178 research outputs found
Characteristics of the Jinwuwei and Its Relationship to the Xingjun System
No full textThis article analyzes the relationship between the Jinwuwei 金吾衛, which was one of the twelve central guards (Shierwei 十二衛), and the system of the army in the field (Xingjun 行軍), through an examination of Tang period tactical manuals, like Taibaiyin-jing 太白陰経, and the statutes concerning the duties of Jinwuwei contained in Tongdian (通典).The research to date argues that since the main duty of the Jinwuwei was to patrol the capital palace, it was more a security police force than an army regiment. This notion is based on Tangliudian 唐六典, by and large an explanation of various Tang institutions. However, according to Tongdian, the majority of the statutes concerning the duties of Jinwuwei was derived from the Xingjun system as described in the Tang tactical manuals.During the Beizhao 北朝 and Sui-Tang periods, whenever an army in the field was organized, a unit called yuhoujun 虞候軍 was usually formed within it to take charge of reconnaissance and sentry duties during military operations, the same duties entrusted to the Jinwuwei. In other words, the main purpose of the Jinwuwei was to guard the Emperor like a yuhoujun unit, whenever he journeyed away from the capital.The author concludes that the Jinwuwei should be considered essentially a yuhoujun unit within the Shierwei, the army in the field (Xingjun) under the direct command of the Emperor.journal articl
Earthworms increase forest litter mass loss irrespective of deposited compounds – A field manipulation experiment in subtropical forests
No full textEarthworms modulate carbon and nitrogen cycling in terrestrial ecosystems, but their effect may be compromised by the deposition of pollutants from industrial emissions. However, studies investigating how deposited compounds affect the role of earthworms in carbon cycling such as litter decomposition are lacking, although the interactions of earthworms and deposited compounds are important for understanding the impact of pollutants on ecosystems and the potential of earthworms in bioremediation. We performed a 365-day in situ litterbag decomposition experiment in a deciduous (Quercus variabilis) and coniferous (Pinus massoniana) forest in southeast China. We manipulated nitrogen (N), sodium (Na), and polycyclic aromatic hydrocarbons (PAHs) as model compounds during litter decomposition with and without earthworms (Eisenia fetida). After one year, N, Na, and PAH all slowed down litter mass loss, with the effects of Na being the strongest. By contrast, E. fetida generally increased litter mass loss, and the positive effects were uniformly maintained irrespective of the type of compounds added. However, the pathways to how earthworms increased litter mass loss varied among the compounds added and the two forests studied. As indicated by structural equation modeling, earthworms mitigated the negative effects of deposited compounds by directly increasing litter mass loss and indirectly increasing soil pH and microbial biomass. Overall, the results indicate that the acceleration of litter mass loss by earthworms is little affected by deposited compounds, and that earthworms have the potential to mitigate negative impacts of pollutants on litter decomposition and ecosystem processes.Jiangsu Forestry Science and technology innovation and promotion projectKey specialized research and development breakthrough program in Henan provinceNational Natural Science Foundation of China http://dx.doi.org/10.13039/501100001809Scholarship of China Scholarship CouncilStrategic Priority Research Program of the Chinese Academy of Sciences (A)The Key Program of Scientific Research projects of Hunan Provincial Education DepartmentOpen-Access-Publikationsfonds 202
Photonic Integration Circuits in China
No full textPhotonic integrated circuits (PICs) technologies in China have made rapid progress in the past decade. In this paper, recent advances and future prospective of PICs in China are introduced and discussed, respectively. More than nine major projects in the field of PICs have been issued. Various material platforms and technologies have been developed to realize photonic integrated devices for many applications focusing on broadband communication, such as optical and wireless network, optical interconnects, and optical coherent communication. Many research achievements and breakthrough have been made under the support of these projects, such as silicon photonics transceiver, InP- based transceiver, and optical and microwave signal processing chips. It can be expected that the PICs technology will be continuously supported in the next five years, since it has been considered as one of the key enabling technologies for supporting several national major assignments and strategies, such as broadband communication, supercomputing and datacenter.National Natural Science Foundation of China [61321063, 61090390, 61522509, 61535012]; National High-Tech Research and Development Program of China [2011AA010303, 2011AA010305]; Thousand Young Talent ProgramSCI(E)[email protected]; [email protected]; [email protected]; [email protected]; [email protected]; [email protected]; [email protected]; [email protected]
