Possibilities for reusing the waste from the process of Zn-Pb ore beneficiation

2017 ◽  
Vol 18 ◽  
pp. 01008
Author(s):  
Krystian Cichy ◽  
Kornel Tobiczyk ◽  
Arkadiusz Mańka ◽  
Grażyna Pajor ◽  
Cezary ReguŁa
Keyword(s):  
Metal Content ◽  
Laboratory Tests ◽  
Research Work ◽  
Experimental System ◽  
Chemical Characteristics ◽  
Sulfide Concentrates ◽  
The City

This paper discusses the areas of storage, resources, and granulometric and chemical characteristics of old Zn-Pb tailings stored in heaps in the city of Bytom area. It presents the results of laboratory tests for development of the technological flowsheet for transformation of the material into Zn- Pb sulfide concentrates and the results of trials in an experimental system of the beneficiation flowsheet which was developed. In the further part of the paper, the results of the research work on preparation of the tailings with reduced metal content for further use are presented.

scholarly journals Evaluación del cumplimiento de los requisitos establecidos en la norma INEN, en la elaboración artesanal de los bloques de hormigón en el cantón Portoviejo.

2020 ◽  
Vol 4 (2) ◽  
pp. 15
Author(s):  
Erick Alfonso Ortiz Ayovi ◽  
Eddy Fernando Orejuela Ortiz ◽  
Wilter Enrique Ruiz Párraga
Keyword(s):  
Laboratory Tests ◽  
Research Work ◽  
Brick Masonry ◽  
Design Parameters ◽  
The Future ◽  
Concrete Blocks ◽  
Simple Compression ◽  
The City ◽  
Made In

  Después del terremoto que se vivió en Ecuador el pasado 16 de abril del 2016 y que tuvo como epicentro las provincias de Esmeraldas y Manabí, en la ciudad de Portoviejo hubo el colapso de muchas estructuras y edificaciones con lo cual se pudo determinar que uno de los materiales que más falló fue la mampostería de ladrillos y los bloques de hormigón. El presente trabajo investigativo tuvo como fin  evaluar el  cumplimiento de los parámetros necesarios para la fabricación de bloques de hormigón artesanales en la ciudad de Portoviejo, partiendo de los criterios  establecido por el Instituto Ecuatoriano de Normalización (INEN), que permitió establecer  las propiedades físicas y mecánicas de los bloques de hormigón a partir de ensayos de laboratorio, apoyados por la NTE INEN 3066 2016-11, los mismos que consistieron en dimensiones, densidad, absorción, y resistencia a la compresión simple. Este trabajo se desarrolló con la intensión de evaluar los bloques de hormigón que se fabrican en Portoviejo para evitar en un futuro perdida materiales y humanas producidas por algún evento sísmico. Con los resultados de esta investigación se puede establecer condiciones de carácter técnico entre los bloques de hormigón artesanales elaborados en la ciudad de Portoviejo y los parámetros de diseño establecidos por la NTE INEN 3066 2016-11.     PALABRAS CLAVES: bloques de hormigón, ensayos a la compresión simple, absorción y densidad.    Abstract—  With the earthquake that occurred in Ecuador on April 16, 2016 with epicenter in Esmeraldas and Manabí, in Portoviejt's city, there was the collapse of many structures and buildings with which it was achieved that one of the most falling materials was brick masonry and concrete blocks. The purpose of this research work was to evaluate the compliance with the parameters required for the manufacture of artisan concrete blocks in the city of Portoviejo, based on the criteria established by the Ecuadorian Institute for Standardization (INEN), which will establish the properties Physical and mechanical concrete blocks from laboratory tests, supported by NTE INEN 3066 2016-11, which consist of dimensions, density, absorption and resistance to simple compression. This work was evaluated with the intention of evaluating the concrete blocks that are manufactured in Portoviejo to avoid in the future lost materials and humans, produced by some sismic event. With the results of this investigation, technical conditions can be established between the artisanal concrete blocks made in the city of Portoviejo and the design parameters established by NTE INEN 3066 2016-11.    KEYWORDS: Concrete blocks, tests for simple compression, absorption and density.

