植物高活性剂对三个品种龙眼的影响研究

应用植物高活性剂10mg·L^-1、5mg·L^-1、2．5mg·L^-1和1．25mg·L^-1对储良、古山和石硖品种龙眼进行试验,结果表明：（1）平均单果重比对照提高15．28％～23．85％、20．03％～36．47％和32．94％～45．10％;（2）果实的可溶性固形物比对照提高4．74％～15．01％、-15．18％～1．92％和-3．95％～13．16％;（3）果实的裂果率比对照降低了59．26％-100％、81．12％～100％和97．24％～98．90％,植物高活性剂防裂果效果显著;（4）应用植物高活性剂可显著提高龙眼产量,改善品质,提高果实商品率．     

中国居民低碳意识与经济增长关系的省域差异分析

利用环境库兹涅茨曲线(Environmental Kuznets Curve,EKC)模型对中国30个省市的居民生活能源消费和经济增长之间的关系进行分析,以此研究不同省市的居民低碳意识现状与发展趋势,通过引入居民年龄结构效应、收入水平效应因素,扩展了对数平均迪氏指数分解方法(LMDI)模型,并对居民生活能源消费进行了分解。研究结果表明:30个省市中,12个省市的EKC曲线呈现“倒U型”,7个省市的EKC曲线呈现“U型”,10个省市的EKC曲线是斜率为正数的直线,宁夏回族自治区不存在EKC曲线;经济发达是居民低碳意识较强的必要条件却不是充分条件;收入水平效应对居民生活能源消费增长的贡献最大,而居民年龄结构效应的贡献接近于零。     

以低碳为抓手建设生态体育场馆

根据体育场馆低碳和碳素循环原理,构建低碳生态体育场馆的碳平衡模型,应努力探索体育场馆建筑材料的低碳使用、可再生能源的开发利用、石化能源的高效运用、体育场馆的低碳绿化等生态体育场馆的低碳发展路径。     

智慧城市的理论与实践研究

城市的发展不仅依赖于物质性资源,还日益依赖于信息与知识资源所产生的"智慧",智慧城市信息畅通、知识立市、聚集智慧。智慧城市是继信息化城市、数字城市之后的城市未来发展新理念。国内外以感知化、互联互通化和智能化为基本特征的智慧城市建设涉及到城市交通、智慧电网、智慧政府、智慧建筑、智慧医疗等领域,一些城市通过因地制宜、梯次推进的实践,取得了较好智慧城市建设实效。     

高倍增力离心式离合器的工作原理与设计计算

介绍了两种采用高倍增力机构的离心式离合器—铰杆增力离心式离合器和斜楔增力离心式离合器,说明了其工作原理,给出了其输出力和输出转矩、接合角速度和接合转速、额定角速度和额定转速、弹簧最大工作载荷的计算公式。高倍增力离心式离合器结构紧凑,输出转矩的能力显著提高     

等重码构建的多脉冲位置调制UWB通信系统

在已有的单脉冲位置调制的基础上,利用等重码构建了一种多脉冲位置调制的UWB跳时调制方案;并对其AWGN下的信道容量、误码率等性能指标进行了理论分析。数值结果表明,在满足一定的条件下,MPPM能以较低的接收机复杂度在数据容量、误码率等指标上获得比相应的脉冲位置调制及脉冲幅度调制更高的性能,可以作为UWB高速通信应用的一个很好的备选调制方案。     

Modelling period fertility: Schooling and intervals following a birth in Eastern Africa

We describe a regression-based approach to the modelling of age-, order-, and duration-specific period fertility, using retrospective survey data. The approach produces results that are free of selection biases and can be used to study differential fertility. It is applied to Demographic and Health Survey data for Ethiopia, Kenya, Tanzania, and Zimbabwe to investigate differential trends in fertility by education. Parity progression fell and the intervals following each birth lengthened between the 1970s and 2000s in all four countries. Fertility fell most among women with secondary education. In contrast to other world regions, postponement of successive births for extended periods accounted for much of the initial drop in fertility in these African countries. However, family size limitation by women with secondary education in Ethiopia and Kenya and longer birth spacing in Zimbabwe also played significant roles. Thus, birth control is being adopted in Eastern Africa in response to diverse changes in fertility preferences.     

New evidence about effects of reproductive variables on child mortality in sub-Saharan Africa

There is still considerable uncertainty about how reproductive factors affect child mortality. This study, based on Demographic and Health Survey data from 28 countries in sub-Saharan Africa, shows that mortality is highest for firstborn children with very young mothers. Other children with young mothers, or of high birth order, also experience high mortality. Net of maternal age and birth order, a short preceding birth interval is associated with above average mortality. These patterns change, however, if time-invariant unobserved mother-level characteristics of importance for both mortality and fertility are controlled for in a multilevel–multiprocess model. Most importantly, there are smaller advantages associated with longer birth intervals and being older at first birth. The implications of alternative reproductive ‘strategies’ are discussed, taking into account that if the mother is older at birth, the child will also be born in a later calendar year, when mortality may be lower.     

Using the Theory of Planned Behaviour to Understand Motivation to Register Births in Lombok,Indonesia

Despite government interest in promoting birth registration, more than a third of Indonesian children do not have a birth certificate, affecting the realisation of both their human and citizen rights. While barriers to registering children's births in Indonesia have been assessed, there is limited research on how communities perceive the importance of having a birth certificate. This study used focus group discussions to explore parental motivations around birth registration. The results of a thematic analysis found that perceived use of birth certificates, perceived control over the application process and social norms related to certificate ownership affect the intention to apply.     

Using Bayesian graphical models to model biases in observational studies and to combine multiple sources of data: application to low birth weight and water disinfection by-products

Summary.  Data in the social, behavioural and health sciences frequently come from observational studies instead of controlled experiments. In addition to random errors, observational data typically contain additional sources of uncertainty such as missing values, unmeasured confounders and selection biases. Also, the research question is often different from that which a particular source of data was designed to answer, and so not all relevant variables are measured. As a result, multiple sources of data are often necessary to identify the biases and to inform about different aspects of the research question. Bayesian graphical models provide a coherent way to connect a series of local submodels, based on different data sets, into a global unified analysis. We present a unified modelling framework that will account for multiple biases simultaneously and give more accurate parameter estimates than standard approaches. We illustrate our approach by analysing data from a study of water disinfection by-products and adverse birth outcomes in the UK.