Relevant bibliographies by topics / Aerial yam

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Academic literature on the topic 'Aerial yam'

Author: Grafiati
Published: 4 June 2025
Last updated: 23 June 2025

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Journal articles on the topic "Aerial yam"

1

Umoh, Enobong Okon, and Sunday Peter Ukwo. "Assessment of Some Anti-Nutritional Factors in Extruded Soybean and Aerial Yam Flour Blend." African Journal of Agricultural Science and Food Research 16, no. 1 (2024): 40–50. http://dx.doi.org/10.62154/ajasfr.2024.016.010389.

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This study assesses the levels of some anti-nutritional factors (ANFs) in extrudates produced from the blend of soybean and aerial yam flours. The soybean and aerial yam flours were blended in a ratio of 3:1 (75% soybean flour, 25% aerial yam flour). The blended soybean and aerial yam flours were then extruded using a laboratory scale single-screw extruder at 33% feed moisture content; 110 barrel temperature and 130 rpm screw speed. The results of the laboratory analysis of the extrudates show that the levels of anti-nutritional factors were 73.80 mg/100g of sample for oxalates; 1.81 mg/100g of sample for tannin; 25.39 mg/100g of sample for phytate; 2.22 mg/100g of sample for hydrogen cyanide (HCN); and 1.64% for alkaloids. This study has shown that the levels of the anti-nutritional factors in the extrudates produced from soybean and aerial yam flours blend are minimal, and are below the FAO/WHO recommended safe level of toxicity to humans, and these anti-nutritional factors can be reduced to the level of non-toxicity, through extrusion processing technology.
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Anoshirike, Cyril, Elizabeth Chukwuemeka, Ngozi Nnam, Elizabeth Udenta, and Kelechi Anoshirike. "Effect of traditional food processing methods on the nutrient and anti-nutrient composition of aerial yam (Discorea bulbifera) flour." Journal of Dietitians Association of Nigeria 13, no. 2 (2023): 35–41. http://dx.doi.org/10.4314/jdan.v13i2.5.

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Background: Aerial yam bulbil is one of the high-yielding food crops with quality nutrients. It has great potential to contribute to food security. However, this food crop is often underutilized. Therefore, the traditional methods of processing it into flour to increase food diversity, reduce post-harvest loss, improve nutrient quality, and reduces anti-nutrients are often unexploited in Nigeria.
 Objective: The study evaluated the effect of traditional food processing methods on the nutrient and anti-nutrient composition of Aerial Yam bulbil flours.
 Results: Germinated and fermented aerial yam flour had higher Protein (21.30%) and Fat (3.32%) and least carbohydrate (65.78%) and ash (3.95%), while sample UAYF and GFAYF had higher fibre (3.95%). GFAYF had higher zinc (0.13mg), iron (3.55mg), calcium (3.34mg), and phosphorous (84.39mg). GFAYF had reduced Phytate 4.73mg; Tannins (1.24mg); Hydrogen Cyanide (4.16mg); Oxalate (2.38mg); but increased Saponin (0.12mg) respectively.
 Conclusion: Combined germination and fermentation improved nutritional quality and decreased the anti-nutritional content of Aerial yam flour. This product can be used for the preparation of healthy and therapeutic dishes.
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Emmanuel, C. Nwadike., N. Abonyi. Matthew, T. Nwabanne. Joseph, and E. Ohale Pascal. "Optimization of Solar Drying of Blanched and Unblanched Aerial Yam using Response Surface Methodology." International Journal of Trend in Scientific Research and Development 4, no. 3 (2020): 659–66. https://doi.org/10.5281/zenodo.3892511.

