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Journal articles on the topic 'Anglers' Attitudes'

Author: Grafiati

Published: 4 June 2021

Last updated: 6 February 2022

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1

Salz, Ronald J., and David K. Loomis. "Saltwater Anglers' Attitudes towards Marine Protected Areas." Fisheries 29, no. 6 (June 2004): 10–17. http://dx.doi.org/10.1577/1548-8446(2004)29[10:saatmp]2.0.co;2.

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2

Salz, Ronald J., and David K. Loomis. "Recreation Specialization and Anglers’ Attitudes Towards Restricted Fishing Areas." Human Dimensions of Wildlife 10, no. 3 (October 2005): 187–99. http://dx.doi.org/10.1080/10871200591003436.

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3

Boxall, Peter C., and R. LeFrancois. "Alberta anglers’ knowledge and attitudes towards bull trout and fisheries management." Human Dimensions of Wildlife 1, no. 3 (September 1996): 75–77. http://dx.doi.org/10.1080/10871209609359071.

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4

Hutt, Clifford P., and Phillip W. Bettoli. "Preferences, Specialization, and Management Attitudes of Trout Anglers Fishing in Tennessee Tailwaters." North American Journal of Fisheries Management 27, no. 4 (November 2007): 1257–67. http://dx.doi.org/10.1577/m05-215.1.

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5

Hunt, Kevin M., Myron F. Floyd, and Robert B. Ditton. "African-American and Anglo Anglers' Attitudes toward the Catch-Related Aspects of Fishing." Human Dimensions of Wildlife 12, no. 4 (August 10, 2007): 227–39. http://dx.doi.org/10.1080/10871200701442825.

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6

Schakner, Zachary, Canon Purdy, and Daniel T. Blumstein. "Contrasting attitudes and perceptions of California sea lions by recreational anglers and the media." Marine Policy 109 (November 2019): 103710. http://dx.doi.org/10.1016/j.marpol.2019.103710.

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7

Gupta, Nishikant, Shannon D. Bower, Steven J. Cooke, Andy J. Danylchuk, and Rajeev Raghavan. "Practices and attitudes of Indian catch-and-release anglers: identifying opportunities for advancing the management of recreational fisheries." Journal of Threatened Taxa 8, no. 4 (April 26, 2016): 8659. http://dx.doi.org/10.11609/jott.2410.8.4.8659-8665.

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Recreational fishing, a popular leisure activity, can potentially support conservation of species and provide socio-economic benefits to local economies. Nonetheless, there are ecological concerns regarding this pastime, especially in developing economies such as India where little information is available concerning impacts on fish populations. An online survey targeting recreational anglers practicing catch-and-release (C&R) in India (n=200) revealed 25 states/union territories as prime angling locations, with Mahseer (Tor spp.) constituting the main target species group (53%). Angling season (28%) and pristine river surroundings (14%) were stated as major factors important for angling, while overfishing (31%) and the use of illegal fishing techniques were highlighted as chief threats to fish species. Respondents were in favour of strictly adhering to C&R guidelines (23%), controlling illegal fishing techniques and pollution (18%) and spreading awareness and education among local stakeholders (18%) to protect fish. Over 75% of respondents were also willing to contribute both their time and money to conservation initiatives focusing on key sport fish. With anglers targeting multiple fishing locations throughout India, there is a need for consistent governance structures and policy instruments to support the development of sustainable recreational fisheries while minimising conflict with other stakeholder groups. The impacts of C&R fisheries interactions on individuals and populations (especially for threatened species) need to be studied in the Indian context. Direct participation by recreational anglers in C&R research could strengthen broader conservation and management initiatives throughout the country by increasing stewardship.

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Roop, Hunter J., Neelam C. Poudyal, and Cecil A. Jennings. "Fishing preferences, angling behavior, and attitudes toward management: a comparison between White and Nonwhite anglers." Human Dimensions of Wildlife 26, no. 1 (July 18, 2020): 84–89. http://dx.doi.org/10.1080/10871209.2020.1794082.

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9

van den Heuvel, Lotte, Malgorzata Blicharska, Samuel Blyth, and Patrik Rönnbäck. "Catch reporting in recreational fishing: Swedish anglers’ attitudes and preferences, and the effect of social factors." Fisheries Research 223 (March 2020): 105444. http://dx.doi.org/10.1016/j.fishres.2019.105444.

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10

Wilde, Gene R., Robin K. Riechers, and Robert B. Ditton. "Differences in Attitudes, Fishing Motives, and Demographic Characteristics between Tournament and Nontournament Black Bass Anglers in Texas." North American Journal of Fisheries Management 18, no. 2 (May 1998): 422–31. http://dx.doi.org/10.1577/1548-8675(1998)018<0422:diafma>2.0.co;2.

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11

Lewin, Wolf-Christian, Marc Simon Weltersbach, Gloria Denfeld, and Harry V. Strehlow. "Recreational anglers’ perceptions, attitudes and estimated contribution to angling related marine litter in the German Baltic Sea." Journal of Environmental Management 272 (October 2020): 111062. http://dx.doi.org/10.1016/j.jenvman.2020.111062.

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12

Nguyen, Vivian M., Murray A. Rudd, Scott G. Hinch, and Steven J. Cooke. "Recreational anglers' attitudes, beliefs, and behaviors related to catch-and-release practices of Pacific salmon in British Columbia." Journal of Environmental Management 128 (October 2013): 852–65. http://dx.doi.org/10.1016/j.jenvman.2013.06.010.

