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Improving chitosan-based composite membrane by introducing a novel hybrid functional nano-hydroxyapatite with carboxymethyl cellulose and phytic acid

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Frontiers of Chemical Science and Engineering 2024年第6期18卷 1-15页

作者： Liuyun Jiang yingjun ma Shuo Tang Yuqing Wang Yan Zhang Shengpei Su Xiang Hu Jun He National&Local Joint Engineering Laboratory for New Petro-chemical materials and Fine Utilization of Resources Key Laboratory of Chemical Biology&Traditional Chinese Medicine Research(Ministry of Education)College of Chemistry and Chemical EngineeringHunan Normal UniversityChangsha 410081China State Key Laboratory Developmental Biology of Freshwater Fish School of Life ScienceHunan Normal UniversityChangsha 410081China Hunan Provincial Key Laboratory of Regional Hereditary Birth Defects Prevention and Control Changsha Hospital for Matemal&Child Health Care Aiffiliated to Hunan Normal UniversityChangsha 410081China

A functional hybrid nano-hydroxyapatite(carboxymethyl cellulose-phytic acid-n-HA,CMC-PA-n-HA)was prepared by adding CMC and *** results of Fourier transformation infrared spectra,X-ray diffraction,thermal gravimetric analysis and dispersion experiments indicated that the addition of CMC and PA affected the morphology,crystallinity and crystal size of hybrid n-HA,and CMC endowed hybrid n-HA with excellent *** electron microscope results showed that CMC-PA-n-HA nanoparticle could be uniformly dispersed in chitosan(CS)matrix to obtain composite membrane by casting technology,so that the highest tensile strength of CMC-PA-n-HA/CS composite membrane was 69.64%and 144.45%higher than that of CS membrane and n-HA/CS composite membrane,*** angle test showed that CMC-PA-n-HA effectively improved hydrophilicity of the CS *** simulated body fluid immersion results indicated that the CMC-PA-n-HA/CS composite membrane not only exhibited good degradability but also promoted bone-like apatite *** cell proliferation experiments proved that the introduction of PA made the composite membrane have better cell adhesion and proliferation *** tests demonstrated that PA could effectively improve the antibacterial properties of the composite membrane,which is expected to be applied as guide bone tissue regeneration membrane.

关键词： nano-hydroxyapatite chitosan dispersion guide bone tissue regeneration membrane

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脑积水性脑室-腹腔分流术后护理质量评价指标体系的构建及应用

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循证护理 2024年第11期10卷 1964-1969页

作者：张咏倩马颖君尹庆南京医科大学附属无锡人民医院江苏214000

目的:构建脑积水性脑室-腹腔分流术后护理质量评价指标体系,并经临床应用研究其临床效果。方法:通过德尔菲法专家函询法筛选、修订,最终构建完整的脑积水性脑室-腹腔分流术后护理质量评价指标体系。采用便利抽签法选取我院2021年1月—1... 详细信息

目的:构建脑积水性脑室-腹腔分流术后护理质量评价指标体系,并经临床应用研究其临床效果。方法:通过德尔菲法专家函询法筛选、修订,最终构建完整的脑积水性脑室-腹腔分流术后护理质量评价指标体系。采用便利抽签法选取我院2021年1月—12月和2022年1月—12月收治的脑积水性脑室-腹腔分流术病人,采用随机数字表法分为对照组和观察组,各55例。从2022年1月1日开始应用该方案,在此之前采用常规护理模式。比较两组在康复指标(活动能力、神经功能)、术后并发症及生活质量方面的差异。结果:本研究专家两轮函询问卷有效回收率均为100%;专家权威系数为0.881和0.909。肯德尔和谐系数(Kendall′s W)为0.357(P<0.001),第2轮Kendall′s W值为0.427(P<0.001),专家意见趋于一致。本研究构建的脑积水性脑室-腹腔分流术后护理质量评价指标体系包括3个一级指标、7个二级指标、23个三级指标。指标变异系数为0.05~0.13,可靠性较高。应用研究结果显示,观察组病人活动能力、神经功能指标优于对照组(均P<0.05),观察组术后并发症发生率低于对照组,差异有统计学意义(均P<0.05),且观察组生活质量评分优于对照组,差异有统计学意义(均P<0.05)。结论:脑积水性脑室-腹腔分流术后护理质量评价指标体系的构建和应用有效规范病人围术期护理流程,促进病人术后康复,降低术后并发症,提高病人生活质量。

