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arXiv 2023年

作者： Scheuer, Julian zhang, xuwen Goethe-Universität Institut für Mathematik Robert-Mayer-Str. 10 Frankfurt60325 Germany School of Mathematical Sciences Xiamen University Xiamen361005 China

For a function f which foliates a one-sided neighbourhood of a closed hypersurface M, we give an estimate of the distance of M to a Wulff shape in terms of the Lp-norm of the traceless F-Hessian of f, where F is the support function of the Wulff shape. This theorem is applied to prove quantitative stability results for the anisotropic Heintze-Karcher inequality, the anisotropic Alexandrov problem, as well as for the anisotropic overdetermined boundary value problem of Serrin-type. Copyright © 2023, The Authors. All rights reserved.

关键词： Boundary value problems

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ALEXANDROV-TYPE THEOREM FOR SINGULAR CAPILLARY CMC HYPERSURFACES IN THE HALF-SPACE

arXiv

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arXiv 2023年

作者： Xia, Chao zhang, xuwen School of Mathematical Sciences Xiamen University Xiamen361005 China Institut für Mathematik Goethe-Universität Frankfurt60325 Germany

In this paper, we consider the classification problem for critical points of relative isoperimetric-type problem in the half-space. Under certain regularity assumption, we prove an Alexandrov-type theorem for the singular capillary CMC hypersurfaces in the half-space. The key ingredient is a new shifted distance function that is suitable for the study of capillary problem in the *** Codes 35J93, 49Q15, 49Q20, 53C45 Copyright © 2023, The Authors. All rights reserved.

关键词： Geometry

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Rosellosides A and B, two phenyloxazole glycosides from Glycyrrhiza inflata-derived fungus Rosellinia sp. Glinf021

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NATURAL PRODUCT RESEARCH 2025年第7期39卷 2036-2040页

作者： Gu, Gan Hou, xuwen zhang, Jiayin Pan, Xiaoqian Xu, Dan Lai, Daowan Zhou, Ligang China Agr Univ Coll Plant Protect Dept Plant Pathol Beijing Peoples R China

Two new chlorinated phenyloxazole glycosides, named rosellosides A (1) and B (2), were isolated from the endophytic fungus Rosellinia sp. Glinf021, which was derived from the medicinal plant Glycyrrhiza inflata (Leguminosae). Both compounds were rare chlorinated polyketide glycosides bearing an oxazole moiety. Their structures were elucidated by analysis of the NMR and HRESIMS data, and their absolute configurations were determined by quantum chemical ECD calculations and X-ray crystallography.

关键词： Endophytic fungus Rosellinia sp. Glinf021 Glycyrrhiza inflata rosellosides A and B chlorinated phenyloxazole glycosides

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Synergistic optimization strategies for the development of multienzymatic cascade system-based electrochemical biosensors with enhanced performance

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BIOSENSORS & BIOELECTRONICS 2025年 274卷 117222页

作者： Zhu, Yuzhuo Cheng, Zhaoming Wang, Xueqi zhang, Chuanjun Li, xuwen Wei, Yanxue Wang, Jiajia Fang, Yuxin Wang, Yi zhang, Di Tianjin Univ Tradit Chinese Med Coll Pharmaceut Engn Tradit Chinese Med Tianjin 301617 Peoples R China Tianjin Univ Tradit Chinese Med Inst Tradit Chinese Med Tianjin 301617 Peoples R China Tianjin Key Lab Intelligent & Green Pharmaceut Tra Tianjin 301617 Peoples R China State Key Lab Chinese Med Modernizat Tianjin 301617 Peoples R China Tianjin Univ Tradit Chinese Med Coll Acumox & Tuina Res Ctr Expt Acupuncture Sci Tianjin 301617 Peoples R China Natl Clin Res Ctr Chinese Med Acupuncture & Moxibu Tianjin 301617 Peoples R China

Multienzymatic cascade system (MCS) strategies have been a topic of growing interest in the electrochemical biosensor research field owing to their many advantages. By combining two or more enzymes in an appropriate manner, MCS approaches can extend the range of detection for particular analytes while improving the overall efficiency of biocatalytic cascade reactions. Compared with mono-enzyme biosensors, the integration of MCS and electrochemical biosensor platforms is inherently more challenging owing to the increased complexity of the resultant system. In recent years, substantial progress in the development of MCS-based electrochemical biosensors with enhanced analytical performance has been made. This review provides an overview of the types of MCS strategies and their biosensor applications, together with a summary of synergistic optimization approaches that can help improve key parameters including sensitivity, selectivity, and stability when designing MCS-based electrochemical biosensors. These discussions include examples of published biosensor platforms (2016-2024) while also surveying key advances in associated research areas including redox mediators/enzyme coimmobilization, enzyme engineering, multienzyme spatial regulation, enzyme-nanozyme integration and others. Lastly, a brief overview of current challenges and future perspectives pertaining to MCS-based electrochemical biosensor design is provided.

