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Emerging R&D on membranes and systems for water reuse and desalination

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Chinese Journal of Chemical Engineering 2019年第7期27卷 1578-1585页

作者： Tai-Shung Chung Dieling Zhao Jie Gao Kangjia Lu chunfeng wan Martin Weber Christian Maletzko Department of Chemical and Biomolecular Engineering National University of SingaporeSingapore 117585Singapore Advanced Materials and Systems Research BASF SERAP/OUB - B167056 LudwigshafenGermany Performance Materials BASF SEG-PMFSU-F20667056 LudwigshafenGermany

Sustainable production of clean water is a global challenge.While we firmly believe that membrane technologies are one of the most promising solutions to tackle the global water challenges,one must reduce their energy consumption and fouling propensity for broad sustainable applications.In addition,different membranes face various challenges in their specific applications during long-term operations.In this short review,we will summarize the recent progresses in emerging membrane technologies and system integration to advance and sustain water reuse and desalination with discussion on their challenges and perspectives.

关键词： Membrane technology Water reuse Desalination Hybrid system Nanomaterials

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新生儿胃穿孔预后的多因素分析

中华小儿外科杂志 2024年第5期45卷 402-407页

作者：万成亮白强张传勃方辉黄纯锋郑陈军海波昆明市儿童医院昆明医科大学附属儿童医院普通外科昆明650018

目的探讨影响新生儿胃穿孔的预后相关因素。方法收集2010年1月至2022年1月昆明医科大学附属儿童医院收治的115例新生儿胃穿孔患儿的临床资料,其中男76例,女39例;足月儿41例,早产儿74例;平均体重为2.37 kg,体重范围是1.15~3.85 kg;发病... 详细信息

目的探讨影响新生儿胃穿孔的预后相关因素。方法收集2010年1月至2022年1月昆明医科大学附属儿童医院收治的115例新生儿胃穿孔患儿的临床资料,其中男76例,女39例;足月儿41例,早产儿74例;平均体重为2.37 kg,体重范围是1.15~3.85 kg;发病时平均日龄为3.25 d,日龄范围是1.23~7.55 d,其中发病日龄1~3 d的有88例;胃壁肌层缺损109例,胃壁炎症、坏死穿孔6例。根据患儿是否存活,将其分为生存组与死亡组,其中生存组85例,死亡组30例,比较可能影响新生儿胃穿孔预后的部分临床因素、手术因素及病理因素;对生存组患儿进行随访,了解其生存情况。结果生存组与死亡组两组患儿间性别、是否早产、是否合并其他消化道畸形、是否存在胃壁肌层缺损、是否存在凝血功能异常、是否存在电解质紊乱、术前降钙素值、术前血清白蛋白值、术前血红蛋白值、穿孔最大径、手术时间及术中出血量的差异均无统计学意义(P>0.05),两组间术前乳酸值、是否低出生体重及发现临床症状到就诊时间的差异有统计学意义(P<0.05);将术前乳酸值、是否低出生体重及发现临床症状到就诊时间纳入多因素logistic回归分析中得出影响新生儿胃穿孔预后的独立因素为发现临床症状到就诊时间(P<0.05)。随访结果显示,生存组85例患儿中有2例术后出现粘连性肠梗阻,1例行肠粘连松解手术治疗,1例经保守治疗后缓解,所有患儿生长发育正常,营养状况良好;新生儿胃穿孔死亡30例,死亡率高达26.1%(30/115)。结论发病到就诊的时间是影响新生儿胃穿孔最重要的预后因素,故及时就诊治疗是患儿获得生存的关键。

关键词：婴儿,新生胃穿孔预后多因素分析

Synthesis and property characterization of ternary laminar Zr_(2)SB ceramic

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Journal of Advanced Ceramics 2022年第5期11卷 825-833页

作者： Qiqiang ZHANG Shuai FU Detian wan Yiwang BAO Qingguo FENG Salvatore GRASSO chunfeng HU Key Laboratory of Advanced Technologies of Materials Ministry of EducationSchool of Materials Science and EngineeringSouthwest Jiaotong UniversityChengdu 610031China State Key Laboratory of Green Building Materials China Building Materials AcademyBeijing 10000China

