The purpose of this review is to explore the intersection of computational engineering and biomedical science,highlighting the transformative potential this convergence holds for innovation in healthcare and medical r...The purpose of this review is to explore the intersection of computational engineering and biomedical science,highlighting the transformative potential this convergence holds for innovation in healthcare and medical research.The review covers key topics such as computational modelling,bioinformatics,machine learning in medical diagnostics,and the integration of wearable technology for real-time health monitoring.Major findings indicate that computational models have significantly enhanced the understanding of complex biological systems,while machine learning algorithms have improved the accuracy of disease prediction and diagnosis.The synergy between bioinformatics and computational techniques has led to breakthroughs in personalized medicine,enabling more precise treatment strategies.Additionally,the integration of wearable devices with advanced computational methods has opened new avenues for continuous health monitoring and early disease detection.The review emphasizes the need for interdisciplinary collaboration to further advance this field.Future research should focus on developing more robust and scalable computational models,enhancing data integration techniques,and addressing ethical considerations related to data privacy and security.By fostering innovation at the intersection of these disciplines,the potential to revolutionize healthcare delivery and outcomes becomes increasingly attainable.展开更多
This research aims to explore the decoration of TiO_(2) substrates with silver nanoparticles as a means of enhancing the photocatalytic oxidation of organic compounds.The results show that decorated TiO_(2) substrates...This research aims to explore the decoration of TiO_(2) substrates with silver nanoparticles as a means of enhancing the photocatalytic oxidation of organic compounds.The results show that decorated TiO_(2) substrates exhibit significantly higher photocatalytic activity in sunlight than undecorated substrates.Morphological analysis is performed,followed by optical and structural characterizations.Scanning electron microscopy analysis of the TiO_(2) reveals many nanotubular structures with particle sizes of∼134.4,148.8,and 132.7 nm at random locations.TiO_(2) is also found to have an absorbance range of 397.6 nm,from which it is known that the photocatalyst reacts in the presence of an ultraviolet source.From the Miller indices of the x-ray diffraction peaks,the preferred crystal orientation is found to be associated with a face-centered cubic structure with a crystallite size of 3.76 nm.Using these promising results,photocatalytic analysis is performed,revealing good degradation characteristics.This investigation reveals that TiO_(2) substrates coated with Ag nanoparticles possess significant potential for application in the photocatalytic oxidation of methylene blue dye,which is a crucial step toward establishing a cleaner environment.展开更多
Tissue engineering holds promise in developing materials for biological applications,such as bone tissue repair.This study focuses on bioabsorbable and biocompatible polymers like Poly(L-lactic acid)(PLLA),Polyurethan...Tissue engineering holds promise in developing materials for biological applications,such as bone tissue repair.This study focuses on bioabsorbable and biocompatible polymers like Poly(L-lactic acid)(PLLA),Polyurethane(PU),and Polycaprolactone(PCL),along with nanohydroxyapatite(nHA),an essential osteoconductive ceramic.The main objective was the development and characterization of scaffolds obtained by Rotary Jet Spinning(RJS)using PLLA,PU,and PCL incorporated with nHA,for bone-related applications.The resulting scaffolds exhibited uniform fiber morphology and a rough surface,ideal for effective bone-tissue interaction.The crystallinity indicated the scaffolds’bioactivity by apatite deposition in simulated body fluid.In addition,in vitro biological assays using preosteoblastic cells showed the biocompatibility of cells based on cell viability and adhesion parameters on the scaffolds.The results underscore the capacity of scaffolds incorporating nHA to promote both cell proliferation and osteoconduction,which are key elements essential for achieving effective bone regeneration.展开更多
