齿轮锻造车间操作分析研究

利用联合操作分析方法对企业锻造过程进行了详细记录,在改善现场设施布局的基础上,对操作过程中人员的配合以及人机的配合进行了分析与改进,提出了新方案。     

论航空维修中的玻璃银纹损伤

银纹,作为飞机客舱外层玻璃的一种损伤形式,在实际维护工作中,易被忽略,从而可能埋下安全隐患。基于此,本文阐述了银纹的形成机理、表现形式和危害,同时论述了检查方法并提出了合理化建议。     

西安f_8地裂缝局部详勘分析

建设场地或场地附近有地裂缝穿过时,工程设计和施工前应进行专门的场地地裂缝勘察。建设在地裂缝场地的建筑物应根据建筑物的重要性类别、结构形式和地裂缝的活动性质合理确定避让距离,以确保建筑物的安全。文章以西安f8地裂缝局部详勘为例,根据次生地裂缝分布在主地裂缝南侧的规律及初勘时所确认的南侧地裂缝坐标,推断场地北侧应该不存在次生地裂缝,据此制订了以南为主、排查北侧的勘察方案。经过现场勘察,确认了场地南侧为主地裂缝、北侧不存在次生地裂缝的推断,缩短了勘察时间并节约了勘察费用,对同类场地的地裂缝勘察有一定的参考作用。     

Election frequency,choice fatigue,and voter turnout

Influential scholars have argued that frequent elections lead to voter fatigue and can therefore be directly responsible for low turnout in countries characterized by frequent contests. However, other theories predict that frequent elections can even increase turnout. The existing empirical evidence is problematic as it simply correlates election frequency with turnout. By contrast, I exploit a natural experiment in the German state of Hesse, where voters from different municipalities faced the same electoral contest but experienced different election frequency, due to the staggered timing of some local elections. I find that when two elections are scheduled within a relatively short period of time, voter turnout at the later election is significantly reduced. This effect is stronger when the election is deemed less important in the eyes of the voters. Election frequency thus might also partly explain the wide turnout gap between first- and second-order elections, as suggested by Lijphart (1997).     

浅论利用科学训练解决体育生疲劳问题

高中的体育教师,常常会面对体育高考生的运动疲劳问题。本文介绍了在实践中总结出来的具有实用性效果的几种恢复疲劳的方式,以供提供借鉴。     

上部无砌体挑梁与砌体开裂原因分析及优化方案

上部无砌体时的挑染，结构计算通常采用简支方案，在其根部与砌体接触面之间易出现裂缝。文章分析了裂经同现的力学原因。并根据力学理论提出了改进办法－采用固端方案。从而大大降低了这类裂缝出现的可能性。     

高层建筑梁柱节点强度等级混凝土不同时的施工方法

随着我国城市化进程的加快，高层建筑随处可见，但是高层建筑框架梁柱节点区混凝土如何浇筑才能满足承载力要求，是长期困扰设计和施工人员的问题，文章为此总结出一种节点区简易施工方法。     

Surgical treatment,complications, and reimbursement among patients with clavicle fracture and acromioclavicular dislocations: a US retrospective claims database analysis

Abstract

Aims: To assess rates of surgical treatment, post-surgical complications, reoperations, and reimbursement in patients with clavicle fractures and acromioclavicular (AC) dislocations.

Materials and methods: This US retrospective study used data from patients with ≥1 diagnosis of clavicle fracture or AC dislocation (index) between 2012–2016. Surgical treatment was defined as a procedure within 4 weeks after clavicle fracture/AC dislocation. Rates of complications (infection, non-union, mal-union), reoperations (device removal or revisions), and all-cause healthcare reimbursement (adjusted to 2016$) were evaluated 2 years post-index among surgical patients.

Results: A total of 95,243 patients with clavicle fracture and 52,100 patients with AC dislocation were identified. Mean (SD) age for clavicle fracture and AC dislocation was 23.8 (18.6) and 33.0 (15.6) years, respectively. Most clavicle fracture and AC dislocation patients were male (70.9% and 78.0%, respectively), and had few comorbidities (86.4% and 84.8% had a Charlson Comorbidity Index?=?0 and 73.1% and 66.0% had Elixhauser?=?0, respectively). Only 15.2% of clavicle fracture and 5.3% of AC dislocation patients received surgical treatment. Among patients undergoing surgical treatment, 2-year rates of infection, non-union, and mal-union were 1.0%, 4.2%, and 0.9%, respectively, for clavicle fracture, and 2.0%, 0.9%, and 0.1%, respectively, for AC dislocation. Reoperations occurred in 83.0% of clavicle fracture and 67.5% of AC dislocation patients. Mean (SD) 2-year reimbursement was $27,635 ($68,173) for clavicle fracture and $23,096 ($28,746) for AC dislocation.

Limitations: Administrative claims data lack clinical information, limiting inferences that can be made. This data may not be generalizable to other patients.

Conclusions: Rates of surgical treatment for clavicle fractures and AC dislocation and rates of infection, non-union, and mal-union among surgically-treated patients were low. However, surgical patients had high rates of device removal or revision surgery during 2-year follow-up. Improved surgical methods and technologies could reduce non-planned reoperations and device removals, thereby reducing healthcare system costs.     

压裂工艺现场施工的质量控制措施

水力压裂是油井实现增产增储、水井实现增注的强有力措施之一。在国内外,水力压裂工艺目前已经非常成熟,但工艺现场施工这个环节的质量控制手段还有待进一步的完善。通过分析华北油田碳酸岩盐水力压裂施工中出现的问题,探讨了如何确保压裂工艺现场施工质量,实现设计与实际的有效衔接。     

聚丙烯纤维网混凝土动力学性能试验研究

本文通过测定聚丙烯纤维网混凝土的抗击性和疲劳特性,对聚丙烯纤维网混凝土的动力学性能分析。结果表明聚丙烯纤维网掺入对提高混凝土抗折强度有显著作用,尤为突出的是其弯曲疲劳性能和冲击韧性大幅提高。