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过滤器连接螺栓断裂失效分析

科学技术与工程 2024年第8期24卷 3180-3185页

作者：黄思语李晴朝唐源付国忠刘彦霆唐健凯吴昊中国核动力研究设计院核反应堆系统设计重点实验室成都610213

某防喷器油路过滤器SCM435连接螺栓在使用过程中发生断裂,造成过滤器无法正常工作。为查找连接螺栓失效原因,采用金相显微镜、拉伸试验机、冲击试验机、显微硬度计、扫描电子显微镜和能谱仪等测试手段,研究断裂和未断裂螺栓的显微组织... 详细信息

某防喷器油路过滤器SCM435连接螺栓在使用过程中发生断裂,造成过滤器无法正常工作。为查找连接螺栓失效原因,采用金相显微镜、拉伸试验机、冲击试验机、显微硬度计、扫描电子显微镜和能谱仪等测试手段,研究断裂和未断裂螺栓的显微组织、化学成分、硬度、力学性能和断口形貌。结果表明:断裂和未断裂螺栓的组织均为回火索氏体和铁素体,断裂螺栓夹杂物较多,碳含量偏高,断裂螺栓的硬度和力学性能均低于未断裂螺栓。断裂螺栓断口在平行和斜45°的两个断面,表现为韧性断裂和脆性断裂的混合断裂形式,断裂源起源于内部。可见断裂螺栓是由于内部的碳化物等脆性相的不均匀分布,在持续外力作用下,优先形成裂纹源,随着裂纹的扩展而导致螺栓最终断裂。

关键词：连接螺栓断裂失效显微组织力学性能

Acidic open-cage solution containing basic cage-confined nanospaces for multipurpose catalysis

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National Science Review 2022年第5期9卷 99-107页

作者： Kang Li Kai wu yan-zhong Fan Jing Guo yu-Lin Lu yuan-Fan Wang Guillaume Maurin Cheng-Yong Su MOE Laboratory of Bioinorganic and Synthetic Chemistry Lehn Institute of Functional MaterialsSchool of ChemistrySun Yat-sen University School of Chemistry South China Normal University Institute Charles Gerhardt Montpellier Centre National de la Recherche Scientifiqueécole Nationale Supérieure de Chimie de MontpellierUniversité de Montpellier

The nanoscale chemical spaces inherent in porous organic/coordination cages or solid/liquid materials have been continuously explored for their nanoconfinement effect on selective adsorption and reaction of small gas or organic ***,we aim to rationalize the unconventional chemical reactivities motivated by the cage-confined nanospaces in aqueous solutions,where the robust yet permeable nanospaces defined by the open cages facilitate dynamic guest exchange and unusual chemical *** high positive charges on [(Pd/Pt)6(RuL3)8]28+nanocages drive imidazole-proton equilibrium to display a significantly perturbed pKashift,creating cage-defined nanospaces in solution with distinct intrinsic basicity and extrinsic *** supramolecular cage effect plays pivotal roles in elaborating robust solution nanospaces,controlling ingress-and-egress molecular processes through open-cage portals and endowing nanocages with transition-state stabilization,amphoteric reactivities and the phase transfer of insoluble molecules,thus promoting chemical transformations in unconventional ***,a wide range of application of cage-confined catalysis with anomalous reactivities maybe expected based on this kind of open-cage solution medium,which combines cage nanocavity,solution heterogeneity and liquid-phase fluidity to benefit various potential mass transfer and molecular process options.

