China’s Dongfang Electric Machinery successfully completed the manufacturing of the first batch of embedded components for six turbines it is supplying for the Koysha Hydroelectric Dam project in Ethiopia.Transported...China’s Dongfang Electric Machinery successfully completed the manufacturing of the first batch of embedded components for six turbines it is supplying for the Koysha Hydroelectric Dam project in Ethiopia.Transported by land and sea,these parts will arrive on site in three months.Once completed,the power plant will generate more than 6 billion kwh of electricity annually,reducing carbon dioxide emissions by 1 million tonnes per year.展开更多
The rapid evolution and expanding scale of AI(artificial intelligence)technologies exert unprecedented energy demands on global electrical grids.Powering computationally intensive tasks such as large-scale AI model tr...The rapid evolution and expanding scale of AI(artificial intelligence)technologies exert unprecedented energy demands on global electrical grids.Powering computationally intensive tasks such as large-scale AI model training and widespread real-time inference necessitates substantial electricity consumption,presenting a significant challenge to conventional power infrastructure.This paper examines the critical need for a fundamental shift towards smart energy grids in response to AI’s growing energy footprint.It delves into the symbiotic relationship wherein AI acts as a significant energy consumer while offering the intelligence required for dynamic load management,efficient integration of renewable energy sources,and optimized grid operations.We posit that advanced smart grids are indispensable for facilitating AI’s sustainable growth,underscoring this synergy as a pivotal advancement toward a resilient energy future.展开更多
On 26 July,a parallel session of the Seventh China-Africa People's Forum&the Seventh China-Africa Young Leaders Forum-Forum on Youth Development,Innovation and Entrepreneurship was held in Yiyang.
Uganda launches giant China-constructed hydropower plant to bolster its electricity supply,and also assist South Sudan with theirs Ugandans and South Sudanese have had their lives lit up by the steady flow of electric...Uganda launches giant China-constructed hydropower plant to bolster its electricity supply,and also assist South Sudan with theirs Ugandans and South Sudanese have had their lives lit up by the steady flow of electricity from a massive hydropower infrastructure project,constructed by one of China’s leading contractors.展开更多
16 September 2013, Shenzhen--ZTE today unveiled the world＇s first flexible, reconfigurable terabit router that allows customers to build the highest-performance broadband networks. The terabit router supports the de...16 September 2013, Shenzhen--ZTE today unveiled the world＇s first flexible, reconfigurable terabit router that allows customers to build the highest-performance broadband networks. The terabit router supports the deployment of multiple line cards with processing capabilities of 10 Gbps to 1 Tbps. It also supports the deployment of modules that can scale throughput from 200 Gbps to 18 Tbps. For easy installation in a range of environments, the router interfaces are flexible and the component design is loose-coupled. This allows customers to customize networks to their needs and promotes adaptability, consistency, and continuity.展开更多
MORE than 1,000 Ghanaians are benefiting directly by way of jobs from a $600 million Sunon Asogli Thermal Power Plant （Ghana） Limited project - a power generating plant established in the Kpone-Tema metropolis, one ...MORE than 1,000 Ghanaians are benefiting directly by way of jobs from a $600 million Sunon Asogli Thermal Power Plant （Ghana） Limited project - a power generating plant established in the Kpone-Tema metropolis, one of the highly industrialized metropolitan areas in Ghana.展开更多
In order to meet the self-powered requirement by microelectronic products and micro-electrostatic vibration generator and avoid the environmental pollution caused by waste batteries,many countries have started their r...In order to meet the self-powered requirement by microelectronic products and micro-electrostatic vibration generator and avoid the environmental pollution caused by waste batteries,many countries have started their researches on piezoelectric power generation based on the researches on the recovery device of rotational energy of piezoelectric effect.The piezoelectric power generation has many advantages compared with other generation patterns.The piezoelectric power generation has become a new field of research.In this study,the piezoelectric vibrators were used to convert energy.According to the requirements by tire pressure alarm system,the energy conversion and storage were researched and analyzed by using the passive sensing device used in automotive inspection.The converted energy was then provided to the alarm,achieving intelligent control and utilization of piezoelectric vibrators.展开更多
