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Diels-Alder reaction between β-myrcene and maleic anhydride catalyzed by SO(superscript 2- subscript 4)/TiO2-ZrO2 solid superacid was investigated.

研究了SO(上标 2-下标 4)/TiO2-ZrO2型固体超强酸催化剂的制备及其催化β-月桂烯与马来酸酐的Diels-Alder反应，通过GC、GC-MS和红外分析，确定其主产物为4-（4-甲基－3-戊烯基）－4-环己烯-1，2-酸酐。

H higher than those for shanyou 63 respectively, the calcium contents in extracts, the Mg(superscript 2+)-ATPase activities on the chloroplast membranes, the cyclic photophosphorylation activities of the flag leaf sheathes and blades for Liangyoupeijiu were also higher than those for Shanyou 63; the means of noncyclic photophosphorylation activities of the flag leaf sheathes and blades for Liangyoupeijiu were 0.25 and 0.31 μmol/ higher than those for Shanyou 63, respectively; the photochemical avtivities of the flag leaf sheathes and blades for Liangyoupeijiu were significantly higher than those of its parents at most stages, showing heterosis over mid-parent or heterobeltiosis.

h，且大多数时期达显著或极显著水平；两优培九剑叶叶鞘及其叶片浸出液钙含量均显著或极显著高于汕优63；两优培九剑叶叶鞘及其叶片叶绿体膜上Mg(上标 2+)-ATPase活性的均值均高于汕优63，大多数时期达显著或极显著水平；两优培九剑叶叶鞘及其叶片循环光合磷酸化活性的均值也均高于汕优63，近一半时期达显著或极显著水平；非循环光合磷酸化活性的均值分别比汕优63高0.25和0.31μmol/mg？

Soil pH was in significant negative correlation with exchangeable acid and nonexchangeable acid, but in significant positive correlation with base saturation, which is mainly restrained by dominant exchangeable Ca(superscript 2+).

3土壤pH与交换性酸、非交换性酸含量呈极显著负相关，而与盐基饱和度呈极显著正相关，且主要受占优势的交换性Ca制约。

Based on the genomic DNA extracted from Ochotona curzoniae, the effects of the main reaction system elements such as Mg(superscript 2+), dNTPs, primer, template DNA, Taq DNA polymerase and annealing temperature were presented by single factor experiment.

方法］以高原鼠兔基因组DNA为模板，通过单因素试验，对体系中的模板浓度、Mg(上标 2+)浓度、dNTPs浓度、Taq酶用量、引物用量、退火温度进行探讨。

Methods According to the oestradiol level on progesterone initiation day, 279 hormone replacement-frozen embryo transfer cycles were grouped into three groups group 1, percentile 0-25(superscript th; group 2, percentile 26-75; group 3, percentile 76-100.

按照激素替代－冻融胚胎移植患者黄体酮开始注射日血清雌二醇质量浓度的百分位数，将279个周期进行分组（组1百分位数为0~25，组2为26~75，组3为76~100）。

In this paper, four kinds of Fe(superscript 2+) adjustments for omphacite have been compared on the basis of the peak p-t estimates and petrologic investigations of different eclogites across the Taihu and Tongcheng areas from the South Dabie Terrane.

榴辉岩中绿辉石的Fe(上标 2+)校正是一直存在争论的问题，它直接影响到榴辉岩p-t条件的精确评价。

NO3(superscript -)-N pollution in drinking water at the depth of 20 m is serious with common and serious overproof rates of 39.3% and 7.1% respectively. NO3(superscritp -)-N content in irrigation water for farmland and greenhouse at the depth of 40 m is 7.4 mgL^(-1) and 9.6 mgL^(-1) with respective common overproof rates of 25.0% and 37.5%, and zero serious overproof rate.

设施蔬菜栽培区表层地下水（地下饮用水，20m）受硝态氮污染严重，超标率和严重超标率为39.3%和7.1%；而深层地下水（农田和大棚灌溉水，40m）硝态氮含量7.4mgL^(-1)和9.6mgL^(-1)，超标率分别为25.0%和37.5%，无严重超标水样。

Pentaerythrityl tetraacetate was synthesized from acetic acid and pentaerythrite, catalyzed by SO(superscript 2- subscript 4)/TiO2-La2O3 rare-earth solid superacid. Various factors affecting the reaction were discussed.

以稀土固体超强酸SO(上标 2-下标 4)/TiO2-La2O3为催化剂，乙酸和季戊四醇为原料合成季戊四醇四乙酸酯，并考察了影响反应的因素。

It was shown that under Cd(superscript 2+) stress, Phaseolus aureus had a higher antioxidative capacity than Vicia sativa.

研究表明，Cd(上标 2+)胁迫下箭舌豌豆的抗氧化能力高于绿豆的抗氧化能力。

The contents of chlorophyll were also decreased. New protein spots were induced and some protein spots were lost in root, plumular axis, chloroplast, when seedlings were treated with 1.0 mmol/L Cd(superscript 2+). A positive relationship was observed between the inhibition of seedling growth and changes in biochemical characteristics.

在1.0mmol/L Cd(上标 2+)溶液处理下，与对照相比，黄瓜幼苗的根、胚轴、叶绿体中的蛋白质组分发生变化，即蛋白缺失、新蛋白合成以及蛋白表达量的上调或下降，同时其生化性状（蛋白质组分、叶绿素含量）的变化与幼苗生长抑制呈正相关。

The work of this paper is as follows: 1. Looking back the progressing history of the linear motor, introducing the features of the elevator driven by linear induction motor, radicating the topic of this paper "the digital frequency variable control of the elevator bi-side direct driven by linear induction motor". The research of this paper covers the conventional VVVF control, space vector based VVVF control, vector control and DTC.

本文主要开展了以下几个方面的工作： 1 回顾了直线电机发展历史，电机的驱动技术演变，特别是针对直线电机的驱动，简要介绍了直线感应电机驱动电梯的优点和不同结构类型，对传统的v／f控制，基于空间矢量法的v／f控制，矢量控制，和基于电压空间矢量的直接转矩控制进行了比较，确立了本课题的研究主题：直线感应电机双边直推式驱动电梯的全数字变频控制。

The article combines with the treatment of a superficial civil air defense work to introduce how the grouting method to improve the performance of the backfill soil.

文章从治理漂浮人防工事的角度提出了注浆技术在改善回填土性质方面的应用，并详细阐述了注浆技术的施工流程。