基于高分辨质谱在线观测的2011深圳大运会前后PM_1化学组成与粒径分布

本文利用先进的高分辨飞行时间气溶胶质谱仪（HR-ToF-AMS）于2011年深圳世界大学生运动会前后（2011年8月3日~9月22日）对深圳市区大气亚微米细粒子（PM1）化学成分和粒径分布进行了在线测量.结果表明,整个观测期间PM1质量浓度平均为51.1±32.6gm3,其中有机物占颗粒物总质量的37.9%,硫酸盐为37.1%,铵盐11.9%,黑碳6.6%（由一台单颗粒黑碳光度计（SP2）单独测量）,硝酸盐5.8%,氯化物0.6%.观测期间各成分（除黑碳外）的粒径分布峰值位于真空动力学粒径550nm附近,而有机物在较小粒径范围（100~200nm）仍有较多质量分布,显示出本地一次源的明显贡献.基于高分辨有机质谱计算得到的有机气溶胶的平均元素组成为：碳34.0%、氢53.2%、氧12.0%和氮0.8%（原子个数百分比）,对应的OM/OC（有机物与有机碳质量比）平均值为1.66±0.16.采用正矩阵因子解析（PMF）模型对有机气溶胶高分辨质谱进行因子解析,得到三类有机气溶胶：HOA（还原态有机气溶胶）,SV-OOA（半挥发氧化态有机气溶胶）和LV-OOA（低挥发氧化态有机气溶胶）,分别占有机物总量的31.3%,39.8%和28.9%,说明二次有机气溶胶（以SV-OOA和LV-OOA之和代表）是有机气溶胶的主体部分.结合气团来源分析不同时段PM1化学组成和粒径分布特征表明,大运会召开期间PM1质量浓度水平比整个观测期间的平均值低60.7%,是气团来自洋面等有利气象条件和黄标车限行等污染源控制措施的综合作用结果.     

Theoretical study of the charge carrier mobilities of the molecular materials tetrathiafulvalene (TTF) and 2,5-bis(1,3-dithiolan-2-ylidene)-1,3,4,6-tetrathiapentalene (BDH-TTP)

Tetrathiafulvalene (TTF) is a kind of fused ring aromatic compound containing four sulfur atoms in one molecule, which is well known as a charge transport material. In order to calculate the charge mobility of this semiconductor, Marcus electron transfer theory and the embedded model, which can give small intramolecular reorganization energies, were employed. The calculated results were in good agreement with the experimental values, so the above computing model is appropriate to assess the electrical property of TTF. On this basis, we predicted the charge mobility of 2,5-bis(1,3-dithiolan-2-ylidene)-1,3,4,6-tetrathiapentalene (BDH-TTP) crystals, for which the molecular structure is similar to TTF. The calculated results indicated that BDH-TTP is a p-type material, which has a better performance than TTF in hole transfer due to larger hole coupling and the smaller hole injection barrier. In addition, the direct coupling (DC) and the site energy correction (SEC) methods were used to calculate the charge transfer integrals. Although the results were slightly different, the qualitative trends were the same. Furthermore we took into account the anisotropic transfer properties of TTF and BDH-TTF, since obviously the mobilities along one dimension are larger than those along three dimensions. Finally, natural bond orbital analysis was used to study the interactions in all of the dimers.     

Optical observations of Scorpius X-1 in 2008: Evidence of rapid variability

Optical observations of Sco X-1 with exposure times around 0.5 s were performed with the 1.56 m telescope of the Shanghai Astronomical Observatory in 2008. With these observations, we studied the fluctuation of the optical flux on three short timescales (5, 10, 100 s). We found that the standard deviations of fluctuations on these three timescales differ from those of Gaussian distributions by 7 Sigma, 5 Sigma and 3 Sigma, respectively. The result suggests that the variations in the intensity on these short timescales differ from pure statistical fluctuations, which, we suggest, is due to the intrinsic variability in the optical emission.

