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Shear strength features of soils developed from purple clay rock and containing less than two-millimeter rock fragments

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Journal of Mountain Science 2016年第8期13卷 1464-1480页

作者： ZHONG Shou-qin ZHONG Mang wei Chao-fu zhang wei-hua HU Fei-nan College of Resources and Environment Southwest University Chongqing 400715 China Key Laboratory of Arable Land Conservation (Southwest China) Ministry of Agriculture Chongqing 400715 China

Soil shear strength is an important indicator of engineering design and an essential parameter of soil precision tillage and agricultural machinery and equipment design. Although numerous studies have investigated the characteristics of different soil shear strengths, only a few of these works have paid attention to soils containing considerable quantities of rock fragments. To date, most studies on the effects of rock fragments on the shear strength have paid attention to the role of rock fragments with sizes 〉2 mm. The effects of rock fragments 〈2 mm in soil are generally ignored. Similar to rock fragments 〉2 ram, the presence of rock fragments 〈2 mm could also change the mechanical properties of soils. Thus, in the present study we evaluated the potential influence of 〈2 mm rock fragments on soil shear strength via an unconsolidated undrained （UU） triaxial compression test. Our results were as follows：（1） A certain quantity of 〈2 mm rock fragments presented in purple soils developed from clay rocks; and an appropriate quantity of 〈2 mm rock fragments could improve the shear strength of soils. （2） The different PSDs of soils containin 〈2 mm rock fragment mainly caused variations in the internal friction angle of soils. （3） The shear strengths of the two mudstone-developed red-brown and gray-brown purple soils was more sensitive to water than that of the shale-developed coarse-dark purple soil. As the soil water content increased from 9% to 23%, the changes in the cohesion, internal friction angle, shear strength, and the maximum principal stress difference were smaller in the coarse dark purple soil than in the two other soils. We therefore concluded that 〈2 mm rock fragments in purple soils exerted important effects on soil shear strength. A better understanding of the differences among the shear strength features of purple soils could help improve the design of agricultural machinery and equipment.

关键词： Shear strength Purple soils Rockfragments Particle size distribution (PSD) Soil watercontent Triaxial test

Soil Contamination due to Activities： A Review with E-Waste Disposal and Recycling Special Focus on China

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Pedosphere 2012年第4期22卷 434-455页

作者： zhang wei-hua WU Ying-Xini M. O. SIMONNOT School of Environmental Science and Engineering Sun Yat-sen University Guangzhou 510275 (China) Environmental Science Division Oak Ridge National Laboratory Oak Ridge TN 37831 (USA) Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology Guangzhou 510275 (China) Laboratoire Rdactions et Gdnie des Procgdds (LRGP) Universitd de Lorraine-CNRS (UPR 3349) 1 Rue Grandville BP20451 54001 Nancy Cedex (France)

This paper presents a review of soil contamination resulting from e-waste recycling activities, with a special focus on China, where many data have been collected for a decade. Soils in the e-waste areas are often contaminated by heavy metals and organic compounds, mainly polycyclic aromatic hydrocarbons （PAHs）, polybrominated diphenyl ethers （PBDEs）, polychlorinated and polybrominated biphenyls （PCBs and PBBs）, dechlorane plus （DP）, hexabromocyclododecanes （HBCDs）, polychlorinated and polybrominated dibenzo- p-dioxins （PCDDs and PBDDs）, and polychlorinated and polybrominated dibenzofurans （PCDFs and PBDFs）, while other compounds, not systematically monitored, can be found as well. Pollutants are generally present in mixtures, so pollution situations are complex and diversified with a gradient of contamination from agricultural soils to hot spots at e-waste sites and mainly in open burning areas. It has been proved that pollutants were transferred to the food chain via rice in China, and that the population was threatened since high levels of various pollutants were detected in blood, placentas, hair, etc., of residents of e-waste sites. Eventually, soil remediation techniques are reviewed. Although there are many available techniques devoted to heavy metals and persistent organic pollutants, the current techniques for the e-waste sites, where these contaminants coexist, are very sparse. Phytoremediation has been investigated and co-cropping appears as a promising approach for the slightly contaminated agricultural soils. In some cases, different remediation techniques should be combined or trained, while the influence of coexisting contaminants and the removal sequence of contaminants should be considered. In hot spots, physical and chemical techniques should be used to reduce high pollution levels to prevent further pollutant dissemination. This review highlights the urgent needs for 1） characterization of pollution status in all the countries where e-wastes are r

关键词： co-cropping heavy metals organic compounds pollution remediation

Photosensitivity and a precise combination of size-dependent lambda-cyhalothrin microcapsules synergistically generate better insecticidal efficacy

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Journal of Integrative Agriculture 2023年第5期22卷 1477-1488页

作者： GAO Yue LUO Jian SUN Yue zhang hua-wei zhang Da-xia LIU Feng MU wei LI Bei-xing Key Laboratory of Pesticide Toxicology&Application Techniques Shandong Agricultural UniversityTai’an 271018P.R.China College of Plant Protection Shandong Agricultural UniversityTai’an 271018P.R.China Heilongjiang Forest Industry Agrochemical Co. Ltd.Harbin 150324P.R.China

