总体,视每个子总体取自不同的线性超总体,在文中,我们利用计算机实现随机分组,并通过画图比较各方法估计量的稳定性,结果表明,对变异系数C.V。

Density Functional Theory method was used to optimize the geometries of 209 PCDE molecules, 209 PBDE molecules and 75 PCDD molecules at the B3LYP/6-31G* level. Using computed structural parameters as theoretical descriptors, the forward stepwise multiple regression technique was adopted to obtain QSPR models of environmental partition properties for these POPs by using GQSARF 2.0 and SPSS12.0 for windows programs. The obtained QSPR models are as follows:(1) QSPR models for predicting subcooled liquid vapor pressure, n-octanol/water partition coefficients lgK_(ow and subcooled liquid water solubilities -lgS_(w,l of PCDEs, of which correlative coefficients (R~2) are 0.988, 0.958 and 0.959 and the root-mean-square-error of estimation are 0.134, 0.116 and 0.327 respectively.(2) QSPR models of lgPL and n-octanol/air partition coefficients lgK_(oa for PBDEs, which both contain three structural parameters. The values of R2 for the two models are both 0.997 while the values of RMSEE are 0.073 and 0.062 respectively.(3) QSPR models of lgKow and–lgS_ for PCDEs, which both have one variable (mean molecular polarizability,α). The values of R~2 for the two models are 0.978 and 0.866 and the values of RMSEE are 0.300 and 0.270 respectively.(4) The molecular structures of 24 substituted naphthaline compounds were optimized using Hartree-Fock and DFT methods at four different levels and the same means was used to obtain four three-parameter (EHOMO, q~+ andα) QSPR models of lgK_. The model at the HF/6-311G** level is the best one of which R2 is 0.9662 and RMSEE is 0.380.(5) QSPR study for environmental partition properties of PCDEs was also performed using position of Cl substitution method in which simple parameters of substitution position were taken as descriptors. The multiple linear regression was performed with GQSARF 2.0 and SSPS 12.0 for windows programs to obtain QSPR models of lgP_L, lgK_ and–lgS_ for PCDEs of which R~2 are 0.991, 0.983 and 0.965 and RMSEE are 0.311, 0.100 and 0.300 respectively.

采用密度泛函理论方法在B3LYP/6-31G*水平上对PCDEs、PBDEs和PCDDs的分子结构进行了全优化计算,以计算得到的量子化学参数作为理论描述符,采用GQSARF 2.0和SPSS 12.0 for windows统计程序进行正向逐步回归分析,建立了这些POPs的环境分配性质的QSPR模型:(1) PCDEs的过冷液体蒸汽压、正辛醇/水分配系数lgK_(ow和水溶解度-lgS_(w,l的QSPR模型,这3个QSPR模型的相关系数(R2)分别为0.988、0.958和0.959,估计的均方根误差分别为0.134、0.116和0.327;(2) PBDEs的lgPL和正辛醇/空气分配系数lgK_(oa的QSPR模型,这两个模型都包含三个分子结构参数,其R~2都为0.997,RSMEE分别为0.073和0.062;(3) PCDDs类化合物的lgK_和-lgS_w的QSPR模型,两个模型都只含一个变量,其R~2分别为0.978和0.866,RSMEE分别为0.300和0.270;(4)采用Hartree-Fock和DFT方法,在4种不同水平上优化计算了24个取代萘系列化合物的分子结构,采用上述同样的方法分别建立了四种水平上的三变量lgK_模型,通过比较得到,在HF/6-311G**水平计算得到的模型最好,R为0.966,RSMEE为0.380;(5)同时,采用氯原子取代位置方法对PCDEs的环境分配性质进行QSPR研究,建立了PCDEs的lgPL、lgK_和-lgS_的QSPR模型,其R~2分别为0.991、0.983和0.965,RSMEE分别为0.110、0.100和0.300。

For firms' adoption behavior, this thesis firstly explains why firms' adoption is in order from the static state by analyzing the regular pattern of firms' adoption behavior; builds control model of firms' adoption decision behavior, and describes the relationship between the stable values of response probability of firms' adoption decision; secondly raises the conception of firms' states from the dynamic state and defines two state variables to explain why and how a firm changes from nonadoption to adoption through the dynamic analysis of the factors influencing the two state variables. Thirdly, constructs the functions of adopting and choosing behavior with mathematical method, which is verified in following.

