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Quadcopter UAV Modeling and Automatic Flight Control Design

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Transactions of Nanjing University of Aeronautics and Astronautics 2017年第6期34卷 627-636页

作者： Bhatia ajeet kumar Jiang Ju Zhen Ziyang College of Automation Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016.P.R.China Jiangsu Key Laboratory of Internet of Things and Control Technologies Nanjing 210016.P.R.China

The mathematical model of quadcopter-unmanned aerial vehicle （UAV） is derived by using two approaches： One is the Newton-Euler approach which is formulated using classical meehanics; and other is the Euler-Lagrange approach which describes the model in terms of kinetic （translational and rotational） and potential energy. The proposed quadcopter＇s non-linear model is incorporated with aero-dynamical forces generated by air resistance, which helps aircraft to exhibits more realistic behavior while hovering. Based on the obtained model, the suitable control strategy is developed, under which two effective flight control systems are developed. Each control system is created by cascading the proportional-derivative （PD） and T-S fuzzy controllers that are equipped with six and twelve feedback signals individually respectively to ensure better tracking, stabilization, and response. Both pro- posed flight control designs are then implemented with the quadcopter model respectively and multitudinous simulations are conducted using MATLAB/Simulink to analyze the tracking performance of the quadcopter model at various reference inputs and trajectories.

关键词： quadcopter unmanned aerial vehicle (UAV) flight control desigm T-S fuzzy inference system propotional-derivative (PD) controller

Automatic Carrier Landing Control for Unmanned Aerial Vehicles Based on Preview Control

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Transactions of Nanjing University of Aeronautics and Astronautics 2017年第4期34卷 413-419页

作者： Zhen Ziyang Ma Kun Bhatia ajeet kumar College of Automation Engineering Nanjing University of Aeronautics and Astronautics Jiangsu Key Laboratory of Internet of Things and Control Technologies

For carrier-based unmanned aerial vehicles(UAVs),one of the important problems is the design of an automatic carrier landing system(ACLS)that would enable the UAVs to accomplish autolanding on the aircraft ***,due to the movements of the flight deck with six degree-of-freedom,the autolanding becomes *** solve this problem,an accurate and effective ACLS is developed,which is composed of an optimal preview control based flight control system and a Kalman filter based deck motion *** preview control fuses the future information of the reference glide slope to improve landing *** reference glide slope is normally a straight ***,the deck motion will change the position of the ideal landing point,and tracking the ideal straight glide slope may cause landing ***,the predictive deck motion information from the deck motion predictor is used to correct the reference glide slope,which decreases the dispersion around the desired landing ***,simulations are carried out to verify the performance of the designed ACLS based on a nonlinear UAV model.

关键词： carrier-based unmanned aerial vehicles optimal preview control automatic carrier landing system deck motion predictor

Post-fire soil nutrient dynamics in a tropical dry deciduous forest of Western Ghats,India

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Forest Ecosystems 2019年第1期6卷 67-75页

作者： Satyam Verma Dharmatma Singh ajeet kumar Singh Shanmuganathan Jayakumar Environmental Informatics and Spatial Modeling Lab Department of Ecology and Environmental Sciences School of Life Sciences Pondicherry University Landscape Level Planning and Management Wildlife Institute of India

Background: The effect of forest fire on soil is complex and relatively less understood than its above ground *** the effect of fire on forest soils can allow improving management of valuable forest ecosystems as adequate and proper information is very important for efficient management. We have studied the recovery of soil properties after fire, using a chronosequence approach(two, five and fifteen years after fire and control). Soil samples were collected from each plot of four fire patches(B0, B2, B5 & B15) from three different depths viz. 0–10(Top), 10–20(Middle), and 20–30 cm(Bottom).Results: Soil organic carbon was lower than unburned plots after the fire and could not recover to the level of unburned plot(B0) even in 15 years. Total N, available P, and extractable K were lower 2-years and 5-years after the fire but are higher than unburned plot after 15-years. Available nitrogen(NO_3^- and NH_4^+) remain unchanged or higher than B0 in burned patches. Soil pH, Bulk Density, Water Holding Capacity, and Electrical Conductivity was lower initially after the fire. Forest fires have affected soil properties considerably. The response of soil properties varied with years after fire and soil ***: Forest fires occur very frequently in the study area. Significant quantities of carbon and total nitrogen are lost to the atmosphere by burning of litter, duff, and soil OM. Because nitrogen is one of the most important soil nutrients, the recapture of N lost by volatilization during a fire must receive special attention. Long-term studies are required to better understand the recovery of soil nitrogen.

