Zhejiang University

Alibaba Group Holding Limited

Advanced New Technologies Co., Ltd.

Self Electronics Co., Ltd.

Zhejiang Nhu Company Ltd.

Zhejiang Sci-Tech University

Shandong Nhu Pharmaceutical Co., Ltd.

Sanhua (Hangzhou) Micro Channel Heat Exchange Co., Ltd

Lei Zhao

Jing Hou

Jian Bai

Binjie Lu

Hong Tang

Xiao Huang

Xiangdong Zhou

Jiang Feng

Zhirong Chen

Jianguo Dong

Jianlong Jiang

Haoran Li

Guojun Xu

Jinyuan Qian

Yougui Zhou

Dongming Qi

Ming Yu

Weikang Shao

Yin Zhang

Yuhong Zhang

Jintao Yuan

Zhenhao Lin

Guangxiong Yu

Weiwei Su

Xingxing Shi

Zhenlong Guo

Ming Feng

Haobo Jiang

Jiawei Li

Fenping Wang

Guiping He

Xiandong Zhu

A phase retrieval detection device based on diffraction information fusion of a Fresnel zone plate (FZP) () is provided, including a laser (), an attenuation mirror (), a micro-objective (), a pinhole filter (), a collimating objective (), an element () to be detected, an FZP (), and an image acquisition device () that are sequentially arranged along a light path. The phase retrieval detection device uses the FZP () as a light beam convergent element instead of a conventional lens, and makes an acquired diffraction spot contain more diffraction information by virtue of a multi-focus characteristic of the FZP (). Based on a classical iterative phase retrieval method, a phase retrieval method based on the diffraction information fusion of the FZP () uses a diffraction light intensity distribution modulated by the FZP for retrieval to reconstruct a wider band of a wavefront to be detected.

Phase retrieval detection device and method based on diffraction information of fresnel zone plate

A hydrogen pressure-reducing valve having automatic pressure-relief and cut-off functions and a method therefor. The hydrogen pressure-reducing valve includes a main pressure-reducing valve and a cut-off valve. The cut-off valve includes a gas flow inlet, a valve rod whose disposed with a cut-off valve element, and a gas flow outlet. The gas flow inlet is used to connect with an external gas inlet pipe. The gas flow outlet communicates with the adjustment channel. A target gas enters the adjustment channel through the gas flow outlet and act on a second disc-shaped end part. The valve rod is disposed with a pressure-relief channel whose includes a control end and an exhaust end. The exhaust end communicates with the outside world. The control end communicated with a valve body inner cavity of the cut-off valve when the cut-off valve element is closed, and closed when the cut-off valve element is opened.

Hydrogen pressure-reducing valve having automatic pressure-relief and cut-off functions and method therefor

A method for synthesizing a polymer/pigment hybrid latex through sulfur-free and soap-free in-situ reversible addition-fragmentation chain transfer (RAFT) emulsion copolymerization includes the following: dispersing a pigment with a reactive emulsifier to prepare a pigment dispersion; synthesizing an amphiphilic sulfur-free ω-vinyl-terminated polymethyl methacrylate (PMMA) macromolecular RAFT agent in-situ on a surface of pigment particles through catalytic chain transfer polymerization (CCTP); and adding an acrylate monomer dropwise, allowing in-situ sulfur-free RAFT polymerization on a surface of pigment particles through the RAFT agent, and adjusting a structure and a composition of an encapsulated polymer layer to obtain a series of uniformly encapsulated and stably dispersed polymer/organic pigment hybrid latexes. The new hybrid latex prepared through sulfur-free and soap-free in-situ RAFT emulsion copolymerization has the characteristics of high dispersion stability, high pigment encapsulation efficiency, clear encapsulated polymer layer sequence, controllable structure, etc., which is suitable for surface encapsulation modification of various pigments.

Method for synthesizing polymer/pigment hybrid latex through sulfur-free and soap-free in-situ reversible addition-fragmentation chain transfer (RAFT) emulsion copolymerization

The present application discloses a heat exchange apparatus and a heat pump system provided with same. The heat exchange apparatus includes a heat exchanger and a refrigerant adjustment container with an opening, the heat exchanger includes a first header, a second header and a plurality of heat exchange tubes, two ends of each heat exchange tube are respectively connected to the first header and the second header so as to connect the first header and the second header, and the opening of the refrigerant adjustment container is either of the first header and the second header. The heat exchange apparatus in the present application has the refrigerant adjustment container for adjusting refrigerant in the system, so as to improve system effectiveness.

