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From COVID-19 to Nipah virus preparedness in low-and middle-income countries:Re-centering points of decision and responsible AI 认领 引用 被引量：1
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作者 Giao Huynh Han Thi Ngoc Nguyen +3 位作者 Ly Trieu Vo Emily Evans Nhut Minh Vuong Pham Le An 《Asian Pacific Journal of Tropical Medicine》 SCIE CAS 2026年第4期145-147,共3页
Nipah virus(NiV)is a zoonotic pathogen that causes severe neurological and respiratory diseases characterized by high mortality rates[1].The emergence of sporadic cases in Bangladesh in 2025 and subsequent infections ... Nipah virus(NiV)is a zoonotic pathogen that causes severe neurological and respiratory diseases characterized by high mortality rates[1].The emergence of sporadic cases in Bangladesh in 2025 and subsequent infections among healthcare workers in West Bengal in early 2026 highlight a significant epidemic potential[2].This risk is further exacerbated by the absence of licensed vaccines or targeted antiviral therapies[1,3,4].Consequently,there is an urgent need for strengthened surveillance and operational preparedness in low-and middle-income countries(LMICs),which often face resource-limited healthcare systems and overcrowded settings with inadequate infection prevention and control(IPC)measures[1,5]. 展开更多
关键词 targeted antiviral therapies consequentlythere zoonotic pathogen severe neurological respiratory diseases preparedness nipah virus covid nipah virus niv low middle income countries
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Preservation Effect of Ginger Essential Oil Solution on Pre-prepared Lentinus edodes Dishes 认领 引用
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作者 Kun TANG Huifang MOU +2 位作者 Qing LI Sisheng SUN Chunyan XIE 《Asian Agricultural Research》 2026年第8期33-39,共7页
[Objectives]To introduce a ginger essential oil solution possessing a dual"antibacterial-antioxidant"protective effect,and investigate its preservation effect on fresh-cut pre-prepared Lentinus edodes.[Metho... [Objectives]To introduce a ginger essential oil solution possessing a dual"antibacterial-antioxidant"protective effect,and investigate its preservation effect on fresh-cut pre-prepared Lentinus edodes.[Methods]Single-factor experiments combined with response surface methodology were conducted to screen the optimal concentration of ginger essential oil,using sensory score,total phenol content,and polyphenol oxidase(PPO)activity as evaluation indicators.A verification test was carried out to compare the preservation effects of the optimal concentration treatment group and the control group under the storage condition at 25℃.[Results]Response surface analysis determined that the optimal concentration of ginger essential oil was 0.3%.The verification test showed that under the storage condition at 25℃,the 0.3%ginger essential oil treatment group extended the shelf life by 4 d compared with the control group.Compared with the control group,the treatment group exhibited a 23.4%increase in total phenol content and a 59.0%reduction in PPO activity,and its sensory quality was significantly superior.[Conclusions]The 0.3%ginger essential oil solution effectively maintained the sensory quality of fresh-cut L.edodes,increased the content of endogenous antioxidants,and inhibited the activity of browning-related enzymes,thereby extending the shelf life by 4 d.This study provides a new method for the green preservation of edible fungi. 展开更多
关键词 Ginger essential oil Fresh-cut Lentinus edodes Preservation studies Antioxidant Prepared dishes
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The Digital-Intelligent Empowerment and Transnational Marketing in the Prepared Dishes Industry:A Case Study of Quick-Frozen Dumplings 认领 引用
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作者 Hengrui Zhang Mingyu Zhang 《Proceedings of Business and Economic Studies》 2026年第6期277-282,共6页
