检索结果-南通市图书馆

Sintering densification behavior and kinetic mechanism of nano-tungsten powder prepared by sol-spray drying

Tungsten 2020年第4期2卷 371-380页

作者： Zhi‑Yuan Du Yong‑Qi Lv Yong Han jing‑lian fan Lei Ye State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China

Due to its excellent mechanical and radiation resistance performance,fine-grained tungsten becomes an ideal plasma facing material in fusion ***,the preparation of fine-grained tungsten by ultrafine powder is faced with some problems,such as low density,coarse grain and not suitable for engineering *** this paper,nano-tungsten powders prepared by“sol-spray drying-calcination-hydrogen thermal reduction”process were sintered by non-isothermal ordinary pressureless sintering,and the densification behavior and kinetic mechanism were *** results show that there exists two stages during sintering process,namely significant densification process at low temperature(1300-1700℃)and grain growth stage at high temperature(1700-2000℃).Finally,bulk tungsten material with the relative density of 96.9%and average grain size of 2-6μm was prepared at 1900℃.Moreover,electron backscatter diffraction results show the grain size is uniform and *** mathematical calculation,the nanocrystallization of tungsten powder significantly reduces the sintering activation energy and promotes the densification of tungsten powder at low *** diffusion is the main transport mechanism in grain growth *** is easy to find that the hardness of material increased with the sintering temperature increasing,at the end of sintering densification(>1700℃),TEM observation revealed that the inner pores formed by particle combine were gradually eliminated through grain boundary diffusion with the sintering temperature increasing,resulting in the intra-crystal densification to increase the hardness of tungsten material.

关键词： Nano-tungsten powder Sintering densification Electron backscatter diffraction Kinetics Nanoindentation hardness

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Kangfuxin solution alleviates esophageal stenosis after endoscopic submucosal dissection:A natural ingredient strategy

引用

World Journal of Gastroenterology 2025年第1期31卷 110-125页

作者： Xin Zhou Dan Ma Yi-Xiang He jing Jin Hong-lian Wang Yun-Feng Wang fan Yang Jian-Qin Liu Jie Chen Zhi Li Department of Spleen and Stomach Diseases the Affiliated Traditional Chinese Medicine HospitalSouthwest Medical UniversityLuzhou 646000Sichuan ProvinceChina The Key Laboratory of Integrated Traditional Chinese and Western Medicine for Prevention and Treatment of Digestive System Diseases of Luzhou City The Affiliated Traditional Medicine HospitalSouthwest Medical UniversityLuzhou 646000Sichuan ProvinceChina Department of Gastroenterology Changhai HospitalNaval Medical UniversityShanghai 20082China Research Center of Integrated Chinese and Western Medicine The Affiliated Traditional Chinese Medicine HospitalSouthwest Medical UniversityLuzhou 646000Sichuan ProvinceChina School of Integrated Traditional Chinese and Western Clinical Medicine North Sichuan Medical CollegeNanchong637100Sichuan ProvinceChina

BACKGROUND Esophageal stricture ranks among the most significant complications following endoscopic submucosal dissection(ESD).Excessive fibrotic repair is a typical pathological feature leading to stenosis after *** To examine the effectiveness and underlying mechanism of Kangfuxin solution(KFX)in mitigating excessive fibrotic repair of the esophagus *** Pigs received KFX at 0.74 mL/kg/d for 21 days after esophageal full circumferential *** examinations occurred on days 7 and 21 *** vitro,recombinant transforming growth factor(TGF)-β1(5 ng/mL)induced a fibrotic microenvironment in primary esophageal fibroblasts(pEsF).After 24 hours of KFX treatment(at 1.5%,1%,and 0.5%),expression ofα-smooth muscle actin-2(ACTA2),fibronectin(FN),and type collagen I was *** signaling was analyzed,including TGF-β1,Smad2/3,and phosphor-smad2/3(p-Smad2/3).RESULTS Compared to the Control group,the groups treated with KFX and prednisolone exhibited reduced esophageal stenosis,lower weight loss rates,and improved food tolerance 21 d after *** treatment,Masson staining revealed thinner and less dense collagen fibers in the submucosal ***,the expression of fibrotic effector molecules was notably ***,KFX downregulated the transduction levels of fibrotic functional molecules such as TGF-β1,Smad2/3,and p-Smad2/*** vitro,pEsF exposed to TGF-β1-induced fibrotic microenvironment displayed increased fibrotic activity,which was reversed by KFX treatment,leading to reduced activation of ACTA2,FN,and collagen *** 1.5%KFX treatment group showed decreased expression of p-Smad 2/3 in TGF-β1-activated *** KFX showed promise as a therapeutic option for post-full circumferential esophageal ESD strictures,potentially by suppressing fibroblast fibrotic activity through modulation of the TGF-β1/Smads signaling pathway.

