Relevant bibliographies by topics / Maximal frequency selection

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers
  5. Reports

Academic literature on the topic 'Maximal frequency selection'

Author: Grafiati
Published: 25 May 2024
Last updated: 31 July 2025

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Journal articles on the topic "Maximal frequency selection"

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Soriano, Jonathan, and Sarah Marzen. "How Well Can We Infer Selection Benefits and Mutation Rates from Allele Frequencies?" Entropy 25, no. 4 (2023): 615. http://dx.doi.org/10.3390/e25040615.

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Experimentalists observe allele frequency distributions and try to infer mutation rates and selection coefficients. How easy is this? We calculate limits to their ability in the context of the Wright-Fisher model by first finding the maximal amount of information that can be acquired using allele frequencies about the mutation rate and selection coefficient– at least 2 bits per allele– and then by finding how the organisms would have shaped their mutation rates and selection coefficients so as to maximize the information transfer.
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Luhanga, Matthew L. "Packet Error Probability for Diversity Systems in Slow Rayleigh Fading and Gaussian Noise." International Journal of Electrical Engineering & Education 23, no. 3 (1986): 239–44. http://dx.doi.org/10.1177/002072098602300309.

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Analytical results on packet error probability for noncoherent frequency-shift-keying (NCFSK) and differential phase-shift-keying (DPSK) systems with diversity reception operating over slow Rayleigh fading channels with Gaussian noise are derived. Expressions obtained are applicable to two linear combining schemes: selection combining and maximal-ratio combining.
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Ma, Debiao, Junteng Zheng, and Lizhi Peng. "Performance Evaluation of Epileptic Seizure Prediction Using Time, Frequency, and Time–Frequency Domain Measures." Processes 9, no. 4 (2021): 682. http://dx.doi.org/10.3390/pr9040682.

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The prediction of epileptic seizures is crucial to aid patients in gaining early warning and taking effective intervention. Several features have been explored to predict the onset via electroencephalography signals, which are typically non-stationary, dynamic, and varying from person-to-person. In the former literature, features applied in the classification have shared similar contributions to all patients. Therefore, in this paper, we analyze the impact of the specific combination of feature and channel from time, frequency, and time–frequency domains on prediction performance of disparate
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Kuroha, Akihiro, Chang-Jun Ahn, Tatsuya Omori, and Ken-ya Hashimoto. "Multiuser Diversity OFDMA using Power Priority Selection and Adaptive Clipping." International Journal of Distributed Systems and Technologies 5, no. 4 (2014): 18–30. http://dx.doi.org/10.4018/ijdst.2014100102.

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In recent, orthogonal frequency division multiple access (OFDMA) has been used for a multiuser wireless communication. In a wireless network, the transmitted signal of each user has independent channel fluctuation characteristic. By using this characteristic, OFDMA can achieve the multiuser diversity (MUDiv). Until this time, to achieve a low complexity and performance improvement, the adaptive subcarrier block (ASB) and frequency symbol spreading (FSS) methods have been proposed. However, the system performance in a low Eb/N0 is worse than that of maximal sum capacity (MSC) and peak to averag
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Marden, J. H., M. R. Wolf, and K. E. Weber. "Aerial performance of Drosophila melanogaster from populations selected for upwind flight ability." Journal of Experimental Biology 200, no. 21 (1997): 2747–55. http://dx.doi.org/10.1242/jeb.200.21.2747.

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A computerized system for three-dimensional tracking of large numbers of individual free-flying insects was used to assess the performance of Drosophila melanogaster from populations that had undergone 160 generations of selection for upwind flight ability. Compared with control lines, the selected lines showed significant increases in mean flight velocity, decreases in angular trajectory and a significant change in the interaction between velocity and angular trajectory. Maximal flight velocity was apparent as a sharply defined upper boundary of the distribution of horizontal and vertical vel
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Trinh, Le-Huy, and Fabien Ferrero. "Multiband Frequency Tuneable Antennas for Selection Combining Strategy in White Space Applications." Applied Sciences 12, no. 21 (2022): 11062. http://dx.doi.org/10.3390/app122111062.