Taking into account the digital economy and the search for new quality productive forces,digital intelligent empowerment has become one of the most important driving forces in the prepared dishes sector in China to co... Taking into account the digital economy and the search for new quality productive forces,digital intelligent empowerment has become one of the most important driving forces in the prepared dishes sector in China to counteract the issue of cross-border marketing and enhance its competitive status in the international market.Quick-frozen dumplings are offered as the best export item because they are an indicator of all the export results of the industrial sector in the state due to the developed production process and the existence of a specific market segment.Case study and literature review,industry induction and case analysis of the approach to participation of prepared dishes industry in cross-border marketing by means of digital-intelligent empowerment form the basis of the current paper.It also encompasses four major weaknesses,including bad performance of digital marketing,absence of localization,failure to create a brand,and inability to reach professionals owing to the low degree of digitalization,fragmentation of information,lack of proper training,and poor relationship with the industry.The proposed five-dimensional solutions,i.e.,adoption of deep tech,talent development,localization,building of a brand,and industry coordination,are rather realistic.The results offer valuable recommendations to the industry in order to operate in the world markets,develop new quality productive forces,and contribute to high-quality international development. 展开更多
关键词 Digital-intelligent empowerment Prepared dishes Cross-border marketing Differentiated development Quick-frozen dumpling
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Evaluating Changes in Disaster Preparedness Awareness among Nursing Students in Japan: Insights after Three Years of Nursing Education 认领 引用
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作者 Yuriko Inoue Mikako Tanaka +6 位作者 Hiromitsu Ezure Junji Ito Akiko Sasaki Takashi Takaki Harumi Hata Masaaki Takayanagi Naruhito Otsuka 《Open Journal of Nursing》 2025年第1期53-59,共7页
Background: Disaster preparedness is a critical aspect of nursing education, enhancing students’ ability to respond effectively in emergencies. However, the extent to which nursing curricula influence disaster prepar... Background: Disaster preparedness is a critical aspect of nursing education, enhancing students’ ability to respond effectively in emergencies. However, the extent to which nursing curricula influence disaster preparedness awareness remains underexplored. Our study found that 39% of students reported improved awareness after three years, highlighting the need for targeted curriculum enhancements. Purpose: To evaluate changes in disaster preparedness awareness among nursing students over three years of education and identify gaps in current curricula impacting this awareness. Results: Findings indicate that while 39% of students showed improved awareness, significant gaps remain, suggesting the need for a dedicated course on emergency preparedness. Conclusions: This study emphasizes the importance of integrating comprehensive disaster preparedness education within nursing curricula to address these gaps and foster resilience in future healthcare professionals. 展开更多
关键词 Disaster Preparedness Consciousness Nursing Students
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Who prepares?Seismic risk,household income,and individual earthquake preparedness in California 认领 引用
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作者 Reyna LReyes-Nunez Thomas Jamieson 《Emergency Management Science and Technology》 2023年第1期100-108,共9页
How does seismic risk influence individual disaster preparedness?Previous research demonstrates that differences in individual preparedness in at-risk communities can be attributed to a variety of individual-level cha... How does seismic risk influence individual disaster preparedness?Previous research demonstrates that differences in individual preparedness in at-risk communities can be attributed to a variety of individual-level characteristics such as disaster experience,risk perception and risk preferences,cognitive heuristics and biases,perception of hazards,and their ability to interpret information and understand probabilistic forecasts.However,less is known about how localized seismic risk affects individuals'preparedness for earthquakes.In this paper,we combine localized data about seismic risk with novel survey data from a sample of 680 Californian residents to test how individuals'seismic risks influence their individual preparedness for earthquakes.Our results demonstrate that seismic risk is positively associated with individual preparedness,while controlling for alternative explanations.On the other hand,household income is not a good predictor of individual earthquake preparedness.Our results demonstrate that individuals are generally responsive to the risks in their environment,while also providing several avenues for information campaigns to implement lessons from this study to further encourage preparedness. 展开更多
