Abstract The paper examines the dynamics of asymmetric thin shell wormholes that connect two distinct spacetimes using the cut and paste technique. The focus is on analyzing the linear stability of ...these wormholes by considering radial perturbations and utilizing the modified generalized Chaplygin gas equation of state. The specific case of an asymmetric wormhole connecting Schwarzschild–Rindler spacetime to Schwarzschild–Rindler–de Sitter space–time is analyzed using this formalism. Our investigation uncovers the existence of both stable and unstable regions, which are contingent upon the appropriate selection of various parameters within the metric spacetime and equation of state. Additionally, we determine that stability regions exist as a consequence of the square speed of sound. By increasing the value of the cosmological constant, the stability region is expanded. Furthermore, the stability regions are augmented by the influence of Rindler parameters, while the stability regions are also affected by adjustments in the equation of state parameters, leading to their enlargement.
Drought stress is an important challenge to global food security and agricultural output, and dramatic and rapid climate change has made the problem worse, causing unexpected impacts on the growth, ...development, and yield of different plants. Understanding the biochemical, ecological, and physiological reactions to these pressures is essential for improved management. Carbon materials’ impacts on plants subjected to different stresses are still poorly studied. Thus, this study was carried out investigate the feasibility of applying carbon nanotubes (CNTs) (0, 20, and 40 mg/L) as a foliar treatment for mitigating the effect of water stress (100%, 75%, and 50% irrigation water, IW) on peanut plants growing in sandy soil through assessments of growth and productivity and some physiological and biochemical measurements. Exposure of peanuts to decreased irrigation water led to significant decreases in growth, yield, photosynthetic pigments, indole acetic acid (IAA), and some nutritional components in peanut seeds, but increased levels of osmolytes such as total soluble carbohydrates (TSS) and proline, in addition to free amino acids and phenolics. However, foliar spraying with CNTs could ameliorate the impacts of decreased irrigation water on growth and production via enhancing the studied physiological parameters, such as photosynthetic pigments, IAA, osmolytes, and phenolics. Furthermore, the application of carbon nanotubes improved the nutrient contents, as expressed by the oil yield, protein yield, total carbohydrates, antioxidant activities (DPPH), B-carotene, lycopene, and flavonoids in peanut seeds, either under normal or water stress conditions. The higher level of CNTs (40 mg/L) was more effective than the lower one (20 mg/L) at increasing the above-mentioned parameters. In conclusion, foliar treatment with carbon nanotubes has the ability to enhance peanut drought tolerance and increase its growth and productivity under sandy soil conditions.
In this work, we investigate the dynamics of a spacecraft near two primary bodies. The massive body is considered to have a spherical shape, while the less massive one is elongated and modeled as a ...dipole. The dipole consists of two connected masses, one is spherical and the other is an oblate spheroid. The gravitational potential of the elongated body is determined by four independent parameters. To study the dynamics, we construct the equations of motion of a spacecraft with negligible mass under the effect of the current force model. The existence and locations of the equilibrium points are analyzed for various values of the system parameters. We found that the existence and locations of the points are affected by the system parameters. Also, we studied the linear stability of the equilibrium points. We found some stable collinear points when the oblateness parameter is negative, otherwise the points are not stable. We used the curves of zero velocity to identify the regions of allowed motion. Furthermore, we discussed the 2001 SN263 asteroid system and found some stable collinear points when the oblateness parameter is negative. In addition, the triangular points of the system are stable in a linear sense.
A zirconium molybdophosphate composite was designed for the selective recovery of uranium ions. The synthesized composite was well-characterized using SEM, EDX, FT-IR and XRD. U(VI) ions recovery ...from their aqueous solution by the studied composite was investigated in terms of adsorption isotherm, and thermodynamics. The composite is highly efficient and selective in U(VI) ions capturing with Langmuir adsorption capacity of 192.3 mg/g. Results showed that the composite is highly efficient in removal for U(VI) ions from Abu Rusheid leach liquor. As well as, it exhibits long-term stability, reusability, and fast kinetic in capturing of uranyl ions from leach liquor.
An alternative procedure was developed for selective leaching of uranium from carbonate-rich black shale of southwestern Sinai (0.16% U
3
O
8
). Uranium was present in the rock sample in the ...hexavalent state. This method is based on using a mixed citric acid/calcium citrate reagent so as to leave the carbonate, vanadium, and copper almost intact for the later processing. The influence of the concentration of citric acid/Ca citrate, molar ratio, grain size, pH of the leach liquor solutions, solid-to-liquid ratio, leaching time, and temperature was investigated in order to find optimum conditions. From the leach liquor, uranium can be recovered by addition of isopropyl alcohol.
Exploring the relationship between grain yield and heading date traits and their stability parameters at phenotypic, genetic, and molecular levels is the milestone for improving yield and adaptation ...in barley. We evaluated a mapping population comprising 298 doubled haploid lines in multienvironmental trials in Egypt. Composite interval mapping revealed 35 quantitative trait loci (QTLs) with four pleiotropic QTLs. A major QTL bPb‐9110 (140.3 cM on 3H) with a peak LOD greater than 24 was found to be associated with the stability statistics bi and R2 of heading date. Additionally, the marker bPb‐1213 on 1H was correlated to heading date, grain yield, and the statistic bi (GYP). We also found that the gene HvFT4 (2H, 66 cM) had a significant impact on the heading date due to the presence of exotic alleles. This gene was closely linked to the photoperiod Ppd‐H1 gene by 24.9 cM, and both genes play a major role in regulating flowering time in barley. Our results provide evidence that stability statistics pinpoint genetic control and appear promising for marker‐assisted selection.
Abstract Bioglass 45S5 is a silica-based bioactive glass capable of depositing a layer of hydroxyl carbonate apatite on the surface of the glass when immersed in body fluids. The present paper ...studies a new technique for treating early human dental enamel caries lesions by using a paste composed of 45S5 bioglass and phosphoric acid. Artificial caries lesions were induced in enamel flat surfaces by means of a decalcification solution. All specimens were exposed to a brushing-abrasion challenge to test the durability of any newly formed layer resulting from the application of 45S5 bioglass paste. The specimens treated with bioglass paste showed complete coverage with a layer of brushite crystals. The brushing-abrasion challenge did not statistically affect the percentage of enamel coverage with the crystalline layer formed by the application of bioglass ( p < 0.05). These crystals were converted to hydroxyapatite crystals when stored in artificial saliva for 14 days. The current technique suggests the possibility of restoring incipient enamel erosive lesion with an abrasion durable layer of hydroxyapatite crystals.
Perturbative width of open rigid strings Bakry, A. S.; Deliyergiyev, M. A.; Galal, A. A. ...
Physical review. D,
05/2022, Letnik:
105, Številka:
9
Journal Article
PDF
