检索结果-南通市图书馆

Effects of dealloying and heat treatment parameters on microstructures of nanoporous Pd

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2020年第13期47卷 123-129页

作者： Y.Z.Chen X.Y.Ma W.X.Zhang H.Dong g.b.shan Y.b.Cong C.Li C.L.Yang F.Liu State Key Lab.of Solidification Processing Northwestern Polytechnical University710072 Xi’anChina

Microstructures of nanoporous Pd are essentially important for its physical and chemical *** this work,we show that the microstructures of nanoporous Pd can be tuned by adjusting compositions of the precursor alloys,and dealloying and heat treatment *** the ligament and pore sizes decrease with increasing the electrochemical potential upon dealloying and the concentration of noble component in the precursor *** treatment causes coarsening of the nanoporous *** a critical temperature,the nanoporous structures are subjected to significant *** the critical temperature,surface diffusion is believed to dominate the coarsening *** the critical temperature,the nanoporous structure coarsens remarkably at a rather high rate,which is ascribed to a multiple-mechanism controlled process.

关键词： Nanoporous metals Microstructure Dealloying Kinetics Coarsening

Mechanisms of eutectic lamellar destabilization upon rapid solidification of an undercooled Ag-39.9 at.% Cu eutectic alloy

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2020年第24期59卷 173-179页

作者： H.Dong Y.Z.Chen Z.R.Zhang g.b.shan W.X.Zhang F.Liu State Key Lab.of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China Yangtze River Delta Research Institute of NPU Taicang 215400China

The eutectic Ag-Cu alloys exhibiting fine Ag-Cu lamellar eutectic structure formed upon rapid solidification have great potentials being used in various engineering ***,the desired fine primary lamellar eutectic structure(PLES)is usually replaced by a coarse anomalous eutectic structure(AES)when the undercooling prior to solidification exceeds a certain *** forming mechanism of AES in the undercooled eutectic Ag-Cu alloy has been a controversial *** this work,the undercooled Ag-39.9 at.% Cu eutectic alloy is solidified under different cooling conditions by using techniques of melt fluxing and copper mold *** results show that the coupled eutectic growth of this alloy undergoes a transition from a slow eutectic-cellular growth(ECg)to a rapid eutectic-dendritic growth(EDg)above a undercooling of 72 K,accompanying with an abrupt change of the distribution and amount of AES in as-solidified *** kinds of primary lamellar eutectic structures are formed by ECg and EDg during recalescence,*** destabilization of PLES that causes the formation of AES is ascribed to two different mechanisms based on the microstructural examination and theoretical *** 72 K,the destabilization of PLES formed by slow ECg is caused by the mechanism of"termination migration"driven by interfacial *** above 72 K,the destabilization of PLES formed by rapid EDg is attributed to the unstable perturbation of interface driven by interfacial energy and solute supersaturation.

关键词： Ag-Cu alloys Rapid solidification Undercooling Eutectics Destabilization

Maternal and fetal death associated with acute pancreatitis during pregnancy:A case report

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2025年第10期13卷 53-58页

作者： Jin Li Qing-Yan Zhang Mei-Hong Zhang shan-Yun Jiang Department of Anesthesiology Kaihua County People’s HospitalQuzhou 324300Zhejiang ProvinceChina Center for Clinical Inspection and Quarantine Kaihua County Center for Clinical Inspection and QuarantineQuzhou 324300Zhejiang ProvinceChina

bACKgROUND Acute pancreatitis in pregnancy is a rare but serious condition that can lead to high maternal mortality and fetal *** of pregnancy complicated by severe acute pancreatitis,particularly with subsequent respiratory and cardiac arrest,are rarely *** SUMMARY We present the case of a 35-year-old woman,at 36+5 weeks of gestation,who presented with paroxysmal epigastric pain accompanied by low back pain,nausea,and *** to the clinical symptoms,b-ultrasound imaging and biochemical indicators,the patient was diagnosed with acute pancreatitis and initially managed ***,3 hours after admission,the patient experienced respiratory and cardiac arrest,and the fetus *** this case,the adverse outcomes occurred due to the lack of aggressive fluid resuscitation and an active surgical *** Implementing aggressive fluid resuscitation to sustain tissue perfusion,alongside the proactive evaluation of pharmacological agents that suppress gastric acid secretion and inhibit pancreatic enzyme activity,may be beneficial in mitigating the risk of a severely adverse *** management of acute pancreatitis during pregnancy requires careful timing of surgical intervention,a thorough evaluation of the risks and benefits regarding the continuation or termination of pregnancy,and a focus on safeguarding both maternal and fetal health.