Quantitative measurement of Soot Volume Fraction (SVF) is an essential prerequisite for controlling soot particle emissions from aero-engine combustors. As an in-situ and non-intrusive optical diagnostic technique, La...Quantitative measurement of Soot Volume Fraction (SVF) is an essential prerequisite for controlling soot particle emissions from aero-engine combustors. As an in-situ and non-intrusive optical diagnostic technique, Laser-Induced Incandescence (LII) has been increasingly applied for soot concentration quantification in various combustion environments such as laminar flame, vehicle exhaust, internal combustion chamber as well as aero-engine combustor. In this work, we experimentally measured the spatial and temporal distribution of SVF using two-color LII technique at the outlet of a single-sector dual-swirl aero-engine model combustor. The effect of inlet pressure and air preheat temperature on the SVF distribution was separately investigated within a pressure range of 241–425 kPa and a temperature range of 292–500 K. The results show that soot production increases with the inlet pressure but generally decreases with the air preheat temperature. Qualitative analysis was provided to explain the above results of parametric studies. The LII experiments were also conducted under 3 designed conditions to evaluate soot emission under practical operations. Particularly, weak soot emission was detected at the outlet under the idle condition. Our experimental results provide a valuable benchmark for evaluating soot emission in the exhaust plume of this aero-engine combustor during practical operations.展开更多
Rubberized concrete is one of the most studied applications of discarded tires and offers a promising approach to developing materials with enhanced properties.The rubberized concrete mixture results in a reduced modu...Rubberized concrete is one of the most studied applications of discarded tires and offers a promising approach to developing materials with enhanced properties.The rubberized concrete mixture results in a reduced modulus of elasticity and a reduced compressive and tensile strength compared to traditional concrete.This study employs finite element simulations to investigate the elastic properties of rubberized mortar(RuM),considering the influence of inclusion stiffness and interfacial debonding.Different homogenization schemes,including Voigt,Reuss,and mean-field approaches,are implemented using DIGIMAT and ANSYS.Furthermore,the influence of the interfacial transition zone(ITZ)between mortar and rubber is analyzed by periodic homogenization.Subsequently,the influence of the ITZ is examined through a linear fracture analysis with the stress intensity factor as a key parameter,using the ANSYS SMART crack growth tool.Finally,a non-linear study in FEniCS is carried out to predict the strength of the composite material through a compression test.Comparisons with high density polyethylene(HDPE)and gravel inclusions show that increasing inclusion stiffness enhances compressive strength far more effectively than simply improving the mortar/rubber bond.Indeed,when the inclusions are much softer than the surrounding matrix,any benefit gained on the elastic modulus or strength from stronger interfacial adhesion becomes almost negligible.This study provide numerical evidence that tailoring the rubber’s intrinsic stiffness—not merely strengthening the rubber/mortar interface—is a decisive factor for improving the mechanical performance of RuM.展开更多
Laser frequency combs,which are composed of a series of equally spaced coherent frequency components,have triggered revolutionary progress in precision spectroscopy and optical metrology.Length/distance is of fundamen...Laser frequency combs,which are composed of a series of equally spaced coherent frequency components,have triggered revolutionary progress in precision spectroscopy and optical metrology.Length/distance is of fundamental importance in both science and technology.We describe a ranging scheme based on chirped pulse interferometry.In contrast to the traditional spectral interferometry,the local oscillator is strongly chirped which is able to meet the measurement pulses at arbitrary distances,and therefore,the dead zones can be removed.The distances can be precisely determined via two measurement steps based on the time-of-flight method and synthetic wavelength interferometry,respectively.To overcome the speed limitation of the optical spectrum analyzer,the spectrograms are stretched and detected by a fast photodetector and oscilloscope and consequently mapped into the time domain in real time.The experimental results indicate that the measurement uncertainty can be well within±2μm,compared with the reference distance meter.The Allan deviation can reach 0.4μm at 4 ns averaging time and 25 nm at 1μs and can achieve 2 nm at 100μs averaging time.We also measured a spinning disk with grooves of different depths to verify the measurement speed,and the results show that the grooves with about 150 m∕s line speed can be clearly captured.Our method provides a unique combination of non-dead zones,ultrafast measurement speed,high precision and accuracy,large ambiguity range,and only one single comb source.This system could offer a powerful solution for field measurements in practical applications in the future.展开更多
