scholarly journals Fundamental Investigation for Processing of Pb-Cu-S-Bearing Materials

Metals ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 74
Author(s):  
Christoph Zschiesche ◽  
Jürgen Antrekowitsch
Keyword(s):  
Oxygen Potential ◽  
Lead Concentration ◽  
Raw Materials ◽  
Research Work ◽  
Distribution Coefficients ◽  
Condensed Phases ◽  
Fundamental Investigation ◽  
Bearing Materials ◽  
The Right ◽  
The Impact

The processing of polymetallic materials provides some challenges to every flowsheet. Within Aurubis Cu-Pb-metallurgical flowsheet, a broad range of raw materials and intermediates are processed. Continuous improvements are required to adapt the flowsheet according to the changing material quantity and quality. Therefore, thermodynamic modeling is the desired and most efficient way to conduct scenario analysis. Hence, databases and software are becoming better and better as the acceptance of this method increased. Further understanding is promoted by conducting experimental test work to validate the calculated results. In this research work, the impact of various oxygen potential on the formation of the condensed phases’ slag, matte, speiss and crude lead were investigated. A frequent check of slag metallurgy, in particular, the iron and lead concentration, provide feedback if the metallurgical process is operating at the right oxygen potential. Following, the calculated distribution coefficients for Cu, Pb, As, Sb, Sn and Ni between matte/speiss and speiss/lead are discussed.

scholarly journals Modified Nanoclays/Straw Fillers as Functional Additives of Natural Rubber Biocomposites

Polymers ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 799
Author(s):  
Justyna Miedzianowska ◽  
Marcin Masłowski ◽  
Przemysław Rybiński ◽  
Krzysztof Strzelec
Keyword(s):  
Natural Rubber ◽  
Raw Materials ◽  
Research Work ◽  
Damping Properties ◽  
Main Research ◽  
Functional Additives ◽  
Different Types ◽  
Elastomeric Materials ◽  
Research Goal ◽  
The Impact

Increasingly, raw materials of natural origin are used as fillers in polymer composites. Such biocomposites have satisfactory properties. To ensure above-average functional properties, modifications of biofillers with other materials are also used. The presented research work aimed to produce and characterize elastomeric materials with a straw-based filler and four different types of montmorillonite. The main research goal was to obtain improved functional parameters of vulcanizates based on natural rubber. A series of composites filled with straw and certain types of modified and unmodified nano-clays in various ratios and amounts were prepared. Then, they were subjected to a series of tests to assess the impact of the hybrids used on the final product. It has been shown that the addition of optimal amounts of biofillers can, inter alia, increase the tensile strength of the composite, improve damping properties, extend the burning time of the material and affect the course of vulcanization or cross-linking density.

scholarly journals The SME Condition During Covid 19 Pandemic: Financial And Business Overview

2021 ◽  
Vol 2 (3) ◽  
pp. 718-727
Author(s):  
Khalisa Rahmina Suryani ◽  
Rizka Zulfikar ◽  
Aida Vitria
Keyword(s):  
Raw Materials ◽  
Descriptive Analysis ◽  
Work Productivity ◽  
Validity And Reliability ◽  
Quantitative Descriptive Analysis ◽  
Financial Condition ◽  
Significant Difference ◽  
Business Conditions ◽  
The Right ◽  
The Impact

The Covid-19 outbreak has become a global problem and has caused economicproblems in various sectors including the SME sector. This research was conductedto examine the impact of the Covid-19 pandemic on the business conditions of SMEswhich later can be used by policy makers in determining the right actions toovercome financial problems in the SME sector.This research was conducted in the province of South Kalimantan using primarydata. Sampling was done by purposive sampling with an instrument in the form of aquestionnaire. This study used a sample of 233 respondents. The data analysistechnique was performed using the analysis of the validity and reliability of theinstrument and quantitative descriptive analysis to describe the financial conditionsof SMEs and the affected business / corporate sectors. The results of this study foundthat (1) There was a significant difference to the financial condition of SMEs beforeand after the pandemic, where there was a decrease in gross income (-41.6%) andthe level of profit in the SME sector (-62.8%) in general (2) Some of the impacts ofthe Covid Pandemic -19 regarding the business conditions of SMEs, namely (a)there are still many SMEs that have not been able to sell online, (b) there has beenan increase in raw materials, (c) the majority of SMEs have difficulty obtaining rawmaterials, (d) there is a decrease in motivation and work productivity which issignificant, (e) there are still many SMEs that experience a shortage of cash andmany SMEs are in arrears of liabilities, (f) but the majority of SMEs still believethey will survive and pass the pandemic.

