企业IT投资决策行为影响因素及模型研究     

毕新华  张鹤达 《情报杂志》2007,26(3):5-6,9

以决策者为中心,通过决策者对企业内、外部环境的感知,分析了影响企业IT投资决策行为的因素构成、特征及对决策效果影响,最后构建企业IT投资决策行为模型。  相似文献   

蕴涵论题成立吗?——对传统蕴涵论证的分析与重构     

毕文胜 《科学技术哲学研究》2021,38(6):60-66

从知识正统三元定义出发,知识和信念之间的蕴涵关系似乎为当代绝大多数的知识论学家所接受.在二十世纪六七十年代,蕴涵论题与反蕴涵论者之间进行了影响深远的争论.笔者认为,反蕴涵的两种路径都不构成对蕴涵论题的反驳,问题的关键在于误解了语用学在当代知识论中的运用.语言哲学的反蕴涵路径混淆了蕴涵关系的语义学与语用学差异;"不自信考生案例"路径所揭示的是辩护视角的内在主义与外在主义的分歧,本质上是知识论归因者语境主义的运用.  相似文献   

白藜芦醇/富勒烯纳米组装体的制备——在胆管支架抗炎涂层中的应用评估     

高建  刘永佳  戚晓亮  徐汪节  乔中东 《实验室研究与探索》2021,(2):58-62

采用白藜芦醇(Res)和富勒烯(C60)结合制备Res/C60纳米组装体并验证其安全性和抗炎性。通过扫描电子显微镜(SEM)、拉曼光谱和X射线衍射研究了纳米组装体形貌、粒径大小及波谱峰值特征。其次,通过紫外分光光度法研究了Res的药物缓释行为。最后,通过MTT法在人脐静脉内皮细胞(HUVECs)层面验证了Res/C60纳米组装体的安全性以及体外的抗炎性。研究发现,Res/C60纳米组装体呈短棒状,横截面平均直径为(379.74±33.47)nm。拉曼光谱和X射线衍射特征峰显示Res/C60纳米组装体被成功制备。Res/C60纳米组装体的聚氨酯(PU)涂层中Res药物在30 d内累积释放量可达60%左右。胆管支架涂层对HUVECs细胞毒性较低,且通过释放Res可显著抑制炎症因子的释放。  相似文献   

论高校学生终身体育意识的培养     

毕秀淑  杨倩 《济南职业学院学报》2006,(5):88-89

通过对大学生目前对终身体育的认识与体育态度的问卷调查发现:大学生亟待提高自身的体育文化素养,需要掌握现代科学健身的方法、技术、卫生保健和医务监督方面的知识。文章围绕“健康第一”、“终身体育教育”建议教师在体育教学中应重视大学生终身体育意识的培养。  相似文献   

张之洞与维新派     

闭雄壮 《桂林师范高等专科学校学报》2002,16(4):19-23

甲午战败后,由于张之洞与维新派在救亡和变法等方面有许多共同之处,双方进行合作。张之洞在合作过程中坚持为我所用的方针和“中体西用”的指导思想。由于在思想等方面的矛盾,张之洞与维新派的合作关系最终破裂。  相似文献   

几种毛皮动物     

毕海华  吴国舟 《生物学教学》2008,33(1):60-61

动物的毛皮用处很多,可以用来做皮鞋、床垫、皮夹克、皮带、皮包、毛领等,下面介绍几种常见的毛皮动物形态、生活习性及与人类的关系,使大家加深对这些动物的了解,自觉地加入到保护动物的行列中来。  相似文献   

上海市幼儿园沙池设置及玩沙活动调查     

毕晓芬  张志宏 《幼儿教育》2008,(2)

上海市多数幼儿园已经配备了玩沙设施,能不同程度地组织幼儿开展玩沙活动,大多数教师也肯定玩沙活动对幼儿发展的价值,但在具体组织玩沙活动时仍然存在一些问题.幼儿园管理者、教师与幼儿家长要统一观念,重视幼儿玩沙活动的价值.幼儿园要组织教师有效开展教研活动,灵活组织玩沙活动,以促进幼儿健康发展.  相似文献   

Numerical Simulation of Dynamic Response and Collapse for Steel Frame Structures Subjected to Blast Load   总被引：4，自引：0，他引：4  

ZHANG Xiuhua    DUAN Zhongdong  ZHANG Chunwei 《天津大学学报(英文版)》2008,(Z1)

The progressive collapse of steel frame structures under the blast load was investigated using LS-DYNA. The multi-material Eulerian and Lagrangian coupling algorithm was adopted. A flu-id-structure coupling finite element model was established which consists of Lagrange element for simulating steel frame structures and concrete ground, multiple ALE element for simulating air and TNT explosive material. Numerical simulations of the blast pressure wave propagation, struc-tural dynamic responses and deformation, and progressive collapse of a five-story steel frame structure in the event of an explosion near above ground were performed. The numerical analysis showed that the Lagrangian and Eulerian coupling algorithm gave good simulations of the shock wave propagation in the mediums and blast load effects on the structure. The columns subjected to blast load may collapse by shear yielding rather than by flexural deformation. The columns and joints of steel beam to column in the front steel frame structure generated enormous plastic defor-mation subjected to intensive blast waves, and columns lost carrying capacity, subsequently lead-ing to the collapse of the whole structure. The approach coupling influence between struc-tural deformation and fluid load well simulated the progressive collapse process of structures, and provided an effective tool for analyzing the collapse mechanism of the steel frame structure under blast load.  相似文献   

Numerical Simulation of Dynamic Response and Collapse for Steel Frame Structures Subjected to Blast Load     

ZHANG Xiuhua  DUAN Zhongdong  ZHANG Chunwei 《天津大学学报(英文版)》2008,14(1)

The progressive collapse of steel frame structures under the blast load was investigated using LS-DYNA.The multi-material Eulerian and Lagrangian coupling algorithm was adopted.A fluid-structure coupling finite element model was established which consists of Lagrange element for simulating steel frame structures and concrete ground,multiple ALE element for simulating air and TNT explosive material.Numerical simulations of the blast pressure wave propagation,structural dynamic responses and deformation,and progressive collapse of a five-story steel frame structure in the event of an explosion near above ground were performed.The numerical analysis showed that the Lagrangian and Eulerian coupling algorithm gave good simulations of the shock wave propagation in the mediums and blast load effects on the structure.The columns subjected to blast load may collapse by shear yielding rather than by flexural deformation.The columns and joints of steel beam to column in the front steel frame structure generated enormous plastic deformation subjected to intensive blast waves,and columns lost carrying capacity,subsequently leading to the collapse of the whole structure.The approach coupling influence between structural deformation and fluid load well simulated the progressive collapse process of structures,and provided an effective tool for analyzing the collapse mechanism of the steel frame structure under blast load.  相似文献   

The Use of Different Translation Devices to Analyze Knowledge-Building in a University Chemistry Classroom     

Barreto  Lucas Passos  Rodrigues  Adriana Araújo Dutra  de Oliveira  Giordanna Camilla Bié  de Almeida  Laila Thayanne Gomes  Felix  Matheus Augusto Campelo  Silva  Penha de Souza  Quadros  Ana Luiza  Macedo  Andrea Mara  Mortimer  Eduardo Fleury 《Research in Science Education》2021,51(1):135-152

Research in Science Education - This research draws on Legitimation Code Theory (LCT) to understand the epistemic dimension of the higher education classroom discourse of a professor who is well...  相似文献