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染料与染色 2024年第2期61卷 21-24页

作者：陈庆林杜建国张旭雯阮晨峰余自琳浙江闰土染料有限公司绍兴312300

本文对阳离子黄X-5GL合成工艺进行了优化。以产品纯度、强度以及色光为指标,采用单因素分析的方法分析了重氮反应体系硫酸含量、偶合反应温度、母体转晶温度以及盐析pH对染料的影响,得到了该染料的最佳制备工艺:重氮反应体系硫酸含量9%... 详细信息

本文对阳离子黄X-5GL合成工艺进行了优化。以产品纯度、强度以及色光为指标,采用单因素分析的方法分析了重氮反应体系硫酸含量、偶合反应温度、母体转晶温度以及盐析pH对染料的影响,得到了该染料的最佳制备工艺:重氮反应体系硫酸含量9%,偶合反应温度0℃,母体转晶温度40℃,盐析pH为5,在此条件下得到的阳离子黄X-5GL母体纯度98.94%,强度670%,色光为近似,绿0.05。

关键词：阳离子黄X-5GL 重氮反应偶合反应盐析

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Fundamental Issues Towards Unified Design Theory of Recycled and Natural Aggregate Concrete Components

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Engineering 2023年第10期29卷 188-197页

作者： Jianzhuang Xiao Kaijian zhang Tao Ding Qingtian zhang xuwen Xiao Department of Structural Engineering Tongji UniversityShanghai 200092China College of Civil Engineering and Architecture Guangxi UniversityNanning 530004China College of Civil Engineering Fuzhou UniversityFuzhou 350116China

In the past 20 years,recycled aggregate concrete(RAC),as a type of low-carbon concrete,has become a worldwide focus of ***,the design methodology for RAC structural components remains a ***,demands for a unified design of natural aggregate concrete(NAC)and RAC components have been ***,this study analyses the necessity of a unified design theory and provides an in-depth demonstration of the strength determination,compressive constitutive relationship,and design method of concrete *** coefficient of variation of RAC strength is found to be generally higher than that of NAC *** compressive and tensile strengths of RAC can be defined and determined using the same method as that used for *** uniaxial compressive constitutive relationship between NAC and RAC has a unified mathematical ***,the elastic modulus of RAC decreases,and its brittleness exhibits an increasing trend compared with that of ***,to unify the design formulae of RAC and NAC components for bearing capacity,modification factors for RAC components are proposed considering safety and ***,the feasibility of the proposed unified time-dependent design theory is demonstrated in terms of conceptual design and structural measures considering the effects of strength degradation and reinforcement *** is believed that this study enriches and develops the basic theory of concrete structures.

关键词： Recycled aggregate concrete(RAC) Natural aggregate concrete(NAC) Strength determination Constitutive relation Reliability Unified design theory

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On regime changes in text data using hidden Markov model of contaminated vMF distribution

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DATA MINING AND KNOWLEDGE DISCOVERY 2024年第6期38卷 3563-3589页

作者： zhang, Yingying Sarkar, Shuchismita Chen, Yuanyuan Zhu, xuwen Western Michigan Univ Kalamazoo MI 49008 USA Bowling Green Univ Bowling Green OH 43402 USA Univ Alabama Tuscaloosa AL 35487 USA

This paper presents a novel methodology for analyzing temporal directional data with scatter and heavy tails. A hidden Markov model with contaminated von Mises-Fisher emission distribution is developed. The model is implemented using forward and backward selection approach that provides additional flexibility for contaminated as well as non-contaminated data. The utility of the method for finding homogeneous time blocks (regimes) is demonstrated on several experimental settings and two real-life text data sets containing presidential addresses and corporate financial statements respectively.

