Improving the Performance of a Proxy Cache Using Very Fast Decision Tree Classifier

AbstractIn this paper, we improved the performance of Web proxy cache replacement policies such as LRU and GDSF by adapting a Very Fast Decision Tree learning technique. In the first part, a sliding window method integrated with Very Fast Decision tree classifier (VFDT) to classify the web log data and predict the classes of web objects to be revisited again in future or not. In the second part, a Very Fast Decision Tree classifier is incorporated with proxy caching policies to form novel approaches known as VFDT-LRU and VFDT-GDSF. This proposed approach improves the performances of LRU and GDSF in terms of hit and byte hit ratio respectively

Unidirectional growth, linear and nonlinear optical, dielectric and mechanical properties of organic adduct of L-tartaric acid nicotinamide

An attempt has been made to grow L-tartaric acid nicotinamide (LTN); a complex of tartaric acid, by employing a modified unidirectional method. The crystalline structure and quality are investigated by single crystal XRD and rocking curve studies. The linear and nonlinear optical properties are studied by UV–vis-NIR spectral analysis, SHG test, phase matching and laser induced damage threshold measure-ment. For comparison, parallel growth of the crystal was carried out by conventional method and the properties of the LTN samples grown by the conventional and unidirectional methods are investigated. The mechanical, photoconductivity and dielectric behavior of LTN crystals are also investigated

INDUCTION OF BROWN ADIPOSE TISSUE: A REVIEW

Objective: Obesity is the major problem which may lead to many other health ailments such as atherosclerosis, stroke, and depression. Both the cause as well as the treatment lies in the adipose tissue. The two main adipocytes, white adipose tissue (WAT) and brown adipose tissue (BAT) are responsible for the accumulation of fat and transformation of fat into heat, respectively. This review discusses the induction of BAT and browning of WAT by different pathways and activators to decrease the rate of obesity. Methods: Understanding the regulators, activators and secreted proteins which induce browning of WAT to BAT, as the BAT engage in thermogenesis process and transform fat into heat rather than storing it (WAT). Some of the core regulators are peroxisome proliferator-activated receptor-γ, PRDM16, PGC-1α. Results: A basic study explained about the origin of BAT and its functions, the function of hormones in BAT growth and its regulations. These studies provided the platform to understand about the mechanism of regulators, activators and secreted proteins which help in treating obesity and its related disorders by inducing the amount of BAT. Conclusion: The major health ailments caused by obesity can be reduced by increasing the activity of BAT and transforming WAT into BAT. A challenging way to treat these ailments is by regulating the activators and hormones responsible for the induction of BAT, so it transforms the excess fat into heat and avoiding the accumulation of fat. By understanding the role of regulators in the adipose tissue can provide various methods to reduce the chance of obesity and enhance efficient treatment in both children and adults

Vibrational spectra and analysis on the molecule of potassium pentaborate crystal (KB5)

161-166<span style="font-size: 16.0pt;mso-bidi-font-size:9.0pt;font-family:" times="" new="" roman","serif""="">Potassium pentaborate (KB5) crystals have been grown by solution growth technique. A structural investigation on the KBS crystal is made, using FTIR and laser Raman spectra. The molecular structure of KBS belongs to C2v symmetry considering the hydroxyl group as point mass. The total number of normal modes of vibration is 39 and are distributed as Γvib= 14A1<span style="font-size:12.5pt;mso-bidi-font-size:5.5pt; font-family:" arial","sans-serif""=""> <span style="font-size:16.0pt; mso-bidi-font-size:9.0pt;font-family:" arial","sans-serif""="">+ 5A2 <span style="font-size:16.0pt;mso-bidi-font-size:9.0pt;font-family: " arial","sans-serif""="">+ 10B1<span style="font-size:12.5pt; mso-bidi-font-size:5.5pt;font-family:" arial","sans-serif""=""> + 10B<span style="font-size:12.5pt;mso-bidi-font-size:5.5pt; font-family:" arial","sans-serif""="">2<span style="font-size:12.5pt; mso-bidi-font-size:5.5pt;font-family:" arial","sans-serif""="">. A normal coordinate analysis has been carried out with an orthonormal set of symmetry coordinates following Wilson F-G matrix method. The potential constants evaluated for this molecule are found to be in good agreement with literature, thereby, confirming the vibrational assignments. To check whether the chosen set of vibrational frequencies contributes maximum to the potential energy associated with the normal coordinates of the molecule, the potential energy distribution has been evaluated. Further, the thermogravimetric analysis (TGA) confirms the decomposition of KBS taking place in two stages. The differential scanning calorimetry (DSC) curve of KBS crystals has been recorded in the temperature range 50-580 °C. The phase transition temperature and enthalpies of KBS were measured and the results are discussed. </span

