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Formation and ecological response of sand patches in the protection system of Shapotou section of the Baotou-Lanzhou railway,China

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Journal of Arid Land 2024年第2期16卷 298-313页

作者： DUN Yaoquan QU Jianjun KANG Wenyan LI Minlan LIU Bin WANG Tao shao mei Key Laboratory of Desert and Desertification Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China College of Urban and Environmental Sciences Northwest UniversityXi'an 710100China Zhongwei Works Section of China Railway Lanzhou Bureau Group Company Limited Zhongwei 755000China

The development of bare patches typically signifies a process of ecosystem *** the protection system of Shapotou section of the Baotou-Lanzhou railway,the extensive emergence of bare sand patches poses a threat to both stability and ***,there is limited knowledge regarding the morphology,dynamic changes,and ecological responses associated with these sand ***,we analyzed the formation and development process of sand patches within the protection system and its effects on herbaceous vegetation growth and soil nutrients through field observation,survey,and indoor analysis *** results showed that sand patch development can be divided into three stages,i.e.,formation,expansion,and stabilization,which correspond to the initial,actively developing,and semi-fixed sand patches,*** average dimensions of all sand patch erosional areas were found to be 7.72 m in length,3.91 m in width,and 0.32 m in *** actively developing sand patches were the largest,and the initial sand patches were the *** the stage of formation and expansion,the herbaceous community composition changed,and the plant density decreased by more than 50.95%.Moreover,the coverage and height of herbaceous plants decreased in the erosional area and slightly increased in the depositional lobe;and the fine particles and nutrients of soils in the erosional area and depositional lobe showed a decreasing *** the stabilization phases of sand patches,the area from the inlet to the bottom of sand patches becomes initially covered with *** and 0-2 cm surface soil condition improved in the erosional area,but this improvement was not yet evident in the depositional *** such as disturbance,climate change,and surface resistance to erosion exert notable influences on the formation and dynamics of sand *** results can provide evidence for the future treatment of sand patches and the management of the pro

关键词： railway protection system sand patch morphology vegetation characteristic soil property

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Novel flexible broadband microwave absorptive fabrics coated with graphite nanosheets/polyurethane nanocomposites

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Progress in Natural Science:Materials International 2012年第4期22卷 288-294页

作者： Miao-miao Yu shao-hua Chen Zhe Zhou mei-fang Zhu State Key Laboratory for Modification of Chemical Fiber and Polymer Materials College of Materials Science and EngineeringDonghua University

Graphite nanosheets (GNS) were prepared by surfactant assisted ultrasonication from expanded graphite (EG) and followed by coating onto vinylon fabrics with water-borne polyurethane (WPU). The morphology of GNS and GNS/polyurethane (PU) coatings was characterized by field emission scanning electron microscope (FESEM), and the structure of GNS was studied by fourier transform infrared (FTIR) spectroscopy. Electromagnetic (EM) parameters indicated that GNS is a kind of dielectric loss material, in which little magnetic loss is found. Reflection loss (RL) results showed that both GNS content and coated thickness had great influences on the microwave absorption. For the fabric coated with GNS/PU nanocomposites (30/100 by weight, wet thickness of 0.39 mm for dry areal density in 130g/m2 ), RL values exceeding 5dB could be obtained in the frequency range of 10.7-18GHz, while 10dB in 12.7-18GHz, and a minimum value of 28dB at 15.2GHz. These GNS/PU coated fabrics are light and flexible with much thin and low-cost coated layer, and showed great potential in radar camouflaging and electromagnetic interference application.

关键词： Microwave absorption Graphite nanosheets Water-borne polyur-ethane Ultrasonication Coated fabrics

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Extraction and kinetic analysis of Pb and Sr from the leaching residue of zinc oxide ore

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International Journal of Minerals,Metallurgy and Materials 2021年第2期28卷 201-209页

作者： Xiao-yi Shen Yuan-yong Liang Hong-mei shao Yi Sun Yan Liu Yu-chun Zhai Key Laboratory for Ecological Utilization of Multimetallic Mineral of Ministry of Education School of MetallurgyNortheastern UniversityShenyang 110819China School of Environmental and Chemical Engineering Shenyang Ligong UniversityShenyang 110159China

NH4HCO3 conversion followed by HCl leaching was performed and proven to be effective in extracting Pb and Sr from zinc extracted *** mechanism and operating conditions of NH4HCO3 conversion,including molar ratio of NH4HCO3 to zinc extracted residual,NH4HCO3 concentration,conversion temperature,conversion time,and stirring velocity,were discussed,and operating conditions were optimized by the orthogonal *** results indicate that NH4HCO3 conversion at temperatures ranging from 25 to 85°C follows the shrinking unreacted core model and is controlled by inner diffusion through the product *** extraction ratios of Pb and Sr under optimized conditions reached 85.15%and 87.08%,***,the apparent activation energies of Pb and Sr were 13.85 and 13.67 kJ·mol^−1,respectively.

