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Synergistic regulation of temperature resistance and thermal insulation performance of zirconia-based ceramic fibers

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Rare Metals 2023年第12期42卷 4189-4200页

作者： Yong-Shuai Xie Ying Peng Zhe-Zhe Deng ze Zhu Yuan Cheng De-Hua Ma lu-Yi Zhu xing-Hong Zhang State Key Laboratory of Crystal Materials School of Crystal MaterialsShandong UniversityJinan 250100China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150001China

ZrO_(2) fiber is a promising high-temperature resistant and heat-insulating fiber ***,the decrease in mechanical properties caused by grain growth at high temperatures seriously affects its *** to achieve the synergy of its temperature resistance and the thermal insulation performance is still the focus of the current *** this work,we started with doping inequivalent elements and studied the phase composition,temperature resistance,and thermal insulation properties of Y_(2)O_(3)-ZrO_(2) ceramic fibers by adjusting the Y/Zr molar *** results showed that Y_(2)O_(3) could enter the crystal lattice of ZrO_(2) and form a solid *** the increase in Y_(2)O_(3) content,the structure of fibers changed from a tetragonal phase to a cubic phase,and the configurational entropy of the system *** larger configuration entropy in the sample could produce a robust steric hindrance effect,inhibiting grain *** heat treatment at 1300℃,the grain size of Y_(2)Zr_(2)O_(7)(Y5Z5)fibers was only 61.8%that of Y_(0.1)Zr_(0.9)O_(1.95)(Y1Z9)*** smaller grain size made the Y5Z5 fibers still have excellent flexibility and deformation recovery performance after heat treatment at 1300℃and could still return to the original state after 85%compression or folded in *** addition,due to the larger configurational entropy,the mean free path of phonon scattering was shortened,thereby improving the thermal insulation performance of the *** short,this work achieves the synergistic effect of temperature resistance and thermal insulation properties of zirconia-based fiber materials only through simple inequivalent element doping.

关键词： Ceramics fiber ZrO_(2) Y_(2)O_(3) Thermal insulation Temperature resistance

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由Chvátal定理引出的关于一些无穷可分分布的概率函数的下确界

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数学杂志 2024年第4期44卷 309-316页

作者：胡泽春陆鹏周倩倩周兴旺四川大学数学学院四川成都610065 南京邮电大学理学院江苏南京210023

受Chvátal定理的启发,本文研究了概率P(X≤κE[X])的下确界,其中κ是一个正实数, X是一个随机变量.利用分析的方法,我们得到了当随机变量的分布属于无穷可分分布,包括逆高斯分布,对数正态分布, Gumble分布和Logistic分布,时该随机变量... 详细信息

受Chvátal定理的启发,本文研究了概率P(X≤κE[X])的下确界,其中κ是一个正实数, X是一个随机变量.利用分析的方法,我们得到了当随机变量的分布属于无穷可分分布,包括逆高斯分布,对数正态分布, Gumble分布和Logistic分布,时该随机变量不超过其期望的概率的下确界.

关键词： Chvátal定理无穷可分分布逆高斯分布对数正态分布 Gumbel分布 Logistic分布

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TAZ and myostatin involved in muscle atrophy of congenital neurogenic clubfoot

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World Journal of Clinical Cases 2019年第16期7卷 2238-2246页

作者： Jia-xing Sun ze-Yu Yang Li-Mei Xie Bing Wang Ning Bai Ai-lu Cai Department of Ultrasound Shengjing Hospital of China Medical UniversityShenyang 110004Liaoning ProvinceChina Key Laboratory of Medical Cell Biology Ministry of EducationInstitute of Translational MedicineChina Medical UniversityLiaoning Province Collaborative Innovation Center of Aging Related Disease Diagnosis and Treatment and PreventionShenyang 110004Liaoning ProvinceChina

