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  family
     Study on Production Management Mode and Product Family Modeling Technology for Mass Customization
     面向大规模定制的生产管理模式及其产品建模技术研究
短句来源
     Study on the Key Technologies of Product Family Planning for Mass Customization
     面向大批量定制的产品规划关键技术研究
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     Statisticcal Analysis of Dispersion Family Nonlinear Model
     散度非线性模型的统计分析
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     On the Deficient Functions, the Singular Directions and Normal Family Theory for Meromorphic Functions
     亚纯函数的亏函数、奇异方向和正规理论
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     Research on Theory and Method of Product Family Model for Customers
     面向客户的产品模型理论与方法研究
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  group
     Pressure Effects on Excitons in Ⅱ-Ⅵ Group Heterostructures
     Ⅱ-Ⅵ半导体异质结构中的激子及其压力效应
短句来源
     Synthesis and Electrochemical Studies on Li-insertion Materials Containing Group VA Elements
     含氮元素嵌锂材料的合成与电化学研究
短句来源
     Growth of VA-VIA Group Compound Semiconductor Thermoelectric Nanofilms Via the Route of Electrochemical Atomic Layer Epitaxy
     VA-VIA化合物半导体纳米热电薄膜的电化学原子层外延生长
短句来源
     Preparation and Characterization of Low Dimensional Semiconductor Nanomaterials (VIa Group)
     低维(VIa化合物)半导体纳米材料的制备及表征
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     Synthesis of ⅣB、Ⅷ Group Complexes of Pyridine Monoimines and Their Catalystic Properties in Ethylene Oligomerization and Polymerization
     吡啶亚胺类ⅣB、Ⅷ金属配合物的合成及乙烯齐聚和聚合研究
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  families
     Families of Stopping σ-fields{F_Z~T}_Z∈R~2+ on Plane Satisfy F_1-F_4 Conditions
     平面停止σ域{F_Z~T}_Z∈R_+~2满足条件F_1-F_4
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     Empirical Bayes test (EBT) is considered for testing H_0:θ≤θ_0(>)H_1:θ>θ_0 in the uniform distribution families, f (x|θ)=c(θ)I_((?)
     考虑均匀分布U(θ,cθ),f(x|θ)=((c—1)θ)~(-1)I_((θ.cθ))(x),x,θ∈(0,∞),c>1中检验问题H_0:θ≤θ_0(?)
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     In this paper,we give new infinite families of k tight optimal double loop networks,the number of whose nodes being n(t,a) =3t 2+(2i?1)t +B(a),wherei=1,2,3,k=0,1,2,L,20.
     本文构造含n(t,a)=3t 2+(2i-1)t+B(a)个结点的k紧优双环网的无限,其中i=1,2,3,k=0,1,2,L,20.
短句来源
     Convergent Rates of Empirical Bayes Estimation of the Parameter of Garmma Distribution Families Γ{θ,1/2}
     伽玛分布Γ{θ,1/2}参数的经验Bayes估计的收敛速度
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     Study of CF families and CF families
     CF及CF的研究
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  ethnic
     Ethnic group,nation and minzu in China
     Ethnic group(群)、Nation(民)与中国的民
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     [Objective] To investigate genetic polymorphism of fifteen short tandem repeat (STR) loci (D3S1358, THO1, D21S11, D18S51, VWA, CSF1PO, D8S1179, TPOX, FGA, D5S818, D13S317, D7S820, D16S539, D19S433, D2S1338) in Hainan Li ethnic population.
     【目的】研究海南黎人群15个STR位点D3S1358、TH01、D21S11、D18S51、VWA、CSF1PO、D8S1179、TPOX、FGA、D5S818、D13S317、D7S820、D16S539、D19S433、D2S1338的遗传多态性。
短句来源
     Early Meanings and Application of the Terms "Ethnos" and "Ethnic Group
     Ethnos(民)和Ethnic group(群)的早期含义与应用
短句来源
     Theories of Ethnic Identity and the Revelations to Education
     群认同理论及其对教育的启示
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     A Study of the Meaning of Ethnic Group
     民,还是“群”——释ethnic group一词的涵义
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  family
We present a new family of discrete subgroups ofSO (5, 1) isomorphic to lattices inSO (3, 1).
      
