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Liquid-phase epoxidation of allyl chloride with hydrogen peroxide was carried out over Ti-MWW, a novel titanosilicate with the MWW structure, to synthesize epichiorohydrin selectively and effectively. Ti-MWW proved to be superior to the conventional TS-1 catalyst in both catalytic activity and product selectivity. Ti-MWW prefers aprotic solvents of acetone and acetonitrile, both of which can restrain the solvolysis of epichiorohydrin, whereas TS-1 favors a protic solvent of methanol.

研究了具有MWW结构的新一代钛硅分子筛Ti-MWW催化剂对烯丙基氯液相环氧化高效合成环氧氯丙烷的催化性能结果表明,Ti-MWW的催化活性以及产物选择性均优于传统的钛硅分子筛TS-1,对于Ti-MWW,合适的溶剂为非质子性溶剂丙酮和乙腈,在该溶剂中环氧化物不易发生溶剂化开环反应;而对于TS-1,合适的溶剂是质子性溶剂甲醇,但甲醇可导致醇醚副产物的生成。

The spermatogonium puirity (including the PGP9.5 cells and the c-kit cells) to achieved above 82% by percoll density of 27-35% and panning method and PGP9.5 cells were (63.6±3.2)% and (71.9±4.1)% respectively.

通过收集27~35%Percoll梯度间的细胞或盘化法纯化后,回收精原细胞纯度(包括PGP9.5 和c-kit 细胞)均达到82%以上,其中PGP9.5 细胞分别占(63.6±3.2)%和(71.9±4.1)%,而c-kit 分别占(21.2±1.8)%和(11.5±0.8)%。

Tricholoma may be a paraphyletic genus two. The collections identified as T. caligatum is a mixture. Some parts of them from France are members of T. matsutake, the other parts from North America are closed to T. bakamatsutake and T. fulvocastaneum. Tricholoma robustum and T. focale form a clade which is obviously a sister group of the stirp Subannulate. The stirp Caligata was defined as a group mainly on the basis of the predominant veil. But from the result of molecular systematic analysis, the presence of veil is not a stable character in the matsutake group. Species having symbiosis with conifers and broad leaf tree are all transformed from those whose host specificity is not strict. The phylogenetic tree based on ITS sequences resembled the tree of NJ algorithm based on cladistic coding. In the phylogenetic tree based on morphylogical characters, T. zangii and T. bakamatsutake form a clade, but it is the result of convergent evolution as suggested by molecular analyses. The distribution area of the matsutake group can be divided into six regions: middle and northern Europe region, Mediterranean region, Hengduan Mount.— Southeastern Tibet region, Northeastern China—Japan—Far-east Russia region, the Atlantic—North America region and the Rocky Mountain region. The abundance center of the matsutake group are Hengduan Mount.—Southeastern Tibet region and the Rocky Mountain region. Hengduan Mount.

松口蘑群的分子系统学研究得出的结果有:由于粗壮口蘑和羽衣口蘑明显和亚环族(Tricholoma,section subannulate)的种类是来自同一个谱系,和其它松口蘑群的种不具有最近共同祖先,因此松口蘑群是一个多系群;松口蘑群和口蘑属其他种类的亲缘关系比和蜜环菌属更接近;梭柄松苞菇和松口蘑群的差距明显小于油黄口蘑(T.flavovirens)和棕灰口蘑;口蘑属是一个多系群;鉴定为欧洲口蘑的标本明显不是一个单系群,其中一部分是松口蘑,另一部分和黄褐口蘑及傻松口蘑(T.bakamatsutake)比较接近;划分松口蘑群的标准是菌环的存在,但从分子系统学的结果来看,菌环的存在与否并非是一个很稳定的性状;和针叶树专性共生及和阔叶树专性共生均由寄主专化性不强的种类转化而来;在形态学系统发育树上青冈口蘑和傻松口蘑被聚为一个分枝,分子系统学的研究结果表明,这是趋同进化的结果;用支序方法编码作出的NJ树的结果更接近ITS序列的结果。

The morphology and stoichiometry of the films were studied with transmission electron microscopy .

