Importance of load cell sensitivity in determination of the load dependence of hardness in recording microhardness tests

1991 ◽  
Vol 26 (24) ◽  
pp. 6576-6580 ◽  
Author(s):  
W. Mason ◽  
P. F. Johnson ◽  
J. R. Varner
Keyword(s):  
Load Cell ◽  
Cell Sensitivity ◽  
Load Dependence

Determination of the Load-Independent Hardness by Analyzing the Peak-Load-Dependence of the Unloading Slope in Nanoindentation

2007 ◽  
Vol 280-283 ◽  
pp. 1761-1764 ◽  
Author(s):  
Jiang Hong Gong
Keyword(s):  
Peak Load ◽  
Soda Lime ◽  
Test Material ◽  
Soda Lime Glass ◽  
Berkovich Indenter ◽  
Tetragonal Zro2 ◽  
Load Dependence ◽  
Straight Line ◽  
Unloading Stiffness

By assuming that the test material has a load-independent nanohardness number, a linear relationship was predicted to exist between the reciprocal of the initial unloading stiffness, 1/SM, and the inverse square root of the peak load, (1/Pmax)0.5, and the load-independent hardness can be obtained directly from the slope of the 1/SM−(1/Pmax)0.5 straight line. This prediction was then verified by analyzing the experimental data obtained on soda-lime glass and a tetragonal ZrO2 polycrystalline. The indenter area function established based on the resultant load-independent hardness was found to deviate from the perfect Berkovich indenter and such a deviation can be attributed to the indenter deformation occurring during indentation as well as the indenter tip rounding.

The Determination of HF, HCl, SiF4, and HCF3 in WF6 Gas

1974 ◽  
Vol 28 (2) ◽  
pp. 139-142 ◽  
Author(s):  
C. L. Chaney ◽  
J. Chin
Keyword(s):  
Infrared Absorption ◽  
Gas Absorption ◽  
Absorption Method ◽  
Absorption Cell ◽  
Cell Sensitivity ◽  
Gas Sampling ◽  
Calibration Curves

An infrared absorption method in the 1- to 15-µ range has been developed for determining HF, HCl, HCF3, and SiF4 in WF6, gas. Because of the reactivity and corrosiveness of WF6, a special gas absorption cell and gas-sampling apparatus were designed and built. Calibration curves were generated for a 10-cm cell. Sensitivity values were 100 wppm for HF and HCl, and 10 wppm for HCF3 and SiF4.

Determination of body density by the hydrostatic weighting: Dynamometer versus load cell

2009 ◽  
Author(s):  
Carlos M. P. Cursino ◽  
Raimundo C. S. Freire ◽  
Joao B. A. Silva ◽  
Enilson J. L. Costa ◽  
Sebastian Y. Catunda ◽  
...  
Keyword(s):  
Load Cell ◽  
Body Density

scholarly journals LISÍMETROS DE PESAGEM PARA MEDIDAS DE EVAPOTRANSPIRAÇÃO EM ESTUFA

Irriga ◽  
2017 ◽  
Vol 22 (4) ◽  
pp. 715-722
Author(s):  
Izabela Paiva Martins ◽  
Rogério Teixeira De Faria ◽  
Luiz Fabiano Palaretti ◽  
Alexandre Barcellos Dalri ◽  
Carolina Oliverio ◽  
...  
Keyword(s):  
Water Balance ◽  
Storage System ◽  
Absolute Error ◽  
Load Cell ◽  
Calibration Data ◽  
Mass Variation ◽  
Water Balance Components ◽  
E Mail

