The term photonic crystals appears because of the analogy between electron waves in crystals and the light waves in artificial periodic dielectric structures. During the recent years the investigation of one-, two-and three-dimensional periodic structures has attracted a widespread attention of the world optics community because of great potentiality of such structures in advanced applied optical fields. The interest in periodic structures has been stimulated by the fast development of semiconductor technology that now allows the fabrication of artificial structures, whose period is comparable with the wavelength of light in the visible and infrared ranges.

http://ieeexplore.ieee.org/iel5/6354/16969/00781867.pdf

Photonic crystals

Introduction to linear and nonlinear programming

Nuclear forces can be systematically derived using effective chiral Lagrangians consistent with the symmetries of QCD. I review the status of the calculations for two- and three-nucleon forces and their applications in few-nucleon systems. I also address issues like the quark mass dependence of the nuclear forces and resonance saturation for four-nucleon operators.

/pdf/modern-theory-of-nuclear-forces-436h635pm0.pdf

Modern theory of nuclear forces

The literature on “entrepreneurial opportunities” has grown rapidly since the publication of Shane and Venkataraman (2000). By directing attention to the earliest stages of development of new economic activities and organizations, this marks sound redirection of entrepreneurship research. However, our review shows that theoretical and empirical progress has been limited on important aspects of the role of “opportunities” and their interaction with actors, i.e., the “nexus”. We argue that this is rooted in inherent and inescapable problems with the “opportunity” construct itself, when applied in the context of a prospective, micro-level (i.e., individual[s], venture, or individual–venture dyad) view of entrepreneurial processes. We therefore suggest a fundamental re-conceptualization using the constructs External Enablers, New Venture Ideas, and Opportunity Confidence to capture the many important ideas commonly discussed under the “opportunity” label. This re-conceptualization makes important distinctions where prior conceptions have been blurred: between explananda and explanantia; between actor and the entity acted upon; between external conditions and subjective perceptions, and between the contents and the favorability of the entity acted upon. These distinctions facilitate theoretical precision and can guide empirical investigation towards more fruitful designs.

Entrepreneurial opportunities and the entrepreneurship nexus : a re-conceptualization

For the last decades, nanocomposites materials have been widely studied in the scientific literature as they provide substantial properties enhancements, even at low nanoparticles content. Their performance depends on a number of parameters but the nanoparticles dispersion and distribution state remains the key challenge in order to obtain the full nanocomposites’ potential in terms of, e.g., flame retardance, mechanical, barrier and thermal properties, etc., that would allow extending their use in the industry. While the amount of existing research and indeed review papers regarding the formulation of nanocomposites is already significant, after listing the most common applications, this review focuses more in-depth on the properties and materials of relevance in three target sectors: packaging, solar energy and automotive. In terms of advances in the processing of nanocomposites, this review discusses various enhancement technologies such as the use of ultrasounds for in-process nanoparticles dispersion. In the case of nanocoatings, it describes the different conventionally used processes as well as nanoparticles deposition by electro-hydrodynamic processing. All in all, this review gives the basics both in terms of composition and of processing aspects to reach optimal properties for using nanocomposites in the selected applications. As an outlook, up-to-date nanosafety issues are discussed.

/pdf/review-on-the-processing-and-properties-of-polymer-5e2mpcjjxh.pdf

Review on the Processing and Properties of Polymer Nanocomposites and Nanocoatings and Their Applications in the Packaging, Automotive and Solar Energy Fields.

Nano-scale antennas or build more informationdense data- storage devices. Optoelectronics could also have exotic applications such as the ability to couple an electronic signal to an individual molecule or the creation of biological circuits. In this paper the effective permittivity for a material with two types of inclusions having two different electric polarizabilities have been calculated. Possible applications would include direct processing of optical signals with nanoantennas, nano-circuit-filters, nano-resonators, and even nanoscaled negative-index optical structures.

