Shape changing nonlocal molecular deformations in a nematic liquid crystal system

Abstract The nature of nonlinear molecular deformations in a homeotropically aligned nematic liquid crystal (NLC) is presented. We start from the basic dynamical equation for the director axis of a NLC with elastic deformation and mapped onto a integro-differential perturbed Nonlinear Schrodinger equation which includes the nonlocal term. By invoking the modified extended tangent hyperbolic function method aided with symbolic computation, we obtain a series of solitary wave solutions. Under the influence of the nonlocality induced by the reorientation nonlinearity due to fluctuations in the molecular orientation, the solitary wave exhibits shape changing property for different choices of parameters. This intriguing property as a result of the relation between the coherence of the solitary deformation and the nonlocality reveals a strong need for a deeper understanding in the theory of self-localization in NLC systems

Magnetization reversal in a site-dependent anisotropic Heisenberg ferromagnet under electromagnetic wave propagation

Abstract Information density and switching of magnetization offers an interesting physical phenomenon which invoke magneto-optical techniques employed on the magnetic medium. In this paper, we explore the soliton assisted magnetization reversal in the nanosecond regime in the theoretical framework of the Landau–Lifshitz–Maxwell (LLM) model. Starting from the Landau–Lifshitz equation, we employ the reductive perturbation method to derive an inhomogeneous nonlinear Schrodinger equation, governing the nonlinear spin excitations of a site-dependent anisotropic ferromagnetic medium under the influence of electromagnetic (EM) field in the classical continuum limit. From the results, it is found that the soliton undergoes a flipping thereby indicating the occurrence of magnetization reversal behavior in the nanoscale regime due to the presence of inhomogeneity in the form of a linear function. Besides, the spin components of magnetization are also evolved as soliton spin excitations

Electrochemical synthesis and characterization of cubic magnetite nanoparticle in aqueous ferrous perchlorate medium

Abstract Electrochemical synthesis of cubic magnetite nanoparticle (MNP) in ferrous perchlorate aqueous medium and its spectral investigations have been carried out. The structural property of MNP is evidenced by X-ray diffraction pattern shows the characteristic peaks. Further the vibrational frequencies of MNP are evaluated using FT-IR and Raman spectroscopic techniques. UV–visible spectroscopic studies show the possibility of surface plasmon resonance effect. The cubic structure of MNP has been confirmed by transmission electron microscope (TEM) technique and it is also evidenced by scanning electron microscope (SEM). The as-synthesized MNP shows superparamagnetic property which is confirmed by the vibrating sample magnetometer, hence it could be useful for synthesis of very ultra superparamagnetic iron oxide solution (VUSPIO) for cancer treatment

Copepod Abundance and Diversity from Offshore Region of Tuticorin, South East Coast of India

A detailed study had been carried out on species abundance, biomass and composition of copepod in four different offshore stations namely, Station I: Vembar, II: Keelavaipar, III: Punnaikayal and IV: Thiruchendhur in Gulf of Mannar region from October 2011 to April 2012. A total of 56 copepod species belongs to 20 families under 4 orders have been encountered during the period. The percentage composition of different groups of copepod species was composed of Calanoida (35 numbers) 62.5%, Cyclopoida (4 numbers) 7.14%, Harpacticoida (8 numbers) 14.3% and Poecilostomatoida (9 numbers) 16.1%. The percentage of biomass composition of different groups of copepods during the study was in the order of Calanoida 38.99%, Harpacticoida 32.56%, Cyclopoida 15.22% and Poecilostomatoida 13.23%. In the case of species composition, Euterpina acutifrons (28.61%) was the most abundant species followed by Acrocalanus gracilis (17.68%), Corycaeus crassiusculus (12.33%), Oithona brevicornis (12.03%) and Temora turbinata (4.25%) were the other dominant species in observation. The copepod density in different stations were in the range of 8600–39900, 3900–64600, 3800–24800 and 5000–22500 numbers m-3 at station I, II, II and IV respectively. The lowest biomass of copepod was observed at station III and highest biomass was found at station II. The copepod species richness ranged from 0.48 to 2.72 and species diversity was in the range of 0.87 to 1.98 in the study areas. Species evenness was varied from 0.24 – 0.51 during the observation period