The Trombe Wall(TW)is a low-cost,passive heating system known for its high thermal efficiency,particularly in cold and temperate climates.Recent research has explored its adaptability to warm-dry climates with high th...The Trombe Wall(TW)is a low-cost,passive heating system known for its high thermal efficiency,particularly in cold and temperate climates.Recent research has explored its adaptability to warm-dry climates with high thermal variability,such as those found in central Mexico.This study presents a dynamic simulation-based analysis of the TW’s thermal performance in a representative social housing unit located in Pachuca de Soto,Hidalgo.Two models were compared—one with a south-facing TW system and one without—to evaluate indoor thermal comfort throughout a full annual cycle.The simulations were conducted using OpenStudio and EnergyPlus,integrating detailed climate data and construction parameters.Results indicate significant improvements in interior temperature stability and comfort during winter,with temperature increases of up to 5.1℃ in living areas.The system’s implementation made it possible to attain a new level of average winter indoor temperature of 18.3℃ by using solar energy,up from 14.4℃ without mechanical heating.The introduction of the TW significantly reduces the interior thermal oscillation and enhances the habitability conditions during the winter,with an increase of 167%in the annual number of hours within the thermal comfort range of 18℃–24℃ vs.the base model.Currently,temperature fluctuations inside buildings due to climate change affect the health of users.The system presented in this study reduces these temperature fluctuations to improve quality of life.展开更多
目的:探讨三维打印β-磷酸三钙(β-Tricalcium Phosphate,β-TCP)颌骨修复支架的生物学特性及体内成骨作用。方法:采用自动注浆技术制作β-TCP支架,将前成骨细胞(MC35T3-E1)接种在支架上,扫描电镜(SEM)观察材料结构与细胞黏附,CCK-8法...目的:探讨三维打印β-磷酸三钙(β-Tricalcium Phosphate,β-TCP)颌骨修复支架的生物学特性及体内成骨作用。方法:采用自动注浆技术制作β-TCP支架,将前成骨细胞(MC35T3-E1)接种在支架上,扫描电镜(SEM)观察材料结构与细胞黏附,CCK-8法检测细胞增殖,ALP法检测碱性磷酸酶活性。将2种支架复合重组人骨形成蛋白-2(recombinant human bone morphogenetic protein-2,rhBMP-2)后植入大鼠体内,发泡法制作的β-TCP支架为对照组,6周后取材行组织学观察。结果:三维打印支架具有规则多孔的立体结构,适合细胞黏附,且增殖及分化能力均高于对照组(P<0.05)。组织学显示复合rhBMP-2后三维打印支架新骨生成量高于发泡法制作的β-TCP支架(P<0.05)。结论:三维打印TCP支架生物相容性良好,复合rhBMP-2后可异位成骨。展开更多
Osteoarthritis(OA)is a degenerative joint disease,typified by a loss of quality of cartilage and changes in bone at the interface of a joint,resulting in pain,stiffness,and reduced mobility."According to the Worl...Osteoarthritis(OA)is a degenerative joint disease,typified by a loss of quality of cartilage and changes in bone at the interface of a joint,resulting in pain,stiffness,and reduced mobility."According to the World Health Organization,40%of people over the age of 70 have OA.This joint disease展开更多
The Earth is taken as a triaxial rigid body, which rotates freely in the Euclidian space. The starting equations are the Euler dynamic equations, with A smaller than B and B smaller than C. The Euler equations are sol...The Earth is taken as a triaxial rigid body, which rotates freely in the Euclidian space. The starting equations are the Euler dynamic equations, with A smaller than B and B smaller than C. The Euler equations are solved, and the numerical results are provided. In the calculations, the following parameters are used: (C-B)/A=0.003 273 53; (B-A)/C=0.000 021 96; (C-A)/B=0.003 295 49, and the mean angular velocity of the Earth's rotation, ω =0.000 072 921 15 rad/s. Calculations show that, besides the self-rotation of the Earth and the free Euler procession of its rotation, there exists the free nutation: the nutation angle, or the angle between the Earth's momentary rotation axis and the mean axis that periodically change with time. The free nutation is investigated.展开更多
Laogang landfill near Shanghai is the largest landfill in China, and receives about 10000 t of daily garbage per day, Samples of topsoil and plants were analyzed to evaluate mercury pollution from the landfill. For to...Laogang landfill near Shanghai is the largest landfill in China, and receives about 10000 t of daily garbage per day, Samples of topsoil and plants were analyzed to evaluate mercury pollution from the landfill. For topsoil samples, there were significant correlations among total mercury （HgT）, combinative mercury （Hgc） and gaseous mercury （HgG）, and content of total organic carbon （TOC）, but, no significantly relationship was found between Hg content and filling time. Hg content changes in vertical profiles with time showed that the average Hgv of profiles 1992, 1996, and 2000 was similar, but their average HgG was quite different. HgT was significantly correlated with Hgc in profile 1992 and 2000, and Hgv was significantly correlated with Hg6 in profile 1996. HgG/Hgv ratio in profile samples decreased in the order of （HgG,/HgT）1992〉（HgG/HgT）1996〉〉（HgG/HgT）2000. A simple outline of Hg release in landfill could be drawn： with increasing of filling time, degradation undergoes different biodegradation, accordingly, gaseous mercury goes through small, more, and small proportion to total mercury. Distribution of Hg in plants was inhomogeneous, following the order of leaf〉root〉stem. The highest value of leaf may be associated with higher atmospheric Hg from landfill. Ligneous plants （e.g. Phyllostachys glanca, Prunus salicina and Ligustrum lucidum） are capable of enriching more Hg than herbaceous plants.展开更多
