Topological photonic crystals (PCs) with exotic optical properties such as helical edge states have tremendous potential applications in the fields of integrated circuits. Here, we propose a sandwich PC structure based on trivial-nontrivial-trivial topology robust unidirectional light propagation through coupling two nontrivial topological region. We calculate dispersion relations structures and observe excited by an external point source orbital angular momentum. To evaluate stability flow,...

Abstract The oil and gas industry is increasingly focusing on exploring developing resources in deep earth layers. At high temperatures, confining pressures, geostress differences, rock has the mechanical characteristics of plastic enhancement, which leads to unclear mechanism hydraulic fracture expansion. current fracturing model construction design lack pertinence, reform difficult achieve expected effect. This paper established a elastoplastic propagation reservoirs. It considered...

Topological edge states and pseudo spins are promising paradigms to explore a new phase of matter in condensed physics. Here, we reveal the regulatory mechanism for guiding spin along interface between trivial topological regions with elliptic cylinders made conventional silicon material. A spin-guiding path introduced by an arrangement exhibits high efficiency, large operation bandwidth robustness imperfections tunable parameters. The four types silicon-based unit cells measured, which may...

Abstract Most tight oil reservoirs need to be hydraulically fractured before putting into production. Refracure is a necessary and efficient way control production decline after first fracturing treatments. It has been recognized that reorientation of propped refracure treatments can contact with undepleted reservoir areas one the main mechanisms for enhancement. In this paper, laboratory tests fracture were investigated. Case histories tiltmeter mapping results discussed. All included novel...

Topologically protected edge states of honeycomb photonic crystals (PCs) have been extensively studied in recent years. Here we propose several optimized two-dimensional PC configurations with distinct line defects introduced by breaking the C6 symmetry each topological lattice along interfaces between two different topologies. The spin-flipping nature defect modes these is measured, which expected to offer a novel realization mechanism quantum spin Hall effect. can be treated as...

Abstract Since the year of 2005 output new well has been basically from tertiary infillers in Xingnan development block No.5 Oil Production Plant, Daqing Oilfield Co., Ltd., where we mainly produce thin and poor quality oil layers tabulated reservoirs (those included reserve tabulation which was made at beginning Oilfield) untabulated excluded that tabulation). The intended zones often grow reservoir groups Sa II SaIII Pu I. In such reservoirs, sublayers to be perforated are comparatively...

In the paper we present an implementation of resonance coupling between a unidirectional air waveguide and two cavities with one-way rotating state in two-dimensional dielectric photonic crystal magneto-optical crystal. We theoretically calculate dispersion curves line defect waveguide-cavity interaction, respectively. Numerical simulations show that, via coupling, series interesting phenomena can be generated system. By modifying direction applied external magnetic field, storing...

Abstract Due to the existence of multi-fracture and extension in volcanic gas reservoirs, success ratio stimulation is very low as well stimulating scale. Based on unique simulation model for fracturing development growth during stimulation, some important topics were studied: (1) effect natural micro-fracture parameters vs. formation stimulated fractures. (2) The magnitude affecting by different characters reservoir scale treatments. A new method was summarized determine operation...

Integrated Technologies of Testing and Controlling for High Efficiency Separate Layer Water Injection He Liu; Liu PetroChina Co. Ltd Search other works by this author on: This Site Google Scholar Danfeng Xiao; Xiao Daqing Oilfield Ltd. Li Zhi Zhao; Zhao Oil Company Fukun Zhang; Zhang Yumei Wang; Wang Xianhui Lv; Lv Xueqing Paper presented at the International Petroleum Technology Conference, Kuala Lumpur, Malaysia, December 2008. Number: IPTC-12516-MS https://doi.org/10.2523/IPTC-12516-MS...

For reflecting those behaviors in the simulation that pedestrians choose to wait, scrape or round after being trapped local minimum, based on static spatial potential field with big grid, dynamic is obtained adding time-consumption and waiting field. Time-consumption replaces traditional pedestrian repulsive changes grid space occupancy while has attribution of attenuation enhancement together. Simulation experiments are used verify various selections make when they face different occupancy....

Alaska is one of the most seismically active areas in North America. Large-scale seismic event occurrence more than ten times greater California. Approximately 40–50% communities with 60% total population are located zones 3 and 4, which potential for high risk. Due to limited access isolated locations many these communities, a much reliance placed on essential, lifeline facilities. In addition, higher per capita investment exists facilities, any recovery effort or needed repairs expected be...