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Analysis of Ethical Problems in China's Engineering Activities and Countermeasures
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作者 Li Cici Gao Xiaoyan 《Meteorological and Environmental Research》 CAS 2018年第2期37-38,46,共3页
Engineering ethics is generated from the research on ethical issues caused by engineering activities. The development of engineering ethics in China was compared with that of European countries and the United States. ... Engineering ethics is generated from the research on ethical issues caused by engineering activities. The development of engineering ethics in China was compared with that of European countries and the United States. Problems such as non-standard evaluation of registered engineers,weak ethical awareness,and lack of scientific understanding in engineering activities were discussed. Establishing and improving the system of registered engineers,strengthening education in engineering ethics,and promoting public participation will be the only way for the development of engineering ethics in China. 展开更多
关键词 engineering activities engineering ethics Ethical issues COUNTERMEASURES
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Prospect and Retrospect of ECEPDI's Participation in Engineering Activities of Nuclear Power Projects
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《Electricity》 1997年第4期7-10,共4页
关键词 Prospect and Retrospect of ECEPDI’s Participation in engineering activities of Nuclear Power Projects
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2006 Schedule of Activities Foundry Institution of Chinese Mechanical Engineering Society (FICMES)
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《China Foundry》 SCIE CAS 2006年第1期71-71,共1页
关键词 FICMES Schedule of activities Foundry Institution of Chinese Mechanical engineering Society
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Identification and distribution of 13003 landslides in the northwest margin of Qinghai-Tibet Plateau based on human-computer interaction remote sensing interpretation
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作者 Wei Wang Yuan-dong Huang +8 位作者 Chong Xu Xiao-yi Shao Lei Li Li-ye Feng Hui-ran Gao Yu-long Cui Shuai Wu Zhi-qiang Yang Kai Ma 《China Geology》 CAS CSCD 2024年第2期171-187,共17页
The periphery of the Qinghai-Tibet Plateau is renowned for its susceptibility to landslides.However,the northwestern margin of this region,characterised by limited human activities and challenging transportation,remai... The periphery of the Qinghai-Tibet Plateau is renowned for its susceptibility to landslides.However,the northwestern margin of this region,characterised by limited human activities and challenging transportation,remains insufficiently explored concerning landslide occurrence and dispersion.With the planning and construction of the Xinjiang-Tibet Railway,a comprehensive investigation into disastrous landslides in this area is essential for effective disaster preparedness and mitigation strategies.By using the human-computer interaction interpretation approach,the authors established a landslide database encompassing 13003 landslides,collectively spanning an area of 3351.24 km^(2)(36°N-40°N,73°E-78°E).The database incorporates diverse topographical and environmental parameters,including regional elevation,slope angle,slope aspect,distance to faults,distance to roads,distance to rivers,annual precipitation,and stratum.The statistical characteristics of number and area of landslides,landslide number density(LND),and landslide area percentage(LAP)are analyzed.The authors found that a predominant concentration of landslide origins within high slope angle regions,with the highest incidence observed in intervals characterised by average slopes of 20°to 30°,maximum slope angle above 80°,along with orientations towards the north(N),northeast(NE),and southwest(SW).Additionally,elevations above 4.5 km,distance to rivers below 1 km,rainfall between 20-30 mm and 30-40 mm emerge as particularly susceptible to landslide development.The study area’s geological composition primarily comprises Mesozoic and Upper Paleozoic outcrops.Both fault and human engineering activities have different degrees of influence on landslide development.Furthermore,the significance of the landslide database,the relationship between landslide distribution and environmental factors,and the geometric and morphological characteristics of landslides are discussed.The landslide H/L ratios in the study area are mainly concentrated between 0.4 and 0.64.It means the landslides mobility in the region is relatively low,and the authors speculate that landslides in this region more possibly triggered by earthquakes or located in meizoseismal area. 展开更多
关键词 LANDSLIDES Human-computer interaction interpretation Landslide database Spatial distribution Earthquake RAINFALL Human engineering activity Qinghai-Tibet Plateau Geological hazards survey engineering
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Construction, characterization and application of a genomewide promoter library in Saccharomyces cerevisiae 被引量:1
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作者 Ting Yuan Yakun Guo +9 位作者 Junkai Dong Tianyi Li Tong Zhou Kaiwen Sun Mei Zhang Qingyu Wu Zhen Xie Yizhi Cai Limin Cao Junbiao Dai 《Frontiers of Chemical Science and Engineering》 SCIE EI CAS CSCD 2017年第1期107-116,共10页
