Same-sex mounts provide male juvenile golden snub-nosed monkeys(Rhinopithecus roxellana)with opportunities to practice heterosexual copulatory skills and are often followed by grooming(post-mounting grooming,PMG).We h...Same-sex mounts provide male juvenile golden snub-nosed monkeys(Rhinopithecus roxellana)with opportunities to practice heterosexual copulatory skills and are often followed by grooming(post-mounting grooming,PMG).We hypothesized that juveniles acted as the mountee and provided mounting opportunities to receive grooming from their peer mounter.Here,we observed same-sex mounts among male juveniles(N=5)in a captive group of R.roxellana in Shanghai Wild Animal Park,China,from November 2014 to June 2015.Among 1,044 mounts recorded,45.40% were accompanied by PMG initiated by the mounter and only 3.74% were followed by PMG initiated by the mountee.Mountees were more likely to receive PMG when they performed a mounting solicitation than when they did not,or when they were mounted for a longer time(even if they did not solicit).Over a long timeframe(1 month),mountee’s tended to choose partners who groomed them more often than others after mounting,regardless of how long the grooming lasted.However,whether the mounter groomed the mountee did not predict the mounting direction in their subsequent mount.Our results suggest that,in the context of same-sex mounts,juveniles provide mounting opportunities to receive grooming from peers on a long-term,rather than on a short-term basis.This study provides the first evidence that juveniles’same-sex mounting strategy may be associated with the grooming market in nonhuman primates,which necessitates further investigation with large free-ranging groups due to the limited sample size of individuals and the captive setting of the current study.展开更多
Approximately 2,000,000 people are exposed to volcanic risks in communities situated at the flanks of Mounts Cameroon (MC) and Nyiragongo (MN) volcanoes in Central Africa. This study therefore sought to investigate ri...Approximately 2,000,000 people are exposed to volcanic risks in communities situated at the flanks of Mounts Cameroon (MC) and Nyiragongo (MN) volcanoes in Central Africa. This study therefore sought to investigate risk perception from four previous eruptions of MC, namely the 1959, 1982, 1999, and 2000 eruptions;and two previous eruptions of MN: 1977 and 2002. The study was initiated with co-design workshops held with major stakeholders in the cities of Buea and Goma at the flanks of MC and MN, respectively, in 2017, to develop the research objectives for the study. A non-random questionnaire survey was later conducted within 14 and 15 communities in Buea and Goma respectively, on the effects, perceived risks, and coping strategies for the chosen eruptions. Three age groups (18 - 30, 31 - 45 and >45 years) and gender (male and female) were considered. The population at the flanks of both volcanoes cited scientific and indigenous factors to be responsible for eruptions from these volcanoes. At MC and MN, ≥45% of the sampled participants (with a higher female population) perceived that the sampled eruptions posed a very high risk to the population. In terms of the effects, the age group of 18 - 30 was the least knowledgeable. In terms of direct effect on persons, over 90% of participants at MC and MN attested that they were overcome by fear/panic. On measures to cope with any likely eruption, the following order was established at the flanks of both volcanoes: sensitization of population, use of religious (prayers) and of traditional/indigenous strategies. In terms of future coping strategies, while the males at MC maintained sensitization as the favourite option, 62% of the males at MN opted for traditional/indigenous strategies. The female population at both MC and MN showed a higher preference for religious strategies like prayers.展开更多
In order to evaluate the ride quality of the soil compactor cab supplemented by the auxiliary hydraulic mounts (AHM), a nonlinear dynamic model of the soil compactor interacting with the off-road deformable terrain is...In order to evaluate the ride quality of the soil compactor cab supplemented by the auxiliary hydraulic mounts (AHM), a nonlinear dynamic model of the soil compactor interacting with the off-road deformable terrain is established based on Matlab/Simulink sofware. The power spectral density (PSD) and the weighted root mean square (RMS) of acceleration responses of the vertical driver s seat, the cab s pitch and roll angle are chosen as objective functions in low-frequency range. Experimental investigation is also used to verify the accuracy of the model. The influence of the damping coefficients of the AHM on the cab s ride quality is analyzed, and damping coefficients are then optimized via a genetic algorithm program. The research results show that the cab s rubber mounts added by the AHM clearly improve the ride quality under various operating conditions. Particularly, with the optimal damping coefficients of the front-end mounts c a 1,2 = 1 500 N · s/m and of the rear-end mounts c a 3,4 =2 335 N · s/m, the weighted RMS values of the driver s seat, the cab s pitch and roll angle are reduced by 22.2%, 18.8%, 58.7%, respectively. Under the condition of the vehicle travelling, with the optimal damping coefficients of c a 1,2 = 1 500 N · s/m and c a 3,4 =1 882 N · s/m, the maximum PSD values of the driver s seat, the cab s pitch and roll angle are clearly decreased by 36.7%, 54.7% and 50.6% under the condition of the vehicle working.展开更多