关键词： Soil properties Western Ghats Tropical dry deciduous Forest Forest fire Forest soils

Current status and future prospects of bacilli-based vector control

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Asian Pacific Journal of Tropical Medicine 2020年第12期13卷 525-534页

作者： Joleen Savianne Almeida ajeet kumar Mohanty Savita Kerkar Sugeerappa Laxmanappa Hoti Ashwani kumar ICMR-National Institute of Malaria Research DHS BuildingCampalPanajiGoa-403001India Department of Biotechnology Goa UniversityGoa-403206India National Institute of Traditional Medicine Nehru NagarBelagavi-590010KarnatakaIndia ICMR-Vector Control Research Centre Indira NagarPuducherry-605006UTIndia

Mosquito-borne diseases such as malaria,filariasis,dengue,chikungunya,Japanese encephalitis,yellow fever and Zika contribute significantly to health problems of developing as well as developed *** control is central to control of vector borne *** the last four-five decades,biological control methods have been inducted in the integrated vector management strategy,advocated nationally as well as globally by the World Health ***,biological control of vectors is globally acknowledged as the best available strategy in the wake of growing concerns about vector resistance as well as adverse effects of insecticides on the environment and non-target fauna co-inhabiting the same ecological niches as *** India and elsewhere,efforts are ongoing to screen newer isolates to bring forth new biolarvicidal products of public health *** this review,by carrying out extensive literature survey,we discuss advances thus far and the prospects of bacilli-based control of vectors and vector borne diseases.

关键词： globally yellow advances

Randomized controlled trial of topical EMLA and vapocoolant spray for reducing pain during wDPT vaccination

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World Journal of Pediatrics 2017年第3期13卷 236-241页

作者： Navratan kumar Gupta Amit Upadhyay ajeet kumar Dwivedi Astha Agarwal Vijay Jaiswal Abhishek Singh Department of Pediatrics LLRMMedical CollegeMeerut(UP)India

Background:Intramuscular vaccination is among the most common source of iatrogenic pain in *** sprays are rapid-acting alternative to topical *** provide transient anesthesia via evaporation induced skin cooling,and reduce pain due to vaccine injection in children and *** objective was to compare the synergistic analgesic effect of eutectic mixture of local anesthetics (EMLA) with breastfeeding (EB group) and vapocoolant spay with breastfeeding (VB group) to that of only breastfeeding (BO group) during whole cell diptheria,pertussis and tetanus (wDPT) ***:A double blind randomized controlled trial was done to include infants up to 3 months of age who came for their first wDPT *** primary outcome variable was the duration of cry after *** outcome variables were Modified Facial Coding Score,Neonatal Infant Pain Scale and latency of onset of ***:Of the 201 eligible participants,111 babies were excluded and remaining 90 babies were randomized into three groups of thirty *** groups did not differ significantly in baseline *** (interquartile range,IQR) of duration of cry was lesser [35.86 (21.07-107.75) seconds] in babies receiving EMLA cream with breast feeding (EB group) and in babies receiving vapocoolant spray with breast feeding (VB group) [32.58 (21.25-106.21) seconds] as compared to babies receiving only breast feeding (BO group) [67.5 (27.6-180) seconds] (P=-0.147).Difference in median (IQR) of latency of cry was not statistically *** Facial Coding Score and Neonatal Infant Pain Scale at 1 minute and 3 minutes was significantly lower in the EB and VB group,as compared to the BO group (P<0.05).Conclusions:Addition of topical EMLA application or vapocoolant spray to breastfeeding during wDPT vaccination does not reduce duration of cry in infants up to 3 months of ***,they are able to show reduction in pain score and further studi

