Two new three-dimensional coordination polymers, Na [M(nta)]·H 2O(M=Co, Ni) were hydrothermally synthesized and their structures were solved by single-crystal X-ray diffraction. Their structures were analogous an...Two new three-dimensional coordination polymers, Na [M(nta)]·H 2O(M=Co, Ni) were hydrothermally synthesized and their structures were solved by single-crystal X-ray diffraction. Their structures were analogous and the two crystals belong to the orthorhombic system with space group P2 1, and cell parameters a=0.785 7(9) nm, b=0.974 3(12) nm, c= 1.219 0(18) nm, V=0.933 4(2) nm 3, Z=4 for Na [Co(nta)]·H 2O and a=0.796 7(16) nm, b= 0.975 2(2) nm, c=1.218 2(2) nm, V=0\^946 5(3) nm 3, Z=4 for Na [Ni(nta)]·H 2O. The structures of the title compounds are considered to be four M(nta) - octahedra connected by the sodium atoms, thus the three-dimensional tunnels were formed. Variable temperature magnetic susceptibility indicates that the antiferromagnetic interaction exists in Na[Co(nta)]·H 2O and Na [Ni(nta)]·H 2O.展开更多
In this work,we put forward a scheme to exquisitely design and selectively synthesize the core@shell structured MSe_(2)/FeSe_(2)@MoSe_(2)(M=Co,Ni)flower-like multicomponent nanocomposites(MCNCs)through a simple two-st...In this work,we put forward a scheme to exquisitely design and selectively synthesize the core@shell structured MSe_(2)/FeSe_(2)@MoSe_(2)(M=Co,Ni)flower-like multicomponent nanocomposites(MCNCs)through a simple two-step hydrothermal reaction on the surfaces of MFe_(2)O_4 nanospheres with the certain amounts of Mo and Se sources.With increasing the amounts of Mo and Se sources,the obtained core@shell structured MSe_(2)/FeSe_(2)@MoSe_(2)(M=Co,Ni)MCNCs with the enhanced content of MoSe_(2)and improved flower-like geometry morphology could be produced on a large scale.The obtained results revealed that the as-prepared samples displayed improved comprehensive microwave absorption properties(CMAPs)with the increased amounts of Mo and Se sources.The as-prepared CoSe_(2)/FeSe_(2)@MoSe_(2)and NiSe_(2)/FeSe_(2)@MoSe_(2)MCNCs with the well-defined flower-like morphology could simultaneously present the outstanding CMAPs in terms of strong absorption capability,wide absorption bandwidth,and thin matching thicknesses,which mainly originated from the conduction loss and flower-like geometry morphology.Therefore,the findings not only develop the very desirable candidates for high-performance microwave absorption materials but also pave a new way for optimizing the CMAPs through tailoring morphology engineering.展开更多
