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63篇 您的检索式:作者名="Jiaqi Feng"
    题名 作者 年代 出处 被引量
1Assessment of heavy metal pollution characteristics and human health risk of exposure to ambient PM_(2.5) in Tianjin,China显示文摘To examine the features of heavy metal pollution of PM_(2.5)(particulate matter less than 2.5 μm) in Tianjin,China,as well as the exposure risk of PM_(2.5) to human health,we analyzed ambient PM_(2.5) samples collected from a campus of Nankai University in June,August,and October 2012.The concentrations of PM_(2.5) and heavy metals(Ni,Cu,Pb,Zn,Cr,Cd,Hg,As and Mn) in PM2.5 were analyzed by gravimetric analysis and inductively coupled plasma-mass spectrometry,respectively.The results show that the heavy metals contained in PM_(2.5) were,in descending order,Cu,Zn,Pb,Mn,Cr,Ni,Cd,As,and Hg.The proportion of Cd exceeded the secondary level of National Ambient Air Quality Standard of China(GB 3095-2012) by 1.3times,while others were within the limit.Enrichment factor analysis indicated that Cu,Zn,Cd,Pb,and Hg are mainly from anthropogenic sources.Principal component analysis indicated that the main sources of the heavy metals are vehicle exhaust,chemical waste,and coal-burning activities.The nine heavy metals which may cause health issues by exposure through the human respiratory system and should be further examined are Cr,Cd,As,Ni,Cu,Pb,Mn,Zn,and Hg,in the order of decreasing risk levels.With reference to the U.S.EPA standard the risk levels of all nine metals were below the acceptable level(10^(-6)/year).Peifei Chen Xiaohui Bi Jiaqi Zhang Jianhui Wu Yinchang Feng 2015Particuology2015,13,3:43
2CO2 Electroreduction in Ionic Liquids: A Review显示文摘Jianpeng Feng Shaojuan Zeng Jiaqi Feng Haifeng Dong Xiangping Zhang 2018Chinese Journal of Chemistry2018,36,10:11
3Detection and suppression of narrow band RFI for synthetic aperture radar imaging显示文摘Radio frequency interference(RFI) is becoming more and more frequently, which makes it an important issue in SAR imaging.RFI presented in synthetic aperture radar either on purpose or inadvertent will distort the useful SAR echoes, thus degrade the SAR image quality.To resolve this issue, a long time study was carried out to study the characteristic of the RFI through the RFIaffected spaceborne and airborne SAR data.Based on the narrow band nature of RFI, this paper proposes a new process which contains both RFI detection and RFI suppression.A useful subband spectral kurtosis detector is first used to detect RFI, and then its results are used for RFI suppression.The proposed process has two advantages: one is the economization on the compute time for unnecessary interference suppression when no RFI existed; the other is improving the performance of the suppression method with knowing the exact position where RFI is.Moreover, the previous RFI suppression method––subband spectral cancelation(SSC) is supplemented and perfected.The subband division step is also elaborated detail in this paper.The experiment results show that the subband spectral kurtosis detector exhibits good performance in recognizing both weak and narrow-band RFI.In addition, the validity of the SSC method with subband spectral kurtosis detector is also validated on the real SAR echoes.Yang Lin Zheng Huifang Feng Jin Li Ning Chen Jiaqi 2015Chinese Journal of Aeronautics2015,28,4:8
4Aerodynamic design optimization by using a continuous adjoint method显示文摘This paper presents the fundamentals of a continuous adjoint method and the applications of this method to the aerodynamic design optimization of both external and internal flows.General formulation of the continuous adjoint equations and the corresponding boundary conditions are derived.With the adjoint method,the complete gradient information needed in the design optimization can be obtained by solving the governing flow equations and the corresponding adjoint equations only once for each cost function,regardless of the number of design parameters.An inverse design of airfoil is firstly performed to study the accuracy of the adjoint gradient and the effectiveness of the adjoint method as an inverse design method.Then the method is used to perform a series of single and multiple point design optimization problems involving the drag reduction of airfoil,wing,and wing-body configuration,and the aerodynamic performance improvement of turbine and compressor blade rows.The results demonstrate that the continuous adjoint method can efficiently and significantly improve the aerodynamic performance of the design in a shape optimization problem.LUO JiaQi XIONG JunTao LIU Feng 2014Science China(Physics,Mechanics & Astronomy)2014,57,7:7