关键词 household income individual preparedness information campaigns disaster preparednessprevious California disaster preparedness seismic risk risk perception
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On the Centenary of the Spanish Flu: Being Prepared for the Next Pandemic 认领 引用 被引量：10
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作者 William J.Liu Yuhai Bi +1 位作者 Dayan Wang George F.Gao 《Virologica Sinica》 SCIE CAS CSCD 2018年第6期463-466,共4页
Influenza is one of the oldest infectious diseases affecting humans. Every influenza pandemic in history has ended with disastrous outcomes regarding public health and the social economy. This year marks the 100th ann... Influenza is one of the oldest infectious diseases affecting humans. Every influenza pandemic in history has ended with disastrous outcomes regarding public health and the social economy. This year marks the 100th anniversary of the Spanish flu (H1N1) outbreak of 1918, which is recognized as the most lethal natural event in recent history. 展开更多
关键词 Being Prepared for the Next Pandemic On the Centenary of the Spanish Flu
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Mixture prepared with Chinese medicines in terms of releasing exterior cold and clearing interior heat: its efficacy and safety in patients with seasonal influenza-a randomized controlled trial 认领 引用 被引量：4
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作者 Wu Zhisong Li Guodong +7 位作者 Wei Wan Liu Zhaoheng Wang Wei Ma Ruihong Liu Wenhong Ma Jiaju Wang Yuguang Jiao Yang 《Journal of Traditional Chinese Medicine》 SCIE CSCD 2018年第5期746-753,共8页
OBJECTIVE: To assess the efficacy and safety in 105 patients with seasonal Influenza in Beijing, the mixture prepared with Chinese medicines follows the treatment regimen of releasing exterior cold andclearing interio... OBJECTIVE: To assess the efficacy and safety in 105 patients with seasonal Influenza in Beijing, the mixture prepared with Chinese medicines follows the treatment regimen of releasing exterior cold andclearing interior heat.METHODS: Total 330 patients with seasonal influenza were enrolled and randomly and averagely divided into the Chinese herbal medicine, the western medicine and the Chinese patent medicine group. They were treated with Chinese medicine Oseltamivir Phosphate Capsules and the Scattering Wind and Resolving Toxins Capsules. The main efficacy indicators were the antifebrile onset time and recovery time of body temperature. The efficacy and safety of the mixture was scientifically evaluated. Comparisons of several variables were analyzed.RESULTS: Median antifebrile onset time of the Chinese herbal medicine group was significantly shorter than the western medicine group(P < 0.05) and the Chinese patent medicine group(P < 0.05). The median antifebrile recovery time of the Chinese herbal medicine group was significantly shorter than the Chinese patent medicine group(P <0.05). The groups evaluated by TCM symptom pattern effect, both the Chinese herbal medicine group and Western Medicine group were better than the Chinese patent medicine group(P <0.05). The disappearance rate of main symptoms and some minor symptom patterns of the Chinese herbal medicine group were higher than the other 2 groups.CONCLUSION: The mixture of releasing exterior cold and clearing interior heat could significantly shorten the fever time with safety. 展开更多
关键词 Releasing exterior cold and clearing interior heat Influenza efficacy Mixture prepared with Chinese medicines
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The role of hazard vulnerability assessments in disaster preparedness and prevention in China 认领 引用 被引量：4
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作者 Yan Du Yi-bo Ding +1 位作者 Zi-xiong Li Guang-wen Cao 《Military Medical Research》 CAS 2015年第4期228-234,共7页
