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Alternating-current losses in two-layer superconducting cables consisting of second-generation superconductors coated by U-shaped ferromagnetic materials

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Chinese Physics B 2013年第12期22卷 509-513页

作者： Ahmet Cicek Fedai Inanir Fedor Gmry Department of Physics Faculty of Arts and Sciences Mehmet Akif Ersoy University Department of Physics Faculty of Arts and Sciences Recep Tayyip Erdog an University Institute of Electrical Engineering Slovak Academy of Sciences Du'bravska' Cesta 9 842 39 Bratislava Slovakia

Alternating-current losses in a two-layer superconducting cable, each layer being composed of 15 closely-spaced rectangular wires made up of second-generation superconductors when the ends of wires are coated by either a non-magnetic or strong ferromagnetic material having a U profile is numerically investigated. Computations are carried out through the finite-element method. The alternating-current losses do not increase significantly if the relative permeability of the coating is increased three orders of magnitude, provided that the current amplitude is less than half of the critical current in a superconducting wire. However, the losses are much higher for ferromagnetic coating if the amplitude of the applied current oscillating at 50 Hz is close to the critical current. The ferromagnetic coating is seen to accumulate the magnetic field lines normally on its surfaces, while the field lines are parallel to the long axes of the wires, leading to more significant flux penetration in the coated regions. This facilitates a uniform low-loss current flow in the uncoated regions of the wires. In contrast, coating with a non-magnetic material gives rise to a considerably smaller current flow in the uncoated regions, whereas the low-loss flow is maintained in the coated regions. Moreover, the current flows in opposite directions in the coated and uncoated regions, where the direction in each region is converse for the two materials.

关键词： second-generation superconductor two-layer cable ferromagnetic coating U profile alternating-current losses

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Experimental study of reaction mechanism of NO_x removal by impulse high voltage discharges

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Chinese Science Bulletin 1997年第3期42卷 218-222页

作者： Zeng, BQ Wang, ry.Li, XC Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian China

EXTENSIVE studies of SO2 and NOx removals from flue gases of coal-fired powered plants by means of low temperature plasmas have been carried out for years. Low temperature plasmas are produced by electron beam radiation （EB）, impulse high voltage discharges （IHVD）, dielectric barrier discharges （DBD）, etc. Chemical kinetic study of SO2 and NOx removals by EB was started in the 1970s, and a widely used kinetic model was completed at the end

关键词： impulse high voltage discharge chemical kinetics NO removal NO2

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Heterogeneous populations of neural stem cells contribute to myelin repair

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Neural Regeneration Research 2017年第4期12卷 509-517页

作者： Rainer Akkermann Felix Beyer Patrick Küry Neuroregeneration Laboratory Department of NeurologyMedical FacultyHeinrich-Heine-University

As ingenious as nature＇s invention of myelin sheaths within the mammalian nervous system is, as fatal can be damage to this specialized lipid structure. Long-term loss of electrical insulation and of further supportive functions myelin provides to axons, as seen in demyelinating diseases such as multiple sclerosis （MS）, leads to neurodegeneration and results in progressive disabilities. Multiple lines of evidence have demon-strated the increasing inability of oligodendrocyte precursor cells （OPCs） to replace lost oligodendrocytes （OLs） in order to restore lost myelin. Much research has been dedicated to reveal potential reasons for this regeneration deficit but despite promising approaches no remyelination-promoting drugs have successfully been developed yet. In addition to OPCs neural stem cells of the adult central nervous system also hold a high potential to generate myelinating OLs. There are at least two neural stem cell niches in the brain, the subventricular zone lining the lateral ventricles and the subgranular zone of the dentate gyrus, and an additional source of neural stem cells has been located in the central canal of the spinal cord. While a substantial body of literature has described their neurogenic capacity, still little is known about the oligodendrogenic potential of these cells, even if some animal studies have provided proof of their contribution to remyelination. In this review, we summarize and discuss these studies, taking into account the different niches, the heterogeneity within and between stem cell niches and present current strategies of how to promote stem cell-mediated myelin repair.

关键词： heterogeneity oligodendrocyte neuroregeneration multiple sclerosis inhibitors intracellular proteinlocalization adult neural stem cell niche remyelination

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Human endogenous retroviruses: ammunition for myeloid cells in neurodegenerative diseases?

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Neural Regeneration Research 2020年第6期15卷 1043-1044页

作者： Joel Gruchot David Kremer Patrick Küry Department of Neurology NeuroregenerationMedical FacultyHeinrich-Heine-University

Activation of myeloid cells by human endogenous retroviral entities:While the exact causes of neurological diseases such as multiple sclerosis(MS)or amyotrophic lateral sclerosis(ALS)are still elusive,there is evidence of a new category.of pathogenic elements called human endogenous retroviruses(HERVs)which seem to contribute to their evolution and progression by exerting inflammatory.and degenerative effects(Kury.et al.,2018).HERVs are ancient retroviral elements which account for up to 8%of the human genome and it is known that environmental factors can trigger their(re-)expression(Kury.et al.,2018).The resulting production of viral particles and/or proteins,especially from members of the HERV-W and HERV-K family,is strongly correlated with the onset and progression of neurological diseases,such as MS and ALS(Kury.et al.,2018).

关键词： endogenous diseases al.