关键词： Finite mixture model Model-based clustering Hidden Markov model Von-Mises Fisher distribution Regime change EM algorithm

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我国保障性住房“有效供给”的悖论与破解

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新疆社会科学 2020年第6期 127-133,145页

作者：李永安张旭文宜春学院经济管理学院江西宜春336000 江西财经大学经济学院江西南昌330013

我国保障性住房制度对彰显社会主义公平价值、弥补房改后的房价非理性上涨之弊意义重大。但是,我国保障性住房供给存在着有效性不足问题,至少在保障性住房制度实施过程中陷入四重悖论。一是"可负担性"成本控制与保障房制度可... 详细信息

我国保障性住房制度对彰显社会主义公平价值、弥补房改后的房价非理性上涨之弊意义重大。但是,我国保障性住房供给存在着有效性不足问题,至少在保障性住房制度实施过程中陷入四重悖论。一是"可负担性"成本控制与保障房制度可持续要求的悖论;二是保障房产权"完整性"流转要求与产权"约束性"工具的悖论;三是保障户身份的信用不足与保障户较高住房金融需求的悖论;四是保障户获得住房保障资格与导致更高生活工作成本的悖论。为此,要通过机制创新破解四重悖论,增强我国保障性住房供给的有效性。

关键词：保障性住房有效供给成本控制产权约束悖论

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Employing supercritical n-butanol to remove the EVA film for the delamination of photovoltaic laminated module

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JOURNAL OF SUPERCRITICAL FLUIDS 2025年 219卷

作者： Wang, xuwen Liu, Zhifeng Ruan, Haoda Li, Xinyu zhang, Lei Hefei Univ Technol Sch Mech Engn Hefei 230009 Peoples R China Anhui Prov Key Lab Low Carbon Recycling Technol & Hefei 230009 Peoples R China State Key Lab Environm Adaptabil lndustrial Prod Guangzhou 510300 Peoples R China

The rapid advancement of the photovoltaic (PV) industry has elevated the recycling and reuse of decommissioned PV modules to critical challenges, essential for tackling environmental concerns and achieving resource reutilization. To facilitate the efficient layering of PV modules and recovery of valuable materials, this study proposes a PV module degradation and recycling process utilizing supercritical n-butanol. A systematic evaluation was conducted to assess the effects of various factors on the dissolution ratio of PV modules, with an appropriate range of process parameters selected for optimization. A second-order regression model was developed to predict the dissolution ratio of the EVA film. Comparison of actual dissolution ratio with model predictions confirmed the high accuracy of the fitted model. Finally, characterization and elemental analysis of cells recovered from the supercritical process demonstrated the effectiveness of this recycling method, achieving more thorough degradation on the cell surfaces.

关键词： Photovoltaic Supercritical n-butanol Degradation Recycling Characterization

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新冠病毒抗原/抗体检测闭环管控体系构建

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中国药业 2023年第6期32卷 7-10页

作者：温天文巫军袁学军肖大伟刁勇张旭雯江苏科兴诺生物技术有限公司江苏泰州225300 南京为绿生物科技有限公司江苏南京210032 南京鼓楼医院集团高新医院医学临床中心江苏南京210032 华侨大学医学院福建泉州362021

目的构建科学、合理、有效、可行的新型冠状病毒(简称新冠病毒)抗原/抗体检测全过程闭环管控体系。方法对比核酸检测与抗原/抗体检测的特点,结合新冠病毒特性及当前国家疫情防控实际,探讨构建体系的具体举措。结果通过在抗原/抗体检测... 详细信息

目的构建科学、合理、有效、可行的新型冠状病毒(简称新冠病毒)抗原/抗体检测全过程闭环管控体系。方法对比核酸检测与抗原/抗体检测的特点,结合新冠病毒特性及当前国家疫情防控实际,探讨构建体系的具体举措。结果通过在抗原/抗体检测产品的生产、流通、使用、报告、回收处理及跟踪溯源、数据管理等环节开展管控,可形成以产品唯一识别码(UDI)为基础的抗原/抗体检测全过程闭环管控体系。结论构建的闭环管控体系可分区、分类逐步推广实施,以更科学、合理地实现新冠病毒抗原/抗体检测的安全性、真实性、可行性、可控性。

