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A novel point source oxygen supply method for sleeping environment improvement at high altitudes

Building Simulation 2021年第6期14卷 1843-1860页

作者： Yanfeng Liu Zhiyuan Song Cong Song Dengjia Wang State Key Laboratory of Green Building in Western China Xi'an University of Architecture and TechnologyXi'anShaanxi 710055China School of Building Services Science and Engineering Xi'an University of Architecture and TechnologyXi'anShaanxi 710055China

The hypoxic environment at high altitudes causes various sleep *** oxygen enrichment is an effective way to alleviate sleep disorders and improve the built environment in high altitude *** this study,a novel point source local diffuse oxygen supply method was proposed to improve the sleeping oxygen *** oxygen supply performance was investigated by the computational fluid dynamics(CFD)method including the oxygen concentration and air velocity distributions.A sleeping experiment was conducted on the plateau to validate the CFD *** occupied zone including the inhalation zone and the active zone was *** results showed that the oxygen concentration showed a rapid rise,then decreased slowly,and finally tended to be *** oxygen concentration after stabilization was remarkably influenced by indoor ventilation *** sleeping environment’s improvement was examined considering the oxygen enrichment efficiency,uniformity,stability and human comfort *** optimal strategies were recommended with a ventilation rate of 1 air change per hour,supplied oxygen concentration of 90%;and jet distance of 0.50 *** study contributes to improving the oxygen environment and human sleep quality in an effective and energy-saving approach to the sustainable development of buildings in high altitude areas.

关键词： oxygen supply indoor airflow built environment CFD method high altitudes

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Serum testosterone levels and excessive erythrocytosis during the process of adaptation to high altitudes

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Asian Journal of Andrology 2013年第3期15卷 368-374页

作者： Gustavo F Gonzales high Altitude Research Institute and Department of Biological and Physiological Sciences Faculty of Sciences and Philosophy Universidad Peruana Cayetano Heredia Lima 31 Peru

Populations living at high altitudes （HAs）, particularly in the Peruvian Andes, are characterized by a mixture of subjects with erythrocytosis （16 g dl-1〈haemoglobin （Hb）≤21 gdl-1） and others with excessive erythrocytosis （EE）（Hb〉21 g dl-1）. Elevated haemoglobin values （EE） are associated with chronic mountain sickness, a condition reflecting the lack of adaptation to HA. According to current data, native men from regions of HA are not adequately adapted to live at such altitudes if they have elevated serum testosterone levels. This seems to be due to an increased conversion of dehydroepiandrosterone sulphate （DH EAS） to testosterone. Men with erythrocytosis at HAs show higher serum androstenedione levels and a lower testosterone/androstenedione ratio than men with EE, suggesting reduced 17beta-hydroxysteroid dehydrogenase （17beta-HSD） activity. Lower 17beta-HSD activity via A4-steroid production in men with erythrocytosis at HA may protect against elevated serum testosterone levels, thus preventing EE. The higher conversion of DHEAS to testosterone in subjects with EE indicates increased 17beta-HSD activity via the A5-pathway. Currently, there are various situations in which people live （human biodiversity） with low or high haemoglobin levels at HA. Antiquity could be an important adaptation component for life at HA, and testosterone seems to participate in this process.

关键词： chronic mountain sickness DHEA haemoglobin high altitudes men oestradiol women

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Spatial-temporal Variation of Air Temperature for the Recent 40 Years in Lhasa

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Meteorological and Environmental Research 2021年第1期12卷 6-12页

作者： Yang LEI Hongbin WANG Baixue YU Wenxue FU Tongsuo LU Xinyu LIU Dong WEI School of Science Tibet UniversityLhasa 850000China Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China School of Technology Tibet UniversityLhasa 850000China Lhasa Meteorological Service Lhasa 850000China

It was all known that Lhasa went through a high temperature of 30.8℃in late June 2019,which hit record *** better understand the reasons,based on observations recorded at automatic weather stations in Lhasa,the characteristics of temperature variation at multiple time scales were studied using the linear trend method,Mann-Kendall mutation test,Morlet wavelet analysis,R/S analysis and so *** results showed that:(a)the annual mean temperature(AMT)is rising at a rate of 0.5℃/10 a,and the average temperature for different seasons also increased significantly,especially in winter.(b)Although there was an intersection in 1995,it was found that AMT,did not pass the reliability test of significance levelα=0.05,this means there are no abrupt changes for AMT,the values are 7.97 and 9.15℃respectively before and after the intersection point.(c)AMT has a periodic oscillation for 18-25 and 25-32 a based on a mass of data and the wavelet variance diagrams in *** has a main cycle of 28 a,cyclic patterns of temperature changes in spring,summer and autumn is similar to AMT,but it is relatively complex in winter.(d)The Hurst index of AMT and different seasons demonstrates that the temperature is likely to continue to rise in the future in Lhasa.

关键词： Global warming An abrupt change of temperature The correlation coefficient high altitudes The Tibetan Plateau Morlet wavelet analysis

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