共查询到20条相似文献，搜索用时 31 毫秒
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Augmented Reality consists of merging live images with virtual layers of information. The rapid growth in the popularity of smartphones and tablets over recent years has provided a large base of potential users of Augmented Reality technology, and virtual layers of information can now be attached to a wide variety of physical objects. In this article, we explore the potential of Augmented Reality for astrophysical research with two distinct experiments: (1) Augmented Posters and (2) Augmented Articles. We demonstrate that the emerging technology of Augmented Reality can already be used and implemented without expert knowledge using currently available apps. Our experiments highlight the potential of Augmented Reality to improve the communication of scientific results in the field of astrophysics. We also present feedback gathered from the Australian astrophysics community that reveals evidence of some interest in this technology by astronomers who experimented with Augmented Posters. In addition, we discuss possible future trends for Augmented Reality applications in astrophysics, and explore the current limitations associated with the technology. This Augmented Article, the first of its kind, is designed to allow the reader to directly experiment with this technology. 相似文献
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C. C. Kuranz R. P. Drake M. J. Grosskopf H. F. Robey B. A. Remington J. F. Hansen B. E. Blue J. Knauer 《Astrophysics and Space Science》2009,322(1-4):49-55
This paper discusses high-energy-density laboratory astrophysics experiments exploring the Rayleigh-Taylor instability under conditions similar to the blast wave driven, outermost layer in a core-collapse supernova. The planar blast wave is created in an experimental target using the Omega laser. The blast wave crosses an unstable interface with a seed perturbation machined onto it. The perturbation consists of a 3D “egg crate” pattern and, in some cases, an additional longer wavelength mode is added to this 3D, single-mode pattern. The main diagnostic of this experiment is x-ray radiography. This paper explores an image processing technique to improve the identification and characterization of structure in the radiographic data. 相似文献
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Applications of laser-created dense e<Superscript>+</Superscript>e<Superscript>−</Superscript> pairs
We review the recent developments of laser pair creation in the laboratory and their potential applications to astrophysics
and other frontiers. Many astrophysical phenomena involving e+e− plasmas may be systematically investigated in the laboratory setting. We also discuss potential applications of dense positronium
gas. 相似文献
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Kaushik Roy Prasanta Chatterjee S. S. Kausik C. S. Wong 《Astrophysics and Space Science》2014,350(2):599-605
The dust-acoustic shock waves have been theoretically investigated using reductive perturbation technique. An unmagnetized four-component dusty plasma system consisting of nonextensive q-distributed electrons, Boltzmann distributed ions, and negatively as well as positively charged dust particles has been considered. The solution of Burgers equation in planar geometry is numerically analyzed. It has been observed that the nonextensive q-distribution of electrons has a significant role in the formation of shock waves. The relevance of our results to astrophysics as well as laboratory plasmas are briefly discussed. 相似文献
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现代科学表明宇宙中99%以上的可观测物质都处于等离子体状态,从小尺度的微观粒子动力学集体过程与能量转换机制到大尺度的宇宙等离子天体结构状态与爆发活动现象,都是等离子天体物理学的研究课题.从宇宙演化历史、大尺度结构形成以及爆发活动现象等方面,系统地论述了等离子天体物理学在现代天文学发展以及现代等离子体宇宙观形成中的重要作用.同时,结合空间卫星科学探测研究及其对现代天文学的巨大影响,进一步阐述了地球磁层和日球层等空间等离子体实地探测研究在等离子天体物理学研究中所扮演的“天然实验室”的独特作用. 相似文献
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C. Michaut E. Falize C. Cavet S. Bouquet M. Koenig T. Vinci A. Reighard R. P. Drake 《Astrophysics and Space Science》2009,322(1-4):77-84
Radiative shocks (RS) occur in astrophysical systems and in high-energy density laboratory experiments. Aided by three dimensionless parameters, we propose a classification of RS into four types, integrating previous work that has focused independently on optical depth and on Mach number. Specific terms, such as a cooling function, a radiative flux, or radiative energy and pressure must be added to the Euler equations in order to model these various kinds of shocks. We examine how these terms correspond to the radiative classification regimes. In astrophysics, observed RS arise generally in optically thin material. Thus, radiation escapes without interaction with the surrounding gas, except perhaps to ionize it, and the energy loss in such shocks can be modeled by a cooling function Λ. In this case only the post-shock region is structured by the radiation cooling. We found the analytical solution for hydrodynamic equations including Λ∝ ρ ε P ζ x θ for arbitrary values of ε, ζ, θ. This is a completely new result. An application of this calculation for the accretion shock in cataclysmic variables of polar type is given in astrophysical terms. We also draw a parallel between RS experiments performed using the LULI2000 laser facility, in France and the Omega laser Facility, in USA. RS developed in these laboratories are more or less optically thick. These high-Mach number RS present a radiative precursor. 相似文献
