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热带农业工程 2003年第4期28卷 32-36页

作者： chetana.chopda 喻孟君

(续第2期)结果与讨论澄清果汁和浓缩产品离心可以把原浆中大多数不可溶解的物质除去,但果汁中仍存有部分引起果汁混浊的胶质颗粒.

关键词：番石榴汁番石榴粉加工工艺澄清果汁浓缩产品

Erosive Wear Study of PPLSF/Glass Fiber Reinforced Hybrid Laminates

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Journal of Harbin Institute of Technology(New Series) 2024年第2期31卷 68-79页

作者： chetana Tripathy Deepak Kumar Mohapatra Chitta Ranjan Deo Punyapriya Mishra Department of Mechanical Engineering Veer Surendra Sai University of Technology(VSSUT)Sambalpur 768018India

This work is focused to examine the erosive performance of hybrid Palmyra palm leaf stalk fiber(PPLSF)/glass polyester laminate against solid particle bombardment.A hand lay-up method was adopted for the fabricating four piles of five distinct laminates with different stacking order glass and PPLSF *** them,one group of pure PPLSF and pure E-glass laminates were *** hybrid laminates were exposed to high speed stream of solid sand particle at three distinct impact velocities(48,70 and 82 m/s)and four different angles of impingement(30°,45°,60°and 90°).The effect of particle velocity,angle of impingement and stacking order on both wear rate and efficiency were *** experimental assessment reveals a significant improvement in erosive wear resistance properties due to hybridization of PPLSF with ***,the laminates with PPLSF layer as skin and glass as core layer exhibited better erosive wear resistance properties than other types of ***,a maximum value of erosion at lower velocity(48 m/s)is also noticed at 45°impingement ***,at high velocity of impact 70 m/s and 82 m/s,the maximum rate of erosion has been shifted from 45°impact angle to 60°impact *** alternation of this semi-ductile character to semi-brittle character is evidenced by analyzing the experimental *** to justify the mode of erosion,the eroded surface samples were inspected by scanning electron microscope(SEM).

关键词： hybrid composites erosion wear void micro-hardness SEM

Performance Improvement of Kenaf/Glass Polymer Hybrid Composites by Effective Application of Fish Scale Powder as Filler:A Novel Approach

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Journal of Harbin Institute of Technology(New Series) 2024年第3期31卷 80-96页

作者： Chandrakanta Mishra Deepak Kumar Mohapatra Chitta Ranjan Deo chetana Tripathy Kiran Kumar Ekka Department of Mechanical Engineering Veer Surendra Sai University of TechnologySambalpur 768018OdishaIndia

Modern technology for developing new items made from renewable resources is becoming more and more popular as a result of rising environmental ***,contemporary polymer composites have included the hybridization of natural fibers with synthetic ones,along with the inclusion of a variety of biowaste filler for developing sustainable *** this work,the kenaf/glass hybrid polyester composites are strengthened by the addition of fish scale(FS),which is taken from the fish􀆳s outermost layer of *** different stacked-order laminates,such as KKKK,KGKG,GKKG,KGGK,and GGGG,are fabricated by using the hand lay-up method with four different weight concentrations of filler content:0%,5%,10%,and 15%.Mechanical possessions such as tensile,flexural,impact strength and micro-hardness have been evaluated through experimentation in accordance with ASTM *** experimental findings revealed that,the tensile strength and micro-hardness value of KGKG laminates with 15wt% of FS filler are found to be maximum of 118.72 MPa and 17.82 HV respectively which are 39.67%and 26.11%greater than that of KGKG laminates without FS ***,the flexural and impact strength of same laminates with 10 wt% FS filler exhibited a maximum value of 142.77 MPa and 62.08 kJ/m^(2).In order to corroborate its applicability for structural and building materials in open environment,the dimensional stability of the composite has been studied through moisture absorption *** influences of FS filler loading on dimensional stability and resistance to moisture absorption capacity of laminates are also *** experimental results reflected that the addition of FS-filler has significantly improved the dimensional stability of the laminates in moist environment by reducing the moisture absorption *** further support the mode of failures,a fractography investigation of fractured surfaces was conducted.

