Patents Assigned to Tianjin University
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Publication number: 20210355457Abstract: The present disclosure provides recombinant Pichia pastoris, a construction method thereof, and use thereof in the efficient preparation of 15?-D-ethylgonendione, and belongs to the technical field of fermentation engineering. In the present disclosure, with Pichia pastoris as a host, 15?-steroid hydroxylase and glucose-6-phosphate dehydrogenase (G6PD) are simultaneously induced in a manner of intracellular enzyme production for the first time, and the Pichia pastoris whole-cell induction and catalysis mode is used to achieve the conversion of D-ethylgonendione with high substrate loading and high conversion rate.Type: ApplicationFiled: May 12, 2021Publication date: November 18, 2021Applicant: Tianjin University of Science and TechnologyInventors: Xiaoguang Liu, Fuping Lu, Shuhong Mao, Peng Jin, Dongqi Xie, Yanxi Chen, Jinhong Li
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Patent number: 11167991Abstract: Provided is a method for preparing a carbon nanotube/polymer composite material, including: coating a nano-silicon oxide film on the surface of a porous polymer by vacuum coating; depositing a metal catalyst nano-film on the nano-silicon oxide film by vacuum sputtering; growing a carbon nanotube array in situ on the surface of the porous polymer by plasma enhanced chemical vapor deposition to obtain a carbon nanotube/polymer porous material; and impregnating the carbon nanotube/polymer porous material with a polymer and curing to obtain the carbon nanotube/polymer composite material. By using a heat-resistant polymer having a high heat-resistant temperature and a PECVD technique, a carbon nanotube array directly grows in situ on the surface of a polymer at a low temperature, which thereby overcomes the defects of the composites previously prepared, in which carbon nanotubes are difficult to be homogeneously dispersed and the interfacial bonding force in the composites is weak.Type: GrantFiled: September 6, 2018Date of Patent: November 9, 2021Assignee: Tianjin UniversityInventors: Wei Feng, Fei Zhang, Yiyu Feng, Mengmeng Qin
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Publication number: 20210333181Abstract: The present invention discloses a method for detecting the mechanical response of a mechanical component by an organic mechanoresponsive fluorescent material, comprising the following steps of: selecting an organic mechanoresponsive fluorescent material; preparing an organic mechanoresponsive fluorescent material solution; forming a film on a metal surface; calibrating fluorescence intensity and obtaining the fluorescence intensity and distribution in a crack tip area; observing the fluorescence signal generated at cracks to monitor the occurrence of fatigue cracks, and predict a propagation pathway of fatigue cracks by using the fluorescence intensity distribution in the crack tip area.Type: ApplicationFiled: April 26, 2018Publication date: October 28, 2021Applicants: Tianjin University, The Hong Kong University of Science and TechnologyInventors: Zhe ZHANG, Benzhong TANG, Xu CHEN, Zijie QIU, Weijun ZHAO
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Publication number: 20210332302Abstract: The present invention a mixed fuel suitable for diesel engines, which consists of the following components by volume percentage: 35% to 37.5% of diesel, 35% to 37.5% of ethanol and 25% to 30% of PODE, wherein the diesel is petroleum diesel having a cetane number not less than 48; the purity of the ethanol by mass percentage is not less than 99.5%; and, the PODE is a mixture of two fuels shown by molecular formulae CH3O(CH2O)3CH3 and CH3O(CH2O)4CH3. The use of this fuel is advantageous for emission reduction.Type: ApplicationFiled: March 28, 2018Publication date: October 28, 2021Applicant: Tianjin UniversityInventors: Haifeng LIU, Guixiang MA, Junsheng MA, Mingfa YAO, Zunqing ZHENG, Hu WANG
