Journal articles on the topic 'Standard connection'
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Pranata, Yosafat Aji, Anang Kristianto, and Olga Pattipawaej. "Beam-Column Timber Joint Connection Behavior Due to Nail and Modified-Washer Reinforcement Tests." Wood Research Journal 10, no. 1 (June 27, 2020): 6–10. http://dx.doi.org/10.51850/wrj.2019.10.1.6-10.
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Timber connection capacity, in case of beam-column joint connection provides significant impact on the wooden building structures. Strength and stiffness of timber connections using reinforcement technique of wooden building structures have not been studied intensively. This paper studies the use of nails and modified-washer to improve wood connection’s performance. The experimental tests were conducted in the laboratory by comparing the partial connection between test specimen timber without reinforcement (standard type) and the reinforcement (PRP type). The testing was conducted based on partial connection beam-column joint test using Universal Testing Machine’s with a modified holder. Wood studied includes Meranti (Shorea spp.) and Mersawa (Anisoptera spp.). PRP type connection was using nails and modified-washer strengthening, and standard type connection was using a classic washer. Parameters studied were strength and stiffness of the connection, reviewed both: proportional limit load and ultimate limit load conditions. Result obtained from this research indicates that the use of nails and modified-washer make a positive contribution to improving the performance of the beam- column timber joint connections, in terms of strength capacity (both of proportional limit and ultimate limit loads) and stiffness capacity (displacement ductility ratio). Meranti beam-column timber joint is more brittle than Mersawa beam column timber joint, it has an impact on the results. PRP-type of Mersawa timber connection produces a higher ductility than the standard type, while the PRP-type of Meranti timber connection produces a similar ductility to the standard type.
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Scannell, Jack W., Simon Grant, Bertram R. Payne, and Roland Baddeley. "On variability in the density of corticocortical and thalamocortical connections." Philosophical Transactions of the Royal Society of London. Series B: Biological Sciences 355, no. 1393 (January 29, 2000): 21–35. http://dx.doi.org/10.1098/rstb.2000.0547.
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Variability is an important but neglected aspect of connectional neuroanatomy. The quantitative density of the ‘same’ corticocortical or thalamocortical connection may vary by over two orders of magnitude between different injections of the same tracer. At present, however, the frequency distribution of connection densities is unknown. Therefore, it is unclear what kind of sampling strategies or statistical methods are appropriate for quantitative studies of connectivity. Nor is it clear if the measured variability represents differences between subjects, or if it is simply a consequence of intra–individual differences resulting from experimental technique and the exact placement of tracers relative to local spatial and laminar variation in connectivity. W e used quantitative measurements of the density of a large number of corticocortical and thalamocortical connections from our own laboratories and from the literature. V ariability in the density of given corticocortical and thalamocortical connections is high, with the standard deviation of density proportional to the mean. The frequency distribution is close to exponential. Therefore, analysis methods relying on the normal distribution are not appropriate. W e provide an appendix that gives simple statistical guidance for samples drawn from exponentially distributed data. For a given corticocortical or thalamocortical connection density, between–individual standard deviation is 0.85 to 1.25 times the within–individual standard deviation. Therefore, much of the variability reported in conventional neuroanatomical studies (with one tracer deposited per animal) is due to within–individual factors. W e also find that strong, but not weak, corticocortical connections are substantially more variable than thalamocortical connections. We propose that the near exponential distribution of connection densities is a simple consequence of ‘patchy’ connectivity. W e anticipate that connection data will be well described by the negative binomial, a class of distribution that applies to events occurring in clumped or patchy substrates. Local patchiness may be a feature of all corticocortical connections and could explain why strong corticocortical connections are more variable than strong thalamocortical connections. This idea is supported by the columnar patterns of many corticocortical but few thalamocortical connections in the literature.
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RODRIGUES, Mariana Ferreira, José CORREIA, Bruno PEDROSA, Abílio DE JESUS, Bruno CARVALHO, Carlos REBELO, José XAVIER, and Rui CALÇADA. "NUMERICAL ANALYSIS OF A DOUBLE SHEAR STANDARD BOLTED CONNECTION CONSIDERING MONOTONIC LOADINGS." Engineering Structures and Technologies 9, no. 4 (December 21, 2017): 183–94. http://dx.doi.org/10.3846/2029882x.2017.1414638.
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The behaviour of standard bolted steel connections submitted to monotonic loads, through the use of numerical models, is presented in the current paper. The bolted connections allow speed up constructive processes in an increasingly competitive and globalized world in which the costs are a decisive factor in the development of a project. The use of computational tools in the analysis of bolted connections becomes determinant, mainly for new solutions or solutions less explored in terms of design codes. Throughout the years, bolted connections have been suffering transformations resulting from research activities performed by many authors. Rivets have been replaced by bolts, the main achievement being the pre-stressed bolts. Methodologies based on finite element analyses were proposed for double shear bolted connection. The non-linear behaviour of these connections is investigated and their performances are compared. In the numerical modelling of the bolted connection, linear elastic and elastoplastic analyzes reveal that there are two slip levels associated with local non-linearities caused by the contact pairs, which vary with clamping stresses.
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Morris, Glenn, Jitian Huang, and Mario Scerbo. "Accounting for connection behavior in steel frame design." Canadian Journal of Civil Engineering 22, no. 5 (October 1, 1995): 955–69. http://dx.doi.org/10.1139/l95-112.
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The behavior of a steel frame may be affected significantly by the moment versus rotational deformation (M–ϕ) behavior of its beam-to-column connections. Some of the effects of connection behavior are described and demonstrated. Because connection behavior is nonlinear and relatively difficult to model analytically, generally applicable analytical behavior models are not available. Nor, despite the availability of more than 300 experimentally measured connection M–ϕ data sets, are generally applicable empirically based behavior models available. Consequently, connection behavior continues to be accounted for only crudely in North American design specifications and in frame design. This paper describes a three-step strategy that would eventually permit the M–ϕ behavior of beam-to-column connections to be accounted for explicitly and routinely in steel design specifications and thus in frame design. The first step, to express connection M–ϕ behavior in a compact form suitable for incorporation into frame analysis software, has been demonstrated by curve fitting 274 experimental M–ϕ data sets to a specially developed function that requires only six parameters to describe connection behavior. The second step, to illustrate graphically the ranges of M–ϕ behavior exhibited by the common connection. types, and thereby to help designers to develop a "feel" for connection behavior, has been demonstrated by comparing the M–ϕ plots to the EUROCODE3 connection classification boundaries. The third step, to blend the standard connection geometries that have been developed in several countries into an international menu of standard connection geometries and, eventually, to generate and curve fit reliable experimental M–ϕ data for all of the standard connections, is summarized. Key words: beam-to-column connections, connection behavior, steel frames, structural analysis, steel design.
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Shaheen, Mohamed A., Mohamed Ahmed Galal, Lee S. Cunningham, and Andrew S. J. Foster. "New Technique to Improve the Ductility of Steel Beam to Column Bolted Connections: A Numerical Investigation." CivilEng 2, no. 4 (October 22, 2021): 929–42. http://dx.doi.org/10.3390/civileng2040050.