In the past few years, network RTK positioning technology, especially the VRS technology, has been widely used in some parts of China and in many countries around the world. The principle of the VRS technology is disc...In the past few years, network RTK positioning technology, especially the VRS technology, has been widely used in some parts of China and in many countries around the world. The principle of the VRS technology is discussed with corresponding formula deduction, and detailed descriptions and applications of VRS corrections and virtual observations generation algorithm are given.展开更多
The potential field determined based on the fictitious compress recovery approach is influenced by the errors contained in the boundary （the Earth＇s surface or the surface corresponding to the satellite altitude） v...The potential field determined based on the fictitious compress recovery approach is influenced by the errors contained in the boundary （the Earth＇s surface or the surface corresponding to the satellite altitude） values. Given the boundary value with definite accuracy, the accuracy of the field determined based on the fictitious compress recovery approach is estimated, and it is theoretically shown that the determined field has the same accuracy level as the given boundary value.展开更多
The performance of propulsion configurations with boundary layer ingestion（BLI） is affected to a large extent by the level of distortion in the inlet flow field. Through flow methods and parallel compressor have bee...The performance of propulsion configurations with boundary layer ingestion（BLI） is affected to a large extent by the level of distortion in the inlet flow field. Through flow methods and parallel compressor have been used in the past to calculate the effects of this aerodynamic integration issue on the fan performance; however high-fidelity through flow methods are computationally expensive, which limits their use at preliminary design stage. On the other hand, parallel compressor has been developed to assess only circumferential distortion. This paper introduces a discretized semi-empirical performance method, which uses empirical correlations for blade and performance calculations. This tool discretizes the inlet region in radial and circumferential directions enabling the assessment of deterioration in fan performance caused by the combined effect of both distortion patterns. This paper initially studies the accuracy and suitability of the semiempirical discretized method by comparing its predictions with CFD and experimental data for a baseline case working under distorted and undistorted conditions. Then a test case is examined,which corresponds to the propulsor fan of a distributed propulsion system with BLI. The results obtained from the validation study show a good agreement with the experimental and CFD results under design point conditions.展开更多
The existence of the Cretaceous-Tertiary （K/T） boundary in the non-marine succession is expected at Jiayin in the Heilongjiang River area, China. Zircons from a tuff sample from the Baishantou Member of Wuyun Format...The existence of the Cretaceous-Tertiary （K/T） boundary in the non-marine succession is expected at Jiayin in the Heilongjiang River area, China. Zircons from a tuff sample from the Baishantou Member of Wuyun Formation in Jiayin were analyzed by the laser ablation inductively coupled plasma mass spectrometry （LA-ICP-MS） U-Pb dating and fission-track dating methods. Ages of 64.1±0.7 Ma （U-Pb） and 61.7±1.8 Ma （fission-track dating） were obtained, which allow reevaluation of a previously reported late Maastrichian age for the tuff layer that was in conflict with the paleontological evidence. These results confirm the Danian age of the section in agreement with the paleontological evidence.展开更多