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Publication number: 20210324926Abstract: The present invention discloses an electromagnetic braking system and control method, the system comprises a CCU, a braking cylinder, a push rod, an electromagnetic braking ring, an electromagnetic braking piston fixed to the push rod, a first shading plate and a second shading plate, a photoelectric sensor fixed near the push rod, and an electromagnetic braking control circuit. The control method includes following steps: initial estimating the braking distance l according to the current magnitude, electromagnetic force between the two electromagnetic coils and initial velocity v of the push rod, arranging a restoration distance ?l between the top dead center and the piston after braking, installing two shading plates and the photoelectric sensor; setting the distance between the two electromagnetic coils to L=l+?l when starting the braking.Type: ApplicationFiled: March 8, 2019Publication date: October 21, 2021Applicant: Tianjin UniversityInventors: Jiaying PAN, Lei WANG, Haiqiao WEI, Gequn SHU, Changwen LIU, Guobin MA
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Publication number: 20210322954Abstract: The present disclosure relates to the field of the catalytic technologies, and provides a p-type TiO2/n-type WO3 heterojunction catalyst and its preparation and use in photochemical synthesis of fuels. The catalyst comprises p-type TiO2 and n-type WO3 supported on a surface of the p-type TiO2. The disclosure proposes to support n-type WO3 onto a surface of p-type TiO2. The catalyst has high catalytic efficiency, and is particularly suitable for use in photocatalytic processes for synthesizing fuels.Type: ApplicationFiled: October 1, 2020Publication date: October 21, 2021Applicant: Tianjin UniversityInventors: Lun Pan, Jijun Zou, Ying Chen, Xiangwen Zhang, Li Wang
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Publication number: 20210322956Abstract: The present application discloses a supported PtZn intermetallic alloy catalyst, a method for preparing the same and application thereof. The catalyst uses SiO2 as a support and Zn as a promoter, and a small amount of active component Pt is supported; the weight percentage of Pt is 0.025%-1%, and the weight percentage of Zn is 0.025%-1.7%, a co-impregnation method is adopted in preparation, the SiO2 support is impregnated in aqueous solution of chloroplatinic acid and zinc nitrate, and then drying and high-temperature reduction are performed to obtain a PtZn/SiO2 catalyst. The catalyst has the advantages of high activity, high stability, low price and low toxicity. The catalyst provided by the present application is applicable to preparation of alkene through short-chain alkane dehydrogenation, in particular to preparation of propylene through propane dehydrogenation in a hydrogen atmosphere.Type: ApplicationFiled: November 21, 2019Publication date: October 21, 2021Applicant: Tianjin UniversityInventors: Jinlong GONG, Sai CHEN, Liang ZENG
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Patent number: 11143091Abstract: An efficient engine combustion system with multiple combustion modes, includes a valve actuating mechanism, a pre-combustion chamber, and a main combustion chamber. The valve actuating mechanism is a fully variable valve mechanism; an intake valve and an exhaust valve are driven by high-pressure oil; ignition is implemented by means of an ignition apparatus of the pre-combustion chamber; and a spark plug and a single-hole fuel injector are mounted in the pre-combustion chamber, a bottom end of which is provided with a flame jet hole. The continuous variable of valve timing and real-time adjustment of valve lift are realized by the control of a three-position four-way servo valve, driven by the high-pressure oil and monitored by a displacement sensor. The efficient engine combustion system with multiple combustion modes employs different combustion modes under different engine conditions, so as to ensure optimal thermal efficiency under different operating condition regions.Type: GrantFiled: March 29, 2019Date of Patent: October 12, 2021Assignee: Tianjin UniversityInventors: Haiqiao Wei, Jianxiong Hua, Dengquan Feng, Lei Zhou, Kai Dong
