应用灰色关联度分析法评价毛竹种源的研究

应用灰色关联度分析法,对毛竹9个种源10个测试指标进行了量化评估,通过各种源加权关联度的比较,较为全面、客观地评价了各种源在不同经营目标上的优劣,为确定适宜推广的种源提供理论依据。     

办公自动化对文书和文书工作的影响

办公自动化在全社会各行各业的应用已日益广泛深入 ,它给各企事业单位固有的文书、文书工作带来很大的影响 ,对长期以来的文书、档案工作机制形成巨大的冲击     

大气阻尼对卫星运动的摄动研究

本文构造了一个大气密度模型,给出了卫星在大气阻尼作用下的摄动方程及计算近地卫星的实用公式。     

聚焦口径轴向电磁能的研究

对均匀振幅，凹冰面相位分布的圆口径天线和矩形口径天线的轴向辐射场进行研究、绘出了不同口径尺寸和焦距下的电磁能分布曲线。研究表明：电磁能可以聚焦在菲涅耳区或近区，口径增大时聚焦强度迅速提高，长距离的电磁能聚焦必须进行大口径天线的研究和应用。     

对荆州地区农村学校体育管理的研究

本文对荆州地区农村中小学体育管理的现状进行了问卷调查，结果表明：荆州地区农村中小学体育管理的现状出现两级分化的局面，地区差异性较大。一方面，大多数学校体育管理的组织领导体制是健全的，亦能行使其职能，各项体育常规管理工作也基本上能落实；但另一方面，还有相当一部分学校体育管理工作处于无序状态，学校的各项体育工作带有较大的盲目性和随意性。     

Monitoring Nonlinear Profiles with Random Effects by Nonparametric Regression

The monitoring of process/product profiles is presently a growing and promising area of research in statistical process control. This study is aimed at developing monitoring schemes for nonlinear profiles with random effects. We utilize the technique of principal components analysis to analyze the covariance structure of the profiles and propose monitoring schemes based on principal component (PC) scores. The number of the PC scores used in constructing control charts is crucial to the detecting power. In the Phase I analysis of historical data, due to the dependency of the PC-scores, we adopt the usual Hotelling T ² chart to check the stability. For Phase II monitoring, we study individual PC-score control charts, a combined chart scheme that combines all the PC-score charts, and a T ² chart. Although an individual PC-score chart may be perfect for monitoring a particular mode of variation, a chart that can detect general shifts, such as the T ² chart and the combined chart scheme, is more feasible in practice. The performances of the schemes under study are evaluated in terms of the average run length.     

中心城区遗产型城市广场的使用后评价研究——以广州陈家祠岭南文化广场为例

城市广场是城市公共游憩空间的重要组成部分。在城市文化旅游日益发展的背景下,中心城区遗产型广场这一特殊的游憩空间既要满足本地市民的游憩需求,又要迎合城市旅游开发与城市形象建设,本研究以广州陈家祠岭南文化广场为例,通过对其进行使用后评价(POE)研究,表明陈家祠文化广场的规划和管理由于更多地是服务于外地游客,因此在空间设计和使用上排斥了很多本土化的休闲活动,既不能满足本地居民强烈的休闲需求,也不能让游客体验到遗产型城市广场的文化性。文章最后对此类城市广场的规划和管理提出了建议。     

Online or Offline? Nonprofits’ Choice and Use of Social Media in Hong Kong

VOLUNTAS: International Journal of Voluntary and Nonprofit Organizations - Nonprofits are strategically using social media to disseminate information, engage with community, and mobilize...     

Change point detection for COVID-19 excess deaths in Belgium

Journal of Population Research - Emerging at the end of 2019, COVID-19 has become a public health threat to people worldwide. Apart from deaths with a positive COVID-19 test, many others have died...     

Can the birth quantity be known one year earlier?]

In order to carry out the population control policy, efforts are needed to control pregancies and births. Studies show that 3 types of people may deliver babies next year: 1) those who are married at the end of the current year but have not become pregnant, 2) those who have 1 child at the present time and plan to have an additional child for special reasons, and 3) those who may get married during the 1st season of the coming year. Persons from the 1st 2 categories are easy to calculate or estimate. Persons from the 3rd category represent the core in predicting the birthrate for the coming year. Marriage ages and the distribution of dates for marriage are the 2 major sources of information for estimating the total number of persons who belong to the 3rd category. In the 1st step, we need to figure the ratio between the number of marriages in the 1st season and the total marriages for the whole year. Based upon available data for the past 3 years, a formula can be used to calculate this ratio. The marriage numbers for the 1st season of 1982 multiplied by the above percentage will be the possible number of marriages for 1982. Then, the possible number of births can be calculated by taking the birth ratio multiplied by possible marriages for 1982. Using the same method, the possible birth numbers for 1983 can be calculated. The above information shows that the total predicted births for 1983 includes 3 elements: 1) the number of those who aare married but not pregant and plan to give birth in 1983, 2) the number of those who received special permission to have a 2nd child in 1983, and 3) the number of those who may get married in 1982 and 1983 and who may give birth in 1983.