|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Machine learning guided appraisal and exploration of phase design for high entropy alloys显示文摘High entropy alloys(HEAs)and compositionally complex alloys(CCAs)have recently attracted great research interest because of their remarkable mechanical and physical properties.Although many useful HEAs or CCAs were reported,the rules of phase design,if there are any,which could guide alloy screening are still an open issue.In this work,we made a critical appraisal of the existing design rules commonly used by the academic community with different machine learning(ML)algorithms.Based on the artificial neural network algorithm,we were able to derive and extract a sensitivity matrix from the ML modeling,which enabled the quantitative assessment of how to tune a design parameter for the formation of a certain phase,such as solid solution,intermetallic,or amorphous phase.Furthermore,we explored the use of an extended set of new design parameters,which had not been considered before,for phase design in HEAs or CCAs with the ML modeling.To verify our ML-guided design rule,we performed various experiments and designed a series of alloys out of the Fe-Cr-Ni-Zr-Cu system.The outcomes of our experiments agree reasonably well with our predictions,which suggests that the ML-based techniques could be a useful tool in the future design of HEAs or CCAs. | Ziqing Zhou Yeju Zhou Quanfeng He Zhaoyi Ding Fucheng Li Yong Yang | 2019 | npj Computational Materials2019，，1： | 16 |
| 2 | Stratigraphy and age of the Daohugou Bed in Ningcheng,Inner Mongolia显示文摘Recent fieldwork has extended the distribution of the Daohugou Bed deposits from the Daohugou Village to its several neighboring areas. The fossil-bearing Daohugou deposits uncomformably overlie complex bedrocks, and com- prise three major parts. The red shales in the lower part were misidentified as belonging to the Tuchengzi Formation. Field excavation has indicated that the shales of upper part of the bed are the major fossil-bearing horizon. Due to strong tectonic activities, sediments were often folded with the se- quences inverted in the region. Some newly recognized con- tacts between the Daohugou Bed and the volcanic rocks showed that the ignimbrite of the Tiaojishan Formation (159―164 Ma) underlies the Daohugou deposits, rather than overlying the latter as previously proposed. Thus, the age of the Daohugou deposits should be younger than the age of the ignimbrite, and thus it was incorrect to correlate the Dao- hugou Bed with the Middle Jurassic Jiulongshan Formation. Although biostratigraphic studies based on conchostracans and insects support a Middle Jurassic-early Late Jurassic age for the Daohugou deposits, vertebrate fossils such as Liaoxitriton, Jeholopterus and feathered maniraptorans show much resemblance to those of the Yixian Formation. In other words, despite the absence of Lycoptera, a typical fish of the Jehol Biota, the Daohugou vertebrate assemblage is closer to that of the Early Cretaceous Jehol Biota than to any other biota. We propose that the Daohugou fossil assemblage probably represents the earliest evolutionary stage of the Jehol Biota based on both vertebrate biostratigraphy and the sedimentological and volcanic features which suggest the Daohugou deposit belongs to the same cycle of volcanism and sedimentation as the Yixian Formation of the Jehol Group. | WANG Xiaolin ZHOU Zhonghe HE Huaiyu JIN Fan WANG Yuanqing ZHANG Jiangyong WANG Yuan XU Xing ZHANG Fucheng | 2005 | Chinese Science Bulletin2005，50，20： | 6 |
