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Low-Energy Electron Scattering by CS2 Molecules CS2分子的低能电子散射
Australian Journal of Physics Pub Date : 2000-12-15 DOI: 10.1071/PH00083
M. Bettega
{"title":"Low-Energy Electron Scattering by CS2 Molecules","authors":"M. Bettega","doi":"10.1071/PH00083","DOIUrl":"https://doi.org/10.1071/PH00083","url":null,"abstract":"We report the integral elastic cross section for low-energy electron scattering by CS2 molecules. To perform our calculations we used the Schwinger multichannel method with pseudopotentials.We have found, in a static-exchange calculation, a shape resonance around 1 eV that belongs to the Π u symmetry.With the inclusion of polarisation effects only in that symmetry, we show that the resonance becomes a bound state. This result is in agreement with other results available in the literature.","PeriodicalId":170873,"journal":{"name":"Australian Journal of Physics","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132196898","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
The Didjeridu: Lip Motion and Low Frequency Harmonic Generation Didjeridu:唇部运动与低频谐波的产生
Australian Journal of Physics Pub Date : 2000-12-15 DOI: 10.1071/PH00100
L. Hollenberg
{"title":"The Didjeridu: Lip Motion and Low Frequency Harmonic Generation","authors":"L. Hollenberg","doi":"10.1071/PH00100","DOIUrl":"https://doi.org/10.1071/PH00100","url":null,"abstract":"The dynamic acoustics of the Australian didjeridu are studied by separately considering transverse and longitudinal lip vibration models in the context of highly non-sinusoidal lip motion. Timedomain computer simulations are performed based on these lip models coupled to the input impedance function of a straight pipe. For the purposes of direct comparison, detailed results are reported here for lip motion leading to both sinusoidal lip opening area functions (characteristic of higher frequency brass instruments) and the more complex non-sinusoidal (approximately half-closed cycle) case characteristic of the didjeridu. Over a range of lip resonance frequencies, the sounding frequency for the transverse (longitudinal) model is found to be below (above) both the lip and fundamental pipe resonance frequencies, in qualitative agreement with linear theory for these value types. A striking difference is found between the two models when comparing the effect of significant lip closure in the non-sinusoidal cycle—the sounding frequency in the transverse case is raised by up to 10%, whilst essentially unaltered in the longitudinal model. The effect the lips sticking during the non-sinusoidal cycle was considered by increasing the damping force upon closure, and was found in both transverse and longitudinal models to weaken significantly the generation of harmonics in the sound.","PeriodicalId":170873,"journal":{"name":"Australian Journal of Physics","volume":"98 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132130811","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 8
Preparation of Motion Entangled Coherent States of Two Cavity Mirrors 两腔镜运动纠缠相干态的制备
Australian Journal of Physics Pub Date : 2000-12-15 DOI: 10.1071/PH00017
Shi-Biao Zheng
{"title":"Preparation of Motion Entangled Coherent States of Two Cavity Mirrors","authors":"Shi-Biao Zheng","doi":"10.1071/PH00017","DOIUrl":"https://doi.org/10.1071/PH00017","url":null,"abstract":"A scheme is proposed for the generation of entangled coherent states of two spatially separated cavity mirrors. In the scheme, a two-level atom is sent through two cavities, each having a movable mirror, to produce an entangled photon state for the cavity fields. Then the optomechanical effects further entangle the mirror motions with the cavity fields. A second two-level atom, passing through the cavities, is state-selectively measured, which reduces the mirror motions to an entangled coherent state.We also show how to distinguish such an entangled state from a classical mixture.","PeriodicalId":170873,"journal":{"name":"Australian Journal of Physics","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133729108","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Generation of Multicavity Entangled States with a Single Three-Level Atom 用单个三能级原子产生多腔纠缠态
Australian Journal of Physics Pub Date : 2000-12-15 DOI: 10.1071/PH00065
Shi-Biao Zheng
