Particle-hole condensates of higher angular momentum in hexagonal systems

Hexagonal lattice systems (e.g. triangular, honeycomb, kagome) possess a multidimensional irreducible representation corresponding to $d_{x^2-y^2}$ and $d_{xy}$ symmetry. Consequently, various unconventional phases that combine these $d$-wave representations can occur, and in so doing may break time-reversal and spin rotation symmetries. We show that hexagonal lattice systems with extended repulsive interactions can exhibit instabilities in the particle-hole channel to phases with either $d_{x^2-y^2}+d_{xy}$ or $d+id$ symmetry. When lattice translational symmetry is preserved, the phase corresponds to nematic order in the spin-channel with broken time-reversal symmetry, known as the $\beta$ phase. On the other hand, lattice translation symmetry can be broken, resulting in various $d_{x^2-y^2}+d_{xy}$ density wave orders. In the weak-coupling limit, when the Fermi surface lies close to a van Hove singularity, instabilities of both types are obtained in a controlled fashion.Comment: 6 pages, 3 figures. Journal reference adde

Extension of Ruiz Criterion for Evaluation of 3-D Fretting Fatigue Damage Parameter

AbstractFretting fatigue is an important consideration in the design and optimization of mechanical systems and assemblies in the recent times. Empirical approaches, multi-axial fatigue considerations and fracture mechanics approaches are considered for assessing fretting fatigue damages at contact interfaces of assemblies. Ruiz criteria is an effective empirical approach for evaluation of Fretting Fatigue Damage Parameter (FFDP) and has been demonstrated in two dimensional fretting studies of a typical dovetail interface problem. The current paper considers the extension of Ruiz criterion for assessing fretting fatigue damage parameter for three dimensional problems. Two approaches viz. summation of FFDP computed independently along the two slip directions and combined maximum principal-shear stress approach have been proposed for the FFDP evaluation, considering three dimensional stress and slip components over contact interface. FFDP evaluation using maximum principal-shear stress approach is observed to be more appropriate for three dimensional problem

A model approach to groundwater quality of Anekal Taluk, Bangalore Urban district

Application of linear regression anal. is very much significant to construct the predictive model using the present groundwater quality data from which, helps to predict the futuristic quality of groundwater of particular area. Here, 1026 groundwater samples of 272 villages were collected and analyzed for 14 parameters for physico-​chem. and biol. quality of groundwater. Karl-​Pearson Correlation coeffs., r, were used and attempts were made to develop the linear regression equations (y = Ax + B) for significantly correlated parameters. The results of the linear model emphasizes a pos. and significant correlation among the water quality parameters

Testability Analysis of Synchronous Sequential Circuits Based On Structural Data

Bounds on test sequence length can be used as a testability measure. We give a procedure to compute the upper bound on test sequence length for an arbitrary sequential circuit. We prove that the bound is exact for a certain class of circuits. Three design rules are specified to yield circuits with lower test sequence bounds

Some developmental stages of Caranx kalla Cuv. & Val.

These fish, when disturbed, were found to take shelter under the bell of the medusae. Judging from their movements, however, it may be mentioned that they seem to be cautious while moving about inside the bell, probably to avoid the stinging cells of the medusae. It is weIl-known that several species of carangids gather around floating objects such as, pieces of wood, coconut shell, medusae, etc_ and the principle of lure-line fishing is basea on this peculiar habit of carangids

AN ANALYSIS TO URBAN TRANSPORT PROBLEMS AND CHALLENGES IN INDIA

Cities and towns play an energetic role in promoting economic growth and wealth. Although less than a third of India's people live in cities and towns, these regions generate more than two-thirds of the country's 90% of the income and revenue of the government. In the years to come, as India becomes more and more urbanised, urban areas will play an important role in maintaining a high rate of economic growth. But, the pace of economic growth can be maintained if and only if cities function efficiently – that their resources are used to maximize the contribution of cities to national income. urban efficiency to a huge extent Much be contingent on the effectiveness of transportation systems, that is, the efficacy with which people and goods are moved throughout the city. Poor transportation systems impede economic growth and development, and the net effect can be loss of competitiveness in both domestic as well as international markets. Although vehicle proprietorship rates, the number of vehicles per capita, in Indian cities are lesser than their counterparts in developed countries, they suffer from worse congestion, delays, pollution and accidents than cities. industrial world. This paper provides an impression of the issues and challenges of urban transport in India. This paper first reviews leanings in vehicular development and availability of transport infrastructure in Indian cities. This is followed by an argument on the nature and greatness of urban transport problems such as overcrowding, effluence and road accidents. build on Background The paper proposes policy measures to improve urban transport in India