scholarly journals Tertiary plutonic rocks of southern Serbia Vardar Zone as dimension stone

2014 ◽  
pp. 85-92
Author(s):  
Lidja Kuresevic ◽  
Vladimir Simic
Keyword(s):  
Field Study ◽  
Laboratory Testing ◽  
Dimension Stone ◽  
Vardar Zone ◽  
Technical Requirements ◽  
Large Size ◽  
Geological Factors ◽  
Laboratory Examinations ◽  
Technical Properties ◽  
Plutonic Rocks

Three granitoid plutons of south-Serbian part of the Vardar Zone, of Tertiary age were studied in order to establish their potential for utilization as dimension stone. These rocks vary in composition from quartzmonconite to quartzdiorite. Field study aimed at establishing the geological factors - presence of fractures, harmful minerals, alterations, jointing type and fabric homogeneity in order to determine the possibility of obtaining large size blocks of stone from the plutons. Laboratory examinations comprised petrological analyses and testing of technical properties. Stone from these plutons has shown favourable results in both field and laboratory examinations. Evaluation of the rock based on obtained laboratory testing results is performed according to technical requirements of the Serbian standard B.B3.200. It has shown that rocks from these plutons can be used as dimension stone for the production of slabs for the exterior and interior paving and cladding.

scholarly journals Inappropriate laboratory testing requests: perspectives of clinical laboratory professionals

2021 ◽  
Vol 3 (3) ◽  
pp. 249-256
Author(s):  
Sultan Alasmari ◽  
Keyword(s):  
Laboratory Testing ◽  
Clinical Laboratory ◽  
Educational Interventions ◽  
Cross Sectional Study ◽  
Medical Laboratory ◽  
Cross Sectional ◽  
Laboratory Staff ◽  
Level Of Satisfaction ◽  
Physician Awareness ◽  
Laboratory Examinations

Introduction: Laboratory examinations constitute a major factor in achieving the correct clinical diagnosis for patients. However, the ordering of unnecessary or inappropriate laboratory testing remains common, with consequent consumption of laboratory resources whether human or material. The present work evaluated the level of satisfaction of laboratory practitioners toward the appropriateness of laboratory tests ordered by physicians. Methods: This cross-sectional study involved a total of 256 medical laboratory practitioners representing different qualifications and health care sectors, who answered several questions concerning their knowledge and attitudes toward inappropriate laboratory testing ordered by physicians. Results: More than 85% of respondents agreed with the definition provided in the survey, which is substantially consistent with prior studies. More than 90% affirmed the associated drain on time and resources. However, discrepant responses were received concerning physician awareness of test availability, and participants reported laboratory staff arguments with physicians due to orders for unnecessary tests. Data showed that unnecessary orders were mainly requested by physicians of less experience. Conclusions: Ultimately, dissatisfaction was manifest among clinical laboratory professionals, and educational interventions are required to moderate request behaviors.

Notes on the Poster “Map of Natural Stones from Sardinia (Italy)”

2020 ◽  
Vol 848 ◽  
pp. 127-136
Author(s):  
Nicola Careddu ◽  
Massimo Scanu ◽  
Paolo Desogus
Keyword(s):  
Scientific Information ◽  
Dimension Stone ◽  
Stone Surface ◽  
Vast Array ◽  
Public Resource ◽  
Wide Range ◽  
Technical Properties ◽  
Natural Stones ◽  
User Friendly ◽  
Made In

Sardinia (Italy) produces a vast array of natural stones for ornamental use. Besides the internationally known pink and gray granites and the famous limestone known as Orosei marble, a wide range of vulcanites (basalts and “trachytes”) and phyllites - including yellow and ghiandone granites - are also produced. Orosei marbles are some of the most requested types today, which are marketed especially to China. However, there are a number of Sardinian natural stones, which have been quarried and marketed for fifty years, although no image or footage has been published yet: a mention of this natural stones has been only made in some old list of Sardinian stones. For this reason, authors suggested the publication of a poster (70 cm x 100 cm) showing a collection of natural stones quarried for ornamental purposes in Sardinia over the last fifty years. The poster includes a user-friendly map that has been adapted for school use and as a public resource in libraries. There are no previous publications showing a similar wide range of Sardinian stones. The poster offers scientific information about lithology, quarrying sites, dimension stone producing areas, quarries of historical and/or archaeological interest, historical trend in quarries output, technical properties, stone surface workability and a glossary.

