• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 63
  • 28
  • 25
  • 13
  • 6
  • 5
  • 3
  • 3
  • 2
  • 2
  • 2
  • 2
  • 2
  • 1
  • 1
  • Tagged with
  • 166
  • 45
  • 25
  • 25
  • 23
  • 20
  • 20
  • 19
  • 19
  • 17
  • 17
  • 16
  • 15
  • 14
  • 13
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
161

Aspens (Aspius aspius) lekvandring och lekhabitat utnyttjande i Glumman.

Olsson, Peter January 2012 (has links)
Aspen är en karpartad fiskart och lite är känt om dess ekologi, på rödlistan har den klassen nära hotad (ArtDatabanken 2012). I värmländska Glumman, en ca två mil lång övergödd å belägen väster om Väse, vandrar aspen upp på våren för att leka vid Väse kyrka där den enda kända lekplatsen i ån finns. Tre vandringshinder finns i ån varav det nedersta är beläget ca 500 m från den kända lekplatsen. Syftet med studien var att undersöka om asp som lyftes över det nedersta vandringshindret sökte sig till lekplatser högre upp i systemet och om de där lekte. Totalt radiomärktes tre asphanar varav två lyftes över det nedersta vandringshindret. Ingen av dem vandrade vidare uppströms för att undersöka möjligheterna till lek. Den asp som släpptes ut nedströms vandringshindret visade inte några tendenser på att vilja passera den kända lekplatsen och fortsätta mot vandringshindret. Leken skedde på det första lekområdet som aspen kommer till i Glumman. När aspen lämnat Glumman uppehöll de sig i sjön Panken. Den första aspen lämnade Panken efter 22 dagar, den andra efter 23 dagar, båda vandrade nedströms mot Vänern. Den tredje aspen var kvar i Panken vid studiens slut. En fiskväg förbi det första vandringshindret i Glumman skulle troligen inte vara det bästa sättet att gynna aspen på för tillfället. / The asp is a threatened cyprinid fish, of which little is known about its ecology (ArtDatabanken 2012). In Glumman, a nearly twenty kilometer long eutrophicated river located west of Väse in Värmland, asp migrate upstream for spawning in the spring to the only known spawning ground, located at Väse church. There are three migration barriers in the river, of which the lowermost is located about 500 m from the spawning ground. The purpose of this study was to investigate whether asp that were lifted over the lowermost migration barrier found their way to spawning grounds higher up in the system and if they spawned there. In total, two of three radio-tagged male asps were lifted above the lowermost migration barrier. None of them migrated further upstream, where they could explore opportunities for spawning. The asp that was placed downstream of the migration barriers did not swim upstream past the known spawning ground and continue to the migration barrier. Spawning occurred at the first spawning ground that the asps reached in Glumman. When the asps left Glumman they went into Lake Panken. The first one left LakePanken after 22 days, the second after 23 days and both migrated downstream towards LakeVänern. The third was still in LakePanken at the end of the study. A fishway at the lowermost migration barrier in Glumman is not likely the best way to help asp at the moment.
162

Výběr informačního systému / Information System Selection

Šebesta, Petr January 2009 (has links)
The thesis deals with problems of enterprise information system selection. Based on theoretical knowledge in the field of information systems and their development is the analysis of enterprise information system selection and situation on czech market. Solution suggestions consist of optimal enterprise information system project description and description of created expert system knowledge base for pre-selection of enterprise information system.
163

半導體晶圓廠投資策略與預測

莊坤榮 Unknown Date (has links)
在全球持續電子化的過程中,台灣一路扮演著落實有效製造與實現設計的推手,無論從主機板、被動元件、面板、晶片設計、晶圓製造以及封裝甚至高精密組裝無所不包,在如此資本密集產業,如何操作才能達到供需平衡,為整體產業經濟創造出良性的競爭平台,避免惡性競爭,就成了不可輕忽的課題。 本文以晶圓產業為探討對象。全球產能平均利用率多年來總維持於中檔 (88%), 且平均銷售單價只能緩降而無強勢反彈,近年企業無不減少資本支出來度過低潮,整合元件製造廠(IDM)相繼喊出工廠資產輕化(fab-lite)的營運策略,這時我們的命題即是:要不要繼續投資?如何調整價值鏈? 本研究中,我們會先檢視目前市場對半導體成長預測的準確度,再經由產業價值活動代表性指標回歸分析法對相關參數做一整合之解析,對晶圓需求量與銷售價建立配適之模型,找出先行指標來達到預測,並定義上下限以供快速比對分析,最後再根據分析結果提出可能之產業趨勢議題。 / This thesis analyzes the semiconductor industry growth worldwide. The leading index via regressions has been established to achieve a reliable forecast on worldwide ASP, wafer demand and revenue. In the long run, we expect the semiconductor demand will continue to grow at CAGR 8% (compound annual growth rate) and display less extreme cycles than past decade. However, revenue’s CAGR might be diluted to around 5%, lower than demand’s growth. Moreover, it might go down to zero-growth for some times since the ASP still slightly trend down before emerging market demand really expanded. Continuous outsourcing is one possible solution for IDM to be fab-lite, since fab’s fix charge is billion- base that needs high utilization to maintain break-even operation. But what is the solution for foundry side to avoid ASP erosion all the way down? Our analysis identifies a need for executive managers to well predict the demand on capital expenditure when making decision.
164

Mobiliųjų paslaugų portalų technologijų tyrimas / Research of mobile portals technologies

