Collaborative guarded-hot-plate tests between the Laboratoire national de métrologie et d’essais and the National Institute of Standards and Technology

Zarr, Robert R.; Guthrie, William F.; Hay, Bruno; Koenen, Alain

doi:10.1088/1681-7575/aa4e55

Cited by 7 publications

(5 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the following section, we present the results of the NIST test conducted on the sequence generated by the proposed system. This test was introduced by the National Institute of Standards and Technology [34]. The NIST test includes several quantities that are calculated and examines the behavior of the input sequences.…”

Section: Behavior Analysis Of Proposed Systemmentioning

confidence: 99%

Secure Multiple-Image Transfer by Hybrid Chaos System: Encryption and Visually Meaningful Images

Zareimani,

Parvaz

2024

Mathematics

View full text Add to dashboard Cite

The secure transmission of information is one of the most important topics in the field of information technology. Considering that images contain important visual information, it is crucial to create a safe platform for image transfer. One commonly employed tool to enhance the complexity and randomness in image encryption methods is the chaos system. The logistic and sine maps are utilized in encryption algorithms but these systems have some weaknesses, notably chaotic behavior in a confined area. In this study, to address these weaknesses, a hybrid system based on the Atangana–Baleanu fractional derivative is proposed. The various tests employed to evaluate the behavior of the new system, including the NIST test, histogram analysis, Lyapunov exponent calculation, and bifurcation diagram, demonstrate the efficiency of the proposed system. Furthermore, in comparison to the logistic and sine maps, the proposed hybrid exhibits chaotic behavior over a broader range. This system is utilized to establish a secure environment for the transmission of multiple images within an encryption algorithm, subsequently concealing them within a meaningful image. Various tools employed to assess the security of the proposed algorithm, including histogram analysis, NPCR, UACI, and correlation values, indicate that the proposed hybrid system has application value in encryption.

show abstract

Section: Behavior Analysis Of Proposed Systemmentioning

confidence: 99%

Secure Multiple-Image Transfer by Hybrid Chaos System: Encryption and Visually Meaningful Images

Zareimani,

Parvaz

2024

Mathematics

View full text Add to dashboard Cite

show abstract

“…These measurements can be carried out under steady-state or transient conditions. Steady-state measurements of thermal conductivity [2], [3] are based on temperature differences between the heated and unheated sides. The disadvantage of steady-state measurements is that they take a very long time.…”

Section: T Ambmentioning

confidence: 99%

Numerical modeling of the asymmetric hot plate method considering lateral convective losses

Dia

Diallo

Faye

et al. 2023

Preprint

View full text Add to dashboard Cite

In this study, a numerical model of the asymmetric hot plate method was developed to determine the thermal properties of materials. The proposed model considers the convective heat loss around the device. First, a numerical calculation code is developed to determine the temperature evolution at the measurement points. This calculation code is then used to perform a reduced sensitivity study on various parameters. The Levenberg-Marquardt algorithm was used to identify the thermal properties of different materials from the thermogram. The impacts of the convection coefficient h and insulation thickness on the calculation of the estimates were studied. Finally, an experimental study was conducted using several materials. The thermal properties were compared with experimental results obtained using other measurement methods. A satisfactory agreement was obtained.

show abstract

“…The thermal conductivity of construction materials was measured by using the guarded hot-plate (GHP) technique, which works on the principle proposed in the early 1900s by Dickinson and Van Dusen [33]. In this technique, a temperature gradient is applied on two opposing faces of the test sample, while the remaining faces are insulated.…”

Section: Boundary Conditionsmentioning

confidence: 99%

Computational Optimization of 3D-Printed Concrete Walls for Improved Building Thermal Performance

2022

View full text Add to dashboard Cite

Three-dimensional printing technologies are transforming various sectors with promising technological abilities and economic outcomes. For instance, 3D-printed concrete (3DPC) is revolutionizing the construction sector with a promise to cut projects’ costs and time. Therefore, 3DPC has been subjected to extensive research and development to optimize the mechanical and thermal performance of concrete walls produced by 3D printing. In this paper, we conduct a comparative investigation of the thermal performance of various infill structures of 3DPC walls. The targeted outcome is to produce an infill structure with optimized thermal performance to reduce building energy consumption without incurring additional material costs. Accordingly, a computational model is developed to simulate the thermal behavior of various infill structures that can be used for 3DPC walls. The concrete composition and the concrete-to-void fraction are maintained constant to focus on the impact of the infill structure (geometric variations). The thermal performance and energy-saving potential of the 3DPC walls are compared with conventional construction materials, including clay and concrete bricks. The results show that changing the infill structure of the 3DPC walls influences the walls’ thermal conductivity and, thereby, the building’s thermal performance. The thermal conductivity of the examined infill structures is found to vary between 0.122 to 0.17 W/m.K, while if these structures are successful in replacing conventional building materials, the minimum annual saving in energy cost will be about $1/m2. Therefore, selecting an infill structure can be essential for reducing building energy consumption.

show abstract

Collaborative guarded-hot-plate tests between the Laboratoire national de métrologie et d’essais and the National Institute of Standards and Technology

Cited by 7 publications

References 14 publications

Secure Multiple-Image Transfer by Hybrid Chaos System: Encryption and Visually Meaningful Images

Secure Multiple-Image Transfer by Hybrid Chaos System: Encryption and Visually Meaningful Images

Numerical modeling of the asymmetric hot plate method considering lateral convective losses

Computational Optimization of 3D-Printed Concrete Walls for Improved Building Thermal Performance

Contact Info

Product

Resources

About