Finite temperature properties of the triangular lattice t-J model, applications to Nax_xCoO2_2

We present a finite temperature ($T$) study of the t-J model on the two-dimensional triangular lattice for the negative hopping $t$, as relevant for the electron-doped Na$_x$CoO$_2$ (NCO). To understand several aspects of this system, we study the $T$-dependent chemical potential, specific heat, magnetic susceptibility, and the dynamic Hall-coefficient across the entire doping range. We show systematically, how this simplest model for strongly correlated electrons describes a crossover as function of doping ($x$) from a Pauli-like weakly spin-correlated metal close to the band-limit (density $n=2$) to the Curie-Weiss metallic phase ($1.5<n<1.75$) with pronounced anti-ferromagnetic (AFM) correlations at low temperatures and Curie-Weiss type behavior in the high-temperature regime. Upon further reduction of the doping, a new energy scale, dominated by spin-interactions ($J$) emerges (apparent both in specific heat and susceptibility) and we identify an effective interaction $J_{eff}(x)$, valid across the entire doping range. This is distinct from Anderson's formula, as we choose here $t<0$, hence the opposite sign of the usual Nagaoka-ferromagnetic situation. This expression includes the subtle effect of weak kinetic AFM - as encountered in the infinitely correlated situation ($U=\infty$). By explicit computation of the Kubo-formulae, we address the question of practical relevance of the high-frequency expression for the Hall coefficient $R_H^*$. We hope to clarify some open questions concerning the applicability of the t-J model to real experimental situations through this study

Characterization of wheat (Triticum aestivum L.) genotypes unraveled by molecular markers considering heat stress

204-213The current study focuses and emphasis on the potential of heat stress to negatively affect crop physiology. Here, we have screened 19 wheat (Triticum aestivum L.) genotypes for their tolerance of heat stress. Significant differences were observed among the genotypes for all the traits under consideration. Exploitable extent of genetic variability amongst the entries was present as revealed by considerably higher estimates of mean percentage. On the basis of heat susceptibility index genotypes, Halna, Mon’s Ald’s, Cuo/79/Prulla and K 307 were identified as heat-tolerant whereas SAWSN 3041, SAWSN 3101 and K 0583 were identified as heat-susceptible. Seventeen wheat microsatellite markers were capable of detecting 89 alleles with an average of 4.6 alleles per locus. Polymorphism information content (PIC) value ranged from 0.16 for the primer XGWM 516 to 0.83 for DUPW 117 with an average of 0.60. A perusal of similarity coefficients clearly reflected that a very high degree of similarity exists between wheat variety Mon’s Ald’s and SAWSN 3101 (0.70). On the other hand, the two most distantly related cultivars were found to be AKAW 4008 and PBW 343 (0.034). Marker BARC 4, BARC 170, BARC 311, PSP 3058, WHE014. H04 and GWM 458 were strongly associated with the heat tolerance for traits TGW and BARC 311 were strongly associated with terminal heat tolerance for number of grains/plant, respectively. Considering all the parameters it is adjudged that relatively stable genotypes may be evaluated at various agro-climatic regions for grain yield and heat tolerance along with other contributing characters and ideal plant type

Local tetragonal distortion in La_{0.7}Sr_{0.3}MnO_3 strained thin films probed by x-ray absorption spectroscopy

We report on an angular resolved X-ray Absorption Spectroscopy study of $La_{0.7}Sr_{0.3}MnO_{3}$ thin films epitaxially grown by pulsed laser deposition on slightly mismatched substrates which induce tensile or compressive strains. XANES spectra give evidence of tetragonal distortion within the $MnO_{6}$ octahedra, with opposite directions for tensile and compressive strains. Quantitative analysis has been done and a model of tetragonal distortion reflecting the strain has been established. EXAFS data collected in plane for tensile substrate confirm the change in the $Mn-O$ average bond distance and the increase of $Mn-Mn$ length matching with the enlargement of the cell parameter. From these results we conclude that there is no significant change in the $Mn-O-Mn$ angle. Our observations conflict with the scenarios which this angle is the main driving parameter in the sensitivity of manganite films properties to external strains and suggest that the distortion within the octahedra plays a key role in the modification of the transport and magnetic properties.Comment: 8 pages, 6 figure

Multi-dimensional parametric assessment with IoT in acquaintance of digital pipeline