scholarly journals The Use of GIS Technology to Optimize COVID-19 Vaccine Distribution: A Case Study of the City of Warsaw, Poland

2021 ◽  
Vol 18 (11) ◽  
pp. 5636
Author(s):  
Sylwia Krzysztofowicz ◽  
Katarzyna Osińska-Skotak
Keyword(s):  
Herd Immunity ◽  
Research Work ◽  
Age Groups ◽  
Group Living ◽  
Population Group ◽  
Gis Technology ◽  
Vaccination Site ◽  
Global Challenge ◽  
Vaccine Distribution ◽  
The City

The COVID-19 pandemic is a global challenge, and the key to tackling it is vaccinating a specified percentage of the population to acquire herd immunity. The observed problems with the efficiency of the vaccination campaigns in numerous countries around the world, as well as the approach used at the initial stage of the National Immunization Program in Poland, prompted us to analyse the possibility of using GIS technology to optimize the distribution of vaccines to vaccination sites so as to minimize the period needed to vaccinate individual population groups. The research work was carried out on the example of Warsaw, the capital of Poland and the city with the largest population in the country. The analyses were carried out for the 60–70 and 50–60 age groups, in various approaches and for vaccines of different companies (Moderna, BioNTech, AstraZeneca), used to vaccinate people in Poland. The proposed approach to optimize vaccine distribution uses Thiessen’s tessellation to obtain information on the number of people in a given population group living in the area of each vaccination site, and then to estimate the time needed to vaccinate that group. Compared to the originally used vaccination scenario with limited availability of vaccines, the proposed approach allows practitioners to design fast and efficient distribution scenarios. With the developed methodology, we demonstrated ways to achieve uniform vaccination coverage throughout the city. We anticipate that the proposed approach can be easily automated and broadly applied to various urban settings.

scholarly journals A Field Study on Urban Rail Transits in City of Kuala Lumpur: Passenger Views on Train Noise and Vibration

2015 ◽  
Vol 773-774 ◽  
pp. 839-844 ◽  
Author(s):  
Mohd Idrus bin Mohd Masirin ◽  
Nur Farrina Johari ◽  
Noor Hafiza Nordin ◽  
Abdul Halid Abdullah ◽  
Mohd Isom Azis
Keyword(s):  
Research Work ◽  
Field Research ◽  
Sound Level ◽  
Urban Rail Transit ◽  
Vibration Velocity ◽  
Kuala Lumpur ◽  
The Public ◽  
Urban Rail ◽  
Noise Data ◽  
The City

Malaysia is a fast developing country which thrives on the growth of its population and economy. Kuala Lumpur is the capital of Malaysia with an area of 243 km2 has a population of 1.4 million [1]. From the statistics, the number of passengers using intercity train services in Malaysia in was 187,345,149 in the year 2012 [2]. Comfortability of a service is a major factor that influences the public. The research will be conducted at the City of Kuala Lumpur, PUTRA LRT (Kelana Jaya Line) and MONOREL Line is selected as the main focus of the research. The data collection will be conducted in the train coaches with two parameters. The noise and vibrations in the train coaches will be taken using the Sound Level Meter (NOR118) and Vibration Meter (Movipack 01dB-Steel) respectively. The noise data were obtained from the interior of the train coaches during operation, while the vibrations were obtained from the wall surface of the coach interior. The vibration aspect for this research is more focused on three parameters which are displacement (μm), vibration velocity (mm/s) and vibration frequency (Hz)[7]. Questionnaires were given out to the train passengers in order to obtain public opinions and satisfaction feedbacks relating their experiences on the train coaches. In this paper it also discusses on the outcomes of the field research work conducted and it was found that PUTRA LRT has a lower vibration value when compared to the MONOREL. The public opinion has also showed unanimous agreement to the field observations conducted by the researchers. However, MONOREL records lower noise levels compared to PUTRA LRT which means quieter journey experience to the commuters. It is hoped that this study will enable the operators to enhance their service weaknesses with the public playing a part in improving the urban rail transit in the City of Kuala Lumpur. Keywords:Comfortability,Noise,Vibration,LRT,MONOREL,

scholarly journals Heavy Metal Content in Water of Resko Lake (North-West Poland)

