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Study on rock breaking efficiency of special shaped cutters

IOP Conference Series: Earth and Environmental Science 2022年第1期983卷

作者： Qi Peng Yingcao Zhou Jiaqing Yu Xiongwen Yang Yu Liu Chi Ma Chris Cheng Xiaohua Ke CNPC Engineering Technology R & D Company Limited Beijing China Research Institute of Petroleum Exploration & Development Beijing China CNPC USA Corporation (Houston TX USA)

The optimization of cutter shape has become one of the main innovation direction of PdC bit technology. At present, both domestic and foreign bit manufacturers have put forward various special shaped cutters to improve rock breaking efficiency. However, there are relatively few researches which focus on the rock breaking efficiency of special-shaped cutters. Therefore, three kinds of typical cutters (flat cutter, convex cutter and concave cutter) are selected as the study object in this paper. Based on the single cutter test, the relationship of axial cutting force, cutting area and cutting specific energy under different working conditions will be provided. The experimental results show that the axial cutting force and specific energy of concave cutter and convex cutter are lower than that of flat cutter in most test cases. The results are almost the same for both Vosges sandstone and Marcellus shale cases. In other words, the tested concave cutters are easier to intrude into rock and obtain higher rock brea king efficiency under the same cutting conditions, when compared with flat cutter and convex cutter. The experimental method provides a technica l reference for studying the rock breaking efficiency of three-dimensional cutters with different shapes.

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Energy Management Scheme for Electric Vehicles with rapid-charging Facility Utilizing Grid Power Storage Packs and Photovoltaic Generator

Energy Management Scheme for Electric Vehicles with Rapid-ch...

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IEEE International Conference on Automatic Control and Intelligent Systems (I2CACIS)

作者： Zeeshan Ahmad Arfeen Usman Ullah Sheikh Saifulnizam A. Khalid Muhammad Salman Saeed Farrukh Hafeez Muhammad Faisal Hafiz Bilal Ahmed School of Electrical Engineering The Islamia University of Bahawalpur Bahawalpur Pakistan School of Electrical Engineering Universiti Teknologi Malaysia Johor Bahru Johor Malaysia School of Electrical Engineering Multan Electric Power Company Multan Pakistan Electrical Engineering department Universiti Teknologi Malaysia Jubail Saudia Arabia School of Computing University of Sargodha Sargodha Pakistan R&D Engineer PPK Technology SDN Melaka Malaysia

ISBN: (数字)9781728161334

ISBN: (纸本)9781728161341

To lessen the burden on the mainstream, the simplest means is to use an extreme mix of renewable resources. A grid-interactive electric-driven vehicle fast-charging area boosted by the solar power network and a couple of lithium chargeable batteries as a dynamic stationary energy storage powerhouse is valued and understudied. The scheme management is backed by pretending the fast station under variant irradiance scenarios taking consideration of the price of the power traveling waves and the battery state of health. The feasibility of deploying local stationary storage with the ultra-power charger to make it less dependent on the grid is demonstrated in the defined scenarios. The execution of the energy management strategy is carried by employing a rule-based energy management controller with the efficient algorithm scheme applies to an advanced fast car charging deck. It reveals that the process works well and has a power efficient control of the car refueling deck under study. Indeed, this project is of the best concern for reviewing and assessing several configuration and control networks of fast charging through the application of paradigms with Matlab/Simulink simulations.

关键词： Batteries Microgrids Buffer storage Photovoltaic systems Voltage control

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Broadband Low-loss Fan-in/Fan-out devices for Multicore Fibers

Broadband Low-loss Fan-in/Fan-out Devices for Multicore Fibe...

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Asia Communications and Photonics Conference

作者： Yifan Kang Xiancong Guo Lin Gan Li Shen Chen Yang rui Zhang Lei Shen Weijun Tong Songnian Fu Ming Tang deming Liu Wuhan National Laboratory for Optoelectronics (WNLO) & Next Generation Internet Access National Engineering Lab (NGIA) School of Optical and Electronic Information Huazhong University of Science and Technology Wuhan China State Key Laboratory of Optical Fiber and Cable Manufacture Technology Yangtze Optical Fiber and Cable Joint Stock Limited Company (YOFC). R&D Center

We proposed and achieved broadband fused-taper type fan-in/fan-out devices for multicore fibers with -65 dB crosstalk at 1550 nm. The average insertion losses of Fi/Fo pair from O-band to L-band are all under 1.2 dB.

ISBN: (纸本)9781943580705

关键词： Fiber bundles Multicore fibers refractive index Single mode fibers Space division multiplexing Tapered fibers

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design of a robust SSSC supplementary controller to suppress the SSr in the series-compensated system

Design of a robust SSSC supplementary controller to suppress...

