رسالة مدير الموقع :
حقق موقع التقنية خلال الاعوام الخمسة الماضية انتشار واسعاً في العالم العربي ، وهذا الانتشار هو
بالتالي انتشار للثقافة التقنية والهندسية بين أوساط الشباب العربي. كما
انه ساهم بشكل كبير في اثراء المحتوى العربي في تخصصات الهندسة والتقنية
على الانترنت.
ولهذا يهدي موقع التقنية نجاحه لكل من ساهم فيه بأي شكل من الاشكال. وهدفنا
ان نكون بوابة عربية ندخل من خلالها الى أفاق اوسع في نشر المعلومة
الهندسية التقنية الكترونيا وبدون أدنى تكلفة. شكرا لكل محبي موقع التقنية.
Une des contraintes majeure intervenant dans la conception d’un véhicule hypersonique est liée à l’échauffement de la paroi. , qui est du ssentiellement à la présence de chocs forts au sein de l’écoulement , la dissipation visqueuse dans les couches limites et les effets de hermochimie. L’importance de la différence de température entre la paroi et l’écoulement est source de flux de chaleur internes, transmis en partie à la paroi à travers la couche limite . ce livre est très important pour les ecoulements hypersonique Hypersonic Aerothermodynamics
al salame alikoum bonjour
Le vortex est un phénomène qui apparait en bout d'aile. Il est principalement due au fait que la surpression tend à aller vers la dépression. Il est source d'une trainée suplémentaire qui déteriore les performance en vol
السلام عليكم ورحمة الله وبركاته اليكم هذا الكتاب بعنوان
Solar-Type Activity in Main-Sequence Stars
Solar-type activity in main sequence Stars, (Astronomy & astrophysics library)
Auteur(s) : GERSHBERG R. Date de parution: 06-2005 Langue : ANGLAIS 450p.
RésuméSolar-type activity over the whole range of the electromagnetic spectrum is a phenomenon inherent in the majority of low- and moderate-mass main sequence stars. In this monograph observational results are summarized in a systematic and comprehensive fashion. The analysis of the various manifestations of such stellar activity leads to the identification of these phenomena with macroscopic non-linear processes in a magnetized plasma. Comparative study of flare stars and the Sun has become increasingly fruitful and is presently an active field of research involving stellar and solar physicists, experts in plasma physics and high-energy astrophysicists. This book will provide them with both an introduction and overview of observational results from the first optical photometry and spectroscopy, from the satellite telescopes International Ultraviolet Explorer to Hubble Space Telescope, XMM-Newton and Chandra, as well as with the present physical interpretation of solar-type activity in main sequence stars. Gershberg's 40-year career studying UV Cet type stars and related objects enables him to provide readers with expert insight into the characteristics of such stars in both the quiescent state and during flares and the reliability of the data over the electromagnetic spectrum and wide temporal scales. SommaireIntroduction.- Flare Stars in a Quiescent State: General Characteristics of Flare Stars.- Photospheres.- Chromospheres and Transition Regions.- Coronae and Stellar Winds.- Heating Mechanisms for Stellar Atmospheres.- Flares: General Description of Stellar Flares.- Temporal Characteristics of Flares.- Flare Energy.- Dynamics and Radiation Mechanisms of Flares.- Models of Stellar Flares.- Long-Term Variations in Activity of Flare Stars: Activity Cycles.- Evolutionary Changes.- Conclusion: Activity and Subphotospheric Magnetic Fields.- Activity and Magnetism of Stellar Atmospheres.- References.
السلام عليكم ورحمة الله وبركاته اليكم هذا الكتاب الجميل بعنوان
Aerothermodynamics of Aircraft Engine Components
Book Description:
Design and R&D engineers and students will value the comprehensive, meticulous coverage in this volume, which, under the expert editorial supervision of Gordon C. Oates, features the invited work of prominent specialists in aircraft gas turbine engines. Beginning with the basic principles and concepts of aeropropulsion combustion, chapters explore specific processes, limitations, and analytical methods as they bear on component design.
aerodynamics
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