Prediction of Stability and Thermal conductivity of MgO Nanofluids using CCRD Statistical Design Analysis

Magnesium oxide nanopowders were synthesized by chemical reduction method in which sodium hydroxide solution was used as a reducing agent. Magnesium nitrate (MgNO3.6H2O) precursor was used for the synthesis of MgO nanopowders. Solid state characterizations of synthesized nanopowders were carried out by infrared spectroscopy (FTIR) and X-ray diffraction (XRD) techniques. Using two step method, synthesized nanopowders were prepared as nanofluids by adding water and ethylene glycol (55:45). Thermal conductivity measurements of prepared nanofluids were studied using transient hot wire apparatus in which maximum thermal conductivity enhancement was observed in nanofluid. CCRD design has been applied to optimize the performance of nanofluid systems. In this regard, the performance was evaluated by measuring the stability and thermal conductivity ratio based on the critical independent variables such as temperature, particle volume fraction and the pH of the solution. A total of 20 experiments were accomplished for the construction of second-order polynomial equations for both target outputs. All the influential factors, their mutual effects and their quadratic terms were statistically validated by analysis of variance (ANOVA). The optimum stability and thermal conductivity of MgO nanofluids with various temperature, volume fraction and particle fraction were studied and compared with experimental reults. The results revealed that, at increase in particle concentration and pH of nanofluids at certain point would increase thermal conductivity and become stable at nominal temperature.  According to the results, the predicted values were in reasonable agreement with the experimental data as more than 95%  of the variation could be predicted by the CCRD model for thermal conductivity ratio and zeta potential

Developement of Evolution Algorithm for Shop Scheduling problem

Tato diplomová práce je zaměřena na výzkum evolučních algoritmů (EA) v oblasti plánování zakázkové výroby a na vývoj nové strategie za účelem zlepšení výkonu. Sekvenční rovrhovací problem (JSSP) je jedním z nejsložitějších plánovacích problémů a nalezení optimálního řešení je vzhledem ke složitosti velmi obtížné. Byly přezkoumány existující evoluční algoritmy a pro řešení sekvenčního rozvrhovacího problému byl vybrán jeden z široce používaných genetických algoritmů. Pro porovnání efektivnosti EA jsou vygenerovány nejprve Aktivní plány pro pro eta lonové problémy JSSP na základě různých prioritních pravidel . Poté je přezkoumána struktura a hlavní parametry jednoduchého genetického algoritmu (SGA) a na základě toho je v SGA navržena a implementována nová strategie nahrazení (opakovaně použitelná substituční strategie - RSS). Implementace RRS v SGA zlepšuje výsledky a také byl experimentován její dopad na dva různé typy reprezentací chromozomů. Navržený MSGAJO je považován mezi testovanými za nejlepší genetický algoritmus, který dává nejlepší hodnoty promísení pro případy problému JSSP.This thesis is aimed at research of evolution algorithms (EA) in the field of the shop scheduling problems and to develop a new strategy in order to improve the performance. Job shop scheduling problem (JSSP) is one of the most complex scheduling problem and finding the optimal solution is very difficult due to their complexity. Existing evolution algorithms were reviewed and one of the best and widely used genetic algorithm is selected for solving job shop scheduling problem. Active schedules for JSSP were generated based on various dispatching rules with the help of most used problem instances to compare effectiveness of EA. Then the structure and the major parameters of simple genetic algorithm (SGA) is reviewed and based on that a new strategy for replacement (Reusable Replacement Strategy) is proposed and implemented in the SGA. The implementation of RRS in SGA improves the results and also its impact on two different type of chromosome representations were experimented. The developed MSGAJO is concluded to be the best genetic algorithm among tested to give the best makespan values for the JSSP problem instances