Najulis, Mindaugas 03 June 2005 (has links)
Information technologies and mobile telecommunications rapidly enter our personal and social life. Mobile phone is no longer luxury – it has become a necessity. Growing volumes of the mobile services has caused a need to expand the mobile service employment opportunities in the Internet portals. Today’s portals, created using the means, offered by software manufacturers, employ exclusively the mobile Internet service, thanks to which the users can see and manage the necessary information and process of the portal at any time and from anywhere. The problem is related with the fact that mobile Internet services are still expensive in Lithuania. Therefore one should look for cheaper ways to reach and manage portal information. In order to solve this problem one can consider the SMS and MMS message sending, suggested by mobile technologies. Basic aim of the work is to create an entertainment portal, rendering the user both various Internet entertainments (e.g. Internet acquaintances, games), and mobile entertainment (e.g. sending messages, logos, melodies, animations and games for mobile phone) as well as a wide range of mobile services to be used to obtain and to manage the portal information. In the work I describe: portal evolution, classification and creation measures („BroadVision Portal“, „IBM WebSphere Portal for Multiplatforms v5.x“, „Sun One Portal Server v6.0“, „Red Hat Enterprise Portal Server“, „Microsoft SharePoint® Portal Server 2003“, „ORACLE 9ias Portal“, „PHP:... [to full text]
165

Hårdgörning av Asp / Densification of Aspen Wood

Johansson, Martin January 2008 (has links)
Hårdgörning av trä syftar till att göra materialet hårdare. Detta går att åstadkomma genom komprimering, det komprimerade materialet tenderar dock att återgå mot sin ursprungsform då materialet utsätts för fukt om ingen låsning sker. Låsningen kan ske mekaniskt i en treskiktskonstruktion som motverkar träets fuktrörelser. Dessa skivor har dock visat sig vara instabila och tidigare försök har uppvisat deformationer i form av kupning. Denna undersökning syftar till att utreda förutsättningarna för att använda komprimerad asp samt att ta fram underlag för framtagning av en kommersiell produkt. Praktiska tester har genomförts för att studera hårdhet, återfjädring och densitet hos det komprimerade virket. Vidare har treskiktsskivor tagits fram för att testa om det går att få en stabil konstruktion genom att variera tjockleken på spärrskiktet. Även skillnader i acklimatiseringstid och fuktkvotens inverkan för virkets återfjädring har studerats. Resultaten visar på att aspens hårdhet efter komprimering blir i samma nivå som bok och ask, en låg fuktkkvot vid komprimering av materialet ger en låg återfjädring, komprimerat material har en längre acklimatiseringstid till jämviktsfuktkvot och materialet går att låsa tvärs fiberriktningen i en treskiktskonstruktion. / To make wood harder it can be densified. This can be achieved by compression, the compressed material tends to return to the original shape when it is exposed to moisture fluxations and if no form of fixation occurs. The fixation can be done mechanically in a three-layer panel construction which reduce movements in the timber. These panels have been found to be unstable and previous attempts have shown deformations in form of cupping. This study aims to evaluate the conditions for using compressed aspen wood, and to provide a basis for development of a commercial product. Practical tests have been conducted to study hardness, springback and density of the compressed wood. In addition, three-layer panels have been developed to test whether it is possible to have a stable construction by varying the thickness of the buttom layer. Differences in acclimatisation time and the moisture contents effect on the springback has aslo been studied. The results show that the hardness of aspen wood after compression is in equal levels with beech and ashes, a low moisture contet provides a low springback, compressed timber have a longer time for acclimatisation and it is possible to fixate the material in the direction across the grain in a three-layer panel construction.
166

Hårdgörning av Asp / Densification of Aspen Wood

Johansson, Martin January 2008 (has links)
<p>Hårdgörning av trä syftar till att göra materialet hårdare. Detta går att åstadkomma genom komprimering, det komprimerade materialet tenderar dock att återgå mot sin ursprungsform då materialet utsätts för fukt om ingen låsning sker. Låsningen kan ske mekaniskt i en treskiktskonstruktion som motverkar träets fuktrörelser. Dessa skivor har dock visat sig vara instabila och tidigare försök har uppvisat deformationer i form av kupning. Denna undersökning syftar till att utreda förutsättningarna för att använda komprimerad asp samt att ta fram underlag för framtagning av en kommersiell produkt.</p><p>Praktiska tester har genomförts för att studera hårdhet, återfjädring och densitet hos det komprimerade virket. Vidare har treskiktsskivor tagits fram för att testa om det går att få en stabil konstruktion genom att variera tjockleken på spärrskiktet. Även skillnader i acklimatiseringstid och fuktkvotens inverkan för virkets återfjädring har studerats.</p><p>Resultaten visar på att aspens hårdhet efter komprimering blir i samma nivå som bok och ask, en låg fuktkkvot vid komprimering av materialet ger en låg återfjädring, komprimerat material har en längre acklimatiseringstid till jämviktsfuktkvot och materialet går att låsa tvärs fiberriktningen i en treskiktskonstruktion.</p> / <p>To make wood harder it can be densified. This can be achieved by compression, the compressed material tends to return to the original shape when it is exposed to moisture fluxations and if no form of fixation occurs. The fixation can be done mechanically in a three-layer panel construction which reduce movements in the timber. These panels have been found to be unstable and previous attempts have shown deformations in form of cupping. This study aims to evaluate the conditions for using compressed aspen wood, and to provide a basis for development of a commercial product.</p><p>Practical tests have been conducted to study hardness, springback and density of the compressed wood. In addition, three-layer panels have been developed to test whether it is possible to have a stable construction by varying the thickness of the buttom layer. Differences in acclimatisation time and the moisture contents effect on the springback has aslo been studied.</p><p>The results show that the hardness of aspen wood after compression is in equal levels with beech and ashes, a low moisture contet provides a low springback, compressed timber have a longer time for acclimatisation and it is possible to fixate the material in the direction across the grain in a three-layer panel construction.</p>

Page generated in 0.0138 seconds