Promoters are critical elements to control gene expression but could behave differently under various growth conditions. Here we report the construction of a genome-wide promoter library, in which each native promoter... Promoters are critical elements to control gene expression but could behave differently under various growth conditions. Here we report the construction of a genome-wide promoter library, in which each native promoter in Saccharomyces cerevisiae was cloned upstream of a yellow fluorescent protein (YFP) reporter gene. Nine libraries were arbitrarily defined and assembled in bacteria. The resulting pools of promoters could be prepared and transformed into a yeast strain either as centromeric plasmids or integrated into a genomic locus upon enzymatic treatment. Using fluorescence activated cell sorting, we classified the yeast strains based on YFP fluorescence intensity and arbitrarily divided the entire library into 12 bins, representing weak to strong promoters. Several strong promoters were identified from the most active bins and their activities were assayed under different growth conditions. Finally, these promoters were applied to drive the expression of genes in xylose utilization to improve fermentation efficiency. Together, this library could provide a quick solution to identify and utilize desired promoters under user-defined growth conditions. 展开更多
关键词 synthetic biology YEAST promoter activity metabolic engineering xylose utilization
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Non-metallic gold nanoclusters for oxygen activation and aerobic oxidation 被引量:2
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作者 Guomei Zhang Ruru Wang Gao Li 《Chinese Chemical Letters》 SCIE CAS CSCD 2018年第5期687-693,共7页
In recent decade, Au nanoclusters of atomic precision (AunLm, where L= organic ligand: thiolate andphosphine) have been shown as a new promising nanogold catalyst. The well-defined AunLm catalystspossess unique ele... In recent decade, Au nanoclusters of atomic precision (AunLm, where L= organic ligand: thiolate andphosphine) have been shown as a new promising nanogold catalyst. The well-defined AunLm catalystspossess unique electronic properties and frameworks, providing an excellent opportunity to correlate theintrinsic catalytic behavior with the cluster's framework as well as to study the catalytic mechanismsover gold nanoclusters. In this review, we only demonstrate the important roles of the gold nanoclustersin the oxygen activation (e.g., 302 to 102) and their selective oxidations in the presence of oxygen (e.g., COto C02, sulfides to sulfoxides, alcohol to aldehyde, styrene to styrene epoxide, amines to imines, andglucose to gluconic acid). The size-specificity (Au25 (1.3 nm), Au38 (].5 nm), Au144 (1.9 nm), etc.), ligandengineering (e.g., aromatic vs aliphatic), and doping effects (e.g., copper, silver, palladium, and platinum)are discussed in details. Finally, the proposed reactions' mechanism and the relationships of clusters'structure and activity at the atomic level also are presented. 展开更多
关键词 Gold nanocluster Oxygen activation Aerobic oxidation Size-specificity Ligand engineering Doping effects
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A New Hybrid Control Scheme for an Integrated Helicopter and Engine System 被引量:3
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作者 ZHANG Haibo WANG Jiankang +1 位作者 CHEN Guoqiang YAN Changkai 《Chinese Journal of Aeronautics》 SCIE EI CSCD 2012年第4期533-545,共13页
A new hybrid control scheme is presented with a robust multiple model fusion control(RMMFC) law for a UH-60 helicopter and an active disturbance rejection control(ADRC) controller for its engines.This scheme is a ... A new hybrid control scheme is presented with a robust multiple model fusion control(RMMFC) law for a UH-60 helicopter and an active disturbance rejection control(ADRC) controller for its engines.This scheme is a control design method with every subsystem designed separately but fully considering the couplings between them.With three subspaces with respect to forward flight velocity,a RMMFC is proposed to devise a four-loop reference signal tracing control for the helicopter,which escapes the closed-loop system from unstable state due to the extreme complexity of this integrated nonlinear system.The engines are controlled by the proposed ADRC decoupling controller,which fully takes advantage of a good compensation ability for unmodeled dynamics and extra disturbances,so as to compensate torque disturbance in power turbine speed loop.By simulating a forward acceleration flight task,the RMMFC for the helicopter is validated.It is apparent that the integrated helicopter and engine system(IHES) has much better dynamic performance under the new control scheme.Especially in the switching process,the large transient is significantly weakened,and smooth transition among candidate controllers is achieved.Over the entire simulation task,the droop of power turbine speed with the proposed ADRC controller is significantly slighter than with the conventional PID controller,and the response time of the former is much faster than the latter.By simulating a rapid climb and descent flight task,the results also show the feasibility for the application of the proposed multiple model fusion control.Although there is aggressive power demand in this maneuver,the droop of power turbine speed with an ADRC controller is smaller than using a PID controller.The control performance for helicopter and engine is enhanced by adopting this hybrid control scheme,and simulation results in other envelope state give proofs of robustness for this new scheme. 展开更多
关键词 helicopter engine hybrid control robust multiple model fusion control active disturbance rejection control PID control
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