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Artículos de revistas sobre el tema "Altitude, Influence of"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 1 de agosto de 2024

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1

de Aquino Lemos, Valdir, Ronaldo Vagner Thomatieli dos Santos, Fabio Santos Lira, Bruno Rodrigues, Sergio Tufik, and Marco Tulio de Mello. "Can High Altitude Influence Cytokines and Sleep?" Mediators of Inflammation 2013 (2013): 1–8. http://dx.doi.org/10.1155/2013/279365.

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The number of persons who relocate to regions of high altitude for work, pleasure, sport, or residence increases every year. It is known that the reduced supply of oxygen (O2) induced by acute or chronic increases in altitude stimulates the body to adapt to new metabolic challenges imposed by hypoxia. Sleep can suffer partial fragmentation because of the exposure to high altitudes, and these changes have been described as one of the responsible factors for the many consequences at high altitudes. We conducted a review of the literature during the period from 1987 to 2012. This work explored th

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2

Shangpliang, P. Wankitlang, Rupa Nylla K. Hooroo, Graham Bakynson Ranee, Sudhanya Ray Hajong, Annu Kumari, and Eugene Lyngkhoi. "Exploring Altitude's Influence: Contrasting Embryonic Development of Hyla annectans Jerdon in High and Low Altitude Environments." UTTAR PRADESH JOURNAL OF ZOOLOGY 45, no. 7 (March 21, 2024): 1–9. http://dx.doi.org/10.56557/upjoz/2024/v45i73967.

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The study investigated the embryonic development of Hyla annectans Jerdon, a frog species, at high and low altitude breeding sites of Meghalaya, North East India. Results revealed significant differences in the duration of embryonic development and hatching between the two altitudes. Embryos at low altitude sites exhibited a faster development, hatching approximately four days earlier than those at high altitude sites. Early embryonic stages displayed similar characteristics in size between the two sites, but distinct differences emerged during later stages, notably in stages associated with h

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3

Tang, Yan Fei, Chao Ding, Ya Ping He, De Chuang Zhou, and Jian Wang. "Studies on the Effect of Altitude on the Flammable Liquids' Flash Point." Advanced Materials Research 908 (March 2014): 345–48. http://dx.doi.org/10.4028/www.scientific.net/amr.908.345.

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Presented in this paper is part of an experimental series conducted at different altitudes to investigate the influence of altitude on the flammable liquids flash point. The BS-1 closed bomb apparatus is used to measure the flash points of two flammable liquids (dimethylacetylamide (DMA) and RP-5 Jet A) in a hypobaric chamber under the altitude change from 4860 km to the sea level. The experimental results show that the flash points of DMA and Jet A decrease linearly with the increase in altitude in the low altitude region below the corresponding critical altitudes but non-linearly above. The

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PUTRA, HIRMAS FUADY, DHENOK SEKAR AMBARWATI, NURRIZKI MUBYRASIH, and TERSI ALESTI. "Karakteristik Fisiologis Lumut pada Beberapa Ketinggian di Kawasan Gunung Tangkuban Perahu." Jurnal Sumberdaya Hayati 1, no. 2 (May 4, 2016): 60–63. http://dx.doi.org/10.29244/jsdh.1.2.60-63.

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Environmental factors greatly influence the physiological state of moss. Some of the environmental factors that influence the physiological of moss are air temperature, humidity, and light intensity. These three environmental factors will vary at each altitude. This study aims to determine the physiological characteristics of mosses on some altitudes in the area of Mount Tangkuban Perahu (Ratu Crater – Domas Crater track). The method that are used is to measure air temperature, humidity, and light intensity at some altitudes. Subsequently, samples were taken at each altitude, to measured chlor

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5

Xie, Gongliang, Sen Liu, Ting Chang, and Ninghua Zhu. "Forest Adaptation to Climate Change: Altitudinal Response and Wood Variation in Natural-Growth Cunninghamia lanceolata in the Context of Climate Change." Forests 15, no. 3 (February 21, 2024): 411. http://dx.doi.org/10.3390/f15030411.

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This research delves into the impact of climate change on the wood traits of Cunninghamia lanceolata across various altitudinal gradients, aiming to understand the influence of altitude and climatic factors like temperature and precipitation on key wood characteristics. Employing a comprehensive approach, samples were collected from different altitudes for detailed phenotypic analysis. Methods included Pearson correlation, principal component analysis, cluster analysis, and random forest analysis. Results revealed significant variations in wood traits such as heartwood ratio, tracheid length,

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Bordjan, Dejan, and Davorin Tome. "Nest survival of Great Tit Parus major in spatial and temporal gradient." Acta Biologica Slovenica 56, no. 1 (July 1, 2013): 55–63. http://dx.doi.org/10.14720/abs.56.1.15549.

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The aim of the study was to compare nest survival of Great Tit between different regions, altitudes and years to discern which has the highest influence. Temperature is known to be prominent for breeding parameters and it changes consistently with altitude. Our hypothesis was that altitude has greater influence on nest survival than the region and year. Breeding parameters were monitored with the use of nestboxes over a three year period at three altitude belts in two regions. The main factor influencing nesting success was modelled using daily survival rate in the program MARK. We gathered da

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7

Spring, Allison M., Kenneth D. Domingue, Thomas V. Kerber, Margaret M. Mooney, Rebecca L. Hale, Kristina M. Lemmer, and Kathryn M. Docherty. "Land Use Effects on Airborne Bacterial Communities Are Evident in Both Near-Surface and Higher-Altitude Air." Diversity 13, no. 2 (February 18, 2021): 85. http://dx.doi.org/10.3390/d13020085.

