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排序方式: 共有87条查询结果,搜索用时 31 毫秒
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53.
Nagaraja SreeHarsha Jagadeesh G. Hiremath Rajesh Kumar Aitha Abraham J. Domb Bandar E. Al‐Dhubiab Chandramouli Ramnarayanan Abdullah Mossa Alzahrani Katharigatta N. Venugopala Sabah H. Akrawi Mahesh Attimarad Anroop B. Nair 《先进技术聚合物》2019,30(10):2613-2622
This research presents a thin‐film hydration‐solvent evaporation method to formulate the paclitaxel loaded poly (DL lactic acid co castor oil) 4:6 with poloxamer‐F68 cylindrical shape nanoparticles. The particles were less than 250 nanometers (nm) in size, with an average width of 60 nm and an average length of 100 nm. The percent yield, encapsulation efficiency (EE), and percent drug loading (DL) were detected. This approach produces drug loading values between 5% and 20% w/w. X‐ray powder diffraction (XRD) identified the physicochemical properties of nanoparticles differential scanning calorimetry (DSC) and Fourier‐transform infrared spectroscopy (FTIR). The investigation shows that the drug is molecularly dispersed in polymers or given in an amorphous or semicrystalline state. Horizontal water bath shaker technology considered the in vitro release of PTX loaded nanoparticles under sink conditions. Poly (DL lactic acid co castor oil) 4:6 nanoparticles exhibited a sustained release analysis. At the end of 30 hours, the percent cumulative drug release from the formulations was between 74.52% and 92.87% for F1 and F4. In vitro cytotoxicity assays indicate that PTX having p (DLLA:CO60:40) nanoparticles have a higher cytotoxic effect on MCF‐7/ADR. 相似文献
54.
N. M. Bujurke S. N. Biradar P. S. Hiremath 《Zeitschrift für Angewandte Mathematik und Physik (ZAMP)》1987,38(4):653-657
Summary The heat transfer in the flow of a second-order fluid, obeying Coleman and Noll's constitutive equation based on the postulate of gradually fading memory, over a stretching sheet has been studied. The boundary layer characteristics of this flow have been obtained. The velocity boundary layer thickness decreases for increasing values of the parameterKC/v. The thermal boundary layer thickness decreases and the Nusselt numberNu
x increases for increasing Prandtl numberP
r orC. 相似文献
55.
S. B. Mathur S. V. Hiremath G. H. Kulkarni G. R. Kelkar S. C. Bhatacharyya
D. Simonovic
A. S. Rao 《Tetrahedron》1965,21(12):3575-3590The structure III assigned to dehydrocostus lactone by Sorm et al. has been supported by converting it into (i) guaiane, C15H28 (I) and (ii) s-guaiazulene and chamazulene in fairly high yield from sone of its derivatives. The lactol XII, obtainable from III gives four different products (XIII, XIV, XVIII and XXIV) when subjected to Huang-Minlon reduction at 135° and 170° respectively. The dienic monol (XVIII) the structure of which is supported by UV and NMR spectra, furnished a hydrocarbon C15H26 XXVIII, when subjected to metal amine reduction indicating the presence of an allylic hydroxyl in it, which proves that the lactone attachment in III is at C6–C7. 相似文献
56.
Hiremath CS Yenagi J Tonannavar J 《Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy》2007,68(3):710-717
Fourier-transform laser Raman (3500-50 cm(-1)) and infrared (4000-400 cm(-1)) spectral measurements have been made for the solid 3-chloro-4-methoxybenzaldehyde. The electronic structure calculations -ab initio (RHF) and hybrid density functional methods (B3LYP and B3PW91) -- have been performed with 6-31G* and 6-311G* basis sets. Molecular electronic energies, equilibrium geometries, IR and Raman spectra have been computed. Potential energy distribution (PEDs) and normal mode analysis have also been performed. A complete assignment of the observed spectra has been proposed. Investigation of the relative orientation of the aldehydic oxygen and chlorine atom with respect to the methoxy group has shown that two forms, O-cis and O-trans exist, with O-trans form being more stable. The energy difference between O-cis and O-trans forms is 0.057 kcal/mol (21 cm(-1)) with B3LYP/6-31G*, which is less than the calculated torsional vibrational frequencies of the aldehyde and methoxy group. In the CH (O) aldehydic stretching region five observed bands are probably due to multiplet Fermi resonance. An infrared doublet near 1700 cm(-1) with nearly equal intensities has been ascribed to the Fermi resonance: the two bands at 1696 and 1679 cm(-1) arise due to the interaction between the CO stretching fundamental and a combination of O-CH(3) and CC stretching vibrations. 相似文献
57.