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13

Gupta, Nishikant, Rajeev Raghavan, Kuppusamy Sivakumar, Vinod Mathur, and Adrian C. Pinder. "Assessing recreational fisheries in an emerging economy: Knowledge, perceptions and attitudes of catch-and-release anglers in India." Fisheries Research 165 (May 2015): 79–84. http://dx.doi.org/10.1016/j.fishres.2015.01.004.

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14

Donaldson, M. R., G. D. Raby, V. N. Nguyen, S. G. Hinch, D. A. Patterson, A. P. Farrell, M. A. Rudd, et al. "Evaluation of a simple technique for recovering fish from capture stress: integrating physiology, biotelemetry, and social science to solve a conservation problem." Canadian Journal of Fisheries and Aquatic Sciences 70, no. 1 (January 2013): 90–100. http://dx.doi.org/10.1139/cjfas-2012-0218.

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We evaluate the utility of an inexpensive, portable recovery bag designed to facilitate recovery of fish from capture stress by combining physiological assays, biotelemetry, and social science surveys. Adult migrating Pacific salmon (Oncorhynchus spp.) were used as a model, since some of their populations are threatened. While catch-and-release is common, there is a need to ensure that it is sustainable. A social science survey revealed that anglers generally have positive attitudes towards recovery bag use, particularly if research identifies that such techniques could be effective. Physiological assays on pink salmon (Oncorhynchus gorbuscha) revealed benefits of both high- and low-velocity recovery, but high velocity was most effective with reduced plasma cortisol concentrations and similar plasma sodium and chloride concentrations as those found in controls at all recovery durations. A biotelemetry study on sockeye salmon (Oncorhynchus nerka) captured by anglers and stressed by air exposure then placed in recovery bags had 20% higher, but not significantly different, survival than no-recovery salmon. The integration of natural science and social science provides an important step forward in developing methods for promoting recovery of fish from capture.

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15

Kramer, RW, BQ Mann, SW Dunlop, JB Mann-Lang, and D. Robertson-Andersson. "Changes in recreational shore anglers’ attitudes towards, and awareness of, linefish management along the KwaZulu-Natal coast, South Africa." African Journal of Marine Science 39, no. 3 (October 25, 2017): 327–37. http://dx.doi.org/10.2989/1814232x.2017.1373704.

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16

Mason, Erica T., Allison N. Kellum, Jennifer A. Chiu, Grant T. Waltz, Samantha Murray, Dean E. Wendt, Richard M. Starr, and Brice X. Semmens. "Long-term participation in collaborative fisheries research improves angler opinions on marine protected areas." PeerJ 8 (October 28, 2020): e10146. http://dx.doi.org/10.7717/peerj.10146.

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Recent marine spatial planning efforts, including the management and monitoring of marine protected areas (MPAs), increasingly focus on the importance of stakeholder engagement. For nearly 15 years, the California Collaborative Fisheries Research Program (CCFRP) has partnered volunteer anglers with researchers, the fishing industry, and resource managers to monitor groundfishes in California’s network of MPAs. While the program has succeeded in generating sustained biological observations, we know little about volunteer angler demography or the impact of participation on their perceptions and opinions on fisheries data or MPAs. In this study we surveyed CCFRP volunteers to learn about (a) volunteer angler demographics and attitudes toward groundfish management and stock health, (b) volunteer angler motivations for joining and staying in the program, and (c) whether participation in the program influenced volunteer angler opinions on the quality of fisheries data used in resource management and the establishment of MPAs in California. CCFRP volunteers were older and had higher fishing avidity than average within the California recreational angling community. Many self-identified as more conservation-minded than their peers in the recreational fishing community and had positive views of California groundfish management and stock health. Participation in science and giving back to fisheries resources were major motivating factors in their decision to become and remain CCFRP volunteers. Angler opinions toward MPAs were more positive after volunteering with CCFRP. Those who had volunteered for seven or more years with CCFRP were more likely than not to gain a positive opinion of MPAs. Our survey results provide evidence that long-term engagement of stakeholders in collaborative research positively influences stakeholder opinions regarding marine resource management, and highlights CCFRP’s success in engaging citizen science stakeholders in collaborative fisheries research.

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17

Gigliotti, Larry M., and R. Ben Peyton. "Values and Behaviors of Trout Anglers, and their Attitudes toward Fishery Management, Relative to Membership in Fishing Organizations: A Michigan Case Study." North American Journal of Fisheries Management 13, no. 3 (August 1993): 492–501. http://dx.doi.org/10.1577/1548-8675(1993)013<0492:vabota>2.3.co;2.

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18

Dorow, Malte, and Robert Arlinghaus. "The Relationship between Personal Commitment to Angling and the Opinions and Attitudes of German Anglers towards the Conservation and Management of the European EelAnguilla anguilla." North American Journal of Fisheries Management 32, no. 3 (June 2012): 466–79. http://dx.doi.org/10.1080/02755947.2012.680006.

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19

Zenyuh, John P., John M. Reising, James E. McClain, Diana J. Barbato, and David C. Hartsock. "Advanced Head-Up Display (HUD) Symbology: Aiding Unusual Attitude Recovery." Proceedings of the Human Factors Society Annual Meeting 31, no. 9 (September 1987): 1067–71. http://dx.doi.org/10.1177/154193128703100932.