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This article presents a reconfigurable antenna using digitally tuneable capacitors (DTCs). Mounted on a 120 × 200 mm2 ground plane, the radiating element has very compact dimensions of 0.06λg × 0.016λg × 0.0016λg (with λg being the wavelength at 585 MHz). The proposed structure could be operated in the white-space frequency band from 470 to 700 MHz. The antenna system is composed of two radiated elements that are placed at the corner of the board. The active components were soldered onto the antennas and controlled by an embedded microcontroller via the I2C interface. Antenna impedances were s
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Bendelac, A., P. Matzinger, R. A. Seder, W. E. Paul, and R. H. Schwartz. "Activation events during thymic selection." Journal of Experimental Medicine 175, no. 3 (1992): 731–42. http://dx.doi.org/10.1084/jem.175.3.731.

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During their differentiation in the mouse thymus, CD4+8- cells undergo several of the sequential changes observed upon normal activation of mature, peripheral CD4+ lymphocytes. Expression of CD69, an early activation marker, is first observed on a minority of cells at the T cell receptor (TCR)lo/med double-positive stage, is maximal (50-90%) on heat-stable antigen (HSA)hi TCRhi double-positive, HSAhi TCRmed CD4+8lo, and HSAhi TCRhi CD4+8- cells, and is downmodulated at the mature HSAlo CD4+8- stage. In contrast, CD44, a late activation marker, is selectively expressed at the HSAlo stage. The s
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GRYLLIAS, KONSTANTINOS C., and IOANNIS ANTONIADIS. "A PEAK ENERGY CRITERION (P. E.) FOR THE SELECTION OF RESONANCE BANDS IN COMPLEX SHIFTED MORLET WAVELET (CSMW) BASED DEMODULATION OF DEFECTIVE ROLLING ELEMENT BEARINGS VIBRATION RESPONSE." International Journal of Wavelets, Multiresolution and Information Processing 07, no. 04 (2009): 387–410. http://dx.doi.org/10.1142/s0219691309002982.

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Complex Shifted Morlet Wavelets (CSMW) present a number of advantages when used for the demodulation of the vibration response of defective rolling element bearings: (A) They present the optimally located window simultaneously in the time and in the frequency domains; (B) They allow for the maximal time-frequency resolution; (C) The magnitudes of the complex wavelet coefficients in the time domain lead directly to the required envelope; (D) They allow for the optimal selection of both the center frequency and the bandwidth of the requested filter. A Peak Energy criterion (P. E.) is proposed in
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Moiseev, A. A. "Model-based estimation of radio parameters." Radio industry 28, no. 3 (2018): 31–45. http://dx.doi.org/10.21778/2413-9599-2018-28-3-31-45.

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It’s proposed to use model-based approach for evaluation of radiation parameters observed by passive location facilities. This method is based on model parameters adjustment and interpretation of correspondent parameters values as experimental parameters evaluations. Evaluation adequacy criterion in this case is maximal probability of overlapping of experimental and model ranges of parameters. Preliminary objects selection can be based on frequency or/end directional characteristics of received signals. A possible selection criterion is based on discrimination conditions of frequency and time
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Smerlak, M. "Neutral quasispecies evolution and the maximal entropy random walk." Science Advances 7, no. 16 (2021): eabb2376. http://dx.doi.org/10.1126/sciadv.abb2376.

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Even if they have no impact on phenotype, neutral mutations are not equivalent in the eyes of evolution: A robust neutral variant—one which remains functional after further mutations—is more likely to spread in a large, diverse population than a fragile one. Quasispecies theory shows that the equilibrium frequency of a genotype is proportional to its eigenvector centrality in the neutral network. This paper explores the link between the selection for mutational robustness and the navigability of neutral networks. I show that sequences of neutral mutations follow a “maximal entropy random walk,
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Dissertations / Theses on the topic "Maximal frequency selection"

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Taki, Nour. "Diagnosis of Soft Faults in Complex Wired Networks." Electronic Thesis or Diss., université Paris-Saclay, 2022. http://www.theses.fr/2022UPASG004.

