ARM Based Security & Safety System for Base Transceiver Station

The main aim of this system is for Maintenance, Safety & Security of Base Transceiver Station (BTS) site and the tower . The major problems faced include the theft of Wires & Diesel , the fluctuation of Temperatures, unauthorized person entry, unnoticedfuel amount ,Current taken by load and the technician’s time management. The instant message about the each activity happening in the site given byGSM modem. The temperature sensors will sense the temperature of the room and if it rises above the threshold value the GSM module will send the message to the mobile. Thetemperature values are displayed on LCD, the controller gives command to cooling Fan to ON & Real time Images recording on PC by using MATLAB software with GUI .The cell site Base Transceiver Station (BTS) which are operated by Diesel generator .When the fuel level goes below the set value a message is sent to the technician requesting for refilling & with Real time Images recording with on PC by using MATLAB software. Door open/close sensor is used for indication of door opening and closing. Wire Theft Status indicated by IR Sensor .The site door can be accessed only through the RFID system. The situation in the site is updated to the technician through messages. PIR sensor used to detects the presence of humans inside the room. The system includes a Current sensor to measure Load Current & Humidity Sensor to sense humidity of BTS room with Real time Images recording on PC. Camera record BTS room. The value of Temperature & Humidity of BTS room, Diesel Level of Generator& Load Current are Logged in PC with respective time & date. Our project improves the performance ability of BTS. This technique is remote controlling and monitoring can be implemented at each and every BTS tower to look after the safety and management of its network

Trends of caesarean section: an analytical overview of indications

Background: Caesarean section is one of the commonly performed surgical procedures in obstetrics. An increasing trend has been observed in both primary and repeat caesarean sections. The reasons for its increase are multifaceted. So, this study was carried out to compare the rates of caesarean delivery and to analyse various indications contributing to it.Methods: This retrospective study was conducted over a period of three year from 1st January 2016 to 31st December 2018 at the department of obstetrics and gynaecology, tertiary care hospital Pune, Maharashtra, India. All caesarean delivery (primary and repeat) taken place during the study period. The rate and indications of caesarean section was calculated over the study period to find out the trends in caesarean delivery. The data so collected was presented with graphical representation. Statistical analysis was performed with SPSS software and t-test was used for continuous data and pearson chi square test for discrete data.Results: There were a total of 12373 deliveries during the study period out of which, 3701 had delivered via Caesarean Section. So, the rate of caesarean section in the study was found to be 29.91%.Conclusions: Being a tertiary care hospital, a high rate of caesarean deliveries was observed, Individualization of the indication and careful evaluation, following standardized guidelines, practice of evidenced-based obstetrics and audits in the institution, can help us limit caesarean section rates

Influence of silica nano-additives on performance and emission characteristics of soybean biodiesel fuelled diesel engine

The present study examines the effect of silicon dioxide (SiO2) nano-additives on the performance and emission characteristics of a diesel engine fuelled with soybean biodiesel. Soybean biofuel was prepared using the transesterification process. The morphology of nano-additives was studied using scanning electron microscopy (SEM), X-ray diffraction (XRD) and energy-dispersive X-ray spectroscopy (EDS). The Ultrasonication process was used for the homogeneous blending of nano-additives with biodiesel, while surfactant was used for the stabilisation of nano-additives. The physicochemical properties of pure and blended fuel samples were measured as per ASTM standards. The performance and emissions characteristics of different fuel samples were measured at different loading conditions. It was found that the brake thermal efficiency (BTE) and brake specific fuel consumption (BSFC) increased by 3.48-6.39% and 5.81-9.88%, respectively, with the addition of SiO2 nano-additives. The carbon monoxide (CO), hydrocarbon (HC) and smoke emissions for nano-additive added blends were decreased by 1.9-17.5%, 20.56-27.5% and 10.16-23.54% compared to SBME25 fuel blends. *Please note that there are multiple authors for this article therefore only the name of the first 5 including Federation University Australia affiliate “M. Shahabuddin” is provided in this record*

DEVELOPMENT OF OLMESARTAN MEDOXOMIL-LOADED CHITOSAN MICROPARTICLES: A POTENTIAL STRATEGY TO IMPROVE PHYSICOCHEMICAL AND MICROMERITIC PROPERTIES

Objective: The objective of the present research was to improve physicochemical and micromeritic properties of Olmesartan Medoxomil (OLM), BCS class II antihypertensive drug by loading in Chitosan (CH) microparticles.Methods: The 32 full factorial design was assigned for microparticles prepared by single emulsion technique method using CH, a natural polymer and Glutaraldehyde (GA) as cross linking agent. Developed microparticles were characterized for Micromeritic properties, morphology by Scanning Electron Microscopy (SEM), drug entrapment efficiency, in vitro drug release, and interaction studies Fourier transfer infrared spectroscopy (FTIR) & Differential Scanning Calorimetry (DSC), drug crystallinity study by X-ray diffractometry (XRD) & DSC.Results: Maximum entrapment efficiency was found 61.76% for maximal CH and lower GA concentration. Saturation solubility of microparticles was increased by 13.74 times to that of pure OLM. FTIR showed compatibility between drug and polymer. XRD, DSC and SEM studies confirmed reduction in crystallinity of drug. It led to increase in dissolution profile of the drug and showed 92.61% of drug release in 120 min. These microparticle preparations also helped in improving micromeritic properties like bulk density, tapped density, the angle of repose, Hausner's ratio and Carr's index.Conclusion: The results obtained in the present work demonstrate the potential use of CH to modulate physicochemical and micromeritic properties of OLM especially obtaining significant improvement in dissolution rate. Â

Thermal Stability and Sublimation of Two-Dimensional Co9Se8 Nanosheets for Ultrathin and Flexible Nanoelectronic Devices

