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  • 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.
51

A macro-tidal freshwater ecosystem recovering from hypereutrophication : the Schelde lease study

Cox, Tom, Maris, Tom, Soetart, Karline, Conley, Daniel, van Damme, Stefan, Meire, Patrick, Middelburg, Jack J., Vos, Matthijs, Struyf, Eric January 2009 (has links)
We report a 40 year record of eutrophication and hypoxia on an estuarine ecosystem and its recovery from hypereutrophication. After decades of high inorganic nutrient concentrations and recurring anoxia and hypoxia, we observe a paradoxical increase in chlorophyll-a concentrations with decreasing nutrient inputs. We hypothesise that algal growth was inhibited due to hypereutrophication, either by elevated ammonium concentrations, severe hypoxia or the production of harmful substances in such a reduced environment. We study the dynamics of a simple but realistic mathematical model, incorporating the assumption of algal growth inhibition. It shows a high algal biomass, net oxygen production equilibrium with low ammonia inputs, and a low algal biomass, net oxygen consumption equilibrium with high ammonia inputs. At intermediate ammonia inputs it displays two alternative stable states. Although not intentional, the numerical output of this model corresponds to observations, giving extra support for assumption of algal growth inhibition. Due to potential algal growth inhibition, the recovery of hypereutrophied systems towards a classical eutrophied state, will need reduction of waste loads below certain thresholds and will be accompanied by large fluctuations in oxygen concentrations. We conclude that also flow-through systems, heavily influenced by external forcings which partly mask internal system dynamics, can display multiple stable states.
52

Distribution Av Pejlbäringar Över IP-nät / Distribution Of Digital Signal through the IP-network

Rani, Iskender January 2004 (has links)
The objective of the thesis is primarily to conform and encode a digital signal to be controlled by software. The idea is to transport today’s tracesignal through the IP-network instead of cable-net. In this report I will suggest a possible solution to get a fully passed result with no peculiar time delay. I will also suggest some ideas for a future work with the new tracesystem.
53

Heterogeneous QEMU-SystemC Integration for Timed CPU/Cache/MMU/DRAM/Component Simulation: A case study in 3D Graphics SoC

Wang, Chun-Hao 15 October 2012 (has links)
Nowadays the designs of HW/SW are extremely complex. HW/SW co-verification is really difficult, consequently the new design layer, Electronic-System Level (ESL), is proposed to replace the original design flow. Today¡¦s ESL can verify the whole system simulation include the Processor, Bus, Memory¡K such as the HWs. It also can run a small program on the system. But it is hard to verify the larger program - such as the operation system because the limitations of the simulation speed. Currently some people proposed the QEMU-SystemC virtual platform. It can greatly speed up the CPU simulation speed. But the abstract simulated CPU has no timing information. It is infeasible to explore the system execution time and performance. We proposed the method: CPU, Cache, TLB and SDRAM with timing model; connect the CPU and the designed HW in TLM bus module in the HW/SW co-simulation. We can analyze the performance in the estimated timing information, and it will not take many simulation times. In addition, we developed the analysis program to show the execution time in each program block. It can help designer to locate the performance bottleneck quickly in the complex HW/SW. A case study is the 3D graphic SoC. We find the performance bottleneck in HW/SW design according the performance information purposed by our work.
54

