1,545 research outputs found
Direct synthesis iron oxide nanoparticles using ramie, lemon and dragon fruit as green and low cost approach
Plant extracts have been used as agent reduction capping to synthesise various nanoparticlesdue to the process is a low cost, large-scale method and environmental friendly. Herein, ironoxide nanoparticles were synthesized using ramie, lemon and dragon fruit extracts. Thecharacterization results show that all synthesized iron oxide nanoparticles had almost similardiameters, shape and crystalline phases although different of plants extracts were used.Among the plants, ramie has cheapest market price in which the cost production of iron oxidenanoparticles can be reduced significantly.Keywords: iron oxide nanoparticles; scanning electron microscop
Comparison of Volatile Compounds in Two Brandies Using HS-SPME Coupled with GC-O, GC-MS and Sensory Evaluation
The aim of this study was to compare the volatile compounds between Changyu XO and Hennessy XO. Sensoryevaluation was performed by a panel of tasters. Qualitative and semi-quantitative analysis was achieved byheadspace solid phase micro-extraction (HS-SPME), coupled with gas chromatography-mass spectrometry (GCMS)and gas chromatography-olfactometry (GC-O). A total of 160 volatile compounds were identified in the twobrands of brandy. Of these, 118 compounds were common to both Changyu XO and Hennessy XO; 18 compoundswere specific to Changyu XO and 24 were specific to Hennessy XO. A total of 85 aroma compounds responsiblefor brandy flavour were identified by GC-O, of which 68 were common to both brands, while seven and tenwere specific to Changyu XO and Hennessy XO, respectively. The study provided detailed information aboutthe compounds responsible for the characteristic flavour of specific brandies. According to statistical analysis,significant differences were recorded between Changyu XO and Hennessy XO. Most volatile compounds inChangyu XO occurred at lower concentrations than those in Hennessy XO. Based on sensory evaluation analysis,the floral, alcohol and rancid aroma descriptors achieved higher scores in Changyu XO and Hennessy XO, whilethe lime aroma seemed specific to Hennessy XO. Herb and almond aromas were specific to Changyu XO
Understanding the newly observed Y(4008) by Belle
Very recently a new enhancement around 4.05 GeV was observed by Belle
experiment. In this short note, we discuss some possible assignments for this
enhancement, i.e. and molecular state. In these two
assignments, Y(4008) can decay into with comparable
branching ratio with that of . Thus one suggests
high energy experimentalists to look for Y(4008) in channel.
Furthermore one proposes further experiments to search missing channel
, and especially and
, which will be helpful to distinguish and
molecular state assignments for this new enhancement.Comment: 4 pages, 5 figures. Typos correcte
