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| 1 | Effects of Ce and Sb on the microstructure and properties of AZ91D magnesium alloy prepared by the EPC process显示文摘The effects of small amounts of cerium and antimony additions on the microstructure and the mechanical properties of AZ91D(Mg-9Al-Zn) based alloy were researched via the expendable pattern casting(EPC) process.The results show that the microstructure is obviously refined and the tensile strength of the AZ91D based alloy at ambient temperature is significantly improved.When compared to AZ91D,the AZ91D-1.0%Ce-0.4%Sb alloy has higher ultimate tensile strength and elongation.Its ultimate tensile strength and elongation are enhanced by 39% and 47%,respectively.The morphology of the tensile fracture of the AZ91D-1.0%Ce-0.4%Sb alloy has more characteristics of quasi-cleavage.This indicates that it has had a larger plastic deformation before failure.The tensile strength and elongation decrease with the increase of Ce and Sb contents because of the coarsening and volume increase of CeSb and Al11Ce3 phases. | LI Jiqiang DONG Xuanpu FAN Zitian WANG Yuanqing | 2008 | Rare Metals2008，27，1： | 19 |
| 2 | Welding Deviation Detection Algorithm Based on Extremum of Molten Pool Image Contour显示文摘The welding deviation detection is the basis of robotic tracking welding, but the on-line real-time measurement of welding deviation is still not well solved by the existing methods. There is plenty of information in the gas metal arc welding(GMAW) molten pool images that is very important for the control of welding seam tracking. The physical meaning for the curvature extremum of molten pool contour is revealed by researching the molten pool images, that is, the deviation information points of welding wire center and the molten tip center are the maxima and the local maxima of the contour curvature, and the horizontal welding deviation is the position difference of these two extremum points. A new method of weld deviation detection is presented, including the process of preprocessing molten pool images, extracting and segmenting the contours, obtaining the contour extremum points, and calculating the welding deviation, etc. Extracting the contours is the premise, segmenting the contour lines is the foundation, and obtaining the contour extremum points is the key. The contour images can be extracted with the method of discrete dyadic wavelet transform, which is divided into two sub contours including welding wire and molten tip separately. The curvature value of each point of the two sub contour lines is calculated based on the approximate curvature formula of multi-points for plane curve, and the two points of the curvature extremum are the characteristics needed for the welding deviation calculation. The results of the tests and analyses show that the maximum error of the obtained on-line welding deviation is 2 pixels(0.16 mm), and the algorithm is stable enough to meet the requirements of the pipeline in real-time control at a speed of less than 500 mm/min. The method can be applied to the on-line automatic welding deviation detection. | ZOU Yong JIANG Lipei LI Yunhua XUE Long HUANG Junfen HUANG Jiqiang | 2016 | Chinese Journal of Mechanical Engineering2016，29，1： | 12 |
| 3 | RNA interference targeting CD147 inhibits metastasis and invasion of human breast cancer MCF-7 cells by downregulating MIVIP-9/VEGF expression显示文摘 | Fang Li Junping Zhang Jiqiang Guo Yuan Jia Yaping Han Zhuanhua Wang | 2018 | Acta Biochimica et Biophysica Sinica2018，50，7： | 7 |