Heat exchange apparatus and heat pump system provided with same

The present disclosure provides an apparatus and method for wavefront reconstruction based on rotationally symmetric extended structured light illumination. The apparatus includes a laser device, a neutral density filter, a microscope objective, a pinhole, a collimating lens, a beam splitter prism, a spatial light modulator, a lens to be measured, and an image acquisition device that are sequentially arranged. The method permits modulation of incident parallel light into phase grating-like structured light by using a spatial light modulator. Based on the characteristic of non-infinitely small pixel unit of the spatial light modulator, changing the modulation pattern of the spatial light modulator may result in different forms of structured light. Not only the object to be measured but also the real structured light wavefront can be recovered by acquiring diffraction spots at the focal plane and simultaneously updating the object plane and the structured light plane using an algorithm.

Apparatus and method for wavefront reconstruction based on rotationally symmetric extended structured light illumination

The disclosure provides a device for detecting a wavefront error by modal-based optimization phase retrieval using an extended Nijboer-Zernike (ENZ) theory. The detection device includes a point light source (), a half mirror (), a lens () to be tested, a plane mirror () and an image sensor (). The wavefront error of the component under test is characterized by using a Zernike polynomial, and a Zernike polynomial coefficient is solved based on an ENZ diffraction theory. The present disclosure realizes the one-time full-aperture measurement on the wavefront error of a large-aperture optical component, and can use a partially overexposed image to achieve accurate wavefront error retrieval. Meanwhile, the present disclosure overcomes the contradiction between underexposure and high signal-to-noise ratio (SNR) caused by a limited dynamic range when the image sensor () acquires an image. The detection device is simple and does not have high requirements for the experimental environment.

Device and method for detecting wavefront error by modal-based optimization phase retrieval using extended Nijboer-Zernike theory

A wireless network connection security method is disclosed, including: acquiring a type of a wireless network to which a mobile device is connected; determining that the type of the wireless network is insecure; monitoring an application, the application being installed on the mobile device; determining that the application is to be activated; and in response to the determination that the application is to be activated, establishing a secure communication channel between the mobile device and a first server.

System and method for wireless network security

Apparatuses and methods are disclosed for identity authentication. An exemplary method may include obtaining biometric information for authentication collected by a terminal, and identity information sent by the terminal. The method may also include obtaining prestored biometric information corresponding to the identity information. The method may further include determining whether the biometric information for authentication matches the prestored biometric information. If yes, the method may include determining that the identity authentication is successful. Otherwise the method may include determining that the identity authentication is not successful.

Method and apparatus for identity authentication

An ultra-thin surface mounted LED lamp having surface emitting light includes a house, a light module, a reflection film, a light guide plate, and a plurality of light guide points provided on the light guide plate. The light module is striped and includes a plurality of LED chips. A maximum distance between the two LED chips at a head and tail of the light module accounts for two-thirds of the total circumference of the side walls. The light guide plate includes an incident wall configured for receiving the emitted light of the light module and a reflecting wall configured for reflecting light. A length of the incident wall is equal to the maximum distance between the two LED chips at the head and tail of the light module. The light guide points are spaced apart circular dots, the total area of which is 60% to 65% of the total area of the light guide plate.

Ultra-thin surface mounted LED lamp having surface emitting light

The present invention discloses a method for preparing optically active carbonyl compound, comprising the following steps: under the catalysis of chiral amine salt and transition metal catalysts, with hydrogen and catalytic amount of dihydropyridine compound as hydrogen source, use &#x3b1;, &#x3b2;-unsaturated aldehydes or &#x3b1;, &#x3b2;-unsaturated troponoid compounds to conduct asymmetric catalytic reaction to obtain the optically active carbonyl compound. This method comes in moderate reaction condition, simple operation, and catalytic amount of dihydropyridine compounds usage, the target product is easy to be separated and purified from the reaction system, and the metal catalyst can be recycled, it is economical.

Method for preparing optically active carbonyl compound

Growing community of inventors

Hangzhou, China

Lei Zhao