Measurement of Complex Permittivity for Dielectric Ceramics at Microwave Frequencies

讨论了平行板开放型介质谐振器技术,建立自动化测试系统,实现对高介低损的微波陶瓷材料复介电常数高效测量结果表明,该系统测试精度较高、重复性好,样品制作简单,可满足微波介质陶资材料测量的实际需要。国家863计划(2001AA325100)资助项

Test of Radio Frequency Ceramic Chip Capacitors

以共面波导作为测试夹具,用射频矢量网络分析仪对小尺寸、小容量的贴片式电容进行扫频测量。结合微波网络理论进行分析,并应用最小二乘法拟合计算后,得出的贴片式电容的测量值与标称值吻合较好,说明该方法可行。国家863计划(2001AA325100)资助项

黑曲霉死菌与活性炭对直接耐晒翠蓝FBL的吸附性能

采用批式实验,系统考察了黑曲霉死菌和活性炭的粉剂投加量,染料初始浓度,pH和反应时间对酞菁染料FBL脱色效果的影响;并采用扫描电镜图像,分析吸附剂的结构变化。结果表明,对于FBL染料的吸附处理,黑曲霉死菌粉剂与活性炭粉剂适宜的吸附条件为:酸性至弱碱性pH下,投加量为8 g/L;黑曲霉死菌粉剂比活性炭粉剂的吸附速度快、脱色性能高、抗染料浓度负荷冲击能力强。扫描电镜图像分析显示,黑曲霉死菌粉剂所具有的多层纤维结构为吸附染料分子提供较大的比表面

软颗粒饲料对“红膏蟹”培育生长、存活和营养成分的影响

将平均体质量(453.6±46.91)g、已交配的健康锯缘青蟹饲养在36cm×26cm×27cm塑料箱中,投喂由鲜杂鱼糜加淀粉、电解多维粉末和卡拉胶制得的软颗粒饲料,培育锯缘青蟹\"红膏蟹\"。试验结果表明,29~31d育成\"红膏蟹\";投喂软颗粒饲料的青蟹肌肉占比(59.89%~60.84%)显著低于投喂冰鲜杂鱼和贝类的青蟹(P<0.05),但培育成活率(96.9%~97.1%)、质量增加率(67.26%~69.47%)、特定增长率(1.39%/d~1.53%/d)、可食部分(65.67%~66.32%)和红膏占比(17.36%~17.68%)均显著高于投喂冰鲜杂鱼和贝类的青蟹(P<0.05);软颗粒饲料组\"红膏蟹\"肌肉中粗蛋白、脂肪和水分的含量分别为19.9%、0.8%和75.1%,生殖腺中粗蛋白、脂肪和水分含量分别为30.59%、14.50%和54.69%,肌肉和生殖腺中必需氨基酸的含量分别为5.59%和8.14%,呈味氨基酸的含量分别为6.50%和9.90%,氨基酸评分分别为71.7和100,肌肉和生殖腺中饱和脂肪酸总量分别为44.0%和49.2%,单不饱和脂肪酸总量分别为24.6%和29.2%,多不饱和脂肪酸总量分别为27.9%和15.7%;投喂软颗粒饲料提高了青蟹肌肉中粗蛋白的含量和青蟹的营养价值。福建省星火项目(2016S0055);;福建省公益性项目(2018R1037-1);;2017年宁德市现代渔业结构调整资金资助项目(宁财农指[017]65号);;宁德师范学院科研发展资金资助项目(2016FZ24

HPLC Determination of Chlorogenic Acid,Baicalin and Puerarin in a TCM Preparation of ＂Xiao-er Resuqing＂ Oral Liquor

