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EFFECT OF thE GRAIN SLIDING ON thE SEISMIC BEHAVIOR OF CIRCULAR SILOS: A thEORETICAL FORMULATION 8

EFFECT OF THE GRAIN SLIDING ON THE SEISMIC BEHAVIOR OF CIRCU...

引用

8th International Structural engineering and Construction conference on - Implementing Innovative Ideas in Structural engineering Project Management

作者： Pieraccini, Luca Silvestri, Stefano Gasparini, Giada Trombetti, Tomaso Univ Bologna DICAM Bologna Italy

ISBN: (纸本)9780996043717

Earthquakes frequently cause damage or collapse in silos, provoking significant financial loss and even loss of life. the effect of lateral seismic loads can damage the upper portion of the silo if the material contained can oscillate inside the silo during the ground motion. the contribution of the grain sliding in terms of wall stresses is not explicitly accounted neither in current design codes nor in scientific literature. In the present paper, the effect of the horizontal sliding of the grain layers is accounted in terms of additional overpressures, wall shear and bending moment during dynamic excitation and compared with theoretical formulations, code provisions and experimental evidence. Shaking table tests suggest that the grain sliding may be relevant in the evaluation of the wall base bending moment and that ACI 313-97 and Eurocode 8 provisions appear overly conservative. Finally, a design recommendation is drawn for reducing the effect of the seismic actions on the silo wall.

关键词： Effective mass Wall pressure Shaking table test Analytical developments

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the dynamic performance of the spindle in ultra-precision machine tools under different drive systems 8

The dynamic performance of the spindle in ultra-precision ma...

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8th Asia Pacific conference on Optics Manufacture, APCOM 2023 and 3rd International Forum of Young Scientists on Advanced optical Manufacturing, YSAOM 2023

作者： Wu, Hailiang Yang, Hui Lu, Chaowei Zhang, Yang Aviation Key Laboratory of Science and Technology on Precision Manufacturing Technology Beijing Precision Engineering Institute for Aircraft Industry Beijing100076 China

ISBN: (纸本)9781510672673

In order to analyze the influence of servo drives on the dynamic performance of multi-Axis coordinated ultra-precision machine tools, this study employs Simulink modeling and simulation of the control system for a domestic ultra-precision machine tool with gas-static spindle, followed by conducting position control experiments. the dynamic response of the spindle under different drives in ultra-precision machine tools is modeled based on the dynamic characteristic equation of the spindle motor. Waveforms of current, torque, and speed response of the spindle motor under different drives are simulated and analyzed. Control laws between the controlled object and the drive system are derived from the analysis of simulation data. Based on this, a dynamic performance testing platform for the spindle in ultra-precision machine tools is established, with the repeatability of positioning accuracy as the dynamic performance parameter. the linear correlation analysis between the experimental data of repeatability of positioning accuracy and the simulation results is conducted to quantitatively evaluate their correlation. Finally, it is determined that the gas-static spindle under the control of a linear amplifier exhibits the best dynamic performance. Moreover, as the PWM frequency increases under the control of PWM-Type drives at 100 kHz, 50 kHz, and 16 kHz, the dynamic performance of the spindle also improves. this study provides reference for the selection of drives in the design and selection stage of control systems for ultra-precision machine tools. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

关键词： Machine tools

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design of a real-time pyrosequencer by bioluminometric assay coupled with photodiode array

Design of a real-time pyrosequencer by bioluminometric assay...

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8th International conference on Photonics and Imaging in Biology and Medicine, PIBM 2009

作者： Chen, Haifeng Liang, Chao Li, Chuanjun Li, Cheng Ge, Jianhui Zhang, Yuming Zhou, Guohua Huadong Research Institute for Medicine and Biotechnics Nanjing 210002 China State Key Laboratory of Integrated Optoelectronics Institute of Semiconductors Chinese Academy of Science Beijing 100083 China

ISBN: (纸本)9780819479082

Objective: A system for real-time pyrosequencing by biolumino-metric assay coupled with a photodiode array is presented. the approach is based on the detection of DNA polymerase activity by an enzymatic luminometric inorganic pyrophosphate (PPi) detection assay. It is designed to offer a convenient pyrosequencing-based platform for DNA sequencing with low cost and simple structure. Method: Together with the automated dNTPs micro-dispensers, a photoelectric conversion circuit with high sensitive photodiode S1133-01 and ultra-low bias current monolithic operational amplifier OPA129 is chosen to detect the luminometric, monitoring the ATP production continuously. the signal to noise ratio is improved efficiently by routing PCB and shielding carefully. Results: A C14 standard light source is selected to compare the sensitivity of the system to the photomultiplier tubes (PMT). the results show that the magnification of the circuits is ten times higher than the PMT, which is sufficient for detecting the DNAs as small as 10 fmol. Four different type of dNTPs are injected into the reaction cell in turn and the peak of luminescence illuminates the result, which is coinciding with the commercial system. Conclusion: the system is small, simple and inexpensive, which is enough for real-time pyrosequencing. But there are many works to do to construct the fast and high-flux DNA sequencing system. © 2009 Copyright SPIE - the International Society for optical engineering.

