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Resolution Enhancement of Optical Surface Plasmon Resonance Sensor Using Metamaterial

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Photonic Sensors 2015年第4期5卷 330-338页

作者： Sarika PAL Y. K. PRAJAPATI J. P. saini V. SINGH Sarika Pal Department of Electronics & Communication Engineering KIET Ghaziabad (U.P.) India yogendra Kumar Prajapati Department of Electronics & Communication Engineering MNNIT Allahabad-211004 (U.P.) India jai prakash saini Department of Electronics & Communication Engineering BIET Jhansi-284128 (U.P.) India Vivek Singh Department of Physics Faculty of Science Banaras Hindu University Varanasi (U.P.) India

In this paper, we present and discuss a an optical surface plasmon resonance （SPR） path to extend the enhancement of the resolution of sensor. Basically, our approach is to combine bi-metamaterial layers to design the SPR sensor. The calculation shows that the proposed SPR sensor structure has a preference over the conventional SPR sensors and bimetallic SPR sensors since it gives a much sharper reflectance dip and can achieve considerable sensitivity improvement when compared to the recently reported investigations. The effects of the metamaterial permittivity, permeability, and thickness on the reflectance curve are studied. It is also seen that metamaterial layers improve the field of the proposed SPR structure, which may provide a novel tool to significantly enhance the sensitivity and resolution of the sensors.

关键词： Surface plasmon resonance sensor metamaterials Fresnel equations reflectance

Bandgap engineered novel g-C_3N_4/G/h-BN heterostructure for electronic applications

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Journal of Semiconductors 2019年第3期40卷 45-49页

作者： Santosh Kumar Gupta Rupesh Shukla Department of Electronics & Communication Engineering Motilal Nehru National Institute of Technology Allahabad Department of Electrical & Electronics Engineering Loknayak Jai Prakash Institute of Technology Chhapra

The effect of an external electric field on the bandgap is observed for two proposed heterostructures graphitic carbon nitride-graphene-hexagonal boron nitride(g-C_3N_4/G/h-BN) in hexagonal stack(AAA) and graphene-graphitic carbon nitridehexagonal boron nitride(G/g-C_3N_4/h-BN) in Bernal stack(ABA). Their inter-layer distance, binding energy and effective mass has also been calculated. The structure optimization has been done by density functional theory(DFT) with van der Waals corrections. The inter-layer distance, bandgap, binding energy and effective mass has been listed for these heterostructures and compared with that of bilayer graphene(BLG), graphene-hexagonal boron nitride(G/h-BN) hetero-bilayer, graphene-graphitic carbon nitride(G/g-C_3N_4) hetero-bilayer and graphitic carbon nitride-graphene-graphitic carbon nitride(g-C_3N_4/G/g-C_3N_4) heterostructure in Bernal and hexagonal stack. g-C_3N_4/G/h-BN is found to offer lower effective mass and larger bandgap opening among the considered heterostructures.

关键词： bandgap graphene h-BN g-C3N4 binding energy DFT

Corrosion of Snails (Gastropods) in Acidic Environment and Their Protection

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Journal of Surface Engineered Materials and Advanced Technology 2019年第1期9卷 1-10页

作者： Rajesh Kumar Singh Veena Kumari Deepmala Department of Chemistry Jagdam College Jai Prakash University Chhapra India Department of Zoology Deoghar College Deoghar India

Snails’ protection is essential because this species is to maintain a balanced ecology of water sources. They occur in rivers as well as ponds and balance the pH level of water. But these sources of water are contaminated by effluents, pollutants, acid rain, particulates, biological wastes etc. They can change the pH of water. Water is absorber of carbon dioxide and it converts carbon dioxide into carbonic. Other above mentioned wastes also increase the concentration of H+ ions in water. They produce hostile environment for snails. The outer part of snails is made of CaCO3. It produces chemical reaction in acidic medium and corrosion reaction is accelerated, and thus deterioration starts on the surface of snails. This medium makes their survival become miserable. For this work, corrosion of the snails’ study in the pH values of water is 6.5 in H2CO3 environment. The corrosion rates of snails were calculated by gravimetric methods and potentiostat technique. Aloe Vera was used for corrosion protection in acidic medium. The surface adsorption phenomenon was studied by Langmuir isotherm. Aloe Vera formed thin surface film on the interface of snails which adhered with chemical bonding. It was confirmed by activation energy, heat of adsorption, free energy, enthalpy and entropy. The results of surface coverage area and inhibitors efficiency indicated that Aloe Vera developed a strong protective barrier in the acidic medium.