关键词：脑积水性脑室-腹腔分流术护理质量评价指标体系术后康复生活质量

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低成本小型化遥感光学系统设计

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应用光学 2024年第4期45卷 693-699页

作者：郭欣瑜周顺梅超闫阿奇马迎军齐自淼武银子西安工业大学光电工程学院陕西西安710021 中国科学院西安光学精密机械研究所陕西西安710119 西安市飞行器光学成像与测量技术重点实验室陕西西安710119

随着航空航天成像技术的发展,遥感成像观测系统需求不断增加,为了简化光学系统的加工装配复杂度,缩小光学系统体积,该文提出了一种低成本、小型化遥感成像光学系统设计方法。在全球面镜的基础上,配合氟化钙等低色散材料,设计了一种焦距2... 详细信息

随着航空航天成像技术的发展,遥感成像观测系统需求不断增加,为了简化光学系统的加工装配复杂度,缩小光学系统体积,该文提出了一种低成本、小型化遥感成像光学系统设计方法。在全球面镜的基础上,配合氟化钙等低色散材料,设计了一种焦距2000 mm,适用于5.08 cm(2 inch)探测器的光学成像系统,该系统在50 lp/mm处MTF(调制传递函数)优于0.41,体积与R-C系统接近,系统的球面主、次镜避免了在加工装调时使用非球面补偿器,降低了加工装调成本。同时设计了新型百叶窗遮光罩结构,有效避免了传统外遮光罩结构形式体积过大的问题,规避角大于12°后PST(点源透射比)值均小于10^(-6),且光学体积仅为ф227×421 mm^(3),远小于传统外遮光罩形式。该系统具有低成本、结构小型化、轻量化、像质优良、杂散光抑制良好等优点,在工程应用中可以满足航空航天成像系统的使用要求。

关键词：光学设计遥感光学成像系统可见光长焦距小型化

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Trace element geochemistry during chemical weathering——As exemplified by the weathered crust of granite, Longnan, Jiangxi

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Chinese Science Bulletin 1999年第24期44卷 2260-2263页

作者： yingjun ma Congqiang Liu Chinese Acad Sci Inst Geochem State Key Lab Environm Geochem Guiyang 550002 Peoples R China

The granite weathering in Longnan, Jiangxi, is represented by mineralogical changes of feldspars · montmorillonite, illite · kaolinite, halloysite · bauxite, with Na, Ca, Si, P, V, U and Sr being in a mobile state while Ti, Al, Fe, Sc, Th, Zr and Hf remaining relatively conservative. With the exception of Zr/Hf, Nb/Ta, Th/Sc, Zr/Nd and Sm/Nb, changes are notable in ratios between most of the trace elements. Re-distribution of REE and Y has

关键词： granite weathering crust chemical weathering trace elements Longnan Jiangxi.

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Efficient Electromagnetic Wave Absorption and Thermal Infrared Stealth in PVTMS@MWCNT Nano‑Aerogel via Abundant Nano‑Sized Cavities and Attenuation Interfaces

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Nano-Micro Letters 2024年第1期16卷 370-383页

作者： Haoyu ma maryam Fashandi Zeineb Ben Rejeb Xin Ming yingjun Liu Pengjian Gong Guangxian Li Chul B.Park College of Polymer Science and Engineering State Key Laboratory of Polymer Materials EngineeringSichuan University24 Yihuan RoadNanyiduanChengdu 610065SichuanPeople’s Republic of China Microcellular Plastics manufacturing Laboratory Department of Mechanical and Industrial EngineeringUniversity of Toronto5 King’s College RoadTorontoON M5S 3G8Canada Jiangsu JITRI Advanced Polymer materials Research Institute Tengfei Building88 Jiangmiao RoadJiangbei New DistrictNanjing 211800JiangsuPeople’s Republic of China MOE Key Laboratory of macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringInternational Research Center for X PolymersZhejiang University38 Zheda RoadHangzhou 310027People’s Republic of China