In this paper,Zr_(2)SB ceramic with purity of 82.95 wt%(containing 8.96 wt%ZrB_(2)and 8.09 wt%zirconium)and high relative density(99.03%)was successfully synthesized from ZrH_(2),sublimated sulfur,and boron powders by spark plasma sintering(SPS)at 1300℃.The reaction process,microstructure,and physical and mechanical properties of Zr_(2)SB ceramic were systematically studied.The results show that the optimum molar ratio to synthesize Zr_(2)SB is n(ZrH_(2)):n(S):n(B)=1.4:1.6:0.7.The average grain size of Zr_(2)SB is 12.46μm in length and 5.12μm in width,and the mean grain sizes of ZrB2 and zirconium impurities are about 300 nm.In terms of physical properties,the measured thermal expansion coefficient(TEC)is 7.64×10^(-6) K^(-1) from room temperature to 1200℃,and the thermal capacity and thermal conductivity at room temperature are 0.39 J·g^(-1)·K^(-1)and 12.01 W·m^(-1)·K^(-1),respectively.The room temperature electrical conductivity of Zr_(2)SB ceramic is measured to be 1.74×10^(6)Ω^(-1)·m^(-1).In terms of mechanical properties,Vickers hardness is 9.86±0.63 GPa under 200 N load,and the measured flexural strength,fracture toughness,and compressive strength are 269±12.7 MPa,3.94±0.63 MPa·m1/2,and 2166.74±291.34 MPa,respectively.

关键词： Zr_(2)SB spark plasma sintering(SPS) reaction path microstructure properties

Hot forging Nb_(4)AlC_(3)ceramics with enhanced properties

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Journal of Advanced Ceramics 2023年第11期12卷 2032-2040页

作者： Ye Yu Shuai Fu Detian wan Yiwang Bao Longsheng Chu Qingguo Feng chunfeng Hu Key Laboratory of Advanced Technologies of Materials Ministry of EducationSchool of Materials Science and EngineeringSouthwest Jiaotong UniversityChengdu 610031China State Key Laboratory of Green Building Materials China Building Materials AcademyBeijing 100024China

Textured Nb_(4)AlC_(3)ceramics were rapidly and efficiently prepared by hot forging through spark plasma sintering(SPS).The longitudinal compression ratio of textured Nb_(4)AlC_(3)ceramics was−78.3%,and the lateral expansion ratio was 32.1%.The grains grew preferentially along the direction perpendicular to the c-axis,forming the texture microstructure.The Lotgering orientation factor f(00l)was calculated to be 0.63.The thermal conductivity of textured Nb_(4)AlC_(3)ceramics along the c-axis direction(11.23 W·m^(−1)·K^(−1))(25℃)was lower than that of untextured ceramics(13.75 W·m^(−1)·K^(−1))(25℃).The electrical conductivity perpendicular to the c-axis direction reached 4.37×10^(6) S·m^(−1)at room temperature.The ordered layered grains increased the resistance of crack propagation,resulting in a higher fracture toughness parallel to the c-axis direction(9.41 MPa·m^(1/2)),which was higher than that of untextured ceramics(6.88 MPa·m1/2).The Vickers hardness tested at 10 N on the texture top surface(7.18 GPa)was higher than that on the texture side surface(6.45 GPa).

关键词： Nb_(4)AlC_(3) texture anisotropy microstructure properties

Effect of potential difference between nano-Al_(2)O_(3)whisker and Mg matrix on the dispersion of Mg composites

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International Journal of Minerals,Metallurgy and Materials 2023年第1期30卷 104-111页

作者： Xiaoying Qian Hong Yang chunfeng Hu Ying Zeng Yuanding Huang Xin Shang Yangjie wan Bin Jiang Qingguo Feng National Engineering Research Center for Magnesium Alloys Chongqing UniversityChongqing 400044China College of Materials Science and Engineering Chongqing UniversityChongqing 400044China Key Laboratory of Advanced Technologies of Materials Ministry of EducationSchool of Material Science and EngineeringSouthwest Jiaotong UniversityChengdu 610031China Institute of Metallic Biomaterials Helmholtz-Zentrum HereonMax-Planck-Str.1D-21502 GeesthachtGermany School of Mechanical Engineering Dongguan University of TechnologyDongguan 523808China