关键词： open-cage solution supramolecular cage effect supramolecular catalysis cage-confined catalysis cage-confined nanospaces in solution

Liver Stiffness Measurement can Predict Liver Inflammation in Chronic Hepatitis B Patients with Normal Alanine Transaminase

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Journal of Clinical and Translational Hepatology 2023年第4期11卷 817-826页

作者： Ling-Ling Huang Xue-ping yu Qing-Fa ruan yan-Xue Lin Huan Li Wen Jin Rui-Feng Liu yan-Lan Liang yu-Rui Liu yue-Yong Zhu Jia-Ji Jiang Ri-Cheng Mao Da-wu Zeng Department of Hepatology Hepatology Research InstituteThe First Affiliated hospitalFujian Medical UniversityFuzhouFujianChina Department of Infectious Diseases The First Hospital of Quanzhou Affiliated to Fujian Medical UniversityQuanzhouFujianChina Hepatology Center Xiamen Hospital of Traditional Chinese MedicineXiamenFujianChina Department of Infectious Diseases Shanghai Key Laboratory of Infectious Diseases and Biosafety Emergency ResponseNational Medical Center for Infectious DiseasesHuashan HospitalFudan UniversityShanghaiChina Hepatology Mengchao Hepatobiliary Hospital of Fujian Medical UniversityFuzhouFujianChina Hepatology Fujian Medical University Xiamen Humanity HospitalXiamenFujianChina

Background and Aims:To determine whether liver stiffness measurement(LSM)indicates liver inflammation in chronic hepatitis B(CHB)with different upper limits of normal(ULNs)for alanine aminotransferase(ALT).Methods:We grouped 439 CHB patients using different ULNs for ALT:cohort I,≤40 U/L(439 subjects);cohort II,≤35/25 U/L(males/females;330 subjects);and cohort III,≤30/19 U/L(males/females;231 subjects).Furthermore,84 and 96 CHB patients with normal ALT(≤40 U/L)formed the external and prospective validation groups,respectively We evaluated the correlation between LSM and biopsy-confirmed liver inflammation,and determined diagnostic accuracy using area under the curve(AUC).A noninvasive LSM-based model was developed using multivariate logistic ***:Fibrosis-adjusted LSM values significantly increased with increasing *** AUCs of LSM in cohorts I,II,and III were 0.799,0.796,and 0.814,respectively,for significant inflammation(A≥2)and 0.779,0.767,and 0.770,respectively,for severe inflammation(A=3).Cutoff LSM values in all cohorts for A≥2and A=3 were 6.3 and 7.5 kPa,***,external,and prospective validations showed high diagnostic accuracy of LSM for A≥2 and A=3,and no significant differences in AUCs among the four *** and globulin independently predicted A≥*** AUC of an LSM-globulin model for A≥2 exceeded those of globulin,ALT,and AST,but was similar to that of ***:LSM predicted liver inflammation and guided the indication of antiviral therapy for CHB in patients with normal ALT.

关键词： Hepatitis B virus Liver inflammation Fibrosis Liver stiffness measurement Alanine aminotransferase

Influence of Impurity Na_2O on Crystalline Structure of Cordierite Synthesized from Aluminum Sludge

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Chinese Journal of Structural Chemistry 2005年第1期24卷 29-34页

作者：于岩阮玉忠杜育红吴任平 College of Materials Science and Engineering Fuzhou University Fuzhou 350002 China

By adding small amount of TiO2, aluminum slag could be used to synthesize cor- dierite. α-Al2O3, TiO2 and dehydrated talc could generate solid solution to accelerate the solid-state reaction to form cordierite. The experimental results show that the content of cordierite increases with the increase of TiO2 added. 3.0% of TiO2 is determined to be the best amount, because all crystalline substances are converted into cordierite at this content. Philips X’pert plus software analysis shows that when the content of TiO2 is from 0 to 1.0%, cordierite has the same hexagonal structure as the single crystal and the lattice parameters change slightly; when the content of TiO2 is from 1.0 to 2.0%, the cordierite still keeps hexagonal structure but the lattice parameters change greatly; when the content of TiO2 is from 2.0 to 3.5%, the cordierite is converted from hexagonal into rhombic and the lattice parameters change accordingly.