关键词： Photomultipliers

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Simulation Analysis of thunderstorm Activity Law of Wind Farm Station Based on Cumulative Probability Fitting of Lightning current Amplitude 8

Simulation Analysis of Thunderstorm Activity Law of Wind Far...

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8th International conference on Energy System, Electricity, and Power, ESEP 2023

作者： Zhang, Mingxu Zhang, Xiaodong Qi, Nan Chen, Ge Mengdong Concord New Energy Co. Ltd. Inner Mongolia Autonomous Region Tongliao City028000 China

ISBN: (数字)9781510679801

ISBN: (纸本)9781510679795

Using Maxwell 3D to simulate the measured values of wind farms is susceptible to distortion, resulting in mismatches between the analyzed thunderstorm field strengths of different main towers and the actual thunderstorm field strengths. therefore, it is necessary to design a new simulation and analysis method for thunderstorm activity patterns in wind farms. that is, to correct the thunderstorm data of the atmospheric electric field instrument, combined with the fitting of lightning current amplitude and lightning probability, to establish a simulation model for the thunderstorm activity law of the wind farm, and complete the simulation analysis of the thunderstorm activity law of the wind farm station. the example analysis results show that the thunderstorm electric field strength of different main towers analyzed is in good agreement with the actual thunderstorm electric field strength, which has good analysis results, reliability, and certain application value. It has made a certain contribution to reducing the thunderstorm risk of wind farm stations. © 2024 SPIE.

关键词： thunderstorms

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design improvement of a buffered SOA-based ultrafast all-optical half adder with PolSK modulated signals

Design improvement of a buffered SOA-based ultrafast all-opt...

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International Symposium on High Capacity optical Networks and Enabling Technologies, HONET

作者： Hamed Ahmadi Hassan Kaatuzian Photonics Research Laboratory Electrical Engineering Department Amirkabir University of Technology Tehran Iran

In this paper, we analyze and improve a modern structure optical design for an ultrafast all-optical half adder. this design is based on four wave mixing (FWM) in a semiconductor optical amplifier (SOA), with polarization-shift-keying (PolSK) modulation input signals. For analyzing the amplifier we use a finite-difference method based on solution of the traveling wave equations. In this study, we have shown that the output signal power of the device increases with the length of the SOA section and current injection.

关键词： optical amplifiers Stimulated emission optical fiber networks ISO standards optical polarization

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Topology information based spare capacity provisioning in WDM networks

引用

8th International conference on Grid and Pervasive Computing, GPC 2013

作者： Hwang, Hoyoung Kim, Seung-Cheon Dept. of Multimedia Engineering Hansung University Korea Republic of Dept. of Information Communication Engineeging Hansung University Korea Republic of

ISBN: (纸本)9783642380266

For networksurvivability, recovery methods from link or node failures should be provided and spare capacity to perform recovery should be prepared on the network links. the efficiency of spare capacity provisioning is a key issue in survivable network design. In this paper, we studied topology information based capacity provisioning methods for WDM optical networks which are widly used as a backbone architecture of current *** the methods, the spare wavelengths are reserved to perform optical link protection using only topology information of a network without need to calculate the amount of on-going traffic of the network, thus provide simple and efficient spapre capacity planning. the basic idea of the topology information based methods is embedding virtual cycles to perform recovery on the network topology *** suggest a multiple ring-cover based spare capacity provisioning scheme and compare it with two other topology information based schemes called cyclic-double-cover and p-cycle. We provide performance analysis of the topology information based schemes by the numerical calculation using cut-sets of the topology graphs, and compare it with computer simulation results. © 2013 Springer-Verlag.

关键词： Recovery

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Loss Calculation and Fluid-thermal Field Coupled Analysis of Bridge Arm Reactor 8

Loss Calculation and Fluid-Thermal Field Coupled Analysis of...

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8th International conference on Energy System, Electricity, and Power, ESEP 2023

作者： Wang, Liuyang Yang, Fan Tang, Pengfei Zhao, Qi Wang, Pengbo Li, Xinheng State Key Laboratory of Power Transmission Equipment Technology School of Electrical Engineering Chongqing University 400044 China China Electric Power Research Institute Beijing100192 China Tianjin Key Laboratory of Internet of Things in Electricity State Grid Tianjin Electric Power Research Institute Tianjin300384 China

ISBN: (数字)9781510679801

ISBN: (纸本)9781510679795

Bridge arm reactors are subjected to composite current of AC and DC in operation, having both AC current distribution characteristics based on inductance distribution and DC current distribution characteristics based on resistance distribution. Aiming to study the differences in temperature rise, current and loss calculations are performed according to electromagnetism and heat transfer theories. the static temperature distribution law of the reactor and its influencing factors are analyzed. the results show that the loss of metal accessories accounts for 1.02% and the collector ring is prone to local overheating. the maximum temperature rise of the encapsulation shows a nonlinear decrease with the increase of the flow rate and the decrease of the ambient temperature. the winding hottest spot temperature in AC condition is higher than that in DC condition. the temperature distribution is more uniform in DC condition. the research results can provide reference for the design of temperature rise of reactors under AC-DC compound high current in actual engineering. © 2024 SPIE.

