scholarly journals Large-Scale Blasts Seismic Load on Natural and Technical Objects

2015 ◽  
Vol 4 (2) ◽  
pp. 33-39 ◽  
Author(s):  
Сясько ◽  
A. Syasko ◽  
Гриб ◽  
G. Grib ◽  
Гриб ◽  
...  
Keyword(s):  
Vibrational Frequency ◽  
Large Scale ◽  
Seismic Load ◽  
Frequency Content ◽  
Spectral Content ◽  
Seismic Safety ◽  
Direct Measurements ◽  
Seismic Impact ◽  
Maximal Shift

Seismic safety of large-scale blasts is one of the most important geoecological aspects of open-cut mining. Seismic load of largescale blasts which defines integrity of industrial and residential objects is of special interest. The work represents evaluation of negative seismic impact of large-scale blasts at «Neryungrinskiy» open-cut on the natural and technical systems located in the blasting zone. The main characteristic of evaluated seismic load of explosion wave damaging natural and technical constructions is the maximal value of vectorial velocity of earth movement during large-scale blasts. Determination of permissible speed fluctuation included its frequency content, as waves of different frequency with equal values of drift velocity are dangerous to various extents. Peculiarities of vibrational frequency of the constructions caused by seismic load of the blasts and self-induced vibrations were taken into account while evaluating seismic load. Considering spectral content of the vibrations caused by the blasts and self-induced vibrations values of gas containers and constructions of compressor station, it’s necessary to point out that the frequencies differ for 1,5—2 times and this is the favourable factor because of impossibility of resonant phenomena occurrence. Determination of permissible velocity included swinging of the building. Swinging is understood as ratio of maximal shift of the measured at the top points of the constructions to maximal shift of the foundation ground. According to the results of direct measurement, swinging does not exceed 1,5 times that’s why it is possible to found on prevailing values of ratios, calculated by means of experimental way as statistically explained. The permissible velocity should be accepted as Uperm — 1,25 cm/s. for the objects. By “swing” we understand the correlation of maximum offset measured on top of construction to maximum offset of subfoundation. According to direct measurements offset rate stays below 1,5, therefore we can rely on prevailing experimentally obtained value of correlations and set allowable speed to Ual = 1,25 sm/s.

Seismic safety of large-scale blasting in natural stone quarries

2020 ◽  
pp. 32-36
Author(s):  
S. G. Onika ◽  
◽  
F. G. Khalyavkin ◽  
A. K. Gets ◽  
V. Ch. Orlovsky ◽  
...  
Keyword(s):  
Delay Interval ◽  
Large Scale ◽  
Seismic Waves ◽  
Probabilistic Approach ◽  
Prediction Method ◽  
Natural Stone ◽  
Seismic Stability ◽  
Technical Documentation ◽  
Seismic Safety ◽  
Seismic Impact

In actual practice, reduction of seismic impact of blasts down to safe level is based on standard technical documentation as well as on recommendations developed by research institutions and specialized agencies. Chiefly, these regulations are concerned with limitation of explosive mass. In the meanwhile, blasting efficiency is governed by strength of rock, various degrees of rock mass fracturing and watering, as well as by different seismic stability of close-spaced facilities, which requires application of different kinds of explosives. This article presents a case-study of seismically safe blasting design and justification for Mikashevichi granite quarry based on the PPV prediction in the basement of guarded objects. The quarry zoning is accomplished by the criterion of allowable explosive mass per one delay interval. The probabilistic PPV prediction method is described. The residential and industrial facilities within the seismic impact zone of blasting in Mikashevichi quarry can experience adverse effect of seismic waves during mining advance, which requires introduction of differentiated limitation of allowable explosive mass per one delay interval. The probabilistic approach to blasting pattern design with regard to theoretical distribution of seismicity coefficients ensures the seismic safety of blasting. The developed chart of seismically safe explosive charges per delay interval ensures integrated safety of all guarded objects at the natural stone quarry, with allowance for closer spaced blasting operations and subsequent mining advance.

scholarly journals CALCULATION OF QUANTITATIVE INDICATORS SEISMIC IMPACT ON STORAGE TANKS FOR LIQUEFIED NATURAL GAS IN SOUTHERN SAKHALIN, ANIVA BAY

