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Compression Molded Ultra High Molecular Weight Polyethylene-Hydroxyapatite-Aluminum Oxide-Carbon Nanotube Hybrid Composites for Hard Tissue Replacement

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Journal of Materials Science & Technology 2013年第6期29卷 514-522页

作者： ankur gupta Garima Tripathi Debrupa Lahiri Kantesh Balani Department of Materials Science and Engineering Indian Institute of Technology KanpurKanpur 208016India Department of Mechanical and Materials Engineering.Florida International University MiamiFL 33174USA

Ultra high molecular weight polyethylene （UHMWPE） is widely used for articulating surfaces in total hip and knee replacements. In the present work, UHMWPE based polymer composites were synthesized by synergistic reinforcing of bioactive hydroxyapatite （HA）, bioinert aluminum oxide （Al2O3）, and carbon nanotubes （CNTs） using compression molding. Phase and microstructural analysis suggests retention of UHMWPE and reinforcing phases in the compression molded composites. Microstructural analysis elicited variation in densification due to the size effect of the reinforcing particles. The hybrid composites exhibited hardness, elastic modulus and toughness comparable to that of UHMWPE. The interfacial effect of reinforcement phases has evinced the effectiveness of Al2O3 over HA and CNT reinforcements, depicting synergistic enhancement in hardness and elastic modulus. Weak interfacial bonding of polymer matrix with HA and CNT requires utilization of coupling agents to achieve enhanced mechanical properties without deteriorating cytocompatible properties.

关键词： Compression molding Ultra high molecular weight polyethylene （UHMWPE） Hydroxyapatite Aluminum oxide （AI2O3） Carbon nanotubes （CNTs） Nanoindcntation

Effect of Alumina Dispersion on Microstructural and Nanomechanical Properties of Pulse Electrodeposited Nickel-Alumina Composite Coatings

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Journal of Materials Science & Technology 2014年第8期30卷 808-813页

作者： ankur gupta Swetha Barkam Debrupa Lahiri R.Balasubramaniam Kantesh Balani Department of Materials Science & Engineering Indian Institute of TechnologyKanpur 208016India Department of Metallurgical and Materials Engineering Indian Institute of TechnologyRoorkee 247667India

Nickel-gamma alumina（Ni—γAI2O3） composite coatings were synthesized by pulsed electrodeposition technique with different concentrations of alumina（0,10,20 and 50 g/L） in Watt’s bath.Both ultrasonic vibration and magnetic-stirring were utilized to disperse Al2O3 and to achieve its optimum loading.Microstructure shows that agglomerates occur at higher loadings,but 10 g/L Al2O3 addition in bath has shown uniform dispersion of alumina with improved mechanical properties such as hardness,Young’s modulus and yield strength by 40%,46%and 35%,respectively,when compared to that of pure Ni coating.Further,elasto-plastic indentation mechanics has shown that strength at 29%strain is enhanced to 110.5 GPa for 10 g/L Al2O3electrophoretically deposited Ni—yAI2O3 coating when compared to that of electrodeposited Ni（81.8 GPa）.

关键词： Coating Electrodeposition Ni Alumina（Al2O3） Nanoindentation Deformation mechanism

The impact of northern Indian Ocean rivers on the Bay of Bengal using NEMO global ocean model

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Acta Oceanologica Sinica 2020年第3期39卷 45-55页

作者： Atul Srivastava Anitha Gera Imran MMomin Ashis Kumar Mitra ankur gupta National Centre for Medium Range Weather Forecasting Noida 201309India Jaypee University Anoopshahr Bulandshahr 203309India

The effect of river runoff over the northern Indian Ocean(NIO) especially over the Bay of Bengal(Bo B) has been studied using global Nucleus for European Modelling of the Ocean(NEMO). Two sensitivity experiments, with and without river runoff are conducted and the influence of river runoff on the Indian Ocean hydrography,stratification and circulation features are studied. It is found that due to river runoff surface salinity over the northern Bo B decreases by more than 5 and the East India Coastal Current strengthens by 2 cm/s during post monsoon season. The fresh river water reaches up to 15°N in the Bo B and is the main cause for low salinity there.Sea surface temperature in the northwestern Bo B increases by more than 0.2℃ due to the river runoff in summer monsoon while surface cooling upto 0.2℃ is seen in north-west part of Bo B in winter season. The seasonal mixed layer depth in the region is found to be dependent on river runoff. The effect of vertical shear and Brunt Vaisala frequency on stratification is also examined. The ocean water becomes highly stratified up to 3 035 m due to the river runoff. It is found that the energy required for mixing is high in the northern and coastal Bo B.