scholarly journals Preliminary assessment of economic effect of transportation in the innovation cars with axial load of 27 tons at the area of the Eastern ground

2020 ◽  
Vol 78 (6) ◽  
pp. 351-357
Author(s):  
O. F. Miroshnichenko ◽  
A. E. Oginskaya
Keyword(s):  
Carrying Capacity ◽  
Axial Load ◽  
Economic Effect ◽  
Economic Assessment ◽  
Preliminary Assessment ◽  
Technical Requirements ◽  
Technical Properties ◽  
Train Length ◽  
The One ◽  
Maintenance Process

The article presents preliminary results of the comprehensive assessment of the economic effect for the infrastructure owner from transportation by trains composed with the innovation freight cars with axial load of 27 tons at the specific areas (grounds). Comprehensive economic assessment for the infrastructure owner consists in taking into account changes of expenses for improvement of technical properties of the new car, as well as the expenses for changes of the operation properties of the car handling areas, in particular: • one-time expenses for putting infrastructure of the areas of cars handling with the axial load from 25 to 27 tons in compliance with the new technical requirements; • financial results due to increase of carrying-capacity by means of increase of the weight at the permanent train length; • change of the current and one-time expenses for train traction composed of the innovation cars of increased carrying-capacity when changing the locomotive series and the number of section-kilometers per the unit of transportation operations.Calculations performed for the routes Chegdomyn – Vanino and Chelutay – Nakhodka indicated that effect of transportation in the innovation cars can be both positive and negative for the infrastructure owner depending on the operation and economic properties of the handling area (volume of transported freight in the examined cars, maintenance process of the locomotive runs, etc.).Taking into account the one-time costs for putting the superstructure in compliance with the technical requirements, the financial results of JSC “RZD” is getting worse at the examined routes.Obtained results have preliminary nature as more detailed accounting of expenses is required for putting infrastructure of the train handling areas composed from the cars of axial load 27 tons in compliance with the technical requirements.

scholarly journals Testing of electrocorundum powders of the company «Technoceramics» in the manufacture of ceramic molds

2019 ◽  
pp. 12-18
Author(s):  
T. F. Baranova ◽  
I. V. Dyakonova ◽  
N. I. Shunkina ◽  
S. I. Polyansky ◽  
Yu. R. Nurtdinov ◽  
...  
Keyword(s):  
Nickel Alloys ◽  
Metal Casting ◽  
Internal Cavity ◽  
Heat Resistant ◽  
Technical Requirements ◽  
Technical Properties

The technology of manufacturing ceramic molds from electrocorundum powders of the company «Technoceramics» for the casting of parts from heatresistant nickel alloys was investigated and developed. The powders were used instead of the commercially used electrocorundum powders of JSC Rusal. Molds for metal casting of various sizes and configurations of the internal cavity for casting cooled and uncooled blades of heat-resistant alloys were manufactured and tested. Technical properties of casting molds are preserved. The characteristics of castings of equiaxial and directional structure are provided in accordance with the technical requirements of the drawing and technical conditions. Ill. 5. Ref. 2. Tab. 6.

scholarly journals Construction and technical properties of PC 500 D0 CEMENT

2020 ◽  
Vol 77 (4) ◽  
pp. 129-137
Keyword(s):  
Mechanical Properties ◽  
Portland Cement ◽  
Solid Solutions ◽  
Water Consumption ◽  
Setting Time ◽  
Physical And Mechanical Properties ◽  
Cement Clinker ◽  
Technical Requirements ◽  
Portland Cement Clinker ◽  
Technical Properties

It is established that physical and mechanical properties of Portland cement, including setting time and strength, correspond to mark PC 500 D0 and meet technical requirements of the corresponding standard. However, they have increased dispersion ability and water consumption. It has been determined that the main Portland cement clinker minerals (C3S, β-C2S, C3A and C4AF) in cement are represented as solid solutions as a result of the presence of impurities in their structure.

Lateral earth pressure at rest and compressibility of municipal solid waste

2000 ◽  
Vol 37 (6) ◽  
pp. 1157-1165 ◽  
Author(s):  
A O Landva ◽  
A J Valsangkar ◽  
S G Pelkey
Keyword(s):  
Municipal Solid Waste ◽  
Solid Waste ◽  
Laboratory Testing ◽  
Earth Pressure ◽  
Split Ring ◽  
One Dimensional ◽  
Large Size ◽  
Lateral Earth Pressure ◽  
Marine Clays ◽  
Compressibility Characteristics

The paper presents the results of laboratory testing of municipal solid waste samples subjected to one-dimensional compression with measurement of lateral stresses. The details of a large-size split-ring apparatus specially developed for this research are presented along with the data on earth pressure at rest and compressibility characteristics. The results show the influence of fibre content on the coefficient of earth pressure at rest in waste materials. The "delayed compression" behaviour observed in the laboratory is shown to be similar to the concepts developed by Bjerrum for normally consolidated sensitive marine clays. Issues such as validity of laboratory testing and sample-size effects are also discussed.Key words: earth pressure at rest, municipal solid waste, compressibility.

