scholarly journals On copper electrolysis in Vacuo

1894 ◽  
Vol 55 (331-335) ◽  
pp. 66-83 ◽  
Keyword(s):  
Simple Form ◽  
Copper Sulphate ◽  
Measuring Instruments ◽  
Copper Salts ◽  
Faraday’S Law ◽  
Physical Laboratory ◽  
Current Measuring ◽  
Made In

The following research upon the electrolysis of copper sulphate in vacuo was commenced nearly two years ago, at the suggestion of Dr. Schuster, and the experiments were made in the Physical Laboratory of the Owens College. The electrolysis of copper salts is interesting, not only theoretically as affording a verification of Faraday’s Law of Electrolytes, but also practically on account of its constant use in the graduation of current-measuring instruments, such as tangent galvanometers and ammeters. It is known that copper sulphate in solution does not conform rigorously to the simple form in which Faraday’s law is generally expressed.

A magnetic field simulating device for current measuring instruments testing purpose

2014 ◽  
Vol 28 (3) ◽  
pp. 301-309 ◽  
Author(s):  
M. Samplón-Chalmeta ◽  
Antonio Usón ◽  
Jesús Letosa ◽  
Joaquín Mur-Amada
Keyword(s):  
Magnetic Field ◽  
Measuring Instruments ◽  
Current Measuring

Half division two-dimensional method for simple sinusoidal quantities parameters accurate measurement

2021 ◽  
pp. 16-21
Author(s):  
Kirill Yu. Solomentsev ◽  
Vyacheslav I. Lachin ◽  
Aleksandr E. Pasenchuk
Keyword(s):  
Measuring Instruments ◽  
Measured Signal ◽  
Two Dimensional ◽  
Measuring Device ◽  
New Approach ◽  
Precision Measuring ◽  
Useful Signal ◽  
Midpoint Method ◽  
Order Of Magnitude ◽  
Current Measuring

Several variants of half division two-dimensional method are proposed, which is the basis of a fundamentally new approach for constructing measuring instruments for sinusoidal or periodic electrical quantities. These measuring instruments are used in the diagnosis of electric power facilities. The most general variant, called midpoint method, is considered. The proposed midpoint method allows you to measure much smaller than using widespread methods, alternating currents or voltages, especially when changing the amplitude of the measured signal in very wide ranges, by 1–2 orders of magnitude. It is shown that using the midpoint method it is possible to suppress sinusoidal or periodic interference in the measuring path, in particular, to measure small alternating current when sinusoidal or periodic interference is 1–2 orders of magnitude higher than the useful signal. Based on the results of comparative tests, it was found that the current measuring device implementing the midpoint method is an order of magnitude more sensitive than the currently used high-precision measuring instruments.

scholarly journals XX.—On the Thermal Conductivity and Specific Heat of Manganese-Steel

1890 ◽  
Vol 35 (4) ◽  
pp. 947-954 ◽  
Author(s):  
A. Crichton Mitchell
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Tensile Strength ◽  
Specific Heat ◽  
Manganese Steel ◽  
Physical Laboratory ◽  
The Subject ◽  
General Opinion ◽  
Made In

Until a few years ago it was the general opinion among metallurgists that the presence of manganese in steel exceeding the proportion of 1 per cent, is prejudicial to the value of the steel, inasmuch as a higher percentage of manganese has the effect of lowering markedly its tensile strength and toughness. But in 1884, Messrs Hadfield & Company, of the Hecla Steel Works, Sheffield, exhibited, at a meeting of the Institute of Mechanical Engineers, a number of samples of steel containing upwards of 10 to 15 per cent, of manganese, and submitted the results of experiments, which showed that the samples were, in point of tensile strength and hardness, in no way inferior to steel. Again, in 1888, Mr R. A. Hadfield read to the Institute a paper on the subject, giving the details of a large number of tests, which brought to light some interesting mechanical properties of alloys of manganese and iron. Since its introduction, these alloys (and particularly that containing 10 to 15 per cent, of manganese, known as “manganese-steel”) have been studied by several physicists, and further peculiarities have been found. It appeared desirable that the thermal conductivity of so peculiar a substance should be investigated. The present paper is an account of experiments made in the Physical Laboratory, Edinburgh University, with a view to the determination of its thermal conductivity. In the reduction of such experiments a knowledge of the specific heat is necessary, hence there is also given an account of experiments whereby the specific heat was determined.