scholarly journals How Cycling is Perceived in Budapest Based on Household Survey Results

2020 ◽  
Author(s):  
Tamás Mátrai ◽  
János Tóth ◽  
Julio Cruz
Keyword(s):  
Raw Materials ◽  
Household Survey ◽  
Spatial Behavior ◽  
Infrastructure Development ◽  
Transportation Mode ◽  
Perceived Safety ◽  
The Past ◽  
Survey Results ◽  
The Right ◽  
The Impact

With the increasing awareness of ecosystem limitation, cycling, as a transportation mode, has been promoted as an approach to preserve our resources of raw materials and encourage healthier habits in our everyday lives.Aiming to gather data about cycling in Budapest and its agglomeration, a random walk based household survey with 1511 individuals was carried out. Two main groups were targeted during the household survey: citizens who have used their bicycle for transportation in the past 30 days (n = 672) and those who are willing to use bicycles given the right circumstances (n = 839). After the general household related questions, the main part of the questionnaire explored cycling behavior through 7 questions. It was possible to value parameters such as cycling impacts in society, cycling infrastructure development and its spatial behavior, perceived safety, morale, safe infrastructure, facilities, cost sensitivity and the impact of dedicated cycling infrastructure in Budapest.

DOES FOREIGN DIRECT INVESTMENT IMPROVE ECONOMIC GROWTH IN CEMAC COUNTRIES?

2013 ◽  
Vol 8 (2) ◽  
Author(s):  
EMMANUEL BRUNO  ONGO NKOA
Keyword(s):  
Economic Growth ◽  
Positive Impact ◽  
Raw Materials ◽  
Research Work ◽  
Growth Theory ◽  
The Past ◽  
The Impact ◽  
Neoclassical Growth Theory ◽  
Neoclassical Growth ◽  
Selection Of

The aim of this research work is to assess the influence of FDI on economic growth in the CEMAC region. The ratio of FDIs in the actual GDP of countries of the CEMAC region has recorded a steady annual increase for the past three decades. Moreover, the high variability of FDI, given the various crises and fluctuations in the prices of raw materials invites us to reflect and question the impact of FDI on growth by studying the case of CEMAC countries. The theoretical analysis is based on the neoclassical growth theory and its extensions. After the selection of a model crafted from Imoudu (2012) and Boreinsztein et al. (1998). The results show that FDI have a positive impact on the growth of the sub-region and these are conveyed by human capital.

scholarly journals DOES WORKING CAPITAL HAS AN IMPACT ON PROFITABILITY OF INDIAN STEEL INDUSTRY

2021 ◽  
Vol 2 (3) ◽  
pp. 10-23
Author(s):  
Dr. Anil K. Bhatt ◽  
Nirmala Shrotriya
Keyword(s):  
Steel Industry ◽  
Raw Materials ◽  
Research Work ◽  
Working Capital ◽  
Excess Amount ◽  
If Current ◽  
The Impact ◽  
Correct Level

Working capital has a major role in day to day business activities. It is simply defined as the excess amount of current assets over current liabilities. Working capital also means the fund which is needed for the operations which are taken place in a firm every day. So working capital is considered as a fund which revolves all the time. This revolving fund consists of continues conversion of cash and raw materials in to inventory, then inventory to sales or debtors and this debtors into cash or investment. The existing Working capital in the company is also commonly known as Net Working Capital or net current assets, is the excess if current assets over currentliabilities. But this is on a particular day i.e., 31st March’s position. While it is important to know whether the company really has correct level of WC which is required to them? For this purpose there is a need to find out the required working capital and its relation with the profitability. Thus, the research work has included measuring the impact of WC on profitability. Further there must be discussions with the accounting experts of the selected 10 steel companies to know what they feel about their desired level and actual level of working capital.

