检索结果-南通市图书馆

Effects of Heat Treatment Process Parameters on Microstructure and Mechanical Properties of DP440Cold Rolled Strip

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2014年第5期21卷 509-516页

作者： Gang HUO Yi-ming CEN Zhen-xing li guo-dong li Chang-sheng li State Key Laboratory of Rolling and Automation Northeastern University Pohang Cold Strip Rolling Co. Ltd.

In order to optimize the production process, improve the production efficiency and accelerate the development and application of the domestic dual-phase steel, the effects of heat treatment process parameters on microstructure and mechanical properties of DP440 cold rolled strip were studied by the CAS-300 simulated continuous annealing equipment. When the heating rate increased from 5 to 100 ℃/s, both the tensile strength and yield strength increased because of the decreased grain size. When the intercritical annealing temperature increased from 780 to 850 ℃, the martensite content decreased so that the tensile strength decreased first, then increased, and the yield strength increased. When the rapid cooling rate increased from 25 to 100 ℃/s, because the martensite content increased, the tensile strength increased, while the yield strength decreased. When the overaging temperature increased from 260 to 400 ℃, the tensile strength decreased, while the yield strength increased. When the overaging time increased from 240 to 480 s, the tensile strength decreased a little, while the yield strength increased a little.

关键词： dual-phase steel heat treatment microstructure mechanical property

Efficient acidic oxygen evolution reaction electrocatalyzed by iridium-based 12L-perovskites comprising trinuclear face-shared IrO6 octahedral strings

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2020年第8期29卷 291-298,I0010页

作者： Ruiqin Gao Qi Zhang Hui Chen Xuefeng Chu guo-dong li Xiaoxin Zou State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of ChemistryJilin UniversityChangchun 130012JilinChina Key Laboratory of Architectural Cold Climate Energy Management Ministry of EducationJilin Jianzhu UniversityChangchun 130118JilinChina

Development of cost-effective and highly active oxygen evolution catalysts operating well in acidic media is a critical challenge in proton exchange membrane water ***,we present a class of iridium-based 12L-perovskites(Ba4MIr3O12;M=Pr,Bi,Nb)as novel low-iridium electrocatalysts for oxygen evolution reaction under acidic *** 12L-perovskites contain trinuclear face-shared Ir O6octahedral strings—unique subunits that are not found in the previously-reported iridium-based *** catalytic activities of 12L-perovskites(Ba4MIr3O12)are found to be related to the location of O 2p-band center,which is influenced by the B-site nonprecious element(i.e.,Pr,Bi or Nb).Our experimental results show that Ba4PrIr3O12is the most active electrocatalyst among the materials we synthesize,and contains 55%less iridium than the benchmark catalyst IrO2,while exhibiting higher catalytic *** the presence of Ba4PrIr3O12,transient leaching process of Ba and Pr takes place during electrochemical process,contributing to the surface reconstruction of the pristine *** experimental results reveal that the formation of under-coordinated Ir Ox-rich surface and easier generation of active intermediate IrVare mainly responsible for the good activity of Ba4PrIr3O12.

关键词： Eletrocatalysis Oxygen evolution reaction Iridium Perovskite

Generation of Four-Mode Cluster-Type Entangled Coherent States in Free-Traveling Optical Fields

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2011年第3期55卷 426-430页

作者： HE Dai-guo dong Yu-li FANG Jian-Xing QIAN li HU Jie School of Physical Science and Technology Suzhou University Suzhou 215006 China

In this paper, we propose an optical scheme to generate four-mode cluster-type entangled coherent states （ECSs） in free traveling optical fields by using two single-photon sources, coherent state sources, beam splitters, pho- todetectors, cross-Kerr media, and phase shifters. And the success probability of the states preparation is calculated. At last we discuss the experimental feasibility of such proposal.

