检索结果-南通市图书馆

Performance and mechanism of carbamazepine removal by FeS-S_(2)O_(8)^(2–)process:experimental investigation and DFT calculations

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Environmental Science & Engineering 2023年第9期17卷 209-220页

作者： xuejun long Jun Luo Zhenxing Zhong Yanxu Zhu Chunjie Zhang Jun Wan Haiyan Zhou Beiping Zhang Dongsheng Xia College of Environmental Engineering Wuhan Textile UniversityWuhan 430200China Engineering Research Center for Clean Production of Textile Printing and Dyeing(Ministry of Education) Wuhan Textile UniversityWuhan 430073China Central&Southern China Municipal Engineering Design and Research Institute Co. Ltd.Wuhan 430010China Soil Environmental Institute Guangdong Provincial Academy of Environmental ScienceGuangzhou 510045China School of Environmental Science and Engineering Huazhong University of Science and TechnologyWuhan 430074China

As persulfate(S_(2)O_(8)^(2-))is being increasingly used as an alternative oxidizing agent,developing lowcost and eco-friendly catalysts for efficient S_(2)O_(8)^(2-)activation is potentially useful for the treatment of wastewater containing refractory organic *** this study,the degradative features and mechanisms of carbamazepine(CBZ)were systematically investigated in a novel FeS-S_(2)O_(8)^(2-)process under near-neutral *** results exhibited that CBZ can be effectively eliminated by the FeS-S_(2)O_(8)^(2-)process and the optimal conditions were:250 mg/L FeS,0.5 mmol/L S_(2)O_(8)^(2-),and pH=*** existence of Cl^(−)(1 and 50 mmol/L)has little influence on the CBZ elimination,while both HCO_(3)^(−) and HPO_(4)^(2−)(1 and 50 mmol/L)significantly suppressed the CBZ removal in the FeS-S_(2)O_(8)^(2-)*** could be degraded via a radical mechanism in the FeS-S_(2)O_(8)^(2-)process,the working radical species(i.e.,SO_(4)•−and•OH)were efficiently formed via the promoted decomposition of S_(2)O_(8)^(2-)by the surface Fe2+on the FeS and the dissolved ferrous ions in *** on the identified oxidized products and Fukui index calculations,a possible degradation pathway of CBZ was *** importantly,a two-stage oxidation mechanism of CBZ elimination was speculated in the FeS-S_(2)O_(8)^(2-)process,the activation of S_(2)O_(8)^(2-)by the surface-active Fe(II)of FeS dominated in the initial 5 min,while homogeneous oxidation reactions played more essential parts than others in the following reaction stage(5–60 min).Overall,this study demonstrated that the FeS-S_(2)O_(8)^(2-)process is capable of removing CBZ from water efficiently.

关键词： FeS S_(2)O_(8)^(2-) Carbamazepine DFT calculations Degradation routes

Preparation of Calcium Cross-linked Nano-Fe3O4 Modified Zeolite Microspheres for Cu^2+ Adsorption from Wastewater

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2020年第6期35卷 1021-1030页

作者： WEI Junchong long xuejun WANG Jia TANG Zheng WANG Tingting KANG Hanyu LIANG Shuang School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China School of Environmental Engineering Wuhan Textile UniversityEngineering Research Centre for Clean Production of Textile Dyeing and PrintingMinistry of EducationWuhan 430200China China Forum of Environmental Journalists Shanxi 710000China Wuhan Radioactive and Dangerous Solid Waste Pollution Management Center Wuhan 430015China School of Resource and Environmental Sciences Wuhan UniversityWuhan 430079China

