不同负荷下餐厨垃圾与水稻秸秆共消化厌氧产氢研究

进料负荷对餐厨垃圾与水稻秸秆混合厌氧发酵产氢过程有重要影响. 以进料负荷为影响因子, 设置温度均为55℃的餐厨垃圾与水稻秸秆混合厌氧发酵产氢实验, 其中进料负荷(以VS计)分别设置为(A)5kg?m-3?d-1、(B)10kg?m-3?d-1、(C)15kg?m-3?d-1, 分析厌氧产氢过程中产气量、产氢速率、pH、VFAs、氨氮、SCOD等参数的变化. 实验结果表明: B组发酵底物产气量最大, 为8664mL, 产氢速率也最大, 为748.3mL?h-1, 反应过程中pH始终维持在5.5±0.1内, 是厌氧产氢的最佳范围. 实验结束时, 各组VFAs、氨氮浓度分别为7292.46、8248.35、8558.24mg?L-1和544.48、754.31、1458.33mg?L-1. 同时各组SCOD浓度变化趋势相似. 在研究范围的最佳进料负荷下, 进行回流比分别为10%、30%、50%的实验, 结果显示30%回流比的产氢量最大, 为56039mL, 同时运行过程中系统稳定性较好. 综上所述, 进料负荷为10kg?m-3?d-1, 30%回流比的餐厨垃圾与水稻秸秆混合厌氧发酵产氢时, 微生物活性较好, 能够产生更多的氢气. 这一结果可为餐厨垃圾资源化提供参考依据.     

Bernoulli泛函空间中广义计数算子的表示

得到离散时间正规鞅平方可积泛函空间L^{\mathrm{2}}(M)中广义计数算子N_h的5种表示：（1）量子Bernoulli噪声（quantum Bernoulli noises,QBN）\{{?}_k,{?}_k^{\mathrm{*}};k\ge \mathrm{0}\}的加权表示;（2）N_h的谱表示,广义计数算子N_h以h-计数测度{\#}_h的值域为其点谱;（3）N_h的“对角化”表示,N_h可表示为L^{\mathrm{2}}(M)的标准正交基\{Z_{\sigma };\sigma \in \mathrm{\Gamma }\}所生成的一维对角化正交投影算子的加权极限;（4）广义Skorohod积分-广义随机梯度表示,N_h可表示为互共轭算子{\delta }_h和{?}_h的复合算子;（5）对\mathbf{N}上的任意非负函数h,可构造一列有界广义计数算子,N_h恰为该有界广义计数算子的强极限,当h可和时,N_h为该有界广义计数算子的一致极限。     

超高效液相色谱-串联质谱法测定蜂蜜中抗生素和农药浓度

基于快速有效的基质净化方法,结合超高效液相色谱-串联质谱技术,建立了测定蜂蜜中39种抗生素及25种农药的检测方法.蜂蜜样品经乙腈+水（v/v=8：2）提取,用PRiME HLB净化,超高效液相色谱-串联质谱（ultra-performance liquid chromatography tandem mass spectrometry,UPLC-MS/MS）分析测定,通过多反应监测模式（MRM）分析目标化合物,并进行基质标准曲线定量.在测定浓度范围内呈良好线性关系,相关系数大于0.99;农兽药的检出限为0.02~3.8 μg·kg^-1,定量限为0.1~11.5 μg·kg^-1;在3档浓度的添加回收实验中,39种抗生素的回收率在72%~119%内,25种农药的回收率在72%~115%内,相对标准偏差均小于15%.随机抽取浙江市场上在售的52份蜂蜜样进行检测分析和膳食暴露评估,共检出罗红霉素、诺氟沙星和环丙沙星3种抗生素,检出率分别为2.6%,8.6%和3.9%,浓度分别为59.6~214.4,4.7~1 486.3和5.9~215.1 μg·kg^-1.膳食暴露评估结果表明,蜂蜜中抗生素残留对10岁以下组群的风险高于其他组群、女性消费者高于男性消费者;% ADI<100,说明膳食暴露评估风险水平尚可接受.因在计算中存在诸多不确定性因素,对组群的风险评估尚需进一步分析.     

Line width analysis of a tunable optical filter based on free-space optics

The line width of a tunable optical filter based on free-space optics was analyzed. The relationship between the line width and the Gaussian beam waist was theoretically derived and experimentally verified. The experimental results meet the theoretical analysis well, which is beneficial for the design of a tunable optical filter based on free-space optics.     

新颖的微流控电调谐空间光开关

提出了一种微流控电调谐非机械空间光开关器件,该器件的基本形式为“光输入阵列+光交换空间+光输出阵列”的结构,采用“水/油/水”液体棱镜作为偏光控制单元.在特定电压范围（30~110 V）内,通过电润湿效应作用的液体棱镜光束偏转角可在约－15°~15°之间连续可调.由此可构造多种平面甚至立体光开关阵列.     

空间雷电探测实时采集定位系统

星载雷电探测定位系统是利用光学探测器探测闪电事件的地理位置和光脉冲波形,系统采用CPLD+DSP的数字图像处理方案,利用了CPLD复杂逻辑可编程特性将系统的部分或全部功能集成在一片CPLD上,减小了系统硬件复杂程度,节省了印制版空间.利用DSP高速数字信号处理特性完成实时处理图像数据的功能.系统用CPLD完成图像信号的采集、编码和存储控制,缩小了星载设备体积,简化了电路结构;用DSP完成大量图像数据处理工作,提高了系统工作的实时性.     

Modified gravity on the brane and dark energy

We analyze the dynamics of an AdS₅ braneworld with matter fields when gravity is allowed to deviate from the Einstein form on the brane. We consider exact five-dimensional warped solutions which are associated with conformal bulk fields of weight –4 and describe on the brane the following three dynamics: those of inhomogeneous dust, of generalized dark radiation, and of homogeneous polytropic dark energy. We show that, with modified gravity on the brane, the existence of such dynamical geometries requires the presence of non-conformal matter fields confined to the brane.     

Comparison on the mixture rules of sound velocities used in characterizing biomedium components

In this paper, several mixtrue rules of sound velocity and their useful ness in characterizing the components of biomedium are analysed. It is pointed out that for characterizing the components of biomedium, the rules are compatible with each other under certain conditions, and the errors between each rule and real sound velocity are diffferent. It concludes that there is no general rule suitable for various media among above mentioned rules.     

Realization of an All-Fibre Self-Organization Intra-Cavity Coherent Erbium-Doped Fibre Laser

An intra-cavity coherent coupling Michelson Er-doped fibre （EDF） laser （MCEDFL） is proposed and demonstrated. Characteristics of the MCEDFL are investigated. It is found that the MCEDFL with a polarizer can be coherent combined effectively. By the experiment based on fibre Bragg gratings （FBGs） with different reflectivity, we find that the reflectivity of the FBG play a vital role in improving the performance of the MCEDFL. This outcome adequately shows many favourable features, such as high efficiency, easy operation, and simple all-fibre configuration.     

JMCT优化查找策略的实现

分析连续能量点截面中子输运程序JMCT中区间查找的时间复杂度.针对主能量网格,裂变释放中子数和不可分辨共振网格进行区间映射加速,并以等差和等比序列网格为例,对比分析不同散列网格的质量.最后选择寿期初与寿期中燃料棒栅元的k_∞问题进行对比测试.结果显示,对于核素数目较多的输运问题,优化查找策略具有很好的加速效果.