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Land use influences the composition of near-surface airborne bacterial communities, and bacteria can be transported through the atmosphere at global scales. The atmosphere mixes vertically, but rigorously assessing whether the effects of land use on atmospheric communities extends to higher altitudes requires examining communities from multiple altitudes collected at a stable location and timeframe. In this study, we collected near-surface (<2 m) and higher-altitude (150 m) air samples from three sites in an agricultural/developed location and a forested/undeveloped location. We used bacter

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Zakraoui, Mariem, Hédia Hannachi, Igor Pasković, Nikolina Vidović, Marija Polić Pasković, Igor Palčić, Nikola Major, Smiljana Goreta Ban, and Lamia Hamrouni. "Effect of Geographical Location on the Phenolic and Mineral Composition of Chetoui Olive Leaves." Foods 12, no. 13 (June 30, 2023): 2565. http://dx.doi.org/10.3390/foods12132565.

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In this study, we investigated the influence of pedological parameters and variation of altitude on the mineral nutrients, phenolic compounds, and antioxidant activities of olive leaves. Samples of the Chetoui cultivar were collected from eight geographical locations with different altitudes. Levels of phenolic compounds varied according to the altitude. Classification of the locations revealed that altitude 1 (>500 m) was characterized by high levels of secoiridoids and simple phenols, while altitude 2 (500–300 m) and altitude 3 (<300 m) were higher in flavonoids. Levels of Mn, Ca and B

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Rohima, Ira Endah, Mohamad Djali, Yana Cahyana, Jajang Sauman Hamdani, and Mohd Nizam Lani. "Effect of Cultivation at Different Altitudes on the Chemical, Functional and Pasting Properties of Starch Medians Cultivar Potato (Solanum tuberosum L.)." INTERNATIONAL JOURNAL OF AGRICULTURAL AND STATISTICAL SCIENCES 20, no. 01 (June 2024): 33. http://dx.doi.org/10.59467/ijass.2024.20.33.

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The cultivation elevation of potatoes plays a crucial role that influences starch quality. Little is known on the impact of varying altitudes on starch quality. Therefore, this new study analyzed the starch attributes of the Median?s potato variety (Solanum tuberosum L.) cultivated at three distinct altitudinal zones: lowlands, midlands, and highlands. The objective was to elucidate the impact of these varying altitudes on the chemical composition, functional qualities and pasting behavior of starch derived from the Median?s cultivar. Utilizing a randomized block design with quadruplicate tria

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10

Lei, Tian, Jinliang Xu, Xingli Jia, Leyu Wei, and Lin Tian. "Impact of High-Altitude on Truck’s Climbing Speed: Case study in Qinghai-Tibet Plateau Area in China." Journal of Advanced Transportation 2019 (August 20, 2019): 1–14. http://dx.doi.org/10.1155/2019/8560204.

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Truck’s climbing performance is an important consideration in traffic safety, efficiency, and highway geometric design. With the infrastructure development in high-altitude area in China, more attention needs to be paid on truck’s climbing performance in such area. In this article, truck’s climbing speed in high-altitude area was examined through field tests on different grade sections at different altitudes. Truck’s speed-distance curves were built at different altitudes and the impact of altitude on truck’s climbing speed was explored based on the test results. It was shown that, within the

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Hovenden, Mark J., and Tim Brodribb. "Altitude of origin influences stomatal conductance and therefore maximum assimilation rate in Southern Beech, Nothofagus cunninghamii." Functional Plant Biology 27, no. 5 (2000): 451. http://dx.doi.org/10.1071/pp99164.

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Gas exchange measurements were made on saplings of Southern Beech, Nothofagus cunninghamii (Hook.) Oerst. collected from three altitudes (350, 780 and 1100 m above sea level) and grown in a common glasshouse trial. Plants were grown from cuttings taken 2 years earlier from a number of plants at each altitude in Mt Field National Park, Tasmania. Stomatal density increased with increasing altitude of origin, and stomatal con-ductance and carbon assimilation rate were linearly related across all samples. The altitude of origin influenced thestomatal conductance and therefore carbon assimilation r

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Tu, Ran, Yi Zeng, Jun Fang, and Yong-Ming Zhang. "Influence of high altitude on the burning behaviour of typical combustibles and the related responses of smoke detectors in compartments." Royal Society Open Science 5, no. 4 (April 2018): 180188. http://dx.doi.org/10.1098/rsos.180188.

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The effect of altitude on typical combustible burning and related smoke detector response signals was investigated by comparison experiments at altitudes of 40 m and 3650 m based on EN54 standard tests. Point-type light scattering photoelectric smoke detectors and ionization smoke detectors were used for four kinds of EN54 fire tests, including two kinds of smouldering fires with wood (test fire no. 2 in EN54 standard or TF2) and cotton (TF3), and two kinds of flaming fires with polyurethane (TF4) and n -heptane (TF5). First, the influence of altitude or ambient pressure on mass loss for smoul

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Carvalho, Biange Maria Cezário de, Raquel Leite Wainfas, Tayanna Rodrigues, Lidiane Coelho Berbert, Thaiane Franklin, Ivyn Karla Lima de Sousa, and Ronaldo Figueiró. "Black fly (Diptera:Simuliidae) larvae body size variation along an altitude gradient in the Itatiaia National Park, Brazil." Revista Acta Ambiental Catarinense 13, no. 1 (August 24, 2016): 1. http://dx.doi.org/10.24021/raac.v13i1.3314.