关键词： diptheria,pertussis and tetanus vaccine eutectic mixture of local anesthetics Modified Facial Coding Score Neonatal Infant Pain Scale

Successful fiberoptic orotracheal intubation by lifting large thyroid mass and tongue protrusion in left lateral position:a case report

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Emergency and Critical Care Medicine 2024年第2期4卷 97-99页

作者： Sarfaraz Ahmad Neeraj kumar ajeet kumar Saravanan Palasevam Department of Anaesthesiology All India Institute of Medical Sciences PatnaBiharIndia

Introduction:Awake fiberoptic bronchoscopy has long been considered the criterion standard for the management of difficult airways because of large thyroid *** an unsuccessful attempt to intubate with a fiberoptic bronchoscope in the supine position,the decision to switch to the left lateral position was *** present this case to propose the utilization of the lateral position for awake *** presentation:We report a rare case of a patient with a large papillary carcinoma of the thyroid planned for surgical *** patient presented to our hospital with complaints of difficulty breathing while lying down in the supine position and oozing blood from the necrotic *** breathing difficulties subsided in the lateral ***:We demonstrated how the left lateral position with an adjunct maneuver facilitates intubation in large thyroid malignancies.

关键词： Awake intubation Case report Lateral position Thyroid malignancy

Boosting the energy harvesting performance of cantilever structured magneto-mechano-electric generator by controlling magnetic flux intensity on magnet proof mass

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Journal of Materiomics 2023年第4期9卷 735-744页

作者： Deepak R.Patil Seungah Lee Atul Thakre ajeet kumar Hyunseok Song Dae-Yong Jeong Jungho Ryu School of Materials Science and Engineering Yeungnam UniversityGyeongsan38541South Korea Centre for Functional Materials Vellore Institute of TechnologyVellore632014TamilnaduIndia Department of Materials Science&Engineering Inha UniversityIncheon22212South Korea Institute of Materials Technology Yeungnam UniversityDaehak-roGyeongsan38541South Korea

A cantilever-structured magneto-mechano-electric(MME)generator comprising a magnetoelectric composite with a magnet proof mass is a potential candidate for powering autonomous wireless sensor ***,the concept of a magnetic flux concentrator(MFC)to enhance the output performance of the MME generator by focusing the ultralow-intensity magnetic field into the MME generator was ***,the MFC-concentrated magnetic flux mostly focused on the end tip of the MME cantilever rather than at the magnet proof mass located on the cantilever *** that the torque generated by the magnet proof mass contributes more than half of the output power of an MME generator,optimizing the volume and position of the proof-mass with MFC is crucial for better ***,a smaller proof-mass is desirable for the long-term reliability of cantilevertype ***,we investigated the effect of the position and weight(volume)of the magnet proof mass with respect to the MFC on the output performance of the MME generator through finite element analysis and *** MME generator with the lighter magnet proof mass at the optimized position generated a maximum power of 5.35 mW under a 10 Oe magnetic field,which was 210%of that of the MME configuration used in our previous ***,the MME generator showed broadband characteristics around the practical frequency of 60 Hz,which could provide more freedom to design the harvester with high performance.

关键词： Magneto-mechano-electric Magnetic flux concentrator Magnet proof mass Broadband IoT sensor

Effect of flaxseed supplementation on metabolic state,endocrine profiles,body composition and reproductive performance of sows

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Asian pacific Journal of Reproduction 2021年第3期10卷 127-136页

作者： Sukhjinder Kaur Ashwani kumar Singh Mrigank Honparkhe ajeet kumar Prahlad Singh Udeybir Singh Department of Veterinary Gynaecology and Obstetrics Guru Angad Dev Veterinary and Animal Sciences UniversityLudhianaPunjabIndia Department of Animal Nutrition Guru Angad Dev Veterinary and Animal Sciences UniversityLudhianaPunjabIndia

