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Microstructure Characterization of Bubbles in Gassy Soil Based on the Fractal Theory

Journal of Ocean university of china 2024年第1期23卷 129-137页

作者： WU Chen LIN Guoqing LIU Lele LIU tao LI Chengfeng GUO Zhenqi Shandong Provincial Key Laboratory of marine Environment and Geological Engineering Ocean University of ChinaQingdao 266100China Key Laboratory of Gas Hydrate Ministry of Natural ResourcesQingdao Institute of Marine GeologyQingdao 266237China College of environmental Science and Engineering Ocean University of ChinaQingdao 266100China Key Laboratory of marine Environment and Ecology Ministry of EducationOcean University of ChinaQingdao 266100China Qingdao National Laboratory for marine Science and Technology Qingdao 266237China

The microscopic characterization of isolated bubbles in gassy soil plays an important role in the macroscopic physical properties of sediments and is a key factor in the study of geological hazards in gas-bearing *** on the box-counting method and the pore fractal features in porous media,a fractal model of bubble microstructure parameters in gassy soil under different gas con-tents and vertical load conditions is established by using an industrial X-ray CT scanning *** results show that the fractal di-mension of bubbles in the sample is correlated with the volume fraction of bubbles,and it is also restricted by the vertical *** three-dimensional fractal dimension of the sample is about 1 larger than the average two-dimensional fractal dimension of all the slices from the same *** uniform porous media fractal model is used to test the equivalent diameter,and the results show that the variation of the measured pore diameter ratio is jointly restricted by the volume fraction and the vertical *** addition,the measured self-similarity interval of the bubble area distribution is tested by the porous media fractal capillary bundle model,and the fitting curve of measured pore area ratio in a small loading range is obtained in this paper.

关键词： gassy soil bubble microstructure parameters fractal dimension vertical load

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Response of Stream Pollution Characteristics to Catchment Land Cover in Cao-E River Basin, china

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Pedosphere 2011年第1期21卷 115-123页

作者： SHEN ye-Na LUE Jun CHEN Ding-Jiang SHI Yi-Ming Department of Natural resources College of Environmental Science and Natural Resources Zhejiang University Hangzhou 310029 (China) china Ministry of Education Key Lab of environmental Remediation and Ecological Health Zhejiang University Hangzhou 310029 (China) Zhejiang Provincial Key Laboratory of Subtropical Soil and Plant Nutrition Zhejiang University Hangzhou 310029 (China)

This study addressed the relationship of river water pollution characteristics to land covers and human activities in the catchments in a complete river system named Cao-E River in eastern *** on the hydrogeochemical data collected monthly over a period of 3 years,cluster analysis(CA) and principal component analysis(PCA) were adopted to categorize the river reaches and reveal their pollution *** to the differences of water quality in the river reaches and land use patterns and average population densities in their catchments,the whole river system could be categorized into three groups of river reaches,i.e.,non-point sources pollution reaches(NPSPR),urban reaches(UR) and mixed sources pollution reaches(MSPR).In UR and MSPR,the water quality was mainly impacted by nutrient and organic pollution,while in NPSPR nutrient pollution was the main *** nitrate was the main nitrogen form in NPSPR and particulate phosphorus was the main phosphorus form in *** were no apparent trends for the variations of pollutant concentrations with increasing river flows in NPSPR and MSPR,while in UR the pollutant concentrations decreased with increasing river *** dry season was the critical period for water pollution control in ***,catchment land covers and human activities had significant impact on river reach water pollution type,nutrient forms and water quality responses to hydrological conditions,which might be crucial for developing strategies to combat water pollution in watershed scale.

