检索结果-南通市图书馆

Adsorption Effect of Phosphate Modified Grape Branch Biochar on Cd²

在线全文

学校读者我要写书评

暂无评论

Journal of Geoscience and Environment Protection 2024年第4期12卷 59-77页

作者： Yu han Yuming yin Hao Zhang Sijing Sun Zuzhi Huang Yishu Deng Li Bao College of Resources and Environment Yunnan Agricultural University Kunming China Yunnan Soil Fertilization and Pollution Remediation Laboratory Kunming China College of Building Engineering Yunnan Agricultural University Kunming China

Two major problems facing agriculture at present are soil pollution and the disposal of solid wastes generated during plant growth. The method of preparing biochar from solid wastes produced by plants is a means of maximizing the use of resources to combat the problem of soil pollution. In this study, we did not choose straw in the traditional sense but the waste branches from grape pruning, which has higher lignin cellulose, as the raw material. The biochar derived from grape branches pyrolyzed at 300˚C for two hours was utilized as a raw material to prepare modified biochar with varying concentrations of phosphoric acid. The adsorption performance and mechanism of Cd2 were explored through experiments involving different concentrations, addition amounts, reaction times, kinetic analyses, and isothermal adsorption tests. The findings indicated that the optimal adsorption of Cd2 occurred with a 20% phosphoric acid concentration, achieving the highest adsorption rate of 84.62%. At a dosage of 10 g/L, the maximum adsorption capacity reached 7.02 mg/g. The adsorption kinetics and isothermal adsorption of Cd2 on biochar modified with 0.2% phosphoric acid (0.2 PB) closely followed the pseudo-first-order kinetics model (R2 > 0.98) and the Freundlich model (R2 > 0.97), respectively. This suggests that the adsorption process involves both physical and chemical mechanisms. SEM and FTIR analyses revealed that phosphoric acid modification primarily increased the biochar’s specific surface area and enhanced certain original functional groups. The adsorption process predominantly involved rapid ion diffusion and chemical adsorption, as confirmed by kinetic analysis and isothermal adsorption model analysis. In summary, the adsorption efficiency of 0.2 PB significantly improved, showing potential and feasibility for heavy metal remediation in soil. This supports the environmentally friendly concept of “treating waste with w

关键词： Phosphate Modified Grape Branch Biochar Adsorbs Cd

Tuning the Surface Field by Embedding Cations into Metals to Direct the Reaction Pathway of CO_(2) Electroreduction

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

CCS Chemistry 2024年第3期6卷 631-640页

作者： Pei Zhang Meng Zhou Shiqiang Liu Xueqing Xing Jiahao Yang Peng Chen Yaoyu yin yingying Cheng Xing Tong Jun Ma Qinggong Zhu Xiaofu Sun ZhongJun Chen Xinchen Kang Buxing han Beijing National Laboratory for Molecular Sciences CAS Laboratory of Colloid and Interface and ThermodynamicsCAS Research/Education Center for Excellence in Molecular SciencesCenter for Carbon Neutral ChemistryInstitute of ChemistryChinese Academy of SciencesBeijing 100190 Beijing Synchrotron Radiation Facility Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049 Shanghai Key Laboratory of Green Chemistry and Chemical Processes School of Chemistry and Molecular EngineeringEast China Normal UniversityShanghai 200062 School of Chemistry University of Chinese Academy of SciencesBeijing 100049

The creation of universal strategies to affect the reaction route of the electroreduction of CO_(2) is ***,we report the first work to introduce cations into diverse metals such as Cu,Bi,In,and Sn via the electroreduction of related metallic oxides in quaternary ammonium surfactant *** to their physical adsorption,cations embedded into the electrodes have a more pronounced impact on the electrical field,which effectively influences the adsorption state of *** the increase of surface field,the hydrogen evolution reaction and*COOH route are significantly reduced,favouring the*OCHO pathway *** a result,hydrogen,CO,and C_(2+)products almost completely vanish at−0.5 V versus RHE in 0.1 M Na_(2)SO_(4)in an H-type cell after enough cations are embedded into the Cu electrode,and the faradaic efficiency of formate rises from 18.0%to 99.5%simultaneously.

