Optimal charging of electric drive vehicles in a market environment

With a potential to facilitate the integration of renewable energy into the electricity system, electric drive vehicles may offer a considerable flexibility by allowing for charging and discharging when desired. This paper takes the perspective of an aggregator that manages the electricity market participation of a vehicle fleet and presents a framework for optimizing charging and discharging of the electric drive vehicles, given the driving patterns of the fleet and the variations in market prices of electricity. When the aggregator is a price-taker the optimization can be stated in terms of linear programming whereas a quadratic programming formulation is required when he/she has market power. A Danish case study illustrates the construction of representative driving patterns through clustering of survey data from Western Denmark and the prediction of electricity price variations through regression on prices from the Nordic market. The results show that electric vehicles provide flexibility almost exclusively through charging. Moreover, the vehicles provide flexibility within the day but only limited flexibility from day to day when driving patterns are fixed.     

Gender identity and coping in female 46, XY adults with androgen biosynthesis deficiency (intersexuality/DSD).

Individuals living with an intersex condition have not received much attention in counseling psychology, although a high need for psychosocial care is obvious. Using a mixed-methods multiple case study with qualitative and quantitative data, the authors explore coping and gender experiences in seven 46, XY intersexual persons with deficiencies of androgen biosynthesis. These were assigned female at birth. At puberty, the participants experienced unexpected physical virilization due to 5alpha-reductase-2 (n = 3) and 17beta-hydroxysteroid dehydrogenase-3 deficiency (n = 4). All 7 received medical treatment (e.g., gonadal removal, genital surgery) to stop virilization and maintain the primarily assigned female sex and gender. The cases illustrate high adjustment challenges caused by the condition itself and the medical treatment experienced. None changed to male during adolescence as reported in previous studies. Highly variable patterns of gender identification become visible with subjectivities that do not only represent a binary gender model. Adult gender identity outcome of the participants is characterized by an increased uncertainty of gender identity, high male and low female gender identity. Implications for clinical management, particularly psychological counseling, are drawn. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Wind power and market power in competitive markets

Average market prices for intermittent generation technologies are lower than for conventional generation. This has a technical reason but can be exaggerated in the presence of market power. When there is much wind smaller amounts of conventional generation technologies are required, and prices are lower, while at times of little wind prices are higher. This effect reflects the value of different generation technologies to the system. But under conditions of market power, conventional generators with market power can further depress the prices if they have to buy back energy at times of large wind output and can increase prices if they have to sell additional power at times of little wind output. This greatly exaggerates the effect. Forward contracting does not reduce the effect. An important consequence is that allowing market power profit margins as a support mechanism for generation capacity investment is not a technologically neutral policy.     

Zur Ermittlung des Energiebedarfs für Kunstlicht in Bürogebäuden – Diskussion von Meßresultaten

On determination of the electric lighting energy demand of non‐domestic buildings – discussion of measuring results Within the framework of a support programme “Energy Optimized Building” research und demonstration activities of energy‐saving non‐domestic buildings are supported since 1995. Amongst other publications two articles in this journa and a recently published book describe details on the support programme, the buildings and results. This paper deals with the evaluation of the use of daylight and electric lighting. Besides a comparison and results of the projects it focuses on the question how close to reality existing simulation or calculation tools predict the annual electric lighting energy demand.     

Erweiterte Qualitätsprüfungen zum Nachweis ausreichender Betondeckung von bewehrten Bohrpfählen

Extended quality checks for proof of sufficient concrete cover in reinforced concrete bored piles. For the “Unterföhring Tunnel” BAUER Spezialtiefbau GmbH, worldwide acting in special foundation construction projects, carried out bored pile walls using their recent technology of the double rotary drive system. The supervising building authority carried out control measurements, which showed that apparently the concrete cover was in accordance neither with the contract requirements nor with the German Standard. Therefore very thorough quality checks were conducted on a very large scale which resulted in an expert statement which certified full bearing capacity and full serviceability of the tunnel frame for the required service life of 100 years – without any restrictions. Therefore no repairs were necessary at all. The double rotary drive system allows drilling a bore hole while retaining it with a steel casing in one production process. While the drilling auger filled with soil is being extracted, concrete is being pumped in through the core of the auger. This means that the reinforcement cage has to be installed into the fresh pile concrete afterwards. The newly acquired knowledge made BAUER improve the double rotary drive system as to device and procedure, thus ensuring state‐of‐the‐art bored piles for the future, even under demanding conditions as in Unterföhring.     

Influence of inoculation levels and processing parameters on the survival of Campylobacter jejuni in German style fermented turkey sausages

This study investigated the influence of inoculum levels and manufacturing methods on the survival of Campylobacter (C.) jejuni in raw fermented turkey sausages. Sausages were prepared and inoculated with C. jejuni. After inoculation, these sausages were processed and ripened for 8 days. Samples were taken throughout the ripening process. The presence of C. jejuni was established bacteriologically. Additionally, lactic acid bacteria were enumerated, pH values and water activity were measured to verify the ripening process. To detect changes in genotype and verify the identity of the recovered clones, AFLP analysis was carried out on the re-isolated strains. Whereas no C. jejuni were detectable when inoculating the sausages with the lowest inoculum (0.08-0.44 log(10) cfu/g sausage emulsion), C. jejuni were detectable for 12-24h by enrichment when inoculated with approximately 2 log(10) cfu/g. After inoculation with 4 and 6 log(10) cfu/g respectively, C. jejuni were detectable without enrichment for 12-48 h and by enrichment for 144 h at the most. The greatest decrease of the C. jejuni population occurred during the first 4 h of ripening. Only a very high inoculum level allowed the survival of the organism during a fermentation process and during ripening to pose a potential risk for consumers. Lower initial Campylobacter inoculums will be eliminated during proper ripening of the sausages, if sufficient decrease in water activity and pH-value is ensured.     

Polypropylene composites with enzyme modified abaca fibre

Abaca fibre reinforced PP composites were prepared using a high speed mixer followed by injection moulding with 30 wt.% of fibre load. Prior to composite production, the fibres were modified by fungamix and natural enzyme. The effects of modification of the fibre were assessed on the basis of morphology and thermal resistance and as well as on mechanical, thermal and environmental stress corrosion resistance properties of the resulting composites. Coupling agent (MA-PP) was also used with unmodified abaca fibre to observe the coupling agent effect on resulting composites properties. The moisture absorption of the composites was found to be reduced 20–45% due to modification. Tensile strength found to be 5–45% and flexural strengths found to be 10–35% increased due to modification. Modified fibre composites found to better resistance in acid and base medium.     

Silver Nanoparticles with Controlled Dispersity and Their Assembly into Superstructures

In this paper we report on the influence of particle size distribution, particle substrate interaction, and drying behavior on the self‐assembly process using ligand stabilized silver particles. Two‐dimensional particle arrays were characterized using transmission electron microscopy and extensive image analysis. The formation of such structures was observed in situ using an environmental scanning electron microscope in WET‐STEM mode. The results confirm that a small particle size distribution is crucial for the formation of regular particle patterns with long range order, but also the particle substrate interaction and the particle density have an influence on the degree of ordering. Additionally, we find that separated binary particle assemblies keep the orientation of their two‐dimensional hexagonal lattices over alternating domains of small and big particles. This is probably enabled due to the formation of dislocations and a small change of the course of the lattice lines within the respective boundary.