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| 1 | Climate and litter C/N ratio constrain soil organic carbon accumulation显示文摘Soil organic carbon(SOC) plays critical roles in stabilizing atmospheric CO2 concentration, but the mechanistic controls on the amount and distribution of SOC on global scales are not well understood. In turn, this has hampered the ability to model global C budgets and to find measures to mitigate climate change. Here, based on the data from a large field survey campaign with 2600 plots across China’s forest ecosystems and a global collection of published data from forested land, we find that a low litter carbon-to-nitrogen ratio(C/N) and high wetness index(P/PET, precipitation-to-potentialevapotranspiration ratio) are the two factors that promote SOC accumulation, with only minor contributions of litter quantity and soil texture. The field survey data demonstrated that high plant diversity decreased litter C/N and thus indirectly promoted SOC accumulation by increasing the litter quality. We conclude that any changes in plant-community composition, plant-species richness and environmental factors that can reduce the litter C/N ratio, or climatic changes that increase wetness index, may promote SOC accumulation. The study provides a guideline for modeling the carbon cycle of various ecosystem scales and formulates the principle for land-based actions for mitigating the rising atmospheric CO2 concentration. | Guoyi Zhou Shan Xu Philippe Ciais Stefano Manzoni Jingyun Fang Guirui Yu Xuli Tang Ping Zhou Wantong Wang Junhua Yan Gengxu Wang Keping Ma Shenggong Li Sheng Du Shijie Han Youxin Ma Deqiang Zhang Juxiu Liu Shizhong Liu Guowei Chu Qianmei Zhang Yuelin Li Wenjuan Huang Hai Ren Xiankai Lu Xiuzhi Chen | 2019 | National Science Review2019，6，4： | 21 |
| 2 | Temperature Characteristics of Surface Acoustic Waves Propagating on La_3Ga_5SiO_4 Substrates显示文摘Langasite (LGS) is a novel piezoelectric crystal. The authors numerically analyses the temperature stability of surface acoustic waves (SAW) and the relation of SAW propagation with temperature on certain optimal cuts on LGS in this paper. The results show that LGS has better temperature stability than traditional piezo crystals. The results alsodemonstrate that the velocity of SAW decrease with temperature, the electro-mechanical coupling constant (k2) and temperature coefficient of frequency increases parabolically and the power flow angle increases linearly on certain optimal cuts of LGS. The calculation result compared with the experimental and show good agreement. | Guowei ZHANG, Wenkang SHI, Xiaojun JI, Tao HAN, Feng DU and Lianger LISchool of Electronics & Information, Shanghai Jiao Tong University, Shanghai 200030, China | 2004 | Journal of Materials Science & Technology2004，20，1： | 2 |
| 3 | Diuretic activity and kidney medulla AQP1, AQP2, AQP3, V2R expression of the aqueous extract of sclerotia of Polyporus umbellatus显示文摘 | Guowei Zhang Xing Zeng Ling Han | 2010 | FRIES in normal Ethno- pharmacology2010，128，2： | 1 |
| 4 | Effect of Soil C,N and P Stoichiometry on Soil Organic C Fractions After Afforestation显示文摘Afforestation is recognized as an important driving force for soil organic C(SOC) dynamics and soil element cycling.To evaluate the relationships between soil C:N:P stoichiometry and SOC fractions,soil C:N:P stoichiometry distributions at 0–200 cm soil depths were analyzed and the contents of SOC fractions were evaluated in 9 typical land-use systems on the Loess Plateau of China.The contents of light fraction organic C,particulate organic C(>53,53–2 000,and>2 000 μm),labile organic C,microbial biomass C,and dissolved organic C decreased with increasing soil depth and were higher in afforested soil than in slope cropland soil.Compared with the slope cropland,different vegetation types influenced soil C:N,C:P,and N:P ratios,especially when C:P and N:P ratios were significantly higher(P<0.05).Moreover,SOC fractions at the 0–10 and 10–40 cm depths were particularly affected by soil C:P ratio,whereas those at the 40–100 and 100–200 cm soil depths were significantly affected(P<0.05) by soil N:P ratio.These results indicate that changes in SOC fractions are largely driven by soil C:P and N:P ratios at different soil depths after afforestation. | ZHAO Fazhu ZHANG Lu SUN Jiao REN Chengjie HAN Xinhui YANG Gaihe PANG Guowei BAI Hongying WANG Jun | 2017 | Pedosphere2017，27，4： | 1 |
