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Online since: November 2015
Authors: Dawid Wojtecki, Stanisław Legutko, Jolanta B. Krolczyk
The effectiveness of a CMMS depends on how well the software accomplishes this integration, the acceptance of the user community, and the quality of the maintenance data loaded into the CMMS [14].
The ability to collect and store data concerning all activities of the maintenance, supervision and repair of machinery and equipment. 2.
Data collection and settlement of maintenance and repair costs using a special statistical reporting, according to the places of their origin (contractor and a services customer) and their types. 5.
Collection and control of basic data, especially: places of cost creation, materials, workplaces, means of production.
The offer of choice of software does not mention the problems with implementations in companies, but the software is constantly improved, which means that data from several years ago may already be out of date.
Online since: January 2019
Authors: Nakuntwalai Wisidsri, Pattaranut Eakwaropas
The testing extracts were evaluated the effect on fibroblast cell viability using resazurin reduction assay.
Meanwhile, C and E extract induced cytotoxicity on NIH 3T3 cells by reduction of cell viability.
The cell viability was determined by resazurin (Sigma-Aldrich, USA) reduction assay, whereby the cells were incubated for 4 h at 37°C in 100 µl fresh DMEM containing 50 µg/ml resazurin.
The statistical data were expressed as mean ± SEM.
Effect of J. sambac flower extracted on cell viability The cell viability of the NIH 3T3 fibroblast cells was assessed by resazurin reduction assay.
Online since: May 2020
Authors: A. V. Nikanorov
Introduction The crisis in the silver mining complex in Russia led to the reduction in primary silver production by more than a third since 1992 to 2002.
According to the proposed technology, the process of crude silver and gold alloy synthesis has two main operations: oxidation-reduction baking of the concentrate and electrical smelting of the cinder with sodium carbonate as flux.
Silver synthesis from bakes concentrates is based on the property of lead and copper to collect precious metals in oxidation-reduction smelting of cinder with fluxes [11].
Smelting of crude silver and gold alloy is performed in an ore-thermal furnace at the temperature of 1200-1300 0С in the electric slag regime that creates conducive conditions for reduction and separation processes.
The data in Table 1 show that in one technological operation it is possible, depending on the conditions of the experiment, to get silver-containing matte or polymetallic alloy with silver extraction rate of 95-98%.
Online since: November 2020
Authors: Ilya Gavrilin
In this case, the liquid metal serves as an electrode for the reduction of ions containing Ge to germanium in the atomic state, with their subsequent dissolution and the formation of a melt of eutectic composition.
A continuous cathodic reduction reaction provides concentration supersaturation of the melt with germanium, resulting in crystallization of Ge in the melt at the interface with the substrate.
In addition, the temperature of the electrolyte solution may affect the rate of the electrochemical reduction reaction of ions containing Ge.
The first step on the curve (1-GeNWs growth) is responsible for the electrochemical reduction of Ge-containing ions, that is, for the growth of Ge nanowires, the appearance of a black film is visually observed.
Based on the data obtained, it was found that the arrays of GeNW obtained at an electrolyte solution temperature of 20°C and 90°C contain Ge, O and In atoms (Fig.5a, b).
Online since: June 2008
Authors: Qi Wang, Zhi Gang Feng, K. Shida
Measurement uncertainty, termed validated uncertainty (VU) is one such indicator, in addition to validated measurement value (VMV) and measurement value status (MVS) obtained from sensor localized fault detection, isolation and data recovery.
(1) FDIR (100 days): fault mode )1( f is FDIR as healthy at 100 days, corresponding to a reduction in validated uncertainty.
This is also reflected in the reduction in )100( )1( 0 + P of Fig 2.
This reduction is depending on the efficiency of validation ( )1()1( ,cα ) and the prior probability of faulty modal operation: )100( )1( 0 − P . (2) Maintenance (200 days): maintenance intervention at 200 days resets all fault modes with 99.99% efficiency, resulting in a large reduction in VU and significant a reduction in the probability of fault for all fault modes. (3) FDIR (300 days): fault mode )2( f is FDIR as faulty at 300 days and increase in measurement VU reflects the diagnosis.
Online since: July 2010
Authors: Duangduen Atong, Supawan Vichaphund
After reduction process, the crystalline phases of membrane were investigated by using X-ray diffraction (XRD; model JEOL, JDX-3530).
Each of the data represented an average of measurements at least 5-10 tests.
Fig. 1 XRD patterns of 10, 20, 40wt% Ni/Al2O3 membranes sintered at 1400°C for 4h with and without CIP: (a) after sintering; (b) after reduction by H2 Fig. 1 exhibits XRD patterns of Ni/Al2O3 membranes with 10, 20, 40 wt% Ni content sintered at 1400°C for 4h.
It was found that membranes compacted with and without CIP showed no difference in phases after sintering and reduction processes.
