264 research outputs found

    The influence of regional geological settings on the seismic hazard level in copper mines in the Legnica-Głogów Copper Belt Area (Poland)

    Full text link
    The current level of rockburst hazard in copper mines of the (LGOM) Legnica- Głogów Copper Belt Area is mostly the consequence of mining-induced seismicity, whilst the majority of rockbursting events registered to date were caused by high-energy tremors. The analysis of seismic readings in recent years reveals that the highest seismic activity among the copper mines in the LGOM is registered in the mine Rudna. This study investigates the seismic activity in the rock strata in the Rudna mine fields over the years 2006-2015. Of particular interest are the key seismicity parameters: the number of registered seismic events, the total energy emissions, the energy index. It appears that varied seismic activity in the area may be the function of several variables: effective mining thickness, the thickness of burst-prone strata and tectonic intensity. The results support and corroborate the view that principal factors influencing the actual seismic hazard level are regional geological conditions in the copper mines within the Legnica-Głogów Copper Belt Area

    The impact of the structural features of the rock mass on seismicity in Polish coal mines

    Full text link
    The article presents seismic activity induced in the coal mines of the Upper Silesian Coal Basin (GZW) in relation to the locations of the occurrence of rockbursts. The comparison of these measurements with the structural features of the rock mass of coal mines indicates the possibility of estimating the so-called Unitary Energy Expenditure (UEE) in a specific time. The obtained values of UEE were compared with the distribution of seismic activity in GZW mines. The level of seismic activity in the analysed period changed and depended on the intensity of mining works and diverse mining and geological conditions. Five regions, where tremors occurred (Bytom Trough, Main Saddle, Main Trough, Kazimierz Trough, and Jejkowice and Chwałowice Trough) which belong to various structural units of the Upper Silesia were analyzed. It was found out that rock bursts were recorded only in three regions: Main Saddle, Bytom Trough, and Jejkowice and Chwałowice Trough

    The effect of image fractal properties and its interaction with visual discomfort on gait kinematics

    Full text link
    Exposure to images of urban environments affords higher cognitive processing demands than exposure to images of nature scenes; an effect potentially related to differences in low-level image statistics such as fractals. The aim of the current study was to investigate whether the fractal dimensions of an abstract scene affect cognitive processing demands, using gait kinematics as a measure of cognitive demand. Participants (n = 40) were asked to walk towards different types of synthetic images which were parametrically varied in their fractal dimensions. At the end of each walk, participants rated each image for its visual discomfort (n = 20) or for its likability (n = 20) as potential confounding factors. Fractal dimensions were predictors of walking speed. Moreover, the interaction between fractal dimensions and subjective visual discomfort but not liking predicted velocity. Overall, these data suggest that fractal dimensions indeed contribute to environmentally induced cognitive processing demands

    Nature benefits revisited:Differences in gait kinematics between nature and urban images disappear when image types are controlled for likeability

    Get PDF
    Exposure to urban environments requires more cognitive processing than exposure to nature; an effect that can even be measured analysing gait kinematics whilst people walk towards photographic images. Here, we investigated whether differences in cognitive load between nature and urban scenes are still present when scenes are matched for their liking scores. Participants were exposed to images of nature and urban scenes that had been matched a priori for their liking scores by an independent participant sample (n = 300). Participants (N = 44) were either asked to memorise each image during walking or to rate each image for its visual discomfort after each walk. Irrespective of experimental task, liking score but not environment type predicted gait velocity. Moreover, subjective visual discomfort was predictive of gait velocity. The positive impact of nature described in the literature thus might, at least in part, be due to people's aesthetic preferences for nature images.</p