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Patent number: 11124780Abstract: The present disclosure relates to a genetically engineered strain with high production of uridine and its construction method and application. The strain was constructed as follows: heterologously expressing pyrimidine nucleoside operon sequence pyrBCAKDFE (SEQ ID NO:1) on the genome of E coli prompted by strong promoter Ptrc to reconstruct the pathway of uridine synthesis; overexpressing the autologous prsA gene coding PRPP synthase by integration of another copy of prsA gene promoted by strong promoter Ptrc on the genome; deficiency of uridine kinase, uridine phosphorylase, ribonucleoside hydrolase, homoserine dehydrogenase I and ornithine carbamoyltransferase. When the bacteria was used for producing uridine, 40-67 g/L uridine could be obtained in a 5 L fermentor after fermentation for 40-70 h using the technical scheme provided by the disclosure with the maximum productivity of 0.15-0.25 g uridine/g glucose and 1.Type: GrantFiled: May 12, 2019Date of Patent: September 21, 2021Assignee: Tianjin University of Science and TechnologyInventors: Xixian Xie, Ning Chen, Heyun Wu, Guoliang Li, Qiang Li, Xiaoguang Fan, Qingyang Xu, Chenglin Zhang, Yanjun Li, Qian Ma
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Patent number: 11121539Abstract: The present invention discloses a DC solid-state circuit breaker with self-adapt fault current limiting capability. The topology of the DC solid-state circuit breaker is a H-bridge circuit consisting of two unidirectional breakable bridge arms and two series-connected diode bridge arms, wherein the two unidirectional breakable bridge arms are connected in series to the two series-connected diode bridge arms in a same direction to form two series branches, respectively; the series branches are connected in parallel; a series branch formed by a DC reactor L and a DC biased power supply is connected to the PCC between the two unidirectional breakable bridge arms and the PCC between the two series-connected diode bridge arms; the DC line is connected to the two PCCs, respectively.Type: GrantFiled: June 22, 2017Date of Patent: September 14, 2021Assignee: Tianjin UniversityInventors: Bin Li, Jiawei He
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Publication number: 20210277842Abstract: The present invention discloses a cold start operation device and control method for a diesel engine in a plateau region under a low ambient temperature, allowing a starter to drive a piston to compress the low-temperature air, by using the heated air as the fresh inlet air to introduce it into the cylinder, so that the in-cylinder temperature at the compressing TDC is increased to obtain the ignition temperature, and finally achieving the cold start of diesel engines in plateau regions. The present invention avoids complicated preheating devices, and has simple structure and reliable performance, can achieve effective cold start in different low ambient temperature environments.Type: ApplicationFiled: March 29, 2018Publication date: September 9, 2021Applicant: Tianjin UniversityInventors: Haifeng LIU, Junsheng MA, Guixiang MA, Zihan HE, Mingfa YAO, Zunqing ZHENG, Hu WANG
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Patent number: 11112270Abstract: The present invention discloses an attitude self-compensation method to the transmitters of wMPS based on inclinometer, including the following steps: step 1: arranging inclinometer-combined transmitters according to the mechanism structure of the transmitters; step 2: building a horizontal reference frame based on an automatic level and guide rail; step 3: calibrating rotation relationship between the inclinometer and transmitter coordinate systems by referring to the horizontal reference frame according to the measurement model of the inclinometer and rotation measurement model of the transmitter; step 4: updating the orientation parameters of the transmitters in real time according to the output values of the inclinometer and compensation algorithm for the orientation parameters. The method of the present invention aims at self-compensating the orientation parameters of transmitters in real time and increasing the stability of the system.Type: GrantFiled: December 25, 2017Date of Patent: September 7, 2021Assignee: Tianjin UniversityInventors: Jiarui Lin, Jigui Zhu, Yongjie Ren, Linghui Yang, Siyang Guo
