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Perturbation due to a Circumbinary Disc around L4,5 in the Photogravitational Elliptic Restricted Three-Body Problem 光引力椭圆受限三体问题中l4,5附近的环双星盘引起的扰动
Pub Date : 2021-10-26 DOI: 10.18052/www.scipress.com/ilcpa.87.22
Umar Aishetu, Kamfa A. Salisu, Bashir Umar
The motion is investigated of dust/gas particles in the elliptic restricted three-body problem (ER3BP) in which the less massive primary is an oblate spheroid and the more massive a luminous body surrounded by a circumbinary disk. The paper has investigated both analytically and numerically the effects of oblateness and radiation pressure of the primaries respectively together with the gravitational potential from a disk on the triangular equilibrium L4,5 of the system, all in the elliptic framework of the restricted problem of three bodies. The important result obtained therein is a move towards the line joining the primaries in the presence of any /all perturbation(s). A significant shift away from the origin as the radiation pressure factor decreases and oblateness of the smaller primary increase is also observed. It is also seen that, all aforementioned parameters in the region of stability have destabilizing tendencies resulting in a decrease in the size of the region of stability except the gravitational potential from the disc. The binary system Ruchbah in the constellation Cassiopeiae is an excellent model for the problem, using the analytic results obtained, the locations of the triangular points and the critical mass parameter are computed numerically.
研究了椭圆限制三体问题(ER3BP)中尘埃/气体粒子的运动,其中质量较小的主星是一个扁球体,质量较大的是一个被环双星盘包围的发光体。本文在三体限制问题的椭圆框架下,分别用解析法和数值法研究了初星的扁率和辐射压力以及圆盘的引力势对系统的三角形平衡L4、5的影响。其中得到的重要结果是,在存在任何/所有扰动的情况下,向连接原色的线移动。随着辐射压力因子的减小,一个明显的远离原点的偏移也被观察到,较小的初次增加呈扁平化。还可以看出,除来自盘的引力势外,稳定区内的上述参数均有不稳定的倾向,导致稳定区的大小减小。仙后座双星系统Ruchbah是一个很好的模型,利用得到的解析结果,对三角点的位置和临界质量参数进行了数值计算。
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引用次数: 0
The Planetary Vaporization Event Hypothesis: Supercharging Earth’s Geothermal Core, Identifying Side Effects Blast Patterns, and Inferring how to Find Earth-Like Planets or Identifying Super Charged Geothermal Cores and their Byproduct Blast Patterns 行星汽化事件假说:增压地球地热核,识别副作用爆炸模式,并推断如何找到类地行星或识别增压地热核及其副产品爆炸模式
Pub Date : 2021-10-26 DOI: 10.18052/www.scipress.com/ilcpa.87.1
Aaron R. Hurst
The supercharged nature of the Earth’s geothermal core can be demonstrated by three thought experiments exhibiting it is tremendously more powerful than any other terrestrial object in the solar system (planet or moon). Identifying a minimum of four byproduct asteroid blast patterns linked to the formation of Earth’s supercharged geothermal core is critical to properly identifying stars that also have these four byproduct asteroid blast patterns. These stars are the most likely to host an Earth-like planet qualified by having a supercharged geothermal core. The Planetary Vaporization-Event (PVE) Hypothesis provides a basis for correlation between the supercharged nature of Earth’s geothermal core and at least 14 listed side effects: (1) the asteroid-wide/planet-scale homogenization and lack thereof of 182W ε for Earth, the Moon, Mars and meteors, (2) the primary and secondary shifting of Earth’s tectonic plates, (3) the solar system wide displacement