核内部分子的统计模型、EMC效应和实光子产生

利用统计模型和重标度方案选取核内参数，使其符合小Ｘ和中Ｘ区域的实验参数，研究了ＥＭＣ效应对大Ｐ＿Ｔ实光子产生过程的影响．结果表明ＥＭＣ效应的影响是小的．

混合重标度模型、实光子产生和核Drell－Yan过程

利用混合重标度模型，解释ＥｕｒｏｐｅａｎＭｕｏｎＣｏｌｌａｂｏｒａｔｉｏｎ（ＥＭＣ）效应的主要特征．计算了大Ｐｒ实光子产生的截面比．讨论了核Ｄｒｅｌｌ－Ｙａｎ过程．

超高精度实验证实光子是玻色子

美国的物理学家对现代物理学的基石——两种基本粒子（玻色子和费米子）遵从两种截然不同的统计行为这一原理,进行了一项极精确的检验.利用激光的实验证实光子遵从玻色-爱因斯坦统计.与以前的实验相比,这一结果使光子实际上是费米子的可能性减少了1000倍.

利用虚光子和康普顿散射对同步辐射的分析

从虚光子的康普顿散射出发,给出了一种对同步辐射进行解释的新理论。当带电粒子在加速器中做圆周运动时,加速器的磁场可以看作周期静磁场,可以等效为虚光子。当该虚光子与加速器中运动的带电粒子发生康普顿散射时,就会转换为实光子辐射出去。给出了同步辐射实光子的波长的计算公式,并从合肥国家同步实验室和北京同步辐射装置的峰值特征波长以及斯坦福直线加速器中心的Ec/E3e 值、强磁场中子星极区的同步辐射等方面验证了该公式的正确性。

其它

O572.31 96042107关于光子学的若干情况=Some circumstances ofphotonics[刊,中]/殷一贤(重庆大学.四川,重庆(630044))∥激光杂志.—1996,17(2).—49—52论述了光子学的若干情况。

Experimental investigation of hollow-core photonic crystal fibers with five photonic band-gaps

The hollow-core photonic crystal fibers （HC-PCFs） with integrity structure have been fabricated with an improved twice stack-and-draw technique. The transmission spectrum shows that five photonic band-gaps within 450-1100 nm have been obtained.And the green fight transmission in the HC-PCFs has been observed remarkably.

Generation of Four-Mode Cluster-Type Entangled Coherent States in Free-Traveling Optical Fields

In this paper, we propose an optical scheme to generate four-mode cluster-type entangled coherent states （ECSs） in free traveling optical fields by using two single-photon sources, coherent state sources, beam splitters, pho- todetectors, cross-Kerr media, and phase shifters. And the success probability of the states preparation is calculated. At last we discuss the experimental feasibility of such proposal.

Linear Optical Scheme for Implementing Optimal Real State Cloning

We propose an experimental scheme for implementing the optimal 1 → 3 real state cloning via linear optical elements. This method relies on one polarized qubit and two location qubits and is feasible with current experimental technology.

STUDY ON THE ADSORPTION BEHAVIOR OF Pb(Ⅱ) ON NANOMETER ATTAPULGITE BY FAAS

The adsorptive behavior of nanometer attapulgite modified by acid to Pb（Ⅱ） was investigated by flame atomic absorption spectrometry （FAAS） in this paper. The mainly effect parameters ott the adsorptive efficiency of Pb（Ⅱ）, such as the acidity of the solution, the amount of attapulgite, oscillation time and static time were studied. Also the influencing factors of the recovery efficiency of Pb（Ⅱ）, including the concentration of hydrochloric acid, the volume of hydrochloric acid, oscillation time and static time were investigated. The adsorptive capacity of Pb（Ⅱ） on nanometer attapulgite was 26.5mg/g and the adsorptive capacity of first cycle and second cycle regenerated nanometer attapulgite were 26.5mg/g and 26.3mg/g, respectively. The results obtained indicated that the regenerated effect was good.

