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| 1 | Effect of Cryogenic Treatment on Deformation Behavior of As-cast AZ91 Mg Alloy显示文摘The as-cast AZ91 Mg alloy samples were cryogenic treated with different time. Otherwise, optical microscope (OM), mechanical test, resistance test and XRD analysis were used to research the microstructure evolution and physical variation of the samples before and after cryogenic treatment (CT). Due to CT, the structure of as-cast AZ91 Mg alloy was changed from disordered solid solution to ordered solid solution. Firstly, the appearance of ordered solid solution leads to the improvement of peak stress after CT, because of ordered strengthening. Secondly, resistance and crystallographic lattice constant of the samples reduce obviously. Otherwise, the frame-type twinning which is created from matrix in the cryogenic environment could hinder the twin growth and cause the ordered strengthening. | LIU Junwei LI Guifa CHEN Ding CHEN Zhenhua | 2012 | Chinese Journal of Aeronautics2012，25，6： | 3 |
| 2 | Assessment of wheat chlorophyll content by the multiple linear regression of leaf image features显示文摘The measurement of crop nutrition is considerably significant in agricultural practices,especially in the application of mechanized variable rate fertilization.Feature extraction and model building are two important links in crop nutrition measurement by digital image.In this paper,a feature set of fusion multi-colour space in field prototype is extracted and an evaluation approach using stepwise-based ridge regression(SBRR)that uses correlation-based evaluation method is employed.First the image features of three known colour spaces are extracted,meanwhile a new colour space named rgb is constructed according to the characteristics that RGB colour space easily affected by light.Then the SBRR with nested cross validation is used to find the best evaluation model.By performance evaluation,the optimal SBRR model is obtained(R^(2)=0.718 RMSE=5.111).Additionally,compared with two other nutritional evaluation approach named backpropagation artificial neural network(BP-ANN)and k-nearest neighbors(KNN),SBRR achieves better performance in both R^(2) and RMSE.Furthermore the proposed model’s reliability is verified using the image dataset taken from the same wheat field in the next year.The R^(2) and RMSE values are 0.794 and 4.304,respectively.The comparisons and verification show that our proposed SBRR approach can achieve better experimental results and can be considered a reliable and low-cost alternative for estimating the chlorophyll content of wheat leaves in field. | Yufei Song Guifa Teng Yingchun Yuan Tianzhen Liu Zhimei Sun | 2021 | Information Processing in Agriculture2021，8，2： | 2 |
| 3 | Mechanical properties,thermophysical properties and electronic structure of Yb^(3+)or Ce^(4+)-doped La_(2)Zr_(2)O_(7)-based TBCs显示文摘First-principles calculations based on density functional theory were perfo rmed to investigate the cohesive energies,elastic modulus,Debye temperatures,thermal conductivities and density of states of La_(2-x)Yb_(x)Zr_(2)O_(7),La_(2)Zr_(2-x)Ce_(x)O_(7)and La_(2-x)Yb_(x)Zr_(2-x)Ce_(x)O_(7)(x=0.00,0.25,0.50,0.75,1.00)ceramics.The results show that doping Yb~(3+)or Ce~(4+)into La_(2)Zr_(2)O_(7)reduces its elastic modulus,thermal conductivity and Debye temperature.Compared with La_(2-x)Yb_(x)Zr_(2)O_(7)(x≠0.00),La_(2)Zr_(2-x)Ce_(x)O_(7)compounds have better ductility and lower Debye te mperature.The Debye temperature values of La_(2)Zr_(2-x)Ce_(x)O_(7)(x≠0.00)co mpounds are in the range of 485.0-511.5 K.Among all components,the fluorite-type La_(2-x)Yb_(x)Zr_(2-x)Ce_(x)O_(7)(x=0.75,1.00)compounds exhibit better mechanical and thermophysical properties,and their thermal conductivity values are only 1.213-1.246 W/(m·K)(1073 K),which are 14.5%-16.7%lower than that of the pure La_(2)Zr_(2)O_(7).Thus,our findings open an entirely new avenue for TBCs. | Pengsen Zhao Haizhong Zheng Guifa Li Yongxiang Geng Yixin Xiao Hongbo Guo Ping Peng | 2023 | Journal of Rare Earths2023，41，4： | 2 |