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Novel approaches for the development of peripheral nerve regenerative therapies

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Neural Regeneration Research 2015年第11期10卷 1743-1745页

作者： Felix Beyer Patrick Küry Department of Neurology Medical Faculty Heinrich-Heine-University

Schwann cells are the myelinating glial cells of the peripheral nervous system（PNS）.By establishing lipid-rich myelin sheaths around large-caliber axons,they ensure that electrical signal transmission is accelerated-a process referred to as saltatory.signal *** from this prominent physiological function,these cells also exert important pathophysiological roles in PNS injuries or dis- eases. In contrast to the central nervous system （CNS）, the adult PNS retains a remarkably high degree of intrinsic re- generation. As a consequence, transected axons and dam- aged myelin sheaths can be repaired and nerve functional- ity can be restored. This spontaneous regenerative capacity depends on （inter） actions of macrophages, neurons, and Schwann cells.

关键词： cell Novel approaches for the development of peripheral nerve regenerative therapies FTY IVIG PNS Figure

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Chiral separation of triazole pesticide enantiomers by high performance liquid chromatography

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Chinese Journal of Chemistry 1997年第6期15卷 528-533页

作者： Yang, GS Gao, ry.Wang, QS Shen, HX Shandong Univ Dept Chem Jinan 250100 Shandong Peoples R China Nankai Univ Natl Lab Elementoorgan Chem Tianjin 300071 Peoples R China Nankai Univ Dept Chem Tianjin 300071 Peoples R China

Four triazole enantiomers of diclobutrazol (ery.hro form) (1), paclobutrazol (ery.hro form) (2), diniconazole (3) and uniconazole (4) have been separated by high performance liquid chromatography (HPLC) on chiral stationary.phase (CSP) OA-4700. Chromatographic data, and a chiral recongnition model are presented for the separation of these pesticide enantiomers. The influence of column temperature and composition of mobile phase have been described.

关键词： triazole pesticide enantiomeric separation chiral stationary.phase (CSP) high performance liquid chromatography (HPLC)

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Electrochemistry.of samarium in lithium-bery.lium fluoride salt mixture

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Journal of Rare Earths 2011年第8期29卷 798-803页

作者： Martin Straka Michal Korenko Frantisek Lisy Lórant Szatmáry Department of Fluorine Chemistry Nuclear Research Institute Rez plc 250 68 Husinec-Rez 130 Czech Republic Institute of Inorganic Chemistry Slovak Academy of Sciences Dubravska cesta 9 SK-845 36 Bratislava Slovakia

The electrochemical behaviour of samarium was investigated in LiF-BeF2 system on an inert （Mo） electrode by cyclic voltammetry.and chronopotentiometry.at 804, 833, 847 and 872 K. Redox process Sm3＋＋e–→Sm2＋ was recognized and analysed. Cyclic voltammetry.data suggested that at potential sweep rates lower than 0.25 V/s, the reduction was limited by the diffusion of Sm3＋ ions. It was not possible to observe reduction process of Sm2＋＋2e–→Sm0 due to insufficient electrochemical stability of LiF-BeF2. Diffusion coefficients of Sm3＋ ions in LiF-BeF2 were calculated from voltammetric and chronopotentiometric data in the temperature range 804–872 K. Diffusion coefficient values obeyed Arrhenius law. Activation energy was calculated to be 102.5 kJ/mol.

关键词： spent fuel reprocessing pyrochemical partitioning electrochemical separation molten fluorides LiF-BeF2 samarium rare earths

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ALIZEXOL　A．A　NOVEL　PROTOSTANE　TYPE　OF　TRITERPENE　FROM　ALISMA　ORIENTALIS（SAM）．JUZEP

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Chinese Chemical Letters 1995年第8期6卷 675-678页

作者： Zeng, L Pen, X Zhang, ry Beijing Med Univ Sch Pharmaceut Sci Dept Phytochem Beijing 100083 Peoples R China

A novel triterpene of protostane type alizexol A(1).the first compound of this class having a substituted tetraltydropyran *** been isolated from the rhizome of Alisma orientalis (Sam) *** structure was elucidated by ...

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THE　SYNTHESIS　OF　O－MONOSACCHARIDYL－METHOXYCARBONYLPHOSPHONAMIDATES　BY　ARBUZOV　REACTION

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Chinese Chemical Letters 1995年第1期6卷 23-26页

作者： Chen, ry.Chen, XR Li, H Nankai Univ Inst Elementoorgan Chem Tianjin 300071 Peoples R China

For the synthesis of O-monosaccharidyl-methoxycarhon a new method in which Arbuzov reaction of monosaccharidylphosphoramidite with methyl chloroformate is the key *** reported. Thus,a number of novel O-monosaccharidyl...

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Influence of splanchnic vascular infusion on the content of endotoxins in plasma and the translocation of intestinal bacteria in rats with acute hemorrhage necrosis pancreatitis

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World Journal of Gastroenterology 2000年第4期6卷 577-580页

作者： Qin ry.Zou SQ Wu ZD Qiu FZ Tongji Med Univ Tongji Hosp Dept Surg Wuhan 430030 Hubei Province Peoples R China

The main reason for the death of the patient with acute hemorrhage necrosis pancreatitis (AHNP) is pancreatic infection and multi-organ failure caused by endotoxemia and intestinal bacterial translocation[1-7]. However, the pathogenesis of endotoxemia and intestinal bacterial translocation remains a question[8-10]; moreover, no effective method of prevention and cure for it has been found till now[11 -15] In the present study, we infused low dose dopamine and low molecular weight dextran through the catheters to abdominal aorta and portal vein, and observed its influence on the endotoxin concentration in plasma and the rate of translocation of intestinal bacteria in AHNP rats.

关键词： acute hemorrhage necrosis pancreatitis microcirculation/splanchnic organ endotoxins/plasma intestinal bacterial translocation

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