BACKGROUND Muscular atrophy is the basic defect of neurogenic *** atrophy of clubfoot needs more scientific and reasonable imaging measurement parameters to *** Hippo pathway and myostatin pathway may be directly correlated in *** this study,we will use congenital neurogenic clubfoot muscle atrophy model to verify in ***,the antagonistic mechanism of TAZ on myostatin was studied in the C2C12 cell differentiation *** To identify muscle atrophy in fetal neurogenic clubfoot by ultrasound imaging and detect the expression of TAZ and myostatin in gastrocnemius *** elucidate the possible mechanisms by which TAZ antagonizes myostatin-induced atrophy in an in vitro cell *** Muscle atrophy in eight cases of fetal unilateral clubfoot with nervous system abnormalities was identified by 2D and 3D *** blotting and immunostaining were performed to detect expression of myostatin and *** overexpression in C2C12 myotubes and the expression of associated proteins were analyzed by western *** The maximum cross-sectional area of the fetal clubfoot on the varus side was reduced compared to the contralateral *** was elevated in the atrophied gastrocnemius muscle,while TAZ expression was *** were negatively *** overexpression reversed the diameter reduction of the myotube,downregulated phosphorylated Akt,and increased the expression of forkhead box O4 induced by *** Ultrasound can detect muscle atrophy of fetal *** and myostatin are involved in the pathological process of neurogenic clubfoot muscle *** antagonizes myostatin-induced myotube atrophy,potentially through regulation of the Akt/forkhead box O4 signaling pathway.

关键词： Congenital clubfoot Neurogenic Muscle atrophy Myostatin TAZ

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Two New Diterpenoids from Isodon lungshengensis

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Chinese Chemical Letters 1997年第12期8卷 0-0页

作者： Bei JIANG xing Rong CHEN ze Qin lu Zhong Wen LIN and Han Dong SUN(Laboratory of Pbytochemistry, Kunming Institute of Botany, Academia Sinica Kunming 650204)( W of Pharmacy Dali Medical College, Dali, Yunnan 671000)(Department of Chemistry and Chemical I Laboratory of Phytochemistry Kunming Institute of Botany Academia Sinica Kunming 650204 China Department of Chemistry Guangxi Normal University Guilin 541004 China Department of Pharmacy Dali Medical College Dali Yunnan 671000 China

Two new diterpenoids, lungshengenin B and C (1-2), were isolated from Isodon lungshengensis. The structures were determined as 1α-2β,3β,11β,15β-tetraacetoxy ent-kaur-16-en-6-one, 11α-hydroxy-2β, 3β, 6α-triace... 详细信息

关键词： EIMS Two New Diterpenoids from Isodon lungshengensis

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鞘管保护下硬质胆道镜经腹腔镜胆总管入路治疗肝内外胆管结石的临床价值

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微创医学 2024年第2期19卷 128-133页

作者：陆涛黄荣德张洪昌孙兴裴恒照苏泽方兆山广西中医药大学附属瑞康医院肝胆外科广西南宁市530011 广西医科大学第五附属医院肝胆外科广西南宁市530022

目的探讨鞘管保护下硬质胆道镜(硬镜)经腹腔镜胆总管入路治疗肝内胆管结石和胆总管结石的临床价值。方法选取115例肝内外胆管结石患者作为研究对象。根据手术方法将患者分为硬镜组58例、软镜组57例,硬镜组采用鞘管保护下硬质胆道镜经腹... 详细信息

目的探讨鞘管保护下硬质胆道镜(硬镜)经腹腔镜胆总管入路治疗肝内胆管结石和胆总管结石的临床价值。方法选取115例肝内外胆管结石患者作为研究对象。根据手术方法将患者分为硬镜组58例、软镜组57例,硬镜组采用鞘管保护下硬质胆道镜经腹腔镜胆总管入路取石治疗,软镜组采用纤维胆道镜经腹腔镜胆总管入路取石治疗。比较两组患者的手术时间、术中出血量、术后住院时间、结石清除率,以及术后第1天肝功能(空腹静脉血总胆红素、直接胆红素、碱性磷酸酶、γ-谷氨酰转移酶水平)、术后并发症发生情况等。结果硬镜组患者的手术时间短于软镜组,结石清除率高于软镜组,差异均有统计学意义(均P0.05)。结论鞘管保护下硬质胆道镜经腹腔镜胆总管入路治疗肝内胆管结石和胆总管结石的手术时间短、结石清除率高,是一种安全、高效的手术策略,具有一定的潜在应用价值。