of Earth’s wayward moons (including Ceres, Pluto, Charon and Orcus) outgassing identical samples of ammoniated phyllosilicates, (4) the formation of asteroids at 100+ times the expected density of a nebular cloud vs. pre-solar grains formation density at the expected density of a nebular cloud, (5) three distinct formation timestamps for all known asteroids within a 5 million year window 4.55+ billion years ago, (6) the estimated formation temperature of CAI at 0.86 billion Kelvin and (7) the remaining chondritic meteorite matrix flash vaporizing at 1,200–1,900 °C, (8) followed by rapid freezing near 0 K, (9) the development of exactly 2 asteroid belts and a swarm of non-moon satellites, (10) particulate size distinction between the 2 asteroid belts of small/inner, large/outer, (11) the proximity of the Trojan Asteroid Groups to the Main Asteroid Belt, (12) observation of a past or present LHB, (13) the development of annual meteor showers for Earth proximal to apogee and/or perigee, (14) the Sun being the most-likely object struck by an asteroid in the inner solar system. Through better understanding of the relevant data at hand and reclassification of the byproducts of supercharging the core of a planet, at least 5 new insights can be inferred and are listed as: (1) the original mass, (2) distance and (3) speed of Earth Mark One, (4) the original order of Earth’s multi-moon formation and (5) the high probability of finding detectable signs of life on a planet orbiting the stars Epsilon Eridani and Eta Corvi. There are at least 6 popular hypothesis that the PVE Hypothesis is in conflict with, listed they are: (1) a giant impact forming the Moon, (2) asteroids being the building blocks of the solar system, (3) the Main Asteroid Belt being the result of a planet that never formed, (4) the LHB being a part of the accretion disk process, (5) the heat in Earth’s core coming primarily from the decay of radioactive elements, (6) the Oort Cloud being the source of ice comets.
地球地热核的增压性质可以通过三个思想实验来证明,它们比太阳系中任何其他地球物体(行星或月球)都要强大得多。确定至少四种与地球增压地热核形成有关的小行星爆炸副产物,对于正确识别同样具有这四种小行星爆炸副产物的恒星至关重要。这些恒星最有可能拥有一颗类似地球的行星,因为它有一个增压的地热核心。行星汽化事件(PVE)假说为地球地热核心的增压性质与至少14种列出的副作用之间的相关性提供了基础:(1)地球、月球、火星和流星的182W ε在小行星/行星尺度上的均匀化和缺乏;(2)地球构造板块的一次和二次移动;(3)地球的卫星(包括谷神星、冥王星、冥卫一和奥库斯)在太阳系范围内的位移,释放出相同的氨化层状硅酸盐样品。(4) 100多倍星云云预期密度下的小行星与星云云预期密度下的前太阳颗粒形成密度的对比;(5)45.5亿年前500万年窗口内所有已知小行星的三个不同的形成时间标记;(6)CAI的估计形成温度为8.6亿开尔文;(7)剩余的球粒陨石基质在1200 - 1900℃时快速汽化,(8)随后在0 K附近快速冻结。(9)两条小行星带和一群非月球卫星的发展,(10)小/内、大/外两条小行星带的颗粒大小区别,(11)特洛伊小行星群与主小行星带的接近,(12)对过去或现在的LHB的观测,(13)地球近地至远地点和/或近地点每年流星雨的发展,(14)太阳是内太阳系中最可能被小行星撞击的物体。通过更好地了解现有的相关数据和对行星核心增压的副产品的重新分类,至少可以推断出5个新的见解,它们分别是:(1)地球标记一号的原始质量,(2)距离和(3)速度,(4)地球多卫星形成的原始顺序,(5)在围绕Epsilon Eridani和Eta Corvi恒星运行的行星上发现可探测生命迹象的高概率。至少有6个流行的假说,通过假设冲突,他们列出:(1)月球形成了一个巨大的影响,(2)小行星是太阳系的构建块,(3)主要小行星带是行星从未形成的结果,(4)LHB吸积盘过程的一部分,(5)热在地球的核心主要来自放射性元素的衰变,(6)奥尔特云被冰彗星的来源。
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引用次数: 0
Utilization of Agro-Waste in the Elimination of Dyes from Aqueous Solution: Equilibrium, Kinetic and Thermodynamic Studies 利用农业废弃物去除水溶液中的染料:平衡、动力学和热力学研究
Pub Date : 2021-04-01 DOI: 10.18052/WWW.SCIPRESS.COM/ILCPA.86.11
N. J. Okorocha, C. E. Omaliko, C. C. Osuagwu, M. Chijioke-Okere, C. K. Enenebeaku
