• Title/Summary/Keyword: MIT

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Nucleophile Substitution von Arylmethylchloriden. Kinetische Untersuchung der Solvolyse von 9-Chlormethylanthracen in binaren Losungsmittelgemischen (염화아릴메틸의 친핵치환 반응. 이성분혼합용매내에서 9-클로로메틸안트라센의 가용매 분해반응의 속도론적 연구)

  • Wang-Ki Kim
    • Journal of the Korean Chemical Society
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    • v.24 no.6
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    • pp.413-420
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    • 1980
  • Die Geschwindigkeitskonstanten der Solvolyse-Reaktionen von 9-Chlormethylanthracen wurden bei verschiedenen Temperaturen in unterschiedlichen binadren Losungsmittelgemischen (Wasser/Aceton, Wasser/Acetonitril, Wasser/Methanol, Wasser/Athanol) mit Hilfe der Leitfahigkeitsmeßungen bestimmt. Die Aktivierungsparameter $E_a$, ${\Delta}H^{\neq}$ und ${\Delta}S^{\neq}$ wurden berechnet. Die Meßergebnisse deuten darauf hin, daß die Solvolyse von 9-Chlormethylanthracen in protonischen Losungsmitteln schneller ablauft als in aprotonischen Losungsmitteln; in den Meßreihen mit protonsichen bzw. mit aprotonischen Losungsmitteln steigt die Reaktionsgeschwindigkeit mit der Zunahme der Dielektrizitatskonstanten des Losungsmittels an, und die Aktivierungsparameter nehmen mit steigendem Wassergehalt zu. Es wurde festgestellt, daß die Reaktion nach einem $S_N1$-Mechanismus ablauft. Die experimentellen Daten deuten darauf hin, daß Wasser einerseits als Nucleophil und andererseits als allgemeine Base am Reaktionsmechanismus beteiligt ist.

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Das Verstehen der deutschen $K\"{o}rpersprache$ mit Interjektionen (감탄사를 수반한 독일인 신체언어 읽기)

  • Kim Young-Soon
    • Koreanishche Zeitschrift fur Deutsche Sprachwissenschaft
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    • v.2
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    • pp.285-306
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    • 2000
  • In der vorliegenden Arbeit wurde die Auffassung motiviert, dass es sich bei der deutschen $K\"{o}rpersprache$ in semiotischer Hinsicht um kommunikative Geste handelt. Die semio-syntaktischen, -semantischen und -pragmatischen Charakteristika dieser Geste wurden erortert. Insbesondere die ermittelten syntaktischen und semantischen Eigenschaften der $K\"{o}rpersprache\;sprechen\;f\"{u}r$ die Auffassung, dass sie in semio-syntaktischer, -semantischer und -pragmatischer Hinsicht mit Interjektionen $verkn\"{u}pfen\;k\"{o}nnen$. Beispielsweise wurde eine deutsche Geste 'Telefone handhaben' $angef\"{u}hrt$. Bei dieser Geste tritt eine deutsche vokalische Interjektion 'Klingeling' auf. Diese Geste stellt drei Ausdrucksvariationen(1- 3) und vier Bedeutungsvaritionen(A-D) dar: 1) Die Faust neben das Ohr halten, 2) Daumen neben das Ohr und Kleinfinger neb en den Mund halten und 3) Mit dem Zeigefinger var dem $K\"{o}rper$ frontal kreisen; A) Telefonieren thematisieren, B) Einen Telefonanruf aufforden, C) Zu einen Telefonanruf aufforden und D) Den Eingang eines Anrufs an zeigen. Mit Hilfe der semiotischen Gestenanalyse $k\"{o}nnen$ die deutschen $K\"{o}rpersprache$ mit Interjektionen alphabetisch geordnet werden, und die Gestenliste soll $f\"{u}r$ den DaF-Unterricht von Nutzen sein.

