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In this paper, heat and mass balances of the intercooler in a 100 kW Proton Exchange Membrane Fuel Cell (PEMFC) system are analyzed by employing a commercial software IPSEpro. The compressor, ambient temperature, the humidification method and the PEMFCs cathode operating temperature were considered as the parameters influencing the heat and mass balances in the intercooler. Parametric studies of t
A fully integrated differential class-AB power amplifier has been designed in a 0.25 um CMOS technology. It is intended for medium output power ranges such as Bluetooth class 1, and has an operating frequency of 2.45 GHz. By using two parallel output stages that can be switched on or off, a high efficiency can be achieved for both high and low output power levels. The simulated maximum output powe
Utilization of an ethanol driven, combustion-based power generator promises high-efficiency combustion in diesel-like engines and avoids problems connected to shrinking supplies of fossil fuels since fuels like ethanol or dimethyl ether can be produced from renewable resources. Fuel injection into such generator through a piezoelectric micro mass flow controller (MMFC) features low power consumpti
Candelaria pacifica is formally described. It is currently known from North and South America and Europe. The species is characterized by a small, lobate thallus with soredia formed on the lobe tips and along the margins. It has been confused with C. concolor in Europe and North America, but differs in having 8-spored asci and in lacking a lower cortex. Candelaria vulgaris, the type species of the
Eutrophication and persistent pollutants are two of the main environmental problems in European marine and freshwater ecosystems. As they tend to co-occur, interactive processes between eutrophication and contaminants are suggested, that may lead to environmental effects that cannot be predicted from each process alone. In order to predict the consequences of remedial measures (changing the input
In this paper error bounds for truncated balanced linear time-varying systems in discrete time are obtained. The analysis is based on direct calculations with the time-varying observability and controllability Lyapunov inequalities. The obtained bounds in the induced l-script -norm generalize well-known error-bound formulas for time-invariant systems. The case of time-varying state-space dimension
The problem of adversarial CNN attacks is considered, with an emphasis on attacks that are trivial to perform but difficult to defend. A framework for the study of such attacks is proposed, using real world object manipulations. Unlike most works in the past, this framework supports the design of attacks based on both small and large image perturbations, implemented by camera shake and pose variat
A method is presented that combines advanced experimental and numerical techniques in the determination of constitutive parameters. The general principle is that a specimen, producing a non-homogeneous stress state, is deformed rapidly. Load and deformation is recorded during the deformation and the event is also simulated using FEM. For the numerical calculation a set of constitutive parameters i
In a world where the challenges of climate change, social inequality, economic instability, and geopolitical tensions are ever-present, educators have a unique opportunity—and responsibility—to prepare their students to navigate these complexities. However, educators are also juggling teaching and research, competing deadlines, shifting expectations, institutional paradigms, and limited time and s
We consider thermal fluid structure interaction to model industrial gas quenching in steel forging, where hot steel Is cooled using cold high pressured gas. This allows to define properties of the finished steel part, as for example yield strength, locally at low cost and without environmental problems. For the numerical simulation, a partitioned approach via a Dirichlet-Neumann coupling and a fix
In this perspective article, we provide recommendations for strengthening the policy framework for protecting the Baltic Sea from agricultural nutrient pollution. The most striking weakness is the lax implementation of prescribed abatement measures, particularly concerning manure management, in most countries. Institutions of the EU should also be leveraged for achieving Baltic Sea Action Plan (BS
Swedish institutions of higher education must promote widening participation. This goal is also expressed in policy documents at Lund University. To accomplish this, teachers at Lund University formed a group to strategically work towards student inclusion. This article reports on an interview study conducted by this group investigating students’ experiences and perceptions of entering education a
Structural Health Monitoring (SHM) provides real-time information about structural damage and its evolution over time, which supports decision-makers in managing structural integrity. However, traditional SHM systems, such as vibration-based systems with accelerometers, require laborious installation and maintenance of instrumentation, including sensors, cables, and acquisition systems directly in
The purpose of the presented garbage collector interface is to provide a universal interface for many different implementations of garbage collectors. This is to simplify the integration and exchange of garbage collectors, but also to support incremental, non-conservative, and thread safe implementations. Due to the complexity of the interface, it is aimed at code generators and preprocessors. Exp
I takt med klimatkrisens tilltagande har miljö- och hållbarhetsfrågor fått allt större utrymme inom flera rättsområden. Inom immaterialrätten har ett sådant utrymme dock varit begränsat, något som kommit att ifrågasättas mot bakgrund av den stora mängden intrångsgörande produkter som förstörs till följd av den utbredda förfalskningsproblematiken. När en produkt fastställs som intrångsgörande kan rAs the climate crisis has intensified, environmental and sustainability concerns have gained traction across several areas of law. Within intellectual property law, however, such considerations have traditionally played a limited role, a circumstance that has increasingly been questioned in light of the substantial volume of infringing goods destroyed as a result of widespread counterfeiting. When
Det svenska nämndemannasystemet har en nästan tusenårig tradition, men har samtidigt varit ett institut i ständig förändring, vars roll förändrats väsentligt från när det först infördes i Sveriges rättskipning, till dagens moderna system. I början fungerade nämnden endast som en form av bevismedel, men fick sedan en ren domarroll för att senare reduceras till en rådgivande funktion. Efter att nämnThe Swedish lay judge system is a nearly thousand year old tradition, but has during that time been an institution in constant change, whose role has changed significantly from when it was first introduced into Sweden’s administration of justice until today’s modern system. The lay judges were originally used as a means of proof, thereafter functioned as ordinary judges, to later be reduced to adv