Neotectonics Of The Karamik Graben-afyon- (isparta Angle), Sw Turkey

Cicek, Aydin 01 July 2009 (has links) (PDF)
ABSTRACT NEOTECTONICS OF THE KARAMIK GRABEN-AFYON-(ISPARTA ANGLE), SW TURKEY &Ccedil / i&ccedil / ek, Aydin M.Sc., Department of Geological Engineering Supervisor: Prof. Dr. Ali Ko&ccedil / yigit July 2009, 98 pages The Karamik Graben (KG) is 6-17-km-wide, 29-km-long and NNE-SSWtrending active depression located within the Isparta Angle of the Southwestern Turkey extensional neotectonic domain. The KG is bounded by ENE-SSWtrending Karaca&ouml / ren fault zone to the south, the NNE-SSW-trending Ko&ccedil / beyli- Akkonak fault zone to the east, the WNW-ESE-trending AkSehir fault zone to the north, and the NE-SW to NNE-SSW-trending Devederesi fault zone to the west. The KG contains two graben infills separated by an angular unconformity: (1) Middle Miocene-Middle Pliocene deformed infill, and (2) the Upper Pliocenerecent non-deformed infill. Some geological structures reveal that the older infill was accumulated under the control of an extensional tectonic regime (phase-I extension). Analysis of NW-SE-trending folds and some strike-slip faults indicate that the older infill deformed by a short-term NE-SW-directed compression. This contractional event is the last record of the paleotectonic period. Some geological and geophysical evidence indicate that the younger infill has been deposited under the control of an extensional tectonic regime (phase-II extension). Analysis of some slickensides implies that the current tectonic regime is being characterized by a multi-directional extension in predominantly N-S, E-W and NW-SE directions. This multi-directional extension dominates the Plio- Quaternary neotectonic period initiated Late Pliocene. Total throw amounts accumulated along the margin boundary faults imply that subsidence rates are ~0.15 mm/yr and ~0.21 mm/yr since Late Pliocene. Some of the northern margin-boundary faults of the KG reactivated during the neotectonic period as evidenced by 2002.02.02 Mw = 6.5 &Ccedil / ay earthquake. However, the rest of these faults are still active and they keep their nature of seismic gap.
55

A High-end Reconfigurable Computation Platform for Particle Physics Experiments

Liu, Ming January 2008 (has links)
<p> </p><p>Modern nuclear and particle physics experiments run at a very high reaction rate and are able to deliver a data rate of up to hundred GBytes/s.  This data rate is far beyond the storage and on-line analysis capability. Fortunately physicists have only interest in a very small proportion among the huge amounts of data. Therefore in order to select the interesting data and reject the background by sophisticated pattern recognition processing, it is essential to realize an efficient data acquisition and trigger system which results in a reduced data rate by several orders of magnitude. Motivated by the requirements from multiple experiment applications, we are developing a high-end reconfigurable computation platform for data acquisition and triggering. The system consists of a scalable number of compute nodes, which are fully interconnected by high-speed communication channels. Each compute node features 5 Xilinx Virtex-4 FX60 FPGAs and up to 10 GBytesDDR2 memory. A hardware/software co-design approach is proposed to develop custom applications on the platform, partitioning performance-critical calculation to the FPGA hardware fabric while leaving flexible and slow controls to the embedded CPU plus the operating system. The system is expected to be high-performance and general-purpose for various applications especially in the physics experiment domain.</p><p>As a case study, the particle track reconstruction algorithm for HADES has been developed and implemented on the computation platform in the format of processing engines. The Tracking Processing Unit (TPU) recognizes peak bins on the projection plane and reconstructs particle tracks in realtime. Implementation results demonstrate its acceptable resource utilization and the feasibility to implement the module together with the sys-tem design on the FPGA. Experimental results show that the online track reconstruction computation achieves 10.8 - 24.3 times performance acceleration per TPU module when compared to the software solution on a Xeon2.4 GHz commodity server.</p>
56

Možnosti využití moderních metod při efektivním zjišťování dendrometrických parametrů lesních porostů v provozních podmínkách nestátních lesních majetků / Modern methods of forestry mensuration and assessments in operational conditions in private forestry properties

Hanzlík, Jakub January 2016 (has links)
This thesis describes measurements of trees with modern caliper and electro-nic hypsometer in terms of non-state estates. The methodics was created in coopera-tion with a company Colloredo-Mannsfeld Ltd. There were mainly the work at sal-vage logging and how to use modern devices for various work .Further work was to verify the correctness of calculations and upgrades of software in the digital calliper Digitech Professional by Haglöf Sweden AB for Czech conditions. Followed by the assessment of the efficiency, reliability and comfort use of modern instruments for detecting supplies of wood.
57

