Abstract
This paper presents an AC optimal power flow (AC-OPF) model including flexible resources (FRs) to handle uncertain wind power generation (WPG). The FRs considered are thermal units with up/down re-dispatching capability, corrective topology control (CTC), and thyristor-controlled series capacitors (TCSC). WPG uncertainty has been modeled through a proposed interval-based robust approach, the goal of which is to maximize the variation range of WPG uncertainty in power systems while maintaining an adequate reliability level at a reasonable cost with the aid of FRs. However, utilization of FRs (especially CTC and TCSC devices) is limited due to the difficulty of their incorporation in the AC-OPF. The optimization framework of the full FR-augmented AC-OPF problem is a mixed-integer nonlinear programming (MINLP) in which the solution for large-scale systems is very hard to obtain. To solve this issue, this paper uses a two-stage decomposition algorithm to decompose the MINLP representation into a mixed-integer linear program (MILP) and a nonlinear program (NLP). Finally, the robust AC-OPF model with FRs is implemented and tested on a 6-bus and the IEEE 118-bus test systems to evaluate its efficiency and performance.

Abstract
European energy strategy towards decarbonization, and its practical implementations in the different EU countries, will imply a continuous increase of variable (non-dispatchable) renewable energy (VRE), like wind and solar PV generation. This increasing VRE along with the progressive closing of current greenhouse gas (GHG) emitting plants, will decrease the net demand (inflexible demand minus non-dispatchable generation), reducing the amount of dispatchable generation needed to face both low VRE periods and larger net demand ramps. These problems need to be assessed to anticipate possible mismatches between net demand values and ramps, and the available resources with generation and ramping capabilities, so that the security and quality of supply is guaranteed. In case of expected risk, regulatory mechanisms, such as new market clearing rules or incentives to new flexibility sources or to new generation and storage technologies, could be required. This paper looks at the possible evolution of the Portuguese power system focusing on the net demand ramp problem. The historical and expected evolution of the hourly ramps of the net demand are analyzed considering different scenarios of high wind and solar PV penetration, according to different degrees of convergence to the EU energy strategic objectives.

Abstract

Abstract
Mobility redefinition is essential in any City/Region, towards attaining sustainable mobility in terms of the triple bottom line dimensions (economic, social and environmental). Therefore, it is urgent to improve and to create a more inclusive system towards enhancing public transport, based on population needs and using viable infrastructures and alternatives. Aiming to identify recent keys mobility systems, this paper presents an overview of various solutions adopted in public transports area, in some regions of the world with points in common with Alto Minho' Region and/or to the Region headquarters (Viana do Castelo). Furthermore, it is intended to identify and discuss those innovative combinations of transport modes currently employed, that could positively impact the Alto Minho Region transportation system. The overall assessment will support the definition of the main criteria to design a novel and efficient transport system, fully adapted to this region characteristics and population's needs. Thus, the purpose of this paper is to propose a viable and efficient public transport system that meets the region's sustainability requirements, along with the opportunity to involve the population, the transport companies and the different stakeholders, as well as the policy makers.

Abstract
The optical immersion clearing is an effective method to reduce light scattering in tissues, but to optimize each treatment, it is necessary to understand the mechanisms involved. Since these treatments are intended to be temporary, it is also important to know if the mechanisms involved are reversible. Various studies have been made to evaluate and characterize the mechanisms of optical clearing. In all cases studied, two major mechanisms were observed—the tissue dehydration and the refractive index matching mechanisms. Some particular studies have reported that the agents used in treatments also dissolve proteins and suggested that protein dissolution is also a clearing mechanism. All these mechanisms have been reported as reversible, both on ex vivo or on in vivo studies. We make an analysis on these studies and present a method based on ex vivo collimated transmittance and thickness measurements to characterize the major clearing mechanisms—tissue dehydration and refractive index matching. Although this method can only be made with ex vivo tissues, alternative measurements are suggested for in vivo characterization of the clearing mechanisms. © 2019, The Author(s), under exclusive license to Springer Nature Switzerland AG.

Abstract
E-learning at the University of Tras-os-Montes e Alto Douro (UTAD) is at a very early stage, with the total number of courses available being very low. This is due to the lack of teacher training, lack of technical support, lack of specific tools and lack of institutional support policies, among others. An exception to this is the existence of a platform for teaching support, named SIDE - side.utad.pt, developed at UTAD and which has been systematically used over the last decade. However, SIDE works more like a teaching management platform (e.g. student management, assessment schedules management, attendance management, schedules management, etc.) rather than as a platform for dissemination and management of online content and courses. Recently, we have elsewhere presented a model of a system that is capable of responding to the training needs identified at UTAD, and we have been using it at UTAD. Here, we present the perspectives of the students, using a survey with 23 questions based on a Likert scale, with a 5 points interval, with 1 being the lowest value (or dissatisfaction) and 5 being the maximum (or excellence) value, being the intermediate point considered satisfaction. The questions were grouped in 5 classes: platform, teaching, tests/exams, devices/hardware and global appreciation. The 78 validated answers and their results will be presented and discussed. For the first class, platform, it was concluded that most of the students consider the platform easy to use and that it adapts to the contents that are taught in the various curricular units of the different degrees of study, and that they feel comfortable using and working with the platform and that they recommended higher use by their teachers.