关键词： Kangfuxin solution Natural component Endoscopic submucosal dissection Esophagus stricture Fibrosis

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

骨质疏松肾阳虚和肾阴虚证型下左归丸含药血清干预成骨细胞ERK1/2,Wnt/β-catenin信号通路的研究

引用

中国中药杂志 2017年第20期42卷 3983-3989页

作者：章建华邢婧范连霞尹华浙江中医药大学附属第一医院浙江杭州310006 浙江中医药大学药学院中药标准化研究实验室浙江杭州310053

该文研究骨质疏松(OP)肾阳虚和肾阴虚证型下左归丸含药血清对成骨细胞增殖和碱性磷酸酶(ALP)表达及对成骨细胞ERK1/2,Wnt/β-catenin信号通路相关因子β-catenin,ERK1,ERK2 mRNA及蛋白表达的作用。采用手术去卵巢法造成大鼠骨质疏松模型... 详细信息

该文研究骨质疏松(OP)肾阳虚和肾阴虚证型下左归丸含药血清对成骨细胞增殖和碱性磷酸酶(ALP)表达及对成骨细胞ERK1/2,Wnt/β-catenin信号通路相关因子β-catenin,ERK1,ERK2 mRNA及蛋白表达的作用。采用手术去卵巢法造成大鼠骨质疏松模型,并在手术10周后,分别注射氢化可的松、灌胃甲状腺素造成大鼠OP肾阳虚及OP肾阴虚模型;用新生24h乳鼠颅骨体外培养得成骨细胞,以碱性磷酸酶和茜素红染色进行鉴定,分别用OP肾阳虚、OP肾阴虚及OP组(对照组)所得的左归丸含药血清、空白血清干预成骨细胞,采用MTS法检测细胞增殖情况,ELISA法检测ALP表达,RT-PCR法检测ERK1/2,β-catenin mRNA的表达,Western blot法检测ERK1/2,β-catenin蛋白表达。结果表明:OP肾阴虚证型下左归丸含药血清在促进成骨细胞增殖、ALP表达、成骨细胞ERK1/2,Wnt/β-catenin信号通路相关因子β-catenin,ERK1,ERK2 mRNA及蛋白表达方面比OP肾阳虚证型下左归丸含药血清的作用更强。这与"左归丸滋肾阴"的中医理论相吻合,为临床辩证治疗骨质疏松症提供科学依据。左归丸通过ERK1/2和Wnt/β-catenin信号通路调控成骨细胞的增殖与分化,可能是左归丸防治骨质疏松肾阴虚证的机制之一。

关键词：左归丸成骨细胞含药血清骨质疏松肾阳虚骨质疏松肾阴虚 Wnt/β-catenin信号通路 ERK1/2信号通路

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

表面活性剂添加对超细98W-1Ni-1Fe粉末注射成形喂料流变行为的影响(英文)

引用

中国有色金属学会会刊：英文版 2013年第6期23卷 1709-1717页

作者：范景莲韩勇刘涛成会朝高扬田家敏中南大学粉末冶金国家重点实验室长沙410083

研究超细98W-1Ni-1Fe粉末的注射成形。系统研究球磨和硬脂酸(SA)添加对粉末特性以及喂料流变行为的影响。结果表明:球磨和SA添加均有效提高喂料的装载量。SA添加可以避免喂料制备过程中粉末与粘结剂间的表面反应,从而缩短混炼时间。SA... 详细信息

研究超细98W-1Ni-1Fe粉末的注射成形。系统研究球磨和硬脂酸(SA)添加对粉末特性以及喂料流变行为的影响。结果表明:球磨和SA添加均有效提高喂料的装载量。SA添加可以避免喂料制备过程中粉末与粘结剂间的表面反应,从而缩短混炼时间。SA添加可以降低喂料的粘度,但这种效果随温度升高而逐渐消失,在125℃以上时变为一种不利的效果。SA添加可以降低注射所需的温度。添加SA的粉末喂料在115℃时具有最低的粘度及剪切敏感性,而未加SA的粉末喂料在135℃时才具有最低的粘度及剪切敏感性。同时,添加SA的粉末喂料相比未添加SA的粉末喂料具有较低的温度敏感性及较佳的综合流变性能,因此,更适合于超细98W-1Ni-1Fe粉末的注射成形。

关键词：超细98W-1Ni-1Fe粉末球磨硬脂酸添加注射成形流变行为

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Dynamic Regulation of Hydrogen Bonding Networks and Solvation Structures for Synergistic Solar‑Thermal Desalination of Seawater and Catalytic Degradation of Organic Pollutants

