Status Analysis and Trend Prediction for the Labor Costs of Chinese Construction Industry
Chinese huge low-cost labor force provided motive power for the development of construction industry in the past decades. However, Chinese labor costs soar quickly in recent years, which bring pressures to construction enterprises. In order to analyze the problems of rising labor costs of Chinese construction industry in depth, a questionnaire survey is conducted among construction workers and project managers. According to the result of the investigation and statistical data, the rising actuality and influence factors of labor costs in Chinese construction industry are analyzed comprehensively. Then the medium and long term prediction of labor cost is carried out by using GM (1, 1) grey model. The results show that the average pay of Chinese construction workers rose quickly over the past 5 years. Changes of supply–demand relation of labor force, soaring prices and the rapid economic development, and other aspects are the reasons causing the labor costs increase. The average daily pay of Chinese construction workers will keep rising in coming years, and will achieve 337 RMB yuan by 2020. The research results present valuable reference basis for construction enterprises to grasp the development trend of labor costs and takes steps to address the labor cost pressures.
A different approach to construction labour in Turkey: comparative productivity analysis
This paper reports an investigation of construction labour productivity described as numerical values. First, a general knowledge is given about labour productivity. Then, the system which is the source of the man hour values in Turkey, is introduced and criticism of it is carried out. To this aim, labour productivity rates of 82 work items were obtained by a questionnaire applied to planning engineers, site managers, sub-contractors, architects and consultants of 32 large-scale construction firms in Turkey. The results were evaluated by one sample t-test, and hence, today's situation of the construction sector in Turkey on labour productivity was displayed.
Clozapine derived 2,3-dihydro-1H-1,4- and 1,5-benzodiazepines with D4 receptor selectivity: synthesis and biological testing.
Novel 4-arylpiperazin-1-yl-substituted 2,3-dihydro-1H-1,4- and 1H-1,5-benzodiazepines and their aza-analogues were synthesized as debenzoclozapine derivatives for evaluation as potential D4-ligands. While Ki values of some of the title compounds came within the range of clozapine, they showed an impressively greater selectivity over other dopamine receptor subtypes, especially D2. For the most promising compounds, intrinsic activity and binding properties to serotonin 5-HT1A and 5-HT2 were also determined.