The monocrystalline LiNbO_(3)(LN)and LiTaO_(3)(LT)plates have been qualified as a kind of material platform for high performance RF filter that is considerable for the 5G communication.LN and LT thin films are usually...The monocrystalline LiNbO_(3)(LN)and LiTaO_(3)(LT)plates have been qualified as a kind of material platform for high performance RF filter that is considerable for the 5G communication.LN and LT thin films are usually transferred on handle wafers by combining ion-slicing and wafer bonding technique to form a piezoelectric on insulator(POI)substrate.The ion implantation is a key process and the implantation-induced strain is essential for the layer transfer.Here,we reported the strain profile of ion implanted rotated Y-cut LN and LT.The ion implantation generates the out-of-plane tensile strain of the sample surface and(006)plane,while both the tensile and compressive strain are observed on the(030)plane.The implanted ions redistributed due to the anisotropy of LN and LT,and induce the main tensile normal to the(006)plane.Meanwhile,the(030)planes are contracted due to the Poisson effect with the interstitial ions disturbing and mainly show a compressive strain profile.展开更多
CO_(2)capture with a low energy consumption is of important application significance for reducing CO_(2)emission.The phase-change absorbent developed in recent years shows its potential for low-energy CO_(2)capture.Th...CO_(2)capture with a low energy consumption is of important application significance for reducing CO_(2)emission.The phase-change absorbent developed in recent years shows its potential for low-energy CO_(2)capture.The unclear phase-splitting rule hinders the efficient development of CO_(2)phase-change absorbents.To predict phase-splitting behaviors of mono/poly-amine-organic solvent-water system with various concentrations,a quasi-activity coefficient was developed based on Debye&Mc Aulay equation and some Density function theory descriptors.Six models based on Debye&Mc Aulay equation were developed with different ion radius,descriptors or poly-amine-CO_(2)products.The phase-splitting boundary was drawn on the model with the best predictability.This quasi-activity coefficient would provide guidance for the phase-splitting systems development,especially for polyamines.展开更多
[ Objective ] This study aimed to investigate the regulatory role of potassium levels in plant gene expression. [ Method ] By using wheat ( Triticum aesti- vum L. Beinong 9549) as experimental material, the protein ...[ Objective ] This study aimed to investigate the regulatory role of potassium levels in plant gene expression. [ Method ] By using wheat ( Triticum aesti- vum L. Beinong 9549) as experimental material, the protein expression in wheat roots under different levels of potassium was determined by two-dimensional elec- trophoresis (2-DE). [ Result] Compared with the plants supplied with normal level of potassium, 152 protein spots in wheat roots under potassium deficiency con- dition showed significant differences (P 〈 0.05 ), including 76 protein spots significantly up-regulated by more than twice and 76 protein spots significantly down- regulated by more than twice. After potassium deficiency treatment, the wheat plants were supplied with normal level of potassium for two weeks, which showed sig- nificant differences in 73 protein spots compared with the plants continuously supplied with normal level of potassium ( P 〈 0. 05 ), including 36 protein spots signif- icantly up-regulated by more than twice and 37 protein spots significantly down-regulated by more than twice. [ Conclusion] This study indicates that potassium de- ficiency stress would lead to induction of a large number of specific proteins in wheat roots.展开更多
Capacitive power transfer(CPT)technology is a newly emerging research focus for EV charging applications.Due to the absence of eddy current loss and light weight of the capacitive coupling metal plates,CPT technology ...Capacitive power transfer(CPT)technology is a newly emerging research focus for EV charging applications.Due to the absence of eddy current loss and light weight of the capacitive coupling metal plates,CPT technology is considered to be a promising alternative to the inductive power transfer(IPT)technology.In this paper,the recent designs of large-gap CPT systems designed for EV charging applications are summarized.And a graphical method based on Smith chart is proposed to analyze the characteristics of the compensation designs.With the design objectives graphically represented,the Smith chart can be used to visually analyze the performance of a compensation design,which could be helpful in multi-objectives design of the CPT system.The graphic features of three major design objectives on the Smith chart are investigated.Several guidelines of a good compensation design are concluded.展开更多
