检索结果-南通市图书馆

Mixing of two different electrolyte solutions in electromagnetic rectangular mixers

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2016年第1期28卷 114-124页

作者： Meimei WEN Chang Nyung kim Yue yan Department of Mechanical Engineering Graduate School Kyung Hee University Department of Mechanical Engineering College of Engineering Kyung Hee University

This study proposes a new electromagnetic rectangular mixer, and numerically examines the mixing characteristics of two different electrolyte solutions in the device under a uniform magnetic field. The mixer consists of a conduit with electrodes equipped on its top and bottom walls. The difference in the electric potentials applied to the sets of electrodes induces the current. The combination of the induced current and magnetic field yields Lorentz force, resulting in the fluid motion for pumping and mixing of the two different fluids. The numerical simulation is carried out with the use of commercial software CFX. The present numerical model is validated by an existing numerical work. The effect of different variables on mixing efficiency is investigated in many different cases with two different heights of the duct and various input voltages of the electrodes. The current simulation results indicate that the mixing performance can be enhanced by using multiple sets of electrodes and applying higher input voltages（absolute values） to the electrodes.

关键词： CFX electrolyte solution Lorentz force mixer mixing efficiency

In situ synthesis of chemically bonded NaTi2（PO4）3/rGO 2D nanocomposite for high-rate sodium-ion batteries

在线全文

学校读者我要写书评

暂无评论

Nano Research 2016年第6期9卷 1844-1855页

作者： ha-Kyung Roh Hyun-Kyung kim Myeong-Seong kim Dong-Hyun kim Kyung Yoon Chung Kwang Chul Roh Kwang-Bum kim Department of Material Science & Engineering Yonsei University 50 Yonsei-ro Seodaemun-gu Seou103722 Republic of Korea Department of Materials Science and Metallurgy University of Cambridge 27 Charles Babbage Road Cambridge CB30FS UK Center for Energy Convergence Korea Institute of Science and Technology 5 Hwarang-ro 14-gil Seongbuk-gu Seou102792 Republic of Korea Energy & Environmental Division Korea Institute of Ceramic Engineering & Technology 101 Soho-ro Jinju-si Gyeongsangnam-do 52851 Republic of Korea

A phase-pure NaTi2（PO4）3/reduced graphene oxide （rGO） nanocomposite was prepared using a microwave-assisted one-pot method and subsequent heat treatment. The well-crystallized NaTi2（PO4）3 nanoparticles （30-40 nm） were uniformly precipitated on rGO templates through Ti-O-C bonds. The chemical interactions between the NaTi2（PO4）3 nanoparticles and rGO could immobilize the NaTi2（PO4）3 nanoparticles on the rGO sheets, which might be responsible for the excellent electrochemical performance of the nanocomposite. The NaTi2（PO4）B/rGO nanocomposite exhibited a specific capacity of 128.6 mA-h.g-1 approaching the theoretical value at a 0.1 C-rate with an excellent rate capability （72.9% capacity retention at 50 C-rate） and cycling performance （only 4.5% capacity loss after 1,000 cycles at a high rate of 10 C）. These properties were maintained even when the electrodes were prepared without the use of an additional conducting agent. The excellent sodium storage properties of the NaTi2（PO4）B/rGO nanocomposite could be attributed to the nano-sized NaTi2（PO4）3 particles, which significantly reduced the transport lengths for Na＋ ions, and an intimate contact between the NaTi2（PO4）3 particles and rGO due to chemical bonding.

关键词： NaTi2(PO4)dreducedgraphene oxide (rGO)nanocomposite chemical bonding energy-efficiency in situ synthesis high-rate sodium-ion batteries

Crystal structure of Arabidopsis thaliana RabA_(1a)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Integrative Plant Biology 2019年第2期61卷 93-109页

作者： Ji-Sook Yun Sung Chul ha Shinae kim Yeon-Gil kim Hyeran kim Jeong Ho Chang Department of Biology Education Kyungpook National University Beamline Science Division Pohang Accelerator Laboratory Department of Biological Sciences Kangwon National University

RabGTPase is a member of the Ras superfamily of small GTPases, which share a GTP-binding pocket containing highly conserved motifs that promote GTP hydrolysis. In Arabidopsis, the RabA group, which corresponds to the Rab_(11) group in animals, functions in the recycling of endosomes that control docking and fusion during vesicle transport. However, their molecular mechanisms remain unknown. In this study, we determined the crystal structures of the GDP-bound inactive form and both GppNHp-and GTP-bound active forms of RabA1a, at resolutions of 2.8, 2.6, and 2.6 A?,respectively. A bound sulfate ion in the active site of the GDP-bound structure stabilized Switch Ⅱ by bridging the interaction between a magnesium ion and *** of the two states of RabA1a with Rab_(11) proteins revealed clear differences in the Switch Ⅰ and Ⅱ loops. These results suggested that conformational change of the Switch regions of RabA1a, derived by GTP or GDP binding, could maintain subcellular membrane traffic through the specific interaction of effector molecules.