关键词： CO_(2)electroreduction tuneable products electrical field reaction pathway cations embedding

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

半金属氢氧化物材料用于电化学水氧化

Science China Materials 2024年第5期67卷 1551-1558页

作者：王静 Mohammed-Ibrahim Jamesh 高强韩波孙睿敏 Hsien-Yi hsu 周成冈蔡钊 Faculty of Materials Science and Chemistry China University of GeosciencesWuhan430074China School of Energy and Environment Department of Materials Science and EngineeringCity University of Hong KongKowloon TongHong Kong999077China

寻找具有高本征活性的水氧化催化剂材料对许多清洁能源技术的发展至关重要.氢氧化物半导体对析氧反应具有一定的电催化活性.然而,该材料导电性较差,限制着其电催化本征活性的提升.本文提出一种兼具高导电性和高催化活性的半金属氢氧化... 详细信息

寻找具有高本征活性的水氧化催化剂材料对许多清洁能源技术的发展至关重要.氢氧化物半导体对析氧反应具有一定的电催化活性.然而,该材料导电性较差,限制着其电催化本征活性的提升.本文提出一种兼具高导电性和高催化活性的半金属氢氧化物析氧电催化材料.通过阳离子掺杂和阴离子空位协同作用,镍铁水滑石半导体可转化为半金属材料,其电阻率降低了两个数量级.相应半金属氢氧化物阵列电极的电催化活性显著提升,在10 mA cm^(-2)电流密度下其析氧过电势仅为195 mV,Tafel斜率仅为40.9 mV dec^(-1),显著优于商用RuO_(2)催化剂(316 mV,99.6 mV dec^(-1)).原位拉曼光谱和理论计算结果表明,半金属氢氧化物可在较低过电位下转化为羟基氧化物中间体,有助于高价态金属活性位点的形成与稳定,从而提升材料的析氧本征活性.本研究表明,兼具优异导电性和催化活性的半金属氢氧化物可作为先进的电极材料.

关键词： electrocatalyst hydroxide semi-metal electric conductivity intrinsic activity

Abnormal adipose tissue-derived microbes drive metabolic disorder and exacerbate postnatal growth retardation in piglet

在线全文

学校读者我要写书评

暂无评论

Life Metabolism 2024年第2期3卷 55-69页

作者： Tongxing Song Ming Qi Yucheng Zhu Nan Wang Zhibo Liu Na Li Jiacheng Yang Yanxu han Jing Wang Shiyu Tao Zhuqing Ren Yulong yin Jinshui Zheng Bie Tan College of Animal Science and Technology Huazhong Agricultural UniversityWuhanHubei 430070China College of Animal Science and Technology Hunan Agricultural UniversityChangshaHunan 410000China Laboratory of Animal Nutritional Physiology and Metabolic Process CAS Key Laboratory of Agro-ecological Processes in Subtropical RegionNational Engineering Laboratory for Pollution Control and Waste Utilization in Livestock and Poultry ProductionInstitute of Subtropical AgricultureChinese Academy of SciencesChangshaHunan 410125China State Key Laboratory of Agricultural Microbiology Huazhong Agricultural UniversityWuhanHubei 430070China Hubei Key Laboratory of Agricultural Bioinformatics Huazhong Agricultural UniversityWuhanHubei 430070China

Postnatal growth retardation(PGR)frequently occurs during early postnatal development of piglets and induces high *** date,the mechanism of PGR remains poorly *** tissue-derived microbes have been documented to be associated with several disorders of metabolism and body ***,the connection between microbial disturbance of adipose tissue and pig PGR remains ***,we investigated piglets with PGR and found that the adipose tissue of PGR piglets was charac-terized by metabolism impairment,adipose abnormality,and specific enrichment of culturable bacteria from *** of Sphingomonas paucimobilis,a species of Sphingomonas genus from the alphaproteobacteria,induced PGR in ***,this bacterium could also lead to metabolic disorders and susceptibility to acute stress,resulting in weight loss in ***,multi-omics analysis indicated the changes in lipid metabolism as a response of adipose tissue to abnormal microbial *** experimental tests proved that one of the altered lipids phosphatidylethanolamines could rescue the metabolism disorder and growth retardation,thereby suppressing the amount of Sphingomonas in the adipose ***,these results highlight that the microbe–host crosstalk may regulate the metabolic function of adipose tissue in response to PGR.

