In this paper, we present the complex permittivity measurement of low-loss substrates based on a microstrip-line-excited split-ring resonator (SRR). Permittivity of an unknown substrate is calculated based on the chan...In this paper, we present the complex permittivity measurement of low-loss substrates based on a microstrip-line-excited split-ring resonator (SRR). Permittivity of an unknown substrate is calculated based on the change in oscillation frequency of SRR caused by the material-under-test (MUT) above the SRR. Theoretical analysis and results of the simulations and experiments demonstrate the microstrip-line-excited SRR can be used to effectively improve measurement sensitivity. Simple equations for measurement of low-loss substrates using SRR are proposed and experimentally verified.展开更多
In order to determine the best sowing date of the main cultivar Yumi 2 of Shaanxi Province in western Heilongjiang Province,taking Yumi 2 as experimental materials,five sowing periods were set: May 8( B1),May 18( B2),...In order to determine the best sowing date of the main cultivar Yumi 2 of Shaanxi Province in western Heilongjiang Province,taking Yumi 2 as experimental materials,five sowing periods were set: May 8( B1),May 18( B2),May 28( B3),June 7( B4),and June 17( B5),and field experiment was carried out in Heping Pasture of Suihua Administration Bureau in Heilongjiang Province. The plant height,main panicle length,main stem node number,grain number per panicle,1000-grain weight,and yield of Yumi 2 were compared under different treatments. The results showed that the treatments of B1,B2 and B3 were higher than those of B4 and B5 in the plant height,main panicle length,main stem node number,grain number per panicle and 1000-grain weight. The yield of B1 was the highest in five treatments,and the yield was higher than that of B2,B3,B4 and B5 for 7. 41%,8. 33%,28. 70%,and 19. 44% respectively. Based on the above traits,it is concluded that the appropriate sowing date of Yumi 2 is May 8 in the arid area of western Heilongjiang Province so as to get higher yield.展开更多
Interfacial nanostructured materials have stimulated extensive interests in the research areas of green energy production and conversion due to their unique structures and performance.These interfacial crystalline str...Interfacial nanostructured materials have stimulated extensive interests in the research areas of green energy production and conversion due to their unique structures and performance.These interfacial crystalline structures with rich intrinsic defects,such as oxygen vacancies,adatoms,grain bounda-ries,and substitutional impurities,have led to unique activities in a variety of catalytic reactions.The rational design and engineering development of the interfaces provide an attractive way to optimize the catalytic performance and finally improve the efficiency of energy conversion and storage.Herein,a comprehensive overview of interfacial inorganic nanostructures and their electrocatalytic applications are summarized,and some future challenge and opportunity have also been proposed.展开更多
文摘In this paper, we present the complex permittivity measurement of low-loss substrates based on a microstrip-line-excited split-ring resonator (SRR). Permittivity of an unknown substrate is calculated based on the change in oscillation frequency of SRR caused by the material-under-test (MUT) above the SRR. Theoretical analysis and results of the simulations and experiments demonstrate the microstrip-line-excited SRR can be used to effectively improve measurement sensitivity. Simple equations for measurement of low-loss substrates using SRR are proposed and experimentally verified.
基金Supported by the National Key Technologies R&D Program of China during th12th Five-Year Plan Period(2014BAD07B03)Postdoctoral Science Founda tion Project of Heilongjiang Province(LBH-Z14177)+1 种基金Scientific Research Starting Project for College Introducing Talents(XYB2014-08)National Uni versity Student Innovation Program(XC2016004)
文摘In order to determine the best sowing date of the main cultivar Yumi 2 of Shaanxi Province in western Heilongjiang Province,taking Yumi 2 as experimental materials,five sowing periods were set: May 8( B1),May 18( B2),May 28( B3),June 7( B4),and June 17( B5),and field experiment was carried out in Heping Pasture of Suihua Administration Bureau in Heilongjiang Province. The plant height,main panicle length,main stem node number,grain number per panicle,1000-grain weight,and yield of Yumi 2 were compared under different treatments. The results showed that the treatments of B1,B2 and B3 were higher than those of B4 and B5 in the plant height,main panicle length,main stem node number,grain number per panicle and 1000-grain weight. The yield of B1 was the highest in five treatments,and the yield was higher than that of B2,B3,B4 and B5 for 7. 41%,8. 33%,28. 70%,and 19. 44% respectively. Based on the above traits,it is concluded that the appropriate sowing date of Yumi 2 is May 8 in the arid area of western Heilongjiang Province so as to get higher yield.
基金the National Natural Science Foundation of China(NSFC)(Nos.21931001,21922105,21571089)the Fundamental Research Funds for the Central Uni-versities(lzujbky-2018-k08,lzujbky-2019-it10,lzujbky-2018-it40 and Izujbky-2017-it42)+1 种基金Special Fund Project of Guiding Scientific and Technological Innovation Development of Gansu Province(2019ZX-04)As alumni of Lanzhou University,all authors wish to dedicate this work to Lanzhou University on the occasion of its 110th anniversary.
文摘Interfacial nanostructured materials have stimulated extensive interests in the research areas of green energy production and conversion due to their unique structures and performance.These interfacial crystalline structures with rich intrinsic defects,such as oxygen vacancies,adatoms,grain bounda-ries,and substitutional impurities,have led to unique activities in a variety of catalytic reactions.The rational design and engineering development of the interfaces provide an attractive way to optimize the catalytic performance and finally improve the efficiency of energy conversion and storage.Herein,a comprehensive overview of interfacial inorganic nanostructures and their electrocatalytic applications are summarized,and some future challenge and opportunity have also been proposed.