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Les câbles électriques sont utilisés dans tous les secteurs pour transférer de l'énergie ou de l'information. Pendant le fonctionnement, les câbles peuvent être sujets à des défauts francs (circuit ouvert ou court-circuit) ou des défauts non-francs (endommagement de l'isolant, pincement, etc.) dus à une mauvaise utilisation, aux conditions environnementales ou au vieillissement. Ces défauts doivent être détectés à leur stade le plus précoce pour éviter une interruption de la fonction ou des conséquences plus graves. Parmi les méthodes de diagnostic des réseaux filaires qui ont été étudiées dan
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Segkos, Michail. "Advanced techniques to improve the performance of OFDM Wireless LAN." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2004. http://library.nps.navy.mil/uhtbin/hyperion/04Jun%5FSegkos.pdf.

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Thesis (M.S. in Electrical Engineering and M.S. in Applied Physics)--Naval Postgraduate School, June 2004.<br>Thesis advisor(s): Tri T. Ha, Brett H. Borden. Includes bibliographical references (p. 107-109). Also available online.
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Chi, Xuan. "The Impact of Channel Estimation Error on Space-Time Block and Trellis Codes in Flat and Frequency Selective Channels." Thesis, Virginia Tech, 2002. http://hdl.handle.net/10919/33963.

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Recently multiple antenna systems have received significant attention from researchers as a means to improve the energy and spectral efficiency of wireless systems. Among many classes of schemes, Space-Time Block codes (STBC) and Space-Time Trellis codes (STTC) have been the subject of many investigations.<p> Both techniques provide a means for combatting the effects of multipath fading without adding much complexity to the receiver. This is especially useful in the downlink of wireless systems. In this thesis we investigate the impact of channel estimation error on the performance of both ST
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Aldosari, Mansour. "Design and analysis of green mobile communication networks." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/design-and-analysis-of-green-mobile-communication-networks(37b5278a-45da-4a81-b89c-54c7d876586a).html.

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Increasing energy consumption is a result of the rapid growth in cellular communication technologies and a massive increase in the number of mobile terminals (MTs) and communication sites. In cellular communication networks, energy efficiency (EE) and spectral efficiency (SE) are two of the most important criteria employed to evaluate the performance of networks. A compromise between these two conflicting criteria is therefore required, in order to achieve the best cellular network performance. Fractional frequency reuse (FFR), classed as either strict FFR or soft frequency reuse (SFR), is an
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Ben, Salem Aymen. "The Application of Multiuser Detection to Spectrally Efficient MIMO or Virtual MIMO SC-FDMA Uplinks in LTE Systems." Thèse, Université d'Ottawa / University of Ottawa, 2013. http://hdl.handle.net/10393/30351.

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Single Carrier Frequency Division Multiple Access (SC-FDMA) is a multiple access transmission scheme that has been adopted in the 4th generation 3GPP Long Term Evolution (LTE) of cellular systems. In fact, its relatively low peak-to-average power ratio (PAPR) makes it ideal for the uplink transmission where the transmit power efficiency is of paramount importance. Multiple access among users is made possible by assigning different users to different sets of non-overlapping subcarriers. With the current LTE specifications, if an SC-FDMA system is operating at its full capacity and a new user re
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Wang, Chao. "Exploiting non-redundant local patterns and probabilistic models for analyzing structured and semi-structured data." Columbus, Ohio : Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1199284713.

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Rakshith, M. R. "Algorithms For Spatial Modulation Systems." Thesis, 2013. http://etd.iisc.ac.in/handle/2005/3905.

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It is well known that multiple antennas at the transmitter and receiver are imperative for reliable and high data-rate communication over wireless channels. However, these systems essentially need multiple radio frequency (RF) chains owing to multiple antennas, and hence pose challenges for applications with limited form-factor. Antenna Selection (AS) techniques alleviate this problem by using only a subset of the total available antennas and hence require only a few RF chains compared to the number of antennas. These systems operate in a closed-loop scenario, where the information fed back fr
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Rakshith, M. R. "Algorithms For Spatial Modulation Systems." Thesis, 2013. http://etd.iisc.ernet.in/2005/3905.