关键词： cluster analysis hydrological conditions pollution factors principle component analysis water quality

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Failure mechanisms and destruction characteristics of cemented coal gangue backfill under compression effect of non-uniform load

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Journal of Central South university 2024年第8期31卷 2676-2693页

作者： FENG Guo-rui GUO Wei QI Ting-ye LI Zhu CUI Jia-qing WANG Hao-chen CUI ye-kai ma Jing-kai College of Mining Engineering Taiyuan University of TechnologyTaiyuan 030024China Shanxi Province Research Center of Green Mining Engineering Technology Taiyuan 030024China Shanxi Province Coal-based resources Green and High-efficiency Development Engineering Center Taiyuan 030024China Shanxi Key Laboratory of Mine Rock Strata Control and Disaster Prevention Taiyuan 030024China Shanxi-Zheda Institute of Advanced materials and Chemical Engineering Taiyuan 030024China

Backfill mining is one of the most important technical means for controlling strata movement and reducing surface subsidence and environmental damage during exploitation of underground coal {2.. Ensuring the stability of the backfill bodies is the primary prerequisite for maintaining the safety of the backfilling working face, and the loading characteristics of backfill are closely related to the deformation and subsidence of the roof. Elastic thin plate model was used to explore the non-uniform subsidence law of the roof, and then the non-uniform distribution characteristics of backfill bodies’ load were revealed. Through a self-developed non-uniform loading device combined with acoustic emission (AE) and digital image correlation (DIC) monitoring technology, the synergistic dynamic evolution law of the bearing capacity, apparent crack, and internal fracture of cemented coal gangue backfills (CCGBs) under loads with different degrees of non-uniformity was deeply explored. The results showed that: 1) The uniaxial compressive strength (UCS) of CCGB increased and then decreased with an increase in the degree of non-uniformity of load (DNL). About 40% of DNL was the inflection point of DNL-UCS curve and when DNL exceeded 40%, the strength decreased in a cliff-like manner;2. A positive correlation was observed between the AE ringing count and UCS during the loading process of the specimen, which was manifested by a higher AE ringing count of the high-strength specimen. 3) Shear cracks gradually increased and failure mode of specimens gradually changed from “X” type dominated by tension cracks to inverted “Y” type dominated by shear cracks with an increase in DNL, and the crack opening displacement at the peak stress decreased and then increased. The crack opening displacement at 40% of the DNL was the smallest. This was consistent with the judgment of crack size based on the AE b-value, i. e., it showed the typical characteristics of “small b-value-large crack and

关键词： cemented coal gangue backfill non-uniform load degree of non-uniformity of load failure mode crack opening displacement

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金霉素和土霉素对生物除磷中微生物EPS的影响

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光谱学与光谱分析 2024年第4期44卷 1191-1200页

作者：陶传奇张华黄健奚姗姗何春华罗涛王金花张佳妹马牧野安徽建筑大学环境与能源工程学院安徽合肥230601 环境污染控制与废弃物资源化利用安徽省重点实验室安徽合肥230601 安徽省生态文明研究院安徽合肥230601

金霉素和土霉素在城市污水处理厂中检出率较高,通常以混合物的形式存在于污水中。微生物胞外聚合物(EPS)作为保护层抵御外界有害物质的侵害,在微生物生命活动中发挥着重要作用。目前,关于金霉素和土霉素对生物除磷中微生物EPS的影响较... 详细信息

金霉素和土霉素在城市污水处理厂中检出率较高,通常以混合物的形式存在于污水中。微生物胞外聚合物(EPS)作为保护层抵御外界有害物质的侵害,在微生物生命活动中发挥着重要作用。目前,关于金霉素和土霉素对生物除磷中微生物EPS的影响较少。为探究金霉素和土霉素对生物除磷中微生物EPS的影响,采用直接均分射线法设计3种不同浓度配比(L1、L2.L3)混合物,研究了不同浓度金霉素、土霉素单独作用及其混合物对EPS中蛋白质和多糖的影响。采用三维荧光光谱(3D-EEM)和傅里叶变换红外光谱(FTIR)分析金霉素和土霉素对EPS组分及结构的影响。结果表明:随着浓度增加和反应时间的延长,生物除磷系统性能逐渐恶化,微生物EPS中蛋白质和多糖含量均呈现先上升后下降的趋势,且蛋白质含量均高于多糖。3D-EEM分析表明,随金霉素、土霉素及其混合物浓度增加,EPS中类蛋白质物质荧光强度均先增强后减弱,浓度较高时产生了类腐殖酸物质和类富里酸物质。金霉素与土霉素之间存在拮抗作用,使得混合物荧光物质的荧光强度均弱于单独作用,只有配比L3中未出现类腐殖酸物质和类富里酸物质。FTIR分析表明,金霉素、土霉素及其混合物对EPS中1653 cm^(-1)酰胺Ⅰ谱带的C O伸缩振动、1403 cm^(-1)酰胺Ⅱ谱带的C O对称拉伸、12.6 cm^(-1)的P O伸缩振动、1100 cm^(-1)的糖类C—OH伸缩振动均产生影响。金霉素与土霉素存在拮抗作用引起各官能团存在差异性,1004 cm^(-1)的P—OH伸缩振动只存在于土霉素、配比L2.配比L3;900 cm^(-1)的P—O伸缩振动只存在于金霉素、土霉素、配比L2.配比L3;770 cm^(-1)的氨基酸COO变角振动只有金霉素中不存在。该研究将为科学评估金霉素和土霉素及其混合污染物对生物除磷中微生物EPS影响机制提供理论依据。

