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基于损伤力学的含夹杂粉末高温合金FGH96低周裂纹萌生寿命预测 被引量:3
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作者 徐元铭 张书明 +2 位作者 贺天鹏 刘新灵 常夏源 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2022年第3期895-907,共13页
研究FGH96粉末高温合金中夹杂物对低周疲劳寿命的影响,提出基于损伤力学理论的低周裂纹萌生寿命预测模型,在建立损伤演化方程后提出损伤表征参数。对含夹杂物和不含夹杂物的粉末高温合金试样在530℃和600℃下进行疲劳试验,并对具有椭圆... 研究FGH96粉末高温合金中夹杂物对低周疲劳寿命的影响,提出基于损伤力学理论的低周裂纹萌生寿命预测模型,在建立损伤演化方程后提出损伤表征参数。对含夹杂物和不含夹杂物的粉末高温合金试样在530℃和600℃下进行疲劳试验,并对具有椭圆形、半椭圆形、多边形和条形表面/亚表面夹杂物的试样进行模型验证,然后通过有限元模拟进行应力分析,并计算预测寿命。结果表明,预测寿命和实验寿命之间具有令人满意的一致性。 展开更多
关键词 粉末高温合金FGH96 低周疲劳 夹杂 裂纹萌生寿命预测 损伤力学
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Diagnosis and treatment of an elderly patient with 2019-nCoV pneumonia and acute exacerbation of chronic obstructive pulmonary disease in Gansu Province:A case report 被引量:6
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作者 tian-peng he Dong-Liang Wang +4 位作者 Jing Zhao Xiao-Ying Jiang Jin He Jian-Ke Feng Yuan Yuan 《World Journal of Clinical Cases》 SCIE 2020年第17期3903-3910,共8页
BACKGROUND In December 2019,the first patient with 2019-novel coronavirus(2019-nCoV)was reported in Wuhan,China,and the disease spread rapidly across the country and surrounding countries within 2 mo.As of February 29... BACKGROUND In December 2019,the first patient with 2019-novel coronavirus(2019-nCoV)was reported in Wuhan,China,and the disease spread rapidly across the country and surrounding countries within 2 mo.As of February 29,2020,a total of 91 confirmed cases had been reported in Gansu Province.This case report of the diagnosis and treatment of an elderly patient with 2019-nCoV pneumonia complicated by acute exacerbation of chronic obstructive pulmonary disease in Gansu Province aims to provide a better reference for the treatment of patients in the future.CASE SUMMARY The patient,a 94-year-old female,lived in Maiji District of Tianshui,Gansu Province,China.On January 30,2020,she was admitted to the Fourth People’s Hospital of Tianshui after 9 d of close contact with a patient with 2019-nCoV pneumonia.She was subsequently admitted to Gansu Provincial Hospital of Traditional Chinese Medicine for isolation and transferred to Tianshui Gansu Provincial Hospital of Infectious Diseases on February 3,2020 for treatment.Upon initial examination,her body temperature was 36.7°C,pulse was 80,breathing was 20,and blood pressure was 130/80 mmHg.She was conscious with normal development and normal nutrition.The pharynx was not red,and bilateral tonsils were not red and swollen.The lungs sounded slightly coarse with no dry or wet rales.The first symptoms were cough and fatigue on 2 February.The patient was hospitalized for 12 d.After active treatment,she was discharged on February 14 with a good prognosis.CONCLUSION A history of exposure to the affected area or patient is a major cause of 2019-nCoV infection,and population clustering is a high risk factor for transmission.Patients may not necessarily have respiratory system symptoms as the only clinical manifestation but may also have concomitant or first onset digestive symptoms.Attention should be paid to the prevention and treatment of multiple organ dysfunction syndrome.Nucleic acid testing is extremely important and needs to be repeated several times.Laboratory and auxiliary examination indicators during the first week of admission are extremely important.It is feasible to carry out dynamic and continuous index monitoring,which can predict and guide the prevention and treatment of multiple organ dysfunction and the prognosis of the disease. 展开更多
关键词 2019-nCoV pneumonia Acute exacerbation of chronic obstructive pulmonary disease Epidemiological investigation Clinical manifestations Integrated Chinese and Western medicine treatment
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