To study the effects of bubbles (or cavities) collapse on a solid surface, a rotating disk device was used here to create bubbles (or bubbles) in water. In the apparatus, these bubbles are led to collapse on the surfa...To study the effects of bubbles (or cavities) collapse on a solid surface, a rotating disk device was used here to create bubbles (or bubbles) in water. In the apparatus, these bubbles are led to collapse on the surface of carbon steel (commonly used in structures and machine impellers), and so related to higher costs for the hydraulic machines industry when damaged by such phenomenon, for example. After that, the specimens are observed with the aid of a scanning electronic microscope, where the damages on the specimens are analyzed showing pits and approximate circular areas on their surfaces. An explanation is presented here, based on collapse simulations (for qualitative purposes) and their result using images of the specimens after the collapses to visualize the damages caused by prints on their surface. The pits are certainly made by liquid micro-jet impingement while the areas, showing some aspects of burning, are credited to the high temperature impaction of the bubble contents in the final stages of its collapse.展开更多
Masquerade culture is an essential part of Sekondi-Takoradi cultural embodiment. The masquerade festival titled Ankos displays interesting costumes that have artistic elements of potent colour display and performances...Masquerade culture is an essential part of Sekondi-Takoradi cultural embodiment. The masquerade festival titled Ankos displays interesting costumes that have artistic elements of potent colour display and performances. The masquerade costumes manifest intricate fabric decoration techniques for example pleating, folding, gathering, smocking, hand and machine stitching and the use of varied colour schemes. These decorative techniques make costume production laborious, tedious and downtime constraints. In contributing to the innovative approaches to creating textile designs and prints, the study explored the inspirational possibilities of surface designs of the masquerade costume for textile designs and prints. The art-based research design and direct observation as research instrumentation were employed in the artistic creation for the study. Adobe Photoshop was used in the simulation design processes. The study revealed that the simulation design processes produced an innovative imitated visual appearance of the masquerade costume and production processes from a machine-stitched work to a hand-printed fabric. It is recommended that costume makers adopt the contemporary possibility of using hand screen to print hitherto the traditional laborious and tedious process of producing masquerade costumes.展开更多
This paper is about New-Year woodcut prints done in the Taohuawu area of Suzhou in the Chinese Ming and Qing periods that influenced Edo period ukiyo-e. And Japanese ukiyo-e impacted Western Post-Impressionism. The su...This paper is about New-Year woodcut prints done in the Taohuawu area of Suzhou in the Chinese Ming and Qing periods that influenced Edo period ukiyo-e. And Japanese ukiyo-e impacted Western Post-Impressionism. The subject matters of Taohuawu en gravings came from Chinese folk life, and were highly decorative. The engravings were reasonably inexpensive for ordinary people. This art form influenced ukiyo-e directly. As a Japanese engraving expert wrote: "Chinese prints were a good model for Japanese engravings. Chi nese New-Year engravings moved Japanese ukiyo-e artists so much that the new idea of ukiyo-e was influenced largely by them." [1]展开更多
The article discusses fingerprints,which are the unique patterns of friction ridges found on the fingers and palms of hands.Fingerprints are highly valued as evidence in a court of law due to their uniqueness.Powder d...The article discusses fingerprints,which are the unique patterns of friction ridges found on the fingers and palms of hands.Fingerprints are highly valued as evidence in a court of law due to their uniqueness.Powder dusting is a common method for developing fingerprints on various surfaces,which involves applying finely formulated powders to the fingermark impression with a camel hairbrush.This work proposes the use of organic household materials such as water chestnut(Singhara flour)to develop powders for latent fingerprint development,which adhere to sweat and moisture on the surface of fingers,palms,and soles.The powder formulation sticks to the ridges,and the excess powder is blown away,resulting in multicolored patterns that provide an excellent outcome.The objective of the study is to offer an alternative to conventional,expensive,and toxic laboratory powders.These organic powders are eco‑friendly,cost‑effective,nontoxic,and readily available for use in crime scenes and future applications.展开更多
