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Working in Remote Areas Services are scarce in mountainous regions
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《China Population Today》 1995年第Z1期23-23,共1页
WorkinginRemoteAreasServicesarescarceinmountainousregionsServiceDeliveryinRemoteandIsolatedAreasAthirtyyearo... WorkinginRemoteAreasServicesarescarceinmountainousregionsServiceDeliveryinRemoteandIsolatedAreasAthirtyyearoldmotherofDainati... 展开更多
关键词 working in Remote areas Services are scarce in mountainous regions
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Factors Influencing Migrant Workers' Urban Labor Patterns: Willing Working Time in Urban Areas as the Mediator
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作者 Fuhao Zeng 《管理科学与研究(中英文版)》 2021年第1期47-55,共9页
China is witnessing a very complicated economic development environment.Migrant workers'working patterns will directly affect their income level and the realization of many economic and social development goals.Th... China is witnessing a very complicated economic development environment.Migrant workers'working patterns will directly affect their income level and the realization of many economic and social development goals.This paper collects relevant data from three places:Shanghai,Lanzhou and Chengdu for empirical research whose results show that determinants of migrant worker's willing working time in urban areas mainly include the“income-consumption difference”,“urban-rural consumption difference”and their“urban income and expenditure uncertainty”.These factors directly affect their effective working time in the city,and determine their choice of choosing corresponding work patterns.From the significant differences of these factors,we can see that migrant workers in China is still struggling to solve their material needs under the pressure of livelihood,and less attention is paid to their spiritual needs and the pursuit of quality of life. 展开更多
关键词 Migrant workers'work Pattern Willing working Time in Urban areas Analysis of Influencing Factors Empirical Research
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Active protection of work area against explosion of dust-gas mixture
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作者 Zbigniew Szkudlarek Sebastian Janas 《International Journal of Coal Science & Technology》 EI CAS CSCD 2021年第4期674-684,共11页
Potentially explosive atmosphere can occur not only in the production systems of the food,energy,chemical and petrochemical industries but also in the production processes of the mining industry.Gases,vapours,mists an... Potentially explosive atmosphere can occur not only in the production systems of the food,energy,chemical and petrochemical industries but also in the production processes of the mining industry.Gases,vapours,mists and dusts arise can escape in an uncontrolled way during production,processing,transportation and storage of flammable substances.In combination with oxygen,they create explosive atmospheres that,if ignited,lead to an explosion causing catastrophic damage to peopled lives and property.To protect against the results of hazardous dust-gas mixtures explosions in a confined work space,where employees can stay,various control and protection mechanisms are used in the form of an active explosion-proof system.The article presents the results of tests on an active system for limiting the effects of ignition of gas and/or dust based on a highly efficient explosion suppression system-equipped with an ignition detection system,high-pressure fire extinguisher and a power supply and trigger system.Smokeless powder was used as the explosive charge and sodium bicarbonate as the suppressive material.Tests of the effectiveness of the active explosion suppression system were carried out on two devices:a small-size dry dust collector and a zone extinguishing system adapted for direct explosion suppression in closed working spaces.In both cases,the explosion suppression process took place through the action of extinguishing powder blown out of the fire extinguisher after membrane perforation by compressed combustion products. 展开更多
关键词 Gas hazard Explosive dust Suppression of explosion Safety of work area
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Selection of organic Rankine cycle working fluid based on unit-heat-exchange-area net power 被引量:1
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作者 郭美茹 朱启的 +2 位作者 孙志强 周天 周孑民 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第4期1548-1553,共6页
To improve energy conversion efficiency, optimization of the working fluids in organic Rankine cycles(ORCs) was explored in the range of low-temperature heat sources. The concept of unit-heat-exchange-area(UHEA) net p... To improve energy conversion efficiency, optimization of the working fluids in organic Rankine cycles(ORCs) was explored in the range of low-temperature heat sources. The concept of unit-heat-exchange-area(UHEA) net power, embodying the cost/performance ratio of an ORC system, was proposed as a new indicator to judge the suitability of ORC working fluids on a given condition. The heat exchange area was computed by an improved evaporator model without fixing the minimum temperature difference between working fluid and hot fluid, and the flow pattern transition during heat exchange was also taken into account. The maximum UHEA net powers obtained show that dry organic fluids are more suitable for ORCs than wet organic fluids to recover low-temperature heat. The organic fluid 1-butene is recommended if the inlet temperature of hot fluid is 353.15-363.15 K or443.15-453.15 K, heptane is more suitable at 373.15-423.15 K, and R245 ca is a good option at 483.15-503.15 K. 展开更多
关键词 organic Rankine cycle(ORC) working fluid selection net power heat exchange area
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Hierarchical power control for OFDM based LTE system
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作者 郑小金 Xu Jing Wang Jiang 《High Technology Letters》 EI CAS 2013年第3期315-320,共6页
3 GPP LTE has approved uplink intra-cell power control and defined overload indicator (OI) for uplink inter-cell power contrQ1 to mitigate the inter-cell interference (ICI), respectively. In this pa- per, we propo... 3 GPP LTE has approved uplink intra-cell power control and defined overload indicator (OI) for uplink inter-cell power contrQ1 to mitigate the inter-cell interference (ICI), respectively. In this pa- per, we propose a hierarchical power control ( HPC ) scheme where intra-eell and inter-cell power controls interact with each other. The inter-cell power control eommand is generated by radio re- source management (RRM) entity according to the ICI-load model together with the current ICI and served load information. This ICI-load model is proposed as a guideline for coordination among cells to enable the system to approach its system specific interference over thermal noise (IoT) work area. Simulation results show that for HPC scheme, the system' s IoT is well controlled to fit its pre-de- fined work area and the power efficiency is improved significantly. Our proposed scheme is also ro- bust to different settings of its inter-cell power control period. 展开更多
关键词 inter-cell interference (ICI) coordination hierarchical power control HPC tar-get SINR IoT work area
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Effect of Surface Roughness on the Oxidation Behavior of a Directionally Solidified Ni-Based Superalloy at 1,100℃ 被引量:7
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作者 Li Wang Wei-Guo Jiang +4 位作者 Xiang-Wei Li Jia-Sheng Dong Wei Zheng Hui Feng Lang-Hong Lou 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2015年第3期381-385,共5页
The effect of surface roughness on the oxidation behavior of a directionally solidified Ni-based superalloy was investigated by surface mapping microscope,scanning electron microscope and X-ray diffraction.It was foun... The effect of surface roughness on the oxidation behavior of a directionally solidified Ni-based superalloy was investigated by surface mapping microscope,scanning electron microscope and X-ray diffraction.It was found that specimens with surface roughness of 0.05 urn exhibit the best oxidation resistance,while specimens with surface roughness of 0.14 μm behave worse than specimens with surface roughness of 0.83 μm.The specimens with surface roughness of 0.05 μm have the best oxidation resistance,which is mainly due to the smallest surface area exposed in air and thinnest work-hardening layer.The AlOlayer alleviates the oxidation process of the specimens with surface roughness of 0.83 μm,and this is the possible reason for the better oxidation resistance of samples with surface roughness of 0.83 μm than samples with surface roughness of 0.14 μm. 展开更多
关键词 Superalloy Oxidation Surface roughness Surface area work hardening
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