Numerical Simulation of Compression Ignition Diesel Injection (CIDI) to investigate Performance parameters

This paper describes the requirement of the Numerical simulation of compression ignition diesel injection by the use of computer language and it also compares the performance parameter for the biodiesel such as jatropha and karanja. The Engine test was carried out in 512 Army base workshops for the experimental validations. It was carried out on SAJ dynamometer which was installed in Engine test house for testing of Engines. Performance parameters such as Brake power, Brake Torque, Mechanical efficiency, Thermal Efficiency, Pressure vs Crank angle and Heat release Rate vs Crank Angle was taken from the Engine test house. The Program code for the Performance parameter of Engine was developed in C++ language. Then the simulation was carried out. The simulation results were compared and analyzed with the experimental results. The final results was effective for compression ignition diesel injection. As we know that today’s world is approaching towards computer simulated results, so the numerically simulated results will save time and money for engine testing house. Likewise we can approach towards numerical simulation for various types of Engines

Large Miscibility Gap in the Ba(Mn_xFe_{1-x})2As2 System

The compounds BaMn2As2 and BaFe2As2 both crystallize in the body-centered-tetragonal ThCr2Si2-type (122-type) structure at room temperature but exhibit quite different unit cell volumes and very different magnetic and electronic transport properties. Evidently reflecting these disparities, we have discovered a large miscibility gap in the system Ba(Mn_xFe_{1-x})2As2. Rietveld refinements of powder x-ray diffraction (XRD) measurements on samples slow-cooled from 1000 C to room temperature (RT) reveal a two-phase mixture of BaMn2As2 and Ba(Mn_{0.12}Fe_{0.88})2As2 phases together with impurity phases for x = 0.2, 0.4, 0.5, 0.6 and 0.8. We infer that there exists a miscibility gap in this system at 300 K with composition limits 0.12 < x < 1. For samples quenched from 1000 C to 77 K, the refinements of RT XRD data indicate that the miscibility gap at RT narrows at 1000 C to 0.2 < x < 0.8. Samples with x=0.4, 0.5 and 0.6 quenched from 1100-1400 C to 77 K contain a single 122-type phase together with significant amounts of Fe_{1-x}Mn_xAs and FeAs2 impurity phases. These results indicate that the system is not a pseudo-binary system over the whole composition range and that the 122-type phase has a significant homogeneity range at these temperatures. Magnetic susceptibility, electrical resistivity and heat capacity measurements versus temperature of the single-phase quenched polycrystalline samples with x = 0.2 and 0.8 and for lightly doped BaMn2As2 crystals are reported.Comment: 14 pages, 16 figures, 3 tables; published versio

Outcome of substitutional urethroplasty by using dorsal onlay buccal mucosal graft: our experience of 10 years

Background: The term urethral stricture is anterior urethral disease, or a scarring process involving the spongy erectile tissue of the corpus spongiosum. Methods: Total 127 patients were included in the study. Patient selection criteria for urethroplasty by using buccal mucosal graft was length of stricture more than 2 cm, deep spongiofibrosis, failed optical urethrotomy for 3 times, adequate oral hygiene and proper buccal mucosa. Results: Length of stricture varied from 3.2 to 14 cm. In first postoperative week, 20.47% (n=26) patients developed minor wound infection culture negative seroma formation in stitch line in the skin. Donor site complications like eating and drinking difficulty, dysguesia, pain, sensitivity, speaking disorders were not found in any patient while oral tightness was noted in 43.30% (n=55) of patients. On postoperative follow-up mean peak urinary flow rate (Qmax) was 28.0 ml/sec (range 20.0-30.6 ml/sec). After a mean follow-up of 8.8 months range (1 month to 33 months) overall success rate was 90.55% (n=115). Conclusions: Buccal mucosa is an excellent graft material for substitution free graft urethroplasty in case of long anterior urethral stricture with excellent success rate. Success rate of dorsal onlay substitution free buccal mucosal graft urethroplasty is affected by length of stricture and aetiology of strictures. Lichen sclerosus having moderate success rate of urethroplasty and higher rate of complication and failure rate in 1-stage buccal mucosal urethroplasty and can be considered for two stage urethroplasty in case of very long stricture of anterior urethra of lichen sclerosus origin