| 4 | Influence of mechanical vibration on the solidification of a lost foam cast 356 alloy显示文摘Mechanical vibration was applied to the solidification of a lost foam cast(LFC) 356 aluminum alloy.Effects of mechanical vibration,with different peak acceleration,on the size and morphology of α-Al phase,and also on the mechanical properties of the castings were studied.Results indicated that α-Al dendrites gradually grow into equiaxed grains as the peak acceleration of vibration is increased.When the peak acceleration is between about 1 to 4 g,α-Al phase distribution is uniform and is refined obviously.α-Al dendrites are reduced and the mechanical properties of the castings are improved significantly when compared to those of the castings that are produced without vibration.However,when the peak acceleration is higher than 4 g,strong vibration will lead to defects formation,such as sand adhesion,while the amount and size of pores will be increased.And due to the turbulent flow that caused by strong vibration,the chance of forming large pores in the matrix has been increased significantly.The increase in defects will result in the deterioration of mechanical properties. | Zhao Zhong Fan Zitian Dong Xuanpu Tang Bo Pan Di Li Jiqiang | 2010 | China Foundry2010，7，1： | 7 |
| 5 | Study on typical hole defects in AZ91D magnesium alloy prepared by low pressure lost foam casting显示文摘The hole defects can easily occur in magnesium alloy castings that are prepared by low pressure lost foam casting(LP-LFC)process when the process parameters such as vacuum,pouring temperature and f illing velocity are not properly selected.In this study,the forming mechanism of the hole defects in AZ91D magnesium castings by LP-LFC process was investigated.The shape,location and surface appearance of the hole defects were observed using optical microscopy and scanning electron microscopy,and the chemical composition on the surface of the holes was analyzed using energy spectrometer.The result indicates that there are two types of hole defects,i.e.,the pyrolysis products related hole defects,including concentrative hole and blow hole defects,and slag related hole defects.The concentrative hole and the blow-hole defects were formed either by the liquidEPS degradation products entrapped in the molten metal under the condition that the pouring temperature is equal to or lower than 730℃,or by the hindered transport of EPS pyrolysis products.Some irregular shape hole defects were caused by slag or by coating slough entrapment when the pouring temperature is equal to 750℃and the f illing velocity is equal to or greater than 100 mm·s-1.To reduce or eliminate the hole defects,the vacuum and f illing velocity must be properly chosen to ensure that the metal front prof ile exhibits convex shape and in laminar current state,and the pouring temperature should be just high enough to ensure that the molten melt has adequate heat energy to complete the foam pyrolysis and to fully occupy the mould.For AZ91D magnesium castings in this study,the parameters should be 730℃pouring temperature,0.02-0.03 MPa vacuum and 80mm·s-1f illing velocity. | Li Jiqiang Zhao zhong Fan Zitian Dong Xuanpu Shi Hualiang | 2013 | China Foundry2013，10，4： | 5 |
| 6 | Ultraviolet irradiation induced oxidative stress and response of antioxidant system in an intertidal macroalgae Corallina officinalis L.显示文摘The response of the antioxidant defense system of an intertidal macroalgae Corallina officinalis L.to different dosages of UV-B irradiation was investigated.Results showed that superoxide dimutase (SOD) and peroxidase (POX) increased and then maintained at a relatively stable level when subjected to UV-B irradiation.Catalase (CAT) activity under medium dosage of UV-B irradiation (Muv) and high dosage of UV-B irradiation (Huv) treatments were significantly decreased.Ascorbate peroxidase (APX) activity first remained unaltered and then increased in Huv treatment.In addition,the assay on isozymes was carried out using non-denaturing polyacrylamide gel electrophoresis (PAGE).The activities of some SOD isoforms were altered by UV-B.Two new bands (POX V and POX VII) appeared upon exposure to all three UV-B dosages.CAT III activity was increased by low dosage of UV-B irradiation (Luv),whereas CAT III and CAT IV disappeared when the alga was exposed to Muv and Huv.Two bands of APX (APX VI and APX VII) were increased and a new band (APX X) was observed under Huv exposure.H 2 O 2 and thiobarbituric acid reacting substance (TBARS) increased under Muv and Huv treatments.Overall,UV-B protection mechanisms are partly inducible and to a certain extent sufficient to prevent the accumulation of damage in C.officinalis. | Lixia Li Jiqiang Zhao Xuexi Tang | 2010 | Journal of Environmental Sciences2010，22，5： | 5 |