China is prone to disasters and escalating disaster losses. Effective disaster mitigation is the foundation for efficient disaster response and rescue and for reducing the degree of hazardous impacts on the population... China is prone to disasters and escalating disaster losses. Effective disaster mitigation is the foundation for efficient disaster response and rescue and for reducing the degree of hazardous impacts on the population. Vulnerability refers to the population's capacity to anticipate, cope with, and recover from the impact of a hazardous event. A hazard vulnerability assessment(HVA) systematically evaluates the damage that could be caused by a potential disaster, the severity of the impact, and the available medical resources during a disaster to reduce population vulnerability and increase the capacity to cope with disasters. In this article, we summarized HVA team membership, content(disaster identification, probability and consequences), and methods and procedures for an HVA that can be tailored to China's needs. We further discussed the role of epidemiology in an HVA. Disaster epidemiology studies the underlying causes of disasters to achieve effective disaster prevention and reduction. In addition, we made several recommendations that are already in practice in developed countries, such as the U.S., for future implementation in China and other developing countries. An effective HVA plan is crucial for successful disaster preparedness, response, and recovery. 展开更多
关键词 Vulnerability Hazard vulnerability assessment Disaster epidemiology Disaster preparedness
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Magnetostriction Increase of Tb0.3Dy0.7Fe1.95 Alloy Prepared by Solidification in High Magnetic Fields 认领 引用 被引量：3
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作者 王凯 刘铁 +3 位作者 高鹏飞 王强 刘印 赫冀成 《Chinese Physics Letters》 SCIE EI CAS CSCD 2015年第3期137-140,共4页
Tb0.3Dy0.TFe1.95 alloys are solidified under various high magnetic field conditions. The influence of a high magnetic field on the crystal orientation, morphology and magnetostriction of the alloys are studied. The re... Tb0.3Dy0.TFe1.95 alloys are solidified under various high magnetic field conditions. The influence of a high magnetic field on the crystal orientation, morphology and magnetostriction of the alloys are studied. The results show that with the increase of magnetic flux density, the crystal orientation of the （Tb,Dy）Fe2 phase changed from （113） to （111） direction; the grains in the alloys tended to align along the magnetic field direction; and the magnetostriction of Tb0.3Dy0.7Fe1.95 alloys is remarkably improved. The change in magnetostriction of Tb0.3Dy0.TFe1.95 alloys is linked to the amount and the crystal orientation behavior of the （Tb,Dy）Fe2 phase. 展开更多
关键词 Dy Alloy Prepared by Solidification in High Magnetic Fields Magnetostriction Increase of Tb Fe
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Coronavirus disease 2019 (COVID-19) pandemic: how countries shouldbuild more resilient health systems for preparedness and response 认领 引用 被引量：7
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作者 Zhebin Wang Yuqi Duan +1 位作者 Yinzi Jin Zhi-Jie Zheng 《Global Health Journal》 2020年第4期139-145,共7页
Objective: A resilient health system plays a crucial role in pandemic preparedness and response. Althoughthe World Health Organization (WHO) has required all states parties to strengthen core capacities to respondto p... Objective: A resilient health system plays a crucial role in pandemic preparedness and response. Althoughthe World Health Organization (WHO) has required all states parties to strengthen core capacities to respondto public health emergencies under the International Health Regulations (2005), the actions of most countriesto combating coronavirus disease 2019 (COVID-19) has showed that they are not well-prepared. This crosssectionalstudy aimed to examine the health system resilience of selected countries and analyze their strategiesand measures in response to the COVID-19 pandemic.Methods: This study selected five countries including the Iran, Japan, Republic of Korea (South Korea), the U.K.,and the U.S., based on the severity of the national epidemic, the geographical location, and the developmentlevel. Cumulative number of death cases derived from WHO COVID-19 dashboard was used to measure theseverity of the impact of the pandemic in each country;WHO State Parties Self-Assessment Annual Reporting (SPAR)Scores and Global Health Security (GHS) Index were applied to measure the national health system resilience;and research articles and press materials were summarized to identify the strategies and measures adopted bycountries during response to COVID-19. This study applied the resilient health systems framework to analyzehealth system resilience in the selected countries from five dimensions, including awareness, diversity, selfregulation,integration and adaptation.Results: The SPAR Scores and GHS Index