关键词： Temperature distribution

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Conceptual design of the MOBIE Imaging Spectrograph for TMT 5

Conceptual Design of the MOBIE Imaging Spectrograph for TMT

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5th conference on Ground-Based and Airborne Instrumentation for Astronomy

作者： Bigelow, Bruce C. Radovan, Matthew V. Bernstein, Rebecca A. Onaka, Peter M. Yamada, Hubert Isani, Sidik Miyazaki, Satoshi Ozaki, Shinobu GMTO Corp Pasadena CA 91101 USA Univ Calif Observ Santa Cruz CA 95064 USA Univ Hawaii Inst Astron Honolulu HI 96822 USA Natl Astron Observ Japan Mitaka Tokyo 1818588 Japan

ISBN: (纸本)9780819496157

the Multi-Object Broadband Imaging Echellette (MOBIE) is the seeing-limited, visible-wavelength imaging multi-object spectrograph (MOS) planned for first-light use on the thirty Meter Telescope (TMT). the MOBIE project to date has been a collaboration lead by UC Observatories (CA), and including the UH Institute for Astronomy (HI), and the NAOJ (Tokyo, Japan). the current MOBIE optical design provides two color channels, spanning the 310-550nm and 550-1000nm passbands, and a combination of reflection gratings, prisms, and mirrors to enable direct imaging and three spectroscopic modes with resolutions (lambda/Delta lambda) of roughly 1000, 3000, and 8000 in both color channels, across a field of view that ranges from roughly 8x3 arcmin to 3x3 arcmin, depending on resolution mode. the conceptual design phase for the MOBIE instrument has been underway since 2008 and is expected to end in 2015. We report here on developments since 2010, including assembly of the current project team, instrument and camera optical designs, instrument control systems, atmospheric dispersion corrector, slit-mask exchange systems, collimator, dichroic and fold optics, dispersing and cross-dispersing optics, refracting cameras, shutters, filter exchange systems, science detector systems, and instrument structures.

关键词： TMT MOBIE WFOS MOS spectrograph (up to 8 keywords allowed)

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Application of Fuzzy PI Algorithm in Voltage-mode Pulse Width Modulation Rectifier 8

Application of Fuzzy PI Algorithm in Voltage-mode Pulse Widt...

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8th International conference on Electromechanical Control Technology and Transportation, ICECTT 2023

作者： Cui, Yunlong Gan, Dengcheng School of Electronic and Information Engineering Chongqing Three Gorges University Chongqing China School of Electronic and Information Engineering Yangtze Normal University Chongqing China

ISBN: (纸本)9781510668331

It is difficult to realize the three-phase voltage PWM rectifier with the traditional PI control strategy, and with the increasing requirements for the performance of the rectifier, the traditional PI control in performance has been difficult to achieve the desired effect, so this paper proposes a new double closed-loop control strategy. the original voltage outer loop PI control is changed to fuzzy PI control while the inner loop current control still uses feedforward decoupling control strategy. Compared with the traditional PI control method, the proposed method not only realizes the self-tuning of PI parameters, but also makes the system have better response performance, higher stability and robustness. Matlab/Simulink toolbox is used to build a rectifier simulation model based on fuzzy PI control, and then the design method is verified by simulation experiments. © 2023 SPIE.

关键词： Electric rectifiers

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On the characterization of materials and masonry walls of historical buildings: Use of optical system to obtain displacement maps in double-flat jack tests 8th

On the characterization of materials and masonry walls of hi...

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8th International conference on Structural engineering, Mechanics and Computation (SEMC)

作者： Acito, M. Magrinelli, E. Tiraboschi, C. Cucchi, M. Politecn Milan Dept Architecture Built Environm & Construct Engn Milan Italy Politecn Milan Mat Testing Lab Milan Italy

ISBN: (纸本)9781003348450;9781032391144

Among the testing techniques aiming at the mechanical characterization of masonry, the double flat-jack testing method is widely adopted to identify the local value of significant parameters needed to perform structural analyses, such as elastic modulus, Poisson's ratio and compressive strength. the experience gained from many applications has allowed not only to collect experimental data concerning different types of masonry, but also to highlight the difficulty in the interpretation of the results and the limitations of both single and double flat-jack tests. Although the accuracy of the flat-jack technique in detecting strength and deformability behavior of masonry is still debated in the technical literature and practical activities, changes in the testing procedure aiming at ascertaining the validity of the test results have not been formally defined yet. After a brief description of the standard test procedure and its uncertainties, the present paper proposes an upgrade of the test procedure for improving the level of reliability of the test results. In particular, an experimental case study related to a historical brick masonry building located in Italy is presented to point out the additional information necessary to validate the results of the testing process.

关键词： Compressive strength

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