The wind-assisted propulsion system is becoming one of the most popular and efficient ways to reduce both fuel consumption and carbon dioxide emission from the ships.In this study,several analyses have been carried ou...The wind-assisted propulsion system is becoming one of the most popular and efficient ways to reduce both fuel consumption and carbon dioxide emission from the ships.In this study,several analyses have been carried out on a model of bulk carrier fitted with five rigid sails with a 180°rotating mechanism for maximum usage of wind power and a telescopic reefing mechanism for folding it during berthing.The stability of the ship has been verified through the calculations of initial stability,static stability,and dynamic stability through the fulfillment of the weather criterion using MAXSURF software.The structural analysis of the sail was carried out in ANSYS static structural module.Several flow simulations were carried out in ANSYS fluent module to predict the thrusts produced by the sails at different apparent wind angles,which would in turn reduce the thrust required from the propeller.In this way,the brake horse powers required for different sail arrangements were analyzed to find out a guideline for this wind propulsion system to generate better powering performances.To consider drift and yaw effect on propulsion system,an MMG mathematical model–based simulation was carried out for different drift angles of motion of the ship considering hard sail–based wind loads.Through these analyses,it has been found out that the hard sail–based wind-assisted propulsion system in some cases have produced a reduction of more than 30%brake power in straight ahead motion and around 20%reduction in case of drifting ships compared to the model having no sails.展开更多
1.Background The use of engineering tools,design,research,and thinking to create environments and capabilities whereby individuals who are currently under-employed or unemployed due to a physical disability(e.g.,amput...1.Background The use of engineering tools,design,research,and thinking to create environments and capabilities whereby individuals who are currently under-employed or unemployed due to a physical disability(e.g.,amputation or spinal cord injury)or neurological difference(e.g.,autism)are enabled to become fully productive and employed members of society has been the implicit goal of decades of research at Vanderbilt University and elsewhere.At Vanderbilt University,progress in these areas has been greatly facilitated by the proximity of the School of Engineering to the world-class Vanderbilt University Medical Center and the resulting close collaboration between engineering and medical researchers.展开更多
Data management experts met on September 21,2020 in Beijing and online at the 2020 National Big Data Standardization Conference and the 7th plenary meeting of the big data working group of National Information Securit...Data management experts met on September 21,2020 in Beijing and online at the 2020 National Big Data Standardization Conference and the 7th plenary meeting of the big data working group of National Information Security Standardization Technical Committee(SAC/TC 28),sharing and exchanging the progress and prospects in the area.展开更多
The fourth issue of iEnergy in 2023 has arrived,with 11 papers published,including 2 news and views,2 highlights,1 letter,3 review articles,and 3 original research articles.The dynamics of contemporary power systems a...The fourth issue of iEnergy in 2023 has arrived,with 11 papers published,including 2 news and views,2 highlights,1 letter,3 review articles,and 3 original research articles.The dynamics of contemporary power systems are undergoing a profound metamorphosis.The once-linear energy flow from centralized sources is giving way to a distributed and diverse energy landscape.展开更多
China helps to diversify Zambia’s energy output to tackle chronic electricity shortages Innocent Gondwe tries to put up a smile as he uses his welding machine anxiously to finish his work in time in order to get paid...China helps to diversify Zambia’s energy output to tackle chronic electricity shortages Innocent Gondwe tries to put up a smile as he uses his welding machine anxiously to finish his work in time in order to get paid,before a scheduled power cut.But he is unable to fully hide the pain in his eyes caused by the frequent power cuts that are a!ecting his business,which solely depends on electricity supply from ZESCO,Zambia’s major power utility company.After dropping out of school,Gondwe went all out to establish himself as an artisan to earn a living in Kalingalinga,one of the slums in Lusaka,Zambia’s capital.展开更多
There are abound with the deconstruction of classic works in recent years,among which Updike’s Gertrude and Claudius is undoubtedly an impressive one.Updike completed the antecedent part of Shakespeare’s play Hamlt....There are abound with the deconstruction of classic works in recent years,among which Updike’s Gertrude and Claudius is undoubtedly an impressive one.Updike completed the antecedent part of Shakespeare’s play Hamlt.Noticeably,this new prequel of Hamlet,from the mindset of female,takes Queen Gertrude as the narrative center and airs Gertrude’s psychological states to break the confinement of female discourse in Shakespeare’s plays.Hinged on Foucault’s theory of power and discourse,this paper attempts to analyze how Updike manifests women’s endeavors to assert preserve and construct their discourse,break the aphasia and even challenge the voice of male authority by elucidating the interactions between Queen Gertrude and other crucial male roles in the full text in order to navigate readers in-depth to scrutinize the changes of women’s social status in different era.展开更多
