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Effect of SiC whiskers on the oxidation protective properties of SiC coatings for carbon/carbon composites

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Rare Metals 2006年第1期25卷 58-62页

作者： SHI Xiaohong LI Hejun FU Qiangang LI Kezhi zhang xiulian The Key Laboratory of Superhigh Temperature Composites Northwestern Polytechnical University Xi＇an 710072 China

In order to effectively employ the unique high temperature mechanical properties of carbon/carbon composite substrates, SiC coatings reinforced by SiC whiskers were prepared by pack cementation method. The effect of SiC whiskers on the oxidation resistance properties of the single-layer coating and double-layer coating was investigated. SiC whiskers in the single-layer SiC coating have little effect on the anti-oxidation property but obviously improve the thermal shock property. The double-layer coating with inner-layer reinforced coating exhibits more perfect anti-oxidation ability than the double-layer coating with SiC inner-layer coating.

关键词： carbon/carbon composites SiC coating oxidation protection SiC whiskers

Research on Diageneses of Cambrian Shoal Facies Carbonate Rocks in the Xiadong Area, Hubei Province

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Acta Geologica Sinica(English Edition) 2001年第2期75卷 161-174页

作者： zhang xiulian and JIANG Lingzhi Department of Geology, Peking University, Beijing 100871 Peking Univ Dept Geol Beijing 100871 Peoples R China

With continuous outcrops, developed shoal facies rocks, complete types of diagenesis and changeable diagenetic environments, Cambrian strata are well developed in the Xiadong area, Yichang, Hubei Province. Under the combined influence of numerous diageneses, secondary pores can be formed, which result in better reservoir properties of the rock strata.

关键词： diagenesis diagenetic facies interval diagenetic stage diagenetic environment

Petrographic Features and Sedimentary Environments of the Middle-Upper Ordovician at Shetai Town of Urad Front Banner, Inner Mongolia

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Acta Geologica Sinica(English Edition) 1991年第4期65卷 401-416,459页

作者： zhang xiulian Wang Yinghua Pan Rongsheng Department of Geology,Peking University Liu Linqun Department of Geology Peking University

Most of the hinterland of the North China platform is devoid of Late Ordovician strata. The BaiyanhuaMountain section at Shetai Town is a standard section of the Upper Ordovician newly established in recentyears at the northernmost margin of the platform. This establishment directly involved the determination of thenorth boundary of the platform and the understanding of its evolutionary Listory. The area is quite differentfrom the binterland of the platform in Middle Ordovician rock types and sedimentary environments, with theformer characterized by frequent slope deposits and the latter consisting almost entirely of platform deposits.The present paper focuses on the petrographic features and sedimentary ervironments of the Middle-UpperOrdovician strata in the area, providing further theoretical support to the establishment of the section and fil-ling the gap in this respect.

关键词： Petrographic Features and Sedimentary Environments of the Middle-Upper Ordovician at Shetai Town of Urad Front Banner

急性非静脉曲张性上消化道出血治疗中内镜止血的效果

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中国医学创新 2024年第14期21卷 5-9页

作者：张秀莲关聪聪陈飞旭北京市健宫医院消化内科北京100054

目的:探讨急性非静脉曲张性上消化道出血(ANVUGIB)患者开展内镜止血的临床效果及对住院时间、止血时间的影响。方法:开展回顾性分析,病历资料选取于2019年1月—2022年12月,对象为北京市健宫医院收治的80例ANVUGIB患者,根据治疗方法的不... 详细信息

目的:探讨急性非静脉曲张性上消化道出血(ANVUGIB)患者开展内镜止血的临床效果及对住院时间、止血时间的影响。方法:开展回顾性分析,病历资料选取于2019年1月—2022年12月,对象为北京市健宫医院收治的80例ANVUGIB患者,根据治疗方法的不同分为对照组(予以常规内科止血治疗)与观察组(实行内镜止血),各40例。观察对比两组治疗效果、止血成功率和再出血率、治疗指标、凝血功能指标、血红蛋白、血氧饱和度、动脉血氧分压、急性生理和慢性健康状况评价Ⅱ(APACHEⅡ)评分。结果:相比于对照组,观察组总有效率高(95.00%vs 77.50%)(P<0.05)。与对照组相比,观察组止血时间、住院时间均明显短,出血量显著少(P<0.05)。相比于对照组,观察组止血成功率高,再出血率低(P<0.05)。治疗后,观察组PT、TT水平均短于对照组(P<0.05)。治疗后,两组血红蛋白、血氧饱和度、动脉血氧分压均较治疗前升高,APACHEⅡ评分均较治疗前下降,且观察组均优于对照组(P<0.05)。结论:ANVUGIB患者实施内镜止血,可取得确切疗效,止血速度快,且降低再出血风险,有利于维持患者生命体征稳定,加快疾病康复进程,缩短住院时间,取得良好预后。

