检索结果-南通市图书馆

维普期刊数据库

time-resolved X-ray diffraction measurement of C60 under high pressure and temperature using synchrotron radiation

在线全文

学校读者我要写书评

暂无评论

Time-resolved X-ray diffraction measurement of C60 under hig...

Synthesis and luminescent properties of low oxygen contained Eu^(2+)-doped Ca-α-SiAlON phosphor from calcium cyanamide reduction

18th International Conference on High Pressure Science and technology

作者： t.horikawa K.Suito M.Kobayashi A.Onodera Graduate School of Engineering Science Osaka UniversityToyonakaOsaka 560-8531Japan University of Marketing and Distribution Sciences Nishi-kuKobe 651-2188Japan

Various high-pressure studies have been performedon fullerene(C)to investigate the effects of pressureto the fullerene *** example,very hardmaterials comparable to,or even harder than,diamondcan be produced[1,2,3].But the structure ormechanism of such materials are not yet *** these results have been all derived frompost-compression investigations,so in situ observationis required to know the structure and mechanism ofhard materials derived from fullerene in more detail. Powder C (99.9% purity,MER Co.)was used as astarting *** experiments the sample wasdried at 200℃ and 10 torr for 24 hrs to *** sample was packed into a tube made *** was used as a pressure *** hightemperature a pair of graphite discs was ***

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Journal of Rare Earths 2008年第2期26卷 198-202页

作者： PIAO Xianqing Ken-ichi Machida takashi horikawa Hiromasa Hanzawa Center for Advanced Science and Innovation Osaka University 2-1 Yamadaoka Suita

A new convenient calcium cyanamide （CaCN2） reduction route was developed to synthesize the Eu^2＋ activated Ca-α-SiAION phosphors containing low oxygen content. the luminescence properties of the obtained products were investigated for white LEDs application. the critical Eu^2＋ concentration in various hosts and its effect on the photoluminescence properties were studied. the optimized sample （10at.% Eu^2＋ vs. Ca^2＋） could be efficiently excited by the current GaN/InGaN blue LED chips and provided emission intensity competitive with that of YAG：Ce^3＋（P46-Y3） standard, revealing that this phosphor was a potential candidate for phosphor-converted white LEDs.

关键词： nitride phosphor white LEDs SiAION Eu^2+ CaCN2 rare earths

维普期刊数据库

transport mechanism in chemically reactive hybrid nanofluid flow containing gyrotactic micro-organisms over a curved oscillatory surface

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics and Mechanics(English Edition) 2025年第1期46卷 177-192页

作者： M.NAVEED M.IMRAN t.ASGHAR Z.ABBAS Department of Mathematics Division of Science and TechnologyUniversity of Education Department of Mathematics The Islamia University of Bahawalpur

this paper examines the transport analysis, including both heat transfer and mass transfer, in hybrid nanofluid flow containing gyrotactic microorganisms towards a curved oscillatory surface. the influence of magnetic fields is also inspected in terms of their physical characteristics. to depict the phenomena of transport, modified versions of both Fick's and Fourier's laws are used. Additionally, the characteristics of both heterogeneous and homogeneous chemical reactions are also incorporated. Utilizing a curvilinear coordinate system, the flow problem is formulated as partial differential equations(PDEs)for momentum, concentration, microorganism field, and energy. An analytical solution to the obtained flow equations is achieved utilizing the homotopy analysis method(HAM).the effects of significant flow parameters on the pressure and microorganism fields, velocity, oscillation velocity, concentration, and temperature distributions are shown via graphs. Furthermore, the variations in skin friction, mass transfer rate, heat transfer rate, and local motile number due to different involved parameters are presented in tables and are analyzed in detail. Graphical results indicate that the curves of velocity and temperature fields are enhanced as the values of the solid volume fraction variables *** is also verified that the concentration rate field decreases as the values of the homogeneous reaction strength parameter and the radius of curvature parameter increase, and it increases with the Schmidt number and the heterogeneous reaction strength *** outcomes show a favorable response of the motile number to advanced values of the Peclet number, the Schmidt number, the microorganism difference parameter, and the bio-convective Lewis number.

