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Electrical resistivity and magnetization of Sr$_{1-x}K_xBiO_3$ superconductor in magnetic field: Observation of a reentrant superconducting resistive transition at low temperature

  • Kim, J.S.;Kim, D.C.;Joo, S.J.;Kim, G.T.;Lee, S.Y.;Khim, Z.G.;Bougerol-Chaillout, C.;Kazakov, S.M.;Pshirkov, J.S.;Antipov, E.V.;Park, Y.W.
    • 한국초전도학회:학술대회논문집
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    • v.9
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    • pp.210-213
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    • 1999
  • Magnetoresistance and magnetization of Sr$_{l-x}K_xBiO_3$ were both measured as functions of temperature and magnetic field. Resistivity goes to zero at T=10.1K and the overall superconducting transition behavior under applied magnetic fields is similar to that of other BiO based superconductors. Also, below T<5K we have observed the reappearance of finite resistivity with a power law temperature dependence( ${\rho}$ ${\sim}$T$^1$); the reentrant superconducting transition of resistivity. Contrary to the Josephson weak link effect in polycrystalline samples, which gives the depression of the superconducting state with increasing electrical current or magnetic field, the superconducting state for T<5K is resumed by applying a higher current or magnetic field. Magnetic susceptibility( ${\chi}$ ) of Sr$_{l-x}K_xBiO_3$ for T<5K also shows similar trends to that observed in transport measurements: increase of ${\chi}$ (paramagnetic-like behavior) at a low magnetic fields(B=50 Oe) and, the resumption of perfect diamagnetism at high fields.

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Lernstrategie der Tempusverwendung in Bezug auf das prozeduales $Ged\"{a}chtnis$ (수행처리적 기억으로의 시제 문법 활용 - 기억$\cdot$인지효과를 향상시키기 위한 시제 학습 전략 -)

  • Park Hyun-Sun
    • Koreanishche Zeitschrift fur Deutsche Sprachwissenschaft
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    • v.10
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    • pp.155-174
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    • 2004
  • Wir $k\"{o}nnen$ die $Ged\"{a}chtnisforschungen$ mit Fremdsprachenlernen $verkn\"{u}pfen$. Ein Lernprozess ist gerade einer vom $Ged\"{a}chtnisprozess$. $F\"{u}r$ einen erfolgreichen Fremdsprachenunterricht ist es $n\"{o}tig$, dass beim Lernprozess ein Sprachwissen vom deklarativen $Ged\"{a}chtnis$ ins prozeduale $Ged\"{a}chtnis$ $\"{u}bertragen$ wird. Aber ein Lernerfolg ist je nach dem Individiuum anders. d.h. der unterschiedliche Lerneffekt zwischen Lemenden $h\"{a}ngt$ eventuelle von $pers\"{o}nlichen$ Erfahrung und von dem episodischen $Ged\"{a}chtnis$. Beim Lernprozess muss Sprachwissen vom deklarativen $Ged\"{a}chtnis$ zum prozedualen $Ged\"{a}chtnis$ $\"{u}bertragen$ werden, um Fremdsprachen zu beherrschen. Inzwischen spielen implizites $Ged\"{a}chtnis$ und episodisches $Ged\"{a}chnis$ wichtig Rolle beim $\"{U}bertragungsprozess$. $Daf\"{u}r$ zeigen wir Lernstrategie der Tempusverwendung in Bezug auf die $Ged\"{a}chtnisforschung$. Mit welchem Tempus will man seine Intention im Text $ausdr\"{u}cken$? $Daf\"{u}r$ zeigen wir ein einfaches Spiel $f\"{u}r$ den Fremdsprachenunterricht. Das ist das Spiel zur Strategie der Tempusverwendung bei der Textproduktion $f\"{u}r$ das reportiv-orientierte Thema. Unsere Untersuchung der Tempera kann besonders im Fremdsprachenunterricht dizu beitragen, dass der Lernende als Produzent einerseits unter Berucksichtigung der Textsorte, der zeitlichen Orientierung des Theams und der Sprecherabsicht bei der Textproduktion die Tempera ohne $Z\"{o}gern$ $ausw\"{a}hlen$ und benutzen kann und dass der Lernende als Rezipient auch durch das Erlernen der verschiedenen Funktionen der Tempera versteckte Absichten des Produzenten richtig verstehen kann. Unsere Untersuchung kann in diesem Sinne hinsichtlich der Tempusfunktion bei der erfolgreichen Erweiterung der kommunikativen $F\"{a}higkeiten$ im Unterricht behilflich sein.

