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基于数值模拟的选区激光熔化成形残余应力演化研究

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精密成形工程 2024年第1期16卷 174-180页

作者：赵仕宇陈向文詹艳然福州职业技术学院机电工程系福州350121 福州大学机械工程及自动化学院福州350108

目的以选区激光熔化成形(SLM)试件的残余应力为研究对象,研究残余应力对成形质量的影响,为SLM成形的产业化应用提供理论依据。方法以316L不锈钢粉末为原材料,利用AltairInspire软件的Print3D模块分析SLM成形中支撑、成形角对残余应力的... 详细信息

目的以选区激光熔化成形(SLM)试件的残余应力为研究对象,研究残余应力对成形质量的影响,为SLM成形的产业化应用提供理论依据。方法以316L不锈钢粉末为原材料,利用AltairInspire软件的Print3D模块分析SLM成形中支撑、成形角对残余应力的影响及残余应力的演化规律,并进行实验验证。结果SLM成形最大残余应力出现在零件与基板结合面,添加支撑可减小残余应力。零件不同位置残余应力的演化规律不同。顶部残余应力呈先增大后减小的趋势,底部两侧残余应力呈缓慢上升的趋势;底部中间残余应力的演化规律较为复杂:起先残余应力随温度的降低而增大,当温度降到最低点时达最大值;随后在热累积作用下,残余应力先减小后增大,当达到去应力退火温度时,残余应力又减小并在一定范围内波动。残余应力随着成形角的增大呈先增大后减小再增大的趋势,当成形角为60°时,残余应力较小。结论在SLM成形时,在零件底部添加支撑可将最大残余应力位置转移到支撑上,从而减小成形件内部的残余应力,提高成形质量。成形零件不同位置残余应力的演化规律不同,成形角对残余应力的影响也不同,成形时应根据零件工况制定合适的打印策略。

关键词：数值模拟选区激光熔化残余应力 316L不锈钢成形角

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group Connectivity and group Colorings of graphs -- A Survey

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Acta Mathematica Sinica,English Series 2011年第3期27卷 405-434页

作者： Hong-Jian LAI xiangwen LI Yehong SHAO Mingquan zhan College of Mathematics and System Sciences Xinjiang University Urumqi 830046 P. R. China Department of Mathematics West Virginia University Morgantown WV26506 USA Department of Mathematics Huazhong Normal University Wuhan 430070 P. R. China Department of Mathematics Ohio University Southern Campus Ironton OH 45638 USA Department of Mathematics Millersville University of Pennsylvania Millersville PA 17551 USA

In 1950s, Tutte introduced the theory of nowhere-zero flows as a tool to investigate the coloring problem of maps, together with his most fascinating conjectures on nowhere-zero flows. These have been extended by Jaeger et al. in 1992 to group connectivity, the nonhomogeneous form of nowhere-zero flows. Let g be a 2-edge-connected undirected graph, A be an （additive） abelian group and A＊ = A - {0}. The graph g is A-connected if g has an orientation D（g） such that for every map b ： V（g） → A satisfying ∑v∈V（g）b（v）： 0, there is a function f ： E（g） → A＊ such that for each vertex v ∈ V（g）, the total amount of f-values on the edges directed out from v minus the total amount of f-values on the edges directed into v is equal to b（v）. The group coloring of a graph arises from the dual concept of group connectivity. There have been lots of investigations on these subjects. This survey provides a summary of researches on group connectivity and group colorings of graphs. It contains the following sections. 1. Nowhere-zero Flows and group Connectivity of graphs 2. Complete Families and A-reductions 3. Reductions with Edge-deletions, Vertex-deletions and Vertex-splitting 4. group Colorings as a Dual Concept of group Connectivity 5. Brooks Theorem, Its Variations and Dual Forms 6. Planar graphs 7. group Connectivity of graphs 7.1 Highly Connected graphs and Collapsible graphs 7.2 Degrees Conditions 7.3 Complementary graphs 7.4 Products of graphs 7.5 graphs with Diameter at Most 2 7.6 Line graphs and Claw-Free graphs 7.7 Triangular graphs 7.8 Claw-decompositions and All Tutte-orientations

关键词： group connectivity group connectivity number group coloring group chromatic number

Small cell carcinoma of the gastric remnant：a case report

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Oncology and Translational Medicine 2018年第2期4卷 76-79页

作者： Xiaozhen zhan Baiying Liu Wenbin Li Taotao zhang xiangwen zhang guo Zu Department of gastroenterology Dalian Municipal Central Hospital Dalian 116033 China Dalian Medical University Dalian 116044 China

