盾构渣土基碳复合陶粒的制备及除磷性能

以固体废弃物地铁盾构渣土、稻草秸秆和氧化镁为主要原料,通过烧结法制备了一种盾构渣土基碳复合陶粒。考察了陶粒吸附磷的主要影响因素及平衡吸附量,并采用模型对实验数据进行拟合分析。结果表明,当盾构渣土、稻草秸秆粉末和氧化镁质量比为7∶2∶1,在最佳烧结条件700℃烧结可得到除磷性能最佳的陶粒。当吸附pH=6.3时,陶粒具有较高的磷吸附性能。吸附在12 h内基本能达到吸附平衡,该过程适合准二级动力学方程。盾构渣土基碳复合陶粒对磷酸盐的吸附符合Temkin等温模型,随温度升高吸附量逐渐增大,40℃下最大吸附量为12.76 mg/g。热力学参数ΔH=5.64 k J/mol0,ΔS=8.00 J/(K·mol)0,ΔG=3.16 k J/mol0,呈吸热、非自发的热力学特征,陶粒吸附磷后可通过2.0 mol/L的氢氧化钠溶液重新解吸回收。     

固相萃取/液相色谱-串联质谱法测定食品中二甲基黄

建立了液相色谱-串联质谱(LC-MS/MS)测定食品中二甲基黄(DMY)的分析方法。样品经乙酸乙酯提取,二甲基黄专用固相萃取小柱(ProElut DMY SPE)净化,XDB-C18色谱柱(50 mm×4.6 mm,1.8μm)分离,并以5mmol/L乙酸铵水溶液(含0.1%(v/v)甲酸)-乙腈(含0.1%(v/v)甲酸)为流动相,梯度洗脱,电喷雾正离子模式(ESI~+)电离,多反应监测模式(MRM)检测,内标法定量。结果表明,DMY在0~50μg/L范围内线性关系良好,相关系数(r~2)均大于0.999。方法的检出限(LOD,S/N3)和定量限(LOQ,S/N10)分别为2μg/kg和10μg/kg。不同食品基质中,DMY在10、20和100μg/kg的添加水平下的平均加标回收率为93.3%~98.9%,相对标准偏差为1.6%~3.9%(n=6)。该方法有效补偿了液相色谱-串联质谱检测过程中的离子化抑制效应,灵敏度和准确度高,适用于腐乳、辣椒酱、禽蛋、豆干、糖果和火腿中DMY的测定。     

原油价格冲击对中国股票市场的非对称影响研究

原油价格冲击对股票市场的非对称影响一直是学者们关注和研究的热点问题.借鉴Kilian(2009)提出的SVAR方法将油价冲击分解为供给冲击、总需求冲击和原油特定需求冲击,并运用非线性自回归分布滞后(NARDL)模型分析了结构性油价冲击对中国股票市场(上证综指、深证成指)在长期和短期的非对称影响.研究结果表明,长期内,仅原油特定需求冲击对中国股市产生显著影响,但并不存在非对称效应.短期内,总需求冲击和原油特定需求冲击都能显著影响中国股市,且总需求冲击的影响还具有非对称影响效应.而供给冲击不管在长期还是短期均不能显著影响中国股票市场.     

Synthesis and Crystal Structure of a Novel Ethyl 5-(4-(2-Phenylacetamido)phenyl)-1H-pyrazole-3-carboxylate as an Acrosin Inhibitor

The title compound (ethyl5-(4-(2-phenylacetamido)phenyl)-1H-pyrazole-3-carboxy- late, C20H19N3O3) was synthesized by the reaction of Claisen condensation, cyclization, reduction and acylation. The structure was characterized by X-ray diffraction, MS, NMR and IR. It belongs to the monoclinic system, space group C2/c with a = 22.723(9), b = 9.324(4), c = 18.890(8) , β = 114.259(6)°, V = 3649(3) 3, Dc = 1.272 Mg·m-3, Z = 8, Mr = 349.38, μ = 0.087 mm-1, F(000) = 1472, the final R = 0.0615 and wR = 0.1643. The biological test shows that the title compound has a moderate acrosin inhibition activity.     