Solid-state cooling based on caloric effects is considered a viable alternative to replace the conventional vapor-compression refrigeration systems.Regarding barocaloric materials,recent results show that elastomers a...Solid-state cooling based on caloric effects is considered a viable alternative to replace the conventional vapor-compression refrigeration systems.Regarding barocaloric materials,recent results show that elastomers are promising candidates for cooling applications around room-temperature.In the present paper,we report supergiant barocaloric effects observed in acetoxy silicone rubber—a very popular,low-cost and environmentally friendly elastomer.Huge values of adiabatic temperature change and reversible isothermal entropy change were obtained upon moderate applied pressures and relatively low strains.These huge barocaloric changes are associated both to the polymer chain rearrangements induced by confined compression and to the first-order structural transition.The results are comparable to the best barocaloric materials reported so far,opening encouraging prospects for the application of elastomers in near future solid-state cooling devices.展开更多
文摘The purpose of this review is to explore the intersection of computational engineering and biomedical science,highlighting the transformative potential this convergence holds for innovation in healthcare and medical research.The review covers key topics such as computational modelling,bioinformatics,machine learning in medical diagnostics,and the integration of wearable technology for real-time health monitoring.Major findings indicate that computational models have significantly enhanced the understanding of complex biological systems,while machine learning algorithms have improved the accuracy of disease prediction and diagnosis.The synergy between bioinformatics and computational techniques has led to breakthroughs in personalized medicine,enabling more precise treatment strategies.Additionally,the integration of wearable devices with advanced computational methods has opened new avenues for continuous health monitoring and early disease detection.The review emphasizes the need for interdisciplinary collaboration to further advance this field.Future research should focus on developing more robust and scalable computational models,enhancing data integration techniques,and addressing ethical considerations related to data privacy and security.By fostering innovation at the intersection of these disciplines,the potential to revolutionize healthcare delivery and outcomes becomes increasingly attainable.
基金The authors thank,DST-FIST,Government of India for fund-ing toward infrastructure and instrumentation facilities at ACIC,St.Joseph’s College(Autonomous),Tiruchirappalli-620002,India.
文摘This research aims to explore the decoration of TiO_(2) substrates with silver nanoparticles as a means of enhancing the photocatalytic oxidation of organic compounds.The results show that decorated TiO_(2) substrates exhibit significantly higher photocatalytic activity in sunlight than undecorated substrates.Morphological analysis is performed,followed by optical and structural characterizations.Scanning electron microscopy analysis of the TiO_(2) reveals many nanotubular structures with particle sizes of∼134.4,148.8,and 132.7 nm at random locations.TiO_(2) is also found to have an absorbance range of 397.6 nm,from which it is known that the photocatalyst reacts in the presence of an ultraviolet source.From the Miller indices of the x-ray diffraction peaks,the preferred crystal orientation is found to be associated with a face-centered cubic structure with a crystallite size of 3.76 nm.Using these promising results,photocatalytic analysis is performed,revealing good degradation characteristics.This investigation reveals that TiO_(2) substrates coated with Ag nanoparticles possess significant potential for application in the photocatalytic oxidation of methylene blue dye,which is a crucial step toward establishing a cleaner environment.
基金financial support from FAPESP-Sao Paulo Research Foundation[grants #2020/07923-0,and #2023/11076-0]the National Council for Scientific and Technological Development-CNPq[grant #406514/2021-6].
文摘Tissue engineering holds promise in developing materials for biological applications,such as bone tissue repair.This study focuses on bioabsorbable and biocompatible polymers like Poly(L-lactic acid)(PLLA),Polyurethane(PU),and Polycaprolactone(PCL),along with nanohydroxyapatite(nHA),an essential osteoconductive ceramic.The main objective was the development and characterization of scaffolds obtained by Rotary Jet Spinning(RJS)using PLLA,PU,and PCL incorporated with nHA,for bone-related applications.The resulting scaffolds exhibited uniform fiber morphology and a rough surface,ideal for effective bone-tissue interaction.The crystallinity indicated the scaffolds’bioactivity by apatite deposition in simulated body fluid.In addition,in vitro biological assays using preosteoblastic cells showed the biocompatibility of cells based on cell viability and adhesion parameters on the scaffolds.The results underscore the capacity of scaffolds incorporating nHA to promote both cell proliferation and osteoconduction,which are key elements essential for achieving effective bone regeneration.
基金supported by the National Key Research and Development Program of China(No.2020YFA0405700).