As fundamental economic units,county economies play a crucial role in China's national economic system.However,it remains unclear whether intellectual property rights policies at the county level can promote econo...As fundamental economic units,county economies play a crucial role in China's national economic system.However,it remains unclear whether intellectual property rights policies at the county level can promote economic growth.We used a quasi-natural experiment from the Intellectual Property Powering County Project("the Project")to measure their impact on county economic growth from 2009 to 2020,applying a multi-period diference-in-differences method.County economic growth indicators were measured using Enhanced Vegetation Index-calibrated nighttime light data from the Defense Meteorological Satellite Program and Visible Infrared Imaging Radiometer Suite.The findings demonstrated that the Project promoted economic growth significantly by incentivizing innovation,attracting high-tech and new-tech enterprises,and fostering brand creation.The Project also exhibited significant heterogeneity across districts and counties,along with spillover effects on economic growth in surrounding counties within approximately 80 kilometers.展开更多
The rapid evolution of wireless technologies and the growing complexity of network infrastructures necessitate a paradigm shift in how communication networks are designed,configured,and managed. Recent advancements in...The rapid evolution of wireless technologies and the growing complexity of network infrastructures necessitate a paradigm shift in how communication networks are designed,configured,and managed. Recent advancements in large language models (LLMs) have sparked interest in their potential to revolutionize wireless communication systems. However, existing studies on LLMs for wireless systems are limited to a direct application for telecom language understanding. To empower LLMs with knowledge and expertise in the wireless domain, this paper proposes WirelessLLM, a comprehensive framework for adapting and enhancing LLMs to address the unique challenges and requirements of wireless communication networks. We first identify three foundational principles that underpin WirelessLLM:knowledge alignment, knowledge fusion, and knowledge evolution. Then,we investigate the enabling technologies to build WirelessLLM, including prompt engineering, retrieval augmented generation, tool usage, multi-modal pre-training, and domain-specific fine-tuning. Moreover, we present three case studies to demonstrate the practical applicability and benefits of WirelessLLM for solving typical problems in wireless networks. Finally, we conclude this paper by highlighting key challenges and outlining potential avenues for future research.展开更多
Electrostatic generators show great potential for powering widely distributed electronic devices in Internet of Things(IoT)applications.However,a critical issue limiting such generators is their high impedance mismatc...Electrostatic generators show great potential for powering widely distributed electronic devices in Internet of Things(IoT)applications.However,a critical issue limiting such generators is their high impedance mismatch when coupled to electronics,which results in very low energy utilization efficiency.Here,we present a high-performance energy management unit(EMU)based on a spark-switch tube and a buck converter with an RF inductor.By optimizing the elements and parameters of the EMU,a maximum direct current output power of 79.2 mW m^(-2)rps^(-1)was reached for a rotary electret generator with the EMU,achieving 1.2 times greater power output than without the EMU.Furthermore,the maximum power of the contact-separated triboelectric nanogenerator with an EMU is 1.5 times that without the EMU.This excellent performance is attributed to the various optimizations,including utilizing an ultralow-loss spark-switch tube with a proper breakdown voltage,adding a matched input capacitor to enhance available charge,and incorporating an RF inductor to facilitate the high-speed energy transfer process.Based on this extremely efficient EMU,a compact self-powered wireless temperature sensor node was demonstrated to acquire and transmit data every 3.5 s under a slight wind speed of 0.5 m/s.This work greatly promotes the utilization of electrostatic nanogenerators in practical applications,particularly in IoT nodes.展开更多
