با رشد سریع فناوری اطلاعات، تولیدکنندگان که در گذشته فقط به‌صورت سنتی و از طریق خرده‌فروشان محصولات خود را عرضه می‌کردند، می‌توانند مستقیم آنلاین نیز کنند. این پژوهش، یک زنجیره تأمین دو­کاناله شامل تولیدکننده خرده‌فروش نظر گرفته است آن می‌تواند دو کانال به فروش برساند. فرض می‌­شود محصول روش حمل درنتیجه زمان تحویل متفاوت ‌می‌کند قاعدتاً روی تقاضای یکدیگر تأثیر می‌گذارد. موردنظر ابتدا حالت غیرمتمر...

hydraulic fracturing (hf), as a stimulation technique in petroleum engineering, has made possible the oil production from reservoirs with very low permeability. the combination of horizontal drilling and multiple hf with various perforation angles has been widely used to stimulate oil reservoirs for economical productions. despite the wide use of hf, there are still ambiguous aspects that requi...

background &objectives; : high fat (hf) diet by affecting the oxidative stress and nitric oxide (no) production may lead to different effects on function of the heart after myocardial infarction (mi). in the present study we aimed to address the hypothesis that high release of no by activated macrophages affects lv function after mi. methods : the animals were randomly divided into four groups ...

heart failure (hf) is still a major problem worldwide with high morbidity and mortality rates. the recently developed medication for hf is still incapable of reducing its morbidity and mortality, and clinical data supporting the efficacy and safety of its mainstay therapy remain insufficient. arginine-vasopressin (avp) plays important roles in circulatory and water homeostasis, one of which is ...

Introduction: Dental ceramics are considered as materials that can restore the appearance of natural teeth. Etching the inner surface of a ceramic restoration with hydrofluoric acid (HF) followed by using a silane coupling agent is a well-known and recommended method to increase the bond strength. The aim of etching on ceramic structure is to enhance the surface roughness (Ra) and energy and to...

A cross-sectional comparative study was carried out to investigate the productive and reproductive performances of different genetic groups of crossbred cows at three different farming conditions in Bangladesh. Crossbred cows (n=90) those already completed third lactations, were selected randomly from three different dairy farms (e.g. Jarip, Mullah and Nahar) located in Chittagong, Bangladesh. ...

2014 As a sequel to a previous theoretical study of pressure induced lineshifts in the spectra of diatomic molecules pressurized by polar gases, some new experimental results became recently available and are reported in this paper. They concern the shifts in the HF(0-2) band due to HCl, and the HCl(0-1) and HCl(0-2) bands due to HF, for which predictions have been previously published. In the ...

Hydraulic fracturing (HF), as a stimulation technique in petroleum engineering, has made possible the oil production from reservoirs with very low permeability. The combination of horizontal drilling and multiple HF with various perforation angles has been widely used to stimulate oil reservoirs for economical productions. Despite the wide use of HF, there are still ambiguous aspects that requi...