نتایج جستجو برای: thermal variable measurement

تعداد نتایج: 890828  

Journal: :international journal of nano dimension 0
a. l. subramaniyan department of physics, thiagarajar college of engineering, madurai, tamilnadu, india. g. kumaraguruparan department of mechanical engineering,thiagarajar college of engineering, madurai, tamilnadu, india. r. venkatesan department of mechanical engineering,thiagarajar college of engineering, madurai, tamilnadu, india. a. vignesh department of mechanical engineering,thiagarajar college of engineering, madurai, tamilnadu, india.

nanofluids are gaining much importance over the past decade due to their enhanced thermal conductivity, specific heat, cooling capacity, electrical conductivities. novel properties of nanofluids are yet to be explored to the highest potential applications. one of the prominent applications of nanofluids is in thermal conduction. the presence of nanoparticle in a fluid can enhance the thermal co...

Journal: :Applied optics 2003
Julien Moreau Vincent Loriette Albert-Claude Boccara

We describe an instrument for measuring the magnitude of birefringence of tomographic images and the principal directions of axes that use thermal-light polarization-sensitive optical coherence tomography. The instrument permits full-field measurements with an axial resolution of 1.5 microm and a transverse resolution limited by diffraction. We obtained a sensitivity of 84 dB, limited by shot n...

2009
Y. Chen T. Nguyen L. C. Zhang

This investigation aims to develop a quantitative model to estimate the material removal of polycrystalline diamond composites (PCDCs) by dynamic friction polishing. The model accounts for the contributions from the constitutive characteristics and thermal properties of the materials and the key polishing parameters. It was found that the material removal was dominated by six dimensionless vari...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه صنعتی اصفهان - دانشکده مهندسی مکانیک 1387

سیالات پایه، مانند آب، ضرایب رسانایی ضعیفی داشته و این یکی از مشکلات سیالات به عنوان سیال عامل می باشد. نانوسیالات، مخلوطهای رقیق نانو ذرات در آب، بر اساس نتایج آزمایشات ضرایب رسانایی گرمایی بسیار بالاتری در مقایسه با سیالات معمولی دارند و می توانند جایگزین مناسبی برای کارکردهای گرمایی باشند. افزودن نانو ذرات از جهات بسیاری در خواص سیال پایه تغییراتی به وجود می آورد. این تفاوت ها با تیوری های م...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه صنعتی اصفهان - دانشکده مهندسی شیمی 1386

نانوسیال یا سوسپانسیون ذرات نانو، نام یک ماده جدید مهندسی است که ادعا می شود هدایت حرارتی بالاتری نسبت به سیال پایه دارد و از معلق سازی ذرات نانو در سیال پایه به دست می آید. سیالات پایه هدایت حرارتی پائینی دارند و همواره محققان به دنبال راهی برای جبران این نقص بوده اند. از جمله سیالات پایه می توان به آب، اتیلن گلیکول یا ضد یخ و انواع روغن ها اشاره کرد که در ادوات صنعتی به وفور از آنها به عنوان ...

2012
Charles-A. Darveau Eric B. Taylor Patricia M. Schulte

In northern Canada, lake chub (Cyprinidae: Couesius plumbeus) have colonized a variety of thermal springs that differ substantially from the ancestral environment in both mean temperature and thermal variation. To examine whether this environmental change is associated with differences in physiological traits, we compared the thermal breadth, capacity for acclimation of thermal tolerance, and m...

2002
Hiroyuki Kamiya Go Watanabe Tateo Saito Toshio Doi Shigeyuki Tomita Hiroshi Ohtake Taro Kanamori

Objectives: There has been no method which can measure regional myocardial blood flow in real-time and continuously. The purpose of this study was to validate myocardial blood flow measurement using a thermal diffusion method. For this purpose, myocardial blood flow measurement was performed using the thermal diffusion method and the electrolytic hydrogen clearance method. Methods: Seven pigs w...

2016
Changzheng Li Shen Xu Yanan Yue Bing Yang Xinwei Wang

Most conventional Raman thermometry for thermal properties measurement is on steady-state basis, which utilizes either Joule heating effect or two lasers configurations coupled with increased complexity of system or measurement uncertainty. In this work, a new comprehensive approach including both transient and steady-state Raman method is proposed for thermal properties measurement of micro/ n...

2002
Shinji Shimizu Noboru Imai

The spindles speed and feed rate of machine tools increase greatly to realize high-productivity with high accuracy. This leads to exceeding increase in heat generation and then the thermal deformation of the machine tools become serious problems. Therefore it makes necessary to measure and evaluate the thermal deformation. With these points as background, measuring methods for thermal deformati...

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