关键词：金霉素土霉素胞外聚合物生物除磷

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Fine particle trace elements at a mountain site in southern china:Source identification,transport,and health risks

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Journal of environmental Sciences 2024年第7期141卷 166-181页

作者： Jiaoping Xing Runping Ding Feifeng Chen Linyu Peng Wenhua Wang Xiaoyan Song Qing ye Yuanqiu Liu Key Laboratory of State Forestry and Grassland Administration on Forest Ecosystem Protection and Restoration of Poyang Lake Watershed School of ForestryJiangxi Agricultural UniversityNanchang 330045China school of resources and {2.terials Northeastern University at QinhuangdaoQinhuangdao 066004China College of Geosciences and Engineering North China University of Water Resources&Electric PowerZhengzhou 450046China

Trace elements in atmospheric particulate matter play a significant role in air quality,human health,and biogeochemical *** this study,the trace elements(Ca,Al,K,Fe,Na,Mg,Zn,Pb,Mn,Ti,Cu,Cr,Sr,Ni)in PM2.5samples collected at the summit of *** were analyzed to quantify their abundance,source,transport,and health *** the whole sampling period,the major trace elements was Ca,Al,and *** the trace metals with the lowest concentrations were Sr,Ni,Rb,and *** trace elements were influenced by air mass transport routes,exhibiting an increasing trend of crustal elements in the northwesterly airmass and anthropogenic elements(Zn,Mn,Cu,and Ni)in the easterly air *** dust,coal+biomass burning,vehicle emission,urban nitrate-rich+urban waste incineration emissions,and soil dust+industry emissions were common sources of PM2.5on *** air mass transport routes had various source contribution *** results indicate that trace elements at *** are influenced by regional anthropogenic emissions and monsoon-dominated trace element *** total resulting cancer risk value that these elements posed were below the acceptable risk value of 1×10^(-6),while the non-carcinogenic risk value(1.72.was higher than the safety level,suggesting that non-carcinogenic effects due to these trace elements inhalation were likely to *** emission and coal+biomass burning were the common dominant sources of non-cancer risks posed by trace elements at ***.

关键词： Trace elements Risk assessment Cluster analysis Source apportionment

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基于Pasternak海床模型的椭圆余弦波浪荷载作用下埋置管线动力响应解析解

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工程力学 2024年第1期41卷 76-89页

作者：张治国叶铜张成平 PAN Yu-tao 沈安鑫吴钟腾上海理工大学环境与建筑学院上海200093 自然资源部丘陵山地地质灾害防治重点实验室福建省地质灾害重点实验室福州350002 国家海洋局北海预报中心山东省海洋生态环境与防灾减灾重点实验室青岛266061 北京交通大学城市地下工程教育部重点实验室北京100044 Department of Civil and environmental Engineering National University of SingaporeSingapore 119077