In this paper we explicitly determine the virtual representations of the finite Weyl subgroups of the affine Weyl group on the cohomology of the space of affine flags containing a family of elementsnt in an affine Lie algebra.
      
We give as an application a family of singular Schubert varieties.
      
In this paper1 we obtain a simple formula for the depth of the ring of invariants for a family of modular representations.
      
This family includes all modular representations of cyclic groups.
      
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  group
In all these cases we actually show that Γ=π1(M) has a finite index subgroup which is mapped onto a nonabelian free group.
      
We define a map from an affine Weyl group to the set of conjugacy classes of an ordinary Weyl group.
      
Open subsets of projective spaces with a good quotient by an action of a reductive group
      
The aim of the paper is to describe all open subsets of a projective space with an action of a reductive group which admits a good quotient.
      
Reductive group actions on affine quadrics with 1-dimensional quotient: Linearization when a linear model exists
      
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  families
We consider two important families of BCn-symmetric polynomials, namely Okounkov's
      
Applications to compactly supported biorthogonal wavelet decompositions of families of Besov spaces are also given.
      
The connection with multiresolution wavelet analysis is based on families of pseudodilations of a different type.
      
Consequently, we are able to establish that a large class of Gabor families generate Banach frames for Lp (Rn) when 1≤p>amp;lt;∞.
      
Means and families of operators generated by Bochner-Riesz kernels are studied.
      
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  ethnic
vulnificus substantiated the claims of the ethnic uses.
      
The Relationship between the NAT2 Phenotype Polymorphism and Predisposition to Suicide in Ethnic Populations
      
Genetic risk factors of arterial hypertension: Analysis of ischemic stroke patients from the Yakut ethnic group
      
The Use of Ethnic Metabolic Portraiture for the Choice of Individual Pharmacotherapy Strategy as Exemplified by N-Acetylation an
      
The Use of Ethnic Portraiture for Predicting Individual Sensitivity to Chemicals as Exemplified by N-Acetylation in Cancer Patie
      
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  其他


The crystal structure of P4S3 has a. unit cell with a= 3.64, b= 10.56 and c = 9.62A,which contains eight molecules. The space group isThe Patterson function P(o,o,w)and the intensities of reflections 00l hinted that the spacs group is D2h16 and P4S3 molecules of Hassel-Pettersen type sit on the mirror planes of the structure. An approximate structure was then dotennined on basis of steric considerations and the Patterson functions P (u, 1/2, Wp), P (u,1/2, w8), P(1/2, v, 1/2-wp), P (1/2, v,1/2-w8), P(u,1/2,O)...

The crystal structure of P4S3 has a. unit cell with a= 3.64, b= 10.56 and c = 9.62A,which contains eight molecules. The space group isThe Patterson function P(o,o,w)and the intensities of reflections 00l hinted that the spacs group is D2h16 and P4S3 molecules of Hassel-Pettersen type sit on the mirror planes of the structure. An approximate structure was then dotennined on basis of steric considerations and the Patterson functions P (u, 1/2, Wp), P (u,1/2, w8), P(1/2, v, 1/2-wp), P (1/2, v,1/2-w8), P(u,1/2,O) and P(1/2, v,1/2), where wp and w8 are the intramolecular distances respectively of the two P atoms and the two S atoms related by a mirror plane of the molecule. The structure was confirmed by the Fourier projection p (x, y) and by calculation of structure factors for reflections 00l and hk0.In crystal, the P4S3 molecules are of Hassel-Pettersen type. The present work confirms this conclusion in a convincing fashion. The approximate values of bond lengths and bond angle are P-P = 2.25A, P-S = 2.06A, P-S-P = 103?

