830 research outputs found
A Comparative Review of the Views about the Verses on Stoning Satans by Meteors
No full textThe present paper seeks to review the Quranic verses on stoning Satans by meteors and reanalyze different interpretive views about the issue, proposed by commentators and thinkers. The paper reviews the view of different scholars and commentators such as Seyyed Qutb, Makarem, Allamah Tabatabaii, Tabarsi, Abdulali Bazargan, Tantawi, Nasr Hamed Abuzeid, and Soroush. Some commentators have implicitly interpreted these verses and others have reviewed the outer meaning of the verses and relevant traditions, relying on detailed specification. Some others have interpreted them on the basis of new cosmological theories. Still others have relied on probable and hypothetical theories. And others have proposed inner meaning for the verses and have considered them as simile and maxim. On the contrary, some commentators hold that these verses cannot be interpreted. Among these views, those regarding the verses as maxim are worthy to be taken into consideration and the view that interprets and justifies the outer meaning of the verses on the basis of new scientific discoveries in the field of cosmology seems more acceptable and correct. Keyvan Ehsani[1] Maryam Parvizian[2] [1] Assistant professor of department of sciences of the Holy Quran and Hadith, Arak University, [email protected] [2] Corresponding author, MA student of sciences of the Holy Quran and Hadith, Arak University, [email protected]
Regularity of projection operators attached to worm domains
No full textThis paper considers the non-smooth unbounded worm domains
Dβ={(z1,z2)∈C2:Re(z1e−ilogz2z⎯⎯⎯2)>0,|logz2z⎯⎯2|<β−π2},
where β>π2. These model domains were important when the first author [Acta Math. 168 (1992), no. 1-2, 1–10; MR1149863] used them to show that on the Diederich-Fornæss worm domains [K. Diederich and J. E. Fornæss, Math. Ann. 225 (1977), no. 3, 275–292; MR0430315] the Bergman projection does not map the Sobolev space Wk into itself when k≥π/(total amount of winding). In the paper under review, the authors construct an oblique projection operator on Dβ which preserves the level of the Sobolev spaces. More precisely, let
L2j(Dβ)={f∈L2(Dβ):f∘ρθ=eijθf},
where ρθ=(z1,eiθz2) is a rotation on Dβ. Define Bj(Dβ):=L2j(Dβ)∩{holomorphic functions on Dβ}, Wsj(Dβ):=L2j(Dβ)∩Ws(Dβ), and Ws(Dβ) the closure of :=C∞0(Dβ) in Ws(Dβ). The main theorem of the paper shows that for all j∈Z there exists a bounded linear projection Tj:=L2(Dβ)→Bj(Dβ)
which satisfies Tj:Ws(Dβ)→Wsj(Dβ)for every s≥0
Dehydroepiandrosterone replacement therapy in older adults improves indices of arterial stiffness
No full textSerum dehydroepiandrosterone (DHEA) concentrations decrease approximately 80% between ages 25 and 75 year. Aging also results in an increase in arterial stiffness, which is an independent predictor of cardiovascular disease (CVD) risk and mortality. Therefore, it is conceivable that DHEA replacement in older adults could reduce arterial stiffness. We sought to determine whether DHEA replacement therapy in older adults reduces carotid augmentation index (AI) and carotid-femoral pulse wave velocity (PWV) as indices of arterial stiffness. A randomized, double-blind trial was conducted to study the effects of 50 mg day(-1) DHEA replacement on AI (n = 92) and PWV (n = 51) in women and men aged 65-75 year. Inflammatory cytokines and sex hormones were measured in fasting serum. AI decreased in the DHEA group, but not in the placebo group (difference between groups, -6 ± 2 AI units, P = 0.002). Pulse wave velocity also decreased (difference between groups, -3.5 ± 1.0 m s(-1) , P = 0.001); however, after adjusting for baseline values, the between-group comparison became nonsignificant (P = 0.20). The reductions in AI and PWV were accompanied by decreases in inflammatory cytokines (tumor necrosis factor α and IL-6, P < 0.05) and correlated with increases in serum DHEAS (r = -0.31 and -0.37, respectively, P < 0.05). The reductions in AI also correlated with free testosterone index (r = -0.23, P = 0.03). In conclusion, DHEA replacement in elderly men and women improves indices of arterial stiffness. Arterial stiffness increases with age and is an independent risk factor for CVD. Therefore, the improvements observed in this study suggest that DHEA replacement might partly reverse arterial aging and reduce CVD risk
Sensibilità e specificità della perimetria di soglia centrale rispetto all'analisi delle fibre nervose retiniche mediante oftalmoscopia a scansione laser nella diagnosi del glaucoma cronico semplice
No full textThree-dimensional volumetric analysis of mandibular condyle changes in growing subjects: A retrospective cross-sectional study