通过两阶段分析方法,针对椭圆余弦波作用下埋置管线的动力响应进行了探究。基于椭圆余弦波理论,采用Biot固结方程推导了非线性波浪作用下浅水区埋置管线所受的周期波浪压力;将管线考虑为动力Pasternak海床模型上的Euler-Bernoulli梁,将... 详细信息

通过两阶段分析方法,针对椭圆余弦波作用下埋置管线的动力响应进行了探究。基于椭圆余弦波理论,采用Biot固结方程推导了非线性波浪作用下浅水区埋置管线所受的周期波浪压力;将管线考虑为动力Pasternak海床模型上的Euler-Bernoulli梁,将波浪动荷载施加到管线上获得无限长管线的动力响应偏微分控制方程;利用Fourier变换和Laplace变换并借助卷积定理得到管线挠度、速度、加速度、转角、弯矩和剪力的动力响应解。通过与三维有限元数值算例及既有试验结果对比验证了解析解的正确性与适用性。对椭圆余弦波作用下埋置管线的动力响应特性进行了敏感参数分析,结果表明:波浪高度H显著影响了波面形状与海床内波浪力大小,不同浪高下管线转角、弯矩和剪力的变化更明显,而挠度、速度和加速度响应敏感性则较低。

关键词：非线性波浪埋置管线渗流力管土作用动力Pasternak海床模型

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Blocking the PD-1 signal transduction by occupying the phosphorylated ITSM recognition site of SHP-2

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Science china Life Sciences 2024年

作者： Wenjie Li Wenyi Mei Hewei Jiang Jie Wang Xiaoli Li Lina Quan Yanyan Diao Yanni ma Sisi Fan Zhuwei Xie Mengdie Gong Huan Zhu Dewen Bi Feng Zhang Lei ma Jian Zhang Yufeng Gao Aris Paschalidis Honghuang Lin Fangfang Liu Kangdong Liu Mingliang ye Zhenjiang Zhao Yajun Duan Zhuo Chen Yufang Xu Weilie Xiao Shengce {2. Lili Zhu Honglin Li Innovation Center for AI and Drug Discovery East China Normal University Shanghai Key Laboratory of New Drug Design School of PharmacyEast China University of Science&Technology Shanghai Center for Systems Biomedicine Key Laboratory of Systems Biomedicine (Ministry of Education)Shanghai Jiao Tong University Lingang Laboratory Key Laboratory of Medicinal Chemistry for Natural Resource Ministry of EducationYunnan Characteristic Plant Extraction LaboratoryYunnan Provincial Center for Research&Development of Natural ProductsState Key Laboratory for Conservation and Utilization of Bio-Resources in YunnanSchool of Pharmacy and School of Chemical Science and TechnologyYunnan University CAS Key Laboratory of Separation Sciences for Analytical Chemistry National Chromatographic R&A CenterDalian Institute of Chemical PhysicsChinese Academy of Sciences Department of Cardiology The First Affiliated Hospital of USTCDivision of Life Sciences and MedicineUniversity of Science and Technology of China Department of Infectious Diseases The First Affiliated Hospital of Anhui Medical University Department of Medicine University of Massachusetts Chan Medical School Department of Pathophysiology School of Basic Medical SciencesAcademy of Medical ScienceCollege of MedicineZhengzhou University

Targeting the PD-1/PD-L1 axis with small-molecular inhibitors is a promising approach for immunotherapy. Here, we identify a natural pentacyclic triterpenoid, Pygenic Acid A(PA), as a PD-1 signaling inhibitor. PA exerts anti-tumor activity in hPD-1 knock-in C57BL/6 mice and enhances effector functions of T cells to promote immune responses by disrupting the PD-1 signaling transduction. Furthermore, we identify SHP-2.as the direct molecular target of PA for inhibiting the PD-1 signaling transduction. Subsequently, mechanistic studies suggest that PA binds to a new druggable site in the phosphorylated PD-1 ITSM recognition site of SHP-2. inhibiting the recruitment of SHP-2.by PD-1. Taken together, our findings demonstrate that PA has a potential application in cancer immunotherapy and occupying the phosphorylated ITSM recognition site of SHP-2.may serve as an alternative strategy to develop PD-1 signaling inhibitors. In addition, our success in target recognition provides a paradigm of target identification and confirmation for natural products.