An understanding of the structural and compositional stability of nanomaterials is significant from both fundamental and technological points of view. Here, we investigate the thermal stability of half-unit-cell thick two-dimensional (2D) Co9Se8 nanosheets that are exceptionally interesting because of their half-metallic ferromagnetic properties. By employing in situ heating in the transmission electron microscope (TEM), we find that the nanosheets show good structural and chemical stability without changes to the cubic crystal structure until sublimation of the nanosheets starts at temperatures between 460 and 520 °C. The real-time observations of the sublimation process show preferential removal at {110} type crystal facets. From an analysis of sublimation rates at various temperatures, we find that the sublimation occurs through noncontinuous and punctuated mass loss at lower temperatures while the sublimation is continuous and uniform at higher temperatures. Our findings provide an understanding of the nanoscale structural and compositional stability of 2D Co9Se8 nanosheets, which is of importance for their reliable application and sustained performance as ultrathin and flexible nanoelectronic devices

Thermolysis-Driven Growth of Vanadium Oxide Nanostructures Revealed by In Situ Transmission Electron Microscopy: Implications for Battery Applications

Understanding the growth modes of 2D transition-metal oxides through direct observation is of vital importance to tailor these materials to desired structures. Here, we demonstrate thermolysis-driven growth of 2D V2O5 nanostructures via in situ transmission electron microscopy (TEM). Various growth stages in the formation of 2D V2O5 nanostructures through thermal decomposition of a single solid-state NH4VO3 precursor are unveiled during the in situ TEM heating. Growth of orthorhombic V2O5 2D nanosheets and 1D nanobelts is observed in real time. The associated temperature ranges in thermolysis-driven growth of V2O5 nanostructures are optimized through in situ and ex situ heating. Also, the phase transformation of V2O5 to VO2 was revealed in real time by in situ TEM heating. The in situ thermolysis results were reproduced using ex situ heating, which offers opportunities for upscaling the growth of vanadium oxide-based materials. Our findings offer effective, general, and simple pathways to produce versatile 2D V2O5 nanostructures for a range of battery applications

Expression of stem cell biomarker aldehyde dehydrogenase 1 (ALDH1) in canine mammary tumor

The study was conducted to investigate the immunohistochemical expression of a stem cell biomarker, ALDH1 in CMTs. ALDH1 is a cytosolic enzyme responsible for oxidizing intracellular aldehydes leading to the oxidation of retinol to retinoic acid, a key step involved in early stem cell differentiation. It was noticed that the cells expressing this marker possess ability to self renew. In present investigation, we assessed the expression of ALDH1 by immunohistochemistry on paraffin embedded tissue sections from 31 confirmed clinical cases of canine mammary tumors (CMT). The results of immunohistochemistry were analyzed semiquantitatively by calculating percentage score and staining intensity using light microscope and comparing it with the histological types. ALDH1 expression was detected in 26 (83%) of CMTs and it was observed in benign lesions, invasive cells and cells undergoing epithelial to mesenchymal transition (EMT). The high expression patterns of ALDH1 in various histological types of CMT indicated poor prognosis

Structural Dynamics and Tunability for Colloidal Tin Halide Perovskite Nanostructures

Lead halide perovskite nanocrystals are highly attractive for next-generation optoelectronics because they are easy to synthesize and offer great compositional and morphological tunability. However, the replacement of lead by tin for sustainability reasons is hampered by the unstable nature of Sn2+ oxidation state and by an insufficient understanding of the chemical processes involved in the synthesis. Here we demonstrate an optimized synthetic route to obtain stable, tunable, and monodisperse CsSnI3 nanocrystals, exhibiting well defined excitonic peaks. Similar to lead halide perovskites, we prepare these nanocrystals by combining a precursor mixture of SnI2 , oleylamine and oleic acid, with a Cs-oleate precursor. Among the products, nanocrystals with 10 nm lateral size in the γ-orthorhombic phase prove to be the most stable. To achieve such stability, an excess of precursor SnI2 as well as sub-stoichiometric Sn:ligand ratios are key. Structural, compositional and optical investigations complemented by first-principle DFT calculations confirm that nanocrystal nucleation and growth follow the formation of (R-NH3 + )2 SnI4 nanosheets with R = C18 H35 . Under specific synthetic conditions, stable mixtures of 3D nanocrystals CsSnI3 and 2D nanosheets (Ruddlesden-Popper (R-NH3 + )2 Csn-1 Snn I3n+1 with n>1) are obtained. These results set a path to exploiting the high potential of Sn halide perovskite nanocrystals for opto-electronic applications. This article is protected by copyright. All rights reserved

Selective Vertical and Horizontal Growth of 2D WS2 Revealed by In Situ Thermolysis using Transmission Electron Microscopy

Direct observation of the growth dynamics of 2D transition metal dichalcogenides (TMDs) is of key importance for understanding and controlling the growth modes and for tailoring these intriguing materials to desired orientations and layer thicknesses. Here, various stages and multiple growth modes in the formation of WS2 layers on different substrates through thermolysis of a single solid-state (NH4)2WS4 precursor are revealed using in situ transmission electron microscopy. Control over vertical and horizontal growth is achieved by varying the thickness of the drop-casted precursor from which WS2 is grown during heating. First depositing platinum (Pt) and gold (Au) on the heating chips much enhance the growth process of WS2 resulting in an increased length of vertical layers and in a self-limited thickness of horizontal layers. Interference patterns are formed by the mutual rotation of two WS2 layers by various angles on metal deposited heating chips. This shows detailed insights into the growth dynamics of 2D WS2 as a function of temperature, thereby establishing control over orientation and size. These findings also unveil the important role of metal substrates in the evolution of WS2 structures, offering general and effective pathways for nano-engineering of 2D TMDs for a variety of applications