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IEEE Winter Meeting Power engineering Society

作者： Jang-Cheol Seo Seung-Il Moon Jong-Keun Park Jong-Woong Choe Electro technology R&D Center LG Industrial Systems Co. Ltd Cheong Ju Korea Electrotechnology Research & Development Center LG Industrial Systems Company Limited Cheongju South Korea School of Electrical Engineering Seoul National University Seoul Korea School of Electrical Engineering Seoul National University Seoul South Korea

ISBN: (纸本)0780366727

This paper presents the design of an H/sub /spl infin// based robust static synchronous series compensator (SSSC) supplementary controller to suppress the subsynchronous resonance (SSr) in the series-compensated system. The modified IEEE second benchmark, System-1 model is employed for this study. In order to design the effective controller, the modal observability to the oscillation modes is considered. Comprehensive time domain simulation studies using the nonlinear system model show that the proposed H/sub /spl infin// SSSC supplementary controller can suppress the SSr efficiently in spite of the variations of power system operating conditions.

关键词： robust control Control systems Power system modeling Power system simulation Power transmission lines resonance Observability Shafts Nonlinear systems Nonlinear control systems

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An Experimental Study on optimizing the particle size distribution of bridging agents in drilling fluids

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IOP Conference Series: Earth and Environmental Science 2021年第1期631卷

作者： Cheng Hui Chengyun Ma deliang Tian Chao Luo Lingzhan Zou Haige Wang CNPC Engineering Technology R&D Company Limited Beijing 102206 China College of Petroleum Engineering China University of Petroleum Beijing 102249 China State Key Laboratory of Petroleum Resources and Engineering Beijing 102249 China

Managing lost circulation has always been a serious challenge in the oil industry. This situation becomes further complicated when shale formation is involved. Particulate lost circulation materials (LCMs) have been used to prevent the drilling fluid from entering fractured, cavernous, or high-permeability formations for many years. However, existing LCMs are inefficient in terms of size and application methods in solving severe-to-total losses in shales due to the uncertainty of particle size distribution (PSd) in drilling fluids. This study focuses on an experimental method optimizing the PSd of solid particles in the drilling fluid at high temperature and pressure. An orthogonal experiment of L9 (3)4, including four factors and three levels, was designed to investigate the relationship between the PSd of solid particles and filtration loss. results indicate that the orthogonal design method contributes to the optimization of the PSd of solid particles in the drilling fluid and reduce the test time and experimental workload during the drilling fluid process in the design stage. In addition, a polynomial relationship between the cumulative filtration loss and d90 or d50 is verified experimentally in this study. This study will remarkably benefit the drilling technologists in resolving the issue of lost circulation.

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Phase-change chalcogenide nonvolatile rAM completely based on CMOS technology

Phase-change chalcogenide nonvolatile RAM completely based o...

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International Symposium on VLSI technology, Systems and Applications

作者： Y.N. Hwang J.S. Hong S.H. Lee S.J. Ahn G.T. Jeong G.H. Koh H.J. Kim W.C. Jeong S.Y. Lee J.H. Park K.C. ryoo H. Horii Y.H. Ha J.H. Yi W.Y. Cho Y.T. Kim K.H. Lee S.H. Joo S.O. Park U.I. Jeong H.S. Jeong Kinam Kim Advanced Technology Development Semiconductor R&D Division Samsung Electronics Company Limited Yongin si Kyunggi South Korea Process Development Samsung Electronics Company Limited Yongin si Kyunggi South Korea Process Development Samsung Electronics Co. Ltd Yongin Korea Computer Aided Engineering Teams Samsung Electronics Co. Ltd Yongin Korea

ISBN: (纸本)0780377656

We have integrated a phase-change chalcogenide random access memory, completely based on 0.24 /spl mu/m-CMOS technologies. A twin cell and BL clamping circuits are introduced to enlarge fabrication tolerance and to reduce cell perturbation during reading operation. To draw back current as much as possible, Co salicidation is also applied to transistor formation. By constructing a simple cell structure with Ge/sub 2/Sb/sub 2/Te/sub 5/, we have observed reliable phase-transitions by driving current through MOS transistors. With 100 ns-writing pulses of 2 mA for rESET and 0.6 mA for SET, the device operates successfully with a considerable sensing signal at reading voltage of as low as 0.2 V.

关键词： CMOS technology Integrated circuit technology Nonvolatile memory read-write memory random access memory Clamps Fabrication Tellurium MOSFETs Low voltage

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PH-rESPONSIVE NANO-GEL PLUGGING MATErIAL, ANd PrEPArATION METHOd THErEFOr ANd USE THErEOF

PH-RESPONSIVE NANO-GEL PLUGGING MATERIAL, AND PREPARATION ME...