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A novel method to improve the robustness of steel end plate connections is presented in this paper. Existing commonly adopted techniques alter the stiffness of the beam or the end plate to improve the connection’s robustness. In this study, the robustness is enhanced by improving the contribution of the bolts to the rotational capacity of connections; the higher the bolts’ elongation, the higher the rotational capacity that can be achieved. However, the brittleness of the bolt material, combined with its small length, results in negligible elongation. Alternatively, the load path between the end plate and the bolts can be interrupted with a ductile element to achieve the required elongation. This can be achieved by inserting a steel sleeve with a designated length, thickness, and wall curvature between the end plate and the washer. The proposed sleeve should be designed so that its ultimate capacity is less than the force in the bolt at failure; accordingly, the sleeve develops a severe bending deformation before the failure of any connection components. Using a validated finite element model, end plate connections with various parameters are numerically investigated to understand the performance of the sleeve device. The proposed system substantially enhances the rotational capacity of the connections, ranging between 1.37 and 2.46 times that of the standard connection. It is also concluded that the sleeved connections exhibit a consistent elastic response with the standard connections, indicating the proposed system is compatible with codified elastic design approaches without modification. Furthermore, for a specific connection, various ductile responses can be achieved without altering the connection capacity nor configuration.
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Morris, Glenn A., and Jeffrey A. Packer. "Beam-to-column connections in steel frames." Canadian Journal of Civil Engineering 14, no. 1 (February 1, 1987): 68–76. http://dx.doi.org/10.1139/l87-009.
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The importance of beam-to-column connections in determining the load–deformation behaviour of steel building frames has been recognized for more than 70 years. Yet steel design specifications, including Canadian Standard Association standard CAN3-S16.1-M84, still mandate that connections be treated as either "pinned" or "rigid," and prescribe approximate design assumptions accordingly. Structural analysis procedures and tools exist that can account adequately for connection behaviour. What is not complete is the knowledge of the force–deformation behaviour of the various connection types.In this paper, what is known of the force–deformation behaviour of the commonly used connection types is described. The factors influencing that behaviour are outlined. Procedures for modelling connection behaviour and for incorporating it into structural analysis computer programs are described. The effects of connections on the behaviour of the overall structure are described and illustrated with examples. Finally, the areas where additional research is needed are discussed. Key words: connections, steel, structural analysis, columns, semirigid design.
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Faflei, О. Ya, R. О. Deynega, G. Ya Protsiuk, V. V. Mykhailiuk, V. О. Melnyk, and Ye М. Faidash. "Analysis and improvement of the design of uninterrupted connection of pump rods." Scientific Bulletin of Ivano-Frankivsk National Technical University of Oil and Gas, no. 1(50) (June 27, 2021): 34–41. http://dx.doi.org/10.31471/1993-9965-2021-1(50)-34-41.
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Based on the field data, numerous failures of the downhole equipment of sucker rod pumping units occur, especially of the sucker rod strings. They are subject to corrosion, wear and alternating loads. The stress-strain state of the threaded connection elements is determined by the nature of the distribution of loads along the threads, which is uneven and depends on many factors. Despite this, the development of new designs of sucker rod connections and measures to improve the efficiency of operation and their research is an urgent task. In addition to the threaded connections of the sucker rods, there were a number of threadless designs that were not used in the fields, but they passed certain tests. The article presents these connection designs and discusses their advantages and disadvantages in comparison with standard threaded connections. Simulation modeling of a standard connection of sucker rods made it possible to investigate its stress-strain state and identify hazardous areas (stress concentrators). The stress-strain state of the threaded connection of the sucker rods has been investigated, the design of this connection has been improved and it has been established that, in comparison with the standard threaded connection of the sucker rods, the investigated has certain advantages. It was found that with an increase in the number of protrusions and depressions in a threaded joint, stresses decrease, which are concentrated in dangerous sections and along the contact planes. Convex contact planes also reduce stress, especially at the joint surface. Research has shown that the stresses generated in a threadless sucker rod joint are less than the stresses generated in a standard sucker rod and sleeve joint. Although the difference between these stresses is insignificant, attention should be paid to changing the geometric parameters of the threadless connection of the sucker rods, thereby reducing the maximum stresses.
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Lo, D. S. K., and S. F. Stiemer. "A practical method for incorporating flexible connections in plane frame analysis." Canadian Journal of Civil Engineering 22, no. 5 (October 1, 1995): 871–82. http://dx.doi.org/10.1139/l95-105.
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A practical method for incorporating realistic flexible connections in plane frame analysis, including the effect of connection sizes and shear deflection, is presented. The general algorithm can be easily implemented in a standard plane frame analysis program and, once implemented, it can be an ideal tool for production work in the steel industry. Connection stiffness is programmed directly into the analysis using the moment–rotation equations developed by Frye and Morris or may be entered separately as data. Practical application of this method of analysis is demonstrated by modifying a standard plane frame analysis program to include the effect of flexible connections. Solutions obtained using this modified program, CPlane, were verified against the findings of Moncarz and Gerstle. A simple plane frame structure was analyzed under various lateral load intensities for different connection assumptions. It was found that the inclusion of connection behavior significantly altered the internal force distribution and design of the structure. Key words: connections, matrix frame analysis, moment–rotation relations.
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Liu, Weiming, and Sanjiang Li. "On standard models of fuzzy region connection calculus." International Journal of Approximate Reasoning 52, no. 9 (December 2011): 1337–54. http://dx.doi.org/10.1016/j.ijar.2011.07.001.
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Grabski, Maciej, and Andrzej Ambroziak. "Shear Cap Size Selection Method Based on Parametric Analysis of ACI-318 Code and Eurocode 2 Standard." Materials 13, no. 21 (November 3, 2020): 4938. http://dx.doi.org/10.3390/ma13214938.
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The scope of the paper is to propose a method for determining the size of shear caps in a slab–column-connections-reinforced concrete structure. Usually, shear heads are used to enhance slab–column connection, especially when the transverse reinforcement does not give the required punching shear load capacity. The dimensions of the shear head should provide the punching shear resistance of the connection inside and outside the enhanced region. The process of selecting the size of the shear head is iterative. The parametric analysis of the ACI 318 code and EC2 standard has the objective of indicating which control perimeter (inside or outside the shear head) has a decisive impact on the punching shear capacity of the connection. Based on the analysis, the authors propose methods for selecting the dimensions of the shear head with practical application examples. The paper is intended to provide scientists, civil engineers, and designers with guidelines to design the process of the slab–column connections with the shear caps.
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Dees, Raluca, Angela Merzweiler, Gerd Schneider, Martin Kasparick, Lars Mündermann, Janko Ahlbrandt, Martin Wagner, Hannes Kenngott, Beat Müller-Stich, and Björn Bergh. "Implementing, Connecting, and Evaluating a Standard-Based Integrated Operating Room within a German University Hospital." ACI Open 02, no. 01 (January 2018): e10-e20. http://dx.doi.org/10.1055/s-0038-1639604.
