scholarly journals DRAWING TECHNOLOGIES OF NICHROME WIRE.

2019 ◽  
Vol 74 (06) ◽  
pp. 288-292
Author(s):  
e h ◽  
◽  
r a ◽  
l o ◽  
a o ◽  
...  
Keyword(s):  
Nichrome Wire

scholarly journals The Development of Physics Teaching Aids to Demonstrate the Intensity of Blackbody Radiation As a Function of Temperature

2019 ◽  
Vol 7 (1) ◽  
pp. 9-18
Author(s):  
Hartono Bancong ◽  
Ana Dhiqfaini Sultan ◽  
Subaer Subaer ◽  
Muris Muris
Keyword(s):  
Black Box ◽  
Absolute Temperature ◽  
Blackbody Radiation ◽  
Voltage Source ◽  
Physics Teaching ◽  
Free Inquiry ◽  
Nichrome Wire ◽  
Emit Radiation ◽  
Teaching Aids ◽  
The Law

The purpose of this study was to develop teaching aids of blackbody radiation experiment and practicum devices based on modified free inquiry which are valid and reliable. This teaching aids was designed to demonstrate the relationship between the intensity of radiation and the absolute temperature of a blackbody (the law of Stefan-Boltzmann). The principle of this experiments is the amount of current will flow from the voltage source and enter to the black box. The black box will absorb and emit radiation. There is a nichrome wire inside the black box that will be light up, heat and emit radiation when electrically flowed. The emitted heat will be measured by temperature sensors using thermocouple located outside the black box. Based on experts and practitioner evaluation, the developed teaching aids of blackbody radiation experiment and practicum devices based on modified free inquiry were found to be valid, and reliable. The results of the experiment showed that the intensity of blackbody radiation was directly proportional to its temperature. This result is consistent with the law of Stefan-Boltzmann. Furthermore, the average of students’ perception of the developed teaching aids and practicum devices of blackbody radiation are 74.92% (good) and 80.17% (very good) respectively. This indicates that the teaching aids and practicum devices that have been developed can be used to demonstrate and prove the modern physics concepts related to blackbody radiation.Keywords: Teaching Aids, Stefan-Boltzmann’s law, Blackbody RadiationPenelitian ini bertujuan untuk mengembangan alat peraga eksperimen radiasi benda hitam dan perangkat praktikum fisika berbasis modified free inquiry yang valid dan reliabel. Alat peraga tersebut dirancang untuk mendemonstrasikan hubungan antara intensitas radiasi benda hitam dengan suhu mutlak yang dipancarkannya (Hukum Stefan-Boltzmann). Prinsip kerja dari alat peraga tersebut adalah arus akan mengalir dari sumber tegangan dan masuk ke dalam kotak lubang hitam. Kotak ini berfungsi untuk menyerap dan memancarkan radiasi. Di dalam kotak terdapat kawat nicrom yang akan menyala  dan memancarkan radiasi ketika dialiri arus listrik. Panas yang dipancarkan akan diukur oleh termokopel radiasi yang berada di luar kotak. Berdasarkan penilaian validator, alat peraga eksperimen radiasi benda hitam dan perangkat praktikum fisika berbasis modified free inquiry yang telah dikembangkan dinyatakan valid dan reliabel. Hasil uji coba menunjukkan bahwa intensitas radiasi yang dipancarkan oleh benda hitam berbanding lurus dengan temperaturnya yang sesuai dengan hukum Stefan-Boltzmann. Selanjutnya, rata-rata persepsi praktikan terhadap alat peraga eksperimen radiasi benda hitam dan perangkat praktikum yang telah dikembangkan secara berturut-turut adalah 74,92% (baik) dan 80,17% (sangat baik). Hal ini mengindikasikan bahwa alat peraga dan perangkat praktikum yang telah dikembangkan dapat digunakan untuk mendemonstrasikan dan membuktikan konsep-konsep fisika modern yang berhubungan dengan radiasi benda hitam.Kata kunci: Alat Peraga, Hukum Stefan-Boltzmann, Radiasi Benda Hitam

scholarly journals The sorption of hydrogen on copper. Part II.—The rate of solution

1931 ◽  
Vol 133 (822) ◽  
pp. 522-535 ◽  
Keyword(s):  
Room Temperature ◽  
Thermal Capacity ◽  
Mercury Surface ◽  
Nichrome Wire ◽  
Boiling Points ◽  
Spark Gap ◽  
Capillary Tubing ◽  
Alumel Thermocouple ◽  
Adsorption Of Gases ◽  
Iron Tube