关键词： aluminum slag TiO2 mineralizer cordierite crystalline structure

Efficacy of the herbal pair, Radix Achyranthis Bidentatae and Eucommiae Cortex, in preventing glucocorticoid-induced osteoporosis in the zebrafish model

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Journal of Integrative Medicine 2022年第1期20卷 83-90页

作者： Joon-ho Lee yuan-ji Wei zhong-yan Zhou yu-ming Hou Cheng-long Wang Li-bo Wang Hong-jin wu yu Zhang Wei-wei Dai Central Laboratory of Science and Technology Department Longhua HospitalShanghai University of Traditional Chinese MedicineShanghai 200032China Cardiovascular Department Longhua HospitalShanghai University of Traditional Chinese MedicineShanghai 200032China

Objective: In traditional Chinese medicine, the herbal pair, Radix Achyranthis Bidentatae(RAB) and Eucommiae Cortex(EC), is widely used to treat osteoporosis. Herein, we determined whether this herbal pair can be used to ameliorate glucocorticoid(GC)-induced osteoporosis(GIOP) and find its optimal dosage in ***: The characteristics of the aqueous extract of RAB and EC were separately characterized using high-performance liquid chromatography. Osteoporosis was induced in 5-day post-fertilization zebrafish larvae by exposing them to 10 lmol/L dexamethasone(Dex) for 96 h. Seven combinations of different ratios of RAB and EC were co-administered. Treatment efficacy was determined by calculating zebrafish vertebral area and sum brightness, via alizarin red staining, and by detecting alkaline phosphatase(ALP)activity. Multiple regression analysis was conducted to test the optimal dosage ***: According to the Chinese Pharmacopoeia(2015), b-ecdysone(b-Ecd) is a major bioactive marker in RAB extract, while pinoresinol diglucoside(PDG) is the major marker in EC extract. Both of b-Ecd and PDG content values aligned with the Chinese Pharmacopoeia standards. Treatment with 10 lmol/L Dex reduced zebrafish vertebral area, sum brightness, and ALP activity, but RAB and EC attenuated these effects. Combining 50 mg/m L RAB and 50 mg/m L EC was optimal for preventing GIOP in *** transcription-quantitative polymerase chain reaction was used to evaluate the m RNA expression of osteogenesis-related genes. A treatment of 10 lmol/L Dex decreased runt-related transcription factor 2(Runx2), osteogenic protein-1(OP-1), bone c-carboxyglutamic acid-containing protein(BGLAP), and bcatenin levels. This effect was counteracted by RAB and EC co-treatment(P < 0.05). Additionally, the effect of using the two herbal extracts together was better than single-herb treatments separately. These results demonstrated that RAB and EC preserve osteoblast function in the pre

关键词： Glucocorticoid Osteoporosis Radix Achyranthis Bidentatae Eucommiae Cortex Zebrafish

基于白光中子源的^(197)Au中子辐射俘获截面测量及共振参数分析

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物理学报 2024年第7期73卷 104-113页

作者：罗淏天张奇玮栾广源王晓宇邹翀任杰阮锡超贺国珠鲍杰孙琪黄翰雄王朝辉吴鸿毅顾旻皓余滔解立坤陈永浩安琪白怀勇鲍煜曹平陈昊磊陈琪萍陈裕凯陈朕崔增琪樊瑞睿封常青高可庆韩长材韩子杰何泳成洪杨黄蔚玲黄锡汝季筱璐吉旭阳蒋伟江浩雨姜智杰敬罕涛康玲康明涛李波李超李嘉雯李论李强李晓李样刘荣刘树彬刘星言穆奇丽宁常军齐斌斌任智洲宋英鹏宋朝晖孙虹孙康孙晓阳孙志嘉谭志新唐洪庆唐靖宇唐新懿田斌斌王丽娇王鹏程王琦王涛峰文杰温中伟吴青彪吴晓光吴煊羊奕伟易晗于莉于永积张国辉张林浩张显鹏张玉亮张志永赵豫斌周路平周祖英朱丹阳朱科军朱鹏朱兴华中国原子能科学研究院核数据重点实验室北京102413 中国科学院高能物理研究所北京100049 散裂中子源科学中心东莞523803 核探测与核电子学国家重点实验室北京100049 中国科学技术大学近代物理系核探测与核电子学国家重点实验室合肥230026 北京大学物理学院核物理与核技术国家重点实验室北京100871 中国工程物理研究院核物理与化学研究所绵阳621900 西北核技术研究院西安710024 中国科学院大学北京100049 中国科学技术大学工程与应用物理系合肥230026 北京航空航天大学物理学院北京100083 华能山东石岛湾核电有限公司荣成264312

