Statistical analysis on the influence of mechanical parameters in the vibration of pylons

We present a statistical investigation of the degree of influence that assumptions made in relation to the mechanical parameters of a pylon have on its ground-induced vibrations.The study is set up by using as a key kinematic variable the displacement at the top of a reference,a stand-alone pylon with a uniform cross-section and fixity at its base.Next,statistics are produced using a dimensionless displacement ratio defined between the‘parental’and the‘subsidiary’cases,the latter defined for the pylon(a)resting on compliant soil,(b)having an attached top mass,and(c)being non-uniform with height.Furthermore,two materials are examined,namely,steel and reinforced concrete(R/C).More specifically,this displacement ratio is independent of the excitation and plays the role of a transfer function between the base and the top of the pylon.Both horizontal and vertical motions are considered,and the equations of motion are solved in the frequency domain.The ensuing statistical analysis is conducted for the following parameter combinations:(a)pylon founded on soft,intermediate,and stiff soil;(b)low,intermediate,and high-mass ratios of the attached mass to the pylon′s mass;(c)a constant and quadratic degree of pylon tapering with height.Spearman correlation coefficients are calculated for all the above combinations to arrive at statistical results that establish validity bounds and quantify the degree of influence of each assumption on the pylon′s response.

3D Finite Elements Technique for Collapse Causes of the Pylons in Egyptian Temples: A Study of the Great Pylon of Ramesseum Temple, Luxor, Egypt

This research presents damage causes of the pylons in the ancient Egyptian temples based on 3D finite elements analysis. The main purpose of the research determines the failure causes of the first pylon of the Ramessium temple, which is situated in Upper Egypt, at Luxor “Thebes” on the west bank of the Nile River. The first pylon of Ramessium temple subjected to seismic activity effects on long term, combined with several structural damage factors such as the defects resulting from the construction technique, where the builder used the poor quality of stones in foundations of the pylon, the building materials residue was used as filler for the core of the pylon walls, and it lacked vertical joints between the courses. In addition to it founded on alluvial soil that is vulnerable to contaminated water, it is still suffering damage factors and urban trespasses at the moment. All of the former factors helped the pylon to be affected by the earthquakes loads that occurred on it. The structural behavior of the pylon under self-weight and earthquakes loads were carried out by Numerical analysis to find out the loads and stresses which caused collapsing of the pylon. Results of the study indicated that the pylon subjected to a horizontal displacement due to old earthquakes force, led to collapse of the pylon. Finally, the study represents use of modern technique to study the structural behavior of the most important architectural units in ancient Egyptian temples to identify the causes of its collapse.

T型AO外固定架治疗胫腓骨近关节骨折的临床评价

目的 :探讨应用T型AO外固定架治疗距踝关节 4cm以内的胫腓骨骨折及Pylon骨折的临床效果及其影响因素。方法 :分析我科自 1999年 1月～ 2 0 0 1年 2月采用T型外固定架治疗距踝关节 4cm以内的胫腓骨骨折及Pylon骨折 14例。术后早期功能锻炼 ,定期复查 ,有明确骨性愈合后拆除外固定架。结果 :14例病人经随诊 6个月左右 ,10 0 %达到骨性愈合 ,功能恢复完全正常。结论 :T型AO外固定架是非常适合于距踝关节 4cm以内的胫腓骨骨折及Pylon骨折的治疗方法。具有操作简单 ,手术时间短 ,创伤小 ,骨折易愈合 ,固定可靠的优点 ,功能恢复满意。

AO钢板治疗Pylon骨折(附28例报告)

目的 :探讨Pylon骨折AO钢板治疗的优越性及手术要点。方法 :对 1996年 1月～ 2 0 0 0年 10月我院收治的 2 8例Pylon骨折用AO钢板进行手术治疗。结果 :2 8例获得平均 2 5个月的随诊 ,骨折全部愈合 ,总的优良率为 82 .1%。结论 :Pylon骨折应积极采取手术治疗 ,AO钢板内固定疗效佳 ,可保持植骨后胫骨高度。手术中应注意的是先整复固定外踝或后踝 ,再整复胫骨关节面并植骨 ,最后再整复内踝及支撑钢板固定 ,一期可不做关节融合。

GigE Vision接口摄像机及其应用

GigE Vision接口技术成为了机器视觉工业的一项非常具有吸引力的技术,Basler scout系列GigE Vision摄像机具有卓越的性能,Basler提供了Pylon驱动包开发包,可方便用户二次开发。将该摄像机应用于10m水位试验台铟钢尺图像获取并在计算机上显示。

