查询词典 R.

Let R be an abelian ring ( all idempotents of R lie in the center of R), and A be an idempotent matrix over R.

设R是一阿贝尔环(R的所有幂等元都在中心里)，A是R上的一幂等阵。

In addition, we obtain the following results:(1) A ring R is weakly unit-regular if and only if so is the n×n matrix ring Mn of R for any n≥1;(2) Let R be a ring such that R/J is regular.

另外，我们还证明了下面两个结果：(1)环R是弱幺正则的当且仅当Mn(n≥1)是弱幺正则环；(2)假设R是一个环且使得R/J是正则环。

One is theexplicit formula for strict-connected acyclic hypergraphs:〓where a=r-d,m=/a;the other is the recurrence formula for linearacyclic hypergraphs:〓where the numbers of r-1 and r in the multinomial coefficient are j and krespectively,〓 and 〓.

一个是关于严格-维连通无圈超图的显式公式：〓其中a=r-d，m=/a；另一个是线形无圈超图的递推公式：1=〓其中r-1与r在多重组合数中的重数分别是j与k，〓且f(0，r)=1。

The aerobic bacteria andtotal microorganism were the highest in autumn and the lowest in winter;Theactinomycetes was the highest in spring and the lowest in winter;The rhizospherefungi was the highest in autumn and the lowest in winter, the non-rhizosphere fungi was the highest in spring and the lowest in winter.The average microorganism"s R/Sof four seasons in Eucalyptus grandis plantation is 1.40,the aerobic bacteria"s averageR/S of four seasons is 1.40,the actinomyeetes"s average R/S of four seasons is 1.40,thefungi"s average R/S of four seasons is 1.41.The uprightness distribution rule ofrhizosphere and non-rhizosphere soil microorganism in Eucalyptus grandis plantationwere the same,the trend is surface layer(0-20cm)＞middle layer(20-40cm)＞underlayer(40-60cm).Compared with the amount of microorganism in 2004, the amount ofmicroorganism in 2006 had a definite drop.

好气性细菌及微生物总数量秋季最高、冬季最低；放线菌数量春季最高、冬季最低；真菌数量根系土壤秋季最高、冬季最低，根外土壤春季最高、冬季最低；巨桉人工林三大类微生物四季的平均R／S值1.40，好气性细菌四个季度平均R／S值1.40，放线菌四个季度平均R／S值1.40，真菌四个季度平均R／S值1.41；巨桉人工林两样地根系与根外土壤微生物垂直分布规律一致，土壤微生物三大类及微生物总数量的垂直变化总的趋势是表层(0～20cm)＞中层(20～40cm)＞下层(40～60cm)；相比较2004年土壤微生物数量，2006年三大类数量及微生物总数均有一定程度的下降。

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。

Substituted-2-aminobenthiazoles were dissolved in a mixture of acetic acid,phosphoric acid and propionic acid, and diazotized by nitrosylsulphuric acid, then coupled with m-dimethylaminobenzoicacid to form 6-R-BTAMB in good yield.

我们在2-氨基苯并噻唑的6-位引入了不同的取代基R，合成了6种新试剂，2-I2'-(6'-R-苯并噻唑)偶氮-5-二甲氨基苯甲酸(6-R-BTAMB，R=〓，〓，Cl，Br，〓，〓，)，并研究了6-R-BTAMB与Fe、Co、Ni、Cu和Pd的络合显色反应的光度性能及不同R基团对试剂灵敏度及选择性的影响将6-〓-BTAMB应用于测定铝合金，电镀废液中的铜，人体毛发和矿泉水中铁的含量均取得了满意的结果。

Results showed that, the specific refining energy consumption is decreased with increment of rotation speed of the primary refiner. At freeness level of about 670 mL CSF, for example, the specific refining energy consumptions is 363 kWh/t o.d. at 3000 r/min, and 305 kWh/t o.d. at 3500 r/min, which is equivalent to 16% energy saving, furthermore the specific energy consumption is only 265 kWh/t o.d. at 4000 r/min, which means 27% less refining energy required. At the same time, pulps produced at higher refiner speed have higher strength properties and lower shives contents. There is little change of optical properties of the pulps.

