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| 1 | Advances on strategies for searching for next generation thermal barrier coating materials显示文摘Thermal barrier coating(TBC) materials play important roles in gas turbine engines to protect the Nibased super-alloys from the high temperature airflow damage. High melting point, ultra-low thermal conductivity, large thermal expansion coefficient, excellent damage tolerance and moderate mechanical properties are the main requirements of promising TBC materials. In order to improve the efficiency of jet and/or gas turbine engines, which is the key of improved thrust-to-weight ratios and the energysaving, significant efforts have been made on searching for enhanced TBC materials. Theoretically, density functional theory has been successfully used in scanning the structure and properties of materials, and at the same time predicting the mechanical and thermal properties of promising TBC materials for high and ultrahigh temperature applications, which are validated by subsequent experiments. Experimentally,doping and/or alloying are also widely applied to further decrease their thermal conductivities. Now, the strategy through combining theoretical calculations and experiments on searching for next generation thermal insulator materials is widely adopted. In this review, the common used techniques and the recent advantages on searching for promising TBC materials in both theory and experiments are summarized. | Bin Liu Yuchen Liu Changhua Zhu Huimin Xiang Hongfei Chen Luchao Sun Yanfeng Gao Yanchun Zhou | 2019 | Journal of Materials Science & Technology2019，35，5： | 24 |
| 2 | Influence of stacking fault energy on formation of long period stacking ordered structures in Mg-Zn-Y-Zr alloys | Fu-sheng PAN~(1,2),Su-qin LUO~1,Ai-tao TANG~(1,2),Jian PENG~(1,2),Yun LU~3 1.College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China 2.National Engineering Research Center for Magnesium Alloys,Chongqing University,Chongqing 400044,China 3.Faculty of Engineering,Chiba University,Chiba 263-8522,Japan | 2011 | Progress in Natural Science:Materials International2011，21，6： | 17 |
| 3 | Dynamic calculation model and seismic response for frame supporting structure with prestressed anchors显示文摘A dynamic calculation model of frame supporting structures with prestressed anchors for the slope stability is proposed. The frame and soil are closely contacted in the role of prestressed anchors and they cannot be separated along the whole slope. The lateral displacement of frame and soil is nearly in phase. The movement characteristic satisfies the theory of elastic foundation beam. The frame is treated with elastic foundation beam in this model. The influence of prestressed anchors is simplified as linear spring and damped system related with velocity. Under the condition of horizontal earthquake excitation, the equation of vibration response is established by using the model of dynamic Winkler beam and the analytical solutions are obtained for simple harmonic vibration. This method is applied to a case record for illustration of its capability, in order to verify the method, 3D nonlinear FEM (ADINA) is used to analyze the seismic performance of this case, the comparative results show that the design and the analysis are safe and credible by using the proposed method. The calculation model provides a new way for earthquake analysis and seismic design of slope stability supported by frame structure with prestressed anchors. | DONG JianHua1’2, ZHU YanPeng1, ZHOU Yong1 & MA Wei2 1 College of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China 2 State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China | 2010 | Science China(Technological Sciences)2010，53，7： | 16 |