| 5 | Improved plasmon-assisted photoelectric conversion efficiency across entire ultraviolet-visible region based on antenna-on zinc oxide/silver three-dimensional nanostructured films显示文摘ZnO 在 photoelectrochemical 水切开,光催化,和光电的设备为应用收到了巨大的注意。然而, ZnO 的光电的变换效率被 photoexcited 电子洞对和宽乐队差距的快速的再结合限制,它允许仅仅要吸收的太阳的光谱的小部分。最近,实质的研究努力试图增加光电的变换效率越过全部紫外可见(紫外力) 由与高贵金属 nanoparticles (NP ) 联合象 ZnO 那样的半导体的光谱。在这研究,我们作为在用途广泛的紫外力的照明下面,光电流在 ZnO/Ag 产生了的 photoelectrodes.We 表演比较一部纯 ZnO 电影和 ZnO/Ag nanostructured 电影的表演三维(3D ) nanostructured 相对在纯 ZnO 电影产生的光电流拍摄增加 3.75 次。我们把高光电流归因于与 Ag NP 的局部性的表面电浆子回声联系的电场的改进,并且到 photoexcited 的创造,它在在 3D nanostructured 电影的高密度是在场的在被转移到 ZnO 的 Ag 的热电子,支持电子洞对分离。我们建议机制在新窗户中解释光电的变换 efficiency.Open | Lijuan Yan Yang Liu Yaning Yan Lanfang Wang Juan Han Yanan Wang Guowei Zhou Mark T. Swihart Xiaohong Xu | 2018 | Nano Research2018，11，1： | 1 |
| 6 | Exact Multiplicity of One-Sign Solutions for a Class of Quasilinear Eigenvalue Problems显示文摘This paper concerns the exact multiplicity of one-sign solutions of a class of quasilinear elliptic eigenvalue problems with asymptotical nonlinearity at 0 and ∞.The proofs of our main results are based upon bifurcation techniques and stability analysis. | Guowei DAI Xiaoling HAN | 2014 | Journal of Mathematical Research with Applications2014，34，1： | 0 |
| 7 | Theoretical Studies on the SAW Properties of LGS at High-Temperature in Optimal Cuts显示文摘Surface acoustic wave (SAW) devices play a significant role in signal processing, frequency control and sensing applications. In general, they cannot operate at elevated temperature. The new crystal of langasite provides possibility for surface acoustic wave devices applied at high temperature. This paper studies the SAW properties of single and doubly rotated cuts of LGS at high temperature. The calculated SAW properties of LGS are analyzed in space with aid of contour plots, and two promising SAW orientation regions at high temperature are presented. For some typical cuts and propagating directions within the two optimal regions, their SAW characteristics vs temperature are discussed. Based on the experimental evidence in some literatures, the reliability of calculated results is verified. | Xiaojun JI, Tao HAN, Wenkang SHI and Guowei ZHANGDepartment of Instrumentation Engineering, Shanghai Jiao Tong University, Shanghai 200030, China | 2004 | Journal of Materials Science & Technology2004，20，5： | 0 |
| 8 | A new DRIE cut-off material in SOG MEMS process显示文摘The silicon on glasses process is a common preparation method of micro-electro-mechanical system inertial devices,which can realize the processing of thick silicon structures.This paper proposes that indium tin oxides(ITO)film can serve as a deep silicon etching cut-off layer because ITO is less damaged under the attack of fluoride ions.ITO has good electrical conductivity and can absorb fluoride ions for silicon etching and reduce the reflection of fluoride ions,thus reducing the foot effect.The removal and release of ITO use an acidic solution,which does not damage the silicon structure.Therefore,the selection of the sacrificial layer has an excellent effect in maintaining the shape of the MEMS structure.This method is used in the preparation of MEMS accelerometers with a structure thickness of 100μm and a feature size of 4μm.The over-etching of the bottom of the silicon structure caused by the foot effect is negligible.The difference between the simulated value and the designed value of the device characteristic frequency is less than 5%.This indicates that ITO is an excellent deep silicon etch stopper material. | Chaowei Si Yingchun Fu Guowei Han Yongmei Zhao Jin Ning Zhenyu Wei Fuhua Yang | 2023 | Journal of Semiconductors2023，44，4： | 0 |