关键词： Bay of Bengal sea surface temperature salinity mixed layer depth stratification

Dengue fever leading to acute dengue hemorrhagic leukoencephalitis:A case report

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Journal of Acute Disease 2021年第6期10卷 258-260页

作者： Shalendra Singh ankur gupta Subrat Kumar Nanda Patil Dipti Devidas Deepak Dwivedi Department of Anaesthesiology&Critical Care Armed Forces Medical CollegePune 411040India Department of Neurology Command HospitalPune 411040India

Rationale:Dengue fever is a prevalent tropical infectious disease that has a broad panorama of presentations from mild febrile illness to life-threatening manifestations in the form of dengue hemorrhagic fever and dengue shock syndrome.Patient’s concerns:A 20-year-old male presented with a 2-day history of fever,multiple episodes of vomiting,and altered sensorium.Diagnosis:Dengue fever leading to acute hemorrhagic leukoencephalitis.Interventions:Multiple transfusions of single donor platelets,intravenous methylprednisolone,intravenous immunoglobulin,anti-seizure prophylaxis,and broad-spectrum antibiotics.Outcomes:Repeat brain magnetic resonance imaging showed resolution of lesions.The patient was subsequently discharged from the hospital in a healthy state.Lessons:This report helps us to gain a better understanding of the patient’s presentation,which will help to improve the timely recognition and prevention of this rare devastating presentation.

关键词： Dengue hemorrhagic fever Dengue shock syndrome Neurological manifestations Hemorrhagic leukoencephalitis

Comparison of echocardiography and device based algorithm for atrio-ventricular delay optimization in heart block patients

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World Journal of Cardiology 2015年第11期7卷 801-807页

作者： Rajesh Vijayvergiya ankur gupta Department of Cardiology Advanced Cardiac CentrePost Graduate Institute of Medical Education and Research

AIM: To compare the atrio-ventricular(AV/PV) delay optimization by echocardiography and intra-cardiac electrocardiogram(IEGM) based Quick Opt algorithm in complete heart block(CHB) patients, implanted with a dual chamber pacemaker. METHODS: We prospectively enrolled 20 patients(age 59.45 ± 18.1 years; male: 65%) with CHB, who were implanted with a dual chamber pacemaker. The left ventricular outflow tract velocity time-integral was measured after AV/PV delay optimization by both echocardiography and Quick Opt algorithm method. Bland-Altman analysis was used for agreement between the two techniques. RESULTS: The optimal AV and PV delay determined by echocardiography was 155.5 ± 14.68 ms and 122.5 ± 17.73 ms(P < 0.0001), respectively and by Quick Opt method was 167.5 ± 16.73 and 117.5 ms ± 9.10 ms(P < 0.0001), respectively. A good agreement was observed between optimal AV and PV delay as measured by two methods. However, the correlation of the optimal AV(r = 0.0689, P = 0.77) and PV(r = 0.2689, P = 0.25) intervals measured by the two techniques was poor. The time required for AV/PV optimization was 45.26 ± 1.73 min by echocardiography and 0.44 ± 0.08 min by Quick Opt method(P < 0.0001).CONCLUSION: The programmer based IEGM method is an automated, quick, easier and reliable alternative to echocardiography for the optimization of AV/PV delay in CHB patients, implanted with a dual chamber pacemaker.

关键词： Atrio-ventricular delay optimization Complete hear

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蒸汽箱技术的创新

国际造纸 2008年第4期27卷 23-29页

作者： ankur gupta Seyhan Nuyan 竺宁张见风美卓自动化

随着技术的不断发展进步,设计产生了新一代蒸汽箱。与传统的蒸汽箱相比,新一代蒸汽箱几乎拥有2倍的热传递效率,同时减少了蒸汽消耗,拥有更高的可靠性和更好的横幅调节能力。文中重点介绍了新一代蒸汽箱的设计,并通过示例阐述了新技术有... 详细信息

随着技术的不断发展进步,设计产生了新一代蒸汽箱。与传统的蒸汽箱相比,新一代蒸汽箱几乎拥有2倍的热传递效率,同时减少了蒸汽消耗,拥有更高的可靠性和更好的横幅调节能力。文中重点介绍了新一代蒸汽箱的设计,并通过示例阐述了新技术有助于降低蒸汽箱总成本,同时又显著提高性能。