关键词： GDP Crystal structure of Arabidopsis thaliana RabA Figure

Mechanistic links between gut microbial community dynamics, microbial functions and metabolic health

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2014年第44期20卷 16498-16517页

作者： Connie WY ha yan Y Lam Andrew J Holmes School of Molecular Bio-science and Charles Perkins Centre The University of Sydney Pennington Biomedical Research Center

Gut microbes comprise a high density, biologically active community that lies at the interface of an animal with its nutritional environment. Consequently their activity profoundly influences many aspects of the physiology and metabolism of the host animal. A range of microbial structural components and metabolites directly interact with host intestinal cells and tissues to influence nutrient uptake and epithelial health. Endocrine, neuronal and lymphoid cells in the gut also integrate signals from these microbial factors to influence systemic responses. Dysregulation of these host-microbe interactions is now recognised as a major risk factor in the development of metabolic dysfunction. This is a two-way process and understanding the factors that tip host-microbiome homeostasis over to dysbiosis requires greater appreciation of the host feedbacks that contribute to regulation of microbial community composition. To date, numerous studies have employed taxonomic profiling approaches to explore the links between microbial composition and host outcomes(especially obesity and its comorbidities), but inconsistent host-microbe associations have been reported. Available data indicates multiple factors have contributed to discrepancies between studies. These include the high level of functional redundancy in host-microbiome interactions combined with individual variation in microbiome composition; differences in study design, diet composition and host system between studies; and inherent limitations to the resolution of r RNA-based community profiling. Accounting for these factors allows for recognition of the common microbial and host factors driving community composition and development of dysbiosis on high fat diets. New therapeutic intervention options are now emerging.

关键词： Microbiome Dysbiosis High fat diet Bile Intestinal mucosa Microbe-associated molecular patterns Short chain fatty acids Immunomodulation Enteroendocrine cells

The Spinal-Parabrachial-Mesencephalic Circuit: A Possible Explanation of How Pain Leads to Emotional Disorders

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Neuroscience Bulletin 2022年第4期38卷 456-458页

作者： Hongze yan Guokang Mo Ngoc T.ha Juan Deng School of Basic Medical Sciences Fudan UniversityShanghai 200032China Department of Physiology Anatomyand GeneticsUniversity of OxfordOxfordOxfordshire OX13PTEngland Institute for Translational Brain Research MOE Frontiers Center for Brain ScienceFudan UniversityShanghai 200032China

The ability to feel pain isessential for sensing the everchanging environment for potential danger,and thus,is important for the survival of an *** in 10 adults experiences chronic pain,which is one of the major causes of human suffering and is often associated with emotional distress such as depression,anxiety,and reduced motivation[1].These negative affective componentsofpain not only augment the perceptionof pain,but also,reduce the success rate of pain treatment in the ***,how does chronic pain lead to these psychological effects?

关键词： motivation emotional such

Type I interferon： the mediator of bacterial infection-induced necroptosis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Cellular & Molecular Immunology 2013年第1期10卷 4-6页

作者： Qinglin Du Jianping Xie ha-Jeong kim Xiaojing Ma Institute of Modern Biopharmaceuticals School of Life Science Southwest University Chongqing China Oepartment of Microbiololgy and Immunology WeillCornell Medical Collese New York NY USA Sheng Yushou Center of Cell Biology and Immunology School of Life Sciences and Biotechnology Shanghai Jiao Tong University Shanghai China |

COMMENTARY Innate immune responses are essential for the host to fight against invading microbes. Innate immune receptors or pattern recog- nition receptors recognize conserved microbial molecules and trigger innate immune res- ponses. Pattern recognition receptors such as Toll-like receptors primarily signal through the adaptor MyD88 to activate NF-~B, while other Toll-like receptors signal v/a TRIF to activate IRF-3 resulting in the expression of type I interferons （IFNs）.a Type I IFNs play a crucial role in antiviral immune responses but are also important for the host response against bac- terial infection.2 Paradoxically.