Emotional Reactivity to Visual Content as Revealed by ERP Component Clustering

2015 ◽  
Vol 29 (4) ◽  
pp. 135-146 ◽  
Author(s):  
Miroslaw Wyczesany ◽  
Szczepan J. Grzybowski ◽  
Jan Kaiser
Keyword(s):  
Emotional Reactivity ◽  
Brain Activity ◽  
Affective State ◽  
Occipital Lobe ◽  
Stimulus Onset ◽  
Emotional States ◽  
Neural Basis ◽  
Temporoparietal Junction ◽  
The Right ◽  
The Impact

Abstract. In the study, the neural basis of emotional reactivity was investigated. Reactivity was operationalized as the impact of emotional pictures on the self-reported ongoing affective state. It was used to divide the subjects into high- and low-responders groups. Independent sources of brain activity were identified, localized with the DIPFIT method, and clustered across subjects to analyse the visual evoked potentials to affective pictures. Four of the identified clusters revealed effects of reactivity. The earliest two started about 120 ms from the stimulus onset and were located in the occipital lobe and the right temporoparietal junction. Another two with a latency of 200 ms were found in the orbitofrontal and the right dorsolateral cortices. Additionally, differences in pre-stimulus alpha level over the visual cortex were observed between the groups. The attentional modulation of perceptual processes is proposed as an early source of emotional reactivity, which forms an automatic mechanism of affective control. The role of top-down processes in affective appraisal and, finally, the experience of ongoing emotional states is also discussed.

Piezoelectric β-polymorph formation of new textiles by surface modification with coating process based on interfacial interaction on the conformational variation of poly (vinylidene fluoride) (PVDF) chains

2020 ◽  
Vol 91 (3) ◽  
pp. 31301
Author(s):  
Nabil Chakhchaoui ◽  
Rida Farhan ◽  
Meriem Boutaldat ◽  
Marwane Rouway ◽  
Adil Eddiai ◽  
...  
Keyword(s):  
High Efficiency ◽  
Vinylidene Fluoride ◽  
Research Work ◽  
Research Area ◽  
Interfacial Interaction ◽  
Tetraethyl Orthosilicate ◽  
Poly Vinylidene Fluoride ◽  
Carbon Nanofillers ◽  
The Impact ◽  
Advanced Applications

Novel textiles have received a lot of attention from researchers in the last decade due to some of their unique features. The introduction of intelligent materials into textile structures offers an opportunity to develop multifunctional textiles, such as sensing, reacting, conducting electricity and performing energy conversion operations. In this research work nanocomposite-based highly piezoelectric and electroactive β-phase new textile has been developed using the pad-dry-cure method. The deposition of poly (vinylidene fluoride) (PVDF) − carbon nanofillers (CNF) − tetraethyl orthosilicate (TEOS), Si(OCH2CH3)4 was acquired on a treated textile substrate using coating technique followed by evaporation to transform the passive (non-functional) textile into a dynamic textile with an enhanced piezoelectric β-phase. The aim of the study is the investigation of the impact the coating of textile via piezoelectric nanocomposites based PVDF-CNF (by optimizing piezoelectric crystalline phase). The chemical composition of CT/PVDF-CNC-TEOS textile was detected by qualitative elemental analysis (SEM/EDX). The added of 0.5% of CNF during the process provides material textiles with a piezoelectric β-phase of up to 50% has been measured by FTIR experiments. These results indicated that CNF has high efficiency in transforming the phase α introduced in the unloaded PVDF, to the β-phase in the case of nanocomposites. Consequently, this fabricated new textile exhibits glorious piezoelectric β-phase even with relatively low coating content of PVDF-CNF-TEOS. The study demonstrates that the pad-dry-cure method can potentially be used for the development of piezoelectric nanocomposite-coated wearable new textiles for sensors and energy harvesting applications. We believe that our study may inspire the research area for future advanced applications.

