检索结果-南通市图书馆

Hydrochemical characteristics and the ecological effect of algal carbonic anhydrase in carbon cycle in the Taiyuan section of Fenhe River

在线全文

学校读者我要写书评

暂无评论

Journal of Oceanology and Limnology 2024年第5期42卷 1507-1524页

作者： Jing YANg xin LI Shulian XIE jia FENg Shanxi Key Laboratory of Yuncheng Salt Lake Ecological Protection and Resource Utilization College of Life SciencesYuncheng UniversityYuncheng 044000China School of Life Science Shanxi UniversityTaiyuan 030006China

Water scarcity and pollution pose a threat to the sustainable development of cities and ***,it is crucial to analyze the hydrochemical characteristics and carbon dynamics of waterdeficient *** the Taiyuan section of Fenhe River as the research object,we systematically explored the hydrochemical characteristics of surface water and its evolutionary processes,as well as the ecological effect of algal carbonic anhydrase in carbon cycle using the hydrochemical evolution method and correlation *** ternary diagram demonstrates that the main water chemical type in Fenhe River was SO^(2-)_(4)·Cl^(-)-Na^(+).The gibbs and end-member diagrams of each ion display that the chemical composition of surface water was mainly controlled by silicate *** chemical ions originated mainly from dissolution of some minerals,such as plagioclase,halite,dolomite,calcite,and *** diatoms had a lower CO_(2)requirement because they exhibited a higher abundance at a lower partial pressure of CO_(2)(p CO_(2)).However,high CO_(2)concentration had a positive effect on cyanobacteria,which reduced the active transport of HCO_(3)^(-),saved the energy needed for this part of active transport,and indirectly improved the overall photosynthetic efficiency of *** anhydrase(CA)activity was significantly negatively correlated with p CO_(2)and positively correlated with HCO_(3)^(-)concentration,indicating that CA in water promoted the conversion of CO_(2)to HCO_(3)^(-).The HCO_(3)^(-)generated from this process continued to participate in the erosion of silicate rocks,sequestering CO_(2)in the form of Ca CO_(3),which has a non-negligible impact on the carbon sink in the Fenhe *** consequences may have important implications for the biogeochemical cycling occurring in urban water.

关键词： hydrochemistry inorganic carbon phytoplankton community carbonic anhydrase Fenhe River

Reduction of chromium oxides in stainless steel dust

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2015年第6期22卷 573-581页

作者： Yan-ling Zhang Wen-ming guo xin-lei jia State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing

The recovery of metal oxides from stainless steel dust using C（graphite）, SiFe, and Al as reductants was investigated under various conditions. The apparent distribution ratio of Cr（L Cr ′^m/s ） in the recovered metal and residual slag phases was defined as the major performance metric. The results show that the recovery ratio of metals increases as the ratio of CaO ：SiO2 by mass in the residual slag increases to 1.17. The residual content of metals in the slag decreases as the Al2O3 content of the slag is increased from approximately 8wt% to 10wt%. The recovery ratio of Cr increases with increasing L Cr ′^ m/s , and a linear relationship between L Cr ′^m/s and the activity coefficient ratio of CrO in the slag and the recovered metal phase is observed. The combination of C and SiFe or Al as the reducing agents reveals that Si is the more effective coreductant.

关键词： stainless steel dust chromium oxides recovery apparent distribution ratio activity coefficient

Effect of strain rate on fracture behaviour of Cr18Ni11Ti stainless steel at high temperatures

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2022年第6期29卷 1004-1011页

作者： xin-li Song Chang-hu Huang Juan jia Jing Liu The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081HubeiChina Hubei Engineering Technology Research Center of Marine Materials and Service Safety Wuhan 430081HubeiChina

