scholarly journals ПОЛІМЕР-ПОЛІМЕРНИЙ КОМПОЗИТ НА ОСНОВІ ВІДХОДІВ ЗШИТОГО ЕТИЛЕНВІНІЛАЦЕТАТУ

2019 ◽  
Vol 128 (6) ◽  
pp. 64-70
Author(s):  
Б. П. Савчук ◽  
Б. М. Савченко ◽  
Н. В. Сова ◽  
І. М. Костюк
Keyword(s):  
Mechanical Properties ◽  
Melting Point ◽  
Polymer Composite ◽  
Constant Pressure ◽  
Capillary Viscometer ◽  
Hydrostatic Weighing ◽  
Weighing Method ◽  
Hydrostatic Weighing Method

Development of technology for the processing of cross liked EVA waste, followed by the use of polymer / polymer composite PVC / EVA as a filler. Method. The determination of the MFI was carried out in accordance with ISO 1133: 1997 on a capillary viscometer of constant pressure at a temperature of (190 ± 0,5) ° С and a weight of 2,16 kg. The thermostability  and  melting  point  are  determined  using  the  RM-200C  Hapro  rheometer  plastograph.  The mechanical properties were determined on a bursting machine according to the ASTM D638. Hardness - using  a  hard-gauge  with  a  Shore-D  scale,  the  density  by  hydrostatic  weighing  method  on  the  analytical scales RADWAG AS-X2.

Error determination of hidden flows by hydrostatic weighing in parts obtained by casting

2020 ◽  
pp. 339-342
Author(s):  
M.S. Razumov ◽  
P.V. Glazkov ◽  
V.S. Kochergin ◽  
A.S. Byshkin
Keyword(s):  
Theoretical Calculations ◽  
Casting Defects ◽  
Casting Method ◽  
Error Determination ◽  
Hydrostatic Weighing ◽  
Weighing Method ◽  
Hydrostatic Weighing Method

The existing methods for detecting of casting defects and their disadvantages are considered. Hydrostatic weighing method is proposed for detecting of hidden fl aws by comparing the reference and calculated densities of the casting, method for calculating of the error is recommended. The adequacy of theoretical calculations is verifi ed experimentally

scholarly journals ПОЛІМЕР-ПОЛІМЕРНИЙ КОМПОЗИТ ОТРИМАНИЙ ШЛЯХОМ ПЕРЕРОБКИ ВІДХОДІВ ПВХ ЛІНОЛЕУМУ

2018 ◽  
Vol 122 (3) ◽  
pp. 45-51
Author(s):  
І. М. Костюк ◽  
Н. В. Сова ◽  
Б. М. Савченко ◽  
Р. Ш. Іскандаров ◽  
Б. П. Савчук
Keyword(s):  
Mechanical Properties ◽  
Physical And Mechanical Properties ◽  
Capillary Viscometer ◽  
Pet Waste ◽  
Waste Production ◽  
Hydrostatic Weighing ◽  
Mixed Waste ◽  
First Time ◽  
Positive Effect

Development of technology for the processing of mixed waste of vinyl flooring by their joint milling and plasticization. The determination of the MFI was carried out according to ISO 1133: 1997 on a capillary viscometer with a constant pressure and temperature (190 ± 0.5) ° C and a weight of 2.16 kg. The thermostability and melting temperature were determined on the Hipro RM 200C plastograph. Mechanical properties were determined on a breaking machine according to ASTM D638. Hardness - using a Shore D durometer, hydrostatic weighing density on an analytical balance RADWAG AS-X2. Equipment for milling and plasticization of a mixture of PVC / PET waste was selected. Qualitative milling of mixed waste is achieved by using a low speed rotary knife grinder with rotor speed of 300 rpm. The properties of the reinforced PVC were obtained. The strength of this film compared with the classic recipe is lower but when by using such materials in the composition it is possible to obtain a material with high physical and mechanical properties and achieve maximum non-waste production which will also have a positive effect on the economy of the enterprise. The technology for joint processing of mixed vinyl flooring waste was developed for the first time. The features of reinforcing PVC matrix with fibers of a PET was obtained at the receipt of films from mixed vinyl flooring waste. The developed technology allows to provide non-waste production of vinyl flooring at enterprises.

scholarly journals Acurácia de índices alternativos para avaliar o estado nutricional de homens e mulheres

