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| 1 | Coupling effects of tungsten and molybdenum on microstructure and stress-rupture properties of a nickel-base cast superalloy显示文摘In order to comprehensively understand the forming mechanism of abnormal phases solidified in a nickel-base cast superalloy with additives of tungsten and molybdenum, the coupling effects of W and Mo on the microstructure and stress-rupture properties were investigated in this paper. The results indicated that the precipitation of primary α-(W, Mo) phase depended tremendously on the amount of W and Mo addition. When the total amount of W and Mo was greater than 5.79 at%, α-(W, Mo) phase became easily precipitated in the alloy.With increasing of Mo/W ratio, the dendrite-like α-(W, Mo) phases were apt to convert into small bars or blockylike phases at the vicinities of γ′/γ eutectic. The morphological changes of α-(W, Mo) phase can be interpreted as the non-equilibrium solidification of W and Mo in the alloy. Since the large sized α-(W, Mo) phase has detrimental effects on stress-rupture properties in as-cast conditions, secondary cracks may mainly initiate at and then propagate along the interfaces of brittle phases and soft matrix. During exposing at 1100 ℃ for 1000 h, the α-(W, Mo) phases transformed gradually into bigger and harder M_6C carbide, which results in decreasing of stress-rupture properties of the alloy. Finally, the alloy with an addition of 14W-1Mo(wt%) maintained the longest stress lives at high temperatures and therefore it revealed the best microstructure stability after 1100 ℃/1000 h thermal exposure. | Tongjin Zhou Wei Feng Huibin Zhao Yu Meng Huaxia Zhang Hongsheng Ding Zichen Wang | 2018 | Progress in Natural Science:Materials International2018，28，1： | 7 |
| 2 | In situ synthesis and modification of calcium carbonate nanoparticles via a bobbling method显示文摘Modified calcium carbonate (CaCO3) nanoparticles with cubic- and spindle-like configuration were synthesized in situ by the typical bobbling (gas-liquid-solid) method. The modifiers, such as sodium stearate, octadecyl dihydrogen phosphate (ODP) and oleic acid (OA), were used to obtain hydrophobic nanoparticles. The different modification effects of the modifiers were investigated by measuring the active ratio, whiteness and the contact angle. Moreover, transmission electron microscopy (TEM), X-ray diffraction (XRD) and thermogravimetry analysis (TGA analysis) were employed to characterize the obtained products. A preliminary reaction mechanism was discussed. According to the results, the active ratio of CaCO3 modified by ODP was ca. 99.9% and the value of whiteness was 97.3% when the dosage of modifiers reached 2%. The contact angle was 122.25° for the CaCO3 modified in the presence of sodium stearate, ODP and OA. When modified CaCO3 was filled into PVC, the mechanical properties of products were improved greatly such as rupture intensity, pull intensity and fuse temperature. The compatibility and affinity between the modified CaCO3 nanoparticles and the organic matrixes were greatly improved. | ZHAO LiNa FENG JingDong WANG ZiChen | 2009 | Science China Chemistry2009，52，7： | 5 |
| 3 | Aberrant seed development in Litchi chinensis is associated with the impaired expression of cell wall invertase genes显示文摘Cell wall invertase(CWIN)are known to play important roles in seed development.However,most reports to date have focused on a single gene family member,and have mainly investigated CWIN functions during the filling stage of seed development.In this study,we found significant lower levels of CWIN protein and activity associated with seed abortion in the Litchi chinensis cultivar“Nuomici.”We identified five litchi CWIN genes and observed that the expression of LcCWIN5 was limited to the flower tissues and decreased sharply with fruit development.Silencing of LcCWIN5 expression before 28 DAA(cell division stage)resulted in perturbed liquid endosperm development,smaller seeds,and higher seed abortion rate,while silencing after 28 DAA(filling stage)had no effect on seed development.In