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Shaukat Goderya 《Astrophysics and Space Science》2002,282(1):121-130
Astronomical research with a small telescope (20 cm – 40 cm) has always been a challenging problem. The invention of CCD cameras
and personal computers has now put this question to past as small telescopes can do good and practicle science. This paper
describes the use of small telescope in the study of eclipsing binary stars. Binary stars play an important role as astrophysical
laboratories in our quest to understand the evolution and structure of stars. The most useful aspects of research with a small
telescope in binary star research is; 1) as a viable teaching laboratory for begining students 2) to teach and learn the fundamental
observational techniques that are common to many types of astronomical research areas 3) as a starting point to initiate research
programs in observational astronomy, optics, instrumentation, computational astrophysics and 4) as a foundation to develop
an infrastructure and technical know how for larger telescope facility.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
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A. Pommerol N. Thomas M. Affolter G. Portyankina B. Jost K. Seiferlin K.-M. Aye 《Planetary and Space Science》2011,59(13):1601-1612
We have designed and constructed an original facility to characterize the VIS–NIR Bidirectional Reflectance Distribution Function (BRDF) and some complementary bulk physical properties of planetary analog samples containing water ice. The central part of the facility is a highly accurate gonio-radiometer (PHIRE-2) operating in the VIS–NIR spectral range (400–1100 nm) installed in a large laboratory freezer. Its development was based on the experience gained on the gonio-radiometer PHIRE-1 (Gunderson et al., 2006). The PHIRE-1 design was modified to permit operations at sub-zero temperatures and to optimize the performance of the instrument. The photometric measurements are complemented by a detailed simultaneous characterization of the physical state and possible temporal evolution of the samples using a combination of macro- and micro-imaging, thermal, electrical and sample mass measurements. The modified design will support the interpretation of current and future remote sensing and in-situ datasets on icy planetary objects with a special emphasis on cometary nuclei, Martian polar regions and Jovian satellites. 相似文献
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X. Ribeyre P. Nicolaï S. Galera V. T. Tikhonchuk 《Astrophysics and Space Science》2009,322(1-4):85-90
Supersonic plasma jets are ubiquitous in astrophysics. Our study focus on the jets emanated from Herbig-Haro (HH) objects. They have velocities of a few hundred km/s and are extending over the distances more than a parsec. Interaction of the jets with surrounding matter produces two specific structures in the jet head: the bow shock and the Mach disk. The radiative cooling of these shocks affects strongly the jet dynamics. A tool to understand the physics of these jets is the laboratory experiment. A supersonic jet interaction with surrounding plasma was studied on the PALS laser facility. A collimated high-Z plasma jet with a velocity exceeding 400 km/s was generated and propagated over a few millimeters length. Here we report on study the effect of radiative cooling on the head jet structure with a 2D radiative hydrodynamic code. The simulation results demonstrated the scalability of the experimental observations to the HH jets. 相似文献
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Niels Lund 《Experimental Astronomy》1992,2(5):259-273
A study is presented on the feasibility of using Bragg diffraction from crystals to focus soft gamma-rays in the energy range up to 2 MeV. For astrophysics this band contains several very interesting gamma-ray lines from novae, supernovae and X- and gamma-ray transients.The study concludes that, in the energy range between 300 and 1300 keV, a Bragg-telescope with a focal length of about 50 meters could achieve a sensitivity for point sources which is between 5 and 10 times better than that currently expected for the ESA/NASA INTEGRAL-mission/1/. In addition, the angular resolution of the Bragg telescope would also be an order of magnitude better. Despite the large physical dimensions of the telescope, its feasibility does not seem out of reach. The requirements do not go appreciably beyond those of other scientific projects which have been studied and found technically feasible by ESA and NASA /2, 3/. The Bragg-telescope therefore may become the logical next step in soft gamma-ray astronomy following a sensitive survey project like INTEGRAL. 相似文献
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简要介绍了计算机模拟的基本原理和方法 ,以及数值模拟计算在天体物理学中的主要应用结果和前景 相似文献