In this study, lambda-cyhalothrin(LC) loaded polyurea microcapsules(MCs) with different particle sizes were *** of the MCs showed varying degrees of physical collapse, which was more obvious among those with smaller particle sizes. MCs with particle sizes of 1.38 μm(MC-S), 5.13 μm(MC-M) and 10.05 μm(MC-L) had shell thicknesses of 39.6,50.3 and 150.1 nm, respectively. MCs with smaller particles tended to have significantly faster release profiles, and the MC-S group had much higher bioactivity against Agrotis ipsilon and better foliar affinity on the peanut leaves(indicated by rainfastness) than MC-M and MC-L. All of the MCs exhibited light-enhanced release profiles and had much slower degradation compared with the emulsifiable concentrate(EC) group, among which MC-L had the slowest *** generate MCs with both favorable quick efficacy and long-lasting efficacy, binary mixtures of MC-S, MC-M and MC-L were produced by mixing them in pairs at ratios of 2:1, 1:1 and 1:2. The mixture of MC-S:MC-L at 1:2 showed the best comprehensive efficacy in the peanut foliar spray scenario among the nine tested combinations, and its effective duration was three times longer than that of EC. Overall, the precise combination of MCs with different particle sizes can regulate the efficacy of pesticide control and serve as a strategy for the better utilization of pesticides.

关键词： polyurea microcapsules size control combination strategy pest control initial and long-term efficacy

Erosion-corrosion investigation of high chromium cast irons using newly designed jet type tester

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中国有色金属学会会刊：英文版 2004年第z1期14卷 405-412页

作者： TU Xiao-hui LIU Jun-quan LI wei zhang Feng-hua SU Jun-yi School of Materials Science and Engineering Xi''an Jiaotong University Xi''an 710049 China Wear Materials Research Center Guangzhou Research Institute of Nonferrous Metals Guangzhou 510651 China College of Industrial Equipment and Control Engineering South China University of Technology Guangzhou 510640 China Department of Chemistry Ji''nan University Guangzhou 510632 China Wear Materials Research Center Guangzhou Research Institute of Nonferrous Metals Guangzhou 510651 China School of Materials Science and Engineering Xi''an Jiaotong University Xi''an 710049 China

A jet type erosion-corrosion tester was developed for the erosion-corrosion investigation of high-chromium cast irons. During tests the size and the shape of particles in the slurry can be maintained stable. The jet velocity and attack angle can be accurately controlled. The repeatability and ranking consistency of the test results are satisfactory. The test parameters can be adjusted in a wide range, so that the tester can simulate various practical working conditions. Electrochemical test data can be automatically collected and processed. Dynamic polarization curves can be obtained during erosion-corrosion test, which can be used to study the dynamic corrosion *** high chromium cast irons were studied in hot concentrated alkaline slurry. The results show that the erosioncorrosion mass loss rate and dynamic corrosion rate of 295Cr26 iron is lower than that of 185Cr13 under the conditions similar to alumyte processing. The mechanism of erosion-corrosion of 295Cr26 and 185Cr13 was studied by using the tester. The interaction between erosion and corrosion was also quantitatively evaluated.

关键词： erosion-corrosion tester repeatability chromium cast iron hot concentrated alkali

Differential geometric guidance command with finite time convergence using extended state observer

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Journal of Central South University 2016年第4期23卷 859-868页

作者：麻毅威张为华 College of Aerospace Science and Engineering National University of Defense TechnologyChangsha 410073China Unit 61541 of PLA Beijing 100094China

For improving the performance of differential geometric guidance command(DGGC), a new formation of this guidance law is proposed, which can guarantee the finite time convergence(FTC) of the line of sight(LOS) rate to zero or its neighborhood against maneuvering targets in three-dimensional(3D) space. The extended state observer(ESO) is employed to estimate the target acceleration, which makes the new DGGC more applicable to practical interception scenarios. Finally, the effectiveness of this newly proposed guidance command is demonstrated by the numerical simulation results.

关键词： missile guidance differential geometric guidance command (DGGC) finite time convergence (FTC) extended state observer (ESO) maneuvering targets

张卫华应用“点区带结合法”治疗躯体痛临床经验

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中国针灸 2022年第3期42卷 311-313页

作者：张晓彤赵颖倩张卫华(指导) 陕西中医药大学针灸推拿学院咸阳712046 陕西中医药大学第二附属医院名医馆咸阳712000

总结张卫华教授应用“点区带结合法”治疗躯体痛的临床经验。张教授融经络皮部、标本、“以痛为腧”及局部整体全息论等为一体,对疼痛区域直径小于3 cm的采用点治法(皮下针法);疼痛区域直径大于3 cm的采用区治法(围刺针法);带治法(尺胫... 详细信息

