464 research outputs found
Antifungal effects of botanical leaf extracts of lantana camara, moringa oleifera, and tagetes minuta on rhizopus stolonifer in vitro
No full textAims: This research aims at testing the efficacy of different botanical leaf extracts, (Lantana camara, Moringa oleifera and Tagetes minuta) on soft rot fungi, Rhizopus stolonifer in vitro.
Study Design: The experiment was carried out in a 3*2 Factorial arrangement +2 controls in a Complete Randomized Design replicated three times.
Place and Duration of Study: Department of Agronomy Laboratory, Midlands State University, Gweru, Zimbabwe. The research was done between April 2016 and May 2016.
Methodology: Antifungal activity of the plant extracts was tested using the poisoned food technique. Colony diameter, percentage inhibition of the growth of mycelium and identification of functional groups in botanical leaf extracts were done. Mycelia growth diameter of the R. stolonifer was measured at day 3, 5, and 7 after inoculation. Identification of functional groups was done using the FT-IR Spectroscopy.
Results: There was an interaction between botanical plant type and concentration rate. L. camara at 60% concentration was most effective in controlling R. stolonifer, with a colony diameter of (4.3 cm) and an inhibition percentage of (48%). M. oleifera and T. minuta at 30% concentration gave the lowest colony growth inhibition of 30% and 31% respectively. FT-IR Spectroscopy confirmed the presence of phenols, alkanes, alkenes, anhydride and alkyl halide in all the three extracts. Amines were only detected in L. camara extract.
Conclusion: The data obtained provide additional information in support of plant extracts for control of R. stolonifer, though the efficacy of plant extracts tested still remain below that of the synthetic pesticide, (control). As the concentration of the extracts increased, the effectiveness of the extracts also increased
The IPHAS catalogue of H alpha emission-line sources in the northern Galactic plane
No full textWe present a catalogue of point-source H alpha emission-line objects selected from the INT/WFC Photometric Ha Survey (IPHAS) of the northern Galactic plane. The catalogue covers the magnitude range 13 <= r' <= 19.5 and includes Northern hemisphere sources in the Galactic latitude range -5 degrees < b < 5 degrees. It is derived from similar to 1500 deg(2) worth of imaging data, which represents 80 per cent of the final IPHAS survey area. The electronic version of the catalogue will be updated once the full survey data become available. In total, the present catalogue contains 4853 point sources that exhibit strong photometric evidence for Ha emission. We have so far analysed spectra for similar to 300 of these sources, confirming more than 95 per cent of them as genuine emission-line stars. A wide range of stellar populations are represented in the catalogue, including early-type emission-line stars, active late-type stars, interacting binaries, young stellar objects and compact nebulae.
The spatial distribution of catalogue objects shows overdensities near sites of recent or current star formation, as well as possible evidence for the warp of the Galactic plane. Photometrically, the incidence of Ha emission is bimodally distributed in (r' - i'). The blue peak is made up mostly of early-type emission-line stars, whereas the red peak may signal an increasing contribution from other objects, such as young/active low-mass stars. We have cross-matched our H alpha-excess catalogue against the emission-line star catalogue of Kohoutek & Wehmeyer, as well as against sources in SIMBAD. We find that fewer than 10 per cent of our sources can be matched to known objects of any type. Thus IPHAS is uncovering an order of magnitude more faint (r' > 13) emission-line objects than were previously known in the Milky Way
Asylum policy and housing for asylum seekers in the EU – A look at Malta’s open centres for asylum seekers
No full textThe new port infrastructure: strategic design of a container data platform for Port of Rotterdam