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��. Falize B. Loupias A. Ravasio C. D. Gregory A. Dizi��re M. Koenig C. Michaut C. Cavet P. Barroso J.-P. Leidinger X. Ribeyre J. Breil H. Takabe Y. Sakawa Y. Kuramitsu T. Morita N. C. Woolsey W. Nazarov S. Pikuz 《Astrophysics and Space Science》2011,336(1):81-85
In this paper, theoretical and experimental laboratory astrophysics results are presented from the POLAR project, the main focus of which is to design and diagnose an exact scaled accretion column using powerful lasers. These measurements allow the testing of the astrophysical models of accretion processes present in magnetic cataclysmic variables. 相似文献
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A convenient approach to model MHD steady axisymmetric outflows is the so-called self-similar technique wherein the physical
variables are factorized and a scaling law is assumed along one of the coordinates. This scaling depends on the astrophysical
process under investigation. In this note we summarize all possible self-similar MHD outflow solutions; furthermore, we briefly
discuss the main properties of a class of solutions which are self-similar in the meridional direction and allow to analyse
in simple terms the dynamical properties of an outflow close to its rotational axis. Special attention is focused on the asymptotic
structure of collimated winds. It will be shown that different regimes are possible for jets, in particular they can be either
thermally or magnetically confined, depending on the physical conditions of the flow. This analysis is complementary with
the well known radial self-similar models which are invoked to study winds from accretion disks.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
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The presentations made at the workshop “XMM‐Newton: The Next Decade”, held at ESAC from 4th to the 6th of July 2007, contained an overwhelming amount of new results and well justified scientific questions that can be addressed by observations with XMM‐Newton. XMM‐Newton has over the next decade a solid scientific case. Given the high impact of X‐ray observations, XMM‐Newton operations are not only a matter for “X‐ray astrophysics”, but also of fundamental importance for astrophysics in general. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) 相似文献
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伽马射线作为宇宙中极端事件的独特探针,探测伽马射线是人们了解宇宙构成、星体演化和宇宙线起源等的重要途经.伽马天文涉及了宇宙中的各种前沿科学问题并且观测所需能谱跨度极宽(102 keV–102 TeV),针对不同的科学目标和细分谱段,必须利用不同的伽马望远镜探测技术.总结了空间和地面的共5大类伽马射线观测技术,分别是编码孔径望远镜、康普顿望远镜、电子对望远镜、成像大气切伦科夫望远镜和广延大气簇射阵列;回顾了70 yr来在观测设备和技术进步的推动下伽马射线天文学领域的巨大进展,其中包含高能和甚高能谱段取得的大量成就,中低能段由于已有观测任务有限以及灵敏度低,超高能和极高能段由于观测难度大、起步时间晚,数据和成果相对其他谱段产出较少;展望了未来已经规划的伽马望远镜任务、能力及预期科学产出,其中,中低能段空间望远镜增强型ASTROGAM望远镜(e-ASTROGAM)、全天区中能伽马射线观测站(AMEGO)和甚高能段地面望远镜阵列高海拔宇宙线观测站(LHAASO)、切伦科夫望远镜阵列(CTA),由于灵敏度较同谱段已有任务灵敏度有大幅提升,极有可能在20 yr内从不同角度再度扩展人类对伽马宇宙的认知. 相似文献
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C. Michaut T. Vinci L. Boireau M. Koenig S. Bouquet A. Benuzzi-Mounaix N. Osaki G. Herpe E. Falize B. Loupias S. Atzeni 《Astrophysics and Space Science》2007,307(1-3):159-164
This paper deals with the radiative shock from both theoretical and numerical points of view. It is based on the whole experimental
results obtained at Laboratoire d'Utilisation des Lasers Intenses (LULI, école Polytechnique). Radiative shocks are high-Mach
number shocks with a strong coupling between radiation and hydrodynamics which leads to a structure governed by a radiative
precursor. These shocks are involved in various astrophysical systems: stellar accretion shocks, pulsating stars, interaction
between supernovae and the interstellar medium. In laboratory, these radiative shocks are generated using high power lasers.
New diagnostics have been implemented to study the geometrical shape of the shock and the front shock density. Data were obtained
varying initial conditions for different laser intensities and temperature. The modeling of these phenomena is mainly performed
through numerical simulations (1D and 2D) and analytical studies. We exhibit results obtained from several radiative hydrodynamics
codes. As a result, it is possible to discuss about the influence of the geometry and physical parameters introduced in the
1D and 2D models. 相似文献
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Saibal Ray 《Astrophysics and Space Science》2002,280(4):345-355
Static spherically symmetric charged dust models, known as Lane-Emden electromagnetic mass models, having their seed in the
well-known Lane-Emden equations of classical astrophysics, have been derived for Einstein-Cartan theory. The models are of
purely electromagnetic origin. The physical significance of these solutions can be understood from the very fact (i) that
they are generated from the well-known Lane-Emden equations of classical astrophysics having a proven physical foundation
and (ii) that, being the solution of Einstein-Cartan theory, they involve spin and torsion, characteristics which a material
system must possess for its subtle and finer details. PACS number(s): 04.90.+e, 04.20.jb.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献