LISÍMETROS DE PESAGEM PARA MEDIDAS DE EVAPOTRANSPIRAÇÃO EM ESTUFA  IZABELA PAIVA MARTINS; ROGÉRIO TEIXEIRA DE FARIA; LUIZ FABIANO PALARETTI; ALEXANDRE BARCELLOS DALRI; CAROLINA OLIVERIO E LUIS GUILHERME POLIZEL LIBARDI Departamento de Engenharia Rural, Universidade Estadual Paulista - Campus Jaboticabal, Via de Acesso Professor Paulo Donato Castelane, Vila Industrial, Jaboticabal, Sp, Brasil. E-mail: [email protected], [email protected], [email protected], [email protected], [email protected], [email protected].   1 RESUMO Lisímetros de pesagem são utilizados com a finalidade de determinar os componentes do balanço hídrico, particularmente a evapotranspiração e a evaporação. Dentre as inúmeras metodologias, esta apresenta maior precisão, porém, para a obtenção de dados confiáveis, sua calibração deve ser executada in situ. Esse trabalho objetivou calibrar 12 lisímetros de pesagem, verificar a presença de linearidade e histerese das medidas, e avaliar a precisão dos equipamentos. Os lisímetros apresentavam diâmetro e profundidade de 30 cm, com uma célula de carga em cada lisímetro para a determinação da variação de massa, acoplada a um sistema de aquisição e armazenamento de dados. A calibração foi realizada comparando-se a adição e remoção de pesos com massa conhecida (em kg) com a leitura da célula de carga (em mV). Os dados de calibração foram lineares, apresentando correlação significativa da massa em resposta a voltagem. Os coeficientes angular e linear variaram de 762,78 a 1187,8 kg mV-1 e -444,99 a -798,00 kg, respectivamente. O erro absoluto variou de 0,03 a 0,54, mostrando alta precisão dos lisímetros. A precisão constatada na obtenção da variação da massa foi de 0,79 mm, com o índice de concordância de Willmott foi de 0,99, mostrando a concordância entre os valores estimados e os observados. Conclui-se que os lisímetros são adequados para a determinação da evapotranspiração de cultivo. Palavras-chave: lisimetria, célula de carga, balanço hídrico  MARTINS, I. P.; FARIA, R. T. de; PALARETTI, L. F.; DALRI, A. B.; OLIVERIO, C.; LIBARDI, L. G. P.WEIGHING LYSIMETERS FOR GREENHOUSE EVAPOTRASPIRATION MEASUREMENTS  2 ABSTRACT Weighing lysimeters are used for the purpose of determining water balance components, especially for evapotranspiration and evaporation. Within all know methods, lysimeter is considered the most accurate, but in order to obtain reliable data, their calibration must be performed in situ. The objective of this work was to calibrate 12 lysimeters to verify measurements’ linearity and the existence of hysteresis, besides evaluating the equipment's accuracy. The lysimeters had diameter and depth of 30 cm, with one load cell in each lysimeter for determination of mass variation,  connected to a data acquisition and storage system. The calibration was performed by comparing the load and unload know mass (kg) with the load cell reading (mV). The calibration data were linear, presenting a significant mass correlation in response to voltage. The angular and linear coefficients varied from 762.78 to 1187.8 kg mV-1 and -499.99 to -798.00 kg, respectively. The absolute error ranged from 0.03 to 0.54, showing a high accuracy of the lysimeters. The accuracy for mass variation was 0.79 mm and the Willmott concordance index was 0.99, showing the good agreement between the estimated and observed values. It can be concluded that lysimeters are suitable for crop evapotranspiration determination. Keywords: lisimetry, load cell, water balance 

scholarly journals PARAMETER DETERMINATION OF HYDRAULIC DYNAMOMETER

2020 ◽  
Vol 5 (2) ◽  
pp. 137-147
Author(s):  
Mohammad Ayub Khan ◽  
Suraj Singh ◽  
Om ◽  
Gunjan Gupta ◽  
Avanish Yadav
Keyword(s):  
Temperature Sensors ◽  
Load Cell ◽  
Parameter Determination ◽  
Inlet Temperature ◽  
Outlet Temperature ◽  
Programming Tool ◽  
Set Up ◽  
Determination Of Parameters ◽  
Temperature Water

