Iranian Journal of Science and Technology, Transactions A: Science最新文献

The ¹⁷O (p, γ)¹⁸F radiative capture reaction, a key driver of stellar nucleosynthesis, is comprehensively investigated at astrophysically relevant energies using a sophisticated theoretical approach. The Woods-Saxon potential model is employed to accurately deduce the cross-section for this reaction, which is essential for modeling hydrogen burning and isotope synthesis in stars. The calculated astrophysical S factor, a critical parameter for analyzing such reactions, exhibits excellent agreement with available experimental data and predictions from other models. Moreover, the electric dipole (E1) transition strength, governing the astrophysical S factor, is computed within the 0-500 keV energy range. Extrapolation of the S factor to zero center-of-mass energy yields a value of 4.807keV.b for the dominant E1 transition through the ¹⁸F (1 excited state to the ground state (1⁺), consistent with previous studies. To investigate correlated transitions, calculations of S (0) values have been performed for excited state transitions, specifically from the (1⁻) state to the (2⁺) state, the 1⁻state to the 3⁺ state, and the (1⁻) state to the 1⁺ state. Additionally, S factor for E2 transitions have also been calculated. These results provide invaluable nuclear data inputs for modeling stellar nucleosynthesis processes.

A bounded linear operator T on a Hilbert space H is said to be orbital frame if there exists a vector (x in H) such that orb(T, x) is a frame. This paper presents a new examination of frames in the context of Hilbert spaces, showing that orbital frames operators must be Fredholm. In particular, if an orbital frame operator either has a dense range or be one-to-one then it is an invertible.

The present research study evaluated the effects of benzylaminopurine (BAP) in combination with naphthalene acetic acid (NAA), as well as methyl jasmonate and nano-sized TiO₂ elicitors on callus induction, pharmaceutically important flavones and rosmarinic acid in leaf-derived calli of Teucrium polium. The feed-forward Artificial Neural Network (ANN) model was also applied to predict the effects of hormones and elicitors on phenolic compounds production. The best callus induction was achieved with media fortified with 1.5 mg L^− 1 BAP plus 0.5 mg L^− 1 NAA, followed by 1.5 mg L^− 1 BAP. Biochemical features and rosmarinic acid have substantially raised by the maximum ones in calli elicited with methyl jasmonate (50 µM). The exception was phenolic acids possessed much greater content in 10 mgL^− 1 nano-sized TiO₂-treated calli. High antioxidant activities (IC₅₀ 2.066 ± 0.24 µg mL^− 1 and 383.79 ± 33.60 mg Fe^+ 2 100 g^− 1 DW), with approximately 2- and 1.5-fold increases compared to controls, were observed in hydromethanolic extracts of calli elicited by 50 µM methyl jasmonate on an MS medium containing 1.5 mg L^− 1 BAP plus 0.5 mg L^− 1 NAA. Likewise, the highest contents of anti-genotoxic flavones apigenin and luteolin were measured in callus pretreated with 50 µM methyl jasmonate on the media supplemented with 1 mg L^− 1 BAP (180.67 ± 2.52 and 201.11 ± 3.63 µg100 g^− 1 extract, respectively) and 1.5 mg L^− 1 BAP plus 0.5 mg L^− 1 NAA (206.01 ± 7 and 256.22 ± 2.1 µg 100 g^− 1 extract, respectively). The ANN with hyperbolic-tangent (10-1-3) activation function (r² 0.99, SSE 0.01, and RE 0.001) showed a strong correlation between the ANN model outputs and the experimental amounts of polyphenols, ortho-diphenols, and phenolic acids.

The occupational hazard of coal mine dust not only poses a serious threat to miners’ health but also gives rise to various social issues. Considering the significance of group dynamics (GD), this study presents a driving framework for collaborative prevention and control of dust (CPCD) in miners, encompassing the internal force field (IFF), situational force field (SFF), and GD. Through qualitative analysis, the relationships among these driving elements are examined using statistical analysis methods and corresponding tests and corrections conducted on a dataset comprising 1055 samples. The empirical analysis reveals the following: (1) There is a moderate to strong correlation between CPCD and GD, SFF, and IFF. (2) The SFF, IFF, and GD significantly predict CPCD. (3) GD acts as a significant mediator between IFF and CPCD, and The IFF influences CPCD through GD. (4) The SFF positively regulates the impact of IFF on GD. By delving into miners’ participation behavior and gaining a contextualized understanding of collaborative prevention and control of dust, this research provides theoretical and empirical references for individual miners, coal mine enterprises, and governments to mitigate and manage occupational hazards related to dust effectively.

