990 resultados para growing media
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The flow of Bingham liquids through porous media has been studied. Experiments have been performed to determine the flow rate / pressure drop relationship for the flow of a grease of Binghamian rheological behavior through an array of rods of circular cross section. The yield stress and plastic viscosity of the grease have been determined with the aid of a controlled stress rotational rheometer. To investigate a wider range of the flow parameters, the mass and momentum conservation equations have been solved numerically, in conjunction with the generalized Newtonian constitutive law and the bi-viscosity model. The finite volume method has been employed to obtain the numerical solution. These numerical results also yielded a flow rate / pressure drop relationship, which is in very good agreement with the experimental results. A capillaric theory has been developed to determine an analytical relationship between the flow rate and pressure drop for flows of Bingham liquids through porous media. It is shown that the predictions of this theory are in good agreement with the experimental and numerical results.
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Arja Tuuliniemen esitys Asiantuntijaseminaarissa Helsingissä 13.2.2014.
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Social media has become a part of many people’s everyday lives. In the library field the adoption of social media has been widespread and discussions of the development of “Library 2.0” began at an early stage. The aim with this thesis is to study the interface between public libraries, social media, and users, focusing on information activities. The main research question is: How is the interface between public libraries and social media perceived and acted upon by its main stakeholders (library professionals and users)? The background of Library 2.0 is strongly associated with the development of the Web and social media, as well as with the public libraries and their user-centered and information technological development. The theoretical framework builds on the research within the area of Library and Information Science concerning information behavior, information practice, and information activities. Earlier research on social media and public libraries is also highlighted in this thesis. The methods survey and content analysis were applied to map the interface between social media and public libraries. A questionnaire was handed out to the users and another questionnaire was sent out to the library professionals. The results were statistically analyzed. In the content analysis public library Facebook pages were studied. All the empirical investigations were conducted in the area of Finland Proper. An integrated analysis of the results deepens the understanding of the key elements of the social media and public library context. These elements are interactivity, information activities, perceptions, and stakeholders. In this context seven information activities were distinguished: reading, seeking, creating, communicating, informing, mediating, and contributing. This thesis contributes to develop the research concerning information activities and draws a realistic picture of the challenges and opportunities in the social media and public library context. It also contributes with knowledge on library professionals and library users, and the existing differences in their perceptions of the interface between libraries and social media.
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Long-term independent budget travel to countries far away has become increasingly common over the last few decades, and backpacking has now entered the tourism mainstream. Nowadays, backpackers are a very important segment of the global travel market. Backpacking is a type of tourism that involves a lot of information search activities. The Internet has become a major source of information as well as a platform for tourism business transactions. It allows travelers to gain information very effortlessly and to learn about tourist destinations and products directly from other travelers in the form of electronic word-of-mouth (eWOM). Social media has penetrated and changed the backpacker market, as now modern travelers can stay connected to people at home, read online recommendations, and organize and book their trips very independently. In order to create a wider understanding on modern-day backpackers and their information search and share behavior in the Web 2.0 era, this thesis examined contemporary backpackers and their use of social media as an information and communication platform. In order to achieve this goal, three sub-objectives were identified: 1. to describe contemporary backpacker tourism 2. to examine contemporary backpackers’ travel information search and share behavior 3. to explore the impacts of new information and communications technologies and Web 2.0 on backpacker tourism The empirical data was gathered with an online survey, thus the method of analysis was mainly quantitative, and a qualitative method was used for a brief analysis of open questions. The research included both descriptive and analytical approaches, as the goal was to describe modern-day backpackers, and to examine possible interdependencies between information search and share behavior and background variables. The interdependencies were tested for statistical significance with the help of five research hypotheses. The results suggested that backpackers no longer fall under the original backpacker definitions described some decades ago. Now, they are mainly short-term travelers, whose trips resemble more those of mainstream tourists. They use communication technologies very actively, and particularly social media. Traditional information sources, mainly guide books and recommendations from friends, are of great importance to them but also eWOM sources are widely used in travel decision making. The use of each source varies according to the stage of the trip. All in all, Web 2.0 and new ICTs have transformed the backpacker tourism industry in many ways. Although the experience has become less authentic in some travelers’ eyes, the backpacker culture is still recognizable.