A novel two-phase thermal approach for synthesizing CdSe/CdS core/shell nanostructure

CdSe/CdS core/shell nanocrystals have been synthesized through a low cost and simple twophase thermal route. The optical spectroscopy and structural characterization evidenced the core/shell structure of the CdSe/CdS nanoparticles. The X-ray diffraction patterns of CdSe and CdSe/CdS nanoparticles exhibited peak positions corresponding to those of their bulk cubic crystal structures. The X-ray photoelectron spectroscopy data confirmed the elemental composition of the CdSe/CdS nanoparticles. The absorption spectra of core/shell nanoparticles showed red shift with respect to the core CdSe nanoparticles. The photoluminescence study indicates that the intensity of the emission maximum is considerably increased in the core/shell structure as compared with the parent material, and the capping of CdS nanoparticles with CdSe material exhibit a near band-edge emission, indicating a successful passivation by removing surface defects. The high-resolution transmission microscope images of the bare and core/shell nanoparticles ascertained the monodispersed and well-defined spherical particles. The average particle sizes for CdSe and CdSe/CdS nanoparticles are 2.5 and 5 nm, respectively, thus confirming, the larger diameter of CdSe/CdS core/shell nanostructure than the core CdSe nanoparticles

Unidirectional growth, structural, optical and mechanical properties of LTA crystal

Nonlinear optical amino acid single crystal of l-tartaric acid was successfully grown by unidirectional Sankaranarayanan–Ramasamy method under ambient conditions for the first time. The grown single crystal was subjected to different characterization analyses in order to find out its suitability for device fabrication. The crystal system and lattice parameters were determined from the powder X-ray diffraction analysis. The crystalline perfection was evaluated using high-resolution X-ray diffractometry. It is evident from the optical absorption study that crystal has excellent transmission in the entire visible region with its lower cut off wavelength around 220 nm. The mechanical properties of the grown crystals were studied using Vickers microhardness tester

Growth and characterization of a new non-linear optical tris lead tris barium borate (TLTBB) single crystal

The growth of a new inorganic non-linear optical (NLO) borate crystal, tris lead tris barium borate (TLTBB) material has been reported. Crystal of dimension up to 7 mm × 5 mm × 5 mm are obtained from its aqueous solution by slow solvent evaporation technique. The resulting crystal exhibits square shape morphology. The crystal structure and morphology of the grown crystal have been identified by single crystal X-ray diffraction analysis. The high-resolution X-ray diffraction (HRXRD) analysis of the sample indicates its moderate crystalline quality. The UV–vis–NIR spectrum of TLTBB reveals a wide optical trans- mission window with a low level of optical absorption in the entire visible region. The second harmonic generation (SHG) efficiency of the sample is found to be nearly three times that of the standard KDP and its laser damage threshold value is 1.32 GW cm−2 . The TGA/DTA analysis confirms high thermal stability (775.25 ◦ C) of the sample among the solution grown NLO borate crystals. The SEM micrograph of TLTBB indicates that the crystal is made up of rectangular blocks with step like patterns