三种方案治疗小儿幽门螺杆菌相关胃病中焦积热证前后C^(13)-呼吸试验DOB值变化

目的:观察三种方案治疗小儿幽门螺旋杆菌(H.Pylori)相关胃病中焦积热证前后的C13-呼吸试验DOB值变化,寻找最佳治疗方案。方法:108例H.Pylori胃病患儿按1∶1∶1对照原则随机分为3组:中药组、西药组和中西药组,每组各36例。中药组口服安幽颗粒(大黄、槟榔、黄连、丹参、香附、白芍);西药组口服克拉霉素、洛赛克;中西药组口服同疗程安幽颗粒加克拉霉素、洛赛克。结果:H.Pylor临床转阴率,中药组、西药组和中西药组分别为38.24%、15.63%、66.67%,中药组与中西药组相比,存在统计学差异;西药组与中药组、中西药组相比,存在显著统计学意义(P<0.05);呼气试验DOB值指标变化方面,西药组与中西药组间存在显著的统计学差异(P<0.01);西药组与中药组间存在显著的统计学差异(P<0.05);中药组与中西药组间存在统计学差异(P<0.05)。结论:中西药结合治疗能使H.Pylori相关胃病中焦积热证小儿C13-呼吸试验DOB值明显下降,并能提高H.Pylori临床转阴率。

Do supplemental perches influence electrocution risk for diurnal raptors?

Background:Power lines are amongst the main causes of mortality for birds globally.Electrocution drives the population dynamics of several threatened species of raptors,at local and global scales.Among the many solutions that have been tested to minimize this threat are supplemental perches;however,their efficiency has rarely been assessed.Methods:We designed 43 transects in 4 districts in mainland Portugal to gather data from birds perching on pylons with or without supplemental perches.From 2015 to 2018,transects were surveyed by car at least once.We analyzed the factors driving the use of these supplemental perches,and we analyzed if there were differences in the perceived risk(calculated from measurements and not from field surveys)depending on whether the perching was on pylons with or without supplemental perches.Results:We recorded 548 perches of 14 species.Weather conditions seemed to play a role in birds’choice of pylons with supplemental perches versus pylons without supplemental perches.Models also indicated a strong influence of observational conditions.The use of models showed us an important specific effect in the selection of supplemental perches where available:there are some species with a greater tendency to perch on supplemental perches,even when they use both pylons with and without supplemental perches.For most of the analyzed species and species groups,perceived risk was higher in pylons without supplemental perches compared to pylons with supplemental perches,but there were differences between species.Conclusions:Supplemental perches may be a useful and efficient tool for mitigating raptor electrocution.However,there are many influential factors affecting their success,and their effectiveness with different species groups is not homogeneous.Some studies show higher electrocution rates for certain species and devices and thus,their efficacy must be validated.We propose a two-step validation process,first in controlled conditions and then in the field.A common protocol should be established to enable comparisons between studies.

Pylon 骨折的诊断与治疗(附45例报告)

Ｐｙｌｏｎ骨折的诊断与治疗（附４５例报告）邓昌茆文（淄博市中心医院，淄博市２５５０３６张店钢铁厂医院）关键词Ｐｙｌｏｎ骨折；内固定；植骨；踝关节融合术Ｐｙｌｏｎ骨折是指由于轴向应力造成的胫骨远端不同程度经关节面的爆裂性骨折。由于胫骨远端爆裂、远端松质...

Development of an Efficient Tapered Slip-Form System Applying BIM Technology

Slip-form system constitutes the latest technology for the erection of elevated concrete pylons. This paper investigates the design of slip-form system applying BIM technology for the efficient development of the slip-form system. The considered pylon has a height of 10 m and presents the rectangular hollow section generally adopted in cable-supported bridges. The slip-form was thus designed to accommodate the tapered cross-section and changing thickness considering the continuous placing of concrete. In addition, the safety of the system was examined with regard to the various loads applied on the slip form along the construction. The design results could be verified visually through BIM and the applicability of the designed slip-form was validated in advance through virtual assembly and construction.

A Study on the Quality Control of Concrete during the Slip Form Erection of Pylon

The construction market of super-high-rise buildings and long-span bridges has recognized unprecedented expansion owing to the development of high performance and high strength materials and the advances achieved in the design and construction technologies. In parallel to the lengthening and enlargement in scale of the structures, securing quality control technology of concrete while reducing the construction duration using improved construction methods emerges as a critical problem for concrete structures. In the erection of concrete pylons, slip forming represents the latest method offering the advantage of reducing drastically the construction duration compared to other methods by adopting automated slip-up of the forms and enabling 24-hour continuous placing. This study determines the slip-up time of the slip form by evaluating the early strength through the surface wave velocity and develops lightweight GFRP form in order to secure the quality of concrete during the slip form erection of pylons. A slip form system is fabricated and mockup test is conducted to verify the performances of the developed techniques through the construction of 10 m-high pylon with a hollow section.

