The basic motivation of this investigation is to develop an innovative mathematical model for electro-osmotic flow of Couette–Poiseuille nanofluids. The power-law model is treated as the base fluid ...suspended with nano-sized particles of aluminum oxide (Al2O3). The uniform speed of the upper wall in the axial path generates flow, whereas the lower wall is kept fixed. An analytic solution for nonlinear flow dynamics is obtained. The ramifications of entropy generation, magnetic field, and a constant pressure gradient are appraised. Moreover, the physical features of most noteworthy substantial factors such as the electro-osmotic parameter, magnetic parameter, power law fluid parameter, skin friction, Nusselt number, Brinkman number, volume fraction, and concentration are adequately delineated through various graphs and tables. The convergence analysis of the obtained solutions has been discussed explicitly. Recurrence formulae in each case are also presented.
We report an additive manufacturing process using in-house custom-made inks for the fabrication of ohmic contact RF MEMS switches. The fabrication involves multiple steps of additive printing using a ...conductive silver ink and a PMMA poly(methyl methacrylate) photoresistive polymer ink. The inks comply with the rheology requirements of the M3D material deposition system. Deposition is made at 40°C and feature sizes involve 10-20μm. The maximum temperature of the process depends on ink curing and was 250°C. A functional ohmic contact cantilever RF MEMS switch on flexible Kapton™ substrate was fabricated and tested successfully, and results are presented.
A variety of functionalized imidazo1,2-apyridines have been synthesized through a one-pot, room temperature, and reagent-free reaction between MBH acetates of nitroalkenes and 2-aminopyridines. The ...reaction involves a cascade inter-intramolecular double aza-Michael addition of 2-aminopyridines to MBH acetates. Our methodology is marked by excellent yield, regioselectivity and, above all, adaptability to synthesize imidazopyridine-based drug molecules such as Alpidem and Zolpidem.
A cascade process involving an SN2′ reaction and an intramolecular oxa-Michael addition has been developed by treating Morita–Baylis–Hillman acetates of nitroalkenes with arenols, such as ...β-naphthols, α-naphthols, and substituted phenols under basic conditions. The products, arenofurans, are formed as single regioisomers in good to excellent yield in most cases. The methodology has been successfully employed for the total synthesis of an anti fungal agent isoparvifuran.
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Cascade reactions of 1,3-dicarbonyls with Morita-Baylis-Hillman acetates of nitroalkenes using a quinine derived chiral squaramide organocatalyst led to the formation of pyranones and ...pyranonaphthoquinones in good to excellent yields and high diastereo- and enantioselectivities. Representative examples of the reaction scale-up with a much lower catalyst loading without an appreciable loss of selectivities and synthetic transformations of the products are also reported here. The compounds described herein for the first time were evaluated against the infective bloodstream form of Trypanosoma cruzi, the etiological agent of Chagas disease, since the structures are related to bioactive α-lapachones.
Several regioselective functionalized mono- and disubstituted 7oxa-helicenoids have been synthesized in the enantiomerically enriched (90–99% ee) form. These functionalized helicenoids exhibited ...pronounced spectral and chiroptical properties suitable for sensing applications. In particular, corresponding helicenoid’s mono and dialdehydes have been effectively used as chemodosimeters for selective detection of cyanide anions over other anions, while simple aromatic aldehydes do not function as cyanide sensors. The groove available in the helical host plays a crucial role in the sensing. The enantiomerically enriched nature of the sensors allows the use of electronic circular dichroism as an uncommon detection tool for cyanide anions, along with conventional fluorescence and NMR methods.
In light of the SDG goals, carbon emissions from different food and food-related products have been under serious scrutiny in recent years. Despite the increasing awareness of global warming and the ...carbon footprint issue, food culture in different societies is difficult to change. Food production and storage are related to food security. The assessment of food-related carbon footprint should be linked with the chain of food lines rather than food items per se. It is obvious that much of the carbon emission is contributed by the production of it, packaging, storage, transportation, modification, quality control, and other related logistics. Therefore, this research investigated the correlation between food consumption and carbon footprint in the two types of diets and different populated regions. A systematic literature review combined with a bibliometric analysis approach was taken to construct the discussion. It studied the sources of carbon footprint and the life cycle of daily diet consumption and compared the carbon footprint of animal and plant-based diets. An evaluation of carbon footprint from various dietary patterns in India, China, and Italy was qualitatively carried out based on the published data in different scientific databases, and quantified values were discussed. Animal-based protein diets, especially meat, were found to have a higher contribution of carbon footprint; rice, however, contributes the highest among the plant-based diets. The bibliometric analysis pointed to the academic engagement on food-related carbon footprint issues across the globe and the scope of improvement. This review will help researchers to construct a thematic framework, and policymakers reorient the policy implementation.
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•Sources and impacts of food-related Carbon Footprints towards the environment.•Comparison of Carbon Footprints in regular diets in three different regions.•Suggestions to improve the scenario for each stage in the food production and consumption chain.•Bibliometric analysis through a systematic review process to map the intellectual structure of a research area.
A one-pot, two-step, three-component method for the conversion of commercially available aldehydes to phosphonylpyrazoles has been developed, demonstrating, for the first time, the dual reactivity of ...the Bestmann–Ohira reagent (BOR) in a single-pot transformation. This method, extended to the synthesis of sulfonylpyrazoles by employing BOR in the first step and a diazomethyl sulfone in the second step, is complementary, with regard to regioselectivity, to the previous methods for the synthesis of such functionalized pyrazoles.
1,3-Dipolar cycloaddition of the anion of diethyl 1-diazomethylphosphonate, generated in situ from diethyl 1-diazo-2-oxopropylphosphonate (Bestmann−Ohira reagent), with conjugated nitroalkenes ...provides regioisomerically pure phosphonylpyrazoles in moderate to good yield. These pyrazoles are formed in one pot via spontaneous elimination of the nitro group. However, nitropyrazoles could be synthesized by the same strategy using α-bromonitroalkenes. The methodology works for the synthesis of phosphonylpyrazoles fused to other carbo- and heterocycles as well.
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