Fiberglass Pole Research Articles

Optimization of the Digital Workflow for Obtaining Dental Rehabilitation Devices Obtained by the Cone Beam and 3D Printing

Digital workflow in dentistry is an innovation technique that has made great progress in recent years that provides personalized patient care incorporating CAD/CAM technology (Computed Assisted Design/Computed Assisted Manufacturing) for the visualization and digital manipulation of structures obtained from CBCT (Cone Beam Computed Tomography) or intraoral scanner. This allows to build structures that can help the dentist in treating patients in a personalized way. The digital flow process mainly consists of three pillars: image acquisition, visualization and manipulation of three-dimensional models and 3D printing. This clinical methodology can be used in all fields of dentistry, where the design of anatomical posts to replace the use of conventional fiberglass poles stands out. The above allows to a predictable dynamic of treatment which influences the decrease of risk of fracture due to overload of chewing forces. The digital flow is improved with the integration of bioengineering, the technological and biological knowledge of this discipline allows increasing the effectiveness and efficiency of the process to obtain better results.

Muscle Activation and Torso Movement during Exercise using Novel Fiberglass Resistance Poles

Background: A novel form of functional training utilizes flexible fiberglass poles for resistance. Similar to elastic bands, as the poles flex, resistance increases. To date, no studies have examined activation patterns associated with such implements. Objective: This study examined muscle activation and torso rotation using different pole resistance intensities during a “push-pull” rotational core exercise. Methods: Twenty-one subjects (16 women, 5 men; age=20.4±1.3y) completed 6 trials of 10 repetitions each of a standing push and pull movement with 3 different pole tensions (very light, light, moderate). Muscle activation (electromyography) for the anterior and posterior deltoid, abdominal oblique, and paraspinal muscles were recorded. Concentric contractions during the push phase (PUSH) and the pull load (PULL) phases were recoded, and percent maximal voluntary contraction (%MVC) was computed. Markers on the acromion process and a vertically mounted camera were used to record torso rotation during each push and pull. ANOVA for each muscle and PUSH and PULL was used for comparisons across pole intensity. Results: Significant main effects for torso rotation were seen, with rotation with the very light pole (Push= 61.9 ± 9.20, Pull= 64.8 ± 14.00) significantly greater than moderate (Push= 52.0 ± 12.80, Pull= 54.9 ± 10.10). EMG data were highly variable, with no differences in muscle activation detected across pole resistance loads. Conclusion: Variability of the EMG data prevent clear resolution of activation patterns. However, torso rotation is limited with heavier pole resistance since increased pole flex also increases resistance.

Research Spotlight: Determining the underlying pattern of Arctic snowfall

Across the Arctic terrain, more than a hundred bright orange markers dot the landscape, sticking up from the fallen snow. The fiberglass poles, standing 1.5 meters high and spaced 100 meters apart, allow Sturm and Wagner to track snow depth over their 1‐square‐kilometer research area in Alaska. These depth measurements may be simple, but trying to turn them into a prediction of future snowfall distribution is far more difficult. A rough estimate of the amount of snow expected in an area can be estimated from weather models, but the smaller‐scale distribution of snow across the landscape is often dictated by interactions among wind, topography, and vegetation, factors that models have difficulty simulating. (Water Resources Research, doi:10.1029/ 2010WR009434, 2010)

Ophthalmoplegia associated with transorbital penetrating brainstem injury by broken fishing pole

We report our findings in a case of ophthalmoplegia caused by a transorbital penetrating brainstem injury. An 8-year-old boy was accidentally injured by a broken fishing fiberglass pole which penetrated through the right orbit and entered the brainstem. Magnetic resonance imaging showed a linear wound that entered and passed through the pons obliquely and reached the fourth cerebral ventricle and cerebellar vermis. He had a left-sided hemiplegia and left facial nerve palsy and was diagnosed with “one-and-a-half syndrome”. His hemiplegia and left facial nerve palsy resolved in 2 weeks leaving only a left abducens nerve palsy. The eye position and eye movements fully recovered within 3 months. These findings suggest a good prognosis for this type of trauma unless life-threatening changes develop.