Zarshouran gold deposit is located 42 km north of Takab in NW Iran recognized as one of the most significant gold deposits in Iran. This ore has the gold grade of 2.4 gr/t which contains sulfide minerals such as pyrite and arsenopyrite. The gold recovery is less than 80% due to the association of gold in sulfide minerals. The aim of this research is to investigate the oxidation of sulfide minerals from the Zarshouran gold mine using the ferric-ionic acid system prior to the cyanidation process. Consequently, an experimental design was employed to investigate and optimize the key parameters affecting the oxidation of resistant ore by ferric ion including ferric ion concentration, pH, pulp solid percentage, temperature, and time. The results indicated that pH, iron sulfate concentration, pulp solid percentage, temperature, and time significantly influence gold recovery, respectively. Following oxidation with ferric ion and the cyanidation process under optimal conditions (iron sulfate concentration of 4 gr/t, temperature of 42 degrees Celsius, time of 6 h, pulp solid percentage of 15%, and pH of 1%), gold recovery improved from 41 to 67.85%.

In this paper, we establish some necessary and sufficient conditions for multiply warped product manifolds admitting a gradient Ricci-Yamabe soliton. For this purpose, the potential function of this soliton and the conditions that must be satisfied for each component of the multiply warped product manifold are investigated. As physical applications, multiply generalized Robertson–Walker spacetimes and generalized Reissner-Nordström spacetimes are discussed and results regarding the existence of gradient Ricci-Yamabe solitons on them are obtained.

Let ({mathfrak {R}}={mathbb {Z}}_{2}+u{mathbb {Z}}_{2}), where (u^2=0), and ({textbf {S}}={mathbb {Z}}_{2}+u{mathbb {Z}}_{2}+v{mathbb {Z}}_{2}+uv{mathbb {Z}}_{2}), where (u^{2}=v^{2}=0), (uv=vu). In this article, we study ({mathfrak {R}} {textbf {S}})-additive cyclic, additive constacyclic, and additive dual codes. We find the structural properties of these codes. The code C is characterized as an ({textbf {S}}[y])-submodules of the ring ({textbf {S}}_{beta _{1},beta _{2}}={{mathfrak {R}}[y]/langle y^{beta _{1}}-1rangle }times {{textbf {S}}[y]/langle y^{beta _{2}}-1rangle }). We define the extended Gray map (Psi _{1}:{mathfrak {R}}^{beta _{1}}times {textbf {S}}^{beta _2}longrightarrow {mathbb {Z}}_{2}^{n}) and use this map to find the binary images with good parameters. We also obtain the minimal generating polynomials and minimal spanning sets of the above-mentioned codes. Further, we provide some examples to support of ({mathfrak {R}} {textbf {S}})-additive cyclic codes. Finally, we present a Table 1 of optimal binary codes.

In this paper, the ultraspherical wavelet operational matrix of derivative method is proposed for the solution of non-linear ordinary differential equation arising in the study of heat transfer through a ternary hybrid nanofluid flow over a moving wet porous fin under the influence of magnetic field with natural convection and radiation. The proposed technique is applied to the test problem having the exact solution and the solution obtained is very close to the exact solution. The considered fin problem is solved using UWOMDM and the result obtained for certain fixed parameters are compared and found to be in good agreement with the result given in the literature. The comparisons validate the UWOMDM. The influence of various physical aspects on thermal distribution and heat transmission rate of the ternary hybrid nanofluid over the straight moving fin is studied. It is inferred that the ternary hybrid nanofluid provides better heat transfer followed by hybrid and mono nanofluids. Ternary hybrid nanofluid with platelet shape allows more heat transfer followed by cylindrical and spherical shapes. Improving Peclet number by 800% increases the fin tip temperature by 2.955%. Hartmann number, convective and radiation parameters help for faster cooling the fin. The heat transmission rate at the fin base escalates for higher Hartmann number, wet porous parameter, convective parameter and radiation parameter and declines for higher Peclet number.

The primary aim of this study is to determine the radii of k-starlikeness, k-uniform convexity, and the radii of starlikeness and convexity related to the exponential function for the Barnes G-Function. The findings presented in this study are novel, and their significance is illustrated by several interesting consequences, examples and graphical representations.

In this article, a spectral function for the singular impulsive dynamic Dirac system is obtained. In terms of this function, the Parseval equality and expansion formula in eigenfunctions is given.