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Geosynthetics used to stabilize vegetated surfaces for environmental sustainability in civil engineering

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Frontiers of Structural and Civil Engineering 2017年第1期11卷 56-65页

作者： Jie HAN jun guo Department of Civil Environmental and Architectural Engineering the University of Kansas Lawrence KS 66044 USA

Geosynthetics, factory-manufactured polymer materials, have been successfully used to solve many geotechnical problems in civil engineering. Two common applications are earth stabilization and erosion control. Geosynthetics used for earth stabilization include but are not limited to stabilized slopes, walls, embankments, and roads. Geosynthetics used for erosion control are mostly related to slopes, river channels and banks, and pond spillways. To enhance environmental sustainability, vegetation has been increasingly planted on the facing or surfaces of these earth structures. Under such a condition, geosynthetics mainly function as surficial soil stabilization while vegetation provides green appearance and erosion protection of earth surfaces. Recently, geosynthetic or geosynthetic-like material has been used to form green walls outside or inside buildings to enhance sustainability. Geosynthetics and vegetation are often integrated to provide combined benefits. The interaction between geosynthetics and vegetation is important for the sustainability of the earth and building wall surfaces. This paper provides a review of the current practice and research in the geosynthetic stabilization of vegetated earth and building surfaces for environmental sustainability in civil engineering with the emphases on geosynthetic used for erosion protection, geosynthetic-stabilized slopes, geosynthetic-stabilized unpaved shoulders and parking lots, and geosynthetic-stabilized vegetated building surfaces.

关键词： erosion geosynthetic stabilization sustainability vegetation

Thoughts and Approaches of Integrated Chinese and Western Medicine for the Treatment of Oligo-astheno-teratozoospermia

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Chinese Journal of Integrative Medicine 2018年第7期24卷 483-486页

作者： guo jun Department of Andrology Xiyuan Hospital China Academy of Chinese Medical Sciences

Oligo-astheno-teratozoospermia（OAT） which perplexes doctors and patients due to its complicated etiology, atypical symptoms and poor clinical efficacy, is a general term for the three pathological states of abnormal semen. OAT is the main factor of male infertility. It is also a hot and difficult point in present studies. Empiric drug is the most popular treatment of this disease in the modern medicine. Chinese medicine（CM） is one of the main methods for the treatment of this disease, and it has certain clinical effect. The author believes that the use of modern medical technology to make the diagnosis as clear as possible is the key to treat OAT. The combination of syndrome and disease differentiation is the main mode in the treatment of OAT. Microscopic syndrome differentiation and macroscopic evidence embodies the basic principle of ＂Si Wai Chuai Nei＂ and broadens the perspective of CM syndrome differentiation. Classification and treatment are basic methods for the treatment of OAT. The treatment should not be limited to the Shen（Kidney）, instead it should focus on the whole body condition. At different stages, the treatment should also pay attention to strengthening the Pi（Spleen）, nourishing the Gan（Liver） and promoting blood circulation. Complementing Chinese and Western medicine, and highlighting the characteristics and advantages of CM treatment, have a great guiding value for the treatment of OAT.

关键词： Oligo-astheno-teratozoospermia integrated Chinese and Western medicine dialectical treatment

On a Class of Two-Dimensional Projectively Flat Finsler Metrics with Constant Flag Curvature

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Acta Mathematica Sinica,English Series 2013年第5期29卷 959-974页

作者： guo jun YANG Department of Mathematics Sichuan University

In this paper, we study a special class of two-dimensional Finsler metrics defined by a Riemannian metric and 1-form. We classify those which are locally projectively flat with constant flag curvature.

