The mining industry has been associated with environmental pollution throughout the ages. Old abandoned mines are of particular concern due to the lack of remediation and monitoring of the pollution. The abandoned Edendale Lead Mine in Tshwane, South Africa, was in operation from the 1980’s until 1938 and mined primarily galena for the lead content, although some silver was also recovered in the early years. The mine was decommissioned before environmental legislation in South Africa, namely the National Environmental Management Act 107 of 1998 and the Minerals and Petroleum Resources Development Act 28 of 2002, required the mitigation of environmental impacts associated with mining. Consequently, the environmental effects of Edendale Lead Mine have not been determined. This study is aimed at establishing the source, extent and magnitude of environmental pollution associated with metal contamination from mining operations in the area. Such investigation is of particular interest as there are two schools in the area, namely the Edendale Primary and High School, and the mine site is located immediately adjacent to the Edendalespruit. Furthermore, there are numerous farms and some private residences in the area that rely on borehole water that may potentially be polluted. The ore at Edendale Lead Mine was mined from a hydrothermal deposit, with irregularly disseminated argentiferous galena being the only ore mineral of importance. Two mineralisation stages can be recognised from material available on waste rock dumps, i.e. an intensely fragmented and strongly silicified breccia and a carbonate-dominated breccia with minor pyrite. The galena is restricted to the first mineralisation stage. Water and solid samples were collected from the mine site and from the surrounding area. Through ion chromatography, Inductively Coupled Plasma - Optical Emission Spectrometry (ICP-OES) and Inductively Coupled Plasma - Mass Spectrometry (ICP-MS) analysis, the water of the area is found to be of good quality according to the South African Department of Water Affairs and Forestry Domestic Water Guidelines. The main concern is the presence of hazardous concentrations of lead in the Edendalespruit below the old plant site and in a pit near shaft one; determined to be from the abundance of relatively soluble anglesite (PbSO4) and susannite/leadhillite (Pb4(SO4)(CO3)2(OH)2) in the slag heap and the waste rock dump. Solid samples were mineralogically and chemically analysed using X-Ray Powder Diffraction (XRD) and X-Ray Fluorescence Spectrometry (XRF), which determined the soil to be enriched in lead, zinc, and copper. The lead, zinc and copper are from secondary minerals of galena, sphalerite and chalcopyrite, respectively. Metal mobility and availability was found to be limited through high soil pH conditions, which encourage metal-carbonate precipitation reactions and absorption by iron oxides and hydroxides. However, the high concentrations of lead in the soil are of considerable concern due to its toxicity and the number of people at risk, namely at the Edendale Primary and High Schools as well as users of the Edendalespruit and local ground water sources. The soil lead levels exceed the European Union target and intervention standards, therefore, requiring immediate mitigation and remediation measures. Recommendations for remediation and prevention measures may include the removal of the slag heap at the old mine site and the use of phytoremediation. / Prof. J.M. Huizenga Prof. J. Gutzmer Mr. H. Coetzee

Understanding how technology usage influences performance in the inside sales industry has become an important issue for practitioners. Yet, there is a dearth of literature in this area. Inside sales are sales that are performed remotely using the phone or Internet technologies. Leads (i.e., potential customers) are the life-blood of any inside sales setting, and their effective management is crucial for business success. Lead management systems are information technology (IT) tools designed to automate and support effective lead management. This study developed a conceptual model based on the Technology-Task-Fit (TTF) theory, capturing the impact of lead management systems on inside sales performance through the following mediating mechanisms: task characteristics (call productivity and effort on lead follow-up), selling behaviour (adaptive selling) and salesperson characteristics (salesperson’s competency). To validate this model, we conducted an empirical study with 108 responses collected from sales managers and decision makers. Using PLS-SEM for the analysis, our findings show that the use of lead management systems affects inside sales performance via improving salespeople’s adaptive selling, effort on lead follow-up and competency. The findings of this study contributes to the inside sales literature, and also educate practitioners of the key enablers of inside sales performance and technology usage approaches to the inside sales process.

M.Sc. (Geography and Environmental Management) / Saldanha forms part of the heart of the Western Cape and is an integral part of the economic and social well being of South Africa. The recent development of the Namakwa Sands Smelter and the proposed Saldanha Steel Project indicate a possible new phase of industrial growth in the Saldanha area. The evolution of man into beings who are more environmentally aware and the proclamation of more environmentally related legislation, should integrate well with this development. These factors should ensure that companies and institutions implement better pollution control and management. In this study lead pollution caused by the handling and storing of lead concentrate for export purposes in Saldanha Bay, is investigated. The Small Bay area was identified as the area likely to be most polluted and this study concentrated on the pollution in this specific area. The lead pollution was measured for a certain period by monitoring lead concentrations in samples of biological material (black mussels), soil, sediment and dust. From the results the following conclusions are made. Lead concentrations in biological material in the Small Bay area remained constant with no real increase or decrease. Lead concentrations in the soil samples on the north easterly side of Small Bay showed a definite decrease during the monitoring period. Lead concentrations in the sediments of the Small Bay area indicate a decrease during the monitoring period. Lead concentrations in dust collected on the eastern side of Small Bay remained constant during the monitoring period. Lead concentrations in dust collected on the north eastern side showed a decrease. In general, based on the above results obtained, it can be concluded that lead pollution in the Small Bay area of Saldanha decreased during the monitoring period. Lead concentrations in the biological material and dust that did not show a decrease, remained constant i.e. did not worsen.

