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Effects of aggregate size distribution and carbon nanotubes on the mechanical properties of cemented gangue backfill samples under true triaxial compression

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 311-324页

作者： Qian Yin Fan Wen Zhigang Tao Hai Pu Tianci Deng Yaoyao Meng Qingbin Meng Hongwen Jing Bo Meng Jiangyu Wu State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering China University of Mining and TechnologyXuzhou 221116China State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines Anhui University of Science and TechnologyHuainan 232001China State Key Laboratory for Geomechanics&Deep Underground Engineering China University of Mining and Technology(Beijing)Beijing 100083China Key Laboratory of Xinjiang Coal Resources Green Mining Ministry of EducationXinjiang Institute of EngineeringUrumqi 830023China

The mechanical behavior of cemented gangue backfill materials(CGBMs)is closely related to particle size distribution(PSD)of aggregates and properties of cementitious ***,the true triaxial compression tests,CT scanning,SEM,and EDS tests were conducted on cemented gangue backfill samples(CGBSs)with various carbon nanotube concentrations(P_(CNT))that satisfied fractal theory for the PSD of *** mechanical properties,energy dissipations,and failure mechanisms of the CGBSs under true triaxial compression were systematically *** results indicate that appropriate carbon nanotubes(CNTs)effectively enhance the mechanical properties and energy dissipations of CGBSs through micropore filling and microcrack bridging,and the optimal effect appears at P_(CNT)of 0.08wt%.Taking PSD fractal dimension(D)of 2.500 as an example,compared to that of CGBS without CNT,the peak strength(σ_(p)),axial peak strain(ε_(1,p)),elastic strain energy(Ue),and dissipated energy(U_(d))increased by 12.76%,29.60%,19.05%,and90.39%,***,excessive CNTs can reduce the mechanical properties of CGBSs due to CNT agglomeration,manifesting a decrease inρ_(p),ε_(1,p),and the volumetric strain increment(Δε_(v))when P_(CNT)increases from 0.08wt%to 0.12wt%.Moreover,the addition of CNTs improved the integrity of CGBS after macroscopic failure,and crack extension in CGBSs appeared in two modes:detour and pass through the ***σ_(p)and U_(d)firstly increase and then decrease with increasing D,and porosity shows the opposite ***ε_(1,p)andΔε_(v)are negatively correlated with D,and CGBS with D=2.150 has the maximum deformation parameters(ε_(1,p)=0.05079,Δε_(v)=0.01990)due to the frictional slip effect caused by coarse *** increasing D,the failure modes of CGBSs are sequentially manifested as oblique shear failure,"Y-shaped"shear failure,and conjugate shear failure.

关键词： cemented gangue backfill materials particle size distribution true triaxial compression test carbon nanotubes mechanical properties failure modes

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Research on Noise Control for Ventilators with Resonance

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Journal of China University of Mining and technology 2006年第1期16卷 25-27页

作者： GUO Chu-wen SUN Fei-hong College of Mechanical and Electrical Engineering China University of Mining ＆ Technology Xuzhou Jiangsu 221008 China xuzhou institute of architectural technology Xuzhou Jiangsu 221008 China

A study was carried out to control the noise produced by the ventilators at the Luling coalmine, which had caused serious noise pollution to the residents living around the mine for a long time. The main noise source was found to be the dynamic noise at the outlet of the diffuser. The frequency of its peak value was 250 Hz. A special brick with a resonant frequency of 250 Hz was designed to eliminate this noise. The diffusion of a lower frequency noise has been successfully controlled by the installation of a noise-eliminating tower above the diffuser outlet. The detection results show that the noise in the nearby residential area has been lowered to an average 55.3dB(A) in the daytime from 69.8dB(A) and to 48.4dB(A) at night from 65.8dB(A).

关键词： Resonance noise ventilator noise control coalmine

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Strength properties and evolution laws of cracked sandstone samples in re-loading tests

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International Journal of Mining Science and technology 2020年第2期30卷 251-258页

作者： Yijiang Zong Lijun Han Qinbin Meng Yingchao Wang State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining&TechnologyXuzhou 221116China School of Transportation Engineering Jiangsu Vocational Institute of Architectural TechnologyXuzhou 221116China

To study the strength properties and evolution laws of cracked sandstone samples in re-loading tests,strength and damage evolution properties of intact sandstone samples were first analyzed through the triaxial compression tests carried on TAW-2000 microcomputer control electro-hydraulic servo rock triaxial test *** evolution models were established based on dilatancy properties realizing the real-time and quantitative evaluation of samples damage state in loading *** this basis,samples with different damage were obtained by pre-peak,peak point,post-peak and residual strength stage unloading tests in the loading process of intact *** characteristics of the stress-strain curves and strength evolution laws were studied through the re-loading tests of samples with different damage under different stress *** experimental results showed that the slope of stress-strain curves,peak strength and residual strength of cracked samples increased linearly with confining pressure and decreased linearly with *** equivalent cohesion decreased with damage in the exponential decay *** mechanics properties of samples transformed from strain softening to strain hardening with damage.

关键词： Rock mechanics Damage Re-loading Strength characteristics Strain hardening

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One-Step Implementation of Mulitqubit Quantum Phase Gate in a Cavity QED System

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Chinese Physics Letters 2008年第2期25卷 379-382页

作者：樊秋波 College of Mathematics and Physics Xuzhou Institute of Technology Xuzhou 221008

An alternative protocol is proposed to implement three-qubit phase gate between photon and atoms in a high-Q bimodel optical cavity. The idea can be extended to directly implement N-qubit phase gate, and the gating time that is required to implement the protocol does not rise with increasing number of qubits. The influence of cavity decay and atomic spontaneous emission on the gate fidelity is also discussed.