关键词： Severe acute pancreatitis Pregnancy Cardiac arrest Fetal death Case report

Antiviral therapy for hepatitis b virus infection is beneficial for the prognosis hepatocellular carcinoma

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 Oncology 2025年第1期17卷 1-9页

作者： Hui Wan Yu-Xin Zhang guan-Yue shan Jun-Ya Cheng Duan-Rui Qiao Yi-Ying Liu Wen-Na Shi Hai-Jun Li Institute of Translational Medicine The First Hospital of Jilin UniversityChangchun 130061Jilin ProvinceChina Department of bioengineering Pharmacy School of Jilin UniversityChangchun 130061Jilin ProvinceChina Institute of Liver Diseases Institute of Translational MedicineThe First Hospital of Jilin UniversityChangchun 130061Jilin ProvinceChina

In this editorial,we comment on the article by Mu et al,published in the recent issue of the World Journal of gastrointestinal *** pay special attention to the immune tolerance mechanism caused by hepatitis b virus(HbV)infection,the pathogenesis of hepatocellular carcinoma(HCC),and the role of antiviral therapy in treating HCC related to HbV *** infection leads to systemic innate immune tolerance by directly inhibiting pattern recognition receptor recognition and antiviral signaling pathways,as well as by inhibiting the immune functions of macrophages,natural killer cells and dendritic *** addition,HbV leads to an immunosuppressive cascade by expressing inhibitory molecules to induce exhaustion of HbV-specific cluster of differentiation 8+T cells,ultimately leading to long-term viral *** loss of immune cell function caused by HbV infection ultimately leads to ***-term antiviral therapy can improve the prognosis of patients with HCC and prevent tumor recurrence and metastasis.

关键词： Hepatitis b virus Hepatocellular carcinoma Hepatitis b virus-DNA Immune tolerance Antiviral therapy

Detrital zircon geochronology of quartzites from the southern Madurai block,India:Implications for gondwana reconstruction

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

geoscience Frontiers 2017年第4期8卷 851-867页

作者： shan-shan Li M.Santosh g.Indu E.Shaji T.Tsunogae School of Earth Sciences and Resources China University of Geosciences Beijing Department of Earth Sciences University of Adelaide Department of geology University of KeralaKariyavattom Campus graduate School of Life and Environmental Sciences University of Tsukuba Department of geology University of Johannesburg

Detrital zircons are important proxies for crustal provenance and have been widely used in tracing source characteristics and continental *** Peninsular India constituted the central segment of the late Neoproterozoic supercontinent gondwana and is composed of crustal blocks ranging in age from Mesoarchean to late *** we investigate detrital zircon grains from a suite of quartzites accreted along the southern part of the Madura） *** LA-ICPMS U-Pb dating reveals multiple populations of magmatic zircons,among which the oldest group ranges in age from Mesoarchean to Paleoproterozoic（ca.2980-1670 Ma,with peaks at 2900-2800 Ma,2700-2600 Ma,2500-2300 Ma,2100-2000 Ma）.Zircons in two samples show magmatic zircons with dominantly Neoproterozoic（950-550 Ma） *** metamorphic zircons from the quartzites define ages in the range of 580-500 Ma,correlating with the timing of metamorphism reported from the adjacent Trivandrum block as well as from other adjacent crustal fragments within the gondwana *** zircon trace element data are mostly characterized by LREE depletion and HREE enrichment,positive Ce,Sm anomalies and negative Eu,Pr,Nd *** Mesoarchean to Neoproterozoic age range and the contrasting petrogenetic features as indicated from zircon chemistry suggest that the detritus were sourced from multiple provenances involving a range of lithologies of varying *** the exposed basement of the southern Madurai block is largely composed of Neoproterozoic orthogneisses,the data presented in our study indicate derivation of the detritus from distal source regions implying an open ocean *** carrying exclusive Neoproterozoic detrital zircon population in the absence of older zircons suggest proximal sources in the southern Madurai *** results suggest that a branch of the Mozambique ocean might have separated the southern Madurai block to the north and the Nagercoil block to the south,