关键词： zinc extraction residual NH4HCO3 conversion HCl leaching Pb Sr reaction mechanism kinetics

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Antagonistic effect of 6-hydroxydopamine (6-OHDA) on generation of immunosuppressive protein of stress in the rat

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Chinese Science Bulletin 1999年第21期44卷 1974-1978页

作者： Juxiang Li Li shao Yifan Li Lin mei shaoguang Fan Department of Physiology Beijing Medical University Beijing China

Neonatal rats were injected with 6-hydroxydopamine (6-OHDA) for chemical sympa-thectomy. The rats were treated with restraint stress when they grew up to 56 d. It has been found that the generation of immunosuppressive protein of stress (ISPS) is significantly reduced, suggesting that peripheral sympathetic nerve plays an important role in mediating the generation of ISPS.

关键词： stress-induced immunosuppressive protein restraint stress 6-hydroxydopamine lymphocyte proliferation HPLC-ED.

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UV-Vis and Surface Photovoltage Spectra of Fe_2O_3/Polystyrene Composite Microspheres

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Chemical Research in Chinese Universities 2002年第1期18卷 75-78页

作者： QIAN Xin-ming ZHANG Xin-tong shao Hui-bo BAI Yu-bai LI tie-jin TANG Xin-yi DONG shao-jun Laboratory of Electroanalytical Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022P.R.China Department of Chemistry Jilin UniversityChangchun 130023P.R.China Department of Chemistry Capital Normal UniversityBeijing 100037P.R.China

Fe_2O_3 sol with the particle diameter of 3-5 nm was flocculated by the addition of SDS, and the flocculate formed was redispersed by the further addition of that surfactant. Thus the surfactant bilayer was formed on the surface of Fe_2O_3. The emulsion polymerization of styrene(St) adsolubilized on the surfactant adsorbed bilayer was carried out by initiator potassium persulfate(KPS). The UV-Vis and surface photovoltage spectra(SPS) indicate that the Fe_2O_3 particles were encapsulated in polystyrene(PSt) successfully.

关键词： Fe2O3 nanoparticles Encapsulation Composite microspheres

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Atomistic study on tensile fracture of densified silica glass and its dependence on strain rate

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Chinese Physics B 2020年第12期29卷 498-505页

作者： Zhi-Qiang Hu Jian-Li shao Yi-Fan Xie Yong mei State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China School of Science China University of Mining and TechnologyBeijing 100083China Institute of Defense Engineering AMSPLABeijing 100036China

Densification is a major feature of silica glass that has received widespread *** work investigates the fracture behavior of densified silica glass upon uniaxial tension based on atomistic *** is shown that the tensile strength of the silica glass approximately experiences a parabolic reduction with the initial density,while the densified samples show a faster power growth with the increase of strain ***,the fracture strain and strain energy increase significantly when the densification exceeds a certain threshold,but fracture strain tends to the same value and strain energy becomes closer for different densified samples at extreme high strain *** views indicate that all the cracks are formed by the aggregation of nanoscale *** transition from brittleness fracture to ductility fracture can be found with the increase of strain rate,as a few fracture cracks change into a network distribution of many small ***,for the high densified sample,there appears an evident plastic flow before fracture,which leads to the crack number less than the normal silica glass at the high strain ***,the coordinated silicon analysis suggests that high strain rate tension will especially lead to the transition from 4-to 3-fold Si when the high densified sample is in plastic flow.

关键词： silica glass densification fracture strain rate atomistic simulation

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Breast and dorsal spine relapse of granulocytic sarcoma after allogeneic stem cell transplantation for acute myelomonocytic leukemia:A case report

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World Journal of Clinical Cases 2022年第7期10卷 2315-2321页

作者： Yuan Li Yu-De Xie shao-Jie He Jia-mei Hu Zhi-Sheng Li shao-Hua Qu Department of Breast Surgery The First Affiliated Hospital of Jinan UniversityGuangzhou 510630Guangdong ProvinceChina Department of Orthopaedics The First Affiliated Hospital of Jinan UniversityGuangzhou 510630Guangdong ProvinceChina

BACKGROUND Granulocytic sarcoma(GS)is a rare malignant tumor,and relapse is even rarer in the breast and dorsal spine following allogeneic hematopoietic stem cell ***,a standard treatment regimen is not *** SUMMARY A rare case of GS of the right breast and dorsal spine after complete remission of acute myelogenous leukemia is reported here.A 55-year-old female patient presented with a palpable,growing,painless lump as well as worsening dorsal compressive *** had a history of acute myelomonocytic leukemia(AML M4)and achieved complete remission after chemotherapy following allogeneic hematopoietic stem cell *** examinations showed the breast lump and C7-T1 epidural masses suspected of *** results were compatible with GS in both the right breast and dorsal spine,which were considered extramedullary relapse of the AML treated 4 years *** A rare case of GS relapse following allogeneic hematopoietic stem cell transplantation and guidelines for treatment are discussed.