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Työhyvinvointi työpaikoilla on Työterveyslaitoksen vuonna 2008 tekemän tutkimuksen mukaan heikentynyt ja tästä kertyvät kustannukset yhteiskunnalle ovat 24 miljardin euron vuodessa. Yritykset ovat pyrkineet vastaamaan tähän haasteeseen muun muassa jaetun johtajuuden keinoin ja panostamalla työntekijöiden työhyvinvointiin. Koska tästä työhyvinvoinnin laskusta koituvat kustannukset heikentävät yritysten kannattavuutta, on tätä asiaa syytä tutkia tarkemmin. Tämän tutkimuksen tarkoituksena on selvittää jaetun johtajuuden ja työhyvinvoinnin välistä yhteyttä pelialan ja TV-tuotantoyrityksissä. Lisäksi pyritään löytämään uusia työhyvinvointia ja jaettua johtajuutta linkittäviä tekijöitä. Tutkimus tehtiin laadullisena tutkimuksena haastattelemalla pelialalla ja TV-tuotantoyrityksissä työskenteleviä ihmisiä, heidän kokemuksiaan työhyvinvoinnista ja jaetusta johtajuudesta. Aiemmista työhyvinvoinnin tutkimuksista nostettiin esille neljä tutkijaa, joiden johtopäätökset olivat ydinviestiltään hyvin yhteneväisiä. Jaetun johtajuuden merkitys aiemman tutkimuksen valossa tiivistyi yksilön huomioonottamiseen ja hänen vahvuuksiensa hyödyntämiseen. Verrattaessa työhyvinvoinnin ja jaetun johtajuuden tutkimusten tuloksia, havaittiin niillä olevan useita yhteisiä tekijöitä. Haastatteluaineistoa lähestyttiin analyysissä induktiivisesti grounded teorian pohjalta koodaamalla ja luokittelemalla haastatteluaineistoa yläkategorioiksi, tiettyä asiakokonaisuutta koskeviksi kuvauksiksi. Näiden yläkategorioiden välisistä sidoksista muodostetusta käsitekartasta etsittiin selittäviä sidoksia jaetun johtajuuden ja työhyvinvoinnin välisille yhteyksille. Merkittävimpinä yläkategorioina käsitekartasta olivat liiketoiminta, motivaatio ja ihmissuhteet. Näissä kiteytyvät jaetun johtajuuden ja työhyvinvoinnin välisen yhteyden ydinsanoma; menestyvä liiketoiminta tarvitsee motivoituneen henkilöstön, jonka ihmissuhteet ovat hyvässä kunnossa. Uutena tekijänä tutkimuksessa löydettiin organisaation sisäisen ja ulkoisen vapauden positiivinen vaikutus jaetulle johtajuudelle ja työhyvinvoinnille. Johtopäätöksenä tutkimuksesta saatiin johtamisen ja työhyvinvoinnin positiivinen sykli, jossa sosiaalisessa prosessissa yrityksen työntekijöiden luomat arvot ohjaavat niitä tavoitteita, joihin yritys pyrkii. Tämä motivoi työntekijöitä toteuttamaan näitä tavoitteita sekä kehittämään itseään ja ihmissuhteitaan. Työntekijöiden osallistuminen sosiaaliseen prosessiin sitoutuneisuutta heitä yrityksen liiketoimintaprosessiin. Liiketoimintaprosessista saatava palaute muokkaa edelleen yrityksen arvoja ja näin sykli käynnistyy uudelleen. Vapaus oli haastatelluissa yrityksissä tyypillinen uusi välittävä tekijä jaetun johtajuuden ja työhyvinvoinnin välillä.
