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Simple fabrication of carboxymethyl cellulose and k-carrageenan composite aerogel with efficient performance in removal of fluoroquinolone antibiotics from water

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Frontiers of Environmental Science & Engineering 2022年第10期16卷 105-118页

作者： Na Li Boqiang Gao ran yang Hu yang State Key Laboratory of Pollution Control and Resource Reuse School of the EnvironmentNanjing UniversityNanjing 210023China Department of Environmental Science School of Tropical and Laboratory MedicineHainan Medical UniversityHaikou 571199China

3D composite aerogels(CMC-CG)composed of carboxymethyl cellulose andκ-carrageenan were designed and fabricated using the one-pot synthesis *** optimized CMC-CG showed a good mechanical property and a high swelling ratio due to its superior textural properties with a proper chemically cross-linked interpenetrating network ***-CG was utilized for the removal of various fluoroquinolones(FQs)from water and exhibited high adsorption performance because of effective electrostatic attraction and hydrogen bonding ***(CIP),a popular FQ,was used as the *** optimized CMC-CG had a theoretically maximal CIP uptake of approximately 1.271 mmol/g at the pH of *** adsorption capacity of CMC-CG was improved in the presence of some cations,Cu2+and Fe3+ions,at a low concentration through the bridging effect but was reduced at a high *** investigation of adsorption mechanisms,based on the adsorption kinetics,isotherms and thermodynamic study,Fourier transform infrared spectrometry and X-ray photoelectron spectroscopy analyses before and after adsorption,and changes in the adsorption performance of CMC-CG toward two molecular probes,further indicated that electrostatic attraction was the dominant interaction rather than hydrogen bonding in this ***-CG after saturated adsorption of CIP could be easily regenerated using a dilute NaCl aqueous solution and reused ***,the disused aerogel could still be reused as a new adsorbent for effective adsorption of Cu2+***,this study suggested the promising applications of this composite aerogel as an eco-friendly,cost-effective,and recyclable adsorbent for thie efficient removal of FQs from water.

关键词： Composite aerogel of carboxymethy lcellulose andκ-carrageenan Fluoroquinolone antibiotics Adsorption performance Coexisting substances Adsorption mechanism Reusability

Continuous-time Distributed Heavy-ball Algorithm for Distributed Convex Optimization over Undirected and Directed Graphs

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Machine Intelligence Research 2022年第1期19卷 75-88页

作者： Hao-ran yang Wei Ni School of Science Nanchang UniversityNanchang 330031China

This paper proposes second-order distributed algorithms over multi-agent networks to solve the convex optimization problem by utilizing the gradient tracking strategy, with convergence acceleration being achieved. Both the undirected and unbalanced directed graphs are considered, extending existing algorithms that primarily focus on undirected or balanced directed graphs. Our algorithms also have the advantage of abandoning the diminishing step-size strategy so that slow convergence can be avoided. Furthermore, the exact convergence to the optimal solution can be realized even under the constant step size adopted in this paper. Finally, two numerical examples are presented to show the convergence performance of our algorithms.

关键词： Distributed convex optimization second-order distributed algorithm multi-agent systems gradient tracking directed graph

Cucurbit[n]urils(n=7,8)can strongly bind neutral hydrophilic molecules in water

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Science China Chemistry 2022年第9期65卷 1733-1740页

作者： Ming-Shuang Li Mao Quan Xi-ran yang Wei Jiang School of Chemistry and Chemical Engineering Harbin Institute of TechnologyHarbin 150001China Shenzhen Grubbs Institute Guangdong Provincial Key Laboratory of CatalysisDepartment of ChemistrySouthern University of Science and TechnologyShenzhen 518055China

It is challenging to recognize neutral hydrophilic molecules in *** use of hydrogen bonds in water is generally accepted to be the key to *** contrast,hydrophobic cavity is usually considered to play an insignificant role or only to provide a nonpolar microenvironment for hydrogen ***,we report that hydrophobic cavity alone can also strongly bind neutral,highly hydrophilic molecules in *** found that cucurbit[n]urils(n=7,8)bind 1,4-dioxane,crown ethers and monosaccharides in water with remarkable *** best binding constant reaches 10^(7) M^(−1) for cucurbit[8]uril,which is higher than its binding affinities to common organic *** functional theory(DFT)calculations and control experiments reveal that the hydrophobic effect is the major contributor to the binding through releasing the cavity water and/or properly occupying the weakly hydrated ***,hydrophobic cavity still prefers nonpolar guests over polar guests with similar size and shape.