The prospective of maize cob powder (MCP) as an effective adsorbent for the removal of malachite green (MG) and congo red (CR) dyes from aqueous solution was investigated. The presence of functional groups and pores on maize cob powder were confirmed by FTIR and SEM analysis. Batch adsorption studies were conducted and various parameters such as contact time, adsorbent dosage, initial dye concentration, pH and temperature were examined to observe their effects in the dyes adsorption process. The optimum conditions for the adsorption of MG and CR onto the adsorbent (MCP) was found to be: contact time (60mins), pH (10.0) and temperature (303 K), adsorbent dose (1 g) for an initial MG dye concentration of 50 mg/L and contact time (80mins), pH (2.0) and temperature (343 K) for an initial CR dye concentration of 50 mg/L and adsorbent dose 1.0 g respectively. The experimental equilibrium adsorption data fitted best and well to the Freundlich isotherm model for CR dye adsorption and Langmuir Isotherm for MG adsorption. The maximum adsorption capacity was found to be 13.02 mg/g and 9.41 mg/g for the adsorption of MG and CR dyes respectively. The kinetic data conformed to the pseudo-second-order kinetic model. Thermodynamic quantities such as Gibbs free energy (ΔG0), enthalpy (ΔH0) and entropy (ΔS0) were evaluated and the negative values of ΔG0, ΔH0 and ΔS0 obtained indicated the spontaneous and exothermic nature of the MG adsorption process while positive enthalpy (ΔH0) indicated an endothermic nature of CR adsorption process.
研究了玉米芯粉(MCP)作为去除孔雀石绿(MG)和刚果红(CR)染料的有效吸附剂的前景。FTIR和SEM分析证实玉米芯粉上存在官能团和气孔。进行了批量吸附实验,考察了接触时间、吸附剂用量、初始染料浓度、pH和温度等参数对染料吸附过程的影响。MG和CR在吸附剂(MCP)上吸附的最佳条件为:接触时间(60min)、pH(10.0)和温度(303 K)、吸附剂剂量(1 g) (MG染料初始浓度为50 MG /L)、接触时间(80min)、pH(2.0)和温度(343 K) (CR染料初始浓度为50 MG /L、吸附剂剂量为1.0 g)。实验平衡吸附数据与CR染料吸附的Freundlich等温线模型和MG吸附的Langmuir等温线模型吻合较好。对mg和CR染料的最大吸附量分别为13.02 mg/g和9.41 mg/g。动力学数据符合准二级动力学模型。对吉布斯自由能(ΔG0)、焓(ΔH0)和熵(ΔS0)等热力学量进行了计算,得到的ΔG0、ΔH0和ΔS0的负值表示MG吸附过程为自发和放热性质,而正焓(ΔH0)表示CR吸附过程为吸热性质。
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引用次数: 3
Motion in the Restricted Three-Body Problem at the Nanoscale 纳米尺度下受限三体问题中的运动
Pub Date : 2021-04-01 DOI: 10.18052/WWW.SCIPRESS.COM/ILCPA.86.1
J. Singh, T. Richard
This paper studies the classical restricted three-body problem of a carbon atom in the vicinity of two carbon 60 fullerenes (  fullerenes) at the nanoscale. The total molecular energy between the two fullerenes is determined analytically by approximating the pairwise potential energies between the carbon atoms on the fullerenes by a continuous approach. Using software MATHEMATICA, we compute the positions of the stationary points and their stability for a carbon atom at the nanosacle and it is observed that for each set of values, there exists at least one complex root with the positive real part and hence in the Lyapunov sense, the stationary points are unstable. Since only attractive Van der Waals forces contribute to the orbiting behavior, no orbiting phenomenon can be observed for , where the Van der Waals forces becomes repulsive. Although the  orbital is speculative in nature and also presents exciting possibilities, there are still many practical challenges that would need to be overcome before the  orbital might be realized. However, the present theoretical study is a necessary precursor to any of such developments.