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The head-up displays (HUD's) of today's fighter aircraft present numerous symbology formats to the pilot which are essential for successful perfomance of a variety of flight tasks from navigation to weapons delivery. One common element in all of these formats is the pitch ladder, designed to provide the pilot with aircraft attitude even in the absence of external visual cues. Unlike the head down attitude director indicator (ADI), the HUD pitch ladder's intent is to aid the pilot in recovering from an unusual attitude while staying head-up. The purpose of this research was to compare the relative effectiveness of two changes to current pitch ladder symbology designed to enhance the pilot's ability to recover from unusual attitudes –the use of angled pitch bars versus standard straight pitch bars, and multicolor versus the standard monochromatic symbology. The results showed that, in extreme unusual attitudes, the use of both the angled pitch bars and color contributed to better flight performance. In the non-extreme attitudes however, where the horizon line is always visible, the standard symbology was sufficient for recovery.

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20

Huang, Yu, Lihua Wu, and Dequan Li. "Theoretical Research on Full Attitude Determination Using Geomagnetic Gradient Tensor." Journal of Navigation 68, no. 5 (April 17, 2015): 951–61. http://dx.doi.org/10.1017/s0373463315000259.

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To solve the problem of attitude determination using magnetometers independently and uniquely, which is important for underwater vehicles, a type of full attitude determination method based on geomagnetic gradient tensor is proposed in this paper. In this method, a group of non-linear equations concerning geomagnetic gradient tensors is established, where a quaternion is selected to calculate three attitude angles of an underwater vehicle. The optimal quaternion is estimated using Newton Down-hill to optimise the object function. The detailed steps of the full attitude determination based on geomagnetic gradient tensor are given, and the effects of the initial angle error and the sensor noise on the attitude determination are investigated. Simulations show that the algorithm can identify precisely and quickly the attitudes even in the presence of larger initial angle error and sensor noise, which proves the attitude determination algorithm.

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21

Liu, Zengjun, Lei Wang, Wei Wang, and Tianxiao Song. "A self-calibration method for non-orthogonal angles of gimbals in rotational inertial navigation system based on fiber optic gyro." Transactions of the Institute of Measurement and Control 40, no. 13 (October 9, 2017): 3665–74. http://dx.doi.org/10.1177/0142331217729203.

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Rotating modulation technique is a mature method that has been widely used in the rotational inertial navigation system (RINS). Tri-axis RINS has three gimbals, and the Inertial Measurement Unit can rotate along three directions to modulate the inertial devices’ errors, so that the navigation accuracy of the system can be greatly improved. However, the outputs of attitudes are easily affected by the non-orthogonal angles of gimbals, which should be accurately calibrated and compensated. In this paper, the effects of the non-orthogonal angles on the attitudes are discussed detailed and simulations based on Matlab are conducted to verify that firstly; then, a self-calibration method based on the outputs of the fiber optic gyroscope and photoelectric encoder is proposed. Experimental results in a real tri-axis RINS show that the attitude outputs accuracy are improved from 150” to less than 10”, which verify the practicability of the calibration method proposed in this paper.

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22

Starets, Moshé. "Attitudes des élèves acadiens néo-écossais à l’égard du français et de l’anglais." Revue des sciences de l'éducation 16, no. 1 (November 19, 2009): 55–75. http://dx.doi.org/10.7202/900651ar.

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Les études de Gardner et Lambert (1959), Taylor et Simard (1975), Clément et Hamers (1979) ainsi que d’autres chercheurs ont démontré que l’acquisition d’une langue seconde est influencée, entre autres, par les attitudes affectives et pragmatiques et matérielles de l’élève envers une langue. Ils suggèrent que ces deux types d’attitudes peuvent influencer la motivation de l’étudiant à apprendre une langue seconde. Dans une recherche menée auprès d’élèves acadiens néo-écossais, nous avons démontré que leurs attitudes affectives envers les deux langues sont très positives, qu’elles favorisent le français, alors que leurs attitudes pragmatiques et matérielles toutefois favorisent l’anglais. Ces attitudes linguistiques pragmatiques peuvent s’expliquer par le fait que les Acadiens vivent dans une province où toutes les activités économiques se déroulent en anglais. Cette attitude pragmatique et matérielle se reflète aussi dans leurs opinions sur l’orientation linguistique que l’on doit donner au réseau scolaire acadien de la province (l’École acadienne) : de l’avis de ces élèves, l’École acadienne doit maintenir une présence et une ambiance françaises, mais les matières qui sont perçues comme menant vers une carrière (les matières scientifiques) doivent s’y enseigner en anglais.

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23

Parvez, S. A. "Attitude determination using antenna polarization angles." Journal of Guidance, Control, and Dynamics 14, no. 2 (March 1991): 236–40. http://dx.doi.org/10.2514/3.20633.

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24

Dong, Yiqun, Youmin Zhang, and Jianliang Ai. "Full-altitude attitude angles envelope and model predictive control-based attitude angles protection for civil aircraft." Aerospace Science and Technology 55 (August 2016): 292–306. http://dx.doi.org/10.1016/j.ast.2016.06.006.

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25

Zhuang, Zhemin, Zhijie Guo, Alex Noel Joseph Raj, and Canzhu Guo. "UAV attitude estimation based on the dual filtering methods." International Journal of Intelligent Unmanned Systems 6, no. 1 (January 2, 2018): 21–31. http://dx.doi.org/10.1108/ijius-09-2017-0010.

