Ví điện tử là gì? Các công bố khoa học về Ví điện tử
Ví điện tử là một loại phần mềm hoặc ứng dụng trên thiết bị di động hoặc trên trang web cho phép người dùng lưu trữ và quản lý tiền điện tử, thanh toán các dịch...
Ví điện tử là một loại phần mềm hoặc ứng dụng trên thiết bị di động hoặc trên trang web cho phép người dùng lưu trữ và quản lý tiền điện tử, thanh toán các dịch vụ và sản phẩm trực tuyến, chuyển tiền điện tử, và thậm chí cả mua bán tiền điện tử. Ví điện tử cũng có thể kết hợp với các dịch vụ ngân hàng truyền thống để cung cấp các tính năng thanh toán và giao dịch tiện lợi. Các ví điện tử phổ biến hiện nay bao gồm PayPal, Venmo, Apple Pay, Google Pay, và Cash App.
Ví điện tử thường liên kết với tài khoản ngân hàng hoặc thẻ tín dụng để nạp tiền vào ví và thực hiện các giao dịch. Ngoài ra, một số ví điện tử cũng có tính năng ví loại tiền điện tử như Bitcoin, Ethereum và các loại tiền điện tử khác.
Một số ưu điểm của ví điện tử bao gồm tính tiện lợi cho việc thanh toán trực tuyến và di động, tính an toàn khi không cần mang theo nhiều tiền mặt, và khả năng quản lý ngân sách cá nhân. Tuy nhiên, cũng có những rủi ro như bảo mật thông tin tài khoản, phí giao dịch và nạp/rút tiền.
Ví điện tử đang trở thành một công cụ thanh toán phổ biến và còn có tiềm năng phát triển trong tương lai khi mà giao dịch không dùng tiền mặt và tiền điện tử ngày càng trở nên phổ biến.
Ngoài việc sử dụng để thanh toán và quản lý tiền điện tử, ví điện tử cũng có thể hỗ trợ các dịch vụ tài chính khác như vay mượn tiền, đầu tư, và thậm chí cả việc quản lý bảo hiểm. Một số ví điện tử cũng cung cấp các tính năng tiết kiệm tiền hoặc đầu tư tự động.
Ngoài ra, ví điện tử cũng thường có tính năng quản lý chi tiêu, theo dõi lịch sử giao dịch và tạo ra báo cáo về tình hình tài chính cá nhân. Điều này giúp người dùng dễ dàng theo dõi và quản lý tài chính cá nhân một cách hiệu quả.
Cùng với sự phát triển của công nghệ, ví điện tử ngày càng trở nên đa dạng và tiện lợi, giúp người dùng tận dụng các dịch vụ tài chính một cách linh hoạt và hiệu quả hơn.
Danh sách công bố khoa học về chủ đề "ví điện tử":
Thermo-rheological behavior and compatibility of modified asphalt with various styrene–butadiene structures in SBS copolymers
Materials and Design - Tập 88 - Trang 177-185 - 2015
Plant survival in relation to seed size along environmental gradients: a long‐term study from semi‐arid and Mediterranean annual plant communities Summary 1. A positive relationship between seed size and subsequent offspring survival is a key assumption in ecological theory concerning life‐history strategies. Yet, this relationship is uncertain in respect to lifetime survival because sound evidence only exists for early seedling stages. Furthermore, the effect of environmental variation in space and time, and of contrasting plant functional groups, on this relationship has been scarcely examined. 2. Here, we investigated survival and between‐year variation therein. We tested for both whether their relationship to seed size (i) is maintained up until reproduction, (ii) changes along environmental gradients and (iii) differs between functional groups (grasses, legumes, forbs). 3. Survival was monitored from established seedlings to reproductive plants in 49 annual species under natural conditions during 7 years in three sites along a steep rainfall gradient. We then related average survival per species and between‐year variation in survival to seed size, site along the gradient and functional group. 4. Larger seed size was associated with higher survival and lower between‐year variation. Across the rainfall gradient, we detected no difference in the seed size–survival relationships; however, variation between years was lowest in the most mesic site where no relationship for between‐year variation with seed size was observed. Legumes showed lower survival and higher between‐year variation than grasses. 5. Our findings indicate that larger seed size provides survival advantages beyond seedling establishment up until reproduction among annual species. Larger seed size also provides a bet‐hedging strategy in temporally unpredictable environments. Increased abiotic favourability along environmental gradients may have little effect on survival rates but reduces survival variation between years and thus reduces the bet‐hedging benefit of larger seed size. We suggest that the contrasting response of legumes and grasses may partly result from their disparity in seed dormancy. 6. Synthesis . Current plant life‐history theory can be refined by accounting for both benefits of larger seed size, higher survival rates and bet‐hedging. Studies along environmental gradients are needed to generalize findings across ecosystems and to predict patterns of plant traits and plant performance under changing environmental conditions.
Journal of Ecology - Tập 98 Số 3 - Trang 697-704 - 2010
A review on integration of lightweight gradient lattice structures in additive manufacturing parts This review analyses the design, mechanical behaviors, manufacturability, and application of gradient lattice structures manufactured via metallic additive manufacturing technology. By varying the design parameters such as cell size, strut length, and strut diameter of the unit cells in lattice structures, a gradient property is obtained to achieve different levels of functionalities and optimize strength-to-weight ratio characteristics. Gradient lattice structures offer variable densification and porosities; and can combine more than one type of unit cells with different topologies which results in different performances in mechanical behavior layer-by-layer compared to non-gradient lattice structures. Additive manufacturing techniques are capable of manufacturing complex lightweight parts such as uniform and gradient lattice structures and hence offer design freedom for engineers. Despite these advantages, additive manufacturing has its own unique drawbacks in manufacturing lattice structures. The rules and strategies in overcoming the constraints are discussed and recommendations for future work were proposed.