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It is well known that multiple antennas at the transmitter and receiver are imperative for reliable and high data-rate communication over wireless channels. However, these systems essentially need multiple radio frequency (RF) chains owing to multiple antennas, and hence pose challenges for applications with limited form-factor. Antenna Selection (AS) techniques alleviate this problem by using only a subset of the total available antennas and hence require only a few RF chains compared to the number of antennas. These systems operate in a closed-loop scenario, where the information fed back fr
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Book chapters on the topic "Maximal frequency selection"

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Borms, Samuel, Kris Boudt, Frederiek Van Holle, and Joeri Willems. "Semi-supervised Text Mining for Monitoring the News About the ESG Performance of Companies." In Data Science for Economics and Finance. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-66891-4_10.

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AbstractWe present a general monitoring methodology to summarize news about predefined entities and topics into tractable time-varying indices. The approach embeds text mining techniques to transform news data into numerical data, which entails the querying and selection of relevant news articles and the construction of frequency- and sentiment-based indicators. Word embeddings are used to achieve maximally informative news selection and scoring. We apply the methodology from the viewpoint of a sustainable asset manager wanting to actively follow news covering environmental, social, and govern
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Mekler, Philipp, and Jingshu Sun. "Pharma Tender Processes: Modeling Auction Outcomes." In Quantitative Models in Life Science Business. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-11814-2_4.

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AbstractThis chapter summarizes the overall tendering and contracting process in the pharmaceutical industry by providing an overview of the first-sealed price auction theory, auction rules, and drug pricing mechanism of different countries. Comparing procurement systems across Asia, Africa, Europe, and Latin America, the review casts light on various pharmaceutical bidding systems across the world and their impact on drug prices. Then, this review focuses on the empirical estimation of first-price auction models. In terms of model specification, we compare the two most commonly used empirical
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Inga, Juan, Brayan Peñafiel, and Andrés Ortega. "Pilot Channel Estimation for Improve the Non-Linear Effects on GFDM-MIMO Scheme." In Lecture Notes in Networks and Systems. Springer Nature Switzerland, 2025. https://doi.org/10.1007/978-3-031-87065-1_2.

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Abstract This paper analyzes the performance of a generalized frequency division multiplexing scheme for multiple-input multiple-output configuration (MIMO-GFDM) in the presence of nonlinear power amplification with pilot insertion at the transmitter side to evaluate the saturation effects. For this purpose, two non-ideal transfer functions of high power amplifiers (HPA) are modeled: a Traveling Wave Tube Amplifier (TWTA) and a Solid State Power Amplifier (SSPA). In addition, for nonlinear distortion cancellation, we explore some peak-to-average power ratio (PAPR) reduction techniques, such as
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Greenlaw, Raymond, H. James Hoover, and Walter L. Ruzzo. "Greedy Algorithms." In Limits to Parallel Computation. Oxford University Press, 1995. http://dx.doi.org/10.1093/oso/9780195085914.003.0011.

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We consider the selection of two basketball teams at a neighborhood playground to illustrate the greedy method. Usually the top two players are designated captains. All other players line up while the captains alternate choosing one player at a time. Usually, the players are picked using a greedy strategy. That is, the captains choose the best unclaimed player. The system of selection of choosing the best, most obvious, or most convenient remaining candidate is called the greedy method. Greedy algorithms often lead to easily implemented efficient sequential solutions to problems. Unfortunately
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Ziani Benameur and Ouinten Youcef. "Combining Data Mining Technique and Query Frequencies for Automatic Selection of Indexes in Data Warehouses." In Frontiers in Artificial Intelligence and Applications. IOS Press, 2013. https://doi.org/10.3233/978-1-61499-161-8-71.

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Index selection is an important part of physical database design. Its goal is to select an appropriate set of indexes to minimize the cost for a given workload under storage constraint. However, selecting a suitable configuration of indexes is a difficult problem to solve. The problem becomes more complex for indexes defined on multiple tables such as bitmap join indexes, since it requires the exploration of a much more search space. Studies dealing with the bitmap join indexes selection problem mainly focused on proposing pruning solutions of the search space by the means of data mining techn
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"Induction Heating Power Supplies." In Elements of Induction Heating. ASM International, 1988. http://dx.doi.org/10.31399/asm.tb.eihdca.t65220047.