化学交联聚乙烯醇改性纤维素碱性阴离子交换复合膜的制备与性能

高稳定性碱性阴离子交换膜的制备已成为碱性固体电解质膜研究领域的一大热点.本文通过聚乙烯醇化学交联改性制备出了季铵化羟乙基乙氧基纤维素碱性阴离子交换膜（PVA/QHECE）.采用傅里叶变换红外（FTIR）光谱、热重（TG）分析、交流（AC）阻抗等方法考察了复合膜的分子结构、热稳定性、耐碱稳定性及离子电导率等性能.详尽考察了交联时间、交联剂含量、聚合物组成对成膜力学强度、含水率以及OH^-电导率的影响.实验结果表明:随着交联时间的增加,膜的溶胀率降低,力学强度随之增强,而离子电导率随膜含水率的降低没有发生明显变化,室温下OH^-的电导率在3.26×10^-4-4.44×10^-4S·cm^-1范围内变化.热重分析结果显示:掺入42.9%的QHECE时,膜的热分解温度达260℃.此外,将PVA/QHECE膜在6 mol·L^-4 KOH浓碱溶液中80℃浸渍处理168 h,膜的电导率从4.90×10^-4S·cm^-1提高到9.68×10^-4S·cm^-1,而膜的外观和力学强度以及含水率未发生明显变化,这一结果表明该膜具有很好的耐碱化学稳定性,有望作为一种新型的碱性燃料电池用离子交换膜.     

EPR Effect of Amphiphilic Copolymer Micelles Observed by Fluorescent Imaging

Enhanced permeation and retention(EPR) targeting effect of rhodamine B labeled PEG-b-P(LA-co-DHP) [PEG:poly(ethylene glycol);LA:L-lactide;DHP:2,2-dihydroxylmethyl-propylene carbonate] micelles(RhB-micelles) was observed in H22 liver cancer bearing mice.The RhB-micelles were prepared by conjugating rhodamine B with the DHP units of amphiphilic block copolymer PEG-b-P(LA-co-DHP) followed by subsequent self-assembling of the conjugate.The parent copolymer PEG-b-P(LA-co-DHP) was synthesized by ring-opening copo...     

醌茜素显色分光光度法测定奋乃静

研究了奋乃静(Perphenazine,PPH)与醌茜素(Quinalizarin,QLZ)之间的荷移光谱及其性能。奋乃静作为电子给体,醌茜素作为电子受体,两者在乙醇-水介质中反应生成荷移络合物。该络合物的λmax=568nm,表观摩尔吸光系数是3.39×103 L.mol-1.cm-1,奋乃静药物质量浓度在0～35mg/L范围内服从比耳定律,相对标准偏差为1.23%(n=6),回收率为98.9%～102.4%。     

Studies of modification of HDPE and interfacial interaction of its composites with sericite

Ultraviolet irradiation, which is environment friendly and without any chemical pollution, was used to functionalize high‐density polyethylene (HDPE) and to improve the interfacial interaction of its composites with sericite in this study. The oxygen‐containing groups of C?O, C‐O, and C(?O)O were quickly introduced onto molecular chains of HDPE by ultraviolet irradiation in ozone atmosphere and the contents of the introduced oxygen‐containing groups increased with increasing the modification time. It is important to note that the irradiation time greatly decreased compared to that in air or oxygen atmosphere. After modification, the molecular weight of the irradiated HDPE decreased and its distribution became wider. The irradiated HDPE in ozone was not crosslinked, which is an advantage over the same reaction in air or oxygen atmosphere. With increasing the irradiation time, the melting temperature of the irradiated HDPE lightly decreased, while its crystallinity, hydrophilicity, and fluidity increased. The composites of HDPE/sericite were prepared. The results showed that the dispersion of sericite in the matrix and the interfacial interaction of sericite with the matrix were markedly improved for the irradiated HDPE/sericite composites. As a result, the irradiated HDPE/sericite composites showed significantly increased tensile yield strength and notched impact strength. Copyright © 2010 John Wiley & Sons, Ltd.     

考虑公平偏好的工程供应链质量优化研究

针对工程供应链中业主与承包商群体的一对多结构,考虑如何通过收益激励方式对工程质量进行优化.从工程全生命周期角度构建了承包商群体的多阶段质量激励模型,通过计算实验方法探讨了承包商具有公平偏好情景下激励模型的优化效率.研究表明:基于业主角度,收益激励是一种有效的激励方式;承包商个体的公平偏好对激励效果会产生负面影响;激励力度的确定需要遵循“适度原则”和“系统思维”;业主要具有“演化观念”,并摆脱只关注短期效率的“近视”观念,才能达到激励效率的持续高效.     

多地区情形下制造商渠道选择与定价策略研究

针对国内不同地区间市场差异以及国内的制造商采取地区间差异化定价策略这一现状,构建了传统供应链模式下制造商定价模型,证明了其采取地区差异化定价可以获得更多利润这一结论.研究了跨地区双渠道背景下制造商主导的供应链定价策略问题.分别通过理论和数值计算分析了制造商的3种不同定价策略对制造商和零售商的不同影响,并与基本定价策略下制造商和零售商利润进行比较分析,给出了相关结论.