The effect of strain rate on the fracture behaviour of Cr18Ni11Ti stainless steel at high temperatures was *** steel was subjected to solid solution treatment at 1050°C and ageing at 650°C for 24 *** high-temperature tensile properties of Cr18Ni11Ti stainless steel were subsequently investigated via high-temperature tensile testing at 650°C and different strain rates(1.43×10^(–1),1.43×10^(–2),1.43×10^(–3),1.43×10^(–4),and 1.43×10^(–5) s^(–1)).The microstructure,precipitated phase,tensile fracture surface,and dislocation of the experimental steel were analysed by scanning electron microscopy,transmission electron microscopy and energy *** results show that Cr18Ni11Ti stainless steel is mainly austenite,with a large number of twin crystals,chromium-rich precipitated phase and composite precipitated phases of TiC and *** decreases in strain rate,the yield strength,ultimate tensile strength,and reduction in area also *** the strain rate is high,obvious necking and ductile fracture occur in the experimental ***,when the strain rate is reduced to 1.43×10^(–5) s^(–1),the necking phenomenon is not obvious and intergranular brittle fracture *** segregation of P and S contents at grain boundaries,or dislocation motion creep and grain-boundary sliding creep,leads to brittle fracture of the steel at lower strain rates of 1.43×10^(–4) to 1.43×10^(–5) s^(–1).

关键词： Stainless steel Strain rate High-temperature mechanical property grain boundary segregation Dislocation

Analysis model for damage of reinforced bars in RC beams under contact explosion

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2024年第11期41卷 104-118页

作者： Chaozhi Yang Zhengxiang Huang xin jia Wei Shang jian Zhang The 716th Research Institute China State Shipbuilding Corporation LimitedLianyungang222006China School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing210094China Hua'an Industry group Ltd Qiqihar161006China

The load-bearing capacity of reinforced concrete(RC) beams primarily relies on internal reinforced ***, limited research has been conducted on the dynamic response of these bars. To address this gap, this study has established an analytical model using dimensional analysis for calculating the deformation of reinforced bars within RC beams subjected to contact explosion. Comparison with experimental data reveals that the model has a relative error of 5.22%, effectively reflecting the deformation of reinforced bars. Additionally, based on this model, the study found that while concrete does influence the deformation of reinforced bars, this influence can be disregarded in comparison to the material properties of the bars themselves. The findings of this study have implications for calculating the residual load-bearing capacity of damaged RC beams, evaluating the extent of damage to RC beams after blast loading, and providing guidance for the blast-resistant design of RC structures.

关键词： Reinforced concrete beam Contact explosion Reinforced bar Damage analysis Residual load-bearing capacity

A fabrication method for adaptive dielectric gradient insulating components

在线全文

学校读者我要写书评

暂无评论

High Voltage 2023年第1期8卷 59-69页

作者： Zikui Shen Zhidong jia Yanpeng Hao Zhenyu xin Xilin Wang School of Electric Power Engineering South China University of TechnologyGuangzhouChina Shenzhen International graduate School(SIgS) Tsinghua UniversityShenzhenChina

Dielectric gradient components have advantages in electric field mitigation and insulation *** this paper,we propose a fabrication method for adaptive dielectric gradient components using in situ AC electric field,including the mechanism and the corresponding operational procedures for industrial *** on the electric polarisation and self-assembly effect of the filler particles in the liquid matrix,the chainlike structure in the high field strength region is constructed to enhance the local permittivity and mitigate the maximum of the spatial electric *** dielectric gradient basin insulator is prepared by this method,and its flashover voltage is increased by 12.8%compared with that of a homogeneous dielectric basin insulator,and the improvement is 20.8%when metal particles are present on the *** more non-uniform the initial electric field is,the greater the improvement in flashover *** method is expected to promote the industrial application of dielectric gradient insulating components.

关键词： dielectric gradient method

Axial compression behavior of CFRP-confined rectangular concrete-filled stainless steel tube stub column

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Structural and Civil Engineering 2021年第5期15卷 1144-1159页

作者： Hongyuan TANg Ruizhong LIU xin ZHAO Rui gUO Yigang jia Institute of Structural Engineering Xihua UniversityChengdu 610039China Institute of Design and Research Nanchang UniversityNanchang 330029China

The mechanical properties of CFRP-confined rectangular concrete-filled stainless steel tube(CFSST)stub columns under axial compression were experimentally studied.A total of 28 specimens(7 groups)were fabricated for the axial compression test to study the influences of length-to-width ratio,CFRP constraint coefficient,and the thickness of stainless steel tube on the axial compression *** specimen failure modes,the stress development of stainless steel tube and CFRP wrap,and the load-strain ratio curves in the loading process were ***,the relationship between axial and transverse deformations of each specimen was analyzed through the typical relative load-strain ratio curves.A bearing capacity prediction method was proposed based on the twin-shear strength theory,combining the limit equilibrium state of the CFRP-confined CFSST stub column under axial *** prediction method was calibrated by the test data in this study and other *** results show that the prediction method is of high accuracy.

