Chinese Academy of Sciences

Southwest Petroleum University

University of Electronic Science and Technology of China

Fei Zhang

Xiangang Luo

Mingbo Pu

Xiaoliang Ma

Jie Xiong

Xian Peng

Yanrong Li

Bowan Tao

Chaoren Li

Zihan Zhao

Xiaohui Zhao

Yan Chen

Xiong Li

Zeyu Zhao

Qian Li

Tao Li

Yulong Zhao

Xiaohua Tan

Xiaoping Li

Yan Zhang

Ruihan Zhang

Mingqing Kui

Zhenglin Mao

Longxin Li

Yongchao Wang

Ting Xie

Miaofeng Cui

Daijin Zhuang

Xixiang Liu

The present disclosure provides a high-order rotational symmetry unit-based nonlinear geometric phase metasurface, which sequentially comprises from the bottom to the top: a substrate (); a nonlinear material layer (); and a metasurface structure layer (), comprising multiple super-configuration units () having local high-order rotational symmetry, wherein the super-configuration units () are periodically arranged to form a lattice structure which has global high-order rotational symmetry. Under the pumping of fundamental waves in a circular polarization state, the nonlinear geometric phase metasurface can simultaneously generate nonlinear harmonic waves having the same and opposite circular polarization states as the fundamental waves, and a nonlinear geometric phase of the generated nonlinear harmonic waves is regulated and controlled by a local rotational symmetry order and lattice structure of the super-configuration units.

High-order rotational symmetry unit-based nonlinear geometric phase metasurface

The present disclosure relates to a prediction method for constant production decline of a water-producing gas well in a highly heterogeneous reservoir. The prediction method mainly includes: collecting related data of a target water-producing gas well, fitting to obtain a water-drive constant and a water invasion constant, fitting dynamic reserves by adopting a Blasingame plotting method, conducting fitting by adopting a dual-medium model to obtain an elastic storativity ratio and an interporosity flow coefficient, calculating a reservoir heterogeneity coefficient, obtaining a flowing bottomhole pressure at the later stage of stable production, calculating formation pressure of a new day through quantitative production of the target water-producing gas well with 1 day as an iteration stride, performing iteration until the formation pressure is less than or equal to the formation pressure at the end of stable production, and drawing a prediction curve about constant production decline of the target water-producing gas well.

Prediction method for constant production decline of water-producing gas well in highly heterogeneous reservoir

A metasurface-based imaging system, a design method, and a detector. In an optical axis direction, the metasurface-based imaging system sequentially comprises: a quadratic-phase-based metasurface structure, consisting of a sub-wavelength unit structure array () and a substrate (), the metasurface structure being a monolayer structure and used for implementing preset phase distribution; and a wavevector filter (), each position of which is equivalent to one aperture stop, the wavevector filter having a filtering function and having different wavevector modulation effects under different incident angles. The metasurface-based imaging system has the advantages of being ultra-light, ultra-thin, and high in imaging quality, and can achieve large-area, ultra-thin, and large field-of-view imaging detection.

Metasurface-based imaging system, design method, and detector

An apparatus for evaluating a dried crystal error in a COdrying experiment comprises a heating jacket, a visual container, a weighing device, a transparent cover, a control apparatus, a vacuum pump, a damping table and a heating apparatus, and can accurately dry and weigh a rock sample subjected to a carbon dioxide drying effect experiment in the visual container, so that the crystal error caused by evaporation of a solution in the rock sample in the process is calculated. This apparatus provided by the present invention has high precision and simple operation, can well evaluate the crystal error caused by the saline solution retaining in the rock sample when the rock sample is directly dried in the carbon dioxide drying effect experiment, and can correct the results of the carbon dioxide drying effect experiment compared with the prior art, thereby obtaining accurate experiment results.

Apparatus for evaluating dried crystal error in COdrying experiment and use method thereof

The invention provides a thin film deposition system and a method, and relates to the field of thin film deposition. The deposition method comprises the following steps: 1) heating metal substrate; carrying out deposition. The method is characterized in the step 1) that a current is conducted into the metal substrate at one end of the growth zone by one electrode, and out of the metal substrate at the other end of the growth zone by the other electrode, so that the metal substrate is heated by the heat emitting of the resistant of the metal substrate itself. According to the method, the quality of the prepared thin film is improved, while the preparation cost of the thin film is reduced. In addition, the consistent double-sided thin films can be easily prepared on two surfaces of the metal substrate by employing the system and method.

Thin film deposition preparation device and method

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Chengdu, China

Fei Zhang