46 research outputs found

    Quantum properties of d-wave YBaCaO Josephson junction

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    We have measured the transport properties of YBa2Cu3O7d (YBCO) dc SQUIDs with Josephson junctions characterized by a combination of 45 [00 1] tilt and a [100] tilt grain boundary with a = 0, ±10 and 45. By increasing the component of transport in the YBCO c-axis direction (increasing values of a), the SQUIDs showed an enhanced quality factor. At the same time, for all the devices the response under an external magnetic field presented the main features of an unconventional Josephson current phase relation with a pronounced sin2u component. Switching current measurements at low temperature (10th of mK) also revealed that the dynamics of grain boundary junction resulting from a combination of 45 [00 1] and 45 [100] tilt is dominated by macroscopic quantum tunnelling of the superconductive phase. The features are quite encouraging for applications of d-wave junctions in quantum circuitry

    Structures, enthalpies of formation, and ionization energies for the parent and binary mixed carbon, silicon, nitrogen, and phosphorus cubane derivatives: A G4MP2 theoretical study

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    Gas phase standard state (298.15 K, 1 atm) structures, enthalpies of formation, and ionization energies (IEs) were calculated at the G4MP2 composite method level of theory for the parent and binary mixed carbon, silicon, nitrogen, and phosphorus cubane derivatives. Increasing nitrogen content increases the enthalpies of formation for the carbon-nitrogen, nitrogen-phosphorus, and silicon-nitrogen binary cubanes, with the opposite enthalpies of formation trend for increasing phosphorus content within the carbon-phosphorus, nitrogen-phosphorus, and silicon-phosphorus derivatives. Varying carbon/silicon content in the carbon-silicon cubanes results in no general trends for enthalpies of formation. Isomerization enthalpies within the homolog groups having more than one isomer vary widely with atomic composition and substitution patterns. Increasing nitrogen content of the carbon-nitrogen and nitrogen-phosphorus derivatives increases the IE, increasing silicon content in the carbon-silicon cubanes and phosphorus content of the carbon-phosphorus cubanes decreases the IE, while no IE clear trends are evident based on relative atomic content for the silicon-nitrogen and silicon-phosphorus compounds. The binary mixed carbon, silicon, nitrogen, and phosphorus cubane derivatives are predicted to display potentially tunable thermodynamic stability and redox behavior depending on the atom identities and relative positions

    Spontaneous Mutation: A Sudden Change in the Evolution of the Written Description Requirement as It Applies to Genetic Patents

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    This Article examines the recent history of the ways in which the courts have applied the written description requirement to gene patents, with a particular focus on the changes in the law wrought by the July 2002 decision in Enzo Biochem, Inc. v. Gen-Probe Inc. The author begins by describing the written description requirement of 35 U.S.C. § 112 for a patent application. Then, the author discusses recent case law influencing the evolution of the written description requirement for patenting genetic material. Next, he discusses the decision in the first Enzo case, which seemed to follow established case law and articulated that an invention may not be described by its function in order to fulfill the written description requirement. However, the author goes on to discuss the second Enzo decision, in which the Court held that a patent may be described by its function if a known correlation between function and structure exists; the written description requirement may be satisfied by reference in the specification to a deposit of the genetic material in a public depository when the practical difficulties of describing the genetic material make a written description unavailable. These decisions were made relying upon patent guidelines rather than prior case law. The author concludes that this latest Enzo decision has shifted the direction of the development of the written description requirement for DNA patents, but has also created some uncertainty, such as whether litigants should rely on patent guidelines or previous case law

    Havening

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    Havening explores, through the creative nonfiction genre, the life and work of horticulturist-philosopher Liberty Hyde Bailey, Jr. (1858-1854), the life experiences of the present author, and the small hometown of South Haven that they both share. It presents the tension of living a life that strives to balance academicism with creativity and energy, and pushes the question of Bailey's relevance as a voice for our time. This monograph is primarily an artwork, not a scholarly paper.</p