The paper presents a theoretical analysis of different vibration control strategies of soft mounted induction motors with sleeve bearings, using active motor foot mounts. After the vibration model is presented, differ...The paper presents a theoretical analysis of different vibration control strategies of soft mounted induction motors with sleeve bearings, using active motor foot mounts. After the vibration model is presented, different controllers in combination with different feedback strategies are mathematically investigated. The focus is here on the forced vibrations, caused by dynamic rotor eccentricity—rotor mass eccentricity, magnetic eccentricity and bent rotor deflection. After the mathematically coherences are described, a numerical example is shown, where the forced vibrations caused by bent rotor deflection are investigated, for different control strategies, where the mass matrix, the stiffness matrix and the damping matrix are influenced by different control parameters. The aim of the paper is to show the mathematically coherences and the possibility to influence the vibration behaviour, by different control strategies to optimize the vibration behaviour of soft mounted induction motors.展开更多
The existing torque roll axis(TRA) decoupling theories for a powertrain mounting system assume that the stiffness and viscous damping properties are constant. However, real-life mounts exhibit considerable spectrally ...The existing torque roll axis(TRA) decoupling theories for a powertrain mounting system assume that the stiffness and viscous damping properties are constant. However, real-life mounts exhibit considerable spectrally varying stiffness and damping characteristics, and the influence of the spectrally-varying properties of the hydraulic mounts on the powertrain system cannot be ignored. To overcome the deficiency, an analytical quasi-linear model of the hydraulic mount and the coupled properties of the powertrain and hydraulic mounts system are formulated. The influence of the hydraulic mounts on the TRA decoupling of a powertrain system is analytically examined in terms of eigensolutions, frequency, and impulse responses, and then a new analytical axiom is proposed based on the TRA decoupling indices. With the experimental setup of a fixed decoupler hydraulic mount in the context of non-resonant dynamic stiffness testing procedure, the quasi-linear model of the hydraulic mount is verified by comparing the predictions with the measurement. And the quasi-linear formulation of the coupled system is also verified by comparing the frequency responses with the numerical results obtained by the direct inversion method. Finally, the mounting system with a combination of hydraulic mounts is redesigned in terms of the stiffness, damping and mount locations by satisfying the new axiom. The frequency and time domain results of the redesigned system demonstrate that the torque roll axis of the redesigned powertrain mounting system is indeed decoupled in the presence of hydraulic mounts (given oscillating torque or impulsive torque excitation). The proposed research provides an important basis and method for the research on a powertrain system with spectrally-varying mount properties, especially for the TRA decoupling.展开更多
Based on the advantages of hydraulic and pneumatic mounts,a new hydro-pneumatic mount(HPM)is proposed to improve the low-frequency ride comfort of vibration rollers.Through the experiment of the vibratory roller,a non...Based on the advantages of hydraulic and pneumatic mounts,a new hydro-pneumatic mount(HPM)is proposed to improve the low-frequency ride comfort of vibration rollers.Through the experiment of the vibratory roller,a nonlinear vehicle dynamic model working on off-road soil grounds is then established to assess the HPM's ride comfort in the low-frequency region.Two indices,the power spectral density(PSD)acceleration and root mean square(RMS)acceleration of the operator vibration and cab shaking,are chosen as objective functions in both the frequency and time regions.The research results show that when the cab isolations are equipped with the HPM,the RMS values of the operator's seat,cab's pitch and roll angles are reduced by 35%,42%and 53%;and the maximum PSD of the operator's seat,cab's pitch and roll angles are decreased by 39%,59%and 65%,respectively.Consequently,the characteristics of the nonlinear damper and high-static stiffness of HPM can greatly reduce the operator vibration and cab shaking in the low-frequency region when compared to the vibratory roller's cab using the rubber mounts.展开更多
Petrogeochemical analysis of mafic rocks of Fouimba and Goma Mount in the Séguéla region (central-western Côte d’Ivoire) is the subject of this study. This analysis combines remote sensing, geophysics,...Petrogeochemical analysis of mafic rocks of Fouimba and Goma Mount in the Séguéla region (central-western Côte d’Ivoire) is the subject of this study. This analysis combines remote sensing, geophysics, petrography and geochemistry, in order to determine the major characteristics of the mafic formations in the said area, and above all to participate in the detailed mapping of all the Ivorian terrains. The mafic formations encountered in this region are essentially metatonalites to metadiorites, amphibolites, amphibole bearing pyroxenites and porphyry basalts. Chemical analysis indicates that these mafic formations are tonalitic to monzonitic. They are thought to have derived from mantle depleted magmas.展开更多
On January 15,the launch ceremony of 2025“One River,One Family”Spring Festival cultural series in Laos was held in the Lao capital of Vientiane.Distinguished vips present at and addressing the ceremony included Vi...On January 15,the launch ceremony of 2025“One River,One Family”Spring Festival cultural series in Laos was held in the Lao capital of Vientiane.Distinguished vips present at and addressing the ceremony included Vilavone Phanhthavong,deputy head of the Publicity and Training Board of the Lao People’s Revolutionary Party(LPRP)Central Committee,Vansay Tavinyan,deputy head of the Publicity and Training Board of the LPRP Central Committee and editor-in-chief of Pasaxon newspaper,Savankhone Razmountry,president of the Lao Journalists’Association.展开更多