| 3 | Global nitrogen input on wetland ecosystem:The driving mechanism of soil labile carbon and nitrogen on greenhouse gas emissions显示文摘Greenhouse gas emissions from wetlands are significantly promoted by global nitrogen input for changing the rate of soil carbon and nitrogen cycling,and are substantially affected by soil labile carbon and nitrogen conversely.However,the driving mechanism by which soil labile carbon and nitrogen affect greenhouse gas emissions from wetland ecosystems under global nitrogen input is not well understood.Working out the driving factor of nitrogen input on greenhouse gas emissions from wetlands is critical to reducing global warming from nitrogen input.Thus,we synthesized 72 published studies(2144 paired observations)of greenhouse gas fluxes and soil labile compounds of carbon and nitrogen(ammonium,nitrate,dissolved organic carbon,soil microbial biomass nitrogen and carbon),to understand the effects of labile carbon and nitrogen on greenhouse gas emissions under global nitrogen input.Across the data set,nitrogen input significantly promoted carbon dioxide,methane and nitrous oxide emissions from wetlands.In particular,at lower nitrogen rates(<100 kg ha^(-1)$·yr^(-1))and with added ammonium compounds,freshwater wetland significantly promoted carbon dioxide and methane emissions.Peatland was the largest nitrous oxide source under these conditions.This meta-analysis also revealed that nitrogen input stimulated dissolved organic carbon,ammonium,nitrate,microbial biomass carbon and microbial biomass nitrogen accumulation in the wetland ecosystem.The variation-partitioning analysis and structural equation model were used to analyze the relationship between the greenhouse gas and labile carbon and nitrogen further.These results revealed that dissolved organic carbon(DOC)is the primary factor driving greenhouse gas emission from wetlands under global nitrogen input,whereas microbial biomass carbon(MBC)more directly affects greenhouse gas emission than other labile carbon and nitrogen. | Mengli Chen Lian Chang Junmao Zhang Fucheng Guo Jan Vymazal Qiang He Yi Chen | 2020 | Environmental Science and Ecotechnology2020，，4： | 2 |
| 4 | Translocation and biotoxicity of metal (oxide) nanoparticles in the wetland-plant system显示文摘Engineered nanoparticles(ENPs)threaten the environment through wastewater discharging.Generally,constructed wetlands(CWs)are efficient methods for ENPs removal.However,the biotoxicity of ENPs on plants in CWs is unclear.Here,we investigated the distribution and bio-impacts of different ENPs(Ag NPs,TiO_(2) NPs,and CeO_(2) NPs)in plants under 5-and 60-day exposure to 1 and 50 mg/L concentrations.Results showed that ENPs appeared in the vascular bundle and mesophyll cell space,which induced the variation in antioxidase activities(e.g.,superoxide dismutase[SOD],peroxidase[POD],and catalase[CAT]activities)as well as overproduction of malondialdehyde(MDA).Additionally,Ag NPs inhibited photosynthesis rate and root activity during two exposure phases.CeO_(2) NPs had positive and negative impacts on plants in 5-and 60-day exposure,respectively.Inversely,TiO_(2) NPs enhanced photosynthesis and root activity under 60-day exposure.Finally,the contents of the C,N,and P elements in plants fluctuated in response to ENPs stress.All results have a positive correlation with the wetland performance under ENPs exposure except for TiO_(2) NPs treatment.Overall,our study systematically reveals aquatic plants'responses to ENPs and provides a reference for building ecological treatment systems to purify wastewater containing ENPs. | Xiangyu Yang Qiang He Fucheng Guo Xiaobo Liu Yi Chen | 2021 | Frontiers of Environmental Science & Engineering2021，15，6： | 1 |
| 5 | Thermodynamics for nonequilibrium solvation and numerical evaluation of solvent reorganization energy显示文摘This work presents a thermodynamic method for treating nonequilibrium solvation. By imposing an extra electric field onto the nonequilibrium solvation system, a virtual constrained equilibrium state is prepared. In this way, the free energy difference between the real nonequilibrium state and the con-strained equilibrium one is simply the potential energy of the nonequilibrium polarization in the extra electronic field, according to thermodynamics. Further, new expressions of nonequilibrium solvation energy and solvent reorganization energy have been formulated. Analysis shows that the present formulations will give a value of reorganization energy about one half of the traditional Marcus