Low-carbon technology for the rising middle class

This policy brief will discuss the role of local and international technology and innovation policies for low-carbon development of the rising middle class in developing countries. Although a large segment of the population of most developing countries remains severely deprived, most developing countries also have a significant and growing part of the population that could be a feasible target for low-carbon policies. In addition to how industrialised countries decide to reduce their emissions, a major determinant of the carbon intensity of the world economy and our collective ability to stay below 2°C global mean temperature rise, is how the rising middle class in developing countries will develop – along a low-carbon or a higher-carbon pathway. If this rising middle class could embark on a lower-carbon consumption pathway, for instance in their electricity use, their transportation demand and modes, their eating habits and other consumption patterns, this could structurally avoid a considerable amount of greenhouse gas emissions and yield other social, environmental and health benefits. As strong carbon policies incentivising such pathways are unlikely to happen soon in developing countries, technology policies can provide a solution, given they can be aimed at consumption patterns of the rising middle class specifically. This paper makes several case-based recommendations that can put those in developing countries that benefit from a more sustainable lifestyle on a low-carbon development path

Correlations of a bound interface over a random substrate

The correlation function of a one-dimensional interface over a random substrate, bound to the substrate by a pressure term, is studied by Monte-Carlo simulation. It is found that the height correlation , averaged over the substrate disorder, fits a form exp(-(j/b)^c) to a surprising precision in the full range of j where the correlation is non-negligible. The exponent c increases from 1.0 to 1.5 when the interface tension is taken larger and larger.Comment: 7 pages, 5 figure

Accelerating 3D printing for surface wettability research

The wettability of a surface is affected by its physical and chemical properties, but it can be modulated by patterning it. Researchers use many different techniques for surface patterning, each one with different trade-offs in terms of cost, flexibility, convenience and realizable geometries. Very high-resolution 3D printing technologies (such as stereolithography by two-photon absorption) have the potential to greatly increase the range of realizable surface geometries, but they are currently not in wide use because they are too slow for printing the relative large surface areas required for wetting experiments. To enable the use of these 3D techniques, we are developing new slicing algorithms able to speed up 3D-printing technologies.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech

Observing the Evolution of QUIC Implementations

The QUIC protocol combines features that were initially found inside the TCP, TLS and HTTP/2 protocols. The IETF is currently finalising a complete specification of this protocol. More than a dozen of independent implementations have been developed in parallel with these standardisation activities. We propose and implement a QUIC test suite that interacts with public QUIC servers to verify their conformance with key features of the IETF specification. Our measurements, gathered over a semester, provide a unique viewpoint on the evolution of a protocol and of its implementations. They highlight the arrival of new features and some regressions among the different implementations.Comment: 6 pages, 8 figure

Is superhydrophobicity robust with respect to disorder?

We consider theoretically the Cassie-Baxter and Wenzel states describing the wetting contact angles for rough substrates. More precisely, we consider different types of periodic geometries such as square protrusions and disks in 2D, grooves and nanoparticles in 3D and derive explicitly the contact angle formulas. We also show how to introduce the concept of surface disorder within the problem and, inspired by biomimetism, study its effect on superhydrophobicity. Our results, quite generally, prove that introducing disorder, at fixed given roughness, will lower the contact angle: a disordered substrate will have a lower contact angle than a corresponding periodic substrate. We also show that there are some choices of disorder for which the loss of superhydrophobicity can be made small, making superhydrophobicity robust

Low-carbon innovation for industrial sectors in developing countries

Low-carbon innovation in industrial sectors in developing countries presents economic opportunities that can help realise sustainable development pathways. Under business-as-usual, industries being established in developing countries are likely to move along carbon-intensive or inefficient pathways, increasing greenhouse gas emissions in the short term and the likelihood of establishing high-carbon lock-in over the longer term. However, there is a wealth of evidence from industrialisation experiences around the world demonstrating the kinds of strategies that make it possible to take advantage of low-carbon opportunities to instead create climate-compatible development pathways. This policy brief aims to illuminate potential pathways and policy actions for low-carbon innovation in emerging industry sectors in developing countries. It focusses, firstly, on the low-carbon and energy efficiency gains that are possible in energy-intensive manufacturing. Secondly, the brief explores opportunities for developing countries to insert themselves into global low-carbon value chains by developing manufacturing capacity in energy-supply technologies. The brief ends with policy recommendations that could be enacted at both the national and international levels, making use of existing institutions as well as learning from the literature on past industrialisation experiences

Multiresolution Layered Manufacturing

PURPOSE: Two-photon polymerization (TPP) has become one of the most popular techniques for stereolithography at very high resolutions. When printing relatively large structures at high resolutions, one of the main limiting factors is the printing time. The goal of this work is to present a new slicing algorithm to minimize printing times. DESIGN/METHODOLOGY/APPROACH: Typically, slicing algorithms used for TPP do not take into account the fact that TPP can print at a range of resolutions (i.e. with different heights and diameters) by varying parameters such as exposure time, laser power, photoresist properties, and optical arrangements. This work presents Multiresolution Layered Manufacturing (MLM), a novel slicing algorithm that processes 3D structures to separate parts manufacturable at low resolution from those that require a higher resolution. FINDINGS: MLM can significantly reduce the printing time of 3D structures at high resolutions. The maximum theoretical speed-up depends on the range of printing resolutions, but the effective speed-up also depends on the geometry of each 3D structure. RESEARCH LIMITATIONS/IMPLICATIONS: MLM opens the possibility to significantly decrease printing times, potentially opening the use of TPP to new applications in many disciplines such as microfluidics, metamaterial research or wettability. ORIGINALITY/VALUE: There are many instances of previous research on printing at several resolutions. However, in most cases, the toolpaths have to be manually arranged. In some cases, previous research also automates the generation of toolpaths, but they are limited in various ways. MLM is the first algorithm to comprehensively solve this problem for a wide range of true 3D structures.NANO3D (a BEWARE Fellowship from the Walloon Region, Belgium, part of the Marie Curie Programme of the ERC). IAP 7/38 MicroMAST (Interuniversity Attraction Poles Programme from the Belgian Science Policy Office, the Walloon Region and the FNRS)