In this paper, the design of a 9.1 GHz Low Noise Amplifier (LNA) of a RADAR receiver that is used in the Navy is presented. For the design of the LNA, we used GaAs Field-Effect Transistors (FETs) from Agilent ADS comp...In this paper, the design of a 9.1 GHz Low Noise Amplifier (LNA) of a RADAR receiver that is used in the Navy is presented. For the design of the LNA, we used GaAs Field-Effect Transistors (FETs) from Agilent ADS component library. In order to keep the cost of the circuit in low prices and the performance high, we design a two-stage LNA.展开更多
The esophagus is the most commonly affected part of the gastrointestinal system in patients with systemic sclerosis(SSc).Esophageal involvement may lead to a significant reduction in patient quality of life.The exact ...The esophagus is the most commonly affected part of the gastrointestinal system in patients with systemic sclerosis(SSc).Esophageal involvement may lead to a significant reduction in patient quality of life.The exact pathophysiology is complex and not yet fully elucidated.Ultimately,esophageal smooth muscle becomes atrophied and replaced by fibrous tissue leading to severe motility disturbance of the distal esophagus.Symptoms are mainly attributed to gastroesophageal reflux disease and to esophageal dysmotility.Compelling evidence has correlated esophageal involvement to the severity of pulmonary disease.No formed guidelines exist about the diagnostic modalities used to assess esophageal disease in patients with SSc,though upper gastrointestinal endoscopy is the first and most important modality used as it can reveal alterations commonly observed in patients with SSc.Further exploration can be made by high resolution manometry and pH-impedance study.Proton pump inhibitors remain the mainstay of treatment,while prokinetic agents are commonly used as add-on therapy in patients with symptoms attributed to gastroesophageal reflux disease not responding to standard therapy as well as to motility disturbances.Gastroesophageal reflux disease symptoms in patients with SSc are frequently difficult to manage,and new therapeutic modalities are emerging.The role of surgical treatment is restricted and should only be preserved for resistant cases.展开更多
文摘In this paper, the design of a 9.1 GHz Low Noise Amplifier (LNA) of a RADAR receiver that is used in the Navy is presented. For the design of the LNA, we used GaAs Field-Effect Transistors (FETs) from Agilent ADS component library. In order to keep the cost of the circuit in low prices and the performance high, we design a two-stage LNA.
文摘The esophagus is the most commonly affected part of the gastrointestinal system in patients with systemic sclerosis(SSc).Esophageal involvement may lead to a significant reduction in patient quality of life.The exact pathophysiology is complex and not yet fully elucidated.Ultimately,esophageal smooth muscle becomes atrophied and replaced by fibrous tissue leading to severe motility disturbance of the distal esophagus.Symptoms are mainly attributed to gastroesophageal reflux disease and to esophageal dysmotility.Compelling evidence has correlated esophageal involvement to the severity of pulmonary disease.No formed guidelines exist about the diagnostic modalities used to assess esophageal disease in patients with SSc,though upper gastrointestinal endoscopy is the first and most important modality used as it can reveal alterations commonly observed in patients with SSc.Further exploration can be made by high resolution manometry and pH-impedance study.Proton pump inhibitors remain the mainstay of treatment,while prokinetic agents are commonly used as add-on therapy in patients with symptoms attributed to gastroesophageal reflux disease not responding to standard therapy as well as to motility disturbances.Gastroesophageal reflux disease symptoms in patients with SSc are frequently difficult to manage,and new therapeutic modalities are emerging.The role of surgical treatment is restricted and should only be preserved for resistant cases.