of the four developed countries, Japan, South Korea, the U.K. and theU.S. were above the global and regional averages;the SPAR Scores of Iran were above the global average whilethe GHI Index lain below the global average. In terms of response strategies, Japan, the U.K. and the U.S. investedmore health resources in the treatment of severe patients, while South Korea and Iran had adopted a strategyof extensive testing and identification of suspected patients. In terms of specific measures, all the five countriesadopted measures such as restrictions on entry and international travel, closure of schools and industries,lockdown and quarantine. Nevertheless, the effectiveness of implementing these measures varied acrosscountries, based on the response strategies.Conclusion: Although SPAR Scores and GHS Index have evaluated the national core capacities for preparednessand response, the actions to cope with the COVID-19 pandemic has revealed the fact that most countries stilldo not build resilient health systems in response to public health emergencies. Health system strengtheningand health security efforts should be pursued in tandem, as part of the same mutually reinforcing approach todeveloping resilient health systems. 展开更多
关键词 Coronavirus disease 2019 COVID-19 Pandemic Resilient health systems Preparedness and response Global health security Health system strengthening
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Microstructure and Mechanical Property of 2024 Aluminium Alloy Prepared by Rapid Solidification and Mechanical Milling 认领 引用 被引量：2
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作者 Guoxian LIANG Erde WANG Zhimin LI and Zhichao LI 《Journal of Materials Science & Technology》 SCIE EI CAS 1995年第6期398-402,共5页
Rapidly solidified 2024 aluminium alloy powders were mechanically milled, then consolidated to bulk form. The microstructural changes of the powders in mechanical milling (MM) and consolidation process were characteri... Rapidly solidified 2024 aluminium alloy powders were mechanically milled, then consolidated to bulk form. The microstructural changes of the powders in mechanical milling (MM) and consolidation process were characterized by X-ray diffraction analyses and transmission electron microscopy observations. The results showed that mechanical milling reduced the grain size to nanometer, dissolved the Al2Cu intermetallic compound into the aluminium matrix and produced an aluminium supersaturated solid solution. During consolidation process. the grain size increased to submicrometer, and the Al2Cu and Al2(Cu, Mg, Si, Fe, Mn) compounds precipitated owing to heating. Increasing consolidation temperature and time results in obvious grain growth and coarsening of second phase particles. The tensile yield strength of the consolidated alloy with submicrometer size grains increases with decreasing grain size, and it follows the famous HallPetch relation 展开更多
关键词 Figure Microstructure and Mechanical Property of 2024 Aluminium Alloy Prepared by Rapid Solidification and Mechanical Milling MPR Si
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Effect of Chromium on Structure and Tribological Properties of Hydrogenated Cr/a-C:H Films Prepared via a Reactive Magnetron Sputtering System 认领 引用 被引量：1
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作者 刘龙 周升国 +2 位作者 刘正兵 王跃臣 马利秋 《Chinese Physics Letters》 SCIE EI CAS CSCD 2016年第2期92-96,共5页
Hydrogenated Cr-incorporated carbon films （Cr/a-C：H） are deposited successfully by using a dc reactive mag- netron sputtering system. The structure and mechanical properties of the as-deposited Cr/a-C：H films are ... Hydrogenated Cr-incorporated carbon films （Cr/a-C：H） are deposited successfully by using a dc reactive mag- netron sputtering system. The structure and mechanical properties of the as-deposited Cr/a-C：H films are characterized systematically by field-emission scanning electron microscope, x-ray diffraction, Raman spectra, nanoindentation and scratch. It is shown that optimal Cr metal forms nanocrystalline carbide to improve the hardness, toughness and adhesion strength in the amorphous carbon matrix, which possesses relatively higher nano-hardness of 15. 7 CPa, elastic modulus of 126.8 GPa and best adhesion strength with critical load （Lc） of 36 N for the Cr/a-C：H film deposited at CH4 flow rate of 20sccm. The friction and wear behaviors of as-deposited Cr/a-C：H films are evaluated under both the ambient air and deionized water conditions. The results reveal that it can achieve superior low friction and anti-wear performance for the Cr/a-C：H film deposited at CH4 flow rate of 20sccm under the ambient air condition, and the friction coetllcient and wear rate tested in deionized water condition are relatively lower compared with those tested under the ambient air condition for each film. Superior combination of mechanical and tribological properties for the Cr/a-C：H film should be a good candidate for engineering applications. 展开更多