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Purpose A toy UAV performs tumbling, rolling, racing and other complex activities. It is based on low-cost hardware and hence requires a better algorithm to estimate the attitudes more accurately with low power consumption. The proposed technique based on optimized Madgwick filter and moving average filter (MAF) ensures improved convergence speed in estimating the attitude, achieves higher accuracy and provides robustness and stability of the toy UAV. The paper aims to discuss this issue. Design/methodology/approach Traditional methods are prone to problems such as slow convergence speed and errors in calculation of the attitude angles. These errors cause the vehicle to drift and tremble, thus affecting the overall stability of the vehicle. The proposed method combines the features of optimized Madgwick filter and MAF to provide better accuracy, achieved through the fusion of gyroscope and accelerometer data, and zero correction to eliminate the random drift error of the gyroscope and removal of high-frequency interference by MAF of the accelerometer data. The experimental results on actual flight data showed that the method was better than the conventional Madgwick and Mahony complementary filters. Findings The performance of the proposed method was analyzed by estimating the pitch and roll angles under the static and dynamic condition of the toy UAV. The results were compared with two traditional methods: Madgwick and Mahony complement filter. In the static condition, the variance and average error while estimating the attitudes was comparatively lower than the traditional method. For the dynamic conditions, the convergence time to achieve a prescribed swing angle was again lower than the traditional method. From these two experiments, it can be seen that the proposed method provides better attitude estimation at lower computation time. Originality/value The proposed method combines the optimized Madgwick filter and MAF to accuracy estimate the attitude of toy UAV. The algorithm mainly suits the toy UAVs which are based on low-cost hardware and require better control systems to ensure stability of the vehicle. The experimental results on real flight data illustrate that the method not only improves the convergence speed in estimating the attitude angle for large maneuvers of the toy UAV, but also achieves higher accuracy in the attitude estimation, thus ensuring the robustness and stability of the UAV.

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26

Hua, Ming, Kui Li, Yanhong Lv, and Qi Wu. "A Dynamic Calibration Method of Installation Misalignment Angles between Two Inertial Navigation Systems." Sensors 18, no. 9 (September 4, 2018): 2947. http://dx.doi.org/10.3390/s18092947.

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Generally, in order to ensure the reliability of Navigation system, vehicles are usually equipped with two or more sets of inertial navigation systems (INSs). Fusion of navigation measurement information from different sets of INSs can improve the accuracy of autonomous navigation effectively. However, due to the existence of misalignment angles, the coordinate axes of different systems are usually not in coincidence with each other absolutely, which would lead to serious problems when integrating the attitudes information. Therefore, it is necessary to precisely calibrate and compensate the misalignment angles between different systems. In this paper, a dynamic calibration method of misalignment angles between two systems was proposed. This method uses the speed and attitude information of two sets of INSs during the movement of the vehicle as measurements to dynamically calibrate the misalignment angles of two systems without additional information sources or other external measuring equipment, such as turntable. A mathematical model of misalignment angles between two INSs was established. The simulation experiment and the INSs vehicle experiments were conducted to verify the effectiveness of the method. The results show that the calibration accuracy of misalignment angles between the two sets of systems can reach to 1″ while using the proposed method.

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27

Triantafyllou, T., T. Nikolaidis, M. Diakostefanis, and P. Pilidis. "Stability assessment of an airflow distorted military engine’s FAN." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 232, no. 13 (June 27, 2017): 2584–92. http://dx.doi.org/10.1177/0954410017716478.

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Military aircraft are often subjected to severe flight maneuvers with high angles of attack and angles of sideslip. These flight attitudes induce non-uniformity in flow conditions to their gas turbine engines, which may include distortion of inlet total pressure and total temperature at the aerodynamic interface plane. Operation of the downstream engine’s compression system may suffer reduced aerodynamic performance and stall margin, and increased blade stress levels. The present study presents a methodology of evaluating the effect of inlet flow distortion on the engine’s fan stability. The flow distortion examined was induced to the aerodynamic interface plane by means of changing the aircraft’s flight attitude. The study is based on the steady-state flow results from 27 different flight scenarios that have been simulated in computational fluid dynamics. As a baseline model geometry, an airframe inspired by the General Dynamics/LMAERO F-16 aircraft was chosen, which has been exposed to subsonic incoming airflow with varying direction resembling thus different aircraft flight attitudes. The results are focused on the total pressure distribution on the engine’s (aerodynamic interface plane) face and how this is manifested at the operation of the fan. Based on the results, it was concluded that the distorted conditions cause a shift of the surge line on the fan map, with the amount of shift to be directly related to the severity of these distorted conditions. The most severe flight attitude in terms of total pressure distortion, among the tested ones, caused about 7% surge margin depletion comparing to the undistorted value.

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28

Triantafyllou, T., T. Nikolaidis, M. Diakostefanis, and P. Pilidis. "Total pressure distortion levels at the aerodynamic interface plane of a military aircraft." Aeronautical Journal 119, no. 1219 (September 2015): 1147–66. http://dx.doi.org/10.1017/s0001924000011179.