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Magnetic Properties of NiZn-ferrite Synthesized from Waste Iron Oxide Catalyst (산화철 폐촉매로부터 합성된 NiZn- 페라이트의 자기적 특성)

  • Hwang, Yeon;Kwon, Soon-Kil;Lee, Hyo-Sook;Je, Hae-June;Park, Sang-Il
    • Journal of the Korean Ceramic Society
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    • v.38 no.12
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    • pp.1162-1166
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    • 2001
  • NiZn-ferrite was synthesized from waste catalysts, which were produced from styrene monomer process and buried underground as an industrial wastes, and its magnetic properties were investigated. Nickel oxide and zinc oxide powders were mixed with finely ground waste catalysts, and spinel type ferrite was obtained by calcination at 900$\^{C}$ and sintering at 1230$\^{C}$ for 5 hours. The intial permeability was measured and reflection loss was calculated from S-parameters for the composition of Ni$\_$x/Zn$\_$1-x/Fe$_2$O$_4$(x=0.36, 0.50, 0.66). NiZn-ferrite synthesized from waste iron oxide catalyst showed a feasibility for the use as electromagnetic wave absorber in X-band.

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Review of Clinical Researches in Chinese Medical Journal for Acupuncture, Moxibustion, and Manual Therapy of Pediatric Growth (소아 성장의 침구 및 수기요법에 대한 중의학 임상 연구 고찰)

  • Park, Sul Gi;Park, So Hyun;Lee, Sun Haeng;Lee, Jin Yong
    • The Journal of Pediatrics of Korean Medicine
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    • v.33 no.1
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    • pp.58-77
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    • 2019
  • Objectives The purpose of this study is to investigate clinical studies on the effect of acupuncture, moxibustion, and manual therapy in pediatric growth by analyzing randomized controlled trials conducted in China. Methods We searched the clinical studies from the China Academic Journal (CAJ) in China National Knowledge Infrastructure (CNKI) by specific key words and criteria. Selected 31 clinical studies were collected and analyzed. Results Total of 31 randomized controlled trials were selected and analyzed. In most of the studies, the effectiveness of acupuncture, moxibustion, and manual therapy on growth was significantly high. The most commonly used therapies were massage. The most commonly used massage methods were pinching spine (捏脊), pressing and kneading $Z\acute{u}s\bar{a}nl\check{i}$ (按?足三里), supplementing $P\acute{i}j\bar{i}ng$ (補脾經), supplementing $Sh\grave{e}nj\bar{i}ng$ (補腎經), rubbing Abdomen (摩腹), pushing $Y\check{o}ngqu\acute{a}n$ (推涌泉), supplementing $F\grave{e}ij\bar{i}ng$ (補肺經), kneading $T\grave{a}iy\acute{a}ng$ (?太陽), and kneading $Sh\acute{e}nqu\grave{e}$ (?神闕) etc. Conclusions Based on the results of the clinical studies from China, acupuncture, moxibustion, and manual therapy can be a valuable option for pediatric growth.