GMR effect of multilayers of bcc-Fe(M)(M=Co, Ni) alloy and Cu layers has been investigated. The maximum MR ratio is found at 1.1 nm Fe(Co) and 1.3～1.4 nm Cu layer thickness in [Fe(Co)/CuJ, and at 1.6 nm Fe(Ni) and 1....GMR effect of multilayers of bcc-Fe(M)(M=Co, Ni) alloy and Cu layers has been investigated. The maximum MR ratio is found at 1.1 nm Fe(Co) and 1.3～1.4 nm Cu layer thickness in [Fe(Co)/CuJ, and at 1.6 nm Fe(Ni) and 1.4 nm Cu layer thickness in [Fe(Ni)/Cu]. Under the optimum annealing condition, the MR ratio increases up to 50% and 38% for Fe(Co) and Fe(Ni) systems, respectively. The origin of the increase of GMR is discussed, taking the progress of preferred orientation of Fe(Co)[100] or Fe(Ni)[100] by anneahng into account.展开更多
Transition metal catalysts M-N-C（M = Co,Fe,Mn） were synthesized by a template-free method by heating meso-tetraphenyl porphyrins（i.e.CoTPP,FeTPPCl,MnTPPCl） precursors.The catalysts were characterized by N2 adsorpt...Transition metal catalysts M-N-C（M = Co,Fe,Mn） were synthesized by a template-free method by heating meso-tetraphenyl porphyrins（i.e.CoTPP,FeTPPCl,MnTPPCl） precursors.The catalysts were characterized by N2 adsorption-desorption,thermogravimetry,high-resolution transmission electron microscopy,and Raman and X-ray photoelectron spectroscopy.The selective oxidation of ethylbenzene with molecular oxygen under a solvent-free condition was carried out to explore the catalytic performance of the M-N-Cs,which exhibited different catalytic performance.That was ascribed to the difference in M（Co,Fe,Mn） and different graphitization degree forming during the heating process,in which M（Co,Fe,Mn） might have different catalytic activity on the formation of the M-N-C catalyst.All the M-N-C composites had remarkable recyclability in the selective oxidation of ethylbenzene.展开更多
高校新工科教育背景下对研究生创新创业教育提出更高要求,创新创业课程教学是提升研究生双创能力有效途径之一。而现有创新创业课程还存在内容设置与产业创新创业链不匹配,只关注创业链中的单个或部分环节,未全面覆盖;创新创业课程内容...高校新工科教育背景下对研究生创新创业教育提出更高要求,创新创业课程教学是提升研究生双创能力有效途径之一。而现有创新创业课程还存在内容设置与产业创新创业链不匹配,只关注创业链中的单个或部分环节,未全面覆盖;创新创业课程内容设置与行业特色匹配度不高,专业和行业特色缺乏等问题。本文以移动物联网(Mobile Internet of Things,MIoT)产业为例,探索和创新M2M(Market to Market)端到端全链创新创业课程内容建设模式,实现移动物联网产业调研与选择、产业链与市场分析、产业关键技术、产品研发与管理和产品营销与运营5部分课程内容设计,构建M2M端到端创新创业商业逻辑全链闭环。教学实践表明,创新创业课程内容设计能有效提升研究生、工程实践和学科竞赛培养质量,具有一定的推广和示范意义。展开更多
文摘Two new three-dimensional coordination polymers, Na [M(nta)]·H 2O(M=Co, Ni) were hydrothermally synthesized and their structures were solved by single-crystal X-ray diffraction. Their structures were analogous and the two crystals belong to the orthorhombic system with space group P2 1, and cell parameters a=0.785 7(9) nm, b=0.974 3(12) nm, c= 1.219 0(18) nm, V=0.933 4(2) nm 3, Z=4 for Na [Co(nta)]·H 2O and a=0.796 7(16) nm, b= 0.975 2(2) nm, c=1.218 2(2) nm, V=0\^946 5(3) nm 3, Z=4 for Na [Ni(nta)]·H 2O. The structures of the title compounds are considered to be four M(nta) - octahedra connected by the sodium atoms, thus the three-dimensional tunnels were formed. Variable temperature magnetic susceptibility indicates that the antiferromagnetic interaction exists in Na[Co(nta)]·H 2O and Na [Ni(nta)]·H 2O.