关键词： fish scale fiber polyester hybrid composites mechanical properties

Search for pulsations in the LMXB EXO 0748-676

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Research in Astronomy and Astrophysics 2011年第5期11卷 577-582页

作者： chetana Jain Biswajit Paul Raman Research Institute SadashivnagarC.V.Raman AvenueBangalore 560080India

We present here results from our search for X-ray pulsations of the neu- tron star in the low mass X-ray binary EXO 0748-676 at a frequency near the burst- oscillation frequency of 44.7 Hz. Using the observations made with the Proportional Counter Array onboard the Rossi X-ray Timing Explorer, we did not find any pulsations in the frequency band of 44.4Hz to 45.0Hz and obtained a 3σ upper limit of 0.47% on the pulsed fraction for any possible underlying pulsation in this frequency band. We also discuss the importance of EXO 0748-676 as a promising source for the detection of Gravitational Waves.

关键词： X-ray: neutron stars - X-ray binaries: individual (EXO 0748-676)

Orbital X-ray modulation study of three supergiant HMXBs

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Research in Astronomy and Astrophysics 2009年第12期9卷 1303-1316页

作者： chetana Jain Biswajit Paul Anjan Dutta Department of Physics and Astrophysics University of Delhi Raman Research Institute SadashivnagarC.V.Raman Avenue

We present the orbital X-ray modulation study of three high mass X-ray binary systems, IGR J18027-2016, IGR J18483-0311 and IGR J16318-4848, using data obtained with RXTE-ASM, Swift-BAT and INTEGRAL-ISGRI. Using the long term light curves of the eclipsing HMXB IGR J18027-2016, obtained with Swift-BAT in the energy range 15-50keV and INTEGRAL-ISGRI in the energy range 22-40 keV, we have determined three new mid eclipse times. The newly determined mid eclipse times together with the known values were used to derive an accurate value of the orbital period of 4.5693（4） d at MJD 52168 and an upper limit of 3.9（1.2）×10^-7d d-1 on the period derivative. We have also accurately determined an orbital period of 18.5482（88）d for the intermediate system IGR J 18483-0311, which displays an unusual behavior and shares many properties with the known SFXTs and persistent supergiant systems. This is a transient source and the outbursts occur intermittently at intervals of 18.55 d. Similarly, in the third supergiant system, IGR J16318-4848, we have found that the outbursts are separated by intervals of 80 d or its multiples, suggesting a possible orbital period.

关键词： X-ray: neutron stars -- X-ray binaries: individual

Characterization of biofilms in biliary stents and potential factors involved in occlusion

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World Journal of Gastroenterology 2018年第1期24卷 112-123页

作者： chetana Vaishnavi Jayanta Samanta Rakesh Kochhar Department of Gastroenterology Postgraduate Institute of Medical Education and Research

