scholarly journals Heat, work and subtle fluids: a commentary on Joule (1850) ‘On the mechanical equivalent of heat’

2015 ◽  
Vol 373 (2039) ◽  
pp. 20140348 ◽  
Author(s):  
John Young
Keyword(s):  
Second Law Of Thermodynamics ◽  
Scientific Work ◽  
Conservation Of Energy ◽  
First Law Of Thermodynamics ◽  
Mechanical Equivalent ◽  
Scientific Establishment ◽  
Series Of Experiments ◽  
Scientists And Engineers ◽  
350Th Anniversary

James Joule played the major role in establishing the conservation of energy, or the first law of thermodynamics, as a universal, all-pervasive principle of physics. He was an experimentalist par excellence and his place in the development of thermodynamics is unarguable. This article discusses Joule's life and scientific work culminating in the 1850 paper, where he presented his detailed measurements of the mechanical equivalent of heat using his famous paddle-wheel apparatus. Joule's long series of experiments in the 1840s leading to his realisation that the conservation of energy was probably of universal validity is discussed in context with the work of other pioneers, notably Sadi Carnot, who effectively formulated the principle of the second law of thermodynamics a quarter of a century before the first law was accepted. The story of Joule's work is a story of an uphill struggle against a critical scientific establishment unwilling to accept the mounting evidence until it was impossible to ignore. His difficulties in attracting funding and publishing in reputable journals despite the quality of his work will resonate with many young scientists and engineers of the present day. This commentary was written to celebrate the 350th anniversary of the journal Philosophical Transactions of the Royal Society .

Nineteenth Century

2017 ◽  
Author(s):  
Don S. Lemons
Keyword(s):  
Nineteenth Century ◽  
Second Law Of Thermodynamics ◽  
Magnetic Effect ◽  
Second Law ◽  
Experimental Demonstration ◽  
Electrical Currents ◽  
First Law Of Thermodynamics ◽  
Mechanical Equivalent ◽  
Romantic Movement

The Romantic Movement gave impetus to a process of unifying the forces of nature – an impetus that bore fruit in, especially, Oersted’s demonstraton of the magnetic effect of electrical currents (1820) and Maxwell’s theory of electromagnetism (1865). Also, during this period Sadi Carnot articulated the first version of the second law of thermodynamics (1836) while James Joule’s painstaking experimental demonstration of the mechanical equivalent of heat (1847) is an essential foundation of the first law of thermodynamics.

scholarly journals Analysis of Exergy and Energy of Gasifier Systems for Coal-to-Fuel

2012 ◽  
pp. 246-252
Author(s):  
Nishant Sharma ◽  
Bhupendra Gupta ◽  
Ranjeet Pratap Singh Chauhan
Keyword(s):  
Exergy Analysis ◽  
Second Law Of Thermodynamics ◽  
Conservation Of Energy ◽  
Synthetic Natural Gas ◽  
Entrained Flow ◽  
Technology Improvement ◽  
Water Quench ◽  
Entrained Flow Gasifier ◽  
Quench Cooling

The purpose of this study is to investigate the performance features of coal-to-fuel systems based on different gasification technologies. The target products are the Fischer–Tropsch synthetic crude and synthetic natural gas. Two types of entrained-flow gasifierbased coal-to-fuel systems are simulated and their performance features are discussed. One is a single-stage water quench cooling entrained-flow gasifier, and another one is a two-stage syngas cooling entrained-flow gasifier. The conservation of energy (first law of thermodynamics) and the quality of energy (second law of thermodynamics) for the systems are both investigated. The results of exergy analysis provide insights about the potential targets for technology improvement. The features of different gasifier-based coal-to-fuel systems are discussed. The results provide information about the research and development priorities in future.

