摘要：In this study we present the design and realization of a tunable dual band wireless power transfer(TDb-WPT)coupled resonator *** frequency response of the tunable band can be controlled using a surface-mounted *** transmitter(Tx)and the receiver(Rx)circuits are *** top layer contains a feed line with an impedance of 50Ω.Two identical half rings defected ground structures(HR-DGSs)are loaded on the bottom using a varactor *** propose a solution for restricted WPT systems working at a single band application according to the operating *** effects of geometry,orientation,relative distance,and misalignments on the coupling coefficients were *** validate the simulation results,the proposed TDb-WPT system was fabricated and *** system occupied a space of 40 mm×40 *** can deliver power to the receiver with an average coupling efficiency of 98%at the tuned band from 817 to 1018 MHz and an efficiency of 95%at a fixed band of 1.6 GHz at a significant transmission distance of 22 *** results of the measurements accorded well with those of an equivalent model and the simulation.

摘要：Improving structures involves comparing old and new designs on a key *** the percent change in performance is a method to *** paper proposes a cost-effective analogy by generating replicas of additive manufactured aluminum alloy(Al Si10Mg)body-centered cubic lattice(bCC)based turbine blade(T106C)with the same in poly-lactic acid(PLA)material and their comparison in the context of percent change for natural ***,a cavity is created inside the turbine blade(hollow blade).Natural frequencies are obtained experimentally and numerically by incorporating bCC at 50%and 80%of the cavity length into the hollow blade for both *** cost of manufacturing the metal blades is 90%more than that of the PLA *** two material blade designs show a similar percentage variation,as the first-order mode enhancs more than 5%and the second-order mode more than 4%.To observe the behavior in another material,both blades are analyzed numerically with a nickel-based U-500 material,and the same result is achieved,describing that percent change between designs can be verified using the PLA material.

摘要：种子艺术中心位于嘉兴市南湖区,距离市中心东侧10 km,处在城市与自然的过渡边界。项目定位为地产配套设施,近期作为附近社区的展示中心与零售空间,未来则活用为周边共享的邻里中心。艺术中心周围一半是农场与公园,一半是住宅与商业街,不同方位面向不同的景观与氛围,形成多元、生动的场所感。四周道路交会,人流聚集于此,是整个片区最具活力的核心点位。

摘要：1气候变化的原因全球气候变化除地球系统内部变率外,自然强迫和人为强迫是重要的外部驱动力。其中自然强迫包括太阳活动和火山活动。人为强迫即人类活动,包括大量化石燃料燃烧排放温室气体、土地利用,以及气溶胶与污染排放等,其强度取决于人口发展与变化、社会经济发展、技术变化及其内部的协调性等。本文重点给出人类强迫的影响。IPCC第六次评估报告明确表明,近百年特别是近几十年来观测到的全球变暖归因为人类活动的影响。

摘要：Melt extrusion-based additive manufacturing(ME-AM)is a promising technique to fabricate porous scaffolds for tissue engi-neering ***,most synthetic semicrystalline polymers do not possess the intrinsic biological activity required to control cell *** of biomolecules on polymeric surfaces of AM scaffolds enhances the bioactivity of a construct;however,there are limited strategies available to control the surface ***,we report a strategy to tune the surface density of bioactive groups by blending a low molecular weight poly(ε-caprolactone)5k(PCL5k)containing orthogonally reactive azide groups with an unfunctionalized high molecular weight PCL75k at different *** porous three-dimensional(3D)scaf-folds were then fabricated using a high weight percentage(75 wt.%)of the low molecular weight PCL *** a proof-of-concept test,we prepared films of three different mass ratios of low and high molecular weight polymers with a thermopress and reacted with an alkynated fluorescent model compound on the surface,yielding a density of 201-561 pmol/cm^(2).Subsequently,a bone morphogenetic protein 2(bMP-2)-derived peptide was grafted onto the films comprising different blend compositions,and the effect of peptide surface density on the osteogenic differentiation of human mesenchymal stromal cells(hMSCs)was *** two weeks of culturing in a basic medium,cells expressed higher levels of bMP receptor II(bMPRII)on films with the conjugated *** addition,we found that alkaline phosphatase activity was only significantly enhanced on films contain-ing the highest peptide density(i.e.,561 pmol/cm^(2)),indicating the importance of the surface *** together,these results emphasize that the density of surface peptides on cell differentiation must be considered at the cell-material ***,we have presented a viable strategy for ME-AM community that desires to tune the bulk and surface functionality via blending of(m

摘要：2022年10月,一只编号为b6的鸟创造了一项全新的世界纪录。然而,这项纪录在鸟类学界之外却鲜为人知。11天内,b6这只年轻的斑尾滕(Limosa lapponica)连续飞行超过1.3万千米,从它在美国阿拉斯加州的繁殖地,一直飞到澳大利亚塔斯马尼亚州的越冬地.

摘要：文章设计了一种行政审批系统。该系统采用J2EE技术和b/A/S(浏览器/应用程序服务器/数据库服务器)三层架构来设计网络程序和用户界面,结合Web Service、XML等数据交换形式来构建整个系统的通讯和数据的交换,实现了行政审批的网络化。

摘要：让·伊夫·布朗杜,在目前世界冰雪界已知的各种滑雪方式基础上,独创出了一种极具艺术性与运动活力的滑雪方式,打破了站立在双脚之上的传统单一滑行姿势。可以膝盖滑雪、全身俯地滑雪、后背俯地滑雪甚至手臂着地滑雪,几乎全身都可以利用起来,与地面接触进行滑雪动作,这就是小虫滑雪(buggy Ski)。他还研发了与该滑雪方式想匹配的的整套滑雪装备和一系列活体动作。

摘要：美国空军与Northrop公司研制的b-2先进技术轰炸机(ATb),如不出现大的设计问题或技术问题,预计会在1988年末进行首次飞行(原订于1987年)。这个飞翼式隐身ATb的首次公开展示和持续45分钟的首次飞行将在位于加州的Northrop Palmdale研究所和附近的爱德华空军基地的飞行试验中心进行。

摘要：尊敬的《俄罗斯文艺》主编及编辑们，亲爱的朋友们!谨以数以千计俄罗斯作家的名义，真诚地向你们祝贺这本出色的杂志创刊三十周年!我们大家都生活在一个非凡的时代，在最近二十年里我们两国的生活与工作规则都发生了根本性的变化，其中包括文学与艺术工作者的生活与工作规则。