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According to Bergmann’s Rule, individuals who inhabit higher altitudes tend to be larger in body mass or size, when compared with individuals of the same taxon who inhabit lower altitude places. Black flies are insects of great medical and veterinary importance due to its blood-sucking habit, becoming subject of studies regarding its bionomics, ecology and taxonomy. Studies approaching the influence of the altitude gradient in the morphology of Diptera: Simuliidae larvae are scarce in the literature, therefore, this study aimed to investigate the influence of altitude gradient in the morpholog

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14

Wang, Shuling, Zhe Shao, and Jie Li. "THE INFLUENCE OF VARIATION IN ALTITUDE ON ATHLETIC PERFORMANCE IN LONG-DISTANCE RUNNERS." Revista Brasileira de Medicina do Esporte 28, no. 5 (October 2022): 584–86. http://dx.doi.org/10.1590/1517-8692202228052022_0101.

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ABSTRACT Introduction: The academic community has demonstrated the link of athletic performance in track and field with critical factors of sports training, including the psychology of competition. Recently, research has been verified that athletic performance is also related to altitude, weather, ambiance, and the timing of the competition. There are no studies to provide theoretical and practical training experience in the regional environment of Ganzhou. Objective: This paper analyzes the influence of altitude training in professional performance athletes. Concurrently, analysis of the phys

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Yang, Xue, Long Di Cheng, Li Qian Huang, and Wen Hong Fan. "Study on the Correlation between the Property of Akund Fiber and its Growing Conditions." Advanced Materials Research 476-478 (February 2012): 1934–38. http://dx.doi.org/10.4028/www.scientific.net/amr.476-478.1934.

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In this paper ,the properties of akund fiber, growing at the altitudes of 813m, 1080m and 1153m from August to October were studied, respectively.The influences of altitude, month, fruit size and different parts of the fruit on the properties of akund fiber were also analyzed. It was found that the altitude and fruit size had a significant correlation coefficient with the property of akund fiber, while the influence of month on the property of akund fiber was not obvious. The properties of the fiber in different parts of the fruit were also different.The results will be beneficial to planting,

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16

Höffner, J., and J. S. Friedman. "Metal layers at high altitudes: A possible connection to meteoroids." Atmospheric Chemistry and Physics Discussions 4, no. 1 (January 20, 2004): 399–417. http://dx.doi.org/10.5194/acpd-4-399-2004.

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Abstract. In the past, many studies have been carried out to demonstrate the influence of meteoroids on the atmospheric metal layer, observed roughly in the altitude range 80–105 km. Even with the capability of present day resonance lidars to measure metal densities within single meteor trails, it has been difficult to prove any influence of meteors on the average metal layer. In contrast to approaches taken earlier, we discuss here the seasonal characteristics of potassium, calcium, calcium ion, iron and sodium above 110 km altitude where the average nocturnal densities are so low that the ex

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Höffner, J., and J. S. Friedman. "The mesospheric metal layer topside: a possible connection to meteoroids." Atmospheric Chemistry and Physics 4, no. 3 (May 26, 2004): 801–8. http://dx.doi.org/10.5194/acp-4-801-2004.

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Abstract. In the past, many studies have been carried out to demonstrate the influence of meteoroids on the atmospheric metal layer, observed roughly in the altitude range 80–105 km. Even with the capability of present day resonance lidars to measure metal densities within single meteor trails, it has been difficult to prove any influence of meteors on the average metal layer. In contrast to approaches taken earlier, we discuss here the seasonal characteristics of potassium, calcium, calcium ion, iron and sodium above 110 km altitude where the average nocturnal densities are so low that the ex

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18

Hevko, Bohdan, and Jurii Bondar. "Influence of flight mode on loads from turbulent air." MECHANICS OF GYROSCOPIC SYSTEMS, no. 42 (December 28, 2022): 117–27. http://dx.doi.org/10.20535/0203-3771422021268893.

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This paper investigated the influence of altitude and flight speed on the loads arising on the elastic wing of a turbojet aircraft of conventional layout, which falls into turbulent conditions. The aircraft structure is modeled by elastic beams with appropriate weight and stiffness distribution. Performed a modal analysis of the aircraft design and examined the influence of the number of calculated tones own oscillations on the loading of an aircraft wing. Aerodynamic forces and moments are determined by the dipole lattice and constant pressure method (DLM/CPM). Non-stationary characteristics

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19

Li, Qi, Mingyang Chen, Wenjing Xie, Qianyue Wang, Yue Wu, Chang Yang, and Jiangming Zhen. "Study on Energy-saving Lighting Design Method for Interior Zone of High-altitude Highway Tunnel." E3S Web of Conferences 189 (2020): 03035. http://dx.doi.org/10.1051/e3sconf/202018903035.

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In order to ensure the driving safety of high-altitude highway tunnel and effectively reduce the lighting cost, this paper adopts the method considering the influence of automobile headlights luminance which combines reaction time incremental theory at different altitudes and lighting design simulation calculation. The paper has studied the design pattern of high-altitude highway tunnel, which are dominated by fixed lighting and supplemented by automotive lighting. The results show that: to ensure driving safety, the luminance of the lighting design for interior zone of highway tunnel increase

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Ferreira, Anna Carolyna Fernandes, Felipe Vaz Andrade, Eduardo de Sá Mendonça, and Paulo Roberto da Rocha Júnior. "Land use and altitude: how do they influence the phosphorus fractions?" Acta Scientiarum. Agronomy 44 (May 24, 2022): e54801. http://dx.doi.org/10.4025/actasciagron.v44i1.54801.