The Shiquanhe River,like a dynamic young man,roars all the way from the glacial lake on the northern side of Mount Gang Rinpoche to the Shiquanhe river basin.There,the water gradually slows and kindly moistens the sur...The Shiquanhe River,like a dynamic young man,roars all the way from the glacial lake on the northern side of Mount Gang Rinpoche to the Shiquanhe river basin.There,the water gradually slows and kindly moistens the surrounding grasslands,presenting a lush and picturesque landscape.展开更多
As 2025 unfolds,global economic growth remains lackluster,protectionism is intensifying,and key markets are grappling with weak growth prospects and mounting debt burdens.As the external environment grows ever more un...As 2025 unfolds,global economic growth remains lackluster,protectionism is intensifying,and key markets are grappling with weak growth prospects and mounting debt burdens.As the external environment grows ever more uncertain and unstable,China is poised at a pivotal crossroads in its economic transformation.展开更多
For decades,antigen presentation on major histocompatibility complex class I for T cell-mediated immunity has been considered the primary function of proteasome-derived peptides1,2.However,whether the products of prot...For decades,antigen presentation on major histocompatibility complex class I for T cell-mediated immunity has been considered the primary function of proteasome-derived peptides1,2.However,whether the products of proteasomal degradation play additional parts in mounting immune responses remains unknown.Antimicrobial peptides serve as a first line of defence against invading pathogens before the adaptive immune system responds.Although the protective function of antimicrobial peptides across numerous tissues is well established,the cellular mechanisms underlying their generation are not fully understood.Here we uncover a role for proteasomes in the constitutive and bacterial-induced generation of defence peptides that impede bacterial growth both in vitro and in vivo by disrupting bacterial membranes.In silico prediction of proteome-wide proteasomal cleavage identified hundreds of thousands of potential proteasome-derived defence peptides with cationic properties that may be generated en route to degradation to act as a first line of defence.展开更多
The government work report demonstrates China’s resolve and confidence to surmount all difficulties to break new ground amidst profound changes.AS an important window into China’s economic policy direction,the signi...The government work report demonstrates China’s resolve and confidence to surmount all difficulties to break new ground amidst profound changes.AS an important window into China’s economic policy direction,the significance of the“two sessions”becomes even more prominent in a time of increasing geopolitical tension.展开更多
Shanxi,where the essence of its mountains and rivers converge,is a treasure trove of cultural and travel marvels.In the timeless embrace of ancient Pingyao,the legacy of Jin merchants echoes through the ages.The Yunga...Shanxi,where the essence of its mountains and rivers converge,is a treasure trove of cultural and travel marvels.In the timeless embrace of ancient Pingyao,the legacy of Jin merchants echoes through the ages.The Yungang Grottoes,with their solemn Buddhas,stand as timeless sentinels,whispering tales of a millennium's passage.On the sacred slopes of Mount Wutai,the air is scented with incense,and the tranquil spirit of Zen envelops the misty landscape.Journey back to the heart of the Three Jins,where the aroma of aged vinegar lingers in the air,and hidden vistas reveal their profound beauty.Here,you will discover a charm and character like no other,as the spirit of the land unveils its unique poetic elegance and grace.展开更多
Plato’s grave柏拉图的坟墓In 79 AD,Mount Vesuvius covered the Herculaneum scrolls^(1).Scientists now use smart tools to read them,learning about Plato’s life,death at 81,and where he was buried^(2).This discovery tea...Plato’s grave柏拉图的坟墓In 79 AD,Mount Vesuvius covered the Herculaneum scrolls^(1).Scientists now use smart tools to read them,learning about Plato’s life,death at 81,and where he was buried^(2).This discovery teaches us more about the past.展开更多
The optical absorption of large molecular compounds HULIS(humic-like substances)can significantly impact the aerosol light absorption and radiative forcing,influencing cloud condensation nuclei formation and thus the ...The optical absorption of large molecular compounds HULIS(humic-like substances)can significantly impact the aerosol light absorption and radiative forcing,influencing cloud condensation nuclei formation and thus the climate and atmospheric environment.This study collected aerosol(PM_(2.5))samples from the summit of Mount Tai in North China to investigate the concentration,molecular composition,and optical properties of HULIS.The average concentration of HULIS in the PM_(2.5) in this study was 1.26±0.54μg/m^(3),comprising for 56%of the water-soluble organic carbon(WSOC),with levels lower than urban areas but higher than other mountainous regions.Mass spectrometry revealed that CHO and CHON components,with high aromaticity and phenolic groups,are major contributors to absorption and fluorescence.These results indicate that HULIS is mainly composed of lignin and proteins/amino sugars,derived from combustion and secondary formation,and possesses a high light absorption capacity(withMAE365(mass absorption efficiency)and AAE(A˚ngstrom exponent)indices of 0.62m^(2)/g and 4.99,respectively).Parallel factor analysis identified three fluorescence components of HULIS,with proportions of 60.8%for less oxygen humic-like substances,21.0%for high oxygen humic-like substances,and 18.2%for protein-like substances.Our study highlights the significance of the light-absorbing capacity and secondary formation of HULIS at Mount Tai,laying the groundwork for investigation into the climate effects,formation mechanisms,and sources of HULIS generation.展开更多