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Patent number: 11111864Abstract: The present disclosure discloses an intake oxygen concentration control system suitable for an engine with lean NOx trapping technology. The system adopts an exhaust turbocharging device to provide a pressure difference for an oxygen-enriched membrane to generate oxygen-rich and oxygen-deficient gases, and controls the intake oxygen concentration of different cylinders by adjusting the opening of flow control valves to match lean and rich combustion cycles of a lean NOx trapping system. In a lean combustion cycle, all four cylinders are filled with an oxygen-rich gas, which can make the combustion more complete and improve the thermal efficiency and fuel economy.Type: GrantFiled: October 23, 2020Date of Patent: September 7, 2021Assignee: Tianjin UniversityInventors: Haifeng Liu, Can Wang, Mingchao Liu, Mingfa Yao, Zunqing Zheng, Hu Wang
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Publication number: 20210223153Abstract: The invention discloses a method for obtaining the geometrical and mechanical parameters of rock samples and a holographic scanning system thereof, wherein the system includes an observation mechanism, a multi-scale penetration mechanism, a grinding mechanism, a rock sample installation mechanism arranged on a three-axis precision motion platform, and an industrial computer controlling the operation mode of each mechanism of the platform Indentation/rotary penetration test, pulse echo signal acquisition, three-dimensional surface topography reconstruction, layer by layer grinding and repeated experiments are carried out. The geometric parameters and corresponding mechanical field parameters are obtained by spatial interpolation of the three-dimensional parameter lattice accumulated by several layers of single-layer rock parameters. The holographic scanning system and method can obtain the real spatial distribution of various media in rock samples.Type: ApplicationFiled: January 15, 2021Publication date: July 22, 2021Applicant: Tianjin UniversityInventors: Gaofeng ZHAO, Yiming LI
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Publication number: 20210226439Abstract: The present invention discloses a DC solid-state circuit breaker with self-adapt fault current limiting capability. The topology of the DC solid-state circuit breaker is a H-bridge circuit consisting of two unidirectional breakable bridge arms and two series-connected diode bridge arms, wherein the two unidirectional breakable bridge arms are connected in series to the two series-connected diode bridge arms in a same direction to form two series branches, respectively; the series branches are connected in parallel; a series branch formed by a DC reactor L and a DC biased power supply is connected to the PCC between the two unidirectional breakable bridge arms and the PCC between the two series-connected diode bridge arms; the DC line is connected to the two PCCs, respectively.Type: ApplicationFiled: June 22, 2017Publication date: July 22, 2021Applicant: Tianjin UniversityInventors: Bin LI, Jiawei HE
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Publication number: 20210214380Abstract: A crystalline form of phenyl bis (2,4,6-trimethylbenzoyl) phosphine oxide, with a large particle size, which belongs to a triclinic crystal system and space group P-1. A crystallization method for making the crystalline form of phenyl bis (2,4,6-trimethylbenzoyl) phosphine oxide, comprising adding a solid of phenyl bis (2,4,6-trimethylbenzoyl) phosphine oxide to a solvent and mixing; followed by heating to 50 to 70° C. to achieve complete dissolution; cooling the solution to room temperature; and adding an anti-solvent to the resulting solution to cause precipitation of crystals. The crystals are allowed to grow at a constant temperature for 10 to 60 minutes, so as to give a slurry containing the crystals. Said slurry is subjected to filtration and then drying to obtain the crystalline form of phenyl bis (2,4,6-trimethylbenzoyl) phosphine oxide.Type: ApplicationFiled: January 8, 2021Publication date: July 15, 2021Applicant: Tianjin UniversityInventors: Ying BAO, Pei Zhao, Mingshuo Chen, Baohong Hou, Chuang Xie, Lina Zhou
