•Tungsten (W) doped β-tellurene monolayers are studied for N rich gas sensing.•Doped tellurene show dopant's site dependent binding towards NO, N2O and NO2.•Dopants site specific adsorption energies ...make β-tellurene promising for gas sensing and storage applications.•IV characteristics, modulations in band gaps and thermodynamic analysis show modified tellurene as efficient gas sensor.
Nitrogen oxides play a significant role in various biomedical conditions, including respiratory disorders, asthma, and cardiovascular problems, underscoring the urgent need for sensitive and selective devices in biomedical applications. This study offers a comprehensive analysis of the sensitivity of β-tellurene doped with 2.22 % tungsten to nitrogen oxides (NO, NO2, and N2O). Site-specific doping of tellurene with tungsten reduces the band gap and introduces magnetization in β-tellurene. The strong adsorption energies observed for NO, NO2, and N2O at site A (-2.45 eV, -2.39 eV, and -2.80 eV, respectively) suggest that W-doped β-Te monolayers are promising candidates for gas storage for these compounds. Conversely, weaker adsorption energies for the same gases at site B (-0.74 eV, -1.74 eV, and -0.09 eV) highlights the importance of doping location. The adsorption energy values at site B indicate that W-doped β-Te monolayers have potential as sensing materials for NO and as adsorbents for NO2 gas. Conversely, the weak adsorption energy for N2O at the B site demonstrates its non-interacting behaviour with the W-doped β-Te monolayer. Additionally, the negligible change in electronic properties and minimal charge transfer suggest that this configuration is unsuitable for N2O storage and sensing. The spin-resolved current-voltage characteristics of doped tellurene reveal distinct behaviors influenced by gas molecule adsorption. Overall, these findings underscore the potential of W-doped tellurene as a site-specific material for the adsorption and sensing of targeted gases.
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► Research investigates biodiesel production from P. pinnata oils using DMC. ► Dimethyl carbonate and Pongamia pinnata oil was produced better biodiesel. ► This research is study on the reaction ...parameters influencing biodiesel production. ► Produced biodiesel passes major tests lead by ASTM standards.
The transesterification of Pongamia pinnata seed oil with dimethyl carbonate (DMC) for preparing DMC-BioD has been studied at the catalysis of potassium hydroxide (KOH). The effects of reaction conditions (ratio of P. pinnata seed oil and DMC, catalyst amount and reaction time, reaction temperature and agitation speed) on DMC-BioD yield were investigated. The highest DMC-BioD yield could reach 96% at refluxing temperature for 6h with ratio of P. pinnata oil to DMC 1:3w/w and 4% KOH (based on oil weight). Percentage of conversion has been analyzed by Gas Chromatography. P. pinnata seed oil DMC-BioD produced is characterized for the properties such as the kinematic viscosity at 40°C, density at 25°C, flash point (FP), pour point (PP), cloud point (CP), acid value and copper strip corrosion. P. pinnata seed oil DMC-BioD produced met with the quality standards defined under ASTM D675-02.
Background and objectives: Obstructive sleep apnea-hypopnea syndrome (OSAHS) and chronic obstructive pulmonary disease (COPD) are independently linked to an increase in cardiovascular disease (CVD). ...Only a few studies have been published linking the association between overlap syndrome and congestive heart failure (CHF). This review highlights the interplay between overlap syndrome (OSAHS-COPD) and CHF. Materials and methods: We thoroughly reviewed published literature from 2005 to 2022 in PubMed, Google Scholar, and Cochrane databases to explore the link between overlap syndrome and cardiovascular outcomes, specifically congestive heart failure. Results: Research indicates that individuals with overlap syndrome are more likely to develop congestive heart failure than those with COPD or OSA alone. Congestive heart failure is a common comorbidity of overlap syndrome, and it has a two-way connection with sleep-related breathing disorders, which tend to occur together more frequently than expected by chance. Conclusions: CHF seems to have a strong relationship with OS. Further research is required to understand the relationship between OS and CHF.
Rapid computational screening to aid novel catalyst design has evolved into an important and ubiquitous tool in modern heterogeneous catalysis. A possible shortcoming of this approach, however, is ...the material gap, that is, simplified computational models used for catalyst screening do not always capture the complexity of real catalytic systems. Here we investigate the importance of the material gap for complete methane oxidation over supported Pd/γ‐Al2O3 catalysts using a combination of DFT simulations and temperature‐programmed oxidation experiments. The Pd/γ‐Al2O3 active site was approximated by four models of increasing complexity, namely Pd(1 0 0), Pd(2 1 1), PdO(1 0 1), and Pd10/γ‐Al2O3(1 1 0), and each was also modified with metal promoters to discover reactivity trends. Although the unpromoted Pd model surfaces exhibit different methane activation activities, our DFT results indicate that an experimentally verified performance trend can be predicted for their promoted counterparts irrespective of the active‐site representation. We attribute the robustness of the trend predictions in this particular system to localized changes in the electron density during methane activation. Overall, our work supports the commonly practiced active‐site model simplifications during computational catalyst screening and provides fundamental insight into the qualitative agreement between theory and experiment for methane oxidation over promoted Pd catalysts.
Model and experiment shake hands: Consistent trends are found for methane activation over a series of modified Pd/γ‐Al2O3 catalyst computational models, which are in agreement with experimental activity measurements. This supports the common practice of using simplified catalyst representations for computational catalyst screening.