Syfte: “Studiens syfte är att undersöka vad som förklarar svenska onoterade företags benägenhet att lämna in sin årsredovisning i ett tidigt eller sent skede”.   Metod: I denna kvantitativa studie har sekundärdata samlats in från databasen Retriever. För att uppnå studiens syfte används multivariata regressionsanalyser med lead time och i tid/sen som beroende variabler och lönsamhet, ålder, storlek, revision, skuldsättning, bokslutsmånad samt bransch som oberoende variabler.   Resultat och Slutsats: Resultaten visar på ett negativt signifikant samband mellan lead time och lönsamhet. Sambandet mellan lead time och företagets bokslutsmånad var positivt och signifikant. Företagens val att ha revisor visade sig även det ha ett positivt signifikant samband med lead time, vilket innebär att företag med revisor kommer att lämna in sin årsredovisning senare än företag utan revisor. Det finns däremot inget som tyder på att ha en revisor eller inte påverkar huruvida företag lämnar i tid eller inte.   Bidrag: Studien har bidragit till forskningsområdet kring aktualitet dels genom att utföra studien i Sverige och dels genom att studera onoterade företag. Detta har medfört att en variabel som inte tidigare har studerats, företagets val att ha revisor eller inte, har kunnat inkluderas. Studien bidrar även till de senaste årens debatt kring tidsgränsen för hur sent årsredovisningar ska få lämnas in.   Förslag till vidare forskning: Ett förslag till vidare forskning är att studera om årsredovisningars aktualitet förändrades i och med avskaffandet av revisionsplikten. Det hade även varit intressant att utföra en liknande studie med longitudinell design där flera år undersöks för att kunna fastställa orsaksriktningen mellan variablerna. / Aim: “The aim of this study is to examine what explains Swedish unlisted companies’ tendency to file their annual reports in an early or late period”.   Method: In this quantitative study secondary data is obtained from the database Retriever. To achieve the aim of this study multivariate regression analyses are used with lead time and in time/late as the dependent variables and profitability, age, size, audit, leverage, fiscal year-end and sector as independent variables.   Results and Conclusions: The results show a negative relationship between lead time and profitability. The relationship between lead time and company fiscal year-end was positive and significant. If a company have chosen to have an auditor is shown to have a positive significant relationship with lead time, this mean that companies with an auditor will file their annual reports later than companies without an auditor. There is on the other hand no indications that having an auditor or not will affect whether the company file on time or not.   Contributions: This study has contributed to the field of research of timeliness partly by performing the study in Sweden and partly by studying unlisted companies. This resulted in the inclusion of a variable that takes into account if the company has an auditor or not, which has not been studied before. The study also contributes to previous years debate about the time allowed for companies to file their annual reports.   Suggestions for future research: A suggestion for future research is to study if the timeliness of annual reports changed as a result of the abolition of the audit obligation. It would also be interesting to conduct a similar study with a longitudinal design where more than one year is reviewed so that the causal direction of the variables can be determined.

Lead's uptake on magnetite has been quantitatively evaluated in the present study at a temperature of 200°C and pH of 8.5 with lead concentrations ranging from 5 ppm to175 ppm by equilibrium adsorption isotherms. The pH independent sorption behavior suggested lead sorption due to pH independent permanent charge through weak electrostatic, non-specific attraction where cations are sorbed on the cation exchange sites. The permanent negative charge could be a consequence of lead substitution which is supported by increase in the lattice parameter values from the X-ray diffraction (XRD) results. Differential scanning calorimetry (DSC/TGA) results showed an increase of exothermic (magnetite to maghemite transformation) peak indicating substitution of lead ions due to which there is retardation in the phase transformation. Presence of outer sphere complexes and physical sorption is further supported by Fourier transformed infrared spectroscopy (FTIR). None of the results suggested chemisorption of lead on magnetite.

Philosophiae Doctor - PhD / The organic-inorganic hybrid perovskites such as methyl ammonium lead iodide (MAPbI3) or mixed halide MAPbI3-xClx (x is usually very small) have emerged as an interesting class of semiconductor materials for their application in photovoltaic (PV) and other semiconducting devices. A fast rise in PCE of this material observed in just under a decade from 3.8% in 2009 to over 25.2% recently is highly unique compared to other established PV technologies such as c-Si, GaAs, and CdTe. The high efficiency of perovskites solar cells has been attributed to its excellent optical and electronic properties. Perovskites thin film solar cells are usually deposited via spin coating, vacuum thermal evaporation, and chemical vapour deposition (CVD).