Aerosol category and its physicochemical properties are key factors influencing its climate and environmental effects.To further enhance our understanding of aerosols in the Himalayas-Tibetan Plateau region,atmospheri...Aerosol category and its physicochemical properties are key factors influencing its climate and environmental effects.To further enhance our understanding of aerosols in the Himalayas-Tibetan Plateau region,atmospheric particulate matter samples were collected at three different altitudes on Mount Qomolangma(Everest).Using an automated scanning electron microscope system,the composition,size,and morphology of 52,349 particles were analyzed.The average mass concentrations of PM_(1),PM_(2.5),and PM_(10)were 0.678,5.054,and 16.698μg/m^(3),respectively.Aluminosilicate particles dominated the samples,accounting for 71.5%to 82.8%of PM_(10)mass and 34.7%to 62.4%of the particle number.Quartz particles,carbonate particles,metal oxides,and sulfates were also observed at different periods.Carbonaceous particles made up a significant portion of aerosols,comprising 2.1%to 9.7%of PM_(10)mass and 10.4%to 45.4%of particle number,with their concentration showing an upward trend with altitude.Small amounts of tar ball particles and fly ash particles were also observed,providing direct evidence of anthropogenic influences on high-altitude regions,even at altitudes exceeding 6000 m.The size distribution and abundance of different particle categories were closely related to the transport trajectories of air masses.The morphology of different particle categories varied,with fly ash particles mainly spherical and carbonaceous particles exhibiting higher irregularity.展开更多
Mount Tai Scenic Area has achieved certain results in the construction of accessible tourism facilities,realizing the exploration of digital and intelligent transformation in traditional mountain scenic areas.In this ...Mount Tai Scenic Area has achieved certain results in the construction of accessible tourism facilities,realizing the exploration of digital and intelligent transformation in traditional mountain scenic areas.In this study,using questionnaire surveys and in-depth interviews,the development of accessible tourism in Mount Tai Scenic Area was investigated and analyzed.Some countermeasures were put forward,including strengthening information guidance services,enhancing awareness and skills in accessibility services,improving feedback mechanisms for continuous refinement,and strengthening collaborations in the fields of the disabled and accessibility development,aiming to further promote humanistic care and enhance service satisfaction at the scenic area.展开更多
Over the past decades,the expansion of natu-ral secondary forests has played a crucial role in offsetting the loss of primary forests and combating climate change.Despite this,there is a gap in our understanding of ho...Over the past decades,the expansion of natu-ral secondary forests has played a crucial role in offsetting the loss of primary forests and combating climate change.Despite this,there is a gap in our understanding of how tree species’growth and mortality patterns vary with eleva-tion in these secondary forests.In this study,we analyzed data from two censuses(spanning a five-year interval)conducted in both evergreen broadleaved forests(EBF)and temperate coniferous forests(TCF),which have been recovering for half a century,across elevation gradients in a subtropical mountain region,Mount Wuyi,China.The results indicated that the relative growth rate(RGR)of EBF(0.028±0.001 cm·cm^(-1)·a^(-1))and the mortality rate(MR)(20.03%±1.70%)were 27.3%and 16.4%higher,respec-tively,than those of TCF.Interestingly,the trade-off between RGR and MR in EBF weakened as elevation increased,a trend not observed in TCF.Conversely,TCF consistently showed a stronger trade-off between RGR and MR compared to EBF.Generalized linear mixed models revealed that ele-vation influences RGR both directly and indirectly through its interactions with slope,crown competition index(CCI),and tree canopy height(CH).However,tree mortality did not show a significant correlation with elevation.Additionally,DBH significantly influenced both tree growth and mortal-ity,whereas and CH and CCI had opposite effects on tree growth between EBF and TCF.Our study underscores the importance of elevation in shaping the population dynamics and the biomass carbon sink balance of mountain forests.These insights enhance our understanding of tree species’life strategies,enabling more accurate predictions of forest dynamics and their response to environmental changes.展开更多
Indian Pilgrimage in China's Xizang to Resume This Summer Indian pilgrimage to Mount Gang Rinpoche and Lake Mapham Yutso in the Xizang Autonomous Region will resume this summer as agreed between the two countries,...Indian Pilgrimage in China's Xizang to Resume This Summer Indian pilgrimage to Mount Gang Rinpoche and Lake Mapham Yutso in the Xizang Autonomous Region will resume this summer as agreed between the two countries,according to China's Foreign Ministry.Mount Gang Rinpoche and Lake Mapham Yutso are the sacred mountain and lake for believers of several religions,including Tibetan Buddhism and Hinduism,and thus the pilgrimage is an important part of the cultural and people-to-people exchange between China and India.展开更多
On a summer morning in Boqiang Village,tucked beneath the emerald mountains of Fanshi County,Shanxi Province,the Ultra Trail Mount Wutai 2025 commenced with the sound of the starting pistol-an event that was much more...On a summer morning in Boqiang Village,tucked beneath the emerald mountains of Fanshi County,Shanxi Province,the Ultra Trail Mount Wutai 2025 commenced with the sound of the starting pistol-an event that was much more than just a competition.As soon as the colourful smoke bombs lit up the sky,some 2,000 runners from China and abroad set off to reach one of the country’s most sacred Buddhist peaks.Over the past decade,this race has become a fixture on the global running calendar and a symbol of the growing popularity of endurance sports.展开更多
基金financially supported by the National Natural Science Foundation of China(31901083,31872250,and 31401985)the China Postdoctoral Science Foundation(2019M663796).
