An empirical test of the relative frequency of bipolar reduction in Beds VI,V, and III at Mumba Rockshelter,Tanzania: implications for the East African Middle to Late Stone Age transition

Mumba Rockshelter, Tanzania, is the only East African site spanning a continuous record of more than 100,000 years, including the Middle Stone Age (MSA) to Late Stone Age (LSA) Transition. Rather than examine the presence or absence of traditional markers of “behavioral modernity”, we have endeavored here to respond to the calls of Shea (2011) and Basell (2008) by examining the proportional similarity of a trait present throughout the MSA–LSA sequence at Mumba Rockshelter: the bipolar technique of lithic reduction. We use a quantified, experimentally derived proxy to track the relative amount of bipolar percussion among Mumba's Beds VI, V, and III, namely, waste shatter. Our examination of Mehlman's previously unanalyzed collections from Mumba demonstrates that in terms of bipolar production Bed V is statistically indistinguishable from the Late Stone Age (LSA) Bed III, but significantly different from the Middle Stone Age (MSA) Bed VI. Given that Bed V dates to 56.9 ± 4.8 − 49.1 ± 4.3 ka cal BP, this result is consistent with other evidence that the origins of the LSA in East Africa began well before 40 kya, and that Mumba Bed V represents one of the earliest manifestations of the LSA in East Africa. We conclude with a discussion of factors that may have influenced the increased dependence of bipolar production at the site.     

SPACE–TIME MEASURES OF DEMAND FOR SERVICE: BRIDGING LOCATION MODELLING AND ACCESSIBILITY STUDIES THROUGH A TIME‐GEOGRAPHIC FRAMEWORK

Demand for service in location modelling is often evaluated based on the spatial proximity of fixed and static reference locations of demand (e.g. home) to a facility, which ignores person‐specific activity–travel patterns and the temporal changes in demand for service throughout the day. To address these limitations, this study draws upon recent developments in space–time measures of individual accessibility to explore the spatial and temporal structures of demand by considering individuals' space–time constraints and impact of existing urban structures. Based on a time‐geographic framework, eight space–time demand measures were developed and compared with three conventional location‐based demand measures for 12 hospitals through an empirical study conducted in Columbus, Ohio. The results show that geographic proximity between clients' home and facilities may not be an effective indicator for service demand, and conventional demand measures tend to underestimate potential demand for service in most situations. The study concludes that space–time demand measures that take into account people's activity‐travel patterns in space–time would lead to better estimation of demand for service in most cases.     

Toolstone constraints on knapping skill: Levallois reduction with two different raw materials

Lithic raw material constraints are widely assumed to be a determining factor of flaked stone tool morphology, but this assumption remains largely untested. We conducted a controlled experiment to determine whether a knapper’s growing replication skills would be hindered if the toolstone used was switched from large flakes of an easily worked chert to nodules of less tractable one. Two batches of Preferential Levallois cores were knapped, an earlier series made from standardised large flakes of sediments dominated by chalcedonic quartz followed by a more challenging one using variably-shaped, cortical nodules of microcrystaline quartz that varies in the completeness of quartz replacement of calcite and dolomite. Skill level markers were designed to measure the knapper’s ability to achieve a series of set goals. These were quantified and subjected to statistical testing. In all but one test, significant increases in skill could be detected from the earlier to the later batch of reductions, despite the drop in toolstone quality. Significant improvements in the consistency of the knapper’s output could also be detected. However, the switch to a more challenging, nodular chert did require extra shaping, which resulted in more waste. This masked visible progress towards producing a less costly core. Overall, our results do not support the assumed primacy of toolstone constraints over other factors in influencing the morphology of flaked stone tools.     

“借口”:中国城市资本高度集聚的政治经济学分析框架

面对改革开放以来中国快速城市化现象,本文从中国投资拉动的经济增长模式出发,发现中国城市存在着高度积累,特别是行政级别高的城市持续投资增长的现象,在分析投资、投资效率与大型事件关系的基础上,提出了官员晋升竞标赛和财政分权预算约束条件下的制度机会主义行为假设,认为大型事件不过是政府构建的一个有利于在城市体系下,通过打破传统的政府预算约束,实现资本高度集中促进经济持续增长的制度机会主义行为。"借口"模式旨在揭示大型事件现象背后的政治与经济激励,并以2010年广州举办亚运会为例,按政府构建—突破约束—官员晋升的结构,分析了广州市政府构建全社会共识,举办亚运会带来巨额投资促进城市发展实现政治与经济激励的事实,为"借口"模式提供了实证的案例。最后,对"借口"模式的未来趋势进行了探讨。     

Amplitudes of orbitally induced climatic cycles and patterns of hominin speciation