关键词： U-Pb geochronology Detrital zircon Southern Madurai block gondwana supercontinent

The thermal instability mechanism and annealed deformation behavior of Cu/Nb nanolaminate composites

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2023年第26期157卷 163-173页

作者： Chaogang Ding Jie Xu Debin shan bin guo Terence g.Langdon Key Laboratory of Micro-systems and Micro-structures Manufacturing of Ministry of Education Harbin Institute of TechnologyHarbin 150080China National Key Laboratory for Precision Hot Processing of Metals Harbin Institute of TechnologyHarbin 150001China Materials Research group Department of Mechanical EngineeringUniversity of SouthamptonSouthampton SO171BJUK

Nanoscale metallic multilayers(NMMs)have attracted significant attention owing to their enhanced me-chanical properties and excellent thermal ***,the underlying deformation mechanisms of the high-temperature annealed microstructures have not been well *** this study,the effect of annealing temperatures(500,600,700,800,and 1000℃)on the microstructural evolution and mechan-ical properties of Cu/Nb NMMs was investigated *** results show that when the anneal-ing temperature is lower than 800℃the Cu/Nb NMMs maintain their initial continuous nanolayered *** the annealing temperature reaches 1000℃,a thermal instability,driven by thermal grain boundary grooving and a Rayleigh instability,leads to the pinching offof the nanolayered structure and even a complete disintegration into an equiaxed grain *** tensile tests show that 1000℃annealed samples exhibit an enhanced strain hardening capability compared to as-rolled NMMs and this imparts superior ultimate tensile strength(∼492 MPa)and a high elongation(∼20%).TEM observations demonstrate that high-density entangled dislocations exist in the Cu-Nb interface and layers after tensile testing of the high-temperature annealed *** dislocation tangles lead to stable and progres-sive strain hardening which is the dominant factor in determining the superior combination of strength and ductility of the high-temperature annealed ***,this study offers a promising strategy for evading the strength-ductility dilemma and instead promotes a more in-depth understanding of the de-formation mechanisms of heterostructured materials.

关键词： Annealing Interfaces Mechanical properties Nanoscale metallic multilayers Thermal stability

Mass spectrometry-based phosphoproteomics in cancer research

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers in biology 2012年第6期7卷 566-586页

作者： Xiao-shan YUE Amanda b. HUMMON Department of Chemistry and biochemistry University of Notre Dame Notre Dame IN 46556 USA

Phosphorylation is one of the most common post translational modifications （PTM）, participating in a large number of processes to regulate cellular functions. Phosphorylation is also one of the key factors in the origin and development of cancer. The rapid development of mass spectrometric-based phosphoproteomic technologies has made it possible for high-throughput identification and quantification of phosphorylation events. In this review, we provide a general introduction and summary of the achievements made in mass spectrometry based phosphoproteomic research, including the approaches for phosphopeptide identification and quantification, as well as instrumentation and data interpretation methods. We also review some discoveries in cancer research made possible by phosphoproteomic analysis technologies.

关键词： phosphoproteomics mass spectrometry cancer research phosphopeptide enrichment quantitative phosphoproteomics data interpretation

Augmentation Quotients for Complex Representation Rings of generalized Quaternion groups

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Annals of Mathematics,Series b 2016年第4期37卷 571-584页

作者： shan CHANg School of Mathematics Hefei University of Technology

Abstract Denote by Qm the generalized quaternion group of order 4m. Let R（Qm） be its complex representation ring, and △（Qm） its augmentation ideal. In this paper, the author gives an explicit Z-basis for the △n... 详细信息

关键词： generalized quaternion groups Representation ring Augmentation quotients

Homoclinic Orbits for First Order Hamiltonian Systems with Some Twist Conditions

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2015年第11期31卷 1725-1738页

作者： Yuan shan School of Mathematics and Statistics Nanjing Audit University

In this paper, we study the nonperiodic first-order Hamiltonian system u = JL（t）u ＋ JH＇（t,u）, where HεCl（RxR2n）. With some assumptions on L, the corresponding Hamiltonianoperator has only discrete spectrum. by using the index theory for self-adjoint operator equation, we establish the existence of multiple homoclinic orbits for the asymptotically quadratic nonlinearty satisfying some twist conditions between infinity and origin.

关键词： Homoclinic solutions first order Hamiltonian system index theory twist conditions