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This paper focuses on the application of response surface methodology RSM for the modelling and optimization of unblanched and blanched aerial yam drying using solar dryer. Mass in gram of the sample, slice thickness of the sample, and the airspeed of dryer are the independent variables considered, while the response of interest is the moisture content. RSM via central composite design CCD was used to optimize the variables of interest, while artificial neural network was used to validate the result. The result showed that a second order polynomial regression model could convincingly interpret the drying process of the aerial yam. A coefficient of determination R2 value of 0.9991 and 0.9828, model F value of 1186.03 and 60.75 for unblanched and blanched aerial yam respectively were obtained. P value 0.0001 , and low value of coefficient of variation 2.43 and 9.75 for unblanched and blanched sample indicated the fitness of the model. The optimum process variable obtained were 71 g, 3.2 mm and 1.5 m s, and 70 g, 3.0 mm and 1.5 m s for blanched and unblanched sample, respectively. Emmanuel C. Nwadike. | Matthew N. Abonyi. | Joseph T. Nwabanne. | Pascal E. Ohale "Optimization of Solar Drying of Blanched and Unblanched Aerial Yam using Response Surface Methodology" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-4 | Issue-3 , April 2020, URL: https://www.ijtsrd.com/papers/ijtsrd30598.pdf Paper Url :https://www.ijtsrd.com/engineering/mechanical-engineering/30598/optimization-of-solar-drying-of-blanched-and-unblanched-aerial-yam-using-response-surface-methodology/emmanuel-c-nwadike
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Tewodros, Mulualem, Mohammed Hussein, and Diro Mulugeta. "Assessment of Indigenous Knowledge for Selection and Classification of Aerial Yam(Dioscorea Bulbifera (L.)) Accessions in South and Southwestern Ethiopia." Greener Journal of Plant Breeding and Crop Science 2, no. 2 (2014): 41–46. https://doi.org/10.15580/gjpbcs.2014.2.112913993.

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Participatory evaluation on forty seven accessions of the aerial yam (Dioscorea bulbifera) was carried out in woldiya peasant association, which is a major D. bulbifera growing area of Jimma zone and near to Jimma Agricultural Research Center. The objectives of the study were to select aerial yam accessions based on key morphological traits and classification of D. bulbifera accessions based on maturity and farmers’ utilization options. Twenty households from the PA were selected based on consultation with key informants knowledgeable about the crop to determine yam selection, classification systems, and on different management practices through the entire growing period of aerial yam during the 2007/2008 growing season. The results of the evaluation indicated that from all accessions of D. bulbifera, 14 (29.78%), 22(46.8%) and 11(23.4%) of accessions are early, medium and late maturing respectively. Besides this, 62.5%, 25.0% and 12.5% of the farmers selected the late, medium and early maturing D. bulbifera accessions based on total yield (bulbils and tuber). Even if 62.5% of participated farmers preferred late maturing aerial yam accessions by total yield, most of the farmers selected the early and medium types due to the ease of harvesting and market value. Based on organoleptic test of tuber and bulbils, 60 and 85% of the farmers preferred late maturing accessions. On the bases of overall criteria, the late maturing accessions had the first ranks by farmers’ evaluation.
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E.C., Nwadike, Enibe S.O, and Nwabanne J.T. "Determination of the Engineering Properties of Aerial Yam and Water Yam." International Journal of Advances in Scientific Research and Engineering 4, no. 11 (2018): 297–306. http://dx.doi.org/10.31695/ijasre.2018.32965.

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Egbuta, Kalu Chibuike. "Essential Amino Acid Composition of Noodles Analogue from Aerial Yam, Rice and African Yam Bean Flour Blend Using Response Surface Methodology." European Journal of Nutrition & Food Safety 15, no. 11 (2023): 76–97. http://dx.doi.org/10.9734/ejnfs/2023/v15i111357.