2016 ◽  
Vol 1 (12) ◽  
pp. 65-70
Author(s):  
Завадская ◽  
Elena Zavadskaya ◽  
Ковальчук ◽  
Oleg Kovalchuk
Keyword(s):  
Natural Gas ◽  
Large Scale ◽  
Liquefied Natural Gas ◽  
Seismic Action ◽  
Seismic Safety ◽  
Aniva Bay ◽  
Hazardous Area ◽  
Seismic Impact ◽  
Quantitative Indicators ◽  
The City

Currently, topical issue of seismic safety of a object of special type. In Russia, in 2009, put into operation a plant for the production, storage and transportation of liquefied natural gas (LNG text below) located in a seismically hazardous area. The most catastrophic consequences will arise if, as a result of the earthquake, there will be large-scale destruction of the LNG storage tank, located on the territory of the plant. To evaluate the seismic safety of a particular type of facilities, it is first necessary to determine the data describing the quantitative indicators of seismic effects on these facilities. To simulate the seismic action is necessary to set the parameters: the area under consideration - the southern part of Sakhalin Island, near the Aniva Bay, the city of Yuzhno-Sakhalinsk; isothermal tank (hereinafter referred IT) is a double-walled construction of 100 thousand m ^ 3, the height of 37 m and a diameter of 67 m.; natural gas, poured into the IT, is cooled to a temperature of minus 160 ° C. Turning to the liquid state, the volume is reduced by more than 600 times. After cooling, the LNG is stored at a temperature of minus 158 ° C.

Large-scale Motion of Solar Filaments

2000 ◽  
Vol 179 ◽  
pp. 205-208
Author(s):  
Pavel Ambrož ◽  
Alfred Schroll
Keyword(s):  
Magnetic Flux ◽  
Proper Motion ◽  
Time Scale ◽  
Large Scale ◽  
Accuracy Of Measurements ◽  
Solar Filaments ◽  
General Movement ◽  
Scale Motion ◽  
Velocity Scatter

AbstractPrecise measurements of heliographic position of solar filaments were used for determination of the proper motion of solar filaments on the time-scale of days. The filaments have a tendency to make a shaking or waving of the external structure and to make a general movement of whole filament body, coinciding with the transport of the magnetic flux in the photosphere. The velocity scatter of individual measured points is about one order higher than the accuracy of measurements.

An Improved Quantitative Image Analyser

1977 ◽  
Vol 35 ◽  
pp. 226-227
Author(s):  
J.P. Fallon ◽  
P.J. Gregory ◽  
C.J. Taylor
Keyword(s):  
Feature Extraction ◽  
Quantitative Analysis ◽  
Frequency Content ◽  
General Sense ◽  
Physical Measurements ◽  
Quantitative Image ◽  
Image Analyser ◽  
Automatic Methods ◽  
Quantitative Results

Quantitative image analysis systems have been used for several years in research and quality control applications in various fields including metallurgy and medicine. The technique has been applied as an extension of subjective microscopy to problems requiring quantitative results and which are amenable to automatic methods of interpretation.Feature extraction. In the most general sense, a feature can be defined as a portion of the image which differs in some consistent way from the background. A feature may be characterized by the density difference between itself and the background, by an edge gradient, or by the spatial frequency content (texture) within its boundaries. The task of feature extraction includes recognition of features and encoding of the associated information for quantitative analysis.Quantitative Analysis. Quantitative analysis is the determination of one or more physical measurements of each feature. These measurements may be straightforward ones such as area, length, or perimeter, or more complex stereological measurements such as convex perimeter or Feret's diameter.