关键词：肝内胆管结石胆总管结石硬质胆道镜纤维胆道镜腹腔镜胆总管探查术

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Repair of a common bile duct defect with a decellularized ureteral graft

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World Journal of Gastroenterology 2016年第48期22卷 10575-10583页

作者： Yao Cheng Xian-ze Xiong Rong-xing Zhou Yi-Lei Deng Yan-Wen Jin Jiong lu Fu-Yu Li Nan-Sheng Cheng Department of Bile Duct Surgery West China Hospital Sichuan University

AIM To evaluate the feasibility of repairing a common bile duct defect with a decellularized ureteral graft in a porcine *** Eighteen pigs were randomly divided into three groups. An approximately 1 cm segment of the common bile duct was excised from all the pigs. The defect was repaired using a 2 cm long decellularized ureteral graft over a T-tube(T-tube group, n = 6) or a silicone stent(stent group, n = 6). Six pigs underwent bile duct reconstruction with a graft alone(stentless group). The surviving animals were euthanized at 3 mo. Specimens of the common bile ducts were obtained for histological *** The animals in the T-tube and stent groups survived until sacrifice. The blood test results were normal in both groups. The histology results showed a biliary epithelial layer covering the neo-bile duct. In contrast, all the animals in the stentless group died due to biliary peritonitis and cholangitis within two months post-surgery. Neither biliary epithelial cells nor accessory glands were observed at the graft sites in the stentless *** Repair of a common bile duct defect with a decellularized ureteral graft appears to be feasible. A T-tube or intraluminal stent was necessary to reduce postoperative complications.

关键词： Decellularization Stent Bile duct injury Biliary reconstruction Ureteral graft

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铁死亡在交通相关PM2.5加重哮喘小鼠气道炎症中的作用

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现代预防医学 2024年第6期51卷 998-1004页

作者：张妍牛泽宇王彩红赵利芳田家瑜刘楠楠关琳琳宋露露郑会秋石东星刘军霞张志红山西医科大学公共卫生学院环境卫生学教研室山西医科大学黄河流域生态公共卫生安全研究中心煤炭环境致病与防治教育部重点实验室

目的探讨铁死亡在交通相关PM2.5加重哮喘小鼠气道炎症中的作用及其机制。方法 50只BALB/c小鼠随机分为5组：生理盐水(NS)组、哮喘(卵清蛋白OVA)组、OVA联合交通源PM2.5低、中、高暴露(分别为1.8、3.6、7.2 mg/kg·bw)组。使用ELISA方... 详细信息

目的探讨铁死亡在交通相关PM2.5加重哮喘小鼠气道炎症中的作用及其机制。方法 50只BALB/c小鼠随机分为5组：生理盐水(NS)组、哮喘(卵清蛋白OVA)组、OVA联合交通源PM2.5低、中、高暴露(分别为1.8、3.6、7.2 mg/kg·bw)组。使用ELISA方法检测肺组织中IL-6和TNF-α的水平；比色法评估肺组织匀浆上清中的还原性谷胱甘肽(GSH)、丙二醛(MDA)以及Fe2+的水平；用western blot法检测前列腺素内过氧化物合酶2(PTGS2)、酰基辅酶A合成酶长链家族成员4(ACSL4)、谷胱甘肽过氧化物酶4(GPX4)和肿瘤蛋白p53(p53)、磷酸化p53(p-p53)、亚精胺/精胺N1-乙酰转移酶1(SAT1)、花生四烯酸15-脂氧合酶(ALOX15)的蛋白表达，并通过qRT-PCR法检测以上除p-p53外其他指标的mRNA表达。采用单因素方差分析比较多组数据，用Tukey检验进一步多重比较。结果 PM2.5刺激明显增加了哮喘小鼠肺组织中IL-6和TNF-α水平，尤其在PM2.5高暴露组(FIL-6=17.910,P<0.001;FTNF-α=5.414,P<0.05)。所有PM2.5暴露组的GSH均下降，其中PM2.5高暴露组的GSH降低最显著(FGSH=13.560,P<0.001)。PM2.5中、高暴露组MDA和Fe2+显著高于OVA组(FMDA=55.230,P<0.001;F_铁=17.660,P<0.001)。PM2.5暴露后PTGS2、ACSL4、ALOX15的蛋白和mRNA表达增高，而GPX4的表达降低。p53、SAT1和ALOX15的蛋白及mRNA表达水平随PM2.5剂量增加而呈现明显的剂量效应，p-p53与p53的蛋白表达趋势一致。结论交通相关PM2.5可能通过p53/SAT1/ALOX15通路诱导哮喘小鼠肺部铁死亡并加重哮喘炎症。