关键词： CFRP rectangular CFSST stub column bearing capacity limit equilibrium state twin-shear strength theory

Low-complexity iterative equalization for OTFS based on alternating minimization

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2023年第4期34卷 851-860页

作者： HE xin jia Haoxiang SUN Yutong ZHOU Zijian ZHAO Danfeng School of Information and Communication Engineering Harbin Engineering UniversityHarbin 150001China

To achieve robust communication in high mobility scenarios,an iterative equalization algorithm based on alternating minimization(AM)is proposed for the orthogonal time frequency space(OTFS)*** algorithm approximates the equalization problem to a convex function optimization problem in the real-valued domain and solves the problem iteratively using the AM *** the iterative process,the complexity of the proposed algorithm is reduced further based on the study of the cyclic structure and sparse property of the OTFS channel matrix in the delay-Doppler(DD)*** new method for OTFS is simulated and verified in a high-speed mobile scenario and the results show that the proposed equalization algorithm has excellent bit error rate performance with low complexity.

关键词： orthogonal time frequency space(OTFS) alternating minimization(AM) high-speed mobile scenario iterative equalization

Progress of hidden spin polarization in inversion-symmetric crystals

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2022年第3期65卷 1-18页

作者： Shan guan jia-xin Xiong Zhi Wang Jun-Wei Luo State Key Laboratory of Superlattices and Microstructures Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Beijing Academy of Quantum Information Sciences Beijing 100193China

Hidden spin polarization refers to that doubly degenerate bands protected by combined inversion and time-reversal symmetry in nonmagnetic inversion-symmetric crystals could have opposite non-zero local spin polarizations, which are spatially separated in two real-space sectors paired by the inversion symmetry. Since its first prediction from ab initio calculation, hidden spin polarization has inspired tremendous interest and has been observed experimentally due to its intriguing fundamental properties as well as the great potential for applications. Moving forward, the search for moment-dependent spin splitting has also been extended to antiferromagnets even without considering spin-orbit coupling. This paper systematically reviews recent works in this field with a focus on basic concepts and material realization. It also details several remaining bottlenecks and suggests possible avenues for future research.

关键词： spin-orbit coupling hidden spin polarization tight-binding model ab initio calculation

Tumor-microenvironment activated programmable synergistic cancer therapy by bioresponsive rare-earth nanocomposite

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2022年第9期40卷 1399-1406,I0003页

作者： Qi jia xin Han Yuxin Liu Xianquan Liao Jing Zhou Capital Normal University Beijing 100048China

Synergistic chemotherapy-photothermal therapy(CT-PTT)can improve the cancer treatment efficacy,but its treatment effect is still limited by factors such as targeting efficiency and treatment ***,a H_(2)S-responsive metal organic frameworks(MOFs)coated rare-earth nanocomposite(csEr@-MOF)was constructed and loaded with a chemotherapeutic drug(DOX)and a heat shock protein(HSP)inhibitor(Shepherdin).As the drug-loaded csEr@MOF reaches the H_(2)S-riched colorectal tumor region,based on the reaction between H_(2)S and MOF,Shepherdin is released for inhibiting the function of HSPs,the generated CuS is used for PTT and DOX is released for *** being monitored by ratiometric imaging of rare-earth nanocomposite,it is possible to perform the precise treatment timing for *** the help of Shepherdin,the treatment effect of PTT was ***,programmable CT-PTT synergistic cancer therapy activated by a single H_(2)S trigger is achieved in vitro and in *** work provides new ideas for designing tumor microenvironment-responsive therapeutic agents for programmable synergistic therapy with better targeting and therapeutic efficiency.

关键词： Rare-earth nanocomposite Tumor microenvironment Hydrogen sulfide Synergistic therapy Programmable therapy