The potential difference between positive and negative ions was utilized to improve the homogenized dispersion of nanoscale Al_(2)O_(3) whiskers in Mg matrix composites.The Mg powders were decorated with sodium dodecylbenzene sulfonate(C_(18)H_(29)NaO_(3)S,SDBS)and were introduced to the cathode group on their surface.The Al_(2)O_(3) whiskers were modified by the cetyl trimethyl ammonium bromide(C_(19)H_(42)BrN,CTAB)and were featured in the anode group.The suitable contents of CTAB and SDBS,the application atmosphere,and the type of solvents were investigated.Dispersion results showed that adding 2wt%SDBS into Mg powders and adding 2wt%CTAB into Al_(2)O_(3) whiskers pro-moted the formation of more uniformly mixed composite powders,compared to those of conventional ball milling via scanning electron micro-scopy(SEM)analysis.Meanwhile,the calculated results derived from first-principle calculations also demonstrated the stronger cohesion between Al_(2)O_(3) whisker reinforcements and Mg matrix than undecorated composite powders.After preparation by powder metallurgy,the mor-phology,grain size,hardness,and standard deviation coefficient of composites were analyzed to evaluate the dispersed efficiency.The results indicated that the modification of homogenized dispersed Al_(2)O_(3) whiskers in composites contributed to the refinement of 26%in grain size and the improvement of 20%in hardness compared with pure Mg,and the reduction of 32.5%in the standard deviation coefficient of hardness compared with the ball-milling sample.

关键词： magnesium-based composites Al_(2)O_(3)whiskers potential difference dispersion

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一种针对全自动运行系统的测试用例生成方法

铁路通信信号工程技术 2024年第1期21卷 76-82页

作者：梁君海李春峰万里杨毅峰薛一鸣中车成都机车车辆有限公司西南研发中心成都610511 西南交通大学信息科学与技术学院成都610097

针对全自动运行系统测试指定路径覆盖的测试需求,基于时间自动机建模理论提出满足指定路径覆盖和边覆盖的全自动运行系统测试用例自动生成算法。研究时间自动机建模理论,建立全自动运行系统的时间自动机模型;为表征全自动运行系统指定... 详细信息

针对全自动运行系统测试指定路径覆盖的测试需求,基于时间自动机建模理论提出满足指定路径覆盖和边覆盖的全自动运行系统测试用例自动生成算法。研究时间自动机建模理论,建立全自动运行系统的时间自动机模型;为表征全自动运行系统指定路径覆盖的测试需求,提出基于时间自动机模型的标记变量建模方法;结合Yggdrasil的测试用例生成机制,提出全自动运行系统测试用例生成方法,同时满足全自动运行系统测试的指定路径覆盖和边覆盖准则;以全自动运行系统的模式转换功能为例,建立时间自动机模型并生成测试用例。结果表明,测试用例100%覆盖测试人员指定的测试需求和时间自动机模型所有的边,能够满足全自动运行系统指定路径覆盖的测试要求。

关键词：全自动运行系统指定路径覆盖时间自动机 Yggdrasil 测试用例

基于改进Jaya算法和组合相关函数的结构损伤识别

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振动与冲击 2023年第20期42卷 300-308页

作者：张广才赵文龙万春风东南大学混凝土及预应力混凝土结构教育部重点实验室南京211189

针对Jaya算法计算精度差、收敛速度慢、易陷入局部最优而提前收敛等问题,为提高算法的性能,引入Hammersley序列初始化、Lévy飞行搜索、经验学习策略得到改进Jaya算法。计算加速度响应互相关函数的所有组合,得到组合相关函数,在此基础... 详细信息

针对Jaya算法计算精度差、收敛速度慢、易陷入局部最优而提前收敛等问题,为提高算法的性能,引入Hammersley序列初始化、Lévy飞行搜索、经验学习策略得到改进Jaya算法。计算加速度响应互相关函数的所有组合,得到组合相关函数,在此基础上提出基于改进Jaya算法和组合相关函数的结构损伤识别方法。利用随机激励下多自由度体系模型验证该识别方法的有效性,并讨论不同的优化算法、噪声等级、采样频率、采样时间、数据点数、传感器数量、模型误差等因素对识别结果的影响。研究结果表明:与遗传算法和Jaya算法相比,改进Jaya算法可以更好地平衡全局搜索和局部搜索,加快收敛速度,提高识别精度;改进Jaya算法和组合相关函数的损伤识别方法在20%噪声下仍然可以准确识别结构刚度损伤位置和程度。

关键词：结构损伤识别 Jaya算法组合相关函数 Hammersley序列 Lévy飞行经验学习

The Colourful Glazed Forbidden City

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China & The World Cultural Exchange 2004年第6期70卷 10-12页

作者： Yang chunfeng and wan Yi

Colored glaze is a building material that is more solid than timber and more stunning than stone. Its bright and glistening luster gives both form and face to the architecture.

关键词：中国紫禁城建筑风格城市规划

Effects of sleep fragmentation on white matter pathology in a rat model of cerebral small vessel disease

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Effects of sleep fragmentation on white matter pathology in ...