用高效液相色谱法测定一种中成药"小儿热速清"口服液中的绿原酸、黄芩苷和葛根素含量。采用Zorbax SB-C18色谱柱分离,以不同比例混合的甲醇和乙酸-水(1+99)溶液为流动相,进行梯度洗脱,在327nm波长处测定绿原酸、黄芩苷的含量,在250nm波长处测定葛根素的含量。绿原酸质量浓度在3.0～30.0mg.L-1范围内呈线性关系;黄芩苷质量浓度在2.7～27.0mg.L-1范围内呈线性关系;葛根素质量浓度在3.1～31.0mg.L-1范围内呈线性关系。方法的平均回收率为99.5%,99.8%,99.3%,相对标准偏差(n=6)分别为0.88%,0.84%,1.0%。The effective components,i.e.chlorogenic acid,baicalin and puerarin,in a TCM preparation,named ＂xiao-er resuqing＂ oral liquor,were determined by HPLC.The Zorbax SB-C18 chromatographic column was used as the stationary phase and mixtures of methanol and CH3COOH-H2O（1＋99） solution with various proportions were used in the gradient elution.UV detections at 327 nm（for chlorogenic aicd and baicalin） and at 250 nm（for puerarin） were adopted in the determinations.Linear relationships between values of peak area and mass concentration of the 3 compounds were found in the following ranges of ① 3.0-30.0 mg·L-1,② 2.7-27.0 mg·L-1 and ③ 3.1-31.0 mg·L-1 respectively.Values of average recovery obtained were 99.5%（for chlorogenic acid）,99.8%（for baicalin） and 99.3%（for puerarin）.Values of RSD′s（n=6） found for the 3 compounds were 0.88%,0.84% and 1.0% respectively

Quantum Chemistry Study on the Formation of Clusters Ni_xZr_(n-x) (n≤6) in Metallic Glass

根据化学键理论与拓朴原理 ,设计了 Nix Zr6 -x团簇的可能几何结构 ,并用从头算方法进行了构型优化 .结果表明 ,小团簇 Nix Zrn-x(n≤ 5)倾向于生成平面结构 ,而 6原子团簇则是八面体或三棱柱构型更稳定 .在大部分情况下 Zr原子把电荷转移给 Ni原子Fourteen Ni xZr 4-x , sixteen Ni xZr 5-x and twentythree Ni xZr 6-x clusters were proposed with chemical bond theory and topological principle and then optimized geometrically with ab initio calculations. It has been shown that nickel atoms tend to combine with zirconium atoms to form plane structure in small clusters(n≤5), but the six atom cluster enjoys to take shape of octahedron or triprism. In many cases the charge transfer is from zirconium atom to nickel atom.国家自然科学基金!(29892166,29983001);; 教育部博士点基金资助项

“蟹公寓”培育红膏蟹养殖技术研究

红膏蟹为青蟹生长发育的风味好、营养价值最高的特殊阶段（卵巢成熟发育的青蟹通常称为红膏蟹）,其价格也为普通青蟹的2倍以上,且市场上通常供不应求,但目前存在培育成活率低、养殖设施设备差等问题。因此,本文研究了一种青蟹培育红膏蟹的专用设备——“蟹公寓”,旨在为实现工厂化培育红膏蟹养殖模式和青蟹产业的可持续发展提供现实的生产经验和理论依据

Preparation and Ｒecognition Properties of CuO Nanoparticles

为了提高苯巴比妥分子印迹传感器的灵敏度,以甲基丙烯酸为功能单体,马来松香丙烯酸乙二醇酯为交联剂,热聚合了一种纳米氧化铜掺杂的苯巴比妥分子印迹传感器。分别采用循环伏安法(CV)、电化学交流阻抗法(EIS)、差分脉冲伏安法(DPV)、计时电流法(CA)对这种印迹传感器的电化学性能进行了研究。分别采用红外光谱、扫描电镜对此印迹传感器的结构及形貌进行了表征。结果表明,以铁氰化钾为分子探针的间接检测中,铁氰化钾的峰电流值与苯巴比妥的浓度在1.2×107~1.5×104mol/L范围内呈现良好的线性关系(线性相关系数R=0.9984),检出限(S/N=3)为8.2×109mol/L。将此印迹传感器用于实际应用,回收率在96.5%~103.0%之间。Abstract To improve the sensitivity，a CuO nanoparticle doped in molecularly imprinted polymer ( MIP) film for the determination of phenobarbital was prepared by using methacrylic acid as functional monomers， ethylene glycol maleic rosinate acrylate as a cross linking agent by thermal polymerization method． The electrochemical properties of the nano-doped sensor were investigated using cyclic voltammetry ( CV) ， differential pulse voltammetry ( DPV ) ， electrochemical impedance spectroscopy ( EIS ) and chronoamperometry ( CA) ． The chemical structures and morphologies of the imprinted films were characterized using Fourier transform infrared spectroscopy and scanning electron microscopy． The results indicated that the sensors response value of peak current showed a linear dependence on the phenobarbital concentration in the ranges of 1．2×10 7－1．5×10 4 mol /L of phenobarbital． ( Linear regression coefficient = 0．9984) with the detection limit ( S /N = 3) of 8． 2 × 10 9 mmol /L． The prepared sensor was successfully applied to the determination of phenobarbital in practical samples with recovery ranging from 96．5% to 103．0%．国家自然科学基金(No.21365004);广西自然科学重点基金(2013GXNSFDA019006);广西高等学校高水平创新团队及卓越学者资助计划(No.桂教人[2014]7号);广西研究生教育创新计划资助项目(YCSZ2014120)资