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Response surface technology was used to evaluate the essential amino acid of noodles analogue from Aerial yam (Dioscorea bulbifera), Rice (Oryza sativa), and African yam bean (Sphenostylissternocarpa) flour mixture. Flours from Aerial yam, rice, and African yam bean were individually produced blended in the ratio of 50%: 25%: 25%, respectively and extruded using Brabender single screw laboratory extruder (Duisburg DCE 330 Model) filled with 3.0mm die nozzle diameter. A central composite rotatable design ( CCRD) with three variables, namely barrel temperature, feed moisture content and screw speed and fire level coded -a, -1, 0, +1, +a, was used in the experimental design to obtain 20 samples of noodles analogue. Essential Amino Acid profiling was done on the noodles analogue and data was analyzed by regression analysis. Results showed that lysine content ranged from 4.55 to 7.55mg/100g, valine content ranged from 3.81 to 5.06mg/100g, methionine content ranged from 0.86 to 2. 24mg/100g, phenylalanine content ranged from 5.06 to 5.45mg/100g, histidine content ranged from 3.09 to 4.20mg/100g, tryptophan content ranged from 0.83 to 1.96mg/100g, leucine content ranged from 6.87 to 7.90mg/100g, isoleucine content ranged from 2.91 to 4.91mg/100g, threonine content ranged from 3.55 to 4.44mg/100g. The coefficients of determinations (R2) were high and ranged from 0.8987 to 0.9916 at 5% level. The response surface plots suggest that the models developed had a good fit and the CCRD was effective in explaining the effect of the process condition on noodles analogue as influenced by barred temperature, feed moisture content and screw speed of the extruder. The data obtained from the study could be used for the control of product characteristics. The study indicated improved noodles analogues from Rice, Aerial yam, and African Yam Bean can be produced as noodles analogues.
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Sánchez-López, Diana Beatriz, Lily Lorena Luna-Castellanos, Manuel Ramón Espinosa-Carvajal, Dairo Javier Pérez-Polo, and Jorge Cadena-Torres. "Capacidad de infección de hongos asociados a la pudrición seca de los tubérculos de ñame." Revista de Investigaciones Altoandinas - Journal of High Andean Research 23, no. 3 (2021): 149–58. http://dx.doi.org/10.18271/ria.2021.305.

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Dry rot of tubers is one of the most devastating diseases in yam production (Dioscorea rotundata Poir.) in the Caribbean region of Colombia. The disease attacks tubers, causing production losses during cultivation. In previous experiments, 11 fungal morphotypes were isolated and associated with this disease in yam crops in the Caribbean region of Colombia. The present investigation was carried out under greenhouse conditions to determine the infection capacity of these 11 possible causative agents, in 150-day-old plants of two yam genetic materials (0307-49SB y 0307-50CB). The results indicated that morphotypes DH2 (Lasiodiplodia theobromae), DH11 (Curvularia aeria), DH20 (Aspergillus niger), and DH17 (Fusarium equiseti), showed the highest infection capacity to yam tubers, regardless of the genetic material. Therefore, they were considered as the main causal agents of the disease in the Caribbean region of Colombia. The remaining seven (7) morphotypes, despite having been inoculated in the roots of the plants, showed minor effects on tubers and affected other organs of the plant, especially stems and aerial part of yam plant. This study allows concentrating the research on these four morphotypes to develop crop management strategies that might allow reducing the incidence of this disease in the Caribbean region of Colombia.
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Okon, Umoh, Enobong. "Effect of extrusion process parameters on the overall acceptability of snacks produced from aerial yam and soybean flour mixture." Agriculture and Food Sciences Research 12, no. 1 (2025): 19–24. https://doi.org/10.20448/aesr.v12i1.6555.