文摘Quantitative measurement of Soot Volume Fraction (SVF) is an essential prerequisite for controlling soot particle emissions from aero-engine combustors. As an in-situ and non-intrusive optical diagnostic technique, Laser-Induced Incandescence (LII) has been increasingly applied for soot concentration quantification in various combustion environments such as laminar flame, vehicle exhaust, internal combustion chamber as well as aero-engine combustor. In this work, we experimentally measured the spatial and temporal distribution of SVF using two-color LII technique at the outlet of a single-sector dual-swirl aero-engine model combustor. The effect of inlet pressure and air preheat temperature on the SVF distribution was separately investigated within a pressure range of 241–425 kPa and a temperature range of 292–500 K. The results show that soot production increases with the inlet pressure but generally decreases with the air preheat temperature. Qualitative analysis was provided to explain the above results of parametric studies. The LII experiments were also conducted under 3 designed conditions to evaluate soot emission under practical operations. Particularly, weak soot emission was detected at the outlet under the idle condition. Our experimental results provide a valuable benchmark for evaluating soot emission in the exhaust plume of this aero-engine combustor during practical operations.
基金financial support from the Chilean National Agency for Research and Development(ANID),National Doctorate No.21212028financial support from ANID,FONDECYT Regular Research Project No.1221793.
文摘Rubberized concrete is one of the most studied applications of discarded tires and offers a promising approach to developing materials with enhanced properties.The rubberized concrete mixture results in a reduced modulus of elasticity and a reduced compressive and tensile strength compared to traditional concrete.This study employs finite element simulations to investigate the elastic properties of rubberized mortar(RuM),considering the influence of inclusion stiffness and interfacial debonding.Different homogenization schemes,including Voigt,Reuss,and mean-field approaches,are implemented using DIGIMAT and ANSYS.Furthermore,the influence of the interfacial transition zone(ITZ)between mortar and rubber is analyzed by periodic homogenization.Subsequently,the influence of the ITZ is examined through a linear fracture analysis with the stress intensity factor as a key parameter,using the ANSYS SMART crack growth tool.Finally,a non-linear study in FEniCS is carried out to predict the strength of the composite material through a compression test.Comparisons with high density polyethylene(HDPE)and gravel inclusions show that increasing inclusion stiffness enhances compressive strength far more effectively than simply improving the mortar/rubber bond.Indeed,when the inclusions are much softer than the surrounding matrix,any benefit gained on the elastic modulus or strength from stronger interfacial adhesion becomes almost negligible.This study provide numerical evidence that tailoring the rubber’s intrinsic stiffness—not merely strengthening the rubber/mortar interface—is a decisive factor for improving the mechanical performance of RuM.
基金supported by the National Key Research and Development Program of China(Grant No.2022YFC2204601)the National Natural Science Foundation of China(Grant Nos.11925503 and 12275093)+1 种基金the Natural Science Foundation of Hubei Province(Grant No.2021CFB019)the State Key Laboratory of Applied Optics(Grant No.SKLAO2022001A10).
文摘Laser frequency combs,which are composed of a series of equally spaced coherent frequency components,have triggered revolutionary progress in precision spectroscopy and optical metrology.Length/distance is of fundamental importance in both science and technology.We describe a ranging scheme based on chirped pulse interferometry.In contrast to the traditional spectral interferometry,the local oscillator is strongly chirped which is able to meet the measurement pulses at arbitrary distances,and therefore,the dead zones can be removed.The distances can be precisely determined via two measurement steps based on the time-of-flight method and synthetic wavelength interferometry,respectively.To overcome the speed limitation of the optical spectrum analyzer,the spectrograms are stretched and detected by a fast photodetector and oscilloscope and consequently mapped into the time domain in real time.The experimental results indicate that the measurement uncertainty can be well within±2μm,compared with the reference distance meter.The Allan deviation can reach 0.4μm at 4 ns averaging time and 25 nm at 1μs and can achieve 2 nm at 100μs averaging time.We also measured a spinning disk with grooves of different depths to verify the measurement speed,and the results show that the grooves with about 150 m∕s line speed can be clearly captured.Our method provides a unique combination of non-dead zones,ultrafast measurement speed,high precision and accuracy,large ambiguity range,and only one single comb source.This system could offer a powerful solution for field measurements in practical applications in the future.