中子辐射俘获反应在反应堆运行、核装置设计及核天体物理研究中起重要的作用.4πBaF_(2)探测装置有着高时间分辨能力、低中子灵敏度、高探测效率等优点,适合开展中子辐射俘获反应截面数据的测量.中国原子能科学研究院核数据重点实验室... 详细信息

中子辐射俘获反应在反应堆运行、核装置设计及核天体物理研究中起重要的作用.4πBaF_(2)探测装置有着高时间分辨能力、低中子灵敏度、高探测效率等优点,适合开展中子辐射俘获反应截面数据的测量.中国原子能科学研究院核数据重点实验室建立了伽马全吸收装置(Gamma total absorption facility,GTAF),该装置用28块六棱BaF_(2)晶体和12块五棱BaF_(2)晶体构成了外径25 cm,内径10 cm的球壳,覆盖了95.2%的立体角.利用GTAF在中国散裂中子源Back-n束线上,测量了197Au(n,γ)的反应截面数据.测量数据通过能量筛选、PSD方法、晶体多重性筛选进行了初步本底扣除,随后结合对^(nat)C及空样品的测量数据对本底进行了分析及扣除,获得了197Au俘获反应的产额,利用SAMMY程序拟合得到了^(197)Au在1—100 e V的共振能量、中子共振宽度和伽马共振宽度参数.实验测量结果与ENDF/B-VIII.0数据库符合良好,其共振参数存在一定差异,分析原因可能与GTAF能量分辨率、Back-n的中子能谱测量精度、以及实验本底扣除方法相关,这也是下一步工作的重点.

关键词：中子辐射俘获截面共振参数白光中子源伽马全吸收装置

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四川盆地及周缘地区震旦系灯影组白云岩岩石类型及沉积相划分方案

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天然气工业 2024年第7期44卷 27-41页

作者：文华国文龙丁一周刚钟怡江严威马奎钟原王文之张亚武鲁亚何宇邹浩文许亚鑫油气藏地质及开发工程全国重点实验室•成都理工大学自然资源部深时地理环境重建与应用重点实验室•成都理工大学成都理工大学沉积地质研究院中国石油西南油气田公司中国石油西南油气田公司勘探开发研究院

四川盆地震旦系灯影组有巨大的天然气勘探潜力,但其储层白云岩岩石类型划分和沉积环境解析方面尚存较大争议,不利于沉积相及有利储集相带展布的精确刻画,制约了下一步油气勘探开发进程。为此,针对四川盆地及周缘地区大量的露头和钻井开... 详细信息