AIM To quantify the components in biofilms and analyze the predisposing factors involved in occlusion of biliary stents. METHODS In a prospective study conducted from April 2011 to March 2014 at a tertiary care hospital, all consecutive patients who required endoscopic biliary stent exchange/removal were included. Etiology of the biliary disease was diagnosed by imaging, cytology and on follow-up. Clinical details of patients with biliary stent retrieval were noted. All extracted stents were collected in sterile containers and immediatelyprocessed for quantification of biofilm proteins and polysaccharides. Molecular identification of commonly known and unknown bacteria was performed by polymerase chain reaction and density gradient gel electrophoresis methods. RESULTS Eighty one patients(41 males) with age range of 20-86 years were studied. The underlying causes for stent insertion were bile duct stones(n = 46; 56.8%) benign stricture(n = 29; 35.8%) and malignancy(n = 6; 7.4%) with cholangitis in 50(61.7%) patients. The retrieved stent sizes were 7 Fr(n = 62; 76.5%) and 10 Fr(n = 19; 23.5%) with 65 days median insertion duration. Polybacterial consortia were detected in 90.1% of the stents. The most common bacteria identified by polymerase chain reaction alone and/or sequencing were Pseudomonas(n = 38), Citrobacter(n = 23), Klebsiella(n = 22), Staphylococcus(n = 20), Serratia(n = 16), Escherichia coli(n = 14), Streptococcus(n = 13), Enterococcus(n = 13), Aeromonas(n = 12), Proteus(n = 10) and Enterobacter(n = 9). Protein concentration according to gender(0.547 ± 0.242 mg/ml vs 0.458 ± 0.259 mg/ml; P = 0.115) as well as age > 60 years and < 60 years(0.468 ± 0.295 mg/ml vs 0.386 ± 0.238 mg/ml; P = 0.205) was non-significant. However, polysaccharide concentration was significant both according to gender(0.052 ± 0.021 mg/ml vs 0.049 ± 0.016 mg/ml; P < 0.0001) and age(0.051 ± 0.026 mg/ml vs 0.038 ± 0.016 mg/ml; P < 0.011). Protein concentration in the biofilm was signifi

关键词： Biofilm constituents Polybacterial profile Predisposing factors Underlying causes Biliary stents

Broad-band spectral study of LMXB black hole candidate 4U 1957+11 with NuSTAR

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Research in Astronomy and Astrophysics 2021年第9期21卷 11-20页

作者： Prince Sharma Rahul Sharma chetana Jain Gulab CDewangan Anjan Dutta Department of Physics and Astrophysics University of DelhiDelhi 110007India Hansraj College University of DelhiDelhi 110007India Inter-University Centre for Astronomy and Astrophysics(IUCAA) Pune411007India Indian Institute of Science Education and Research(IISER)Mohali Punjab140306India

We present here the results of broadband spectral analysis of a low-mass X-ray binary and a black hole candidate 4 U 1957+*** source was observed nine times with the Nuclear Spectroscopic Telescope A rray(NuSTAR)between September 2018 and November *** these observations,the spectral state of 4 U 1957+11 evolved *** disc dominant spectra are described well with a hot,multicolor disc blackbody with disc temperature varying in the range kT_(in)~1.35-1.86 keV and a non-thermal component having a steep slope(Γ=2-3).A broad Fe emission line feature(5-8 keV)was observed in the spectra of all the *** relativistic disc model was used to study the effect of distance,inclination and the black hole mass on its *** indicate a higher spin for smaller distances and lower black hole *** smaller distances and higher masses,spin is maximum and almost independent of the *** inverse correlation exists between the spin and the spectral hardening factor for all the *** system prefers a moderate spin of about 0.85 for black hole masses between 4-6 M⊙for a 7 kpc distance.

关键词： accretion,accretion discs black hole physics X-rays:binaries X-rays:individualU 1957+11

Pulse profile stability of the Crab pulsar

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Research in Astronomy and Astrophysics 2011年第10期11卷 1134-1142页

作者： chetana Jain Biswajit Paul Hans Raj College University of Delhi Raman Research Institute Sadashivnagar C. V. Raman Avenue

We present an X-ray timing analysis of the Crab pulsar, PSR B0531＋21, using archival RXTE data. We have investigated the stability of the Crab pulse profile, in soft （2-20keV） and hard （30-100 keV） X-ray energies, over the last decade of RXTE operation. The analysis includes measurement of the separation between the two pulse peaks and the intensity and widths of the two peaks. We did not find any significant time dependency in the pulse shape. The two peaks have been stable in phase, intensity and width for the last ten years. The first pulse is relatively stronger at soft X-rays. The first pulse peak is narrower than the second peak in both soft and hard X-ray energies. Both the peaks show a slow rise and a steeper fall. The ratio of the pulsed photons in the two peaks is also constant in time.