contrast,LcCWIN2 was mostly expressed in the funicle and seed coat,and increased with fruit development.Decreased LcCWIN2 expression and CWIN activity during early seed filling coincided with smaller seeds in the cultivar“Feizixiao.”Silencing of LcCWIN2 caused a reduction in the seed size without inducing seed abortion.We propose that CWIN activity in seed maternal tissues during cell division stage is likely due to LcCWIN5 expression,which regulates early seed development.On the other hand,CWIN activity during the filling stage is due to the expression of LcCWIN2,which may promote carbon import by creating a sucrose gradient.Comparable LcCWIN5 expression,but much lower CWIN activity,detected in the funicle of“Nuomici”is consistent with post-translational regulation. | Jieqiong Zhang Zichen Wu Fuchu Hu Lian Liu Xuming Huang Jietang Zhao Huicong Wang | 2018 | Horticulture Research2018，5，1： | 4 |
| 4 | Elastic Wave Propagation in Lattice Metamaterials with Koch Fractal显示文摘In this study,the wave propagation properties of lattice metamaterials with Koch fractal structures are investigated in terms of band structures and directional wave propagation.The analytical models of lattice metamaterials are established using the finite element method,and the dispersion relation is solved using the Bloch’s theorem.The band structures of the lattice metamaterials with different numbers of iterations are studied,and the group velocities at a selected frequency are calculated to analyze the directional wave propagation characteristics.Furthermore,dynamic responses of the finite structures are calculated using commercial finite element software to verify the band gaps and directional wave propagation behaviors in the lattice metamaterials.The results show that multiple and low band gaps are present in the lattice materials with various geometric parameters of the Koch fractal,and the position of the lowest band gap decreases as the number of iterations increases.The results indicate the potential applications of lattice metamaterials with Koch fractals for vibration isolation and multi-functional design. | Pengcheng Zhao Kai Zhang Zichen Deng | 2020 | Acta Mechanica Solida Sinica2020，33，5： | 4 |
| 5 | Multi-resonator coupled metamaterials for broadband vibration suppression显示文摘In this study,multi-resonator coupled metamaterials(MRCMs)with local resonators are proposed to obtain the multiple and wide band gaps.Kinetic models of the MRCMs are established,and the boundary conditions of the unit cell are obtained with Bloch's theorem.The effects of structural parameters,including the mass of the resonator and the spring stiffness,on the distributions of the band gaps are studied.Furthermore,the frequency domain responses and the time domain responses are calculated for analyzing the structural vibration characteristics and the effects of damping on structural vibration.The results show that the frequency domain response can accurately express the distributions of the band gaps of the MRCMs,and we can increase the number and the width of the band gaps by using the MRCMs for the superior vibration suppression capability. | Pengcheng ZHAO Kai ZHANG Cheng ZHAO Zichen DENG | 2021 | Applied Mathematics and Mechanics(English Edition)2021，42，1： | 3 |
| 6 | Theoretical and Applied Mechanics Letters显示文摘The placement of pressure taps on the surface of the wind tunnel test model is an important means toobtain the surface pressure distribution.However,limited by space location and experimental cost,it isdifficult to arrange enough pressure measuring taps on the surface of complex models to obtain completepressure distribution information,thus it is impossible to obtain accurate lift and moment characteristicsthrough integration.The paper proposes a refined reconstruction method of airfoil surface pressure basedon compressed sensing,which can reconstruct the pressure distribution with high precision with lesspressure measurement data.Tests on typical airfoil subsonic flow around flow show that the accuracyof lift and moment after the pressure integration reconstructed by 4-8 measuring points can meet therequirements of the national military standard.The algorithm is robust to noise,and provides a new ideafor obtaining accurate force data from sparse surface pressure tests in engineering. | Xuan Zhao Lin Du Xuhao Peng Zichen Deng Weiwei Zhang | 2021 | Theoretical & Applied Mechanics Letters2021，11，2： | 2 |
