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Jiansheng Zhang,Linlin Cao,Jian Cui,Haikui Ren,Yun Wang,Dazhuan Wu 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.10
The effect of non-uniform inflow on the spatial and temporal distribution of impeller excitation is investigated. The experiments are first conducted to verify the hydraulic performance of the axial flow pump and to provide a reference for the accuracy of the numerical simulations. Subsequently, the effect of non-uniform inflow on the spatial and temporal distribution of the flow field and impeller load is investigated. The results indicate that the non-uniform inflow modifies the velocity distribution at the impeller inlet, resulting in alterations in the attack angle and subsequently affecting the radial and circumferential distribution of the impeller load. The extreme difference in the head between the different blades can reach up to 36 % of the total head. Furthermore, velocity pulsation and attack pulsation exhibit more pronounced fluctuations in the low-speed region, and there exists a strong correlation between the amplitude of unsteady forces and the magnitude of the impeller load.
Energy spread minimization in a cascaded laser wakefield accelerator via velocity bunching
Zhang, Zhijun,Li, Wentao,Liu, Jiansheng,Wang, Wentao,Yu, Changhai,Tian, Ye,Nakajima, Kazuhisa,Deng, Aihua,Qi, Rong,Wang, Cheng,Qin, Zhiyong,Fang, Ming,Liu, Jiaqi,Xia, Changquan,Li, Ruxin,Xu, Zhizhan American Institute of Physics 2016 Physics of plasmas Vol.23 No.5
Liu Jiansheng,Li Jiajia,Zhang Shu,Ding Mengbin,Yu Ningyue,Li Jingchao,Wang Xiuhui,Li Zhaohui 나노기술연구협의회 2022 Nano Convergence Vol.9 No.13
Infrared neural stimulation with the assistance of photothermal transducers holds great promise as a mini-invasive neural modulation modality. Optical nanoparticles with the absorption in the near-infrared (NIR) window have emerged as excellent photothermal transducers due to their good biocompatibility, surface modifiability, and tunable optical absorption. However, poor activation efficiency and limited stimulation depth are main predicaments encountered in the neural stimulation mediated by these nanoparticles. In this study, we prepared a targeted polydopamine (PDA)-coated gold (Au) nanoparticles with specific binding to thermo-sensitive ion channel as nanotransducers for second near-infrared (NIR-II) photo-stimulation of neurons in rats. The targeted Au nanoparticles were constructed via conjugation of anti-TRPV1 antibody with PEGylated PDA-coated Au nanoparticles and thus exhibited potent photothermal performance property in the second NIR (NIR-II) window and converted NIR-II light to heat to rapidly activate Ca 2+ influx of neurons in vitro. Furthermore, wireless photothermal stimulation of neurons in living rat successfully evoke excitation in neurons in the targeted brain region as deep as 5 mm beneath cortex. This study thus demonstrates a remote-controlled strategy for neuromodulation using photothermal nanotransducers.
Boyuan Zhang,Jiansheng Yuan,Jun Zou,Jaebok Lee,Mun-No Ju [Institute of Electrical and Electronics Engineers 2016 IEEE transactions on electromagnetic compatibility Vol.58 No.2
<P>A semianalytical inverse Fourier transform, which can evaluate the time response at arbitrary time, is proposed. The basic idea is fitting the response in frequency domain by a sum of piecewise cubic spline functions with an adaptive sampling strategy, and the response in time domain is evaluated with the help of the moment functions to avoid calculating the highly oscillatory integral. A recursive algorithm is derived, which can efficiently calculate the moment functions with different ranks. As an application of the proposed approach, the underground horizontal electric field of a lightning channel is evaluated in the time domain. In comparison with the results in the published literature, the numerical examples show that the proposed approach can save the computational time at least 50 times compared to the one using a conventional inverse Fourier transform technique. The proposed approach, in fact, can be generalized to apply to other scenarios when the inverse Fourier transform is involved.</P>
Yang, Yue,Zhang, Xiaoguang,Fan, Jiansheng,Bai, Yu Techno-Press 2015 Advances in concrete construction Vol.3 No.4
A bridge widening technology using steel-concrete composite system was developed and is presented in this paper. The widened superstructure system consists of a newly built composite steel-concrete girder with concrete deck and steel diaphragms attached to the existing concrete girders. This method has been applied in several bridge widening projects in China, and one of those projects is presented in detail. Due to the higher stiffness-to-weight ratio and the rapid erection of composite girders, this widening method reveals benefits in both mechanical performance and construction. As only a few methods for the design of bridges with different types of girders are recommended in current design codes, a more accurate analytical method of estimating live load distribution on girder bridges was developed. In the analytical model, the effects of span length, girder pacing, diaphragms, concrete decks were considered, as well as the torsional and flexural stiffness of both composite box girders and concrete T girders. The study shows that the AASHTO LRFD specification procedures and the analytical models proposed in this paper closely approximate the live load distribution factors determined by finite element analysis. A parametric study was also conducted using the finite element method to evaluate the potential load carrying capacities of the existing concrete girders after widening.