     

Structural studies of dicycloplatin, an antitumor supramolecule

The solubility and stability of platinum-based anticancer agents have a direct bearing on their activity and toxicity. Much research has been conducted over the past decades in order to prepare drugs such as cisplatin and carboplatin with improved efficacy and reduced toxicity. Based on the premise that supramolecular platinum agents may have superior physicochemical properties, we successfully designed a novel anticancer agent, dicycloplatin, which has proven to be active against a number of human malignancies. The crystal structure of dicycloplatin has been determined. An aqueous solution of dicycloplatin was also studied using electrospray ionization mass spectrometry (ESI-MS). Based on the experimental observations, a model of the structure in aqueous solution is proposed which explains both the higher solubility and higher stability of dicycloplatin compared with carboplatin.     

Feasibility analysis of radiation balanced laser

An end-pumped slab laser model is analyzed to evaluate the feasibility of radiation balanced laser (RBL) when the laser crystal is chosen to be Yb:KGW. The ratio between fluorescence and stimulated photon number is first introduced to help estimate the output power of RBL. Through the analysis it turned out to be difficult to build high power RBL, but the idea of radiation balance can be used to reduce the waste heat for all laser design.     

Epitaxial thin film of SmFeO3 ferroelectric heterostructures

Epitaxial growth of SmFeO3/SrRuO3 was achieved on SrTiO3 substrates by the pulsed laser deposition(PLD)method at 973 K under oxygen partial pressure of 12.5 Pa.No Fe2+leakage was detected in our SmFeO3 film.The remanent polarization and coercive electric field of the thin film with a higher degree of orientation along(110)were 1.97μC/cm2 and 0.89×104 V/cm at room temperature,respectively.This film showed enhanced canted antiferromagnetism spin ordering compared with its corresponding powder materials.     

聚合离子液体-碳纳米管复合物在线固相萃取分离白蛋白

合成了聚（1-乙烯-3-乙基咪唑溴代盐）（poly（ViEtIm＋Br-））聚合离子液体,并通过π-π堆积将其固载到多壁碳纳米管上,得到了聚离子液体-碳纳米管复合物.以15mg复合物的填充柱为固相吸附剂,在顺序注射系统中研究了其对白蛋白的在线固相萃取分离纯化.在pH5.2时,对2mL溶液中（50μgmL-1）白蛋白的吸附效率为91%.0.04molL^-1柠檬酸盐缓冲溶液可定量洗脱吸附的白蛋白.整个分离纯化过程耗时500s,富集倍数为5.用该法对人全血中的白蛋白进行分离纯化,经SDS-PAGE凝胶电泳验证,得到了纯度较好的白蛋白.     

Calculation of Vibrational Energy-Spectra of α-Helical Protein Molecules and Its Properties

The quantum vibrational energy-spectra of amide-Is in alpha-protein molecules are calculated by using the discretely nonlinear Schrodinger equation and physical parameters appropriate to the systems on the basis of theory of bio-energy transport. The numerical results for the energy-spectra are basically consistent with the experimental values obtained by the infrared absorption and Raman scattering and emission-spectra of infrared lights of person's hand-fingers. Utilizing the energy-spectra we explain the laser-Raman spectrum from metabolically active E. Coli. and give some features of the infrared absorption of the protein molecules.     

Partition of arbitrary single-qubit information among n recipients via asymmetric (n+1)-qubit W state

A symmetric and(n,n)-threshold scheme for a sender to partition his/her arbitrary single-qubit information among n recipients is proposed by using a newly constructed asymmetric(n + 1)-qubit W state.Both the scheme in some given scenarios and the new W state are also discussed given.     

On regularizing-rate estimates for solutions to the heat flow with initial value problem

For a compact Riemannian manifold NRK without boundary, we establish the existence of strong solutions to the heat flow for harmonic maps from Rn to N, and the regularizing rate estimate of the strong solutions. Moreover, we obtain the analyticity in spatial variables of the solutions. The uniqueness of the mild solutions in C([0,T]; W1,n) is also considered in this paper.