نتایج جستجو برای: scaling constants

تعداد نتایج: 118273  

2017
Elizabeth A. Silber Gordon R. Osinski Brandon C. Johnson Richard A. F. Grieve

We use numerical modeling to investigate the combined effects of impact velocity and acoustic fluidization on lunar craters in the simple-to-complex transition regime. To investigate the full scope of the problem, we employed the two widely adopted Block-Model of acoustic fluidization scaling assumptions (scaling block size by impactor size and scaling by coupling parameter) and compared their ...

Journal: :European Physical Journal Plus 2021

The aim of this paper is to present a new approach construct constants motion associated with scaling symmetries dynamical systems. Scaling maps could be the equations but not its Lagrangian action. We have constructed Noether inspired theorem in vertical extended space that can used obtain for these symmetries. obtained as particular case our construction. To illustrate how procedure works, we...

2014
Mitsuharu Yagi Shin Oikawa

Size-scaling metabolism is widely considered to be of significant importance in biology and ecology. Thus, allometric relationships between metabolic rate (VO2) and body mass (M), VO2 = a(i)Mb, have long been a topic of interest and speculation. It has been proposed that intraspecifically metabolic rate scales isometrically or near isometrically with body mass during the early life history in f...

2005
A.J.E.M. Janssen Peter L. Søndergaard

In this paper we investigate the computational aspects of some recently proposed iterative methods for approximating the canonical tight and canonical dual window of a Gabor frame (g, a, b). The iterations start with the window g while the iteration steps comprise the window g, the k iterand γk, the frame operators S and Sk corresponding to (g, a, b) and (γk, a, b), respectively, and a number o...

Journal: :journal of lasers in medical sciences 0
reza birang department of periodontology, torabinejad dental research center, school of dentistry, isfahan university of medical sciences, isfahan, iran jaber yaghini department of periodontology, dental implants research center, school of dentistry, isfahan university of medical sciences, isfahan, iran naeimeh nasri departments of oral and maxillofacial radiology, school of dentistry, isfahan university of medical science, isfahan, iran nasim noordeh dental student’s research center, school of dentistry, isfahan university of medical sciences, isfahan, iran pedram iranmanesh department of endodontics, school of dentistry, isfahan university of medical science, isfahan, iran alireza saeidi dental student’s research center, school of dentistry, isfahan university of medical sciences, isfahan, iran

introduction: periodontitis is an inflammatory periodontal disease that leads to tooth loss. recently laser has been introduced as an alternative treatment for periodontitis. the aim of the present study was to compare the effect of erbium-doped yttrium aluminum garnet (er:yag) laser with ultrasonic scaler in patients with moderate chronic periodontitis. methods: in this randomized single-blind...

Journal: :iranian journal of microbiology 0
reyhameh noormohamadi department of industrial and environmental biotechnology, national institute of genetic engineering and biotechnology (nigeb), tehran, iran and department of chemical engineering, science and research branch, islamic azad university, tehran, iran. fatemeh tabandeh department of industrial and environmental biotechnology, national institute of genetic engineering and biotechnology (nigeb), tehran, iran. parvin shariati department of industrial and environmental biotechnology, national institute of genetic engineering and biotechnology (nigeb), tehran, iran. maryam otadi department of chemical engineering, science and research branch, islamic azad university, tehran, iran.

background and objectives: lipases are valuable biocatalysts which are widely used in the detergent, food, dairy and pharmaceutical industries. the aims of the present study included the isolation of a lipase-producer from industrial zones and the partial characterization of the enzyme. materials and methods: a number of bacteria were isolated from sites related to the oil industries. an isolat...

2001

theory is based on simple physical considerations that large length scale polymer properties must provide universal laws embodying the long chainlike character of polymers. These laws are represented in terms of scaling laws and their generalization to the important regions of intermediate excluded volume where the power law exponents are no longer universal constants. A motivation is provided ...

Journal: :The Journal of chemical physics 2005
Anna Pomyalov David J Tannor

The calculation of chemical reaction rates in the condensed phase is a central preoccupation of theoretical chemistry. At low temperatures, quantum-mechanical effects can be significant and even dominant; yet quantum calculations of rate constants are extremely challenging, requiring theories and methods capable of describing quantum evolution in the presence of dissipation. In this paper we pr...

2011
Adrian J. de Nijs Edcel J. Salumbides Kjeld S. E. Eikema Wim Ubachs Hendrick L. Bethlem

UV-frequency metrology has been performed on the a3 X1 + (0,0) band of various isotopologues of CO using a frequency-quadrupled injection-seeded narrow-band pulsed titanium:sapphire laser referenced to a frequency comb laser. The band origin is determined with an accuracy of 5 MHz (δν/ν = 3 × 10−9), while the energy differences between rotational levels in the a3 state are determined with an ac...

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