四川盆地震旦系灯影组有巨大的天然气勘探潜力,但其储层白云岩岩石类型划分和沉积环境解析方面尚存较大争议,不利于沉积相及有利储集相带展布的精确刻画,制约了下一步油气勘探开发进程。为此,针对四川盆地及周缘地区大量的露头和钻井开展了系统的岩相和沉积环境分析,在明确白云岩类型的基础上,结合岩性组合方式进一步识别了沉积相,并与前人提出的岩性和沉积相划分方案进行了对比与总结,建立了一套既适用于油气勘探又满足沉积学研究的白云岩岩石类型和沉积相划分方案。研究结果表明:①按结构成因可将灯影组白云岩划分为2大类6种类型16种亚类,即保留原始沉积结构的白云岩大类,包括颗粒白云岩、泥晶白云岩、微生物(藻)黏结白云岩,并进一步细分了9种亚类;原岩经过成岩改造形成的白云岩大类包括葡萄状白云岩、角砾白云岩、晶粒白云岩,并可进一步细分7种亚类。②研究区白云岩可识别出台地边缘和局限台地2个相带,共包含8种亚相和17种微相,其中台地边缘相可以划分为微生物(藻)丘、丘滩间洼地、浅滩3个亚相8种微相;局限台地相可划分为微生物(藻)丘、丘滩间海、浅滩、台内洼地、潟湖5种亚相9种微相。③台地边缘相比局限台地相具有丘滩占比大,单层厚度大和叠覆式产出的特征。④丘基—丘核—丘坪—丘盖生长序列反映了微生物丘完整生长—淹没过程,丘基—丘核—丘坪序列可以与潮下—潮间—潮上米级向上变浅旋回相匹配。结论认为,研究提出的丘滩微相划分方案丰富和完善了该区沉积环境解释的理论基础,并具有较强的油气勘探适用性。

关键词：四川盆地震旦系灯影组白云岩岩石类型沉积相

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聚酰胺-胺树形大分子吸附分离材料的构筑及应用研究进展

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离子交换与吸附 2024年第1期40卷 1-13页

作者：刘同河王柄翔吴开彦汪佳璇牛余忠鲁东大学化学与材料科学学院

聚酰胺-胺(PAMAM)树形大分子具有高度支化的分子结构和丰富的叔胺、酰胺和氨基等功能基团，且各功能基团随树形大分子代数增加呈规律性增加和排布，为吸附位点的集中、层次性分布提供了理想的模板。同时，PAMAM树形大分子具有良好的水... 详细信息

聚酰胺-胺(PAMAM)树形大分子具有高度支化的分子结构和丰富的叔胺、酰胺和氨基等功能基团，且各功能基团随树形大分子代数增加呈规律性增加和排布，为吸附位点的集中、层次性分布提供了理想的模板。同时，PAMAM树形大分子具有良好的水溶性、稳定性和pH响应性，可通过调控树形大分子的代数、中心核、外层端基以及溶液pH等提升其对不同水体环境的适应性及对目标物的选择性吸附分离性能，因此，以PAMAM树形大分子构筑吸附分离材料在金属离子、染料、生物分子和药物分子以及CO2的吸附分离领域具有重要应用。本文对PAMAM树形大分子吸附分离材料的构筑及应用研究进展进行了全面总结，并展望了该类材料未来的应用前景和发展方向。

关键词： PAMAM树形大分子构筑吸附应用

竹原纤维与传统烟草在再造烟叶中的应用及对比分析

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造纸技术与应用 2024年第1期52卷 8-10页

作者：周俊吴建霖王小升陈宇超宋粉艳熊珍李忠任中烟施伟策(云南)再造烟叶有限公司云南玉溪653100

利用竹原纤维作为原料制备再造烟叶,通过与传统再造烟叶进行对比分析,结果表明:(1)竹原纤维相对烟草原料较难研磨,其纤维断裂和破壁情况与烟草原料相似;(2)竹原纤维随着目数的增加,抗张强度增加,透气度随之降低;烟草随着目数的增加,抗... 详细信息

利用竹原纤维作为原料制备再造烟叶,通过与传统再造烟叶进行对比分析,结果表明:(1)竹原纤维相对烟草原料较难研磨,其纤维断裂和破壁情况与烟草原料相似;(2)竹原纤维随着目数的增加,抗张强度增加,透气度随之降低;烟草随着目数的增加,抗张强度增加,透气度随之降低,其结果与竹原纤维制备的样品相似;(3)在同目数的条件下,竹原纤维制备的再造烟叶缺点相对烟草制备的多,主要表现在香气的质感、杂气及余味等方面,但随着竹原纤维超细粉目数的增加,质感、杂气和余味方面有所改善,烟气质感稍细,杂气稍轻,刺激稍小。

关键词：竹原纤维烟草原料粒径香气