本文研究了纳米尺度上碳原子在两个碳60富勒烯(富勒烯)附近的经典限制三体问题。两个富勒烯之间的总分子能是通过连续逼近富勒烯上碳原子之间的配对势能来解析确定的。利用MATHEMATICA软件计算了碳原子在纳米尺度上的驻点位置及其稳定性,结果表明,对于每一组值,至少存在一个实部为正的复根,因此在李亚普诺夫意义上,驻点是不稳定的。由于只有吸引的范德华力对轨道行为有贡献,所以在范德华力变为排斥的情况下,无法观察到轨道现象。虽然轨道在本质上是推测性的,也呈现出令人兴奋的可能性,但在轨道可能实现之前,仍有许多实际挑战需要克服。然而,目前的理论研究是任何此类发展的必要先驱。
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引用次数: 1
Investigations of Recently Discovered Supernova Remnants’ Spectral Plot: AT2019fya, SN2019fjp, SN2019fcc, SN2019fbv, SN2019ffi, and SN2019fce 新发现超新星遗迹光谱图:AT2019fya、SN2019fjp、SN2019fcc、SN2019fbv、SN2019ffi和SN2019fce的研究
Pub Date : 2020-12-01 DOI: 10.18052/www.scipress.com/ilcpa.84.1
B. J. R. Raquel, Agnes C. Bantaculo, Shane Carlo B. Llemit, Eldrin P. Custodio
This paper presents the spectroscopic graphs of recently discovered Supernova Remnants (AT2019fya, SN2019fjp, SN2019fcc, SN2019fce, SN2019fbv & SN2019ffi) for the determination of elements present. The researchers use the spectral plot analysis to analyze the presence of certain elements of the individual supernova remnants (SNR) for the assimilation, differentiation and classification of these SNR. Redshift and velocities of these SNR were also found using the observed wavelength and the rest wavelength ratio. Comparison suggests that AT2019fya is a Type II supernova remnant and some of the SNRs in this study exhibits an existence of krypton (Kr) on their composition which is recently discovered by M. Barlow (2013) to be present at the Crab Nebula. This might suggest that AT2019fya, SN2019fbv, SN2019fce, and SN2019ffi have a pulsar at their center.
本文介绍了最近发现的超新星遗迹(AT2019fya, SN2019fjp, SN2019fcc, SN2019fce, SN2019fbv和SN2019ffi)的光谱图,用于测定存在的元素。研究人员使用光谱图分析来分析单个超新星遗迹(SNR)中某些元素的存在,以同化、区分和分类这些SNR。利用观测到的波长和剩余波长比,还得到了这些信噪比的红移和速度。比较表明,AT2019fya是II型超新星遗迹,本研究中的一些信噪比在其组成中显示出氪(Kr)的存在,这是M. Barlow(2013)最近在蟹状星云中发现的。这可能表明,AT2019fya、SN2019fbv、SN2019fce和SN2019ffi的中心有一颗脉冲星。
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引用次数: 0
Cooxidation of Dibenzalacetone with Oxalic Acid by Pyrazinium Chlorochromate 氯铬酸吡嗪与草酸共氧化二苯甲丙酮
Pub Date : 2020-12-01 DOI: 10.18052/www.scipress.com/ilcpa.85.1
S. K. Periyasamy, R. Ponmadasamy
Oxidation of dibenzalacetone with pyrazinium chlorochromate in presence of oxalic acid has been studied at 313 K. Various reaction parameters such as effect of varying oxidant, substrate, Hydrogen ion concentration, catalyst, solvent composition, ionic strength, effect of Mn2+, effect of Al3+ and effect of temperature were studied to determine the kinetics of the reaction. Our study revealed that the reaction followed first order dependence with respect to oxidant and catalyst. The reaction followed fractional order kinetics with respect to substrate and H+. Increase in ionic strength was found to have no effect on the reaction rate and decrease in the dielectric constant of the medium decreases the reaction rate. Increase in the concentration of manganous sulphate retarded the reaction rate which confirmed the two-electron transfer involved in the mechanism. There was no possibility of free radical mechanism, which was confirmed by the addition of acrylonitrile shows no significant effect on the reaction rate indicating the non-involvement of free radical reaction.. Based on the experimental observations a mechanism and rate law has been derived. Moreover, the oxidation product was found to be chalcone epoxide, which was characterized by IR spectrum.