No full textSea ports are undergoing a digital transformation, which can offer benefits for many involved stakeholders in the logistic chain. In order to stay relevant, Port of Rotterdam (PoR) should invest in developing new port infrastructure; digital connections that facilitate data exchange between logistic chain stakeholders. A strategic digital opportunity was found for PoR, design a platform that is focused on container data, which contributes to the competitive position of the port of Rotterdam and the business model of PoR. The thesis explores the design of the platform Cadex, a data platform that facilitates cargo data exchange between data suppliers, e.g. terminals and data demanders, shippers. Cadex offers shippers real-time data about their containers that enables shippers to act upon containers that deviate from the planned schedule. By making cargo data easy accessible it could save shippers significant costs that come with transport, the deprecation of their goods, the management of their logistics and their inventory. Especially in time sensitive trade, like fresh goods or factory parts this data is valuable. In addition, it could also contribute to a lower carbon footprint of shipments. The platform enables users to get data directly from the data owners (data supplies) like sea-port terminals and hinterland terminals and can therefore be labeled as reliable data. The data suppliers benefit from the revenue model the platform offers for their data and they are allowed to set their own asking price for this data, furthermore they benefit from the data they receive about their clients. PoR would directly benefit from the data exchange by charging a percentage of the price. In addition, PoR receives historical data about its clients, which improves their knowledge about the clients they serve and could be input for improvements in the port of Rotterdam. Moreover, a better customer service is offered to shippers that make use of the port of Rotterdam. The new port infrastructure Cadex offers, could improve the score of the port Rotterdam on the selection criteria and therefore, contribute to a higher competitive position. Developing this new port infrastructure is a long-term investment since the connections hold value. Once built, the infrastructure can be reused by other parties or other digital purposes with some adjustments. This makes PoR a relevant party in the digital transition. Without this new port infrastructure, PoR is more likely to be bypassed by other competing players who will reap the benefits of the digital transformation in sea-ports.Strategic Product Desig
Field Of Threads: Master’s Thesis on a tool for clarifying thread behavior
No full textMultithreaded programming is becoming increasingly important because of recent increase in the use of multiprocessor computing. Multithreaded or concurrent programming is inherently more complex than single threaded code, requiring the use of synchronization and causing possible problems like deadlock or dormancy. Dynamic analysis tools can aid in understanding the execution of concurrent programs and help with improving and debugging of these programs. Current tools express the complexity of concurrent programs with varying degrees of success. We have evaluated and analyzed the visualizations of these tools in relation to the inherent concurrency problems they were meant to solve and come up with an alternative approach to tracing, analyzing and visualizing program executions. By focusing on the use of shared fields we show memory based interaction between threads by use of sequence diagrams, structured in a novel way. This new approach is implemented in a Java based, Eclipse plugin, dynamic analysis tool called Field Of Thread (FOT). FOT provides a new low-level perspective to concurrency oriented dynamic analyses for visualizing shared memory based thread interaction.Computer and Information Science - Software EngineeringSoftware Engineering Research Group (SERG)Electrical Engineering, Mathematics and Computer Scienc
Calculation of Polymer-Solvent Phase Equilibria Using the SAFT Equation of State
No full textAt the Institute for Thermodynamics at the Technical University Berlin a program is under development for the calculation of phase equilibria. The program uses the SAFT equation of state without the association term. Interests lie especially in the calculation of equilibria of mixtures of non-associating polymers in solvents. The Institute faced huge numerical problems. A study after the causes of these problems was performed and the known problems with SAFT were solved…Applied SciencesScheikundige Technologie en der Materiaalkund
Projectontwikkeling door woningcorporaties, wat kost dat?