| 4 | Optical biometry intraocular lens power calculation using different formulas in patients with different axial lengths显示文摘AIM: To investigate the predictability of intraocular lens (IOL) power calculation using the IOLMaster and different IOL power calculation formulas in eyes with various axial length (AL). METHODS: Patients were included who underwent uneventful phacoemulsification with IOL implantation in the Department of Ophthalmology, Far Eastern Memorial Hospital, Taipei, Taiwan, China from February 2007 to January 2009. Preoperative AL and keratometric values (Ks) were measured by IOLMaster optical biometry. Patients were divided into 3 groups based on AL less than 22mm (Group 1), 22-26mm (Group 2), and more than 26mm (Group 3). The power of the implanted IOL was used to calculate the predicted postoperative spherical equivalence (SE) by various formulas: the Haigis, Hoffer Q, Holladay 1, and SRK/T. The predictive accuracy of each formula was analyzed by comparing the difference between the actual and predicted postoperative SE (MedAE, median absolute error). All the patients had follow-up periods exceeding 3 months. RESULTS: Totally, there were 200 eyes (33 eyes in Group 1, 92 eyes in Group 2, 75 eyes in Group 3). In all patients, the Haigis had the significantly lower MedAE generated by the other formulas (P<0.05). In Group 1 to 3, the MedAE calculated by the Haigis was either significantly lower or comparable to those calculated by the other formulas.CONCLUSION: Compared with other formulas using IOLMaster biometric data, the Haigis formula yields superior refractive results in eyes with various AL. | Jia-Kang Wang Shu-Wen Chang | 2013 | International Journal of Ophthalmology(English edition)2013，6，2： | 16 |
| 5 | 喷管流场及其推力矢量的数值计算显示文摘本文在Euler及Navier Stokes方程的基础上 ,利用三阶ENO差分格式计算了轴对称喷管的流动 ,得到了与实验较一致的结果。计算结果表明 ,对锥形喷管而言 ,在其它条件限定的情况下出现推力极大值的扩张角在 10°和 15°之间 (约在 12 .5°附近 ) ,即存在最佳扩张角。最后利用三维CFD数值计算 。 | 黄振宇 徐文灿 毛鸿羽 | 2000 | 兵工学报2000，21，1： | 12 |
| 6 | Understanding the multifunctionality in Cu-doped BiVO_4 semiconductor photocatalyst显示文摘A visible light-induced, Cu-doped BiVO_4 photocatalyst was synthesized by a microwave hydrothermal method. The photocatalytic efficiency was investigated in the degradation of model water pollutants like Methylene Blue(dye) and ibuprofen(pharmaceuticals), as well as the inactivation of Escherichia coli(bacteria). The Cu-doped BiVO4 samples showed better efficiency than undoped BiVO_4, and the 1 wt.% Cu-doped BiVO_4 sample showed the best efficiency. The degradation of Methylene Blue reached 95%, while the degradation of ibuprofen reached 75%, and the inactivation of E. coli reached 85% in irradiation with visible light. The appearance of additional absorption band shoulders and widening of the optical absorption in the visible range makes the prepared powder an efficient visible light-driven photocatalyst. Moreover, the formation of an in-gap energy state just above the valance band as determined by density functional theory(DFT) first principle calculation, facilitates the wider optical absorption range of the doped system. Similarly, this in-gap energy state also acts as an electron trap, which is favorable for the efficient separation and photoexcited charge carriers' transfer process. The formation of oxygen vacancies due to doping also improved the separation of the charge carrier, which promoted the trapping of electrons and inhibited electron hole recombination, thus increasing the photocatalytic activity. No decrease in the efficiency of the 1 wt.% Cu-doped BiVO_4 photocatalyst in the degradation of ibuprofen over three consecutive cycles revealed the stability of the photocatalyst towards photocorrosion. These findings highlight the multifunctional applications of Cu-doped BiVO_4 in wastewater containing multiple pollutants. | Chhabilal Regmi Yuwaraj K.Kshetri Ramesh Prasad PANDey Tae-Ho Kim Gobinda Gyawali Soo Wohn Lee | 2019 | Journal of Environmental Sciences2019，31，1： | 12 |
