نتایج جستجو برای: egr

تعداد نتایج: 2224  

Journal: :international journal of automotive engineering 0
a. paykani r. khoshbakhti saray m. mohammadi kousha t. shervani tabar

in this study, a numerical simulation using the cfd software, fluent, has been conducted to examine the effect of various shapes of the venturi component sections in order to find the optimum venturi specifications to increase the egr rate with minimum pressure loss at the part load operation range. the cfd results reveal that the venturi should be precisely optimized to introduce the required ...

Increasingly restrictive emission regulations and renewed focus on energy efficiency drive the current researches to find alternative fuels and their related better combustion strategies. In this regard, dual fuel engines, in which natural gas fuel is used as a main fuel and diesel fuel is employed as a pilot fuel, have received considerable attention. However, poor fuel utilization efficiencie...

Journal: :international journal of automotive engineering 0
a. mohebbi s. jafarmadar j. pashae

nitrogen oxides (nox) contribute to a wide range of environmental effects including the formation of acid rain and destroy ozone layer. in-cylinder high temperature flame and high oxygen concentration are the parameters which affect the nox emissions. the egr system is a very effective way for reducing nox emission from a diesel engine (via reduction of these parameters), particularly at the hi...

Journal: :Journal of cell science 2009
Sabine I Mayer Oliver G Rössler Takeshi Endo Patrick Charnay Gerald Thiel

Stimulation of astrocytes with epidermal growth factor (EGF) induced proliferation and triggered the biosynthesis of the transcription factor Egr-1, involving the activation of the extracellular signal-regulated protein kinase (ERK) signaling pathway. No differences in the proliferation rate of astrocytes prepared from wild-type or Egr-1-deficient mice were detected. However, expression of a do...

ژورنال: تحقیقات موتور 2015
حسینی, وحید, ریحانیان, مسعود, محبی, مصطفی,

ویژگی اصلی موتورهای اشتعال تراکمی (HCCI) کاهش شدید آلاینده NOx و PM همزمان با افزایش بازده و کاهش مصرف سوخت است. با این وجود به علت بازه کاری محدود و نبود راه‌های معین برای پایش زمان شروع احتراق کاربردهای این موتورها محدود مانده است. در این مطالعه از موتوری تک استوانه دیزلی با نسبت تراکم 19.3 برای احتراق در حالت HCCI استفاده شده است. بازه کاری در این مطالعه براساس λ و EGR تعریف شده است. ...

Journal: :Blood 2003
Rafal Pawlinski Brian Pedersen Bettina Kehrle William C Aird Rolf D Frank Mausumee Guha Nigel Mackman

In septic shock, tissue factor (TF) activates blood coagulation, and cytokines and chemokines orchestrate an inflammatory response. In this study, the role of Egr-1 in lipopolysaccharide (LPS) induction of TF and inflammatory mediators in vivo was evaluated using Egr-1(+/+) and Egr-1(-/-) mice. Administration of LPS transiently increased the steady-state levels of Egr-1 mRNA in the kidneys and ...

Journal: :The Journal of biological chemistry 1998
H von der Kammer M Mayhaus C Albrecht J Enderich M Wegner R M Nitsch

In order to search for genes that are activated by muscarinic acetylcholine receptors (mAChRs), we used an mRNA differential display approach in HEK293 cells expressing m1AChR. The zinc-finger transcription factor genes Egr-1, Egr-2, and Egr-3 were identified. Northern blot analyses confirmed that mRNA levels of Egr-1, Egr-2, and Egr-3 increased readily after m1AChR stimulation and that a maxim...

Journal: :E3S web of conferences 2022

In this paper, an experimental investigation on achieving ultra-low emissions in diesel engine was carried out using intake premixed methanol and EGR technology. The influence of introduction method combustion performances were studied comprehensively. results show that NOx (<0.4g/kWh) PM (<10mg/kWh) can be achieved simultaneously dual fuel (DMDF) highly low-temperature mode. Compared wit...

Journal: :Cancer research 2004
Makio Shozu Kouichi Murakami Tomoya Segawa Tadayuki Kasai Hiroshi Ishikawa Kazunori Shinohara Masahiko Okada Masaki Inoue

Expression of early growth response (Egr)-1, a transcriptional factor implicated in growth regulation, is suppressed in several malignant tumors. The present study investigated the expression of Egr-1 and related genes in uterine leiomyoma and normal myometrium to determine possible contributions of Egr-1 to neoplastic growth in leiomyoma cells. Levels of Egr-1 transcripts were decreased in all...

2004
Makio Shozu Kouichi Murakami Tomoya Segawa Tadayuki Kasai Hiroshi Ishikawa Kazunori Shinohara Masahiko Okada Masaki Inoue

Expression of early growth response (Egr)-1, a transcriptional factor implicated in growth regulation, is suppressed in several malignant tumors. The present study investigated the expression of Egr-1 and related genes in uterine leiomyoma and normal myometrium to determine possible contributions of Egr-1 to neoplastic growth in leiomyoma cells. Levels of Egr-1 transcripts were decreased in all...

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