城市污泥好氧发酵菌种——乳酸菌的初步筛选

通过从乳酪等富含乳酸菌的天然物质中分离纯化乳酸菌,以COD及除臭效果为主要指标进行筛选,得到来源于乳杆菌属和链球菌属的4种乳酸菌。水解实验表明,4种菌对淀粉、蛋白质和纤维素都没有明显的降解作用。1、2和4号菌对污泥COD有一定的去除作用,除臭实验表明筛选出的乳酸菌具有良好的除臭效果。所筛选出的乳酸菌可用于制备污泥好氧发酵的复合菌剂。     

Reconstructing convex bodies from random projected images

We consider the problem of reconstructing a convex body from samples of lower-dimensional projections, or shadows. Such problems have been studied using mean cross-sectional measures of convex sets. We develop new methods based upon inner and outer estimates of the convex body, for which rates of convergence are obtained. These asymptotic results for the inner and outer estimates are compared with each other as well as those based upon Cauchy's formula.     

时间序列在城市交通预测中的应用

在地铁的可行性报告中，客流量的预测是一个重要的组成部分。T市地铁可行性研究报告中关于客流量的预测方法，采用的是国际上目前通用的四阶段法〔‘一，」。但该方法需要大量的调查数据，存在着调查的时效性问题，而且涉及许多参数，增大了预测的难度。此外，还存在着预测的跨     

公司规模与信息披露的交易量反应

本研究以年报信息披露为事件,考察了交易量反应的公司规模效应。我们的统计分析和统计检验结果表明,与国外发达市场一样,我国股票市场对信息披露不仅在反应大小上与公司规模负相关,而且在持久性上也与公司规模负相关。这意味着市场对不同规模公司的信息披露反应是不相同的,小公司的信息披露含量高于大公司。     

中国股票市场价量关系研究——基于沪市日数据的分位回归分析

股市价量关系研究具有重要意义。用传统方法考察变量间的"平均"价量关系,经常是高估或低估真实的价量关系。而采用分位回归方法对沪市价量关系进行研究的结果表明,沪市收益率及收益率绝对量和交易量之间存在显著的价量关系。收益率与交易量存在显著的V型价量关系,且正向价量关系强于负向价量关系。收益率绝对量与交易量存在显著的正向关系,且价格波动越剧烈时价量关系越强。     

Theoretical and practical issues in purchasing power parities illustrated with reference to the 1993 Organization for Economic Co-operation and Development data

This paper deals first with some theoretical issues in purchasing power parities, including the definition of a generalized class of additive indices, which includes the standard Geary–Khamis and Iklé indices as special cases, and the definition of indicators of price and quantity structure which are independent of the particular units in which quantities are originally expressed. The paper then provides a comparative analysis of the results of applying these techniques to the 1993 Organization for Economic Co-operation and Development data and relates the results to underlying features of the price and expenditure data.     

The performance of diagnostic-robust generalized potentials for the identification of multiple high leverage points in linear regression

Leverage values are being used in regression diagnostics as measures of influential observations in the $X$-space. Detection of high leverage values is crucial because of their responsibility for misleading conclusion about the fitting of a regression model, causing multicollinearity problems, masking and/or swamping of outliers, etc. Much work has been done on the identification of single high leverage points and it is generally believed that the problem of detection of a single high leverage point has been largely resolved. But there is no general agreement among the statisticians about the detection of multiple high leverage points. When a group of high leverage points is present in a data set, mainly because of the masking and/or swamping effects the commonly used diagnostic methods fail to identify them correctly. On the other hand, the robust alternative methods can identify the high leverage points correctly but they have a tendency to identify too many low leverage points to be points of high leverages which is not also desired. An attempt has been made to make a compromise between these two approaches. We propose an adaptive method where the suspected high leverage points are identified by robust methods and then the low leverage points (if any) are put back into the estimation data set after diagnostic checking. The usefulness of our newly proposed method for the detection of multiple high leverage points is studied by some well-known data sets and Monte Carlo simulations.     

呼和浩特市新城西街交叉路口立交渠化的研究

呼和浩特市新城区内蒙古博物馆前的三角地带（以下简称“西街口”）是由五条城市主干道组成的不规则型复合交叉，不同方向的车流在此处汇合，大量自行车流的存在，致使该处行车状况日趋恶化，行车速度低，行人过街不安全，交通事故时有发生。本文通过对该地区现状交通运行情况的调查和分析，提出了运用道路立体交叉改造方法改善西街口交通运输现状的设想，并提出了三个道路立体交叉渠化的改造方案，为各级领导决策提供科学的参考依据。     

合成药物对微生物代谢抑制作用的量热法研究

本文研究了细菌在合成药物抑制作用下的代谢过程的热功率_时间曲线,按指数生长模式根据曲线计算出了在给定条件下的生长速率常数,并得到速率常数与药物浓度间的关系,确定了最佳用药量.     

楠木胸径—材积相关方程初步研究

应用样本解析法在四川林校实习林场收集了 95株楠木材料 ,整理出 1412组样本数据。采用一元材积方程研究楠木胸径与材积之间的相关关系 ,结果表明楠木最优胸径—材积相关方程为 :V=0 .0 0 650 790 4 - 0 .0 0 4 0 63916d+0 .0 0 0 859373d2 。在此基础上编制了四川林校实习林场楠木一元立木材积表 ,经检验 ,能在该林场使用 ,为楠木林分蓄积量测定等提供了依据。