2013 ◽  
Vol 13 ◽  
pp. 279-287 ◽  
Author(s):  
Piotr Daniszewski ◽  
Ryszard Konieczny
Keyword(s):  
Surface Water ◽  
Water Samples ◽  
Metal Content ◽  
Research Work ◽  
Average Concentration ◽  
Permissible Limit ◽  
Toxic Heavy Metals ◽  
Annual Average ◽  
North West ◽  
Annual Average Concentration

The present research work deals with the quantification of toxic heavy metals in the water samples collected from Lake of Resko (North-West Poland). While the annual average concentration of Cadmium was calculated as 0.34 ppm in 2008 of the year and 0.28 ppm in 2009 of the year. The values obtained were found to be below the permissible limit of 2.0 ppm set for inland surface water. While the annual average concentration of Chromium was calculated as 1,75 ppm in 2008 of the year and 1.97 ppm in 2009 of the year. Which was very much above the permissible limit of 0.1 ppm set for inland surface water. The observed annual average concentration of Copper in the water was 0.05 ppm in 2008 of the year and 0.06 ppm in 2009 of the year, which was below the permissible limit of 3.0 ppm set for inland surface water. While the annual average concentration of Mercury was calculated as 0.03 ppm in 2008 of the year and 0.04 ppm in 2009 of the year, which was very much above the maximum limit of 0.01 ppm set for inland surface water. The annual average concentration of Nickel in the water samples was observed to be 2.07 ppm in 2008 of the year and 2.09 ppm in 2009 of the year, which is close to the limit of 3.0 ppm set for inland surface water. The annual average concentration of Pb in the water samples was observed to be 0.07 ppm in 2008 of the year and 0.05 ppm in 2009 of the year, which is above the permissible limit of 0.1 ppm set for inland surface water. The results of the present investigation indicate that the annual average concentration of Zn in water samples was 3.02 ppm in 2008 of the year and 2.74 ppm in 2009 of the year, which is above the permissible limit of 5.0 ppm set for inland surface water.

scholarly journals O Papel do Apoiador Escolar na Educação Inclusiva / The Importance of the School Supporter in Inclusive Education

2021 ◽  
Vol 15 (58) ◽  
pp. 592-600
Author(s):  
Sara Mariza dos Santos ◽  
Kennya De Lima Almeida
Keyword(s):  
Inclusive Education ◽  
School Environment ◽  
School Teacher ◽  
Research Work ◽  
Public And Private ◽  
Educational Networks ◽  
Educational Inclusion ◽  
Random Groups ◽  
The City

Resumo:  A educação inclusiva é conhecida como uma forma de trabalhar com crianças com necessidades especiais no ambiente escolar. Vista de forma mais ampla, ela tem o papel de acolher a diversidade e dar assistência a todos os estudantes, pois o objetivo da inclusão educacional é acabar com a exclusão social. O trabalho de pesquisa tem como objetivo avaliar as dificuldades encontradas pelos professores apoiadores das salas de aula, saber qual o suporte e formação que recebe para atuar. Além disso, a pesquisa possibilita compreender a realidade da inclusão a partir de redes de ensino diferentes, a pública e a privada. A metodologia aplicada incluiu dados da observação da sala de aula no intuito de narrar e analisar o cotidiano do “professor apoiador escolar”. O trabalho foi realizado na Cidade de Salgueiro/PE, e em Umãs/PE, com apoiadores escolares de três escolas, os participantes foram apoiadores escolhidos em turmas aleatórias, em um total de 10 apoiadores de sala de aula.---Inclusive education is known as a way of working with children with special needs in the school environment. Viewed more broadly, it has the role of welcoming diversity and providing assistance to all students, as the objective of educational inclusion is to end social exclusion. The research work aims to assess the difficulties encountered by supportive teachers in the classroom, to know what support and training they receive to act. In addition, the research makes it possible to understand the reality of inclusion from different educational networks, public and private. The methodology applied included data from classroom observation in order to narrate and analyze the daily life of the “supporting school teacher”. The work was carried out in the City of Salgueiro/PE, and in Umãs/PE, with school supporters from three schools, the participants were supporters chosen in random groups, in a total of 10 classroom supporters.

