‘A load too heavy’: Critical reflections on the child labor problem in Africa's small-scale mining sector

This paper provides an extended analysis of the child labor problem in the artisanal and small-scale mining (ASM) sector, focusing specifically on the situation in sub-Saharan Africa. In recent years, the issue of child labor in ASM has garnered significant attention from the International Labor Organization (ILO), which has been particularly active in raising public awareness of the problem; and, has proceeded to implement policies and collaborative project work aimed at curtailing children's participation in ASM activities in a number of African countries. The analysis concludes with a critical appraisal of an ILO project recently launched in the Talensi–Nabdam District in the Upper East Region of Ghana, which sheds light on how the child labor problem is being tackled in practice in ASM communities in sub-Saharan Africa.     

Feature significance in generalized additive models

This paper develops inference for the significance of features such as peaks and valleys observed in additive modeling through an extension of the SiZer-type methodology of Chaudhuri and Marron (1999) and Godtliebsen et al. (2002, 2004) to the case where the outcome is discrete. We consider the problem of determining the significance of features such as peaks or valleys in observed covariate effects both for the case of additive modeling where the main predictor of interest is univariate as well as the problem of studying the significance of features such as peaks, inclines, ridges and valleys when the main predictor of interest is geographical location. We work with low rank radial spline smoothers to allow to the handling of sparse designs and large sample sizes. Reducing the problem to a Generalised Linear Mixed Model (GLMM) framework enables derivation of simulation-based critical value approximations and guards against the problem of multiple inferences over a range of predictor values. Such a reduction also allows for easy adjustment for confounders including those which have an unknown or complex effect on the outcome. A simulation study indicates that our method has satisfactory power. Finally, we illustrate our methodology on several data sets.     

论中国CI设计的发展

中国企业要想成功导入CI战略，必须创造中国型的CI、走中国化的道路，这样才是正确的、科学的选择。     

尉犁地名和柔然源流考

“尉犁”(包括天山北麓的“于娄”、“于赖”)地名源于(J)yrgir部落之名。“柔然”(虫柔蠕,蠕蠕,芮芮,茹茹)、“於尼讙”、“预龙”、“诸洛固”等部落联合体(政权)或部落名是(J)yrgir的不同音译形式。汉宣帝时该部曾移居焉耆及尉犁等地。相对稳定的社会环境,为该部的发展奠定了基础。在汉地先进的铁制农具、兵器、相关的制度文化以及塔里木盆地土著印欧语居民文化的影响下,亦加快了其社会发展进程。这是该部在两汉以后能得以崛起的重要原因。柔然是突厥语族群中最早信仰佛教的部落,柔然汗国还使用汉语年号,表明该部虽远在西域,却受到了汉文化的深刻影响。     

一种基于冗余小波变换的DT网格运动估计和运动补偿方法

网格划分和网格顶点的运动估计是基于不规则网格的视频压缩技术的关键。为了进一步提高网格运动估计和运动补偿的效果,在综合比较现有冗余小波变换域运动估计方法和适用规则网格的EMRMC算法的基础上,提出了一种新的基于不规则网格的运动估计和运动补偿算法,即在冗余小波变换域提取特征点和运动潜在区,网格顶点的运动估计采用结合运动潜在区的在时域进行块匹配的运动估计和运动补偿方法,而运动补偿则通过三角形仿射变换完成。同时还给出了冗余小波变换域提取运动潜在区的计算模板。理论分析和实验结果表明,该算法在补偿效果方面较前两种方法得到了改进。     

GORE-TEX~与有机溶剂结合法在纺织品文物保护中的应用

部分纺织品文物在保护过程中不宜与水接触,或普通的保护方法不能满足实际操作的要求,因此需要寻找一种替代技术.本文介绍了采用微孔膜层压织物材料GORE-TEx@与有机溶剂结合法应用于纺织品文物保护的新型技术,并对GORE-TEx@材料及该新型技术的使用方案、应用方向和注意事项进行了总结.     

A BETA-OPTIMAL TEST OF THE EQUICORRELATION COEFFICIENT

This paper considers the problem of testing for nonzero values of the equicorrelation coefficient of a standard symmetric multivariate normal distribution. Recently, SenGupta (1987) proposed a locally best test. We construct a beta-optimal test and present selected one and five percent critical values. An empirical power comparison of SenGupta's test with two versions of the beta-optimal test and the power envelope shows the relative strengths of the three tests. It also allows us to assess and confirm Efron's (1975) rule of when to question the use of a locally best test, at least for this testing problem. On the basis of these results, we argue that the two beta-optimal tests can be considered as approximately uniformly most powerful tests, at least at the five percent significance level.     

Global Trade Models and Economic Policy Analyses: Relevance,Risks and Repercussions for Africa

Computable general equilibrium models are widely used for trade policy analyses and recommendations. There is, however, increasing discomfort with the use of these models, especially in Africa. This article demonstrates that the results of several such studies of the impact of trade reforms in Africa differ drastically in terms of both magnitude and direction, failing to take account of key features of African economies. It also outlines potential consequences of the misuse of CGE models for policy evaluation and suggests pitfalls to be avoided.     

conditions of goat kid ren

ture,and salting-out time on the purification efficiency were systematically analyzed.The results showed that ammonium sulfate was proved not to be suitable to precipitate rennet.But NaCl could be an optimum salting-out agent in the salting-out of goat kid rennet.The optimal condition for salting-out by NaCl was 55%-65% NaCl saturation,salting-out pH     

1-(2-苯并噻唑)-3-(4-硝基苯基)-三氮烯的合成及分析性能研究

报道了1-（2-苯并噻唑）－3-（4-硝基苯基）-三氮烯（BTNPT）的合成及性质．在TrionX－100存在下，B－R的缓冲碱性介质中，试剂与镉、汞、镍等离子具有高灵敏显色反应，表观摩尔吸光系数分别为2．20×105L·mol－1·cm－1、1．47×105L·mol－1·cm－1、1．00×105L．mol－1·cm－1．