The effect of certain biochemical factors on well clogging under suboxic and mildly anoxic conditions

2012 ◽  
Vol 65 (12) ◽  
pp. 2206-2212 ◽  
Author(s):  
M. Dimkić ◽  
M. Pušić ◽  
V. Obradović ◽  
S. Kovačević
Keyword(s):  
Redox Potential ◽  
Hydraulic Resistance ◽  
Iron Concentration ◽  
Research Project ◽  
Anoxic Conditions ◽  
Rate Of Increase ◽  
Well Clogging ◽  
Groundwater Source ◽  
Shed Light

Research conducted at the Belgrade Groundwater Source in Serbia has shown that significant well screen clogging processes take place under reduced oxic and initial anoxic conditions. Criteria for the prevention, or deceleration, of clogging are becoming more relevant to well ageing, compared with classical, mechanical clogging criteria and the permissible entrance velocities derived from them. The research project was later expanded to encompass other alluvial sources, which feature distinct oxic conditions. This paper presents some of the outcomes of this project, which shed light on the correlation between certain important indicators of well screen clogging (such as the redox potential and iron concentration) and the rate of increase in local hydraulic resistance at the wells.

Several natural indicators of radial well ageing at the Belgrade Groundwater Source, part 2

2011 ◽  
Vol 63 (11) ◽  
pp. 2567-2574 ◽  
Author(s):  
M. Dimkić ◽  
M. Pušić ◽  
V. Obradović ◽  
D. Djurić
Keyword(s):  
Population Growth ◽  
Redox Potential ◽  
Microbial Population ◽  
Iron Concentration ◽  
Hydraulic Losses ◽  
Research Outcomes ◽  
Groundwater Source ◽  
Kinetics Of ◽  
Radial Well

From 2005 to 2009, research was conducted at the Belgrade Groundwater Source (BGWS) to investigate the process of clogging of wells with horizontal lateral screens (radial wells). The clogging process was monitored via the kinetics of the increase in hydraulic losses at the laterals. A correlation of this process with the redox potential, the iron concentration in water, and the microbial population growth at the laterals and in their immediate vicinity was established. Research outcomes are presented here from a study of five wells where laterals were replaced between 2006 and 2008. Derived dependencies were later used to define the preferred approach to the installation and maintenance of well laterals at the BGWS. Results contribute to the study of well ageing caused by biochemical clogging.

Friendship Dynamics between Emotions and Trials

2011 ◽  
Vol 16 (1) ◽  
pp. 119-127 ◽  
Author(s):  
Paola Rebughini
Keyword(s):  
Urban Area ◽  
Structural Dynamics ◽  
Job Loss ◽  
Research Project ◽  
The Third ◽  
The City ◽  
Shed Light ◽  
The Way

The aim of this article is to analyze friendship ties and the emotions connected to them in some particular phases of life: periods when subjects are faced with difficult challenges such as mourning, separation, job loss or illness. Under these circumstances, friendship ties and emotions take on exceptional intensity. To investigate these moments I will use the analytical concept of trial and I will outline its heuristic utility in the analysis of friendship ties. The article is based on a research project on the dynamics of friendship relationships among adults conducted in the urban area of the city of Milan. In order to shed light on the dynamics of friendship in difficult moments of life, the article is organized in three sections: in the first part, I will introduce some narratives collected during the research. In the second part, I will shed light on the way that trial phases of life are the periods in which the relation between friendship and emotions becomes more visible, in particular through the way that friendship bonds offer the possibility of narrating and sharing emotions themselves, thus introducing an element of reflexivity. In the third part, I will conclude by underlining the way that this kind of analysis of friendship ties can reveal some more structural dynamics of contemporary individualized society.

scholarly journals Calculation of Hydraulic Resistance in the Case of a Diffuser and a Confuser in a Horizontal Pipe

2021 ◽  
Vol 137 (6) ◽  
pp. 62-64
Author(s):  
A. M. Khurmamatov ◽  
◽  
G. B. Rakhimov ◽  
Keyword(s):  
Hydraulic Resistance ◽  
Pressure Loss ◽  
Head Loss ◽  
Sudden Expansion ◽  
Horizontal Pipe ◽  
Rate Of Increase ◽  
Inner Diameter

The main results of the calculation of the head loss with a smooth expansion and narrowing of the horizontal pipe, which has the following geometric dimensions; - the inner diameter of the pipe with a narrowing of 25 mm and an expansion of 50 mm. The pressure loss of the smooth expansion of the pipe at an oil velocity of 0.2–1.0 m/s has a smooth rate of increase from 0.002 to 0.032 m. With a smooth narrowing of the pipe, the head loss is from 0.0021 to 0.024 m. That, during the movement of oil in a horizontal pipe, the head loss with a sudden expansion is 1.33 times greater than that of a sudden narrowing.