P_4S_3晶体的空间群为D_(4h)~(16)-P2_1/b2_1/n2_1/m,每个晶胞中含有8个P_4S_3分子,正交晶胞3个晶轴的长度各为 a=13.64埃 b=10.56埃 c=9.62埃按照衍射谱中的系统消光,晶体的空间群亦可能为C_v~9-Pbn2_1。 从Patterson函数P(0,0,w)与衍射谱00l的强度数据中,可以得出晶体的空间群为D_(2h)~(16)与Hassel和Pettersen式的P_4S_3分子坐在结构中对称面上的工作假定以及原子的z坐标等,从而根据P(u,1/2,w_p),P(u,1/2,w_s),P(1/2,v,1/2-w_p),P(1/2,v,1/2-w_s),P(u,1/2,o)和P(1/2,v,1/2),其中w_p与W_s各为每一分子中由对称面联系着的一对P原子与S原子间的距离,以及P和S原子的共价半径、van der Waals半径等得出了各原子的x,y坐标。引得的试用结构最后又经Fourier投影ρ(x,y)与结构因子的计算得到肯定与修正。 在P_4S_3晶体中,分子系Hassel-Pettersen式的P_4S_3分子。本工作很可信服地肯定了这一点。键长与...

P_4S_3晶体的空间群为D_(4h)~(16)-P2_1/b2_1/n2_1/m,每个晶胞中含有8个P_4S_3分子,正交晶胞3个晶轴的长度各为 a=13.64埃 b=10.56埃 c=9.62埃按照衍射谱中的系统消光,晶体的空间群亦可能为C_v~9-Pbn2_1。 从Patterson函数P(0,0,w)与衍射谱00l的强度数据中,可以得出晶体的空间群为D_(2h)~(16)与Hassel和Pettersen式的P_4S_3分子坐在结构中对称面上的工作假定以及原子的z坐标等,从而根据P(u,1/2,w_p),P(u,1/2,w_s),P(1/2,v,1/2-w_p),P(1/2,v,1/2-w_s),P(u,1/2,o)和P(1/2,v,1/2),其中w_p与W_s各为每一分子中由对称面联系着的一对P原子与S原子间的距离,以及P和S原子的共价半径、van der Waals半径等得出了各原子的x,y坐标。引得的试用结构最后又经Fourier投影ρ(x,y)与结构因子的计算得到肯定与修正。 在P_4S_3晶体中,分子系Hassel-Pettersen式的P_4S_3分子。本工作很可信服地肯定了这一点。键长与键角的近似值为P-P=2.25 A,P—S=2.06 A,P—S—P—103°。 本工作是作者在氮元素硫化物结构化学方面进行的研究工作的一部分。

The condensation of urea, acetyl-acetone and various aldehydes gave 2-keto-4-R-5-acetyl-6-methyl-1,2,3,4-tetrahydro-pyrimidine (Ⅰ), following the course of the reaction according to Biginelli condensation, which was reinvestigated by Johnson and his co-workers.Both aliphatic and aromatic aldehydes were used in the reaction. Inorganic and organic acid accelerated the reaction so that a series of new pyrimidine derivatives (Tahle 1) was obtained in good yields.Table 1 2-Keto-4-R-5-acetyl-6-methyl-1,2,3,4-tetrahydro-pyrimidinesCompound...

The condensation of urea, acetyl-acetone and various aldehydes gave 2-keto-4-R-5-acetyl-6-methyl-1,2,3,4-tetrahydro-pyrimidine (Ⅰ), following the course of the reaction according to Biginelli condensation, which was reinvestigated by Johnson and his co-workers.Both aliphatic and aromatic aldehydes were used in the reaction. Inorganic and organic acid accelerated the reaction so that a series of new pyrimidine derivatives (Tahle 1) was obtained in good yields.Table 1 2-Keto-4-R-5-acetyl-6-methyl-1,2,3,4-tetrahydro-pyrimidinesCompound Nature of R Yield % m.p.Ⅰ_A Phenyl 55 239-240°Ⅰ_B 3′-Methyl-4′-hydroxy-phenyl 64.5 238-240°Ⅰ_c 3′,4′-Dimethoxy-phenyl 44 212-213°Ⅰ_D 2′-Hydroxy-phenyl 49 226-227°Ⅰ_E 2′-Methoxy-phenyl 40 251-253°Ⅰ_F 4′-Dimethylamino-phenyl 40 260-261°Ⅰ_G 3′-Nitrophenyl 70 285°Ⅰ_H Cinnamyl 90 221-222°Ⅰ_I α-Furyl 89 215-216°Ⅰ_J Ethyl 32 171-172.5°Nevertheless, the condensation of urea and acetyl-acetone with aliphatic aldehydes; such as n-heptylic aldehyde and iso-valeric aldehyde, did not follow the course of the reaction according to Biginelli condensation. In this case, instead of 2-keto-4-R-5-acetyl-6-methyl-1,2,3,4-tetrahydro-pyrimidine (Ⅰ), 4-ureido-2-keto-4,6-dimethyl-1,2,3,4-tetrahydro-pyrimidine(Ⅱ) was isolated. Though aliphatic aldehydes, such as n-heptylic aldehyde and isovaleric aldehyde, were incorporated in the condensation, yet they did not involve in the reaction.