The commercially available 4000-Watt continuous-wave(CW)Erbium-doped-fiber laser,emitting at the 1567-nm wavelength where the atmosphere has high transmission,provides an opportunity for harvesting electric power at r...The commercially available 4000-Watt continuous-wave(CW)Erbium-doped-fiber laser,emitting at the 1567-nm wavelength where the atmosphere has high transmission,provides an opportunity for harvesting electric power at remote“off the grid”locations using a multi-module photovoltaic(PV)“receiver”panel.This paper proposes a 32-element monocrystalline thick-layer Germanium PV panel for efficient harvesting of a collimated 1.13-m-diam beam.The 0.78-m^(2) PV panel is constructed from commercial Ge wafers.For incident CW laser-beam power in the 4000 to 10,000 W range,our thermal,electrical,and infrared simulations predict 660 to 1510 Watts of electrical output at the panel temperatures of 350 to 423 K.展开更多
Female NPC deputies from ethnic minority groups stand out.China's most significant annual political event,known as the Two Sessions,commenced in Beijing on March 4,bringing together thousands of deputies to the 14...Female NPC deputies from ethnic minority groups stand out.China's most significant annual political event,known as the Two Sessions,commenced in Beijing on March 4,bringing together thousands of deputies to the 14th National People's Congress(NPC),the country's top legislature,and members of the 14th Chinese People's Political Consultative Conference(CPPCC)National Committee.展开更多
The global healthcare landscape is increasingly challenged by the rising prevalence of chronic diseases and the demographic shift towards an aging population,necessitating the development of innovative and sustainable...The global healthcare landscape is increasingly challenged by the rising prevalence of chronic diseases and the demographic shift towards an aging population,necessitating the development of innovative and sustainable healthcare solutions.In this context,the emergence of triboelectric energy harvesters as a key technological breakthrough offers a viable pathway towards self-powered,efficient,and sustainable personal health management.This review critically examines the transformative potential of triboelectric nanogenerators(TENGs)in addressing the pressing challenges of modern healthcare,underscoring their unique benefits such as being battery-free,easy to fabricate,and cost-efficient.We begin by reviewing the fundamental mechanisms of triboelectrification at the atomic scale and presenting the contact electrification among various materials,such as metals,polymers,and semiconductors.The discussion subsequently extends to the commonly used materials for TENGs and explores advancements in their design and functionality,with an emphasis on structural and chemical innovations.Furthermore,the application spectrum of TENGs in personal health management is extensively reviewed,covering aspects including health monitoring,therapeutic intervention,health protection,and device powering,while highlighting their capacity for self-sustainability.The review concludes by addressing existing challenges while mapping out the latest significant contributions and prospective directions in TENG-based healthcare innovations.By facilitating a paradigm shift towards a more autonomous,cost-effective,and personalized healthcare model,independent of external power sources,TENGs are poised to markedly enhance the quality of care and overall well-being,marking the dawn of a new era in integrated personal health management.展开更多
文摘China’s Dongfang Electric Machinery successfully completed the manufacturing of the first batch of embedded components for six turbines it is supplying for the Koysha Hydroelectric Dam project in Ethiopia.Transported by land and sea,these parts will arrive on site in three months.Once completed,the power plant will generate more than 6 billion kwh of electricity annually,reducing carbon dioxide emissions by 1 million tonnes per year.
文摘The rapid evolution and expanding scale of AI(artificial intelligence)technologies exert unprecedented energy demands on global electrical grids.Powering computationally intensive tasks such as large-scale AI model training and widespread real-time inference necessitates substantial electricity consumption,presenting a significant challenge to conventional power infrastructure.This paper examines the critical need for a fundamental shift towards smart energy grids in response to AI’s growing energy footprint.It delves into the symbiotic relationship wherein AI acts as a significant energy consumer while offering the intelligence required for dynamic load management,efficient integration of renewable energy sources,and optimized grid operations.We posit that advanced smart grids are indispensable for facilitating AI’s sustainable growth,underscoring this synergy as a pivotal advancement toward a resilient energy future.
文摘On 26 July,a parallel session of the Seventh China-Africa People's Forum&the Seventh China-Africa Young Leaders Forum-Forum on Youth Development,Innovation and Entrepreneurship was held in Yiyang.
文摘Uganda launches giant China-constructed hydropower plant to bolster its electricity supply,and also assist South Sudan with theirs Ugandans and South Sudanese have had their lives lit up by the steady flow of electricity from a massive hydropower infrastructure project,constructed by one of China’s leading contractors.
