巷道赋存灰白砂岩力学性质试验研究

对于承受四面来压荷载、服务年限较长的巷道工程,获取岩石的物理力学性质具有十分重要的理论及现实意义。通过对南山煤矿现场取样,随后将岩样加工成标准试件进行单轴压缩试验,在常规试验工作的基础上,研究了该矿赋存灰白砂岩的物理力学性质。试验研究结果表明：（1）单轴压缩试验条件下,灰白砂岩抗压强度、弹性模量和泊松比分别为40.55-85.39 MPa、23.6-40.6 GPa、0.22-0.32,并表现出较大差异性;（2）灰白砂岩在单轴压缩试验条件下其破坏形式以竖向劈裂为主,并出现有试样整体破碎现象。该研究结果为巷道工程的掘进、设计及维护提供了有力的基础依据。     

承压式单向阀的设计

针对成品油装车的间断性与离心泵工作的连续性之间的矛盾，对装车流程上的跨线闸阀进行改装，由单向阀改造后的承压式单向阀所代替，从而缓解了离心泵及管线的憋压，提高了装车效率，降低了能源损耗，获得了一定的经济效益。     

“寄言出意”与“以理化情”

阮籍诗歌具有多义性和模糊性的特征,儒家“比兴”的方法已经不能解释他的诗歌。这是因为外在严峻的政局,阮籍不能直抒其意,造成了他的诗歌结构的封闭性。他采用“寄言出意”言说方式,运用与当时流行的道教有关的语汇,构筑了一个象征的世界,使他的诗歌又具有开放性的特点。现实在他的诗歌中,大多是记忆的醉片,并不是写实的,而是为诗歌中的哲理服务的。因此,造成了阮籍诗歌和儒家“比兴”解放方法的错位。这是阮籍诗歌难以理解的重要原因。     

飞鸟意象与阮籍的多重人格

阮籍的《咏怀诗》历来被誉为“旷代绝作”,同时也是绝对的难解之作,“百代之下,难以情测”。而飞鸟则是《咏怀诗》中最重要的诗歌意象,它们是阮籍主体人格的诗性外化,各种飞鸟意象体现着阮籍隐晦难测的内心世界。以飞鸟意象为切入点,揭示阮籍儒家济世理想的破灭与道家逍遥追求的虚幻,展示了其内心世界的孤独、失落与痛苦,从而真实地再现阮籍完整的人格形象。     

颈前路加压螺钉内固定治疗齿状突骨折

目的:探讨颈前路加压螺钉内固定治疗成人齿状突骨折的临床疗效。方法:对15例成人新鲜齿状突Ⅱ型、浅Ⅲ型骨折,在C形臂X线监视下,行前路加压螺钉内固定治疗,分析其治疗效果及并发症。结果:随访8个月~5年4个月,平均11个月,X线片示骨折均获骨性愈合,无明显颈部运动受限,无螺钉断裂、移位及神经损伤等并发症,13例临床症状完全消失,2例因合并颅脑损伤者遗留头痛、头晕。结论:颈前路加压螺钉内固定技术是治疗Ⅱ型、浅Ⅲ型齿状突骨折最佳选择,具有损伤小、并发症少、固定牢靠及愈合率高等优点,正确的选择适应征、充分的术前准备和精细的手术操作是治疗成功的关键,是一种值得推广的手术方法。     

A Turkish profile of prospective elementary school teachers and their views of teaching

This study explores the characteristics and perceptions of those currently entering elementary teacher education in Turkey. A questionnaire consisting of fixed-response, Likert-style and open-ended questions was administered to all entry level elementary teacher education students (n=381) enrolled in the Faculty of Education of Selcuk University during the 2001–2002 academic year to seek information about their background characteristics, past and preferred elementary schooling experiences, reasons for choosing elementary teaching as a career, and perceptions of elementary teaching as a profession. Results indicate that significant differences exist between male and female prospective elementary teachers’ preconceptions of the teaching profession. Implications for preservice teacher education and further research are discussed.     

本钢铸钢缴库作业计划排序软件开发

利用数据库技术,采用工程编号编码方法自动、快速完成铸钢缴库作业计划工程编号、小号的分类和排序。     

Students’ images and their understanding of definitions of the limit of a sequence

There are many studies on the role of images in understanding the concept of limit. However, relatively few studies have been conducted on how students’ understanding of the rigorous definition of limit is influenced by the images of limit that the students have constructed through their previous learning. This study explored how calculus students’ images of the limit of a sequence influence their understanding of definitions of the limit of a sequence. In a series of task-based interviews, students evaluated the propriety of statements describing the convergence of sequences through a specially designed hands-on activity, called the ɛ–strip activity. This paper illustrates how these students’ understanding of definitions of the limit of a sequence was influenced by their images of limits as asymptotes, cluster points, or true limit points. The implications of this study for teaching and learning the concept of limit, as well as on research in mathematics education, are also discussed.     

矿渣水泥强度的预测

用一天水泥抗压强度和矿渣掺加量预报七天水泥抗压强度,其预报曲线为三元二次方程,经过变换后变为二元回归方程,这样就能较容易确立和计算。对于控制矿渣水泥生产,保证其质量有较好的指导作用。     

Cluster parallel rendering based on encoded mesh

INTRODUCTION Three dimensional (3D) meshes are widely used to represent 3D objects. With the rapid advances in digital acquisition technology, meshes with millions of vertices are becoming increasingly common. Be- cause of memory constraints and lack of graphics power, visualizations of this magnitude are difficult or impossible to perform even on the most powerful workstations. Therefore, the need for parallel im- plementation is clear. Most previous work in high performance rendering h…