| 7 | 12-Tungstophosphoric acid niched in Zr-based metal-organic framework:a stable and efficient catalyst for Friedel-Crafts acylation显示文摘Heteropoly acids(HPA) are well known for their versatile solid acid catalysis in diverse chemical reactions, however they suffer from low surface area(<10 m^2/g) and leaching into the reactions media, which reduce their prospects as industrial catalyst.Herein, a novel hybrid material HPW@Zr-BTC,composed of 12-tungstophoric acid(HPW) and Zr^(Ⅳ)-benzene tri-carboxylate(Zr-BTC) metal-organic framework(MOF), was prepared via one-pot solvothermal method. Excellent HPW loading up to 32.3 wt% was achieved, and HPW@Zr-BTC composite proved to be highly stable, besides the crystalline morphology of Zr-BTC was intact. The catalytic activity of the hybrid composite was explored via Friedel-Crafts acylation of anisole with benzoyl chloride.The 28.2 wt% HPW@Zr-BTC showed excellent catalytic performance, with 99.4% anisole conversion and 97.6% yield(pmethoxybenzophenone) under solvent free conditions. Excellent retention of catalytic activity was achieved after at least five consecutive runs due to non-observable HPW leaching. The promising activity and stability of the catalyst forecasted its potential industrial applications. | Latif Ullah Guoying Zhao Zichen Xu Hongyan He Muhammad Usman Suojiang Zhang | 2018 | Science China Chemistry2018，61，4： | 2 |
| 8 | Bioactive polydimethylsiloxane surface for optimal human mesenchymal stem cell sheet culture显示文摘Human mesenchymal stem cell(hMSC)sheets hold great potential in engineering three-dimensional(3D)completely biological tissues for diverse applications.Conventional cell sheet culturing methods employing thermoresponsive surfaces are cost ineffective,and rely heavily on available facilities.In this study,a cost-effective method of layer-by-layer grafting was utilized for covalently binding a homogenous collagen I layer on a commonly used polydimethylsiloxane(PDMS)substrate surface in order to improve its cell adhesion as well as the uniformity of the resulting hMSC cell sheet.Results showed that a homogenous collagen I layer was obtained via this grafting method,which improved hMSC adhesion and attachment through reliable collagen I binding sites.By utilizing this low-cost method,a uniform hMSC sheet was generated.This technology potentially allows for mass production of hMSC sheets to fulfill the demand of thick hMSC constructs for tissue engineering and biomanufacturing applications. | Zichen Qian David Ross Wenkai Jia Qi Xing Feng Zhao | 2018 | Bioactive Materials2018，3，2： | 2 |
| 9 | Open surgery in the era of minimally invasive surgery显示文摘The benefits and popularity of minimally invasive surgery are undeniable around the globe.However,open surgery is necessary and learning open surgery skills is still a necessity.Open surgery allows for better exposure to the surgical field and provides tactile sensation to facilitate the stereo visual assessment to precisely remove the lesion.Open surgery is still the key to surgical training,and the skills learned from open surgeries remain crucial for unforeseen circumstances and certain conditions like emergencies,challenge cases,or patients with compromised status. | Zichen Zhao Jin Gu | 2022 | Chinese Journal of Cancer Research2022，34，1： | 1 |
| 10 | Morphological control of Cu 2 O micro-nanostructure film by electrodeposition显示文摘 | Fang Sun Yupeng Guo Wenbo Song Jingzhe Zhao Lanqin Tang Zichen Wang | 2007 | Journal of Crystal Growth2007，，2： | 1 |
