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Beijing Review 2017年第35期60卷 20-21页

作者： qi kai Beijing Academy of Social Sciences

International credit-rating agencies are products of economic globalization, especially the liberalization and integration of financial and investment activities. As borrowers and bond issuers could be geographically ... 详细信息

关键词：替代率经济全球化信用评级投资活动一体化自由化金融债券

Overcoming Investment Risks Chinese investors need to thoroughly understand local conditions before investing in Africa

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ChinAfrica 2018年第4期10卷 38-39页

作者： qi kai Beijing Academy of Social Sciences

With abundant labor resources and the increase in policy sup port for economie development and loreign investment, Africa is becoming a new sought-after destination for investment by multinational companics.

关键词： In Overcoming Investment Risks Chinese investors need to thoroughly understand local conditions before investing in Africa Security

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ChinAfrica 2017年第9期9卷 20-21页

作者： qi kai the Beijing Academy of Social Sciences

BRICS members should establish a new independent rating agency to break the current monopoly and play a greater role in the global financial market.

关键词： Alternative Rating Agency

Investment risk of rural family education: From the persepective of educational cost and income

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Ecological Economy 2017年第4期10卷 313-320页

作者： MENG qi-kai Shenyang Agricultural University

With the implementation of the policy of popularization of education, rural families make the choice of interests and behavior decisions through the calculation of their own benefits and costs, and gradually become the main body of rural education investment decisions. The relationship between educational cost and income plays a major role in the rural family education investment. Based on the current situation of rural education in our country, this paper focuses on the risk of rural education investment and rural education costs and benefits, and then puts forward scientific, operational measures and suggestions.

关键词： rural family education investment cost and income investment risk

ASEAN-CHINA MEDIA COOPERATION FORUM 2019 China-ASEAN media cooperation enters a new stage of comprehensive development

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China Report ASEAN 2019年第6期4卷 34-35页

作者： qi kai 不详

This year marks the China- ASEAN Year of Media Exchange, and in a congratulatory message to its opening ceremony held in Beijing on February 20, Chinese President Xi Jinping declared that China-ASEAN relations had entered a new phase of all-around development. He expressed hope that media from both sides would serve as messengers of friendly exchange, facilitators of pragmatic cooperation.

关键词： ASEAN-CHINA COOPERATION cooperation

AU’s Economic Integration

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ChinAfrica 2017年第7期9卷 10-11页

作者： qi kai Beijing Academy of Social Sciences

the African union(Au)has been widely regarded as an important regional organization to advance economic and social prosperity in ***,the organization and African countries face a changed world scenario from two ***,the 28th Au summit held earlier this year accepted the return of Morocco 33 years after the North African country withdrew in ***,the Au along with other regional organizations face the danger of impending

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Effects of mineralogical composition on uniaxial compressive strengths of sedimentary rocks

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Petroleum Science 2023年第5期20卷 3062-3073页

作者： Zhen-Liang Chen Huai-Zhong Shi Chao Xiong Wen-Hao He Hai-Zhu Wang Bin Wang Nikita Dubinya kai-qi Ge Beijing Key Laboratory of Optical Detection Technology for Oil and Gas China University of Petroleum-BeijingBeijing102249China State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum-BeijingBeijing102249China Basic Research Center for Energy Interdisciplinary College of ScienceChina University of PetroleumBeijing102249China Schmidt Institute of Physics of the Earth of the Russian Academy of Sciences 123242MoscowRussia Science and Technology Center of Geophysics and Mineral Resources Moscow Institute of Physics and Technology141701DolgoprudnyRussia Shale Gas Exploration and Development Project Manager Department CNPC Chuanqing Drilling Engineering Co.Ltd.ChengduSichuan610051China