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AbstractMilitary aircrafts are often subjected to severe flight maneuvers with high Angles-of -Attack (AOA) and Angles of Sideslip (AOSS). These flight attitudes induce non-uniform in flow conditions to their gas turbine engines which may include distortion of inlet total pressure and total temperature at the Aerodynamic Interface Plane (AIP). Operation of the downstream compression system with distorted inflow typically results in reduced aerodynamic performance, reduced stall margin, and increased blade stress levels. In the present study the steady state total pressure distortion induced to the Aerodynamic Interface Plane due to the aircraft’s flight attitude have been estimated in terms of distortion descriptors. The distorted conditions at the interface between the intake and the engine have been predicted by using Computational Fluid Dynamics (CFD), where 33 different aircraft flight attitudes have been tested. Based on the obtained results the effect of Angle-of-Attack (AOA) and Angle of Side Slip (AOSS) on the distortion descriptors have been studied. The results showed that the distortion effect becomes more pronounced whenever this specific airframe configuration is exposed to incoming flow with an AOSS. Among the tested cases, the greatest total pressure defect at the AIP in terms of difference from the average value and of circumferential extent was calculated for the flight attitudes of 0·35M flight with 0° AOA and 8° AOSS and 0·35M fight with 16° AOA and 16° AOSS.

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29

Anderson, David K., Robert B. Ditton, and Kevin M. Hunt. "Measuring Angler Attitudes Toward Catch-Related Aspects of Fishing." Human Dimensions of Wildlife 12, no. 3 (June 4, 2007): 181–91. http://dx.doi.org/10.1080/10871200701323066.

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30

Murphy, Robert, Steven Scyphers, Steven Gray, and Jonathan H. Grabowski. "Angler Attitudes Explain Disparate Behavioral Reactions to Fishery Regulations." Fisheries 44, no. 10 (June 19, 2019): 475–87. http://dx.doi.org/10.1002/fsh.10286.

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31

Gao, Ming, Genyou Liu, Shengliang Wang, Gongwei Xiao, Wenhao Zhao, and Dong Lv. "Research on Tightly Coupled Multi-Antenna GNSS/MEMS Single-Frequency Single-Epoch Attitude Determination in Urban Environment." Remote Sensing 13, no. 14 (July 9, 2021): 2710. http://dx.doi.org/10.3390/rs13142710.

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GNSS-only attitude determination is difficult to perform well in poor-satellite-tracking environments such as urban areas with high and dense buildings or trees. In addition, it is harder to resolve integer ambiguity in the case of single-frequency single-epoch process mode. In this contribution, a low-cost MEMS gyroscope is integrated with multi-antenna GNSS to improve the performance of the attitude determination. A new tightly coupled (TC) model is proposed, which uses a single filter to achieve the optimal estimation of attitude drift, gyro biases and ambiguities. In addition, a MEMS-Attitude-aided Quality-Control method (MAQC) for GNSS observations is designed to eliminate both the carrier multipath errors and half-cycle slips disturbing ambiguity resolution. Vehicle experiments show that in GNSS-friendly scenarios, the Ambiguity Resolution (AR) success rate of the proposed model with MAQC can reach 100%, and the accuracy of attitudes are (0.12, 0.2, 0.2) degrees for heading, pitch and roll angles, respectively. Even in harsh scenarios, the AR success rate increases from about 67% for the GNSS only case to above 90% after coupling GNSS tightly with MEMS, and it is further improved to about 98% with MAQC. Meanwhile, the accuracy and continuity of attitude determination are effectively guaranteed.

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32

Niu, Chun Feng, Shi Ping Liu, and Zhong Yuan Wang. "Estimate of Flying Projectile Attitude Based on MEMS Gyroscope Measurements." Applied Mechanics and Materials 236-237 (November 2012): 236–41. http://dx.doi.org/10.4028/www.scientific.net/amm.236-237.236.

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To estimate the flight attitude angles of Guided Projectile rapidly and accurately to realize the precise control, angular motion equations and MEMS gyroscope measurements were used to build the state equation and the measurement equationcombined withthe ballistic priori knowledge. Based on the unscented kalman filter for nonlinear system, an approach of estimating the attitude angles of Guided Projectile was proposed. Taking a certain type of Guided Projectile as an example, the data of triaxial angular velocities with the measurement noise was considered as the output signal of MEMS gyros, and considered the calculated ballistic data as the ballistic priori knowledge. Through the approach proposed in this paper, the above were used to obtain the estimates for attitude angles. The results indicate that, it’s feasible to obtain the attitude angles by angular motion equations and gyros. On account of the actual random noise signal of gyros, the accuracy of the estimated attitude angles can meet the requirement of trajectory control system for Guided Projectile.

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33

Garlock, T. M., and K. Lorenzen. "Marine angler characteristics and attitudes toward stock enhancement in Florida." Fisheries Research 186 (February 2017): 439–45. http://dx.doi.org/10.1016/j.fishres.2016.08.017.

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34

Zhang, Jin, Lijun Ren, Huaxia Deng, Mengchao Ma, Xiang Zhong, and Pengcheng Wen. "Measurement of Unmanned Aerial Vehicle Attitude Angles Based on a Single Captured Image." Sensors 18, no. 8 (August 13, 2018): 2655. http://dx.doi.org/10.3390/s18082655.