文摘Same-sex mounts provide male juvenile golden snub-nosed monkeys(Rhinopithecus roxellana)with opportunities to practice heterosexual copulatory skills and are often followed by grooming(post-mounting grooming,PMG).We hypothesized that juveniles acted as the mountee and provided mounting opportunities to receive grooming from their peer mounter.Here,we observed same-sex mounts among male juveniles(N=5)in a captive group of R.roxellana in Shanghai Wild Animal Park,China,from November 2014 to June 2015.Among 1,044 mounts recorded,45.40% were accompanied by PMG initiated by the mounter and only 3.74% were followed by PMG initiated by the mountee.Mountees were more likely to receive PMG when they performed a mounting solicitation than when they did not,or when they were mounted for a longer time(even if they did not solicit).Over a long timeframe(1 month),mountee’s tended to choose partners who groomed them more often than others after mounting,regardless of how long the grooming lasted.However,whether the mounter groomed the mountee did not predict the mounting direction in their subsequent mount.Our results suggest that,in the context of same-sex mounts,juveniles provide mounting opportunities to receive grooming from peers on a long-term,rather than on a short-term basis.This study provides the first evidence that juveniles’same-sex mounting strategy may be associated with the grooming market in nonhuman primates,which necessitates further investigation with large free-ranging groups due to the limited sample size of individuals and the captive setting of the current study.
文摘Approximately 2,000,000 people are exposed to volcanic risks in communities situated at the flanks of Mounts Cameroon (MC) and Nyiragongo (MN) volcanoes in Central Africa. This study therefore sought to investigate risk perception from four previous eruptions of MC, namely the 1959, 1982, 1999, and 2000 eruptions;and two previous eruptions of MN: 1977 and 2002. The study was initiated with co-design workshops held with major stakeholders in the cities of Buea and Goma at the flanks of MC and MN, respectively, in 2017, to develop the research objectives for the study. A non-random questionnaire survey was later conducted within 14 and 15 communities in Buea and Goma respectively, on the effects, perceived risks, and coping strategies for the chosen eruptions. Three age groups (18 - 30, 31 - 45 and >45 years) and gender (male and female) were considered. The population at the flanks of both volcanoes cited scientific and indigenous factors to be responsible for eruptions from these volcanoes. At MC and MN, ≥45% of the sampled participants (with a higher female population) perceived that the sampled eruptions posed a very high risk to the population. In terms of the effects, the age group of 18 - 30 was the least knowledgeable. In terms of direct effect on persons, over 90% of participants at MC and MN attested that they were overcome by fear/panic. On measures to cope with any likely eruption, the following order was established at the flanks of both volcanoes: sensitization of population, use of religious (prayers) and of traditional/indigenous strategies. In terms of future coping strategies, while the males at MC maintained sensitization as the favourite option, 62% of the males at MN opted for traditional/indigenous strategies. The female population at both MC and MN showed a higher preference for religious strategies like prayers.