关键词： (α β)-Metric projectively flat constant flag curvature

Weakly Algebraic Ideal Topology of Effect Algebras

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Acta Mathematica Sinica,English Series 2015年第5期31卷 787-796页

作者： Qing jun LUO guo jun WANG School of Statistics Xi'an University of Finance and Economics School of Mathematics and Information Shaanxi Normal University

In this paper, we show that every weakly a uniform topology （weakly algebraic ideal topology, algebraic ideal of an effect algebra E induces for short） with which E is a first-countable, zero-dimensional, disconnected, locally compact and completely regular topological space, and the operation ＋ of effect algebras is continuous with respect to these topologies. In addition, we prove that the operation - of effect algebras and the operations A and V of lattice effect algebras are continuous with respect to the weakly algebraic ideal topology generated by a Riesz ideal.

关键词： Effect algebra weakly algebraic ideal uniform topology continuity

Perturbation of Spectra for a Class of 2×2 Operator Matrices

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Acta Mathematicae Applicatae Sinica 2012年第4期28卷 711-720页

作者： ALATANCANG guo-lin HOU guo-jun HAI School of Mathematical Sciences Inner Mongolia University

In this paper, we study the perturbation of spectra for 2 ×2 operator matrices such as Mx ={A0 XB） AC and Mz = （Az CB） on the Hilbert space H K and the sets……

关键词： operator matrices point spectrum residual spectrum continuous spectrum perturbation ofspectrum

Competition between Buneman and Langmuir Instabilities

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Chinese Physics Letters 2012年第3期29卷 146-149页

作者： guo jun YU Bin College of Mathematics and Physics Qingdao University of Science and TechnologyQingdao 266061 Key Laboratory of Geospace Environment University of Science and Technology of ChinaHefei 230026

The electron-ion beam instabilities are studied by one-dimensional electrostatic particle-in-cell *** simulation results show that both the low-frequency Buneman mode and high-frequency Langmuir wave(LW)are excited in the nonlinear *** power of Buneman instability is stronger than that of the *** Buneman instability is firstly *** the backward LW appears,which is probably excited by the particles trapped in the wave potential and moving opposite to the original beam *** some time,the forward LW can be found,which has a larger maximum frequency than that of the backward *** the decrease of the electron drift velocity,the instabilities become weaker;the LW appears to have almost equal intensities and becomes symmetric for forward and backward propagation *** LW can also heat the electron,so the relative drift speed cannot far exceed the electron thermal speed,which is not helpful to the development of Buneman instability.

关键词： backward excited beam

Experimental Study on Wear and Spalling Behaviors of Railway Wheel

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Chinese Journal of Mechanical Engineering 2013年第6期26卷 1243-1249页

作者： WANG Wenjian guo jun LIU Qiyue Tribology Research Institute Southwest Jiaotong University

The current researches of the wear and spalling behaviors of wheel/rail materials focus on the field investigation rather than the mechanism. However, it is necessary and significant for clarifying the mechanism and relationship between the wear and spalling damage of railway wheel to test and reproduce the wheel damages in laboratory. The objective of this paper is to investigate the wear and spalling damage behaviors of railway wheel using a JD-1 wheel/rail simulation facility, which consists of a small wheel serving as rolling stock wheel, and a larger wheel serving as rail. The damage process of wheel roller is explored in terms of the creep ratio, axle load, and carbon content by means of various microscopic examinations. The experimental results show that the wear volume growth of wheel roller is proved to be proportional to the increase of the creep ratio and normal load between simulating wheel and rail. The increase of carbon content of wheel material causes a linear reduction in the wear volume. The microscopic examinations indicate that the rolling wear mechanism transfers from abrasive wear to adhesive and fatigue wear with an increase of tangential friction force, which results in the initiation of fatigue crack, and then aggravates spalling damage on the wheel roller surface. The surface hardness of material depends strongly upon its carbon content. The decrease of the carbon content of wheel material may alleviate spalling damage, but can cause a significant growth in the wear volume of wheel roller. Therefore, there is a competitive relationship between the wear and spalling damage of wheel material. This research proposes an important measure for alleviating or preventing the wear and spalling damage of railway wheel material.