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The limited load capacity and power resources of small-scale fixed-wing drones mean that it is difficult to employ internal high-precision inertial navigation devices to assist with the landing procedure. As an alternative, this paper proposes an attitude measurement system based on a monocular camera. The attitude angles are obtained from a single captured image containing five coded landmark points using the radial constraint method and three-dimensional coordinate transformations. The landing procedure is simulated for pitch angles from −15 ∘ to −40 ∘ , roll angles from −15 ∘ to +15 ∘ and yaw angles from −15 ∘ to +15 ∘ . For roll and pitch angles of approximately 0 ∘ and −25 ∘ , respectively, the accuracy of the method reaches 0.01 ∘ and 0.04 ∘ . This UAV attitude measurement system obtains an attitude angle by a single captured image, which has great potential for assisting with the landing of small-scale fixed-wing UAVs.

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35

Liu, Jie, Li Bin Du, Hai Jing He, and Zhuo Lei. "Attitude Stability Analysis of Expendable BathyThermograph." Advanced Materials Research 834-836 (October 2013): 1535–39. http://dx.doi.org/10.4028/www.scientific.net/amr.834-836.1535.

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In this paper, the hydrodynamic properties of expendable bathy thermograph (XBT) is analyzed and got the changes of lift coefficient and drag coefficient with the attack angles change. We research the pressure field profile outside of XBT with different attack angles and analyze the reasons which can affect the stability of XBT. The research can provide reference for further optimization of the probe structure and stability test of XBT.

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Wu, Bin, Peng Chen, Yong Jiang Hu, and Chang Long Wang. "Research on Attitude Singularity Problem of Small Tail-Sitter Aircraft." Applied Mechanics and Materials 599-601 (August 2014): 401–4. http://dx.doi.org/10.4028/www.scientific.net/amm.599-601.401.

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Singularity problem in attitude estimation of small tail-sitter aircraft with traditional algorithm is researched. According to the flight characteristics of small tail-sitter aircraft, a new algorithm is proposed. Vertical Euler angles whose singularity points are away from standard Euler angles are introduced. Only one set of angles are used in horizontal or near-vertical state to avoid singularity. Simulation results show that attitude angles can vary continuously and have high accuracy under the condition of a large tilting angle.

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Sun, Xiu Jun, Jian Shi, and Yan Yang. "Neural Networks Based Attitude Decoupling Control for AUV with X-Shaped Fins." Advanced Materials Research 819 (September 2013): 222–28. http://dx.doi.org/10.4028/www.scientific.net/amr.819.222.

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Attitude control in three-dimensional space for AUV (autonomous underwater vehicle) with x-shaped fins is complicated but advantageous. Yaw, pitch and roll angles of the vehicle are all associated with deflection angle of each fin while navigating underwater. In this paper, a spatial motion mathematic model of the vehicle is built by using theorem of momentum and angular momentum, and the hydrodynamic forces acting on x-shaped fins and three-blade propeller are investigated to clarify complex principle of the vehicle motion. In addition, the nonlinear dynamics equation which indicates the coupling relationship between attitude angles of vehicle and rotation angles of x-shaped fins is derived by detailed deduction. Moreover, a decoupling controller based on artificial neural networks is developed to address the coupling issue exposed in attitude control. The neural networks based controller periodically calculates and outputs deflection angles of fins according to the attitude angles measured with magnetic compass, thus the vehicles orientation can be maintained. By on-line training, twenty four weights in this controller converged according to index function.

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Hutt, Clifford P., Kevin M. Hunt, J. Warren Schlechte, and David L. Buckmeier. "Effects of Catfish Angler Catch-Related Attitudes on Fishing Trip Preferences." North American Journal of Fisheries Management 33, no. 5 (October 2013): 965–76. http://dx.doi.org/10.1080/02755947.2013.822443.

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Sun, Xiu Jun, and Yan Yang. "Longitudinal Control for AUV with Self-Adaptive Learning Law." Advanced Materials Research 819 (September 2013): 259–65. http://dx.doi.org/10.4028/www.scientific.net/amr.819.259.

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A mini AUV (Autonomous Underwater Vehicle) with cross shaped rudders and one single thruster is presented, which features high maneuverability due to the intelligent control algorithm. A single variable PID neural network controller is also proposed, which is utilized to maintain attitude for the vehicle. In order to testify feasibility of the control methodology, a spatial motion mathematic model is constructed and linear equations that indicate the relation between attitude angles of vehicle and deflection angles of rudders is deduced firstly. Subsequently, the neural network PID controller is developed according to the deduced equations and the attitude control simulation of the vehicle with this controller is conducted. Taking actual and desired attitude angles of the vehicle as input and deflection angles of the rudders as output, this controller performs self-adaptive update for 9 synaptic weights through back-propagation algorithm and employs the converged weights to calculate the appropriate deflection angle of each rudder.

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Hidayati, Nur, and Joko Siswanto. "Profil Berpikir Kreatif Melalui Project Based Learning Bermuatan ESD pada Konsep Sel Siswa Kelas XI MIPA SMAN 1 Bantarbolang." Media Penelitian Pendidikan : Jurnal Penelitian dalam Bidang Pendidikan dan Pengajaran 14, no. 1 (June 25, 2020): 1–5. http://dx.doi.org/10.26877/mpp.v14i1.5519.

