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Tuning nitrogen defects and doping sulfur in carbon nitride for enhanced visible light photocatalytic activity

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Frontiers of Chemical Science and engineering 2023年第1期17卷 93-101页

作者： Huilin Xu Xiangfeng Peng Jingxuan Zheng Zhao Wang National engineering research center of Industry Crystallization Technology School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China

Defect construction and heteroatom doping are effective strategies for improving photocatalytic activity of carbon nitride(g-C_(3)N_(4)).In this work,N defects were successfully prepared via cold ***-energy electrons generated by plasma can produce N defects and embed sulfur atoms into g-C_(3)N_(4).The N defects obviously promoted photocatalytic degradation performance that was 7.5 times higher than that of pure g-C_(3)N_(4).The concentration of N defects can be tuned by different power and time of *** the increase in N defects,the photocatalytic activity showed a volcanic *** g-C_(3)N_(4)with moderate concentration of N defects exhibited the highest photocatalytic activity.S-doped g-C_(3)N_(4)exhibited 11.25 times higher photocatalytic activity than pure g-C_(3)N_(4).It provided extra active sites for photocatalytic reaction and improved stability of N *** N vacancy-enriched and S-doped g-C_(3)N_(4)are beneficial for widening absorption edge and improving the separation efficiency of electron and holes.

关键词： g-C_(3)N_(4) nitrogen defect sulfur doping photodegradation plasma

Influence of reaction piles on test pile response in a static load test

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Journal of Zhejiang University-Science A(Applied Physics & engineering) 2013年第3期14卷 198-205页

作者： Qian-qing ZHANG Shu-cai LI Zhong-miao ZHANG Geotechnical and Structural engineering research center Shandong University MOE Key Laboratory of Soft Soils and Geoenvironmental engineering Zhejiang University

This work presents a new analytical method to analyze the influence of reaction piles on the test pile response in a static load *** our method,the interactive effect between soil and pile is simulated using independent springs and the shear displacement method is adopted to analyze the influence of reaction piles on test pile ***,the influence of the sheltering effect between reaction piles and test pile on the test pile response is taken into *** cases are analyzed to verify the rationality and efficiency of the present *** method can be easily extended to a nonlinear response of an influenced test pile embedded in a multilayered soil,and the validity is also demonstrated using centrifuge model tests and a computer program presented in the *** present analyses indicate that the proposed method will lead to an underestimation of the test pile settlement in a static load test if the influence of the presence of reaction piles on the test pile response is neglected.

关键词： Test pile Reaction pile Shear displacement method Sheltering effect Multilayered soil

On-chip integrated few-mode erbium–ytterbium co-doped waveguide amplifiers

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Photonics research 2024年第5期12卷 1067-1077页

作者： XIWEN HE DEYUE MA CHEN ZHOU MINGYUE XIAO WEIBIAO CHEN ZHIPING ZHOU Aerospace Laser Technology and Systems Department Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China center of Materials Science and Optoelectronics engineering University of Chinese Academy of SciencesBeijing 100049China School of Physical Sciences University of Science and Technology of ChinaHefei 230026China School of Microelectronics Shanghai UniversityShanghai 201800China State Key Laboratory of Advanced Optical Communications Systems and Networks School of ElectronicsPeking UniversityBeijing 100871China

We propose for the first time,to the best of our knowledge,an on-chip integrated few-mode erbium–ytterbium co-doped waveguide amplifier based on an 800 nm thick Si_(3)N_(4)platform,which demonstrates high amplification gains and low differential modal gains(DMGs)*** eccentric waveguide structure and a co-propagating pumping scheme are adopted to balance the gain of each mode.A hybrid mode/polarization/wavelengthdivision(de)multiplexer with low insertion loss and crosstalk is used for multiplexing and demultiplexing in two operation wavebands centered at 1550 nm and 980 nm,where the light in these two bands serves as the signal light and pump light of the amplifier,*** results demonstrate that with an input signal power of 0.1 mW,TE_(0)mode pump power of 300 mW,and TE_(1)mode pump power of 500 m W,the three signal modes(TE_(0)∕TM_(0)∕TE_(1))all exhibit amplification gains exceeding 30 dB,while maintaining a DMG of less than 0.1 dB.