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Background Digital operating rooms (ORs), when optimally designed and integrated, can reduce the complexity of the surgery suite. However, many integrated ORs are effectively isolated from other IT systems in the hospital because there is little or no connectivity with them. Within the German flagship project OR.NET, concepts and components were developed for a standard-based connection of the OR with hospital IT systems. Objectives The aim of this work was to implement and evaluate OR.NET concepts and components within the existing IT landscape of a German university hospital. This article describes and evaluates the implemented architecture and processes for connecting a demo OR to existing hospital IT systems at Heidelberg University Hospital. Methods For the design, establishment, and evaluation of standard-based connections of the demo OR with hospital IT systems, the iterative method “Design and Creation” with four iterations was applied. Results A generic and a concrete architecture for several standard-based connection concepts of the demo OR were developed. Furthermore, the concrete architecture was implemented and evaluated for its technical and clinical relevance. The main benefits of the project were the establishment of basic requisites for improving the efficiency within the OR, easier operation of medical devices as a result of harmonized human–machine interfaces, and providing additional data for improving healthcare. Conclusion OR.NET concepts for a standard-based connection of the OR with hospital IT systems have proven to be promising. They can serve as a reference for further integration scenarios in other hospitals.
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Robaszewska, Maria. "Affine analogues of the Sasaki-Shchepetilov connection." Annales Universitatis Paedagogicae Cracoviensis. Studia Mathematica 15, no. 1 (December 1, 2016): 37–49. http://dx.doi.org/10.1515/aupcsm-2016-0004.
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AbstractFor two-dimensional manifold M with locally symmetric connection ∇ and with ∇-parallel volume element vol one can construct a flat connection on the vector bundle TM ⊕ E, where E is a trivial bundle. The metrizable case, when M is a Riemannian manifold of constant curvature, together with its higher dimension generalizations, was studied by A.V. Shchepetilov [J. Phys. A: 36 (2003), 3893-3898]. This paper deals with the case of non-metrizable locally symmetric connection. Two flat connections on TM ⊕ (ℝ × M) and two on TM ⊕ (ℝ2 × M) are constructed. It is shown that two of those connections – one from each pair – may be identified with the standard flat connection in ℝN, after suitable local affine embedding of (M,∇) into ℝN.
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Lai, Chi-Ming, Ching-Yu Yeh, Sin-Yu Kang, and Heui-Yung Chang. "Effects of Shear Tabs and High-Strength Bolts in Seismic Performance of Steel Moment Connections." Buildings 11, no. 9 (September 17, 2021): 415. http://dx.doi.org/10.3390/buildings11090415.
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A shear tab and high-strength bolts are often used to connect a steel H-beam to a column. The design demand and capacity of these elements vary from one standard to the other. To investigate the effect, this study applied a finite element method (FEM) to develop models for two steel moment connections and validated the effectiveness by test data. The connections were characteristic of bolted-web-and-welded-flange details. The FEM models were then used to study the design of shear tabs and high-strength bolts in accordance with the U.S. and Japan standards and compared to the Taiwan practice. The result showed a small difference in the peak loads of the connections. However, the U.S. direct welded flange connection had flange buckling and strength degradation at a relatively smaller drift. The connection had a thinner shear tab and fewer high-strength bolts. The other two connections had very similar design results and loading responses. The increase in shear-tab thickness reduced the stress concentration and fracture potential of the connections. It is, therefore, recommended to design a shear tab with moment capacity greater than the beam web. This will reduce the stress concentration of the base metal surrounding the beam-flange groove welds, increasing the connection ductility.
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Li, Jun, and Cheng Yu Li. "Studying on the Tension Distribution of High Strength Bolted Endplate Connections." Applied Mechanics and Materials 696 (November 2014): 8–11. http://dx.doi.org/10.4028/www.scientific.net/amm.696.8.
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The tension distribution of high-strength bolted extended endplate connections does not have unified regulations in china, the assuming tension distribution between the "Code for Design of Steel Structure"(GB50017-2003) and the "Specification of High Strength Bolt Connection of Steel Structures"(JGJ82-2011) are different, it may lead some problems in practical engineering. "Specification of High Strength Bolt Connection of Steel Structures"(JGJ82-2011) has given the assumed tension distribution ,but has not given formula .But its distribution assumption is the same as the British Standard ,so the calculation is given below reference to British Standard. Comparing their calculation methods and referencing to the British Standard ,the latter distribution is more reasonable.
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Abrarov, R. R., and M. E. Burlakov. "ORGANIZATION OF A DECENTRALIZED AND ANONYMOUS MESH NETWORK." Vestnik komp'iuternykh i informatsionnykh tekhnologii, no. 192 (June 2020): 42–47. http://dx.doi.org/10.14489/vkit.2020.06.pp.042-047.
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As part of this work, proposed the Mesh network architecture, which provides decentralization, security, anonymity and connection of devices without a dedicated router or Internet access. The nodes establish connections directly using Android P2P Wi-Fi technology, which complies with the Wi-Fi Direct standard. P2P Wi-Fi API organizes group communication and allows applications to connect to neighboring devices without the need for an Internet connection or access point. Despite the fact that in the Wi-Fi Direct standard there are no restrictions on connecting groups to each other, the Android Wi-Fi P2P API does not allow organize a connection between several groups. This is due to the fact that the IP addresses of owners of different groups in Wi-Fi Direct are always the same and unchanged. Communication between a P2P client and an inherited client that also owns another group is allowed in both directions. This provides connections between groups, where a P2P client acts as a proxy to access a neighboring group. Thus communication between nodes in a multigroup network is ensured through the use of transport layer tunnels installed in the logical topology and packet switching at the application level. When one or more nodes access the Internet, remote nodes outside the Wi-Fi coverage area communicate with the mesh through the application server. This architecture allows build a corporate, public or home network based on a wireless Mesh network, the nodes of which can be access points, computers and mobile devices of users.
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Abrarov, R. R., and M. E. Burlakov. "ORGANIZATION OF A DECENTRALIZED AND ANONYMOUS MESH NETWORK." Vestnik komp'iuternykh i informatsionnykh tekhnologii, no. 192 (June 2020): 42–47. http://dx.doi.org/10.14489/vkit.2020.06.pp.042-047.
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As part of this work, proposed the Mesh network architecture, which provides decentralization, security, anonymity and connection of devices without a dedicated router or Internet access. The nodes establish connections directly using Android P2P Wi-Fi technology, which complies with the Wi-Fi Direct standard. P2P Wi-Fi API organizes group communication and allows applications to connect to neighboring devices without the need for an Internet connection or access point. Despite the fact that in the Wi-Fi Direct standard there are no restrictions on connecting groups to each other, the Android Wi-Fi P2P API does not allow organize a connection between several groups. This is due to the fact that the IP addresses of owners of different groups in Wi-Fi Direct are always the same and unchanged. Communication between a P2P client and an inherited client that also owns another group is allowed in both directions. This provides connections between groups, where a P2P client acts as a proxy to access a neighboring group. Thus communication between nodes in a multigroup network is ensured through the use of transport layer tunnels installed in the logical topology and packet switching at the application level. When one or more nodes access the Internet, remote nodes outside the Wi-Fi coverage area communicate with the mesh through the application server. This architecture allows build a corporate, public or home network based on a wireless Mesh network, the nodes of which can be access points, computers and mobile devices of users.