文摘16 September 2013, Shenzhen--ZTE today unveiled the world＇s first flexible, reconfigurable terabit router that allows customers to build the highest-performance broadband networks. The terabit router supports the deployment of multiple line cards with processing capabilities of 10 Gbps to 1 Tbps. It also supports the deployment of modules that can scale throughput from 200 Gbps to 18 Tbps. For easy installation in a range of environments, the router interfaces are flexible and the component design is loose-coupled. This allows customers to customize networks to their needs and promotes adaptability, consistency, and continuity.
文摘MORE than 1,000 Ghanaians are benefiting directly by way of jobs from a $600 million Sunon Asogli Thermal Power Plant （Ghana） Limited project - a power generating plant established in the Kpone-Tema metropolis, one of the highly industrialized metropolitan areas in Ghana.
基金Supported by Natural Science Foundation of Hebei Province(E2013204069)Scienceand Technology Research and Development Program of Baoding City(13ZG020+4 种基金13ZF005)Science and Engineering Fund of Agricultural University of Hebei(LG20120204LG201401)College Students’Innovation and Entrepreneurship Fund of Agricultural University of Hebei(201310086011cxzr2014031)~~
文摘In order to meet the self-powered requirement by microelectronic products and micro-electrostatic vibration generator and avoid the environmental pollution caused by waste batteries,many countries have started their researches on piezoelectric power generation based on the researches on the recovery device of rotational energy of piezoelectric effect.The piezoelectric power generation has many advantages compared with other generation patterns.The piezoelectric power generation has become a new field of research.In this study,the piezoelectric vibrators were used to convert energy.According to the requirements by tire pressure alarm system,the energy conversion and storage were researched and analyzed by using the passive sensing device used in automotive inspection.The converted energy was then provided to the alarm,achieving intelligent control and utilization of piezoelectric vibrators.
文摘The wind-assisted propulsion system is becoming one of the most popular and efficient ways to reduce both fuel consumption and carbon dioxide emission from the ships.In this study,several analyses have been carried out on a model of bulk carrier fitted with five rigid sails with a 180°rotating mechanism for maximum usage of wind power and a telescopic reefing mechanism for folding it during berthing.The stability of the ship has been verified through the calculations of initial stability,static stability,and dynamic stability through the fulfillment of the weather criterion using MAXSURF software.The structural analysis of the sail was carried out in ANSYS static structural module.Several flow simulations were carried out in ANSYS fluent module to predict the thrusts produced by the sails at different apparent wind angles,which would in turn reduce the thrust required from the propeller.In this way,the brake horse powers required for different sail arrangements were analyzed to find out a guideline for this wind propulsion system to generate better powering performances.To consider drift and yaw effect on propulsion system,an MMG mathematical model–based simulation was carried out for different drift angles of motion of the ship considering hard sail–based wind loads.Through these analyses,it has been found out that the hard sail–based wind-assisted propulsion system in some cases have produced a reduction of more than 30%brake power in straight ahead motion and around 20%reduction in case of drifting ships compared to the model having no sails.
基金support has been provided by US National Science Foundation(OIA-1936970)a Howard Hughes Medical Institute professorship award.
文摘1.Background The use of engineering tools,design,research,and thinking to create environments and capabilities whereby individuals who are currently under-employed or unemployed due to a physical disability(e.g.,amputation or spinal cord injury)or neurological difference(e.g.,autism)are enabled to become fully productive and employed members of society has been the implicit goal of decades of research at Vanderbilt University and elsewhere.At Vanderbilt University,progress in these areas has been greatly facilitated by the proximity of the School of Engineering to the world-class Vanderbilt University Medical Center and the resulting close collaboration between engineering and medical researchers.
文摘Data management experts met on September 21,2020 in Beijing and online at the 2020 National Big Data Standardization Conference and the 7th plenary meeting of the big data working group of National Information Security Standardization Technical Committee(SAC/TC 28),sharing and exchanging the progress and prospects in the area.
文摘The fourth issue of iEnergy in 2023 has arrived,with 11 papers published,including 2 news and views,2 highlights,1 letter,3 review articles,and 3 original research articles.The dynamics of contemporary power systems are undergoing a profound metamorphosis.The once-linear energy flow from centralized sources is giving way to a distributed and diverse energy landscape.