The relationship mechanism between the material pore structures and cathodic iodine chemistry plays a vital role in efficient Zn-I_(2) batteries,but is unclear,retarding further advances.This work innovatively indicat...The relationship mechanism between the material pore structures and cathodic iodine chemistry plays a vital role in efficient Zn-I_(2) batteries,but is unclear,retarding further advances.This work innovatively indicates a great contribution of∼2.5nm pore structure of nanocarbons to efficient iodine adsorption,rapid I^(−)↔I_(2) conversion,and polyiodide inhibition,via scrupulously designing catalysts with controllable pore sizes systematically.The I_(2)-loading within the designed nitrogen-doped nanocarbons can reach up to as high as 60.8 wt%.The batteries based on the cathode deliver impressive performances with a large capacity of 178.8 mAh/g and long-term cycling stability more than 4000 h at 5.0 C.Notably,these is no polyiodide such as I_(3)−and I_(5)−detected during the charge-discharge processes from comprehensive electrochemical cyclic voltammetry,X-ray photoelectron spectroscopy,and Raman technique.This work provides a novel knowledge-guided concept for rational pore design,promising better Zn-I_(2) batteries,which is also hoped to benefit other advanced energy technologies,such as Li-S,Li-ion,and Al-I_(2) batteries.展开更多
水系锌碘电池(AZIBs)是一种非常受欢迎的绿色储能技术,但它的能量密度极大地限制了其应用.在此,我们报道了一种高能量密度的可充电AZIBs,通过将高质量碘锚定到具有大微孔体积和富吡啶氮掺杂的独特分级多孔碳中来实现.多孔碳结合了微孔...水系锌碘电池(AZIBs)是一种非常受欢迎的绿色储能技术,但它的能量密度极大地限制了其应用.在此,我们报道了一种高能量密度的可充电AZIBs,通过将高质量碘锚定到具有大微孔体积和富吡啶氮掺杂的独特分级多孔碳中来实现.多孔碳结合了微孔对碘的强约束和氮掺杂对碘的强化学吸附的优点,可使碘的负载量高达61.6 wt%.密度泛函理论计算和实验研究表明,氮掺杂所赋予的丰富活性位点能促进AZIBs的氧化还原动力学,吡啶氮掺杂对AZIBs的吸附可逆转化比普通氮掺杂更有效.高负载碘电极在1.0 C时表现出219.3 mA h g^(-1)的高容量,优异的速率性能,以及优越的循环稳定性,在5.0 C时,循环10,000次内的容量衰减极低,每圈仅为0.00147%.由三节电池串联的初步装置,能量密度高,按电池总质量计算可达72.6 W h kg^(-1),几乎是商用铅酸和镍-镉电池能量密度的两倍.该水系电池的高能量密度和长循环寿命使其在大规模储能应用领域具有巨大潜力.展开更多
In this paper,InGaAs p-i-n photodetectors(PDs)on an InP/SiO2/Si(InPOI)substrate fabricated by ion-slicing technology are demonstrated and compared with the identical device on a commercial InP substrate.The quality of...In this paper,InGaAs p-i-n photodetectors(PDs)on an InP/SiO2/Si(InPOI)substrate fabricated by ion-slicing technology are demonstrated and compared with the identical device on a commercial InP substrate.The quality of epitaxial layers on the InPOI substrate is similar to that on the InP substrate.The photo responsivities of both devices measured at 1.55μm are comparable,which are about 0.808-0.828 A W^(-1).Although the dark current of PD on the InPOI substrate is twice as high as that of PD on the InP substrate at 300 K,the peak detectivities of both PDs are comparable.In general,the overall performance of the InPOI-based PD is comparable to the InP-based PD,demonstrating that the ion-slicing technology is a promising route to enable the highquality Si-based InP platform for the full photonic integration on a Si substrate.展开更多
基金supported by the National Key Research and Development Program of China(Grant No.2019YFB1803902)the National Natural Science Foundation of China(Grant Nos.11905282,61874128,61851406,11705262,and 6187407)+4 种基金the Frontier Science Key Program of CAS(Grant Nos.QYZDY-SSWJSC032 and ZDBS-LY-JSC009)Chinese-Austrian Cooperative Research and Development Project(Grant No.GJHZ201950)the Program of Shanghai Academic Research Leader(Grant No.19XD1404600)K.C.Wong Education Foundation(Grant No.GJTD-2019-11),Shanghai Sailing Program(Grant Nos.19YF1456200 and 19YF1456400)Shanghai Science and Technology Innovation Action Plan Program(Grant No.19XD1404600)。
文摘The monocrystalline LiNbO_(3)(LN)and LiTaO_(3)(LT)plates have been qualified as a kind of material platform for high performance RF filter that is considerable for the 5G communication.LN and LT thin films are usually transferred on handle wafers by combining ion-slicing and wafer bonding technique to form a piezoelectric on insulator(POI)substrate.The ion implantation is a key process and the implantation-induced strain is essential for the layer transfer.Here,we reported the strain profile of ion implanted rotated Y-cut LN and LT.The ion implantation generates the out-of-plane tensile strain of the sample surface and(006)plane,while both the tensile and compressive strain are observed on the(030)plane.The implanted ions redistributed due to the anisotropy of LN and LT,and induce the main tensile normal to the(006)plane.Meanwhile,the(030)planes are contracted due to the Poisson effect with the interstitial ions disturbing and mainly show a compressive strain profile.