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Wang, Jianyong, Lei Zhang, Yuanyuan Chen, and Zhang Yi. "A New Delay Connection for Long Short-Term Memory Networks." International Journal of Neural Systems 28, no. 06 (June 24, 2018): 1750061. http://dx.doi.org/10.1142/s0129065717500617.
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Connections play a crucial role in neural network (NN) learning because they determine how information flows in NNs. Suitable connection mechanisms may extensively enlarge the learning capability and reduce the negative effect of gradient problems. In this paper, a new delay connection is proposed for Long Short-Term Memory (LSTM) unit to develop a more sophisticated recurrent unit, called Delay Connected LSTM (DCLSTM). The proposed delay connection brings two main merits to DCLSTM with introducing no extra parameters. First, it allows the output of the DCLSTM unit to maintain LSTM, which is absent in the LSTM unit. Second, the proposed delay connection helps to bridge the error signals to previous time steps and allows it to be back-propagated across several layers without vanishing too quickly. To evaluate the performance of the proposed delay connections, the DCLSTM model with and without peephole connections was compared with four state-of-the-art recurrent model on two sequence classification tasks. DCLSTM model outperformed the other models with higher accuracy and F1[Formula: see text]score. Furthermore, the networks with multiple stacked DCLSTM layers and the standard LSTM layer were evaluated on Penn Treebank (PTB) language modeling. The DCLSTM model achieved lower perplexity (PPL)/bit-per-character (BPC) than the standard LSTM model. The experiments demonstrate that the learning of the DCLSTM models is more stable and efficient.
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Mirada, Asher. "Confidence and its Connection to Demography Influence." American Journal of Social Science and Education Innovations 03, no. 04 (April 17, 2021): 71–74. http://dx.doi.org/10.37547/tajssei/volume03issue04-10.
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Problem proclamation: Social confidence is the primary topic in the public activity. Confidence is "the assumption that emerges inside a local area of standard, legit and agreeable conduct, in view of regularly shared standards". Advancement, social confidence and security are interlaced classifications and have cooperation to one another. Social confidence, as a primary factor in friendly capital, gives social setting to formative projects. This investigation, analyze the effect of Demography variables on the social confidence to other people. As friendly confidence is a vital factor in friendly connection, this investigation is expected to assess such factor as indicated by segment influence. Approach: This examination has been done on existing information about Iranian qualities and mentalities. A few influence like sexual orientation, age, schooling level, work circumstance, conjugal circumstance have been concentrated in this examination. A portion of these influence like training, correspondence to advancement level, particularly in friendly turn of events. Results: Findings of this examination demonstrated that there is huge connection between all of autonomous influence (Gender, age, training level, work circumstance, conjugal circumstance) and social confidence to families and family members, there is critical connection between influence like sexual orientation, schooling level, work circumstance, conjugal circumstance (free influence) and social confidence to companions. Investigating the information showed that, the occupants of less and more created urban areas have distinctive circumstance in confidence. End/Recommendations: This examination presents three kinds of confidence upon the advancement level of social orders. Confidence in Iran is an illustration of confidence structure in creating social orders.
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Zhang, Shao Qin, and Lei Wu. "Numerical Analysis of the Influence of the Padding-Plate on the Extended End-Plate Connection." Applied Mechanics and Materials 578-579 (July 2014): 505–8. http://dx.doi.org/10.4028/www.scientific.net/amm.578-579.505.
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In the present paper, we investigate the effect of a padding-plate on the behavior of extended end-plate semi-rigid connections. The numerical simulations were carried out for a standard extended end-plate connection joint without padding-plate and two connection joints with 4mm and 6mm thick padding-plates. The existing experimental results verified the validity of the numerical model. The numerical results have shown that a thin padding-plate will more or less decline the carrying load capacity of the connection joint but greatly improve the connect ductility. Filling a thin padding-plate in the end-plate connection is feasible and brings the forewarning function.
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Chen, Chen, Zhangning Ye, Xiaohong Yu, Onder Tor, and Jilei Zhang. "Cyclic behavior of self-tapping screwed laminated bamboo lumber connections subjected to cycle loadings." BioResources 14, no. 4 (August 16, 2019): 7958–76. http://dx.doi.org/10.15376/biores.14.4.7958-7976.
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Self-tapping screws are commonly used to connect critical structural components, such as legs to rails in chair construction, using laminated bamboo lumber (LBL) materials. The loosening of a connection is commonly seen in self-tapping screwed LBL connections before actual breakage of connections happens. The loosening of connections, especially those associated with chair legs, can significantly affect chair stability. Current furniture performance test standards have not address this issue, i.e., the minor loosening of a connection is not treated as a failure in the current standard because of the lack of better understanding the load-rotation-time behavior of various connections subjected to the cyclical loads. The effects of cyclic loading magnitude and orientation on the load-rotation-time behavior of L-shaped, end-to-side, single self-tapping screwed LBL connections were investigated. Results indicated that the Burger and Kelvin models could be used to describe the cyclic and recovery behavior of studied connections. Increasing the cyclic loading magnitude resulted in a decreasing trend for all viscoelastic constants. The most significant decrease in all viscoelastic constants occurred when the cyclic loading magnitude applied to connections increased from 50 to 60% of its corresponding ultimate static resistance loads.
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Giannangelo, Kathy. "Making the Connection between Standard Terminologies, Use Cases, and Mapping." Health Information Management Journal 35, no. 3 (November 2006): 8–12. http://dx.doi.org/10.1177/183335830603500304.
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Lafrance, David. "Standard Methods , George Fuller, and Cuba: What Is the Connection?" Journal - American Water Works Association 104, no. 3 (March 2012): 6. http://dx.doi.org/10.1002/j.1551-8833.2012.tb08824.x.
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Faeq Hammoodi, Husam. "INTERNATIONAL STANDARD AND ITS CONNECTION TO DESIGN LIMITATIONS OF MOTORCYCLES." Route Educational and Social Science Journal 8, no. 62 (January 1, 2021): 203–19. http://dx.doi.org/10.17121/ressjournal.2996.
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Abd Rahman, Norashidah, and Walid Tizani. "Fatigue Performance of Blind Bolt in Concrete-Filled Hollow Section." Applied Mechanics and Materials 421 (September 2013): 762–66. http://dx.doi.org/10.4028/www.scientific.net/amm.421.762.
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The strength performance of a blind bolt connection has been investigated under monotonic and cyclic loadings. However, the performance of these connections under fatigue loading remains unknown and is currently being studied. This paper examines and provides a better understanding of the fatigue performance of a blind bolt in a concrete-filled hollow section. A number of tests are conducted to determine the fatigue life of the blind connection in the concrete-filled tube. Comparison is made with the fatigue performance of a standard bolt. Analysis of the result indicates that the extended hollobolt has longer life than the hollobolt and lower fatigue life than those of the standard bolt.
