|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Sediment loads response to climate change:A preliminary study of eight large Chinese rivers显示文摘Climate change characterized by increasing temperature is able to affect precipitation regime and thus surface hydrology.However,the manner in which river sediment loads respond to climate change is not well understood,and related assessment regarding the effect of climate change on sediment loads is lacking.We present a quantitative estimate of changes in sediment loads(from 1.5 Gt yr^(-1) pre-1990 to 0.6 Gt yr^(-1) from 1991-2007) in response to climate change in eight large Chinese rivers.Over the past decades,precipitation change coupled with rising temperatures has played a significant role in influencing the sediment delivery dynamics,although human activities, such as reservoir construction,water diversion,sand mining and land cover change,are still the predominant forces. Lower precipitation coupled with rising temperatures has significantly reduced sediment loads delivered into the sea in semi-arid climates(4-61%).In contrast,increasingly warmer and wetter climates in subtropical zones has yielded more sediment(0.4-11%),although the increase was offset by human impact.Our results indicate that,compared with mechanical retention by reservoirs,water reduction caused by climate change or human withdrawals has contributed more sediment reduction for the rivers with abundant sediment supply but limited transport capacity(e.g.,the Huanghe).Furthermore,our results indicate that every 1%change in precipitation has resulted in a 1.3%change in water discharge and a 2%change in sediment loads.In addition,every 1%change in water discharge caused by precipitation has led to a 1.6%change in sediment loads,but the same percentage of water discharge change caused largely by humans would only result in a 0.9%change in sediment loads.These figures can be used as a guideline for evaluating the responses of sediment loads to climate change in similar climate zones because future global warming will cause dramatic changes in water and sediment in river basins worldwide at rates previously unseen. | X.X.LU L.S.RAN S.LIU T.JIANG S.R.ZHANG J.J.WANG | 2013 | International Journal of Sediment Research2013，28，1： | 14 |
| 2 | Shape Memory Effect,Thermal Expansion and Damping Property of Friction Stir Processed NiTip/Al Composite显示文摘NiTi particles reinforced aluminum(NiTip/Al) composite was prepared via friction stir processing,eliminating interfacial reaction and/or elemental diffusion.The NiTip in the composite maintained the intrinsic characteristic of a reversible thermoelastic phase transformation even after heat-treatment.The shape memory characteristic of the NiTip decreased the coefficient of thermal expansion of the Al matrix,and an apparent two-way shape memory effect was observed in the composite.The composite owned a good combination of adjustable damping and thermal physical properties. | D.R.Ni J.J.Wang Z.Y.Ma | 2016 | Journal of Materials Science & Technology2016，32，2： | 5 |
| 3 | Clinical significance of VEGF, ER and AR expression in seminoma显示文摘Objective:To evaluate the expression of vascular endothelial growth factor (VEGF),estrogen receptor(ER) and androgen receptor(AR) in the genesis and development of seminoma.Methods:The expression of VEGF,ER and AR was assayed by means of immuno-histochemical technique in 16 cases of seminoma and 10 cases of prostatic cancer (Pca).Results:The VEGF expression positive rate was significantly higher(P<0.05) in seminoma than in Pca,being 14/16(87.5%) and (4/10,40%),respectively.The AR expression positive rate was lower(P>0.05) in seminoma (9/16,56.2%) than in Pca(9/10,90%).The ER expression was negative in all the seminoma and Pca patients .Conclusion:In Seminoma,the expression of VEGF is significantly increased,which may play a role in the genesis and development of the neoplasm. | J.Z. Wang, P.D. Mao, D.L. Zeng, J.J.Wang, X.Y. Xie, Z.J. Zhu, J.Y. Zhou Affiliated Hospital of North Sichuan Medical College, Nanchong, Sichuan 637000, China | 2002 | Asian Journal of Andrology2002，4，4： | 4 |
