等离子体技术的固氮应用

空气中的氮气由于其牢固的N≡N三键,不易被植物直接吸收.等离子体固氮为高效实现将氮分子(N2)转化为可吸收的含氮化合物(NOx,NH3等)提供了新途径.相比传统Haber-Bosch(H-B)工艺,等离子体技术可以使用间歇性可再生能源,成本低廉,并且理论能耗仅为H-B工艺的0.5倍,因而在固氮领域受到广泛关注.本篇综述...     

染料敏化太阳能电池TiO2电极的制备及电解质的影响

采用溶胶-凝胶水热法制备了锐钛矿型纳米晶TiO₂薄膜电极,在乙二醇碳酸酯(EC)/1,2-丙二醇碳酸酯(PC)电解液体系中,研究了I₂和KI含量对电极光电性能的影响,发现随着电解液中I₂含量的增加,电池的短路光电流呈现先增加后减小的趋势,但光电流增加和减少的幅度并不大,同时体系的暗电流不断增加,光电压不断下降;随着电解液中KI含量的增加,电池的短路光电流也不断增加,当KI的含量大于0.2 mol/L时,电池的短路光电流的增加的趋势减缓.并对电解液中I₂和KI含量对电池光电性能影响的原因进行了初步的探讨.     

抗聚集诱导荧光猝灭的固态发光碳纳米点:制备、光物理性质及应用

碳点由于其低毒性、易制备、良好的光稳定性及可调的发光等特性有望成为一类理想的新型固态发光材料.然而,由于聚集诱导荧光猝灭(ACQ)效应的存在,使得碳点在固态发光领域的发展受到了限制,因此制备具有抗ACQ效应的固态发光碳点是碳点研究领域的一个重要方向.本文根据固态发光碳点研究的最新进展,从碳核、表面态调控、超分子及聚合物...     

基于有机溶剂原位制备的致密疏水铜金属层在保护锌负极中的应用

通过在 N-甲基吡咯烷酮(NMP)有机溶剂中锌电极与 CuI之间的置换反应,在锌电极上原位构建了一层致密且疏水的铜金属保护层(Cu@Zn)。铜金属保护层能有效地隔离锌电极与电解液的接触,减少锌电极-电解液界面的析氢和腐蚀等副反应。同时,铜金属保护层还具有较好的亲锌性,更小的界面电阻,更低的成核能垒,有利于锌离子均匀沉积,从而有效抑制了锌枝晶的生成。Cu@Zn对称电池实现了超过 1 700 h(1 mA·cm^-2)和 1 330 h(3 mA·cm^-2)的循环寿命。采用商用 MnO₂与之匹配得到的Cu@Zn||MnO₂全电池不仅在1 A·g^-1下具有168.5 mAh·g^-1的可逆比容量,还可稳定循环2 000次以上     

三种不同组合的统一计数公式

三种不同组合的统一计数公式环伟成林昆明（江苏省如皋中学２２６５００）ｎ个不同元素的集记为从小到大写的自然数集Ｎ＝｛１，２，３，…，ｎ｝．从此集中选出ｒ个元素的集记为｛ｊ１，ｊ２，ｊ３，…，ｊｒ｝，其中自然数仍依从小到大排列．取定非负整数ｋｉ，１ｉ?..     

Fabrication and Magnetic Properties of Co-Doped TiO2 Powders Studied by Nuclear Magnetic Resonance

Co0.04 Ti0.96O2 powders are fabricated by sol-gel method. The structure and magnetic properties are investigated under different annealing conditions systematically with emphasis on the influence of oxygen pressure. Pure anatase structure was acquired for all the samples annealed at 450℃ for one hour. The samples annealed in air exhibit evident room-temperature ferromagnetism (RTFM) with a small magnetic moment of 0.029μB per Co atom and coercivity Hc of 26 Oe, while the samples annealed in vacuum have strong RTFM with a larger magnetic moment of 1.18μB per Co atom and Hc of 430 Oe. The zero-field spin echo nuclear magnetic resonance spectrum of ^59Co is obtained to prove the existence of Co dusters in the latter samples, implying that the Co dusters are responsible for the strong RTFM in the samples annealed in vacuum. No Co cluster could be observed using both XPS and NMR techniques in the samples annealed in air, implying that the RTFM found in these sample sis intrinsic.     

Numerical Study on a Lateral Double-Gate Tunnelling Field Effect Transistor

A novel lateral double-gate tunnelling field effect transistor （DG-TFET） is studied and its performance is presented by a two-dimensional device simulation with code ISE. The result demonstrates that this new tunnelling transistor allows for the steeper sub-threshold swing below 60mV/dec, the super low supply voltage （operable at VDD 〈 0.3 V） and the rail-to-rail logic （significant on-state current at the drain-source voltage VDS = 50mV） for the aggressive technology assumptions of the availability of high-k/metal stack with equivalent gate oxide thickness EOT =0.24 nm and the work function difference 4.5 eV of materials.     

α-Si1-xCx:H薄膜材料的弹性反冲探测分析

介绍在中国原子能科学研究院HI-13串列加速器上，对α-Si1-xCx:H薄膜样品进行弹性反冲探测分析的方法和结果．用该加速器提供的高品质^127Ⅰ束流轰击α-Si1-xCx:H薄膜材料样品，用△E(gas)一E(PSD)望远镜探测器，在前角区(30。角)测量从该样品中反冲的各元素的能谱．然后用离子束分析(IBA)程序SIMNRA对能谱进行拟合，得到样品中H，C和Si的比分及深度分布．Elastic recoil detection analysis of α-Si_(1-x)C_(x)∶H foils has been performed at the HI-13 tandem accelerator of CIAE. High quality~(127)I beam bombards the target of α -Si_(1-x)C_(x)∶H_( ) thin film. A ΔE(gas)-(E(PSD)) telescope was used to measure the energy spectra of all elements recoiled from the samples at the angle of 30° in laboratory system. Components of H, C and Si and the profiles were obtained by simulation of the energy spectra using the program SIMNRA calculation.     

茉莉酮及二氢茉莉酮的新合成

以3-硅基环戊-2-烯酮为原料,用连串的烷基共轭加成-亲核烷基化方法,可方便地制得茉莉酮及二氢茉莉酮.     

Jump Conditions of a Shock with Current in Cylindrical Non-Neutral Plasma

jump conditions of the parameters （mass flow, momentum flow and energy flow） of a shock with current （thereby, electric and magnetic field） in cylindrical non-neutral plasma are presented and derived from Maxwell＇s equations and two fluid equations for electron and ion fluid. The critical Mach number for the shock existence is calculated, which depends on the shock carried current, the ion charge, and the composition of the magnetic and thermal pressure. The numerical results show that both the strength and profiles of the downstream shock parameters will be affected obviously by the shock carried current, electric and magnetic field in the two-dimensional shock.