Increasing the Accuracy of Magneto-Optical Current Measuring Instruments

2014 ◽  
Vol 57 (9) ◽  
pp. 1041-1045 ◽  
Author(s):  
A. I. Evstaf’ev ◽  
M. A. Urakseev
Keyword(s):  
Measuring Instruments ◽  
Current Measuring

scholarly journals An account of the pendulum observations connecting kew and greenwich observatories made in 1903

1906 ◽  
Vol 78 (524) ◽  
pp. 241-247
Keyword(s):  
National Physical Laboratory ◽  
Base Station ◽  
Central Bureau ◽  
Geodetic Institute ◽  
Secretary Of State ◽  
Physical Laboratory ◽  
The Government ◽  
Made In

1. The observations, of which a brief account is here given, had their origin in the decision of the Government of India to resume the pendulum work which was brought to a close in 1870. Professor F. R. Helmert, Director of the Central Bureau of the International Geodetic Association, to whose advice the India Office is much indebted, recommended the use of a half-seconds pendulum equipment as designed by Colonel von Sterneck. This equipment was ordered through the Geodetic Institute at Potsdam, and the constants for the necessary pressure and temperature corrections were determined there by Professor L. Haasemann, under Professor Helmert’s direction. A redetermination of these constants was made at Kew, at Professor Helmert’s suggestion, and results were obtained in very close accordance with those found at Potsdam. The apparatus gives only relative determinations of gravity; it was thus necessary to select a base station. As Kew Observatory had been the base station of the older Indian pendulum observations it was again selected, Dr. Glazebrook, Director of the National Physical Laboratory, having given permission and promised all necessary assistance. Meantime, a suggestion was made by the Astronomer Royal, and accepted by the Secretary of State for India, that the opportunity should be taken of swinging the pendulums also at Greenwich, thus allowing of a fresh intercomparison of g at Greenwich and Kew.

scholarly journals Accessibility Residence of Disabled People to the Health Unit

2019 ◽  
Vol 21 (3) ◽  
pp. 255
Author(s):  
Vagner Ferreira do Nascimento ◽  
Rosângela Aparecida Gonçalves ◽  
Walber Gineli de Jesus ◽  
Bianca Carvalho da Graça ◽  
Ana Cláudia Pereira Terças-Trettel ◽  
...  
Keyword(s):  
Social Inclusion ◽  
Family Health ◽  
Disabled Persons ◽  
Northern Region ◽  
Measuring Instruments ◽  
Health Unit ◽  
Mato Grosso ◽  
The Family ◽  
The Disabled ◽  
Made In

AbstractThe objective of the study was to know the accessibility of people with disabilities to the family health unit. This is an observational, descriptive study with a qualitative approach. Made in suburban neighborhoods in the largest municipality in the northern region of Mato Grosso. Data collection took place in March 2016, through an observation script and measuring instruments. The images were interpreted by iconographic analysis. It has been verified that the route of the residence of the disabled to the health unit, has many obstacles that can make the circulation unfeasible. This fact gives these people the tendency to lose their autonomy, since there will be the need of third parties help. Thus, they end up risking amid urban imperfections and irregularities and this trend to entail new possibilities of damages. They can also opt for other routes with fewer barriers, but more distant and dangerous. It is undeniable that the best way to reduce barriers is the movement of social inclusion, particularly in the planning of buildings and public mobility with greater accessibility, in the knowledge / reflection of the needs of the disabled person, support to families and articulation with the present social devices in the community. In addition, health professionals, especially nurses, play a key role in establishing links, so they can devise strategies to minimize such obstacles, while at the same time relieving moments of anguish and pain.Keywords: Health Services Accessibility. Disabled Persons. Architectural Accessibility.ResumoO objetivo do estudo foi conhecer a acessibilidade de pessoas com deficiência da residência à unidade de saúde da família. Trata-se de estudo observacional, descritivo e com abordagem qualitativa. Realizado em bairros de periferia no maior município da região médio norte de Mato Grosso. A coleta de dados ocorreu em março de 2016, mediante roteiro de observação e instrumentos de medição. As imagens foram interpretadas pela análise iconográfica. Verificou-se que o percurso da residência das pessoas com deficiência à unidade de saúde, possui muitos obstáculos que podem inviabilizar a circulação. Esse fato propicia à essas pessoas tendência a perder sua autonomia, visto que, haverá necessidade do auxílio de terceiros ajuda. Assim, acabam se arriscando em meio as imperfeições e irregularidades urbanísticas e isso tende a acarretar novas possibilidades de danos. Podem ainda, optar por outros trajetos com menos barreiras, porém mais distantes e perigosos. É inegável que a melhor forma de redução das barreiras seja o movimento de inclusão social, particularmente no planejamento de edificações e mobilidade pública com maior acessibilidade, no conhecimento/reflexão das necessidades da pessoa com deficiência, apoio às famílias e articulação com os dispositivos sociais presentes na comunidade. Além disso, o profissional de saúde, em especial os enfermeiros, possuem papel fundamental no estabelecimento de vínculos, logo podendo traçar estratégias para minimizar tais obstáculos, e ao mesmo tempo aliviar momentos de angústia e dor.Palavras-chave: Acesso aos Serviços de Saúde. Pessoas com Deficiência. Estruturas de Acesso.

