scholarly journals Improving ANFO: Effect of Additives and Ammonium Nitrate Morphology on Detonation Parameters

Materials ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 5745
Author(s):  
Magdalena Fabin ◽  
Tomasz Jarosz
Keyword(s):  
Ammonium Nitrate ◽  
Water Resistance ◽  
Fuel Oil ◽  
Potential Hazard ◽  
Negative Effects ◽  
Simple Method ◽  
Factors Affecting ◽  
Detonation Parameters ◽  
Effect Of Additives ◽  
Method Of Production

Ammonium nitrate–fuel oil (ANFO) is one of the most widely used explosives for civilian purposes. Its main advantages are its low price and simple method of production. The main disadvantages of this material are low water resistance and problems related to non-ideal detonation, which can be a potential hazard when using ANFO. Due to this, research has been conducted for many years to find suitable additives for ANFO that would have the effect of offsetting its drawbacks. The aim of this review was to describe factors affecting the energetic properties of ANFO, including the highlighting of substances that could potentially be additives to ANFO formulations that would reduce the negative effects of non-ideal detonation, while avoiding adversely impacting the effectiveness of the explosive in blasting operations, as well as its sensitivity parameters.

Enhancing the mechanical and water resistance performances of bamboo particle reinforced polypropylene composite through cell separation

Holzforschung ◽  
2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Dan Ren ◽  
Xuexia Zhang ◽  
Zixuan Yu ◽  
Hankun Wang ◽  
Yan Yu
Keyword(s):  
Water Absorption ◽  
Cell Separation ◽  
Water Resistance ◽  
Dynamic Mechanical Properties ◽  
Simple Method ◽  
Interface Modification ◽  
Wood Particles ◽  
Bamboo Fibers ◽  
Pp Composites ◽  
Mechanical Performances

AbstractIt is frequently observed that bamboo particle composites (BPCs) do not show higher mechanical performances than the corresponding wood particles composites (WPCs), although bulk bamboo is much stronger than wood in mechanical performances. Herein this phenomenon was demonstrated from the cell compositions in the applied bamboo particles. To address that, a simple method to physically separate bamboo fibers (BFs) and bamboo parenchyma cells (BPs) from a bamboo particle mixture was developed. Polypropylene (PP) composites with pure BFs, BPs, a mixture of BFs and BPs (BFs + BPs), wood particles (WPs) as fillers were prepared. The flexural and dynamic mechanical properties, water absorption, and thermal properties were determined. The BF/PP composites showed the best mechanical performances (MOR at 35 MPa, MOE at 2.4 GPa), followed by WP/PP, (BF + BP)/PP, and BP/PP. They also exhibited the lowest water absorption and thickness swelling. Little difference was found for the thermal decomposition properties. However, a lower activation energy of BF/PP compared with BP/PP implied an uneven dispersion of BFs and weaker interfacial interaction between BF and PP. The results suggest that the mechanical performances and water resistance of bamboo particle/polymer composites can be significantly improved through cell separation. However, interface modification should be applied if higher performances of BF/PP composites are required.

Characteristics of Rg waves recorded from quarry blasts in central Texas

1995 ◽  
Vol 85 (4) ◽  
pp. 1232-1235
Author(s):  
Tom T. Goforth ◽  
Jessie L. Bonner
Keyword(s):  
Ammonium Nitrate ◽  
Fuel Oil ◽  
Working Face ◽  
Central Texas ◽  
Seismological Observatory

Abstract Chemical blasts from quarrying operations in central Texas are routinely recorded by the W. M. Keck Foundation Seismological Observatory near China Spring, Texas. The Keck Observatory consists of a single, broadband, three-component, borehole seismograph system. Five quarries, located at distances ranging from 16 to 101 km from the observatory, each detonate from 1 to 6 tons of ammonium nitrate/fuel oil explosive on the average of twice per week. For every quarry for which the orientation of the working face could be determined, dispersed Rg waves are recorded at the Keck Observatory from those quarries at which the working face is directed away from the observatory, but are not observed or are severely attenuated from those quarries at which the working face is directed toward the observatory. Seismograms containing the dispersed Rg are easily recognized as quarry blasts, but those in which the dispersed Rg is absent look like small earthquakes.

Review of the impact Covid-19 has on the Psychosocial factors affecting Well-Being

2021 ◽  
pp. 3404-3408
Author(s):  
Sheila Menon FBSCH ◽  
Vidya Bhagat
Keyword(s):  
Psychosocial Factors ◽  
Health Workers ◽  
Public Awareness ◽  
Cost Effective ◽  
Well Being ◽  
Security Measures ◽  
Post Traumatic Stress ◽  
Negative Effects ◽  
Factors Affecting ◽  
The Impact