Estimation of leakage power and delay in CMOS circuits using parametric variation

SummaryWith the advent of deep-submicron technologies, leakage power dissipation is a major concern for scaling down portable devices that have burst-mode type integrated circuits. In this paper leakage reduction technique HTLCT (High Threshold Leakage Control Transistor) is discussed. Using high threshold transistors at the place of low threshold leakage control transistors, result in more leakage power reduction as compared to LCT (leakage control transistor) technique but at the scarifies of area and delay. Further, analysis of effect of parametric variation on leakage current and propagation delay in CMOS circuits is performed. It is found that the leakage power dissipation increases with increasing temperature, supply voltage and aspect ratio. However, opposite pattern is noticed for the propagation delay. Leakage power dissipation for LCT NAND gate increases up to 14.32%, 6.43% and 36.21% and delay decreases by 22.5%, 42% and 9% for variation of temperature, supply voltage and aspect ratio. Maximum peak of equivalent output noise is obtained as 127.531nV/Sqrt(Hz) at 400mHz

Microbial dissolution of a low grade Indian chalcopyrite ore using mixed culture of Mesophiles

An enriched culture of mesophiles namely, Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans derived from mine water of Malanjhkhand Copper Project (MCP), India in the ratio of 4:1, and adapted on 5%(w/v) ore at 35oC was used for the bioleaching of a low grade chalcopyrite ore (0.27% Cu). Optimum copper recovery of 91% was achieved at 1.5pH and 10% (w/v) pulp density in 30days using <50μm particles. Copper recovery decreased to 82% when pH was raised to 2.5 under similar conditions. Higher copper recovery at pH 1.5 may be attributed to the improved bacterial activity (7.0x108 cells/mL), higher redox potential (666mV) and formation of minimum amount of hydronium jarosite, which was prominent at higher pH. Copper recovery was 41.2% in sterile control leaching conditions at 1.5pH. However, unadapted bacterial consortium yielded copper recovery of 69.4% only in 30 days at pH 1.5 under the above conditions. Higher metal recovery with adapted mixed culture may be attributed to increased rate of iron bio-oxidation. The biorecovery of copper from the MCP lean grade ore appeared to follow direct as well as indirect mechanism

Comparison of real time PCR with phenotypic methods in bronchoalveolar lavage in diagnosis of sputum smear negative pulmonary tuberculosis patients

Background: Early diagnosis of pulmonary tuberculosis is of utmost importance for proper control of the disease in the patient. Diagnosis of pulmonary tuberculosis is usually by acid fast bacilli (AFB) smear examination and culture Mycobacterium tuberculosis (MTB). In this study, we have employed polymerase chain reaction (PCR) for MTB in bronchoalveolar lavage (BAL) along with AFB smear and culture MTB for early diagnosis of pulmonary tuberculosis.Methods: A prospective observational study was conducted in the Department of Pulmonary Medicine, Era’s Lucknow medical college and Hospital, Lucknow over a period of two years. A total of 123 previously treated cases of pulmonary tuberculosis were enrolled for the study whose two sputum smear samples were negative for AFB. These patients underwent fibreoptic bronchoscopy and BAL was obtained which was sent for AFB smear, culture MTB and PCR for MTB.Results: The examination of BAL revealed the highest sensitivity for culture MTB at 87.4% followed by PCR for MTB at 73.8% and then AFB smear at 61.2%. PCR for MTB helped in diagnosing an additional 12% patients of pulmonary tuberculosis which were negative on AFB smear and an additional 6.8% patients which were negative on culture MTB.Conclusions: PCR for MTB is useful in making an early diagnosis of pulmonary tuberculosis especially in paucibacillary cases negative on AFB smear and also in some culture MTB negative patients