    'n Ondersoek na die verbetering van produktiwiteit in die kleinhandel

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    Die rede waarom hierdie ondersoek gedoen is, is omdat daar nog baie min bekend is oor produktiwiteit 'n die kleinhandel in Suid-Afrika. Indien maksimum produktiwiteit in die kleinhandel bereik kan word, behoort dit 'n 'wesenlike bydrae te lewer om pryse in toom te hou. Die doel van die ondersoek was eerstens om deur middel van 'n literatuurstudie vas te stel: wat produktiwiteit is watter faktore fn invloed op produktiwiteit uitoefen hoe produktiwiteit gemeet kan word hoe produktiwiteit verbeter kan word in die kleinhandel Tweedens was die doelom deur middel van fn empiriese ondersoek -die produktiwiteit en produksie van verkoopspersone in 'n departementele winkel op verskillende maniere te meet -vas te stelof daar 'n beduidende verband bestaan tussen die produktiwiteit (en produksie) van verkoopspersone in 'n departementele winkel, aan die een kant, en die volgende biografiese gegewens (wat gewoonlik op aansoekvorms voorkom): huwelikstatus kinders (ja/nee) geslag ouderdom jare verkoopsondervinding jare diens by betrokke onderneming opvoedkundige kwalifikasie afstand van werk salaris Die metode: 'nStelsel om die verkope (geldwaarde) en aantal transaksies beklink van verkoopspersone te bepaal, is by die betrokke onderneming ingestel. Die biografiese gegewens is uit die persoonlike lêers verkry. Die verkoopsyfers en aantal transaksies is oor een jaar (Julie tot Junie) versamel. Een honderd agt en twintig verkoopspersone (wat almal minstens nege maande in diens was as verkoopspersone) se gegewens is gebruik. Die produktiwiteit (en produksie) van die individuele verkoopspersone is soos volg bereken: Metode 1: Waarde van verkope Salaris Metode 2: Waarde van verkope X aantal transaksies gemiddelde waarde van gemiddelde aantal verkope in afdeling transaksies in afdeling X gemiddelde salaris in afdeling X 100 eie salaries 1 Metode 3: Waarde van verkope X aantal transaksies gemiddelde waarde gemiddelde aantal van verkope in transaksies in afdeling afdeling Om te bepaal of die verkoopspersone se produktiwiteit en produksie, soos hier gemeet, 'n beduidende verband toon met hulle biografiese gegewens, is daar gebruik gemaak van die Chi-Kwadraat toets en t-toets. Belangrikste gevolgtrekkings en aanbevelings 1. Wat is produktiwiteit. Uit die literatuur blyk dit dat produktiwiteit die verhouding uitvoer tot invoer is, met ander woorde, hoe doelmatig en doeltreffend die invoere aangewend word om ‘n bepaalde uitvoer te verkry. 2. Die faktore wat produktiwiteit beinvloed. Dit blyk dat produktiwiteit deur ‘n verskeidenheid faktore beïn: vloed word, wat soos volg opgesom kan word: (a) Faktore in die persoon self (b) Faktote in die persoon se omgewing (c) Faktore in die werksituasie In die empiriese ondersoek is geen beduidende verband gevind tussen produktiwiteit van verkoopspersone in 'n afdelingswinkel en die biografiese gegewens ondersoek nie. Om die sukses van ‘n produktiwiteitsverbeteringsprogram te verseker moet daar op al hierdie faktore gelet word en nie net op sekeres nie. 3. Die meting van produktiwiteit. 'nVerskeidenheid for mules word in die literatuur voorgestel vir die meting van produktiwiteit, gewoonlik gebaseer op die een of ander benadering soos byvoorbeeld, finansieel, ekonomies of personeel. Hulle dui almal ‘n verhouding uitvoer tot invoer aan. Arbeidsproduktiwiteit in die kleinhandel word gewoonlik uitgedruk as die verhouding verkope tot arbeidskoste of verkope tot man-ure. Om individue van verskillende afdelings te kon vergelyk in die impiriese ondersoek, is korreksies aangebring vir die gemiddelde verkope, transaksies en salaris in elke afdeling. ,4. Die verbetering van produktiwiteit.Uit die literatuur blyk dit dat daar genoeg tegnieke bestaan wat in die kleinhandel gebruik kan word om produktiwiteit te verbeter. Die beste oplossing is waarskynlik om 'n kombinasie van die volgende tegnieke te gebruik: metodestudie werksmeting aanpassing van die verkoopspersoneel se persoonlike hoedanighede by dié van die klante keuring en opleiding aanpassing van personeelvoorsiening by klante-vloei en posverryking
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