关键词： Corrosion Snails Aloe Vera Carbonic Acid Potentiostat Thin Film Formation

Blunt traumatic superior gluteal artery pseudoaneurysm presenting as gluteal hematoma without bony injury： A rare case report

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Chinese Journal of Traumatology 2016年第4期19卷 244-246页

作者： Annu Babu Amit Gupta Pawan Sharma Piyush Ranjan Atin Kumar Department of Surgery Jai Prakash Narayan Apex Trauma Centre All India Institute of Medical Sciences New Delhi India

Blunt traumatic injuries to the superior gluteal artery are rare in clinic. A majority of injuries present as aneurysms following penetrating trauma, fracture pelvis or posterior dislocation of the hip joint. We reported a rare case of superior gluteal artery pseudoaneurysm following blunt trauma presenting as large expanding right gluteal hematoma without any bony injury. The gluteal hematoma was suspected clinically, confirmed by ultrasound and the arterial injury was diagnosed by CT angiography that revealed a large right gluteal hematoma with a focal contrast leakage forming a pseudoaneurysm within the hematoma. Pseudoaneurysm arose from the superior gluteal branch of right internal iliac artery, which was successfully angioembolized. The patient was discharged on day 4 of hospitalization with resolving gluteal hematoma. This report highlighted the importance of considering an arterial injury following blunt trauma to the buttocks with subsequent painful swelling. Acknowledgment of this rare injury pattern was necessary to facilitate rapid diagnosis and appropriate treatment.

关键词： Angioembolization Gluteal hematoma Pseudoaneurysm Superior gluteal artery

An unusual case of symmetric quadruple limb fractures

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中华创伤杂志:英文版 2023年第5期26卷 303-307页

作者： Vivek Vijayakumar Hemant Bansal Kamran Farooque Vijay Sharma Department of Orthopaedics Jai Prakash Narayan Apex Trauma CentreAll India Institute of Medical SciencesNew DelhiIndia

A 19-year-old man had an accidental fall from the 2nd floor and sustained multiple *** radiological evaluation,the patient had symmetrical quadruple limb involvement with bilateral humerus shaft,bilateral olecranon,bilateral femur shaft,and bilateral patella *** patient was actively managed using damage control orthopaedics,and a sequence of skeletal fixation was planned based on the hemodynamic stability and periodical serum lactate *** quadruple limb fractures are very rare,which could be associated with higher mortality.A meticulous clinical evaluation,periodical blood parameter assessment and strict adherence to the principles of damage control orthopaedics can be conducive to prevent life-endangering complications.

关键词： Femoral fractures Bilateral Humerus fractures Quadruple limbs

Multiple floating metatarsals： a unique injury

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Chinese Journal of Traumatology 2013年第2期16卷 110-112页

作者： Vivek Trikha Tarun Goyal Amit K. Agarwal Department of Orthopaedics Jai Prakash Narayan Apex Trauma Centre All India Institute of Medical Sciences New Delhi 110029 India

Concomitant dislocation of the tar- sometatarsal and metatarsophalangeal joints of foot is an extremely rare injury. Such injuries presenting in a single or adjacent dual rays have been described in few cases previously. We describe such an injury in adjacent three metatarsals of a polytrauma patient. These injuries are likely to be missed in the initial assessment of a polytrauma patient. These patients are at risk of an overlooked diagnosis but the consequences of missing this type of injury may be quite severe. This case is presented in view of its unique- ness along with possible mechanism of injury, the sequence of reduction and follow-up. Knowledge of such injury and its proper management may be useful to the trauma surgeons

关键词： Metatarsal bones Metatarsophalangealjoint Wounds and injuries

Bipolar clavicular dislocation treated with biological anatomical repair and reconstruction:A case report with a literature review of management options

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Chinese Journal of Traumatology 2022年第4期25卷 245-248页

作者： Hemant Bansal Aditya jain Samarth Mittal Vivek Trikha Department of Orthopedics Jai Prakash Narayan Apex Trauma CenterAll India Institute of Medical SciencesNew Delhi110029India

Bipolar clavicular dislocation is rare,and therefore its management is *** an increase of patient’s physical demand and a near-normal shoulder function,there has been a shift in the paradigm of its management from a conservative one to a stabilized one of anatomical open *** methods of fixation have also evolved with the advent of more biological fixation devices,which elude implant or fixation related *** case report highlights the salient features of this rare case and details the management options along with the benefits of biological anatomical repair and reconstruction.