基金financially supported by the Fund of Fok Ying Tung Education Foundationthe Major Research Project of innovative Group of Guizhou province(2018–013)+2 种基金the Open Fund from Henan University of Science and Technologythe National Science Foundation of China(Nos.11964006 and 11774156)the Foundation of the National Key Project for Basic Research(No.2012CB932304)。
文摘In this work,we put forward a scheme to exquisitely design and selectively synthesize the core@shell structured MSe_(2)/FeSe_(2)@MoSe_(2)(M=Co,Ni)flower-like multicomponent nanocomposites(MCNCs)through a simple two-step hydrothermal reaction on the surfaces of MFe_(2)O_4 nanospheres with the certain amounts of Mo and Se sources.With increasing the amounts of Mo and Se sources,the obtained core@shell structured MSe_(2)/FeSe_(2)@MoSe_(2)(M=Co,Ni)MCNCs with the enhanced content of MoSe_(2)and improved flower-like geometry morphology could be produced on a large scale.The obtained results revealed that the as-prepared samples displayed improved comprehensive microwave absorption properties(CMAPs)with the increased amounts of Mo and Se sources.The as-prepared CoSe_(2)/FeSe_(2)@MoSe_(2)and NiSe_(2)/FeSe_(2)@MoSe_(2)MCNCs with the well-defined flower-like morphology could simultaneously present the outstanding CMAPs in terms of strong absorption capability,wide absorption bandwidth,and thin matching thicknesses,which mainly originated from the conduction loss and flower-like geometry morphology.Therefore,the findings not only develop the very desirable candidates for high-performance microwave absorption materials but also pave a new way for optimizing the CMAPs through tailoring morphology engineering.
基金Ministry of Education, Science, Sports and Culture under Grantin-Aid for Scielltific Research on Priority Areas (A), Japan!(No.
文摘GMR effect of multilayers of bcc-Fe(M)(M=Co, Ni) alloy and Cu layers has been investigated. The maximum MR ratio is found at 1.1 nm Fe(Co) and 1.3～1.4 nm Cu layer thickness in [Fe(Co)/CuJ, and at 1.6 nm Fe(Ni) and 1.4 nm Cu layer thickness in [Fe(Ni)/Cu]. Under the optimum annealing condition, the MR ratio increases up to 50% and 38% for Fe(Co) and Fe(Ni) systems, respectively. The origin of the increase of GMR is discussed, taking the progress of preferred orientation of Fe(Co)[100] or Fe(Ni)[100] by anneahng into account.
基金supported by the National Natural Science Foundation of China (21103045, 1210040, 1103312)State Key Laboratory of Heavy Oil at China University of Petroleum (SKCHOP201504)Key Laboratory of Mineralogy and Metallogeny of the Chinese Academy of Sciences at Guangzhou Institute of Geochemistry(KLMM20150103)~~
文摘Transition metal catalysts M-N-C（M = Co,Fe,Mn） were synthesized by a template-free method by heating meso-tetraphenyl porphyrins（i.e.CoTPP,FeTPPCl,MnTPPCl） precursors.The catalysts were characterized by N2 adsorption-desorption,thermogravimetry,high-resolution transmission electron microscopy,and Raman and X-ray photoelectron spectroscopy.The selective oxidation of ethylbenzene with molecular oxygen under a solvent-free condition was carried out to explore the catalytic performance of the M-N-Cs,which exhibited different catalytic performance.That was ascribed to the difference in M（Co,Fe,Mn） and different graphitization degree forming during the heating process,in which M（Co,Fe,Mn） might have different catalytic activity on the formation of the M-N-C catalyst.All the M-N-C composites had remarkable recyclability in the selective oxidation of ethylbenzene.
文摘高校新工科教育背景下对研究生创新创业教育提出更高要求,创新创业课程教学是提升研究生双创能力有效途径之一。而现有创新创业课程还存在内容设置与产业创新创业链不匹配,只关注创业链中的单个或部分环节,未全面覆盖;创新创业课程内容设置与行业特色匹配度不高,专业和行业特色缺乏等问题。本文以移动物联网(Mobile Internet of Things,MIoT)产业为例,探索和创新M2M(Market to Market)端到端全链创新创业课程内容建设模式,实现移动物联网产业调研与选择、产业链与市场分析、产业关键技术、产品研发与管理和产品营销与运营5部分课程内容设计,构建M2M端到端创新创业商业逻辑全链闭环。教学实践表明,创新创业课程内容设计能有效提升研究生、工程实践和学科竞赛培养质量,具有一定的推广和示范意义。
