ABSTRACT
Objective: To explore the effect of cabinet type water curtain exhaust hood applied to small sandblasting machine to prevent and control silicon dust, and put forward a new idea of dust ventilation protection facilities to effectively protect the occupational health of workers. Methods: From August to October 2018, the cabinet type water curtain exhaust hood of sandblasting room in a research institute was selected as the research object, and the methods of occupational health survey, on-site detection and physical simulation of air distribution were used to conduct on-site detection and smoke emission test on the local exhaust facilities, silica dust concentration, control wind speed and air distribution before and after the transformation line analysis and evaluation. Results: The air distribution simulation experiment showed that the air distribution of the cabinet type water curtain exhaust hood was reasonable and could effectively control the whole range of silica dust emission during the cleaning process. After modification, the capture velocity was increased from 0.01 m/s to 0.53 m/s, and the capture velocity was increased by 98.1%. The time weighted average allowable concentration (C(TWA)) of silicon dust (total dust) during sand blasting, cabin opening and cleaning was reduced from 7.00 mg/m(3) to 0.50 mg/m(3). The C(TWA) of silica dust (exhalation dust) was decreased from 3.36 mg/m(3) to 0.27 mg/m(3), and the C(TWA) dust reduction rates of total dust and respirable dust were 92.9% and 92.0%, respectively. Conclusion: The combination of cabinet type exhaust hood and water curtain dedusting optimizes the combination mode of dust prevention and control. It has the advantages of high efficiency of dedusting and purification, energy saving and environmental protection, and can be popularized and used in enterprises of the same nature.
Subject(s)
Air Pollutants, Occupational , Occupational Exposure , Air Pollutants, Occupational/analysis , Dust/analysis , Equipment Design , Humans , Inhalation Exposure , Occupational Exposure/analysis , Occupational Exposure/prevention & control , Silicon , Silicon Dioxide/analysis , WaterABSTRACT
From 1985 to 1990, we treated 60 patients with adrenopathy, in which 4 (6.6%) had atypical adrenopathy. In the 4 patients, 1 showed Cushing's syndrome caused by an unilateral cortical adenoma and cortical hyperplasia on the contralateral side, 1 aldosteronism and pheochromocytomatic syndrome due to right cortical and medullary hyperplasia and a left cortical adenoma, 1 huge left nonfunctional cortical adenoma, and 1 pheochromocytomatic syndrome resulting from a cortical adenoma. The pathogenesis of the disease was discussed.
Subject(s)
Adenoma/pathology , Adrenal Cortex Neoplasms/pathology , Adrenal Glands/pathology , Adult , Diagnosis, Differential , Female , Humans , Hyperplasia , Male , Middle AgedABSTRACT
From 1962 to 1980, 24 patients with primary urethral carcinoma and 1 vulval cancer involving the urethra were treated in our hospital. In this series, the mean age was 52 years. 23 lesions in the distal (anterior) urethra were all diagnosed preoperatively. Pathological classification were as follows: squamous cell carcinoma 16, adenocarcinoma 3, transitional cell carcinoma and undifferentiated carcinoma 4. The chief method of treatment were resection of the tumor and reconstruction of a new urethra, using bladder flap in two forms: abdominal urethra and reconstructed urethra in the original position. Preoperative or postoperative irradiation was given in one third of the patients. 17 patients have shown satisfactory results in the follow-up. The 7 and 10 year survival rates are 36% and 18% among 11 patients who are living and well.
