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In this paper we define the concept of Projective Blaschke manifolds and extend the theory of equiaffine differential geometry to the projective Blaschke manifolds. We prved that if M be a complete projective Blaschke n-sphere and its universal covering manifold is isometric to a complete (n+1) dimensional parabolic, elliptic or hyperbolic affine hypersphere, then M is a quotient space of E^n, S^n or D^n by a isometric subgroup of its corresponding spaces.

在这篇文章中我们定义了射影Blaschke流形的概念,将等仿射微分几何的理论推广到了射影Blaschke流形,并证明:如果n维完备射影Blaschke 超球面 M 的通用覆盖流形分别是完备的抛物型、椭圆型或双曲型仿射球,则M分别是n维欧氏空间、n维超球面或n维单位圆盘关于各自空间的一个等距离散子群的商,从而对完备射影Blaschke 超球面进行了分类。

Theorem 2 Let M~n be a compact totally real minimal submanifold in M~n which is a locally symmetric Bochner-Kaehler manifold.If the infimum of sectional curvature R_c in M~n satisfies: then M~n must be totally geodesic in M~n.

定理2 M~n是局部对称Bochner-Kaehler流形M~n中紧致全实极小子流形,如果M~n截面曲率下确界R_c满足:则M~n必是全测地的。

If N is a nonempty subset of a left R module M, then N is a submodule of M if and only if the following conditions hold:(1) x+y is in N for any element x,y in N;(2) rx is in N for any r in the ring R, and any x in N.

假设 N 是左模的非空子集合,那么N 是子模的充分必要条件是,对N 中的任何两个元素x,y有

N\nTotal disk capacity:%s\nUsed disk space:%s\nAvailable disk space:%s\nRequired disk space:%s\nRemaining disk space after import:%s\n

n\n磁盘总容量:%s\n已使用容量:%s\n可用容量:%s\n需要容量:%s\n导入后剩余容量:%s\n

Rate constants of carbon dioxide radical anion〓 reacting with 5,5dimethyl-1-pyrroline-N-oxide、1-naphthoquinone and N,N,N,N-tetramethyl 1,4 -phenylene diamine were determined by detecting the changes of radical concentrations with time, and they were 5.5×10〓mol〓Ls〓、4.5×10〓mol〓Ls〓 and 6.7×10〓nol〓Ls〓 respectively.

测定了在含〓的CdS胶体体系中〓与5,5-二甲基-1-吡咯氮氧化物、1-萘醌和N,N,N,N-四甲基对苯二胺正离子自由基反应的速率常数,它们分别为5.5×10〓mol〓Ls〓、4.5×l0〓mol〓Ls〓和6.7×10〓mol〓Ls〓。

When initial NO3--N was leached, the correlation coefficients between soil initial NO3--N and mineral N extracted by CaCl2 before aerobic incubation with raygrass nitrogen uptake were decreased to 0.613 and 0.607, respectively, and both reached 5% significantly level. However, the correlation coefficients between mineralizable N extracted by aerobic incubation, soil initial mineral N and mineralizable N extracted by aerobic incubation, N0 and soil initial mineral N and N0 with raygrass nitrogen uptake were raised obviously, and all reached 5% and 1% significant level.

以不包括土壤起始NO3--N盆栽试验植物吸氮量为参比,通气培养前CaCl2淋洗起始NO3--N和起始矿质氮与五期黑麦草地上部氮素累积量间的相关性尽管有所降低,但相关性仍达5%显著水平,相关系数分别为0.613和0.607;而通气培养30周矿化氮素、土壤起始矿质氮+通气培养30周矿化氮素、N0及N0+起始矿质氮与五期黑麦草地上部吸氮量的相关系数却明显提高,相关系数分别为0.718,0.782,0.688 和0.640,均达5%或1%显著水平。

Several aminated Fullerene derivatives were synthesized by the reaction of C〓 with phenylamine, diphenylamine and triethylamine etc., the phenomena of fragmentation and aggregation of the aminated Fullerene derivatives in UV laser desorption ionization mass spectrometer was observed, a few nitrogenous poly-Fullerene ions, such as C〓NH, C〓N〓H〓, C〓N〓H〓, C〓N〓H〓, C〓N〓H〓 etc.

对C〓富勒烯与苯胺、二苯胺、三乙胺等形成的加合物在紫外激光解吸电离作用下可以发生不同寻常的裂解和聚合现象进行了研究,认为其形成机理为:上述加合物在紫外激光解吸电离作用下,发生裂解产生C〓NH、C〓N及C〓等离子,然后它们之间发生聚合,形成如:C〓NH、C〓N〓H〓、C〓N〓H〓、C〓N〓H〓、C〓N〓H〓等含氮原子的聚富勒烯离子。

In this paper, polystyrene-b-poly(styrene-co-acrylonitrile) diblock copolymer was prepared by atom transfer radical polymerization.,with CuBr/N,N,N,N",N"-pentamethyl diethene triamine as the catalyst system.

本文以CuBr/nN,N,N,N&,N&-五甲基二亚乙基三胺为催化体系,研究了原子转移自由基聚合法PSt-b-P两嵌段聚合物的合成。

Most negative charges are distributed on N(4) and N(1) with N(4) being the most. Above 3000cm-1 C-substituted tetrazoles have more and stronger absorption lines than the corresponding N-substituted isomers.

环负电荷主要分布在N(4)和N(1)原子上且N(4)较N(1)为多。C-取代物的IR光谱在3000cm-1以上有较强吸收而N-取代物则较小,且前者的强吸收线多于后者。

The result show that the N elements curbed the transition from anatase phase to rutile phase , Doped-N was in the structure of the TiO2 as the form of Ti-O-N and formed a new bond energy level;N-doped changed the paramagnetic of the characteristics. The paramagnetic resonance spectrum of TiO2 showed anisotropic and showed hyperfine splitting, The Lande factor of Ti3 + combined with the N is 1.956. UV-Vis absorption spectra showed that the photocatalytic ability of photocatalyst TiO2-xNx to expand to the visible region, the sample (3.84wt %) has the highest photo catalytic activity, the adsorption edge extend to 520nm and degradation is 55.54% under the visible light for 1.5h.

研究结果显示,N元素抑制了锐钛矿相向金红石相的转变,阻止了晶粒的长大,掺杂的N元素以O-Ti-N的形式存在于光催化剂结构中,形成了新的能级结构;N掺杂改变了催化剂的顺磁特征,使TiO2的顺磁共振谱线呈现各向异性,发生了超精细分裂,其中g2=1.956,是与N结合的Ti3+的朗德因子;紫外可见光吸收谱表明,催化剂TiO2-xNx的光响应能力拓展到可见光区,光吸收带发生红移;光催化测试结果显示,掺杂量为3.84的TiO2-xNx在可见光区的响应能力最高,吸收波长延伸至520nm,其光催化活性最大,1.5h降解率达到55.54%。

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As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸,那乌黑、忧郁的眼睛,她便会相信,他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失

But because of its youthful corporate culture—most people are hustled out of the door in their mid-40s—it had no one to send.

但是因为该公司年轻的企业文化——大多数员工在40来岁的时候都被请出公司——一时间没有好的人选。