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Copyright of Journal of Xi'an Jiaotong University is the property of Editorial Office of Journal of Xi'an Jiaotong University and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The evaluation of reservoir damage is important to reservoir protection and oil and gas yield improvement. Reservoirs in the Bozhong sag of the Bohai Bay Basin are naturally fractured tight reservoirs, coring in these reservoirs is difficult and many different methods of evaluating the reservoir damage are in use, resulting in difficulties in implementing effective reservoir protection measures. To deal with this problem, combined with the actual situation of reservoirs, design and manufacture 3D printed fractured cores with transparent and visible interior and reservoir damage evaluation devices. In evaluating reservoir damage by different drillin fluids used in Bozhong, the flow-rate damage rate instead of the permeability damage rate is used. Experimental results show that the drill-in fluid EZFLOW, which is presently in field application, has stable rheology and good filtration property. Compared with 3% bentonite drilling fluid, the EZFLOW drill-in fluid imposes smaller damage to the reservoirs, the rates of reservoir damage imposed by the EZFLOW drill-in fluid are between 11.7% and 26.2%, which are weak reservoir damage. The rate of damage to the cores is decreasing with increase in the opening degrees of the cores; for different fractured cores, the longer the cores and the wider the fractures, the higher the damage rate. [ABSTRACT FROM AUTHOR]

At present, the environmental problems caused by fossil fuels are becoming more prominent, and it is imperative to reduce carbon emissions. Based on this situation, the solar photovoltaic technology has become the fastest growing renewable energy technology, and it has great promise to solve current resource and environmental problems. Owing to the characteristics of adjustable structure, sustainable use, and low cost, the luminescent solar concentrators are attracting more and more attention from among photovoltaic field. The typical luminescent solar concentrator is composed of two parts, including the light waveguide coated or embedded with the emitting fluorophores, a photovoltaic cell mounted on the light waveguide edge. Carbon dots have attracted increasing attention in the field of luminescent solar concentrators due to their environmental friendliness, economic applicability, simple synthesis methods, and excellent optical properties. However, when carbon dots are compatible with hydrophilic polymer waveguide materials as luminescent substrates, the poor compatibility of most carbon dots in polymers and the brittleness of hydrophilic polymers severely limit the practical application of luminescent solar concentrators. In order to solve these problems, the synthesis of a carbon dot doped with other elements or new carbon dot structure has become the focus of attention. In addition, the suitable host matrix needs to be explored, such as organicinorganic hybrid matrix, multifunctional matrix, polysiloxane matrix, etc. In this work, a bright yellow emitting silicon coated carbon dot with a Stokes shift of 150 nm, a quantum yield of 10. 94%, and good dispersibility and compatibility was synthesized using the hydrolysis condensation of 3-aminopropyltriethoxysilane, along with phthalic acid and o-phenylenediamine. At the same time, a series of 3 cm ×3 cm ×0. 1 cm sizes were prepared by combining dimethyl siloxane with good compatibility and high flexibility as the waveguide material, flexible luminescent solar concentrators based on silicon coated carbon dots with different mass percentages, among which the best performing solar concentrator has an energy conversion efficiency of 1. 05%. This work combines the advantages of silicon coated carbon dots with polydimethylsiloxane, which has potential value for the practical application of luminescent solar concentrators. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Xi'an Jiaotong University is the property of Editorial Office of Journal of Xi'an Jiaotong University and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Agricultural Resources & Environment / Nongye Ziyuan yu Huanjing Xuebao is the property of Journal of Agricultural Resources & Environment Editorial Board and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Natural Gas Industry is the property of Natural Gas Industry Journal Agency and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of National University of Defense Technology / Guofang Keji Daxue Xuebao is the property of NUDT Press and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of National University of Defense Technology / Guofang Keji Daxue Xuebao is the property of NUDT Press and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of China Plastics / Zhongguo Suliao is the property of Journal Office of CHINA PLASTICS and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In this paper, the low-temperature Raman and photoluminescence (PL) spectroscopy were employed to study the crystallization degree, stress distribution of the pure diamond film. Combined with electron irradiation and rapid annealing, the impurity defect structure of the pure diamond film was studied. Raman spectroscopy analysis shows that the stress distributions in edge and surface of the film are higher than in interior, which may be ascribed to the diamond growth mechanism, physical cutting and polishing damage to the films. The zero phonon lines in PL spectra show obvious temperature dependent, and the spectra peaks redshift, intensity reduction and low-temperature splitting with increase of temperature were explained by Jahn)Teller effect and electron-phonon coupling theory. Low temperature PL spectra observed distinct NV defects in the film after electron irradiation and 700 ℃ annealing, which indicate that the nitrogen mainly existed in the lattice with a form of substitution impurities. [ABSTRACT FROM AUTHOR]

