Search results

The electronic properties, exchange interactions, Curie temperatures and transport properties of random quaternary Heusler alloys (Ni, Cu)₂MnSn are studied by means of density-functional calculations over the entire range of dopant concentration. Results agree qualitatively as well as quantitatively with the available experimental data. The residual resistivity is found to obey the Nordheim rule, indicating weak-scattering regime. The temperature-dependent spin-disorder resistivity is found to be described well via the disordered model of local moments. Effect of pressure on the Curie temperature and the resistivity is also explored.

Importance sampling is a popular Monte Carlo method used in a variety of areas in econometrics. When the variance of the importance sampling estimator is infinite, the central limit theorem does not apply and estimates tend to be erratic even when the simulation size is large. The authors consider asymptotic trimming in such a setting. Specifically, the authors propose a bias-corrected tail-trimmed estimator such that it is consistent and has finite variance. The authors show that the proposed estimator is asymptotically normal, and has good finite-sample properties in a Monte Carlo study.

When several machine tools are serviced by one industrial robot their idle times should be kept as short as possible. In this paper, a deterministic model is developed to optimise the idle time, including the possibility of machine breakdowns.

A survey of papers and design‐for‐assembly systems shows where this discipline should be heading.

This study aims to assess the effect of supplier–buyer association on supply chain sustainability using the pharmaceutical industry in Ghana as a case study.

The study used a quantitative research approach. The study design was a cross-sectional survey design. The unit of analysis for the study was top-level managers of pharmaceutical companies in Ghana. By the use of the purposive and convenience sampling techniques, 90 respondents from pharmaceutical firms in Ghana were included. The study used descriptive statistics, t-test and regression tools in the data analysis.

It was discovered that trust mediates positively the relationship between supplier–buyer relationship and supply chain sustainability. Moreover, the study found that supplier–buyer relationship (SBR) has a significant and positive impact on supply chain sustainability.

The study concluded that SBR is the foundation upon which effective supply chain and supply chain sustainability are established.

This paper provides researchers with a contemporary perspective toward understanding the relationship between SBR and supply chain sustainability and the mediating role of trust.

In this paper, using Monte Carlo simulations (MCSs) under the metropolis algorithm, the authors study the magnetic properties of the yttrium-based Heusler alloys: Y₂CrGa and YFeCrGa. In the first step, the authors elaborate and discuss the ground-state phase diagrams of the more stable configurations. It is worth to note that the full-Heusler alloy Y₂CrGa contains only one magnetic atom (Cr), while the quaternary Heusler alloy YFeCrGa has two magnetic atoms (Cr and Fe). This leads to modeling of the compound Y₂CrGa by a Hamiltonian containing only one magnetic spin moment (S = 2), while the quaternary Heusler alloy YFeCrGa is modeled by a Hamiltonian containing two magnetic spin moments (Q = 5/2 and s = 2). The results of the study reveal that the critical temperature increases when increasing the reduced crystal field for the two studied compounds. To complete this study, the authors elaborated the hysteresis cycles of the two yttrium-based Heusler alloys: Y₂CrGa and YFeCrGa.

In this paper, the authors study the magnetic properties and the critical behavior of the yttrium-based Heusler alloys, Y₂CrGa and YFeCrGa, using MCSs under the metropolis algorithm. In the first step, the authors elaborate and discuss the ground-state phase diagrams of the more stable configurations for the both structures at null temperature (T = 0). On the other hand, for non-null temperature (T ≠ 0), the authors investigate the critical behavior of these two yttrium-based Heusler alloys: Y₂CrGa and YFeCrGa. It is worth to note that the full-Heusler alloy Y₂CrGa contains only one magnetic atom (Cr), while the quaternary Heusler alloy YFeCrGa has two magnetic atoms (Cr and Fe). Hence, the compound Y₂CrGa can be modeled by a Hamiltonian containing only one magnetic spin moment (S = 2), while the quaternary Heusler alloy YFeCrGa is modeled by a Hamiltonian containing two magnetic spin moments (Q = 5/2 and s = 2). Moreover, the results of the study reveal that the critical temperature increases when increasing the reduced crystal field for the two studied compounds. To complete this study, the authors elaborated the hysteresis cycles of the two yttrium-based Heusler alloys: Y₂CrGa and YFeCrGa.