Tortoise coordinate and Hawking effect in a dynamical Kerr black hole
Hawking effect from a dynamical Kerr black hole is investigated using the
improved Damour-Ruffini method with a new tortoise coordinate transformation.
Hawking temperature of the black hole can be obtained point by point at the
event horizon. It is found that Hawking temperatures of different points on the
surface are different. Moreover, the temperature does not turn to zero while
the dynamical black hole turns to an extreme one.Comment: 7 page
Hadronic Parity Violation and Inelastic Electron-Deuteron Scattering
We compute contributions to the parity-violating (PV) inelastic
electron-deuteron scattering asymmetry arising from hadronic PV. While hadronic
PV effects can be relatively important in PV threshold electro- disintegration,
we find that they are highly suppressed at quasielastic kinematics. The
interpretation of the PV quasielastic asymmetry is, thus, largely unaffected by
hadronic PV.Comment: 27 pages, 13 figures, uses REVTeX and BibTe
Tunnelling through black rings
Hawking radiation of black ring solutions to 5-dimensional
Einstein-Maxwell-dilaton gravity theory is analyzed by use of the
Parikh-Wilczek tunnelling method. To get the correct tunnelling amplitude and
emission rate, we adopted and developed the Angheben-Nadalini-Vanzo-Zerbini
covariant approach to cover the effects of rotation and electronic discharge
all at once, and the effect of back reaction is also taken into account. This
constitute a unified approach to the tunnelling problem. Provided the first law
of thermodynamics for black rings holds, the emission rate is proportional to
the exponential of the change of Bekenstein-Hawking entropy. Explicit
calculation for black ring temperatures agree exactly with the results obtained
via the classical surface gravity method and the quasilocal formalism.Comment: 10 pages, V2: various modifications throughout the text, plus a lot
of newly added reference
Hepatitis B virus subgenotype C2 is the most prevalent subgenotype in northeast China
AbstractThe geographical distribution of hepatitis B virus (HBV) subgenotypes and their clinical implications in patients with acute and chronic hepatitis B in the Heilung-kiang province of northeast China were investigated. Nested PCR and multiplex PCR were performed with genotype-specific primers and with subgenotype-specific primers to identify genotypes and subgenotypes from serum samples of 412 HBV infections including 69 with acute self-limited hepatitis (ASH) and 343 with chronic hepatitis (CH). A total of 361 samples were genotyped and 304 were further subgenotyped. The most common HBV genotype was C (93.63%, 338/361), with subgenotype group C2 (83.73%, 283/338) predominating. Genotype B was also found and subgenotype B2 predominated within this genotype. Out of 69 infected patients with ASH, 48 were identified as genotype C and all belonged to subgenotype C2. Of 343 infected patients with