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Creative thinking is one of the 21st century skills. The development of creative thinking skills can be done using a learning model Project Based Learning (PjBL). The development of the model PjBL charged ESD (Education For Sustainable Development) aims to explore the potential of creativity and to instill awareness and concern for the environment for sustainable development. Research samples students of class XI MIPA SMAN 1 Bantarbolang. This research is a descriptive research with quantitative methods conducted by administering the test related creative thinking skills and attitudes of creativity of the students. The instrument tests the ability of creative thinking developed in the form of a description with the indicators of fluency, flexibility, originality and elaboration. Instruments creative attitude of students consists of multiple choice questions which includes the attitude indicator creative thinking skills students are curious, imaginative, and original in the expression of ideas, freely expressed opinions and see the issue from various angles. The results showed that the ability of creative thinking of students in the concept of the cell as much as 10% of students already have the ability to think creatively, while 83% of students have the ability of creative thinking are and 7% of students have the ability to think low. The results of the questionnaire showed 23% of students have an attitude of creative high, while the other is respectively as much as 53% of students have an attitude of creative medium and 23% of other students still have a low creative attitude.

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Garcia, Roberta Veloso, Helio Koiti Kuga, and Maria Cecilia F. P. S. Zanardi. "Unscented Kalman Filter Applied to the Spacecraft Attitude Estimation with Euler Angles." Mathematical Problems in Engineering 2012 (2012): 1–12. http://dx.doi.org/10.1155/2012/985429.

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The aim of this work is to test an algorithm to estimate, in real time, the attitude of an artificial satellite using real data supplied by attitude sensors that are on board of the CBERS-2 satellite (China Brazil Earth Resources Satellite). The real-time estimator used in this work for attitude determination is the Unscented Kalman Filter. This filter is a new alternative to the extended Kalman filter usually applied to the estimation and control problems of attitude and orbit. This algorithm is capable of carrying out estimation of the states of nonlinear systems, without the necessity of linearization of the nonlinear functions present in the model. This estimation is possible due to a transformation that generates a set of vectors that, suffering a nonlinear transformation, preserves the same mean and covariance of the random variables before the transformation. The performance will be evaluated and analyzed through the comparison between the Unscented Kalman filter and the extended Kalman filter results, by using real onboard data.

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XUE Le-tang, 薛乐堂, 陈. 涛. CHEN Tao, 徐. 涛. XU Tao, 刘廷霞 LIU Ting-xia, and 李. 博. LI Bo. "High-precision calculation for attitude angles of fast steering mirror." Optics and Precision Engineering 24, no. 8 (2016): 2000–2009. http://dx.doi.org/10.3788/ope.20162408.2000.

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Fang, Xuan, Bocheng Zhong, and Xingtao Ding. "An Analysis System for Attitude Angles of Four-rotor Aircrafts." International Journal of Computer Applications 149, no. 3 (September 15, 2016): 41–45. http://dx.doi.org/10.5120/ijca2016911375.

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Li, Junjie, Yunfeng Lou, Gaoyuan Yu, Tong Li, and Xianlong Jin. "Effect of Bird Yaw/Pitch Angles on Soft Impact Damage of a Fan Assembly." Complexity 2021 (January 16, 2021): 1–13. http://dx.doi.org/10.1155/2021/8879874.

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This paper presents a numerical investigation of bird attitude angles affecting the soft-impact damage of a full fan assembly. Firstly, considering the geometry of a mallard, a real bird model is established by the Smoothed Particle Hydrodynamics (SPH) method and calibrated with available test data. Then, complying with airworthiness requirements, simulations of a full-bladed fan assembly subjected to a real bird were conducted to determine the critical ingestion parameters (CIP). Furthermore, a real bird with different attitude angles aimed at a full fan assembly was simulated. Results show that attitude angles of the bird produce a significant impact on the effect of the bird strike on rotating blades and would increase the possibility of blade failures, especially for the yaw angle of -45° and the pitch angle of −60°. It is invaluable for commercial airlines and engine manufactures to provide safe flight and landing by adopting the real bird model with critical yaw and pitch angles in the design for resistance to bird ingestion.

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Cheng, Jianhua, Jing Wang, and Lin Zhao. "A Direct Attitude Determination Approach Based on GPS Double-Difference Carrier Phase Measurements." Journal of Applied Mathematics 2014 (2014): 1–6. http://dx.doi.org/10.1155/2014/548083.

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The principle of the traditional attitude solution approach based on GPS (Global Position System) is to get the attitude matrix according to the relationship of coordinates. During the progress, the error of baseline position assumed in ECEF (Earth-Centered Earth-Fixed) and the error of coordinate transform between body frame and reference frame (ENU, East-North-Up) have been included in the result, and finally the precision of attitude determination is reduced. This contribution presents a new approach of attitude determination, in which the attitude angles are calculated by the double-difference carrier phase equation of GPS according to the relationship of attitude matrix and attitude angles through least-squares estimate method. The new approach predigests the procedure of attitude determination which reduces the error assumed. According to the analysis the precision of attitude determination is higher than that of traditional method. It is shown it gets a precise attitude result with the direct attitude determination method in the simulation. A novel algorithm is proposed to solve some problems. Simulation results show the effectiveness of the proposed algorithm.

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Zhang, S., H. Jiang, H. Gu, X. Chen, and S. Liu. "REMOTE ATTITUDE SENSING BASED ON HIGH-SPEED MUELLER MATRIX ELLIPSOMETRY." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLIII-B1-2020 (August 6, 2020): 607–14. http://dx.doi.org/10.5194/isprs-archives-xliii-b1-2020-607-2020.

