Super slim multiband inverted-F antenna for GSM/DCS/PCS operation

This paper presents the design of a super slim multiband wrapped inverted-F antenna that covers the frequency bands allocated for GSM, DCS and PCS wireless services. In the first step, the quarter-wavelength size (at 850 MHz) open-end arm of an inverted-F radiator is folded and meandered. Then the antenna is wrapped using a fourth-order folding technique to reduce its projection area to only 40 x 10 x 3mm. Full wave EM simulations show that the antenna excites a lower mode resonance at about 850MHz and a higher one at about 1900MHz. Its radiation pattern is nearly omni-directional with a gain of about 2.5dBi at the lower band and 4.6dBi at the upper band. A prototype of the proposed antenna is fabricated and tested. A close agreement between simulated and measured result is achieved. The measured 6-dB return loss or VSWR 3:1 bandwidths for the lower and upper resonances are 200MHz (770 to 970 MHz) and 280MHz (1710 to 1990 MHz) respectively. These bandwidths are sufficient to cover GSM 850/900/1800/1900MHz, DCS 1800MHz and PCS 1900MHz bands. Because of its compact volume the proposed antenna is a very attractive candidate for modern slim size portable transceivers

Towards the knittability of graphene oxide fibres

Recent developments in graphene oxide fibre (GO) processing include exciting demonstrations of hand woven textile structures. However, it is uncertain whether the fibres produced can meet the processing requirements of conventional textile manufacturing. This work reports for the first time the production of highly flexible and tough GO fibres that can be knitted using textile machinery. The GO fibres are made by using a dry-jet wet-spinning method, which allows drawing of the spinning solution (the GO dispersion) in several stages of the fibre spinning process. The coagulation composition and spinning conditions are evaluated in detail, which led to the production of densely packed fibres with near-circular cross-sections and highly ordered GO domains. The results are knittable GO fibres with Young\u27s modulus of ~7.9 GPa, tensile strength of ~135.8 MPa, breaking strain of ~5.9%, and toughness of ~5.7 MJ m(-3). The combination of suitable spinning method, coagulation composition, and spinning conditions led to GO fibres with remarkable toughness; the key factor in their successful knitting. This work highlights important progress in realising the full potential of GO fibres as a new class of textile

Influence Of Engineered Soil Media Composition To The Hydraulic Performance In Rain Garden System

Stormwater had been identified as one of the factor that causes surface runoff on the ground. The runoff is caused by the inability of the water to infiltrate into the soil, causing the water to stay on the ground and causes major problems such as flooding and water ponds. Rain garden is one of the best management practice approach in handling this matter. A rain garden promotes infiltration to the soil beneath, reducing the surface runoff thus solving floods problems. The objective of this study is to investigate the effects of soil media composition to the hydraulic performance in a rain garden system. Three types of soil media composition is used, which are fine river sand, coarse river sand, and leaf composts, which are made up of shredded dry leaves. The study is done by using sand column to represent a bioretention system, which are divided into three layers; the drainage layer, soil filter layer and ponding layer at the top. In order to analyse the hydraulic performance of the system, a few parameters had been identified as indicators in this study, which are the flow of water, soil hydraulic conductivity, water removal efficiency, and water holding capacity. A coarser grain material had been known to give a greater flow and hydraulic conductivity, however, an addition of fine sand and leaf composts helps in water removal and water drainage, which is also a good parameter for a better rain garden system. Keywords: rain garden, best management practice, hydraulic conductivity, soil media composition, water removal efficienc

Controlling the dynamic percolation of carbon nanotube based conductive polymer composites by addition of secondary nanofillers: The effect on electrical conductivity and tuneable sensing behaviour

In this paper, the electrical properties of ternary nanocomposites based on thermoplastic polyurethane (TPU) and multi-walled carbon nanotubes (MWCNTs) are studied. In particular two nanofillers - differing in shape and electrical properties - are used in conjunction with MWCNTs: an electrically conductive CB and an insulating needle-like nanoclay, sepiolite. The ternary nanocomposites were manufactured in a number of forms (extruded pellets, filaments and compression moulded films) and their morphological and electrical properties characterised as function of time and temperature. The presence of both secondary nanofillers is found to affect the formation of a percolating network of MWCNTs in TPU, inducing a reduced percolation threshold and tuneable strain sensing ability. These ternary nanocomposites can find application as conductive and multi-functional materials for flexible electronics, sensing films and fibres in smart textiles. (c) 2012 Elsevier Ltd. All rights reserved

Implications of the Forest Charges Law to Rattan-based Livelihoods of Indigenous Peoples of the Philippines