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Lee, Anita N. "Evaluation of Stakeholders of Athletic Programs: A connection to Standard 40, National Standards for Sport Coaches." Journal of Coaching Education 3, no. 2 (August 2010): 99. http://dx.doi.org/10.1123/jce.3.2.99.
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Coaches’ achievement is commonly evaluated by competition results or winning percentages. Teams with high winning percentages, rankings, or outstanding competition results are not only contributed by coaches, but also efforts of athletes and other stakeholders. The Standard 40 of the National Standards for Sport Coaches (2006) is to “utilize an objective and effective process for evaluation of self and staff,” which requires coaches to have the knowledge, abilities, and skills (KASs) to “collect direct feedback from athletes and identify ways to improve techniques and coaching style” and being able to perform “self-evaluation for professional growth and development” (NASPE, 2006, p. 23). The benchmarks of Standard 40 include input that should be collected from all stakeholders, such as athletes, parents, guardians, athletic administrators, and other coaches (NASPE, 2006). An effective program requires a coach to have effective communication skills, inter- and intra-personal interaction skills, leadership, and administrative skills, be able to provide positive and corrective feedback to athletes, and have the KASs to coach a sport in a selected competitive level. Evaluation methods are categorized into self-evaluation and evaluation by others, which include journals/dairies, video-analyses, checklists, surveys, and meetings/discussions. The advantages of journals/diaries are short and easy to write, and easy to retrieve and re-read, but coaches may not spend time to re-read them again. Video analyses are a great tool to allow multiple evaluators to observe coaching performance without time limit. Videos can be replayed, played in slow motion, placed online, and emailed to other evaluators to save travel time and cost. However, video analyses are time consuming to watch. It also requires video-taping equipments and skills. Checklists and surveys are easy to use, and can be used with a large number of participants, but they require specific skills to develop valid and reliable instruments. The response rate may be low unless the stakeholders are mandated to complete and return the checklists and surveys. Meetings and discussions allow direct feedback collection and conversations, but they could be redundant unless concise meeting agenda and discussion questions are designed.
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Lou, Qi, Fang Po Li, Wei Du, and Ming Hua Liang. "Thread Galling Damage Mechanism and Prevention of a Low Alloy Steel Tubing Connection." Materials Science Forum 1035 (June 22, 2021): 430–35. http://dx.doi.org/10.4028/www.scientific.net/msf.1035.430.
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The pull out and well drop accident caused by serious thread galling damage of low alloy steel tubing connections were investigated in this paper. Representative samples were selected from five failure accidents, and the test and verification program were designed. Based on the experiment and analysis it is considered that the material used for tubing and the quality of thread processing meet the requirements of the standard. The field end of tubing connection pull out may be due to the serious thread galling damage, which reduced the joint strength. Using the torque-position control method to make-up the thread connections in oil field may ensure the connection quality and the connection strength, meanwhile, and hence to avoid the occurrence of tubing pulling out effectively.
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Kriviak, Gary J., and D. J. Laurie Kennedy. "Standardized flexible end plate connections for steel beams." Canadian Journal of Civil Engineering 12, no. 4 (December 1, 1985): 745–66. http://dx.doi.org/10.1139/l85-089.
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A flexible end plate connection consists of a plate fastened to both sides of the web of a beam by fillet welds. Bolted field connections are used. The connection should transmit vertical shear and allow beam end rotations to occur without the development of significant moments. It is common practice to evaluate the shear capacity of these connections neglecting the presence of secondary forces, which can develop when the connection rotates.Existing analytical models of the moment–rotation behaviour correlate well with test results. These models consider both the flexural and membrane response of the connection in the upper tensile zone and use an empirical relationship to predict the force developed in the lower compression zone. In some tests undesirable impairment of connection flexiblity occurred when the bottom flange of the beam contacted the support.A limit states design model has been developed, which better predicts the moment–rotation characteristics of the connection and which also predicts the reduced vertical shear capacity of the connection due to secondary forces. Consideration of the secondary forces results in connections being designed with more consistent safety levels.An interactive computer program has been developed to design flexible end plate connections using this model. The program is attached to a data file containing the geometric properties of all standard steel flexural shapes available in North America. By specifying any of these shapes along with the desired material properties, loading conditions, connection geometry, and associated connection component costs, a designer can use the program to rapidly prepare customized connection designs or design tables. Key words: beams, connection, end plate, flexible, interactive computer program, joints, limit states design method, plastic deformation, shear strength, steel structures, structural analysis, structural design.
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Sağıroğlu, Merve, Mahyar Maali, Abdulkadir Cüneyt Aydın, and Mahmut Kılıç. "Moment-rotation behavior of semi-rigid web cleat connections." Challenge Journal of Structural Mechanics 6, no. 3 (September 8, 2020): 110. http://dx.doi.org/10.20528/cjsmec.2020.03.002.
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The behavior of beam-column semi-rigid connection plays an important role in the response of a steel moment resisting, stiffness and rotation capacity framed structure, especially under static loading conditions. In this study, the moment-rotation characteristics of semi-rigid bolted connections using web cleat connections with IPE standard profile is discussed, based on the experimental investigation. The study revealed that the moment resistance of beam-column semi-rigid connection is improved by increasing the height of the beam to the height of web cleat joint (H), and the increasing thickness of web and flange in web cleat joints. The aim was to provide necessary data to improve the Eurocode 3 and efficiently use residue IPE standard profiles, rather than send them back to the consumption cycle. While the resistance moment increased with an increase in H from Hmin to Hmax.
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Moses, D. M., and H. G. L. Prion. "A three-dimensional model for bolted connections in wood." Canadian Journal of Civil Engineering 30, no. 3 (June 1, 2003): 555–67. http://dx.doi.org/10.1139/l03-009.
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Recent criticism of the bolted connection requirements in the Canadian wood design code CSA Standard O86 indicates that the code lacks consideration of the different modes of failure, particularly as they relate to multiple-bolt connections. A finite element model is proposed to predict loaddisplacement behaviour, stress distributions, ultimate strength, and mode of failure in single- and multiple-bolt connections. The three-dimensional (3-D) model uses anisotropic plasticity for the wood member and elastoplasticity for the bolt. The Weibull weakest link theory is used to predict failure at given levels of probability. Predictions for connection behaviour in Douglas-fir and laminated strand lumber (LSL) correspond to experimentally observed behaviour. The output from the 3-D model is used for a multiple-bolt connection spring model to illustrate many of the phenomena described in the literature.Key words: bolt, Douglas-fir, connection, model, plasticity, weakest link, wood.
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Fernández-Asián, Martínez-González, Torres-Lagares, Serrera-Figallo, and Gutiérrez-Pérez. "External Connection versus Internal Connection in Dental Implantology. A Mechanical in vitro Study." Metals 9, no. 10 (October 15, 2019): 1106. http://dx.doi.org/10.3390/met9101106.
