Thermodynamic analysis of the theoretical energy consumption in the removal of organic contaminants by physical methods

The essential requirements for evaluating the sustainable development of a system and the thermodynamic framework of the energy conservation mechanism in the waste-removal process are proposed.A thermodynamic method of analysis based on the first and second laws of thermodynamics is suggested as a means to analyze the theoretical energy consumption for the removal of organic contaminants by physical methods.Moreover,the theoretical energy consumption for the removal by physical methods of different kinds of...     

Coolant choice for the central beryllium pipe of the BESⅢ beam pipe

In order to take away much more heat on the BESⅢ beam pipe to guarantee the normal particle detection,EDM-1(oil No.1 for electric discharge machining),with good thermal and flow properties was selected as the candidate coolant for the central beryllium pipe of the BESⅢ beam pipe.Its cooling character was studied and dynamic corrosion experiment was undertaken to examine its corrosion on beryllium.The experiment results show that EDM-1 would corrode the beryllium 19.9 μm in the depth in 10 years,which is weak and can be neglected.Finite element simulation and experiment research were taken to check the cooling capacity of EDM-1.The results show that EDM-1 can meet the cooling requirement of the central beryllium pipe.Now EDM-1 is being used to cool the central beryllium pipe of the BESⅢ beam pipe.     

Two Ion-pair Complexes Constructed by[M（mnt）2]n- （M=Ni,Co,mnt = Maleonitriledithiolate）:Syntheses,Characterization and Thermal Stability

Two new ion-pair complexes [Co(BBP)2]2[Ni(mnt)2]Cl2·4DMF·2H2O(1, BBP =2,6-bis(benzimidazol-2'-yl) pyridine, mnt = maleonitriledithiolate) and [(Py)2CH2][Co(mnt)2]2·4DMF(2) have been synthesized and characterized by elemental analyses, IR spectroscopy,thermogravimetric analyses and single-crystal X-ray diffraction. X-ray diffraction studies show that complex 1 crystallizes in monoclinic, space group P21/c. The crystal of 2 belongs to a triclinic system with space group P1. Due to the hydrogen bonding interactions, anions and cations formed the mixed packing in complex 1 while the anions and cations formed segregated columns in 2. In addition, thermogravimetric analyses of the two complexes are also investigated.     

方位偶极声波远探测技术研究与应用

偶极横波远探测测井技术是当前缝洞型和复杂储层油气勘探开发和评价不可缺少的技术手段。常规偶极远探测技术受限于180?方位的不确定性,难以判别缝洞等地质体的真实方位。采用双偶极错位发射多分量阵列接收研究偶极方位识别方法。首先以传统正交偶极模式获得地质体方位探测结果,再以45?错位角发射偶极声波信号,通过多个邻近接收器的波形差的组合以及反射波在仪器孔径上的时间延迟来区分方位,进一步压制伪像干扰获得地质体真实的方位成像结果。针对弱反射信号,在硬件上,研究了多分量有源接收器阵列声系,有效提升了偶极声波信号信噪比,结合动态增益控制提升反射波幅度;研究了双偶极宽频发射器与多模式发射技术,提高偶极发射功率,保证了偶极声波信号在地层中的远距离传播与反射。数值仿真与实际测井数据表明,双偶极方位识别方法可行,有助于偶极横波远探测技术的进一步发展和应用。     

水泥老化过程中水动态的准弹性中子散射(QENS)谱分析

准弹性中子散射(quasi-elastic neutron scattering, QENS)实验是研究水泥老化过程中水动态的一种新颖的实验方法.本文利用老化时间分别为7, 14和30 d水泥样品的QENS谱实验数据, 通过应用四个高斯项的和的能量分辨函数R(Q, E)代替一个高斯项的能量分辨函数来改进经验扩散模型(empirical diffusion model, EDM), 再进行非线性最小二乘拟合.由此导出水泥样品中水动态的相关物理参数: 不动水数密度A, 自由水指数FWI=B₁/(A+B₁+B₂), 洛伦兹函数的半高宽Γ, 移动水跳跃之间的平均停留时间τ ₀及自扩散系数D_t, 而且可得出更为精准的QENS谱拟合曲线.拟合得到的物理参数可定量描述水泥老化过程中水动态过程, 从而为QENS实验在水泥老化过程中水动态研究的应用提供一种合理实用的谱分析方法.     