1.本文成功地縮合了(1)尿素,(2)乙醯基丙酮和(3)各種醛類;而成一系列的2-酮-5-乙醯基-1,2,3,4-四氫化嘧啶。此種反應類似Biginelli的縮合反應;而酸催速縮合作用。 2.脂肪醛中的庚醛和異戊醛用於此縮合反應中,並未按照上述規律起作用,所生的反應不是所希望的;當有酸存在时,乙醯基丙酮与尿素在乙醇中縮合生成4-脲基-2-酮-4,6-二甲基-1,2,3,4-四氫化嘧啶;而所引用的庚醛或異戊醛並未進入化學反應。

Experiments are performed to use a brand of Chinese filter paper in paper chromatographic analysis. The paper used is the "fine" grade filter paper manufactured by the First Eastern Factory, Fou-Shun. It appears that the filter paper, after adequate treatment, may be used in paper chromatographic work. Treatment essentially consists of washing with dilute hydrochloric acid and distilled water and ascending with suitable solvents of the particular cation-groups. In this experiment, the solvents used for chromatographic...

Experiments are performed to use a brand of Chinese filter paper in paper chromatographic analysis. The paper used is the "fine" grade filter paper manufactured by the First Eastern Factory, Fou-Shun. It appears that the filter paper, after adequate treatment, may be used in paper chromatographic work. Treatment essentially consists of washing with dilute hydrochloric acid and distilled water and ascending with suitable solvents of the particular cation-groups. In this experiment, the solvents used for chromatographic analysis of aluminium, silver and arsenic groups were modified from that used by F. H. Burstall and others. The results are summarized as follows:Group I R_f: K 0.45, Na 0.56, Mg 0.71Group Ⅱ R_f: Ba 0.45, Sr 0.53, Ca 0.61Group Ⅲa R_f: Al 0.02, Zn 0.73Group Ⅲb R_f: Fe 0.99, Co 0.44, Mn 0.30, Ni 0.00Group Ⅳa R_f: Ag 0.16, Pb 0.00, Hg 0.80Group Ⅳb R_f: Pb 0.02, Cu 0.30, Bi 0.67, Cd 0.82, Hg 0.90Group V R_f: As 0.79, Sb 0.93, Sn 0.95Besides, we have found a number of common reagents which can be used to develop the cations on such kind of filter paper. After chromatographic separation, their sensitivity is determined. The R_f of both the ascending and descending processes has very close values. When temperature varies within 5°C, the R_f values change very little.

1.国产抚顺东一廠细号濾纸对无机阳离子層析的效果不低於进口滤纸。为了適應该纸的性質,铝、银、砷所用溶剂曾略加修改。并找出该纸所含杂質较多,使用前须先用该组溶剂上昇一次,同时又可消除鬼斑(ghost spot)。 2.在此国产濾纸上较全面地整理了各分析组离子層析的条件,以便於未知物在此纸上进行系统層析及检验。并對層析後的離子进行了靈敏度的测定。 3.在国产纸上層析无机陽離子时,温度以及上昇法與下降法對R_f值之影响不大。

 
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