Patents Assigned to Zhejiang University
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Patent number: 11220478Abstract: The present disclosure discloses a preparation method for 4-phenylthio-benzenethiol. The preparation method comprises the following steps: subjecting phenyl sulfide as a raw material to a halogenation reaction to obtain 4-halophenyl sulfide; subjecting the 4-halophenyl sulfide to a sulfhydrylation reaction to obtain a 4-phenylthio-phenylthiolate; and subjecting the 4-phenylthio-phenylthiolate to acidification. The preparation method of the present disclosure avoids the use of materials such as thiophenol which pollutes the environment, and realizes efficient recycling of the reaction materials, solvents, water and the like. The preparation method of the present disclosure is a green process for the synthesis of 4-phenylthio-phenylthiol without organic waste, waste acid and waste water discharge.Type: GrantFiled: July 12, 2018Date of Patent: January 11, 2022Assignees: Zhejiang NHU Company Ltd., Zhejiang University, Zhejiang NHU Special Materials Co., Ltd.Inventors: Zhirong Chen, Woyuan Li, Hong Yin, Guíyang Zhou, Haoran Li, Shuaifeng Pan, Ming Lian, Guangde Qin, Qichuan Li
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Patent number: 11214656Abstract: A preparation method of a cross-linked sodium hyaluronate gel is disclosed, which including: preparing an alkaline aqueous solution of hyaluronic acid: formulating a sodium hyaluronate alkali liquor with the concentration of 10-30% g/ml; and carrying out a cross-linking reaction: the cross-linking agent used in the cross-linking reaction being divinyl sulfone or 1,4-butanediol diglycidyl ether, the cross-linking reaction being carried out in an alkaline aqueous solution of hyaluronic acid, the reaction temperature of the cross-linking reaction being 20-40° C., the time of the cross-linking reaction being 4-8 h, and the like. The method of this invention has many advantages, such as easily available raw materials, mild reaction conditions, high cross-linking efficiency, simple process and post-treatment, and easy operation.Type: GrantFiled: December 29, 2019Date of Patent: January 4, 2022Assignees: Hangzhou Singclean Medical Products Co., Ltd, Zhejiang University of Science and TechnologyInventors: Zhiguo Zhang, Yange Suo, Wei Huang, Weiqing Sun
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Publication number: 20210399724Abstract: A gate voltage magnitude compensation equalization method and circuit for series operation of power switch transistors are provided. A dynamic voltage equalization of series-connected power switch transistors is implemented by using sampling principles where voltages of the power switch transistors are controlled by gate voltage magnitude and unbalanced voltage differentials are converted into unbalanced current differentials of buffer currents. The gate voltage magnitude compensation equalization method and circuit relates to differential control and works in a dynamic voltage change process of the series-connected power switch transistors, without having a negative effect on operation of the power switch transistors under normal operating conditions.Type: ApplicationFiled: June 1, 2020Publication date: December 23, 2021Applicant: Zhejiang UniversityInventors: Wuhua LI, Chengmin LI, Saizhen CHEN, Haoze LUO, Xin XIANG, Chushan LI, Xiangning HE
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Publication number: 20210381875Abstract: The present invention relates to a device and method for measuring the amount of a liquid chemical in a plant protection unmanned aerial vehicle (UAV). An ultrasonic sensor is adopted to measure a distance between a liquid chemical level in a liquid chemical measuring tube communicated with a liquid chemical tank and a top end of the liquid chemical measuring tube, and then a height of the liquid chemical in the liquid chemical tank is further determined according to an acquired attitude angle of the UAV and a distance between a central position of the liquid chemical measuring tube and a central position of the liquid chemical tank, thereby accurately measuring the amount of the liquid chemical in the liquid chemical tank of the UAV.Type: ApplicationFiled: July 20, 2020Publication date: December 9, 2021Applicant: Zhejiang UniversityInventors: Yong HE, Jiangpeng ZHU, Liwen HE
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Publication number: 20210382134Abstract: In a general aspect, a target is localized based on measurements from a measurement device array. In some aspects, range difference values (di) and coordinate vectors (ai) of devices in the measurement device array are obtained. The range difference values are generated based on time difference of arrival measurements of wireless signals between the target device and each of the devices in the measurement device array. A first matrix (A) and a first vector (b) are constructed. The first matrix (A) and the first vector (b) each includes the range difference values and the coordinate vectors. Whether a second vector (y) satisfies a condition set is determined. The condition set includes a first condition (ATA+?D)y=ATb and a second condition vT (ATA+?D)v?0. A numerical approximation of an optimal solution of the second vector is generated.Type: ApplicationFiled: June 3, 2020Publication date: December 9, 2021Applicant: Zhejiang UniversityInventors: Junfeng Wu, Jiming Chen, Jieqiang Wei, Guangyang Zeng