| 7 | EXPERIMENTAL INVESTIGATION AND THERMODYNAMIC CALCULATION ON PHASE PRECIPITATION OF INCONEL 740显示文摘A novel nickel-based superalloy INCONEL 740 was under development for application in ultra-supercritical superheater tubers above 750℃. The precipitation behaviors of η phase and γ’ particles of the alloy were investigated through experimental study and phase computation. Experimental results showed that η phase formed a Widmanst?tten pattern structure following long-term exposure at elevated temperatures and that the coarsening of γ’ particle follows a cube rate law:r-3 ∝ t. Thermodynamic calculation results showed that Al and Ti had an important effect on the precipitation behavior of γ’ andη phases. Two suggested novel modified alloys, wherein the Al and Ti contents were modified, were designed and melted for the experimental study. The preliminary results indicated that the modified alloys exhibited higher structural stability following long-term exposure at 750℃ till 5000h. | S.Q. Zhao* Department of Physics, Ningxia University, Yinchuan 750021, China Y. Jiang Department of Materials Science, The Northwest Second Nationalities Institute, Yinchuan 750021, China J.X. Dong and X.S. Xie High Temperature Materials Research Laboratories, University of Science and Technology Beijing, Beijing 100083, China | 2006 | Acta Metallurgica Sinica(English Letters)2006，19，6： | 11 |
| 8 | gt-C3N4 coordinated single atom as an efficient electrocatalyst for nitrogen reduction reaction显示文摘The electrochemical reduction of nitrogen to ammonia is a promising way to produce ammonia at mild condition.The design and preparation of an efficient catalyst with high ammonia selectivity is critical for the real applications.In this work,a series of transition metal (TM =Sc,Ti,V,Cr,Mn,Fe,Co,Ni,Cu,Zn,Y,Zr,Nb,Mo,Tc,Ru,Rh,Pd,Ag,and Cd) atoms supported by gt-C3N4 (TM/gt-C3N4) are investigated as electrocatalysts for the nitrogen reduction reaction (NRR) based on density functional calculations.It is found that Mo/gt-C3N4 with a limiting potential of-0.82 V is the best catalyst for standing-on adsorbed N2 cases.While for lying-on adsorbed N2 cases,V/gt-C3N4 with a limiting potential of-0.79 V is berer than other materials.It is believed that this work provides several promising candidates for the non-noble metal electrocatalysts for NRR at mild condition. | Lifu Zhang Wanghui Zhao Wenhua Zhang Jing Chen Zhenpeng Hu | 2019 | Nano Research2019，12，5： | 11 |
| 9 | Numerical simulation of the blast wave of a multilayer composite charge显示文摘The numerical simulation of a blast wave of a multilayer composite charge is investigated.A calculation model of the near-field explosion and far-field propagation of the shock wave of a composite charge is established using the AUTODYN finite element program.Results of the near-field and far-field calculations of the shock wave respectively converge at cell sizes of 0.25-0.5 cm and 1-3 cm.The Euler--fluxcorrected transport solver is found to be suitable for the far-field calculation after mapping.A numerical simulation is conducted to study the formation,propagation,and interaction of the shock wave of the composite charge for different initiation modes.It is found that the initiation mode obviously affects the shock-wave waveform and pressure distribution of the composite charge.Additionally,it is found that the area of the overpressure distribution is greatest for internal and external simultaneous initiation,and the peak pressure of the shock wave exponentially decays,fitting the calculation formula of the peak overpressure attenuation under different initiation modes,which is obtained and verified by experiment.The difference between numerical and experimental results is less than 10%,and the peak overpressure of both internal and external initiation is 56.12% higher than that of central single-point initiation. | Xiao-wen Hong Wei-bing Li Wei Cheng Wen-bin Li He-yang Xu | 2020 | Defence Technology(防务技术)2020，16，1： | 11 |
| 10 | Study on calculation model of road lighting visibility显示文摘Visibility is an evaluation index for road lighting, which comprehensively influences the vision reliability of drivers and is a key factor for road lighting safety and energy saving. This paper introduces the concept of road lighting visibility and its influencing factors. It also explains the small target visibility calculation model for road lighting design, and describes the significance of establishing urban road lighting visibility standards from a point of view of visual function and visual comfort of drivers. | WENG Ji1, HU YingKui2 & YING Wen1 1College of Architecture and Urban Planning, Chongqing University, Chongqing 400045, China 2College of Civil Engineering, Chongqing University, Chongqing 400045, China | 2010 | Science China(Technological Sciences)2010，53，7： | 10 |