Palaeoanthropologists and archaeologists have long invoked climate change to explain aspects of human evolution. Collection of new climatic and environmental data combined with new fossil discoveries and methodological improvements continue to make exploration of this link a vital endeavour in studying human evolution. The current study employs a global climatic dataset and a rigorously compiled catalogue of hominin first and last appearance dates to test the effects of changes in temperature on hominin speciation and extinction. Through the use of wavelet analysis and bandpass filters the eccentricity, obliquity, and precession components of the studied climatic record are extracted and tested independently for associations with patterns of speciation and extinction. Results suggest that all three components may play a role in speciation events, but that only the obliquity cycle shows a statistically significant relationship with extinction events. It is suggested that, whilst climatic factors could contribute to the appearance of new hominin species, subsequent competition between these species may lead to their extinction.     

Review of Different Pushover Analysis Methods Applied to Masonry Buildings and Comparison with Nonlinear Dynamic Analysis

This article presents the comparison among different nonlinear seismic analysis methods applied to masonry buildings, i.e., pushover analyses with invariant lateral force distributions, adaptive pushover analysis and nonlinear dynamic analysis. The study focuses on the influence of lateral force distribution on the results of the pushover analysis. Two simple benchmark case studies are considered for the purpose of the research, i.e., a four-wall masonry building prototype without floor rigid diaphragms and a two-wall system with a cross-vault. The comparative study offers a useful review of pushover analysis methods for masonry structures and shows advantages and possible limitations of each approach.     

环境约束下陕西城镇化效率的区域差异及空间格局

本文运用因子分析法构建了陕西省的综合环境因子指数,将其引入到DEA以及Malmquist指数模型中,动态测度了2003-2014年间陕西及其各地市在有无环境约束下的城镇化发展效率的差异,并对各地市的城镇化效率进行了排名。研究结果表明:陕西城镇化的技术效率在有无环境约束下均没有达到有效状态;在加入环境约束后,技术效率均值波动性更大,呈"W"形,且下行趋势更加明显;传统城镇化发展的"规模不经济"效应,正在凸显出来,部分地市呈现出"规模效率"与"技术效率"均下降的状态。论文最后给出了提高陕西城镇化效率的政策建议。     

The Pleistocene Peopling of the North: Paleolithic Milestones and Thresholds Horizons in Northern Eurasia: Part I: Lower Paleolithic Antecedents

Human occupation of northern Eurasia high latitudes entailed coping with severe bioclimatic circumstances and Ice Age cycle fluctuations. Resolving this “adaptability paradox” required depending on cultural, rather than biological means. Paleolithic evidence indicates culture historical developments of considerable time depth, long-term adaptive stages, and thresholds in the “peopling of the North.” It began with Lower Paleolithic populations expanding into temperate and continental Eurasia, becoming fully actualized during the Middle and Upper Paleolithic. The Middle Paleolithic formative stage constituted a human biogeographic realm overlapping significantly with the Mammoth-Steppe Biome faunal complex. Part I identifies issues, time perspectivism, culture, foraging adaptation, and human biogeography concepts. Lower Paleolithic occurrences, initial occupation episodes are surveyed and discussed.     

从法律制度追寻社会法治

法律作为一种具有国家强制力的调整社会关系的手段,有自己的调整领域。法制有可能偏向惩罚,讲法制就意味着强化对违法行为的惩罚和追究。但这不能涵盖法律的全部特征和作用。法治是一种理性的办事原则,侧重于法律的遵守和执行,与传统的强调法律的执行不同,其基本原则是要求所有人都依法而行,没有人在法律之上,没有人能随意突破法律。同时还意味着社会活动的形式正当原则,使不同的人遵循共同的行为规则与程序。     

Can conditional cash transfers promote delayed childbearing? Evidence from the ‘Second Honeymoon Package’ in rural Maharashtra,India

In 2007 the District Health Services in Satara District, Maharashtra, India, undertook an innovative programme, ‘the Second Honeymoon Package’ (SHP), which aimed to reduce the rate of population growth by offering conditional cash transfers (CCTs) to newly married couples who agreed to postpone their first birth by two or three years. The approach differed from India's traditional family planning programme, based mainly on female sterilisation, by promoting ‘non-terminal’ contraceptive methods, such as condoms and pills. The SHP ended prematurely in 2010 without being fully evaluated, leaving unanswered the question of its impact and potential for scale-up.

This paper addresses this question by investigating the perceptions and experiences women and couples who participated in the programme, as well as the views of local health staff. We use quantitative data from a 2010 survey of 1355 SHP participants, in which the third author was involved, and new qualitative data from a total of 26 programme staff and participants, collected by the first two authors in 2015. Participants’ perceptions of the programme indicate that the SHP had many positive attributes, despite some major challenges. We conclude with recommendations for improving and scaling up programmes of this kind in India and elsewhere.