总结张卫华教授应用“点区带结合法”治疗躯体痛的临床经验。张教授融经络皮部、标本、“以痛为腧”及局部整体全息论等为一体,对疼痛区域直径小于3 cm的采用点治法(皮下针法);疼痛区域直径大于3 cm的采用区治法(围刺针法);带治法(尺胫针法)适用于各种急、慢性躯体痛。3种针法临床可单用,也可合用。

关键词：躯体痛皮下针法围刺针法尺胫针法名医经验张卫华

Modification of Sugar Chains in Glycoalkaloids and Variation of Anticancer Activity

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Chemical Research in Chinese Universities 2007年第3期23卷 303-309页

作者： LI Sheng-yu HE Da-jun zhang Xu NI wei-hua ZHOU Yi-fa zhang Li-ping School of Life Sciences Northeast Normal University Changchun 130024 P. R. China

To study the effect of the sugar chains in glycoalkaloids against cancer cells, 6-0-sulfated solamargine and acidcatalyzed hydrolytic products of α-solamargine and α-solasonine were prepared. The sulfation at 0-6 of solamargine was proceeded in five steps. The 6-OH group was first selectively protected with DMT-Cl, and then the secondary hydroxyl groups on the sugar ring were acetylated. After the protective group DMTr was removed, the free 6-OH group was sulfated. Finally, the acetyl groups were removed to give 6-0-sulfated solamargine in a good yield. The hydrolyses of solamargine and solasonine were performed in diluted hydrogen chlorede. Three and two hydrolyzed products were obtained from solamargine and solasonine, respectively. The antiproliferative activities against HCT-8 tumor cells of two glycoalkaloids and their derivaties were examined via a MTT assay. The results show that α-solamargine and α-solasonine exhibit strong cytotoxic activities with an IC50 of 10. 63 and 11.97 μmol/L, respectively, wheras their derivaties seem to be less activities.

关键词： Solamargine Solasonine Anticancer Sulfation Acidic hydrolysis

Microneedle patch loaded with ferritin-nanocaged doxorubicin for locally targeted drug delivery and efficient skin cancer treatment

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Particuology 2024年第5期88卷 282-289页

作者： Feng Li Yuan Yang hua Yue Shuang Wang Xiao zhang wei wei State Key Laboratory of Biochemical Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing100190China Key Laboratory of Biopharmaceutical Preparation and Delivery Chinese Academy of SciencesBeijing100190China School of Chemical Engineering University of Chinese Academy of SciencesBeijing100049China

Ferritin has emerged as a promising nanocarrier for delivering therapeutic agents to ***,the limited drug loading and the off-target impacts after systemic administration remain challenges for cancer treatment with ferritin-based ***,we develop a microneedle patch loaded with ferritin-nanocaged doxorubicin(DoxFe@Fn/MN)for skin cancer ***,doxorubicin(Dox)is encapsulated in ferritin(Fn)using an iron core-assisted strategy,which results in a 3.4-fold increase in Dox loading compared to the direct loading ***,a polyvinyl alcohol-based microneedle(MN)patch is used for the transdermal delivery of DoxFe@Fn,enabling targeted tumour accumulation of DoxFe@Fn and preventing off-target *** released DoxFe@Fn can bind to CD71 highly expressed on skin cancer cells,facilitating its *** a result,the DoxFe@Fn/MN therapy presents a robust antitumour effect in a melanoma tumour model,showing its potential as a promising therapeutic modality for skin cancer treatment.

关键词： Ferritin Microneedle Skin cancer Drug delivery

胡晓灵主任医师治疗新冠后遗症中医临床经验案例

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新疆中医药 2024年第4期42卷 56-59页

作者：张卫华姚雪伊小鹤胡晓灵新疆维吾尔自治区中医医院开发区分院新疆乌鲁木齐830026 乌鲁木齐市中医医院新疆乌鲁木齐830000 新疆农业科学院社区服务站新疆乌鲁木齐830000 新疆维吾尔自治区中医医院新疆乌鲁木齐830000

新冠疫情肆虐三年余,给全球各国人民带来后遗症的困扰不少,对个人和社会产生重大影响。据报道,目前已经发现超过200种可以影响日常生活功能和活动的长新冠症状,包括身体、心理和认知功能等。胡晓灵主任医师根据新冠后遗症的特点认为:新... 详细信息

新冠疫情肆虐三年余,给全球各国人民带来后遗症的困扰不少,对个人和社会产生重大影响。据报道,目前已经发现超过200种可以影响日常生活功能和活动的长新冠症状,包括身体、心理和认知功能等。胡晓灵主任医师根据新冠后遗症的特点认为:新冠病毒感染属中医“疫”病范畴,可致机体气血虚弱,久病损伤肺、心、脾、肾等脏腑广泛损伤,不独局限于肺脏,使机体阴阳失衡,脏腑气衰,功能失调,从而临床表现各异。针对于具体病症如新冠感染后虚弱证、新冠重症后低热、新冠后腔隙性脑梗塞、新冠后汗证,胡师辨证论治,采取不同的中医治疗方法,在临床中取得了很好的临床疗效。

关键词：新冠后遗症疫病中医临床案例