| 11 | Comparison of OA-2000 and IOL Master 500 using in cataract patients with high myopia显示文摘This study was designed to compare optical biometry measurements and predicted refraction in cataract patients with high myopia [axial length(AL) ≥26 mm] using OA-2000 and IOL Master 500. Ocular biometry measurements were performed using both biometers before surgery. Uneventful cataract surgery was performed in all patients. Postoperative manifest refraction was obtained 3 wk after surgery or later. A total of 67 eyes were examined. The AL, keratometry(K), and anterior chamber depth(ACD) of the two biometers showed excellent agreement. Predicted errors were similar and a strong positive correlation was observed(r=0.909). Out of 21 eyes(31.34%) with unsuccessful AL readings using the IOL Master 500, 20 eyes of them could be measured using OA-2000. Therefore, the biometric parameters measured by the two biometers showed good agreement. However, OA-2000 had a lower AL measurement failure rate. | Ya-Li Du Geng Wang Hui-Chun Huang Li-Yu Lin Chuang Jin Li-Fang Liu Xiu-Ru Liu Ming-Zhi Zhang | 2019 | International Journal of Ophthalmology(English edition)2019，12，5： | 10 |
| 12 | Magnetic moments of ^(33)Mg in the time-odd relativistic mean field approach显示文摘The configuration-fixed deformation constrained relativistic mean field approach with time-odd component has been applied to investigate the ground state properties of 33Mg with effective interaction PK1.The ground state of 33Mg has been found to be prolate deformed,β2=0.23,with the odd neutron in 1/2[330] orbital and the energy -251.85 MeV which is close to the data -252.06 MeV.The magnetic moment -0.9134 μN is obtained with the effective electromagnetic current which well reproduces the data -0.7456 μN self-consistently without introducing any parameter.The energy splittings of time reversal conjugate states,the neutron current,the energy contribution from the nuclear magnetic potential,and the effect of core polarization are discussed in detail. | LI Jian1,ZHANG Ying1,YAO JiangMing1 & MENG Jie1,2 1 School of Physics,State Key Laboratory of Nuclear Physics and Technology,Peking University,Beijing 100871,China 2 School of Physics and Nuclear Energy Engineering,Beihang University,Beijing 100191,China | 2009 | Science China(Physics,Mechanics & Astronomy)2009，52，10： | 9 |
| 13 | Research on Flexural Behavior of Coral Aggregate Reinforced Concrete Beams显示文摘Through the flexural behavior test of coral aggregate reinforced concrete beams(CARCB) and ordinary Portland reinforced concrete beams(OPRCB), and based on the parameters of concrete types, concrete strength grades and reinforcement ratios, the crack development, failure mode, midspan deflection and flexural capacity were studied, the relationships of bending moment-midspan deflection, load-longitudinal tensile reinforcement strain, load-maximum crack width were established, and a calculation model for the flexural capacity of CARCB was suggested. The results showed that with the increase in the reinforcement ratio and concrete strength grade, the crack bending moment(Mcr)and ultimate bending moment(Mu) of CARCB gradually increased. The characteristics of CARCB and OPRCB are basically the same. Furthermore, through increasing the concrete strength grade and reinforcement ratio, Mcr/Mu could be increased to delay the cracking of CARCB. As the load increased, crack width(w) would also increase. At the beginning of the loading, w increased slowly. And then it increased rapidly when the load reached to the ultimate load, which then led to beam failure. Meanwhile, with a comprehensive consideration of the effects of steel corrosion on the loss of steel section and the decrease of steel yield strength, a more reasonable calculation model for the flexural capacity of CARCB was proposed. | MA Hai-yan DA Bo YU Hong-fa WU Zhang-yu | 2018 | China Ocean Engineering2018，32，5： | 8 |