5Trot Gait Design and CPG Method for a Quadruped Robot显示文摘Jiaqi Zhang Feng Gao Xiaolei Han Xianbao Chen Xueying Han 2014Journal of Bionic Engineering2014,11,1:7
6Mesenchymal stem cell treatment improves outcome of COVID-19 patients via multiple immunomodulatory mechanisms显示文摘The infusion of coronavirus disease 2019(COVID-19)patients with mesenchymal stem cells(MSCs)potentially improves clinical symptoms,but the underlying mechanism remains unclear.We conducted a randomized,single-blind,placebo-controlled(29 patients/group)phase II clinical trial to validate previous findings and explore the potential mechanisms.Patients treated with umbilical cord-derived MSCs exhibited a shorter hospital stay(P=0.0198)and less time required for symptoms remission(P=0.0194)than those who received placebo.Based on chest images,both severe and critical patients treated with MSCs showed improvement by day 7(P=0.0099)and day 21(P=0.0084).MSC-treated patients had fewer adverse events.MSC infusion reduced the levels of C-reactive protein,proinflammatory cytokines,and neutrophil extracellular traps(NETs)and promoted the maintenance of SARS-CoV-2-specific antibodies.To explore how MSCs modulate the immune system,we employed single-cell RNA sequencing analysis on peripheral blood.Our analysis identified a novel subpopulation of VNN2+hematopoietic stem/progenitorlike(HSPC-like)cells expressing CSF3R and PTPRE that were mobilized following MSC infusion.Genes encoding chemotaxis factors—CX3CR1 and L-selectin—were upregulated in various immune cells.MSC treatment also regulated B cell subsets and increased the expression of costimulatory CD28 in T cells in vivo and in vitro.In addition,an in vivo mouse study confirmed that MSCs suppressed NET release and reduced venous thrombosis by upregulating kindlin-3 signaling.Together,our results underscore the role of MSCs in improving COVID-19 patient outcomes via maintenance of immune homeostasis.Rongjia Zhu Tingdong Yan Yingmei Feng Yan Liu Hongcui Cao Gongxin Peng Yanlei Yang Zhen Xu Jingqi Liu Wei Hou Xiaoyue Wang Zhe Li Luchan Deng Shihua Wang Jing Li Qin Han Hongling Li Guangliang Shan Yinghao Cao Xingyan An Jianshe Yan Zhonghui Zhang Huafei Li Xuebin Qu Jiaqi Zhu Shumin Zhou Jiao Wang Fengchun Zhang Jinming Gao Ronghua Jin Dayong Xu Yan-Qing Ma Tao Huang Shuang Peng Zhi Zheng Ilia Stambler Eric Gilson Lee Wei Lim Alexey Moskalev Antonio Cano Sasanka Chakrabarti Brun Ulfhake Huanxing Su Haoying Xu Sihuan Xu Feng Wei Holly MBrown-Borg Kyung-Jin Min Georgina Ellison-Hughes Calogero Caruso Kunlin Jin Robert Chunhua Zhao 2021Cell Research2021,31,12:5
7Downregulation of circ-ZNF609 Promotes Heart Repair by Modulating RNA N^(6)-Methyladenosine-Modified Yap Expression显示文摘Circular RNAs take crucial roles in several pathophysiological processes.The regulatory role and its underlying mechanisms of circ-ZNF609 in the heart remains largely unknown.Here,we report that circ-ZNF609 is upregulated during myocardial ischemia/reperfusion(I/R)remodeling.Knockdown of circ-ZNF609 protects against acute I/R injury and attenuates left ventricle dysfunction after I/R remodeling in vivo.In vitro,circ-ZNF609 regulates cardiomyocyte survival and proliferation via modulating the crosstalk between Hippo-YAP and Akt signaling.Mechanically,N6-methyladenosine-modification is involved in the regulatory role of circ-ZNF609 on YAP.An in-depth study indicates that knockdown of circ-ZNF609 decreases the expression of YTHDF3 and further fine-tuned the accessibility of Yap mRNA to YTHDF1 and YTHDF2 to regulate YAP expression.circ-ZNF609 knockdown represents a promising therapeutic strategy to combat the pathological process of myocardial I/R injury.Lijun Wang Pujiao Yu Jiaqi Wang Guie Xu Tianhui Wang Jingyi Feng Yihua Bei Jiahong Xu Hongbao Wang Saumya Das Junjie Xiao 2022Research2022,,3:3