Aerogels are ultra-lightweight,porous materials defined by a complex network of interconnected pores and nanostructures,which effectively suppress heat transfer,making them exceptional for thermal insulation.Furthermo...Aerogels are ultra-lightweight,porous materials defined by a complex network of interconnected pores and nanostructures,which effectively suppress heat transfer,making them exceptional for thermal insulation.Furthermore,their porous architecture can trap and scatter light via multiple internal reflections,extending the optical path within the material.When combined with suitable light-absorbing materials,this feature significantly enhances light absorption(darkness).To validate this concept,mesoporous silica aerogel particles were incorporated into a resorcinol-formaldehyde(RF)sol,and the silica-to-RF ratio was optimized to achieve uniform carbon compound coatings on the silica pore walls.Notably,increasing silica loading raised the sol viscosity,enabling formulations ideal for direct ink writing processes with excellent shape fidelity for super-black topographical designs.The printed silica-RF green bodies exhibited remarkable mechanical strength and ultra-low thermal conductivity(15.8 m W m^(-1) K^(-1))prior to pyrolysis.Following pyrolysis,the composites maintained structural integrity and printed microcellular geometries while achieving super-black coloration(abs.99.56%in the 280-2500 nm range)and high photothermal conversion efficiency(94.2%).Additionally,these silica-carbon aerogel microcellulars demonstrated stable electrical conductivity and low electrochemical impedance.The synergistic combination of 3D printability and super-black photothermal features makes these composites highly versatile for multifunctional applications,including on-demand thermal management,and efficient solar-driven water production.展开更多
In the realm of secure information storage,optical encryption has emerged as a vital technique,particularly with the miniaturization of encryption devices.However,many existing systems lack the necessary reconfigurabi...In the realm of secure information storage,optical encryption has emerged as a vital technique,particularly with the miniaturization of encryption devices.However,many existing systems lack the necessary reconfigurability and dynamic functionality.This study presents a novel approach through the development of dynamic optical-to-chemical energy conversion metamaterials,which enable enhanced steganography and multilevel information storage.We introduce a micro-dynamic multiple encryption device that leverages programmable optical properties in coumarin-based metamaterials,achieved through a direct laser writing grayscale gradient strategy.This methodology allows for the dynamic regulation of photoluminescent characteristics and cross-linking networks,facilitating innovative steganographic techniques under varying light conditions.The integration of a multi-optical field control system enables real-time adjustments to the material’s properties,enhancing the device’s reconfigurability and storage capabilities.Our findings underscore the potential of these metamaterials in advancing the field of microscale optical encryption,paving the way for future applications in dynamic storage and information security.展开更多
3D printing,as a versatile additive manufacturing technique,offers high design flexibility,rapid prototyping,minimal material waste,and the capability to fabricate complex,customized geometries.These attributes make i...3D printing,as a versatile additive manufacturing technique,offers high design flexibility,rapid prototyping,minimal material waste,and the capability to fabricate complex,customized geometries.These attributes make it particularly well-suited for low-temperature hydrogen electrochemical conversion devices—specifically,proton exchange membrane fuel cells,proton exchange membrane electrolyzer cells,anion exchange membrane electrolyzer cells,and alkaline electrolyzers—which demand finely structured components such as catalyst layers,gas diffusion layers,electrodes,porous transport layers,and bipolar plates.This review provides a focused and critical summary of the current progress in applying 3D printing technologies to these key components.It begins with a concise introduction to the principles and classifications of mainstream 3D printing methods relevant to the hydrogen energy sector and proceeds to analyze their specific applications and performance impacts across different device architectures.Finally,the review identifies existing technical challenges and outlines future research directions to accelerate the integration of 3D printing in nextgeneration low-temperature hydrogen energy systems.展开更多
GENERAL INFORMATION International Journal of Ophthalmology—IJO,published continuously since 2008,a global ophthalmological scientific publication and a peer-reviewed,open access periodical published in print and onli...GENERAL INFORMATION International Journal of Ophthalmology—IJO,published continuously since 2008,a global ophthalmological scientific publication and a peer-reviewed,open access periodical published in print and online monthly(ISSN:2222-3959 print,ISSN:2227-4898 online).IJO is sponsored by the Chinese Medical Association Xi’an Branch,China and obtains guidance.It is indexed in SCI,PubMed,PubMed Central,Chemical Abstract,Scopus,EMBASE etc.The latest JCR IF is 1.8,Five-year Impact Factor is 1.8,CiteScore in 2024 is 2.8.展开更多