| 14 | Dynamic subsidence prediction of ground surface above salt cavern gas storage considering the creep of rock salt显示文摘A new model is proposed to predict the dynamic subsidence of ground surface above salt cavern gas storage during the leaching and storage, which takes into account the creep of rock salt. In the model, the extended form of Gaussian curve is adopted to figure out the shape of subsidence areas. The corresponding theoretical formulas are derived. In addition, parameters are studied to investigate the surface subsidence as a function of the salt ejection rate, internal pressure, buried depth, diameter, height, running time, etc. Through an example, the subsidence of the salt cavern gas storage located at Jiangsu of China obtained by the new model was compared with those by Peter A F formula, Schober & Sroka formula and FLAC3D through simulation. The results showed the proposed model is precise and correct, and can meet the actual engineering demands. The surface subsidence is equidirectional with the increase of salt ejection rate, depth, diameter, height, and running time, but reverse to the increase of internal pressure. The depth, diameter, running time and internal pressure have great effects on the subsidence, whereas the salt ejection rate and height have little influences on it. | WANG TongTao1, YAN XiangZhen1, YANG XiuJuan1 & YANG HengLin2 1 College of Pipeline and Civil Engineering, China University of Petroleum, Qingdao 266555, China 2 CNPC Drilling Research Institute, Beijing 100097, China | 2010 | Science China(Technological Sciences)2010，53，12： | 8 |
| 15 | Research and application of a power-flow-calculation method in multiterminal VSC-HVDC power grid显示文摘For demonstrating a multiterminal voltage-source converter(VSC)-based high-voltage DC(HVDC)(VSCHVDC) project, this study puts forward a technical route for calculating the power flow in a 500-kV VSC-HVDC power grid in comparison with that of an AC power grid. The Jacobian matrix used in the power-flow calculation was deduced through methods such as Newton–Laphson iteration and Taylor series expansion. Further, the operation effect of powerflow calculation on a true bipolar VSC-HVDC power grid was analyzed briefly. The elements of the Jacobian matrix corresponding to VSC were studied under the mode of droop control and the control strategy of VSC-HVDC power grid was analyzed in detail. The power-flow calculation model for VSC-HVDC power grid of the master–slave control mode was simplified using the PQ decomposition method of the power-flow calculation of an AC power grid. Moreover, a four-terminal model of the Zhangbei VSC-HVDC demonstration project was established and tested on MATLAB. The simulation results under two kinds of operating conditions were analyzed and compared to the results of BPA; the deviation between the power-flow results was studied. The results show that the proposed calculation method can provide a feasible support for calculating the power flow in VSC-HVDC grids. | Linlin Wu Xiaowei Fan Man Xu Zhendong Li Xiao Wang Xiaofei Zhang Haiwang Jin | 2019 | Global Energy Interconnection2019，2，1： | 8 |
| 16 | Precipitates and alloying elements distribution in nearαtitanium alloy Ti65显示文摘Precipitates,including silicides and Ti3 Al(α2)phase,and alloying elements distribution in a near a titanium alloy Ti65(Ti-5.8 Al-4.0 Sn-3.5 Zr-0.5 Mo-0.3 Nb-1.0 Ta-0.4 Si-0.8 W-0.05 C)after solution treatment and aging process were characterized by using transmission electron microscopy(TEM)and atom probe tomography(APT).Quantitative composition analysis and TEM observation indicate that the silicides fit to(Ti,Zr)6(Sl,Sn)3.Zr exhibits aβ-stabilizing effect in near a titanium alloys but is weaker than otherβstabilizing elements.The enriching tendency of the alloying elements in the retainedβphase is in the order of Zr | Ke Yue Jianrong Liu Haijun Zhang Hui Yu Yuanyuan Song Qingmiao Hu Qingjiang Wang Rui Yang | 2020 | Journal of Materials Science & Technology2020，36，1： | 8 |