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Disaster effects of climate change in High Mountain Asia:State of art and scientific challenges Disaster effects of climate change in High Mountain Asia:State of art and scientific challenges

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Advances in Climate Change Research 2024年第3期15卷 367-389页

作者： Hao WANG Bin-Bin WANG Peng CUI Yao-Ming ma Yan WANG Jian-Sheng HAO Yu WANG Ya-Mei LI Li-Jun SUN Jiao WANG Guo-tao ZHANG Wei-Mo LI Yu LEI Wen-Qing ZHAO Jin-Bo TANG Chao-Yue LI Institute of Mountain Hazards and Environment Chinese Academy of SciencesChengdu 610041China State Key Laboratory of Tibetan Plateau Earth System Environment and Resources(TPESER)Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China Institute of Geographic Sciences and Natural resources Research Chinese Academy of SciencesBeijing 100101China china‒Pakistan Joint Research Center on Earth Sciences Chinese Academy of SciencesIslamabad 45320Pakistan College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing 100049China College of Atmospheric Science Lanzhou UniversityLanzhou 730000China National Observation and Research Station for Qomolongma Special Atmospheric Processes and environmental Changes Dingri 858200China

High Mountain Asia(Hma)shows a remarkable warming tendency and divergent trend of regional precipitation with enhanced meteorological *** rapid thawing of the Hma cryosphere may alter the magnitude and frequency of nature *** reviewed the influence of climate change on various types of nature hazards in Hma region,including their phenomena,mechanisms and *** reveals that:1)the occurrences of extreme rainfall,heavy snowfall,and drifting snow hazards are escalating;accelerated ice and snow melting have advanced the onset and increased the magnitude of snowmelt floods;2.due to elevating trigger factors,such as glacier debuttressing and the rapid shift of thermal and hydrological regime of bedrock/snow/ice interface or subsurface,the mass flow hazards including bedrock landslide,snow avalanche,ice-rock avalanches or glacier detachment,and debris flow will become more severe;3)increased active-layer detachment and retrogressive thaw slumps slope failures,thaw settlement and thermokarst lake will damage many important engineering structures and infrastructure in permafrost region;4)multi-hazards cascading hazard in Hma,such as the glacial lake outburst flood(GLOF)and avalanche-induced mass flow may greatly enlarge the destructive power of the primary hazard by amplifying its volume,mobility,and impact force;and 5)enhanced slope instability and sediment supply in the highland areas could impose remote catastrophic impacts upon lowland regions,and threat hydropower security and future water *** future,ongoing thawing of Hma will profoundly weaken the multiple-phase material of bedrock,ice,water,and soil,and enhance activities of nature *** and cascading hazards of high magnitude will prevail in *** the glacier runoff overpasses the peak water,low flow or droughts in lowland areas downstream of glacierized mountain regions will became more frequent and *** escalating hazards in the Hma region requires tackling s

关键词： High Mountain Asia Climate change Cryosphere degradation Nature hazards Disaster risk

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Effects of Amino Acids Replacing Nitrate on Growth,Nitrate Accumulation,and macroelement Concentrations in Pak-choi (Brassica chinensis L.)

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Pedosphere 2007年第5期17卷 595-600页

作者： WANG Hua-Jing WU Liang-Huan WANG Min-Yan ZHU Yuan-Hong tao Qin-Nan ZHANG Fu-Suo Ministry of Education Key Laboratory of environmental Remediation and Ecosystem Health College of Environmental and Resource Sciences Zhejiang University Hangzhou 310029 （China） College of Geography and Resource Sciences Sichuan Normal University Chengdu 610066 （China） Department of Crop and Soil Sciences the Pennsylvania State University （USA） College of resources and Environment China Agricultural University Beijing 100094 （China）

