Grammar Schools,a Policy of Social Mobility and Selection—Why?

Initially, four plausible reasons for introducing selection in secondary education are examined, three of which are irrelevant to contemporary debates about expanding grammar‐school education. These are: first, to ration education in less advanced economies; second, to increase the supply of skilled labour within an expanded national elite; third, as part of a ‘segmented’ system of education. A fourth—increasing upward social mobility—is open to two objections: first, the May government's proposals are so limited as to have little likely impact on mobility and, second, upward mobility in the twentieth century was possible only because of structural change in the British labour market, and that will probably not continue in this century. Finally, it is argued that attempts to select the ‘best’ in any activity or skill are necessarily highly imperfect, and are far less accurate than testing who does and does not meet some minimum level of competence.     

地源热泵技术——一种节能环保的新型中央空调系统

介绍了地源热泵中央空调系统,着重说明它的节能与环保性,指出了地源热泵技术应用中应注意的问题,并结合工程实例加以阐述.     

Rethinking the livret d’ouvriers: time,space and ‘free’ labor in nineteenth century France

ABSTRACT

The paper analyses the control of labor mobility through the livret d’ouvriers (1803–1890): a sort of internal passport aiming to subordinate workers’ circulation to the abidance of contract terms. The effective enforcement of livrets had a limited scope for various reasons. Nevertheless, those same difficulties offer a privileged perspective from which to analyze the shifting meanings of freedom and coercion in relation to labor poverty. The politics of identification show that it has been necessary to politically act on the spatial organization of productive processes in order to control labor through time, reacting to workers’ mobility as a specific form of collective bargaining. Through the lens of labor defection we see the emergence of a form of integration deriving from the cash nexus, the vehicle of market concurrence. Such integration calls for a form of control which cannot be subsumed within common law and that is rather axed on the modulation of market pressure – which we analyze through the 1850 debate over advance pay. From this perspective, the issues of breach of contract, police identification and debt insolvency allow to rethink the notion of coercion beyond its penal criminalization and, consequently, to frame the continuities between the police des manufactures, and the modern welfare State.     

Commonwealth Student Exchange 1959-2019 – Planned and Unplanned

ABSTRACT

Higher education, and international student mobility, have expanded in 60 years since the Commonwealth Education Conference of 1959. It established a Commonwealth Scholarship and Fellowship Plan which has funded and moved early-career scholars and mid-career fellows between Commonwealth member countries. It has done so in a context in which the number of students moving between Commonwealth countries has grown but this intra-Commonwealth movement has shrunk as a proportion of the total, just as the Commonwealth has lost its political and economic significance. The scholarship plan expanded up to the 1990s, with students travelling from virtually all Commonwealth countries, mainly but not entirely to Australia, Britain, Canada and New Zealand. From the 1990s the plan has shrunk with Australia and Canada ending their awards and Britain limiting them to developing countries. Its purpose has moved from one of promoting Commonwealth cohesion to one of supporting development within the south. Its history demonstrates the way in which changing political circumstances have driven student mobility and shaped its geography.     

Economic mobility trajectories of the Russian population： The experience of the last two decades

This paper is to study the economic mobility trajectories of the Russian population in the last two decades, each of which has brought about both negative shocks and broadening of the opportunity horizons for people＇s economic advancement. The information base of the research is provided by the data of the Russian Longitudinal Monitoring Survey （RLMS） for the period of 1994-2008. The investigated period Russia clearly falls into two sub-periods-the 1990s and the 2000s： The first one is characterized by sharp shifts towards impoverishment of the population and growth of economic inequality; the second one-by considerable masses of people overcoming poverty with a still high level of economic inequality. The results indicate the following The proportion of the adult population who have been chronically poor during the whole contemporary history of Russia proves to be twice as little as the proportion of those who have been “chronically non-poor”. However, both groups in total have not constituted the majority, since the majority have been migrating between the extremes of persistent well-being and ill-being during this period with the stream of those coming out of poverty prevailing in numbers.     

美国的收入流动性研究及启示

文章从代际收入流动、个人生命周期中的收入流动性以及低工资雇员的收入流动性三个方面,介绍了国外学者对美国收入流动性的分析.对美国收入流动性的研究表明,美国社会远不如人们所设想的那样具有流动性.收入流动性是考察收入不平等的动态视角之一,这一视角对我国的收入分配研究具有一定的借鉴意义.     

Upward mobility implications on the aspirant middle class in emerging economies

This article unearths the salient factors that trap the aspiring middle class in their progression towards a stable middle class in the City of Johannesburg, South Africa. The study utilises a quantitative case study design, drawing on a sample of 449 aspirants and 578 middle-class heads of households from the 2021 Gauteng City-Region Observatory Quality of Life Survey. A binary logistic regression model was used to analyse these salient factors (key determinants) and their impact on the social mobility of the aspirant middle class. Findings reveal a significant relationship between social mobility and education, racial inequality, asset ownership, access to economic opportunities and proximity to amenities. We suggest local government policies that positively influence the conditions of these determinants for sustained mobility of the aspirant middle class over time.     

Detection of explosives in hair using ion mobility spectrometry

Conventional explosives 2,4,6-trinitrotoluene (TNT), nitroglycerin (NG), and ethylene glycol dinitrate (EGDN) sorbed to hair can be directly detected by an ion mobility spectrometer (IMS) in E-mode (for explosives). Terrorist explosive, triacetone triperoxide (TATP), difficult to detect by IMS in E-mode, was detected in N-mode (for narcotics). Three modes of sample introduction to IMS vapor desorption unit were used: (i) placement of hair directly into the unit, (ii) swabbing of hair and placement of swabs (i.e., paper GE-IMS sample traps) into the unit, and (iii) acetonitrile extracts of hair positioned on sample traps and placed into the unit. TNT, NG, and EGDN were detected in E-mode by all three sample introduction methods. TATP could only be detected by the acetonitrile extraction method after exposure of the hair to vapor for 16 days because of lower sensitivity. With standard solutions, TATP detection in E-mode required about 10 times as much sample as EGDN (3.9 mug compared with 0.3 mug). IMS in N-mode detected TATP from hair by all three modes of sample introduction.     

论现代国际航空法的自由化趋势

自由化既是应然国际航空法的一种理念和价值取向,又越来越多地体现在实在国际航空法之中。具体而言,1944年《芝加哥公约》建立的双边法律体制实质上是一种贸易保护主义,从美英《百慕大协定》到美国自由式协定都增进了自由化内容,2007年美欧协议和中美协议体现了全面的自由化;从区域层面来看,欧盟与亚太地区航空法都展示了自由化势头;国际多边自由化仅在有限范围内得到发展,但航空联盟在实践中发展了多边自由化,ICAO也对多边自由化做出了重要贡献;WTO多边法律体制也开始调整航空运输,虽然目前的调整范围十分狭窄,但贸易评审机制保障了WTO航空立法自由化的向前发展。