Before attention was directed to the adsorption of gases on the surfaces of solids much work was done on the “occlusion” at higher temperatures. Above 400° C. solution usually occurs rapidly, and because of the decrease in surface by sintering, the adsorption is negligible compared with the absorption. In this paper, investigations on the sorption of hydrogen on copper are described at temperatures intermediate between 25° C. when adsorption is the principal phenomenon and 200° C. when solution has become important. Over this range of temperature both adsorption and absorption have been measured. On bringing the hydrogen into contact with the copper there was always an immediate fall in pressure attributable to adsorption, followed by a slower fall as absorption proceeded. This latter process, of course, became quicker at higher temperatures. Experimental . Apparatus .—The apparatus used was almost exactly the same as that described in the previous paper. The only difference was that instead of the thermostat at 25° C. a furnace was used. A copper tube about 50 cm. long and 5 cm. in diameter, wound with nichrome wire, had placed inside it, for half its length, a tightly fitting iron tube with thick walls (1 cm.). The adsorption bulb went into this half, and the low conductivity and large thermal capacity of the iron hindered fluctuations in temperature from reaching the bulb. In the lower half of the furnace, where the absence of the iron tube allowed the temperature to vary promptly with a changed heating current, was a thermoregulator bulb containing air, connected by capillary tubing to a U-tube in which mercury made contact with a tungsten point. On the other side of the U-tube a system of the same volume, with a bulb immersed in a thermostat, counteracted the effect of alterations of room temperature. An extra U-tube of mercury enclosed nitrogen around the spark gap to prevent dirtying the mercury surface by oxidation. With this arrangement the temperature could be kept constant to within half a degree for any length of time. Temperatures were measured by a chromel-alumel thermocouple calibrated at the boiling points of suitable liquids.

scholarly journals Impact of Holder Materials on the Heating and Explosive Breakup of Two-Component Droplets

Energies ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 3307 ◽  
Author(s):  
Dmitry Antonov ◽  
Jérôme Bellettre ◽  
Dominique Tarlet ◽  
Patrizio Massoli ◽  
Olga Vysokomornaya ◽  
...  
Keyword(s):  
Heating Time ◽  
Droplet Breakup ◽  
Flue Gases ◽  
Boiling Temperature ◽  
Temperature Minimum ◽  
Heating Chamber ◽  
Nichrome Wire ◽  
Two Component ◽  
Integral Characteristics ◽  
Heat Carriers

The heating of two-component droplets and the following explosive breakup of those droplets have been extensively studied over the most recent years. These processes are of high interest, since they can significantly improve the performance of many technologies in fuel ignition, thermal and flame liquid treatment, heat carriers based on flue gases, vapors and water droplets, etc. Research throughout the world involves various schemes of droplet heating and supply (or, less frequently, injection) to heating chambers. The most popular scheme features the introduction of a two-component or multi-component droplet onto a holder into the heating chamber. In this research, we study how holder materials affect the conditions and integral characteristics of droplet heating and explosive breakup: heating time until boiling temperature; minimum temperature sufficient for droplet breakup; number and size of fragments in the resulting droplet aerosol, etc. Experiments involve droplets that are produced from flammable (oil) and non-flammable (water) components with significantly different thermophysical and optical properties, as well as boiling temperature and heat of vaporization. The most popular elements with the scientific community, such as ceramic, steel, aluminum, copper, and phosphorus rods, as well as a nichrome wire, serve as holders. We establish the roles of energy inflow from a holder to a droplet, and energy outflow in the opposite direction. We compare the holder results with a supporting thermocouple, recording the drop temperature under a heat transfer provided at 350°C. Finally, we forecast the conditions that are required for a significant improvement in the performance of thermal and flame water treatment through the explosive breakup of two-component droplets.

scholarly journals The fine-structure of some lines in the visible region of the spectrum of thallium III

1930 ◽  
Vol 129 (809) ◽  
pp. 43-47 ◽  
Keyword(s):  
Fine Structure ◽  
Visible Region ◽  
Nuclear Moment ◽  
Nichrome Wire ◽  
Spark Gap ◽  
High Tension ◽  
In Series ◽  
The One ◽  
Theoretical Results ◽  
Line Classification