Limited by the sensitivity of laboratory techniques,conventional human DNA analysis of touch DNA on frequently used items and prints does not always provide satisfactory results.In this study,microbiome DNA on persona...Limited by the sensitivity of laboratory techniques,conventional human DNA analysis of touch DNA on frequently used items and prints does not always provide satisfactory results.In this study,microbiome DNA on personal computers,cell phones,and palm prints was analyzed and compared.After sample collection,DNA extraction,polymerase chain reaction amplification,library preparation,and sequencing,data were analyzed using the QIIME 1.8.0 software.Weighted unifrac distance between the right palm skin and the right side of a keyboard,the right palm skin and the mouse,and the left side of the keyboard and the left palm skin was 0.258850,0.265474,and 0.214098,respectively.Even after palm prints were left for 1 week,microbial community structures were still quite similar to those of samples collected from the palm skin on the day they were left(weighted unifrac distance was 0.270885).展开更多
BEFORE coming to China in 1986, I had spent months collecting all sorts of information on China and asking Chinese friends of mine about their everyday lives. So I felt fairly well informed before my trip. But when I ...BEFORE coming to China in 1986, I had spent months collecting all sorts of information on China and asking Chinese friends of mine about their everyday lives. So I felt fairly well informed before my trip. But when I landed in China, I was a bit disappointed. Everyihing looked so Western here. Of course, in Germany you never see a man kill a hen in the street for lunch or cabbages stacked on the sidewalk to dry in the sun. But overall, China’s streets resemble those in big cities all over the world. Looking at Western-style clothing, vehicles and modern buildings, somehow I missed the Chinese flair. I knew about China’s modernization drive, but I was展开更多
While the rising sun shines over each and every household/People would put up new peach wood charm for the old.These two poetic lines describe how people replace old woodblock prints for the coming New Year.To welcome...While the rising sun shines over each and every household/People would put up new peach wood charm for the old.These two poetic lines describe how people replace old woodblock prints for the coming New Year.To welcome the coming spring,a ceremony was held in the compound of the Beijing People’s Association for Friendship with Foreign Countries(BPAFFC)on Jan 8 for the China-展开更多
文摘To study the effects of bubbles (or cavities) collapse on a solid surface, a rotating disk device was used here to create bubbles (or bubbles) in water. In the apparatus, these bubbles are led to collapse on the surface of carbon steel (commonly used in structures and machine impellers), and so related to higher costs for the hydraulic machines industry when damaged by such phenomenon, for example. After that, the specimens are observed with the aid of a scanning electronic microscope, where the damages on the specimens are analyzed showing pits and approximate circular areas on their surfaces. An explanation is presented here, based on collapse simulations (for qualitative purposes) and their result using images of the specimens after the collapses to visualize the damages caused by prints on their surface. The pits are certainly made by liquid micro-jet impingement while the areas, showing some aspects of burning, are credited to the high temperature impaction of the bubble contents in the final stages of its collapse.
文摘Masquerade culture is an essential part of Sekondi-Takoradi cultural embodiment. The masquerade festival titled Ankos displays interesting costumes that have artistic elements of potent colour display and performances. The masquerade costumes manifest intricate fabric decoration techniques for example pleating, folding, gathering, smocking, hand and machine stitching and the use of varied colour schemes. These decorative techniques make costume production laborious, tedious and downtime constraints. In contributing to the innovative approaches to creating textile designs and prints, the study explored the inspirational possibilities of surface designs of the masquerade costume for textile designs and prints. The art-based research design and direct observation as research instrumentation were employed in the artistic creation for the study. Adobe Photoshop was used in the simulation design processes. The study revealed that the simulation design processes produced an innovative imitated visual appearance of the masquerade costume and production processes from a machine-stitched work to a hand-printed fabric. It is recommended that costume makers adopt the contemporary possibility of using hand screen to print hitherto the traditional laborious and tedious process of producing masquerade costumes.