关键词： cluster states coherent states beam splitters cross-Kerr media

Tunable hydrogen coverage on electron-deficient platinum nanoparticles for efficient hydrogenation reactions

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2023年第7期16卷 8751-8756页

作者： Lu-Han Sun Qi-Yuan li Yu-Shuai Xu Si-Yuan Xia dong Xu Xiu lin Jingsan Xu Jie-Sheng Chen guo-dong li Xin-Hao li School of Chemistry and Chemical Engineering Frontiers Science Center for Transformative MoleculesShanghai Jiao Tong UniversityShanghai 200240China School of Chemistry and Physics Faculty of ScienceCentre for Materials ScienceQueensland University of TechnologyBrisbaneQLD 4001Australia State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of ChemistryJilin UniversityChangchun 130012China

Dissociation of active H species over the catalytic sites with the carbon-supported Pt metals as the mainstream catalysts is crucial to facilitate hydrogen donation and accelerate the hydrogen addition process in catalytic hydrogenation systems to produce polymers,pharmaceuticals,agrochemicals,fragrances,and biofuels at million-ton *** attention has been paid to the design of the more active catalytic site to effectively adsorb and activate reactants and H_(2) *** the same time,there is still a huge room to develop powerful strategies to accelerate the donation of acted H species to the reactants from the Pt surface further to boost the final catalytic efficiencies of Pt catalysts and depress the total Pt ***,we present a new strategy for promoting the Pt-H bond dissociation by increasing surface hydrogen coverage on designed electron-deficient Pt *** electron deficiency of Pt nanoparticles has been successfully tuned by constructing a rectifying contact with an even“noble”boron-rich carbon support(Pt/BC).Theoretical and experimental results confirm the dominant role of the pronounced electron deficiencies of Pt nanoparticles in enhancing the H coverage for 2.3 times higher than that of neutral Pt nanoparticles,significantly boosting the Pt-H bond dissociation and thus the whole hydrogenation process as reflected by the extremely high turnover frequency(TOF)value of 388 h^(-1)at 30℃ and 10 bar H_(2) for phenol hydrogenation on the Pt/BC,outperforming the bench-marked catalysts by a factor of 9.

关键词： hydrogenation hydrogen coverage Schottky barrier heterogeneous catalysis

Clinical value of fecal calprotectin in determining disease activity of ulcerative colitis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2008年第1期14卷 53-57页

作者： Jun-Ying Xiang Qin Ouyang guo-dong li Nan-Ping Xiao Department of Gastroenterology West China Hospital Sichuan University Chengdu 610041 Sichuan Province China

AIM： To investigate possibility and clinical application of fecal calprotectin in determining disease activity of ulcerative colitis （UC）. METHODS： The enzyme-linked immunosorbent assay （EliSA） was used to measure the concentrations of calprotectin in feces obtained from 66 patients with UC and 20 controls. C-reactive protein （CRP）, erythrocyte sedimentation rate （ESR）, acid glycoprotein （AGP） were also measured and were compared with calprotectin in determining disease activity of UC. The disease activity of UC was also determined by the Sutherland criteria. RESULTS： The fecal calprotectin concentration in the patients with active UC was significantly higher than that in the inactive UC and in the controls （402.16 ± 48.0 μg/g vs 35.93 ± 3.39 μg/g, 11.5 ± 3.42 μg/g, P 〈 0.01）. The fecal calprotectin concentration in the inactive UC group was significantly higher than that in the control group （P 〈 0.05）. A significant difference was also found in the patients with active UC of mild, moderate and severe degrees. The area under the curve of the receiver operating characteristics （AUCR^c） was 0.975, 0.740, 0.692 and 0.737 for fecal calprotectin, CRP, ESR and AGP, respectively. There was a strong correlation between the fecal calprotectin concentration and the endoscopic gradings for UC （r = 0.866, P 〈 0.001）. CONCLUSION： Calprotectin in the patient＇s feces can reflect the disease activity of UC and can be used as a rational fecal marker for intestinal inflammation in clinical practice. This kind of marker is relatively precise, simple and noninvasive when compared with other commonlyused markers such as CRP, ESR and AGP.