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Soil use and management systems modify phosphorus (P) dynamics by changing the different P compartments. However, the interaction between land-use change and altitude is not clear. This study aimed to evaluate the effect of land use on P forms in different soil aggregate classes of Ultisols located at two altitudes. Soil samples were collected in four land-use systems (agroforestry system, secondary forest, pasture, and eucalyptus) located at two altitudes in the Atlantic Forest biome, Brazil. Phosphorus fractions were assessed using sequential fractionation. In general, recalcitrant forms rep

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Bambang Kholiq Mutaqin, Didin Supriat Tasripin, Lia Budimulyati Salman, Iin Susilawati, and Ujang Hidayat Tanuwiria1. "Comparisons and influence temperature humidity index to dairy cow productivity based on farm altitude." Agrivet : Jurnal Ilmu-Ilmu Pertanian dan Peternakan (Journal of Agricultural Sciences and Veteriner) 12, no. 1 (June 4, 2024): 13–18. http://dx.doi.org/10.31949/agrivet.v12i1.9458.

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This study aimed to determine the differences and effects of the Temperature Humidity Index (THI) on dairy cows’ productivity in West Java based on differences in farm altitude. Categorization based on area altitude can be divided into low altitude (<700 m asl), moderate (700-1000 m asl), and high (> 1,000 m asl). The parameters observed were body size, body weight, and milk production which were supplemented by environmental conditions namely temperature and humidity. The method used is a survey and direct observation by simple random sampling of animals. The results showed differences

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Bordjan, Dejan. "Nestling growth of Great Tits Parus major with comparison among altitudes." Acta Biologica Slovenica 56, no. 1 (July 1, 2013): 45–53. http://dx.doi.org/10.14720/abs.56.1.15548.

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Fledgling mass can have great influence on individual’s life history and reflects the availability and quality of food in the breeding territory. Thus growth curve is used to compare the difference in the quality between different ecological conditions. The aim of the study was to fill the knowledge gap on nestling growth in Great Tit in Slovenia, to determine the influence of altitude on it and to present a tool for estimating age of nestlings and key dates in breeding phenology of Great Tit. Great Tits young were monitored using nest-boxes at three locations between years 2010 and 2012. At t

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Chi Lin, Bo Zhang, Xiaolong Zhao, Donglin Xu, Taoxi Zong, Yong Shen, Yanxiang Tong, Shiying Chen, Weihua Chu, and Linjie Wei. "Hyperuricemia as a risk factor for cerebral hemorrhage in young and middle-aged hypertensive patients at high altitude." Neurology Asia 29, no. 2 (June 2024): 293–300. http://dx.doi.org/10.54029/2024jyx.

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Background: The purpose of this research was to investigate the effect of uric acid on hypertensive intracerebral hemorrhage (HICH) in young and middle-aged hypertensive patients at high altitude. Methods: High-altitude and low-altitude HICH patients were analyzed retrospectively, and the influence of uric acid on hemorrhage was analyzed by the correlations between age and uric acid, between age and hemoglobin, and between uric acid and hemoglobin. The individuals in the high- and low-altitude groups were assigned to a young/middle-aged group and an elderly group, and the correlation between a

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Girma, Bealu, Abera Gure, and Feyisa Wedajo. "Influence of Altitude on Caffeine, 5-Caffeoylquinic Acid, and Nicotinic Acid Contents of Arabica Coffee Varieties." Journal of Chemistry 2020 (August 12, 2020): 1–7. http://dx.doi.org/10.1155/2020/3904761.

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The influence of altitude on caffeine, 5-caffeoylquinic acid (5-CQA), and nicotinic acid contents of Arabica coffee varieties grown in Southwest Ethiopia was investigated. High-performance liquid chromatography with diode array detector (HPLC-DAD) was used for the determination of the target analytes. Coffee samples were collected from four coffee varieties, named as 74112, 7454, 7440, and 74110, which are cultivated in high, mid, and low altitudes in the study area. The findings of the study showed that the contents of caffeine and 5-CQA in both raw and roasted coffee beans decrease as the gr

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Liang, Tao, Weilin Tao, Yan Wang, Na Zhou, Wei Hu, Tao Zhang, Dunxiu Liao, Xinping Chen, and Xiaozhong Wang. "The Extension of Vegetable Production to High Altitudes Increases the Environmental Cost and Decreases Economic Benefits in Subtropical Regions." Land 12, no. 3 (March 11, 2023): 662. http://dx.doi.org/10.3390/land12030662.

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Global warming has driven the expansion of cultivated land to high-altitude areas. Intensive vegetable production, which is generally considered to be a high economic value and high environmental risk system, has expanded greatly in high-altitude mountainous areas of China. However, the environmental cost of vegetable production in these areas is poorly understood. In this study, pepper production at low (traditional pepper production area) and high (newly expanded area) altitudes were investigated in Shizhu, a typical pepper crop area. The output and environmental cost at the two altitudes we

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Roșian, Gheorghe, Csaba Horvath, Liviu Muntean, and Nicolae Baciu. "The Influence of Landform in the Distribution of Households of Ilva Mică Territorial Administrative Unit." Studia Universitatis Babeș-Bolyai Ambientum 66, no. 1-2 (November 30, 2022): 53–62. http://dx.doi.org/10.24193/subbambientum.2021.05.