For XRD analysis, membranes compacted with and without CIP showed no difference in phases after reduction process at 900°C; the membranes contained Al2O3 and Ni with small amount of nickel aluminum oxide.
Online since: January 2012
Authors: Natt Makul, Gritsada Sua-Iam
However, most of HSPs also encounter with a significant problem of absolute volume reduction of hydration products at early stage or “chemical shrinkage” and consequent self-desiccation taking place after initial setting or “autogenous shrinkage”.
Nowadays, there is a lot of research data has been published regarding its effect on cement-based materials.
Specimen preparation and testing procedures Early-age shrinkage of the OPC and RHA pastes were tested for internal volumetric reduction at 23 oC ± 2 oC and atmospheric pressure in accordance with ASTM C1608 [7].
A modified apparatus for measuring the volumetric reduction of samples is shown in Fig. 3.
Results and discussion Effect of superplasticizer type The measured volumetric reduction (shrinkage) at first 72-hours hydration of OPC paste mixtures is displayed in Fig. 4.
Online since: October 2020
Authors: Michaela Kostelecká, Šárka Nenadálová, Lukáš Balík, Lucie Kudrnáčová
As in other fields also in this area the technology of additional humidity reduction underwent significant progress during last decennaries and both new invasive and non-invasive methods are being developed.
It is good to be aware of few basic facts: 1) humidity in buildings and mainly bottom parts of loadbearing walls is a long term process and no immediate and final effect can be expected from any solution; 2) existing technologies cannot perfectly dry up historic buildings, it is always only reduction of humidity; 3) each building must be assessed to what degree it is damaged by the existing and long-term humidity condition and to what extent it is desirable to change such situation; 4) solution of unwanted humidity in historic buildings is always a compromise between more or less invasive technical intervention in the building and an effort to maintain cultural heritage, i.e. cultural values of the building and from this aspect is often limited the theoretically achievable efficiency of the redevelopment measure; 5) building redevelopment from the aspect of humidity can be divided in two parts, leading to a) elimination of humidity sources and b) organizing of gradual long-term
Tab 4: Calculation of time of brickwork humidity reduction to required 5 % of weight in the depth of 100 mm Tab 5: Calculation of time of brickwork humidity reduction protected with 18 mm lime plaster to required 5 % of weight for various thickness of walls The following example of cellar rooms (fig. 1) is showing calculation of speed air saturation with water vapours from humid brickwork.
Table 6 is following from data stated in the table 3 and is expressing speed of saturation of 1 kg of air of cellar rooms per hour for individual rooms and for the whole cellar as a unit. 2 3 1 Fig 1: Layout of the cellar used for calculation of speed of natural humidity evaporation from walls Tab 6: Calculation of speed of hourly air saturation by humidity evaporating from brickwork based on individual finishes/surface treatments Practical calculation made on real example of cellar rooms is proving the fact that process of natural spontaneous evaporation of residual structural humidity from walls is significantly increasing internal both specific and relative air humidity in orders of units to hundredths of grams of water vapour per hour, resp. tenth to units of grams per second per kg.
In practice, this means that in structures with a surface treatment, we can expect a reduction in the rate of the evaporation process, ideally by 74% compared to the rate of evaporation from plain brickwork.
Online since: May 2011
Authors: Tae Soo Kim, Jin Seong Lim
However, curling occurred for specimens with relatively thin-walled steel plate (1.5mm or 3.0mm) and a long end distance and the curling caused a strength reduction in bolted connections.
Proposed equations by Kuwamura et al. tended to overestimate ultimate strength of bolted connections due to no sufficient consideration of strength reduction by curling.
Also, strength reduction phenomenon by curling was observed in load-displacement curves of FEA results as depicted in Fig.5 like test results(Fig.2).
Ultimate strength, fracture mode, curling occurrence and strength reduction by curling predicted from FEA with recommended modelling method showed a good correspondence to those of test results.
Authors express their thanks to Steel Structure Lab. of The University of Tokyo for supplying the experimental data.
Online since: July 2015
Authors: Mohd Imran Ghazali, Izzuddin Bin Zaman, Maznan Bin Ismon
Although most industrial practice are still rely on the vibration spectral data analysis as a primary tools for assessing machine condition, both techniques have been established to have their unique advantages and disadvantages associated with the monitoring and fault diagnosis of machinery.
Worm gearbox normally consists of one step speed reduction mechanism but capable for higher reduction ratio.
Since the vibration analysis could predict the gear failure effectively, the application need to be extend to the output shaft of worm gearboxes which typically has great speed reduction compared to the input shaft.
The reduction ratio of the gearbox is 1:60 as the worm gear is located above the sixty teeth worm wheel.
Swarnamani, Experimental studies on the effect of reduction in gear tooth stiffness and lubricant film thickness in a spur geared system, Tribology International 42 (2009) 340-352
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