关键词 of Cr Effect of Chromium on Structure and Tribological Properties of Hydrogenated Cr/a-C:H Films Prepared via a Reactive Magnetron Sputtering System in on
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Characterization and catalytic behavior of Na-W-Mn-Zr-S-P/SiO2prepared by different methods in oxidative coupling of methane 认领 引用 被引量：2
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作者 Wen Zheng Dangguo Cheng +1 位作者 Fengqiu Chen Xiaoli Zhan 《Journal of Natural Gas Chemistry》 2010年第5期515-521,共7页
Na-W-Mn-Zr-S-P/SiO2 catalysts for oxidative coupling of methane(OCM)were prepared by incipient wetness impregnation,sol-gel and mixture slurry methods.The catalyst prepared by mixture slurry method showed the best cat... Na-W-Mn-Zr-S-P/SiO2 catalysts for oxidative coupling of methane(OCM)were prepared by incipient wetness impregnation,sol-gel and mixture slurry methods.The catalyst prepared by mixture slurry method showed the best catalytic performance among all samples.In addition,the effects of different addition sequences of Na,W,Mn,Zr,S and P on the catalytic performance were studied.The absence of Na before the addition of Mn and Zr in the catalysts preparation depressed the formation of the active phases of Mn2O3 and ZrO2 and decreased the activities of the catalysts significantly. 展开更多
关键词 oxidative coupling of methane Na-W-Mn-Zr-S-P/SiO2 prepared method
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Ferromagnetism in High-Surface-Area ZnO Nanosheets Prepared by a Template-Assisted Hydrothermal Method 认领 引用 被引量：1
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作者 Hui-Fang Yang Ling-Zhi Tang +3 位作者 Qiang Sun Lei Sun Zhen-Hua Li Shu-Xia Ren 《Chinese Physics Letters》 SCIE EI CAS CSCD 2018年第6期90-93,共4页
High-surface-area ZnO nanosheets are prepared using a template-assisted hydrothermal method.A saturation moment as high as 0.02 emu/g is obtained for the ZnO nanosheets.Both photoluminescence spectroscopy and x-ray ph... High-surface-area ZnO nanosheets are prepared using a template-assisted hydrothermal method.A saturation moment as high as 0.02 emu/g is obtained for the ZnO nanosheets.Both photoluminescence spectroscopy and x-ray photoelectron spectroscopy demonstrate the existence of abundant oxygen vacancies on the surfaces of the nanosheets.In addition,the oxygen vacancy concentration increases with an increasing nanosheet surface area.The results show that the origin of the room-temperature ferromagnetism is closely related with a large surface area and oxygen vacancies of the nanosheets.This finding suggests that the high-surface-area ZnO nanosheets are promising to be applied to spintronic devices. 展开更多
关键词 ZnO Ferromagnetism in High-Surface-Area ZnO Nanosheets Prepared by a Template-Assisted Hydrothermal Method
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Electrocatalytic Activity of Ni/C Electrodes Prepared by Metal Vapor Synthesis For Hydrogen Evolution in Alkaline Solution 认领 引用 被引量：1
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作者 Shi Hua WU Chang Ying ZHU and Wei Ping HUANG 《Chinese Chemical Letters》 SCIE CAS 1997年第5期435-436,共2页
The metal vapor synthesis (MVS) methed was used to prepare activatedcarbon supported nickel electrode. The electrocatalytic activity of the electrode forhydrogen evolution reaction(HGR) in alkaline solution was studie... The metal vapor synthesis (MVS) methed was used to prepare activatedcarbon supported nickel electrode. The electrocatalytic activity of the electrode forhydrogen evolution reaction(HGR) in alkaline solution was studied. Cathodicpolarization curves showed the electrocatalytic activity of Ni/C electrode prepared byMVS method was higher than that of the one prepared by conventional method. 展开更多
关键词 Activity Electrocatalytic Activity of Ni/C Electrodes Prepared by Metal Vapor Synthesis For Hydrogen Evolution in Alkaline Solution Ni
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Preliminary Investigation of NiAl-TiB_2 Composite Prepared by Reaction Milling 认领 引用 被引量：2
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作者 Lanzhang ZHOU and Jianting GUO 《Journal of Materials Science & Technology》 SCIE EI CAS 1999年第5期427-430,共4页
Reaction-milled NiAl-TiB2 composite was fabricated by mechanical alloying elemental powders and hot pressing. TiB2 particles are distributed mostly in grain boundaries of the matrix. The compressive strain to failure ... Reaction-milled NiAl-TiB2 composite was fabricated by mechanical alloying elemental powders and hot pressing. TiB2 particles are distributed mostly in grain boundaries of the matrix. The compressive strain to failure of the composite at RT is about twice that of cast NiAl. The compressive yield stress at high temperatures is about 4.5 times higher than that of extruded NiAl, and is also much stronger than XD NiAl-TiB2 composites. Deformation behavior between 1000~1100℃ with different strain rates has been investigated 展开更多
关键词 TiB NiAl Preliminary Investigation of NiAl-TiB2 Composite Prepared by Reaction Milling
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Ti/Al_2O_3 Functionally Gradient Material Prepared by the Explosive Compaction/SHS Process 认领 引用 被引量：2
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作者 Yimin LIZiqiao ZHENG 《Journal of Materials Science & Technology》 SCIE EI CAS 1999年第3期271-275,共5页
Ti1Al2O3 Functionally Gradient Material (FGM) was prepared by an explosive compaction/SHS process. Ten sheets of the compounding powder were laminated and pressed to get a green body of FGM. It was then compacted expl... Ti1Al2O3 Functionally Gradient Material (FGM) was prepared by an explosive compaction/SHS process. Ten sheets of the compounding powder were laminated and pressed to get a green body of FGM. It was then compacted explosively By burying the explosive compaction body into a stoichiometric Al/TiO2 mixture and igniting the combustion of the stoichiometric Al/TiO2 mixture, the SHS reaction of the explosive compaction body was initiated by the heat released from the combustion of the stoichiometric Al/TiO2 mixture. In this way, Ti/Al2O3 FGM was synthesized. The adiabatic temperatures of each gradient layer were calculated when the preheating temperatures were 298 K and 1173 K, respectively The microstructure, composition and properties of Ti/Al2O3 FGM and the reaction mechanism of each gradient layer were studied. It was found that Ti/Al2O3 FGM prepared by the explosive compaction/SHS process had a high density and a high microhardness. Its structure, composition and properties showed apparent gradient distribution. The structure of the standard stoichiometric ratio gradient layer of FGM was a network structure. Its reaction mode could be described as follows: Al powder melted first, then the molten Al penetrated into the TiO2 zone and reacted with TiO2, and big pores were left in the original positions of Al powder. The reaction of gradient layers with the addition of Al3O3 as diluents was similar to that of the standard stoichiometric ratio gradient layer, so were their structure and composition. However, the reaction of gradient layers with the addition of Ti as diluents was more complex and the composition deviated slightly from the designed one 展开更多
关键词 Al SHS Ti/Al2O3 Functionally Gradient Material Prepared by the Explosive Compaction/SHS Process
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Sintering of Doped, Nanocrystalline CeO_2 Powders Prepared under Hydrothermal Conditions 认领 引用 被引量：1
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作者 Yanchun ZHOUM.N.Rahaman 《Journal of Materials Science & Technology》 SCIE EI CAS 1995年第6期429-434,共6页
Nanocrystalline CeO2 powders (particle size ≈10-15 nm), doped with up to 20 at.-% of Mg,Ca or Y were prepared by chemical precipitation under hydrothermal conditions. The particle size and shape of the powders change... Nanocrystalline CeO2 powders (particle size ≈10-15 nm), doped with up to 20 at.-% of Mg,Ca or Y were prepared by chemical precipitation under hydrothermal conditions. The particle size and shape of the powders change slightly with the dopant concentrations. The the of the dopants on the sintering of the compacted powders was investigated during heating at a constant rate of 10℃/min. The elemental composition and the concentration of the dopant has significant efFect on the densification and grain growth. Compared to undoped CeO2, the dopants produce a shift in the densification curve to higher temperatures. For the same dopant concentration and under identical sintering conditions, the Ca doped samples reach nearly full density with the smallest grain size (≈50 nm), however, the Mg doped sample has the lowest density (≈95% of the theoretical) with the largest grain size (≈1 μm) 展开更多