Ab initio Study on Ionization Energies of 1-Methyl-hypoxanthine

Six low-lying tautomers of 1-methyl-hypoxanthine have been studied at the B3LYP/aug-cc- pVDZ level. Two tautomers NTH and N9H with the comparable energies are far more stable than the others. The vertical ionization energies of the tautomers calculated with ab initio electron propagator theory in the P3/aug-cc-pVDZ approximation are in agreement with the experimental data from photoelectron spectroscopy. According to the calculated relative energies and the comparison between the simulated and the experimental photoelectron spectra, it demonstrates that there are at least two tautomers of 1-methyl-hypoxanthine in the gas-phase experiments.

The difference between multi-drug resistant cell line A549/Gem and its parental cell A549

Objective:To discuss the difference between multi-drug resistant cell line A549/Gem and its parental cell A549 on the basis of establishment of human gemcitabine-resistant cell line A549/Gem so as to elaborate the possible mechanisms of gemcitabine resistance.Methods:Human gemcitabine-resistant non-small cell lung cancer cell line A549/Gem was estab-lished by the method of repeated clinical serous peak concentration plus gradually increasing concentration of gemcitabine from its parental cell human lung adenocarcinoma cell line A549 which was sensitive to gemcitabine.During the course of inducement,we had monitored their morphology,checked their resistance indexes and resistant pedigree by MTT method,gathered their growth curves and calculated their doubling time,examined their DNA contents and cell cycles by FCM;at the same time,we had measured their expressions of P53,EGFR,Cerb-B-2,PTEN,PCNA,c-myc,VEGF,MDR-1,Bcl-2,nm23,MMP-9,TIMP-1,and CD44v6 proteins via immunocytochemistry staining,RRM1 and ERCC1 mRNA by real-time fluorescent quantitative-PCR.Results:The resistance index of A549/Gem' cells(the deputy of cells in the process of inducement) to gemcitabine was 163.228,and the cell line also exhibited cross-resistance to vinorelbine,taxotere,fluorouraci,etoposide and cisplatin,but kept sensitivity to paclitaxol and oxaliplatin.The doubling time of A549/Gem' was shorter and figures in G0-G1 phases were increased than A549 cells.Compared with A549 cells,A549/Gem' cells achieved EGFR and c-myc proteins expressions,nm23 protein expression enhanced,P53,Cerb-B-2 and Bcl-2 proteins expressions reduced,PTEN,PCNA and MDR-1 proteins expressions vanished,but those of MMP-9,VEGF,CD44v6 and TIMP-1 proteins changed trivially.Meanwhile,expressions of RRM1 and ERCC1 mRNA were augmented markedly.The resistance index of A549/Gem cells to gemcitabine was 129.783,and the cell line also held cross-resistance to vinorelbine,taxotere,etoposide,cisplatin and sensitivity to paclitaxol.But the resistance to fluorouracil and sensitivity to oxaliplatin vanished.And the expression of RRM1 and ERCC1 mRNA decreased visibly.The doubling time of A549/Gem cells was longer and figures in G0-G1 phases were decreased than A549/Gem' cells.In A549/Gem cells,expressions of P53,EGFR,PCNA and MDR-1 proteins was same to those of A549/Gem' cells.A549/Gem cells achieved TIMP-1 and PTEN proteins expressions,Cerb-B-2,MMP-9,c-myc and Bcl-2 proteins expressions enhanced,nm23 protein expressions vanished,but the expressions of VEGF and CD44v6 proteins changed trivially.Furthermore,Compared with its parental cell A549,A549/Gem cell was mixed with giant cells of different sizes and was larger and more irregular.Conclusion:The human gemcitabine-resistant non-small cell lung cancer cell line A549/Gem had achieved multi-drug resistance and great changes of biological characters compared with its parental cells A549.And these changes possibly participated in the formation of multidrug resistance.

Photoproduction of Vector Meson φ off Deuteron in QCD Inspired Model

Based on the quark-gluon contents of nucleon and strongly believing that the force mediators,Pomeronand its counterpart in the conventional approach of Regge theory,for high energy diffractive process would be the tensorglueball and Odderon respectively,we discuss photo-production of vector meson φ off the deuteron at energy less than 3GeV in the QCD inspired model in which the quark gluon degrees of freedom and glueball,Odderon exchange are takeninto account.A calculation is performed for γ + D →φ + D,and the theoretical predictions of the differential crosssection dσ^(γD)) /dt,are presented and compared with available experimental data.Our QCD inspired model reproducesdata quite well in the whole range of the experimental measurements up to |t| ■0.4 GeV.Our results can be used toextract γn→φn data,which cannot be measured in experiment.