基金The Science and Technology Support Program of Jiangsu Province(No.BE2014133)the Prospective Joint Research Program of Jiangsu Province(No.BY2014127-01)
文摘In order to evaluate the ride quality of the soil compactor cab supplemented by the auxiliary hydraulic mounts (AHM), a nonlinear dynamic model of the soil compactor interacting with the off-road deformable terrain is established based on Matlab/Simulink sofware. The power spectral density (PSD) and the weighted root mean square (RMS) of acceleration responses of the vertical driver s seat, the cab s pitch and roll angle are chosen as objective functions in low-frequency range. Experimental investigation is also used to verify the accuracy of the model. The influence of the damping coefficients of the AHM on the cab s ride quality is analyzed, and damping coefficients are then optimized via a genetic algorithm program. The research results show that the cab s rubber mounts added by the AHM clearly improve the ride quality under various operating conditions. Particularly, with the optimal damping coefficients of the front-end mounts c a 1,2 = 1 500 N · s/m and of the rear-end mounts c a 3,4 =2 335 N · s/m, the weighted RMS values of the driver s seat, the cab s pitch and roll angle are reduced by 22.2%, 18.8%, 58.7%, respectively. Under the condition of the vehicle travelling, with the optimal damping coefficients of c a 1,2 = 1 500 N · s/m and c a 3,4 =1 882 N · s/m, the maximum PSD values of the driver s seat, the cab s pitch and roll angle are clearly decreased by 36.7%, 54.7% and 50.6% under the condition of the vehicle working.
文摘The paper presents a theoretical analysis of different vibration control strategies of soft mounted induction motors with sleeve bearings, using active motor foot mounts. After the vibration model is presented, different controllers in combination with different feedback strategies are mathematically investigated. The focus is here on the forced vibrations, caused by dynamic rotor eccentricity—rotor mass eccentricity, magnetic eccentricity and bent rotor deflection. After the mathematically coherences are described, a numerical example is shown, where the forced vibrations caused by bent rotor deflection are investigated, for different control strategies, where the mass matrix, the stiffness matrix and the damping matrix are influenced by different control parameters. The aim of the paper is to show the mathematically coherences and the possibility to influence the vibration behaviour, by different control strategies to optimize the vibration behaviour of soft mounted induction motors.
基金supported by National Natural Science Foundation of China (Grant Nos. 51075112, 51175135)Fundamental Research Funds for the Central Universities of China (Grant Nos. 2012HGBZ0618,2013HGBH0008)
文摘The existing torque roll axis(TRA) decoupling theories for a powertrain mounting system assume that the stiffness and viscous damping properties are constant. However, real-life mounts exhibit considerable spectrally varying stiffness and damping characteristics, and the influence of the spectrally-varying properties of the hydraulic mounts on the powertrain system cannot be ignored. To overcome the deficiency, an analytical quasi-linear model of the hydraulic mount and the coupled properties of the powertrain and hydraulic mounts system are formulated. The influence of the hydraulic mounts on the TRA decoupling of a powertrain system is analytically examined in terms of eigensolutions, frequency, and impulse responses, and then a new analytical axiom is proposed based on the TRA decoupling indices. With the experimental setup of a fixed decoupler hydraulic mount in the context of non-resonant dynamic stiffness testing procedure, the quasi-linear model of the hydraulic mount is verified by comparing the predictions with the measurement. And the quasi-linear formulation of the coupled system is also verified by comparing the frequency responses with the numerical results obtained by the direct inversion method. Finally, the mounting system with a combination of hydraulic mounts is redesigned in terms of the stiffness, damping and mount locations by satisfying the new axiom. The frequency and time domain results of the redesigned system demonstrate that the torque roll axis of the redesigned powertrain mounting system is indeed decoupled in the presence of hydraulic mounts (given oscillating torque or impulsive torque excitation). The proposed research provides an important basis and method for the research on a powertrain system with spectrally-varying mount properties, especially for the TRA decoupling.
基金The National Key Research and Development Plan(No.2019YFB2006402)Talent Introduction Fund Project of Hubei Polytechnic University(No.19XJK17R)the Joint Key Project Founded by Southeast University and Nanjing Medical University(No.2019DN0011)。
文摘Based on the advantages of hydraulic and pneumatic mounts,a new hydro-pneumatic mount(HPM)is proposed to improve the low-frequency ride comfort of vibration rollers.Through the experiment of the vibratory roller,a nonlinear vehicle dynamic model working on off-road soil grounds is then established to assess the HPM's ride comfort in the low-frequency region.Two indices,the power spectral density(PSD)acceleration and root mean square(RMS)acceleration of the operator vibration and cab shaking,are chosen as objective functions in both the frequency and time regions.The research results show that when the cab isolations are equipped with the HPM,the RMS values of the operator's seat,cab's pitch and roll angles are reduced by 35%,42%and 53%;and the maximum PSD of the operator's seat,cab's pitch and roll angles are decreased by 39%,59%and 65%,respectively.Consequently,the characteristics of the nonlinear damper and high-static stiffness of HPM can greatly reduce the operator vibration and cab shaking in the low-frequency region when compared to the vibratory roller's cab using the rubber mounts.
文摘Petrogeochemical analysis of mafic rocks of Fouimba and Goma Mount in the Séguéla region (central-western Côte d’Ivoire) is the subject of this study. This analysis combines remote sensing, geophysics, petrography and geochemistry, in order to determine the major characteristics of the mafic formations in the said area, and above all to participate in the detailed mapping of all the Ivorian terrains. The mafic formations encountered in this region are essentially metatonalites to metadiorites, amphibolites, amphibole bearing pyroxenites and porphyry basalts. Chemical analysis indicates that these mafic formations are tonalitic to monzonitic. They are thought to have derived from mantle depleted magmas.