关键词： Bipolar clavicular dislocation Traumatic floating clavicle Pan-clavicular dislocation Biological repair Surgical management

Soft tissue compartment bleed-the iceberg phenomenon:a case report

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Emergency and Critical Care Medicine 2023年第1期3卷 32-35页

作者： Ramesh Vaidyanathan Parvez Mohi Ud Din Dar Dinesh Bagaria Amit Gupta Division of Trauma Surgery and Critical Care Jai Prakash Narayan Apex Trauma CenterAll India Institute of Medical SciencesNew DelhiIndia Department of Trauma and Emergency Medicine All India Institute of Medical SciencesVijaypurJammuJammu and KashmirIndia

Introduction:Hemorrhage control is the essence of trauma *** teaching is 1 on the floor(ie,external bleeding)and 4 more(thoracic cavity,abdomen,retroperitoneum,and long bones).In this case report,we present a unique case with concealed bleeding into the soft tissue compartment leading to *** case triggered to consider the soft tissue compartment as the sixth potential bleeding site in trauma patients in hemorrhagic *** presentation:We present the case with concealed bleeding into the soft tissue compartment posing a challenge in *** presentation,he had a pulse rate of 117 beats/min,a blood pressure of 90/60mmHg,and a Glasgow Coma Scale(GCS)score of *** resuscitation,the patient's blood pressure dropped to 70/46 mmHg with a GCS of 7 of *** was then intubated and ***-enhanced computed tomography of the torso revealed a right scapular fracture with a large soft tissue hematoma along the right side of the neck and chest wall,extending up to the right lumbar ***:We suggest that the soft tissue compartment is the sixth potential site of internal bleeding in trauma patients,which should not be overlooked after having ruled out the other 5 sites.

关键词： Case report Hemorrhage Shock Soft tissue injury Trauma

Varied presentations, magnitude, and outcome of traumatic neck injuries at a level I trauma center

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Emergency and Critical Care Medicine 2022年第2期2卷 45-49页

作者： Parvez Mohi Ud Din Dar Jogendra Boddeda Supreet Kaur Pratyusha Priyadarshini Abhinav Kumar Dinesh Bagaria Narendra Choudhary Junaid Alam Sushma Sagar Subodh Kumar Amit Gupta Biplab Mishra Division of Trauma Surgery and Critical Care Jai Prakash Narayan Apex Trauma CentreAll India Institute of Medical Sciences(AIIMS)New DelhiIndia Department of General Surgery All India Institute of Medical Sciences(AIIMS)JodhpurRajasthanIndia

Introduction:Traumatic neck injuries(TNIs)constitute 5%–10%of all trauma *** injuries can be caused by either penetrating or blunt *** can have a varied presentation like cut injury over the neck,bleeding,neck swelling,breathing difficulty,dysphagia,***:This was a retrospective observational study conducted at a level I trauma center in India from January 2016 to March *** hundred thirty patients who required admission and intervention due to TNIs were included in this ***:One hundred thirty patients with neck injuries were included in this *** were predominant(91.5%)with the age ranging from 10 to *** most common mechanism of injury was physical assault(40.7%),followed by road traffic injury(23.8%)and self-inflicted injuries(18.4%).Penetrating trauma was *** neck wound with bleeding was the most common presenting *** II injuries were more common(83.8%)followed by zone I(12.3%)and zone III(3.8%).Soft tissue injury including skin,platysma breach,and strap muscle injury was present in 46.9% of *** injury was present in 13.8%,tracheal injury in 28.5%,vascular injury in 13.8%,and esophageal injury in 4.6% of ***:Penetrating neck trauma is more common than blunt in developing countries like *** Trauma Life Support(ATLS)protocol guides the initial *** definitive management depends on the type and mechanism of injury,anatomical level,severity,and the organ injured.

关键词： Bleeding Neck trauma Resuscitation Trachea Vascular injury