Resonant Nano-particles Spheres as a Component of Nano-circuits

The reaction rate of the 3 He − α radiation capture process has been calculated in astrophysical energies using the pionless Effective Field Theory (EFT) and applying the Faddeev equation approach up to Next-to Leading Order (NLO) while taking Coulomb interaction into account. The ﬁndings for the E 1 and E 2 transitions to the 7 Be ground state have been normalized using NACRE 1999 experimental data and compared to the certain theoretical and experimental data.

Thermonuclear reaction rate of the 3 He (α, γ ) 7 Be process

Familial adenomatous polyposis (FAP) is an autosomal dominant colorectal cancer syndrome that is characterized by the development of multiple adenomas in the colon and rectum with high penetrance rates. This disease has specific features like the occurrence of pathogenic variations in the APC gene and diverse FAP phenotypes due to the occurrence region. In this study we aimed to evaluate pathogenic variants in exons of the APC gene in Iranian patients with FAP. A total of 35 FAP individuals were referred to the gastroenterology ward of Taleghani Hospital. As the aim of the study was to study the germline variations in the participants, the peripheral blood was collected and after the DNA extraction, PCR, and Sanger sequencing processes for the APC gene, the results were evaluated by the ACMG classification guidelines to report their pathogenicity. Accordingly, out of eight specific detected variants, three of them were novel, and the rest were reported previously. These eight variants were all truncating protein and pathogenic, and they were limited to 849-1378 codons. Overall, detected variants revealed discrepancies and parallels with previous reported cases in terms of quantity, occurrence region, and association with demographic and clinicopathological characteristics of patients. The spectrum of detected variants and the patient's phenotype showed distinct characteristics, such as occurrence in specific regions and the absence of extracolonic symptoms like Congenital hypertrophy of the retinal pigment epithelium (CHRPE). These findings open the path to comprehending the typical symptoms, their rarity, and their occurrence in the Iranian population and also due to the facts, we found that the studying of the APC gene alone for diagnosing FAP disease is not sufficient, and considering other genes are completely rational in the case of sequencing and studying the variants.

An update of the variant spectrum of the APC gene in Iranian familial adenomatous polyposis patients.

We report on the design of spherical composite particles (SCPs) which consist of a homogeneous distribution of metal nano-particles (Ag) in a dielectric matrix. The effective dielectric function of SCPs is described by Maxwell–Garnett effective medium theory. Within the context of Mie scattering, the extinction efficiency of SCPs in air can be specified which exhibits two different kinds of resonances;localized surface plasmon resonances (LSPRs) and dielectric resonances (DRs). Both kinds of resonances can be tuned through the permittivity of the dielectric matrix, filling fraction of the metal nano-particles, and the radius of SCPs. The special features of the localized resonances of SCPs have the potential to be used in a wide variety of applications.

Tunable Localized Resonances of Spherical Composite Particles at Optical and Near-Infrared Frequencies

We have investigated the $$^3\hbox{He} (\alpha ,\gamma ) ^7\hbox{Be}$$ radiative capture reaction using the pionless Effective Field Theory (EFT). The amplitude, cross-section, and S-factor for the $$E_1$$ and $$E_2$$ transitions to the $$^{7}\hbox{Be}$$ ground state have been computed using the Faddeev equation approach up to Next-to Leading Order in the astrophysical energy range. Our aim has been the study of Coulomb interaction effects and the contribution of EFT higher-order calculations in optimizing the results. The computed S-factor for the reaction agrees with experimental data and previous theoretical calculations. 


              
                
              
              $$^{3}\hbox{He} - \alpha $$
              
                
                  
                    
                    3
                  
                  He
                  -
                  α
                
              
    

Hossein Sadeghi

Papers

Resonant Nano-particles Spheres as a Component of Nano-circuits

Thermonuclear reaction rate of the 3 He (α, γ ) 7 Be process

An update of the variant spectrum of the APC gene in Iranian familial adenomatous polyposis patients.

Tunable Localized Resonances of Spherical Composite Particles at Optical and Near-Infrared Frequencies

$$^{3}\hbox{He} - \alpha $$ 3 He - α