研究了草酸存在下吡嗪氯铬酸盐在313k下氧化二苯甲丙酮。考察了氧化剂、底物、氢离子浓度、催化剂、溶剂组成、离子强度、Mn2+、Al3+、温度等因素对反应动力学的影响。我们的研究表明,该反应对氧化剂和催化剂具有一级依赖性。反应对底物和H+的反应遵循分数级动力学。离子强度的增加对反应速率没有影响,介质介电常数的降低使反应速率降低。硫酸锰浓度的增加减慢了反应速率,证实了双电子转移参与了反应机理。不存在自由基机制的可能性,丙烯腈的加入证实了这一点,对反应速率没有显著影响,表明自由基不参与反应。根据实验观察,推导出了反应机理和速率规律。氧化产物为环氧查尔酮,并用红外光谱对其进行了表征。
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引用次数: 0
Synthesis and Evaluation of Thermodynamic Solubility of Triazolo Quinolone Class Derivatives in Various Solvents at 298.15-328.15 K 298.15 ~ 328.15 K下三唑啉类喹诺酮类衍生物的合成及热力学溶解度评价
Pub Date : 2020-12-01 DOI: 10.18052/www.scipress.com/ilcpa.84.11
S. Baluja, Mona Pithiya, Asmita Hirapara, D. Lava
The solubility of triazolo quinolone class derivatives in methanol, ethanol, n-propanol, n-butanol and ethyl acetate was measured using a gravimetrical method at temperature ranging from 298.15 K to 328.15 K. The results of these measurements were correlated with semi empirical equations. Some thermodynamic parameters such as dissolution enthalpy, Gibb’s free energy and entropy of mixing have also been calculated.
用重量法测定了三唑啉喹诺酮类衍生物在甲醇、乙醇、正丙醇、正丁醇和乙酸乙酯中的溶解度,温度范围为298.15 ~ 328.15 K。这些测量结果与半经验方程相关。同时计算了溶解焓、吉布自由能和混合熵等热力学参数。
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引用次数: 0
Anti-Inflammatory and Antimicrobial Activities of Powered and Ethanaol Extracts of Scent Leaf (Ocimum gratissimum) and Curry Leaf (Murraya koenigii) 香叶和咖喱叶动力提取物和乙醇提取物的抗炎和抗菌活性
Pub Date : 2020-12-01 DOI: 10.18052/www.scipress.com/ilcpa.85.15
E. L. Onyeyilim, M. A. Ezeokonkwo, C. Uzoewulu, F. U. Eze, Festus Chinonso Urama, C. C. Eze, V. O. Okonkwo, I. Otunomo
In this manuscript, the authors explore the antimicrobial and anti-inflammatory properties of extracts from two commonly found and used leaves from species Murraya koenigii and Ocimum gratissimum L., Ethanolic extracts were obtained by maceration and were then concentrated. Serial dilutions of the extracts were done for testing. The extracts were tested for growth inhibition of four bacterial and two fungal strains. Visual examination of growth inhibition, compared to standard antibiotic controls, provided minimum inhibitory concentrations for the two extracts against the six microbial strains. In another experiment, the authors test the anti-inflammatory properties of the two leaf extracts in the standard rat-paw model of inflammation. Results from growth inhibition studies suggest that the two leaf extracts inhibit the growth of all six microbes, with varying levels of sensitivity. Results from anti-inflammatory studies are more impressive, with leaf extracts inhibiting inflammation at levels competitive with the standard drug, indomethacin.