文摘China helps to diversify Zambia’s energy output to tackle chronic electricity shortages Innocent Gondwe tries to put up a smile as he uses his welding machine anxiously to finish his work in time in order to get paid,before a scheduled power cut.But he is unable to fully hide the pain in his eyes caused by the frequent power cuts that are a!ecting his business,which solely depends on electricity supply from ZESCO,Zambia’s major power utility company.After dropping out of school,Gondwe went all out to establish himself as an artisan to earn a living in Kalingalinga,one of the slums in Lusaka,Zambia’s capital.
文摘There are abound with the deconstruction of classic works in recent years,among which Updike’s Gertrude and Claudius is undoubtedly an impressive one.Updike completed the antecedent part of Shakespeare’s play Hamlt.Noticeably,this new prequel of Hamlet,from the mindset of female,takes Queen Gertrude as the narrative center and airs Gertrude’s psychological states to break the confinement of female discourse in Shakespeare’s plays.Hinged on Foucault’s theory of power and discourse,this paper attempts to analyze how Updike manifests women’s endeavors to assert preserve and construct their discourse,break the aphasia and even challenge the voice of male authority by elucidating the interactions between Queen Gertrude and other crucial male roles in the full text in order to navigate readers in-depth to scrutinize the changes of women’s social status in different era.
基金support from the China National Social Science Foundation (No.23BJY216)the Major Project of the key research institutes of Chinese Ministry of Education (No.22JJD790051)+1 种基金the Key Project of Social Science Foundation of Fujian Province (No.FJ2022A011)the Fundamental Research Funds for the Central Universities (No.20720191070).
文摘As fundamental economic units,county economies play a crucial role in China's national economic system.However,it remains unclear whether intellectual property rights policies at the county level can promote economic growth.We used a quasi-natural experiment from the Intellectual Property Powering County Project("the Project")to measure their impact on county economic growth from 2009 to 2020,applying a multi-period diference-in-differences method.County economic growth indicators were measured using Enhanced Vegetation Index-calibrated nighttime light data from the Defense Meteorological Satellite Program and Visible Infrared Imaging Radiometer Suite.The findings demonstrated that the Project promoted economic growth significantly by incentivizing innovation,attracting high-tech and new-tech enterprises,and fostering brand creation.The Project also exhibited significant heterogeneity across districts and counties,along with spillover effects on economic growth in surrounding counties within approximately 80 kilometers.
基金supported by Hong Kong Research Grants Council under the Areas of Excellence Scheme Grant AoE/E-601/22-RNSFC/RGC Collaborative Research Scheme Grant CRS HKUST603/22.
文摘The rapid evolution of wireless technologies and the growing complexity of network infrastructures necessitate a paradigm shift in how communication networks are designed,configured,and managed. Recent advancements in large language models (LLMs) have sparked interest in their potential to revolutionize wireless communication systems. However, existing studies on LLMs for wireless systems are limited to a direct application for telecom language understanding. To empower LLMs with knowledge and expertise in the wireless domain, this paper proposes WirelessLLM, a comprehensive framework for adapting and enhancing LLMs to address the unique challenges and requirements of wireless communication networks. We first identify three foundational principles that underpin WirelessLLM:knowledge alignment, knowledge fusion, and knowledge evolution. Then,we investigate the enabling technologies to build WirelessLLM, including prompt engineering, retrieval augmented generation, tool usage, multi-modal pre-training, and domain-specific fine-tuning. Moreover, we present three case studies to demonstrate the practical applicability and benefits of WirelessLLM for solving typical problems in wireless networks. Finally, we conclude this paper by highlighting key challenges and outlining potential avenues for future research.
基金supported by the NSFC(No.52275563),China Postdoctoral Science Foundation(BX20220162)Shuimu Tsinghua Scholar Program,and a grant from the Guoqiang Institute,Tsinghua University.