Induction of Internal Capacitance Effect in Performance Measurement of OPV （Organic Photovoltaic） Device by RTOSM （Real-Time One-Sweep Method）

The advantages of OPV （organic photovoltaic） are low cost, little pollution and flexible. But challenge for OPV manufacture still is lacking of accurately performance measurement due to capacitance issue. Firstly, characterization of OPV requires considering the slowly temporal response due to capacitance effect, and the relative I-V （current-voltage） curves are strongly dependent on the voltage sweep direction, even for the sweep time only in few seconds or less. Secondly, the IPCE （incident photon-to-electron conversion efficiency） also shows the slowly temporal response due to capacitance effect and is dependent on the wavelength of the incident light. Furthermore, the related features for measuring I-V curves are more sensitive with temperature due to non-linear characteristics issue, but current IPCE spectra of OPV are similar to that happened in conventional crystalline Si or amorphous silicon devices. In this work, we developed a RTOSM （real-time one-sweep method） applied both in I-V and IPCE to analysis different electronic transport materials, and result showed this new approach proposed a good way to slow down testing time and having better accuracy for OPV measurement by eliminating acceptance effect instantly.

The Optical Emission Spectroscopy Experiment of Open Air Plasmas

A plasma spectroscopy experiment is described and its performances are given, ways oI excltauon u^ttc~,t tc~,,,,,~ ,,, free-burning plasma at atmospheric pressure is analyzed in detail. The fixed-grating spectrograph PGS-2 Carl Zeiss Jena is actually a variation on the very first spectrometer design, where photo-plate was replaced with a detector array of PIXIS-Roper Scientific camera. Abilities of the system are analyzed and its limitations are determined.

Construction of an operando dual-beam fourier transform infrared spectrometer and its application in the observation of isobutene reactions over nano-sized HZSM-5 zeolite

An operando dual‐beam Fourier transform infrared (DB‐FTIR) spectrometer was successfully developed using a facile method. The DB‐FTIR spectrometer is suitable for the real‐time study of the dynamic surface processes involved in gas/solid heterogeneous catalysis under real reaction conditionsbecause it can simultaneously collect reference and sample spectra. The influence of gas‐phasemolecular vibration and heat irradiation at real reaction temperatures can therefore be eliminated.The DB‐FTIR spectrometer was successfully used to follow the transformation of isobutene over nano‐sized HZSM‐5 zeolite under real reaction conditions.

Investigation on adsorption and regeneration performances of multi-walled carbon nanotubes by supercritical water technique

In this paper, adsorption and regeneration characteristics of multi-walled carbon nanotubes （MWNTs） used as adsorbent were investigated for the removal of 1,3-beuzenediol （BDO） from water by the supercritieal water （SCW） technique. FFIR, XPS, SEM and dispersion stability tests were used to characterize the structure and surface morphology of CNTs. The results showed that CNTs surfaces were slightly activated and strongly etched in supercritieal water system. The adsorption capacity of SCW-treated CNTs was higher than that of raw CNTs. The adsorbed amounts for treated CNTs and raw CNTs samples at the same initial concentration of 60 mg/L were ca. 16.42 and 7.30 mg/g, respectively. The BDO adsorption of treated CNTs was due to the physical adsorption. The experimental data fit Freundlich isotherm model better than Langmuir one. The loaded adsorbent could be efficiently desorbed and regenerated by SCW technique. Therefore, SCW is a promising and environmentally friendly technique for the improvement of adsorption and regeneration of CNTs.