Advances in Mechanical Engineering - Tập 12 Số 6 - Trang 168781402091695 - 2020
Estimation of environmental paleogradient values based on presence/absence data: a case study using benthic foraminifera for paleodepth estimation
Palaeogeography, Palaeoclimatology, Palaeoecology - Tập 217 Số 1-2 - Trang 115-130 - 2005
Plant speciation across environmental gradients and the occurrence and nature of hybrid zones Abstract Environmental gradients are very common and many plant species respond to them through adaptive genetic change. This can be a first step along a continuum of change that leads ultimately to the origin of fully reproductively isolated forms, i.e., ‘biological species’. Before complete reproductive isolation is achieved, hybrid zones may form between divergent lineages either through primary intergradation or secondary contact. Here, I review the literature on plant hybrid zones between native species and highlight: mode of origin (primary intergradation versus secondary contact); distribution among plant families, genera and life form; type and genotypic composition related to strength and type of reproductive isolation between parental lineages; nature of prezygotic and postzygotic reproductive barriers; level and direction of gene flow; and the stability of hybrid zones in the face of climate change. The total number of plant hybrid zones detected in a literature search was surprisingly small (137). This was the case even for areas of the world with a long history of research into plant evolution, ecology and systematics. Reasons for this are discussed, including the possibility that plant hybrid zones are naturally rare in the wild. Only for a few hybrid zones have attempts been made to distinguish between formation by primary intergradation or secondary contact, and it is assumed that most hybrid zones originate through secondary contact. From the limited information available, it appears that plant hybrid zones may frequently move in response to climate change, but long‐term studies are required to confirm this.
Journal of Systematics and Evolution - Tập 55 Số 4 - Trang 238-258 - 2017
Food‐web structure varies along environmental gradients in a high‐latitude marine ecosystem Large‐scale patterns in species diversity and community composition are associated with environmental gradients, but the implications of these patterns for food‐web structure are still unclear. Here, we investigated how spatial patterns in food‐web structure are associated with environmental gradients in the Barents Sea, a highly productive shelf sea of the Arctic Ocean. We compared food webs from 25 subregions in the Barents Sea and examined spatial correlations among food‐web metrics, and between metrics and spatial variability in seawater temperature, bottom depth and number of days with ice cover. Several food‐web metrics were positively associated with seawater temperature: connectance, level of omnivory, clustering, cannibalism, and high variability in generalism, while other food‐web metrics such as modularity and vulnerability were positively associated with sea ice and negatively with temperature. Food‐web metrics positively associated with habitat heterogeneity were: number of species, link density, omnivory, path length, and trophic level. This finding suggests that habitat heterogeneity promotes food‐web complexity in terms of number of species and link density. Our analyses reveal that spatial variation in food‐web structure along the environmental gradients is partly related to species turnover. However, the higher interaction turnover compared to species turnover along these gradients indicates a consistent modification of food‐web structure, implying that interacting species may co‐vary in space. In conclusion, our study shows how environmental heterogeneity, via environmental filtering, influences not only turnover in species composition, but also the structure of food webs over large spatial scales.
Ecography - Tập 42 Số 2 - Trang 295-308 - 2019
Visualization of the Ca2+-gradient in growing pollen tubes ofLilium longiflorum with chlorotetracycline fluorescence
Protoplasma - Tập 97 Số 4 - Trang 373-377 - 1978
Presenting the Results of Cochrane Systematic Reviews to a Consumer Audience: A Qualitative Study Objective. To develop and obtain feedback about a summary format for Cochrane reviews that is accessible to a consumer audience, without oversimplification or incorrect presentation. Methods. We developed 3 versions of a Plain Language Summary (PLS) format of a Cochrane Systematic Review. Using a semi-structured interview guide we tested these versions among 34 members of the public in Norway, Argentina, Canada, and Australia. The authors analyzed feedback, identified problems, and generated new solutions before retesting to produce a final version of a Plain Language Summary format. Results. Participants preferred results presented as words, supplemented by numbers in a table. There was a lack of understanding regarding the difference between a review and an individual study, that the effect is rarely an exact number, that evidence can be of low or high quality, and that level of quality is a separate issue from intervention effect. Participants also found it difficult to move between presentations of dichotomous and continuous outcomes. Rephrasing the introduction helped participants grasp the concept of a review. Confidence intervals were largely ignored or misunderstood. Our attempts to explain them were only partially successful. Text modifiers (‘‘probably,’’ ‘‘may’’) to convey different levels of quality were only partially understood, whereas symbols with explanations were more helpful. Participants often understood individual information elements about effect size and quality of these results, but did not always actively merge these elements. Conclusion. Through testing and iteration the authors identified and addressed several problems, using explanations, rephrasing, and symbols to present scientific concepts. Other problems remain, including how best to present confidence intervals and continuous outcomes. Future research should also test information elements in combination rather than in isolation. The new Plain Language Summary format is being evaluated in a randomized controlled trial.
Medical Decision Making - Tập 30 Số 5 - Trang 566-577 - 2010
Magnetic resonance imaging of the cervical spine: comparison of 2D T2-weighted turbo spin echo, 2D T2*weighted gradient-recalled echo and 3D T2-weighted variable flip-angle turbo spin echo sequences
European Radiology - Tập 19 Số 3 - Trang 713-721 - 2009
Aligning landscape structure with ecosystem services along an urban–rural gradient. Trade-offs and transitions towards cultural services
Springer Science and Business Media LLC - - 2019
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