in this study, the effects of particle size distribution improvement and dense packing techniques on the 28- and 90-day compressive strengths of class g oil well cement have been investigated. it was observed that limited improvements in the particle size distribution of cement (regarding industrial possibilities) cannot result in a significant increase in 28- and 90-day compressive strengths. ...

Ant colony algorithms are a class of metaheuristics which are inspired from the behavior of real ants. The original idea consisted in simulating the stigmergic communication, therefore these algorithms are considered as a form of adaptive memory programming. A new formalization is proposed for the design of ant colony algorithms, introducing the biological notions of heterarchy and communicatio...

In his Comment [1], Wójcik proposes two simple schemes for performing eavesdropping attacks to the Quantum Dense Key Distribution protocol (QDKD) in Ref. [2]. These schemes enable Eve to achieve a larger mutual information than Alice’s and Bob’s one, but maintaining inviolated the security condition (Eq. (6) in Ref. [2]). Eve’s attack in Wójcik’s schemes relies on the possibility of subtraction...

In this Comment we question the security of recently proposed by Degiovanni et al. [Phys. Rev. A 69 (2004) 032310] scheme of quantum dense key distribution. PACS number(s): 03.67.Hk, 03.65.Ud

Abstract The dense quantum entanglement distribution is the basis for practical communication, networks and distributed computation. To make processes stable enough large-scale applications, it necessary to perform them with integrated pattern. Here, we first integrate a wavelength-division demultiplexing system unbalanced Mach-Zehnder interferometers on one photonic chip demonstrate multi-chan...

In this study, the effects of particle size distribution improvement and dense packing techniques on the 28- and 90-day compressive strengths of class G oil well cement have been investigated. It was observed that limited improvements in the particle size distribution of cement (regarding industrial possibilities) cannot result in a significant increase in 28- and 90-day compressive strengths. ...

Considering the great significant role that routing protocols play in transfer rate and choosing the optimum path for exchange of data packages, and further in the amount of consumed energy in the routing protocol, the present study has focused on developing an efficient compound energy algorithm based on cluster structure which is called active node with cluster structure. The purpose of this ...