Resistência a tospovírus, clonagem e caracterização molecular de alelos do loco Sw-5 em espécies de Lycopersicon / Resistance to tospovirus, cloning and molecular characterization of Sw-5 alleles from different Lycopersicon species

Lima, Gaus Silvestre de Andrade 23 January 2001 (has links)
Submitted by Cleber Casali (clebercasali@ufv.br) on 2017-06-28T17:17:51Z No. of bitstreams: 1 texto completo.pdf: 598650 bytes, checksum: 028a6d83725fd48a983ea2b8264aaa29 (MD5) / Made available in DSpace on 2017-06-28T17:17:51Z (GMT). No. of bitstreams: 1 texto completo.pdf: 598650 bytes, checksum: 028a6d83725fd48a983ea2b8264aaa29 (MD5) Previous issue date: 2001-01-23 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / O presente trabalho objetivou: 1) avaliar a resistência de acessos de Lycopersicon spp. a tospovírus; 2) estudar a herança da resistência em algumas dessas fontes e 3) clonar e caracterizar molecularmente alelos do loco Sw-5 provenientes de Lycopersicon spp. Plantas de 12 acessos de tomateiro, pertencentes às espécies L. peruvianum, L. chilense e L. hirsutum foram inoculadas com cinco isolados de tospovírus, pertencentes às espécies TSWV, TCSV, CSNV e GRSV. A reação das plantas foi avaliada periodicamente por 30 dias. Ao final desse período, as plantas assintomáticas foram confirmadas como resistentes, mediante DAS-ELISA. A resistência na maioria dos materiais foi de amplo espectro (efetiva contra todos isolados), porém em alguns casos a resistência foi do tipo isolado-es pecífica. Os materiais mais promissores foram os acessos PI 126928, LA 444/1, LA 371 e PI 126944 de L. peruvianum e LA 130 e LA 2753 de L. chilense. Esses materiais constituem fontes de resistência alternativas para o manejo das tospoviroses do tomateiro. O estudo de herança da resistência em L. hirsutum PI 134417 indicou que a resistência nessa fonte é condicionada por dois genes independentes, um dominante e um recessivo. Num teste de alelismo, o gene dominante segregou independentemente do gene Sw-5, indicando que são genes distintos. Em L. peruvianum PI 126928, a resistência segregou como uma característica condicionada por dois ou mais genes dominantes não ligados. Na terceira etapa do trabalho, comparou-se o nível de conservação de alelos do loco Sw-5 em Lycopersicon spp. Os alelos foram obtidos mediante PCR de longo alcance, utilizando-se o sistema ELONGASE TM (Gibco-BRL) para amplificação. Nas reações de amplificação foram utilizadas três combinações de oligonucleotídeos desenhados com base na seqüência do gene Sw-5. Como molde foi utilizado DNA extraído de plantas cuja reação a tospovírus já era conhecida. Foram obtidos 16 alelos do loco Sw-5, provenientes de quatro espécies do gênero Lycopersicon. Após uma pré-caracterização mediante clivagem com enzimas de restrição, 10 clones foram selecionados para seqüenciamento. A análise de seqüência dos alelos revelou identidade de nucleotídeos superior a 91% para a ORF completa. Quando a comparação foi realizada para os diferentes domínios que compõem o gene Sw-5, observou-se que as maiores divergências residem nas extremidades 5’ e 3’ do gene. A comparação entre as proteínas codificadas pelo alelo Sw-5 1 (confere resistência) e seu alelo sw-5 2 (confere suscetibilidade) revelou 53 substituições ao nível de aminoácidos. Destas substituições, 14 são não-sinônimas e se concentram na extremidade amino e nas LRR, indicando o provável envolvimento dessas regiões na especificidade da resistência. A análise funcional dos alelos do loco Sw-5 e a construção de quimeras entre os alelos Sw-5 e sw-5 2 estão em andamento e auxiliarão a estabelecer as bases moleculares da resistência do tomateiro a tospovírus. / Lycopersicon peruvianum, L. chilense and L. hirsutum germplasm was inoculated with five isolates from the tospovirus species Tomato spotted wilt virus , Tomato chlorotic spot virus , Chrysanthemum stem necrosis virus, and Groundnut ringspot virus. Several introductions showed resistance to all isolates. However, in some cases, resistance isolate-specific was also observed. PI 126928, LA 444/1, LA 371 and PI 126944 of L. peruvianum and LA 130 and LA 2753 of L. chilense were the most resistant materials. Inheritance studies showed that two independent genes, one dominant and one recessive, control the PI 134417 resistance. Allelism tests revealed that this dominant gene is not an allele of the Sw-5 locus. The resistance derived from PI 126928 segregated as a trait controlled by two or more non-linked dominant genes. Sixteen alleles of the Sw-5 locus were PCR-amplified from four Lycopersicon species, cloned and sequenced. The alleles possess more than 91% of identity at nucleotide level; the largest divergence was observed in the 5 ́and 3 ́ extremities. Sequence comparisons between the resistance allele Sw-5 1 and the susceptible allele Sw-5 2, revealed 53 amino acid substitutions; fourteen substitutions are non-synonymous and located at the amino and carboxi terminus of the protein. The functional analysis of the other alleles and the construction of chimeras between Sw-5 1 and Sw-5 2 will allow to identify the protein region involved in the resistance specificity.
58