Zhi Li,Zhang Yujiao,Xiang Guanteng,Yuan Jiansheng,Jiang Lan 한국전기전자재료학회 2021 Transactions on Electrical and Electronic Material Vol.22 No.3
Considering the frequent breakage of the hard jumper shield ring in the strain tower of ultra-high voltage alternating current 1000 kV Nan-Jing Transmission Line, the theoretical and experimental studies on new shield ring were carried out in terms of mechanical properties; however, due to the structural changes of shield ring, the fi eld characteristics should be calculated and analyzed. In accordance with the theory that there is no electric field in a metal conductor under electrostatic equilibrium, if there is any metal conductor in the 3D model of the computational domain, there will be no need to subdivide the metal conductor. In this paper, a 3D model load applying method with metal conductors was proposed to calculate the field intensity of Tuned mass damper (TMD) shield ring after improving the mechanical properties of the strain tower, which saved the total number of mesh subdivisions by 48.02%, reduced the computational time by 76.47%, and increased the computational effi ciency of 3D numerical electric field. The calculation results validated the correctness and effectiveness of this method. The new TMD shield ring with the field intensity meeting the relevant requirements was adopted in 1000 kV Nan-Jing Loop Transmission Line in December 2016, which has been operating in good condition so far.
Xuan Weiwei,Zhang Jiansheng,Xia Dehong 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.59 No.-
Crystallization inside the liquid slag can increase the viscosity, affecting flow down the wall which is associated with the temperature of critical viscosity (Tcv). Four groups of synthetic slags with different Si/Al, Si + Al, CaO, Fe2O3 ratios were sorted to study the crystallization characteristics including the crystallization tendency as well as crystallization temperature (Tcrys). Samples with base–acid ratio (R > 0.7) and Si/Al in the range of 1–4 are liable to crystallize with obvious crystallization peak on DSC curve, and the influence of R is more than that of Si/Al. The crystallization temperature (Tcrys) is found to display a linear relationship with the liquidus temperature (Tliq). The deviation of real coal slag with synthetic slag is associated with the crystalline phases as well as the raw minerals present in the ash.
Experimental studies on gasification of the Shenmu coal char with CO2 at elevated pressures
Wang Mingmin,Zhang Jiansheng,Zhang Shouyu,Wu Jinhu,Yue Guangxi 한국화학공학회 2008 Korean Journal of Chemical Engineering Vol.25 No.6
The gasification rates of Shenmu coal chars with CO2 were experimentally studied with a pressurized thermo- gravimetric analyzer (PTGA). Shenmu coal is a typical Chinese coal, and the coal char was prepared by a fixedbed reactor in nitrogen at 900 oC. The experiments were carried out in the dynamic heating segments from 750 oC to 1,000 oC, and the reaction pressure increased from 0.1MPa to 3.1MPa with pure CO2. The external diffusion resistances were minimized by increasing the flow rates and decreasing the thickness of sample layer before the test, to ensure the reactions were under kinetic control. The results show that the gasification rates increase proportionally to the 0.1 power of the CO2 partial pressure. The unreacted-core shrinking model was applied to predict the reaction rate by changing the molar fraction of CO2 at 0.6Mpa and 1.6Mpa total pressures, which showed a good match with experimental data.
Sox12 Is a Cancer Stem-Like Cell Marker in Hepatocellular Carcinoma
Song Zou,Chen Wang,Jiansheng Liu,Qun Wang,Dongdong Zhang,Shengnan Zhu,Shengyuan Xu,Mafei Kang,Shaozhong He 한국분자세포생물학회 2017 Molecules and cells Vol.40 No.11
Recent studies on molecular carcinogenesis suggest that the chemo-resistance of some cancers is largely due to presence of cancer stem cells (CSCs), which affect the chemotherapy outcome for hepatocellular carcinoma (HCC). However, currently no consensus on a CSC phenotype in HCC has been obtained. Here, we examined Sox12 as a novel CSC marker in HCC. Sox12+ versus Sox12- cells were purified from HCC cell lines. The Sox12+ cells were compared with Sox12- HCC cells for tumor sphere formation, chemo-resistance, tumor formation after serial adoptive transplantations in nude mice, and the frequency of developing distal metastasis. We found that compared to Sox12- HCC cells, Sox12+ HCC cells generated significantly more tumor spheres in culture, were more chemo-resistant to cisplatin, were detected in circulation more frequently, and formed distal tumor more frequently. Moreover, Sox12 ap-peared to functionally contribute to the stemness of HCC cells. Thus, we conclude that Sox12 may be a novel marker for enriching CSCs in HCC.
Sox12 Is a Cancer Stem-Like Cell Marker in Hepatocellular Carcinoma
Zou, Song,Wang, Chen,Liu, Jiansheng,Wang, Qun,Zhang, Dongdong,Zhu, Shengnan,Xu, Shengyuan,Kang, Mafei,He, Shaozhong Korean Society for Molecular and Cellular Biology 2017 Molecules and cells Vol.40 No.11
Recent studies on molecular carcinogenesis suggest that the chemo-resistance of some cancers is largely due to presence of cancer stem cells (CSCs), which affect the chemotherapy outcome for hepatocellular carcinoma (HCC). However, currently no consensus on a CSC phenotype in HCC has been obtained. Here, we examined Sox12 as a novel CSC marker in HCC. Sox12+ versus Sox12- cells were purified from HCC cell lines. The Sox12+ cells were compared with Sox12- HCC cells for tumor sphere formation, chemo-resistance, tumor formation after serial adoptive transplantations in nude mice, and the frequency of developing distal metastasis. We found that compared to Sox12- HCC cells, Sox12+ HCC cells generated significantly more tumor spheres in culture, were more chemo-resistant to cisplatin, were detected in circulation more frequently, and formed distal tumor more frequently. Moreover, Sox12 appeared to functionally contribute to the stemness of HCC cells. Thus, we conclude that Sox12 may be a novel marker for enriching CSCs in HCC.