Ultracompact and silicon-on-insulator-compatible polarization splitter based on asymmetric plasmonic-dielectric coupling
No full textAn ultracompact and silicon-on-insulator-compatible polarization splitter (PS) is proposed by utilizing asymmetric directional coupling between a hybrid plasmonic waveguide and a strip dielectric waveguide. Owing to the plasmon-assisted asymmetry, birefringence is highly enhanced. Polarization splitting can be realized by strong coupling of one polarization while the other polarization is phase-mismatched. As an example, a PS based on strong TM coupling is demonstrated at the wavelength of 1.55 mu m with a coupling length of 4.13 mu m. Extinction ratios are 20.9 and 16.4 dB for TM and TE polarizations, respectively. The device is also broadband and fabrication-tolerant.http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000327452700007&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701OpticsPhysics, AppliedSCI(E)EI23ARTICLE2199-20311
Numerical Simulation of the Influence of Intake Grille Shape on the Aerodynamic Performance of a Passenger Car
No full textThe Assessment of the Feasibility of Widely Using Electric Vehicles: Based on the Analytic Hierarchy Process
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Radiocarbon-Refined Archaeological Chronology and the History of Human Activity in the Southern Tarim Basin
No full textFamous for Taklimakan, the world’s second largest sandy desert, the Tarim Basin in Xinjiang has long attracted researchers from various fields to investigate its paleoenvironment and antiquity. The southern part of this basin is an ideal region in which to investigate the interactions between humans and the environment due to its fragile habitat and prosperous ancient civilizations. However, the lack of direct radiocarbon dating data has caused the chronologies of some of the archaeological sites to be debatable, which hinders our ability to reconstruct historical patterns of human activity and further understand, in a coherent manner, their interaction with the environment. This study reports 25 new radiocarbon dates acquired from ten undated archaeological sites in the southern Taklimakan Desert in order to refine their chronologies. Based on this, a radiocarbon dataset was established to reveal the trajectory of human activity with the support of Bayesian chronological modeling. The results indicate a two-millennium continuous flourishing of the local society since the beginning of the first millennium BCE, as well as a peak of human activity during the Tang Dynasty (618–907 CE). The distinct trajectory of human activity in the southern Tarim Basin revealed by this study provides a solid foundation for further assessments of human–environment interaction in the Tarim Basin and along the Silk Road
Current Status and Future Prospects of Commercial Wind Power Generation
No full textRising global population, socioeconomic development, industrialisation, lifestyle changes, mobility, and transportation all depend on fossil fuels. This reliance creates environmental pollution, CO2 emissions, depletion of fossil fuel resources, energy insecurity, and increased financial and environmental costs. Renewable energy sources, especially wind, provide a viable alternative to fossil fuels, decreasing reliance on them and mitigating environmental impacts. Despite considerable advances in the use of renewable wind energy for power generation, significant challenges persist in realising the full potential of this promising energy source. Therefore, the purpose of this study is to thoroughly examine global wind power generation, its distribution by region, and the challenges associated with using wind energy, such as issues with the global supply chain, equipment manufacturers, rare earth materials required for wind turbines, and a lack of skilled workforces in the wind energy sector. The major finding and novelty of the study includes a national action plan for wind power generation that encompasses diverse tasks and activities, which can be tailored to the specific requirements of a country. Additionally, the study proposed a classification of countries into six groups based on the availability of specific energy types within their national jurisdictions, aiming for an optimal energy mix to achieve energy security, sustainability, and climate impact mitigation. The other contribution of the study is outlining present difficulties, their origins, and potential solutions that governments, legislators, and other wind power stakeholders encounter while formulating strategies for wind power generation
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