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Novel Methodologies for Preventing Crack Propagation in Steel Gas Pipelines Considering the Temperature Effect

Structural Durability & Health Monitoring 2025年第1期19卷 1-23页

作者： Nurlan Zhangabay Ulzhan Ibraimova Marco Bonopera Ulanbator Suleimenov Konstantin Avramov Maryna Chernobryvko Aigerim Yessengali department of Architecture and Urban Planning Mukhtar Auezov South Kazakhstan UniversityShymkent160012Kazakhstan department of Industrial Civil and Road Construction Mukhtar Auezov South Kazakhstan UniversityShymkent160012Kazakhstan Mechanics Sound&Vibration LaboratoryDepartment of Civil EngineeringCollege of EngineeringNational Taiwan UniversityTaipei10617Taiwan department of Reability&Dynamic Strength A.Pidhornyi Institute of Mechanical Engineering Problems of National Academy of Sciences of UkraineKharkiv61046Ukraine

Using the software ANSYS-19.2/Explicit Dynamics,this study performedﬁnite-element modeling of the large-diameter steel pipeline cross-section for the Beineu-Bozoy-Shymkent gas pipeline with a non-through straight crack,strengthened by steel wire *** effects of the thread tensile force of the steel winding in the form of single rings at the crack edges and the wires with different winding diameters and pitches were also *** results showed that the strengthening was preferably executed at a minimum value of the thread tensile force,which was 6.4%more effective than that at its maximum *** analysis of the inﬂuence of the winding dia-meters showed that the equivalent stresses increased by 32%from the beginning of the crack growth until the wire *** increment in winding diameter decelerated the disclosure of the edge crack and reduced its length by 8.2%.The analysis of the inﬂuence of the winding pitch showed that decreasing the distance between the winding turns also led to a 33.6%reduction in the length of the straight crack and a 7.9%reduction in the maximum stres-ses on the strengthened pipeline *** analysis of the temperature effect on the pipeline material,within a range from-40℃ to+50℃,resulted in a crack length change of up to 5.8%.As the temperature dropped,the crack length *** such a temperature range,the maximum stresses were observed along the cen-tral area of the crack,which were equal to 413 MPa at+50℃ and 440 MPa at-40℃.The results also showed that the presence of the steel winding in the pipeline signiﬁcantly reduced the length of crack propagation up to 8.4 times,depending on the temperature effect and design parameters of *** work integrated the existing methods for crack localization along steel gas pipelines.

关键词： Crack propagation ﬁnite-element internal pressure prestressing steel gas pipeline temperature effect

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Anthropomorphic Design of the Human-Like Walking Robot

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Journal of Bionic engineering 2013年第2期10卷 186-193页

作者： Ming-Hsun Chiang Fan-Ren Chang department of Electric engineering National Taiwan University Taipei City Taiwan 10617

In this paper, we present a new concept of the mechanical design of a humanoid robot. The goal is to build a humanoid robot utilizing a new structure which is more suitable for human-like walking with the characteristics of the knee stretch, heel-contact, and toe-off. Inspired by human skeleton, we made an anthropomorphic pelvis for the humanoid robot. In comparison with con- ventional humanoid robots, with such the anthropomorphic pelvis, our robot is capable of adjusting the center of gravity of the upper body by the motion of pelvic tilt, thus reducing the required torque at the ankle joint and the velocity variations in hu- man-like walking. With more precise analysis of the foot mechanism, the fixed-length inverted pendulum can be used to describe the dynamics of biped walking, thus preventing redundant works and power consumption in length variable inverted pendulum system. As the result of the new structure we propose, a humanoid robot is able to walk with human-like gait.

关键词： humanoid robot anthropomorphic robot mechanical design human-like walking heel-contact motion toe-off motion

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Decomposition of formaldehyde by EPD photocatalyst filters in HVAC

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Particuology 2011年第5期9卷 497-501页

作者： Chien-Chih Chen Ching-Song Jwo Tun-Ping Teng Graduate Institute of Mechanical and electrical engineering National Taipei University of Technology Taipei. Taiwan China department of Energy and Refrigerating Air Conditioning engineering. national taipei university of Technology Taipei Taiwan China department of Industrial Education. national taiwan Normal university Taipei Taiwan China

This study used electrophoretic deposition （EPD） to apply titanium oxide （TiO2） coating on stainless steel filters and investigated the effectiveness of photocatalytic oxidation of formaldehyde by TiO2 under various conditions of heating ventilation air conditioning （HVAC）. The results showed photocatalytic efficiency could reach 35,59% at 21 ℃ and 36.39% at 26℃ with 7 photocatalyst filters and 5 UVC lamps, the overall efficiency of formaldehyde removal of 52.37% at 21 ℃, and 56.8% at 26 ℃, By all experimental data can be found that the temperature for the photocatalytic performance is not obvious in the range of this study.