关键词：新型冠状病毒抗原/抗体检测唯一识别码闭环管控药品监管

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Explicit Solutions to the n-dimensional Semi-stationary Compressible Stokes Problem

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INTERNATIONAL JOURNAL OF THEORETICAL PHYSICS 2025年第2期64卷 1-11页

作者： zhang, Lijun Zhao, Qiong Huo, xuwen Khalique, Chaudry Masood Zhejiang Univ Sci & Technol Hangzhou 310023 Zhejiang Peoples R China Shandong Univ Sci & Technol Coll Math & Syst Sci Qingdao 266590 Shandong Peoples R China Zhejiang Scitech Univ Hangzhou Sch Comp Sci & Technol Zhejiang 3100018 Peoples R China North West Univ Fac Nat & Agr Sci Mat Sci Innovat & Modelling Res Focus Area Mafikeng Campus ZA-2735 Mmabatho South Africa

The n-dimensional semi-stationary compressible Stokes equations, established to model the dynamics of vortices in the Ginzburg-Landau theories in superconductivity, is a simplification of the isentropic compressible Navier-Stokes equations. This model equation can also be derived from the equations for the flows in compressible porous media in petroleum engineering or in compressible tissues. In this work, we investigate the n-dimensional semi-stationary compressible Stokes equations and obtain a family of explicit solutions in which the density does not change with space variables but decays to zero with time increasing exponentially, while the velocity is a quadratic polynomial of the space variables. It is worth pointing out that our results not only include the known results for n=2\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$n=2$$\end{document} and n=3\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$n=3$$\end{document} in Xue and Dong (Int. J. Theor. Phys. 63(6), 151 (2024)), but also present the explicit solutions to the semi-stationary compressible Stokes equations in arbitrary higher dimensional space.

关键词： Compressible fluids Semi-stationary compressible Stokes problem Explicit solutions

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The marine environmental microbiome mediates physiological outcomes in host nematodes

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BMC BIOLOGY 2024年第1期22卷 1页

作者： Xue, Yiming Xie, Yusu Cao, xuwen zhang, Liusuo Chinese Acad Sci Inst Oceanol CAS Qingdao 266071 Peoples R China Chinese Acad Sci Inst Oceanol Shandong Prov Key Lab Expt Marine Biol Qingdao 266071 Peoples R China Qingdao Natl Lab Marine Sci & Technol Lab Marine Biol & Biotechnol Qingdao 266237 Peoples R China Chinese Acad Sci Ctr Ocean Mega Sci 7 Nanhai Rd Qingdao 266071 Peoples R China Univ Chinese Acad Sci Beijing 100049 Peoples R China

Background Nematodes are the most abundant metazoans in marine sediments, many of which are bacterivores;however, how habitat bacteria affect physiological outcomes in marine nematodes remains largely unknown. Results Here, we used a Litoditis marina inbred line to assess how native bacteria modulate host nematode physiology. We characterized seasonal dynamic bacterial compositions in L. marina habitats and examined the impacts of 448 habitat bacteria isolates on L. marina development, then focused on HQbiome with 73 native bacteria, of which we generated 72 whole genomes sequences. Unexpectedly, we found that the effects of marine native bacteria on the development of L. marina and its terrestrial relative Caenorhabditis elegans were significantly positively correlated. Next, we reconstructed bacterial metabolic networks and identified several bacterial metabolic pathways positively correlated with L. marina development (e.g., ubiquinol and heme b biosynthesis), while pyridoxal 5'-phosphate biosynthesis pathway was negatively associated. Through single metabolite supplementation, we verified CoQ10, heme b, acetyl-CoA, and acetaldehyde promoted L. marina development, while vitamin B6 attenuated growth. Notably, we found that only four development correlated metabolic pathways were shared between L. marina and C. elegans. Furthermore, we identified two bacterial metabolic pathways correlated with L. marina lifespan, while a distinct one in C. elegans. Strikingly, we found that glycerol supplementation significantly extended L. marina but not C. elegans longevity. Moreover, we comparatively demonstrated the distinct gut microbiota characteristics and their effects on L. marina and C. elegans physiology. Conclusions Given that both bacteria and marine nematodes are dominant taxa in sedimentary ecosystems, the resource presented here will provide novel insights to identify mechanisms underpinning how habitat bacteria affect nematode biology in a more natural context. Ou