The Historical Study of Headache in Chinese Ming Dynasty (명대의가(明代醫家)들의 두통(頭痛)에 대한 인식변화에 관한 연구)

  • Chun, Duk-Bong;Maeng, Woong-Jae;Kim, Nam-Il
    • The Journal of Korean Medical History
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    • v.24 no.1
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    • pp.43-56
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    • 2011
  • Everyone once in a life experience headaches as symptoms are very common. According to a study in a country of more than a week and as many as those who have experienced a headache amounts to 69.4%. In addition, the high reported prevalence of migraine in 30s for 80% of all migraine sufferers daily life interfere with work or was affected. In Western medicine, the cause of headaches is traction or deformation of pain induced tissue like scalp, subcutaneous tissue, muscle, fascia, extracranial arteriovenous, nerves, periosteum. But it turns out there are not cause why pain induced tissue is being tracted or deformated. Therefore, most of the western-therapy is mainly conducted with regimen for a temporary symptom reduction. Therefore, I examined how it has been developed in Chinese Ming Dynasty, the perception of headache, change in disease stage and an etiological cause. Oriental medicine in the treatment of headache is a more fundamental way to have an excellent treatment. The recognition of head in "素問($s{\grave{u}}$ $w{\grave{e}}n$)" and "靈樞($l{\acute{i}}ng$ $sh{\bar{u}}$)" began to appear in 'Soul-神($sh{\acute{e}}n$) dwelling place' and 'where to gather all the Yang-'諸陽之會($zh{\bar{u}}$ $y{\acute{a}}ng$ $zh{\bar{i}}$ $hu{\grave{i}}$)'. Also, head was recognized as '六腑($li{\grave{u}}f{\check{u}}$) 淸陽之氣($q{\bar{i}}ng$ $y{\acute{a}}ng$ $zh{\bar{i}}$ $q{\grave{i}}$) and 五臟($w{\check{u}}$ $z{\grave{a}}ng$) 精血($j{\bar{i}}ng$ $xu{\grave{e}}$) gathering place'. More specific structures such as the brain is considered a sea of marrow(髓海-$su{\check{i}}$ $h{\check{a}}i$) in "內經($n{\grave{e}}i$ $j{\bar{i}}ng$)" and came to recognized place where a stroke occurs. Accompanying development of the recognition about head, there had been changed about the perception of headache and the recognition of the cause and mechanism of headache. And the recognition of headache began to be completed in Ming Dynasty through Jin, Yuan Dynasty. Chinese Ming Dynasty, specially 樓英($l{\acute{o}}u$ $y{\bar{i}}ng$), in "醫學綱目($y{\bar{i}}xu{\acute{e}}$ $g{\bar{a}}ngm{\grave{u}}$)", first enumerated prescription in detail by separating postpartum headache. and proposed treatment of headache especially due to postpartum sepsis(敗血-$b{\grave{a}}i$ $xu{\grave{e}}$). 許浚($x{\check{u}}$ $j{\grave{u}}n$) accepted a variety of views without impartial opinion in explaining one kind of headache in "東醫寶鑑($d{\bar{o}}ng-y{\bar{i}}$ $b{\check{a}}oji{\grave{a}}n)$" 張景岳($zh{\bar{a}}ng$ $j{\check{i}}ng$ $yu{\grave{e}}$), in "景岳全書($j{\check{i}}ng$ $yu{\grave{e}}$ $qu{\acute{a}}nsh{\bar{u}}$)", established his own unique classification system-新舊表裏($x{\bar{i}}nji{\grave{u}}$ $bi{\check{a}}ol{\check{i}}$)-, and offered a clear way even in treatment. Acupuncture treatment of headache in the choice of meridian has been developed as a single acupuncture point. Using the classification of headache to come for future generation as a way of locating acupoints were developed. Chinese Ming Dynasty, there are special treatments like 導引按蹻法($d{\check{a}}o$ y ${\check{i}}n$ ${\grave{a}}n$ $ji{\check{a}}o$ $f{\check{a}}$), 搐鼻法($ch{\grave{u}}$ $b{\acute{i}}$ $f{\check{a}})$, 吐法($t{\check{u}}$ $f{\check{a}}$), 外貼法($w{\grave{a}}i$ $ti{\bar{e}}$ $f{\check{a}}$), 熨法($y{\grave{u}}n$ $f{\check{a}}$), 點眼法($di{\check{a}}n$ $y{\check{a}}n$ $f{\check{a}}$), 熏蒸法($x{\bar{u}}nzh{\bar{e}}ng$ $f{\check{a}}$), 香氣療法($xi{\bar{a}}ngq{\grave{i}}$ $li{\acute{a}}of{\check{a}}$). Most of this therapy in the treatment of headache, it is not used here, but if you use a good fit for today's environment can make a difference.