Leaching of Ni and Cu from Mine Wastes (Tailings and Slags) Using Acid Solutions and A. Ferrooxidans

2009 ◽  
Vol 71-73 ◽  
pp. 425-428 ◽  
Author(s):  
Alexa Muñoz ◽  
Denise Bevilaqua ◽  
Oswaldo Garcia Jr.
Keyword(s):  
Redox Potential ◽  
Ferric Iron ◽  
Iron Concentration ◽  
Acid Leaching ◽  
Bacterial Activity ◽  
Mine Wastes ◽  
Bacterial Leaching ◽  
Flotation Tailings ◽  
Acid Consumption ◽  
Leaching Solution

The objective of this work is to evaluate the acidic and biological leaching of tailings containing Ni/Cu from a flotation and smelting plant. Acidithiobacillus ferrooxidans, strain LR, was used for bioleaching at pH 1.8 and chemical controls were run parallel to that. The acidic leaching was done within 48 hours at pH 0.5 and 1.0. In the slag inoculated flasks the redox potential was high (600 mV), thus indicating oxidative bacterial activity, however, the obtained results after 15 days showed only around 13% Ni and 8% Cu extractions, which were not different to those of the controls. For the flotation tailings bioleaching extractions were approximately 45% for Ni and 16% for Cu while differing figures were obtained for the chemical controls. These were 30% and 12% respectively. Here we could observe that the presence of bacterial activity led to a higher solubility of Ni. Acid leaching of slag showed higher nickel and copper extractions: 56% and 24% respectively at pH 0.5 and 21% and 11% at pH 1.0. However, the acid consumption was 320 and 150 Kg/ton of slag, respectively, both much higher than in bacterial assays. These results indicated that Ni and Cu solubilization from the slag is acid dependent no matter the redox potential or ferric iron concentration of the leaching solution. For flotation tailings, acid treatment showed extractions of 23% for Ni and 16% for copper at pH 0.5 and 22% and 28%, respectively at pH 1.0. The acid consumption was also higher: 220 and 120 Kg/ton, at pH 0.5 and 1.0, respectively. Based on own findings we could observe that acid leaching is found to be more effective for slag, though the acid consumption is much higher, while for the flotation tailings, bacterial leaching seems to be the best alternative.

scholarly journals LEX.CH.IT: A CORPUS FOR MICRO-DIACHRONIC LINGUISTIC INVESTIGATIONS OF SWISS NORMATIVE ACTS IN ITALIAN

2019 ◽  
Vol 40 ◽  
pp. 43-65
Author(s):  
Paolo CANAVESE
Keyword(s):  
Research Project ◽  
Academic Interest ◽  
Doctoral Research ◽  
Language Variety ◽  
The Future ◽  
Institutional System ◽  
Shed Light

The aim of this paper is to present LEX.CH.IT, a corpus for micro-diachronic linguistic investigations of Swiss normative acts in Italian. Italian has a peculiar position as an official minority translation language within the Swiss institutional system. Until now, few studies have focused on Swiss legal Italian, but the academic interest has been growing over the last two decades. In order to further expand on research in this field, resources such as corpora are fundamental. This is why LEX.CH.IT has been compiled. This corpus was originally created in the context of a doctoral research project, which will be briefly outlined in this paper. The main goals of the project are to determine whether clarity is a feature of Swiss legislation in Italian, whether there have been relevant evolutions over the last five decades and to assess the role of translation for a clear legislation. In the future, LEX.CH.IT could also be useful for a number of other projects aiming to shed light on the features of this language variety.

scholarly journals Rediscovering Sculptures from Tebtynis at the Museo Egizio in Turin

2017 ◽  
Vol 1 ◽  
Author(s):  
Giorgia Cafici ◽  
Giulia Deotto
Keyword(s):  
Case Studies ◽  
Stylistic Analysis ◽  
Arabic Text ◽  
Research Project ◽  
Ongoing Research ◽  
Content Type ◽  
The Temple ◽  
Shed Light