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This study was conducted to evaluate the effect of extrusion cooking parameters on the overall acceptability of the snacks produced from aerial yam and soybean flour mixture. Design Expert (version 11.0.1) was used in the experimental design, with a three-factor experimental setup at five levels each. The aerial yam and soybean flour mixture was formulated in the ratio of 1:3 and extruded using a laboratory-scale single-screw extruder. Response Surface Methodology was adopted in analyzing the effect of the independent variables on the dependent variable. Results showed that the overall acceptability scores ranged from 4.20 to 7.10. Response surface analysis revealed that an increase in barrel temperature, screw speed, and feed moisture resulted in an increase in overall acceptability. The overall acceptability of the snacks was significantly (p < 0.05) affected by barrel temperature and feed moisture, while the screw speed had no significant (p > 0.05) effect on overall acceptability. The interaction of the extrusion cooking parameters had a significant (p < 0.05) effect on the overall acceptability of the snacks. The high range of scores recorded for the snacks indicates that the aerial yam and soybean composite flour extruded snacks were generally well accepted by the panelists.
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Jiwuba, P.C, L.C Ezenwaka, K. Ikwunze, and N.O Nsidinanya. "Growth Performance, Haematological, Carcass and Organ Characteristics of Broiler Birds Fed Aerial Yam (Dioscorea bulbifera) Tuber Meal." International Journal of Case Studies 5, no. 8 (2016): 197–203. https://doi.org/10.5281/zenodo.3531457.

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A-48 day feeding trial was conducted to determine the effects of dietary levels of aerial yam tuber meal (AYTM) on growth performance, haematological, carcass and organ characteristics of broiler birds. Five experimental diets were formulated to include aerial yam tuber meal at 0%, 4%, 8%, 12% and 16% at the starter stage and 0%, 8%, 16%, 24% and 32% at the finisher phase for T1, T2, T3, T4 and T5 respectively. One hundred and twenty (120) day old Anak broiler chicks were used and randomly divided into five groups with each group randomly allotted to the five treatment diets in a Completely Randomized Experimental Design (CRD). Each group was further subdivided into three (3) replicates of eight birds each. The experimental starter and finisher diets were fed ad libitum. Data were collected for growth performance, haematological parameters, carcass and organ characteristics. Total body weight gain and average daily feed intake were significantly (P0.05) difference among the treatment groups. Aerial yam tuber meal showed a good promise when included in the diets of broiler starter and finisher up to 32% without a harmful effect on growth performance, haematological and carcass and organ characteristics of broilers. It can be therefore recommended as a cheaper alternative to maize in broiler feeding.
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Mondo, Jean M., Paterne A. Agre, Alex Edemodu, et al. "Floral Biology and Pollination Efficiency in Yam (Dioscorea spp.)." Agriculture 10, no. 11 (2020): 560. http://dx.doi.org/10.3390/agriculture10110560.

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Yam (Dioscorea spp.) is a monocotyledonous herbaceous vine cultivated for its starchy underground or aerial tubers in the tropics and subtropics. It is an allogamous and polyploid species that reproduces by both sexual and asexual mechanisms. However, many of the landrace cultivars, including most of the popular varieties, reproduce exclusively by vegetative propagation (planting the tubers). These varieties are either sterile or produce sparse and irregular flowering with high flower abortion rate, low fruit and seed set. Production of crossbreed seeds for genetic improvement and for maintaining genetic diversity in yams is, therefore, mainly achieved through natural or managed pollination. Flowering in yam is mostly dioecious and, in some instances, monoecious. Flowering asynchrony, sticky nature of the pollen grains, and cross incompatibility are among the challenges in making genetic progress in yam breeding. There are many limitations in basic and applied knowledge of yam flower biology and pollination. This paper, therefore, reviews the flowering biology, pollination, and methods of improving pollination efficiency in yam breeding programs.
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Books on the topic "Aerial yam"

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Tal, Duby. Ḳav ha-ofeḳ Ḥefah: Karmel ba-yam yavo. Miśrad ha-biṭaḥon, 1997.

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1950-, Haramati Moni, ред. Yofyo eno yaduʻa: Pilʼe Yam ha-Melaḥ. Albaṭros, 2010.

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Si, Ha, ed. Aertai zhu yu yan yan jiu. Nei Menggu jiao yu chu ban she, 2004.

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Jianqi, Zhou, ed. Aertai yu yan xue dao lun. Nei Menggu jiao yu chu ban she, 2004.

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Jianqi, Zhou, ed. Aertai yu yan xue dao lun. Nei Menggu jiao yu chu ban she, 2004.