关键词： adipose tissue microbe metabolic disorder postnatal growth retardation piglet

Human-induced pluripotent stem cell-derived neural stem cell exosomes improve blood-brain barrier function after intracerebral hemorrhage by activating astrocytes via PI3K/AKT/MCP-1 axis

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第2期20卷 518-532页

作者： Conglin Wang Fangyuan Cheng Zhaoli han Bo Yan Pan Liao Zhenyu yin Xintong Ge Dai Li Rongrong Zhong Qiang Liu Fanglian Chen Ping Lei Department of Geriatrics Tianjin Medical University General HospitalTianjinChina School of Medicine Nankai UniversityTianjinChina Tianjin Neurological Institute TianjinChina

Cerebral edema caused by blood-brain barrier injury after intracerebral hemorrhage is an important factor leading to poor ***-induced pluripotent stem cell-derived neural stem cell exosomes(hiPSC-NSC-Exos)have shown potential for brain injury repair in central nervous system *** this study,we explored the impact of hiPSC-NSC-Exos on blood-brain barrier preservation and the underlying *** results indicated that intranasal delivery of hiPSC-NSC-Exos mitigated neurological deficits,enhanced blood-brain barrier integrity,and reduced leukocyte infiltration in a mouse model of intracerebral ***,hiPSC-NSC-Exos decreased immune cell infiltration,activated astrocytes,and decreased the secretion of inflammatory cytokines like monocyte chemoattractant protein-1,macrophage inflammatory protein-1α,and tumor necrosis factor-αpost-intracerebral hemorrhage,thereby improving the inflammatory *** sequencing indicated that hiPSC-NSC-Exo activated the PI3K/AKT signaling pathway in astrocytes and decreased monocyte chemoattractant protein-1 secretion,thereby improving blood-brain barrier *** with the PI3K/AKT inhibitor LY294002 or the monocyte chemoattractant protein-1 neutralizing agent C1142 abolished these *** summary,our findings suggest that hiPSC-NSC-Exos maintains blood-brain barrier integrity,in part by downregulating monocyte chemoattractant protein-1 secretion through activation of the PI3K/AKT signaling pathway in astrocytes.

关键词： AKT astrocyte blood-brain barrier cerebral edema exosomes human-induced pluripotent stem cells intracerebral hemorrhage neural stem cells neuroinflammation PI3K

Half-integer Shapiro steps in MgB_(2) focused He ion beam Josephson junctions

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2024年第8期33卷 483-489页

作者：殷大利蔡欣炜徐铁权孙瑞宁韩颖张焱王越甘子钊 Applied Superconductivity Center State Key Laboratory for Mesoscopic PhysicsSchool of PhysicsPeking UniversityBeijing 100871China

Half-integer microwave induced steps(Shapiro steps)have been observed in many different Josephson junction systems,which have attracted a lot of attention because they signify the deviation of current phase relation(CPR)and uncover many unconventional physical *** this article,we first report the discovery of half-integer Shapiro steps in MgB_(2)focused He ion beam(He-FIB)Josephson *** half-integer steps'dependence on microwave frequency,temperature,microwave power,and magnetic field is also *** find that the existence of half-integer steps can be controlled by the magnetic field periodically,which is similar to that of high temperature superconductor(HTS)grain boundary junctions,and the similarity of the microstructures between gain boundary junctions and He-FIB junctions is *** a consequence,we mainly attribute the physical origin of half-integer steps in MgB_(2)He-FIB junctions to the model that a He-FIB junction is analogous to a parallel junctions'*** results show that He-FIB technology is a promising platform for researching CPR in junctions made of different superconductors.

关键词： Josephson junction half-integer Shapiro steps MgB_(2) focused helium ion beam

中国式战略管理自主知识体系的建构——基于对《孙子兵法》的解读

在线全文

学校读者我要写书评

暂无评论

中国人民大学学报 2024年第2期38卷 56-71页

作者：刘刚唐寅梁晗中国人民大学商学院首都经济贸易大学工商管理学院

充分运用中华优秀传统文化的宝贵资源,对“兵学圣典”《孙子兵法》中的战略管理思想进行创造性转化、创新性发展,力求建构一个中国式战略管理自主知识体系,为世界百年未有之大变局下中国企业提升战略管理水平提供强有力的思想指引,也为... 详细信息

充分运用中华优秀传统文化的宝贵资源,对“兵学圣典”《孙子兵法》中的战略管理思想进行创造性转化、创新性发展,力求建构一个中国式战略管理自主知识体系,为世界百年未有之大变局下中国企业提升战略管理水平提供强有力的思想指引,也为世界战略管理理论的发展贡献中国智慧。这一中国式战略管理自主知识体系建构于兵家思想独具特色的概念体系的基础之上,形成了既逻辑严密又有助于与西方现代战略管理理论有效对接的“战略管理价值—战略管理主体—战略管理过程”框架体系以及包含人本思维、系统思维、辩证思维、博弈思维在内的独树一帜的思维体系。