Figuring out rock strength plays essential roles in the sub ground mining activities,such as oil and gas well drilling and hydraulic fracturing,coal mining,tunneling,and other civil engineering *** help understand the effects of the mineralogical composition on evaluating the rock strength,this research tries to establish indirect prediction models of rock strength by specific input mineral contents for common sedimentary *** rock samples collected from the outcrops in the Sichuan Basin,uniaxial compression tests have been conducted to sandstone,carbonate,and shale *** with statistical analysis,the experimental data prove it true that the mineralogical composition can be utilized to predict the rock strength under specific conditions but the effects of mineralogical composition on the rock strength highly depend on the rock *** to the statistical analysis results,the predicted values of rock strengths by the mineral contents can get high accuracies in sandstone and carbonate rocks while no evidences can be found in shale *** best indicator for predicting rock strength should be the quartz content for the sandstone rocks and the dolomite content for the carbonate ***,to improve the evaluation accuracy,the rock strengths of sandstones can be obtained by substituting the mineral contents of quartz and clays,and those of carbonates can be calculated by the mineral contents of dolomite and ***,the research data point out a significant contrast of quartz content in evaluating the rock strength of the sandstone rocks and the carbonate *** quartz content helps increase the sandstone strength but decrease the carbonate *** for shale rocks,no relationship exists between the rock strength and the mineralogical composition(e.g.,the clay fractions).To provide more evidences,detailed discussion also provides the readers more glances into the framework of the rock matrix,which can

关键词： Uniaxial compressive strength Quartz content Clay Sandstone Carbonate Shale

Fabrication and Characterization of Ni-Al_2O_3 Nano-Composite Coatings by Sediment Co-Deposition

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稀有金属材料与工程 2009年第A3期38卷 68-72页

作者： Feng qiuyuan Zhang Jian Li Tingju qi kai Zhang Xiaoli Teng Haitao Zhang Yu Liu Changsheng Jin Junze State Key Laboratory of Materials Modification Dalian University of Technology Dalian 116024 China Northeastern University Shenyang 110004 China

Ni-Al2O3 nano-composite coatings were fabricated by sediment co-deposition (SCD) from Watt’s type electrolyte containing nano-Al2O3 particles without any additives. For comparison, Ni-Al2O3 nano-composite coatings were prepared by conventional electro-plating (CEP) under experimental conditions. Effects of process parameters, such as nano-Al2O3 concentration in plating solution, current density, stirring rate, and bath temperature, on nano-Al2O3 content in composite coatings were investigated. The distribution of elements in deposit, and the bonding strength between coating and substrate was analyzed by electron probe microanalyzer (EPMA) and auto-scratch apparatus, respectively. It is found that the nano-Al2O3 concentration in plating solution, current density and stirring rate are three main factors affecting the particles content in deposit, and played a key role in the formation of composite coatings. The nano-Al2O3 content in composite coatings increased with increasing of nano-Al2O3 concentration in plating solution, current density and stirring rate to reach a maximum value, and then reduced slightly. The contents of nano-Al2O3 particles in composite coatings by the SCD technique were higher than that by the CEP technique. The co-deposited nano-Al2O3 particles embedded uniformly in the Ni matrix. The coating was well adhesion with substrate. It is demonstrated that the SCD technique is an efficient approach for improving the nano-Al2O3 content in Ni-Al2O3 composite coatings.

关键词：共沉积电解质电镀纳米氧化铝

Effects of Paranosema locustae(Microsporidia) on the development and morphological phase transformation of Locusta migratoria(Orthoptera: Acrididae) through modulation of the neurotransmitter taurine

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Journal of Integrative Agriculture 2020年第1期19卷 204-210页

作者： LI Ao-mei YIN Yue ZHANG Yu-xin ZHANG Liu ZHANG kai-qi SHEN Jie TAN Shu-qian SHI Wang-peng Department of Entomology and MOA Key Lab of Pest Monitoring and Green Management College of Plant ProtectionChina Agricultural University

Neurotransmitters are important in the maintenance of phase transformation of Locusta migratoria(Arthropoda: Orthoptera). Here, the effects of the entomopathogen Paranosema locustae on the neurotransmitter taurine in migratory locusts were studied using biochemical methods. After inoculation with P. locustae, the taurine content of infected locusts significantly declined, but F/C values(ratio between the length of hind femur and the width of the head of locust) increased significantly, compared to healthy locusts. Meanwhile, F/C values of infected locusts that were injected with 2 μg of taurine showed no significant differences from those of healthy locusts, demonstrating that supplemental taurine inhibited the changes in morphological phase caused by P. locustae. Paranosema locustae infection also caused longer developmental durations and lower body weights of locusts, but these changes were unaffected after injection with taurine. These results provided new insights into the mechanisms by which microsporidian parasites affected their locust hosts.

关键词： Locusta migratoria Paranosema locustae neurotransmitter taurine morphological characteristics