四对的

These dendritic NOBIN derived Schiff base ligands have been applied to titanium catalyzed hetero-Diels-Alder reaction of Danishefshy's diene and aldehydes, affording the corresponding 2-substituted 2, 3-dihydro-4H-pyran-4-one in quantitative yields and excellent enantioselectivities (up to 97. 2%ee). Comparing the reactivities and enantioselectivities of reaction catalyzed by the titanium complexes of these Schiff base ligands, it was found that a series of ligands L〓 were superior to the other three series of ligands L〓, L〓 and L〓, a significant positive NLE and a dendrimer effect existed in the L〓 dendritic catalyst system. The disposition of the dendritic wedges and the dendron size in the ligands were observed to have a significant impact on the enantioselectivity of the reaction.

NOBIN衍生的树枝状大分子希夫碱手性配体与钛形成的配合物在催化不对称杂Diels-Alder反应中的应用将得到的四个系列NOBIN衍生的树枝状希夫碱三齿手性配体与四异丙氧基钛形成的配合物用于催化Danishefsky's diene与醛的不对称杂Diels-Alder反应，通过反应条件的优化，获得了定量的收率和最高达97.2％ee值的对映选择性；考察了这四个系列NOBIN衍生的树枝状希夫碱钛配合物的催化活性和对映选择性，结果发现它们的活性次序依次为L〓≈L〓＞L〓＞L〓，对映选择性次序依次为L〓＞L〓＞L〓＞L〓。

The first part includes two chapters, discussing the engenderment and formation of the conception of Ligeti's structural thinking from a macro perspective, emphasizing the influences from history, culture and the whole musical context in the 20th century. The second part includes four chapters, discussing the techniques used in Ligeti's works from a micro perspective. The third, fourth and fifth chapters emphasize "structural processes", while the sixth chapter analyzes "structural shape".

上篇包括两章，主要对利盖蒂的结构思维观念从产生到形成进行宏观论述，着重探讨了20世纪的历史、文化、音乐创作大背景对利盖蒂结构思维发展的影响：下篇包括四章，主要对利盖蒂的结构思维表现手法进行微观分析，第三、四、五章从"技法形态"对其作品进行分析，第六章从"布局形态"对其作品进行分析，这一部分比第一部分偏重，也是本文的重点。

The calixarenes used as PTC in the fluorination of tetrachlorophthahaloyl chloride to obtain dimethyl tetrafluoroterephthalate were studied in this paper.

研究了杯芳烃在四氯对苯二甲酰氯氟化制备四氟对苯二甲酸二甲酯反应中的相转移催化作用，发现以杯芳烃作相转移催化剂使产品收率得到了明显提高。

Results After many times oral administration of Jiangtangning capsules(40～600mg/kg),the blood glucose of hyperglycemic mice,rats and rabbits induced by adrenaline,glucose,streptozotocin and alloxan was decreased obviously,and had significant dose-effect relationship,the symptoms of polydipsa,polyphagia and polyuria were improved for alloxan-induced hyperglycemic mice and rats,meanwhile the release of insulin in alloxan-induced hyperglycemic mice serum was promoted,but having no apparent influence on the normal blood glucose of mice.

结果 在40～600mg/kg剂量下，多次灌服降糖宁胶囊对肾上腺素、葡萄糖、链脲佐菌素和四氧嘧啶引起的小鼠和大鼠以及家兔高血糖均有明显的降低作用，且有明显的量效关系，还可明显改善四氧嘧啶性高血糖小鼠和大鼠多饮、多食、多尿等三多症状，并可促进四氧嘧啶性高血糖小鼠血清中胰岛素的释放。但对小鼠正常血糖却无明显影响。

According to the static analysis ,the parameter and fixing position of the spring were optimized.

弹簧在双曲柄四杆机构中的安装位置及其刚度对机器人前轮、中轮和后轮的受力都有影响，通过对双曲柄四杆机构的静力学分析优化了弹簧在四杆机构中的安装位置。

In this paper,pose representation by quaternions are researched.With the basic quaternion algebra,the "quaternion based rotations combination theorem" is introduced and proved theoretically.On the basis of this theorem,a method for compute of pose nonliear state transfer function and its linearization is purposed.Then,the computing of the measurement function and the linearization is studied.With the Extended Kalman Filter,the pose is tracked and estimated.

研究用四元数表示物体的姿态，在四元数基本运算法则基础上提出并证明了"基于四元数的多个旋转运动合成规则"，然后将此规则为依据，推导出一种用来计算姿态非线性状态方程系数的方法，对非线性状态转移函数进行线性化，并且研究了测量方程函数的确定及线性化，借助扩展Kalman滤波实现了对姿态的跟踪。

Its body is square and is on the east, south, west, north four directions, four small reliefs protruding as "four images."

其上是方形柱体，各正对东、南、西、北四个方位，凸出的四个小浮雕为"四象"。

Then four-dimensional matrix DCT(4D-MDCT) is performed to get rid of the correlation between pixels in the submatrix.

然后对四维子矩阵运用四维矩阵DCT(4D-MDCT)来去除四维子矩阵中各元素间的相关性。

Objective To evaluate the effect of modified myocardial preservation for surgical treatment of inˉfant tetralogy of Fallot.Methods Fifty-sixinfants,39male and17female with age from3months to12months from January,1997to July,2003were studied.All patients had one stage surgical correction with traditional myocarˉdial preservation（36cases）or modified myocardial preservation（20cases）.

目的 评价改良心肌保护对婴儿法洛四联症期手术治疗的影响方法 1997年1月～2003年7月对56例婴儿法洛四联症病人行一期手术治疗，男39例，女17例，年龄3～12月，平均（9.36±2.80）月，体重3.511kg，平均（8.83±1.25）kg.36例采用传统心肌保护，20例采用改良心肌保护。

The purpose of this study was to examine the effcet of acute exercise and acute exercise after hyperthermic treatment on hsp70 and oxidative stress markers SOD and MDA At the same time, we investigated hsp70 response changes to exercise.

通过观察急性运动和热预处理后急性运动对大鼠股四头肌热休克蛋白70表达影响的时相性变化和氧化应激标志物超氧化物歧化酶活性和丙二醛含量的变化，探讨HSP70对急性运动大鼠股四头肌抗氧化能力的影响和股四头肌HSP70表达的应答性反应。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。