Preparation and Electrochemical Properties of Phenobarbital

了改善分子印迹传感器的灵敏度,在四丁基高氯酸铵的支持电解质溶液中,以甲基丙烯酸为功能单体,马来松香丙烯酸乙二醇酯为交联剂在纳米氧化铜修饰过的玻碳电极上电聚合了一种苯巴比妥(PB)识别性能的分子印迹传感膜.采用循环伏安(CV)法、差分脉冲伏安(DPV)法及交流阻抗(EIS)法对这种纳米氧化铜修饰过的印迹及非印迹电极的电化学性能进行了研究,结果显示纳米氧化铜修饰过的印迹及非印迹电极的电化学性能完全不同.X射线衍射(XRD)证实纳米粒子为氧化铜.采用扫描电镜(SEM)对纳米氧化铜修饰过的印迹传感器的形貌进行分析,发现纳米氧化铜分散在电极表面,改善了修饰印迹传感器的识别点.差分脉冲伏安法(DPV)表明苯巴比妥的浓度在1.0×10-8-1.8×10-4mol·L-1范围内呈现良好的线性关系(线性相关系数R=0.9994);检出限2.3×10-9mol·L-1(信噪比(S/N)=3).研究结果表明纳米氧化铜修饰过的印迹传感器具有较高灵敏度及选择性.此印迹传感器能用于实际样品中苯巴比妥的检测,加标回收率在95.0%-102.5%.Abstract: To improve the sensitivity of molecular imprinted electrochemical sensors, a molecularly imprinted polymer (MIP) film for the determination of phenobarbital (PB) was electropolymerized on a CuO nanoparticlemodified glassy carbon electrode. Methacrylic acid was used as the functional monomer and ethylene glycol maleic rosinate acrylate as a cross-linking agent in the presence of supporting electrolyte (tetrabutylammonium perchlorate). The electrochemical properties of CuO nanoparticle-modified molecularly imprinted and non-imprinted polymer (NIP) sensors were investigated by cyclic voltammetry (CV), differential pulse voltammetry (DPV), and electrochemical impedance spectroscopy (EIS). The results showed that the electrochemical properties of the CuO nanoparticle-modified MIP sensor were completely different from those of NIP sensors. X-ray diffraction confirmed that the nanoparticles were CuO. The morphology of the CuO nanoparticle-modified MIP sensor was examined under a scanning electron microscope. The CuO nanoparticles were uniformly distributed on the surface of the modified glassy carbon electrode, which improved the recognition sites of the modified MIP sensor. The response value of the DPV peak current showed linear dependence on the PB concentration in the range 1.0×10-8 to 1.8×10-4 mol∙L-1 (linear regression coefficient =0.9994) with a detection limit (S/N=3) of 2.3×10-9 mol∙L-1. The results indicated that the CuO nanoparticle-modified MIP sensor is one of the most sensitive and selective sensors for PB determination. The prepared sensor was successfully applied for the determination of PB in practical samples and the recovery ranged from 95.0% to 102.5%.广西教育厅科研项目(2013YB068);国家自然科学基金(21365004);广西自然科学重点基金(2013GXNSFDA019006);广西高等学校高水平创新团队及卓越学者资助计划(桂教人[2014]7号);广西研究生教育创新计划项目(gxun-chx2014120)资