Pylon骨折36例治疗体会

Ｐｙｌｏｎ骨折３６例治疗体会范本植，祁峰Ｐｙｌｏｎ骨折即胫腓骨远端爆裂性骨折，系胫骨远端经距小腿关节（踝关节）的骨折，有别于胫骨下１／３骨折，故被单独命名。临床工作中经常遇到这类骨折，由于对该类骨折认识不足，在治疗上常存在诸多错误，并带来不必要的并发...

Analysis of the Behavior of a HV AC Line during an Atmospheric Discharge and Evaluation of the Spatio-Temporal Distribution of the Lightning Current Wave

In high voltage networks for the transport of electrical energy, lightning, a phenomenon as dangerous as it is impressive, with an easily recognizable form, can affect a power line by striking either a phase conductor, a tower or a guard cable, thus causing more dangerous and constraining stresses on the lines for its proper operation. Thus, this article aims to analyze the behavior of a HV line during an atmospheric discharge and assess the spatial and temporal distribution of the lightning current wave. For this purpose, the generalities on the transmissible power in case of link without resistance and the modeling of the atmospheric surge propagation established on the basis of the theory of the lines with distributed constants implementing the wave equation known as the Alembert equation have been developed. Through this research, we are interested in the study of the space-time distribution of the lightning current wave in order to model the radiated electromagnetic field and to examine the influence of the atmospheric discharge induced overvoltage on the transportable power of a High Voltage AC Transmission line, for a good selective protection in order to illuminate the parasites. The 2D simulation based on engineering and “Transmission Line” models have been developed as well as the verification of the coherence of the different models, by comparing the fractal dimensions of the program results with those of the experimentally obtained figures.

PYLON骨折37例治疗体会

ＰＹＬＯＮ骨折３７例治疗体会山东济宁市第二人民医院（２７２１４９）李庆忠，刘树民我院自１９７８年２月～１９８９年５月共收治ＰＹＬＯＮ骨折病人３７例，应用中西医结合的治疗方法，取得了较为满意的效果。临床资料３７例中男３２例，女５例；年龄１３～５２岁；致...

The Lightweight Design of Low RCS Pylon Based on Structural Bionics

A concept of Specific Structure Efficiency (SSE) was proposed that can be used in the lightweight effect evaluation ofstructures.The main procedures of bionic structure design were introduced systematically.The parameter relationship betweenhollow stem of plant and the minimum weight was deduced in detail.In order to improve SSE of pylons, the structural characteristicsof hollow stem were investigated and extracted.Bionic pylon was designed based on analogous biological structuralcharacteristics.Using finite element method based simulation, the displacements and stresses in the bionic pylon were comparedwith those of the conventional pylon.Results show that the SSE of bionic pylon is improved obviously.Static, dynamic andelectromagnetism tests were carried out on conventional and bionic pylons.The weight, stress, displacement and Radar CrossSection (RCS) of both pylons were measured.Experimental results illustrate that the SSE of bionic pylon is markedly improvedthat specific strength efficiency and specific stiffness efficiency of bionic pylon are increased by 52.9% and 43.6% respectively.The RCS of bionic pylon is reduced significantly.

Interactive Multi-objective Optimization Design for the Pylon Structure of an Airplane

The pylon structure of an airplane is very complex, and its high-fidelity analysis is quite time-consuming. If posterior preference optimization algorithm is used to solve this problem, the huge time consumption will be unacceptable in engineering practice due to the large amount of evaluation needed for the algorithm. So, a new interactive optimization algorithm-interactive multi-objective particle swarm optimization （IMOPSO） is presented. IMOPSO is efficient, simple and operable. The decision-maker can expediently determine the accurate preference in IMOPSO. IMOPSO is used to perform the pylon structure optimization design of an airplane, and a satisfactory design is achieved after only 12 generations of IMOPSO evolutions. Compared with original design, the maximum displacement of the satisfactory design is reduced, and the mass of the satisfactory design is decreased for 22%.

46例胫骨Pilon骨折临床分析

目的探讨胫骨Pilon骨折治疗措施。方法回顾本科收治的46例胫骨Pilon骨折患者的临床资料并进行总结分析。结果优26例,良14例,可5例,差1例。总优良率86.9%。结论胫骨Pilon骨折虽是难治骨折,但通过充分的术前准备,选用合适的手术方法、细致的术中操作、完善的功能训练会达到良好的治疗效果。影响胫骨Pilon骨折手术疗效的相关因素有骨折类型、治疗方式、胫骨关节面的复位情况和手术时机的选择、腓骨骨折的复位和固定因素。有限内固定结合外固定支架能较好地恢复踝关节功能,显著减少伤口并发症及骨不连、延迟愈合等,因此作者认为该手术方式可作为治疗Pilon骨折的首选方法。