8SP1 governs primordial folliculogenesis by regulating pregranulosa cell development in mice显示文摘Establishment of the primordial follicle(PF)pool is pivotal for the female reproductive lifespan;however,the mechanism of primordial folliculogenesis is poorly understood.Here,the transcription factor SP1 was shown to be essential for PF formation in mice.Our results showed that SP1 is present in both oocytes and somatic cells during PF formation in the ovary.Knockdown of Sp1 expression,especially in pregranulosa cells,significantly suppressed nest breakdown,oocyte apoptosis,and PF formation,suggesting that SP1 expressed by somatic cells functions in the process of primordial folliculogenesis.We further demonstrated that SP1 governs the recruitment and maintenance of Forkhead box L2-positive(FOXL2^+)pregranulosa cells using an Lgr5-EGFP-IRES-CreER^T2(Lgr5-KI)reporter mouse model and a FOXL2^+ cell-specific knockdown model.At the molecular level,SP1 functioned mainly through manipulation of NOTCH2 expression by binding directly to the promoter of the Notch2 gene.Finally,consistent with the critical role of granulosa cells in follicle survival in vitro,massive loss of oocytes in SP1 knockdown ovaries was evidenced before puberty after the ovaries were tranSP1anted under the renal capsules.Conclusively,our results reveal that SP1 controls the establishment of the ovarian reserve by regulating pregranulosa cell development in the mammalian ovary.Han Cai Bingying Liu Huarong Wang Guanghong Sun Lizhao Feng Ziqi Chen Jiaqi Zhou Jiawei Zhang Tuo Zhang Meina He Tingting Yang Qirui Guo Zhen Teng Qiliang Xin Bo Zhou Hua Zhang Guoliang Xia Chao Wang 2020Journal of Molecular Cell Biology2020,12,3:3
9Pigeon-inspired optimization and extreme learning machine via wavelet packet analysis for predicting bulk commodity futures prices显示文摘In this paper, a hybrid approach consisting of pigeon-inspired optimization(PIO) and extreme learning machine(ELM) based on wavelet packet analysis(WPA) is presented for predicting bulk commodity futures prices. Firstly, WPA is applied to decompose the original futures prices into a set of lower-frequency subseries. Secondly, the PIO algorithm is used to optimize the parameters of ELM and then the optimized ELM is utilized to forecast the subseries. Finally, we adopt the hybrid method to calculate the final forecasting outcomes of futures prices. In order to further test the predictive ability of the hybrid forecasting model on bulk commodity futures prices, we use the prices of West Texas Intermediate crude oil futures and Chicago Board of Trade soybean futures to make one-step, two-step and four-step ahead predictions. In comparison with complete ensemble empirical mode decomposition with adaptive noise, empirical mode decomposition and singular spectrum analysis, WPA is the most suitable for decomposing bulk commodity futures prices.The experimental outcomes show that the hybrid WPA-PIO-ELM model has better performance on horizontal precision, directional precision and robustness.Feng JIANG Jiaqi HE Zhigang ZENG 2019Science China(Information Sciences)2019,62,7:2
10Novel Kriging-Based Decomposed-Coordinated Approach for Estimating the Clearance Reliability of Assembled Structures显示文摘Turbine blisks are assembled using blades,disks and casings.They can endure complex loads at a high temperature,high pressure and high speed.The safe operation of assembled structures depends on the reliability of each component.Monte Carlo(MC)simulation is commonly used to analyze structural reliability,but this method needs to run thousands of computations.In order to assess the clearance reliability of assembled structures in an efficient and precise manner,the novel Kriging-based decomposed-coordinated(DC)(DCNK)approach is proposed by integrating the DC strategy,the Kriging model and the importance sampling-based Markov chain(MCIS)technique.In this method,the DC strategy is used to decompose a multi-objective problem into many single-objective problems.The relationships between these many single-objectives and the overall objective are then coordinated.The Kriging model is applied to establish the limit state functions of the single-objectives and multi-objective problems,while the MCIS method is used to assess the structural assembled clearance reliability.Moreover,a highly nonlinear complex compound function is first utilized to verify the DCNK model from a mathematical perspective.Then,the reliability of an aeroengine high-pressure turbine(HPT)blade-tip radial running clearance(BTRRC)is analyzed to validate the DCNK approach by considering thermo-structural interaction.The analytical results show that the reliability is 0.9976 when the allowance value of the BTTRC is 1.7650×10^(−3)m.Compared with different methodologies(including direct simulation,the classical Kriging model,and the weighted response surface method(WRSM)),the proposed method holds obvious advantages in computing time and precision,as well as simulation efficiency and precision.The efforts of this paper provide a useful approach to analyzing assembled clearance reliability and contribute to the development of structural reliability theory.Da Teng Yunwen Feng Cheng Lu Chengwei Fei Jiaqi Liu Xiaofeng Xue 2021Computer Modeling in Engineering & Sciences2021,,11:2
