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1.
Maleki Akbar Elahi Milad Assad Mamdouh El Haj Alhuyi Nazari Mohammad Safdari Shadloo Mostafa Nabipour Narjes 《Journal of Thermal Analysis and Calorimetry》2021,143(6):4261-4272
Journal of Thermal Analysis and Calorimetry - Nanofluids are attractive alternatives for the current heat transfer fluids due to their remarkably higher thermal conductivity which leads to the... 相似文献
2.
A technique was developed for the dissolution of Al-Fe materials containing difficult to dissolve Al2O3. The developed procedure uses HCl and HNO3 for initial sample attack followed by digestion with a mixture of H3PO4 and H2SO4 at 200?°C. This procedure was employe to dissolve Al-Fe material samples before the determination of Al and Fe. Minor and trace elements (B, Cr, Cu, Mo, Si, Zr) were determined after dissolution in HCl and HNO3. Results of a round robin study verified the procedure accuracy. The developed methods have the required accuracy and precision to be used as a quality control procedure for Al-Fe materials analysis. 相似文献
3.
Ghalandari Mohammad Irandoost Shahrestani Misagh Maleki Akbar Safdari Shadloo Mostafa El Haj Assad Mamdouh 《Journal of Thermal Analysis and Calorimetry》2021,145(4):1837-1848
Journal of Thermal Analysis and Calorimetry - Heat exchangers are applicable in different industries and technologies, and their performance is influenced by different parameters. In addition to... 相似文献
4.
The rainbow schlieren deflectometry technique was used to measure oxygen concentrations in a laminar, isothermal helium jet
discharged vertically into ambient air. The concentration distributions were inferred from the color schlieren image by taking
into consideration the sampling interval and noise in measurements, especially near the jet center. Excellent quantitative
agreement was reached between measurements from schlieren and a continuous sampling probe. This work demonstrates the capability
of the schlieren technique for providing accurate, spatially-resolved, nonintrusive, full-field of view measurements of species
concentration in an isothermal binary system. Because the basic quantity measured is the refractive index, the present schlieren
technique can be extended for quantitative measurements of other scalar flow properties related to the refractive index.
Received: 21 April 1997 / Accepted: 14 November 1997 相似文献
5.
We have experimentally demonstrated how two beams of light separated by an octave in frequency can become entangled after their interaction in a chi;{(2)} nonlinear medium. The entangler was a nonlinear optical resonator that was strongly driven by coherent light at the fundamental and second-harmonic wavelengths. An interconversion between the fields created quantum correlations in the amplitude and phase quadratures, which were measured by two independent homodyne detectors. Analysis of the resulting correlation matrix revealed a wave function inseparability of 0.74(1)<1, thereby satisfying the criterion of entanglement. 相似文献
6.
Yang Chunxiao Taralova Ina El Assad Safwan Loiseau Jean-Jacques 《Nonlinear dynamics》2022,109(3):2103-2127
Nonlinear Dynamics - Nonlinear dynamic systems and chaotic systems have been quite exhaustively researched in the domain of cryptography. However, the possibility of using fractional chaotic... 相似文献
7.
Bani Hani Ehab Hussein Alhuyi Nazari Mohammad Assad Mamdouh El Haj Forootan Fard Habib Maleki Akbar 《Journal of Thermal Analysis and Calorimetry》2022,147(22):12285-12300
Journal of Thermal Analysis and Calorimetry - Dryers are utilized in food industry and agriculture in order to extend the useful lifespan of corps. Thermal energy is required for water removal in... 相似文献
8.
The high-precision uranium determination by reduction with ferrous sulfate in phosphoric acid and titration with dichromate, which is applicable to nuclear-grade uranium compounds in which the uranium exists nearly exclusively as U(IV), has been modified. The modification enlarges the range of applicability of the original method to include the analysis of uranium compounds in which the uranium exists as U(VI) or as a mixture of U(IV) and U(VI), such as U3O8. The modified method has the same precision, relative freedom from interferences and applicability for routine use as the original method. 相似文献
9.
A. S. Al-Ammar E. Reitznerová R. M. Barnes 《Journal of Radioanalytical and Nuclear Chemistry》2000,244(2):267-272
Two sample treatment methods are evaluated to provide accurate boron determination at low concentrations in biological and botanical samples. The first approach is a hot 1M nitric acid extraction of boron from the sample. The second technique uses wet digestion with concentrated sulfuric acid. The accuracy of the procedures was demonstrated with botanical and animal reference materials (Corn Bran RM 8433 and Whole Egg Powder RM 8415). At least three results are given for each reference material. Two are direct measurements of B using independent 10B and 11B calibration curves with a Be internal reference, and the third is obtained by isotope dilution mass spectrometry (IDMS). The 10B and 11B values are consistent for both acid treatment procedures. The IDMS results also are consistent. Overall results for Whole Egg Powder and Corn Bran RM's match the best-estimate values within their confidence intervals. These results demonstrate the ability to measure B accurately at the 0.3 µg/g concentration range. Thus, low-level B samples can be analyzed with accuracy and precision by the two approaches. These methods introduce very little dissolved organic carbon (DOC) in the final solution and allow the use of large (2 g) sample aliquots. Direct introduction of biological fluids including whole blood serum also was evaluated critically for the determination of B. 相似文献
10.
New steroidal alkaloids from Fritillaria imperialis and their cholinesterase inhibiting activities 总被引:3,自引:0,他引:3
Atta-Ur-Rahman Akhtar MN Choudhary MI Tsuda Y Sener B Khalid A Parvez M 《Chemical & pharmaceutical bulletin》2002,50(8):1013-1016
Two new cevanine steroidal alkaloids, impericine (1) and forticine (2) along with known bases delavine (3), persicanidine A (4), and imperialine (5) were isolated from the bulbs of Fritillaria imperialis. The structures of impericine (1) [(20R,22S,25S)-5alpha-cevanin-23-ene-3beta,6beta,16beta-triol] and forticine (2) [(20S,22S,25S)-5alpha-cevanine-3beta,6beta-diol] were determined with the help of spectroscopic studies. These steroidal bases showed anti-acetylcholinesterase and anti-butyrylcholinesterase inhibitory activity. 相似文献