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251.
Tapan K. Gupta 《Journal of Materials Science》1971,6(1):25-32
The densification rate and grain growth rate of pure MgO powder compacts are measured between 1450 and 1650° C in air. Densification rate in a semilog plot appears to be linear up to about 94% of the theoretical, followed by marked nonlinearity. The time dependence of grain growth is 1/2 at the beginning and then decreases considerably with further sintering. Application of lattice diffusion model to the densification and grain growth data gives calculated diffusion coefficients in fair agreement with the directly measured diffusion coefficients for magnesium; they are also in fair agreement with the literature value of the diffusion coefficients calculated from various other kinetic processes in MgO. 相似文献
252.
253.
Sau TK Rogach AL Döblinger M Feldmann J 《Small (Weinheim an der Bergstrasse, Germany)》2011,7(15):2188-2194
Multispiked gold nanoparticles are required in large quantities for many fundamental studies and applications like (bio)sensing, but their preparation in high yield by the bottom-up chemical synthetic method is challenging. A water-based, non-'seed-mediated', straightforward method for the synthesis of gold nanoparticles with well-developed surface spikes is reported here. The yield of multispiked gold particles is very high (>90%). The method allows the tuning of the number and size of the spikes and the overall size of the particles, and hence the localized surface plasmon resonances of the particles over the broad spectral range in the visible and near-infrared. A mechanism for the evolution of twinned, sharp-tipped surface protrusions has been proposed based on systematic spectrophotometric and transmission electron microscopic studies, which were employed to elucidate the morphological features, structure, chemical composition, and optical properties of the multispiked gold nanoparticles. 相似文献
254.
An investigation has been carried out to evaluate the two-phase pressure drop for gas-non-Newtonian liquid flow across orifices. The method of dimensional analysis was used to correlate the experimental data. The correlation developed predicts the two-phase frictional pressure drop across the orifices with acceptable statistical accuracy. 相似文献
255.
3-Deoxy-D -manno-Oct-2-ulosonic acid (Kdo)-containing oligosaccharides are a conserved carbohydrate component in lipopolysaccharides (LPSs) of the outer membrane of Gram-negative bacteria, and they are also present in capsular polysaccharides (CPSs) of bacteria and plant cells. The association of the bacterial LPS with the pathophysiology of bacterial infection have long been recognized. Structure pathophysiology studies of bacterial infection need to use pure and homogeneous LPS fragments. Such a requirement can be fulfilled by the synthesis of Kdo glycosides and related Kdo oligosaccharide conjugates. This article provides an overview of the glycosylation chemistries of the synthesis of Kdo α-/β-glycosides, oligosaccharides with Kdo units such as LPS core oligosaccharides, and lipid A derivatives. 相似文献
256.
Mostafizur Rahaman Tapan Kumar Chaki Dipak Khastgir 《Polymer Engineering and Science》2014,54(7):1632-1639
The compressive stress (pressure) sensitivity of dielectric properties has been studied on ethylene vinyl acetate (EVA)/polyaniline (Pani) composites prepared through In‐situ synthesis of polyaniline in the solution of insulating EVA matrix. It is observed that the dielectric constant and loss increase with the increase in applied pressure, that is some piezoelectric effect is observed for these composites. The dielectric properties are also found to increase with respect to time when subjected under constant pressure. It is seen that changes in dielectric constant and loss follow some exponential relationships with respect to applied pressure and time duration under constant stress, and the relaxation time for the composites can be calculated. The relaxation time decreases with the increase in concentration of Pani in a composite. However, a composite with lower Pani content exhibits relatively higher change in dielectric properties against applied pressure and time duration under compression compared to one with higher loading. Granular crew type morphology of Pani is observed through scanning electron microscopic (SEM) study. This study reveals that these EVA‐Pani composites can be used as dielectric sensor. POLYM. ENG. SCI., 54:1632–1639, 2014. © 2013 Society of Plastics Engineers 相似文献
257.