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Ou, Zhihao. Gao yi dian kan Xianggang: Yao kong fei ji fa xian Xianggang zhi mei. Wan li ji gou, wan li shu dian, 2011.

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King, Thomas F. World War II Japanese aircraft at the Old Colonial Airport, Yap State, Federated States of Micronesia: A reconnaissance and assessment. TIGHAR, 2006.

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1948-, Gebhardt James F., Utkin Igor 1960-, Grinberg Ilya 1955-, and Higgins Terry 1962-, eds. Dragons on bird wings: The combat history of the 812th Fighter Regiment. Aviaeology, 2006.

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Meng, Dalai. Bei fang min zu de li shi jie chu yu Aertai yu yan gong tong xing de xing cheng. Zhongguo she hui ke xue chu ban she, 2001.

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Juszczak, Artur. Yakovlev Yak-3. Mushroom Model Publications, 2017.

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Book chapters on the topic "Aerial yam"

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Pattar Prathamesh and Naik Apurva. "Design and Control of Quad-Copter Using GPS and Inertial Sensors for Parcel Delivery." In Frontiers in Artificial Intelligence and Applications. IOS Press, 2016. https://doi.org/10.3233/978-1-61499-674-3-167.

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This paper highlights our research towards development of a quadcopter to deliver postal mails and confidential letters from source to destination. The system consists of Unmanned Aerial Unit, Control System, Control Link and other Support equipment. The Unmanned Aerial Unit is controlled by the Control System which communicates with the Ground Control Station (GCS) via a control link that is Micro Air Vehicle (MAV) link. A GCS is a software application that communicates with the quadcopter via radio telemetry. The basic flight of the quadcopter all depends on the motor speed and direction. Motor speed is controlled by the Pulse Width Modulation (PWM) signal by changing the duty cycle as required. Inertial sensors are sensors that work on the principle of inertia. The inertial measurement unit consists of Accelerometer, magnetometer and gyroscope. These sensors are placed on the quadcopter to acquire current position and orientation along with a roll, yaw and pitch positions. The Ultrasonic sensor is also used in order to detect any obstacles in the desired path of the fly. As a result, the software application at the GCS will have a panel which will display all the information related to the quadcopter system. Global Positioning System (GPS) is used in order to decide the coordinates or the waypoints from source to destination. As a final product, the quadcopter flies autonomously from source to destination tracing the path all by itself using the GPS module placed on it. Another option of controlling the quadcopter by remote control is also possible.
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M. Kumar, Giri, Mattia Gramuglia, and Andrea L’Afflitto. "Robust Hybrid Model Reference Adaptive Control and Output-Feedback Linearization with Applications to Quadcopter UAVs." In Latest Adaptive Control Systems [Working Title]. IntechOpen, 2024. http://dx.doi.org/10.5772/intechopen.1004814.

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This chapter presents the first robust model reference adaptive control (MRAC) system for hybrid, time-varying plants affected by parametric, matched, and unmatched uncertainties as well as uncertainties in the plant’s discrete-time dynamics. This continuous-time component of this MRAC system comprises both an adaptive law and a control law that are analogous to the adaptive law and control law of classical MRAC systems. The discrete-time component of the proposed MRAC system comprises a resetting mechanism that counters the effect of resetting events in the plant dynamics. The mechanisms that guarantee robustness to unmatched uncertainties extend the well-known σ-modification and e-modification of MRAC as well as the use of continuous projection operators to a hybrid systems framework. This adaptive control framework is applied to the problem of controlling output-feedback linearized dynamical models while switching among multiple feedback-linearizing output signals according to any user-defined algorithm that is compatible with the conditions sufficient for the existence of the linearizing diffeomorphism. As an example, we solve the problem of controlling the dynamics of a quadcopter unmanned aerial vehicle (UAV) tasked with following both a user-defined trajectory and a user-defined attitude, and not just a user-defined yaw angle as it occurs in the overwhelming majority of works on this topic.
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G. C, Dr Somashekhar, Dr Keshavamurthy, and Prakash R. L. "SUSTAINABLE FARMING USING AEROPONICS CULTIVATION." In Futuristic Trends in Network & Communication Technologies Volume 3 Book 2. Iterative International Publisher, Selfypage Developers Pvt Ltd, 2024. http://dx.doi.org/10.58532/v3bgnc2p2ch3.