| 17 | THE NUMERICAL COMPUTATION OF TURBULENT FLOW IN TEE-JUNCTION显示文摘A numerical model for calculating the turbulent flow in tee-junction is given in thispaper.The calculations are performed using a finite-difference procedure,and turbulence is ac-counted for by using a two-equation k-ε model of turbulence.Results,consisting of mean veloci-ty profiles and pressure losses due to the junction,have been obtained,and show that the flowsituation in tee-junction is very complex.The computed results agree closely with the experimen-tal data and validate that the present model is reasonable and the numerical calculations are suc-cessful. | Chen Hong-bo Lian Gui-sheng Dept.of Mechanics,Zhejiang University,Hangzhou 310027,P.R.China | 1992 | Journal of Hydrodynamics1992，4，3： | 7 |
| 18 | A Real-Time and Ubiquitous Network Attack Detection Based on Deep Belief Network and Support Vector Machine显示文摘In recent years, network traffic data have become larger and more complex, leading to higher possibilities of network intrusion. Traditional intrusion detection methods face difficulty in processing high-speed network data and cannot detect currently unknown attacks. Therefore, this paper proposes a network attack detection method combining a flow calculation and deep learning. The method consists of two parts: a real-time detection algorithm based on flow calculations and frequent patterns and a classification algorithm based on the deep belief network and support vector machine(DBN-SVM). Sliding window(SW) stream data processing enables real-time detection, and the DBN-SVM algorithm can improve classification accuracy. Finally, to verify the proposed method, a system is implemented.Based on the CICIDS2017 open source data set, a series of comparative experiments are conducted. The method's real-time detection efficiency is higher than that of traditional machine learning algorithms. The attack classification accuracy is 0.7 percentage points higher than that of a DBN, which is 2 percentage points higher than that of the integrated algorithm boosting and bagging methods. Hence, it is suitable for the real-time detection of high-speed network intrusions. | Hao Zhang Yongdan Li Zhihan Lv Arun Kumar Sangaiah Tao Huang | 2020 | IEEE/CAA Journal of Automatica Sinica2020，7，3： | 7 |
| 19 | CALCULATION OF VALENCE ELECTRON STRUCTURE IN L_2~'-TYPE COMPLEX SOLID SOLUTIONS显示文摘Based on the empirical electron theory of solids and molecules of S. H. Yu, this paper proposes (i) the calculating model of valence electron structures in L2’-type substitutional and interstitial complex solid solutions; (ii) the bond length difference analysis (BLD) method of unknown bond length structure solid solutions; (iii) the treatment of uncertainty of BLD analysis solution. | 刘志林 戴天时 杨双良 张瑞林 | 1989 | Science China Mathematics1989，32，11： | 6 |
| 20 | Thermodynamic calculation on the smelting slag of direct recycling of electric arc furnace stainless steelmaking dust显示文摘Thermodynamic calculation on the smelting slag of direct recycling of electric arc furnace stainless steelmaking dust was presented. An induction furnace was used to simulate electric arc furnace smelting to recover the metals from the dust. The elements of iron, chromium and nickel in the ingot and the components of metal oxides in the slag were analyzed. The thermodynamic model for FeO Cr 2O 3 MgO SiO 2 slag was set up and the active concentrations of substances in the slag at 1 550 ℃ were determined by thermodynamic calculation according to the experimental data. The results show that the apparent equilibrium constant and quantitative distribution of chromium between slag and steel are unstable and affected by the mass ratios of pellets to start iron and metal reducing agent to the pellets. In order to get satisfactory chromium recovery from the direct recycling of electric arc furnace stainless steelmaking dust, it is important to ensure the mass ratio of pellets to the steel below 0.20 and the mass ratio of metal reducing agent to pellets over 0.18 in practical smelting runs. | 彭兵 彭及 Janusz A.Kozinski Jonathan Lobel 柴立元 张传福 陈为亮 | 2003 | Journal of Central South University of Technology2003，10，1： | 6 |
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