关键词：

Free vibration and transient response of double curved beams connected by intermediate straight beams

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Applied Mathematics and Mechanics(English Edition) 2025年第1期46卷 37-62页

作者： R.A.JAFARI-tALOOKOLAEI H.GHANDVAR E.JUMAEV S.KHAtIR t.CUONG-LE School of Mechanical Engineering Babol Noshirvani University of Technology Department of Mechanical Engineering Faculty of Engineering New Uzbekistan University University of Business and Science Center for Engineering Application and technology Solutions Ho Chi Minh City Open University

this paper investigates the free vibration and transient response of interconnected structures including double curved beams and intermediate straight beams,which are all constructed from functionally graded porous(FGP) materials. the strain potential and kinetic energies of each beam along with the work done by the external force are calculated. Additionally, a higher-order beam element is introduced to derive stiffness and mass matrices, along with the force vector. the curved and straight beams are discretized, and their assembled stiffness, mass matrices, and force vectors, are *** conditions at the joints are used to derive the total matrices of the entire structure. Subsequently, the natural frequencies and transient response of the system are determined. the accuracy of the mathematical model and the self-developed computer program is validated through the comparison of the obtained results with those of the existing literature and commercial software ANSYS, demonstrating excellent ***, a comprehensive study is conducted to investigate the effects of various parameters on the free vibration and transient response of the considered structure.

关键词：

Indian monsoon variability in the Mahanadi Basin over the last two glacial cycles and its implications on the Indonesian throughflow

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Geoscience Frontiers 2023年第1期14卷 215-229页

作者： Jongmin Lee Sunghan Kim Minoru Ikehara Keiji horikawa Yoshihiro Asahara Chan Min Yoo Boo-Keun Khim Department of Oceanography Pusan National UniversityBusan 46241South Korea Deep-sea Mineral Resources Research Center Korea Institute of Ocean Science&TechnologyBusan 49111South Korea Division of Glacial Environment Research Korea Polar Research InstituteIncheon 21990South Korea Center for Advanced Marine Research Kochi UniversityKochi 783-8502Japan Graduate School of Science and Engineering for Research University of ToyamaToyama 930-8555Japan Department of Earth and Planetary Sciences Nagoya UniversityNagoya 464-8601Japan

the orbital-scale variability of the Indian summer monsoon(ISM)has been influenced by multiple factors,such as atmospheric CO_(2)concentration,global ice volume,and *** for weathering activity and paleo-productivity provide potential insights into the driving forces of its *** documented multi-proxy data at IODP Site U1445,located in the Mahanadi Basin of the northwestern Bay of Bengal,to find out ISM variability over the last 200 *** proxy records,such as Nd/Sr isotopes of detrital particles,clay mineral compositions of the fine-grained sediments,biogenic opal and CaCO_(3),organic carbon contents,and carbon isotopes of organic matter,represent sediment sources,weathering patterns,and paleo-productivity related to the ISM *** Nd/Sr isotope data and clay mineral compositions suggest that the sediments at Site U1445 originated mainly from the Ganges,Brahmaputra,and Meghna rivers without dramatic provenance change between the glacial and interglacial *** weathering activity inferred from clay mineral compositions and the paleo-productivity shift reconstructed by biogenic opal and CaCO_(3)contents suggest that the land-sea interactions were closely linked to the ISM precipitation between the glacial and interglacial *** precipitation by the strong ISM resulted in intense chemical weathering and dominant biogenic opal deposition during the interglacial *** contrast,low precipitation by the weak ISM led to reduced chemical weathering and predominant CaCO_(3)deposition during the glacial ***,the ISM variability driving the land-sea interactions in the Mahanadi Basin was modulated by the Indonesian throughflow(ItF).Our study emphasizes the role of low-latitude forcing of climatic changes in the strong relationship between the ISM and ItF over orbital periods,providing a base for future investigations.

