值

The concept of strict value reduct is proposed, and an improved algorithm for computing value reducts is given. In Chapter 4, we study how to utilize Rough Set theory effectively for an information system with continuous attributes. At first, we propose an approach of discretizing attributes one by one.

本文在第一章对数据挖掘的基本问题和主要手段进行了简单综述，在第二章对粗糙集理论作了简要介绍后，在第三章中对粗糙集中的值约简进行了研究，提出了严格值约简的概念，使得值约简的过程可以在没有封闭世界假设的情况下也能进行，并提出了求值约简的改进方法。

Results EROD activities in liver of wild crucian from Zhangtan, Jiangjunyan, Fuyang and Wenyan (23.51±4.17, 16.79±7.39, 18.74±5.16, 18.65±8.86 nmol/) were significantly higher than that of Jiekou (7.84±2.42 nmol/g promin), and no difference was observed between the other sites and Jiekou. Three dose groups (0.25, 0.50, 1.00L/dish water sample extracts) were used in Ames test. Reversional mutation rate of TA98 colony exposed to extracts from Zhangtan was 2.21, 3.39, 6.95 without S9, and 2.70, 4.07, 6.23 with S9, respectively. The revesional mutation of TA100 colony was 2.55, 2.81, 5.36 without S9, and 1.73, 2.86, 4.14 with S9, respectively. Reversional mutation rate of TA98 colony exposed to 1.00L/dish extracts from Jiangjunyan with S9 was 2.22, and there was a dose-response relationship in reversional colony count. Ames tests of the other extracts were negative.

结果 樟潭、将军岩、富阳、闻堰点位野生鲫鱼肝EROD酶活性分别为(23.51±4.17)，(16.79±7.39)，(18.74±5.16)，(18.65±8.86)nmol/，明显高于街口[(7.84±2.42)nmol/]，其他点位与对照比较差异无统计学意义；樟潭水样浓集物在浓度为0.25，0.50，1.00 L/皿时在不加与加S9条件下，TA98回变菌落突变率MR值分别为2.21，3.39，6.95，2.70，4.07，6.23；TA100回变菌落MR值分别为2.55，2.81，5.36，1.73，2.86，4.14；Ames试验结果为明显阳性；将军岩水样浓集物在浓度为1.00 L/皿且加S9条件下TA98MR值为2.22，且在浓度为0.25，0.50，1.00 L/皿加S9条件下TA98回变菌落数呈剂量－反应关系，MR值分别为0.88，1.98，2.22；Ames试验结果为弱阳性；其他点位均为阴性。

We explore the relation between structure and activity , structure and toxicity from electronic structure and three—dimensional conformation in order to provide theoretical foundations for predicting the activity and toxicity of these chemical compounds, researching into mechanism of action and choosing safener.

通过比较四种均三氮苯类除草剂的红外光谱特征吸收的实验值和计算值，并运用规范不变原子轨道法GIAO法在RHF/6-31G水平上计算出西玛津的δ~1H-NMR和δ~(13)C-NMR，与实验值的对比统计分析，结果表明：用RHF/6-31G优化的分子构型最佳，AM1法次之，考虑到优化时间和研究的需要，我们在研究均三氮苯类除草剂分子的结构与活性关系时，为了进行深入、精确的理论研究，采用从头算RHF/6-31G进行优化；而对于此类化合物的结构与毒性的关系研究时，更注重分子的量子化学参数的相对值而非绝对值，因而采用AM1的方法。

The study of the forming condition and mechanism of immature oil in eastern Linqing depression reveals that brackish water-brine, abundant sulfur bacteria and sulfocompounds provided favorable conch-lions for the formation of the immature oil. Immature oil was the result of hydrogen-rich sapropel of lower activation energy degraded by sulfur bacteria. T and R of the early hydrocarbon generation of organic matter were 400~435℃ and 0.2%~0.5% respectively, and their values for peak hydrocarbon generaion are 420℃ and 0.35%.

通过对渤海湾盆地临清坳陷东部未熟－低熟油的形成条件及形成机制探讨，总结出沙一段和沙三段的微咸水－咸水介质环境、丰富硫细菌和含硫化合物为临清坳陷东部未熟－低熟油气形成提供了有利条件，证实该区未熟－低熟油气形成是低活化能的富氢腐泥组分受到硫细菌早期低温降解作用的结果，明确该区未熟－低熟烃源岩硫细菌降解的有机质早期生烃阶段的T值为400~435℃，R值为0.2%~0.5%，生油高峰T值为420℃，R值为0.35%左右。

The study of the forming condition and mechanism of immature oil in eastern Linqing depression reveals that brackish water\|brine, abundant sulfur bacteria and sulfocompounds provided favorable conditions for the formation of the immature oil. Immature oil was the result of hydrogen-rich sapropel of lower activation energy degraded by sulfur bacteria. Tmax and Ro of the early hydrocarbon generation of organic matter were 400~435℃ and 0.2％~0.5％ respectively, and their values for peak hydrocarbon generaion are 420℃ and 0.35%.