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Abstract Besides the induction coil and workpiece, the induction generator (source of ac power) is probably the most important component of an overall induction heating system. Such equipment is typically rated in terms of its frequency and maximum output power (in kilowatts). This chapter addresses the selection of power supplies in terms of these two factors as well as the operational features of different types of sources. The six different types of power supplies for induction heating applications covered in this chapter are line-frequency supplies, frequency multipliers, motor-generators,
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Ahmad, Ishfaq, Alam Zeb Khan, Mirza Barjees Baig, and Ibrahim M. Almanjahie. "Flood Frequency Analysis Using Bayesian Paradigm." In Advances in Environmental Engineering and Green Technologies. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-5225-9771-1.ch005.

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At-site flood frequency analysis (FFA) of extreme hydrological events under Bayesian paradigm has been carried out and compared with frequentist paradigm of maximum likelihood estimation (MLE). The main objective of this chapter is to identify the best approach between Bayesian and frequentist one for at-site FFA. As a case study, the data of only two stations were used, Kotri and Rasul, and Bayesian and MLE approaches were implemented. Most commonly used tests were applied for checking initial assumptions. Goodness of fit (GOF) tests were used to identify the best model, which indicated that
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"Selection of flood frequency model in Niger Basin using maximum likelihood method." In Water and Urban Development Paradigms. CRC Press, 2008. http://dx.doi.org/10.1201/9780203884102-53.

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Agbede, O., J. Adewumi, J. Akinyemi, and G. Bolaji. "Selection of flood frequency model in Niger Basin using maximum likelihood method." In Water and Urban Development Paradigms. CRC Press, 2008. http://dx.doi.org/10.1201/9780203884102.ch42.

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Hari, Riitta, and Aina Puce. "Visual Responses." In MEG-EEG Primer, edited by Riitta Hari and Aina Puce. Oxford University Press, 2017. http://dx.doi.org/10.1093/med/9780190497774.003.0013.

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This chapter introduces visual evoked responses. Transient VEPs are maximal across the posterior scalp and consist of three main deflections—N75, P100, and N135. Magnetic VEFs also show a prominent occipital response peaking at around 100 ms. Visual stimulation can include light flashes, pattern onset/offsets, pattern reversals and natural images. The extent and eccentricity of the visual stimulus can selectively encompass foveal or extrafoveal regions, or include quadrants, hemifield or the entire visual field. Stimulus attributes such as visual angle, spatial frequency, luminance and contras
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Conference papers on the topic "Maximal frequency selection"

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Prager, Martin. "Lessons Learned from Corrosion Fatigue Testing Castings." In CORROSION 1986. NACE International, 1986. https://doi.org/10.5006/c1986-86143.

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Abstract Fatigue testing castings in aggressive, corrosive media presents particular problems with regard to specimen size, thermal history, quality and configuration. This paper presents factors to be considered when selecting test methods and specimen configurations based on experience in programs with bronze and stainless steel castings. Issues considered include frequency effects, crack propagation, extrapolation of data and the influence of mean stresses. It is concluded that if the key variables are properly studied and understood useful guidance in materials selection can be obtained. E
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Yuan, Juntao, Xuehui Zhao, Anqing Fu, et al. "Material Selection for Oil and Gas Wells in O2-CO2 Coexistence Environment in Western China." In CONFERENCE 2025. AMPP, 2025. https://doi.org/10.5006/c2025-00390.

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Abstract With the popularization and application of production enhancement measures such as nitrogen gas injection gas lift and nitrogen drainage in oil and gas wells in western China, corrosion failures of wellhead devices, downhole tubing strings and tools occur frequently. Oxygen ingress has become one of the main causative factors inducing the failure of metallic materials. In this work, the corrosion behavior of a variety of materials in O2-CO2 coexistence environment was investigated. Based on the experimental results of general corrosion, maximum pitting rate, morphology and composition
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Smuga-Otto, Iwona, Jarek Nowinka, Graham Wilde, and Bernie Luft. "Coiled Tubing Performance Evaluation for Sour Service under Variable Loading Conditions." In CORROSION 2001. NACE International, 2001. https://doi.org/10.5006/c2001-01080.