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Social media is very current topic in today’s society and organisations. In the times of economic challenges, companies are looking for efficient ways to resource workforce. In addition, there is competition of competent workforce in employment markets. Employer image plays important role in recruitment as people seek to organisations they find interesting and have a reputation as a good employer. This study concerns the discussion on utilising social media in recruitment and employer image in a corporate enterprise. I will find solutions how to utilize social media in recruitment, in which channels and methods that can be done and what these actions require from a company doing social recruitment. I bring up the discussion and challenges that relate to starting to take social media into use in an organization overall and in recruitment. The qualitative material has been gathered with interviews of eighteen persons and the material available about the topic in the enterprise intranet. According to the study, social media is seen both as an opportunity to reach large amount of people quickly and cost-efficiently, but then again it brings news aspects for controlling the employer image and communication towards the audience. Taking social media into use as part of recruiters and managers daily work requires both finding the right channels and attention to the internal communication culture and resourcing. Social recruitment requires a strategy and a proper plan to be able to work in a company. There are several social media channels that enable to reach people, but they don’t do the social recruitment alone.
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Biosynthesis and subsequent release of allelochemicals by a plant into the environment is supposed to be influenced by its growing conditions. To ascertain what will be the allelopathic action of plant parts and rhizospheric soils of parthenium (Parthenium hysterophorus) growing at various farm locations with varied growing conditions, germination and seedling growth of maize hybrid (DK 6142) were assayed by sowing its seeds in petri plates lined with filter paper and pots filled with soil. Minimum germination percentage (30.0%), germination index (2.01), germination energy (36.3), seedling length (3.3 cm), seedling biomass (10 mg) and seedling vigor index (99.0) of maize were observed in leaf extract followed by fruit and whole plant extracts of parthenium growing near the field border. Rhizospheric soil collected underneath parthenium growing near a water channel caused maximum reductions in germination index (30.8%), germination energy (40.6%), seedling length (32.6%), seedling biomass (35.1%) and seedling vigor index (34.3%) of maize compared with that soil without any vegetation. Phytotoxic inhibitory effects of both parthenium plant and rhizospheric soil were more pronounced on maize root than its shoot growth. The higher suppressive action against germination and seedling growth of maize was probably due to higher total phenolic concentrations (6678.2 and 2549.0 mg L-1) and presence of phenolic compounds viz., gallic, caffeic, 4-hydroxy-3-methoxy benzoic, p-coumaric and m-coumaric acids; and ferulic, vanillic, syringic and m-coumaric acids in aqueous leaf extract of parthenium uprooted near the field border and its rhizospheric soil collected near a water channel, respectively.
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Presentation at Open Repositories 2014, Helsinki, Finland, June 9-13, 2014
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Poster at Open Repositories 2014, Helsinki, Finland, June 9-13, 2014
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Presentation at Open Repositories 2014, Helsinki, Finland, June 9-13, 2014
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T. absinthioides, Inuleae, Compositae, is a weedy species that is spreading in the irrigation area of the Colorado River, Argentina. This species can be found in normal and saline soils. Morphological and anatomical variables were measured with two salts, sodium chloride and sodium sulfate, with three levels of osmotic potential -0.4, -0.8 and -1.5 MPa, in hydroponic culture, using Hoagland solution as the cultivation media. The total diameter of the roots of plants growing in Na2SO4 and NaCl increased when the osmotic potential was -0.4 MPa. In plants growing in NaCl this may have resulted from the increase in the size of the cortical cells and in plants growing in Na2SO4, the diameter increased may be due to an increase in the cambial activity. The number and length of shoot internodes decreased with increasing salinity, even though this was not statistically significant. In comparison to the control, the total diameter of the shoot increased at -0.4 MPa and decreased with the reduction of the osmotic potential. In comparison to the control, the length of the leaves decreased at -0.4 MPa and the leaves width increased at the same concentration. The palisade parenchyma appeared less developed in saline conditions. In comparison to the control, the number of hairs increased at -0.4 MPa. T. absinthioides acts as a semihalophytic species, according to the salt ranks it tolerates. The mechanisms of adaptation to saline conditions are succulence in root and stunted growth if the salt in the media is NaCl, and the production of haloxeromorphic characters if the salt in the media is Na2 SO4