theory in polar solvents, thus the explanation on why the traditional theory tends to overestimate this quantity has been found out. For the purpose of numerical determination of solvent reorganization energy, we have modified Gamess program on the basis of dielectric polarizable continuum model. Applying the procedure to the well-investigated intramolecular electron transfer in biphenyl-androstane-naphthyl and biphenyl-androstane-phenanthryl systems, the numerical results of solvent reorganization energy have been found to be in good agreement with the experimental fittings. | LI XiangYuan WANG JingBo MA JianYi FU KeXiang HE FuCheng | 2008 | Science China Chemistry2008，51，12： | 1 |
| 6 | Relative severity investigation in a severe load spectrum 显示文摘 | Xiaofan He Fucheng Sui Yanmin Dong | 2010 | Engineering Failure Analysis2010，17，78： | 1 |
| 7 | Electron transfer NO 2 + +NO→N02+NO+ in aromatic nitration显示文摘 | Xiangyuan Li Fucheng He | 1997 | Science in China Series B: Chemistry1997，，5： | 1 |
| 8 | Ab initio study of long-range electron transfer between biphenyl anion radical and naphthalene显示文摘 | Xiangyuan Li Shunqing Xiao Fucheng He | 1999 | Science in China Series B: Chemistry1999，，4： | 1 |
| 9 | Electron transfer NO 2 + +NO→N02+NO+ in aromatic nitration显示文摘 | Xiangyuan Li Fucheng He | 1997 | Science in China Series B: Chemistry1997，，5： | 1 |
| 10 | Electron transfer NOz+ + NO-NO2 _NO+ in aromatic nitration显示文摘 | Li Xiangyuan He Fucheng | 1997 | Science in China(Series B)1997，40，52： | 1 |
| 11 | Ab initio study of long-range electron transfer between biphenyl anion radical and naphthalene显示文摘 | Xiangyuan Li Shunqing Xiao Fucheng He | 1999 | Science in China Series B: Chemistry1999，，4： | 1 |
| 12 | A new multi-turn beam dump scheme design and simulation for HIAF-BRing machine protection显示文摘Purpose To protect accelerator devices from being damaged by high-power beam,a new beam dump system is under design for HIAF-BRing.Method Based on the optical characteristics,unwanted particles are safely deflected to a specific internal absorber through a local bump orbit generated by active-discharging magnets,which is achieved by paralleling a bleeder resistor of 600 m�to two of dipole magnet power supplies.Results Taking alignment and multipolefield errors into account,discarded beam can be dumped within 5 ms with an efficiency of more than 99.8%at any operation stage.Conclusion The proposed beam dump solution satisfies the machine protection requirements for BRing and can provide a new idea for similar facilities. | Ren Hang Yang Jiancheng Shen Guodong Wang Geng Yao Liping Ruan Shuang Sheng Lina Wu Junxia Zhao He Liu Jie Cai Fucheng Gao Yunzhe Chang Mingxuan Li Minxiang | 2022 | Radiation Detection Technology and Methods2022，6，4： | 1 |
| 13 | Probabilistic characterization and experimental study for variation of load spectrum in a fleet显示文摘 | He Xiaofan Sui Fucheng Zhai Bin Liu Wenting | 2013 | Engineering Failure Analysis2013，33，41： | 1 |
| 14 | Effect of GNPs on microstructures and mechanical properties of GNPs/Al-Cu composites with different heat treatment status显示文摘Microstructural and mechanical behavior of heat treatable Al-4.6Cu binary alloy reinforced with graphene nanoplates(GNPs) in different heat treatment status were investigated in this paper.The addition of GNPs significantly enhanced the yield strength and tensile strength of Al-Cu alloy regardless of the heattreatment conditions.It was also found that GNPs accelerated the formation of precipitates,leading to a greatly shortened aging time for GNPs/Al-4.6Cu composite to reach the peak hardness.However,aging treatment enhanced the strength of GNPs/Al-Cu composite very little,which could be explained by the interaction between GNPs,precipitates and dislocations.This work inspires us that the heat treatment process of aluminum alloy matrix composites should be designed independently with the matrix in quest of an optimum performance. | Tielong Han Fucheng Wang Jiajun Li Chunnian He Naiqin Zhao | 2021 | Journal of Materials Science & Technology2021，，33： | 1 |
