偶联剂修饰纳米磁性粒子红外光谱及相关分析

以三氯化铁水溶液作前驱体，采用部分还原沉淀法，通过控制一些影响反应的参数，制备纳米磁性粒子(magnetic nanoparticles，MNes)，并分别用Z-6020，Z-6030和Z-6040硅烷偶联剂对其进行表面修饰．利用红外光谱、古埃磁天平、可见光分光光度计等手段，对MNPs的表面包覆官能团、磁化率、稳定性等进行表征．红外光谱分析表明，选用不同的偶联剂修饰MNPs，可以在其表面包覆各种活性的有机基团，除都含有大量-OH之外，用Z-6020修饰的MNPs还含有-NH2和-NH；用Z-6030修饰的，还含有-C-O和-C-C；用Z-6040修饰的，还含有-C-O，-C-O-C和-C-OH．同时，用Z-6020修饰的MNPs磁化率最高，稳定性较差；用Z-6040的，磁化率次之，稳定性最好；用Z-6030的，磁化率最低，稳定性最差．     

砂轮平衡精度对工件表面粗糙度影响的研究

对砂轮平衡精度与磨削加工工件表面粗糙度之间关系作了研究 ,通过理论与实验 ,给出了砂轮不平衡量与工件表面粗糙度关系式。为砂轮在线液体平衡的方法减小砂轮表面粗糙值提供了理论与实践依据     

发展中国股市必须做到“一个坚持、三个反对”

中国股市为我国社会主义现代化建设和市场经济体制建设作出了不可磨灭的历史贡献，但目前已经陷入由制度设计失败和政策失误导致的危机之中，必须正视股市危机的现实；发展中国股市必须坚持从实际出发、实事求是的原则；必须反对左的思想和行为的干扰，反对生搬硬套、食洋不化的行为，反对官僚主义对完善股市制度建设和投资人利益的漠视。     

Decision trees for forecasting

Recent years have seen an increasing cross-fertilization between the fields of decision analysis and forecasting. Decision-analytic models often require forecasts as inputs, and aspects of the Bayesian decision-theoretic framework underlying decision analysis have proved useful to forecasting, particularly in contexts where subjective judgemental inputs are required. This paper describes the use of decision tree analysis for forecasting and illustrates its use for corporate divisional forecasting and planning. A specialized decision-analytic technique, acts as events, is also described and illustrated to forecast a new product's earnings. Conclusions are drawn about the applicability of decision analysis for forecasting.     

Indoxyl derivatives of drug metabolites

Summary Indoxyl derivatives were detected as minor products among the urinary metabolites of two trial drugs, a benzodiazepine (GP 55 129) and a benzophenone (CGP 11 952). Their structures were elucidated by NMR and mass spectroscopy. Presumably, metabolites containing potential aldehyde functions react spontaneously with endogenous indoxyl. Such derivatives have not hitherto been encountered in drug metabolism.     

芦岭矿采空区煤炭自燃发火与开采技术关系的试验研究

采用了包括多点热电偶测定采空区遗煤温度、应用六氟化硫气体示踪和测定漏风压差等综合技术手段研究分析了漏风分布规律。结果发现,遗煤温度变化受漏风温度和漏风强度影响较大;停采线漏风的量及漏风时间受主要进、回风道的布置以及采掘接替安排的影响。由于采用无煤柱开采技术,三个相邻阶段的采空区之间连通,存在漏风,最后又从开采技术上提出了防火措施。     

The melatonin rhythm: both a clock and a calendar

The paper briefly reviews the data which shows that the circadian production and secretion of melatonin by the pineal gland can impart both daily, i.e., clock, and seasonal, i.e., calendar, information to the organism. The paper summarizes the 3 patterns of nocturnal melatonin production that have been described. Clearly, regardless of the pattern of nocturnal melatonin production a particular species normally displays, the duration of nightime elevated melatonin is proportional to the duration of the night length. Since daylength under natural conditions changes daily the melatonin rhythm, which adjusts to the photoperiod sends time of year information to the organism. The melatonin receptors which subserve the clock message sent by the pineal gland in the form of a melatonin cycle may reside in the biological clock itself, namely, the suprachiasmatic nuclei (SCN). The melatonin receptors that mediate seasonal changes in reproductive physiology are presumably those that are located on the pars tuberalis cells of the anterior pituitary gland. Besides these receptors which likely mediate clock and calendar information, melatonin receptors have been described in other organs. Interestingly, the distribution of melatonin receptors is highly species-specific. Whereas the clock and calendar information that the melatonin cycle imparts to the organism relies on cell membrane receptors, a fact that is of some interest considering the high lipophilicity of melatonin, recent studies indicate that other functions of melatonin may require no receptor whatsoever.     

高原鼠兔体重生长动态数学模型之再探讨

本文用麦夸算法构造高原鼠兔体重生长的Logistic和Compertz曲线模型,其结果表明:Logistic曲线比Gompertz曲线更优化,Logistic模型比逻辑斯谛-指要饱和模型的精确度更高.     

指纹识别技术在暂住人口身份证管理系统中的应用

随着计算机技术应用的普及和指纹识别技术的日益完善,现行的暂住人口身份证管理系统已逐步呈现出许多缺点和弊端.为解决近年来出现的诸多问题,使用本文提出的指纹IC卡暂住人口身份证管理系统,可以使被查者与本人身份完全一致,能够强化暂住人口的管理.