关键词：急性非静脉曲张性上消化道出血内镜止血住院时间

Diagenesis and Porosity of the Cambrian-Ordovician Carbonate Shoal Fades at Yangjiaping, Shimen, Hunan

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Acta Geologica Sinica(English Edition) 2000年第1期74卷 29-45,116-117页

作者： zhang xiulian, WANG Yinghua and CHEN Xiaolong Department of Geology, Peking University, Beijing 100871 Peking Univ Dept Geol Beijing 100871 Peoples R China

Upper Cambrian-Lower Ordovician shoal-facies carbonate rocks are well developed in the Yangjiap-ing section, Shimen, Hunan, and their types are also highly varied. There are both monomictic shoal-facies rocks (e.g. sparite oolitic limestone and sparite calcarenite) and polymictic shoal-facies rocks (e.g. grainstone, whose grain types include sand- and pebble-sized fragments, bioclasts, oolites, algal mats etc.). What is different is that the Upper Cambrian shoal-facies rocks have been mostly strongly dolomitized into shoal-facies dolomite with various residual textures. This paper presents an in-depth study of various kinds of diagenesis and pore space evolution occurring in this section and suggests that the diagenetic sequences of shoal-facies rocks in the study area is dominantly of retrogressive type.

关键词： rock types dolomitization dissolution diagenetic sequence

CO2-facilitated upcycling of polyolefin plastics to aromatics at low temperature

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National Science Review 2024年第5期11卷 236-243页

作者： Yi Ding Shuchi zhang Cheng Liu Yu Shao xiulian Pan Xinhe Bao State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences University of Chinese Academy of Sciences Department of Chemical Physics University of Science and Technology of China

Plastics are one of the most produced synthetic materials and largest commodities, used in numerous sectors of human life. To upcycle waste plastics into value-added chemicals is a global challenge. Despite significant progress in pyrolysis and hydrocracking, which mainly leads to the formation of pyrolysis oil,catalytic upcycling to value-added aromatics, including benzene, toluene and xylene（BTX）, in one step, is still limited by high reaction temperatures（>500°C） and a low yield. We report herein CO2-facilitated upcycling of polyolefins and their plastic products to aromatics below 300°C, enabled by a bifunctional Pt/Mn Ox-ZSM-5 catalyst. ZSM-5 catalyzes cracking of polyolefins and aromatization, generating hydrogen at the same time, while Pt/Mn Ox catalyzes the reaction of hydrogen with CO2, consequently driving the reaction towards aromatization. Isotope experiments reveal that 0.2 kg CO2is consumed per 1.0 kg polyethylene and 90% of the consumed CO2is incorporated into the aromatic products. Furthermore, this new process yields 0.63 kg aromatics（BTX accounting for 60%）, comparing favorably with the conventional pyrolysis or hydrocracking processes, which produce only 0.33 kg aromatics. In this way, both plastic waste and the greenhouse gas CO2are turned into carbon resources, providing a new strategy for combined waste plastics upcycling and carbon dioxide utilization.

关键词： polyolefins carbon dioxide aromatics upcycling bifunctional catalysis

SAPO-34 facilitates the formation of benzene,toluene and xylenes in direct syngas conversion over MnCrO_(x)-SAPO-34-ZSM-5

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Science China Chemistry 2024年第2期67卷 732-740页

作者： Shuchi zhang Dengyun Miao Yi Ding Mengyuan Li Shujing Guo Yujuan zhang xiulian Pan Xinhe Bao State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian116023China University of Chinese Academy of Sciences Beijing100049China Shaanxi Yanchang Petroleum(Group)Co. Ltd.&Dalian Institute of Chemical Physics Xi’an Clean Energy(Chemical Industry)Research InstituteXi’an710000China

Direct conversion of syngas to aromatics over metal oxide and zeolite(OXZEO) composite catalysts is ***,the selectivity of more valuable products such as benzene,toluene and xylenes(BTX) is limited due to undesired secondary methylation of ***,we report that the introduction of SAPO-34 into MnCrO_(x)-ZSM-5 catalyst enhances significantly the formation of BTX without sacrificing the aromatics *** optimized conditions,the fraction of BTX in aromatics reaches 64.7% versus 28.9% over the catalyst without SAPO-34.A number of model reaction tests and characterizations reveal that SAPO-34 consumes partially the intermediates such as ketene,by converting them to light ***,the methylation of BTX by ketene to heavy aromatics is inhibited over the external acid sites of ZSM-5,leading to an enhanced BTX selectivity in the *** hybrid catalyst provides an efficient method for highly selective synthesis of BTX from syngas.