关键词： waveguide pump amplifier

Relationship between heat treatment and corrosion behaviour of Mg-3.0%Nd-0.4%Zr magnesium alloy

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中国有色金属学会会刊：英文版 2007年第6期17卷 1152-1157页

作者：常建卫郭兴伍付彭怀彭立明丁文江 National engineering research center of Light Alloys Net Forming School of Materials Science and EngineeringShanghai Jiao Tong University

The corrosion behaviour of Mg-3.0Nd-0.4Zr (NK30) magnesium alloy was investigated in as-cast (F), solution treated (T4) and peak-aged (T6) conditions in 5% NaCl solution by immersion tests and electrochemical measurements. The results of immersion test show that NK30 alloy exhibits better corrosion resistance in F condition than it does in the other two conditions due to the more compact corrosion film formed on alloy in F condition. The potentiodynamic polarization curves show that the overpotential of cathodic hydrogen evolution reaction on NK30-F is much higher than that on NK30-T4 and NK30-T6. The corrosion potentials of NK30 increase in the following order: F

关键词： Mg-Nd-Zr合金腐蚀热处理电动位极化电气化学

Prediction of Cold Dwell-Fatigue Crack Growth of Titanium Alloys

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Acta Metallurgica Sinica(English Letters) 2015年第5期28卷 619-627页

作者： Ke Wang Fang Wang Wei-Cheng Cui A.-Li Tian School of Naval Architecture and Ocean engineering Shanghai Jiao Tong University Hadal Science and Technology research center (Shanghai engineering research center of Hadal Science and Technology) Shanghai Ocean University School of Naval Architecture and Ocean engineering Jiangsu University of Science and Technology

The dwell effect of the material can reduce the fatigue lives of titanium alloys at room temperature. A unified fatigue life prediction method developed by the authors＇ group is modified in this paper to predict dwell-fatigue crack growth taking into account the effects of dwell time and maximum stress. The modified model can be successfully used to predict the crack growth rate and calculate the fatigue life of different titanium alloys under pure fatigue and dwell-fatigue conditions. It is validated by comparing prediction results with the experimental data of several titanium alloys with different microstructures, dwell time, hydrogen contents, stress ratios and stress levels.

关键词： Titanium alloy Dwell-fatigue Fatigue Crack growth

Numerical simulation on electromagnetic field,flow field and temperature field in semisolid slurry preparation by A-EMS

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Rare Metals 2010年第6期29卷 635-641页

作者： ZHANG Zhifeng,CHEN Xingrun,XU Jun,and SHI Likai National engineering & Technology research center for Nonferrous Metal Matrix Composites,General research Institute for Nonferrous Metals,Beijing 100088,China National engineering & Technology research center for Nonferrous Metal Matrix Composites General Research Institute for Nonferrous Metals Beijing China

A two-dimensional computational model coupling an annular electromagnetic stirring（A-EMS） with a macroscopic heat and fluid flow analysis in Al-alloys semisolid slurry preparation was *** dynamic evolutions of the electromagnetic field,flow field,and temperature field were presented successfully by commercial software ANSYS 10.0 with corresponding experimental verification.A horizontally rotational electromagnetic field and,thereby,a more intensive velocity field were uniformly distributed in the stirred melt even at commercial frequency,and thus,a lower temperature difference in the stirred melt and subsequent uniformly fine microstructures were obtained compared with the normal electromagnetic *** simulation results were in good agreement with experimental ones.