From a study of the fine-structure of some lines in the arc spectrum of thallium Schüler and Brück concluded that the nucleus of the thallium atom possessed a moment of momentum given by ½ h /2π and this value was confirmed by work on the first spark spectrum of the element. The value of the nuclear moment being known the structure of the lines in the second spark spectrum could be predicted and the present paper is the account of an investigation of a number of these lines which lie in the visible region, a comparison being drawn between the experimental and the theoretical results. The source of light used was similar to the one employed by McLennan, McLay and Crawford in the excitation of the first and second spark spectra of thallium for the purpose of line classification. It consisted of a quartz tube about 50 cm. long and 1½ cm. in diameter with a plain window in each end and provided with aluminium electrodes sealed into side tubes. The metal whose spectrum was to be studied was scattered along thé bottom of the tube and the tube evacuated. The metal was then vaporised by hear supplied by a coil of nichrome wire wound on the tube. This coil must be wound non-inductively or the desired excitation will not be obtained. The high tension across the terminals was produced by joining them in series with the secondary of a 30,000-volt transformer and a spark gap of about 1 c. m., a condenser being connected in parallel.

Semiquantitative determination of ten vitamins by the nichrome wire ring chamber

1969 ◽  
Vol 57 (2) ◽  
pp. 244-252 ◽  
Author(s):  
Manzur-ul-Haque Hashmi ◽  
N. A. Chughtai ◽  
Maqbool Ahmad Shahid
Keyword(s):  
Nichrome Wire ◽  
Semiquantitative Determination

Analysis of ores by simple grinding and circular thin-layer chromatography and the nichrome wire ring chamber

1969 ◽  
Vol 57 (2) ◽  
pp. 286-289 ◽  
Author(s):  
Manzur-ul-Haque Hashmi ◽  
Gul Akhtar Minhas ◽  
Mohammad Iqbal Durrani ◽  
Riaz-ur-Rehman
Keyword(s):  
Thin Layer ◽  
Thin Layer Chromatography ◽  
Nichrome Wire ◽  
Layer Chromatography

scholarly journals New Volume Change Mechanism Using Metal Bellows for Buoyancy Control Device of Underwater Robots

ISRN Robotics ◽  
2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Koji Shibuya ◽  
Sho Yoshii
Keyword(s):  
Phase Change ◽  
Volume Change ◽  
Control Method ◽  
Control Device ◽  
Paraffin Wax ◽  
Underwater Robots ◽  
Nichrome Wire ◽  
Change Mechanism ◽  
Metal Bellows ◽  
Buoyancy Control

We propose a new volume change mechanism using a metal bellows for a buoyancy control device of underwater robots and vehicles. Our proposed buoyancy control method utilizes the volume change caused by the phase-change of materials. We chose paraffin wax as a phase-change material because its volume change exceeds other candidates. Our proposed device consists of a metal bellows and an aluminum housing that contains paraffin wax and water. The paraffin wax is heated and cooled by a nichrome wire and a peltier device. We conducted two experiments and confirmed that the heat sink in the aluminum housing increases the speed of the buoyancy change and that the thickness of the air layer is crucial for efficient insulating. Then, we built a prototype robot with the four devices and confirmed that the robot can change its buoyancy up to its maximum value.

Theoretical and Experimental Investigation of Indoor Flying Models

1964 ◽  
Vol 68 (647) ◽  
pp. 728-734
Author(s):  
Max Hacklinger
Keyword(s):  
Flow Characteristics ◽  
Aerodynamic Characteristics ◽  
Light Weight ◽  
Flight Performance ◽  
Wing Loading ◽  
Balsa Wood ◽  
Special Model ◽  
Nichrome Wire ◽  
Horizontal Flight ◽  
Theory And Experiment

SummaryThe development of a special model aeroplane technique is reviewed which renders possible easy and illustrative experimenting In the Reynolds number regime from 1 to 5000. The models are built in extremely light-weight construction; with wing span from 0·1 to 1 metre and all-up weights from 0·01 to 2 grammes, flight velocities between 0·1 and 1 m/ sec are reached. The requirement of extremely low wing loading, together with the special air flow characteristics in this region, leads to rather unconventional construction principles with the materials balsa wood, nichrome wire and cellulose film. These principles are reviewed briefly. The problem of optimum propulsion for such model aeroplanes is treated analytically. Some results are given for flight performance optimisation. By combining theory and experiment there has been evolved, e.g. the Schwebeleistungs method (power required for horizontal flight) for optimising the duration of indoor model aeroplanes without exact knowledge of their aerodynamic characteristics. Flight characteristics with some elasticity of the structure present formidable problems and are reviewed in some examples. Finally, some problems of hangar meteorology are mentioned.

Microidentification of twenty anions by the nichrome wire ring chamber

1968 ◽  
Vol 56 (6) ◽  
pp. 1237-1243
Author(s):  
M. H. Hasbmi ◽  
N. A. Chughtai ◽  
Maqbool Ahmad Shahid
Keyword(s):  
Nichrome Wire
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