The authors elaborate the ground-state phase diagrams of the more stable configurations. It is worth to note that the full-Heusler alloy Y₂CrGa contains only one magnetic atom (Cr), while the quaternary Heusler alloy YFeCrGa has two magnetic atoms (Cr and Fe). This leads to modeling of the compound Y₂CrGa by a Hamiltonian containing only one magnetic spin moment (S = 2), while the quaternary Heusler alloy YFeCrGa is modeled by a Hamiltonian containing two magnetic spin moments (Q = 5/2 and s = 2). The results of the study reveal that the critical temperature increases when increasing the reduced crystal field for the two studied compounds. To complete this study, the authors elaborated the hysteresis cycles of the two yttrium-based Heusler alloys: Y₂CrGa and YFeCrGa.

The authors elaborate the ground-state phase diagrams of the more stable configurations. It is worth to note that the full-Heusler alloy Y₂CrGa contains only one magnetic atom (Cr), while the quaternary Heusler alloy YFeCrGa has two magnetic atoms (Cr and Fe). This leads to modeling of the compound Y₂CrGa by a Hamiltonian containing only one magnetic spin moment (S = 2), while the quaternary Heusler alloy YFeCrGa is modeled by a Hamiltonian containing two magnetic spin moments (Q = 5/2 and s = 2). The results of the study reveal that the critical temperature increases when increasing the reduced crystal field for the two studied compounds. To complete this study, the authors elaborated the hysteresis cycles of the two yttrium-based Heusler alloys: Y₂CrGa and YFeCrGa.

The authors elaborate the ground-state phase diagrams of the more stable configurations. It is worth to note that the full-Heusler alloy Y₂CrGa contains only one magnetic atom (Cr), while the quaternary Heusler alloy YFeCrGa has two magnetic atoms (Cr and Fe). This leads to modeling of the compound Y₂CrGa by a Hamiltonian containing only one magnetic spin moment (S = 2), while the quaternary Heusler alloy YFeCrGa is modeled by a Hamiltonian containing two magnetic spin moments (Q = 5/2 and s = 2). The results of the study reveal that the critical temperature increases when increasing the reduced crystal field for the two studied compounds. To complete this study, the authors elaborated the hysteresis cycles of the two yttrium-based Heusler alloys: Y₂CrGa and YFeCrGa.

The authors elaborate the ground-state phase diagrams of the more stable configurations. It is worth to note that the full-Heusler alloy Y₂CrGa contains only one magnetic atom (Cr), while the quaternary Heusler alloy YFeCrGa has two magnetic atoms (Cr and Fe). This leads to modeling of the compound Y2CrGa by a Hamiltonian containing only one magnetic spin moment (S = 2), while the quaternary Heusler alloy YFeCrGa is modeled by a Hamiltonian containing two magnetic spin moments (Q = 5/2 and s = 2). The results of the study reveal that the critical temperature increases when increasing the reduced crystal field for the two studied compounds. To complete this study, the authors elaborated the hysteresis cycles of the two yttrium-based Heusler alloys: Y₂CrGa and YFeCrGa.

The authors elaborate the ground-state phase diagrams of the more stable configurations. It is worth to note that the full-Heusler alloy Y₂CrGa contains only one magnetic atom (Cr), while the quaternary Heusler alloy YFeCrGa has two magnetic atoms (Cr and Fe). This leads to modeling of the compound Y₂CrGa by a Hamiltonian containing only one magnetic spin moment (S = 2), while the quaternary Heusler alloy YFeCrGa is modeled by a Hamiltonian containing two magnetic spin moments (Q = 5/2 and s = 2). The results of the study reveal that the critical temperature increases when increasing the reduced crystal field for the two studied compounds. To complete this study, the authors elaborated the hysteresis cycles of the two yttrium-based Heusler alloys: Y₂CrGa and YFeCrGa.

