نتایج جستجو برای: near work
تعداد نتایج: 1182455 فیلتر نتایج به سال:
In this work, the effects of inner radius and width variation on energy spectrum and persistent current in hexagonal graphene quantum rings with zigzag edges have been studied by using the tight-binding model. Our investigation show that the energy spectra of these rings are grouped into subbands which each one consists of six coupled energy levels that separated by energy gaps. The pattern o...
Living near high-voltage power lines and exposure to high-frequency electromagnetic fields (EMFs) is a potential serious hazard to animal and human health. The present study was carried out to evaluate the effect of high-frequency EMFs from simulated high-voltage electric towers on cognitive, anatomical, and biological changes in male Macaque. In this study, two Rhesus Macaque were recruited, ...
The main objective of this work was to design a novel device for compaction of metal powders so that the green parts could be ejected with applying a negligible force and without the need for any lubricant in either an admixed form or applied to the die wall. For this purpose a 40 mm diameter one-piece die was envisaged which would elastically contracted 0.076 mm before compaction and after com...
from philosophical , structure, form of architecture and ornaments point of view, Minarets are one of the key elements of Islamic architecture that need to be researched and contemplated in these four areas. In Iran, Building minarets as a mean of spiritual guidance started before Islam and reached to its peak in Seljuk period. This structure was first built near important routes, plains, insid...
Fusional vergence dysfunction is a binocular condition that is relatively easy to diagnose and treat but is often overlooked. FVD can negatively impact an individual’s ability to function, particularly when performing near work. A 17-year-old white female presented to our clinic with visual symptoms associated with sustained near work. The findings were characterized by normal phorias, poor but...
We describe nearly linear-time approximation algorithms for explicitly given mixed packing/covering and facility-location linear programs. The algorithms compute (1+ǫ)-approximate solutions in time O(N log(N)/ǫ), where N is the number of non-zeros in the constraint matrix. We also describe parallel variants taking time O(polylog /ǫ) and requiring only near-linear total work, O(N polylog /ǫ). Th...
در این تحقیق، 3-آمینو پروپیل ساپورت شده برروی سطح سیلیکا ((ap-sio2 بعنوان کاتالیزوری بازی موثر و قابل بازیافت برای واکنش افزایشی مایکل فسفیت استر ها به مالونیت های غیر اشباع در شرایط بدون حلال معرفی می شود. work-up ساده، بازیافت آسان کاتالیزور، شرایط ملایم واکنش، عدم تشکیل محصولات جانبی از مزایای این روش برای سنتز تعداد زیاد و متنوعی از بتا- فسفونومالونیت ها با راندمان های بالا و در زمانهای کوت...
زمینه و هدف: تغییرات ایجاد شده در واحد عملکردی عضله-استخوان در زنان یائسه ی استئوپروتیک، تغییراتی را در استراتژی های کنترلی به همراه خواهد داشت. هدف مطالعه ی حاضر بررسی قدرت عضلات و شاخص های پایداری ایستا، پویا و عملکردی در زنان یائسه ی استئوپروتیک و مقایسه آن با زنان یائسه غیر استئوپروتیک (سالم و استئوپنیک) بود. روش کار: 71 زن یائسه ی داوطلب (48-65 سال) بر حسب score-t به سه گروه سالم، استئوپن...
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