Studies on the Controlled Release Fertilizer METAP Application on Paddy Rice (1972) (수도에 대한 완효성비료 METAP의 비효시험(1972))

  • Lee, E.W.;Ahn, S.B.;Lee, M.H.;Lee, Z.Y.;Song, N.H.;Kwon, S.M.;Kim, C.Y.;Choe, B.C.;Chung, H.S.;Cho, B.O.;Lee, I.J.;Park, C.S.;Ko, C.S.;Park, K.H.;Chung, S.C.;Chung, H.S.;Lee, H.D.;Park, S.T.;Lee, H.S.;Choe, S.R.
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.13
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    • pp.107-118
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    • 1973
  • Experiments were carried out to study the effectiveness of METAP as a slow released fertilizer on the growth, grain yield and its components of paddy rice, and to compare its effects with those of single fertilizers in the fields of 3 Crop Experiment Stations and 7 provincial Offices of Rural Development. The effectiveness of METAP seems to be different according to the physical and chemical characteristics of soil, the time of application, climatic conditions, variety and cultural methods. Therefore, the experimental results obtained from the above experiment are summurized as follows: 1. When METAP was applied into sandy soil, grain yield was increased due to increase of the number of panicles, and split application of METAP was more effective than basal only. However, in the reclaimed soil, not heavily percolated soil and fertile soil, no differences were observed between MET AP and single fertilizer applied plot. 2. When a rice variety, 'TONGIL' which is sensitive to the low temperature and produce higher yield in the early transplanting, was not transplanted early and air temperature is relatively lower during the ripening stage, the percentage of ripened grains and 1,000 grains weight were not higher in the METAP applied plots than in the single fertilizer applied plots.

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Effects of the Seed Treatment on Field Germination and Seedling Growth in four useful species, Euonymus alatus, Nandina domestica, Thea sinensis and Zanthoxylum piperitum (화살, 남천, 차, 초피나무 4유용수종(有用樹種)의 종자(種子) 발아촉진처리(發芽促進處理)가 포지발아(圃地發芽)와 유묘(幼苗) 생장(生長)에 미치는 효과)

  • Goo, Gwan Hyo;Choi, Jai Sik;Youn, Ki Sik
    • Journal of Korean Society of Forest Science
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    • v.84 no.1
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    • pp.87-96
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    • 1995
  • We examined the effects of seed treatment on field germination rate and seedling growth for four woody species, Euonymus alatus, Thea sinensis, Zanthoxylum piperitum, Nandina domestia which are economically useful in Korea. The seeds of each species were purified carefully after collection during Oct. and Nov.. E. alatus, T. sinensis, and Z. piperitum were sowed in the experimental field after stored in open ground with treatment of Pon-Pon. $H_2O_2$, $GA_3$, scarification. and N. domestica was sowed in container within green house after treatment of three different periods(7, 15, 21days) in growth chamber(4, 25, $32^{\circ}C$). Germination rate and seedling growth were measured in mid-Oct.. In E. alatus germination rate was higher in storaging in open ground after soaking in $GA_3$(67.1%) than in only storaging in open ground(18.4%). But the rate in T. sinensis showed no differences between storage in open ground after treatment of $GA_3$, and scarification, and only storage in open ground, Germination rate of Z. piperitum was much higher in storaging in open ground after treatment of Pon-Pon(80.3%) than in only storaging in open ground(12.4%). In N. domestica. seeds stored for 7 days at $32^{\circ}C$ were germinated faster than those stored for 7 days at $4^{\circ}C$, and germination rate of the former was also higher than that of the latter. Peak Times of seed germination in field were order of E. alatus (32 days). Z. piperitum (49 days). T. sinensis (83 days), N. domestica (87 days). The growth of seedling germinated in field showed a good result because of early germination following the effect of seed treatment. The periods of highest growth performances of the seedlings were 72 days in late Jun.-mid Jul. in E. alatus. 59 days in late Jun.- mid Jul. in Z. Piperitum, and 45 days in mid Aug.- mid Sep. in T. sinensis.