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"In the case of territorial administrative units located in hilly and mountainous lands, landform, through its morphometric parameters, is a variable that introduces significant differences in the distribution of households. A similar situation is the case of the Ilva Mică commune, where, due to its position at the border between the Eastern Carpathians and the Transylvanian Basin, the landform is extremely varied. Among the parameters of the landform taken into consideration for tracking the distribution of households, the following parameters stand out: altitude, slope and slope aspect. The

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Coman, Năstaca-Alina, Mihai Babotă, Ingrid Nădășan, Alexandru Nicolescu, Alexandru Robert Pitaru, Ruxandra Ștefănescu, Andrei Mocan, Oleg Frumuzachi, and Corneliu Tanase. "The Influence of Ecological Factors on the Phytochemical Characteristics of Pinus cembra L." Applied Sciences 13, no. 18 (September 11, 2023): 10184. http://dx.doi.org/10.3390/app131810184.

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Pinus cembra L., also known as Swiss pine, is one of the lesser studied coniferous species, despite literature pointing out its great potential to be used for medical purposes due to its high contents in active phytochemicals. The aim of this study is to phytochemically assess rhytidome and periderm extracts obtained from Swiss pine from various locations and altitudes, so as to be able to deduce the best locations for harvesting samples with the highest biological activity. After the plant was analyzed histo-anatomically, hydroalcoholic extracts were obtained using ultrasounds, a rotary evapo

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Zhang, Rongrong, and Daifen Chen. "Investigation of Diesel Spray Characteristics in Low-temperature and Low-pressure Conditions." Bulletin of Science and Practice 10, no. 5 (May 15, 2024): 383–96. http://dx.doi.org/10.33619/2414-2948/102/48.

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This study investigates the influence of altitude and injection pressure on diesel fuel spray characteristics, aiming to optimize diesel usage in high-altitude conditions. Experiments were conducted at three altitude levels (plains, 1670 m, and 2400 m) with corresponding atmospheric pressures and temperatures, alongside six injection pressures ranging from 50 MPa to 100 MPa. The investigation focused on key spray parameters: equivalence ratio, spray penetration velocity, turbulence kinetic energy, evaporation rate, spray penetration distance, and Sauter Mean Diameter (SMD). Findings indicate t

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Duan, Yanan, Yuwen Liu, Yan Cheng, Ming Jiang, and Zhiyuan Zhang. "Research on Artillery Firing Trajectory under the Condition of Extra-large Elevation Difference between Artillery and Target in Plateau Area." Journal of Physics: Conference Series 2460, no. 1 (April 1, 2023): 012038. http://dx.doi.org/10.1088/1742-6596/2460/1/012038.

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Abstract Get the influence of shooting on the ballistic elements and correction elements of grenade under the condition of extra-large elevation difference between artillery and target in plateau area through simulation, and drawn the comparison chart of different altitude and elevation difference between artillery and target by using the simulation data. Calculate the variation characteristics of the hit range of laser terminal guided projectile under the condition of the elevation difference of extra-large elevation difference between artillery and target at different altitudes, and the infl

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Sangeetha, Thangavelu, Tajuddin Nargis Begum, Balasubramanian Balamuralikrishnan, Meyyazhagan Arun, Kannan R. R. Rengasamy, Natchiappan Senthilkumar, Shanmugam Velayuthaprabhu, Muthukrishnan Saradhadevi, Palanisamy Sampathkumar, and Arumugam Vijaya Anand. "Influence of SERPINA1 Gene Polymorphisms on Anemia and Chronic Obstructive Pulmonary Disease." Journal of the Renin-Angiotensin-Aldosterone System 2022 (October 17, 2022): 1–8. http://dx.doi.org/10.1155/2022/2238320.

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Background. Anemia is one of the predominant hematological conditions, whereas chronic obstructive pulmonary disease (COPD) is a predominant respiratory disease. These two diseases were found to be interlinked, but the physiological pathways are still unclear. Aim. The current study has been aimed at analysing the genetic interrelationship between anemia and COPD in accordance with different altitudes. Methodology. The genetic analysis was performed in the SERPINA1 gene of anemia, COPD, and healthy individuals for the analysis of single nucleotide polymorphism at rs28949274 and rs17580 locatio

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Peng, Qikai, Ruilin Liu, Guangmeng Zhou, Xumin Zhao, Surong Dong, and Zhongjie Zhang. "Study on Through-Flow Characteristics of a Diesel Two-Stage Supercharged Centrifugal Compressor under Variable-Altitude and Multiple Operating Conditions." Processes 12, no. 1 (December 23, 2023): 46. http://dx.doi.org/10.3390/pr12010046.

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Understanding the influence of environmental boundary parameters on the through-flow characteristics of two-stage supercharged centrifugal compressors is the key to maximizing the power recovery potential of diesel engines at high altitudes. In this paper, the influence of the compressor through-flow characteristics on the full-load thermal cycle performance of a diesel engine under variable altitude is studied by means of tests and simulation. The results show that with the increase in altitude, the range of stable work flow decreases, and the pressure ratio of the plugging point changes grea

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Chen, Yongming, Zehua Chang, Shiguo Xu, Peng Qi, Xiaoyu Tang, Yang Song, and Dongmei Liu. "Altitudinal Gradient Characteristics of Spatial and Temporal Variations of Snowpack in the Changbai Mountain and Their Response to Climate Change." Water 13, no. 24 (December 14, 2021): 3580. http://dx.doi.org/10.3390/w13243580.

