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Bo Zhao,Fan Chen,Xiao-feng Jia,Chong-yang Zhao,Xiao-bo Wang 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.4
Ultrasonic vibration-assisted Electrolytic in-process dressing (ELID) grinding is a highly efficient and highly precise machining method. The surface quality prediction model in ultrasonic vibration-assisted ELID mirror grinding was studied. First, the interaction between grits and workpiece surface was analyzed according to kinematic mechanics, and the surface roughness model was developed. The variations in surface roughness under different parameters was subsequently calculated and analyzed by MATLAB. Results indicate that compared with the ordinary ELID grinding, ultrasonic vibration-assisted ELID grinding is superior, because it has more stable and better surface quality and has an improved range of ductile machining.
( Bo Wen Liu ),( Shang Feng Liu ),( Shan He ),( Ying Zhao ),( Hong Xia Hu ),( Zhao Wang ) 생화학분자생물학회 2005 BMB Reports Vol.38 No.2
Gonadogenesis is a complicated process which involves multi-gene interactions. A rainbow trout (Oncorhynchus mykiss) gene spermatogenesis associated 4 (SPATA4) was cloned and characterized from adult rainbow trout testis. The cDNA sequence of rainbow trout SPATA4 contains an open reading frame of 1, 081 nucleatides encoding a putative protein of 259 amino acids. The putative protein from rainbow trout shares a 76.8% homology with zebrafish SPATA4. No trans-membrane regions or signal peptide were detected using bioinformatics methods. Subcellular localization analysis revealed that rainbow trout SPATA4 was a nuclear protein with highest possibility (39.1%). Multi-tissue reverse transcriptase PCR (RT-PCR) was performed to examine the distribution of rainbow trout SPATA4 in eleven organs of adult rainbow trout. The result demonstrated that this gene express specifically in testis and slight amount of expression was detected in ovary. Further analysis of SPATA4 characterization and function in rainbow trout may provide insight into the understanding of gonadogenesis process.
Thermal Conductive Epoxy Enhanced by Nanodiamond-Coated Carbon Nanotubes
Bo Zhao,Guohua Jiang 대한금속·재료학회 2017 ELECTRONIC MATERIALS LETTERS Vol.13 No.6
Nanodiamond (ND) particles were coated on the surface of carbonnanotubes (CNTs) by chemical reactions. Reliable bonding wasformed by the combination of acyl chloride on NDs and amine groupon CNTs. ND coated CNTs (CNT-ND) were dispersed into epoxy tofabricate thermal conductive resins. The results show that the surfaceenergy of CNTs is decreased by the coated NDs, which is contributedto the excellent dispersion of CNT-NDs in the epoxy matrix. Theheat-transfer channels were built by the venous CNTs cooperatingwith the coated NDs, which not only plays an effective role of heatconduction for CNTs and NDs, but also avoids the electrical leakageby the protection of NDs surrounding outside of CNTs. Electrical andthermal conductance measurements demonstrate that the influence ofthe CNT-ND incorporation on the electrical conductance is minor,however, the thermal conductivity is improved significantly for theepoxy filled with CNT-ND.
Bo Zhao,Yuanchun Li 제어·로봇·시스템학회 2018 International Journal of Control, Automation, and Vol.16 No.2
In this paper, a model-free near-optimal decentralized tracking control (DTC) scheme is developed for reconfigurable manipulators via adaptive dynamic programming algorithm. The proposed controller can be divided into two parts, namely local desired controller and local tracking error controller. In order to remove the normboundedness assumption of interconnections, desired states of coupled subsystems are employed to substitute their actual states. Using the local input/output data, the unknown subsystem dynamics of reconfigurable manipulators can be identified by constructing local neural network (NN) identifiers. With the help of the identified dynamics, the local desired control can be derived directly with corresponding desired states. Then, for tracking error subsystems, the local tracking error control is investigated by the approximate improved local cost function via local critic NN and the identified input gain matrix. To overcome the overall error caused by the substitution, identification and critic NN approximation, a robust compensation is added to construct the improved local cost function that reflects the overall error, regulation and control simultaneously. Therefore, the closed-loop tracking system can be guaranteed to be asymptotically stable via Lyapunov stability theorem. Two 2-degree of freedom reconfigurable manipulators with different configurations are employed to demonstrate the effectiveness of the proposed modelfree near-optimal DTC scheme.
The design and fabrication of 81.25 MHz RFQ for Low Energy Accelerator Facility
Bo Zhao,Shuping Chen,Tieming Zhu,Fengfeng Wang,Xiaofeng Jin,Chenxing Li,Wei Ma,Bin Zhang 한국원자력학회 2019 Nuclear Engineering and Technology Vol.51 No.2
To provide high shunt impendence with low power losses, an 81.25 MHz continuous wave (CW) radiofrequency quadrupole (RFQ) accelerator has been designed and machined as parts of the Low EnergyAccelerator Facility (LEAF). In this paper, the mechanical structure and the main processing technology ofthe RFQ cavities are described according to the physical and geometric parameters requirements of theRFQ. The fabrication of the RFQ has been completed and the test results agree well with the designrequirements. The RFQ accelerator will work in Institute of Modern Physics, Chinese Academy of Sciencesin 2018.