Introduction: Aging is a natural process that usually results in physiological, biological, emotional, and financial decline. As a result, a robust health system is required to meet their escalating ...health needs. Through this study, we got an opportunity to study the morbidity profile of the elderly and to assess their health-seeking behavior and its determinants in urban areas of Chandigarh. Material and Methods: The sample consisted of 360 participants. Multistage and proportionate sampling techniques were used to recruit study subjects. A structured interview was carried out to get information on the different parameters of health-seeking behavior of the elderly population. Results: The most pervasive determinant of health-seeking behavior was perceiving health issues related to age, no family support, and health-care expenditure. Conclusion: The elderly had a positive behavior toward seeking help with regard to health care. Multiple morbidities were evident among the elderly, and modern medication was the greatest choice. Improved perspective toward health, easy accessibility, and awareness regarding the disease may contribute to the willingness of seeking help for the health-care needs.
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•DNA nucleobases are physisorbed on the gallium selenide monolayer.•Predicted recovery time indicate reusability of GaSe based devices.•GaSe monolayer show anisotropic optical ...response in UV region.•GaSe monolayer is promising candidate for fabrication of reusable DNA sequencing devices.
The interaction of DNA nucleobases with monolayer GaSe has been studied with in DFT framework using vdW functional. We found that nucleobases are physisorbed on the GaSe monolayer. The order of binding energy per atom is C > T > G > A. The room temperature recovery time estimated to be maximum of 113.88 µs for T + GaSe indicting reusability of the GaSe based devices. The modulation in the electronic structures of GaSe has been clearly captured within the simulated STM measurements. We also demonstrate quantum capacitance as a key parameter for sensing applications. Furthermore, in optical properties, electron energy loss (EEL) spectra show red shift in photon energy on nucleobase adsorption in UV region. The red shift is maximum of 0.92 eV for E⊥c and 0.50 eV for E||c. In nutshell, GaSe monolayer exhibit anisotropic optical response in UV-region which can be highly beneficial for developing polarized optical sensors. Our results demonstrate that GaSe monolayer can be utilized to fabricate reusable DNA sequencing devices for biotechnology and medical science.
We report the continuous one-step synthesis of bimetallic copper–nickel nanostructured coatings by deposition and sintering of metal nanoparticles produced as an aerosol using a flame driven high ...temperature reducing jet (HTRJ) process. The HTRJ process allows gas-phase (aerosol) formation of metal nanoparticles from low-cost metal salt precursors. These can be collected as discrete powders for subsequent use in formulating conductive inks or for other applications. However, direct deposition of nanoparticles to form coatings allows measurements of electrical conductivity of films of deposited nanoparticles as a function of composition and sintering temperature, without actually formulating and printing inks. This is the approach taken here for the purpose of screening nanoparticle compositions quickly. We characterized the microstructure and composition of both nanopowders and films and found that their composition consistently matched the ratio of metals in the precursor solution. The electrical conductivity was highest (∼104 S/m) for films with 60:40 and 40:60 copper-to-nickel mass ratios. These films maintained their conductivity during extended storage (1 month) under ambient conditions. The oxidation resistance and high conductivity observed here suggest that 60:40 and 40:60 Cu:Ni nanoparticles have promise as lower cost replacements for silver nanoparticles in conductive ink formulations.
Structural stability, electronic, and transport properties of metal monochalcogenides MX (M = Ga, In; X = S, Se, Te) atomic nanowires have been systematically investigated. To address the effects of ...the environment on the stability of the nanowires in experimental settings the nanowires are exposed to environmental oxygen. Based on the first-principle calculations, we confirm the energetic, dynamic, and environmental stability of chalcogenides nanowires exhibiting semiconducting nature and bandgaps in the visible region. The electron carrier mobility for InSe, GaTe, and InS nanowires is predicted to be 32,778 cm2 V−1 s−1, 3541 cm2 V−1 s−1, and 1173 cm2 V−1 s−1, respectively, which is higher than the corresponding 2D monolayer and MoS2. The modulations in geometrical parameters are captured using simulated STM analysis. Negative differential conductance predicted for GaTe and InSe nanowires can be used as a marker to characterize them using Current-Voltage profiling. The surface storage charge value of nanowires shows bias dependence indicating the flexible use of nanowires for cathode and anode material application in supercapacitors. Moreover, the outstanding values of mobilities in these nanowires may serve as an excellent electron transport channel in nanowires-based transistors. Therefore, our present study provides significant pointers for applying MX nanowires in fast-switching electronic devices and supercapacitors.
Hepatic artery pseudoaneurysm (HAP) is a rare complication of liver trauma and liver transplant, and spontaneous subcapsular liver hematoma is not frequently encountered outside the setting of ...preeclampsia and hemolysis, elevated liver enzyme and low platelet (HELLP) syndrome. We report a rare case of spontaneous subcapsular liver hematoma with hepatic artery pseudoaneurysm without any apparent liver trauma or recent interventional procedures of the hepatobiliary system. Although subcapsular hepatic hematoma and HAP are uncommon diagnoses, clinicians should be aware of these diagnoses to promptly diagnose and effectively treat them. Clinicians should also not forget these diseases could be masked by other common etiologies, such as gastritis.
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