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The variations in the snowpack in water towers of the world due to climate change have threatened the amount and timing of freshwater supplied downstream. However, it remains to be further investigated whether snowpack variation in water towers exhibits elevational heterogeneity at different altitude gradients and which climatic factors mainly influence these differences. Therefore, Changbai Mountain, a high-latitude water tower, was selected to analyze the changes in the snowpack by the methods of modified Mann–Kendall based on the daily meteorological data from the China Meteorological Data

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Wang, Wei, Xiangru Fu, Cong Wei, Yuanyuan Wang, and Shi Chen. "Study on Temperature Field in Common-rail Diesel Engine Combustion Chamber at Different Altitudes." Journal of Physics: Conference Series 2650, no. 1 (November 1, 2023): 012038. http://dx.doi.org/10.1088/1742-6596/2650/1/012038.

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Abstract The plateau covers 26% of China’s land area, the higher altitude, the lower atmospheric pressure, the smaller air density, the lower average temperature. Therefore diesel engine power decreases significantly, fuel consumption increases, starting performance deteriorates, and soot emissions increase. In this paper, virtual simulation and simulation test methods are used to study the temperature field change in the combustion chamber of CA6DL2-35E3R common-rail diesel engine at different altitudes and atmospheric pressures. The results show that the altitude has a great influence on the

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AYKUT, Medeni, and İhsan TUĞAL. "The influence of Altitude on the Species Composition of Diving Beetles (Coleoptera; Adephaga; Dytiscidae) of Eastern and South Eastern Region of Turkey." Journal of the Institute of Science and Technology 13, no. 3 (August 7, 2023): 1573–84. http://dx.doi.org/10.21597/jist.1330703.

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This study was carried out between 2013 and 2019 in five provinces located in Eastern and South Eastern Anatolian Region of Turkey. The dytiscid specimens were collected from a total of 226 sampling sites that altitudes varied between 500 and 2,700 meters. The 226 sampling sites were classified into one of six altitudinal levels defined by semi open intervals with amplitude of 300 m. A total of 45 species belonging to the family Dytiscidae were identified. A detailed ecological analysis related to altitude is made by means of the distribution of 45 identified species. The richness of species w

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Swayze, Neal C., Wade T. Tinkham, Matthew B. Creasy, Jody C. Vogeler, Chad M. Hoffman, and Andrew T. Hudak. "Influence of UAS Flight Altitude and Speed on Aboveground Biomass Prediction." Remote Sensing 14, no. 9 (April 21, 2022): 1989. http://dx.doi.org/10.3390/rs14091989.

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The management of low-density savannah and woodland forests for carbon storage presents a mechanism to offset the expense of ecologically informed forest management strategies. However, existing carbon monitoring systems draw on vast amounts of either field observations or aerial light detection and ranging (LiDAR) collections, making them financially prohibitive in low productivity systems where forest management focuses on promoting resilience to disturbance and multiple uses. This study evaluates how UAS altitude and flight speed influence area-based aboveground forest biomass model predict

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Xiao, Yanping, Furui Wang, and Peiyan Sun. "Numerical simulation of two-dimensional plain flap ground effect based on NACA4412 airfoil." Journal of Physics: Conference Series 2756, no. 1 (May 1, 2024): 012049. http://dx.doi.org/10.1088/1742-6596/2756/1/012049.

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Abstract Based on the NACA4412 airfoil, by solving a two-dimensional unsteady Reynolds-averaged N-S equation and using the k-ωSST model, this paper analyzes the influence of near-ground altitude change on different configuration flow fields under moving ground conditions and explores the variation law of wing pressure coefficient at different near-ground altitudes. The results show that the attraction of the upper airfoil is weakened by the GE (ground effect), the pressure of the lower airfoil is increased, and the upper and lower airfoils influence the lift change of the airfoil. With the dec

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Peña-Avelino, Luz Y., Ivonne Ceballos-Olvera, Gerardo N. Rosales-Martinez, Javier Hernández-Melendez, and Jorge Alva-Pérez. "Milk Composition of Creole Goats Raised at Different Altitudes in an Extensive Production System in Northeast Mexico." Animals 13, no. 11 (May 24, 2023): 1738. http://dx.doi.org/10.3390/ani13111738.

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Goat milk composition is affected by feeding, and in semiarid rangeland, information on Creole goat milk physicochemical composition is lacking. For the fulfillment of this objective, three agroecological regions (AR) considering altitude (lowland 87, highland 779, and mountain 1309 m above sea level) with different botanical compositions were chosen. Every AR analyzed accounted for 30 goat herds, with a total of 90 herds. The results demonstrated that altitude had an influence mainly on density and protein. Milk density increases as altitude increases; conversely, milk protein increases as al

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Zhu, Yanbin, Jiayi Tian, Yangji Cidan, Hongzhuang Wang, Kun Li, and Wangdui Basang. "Influence of Varied Environment Conditions on the Gut Microbiota of Yaks." Animals 14, no. 11 (May 25, 2024): 1570. http://dx.doi.org/10.3390/ani14111570.