对于企业采用行为,首先从静态角度剖析了企业采用行为的一般机理用以说明为什么各企业在采用技术创新上有先有后,并建立了企业采用决策行为模型,定量刻画企业采用决策响应概率与动力结构的关系;其次从动态角度提出了企业状态演变概念并定义了两个状态变量,通过对两个状态变量的影响因素分析和动态分析,用以说明某一企业为什么和如何实现由未采用者到采用者的转变;第三对企业采用行为进行定量形式化构造了采用效果函数及选择概率函数等,并得到了调查结果的支持。

Methods: The sample consisted143 children which were in early permanent dentition of ClassⅡ,Division 1malocclusion .Pre-and post-treatment study models were assessed using PeerAssessment Rating index. According to the outcome of treatment, thesecases were classified into three types as "worse, no different","improved"and"greatly improved". The cephalometric analysis and Model Analysis werepreformed with pretreatment lateral cephalograms and study models for"improved"and "greatly improved"cases."T"–test was assessed to find out thesignificant difference between the extraction and nonextraction, and the resultsincluding age factor were analyzed by stepwise discriminant analysis.

应用PAR 指数对矫治前后的143 副恒牙早期的安氏Ⅱ类1 分类错牙合患者牙牙合模型进行评估分析,按矫治结果等级分为三类A、变坏或无改善,B、改善,C、极大改善,然后将B、C 两类患者矫治前的头影测量片及模型分析数据按拔牙与未拔牙进行成组t 检验的单因素分析,找出两组间有显著差异的软硬组织和牙牙合模型指标,对这些指标合并年龄因素进行逐步判别分析。

Under the condition of linear demand function, we analyzed the method of second degree price discrimination and compared it s characteristics in the case of two oligarchic enterprises that have equal power and a leading and a following one by using the method of game theory.

在线性需求函数条件下,用博弈论的方法对两实力相当寡头和 1领导厂商 1追随厂商市场情形二度价格歧视的方法进行分析,并对两情形价格歧视的特点作了比较。

Through the traditional physiological and biochemical method, together with the 16SrDNA sequence homology and phylogenetic analysis, the strains were identified. The result shows they belong to the genus photobacterium, but they differ from any species of this genus in some characteristic which suggests they might be new species, and their taxonomic placement needs more information on genes level.

对两株菌进行鉴定,分析其生理生化特征和16SrDNA产物序列,确定这两株菌均属于发光杆菌属,但是和该属的各种还有一定差异,对其分类地位的最后确定还需进一步的系统发育学分析。

Tetrahydroisowuinolin derivatives and phthalide derivatives were designed and synthesized on the basis of a PDE4 inhibitor pharmacophore model set up through computer simulation. Some tetrahydroisowuinolin derivatives synthesized were evaluated on their activity against PDE4 for study on the structure-activity relationship.(7-cyclopentyloxy)-6-methoxy-3,4-dihydroisoquinolin-2(1H)-yl(4-hydroxy-3-methoxyphenyl)methanone (155) and Methyl 7--6-methoxy-2-(4-methoxy- benzoyl)-1-phenyl-1,2,3,4-tetrahydroisoquinoline-3-carboxylate (170) showed good activity against PDE4, which were chosen as the lead compounds to design and synthesize another analogs in order to develop selective PDE4 inhibitors with better activity.

分别设计合成了以四氢异喹啉和氨基苯酞为骨架的两类小分子杂环化合物,并对部分四氢异喹啉衍生物测试了其相关的生物活性,初步确定了其构效关系,发现了两个对PDE4有较好抑制活性的先导化合物(7-cyclopentyloxy)-6-methoxy-3,4-dihydroisoquinolin-2(1H)-yl(4-hydroxy-3-methoxyphenyl)methanone (155)和Methyl 7--6-methoxy-2-(4-methoxy- benzoyl)-1-phenyl-1,2,3,4-tetrahydroisoquinoline-3-carboxylate (170)。

The result suggests that IGF-IR and EGFR might be involved in mediating the effects of energy intake on the development of reproductive system in prepubertal gilts.

结果表明:日粮能量水平显著影响初情期前母猪卵巢上两种生长因子受体的表达,高能量对表达有促进作用,有利于两种生长因子作用的发挥,从而利于生殖系统的生长发育;因此,IGF-1R和EGFR可能参与介导能量摄入对初情期前母猪生殖系统发育的影响。

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However, as the name(read-only memory)implies, CD disks cannot be written onorchanged in any way.

然而,正如其名字所指出的那样,CD盘不能写,也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

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A single payment file can be uploaded from an ERP system to effect all pan-China RMB payments and overseas payments in all currencies.

付款指令文件可从您的 ERP 系统上传到我们的电子银行系统来只是国内及对海外各种币种付款。