Artificial zeolite was modified by nano-Fe3O4 for development of functional ***,adsorbents such as calcium cross-linked nano-Fe3O4 microspheres (Ca-MS),calcium cross-linked nano-Fe3O4 modified zeolite microspheres (Ca-MZS) and iron cross-linked nano-Fe3O4 modified zeolite microspheres (Fe-MZS) were prepared and compared for their adsorption *** effects of adsorbent dosage,solution pH,initial concentration and ion content on the removal of Cu^2+ from wastewater are investigated,and the adsorption kinetics and isotherms for the adsorbent materials were *** experimental results indicate that for the initial concentration of Cu^2+ of 30 mg/L,the adsorption is noted to be most *** optimal initial pH for adsorbing Cu^2+ is observed to be *** an optimal dosage of Ca-MZS of 900 mg/L,the adsorption capacity is measured to be 28.25 mg/g,along with the removal rate of 72.49%.The addition of Na+ and K+ affects the adsorption of Cu^2+.For the Na^+ and K^+ concentration of 0.2 mmol/L,the Cu^2+ removal rate by Ca-MZS drops to 11.94% and 22.12%,*** compared with the adsorbents such as Natural Zeolite (NZ),Ca-MS and Fe-MZS,Ca-MZS demonstrates the best removal effect in solution,where the removal rate reaches 84.27%,with the maximum adsorption capacity of 28.09 mg/*** Cu^2+ adsorption kinetics of Ca-MZS is observed to follow the Elovich kinetic model,with the adsorption isotherm data fitting the Freundlich isotherm model by using the non-linear method.

关键词： adsorbent modified zeolite Cu^2+ nano-Fe3O4 microspheres

Research on the slope spectrum of the Loess Plateau

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2008年第S1期51卷 175-185页

作者： TANG GuoAn,LI FaYuan,LIU xuejun,long Yi & YANG Xin Key Laboratory of Virtual Geographic Environment,Nanjing Normal University,Ministry of Education,Nanjing 210046,China Key Laboratory of Virtual Geographic Environment Nanjing Normal University Ministry of Education Nanjing China

A new concept dealing with digital analysis of loess terrain,slope spectrum,is presented and discussed in this paper,by introducing its characteristic,represen-tation and extracting method from DEMs. Using 48 geomorphological units in dif-ferent parts of the loess as test areas and 5 m-resolution DEMs as original test data,the quantitative depiction and spatial distribution of slope spectrum in China's Loess Plateau have been studied on the basis of a series of carefully-designed experiments. In addition,initial experiment indicates a strong relationship between the slope spectrum and the loess landform types,displaying a potential importance of the slope spectrum in geomorphological studies. Based on the slope spectrums derived from the 25 m-resolution DEM data in whole loess terrain in northern part of Shaanxi,13 slope spectrum indices were extracted and integrated into a compre-hensive layer with image integration method. Based on that,a series of unsuper-vised classifications was applied in order to make a landform classification in northern Shaanxi Loess Plateau. Experimental results show that the slope spec-trum analysis is an effective method in revealing the macro landform features. A continuous change of slope spectrum from south to north in northern Shaanxi Loess Plateau shows an obvious spatial distribution of different loess landforms. This also proves the great significance of the slope spectrum method in describing the terrain roughness and landform evolution as well as a further understanding on landform genesis and spatial distribution rule of different landforms in the Loess Plateau.

关键词： Loess Plateau slope spectrum slope DEM loess landform

Ionic liquids as the effective technology for enhancing transdermal drug delivery: Design principles, roles, mechanisms, and future challenges

在线全文

学校读者我要写书评

暂无评论

Asian Journal of Pharmaceutical Sciences 2024年第2期19卷 38-51页

作者： xuejun Chen Ziqing Li Chunrong Yang Degong Yang Department of Pharmacy Shantou University Medical CollegeShantou 515041China Guangdong Provincial Key Laboratory of Infectious Diseases and Molecular Immunopathology Shantou University Medical CollegeShantou 515041China

Ionic liquids (ILs) have been proven to be an effective technology for enhancing drug transdermal absorption. However, due to the unique structural components of ILs, the design of efficient ILs and elucidation of action mechanisms remain to be explored. In this review, basic design principles of ideal ILs for transdermal drug delivery system (TDDS) are discussed considering melting point, skin permeability, and toxicity, which depend on the molar ratios, types, functional groups of ions and inter-ionic interactions. Secondly, the contributions of ILs to the development of TDDS through different roles are described: as novel skin penetration enhancers for enhancing transdermal absorption of drugs;as novel solvents for improving the solubility of drugs in carriers;as novel active pharmaceutical ingredients (API-ILs) for regulating skin permeability, solubility, release, and pharmacokinetic behaviors of drugs;and as novel polymers for the development of smart medical materials. Moreover, diverse action mechanisms, mainly including the interactions among ILs, drugs, polymers, and skin components, are summarized. Finally, future challenges related to ILs are discussed, including underlying quantitative structure-activity relationships, complex interaction forces between anions, drugs, polymers and skin microenvironment, long-term stability, and in vivo safety issues. In summary, this article will promote the development of TDDS based on ILs.