关键词： molecular recognition the hydrophobic effect hydrophilic molecules cucurbit[n]uril naphthotube

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Sandwich-structured In-Ga alloy phase change thermal pad with low thermal resistance and leakage prevention

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Rare Metals 2024年第12期43卷 6639-6648页

作者： Ping-Jun Luo Xu Huang Hao-ran yang Sheng Chu School of Materials Science and Engineering Sun Yat-Sen University

With the rapid increase in chip integration and power density,there is a growing need to develop advanced thermal interface materials for effective thermal *** metals with high thermal conductivity,excellent gap-filling capability and non-toxicity have received much ***,low-melting-point metals,such as galinstan and indium-bismuth-tin（EInBiSn） eutectic alloys,are prone to leaking,which limits their *** this study,In-Ga alloy composite thermal pads with a sandwich structure and a graphite film as an intermediate layer were *** In-Ga alloy composition was adjusted so that these pads underwent partial phase change in the operating temperature range of the laptop CPU（50-100℃）.This results in low thermal resistance and leakage *** thermal resistance of the InGa5,InGa15 and InGa25 alloy thermal pads decreases to 7.3,4.1 and 2.66 K·mm2·W-1,respectively,at a temperature and pressure of 100℃ and 50 *** a test measuring the actual cooling effect of the fabricated material on a CPU,the InGa 15 alloy thermal pad maintained the average CPU temperature at 90.1 0C,significantly better than the EInBiSn thermal pad with an average CPU temperature of 94.1 0C,and comparable to Galinstan,which had an average CPU temperature of 89.3 ℃.Due to their good heat dissipation and leak-proof properties,InGa alloy composite thermal pads are expected to become a new generation of thermal interface materials.

关键词： Composite thermal pad In–Ga alloy Leakage prevention Low thermal resistance Phase change

Novel modified pectin for heavy metal adsorption

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Chinese Chemical Letters 2007年第3期18卷 325-328页

作者： Feng Ting Li Hong yang Yan Zhao ran Xu State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and Engineering Tongji University Shanghai 200092 China

Modified pectin cross-linked with adipic acid, was synthesized and used for heavy metal removal from wastewater. SEM and FTIR were used to investigate its structure and morphology. The modified pectin had a rough, porous phase covered with carboxy groups, resulting a high adsorption capacity. And at the room temperature, the saturated loading capacity for Pb^2＋, Cu^2＋ and Zn^2＋ reached 1.82 retool/g, 1.794 mmol/g and 0.964 retool/g, respectively. The results proved its potential application to remove of the heavy metal.

关键词： Modified pectin Adsorption Heavy metal

Factors affecting the adoption of on-farm milk safety measures in Northern China-An examination from the perspective of farm size and production type

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Journal of Integrative Agriculture 2019年第2期18卷 471-481页

作者： yang Xin-ran Kevin Z.Chen KONG Xiang-zhi Institute of Agricultural Economics and Development Chinese Academy of Agricultural SciencesBeijing 100081P.R.China China Academy for Rural Development Zhejiang UniversityHangzhou 310058P.R.China International Food Policy Research Institute WashingtonDC 20005USA School of Agricultural Economics and Rural Development Renmin University of ChinaBeijing 100872P.R.China

The cow stock of smallholder farmers with less than 100 cows still accounted for nearly 50% of total cows in China. Since the milk scandal occurred in 2008, raw milk safety has become focus for the sound development of the Chinese dairy industry. Adoption of on-farm milk safety measures by smallholders is a key for ensuring milk safety, and these measures are largely voluntary in nature. The recent survey conducted in northern China reveals that an overall adoption rate of various milk safety measures by smallholders is close to 48% with wide variations across the dairy farmers. We employ the Poisson regression model to study the determinants of farmers' adoption of voluntary milk safety measures. Compared with backyard dairy farmers, dairy complex and scaled dairy farms adopted more milk safety measures. Moreover, the empirical result indicates that farmers' adoption of raw milk safety measures is positively affected by farm size. These findings suggest that the changing dairy production structure towards larger farms and away from backyard dairy farming prompts smallholder dairy farmers to adopt more raw milk safety measures. This lends some support to the role of recent policy initiatives towards larger farms and away from backyard dairy farming on increasing the farmers' milk safety practices and reducing on-farm incidence of milk safety.