文摘On January 15,the launch ceremony of 2025“One River,One Family”Spring Festival cultural series in Laos was held in the Lao capital of Vientiane.Distinguished vips present at and addressing the ceremony included Vilavone Phanhthavong,deputy head of the Publicity and Training Board of the Lao People’s Revolutionary Party(LPRP)Central Committee,Vansay Tavinyan,deputy head of the Publicity and Training Board of the LPRP Central Committee and editor-in-chief of Pasaxon newspaper,Savankhone Razmountry,president of the Lao Journalists’Association.
文摘The Shiquanhe River,like a dynamic young man,roars all the way from the glacial lake on the northern side of Mount Gang Rinpoche to the Shiquanhe river basin.There,the water gradually slows and kindly moistens the surrounding grasslands,presenting a lush and picturesque landscape.
文摘As 2025 unfolds,global economic growth remains lackluster,protectionism is intensifying,and key markets are grappling with weak growth prospects and mounting debt burdens.As the external environment grows ever more uncertain and unstable,China is poised at a pivotal crossroads in its economic transformation.
文摘For decades,antigen presentation on major histocompatibility complex class I for T cell-mediated immunity has been considered the primary function of proteasome-derived peptides1,2.However,whether the products of proteasomal degradation play additional parts in mounting immune responses remains unknown.Antimicrobial peptides serve as a first line of defence against invading pathogens before the adaptive immune system responds.Although the protective function of antimicrobial peptides across numerous tissues is well established,the cellular mechanisms underlying their generation are not fully understood.Here we uncover a role for proteasomes in the constitutive and bacterial-induced generation of defence peptides that impede bacterial growth both in vitro and in vivo by disrupting bacterial membranes.In silico prediction of proteome-wide proteasomal cleavage identified hundreds of thousands of potential proteasome-derived defence peptides with cationic properties that may be generated en route to degradation to act as a first line of defence.
文摘The government work report demonstrates China’s resolve and confidence to surmount all difficulties to break new ground amidst profound changes.AS an important window into China’s economic policy direction,the significance of the“two sessions”becomes even more prominent in a time of increasing geopolitical tension.
文摘Shanxi,where the essence of its mountains and rivers converge,is a treasure trove of cultural and travel marvels.In the timeless embrace of ancient Pingyao,the legacy of Jin merchants echoes through the ages.The Yungang Grottoes,with their solemn Buddhas,stand as timeless sentinels,whispering tales of a millennium's passage.On the sacred slopes of Mount Wutai,the air is scented with incense,and the tranquil spirit of Zen envelops the misty landscape.Journey back to the heart of the Three Jins,where the aroma of aged vinegar lingers in the air,and hidden vistas reveal their profound beauty.Here,you will discover a charm and character like no other,as the spirit of the land unveils its unique poetic elegance and grace.
文摘Plato’s grave柏拉图的坟墓In 79 AD,Mount Vesuvius covered the Herculaneum scrolls^(1).Scientists now use smart tools to read them,learning about Plato’s life,death at 81,and where he was buried^(2).This discovery teaches us more about the past.
基金supported by the National Natural Science Foundation of China(Nos.22176112 and 42307134)the Natural Science Foundation of Shandong Province(No.ZR2021MD028)the Natural Science Foundation of Qingdao(No.23–2-1–74-zyyd-jch).
文摘The optical absorption of large molecular compounds HULIS(humic-like substances)can significantly impact the aerosol light absorption and radiative forcing,influencing cloud condensation nuclei formation and thus the climate and atmospheric environment.This study collected aerosol(PM_(2.5))samples from the summit of Mount Tai in North China to investigate the concentration,molecular composition,and optical properties of HULIS.The average concentration of HULIS in the PM_(2.5) in this study was 1.26±0.54μg/m^(3),comprising for 56%of the water-soluble organic carbon(WSOC),with levels lower than urban areas but higher than other mountainous regions.Mass spectrometry revealed that CHO and CHON components,with high aromaticity and phenolic groups,are major contributors to absorption and fluorescence.These results indicate that HULIS is mainly composed of lignin and proteins/amino sugars,derived from combustion and secondary formation,and possesses a high light absorption capacity(withMAE365(mass absorption efficiency)and AAE(A˚ngstrom exponent)indices of 0.62m^(2)/g and 4.99,respectively).Parallel factor analysis identified three fluorescence components of HULIS,with proportions of 60.8%for less oxygen humic-like substances,21.0%for high oxygen humic-like substances,and 18.2%for protein-like substances.Our study highlights the significance of the light-absorbing capacity and secondary formation of HULIS at Mount Tai,laying the groundwork for investigation into the climate effects,formation mechanisms,and sources of HULIS generation.