The project is basically based upon the determination of parameters of Hydraulic Dynamometer using LabVIEW. LabVIEW is the programming tool that is used for automation purposes mainly in industries. Herein, we will be judging the various parameters like Load Cell, Temperature Sensors etc, by interfacing the digital set-up with our manual set-up. The Load Cell that will be used is the S-shaped Load Cell and the various temperature sensors are used to determine temperatures like water inlet temperature, water outlet temperature, air temperature etc. After measuring these parameters we will be interfacing these devices with the manual dynamometer system. After interfacing, there will be separate meters installed wherein we will be view parameters measured by the system. The study that was conducted resulted in following results that are mentioned in the graphs and tables below. We have tried to mention more and more tables and graphs related to our study so that it can be possible to figure out the exact motive behind the research conducted.

scholarly journals Perangkat Penentu Kualitas Beras Ditinjau dari Kadar Air dan Berat Butir Menir Berbasis Arduino Uno

2019 ◽  
Vol 4 (1) ◽  
pp. 39-48
Author(s):  
Mustofah Mustofah ◽  
Pipit Utami
Keyword(s):  
Soil Moisture ◽  
Load Cell ◽  
Rice Quality ◽  
Moisture Sensor ◽  
Air Content ◽  
Soil Moisture Sensor ◽  
Testing Tools ◽  
Arduino Uno

Determining the quality of rice is something that must be done to maintain the quality of rice produced by farmers. Quality determinants used for this process can be relied on for rice properly and efficiently. Determination of air content using soil moisture sensor yl-69 and determination of grain weight using a load cell sensor that emits with an Arduino UNO microcontroller as a device controller device. System making method consists of needs, analytic requirements, block diagrams, system design, manufacturing tools, testing tools and tools. The test results show that the determinant of rice quality in terms of good air and weight with errors in the readings of soil moisture sensor yl-69 is 1.522% and the error in load cell reading is 0.431%. The performance of this rice quality assessment device shows that the device can function properly in terms of the sensor's working measurement, the device for determining rice quality and the performance of all components in the device can run well.

Galactic orbits of stars

1966 ◽  
Vol 25 ◽  
pp. 93-97
Author(s):  
Richard Woolley
Keyword(s):  
Globular Cluster ◽  
Potential Field ◽  
High Velocity ◽  
Velocity Vector ◽  
Variable Stars ◽  
The Sun ◽  
Proper Motions ◽  
Rr Lyrae ◽  
The Galaxy

It is now possible to determine proper motions of high-velocity objects in such a way as to obtain with some accuracy the velocity vector relevant to the Sun. If a potential field of the Galaxy is assumed, one can compute an actual orbit. A determination of the velocity of the globular clusterωCentauri has recently been completed at Greenwich, and it is found that the orbit is strongly retrograde in the Galaxy. Similar calculations may be made, though with less certainty, in the case of RR Lyrae variable stars.

Distance to SN 1987A and the LMC

1999 ◽  
Vol 190 ◽  
pp. 549-554
Author(s):  
Nino Panagia
Keyword(s):  
Angular Size ◽  
Large Magellanic Cloud ◽  
Magellanic Cloud ◽  
Light Curves ◽  
Distance Modulus ◽  
Absolute Size ◽  
Sn 1987A

Using the new reductions of the IUE light curves by Sonneborn et al. (1997) and an extensive set of HST images of SN 1987A we have repeated and improved Panagia et al. (1991) analysis to obtain a better determination of the distance to the supernova. In this way we have derived an absolute size of the ringRabs= (6.23 ± 0.08) x 1017cm and an angular sizeR″ = 808 ± 17 mas, which give a distance to the supernovad(SN1987A) = 51.4 ± 1.2 kpc and a distance modulusm–M(SN1987A) = 18.55 ± 0.05. Allowing for a displacement of SN 1987A position relative to the LMC center, the distance to the barycenter of the Large Magellanic Cloud is also estimated to bed(LMC) = 52.0±1.3 kpc, which corresponds to a distance modulus ofm–M(LMC) = 18.58±0.05.

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