scholarly journals Parâmetros físico-químicos de polpas de fruta produzidas na cidade de Petrolina – PE

2015 ◽  
Vol 10 (4) ◽  
pp. 01 ◽  
Author(s):  
A. C. Honorato ◽  
C. B. R. Dias ◽  
E. B. Souza ◽  
I. R. B. Carvalho ◽  
K. S. M. Sousa
Keyword(s):  
Ascorbic Acid ◽  
Physicochemical Parameters ◽  
Titratable Acidity ◽  
Soluble Solids ◽  
Chemical Characteristics ◽  
Fruit Pulp ◽  
Total Titratable Acidity ◽  
Physical And Chemical ◽  
The City

<p>Este trabalho teve como objetivo avaliar os parâmetros físico-químicos de polpas de fruta produzidas e comercializadas na cidade de Petrolina-PE, tendo como referência a Instrução Normativa nº 1, de 7 jan. 2000, do Ministério da Agricultura que define as características físicas e químicas estabelecendo limites mínimos e máximos específicos para cada polpa de fruta. Foram avaliadas duas marcas (1 e 2) de polpas de abacaxi, cacau, caju, graviola, maracujá e umbu, analisadas quanto aos parâmetros de pH, sólidos solúveis totais (SST), acidez total titulável (ATT), ácido ascórbico, relação SST/ATT e sólidos totais. Os resultados permitem inferir que a marca 2 apresentou qualidade superior na maioria dos parâmetros avaliados quando comparado com a marca 1. Entretanto para alguns sabores de polpa as duas marcas não atenderam os valores padrões. Entre as polpas o único sabor que apresentou os padrões exigidos foi a polpa de caju em ambas as marcas, e a que apresentou resultado de pior qualidade diante dos padrões foi a polpa de maracujá principalmente da marca 1. Dessa forma constata-se que há grandes variações entre as marcas, e entre alguns parâmetros, o que compromete a qualidade das polpas, prejudicando assim o consumidor.</p><p align="center"><strong><em>Physicochemical parameters of fruit pulps produced in Petrolina – PE</em></strong></p><p><strong>Abstract</strong><strong>: </strong>This study aimed to evaluate the physicochemical parameters of fruit pulps produced and marketed in the city of Petrolina-PE, with reference to the Instruction Nº 1 of 7 January 2000 of the Ministry of Agriculture, which defines the physical and chemical characteristics setting minimum and maximum limits specific to each fruit pulp. We evaluated two brands (1 and 2) of pineapple, cocoa, cashew, soursop, passion and umbu fruit pulp, analyzed for pH, total soluble solids (TSS), total titratable acidity (TTA), ascorbic acid, TSS / TTA and total solids parameters. Results show that the brand 2 showed superior in most evaluated parameters when compared to the brand 1. However, for some pulp flavors of both brands did not reached the standards values. Among the pulps, the only flavor that presented the required standards was the cashew pulp in both brands, and presented the results of lower quality on the standards was the passion fruit pulp mainly brand 1. Thus, it appears that there are great variations between brands and between some parameters, which compromises the quality of the pulp, thus impairing the consumer.</p>

scholarly journals Monitoring of Dermatophytosis incidence in domestic dogs and cats in Kharkiv, Ukraine

2019 ◽  
Vol 5 (1) ◽  
pp. 17-19
Author(s):  
G. V. Ponomarenko ◽  
V. L. Kovalenko ◽  
O. V. Ponomarenko ◽  
R. V. Severyn ◽  
A. M. Gontar ◽  
...  
Keyword(s):  
Laboratory Tests ◽  
Trichophyton Mentagrophytes ◽  
Domestic Dogs ◽  
Microsporum Canis ◽  
Diagnostic Studies ◽  
High Level ◽  
Mold And Yeast ◽  
The City ◽  
Mycological Laboratory