结果表明：小叶桉物料在相同条件下进行汽蒸、挤压和化学预浸渍后，分别采用3500 r/min和4000 r/min的盘磨转速进行第一段磨浆，浆料磨至游离度670 mL时所需磨浆电耗与3000 r/min时的相比，分别下降16%和27%；浆料中纤维束含量分别降低20%和35%；第一段磨后浆料再分别经相同盘磨转速（3000 r/min）的后续磨浆后，与相近游离度的浆料性能比较可知，随第一段磨浆盘磨转速的提高，浆料的细小组分含量略有增加，纤维束含量显著降低，强度性能有不同程度的改善，但光学性能变化不显著。

In order to elucidate the regulation mechanism of RU5 region to BFV gene expression, BFV3026 provirus DNA was used to construct the plasmids containing different deletion of R region, which were cotransfected with luc report gene locatied behind the IP promoter to BL12 cells, and luciferase activities was assayed, confirming that U5 region could repress the initiation function of LTR as well as IP. The BFV structure genes with different deletion of R region were cloned closely behind to heterogenous CMV promoter, then transfected to 293T cells, RT activity was performed, testifying the R region was required for BFV pol gene expression, and also the function domain was identified within the 100n.t. sequence at the 5′end.

以牛泡沫病毒(Bovine foamy virus， BFV)中国株BFV3026原病毒DNA为材料，构建R区系列缺失质粒，通过对其转染细胞中RT水平及对缺失质粒与luc报告质粒共转染细胞中萤火虫荧光素酶活性的测定，确立U5区对于BFV3026两类启动子LTR和IP均具有负调控作用；同时将带有不同R区的BFV3026结构基因片段克隆于异源启动子CMV之下，通过对其转染细胞293T中RT酶活性的测定，确立R区对于病毒结构基因pol的表达具有一定的调节作用，并将其功能区域初步界定在R区5′端100bp内。

One L-glutamic acid high-producing strain TN6319 with genetic maker (FEA~r+KMA~r+SG~r ) was screened through shake tube primary screening ,shake flask second screening,genetic marker test and single clone isolation and continuous passage cultibation.this strain could produce L-glutamic 72.9g/L after fermentation 42h under the fermentation without being optimized.

经摇管初筛、摇瓶复筛、遗传标记验证、单菌落分离和连续传代，最终筛选出一株L-谷氨酸高产菌TN6319(氟乙酸~r、酮基丙二酸~r、谷氨酰胺~r、磺胺胍~r)，该菌株在未优化条件下发酵42h产L-谷氨酸79.2g/L。

The sequences analysis indicated that complete open read frame of F gene of 3 isolates was 1662bp and encoded F protein of SS3 amino acids/There were 6 identically potential asparagine-linked glycosylation sites and the deduced amino acid sequence of the cleavage site region of F protein of the 3 NDV isolates that had the same amino acids pattern as velogenic strain was ~(112)R-R-Q-K/R-R-F~(117), which was accordant with the results of mean death time of chicken embryos and intracerebral pathogenicity index flCPI.

序列分析结果表明，所获得的3株分离株F基因完整的开放阅读框长度为1662bp，共编码F蛋白的553个氨基酸：QH3、HU和A4株均有相同的6个潜在的糖基化位点，其F基因的裂解位点为~(112)R-R-Q-K／R-R-F~(117)，符合强毒株裂解区氨基酸组成的特征，且与MDT和ICPI的测定结果相吻合。

Chrysanthemum of 10 thousand birthday is lax to edaphic requirement, with the arenaceous qualitative loam with fecund, good drainage had better.

万寿菊对土壤要求不严，以肥沃。排水良好的砂质壤土为好。

He unstepped the mast and furled the sail and tied it.

他拔下桅杆，把帆卷起，系住。