关键词： Transdermal drug delivery system Ionic liquid Quantitative structure-activity relationship Intermolecular interaction

Recent progress on rapid diagnosis of COVID-19 by point-of-care testing platforms

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2024年第3期35卷 66-75页

作者： Ya-Nan Tang Dingding Jiang xuejun Wang Yunqi Liu Dacheng Wei State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular ScienceFudan UniversityShanghai 200433China Institute of Molecular Materials and Devices Fudan UniversityShanghai 200433China

The outbreak of COVID-19 has drawn great attention around the ***-CoV-2 is a highly infectious virus with occult transmission by many mutations and a long incubation *** particular,the emergence of asymptomatic infections has made the epidemic even more ***,early diagnosis and timely management of suspected cases are essential measures to control the spread of the *** simple,portable,and accurate diagnostic techniques for SARS-CoV-2 is the key to epidemic *** advantages of point-of-care testing technology make it play an increasingly important role in viral detection and *** review summarizes the point-of-care testing platforms developed by nucleic acid detection,immunological detection,and nanomaterial-based biosensors ***,this paper provides a prospect for designing future highly accurate,cheap,and convenient SARS-CoV-2 diagnostic technology.

关键词： COVID-19 Point-of-care testing platforms Nucleic acid detection Asymptomatic infection Biosensors

Surveillance-image-based outdoor air quality monitoring

在线全文

学校读者我要写书评

暂无评论

Environmental Science and Ecotechnology 2024年第2期18卷 60-69页

作者： Xiaochu Wang Meizhen Wang xuejun Liu Ying Mao Yang Chen Songsong Dai School of Geography Nanjing Normal UniversityNanjing210023China Key Laboratory of Virtual Geographic Environment Nanjing Normal UniversityMinistry of EducationNanjing210023China Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application Nanjing Normal UniversityNanjing210023China

Air pollution threatens human health,necessitating effective and convenient air quality ***,there has been a growing interest in using camera images for air quality ***,a major challenge has been nighttime detection due to the limited visibility of nighttime *** we present a hybrid deep learning model,capitalizing on the temporal continuity of air quality changes for estimating outdoor air quality from surveillance *** model,which integrates a convolutional neural network(CNN)and long short-term memory(LSTM),adeptly captures spatial-temporal image features,enabling air quality estimation at any time of day,including PM_(2.5) and PM10 concentrations,as well as the air quality index(AQI).Compared to independent CNN networks that solely extract spatial features,our model demonstrates superior accuracy on self-constructed datasets with R^(2)?0.94 and RMSE=5.11 mg m^(-3) for PM_(2.5),R^(2)=0.92 and RMSE=7.30 mg m^(-3) for PM10,and R^(2)=0.94 and RMSE?5.38 for ***,our model excels in daytime air quality estimation and enhances nighttime predictions,elevating overall *** across diverse image datasets and comparative analyses underscore the applicability and superiority of our model,reaffirming its applicability and superiority for air quality monitoring.

关键词： Outdoor air quality estimation Hybrid deep learning model Convolutional neural network long short-term memory Image sequences

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

随机并行梯度下降光束净化实验研究

光学学报 2008年第4期28卷 613-618页

作者：梁永辉王三宏龙学军于起峰国防科学技术大学光电科学与工程学院湖南长沙410073

利用自适应光学技术进行光束净化是高能激光系统中一项重要的研究内容。为实现光束净化系统的小型化和低成本,基于系统性能评价函数无模型最优化的波前畸变校正方法是适合的技术方案。就随机并行梯度下降(SPGD)最优化算法在光束净化系... 详细信息