Olivine nodules and related inclusions in trachyte from the Jos Plateau, Nigeria

1969 ◽  
Vol 37 (287) ◽  
pp. 370-374 ◽  
Author(s):  
J. B. Wright
Keyword(s):  
High Pressure ◽  
Partial Melting ◽  
Upper Mantle ◽  
High Pressures ◽  
The Other ◽  
Volcanic Province ◽  
Jos Plateau ◽  
Large Size ◽  
Plutonic Rocks

SummaryA trachyte plug near Jos contains a suite of inclusions, commonly rounded and of large size, including olivine nodules, pyroxenites, and a variety of basic to intermediate plutonic rocks, as well as albite megacrysts.The olivine nodules are typical of those found elsewhere in alkaline basic lavas and widely interpreted as upper mantle fragments. Most of the other inclusions contain evidence of crystallization at high pressures, even the syenites, which are interpreted as plutonic equivalents of the trachyte; for the feldspar in them is sanidine-microperthite.Discovery of this inclusion assemblage in a trachyte provides further support for the thesis that alkaline salic lavas can be generated at sub-crustal depths, by partial melting beneath domically uplifted continental shield areas (Bailey, 1964).The Nigerian Cenozoic volcanic province lies in an area of regional uplift, and is characterized by scattered small volcanic centres rather than by major eruptive foci. High pressure inclusions are being found at an increasing proportion of these centres, suggesting that the magmas rose directly and rapidly to the surface from the upper mantle levels at which they were all (including the trachyte) generated.

scholarly journals Using of Aerogel to Improve Thermal Insulating Properties of Windows

2018 ◽  
Vol 14 (1) ◽  
pp. 2-11 ◽  
Author(s):  
Denisa Valachova ◽  
Nada Zdrazilova ◽  
Vladan Panovec ◽  
Iveta Skotnicova
Keyword(s):  
Thermal Conductivity ◽  
Thermal Insulation ◽  
Building Structures ◽  
Insulating Materials ◽  
Insulating Material ◽  
Composite Systems ◽  
Thermal Insulating ◽  
Technical Requirements ◽  
Technical Properties ◽  
Insulating Properties

AbstractFor the best possible thermal-technical properties of building structures it is necessary to use materials with very low thermal conductivity. Due to the increasing thermal-technical requirements for building structures, the insulating materials are developed. One of the modern thermal insulating materials is so-called aerogel. Unfortunately, this material is not used in the field of external thermal insulation composite systems because of its price and its properties. The aim of this paper is to present possibilities of using this insulating material in the civil engineering - specifically a usage of aerogel in the production of windows.

Coherency loss in γ' precipitates in nickel-base superalloy

1983 ◽  
Vol 41 ◽  
pp. 244-245
Author(s):  
R. A. Ricks ◽  
Angus J. Porter
Keyword(s):  
Lattice Mismatch ◽  
Lattice Parameter ◽  
Nickel Base Superalloy ◽  
Large Size ◽  
The Matrix ◽  
Nimonic 80A ◽  
Interfacial Dislocations ◽  
Nickel Base ◽  
Coherency Loss ◽  
Nimonic 115

During a recent investigation concerning the growth of γ' precipitates in nickel-base superalloys it was observed that the sign of the lattice mismatch between the coherent particles and the matrix (γ) was important in determining the ease with which matrix dislocations could be incorporated into the interface to relieve coherency strains. Thus alloys with a negative misfit (ie. the γ' lattice parameter was smaller than the matrix) could lose coherency easily and γ/γ' interfaces would exhibit regularly spaced networks of dislocations, as shown in figure 1 for the case of Nimonic 115 (misfit = -0.15%). In contrast, γ' particles in alloys with a positive misfit could grow to a large size and not show any such dislocation arrangements in the interface, thus indicating that coherency had not been lost. Figure 2 depicts a large γ' precipitate in Nimonic 80A (misfit = +0.32%) showing few interfacial dislocations.

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