Performance Evaluation of Remanufacturing Systems

Implementation of new environmental legislation and public awareness has increased the responsibility on manufacturers. These responsibilities have forced manufacturers to begin remanufacturing and recycling of their goods after they are disposed or returned by customers. Ever since the introduction of remanufacturing, it has been applied in many industries and sectors. The remanufacturing process involves many uncertainties like time, quantity, and quality of returned products. Returned products are time sensitive products and their value drops with time. Thus, the returned products need to be remanufactured quickly to generate the maximum revenue. Every year millions of electronic products return to the manufacturer. However, only 10% to 20% of the returned products pass through the remanufacturing process, and the remaining products are disposed in the landfills. Uncertainties like failure rate of the servers, buffer capacity and inappropriate preventive maintenance policy would be highly responsible the delays in remanufacturing. In this thesis, a simulation based experimental methodology is used to determine the optimal preventive maintenance frequency and buffer allocation in a remanufacturing line, which will help to reduce the cycle time and increase the profit of the firm. Moreover, an estimated relationship between preventive maintenance frequency and MTBF (Mean Time Between Failure) is presented to determine the best preventive maintenance frequency for any industry. The solution approach is applied to a computer remanufacturing and a cell phone remanufacturing industry. Analysis of variance and regression analysis are performed to denote the influential factors in the remanufacturing line, and optimization is done by using the regression techniques and ANOVA results

નિબંધકાર કાકાસાહેબ કાલેલકરઃ એક અધ્યયન

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Synthesis and Therapeutic activity of some new piperazine Derivatives

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Programming to Transition Psychological Experiments from SuperLab to Matlab

For the past six years, our laboratory has conducted experiments programmed in Superlab, a software package designed exclusively for psychological experiments. Although Superlab has some attractive features, it also has some severe limitations. For example, Superlab cannot read files, meaning that for an experiment in which each participant has a unique stimulus list, a unique program has to be assembled for each participant. For an experiment in which each participant has a unique order of conditions, a unique program with the conditions in that order has to be assembled for each participant. Preparing numerous unique programs provides numerous opportunities for errors. Matlab, with Psychophysics toolbox, permits these limitations to be surmounted so that there need be only one program prepared for an experiment. For example, a general Matlab program can read a file containing the unique stimulus list for each participant, or a table that contains condition orders for all participants. We will describe the program we have devised for a set of classification experiments. We will address some of the problems we have encountered and how we have solved them.https://engagedscholarship.csuohio.edu/u_poster_2018/1046/thumbnail.jp

Effect of storage duration and analyte concentration on measurement of neutral pH clinical chemistry urine analytes

Background: The aim of the study was focused very keenly in measuring the changes in concentration of sodium, potassium and creatinine in urine, stored for 60 days effect of urinary storage duration of clinical chemistry analytes. This study determined whether patient urine samples can be used for day to day urine quality control.Methods: Spot urine samples were collected from left over samples from the admitted patients in various hospital wards. The samples are kept which its pH was unaltered or unspiked and was aliquoted and deep fridged immediately. These aliquots were melted at an incubator temperature of 86 ºC and was analyzed in the analyzer for 60 days and data were collected for checking variations.Results: With the strenous and continious monitoring from the side of the researchers, the researchers had throughly analysed and found that in both the sets almost all of those analysed urine test of pH 5 and analytes remained very much stable for a period of 60 days which could be used for running daily internal quality controls.Conclusions: Patient urine can be used as internal quality control sample for at least 60 days for sodium, potassium and creatinine. During the 60 days period, there is no appreciable degradation of any of the two sets of samples for sodium, potassium and creatinine measurements

Phytochemical Extraction and Antibacterial Studies of Caesalpinia bonducella Seed Extracts

Caesalpinia bonducella (Linn.) Flem. is an Indian herb belonging to Family Caesalpiniaceae. The seeds contain an alkaloid caesalpinine, bitter principles such as bonducin, saponins and other oils. In the present study, antibacterial activities of the extracts were studied by agar well diffusion method. C. bonducella seeds were porously powdered mechanically and were subjected to successive sequential soxhlet extraction using petroleum ether, chloroform, ethanol and water as the solvents. The bacterial cultures Pseudomonas aeruginosa, Shigella dysenteriae, Proteus mirabilis, Staphylococcus aureus and Enterococcus faecalis were selected for the study. Dry powder of each extract was dissolved in 1 ml of 0.5% DMSO solution to get a concentration of 5, 10, 15 and 20 mg/ml. Each extract was checked for antibacterial activity by introducing 100 μl of each extract into triplicate wells. Controls were maintained with respective solvents. Ciprofloxacin (5 mg/ml) was used as standard antibiotic. Results were subjected to analysis of variance. Chloroform extract have showed good antibacterial activity against Proteus mirabilis, Pseudomonas aeruginos