Adoption of Sea Cage, Culture Practices in Thoothukudi District Tamil Nadu: An Eye Opener for Income Generation

Adoption of Sea Cage, Culture Practices in Thoothukudi District Tamil Nadu: An Eye Opener for Income Generatio

Tensions of Integration in Professional Formation: Investigating Development of Engineering Students\u27 Social and Technical Perceptions

Tensions of Integration in Professional Formation: Investigating Development of Engineering Students\u27 Social and Technical PerceptionsTwenty-first century engineers face incredible challenges and opportunities, many of which aresocially complex, transcending the traditional “technical” boundaries of engineering. Thetechnology produced by engineers must not only function as predicted by mathematical andtheoretical models but must also operate beneficially and seamlessly in complex social contexts.In this sense, engineers must embody an integrated social and technical – or sociotechnical –identity rather than a dualistic social/technical one.A growing body of scholarship has discussed how dominant cultures of engineering shapestudents’ and professionals’ understandings of social and technical dimensions of their work.Further, engineering education research has advanced understanding of how engineering identityis formed by external, structural forces. Yet, from a psychological perspective, we know littleabout how engineering students come to perceive and embody their identities as engineers,especially in relation to social and technical dimensions of these identities. Thus, we organizedthis study around the following research questions.RQ0: How do students psychologically experience identity trajectories of becoming engineers?RQ1: How do students perceive the social and technical features of engineering identity?RQ2: How do students internally experience their identities as engineers, particularly with regard to social and technical dimensions of these identities?RQ3: How do social and technical perceptions of their engineering identity develop and change in the course of the engineering curriculum or in the transition to the workplace?To respond to these research questions, we have conducted two longitudinal studies usinginterpretative phenomenological analysis (IPA). One study focused on graduating seniors as theytransitioned into the workplace, and the second study focused on first-year students transitioningto engineering degree coursework. These investigations produced robust and nuancedunderstanding of students’ engineering identity trajectories throughout and beyond thecurriculum. These findings are being leveraged in order to provide our initial understanding in athematic analysis on sophomore engineering students.Thus far, the findings of the investigation highlight the complexity of becoming both engineers,specifically by demonstrating a somewhat contradictory relationship between what participantsperceived to be engineering and how they actually embodied an engineering-self. They furtherdemonstrate the manifold ways that participants realized and prioritized identities outside ofengineering and how these multiple selves interacted in ways that affected their engineeringidentities. Additionally, findings for both male and female groups suggest that somepsychological patterns might be related to gender. In sum, the findings depict a complex pictureof engineering-students-turned-engineers as whole persons. By focusing on how engineeringidentity development is embodied, the findings generate multiple theoretical insights that bearrelevance for engineering education research and provocative implications that bear significancefor engineering educators, students, and employers

Account of bivalve fishery resources of Southern Tamil Nadu

Account of bivalve fishery resources of Southern Tamil Nad

Incidence of amyloodiniosis in snubnose pompano juveniles and its effective control in marine hatchery

Amyloodiniosis infection in snubnose pompano was reported in marine fish hatcheries of ICAR-CMFRI during preparation for certain feeding experiments in this fish that is of aquaculture importance. The control and elimination of Amyloodinium sp. from the hatchery system is a herculean but vital task and several methods were carried out following the infection.These were evaluated for their usefulness and are reported below

Development of feed for blue swimmer crab, Portunus pelagicus to reduce the dependency on fresh feeds for sustainable mariculture

Development of feed for blue swimmer crab, Portunus pelagicus to reduce the dependency on fresh feeds for sustainable maricultur

Biometrics and Radiographic Studies on the teratology of Starfish (Pentaceraster affinis) from Thoothukudi Coast of Gulf of Mannar, India

Biometrics and Radiographic Studies on the teratology of Starfish (Pentaceraster affinis) from Thoothukudi Coast of Gulf of Mannar, Indi