11Personalized cancer vaccines from bacteria-derived outer membrane vesicles with antibody-mediated persistent uptake by dendritic cells显示文摘Nanocarriers with intrinsic immune adjuvant properties can activate the innate immune system while delivering tumor antigen,thus efficiently facilitating antitumor adaptive immunity.Bacteria-derived outer membrane vesicles(OMVs)are an excellent candidate due to their abundance of pathogen associated molecular patterns.However,during the uptake of OMVs by dendritic cells(DCs),the interaction between lipopolysaccharide and toll-like receptor 4 induces rapid DC maturation and uptake blockage,a phenomenon we refer to as“maturation-induced uptake obstruction'(MUO).Herein we decorated OMV with the DC-targeting aDEC205 antibody(OMV-DEC),which endowed the nanovaccine with an uptake mechanism termed as 4Jie Liang Keman Cheng Yao Li Jiaqi Xu Yiwei Chen Nana Ma Qingqing Feng Fei Zhu Xiaotu Ma Tianjiao Zhang Yale Yue Guangna Liu Xinjing Guo Zhiqiang Chen Xinwei Wang Ruifang Zhao Ying Zhao Jian Shi Xiao Zhao Guangjun Nie 2022Fundamental Research2022,2,1:2
12Novel internal photoemission in manganite/ZnO heterostructure显示文摘A novel photovoltaic phenomenon of internal photoemission was found in a low cost manganite La0.62Ca0.29K 0.09MnO3 (LCKMO)/zinc oxide (ZnO) heterojunction bilayers grown on ITO substrate by pulsed laser deposition (PLD) at relative low growth temperature. The heterostructure ITO/LCKMO/ZnO/Al exhibits reproducible rectifying characteristics and light current under continuous laser irradiation of = 325 nm. We report here the influence of LCKMO/ZnO bilayers' thickness on the electrical and photoelectric properties of the heterostructure at room temperature. The power conversion efficiency (PCE) is achieved when the LCKMO and ZnO layers are thin enough or the full space charge layer is sufficient. We obtained the maximum value of PCE of 0.0145% when the thicknesses of LCKMO and ZnO layers are 25 and 150 nm, respectively. The open circuit voltage is 0.04 V under this condition due to the internal photoemission.ZHANG JiaQi HUANG KeKe SI WenZhe WU XiaoFeng CHENG Gang FENG ShouHua 2013Science China Chemistry2013,56,5:2
13Flow reconstructions and aerodynamic shape optimization of turbomachinery blades by POD-based hybrid models显示文摘This study presented a hybrid model method based on proper orthogonal decomposition(POD) for flow field reconstructions and aerodynamic design optimization. The POD basis modes have better description performance in a system space compared to the widely used semi-empirical basis functions because they are obtained through singular value decomposition of the system.Instead of the widely used linear regression, nonlinear regression methods are used in the function response of the coefficients of POD basis modes. Moreover, an adaptive Latin hypercube design method with improved space filling and correlation based on a multi-objective optimization approach was employed to supply the necessary samples. Prior to design optimization, the response performance of POD-based hybrid models was first investigated and validated through flow reconstructions of both single-and multiple blade rows. Then, an inverse design was performed to approach a given spanwise flow turning distribution at the outlet of a turbine blade by changing the spanwise stagger angle, based on the hybrid model method. Finally, the span wise blade sweep of a transonic compressor rotor and the spanwise stagger angle of the stator blade of a single low-speed compressor stage were modified to reduce the flow losses with the constraints of mass flow rate, total pressure ratio, and outlet flow turning.The results are presented in detail, demonstrating the good response performance of POD-based hybrid models on missing data reconstructions and the effectiveness of POD-based hybrid model method in aerodynamic design optimization.LUO JiaQi ZHU YaLu TANG Xiao LIU Feng 2017Science China(Technological Sciences)2017,60,11:2