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Studies on the fabrication and properties of $La_ 0.7Sr_0.3MnO_3$cathode contact prepared by glycine-nitrate process and solid state reaction method for the high efficient solid oxide fuel cells applications 0.3/Mn $O_{3}$ (고효율 고체산화물 연료전지 개발을 위한 자발 착화 연소 합성법과 고상반응법에 의한 $La_ 0.7Sr_0.3MnO_3$ 양극재료 제조 및 물성에 관한 연구)

  • Shin, Woong-Shun;Park, In-Sik;Kim, Sun-Jae;Park, Sung
    • Electrical & Electronic Materials
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    • v.10 no.2
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    • pp.141-149
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    • 1997
  • L $a_{0.7}$S $r_{0.3}$Mn $O_{3}$ powders were prepared by both GNP(Glycine-Nitrate Process) and solid state reaction method in various of calcination temperature(800-1000.deg. C) and time in air. Also, L $a_{0.7}$S $r_{0.3}$Mn $O_{3}$ cathode contacts on YSZ(Yttria-Stabilized Zirconia) substrate were prepared by screen printing and sintering method as a function of sintering temperature(1100-1450.deg. C) in air. Sintering behaviors have been investigated by SEM(Scanning Electron Microscope) and porosity measurement. Compositional and structural characterization were carried out by X-ray diffractometer and ICP AES(Inductively Coupled Plasma-Atomic Emission Spectrometry) analysis. Electrical characterization was carried out by the electrical conductivity with linear 4 point probe method. As the calcination period increased in solid state reaction method, L $a_{0.7}$S $r_{0.3}$Mn $O_{3}$ phase increased. Although L $a_{0.7}$S $r_{0.3}$Mn $O_{3}$ single phase was obtained only for 48hrs at 1000.deg. C, in GNP method it was easy to get single and ultra-fine L $a_{0.7}$S $r_{0.3}$Mn $O_{3}$ powders with submicron particle size at 650.deg. C for 30min. The particle size and thickness of L $a_{0.7}$S $r_{0.3}$Mn $O_{3}$ cathode contact by solid state reaction method did not change during the heat treatment, while those by GNP method showed good sintering characteristics because initial powder size fabricated from GNP method is smaller than that fabricated from solid state reaction method. Based on enthalpy change from thermodynamic data and ICP-AES analysis, it was suggested to make cathode contact in composition of (L $a_{0.7}$S $r_{0.3}$)$_{0.91}$ Mn $O_{3}$ which have little second phase (L $a_{2}$Z $r_{2}$ $O_{7}$) for high efficient solid oxide fuel cells applications. As (L $a_{0.7}$S $r_{0.3}$)$_{0.91}$Mn $O_{3}$ cathode contact on YSZ substrate was sintering at 1250.deg. C the temperature that liquid phase sintering did not occur. It was possible to obtain proper cathode contacts with electrical conductivity of 150(S/cm) and porosity content of 30-40%.m) and porosity content of 30-40%.