Study of Peroperative Mucosal Biopsy in Peptic Ulcer Perforation

BACKGROUND: Previously the etiological factors of peptic ulcer is caused by stress, spicy foods before 1983, after that Warren and Marshall identified the relationship between the H. pylori infection and peptic ulcer. Now it recognized that H. pylori is one of the most common cause of peptic ulcer disease and the prevalence of H. pylori varies with age, socioeconomic status and other associated risk factors, so diagnosing and controlling the H.pylori infection will reduce the mortality and morbidity of the Patient. AIM AND OBJECTIVES: To study the association of H.pylori in patients with perforated peptic ulcer by RUT and HPE and to study the association between other risk factors and H.pylori infection. MATERIALS AND METHODS: About 50 cases of perforated peptic (gastroduodenal) ulcer evaluated and analysed in an emergency basis in General Surgery Department in Coimbatore Medical College and Hospital for a period of between July 2017 to July 2018 are included in this study. Emergency exploratory laparotomy has been performed in all these cases due to peptic ulcer perforation. During intraoperatively, two mucosal biopsies taken from the perforation site and sent for RUT and HPE to detect H.Pylori infection. RESULT: Out of 50 cases of peptic ulcer perforation, 39 cases (78%) turned out to be positive for H.pylori. Out of 50, H.pylori status positive for most of the middle aged persons (21-30 years) – 25.6% and males were commonly affected 87.2%. Acid peptic disease is most commonly asscociated with H.pylori positive patients around 84.6%. Post operatively H.pylori positive patients were put on anti H.pylori treatment. CONCLUSION: There was a high prevalence of H.pylori infection in patients with perforated peptic ulcer. Patient with perforated peptic ulcer gave history of chronic dyspepsia, should be treated with anti H.pylori therapy post operatively to reduce the recurrence and reperforation

Influence of Transferred Arc Plasma Melting Time on the Formation of Phase and Microstructure of Mullite-Zirconia Composite

Transferred arc plasma is an effective and simple technique to synthesis a high temperature reaction ceramic composite material. In this paper, 20 kW transferred arc plasma torch was used to synthesis mullite-zirconia composites through the solid-state reaction of 3:2 mole ratio of ball milled alumina and zircon powders.  Dissociation of zircon in a thermal plasma arc is utilized as to prepare mullite-zirconia composites. The ball milled samples are melted for 3, 6, 9 and 12 minutes in transferred arc plasma torch at 20 kW power level with 10 lpm of argon flow rate and cooled by air. The phase and microstructure of melted samples were determined from X-ray diffraction (XRD) and SEM images. The obtained results shows that the processing time significantly influence on the formation of phase and microstructure of the mullite- zirconia composite

Degradation of telmisartan (TELMA-H) compounds in aqueous solution using non-thermal atmospheric pressure plasma jet

In this study we investigate the degradation of telmisartan (Telma-H) in simulated aqueous solution using non-thermal atmospheric pressure plasma jet (APPJ). Aqueous solution containing Telma-H was treated with APPJ as a function of applied potential and reaction time. The degradation of Telma-H was investigated by means of UV-Visible spectroscopy. Optical emission spectra (OES) of the plasma jet was used to identify the reactive species that contributed to degrade Telma H compounds. The variation of pH and conductivity of the plasma treated Telma H aqueous solution was also measured

Cold Atmospheric Pressure Argon Plasma Jet Assisted Degradation of Malachite Green (MG) Aqueous Solution

The oxidative degradation of cold atmospheric pressure plasma assisted degradation of malachite Green (MG) was investigated in this study. Cold atmospheric pressure plasma assisted MG degradation process was carried out as a function various plasma treatment time (05, 10, and 15 mins). The % of degradation and presence carbon content in the plasma treated MG was examined by UV-Visible spectroscopy (UV-Vis) and total organic carbon (TOC) analyzer. Optical emission spectrometer was used to identify formation of various reactive species during in situ plasma treatment. The higher degradation percentage of 90% was obtained after plasma treatment time of 15 min and value of TOC also found to decreased significantly with increasing plasma treatment time.  Toxicity of the plasma-treated MG aqueous solution samples was also examined by Staphylococcus aureus (S.aureus) bacteria

Functionalization of wool with L-cysteine : process characterization and assessment of antimicrobial activity and cytotoxicity