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Aeroponics, a soilless farming method derived from the Latin words 'aero' (air) and 'ponic' (labor), offers a promising solution to address the future food crisis. It is gaining popularity among many individuals due to its speed, cost-effectiveness, and innovative approach. As a form of hydroponic technique and vertical farming, aeroponics allows precise control of root zone nutrients, water regimes, and environmental conditions throughout the entire crop's life. In this modern farming system, plants are cultivated without or with minimal use of soil. The roots of the plants are suspended in the air, and essential nutrients are delivered to them through a nutrient chamber, where they are sprayed onto the roots. Aeroponic farming boasts numerous advantages, including excellent aeration, efficient water use, reduced time, space requirements, and independence from seasonal constraints, disease-free plant propagation, and large-scale plant production capabilities.To facilitate easy monitoring and automation, a LCD display provides details of temperature and humidity, with data transmitted to a computer. The computer, in turn, helps regulate actuators responsible for distributing water and nutrients, further optimizing the growth conditions for the plants. Aeroponic techniques have proven to be commercially successful for various applications, including propagation, seed germination, seed potato production, tomato production, leaf crops, and micro-greens. Notably, vegetable crops like potatoes, yams, tomatoes, lettuce, and leafy greens are being cultivated with great success in aeroponic systems. This method has demonstrated its feasibility in producing both aerial parts and roots of plants efficiently and effectively. As a result, aeroponics shows great promise in revolutionizing farming practices and contributing to sustainable food production for the future.
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Penev, Valentin. "Augmented Radiation Tracking System for Autonomous Fixed Wing Platform with Model-Based Control and Inverse Dynamics and Path Following." In Modeling and Control of Autonomous Systems [Working Title]. IntechOpen, 2025. https://doi.org/10.5772/intechopen.1008806.

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The demonstrator of a fixed-wing tandem unmanned aerial vehicle (UAV) is designed for the passive detection of radiation fixed on ground targets. When the target does not emit, the autonomous platform navigates to the target using a proposed navigation and guidance algorithm. A specific approach is used to design the 6D trajectory to the target. Novel combinations of a three-loop autopilot, inverse dynamics control, and model-based control are used to follow the platform’s path to the target. The absence of a permanently radiated signal from the target poses challenges, which have been addressed in this research. Some challenges of the passive radiation tracking, autonomously flying platform, particularly inaccurate trajectory control, have, in certain instances, been avoidable. Until a certain point, the strapped-down radiation seeker passes the elevation and azimuth of the target to the autopilot. Then, the vehicle flies in full autonomous mode to the very close vicinity of the target, where the secondary seeker takes control. A solution in SimuliNK was developed to simulate vehicle dynamics, inertial sensors, and its Guidance Navigation and Control (GNC) algorithms. The proposed unconventional approach for determining platform attitude in 6D space enhances guidance accuracy. An original model-based control with specific tuning algorithms is proposed, evaluated, and tested in simulations and some real flights. The results show that the vehicle’s performance in response to excessive and agile roll, pitch, and yaw is extremely sensitive to the quality of guidance. The proposed joint simulation model was almost unaffected by the lack of a radiation signal from the target and precisely followed the discretized positions and altitude, as well as the roll, pitch, and flight path angle of the 6D trajectory.
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Conference papers on the topic "Aerial yam"

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Tardiff, Marc, Luigi Cicolani, and Daniel Nyren. "Flight Evaluation of a Flexible Fabric Stabilizer for Sling Loads." In Vertical Flight Society 73rd Annual Forum & Technology Display. The Vertical Flight Society, 2017. http://dx.doi.org/10.4050/f-0073-2017-12182.