Objective:To assess the effect of flaxseed supplementation on metabolic profile,endocrine concentrations,non-esterified fatty acids(NEFA),body composition variables,and reproductive performance of ***:All the 21 crossbred Large White Yorkshire sows were considered in the study period starting at day 1 of current farrowing when the feeding of specific supplemental ration was started until the day of subsequent farrowing(days 150-155)and were equally allocated into three *** 1 served as the control group and followed their normal feeding *** 2 and group 3,in addition to their normal feeding schedule,were supplemented with flaxseed at a rate of 0.5%and 1.0%of the dry matter,*** samples were collected 15 days prior to farrowing,on the day of farrowing(day 0),at weekly intervals until day 28 of lactation and at monthly intervals during gestation to harvest the *** was used to assess the metabolic and endocrine status of *** weight of each sow and individual birth weight of all piglets born were ***:Flaxseed supplementation led to decrease in plasma cholesterol and triglyceride levels in the supplemented groups than in the control group(P0.05).Conclusions:Flaxseed improves endocrine profiles,NEFA concentrations and body weight,resulting in better pregnancy rate and litter size.

关键词： Endocrine profile Flaxseed Non-esterified fatty acids Piglet mortality Pregnancy rate Sow

Improvement in cryosurvival of buffalo bull (Bubalus bubalis) sperm by altering freezing rate within critical temperature range

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Asian pacific Journal of Reproduction 2018年第2期7卷 72-78页

作者： Jasmer Dalal ajeet kumar Pradeep kumar Mrigank Honparkhe Vijay Singh Malik Sumit Singhal Simarjeet Kaur Parkash Singh Brar Department of Veterinary Gynaecology and Obstetrics Guru Angad Dev Veterinary and Animal Sciences UniversityLudhiana141004Punjab India Department of Buffalo Physiology and Reproduction Central Institute for Research on BuffaloHisar125001HaryanaIndia Livestock Farms Complex Guru Angad Dev Veterinary and Animal Sciences UniversityLudhiana141004Punjab India

Objective:To optimize the cryopreservation of buffalo bull semen by altering freezing rates within critical temperature range (4℃ to -60℃). Methods: A total of 20 ejaculates each from 5 Murrah buffalo bulls were cryopreserved using programmable biofreezer in 2 phases. In the 1st phase, 9 freezing rates were applied at -2, -5, -10, -20, -30, -40, -50, -60 or -4℃/min (control) from 4℃ to -15℃;at -40℃/min from -15℃ to -60℃. In the 2nd phase, a fixed freezing rate was applied at -30℃/min from 4℃ to -15℃. Six freezing rates were applied at -10, -20, -30, -40 (control), -50 or -60℃/min from -15℃ to -60℃. The freezing from -60℃ to -140℃ were fixed at -50℃/min in both the phases. Post thaw semen quality was assessed in terms of motility, viability, membrane integrity (hypo-osmotic swelling test), sperm abnormalities, and active mitochondria. Data were arc sine transformed and analyzed through one-way analysis of variance using SPSS software. Results: In the 1st phase, percent individual motility, progressive motility and viability were similar among various protocols. Percent hypo-osmotic swelling reactive sperm was higher with freezing at -30℃/min. In the 2nd phase, percent individual motility, viability and hypo-osmotic swelling reactive sperm was higher with freezing at -50℃/min. Sperm head abnormalities were lower at -30℃/min in the 1st phase, but were similar among the protocols of the 2nd phase. Percent active mitochondria were higher at -30℃/min in the 1st phase and at -50℃/min in the 2nd ***:The optimum post thaw semen quality of buffalo bull could be obtained by applying freezing rate at -30℃/min (4℃ to -15℃) and at -50℃/min (-15℃ to -140℃), followed by plunging of straws in into liquid nitrogen for storage.

关键词： Buffalo bulls Freezing rate Critical temperature range Programmed freezing