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Soft X-ray Nano-spectroscopy for Electronic Structures of Transition Metal Oxide Nano-structures

  • Oshima, Masaharu
    • Applied Science and Convergence Technology
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    • v.23 no.6
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    • pp.317-327
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    • 2014
  • In order to develop nano-devices with much lower power consumption for beyond-CMOS applications, the fundamental understanding and precise control of the electronic properties of ultrathin transition metal oxide (TMO) films are strongly required. The metal-insulator transition (MIT) is not only an important issue in solid state physics, but also a useful phenomenon for device applications like switching or memory devices. For potential use in such application, the electronic structures of MIT, observed for TMO nano-structures, have been investigated using a synchrotron radiation angle-resolved photoelectron spectroscopy system combined with a laser molecular beam epitaxy chamber and a scanning photoelectron microscopy system with 70 nm spatial resolution. In this review article, electronic structures revealed by soft X-ray nano-spectroscopy are presented for i) polarity-dependent MIT and thickness-dependent MIT of TMO ultrathin films of $LaAlO_3/SrTiO_3$ and $SrVO_3/SrTiO_3$, respectively, and ii) electric field-induced MIT of TMO nano-structures showing resistance switching behaviors due to interfacial redox reactions and/or filamentary path formation. These electronic structures have been successfully correlated with the electrical properties of nano-structured films and nano-devices.

Collective Experience: A Database-Fuelled, Inter-Disciplinary Team-Led Learning System

  • Celi, Leo A.;Mark, Roger G.;Lee, Joon;Scott, Daniel J.;Panch, Trishan
    • Journal of Computing Science and Engineering
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    • v.6 no.1
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    • pp.51-59
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    • 2012
  • We describe the framework of a data-fuelled, interdisciplinary team-led learning system. The idea is to build models using patients from one's own institution whose features are similar to an index patient as regards an outcome of interest, in order to predict the utility of diagnostic tests and interventions, as well as inform prognosis. The Laboratory of Computational Physiology at the Massachusetts Institute of Technology developed and maintains MIMIC-II, a public deidentified high- resolution database of patients admitted to Beth Israel Deaconess Medical Center. It hosts teams of clinicians (nurses, doctors, pharmacists) and scientists (database engineers, modelers, epidemiologists) who translate the day-to-day questions during rounds that have no clear answers in the current medical literature into study designs, perform the modeling and the analysis and publish their findings. The studies fall into the following broad categories: identification and interrogation of practice variation, predictive modeling of clinical outcomes within patient subsets and comparative effectiveness research on diagnostic tests and therapeutic interventions. Clinical databases such as MIMIC-II, where recorded health care transactions - clinical decisions linked with patient outcomes - are constantly uploaded, become the centerpiece of a learning system.

Understanding Entrepreneurial Process and Performance: A Cross-National Comparison of Alumni Entrepreneurship Between MIT and Tsinghua University

  • Eesley, Charles E.;Yang, Delin;Roberts, Edward B.;Li, Tan
    • Asian Journal of Innovation and Policy
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    • v.5 no.2
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    • pp.146-184
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    • 2016
  • This paper analyzes the major comparisons and contrasts in entrepreneurship among technology-based university alumni over multiple decades from Tsinghua University in China and the Massachusetts Institute of Technology in the United States. In doing so, we ask two related research questions: (1) Who enters entrepreneurship and with what types of ideas and founding teams? (2) How do the innovation and other firm performance outcomes compare? We find that the sources of venture ideas and the composition of founding teams differ as well as the initial capital levels and revenues. This research provides a step toward a better understanding of high-tech entrepreneurship in developing vs. developed institutional environments. Furthermore, while MIT and Tsinghua University are unique in the programs they offer and in their historical cultures of entrepreneurship, both Tsinghua University and MIT provide benchmarks by which other institutions can gauge their alumni entrepreneurs and the types of ventures that they create.

Physicochemical Properties of Traditional Liquor with Different Brewing Method of Mit-sool (밑술 담금 방법을 달리한 전통주의 이화학적 특성)

  • Chung, Rak-Won
    • Journal of the Korean Society of Food Culture
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    • v.30 no.3
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    • pp.377-386
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    • 2015
  • The purpose of this research was to appraise physicochemical properties by utilizing different Mit-sool, Juk, Seolgi-tteok, and Godubap, to produce traditional liquor. In all experimental plots, pH and amino acidity tended to increase with duration of fermentation. Titratable acidity displayed a very high number on the second day but then tended to decrease as fermentation progressed. Sugar contents were highest on the fourth day and tended to decrease with time. Alcohol content increased sharply at the initial stage of fermentation and increased gradually. On the 15th day, traditional liquor made with Godubap recorded the highest alcohol content. Common free sugar components were glucose and sorbitol. Common free organic acid components were lactic, succinic, citric, tartaric, malic, and acetic acids. Volatile flavor compounds were six alcohols, five esters, three aldehydes, and two ketones. Regarding overall acceptability in the sensory evaluation, traditional liquor using Seolgi-tteok as Mit-sool scored the highest. Overall, even though different types of Mit-sool had different physicochemical properties, there were no significant differences in volatile flavor compounds or sensory evaluation scores.