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Helicopter Sling Load is the most accurate form of aerial delivery in the military due to the ability to air land materiel in an exact location; however, some missions have a tendency for the payloads to become unstable due to both pilot-in-the-loop and aerodynamic effects. Past research demonstrated that allowing the container to rotate freely in yaw stabilizes pendulum motions. Other research utilized rigid fins affixed to the rear of the container. These methods work during tests; however, they become difficult to use in an operational environment. This paper discusses tests using a flexible fabric stabilizer that can be temporarily added to any payload. The flight tests were conducted Moffett Field, CA using the same payload as the previously mentioned research. Tests showed the flexible stabilizer provided an intermediate level of performance eliminating sling wind up and stabilizing pendulum motions out to the aircrafts’ power limit in exchange for very little operational overhead.
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Brown, Robert. "System Identification of a Free-Flying Quadrotor in a Wind Tunnel using Motion Capture Feedback." In Vertical Flight Society 80th Annual Forum & Technology Display. The Vertical Flight Society, 2024. http://dx.doi.org/10.4050/f-0080-2024-1220.

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A system identification study was conducted on a quadrotor unmanned aerial system (UAS) that was free-flying inside the test section of the Naval Surface Warfare Center Carderock Division's Subsonic Wind Tunnel. Motion capture cameras installed in the wind tunnel provided position feedback information to the aircraft in real time, enabling autonomous flights. Longitudinal, lateral, heave, and yaw axis frequency sweeps were conducted at airspeeds up to 20 knots, in 5 knot increments. The extracted flight dynamics model showed excellent agreement in both the time and frequency domains across all airspeeds. Variation in the aircraft's stability derivatives, power usage, and trim information with airspeed was determined. This paper documents the test procedures, challenges with flying aircraft inside the wind tunnel, the controller model, and the system identification results. This free-flight wind tunnel testing methodology has wide applicability to assist with UAS flight control development, and represents a new opportunity in the way traditional wind tunnels can be utilized for UAS research, development, and testing.
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Coleman, David, and Moble Benedict. "System Identification of a Hover-Capable Robotic Hummingbird." In Vertical Flight Society 72nd Annual Forum & Technology Display. The Vertical Flight Society, 2016. http://dx.doi.org/10.4050/f-0072-2016-11359.

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This paper presents the first ever linear system identification of the flight dynamics of a hover-capable robotic hummingbird which utilizes only two wings for flying as well as for all its control and stabilization. The vehicle was developed in-house, using state-of-the-art materials, electronics, and innovative design/fabrication techniques, and a description of its development is provided. Systematic experimental studies were conducted to develop flexible, aeroelastically tailored wings, along with novel wing kinematic modulation mechanisms for controlling roll, pitch and yaw. Additionally, a custom, lightweight, autopilot implementing PID control was developed, and after a series of rigorous flight testing, the trim and feedback gains were determined which allowed stable, hovering flight. Once this was achieved, a motion capture camera system was used to track the position and attitude of the vehicle during flight tests which involved providing a series of inputs to excite the vehicle modes and measuring the response. A linearized six degree of freedom state-space model for hovering flight was then extracted from this data using time domain system identification. An analysis of the eigenstate of the model reveals four modes present: an unstable mode that excites all the vehicle states; a stable mode that excites yaw and translational motion; and two oscillatory modes, one stable and one marginally unstable, both responsible for translational and rotational excitation about all axes. This finally demonstrates experimentally for the first time the unstable nature of two-winged, hover-capable flapping flight. These four modes, which show a strong coupling between the longitudinal and lateral dynamics, suggest that assumptions which decouple longitudinal and lateral degrees of freedom may not be valid for this type of flight. Additionally, this unstable, coupled dynamics demonstrates definitively the superior agility inherent in this type of aerial locomotion.
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Ezeama, C. F., E. Nwachukwu, C. J. Egbu, and M. A. Ofoeze. "Assessment of microbial profile and some physiochemical effects during fermentation and production of aerial yam (Dioscorea bulbifera) flour." In MICROBES IN APPLIED RESEARCH - Current Advances and Challenges. WORLD SCIENTIFIC, 2012. http://dx.doi.org/10.1142/9789814405041_0044.