关键词： pulsars individual: Crab (PSR B0531+21) -- stars neutron -- X-rays

Surgeon-performed point-of-care ultrasound in severe eye trauma: Report of two cases

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World Journal of Clinical Cases 2016年第10期4卷 344-350页

作者： Fikri M Abu-Zidan Korana Balac chetana Anand Bhatia Department of Surgery College of Medicine and Health SciencesUAE University Surgical Institute AlAin Hospital

The indications of point-of-care ultrasound(POCUS) in the management of multiple trauma patients have been expanding. Although computed tomography(CT) scan of the orbit remains the gold standard for imaging orbital trauma, ultrasound is a quick, safe, and portable tool that can be performed bedside. Here we report two patients who had severe eye injuries with major visual impairment where surgeon-performed POCUS was very useful. One had a foreign body injury while the other had blunt trauma. POCUS was done using a linear probe under sterile conditions with minimum pressure on the eyes. Ultrasound showed a foreign body at the back of the left eye globe touching the eye globe in the first patient, and was normal in the second patient. Workup using CT scan, fundsocopy, optical coherence tomography, and magnetic resonance imaging of the orbits confirmed these findings. The first patient had vitreous and sub retinal haemorrhage and a full thickness macular hole of the left eye, while the second had traumatic optic neuropathy. POCUS gave accurate information concerning severe eye injuries. Trauma surgeons and emergency physicians should be trained in performing ocular ultrasound for eye injuries.

关键词： Eye Injury Trauma Point-of-care Ultrasound

COVID-19 in a liver transplant recipient:Could iatrogenic immunosuppression have prevented severe pneumonia?A case report

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World Journal of Gastroenterology 2020年第44期26卷 7076-7084页

作者： Anna Sessa Alessandra Mazzola chetana Lim Mohammed Atif Juliana Pappatella Valerie Pourcher Olivier Scatton Filomena Conti Department of Hepatology and Gastroenterology University of Naples Federico IINapoli 80131Italy APHP Unite Medicale de Transplantation Hepatique Hopital Pitie SalpetriereParis 75013France Sorbonne Universite INSERMCentre de Recherche Saint-Antoine(CRSA)Paris 75013France APHP Unite de Chirurgie Hepatobiliaire et Transplantation HepatiqueHopital Pitie SalpetriereParis 75013France APHP Centre d’immunologie et des Maladies InfectieusesInserm U1135Hopital Pitie-SalpetriereParis 75013France Hospital Felicio Rocho Barro Preto 9530Brazil APHP Service des Maladies InfectieusesHopital Pitie SalpetriereParis 75013France Sorbonne Universite INSERMInstitute of Cardiometabolisme and Nutrition(ICAN)Paris 75013France

BACKGROUND Coronavirus disease(COVID)is a new and highly contagious infectious disease caused by the coronavirus(COVID-19 or severe acute respiratory syndrome coronavirus 2).There is limited data regarding the incidence and management of COVID-19 in immunocompromised patients’*** the pre-COVID-19 era,these patients were already at an increased risk of developing opportunistic *** often manifested with atypical *** SUMMARY We report another case of uneventful COVID-19 pneumonia in a 58-year old male who was 18 mo’post liver *** received tacrolimus monotherapy since July *** clinical manifestations included only epigastric pain radiating to the right hypochondrium,nausea and *** had no fevers,cough,shortness of breath,anosmia or dysgeusia even if the chest computed tomography scan revealed an extension of the multiple patchy ground-glass density shadows to the upper lobe of the left lung *** was hospitalised and received a course of oral chloroquine(200 mg×3 per day)for a period of 10 ***,the COVID 19 infection was uneventful though there were no modifications to his tacrolimus *** was successfully *** performed subsequent follow-up via *** In light of the current pandemic,it is even more important to identify how the liver recipient’s patients present and are managed,especially for immunosuppression treatment.

关键词： Liver transplantation COVID-19 Immunosuppression Gastrointestinal symptom Infection Case report