关键词： Provenance Weathering activity Paleo-productivity Indian summer monsoon Bay of Bengal Indonesian throughflow

Single-nucleotide polymorphisms in HORMAD1 may be a risk factor for azoospermia caused by meiotic arrest in Japanese patients

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian Journal of Andrology 2012年第4期14卷 580-583页

作者： toshinobu Miyamoto Aldra tsujimura Yasushi Miyagawa Eitetsu Koh Mikio Namiki Michiharu horikawa Yasuaki Saijo Kazuo Sengoku Department of Obstetrics and Gynecology Asahikawa Medical University Asahikawa Hokkaido 078-8510 Japan Department of Urology Osaka University Graduate School of Medicine Suita 565-0871 Japan Department of Integrated Cancer therapy and Urology Kanazawa University Graduate School of Medical Science Kanazawa 920-1192 Japan Division of Community Medicine and Epidemiology Department of Health Science Asahikawa Medical University Asahikawa 078-8510 Japan

Genetic mechanisms are implicated as a cause of some male infertility, yet are poorly understood. Meiosis is unique to germ cells and essential for reproduction. the synaptonemal complex is a critical component for chromosome pairing, segregation and recombination. Hormadl is essential for mammalian gametogenesis as knockout male mice are infertile. Hormadl-deficient testes exhibit meiotic arrest in the early pachytene stage and synaptonema! complexes cannot be visualized. to analyze the hypothesis that the human HORMAD1 gene defects are associated with human azoospermia caused by meiotic arrest, mutational analysis was performed in all coding regions by direct sequence analysis of 30 Japanese men diagnosed with azoospermia resulting from meiotic arrest. By the sequence analysis, three polymorphism sites, Single Nucleotide Polymorphism 1 （c. 163A〉G）, SNP2 （c. 501t〉G） and SNP3 （c. 918C〉t）, were found in exons 3, 8 and 10. the 30 patients with azoospermia and 80 normal pregnancy-proven, fertile men were analyzed for HORMAD1 polymorphisms. Both SNP1 and SNP2 were associated with human azoospermia caused by complete early meiotic arrest （P〈0.0S）. We suggest that the HORMAD1 has an essential meiotic function in human spermatogenesis.

关键词： azoospermia HORMAD1 male infertility male meiosis SNP

Up-Regulation of Local tGF-β Contributes to a Decrease in Renal tubular Na⁺-K⁺ AtPase and Hyperkalemia in a Mouse Model of Crush Syndrome

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Pharmacology & Pharmacy 2016年第12期7卷 481-492页

作者： Shinya Mizuno Yoko Mizuno-horikawa Department of Biochemistry Osaka University Graduate School of Medicine Suita Japan Department of Immunology and Microbiology Osaka University Graduate School of Medicine Suita Japan the Institute of Experimental Animal Sciences Suita Japan

Hyperkalemia is one of the most important risk factors in patients suffering from crush syndrome with rhabdomyolysis. Glycerol-injected animals have been used as an experimental model of rhabdomyolysis-induced acute kidney injury (AKI), but little information is available for the onset and molecular mechanism of hyperkalemia. In our murine model, plasma potassium levels increased after a single injection of 50%-glycerol solution (10 ml/kg, i.m.) during the progression of muscular and renal injuries. Renal tubular Na+-K+-AtPase functions as ion-exchange pomp for potassium clearance from blood into renal tubular epithelial cells. Renal histochemistry revealed an apparent decrease in the tubular Na+-K+-AtPase expression, especially at 24 hours post-glycerol challenge in our AKI model. In contrast to the loss in active Na+-K+-AtPase, there was a significant increase in the renal levels of transforming growth factor-β (tGF-β) that is known to suppress Na+-K+-AtPase production in vitro. When anti-tGF-β antibody was administered in mice after the glycerol challenge, the suppression of renal Na+-K+-AtPase activity was partially restored. As a result, hyperkalemia was improved in the tGF-β-neutralized AKI mice, associated with a significant decrease in plasma potassium concentration. taken together, we predict that endogenous tGF-β is a key regulator for inhibiting Na+-K+-AtPase production and, in part, enhancing hyperkalemia during progression of rhabdomyolysis-induced AKI. this is, to our knowledge, the first report to determine a critical role of endogenous tGF-β in renal potassium metabolism during crush syndrome.