{"title":"Generation of Multicavity Entangled States with a Single Three-Level Atom","authors":"Shi-Biao Zheng","doi":"10.1071/PH00065","DOIUrl":"https://doi.org/10.1071/PH00065","url":null,"abstract":"A simple scheme is proposed for the generation of maximally entangled states for several separated cavities, in which each cavity is in a one-photon state or in the vacuum state. In the scheme a laddertype three-level atom is sent through the cavities and additional classical fields. The whole system finally evolves into a state, which is given by the product of the highly entangled field state with an atomic state.","PeriodicalId":170873,"journal":{"name":"Australian Journal of Physics","volume":"111 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132324937","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Microscopic Model Analyses of the Elastic Scattering of 25, 30 and 40 MeV Protons from Targets of Diverse Mass 不同质量靶25mev、30mev和40mev质子弹性散射的微观模型分析
Australian Journal of Physics Pub Date : 2000-12-15 DOI: 10.1071/PH00063
P. Deb, K. Amos, S. Karataglidis
{"title":"Microscopic Model Analyses of the Elastic Scattering of 25, 30 and 40 MeV Protons from Targets of Diverse Mass","authors":"P. Deb, K. Amos, S. Karataglidis","doi":"10.1071/PH00063","DOIUrl":"https://doi.org/10.1071/PH00063","url":null,"abstract":"An extensive survey and analysis of cross-section and analysing power data from proton elastic scattering at energies 25 to 40 MeV is presented. The data are compared with predictions obtained from a full folding specification of the proton–nucleus optical potentials. Isotope and energy variation of the data is explained.","PeriodicalId":170873,"journal":{"name":"Australian Journal of Physics","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124373321","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Acoustic Vibrational Properties and Fractal Bond Connectivity of Praseodymium Doped Glasses 掺镨玻璃的声振动特性和分形键连通性
Australian Journal of Physics Pub Date : 2000-12-15 DOI: 10.1071/PH00066
H. Senin, H. Sidek, G. Saunders
{"title":"Acoustic Vibrational Properties and Fractal Bond Connectivity of Praseodymium Doped Glasses","authors":"H. Senin, H. Sidek, G. Saunders","doi":"10.1071/PH00066","DOIUrl":"https://doi.org/10.1071/PH00066","url":null,"abstract":"The velocities of longitudinal and shear ultrasonic waves propagated in the (Pr2O3)x(P2O5)1-x glass system, where x is the mole fraction of Pr2O3 and (1 - x) is the mole fraction of P2O5, have been measured as functions of temperature and hydrostatic pressure. The temperature dependencies of the second order elastic stiffness tensor components (SOEC) CS IJ , which have been determined from the velocitydata between 10 and 300 K, show no evidence of phonon mode softening throughout the whole temperature range. The elastic stiffnesses increased monotonically, the usual behaviour associated with the effect of the phonon anharmonicityof atomic vibration. At low temperatures, strong phonon interactions with two-level systems have been observed. The ultrasonic wave attenuation of longitudinal and shear waves is dominated bya broad acoustic loss peak whose height and peak position are frequencydependent. This behaviour is consistent with the presence of thermally activated structural relaxation of the two-level systems in these glasses. The fractal bond connectivity of these glasses, obtained from the elastic stiffnesses determined from ultrasonic wave velocities, has a value between 2.32 to 2.55, indicating that their connectivitytends towards having a threedimensional character. The hydrostatic pressure dependencies of longitudinal ultrasonic waves show a slight increase with pressure. As a consequence, the hydrostatic pressure derivatives ( CS11/ P)P=0 of the elastic stiffness CS11/ and (BS/P)P=0 of the bulk modulus BS of (Pr2O3)x(P2O5)1-x glasses are positive. The bulk modulus increases with pressure, and thus these glasses stiffen under pressure, which is associated with the normal elastic behaviour. The GrUneisen parameter approach has been used to quantifythe vibrational anharmonicityof the long-wavelength acoustic phonons in these glasses.","PeriodicalId":170873,"journal":{"name":"Australian Journal of Physics","volume":"51 3S 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122823037","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Neutral Currents in the 16O Nucleus 16O核中的中性电流
Australian Journal of Physics Pub Date : 2000-12-15 DOI: 10.1071/PH00039
D. Mihailescu, D. Radu, O. Dumitrescu