关键词： raw milk safety farm size production type

Land Use/Cover Change and Its Policy Implications in Typical Agriculture-forest Ecotone of Central Jilin Province,China

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Chinese Geographical Science 2021年第2期31卷 261-275页

作者： DONG Yulin REN Zhibin FU Yao yang ran SUN Hongchao HE Xingyuan Key Laboratory of Wetland Ecology and Environment Northeast Institute of Geography and AgroecologyChinese Academy of SciencesChangchun 130102China University of Chinese Academy of Sciences Beijing 100049China School of Geography and Engineering of Land Resources Yuxi Normal UniversityYuxi 653100China College of Earth Sciences Jilin UniversityChangchun 130012China

During the 21st century,policies toward agriculture,forestry,and urbanization have emerged to ensure food security,ecological restoration,and human well-being by managing land in Northeast ***,the integrated effects and relationships of various policies are still not well *** study observed the land use land cover changes in Central Jilin from 2000 to 2019 and,by considering policy involvement,aimed to understand the effects and trade-offs of *** showed that the cropland,including dryland and rice paddy,and the forest,including coniferous forest and deciduous forest,are dominant land types in Central *** 2000–2019,the land changed diversely,of which the main changes were the expanded dryland(+0.43 million ha),the increased deciduous forest(+22 million ha),the decreased coniferous forest(–0.08 million ha),and the expanded urban settlement(+0.04 million ha).With these changes,despite the unit grain yield showing a rising trend,the yield contribution of Central Jilin to the national total *** poor cultivating structure made for the cropland expansion and reduced the implementation space of environmental restoration projects such as the Grain to ***,in Central Jilin that transits from the agri-food production zone to the eco-regulation zone,environmental projects coexisted in a trade-off manner with agricultural policies that aim to liberate agricultural *** the key urban agglomerations of Central Jilin,the increase in the proportion of green space improved the thermal environment and carbon *** gross domestic product of the large city and its local proportion also *** improvements benefited from the promotion of development policies and urbanization policies at key time *** the future,it is necessary to coordinate agricultural policies and environmental projects and promote the progress of small-and medium-sized cities to ensure the equality of regional *** study

关键词： land use land cover(LULC) policy agriculture-forest ecotone urbanization Northeast China

Recent advance of fluorescent probes for detection of drug-induced liver injury markers

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Chinese Chemical Letters 2022年第10期33卷 4478-4494页

作者： Dongqin Sun Zhenzhen Chen Jiali Hu Huajin Zeng Lingbo Qu ran yang School of Pharmaceutical Sciences Zhengzhou UniversityZhengzhou 450001China The College of Chemistry Zhengzhou UniversityZhengzhou 450001China

Drug-induced liver injury(DILI)is a common and serious adverse drug *** present,DILI is perfectly diagnozed in clinical settings using Roussel Uclaf causality assessment method(RUCAM)in its original version published 1993 and its updated version published 2016,well established worldwide as a diagnostic algorithm with a high sensitivity and ***,the search for additional detection methods supporting RUCAM *** recent years,with the development of optical imaging technology,fluorescent probes have gradually shown great advantages in the detection and diagnosis of DILI markers such as high sensitivity,anti-interference,real-time monitoring and non-invasive *** this review,the recent advances of fluorescent probes for evaluation of DILI in experimental studies were summarized according to various markers of *** believe that learning about the design and practical application of these probes will contribute to the further development of detection sensors for DILI markers.

关键词： Fluorescent probe Drug-induced liver injury(DILI) Roussel uclaf causality assessment method(RUCAM) Clinical markers Imaging

Recent advances in polymeric biomaterials-based gene delivery for cartilage repair

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Bioactive Materials 2020年第4期5卷 990-1003页

作者： ran yang Fei Chen Jinshan Guo Dongfang Zhou Shifang Luan State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun130022PR China School of Pharmaceutical Sciences Southern Medical UniversityGuangzhou510515PR China College of Applied Chemistry and Engineering University of Science and Technology of ChinaHefei230026PR China Center for Materials Synthetic Biology CAS Key Laboratory of Quantitative Engineering BiologyShenzhen Institute of Synthetic BiologyShenzhen Institutes of Advanced TechnologyChinese Academy of SciencesShenzhen518055PR China Department of Histology and Embryology School of Basic Medical SciencesSouthern Medical UniversityGuangzhou510515PR China

Untreated articular cartilage damage normally results in osteoarthritis and even disability that affects millions of ***,both the existing surgical treatment and tissue engineering approaches are unable to regenerate the original structures of articular cartilage durably,and new strategies for integrative cartilage repair are *** therapy provides local production of therapeutic factors,especially guided by biomaterials can minimize the diffusion and loss of the genes or gene complexes,achieve accurate spatiotemporally release of gene products,thus provideing long-term treatment for cartilage *** widespread application of gene therapy requires the development of safe and effective gene delivery vectors and supportive gene-activated *** them,polymeric biomaterials are particularly attractive due to their tunable physiochemical properties,as well as excellent adaptive *** paper reviews the recent advances in polymeric biomaterial-guided gene delivery for cartilage repair,with an emphasis on the important role of polymeric biomaterials in delivery systems.

关键词： Cartilage repair Gene therapy Polymeric biomaterials Delivery vectors Gene-activated matrices