14Streptococcal Toxic Shock Syndrome Caused by Streptococcus suis Serotype 2 显示文摘Jiaqi Tang Changjun Wang Youjun Feng 2006PLoS Med2006,3,5:1
15Greenness identification based on HSV decision tree显示文摘Greenness identification from crop images captured outdoors is the important step for crop growth monitoring.The commonly used methods for greenness identification are based on visible spectral-index,such as the excess green index,the excess green minus excess red index,the vegetative index,the color index of vegetation extraction,the combined index.All these visible spectral-index based methods are working on the assumption that plants display a clear high degree of greenness,and soil is the only background element.In fact,the brightness and contrast of an image coming from outdoor environments are seriously affected by the weather conditions and the capture time.The color of the plant varies from dark green to bright green.The back ground elements may contain crop straw,straw ash besides soil.These environmental factors always make the visible spectral-index based methods unable to work correctly.In this paper,an HSV decision tree based method for greenness identification from maize seedling images captured outdoors is proposed.Firstly,the image was converted from RGB color space to HSV color space to avoid influence of illumination.Secondly,most of the background pixels were removed according to their hue values compared with the ones of green plants.Thirdly,the pixels of wheat straws whose hue values were intersected with tender green leaves were eliminated subject to their hues,saturations and values.At last,thresholding was employed to get the green plants.The results indicate that the proposed method can recognize greenness pixels correctly from the crop images captured outdoors.Wenzhu Yang Sile Wang Xiaolan Zhao Jingsi Zhang Jiaqi Feng 2015Information Processing in Agriculture2015,2,3:1
16Flow computations of multi-stages by URANS and flux balanced mixing models显示文摘The quasi-steady methods based on mixing models have been widely applied to flow computations of turbomachinery multistages in aerospace engineering. Meanwhile, the unsteady numerical simulation has also been used due to its ability in obtaining time-dependent flow solutions. In the paper, two different mixing treatments and the corresponding flux balanced ones are presented to exchange the flow solutions on the interfaces between adjacent blade rows. The four mixing treatments are then used for flow computations of a subsonic 1.5-stage axial turbine and a quasi-1.5-stage transonic compressor rotor. The results are compared with those by unsteady numerical method, which is implemented by using the sliding mesh technique. The effects of the quasi-steady and unsteady computation methods on the conservation of flow solutions across the interfaces are presented and addressed. Furthermore, the influence of mixing treatments on shock wave and flow separation of the transonic compressor rotor is presented in detail. All the results demonstrate that the flux balanced mixing treatments can be used for multi-stage flow computations with improved performance on interface conservation, even in the complex flows.ZHU YaLu LUO JiaQi LIU Feng 2018Science China(Technological Sciences)2018,61,7:1
17Electrospun ZnO Nanofibers‐Based Ultraviolet Detector with High Responsivity显示文摘Linghui Zhu Xuehui Gu Fengdong Qu Jiaqi Zhang Caihui Feng Jingran Zhou Shengping Ruan Bonan Kang 2013J Am Ceram Soc2013,,10:1