基金financial support from National Natural Science Foundation of China(21878190)China Petrochemical Corporation(419033-1)the Engineering Experimental Teaching Center,School of Chemical Engineering,Sichuan University for the Nuclear Magnetic Resonance(NMR,JNM-ECZ400S/L1,JEOL Ltd.)support and the compute server support。
文摘CO_(2)capture with a low energy consumption is of important application significance for reducing CO_(2)emission.The phase-change absorbent developed in recent years shows its potential for low-energy CO_(2)capture.The unclear phase-splitting rule hinders the efficient development of CO_(2)phase-change absorbents.To predict phase-splitting behaviors of mono/poly-amine-organic solvent-water system with various concentrations,a quasi-activity coefficient was developed based on Debye&Mc Aulay equation and some Density function theory descriptors.Six models based on Debye&Mc Aulay equation were developed with different ion radius,descriptors or poly-amine-CO_(2)products.The phase-splitting boundary was drawn on the model with the best predictability.This quasi-activity coefficient would provide guidance for the phase-splitting systems development,especially for polyamines.
基金Supported by Basic Science Fund from Beijing University of Agriculture(2016016004)Beijing Science and Technology New Stars Program(2008B22)"Strengthen Education with Trained Personnel Plan" for Beijing Municipal Colleges and Universities
文摘[ Objective ] This study aimed to investigate the regulatory role of potassium levels in plant gene expression. [ Method ] By using wheat ( Triticum aesti- vum L. Beinong 9549) as experimental material, the protein expression in wheat roots under different levels of potassium was determined by two-dimensional elec- trophoresis (2-DE). [ Result] Compared with the plants supplied with normal level of potassium, 152 protein spots in wheat roots under potassium deficiency con- dition showed significant differences (P 〈 0.05 ), including 76 protein spots significantly up-regulated by more than twice and 76 protein spots significantly down- regulated by more than twice. After potassium deficiency treatment, the wheat plants were supplied with normal level of potassium for two weeks, which showed sig- nificant differences in 73 protein spots compared with the plants continuously supplied with normal level of potassium ( P 〈 0. 05 ), including 36 protein spots signif- icantly up-regulated by more than twice and 37 protein spots significantly down-regulated by more than twice. [ Conclusion] This study indicates that potassium de- ficiency stress would lead to induction of a large number of specific proteins in wheat roots.
基金This work was supported by National Natural Science Foundation of China(51507168)International Science&Technology Cooperation Program of China(2016YFE0102200)Beijing information science and technology university 2017'training plan"project.
文摘Capacitive power transfer(CPT)technology is a newly emerging research focus for EV charging applications.Due to the absence of eddy current loss and light weight of the capacitive coupling metal plates,CPT technology is considered to be a promising alternative to the inductive power transfer(IPT)technology.In this paper,the recent designs of large-gap CPT systems designed for EV charging applications are summarized.And a graphical method based on Smith chart is proposed to analyze the characteristics of the compensation designs.With the design objectives graphically represented,the Smith chart can be used to visually analyze the performance of a compensation design,which could be helpful in multi-objectives design of the CPT system.The graphic features of three major design objectives on the Smith chart are investigated.Several guidelines of a good compensation design are concluded.