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Anomalous Behavior of the Ethyl Group in the Aminolysis of S-Phenyl Acetate with Benzylamine in Acetonitrile

  • Lee, Ik-Choon;Lee, Hai-Whang;Lee, Byung-Choon;Choi, Jin-Heui
    • Bulletin of the Korean Chemical Society
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    • v.23 no.2
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    • pp.201-204
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    • 2002
  • The rates of the aminolysis of S-phenyl substituted-acetate series $(RC(=O)SC_6H_4Z$, with R=Me, Et, i-Pr, t-Bu and Bn) with benzylamines $(XC_6H_4CH_2NH_2)$ are not correlated simply with the Taft's polar $({\sigma}^{\ast})$ and/or steric effect constants $(E_s)$ of the substituents due to abnormally enhanced rate of the substrate with R=Et. Furthermore, the cross-interaction constant, ${\rho}x_z$ , is the largest with R=Et. These anomalous behaviors can only be explained by invoking the vicinal bond $({\sigma})$-antibond $({\sigma}^{\ast})$ charge transfer interaction between C-$C{\alpha}$ and C-S bonds. In the tetrahedral zwitterionic intermediate, $T^{\pm}$ , formed with R=Et the vicinal ${\sigma}_{c-c}-{\sigma}^{\ast}_{c-s}$ delocalization is the strongest with an optimum antiperiplanar arrangement and a narrow energy gap, ${\Delta}{\varepsilon}={\varepsilon}_{{\sigma}^{\ast}}-{\varepsilon}_{\sigma}$. Due to this charge transfer interaction, the stability of the intermediate increases (with the concomitant increase in the equilibrium constant K (= $k_a/k_{-a}$)) and also the leaving ability of the thiophenolate leaving group increases (and hence $k_b$ increases) so that the overall rate, $k_n\;=\;Kk_b$, is strongly enhanced. Theoretical support is provided by the natural bond orbital (NBO) analyses at the B3LYP/6-31+$G^{\ast}$ level. The anomaly exhibited by R=Et attests to the stepwise reaction mechanism in which the leaving group departure is rate limiting.

Protective Effect Against Hydroxyl Radical-induced DNA Damage and Antioxidant Mechanism of [6]-gingerol: A Chemical Study

  • Lin, Jing;Li, Xican;Chen, Li;Lu, Weizhao;Chen, Xianwen;Han, Lu;Chen, Dongfeng
    • Bulletin of the Korean Chemical Society
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    • v.35 no.6
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    • pp.1633-1638
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    • 2014
  • [6]-Gingerol is known as the major bioactive constituent of ginger. In the study, it was observed to effectively protect against ${\bullet}OH$-induced DNA damage ($IC_{50}$ $328.60{\pm}24.41{\mu}M$). Antioxidant assays indicated that [6]-gingerol could efficiently scavenge various free radicals, including ${\bullet}OH$ radical ($IC_{50}$ $70.39{\pm}1.23{\mu}M$), ${\bullet}O_2{^-}$ radical ($IC_{50}$ $228.40{\pm}9.20{\mu}M$), $DPPH{\bullet}$radical ($IC_{50}$ $27.35{\pm}1.44{\mu}M$), and $ABTS{^+}{\bullet}$radical ($IC_{50}$ $2.53{\pm}0.070{\mu}M$), and reduce $Cu^{2+}$ ion ($IC_{50}$ $11.97{\pm}0.68{\mu}M$). In order to investigate the possible mechanism, the reaction product of [6]-gingerol and $DPPH{\bullet}$ radical was further measured using HPLC combined mass spectrometry. The product showed a molecular ion peak at m/z 316 $[M+Na]^+$, and diagnostic fragment loss (m/z 28) for quinone. On this basis, it can be concluded that: (i) [6]-gingerol can effectively protect against ${\bullet}OH$-induced DNA damage; (ii) a possible mechanism for [6]-gingerol to protect against oxidative damage is ${\bullet}OH$ radical scavenging; (iii) [6]-gingerol scavenges ${\bullet}OH$ radical through hydrogen atom ($H{\bullet}$) transfer (HAT) and sequential electron (e) proton transfer (SEPT) mechanisms; and (iv) both mechanisms make [6]-gingerol be oxidized to semi-quinone or quinone forms.