| 4 | Novel ternary Ag/CeVO_4/g-C_3N_4 nanocomposite as a highly efficient visible-light-driven photocatalyst显示文摘The CeVO_4/graphitic C_3N_4 composites have exhibited much enhanced photocatalytic property for degrading methylene blue(MB) pollutant under visible light irradiation compared with single-phase g-C_3N_4 or CeVO_4. The composite S5 obtained from an optimized mass ratio(5%) of CeVO_4 to dicyanamide(DCDA) exhibits the highest photocatalytic activity. Here, ternary Ag/CeVO_4/g-C_3N_4 composites denoted as X%Ag/S5 were prepared by an ultrasonic precipitation method to improve the photocatalytic property of S5. The TEM images show that CeVO_4 and Ag nanoparticles are well distributed on the layered g-C_3N_4, which agree well with the XRD results. The UV spectra show that the 7%Ag/S5 sample has the widest absorption range and the enhanced absorption intensity under visible light irradiation. The corresponding band gap of 7%Ag/S5(2.5 eV) is much lower than that of S5(2.65 eV). The corresponding k value of 7%Ag/S5 is much higher than those of g-C_3N_4 and CeVO_4. The degradation experiments for MB solution suggest that the 7%Ag/S5 sample has the optimal photocatalytic performance, which can degrade MB solution completely within 120 min. The enhanced photocatalytic property of the composites is ascribed to not only the effect of heterojunction structure, but also the surface plasma resonance effect of Ag nanoparticles. | J.REN Y.Z.WU J.M.PAN X.H.YAN M.CHEN J.J.WANG D.F.WANG C.ZHOU Q.WANG X.N.CHENG | 2018 | Journal of Advanced Ceramics2018，7，1： | 3 |
| 5 | Evolution of deformation twins with strain rate in a mediummanganese wear-resistant steel Fe-8Mn-1C-1.2Cr-0.2V显示文摘Microstructure evolutions of the medium-manganese wear-resistant steel Fe-8Mn-1C-1.2Cr-0.2V (in wt.%) with stacking-fault energy of 22 mJ m-2 during deformation at strain rate ranging of 10^-2-1 s^-1 were analyzed by means of X-ray diffraction, field emission scanning electron microscopy and high-resolution transmission electron microscopy. The results indicate that the twinning-induced plasticity effect is the main strengthening mechanism of the studied steel, whilst the transformation-induced plasticity effect only occurs at high strain rate. With an increase in strain rate, volume fraction of the deformation twins, in particular that of the secondary twins, increases significantly along with decreasing average size. When applied strain rate is higher than 10^-1 s^-1, the parallel deformation twins are turned into a crossing morphology, and the original straight twin boundaries exhibit a ladder feature, which is attributed to the interactions between regular dislocations and twin dislocations at the twin boundary. The critical strain, a key indicator of the initiation of deformation twin, decreases with increasing strain rate. In addition, the ductility and strength of medium-manganese wear-resistant steel Fe-8Mn-1C-1.2Cr-0.2V are mainly determined by the shape and volume fraction of deformation twins. | J. Chen J.J.Wang H.Zhang W.G.Zhang C.M.Liu | 2019 | Journal of Iron and Steel Research(International)2019，26，9： | 2 |
| 6 | Construction of hybrid Z-scheme graphitic C_(3)N_(4)/reduced TiO_(2) microsphere with visible-light-driven photocatalytic activity显示文摘A novel Z-scheme graphitic C_(3)N_(4)/reduced TiO_(2)microsphere(g-C_(3)N_(4)/r-TiO_(2))has been successfully synthesized by a solvothermal method.The as-prepared samples with different contents of g-C_(3)N_(4)were characterized by X-ray diffraction,electron paramagnetic resonance,scanning electron microscope,UV evis.diffuse reflectance and photoluminescence spectra.The r-TiO_(2)microspheres are aggregated on the surface of g-C_(3)N_(4)sheets in the as-prepared g-C_(3)N_(4)/r-TiO_(2)composites.All g-C_(3)N_(4)/r-TiO_(2)catalysts show enhanced photocatalytic activity for the degradation of rhodamine B under visible light irradiation.It could be attributed to these influences of oxygen vacancy(changing the band gap of TiO_(2)),the large specific surface area(providing much more active sites for photocatalytic reaction),and the synergetic effect between g-C_(3)N_(4)and r-TiO_(2)(promoting the separation for photoinduced electron-hole pairs).Moreover,the Z-scheme carriers transfer mechanism in the photocatalytic process has been discussed through trapping experiments of active species.The work demonstrates the strategies of the construction of Z-scheme carriers transfer system,the introduction of oxygen vacancy and structure designing are beneficial to design materials toward solar energy conversion like contaminant degradation. | C.Zhou N.F.Ye X.H.Yan J.J.Wang J.M.Pan D.F.Wang Q.Wang J.X.Zu X.N.Cheng | 2018 | Journal of Materiomics2018，4，3： | 2 |