关键词： Electrophoretic deposition (EPD) TiO2 Filter HVAC

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Reference Selection for Offline Hybrid Siamese Signature Verification Systems

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Computers, Materials & Continua 2022年第10期73卷 935-952页

作者： Tsung-Yu Lu Mu-En Wu Er-Hao Chen Yeong-Luh Ueng department of electrical engineering National Tsing Hua UniversityHsinchuTaiwan department of Information and Finance Management National Taipei University of TechnologyTaipeiTaiwan department of Communications engineering National Tsing Hua UniversityHsinchuTaiwan department of electrical engineering and the Institute of Communications engineering National Tsing Hua UniversityHsinchuTaiwan

This paper presents an off-line handwritten signature verification system based on the Siamese network,where a hybrid architecture is *** Residual neural Network(ResNet)is used to realize a powerful feature extraction model such that Writer Independent(WI)features can be effectively learned.A single-layer Siamese Neural Network(NN)is used to realize a Writer Dependent(WD)classifier such that the storage space can be *** the purpose of reducing the impact of the high intraclass variability of the signature and ensuring that the Siamese network can learn more effectively,we propose a method of selecting a reference signature as one of the inputs for the Siamese *** take full advantage of the reference signature,we modify the conventional contrastive loss function to enhance the *** using the proposed techniques,the accuracy of the system can be increased by 5.9%.Based on the GPDS signature dataset,the proposed system is able to achieve an accuracy of 94.61%which is better than the accuracy achieved by the current state-of-the-art work.

关键词： Siamese network offline signature verification residual neural network reference selection

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Theoretical insights on alleviating lattice-oxygen evolution by sulfur substitution in Li_(1.2)Ni_(0.6)Mn_(0.2)O_(2) cathode material

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npj Computational Materials 2022年第1期8卷 2027-2036页

作者： Kuan-Yu Lin Santhanamoorthi Nachimuthu Han-Wen Huang Jyh-Chiang Jiang department of Chemical engineering National Taiwan University of Science and TechnologyTaipeiTaiwanChina

Here,we demonstrate that the lattice oxygen release on the high-capacity cathode,Li_(1.2)Ni_(0.6)Mn_(0.2)O_(2)(LNMO)surface can be successfully suppressed through S-anion-substitution using density functional theory(DFT)calculations and ab initio molecular dynamics(AIMD)*** oxygen evolution mechanisms on pristine and sulfur(S)-substituted LNMO(003)surfaces in the presence of an electrolyte mixture are ***-oxidation of O^(2−)anions during delithiation in the pristine surface results in oxygen evolution and subsequent structural ***,in the S-substituted LNMO,S^(2−)anions primarily participate in charge compensation and further inhibit oxygen evolution and O vacancy formation at high degrees of ***,the S-substitution effectively prevents the formation of Ni^(3+)ions and Jahn-Teller distortion,retaining the layered structure during *** findings provide insight into improving the structural stability of the LNMO(003)surface,paving the way for developing Li-rich LNMO cathode materials for next-generation LIBs.

关键词： substitution sulfur insight

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Turning in a Bipedal Robot

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Journal of Bionic engineering 2013年第3期10卷 292-304页

作者： Jau-Ching Lu Jing-Yi Chen Pei-Chun Lin department of Mechanical engineering National Taiwan University Taipei 106 Taiwan

We report the development of turning behavior on a child-size bipedal robot that addresses two common scenarios： turning in place and simultaneous walking and turning. About turning in place, three strategies are investigated and compared, including body-first, leg-first, and body/leg-simultaneous, These three strategies are used for three actions, respectively： when walking follows turning immediately, when space behind the robot is very tight, and when a large turning angle is desired. Concerning simultaneous walking and turning, the linear inverted pendulum is used as the motion model in the single-leg support phase, and the polynomial-based trajectory is used as the motion model in the double-leg support phase and for smooth motion connectivity to motions in a priori and a posteriori single-leg support phases. Compared to the trajectory generation of ordinary walking, that of simultaneous walking and turning introduces only two extra parameters： one for determining new heading direction and the other for smoothing the Center of Mass （COM） trajectory. The trajectory design methodology is validated in both simulation and experimental environments, and successful robot behavior confirms the effectiveness of the strategy.