| 4 | Influence of Bisphenol A on Developing Rat Estrogen Receptors and Some Cytokines in Rats: A Two-Generational Study显示文摘 | Song Miao Zhixian Gao Zengqiang Kou Guifa Xu Cunju Su Nan Liu | 2008 | Journal of Toxicology and Environmental Health Part A2008，，15： | 1 |
| 5 | Electrophysiological comparison of the effects of MCI-154 on smooth muscles between mesenteric artery and vein of dogs显示文摘 | Hikaru H Guifa C Hideharu O | 1993 | General Pharmacology:The Vascular System1993，24，： | 1 |
| 6 | Convection-enhanced delivery of nanodiamond drug delivery platforms for intracranial tumor treatment显示文摘 | Guifa Xi Erik Robinson Barbara Mania-Farnell Elio Fausto Vanin Kyu-Won Shim Tsurubuchi Takao Elise Victoria Allender Chandra Shekhar Mayanil Marcelo Bento Soares Dean Ho Tadanori Tomita | 2014 | Nanomedicine: Nanotechnology, Biology, and Medicine2014，，： | 1 |
| 7 | Sulfur-doped graphene as an efficient metal-free cathode catalyst for oxygen reduction显示文摘 | Zhi Y Zhen Y Guifa L | 2011 | Acs Nano2011，，1： | 1 |
| 8 | Identification of ju- jube trees diseases using neural network 显示文摘 | ZhangWeidan Teng Guifa Wang Chunshan | 2013 | Optik2013，，11： | 1 |
| 9 | The Improvement of a Feature-based Image Mosaics Algo- rithm显示文摘 | Xiaoru Zhang Ke Xiao Guandong Gao Guifa Teng | 2008 | International Journal of Innovative Computing In- formation and Control2008，4，10： | 1 |
| 10 | Electrophysiological comparison of the effects of MCI-154 on smooth muscles between mesenteric artery and vein of dogs显示文摘 | Hikaru H Guifa C Hideharu O | 1993 | General Pharmacology:the Vascular System1993，24，2： | 1 |
| 11 | Structure stability and configuration evolution of Al_n(n=3, 4, 6, 13, 19) clusters显示文摘Using a first-principles pseudo-potential plane wave method, the geometrical and electronic structures of Aln (n=3, 4, 6, 13, 19) clusters with different configurations have been calculated. Several parameters such as the binding energy Eb and the HOMO-LUMO energy gap ?EH-L have been adopted to characterize and analyze the structure stability of these clusters, and their configuration evolutions are also investigated by linear synchronous transit (LST) method. It is demonstrated that the stable configura- tions of Al3, Al4, Al6, Al13, Al19 clusters are triangle, rhombus, octahedron, icosahedron and double icosahedron, respectively. For Al6 and Al19 clusters there are metastable structures of parallelogram and octahedron, respectively, whereas in the Al3, Al4 and Al13 clusters, no metastable configuration is validated. There exist a large energy gap and a low energy barrier between the octahedron and the parallelogram of the Al6 cluster, so the transfor- mation from its metastable to stable structures is rather easy. By contrast, a small energy gap and a high energy barrier between the stable and metastable structures of Al19 cluster mean its configuration evolution from the octahedron to the double icosahedron occurs hardly, therefore the metastable octahedron configuration of Al19 cluster can be extensively detected in experiments and simulations. | PENG Ping LI Guifa ZHENG Caixing HAN Shaochang LIU Rangsu | 2006 | Science China(Technological Sciences)2006，49，4： | 1 |
| 12 | Effects of resistant starch on colonic preneoplastic aberrant crypt foci in rats 显示文摘 | Liu Ruiping Xu Guifa | 2008 | Food and Chemical Toxicology2008，46，： | 1 |
| 13 | Stereoselective synthesis of highly funetionalized eyclopropanes, application to the asymmetric synthesis of (1S,2S) -2,3-methanoamino acids显示文摘 | PHILIPPE D GUIFA S GITrE L | 1999 | J Org Chem1999，64，13： | 1 |
| 14 | Sulfur-Doped Grapheneas an Effi cient Metal-Free Cathode Catalyst for Oxygen Reduction显示文摘 | Yang Zhi Yao Zhen Li Guifa | 2011 | ACS Nano2011，6，1： | 1 |
| 15 | Sulfur-doped graphene as an efficient metal-free cathode catalyst for oxygen reduc- tion显示文摘 | YANG Zhi YAO Zhen LI Guifa etal | 2011 | ACS Nano2011，6，1： | 1 |
| 16 | Sulfur-doped graphene as ar efficient metal - free cathode catalyst for oxygen reduction 显示文摘 | Yang Zhi Yao Zhen Li Guifa | 2011 | ACS Nano2011，，6： | 1 |