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Publication number: 20210376858Abstract: The present disclosure provides a method for optimizing a protograph-based LDPC code over an underwater acoustic (UAW) channel. The traditional protograph-based LDPC code over an UAW channel does not consider performance in an error floor region. The method first determines parameters such as a protograph-based LDPC code length, a basic protograph, a target decoding threshold, a threshold adjustment factor, and an ACE check parameter. The protograph is optimized, and the method constructs a parity check matrix by using a UAW channel-based PEG/ACE hybrid algorithm, performs ACE check on the parity check matrix, and calculates a decoding threshold for the matrix passing the check. If the decoding threshold is within a range of an iterative decoding threshold, the parity check matrix is a final optimized matrix. Otherwise, the method continues to optimize the protograph until a parity check matrix passing the check is obtained.Type: ApplicationFiled: June 2, 2021Publication date: December 2, 2021Applicant: Zhejiang UniversityInventors: Lei XIE, Huifang Chen, Hongda Duan
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Patent number: 11186809Abstract: A high-concentration anaerobic fermentation apparatus includes a liquid accumulation tank, a fermentation vessel, a feeding assembly, and a biogas residue collecting bin. The feeding assembly includes a hopper and a return conveyor belt including a first portion extending downward from the hopper till below a liquid level, a second portion extending upward from a bottom end of the first portion till above the liquid level, a third portion extending downward from a top end of the second portion till the liquid level, and a fourth portion extending upward from a bottom end of the third portion till out of the liquid level and above the biogas residue collecting bin. A pressure-feed flange is disposed at an outer side of the fermentation vessel, a feed channel is formed between the pressure-feed flange and the first portion, and a discharge channel is formed between the pressure-feed flange and the fourth portion.Type: GrantFiled: October 16, 2020Date of Patent: November 30, 2021Assignee: Zhejiang University of Science and TechnologyInventors: Shengdao Shan, Tianyong Xiang, Jingming Li, Ping Zheng, Huicai Cheng, Wu Huang, Zhirong Wang, Baolan Hu, Changai Zhang
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Publication number: 20210365607Abstract: A photon confinement theoretical model is proposed, and a solar cell structure model is designed based on the theoretical model, thereby providing a photonically-confined solar cell and optoelectronic device to effectively reduce the probability of photons escaping from the cell.Type: ApplicationFiled: May 18, 2021Publication date: November 25, 2021Applicant: Zhejiang UniversityInventors: Dawei DI, Yaxiao LIAN, Qian ZHOU, Baodan ZHAO
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Patent number: 11180440Abstract: The present disclosure relates to a method for preparing isophorone diamine by means of a hydrogenation reduction of isophorone nitrile imine. The hydrogenation reduction is continuously carried out in a multi-stage bubble column reactor loaded with a supported alkaline cobalt-based catalyst, wherein isophorone nitrile imine is successively in countercurrent contact with hydrogen in each stage of the reactor to carry out a hydrogenation reduction reaction, so as to obtain the isophorone diamine. The preparation method solves the problem of back-mixing, and further improves the conversion rate and the cis/trans ratio of the product.Type: GrantFiled: November 30, 2018Date of Patent: November 23, 2021Assignees: Zhejiang Nhu Company Ltd., Zhejiang University, Shandong Nhu Amino Acid Co., Ltd., Shandong Nhu Fine Chemical Science and Technology Company Ltd.Inventors: Zhirong Chen, Jianyong Mao, Baishan Hu, Guanbing Li, Haoran Li, Yu Wang, Yingkuo Yang, Qing Liu, Jiyu Tang, Weiyong Chen
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Patent number: 11162040Abstract: The present invention relates to a method for preparing low-sulfur biodiesel.Type: GrantFiled: December 28, 2018Date of Patent: November 2, 2021Assignee: Zhejiang University of TechnologyInventors: Yong Nie, Fan Xia, Qinglong Xie, Meizhen Lu, Xiaojiang Liang, Yanbin Su, Jianbing Ji
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Publication number: 20210310174Abstract: Disclosed is an integrated washing and spinning tub and an energy-saving and healthy household washing machine with a tub replacing function. The integrated washing and spinning tub comprises a water holding tub, a spinning tub is arranged in the water holding tub, and the water holding tub and the spinning tub are connected in a sliding groove mode. The energy-saving and healthy household washing machine with a tub replacing function comprises a washing machine shell, the integrated washing and spinning tub is arranged in the washing machine shell, a spring telescopic support corresponding to the integrated washing and spinning tub is arranged on the inner wall of the upper portion of the washing machine shell, a support frame is arranged at the bottom of the integrated washing and spinning tub, and a reduction gear and a motor which are connected are arranged on the support frame.Type: ApplicationFiled: March 31, 2021Publication date: October 7, 2021Applicant: Zhejiang UniversityInventors: De DING, Junxiang YU, Yiqun JIN