Microstructural and Mechanical Behaviour Evaluation of Mg-Al-Zn Alloy Friction Stir Welded Joint

2020 ◽  
Vol 17 (3) ◽  
pp. 8150-8159
Author(s):  
Kulwant Singh ◽  
Gurbhinder Singh ◽  
Harmeet Singh
Keyword(s):  
Heat Treatment ◽  
Friction Stir Welding ◽  
Magnesium Alloys ◽  
Mechanical Performance ◽  
Fuel Efficiency ◽  
Research Work ◽  
Grain Structure ◽  
Tensile Fracture ◽  
Friction Stir ◽  
The Impact

The weight reduction concept is most effective to reduce the emissions of greenhouse gases from vehicles, which also improves fuel efficiency. Amongst lightweight materials, magnesium alloys are attractive to the automotive sector as a structural material. Welding feasibility of magnesium alloys acts as an influential role in its usage for lightweight prospects. Friction stir welding (FSW) is an appropriate technique as compared to other welding techniques to join magnesium alloys. Field of friction stir welding is emerging in the current scenario. The friction stir welding technique has been selected to weld AZ91 magnesium alloys in the current research work. The microstructure and mechanical characteristics of the produced FSW butt joints have been investigated. Further, the influence of post welding heat treatment (at 260 °C for 1 h) on these properties has also been examined. Post welding heat treatment (PWHT) resulted in the improvement of the grain structure of weld zones which affected the mechanical performance of the joints. After heat treatment, the tensile strength and elongation of the joint increased by 12.6 % and 31.9 % respectively. It is proven that after PWHT, the microhardness of the stir zone reduced and a comparatively smoothened microhardness profile of the FSW joint obtained. No considerable variation in the location of the tensile fracture was witnessed after PWHT. The results show that the impact toughness of the weld joints further decreases after post welding heat treatment.

The Impact of Internal Work Environment on the Retention of Healthcare Providers at Turaif General Hospital

2019 ◽  
Vol 10 (12) ◽  
pp. 1183-1199
Author(s):  
Mohammed Alrouili ◽  
Keyword(s):  
Work Environment ◽  
General Hospital ◽  
Professional Growth ◽  
Healthcare Providers ◽  
Entire Study ◽  
Internal Work ◽  
Research Findings ◽  
Study Population ◽  
The Right ◽  
The Impact

This study attempted to identify the impact of internal work environment on the retention of healthcare providers at Turaif General Hospital in the Kingdom of Saudi Arabia. In particular, the study aimed to identify the dimensions of work circumstances, compensation, and relationship with colleagues, professional growth, and the level of healthcare providers’ retention. In order to achieve the study goals, the researcher used the descriptive analytical approach. The researcher used the questionnaire as the study tool. The study population comprised all the healthcare providers at Turaif General Hospital. Questionnaires were distributed to the entire study sample that consisted of 220 individuals. The number of questionnaires valid for study was 183 questionnaires. The research findings were as follows: the participants’ estimate of the work circumstances dimension was high (3.64), the participants’ estimate of the compensation dimension was moderate (3.32), the participants’ estimate of the relationship with colleagues dimension was high (3.62), the participants’ estimate of the professional growth dimension was weak (2.39), and the participants’ estimate of healthcare providers’ retention level was intermediate (2.75). Accordingly, the researcher’s major recommendations are: the need to create the right atmosphere for personnel in hospitals, the interest of the hospital to provide the appropriate conditions for the staff in terms of the physical and moral aspects for building the work adjustment in the staff, and conducting training courses and educational lectures for personnel in hospitals on how to cope with the work pressures.

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