关键词： selective syngas conversion OXZEO aromatics BTX multi-functional catalysts

sIgE和sIgG4联合检测在过敏性疾病中的应用研究

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中国卫生标准管理 2024年第17期15卷 117-121页

作者：张秀莲杨旭凯陈晔陈茂琳陈祖阵福建省三明市第二医院检验科福建三明366000 杭州浙大迪迅生物基因工程有限公司市场部浙江杭州310000 清流县总医院检验科福建清流365399 尤溪县总医院检验科福建尤溪365199 福建省三明市中西医结合医院生殖中心福建三明353000

目的了解过敏性疾病患者过敏原特异性IgE抗体(specific IgE,sIgE)和食物特异性IgG4抗体(specific IgG4,sIgG4)分布特点,为临床诊治提供依据。方法选取2022年5月19日—2023年11月14日在福建省三明市第二医院就诊的过敏性患者1617例为试... 详细信息

目的了解过敏性疾病患者过敏原特异性IgE抗体(specific IgE,sIgE)和食物特异性IgG4抗体(specific IgG4,sIgG4)分布特点,为临床诊治提供依据。方法选取2022年5月19日—2023年11月14日在福建省三明市第二医院就诊的过敏性患者1617例为试验对象,联合检测sIgE、sIgG4。结果1617例过敏性患者中,sIgE阳性率为45.83%,sIgG4阳性率为75.02%,sIgE和s IgG4同时阳性占比为42.52%;s IgE检测中吸入性过敏原阳性率户尘螨/粉尘螨最高,为34.45%;食入性过敏原牛奶最高,为8.23%;sIgG4检测阳性率前两位为鸡蛋、牛奶,分别为66.54%、47.68%。sIgE致敏程度集中在1~2级,以1种阳性为主,sIgG4致敏程度集中在3级,以2种阳性为主。男性户尘螨/粉尘螨、蟑螂、混合草、牛奶、蟹和虾sIgE阳性率均高于女性(P<0.05),牛奶、鳕鱼和小麦sIgG4阳性率均高于女性(P<0.05);成年组户尘螨/粉尘螨、混合草和牛奶sIgE阳性率均低于未成年组(P<0.05);牛奶、鸡蛋、大豆、鳕鱼和小麦sIgG4阳性率均显著低于未成年组(P<0.05);通过医生指导过敏原干预后症状改善者占比88.89%。结论sIgE和sIgG4联合检测对防治过敏具有重要的指导意义,通过检测指导干预能有效改善症状。

关键词：过敏性疾病过敏原特异性IgE 特异性IgG4 联合检测饮食干预

Liposomal codelivery of inflammation inhibitor and collagen protector to the plaque for effective anti-atherosclerosis

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Chinese Chemical Letters 2023年第1期34卷 239-244页

作者： Xiaotong Li Jiayi Gu Qingqing Xiao Ying Liu Ping Zhou Lifang Fan xiulian zhang Xiang Lu Jun Wu Zhengxia Liu Wei He School of Pharmacy China Pharmaceutical UniversityNanjing 211198China Department of Geriatrics The Second Affiliated HospitalNanjing Medical UniversityNanjing 210011China Key Laboratory for Aging&Disease Nanjing Medical UniversityNanjing 210011China Jiangsu Aosaikang Pharmaceutical Co. Ltd.Nanjing 211112China Department of Respiratory Disease Baoshan BranchShuguang HospitalShanghai University of Traditional Chinese MedicineShanghai 200120China Department of Geriatric Cardiology Jiangsu Provincial Key Laboratory of GeriatricsThe First Affiliated Hospital of Nanjing Medical UniversityNanjing 210029China Department of Geriatrics The Affiliated Sir Run Run Hospital of Nanjing Medical UniversityNanjing 211166China

Plaque plays a central role in atherosclerosis(AS)progression,whereas inflammation and destruction of the plaque microenvironment contribute to plaque *** a result,a therapy regime,which combines anti-inflammation and inhibition-degradation of plaque matrix,appears to be a promising strategy to combat ***,we report a p H-sensitive liposome co-loading with the anti-inflammatory agent(oridonin,ORD)and plaque-collagen protector(marimastat)for anti-AS *** was first conjugated with hyaluronic acid(HA)to target the inflammation contributor,pro-inflammatory ***,the conjugate assembled onto the MATT-loaded *** co-loaded system(150 nm)significantly improved pharmacokinetics over the liposomes without anchoring the conjugate and accumulated effectively in the *** preparation administration allowed efficient anti-AS activities in high-fat diet(HFD)-Apoe-/-mice by decreasing the pro-inflammatory cytokine expression in the serum,lessening the lesion area,alleviating the plaque collagen degradation,promoting macrophage polarization from phenotypic M1 to M2,reducing T helper(Th)17 cells(Th17)/T regulatory cells(Tregs)and Th1/Th2 ratio,***,the serum determination in AS patients demonstrated high expression of the inflammatory cytokines,indicating our finding may offer a potential guideline for clinical practice.

关键词： Atherosclerosis Plaque Inflammation Collagen Macrophages Co-delivery Liposomes