Energy Efficiency Trade-Off Between Duty-Cycling and Wake-Up Radio Techniques in IoT Networks

Wireless Personal Communications - For robust monitoring, control and proper energy management of renewable energy sources (RES), wireless sensing networks (WSNs) are proved to be a vital solution....     

Novel Engineered Ion Channel Provides Controllable Ion Permeability for Polyelectrolyte Microcapsules Coated with a Lipid Membrane

The development of nanostructured microcapsules based on a biomimetic lipid bilayer membrane (BLM) coating of poly(sodium styrenesulfonate) (PSS)/poly(allylamine hydrochloride) (PAH) polyelectrolyte hollow microcapsules is reported. A novel engineered ion channel, gramicidin (bis‐gA), incorporated into the lipid membrane coating provides a functional capability to control transport across the microcapsule wall. The microcapsules provide transport and permeation for drug‐analog neutral species, as well as positively and negatively charged ionic species. This controlled transport can be tuned for selective release biomimetically by controlling the gating of incorporated bis‐gA ion channels. This system provides a platform for the creation of “smart” biomimetic delivery vessels for the effective and selective therapeutic delivery and targeting of drugs.     

Modular and Versatile Spatial Functionalization of Tissue Engineering Scaffolds through Fiber‐Initiated Controlled Radical Polymerization

Native tissues are typically heterogeneous and hierarchically organized, and generating scaffolds that can mimic these properties is critical for tissue engineering applications. By uniquely combining controlled radical polymerization (CRP), end‐functionalization of polymers, and advanced electrospinning techniques, a modular and versatile approach is introduced to generate scaffolds with spatially organized functionality. Poly‐ε‐caprolactone is end functionalized with either a polymerization‐initiating group or a cell‐binding peptide motif cyclic Arg‐Gly‐Asp‐Ser (cRGDS), and are each sequentially electrospun to produce zonally discrete bilayers within a continuous fiber scaffold. The polymerization‐initiating group is then used to graft an antifouling polymer bottlebrush based on poly(ethylene glycol) from the fiber surface using CRP exclusively within one bilayer of the scaffold. The ability to include additional multifunctionality during CRP is showcased by integrating a biotinylated monomer unit into the polymerization step allowing postmodification of the scaffold with streptavidin‐coupled moieties. These combined processing techniques result in an effective bilayered and dual‐functionality scaffold with a cell‐adhesive surface and an opposing antifouling non‐cell‐adhesive surface in zonally specific regions across the thickness of the scaffold, demonstrated through fluorescent labelling and cell adhesion studies. This modular and versatile approach combines strategies to produce scaffolds with tailorable properties for many applications in tissue engineering and regenerative medicine.     

群创挤入iSuppli 前十大ODM行列

2006年，香港冠捷科技有限公司（TPV）年收入实现72亿美元，成功晋级前十强。2007年，群创光电年收入超过30亿美元，成为ODM精英分子。此外，尽管受季节性因素影响，前十大ODM厂商2007年第二季度收入普遍下滑，但群创当期收入保持增长（参见图1）。继冠捷和群刨将其商业模式转为主攻品牌产品之后，它们分别取代了明基和宏达电在iSuppli ODM排名中的地位。[第一段]     

Automatic computation of histogram threshold for lip segmentation using feedback of shape information

Threshold-based segmentation methods provide a simple and efficient way to implement lip segmentation. However, automatic computation of robust thresholds presents a major challenge. This research proposes an adaptive method for selecting the histogram threshold, based on feedback of shape information. The proposed method reduces unnecessary overhead by first comparing the initial segmentation to a reference lip shape model to decide if optimisation is required. In cases where optimisation is required, the algorithm adjusts the threshold until the segmentation is sufficiently similar to a reference shape model. The algorithm is tested on the AR Face Database by comparing the segmentation accuracy before and after optimisation. The proposed method increases the number of segmentations classified as ‘good’ (overlap above 90 %) by 7.1 % absolute, and significantly improves the segmentation in challenging cases containing facial hair.     

下一代手机设计的集成技术

为了满足对于高度集成的无线电半导体解决方案日益增长的需求，蜂窝电话的技术创新正在沿着两个不同的方向发展。其一是在芯片级和封装级的功能集成，其二是完整的半导体系统解决方案。后者将所有必须的芯片、模块和软件捆绑到一个全面的解决方案中，从而简化了设计步骤．加快了产品进入市场的时间。     

A Patterned 3D Silicon Anode Fabricated by Electrodeposition on a Virus‐Structured Current Collector

Electrochemical methods were developed for the deposition of nanosilicon onto a 3D virus‐structured nickel current collector. This nickel current collector is composed of self‐assembled nanowire‐like rods of genetically modified tobacco mosaic virus (TMV1cys), chemically coated in nickel to create a complex high surface area conductive substrate. The electrochemically depo­sited 3D silicon anodes demonstrate outstanding rate performance, cycling stability, and rate capability. Electrodeposition thus provides a unique means of fabricating silicon anode materials on complex substrates at low cost.     

能实现高压输出的抽头电感升压稳压器

当您面对产生比可用电源电压更高的稳定电压任务时,可以考虑升压稳压器。虽然升压转换器在理论上能产生比其输入更高的几乎任何电压,但实际的考虑把输出限制为对其施加的电压的大约8倍。为了产生更高的电压,可考虑使用抽头电感升压拓扑结构。图1展示了某种转换器的实现,它把3V输入提高到了100Vdc。稳压器芯片的连接类似于传统升压转换器的连接,但为了达到很高的升压比,该设计使用了L1,即一个1:6匝数比的抽头电感。图2中的波形示出了输入电压、电源开关IC1输出端(5号引脚SW)的电压、整流二极管D1的阳极电压。如同任何升压电路一样,当IC1…