研究发现,在所选的几个系统里采用IBAD技术均实现了非晶化,还发现了某些新相形成和相演化现象,表现出与多层膜离子束混合不同的相形成规律。

Additionally, stolon connection greatly increased root/shoot ratio of LH ramet while significantly decreased that of HL ramet.

这表明,当互连分株置于由低光照高养分斑块和高光照低养分斑块组成的异质性环境中时, 3种植物克隆分株均发生了环境诱导的功能特化。

After 24 weeks,the operation area of group A was more smooth,and the surrounding normal cartilage naturally straight flush,transparent form new cartilage,subchondral bone formation in good condition;Group B restoration surgery the basic integrity of the cartilage tissue, center is not yet fully integrated,there was slight depression;CollagenⅡimmunohistochemistry of cartilage that was new brown area.Group C has no formation of articular cartilage.The growth and the intergration of subchondral bone of group A and B were better.

术后24周取材,见A组山羊手术区关节表面较为光滑,与周边正常软骨自然连续平齐,透明的新生软骨组织形成,软骨下骨形成完好;B组山羊手术区修复的软骨组织基本完整,中心部位仍未完全融合,有微小凹陷;Ⅱ型胶原免疫组化示新生软骨组织呈棕黄色。C组术区关节凹陷,无关节软骨组织形成。A组和B组,软骨下骨的生长及与周围组织的结合均较好,无植入物脱落现象的发生。

Firstly, the performances of linear and nonlinear algorithms based on interference estimator/subtracter are compared. Secondly, a novel interference suppression algorithm based on subspace tracking is proposed for the tone interference model. Finally, the stability performance of the transform domain normalized least mean square adaptively implementing structure of minimum bit error ratio receiver is analyzed.

总结和比较了基于AR干扰模型的各种干扰估计抵消算法性能;从音调干扰模型出发,提出一种新的基于子空间跟踪的时域干扰抑制技术;讨论了基于低速数字干扰等效"虚拟"多用户干扰模型的最小误码率接收机的变换域归一化最小均方自适应实现结构及其稳态性能。

In the plan, newly constructs the time and the new technical time and Chen immediately, we consider suitableness in the soft hardware facility, the style which the building high molds are grand, match the carrying capacity the safe consideration, as soon as unfolds the polytropism which the housing life and the economics and trade factory manages has, and brings into line with the disposition which the optical fiber line, the e link controls, reaches the best life, the work residence motion feeling.

在新建筑与科技时代并陈的当下,我们在全盘规划中均考量合宜,以楼高规划所塑造的气派宏伟,搭配楼板载重的安全考量,一展住宅生活与经贸厂办所具备的多元性,并纳入最新建材设备规划配置(如:光纤线路、e化的环控),以达最佳生活、办公居所的现代感。

In all tests,the boronised sulfonate detergents showed better performances in comparison with the conv ...

在所有的对比试验中,硼化磺酸盐清净剂均显示了较好的特性。

The influence of degree of sulfonation on the properties of copolymers, such as component, solubility and inherent viscosity were studied.

结果表明DMF,DMAc,NMP等均是该磺化聚酰亚胺的良溶剂,聚合物粘度随着磺酸基含量的增加而降低。

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Recall that, in the Kolmogorov axiomatization, measurable sets are the sets which have a probability or, in other words, the sets corresponding to yes/no questions that have a probabilistic answer.

延期开工的Kolmogorov宣布要衡量所有套职能有限许多坐标限制在于衡量子寅。换句话说,如果是/否的问题回答f可看的价值观念在许多最有限坐标,然后它有一个概率的答案。

The experimental results showed that the algorithm can filter singular points and remain fixity of the target edge.

实验表明:基于模糊理论的图像智能滤波方法比常规图像滤波方法运算量小,它既能去除奇异点,又能保持图像中目标的边缘不变性,具有很好的滤波效果。

It explains in detail how the methods of elicitation, discussion, and induction are to be used in the physics teaching.

本文根据心理学原理论述了改革初中物理教学的必要性,并对"启发、讨论、归纳法"在物理教学中的应用作了详细的阐述。