Optimization of pole characteristic in pole vaulting using three-dimensional vaulter model

Pole vaulting has progressed rapidly in terms of mechanical properties and appearance as a result of the use of a flexible fiberglass pole. Various researchers have modeled the vaulter body as a series of rigid-links, limited to a two-dimensional plane. In this research, a combination system consisting of a flexible pole and three-dimensional vaulter model which consists of a rigid-body link with a twist motion is presented. Here, the simulation analysis optimizes the pole characteristics and the joint torque with the application of a Genetic Algorithm. The control parameters were the joint torque and pole stiffness. From the results, it was clarified that there is optimal pole characteristic which is linked to the vaulter’s initial velocity.

The Electrical Degradation of Fiberglass Poles

The Electrical Degradation of Fiberglass Poles

An economical wireless cavity-nest viewer

Inspection of cavity nests and nest boxes is often required during studies of cavity-nesting birds, and fiberscopes and pole-mounted video cameras are sometimes used for such inspection. However, the cost of these systems may be prohibitive for some potential users. We describe a user-built, wireless cavity viewer that can be used to access cavities as high as 15 m and with entrance diameters as small as 2.5 cm. System components include a wireless camera, boom with near-infrared lighting system, hand-held television, and telescoping pole. The unit can be assembled in about one day with commonly available tools, and the total cost was about $850 (US). Our cavity-viewing system was used to monitor the nests of Western Bluebirds (Sialia mexicana) and proved to be reliable and effective. During two field seasons, we attempted to check the status of nests 928 times and were able to determine the nesting stage 901 times (97%). For those willing to assemble their own units, our cavity viewer permits safe, direct examination of cavity nests or open nests for investigators with limited budgets. SINOPSIS. Aparato inhalambrico de bajo costo para observar nidos en cavidades Para examinar nidos en cavidades y cajas de anidamiento, muchas veces es necesario usar instrumentos de fibra ´ optica y cde videos montadas en postes. Sin embargo, el costo de estos sistemas pudiera ser muy elevado para algunos investigadores potenciales. Describimos un aparato inhalque puede ser utilizado para examinar cavidades de hasta 15 m de altura y de 2.5 cm de dien su entrada. Entre los componentes del sistema encontramos una cinhalun sistema de iluminaci´ on infrarojo, un monitor de televisi´ on manual y un poste telescEl sistema puede ser montado en un dia (si hay las herramientas necesarias) y su costo es de $850 dolares. Nuestro sistema fue utilizado para monitorear nidos de Sialia mexicana yp rov´ o ser confiable y efectivo. Durante dos temporadas de campo intentamos determinar el estatus de nidos en 928 ocasiones y pudimos determiner la etapa en que se encontraban en 901 (97%) de estas. Para aquellos que est´ en en la disposicide ensamblar sus propias unidades de monitoreo, nuestro equipo es adecuado y se presta para estudios con presupuesto limitado y le permite al investigador hacer observaciones directas con seguridad.

A26 棒高跳び運動における関節トルクの最適化に関する研究(野球2・他)

The record of pole vaulting has progressed rapidly by the appearance of flexible fiberglass pole. In analysis of the dynamics of the pole vaulting, it is necessary to consider a high flexibility of pole and each joint torque of body. In this research, simulation analysis to optimize the joint torque was done by using Genetic Algorithm. It is introduced a combination system consisted of a flexible pole and seven link (vaulter). From the results, it has been observed that the optimized torque have the tendency.

Added CFO Voltage by the Fiberglass Distribution Line Pole

This paper presents the study results conducted on the critical flashover (CFO) voltages of the fiberglass distribution line pole and its combination with polymer and porcelain insulators. Special attention was made to evaluate the added CFO voltages by the fiberglass pole to the insulators when pole served as a second component in the distribution line structure. A discussion of the results follows the data obtained.