Pre-polymerized vinyl trimethoxy silane(PVTMS)@MWCNT nano-aerogel system was constructed via radical polymerization,sol-gel transition and supercritical CO_(2)*** fabricated organic-inorganic hybrid PVTMS@MWCNT aerogel structure shows nano-pore size(30-40 nm),high specific surface area(559 m^(2)g^(−1)),high void fraction(91.7%)and enhanced mechanical property:(1)the nano-pore size is beneficial for efficiently blocking thermal conduction and thermal convection via Knudsen effect(beneficial for infrared(IR)stealth);(2)the heterogeneous interface was beneficial for IR reflection(beneficial for IR stealth)and MWCNT polarization loss(beneficial for electromagnetic wave(EMW)attenuation);(3)the high void fraction was beneficial for enhancing thermal insulation(beneficial for IR stealth)and EMW impedance match(beneficial for EMW attenuation).Guided by the above theoretical design strategy,PVTMS@MWCNT nano-aerogel shows superior EMW absorption property(cover all Ku-band)and thermal IR stealth property(ΔT reached 60.7℃).Followed by a facial combination of the above nano-aerogel with graphene film of high electrical conductivity,an extremely high electromagnetic interference shielding material(66.5 dB,2.06 mm thickness)with superior absorption performance of an average absorption-to-reflection(A/R)coefficient ratio of 25.4 and a low reflection bandwidth of 4.1 GHz(A/R ratio more than 10)was experimentally obtained in this work.

关键词： Nano-pore size Heterogeneous interface Electromagnetic wave absorption Thermal infrared stealth Nano-aerogel

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Pd和Ru分别修饰Co_(3)O_(4)催化剂的制备及其高效氧催化性能研究

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稀有金属 2023年第12期47卷 1716-1725页

作者：马英军马传利徐金晓王琳龚良玉王杰青岛农业大学化学与药学院青岛266109

氧催化反应是决定燃料电池和金属-空气电池性能的重要组成部分,然而其反应的动力学滞后性严重制约着电池的发展。为改善氧催化性能,提出原位贵金属修饰策略,分别构筑了Pd修饰Co_(3)O_(4)(Pd-Co_(3)O_(4))和Ru修饰Co_(3)O_(4)(Ru-Co_(3)O... 详细信息

氧催化反应是决定燃料电池和金属-空气电池性能的重要组成部分,然而其反应的动力学滞后性严重制约着电池的发展。为改善氧催化性能,提出原位贵金属修饰策略,分别构筑了Pd修饰Co_(3)O_(4)(Pd-Co_(3)O_(4))和Ru修饰Co_(3)O_(4)(Ru-Co_(3)O_(4))催化剂。两种催化剂表现出独特的多孔结构,且实现了Pd/Ru纳米颗粒的高界面分散,有效提高了催化剂的传质和电化学活性面积,氧催化反应动力学得到了显著改善。此外,Pd-Co_(3)O_(4)的氧还原半波电位高达0.92 V,Ru-Co_(3)O_(4)在10 ma·cm^(-2)电流密度下的析氧电位低至1.55 V,表现出了优异的氧催化性能。基于Pd-Co_(3)O_(4)优异的氧还原催化性能和Ru-Co_(3)O_(4)优异的氧析出催化性能,将二者进行复合作为锌-空气电池(ZABs)氧电极的催化剂层。结果表明,复合催化剂组装的ZABs表现出了优异的电池性能,峰值功率密度高达118.5 mW·cm^(-2),优于Pt/C+RuO2复合催化剂。所报道的贵金属表面修饰策略为制备高贵金属利用率材料以及改善催化剂氧催化性能提供了新的思路方法。