Performance evaluation of the remanufacturing system prone to random failure and repair

Implementation of new environmental legislation and public awareness has increased the responsibility of manufacturers. Remanufacturing has been applied in many industries and sectors since its introduction. However, only 10% to 20% of the returned products pass through the remanufacturing process, and the remaining products are disposed in the landfills. Uncertainties like high failure rates of the servers, buffer capacities, and inappropriate preventive maintenance policies would be responsible for most of the delays in remanufacturing operations. In this paper, a simulation-based experimental methodology is used to determine the optimal preventive maintenance frequency and buffer allocation in a remanufacturing line. Moreover, an estimated relationship between preventive maintenance frequency and Mean Time Between Failure (MTBF), is presented to determine the best preventive maintenance frequency. The solution approach is applied to computer remanufacturing industry. Analysis of variance (ANOVA), and regression analysis are performed to denote the most influential factors to remanufacturing cycle time (performance measures). A case study is used to show the applicability of the modelling approach in assessing and improving the cycle time, and the profit of a remanufacturing line . Managerial insights are highlighted to support managers and decision-makers in their quest for more efficient and smooth operation of the remanufacturing system

Comparison of direct total iron binding capacity by light MgCO3 and heavy MgCO3

Background: The aim of the study is focused to measure TIBC by calculated method (TIBC using the magnesium carbonate- MgCO3 adsorption), measurement of TIBC by calculatory method from automated UIBC and automated Iron measurement. Latter these two values are to be added and would give an additive result of TIBC. The experiment would be performed by using the light MgCO3 powder and the heavy MgCO3 powder and check for any differences in their respective values. Regression analysis, Bland Altman analysis or histogram analysis of TIBC results obtained by calculated methods in patient samples to find correlation between the two methods is being performed.Methods: Samples received for analysis of tests, regardless of patient identification with sample volume serum were used for the study. After complete analysis and reporting of the sample, the leftover serum was used. Serum was kept at room temperature. Then the calculated TIBC from UIBC and the IRON were compared after doing batch calibration for UIBC and lot calibration of Iron.Results: It was found that, this study had positive bias by the usage of the heavy MgCO3 powder. Positive bias in unsaturated iron binding capacity observed by both methods is studied and further investigated using data obtained during the experiment.Conclusions: There is a higher yield of serum obtained with the heavy MgCO3 powder, TIBC calculated from iron and unsaturated iron binding capacity as compared to TIBC measured directly using the light MgCO3 powder

Metamaterial Incorporated Planar Antenna for C-band Application- A Review

Planar antenna has been widely used having an advantage of low weight, ease of fabrication & small size but it also has a disadvantage of having low gain, efficiency &narrow range of bandwidth. To overcome this limitation of narrow bandwidth, a review on microstrip planar antenna using metamaterials has been elaborated in this paper. Further paper describes introduction, basics of metamaterial structures, design of various antenna using metamaterial structures

A donor hemovigilance study: evaluation of adverse reactions to blood donors at tertiary care teaching hospital

Background: Donor hemovigilance is an important aspect of the hemovigilance system and contributes to decrease the blood donor’s complications and improving blood donor safety and functioning of blood bank. Reporting of adverse reactions associated with blood donations has been covered under National blood donor vigilance programme. This study was carried out to estimate the adverse events in blood donors and to promote their safety.Methods: The study was conducted over a period of 6 months, from 1st January 2017 to 30th June 2017 after getting approval from institutional ethics committee at tertiary care teaching hospital. Prior informed consent was obtained and donor confidentiality was ensured. The donors were observed for adverse event during or after donation. For delayed reactions, donors were requested to contact the researcher or designated departmental staff. Data was collected in case record form. Data entry was done in excel 2013 and appropriate Statistical test (chi square) was applied.Results: During study period total 7970 donors were registered, out of which 53.27% donors have donated their blood in blood camps and 46.72% have in blood bank. Incidence of donor reactions was 1.54%. Incidence of adverse reaction was higher at blood camps (58.53%). Authors found highest number of cases of mild vaso vagal type reactions (53%). Other types of reactions observed were painful arm, hematoma, delayed bleeding, tingling and moderate type of vaso vagal reaction.Conclusions: Authors did not find any major serious events like convulsion, thrombophlebitis or arterial puncture during study period. It considers that safety of donors was maintained