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Publication number: 20210214509Abstract: A lignocellulose nanofibril material, a stable foam system based thereon, a preparation method and an application thereof are provided. The lignocellulosic nanofibril material includes the following components: 0.5-20 wt % of wood flour, 0.1-10 wt % of (2,2,6,6-tetramethylpiperidin-1-yl)oxidanyl, 2-25 mmol/g of an oxidant, 6-15 wt % of NaBr, and the remaining is water. The stable foam system based on the lignocellulosic nanofibril material includes: 0.1-1.0 wt % of the lignocellulosic nanofibril material, 0.2-1.0 wt % of a surfactant, 0.1-10 wt % of sodium chloride, 0.1-1.0 wt % of calcium chloride, 0.1-1.0 wt % of magnesium chloride, 0.1-1.0 wt % of sodium sulfate, and a balance of water.Type: ApplicationFiled: April 15, 2019Publication date: July 15, 2021Applicants: Southwest Petroleum University, Tianjin University of Science and TechnologyInventors: Bing WEI, Yangbing WEN, Yuanyuan WANG, Wanfen PU, Shengen CHEN
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Publication number: 20210203227Abstract: The present invention discloses a modular multilevel dynamic switching DC-DC transformer, which consists of N DC-DC sub-modules connected in series. Each of the DC-DC sub-modules is of a symmetrical structure capable of realizing bidirectional power flow, which consists of two half-bridge sub-modules and isolating switches S1, S2 between capacitors C1, C2 of the two half-bridge sub-modules. The capacitors C1, C2 are disposed in parallel between the half-bridge sub-modules and the isolating switches. Assuming that the power flows in the primary side of the DC-DC transformer and flows out from the secondary side; the half-bridge sub-module located on the primary side of the DC-DC transformer is referred to as a primary-side sub-module; and, the half-bridge sub-module located on the secondary side of the DC-DC transformer is referred to as a secondary-side sub-modules.Type: ApplicationFiled: January 29, 2018Publication date: July 1, 2021Applicant: Tianjin UniversityInventors: Bin LI, Weixin ZHANG
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Publication number: 20210198679Abstract: A Saccharomyces cerevisiae strain with high yield of ethyl butyrate and a construction method and an application thereof are provided. The strain is obtained by over-expressing in the starting strain acetyl coenzyme A acyl transferase gene Erg10, 3-hydroxybutyryl coenzyme A dehydrogenase gene Hbd, 3-hydroxybutyryl coenzyme A dehydratase gene Crt, trans-2-enoyl coenzyme A reductase gene Ter, and alcohol acyl transferase gene AAT. Compared to the starting bacteria not producing ethyl butyrate, the yield of ethyl butyrate of the constructed strain reaches 77.33±3.79 mg/L, the yield of the ethyl butyrate of the strain with double copy expression of gene Ter and gene AAT reaches 99.65±7.32 mg/L, increased by 28.9% compared with the EST strain, and 40.93±3.18 mg/L of ethyl crotonate is unexpectedly produced.Type: ApplicationFiled: December 25, 2020Publication date: July 1, 2021Applicant: Tianjin University of Science and TechnologyInventors: Yefu CHEN, Yanrui MA, Yongjing DU, Sen JIANG, Jinying REN, Guo ZHANG, Xinyue KANG, Peng ZHENG, Xiaole WU, Dongguang XIAO, Xuewu GUO
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Patent number: 11050961Abstract: The present invention relates to technical field of analog integrated circuit design. TDI function is better realized by CMOS image sensor and it improves scanning frequency of the CMOS-TDI image sensor and extends application range of TDI technique. To this end, the present invention proposes a technical solution of high scanning frequency CMOS-TDI image sensor. The pixels include a photodiode, an operational amplifier, integration capacitors C1 and C2 of the same capacitance, an offset voltage removing capacitor C3, and plural switches S1-S10. The anode of the photodiode is connected to a zero voltage ground wire, while the cathode thereof is connected to one end of the switch S9. The other end of the switch S9 is connected to a reference voltage Vref. The above pixels are cascaded and an output end of the last pixel is connected to a column-parallel ADC through a readout switch Read. The invention mainly applies to analog integration circuit design.Type: GrantFiled: December 12, 2014Date of Patent: June 29, 2021Assignee: Tianjin UniversityInventors: Kaiming Nie, Suying Yao, Jiangtao Xu, Zhiyuan Gao, Zaifeng Shi, Jing Gao