La substitution induced linear temperature dependence of electrical resistivity and Kondo behavior in the alloys, Ce_{2-x}La_{x}CoSi_{3}

The results of electrical resistivity, heat capacity and magnetic susceptibility behavior of new class of alloys, Ce_{2-x}La_{x}CoSi_{3}, are reported. The x= 0.0 alloy is mixed valent and La substitution for Ce (x= 0.25) induces linear temperature dependence of resistivity at low temperatures, an observation of relevance to the topic of non-Fermi liquid behavior. The modifications of Kondo effect for all the alloys are also presented.Comment: Accepted for publication in Solid State Communication

Magnetic and electrical resistance behaviour of the oxides, Ca<SUB>3−x</SUB>Y<SUB>x</SUB>LiRuO<SUB>6</SUB> (x=0.0, 0.5 and 1.0)

We have investigated the magnetic and electrical resistance behaviour of Ca3&#8722;xYxLiRuO6. The parent compound exhibits magnetic ordering of the ruthenium sublattice at a rather high temperature, 113 K. Though the paramagnetic Curie temperature (&#952;p) is negative and indicates antiferromagnetic ordering, the large magnitude (&#8722;250 K) of &#952;p reveals a complex nature of the magnetism in this compound. Ru ions appear to be in the pentavalent state. We note that the N&#233;el temperature undergoes only a marginal reduction by Y substitution. All these compositions are found to be insulators and thus the electron doping does not result in metallicity. Thus the overall magnetic and transport behaviour are found to be essentially insensitive to Y substitution for Ca, a finding which may favour the idea of quasi-one-dimensional magnetism in these compounds

Magnetic and electrical resistance behaviour of the oxides, Ca3−x_{3-x}Yx_xLiRuO6_6 (x= 0.0, 0.5 and 1.0)

We have investigated the magnetic and electrical resistance behaviour of Ca$_{3-x}$Y$_x$LiRuO$_6$. The parent compound exhibits magnetic ordering from Ru sublattice at a rather high temperature, 113 K. Though the paramagnetic Curie temperature ($\theta$$_p$) is negative indicative of antiferromagnetic ordering, the large magnitude (-250 K) of $\theta$$_p$ reveals complex nature of the magnetism in this compound. Ru ions appear to be in the pentavalent state. We note that the N\'eel temperature undergoes only a marginal reduction by Y substitution. All these compositions are found to be insulators and thus the electron doping does not result in metallicity. Thus the overall magnetic and transport behaviour are found to be essentially insensitive to Y substitution for Ca, a finding which may favour the idea of quasi-one-dimensional magnetism in these compounds.Comment: 5 pages of text in RevTex, 6 figures, Solid State Communications (in press

Unusual Behavior in Children-Foreign Object in Tooth: A Report of Two Cases

Background: The chance of discovering foreign object in a root canal is more commonly seen in children. Foreign objects may act as a potential source of infection, which may hinder the complete debridement of root canal. Although the main etiology being an accidental insertion, there are other possibilities such as self-injurious habits which should be ruled out.Case Details: The present article describes two case of foreign object in root canal, their possible etiology and management modalities. The first case reports a usual case of staple pin in root canal of primary teeth. The second case was a broken pin inside anterior permanent teeth. The cases reported highlight the need for proper diagnosis and early management.Conclusion: This case report highlights the need for proper understanding of the etiology in management of foreign body in root canal system.Keywords: Foreign object, Self-Embedding habit, Stapler pi

Magnetization and magnetoresistance in insulating phases of SrFeO3-d

We report the synthesis and properties of two new insulating phases of SrFeO3-d with introduction of oxygen deficiencies in metallic SrFeO3 ; one with 0.15 < d < 0.19 (sample A)and the other above d = 0.19 (sample B). Sample A shows large negative magnetoresistance around the charged ordering (CO) temperature with magnetic anomalies seen in the temperature dependent resistivity,magnetization and M-H hysteresis loops. Sample B shows a smooth insulating behavior with no thermal hysteresis in the resistivity and with a small positive magnetoresistance. cac and cdc show multiple features associated with a frustrated magnetic order (helical) due to competing ferro- and antiferromagnetic interactions. The competing effects of ferro- and antiferromagnetic phases extend up to T ~ 230 K revealing a new high temperature scale in this system. These observations are discussed in the context of magnetic interactions associated with the varying Fe4+/Fe3+ ratio.Comment: 11 pages, 4 figure