| 7 | Multistage serrated flow behavior of a medium-manganese high-carbon steel显示文摘The deformation mechanisms and the flow stress behavior of a medium-manganese high-carbon steel during cold deformation at a strain rate of 10×5 s^-1 were explored using a universal testing machine,an X-ray diffractometer,a field emission scanning electron microscope and a high-resolution transmission electron microscope.The results show that continuous step-up serrated flow behavior appears after the yielding point,and the true stress-strain curve is roughly divided into five stages based on distinctive densities and amplitudes of serration.The strengthening mechanisms of the experimental steel involve Cottrell atmosphere,twinning-induced plasticity(TWIP)efect and transformation-induced plasticity(TRIP)effect.TWIP effect is the dominant deformation mechanism,and deformation twins formed by TWIP effect comprise primary,secondary and nanotwins.Furthermore,TRIP effect arises in the local high-strain region.Carbon element plays a key role in the transformation of the deformation mechanism.A small amount of carbide precipitates around twin boundaries lead to the formation of local carbon-poor regions,and Md temperature and stacking fault energy of medium-manganese high-carbon steel are propitious to the occurrence of TRIP effect.In addition,the contributions of various deformation mechanisms to plasticity are calculated,and that of TWIP effect is the greatest. | J.Chen Y.Zhang J.J.Wang C.M.Liu S.X.Zhao | 2020 | Journal of Iron and Steel Research(International)2020，27，9： | 1 |
| 8 | Tensile ductility and deformation mechanisms of a nanotwinned 316L austenitic stainless steel显示文摘A nanotwinned 316 L austenitic stainless steel was prepared by means of surface mechanical grinding treatment.After recovery annealing,the density of dislocations decreases obviously while the average twin/matrix lamella thickness still keeps in the nanometer scale.The annealed nanotwinned sample exhibits a high tensile yield strength of 771 MPa and a considerate uniform elongation of 8%.TEM observations showed that accommodating more dislocations and secondary twinning inside the nanotwins contribute to the enhanced ductility and work hardening rate of the annealed nanotwinned sample. | Y.Z.Zhang J.J.Wang N.R.Tao | 2020 | Journal of Materials Science & Technology2020，36，1： | 1 |
| 9 | Achieving superior mechanical properties of selective laser melted AlSi10Mg via direct aging treatment显示文摘For additive manufactured aluminum alloys,the inferior mechanical properties along the building direction have been a serious weakness.In this study,an optimized heat treatment was developed as a simple and effective solution.The effects of direct aging on microstructure and mechanical properties along the building direction of AlSi10Mg samples produced via selective laser melting(SLM)were investigated.The results showed that,compared with the conventional heat treatment at elevated temperatures,direct aging at temperatures of 130-190℃ could retain the fine grain microstructure of SLM samples and promote further precipitation of Si phase,however,the growth of pores occurred during direct aging.With increasing aging temperature,while finer cell structures were obtained,more and larger pores were developed,resulting in decreased density of the samples.Two types of pore formation mechanisms were identified.Considering the balance between the refinement of cell structure and the growth of pores,aging at 130℃ was determined as the optimized heat treatment for SLM AlSi10Mg samples.The tensile strength along the building direction of the 130℃ aged sample was increased from 403 MPa to 451 MPa,with relatively high elongation of 6.5%. | H.Zhang Y.Wang J.J.Wang D.R.Ni D.Wang B.L.Xiao Z.Y.Ma | 2022 | Journal of Materials Science & Technology2022，，13： | 1 |
| 10 | 查看详情显示文摘 | J.N.Coleman M.Lotya A.O'Neill S.D.Bergin P.J.King U.Khan K.Young A.Gaucher S.De R.J.Smith I.V.Shvets S.K.Arora G.Stanton H.Y.Kim K.Lee G.T.Kim G.S.Duesberg T.Hallam J.J.Boland J.J.Wang J.F.Donegan J.C.Grunlan G.Moriarty A.Shmeliov R.J.Nicholls J.M.Perkins | | 0，，： | 1 |
您所在的机构暂未开通此部分的功能，请联系管理员