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Patent number: 11094907Abstract: The present application provides a single photon source device, a preparation method thereof, and applications of the same. The single photon source device includes a first electrode layer, a first carrier transport layer, a quantum dot light-emitting layer, a second carrier transport layer and a second electrode layer which are stacked in sequence, and the quantum dot light-emitting layer comprises an insulating material and quantum dots dispersed in the insulating material, neighbor distance of at least a part of the quantum dots is greater than or equal to the central wavelength of the luminescent spectrum of quantum dots.Type: GrantFiled: August 2, 2018Date of Patent: August 17, 2021Assignees: Zhejiang University, Najing Technology Corporation LimitedInventors: Wei Fang, Xiaogang Peng, Yizheng Jin, Xing Lin, Xingliang Dai, Chaodan Pu
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Patent number: 11085161Abstract: A device and a method for treating soft soil foundations, the device comprises: a drainage plate (4), a water collection well (7), and a pressurizing drainage pipe (6), the pressurizing drainage pipe (6) is connected to the bottom of the drainage plate and the bottom of the water collection well through pipelines; a pressurizing module comprises: film (12), the film (12) is impermeable and covers the soft soil foundation; a pile-loading body (13), the pile-loading body (13) is arranged on the film; air compressor (1) has a pressurizing end with a space below the film to make a soil layer of the soft soil foundation below the film under an air pressure higher than the atmospheric pressure, so that the underground water discharge process can be started.Type: GrantFiled: May 11, 2020Date of Patent: August 10, 2021Assignee: Zhejiang UniversityInventors: Hongyue Sun, Yuequan Shang
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Patent number: 11084013Abstract: A metal-free catalytic oxidation system, an oxygenation method and a method for producing benzoic acid derivatives. The system includes a feed device; a tubular reactor; a plurality of venturi nozzles mounted on the tubular reactor at intervals; a tubular filter; a discharge device for a solid phase product; and an intermediate tank for reaction mixture. A low-pressure zone is formed at an output end of each of the plurality of venturi nozzles, and an oxygen inlet corresponds to the low-pressure zone; the tubular filter comprises an inner tube and an outer tube connected to each other, where the inner tube is provided with small holes for solid-liquid separation; the discharge device for the solid phase product is located at an end of the inner tube; and the intermediate tank for reaction mixture is connected to the outer tube of the tubular filter through a pipeline.Type: GrantFiled: December 14, 2020Date of Patent: August 10, 2021Assignee: Zhejiang University of TechnologyInventor: Jianhong Jia
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Publication number: 20210240446Abstract: The present disclosure provides a method for identifying a carrier motion mode based on a time-domain differential characteristic. Firstly, a difference operation is performed on data to obtain a difference sequence, and then sign, progressive multiplication, and accumulation operations are performed on the difference sequence, and finally thresholds are set to determine an accumulation sequence, so as to obtain a carrier motion mode. All operations involved in this method are performed in time domain, and the method has the advantages of simple algorithm, good real-time performance, accurate determination, and strong robustness.Type: ApplicationFiled: January 15, 2021Publication date: August 5, 2021Applicant: Zhejiang UniversityInventors: Lijun MIAO, Jingtao YAN, Yilan ZHOU, Tengchao HUANG, Shuangliang CHE, Xiaowu SHU
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Publication number: 20210223316Abstract: Disclosed is a chip for detection of basic electric leakage on a residual current protector. Basic electric leakage can be understood as an electric leakage signal which is generated during normal operation of an electrical appliance and cannot cause a residual current protector to trip out. The chip for detection of basic electric leakage includes a peak detection circuit, a 20 ms clock generator, a 60 ms delay circuit, a 2.5 V reference voltage module, a register module, a comparator module, a counter, a digital subtracter, an analog-to-digital converter (ADC) module, a digital-to-analog converter (DAC) module, an analog adder/analog subtracter, a selection circuit, and a circuit for delayed resetting. The present disclosure can identify and eliminate a basic electric leakage signal from an input electric leakage signal, and will not affect normal operation of a load during detection, determination, storage, and output of the electric leakage signal.Type: ApplicationFiled: January 20, 2021Publication date: July 22, 2021Applicant: Zhejiang UniversityInventors: Jiangcheng Luo, Yan Han