通过对渤海湾盆地临清坳陷东部未熟-低熟油的形成条件及形成机制探讨，总结出沙一段和沙三段的微咸水-咸水介质环境、丰富硫细菌和含硫化合物为临清坳陷东部未熟-低熟油气形成提供了有利条件，证实该区未熟-低熟油气形成是低活化能的富氢腐泥组分受到硫细菌早期低温降解作用的结果，明确该区未熟-低熟烃源岩硫细菌降解的有机质早期生烃阶段的Tmax 值为400~435℃， RO值为0.2％~0.5％，生油高峰Tmax值为420℃，RO值为0.35%左右。

In order to avoid thee one sidedness of using only one index to decide the wear extent,a comprehensive deterioration index is put froward based on thee theory of fuzzy comprehensive analysis,and the corresponding criteria are set up also.

为了避免使用一种铁谱定量参数的劣化值进行磨损状态判别时存在的片面性，运用模糊评判理论，引入综合劣化值概念，建立了评判标准；针对引入的劣化值，开发了相应的数据处理系统，用于劣化值计算及磨损状态判别。

The effects of solution\'s pH value, mol ratio between phenyl aldehyde and L-Arginine, concentrations of sodium chloride, ammonia chloride andL-Lystine, initial concentration of L-Arginine on precipitation rate of a -tolylene arginine were investigated, the results indicated that phenyl aldehyde precipitation method\'s appropriate pH value was higher than 11, suitable mol ratio between phenyl aldehyde and L-Arginine was 1.25, initial concentration of L-Arginine was must higher than 15g/L, sodium chloride had little effect on precipitation rate, on the contrary, ammonia chloride and L-Lystine had great effect on it, both of them must be eliminated; At the same time, adsorption isotherm at 25 C of L-Lystine on anion exchange resin A was measured, the result showed that the maximal equilibrium adsorbance was 30mg/g, the influences of solution\'s pH value, temperature, concentration of chloride ion on adsorption of L-Lystine by anion exchange resin A were also studied, the results indicated that appropriate operational pH value was 0.5 0.2, the effect of temperature on adsorption ratio was little, process could be operated at room temperature, the concentration of chloride ion must be eliminated.

考察了溶液pH值、苯甲醛与L-精氨酸摩尔比、氯化钠与氯化铵浓度、L-赖氨酸浓度、L-精氨酸初始浓度对苯甲醛沉淀L-精氨酸的影响，结果表明，沉淀反应的适宜pH值大于11，苯甲醛与L-精氨酸的适宜摩尔比为1.25，(来源：Aa6BC论文网www.abclunwen.com)L-精氨酸适宜的初始浓度在15g/L以上，氯化钠的存在对沉淀率基本上没有影响，而氯化铵和L-赖氨酸的存在使沉淀率下降；同时测定了25℃时阴离子交换树脂A吸附L-赖氨酸的吸附等温线，表明其最大平衡吸附量为30mg/g，考察了溶液pH值、温度、氯离子浓度对阴离子交换树脂A吸附脱除L-赖氨酸的影响，结果显示从L-精氨酸和L-赖氨酸混合液中吸附分离出L-赖氨酸的适宜pH值为10.5±0.2，温度对L-赖氨酸吸附率影响不大，吸附过程可在室温下进行，氯离子的存在使L-赖氨酸的吸附率降低。

Was investigated.The result shows that for thin plates,The strength of the plates decrease and the plasticity increase with anneal temperatare rising,while thick plates is not so sensitive to anneal temperature.The variation of heat-treatment parametar has less effect on the microstructure of TA15 plate.Thin plates have higher strength and lower plasticity longitudinally and transversally, and lower strength ...

结果表明，对于薄板而言提高退火温度材料强度降低、塑性提高，而对厚板这种现象不明显；热处理参数的变化对TA15合金板材的显微组织影响不大；薄板沿纵向和横向强度值较高，塑性值偏低，而45°方向强度值偏低，塑性较好；厚板横向强度值较纵向、45°方向的要高。

The adoption of one single value for k eliminates the discontinuity in the case of hybrid eclipses and ends confusion arising from the use of two different values; however, the use of even the "best" mean value for the Moon's radius introduces a problem in predicting the true character and duration of umbral eclipses, particularly total eclipses.

采纳单一的K值排除了使用2个不同的值在全环食时计算的衔接不上；然而，在使用这个最合适的值计算月球半径时出现一个问题，即预报的实际值和本影持续时间之间出现问题，特备在日全食的时候。

Then based on SURE unbias estimation, LMS algorithm and the new threshold function, this paper proposes a speech enhancement method called adaptive wavelet coefficients subtraction.

在小波阈值去噪的方法中，为满足时变信号的实时处理要求，本文首先提出一种新的阈值函数，新阈值函数克服了传统阈值函数的缺点，具有无穷阶连续导数。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。