关键词： Type I interferon bacterial infection-induced necroptosis

Decadal Changes in Climatological Intraseasonal Fluctuation of Subseasonal Evolution of Summer Precipitation over the Korean Peninsula in the mid-1990s

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Advances in Atmospheric Sciences 2011年第3期28卷 591-600页

作者： WonMoo kim Jong-Ghap JHUN Kyung-Ja ha Masahide kimOTO School of Earth and Environmental Sciences/Research Institute of Oceanography Seoul National University151-742Korea Divison of Earth Environmental System Pusan National University609-735Korea Atmosphere and Ocean Research Institute University of Tokyo277-8564Japan

Decadal changes in the subseasonal evolution and the phase-locked climatological intraseasonal fluctuation of summertime rainfall over the Korean Peninsula before and after the mid-1990s are *** activity and the migration speed of the monsoon rain band over the East Asian region are altered in the recent decade,resulting in the drier conditions in late spring and the earlier onset of *** early August when a climatological monsoon break was clear in the earlier decade,the precipitation has increased dramatically with a meridional *** response to the enhanced convection over the South China Sea and southeastern China provides a favorable condition for more precipitation in early August through the changes in moisture transport and tropical cyclone passage.

关键词： decadal change intraseasonal fluctuation East Asian summer monsoon

Effect of Al addition on corrosion behavior of high-purity Mg in terms of processing history

在线全文

学校读者我要写书评

暂无评论

Journal of Magnesium and Alloys 2023年第3期11卷 851-868页

作者： Sang Kyu Woo Byeong-Chan Suh ha Sik kim Chang Dong Yim Helmholtz Zentrum Hereon Max-Planck-Straße 1Geesthacht D-21502Germany Korea Institute of Materials Science 797 Changwondae-roSeongsan-guChangwonGyeongnam 51508Republic of Korea University of Science and Technology 217 Gajeong-roYuseong-guDaejeon 34113Republic of Korea

In this study,the effects of Al addition on the corrosion behavior of pure Mg with controlled impurity contents were systematically analyzed according to the processing *** results revealed that the corrosion behavior of high-purity Mg-Al alloys is strongly related to changes in the microstructure,including theβphase and Al-Mn or Al-Fe phases,and the protectiveness of the surface film according to the Al content and processing *** the as-cast alloys,the corrosion rate increased due to the increase ofβphase as the Al content increased,but in the as-extruded alloys,the corrosion rate,which was high due to intermetallic compounds caused by impurities in the low Al alloy,decreased as the Al content increased,and then increased *** is due to the combined effect of the increase of theβphase and decrease of the impurity effect,and the increase of the dissolved Al *** results suggest that it is necessary to analyze the effect of alloying elements on the corrosion behavior of pure Mg with information concerning the impurity content and processing history.

关键词： Mg High purity Mg-Al alloys Processing history Micro-galvanic Surface film

Decoupling co-existing surface plasmon polariton （SPP） modes in a nanowire plasmonic waveguide for quantitative mode analysis

在线全文

学校读者我要写书评

暂无评论

Nano Research 2017年第7期10卷 2395-2404页

作者： Sanggon kim Sabrina Bailey Ming Liu Ruoxue yan Department of Chemical and Environmental Engineering University of California Riverside California 9252 1 USA Department of Electrical Engineering University of California Riverside California 92521 USA

Knowledge of surface plasmon polariton （SPP） modes in one-dimensional （1D） metallic nanostructures is essential for the development of subwavelength optical devices such as photonic circuits, integrated light sources, and photo- detectors. Despite many efforts to characterize the propagation parameters of these subwavelength 1D plasmonic waveguides, such as Ag nanowires, large discrepancies exist among available reports owing to their sensitivity to the relative weights of co-existing SPP modes and the lack of a method of decoupling these modes and analyzing them separately. In this work, we develop an interference method to distinguish different SPP modes that are simultaneously excited in a Ag nanowire waveguide and measure their propagation parameters separately. By extracting information from the propagation-distance- dependent intensity oscillations of the scattered light from the nanowire tip, the effective refractive indices, propagation lengths, and relative mode weights of co-existing SPP modes supported by the nanowire are derived from a mode interference model. These parameters depend strongly on the nanowire diameter and excitation wavelength. In particular, we demonstrate the possibility of selective excitation of different SPP modes by varying the nanowire diameter. This new mode analysis technique provides unique insights into the develop- ment and optimization of SPP-based applications.

关键词： surface plasmon polariton(SPP) silver nanowire propagation length effective refractive index mode weight