54 research outputs found
Enhancement of Solubilization (PAHs/Water) & Rheological Behavior at the Interfaces (Air, Oil/Water) in Presence of Surfactants & Additives
No full textSolubilization of two immiscible phases can be achieved with the help of additives such as surfactants as it has wide range of applications in many industries. In order to have better solubilization the rheological behaviour of additive added interface plays a critical role. In this thesis solubilization of naphthalene, a double ringed PAH and anthracene, a triple ringed PAH, in the micellar solution of cationic surfactant CTAB has been studied in order to remove PAHs from contaminated soil and ground water. Effect of three electrolytes NaCl, Na2So4 and CaCl2 on the solubilization of naphthalene and anthracene as additives in the presence of cationic surfactant CTAB is also examined. Different physicochemical properties such as critical micelle concentration (CMC), molar solubilization ratio (MSR) and partition coefficient (Km) have been estimated for the cationic surfactant and cationic surfactant with different electrolyte solutions. The cationic surfactant system showed a synergetic behaviour and a maximum synergism was observed for the cationic surfactant in the presence of higher valence counter ion electrolyte. The synergism of CTAB with electrolyte is also confirmed by 1D 1H NMR study. The rheology at air/water and oil/water interface has been presented using cationic single chain surfactant CTAB, double chain cationic surfactant DDAB, non-ionic surfactant IGEPAL CO-630, anionic surfactant SDBS and TiO2 nanoparticle of size 21 nm. In addition to these rheology studies for surfactant mixture of DDAB & IGEPAL CO 630, CTAB in presence of NaCl and mixture of SDBS with TiO2 has been studied extensively at air/water and oil/water interfaces. Additives like electrolyte and nanoparticle are used in order to reduce the consumption of costly surfactant as well as to reduce their environmental impact. Synergism was observed for all the mixed system but SDBS with TiO2 nanoparticle showed more stable oil/water interface by reducing the viscosity and linear viscoelastic parameters at the interface
Halide double perovskite-based efficient mechanical energy harvester and storage devices for self-charging power unit
No full textWith the rapid development of portable/wearable electronic devices, the demand for highly efficient and sustainable self-powered systems to support their off-grid operation has risen considerably. Recently, metal halide perovskites (MHPs) have been suggested as promising materials for energy harvesting and storage devices because of their excellent optoelectronic, ferro/piezoelectric, and ion migration properties. However, the high toxicity and poor physicochemical stability of MHPs hamper their practical application. Herein, for the first time, the potential of methylammonium tin halide (MA2SnX6; X = Cl, Br, and I) double perovskite thin films for high efficiency self-charging power units (SPUs) is elucidated by virtue of their high stability in air. To this end, the integration of an MA2SnCl6-based piezoelectric nanogenerator (PENG) with a lithium metal battery (LMB), which also uses an MA2SnCl6-based thin film as the cathode, is demonstrated. The MA2SnCl6-based PENG exhibited a high output power density of 7.33 mu W cm-2 and an excellent mechanical durability. Furthermore, MA2SnCl6 as a cathode in LMB recorded the highest specific capacity of 589.98 mAh g-1. A 1 nm-thick Al2O3 coating on the MA2SnCl6 surface improved the capacity retention from 16.9 % to 75.1 % for 100 cycles, indicating its stable performance. The MA2SnCl6-based LMB is charged by the MA2SnCl6-based PENG and utilized as an SPU for operating various small-scale electronics (humidity meter, calculator, and LED). This work not only demonstrates the feasibility of MHPs toward high-capacity batteries and energy harvesters but also provides insights into the general design principles of MHP-based devices.
Development of transition metal dichalcogenide based quantum dots for light emitting diodes
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Content Based Image Retrieval System Using Integrated Feature Extraction Approach
No full textThis article implemented an efficient content-based image retrieval (CBIR) systemusing integrated feature extraction approach where spatial dependence matrix (SDM) isutilized to extract the texture features from the given images while translation invariantdiscrete wavelet transform(TIDWT) employed for low-level feature extraction. Further,this approach considered Tanimoto distance for showing the effectiveness of proposedhybrid CBIR system. Extensive experimental analysis discloses that proposed hybridCBIR system improves efficiency tremendously over conventional CBIR systems
THERAPEUTIC EFFICACY OF LEVONORGESTREL INTRAUTERINE SYSTEM AS AN ALTERNATIVE TO HYSTERECTOMY FOR MANAGEMENT OF HEAVY MENSTRUAL BLEEDING IN PERIMENOPAUSAL WOMEN
No full text Objective: This prospective observational study has been conducted to find out the efficacy and patient satisfaction of levonorgestrel intrauterine system (LNG-IUS), and it was compared with results of hysterectomy in perimenopausal Indian women with heavy menstrual bleeding (HMB).Methods: It was a prospective study conducted on 135 cases after taking consent. Patients were inserted with LNG-IUS, and the outcome in terms of further bleeding and quality of life was compared to that of hysterectomy.Results and Conclusion: Levonogestrol containing-IUS is a highly effective treatment of HMB in perimenopausal women. It is a safe, effective, and quality of life after treatment makes it a good alternative to hysterectomy for HMB.</jats:p
A secure and efficient message authentication protocol for vehicular Ad hoc Networks with privacy preservation(MAPWPP)
No full textEvaluation of antibiotic prescribing pattern in pediatrics in a tertiary care hospital
No full textBackground: The irrational use of antibiotics is a global issue and it can lead to morbidity, mortality, and increased health care costs. Hence, proper use of antibiotics is imperative and should be included in the pharmaceutical care plan. Objective: The objective of this study was to evaluate the prescribing pattern of antibiotics for children using WHO core prescribing indicators. Materials and Methods: A prospective, observational study was carried for 6 months in the pediatric department at a tertiary care hospital, Pune. The WHO prescribing indicators were used to evaluate the prescriptions, and the ideal WHO range was considered as a determining factor for rational prescription. Results: A total of 302 patients were included in the study, with a mean patient age of 4.92 ± 4 years. The average number of drugs per encounter was 6.12 (WHO standard is less than 2). The percentage of antibiotics prescribed was 26.3% with an average of 1.63 antibiotics per prescription. Of the 493 antibiotics, 85.59% were injectable which is higher than the WHO standard of 13.4–24.1%. A near-optimal value of 99.59% antibiotics was prescribed from the hospital formulary which is similar to WHO standards, and the antibiotics prescribed with generic names were 25.76%. The most common class of antibiotics prescribed were cephalosporins and penicillins. Conclusion: Polypharmacy, high injectable use, and non-adherence to generic prescription were common in our tertiary care center. Continuous audits, training, and new treatment protocols are recommended
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