关键词： Pd/Ru修饰Co_(3)O_(4) 氧还原反应氧析出反应锌-空气电池(ZABs)

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Trace elemental behavior during chemical weathering: A case study of biotite-granitic weathering profile in Longnan, Jiangxi Province, China

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Chinese Science Bulletin 1999年第S2期44卷 130-132页

作者： ma yingjun and LIU Congqiang State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China State Key Laboratory of Environmental Geochemistry Institute of Geochemistry Chinese Academy of Sciences Guiyang 550002 China

THE study of chemical weathering processes can provide significant insight into not only the behavior ofmigration, deposition and accumulation of REEs and other elements (e.g. Au, Fe, Al ), but also themechanism of material cycle on the surface of the earth, especially the relationship between detrital sediments and provenance. Lateritic profiles are widespread in southern China, where two kinds of valuable supergene deposit occur. One is "ion-adsorbed" REE ore deposit; the other is lateritic gold ore deposit. This study is to investigate the mobility and fractionation of major and trace elements and mineralogical variations during chemical weathering of biotite granite in Longnan, Jiangxi Province, China, andto provide significant data for a better understanding of the relationships between weathering of

关键词： chemical weathering trace elements rare earth element fractionation biotite-granite.

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Chemical weathering crust: A long-term storage of elements and its implications for sediment provenance

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Chinese Science Bulletin 1999年第S2期44卷 107-110页

RAKE earth element (REE) and other trace element distributions in fine grained detrital sediments are widely used to characterize source composition of sediments, but ambiguities remain concerning theresponse of sediment composition (e.g. REEs) to provenance characteristics. One of the argumentsis whether significant amounts of REEs and other trace elements are likely to be stored in weathering profiles on the continents. Another ambiguity is which trace element ratios can be transferred with minimal changes from bedrock to weathering profiles and then to sediments. In addition, the effects oferosion and chemical weathering on the compositions of sediments remain poorly documented A major A major goal of this research is to investigate which elements are likely to be stored in weatheringprofiles, and to evaluate the effects of in situ chemical weathering and erosion on the compositions of siliciclastic sediments.

关键词： weathering profiles rare earth elements trace elemental ratios sediment provenance erosion.

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物理学课程的线上教学案例分析

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电子技术（上海） 2022年第10期51卷 312-314页

作者：马英俊宁夏医科大学理学院宁夏750004

基于案例分析,阐述物理学课程的线上教学设计策略、教学实施、过程管控、评价机制。探讨物理学线上教学准备、线上教学设计与实施、质量监控、考核评价体系的构建,并对线上教学的有效性和效果进行分析。

关键词：物理学线上教学教学过程管控评价机制案例分析

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GEOCHEMISTRY OF ELEMENTS AS EVIDENCE FOR SEDIMENTATION-SUPERIMPOSITION FORMING AISHANG TUNGSTEN DEPOSIT IN JIANGXI PROVINCE

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Science in China,Ser.B 1985年第2期28卷 210-224页

作者：刘英俊马东升 Department of Geology Nanjing University

By the study of the trace elements in the Zishan formation of lower Carboniferons occurring in the Aishang mining area and its surroundings, the present paper proves that the Zishan formation is rich in B, Ti, Cu, etc., and contains the derivative tungsten-bearing layers related to local accumulation of the heavy minerals in genesis. The superimposition by the late granite has made the tungsten-bearing layers a strata-bound tungsten deposit. It has been concluded that the fundamental tungsten-bearing formation and the Zishan formation give tungsten and essential associated elements such as 13, Ti and Cu for forming the deposit, while the late granite supplies heat energy and superimposed composition such as Be and F.

关键词： GEOCHEMISTRY OF ELEMENTS AS EVIDENCE FOR SEDIMENTATION-SUPERIMPOSITION FORMING AISHANG TUNGSTEN DEPOSIT IN JIANGXI PROVINCE AS

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