| 7 | Mathematical model study on the damage of the liquid phase to productivity in the gas reservoir with a bottom water zone显示文摘The production process in the gas reservoir with an aquifer is complex.With gas production,aquifer water could possibly flow into the production well and accumulate within the well bore,which leads to a lower production rate and may even block the producer.However,few studies in the literature investigate the damage caused by the liquid phase in this kind of reservoir or predict gas productivity using the relationship between reservoir pressure and water gas ratio(WGR).For this reason,it is important to know the effects of the formation of liquid phase behavior on production when an aquifer is present under a gas reservoir.From the results of published literature reviews,we found that studies focused on the production of a gas reservoir with bottom water.Nevertheless,for gas well damage from the liquid phase behavior,we found that there was no statistical data or mathematical model of the relationship between reservoir pressure and the gas oil ratio(GOR),which affects production.In this research,based on the theory of fluid flow in porous media,a new mathematical model of water and gas production and a new equation on gas well productivity is developed.To verify the model and equation,gas production data collected from the field are applied.By analyzing the typical gas reservoir with bottom water and the collected data,influences from the liquid phase behavior are shown.In this way,mathematical relationships between reservoir pressure and the WGR and between the GOR and production decline were obtained.The new gas productivity model is derived from the gas and water pseudo pressure functions,which can be applied to analyze well damage caused by the liquid phase.In order to verify the mathematical model,production data were collected from a typical gas reservoir with an aquifer located in the Changxing gas reservoir.The results indicate that a semi-logarithmic linear relationship is obtained between the WGR and productivity decrease.When the WGR increases from 0.5 to 15m3/104m3,damage caused by liquid phase decreases to 59%.The tendency of gas productivity in the Changxing gas reservoir was obtained so that it decreases as reservoir pressure decreases and increases as the WGR decreases.The gradient of the gas productivity deduction increases as the WGR increases.By the end of the data analysis,two linear equations indicating the relationship between gas productivity and reservoir pressure and the relationship between gas productivity and the water gas ratio are obtained:QAOF?A1lnWGRB1 and QAOF?A2lnPB2,respectively. | Xiaoliang Huang Xiao Guo Xinqian Lu Xiang Zhou Zhilin Qi Wende Yan Jiqiang Li | 2018 | Petroleum2018，4，2： | 4 |
| 8 | The type, position and age effect on the cutting reproduction of Picea crassifolia and its rooting mechanism in the Qilian Mountains显示文摘Picea crassifolia Kom, a perennial arbor species is recognized as one of the most adaptable plants found to date in Qilian Mountains. To explore the cutting reproduction technology of P. crassifolia and reveal its rooting mechanism, cuttings of P. crassifolia with different cutting types(softwood, hardwood and root), positions(top, upper, middle and bottom) and ages(7, 10, 15, 20,25 year-old) were cultivated in a field experiment. Oneyear old softwood and hardwood cuttings were collected from 7-, 10-, 15-, 20-, and 25 year-old healthy ortets to analyze the changes from endogenous hormones and organic nutrients. Results indicate that the softwood cuttings(0.5–1.0 cm in diameter) from upper branches of15 year-old ortets shows better growth performance by improving rooting indexes, including a significant increase in rooting rate and a decrease in basal rot rate. Concomitantly, increasing rooting quantity and root length also increased. It is noteworthy that the high rooting rate of P.crassifolia cuttings due to its ability to accumulate high concentrations of indole-3-acetic acid(IAA) and total carbon(TC) rather than abscisic acid(ABA) and total nitrogen(TN). The rooting rate was mainly regulated by the IAA/ABA and TC/TN ratio. In summary, our results suggest that the softwood cuttings(0.5–1.0 cm in diameter)from upper branches of 15 year-old P. crassifolia can be considered as an effective strategy to improve cutting rooting rate, and the IAA/ABA and TC/TN ratio was one of the main factors limiting the cutting rooting rate of P.crassifolia. | Jianjun Kang Wenzhi Zhao Ming Zhao Guangyu Li Jiqiang Zhang Zhisheng Zhang | 2015 | Journal of Forestry Research2015，26，4： | 4 |