关键词： wear spalling content carbon railway wheel wear mechanism

In situ anchoring in carbon matrix of Bi_(2)O_(2)CO_(3) as a high-performance anode material for Li-ion batteries

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Rare Metals 2024年第8期43卷 3634-3646页

作者： Pu-Qiang He jun guo Hui Huang Zhong-Cheng guo Faculty of Metallurgy and Energy Engineering Kunming University of Science and TechnologyKunming 650093China Research Center of Metallurgical Electrode Materials Engineering Technology Kunming 650106China Kunming Hendera Science and Technology Co. Ltd.Kunming 650106China

Bismuth-based anode materials have been regarded as promising Li-ion batteries due to their high theoretical ***,their low conductivity and associated volume expansion inhabited their *** this work,Bi_(2)O_(2)CO_(3)@C composites were successfully synthesized by in situ anchoring of flower-like Bi_(2)O_(2)CO_(3) nanosheets on a carbon-based substrate via *** unique composited structure of Bi_2O_(2)-CO_(3)@C leads to a stable specific capacity of 547 mAh·g^(-1)after 100 cycles at a current density of 0.1 A·g^(-1).Notably,it demonstrates excellent rate capability with a specific capacity of 210 mAh·g^(-1)at 5 A·g^(-1).After 550 cycles at a current density of 0.5 A·g^(-1),a high reversible capacity of nearly 400 mAh·g^(-1)was ***,in situ X-ray diffraction measurements clearly demonstrate the conversion between Bi and Li_(3)Bi during alloying/dealloying,confirming the good electrochemical reversibility of the materials for Li *** reaction kinetics of Bi_(2)O_(2)CO_(3)@C were further investigated using galvanostatic intermittent titration ***,Bi_2O_(2)-CO_(3)@C exhibited excellent long-term stability,maintaining its high reversible capacity for over 200 cycles at a current density of 0.5 A·g^(-1)in a full cell configuration using Li_(1.20)Mn_(0.54)Ni_(0.13)Co_(0.13)O_(2) as the cathode *** result further underscores its promising potential for lithium-ion *** work may provide inspiration for the design of alloy-type negative electrode materials for high-performance rechargeable batteries.

关键词： Bi_(2)O_(2)CO_(3) Composite materials Anode materials Full batteries

Quantitative evaluation of multi-process collaborative operation in steelmaking–continuous casting sections

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International Journal of Minerals,Metallurgy and Materials 2021年第8期28卷 1353-1366页

作者： Jian-ping Yang Qing Liu Wei-da guo jun-guo Zhang State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China Engineering Research Center of MES Technology for Iron&Steel Production Ministry of EducationBeijing 100083China Laiwu iron and Steel Group Yinshan Section Steel Co. Ltd.Jinan 271104China Hesteel Group Tangsteel Company Tangshan 063000China

The quantitative evaluation of multi-process collaborative operation is of great significance for the improvement of production planning and scheduling in steelmaking–continuous casting sections(SCCSs). However, this evaluation is difficult since it relies on an in-depth understanding of the operating mechanism of SCCSs, and few existing methods can be used to conduct the evaluation, due to the lack of full-scale consideration of the multiple factors related to the production operation. In this study, three quantitative models were developed, and the multiprocess collaborative operation level was evaluated through the laminar-flow operation degree, the process matching degree, and the scheduling strategy availability degree. Based on the evaluation models for the laminar-flow operation and process matching levels, this study investigated the production status of two steelmaking plants, plants A and B, based on actual production data. The average laminar-flow operation(process matching) degrees of SCCSs were obtained as 0.638(0.610) and 1.000(0.759) for plants A and B, respectively, for the period of April to July 2019. Then, a scheduling strategy based on the optimization of the furnace-caster coordinating mode was suggested for plant A. Simulation experiments showed higher availability than the greedy-based and manual strategies. After the proposed scheduling strategy was applied,the average process matching degree of the SCCS of plant A increased by 4.6% for the period of September to November 2019. The multi-process collaborative operation level was improved with fewer adjustments and interruptions in casting.

关键词： steelmaking–continuous casting multi-process collaborative operation quantitative evaluation model laminar-flow operation process matching scheduling strategy