Research and Analysis of a Micro EDM System

Micro Electrical Discharge Machining is currently widely used in the manufacturing in a variety of applications, like in the production of micro parts for watches, keyhole surgery, housings for micro surgery, and also tooling inserts for fabrication of micro filters. This study is undertaken with the objective of analyzing various methods of Micro EDM setup and factors and parameters which affect the end product quality and process and to also propose design parameters for production of micro channels with bio-applications. . A brass tube electrode is selected with multiple passes with a resetting of Z-coordinate used as wear compensation method. A R-C generator with 75Vand 0.5A with a pulse on time of 12us is selected to give the best balance between MRR and accuracy. Lastly, de-ionized water is used as a dielectric fluid because its chemically inert and will not pollute the micro channel which is to be used in bio-applications as well as provide a stable MRR

Synthesis and Characterization of ZnSe1-xTex Alloy Thin Films Deposited by Electron Beam Technique

ZnSe1-x Tex solid solutions were prepared and films were deposited on glass substrates with x 0.2, 0.4, 0.6 and 0.8. DTA/TGA analysis was carried out to study the alloy formation temperature. Structural studies by XRD results showed the polycrystalline nature of the films. The Full Width at Half Maximum (FWHM) values were observed from the XRD pattern and used to evaluate the microstructural parameters like crystallite size, strain, dislocation density and stacking fault density for all the films with x 0.2, 0.4, 0.6 and 0.8. These films were coated with a thickness of about 200 nm on glass substrates keeping the temperature constant at 200 C. All films showed cubic structure and the lattice parameter values are found to vary with „X‟. This confirms the solid solution formation between the ZnSe and ZnTe binary compounds which are found to obey Vegard‟s law. SEM and AFM studies have been arried out to observe their surface modification with solid solution formation. Raman studies confirm the formation of ZnSe1-xTex compound films. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3501

Preparation and properties of zinc doped cadmium selenide compounds by e-beam evaporation

Cd1 – xZnxSe films with different zinc content were deposited by electron beam evaporation technique onto glass substrates for the application of solid-state photovoltaic devices. The structural, surface morphological and optical properties of Cd1 – xZnxSe films have been studied in the present work. The host material, Cd1 – xZnxSe, have been prepared by the physical vapor deposition method of electron beam evaporation technique (PVD: EBE) under a pressure of 1 10 – 5 mbar. The X-ray diffractogram indicates that these alloy films are polycrystalline in nature, hexagonal structure with strong preferential orientation of the crystallites along (002) direction. Linear variation of lattice constant with composition (x) is observed. The optical properties shows that the band gap (Eg) values varies from 2.08 to 2.64 eV as zinc content varies from 0.2 to 0.8. The surface morphological studies show the very small, fine and hardly distinguishable grains smeared all over the surface. It is observed that the grain size is decreasing with increasing zinc content. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/2299

Bilateral temporomandibular joint dislocation in a 29-year-old man: a case report

Introduction A dislocation of the temporomandibular joint represents three percent of all reported dislocated joints. The treatment entails reduction of the deformity and this can often be achieved in a ward setting. Case presentation We present the case of a 29-year-old Caucasian man with a non-traumatic bilateral anterior temporomandibular joint dislocation. Following several unsuccessful attempts, due to both inadequate patient analgesia and sedation, joint reduction had to be performed in theatre with the patient under general anesthesia. Conclusion This case highlights the importance of providing the patient with adequate analgesia and sedation when attempting the reduction of temporomandibular joint dislocations

Research and Analysis of a Micro EDM System

Micro Electrical Discharge Machining is currently widely used in the manufacturing in a variety of applications, like in the production of micro parts for watches, keyhole surgery, housings for micro surgery, and also tooling inserts for fabrication of micro filters. This study is undertaken with the objective of analyzing various methods of Micro EDM setup and factors and parameters which affect the end product quality and process and to also propose design parameters for production of micro channels with bio-applications. . A brass tube electrode is selected with multiple passes with a resetting of Z-coordinate used as wear compensation method. A R-C generator with 75Vand 0.5A with a pulse on time of 12us is selected to give the best balance between MRR and accuracy. Lastly, de-ionized water is used as a dielectric fluid because its chemically inert and will not pollute the micro channel which is to be used in bio-applications as well as provide a stable MRR

Biotransformation of Trichloroethene by a Mixed Culture of Nitrifying Bacteria

School of Civil and Environmental Engineerin