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从振动信号的角度出发,探讨了用时域特征作为诊断参数,提取经过多分辨分析各个不同频带的时域参数作为特征向量,进行隔膜泵状态监测和故障诊断的可行性。为隔膜泵的状态监测和故障诊断方法的研究开辟了一个新思路。 相似文献
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本文研究了Windows操作系统下I/O端口应用问题,用VC^ 6.0嵌入汇编语言技术,为“远传水表系统”项目开发了Modem通讯软件,并给出了部分实现函数。实践表明,软件运行良好。 相似文献
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JR Wagner MJ Merino HI Pass WM Linehan MM Walther 《Canadian Metallurgical Quarterly》1997,158(5):1688-1690
PURPOSE: Spontaneous regression of pulmonary metastases from renal cell carcinoma is a rare but well documented event. We present 2 recent cases that were radiographically consistent with pulmonary metastases from renal cell carcinoma but were pathologically shown to be pulmonary infarcts with no evidence of metastatic cells. Stable pulmonary infarcts can be misconstrued as metastatic disease in patients with renal cell carcinoma while resolving pulmonary infarcts may represent a subpopulation of patients with apparent spontaneous regression. Clinical implications of these findings are discussed. MATERIALS AND METHODS: Clinical and pathological data from 2 patients with large primary renal tumors, venous thrombi and lung masses were reviewed. Data from these cases, as well as pertinent urological and pathological literature, are presented. RESULTS: Although preoperative assessment was consistent with stage IV renal cell carcinoma, pathological examination of the lung masses in these patients showed no evidence of tumor cells. CONCLUSIONS: Pulmonary infarcts may mimic resolving or stable pulmonary metastasis in patients with renal cell carcinoma. Accurate clinical staging is crucial for the prognosis and treatment of renal cell carcinoma. Mistaking pulmonary infarcts for metastatic lesions can lead to inaccurate prognoses and inappropriate treatment. 相似文献
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根据离子膜法碱液蒸发器的长期使用情况,分析了在其设计、制造、安装中存在的一些问题,并给出了改进措施。 相似文献
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BACKGROUND: The place of acid pump inhibitors at the top of the efficacy table in the league of reflux therapies, and their eager patient acceptance, has aroused debate on their role. OBJECTIVE: To understand the role of gastric acid and its inhibition in the pathogenesis and treatment of gastroesophageal reflux disease. DISCUSSION: Gastroesophageal reflux disease results from excessive exposure of the oesophagus to acidic contents. Acid pump inhibitors provide the most effective medical control of gastric acid throughout day and night, returning oesophageal pH to normal levels. They provide fast symptom relief and rapidly restore quality of life in all reflux patients more effectively than H2 receptor antagonists or prokinetic drugs. APIs heal oesophagitis of all grades of severity and provide safe, effective maintenance of healing with prevention of complications in longer term use. 相似文献
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This clinical research plan was designed to evaluate the predictable and current developments, growth, and stability of the economic status of part-time or full-time African-American practicing surgeons. In many communities throughout the United States, the economic successes of certified or experienced black surgical specialists are inhibited or modified by mistrust, jealousy, professional disengagements, prejudices, and self-hatred by black and white physicians and lay African Americans. Nevertheless, there are subtle and overt evidences of increasing satisfactory and above average associative interprofessional relationships between African-American physicians and surgical specialists. One hundred African-American surgical specialists from thirty-four communities in the United States were interviewed at periodic intervals over a period of three decades. Recommendations for improvements and changes are presented. 相似文献
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HI Pass DJ Mew KC Kranda BK Temeck JS Donington SA Rosenberg 《Canadian Metallurgical Quarterly》1996,61(6):1609-1617
BACKGROUND: A phase I trial was initiated to define the feasibility and safety of single-lung isolation perfusion with tumor necrosis factor-alpha, interferon-gamma, and moderate hyperthermia for patients with unresectable pulmonary metastases. METHODS: Twenty patients with lung metastases (Ewing's, 2; sarcoma, 8; melanoma, 6; other, 4) were considered for single-lung isolation perfusion with 0.3 to 6.0 mg of tumor necrosis factor-alpha and 0.2 mg interferon-gamma delivered through an oxygenated pump circuit. Sixteen perfusions were performed in 15 patients (bilateral in 1). Metastases were completely resected (no single-lung isolation perfusion) in 3 patients, 1 patient had extrapulmonary disease, and one single-lung isolation perfusion was aborted for mechanical reasons. RESULTS: There were no significant changes in systemic arterial blood pressure or cardiac output during perfusion. Systolic pulmonary artery pressure increased with isolation, but returned to pre-single-lung isolation perfusion levels after clamp release. The maximum systemic tumor necrosis factor-alpha level was 8 ng/mL, whereas pump-circuit levels ranged from 200 to 10,976 ng/mL. There were no deaths, and the mean hospitalization period was 9 days (range, 5 to 34 days). A short-term (6 to 9 month) unilateral decrease in perfused nodules was noted in 3 patients (melanoma in 1, adenoid cystic carcinoma in 1, renal cell carcinoma in 1). CONCLUSIONS: Future studies using a combination of biologic modifiers, chemotherapy, and hyperthermia should be pursued to define active cytotoxic agents that will preserve underlying pulmonary function. 相似文献