关键词：交通相关PM2.5 铁死亡哮喘气道炎症

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Identification of novel genes associated with duck OASL in response to influenza A virus

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Journal of Integrative Agriculture 2019年第7期18卷 1451-1459页

作者： WANG Xiao-xue lu Chang RONG En-guang HU Jia-xiang xing Yan-ling LIU Zheng-yu GAO Chu-ze LIU Jin-hua HUANG Yin-hua State Key Laboratory of Agrobiotechnology China Agricultural UniversityBeijing 100193P.R. China Key Laboratory of Animal Epidemiology and Zoonosis Ministry of Agriculture/College of Veterinary MedicineChina Agricultural UniversityBeijing 100193P.R.China

2′-5′-Oligoadenylate synthetase like protein(OASL) plays a key role in response to viral infections through selectively activating the OAS/RNase L or OASL/RIG-I signaling *** classic pathway of OASL is well-known,its regulated genes or co-actors are largely *** study the possible molecular mechanism of duck OASL(dOASL),we performed RNA-sequencing(RNA-seq) and immunoprecipitation and mass spectrometry(IP-MS) at the level of mRNA and protein,*** RNA-seq,we used DF1 cell lines(DF1 dO ASL+/+,DF1 cO ASL–/–,and DF1) with or without the CK/0513 H5 N1 virus(A/chicken/huabei/0513/2007) infection.1 737 differentially expressed genes(DEGs) were identified as candidate target genes regulated by *** Ontology(GO),Kyoto Encyclopedia of Genes and Genomes(KEGG) analysis and Weighted Correlation Network Analysis(WGCNA) were *** identified one important yellow co-expression module correlated with antiviral immune *** this module,Ankyrin repeat and FYVE domain containing 1(ANKFY1),harboring a BTB domain similar to the methyl CpG-binding protein 1(MBD1) which bound to OASL in human,was regulated by *** protein level,133 host proteins were ***,ANKFY1 was one of them binding to dOASL *** phylogenomic and chromosomal syntenic analysis demonstrated MBD1 was absent in birds,while mammals *** is suggested that OASL-ANKFY1 interaction might act as a compensatory mechanism to regulate gene expression in *** findings will provide a useful resource for the molecular mechanism research of dOASL.

关键词： duck OASL ANKFY1 compensatory mechanism influenza A virus

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基于茎段外植体的茶树组培苗快繁技术研究

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茶叶学报 2024年第1期65卷 28-36页

作者：李家兴朱俊彦张有泽朱木兰陈泓蓉任露露刘升锐姚明哲韦朝领安徽农业大学茶树生物学与资源利用国家重点实验室/农业农村部茶树生物学与茶叶加工重点实验室安徽合肥230036 中国农业科学院茶叶研究所浙江杭州310024 中国科学院分子植物科学卓越创新中心上海200032

【目的】目前,茶树组培苗繁育存在诱导出芽效率不高、繁殖系数较低等问题。因此,为提高茶树种质资源保存繁育效率,丰富保存手段与技术,建立一种高效、快速、实用的基于茎段外植体的茶树组织培养高效快繁技术体系非常必要。【方法】选用... 详细信息