2017 ◽  
Vol 19 (3) ◽  
pp. 290
Author(s):  
Guilherme Adroaldo Moraes Pereira ◽  
Silvana Corrêa Matheus ◽  
Diego Rodrigo Both ◽  
Mauri Schwanck Behenck
Keyword(s):  
Nutritional Status ◽  
Fat Mass ◽  
Good Accuracy ◽  
Reference Method ◽  
Study Group ◽  
Fat Mass Index ◽  
Good Evaluation ◽  
Hydrostatic Weighing ◽  
Weighing Method ◽  
Hydrostatic Weighing Method

A good evaluation of the nutritional status requires knowledge on body composition, casting doubts on the accuracy of some indexes. herefore, the aim of this study was to analyze the accuracy of the following nutritional status indexes: Body Mass Index (BMI), BMI elevated to 2.5 (BMI2.5), Fat Mass Index (FMI) and BMI adjusted for fat mass (BMIfat). Participated of this study 280 subjects (aged 17-48 years), from which the results of BMI, BMI2.5, FMI and BMIfat indexes were analyzed, having the Hydrostatic Weighing method as reference. FMI presented the highest concordance value, but classiied as discrete (k=0.21). he other indexes presented small concordance with results of the reference method (k<0.20). In conclusion, none of the indexes investigated has good accuracy in assessing the nutritional status of the study group, considering that, although they show results of correlation with the reference method, they do not reach the minimum agreement criterion.

scholarly journals Density of Single Crystals of Ice from a Temperate Glacier

1955 ◽  
Vol 2 (18) ◽  
pp. 553-559 ◽  
Author(s):  
T. R. Butkovich
Keyword(s):  
Single Crystals ◽  
Maximum Error ◽  
Ice Crystals ◽  
Hydrostatic Weighing ◽  
Weighing Method ◽  
Error Computation ◽  
Crystal Aggregate ◽  
Hydrostatic Weighing Method

AbstractDensity of single crystals of ice from the Mendenhall Glacier near Juneau, Alaska, a temperate glacier, was determined by the hydrostatic weighing method. It was found that the densities of single crystals are slightly but measurably variable from one crystal to another. The values range from a minimum of 0.91712 gm./cm.3 to a maximum of 0.91728 gm./cm.3, when corrected for −3.5° C., for the eight crystals measured. Any imperfections such as Tyndall figures (hexagonal prismatic voids) were immediately evident in the density determinations, and correction for these imperfections give a corrected density essentially the same as that of clear specimens. Two clear crystal aggregate specimens tested had a lower density than the pure single ice crystals. An error computation gives the value of the estimated maximum error of the density determinations as ±2.1×10−5 gm./cm.3.

scholarly journals Evaluation of porosity of AlZn5Mg castings made by squeeze casting technology

2019 ◽  
pp. 12-19
Author(s):  
Kinga Boroń
Keyword(s):  
Squeeze Casting ◽  
Middle Part ◽  
Squeeze Pressure ◽  
Gravity Casting ◽  
Hydrostatic Weighing ◽  
Structural Tests ◽  
Alloy Castings ◽  
Weighing Method ◽  
The Impact ◽  
Hydrostatic Weighing Method

The paper shows the results of research aimed to assess the impact of high squeeze pressure on the porosity of AlZn5Mg alloy castings, including its distribution in slab-type castings with dimensions of 25 x 100 x 200 mm. The research was carried out on castings made by two methods: squeeze casting and gravity casting. The pressing was conducted at a pressure of 100 MPa at an initial mould temperature of 200°C. The research identified the middle and outer parts of the casting. Experimental research was preceded by numerical simulation of the casting solidification, then a porosity assessment was carried out using the hydrostatic weighing method, which was supplemented by structural observations. The results of the research showed a two-fold decrease in the porosity in the middle part of the casting which is most exposed to the occurrence of shrinkage voids formed in the final clotting phase. Structural tests revealed the occurrence of dispersed porosity in castings, mainly of shrinkage and / or shrinkage-gas origin. The impact of pressure of 100 MPa during solidification caused fragmentation of the primary structure of castings, which resulted in a higher grain density.

scholarly journals Study of the samples of polymer composite materials with an uneven surface using hydrostatic weighing

2018 ◽  
Vol 84 (8) ◽  
pp. 32-35
Author(s):  
M. I. Dushin ◽  
K. I. Donetski ◽  
R. Yu. Karavaev ◽  
A. A. Platonov
Keyword(s):  
Composite Materials ◽  
Polymer Composite ◽  
Physical And Mechanical Properties ◽  
Binder Content ◽  
Polymer Composite Materials ◽  
Uneven Surface ◽  
Carbon Plastics ◽  
New Energy ◽  
Hydrostatic Weighing