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(1) Background: In today's dentistry, implantology has become a therapeutic resource of choice in certain clinical situations. The design of implants has evolved in several aspects since their inception. Dental implants were initially designed with an external hex connection, although due to force transmission and security in the adjustment of the prosthesis, later implants featured an internal hex connection. This study aims to analyse the mechanical properties of two types of implants (an internal connection and an external connection) from the same manufacturer and their different prosthetic components (union screw between implant and prosthetic abutment, and the abutment itself) when subjected to different types of load. (2) Materials and methods: Intraosseous dental implants of similar shape, design and size, although different in type of connection (external vs. internal), were studied. The specifications of the UNI EN ISO 14801 test standard were used, with all determinations being carried out three times. Finally, the dimensional characterisation of the samples analysed after the dynamic load study was carried out, and the values of both study groups were compared by means of the non-parametric Mann–Whitney U test to find statistically significant differences (p < 0.05). (3) Results: For the static characterisation test, we found between 610.9 N and 986.1 N for the external connection and between 1263.6 N and 1324 N for the internal connection (p = 0.011). All of the dynamic load tests were positive and there was no failure in any of the components studied. (4) Conclusions: After the analysis of the samples studied in vitro, satisfactory results were obtained, demonstrating that both connections can support considerable mechanical loads according to international standards (UNI EN ISO 14801).
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Disén, Kira, and Peggi L. Clouston. "BUILDING WITH BAMBOO: A REVIEW OF CULM CONNECTION TECHNOLOGY." Journal of Green Building 8, no. 4 (September 2013): 83–93. http://dx.doi.org/10.3992/jgb.8.4.83.
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Interest in the engineering performance of bamboo is on the rise primarily due to its rapid regenerative qualities and high strength-to-weight ratio. It has been a standard, sustainable building material for thousands of years in Asia and South America, where it grows naturally. Although there are many examples of magnificent bamboo structures, standards and documentation on safe and reliable bamboo design are scarce, particularly for connection design. Traditional connections involve friction-tight lashings (eg. ropes and cords of dried grasses) and pin-and-socket connections such as dowels and pegs, but more recent advances have involved integration with steel hardware and concrete. This paper presents bamboo as a feasible alternative building material and presents a review of past, current and emerging technologies to join hollow bamboo culms in structural applications. The paper's intent is to give an overview of the current state of bamboo connection technology and to promote developments in the emerging field of bamboo engineering. Recent technological advances and visionary architects have proven that it is possible to create safe structures that are not only sustainable but have tremendous potential for use in disaster relief and quick-build scenarios.
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Girard, C., A. Picard, and M. Fafard. "Finite element modelling of the shear lag effects in an HSS welded to a gusset plate." Canadian Journal of Civil Engineering 22, no. 4 (August 1, 1995): 651–59. http://dx.doi.org/10.1139/l95-077.
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The behavior of a typical connection at the ends of an HSS bracing member was investigated with the finite element method. The connection is effected by means of a gusset plate welded into slots in the HSS member. The paper presents the results of the finite element analyses of 25 connections which differed in the values assigned to the three main parameters that were considered. The finite element results are compared with the provisions of CSA Standard S16.1-M89, and some adjustments to these provisions are recommended. Key words: connections, steel, shear lag, finite element, hollow section, gusset.
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Franchuk, Cameron R., Robert G. Driver, and Gilbert Y. Grondin. "Experimental investigation of block shear failure in coped steel beams." Canadian Journal of Civil Engineering 30, no. 5 (October 1, 2003): 871–81. http://dx.doi.org/10.1139/l03-044.
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Relatively few tests have been conducted to determine the block shear capacity and behaviour of coped steel beam connections. Furthermore, design standards are inconsistent in the way they treat this failure mode and may predict capacities significantly higher than those determined experimentally. To address these issues, 17 full-scale tests were conducted on coped wide-flange beams. Parameters considered in the study include beam end rotation, end and edge distances, and bolt layout. Many of these parameters had not been systematically investigated prior to this research, and the effect of end rotation, i.e., the rotation at the connection due to flexural beam action, had not been examined. It is found that few of these parameters significantly affect the connection capacity, apart from the associated changes in net tension and gross shear areas. Following the laboratory tests, capacity design equations outlined in Canadian, American, European, and Japanese standards were examined. Tests-to-predicted ratios for each standard were calculated and compared. It was found that none of these standards accurately and consistently predict block shear capacity, especially when considering two-line connections.Key words: beams, block shear, bolts, connections, end rotation, rupture, shear, steel, tension, yield.
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Pan, Zhi Yong, Chun Feng, Hua Jia Zhang, Dong Feng Li, and Peng Yang. "Two Typical Cases Analysis of Casing Connection Pullout." Advanced Materials Research 524-527 (May 2012): 1651–55. http://dx.doi.org/10.4028/www.scientific.net/amr.524-527.1651.
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Research on a round thread casing connection pullout case and a buttress thread casing connection pullout accident was carried out combining relative theorys with tests. Macroscopic analysis and dimension measurement and material’s physical and chemical properties were checked for casings and couplings. Thread inspection and full-scale tests were done for casing simples that are same lot with pullout casing. Comprehensive analysis was carried out on these results. Two cases history showed that casing connection dropout may take place if make-up location cann’t reach standard location or make-up torque is too little even if the quality of casing and coupling are in accordance with corresponding standards.
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HUANG, Liang, and Maolin CAI. "PARALLEL CONNECTION MEASURING METHOD FOR GAS LEAKAGE BASED ON STANDARD FLOW." Proceedings of the JFPS International Symposium on Fluid Power 2008, no. 7-3 (2008): 705–8. http://dx.doi.org/10.5739/isfp.2008.705.
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Cantatore, Valentina, and Itai Panas. "Possible socket-plug standard connection for functionalized graphene – Validation by DFT." Carbon 104 (August 2016): 40–46. http://dx.doi.org/10.1016/j.carbon.2016.03.051.
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Lin, Yi-qing, Ju-fu Lu, and Wei-min G.U. "The connection of standard thin disk with advection-dominated accretion flow." Chinese Astronomy and Astrophysics 29, no. 2 (April 2005): 113–19. http://dx.doi.org/10.1016/j.chinastron.2005.04.001.
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Akhtar, Muhammad Maaz, Øyvind Karlsen, and Hirpa G. Lemu. "Study of Bondura® Expanding PIN System – Combined Axial and Radial Locking System." Strojniški vestnik – Journal of Mechanical Engineering 67, no. 12 (December 15, 2021): 625–34. http://dx.doi.org/10.5545/sv-jme.2021.7306.