S22 大変形ポールと剛体リンクモデルを用いた棒高跳びのシミュレーション解析(各種スポーツ)

The record of pole vaulting has progressed rapidly by the appearance of flexible fiberglass pole. In analysis of the dynamics of the pole vaulting, it is necessary to consider a high flexibility of pole and each joint torque of body. In this research, simulation analysis of the influence that the movement (joint torque) of the both legs gave pole vaulting was done. It is introduced a combination system consisted of a flexible pole and seven link (vaulter). From the results, it is clarified that the initial conditions (e.g., right leg position of the vaulter) and the applied joint torque during the vault play important roles.

Failure analysis of a pole gin

Lugs on a cast aluminum/fiberglass pole gin failed while raising an electrical transformer on a power pole. This same system had just lowered a heavier transformer. The pole gin consisted of a cast aluminum base that was strapped to a utility pole by a nylon belt-and-ratchet mechanism. A fiberglass pole was mounted in the base, and a pulley was attached to the other end through another aluminum casting. Rigging for the lift was complex and required a physical simulation to estimate actual lug hole loads and to determine that overall loading was within the manufacturer’s published limits. Possible abuse by hammer blows was evaluated by dynamic testing to measure force attenuation in the system. Results ruled out abuse as a factor. Literature revealed that the heat treatable Precedent 71A, or A771-T7 alloy, used for the base casting was very susceptible to stress-corrosion cracking (SCC). Evidence was observed for features indicative of creep-rupture damage on the fracture surface. Evaluation of all of the evidence led to the conclusion that time-dependent crack growth, most likely by both SCC and creep-rupture, plus the effect of bolt hole loading on crack growth could best explain the failure of the gin under a less severe condition than had just occurred earlier in the day.

Analysis of Mechanism of Pole Vaulting. A Fundamental Theory based on A Large Deflection Theory.

The record of pole vaulting has progressed rapidly by the appearance of flexible fiberglass pole. In analysis of the dynamics of the pole vaulting, it is necessary to consider a high flexibility of pole. This report deals with a large deformation problem of pole subjected to concentrated loads at two supporting points. It is introduced a simple combination system consisted of a mass (vaulter) and a pole. Several formulae are derived for vertical and horizontal displacements of the vaulter and so on in terms of elliptic integrals. Moreover, time histories of pole deformation are presented. From the results, it is clarified that the initial conditions (e.g., vertical and horizontal velocities of the vaulter) and the applied bending moment during the vault play important roles.

棒高跳びポールの大たわみ変形挙動と跳躍特性の基礎的研究

The record in pole-vaulting has been improved by using flexible fiberglass poles. In analysis of the dynamics of pole-vaulting, it is necessary to consider the high flexibility of poles. This paper deals with the large deformations of poles subjected to concentrated loads at two supporting points. A simple combination model is introduced which consists of a mass (vaulter) and a pole. Analytical solutions in terms of elliptic integrals are derived for vertical and horizontal displacements. Furthermore, time progress of pole deformation is investigated. From the results, it is clarified that the initial conditions(e.g., vertical and horizontal velocities of the vaulter) and the applied bending moment play important roles.