| 9 | Influences of different Zr/Sc ratios on microstructure and mechanical properties of Al-2Si alloy显示文摘The influences of different Zr/Sc ratios on the microstructural evolution and mechanical performances of Al-2 Si alloy were investigated in this paper.The as-cast samples were characterized and analyzed by the scanning electron microscope(SEM)with an energy dispersive spectrometer(EDS)to indicate the refining effect of the different Zr/Sc ratios on theα-Al and Si phases in Al-2 Si alloy.The results indicate that theα-Al phases are refined from coarse dendritic structure to relatively fine equiaxed grains when the Zr/Sc ratio is equal to 1:1.Meanwhile,the eutectic Si phase in Al-2 Si-0.2 Zr-0.2 Sc alloy is modified from the coarse plate and needle to fine fiber and partial granular structure,and the average roundness of eutectic Si is decreased by 75%from 16 to 4.With the refinement ofα-Al phases and the modification of eutectic Si structure,the ultimate tensile strength(UTS)is improved by 53%and the elongation(EL)is increased by 64%when the Zr/Sc ratio is equal to 1:1.In addition,the UTS decreases and EL is enhanced with the increase of tensile temperature.Moreover,the fracture model of Al-2 Si-0.2 Zr-0.2 Sc alloy in250℃changes into the ductile fracture. | Qinglin Li Xiaodong Ma Binqiang Li Jiqiang Ma Xiangyu Feng Ruijie Pei Jianjun Liu | 2021 | Journal of Rare Earths2021，39，1： | 3 |
| 10 | Research on a New Fiber-Optic Axial Pressure Sensor of Transformer Winding Based on Fiber Bragg Grating显示文摘基于纤维布拉格栅栏的原则,为变压器弯屈的轴的力量测量的光纤的压力传感器的一种新类型被设计,它与把板横梁,包装过程的优化,和传感器的材料弄弯的结构被设计。通过刻度试验校准传感器, Taikai 变压器工厂的地测试结果证明传感器的敏感是 0.133 pm/kPa,重覆性错误是 2.7% FS。在不同位置的光纤的压力传感器的数据维持一致、可重复,它能满足变压器弯屈的轴的力量的即时监视的要求。 | Yuan LIU Lianqing LI Lin ZHAO Jiqiang WANG Tongyu LIU | 2017 | Photonic Sensors2017，7，4： | 2 |
| 11 | Mullite Coating on Recrytallized Silicon Carbide and Its Cycling Oxidation Behavior显示文摘Mullite coating on recrystallized silicon carbide was successfully prepared by the sol-gel route. The cycling oxidation of coated recrystallized silicon carbide was performed at 1500℃. For comparison, the oxidation of uncoated recrystallized silicon carbide was also carried out at the same condition. The results indicated that a layer of compact, adhesive and crack free mullite coating was found on the recrystallized silicon carbide. After oxidation, the new coatings exhibit adherence and crack resistance under thermal cycling between room temperature and 1500℃, therefore the oxidation resistance capability of silicon carbide was enhanced. With the increase of the dipping frequencies, namely, the increase of the thickness of mullite coating, the oxidation resistance of silicon carbide would be further improved. The formation mechanism of mullite coating was analyzed and discussed and the oxidation dynamics model of coated-mullite silicon carbide has been also proposed. | LI Shibin RU Hongying GAO Jiqiang JIN Zhihao | 2006 | China's Refractories2006，15，2： | 2 |
| 12 | Synthesis of selective PAK4 inhibitors for lung metastasis of lung cancer and melanoma cells显示文摘The p21 activated kinase 4(PAK4) is serine/threonine protein kinase that is critical for cancer progression.Guided by X-ray crystallography and structure-based optimization,we report a novel subseries of C-3-substituted 6-ethynyl-1 H-indole derivatives that display high potential and specificity towards group Ⅱ PAKs.Among these inhibitors,compound 55 exhibited excellent inhibitory activity and kinase selectivity,displayed superior anti-migratory and anti-invasive properties against the lung cancer cell line A549 and the melanoma cell line B16.Compound 55 exhibited potent in vivo antitumor metastatic efficacy,with over 80% and 90% inhibition of lung metastasis in A549 or B16-BL6 lung metastasis models,respectively.Further mechanistic studies demonstrated that compound 55 mitigated TGF-β1-induced epithelial-mesenchymal transition(EMT). | Peilu Song Fan Zhao Dahong Li Jiqiang Qu Miao Yao Yuan Su Hanxun Wang Miaomiao Zhou Yujie Wang Yinli Gao Feng Li Dongmei Zhao Fengjiao Zhang Yu Rao Mingyu Xia Haitao Li Jian Wang Maosheng Cheng | 2022 | Acta Pharmaceutica Sinica B2022，12，6： | 2 |