This investigation reports a new biotechnological process that uses L-cysteine (L-Cys) which provides a permanent, nontoxic and effective antimicrobial effect over wool-based materials. This process is simple and carried out via idespread exhausting methods. Typically, wool fabrics are incubated with L-Cys for 50 min at 60°C in a pH 4.8 acetate buffer solution 25 mM, under mild agitation to give a good absorption rate. The minimal inhibitory concentration (MIC) of L-Cys was evaluated by the NCCLS M07-A6 standard method, and the results showed a good antibacterial activity against S. aureus and K. pneumoniae within the range of 6.0 × 10−3 − 4.8 × 10−2 g/mL [MIC 0.6% (w/v)] and 6.0 × 10−3 − 4.8 × 10−2 g/mL [MIC 0.6% (w/v)], respectively. In addition, the antimicrobial activity of the functionalized wool was assessed by the international standard JIS 1902-2002 showing a good inhibition of bacterial growth for an L-Cys concentration of 1% over the weight of fabric, both against Staphylococcus aureus and Klebsiella pneumoniae. Moreover, the biocidal mechanism was found to be related with the increase of sulfhydryl's groups onto wool fibers, which were quantified by the Ellman's reagent (5,5′-Dithio-bis(2-nitrobenzoic acid) method. The new process is easy to perform, non toxic, preserve wool quality and is a novel biomimetic approach that uses antimicrobial amino acids and may open new avenues for the design of biomedical textiles with a broad range of applications in healthcare.Contract grant sponsor: FCT; contract grant number: PTDC/EBB-BIO/113671/2009.Contract grant sponsor: R and D Unit of Textile and Paper Materials, Faculty of Engineering, University of Beira Interior

Studies on Modification of Surface Properties in Polycarbonate (PC) Film Induced by DC Glow Discharge Plasma

The polycarbonate film (PC) surface was treated using glow discharge low-pressure air plasma. The modified surface was characterized by contact angle, FTIR, XRD, AFM, and XPS analysis. The surface-modified samples were further investigated using T-peel test for technical applications. The surface energy of the sample was estimated by measuring contact angle. The results show that, after plasma treatment, the root mean square (RMS) roughness of PC film was gradually increased with exposure time. Plasma treatment modified the chemical composition of the polymer surface and it made the surface to be highly hydrophilic. It was found that the air plasma treatment increases the polar component of PC film

Influence of operating parameters on surface properties of RF glow discharge oxygen plasma treated TiO2/PET film for biomedical application

In this paper, a thin transparent titania (TiO2) film was coated on the surface of flexible poly(ethylene terephthalate) (PET) film using the sol–gel method. The surface properties of the obtained TiO2/PET film were further improved by RF glow discharge oxygen plasma as a function of exposure time and discharge power. The changes in hydrophilicity of TiO2/PET films were analyzed by contact angle measurements and surface energy. The influence of plasma on the surface of the TiO2/PET films was analyzed by atomic force microscopy (AFM) as well as the change in chemical state and composition that were investigated by X-ray photo electron spectroscopy (XPS). The cytotoxicity of the TiO2/PET films was analyzed using human osteoblast cells and the bacterial eradication behaviors of TiO2/PET films were also evaluated against Staphylococcus bacteria. It was found that the surface roughness and incorporation of oxygen containing polar functional groups of the plasma treated TiO2/PET films increased substantially as compared to the untreated one. Moreover the increased concentration of Ti3 + on the surface of plasma treated TiO2/PET films was due to the transformation of chemical states (Ti4 + → Ti3 +). These morphological and chemical changes are responsible for enhanced hydrophilicity of the TiO2/PET films. Furthermore, the plasma treated TiO2/PET film exhibited no citotoxicity against osteoblast cells and antibacterial activity against Staphylococcus bacteria which can find application in manufacturing of biomedical devices

DESFILE DE LOS BOYS SCOUTS EN LA ALAMEDA DE COLÓN [Material gráfico]

ADQUIRIDA POR EL COLECCIONISTA EN LAS PALMAS G.C.NIÑAS UNIFORMADAS DESFILANDO POR LA ALAMEDA DE COLÓN.Copia digital. Madrid : Ministerio de Educación, Cultura y Deporte. Subdirección General de Coordinación Bibliotecaria, 201