关键词：战略管理自主知识体系中国式管理《孙子兵法》

“人口流动”视域下中国城市中心性和社群格局分析

在线全文

学校读者我要写书评

暂无评论

地球信息科学学报 2024年第3期26卷 666-678页

作者：尹延中邬群勇林瀚赵志远福州大学空间数据挖掘与信息共享教育部重点实验室福州350108 卫星空间信息技术综合应用国家地方联合工程研究中心福州350108 数字中国研究院(福建) 福州350003

城市网络的组织结构与运行机制离不开城市间的关联关系。本文基于2021年10月至2022年9月的百度迁徙大数据,构建了中国366个城市的城际人口流动网络。在节点层面,提出了城际人口流动超越指数衡量城市中心性,探索城市中心性的空间聚类特征... 详细信息

城市网络的组织结构与运行机制离不开城市间的关联关系。本文基于2021年10月至2022年9月的百度迁徙大数据,构建了中国366个城市的城际人口流动网络。在节点层面,提出了城际人口流动超越指数衡量城市中心性,探索城市中心性的空间聚类特征;在网络社区层面,分析了中国366个城市的月际城际人口流动特征及社群格局。结果表明:(1)城际人口流动超越指数能够有效表征城际人口流动网络中各城市的中心性;(2)城际人口流动网络中各城市根据其中心性形成“高高”集聚分布和“低低”集聚分布的特征;(3)城际人口流动集聚格局受节假日因素、新型冠状病毒感染等综合影响,在不同月份表现出不同的特征,总体上符合地理学第一定律,并呈现省际分异特征;(4)城市凝聚子群发现结果表明,成渝、大湾区、中原、关中平原、长三角等城市群人口流动格局较为稳定,具有跨省人口流动融合特征;山东半岛城市群与京津冀城市群的人口流动格局联系密切,出现跨城市群人口流动特征;浙江省省域内人口流动特征逐渐加强;长江中游、海峡西岸城市群仍未形成跨越省界的稳定人口流动社群格局。

关键词：城市中心性城市相互作用社区检测城际人口流动网络格局百度迁徙数据城际人口流动超越指数区域协调发展城市群

在线全文

学校读者我要写书评

暂无评论

局部一致性主动学习的源域无关开集域自适应

软件学报 2024年第4期35卷 1651-1666页

作者：王帆韩忠义苏皖尹义龙山东大学软件学院山东济南250101

无监督域自适应在解决训练集(源域)和测试集(目标域)分布不一致的问题上已经取得了一定的成功.在面向低能耗场景和开放动态任务环境时,在资源约束和开放类别出现的情况下,现有的无监督域自适应方法面临着严峻的挑战.源域无关开集域自适... 详细信息

无监督域自适应在解决训练集(源域)和测试集(目标域)分布不一致的问题上已经取得了一定的成功.在面向低能耗场景和开放动态任务环境时,在资源约束和开放类别出现的情况下,现有的无监督域自适应方法面临着严峻的挑战.源域无关开集域自适应(SF-ODA)旨在将源域模型中的知识迁移到开放类出现的无标签目标域,从而在无源域数据资源的限制下辨别公共类和检测开放类.现有的源域无关开集域自适应的方法聚焦于设计准确检测开放类别的源域模型或增改模型的结构.但是,这些方法不仅需要额外的存储空间和训练开销,而且在严格的隐私保护场景下难以实现.提出了一个更加实际的场景:主动学习的源域无关开集域自适应(ASF-ODA),目标是基于一个普通训练的源域模型和少量专家标注的有价值的目标域样本来实现鲁棒的迁移.为了达成此目标,提出了局部一致性主动学习(LCAL)算法.首先,利用目标域中局部特征标签一致的特点,LCAL设计了一种新的主动选择方法:局部多样性选择,来挑选更有价值的阈值模糊样本来促进开放类和公共类分离.接着,LCAL基于信息熵初步筛选出潜在的公共类集合和开放类集合,并利用第一步得到的主动标注样本对这两个集合进行匹配纠正,得到两个对应的可信集合.最后,LCAL引入开集损失和信息最大化损失来进一步促使公共类和开放类分离,引入交叉熵损失来实现公共类的辨别.在Office-31、Office-Home和VisDA-C这3个公开的基准数据集上的大量实验表明:在少量有价值的目标域样本的帮助下,LCAL不仅显著优于现有的源域无关开集域自适应方法,还大幅度超过了现有的主动学习方法的表现,在某些迁移任务上可以提升20%.

关键词：资源约束开集识别源域无关域自适应开集域自适应主动学习