关键词： pulsars x-ray spectra relativity and gravitation redshift

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Remote Preparation of Photon Polarization States within a Network

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Chinese Physics Letters 2008年第1期25卷 20-23页

作者：樊秋波 College of Mathematics and Physics Xuzhou Institute of Technology Xuzhou 221008

We propose a new linear optical protocol for remote state preparation （RSP） between two parties under control of a number of controllers in terms of optical elements. The realization of this protocol is appealing due to the fact that the quantum state of light is robust against the decoherence, and photons are ideal carriers for transmitting quantum information over long distances.

关键词： pulsars x-ray spectra relativity and gravitation redshift

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Effect of Al_(2)O_(3) Nanoparticle on Cavitation Strengthening of Magnesium Alloys

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Fluid Dynamics & Materials Processing 2021年第2期17卷 501-509页

作者： Lei Liu Chuanhui Huang Xinghua Lu Ping Yu Longhai Li Huafeng Guo xuzhou institute of technology Xuzhou221000China

In order to study the effect of Al_(2)O_(3) nanoparticles in the cavitation-based strengthening process of magnesium alloys,the impact of a micro-jet generated by bubble collapse has been *** strengthening mechanism is based on the transfer of the energy of cavitation due to bubble collapse to Al_(2)O_(3) particles,which then undergo collision with the surface of the *** hardness,surface morphology,element content and chemical state of the strengthened samples have been analyzed by microhardness tests,SEM(scanning electron microscopy)and XPS(X-ray photoelectron spectroscopy)*** results show that:after 5 min of strengthening,nanoparticles can be found on the surface of the sample through *** with XPS tests,the content of Al_(2)O_(3) in the sample can be significantly increased,indicating that Al_(2)O_(3) particles penetrate into the surface and increase its hardness by 29.1 HV.

关键词： Cavitation nanoparticles strengthening SEM XPS

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Design and Experiment-Based Optimization of High-Flow Hydraulic One-Way Valves

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Fluid Dynamics & Materials Processing 2020年第2期16卷 211-224页

作者： Lei Liu Ping Yu xuzhou institute of technology Xuzhou221000China

High-flow hydraulic one-way valves in water pipes are typically used to mitigate conditions,which would otherwise cause vibration and cavitation erosion after long-term *** prevent cavitation and enhance the performance of hydraulic one-way valves,in the present work a dedicated experimental study has been *** structural parameters relating to the pilot valve core,the main valve core,and the through-flow section of the considered flow channel have been changed to analyse reverse impact,and cavitation,*** results show that the control pressure has a weak effect on the cavitation characteristics,while changes in the structural parameters can significantly affect *** particular,the cavitation index,representing the extent of cavitation,has been found to display a linear correlation with the inlet pressure,but,not with the inlet flow *** importantly,a stepped throttling structure can reduce the pressure oscillation,improve the response speed,enhance the impact characteristics,and decrease the likelihood and severity of *** larger the flow passage area,the shorter the unloading *** mainly occurs when the pilot valve core is fully *** stepped main valve core throttling structure has been found to be an optimal option.

关键词： High-flow structural design impact cavitation

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Enhanced continuous-variable entanglement by a pair of nonlinearly coupled waveguides

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Science China(Physics,Mechanics & Astronomy) 2009年第9期52卷 1307-1312页

作者： WANG KeQuan FAN QiuBo College of Mathematics and Physics Xuzhou Institute of TechnologyXuzhou 221008China

We seek to analyze a three-level cascade laser with a pair of nonlinearly coupled waveguides inside the cavity. Applying the pertinent master equation, we investigate the squeezing and entanglement properties intracavity produced by our system. It is shown that with the help of nonlinearly coupled waveguides highly squeezed as well as macroscopic entangled light with high intensity can be achieved.

关键词： nonlinearly coupled waveguides three-level cascade laser continuous-variable entanglement

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Controlled remote implementation of partially unknown quantum operation

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Science China(Physics,Mechanics & Astronomy) 2008年第11期51卷 1661-1667页

作者： FAN QiuBo LIU DongDong College of Mathematics and Physics Xuzhou Institute of TechnologyXuzhou 221008China

A protocol for controlled remote implementation of a partially unknown operation on an arbitrary quantum state is proposed. In this protocol, a task can be performed using a GHZ state shared among three distant parties: Alice, Bob and the controller Charlie. This protocol is also generalized to the multi-party control system based on sharing an N-qubit GHZ state.

关键词： remote implementation GHZ state Hadamard operation

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Implementation of the Fredkin gate with a three-qubit mixed-spin Heisenberg model

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Science China(Physics,Mechanics & Astronomy) 2010年第7期53卷 1276-1280页

作者： FAN QiuBo College of Mathematics and Physics,xuzhou institute of technology,xuzhou 221008,China College of Mathematics and Physics Xuzhou Institute of Technology Xuzhou China

We show that a local unitary(LU) equivalent Fredkin gate can be obtained from the free evolution of three mixed-spin qubits by virtue of numerical simulation with only one *** spin-1 qubit acts as the control qubit,and two spin-1/2 qubits,which interact with the spin-1 qubit via the first neighbor spin interaction,respectively,play the role of target *** also examine the imperfect Fredkin gate operation by considering the effects of nonidentical coupling constants,uniform and inhomogeneous magnetic fields.

关键词： Fredkin gate mixed spin quantum computation

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