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Dai, Jiawen, Jiaojiao Liu, Yi Yang, Jie Bai, and Zheshuo Zhang. "Fast Time-Varying Uncertainty Resisting for Hybrid UAV by Hierarchical Yaw Control with Constrained Input." In SAE 2024 Intelligent Urban Air Mobility Symposium. SAE International, 2024. http://dx.doi.org/10.4271/2024-01-7001.

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<div class="section abstract"><div class="htmlview paragraph">Yaw control for aircraft using the rudder faces challenges in resisting fast time-varying uncertainty due to the relatively slower response of the rudder. In hybrid unmanned aerial vehicles equipped with both rudders and rotors, the introduction of powered yaw control offers novel solutions for addressing fast time-varying uncertainty by leveraging the quicker response of rotors compared to traditional rudders. This paper presents a hierarchical yaw control approach for hybrid unmanned aerial vehicles, comprising a nominal control for rudders to achieve the desired yaw tracking and a constrained powered yaw control for rotors to resist fast time-varying uncertainty. Given the constrained amplitude of powered yaw control, it is imperative that the designed auxiliary input guarantees adherence to its constraint. Firstly, a nonlinear control for nominal hybrid unmanned aerial vehicle system is formulated to deal with the nonlinearity model, rendering a modest nominal control for rudders. Secondly, powered yaw control is proposed to effectively resist fast time-varying uncertainty by harnessing the faster response of rotors, while simultaneously considering the constrained amplitude of powered yaw control. Stability and robust of the hierarchical yaw control are proved under fast time-varying uncertainty and constrained powered yaw control by the Lyapunov analysis using uniform boundedness and uniform ultimate boundedness. Simulations are performed, comparing to other control methods, demonstrating the effectiveness of the proposed control method under fast time-varying uncertainty and inputs constraint.</div></div>
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6

LaRue, Robert B., Sebastian S. Thomas, Italo Costa, Weiting Liu, and Charles H. Yeo. "Dynamic Model of 25% Yak-54 Unmanned Aerial System." In AIAA Infotech @ Aerospace. American Institute of Aeronautics and Astronautics, 2016. http://dx.doi.org/10.2514/6.2016-0514.

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7

Steinmeyer, Rebecca, Nak-seung P. Hyun, E. Farrell Helbling, and Robert J. Wood. "Yaw Torque Authority for a Flapping-Wing Micro-Aerial Vehicle." In 2019 International Conference on Robotics and Automation (ICRA). IEEE, 2019. http://dx.doi.org/10.1109/icra.2019.8793873.

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8

Zhao, Bo, and Dong Yue. "Nonlinear robust attitude control development for a hexarotor unmanned aerial vehicle." In 2018 33rd Youth Academic Annual Conference of Chinese Association of Automation (YAC). IEEE, 2018. http://dx.doi.org/10.1109/yac.2018.8406370.

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9

Zhang, Dou, Guo-Ping Jiang, Ying-Jiang Zhou, You-Hong Wan, and Zhen Jia. "Fixed-time nonsingular terminal sliding mode control for unmanned aerial vehicles." In 2018 33rd Youth Academic Annual Conference of Chinese Association of Automation (YAC). IEEE, 2018. http://dx.doi.org/10.1109/yac.2018.8406375.

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10

Ali, Ussama, M. Zamurad Shah, Aamer Iqbal Bhatti, and Raza Samar. "Robust nonlinear control design for scaled Yak-54 Unmanned Aerial Vehicle." In 2014 26th Chinese Control And Decision Conference (CCDC). IEEE, 2014. http://dx.doi.org/10.1109/ccdc.2014.6852258.

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