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Abstract. The attitude metrology of moving objects has always been a hot topic in engineering applications. In this article, a novel optical method based on the high-speed Mueller matrix ellipsometry (MME) is proposed for real-time remote attitude sensing. With the help of an electric level, all the attitude angles of a free-moving object with a birefringent waveplate attached can be simultaneously extracted in real time. Compared with existing ellipsometry-based attitude metrology that can only be used in the transmission mode, the proposed method with the advantages of the high-speed MME can expand the application to both the transmission and reflection modes while maintaining higher accuracy and robustness in an ultra-large measurement range. The basic principle is presented via theoretical derivation, and the change in the Mueller matrix of the birefringent waveplate versus the attitude angles is explored in the simulated experiments. In a series of the dynamic experiments, with the extremely high temporal resolution and accuracy of the high-speed MME, an angular resolution up to 0.00022° and an angular accuracy better than 0.01° are achieved in the real-time attitude tracking of the free-moving object. As an additional benefit, the real-time angular velocity and acceleration of all the attitude angles can be obtained simultaneously. These experimental results demonstrate that the proposed attitude metrology is ready to be applied to the real-time remote attitude sensing with high angular resolution and accuracy.

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Cui, Kai, Zhao Hui Liu, Zhi Guo Li, Hui Yuan, and Dong Sheng Liang. "Simulation of the Space Turntable Angular Velocity Measurement." Applied Mechanics and Materials 246-247 (December 2012): 257–61. http://dx.doi.org/10.4028/www.scientific.net/amm.246-247.257.

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For better design and control of the space turntable, a model for measuring its angular velocity was built. The model utilized a two-axis space turntable to perform the simulation basing on the coordinate conversion theory. The measuring simulation went on with the help of MATLAB software using different carrier attitude angles. It shows the maximal error in the sub astral point longitude and/or latitude is 0.00785 degrees when comparing with the STK results, certifying the validity of the models. The satellite attitude angles have influence on the angular velocity, the maximal azimuth angular velocity is 3.784 deg per sec, yet the elevation's is 0.6945 deg per sec when the attitude angles are all 20 degrees. This simulation process provides some guidance for designing, controlling and calibrating the space turntable.

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Li, Xiuzhong, Yijun He, Biao Zhang, and Chenqing Fan. "The Construction of a Three-Dimensional Antenna Gain Matrix and Its Impact on Retrieving Sea Surface Mean Square Slope Based on Aircraft Wave Spectrometer Data." Journal of Atmospheric and Oceanic Technology 33, no. 4 (April 2016): 847–56. http://dx.doi.org/10.1175/jtech-d-15-0095.1.

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AbstractIn this study, a rotating frequency-modulated continuous wave (FMCW) radar is installed on an aircraft to retrieve the sea wave spectra. Because the aircraft attitude angles produce the incorrect antenna gain used in the radar equation, the incorrect normalized radar cross section (NRCS) of the sea surface will be acquired. To eliminate the effect of the angles, a three-dimensional matrix of the radar antenna gain is constructed by means of coordinate transformation and interpolation, based on a large set of configurations of the aircraft attitude angles (roll, pitch, etc.). With the application of the matrix, the NRCS of the sea surface is corrected and the calculating time is reduced. Then the sea surface mean square slope (MSS) is obtained from the echoes of the airborne wave spectrometer. Considering a weak periodicity of MSS due to low sea state, four images are presented to show the variation of the MSS after aircraft attitude angle correction. The results indicate that the accurate incidence angle of the antenna beam center is critical for retrieving the sea surface MSS, and that the magnitude of the MSS from three cycles of radar echoes can be changed by as much as 40% within 5° of the attitude angles. Furthermore, the MSS becomes more periodic and regular after correction.

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Dong, Yi Qun, Li Dong Zhang, Yi Jun Zhang, and Jian Liang Ai. "Attitude Protection Control for Side Stick-Operated Aircraft." Advanced Materials Research 846-847 (November 2013): 77–85. http://dx.doi.org/10.4028/www.scientific.net/amr.846-847.77.

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A control framework to limit aircraft Euler angles (pitch/rolling) under adverse side stick command adding is introduced. Attitude envelope of the aircraft pitch/rolling angle is discussed based on geometrical position of the aircraft relative to the ground. Control law of is established by using linearized predictive control strategy. The simulation test presents the performance of attitude protection restricting the Euler angles within the required envelop at 1,000m. Based on the test work discussed herein, the control work proposed in this paper is believed to be applicable.

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Allen, Natasha Danae. "Utilizing discovery tools for classrooms: how do librarian attitudes on discovery impact tools they teach?" Library Hi Tech News 32, no. 1 (March 2, 2015): 8–12. http://dx.doi.org/10.1108/lhtn-09-2014-0078.

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Purpose – The purpose of this paper is to examine the utilization of discovery tools in classrooms with the aim of trying to assess the attitude toward them. Design/methodology/approach – The methodology adopted in this article is a literature review. Findings – Despite the author's best efforts to look at the data from all angles, the author found no statistical significance in any of the data pulled from the survey. The author also tested to see if personal preference had any bearing on reference preference and found that there was no statistical significance between personal preference and reference preference. The author removed all responses that said “it depends” and the results showed that there still was no statistical significance between personal preference and reference preference. Originality/value – Libraries can rebrand their services by utilizing and advocating for discovery tools, but it will only happen if they are willing to make changes on their attitudes toward discovery tools.

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