文摘This paper is about New-Year woodcut prints done in the Taohuawu area of Suzhou in the Chinese Ming and Qing periods that influenced Edo period ukiyo-e. And Japanese ukiyo-e impacted Western Post-Impressionism. The subject matters of Taohuawu en gravings came from Chinese folk life, and were highly decorative. The engravings were reasonably inexpensive for ordinary people. This art form influenced ukiyo-e directly. As a Japanese engraving expert wrote: "Chinese prints were a good model for Japanese engravings. Chi nese New-Year engravings moved Japanese ukiyo-e artists so much that the new idea of ukiyo-e was influenced largely by them." [1]
文摘The article discusses fingerprints,which are the unique patterns of friction ridges found on the fingers and palms of hands.Fingerprints are highly valued as evidence in a court of law due to their uniqueness.Powder dusting is a common method for developing fingerprints on various surfaces,which involves applying finely formulated powders to the fingermark impression with a camel hairbrush.This work proposes the use of organic household materials such as water chestnut(Singhara flour)to develop powders for latent fingerprint development,which adhere to sweat and moisture on the surface of fingers,palms,and soles.The powder formulation sticks to the ridges,and the excess powder is blown away,resulting in multicolored patterns that provide an excellent outcome.The objective of the study is to offer an alternative to conventional,expensive,and toxic laboratory powders.These organic powders are eco‑friendly,cost‑effective,nontoxic,and readily available for use in crime scenes and future applications.
基金financially supported by the Swiss National Science Foundation(grant number IZLRZ2_164058)the China Scholarship Council Ph.D.student exchange programthe Priority Academic Program Development of Jiangsu Higher Education Institution(PAPD)。
文摘Aerogels are ultra-lightweight,porous materials defined by a complex network of interconnected pores and nanostructures,which effectively suppress heat transfer,making them exceptional for thermal insulation.Furthermore,their porous architecture can trap and scatter light via multiple internal reflections,extending the optical path within the material.When combined with suitable light-absorbing materials,this feature significantly enhances light absorption(darkness).To validate this concept,mesoporous silica aerogel particles were incorporated into a resorcinol-formaldehyde(RF)sol,and the silica-to-RF ratio was optimized to achieve uniform carbon compound coatings on the silica pore walls.Notably,increasing silica loading raised the sol viscosity,enabling formulations ideal for direct ink writing processes with excellent shape fidelity for super-black topographical designs.The printed silica-RF green bodies exhibited remarkable mechanical strength and ultra-low thermal conductivity(15.8 m W m^(-1) K^(-1))prior to pyrolysis.Following pyrolysis,the composites maintained structural integrity and printed microcellular geometries while achieving super-black coloration(abs.99.56%in the 280-2500 nm range)and high photothermal conversion efficiency(94.2%).Additionally,these silica-carbon aerogel microcellulars demonstrated stable electrical conductivity and low electrochemical impedance.The synergistic combination of 3D printability and super-black photothermal features makes these composites highly versatile for multifunctional applications,including on-demand thermal management,and efficient solar-driven water production.
基金the National Key R&D Program of China(Project No.2022YFB4700100)National Natural Science Foundation of China(Grant Nos.61973298)+2 种基金Hong Kong Research Grants Council(GRF Project Number 11216120)the CAS-RGC Joint Laboratory Funding Scheme(Project Number JLFS/E-104/18)the Innovation Promotion Research Association of the Chinese Academy of Sciences(NO.2022199)。
文摘In the realm of secure information storage,optical encryption has emerged as a vital technique,particularly with the miniaturization of encryption devices.However,many existing systems lack the necessary reconfigurability and dynamic functionality.This study presents a novel approach through the development of dynamic optical-to-chemical energy conversion metamaterials,which enable enhanced steganography and multilevel information storage.We introduce a micro-dynamic multiple encryption device that leverages programmable optical properties in coumarin-based metamaterials,achieved through a direct laser writing grayscale gradient strategy.This methodology allows for the dynamic regulation of photoluminescent characteristics and cross-linking networks,facilitating innovative steganographic techniques under varying light conditions.The integration of a multi-optical field control system enables real-time adjustments to the material’s properties,enhancing the device’s reconfigurability and storage capabilities.Our findings underscore the potential of these metamaterials in advancing the field of microscale optical encryption,paving the way for future applications in dynamic storage and information security.