利用自适应光学技术进行光束净化是高能激光系统中一项重要的研究内容。为实现光束净化系统的小型化和低成本,基于系统性能评价函数无模型最优化的波前畸变校正方法是适合的技术方案。就随机并行梯度下降(SPGD)最优化算法在光束净化系统中的应用展开研究。针对高能激光束常见的像差分布进行了SPGD波前校正的数值模拟,在此基础上构建了37单元自适应光学光束净化实验平台,讨论了双边扰动梯度估计和迭代增益系数自适应变化对算法收敛特性的影响。数值模拟与实验结果验证了SPGD算法对不同程度波前畸变的校正能力,表明了SPGD光束净化方案的可行性。

关键词：自适应光学光束净化随机并行梯度下降系统性能评价函数无模型最优化数值模拟

基于随机并行梯度下降方法的动态光束净化实验研究

在线全文

学校读者我要写书评

暂无评论

光学学报 2009年第1期29卷 97-101页

作者：王三宏梁永辉龙学军于起峰国防科学技术大学光电科学与工程学院湖南长沙410073

高能激光系统中通常包含光束净化装置以对激光器出射光束的波前畸变进行连续校正。为研究随机并行梯度下降自适应光学方法在光束净化问题上的可行性,按算法运行时序连续改变37单元变形镜的面形,以在实验光路中引入高能激光器输出光束的... 详细信息

高能激光系统中通常包含光束净化装置以对激光器出射光束的波前畸变进行连续校正。为研究随机并行梯度下降自适应光学方法在光束净化问题上的可行性,按算法运行时序连续改变37单元变形镜的面形,以在实验光路中引入高能激光器输出光束的常见动态波前畸变,同时采用随机并行梯度下降算法控制同一变形镜对此动态畸变进行校正。实验结果显示,在事先消除系统初始像差的情况下,系统分别以1 kHz和2 kHz的模拟迭代速率工作时,激光束的动态像差都得到了充分抑制,光束质量在整个校正时段内始终维持在较好水平。这表明随机并行梯度下降自适应光学方法应用在光束净化系统中是可行的。

关键词：自适应光学光束净化随机并行梯度下降动态畸变变形镜

Unlocking the potential of amorphous calcium carbonate: A star ascending in the realm of biomedical application

在线全文

学校读者我要写书评

暂无评论

Acta Pharmaceutica Sinica B 2024年第2期14卷 602-622页

作者： Han Liu Zhiyang Wen Zihan Liu Yanfang Yang Hongliang Wang xuejun Xia Jun Ye Yuling Liu State Key Laboratory of Bioactive Substance and Function of Natural Medicines Institute of Materia MedicaChinese Academy of Medical Sciences&Peking Union Medical CollegeBeijing 100050China Beijing Key Laboratory of Drug Delivery Technology and Novel Formulation Institute of Materia MedicaChinese Academy of Medical Sciences&Peking Union Medical CollegeBeijing 100050China

Calcium-based biomaterials have been intensively studied in the field of drug delivery owing to their excellent biocompatibility and ***-based materials can also deliver contrast agents,which can enhance real-time imaging and exert a Ca^(2+)-interfering therapeutic *** on these characteristics,amorphous calcium carbonate(ACC),as a brunch of calcium-based biomaterials,has the potential to become a widely used *** functional ACC can be either discovered in natural organisms or obtained by chemical synthesis However,the standalone presence of ACC is unstable in *** are required to be used as stabilizers or core-shell structures formed by permeable layers or lipids with modified molecules constructed to maintain the stability of ACC until the ACC carrier reaches its *** has high chemical instability and can produce biocompatible products when exposed to an acidic condition in vivo,such as Ca^(2+) with an immune-regulating ability and CO_(2) with an imaging-enhancing *** to these characteristics,ACC has been studied for selfsacrificing templates of carrier construction,targeted delivery of oncology drugs,immunomodulation,tumor imaging,tissue engineering,and calcium *** in this paper has been placed on the origin,structural features,and multiple applications of ***,ACC faces many challenges in clinical translation,and long-term basic research is required to overcome these *** hope that this study will contribute to future innovative research on ACC.

关键词： Amorphous calcium carbonate Drugdelivery system Nanoparticle Acid sensitivity Water instability,Tumortherapy Tissue engineering Calcium supplement