The baryonic Tully-Fisher relation for different velocity definitions and implications for galaxy angular momentum

We study the baryonic Tully-Fisher relation (BTFR) at z=0 using 153 galaxies from the SPARC sample. We consider different definitions of the characteristic velocity from HI and H-alpha rotation curves, as well as HI line-widths from single-dish observations. We reach the following results: (1) The tightest BTFR is given by the mean velocity along the flat part of the rotation curve. The orthogonal intrinsic scatter is extremely small (6%) and the best-fit slope is 3.85+/-0.09, but systematic uncertainties may drive the slope from 3.5 to 4.0. Other velocity definitions lead to BTFRs with systematically higher scatters and shallower slopes. (2) We provide statistical relations to infer the flat rotation velocity from HI line-widths or less extended rotation curves (like H-alpha and CO data). These can be useful to study the BTFR from large HI surveys or the BTFR at high redshifts. (3) The BTFR is more fundamental than the relation between angular momentum and galaxy mass (the Fall relation). The Fall relation has about 7 times more scatter than the BTFR, which is merely driven by the scatter in the mass-size relation of galaxies. The BTFR is already the "fundamental plane" of galaxy discs: no value is added with a radial variable as a third parameter.Comment: 12 pages, 6 figures, accepted for publication in MNRA

Service Time Scheduling Method for Wireless Networks Powered by Renewable Energy

Tohoku University加藤

PROCESSES FOR PRODUCING DOXORUBICIN, DAUNOMYCINONE, AND DERIVATIVES OF DOXORUBICIN

To produce doxorubicin and its analogues methyl 3alpha, 5alpha-dihydroxy-5beta-(trimethylsilylethynyl)- 2alpha-nitromethylcyclohexane-1beta-carboxylate acetonide is condensed with 1,4-dihydro-4,4,5-trimethoxy-1-oxonaphthalene in the presence of 1,8-diazabicyclo-5.4.0]undec-7-ene in an aprotic solvent to produce 3-(2beta-carbomethoxy-4-beta-ethynyl-4-alpha, 6alpha-(di-O-isopropylidenyl)cyclohexanyl-1-yl)-nitromethyl-4,4,5-trimethoxy-1-oxo-1,2,3,4-tetrahydronaphthalene; which is cyclized to produce 9beta ethynyl-12-hydroxy-7alpha, 9alpha-(di-O-iso propylidenyl)-6-nitro-4,5,5-trimethoxy-5,5a,6- 6a,7,8,9,10,10a,11-decahydro -11-naphthacenone. The decahydro-11-naphthacenone is converted to 7alpha 9alpha,(di-O-isopropyl-idenyl)-4,5-dimethoxy-9beta ethynyl-12-hydroxy-6-nitro-6,6a,7,8,9,10,10a, 11 octahydro-11, -naphthacenone. The octahydro-11 naphthacenone is oxidized to 7alpha-9alpha, (di-O-iso propyl-idenyl)-9beta-ethynyl-11-hydroxy-4-methoxy-6- nitro-7,8,9,10-tetrahydro-5,12-naphthacenedione which is converted to 6-desoxy-6-nitrodaunomycinone, daunomycinone and related 6-substituted analogues of daunomycinone

Commuting probability for subrings and quotient rings

We prove that the commuting probability of a finite ring is no larger than the commuting probabilities of its subrings and quotients, and characterize when equality occurs in such a comparison

Restricting Voting Rights in Modern America

The Supreme Court’s Shelby County v. Holder ruling invalidating Section 4(b) of the Voting Rights Act of 1965 is in part a product of efforts to resist further transformations to the traditional American institutional arrangements that have conferred advantages on whites, especially disproportionate political power. Those efforts in resistance are not likely to succeed in the long run. But they may embroil American elections and American governance in paralyzing conflicts for years to come.La décision de la Cour suprême dans l’arrêt Comté de Shelby c. Holder, invalidant la Section 4 (b) de la Loi sur les droits de vote de 1965, est en partie le produit d’une volonté de maintenir les avantages particulièrement disproportionnée des Blancs en matière de pouvoir politique et de résister à toutes les nouvelles tentatives transformation des arrangements institutionnels américains traditionnels. Ces efforts de résistance ne sont pas susceptibles de réussir sur le long terme. Mais ils peuvent entrainer les élections américaines et la gouvernance américaine dans des conflits paralysants pour les années à venir

Reducing environmental hazards through reserve supply chain model

Environmental hazards transpire when industrial wastages are dumped illegally into vacant lands, rivers or low-lying areas. This is a major problem in developing, and less-developed countries where environmental regulations are not (or cannot be) strictly enforced. Researchers around the globe are conducting research to find various ways to minimize or eliminate industrial hazards. In this paper, we take a supply-chain approach and show how the concept of the reverse supply chain can be used to recycle industrial wastage into useful by-products. Our problem domain is poultry industry in Bangladesh. Using Simul8, a simulation model of reverse supply chain is developed for a large poultry plant in Bangladesh where poultry wastes are modelled to turn into various by-products. We use primary and secondary data to run the simulation model. Our results show that poultry wastes can indeed be processed to turn into various by products as bakery products, biogas, artificial charcoal, etc. The management of the poultry plant can use our results to develop policies to reduce poultry hazards and thus save the environment. We touch on research and managerial implications of our results

A simulation supply chain model for a sustainable and environment friendly poultry industry: Insights from Bangladesh

The focuses on environment and reverse supply chain have increased in recent years among academic and industry circle. Yet, Bangladesh poultry is to achieve environmental sustainability in her extended forward and reverse supply chain. In this paper, supply chain model developed based on a case poultry industry. Design science and case method under positivist and quantitative paradigm followed to develop simulation model using simul8 application to fit the real poultry case. The objectives of this paper are to review literature, develop simulation supply chain model and later tested it through historic data. The results briefly discussed and model capturing the relationship among forward, reverse and mainstream supply chain of the case. Different random trial runs of the simulation model have shown in the result section to find out optimality