1,721,006 research outputs found
Low frequency radio frequency identification antenna design
No full textProject (M.S., Electrical and Electronic Engineering) -- California State University, Sacramento, 2011.Many household pets today have a radio frequency identification chip implanted by their owners. These devices operate as a passive device in the low frequency range, because they are passive the power received back is very small and utilize inductive coupling to power them. The distance at which these devices can be read effectively is very small because they are operating in low frequency range and require inductive coupling. Increasing the range these radio frequency identification devices can be effectively read will open up many types of automated applications to work with existing technology implanted in household pets. This project will explore the parameters of a loop antenna in the operation of activating and reading a low frequency radio frequency identification device with the intent of maximizing the effective range trying to reach a range of nine inches or more.\ud
Most of the back ground and history of radio frequency identification technology was researched from online journals and articles. As more detailed information was obtained, iEEE articles and industry techniques were researched. Antenna theory and operation were pulled from industry leading text books imploring antenna concepts and electromagnetic signal transmissions.\ud
The resulting antenna created through this project did exceed the effective read range and area of the existing premade antenna. However the effective read distance did not exceed the previous set goal of nine inches. Other techniques and antenna designs are described but not detailed within this project.Electrical and Electronic Engineerin
Clinically amyopathic dermatomyositis: case report and review of the literature
No full textClinically amyopathic dermatomyositis (CADM) is an autoimmune disease characterized by the presence of skin lesions typical of dermatomyositis and absent/low muscle involvement. One case of hypomyopathic dermatomyositis with early rapidly progressive interstitial lung disease in a 52-year old woman with fever, erythematous desquamating skin rash, arthralgia and pulmonary consolidation is here reported. The rapid progressive interstitial lung disease caused the patient‘s death, despite immunosuppressive treatmen
The interlink between thyroid autoimmunity and type 1 diabetes and the impact on male and female fertility
No full text: The aim of this review is to discuss the several interconnections between thyroid autoimmunity and type 1 diabetes in terms of epidemiology, immunoserology, genetic predisposition, and pathogenic mechanisms. We will also analyze the impact of these conditions on both male and female fertility. A literature search was carried out using the MEDLINE/PubMed, Scopus, Google Scholar, ResearchGate, and Clinical Trials Registry databases with a combination of keywords. It was found that the prevalence of thyroid autoantibodies in individuals with type 1 diabetes (T1DM) varied in different countries and ethnic groups from 7 to 35% in both sexes. There are several types of autoantibodies responsible for the immunoserological presentation of autoimmune thyroid diseases (AITDs) which can be either stimulating or inhibiting, which results in AITD being in the plus phase (thyrotoxicosis) or the minus phase (hypothyroidism). Different types of immune cells such as T cells, B cells, natural killer (NK) cells, antigen presenting cells (APCs), and other innate immune cells participate in the damage of the beta cells of the islets of Langerhans, which inevitably leads to T1D. Multiple genetic and environmental factors found in variable combinations are involved in the pathogenesis of AITD and T1D. In conclusion, although it is now well-known that both diabetes and thyroid diseases can affect fertility, only a few data are available on possible effects of autoimmune conditions. Recent findings nevertheless point to the importance of screening patients with immunologic infertility for AITDs and T1D, and vice versa
The Burden of Interstitial Lung Involvement in Rheumatoid Arthritis: Could Lung Ultrasound Have a Role in Its Detection? A Literature Review
Full text linkLung involvement represents a fearful complication in rheumatoid arthritis (RA), potentially involving all compartments of the pulmonary system. Regarding interstitial lung disease (ILD), the HRCT represents the gold standard technique for its diagnosis; however, the examination is burdened by radiation exposure and high costs. In addition, although some risk factors for ILD are known, no algorithms exist to know which patients to submit to HRCT and when. In this context, lung ultrasound (LUS) showed promising results for at least 10 years, demonstrating correlation with high resolution computed tomography (HRCT) findings in other rheumatic diseases. Here, LUS may represent a screening test providing additional information to clinical examination and pulmonary function tests. The data deriving from LUS experience in other rheumatic diseases could steer the future towards the use of this technique also in RA patients, and in this review, we report the most relevant literature regarding LUS in RA-ILD
Simulation and analysis of simple electromagnetic structures with practical applications and presentation of electromagnetic concepts
No full textIn this project, simulations of simple electromagnetic structures have been performed. Inductive loop sensors and ball grid array structures have been analyzed using 3D and 2D full-wave electromagnetic simulators along with scientific calculation software. Fundamental electromagnetic concepts are presented and electromagnetic structures are simulated and analyzed. Applications of these structures are presented. The characteristics of these applications are compared to published data
Active transistor mixer
No full textProject (M.S., Electrical and Electronic Engineering) -- California State University, Sacramento, 2011.Wireless applications create special needs for mixers. Over the age, mixer technology has evolved from a major research topic into one of great maturity. Diode mixers are now well understood and diode mixers exhibiting excellent performance over multioctave bandwidths are commonly available at a lower cost. However, active mixers have special advantages in minimizing the complexity of a system or in reducing noise or intermodulation distortion. \ud
The main aim of this project is to design a single stage active transistor mixer in RF frequency range. Circuit implementation and simulations were carried out in Agilent, ADS (Advance Design System). Various mixer design issues including the nonlinear behavior of transistors were covered and dealt with while designing the single stage transistor mixer. ADS simulations were carried out on Infineon BFP640 transistor and also on Infineon BFP620 transistor .Further, circuit implementation was carried out on board using the BFP620 transistor and measurements were done using available measurement hardware systems in the Microwave laboratory at California State University, Sacramento and at Centellax Inc , Santa RosaElectrical and Electronic Engineerin
Development of a prototype automated radiochemistry system for reactor production of Copper-64
No full textA prototype automated radiochemistry system to separate copper and zinc was developed and tested as a proof of concept using off-the-shelf modular pieces. A graphical user interface was developed to provide a manual interface to all modular devices for functionality tests, calibration, and user definable automated routines. The testing validated the automated control of the chemical copper-zinc separation process using water instead of the needed chemicals
Development of a prototype automated radiochemistry system for reactor production of Copper-64
No full textProject (M.S., Electrical and Electronic Engineering)--California State University, Sacramento, 2014.A prototype automated radiochemistry system to separate copper and zinc was developed and tested as a proof of concept using off-the-shelf modular pieces. A graphical user interface was developed to provide a manual interface to all modular devices for functionality tests, calibration, and user definable automated routines. The testing validated the automated control of the chemical copper-zinc separation process using water instead of the needed chemicals.Electrical and Electronic Engineerin
- …