The COVID-19 pandemic has had a significant impact on the psychosocial factors that effect people globally. Particularly affected are children, students and health workers and the common symptoms identified are stress, anxiety disorders, depression and post-traumatic stress disorder. In addition, the various security measures implemented to ensure public safety have adversely affected relationships between people. This study directs public awareness to the value of psychotherapeutic support. Tele-therapy can be offered easily to people both at home or in the workplace, providing both cost effective and time sensitive solutions during times of crisis. The current review article provides an overview of the importance of maintaining psychological well-being during a pandemic and the identifies the role that empathetic communication has on wellbeing. The literature review was completed using electronic databases such as PubMed, Medline, and Scopus databases using the keywords covid-19, affected groups, affected relationships, psychology and its technological interventions, negative effects of pandemic so on.

scholarly journals Study on the Factors Affecting the Financing of High-Tech SMEs

2017 ◽  
Vol 13 (8) ◽  
pp. 121
Author(s):  
Mingjun Zhu
Keyword(s):  
Positive Relationship ◽  
Significance Test ◽  
High Tech ◽  
Negative Effects ◽  
Factors Affecting ◽  
Enterprise Growth ◽  
Tax Shield ◽  
Debt Tax Shield ◽  
Major Factors ◽  
Tangible Asset

High-tech small and medium-sized enterprises (SMEs) have played an important role in promoting the development of Chinese national economy, but most of them are still facing the difficulty in financing. This paper determines the major factors affecting the financing for high-tech SMEs by using multiple linear regression (MLR) method and significance test then comes to a conclusion that enterprise scale, enterprise growth, tangible asset ratio and equity liquidity have positive relationship with the financing of high-tech SMEs while profitability, accumulation, non-debt tax shield and solvency have negative effects.

Safety assessment of Ammonium Nitrate Fuel Oil (ANFO) manufactory

2018 ◽  
pp. 35-39
Author(s):  
D.S. Bonifácio ◽  
E.B.F. Galante ◽  
A.N. Haddad
Keyword(s):  
Ammonium Nitrate ◽  
Safety Assessment ◽  
Fuel Oil

scholarly journals Development of the Russian tourism industry during the pandemic: an innovative approach

2021 ◽  
Vol 291 ◽  
pp. 05043
Author(s):  
Elena Oklirimeiiko ◽  
Sergey Chernov
Keyword(s):  
Tourism Industry ◽  
External Factors ◽  
Innovative Approach ◽  
Negative Effects ◽  
Factors Affecting ◽  
Travel And Tourism ◽  
Domestic Tourism ◽  
Event Tourism ◽  
Internal And External Factors ◽  
Tourism Services

The article deals with internal and external factors affecting the tourism industry in Russia as well as the ways of its promotion and development. The authors analyze decrease in sales in the tourism industry at the present period; the situation with provision of tourism services during the pandemic is identified and justified; the negative effects of the crisis are revealed. The authors also point out and present positive factors, which stimulate travel and tourism, including hotel business, catering, as well as resort business; the possibility of finding new ways to promote tourism industry is justified. The authors also analyze the main measures of tourism industry’s state support. The article considers dominant areas affecting the development of domestic tourism. The authors assess main aspects contributing to the development of event tourism. Conditions for the development of sports and event tourism are investigated and discussed; special features of tourism industry stimulation during the pandemic are presented. The authors consider and justify the possibility of restoring the tourist market.

scholarly journals Structural and Morphological Quantitative 3D Characterisation of Ammonium Nitrate Prills by X-Ray Computed Tomography

Materials ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1230
Author(s):  
Fabien Léonard ◽  
Zhen Zhang ◽  
Holger Krebs ◽  
Giovanni Bruno
Keyword(s):  
Computed Tomography ◽  
Specific Surface ◽  
Ammonium Nitrate ◽  
Surface Area ◽  
Specific Surface Area ◽  
Volume Fraction ◽  
Fuel Oil ◽  
X Ray ◽  
Oil Retention ◽  
X Ray Computed

The mixture of ammonium nitrate (AN) prills and fuel oil (FO), usually referred to as ANFO, is extensively used in the mining industry as a bulk explosive. One of the major performance predictors of ANFO mixtures is the fuel oil retention, which is itself governed by the complex pore structure of the AN prills. In this study, we present how X-ray computed tomography (XCT), and the associated advanced data processing workflow, can be used to fully characterise the structure and morphology of AN prills. We show that structural parameters such as volume fraction of the different phases and morphological parameters such as specific surface area and shape factor can be reliably extracted from the XCT data, and that there is a good agreement with the measured oil retention values. Importantly, oil retention measurements (qualifying the efficiency of ANFO as explosives) correlate well with the specific surface area determined by XCT. XCT can therefore be employed non-destructively; it can accurately evaluate and characterise porosity in ammonium nitrate prills, and even predict their efficiency.

scholarly journals A Qualitative Study of Cause-Related Marketing Campaigns and Consumers’ Purchase Intention of On-Demand Ride Services in Egypt

2019 ◽  
Vol 5 (1) ◽  
pp. 26
Author(s):  
Rana Essam Shazly ◽  
Abeer A. Mahrous
Keyword(s):  
Purchase Intention ◽  
Qualitative Interviews ◽  
Negative Effects ◽  
Consumer Responses ◽  
Factors Affecting ◽  
On Demand ◽  
Cause Related Marketing ◽  
Corporate Credibility ◽  
Social Venture ◽  
Cause Involvement