    THE NEED FOR CHALKING AND CHEMICAL FERTILIZERS APPLICATION ON THE ALBOTA ALBIC LUVISOL

    Get PDF
    A field experiment was carried out at SCDA Pitești, on an Albic Luvisol with a 25.0-25.2% clay content, with soy crop, Raluca TD variety. Seeds were treated with Bradyrhizobiumjaponicum, the density was 45-50 germinable grains/m2, and the distance between rows 50 cm. Fertilizers were applied during the vegetation cycle as follows: Dual 1 liter/ha, Décor 0,5 liters/ha, and Pulsar 1 liter/ha. The experimental design included 12 variants with the following chemical fertilizers doses: N0P0, N40P40, and N80P80. Agrocalcium (a product obtained by lime fine grinding, with a minimum 90% calcium carbonate content) and Doloflor (100% BIO fertilizer based on bitter spar with a minimum 50% calcium and magnesium oxide content) were used as chalking. Doloflor application as powder and granules in a 2.5 t/ha dose without N and P fertilization modified the soil reaction and pH registered values of 5.3-5.5, in the moderately acid reaction domain. Doloflor powder and granules in 2.5 t/ha dose together with N40P40 and N80P80 fertilizers doses determined very high mobile phosphorus content values (95-97 mg/kg). Mobile potassium contents in the analyzed variants are low ((100-125 mg/kg). Grain yield ranged from 1,483 to 2,053 kg/ha. The lowest yield resulted in the unfertilized and unlimed control. The highest values of grain yield were obtained when applying liming doses together with complex fertilizers

    Private investments in Diyarbakır before and after the 2012 incentive law

    Get PDF
    İster gelişmiş, isterse de gelişmekte olan statüsündeki tüm ülkeler, mukayeseli üstünlükleritemelinde büyüme potansiyellerini realize etmek/ performanslarını yükseltebilmekiçin iktisat bilimi dâhilinde teorik ve pratik yönlerden arayış içerisindedir. Buminvalde teşvikler, tüm ülkelerce başvurulan en yaygın iktisat politikası aracıdır. Türkiye’debu alandaki en kapsamlı sistem, 2012 yılında hayata geçirilmiştir. Bu çalışmada,2012’de yürürlüğe giren yeni teşvik yasası öncesi ve sonrasında Diyarbakır’ayapılan yatırımlar istatistiksel açıdan analiz edilmiştir. Analizde, birbirini izleyen gözlemdeğerlerinde zamana göre bağımlılığın söz konusu olduğu ve geleceğe dönük tahminleryapmanın en etkili yöntemleri arasında yer alan zaman serileri ile seriye uyumsağlayacak bir fonksiyon oluşturulup geleceğe dair gözlemlerin tahmin edilebileceğidüşüncesi temel alınmıştır. Bu bağlamda; Diyarbakır’a 2007’den itibaren başvurulanteşvik belgesi sayısının, yapılan yatırımların ve bu yatırımlar sonucunda oluşanistihdamın, önceki dönem gözlem dönemleri kullanılarak gelecek dönem gözlem değerlerinintahmin edilebilmesi için zaman serisi denklemleri oluşturulmuş ve gelecekdönemlerde beklenen belge, istihdam ve yatırım miktarı tahmin edilmiştir.Either in the status of developed or developing, all countries are on a quest both theoretically and practically within the science of economics on behalf of realising their growth potential and enhancing their performance on the basis of their comparative advantages. In this manner, incentives are the most frequently used political tool in this field by all countries. The most comprehensive system about incentives in Turkeycame into operation in 2012. In this study, investments made in Diyarbakır before and after the new incentives resolution in 2012 are analyzed statistically.In the analysis, the idea of the presence of dependence in the sequential observation values as to time and the observations prospective to future can be estimated by forming a function adaptable to time series and time series, which are among the most effective methods for making predictions for future is used as a base. Within this context, time series equations are formed for the purpose of estimating future term observat,onvalues of the number of the incentive documents number appealed, investments made and employment comp rised as a result of these investments by using the prior term observation values since 2007 and the number of documents, employment and investment amount expected are estimated
    corecore