Highly sensitive fluorescence quantification of irinotecan in biological fluids with the aid of second-order advantage

<正>A rapid,green and highly sensitive excitation-emission matrix(EEM) fluorescence method was proposed for analysis of irinotecan(CPT-11) in biological fluids including human plasma and urine samples of uncalibrated interferences with the aid of second-order advantage.Due to the serious spectral overlapping from biological matrices,the parallel factor analysis(PARAFAC) and the alternating normalization-weighted error(ANWE) have been recommended to perform directly calibration and overcome the problem which makes the traditional fluorospectrophotometer in trouble.Satisfactory results can be achieved.Furthermore, performance of the proposed method was evaluated based on figures of merit and some statistical parameters.The accuracy of both algorithms was validated by the elliptical joint confidence region(EJCR) test.The precision and repeatability were also investigated by the relative standard deviations(RSDs) of intra-day and inter-day.     

Resource allocation for end-to-end QoS provisioning in a hybrid wireless WCDMA and wireline IP-based DiffServ network

In the future UMTS network, the heterogeneous traffics of multimedia services demand various QoS provisioning. At the same time, the seamlessly conveying of information between mobile users and a hybrid network requires the networking from wireless to wireline domains. However, in both academia and industries, the end-to-end QoS provisioning in the integration of wireline and wireless networks remains a challenge. In this paper, a modeling of a hybrid wireless WCDMA and wireline IP-based DiffServ network is presented to investigate the resource allocation for end-to-end QoS provisioning for multimedia services. In the wireless domain, the mathematical modeling of the cross-layer model including the physical layer, the link layer and the network layer is built. The connection admission control scheme is implemented based on the cross-layer model to determine the amount of resource for different services. In the wireline domain, we define the mapping of QoS classes between UMTS and DiffServ networks according to different QoS requirements. We propose a bandwidth allocation scheme to provide satisfactory packet loss and delay guarantee in DiffServ networks. The final end-to-end admission control scheme combines the resource allocation and admission control in both wireless and wireline domains. The analytical and simulation results show that the proposed resource allocation and admission control schemes work cooperatively in the presented hybrid wireless and wireline networks to guarantee the end-to-end QoS requirements for multimedia services.     

Novel Bonding Character of the Cyclic AlS2 and GaS2 Systems

The geometries, the harmonic vibrational frequencies and the bonding properties have been predicted for cyclic AlS2 and GaS₂ species at the density functional theory (DFT), MPn (n = 2, 3, 4), QCISD(T) and CCSD(T) levels with 6‐311 + G (2df) basis set. The novel bonding character was discussed.     

Determination of polyamines by high-performance liquid chromatography with chemiluminescence detection

A method was developed for the determination of polyamines (PA) by high-performance liquid chromatography with chemiluminescence detection. It is based on the unsaturated complex of PA with Cu(II) which had a strong catalytic effect on the luminol-H₂O₂ chemiluminescence reaction. The separation of PA was carried out on a reveres phase C18 column using methanol/water (25/75, v/v) as a mobile phase. The method was applied to the analysis of putrescine and the total amount of spermine and spermidine in apple leaves and strawberry fruit. The results indicated that the method is practical and useful.     

圆形孔洞下应力集中的实验研究

本文运用材料力学、弹性力学的基本原理和电测法，通过测量有圆形孔洞板圆孔周围的应力，分析圆孔周围应力集中规律：通过单纯受拉或纯弯时的情况分析、讨论叠加原理在处理应力集中问题时的具体应用方法。     

Facile di-color emission tuning of poly[1-(4-vinylstyryl)naphthalene] with naphthalimide end group via ATRP

A series of fluorescent polymers with tunable di-color emission, P(NVS)_n-NAPHs, were prepared via well-controlled atom transfer radical polymerization (ATRP). Each of the obtained polymers with different molecular weights has a composite emission spectrum comprising a blue component originated from the monomer, 1-(4-vinylstyryl)naphthalene (NVS), and a green component originated from the initiator, 2-(2,3-dihydro-2-(4-methoxyphenyl)-1,3-dioxo-1H-phenalen-7-ylamino)-ethyl-2-chloroacetate (NAPH). The intensity of the blue and green emission bands can be easily tuned by changing the polymer chain length. The blue emission part is enhanced with increasing the molecular weight of the fluorescent polymer in both DMF solution and film state.     

Determination of90Sr in environmental samples with resonance ionization spectroscopy in collinear geometry

A new, fast technique for trace analysis of the radioactive isotopes⁸⁹Sr and⁹⁰Sr in environmental samples has been developed. Conventional mass separation is combined with resonance ionization spectroscopy in collinear geometry, which provides high selectivity and sensitivity. In addition, a chemical separation procedure for sample preparation has been developed. The described technique was used to determine the⁹⁰Sr content in 870 m³ air samples collected near Munich during and shortly after the Chernobyl reactor accident in April 1986. The content of⁹⁰Sr was measured to be 1.4 mBq per m³, corresponding to 1.6 × 10⁹ atoms of⁹⁰Sr per sample. This value is in good agreement with the results of radiochemical measurements.This publication comprises part of the Dissertations of J. Stenner and K. Zimmer     

激光对火焰的诊断 Ⅰ. 激光诱导荧光法对火焰温度分布的测量

用激光诱导荧光法对锥形液化石油气/空气火焰中的OH(X ~2n)基的转动温度分布进行测量, 获得了在火焰纵断面上的二维等温图。     

氧在镧钼阴极中的作用

利用脉冲激光沉积在不同真空度下制备了不同La／O的La-Mo薄膜阴极，测量其发射性能并进行了原位AES分析，讨论了氧在镧钼阴极热电子发射中的作用。过多的氧易形成稳定的氧化镧，不利于电子发射；适当比例的氧可以减缓镧的蒸发，有助于阴极的稳定工作。La-O化合物中氧空位的形成有利于阴极的电子发射，氧缺位增强了镧氧化合物的半导体性。     

Investigation of thermal stability and spectroscopic properties in Er3+/Yb3+-codoped TeO2-Li2O-B2O3-GeO2 glasses

The new Er3+/Yb3+ co-doped 70TeO2-5Li2O-(25-x)B2O3-xGeO2 (x = 0, 5, 10, 15 fand 20 mol.%) glasses were prepared. The thermal stability, absorption spectra, emission spectra and lifetime of the 4I(13/2) level of Er3+ ions were measured and studied. The FT-IR spectra were carried out in order to investigate the structure of local arrangements in glasses. It is found that the thermal stability, absorption cross-section of Yb3+, emission intensity and lifetime of the 4I(13/2) level of Er3+ increase with increasing GeO2 content in the glass composition, while the fluorescence width at half maximum (FWHM) at 1.5 um of Er3+ is about 70 nm. The obtained data suggest that this system glass can be used as a candidate host material for potential broadband optical amplifiers.