添加Fe3+对二氧化钛薄膜吸收光谱及光催化活性的影响

用阳极氧化法制备多孔状的纳米晶二氧化钛薄膜 ,通过往阳极氧化的电解液中添加Fe3 使Fe3 进入二氧化钛薄膜中。研究了掺杂Fe3 对二氧化钛薄膜吸收光谱和光催化活性的影响 ,发现掺杂Fe3 使二氧化钛薄膜对入射光的吸收带边发生红移 ,讨论了其作用机制。     

钚丰度、年龄测定技术研究

扼要地总结了利用自主开发的实用γ谱分析软件和~(239)Pu的γ能峰的相对效率,采用高纯锗探测器对耦合的γ能峰使用非耦合峰推算它的计数分配,从而得到各核素的原子比。根据钚的衰变规律,获得了分析钚材料的年龄、丰度的方法。推算出原子比与丰度、年龄的计算公式,获得了钚材料的年龄和丰度。对已知样品进行了重复测量,将研究分析的结果与PC-FRAM以及保管单位给出的参考值进行了比较。     

Monte Carlo simulation of spectrum changes in a photon beam due to a brass compensator

Monte Carlo simulations were used to study the changes in the incident spectrum when a poly-energetic photon beam passes through a static brass compensator. The simulated photon beam spectrum was evaluated by comparing it against the incident spectra. We also discriminated the changes in the transmitted spectrum produced by each of the microscopic processes. (i.e. Rayleigh scattering, photoelectric effect, Compton scattering, and pair production). The results show that the relevant process in the energy range considered is the Compton Effect, as expected for composite materials of intermediate atomic number and energy range considered.     

Synthesis of Mono-esters of Phenyl-and Substituted Phenylphosphonic Acids and Their Performance in Rare Earth Extraction

Methodsfor the synthesis of acidic phenyl-and substituted phenylphosphonates bearing a branched longchain ester alkyl group are described.These synthetic routes are incomparably superior to other methods in vari-ous aspects including better reaction yield and higher purity of the product.The behaviour of themono(2-butyloctyl)esters and mono(2-methyldodecyl)esters of both phenyl-and o-methylphenylphosphonicacids thus obtained in extraction of lanthanum,praseodymium,neodymium and lutecium as representatives oflight and heavy rare earths,is investigated and discussed on the basis of their chemical structure.The dependenceof the extraction constants and separation factors accords with the Reactivity-Selectivity Principle in solvent ex-traction proposed by us.The composition and structure of the extracted species have been characterized byinfra-red and proton nuclear magnetic resonance spectroscopy in addition to elemental analyses.     

The microscopic approach of sdgIBM—1 and study of the ^192,190,188Os isotopes

From the shell model configurations,valence nucleon effective interactions and fermion E2 transition operator,the sdgIBM-1 Hamiltonian and boson E2 transition operator are derived micoscopically with the help of Dyson boson expansion technique.Spectra and reduced E2 matrix elements are calculated for the ^192,190,188Os isotopes,Present theoritical results fit experimental data quite well.     

茂金属聚乙烯支化表征

采用高分辨率^13C NMR谱直接测定茂金属聚乙烯(mPEs)的支化度及其他微量异种结构单元的组成，并通过流变数据获得DRI指数来表征mPEs长支链结构，对二者的结果进行了比较。发现^13C NMR谱和DRI指数在一定程度上一致反映了mPEs的长支链结构；但当mPEs中存在的少量长支链时，mPEs的流变性能受其影响很大，导致了DRI指数与^13C NMR谱结果差异，以至影响了DRI指数的应用范围。     

Combination of Neural Network and SBFM Algorithm for Monitoring VOCs Distribution by Open Path FTIR Spectrometry

Abstract

In this research, the combination of artificial neural network (ANN) modeling and smooth basis function minimization (SBFM) algorithm were applied to Open Path Fourier transform infrared spectroscopy (OP‐FTIR) for monitoring volatile organic compounds' concentration distribution in the air. ANN was utilized to analyze the measured mixture spectra containing chloroform, methanol, and methylene chloride; Then, SBFM was used to reconstruct each component's concentration distribution. The peak concentration locations and maximum concentration for three components are reconstructed accurately. The methodology presented in this paper has significant importance in detecting leaking source spot and monitoring airborne VOCs transport in chemical industrial workplaces.     

基于近红外光谱的抗扰动脑血氧分析仪

研究了一种近红外光谱抗扰动脑血氧分析仪,用于解决常规脑血氧测试方法检测过程复杂、抗干扰措施繁琐等问题。分析与探讨了影响脑血氧检测精度的因素,选择了合适的三波长近红外探测光源(735nm/805nm/850nm)用于该系统。利用氧合血红蛋白和还原血红蛋白在近红外光波段的吸收特性,得到这两种物质的浓度变化量,推算出了影响血氧检测精度的源端干扰表达式。同时,在检测端同步检测环境光,消除了漏光干扰。最后对上位机得到的原始数据与干扰数据进行处理,实现对大脑前额叶脑血氧波动的实时监测。设计了屏气实验以及源端干扰实验,检验了仪器实验结果的正确性。结果表明:本文所设计的脑血氧分析仪可以有效地检测血红蛋白的变化并能通过源端校正算法抑制源端干扰,干扰抑制比可达70%以上,基本实现了对人体无创、实时、准确监测的目的。     

4-[P-（1-辛基-4，4＇-联吡啶）甲基苯基]-6-苯基-2，2-联吡啶多齿配体的合成

以溴辛烷和4,4’-联吡啶为原料合成了4-[P-（1-辛基-4,4’-联吡啶）甲基苯基]-6-苯基-2,2-联吡啶多齿配体,通过。HNMR确定了所合成的化合物的结构。用循环伏安法和紫外可见分光光度法对化合物的电化学性质、光谱性质进行了研究。     

变色釉的机理研究

在选择合适的工艺条件下制备出呈色效果好的变色釉面砖。分析了釉的化学组成。本文用扫描电镜(SEM),可见光谱,红外光谱和拉曼光谱研究了Na_2O(K_2O)—CaO(MgO)—Al_2O_3—SiO_2系统,基础釉和变色釉的结构。根据光吸收和光散射理论扼要地阐明了釉的呈色机理。用扫描电镜观察了全部试样的液相分离结构并比较了基础釉和变色釉的可见光谱。由此推断液相小滴含有Nd~(3+),Pr~(3+)离子,说明它们在小滴中引起选择性吸收并通过散射而呈色。