It is difficult to study the contribution to total cutting noise of each sound radiator in cutting system by means of traditional theoretical or experimental methods. In this paper, problems associated with cylindrica...It is difficult to study the contribution to total cutting noise of each sound radiator in cutting system by means of traditional theoretical or experimental methods. In this paper, problems associated with cylindrical thin shell 's cutting noise are studied by applying Statistical Energy Analysis of Non-Conservatively Coupled Systems under Correlative Power Input. Theory and techniques for parameter evaluation, cutting system modelling and other important problems concerned are also discussed. Results show that cutting noise is mainly from the sound radiation of workpiece in cutting process, and Statistical Energy Analysis can be applied successfully to the research of large cylindrical shell 's cutting noise.展开更多
The survival probability of an excited compound nucleus was studied using two different approaches of the washing out of shell effects with excitation energy based on a superasymmetric reaction system.The estimated ev...The survival probability of an excited compound nucleus was studied using two different approaches of the washing out of shell effects with excitation energy based on a superasymmetric reaction system.The estimated evaporation residue cross sections based on the two different methods are compared with the available experimental data.Both methods are in agreement with the experimental data to a certain extent for some specific reactions and emission channels.展开更多
A simple polyol and sol–gel Stober process were employed for synthesis of YF_3：Tb~＋（core）, YF_3：Tb~＋@LaF_3（core/shell） and YF_3：Tb~＋@LaF_3@SiO_2（core/shell/SiO_2） nanoparticles（NPs）. The phase purity, c...A simple polyol and sol–gel Stober process were employed for synthesis of YF_3：Tb~＋（core）, YF_3：Tb~＋@LaF_3（core/shell） and YF_3：Tb~＋@LaF_3@SiO_2（core/shell/SiO_2） nanoparticles（NPs）. The phase purity, crystalinity,morphology, optical and photoluminescence properties were investigated and discussed with the help of various analytical techniques including X-ray diffraction pattern,FE-transmission electron microscopy（TEM）,FTIR, UV/vis absorption, energy band gap and emission spectra. XRD andFE-TEM studies indicate the formation of core/shell nanostructure and ~10 nm thick amorphous silica surface coating surrounding the core-NPs, which is also confirmed byFTIR spectral results. The surface modifications of core-NPs significantly affect the optical features in the form of energy band gap, which were correlated with particle size of the nanomaterials. The comparative emission spectral results show that after inert layer coating the luminescent core-NPs display stronger emission intensity in respect to core and silica coated core/shell/SiO_2-NPs. The solubility character along with colloidal stability was improved after silica surface modification, whereas luminescent intensity was suppressed causing the surface functionalized with high energy silanol（Si-OH） molecules. These novel luminescent nanomaterials with enhanced emission intensity and excellent solubility in aqueous solvents would be potentially useful for fluorescence bioimaging/optical bio-probe etc.展开更多
文摘It is difficult to study the contribution to total cutting noise of each sound radiator in cutting system by means of traditional theoretical or experimental methods. In this paper, problems associated with cylindrical thin shell 's cutting noise are studied by applying Statistical Energy Analysis of Non-Conservatively Coupled Systems under Correlative Power Input. Theory and techniques for parameter evaluation, cutting system modelling and other important problems concerned are also discussed. Results show that cutting noise is mainly from the sound radiation of workpiece in cutting process, and Statistical Energy Analysis can be applied successfully to the research of large cylindrical shell 's cutting noise.
基金Supported by the National Natural Science Foundation of China(11705055)Hunan Provincial Natural Science Foundation of China(2018JJ3324)excellent youth fund of Hunan Provincial Education Department(17B154)。
文摘The survival probability of an excited compound nucleus was studied using two different approaches of the washing out of shell effects with excitation energy based on a superasymmetric reaction system.The estimated evaporation residue cross sections based on the two different methods are compared with the available experimental data.Both methods are in agreement with the experimental data to a certain extent for some specific reactions and emission channels.
基金funded byNational Plan for Science,Technology and Innovation(MAARIFAH)King Abdulaziz City for Science and Technology,Kingdom of Saudi Arabia,award number(No.13-Bio1246-02)
文摘A simple polyol and sol–gel Stober process were employed for synthesis of YF_3：Tb~＋（core）, YF_3：Tb~＋@LaF_3（core/shell） and YF_3：Tb~＋@LaF_3@SiO_2（core/shell/SiO_2） nanoparticles（NPs）. The phase purity, crystalinity,morphology, optical and photoluminescence properties were investigated and discussed with the help of various analytical techniques including X-ray diffraction pattern,FE-transmission electron microscopy（TEM）,FTIR, UV/vis absorption, energy band gap and emission spectra. XRD andFE-TEM studies indicate the formation of core/shell nanostructure and ~10 nm thick amorphous silica surface coating surrounding the core-NPs, which is also confirmed byFTIR spectral results. The surface modifications of core-NPs significantly affect the optical features in the form of energy band gap, which were correlated with particle size of the nanomaterials. The comparative emission spectral results show that after inert layer coating the luminescent core-NPs display stronger emission intensity in respect to core and silica coated core/shell/SiO_2-NPs. The solubility character along with colloidal stability was improved after silica surface modification, whereas luminescent intensity was suppressed causing the surface functionalized with high energy silanol（Si-OH） molecules. These novel luminescent nanomaterials with enhanced emission intensity and excellent solubility in aqueous solvents would be potentially useful for fluorescence bioimaging/optical bio-probe etc.