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Patent number: 11047680Abstract: A multi-node data synchronous acquisition system and a method for real-time monitoring of underwater surface deformation. The system includes at least four sensor arrays, where each of the sensor array consists of a plurality of ribbon-like rigid substrates connected by movable joints. On each section of rigid substrate, three sensor units are respectively connected to a slave station data acquisition unit through cables. The slave station data acquisition unit is connected with a central controller through a cable. The central controller includes a compressive cabin outside and an embedded controller and a power supply inside. Each slave station data acquisition unit acquires data from an MEMS attitude sensor and then transmits it to the embedded controller. The present invention may realize synchronous acquisition of underwater or even underwater multi-node data, implement three-dimensional surface reconstruction, and may be used for improving the ocean observation capability.Type: GrantFiled: April 24, 2019Date of Patent: June 29, 2021Assignee: Zhejiang UniversityInventors: Jiawang Chen, Huangchao Zhu, Chunying Xu, Chen Cao, Zhou Yu, Jun Han, Yuan Lin
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Patent number: 11029237Abstract: A sediment pressure-holding transfer device developed based on abyssal sediment fidelity sampler is disclosed, which uses a vacuum pump to discharge a gas in the device, uses a high-pressure pump as a power source to perform a pressurization process, uses gravity of a sample to perform a first transfer, and uses a high-pressure impurity pump and a safety valve to perform a second transfer of a sample mixture, in its structure, a high-pressure-resistant and corrosion-resistant material is used as a main material of the device, the device mainly comprises a mechanical system and a hydraulic system, the mechanical system is used as a main frame of the device and is a basis for ensuring operation of the device; the hydraulic system is used as a core of the device and is a key to ensure success of sediment transfer.Type: GrantFiled: May 9, 2019Date of Patent: June 8, 2021Assignee: Zhejiang UniversityInventors: Jiawang Chen, Jing Xiao, Jiasong Fang, Weitao He, Hao Wang, Yue Huang, Wei Wang, Yuxia Sun
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Publication number: 20210139361Abstract: A device and method for mud solidification based on electro-osmosis well points cooperating with well-points dewatering. The method includes the following steps: 1) preparation; 2) construction of well point pipe positioning frame beams; 3) assembly of a mobile trestle platform; 4) well point pipe arrangement; 5) well point/electro-osmosis dewatering; 6) filtrate treatment; 7) well point pipe dismantling; and 8) excavation and transportation of solidified drilling slag for utilization. According to the disclosure, well point pipes are adopted and used as an anode and a cathode of an electro-osmosis well, and on-site quick solidification of pile foundation mud is implemented through the electro-osmosis combined with light well-points dewatering; by the adoption of the well point pipe positioning frame beams, the problems that drilling slag in a sedimentation tank has a large water content and it is difficult to arrange and fix the well point pipes are well solved.Type: ApplicationFiled: November 12, 2020Publication date: May 13, 2021Applicants: Shaoxing University, Zhejiang University City CollegeInventors: Yunjin HU, Feng CHEN, Jiqing JIANG, Lianying ZHOU, Lu SHI
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Publication number: 20210115339Abstract: A device for pyrolysis reactions includes a feeding pump, a flow meter, an atomizer, a pyrolysis reactor, electromagnetic coils, an electromagnetic induction heating power, a temperature sensor, a temperature controller, a condenser and a product tank. The feeding pump is connected with the flow meter which is connected to the inlet of the atomizer in the pyrolysis reactor. There is a port at the bottom of the pyrolysis reactor, with the port at the top of the pyrolysis reactor connected with the condenser. The condenser is connected with the product tank. The external wall of the pyrolysis reactor is surrounded by electromagnetic coils which are connected with the electromagnetic induction heating power. The temperature sensor is placed between the pyrolysis reactor and the coils, which is connected with the temperature controller. The contact resistance between the atomized material and the hot surface can be.Type: ApplicationFiled: December 28, 2018Publication date: April 22, 2021Applicant: Zhejiang University of TechnologyInventors: Yong NIE, Qinglong XIE, Ying DUAN, Fan XIA, Meizhen LU, Shangzhi YU, Xiaojiang LIANG, Jianbing JI