三维地震勘探技术在多组系复杂构造区的应用

勘探区位于川东高陡复杂地区,工区地表、地震地质条件复杂,地质构造受多期次多组系应力作用,虽经过了多次二维地震勘探,但仍然难以搞清各构造之间的相互接触关系及区内断层的断点位置和组合关系.在该地区进行的三维地震勘探施工中,通过优化野外采集施工方式、室内地震资料处理技术措施、三维可视化技术精细地震资料对比解释技术,提高了地震...     

Soft error modeling and analysis of the Neutron Intercepting Silicon Chip (NISC)

Soft errors are transient errors caused due to excess charge carriers induced primarily by external radiations in the semiconductor devices. Soft error phenomena could be used to detect thermal neutrons with a neutron monitoring/detection system by enhancing soft error occurrences in the memory devices. This way, one can convert all semiconductor memory devices into neutron detection systems. Such a device is being developed at The Pennsylvania State University and named Neutron Intercepting Silicon Chip (NISC). The NISC is envisioning a miniature, power efficient, and active/passive operation neutron sensor/detector system. NISC aims to achieve this goal by introducing ¹⁰B-enriched Borophosphosilicate Glass (BPSG) insulation layers in the semiconductor memories. In order to model and analyze the NISC, an analysis tool using Geant4 as the transport and tracking engine is developed for the simulation of the charged particle interactions in the semiconductor memory model, named NISC Soft Error Analysis Tool (NISCSAT). A simple model with ¹⁰B-enriched layer on top of the lumped silicon region is developed in order to represent the semiconductor memory node. Soft error probability calculations were performed via the NISCSAT with both single node and array configurations to investigate device scaling by using different node dimensions in the model. Mono-energetic, mono-directional thermal and fast neutrons are used as the neutron sources. Soft error contribution due to the BPSG layer is also investigated with different ¹⁰B contents and the results are presented in this paper.     

基于纳什均衡的需求响应多用户策略研究

随着能源互联网的出现和智能电网的发展,使得电能供给与电能需求能够更紧密的联系,也促进了电力交易市场条件下需求响应的信息化和智能化,用户根据自身情况在需求响应市场上进行出价与竞争,也更好的反映了电能的市场价值。本文结合智能电网下的需求响应市场,描述了多用户对电能竞争的一般场景与模型,从理论和算法上分析用户出价与市场调节的最优化问题,在给定的一般情况下,证明了存在一个纳什均衡,使得市场竞价能得到一个最终解的集合,实现用户竞争后的稳定解,同时给出了优化问题解的一个高效算法。     

Spurious roots in nonlinear waveguide calculations and a new formatfor nonlinear waveguide dispersion equations

The existence of spurious roots in the widely used nonlinear waveguide dispersion equations is demonstrated. The spurious roots exist even when the linear waveguide dispersion equations are written in terms of the sine and cosine functions. The authors compare the similarities between the linear and nonlinear dispersion equations and present a new format of the nonlinear dispersion equations that simplify the numerical calculations and avoid the appearance of spurious roots     

浅析利用抽芯成果判断深层搅拌桩复合地基承载力

该文以在工程检测中大量抽取搅拌桩水泥土芯样的无侧限抗压强度的实际数据为基础 ,从正确理解文献 [2 ]折减系数与水泥土安全分项系数和搅拌桩安全分项系数的关系 ,提出如何理解搅拌桩的设计意图 ,从而对利用搅拌桩芯样的无侧限抗压强度来判断深层搅拌桩的质量提出了看法 ,并对如何设计深层搅拌桩提出了建议     

环氧型水性自泳漆的研制

采用"己二酸与环氧树脂酯化反应+氨水中和+相反转"工艺制备高稳定性的水性环氧乳液,加入活化剂、颜料浆、去离子水等,制备了环氧型水性自泳漆。样板实验结果表明:漆膜表面光滑平整、有光泽,耐盐雾实验时间为360h,达到汽车车身底漆I级防腐标准,具有较好的市场应用潜力。     

Redistribution of internal forces in the lateral bracing system / Schnittgrößenumlagerungen bei der Gebäudeaussteifung

The lateral bracing system of a building should ensure the stability of the building, in terms of the usability and the total load capacity. The governing loads for the lateral bracing system are horizontal loads due to wind and earthquake. The horizontal loads are traditionally distributed to the bracing elements according to the uncracked elastic state dependent on the bending stiffness in the elastic (uncracked) state. This method does not allow consideration of non‐linear effects and load redistribution. Within the framework of the PRB Research Cooperation – Improving the Practical Use of Structural Design Standards through pre‐normative work – Subcontract 5: Masonry Construction, Subproject 3: “Large Shear Walls” [7], the cracked or plastic state can be taken into account through a displacement based approach. A matrix formulation for both the linear and cracked states has been derived and implemented.     

不同煤层掘进工作面瞬变电磁法探测应用研究

煤矿井下瞬变电磁法成为煤矿井下超前探测工作的重要手段,在矿井水害预测预报上发挥着很大的作用。随着矿井上组煤层资源的逐渐枯竭,煤矿开采资源逐渐延伸向下组煤层。同一井田范围内同煤层及其顶底板的岩性特征一般相差不大,瞬变电磁法在同煤层施工过程中接收到的物理背景场较为接近;而不同煤层及其顶底板岩性特征通常会有较大的差别,瞬变电磁法在不同煤层施工过程中会接收到差别较大的物理背景场。当矿井存在多煤层开采时,通过大量数据研究瞬变电磁法在不同煤层巷道探测中的响应特征规律,分析并掌握不同煤层条件对瞬变电磁法探测结果的影响,能够提高瞬变电磁法在多煤层探测成果的准确性。     

Epitaxial Growth of 1D Te/2D MoSe2 Mixed-Dimensional Heterostructures for High-Efficient Self-Powered Photodetector

Mixed-dimensional heterostructures provide additional freedom to construct diverse functional electronic and optoelectronic devices, gaining significant interest. Herein, highly-aligned pseudo-1D tellurium is epitaxially grown on 2D monolayer transition metal dichalcogenides (TMDs), including MoSe₂, MoS₂, and WS₂. A one-pot chemical vapor deposition (CVD) technique eliminates the normally required transfer steps, thereby producing mixed-dimensional heterostructures with an ultraclean interface. The controllable epitaxial growth of Te/TMD heterostructures are verified by Raman, scanning probe microscopy (SPM), and transmission electron microscopy (TEM) observation. The photoluminescence results indicate that the emission from TMDs is quenched in the heterostructure, confirming the efficient transfer of photogenerated carriers from TMDs to Te. Additionally, the mixed-dimensional p-n Te/MoSe₂ heterojunction photodetector presents self-driven behavior with high responsivity (328 mA W⁻¹), external quantum efficiency (79%), and specific detectivity (8.2 × 10⁹ Jones). The modified facile synthesis strategy and proposed growth mechanism in this study shed light on synthesizing mixed-dimensional heterojunctions. This opens avenues for fabricating functional devices with reduced sizes and high densities, further enabling miniaturization and integration opportunities.     

采煤机行走部传动系统动态特性研究

采煤机行走部传动系统力学特性复杂,实际工作中由于行走故障导致采煤机停机的现象频发.为改善采煤机的行走特性,提高其行走可靠性,建立了采煤机行走部传动系统的多体动力学仿真模型,研究了传动系统动力学特性,提取了不同行走速度、不同行走负载下的齿轮啮合力和输出角速度波动曲线,分析了啮合力和输出角速度随行走速度、行走负载变化的规律...