This article presents three case studies from an ongoing research project on the statues and sculptural fragments from Tebtynis, discovered by Carlo Anti in the years 1930-1936 in the temple dedicated to the god Soknebtynis. Specifically, it examines the following three statues: Alexandria, Graeco-Roman Museum inv. no. 22979, Turin, Museo Egizio S. 18176, and a non-royal statue which one of the authors has recently identified as Turin, Museo Egizio S. 19400+S. 19400/1. The authors combine stylistic analysis with a study of relevant archival records currently kept in Padua and Venice, Italy, to shed light on these sculptures and retrace their post-excavation history. ملخص البحث: يقدم هذا المقال دراسات حالة على ثلاثة قطع آثرية من المشروع البحثى المستمر لتماثيل وبقايا المنحوتات من مدينة تبتونيس "أم البريجات"، التى أكتشفت بواسطة كارلو أنتى خلال أعوام 1930-1936م بالمعبد المكرس للمعبود سوبك نبتونيس. تحديداً ومن خلال فحص التماثيل الثلاث التالية: تمثال من المتحف اليونانى الرومانى بالأسكندرية ويحمل رقم 22979، وأخر من المتحف المصرى بتورينو ويحمل أرقام . S. 18176، وتمثال غير ملكى والذى تم تحديدة مؤخراً من قبل أحد المؤلفين وهو محفوظ أيضاً بالمتحف المصرى بتورينو ويحمل رقم S. 19400+S. 19400/1. تجمع دراسة المؤلفين تضامن التحليل الأسلوبي مع دراسة السجلات الأرشيفية ذات الصلة المحفوظة حاليا في بادوا، إيطاليا، لتسليط الضوء على هذه المنحوتات وتتبع تاريخ ما بعد الحفائر.

scholarly journals European identity: roots and scope

2019 ◽  
pp. 27-34
Author(s):  
Carlos Espaliú Berdud
Keyword(s):  
Human Rights ◽  
International Society ◽  
Research Group ◽  
European Identity ◽  
Special Issue ◽  
Research Project ◽  
Critical Issues ◽  
International University ◽  
Multidisciplinary Perspective ◽  
Shed Light

The current landscape of Europe requires an urgent reflection on whether a European identity exists or not, and on the consequences the answers to this question may hold. For two years, we members of the Research Group on critical issues of contemporary international society of the Faculty of Law of the International University of Catalonia, together with a number of professors from other Spanish and international universities, have attempted to provide answers to these questions. This special issue of Cuadernos Europeos de Deusto is the result of this research project. We have approached the topic from a multidisciplinary perspective, and more specifically Philosophy, History and Law. In particular, we have focused on the roots and scope of the European identity, which, once determined, can shed light on the relations between people and groups of different races, religions, cultures, etc. in Europe. Several of the authors have addressed the issue of human rights, a key element of that European identity.Published online: 27 February 2019

scholarly journals Influence of oxic and anoxic groundwater conditions on occurrence of selected agrochemicals

2019 ◽  
Vol 20 (2) ◽  
pp. 487-498
Author(s):  
Nevena Živančev ◽  
Srđan Kovačević ◽  
Marija Perović ◽  
Aleksandar Čalenić ◽  
Milan Dimkić
Keyword(s):  
Nitrate Concentration ◽  
Drainage System ◽  
The Self ◽  
Anoxic Conditions ◽  
Groundwater Samples ◽  
Alluvial Groundwater ◽  
The Republic ◽  
Groundwater Source ◽  
Agricultural Areas ◽  
Surface And Groundwater

Abstract The occurrence and mitigation of selected pesticides and nitrates in surface and groundwater samples from two alluvions in the Republic of Serbia are investigated in this study. The influence of aquifer conditions on the degradation processes of pesticides and nitrates is considered as a potential removal mechanism of compound residues in alluvial groundwater. Nitrate concentration was analyzed in 144 groundwater samples in the Kovin-Dubovac drainage system and 63 samples at the Ključ groundwater source. The occurrence of 15 pesticides was monitored in groundwater in a total of 34 samples in the Kovin-Dubovac area and 14 samples at the Ključ groundwater source. Concentrations of selected pesticides and nitrates were monitored in eight samples from the Danube in the Kovin-Dubovac area and 15 samples from Velika Morava at the Ključ groundwater source. Both selected locations are agricultural areas. Results show that concentrations of nitrates (NO3−) are much higher in oxic groundwater conditions compared with concentrations in typical anoxic conditions. The opposite is the case for the concentration of pesticides that occurred in surface and groundwater samples. These results are very important for a better understanding of the self-purification potential of alluvial aquifers and assessment of aquifer condition influence, especially oxic or anoxic conditions, on the occurrence and mitigation of selected agrochemical residues in groundwaters.

Sign in / Sign up

Export Citation Format

Share Document