Triangular Halogen Bond and Hydrogen Bond Supramolecular Complex Consisting of Carbon Tetrabromide, Halide, and Solvent Molecule： A Theoretical and Spectroscopic Study

The theoretical calculation and spectroscopic experiments indicate a kind of triangular three bonding supramolecular complexes CBr4…X^-…-H-C, which consist of carbon tetrabromide, halide, and protic solvent molecule （referring to dichloromethane, chloroform and acetonitrile）, can be formed in solution. The strength of halogen and hydrogen bonds in the triangular complexes using halide as common acceptor obeys the order of iodide〉bromide〉chloride. The halogen and hydrogen bonds work weak-cooperatively. Charge transfer bands of halogen bonding complexes between CBra and halide are observed in UV-Vis absorption spectroscopy in three solvents, and then the stoichiometry of 1：1, formation constants K and molar extinction coefficients ε of the halogen bonding complexes are obtained by Benesi-Hildebrand method. The K and ε show a dependence on the solvent dielectric constant and, on the whole, obey an order of iodide〉bromide〉chloride in the same solvents. Furthermore, the C-H vibrational frequencies of solvent molecules vary obviously with the addition of halide, which indicates the C-H…X- interaction. The experimental data indicate that the halogen bond and hydrogen bond coexist by sharing a common halide acceptor as predicted by calculation.

On Some Regularities of One-seeded Fruits Evolution

Anatomical structure of differently originated seed envelopes in one-seeded indehiscent fruits of Urticaceae and Asteraceae members is studied using light and scanning electron microscopes. It was found that in anthocarps and involucrate fruits of both families the relations between the primary （pericarp） and secondary fruit envelopes （perianth and/or involucre） were composed under complexification （union） type, and not as substitution. Numerous examples of non-homologous resemblance in fruit envelope structure indicate a high degree of adaptability of certain histological types, recurring on a different morphological basis in different phyletic lines within a family. These tissue complexes represent widely occurring types of the pericarp （Utricaceae） or pericarp and seed coat tissue union （Asteraceae）. This evolutionary repetition or pseudocyclic resemblance is apparently another common regularity of one-seeded indehiscent fruits evolution in addition to those enumerated in general by Zohary （1950）.

High tap density of Ni_3(PO_4)_2 coated LiNi_(1/3)Co_(1/3)Mn_(1/3)O_2 with enhanced cycling performance at high cut-off voltage

The Li Ni1/3Co1/3Mn1/3O2 is first obtained by the controlled crystallization method and then coated with Ni3(PO4)2particles. The effects of the coating on rate capability and cycle life at high cut-off voltage are investigated by electrochemical impedance spectroscopy and galvanostatic measurements. The element ratio of Ni:Mn:Co is tested by inductively-coupled plasma spectrometer(ICP) analysis and it testified to be 1:1:1. It is indicated that Ni3(PO4)2-coated Li Ni1/3Co1/3Mn1/3O2 has an outstanding capacity retention, where 99% capacity retention is maintained after 10 cycles at 5C discharge rate between 2.7 V and 4.6 V. The electrochemical impedance spectroscopy(EIS) results show that the current exchange density i0 of the coated sample is higher than that of Li Ni1/3Co1/3Mn1/3O2, which is beneficial to its electrochemical performances. All the conclusions show that the Ni3(PO4)2coating can prominently enhance the high rate performance of the Li Ni1/3Co1/3Mn1/3O2, especially at high cut-off voltage.

The Usage of Saccharomyces cerevisiae in Microbial Fuel Cell System for Electricity Energy Production

A laboratory-scale MFC （microbial fuel cell） was studied in order to determine the capacity and the efficiency of electricity production in microbial fuel cell system by using microorganisms. The medium used is an isolated culture ofSaccharomces cereviciae. A number of media has been evaluated to provide the best growth phase for Saccharomces cereviciae using optical density method with spectrophotometer at a wavelength of 550 nm. Nation 117, Lyntech, USA is used as proton exchange membrane and graphites with surface area 1.46 x 10.3 m2 are used as cathodes. Cathode chamber is fulfilled with a mixture of electrolyte compounds K3Fe（CN）6 and a buffer solution. Microbes that have been cultured are applied into anode chamber. A number of factors need to be controlled so that microbes can generate electrical energy efficiently, such as by measuring the degree of acidity and DO value in the anode compartment. In this research, the usage of riboflavin as a mediator is also investigated, while the usage of riboflavin increase production efficiency 53.90% compare to MFC without riboflavin as a mediator.