| 11 | Fabrication and characterization of electrospun biocompatible PU/PEGMA hybrid nanofibers by in-situ UV photopolymerization显示文摘Poly(ethylene glycol) methacrylate (PEGMA) was introduced into a polyurethane (PU) solution in order to prepare hemocompatible electrospun membranes for potential application as small diameter vascular scaffolds. Crosslinked PU/PEGMA hybrid nanofibers were fabricated by a reactive electrospinning process with N,N′-methylenebisacrylamide (MBAm) as crosslinker and benzophenone (BP) as photoinitiator. The photoinduced polymerization and crosslinking reaction took place simultaneously during the electrospinning process. No significant difference in the membrane morphology was found by SEM when PEGMA content was less than 20 wt%. The crosslinked fibrous membranes of PU/PEGMA exhibit higher hydrophilicity and mechanical strength than PU membrane. These nanofibrous membranes are potential substitutes for artificial vascular scaffolds. | WANG HeYun FENG YaKai YUAN WenJie ZHAO HaiYang FANG ZiChen KHAN Musammir GUO JinTang | 2012 | Science China(Physics,Mechanics & Astronomy)2012，55，7： | 1 |
| 12 | The synthesis and characterization of TiO2/wollastonite composite 显示文摘 | ZHAO Jingzhe WANG Zichen WANG Liwei | 1998 | MaterLett1998，37，： | 1 |
| 13 | 显示文摘 | Shuangxi Xing Chun Zhao Shengyu Jing Zichen Wang | 2006 | Polymer2006，47，： | 1 |
| 14 | 显示文摘 | Shuangxi Xing Chun Zhao Shengyu Jing Zichen Wang | 2006 | Polymer2006，47，： | 1 |
| 15 | Silica nanoparticles encapsulated by polystyrene via surface grafting and in situ emulsion polymerization显示文摘 | Xuefeng Ding Jingzhe Zhao Yanhua Liu Hengbin Zhang Zichen Wang | 2004 | Materials Letters2004，，25： | 1 |
| 16 | The preparation and mechanism studies of porous titania显示文摘 | Zhao Jingzhe Wang Zichen Wang Liwei | 2000 | Materials Chemistry and Physics2000，63，： | 1 |
| 17 | Synthesis and characterization of polyurethane/SiO2 nanoeomposites 显示文摘 | Gao Xiaoyan Zhu Yanchao Zhao Xu Wang Zichen An Dongmin Ma Yuejia | 2011 | Applied Surface Science2011，25，： | 1 |
| 18 | Synthesis of self-assembled needle-shaped calcium carbonate superstructures显示文摘Novel self-assembled calcium carbonate(CaCO3)crystals exhibiting the morphology of well-defined needles were synthesized by a simple precipitation reaction in the presence of octadecyl dihydrogen phosphate(ODP)as a crystal additive.The CaCO3 obtained by this method is hydrophobic,making it likely to be used widely in industry.The resulting products were characterized by powder X-ray diffraction,field emission scanning electron microscopy,Fourier transform infrared spectroscopy and contact angle experiments.The results indicated that ODP plays an important role in determining the structure,morphology and hydrophobicity of CaCO3 crystals. | ZHAO LiNa FENG JingDong WANG XiuYan WANG ZiChen | 2010 | Chinese Science Bulletin2010，55，20： | 1 |
| 19 | 显示文摘 | Wang Liwei Wang Zichen Zhao Jingzhe | 1999 | Materials Chemistry and Physics1999，59，： | 1 |
| 20 | Engineering Sodium Metal Anode with Sodiophilic Bismuthide Penetration for Dendrite-Free and High-Rate Sodium-Ion Battery显示文摘Sodium(Na)metal batteries with a high volumetric energy density that can be operated at high rates are highly desirable.However,an uneven Na-ion migration in bulk Na anodes leads to localized deposition/dissolution of sodium during high-rate plating/stripping behaviors,followed by severe dendrite growth and loose stacking.Herein,we engineer the Na hybrid anode with sodiophilic Na_(3)Bi-penetration to develop the abundant phase-boundary ionic transport channels.Compared to intrinsic Na,the reduced adsorption energy and ion-diffusion barrier on Na_(3)Bi ensure even Na^(+)nucleation and rapid Na^(+)migration within the hybrid electrode,leading to uniform deposition and dissolution at high current densities.Furthermore,the bismuthide enables compact Na deposition within the sodiophilic framework during cycling,thus favoring a high volumetric capacity.Consequently,the obtained anode was endowed with a high current density(up to 5 mA∙cm^(−2)),high areal capacity(up to 5 mA∙h∙cm^(−2)),and long-term cycling stability(up to 2800 h at 2 mA∙cm^(−2)). | Wanyu Zhao Min Guo Zhijun Zuo Xiaoli Zhao Huanglin Dou Yijie Zhang Shiying Li Zichen Wu Yayun Shi Zifeng Ma Xiaowei Yang | 2022 | Engineering2022，8，4： | 0 |
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