引用

Nano-Micro Letters 2025年第2期17卷 548-565页

作者： Ming‑Yuan Yu jing Wu Guang Yin fan‑Zhen Jiao Zhong‑Zhen Yu Jin Qu Beijing Key Laboratory of Advanced Functional Polymer Composites Beijing University of Chemical TechnologyBeijing 100029People’s Republic of China State Key Laboratory of Organic‑Inorganic Composites College of Materials Science and EngineeringBeijing University of Chemical TechnologyBeijing 100029People’s Republic of China

Although solar steam generation strategy is efficient in desalinating seawater,it is still challenging to achieve continuous solar-thermal desalination of seawater and catalytic degradation of organic ***,dynamic regulations of hydrogen bonding networks and solvation structures are realized by designing an asymmetric bilayer membrane consisting of a bacterial cellulose/carbon nanotube/Co_(2)(OH)_(2)CO_(3)nanorod top layer and a bacterial cellulose/Co_(2)(OH)_(2)CO_(3)nanorod(BCH)bottom ***,the hydrogen bonding networks inside the membrane can be tuned by the rich surface–OH groups of the bacterial cellulose and Co_(2)(OH)_(2)CO_(3)as well as the ions and radicals in situ generated during the catalysis ***,both SO_(4)^(2−)and HSO_(5)−can regulate the solvation structure of Na^(+)and be adsorbed more preferentially on the evaporation surface than Cl^(−),thus hindering the de-solvation of the solvated Na^(+)and subsequent nucleation/growth of ***,the heat generated by the solar-thermal energy conversion can accelerate the reaction kinetics and enhance the catalytic degradation *** work provides a flow-bed water purification system with an asymmetric solar-thermal and catalytic membrane for synergistic solar thermal desalination of seawater/brine and catalytic degradation of organic pollutants.

关键词： Solar steam generation Seawater desalination Catalytic degradation Bacterial cellulose Cobalt hydroxycarbonate nanorods

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Computed tomography enterography-based radiomics for assessing mucosal healing in patients with small bowel Crohn's disease

引用

World Journal of Gastroenterology 2025年第3期31卷 62-72页

作者： Hao Ding Yuan-Yuan fang Wen-Jie fan Chen-Yu Zhang Shao-Fei Wang jing Hu Wei Han Qiao Mei Department of Gastroenterology The First Affiliated Hospital of Anhui Medical UniversityHefei 230022Anhui ProvinceChina Department of Radiation Oncology The First Affiliated Hospital of Anhui Medical UniversityHefei 230022Anhui ProvinceChina Department of Gastroenterology Suzhou First People's HospitalSuzhou 234099Anhui ProvinceChina

BACKGROUND Mucosal healing(MH)is the major therapeutic target for Crohn's disease(CD).As the most commonly involved intestinal segment,small bowel(SB)assessment is crucial for CD ***,it poses a significant challenge due to its limited accessibility through conventional endoscopic *** To establish a noninvasive radiomic model based on computed tomography enterography(CTE)for MH assessment in SBCD *** Seventy-three patients diagnosed with SBCD were included and divided into a training cohort(n=55)and a test cohort(n=18).Radiomic features were obtained from CTE images to establish a radiomic *** demographics were analysed to establish a clinical model.A radiomic-clinical nomogram was constructed by combining significant clinical and radiomic *** diagnostic efficacy and clinical benefit were evaluated via receiver operating characteristic(ROC)curve analysis and decision curve analysis(DCA),*** Of the 73 patients enrolled,25 patients achieved *** radiomic-clinical nomogram had an area under the ROC curve of 0.961(95%confidence interval:0.886-1.000)in the training cohort and 0.958(0.877-1.000)in the test cohort and provided superior clinical benefit to either the clinical or radiomic models alone,as demonstrated by *** These results indicate that the CTE-based radiomic-clinical nomogram is a promising imaging biomarker for MH and serves as a potential noninvasive alternative to enteroscopy for MH assessment in SBCD patients.

关键词： Crohn’s disease Computed tomography enterography Mucosal healing Nomogram Radiomics

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Soluble epoxide hydrolase:a next-generation drug target for Alzheimer's disease and related dementias

引用

Neural Regeneration Research 2025年第9期20卷 2585-2586页

作者： Andrew Gregory Chengyun Tang fan fan Department of Physiology Medical College of GeorgiaAugusta UniversityAugustaGAUSA

Alzheimer's disease(AD)and Alzheimer's diseaserelated dementias(ADRD)represent a significant public health challenge,with projections indicating a substantial increase in affected individuals due to the aging global *** the World Health Organization,AD/ADRD has affected more than 55 million individuals worldwide,with an additional 10 million cases diagnosed each year.