基金supported by the Second Tibetan Plateau Scientific Expedition and Research(STEP)program(No.2019QZKK0106)the Basic Research Fund of CAMS(Nos.2023Z004 and 2023Z015).
文摘Aerosol category and its physicochemical properties are key factors influencing its climate and environmental effects.To further enhance our understanding of aerosols in the Himalayas-Tibetan Plateau region,atmospheric particulate matter samples were collected at three different altitudes on Mount Qomolangma(Everest).Using an automated scanning electron microscope system,the composition,size,and morphology of 52,349 particles were analyzed.The average mass concentrations of PM_(1),PM_(2.5),and PM_(10)were 0.678,5.054,and 16.698μg/m^(3),respectively.Aluminosilicate particles dominated the samples,accounting for 71.5%to 82.8%of PM_(10)mass and 34.7%to 62.4%of the particle number.Quartz particles,carbonate particles,metal oxides,and sulfates were also observed at different periods.Carbonaceous particles made up a significant portion of aerosols,comprising 2.1%to 9.7%of PM_(10)mass and 10.4%to 45.4%of particle number,with their concentration showing an upward trend with altitude.Small amounts of tar ball particles and fly ash particles were also observed,providing direct evidence of anthropogenic influences on high-altitude regions,even at altitudes exceeding 6000 m.The size distribution and abundance of different particle categories were closely related to the transport trajectories of air masses.The morphology of different particle categories varied,with fly ash particles mainly spherical and carbonaceous particles exhibiting higher irregularity.
基金Sponsored by Tai’an Science and Technology Innovation Development Project(Policy Guidance Category)(2024ZC042)Research Project of Inner Mongolia Autonomous Region Center for the Theoretical System of Socialism with Chinese Characteristics(2024ZZB018).
文摘Mount Tai Scenic Area has achieved certain results in the construction of accessible tourism facilities,realizing the exploration of digital and intelligent transformation in traditional mountain scenic areas.In this study,using questionnaire surveys and in-depth interviews,the development of accessible tourism in Mount Tai Scenic Area was investigated and analyzed.Some countermeasures were put forward,including strengthening information guidance services,enhancing awareness and skills in accessibility services,improving feedback mechanisms for continuous refinement,and strengthening collaborations in the fields of the disabled and accessibility development,aiming to further promote humanistic care and enhance service satisfaction at the scenic area.
基金funded by the National Natural Science Foundation of China(Grant No.32271872).
文摘Over the past decades,the expansion of natu-ral secondary forests has played a crucial role in offsetting the loss of primary forests and combating climate change.Despite this,there is a gap in our understanding of how tree species’growth and mortality patterns vary with eleva-tion in these secondary forests.In this study,we analyzed data from two censuses(spanning a five-year interval)conducted in both evergreen broadleaved forests(EBF)and temperate coniferous forests(TCF),which have been recovering for half a century,across elevation gradients in a subtropical mountain region,Mount Wuyi,China.The results indicated that the relative growth rate(RGR)of EBF(0.028±0.001 cm·cm^(-1)·a^(-1))and the mortality rate(MR)(20.03%±1.70%)were 27.3%and 16.4%higher,respec-tively,than those of TCF.Interestingly,the trade-off between RGR and MR in EBF weakened as elevation increased,a trend not observed in TCF.Conversely,TCF consistently showed a stronger trade-off between RGR and MR compared to EBF.Generalized linear mixed models revealed that ele-vation influences RGR both directly and indirectly through its interactions with slope,crown competition index(CCI),and tree canopy height(CH).However,tree mortality did not show a significant correlation with elevation.Additionally,DBH significantly influenced both tree growth and mortal-ity,whereas and CH and CCI had opposite effects on tree growth between EBF and TCF.Our study underscores the importance of elevation in shaping the population dynamics and the biomass carbon sink balance of mountain forests.These insights enhance our understanding of tree species’life strategies,enabling more accurate predictions of forest dynamics and their response to environmental changes.
文摘Indian Pilgrimage in China's Xizang to Resume This Summer Indian pilgrimage to Mount Gang Rinpoche and Lake Mapham Yutso in the Xizang Autonomous Region will resume this summer as agreed between the two countries,according to China's Foreign Ministry.Mount Gang Rinpoche and Lake Mapham Yutso are the sacred mountain and lake for believers of several religions,including Tibetan Buddhism and Hinduism,and thus the pilgrimage is an important part of the cultural and people-to-people exchange between China and India.
文摘On a summer morning in Boqiang Village,tucked beneath the emerald mountains of Fanshi County,Shanxi Province,the Ultra Trail Mount Wutai 2025 commenced with the sound of the starting pistol-an event that was much more than just a competition.As soon as the colourful smoke bombs lit up the sky,some 2,000 runners from China and abroad set off to reach one of the country’s most sacred Buddhist peaks.Over the past decade,this race has become a fixture on the global running calendar and a symbol of the growing popularity of endurance sports.
