1,322 research outputs found
Zhenyu Luo's oracle-bone-script calligraphic couplet - 羅振玉書甲骨文聯
No full textZhenyu Luo, known as Shuyan (courtesy name) and Xuetang (pseudonym), was born in Jiangsu, China. Luo was a renowned epigraphy scholar. He made enormous contribution to research of oracle bone script and Dun Huang studies (related to art, architecture or scripts discovered in Dung Huang, China). After Hsinhai Revolution (a movement against the imperial power of Qing dynasty, 1911-1912), Luo still considered himself as a courtier of Qing dynasty. He is loyal to Puyi (the last Emperor of China, 1906-1967) and worked with Japanese to support the establishment of Manchukuo (a puppet state governed by Puyi and abolished in 1945), which makes his historical position more controversial. Luo has several published books. “Song Weng Ju Liao Hou Suo Zhe” is one of Luo’s renowned works.羅振玉，字叔蘊，號雪堂，江蘇人，金石學家，對甲骨文及敦煌學研究極有貢獻。其文學成就與王國維齊名。羅振玉以清代遺臣自居，辛亥革命後，仍忠於清室，擁護滿州國與日本交好而備受爭議。著作包含「松翁居遼後所著」等作品。Everywhere is quiet and peaceful. Lots of outstanding and talent people in the country make contribution to the country. I can retire from my position with a joyful mind.八方無事喜歸老，天下於今大有人。Postscript: extraction of "Ji Yin Qi Wen"" and dedication to Mingjia; Signature: Zhensong, Zhenyu Luo款識: 銘嘉仁兄屬, 貞松羅振玉; 題跋: 集殷契文1) Tse Tsung Chow; 2) Zhenyu Luo's seal and longevity; 3) Song weng ju liao hou zuo1) 周策縱; 2) 羅振玉科言印信長壽; 3) 松翁居遼後
Hybrid WSN and RFID indoor positioning and tracking system
Get PDFWireless sensor networks (WSNs), consisting of a large number of nodes to detect ambient environment, are widely deployed in a predefined area to provide more sophisticated sensing, communication, and processing capabilities, especially concerning the maintenance when hundreds or thousands of nodes are required to be deployed over wide areas at the same time. Radio frequency identification (RFID) technology, by reading the low-cost passive tags installed on objects or people, has been widely adopted in the tracing and tracking industry and can support an accurate positioning within a limited distance. Joint utilization of WSN and RFID technologies is attracting increasing attention within the Internet of Things (IoT) community, due to the potential of providing pervasive context-aware applications with advantages from both fields. WSN-RFID convergence is considered especially promising in context-aware systems with indoor positioning capabilities, where data from deployed WSN and RFID systems can be opportunistically exploited to refine and enhance the collected data with position information. In this papera, we design and evaluate a hybrid system which combines WSN and RFID technologies to provide an indoor positioning service with the capability of feeding position information into a general-purpose IoT environment. Performance of the proposed system is evaluated by means of simulations and a small-scale experimental set-up. The performed analysis demonstrates that the joint use of heterogeneous technologies can increase the robustness and the accuracy of the indoor positioning systems
Crisis and Responses: the Federal Reserve and the Financial Crisis of 2007-2008
Get PDFRealizing that their traditional instruments were inadequate for responding to the crisis that began on 9 August 2007, Federal Reserve officials improvised. Beginning in mid-December 2007, they implemented a series of changes directed at ensuring that liquidity would be distributed to those institutions that needed it most. Conceptually, this meant America's central bankers shifted from focusing solely on the size of their balance sheet, which they use to keep the overnight interbank lending rate close to their chosen target, to manipulating the composition of their assets as well. In this paper, I examine the Federal Reserve's conventional and unconventional responses to the financial crisis of 2007-2008.
Enhancing WSN-Based Indoor Positioning and Tracking through RFID Technology2012 Fourth International EURASIP Workshop on RFID Technology
No full textEnhanced electrochemical CO2 reduction to ethylene over CuO by synergistically tuning oxygen vacancies and metal doping
No full textElectrochemical CO2 reduction to multi-carbon fuels and chemicals is intriguing but remains a challenge. Here, we report that a combination of Sn doping and creation of oxygen vacancies (V-O) can synergistically boost CO2 reduction to C2H4 over CuO nanosheets with an onset potential of 0.7 V (versus reversible hydrogen electrode). The activity and selectivity of CuO can be easily tuned by manipulation of Sn dopant and V-O contents. The Faradaic efficiency toward C2H4 formation over Sn-doped CuO(V-O) approaches 48.5% -h 1 2%, which maintains stability over 24 h at a mild overpotential, in contrast to a maximum of 26.8% +/- 2.2% over pristine CuO. The Sn-doped CuO(V-O) catalyst presents an approximately 2.3-fold improvement in C2H4 current compared to undoped CuO at similar overpotentials. Theoretical calculations further show that doping of VO-enriched CuO surface by Sn lowers the dimerization energy of adsorbed CO intermediate, thereby promoting C-C coupling to yield C2H4.