An increase in the size and the number of the elements of the aircraft structures made of polymer composite materials (PCM) required the search for new energy-saving and less expensive non-autoclave technologies. The use of one of them, vacuum infusion, inevitably leads to formation of an uneven surface, thus inhibiting determination of the true thickness by standard methods, and, in turn, affects determination of the physical and mechanical properties of the material. The results of measuring density of carbon plastics by hydrostatic weighing are presented to calculate the true thickness of materials, volume content of binder and porosity. The developed method is also suitable for PCMs based on combustible reinforcing materials like organic plastics, hybrid and other materials that cannot be subjected to burning-off to determine the binder content.

scholarly journals ДОСЛІДЖЕННЯ ОСОБЛИВОСТЕЙ ПРИСКОРЕНОГО РОЗКЛАДУ ВТОРИННИХ ПОЛІОЛЕФІНІВ

2018 ◽  
Vol 122 (3) ◽  
pp. 32-37
Author(s):  
Н. В. Сова ◽  
Б. М. Савченко ◽  
В. Г. Хоменко ◽  
О. В. Талалай
Keyword(s):  
Artificial Aging ◽  
Constant Pressure ◽  
Strength Properties ◽  
Ash Content ◽  
Capillary Viscometer ◽  
Efficient Technology ◽  
X Ray ◽  
Accelerated Degradation ◽  
Aging Conditions

Investigation of the features and conditions of accelerated degradation of films based on PE wastes to create and develop an efficient technology for the utilization of flexible polyolefin packaging. The chemical composition of the inorganic residue after the burning of polymers wastes was determined by X-ray fluorescence method. The determination of the MFI of PE was carried out in accordance with ISO 1133: 1997 on a capillary viscometer of constant pressure at a temperature (190 ± 0.5) °С and a weight of 2,16 kg. Deformation-strength properties - according to ASTM D638. Ash content - according to ISO 3451-2: 1998 «Plastics. Determination of ash content». The ability to accelerate the degradation of polyolefine wastes in an environment was established. The changes of mechanical properties of PE films of different composition in conditions of artificial aging were investigated. The ability of calcium carbonate to exhibit the effect of oxide additives in PE films during the aging process was revealed. The features of accelerated degradation of polyolefine wastes in artificial aging conditions were first discovered and investigated. Obtained initial data for the production of PE film technology based on polyolefine wastes, then capable of accelerated degradation under environmental conditions

Study of physical and mechanical properties of vanadium slag

2020 ◽  
Vol 76 (6) ◽  
pp. 614-619
Author(s):  
B. L. Demin ◽  
L. A. Smirnov ◽  
V. A. Rovnushkin ◽  
A. L. Smirnov
Keyword(s):  
Mechanical Properties ◽  
Physical And Mechanical Properties ◽  
Correct Choice ◽  
Vanadium Slag ◽  
Methods Of Evaluation ◽  
Hydrostatic Weighing ◽  
Technical Specifications ◽  
Mineral Compositions ◽  
Weighing Method ◽  
Labor Consuming

Technology of vanadium slag (VS) production and extraction vanadium out of it is money- and labor-consuming process, that stipulates the actuality of study of physical, mechanical and technological properties of VS and influences the effectiveness of its processing and utilization. It was noted, that the oxidizing-siliceous addition (OSA), used as a dilutant in the process of vanadium extraction, enables to ensure basic components content in the VS accounting the Technical Specifications ТУ 14-11-187–86. However, it changes the chemical and mineral compositions and distribution of metal inclusions by slag fractions, therefore all the studied parameters were considered by variants with the OSA and without it. The averaged chemical composition of VS, its mineral phases content and metal inclusions content presented. It was shown, that existing methods of evaluation of metal inclusions content in the VS do not ensure repeatability of the results. A methodology was proposed to evaluate slagging of metal inclusions by the hydrostatic weighing method. Besides, Influence of OSA on physical and mechanical properties of vanadium slag. A dependence of metal content in slag on its apparent density determined, which will increase accuracy of calculations of capacity of transport facilities, bunkers, warehouses etc. The study of the VS strength characteristics, knowledge of which is important for correct choice of crushing and grinding equipment, was accomplished with samples obtained with additions OSA and without OSA. The results obtained showed, that the strength of the VS without OSA is significantly higher, and the indices of crushability is lower, comparing with VS with OSA utilization. The VS with OSA additions is mechanical processed easier – at crushing, grinding. Besides, in this case the metal inclusions are opened better and during extraction out of a slag they are less slaggy.

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