Objective Small cell carcinoma(SCC) is mostly found in the lungs. It is extremely rare in the gastric remnant. Here, we report a case and review the literature in order to improve the diagnosis and treatment of SCC of the gastric *** We report a case of SCC of the gastric remnant in a 71-year-old male Chinese patient who presented with epigastric pain, acid regurgitation, and belching and who underwent Billroth II gastrectomy more than 38 years *** Physical examination showed no obvious abnormalities. Laboratory data were within normal limits, except for anemia. Pathology of the mass showed a protruded tumor measuring 5.0 × 5.0 × 2.5 cm at the anastomotic edge of the gastric remnant that infiltrated through the full wall of the stomach; this was confirmed by immunohistochemical staining for cytokeratin [CK(-)], leukocyte common antigen(LCA)(+), synaptophysin(+), CD56(+), and Ki-67(+ > 50%).Conclusion SCC of the gastric remnant is extremely rare, although the pathology, symptoms, diagnosis, treatment, and prognosis of SCC are similar to those of gastric SCC. Although the standard treatment of SCC of the gastric remnant remains unclear, effective surgical resection and subsequent multiagent chemotherapy should be performed for long-term survival. Our case shows the efficacy of tegafurgimeracil-oteracil-potassium capsule chemotherapy. Examination of a large series is required to determine the optimal treatment strategy for SCC of the gastric remnant.

关键词： small cell carcinoma (SCC) gastric stump cancer gastric remnant gastric carcinoma

gastric adenocarcinoma with hepatoid adenocarcinoma:A case report and literature review

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Oncology and Translational Medicine 2018年第1期4卷 35-37页

作者： Yao Han Lin Zhen Baiying Liu Xiaozhen zhan Wenbin Li Taotao zhang xiangwen zhang guo Zu Department of gastroenterology Dalian Municipal Central HospitalDalian 116033China Dalian Medical University Dalian 116044China

Objective Hepatoid adenocarcinoma of the stomach is exceedingly rare. Only a few cases have been reported worldwide. In this report, we describe our pathological findings along with a review of the literature to improve our understanding of the disease and prevent misdiagnosis, as well as to provide evidence for its treatment and *** A 68-year-old male patient was admitted to our hospital(Dalian Municipal Central Hospital, Dalian, China) complaining of upper abdominal pain. Physical examination and regular laboratory blood tests showed no obvious abnormalities. A contrast-enhanced computed tomography scan displayed a 3.0 cm × 3.0 cm mass in the gastric antrum, but no metastasis was found in the adjacent *** A radical gastrectomy was performed and postoperative histopathology showed a moderately differentiated adenocarcinoma with partial hepatoid *** Hepatoid adenocarcinoma of the stomach is a rare malignant neoplasm. The diagnostic criteria for hepatoid adenocarcinoma of the stomach depends mainly on the clinical, radiographic, and histopathological findings. Pathomorphology and immunohistochemical staining can be utilized to confirm the diagnosis.

关键词： gastric cancer adenocarcinoma hepatoid immunohistochemistry

基于AISAS模型的皮影营销研究——以京西非遗皮影园为例

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玩具世界 2023年第6期 170-172页

作者：赵展田湘文魏一鸣鲁迅美术学院人文学院(大连)

皮影是传承千年的艺术瑰宝，如何有效地对其进行营销传播是值得探究的问题。文章探讨了皮影戏在数字化时代下的营销传播问题，以AISAS模型为基础，以京西非遗皮影园为案例，尝试梳理出解决皮影戏当下营销发展困境的方法，为其他皮影品... 详细信息

皮影是传承千年的艺术瑰宝，如何有效地对其进行营销传播是值得探究的问题。文章探讨了皮影戏在数字化时代下的营销传播问题，以AISAS模型为基础，以京西非遗皮影园为案例，尝试梳理出解决皮影戏当下营销发展困境的方法，为其他皮影品牌或非遗传承提供参考。

关键词： AISAS模型皮影营销京西皮影非遗园

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四川省主要烟区土壤杂草种子库研究

烟草科技 2015年第6期48卷 19-22页

作者：战徊旭时焦孟坤雒振宁殷英余祥文王勇曾庆宾罗定棋向金友顾会战杨兴有中国农业科学院烟草研究所烟草行业烟草病虫害监测与综合治理重点实验室山东省青岛市266101 四川省烟草技术中心四川省凉山州西昌市615000 四川省烟草公司凉山州公司四川省凉山州西昌市615000 四川省烟草公司攀枝花市公司四川省攀枝花市617026 四川省烟草公司泸州市公司四川省泸州市646000 四川省烟草公司宜宾市公司四川省宜宾市644002 四川省烟草公司广元市公司四川省广元市628017 四川省烟草公司达州市公司四川省达州市635000