{"title":"Neutral Currents in the 16O Nucleus","authors":"D. Mihailescu, D. Radu, O. Dumitrescu","doi":"10.1071/PH00039","DOIUrl":"https://doi.org/10.1071/PH00039","url":null,"abstract":"The aim of this paper is to investigate the parity and isospin forbidden a0 decay from 16O (Jp = 1+; T = 1;Ex = 16.209MeV) to 12C(g.s.) by calculating the longitudinal AL and the irregular transverse Ab analysing powers of the reaction 15N( p, α0)12C around the 1+, Ex = 16.2MeV resonance in 16O. The range for the expected interference effect has been estimated to be AL 3.2 ×10-5 and Ab 2.3 × 10-5.","PeriodicalId":170873,"journal":{"name":"Australian Journal of Physics","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125936660","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Real Critical Current Density and Material Power Law of YBa2Cu3O7-d Epitaxial Thin Film YBa2Cu3O7-d外延薄膜的实临界电流密度和材料幂律
Australian Journal of Physics Pub Date : 2000-12-15 DOI: 10.1071/PH00081
L. Shan, S. Aruna, Xiaonong Xu, Z. Wang, X. Jin
{"title":"Real Critical Current Density and Material Power Law of YBa2Cu3O7-d Epitaxial Thin Film","authors":"L. Shan, S. Aruna, Xiaonong Xu, Z. Wang, X. Jin","doi":"10.1071/PH00081","DOIUrl":"https://doi.org/10.1071/PH00081","url":null,"abstract":"The current–voltage characteristics have been measured on aYBa2Cu3O7-δ epitaxial thin film. Using a material power law, we determine the temperature and field dependencies of the characteristic pinning potential UJand the real critical current density Jc at different fields and temperatures. It is shown that Jc is completely different from the conventional critical current density JE, which is determined by the electronic-field criterion. Thus, the time-honoured electronic-field criterion is no longer reasonable for high-Tc superconductors. By further investigation of the results of Jc and UJ, we are able to present a physical picture of the transformation of the pinning potential well with increasing temperature and hence determine the transition point from vortex-glass phase to vortex-liquid phase.","PeriodicalId":170873,"journal":{"name":"Australian Journal of Physics","volume":"2012 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128958953","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Positron Lifetimes and Microhardness in Thermal Fatigued 4Cr5MoSiV Steel 热疲劳4Cr5MoSiV钢的正电子寿命和显微硬度
Australian Journal of Physics Pub Date : 2000-12-15 DOI: 10.1071/PH00041
C. Q. Tang, Z. Xia, X. Z. Li, B. Yao
{"title":"Positron Lifetimes and Microhardness in Thermal Fatigued 4Cr5MoSiV Steel","authors":"C. Q. Tang, Z. Xia, X. Z. Li, B. Yao","doi":"10.1071/PH00041","DOIUrl":"https://doi.org/10.1071/PH00041","url":null,"abstract":"Positron lifetimes and microhardness have been measured as a function of the thermal fatigue cycle number N in 4Cr5MoSiV steel. It is found that with increasing N: (a) the positron lifetime parameters t1, t2, I1, I2 and ot and the microhardness parameter MH all exhibit quasi-periodic up-and-down variation; (b) these parameters have the same period of variation; and (c) the period of up-and-down variation becomes gradually longer. The variation of MH reveals that fatigue hardening and fatigue softening occur alternately in the process of thermal fatigue. The variations of positron lifetime parameters reveal variations of defects in the fatigued materials. These variations are attributed to microdeformation and dynamic recovery dominating alternately in the process of thermal fatigue.","PeriodicalId":170873,"journal":{"name":"Australian Journal of Physics","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133986805","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
On Nonleptonic Decays of Supermultiplets 关于超重态的非轻子衰变
Australian Journal of Physics Pub Date : 2000-10-16 DOI: 10.1063/1.1330928
R. Delbourgo, Dong-sheng Liu
{"title":"On Nonleptonic Decays of Supermultiplets","authors":"R. Delbourgo, Dong-sheng Liu","doi":"10.1063/1.1330928","DOIUrl":"https://doi.org/10.1063/1.1330928","url":null,"abstract":"By describing strong interactions between hadrons via a relativistic supermultiplet scheme and regarding weak interactions as a perturbation thereof, we derive expressions for nonleptonic weak decay amplitudes in terms of constituent quark masses and CKM angles, with no other parameters. Application of this method leads to ΔI = dominance in some pseudoscalar meson decays if one scales down the couplings of heavy particles by M mass factors, in keeping with heavy quark theory expectations. However, certain B and D decay processes to kaons are badly predicted and point to substantial soft gluon renormalisation effects inW-quark interactions.","PeriodicalId":170873,"journal":{"name":"Australian Journal of Physics","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122661103","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
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