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Bolted connections are widely used in parallel plates and flanged joints to axially lock using the preload generated by the tightening torque and to constrain radial movements of the flanges by the surface friction between mating surfaces. The surface friction depends on the micro-asperities of mating surfaces; under the influence of vibrations and other external radial loads, these asperities tend to deform over time, resulting in the failure of the connection. The Bondura expanding pin system presented in this article is an innovative axial and radial locking system, in which the failure of bolted connections due to radial movements is eliminated by relying on the mechanical strength of the pin system along with the surface friction. The present study describes an experimental design to verify the maximum possible preload on the axial-radial pin at different levels of applied torque. The article also provides a realistic comparison of the pin system with standard bolts in terms of handling axial and radial loads. With some alterations in the axial-radial pin system’s design, the joint’s capability to resist failure improved appreciably compared with the original design and standard bolts with higher preload. As a result, the estimated capability improvement of the joint against the connection failure due to the external radial load by the axial-radial pin is observed to be more than 200 % compared to standard bolts. Considering the pros and cons of both fasteners, i.e., axial-radial pin and standard bolts, a practical solution can be chosen in which both fasteners are used in a connection, and an optimized situation can be developed based on the working conditions.
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Magyar, András. "Standard Koszul self-injective special biserial algebras." Journal of Algebra and Its Applications 15, no. 03 (January 27, 2016): 1650044. http://dx.doi.org/10.1142/s0219498816500444.
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The aim of this paper is to establish a connection between the standard Koszul and the quasi-Koszul property in the class of self-injective special biserial algebras. Furthermore, we give a characterization of standard Koszul symmetric special biserial algebras in terms of quivers and relations.
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Mohammad, M., E. Karacabeyli, and J. H. P. Quenneville. "Lateral resistance of bolted wood-to-concrete connections loaded parallel or perpendicular to grain." Canadian Journal of Civil Engineering 30, no. 1 (February 1, 2003): 226–39. http://dx.doi.org/10.1139/l02-097.
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Tests were carried out to determine the lateral resistance of bolted lumber-to-concrete connections. Specimens were made of hemlockfir and sprucepinefir lumber and bolted to concrete blocks using anchor bolts. Three sizes of anchor bolts were used, with nominal diameters of 12.7 mm (1/2 in.), 15.8 mm (5/8 in.), and 19.1 mm (3/4 in.). The minimum strength of the connections loaded parallel to grain with a single bolt exceeds the characteristic strength specified in the 1994 edition of the Canadian Standards Association (CSA) standard O86.1 by a factor of 1.6 for 12.7 mm (1/2 in.) diameter bolts and 2.0 for 19.1 mm (3/4 in.) diameter bolts. Results on connections loaded perpendicular to grain showed that the 5th percentile strength of a connection with a single bolt was greater than the characteristic strength specified in the CSA standard by a factor of 1.42.5. The reasons for this underestimation of the strength values in the standard are attributed to a low estimate of the embedment strengths of wood and concrete, a low estimate of the yield strength of the bolts, and the lack of a design method that accounts for the axial tensioning effect. Changes to the CSA standard O86.1 provisions were proposed and have been accepted to improve the strength predictions of bolted wood-to-concrete connections. The 2001 edition of standard O86.1 reflects those changes.Key words: wood, anchor bolts, concrete, strength, parallel to grain, perpendicular-to-grain embedment, connections.
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Suhaimi, Hamizan, Saiful Izwan Suliman, Ismail Musirin, Afdallyna Fathiyah Harun, and Roslina Mohamad. "Network intrusion detection system by using genetic algorithm." Indonesian Journal of Electrical Engineering and Computer Science 16, no. 3 (December 1, 2019): 1593. http://dx.doi.org/10.11591/ijeecs.v16.i3.pp1593-1599.
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Developing a better intrusion detection systems (IDS) has attracted many researchers in the area of computer network for the past decades. In this paper, Genetic Algorithm (GA) is proposed as a tool that capable to identify harmful type of connections in a computer network. Different features of connection data such as duration and types of connection in network were analyzed to generate a set of classification rule. For this project, standard benchmark dataset known as KDD Cup 99 was investigated and utilized to study the effectiveness of the proposed method on this problem domain. The rules comprise of eight variables that were simulated during the training process to detect any malicious connection that can lead to a network intrusion. With good performance in detecting bad connections, this method can be applied in intrusion detection system to identify attack thus improving the security features of a computer network.
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Łapiński, Z., A. Dziedzic, W. Bochnowski, S. Adamiak, and S. Sandomierski. "The Quality of Welded Connections Elements from the Steel 30HGS and Titanium Alloy Ti6Al4V." Archives of Foundry Engineering 12, no. 2 (April 1, 2012): 159–66. http://dx.doi.org/10.2478/v10266-012-0056-3.
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The Quality of Welded Connections Elements from the Steel 30HGS and Titanium Alloy Ti6Al4V The aim of that work was the evaluation of the quality of welded connections elements (welds) from the 30HGS steel and titanium alloy Ti6Al4V. The metallographic, factographic tests were used, and measurements of microhardness with the Vickers method. In the head weld of the 30HGS steel there were non-metallic partial division and bubbles observed. The average microhardness in the head connection was 320 HV0.1. There was no significant increase/decrease observed of microhardness in the head influence zone of the weld. There was a good condition of head connections observed, in accordance with the standard EN12517 and EN25817. In the head weld of Ti6Al4V titanium alloy there were single, occasional non-metallic interjections and bubbles observed. There were no cracks both on the weld, and on the border of the heat influence zone. The value of microhardness in head connection was in the range 300÷445 HV0.1. Reveal a very good condition of the head connections in accordance with the standard EN12517 and EN25817. The factographic tests prove the correctness of welded connections done and then heat treatment in case of steel and titanium alloy.
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Bondarenko, Oleg, and Anatoliy Dziuba. "Sealing of Pipelines Flange Connections in Conditions of Fasteners Tightening Torque Reducing." Applied Mechanics and Materials 630 (September 2014): 283–87. http://dx.doi.org/10.4028/www.scientific.net/amm.630.283.
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Flanged connections are widely used in pipelines of various technical systems. Task of reducing the consumption of materials pipelines , ensuring their long-term tightness is highly relevant for shipbuilding , aviation and space technology and other mashinebuilding. In this paper, the task of deliberately reducing torque fasteners flange connection at build pipelines to ensure the initial tightness of the connection , reducing the weight of the pipeline , the alignment of the stress- strain state of the compound and determining the residual torque fasteners, providing connections for leaks. With decreasing torque fasteners ( intentional or natural ) will be sealed flanged if the remaining torque is sufficient to compensate for the pressure in the pipeline and prevent shear movement of the flange and gasket relative to each other . Found that the flange connection remains sealed with natural and deliberate reduction torque fasteners to 75-80 % compared to the initial .Sealing flange connections using technology and standard fastenings to reduce their weight by 10-50 %, and the replacement of flanges and pipe material - a whole lot of pipelines at 30-65 %.
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Nadya, Rahima Ummi Kulsum, and Fathoni Usman. "An Experimental Analysis on the Moment Rotation of Beam-Column Connection using Cold-form Steel Section." International Journal of Engineering & Technology 7, no. 4.35 (November 30, 2018): 668. http://dx.doi.org/10.14419/ijet.v7i4.35.23086.