文摘The Trombe Wall(TW)is a low-cost,passive heating system known for its high thermal efficiency,particularly in cold and temperate climates.Recent research has explored its adaptability to warm-dry climates with high thermal variability,such as those found in central Mexico.This study presents a dynamic simulation-based analysis of the TW’s thermal performance in a representative social housing unit located in Pachuca de Soto,Hidalgo.Two models were compared—one with a south-facing TW system and one without—to evaluate indoor thermal comfort throughout a full annual cycle.The simulations were conducted using OpenStudio and EnergyPlus,integrating detailed climate data and construction parameters.Results indicate significant improvements in interior temperature stability and comfort during winter,with temperature increases of up to 5.1℃ in living areas.The system’s implementation made it possible to attain a new level of average winter indoor temperature of 18.3℃ by using solar energy,up from 14.4℃ without mechanical heating.The introduction of the TW significantly reduces the interior thermal oscillation and enhances the habitability conditions during the winter,with an increase of 167%in the annual number of hours within the thermal comfort range of 18℃–24℃ vs.the base model.Currently,temperature fluctuations inside buildings due to climate change affect the health of users.The system presented in this study reduces these temperature fluctuations to improve quality of life.
基金国家自然科学基金(编号:81671029)国际口腔种植协会(International Team for Implantology+2 种基金ITI)基金(编号:881-2012)广东省科技计划项目(编号:2013B021800314)广东省科技计划项目(编号:2015B090920002)
文摘目的:探讨三维打印β-磷酸三钙(β-Tricalcium Phosphate,β-TCP)颌骨修复支架的生物学特性及体内成骨作用。方法:采用自动注浆技术制作β-TCP支架,将前成骨细胞(MC35T3-E1)接种在支架上,扫描电镜(SEM)观察材料结构与细胞黏附,CCK-8法检测细胞增殖,ALP法检测碱性磷酸酶活性。将2种支架复合重组人骨形成蛋白-2(recombinant human bone morphogenetic protein-2,rhBMP-2)后植入大鼠体内,发泡法制作的β-TCP支架为对照组,6周后取材行组织学观察。结果:三维打印支架具有规则多孔的立体结构,适合细胞黏附,且增殖及分化能力均高于对照组(P<0.05)。组织学显示复合rhBMP-2后三维打印支架新骨生成量高于发泡法制作的β-TCP支架(P<0.05)。结论:三维打印TCP支架生物相容性良好,复合rhBMP-2后可异位成骨。
基金funded from the European Union’s H2020-MSCA-RISE research and innovation programme,under grant agreement No.734156 (www.risebamos.eu)
文摘Osteoarthritis(OA)is a degenerative joint disease,typified by a loss of quality of cartilage and changes in bone at the interface of a joint,resulting in pain,stiffness,and reduced mobility."According to the World Health Organization,40%of people over the age of 70 have OA.This joint disease
基金Funded by the National Natural Science Foundation of China (No.40574004).
文摘The Earth is taken as a triaxial rigid body, which rotates freely in the Euclidian space. The starting equations are the Euler dynamic equations, with A smaller than B and B smaller than C. The Euler equations are solved, and the numerical results are provided. In the calculations, the following parameters are used: (C-B)/A=0.003 273 53; (B-A)/C=0.000 021 96; (C-A)/B=0.003 295 49, and the mean angular velocity of the Earth's rotation, ω =0.000 072 921 15 rad/s. Calculations show that, besides the self-rotation of the Earth and the free Euler procession of its rotation, there exists the free nutation: the nutation angle, or the angle between the Earth's momentary rotation axis and the mean axis that periodically change with time. The free nutation is investigated.
基金Project supported by the National Natural Science Foundation of China (No. 40676064, 30530150)and the Open Project Program of the Key Laboratory of Industrial Biotechnology, Ministry of Education, China (No. 214036).
文摘Laogang landfill near Shanghai is the largest landfill in China, and receives about 10000 t of daily garbage per day, Samples of topsoil and plants were analyzed to evaluate mercury pollution from the landfill. For topsoil samples, there were significant correlations among total mercury （HgT）, combinative mercury （Hgc） and gaseous mercury （HgG）, and content of total organic carbon （TOC）, but, no significantly relationship was found between Hg content and filling time. Hg content changes in vertical profiles with time showed that the average Hgv of profiles 1992, 1996, and 2000 was similar, but their average HgG was quite different. HgT was significantly correlated with Hgc in profile 1992 and 2000, and Hgv was significantly correlated with Hg6 in profile 1996. HgG/Hgv ratio in profile samples decreased in the order of （HgG,/HgT）1992〉（HgG/HgT）1996〉〉（HgG/HgT）2000. A simple outline of Hg release in landfill could be drawn： with increasing of filling time, degradation undergoes different biodegradation, accordingly, gaseous mercury goes through small, more, and small proportion to total mercury. Distribution of Hg in plants was inhomogeneous, following the order of leaf〉root〉stem. The highest value of leaf may be associated with higher atmospheric Hg from landfill. Ligneous plants （e.g. Phyllostachys glanca, Prunus salicina and Ligustrum lucidum） are capable of enriching more Hg than herbaceous plants.
