对比了国内外高速列车车体设计标准中气动载荷的设计要求,分析了明线会车侧墙压力波,采用时间积分法,将车体瞬态压强转化为侧墙气动载荷,参照标准BS EN 12663-1—2010确定了包括气动载荷的车体疲劳载荷工况,以某型动车组头车为研究对象...对比了国内外高速列车车体设计标准中气动载荷的设计要求,分析了明线会车侧墙压力波,采用时间积分法,将车体瞬态压强转化为侧墙气动载荷,参照标准BS EN 12663-1—2010确定了包括气动载荷的车体疲劳载荷工况,以某型动车组头车为研究对象,建立了车体有限元模型,基于车体Goodman疲劳强度曲线编写了车体疲劳强度后处理程序,研究了车体疲劳特性。计算结果表明:在不考虑气动载荷时计算的较大应力幅值出现在底架上,而在考虑气动载荷时计算的车体较大应力幅值出现在侧墙门角和窗角上,最大应力幅值为33.63 MPa,疲劳强度安全系数为2.26,相对于侧墙,底架的应力幅值较小,小于10.00 MPa,疲劳强度安全系数大于10.00。在垂向载荷作用下,侧墙最大当量应力为68.17 MPa,叠加气动载荷后侧墙最大当量应力为85.31 MPa,应力增大了25.14%,因此,气动载荷对侧墙影响较大,容易导致侧墙发生疲劳失效。可见,在高速列车车体设计时,应将气动载荷与其他疲劳载荷相组合对车体疲劳强度进行评定。展开更多
原发性子宫内膜鳞状细胞癌(primary squamous cell carcinoma of the endometrium,PSCCE)是子宫内膜恶性肿瘤的一种罕见类型,于1892年首次报道,检索截至2022年10月国内外文献均为个案报道,目前仅有100余例,最大病例数为1996年Goodman等...原发性子宫内膜鳞状细胞癌(primary squamous cell carcinoma of the endometrium,PSCCE)是子宫内膜恶性肿瘤的一种罕见类型,于1892年首次报道,检索截至2022年10月国内外文献均为个案报道,目前仅有100余例,最大病例数为1996年Goodman等[1]及2006年Horn等[2]报道的8例。根据世界卫生组织女性生殖系统肿瘤分类(第5版)[3],其仅占子宫内膜癌的不足5%。目前,PSCCE的病因、临床病理表现、治疗及预后尚不明确,本文对其进行综述,以增强对PSCCE的认识。展开更多
A finite element program with two different soil models is adopted to study the negative skin friction of an unloaded single pile embedded in the settlement trough of a tunnel. The results show that it is necessary to...A finite element program with two different soil models is adopted to study the negative skin friction of an unloaded single pile embedded in the settlement trough of a tunnel. The results show that it is necessary to consider the nonlinear property of soil and to set interface elements between piles and soil in analysis of the negative skin friction of piles. Among a pile group, the pile located above the tunnel centerline bears larger downdrag than the ones far away from tunnel centerline.展开更多
In the application of distortion energy theory to multiaxial fatigue prediction problems,it isquite frequent to meet with a confusion in the evaluation of the extremum values of equivalentstresses.In this paper,a desc...In the application of distortion energy theory to multiaxial fatigue prediction problems,it isquite frequent to meet with a confusion in the evaluation of the extremum values of equivalentstresses.In this paper,a description about this error is presented and discussed thereafter.Neces-sary correction has been made towards this problem.展开更多
Young Goodman Brown is one of the most popular short stories written by Nathaniel Hawthorne. Since its publication,quite a lot of analyses have been made of this short but excellent story. In reading the book, one can...Young Goodman Brown is one of the most popular short stories written by Nathaniel Hawthorne. Since its publication,quite a lot of analyses have been made of this short but excellent story. In reading the book, one can never miss those symbolic meanings. However, with an analysis of the journey which Brown takes, the artistic skills and symbolic images carefully employed by Hawthorne, this thesis aims at describing the loss of faith, and also attempting to seek the reasons for Brown's tragedy and find possible solution to this dilemma of faith crisis.展开更多
Since the appearance of the Gothic novel in the late 18 th century, the usage of Gothic elements has been applied to the creation of literary works, and it has influenced many excellent writers. Nathaniel Hawthorne is...Since the appearance of the Gothic novel in the late 18 th century, the usage of Gothic elements has been applied to the creation of literary works, and it has influenced many excellent writers. Nathaniel Hawthorne is one of the outstanding representatives. His short story Young Goodman Brown was regarded as"one of the ten best stories written by an American"by Stephen King.Young Goodman Brown will be interpreted from the perspective of Gothic style to appreciate its unique Gothic beauty.Through the analysis of the Gothic elements reflected in Young Goodman Brown, more readers will pay attention to the charm of Hawthorne's short story, and show that Gothic novels with its terrifying atmosphere give readers a new visual experience, digging the hidden evil as well as calling for goodness of humanity.展开更多
文摘原发性子宫内膜鳞状细胞癌(primary squamous cell carcinoma of the endometrium,PSCCE)是子宫内膜恶性肿瘤的一种罕见类型,于1892年首次报道,检索截至2022年10月国内外文献均为个案报道,目前仅有100余例,最大病例数为1996年Goodman等[1]及2006年Horn等[2]报道的8例。根据世界卫生组织女性生殖系统肿瘤分类(第5版)[3],其仅占子宫内膜癌的不足5%。目前,PSCCE的病因、临床病理表现、治疗及预后尚不明确,本文对其进行综述,以增强对PSCCE的认识。
文摘A finite element program with two different soil models is adopted to study the negative skin friction of an unloaded single pile embedded in the settlement trough of a tunnel. The results show that it is necessary to consider the nonlinear property of soil and to set interface elements between piles and soil in analysis of the negative skin friction of piles. Among a pile group, the pile located above the tunnel centerline bears larger downdrag than the ones far away from tunnel centerline.
文摘In the application of distortion energy theory to multiaxial fatigue prediction problems,it isquite frequent to meet with a confusion in the evaluation of the extremum values of equivalentstresses.In this paper,a description about this error is presented and discussed thereafter.Neces-sary correction has been made towards this problem.
文摘Young Goodman Brown is one of the most popular short stories written by Nathaniel Hawthorne. Since its publication,quite a lot of analyses have been made of this short but excellent story. In reading the book, one can never miss those symbolic meanings. However, with an analysis of the journey which Brown takes, the artistic skills and symbolic images carefully employed by Hawthorne, this thesis aims at describing the loss of faith, and also attempting to seek the reasons for Brown's tragedy and find possible solution to this dilemma of faith crisis.
文摘Since the appearance of the Gothic novel in the late 18 th century, the usage of Gothic elements has been applied to the creation of literary works, and it has influenced many excellent writers. Nathaniel Hawthorne is one of the outstanding representatives. His short story Young Goodman Brown was regarded as"one of the ten best stories written by an American"by Stephen King.Young Goodman Brown will be interpreted from the perspective of Gothic style to appreciate its unique Gothic beauty.Through the analysis of the Gothic elements reflected in Young Goodman Brown, more readers will pay attention to the charm of Hawthorne's short story, and show that Gothic novels with its terrifying atmosphere give readers a new visual experience, digging the hidden evil as well as calling for goodness of humanity.