To determine the electrical, structural, optical and transport properties calculated using WIEN2k code.

By employing the WIEN2k code, we have theoretically examined the physical properties of the full-Heusler Te₂AcGa alloy. The FP-LAPW technique is utilized for theoretical calculations.

An indirect bandgap of 0.42 eV is seen with the GGA potential. An enhancement in bandgap with a value of 0.97 eV is observed with mBJ potential. The density of states is determined to verify the band structure profile. The dynamical and structural stability is attained through the computations. The electron density contour plot is utilized to explore the bonding nature of the compound. Optical properties have been calculated with respective potentials showing significant absorption in the visible region. Furthermore, thermoelectric properties have been evaluated to confirm the potential of Te₂AcGa for thermoelectric devices. At elevated temperatures, the ZT with mBJ potential obtained a large value of 0.8.

High absorption and ZT values make the Te_2AcGa alloy have potential for optoelectronic and renewable energy devices.

In the submitted manuscript, first principle calculations are carried out for the first time to study the structural, dynamic, electronic, optical and thermoelectric properties of the full-Heusler Te₂AcGa alloy. Modified Becke–Johnson (mBJ) exchange-correlation potential provides very accurate results. The bandgap profiles and related properties are calculated in the present work. The entire work gives useful results of fundamental importance, which can be utilized for the fabrication of optoelectronic and thermoelectric applications.

A maturity model for Industry 4.0 (I4.0 MM) with influencing factors is designed to address maturity issues in adopting Industry 4.0. Standardisation in I4.0 supports manufacturing industry transformation, forming reference architecture models (RAMs). This paper aligns key factors and maturity levels in I4.0 MMs with reputable I4.0 RAMs to enhance strategy for I4.0 transformation and implementation.

Three steps of alignment consist of the systematic literature review (SLR) method to study the current published high-quality I4.0 MMs, the taxonomy development of I4.0 influencing factors by adapting and implementing the categorisation of system theories and aligning I4.0 MMs with RAMs.

The study discovered that different I4.0 MMs lead to varied organisational interpretations. Challenges and insights arise when aligning I4.0 MMs with RAMs. Aligning MM levels with RAM stages is a crucial milestone in the journey toward I4.0 transformation. Evidence indicates that I4.0 MMs and RAMs often overlook the cultural domain.

Findings contribute to the literature on aligning capabilities with implementation strategies while employing I4.0 MMs and RAMs. We use five RAMs (RAMI4.0, NIST-SME, IMSA, IVRA and IIRA), and as a common limitation in SLR, there could be a subjective bias in reading and selecting literature.

To fully leverage the capabilities of RAMs as part of the I4.0 implementation strategy, companies should initiate the process by undertaking a thorough needs assessment using I4.0 MMs.

The novelty of this paper lies in being the first to examine the alignment of I4.0 MMs with established RAMs. It offers valuable insights for improving I4.0 implementation strategies, especially for companies using both MMs and RAMs in their transformation efforts.

The examination and identification of solvents and binder resins in particular has been discussed in detail previously. It is the sole purpose of this section to indicate the means available for obtaining these substances from finished paints in such a way as to facilitate their analysis. For example, the ASTM (15) has published a standard procedure for examining the solvent portion of paints by direct injection on to a GC. In this case, so as to prevent blockage of the column by the resin and pigment components, the sample was injected either via a glass injection port sleeve or on to a glass wool plug positioned in the heated injection port. Hence solvent analysis could be carried out without the need to apply any preliminary separation procedures. If however, both solvent and binder resin are to be examined then a procedure for separating these constituents must be applied.