18Distribution and environmental impact factors of picophytoplankton in the East China Sea during spring显示文摘Marine picophytoplankton(Pico)as a major contributor to primary productivity in oligotrophic waters,play a very important role in marine material cycle and energy conversion,and their key role in the carbon cycle and global climate change is increasingly emphasized.To study the factors aff ecting the dynamic distribution of Synechococcus,Prochlorococcus,and picoeukaryotes in the East China Sea(ECS),a marginal sea of the Northwest Pacific,we investigated 27 stations in May 2017,and collected 148 samples of Pico and nutrients from the surface to the bottom.By means of flow cytometry,the abundance of Pico was measured,and then we estimated the carbon biomass and analyzed the distribution of Pico.Finally,combined with the ECS unique geographical situation and hydrological regime,we evaluated various factors aff ecting the Pico in the ECS.In Pico community,the picoeukaryotes cell abundance was between 0.49×10^(2)-1.44×10^(4) cells/mL.Prochlorococcus ranged from 1.36×10^(3)-3.47×10^(4) cells/mL and Synechococcus ranged from 0.69×10^(3)-1.15×105 cells/mL.Synechococcus was the most,both in abundance and in carbon biomass.Picoeukaryotes were the least in abundance,but has larger contribution to carbon biomass than Prochlorococcus.Water temperature,salinity,and stability of water column influenced Pico distribution.Picoeukaryotes were abundant in the shelf sea,whereas Synechococcus and Prochlorococcus were detected in the northeast of Taiwan,China.This study provided basic information for the study of Pico communities in the ECS and its adjacent marine ecosystem.Feng WANG Yuqiu WEI Jiaqi YUE Congcong GUO Jun SUN 2021Journal of Oceanology and Limnology2021,39,4:1
19Generalized stability criterion for controlling solidification segregation upon twin-roll casting显示文摘Macro-and micro-segregation formed upon twin-roll casting(TRC)can be inherited from sub-rapid solid-ification to solid-state transformation,even to plastic deformation,thus deteriorating drastically mechan-ical properties of as-produced thin sheets.Although many works focusing mainly on controlling fields of thermal,concentration and convection have been reported,how to control artificially and quantitatively the segregation using a theoretical connection between processing parameters and solidification models,has not been realized,yet.Regarding it,a systematical framework integrating non-equilibrium dendritic growth and overall solidification kinetics with the TRC parameters,was constructed applying a general-ized stability(GS)conception deduced from transient thermodynamic driving force△G^(t)and transient ki-netic energy barrier Q_(eff)^(t)evolving upon solidification.Departing from this framework considering synergy of thermodynamics and kinetics(i.e.,thermo-kinetic synergy),a criterion of high△G^(t)-high GS guaranteed that the macro(i.e.,the centerline)and the micro(i.e.,the edge)segregation can be suppressed by in-creasing△G^(t)and GS at the beginning and the ending stage of sub-rapid solidification,respectively.This typical thermo-kinetic combination producing the microstructure can be inherited into the plastic de-formation,as reflected by corresponding strength-ductility combinations.This work realized quantitative controlling of TRC by a theoretical connection between processing parameters and solidification models,where,an optimization for sub-rapid solidification segregation using the GS conception including△G^(t)and Q_(eff)^(t)has been performed.Pan Wu Yubing Zhang Jiaqi Hu Shaojie Song Yong Li Huiyuan Wang Guo Yuan Zhaodong Wang Shizhong Wei Feng Liu 2023Journal of Materials Science & Technology2023,,3:1
20Diagnostic value of combination of rapid on-site evaluation and radial endobronchial ultrasound for peripheral pulmonary infectious lesions显示文摘Peripheral pulmonary lesions(PPLs)are surrounded by lung parenchyma and invisible under an endoscope.The detection rate of PPLs by routine bronchoscopy is low.Radial endobronchial ultrasound(R-EBUS)can overcome those limitations,as it can locate peripheral bronchial lesions through a characteristic ultrasound signal.Rapid on-site evaluation(ROSE)is a real-time rapid cytological interpretation technology accompanied by tissue sampling.ROSEis helpful in improving the diagnostic rate of R-EBUS for PPLs,especially lung cancer.[1]However,the utility of ROSE during R-EBUS for peripheral pulmonary infectious lesions(infectious PPLs)is unclear.This study aimed to analyze the diagnostic value and safety of R-EBUS combined with ROSE in infectious PPLs.The study was approved by the Ethics Committee of the Third Affiliated Hospital of Soochow University(No.2019-017).The informed consent form was signed by the patient or his or her authorized legal representative.Min Li Jiaqi Cao Qian He Ming Zhang Qianqian Xu Wenya Su Chunlai Feng 2022Chinese Medical Journal2022,135,23:1
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