Analýza úrovně informační gramotnosti studentů VŠ / ICT knowledge level analysis of university students

LHOTÁK, Jan January 2013 (has links)
This work talks about the level of information knowledge of University students. It investigates what kind of knowledge of informatics the entering students have or should have. The students should understands the basics of informatics and be able to operate elementary software. The entry requirements determine RVP and ŠVP. The knowledge of informatics is tested in the ITT subject in an Information Technology test, which is necessary for registration of further subjects at the Department of Informatics. The exit requirements for the University students are set by the creation of their thesis (Bachelors and Masters). The author of the thesis analysis ŠVP and RVP of Informatics for high school education and the information contained in Cermat catalogues. The thesis also analysis the requirements of particular departments. The IT tests will be changed according to the newly discovered requirements. The author will also create a semi automated machine for evaluation of IT tests. The software will enable the students to upload their files and compare them with the correct solution. The software will also show the percentage of success of the results.
59

Hardware / Software co-design for JPEG2000

Nilsson, Per January 2006 (has links)
For demanding applications, for example image or video processing, there may be computations that aren’t very suitable for digital signal processors. While a DSP processor is appropriate for some tasks, the instruction set could be extended in order to achieve higher performance for the tasks that such a processor normally isn’t actually design for. The platform used in this project is flexible in the sense that new hardware can be designed to speed up certain computations. This thesis analyzes the computational complex parts of JPEG2000. In order to achieve sufficient performance for JPEG2000, there may be a need for hardware acceleration. First, a JPEG2000 decoder was implemented for a DSP processor in assembler. When the firmware had been written, the cycle consumption of the parts was measured and estimated. From this analysis, the bottlenecks of the system were identified. Furthermore, new processor instructions are proposed that could be implemented for this system. Finally the performance improvements are estimated.
60

Mitteilungen des URZ 1/1994

Dippmann,, Fischer,, Richter,, Riedel,, Trapp,, Wagner,, Wegener,, Winkler, 30 August 1995 (has links)
WWW in Chemnitz Tcl/Tk Software -- kurz vorgestellt: Mathematica, NAG, Maple, MuPAD UNIRAS, PV-WAVE, Pro/ENGINEER SNIFF+, SPARCworks SYBASE PVM, EXPRESS SPSS XVision, PC/TCP FrameMaker, IslandPresents Parallelrechner des URZ

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