周期性极化铌酸锂晶体的电光复合逻辑门

根据准相位匹配线性电光效应耦合波理论,基于单个周期性极化铌酸锂晶体,提出了外电场可控的电光复合与门、或门的逻辑计算方法.采用级联周期性极化铌酸锂晶体,探讨了外电场可控的电光复合逻辑异或门、半加法器、半减法器的逻辑计算方法.在外加电场分别为0.184KV/mm和0.368KV/mm条件下,分析了光波的波长、方位角和极角、晶体的温度对逻辑输出的影响.研究结果表明,基本逻辑门的逻辑计算能够成功实现,但其逻辑计算对光波波长、晶体温度、方位角和极化角非常敏感,这些参量轻微的变化会导致逻辑输出的改变.该方案可推广到更为复杂的基本逻辑门以及三个以上逻辑输入与输出的基本逻辑门中.     

基于ARDL模型和引力模型的环境规制对产品出口竞争力的影响研究

将环境规制划分为内部与外部规制,分别使用ARDL模型和引力模型,利用中国对欧盟27国1996-2010年出口数据,选取环境产品作为对照组,就中国与欧盟环境规制对我国产品出口竞争力的影响进行实证研究.研究发现:国内环境规制不是影响我国产品出口竞争力的主要因素,说明中国环境管制相对宽松且不成体系,对创新的激励作用不显著导致其对竞争力的提升作用受限;欧盟环境规制显著改善了我国非环境产品的贸易表现,对环境产品影响则不甚明显.研究结果为我国贸易与环境的协调发展提供了建议与支持.     

灰色预测法的进一步推广及应用

把原始时间序列进行多次累加,产生多个新序列,研究它们之间的关系,建立多元线性(或非线性)回归模型.给定显著性水平α,对回归方程进行显著性检验,在置信度1-α下,利用微分,差分关系建立相应的高阶微分方程,从而实现对原序列的预测或控制.该方法进一步推广了灰色预测法,为时间序列建模提供了一个新手段,一些著名的微分方程模型成为这一方法的特例,最后,用该方法对中国1979年至2008年的GDP序列建立微分方程模型并进行预测.     

Enthalpic interactions of N-glycylglycine with xylitol in aqueous sodium chloride and potassium chloride solutions at T = 298.15 K

The mixing enthalpies of N-glycylglycine with xylitol and their respective enthalpies of dilution in aqueous sodium chloride and potassium chloride solutions have been determined by using flow-mix isothermal microcalorimetry at the temperature of 298.15 K. These experimental results have been used to determine the heterotactic enthalpic interaction coefficients (h_xy, h_xxy, and h_xyy) according to the McMillan–Mayer theory. It has been found that the heterotactic enthalpic pairwise interaction coefficients h_xy between N-glycylglycine and xylitol in aqueous sodium chloride and potassium chloride solutions are negative and become less negative with an increase in the molality of sodium chloride or potassium chloride. The results are discussed in terms of solute–solute and solute–solvent interactions.     

Clustering Structure of 10Be Studied with the Deformed RMF＋BCS Method

We investigate the nucleus 10Be using the deformed relativistic mean field （RMF） model and BCS theory. The calculated density distribution suggests two α clusters in the nucleus 10Be. According to BCS theory, the two valence neutrons transit to the first excited state 02＋ in a pair and form a 2-n cluster. By comparing the two neutron separation energy （S2n） with the single neutron separation energy （Sn）, and analyzing the difference between the neutron and proton rms radii （Rn-Rp） calculated by the deformed RMF, we suggest that 10Be is the best candidate for a two-neutron skin. The two-neutron skin clings to the 2α clusters closely and makes the two α clusters have cross and chain distribution.