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A beam-column connection of cold-formed steel section was arranged as an isolated joint. An experimental testing has been done on the model specimen until the model reached its failure mode. The behaviour of the cold-formed bolted connection in the matter of its strength and stiffness of the steel connection was studied. In this study, gusset-plate and bolted angle flange cleat connection were used in which it can stiffen the cold-formed beam-column connection. Moment-rotation curves were generated from the test results to represent the behaviour of the bolted connections. The design expression of the beam-column connection is following the design standard of Eurocode 3 BS EN 1993-1-8. The set-up of the experimental analysis, the procedure and the failure mode results are discussed in details. The moment capacity of 5.9 kN.m has been recorded for the beam section and 7.3 kN.m for the column section. The stiffness (Sj) was recorded as 120.94 kN.m/rad for the beam section and 182.42 kN.m/rad for the column section.
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Musbah, Musbah A., and Nasradeen A. Khalifa. "A MEDIATING EFFECT OF DONGLE AND BROADBAND ON THE RELATIONSHIP BETWEEN USERS FACTORS AND CONNECTION IN LIBYA." INTERNATIONAL JOURNAL OF COMPUTERS & TECHNOLOGY 15, no. 2 (December 7, 2015): 6534–40. http://dx.doi.org/10.24297/ijct.v15i2.6935.
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This is a positioning paper reflecting the problem and proposed the other name of Internet is technology. It is a Global system which is interconnected with computer networks all over the world. It also uses the standard of Internet protocol suit (TCP/IP) to make a linkup with millions of computer devices globally. Internet is a web of network which interconnects millions of private, public, academic, business, and government networks, of local to global scope, that are linked by a broad array of electronic, wireless, and optical networking technologies, the aim of this study is to examining the local field data for Dongle connection and Broadband connection in for selected site and to develop a statistical relationship users and connection at selected sites as well as to validate developed a model with respect to connection at selected sites. The Internet allows greater flexibility in working hours and location, especially with the spread of unmetered high-speed connections. Internet can be accessed in anywhere by any means or medium. Internet not only be used in big screen computers or laptops but also can be used in smart phones and tablets. There are many medium or source of internet connections, but in this advance technology there are two broad sources and they are either broadband connection or dongle connection.
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Meertens, Bruno, Patrick De Baets, Wim De Waele, and Jeroen Van Wittenberghe. "Fatigue behaviour of threaded couplings – experimental research." International Journal Sustainable Construction & Design 1, no. 1 (November 6, 2010): 50–57. http://dx.doi.org/10.21825/scad.v1i1.20395.
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In this article the fatigue behaviour of threaded connections is studied, as used in oil country tubular goods (OCTG). Some manufacturers have designed their own couplings (so called „premium connections‟) and they claim having an improved fatigue life or better sealability. This study will compare different coupling designs with the standard API connection. The methods used to compare the different designs are based on two-dimensional finite element analyses. Experimental research is conducted to validate the results of the FEA. The experimental research consists of a 4-point bending fatigue test, which will result in a SN-curve for the threaded connection. Based on numerical and experimental results a performance factor is deduced for the particular connection design. This factor will be used to find the best design of threaded couplings. As eventual goal of this study, with the insights gained, a threadedconnection with optimized fatigue life and sealability will be designed.
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Salmasi, Alireza, Mohammad Reza Sheidaii, Mohammad Saghaie Sahebalzaman, and Saeed Tariverdilo. "Effect of fully restrained beam-to-column connection on the progressive collapse strength of steel moment frames." Advances in Structural Engineering 23, no. 8 (January 20, 2020): 1656–68. http://dx.doi.org/10.1177/1369433219898072.
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The beam-to-column connection has been identified as a key element for steel frame structures to maintain the structural integrity during progressive collapse phenomenon. In the current study, in order to assess the effects of beam-to-column connection type on the progressive collapse strength of steel moment frames, the progressive collapse behavior of a steel intermediate moment frame structure was evaluated with 10 different types of fully restrained connections. The progressive collapse strength of these buildings against sudden removal of a column was separately studied using nonlinear static alternate path method presented in Unified Facility Criteria progressive collapse guideline. To consider the nonlinear effects in the structural modeling, plastic hinges for beam and column members and connections were defined and modeled according to the ASCE 41 standard. The results of the progressive collapse analyses indicated that if the plastic hinges of connections are separately defined in addition to the plastic hinges of beams and columns, the structure will have lower progressive collapse strength, and the calculated dynamic increase factor will grow. Among the studied types of connections, the free flange connection had the best performance and the highest strength against progressive collapse.
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Chernykh, A. G., and Quoc Phong Tran. "Analysis of the load bearing capacity of the connection with the use of self-drilling dowels in various models of elastic failure." Вестник гражданских инженеров 17, no. 4 (2020): 89–99. http://dx.doi.org/10.23968/1999-5571-2020-17-4-89-99.
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Currently, wooden structures characterized with high strength, low deformability and good aesthetics are being increasingly used in some areas of construction. Connections with multiple steel plates are very effective for wooden frames and trusses. In order to provide optimal connections, it is necessary to establish the relationship between the connection parameters and the load-bearing capacity of the structure. However, the technical regulations do not provide calculation methods specifically for this type of connection. There have been carried out a research and development of methods for calculating connections, an analysis of the self-drilling dowels` performance, and the factors affecting the load bearing capacity according to Eurocode 5 have been specified. The results obtained have been compared with other various research methods` results, there are offered authors` recommendations on the application of the standard in Russia.
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Zhang, Guo Yong, and Jiang Xing. "Computer Simulations of Chua’s Circuits with Small-World Connection." Advanced Materials Research 532-533 (June 2012): 1292–96. http://dx.doi.org/10.4028/www.scientific.net/amr.532-533.1292.
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Based on the two-dimensional array of Chua’s circuit, the complex dynamic phenomena of Chua’s circuits with small world connections was simulated. Such networks can be thought of as a model of nonlinear phenomena in spatially extended systems. And this means for understanding complex interactions existing in real systems where separate cells can communicate in various ways. In such small-world networks, the Chua’s circuit is taken as a standard chaotic cell. The results of computer simulation show that the spiral wave patterns could form in certain initial conditions in the presence of the small-world connection. In addition, it is found that the small-world connection could affect the pattern formation greatly.
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Shih, Jeffrey C., and Cyndi Giorgis. "Building the Mathematics and Literature Connection through Children's Responses." Teaching Children Mathematics 10, no. 6 (February 2004): 328–33. http://dx.doi.org/10.5951/tcm.10.6.0328.
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The Connections Standard in Principles and Standards for School Mathematics makes the significant observation that “the opportunity for students to experience mathematics in a context is important” (NCTM 2000, p. 66). Literature provides such a contextual base by embedding the meaning of the mathematics in situations to which children can relate. In this regard, the use of literature in the elementary mathematics curriculum has steadily increased over the past few years. The publication of books that specifically feature mathematics, as well as a deeper understanding by teachers of how to integrate literature and mathematics topics, has aided this increase. This article builds on the premise that educators want children to recognize and respond to the mathematics that may be evident or embedded in literature.