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Despite the crucial role of the gut microbiota in different physiological processes occurring in the animal body, reports regarding the gut microbiota of animals residing in different environmental conditions like high altitude and different climate settings are limited. The Qinghai–Tibetan Plateau is renowned for its extreme climatic conditions that provide an ideal environment for exploring the effects of high altitude and temperature on the microbiota of animals. Yaks have unique oxygen delivery systems and genes related to hypoxic response. Damxung, Nyêmo, and Linzhou counties in Tibet hav

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Malfatti, Eduardo, Pedro M. A. Ferreira, and Laura R. P. Utz. "Eukaryotic Communities in Bromeliad Phytotelmata: How Do They Respond to Altitudinal Differences?" Diversity 12, no. 9 (August 28, 2020): 326. http://dx.doi.org/10.3390/d12090326.

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Bromeliad phytotelmata are habitats for different organisms and models for ecological studies. Although poorly known, these environments are widely distributed in tropical ecosystems, harboring cosmopolitan and endemic species. Here, we investigated the diversity of the eukaryotic community in bromeliad phytotelmata considering the influence of altitude. We randomly sampled three bromeliad individuals (twice per season over one year) at four altitudinal strata (20 m, 400 m, 910 m, and 915 m) through a mountain range in southern Brazil. Species richness of phytotelmata community was higher at i

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Bateman, Brooke L., Alex S. Kutt, Eric P. Vanderduys, and Jeanette E. Kemp. "Small-mammal species richness and abundance along a tropical altitudinal gradient: an Australian example." Journal of Tropical Ecology 26, no. 2 (January 29, 2010): 139–49. http://dx.doi.org/10.1017/s0266467409990460.

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Abstract:This study examined patterns in the species richness and abundance of small non-volant mammals along a tropical altitudinal gradient in north-eastern Australia. We investigated whether a mid-altitudinal peak in diversity was apparent, and if it occurred, whether it was determined by particular environmental conditions. We sampled a small-mammal assemblage at 17 sites distributed along an altitude-environmental gradient from savanna (350 m) to rain-forest vegetation (1000 m). Over four separate occasions (5100 trap-nights) we recorded 17 species of mammal with 416 captures. A positive

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Saha, Sushil, Govind-Singh Rajwar, and Munesh Kumar. "Forest structure, diversity and regeneration potential along altitudinal gradient in Dhanaulti of Garhwal Himalaya." Forest Systems 25, no. 2 (July 20, 2016): e058. http://dx.doi.org/10.5424/fs/2016252-07432.

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Aim of the study: The aim of the present study was to understatnd the forest composition, structure, diversity and regeneration potential along altitudinal gradient.Area of study: The study was carried out in Dhanaulti forest which falls under temperate region of Garhwal Himalaya in Uttarakhand state, India.Material and Methods: Vegetation analysis was carried out using 10 quadrats at each altitude using a quadrate size of 10×10 m2. In each quadrate, categories of trees >30 cm cbh were considered as trees, 10-30cm cbh as saplings and <10 cm cbh as seedlings. The data were quantitatively

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Mahari, Abraham, Clinton G. Blasin, Aberash Bekele, and Anthony T. Watson. "Exploring the Influence of Slope Gradient on Tree Species Richness and Forest Structure." Asian Journal of Biology 20, no. 3 (February 19, 2024): 25–33. http://dx.doi.org/10.9734/ajob/2024/v20i3394.

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Slope gradient is a critical environment factor influencing the abundance, distribution and diversity of vegetation. The objective of this study was to exploring the influence of slope gradient on tree species richness and forest structure in Kpatawee forest, Liberia. Tree diameter was measured at breast height for species more than 5 cm in diameter and over 3 m in height. Tree species diversity was analyzed using Shannon diversity index (Hˈ). Basal area (BA) which is the cross-sectional area of tree stems was measured through the diameter at breast height that is 1.3 m above ground level. Res

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Amelunke, Michael, Carlton P. Anderson, Margaret C. B. Waldron, George T. Raber, and Gregory A. Carter. "Influence of Flight Altitude and Surface Characteristics on UAS-LiDAR Ground Height Estimate Accuracy in Juncus roemerianus Scheele-Dominated Marshes." Remote Sensing 16, no. 2 (January 18, 2024): 384. http://dx.doi.org/10.3390/rs16020384.

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Management and monitoring of vulnerable coastal marshes rely on accurate ground height estimates. However, marsh surface characteristics such as vegetation and water presence complicate aerial remote sensing of the ground. Towards developing an improved understanding and techniques for these remote sensing efforts, this study established relationships among data collection flight altitude, surface characteristics, and ground height estimate accuracy within Juncus roemerianus Scheele-dominated marshes. Uncrewed Aerial System (UAS) Light Detection and Ranging (LiDAR) sampling was conducted at fi

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Franzén, Markus, and Petra Dieker. "The influence of terrain age and altitude on the arthropod communities found on recently deglaciated terrain." Current Zoology 60, no. 2 (April 1, 2014): 203–20. http://dx.doi.org/10.1093/czoolo/60.2.203.

