城市消化:转移农村剩余劳力的重要出路——运城市泓芝驿镇四千劳力进军城市的调查

近年来,农村劳力的大量剩余同农民急切的致富要求所形成的矛盾日益尖锐。怎样化解这组矛盾,不仅广大农村群众关心,而且成了各级领导部门一个急待解决的重大课题。最近,我们在运城市泓芝驿镇调查,深切地感到这里有39％的农民进军大中城市从事以食品加工为主的服务业,使城市服务行业的需要同农村农民致富的需要得到了有机结合,成为当前解决农村剩余劳力和组织农民致富的一条重要出路。

城市污泥与锯末复配为基质对小麦种苗萌发生长作用初探

采用盆栽试验,以不同配比经消化的城市污泥、锯末作为栽培基质应用于小麦种苗萌发生长上。用发芽势、发芽率、发芽指数、活力指数、苗高和根长等指标对污泥和锯末复配的基质作用效果进行研究,结果表明,与对照组相比,配比中污泥含量为40%时,小麦种子萌发和种苗生长状态最好。

Quantitative study on the urban fresh water consumption since Chinese rapid urbanization

The development of urbanization has a close relationship with fresh water resources, especially in the rapid urbanization period. By analyzing the course of the urhanization development and the experience of international urbanization development, the paper confirms the starting time of the rapid urbanization. Based on the ecotogical theory; urban fresh water consumption is composed of three types： the direct, the indirect and the induced water consumption. And the paper constructs calculation model of the indirect and the induced water consumption. Using the related statistics data, the paper makes an empirical research on the changes of the amount and structure of water consumption. Then it discusses the correlation between the water consumption and the amount of urban population, and the result shows that the amount of the water consumption arid the urban population have a remarkable correlation with the exception of the amount of the indirect water consumption, and the curves fake on quadratic functian form. Last, from the urban fimction point of view; the paper anatomizes the cause of the urban water consumption changes.

The Pork Consumption Characteristics of Chinese Urban Residents： The Outlook for 2020

China has the highest pork consumption in the world. As incomes increase and the urbanization process accelerates, the consumption of pork by Chinese residents will continue to grow. This paper studies the proportion of the household pork consumption account and examines the use of apparent pork consumption as a bridge that links consumption and production. Based on the pork consumption of urban and rural residents from 2000 to 2012, combined with per capita income, the total population and the rate of urbanization, we can analyse China＇s market demand in the pork trade for 2020, which will be useful for countries who are interested in potential trade with China. The research shows two important findings： First, with the per capita income of urban residents increasing, their per capita pork consumption is also on the rise, and as increasing numbers of rural residents move to urban areas with the acceleration of urbanization in China, the urban areas will be the most important pork market in the future. Secondly, the per capita pork consumption of rural residents will still be lower than that of urban residents in 2020, so there will be more room for growth in pork consumption in rural areas.

Conflict between Population and Urbanization Factors： Impact of Urban Heat Island on Energy Consumption Balance

High density of buildings and population in urban areas increases urban temperature, generally known as the urban heat island. Raised temperature, especially in SUlIuner, alms city centers into unwelcome hot areas, with direct effects on electricity demand and energy consttrnption for cooling buildings and increases the production of carbon dioxide and other pollutants. Therefore, by considering that the energy consumption in the world has been faced with intense crisis, it becomes increasingly important to study the effects of urban heat island on energy constunption in order to improve people＇s environment and decrease energy use in cities. This paper, therefore, is focused on urbanization and population size factors to understand tile influence way of these factors on formation of UHI and energy consumption balance. To achieve this aim, this paper explores literally the conceptual framework of confliction between population and urban structure, which produce UHI intensity and affected energy consumption balance. It is then discussed how these two factors can be affected and give implication to the city, and then, focuses on whether actions should be taken for balancing adaptation and mitigation UHI effects. It will be concluded by making the recommendations for preventive action and provide quality of life.

An adaptive routing protocol based on relative positions in VANETs

After presenting weaknesses of several classic routing protocols applied in vehicular ad hoc networks （VANETs） by a qualitative comparison, this paper proposes a novel self-adaptive routing protocol, named ARPP. With respect to the specific characteristics of VANETs, the proposed routing protocol adopts a dynamic topology establishment and time-varying control message sending mechanism. A direction-based forwarding strategy and a specific warning solution enhance the routing performance in ARPP. Simulation results show that the ARPP protocol outperforms the classic AODV in urban vehicle environment.

Income Growth,Urbanization,Changing Life Style and Energy Requirements in China

This paper aims to estimate the effects of changing life style and consumption demands driven by income growth and urbanization on increase of energy requirements in China, and es-timate the impacts of improvement in household consumption on mitigating energy requirements towards 2020, based on input-out-put analysis and scenarios simulation approach. The result shows that energy requirement per capita has increased by 159% for urban residents and 147% for rural residents from 1995 to 2004. Growth in household consumption driven by income growth and urbanization may induce a successive increase in energy require-ments in future. Per capita energy requirements of urban residents will increase by 240% during 2002-2015 and 330% during 2002-2020. Urbanization might lead to 0.75 billion ton of increment of energy requirements in 2020. About 45%-48% of total energy requirements in China might be a consequence of residents' life styles and the economic activities to support consumption demands in 2020. Under low-carbon life style scenario, per capita energy requirements of urban residents may decline to 97% in 2015 and 92% in 2020 in contrast with baseline scenario. That implies that China needs to pay a great attention to developing green low-carbon life style in order to realize mitigation target towards 2020.

Instruments of Urban Planning in Algerian City： Reality and Challenges

The year 1990 marks a line of rupture in the history of Algeria in general by the fundamental changes that have occurred, especially in the fields of urbanism and the land use planning, which has an important impact on space of the city and its environment. However, the absence of directives based on the reality of upstream territories and sometimes the conflict and the weakness of the instruments created at different levels： national, regional and local, have accelerated the galloping development of urbanization （the irrational consumption of land reserves inside and around the city）, often at the expense of the agricultural land. On the other hand, the involvement of new actors in the production of the framework built in the Algerian town was made without compliance with the rules of architecture and urbanism contained in the build permit and in the MPU （Master Plan of Land Use and Urbanism） and the SOP （Soil Occupation Plan） approved. The analyses conducted in the cities such as the capital Algiers and Setif illustrate this situation well. This article presents these situations of paradox, identifies their causes and suggests the recommendations to implement in the framework of studies and actions to take, to correct and regulate their mutations.

超声波预处理对污泥好氧/缺氧消化的效果

为评价超声波预处理对城市污泥好氧/缺氧消化效果的影响,将超声波-好氧/缺氧消化工艺与传统的好氧/缺氧消化工艺进行了对比研究。结果表明,经25 d消化处理,引进超声波后的好氧/缺氧消化效果显著提高,污泥的VSS去除率达到51.98%,高于传统好氧/缺氧消化的42.98%。2种工艺消化的污泥TCOD以及污泥上清液中的SCOD、TP和NH3-N的变化趋势相似;而经超声波-好氧/缺氧消化的污泥上清液中硝态氮和亚硝态氮浓度较传统好氧/缺氧的高,说明经超声波处理后的污泥中的硝化细菌的活性增强,硝化反应加快。