scholarly journals Leonard Bairstow, 1880-1963

1965 ◽  
Vol 11 ◽  
pp. 22-40
Keyword(s):  
Wind Tunnel ◽  
National Physical Laboratory ◽  
Practical Applications ◽  
Aerodynamic Derivatives ◽  
Physical Laboratory ◽  
Engineering Department ◽  
Tunnel Design ◽  
Wide Experience ◽  
Wind Tunnel Design ◽  
Made In

Leonard Bairstow was born at Halifax in Yorkshire on 25 June 1880 and began his education in the elementary and secondary schools of Halifax. In 1898 he obtained a scholarship at the Royal College of Science, London, where he was a fellow student of H . E. Wimperis, who declared in later years: ‘I remember that, for several decades there, the most brilliant student that had been produced by the College was Professor Bairstow. He had an uncanny faculty of making himself acquainted with and making completely original suggestions on subjects which we did not think he knew anything about.' He became a Whitworth Scholar in 1902 and took prizes in mechanics and astrophysics. In 1904 he entered the Engineering Department of the National Physical Laboratory. There he worked under Dr T. E. (later Sir Thomas) Stanton on problem s of fatigue and of aerodynamics. In 1909 he was appointed to the staff of the new section of Aerodynamics (later called the Aerodynamics Division), of which he became the Assistant (or Principal) in charge. During this period he carried out some pioneer investigations into wind-tunnel design, and made important developments and practical applications of the theory of aircraft stability due to G. H. Bryan. This theory he illustrated by the use of small mica models of aircraft, and the necessary measurements of aerodynamic derivatives were made in the wind tunnel. In 1917 he was elected a Fellow of the Royal Society and made a G.B.E. Glazebrook had offered him the post of Superintendent of the Aerodynamics Department at the N.P.L. but Bairstow resigned and was appointed to the Air Board to work for Sir David Henderson on the design of aircraft and on aerodynamics research. There Bairstow worked at the Hotel Cecil as deputy to Alec Ogilvie and, with his wide experience, was able to co-ordinate the departmental work on structural strength, aerodynamics, performance and air screws.

XII.—Heusler's Magnetic Alloy

1907 ◽  
Vol 27 ◽  
pp. 88-92 ◽  
Author(s):  
Alexander D. Ross
Keyword(s):  
Preliminary Investigation ◽  
Magnetic Alloy ◽  
Physical Laboratory ◽  
Copper Manganese ◽  
Made In

Since the discovery by Heusler in 1903 of a magnetic alloy of copper, manganese, and aluminium, considerable interest has been aroused by the peculiarities of its properties and the difficulty of their explanation. In the summer of 1905 a preliminary investigation of a sample of the alloy was made in the Physical Laboratory of Glasgow University, and the results obtained have been published in a paper by Professor A. Gray.

The effect of load on the heat of shortening of muscle

1964 ◽  
Vol 159 (975) ◽  
pp. 297-318 ◽  
Keyword(s):  
Characteristic Equation ◽  
Simple Form ◽  
Linear Relation ◽  
Maximum Force ◽  
Energy Liberation ◽  
Constant Length ◽  
Extra Energy ◽  
Actual Load ◽  
Made In

During the process of shortening against a load a muscle liberates extra energy as work and as heat. The methods used in measuring the extra heat due to shortening have been critically examined and are described in some detail. The constant α of the heat of shortening depends on P , the load lifted, according to an average linear relation for frog sartorii at 0 °C, α / P 0 = 0·16( ± 0.015) + 0·18( ± 0·027) P / P 0 P 0 is the maximum force developed at constant length. The constant α of the heat of shortening can no longer be regarded as the same quantity as the constant α of the characteristic equation ( P + a ) v = b ( P 0 - P ), relating velocity ( v ) of shortening to load; but α / P 0 and a / P 0 , being always of the same order of size, are almost certainly connected in some way. The original (Hill 1938) conclusion that α and a were the same was probably due to a persistent error in the measurement of α , making it about 30% too great. In the original (Hill 1938) hypothesis the rate of extra energy liberation ( P + α ) v during shortening was taken to be proportional to ( P 0 - P ), i. e. to the gap between the maximum force a muscle could exert and the actual load it had to lift. In its simple form this idea must be abandoned; but a modification is suggested which still provides the characteristic equation and supplies a connexion between α and a . The assumptions made in calculating the heat of shortening are examined; to regard it simply as a change, produced by shortening, in the maintenance heat would make little difference. Further advances in the chemistry of contraction may allow the facts to be expressed in more concrete terms.

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