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Abstract Climate warming has been more pronounced in the Arctic than elsewhere, resulting in a recent rapid glacial retreat. Over 85% of the Ålmajallojekna glacier has disappeared over the last 115 years and it is one of the fastest retreating glaciers in Sweden. In 2011 and 2012, at 18 sites in the vicinity of the remaining glacier network, we sampled arthropods and related the species richness, abundance and proportion of herbivores to altitude (ranging from 824 to 1, 524 m.a.s.l.) and the age of the site (ranging from 0 to &gt;115 years). Temperature was measured at six sites and the av

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ABADA, O., H. KBAB, and S. HAIF. "Optimizing the design of a supersonic Planar Dual Bell Nozzle (PDBN)." Kosmìčna nauka ì tehnologìâ 30, no. 2 (April 29, 2024): 15–27. http://dx.doi.org/10.15407/knit2024.02.015.

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Dual bell nozzles present a promising solution for maximizing propulsion efficiency at high altitudes, while also mitigating dangerous side loads at lower altitudes. Such nozzles are comprised of two distinct contours, with the first optimized for low altitude operation, and the second tailored for high altitude conditions. These contours are interconnected at an inflexion point. The present study focuses on optimizing the contour design of a planar dual bell nozzle. Leveraging the commercial ANSYS-Fluent software, we conducted an investigation into the influence of the inflection angle on the

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Seifert, Erich, Stefan Seifert, Holger Vogt, David Drew, Jan van Aardt, Anton Kunneke, and Thomas Seifert. "Influence of Drone Altitude, Image Overlap, and Optical Sensor Resolution on Multi-View Reconstruction of Forest Images." Remote Sensing 11, no. 10 (May 27, 2019): 1252. http://dx.doi.org/10.3390/rs11101252.

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Recent technical advances in drones make them increasingly relevant and important tools for forest measurements. However, information on how to optimally set flight parameters and choose sensor resolution is lagging behind the technical developments. Our study aims to address this gap, exploring the effects of drone flight parameters (altitude, image overlap, and sensor resolution) on image reconstruction and successful 3D point extraction. This study was conducted using video footage obtained from flights at several altitudes, sampled for images at varying frequencies to obtain forward overla

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Cook, James D., Erick Boy, Carol Flowers, and Maria del Carmen Daroca. "The influence of high-altitude living on body iron." Blood 106, no. 4 (August 15, 2005): 1441–46. http://dx.doi.org/10.1182/blood-2004-12-4782.

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Abstract The quantitative assessment of body iron based on measurements of the serum ferritin and transferrin receptor was used to examine iron status in 800 Bolivian mothers and one of their children younger than 5 years. The survey included populations living at altitudes between 156 to 3750 m. Body iron stores in the mothers averaged 3.88 ± 4.31 mg/kg (mean ± 1 SD) and 1.72 ± 4.53 mg/kg in children. No consistent effect of altitude on body iron was detected in children but body iron stores of 2.77 ± 0.70 mg/kg (mean ± 2 standard error [SE]) in women living above 3000 m was reduced by one-th

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Dotdaeva, A. A., Kh A. Kurdanov, and S. A. Boytsov. "MORBIDITY AND MORTALITY FROM CARDIOVASCULAR DISEASES ACCORDING TO THE SEA-LEVEL RELATED ALTITUDE OF A REGION." Cardiovascular Therapy and Prevention 13, no. 6 (December 28, 2014): 51–55. http://dx.doi.org/10.15829/1728-8800-2014-6-51-55.

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It is known that the common risk factors (RF) of cardiovascular diseases (CVD) do exist and do influence all people the same. Among them are arterial hypertension, smoking, total cholesterol, obesity etc. However there are specifics of RF realization connected to climatogeographic specifics, i.e. high mountain altitudes. The review is concerned on the influence of the high altitude influence on RF of CVD. Some papers show that in high altitudes inhabitants the RF of CVD were prognostically malevolent, but the level of total and coronary mortality was lower in mountain inhabitants that can be e

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Tian, Xiaomiao, Si Chen, Qiusheng Zhong, Junyu Wang, Jiedan Chen, Liang Chen, Doogyung Moon, and Jianqiang Ma. "Widely Targeted Metabolomics Analysis Reveals the Effect of Cultivation Altitude on Tea Metabolites." Agronomy 14, no. 4 (April 13, 2024): 812. http://dx.doi.org/10.3390/agronomy14040812.

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Cultivation altitude is a comprehensive environmental factor that significantly affects tea quality. To gain a deeper understanding of the effect of cultivation altitude on tea metabolites, a widely targeted metabolomic method based on ultra-performance liquid chromatography–tandem mass spectrometry (UPLC-MS/MS) was used to analyze tea samples derived from three altitudes (86 m, 256 m, and 880 m) of two cultivars, ‘Mingke 1’ (MK) and ‘Fuyun 6’ (FY). The results showed that distinct groups of tea samples from different altitudes and cultivars were observed based on PCA. A total of 64 and 56 alt

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Qin, Pengcheng, Mingnian Wang, Zhanwen Chen, Guanfeng Yan, Tao Yan, Changling Han, and Anmin Wang. "Effects of Ambient Pressure on Burning Characteristics of Gasoline: A Pilot Study." Energies 14, no. 15 (July 30, 2021): 4627. http://dx.doi.org/10.3390/en14154627.

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A fire can pose a significant threat to a building’s occupants and leads to property damage. The burning characteristics usually determine the severity of the accident. Environments in high-altitude areas feature low oxygen content and ambient pressure, which can influence the burning characteristics of combustibles. In this paper, a series of field experiments were conducted to investigate the burning characteristics of gasoline at different altitudes considering heat release rate (HRR), flame height, and smoke release rate. Results show that the combustion process can be divided into three s

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