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Abstract Coiled tubing (CT) has been used extensively for underbalanced drilling in non-sour applications with great success; however, attempts to utilize it for sour service produced frequent failures due to tubing environmental cracking. Specific operational conditions of CT, involving a combination of cyclic plastic strain of CT material (associated with travel on/off a reel) and periodic exposure to sour environments, typically result in a significantly poorer CT performance in comparison with non-sour applications, or with sour service at stresses below yield. An experimental program was
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Khan, Muhammad Umar, Anila Kousar, Mehboob Alam, and Yehia Massoud. "Frequency Selective Light Scattering and Absorption for Maximum Energy Harvesting." In 2019 31st International Conference on Microelectronics (ICM). IEEE, 2019. http://dx.doi.org/10.1109/icm48031.2019.9021275.

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Al-Dweik, A., R. Hamila, L. Samara, and O. Filio-Rodriguez. "Maximum likelihood detection of precoded SFBC in frequency-selective fading channels." In 2017 IEEE 28th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC). IEEE, 2017. http://dx.doi.org/10.1109/pimrc.2017.8292612.

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Collins, Timothy M., and Mohammad Robiul Hossan. "Radio Frequency and Microwave Power Absorption in Spherical Shaped Objects." In ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-71334.

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Microwave and radio frequency heating has great promise in many engineering and biomedical applications because of its non-contact, volumetric selective heating. However, the heating patterns and temperature distributions are non-uniform due to non-uniform electromagnetic power absorptions. In this study, we present a closed-form analytic expression of electromagnetic field distribution and power absorption in a spherical shaped object. A simplified Maxwell’s equation that represents plane wave is solved in spherical coordinates using vector potentials and separation of variables. The electrom
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Nam, Woosung, Ju-Young Shin, Hongjoon Shin, and Jun-Haeng Heo. "Selection of Variables for Regional Frequency Analysis of Annual Maximum Precipitation Using Multivariate Techniques." In World Environmental and Water Resources Congress 2007. American Society of Civil Engineers, 2007. http://dx.doi.org/10.1061/40927(243)411.

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Shi, Zhenning, and Mark C. Reed. "Iterative Maximal Ratio Combining Channel Estimation for Multiuser Detection on a Time Frequency Selective Wireless CDMA Channel." In 2007 IEEE Wireless Communications and Networking Conference. IEEE, 2007. http://dx.doi.org/10.1109/wcnc.2007.190.

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Jin, Yaqiang, Zhiliang Liu, Jinlong Kang, Jie Yin, and Dandan Peng. "Frequency Band Selection Based on a New Indicator: Accuracy Rate." In ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-71340.

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Local defects in rotating machinery give rise to periodic impulses in vibrations. In order to acquire the information of these faults, various diagnostic methods have been proposed in the past decades. Most methods used the squared envelope spectrum (i.e., the spectrum of the squared envelope) as the final diagnostic tool, but different preprocessing steps were used before obtaining the envelope signal. The key problem is to obtain the center frequency and bandwidth of the fault signal, then analyze the envelope (squared envelope spectrum) of the band-pass filtered signal. The framework of acc
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Lakshmanan, M. K., I. Budiarjo, and H. Nikookar. "Maximally Frequency Selective Wavelet Packets Based Multi-Carrier Modulation Scheme for Cognitive Radio Systems." In IEEE GLOBECOM 2007-2007 IEEE Global Telecommunications Conference. IEEE, 2007. http://dx.doi.org/10.1109/glocom.2007.796.

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Reports on the topic "Maximal frequency selection"

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Whitaker, Stephen. Rocky intertidal community monitoring at Channel Islands National Park: 2018–19 annual report. National Park Service, 2023. http://dx.doi.org/10.36967/2299674.

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Channel Islands National Park includes the five northern islands off the coast of southern California (San Miguel, Santa Rosa, Santa Cruz, Anacapa, and Santa Barbara Islands) and the surrounding waters out one nautical mile. There are approximately 176 miles of coastline around the islands, about 80% of which is composed of rock. The diversity and undisturbed nature of the tidepools of this rocky coastline were recognized as special features of the islands in the enabling legislation. To conserve these communities unimpaired for future generations, the National Park Service has been monitoring
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