Dr. B. N. Veerabhadraswamy Sachin A. Bhat Dr. Uma S. Hiremath Dr. Channabasaveshwar V. Yelamaggad 《Chemphyschem》2019,20(21):2836-2851
In this report, based on the results derived from the extensive study into the thermal and photophysical properties, an anomalous mesomorphic behavior of photoluminescent, chiral nematic (N*) liquid crystalline dimers, belonging to two different series has been revealed. They comprise cholesterol and fluorescent three-ring Schiff base or salicylaldimine core interlinked via an ω-oxyalkanoyloxy spacer of varying length and parity. The effect of molecular structure on the liquid crystal (LC) behavior and photophysical properties of both the series has been probed by varying the length of the terminal n-alkoxy tails for a fixed (odd or even) parity of the spacer. The detailed investigations using complementary techniques not only evidenced the existence of the N* phase in all the dimers synthesized but also the occurrence of an intriguing odd-even effect; blue phases (BPs) exist in all the dimers comprising even-membered spacer, which surprisingly remains totally absent in their odd-membered counterparts. While the results reported hitherto are exactly opposite to the aforesaid findings, this atypical behavior has been interpreted in terms of the over-all shape of the dimers rendered by the orientation of terminal tails. Photophysical studies carried out clearly revealed the intrinsic light emitting feature of the dimers not only in their dilute solutions but also in their three condensed states viz., solid, N* phase, and isotropic liquid state; the emission intensities of the N* phase varies with the change in temperature, as expected. CD spectra of the N* phase recorded as a function of temperature show bisignate CD band characteristically, signifying large chiral correlations in the molecular self-assembly, while the origin of bands from positive to negative region suggests a right-handed twist of the N* helix. 相似文献
58.
Varun Hiremath Steven R. Lantz Haifeng Wang Stephen B. Pope 《Proceedings of the Combustion Institute》2013,34(1):205-215
Simulations of turbulent reacting flows with chemistry represented using detailed kinetic model involving a large number of species and reactions are computationally expensive. Here we present a combined dimension reduction and tabulation strategy for implementing chemistry in large scale parallel Large-Eddy Simulation (LES)/Probability Density Function (PDF) computations of turbulent reacting flows. In this approach, the dimension reduction is performed using the Rate Controlled Constrained-Equilibrium (RCCE) method, and tabulation of the reduced space is performed using the In Situ Adaptive Tabulation (ISAT) algorithm. In addition, we use x2f_mpi — a Fortran library for parallel vector-valued function evaluation (used with ISAT in this context) — to efficiently redistribute the chemistry workload among the participating cores in parallel LES/PDF computations to reduce the overall wall clock time of the simulation. We test three parallel strategies for redistributing the chemistry workload, namely (a) PLP, purely local processing; (b) URAN, the uniform random distribution of chemistry computations among all cores following an early stage of PLP; and (c) P-URAN, a Partitioned URAN strategy that redistributes the workload within partitions or subsets of the cores. To demonstrate the efficiency of this combined approach, we perform parallel LES/PDF computations (on 1024 cores) of the Sandia Flame D with chemistry represented using a 38-species C1–C4 skeletal mechanism. We show that relative to using ISAT alone with the 38-species full representation, the combined ISAT/RCCE approach with 10 represented species (i) predicts time-averaged mean and standard deviation statistics with a normalized root-mean-square difference of less than 3% (30 K) in temperature, less than 2% (0.02 kg/m3) in density, less than 2.5% in mass fraction of major species, and less than 8% in mass fraction of minor species of interest; and (ii) reduces the simulation wall clock time by over 40% with the P-URAN strategy. 相似文献
59.
KATJA KRüGER 《Pramana》2012,79(4):563-578
Recent QCD results from electron?Cproton interactions at HERA and JLAB are presented. Inclusive cross-section measurements as well as studies of the hadronic final state like jet production or the production of heavy quarks are discussed. The results are compared with perturbative QCD predictions and their impact on the determination of the parton density functions of the proton as well as of the strong coupling ?? s is discussed. 相似文献
60.
K. L. Sandhya Shankar D. S. Rao Krishna S. Prasad Uma S. Hiremath C. V. Yelamaggad 《Liquid crystals》2003,30(11):1351-1355
We report high pressure investigations on a homologous series of liquid crystalline dimeric molecules in which the terminal chain length is kept constant but the length of the methylene spacer connecting the two mesogenic units is varied. We find that unlike the nematic-isotropic transition temperature and associated entropy change, there is no alternation in the slope of the nematic-isotropic phase boundary in the pressure-temperature plane as a function of the length of the spacer group in the molecule. By applying the Clausius-Clapeyron equation we conclude that the volume change at the transition should exhibit a strong odd-even effect. Measurements on the shortest homologue of the series, which is non-mesomorphic, show the expected result that the application of pressure induces mesomorphism in non-mesomorphic compounds. 相似文献