Exergy Distribution Characters Analysis of a 130t/h Biomass-Fired Boiler

2015 ◽  
Vol 713-715 ◽  
pp. 1356-1359
Author(s):  
Fang Yang ◽  
Chang Qing Dong ◽  
Zhi Zhong Kang ◽  
Zong Ming Zheng ◽  
Xiao Ying Hu
Keyword(s):  
Heat Balance ◽  
Exergy Analysis ◽  
Second Law Of Thermodynamics ◽  
Energy Utilization ◽  
Analysis Model ◽  
The Real ◽  
First Law Of Thermodynamics ◽  
The Heat Balance ◽  
Exergy Losses

Currently, most of the boilers in power plant are designed by the heat balance based on first law of thermodynamics only, and it analyses the condition of using energy from the perspective of quantity of energy. However, The real energy utilization should be justified not only from the quantity but also from the quality, because the quality of energy based on second law of thermodynamics can reflect the irreversibility in processes and components. In order to revealing the real energy losses, we must establish exergy analysis model of 130t/h Biomass-Fired Boiler. This article calculates the exergy losses of all kinds of boiler surface and the overall exergy efficiency of boiler, together with exergy distribution characters analysis result of 130t/h Biomass-Fired Boiler. The results obtained open out the greatest exergy loss and the place to generate these losses of boiler, and provide scientific gist for improving utilization of boiler energy.

The fate of formaldehyde in sugar manufacture and in products

2015 ◽  
pp. 692-696
Author(s):  
Remi Aubry ◽  
Laurence Gasnot
Keyword(s):  
Sugar Industry ◽  
Common Knowledge ◽  
Microbial Populations ◽  
Optimal Dosage ◽  
Consumer Health ◽  
Microbiological Activity ◽  
Specific Process ◽  
Beet Sugar ◽  
Series Of Experiments

A study was carried out in six beet sugar factories in France during the 2012/13 sugar campaign. The objective was to assess the optimal dosage of formaldehyde solutions at specific process stages and in different existing factory set-ups in order to obtain the desired effect on microbial populations, without interference with the quality of the products. In addition harmlessness regarding consumer health was to be demonstrated. A series of experiments was conducted resulting in new data allowing refreshment of common knowledge and references existing regarding the use of formaldehyde solutions in the sugar industry. The effectiveness and convenience for controlling microbiological activity in beet sugar manufacture was assessed. Formaldehyde reduces sugar losses and protects in-process products without harming their further use, such as for ethanol production.

Conservation of Energy Readings on the Origins of the First Law of Thermodynamics. Part I

2011 ◽  
Vol 19 (2) ◽  
pp. 159 ◽  
Author(s):  
Jaime Wisniak
Keyword(s):  
Conservation Of Energy ◽  
First Law Of Thermodynamics

Los conceptos de masa, movimiento y energía han ocupado la atención de filósofos y científicos desde tiempos ancestrales. Aun cuando hubo muchos que creían que la masa y la energía se conservaban, debieron pasar muchos años hasta que la primera ley de la termodinámica adquiriera su forma actual. La ley de conservación de la energía es uno de los principios fundamentales del mundo físico como lo entendemos hoy. Negar la posibilidad del movimiento perpetuo le coloca un límite superior a la utilización de la energía y a la eficiencia termodinámica de un proceso.

A ‘Galilean’ science of language

2014 ◽  
Vol 50 (3) ◽  
pp. 671-704 ◽  
Author(s):  
CHRISTINA BEHME
Keyword(s):  
Language Evolution ◽  
Relevant Literature ◽  
Child Psychology ◽  
Scientific Work ◽  
Poor Quality ◽  
The Poor ◽  
Recent Scholarship ◽  
Basic Understanding ◽  
Sixth Decade

The Science of Language, published in the sixth decade of Noam Chomsky's linguistic career, defends views that are visibly out of touch with recent research in formal linguistics, developmental child psychology, computational modeling of language acquisition, and language evolution. I argue that the poor quality of this volume is representative of the serious shortcomings of Chomsky's recent scholarship, especially of his criticism of and contribution to debates about language evolution. Chomsky creates the impression that he is quoting titbits of a massive body of scientific work he has conducted or is intimately familiar with. Yet his speculations reveal a lack of even basic understanding of biology, and an unwillingness to engage seriously with the relevant literature. At the same time, he ridicules the work of virtually all other theorists, without spelling out the views he disagrees with. A critical analysis of the ‘Galilean method’ demonstrates that Chomsky uses appeal to authority to insulate his own proposals against falsification by empirical counter-evidence. This form of discourse bears no serious relation to the way science proceeds.