Activated TiO2 with tuned vacancy for efficient electrochemical nitrogen reduction
No full textRenewable energy-driven electrochemical N-2 reduction reaction (NRR) provides a green and sustainable route for NH3 synthesis under ambient conditions but is plagued by a high reaction barrier and low selectivity. To promote NRR, modification of the catalyst surface to increase N-2 adsorption and activation is key. Here, we show that engineering surface oxygen vacancies of TiO2 permits significantly enhanced NRR activity with an NH3 yield rate of about 3.0 mu g(NH3)h(-)(1 )mg(cat.)(-1) and a faradaic efficiency (FE) of 6.5% at -0.12 V (vs. the reversible hydrogen electrode, RHE). Efficient conversion of N-2 to NH3 is achieved in a wide applied potential range from -0.07 to -0.22 V (vs. RHE) with NH3 production rates >= 2.0 RgNH(3 )mu g(NH3)h(-)(1 )mg(cat.)(-1) and NH3 FEs >= 4.9%, respec- tively. An NH3 FE as high as 9.8% is obtained at a low overpotential of 80 mV. Density functional theory calculations reveal that the surface oxygen vacancies in TiO2 play a vital role in facilitating electrochemical N-2 reduction by activating the first protonation step and also increasing N-2 chemisorption (relative to *H).
Deterioration mechanism of adhesion properties of FRP-soil interface induced by moisture
Get PDFThe deterioration of FRP-soil interfacial adhesion due to water intrusion has been a core issue in geotechnical engineering, but its microscopic mechanism remains unclear. In this study, molecular dynamics (MD) simulation method is employed to reveal the microscopic deterioration mechanism of water on adhesion properties of epoxy-quartz (i.e., FRP-soil subsystem) interface, the structural and dynamic characteristics of interlayer water film. The steered molecular dynamics (SMD) pulling simulation and the modified Bell’s model are used to evaluate the adhesion energy of epoxy-quartz interface in dry and wet cases. The simulation results show that (1) the interfacial water film weakens adhesion strength of epoxy-quartz interface, playing a dual role in “interface isolation” and “lubrication”, aggravating the interfacial debonding. (2) The work of adhesion, maximum pulling force, PMF, and adhesion energy of dry system are significantly higher than those of wet system. (3) The interlayer water film has a distinct layered structure: bound, free, and sparse water layers, which have different angle orientations and density distributions. (4) The diffusion coefficient increases with the rising thickness of free water layer, which may trigger a capillary-seepage effect and aggravate interface deterioration. This study provides atomic-scale insights into moisture-induced FRP-soil interface failure mechanism.The presentation of the authors' names and (or) special characters in the title of the pdf file of the accepted manuscript may differ slightly from what is displayed on the item page. The information in the pdf file of the accepted manuscript reflects the original submission by the author
CT scanning of internal crack mechanism and strength behavior of cement-fiber-tailings matrix composites
No full textThis paper deals the relationship between compressive strength and internal crack formation (e.g., crack width and volume) of cement-fiber-tailings matrix composites (CFTMC) using an industrial computed tomography system and scanning electron microscopy. Two types of fibers (polypropylene PP and polyacrylonitrile PAN) were used to manufacture CFTMC with a constant cement-to-tailings ratio, solid content and curing time of 1:6, 75 wt% and 14 days, respectively. The results showed that strength gaining of CFTMC increased remarkably with fiber additions which effectively improve its toughness. When compared to samples without fibers, the compressive strength of CFTMC was the highest because of the reduced interconnection between pores and high particle packing density. The internal structure analysis showed that the maximum crack widths of CFTMC increased when the fiber content increased from 0.3 to 0.6 wt%, regardless of fiber type, growing the crack volumes of samples. The failure pattern of all CFTMC samples was mainly tensile, shear and mixed failure (tensile/shear), and a high strength value accompanies with a big volume of crack. At last, the findings of this study may offer a key reference for fiber-reinforced backfills, which can lift their strength, stability and integrity behavior under extreme conditions, such as rock burst, squeezing ground, blast or seismic event. © 2020State Key Laboratory of Nonlinear Mechanics: LNM202009 Fundamental Research Funds for the Central Universities: FRF-TP-20-001A2 National Natural Science Foundation of China: 51804017This work was financially supported by the National Natural Science Foundation of China (Grant No. 51804017 ), the Opening Fund of State Key Laboratory of Nonlinear Mechanics (Grant No. LNM202009 ) and the Fundamental Research Funds for Central Universities (Grant No. FRF-TP-20-001A2 ). Special thanks are extended to Shuai Zhou from GRANPECT company limited for his technical help
When did the Lhasa and Qiantang Terranes “divorce”: constraints from Middle-Late Triassic alkaline trachytic lavas
No full textData accompanying "When did the Lhasa and Qiantang Terranes “divorce”: constraints from Middle-Late Triassic alkaline trachytic lavas" by Yang Song, Haifeng Li, Carl Guilmette, Ming Zheng, Douwe J.J. van Hinsbergen, Zhenyu Li, Faqiao Li. Tectonics, 2020.THIS DATASET IS ARCHIVED AT DANS/EASY, BUT NOT ACCESSIBLE HERE. TO VIEW A LIST OF FILES AND ACCESS THE FILES IN THIS DATASET CLICK ON THE DOI-LINK ABOV
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