| 17 | Electrophysiological comparison of the effects of MCI-154 on smooth muscles between mesenteric artery and vein of dogs显示文摘 | Hikaru H Guifa C Hideharu O | 1993 | General Pharmacology:The Vascular System1993，24，2： | 1 |
| 18 | Passive-Event-Assisted Approach for the Localizability of Large-Scale Randomly Deployed Wireless Sensor Network显示文摘Localizability in large-scale, randomly deployed Wireless Sensor Networks(WSNs) is a classic but challenging issue. To become localizable, WSNs normally require extensive adjustments or additional mobile nodes. To address this issue, we utilize occasional passive events to ease the burden of localization-oriented network adjustment. We prove the sufficient condition for node and network localizability and design corresponding algorithms to minimize the number of nodes for adjustment. The upper bound of the number of adjusted nodes is limited to the number of articulation nodes in a connected graph. The results of extensive simulations show that our approach greatly reduces the cost required for network adjustment and can thus provide better support for the localization of large-scale sparse networks than other approaches. | Zhiguo Chen Guifa Teng Xiaolei Zhou Tao Chen | 2019 | Tsinghua Science and Technology2019，24，2： | 0 |
| 19 | One dimensional nickel phosphide polymorphic heterostructure as carbon-free functional support loading single-atom iridium for promoted electrocatalytic water oxidation显示文摘Although conducting materials such as carbon nanotube and carbon fiber paper(CFP)have been extensively employed as support of electrocatalytic active sites,most of them are of poor catalytic functionality by themselves and undesirable stability during strong acid/alkaline environments or oxidation process.Here we report a novel one-dimensional(1D)nickel phosphide polymorphic heterostructure(denoted as NPPH)to work as one effective carbon-free functional support for loading of single-atom Ir water oxidation electrocatalyst.Specifically,the NPPH composed of both Ni12P5and Ni2P phases is not only active for robust alkaline water oxidation but also is of good stability and hydrophilicity for favorable loading of single-atom dispersed iridium.The NPPH supported single-atom Ir electrocatalyst(Ir/NPPH)is found to exhibit remarkably superior water oxidation activity with respect to the NPPH itself or CFP supported single-atom Ir catalyst(Ir/CFP),demonstrating the synergetic promotion effect between NPPH and single-atom Ir catalyst.Furthermore,the NPPH supported single-atom Ir catalyst can bear alkaline water oxidation for over 120 h at current density of 50 mA cm^(-2).The NPPH developed here is expected as functional support to composite with other water oxidation catalysts,as may be an alternative strategy of developing highly efficient carbon-free electrocatalysts. | Rashid Mehmood Guifa Long Wenjun Fan Mingrun Li Lifang Liu Fuxiang Zhang | 2023 | Journal of Energy Chemistry2023，，4： | 0 |
| 20 | Histone modification as a drug resistance driver in brain tumors显示文摘Patients with brain tumors,specifically,malignant forms such as glioblastoma,medulloblastoma and ependymoma,exhibit dismal survival rates despite advances in treatment strategies.Chemotherapeutics,the primary adjuvant treatment for human brain tumors following surgery,commonly lack efficacy due to either intrinsic or acquired drug resistance.New treatments targeting epigenetic factors are being explored.Post-translational histone modification provides a critical regulatory platform for processes such as chromosome condensation and segregation,apoptosis,gene transcription,and DNA replication and repair.This work reviews how aberrant histone modifications and alterations in histone-modifying enzymes can drive the acquisition of drug resistance in brain tumors.Elucidating these mechanisms should lead to new treatments for overcoming drug resistance. | Guifa Xi Barbara Mania-Farnell Ting Lei Tadanori Tomita | 2016 | Oncology and Translational Medicine2016，2，5： | 0 |
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