| 13 | Cytocompatibility of High Nitrogen Nickel-Free Stainless Steel for Orthopedic Implants显示文摘Cytocompatibility of high nitrogen nickel-free stainless steel(HNS) with different nitrogen content was evaluated and compared with a conventional austenitic stainless steel 317L.The MTT assay(3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) was performed on MG63 osteoblasts to assess the cytotoxicity.The expression of selected marker typical of differentiated osteoblasts,such as alkaline phosphatase activity(AKP),was also monitored in MG63 cells cultured on the tested materials.As a result,HNS had higher cell growth than 317L;meanwhile the cytocompatibility was increased with increasing nitrogen content.Furthermore,HNS enhanced osteoblasts differentiation,as confirmed by AKP activity.Overall these facts indicated that HNS had higher cytocompatibility than 317L and the nitrogen content contributed to the higher cytocompatibility of HNS.The influence of nitrogen on surface energy further explained the cytocompatibility of HNS. | Tianchi Ma Peng Wan Yuyan Cui Guirong Zhang Jiqiang Li Jihui Liu Yibin Ren Ke Yangg Li Lu | 2012 | Journal of Materials Science & Technology2012，28，7： | 2 |
| 14 | Pencil-beam scanning catheter for intracoronary optical coherence tomography显示文摘Current gradient-index(GRIN)lens based proximal-driven intracoronary optical coherence tomography(ICOCT)probes consist of a spacer and a GRIN lens with large gradient constant.This design provides great flexibility to control beam profiles,but the spacer length should be well controlled to obtain desired beam profiles and thus it sets an obstacle in mass catheter fabrication.Besides,although GRIN lens with large gradient constant can provide tight focus spot,it has short depth of focus and fast-expanded beam which leads to poor lateral resolution for deep tissue.In this paper,a type of spacer-removed probe is demonstrated with a small gradient constant GRIN lens.This design simplifies the fabrica-tion process and is suitable for mass production.The output beam of the catheter is a narrow nearly collimated light beam,referred to as pencil beam here.The full width at half maximum beam size varies from 35.1μm to 75.3μm in air over 3-mm range.Probe design principles are elaborated with probe/catheter fabrication and performance test.The in vivo imaging of the catheter was verified by a clinical ICOCT system.Those results prove that this novel pencil-beam scanning catheter is potentially a good choice for ICOCT systems. | Jiqiang Kang Rui Zhu Yunxu Sun Jianan Li Kenneth K.Y.Wong | 2022 | Opto-Electronic Advances2022，5，3： | 2 |
| 15 | Fabrication of YBCO superconducting microarray by sol-gel process using photosensitive metal chelates显示文摘We used yttrium acetate, barium acetate, and copper acetate as the starting materials, benzalacetone (BzAcH) as chemical modifier, and methanol (MEOH) as solvent to synthesize a stable fluorine-free YBCO precursor sol. The coated YBCO gel film using this precursor sol exhibited photosensitivity to UV irradiation at a wavelength of 330 nm. After the subsequent exposing, the YBCO gel film showed a decreased solubility in several organic solvents. Based on the photosensitivity of the YBCO/BzAcH gel film, YBCO superconducting microarray with the pitch of 5 μm was fabricated by irradiating the gel film with UV light through a mask, followed by leaching the unirradiated area in a mixture solvent of methanol and n-butyl alcohol with the volume ratio of 1:1. After proper heat treatment the x-ray diffraction result showed that the as-prepared arrays were highly c-axis oriented and with a high T c by this new photosensitive sol-gel process. | ZHAO GaoYang JIA JiQiang JIANG Fen LEI Li MA JunShan | 2013 | Science China(Technological Sciences)2013，56，6： | 2 |