This policy research investigated the question: What are the implications of Republic Act 7161 (or the Forest Charges Law) as it is interpreted, imposed, and implemented towards sustainable rattan-based livelihoods of indigenous peoples (IP) communities in the Philippines? An in-depth review and analysis of the Act was undertaken by examining the past policies, relevant administrative orders, and memorandum circulars issued by the Department of Environment and Natural Resources (DENR) and relevant forerunner agencies. The policy performance of forest charges via-a-vis collection and resource conservation targets and the perceptions of the IP communities towards RA 7161 were assessed. Results provide evidence that the provision of the Act on rattan forest charges is disadvantageous to IP rattan gatherers who usually gather the rattan raw material for the rattan value chain and play a crucial role in achieving the goals of sustainable forest management. Recommendations are provided toward creating a more favorable policy environment beneficial to IP practices on rattan harvesting and utilization

Influence Of Engineered Soil Media Composition To The Hydraulic Performance In Rain Garden System

Stormwater had been identified as one of the factor that causes surface runoff on the ground. The runoff is caused by the inability of the water to infiltrate into the soil, causing the water to stay on the ground and causes major problems such as flooding and water ponds. Rain garden is one of the best management practice approach in handling this matter. A rain garden promotes infiltration to the soil beneath, reducing the surface runoff thus solving floods problems. The objective of this study is to investigate the effects of soil media composition to the hydraulic performance in a rain garden system. Three types of soil media composition is used, which are fine river sand, coarse river sand, and leaf composts, which are made up of shredded dry leaves. The study is done by using sand column to represent a bioretention system, which are divided into three layers; the drainage layer, soil filter layer and ponding layer at the top. In order to analyse the hydraulic performance of the system, a few parameters had been identified as indicators in this study, which are the flow of water, soil hydraulic conductivity, water removal efficiency, and water holding capacity. A coarser grain material had been known to give a greater flow and hydraulic conductivity, however, an addition of fine sand and leaf composts helps in water removal and water drainage, which is also a good parameter for a better rain garden system. Keywords: rain garden, best management practice, hydraulic conductivity, soil media composition, water removal efficienc

Market Opportunity Analysis and Value Proposition Design for the Entry of Yellowjet, a Philippine Low Cost Airline to European Market

Yellowjet's mission is to become the most successful low cost carrier in the world and with the recent EU regulation allowing re-entry of airlines from the Philippines in European air-space, this presents a good opportunity for its expansion in the international market. It has also recently adopted a low cost-long haul strategy which in turn allows them to have the necessary capabilities to expand given its purchases of widebody aircraft. Given the saturation of Asian markets, Yellowjet is then forward-looking into expanding into Europe in order to serve and bring its branded low-cost and fun flying experiences to the overseas Filipinos and to foreign tourists to travel and explore the Philippines. This thesis has three major components, beginning with opportunity analysis which takes a look at the internal and external environment in order to identify which specific European country Yellowjet will enter. After choosing the country, the different target segments and their customer profiles will be discussed. An analysis of their different jobs, pains and gains will be matched with the features and benefits offered by Yellowjet. This will form the customer value propositions. Lastly, the project for the marketing entry strategy will be described including the elements of the service marketing mix.Cílem Yellowjet je stát se nejúspěšnějším "low cost" dopravcem na světě. V důsledku nedávné regulace EU, která umožňuje opětovný vstup leteckých společností z Filipín do evropského vzdušného prostoru, s ohledem na rozšíření na mezinárodním trhu se jedná o dobrou příležitost pro Yellowjet. Yellowjet přijal novou strategii a koupí širších letadel nabídne klientům lety na delší vzdálenosti, čímž uspokojí poptávku současných zákazníku. Vzhledem k nasycení trhu na asijských trzích, Yellowjet je hledá příležitosti a expanduje do Evropy, aby nabídl své "low cost" služby. Bude se také orientovat na zahraniční turisty a lákat je k objevování Filipín. Tato práce má tři hlavní složky, počínaje analýzou příležitostí, která zachycuje situaci na vnitřním a vnějším prostředí s cílem určit, na které konkrétní evropské země Yellowjet vstoupí. Po výběru země budou popsány různé cílové segmenty zákazníků a jejich profily. Analýza zahrnuje všechny příležitosti a hrozby a spolu s analýzou výhod je sestavena hodnotová propozice. Na závěr bude sepsána projektová strategie vstupu na trh, včetně prvků marketingového mixu.Ústav managementu a marketing

The Future of MXene Fibers

\ua9 2025 The Author(s). Advanced Materials published by Wiley-VCH GmbH.Since the first report on MXene-coated fibers in 2017, the field has grown rapidly, with over 1500 publications on fiber-related advancements. Improved understanding of MXene\u27s colloidal dispersions has led to new fabrication techniques, resulting in fibers with exceptional electrical conductivity and electrochemical properties. These fibers show promise in energy storage, wearable electronics, motion and strain sensors, and electromagnetic interference shielding. Ongoing research is focused on improving their mechanical properties and fabrication methods, as well as new applications. As new MXene compositions and their properties are discovered, the field continues to open new avenues for innovation in functional fibers and textiles enabled using MXenes. This perspective explores the broad applications of MXene fibers, often overlooked in fiber-focused reviews, and emphasizes the need to address gaps in synthesis, scalability, and long-term performance to fully realize their potential