SIMULATING MULTI-COMPONENT PARTICLES BEHAVIOUR DURING THE CLASSIFICATION PROCESS IN A HYDROCYCLONE USING MULTIPHASE CFD MODEL

Numerical simulation of the hydrocyclone is known for its complexity and non-trivial solving strategies. The flow inside the hydrocyclone is highly turbulent and intricate in nature. Most of the mathematical model reflects the single average mineral density for the hydrocyclone multiphase classification performance. The behaviour of multicomponent particles in a hydrocyclone is superficially understood and the component interactions are unaccounted for most of the available mathematical models .In this work, multi size and density simulation of hydrocyclone are carried out using CFD approach. The turbulence is solved using the large eddy simulation (LES) model. The multiphase is modelled using the volume of fluid (VOF) and algebraic slip mixture (ASM) model. The multi-phase numerical simulation contains 10 phases at an instant i.e. water, air, 4 phases of magnetite and silica each, having different sizes and volume fractions. The mixture of magnetite and silica ratios i.e. 1:9, 2:8, 1:1 is considered for the understanding of interaction between components and sizes in complex flow system at optimized hydrocyclone conditions. The CFD model is able to predict the salient features of the cyclone flow fields in great detail, thus providing a better understanding of the solid recovery to the underflow, where authors have observed high Rs for the heavier particle i.e. magnetite. Separation characteristics of the silica and magnetite particles are explained using locus of zero vertical velocities (LZVV) and equilibrium radius

Characteristic and trends of malaria in Surat district of Gujarat: a hospital based study

Background: Malaria is a major health problem and infects many individuals despite of various efforts to control it. The present study was aimed to observe characteristics of malaria, seasonal variation and prevalence of malaria in our region.Methods: This retrospective study was conducted in our institute from period of January 2012 to December 2012.  All the fever cases undergone investigations for malarial parasites were included in present study for defined time period.  All the laboratory data of the patients having fever were retrieved from the Pathology Laboratory of our institute.Results: out of total 32674 reports studied 4907(15.01%) were positive for malaria with overall Slide positivity rate and slide falciparum rate were 15.01% and 38.29% respectively. Incidence of malaria occurs throughout year with increased incidence of P. falciparum in monsoon.Conclusion: In the present study incidence of malaria was higher in monsoon in comparison to other seasons. But throughout the year no declining trends in incidence of malaria was observed. P. vivax malaria was more commonly observed in our study but incidence of P. falciparum increased in monsoon

A facile threecomponent solid phase synthesis of steroidal Aring fused pyrimidines under microwave irradiation

The preparation of ringA fused pyrimidines at the steroidal 2,3position is herein described. The novel steroidal pyrimidines were prepared from the solid phase threecomponent reaction of 2hydroxymethylene3keto steroids, arylaldehydes and ammonium acetate under microwave irradiatio

A facile three-component solid phase synthesis of steroidal A-ring fused pyrimidines under microwave irradiation

The preparation of ring-A fused pyrimidines at the steroidal 2,3-position is herein described. The novel steroidal pyrimidines were prepared from the solid phase three-component reaction of 2- hydroxymethylene-3-keto steroids, arylaldehydes and ammonium acetate under microwave irradiation

Study of metastasis in lymph node by fine needle aspiration cytology: our institutional experience

Background:Fine needle aspiration cytology (FNAC) is a reliable as well as an inexpensive diagnostic method. It is suitable for the developing countries for the diagnosis of lymphadenopathy at any approachable site. Fine needle aspiration cytology not only confirms the presence of metastatic disease but also, in most cases, gives the clue regarding the origin of the primary tumor, prognosis as well in the management of patient for staging purposes. The aim of the study was to detect and diagnose metastasis in lymph nodes. Methods:A study was done of all metastatic lymph node lesions reported in Department of Pathology, Govt. Medical College, Surat from May 2011 to April 2012.Results:A total of 2355 cases of fine needle aspiration cytology were carried out of which 580 cases were of lymph node. Cytology results were positive for metastasis in 157 specimens (27.06%). The most common site was cervical lymph nodes. Maximum numbers of cases of metastatic tumors were in 41-50 yrs age group. There were 115 males and 42 females with a male predominance (Male:Female= 2.8:1). The most common malignancy was squamous cells carcinoma, seen in 118 cases (75.15%), followed by metastatic mammary carcinoma (13 cases, 8.29%). In 26 cases out of 580 cases, histopathological confirmation was done and diagnostic accuracy of FNAC was 100%. Conclusions:Fine needle aspiration cytology of lymphadenopathy is a useful tool in diagnosing metastatic lesions with good certainty