| 16 | Methods of Measuring and Decomposing the Income Gap: A Survey显示文摘本文按研究对象将收入差距划分为总体收入差距和组群收入差距两大类,从收入不平等、极化和组群收入差距三个层面梳理了收入差距的测度及其分解方法。其中,收入不平等侧重于对总体收入差距的刻画;极化着眼于收入分布中的“聚集”或“扎堆”现象,其衡量指标大体上可分为两极分化测度指标和多极分化测度指标。在收入差距的分解上,Shapley分解和组群收入差距的分布分解方法都是较为前沿的研究领域。文章还强调了各种收入差距衡量指标或分解方法的适用性和针对性,以便有的放矢地选用合适的相关指标和方法,更精准地探寻收入差距的成因。 | Guo Jiqiang Jiang Li Lu Lili Ye Rongde Fei Shulan | 2011 | Social Sciences in China2011，32，3： | 2 |
| 17 | Realization of high-performance tri-layer graphene saturable absorber mirror fabricated via a one-step transfer process显示文摘Graphene,as a saturable absorber(SA),has attracted much attention for its application in ultrashort pulse fiber lasers due to its ultrafast interband carrier relaxation and ultra-broadband wavelength operation.Nevertheless,during the stacking process of monolayer graphene layer,the induced nonuniform contact at the interface of graphene layers deteriorate the device performance.Herein,we report the fabrication of graphene saturable absorber mirrors(SAMs)via a one-step transfer process and the realization of the much enlarged modulation depth and the much reduced nonsaturable loss with tri-layer graphene(TLG)than single-layer graphene(SLG)due to the improved uniform contact at the interface.Moreover,the operation of 1550 nm mode-locked Er-doped fiber laser with the TLG SAM exhibits excellent output characteristics of the maximum output power of 9.9 mW,a slope efficiency of 2.4%and a pulse width of 714 fs.Our findings are expected to pave the way toward high-performance ultrashort pulse fiber lasers based on graphene SAs. | Cheng Jiang Xu Wang Jian Liu Jiqiang Ning Changcheng Zheng Xiaohui Li Ziyang Zhang | 2020 | Journal of Semiconductors2020，41，1： | 2 |
| 18 | Raster to vector conversion of construction engineering drawings显示文摘 | Jiqiang Song Feng Su Heng Li | 2002 | Automation in Construction2002，11，5： | 1 |
| 19 | Dual-responsive nanovaccine for cytosolic delivery of antigens to boost cellular immune responses and cancer immunotherapy显示文摘Cancer vaccine contributing to the success of the treatment and prevention of tumors has attracted a huge attention as a strategy for tumor immunotherapy in recent years.A major challenge of cancer vaccine is to target cytosols of dendritic cells(DCs)in the lymph nodes(LNs)to enhance efficiency of antigen cross-presentation,which elicits high levels of cytotoxic T-lymphocytes to destruct tumor cells.Here,we address this issue by conjugating ovalbumin(OVA)to PEG-PCL using disulfide bond(-ss-),and the degradable pH-responsive polymer-PEI-PCL as delivery carrier.In addition,the mol ratio of PEG-PCL to PEI-PCL in the mixed micelles was tailored to deliver the OVA to LNs.Subsequently,CpG ODN_(1826),a TLR-9 agonist,was further introduced into a mixed micelle of 30nm or less as a unique tumor vaccine.Importantly,the results demonstrated the mixed micelles with 1:1mol of PCL-PEG and PCL-PEI can effectively migrate to distal LNs where antigen were efficiently captured by DCs,meanwhile,OVA was modified to the surface of mixed micelles via disulfide bonds(-ss-)for promotion efficiency of antigen cross-presentation.More surprisingly,combination of tumor vaccine with anti-PD-1,the therapy of ectopic melanoma(B16-OVA)and lung metastasis melanoma(B16-OVA)is excellent therapeutic effect.Taken together,our works offers a novel strategy for the cytosol delivery of antigens to achieve potent cancer immunotherapy. | Yang Sui Ji Li Jiqiang Qu Ting Fang Hongyan Zhang Jian Zhang Zheran Wang Mingyu Xia Yinghui Dai Dongkai Wang | 2022 | Asian Journal of Pharmaceutical Sciences2022，17，4： | 1 |
| 20 | High temperature tribological behavior of a Ti-46Al-2Cr-2Nb intermetallics显示文摘 | Jun Cheng Jun Yang Xinghua Zhang Hong Zhong Jiqiang Ma Fei Li Licai Fu Qinling Bi Jinshan Li Weimin Liu | 2012 | Intermetallics2012，，： | 1 |
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