关键词： turning biped humanoid trajectory planning robot

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Effects of Deformation Rate on the Unbinding Pathway of the MMP8-Aggrecan_IGD Complex in Cartilage

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Computer Modeling in engineering & Sciences 2019年第8期120卷 305-318页

作者： Deng Li Shuwei Chang department of Civil engineering National Taiwan UniversityTaipei 10617Taiwan

Mechanical force plays a critical role in the remodeling and degradation of cartilage *** cartilage tissue generates,absorbs,and transmits mechanical force,enabling specific biological processes in our body.A moderate intensity mechanical force is necessary for cartilage tissue remodeling and the adaptation of biomechanical properties,but a high intensity mechanical force can lead to pathological degradation of cartilage ***,the molecular mechanism of cartilage degradation is still *** use full atomistic simulations with SMD simulations to investigate whether the magnitude of mechanical force affects the unbinding pathway of the MMP8-Aggrecan_IGD *** find that when the pulling velocity is slow,the mechanical force required to unbind the Aggrecan_IGD from MMP8 is higher,and a three-step unbinding pathway is *** the other hand,when the pulling velocity is fast,the mechanical force required to unbind the Aggrecan_IGD from MMP8 is lower,and a two-step unbinding pathway is *** results help us to understand how the magnitude of the mechanical force affects the unbinding pathway of the enzyme-ligand complex in cartilage tissue at the molecular level.

关键词： Mechanical force steered molecular dynamics(SMD) unbinding pathway potential of mean force(PMF)

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A Bio-Inspired Hopping Kangaroo Robot with an Active Tail

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Journal of Bionic engineering 2014年第4期11卷 541-555页

作者： Guan-Horng Liu Hou-Yi Lin Huai-Yu Lin Shao-Tuan Chen Pei-Chun Lin department of Mechanical engineering National Taiwan University Taipei 106 Taiwan

Inspired by kangaroo＇s locomotion, we report on developing a kangaroo-style hopping robot. Unlike bipeds, quadrupeds, or hexapods which altemate the legs for forward locomotion, the kangaroo uses both legs synchronously and generates the forward locomotion by continuous hopping behavior, and the tail actively balances the unwanted angular momentum generated by the leg motion. In this work, we generate the Center of Mass （CoM） locomotion of the robot based on the reduced-order Rolling Spring Loaded Inverted Pendulum （R-SLIP） model, for matching the dynamic behavior of the empirical robot legs. In order to compensate the possible body pitch variation, the robot is equipped with an active tail for pitch variation compensation, emulating the balance mechanism of a kangaroo. The robot is empirically built, and various design issues and strategies are addressed. Finally, the experimental evaluation is executed to validate the performance of the kangaroo-style robot with hopping locomotion.

关键词： legged robot kangaroo hopping SLIP tail

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A Sensor Network Web Platform Based on WoT Technology

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Computer Systems Science & engineering 2021年第8期38卷 197-214页

作者： Shun-Yuan Wang Yun-Jung Hsu Sung-Jung Hsiao Wen-Tsai Sung department of electrical engineering National Taipei University of TechnologyTaipei10608TaiwanChina department of Information Technology Takming University of Science and TechnologyTaipei11451TaiwanChina department of electrical engineering National Chin-Yi University of TechnologyTaichung41170TaiwanChina

This study proposes a Web platform,the Web of Things(WoT),whose Internet of Things(IoT)architecture is used to develop the technology behind a new standard Web *** a remote sensor passes data to a microcontroller for processing,the protocol is often not *** study proposes a WoT platform that enables the use of a browser in a mobile device to control a remote hardware *** optimized code is written using an artificial intelligencebased algorithm in a *** data convergence technology is adopted to process the packets of different protocols and place them on the Web platform for access by other mobile *** platform has high efficiency and cross-platform advantages,with no limitation on the operating *** queueing telemetry transport(MQTT)technology is used to simplify the original HTTP *** that the mobile device is a subscriber,i.e.,the controller,and a microcontroller that connects the sensing device is the *** publishers and subscribers of MQTT need not know each other if they share a message *** intermediate agent role is much like a *** and subscribers do not need to interact,and publishers do not have to wait for subscriber confirmation to cause interactive permission be *** must publishers and subscribers be online at the same time,and they are free to choose when to get *** proposed WoT method is compared with the traditional IoT method regarding data *** results show that the proposed method can save time in processing large amounts of data,as the traditional IoT method wastes time,especially in data format transfer.

关键词： Embedded systems mobile Web servers big data analysis WoT IoT

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Enhanced electroluminescence from nanocrystallite Si based MOSLED by interfacial Si nanopyramids

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Chinese Optics Letters 2007年第11期5卷 671-673页

作者：林恭如 Graduate Institute of Photonics and Optoelectronics department of electrical engineering National Taiwan UniversityTaipei 106

The interracial Si nano-pyralnid-enhanced electroluminescence （EL） of an ITO/SiOx/p-Si/Al metal-oxidesemiconductor （MOS） diode with turn-on voltage of 50 V, threshold current of 1.23 mA/cm^2, output power of 16 nW... 详细信息

关键词： Electric potential Electroluminescence MOS devices Nanocrystallites Semiconducting silicon

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