热解过程中生物质半焦比热容的测定

采用热重-差示量热扫描法(TG-DSC)测量了生物质和一次热解焦炭及不同转化率下半焦的比热容,建立了计算半焦比热容的数学模型并与实验测量结果进行了对比。结果表明,生物质样品和热解焦炭的比热容在60~200℃随温度升高而线性增大。生物质焦炭的比热容低于生物质样品的比热容,从60℃时的1.2 J/(g·K)增大到200℃附近的1.8~2.0 J/(g·K)。生物质半焦比热容随热解转化率的提高而降低。由半焦比热容数学模型计算得到的结果在接近150~200℃时与实验测定的半焦比热容数值基本一致。     

基于焓法的固-液相变格子Boltzmann模型

潜热储能系统中的相变材料固液相变问题是一个重要的多相流动问题.本文研究了在具有不同类型源项下的焓法格子Boltzmann相变模型在还原温度场分布上的特性.为了消除外力项对温度场的额外影响,本文对源项进行了修正,并通过求解单区域相变问题和自然对流相变问题,验证了由Chapman-Enskog展开得到的焓守恒方程中源项的影...     

High-performance Removal of Tetracycline Enabled by Fe0 Nanoparticles Supported on Carbon@ZIF-8

Significant concerns have been raised over the removal of antibiotics, such as tetracyclines(TC) in aquatic environments. Herein, we synthesized a new type of heterogeneous catalyst by supporting Fe⁰ nanopartciles(FeNPs) onto carbon coated ZIF-8 (C@ZIF-8). The carbon layer formed by glucose was beneficial to maintain the morphology and porous structure of ZIF-8, which can also appropriately improve the hydrophobicity of ZIF-8 for enriching the TC. The as-prepared FeNPs-C@ZIF-8 catalyst featured an extreme large specific surface area(1122.16 m²/g), and the supported FeNPs with an average diameter of 6.13 nm exhibited a high dispersity on the supporting matrix of C@ZIF-8. For the removal of tetracycline, the large specific surface area of FeNPs-C@ZIF-8 allowed for an easy access of tetracycline to the FeNPs, while the highly dispersed FeNPs served as actived sites for the efficient degradation of tetracycline. A synergistic effect between adsorption and catalytic degradation of FeNPs(5%, mass fraction)-C@ZIF-8 was proven to be responsible for the high-performance removal of tetracycline with the removal efficiency high up to 93.02% at pH 5, 25℃. The FeNPs-C@ZIF-8 was capable of recycling after activation with supplementary Fe⁰, which still maintained a high removal efficiency of 75.52% in the 5th cycle within 20 min.     

十二醇聚氧乙烯醚的表面性能及在水悬浮剂中的应用

探讨了十二醇聚氧乙烯醚(AEO)的EO链长对其临界胶束浓度(cmc)、表面张力(γcmc)、胶束生成自由能(ΔGm)、分子面积(Acmc)和亲水亲油平衡(HLB)值等表面性能的影响;同时研究了不同EO链长的AEO对质量分数25%代森锰锌水悬浮剂(SC)的流变性能[黏度、储能模量(G’)、流动点时的应变(γflow)、触变性]和物理贮存性能(热贮前悬浮率、热贮后悬浮率和倾倒性)的影响.结果发现,AEO的cmc,γcmc,ΔGm,Acmc和HLB值随着EO链长的增加而增大;AEO能够明显改善代森锰锌SC的黏度,以AEO-9所制备的SC黏度最小,且AEO的EO链长越长,所对应的SC结构恢复越慢,恢复慢的样品其倾倒残留率过高;G’和γflow能反映SC内部结构变化,可作为评价农药SC物理稳定性流变学指标.     

氩离子原子过程参数的系统计算与评估：Ⅰ电子碰撞激发

利用准相对论扭曲波玻恩近似加交换方法，在组态平均近似下，系统地计算了类氢、类氦、类锂氩离子n≤6的各组态之间的碰撞激发过程截面。并和已有的理论结果进行了详细的对比分析。计算结果和相对论扭曲波近似的计算结果符合得很好，相对偏差一般都小于10％。由于没有考虑共振效应。计算的结果与强耦合方法的计算结果在入射电子能量较低的情况下有较大偏差，其他情况则符合较好，相对偏差一般在15％以内。该方法可以方便地计算大量应用所需的原子过程参数。     

Dibaryon Signals in NN Scattering Data and Further Measurement at COSY,LEPS and CSR

The NΔ and ΔΔ dibaryon resonances are studied by calculating the NN scattering phase shifts with explicitly coupling these dibaryon channels in a multi-channel coupling calculation with two quark models.These quark models,the chiral quark model and quark delocalization color screening model,describe the NN S-,D-wave phase shifts below the π production threshold quantitatively well.Both quark models predict the ~1D_2 resonance discovered in NN partial wave phase shift analysis and the J=1 or 3 isoscalar resonance recently reported by CELSIUS-WASA Collaboration are NΔ~5S_2 and ΔΔ~7S_3 resonance,respectively.Further measurements at COSY,LEPS and Lanzhou Cooling Storage Ring(CSR) to check the ΔΔ resonance are discussed.     

Hydrothermal Synthesis,Crystal Structure and Property of a Novel Inorganic-organic Hybrid Compound Based on Phosphomolybdate Anion [H-IDP]4[PMo12O40]·8H2O （IDP = 4-（Imidazole-1-yl）phenol）

A novel compound [H-IDP]4[PMo12O40]·8H2O 1 based on Keggin-type phosphor- molybdate has been synthesized by hydrothermal method and characterized by IR spectroscopy, elemental analyses and single-crystal X-ray diffraction. The composite crystallizes in the mono- clinic system, space group C2/m with a = 13.937（5）, b = 27.033（5）, c = 10.857（5） A, β = 122.489（5）°, V = 3450（2）A^3, Mr = 2611.11, Z = 2, Dc = 2.498 g/cm^3, F（000） = 2486,μ = 2.243 mm^-1, the final R = 0.0568 and wR = 0.1216 for 2707 observed reflections with I 〉 2σ（I）. X-ray structural study shows that 1 consists of a [PMo12O40]^4- polyanion, four protonated IDP cations and eight H2O molecules. In the structure of 1, a 3D network forms by hydrogen bond of [PMo12O40]^4- polyanion, HIDP^＋ cation and H2O molecules. Upon excitation wavelength of 280 nrn in hydroxylic solvents at room temperature, 1 shows fluorescence property.     

25MeV/u 6He在9Be靶上的弹性转移反应研究

报告了25MeV/u ⁶He在⁹Be靶上的弹性散射和弹性转移的实验结果. 用光学模型和一阶DWBA的方法计算了弹性散射和³He集团转移的截面, 计算结果和实验测量基本一致. 计算表明³He在⁹Be中的谱幅度应该明显大于壳模型的理论计算值0.70.     

Dynamics of Genuine Three-Qubit Entanglement in Ising Spin Systems

We investigate the dynamics of genuine three-qubit entanglement in the Ising model of three spins. A scheme is presented for generating the genuine three-qubit entanglement by the nearest-neighbour couplings. The effect of magnetic fields on the dynamics of genuine three-qubit entanglement is also discussed.