No full textObjective The purpose of this study is to analyze the mandibular condylar volumein a sample of subjects 11-26 years old. Methods CBCT condylescans from 94 patients (mean age 18.2 +/- 4.5 y) acquired with areconstructed layer thickness of 0.5 mm and a 512x512 matrix were examined. Data on condylar volume were compared among three groups with different age ranges: 11-16 years, 17-21years, and 22-26 years. Condylar volumetric measurements were performed with Mimics (TM) software. Results A significant increase in condylar volume from puberty to young adulthood was detected (p < 0.01). Females showed a higher condylar volume in the 17-21 y group compared with the 11-16 y group. Males showed differences among all three groups. Conclusion The mandibular condyle growth seems to continue at least until 17-21 years in males but seems to stop before 17 years in females
L'analisi delle fibre nervose retiniche mediante oftalmoscopia dinamica a scansione laser nella diagnosi del glaucoma cronico semplice : riproducibilità del metodo
No full textUS efficient factors in a Bayesian model scan framework
No full textPurpose: The author examines the impact these efficient factors have on factor model comparison tests in US returns using the Bayesian model scan approach of Chib et al. (2020), and Chib et al.(2022). Design/methodology/approach: Ehsani and Linnainmaa (2022) show that time-series efficient investment factors in US stock returns span and earn 40% higher Sharpe ratios than the original factors. Findings: The author shows that the optimal asset pricing model is an eight-factor model which contains efficient versions of the market factor, value factor (HML) and long-horizon behavioral factor (FIN). The findings show that efficient factors enhance the performance of US factor model performance. The top performing asset pricing model does not change in recent data. Originality/value: The author is the only one to examine if the efficient factors developed by Ehsani and Linnainmaa (2022) have an impact on model comparison tests in US stock returns
A hemodynamic comparison of young and older endurance athletes during exercise
No full text Page 2041: J. M. Hagberg, W. K. Allen, D. R. Seals, B. F. Hurley, A. A. Ehsani, and J. 0. Holloszy. “A hemodynamic comparison of young and older endurance athletes during exercise.” Page 2043: first sentence in the section entitled Vo2 max (Table 2) should read: The master athletes' Vo2 max was 9% lower than that of the matched young runners ( P < 0.01) when expressed either in milliliters per kilogram per minute, liters per minute, or milliliters per kilogram of LBW per minute. </jats:p
Solvothermal synthesis of MnFe2O4 nanoparticles: The role of polymer coating on morphology and magnetic properties
No full textManganese spinel ferrite nanoparticles were synthesized by a solvothermal route based on high temperature decomposition of metal nitrates in the presence of different contents of Triethylene glycol. This simple and low cost method can be applied to prepare large quantities of nanoparticles (tens of grams). Powder X-ray diffraction (PXRD) and Transmission Electron Microscopy (TEM) confirmed that nanoparticles with a good crystalline quality were obtained. A good agreement between the average particle size calculated by PXRD and TEM was observed. Fourier-transform infrared spectra showed that polymer molecules have the tendency to form bonds with the surface of ferrite nanoparticles reducing the surface spin disorder, and then enhancing the saturation magnetization (M-s). Therefore, much higher Ms value (up to similar to 91 emu/g at 5 K) was observed compared with that of bare nanoparticles without surfactant. The blocking temperature showed a remarkable shift to lower values with increasing the polymer starting amount. In addition, by increasing the polymer initial content, a more homogeneous size distribution was obtained and the initial strongly interacting superspin glass behavior changed to a weakly interacting superparamagnetic state
Short-term effect of orthodontic treatment with clear aligners on pain and semg activity of masticatory muscles
No full textBackground and objectives: The aim of this study is to evaluate mandibular elevator muscles activity and pain on palpation in the early stages of orthodontic treatment with clear aligners using surface electromyography (sEMG). Materials and methods: Surface electromyography (sEMG) activity and pain level on muscle palpation of masseter and anterior temporalis muscles were recorded in a sample of 16 adult subjects (aged 18–32 years; mean 22.5 +/− 3.5 SD) undergoing orthodontic treatment with clear aligners before the treatment (T0), after 1 month of treatment (two clear aligners) (T1), and after 3 months of treatment (T2) (six clear aligners). A chi-square test for nominal data, a Friedman test, and a Wilcoxon-signed rank test as post hoc analysis were applied. Results: No statistically significant differences in muscular pain were observed. At T1, the sEMG activity of masseter muscles at mandibular rest position showed a statistically significant reduction, but after 3 months (T2), the data appeared similar to T0 (p = 0.03 and p = 0.02). Conclusions: During the treatment with clear aligners, subjects could experience an initial reduction in the masseter basal activity after 1 month of treatment. This effect tends to decrease to baseline levels after 3 months of therapy
- …