关键词： Multienzymatic system Electrochemical biosensor Cascade reaction Synergistic strategy Enzymatic biosensor

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Manginoids A-G: Seven Monoterpene-Shikimate-Conjugated Meroterpenoids with a Spiro Ring System from Guignardia mangiferae

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ORGANIC LETTERS 2017年第21期19卷 5956-5959页

作者： Chen, Keliang zhang, xuwen Sun, Weiguang Liu, Junjun Yang, Jing Chen, Chunmei Liu, Xiulan Gao, Limin Wang, Jianping Li, Hua Luo, Zengwei Xue, Yongbo Zhu, Hucheng zhang, Yonghui Huazhong Univ Sci & Technol Tongji Med Coll Sch Pharm Hubei Key Lab Nat Med Chem & Resource Evaluat Wuhan 430030 Hubei Peoples R China Huazhong Univ Sci & Technol Tongji Med Coll Tongji Hosp Wuhan 430030 Hubei Peoples R China Humanwell Healthcare Grp Co Ltd Wuhan 430073 Hubei Peoples R China Chinese Acad Sci Kunming Inst Bot State Key Lab Phytochem & Plant Resources West Ch Kunming 650204 Yunnan Peoples R China

Manginoids A-G (1-7), seven monoterpene-shikimate-conjugated meroterpenoids with a spiro ring system, were isolated from Guignardia mangiferae. Compounds 1-4 are four isomers with epimeric and double-bond isomeric features possessing a 6-oxaspiro[bicyclo[3.2.1]octane-3,5 '-indene] ring, which represent the first examples of spiro meroterpenoids bearing a bridged spirocyclohexanedione moiety. Compounds 5 and 6 possess an unexpected 2,4-dioxatricyclo[3.3.1.0(3,7)]nonane motif, which fuses with a 6-oxabicyclo[3.2.1]octane moiety. Compound 1 exhibits inhibitory activities against 11 beta-hydroxysteroid dehydrogenase type 1 with an IC50 value of 0.84 mu M.

关键词： Carbon Circular dichroism spectroscopy Chemical structure Absolute configuration Inhibition

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Comprehensive feasibility analysis of carbon dioxide hydrate sequestration: A numerical study based on horizontal well networks

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ENVIRONMENTAL TECHNOLOGY & INNOVATION 2025年 37卷

作者： Li, Yuxuan zhang, Zhaobin Li, Shouding He, Jianming Xie, Zhuoran Li, Xiao Lu, Cheng Qin, xuwen Chinese Acad Sci Inst Geol & Geophys State Key Lab Deep Petr Intelligent Explorat & Dev Beijing 100029 Peoples R China Univ Chinese Acad Sci Coll Earth & Planetary Sci Beijing 100049 Peoples R China Minist Nat Resources China Geol Survey Beijing 100037 Peoples R China

Carbon dioxide sequestration is a crucial strategy for achieving carbon neutrality. This study explores a novel approach to carbon dioxide storage in marine environments in the form of hydrate, addressing the stringent site requirements of traditional geological storage methods. Using a custom-developed simulator, a conceptual model for carbon dioxide sequestration in subsea reservoirs under a horizontal well network configuration was constructed. Key factors, including seawater depth, injection depth, and well spacing, were analyzed through simulations to quantify carbon dioxide storage capacity and assess associated risks under various sequestration scenarios. The results indicate that increasing seawater depth boosts both COQ storage capacity and safety, while deeper injection enhances safety but reduces hydrate storage capacity and raises leakage potential. Closer well spacing improves early-stage safety but increases long-term risks. The study outlines distinct sequestration stages and provides detailed analyses of COQ migration and phase transformations over time, contributing insights for advancing COQ sequestration strategies.

