构

Hack's law, which can be derived from the second and third Horton's models, is same to allometric relationships between area and population of urban systems, the latter is connected with Beckmann's models and thereby with central place theory.

然后证明基于中心地理论的Beckmann城镇等级—规模模型与 Horton水系构成第一、第二定律数理同构，关于城市人口—城区面积的异速生长关系模型与关于主河道长度—流域面积的几何测度关系模型以及 Horton水系构成的第二、第三定律数理同构

It was found that the binaphthyl backbone of S configuration was matched to the S, S pyrrolidino group. In this case, the asymmetric allylation product could be obtained in 85. 6% ee.

轴手性是S构型时，和中心手性S，S构型相匹配，它和钯形成的络合物在催化烯丙基取代反应时，取得了比不含中心手性因素的吡咯烷基氮膦配体高得多的对映选择性，可以得到85.6％ee值的产物。

The optimal carrier gas velocity of prepared SE-30 series capillary chromatographic columns was studied and used to separate isomeric compounds. The efficiency of SE-30 capillary chromatographic columns has been studied with different diameters, film thicknesses and oven temperatures, using n-do-decane, phenol, aminobenzene, and butyl acetate as test samples.

研究自制的SE-30系列毛细管气相色谱柱的载气最佳线速度，并应用于同分异构体的色谱分离分别用十二烷、苯酚、苯胺、醋酸丁酯作试祥在不同载气线速条件下对不同口径、不同膜厚、不同柱温的SE-30毛细管色谱柱的柱效进行考察，并在最佳线速度条件下分离异戊醇、硝基氯苯、硝基甲苯及二乙苯同分异构体体系。

In chapter four, the chiral recognition properties of one chiral calix [4] crown ether toward amygdalic acid and dibenzoyl-tartaric acid were studied by 〓H NMR,〓C NMR and UV-vis spectroscopy.

研究结果表明，手性杯[4]氮杂冠醚对二者均有一定的手性识别能力，并发现针对不同的客体，主体以不同的构象与之相互作用，证实分子识别过程中存在构象的变化。

It may have a preventional function from Alzheimer's disease. Molecular biological studies are shown that apoE isoform has a isoform-specific role to neurodegeneration. ApoE〓 and apoE〓 aid to sustain the stabilization of cytoskeleton protein tau, while apoE〓 hyperphosphorylates tau to destabilize the microtubule protein, which will make neurocyte easy to form neurofibrillary tangles in AD. Clearance of amyloidal peptide by apoE〓 and apoE〓 is more effective than by apoE〓. ApoE〓 has the strongest ability to clear the amyloidal peptide. It is shown that apoE〓 has a stronger prevention from Alzheimer's disease.

分子生物学研究发现，apoE异构体对神经细胞退化表现出异构体特异作用，apoE〓和apoE〓有助于维持微管的稳定性，而apoE〓则使tau蛋白超磷酸化，破坏微管的稳定性，使神经细胞易于形成神经纤维缠结。apoE〓和apoE〓对A β的清除率远远高于apoE〓，apoE〓对A β的清除能力最强，可见apoE〓对AD的发生具有较强的阻止作用。

In this paper, several texture techniques, such as hot processing, oriented consolidation of anisometric particles, templated grain growth, reactive templated grain growth and multi-layer grain growth techniques, and along with their development and applications to Lead-free piezoceramics, are reviewed.

本文综述了几种常用的织构化工艺，包括热处理技术、非等轴粒子取向固化技术、模板晶粒生长技术、反应模板晶粒生长技术和多层晶粒生长法的发展与应用，并详细讨论了每一种工艺对陶瓷微结构和织构化生长机制的影响。

The structures derived from bicapped square antiprism in configuration are lower in total energy, while those from triangle prism are less stable.

由三棱柱演变的构型能量居中。带心结构和共边构型带有高配位原子，其总能量较高，是不稳定的结构。

After the carboxymethylation,the solubility of pachyman in the water was significantly increased,its β-D-glucan characteristic absorption peak at 890 cm-1 became weak obviously,and its methylene vibration absorption peak and CO antisymmetrical stretch vibration absorption peak appeared at 1 333 and 1 606 cm-1 respectively,which indicated that the carboxymethylation succeeded.The analysis of AFM results showed that CMP molecules existed in different morphology under different solution conditions,and that the concentration,ionic strength and solvent physical chemistry characteristics of polysaccharide solution had effects on the CMP chains conformation and the action mode between different molecular chains.The phenomena were considered to be related to hydrogen bond association and intramolecular and intermolecular electrostatic interactions of CMP.

结果表明：经过羧甲基修饰，茯苓多糖在水中的溶解性显著增加，890 cm-1 处的β-D-葡聚糖特征吸收峰明显减弱，1 333 cm-1 处出现次甲基振动吸收峰，1 606 cm-1 处出现〖JG(〗C〖ZJLX，Y〗O〖JG)〗非对称伸缩振动吸收峰，表明羧甲基化成功；原子力显微镜分析表明：在不同溶液条件下，CMP分子以不同形态存在，多糖溶液的浓度、离子强度及溶剂的物化特性均能对CMP的分子链构象及链间相互作用形式产生影响，推测可能与CMP分子内、分子间的氢键缔合及静电作用有关，CMP分子与云母基底间的吸附及静电作用也会对CMP的分子链构象及图像质量产生影响。

The isomerization principle of independent double bonds of unsaturated fatty acids from Chinese featural arboroid oils-stillingia oil was first studied in the paper in China. The synthesis principle, properties of products and practical experiment of the derivatives of conjugate acids were also discussed.

本文以中国特产木本油脂—梓油为原料，在国内首次对油脂不饱和脂肪酸孤立双键的异构化反应规律进行了系统的研究，并以异构化反应所得共轭酸为原料，对共轭酸衍生物系统产品的合成规律、产品性能及应用性实验进行了一定程度的探索。

The interstitial configurations and the displacement energies in some typical directions are simulated in the atomistic point of view.

用计算机模拟方法在原子尺度上研究了TiAl合金中间隙原子的各种可能构型，并且对Ti原子和Al原子在一些典型反冲方向上的位移阈能和最终产生的相关缺陷构型进行了模拟研究。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