Thermodynamic Analysis of a Multi-Fueled Single Cylinder SI Engine

2011 ◽  
Author(s):  
M. Z. Haq ◽  
M. R. Mohiuddin
Keyword(s):  
Thermodynamic Analysis ◽  
Chemical Properties ◽  
Second Law Of Thermodynamics ◽  
Second Law ◽  
Si Engine ◽  
Gaseous Species ◽  
Single Cylinder ◽  
Engine Cylinder ◽  
Si Engines

The paper presents a thermodynamic analysis of a single cylinder four-stroke spark-ignition (SI) engine fuelled by four fuels namely iso-octane, methane, methanol and hydrogen. In SI engines, due to phenomena like ignition delay and finite flame speed manifested by the fuels, the heat addition process is not instantaneous, and hence ‘Weibe function’ is used to address the realistic heat release scenario of the engine. Empirical correlations are used to predict the heat loss from the engine cylinder. Physical states and chemical properties of gaseous species present inside the cylinder are determined using first and second law of thermodynamics, chemical kinetics, JANAF thermodynamic data-base and NASA polynomials. The model is implemented in FORTRAN 95 using standard numerical routines and some simulation results are validated against data available in literature. The second law of thermodynamics is applied to estimate the change of exergy i.e. the work potential or quality of the in-cylinder mixture undergoing various phases to complete the cycle. Results indicate that, around 4 to 24% of exergy initially possessed by the in-cylinder mixture is reduced during combustion and about 26 to 42% is left unused and exhausted to the atmosphere.

THE RULE OF COMBINING A PRIORI AND EXPERIMENTAL INFORMATION IN THE TASKS OF MANAGING TESTS OF COMPLEX TECHNICAL PRODUCTS ACCORDING TO THE BERNOULLI SCHEME

2020 ◽  
pp. 3-13
Author(s):  
Yu. I. Buryak ◽  
A. A. Skrynnikov
Keyword(s):  
Field Experiments ◽  
A Priori ◽  
Field Tests ◽  
Experimental Information ◽  
Full Scale ◽  
Testing Complex ◽  
Series Of Experiments ◽  
Full Scale Tests ◽  
Technical Products

The article is devoted to the substantiation of the procedure for testing complex technical systems to assess the probability of performing the task, taking into account a priori data obtained from the results of modeling, field tests of components and prototypes, operation of analogues, etc. The conditions for the formation of a combined sample consisting of field experiments and experiments counted on the results of modeling are justified. Data uniformity is checked using the Student's criterion. The minimum volume of full-scale tests is determined by the requirement of equality of the amount of Fischer information about the estimated parameter obtained during full-scale tests and at the expense of a priori data A strategy for conducting field experiments is proposed, in which the required quality of evaluating the probability of completing the task is achieved with the minimum possible number of field experiments. At the first stage, a series of experiments with a volume equal to half of the required sample size is performed. At the second stage, the experiments are conducted sequentially with an assessment after each experiment of the requirements for the amount of information about the evaluated parameter and for the uniformity of data. Experiments are terminated when the specified requirements are met, and then a combined sample is formed, which is used to evaluate the probability of the system performing the task. A model example is considered. The estimation of the gain in the number of experiments performed at different probability values was carried out.

scholarly journals Analysis of supporting indicators for innovation in Romania compared to neighboring EU countries

2018 ◽  
Vol 184 ◽  
pp. 04020
Author(s):  
Bungau Constantin ◽  
Gherghea Ion Cosmin
Keyword(s):  
Research And Development ◽  
Innovation Process ◽  
Developed Countries ◽  
Firm Level ◽  
Industry Collaboration ◽  
Development Expenditure ◽  
Scientists And Engineers ◽  
Domestic Spending ◽  
University Industry

The paper presents a comparative study of indicators which targeting the facilities and support for the innovation process. The study targets indicators regarding human resources, support structure / infrastructure and legislative provisions. The analysis is carried out over the last 5 years, comparing the indicators in Romania and the neighboring countries (Bulgaria, Hungary, Austria, Slovakia and Poland) and highly developed countries (Germany and France). Based on this study, will be drawing conclusions for improvement of these indicators. The indicators that will be taken into consideration are: Availability of scientists and engineers, Researchers, Quality of the education system, Researchers in Research and Development, Research and development expenditure, Firm-level technology absorption, University-industry collaboration in Research & Development, Quality of scientific research institutions, Gross domestic spending on Research and Development, Property rights, Intellectual property protection.

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