نتایج جستجو برای: شاخصهاى دیرینه تراز psi
تعداد نتایج: 14178 فیلتر نتایج به سال:
THE elastic and mechanical properties of dentin were studied as early as 1895 by Black' who measured the compressive strengths of cubes of dentin and reported that a cube, 0.08 inch square, had an average compressive strength of 37,200 psi and an elastic deformation of 2.09 per cent when subjected to a load of 100 pounds (elastic modulus 0.8 x106 psi). Peyton, Mahler, and Hershenov2 reported av...
به منظور بهبود فرآیند یادگیری و تثبیت آموختهها، توجه به تفاوتهای فردی فراگیران الزامی است. نظام آموزش فردی (PSI) یکی از روشهای آموزشی است که به روشنی تفاوتهای فردی یاد گیرنده را لحاظ مینماید. در این پژوهش کیفیت یادگیری فیزیک را با نظام آموزش فردی و نظام آموزش سنتی مورد مقایسه قراردادیم. بدین منظور، طرح درس مبتنی بر PSI برای مبحث انتخابی از کتاب درسی فیزیک پایه دوم متوسطه طراحی شد. برای ن...
We define tropical Psi-classes on M 0,n (R 2 , d) and consider intersection products of Psi-classes and pull-backs of evaluations on this space. We show a certain WDVV equation which is sufficient to prove that tropical numbers of curves satisfying certain Psi-and evaluation conditions are equal to the corresponding classical numbers. We present an algorithm that generalizes Mikhalkin's lattice...
Seven zinc oxide-eugenol cements with compressive strengths from 200 psi to 8,000 psi were used for temporarily cementing completed inlays, crowns, and bridges. The effectiveness of each cement in a variety of clinical situations is presented. Cement of 1,000 psi met the requirements of typical clinical cases most frequently. The cements of compressive strength 200, 400, 600, 2,200, and 3,500 p...
We report the first observation of the decay J/psi-->3gamma. The signal has a statistical significance of 6sigma and corresponds to a branching fraction of B(J/psi-->3gamma)=(1.2+/-0.3+/-0.2)x10;{-5}, in which the errors are statistical and systematic, respectively. The measurement uses psi(2S)-->pi;{+}pi;{-}J/psi events acquired with the CLEO-c detector operating at the CESR e;{+}e;{-} collider.
Wild yeast harbour a variety of distinct amyloid structures with strong prion-inducing capabilities.
Variation in amyloid structures profoundly influences a wide array of pathological phenotypes in mammalian protein conformation disorders and dominantly inherited phenotypes in yeast. Here, we describe, for the first time, naturally occurring, self-propagating, structural variants of a prion protein isolated from wild strains of the yeast Saccharomyces cerevisiae. Variants of the [RNQ⁺] prion p...
Porous silicon (PSi) is an excellent material for biosensing due to its large surface area and its capability for molecular size selectivity. In this work, we report the experimental demonstration of a label-free nanoscale PSi resonant waveguide biosensor. The PSi waveguide consists of pores with an average diameter of 20nm. DNA is attached inside the pores using standard amino-silane and gluta...
Photosystem I (PSI) has drawn widespread interest for use in biomimetically inspired energy conversion devices upon extracting it from plants or cyanobacteria and assembling it at surfaces. Here, we demonstrate that a critically dense monolayer of spinach-derived PSI must be formed on an electrode surface to achieve optimal photocurrents, and we introduce a new method for preparing these dense ...
Keller’s Personalized System of Instruction dominated the literature in the teaching of psychology and behavior analysis in the 1970s and 1980s. After this brief flourish of interest, PSI research trickled off to a nearly imperceptible stream in the 1990s. However, with the increasing availability and ease of use of computers and the internet, along with demand created by an ever-growing need f...
Photosystem I (PSI) is one of the photosynthetic reaction centers that converts light energy into electrical and chemical energy. We report on two different experimental techniques to measure the open and closed circuit photovoltaic properties of PSI reaction centers in an aqueous environment. The combined techniques of atomic force microscopy and scanning surface probe microscopy were used to ...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید