Friendly amendment: a commentary on Doyle and Ford's proposed re-definition of 'mental model'

Some amendments are proposed to a recent redefinition of the mental model concept in system dynamics. First, externalised, or articulated mental models should not be called cognitive maps; this term has a well established, alternative meaning. Second, there can be mental models of entities not yet existing beyond an individual's mind; the modelling of planned or desired systems is possible and recommended. Third, saying that mental models maintain social systems connects with some exciting research opportunities for system dynamics; however, it is probably an accidental distraction from the intended meaning of the redefinition. These minor criticisms apart, the new definition of mental model of a dynamic system is welcomed as a useful contribution to both research and practice.

On the poorly known genus Anuvinda Lehtinen, 1967 (Araneae: Titanoecidae)

The spider genus Anuvinda includes a single species described from India, Anuvinda escheri (Reimoser), based on a female. The male remained unknown and no other specimens beyond the type specimen are known. In this paper we present the first description of the male of A. escheri and the redescription of the female, based on material recently collected in China, Laos and Thailand. In addition, the distribution range of the species is extended to include these three countries.

Frihetsbegreppets utveckling i Folkpartiets program 1967-1997

Denna uppsats studerar utvecklingen av begreppet frihet i Folkpartiets partiprogram mellan 1967-1997. Undersökningen tar hänsyn till partiprogram och program om näringslivspolitik samt utbildningspolitik. Det olika sammanhang som frihet presenteras i relateras till tre typer av frihet och idealtyper om socialliberal och nyliberal frihet.Förändringen av synen på frihet går till en viss del från en frihetssyn där alla skall ha möjlig¬het att förverkliga sin egen potential till en frihetssyn där Folkpartiet anser att individerna skall få spendera sina egna resurser efter eget huvud. Trenden är en övergång från en socialliberal politik till en nyliberal politik. De tendenser där detta blir tydligast är i synen på friskolorna och åsikterna om hur befolkningen bör bli beskattade och vilket syfte som beskattningen har. Igenom hela perioden håller Folkpartiet vissa värden konstanta. Folkpartiet förespråkar in¬dividens rätt mot olika organisationer och att marknadsekonomi är önskvärd men inte perfekt.

Solar Energy assessment based on weather station data for direct site monitoring in Indonesia

This thesis evaluates different sites for a weather measurement system and a suitable PV- simulation for University of Surabaya (UBAYA) in Indonesia/Java. The weather station is able to monitor all common weather phenomena including solar insolation. It is planned to use the data for scientific and educational purposes in the renewable energy studies. During evaluation and installation it falls into place that official specifications from global meteorological organizations could not be meet for some sensors caused by the conditions of UBAYA campus. After arranging the hardware the weather at the site was monitored for period of time. A comparison with different official sources from ground based and satellite bases measurements showed differences in wind and solar radiation. In some cases the monthly average solar insolation was deviating 42 % for satellite-based measurements. For the ground based it was less than 10 %. The average wind speed has a difference of 33 % compared to a source, which evaluated the wind power in Surabaya. The wind direction shows instabilities towards east compared with data from local weather station at the airport. PSET has the chance to get some investments to investigate photovoltaic on there own roof. With several simulations a suitable roof direction and the yearly and monthly outputs are shown. With a 7.7 kWpeak PV installation with the latest crystalline technology on the market 8.82 MWh/year could be achieved with weather data from 2012. Thin film technology could increase the value up to 9.13 MWh/year. However, the roofs have enough area to install PV. Finally the low price of electricity in Indonesia makes it not worth to feed in the energy into the public grid.