Technique for the ECG Bio-sounds Visualization Analysis Based on the MIT-BIH Database (MIT-BIH 데이터베이스 기반 ECG 생체신호 시각화 분석을 위한 기술)

  • Kim, Jong-Wook;Lee, Myoung-Jin;Ko, Kwang-Man;So, Kyoung-Young
    • Journal of Digital Contents Society
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    • v.17 no.2
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    • pp.97-103
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    • 2016
  • This work introduces techniques experienced for the electrocardiogram(ECG) visual analysis, able to characterize the major parameters and events with clinical relevance for heart failure management and cardiovascular risk assessment. In particular, it includes approaches for ECG data visual processing such as the variable charts, graphs base on the complex MIT-BIH ECG database. Through the experienced this works of ECG database visualization, so many researcher more easily access the complex ECG database and can intuitionally understand the meanings via a variable ECG visualized data.

Die Bestimmung von Spurenelementen in Naturlichen Wassern durch Rontgenfluoreszenzspektrometrie nach Kontinuierlicher Dithizonextraktion mit Hilfe der Pulsationskolone (Ⅱ) (X-線 螢光分析에 依한 天然水中의 微量金屬定量 [II] 連續 液-液 抽出에 依하여)

  • Yung Kyu Park
    • Journal of the Korean Chemical Society
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    • v.13 no.1
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    • pp.45-48
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    • 1969
  • Spuren von Blei und Zink werden aus großen Wassermengen mit benzolischer Dithizonlosung in einer Pulsationskolonne durch kontinuirliche Flussig-Elussig-Extraktion angereichert. Nach der Extraktion wird das Benzoly-peroxid oxydiert und die Spurenelemente durch verdunnte Salzsaure zuruckextrahiert. Die angereicherten Metalle werden durch Einleiten von Schwefelwasserstoff aus der Losung bei pH 8 unter Zusatz von Aluminium Trager ausgefallt. Die Niederschlage der Metallsufide werden durch Membranfilter filtriert, mit Gelatine fixiert und ihre Absolutmengen durch Rontgenfluoreszenzanalyse bestimmt. Blei wird bei einer Konzentration von 2.5 bis 100 p.p.b. mit einer relativen Standardabwechung von 9.0% und Zink bei einer Konzentration von 2.5-100 p.p.b. mit einer relativen Standardabwechung von 10.3% gemesssen.

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Multivariate Mean Inactivity Time Functions with Reliability Applications

  • Kayid, M.
    • International Journal of Reliability and Applications
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    • v.7 no.2
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    • pp.127-140
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    • 2006
  • AIn this paper we introduce and study a multivariate notions of mean inactivity time (MIT) functions. Basic properties of these functions are derived and their relationship to the multivariate conditional reversed hazard rate functions is studied. A partial ordering, called MIT ordering, of non-negative random vectors is introduced and its basic properties are presented. Its relationship to reversed hazard rate ordering is pointed out. Finally, using the MIT ordering, a bivariate and multivariate notions of IMIT (increasing mean inactivity time) class is introduced and studied.

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MIT의 복합재료 연구현황

  • 김병선;어재혁
    • Composites Research
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    • v.15 no.4
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    • pp.43-48
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    • 2002
  • This paper presents the brief description of Composite Materials Research carried out at Massachusetts Institute of Technology (MIT). The researches regarding Composites are performed at four Departments, they are Laboratory for Manufacturing & Productivity (LMP) within Mechanical Engineering Department, Technology Laboratory for Advanced Composites (TELAC) within Aerospace Engineering Department, Structures & Materials Program within Civil & Environmental Engineering Department and Building Technology Program within Department of Architecture.