为有效控制植烟区烟田杂草，于2011—2014年利用诱萌法对四川省主要植烟区土壤杂草种子库的组成及数量进行了研究。结果表明，土壤杂草种子库样品中共有15科24种杂草种子，主要分布于0～15cm土层中。禾本科杂草为优势种群，其次为菊科... 详细信息

为有效控制植烟区烟田杂草，于2011—2014年利用诱萌法对四川省主要植烟区土壤杂草种子库的组成及数量进行了研究。结果表明，土壤杂草种子库样品中共有15科24种杂草种子，主要分布于0～15cm土层中。禾本科杂草为优势种群，其次为菊科杂草，再次为藜科杂草。双子叶杂草种类多于单子叶杂草，但其杂草种子数量明显少于单子叶杂草。广元烟区杂草种子库数量最大，达到19119粒／m^2；攀枝花烟区杂草种子库数量最小，为6177粒／m^2。

关键词：四川烟区杂草种子库诱萌法单子叶杂草双子叶杂草

肝细胞癌原位与皮下PDX模型的方法学比较分析研究

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中国实验动物学报 2021年第4期29卷 512-518页

作者：朱瑞敏李宝亮路亚岚詹相文刘益豪韩云林秦川高苒中国医学科科学院医学实验动物研究所北京协和医学院比较医学中心国家人类疾病动物模型资源库国家卫生健康委员会人类疾病比较医学重点实验室北京市人类重大疾病实验动物模型工程技术研究中心北京100021 首都医科大学附属北京地坛医院北京100015

目的构建肝细胞癌(hepatocellular carcinoma,HCC)原位与皮下人源肿瘤异种移植(patient-derived xenografts,PDX)模型,并比较分析两者生长和病理学特点。方法收集肝癌患者的新鲜肿瘤组织,接种肝和皮下组织,比较分析两者生长特性、病理... 详细信息

目的构建肝细胞癌(hepatocellular carcinoma,HCC)原位与皮下人源肿瘤异种移植(patient-derived xenografts,PDX)模型,并比较分析两者生长和病理学特点。方法收集肝癌患者的新鲜肿瘤组织,接种肝和皮下组织,比较分析两者生长特性、病理特征、成瘤率和成瘤时间。结果本次研究成功构建肝癌原位和皮下PDX模型,两者与患者原发肿瘤病理特征一致,其中原位和皮下综合成瘤率分别为50%(3/6)和20%(3/15),平均成瘤时间为30 d和68 d。结论肝癌原位PDX模型成瘤率高,对于难生长肿瘤提供了一个新的建模方法,皮下成瘤操作和观察较为简单,在具体科研实践中应根据情况使用合适方法。它们为深入探索HCC的发病机制,及药物筛选提供有效的动物模型。

关键词：肝细胞癌人源肿瘤异种移植模型原位移植皮下移植

小麦粉中脱氧雪腐镰刀菌烯醇(DON)毒素的气相色谱法检测及毒素污染去除分析

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农药科学与管理 2018年第4期39卷 33-39页

作者：张正炜成玮沈慧梅田如海武向文郭玉人占绣萍上海市农业技术推广服务中心上海201103 上海市农药检定所上海201103

建立了一种用气相色谱仪分析小麦粉中脱氧雪腐镰刀菌烯醇(DON)毒素残留的分析方法。样品以乙腈/水混合溶液提取,样品提取液经充分晾干后,将毒素生成三甲基硅烷(TMS)衍生物,最后用电子捕获检测器(ECD)测定。DON在0.01～1.0mg/L范围内线... 详细信息

建立了一种用气相色谱仪分析小麦粉中脱氧雪腐镰刀菌烯醇(DON)毒素残留的分析方法。样品以乙腈/水混合溶液提取,样品提取液经充分晾干后,将毒素生成三甲基硅烷(TMS)衍生物,最后用电子捕获检测器(ECD)测定。DON在0.01～1.0mg/L范围内线性关系良好,线性相关系数为0.998 5。在0.04、0.2、1.0 mg/kg 3个浓度水平进行了添加实验,在小麦粉中其平均回收率为93.8%～108.5%,相对标准偏差为4.3%～8.6%。方法的最低检测浓度为0.01 mg/kg。该方法操作简单、快速、准确,可普遍用于基层检测机构中小麦粉DON的日常检测。结果表明:面粉中DON含量明显低于小麦粒中,对田间看似健康的小麦粒是否感染DON毒素,是无法简单通过肉眼观察到的,所以对小麦粒进行DON含量监测和去毒处理是非常有必要的。

关键词： DON 小麦柱前衍生气相色谱