关键词： Fecal calprotectin Disease activity Ulcerative colitis Enzyme-linked immunosorbent assay

New-style laparoscopic and endoscopic cooperative surgery for gastric stromal tumors

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2013年第16期19卷 2550-2554页

作者： Hai-Yan dong Yu-Long Wang Jie li Qiu-Ping Pang guo-dong li Xin-Yong Jia Department of Endoscopy Qianfoshan Hospital Affiliated to Shandong University Department of General Surgery Qianfoshan HospitalAffiliated to Shandong University

AIM: To evaluate the feasibility and safety of a new style of laparoscopic and endoscopic cooperative surgery (LECS), an improved method of laparoscopic intragastric surgery (liGS) for the treatment of gastric stromal tumors (GSTs). METHODS: Six patients were treated with the newstyle LECS. Surgery was performed according to the following procedures: (1) Exposing and confirming the location of the tumor with gastroscopy; (2) A laparoscopy light was placed in the cavity using the trocar at the navel, and the other two trocars penetrated both the abdominal and stomach walls; (3) With gastroscopy monitoring, the operation was carried out in the gastric lumen using laparoscopic instruments and the tumor was resected; and (4) The tumor tissue was removed orally using a gastroscopy basket, and puncture holes and perforations were sutured using titanium clips. RESULTS: Tumor size ranged from 2.0 to 4.5 cm (average 3.50 ± 0.84 cm). The operative time ranged from 60 to 130 min (average 83.33 ± 26.58 min). Blood loss was less than 20 mL and hospital stay ranged from 6 to 8 d (average 6.67 ± 0.82 d). The patients were allowed out of bed 12 h later. A stomach tube was inserted for 72 h after surgery, and a liquid diet was then taken. All cases had single tumors which were completely resected using the new-style LECS. No postoperative complications occurred. Pathology of all resected specimens showed GST: no cases of implantation or metastasis were ***: New-style LECS for GSTs is a quick, optimized, fast recovery, safe and effective therapy.

关键词： Laparoscopic and endoscopic cooperative surgery Gastric stromal tumor

Comparative chloroplast genome analysis of medicinally important Veratrum(Melanthiaceae)in China:Insights into genomic characterization and phylogenetic relationships

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Plant Diversity 2022年第1期44卷 70-82页

作者： Ying-Min Zhang li-Jun Han Cong-Wei Yang Zi-li Yin Xing Tian Zi-Gang Qan guo-dong li Faculty of Traditional Chinese Pharmacy Yunnan University of Chinese MedicineKunming 650500YunnanChina Yunnan Key Laboratory for Dai and Yi Medicines Yunnan University of Chinese MedicineKunming 650500YunnanChina

Members of Veratrum are perennial herbs widely used in traditional Chinese medicine to induce vomiting,resolve blood stasis and relieve ***,the intrageneric classification and phylogenetic relationships within Veratrum have long been controversial due to the complexity of morphological variations and lack of high-resolution molecular *** this study,we reevaluated the infrageneric relationships with the genus Veratrum using complete chloroplast genome sequence ***,the complete cp genomes of ten species of Veratrum were newly sequenced and *** complete cp genomes of ten species of Veratrum had the typical quadripartite structure,ranging from 151,597 bp to 153,711 bp in size and comprising a total of 135 *** structure of Veratrum cp genomes(i.e.,gene order,content,and genome components)was highly similar across *** number of simple sequence repeats(SSRs)ranged from 63 to 7&and of long repeats ranged from 31 to *** highly divergent regions(ndhF,psbC-psbZ,psbK-psbl,rpoB-tmCjGCA,tmK_UUU-tmQ_UUG,tmS_GCU-tmG_UCC,tmT_UGU-tmL_UAA and ycfl)were identified and are potentially useful for the DNA barcoding of *** analysis among 29 taxa based on cp genomes,total genes,protein-coding genes and intergenic regions strongly supported the monophyly of *** circumscription and relationships of the infrageneric taxa of Veratrum were well-presented with great *** results will facilitate the identification,taxonomy,and utilization of Veratrum plants as well as the evolutionary studies of Melanthiaceae.

