277 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
FDI Spillovers, Innovation and the Role of Industrial Clusters: Evidence from Innovative Indian Manufacturing Firms
No full text© 2025, Elsevier B.V. The attached document (embargoed until 08/09/2026) is an author produced version of a paper published in Economic Modelling uploaded in accordance with the publisher’s self-archiving policy. The final published version (version of record) is available online at the link. Some minor differences between this version and the final published version may remain. We suggest you refer to the final published version should you wish to cite from it
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.
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
Closed Form HJB Solution for Path Planning of a Robot Manipulator with Warehousing Applications
No full textReal-time optimal path planning for robotic manipulations in task space is a very fundamental and important problem. In this paper, the problem of generating robot trajectories in an obstacle-ridden environment is formulated under an optimal control framework using Hamilton-Jacobi-Bellman (HJB) equation. The novel contribution of this paper is that a closed form HJB control solution (a necessary and sufficient condition for global optimality of a control solution with respect to a cost function) has been achieved for generating real-time optimal trajectories for a robot manipulator. In contrast with the decoupled end-effector path planning and subsequent trajectory generation, the proposed scheme can exploit sensory input for real-time trajectory generation where the end-effector path as well as the joint trajectory is recomputed online while satisfying the real-time constraints. The stability and the performance of the proposed control framework is shown theoretically via Lyapunov approach and also verified experimentally using a 6 degrees of freedom (DOF) Universal Robot (UR) 10 robot manipulator. It is shown that a significant saving in cost metrics can be obtained over similar trajectory generation approaches from the state-of-the-art with obstacle-ridden environment and also has better performance in high speed tracking applications. Warehouse applications of the proposed scheme in case of static and dynamic targets with respect to the robot manipulator is also included.Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Learning & Autonomous Contro
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)
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