关键词： Granulocytic sarcoma Breast Dorsal spine Acute myeloid leukemia Allogeneic hematopoietic stem cell transplantation Case report

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双针-板结构脉冲气泡放电等离子体固氮研究

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原子与分子物理学报 2025年第6期42卷 122-128页

作者：赵少伟张丽方志南京工业大学电气工程与控制科学学院南京211816

大气压低温等离子体可以利用空气直接进行氧化固氮,具有反应条件温和、参数灵活可控、避免温室气体排放等优点.本文利用双针-板电极在水中形成气泡放电等离子体,以空气为放电气体进行了固氮研究,分析了产物浓度和固氮能耗的影响因素.研... 详细信息

大气压低温等离子体可以利用空气直接进行氧化固氮,具有反应条件温和、参数灵活可控、避免温室气体排放等优点.本文利用双针-板电极在水中形成气泡放电等离子体,以空气为放电气体进行了固氮研究,分析了产物浓度和固氮能耗的影响因素.研究结果表明,等离子体中含有丰富的氮原子、氧原子、氢原子、激发态氮分子等活性物种,可高效合成硝态含氮产物.研究发现,脉冲参数、电极间隙、工作气体组分对气泡放电等离子体的固氮性能有重要影响.装置最高NO~-_x合成速率为19.2μmol/min,最小能耗约为11 MJ/mol.此外还发现,电极间隙为6 mm时,固氮性能最优;空气中增加适量氧气(氧气/氮气比例为0.4)可以增强产物合成,降低能耗.

关键词：低温等离子体纳秒脉冲放电气液放电固氮

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Zinc extraction from zinc oxidized ore using(NH4)2SO4 roasting−leaching process

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International Journal of Minerals,Metallurgy and Materials 2020年第11期27卷 1471-1481页

作者： Xiao-yi Shen Hong-mei shao Ji-wen Ding Yan Liu Hui-min Gu Yu-chun Zhai Key Laboratory for Ecological Utilization of Multimetallic Mineral of Ministry of Education School of MetallurgyNortheastern UniversityShenyang 110819China School of Environmental and Chemical Engineering Shenyang Ligong UniversityShenyang 110159China School of Computer Science and Engineering Northeastern UniversityShenyang 110819China

An improved method of(NH4)2SO4 roasting followed by water leaching to utilize zinc oxidized ores was *** operating parameters were obtained by investigating the effects of the molar ratio of(NH4)2SO4 to zinc,roasting temperature,and holding time on zinc *** roasting process followed the chemical reaction control mechanism with the apparent activation energy value of 41.74 kJ·mol^−*** transformation of mineral phases in roasting was identified by X-ray diffraction analysis combined with thermogravimetry–differential thermal analysis *** water leaching conditions,including the leaching temperature,leaching time,stirring velocity,and liquid-to-solid ratio,were discussed,and the leaching kinetics was *** reaction rate was obtained under outer diffusion without product layer control;the values of the apparent activation energy for two stages were 4.12 and 8.19 kJ·mol^−*** maximum zinc extraction ratio reached 96%while the efficiency of iron extraction was approximately 32%under appropriate *** work offers an effective method for the comprehensive use of zinc oxidized ores.

关键词： zinc oxidized ore ammonium sulfate roasting,water leaching kinetics mechanism extraction ratio

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A chitosan-mediated inhalable nanovaccine against SARS-CoV-2

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Nano Research 2022年第5期15卷 4191-4200页

作者： shao-Hua Zhuo Jun-Jun Wu Lang Zhao Wen-Hao Li Yu-Fen Zhao Yan-mei Li Key Lab of Bioorganic Phosphorus Chemistry&Chemical Biology Department of ChemistryTsinghua UniversityBeijing 100084China Beijing Institute for Brain Disorders Beijing 100069China Center for Synthetic and Systems Biology Tsinghua UniversityBeijing 100084China Institute of Drug Discovery Technology Ningbo UniversityNingbo 315221China

Severe acute respiratory syndrome coronavirus 2(SARS-CoV-2),with several antigenic variants,has grown into a global challenge,and the rapid establishment of an immune barrier is crucial to achieving long-term control of the *** has led to a great demand for easy preparation and scalable vaccines,especially in low-income ***,we present an inhalable nanovaccine comprising chitosan and SARS-CoV-2 spike *** chitosan-mediated nanovaccine enabled a strong spike-specific antibody immune response and augmented local mucosal immunity in bronchoalveolar lavage and lungs,which might be capable of protecting the host from infection without systemic *** addition,the enhanced adaptive immunity stimulated by chitosan showed potential protection against ***,inhalation of the nanovaccine induced a comparable antibody response compared to intramuscular *** inhalable nanovaccine against SARS-CoV-2 offers a convenient and compliant strategy to reduce the use of needles and the need for medical staff.

关键词： severe acute respiratory syndrome coronavirus 2(SASR-CoV-2) inhalation nanovaccine chitosan

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