CH, 313 were genotyped and 256 were subgenotyped; amongst these, C2 (91.80%, 235/256), B2 (7.42%, 19/256) and mixed subgenotypes B2 and C2 (0.78%, 2/256) were found. In HBV subgenotype C2 infections, ASH had a higher ratio of women than CH patients. These results show that HBV subgenotypes C2 and B2 were found in Heilung-kiang province of northeast China. In ASH and CH groups, the distributions of subgenotypes were coincident with C2, the predominant subgenotype. Analysis of the association between subgenotype and the outcomes of HBV infection was inconclusive in our study
Creep Lifetime Assessment of Pressure-Tight PE100 Pipes Based on a Slow Fatigue Crack Growth
Polyethylene pipes are widely used in water supply, gas, and sewage systems due to their excellent mechanical properties. A slow crack growth is the primary fracture mechanism for the pipes under long-term internal pressures. If the creep loading is treated as a special case of fatigue loading, the slow crack growth kinetics of polyethylene is defined in fatigue fracture tests at different stress ratios and extrapolated to creep crack kinetics. Linear elastic fracture mechanics concepts became the basis for predicting the creep lifetime of pressure-tight pipes subjected to various hoop stresses from extrapolated (synthetic) creep crack growth curves, and the prediction is in good agreement with the standard extrapolation, in accordance with ISO 9080.ΠΠΎΠ»ΠΈΡΡΠΈΠ»Π΅Π½ΠΎΠ²ΡΠ΅ ΡΡΡΠ±Ρ ΡΠΈΡΠΎΠΊΠΎ ΠΏΡΠΈΠΌΠ΅Π½ΡΡΡΡΡ Π² Π²ΠΎΠ΄ΠΎΡΠ½Π°Π±ΠΆΠ΅Π½ΠΈΠΈ, ΡΠΈΡΡΠ΅ΠΌΠ°Ρ
Π³Π°Π·ΠΎΡΠ½Π°Π±ΠΆΠ΅Π½ΠΈΡ ΠΈ ΠΊΠ°Π½Π°Π»ΠΈΠ·Π°ΡΠΈΠΈ Π±Π»Π°Π³ΠΎΠ΄Π°ΡΡ ΠΈΡ
Π²ΡΡΠΎΠΊΠΈΠΌ ΠΌΠ΅Ρ
Π°Π½ΠΈΡΠ΅ΡΠΊΠΈΠΌ ΡΠ²ΠΎΠΉΡΡΠ²Π°ΠΌ. ΠΠ΅Π΄Π»Π΅Π½Π½ΡΠΉ ΡΠΎΡΡ ΡΡΠ΅ΡΠΈΠ½ ΡΠ²Π»ΡΠ΅ΡΡΡ ΠΎΡΠ½ΠΎΠ²Π½ΡΠΌ ΠΌΠ΅Ρ
Π°Π½ΠΈΠ·ΠΌΠΎΠΌ ΡΠ°Π·ΡΡΡΠ΅Π½ΠΈΡ ΠΏΠΎΠ»ΠΈΡΡΠΈΠ»Π΅Π½ΠΎΠ²ΡΡ
ΡΡΡΠ± ΠΏΠΎΠ΄ Π΄Π»ΠΈΡΠ΅Π»ΡΠ½ΡΠΌ Π²Π½ΡΡΡΠ΅Π½Π½ΠΈΠΌ Π΄Π°Π²Π»Π΅Π½ΠΈΠ΅ΠΌ. Π Π°ΡΡΠΌΠ°ΡΡΠΈΠ²Π°Ρ Π½Π°Π³ΡΡΠΆΠ΅Π½ΠΈΠ΅ ΠΏΡΠΈ ΠΏΠΎΠ»Π·ΡΡΠ΅ΡΡΠΈ ΠΊΠ°ΠΊ ΠΎΡΠΎΠ±ΡΠΉ ΡΠ»ΡΡΠ°ΠΉ ΡΡΡΠ°Π»ΠΎΡΡΠ½ΠΎΠ³ΠΎ Π½Π°Π³ΡΡΠΆΠ΅Π½ΠΈΡ, ΠΊΠΈΠ½Π΅ΡΠΈΠΊΠ° ΠΌΠ΅Π΄Π»Π΅Π½Π½ΠΎΠ³ΠΎ ΡΠΎΡΡΠ° ΡΡΠ΅ΡΠΈΠ½ Π² ΠΏΠΎΠ»ΠΈΡΡΠΈΠ»Π΅Π½ΠΎΠ²ΠΎΠΌ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»Π΅ ΠΎΠΏΡΠ΅Π΄Π΅Π»ΡΠ΅ΡΡΡ ΠΏΡΡΠ΅ΠΌ ΠΈΡΠΏΡΡΠ°Π½ΠΈΠΉ Π½Π° ΡΡΡΠ°Π»ΠΎΡΡΠ½ΠΎΠ΅ ΡΠ°Π·ΡΡΡΠ΅Π½ΠΈΠ΅ ΠΏΡΠΈ ΡΠ°Π·Π»ΠΈΡΠ½ΡΡ
ΠΊΠΎΡΡΡΠΈΡΠΈΠ΅Π½ΡΠ°Ρ
Π°ΡΠΈΠΌΠΌΠ΅ΡΡΠΈΠΈ ΡΠΈΠΊΠ»Π° Π½Π°ΠΏΡΡΠΆΠ΅Π½ΠΈΠΉ ΠΈ ΡΠΊΡΡΡΠ°ΠΏΠΎΠ»ΠΈΡΡΠ΅ΡΡΡ Π½Π° ΠΊΠΈΠ½Π΅ΡΠΈΠΊΡ ΡΡΠ΅ΡΠΈΠ½ ΠΏΠΎΠ»Π·ΡΡΠ΅ΡΡΠΈ. ΠΡΡ
ΠΎΠ΄Ρ ΠΈΠ· ΡΠ΅ΠΎΡΠΈΠΈ Π»ΠΈΠ½Π΅ΠΉΠ½ΠΎΡΠΏΡΡΠ³ΠΎΠΉ ΠΌΠ΅Ρ
Π°Π½ΠΈΠΊΠΈ ΡΠ°Π·ΡΡΡΠ΅Π½ΠΈΡ Π΄ΠΎΠ»Π³ΠΎΠ²Π΅ΡΠ½ΠΎΡΡΡ ΠΏΡΠΈ ΠΏΠΎΠ»Π·ΡΡΠ΅ΡΡΠΈ ΠΏΠΎΠ»ΠΈΡΡΠΈΠ»Π΅Π½ΠΎΠ²ΠΎΠΉ ΡΡΡΠ±Ρ ΠΏΠΎΠ΄ Π΄Π°Π²Π»Π΅Π½ΠΈΠ΅ΠΌ, ΠΏΠΎΠ΄Π²Π΅ΡΠΆΠ΅Π½Π½ΠΎΠΉ Π΄Π΅ΠΉΡΡΠ²ΠΈΡ ΡΠ°Π·Π»ΠΈΡΠ½ΡΡ
ΠΎΠΊΡΡΠΆΠ½ΡΡ
Π½Π°ΠΏΡΡΠΆΠ΅Π½ΠΈΠΉ, ΠΏΡΠΎΠ³Π½ΠΎΠ·ΠΈΡΡΠ΅ΡΡΡ Π½Π° ΠΎΡΠ½ΠΎΠ²Π΅ ΡΠΈΠ½ΡΠ΅ΡΠΈΡΠ΅ΡΠΊΠΎΠΉ ΠΊΡΠΈΠ²ΠΎΠΉ ΡΠΎΡΡΠ° ΡΡΠ΅ΡΠΈΠ½ ΠΏΠΎΠ»Π·ΡΡΠ΅ΡΡΠΈ, ΠΈ ΠΏΡΠΎΠ³Π½ΠΎΠ·Ρ Ρ
ΠΎΡΠΎΡΠΎ ΡΠΎΠ³Π»Π°ΡΡΡΡΡΡ ΡΠΎ ΡΡΠ°Π½Π΄Π°ΡΡΠ½ΠΎΠΉ ΡΠΊΡΡΡΠΎΠΏΠΎΠ»ΡΡΠΈΠ΅ΠΉ Π² ΡΠΎΠΎΡΠ²Π΅ΡΡΡΠ²ΠΈΠΈ Ρ ISO 9080
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