关键词： Veratrum Melanthiaceae Chloroplast genome Comparative analysis Phylogeny

Air-core characteristics in a swirling tunnel flow

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2022年第4期34卷 634-646页

作者： Jun-hu Nan Huan Gao Chao-qun Wang Kang-ning Ma James Yang Jia-fang Wei guo-dong li State Key Laboratory of Eco-hydraulics in Northwest Arid Region Xi'an University of TechnologyXi'an 710048China College of Energy and Power Engineering Lanzhou University of TechnologyLanzhou 730050China Department of Civil and Architectural Engineering Royal Institute of Technology(KTH)StockholmSweden

A cost-effective technique to dissipate the energy in hydropower systems is the formation of a swirling flow within a *** such flows,an air core with a significant cross section usually *** reveal the air-core features in the horizontal tunnel of a high-head shaft spillway,laboratory tests,numerical modeling,and prototype observations are performed,to examine issues such as the formation of the air core,the interjacent air motion,the air-carrying capacity,and the scale *** is shown that the shape of the air core varies greatly in the axial and radial directions along the tunnel and that the center of the core deviates from the axis of the *** motion of the air within the core is caused by the combined action of the water entrainment on the inner surface of the swirling flow and the axial pressure difference in the air *** aeration process can be divided into five processes with respect to the changes of the gate openings.A theoretical expression is established for the air-carrying capacity of the swirling *** vacuum degree is the similarity condition of the air-carrying capacity of the swirling flow between the model and prototype tests based on the Froude law of the similitude,and this similarity condition is verified by both the model and prototype *** work provides a reference for the application of the swirling flows in horizontal hydropower tunnels.

关键词： Horizontal tunnel swirlingflow air core air-carrying capacity scale effect

Laparoscopic-assisted endoscopic full-thickness resection of a large gastric schwannoma: A case report

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastrointestinal Surgery 2022年第4期14卷 362-369页

作者： Cheng-Hai He Shi-Hua lin Zhen Chen Wei-Min li Chun-Yan Weng Yun guo guo-dong li Department of Gastroenterology The Affiliated Hospital of Hangzhou Normal UniversityHangzhou 310000Zhejiang ProvinceChina Department of Internal Medicine Zhejiang HospitalHangzhou 310000Zhejiang ProvinceChina Department of Pathology The Affiliated Hospital of Hangzhou Normal UniversityHangzhou 310000Zhejiang ProvinceChina Department of Gastroenterology The First Clinical Medical College of Zhejiang Chinese Medical UniversityHangzhou 310000Zhejiang ProvinceChina

BACKGROUND Schwannomas,also known as neurinomas,are benign tumors derived from Schwann *** schwannomas are rare and are most frequently reported in the *** are usually asymptomatic and are difficult to diagnose preoperatively;however,endoscopy and imaging modalities can provide beneficial preliminary diagnostic *** are various surgical options for ***,we present a case of a large gastric schwannoma(GS)managed by combined laparoscopic and endoscopic *** SUMMARY A 28-year-old woman presented with a 2-mo history of epigastric discomfort and a feeling of abdominal *** upper gastrointestinal endoscopy and endoscopic ultrasonography,a hypoechogenic submucosal mass was detected in the gastric antrum:It emerged from the muscularis propria and projected *** tomography showed a nodular lesion(4 cm×3.5 cm),which exhibited uniform enhancement,on the gastric antrum *** on these findings,a preliminary diagnosis of gastrointestinal stromal tumor was established,with schwannoma as a *** the large tumor size,we planned to perform endoscopic resection and to convert to laparoscopic treatment,if ***,the patient underwent combined laparoscopic and gastroscopic ***,the resected specimen showed positivity for S-100 and negativity for desmin,DOG-1,α-smooth muscle actin,CD34,CD117,and *** Ki-67 index was 3%,and a final diagnosis of GS was *** Combined laparoscopic and endoscopic surgery is a minimally invasive and effective treatment option for large GSs.

关键词： Gastric schwannoma Laparoscopy Gastroscopy Immunohistochemical staining Operation method Case report