关键词： metal forming electromagnetic stirring numerical analysis semisolid slurry

Prescreening of large-effect markers with multiple strategies improves the accuracy of genomic prediction

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Journal of Integrative Agriculture 2024年第5期23卷 1634-1643页

作者： Keanning Li Bingxing An Mang Liang Tianpeng Chang Tianyu Deng Lili Du Sheng Cao Yueying Du Hongyan Li Lingyang Xu Lupei Zhang Xue Gao Junya LI Huijiang Gao Laboratory of Molecular Biology and Bovine Breeding Institute of Animal SciencesChinese Academy of Agricultural SciencesBeijing 100193China Shaanxi Key Laboratory of Molecular Biology for Agriculture College of Animal Science and TechnologyNorthwest A&F UniversityYangling712100China College of Computer and Information engineering Tianjin Agricultural UniversityTianjin 300384China College of Animal Science and Technology Qingdao Agricultural UniversityQingdao 266109China Tongliao Animal Agriculture Development Service center Tongliao 028000China

Presently,integrating multi-omics information into a prediction model has become a ameliorate strategy for genomic selection to improve genomic prediction ***,we set the genomic and transcriptomic data as the training population data,using BSLMM,TWAS,and eQTL mapping to prescreen features according to |β_(b)|>0,top 1%of phenotypic variation explained(PVE),expression-associated single nucleotide polymorphisms(eSNPs),and egenes(false discovery rate(FDR)<0.01),where these loci were set as extra fixed effects(named GBLUP-Fix)and random effects(GFBLUP)to improve the prediction accuracy in the validation population,*** results suggested that both GBLUP-Fix and GFBLUP models could improve the accuracy of longissimus dorsi muscle(LDM),water holding capacity(WHC),shear force(SF),and pH in Huaxi cattle on average from 2.14 to 8.69%,especially the improvement of GFBLUP-TWAS over GBLUP was 13.66%for *** methods also captured more genetic variance than *** study confirmed that multi-omics-assisted large-effects loci prescreening could improve the accuracyofgenomic prediction.

关键词： multi-omics data features prescreening eQTL mapping Huaxi cattle genomic selection

An analytical approach to modeling stress-strain relationship of particle-reinforced metal matrix composites

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Rare Metals 2022年第11期41卷 3903-3910页

作者： Zhao-Bing Xiang Jun-Hui Nie Shao-Hua Wei Tao Zuo Jian-Zhong Fan National engineering Technology research center for Nonferrous Metals Composites General Research Institute for Nonferrous MetalsBeijing100088China

An analytical model was established to simulate the stress-strain curves of particle-reinforced metal matrix composites by the classical stress equilibrium equation and secant modulus method,where particle cracking and matrix tearing were taken into *** stress-strain curves of the composites predicted by the model fit the experimental curves very *** stressstrain relationship of the matrix affected by the particles is predicted exactly,and it is found that the yield stress of the matrix is influenced obviously by the particle *** yield strength of the composites is also predicted by the model,and the results fit the experimental data very well.

关键词： Strengthening mechanism Yield strength Particle fracture Matrix stress-strain curve

Mechanism and Improvement of Straight Edge Seam Defect on Hot-rolled Plate Surfaces through Use of Chamfered Slabs

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Journal of Iron and Steel research International 2016年第6期23卷 539-546页

作者： Hui ZHANG Peng HU Ming-lin WANG National engineering and research center for Continuous Casting Technology Central Iron and Steel Research Institute School of Metallurgy Northeastern University

To improve the straight edge seam defect on hot-rolled steel plates,the deformation and temperature distribution of rectangular slabs and chamfered slabs during rolling in a pilot rolling experiment were analyzed in detail using the finite element *** results showed that the crease formed on the lateral side near the edge of the plate as a result of uneven stress during broadside *** creases rose to the surface with unrestricted spread and evolved into a straight edge seam during the subsequent straight *** eliminate the straight edge seam defect,chamfered slabs were developed and investigated for *** use of the chamfered slabs provided two advantages for rolling：the distribution of the temperature near the edge was ameliorated,and the deformation shape was improved by the chamfered *** a result,the risk of forming a straight edge seam defect was reduced by the use of a chamfered slab.

关键词： straight rolled rolling eliminate subsequent corner rectangular defects crease tensile