Men wielding the plough: Changing patterns of production and reproduction among the Balanta of Guinea‐Bissau

This paper is centred on the fast‐track changes occurring among the Balanta of Guinea‐Bissau—at present, the only ethnic group in West Africa still able to produce a mangrove swamp rice surplus with a manual plough—in their traditionally intensive farming system and their social organization, and on the consequences that these changes have had for gender relations, especially with regard to married women's spatial mobility, sexual and economic independence, and access to land, labour, and capital. In doing so, the paper contributes to old debates about the relationship between means of production and gendered power dynamics in contexts where African societies based on domestic modes of production progressively embrace the market economy. The Balanta case offers a new layer of complexity to this debate due to their long‐term resistance to westernization and market integration, their particular conjugal relations, and the paradoxical way in which women have been losing their traditional rights.     

利用主客观集成赋权法的多目标威胁评估

在利用逼近于理想解的排序法(Technique for Order Preference by Similarity to an Ideal Solution,TOPSIS)进行多目标威胁评估时，针对如何获取合理的目标威胁评估因子的权重比，提出了一种主客观集成赋权方法。该方法首先利用主观赋权法和客观赋权法获取两组权重值；然后，通过构造多目标规划模型，将两组权重值进行综合处理，得到更合理的权重值。仿真结果表明，相较于主观赋权法和客观赋权法，所提方法计算出的威胁评估因子的权重值，在用TOPSIS法计算目标威胁评估时，能够得到更加合理、有效的评估结果。     

基于二叉树模型的农业可转债定价研究——以天康转债为例

以天康转债为例,通过构建二叉树模型对其进行定价研究,可以得到2020年4月3日天康转债的理论价格为180.69元,当日实际价格为176.88元,两者相差不大。为了更加直观地显示运用二叉树模型计算出的理论价格与实际价格的偏差,形成30个交易日的理论价格与实际价格对比图,研究表明二叉树法得出的理论价格与实际价格基本一致。将二叉树定价模型运用到其他农业可转债中,除宏辉转债外,其他可转债理论价格与实际价格偏差不大。     

An exploratory study of the influences that compromise the sun protection of young adults

This paper reports on an exploratory research project designed to gain a deeper understanding of the influences on ultraviolet radiation (UVR) behaviours among high‐risk young adults to determine what compromises the adoption of protection measures for this group. A dual approach using focus groups and the Zaltman Metaphor Elicitation Technique was used to provide personal narratives related to UVR behaviour for tertiary education students. Results from both ‘conversations’ were content‐analysed using an iterative ‘bootstrapping’ technique to identify key themes and issues. This exploratory research identified a number of key themes including effect on mood, influence of culture, the value of tans, unrealistic optimism, risk‐orientation, and the role of experience. This group felt that they not been targeted effectively by public health campaigns and did not fully understand the dangers of high‐risk UVR behaviours. Although a number of previous studies have investigated the relationship between knowledge and behaviour, and largely concluded that increases in knowledge do not lead to increases in adoption of protection practices, the preliminary findings of this study reveal that the knowledge and perceived self efficacy of protective practices is extremely high, what is lacking is the perceived threat and thus the motivations to adopt such behaviours. The conclusions drawn from this research indicate that there are a variety of important influencing factors that compromise UVR behaviours, in particular, the lack of perceived seriousness and severity towards long term consequences such as skin cancer. The recommendation to address the imbalance of ‘perceived threat’ and ‘outcome expectations’ is to focus on increasing knowledge of skin cancer, particularly susceptibility to skin cancer and the severity of the condition.     

Effect of Cross-Border E-Business Policy on the Export Trade of an Emerging Market: A Dynamic Study of Institutional Support to Cross-Border E-Business at Chinese Pilot Cities

Policies to offer institutional support to cross-border E-business are processed in the development of export at emerging markets. This research estimates the effect of institutional support to cross-border E-business on export trade in an emerging market by a difference-in-difference model. It is found that the institutional support to cross-border E-business at the pilot cities had a positive effect on export trade. Further, a decision tree of predictions to export is developed, based on the cross-border E-business policy and regional economic factors shown to have effect on export, and the complex network of interconnections across the cities in different conditions is revealed. The estimation of probability for export increase based on the effect of cross-border E-business policy is further performed by Bayesian model. This research can be helpful to policy makers and business administrators in understanding the effect of cross-border E-business policies on export at emerging markets.     

期权定价数值分析模型的计算机程序实现探讨

由于复杂的、多维度期权的应用越来越广泛,运用数值分析方法对其进行定价分析已成为一个必不可少的手段。然而,数值分析方法自身运算的复杂性,决定了其手工运算的成本高,因此充分发挥计算机的"精确、快速"优势是实现期权定价数值分析模型的一个必然趋势。基于计算机编程语言技术,研究了Java对数值方法的实现,及Java语言在期权定价中的应用;并通过java语言本身的语法规则、内嵌函数等,对期权定价的二叉树模型和蒙特卡罗模拟方法进行有效的实现。研究结果表明,运用java语言可以较快、较好地解决规则期权与奇异期权的定价问题。     

一种层次化的内部威胁态势评估模型

文章针对内部威胁的特点,提出了一种层次化内部威胁态势评估模型及其相应计算方法。该方法在威胁频率及威胁严重性的统计分析基础之上,利用模块和主机自身的重要性因子进行加权,计算内部网络系统内模块、主机以及整个网络系统的威胁指数,进而评估分析内部威胁态势。     

某型液压系统状态监测方法研究

某型发射装置是某型导弹发射车上的关键部件,承担着调平、撤收、起竖、回平、锁定等功能。其可靠性水平直接影响着整个武器系统作战效能的发挥,以其中的起竖系统为例进行故障树的构建和最小割集的求解,对压力和温度监测方案进行探讨,设计出其关键部件的状态监测方案。     

有限责任公司僵局探略

公司僵局主要发生在有限责任公司。根据不同的原因,公司僵局有不同的分类,但其主要原因在于有限责任公司的公司决策和管理实施的资本多数表决制、有限责任公司典型的人合性特征,以及法律规定的有限责任公司股东退出机制不完善。有限责任公司僵局的存在,不仅危害公司和股东的利益,还会对相关利益人的利益造成危害。     

良种基地的“公益林+”模式构建——以浙江姥山林木良种基地为例

传统意义上的林木良种基地所承担的功能是良种繁育和种质资源收集保存,是公益林的重要组成部分。林木良种的生态属性得以进一步发挥与延伸,需要走生态产业化的路子。建立与科普教育、林下经济、生态旅游以及公益性林木认养、文化研学相融合的"公益林+"创新模式,体现森林的综合价值,实现包括人与自然和谐相处在内的森林生态系统的良性循环。