Corporate Social Responsibility (CSR) has become a matter of interest for academics and practitioners especially in the form of Cause-Related Marketing (CRM). The paper aims to revisit CRM campaign dimensions shaping consumer responses in terms of attitude toward firms and purchase intention in a less research market such as Egypt. Exploratory qualitative interviews were employed of thirteen in-depth interviews and one focus group (seven participants) with Egyptians using on-demand ride services. The current study shed the lights on the main CRM campaign factors affecting purchase intention and firm attitude. Those factors are cause involvement, consumers’ participation effort, company-cause fit, corporate credibility, altruistic attribution, campaign feedback, socio-demographic dimensions, and skepticism. Results revealed that campaign feedback has a master effect on consumers’ attitudes and purchasing behavior and wasn’t studied heavily in the literature. Also, the importance of the cause itself and how consumers are personally involved in the social issue is of great concern. Consumers’ skepticism and degree of participation effort required from consumers result in negative effects on their attitude toward firms which in turn affect their purchase intention. Yet, managers should inform consumers by how the company is using their donations, additionally; they should hamper consumers’ skepticism and enhance their trust in the socially conscious brands. People have to be updated with the campaign’s achievement and progress on a regular base. Eventually, determining the antecedents of CRM campaigns would help managers in selecting the best partners for an effective social venture.

Evaluation of extent and amount of heterogeneous variance for milk yield in Uruguayan Holsteins

2001 ◽  
Vol 72 (2) ◽  
pp. 259-268 ◽  
Author(s):  
J. I. Urioste ◽  
D. Gianola ◽  
R. Rekaya ◽  
W. F. Fikse ◽  
K. A. Weigel
Keyword(s):  
Milk Yield ◽  
Phenotypic Variance ◽  
Simple Method ◽  
Factors Affecting ◽  
Lorenz Curves ◽  
Gini Coefficients ◽  
Adjustment Procedure ◽  
Contemporary Group ◽  
Lactation Length ◽  
Log Linear

AbstractThe extent and amount of heterogeneous phenotypic variance for milk yield in the Uruguayan Holstein population were evaluated and a simple method of accounting for heterogeneity was developed. Lactation records (159 169) collected between 1989 and 1998 by two recording schemes were used to form 8955 herd-year-season-parity-lactation length contemporary groups. A log-linear model was used to identify factors affecting heterogeneity of phenotypic variance. The model included effects of production level, contemporary group size, recording scheme, herd, season of calving, parity number, calving year period and length of lactation and accounted for 50% of the variation in log variances. Estimates from this model were used in a Bayesian manner, to obtain posterior mean estimates of within-contemporary-group variances, which were then used to standardize records to a baseline variance. Effects of the adjustment were assessed by comparing coefficients of variation before and after correction, by correlation and regression between mean and standard deviations, and by using Gini coefficients and Lorenz curves. The adjustment procedure reduced heteroscedasticity primarily by decreasing the frequency of low-variance contemporary groups. Lorenz curves and Gini coefficients indicated that the largest impact of the standardization procedure was related to the size of the contemporary group. Some differences in the effect of the correction were found between recording schemes. The method for adjusting records is simple and easy to adapt to current genetic evaluation procedures.

scholarly journals Quantifying the Influence of Larval Density on Disease Transmission Indices in Culex quinquefasciatus, the Major African Vector of Filariasis

2019 ◽  
Vol 11 ◽  
pp. 117954331985602 ◽  
Author(s):  
Azubuike Christian Ukubuiwe ◽  
Chioma Cynthia Ojianwuna ◽  
Israel Kayode Olayemi ◽  
Francis Ofurum Arimoro ◽  
Innocent Chukwuemeka James Omalu ◽  
...  
Keyword(s):  
Culex Quinquefasciatus ◽  
Disease Transmission ◽  
Abiotic Factors ◽  
Larval Density ◽  
Field Trials ◽  
Negative Effects ◽  
Laboratory Findings ◽  
Factors Affecting ◽  
Adult Fitness ◽  
Larval Crowding

Larval crowding is one of the abiotic factors affecting biological fitness in mosquitoes. This study aims at elucidating, quantitatively, the influence of more larval crowding on aspects of fitness in Culex quinquefasciatus mosquito. To this end, day-old larvae of the species were reared in 4 density regimens equivalent to 1 larva in 1.25, 2.5, 5, and 10 mL of distilled water. Developmental indices, adult fitness indices, and accumulation and utilisation of teneral reserves for metamorphosis were determined at these density regimens. The results revealed varying significant negative effects of larval density on all fitness indices measured for the species. The study also revealed high utilisation of teneral reserves for metamorphosis at high larval densities. The information generated will be useful in making informed-decisions in allocating scare resources for vector control, although field trials are advocated to establish these laboratory findings.

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