A hydroponic experiment was carried out to determine the influence of replacing 2.% of nitrate-N in nutrient solutions with 2. individual amino acids on growth, nitrate accumulation, and concentrations of nitrogen （N）, phosphorus （P）, and potassium （K） in pak-choi （Brassica chinensis L.） shoots. When 2.% of nitrate-N was replaced with arginine （Arg） compared to the full nitrate treatment, pak-choi shoot fresh and dry weights increased significantly （P ≤ 0.05）, but when 2.% of nitrate-N was replaced with alanine （Ala）, valine （Val）, leucine （Leu）, isoleucine （Ile）, proline （Pro）, phenylalanine （Phe）, methionine （Met）, aspartic acid （Asp）, glutamic acid （Glu）, lysine （Lys）, glycine （Gly）, serine （Ser）, threonine （Thr）, cysteine （Cys）, and tyrosine （Tyr）, shoot fresh and dry weights decreased significantly （P ≤ 0.05）. After replacing 2.% of nitrate-N with asparagine （Asn） and glutamine （Gin）, shoot fresh and dry weights were unaffected. Compared to the full nitrate treatment, amino acid replacement treatments, except for Cys, Gly, histidine （His）, and Arg, significantly reduced （P ≤0.05） nitrate concentrations in plant shoots. Except for Cys, Leu, Pro, and Met, total N concentrations in plant tissues of the other amino acid treatments significantly increased （P ≤ 0.05）. Amino acids also affected total P and K concentrations, but the effects differed depending on individual amino acids. To improve pak-choi shoot quality, Gln and Asn, due to their insignificant effects on pak-choi growth, their significant reduction in nitrate concentrations, and their increase in macroelement content in plants, may be used to partially replace nitrate-N.

关键词： amino acids growth N P and K nitrate accumulation pak-choi

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Efficiency of sediment transport by flood and its control in the Lower yellow River

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Science china(Technological Sciences) 2004年第z1期47卷 173-185页

作者： NI Jinren1, LIU Xiaoyong2. LI Tianhong1, ZHAO ye’an3 & JIN Ling1 1. Department of environmental Engineering, Peking university The Key Laboratory of Water and Sedi- ment Sciences, Ministry of Education, Beijing 100871,{2. 2. General Institute of Water resources and Hydropower Planning and Design, Ministry of Water Re- sources, Beijing 100011,{2. 3. The yellow River Conservancy Commission, Zhengzhou 450003,{2. 1. Department of environmental Engineering Peking University 100871 Beijing China 2. The Key Laboratory of Water and Sediment Sciences Ministry of Education 100871 Beijing China 3. General Institute of Water resources and Hydropower Planning and Design Ministry of Water Resources 100011 Beijing China 4. The yellow River Conservancy Commission 450003 Zhengzhou China

This paper presents the characteristics of sediment transport by flood in the Lower yellow River with the reach from Huayuankou to Gaocun, which is regarded as a typical braided pattern. The Artificial Neural Network Model on Water Use for Sediment Transport (WUST) by flood was established based on the measured data from 1980 to 1998. Consequently, simulations of controlling process of sediment transport by flood were made in terms of the control theory under different scenarios. According to the situation of sediment transport by flood in the Lower yellow River, Open-Loop control system and feedback control system were adopted in system design. In the Open-Loop control system, numerical simulations were made to reveal the relationship between average discharge of flood and the WUST with varying sediment concentrations. The results demonstrate that sediment concentration has significant influence on the controlling process of flood flow to WUST. It is practical and efficient to control WUST if sediment concentration is less than 2. kg/m3. In the feedback control system, controlling processes of sediment concentration and flood discharge for sediment transport were simulated respectively under given conditions, and it was found that sediment transport process could be controlled completely by sediment concentration and discharge at the inlet of the reach from Huayuankou to Gaocun. Using the same method, controlling processes of sediment transport by flood in other reaches in the Lower yellow River were also simulated. For the case of sediment concentration being 2. kg/m3, the optimized controlling discharge ranges from 2.90 to 2.00 m3/s in the lower reach of Huayuankou. This study is also of significance to flood control and flushing sediment in the Lower yellow River with proper operation modes of Xiaolangdi Reservoir.

关键词： the Lower yellow River, flood, sediment transport, efficiency, simulation, control.

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