关键词 Brook TGA Nanocrystalline CeO2 Powders Prepared under Hydrothermal Conditions Sintering of Doped
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Electrical Transport Properties of Type-Ⅷ Sn-Based Single-Crystalline Clathrates (Eu/Ba)8Ga16Sn30 Prepared by Ga Flux Method 认领 引用
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作者 Shu-Ping Deng Feng Cheng +6 位作者 De-Cong Li Yu Tang Zhong Chen Lan-Xian Shen Hong-Xia Liu Pei-Zhi Yang Shu-Kang Deng 《Chinese Physics Letters》 SCIE EI CAS CSCD 2017年第4期92-96,共5页
Single-crystalline samples of Eu/Ba-filled Sn-based type-Ⅷ clathrate are prepared by the Ga flux method with different stoichiometric ratios. The electrical transport properties of the samples are optimized by Eu dop... Single-crystalline samples of Eu/Ba-filled Sn-based type-Ⅷ clathrate are prepared by the Ga flux method with different stoichiometric ratios. The electrical transport properties of the samples are optimized by Eu doping. Results indicate that Eu atoms tend to replace Ba atoms. With the increase of the Eu initial content, the carrier density increases and the carrier mobility decreases, which leads to an increase of the Seebeck coefficient. By contrast, the electrical conductivity decreases. Finally, the sample with Eu initial content of x = 0.75 behaves with excellent electrical properties, which shows a maximal power factor of 1.51 mW·m^-1K^-2 at 480K, and the highest ZT achieved is 0.87 near the temperature of 483K. 展开更多
关键词 Seebeck Eu/Ba Electrical Transport Properties of Type Prepared by Ga Flux Method Sn-Based Single-Crystalline Clathrates Ba Ga
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Government responses to the COVID-19 pandemic of the Gulf Cooperation Council countries:good practices and lessons for future preparedness 认领 引用
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作者 Shu Chen Lei Guo +13 位作者 Yewei Xie Di Dong Rana Saber Mohammed Alluhidan Adwa Alamri Abdulrahman Alfaisal Nahar Alazemi Yahya M.Al‑Farsi Yazid A.Al Ohaly Yi Zhang Severin Rakic Mariam Hamza Christopher H.Herbst Shenglan Tang 《Global Health Research and Policy》 2024年第1期503-515,共13页
The COVID-19 pandemic has dramatically threatened the Gulf Cooperation Council(GCC)countries which have a large proportion of foreign workers.The governments of GCC countries have proactively implemented a com-prehens... The COVID-19 pandemic has dramatically threatened the Gulf Cooperation Council(GCC)countries which have a large proportion of foreign workers.The governments of GCC countries have proactively implemented a com-prehensive set of policy measures,and up to our knowledge,a systematic analysis of qualitative and quantitative evidence on the government response is still lacking.We summarized the GCC countries’government response and quantitatively measured that response using four indexes—the Government Response Index,the Stringency Index,the Vaccine Index,and the Initial Response Index,to analyse their response for future pandemic preparedness.Overall,the government response of all the GCC countries to the COVID-19 pandemic has been comprehensive,stringent,and timely.Notably,the GCC countries have implemented comprehensive vaccine policies.In addition,they have worked actively to protect foreign workers to improve their access to health services and secure their essential living conditions,regardless of their immigrant status.All the GCC countries dynamically adjusted their response to the evolving COVID-19 epidemiological burden and started to relax the stringency of the control poli-cies after the Omicron wave,though the governments had different response magnitudes as measured by the four indexes.These findings have provided several important lessons for future pandemic response and preparedness for countries with similar economic,demographic,and health contexts in(1)prompt actions of containment and clo-sure policies with dynamic adjusting,(2)strengthening health system policies,(3)comprehensive vaccination policies with universal access,(4)equitable and free access to testing,diagnosis,and treatment for all,and(5)strengthening the resilience of health systems. 展开更多
关键词 COVID-19 SARS-CoV-2 Pandemic preparedness Government response GCC countries Vaccine
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