关键词： Carbon dioxide sequestration Hydrate Horizontal well network Seawater depth Injection depth Well spacing

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Research on the Development Strategy of Rural Cooperative Economy in the Post‐Epidemic Era ‐‐ Take the Rural Areas in Northern Anhui Province as an Example

Frontiers in Economics and Management

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Frontiers in Economics and Management 2023年第2期4卷 50-54页

作者： xuwen zhang Han Han Senao Li Jing Yan

In recent years, the development of the rural cooperative economy, the government and how to develop. At present, the coordinated development of rural revitalization and urbanization cannot be separated from the revitalization of the rural economy, which means that how to develop the rural cooperative economy has become an important issue of the current rural revitalization. This project is based on discussing how to develop the rural cooperative economy in northern Anhui. Through literature collection, field investigation and research, data analysis and sorting, combined with the advantages of rural areas in northern Anhui, it analyzes the current bottleneck of development and the factors restricting the development of rural cooperative economy in northern Anhui. Based on the basic situation of the rural cooperative economic development, the country and the Anhui province introduced support of rural cooperative economic development policy with the north of rural cooperative economic development actual situation, on the basis of a series of north of rural cooperative economy development quality countermeasures and Suggestions, innovative to develop two village mutual learning evaluation mechanism, promote land adoption agriculture, construction live help farmers base countermeasures, such as policy support, resources as a whole, innovation consciousness gives the specific path of rural cooperative economic development.

关键词： Rural Revitalization Cooperative Economy Urbanization Development Farmers' Income Increase Production Union

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Comparative analysis of three heating methods for natural gas hydrate production: Electric heating, steam injection, and hot water injection

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APPLIED THERMAL ENGINEERING 2025年 269卷

作者： zhang, Zhaobin Xu, Tao Li, Shouding Guo, Peng Li, Xiao Lu, Cheng Sun, Yiming Wang, Pingkang Qin, xuwen Chinese Acad Sci Inst Geol & Geophys Key Lab Deep Petr Intelligent Explorat & Dev Beijing 100029 Peoples R China Univ Chinese Acad Sci Coll Earth & Planetary Sci Beijing 100049 Peoples R China China Geol Survey China Aero Geophys Survey & Remote Sensing Ctr Nat Beijing 100083 Peoples R China Minist Nat Resources China Geol Survey Oil & Gas Resources Survey Beijing 100083 Peoples R China Natl Engn Res Ctr Gas Hydrate Explorat & Dev Guangzhou 510075 Guangdong Peoples R China

Natural gas hydrates are a promising and environmentally sustainable energy resource, but their commercial production remains challenging. External heating is crucial for improving production efficiency. In this study, we employed a self-developed simulator (IGG-hydrate) to compare the thermal performance of three key heating methods: electric heating (EH), steam injection (SI), and hot water injection (WI). Quantitative indicators, including heating and depressurization thresholds, were introduced to assess the effectiveness of each method. The results demonstrate that external heating significantly facilitates hydrate dissociation, with electric heating and steam injection showing comparable gas production rates and early-stage efficiency. However, both electric heating and steam injection methods can cause localized overheating near injection wells, leading to energy inefficiency. In contrast, hot water injection achieves a more uniform temperature distribution and a broader heating range, while avoiding excessive temperature rise. However, it also reduces depressurization efficiency and increases subsidence near the wells. To optimize performance, we propose a steam-water alternating injection strategy: steam is injected initially for rapid dissociation near the wells, followed by hot water injection to extend the heating range and maintain thermal efficiency with the same equipment.

关键词： Heating method Electric heating Steam injection Hot water injection Hydrate

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Retracted on February 24, 2022: The Order and Disorder of Higher Education System 21

Retracted on February 24, 2022: The Order and Disorder of Hi...

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作者： xuwen zhang Jingming Chi Jing Song Dalian University of Technology China Liaoning Police College China

ISBN: (纸本)9781450385015

NOTICE OF RETRACTION: While investigating potential publication-related misconduct in connection with the ICIMTech 2021 Conference Proceedings, serious concerns were raised that cast doubt on the integrity of the peer-review process and all papers published in the Proceedings of this Conference. The integrity of the entire Conference has been called into question. As a result, of its investigation, ACM has decided to retract the Entire Conference Proceedings and all related papers from the ACM Digital *** of the papers from this Proceeding should be cited in the literature because of the questionable integrity of the peer review process for this Conference.

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A HEINTZE-KARCHER TYPE INEQUALITY FOR HYPERSURFACES WITH CAPILLARY BOUNDARY

arXiv

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arXiv 2022年

作者： Jia, Xiaohan Xia, Chao zhang, xuwen School of Mathematical Sciences Xiamen University Xiamen361005 China

In this paper, we establish a Heintze-Karcher type inequality for hypersurfaces with capillary boundary of contact angle θ ∈ (0, π/2) in a half space or a half ball, by using solution to a mixed boundary value problem in Reilly type formula. Consequently, we give a new proof of Alexandrov type theorem for embedded capillary constant mean curvature hypersurfaces with contact angle θ ∈ (0, π/2) in a half space or a half *** Codes 53C24, 35J25, 53C21 Copyright © 2022, The Authors. All rights reserved.

关键词： Contact angle

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