基金Funded by the National 973 Program of China (No. 2006CB701301)the Basic Research of Geomatics and Geodesy of the Key Laboratory of Geo-space Environment and Geodesy, Ministry of Education, China (No. 03-04-10)the Project of University Education and Research of Hubei Province(No.20053039).
文摘In the past few years, network RTK positioning technology, especially the VRS technology, has been widely used in some parts of China and in many countries around the world. The principle of the VRS technology is discussed with corresponding formula deduction, and detailed descriptions and applications of VRS corrections and virtual observations generation algorithm are given.
基金Funded by the National Natural Science Foundation of China （No.40574004, No.40374004, No.40174004）.
文摘The potential field determined based on the fictitious compress recovery approach is influenced by the errors contained in the boundary （the Earth＇s surface or the surface corresponding to the satellite altitude） values. Given the boundary value with definite accuracy, the accuracy of the field determined based on the fictitious compress recovery approach is estimated, and it is theoretically shown that the determined field has the same accuracy level as the given boundary value.
基金the financial support provided by Escuela Politecnica Nacional for the development of the project PIMI 15-03 and PIJ 15-11Cranfield Departamental Grant for the support provided
文摘The performance of propulsion configurations with boundary layer ingestion（BLI） is affected to a large extent by the level of distortion in the inlet flow field. Through flow methods and parallel compressor have been used in the past to calculate the effects of this aerodynamic integration issue on the fan performance; however high-fidelity through flow methods are computationally expensive, which limits their use at preliminary design stage. On the other hand, parallel compressor has been developed to assess only circumferential distortion. This paper introduces a discretized semi-empirical performance method, which uses empirical correlations for blade and performance calculations. This tool discretizes the inlet region in radial and circumferential directions enabling the assessment of deterioration in fan performance caused by the combined effect of both distortion patterns. This paper initially studies the accuracy and suitability of the semiempirical discretized method by comparing its predictions with CFD and experimental data for a baseline case working under distorted and undistorted conditions. Then a test case is examined,which corresponds to the propulsor fan of a distributed propulsion system with BLI. The results obtained from the validation study show a good agreement with the experimental and CFD results under design point conditions.
基金the Project NSFC No30220130698the Project "111" of China for their support the National Science Council,Taiwan(grant 97-2811-M- 002-040)
文摘The existence of the Cretaceous-Tertiary （K/T） boundary in the non-marine succession is expected at Jiayin in the Heilongjiang River area, China. Zircons from a tuff sample from the Baishantou Member of Wuyun Formation in Jiayin were analyzed by the laser ablation inductively coupled plasma mass spectrometry （LA-ICP-MS） U-Pb dating and fission-track dating methods. Ages of 64.1±0.7 Ma （U-Pb） and 61.7±1.8 Ma （fission-track dating） were obtained, which allow reevaluation of a previously reported late Maastrichian age for the tuff layer that was in conflict with the paleontological evidence. These results confirm the Danian age of the section in agreement with the paleontological evidence.
文摘Solid-state cooling based on caloric effects is considered a viable alternative to replace the conventional vapor-compression refrigeration systems.Regarding barocaloric materials,recent results show that elastomers are promising candidates for cooling applications around room-temperature.In the present paper,we report supergiant barocaloric effects observed in acetoxy silicone rubber—a very popular,low-cost and environmentally friendly elastomer.Huge values of adiabatic temperature change and reversible isothermal entropy change were obtained upon moderate applied pressures and relatively low strains.These huge barocaloric changes are associated both to the polymer chain rearrangements induced by confined compression and to the first-order structural transition.The results are comparable to the best barocaloric materials reported so far,opening encouraging prospects for the application of elastomers in near future solid-state cooling devices.