In IoT researches are found millions of devices are connected in global digital infrastructure framed in network fashion. Most of the things on the network use cloud or central database to share their data and control signals to control and manage the devices on the IoT network. Devices on the network need fast traversing paths, to take correct decision in right time. The data synchronization between source and destination is very important in real time parameter maintenance. The multidimensional parametric evaluation of the environment or the surrounding area is facing problems with data synchronization and congestion in the sensor network. This will lead arrival of fault data at the destination. The fault data also leads a misconception at user end. In the present work pipeline integration is proposed to overcome the misconception and synchronization failures. The pipeline and Arduino UNO processor are integrated on Proteus simulation tool. Transducer nodes and the functionalities are analysed with pipeline

Automated Home Appliances Control using Embedded Web Server

In modern construction in industrialized nations, most homes have been wired for TV, lights and fans etc...  Many household tasks were automated by the development of specialized automated appliances. In this project we are going to create the embedded web server so that we can control the electrical devices through online by using either computer or by using smart phone. The purpose of this project is to design a control system that able to control a system device remotely from distance and monitoring condition of the system in real-time as well. This project shows how to set up an Arduino with Ethernet shield as a web server. The web servers in this Project are used to serve up web pages that can be accessed from a web browser and allows our hardware to be controlled from web browser. Starting from basic, our example for this project is simple. We want to access our device by switching ON-OFF LED and monitor analog input data acquisition from web server, which are the computer and Arduino connected to the same network

DUAL-RAIL GATE STRUCTURE FOR A COMPLEX DATA PATH

Dual-rail domino gates are restricted to create a reliable critical data path. According to this critical data path, the handshake circuits are greatly simplified, that provides the pipeline high throughput in addition to low power consumption. This paper presents a higher-throughput and ultralow-power asynchronous domino logic pipeline design method, targeting to latch-free and very fine-grain or gate-level design. The information pathways are comprised of a combination of dual-rail and single-rail domino gates. The 4 phase bundled-data protocol design most carefully resembles the style of synchronous circuits. Furthermore, the stable critical data path enables the adoption of single-rail domino gates within the noncritical data pathways. An 8 × 8 array style multiplier can be used for evaluating the suggested pipeline method. This saves lots of power by reduction of the overhead of logic circuits. In contrast to a bundled-data asynchronous domino logic pipeline, the suggested pipeline saves energy within the best situation and also the worst situation when processing different data patterns

A CLATTER LIBERAL FRAMEWORK TO CONSTRUCT REPLICA BLOCK

We design the fixed-width RPR with error compensation circuit via analyzing of probability and statistics. While using partial product relation to input correction vector and minor input correction vector to reduce the truncation errors, the hardware complexity of error compensation circuit could be simplified. Within this paper, we advise a dependable low-power multiplier design by adopting algorithmic noise tolerant (ANT) architecture using the fixed-width multiplier to construct the lower precision replica redundancy block (RPR). The reduced-current low-power merit within the presented ANT design can nonetheless be preserved under process deviation and-temperature environments. Under lower Kvos, the ability consumption could be decreased. The suggested ANT architecture can satisfy the need for high precision, low power consumption, and area efficiency. Within an ANT multiplier, circuit area within our fixed-width RPR could be decreased and power consumption within our ANT design could be saved compared to the condition-of-art ANT design. The RPR area is yet another main factor which will modify the power saving. The truncated RPRs are examined from word period of 5 to 10 bits using Synopsys design complier CAD tool. Hence, we compare the circuitry area occupied through the fixed-width RPR multiplier and also the full-width RPR multiplier

Distribution and enrichment of 210Po in the environment of Kaiga in South India

Several soil and vegetation samples from the environment of Kaiga nuclear power plant site in the south western region of India were analysed for 210Po. The vertical profile, particle-size distribution, seasonal variation and the dry deposition rate of 210Po were measured employing the chemical method and α - counting technique. 210Po activity in soil varies from 17.1 to 228.2 Bq kg-1 with a mean value of 83.3 Bq kg-1. The activity of 210Po is higher in the surface soil (0-5 cm) and decreases as depth increases to 20 cm and remains nearly constant thereafter. The activity concentration is almost uniform in the grain sizes of 350-177 μm and below 177 μm. Pterobryopsis tumida (Hook.) Dix, a plant of the moss family, shows a very high level of 210Po activity - 2724 ± 13 Bq kg-1. Seasonal variation studies show elevated levels of 210Po in vegetation during winter. The annual dry deposition rate of 210Po was 53.4 Bq m-2 yr-1. (C) 2000 Elsevier Science Ltd