关键词： Rhabdomyolysis AKI Hyperkalemia Na+-K+-AtPase tGF-β

Correlation between catalytic activity of supported gold catalysts for carbon monoxide oxidation and metal–oxygen binding energy of the support metal oxides

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 Journal of Catalysis 2016年第10期37卷 1651-1655页

作者： takashi Fujita Masanori horikawa takashi takei tom Murayama Masatake Haruta 首都大学东京城市环境科学研究生院应用化学系日本东京192-0397

the effect of a wide variety of metal oxide （MOx） supports has been discussed for CO oxidation on nanoparticulate gold catalysts. By using typical co‐precipitation and deposition–precipitation methods and under identical calcination conditions, supported gold catalysts were prepared on a wide variety of MOx supports, and the temperature for 50%conversion was measured to qualita‐tively evaluate the catalytic activities of these simple MOx and supported Au catalysts. Furthermore, the difference in these temperatures for the simple MOx compared to the supported Au catalysts is plotted against the metal–oxygen binding energies of the support MOx. A clear volcano‐like correla‐tion between the temperature difference and the metal–oxygen binding energies is observed. this correlation suggests that the use of MOx with appropriate metal–oxygen binding energies （300–500 kJ/atom O） greatly improves the catalytic activity of MOx by the deposition of Au NPs.

关键词： Metal oxide-supported gold nanoparticle catalyst Support effects Carbon monoxide oxidation Volcano-like correlation Metal-oxygen binding energy

维普期刊数据库

Efficacy of long-term rifaximin treatment for hepatic encephalopathy in the Japanese

在线全文

学校读者我要写书评

暂无评论

World Journal of Hepatology 2019年第6期11卷 531-541页

作者： Shinya Nishida Koichi Hamada Noriyuki Nishino Daizo Fukushima Ryota Koyanagi Yoshinori horikawa Yoshiki Shiwa Satoshi Saitoh Department of Gastroenterology Shin-Yurigaoka General HospitalKawasaki 215-0026Japan Department of Gastroenterology Southern-Tohoku General HospitalKoriyama 963-8563Japan Department of Minimally Invasive Surgical and Medical Oncology Fukushima Medical UniversityFukushima 960-1295Japan Department of Hepatology Toranomon HospitalTokyo 105-8470Japan

BACKGROUND Hepatic encephalopathy(HE)is a complication of liver cirrhosis and can result in neuropsychological and neuromuscular dysfunctions in ***,an antibiotic,has been reported to decrease the occurrence of overt HE and also improve cognitive function in studies from Europe and the United States of *** is not enough evidence of the relationship between the long-term use of rifaximin and its clinical effects in the *** to determine the clinical effects of long-term rifaximin therapy in decompensated liver cirrhosis patients,with overt HE or *** In this single-center retrospective observational cohort study,we reviewed the data of 38 patients who had taken rifaximin at the dose of 1200 mg/d for more than 24 *** primary outcome measured was the efficacy of long-term rifaximin use,and secondary outcome measured was the safety of its long-term use as determined by its influence on portosystemic shunts as well as Escherichia coli-related ***,we compared the prognosis between the rifaximin group and control cases,matched for hepatic elasticity assessed by magnetic resonance ela-stography,age,and Child-Pugh *** Of the 38 patients included in the study,12(31.6%)had overt HE,27(71.1%)had complications of esophageal varices,and 9(23.7%)had hepatocellular carcinoma(HCC).the control group was matched for age,Child-Pugh classification,liver stiffness,and presence of *** median of serum ammonia level before treatment was 104μg/dL(59-297),and 2 wk after treatment,it significantly decreased to 85μg/dL(34-153)(P=0.002).A significantly low value of 80.5μg/dL(44-150)was maintained 24 wk after *** long-term use of rifaximin did not cause a decline in liver *** occurred in 2 patients,who improved with the administration of probiotics,and there were no cases of aborted rifaximin therapy owing to adverse *** patients with Child C,the survival was short,but there

关键词： Hepatic encephalopathy Rifaximin Hepatic cirrhosis Spontaneous portosystemic shunt Magnetic resonance elastography Child-Pugh classification