The Effect of Lay-Up, Core Material, and Cross-Sectional Geometry on the Structural Performance of Pultruded Fiberglass Utility Poles

The structural performance of several pultruded fiberglass utility poles is investigated and compared with wood pole standards. The fiberglass poles are thin-walled tubes with an approximate hexagonal configuration. The outside of the poles have longitudinal grooves which create a dovetail configuration. The dovetails provide a convenient mechanism for attaching crossarms and other hardware to the tubular structure and contribute additional stiffness and strength at these attachment points. Manually operated clamping devices which can run up and down the grooves provide a safe environment for utility linemen. Structural evaluation includes a comparison of axial stiffness, flexural stiffness, maximum load, maximum bending moment, and load-deflection curves for several different pole cross-sectional geometries. Material elastic properties and fiber orientations are varied to determine the effect on structural performance. Several different fiber preforms, including unidirectional rovings and multidirectional fabrics, are evaluated. Results of the analyses are compared with the manufacturer's (Composite Power Corporation) preference in terms of manufacturabilit,. The effect of fiberglass sleeve inserts and solid foam cores is also investigated. Some of the analyses are compared with full scale test data and both the experimental and theoretical results are compared with utility standards for pole design. Failure mechanisms for different loading conditions and future analysis is discussed. Preliminary results show that the composite poles can achieve the standards required for the highest quality wood poles.

Les facteurs de la performance en saut à la perche dans la littérature scientifique

The pole vault is a track and field event which has been the purpose of many scientific studies, especially during the last thirty years and with the coming of the fiberglass pole. All the authors attempted to identify the factors of performance in pole vaulting, either through experimental studies, based on movement kinematic analysis, or by the mean of simulation methods, based on mathematical or physical models. After grouping them under generic designations, a set of 25 parameters, either independent or not, related with the performance in the pole vault, has been registered. Among these, 13 have been identified by at least two authors and were the object of similar conclusions, 4 were the object of opposed conclusions, and 8 were identified by only one author. Among the 4 debated factors, 3 opposed the results of an experimental study with those of one or more simulation methods. The conclusion of this paper does not question the fundamental interest of simulation methods in the optimization of the performance in the pole vault, but precises that they must take into account the interdependence of some parameters in the aim of keeping a tight bond with the actuality of the vault and being used on the field as effective tools for training.

Scientific basis of competitive cross-country skiing

The sport of cross-country skiing had its origins as a utilitarian mode of travel more than 4000 yr ago. From hunters carrying weapons and moving about on carved wooden skis, the sport has evolved to spandex-clad competitors carrying reinforced fiberglass poles while gliding on high-tech composite skis. The widespread use of ski-skating techniques coupled with the technological innovations of the last decade have profoundly changed the nature of competitive cross-country skiing. This symposium is intended to summarize the current state of scientific knowledge about the sport.

Stiffness of fiberglass poles and performance among world-class pole vaulters

Stiffness of fiberglass poles and performance among world-class pole vaulters

A Parametric Solution to the Elastic Pole-Vaulting Pole Problem

The fiberglass pole used in pole vaulting is approximated by an “elastica” having an applied concentrated force and moment at the upper end. Presented is a parametric solution expressed in terms of the tabulated elliptic integrals. The results suggest an advantageous pole-vaulting technique which is not generally recognized by coaches and athletes.

Analysis of Fiberglass Poles for Electric Power Distribution

Developing countries need light-weight power distribution poles which resist deterioration in a hot, humid environment. It is possible that wound fiberglass poles can fill this need and also compete in industrialized countries with poles made of other materials. This paper presents an analysis of fiberglass power distribution poles. It is believed that the poles reported in this paper form the first such distribution line in the Western Hemisphere.

Area Control of the Lone Star Tick with Aircraft Applications of 14% Diazinon Granules, 1981

Abstract Wooded plots (8.75-14.5 a) in eastern OK infested with adults and nymphs were treated on May 12 with aircraft applications of 14% diazinon granules (Diazinon 14G). Applications were made with a single engine, fixed wing aircraft (Cessna Ag Truck) equipped with a conventional, gravity-feed spreader (Transland). The spreader was calibrated in flight for a flow rate of 64 Ib/min at an aircraft speed of 110 mph which delivered target rates for swaths of 60 and 40 ft, respectively, the aircraft was flown at ca 25 ft above the trees. Each swath was marked on each end of each plot with 40 ft telescoping fiberglass poles with white flags.