This research work is dealing with impact and size of the thermoelectric that may influence DC circuits. Main part of this thesis is to build experimental equipment for measurement of the thermoelectric and following usage this equipment for detection of the size the thermoelectric voltage for lead and lead-free solders. The theoretical part of this work deals with creation and usage of the thermoelectric in electrical engineering industry. In this particular part of this work is an example how the thermoelectric influence DC circuits. Then I describe thermoelectric generation from the motherboard to the die. The practical part of this thesis is focused on the development of the equipment for measuring of the thermoelectric of different types of materials. The Thermoelectric has been measured on two types of the lead, six types lead-free solders and on four types of the thermocouple wires. It has been measured within the range from 0°C to 80°C. In the end of this work is summary, where is reviewed witch of solders is the best for an applications affected by the thermoelectric.

Business-to-business (B2B) organizations are facing challenges related to complex sales cycles and increasing competition, resulting in more value-driven sales processes and a holistic ecosystem for the B2B marketplace. Recent studies have acknowledged the lack of research on inside sales and sales development in B2B organizations. Scholars point at the increasing importance of inside sales due to changes in the environment and increasing customer demands, which has resulted in the development of digital sales processes within companies. In this study, we have examined the early phase of the sales process referred to as customer acquisition, which is an important part for companies to do business and be profitable over time. In customer acquisition, lead generation and lead management are two central phenomena including generating potential customers and managing them in an adequate way. In this study, where we are writing on commission for Tele2 IoT, our aim was to develop recommendations for how they can improve their conversion rate and sales performance by asking; “How can B2B companies work with sales development processes and lead generation to improve their sales performance?” Based on a literature review of previous studies on sales processes, Internet of Things, and content marketing, we developed an exploratory and qualitative research design, where data was collected through twelve semi-structured interviews with respondents from the case company. Our empirical findings present how the development of a separate unit for Sales Development in Tele2 IoT can be a solution for handling the current challenges for lead generation and lead management. A dedicated Sales Development Representative (SDR) can be responsible for the early phase of the sales process before a Sales Manager takes over. This would include responsibility for lead generation, qualification, and follow-up to ensure that the qualified leads are timely managed. We demonstrate a model that conceptualizes how companies in a highly competitive business environment can initiate a dedicated function working with customer acquisition practices, which we refer to as Sales Development. In our model, we emphasize how three different channels for attracting and managing leads must be considered: 1) outbound lead generation, 2) inbound lead generation and 3) marketing automated lead generation, to improve sales performance. Based on these findings, we propose iterative customer acquisition processes where communication, documentation and cooperation are at its core. Finally, we propose a framework with reflective questions for managers and organizations to take into consideration when implementing Sales Development into their business. The study primarily contributes to the scarce research field of inside sales, where we encourage practitioners and academia to apply our model and utilize quantitative data measures to understand how a Sales Development configuration can improve lead generation within different industries.

Driving piles constitute a large portion of the high-capacity foundations used today. They transfer structural loads to deep bearing strata when adequate surficial soils are not available. The mechanisms required to install these piles generally consist of a hammer, hammer lead, a crane, and various support rigging. This study focused on lead sections, specifically, one which was manufactured by Berminghammer Foundation Equipment, Inc. The dimensions and strength of a lead section must be capable of supporting both the pile driving hammer and the longest anticipated pile for a given site. The strength of the section must be capable of withstanding hundreds of tons in compression and bending. If the lead is operated in a batter, (tilted forward, backward, or sideways) the weight of the hammer and pile causes much more bending than the vertical orientation. The cross-section details for these long steel sections vary from design to design but usually incorporate some form of bolt group, pins, and steel alignment dowels. This thesis focuses on the design, modeling, and testing of such a connection. The motivation of the study stems from a company-wide incentive to standardize the connections used to splice the Berminghammer C15-series lead section. In an effort to verify a proposed connection design, Berminghammer Foundation Engineering solicited the University of South Florida to test a full-sized lead section to failure, while monitoring the splice-connection performance.

Around the world, women are subject to an earlier incidence of cataracts, have a higher risk for cataracts, and also have a higher risk for other vision-related problems than men. Previous research has indicated an association between endogenous lead stored in long bones and cataracts in men over 60 years of age; however, a similar study in women did not reveal an association. This case control study was conducted to investigate whether perimenopausal mobilization of endogenous lead serves as a possible causative factor for women's generalized vision issues and cataract incidence in particular. Secondary data were gathered from 1,416 women aged 40 to 55 years of age from the 2005-2006 and 2007-2008 National Health and Nutrition Examination Surveys. Variables of interest included vision-related issues, cataract surgeries, bone density data, blood lead levels, and markers of lead mobilization. The results of the logistic regression analysis in the absence of confounders (OR = 1.50, 95% CI [1.08, 2.09]) indicated that endogenous lead is a possible causative factor for the low-level vision problems women experience during their perimenopausal years. Chi-square analysis of mobilized lead was also associated with cataract surgeries, p < .05. This appears to be the first report of a possible association between lead and cataracts in women and highlights the need for women to be studied in the context of their biology when their clinical results differ from those of men. These results should engender positive social change initiatives to minimize women's perimenopausal exposure to endogenous lead. Recommendations for further research include a case control study, which includes plasma lead levels, and a longitudinal study.