The spread of dermatophytosis among animals and humans in the localities of Ukraine in particular in the city of Kharkiv is due to the presence of range of the most susceptible animals. This information mainly concerns dogs and cats that can be affected by dermatophytosis and may be a reservoir of dermatophyte fungus. Particularly important is that domestic dogs and cats represent a significant epidemiological threat to the population. The purpose of the research was to monitor the morbidity of dermatophytosis in domestic dogs and cats in Kharkiv. Diagnostic studies of dermatophytosis morbidity level determination in domestic dogs and cats were performed complexly including the clinical and epizootic data, microscopic and mycological laboratory tests conducted according to generally accepted methods (Kovalenko et al., 2017; Sutton, Fothergill and Rinaldi, 2001). Dermatophytosis was diagnosed among 231 animals in the study of 1,277 domestic dogs kept by the inhabitants of the city of Kharkiv which was in 18.09% of samples. Dermatophytosis was also detected in 615 animals which constitutes 50.25% in the study of 1,124 cats. The cultures of dermatophytosis agent Microsporum canis were isolated from 126 dogs (18.98%) and 110 cats (40.74%). Trichophyton mentagrophytes cultures were isolated from 16 dogs (2.41%) and 16 cats (5.93%). The percentage of isolated cultures of mold and yeast-like fungi in the studies of sick dogs and cats were 38.55% and 22.25% respectively. Obtained results indicate quite high level of the dermatophytosis spreading among domestic dogs and cats in the city of Kharkiv.

scholarly journals Characterization of secondary deposits of columbite-tantalite minerals found in the city of Rorainópolis (RR), Brazil

2020 ◽  
Vol 8 (4) ◽  
pp. 450-468
Author(s):  
Anna Caroline Andrade Pinto ◽  
Tiago Felipe Arruda Maia
Keyword(s):  
Scientific Community ◽  
Research Work ◽  
Geological Mapping ◽  
Mineral Deposits ◽  
X Ray Diffraction ◽  
X Ray ◽  
Source Areas ◽  
The City ◽  
Petrographic Description

Many of the studies about mineral deposits are bringing great information to the scientific community, providing, for example, general characteristics of these deposits, possible source areas and its used in some cases as prospective tools to help in geological mapping. In this way, this study aimed to characterize the alluvial secondary deposits of columbite-tantalite that were found near vicinal 12, about 50km north/northeast of Rorainópolis city, between the BR-174 and BR-210 roads, in the state of Roraima (Brazil), bases on 4 samples that were brought by a resident of the region. To fulfill these objectives, some chemical and mineralogical methods were performed, like: magnetic separation, X-ray diffraction, X-ray fluorescence and petrographic description. The deposits of the region end up being characterized by having a large amount of Fe and Ti (mostly), containing in some places also a large concentration of Niobium and Tantalum. Not all samples have columbite-tantalite, showing that their concentration in some areas of the deposit is quite low. There are samples with less than 1% Nb and Ta and also samples with more than 20% Nb and 6% Ta concentration. These minerals were poorly transported, being identified by the degree of roundness and granulometry of the samples. A weathering cap on some minerals could also be verified. This research work turned out to be relevant, as it provides new data that add to the knowledge of the mineral potential, which has not been fully explored yet.

scholarly journals Photovoltaic effect in Light Emitting Diodes

2016 ◽  
Vol 1 (1) ◽  
pp. 30-36
Author(s):  
K. Remidi ◽  
A. Cheknane ◽  
M. Haddadi
Keyword(s):  
Theoretical Model ◽  
Experimental Work ◽  
Photovoltaic Effect ◽  
Research Work ◽  
Electrical Characterization ◽  
Experimental System ◽  
Photoelectric Effect ◽  
Electrical Characteristics ◽  
Light Emitting

This paper describes an experimental work on the electrical characterization of commercial LED of different colors and their photoelectric effect. A research work has been carried out to develop the experimental measurement in order to show the presence of a photovoltaic effect on LEDs. For this purpose, we measured the electrical characteristics of individual LED and studied their light intensities using a pyranometer EPLEY. This work focused mainly on red, green and yellowLEDs. Moreover, we have implemented an experimental system for the measurement of sensitivity of different LEDs depending on the power of light from a light source. A comparison was made between theoretical model and experimental results.

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