文摘Electrostatic generators show great potential for powering widely distributed electronic devices in Internet of Things(IoT)applications.However,a critical issue limiting such generators is their high impedance mismatch when coupled to electronics,which results in very low energy utilization efficiency.Here,we present a high-performance energy management unit(EMU)based on a spark-switch tube and a buck converter with an RF inductor.By optimizing the elements and parameters of the EMU,a maximum direct current output power of 79.2 mW m^(-2)rps^(-1)was reached for a rotary electret generator with the EMU,achieving 1.2 times greater power output than without the EMU.Furthermore,the maximum power of the contact-separated triboelectric nanogenerator with an EMU is 1.5 times that without the EMU.This excellent performance is attributed to the various optimizations,including utilizing an ultralow-loss spark-switch tube with a proper breakdown voltage,adding a matched input capacitor to enhance available charge,and incorporating an RF inductor to facilitate the high-speed energy transfer process.Based on this extremely efficient EMU,a compact self-powered wireless temperature sensor node was demonstrated to acquire and transmit data every 3.5 s under a slight wind speed of 0.5 m/s.This work greatly promotes the utilization of electrostatic nanogenerators in practical applications,particularly in IoT nodes.
基金the support of the US Air Force Office of Scientific Research on Grant No.FA9550-21-1-0347.Osupport from NSERC Canada(Discovery,SPG,and CRD Grants),Canada Research Chairs,Canada Foundation for Innovation,Mitacs,PRIMA Qu ebec,Defence Canada(Innovation for Defence Excellence and Security,IDEaS)+2 种基金the European Union’s Horizon Europe research and innovation program under grant agreement No 101070700(MIRAQLS)the U.S.Army Research Office on Grant No.W911NF-22-1-0277the U.S.Air Force Office of Scientific Research on Grant No.FA9550-23-1-0763.
文摘The commercially available 4000-Watt continuous-wave(CW)Erbium-doped-fiber laser,emitting at the 1567-nm wavelength where the atmosphere has high transmission,provides an opportunity for harvesting electric power at remote“off the grid”locations using a multi-module photovoltaic(PV)“receiver”panel.This paper proposes a 32-element monocrystalline thick-layer Germanium PV panel for efficient harvesting of a collimated 1.13-m-diam beam.The 0.78-m^(2) PV panel is constructed from commercial Ge wafers.For incident CW laser-beam power in the 4000 to 10,000 W range,our thermal,electrical,and infrared simulations predict 660 to 1510 Watts of electrical output at the panel temperatures of 350 to 423 K.
文摘Female NPC deputies from ethnic minority groups stand out.China's most significant annual political event,known as the Two Sessions,commenced in Beijing on March 4,bringing together thousands of deputies to the 14th National People's Congress(NPC),the country's top legislature,and members of the 14th Chinese People's Political Consultative Conference(CPPCC)National Committee.
基金supported by the National Research Foundation of Korea(NRF)Grant funded by the Korea government(MSIT)(Nos.2020R1A5A1019131 and 2022M3D1A2054488)。
文摘The global healthcare landscape is increasingly challenged by the rising prevalence of chronic diseases and the demographic shift towards an aging population,necessitating the development of innovative and sustainable healthcare solutions.In this context,the emergence of triboelectric energy harvesters as a key technological breakthrough offers a viable pathway towards self-powered,efficient,and sustainable personal health management.This review critically examines the transformative potential of triboelectric nanogenerators(TENGs)in addressing the pressing challenges of modern healthcare,underscoring their unique benefits such as being battery-free,easy to fabricate,and cost-efficient.We begin by reviewing the fundamental mechanisms of triboelectrification at the atomic scale and presenting the contact electrification among various materials,such as metals,polymers,and semiconductors.The discussion subsequently extends to the commonly used materials for TENGs and explores advancements in their design and functionality,with an emphasis on structural and chemical innovations.Furthermore,the application spectrum of TENGs in personal health management is extensively reviewed,covering aspects including health monitoring,therapeutic intervention,health protection,and device powering,while highlighting their capacity for self-sustainability.The review concludes by addressing existing challenges while mapping out the latest significant contributions and prospective directions in TENG-based healthcare innovations.By facilitating a paradigm shift towards a more autonomous,cost-effective,and personalized healthcare model,independent of external power sources,TENGs are poised to markedly enhance the quality of care and overall well-being,marking the dawn of a new era in integrated personal health management.