【目的】目前,茶树组培苗繁育存在诱导出芽效率不高、繁殖系数较低等问题。因此,为提高茶树种质资源保存繁育效率,丰富保存手段与技术,建立一种高效、快速、实用的基于茎段外植体的茶树组织培养高效快繁技术体系非常必要。【方法】选用来自安徽省六安市舒城县鲍家村群体种的一个国家级品种‘报春1号’作为研究试材,对该品种进行组织培养快繁技术的探索,包括消毒、定芽诱导、不定芽诱导(I期和II期)、芽伸长、以及生根等阶段。【结果】离体快繁:最佳定芽诱导培养基为MS+3 mg·L^(-1)6-苄基腺嘌呤(6-BA),诱导率达82.2%;不定芽增殖I期最佳培养基为MS基础培养基(MS)+2 mg·L^(-1)6-BA+0.2 mg·L^(-1)萘乙酸(NAA),诱导率为77.78%,平均芽数为5.4个;不定芽增殖II期最佳培养基为MS+1 mg·L^(-1)6-BA+0.3 mg·L^(-1)NAA+2 mg·L^(-1)噻苯隆(TDZ),诱导芽数最多(平均值为10.43个),芽苗呈绿色,叶片舒展;不定芽伸长最佳培养基为MS+0.8 mg·L^(-1)6-BA+0.08 mg·L^(-1)NAA,伸长率为63.33%;不定根诱导培养基以1/2MS培养基+3 mg·L^(-1)IBA效果较佳。【结论】本研究结果建立了一种基于茎段外植体的茶树组织培养高效快繁技术,将对优良茶树品种的保存繁育及其高效利用提供理论基础。

关键词：茶树组培苗组织培养茎段外植体高效快繁

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LAI scale effect research based on compact airborne spectrographic imager data in the Heihe Oasis

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Journal of Mountain Science 2021年第6期18卷 1630-1645页

作者： DAI Xiao-ai LIU Chao LI Nai-wen WANG Mei-lian YANG Yu-wei YANG xing-ping ZHANG Shi-qi HE Xu-wei YANG Zheng-li lu Heng LI Jing-zhong WANG ze-kun School of Earth Science Chengdu University of TechnologyChengdu 610059China State Key Laboratory of Hydraulics and Mountain River Engineering Sichuan UniversityChengdu 610065China College of Hydraulic and Hydroelectric Engineering Sichuan UniversityChengdu 610065China Hong Kong Polytechnic University Hongkong 999077China School of Resource and Environment Sciences Wuhan UniversityWuhan 430072China Department of Mechanical Engineering Auburn UniversityAuburn 36849America

As one of the key parameters for characterizing crop canopy structure, Leaf Area Index(LAI) has great significance in monitoring the crop growth and estimating the yield. However, due to the nonlinearity and spatial heterogeneity of LAI inversion model, there exists scale error in LAI inversion result, which limits the application of LAI product from different remote sensing data. Therefore, it is necessary to conduct studies on scale effect. This study was based on the Heihe Oasis, Zhangye city, Gansu province, China and the following works were carried out: Airborne hyperspectral CASI(Compact Airborne Spectrographic Imager) image and LAI statistic models were adopted in muti-scale LAI inversion. The overall difference of muti-scale LAI inversion was analyzed in an all-round way. This was based on two aspects, "first inversion and then integration" and "first integration and then inversion", and on scale difference characteristics of three scale transformation methods. The generation mechanism of scale effect was refined, and the optimal LAI inversion model was expanded by Taylor expansion. By doing so, it quantitatively analyzed the contribution of various inversion processes to scale effect. It was found that the cubic polynomial regression model based on NDVI(940.7 nm, 712 nm) was the optimal model, where its coefficient of determination R2 and the correlation coefficient of test samples R reached 0.72 and 0.936, respectively. Combined with Taylor expansion, it analyzed the scale error generated by LAI inversion model. After the scale effect correction of one-dimensional and twodimensional variables, the correlation coefficient of CCD-LAI(China Environment Satellite HJ/CCD images) and CASI-LAI products(Compact Airborne Spectro graphic Imager products) increased from 0.793 to 0.875 and 0.901, respectively. The mean value, standard deviation, and relative true value of the two went consistent. Compared with onedimensional variable correction method, the twodimensi

关键词： Vegetation index Leaf Area Index Scale effect Taylor series expansion model

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