| 15 | Expression of Vascular Endothelial Growth Factor C and Its Clinical Significance in Human Esophageal Squamous Cell Carcinoma显示文摘OBJECTIVE To examine the expression of vascular endothelial growth factor C(VEGF-C)in human esophageal squamous cell carcinoma(ESCC), and to clarify its role in lymphatic metastasis in ESCC patients. METHODS Esophageal carcinoma EC9706 cel s and samples from 49 patients with primary ESCC were investigated by using S-P immunohisto- chemistry(IHC),the semi-quantitative reverse transcriptase-polymerase chain reaction(RT-PCR)and in situ hybridization(ISH)methods for VEGF-C expression. RESULTS VEGF-C positive expression was found in EC9706 cells through IHC,ISH and RT-PCR.Positive IHC for VEGF-C was observed in 36 of 49 cases of ESCC.There was a significant difference between the expres- sion of VEGF-C in a lymph-node-positive group compared to a node-nega- tive group(χ2=4.7,P<0.05).Positive ISH for VEGF-C mRNA was observed in 23 of 49 cases of ESCC.There was a significant difference between the expression of VEGF-C in the lymph-node-positive group and node-negative group(χ2=31.3,P<0.01).The expression of VEGF-C was significantly higher in the lymph-node-positive group compared to the node-negative group.Of 49 ESCC tissues,RT-PCR for VEGF-C mRNA was observed positively in 29 cases.There was a significant difference between the expression of VEGF-C in the lymph-node-positive group and node-negative group(χ2=23.3, P<0.01).The expression of VEGF-C was significantly higher in the lymph- node-positive group compared to the node-negative group.Expressions of VEGF-C were not significantly associated with age,gender,and pathological grade.There was a relationship between VEGF-C mRNA expressions by RT-PCR and ISH(χ2=18.5,P<0.01)in ESCC cases,but with no significant difference between the two methods. CONCLUSION VEGF-C expression may induce lymphangiogenesis in human ESCC.There was a close correlation between VEGF-C expression and lymph node metastasis.VEGF-C can serve as a useful prognostic factor for ESCC patients. | Hongxin Zhang Lan Zhang Kuisheng Chen Dongling Gao Fucheng He Yunhan Zhang | 2007 | Chinese Journal of Clinical Oncology2007，4，2： | 0 |
| 16 | Two types of coumarins-specific enzymes complete the last missing steps in pyran- and furanocoumarins biosynthesis显示文摘Pyran-and furanocoumarins are key representatives of tetrahydropyrans and tetrahydrofurans,respectively,exhibiting diverse physiological and medical bioactivities.However,the biosynthetic mechanisms for their core structures remain poorly understood.Here we combined multiomics analyses of biosynthetic enzymes in Peucedanum praeruptorum and in vitro functional verification and identified two types of key enzymes critical for pyran and furan ring biosynthesis in plants.These included three distinct P.praeruptorum prenyltransferases(PpPT1e3)responsible for the prenylation of the simple coumarin skeleton 7 into linear or angular precursors,and two novel CYP450 cyclases(PpDC and PpOC)crucial for the cyclization of the linear/angular precursors into either tetrahydropyran or tetrahydrofuran scaffolds.Biochemical analyses of cyclases indicated that acid/base-assisted epoxide ring opening contributed to the enzyme-catalyzed tetrahydropyran and tetrahydrofuran ring refactoring.The possible acid/base-assisted catalytic mechanisms of the identified cyclases were theoretically investigated and assessed using site-specific mutagenesis.We identified two possible acidic amino acids Glu303 in PpDC and Asp301 in PpOC as vital in the catalytic process.This study provides new enzymatic tools in the epoxide formation/epoxide-opening mediated cascade reaction and exemplifies how plants become chemically diverse in terms of enzyme function and catalytic process. | Yucheng Zhao Yuedong He Liangliang Han Libo Zhang Yuanzheng Xia Fucheng Yin Xiaobing Wang Deqing Zhao Sheng Xu Fei Qiao Yibei Xiao Lingyi Kong | 2024 | Acta Pharmaceutica Sinica B2024，14，2： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员