Copyright of Packaging & Food Machinery is the property of Packaging & Food Machinery Magazine and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Shenyang Agricultural University is the property of Journal of Shenyang Agricultural University Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Oil Drilling & Production Technology / Shiyou Zuancai Gongyi is the property of Shiyou Zuancai Gongyi Bianjibu and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of China Brewing is the property of China Brewing Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Acta Materiae Compositae Sinica is the property of Acta Materiea Compositae Sinica Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

This paper focuses on the thrust and drag determination of the powered-on nacelle of civil airplanes. The thrust-drag bookkeepnng method based on computatoonal fluid dynamics is used to compute the thrust and drag. First, the control volume analysis of a powered-on nacelle js applied to study the computatoon methods for each force component. Then three test cases are numetccally investigated to demonstrate the thrus--drag bookkeeping process and accuracy. The NACA 1-85-75 jnlet test case shows that the present method has reasonable accuracy on the jnlet spillage drag. The computatoon results agree wel l with the experimental data. The DSFR nozzle from the propulsjon aerodynamccs workshop 2 js used to test the predjctjon predsjon on nozzle performance. The results show that the present computatoon method js wel l vaiidated. The devaatoon between the computatoon result and expeiimental data ss 0.003 to 0.004. The NAL-AER()-02-01 TPS nacelle case 's adopted to demonstrate the process of the thrus--drag bookkeeping process. Wjth the bookkeeping method, the nacelle drag vaHatjon wjth Mach number js revealed and associated wjth the How phenomena on the nacelle. [ABSTRACT FROM AUTHOR]

Optimization method has been well researched and developed in the past few decades. Studies have been also carried out on multi-disciplinary. multi-point, multi-objective, multi-constraint, and robust optimization as well as other optimization approaches. However, practical applications of these optimization methods still have difficulties in the engineering design. Therefore, by reviewing the application history of optimization methods in industrial design and analyzing the difficulties and problems in the application, "man-in-loop" is introduced as a methodology for applying optimization methods in practical engineering design. The concept, realization, and evolution of "man-in-loop" are explained with examples of aircraft aerodynamic design. Due to the significant development of artificial intelligence (Al) in non-linear regression and data mining, it is quite possible that the human role in "man-in-loop,,can be replaced by the Al. According to some examples given by the present approach, potential directions for the development of engineering optimization design are discussed. [ABSTRACT FROM AUTHOR]

Copyright of Yingyong Shengtai Xuebao is the property of Chinese Journal of Applied Ecology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Yingyong Shengtai Xuebao is the property of Chinese Journal of Applied Ecology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In order to satisfy the experimental teaching and the specialty of Energy and Environment System Engineering, this paper designed a set of integrated platform of photo-catalytic degradation system. This platform consists of the thermostatic bath,steam generator, light-reactor, control unit, detection system, etc., it can control light intensity, relative humidity, and other reaction conditions during reaction process to ensure a continuous and stable test environment for catalyst activity. The combination of the solar energy and the effective catalysts can degrade VOCs with high efficiency, and their degradation pathways can be analyzed. Integrated with online detection technologies, this system can evaluate the activity, lifetime and poisoning of catalysts, as well as the ultimate photo-degradation results for different catalysts under various conditions. In addition, this platform can conduct comprehensive experiments related to photocatalysis in order to meet the needs of research and teaching. [ABSTRACT FROM AUTHOR]

Based on the computational tasks of the "1st Aeronautics CFD Credibility Workshop (AeCW-1)", the aerodynamic performance analysis of the standard model CHN-T1 is evaluated using the provided structured grid and CFL3D flow solver. The grid convergence results show that the SST turbulence model has better performance than the SA model. The buffet study shows that the interference of shock wave/boundary layer appears from the middle of the wing span, and the shock wave continues to increase its strength with increasing angle of attack. The aft loading decreases rapidly in buffet state, which causes the deterioration of control performance. The elastic deformation mainly effects the strength of shock wave and lift distribution in span direction. Under the condition of large Reynolds number, the aft loading area of the pressure coefficient increases, and the suction platform of pressure coefficient decreases, leading to a low drag coefficient. [ABSTRACT FROM AUTHOR]