Proffering Ranks to the Smart Cities based on the Data Received from IoT Devices using Visualization Techniques

Innovative lifestyle in cities upgraded the smart infrastructure and sustainable significance in the countries worldwide. A new approach is proposed to analyze the smart-city indexing across the world based on the key features to proffer the city ranking. The key features like smart-mobility refers to the Intelligent movement of citizens, smart environment refers to improvement in the efficiency of inhabitance within the city, smart governance used in applying innovative technological implementation to provide service, smart economy refers to the improvement in various urban aspects and livelihood. Proposed approach focuses on classifying the smart innovative infrastructural implementation in the urban livelihood for city data visualization and proffering cluster ranks by validating the proffering with Convolutional-Neural Network (CNN). To collect the data, we used IoT sensors information by integrating the sensors of six feature metrics in city-hubs. The huge data collected from the sensors are utilized to perform the smart-city visualization. Data are analyzed using statistical procedure by grouping the similar data to applying folium cluster techniques and fuzzy mapping. A detailed description and analysis of smart indexing are grounded by proffering effectively, in addition the subsequent research analysis is recommended for the researchers

Metal Doping in Topological Insulators- A Key for Tunable Generation of Terahertz

The unique surface edge states make topological insulators a primary focus among different applications. In this article, we synthesized a large single crystal of Niobium(Nb)-doped Bi2Se3 topological insulator (TI) with a formula Nb0.25Bi2Se3. The single crystal has characterized by using various techniques such as Powder X-ray Diffractometer (PXRD), DC magnetization measurements, Raman, and Ultrafast transient absorption spectroscopy (TRUS). There are (00l) reflections in the PXRD, and Superconductivity ingrown crystal is evident from clearly visible diamagnetic transition at 2.5K in both FC and ZFC measurements. The Raman spectroscopy is used to find the different vibrational modes in the sample. Further, the sample is excited by a pump of 1.90 eV, and a kinetic decay profile at 1.38 eV is considered for terahertz analysis. The differential decay profile has different vibrations, and these oscillations have analyzed in terms of terahertz. This article not only provides evidence of terahertz generation in Nb-doped sample along with undoped sample but also show that the dopant atom changes the dynamics of charge carriers and thereby the shift in the Terahertz frequency response. In conclusion, a suitable dopant can be used as a processor for the tunability of terahertz frequency in TI.Comment: 16 Pages Text + Figs: Comments/suggestions welcom

Anticoagulant property of sulphated polysaccharides extracted from marine brown algae collected from Mandapam Island, India

The marine brown algae: Sargassum tenerrimum, Sargassum wightii, Turbinaria conoides, Turbinaria ornata and Padina tetrastromatica were collected from Mandapam Island, India. The crude sulphated polysaccharides (SPS) were extracted using hot water and examined for anticoagulation activity. The sugar, sulphate and protein in crude SPS were analyzed. The presence of sulphated polysaccharide was confirmed by agarose gel electrophoresis and further characterized by Fourier transform infrared spectroscopy (FTIR). The FTIR analysis of crude SPS showed characteristic band of polysaccharides at 900, 1740 cm-1 and ester sulphate at 1250 to 1260 cm-1. Moreover, the absorbance band at 820 cm-1 for S. tenerrimum, S. wightii, T. conoides and T. ornata denotes sulphation at equatorial position, but in the case of P. tetrastromatica, sulphation at axial position is denoted by absorbance band at 850 cm-1. The heparin like activity of crude SPS was determined by metachromatic assay. The anticoagulant activity of crude SPS was evaluated by activated partial thromboplastin time (APTT) and prothrombin time (PT) assays. The metachromatic, APTT and heparinoid activities of crude SPS from S. tenerrimum, S. wightii, T. conoides, T. ornata and P. tetrastromatica were in the range of 0.045 to 0.0347, 134 to 89 s and 25.47 to 14.5 USP units/mg, respectively. The prolongation of prothrombin time by crude SPS was not found.Keywords: Brown algae, sulphated polysaccharides, Fourier transform infrared spectrometer (FTIR), agarose gel, metachromatic activity, activated partial thromboplastin time (APTT), heparinAfrican Journal of Biotechnology Vol. 12(16), pp. 1937-194