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作者： ZHANG, Jie 张洁 CHENG, rongchao 程荣超 FENG, Jie 冯杰 ZHAO, Zhiliang 赵志良 WANG, Shuangwei 王双威 LI, Long 李龙 ZHANG, Tianyi 张天怡

标准号: WO2023/279712(A1)

Provided in the present invention are a pH-responsive nano-gel plugging material, and a preparation method therefor and the use thereof. The pH-responsive nano-gel plugging material comprises the following raw materials in parts by mass: 50-70 parts of water, 2-3 parts of an emulsifier, 25-35 parts of an acrylic terpolymer, 10-15 parts of a polyalcohol compound, and 10-20 parts of a vinyl pyridine compound. The pH-responsive nano-gel plugging material can be applied to the plugging of Ordovician carbonate rock fractures and micro-karst cave strata, and can automatically identify Ordovician carbonate rock fractures and micro-karst cave leaking layers and realize effective blocking thereof.

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Triple-Cladding Ytterbium doped Fiber for 12 kW Single Module

Triple-Cladding Ytterbium Doped Fiber for 12 kW Single Modul...

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Asia Communications and Photonics Conference and Exhibition (ACP)

作者： Yue Meng Zuying Xu Xudong Shi Yu Li Tianying Liu Can Li Xiao Yan Wei Zheng Heng Wang Jiangang Yu Zhiyong Zhao Ming Tang Optical fiber R&D center Everfoton Technologies Corp oration Limited State Key Laboratory of Optic al Fiber and Cable Manufactu re Technology Yangtze Optical Fibre and Cable Joint Stock Limited Company Wuhan 4 China Optical fiber R&D center Everfoton Technologies Corp oration Limited Wuhan China Wuhan National Lab for Optoelectronics (WNLO) & National Engineering Laboratory for Next Generation Internet Access System School of Optical and Electronic Information Huazhong University of Science and Technology Wuhan China

High power continuous-wave ytterbium-doped fiber lasers have unique advantages such as high electro-optical efficiency, excellent beam quality and good thermal management, and are widely used in industrial materials processing and scientific research. However, multi-kW $(\geqslant$ 10kW) high-power fiber lasers has encountered numerous technology challenges in double-cladding fibers. In this work, we designed and fabricated a triple-cladding ytterbium doped fiber with large core diameter by using Modified Chemical Vapor deposition (MCVd) combined with all-gas-phase doping method. An excellent laser performance could be demonstrated for such a fiber with an output power of more than 10 kW and a slope efficiency of 82%, no Transverse Mode instability (TMI) is observed. Long-term laser stability at 12 kW-level was carried out in a master oscillator power amplifier (MOPA) laser system for 500 hours with power degradation less than 1%, meanwhile a stimulated raman scattering (SrS) suppression ratio that is larger than 45dB was obtained.

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Synthesis and fluorescence properties of dansyl labeled triazine dendrons

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IOP Conference Series: Materials Science and engineering 2020年第1期892卷

作者： Long Li rong-chao Cheng Cha Ma Hui-jun Hao Li-hua Li Zhi-liang Zhao Jiangxi Science and Technology Normal University Nanchang 330013 P. R. China CNPC Engineering Technology R&D Company Limited Beijing 100083 P. R. China Engineering Technology Research Institute BHDC Tianjin 300450 P. R. China

A series of fluorescent dendrons with dansulfonyl group as a fluorophore attached at the focal point were synthesized by a convergent method. There was no need for tedious and lengthy protection/deprotection or chromatographic separation. The method provided simple operation and high yield. Their fluorescence characteristic in dichloromethane was investigated. The results indicated that the dendritic modification had positive effect on the emission of fluorescence, and the emission maximum of dansylated dendrons was enhanced up to 20-fold. Meanwhile, the fluorescent intensity of dansylated dendrons could be remarkably improved with the increase of dendron generation. These findings can contribute significantly to the general understanding of the dendron systems and also for potential applications in photochemical molecular devices and organic electroluminescent devices.

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Vector mode inter-modal wavelength conversion in a dispersion tailored highly nonlinear few-mode fibre

Vector mode inter-modal wavelength conversion in a dispersio...

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45th European Conference on Optical Communication (ECOC 2019)

作者： Jitao Gao Elham Nazemosadat Jochen Schröder Chen Yang Songnian Fu Ming Tang deming Liu Weijun Tong Magnus Karlsson Peter A Andrekson National Engineering Laboratory for Next Generation Internet Access System School of Optics and Electronic Information Huazhong University of Science and Technology 430074 Wuhan China Photonics Laboratory Department of Microtechnology and Nanoscience Chalmers University of Technology SE-41296 Gothenburg Sweden R&D Center Yangtze Optical Fibre and Cable Joint Stock Limited Company (YOFC) 430073 Wuhan China

We present the design and fabrication of a dispersion tailored highly nonlinear few-mode fibre with an inter-modal nonlinear coefficient of 2.81 (W · km) −1 , the highest reported to date. Inter-modal wavelength ...

ISBN: (纸本)9781839531859

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