在这篇文章中,作者探索了两种常见和使用的植物Murraya koenigii和Ocimum gratissimum L.的叶子提取物的抗菌和抗炎特性,乙醇提取物通过浸渍得到,然后浓缩。连续稀释提取物进行测试。对四种细菌和两种真菌进行了抑菌试验。与标准抗生素对照相比,生长抑制目视检查提供了两种提取物对六种微生物菌株的最低抑制浓度。在另一项实验中,作者在标准的大鼠爪子炎症模型中测试了两种叶子提取物的抗炎特性。生长抑制研究的结果表明,两种叶子提取物抑制所有六种微生物的生长,具有不同程度的敏感性。抗炎研究的结果更令人印象深刻,叶子提取物抑制炎症的水平与标准药物吲哚美辛相当。
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引用次数: 0
Molecular Docking and QSAR Study of Chalcone and Pyrimidine Derivatives as Potent Anti-Malarial Agents against Plasmodium falciparum 查尔酮和嘧啶衍生物抗恶性疟原虫的分子对接和QSAR研究
Pub Date : 2020-12-01 DOI: 10.18052/www.scipress.com/ilcpa.85.23
Dayena J. Christian, Rajesh H. Vekariya, Kinjal D. Patel, D. Rajani, Smita D. Rajani, K. Parmar, M. T. Chhabaria, H. Patel
A data set of chalcone and pyrimidine derivatives with anti-malarial activity against Plasmodium falciparum was employed in investigating the quantitative structure-activity relationship (QSAR). Molecular docking study was performed for plasmodium falciparum dihydrofolate reductase (PfDHFR-TS). Genetic function approximation (GFA) technique was used to identify the descriptors that have influence on anti-malarial activity. The most influencing molecular descriptors identified include thermodynamics, structural and physical descriptors. Generated model was found to be good based on correlation coefficient, LOF, rm2 and rcv2 values. Nrotb, solubility, polarizibility may have negative influence on antimalarial activity or play an important role in growth inhibition of Plasmodium falciparum. The QSAR models so constructed provide fruitful insights for the future development of anti-malarial agents.
利用查尔酮和嘧啶衍生物对恶性疟原虫具有抗疟活性的数据集,研究其定量构效关系(QSAR)。对恶性疟原虫二氢叶酸还原酶(PfDHFR-TS)进行分子对接研究。利用遗传功能近似(GFA)技术鉴定对抗疟疾活性有影响的描述子。确定的最具影响力的分子描述符包括热力学、结构和物理描述符。根据相关系数、LOF、rm2和rcv2值,发现生成的模型是良好的。耐蚀性、溶解度、极化性可能对抗疟活性产生负面影响或在抑制恶性疟原虫生长中发挥重要作用。由此构建的QSAR模型为未来抗疟疾药物的开发提供了富有成效的见解。
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引用次数: 0
Synergistic Effect of Cationic Surfactants in Adsorption 阳离子表面活性剂在吸附中的协同作用
Pub Date : 2019-08-01 DOI: 10.18052/WWW.SCIPRESS.COM/ILCPA.83.31
T. Kasilingam, C. Thangavelu
The corrosion behaviour of cationic surfactants, namely: cetyl trimethyl ammonium bromide (CTAB) and dodecyl trimethyl ammonium bromide (DTAB), have been used as corrosion inhibitors for carbon steel in well water. Protection efficiencies of the studied surfactants were depended on the hydrophobic chain length and concentration of the surfactants. The results shows that the order of protection efficiency is CTAB > DTAB. Tafel curves showed these surfactants are acting as an anodic inhibitors. Nyquist curves revealed that a protective film is formed on the metal surface. FTIR spectra suggest that the tested surfactants protective film consists of Fe2+-CTAB, Fe2+-DTAB and Zn(OH)2. Protection efficiency values and synergism parameters obtained weight loss; potentiodynamic polarization and electrochemical impedance spectroscopy are consistent.
用阳离子表面活性剂十六烷基三甲基溴化铵(CTAB)和十二烷基三甲基溴化铵(DTAB)作为碳钢在井水中的缓蚀剂进行了研究。所研究的表面活性剂的保护效率取决于疏水链的长度和表面活性剂的浓度。结果表明,CTAB > DTAB的保护效率依次为:塔菲尔曲线显示这些表面活性剂具有阳极抑制剂的作用。奈奎斯特曲线显示在金属表面形成了一层保护膜。FTIR光谱表明,所测表面活性剂保护膜由Fe2+-CTAB、Fe2+-DTAB和Zn(OH)2组成。得到的减重保护效率值和增效参数;动电位极化和电化学阻抗谱是一致的。
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引用次数: 0
期刊
International Letters of Chemistry, Physics and Astronomy
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