关键词： Litoditis marina Full-length 16S rRNA sequencing Marine bacterial collection Host-microbe interactions Metabolic models Gene knockout Gut microbiota

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Engineering of Charge-Transfer State to Modify Photophysical Properties in N,N′-Diaryl-dihydrodibenzo[a,c]phenazine

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JOURNAL OF PHYSICAL CHEMISTRY C 2024年第36期128卷 15124-15131页

作者： Sun, xuwen Cong, Muyu Jin, Xin Su, Jianhua zhang, Zhiyun East China Univ Sci & Technol Feringa Nobel Prize Scientist Ctr Materiobiol & Dy Key Lab Adv Mat Shanghai 200237 Peoples R China East China Univ Sci & Technol Feringa Nobel Prize Scientist Ctr Materiobiol & Dy Joint Int Res Lab Precis Chem & Mol Engn Shanghai 200237 Peoples R China

Herein, we explored the charge transfer (CT) effect on the excited-state structural and electronic evolution of N,N '-diphenyl-dihydrodibenzo[a,c]phenazine (DPAC) featuring various electron-donating groups (EDGs). Upon photoexcitation, DPAC molecules undergo a sequential multistep structural transformation along the Franck-Condon (FC) state, CT-controlled bent state (responsible for E1 & horbar;420 nm), and twisted state (responsible for E2 & horbar;600 nm). By introducing different EDGs to the DPAC core, we can fine-tune the balance between the inherent decay of the CT-controlled bent state and its progression into the twisted state by adjusting the CT effect. As the electron-donating ability of the EDG increases, the strong CT effect can produce a "deep" (stable) CT-controlled bent state, in which the transformation of the excited molecular skeleton from bent into twisted was partly suppressed. This research provides valuable insights into organic chromophores' excited-state structural and electronic evolution, revealing how competitive decay pathways are contingent upon the CT effect.

关键词： Charge transfer

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Microstructure, mechanical and neutron shielding properties of aluminum borate ceramics obtained from alumina and boric acid

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JOURNAL OF THE AUSTRALIAN CERAMIC SOCIETY 2024年第3期60卷 905-915页

作者： Lao, Dong zhang, Yan Huang, Lingfeng Liang, xuwen Jia, Wenbao Nanjing Univ Aeronaut & Astronaut NUAA Dept Nucl Sci & Technol Nanjing 211106 Peoples R China East China Univ Technol Engn Res Ctr Nucl Technol Applicat Minist Educ Nanchang 330013 Peoples R China Jiangsu Higher Educ Inst Collaborat Innovat Ctr Radiat Med Suzhou 215006 Peoples R China

In this study, a series of aluminum borate ceramics (ABCs) with needle-like whiskers were obtained using a low-cost, solid-state, pressureless sintering ceramic route, without any additives during the preparation process. The effects of different alumina/boric acid molar ratios and sintering temperatures on the phase composition, microstructure, mechanical properties, specific surface area, pore size distribution, and sub-cadmium neutron shielding properties of ABCs were studied using orthogonal experiments. It was observed that pure phase aluminum borate (Al18B4O33) ceramics could be obtained at 1100 degree celsius, forming a mass of needle-like whiskers. The whiskers' aspect ratio, fracture work, specific surface area, and pore size distribution of ABCs are maximized when ABCs are sintered at 1100 degree celsius with 9:6 alumina/boric acid molar ratio. In this condition, ABCs (0.5 cm) can shield 70% of sub-cadmium neutrons (E<0.4 eV). These findings demonstrate the great potential of aluminum borate ceramics for neutron shielding applications.

关键词： Aluminum borates ceramics (ABCs) Solid-state reaction synthesis Al18B4O33 whiskers Mechanical properties Sub-cadmium neutron shielding capacity

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