Decrease of Contact Resistance at the Interface of Carbon Nanotube/Electrode by Nanowelding
Bo Zhao,Yanfang Wang,Yafei Zhang 대한금속·재료학회 2017 ELECTRONIC MATERIALS LETTERS Vol.13 No.2
Reliable interconnection between carbon nanotubes (CNTs) and externalcircuit is one of the prerequisite in CNT electronics. In this work,ultrasonic nanowelding was used to bond CNTs with metal electrodes. Byexerting ultrasonic energy at the interface of CNT/electrode, a reliable jointwith negligible contact resistance was obtained between CNTs andelectrodes. The performance of welding is susceptible to the ultrasonicparameters such as ultrasonic power and clamping force, as well as themetal type. It is found that the metals with good ductility or low meltingpoint are easier to achieve effective joints. Moreover, interfacialcompounds are formed at the welded surface of metal Al and Fe, which isresulted from the interacting and chemical bonding of carbon and metalatoms. After nanowelding, the contact resistance between CNTs andelectrode is decreased dramatically, and the two-terminal resistance of thesample approximates to the intrinsic resistance of the CNT itself.
The infertile individual analysis based on whole-exome sequencing in chinese multi-ethnic groups
Zhao Qiongzhen,Li Yanqi,Liang Qi,Zhao Jie,Kang Kai,Hou Meiling,Zhang Xin,Du Renqian,Kong Lingyin,Liang Bo,Huang Weidong 한국유전학회 2023 Genes & Genomics Vol.45 No.4
Background Infertility is a common and rapidly growing health issue around the world. The genetic analysis based on the infertile population is crucial for intervention and treatment. Objective To find candidate gene locus led to azoospermia in Chinese multi-ethnic groups and provide theoretical guidance for the diagnosis of genetic diseases to progressively aggravated infertility patients and sterile offspring with ART. Methods The study based on whole-exome sequencing (WES) was presented for genetic characteristic analysis of multi-ethnics and identification of variants related to infertility in Xinjiang area of China. Results The frequency of pathogenic variants showed significant ethnic differences among four main ethnics in Xinjiang. The population structure analysis confirmed that the Hui was close to the Han population, the Kazak was close to the Uygur population, and there are three ancestry components in the four ethnics. In addition, ten candidate variants potentially regulated azoospermia were detected, and KNTC1 (rs7968222: G > T) was chosen to validate the association. Through the analysis in the valid group, the frequency of rs7968222 (G > T) has a significant difference in the azoospermia population (11.76%, 8/68) and normospermia population (4.63%, 35/756) (P < 0.001). Interestingly, the proportion of people with abnormal follicle-stimulating hormone (FSH) level in the group carrying rs7968222 (G > T) was significantly higher than non-carriers (P < 0.05). Therefore, rs7968222 may regulate spermatogenesis through affecting hormone level. Conclusion Our study establishes the genetics analysis of Northwest China and finds a candidate gene locus KNTC1 (rs7968222: G > T), which is one of the genetic susceptibility factors for male azoospermia.
Mass transfer and kinetics study on the sulfite forced oxidation with manganese ion catalyst
Zhao Bo,Li Yan,Zhuo Yuqun,Tong Huiling,Zhang Xiaowen,Chen Changhe 한국화학공학회 2007 Korean Journal of Chemical Engineering Vol.24 No.3
limestone scrubbing is the most common flue gas desulfurization process (FGD) for control of sulfurdioxide emissions from the combustion of fossil fuels. Forced oxidation, which controls the overall reaction of the sulfurdioxide absorption, is the key path of the process. Manganese which comes from the coal is one of the catalysts duringthe forced oxidation process. In the present work, the two-film theory was used to analyze the sulfite forced oxidationreaction with an image boundary recognition technique, and the oxidation rate was experimentally studied by contactingpure oxygen with a sodium sulfite solution. There was a critical sulfite concentration 0.328 mol/Lwithout catalyst ortion constant k; furthermore, we obtained the order with respect to the sulfite and Mn2+ concentrations. When the Mn2+catalyst concentration was kept unchanged, the sulfite oxidation reaction rate was controlled by dual film and the reac-tion kinetics was first order with respect to sulfite while concentration was below 0.328 mol/L; the sulfite oxidationreaction rate was controlled by gas film only and the reaction kinetics was zero order with respect to sulfite while concentration over 0.328 mol/L. When concentration was kept unchanged, the sulfite oxidation reaction rate de-pended on gas-liquid mass transfer and the reaction kinetics was diferent in various stages with respect to Mn2+ con-centrations.