Karnik Tapan Shivakumara Palaiahnakote Chowdhury Pinaki Nath Pal Umapada Lu Tong Anuar Nor Badrul 《Multimedia Tools and Applications》2022,81(2):1765-1785
Multimedia Tools and Applications - Human trafficking is a global issue of the world and the problems related to human trafficking remain unsolved. This paper presents a new method for the... 相似文献
258.
Recently, we found that poly(gamma-glutamic acid)oxovanadium(IV) complex (VO(gamma-pga)) exhibits a potent antidiabetic activity in streptozotocin (STZ)-induced type 1 diabetic mice. This result prompted us to examine its ability to treat the type 2 diabetic model KKA(y) mice with insulin resistance. We studied the in vivo antidiabetic activity of VO(gamma-pga), compared with that of vanadium(IV) oxide sulfate (VS) as control. Both compounds were orally administered at doses of 5-10 mg (0.1-0.2 mmol) V kg(-1) body mass to the KKA(y) mice for 30 days. VO(gamma-pga) normalized the hyperglycemia within 21 days, whereas VS lowered the blood glucose concentration only by a small degree. In addition, the glucose intolerance, HbA(1c) level, hyperinsulinemia, hypercholesterolemia, and hyperleptinemia were significantly improved in VO(gamma-pga)-treated KKA(y) mice compared with those treated with VS. Based on these observations, VO(gamma-pga) is proposed to be the first orally active oxovanadium(IV)-polymer complex for the efficacious treatment of not only type 2 diabetes but also metabolic syndrome in animals. 相似文献
259.
Emerging solar cell (ESC) carrier's dynamic transfer difficulties and instability at dissimilar material's interface seems to be potential distress. Electrical permittivity influences on photo carrier dynamics of nonpolarized organic and polarized organic‐inorganic perovskite solar cell. ESC electrical efficiency and stability are consider to be managed broadly by carrier accumulation, extraction, and conduction techniques. Active materials optoelectric interaction and carrier accumulation are petite known. Its energetic dealings with dissimilar interface materials how support to faster carrier extraction and conduction are still in haze. In this drill, focus on active to interface materials key properties are imperative to find a way to promote electrical energy conversion and its steadiness. Selected advanced interface engineering materials (IEMs) architectures, conduction, and multifarious relations to active materials for efficient energy transfer ability and stability are reported precisely by the model. The interface structure consistency supports to systematize energy transfer, otherwise, disorder or energy loss is anticipated. Therefore, active material linkage to IEM photophysical, quantum, and choice of materials technologies are focused comprehensively to explore the pathway of ESC stability and efficiency progression. 相似文献
260.
Barış Erdil Fırat Kıpçak Mücip Tapan 《The Structural Design of Tall and Special Buildings》2024,33(5):e2089
As a result of the combination of the complex behavior of masonry buildings with insufficient material quality and lack in engineering calculations, a large number of damages has been observed in the earthquakes that occurred in recent years. Therefore, a realistic understanding of the behavior of masonry walls and buildings is necessary to construct seismic-resistant structures. Since masonry walls have many variables, performing experiments in which each variable is present at the same time will make it difficult to understand the behavior. For these reasons, considering the out-of-plane failures that are frequently mentioned in recent earthquakes, in this study, variables in dry-stack brick masonry buildings such as the aspect ratio of the wall (2, 1.33, and 1), the presence of the transverse walls (2, 1, and 0), and the openings in the walls (door and/or window) were taken into account separately. Eighteen different wall configurations were designed, and a total of 48 dry-stack walls having U-shape, L-shape, and I-shape in plan were tested by a specially constructed tilting table setup to determine their out-of-plane behavior. From the test results, it was found that lateral load capacity of the U-shaped walls without openings increased as the aspect ratio (L/H) decreased. No change in capacity was observed in L- and I-shaped walls when the aspect ratio was reduced from 2 to 1. Door and/or window openings were found to affect only the L-shaped walls. In addition, it was determined that failure patterns were affected from the aspect ratio and the presence of the openings. 相似文献