关键词：蒸汽箱技术创新热传递效率蒸汽消耗调节能力可靠性总成本

Effect of preoperative biliary drainage on outcome of classical pancreaticoduodenectomy

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World Journal of Gastroenterology 2007年第8期13卷 1240-1242页

作者： Chandra Shekhar Bhati Chandrashekhar Kubal Pankaj Kumar Sihag ankur Atal gupta Raj Kamal Jenav Nicholas G Inston Jagdish M Mehta Upgraded Department of Surgery SMS Medical CollegeJaipurIndia Liver UnitQueen Elizabeth Hospital Birmingham United Kingdom Liver Unit Queen Elizabeth Hospital Birmingham United Kingdom Upgraded Department of Surgery SMS Medical CollegeJaipurIndia

AIM: To investigate the role of preoperative biliary drainage (PBD) in the outcome of classical pancreaticodu odenectomy. METHODS: A 10-year retrospective data analysis was performed on patients (n = 48) undergoing pancreaticoduodenectomy from March 1994 to March 2004 in department of surgery at SMS medical college, Jaipur, India. Demographic variables, details of preoperative stenting, operative procedure and post operative complications were noted. RESULTS: Preoperative biliary drainage was performed in 21 patients (43.5%). The incidence of septic complications was significantly higher in patients with biliary stent placement (P < 0.05, 0 vs 4). This group of patients also had a significantly higher minor biliary leak rate. Mortality and hospital stay in each group was comparable. CONCLUSION: Within this study population the use of PBD by endoscopic stenting was associated with a high incidence of infective complications. These findings do not support the routine use of biliary stenting in patients prior to pancreatico-duodenectomy.

关键词：典型胰十二指肠切除术手术前胆汁引流结局

Thornwaldt Cyst: Case Report

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International Journal of Otolaryngology and Head & Neck Surgery 2016年第5期5卷 203-207页

作者： Kiran L. Kulsange Smita Nagle Mohan Jagade Pallavi gupta Madhavi Pandhare Kartik Parelkar Arpita Singhal Devkumar Rangaraja Reshma Hanwate Nataraj Rajanala Venkata Bandu Nagrale ankur Walli Karthik Rao Sudam Gaware Grant Government Medical College and Sir JJ Groups of Hospital Mumbai India

Thornwaldt cyst is benign, mucosal congenital cyst which is located in upper nasopharynx. It developed in nasopharyngeal bursa if opening of bursa is occluded due to infection or inflammation. It is rare congenital cyst present in nasopharyngeal bursa. Its incidence is 3% in adults [1]. The usual age of presentation is 2nd and 3rd decade [1]. It is usually asymptomatic and incidental finding on MRI but it can present as nasal obstruction, post nasal drip, halitosis, occipital headache, foreign body sensation in throat [1] [2]. Here we are presenting a case report of 23 years old male presented with foreign body sensation in throat since 5 months. On oral and nasal endoscopic examination cystic mass in nasopharynx seen, bulging in oropharynx. MRI shows cystic mass arising from left side of nasopharynx popping up in oropharynx. Cyst then excised with diode laser with both endonasal and transoral approach with zero degree rigid endoscope. Histopathology confirmed the cyst as thornwaldt cyst.

关键词： Thornwaldt Cyst Diode Laser Endosnasal and Transoral Approach

有胰 divisum 的 Choledochocele : 在磁性的回声 cholangiopancreatography 上诊断的稀罕同现

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World Journal of Radiology 2013年第7期5卷 264-266页

作者： Yashwant Patidar Nitesh Agarwal Shailesh gupta ankur Arora Amar Mukund S Rajesh Department of Radiology Institute of Liver and Biliary Sciences New Delhi 110070 India

We report a case of a 42-year-old male with symptomatic choledochocele and incidental pancreas divisum diagnosed with magnetic resonance cholangiopancreatography (MRCP). Small choledochocele is rare congenital malformation associated with non-specific symptoms and a delay in diagnosis. The coexistence of choledochocele and pancreas divisum is extremely rare with only two case reports published in literature. In both cases MRCP failed to diagnose any biliary or pancreatic abnormality. This case suggests that the patients with recurrent abdominal pain and pancreas divisum should not be presumed to be suffering from pancreatitis. Careful evaluated for additional anomalies in the biliary tree should be sought for refractory symptoms. MRCP is a useful one-stop-shop for diagnosing pancreatic and biliary ductal anomalies.

关键词： Choledochocele Pancreas divisum Magnetic resonance cholangiopan-creatography Pancreaticand biliary ductal anomalies Pancreatitis