Design, Performance, and Calibration of CMS Hadron-Barrel Calorimeter Wedges

Extensive measurements have been made with pions, electrons and muons on four production wedges of the Compact Muon Solenoid (CMS) hadron barrel (HB) calorimeter in the H2 beam line at CERN with particle momenta varying from 20 to 300 GeV/c. Data were taken both with and without a prototype electromagnetic lead tungstate crystal calorimeter (EB) in front of the hadron calorimeter. The time structure of the events was measured with the full chain of preproduction front-end electronics running at 34 MHz. Moving-wire radioactive source data were also collected for all scintillator layers in the HB. These measurements set the absolute calibration of the HB prior to first pp collisions to approximately 4%

Synchronization and Timing in CMS HCAL

The synchronization and timing of the hadron calorimeter (HCAL) for the Compact Muon Solenoid has been extensively studied with test beams at CERN during the period 2003-4, including runs with 40 MHz structured beam. The relative phases of the signals from different calorimeter segments are timed to 1 ns accuracy using a laser and equalized using programmable delay settings in the front-end electronics. The beam was used to verify the timing and to map out the entire range of pulse shapes over the 25 ns interval between beam crossings. These data were used to make detailed measurements of energy-dependent time slewing effects and to tune the electronics for optimal performance

Energy Response and Longitudinal Shower Profiles Measured in CMS HCAL and Comparison With Geant4

The response of the CMS combined electromagnetic and hadron calorimeter to beams of pions with momenta in the range 5-300 GeV/c has been measured in the H2 test beam at CERN. The raw response with the electromagnetic compartment calibrated to electrons and the hadron compartment calibrated to 300 GeV pions may be represented by sigma = (1.2) sqrt{E} oplus (0.095) E. The fraction of energy visible in the calorimeter ranges from 0.72 at 5 GeV to 0.95 at 300 GeV, indicating a substantial nonlinearity. The intrinsic electron to hadron ratios are fit as a function of energy and found to be in the range 1.3-2.7 for the electromagnetic compartment and 1.4-1.8 for the hadronic compartment. The fits are used to correct the non-linearity of the e pi response to 5% over the entire measured range resulting in a substantially improved resolution at low energy. Longitudinal shower profile have been measured in detail and compared to Geant4 models, LHEP-3.7 and QGSP-2.8. At energies below 30 GeV, the data, LHEP and QGSP are in agreement. Above 30 GeV, LHEP gives a more accurate simulation of the longitudinal shower profile

Design, Performance and Calibration of the CMS Forward Calorimeter Wedges

We report on the test beam results and calibration methods using charged particles of the CMS Forward Calorimeter (HF). The HF calorimeter covers a large pseudorapidity region (3\l |\eta| \le 5), and is essential for large number of physics channels with missing transverse energy. It is also expected to play a prominent role in the measurement of forward tagging jets in weak boson fusion channels. The HF calorimeter is based on steel absorber with embedded fused-silica-core optical fibers where Cherenkov radiation forms the basis of signal generation. Thus, the detector is essentially sensitive only to the electromagnetic shower core and is highly non-compensating (e/h \approx 5). This feature is also manifest in narrow and relatively short showers compared to similar calorimeters based on ionization. The choice of fused-silica optical fibers as active material is dictated by its exceptional radiation hardness. The electromagnetic energy resolution is dominated by photoelectron statistics and can be expressed in the customary form as a/\sqrt{E} + b. The stochastic term a is 198% and the constant term b is 9%. The hadronic energy resolution is largely determined by the fluctuations in the neutral pion production in showers, and when it is expressed as in the electromagnetic case, a = 280% and b = 11%

Design, Performance, and Calibration of CMS Hadron Endcap Calorimeters

Detailed measurements have been made with the CMS hadron calorimeter endcaps (HE) in response to beams of muons, electrons, and pions. Readout of HE with custom electronics and hybrid photodiodes (HPDs) shows no change of performance compared to readout with commercial electronics and photomultipliers. When combined with lead-tungstenate crystals, an energy resolution of 8\% is achieved with 300 GeV/c pions. A laser calibration system is used to set the timing and monitor operation of the complete electronics chain. Data taken with radioactive sources in comparison with test beam pions provides an absolute initial calibration of HE to approximately 4\% to 5\%