نتایج جستجو برای: population balance
تعداد نتایج: 826341 فیلتر نتایج به سال:
مدل سازی توزیع اندازه ذرات در پلیمریزاسیون امولسیونی از نقطه نظر مطالعات مکانیزمی و کاربردی از اهمیت فراوانی برخوردار است. توسعه دینامیکی توزیع اندازه ذرات توسط مجموعه ای از معادلات موازنه جمعیت (population balance equations) که وقایع متعددی از جمله هسته زایی، رشد و انعقاد را در بر می گیرد، توصیف می شود. در این پژوهش مدلی مکانیزمی بر مبنای معادلات موازنه جمعیت (مدل صفر - یک) برای پیش بینی توزیع...
Population-based Incremental Learning is shown require very sensitive scaling of its learning rate. The learning rate must scale with the system size in a problem-dependent way. This is shown in two problems: the needle-in-a haystack, in which the learning rate must vanish exponentially in the system size, and in a smooth function in which the learning rate must vanish like the square root of t...
A theoretical model is developed to consider the effect of demulsifier agent on demulsification of water-in-crude oil emulsion. A thermodynamic approach is considered to correlate the critical micelle concentration of a demulsifier to the collision frequency function in population balance equation (PBE). Based on the proposed correlation, the collision frequency function is modified to account ...
Early researchers hoped to describe ball milling as a series of particle breakage and re-breakage events. This review reveals that needed input population balance modeling (PBM), the “breakage function,” was never intended be taken literally but assumed solve matrix calculations. Along with liquid-tracer–based residence time, rates each size class (the “selection function”) could then back-calc...
Quasispecies are clouds of genotypes that appear in a population at mutation-selection balance. This concept has recently attracted the attention of virologists, because many RNA viruses appear to generate high levels of genetic variation that may enhance the evolution of drug resistance and immune escape. The literature on these important evolutionary processes is, however, quite challenging. ...
saccharomyces cerevisiae (baker’s yeast) can exhibit sustained oscillations during the operation in a continuous bioreactor that adversely affects its stability and productivity. because of heterogeneous nature of cell populations, the cell population balance equation (pbe) can be used to capture the dynamic behavior of such cultures. in this work, an unstructured-segregated model is used for d...
Introduction: An increase of age may cause an obvious effect on physiologic systems which are involved in the balance function. It is estimated that 6% of health care costs are spent on unintentional injuries in elderly population. The aim of this study is to analyze the effect of Mini-trampoline training on dynamic balance abilities in the elderly subjects. Methods: During a clinical tri...
Background: Aging is a natural and physiological process. Moreover, balance disorders frequently occur in the elderly and cause many morbidities in this population. Objectives: The present study aimed to evaluate balance disorders and their related factors in the healthy elderly population of the rural areas of Guilan province, in the north of Iran. Materials & Methods: In this cross-section...
Population balance modeling has received an unprecedented amount of attention during the past few years from both academic and industrial quarters because of its applicability to a wide variety of particulate processes. In this article, a fresh look is taken of the basic issues of the application of population balances towards strengthening the approach as well as widening the scope of their ap...
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