| 9 | Carbon nanotube-dependent synthesis of armchair graphene nanoribbons显示文摘Sub-nanometer armchair graphene nanoribbons(GNRs)with moderate band gap have great potential towards novel nanodevices.GNRs can be synthesized in the confined tubular space of single-walled carbon nanotubes(SWCNTs),in which precursor molecules have been specifically designed to form the GNRs with certain width and edge.However,it is still unexplored how the diameter and metallicity of SWCNTs influence the synthesis of the GNRs.Herein,we applied a series of SWCNTs with different average diameters to study the diameter-dependent synthesis of GNRs.By using Raman spectroscopy and transmission electron microscopy,we found that the width of the GNRs can be tailored by the diameter of the SWCNTs.Especially,the SWCNTs with average diameter of 1.3 nm produced 6 and 7 armchair GNRs with the highest yield,which can be well explained by considering the width of the GNRs and van der Waals radius of hydrogen and carbon atoms.In addition,semiconducting and metallic SWCNTs produced GNRs with different yields,which could attribute to different diameter distributions and density of defects.These results enable the possibility of a high-yield production of certain armchair graphene nanoribbons in large scale,which would benefit future applications as semiconductor with sub-nanometer in width. | Yifan Zhang Kecheng Cao Takeshi Saito Hiromichi Kataura Hans Kuzmany Thomas Pichler Ute Kaiser Guowei Yang Lei Shi | 2022 | Nano Research2022，15，3： | 0 |
| 10 | The effect of parasitic charge on the output stability of MEMS gyroscopes显示文摘Output voltage drifting was observed in MEMS gyroscopes. Other than the quadrature error, frequency mismatch and quality factor, the dielectric parasitic charge was thought to be a major determinant. We studied the mechanism and variation of the parasitic charge in the MEMS gyroscopes, and analyzed the effect of the parasitic charge on the output stability. This phenomenon was extremely obvious in the Pyrex encapsulated MEMS gyroscopes. Due to the DC voltage required for the electrostatic actuation, the parasitic charge in the dielectric layer would accumulate and induce a residual voltage. This voltage had an impact on the resonant frequency of the gyroscopes, so as to affect the output stability. The theoretical studies were also confirmed by our experimental results. It was shown that the parasitic charge was harmful to the output stability of MEMS gyroscopes. | Nan Liu Yan Su Xin Tong Guowei Han Chaowei Si Zhaofeng Li Jin Ning | 2018 | Journal of Semiconductors2018，39，8： | 0 |
| 11 | Straw return increases crop production by improving soil organic carbon sequestration and soil aggregation in a long-term wheat-cotton cropping system显示文摘Straw return is a promising strategy for managing soil organic carbon(SOC)and improving yield stability.However,the optimal straw return strategy for sustainable crop production in the wheat(Triticum aestivum L.)-cotton(Gossypium hirsutum L.)cropping system remains uncertain.The objective of this study was to quantify the long-term(10 years)impact of carbon(C)input on SOC sequestration,soil aggregation and crop yields in a wheat-cotton cropping system in the Yangtze River Valley,China.Five treatments were arranged with a single-factor randomized design as follows:no straw return(Control),return of wheat straw only(Wt),return of cotton straw only(Ct),return of 50%wheat and 50%cotton straw(Wh-Ch)and return of 100%wheat and 100%cotton straw(Wt-Ct).In comparison to the Control,the SOC content increased by 8.4 to 20.2%under straw return.A significant linear positive correlation between SOC sequestration and C input(1.42-7.19 Mg ha^(−1)yr^(−1))(P<0.05)was detected.The percentages of aggregates of sizes>2 and 1-2 mm at the 0-20 cm soil depth were also significantly elevated under straw return,with the greatest increase of the aggregate stability in the Wt-Ct treatment(28.1%).The average wheat yields increased by 12.4-36.0%and cotton yields increased by 29.4-73.7%,and significantly linear positive correlations were also detected between C input and the yields of wheat and cotton.The average sustainable yield index(SYI)reached a maximum value of 0.69 when the C input was 7.08 Mg ha^(−1)yr^(−1),which was close to the maximum value(SYI of 0.69,C input of 7.19 Mg ha^(−1)yr^(-1))in the Wt-Ct treatment.Overall,the return of both wheat and cotton straw was the best strategy for improving SOC sequestration,soil aggregation,yields and their sustainability in the wheat-cotton rotation system. | Changqin Yang Xiaojing Wang Jianan Li Guowei Zhang Hongmei Shu Wei Hu Huanyong Han Ruixian Liu Zichun Guo | 2024 | Journal of Integrative Agriculture2024，23，2： | 0 |
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