基金supported by the Tianjin Natural Science Foundation of China(Nos.20JCZDJC00280 and 20JCYBJC00380).
文摘The relationship mechanism between the material pore structures and cathodic iodine chemistry plays a vital role in efficient Zn-I_(2) batteries,but is unclear,retarding further advances.This work innovatively indicates a great contribution of∼2.5nm pore structure of nanocarbons to efficient iodine adsorption,rapid I^(−)↔I_(2) conversion,and polyiodide inhibition,via scrupulously designing catalysts with controllable pore sizes systematically.The I_(2)-loading within the designed nitrogen-doped nanocarbons can reach up to as high as 60.8 wt%.The batteries based on the cathode deliver impressive performances with a large capacity of 178.8 mAh/g and long-term cycling stability more than 4000 h at 5.0 C.Notably,these is no polyiodide such as I_(3)−and I_(5)−detected during the charge-discharge processes from comprehensive electrochemical cyclic voltammetry,X-ray photoelectron spectroscopy,and Raman technique.This work provides a novel knowledge-guided concept for rational pore design,promising better Zn-I_(2) batteries,which is also hoped to benefit other advanced energy technologies,such as Li-S,Li-ion,and Al-I_(2) batteries.
基金supported by the Tianjin Natural Science Foundation of China(20JCZDJC00280 and 19JCQNJC05900)the National Key R&D Program of China(2017YFA0700104)the National Natural Science Foundation of China(21905205)。
文摘水系锌碘电池(AZIBs)是一种非常受欢迎的绿色储能技术,但它的能量密度极大地限制了其应用.在此,我们报道了一种高能量密度的可充电AZIBs,通过将高质量碘锚定到具有大微孔体积和富吡啶氮掺杂的独特分级多孔碳中来实现.多孔碳结合了微孔对碘的强约束和氮掺杂对碘的强化学吸附的优点,可使碘的负载量高达61.6 wt%.密度泛函理论计算和实验研究表明,氮掺杂所赋予的丰富活性位点能促进AZIBs的氧化还原动力学,吡啶氮掺杂对AZIBs的吸附可逆转化比普通氮掺杂更有效.高负载碘电极在1.0 C时表现出219.3 mA h g^(-1)的高容量,优异的速率性能,以及优越的循环稳定性,在5.0 C时,循环10,000次内的容量衰减极低,每圈仅为0.00147%.由三节电池串联的初步装置,能量密度高,按电池总质量计算可达72.6 W h kg^(-1),几乎是商用铅酸和镍-镉电池能量密度的两倍.该水系电池的高能量密度和长循环寿命使其在大规模储能应用领域具有巨大潜力.
基金supported by the National Key Research and Development Program of China(Grant No.2017YFE0131300)the National Natural Science Foundation of China(Grant Nos.U1732268,61874128,11622545,61851406,11705262,61875220,and 61804157)+7 种基金the Frontier Science Key Program of Chinese Academy of Sciences(Grant Nos.QYZDY-SSWJSC032,and ZDBS-LY-JSC009)the Chinese-Austrian Cooperative Research and Development Project(Grant No.GJHZ201950)the Shanghai Science and Technology Innovation Action Plan Program(Grant No.17511106202)the Program of Shanghai Academic Research Leader(Grant No.19XD1404600)the Shanghai Youth Top Talent ProgramShanghai Sailing Program(Grant Nos.19YF1456200,and 19YF1456400)the K.C.Wong Education Foundation(Grant No.GJTD-2019-11)the NCBiR within the Polish-China(Grant No.WPC/130/NIR-Si/2018)。
文摘In this paper,InGaAs p-i-n photodetectors(PDs)on an InP/SiO2/Si(InPOI)substrate fabricated by ion-slicing technology are demonstrated and compared with the identical device on a commercial InP substrate.The quality of epitaxial layers on the InPOI substrate is similar to that on the InP substrate.The photo responsivities of both devices measured at 1.55μm are comparable,which are about 0.808-0.828 A W^(-1).Although the dark current of PD on the InPOI substrate is twice as high as that of PD on the InP substrate at 300 K,the peak detectivities of both PDs are comparable.In general,the overall performance of the InPOI-based PD is comparable to the InP-based PD,demonstrating that the ion-slicing technology is a promising route to enable the highquality Si-based InP platform for the full photonic integration on a Si substrate.