关键词： Alzheimer population drug

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Pharmacological targeting cGAS/STING/NF-κB axis by tryptanthrin induces microglia polarization toward M2 phenotype and promotes functional recovery in a mouse model of spinal cord injury

引用

Neural Regeneration Research 2025年第11期20卷 3287-3301页

作者： Ziwei fan Mengxian Jia Jian Zhou Zhoule Zhu Yumin Wu Xiaowu Lin Yiming Qian Jiashu lian Xin Hua Jianhong Dong Zheyu fang Yuqing Liu Sibing Chen Xiumin Xue Juanqing Yue Minyu Zhu Ying Wang Zhihui Huang Honglin Teng Department of Orthopedics(Spine Surgery) the First Affiliated Hospital of Wenzhou Medical UniversityWenzhouZhejiang ProvinceChina School of Pharmacy Hangzhou Normal UniversityHangzhouZhejiang ProvinceChina Department of Neurology The First Affiliated Hospital of Wenzhou Medical UniversityWenzhouZhejiang ProvinceChina Department of Pathology Affiliated Hangzhou First People’s HospitalSchool of MedicineWestlake UniversityHangzhouZhejiang ProvinceChina Department of Clinical Research Center Affiliated Hangzhou First People’s HospitalSchool of MedicineWestlake UniversityHangzhouZhejiang ProvinceChina

The M1/M2 phenotypic shift of microglia after spinal cord injury plays an important role in the regulation of neuroinflammation during the secondary injury phase of spinal cord *** of shifting microglia polarization from M1(neurotoxic and proinflammatory type)to M2(neuroprotective and anti-inflammatory type)after spinal cord injury appears to be *** possesses an anti-inflammatory biological ***,its roles and the underlying molecular mechanisms in spinal cord injury remain *** this study,we found that tryptanthrin inhibited microglia-derived inflammation by promoting polarization to the M2 phenotype in *** promoted M2 polarization through inactivating the cGAS/STING/NF-κB ***,we found that targeting the cGAS/STING/NF-κB pathway with tryptanthrin shifted microglia from the M1 to M2 phenotype after spinal cord injury,inhibited neuronal loss,and promoted tissue repair and functional recovery in a mouse model of spinal cord ***,using a conditional co-culture system,we found that microglia treated with tryptanthrin suppressed endoplasmic reticulum stress-related neuronal *** together,these results suggest that by targeting the cGAS/STING/NF-κB axis,tryptanthrin attenuates microglia-derived neuroinflammation and promotes functional recovery after spinal cord injury through shifting microglia polarization to the M2 phenotype.

关键词： cGAS/STING functional recovery microglia neuroinflammation neuroprotection nuclear factor-κB polarization spinal cord injury tryptanthrin

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Cloning and RNA interference analysis of the salivary protein C002 gene in Schizaphis graminum

引用

Journal of Integrative Agriculture 2015年第4期14卷 698-705页

作者： ZHANG Yong fan Jia SUN jing-rui CHEN Ju-lian State Key Laboratory for Biology of Plant Diseases and Insect Pests Institute of Plant ProtectionChinese Academy of Agricultural Sciences

The full-length c DNA of functionally-unknown salivary protein C002 in Schizaphis graminum was cloned using rapid amplification of c DNA ends（RACE） and designated as Sg C002（Gen Bank accession no. KC977563）. It is 767 bp long and encodes a protein of 190 amino acid residues with a predicted mass of 21.5 k Da and a predicted cleavage site of N-terminal signal peptide between the 24 th and the 25 th residues. Sg C002 is specifically expressed in salivary gland with the highest level at the 2nd instar. Introducing Sg C002-specific 476-si RNA, but not 546-si RNA to aphids through artificial diet significantly suppressed Sg C002 expression. Silencing Sg C002 gene led to lethality of the aphid on wheat plants, but not on pure artificial diet. Our study demonstrated that artificial diet-mediated RNAi can be a useful tool for research on the roles of genes in aphid salivary gland, and also provided new insights into the characteristics of C002 in wheat aphids.

关键词： Schizaphis graminum salivary protein C002 c DNA clone si RNA

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A Belief-Dependent Utility Model

引用

Acta Mathematicae Applicatae Sinica 2021年第4期37卷 682-696页

作者： Yu-lian fan North China University of Technology Beijing100144China

This paper proposes a belief-dependent utility function(BDU).The BDU is based on the fact that the beliefs of acts have inconsistent impacts on *** existence and uniqueness result of the BDU function is *** is then proved that the BDU function can provide risk attitude analysis and general comparative analysis as powerful as those presented by the classical expected utility theories.

关键词： belief utility function risk aversion

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：