Methods for the Quantification of Salivary Cortisol and of a-amylase in Biosensors and Portable Devices

2018 ◽  
Vol 68 (12) ◽  
pp. 2857-2859
Author(s):  
Cristina Mihaela Ghiciuc ◽  
Andreea Silvana Szalontay ◽  
Luminita Radulescu ◽  
Sebastian Cozma ◽  
Catalina Elena Lupusoru ◽  
...  
Keyword(s):  
Real Time ◽  
Medical Practice ◽  
Salivary Cortisol ◽  
Clinical Studies ◽  
Large Scale ◽  
Psychological Research ◽  
Portable Devices ◽  
Salivary Amylase ◽  
Specificity And Sensitivity

There is an increasing interest in the analysis of salivary biomarkers for medical practice. The objective of this article was to identify the specificity and sensitivity of quantification methods used in biosensors or portable devices for the determination of salivary cortisol and salivary a-amylase. There are no biosensors and portable devices for salivary amylase and cortisol that are used on a large scale in clinical studies. These devices would be useful in assessing more real-time psychological research in the future.

Identification of N-Substituted Triazolo-azetidines as Novel Antibacterials using pDualrep2 HTS Platform

2019 ◽  
Vol 22 (5) ◽  
pp. 346-354
Author(s):  
Yan A. Ivanenkov ◽  
Renat S. Yamidanov ◽  
Ilya A. Osterman ◽  
Petr V. Sergiev ◽  
Vladimir A. Aladinskiy ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Large Scale ◽  
Underlying Mechanism ◽  
Luciferase Assay ◽  
Reporter System ◽  
E Coli ◽  
Starting Point ◽  
High Concentrations ◽  
Mic Value

Aim and Objective: Antibiotic resistance is a serious constraint to the development of new effective antibacterials. Therefore, the discovery of the new antibacterials remains one of the main challenges in modern medicinal chemistry. This study was undertaken to identify novel molecules with antibacterial activity. Materials and Methods: Using our unique double-reporter system, in-house large-scale HTS campaign was conducted for the identification of antibacterial potency of small-molecule compounds. The construction allows us to visually assess the underlying mechanism of action. After the initial HTS and rescreen procedure, luciferase assay, C14-test, determination of MIC value and PrestoBlue test were carried out. Results: HTS rounds and rescreen campaign have revealed the antibacterial activity of a series of Nsubstituted triazolo-azetidines and their isosteric derivatives that has not been reported previously. Primary hit-molecule demonstrated a MIC value of 12.5 µg/mL against E. coli Δ tolC with signs of translation blockage and no SOS-response. Translation inhibition (26%, luciferase assay) was achieved at high concentrations up to 160 µg/mL, while no activity was found using C14-test. The compound did not demonstrate cytotoxicity in the PrestoBlue assay against a panel of eukaryotic cells. Within a series of direct structural analogues bearing the same or bioisosteric scaffold, compound 2 was found to have an improved antibacterial potency (MIC=6.25 µg/mL) close to Erythromycin (MIC=2.5-5 µg/mL) against the same strain. In contrast to the parent hit, this compound was more active and selective, and provided a robust IP position. Conclusion: N-substituted triazolo-azetidine scaffold may be used as a versatile starting point for the development of novel active and selective antibacterial compounds.

scholarly journals Revealing the constituents of Egypt’s oldest beer using infrared and mass spectrometry

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Mohamed A. Farag ◽  
Moamen M. Elmassry ◽  
Masahiro Baba ◽  
Renée Friedman
Keyword(s):  
Large Scale ◽  
Beer Brewing ◽  
Chemical Signatures ◽  
Chemical Determination ◽  
Materials Used ◽  
High Level ◽  
Beer Production ◽  
First Time ◽  
Detailed Chemical

Abstract Previous studies have shown that the Ancient Egyptians used malted wheat and barley as the main ingredients in beer brewing, but the chemical determination of the exact recipe is still lacking. To investigate the constituents of ancient beer, we conducted a detailed IR and GC-MS based metabolite analyses targeting volatile and non-volatile metabolites on the residues recovered from the interior of vats in what is currently the world’s oldest (c. 3600 BCE) installation for large-scale beer production located at the major pre-pharaonic political center at Hierakonpolis, Egypt. In addition to distinguishing the chemical signatures of various flavoring agents, such as dates, a significant result of our analysis is the finding, for the first time, of phosphoric acid in high level probably used as a preservative much like in modern beverages. This suggests that the early brewers had acquired the knowledge needed to efficiently produce and preserve large quantities of beer. This study provides the most detailed chemical profile of an ancient beer using modern spectrometric techniques and providing evidence for the likely starting materials used in beer brewing.

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