基金the support from the National Natural Science Foundation of China(Nos.22208376,UA22A20429)the Qingdao New Energy Shandong Laboratory Open Project(QNESL OP 202303)+3 种基金Shandong Provincial Natural Science Foundation(Nos.ZR2024QB175,ZR2023LFG005)Fundamental Research Funds for the Central Universities(No.25CX07002A)National Natural Science Foundation of China(Z202401390008)The Hunan Provincial Natural Science Foundation(2025JJ60301)。
文摘3D printing,as a versatile additive manufacturing technique,offers high design flexibility,rapid prototyping,minimal material waste,and the capability to fabricate complex,customized geometries.These attributes make it particularly well-suited for low-temperature hydrogen electrochemical conversion devices—specifically,proton exchange membrane fuel cells,proton exchange membrane electrolyzer cells,anion exchange membrane electrolyzer cells,and alkaline electrolyzers—which demand finely structured components such as catalyst layers,gas diffusion layers,electrodes,porous transport layers,and bipolar plates.This review provides a focused and critical summary of the current progress in applying 3D printing technologies to these key components.It begins with a concise introduction to the principles and classifications of mainstream 3D printing methods relevant to the hydrogen energy sector and proceeds to analyze their specific applications and performance impacts across different device architectures.Finally,the review identifies existing technical challenges and outlines future research directions to accelerate the integration of 3D printing in nextgeneration low-temperature hydrogen energy systems.
文摘GENERAL INFORMATION International Journal of Ophthalmology—IJO,published continuously since 2008,a global ophthalmological scientific publication and a peer-reviewed,open access periodical published in print and online monthly(ISSN:2222-3959 print,ISSN:2227-4898 online).IJO is sponsored by the Chinese Medical Association Xi’an Branch,China and obtains guidance.It is indexed in SCI,PubMed,PubMed Central,Chemical Abstract,Scopus,EMBASE etc.The latest JCR IF is 1.8,Five-year Impact Factor is 1.8,CiteScore in 2024 is 2.8.
基金This work has received funding from the State Key Laboratory of Pathogen and Biosecurity(xxhz201510)Shanghai Research Institute of Criminal Science and Technology(2014XCWZK14).
文摘Limited by the sensitivity of laboratory techniques,conventional human DNA analysis of touch DNA on frequently used items and prints does not always provide satisfactory results.In this study,microbiome DNA on personal computers,cell phones,and palm prints was analyzed and compared.After sample collection,DNA extraction,polymerase chain reaction amplification,library preparation,and sequencing,data were analyzed using the QIIME 1.8.0 software.Weighted unifrac distance between the right palm skin and the right side of a keyboard,the right palm skin and the mouse,and the left side of the keyboard and the left palm skin was 0.258850,0.265474,and 0.214098,respectively.Even after palm prints were left for 1 week,microbial community structures were still quite similar to those of samples collected from the palm skin on the day they were left(weighted unifrac distance was 0.270885).
文摘BEFORE coming to China in 1986, I had spent months collecting all sorts of information on China and asking Chinese friends of mine about their everyday lives. So I felt fairly well informed before my trip. But when I landed in China, I was a bit disappointed. Everyihing looked so Western here. Of course, in Germany you never see a man kill a hen in the street for lunch or cabbages stacked on the sidewalk to dry in the sun. But overall, China’s streets resemble those in big cities all over the world. Looking at Western-style clothing, vehicles and modern buildings, somehow I missed the Chinese flair. I knew about China’s modernization drive, but I was
文摘While the rising sun shines over each and every household/People would put up new peach wood charm for the old.These two poetic lines describe how people replace old woodblock prints for the coming New Year.To welcome the coming spring,a ceremony was held in the compound of the Beijing People’s Association for Friendship with Foreign Countries(BPAFFC)on Jan 8 for the China-