No full textEen onderzoek naar de specificatie van de proceskosten bij projectontwikkeling door woningcorporaties. In het onderzoek wordt ingegaan op de huidige methodiek die wordt toegepast door woningcorporaties, waarna wordt onderzocht hoe dit mogelijk verbeterd kan worden.HousingReal Estate & HousingArchitecture and The Built Environmen
The profitable influence of lease incentives for new office developments: A research on the phenomenon of office real estate developments (out)competing existing assets on effective rent levels without loss of quality
No full textDutch developers are thought to have been able to outcompete the owners of existing office space on rental pricing (the phenomenon). For tenants it was more inexpensive to move to newly proposed (not yet existent) office space than to remain where they are, or move to other existing office space. Three theoretical reasons were identified for the phenomenon to exist: 1) rent price lagging of existing assets to new market information, 2) lower production costs for the new development and 3) the creation of margin between development costs and asset selling price. Especially the latter has had influence on the phenomenon's existence. Three main aspects are identified for the creation of margin: 1) A period of Yield Compression (2004-2008) enabled great selling prices to be obtained. Thereby margin was created. It also led to a decrease in financing costs and allowed for the neglect of given lease incentives by developers, 2) the use of the normative residual land value method enabled margin to exist altogether and allowed for additional margin to be created, and 3) the use of Lease Incentives by the developer has shown to have an amplifying effect: Profit Sharing/the High-Low Method effectively lowers the rent level of the tenant by making maximum use of the created margin. Sources used: literature, expert interviews, key-actor interviews, dataset analysis and sensitivity analysis.Real Estate ManagementReal Estate & HousingArchitectur
Onderzoek naar de invloed van onvolkomen doorlassing op de vermoeiingssterkte van een lasverbinding
No full textDe achterassen van de DAF-vrachtwagens bestaan uit twee aslichaamhelften. Deze worden door een lasverbinding met elkaar verbonden. De lasverbinding heeft een doorlassingspercentage van ongeveer 80%. Het doel van dit onderzoek is de mogelijkheden na te gaan om verlaging van de doorlassingsgraad bij een vereiste vermoeiingssterkte van de lasverbinding. Ter bepaling van de vereiste vermoeiingssterkte moeten de optredende vermoeiingsbelastingen worden bepaald. Alleen de vermoeiingsbelastingen veroorzaakt door het torsiemoment en door de dwarskracht ten gevolge van het verticale moment blijken volgens de theorie schadelijk te zijn voor de lasverbinding. Deze kunnen een mode-3 scheurgroei vanuit de onvolkomen doorlassing veroorzaken. Met gegevens van wegmetingen is berekend dat het spanningstrajekt van deze vermoeiingsbelasting 36,3 N/mm^ bij 10® wisselingen bedraagt bij een spanningsverhouding van - 1. Er wordt door DAF geëist dat de lasverbinding deze vermoeiingsbelasting met een drie maal grotere levensduur kan weerstaan. De minimaal vereiste vermoeiingssterkte voor de lasverbinding is dus op een spanningstrajekt van 36,3 Wmnf bij een levensduur van 3x10® wisselingen gesteld. Voor de vermoeiingsexperimenten zijn proefstukken van de lasverbinding vervaardigd met verschillende doorlassingsgraad. Er zijn zowel mode-1 als mode-3 vermoeiingsexperimenten uitgevoerd. Op basis van de resultaten van deze experimenten kan geen uitspraak worden gedaan over de exacte minimaal toe te laten doorlassingsgraad van de lasverbinding. De resultaten hebben wel aangetoond dat een verlaging van het doorlassingspercentage tot een waarde van 70% zeer waarschijnlijk haalbaar is.Welding Technology and Non-destructive TestingTechnische MateriaalwetenschappenApplied Science
[[alternative]]Diagnosis and Teaching on Students'Conceptions of Energy in the
No full text[[abstract]]兒童時期是一個人知識獲取與價值判斷形成的關鍵時期，在能源日益缺乏
的今天，去了解學童對能量、能源的認知，並進一步發現學生的錯誤概念
及其形成的原因，是今日我們所必須加以研究、探討的一項重要工作。本
研究主要的目的為（1）探討學童之認知發展階層以及對能量之『前期概
念』間的關係。（2）探討國小四、五、六年級學生在能量概念上的思考
模式。（3）比較不同年級及性別的學生在能量概念上的差異性。（4）探
討學童之認知發展階層與能量概念之間的關係。（5）比較故事類型的類
比教學法對改變國小學童能量錯誤概念的成效。本研究在前期概念方面採
用『開放式工具』，在能量概念測驗上採用『紙筆式』及『圖形診斷』兩
項工具，而在探討認知發展階層方面則以『比例推理工具』為測驗工具對
台北縣三所國小四、五、六年級學生共757名（男382名，女375名）進行
測試。 研究結果發現（1）在所取樣的國小四、五、六年級中，比例推理
能力的有無與能量前期概念之間並無明顯的關係存在。而由學生的回答中
發現，大部分受試學生的能量前期概念皆為『人類為中心』；『力量的來
源』；『卡通人物或電動玩具』的能源觀。（2）國小四、五、六年級學
生接受紙筆式測驗能量概念時，各年級間在統計上有顯著差異存在（
p<.001）。以圖形診斷工具測試能量概念時，受試者在年級間也具有統計
上顯著的差異（p <.01）：六年級成績最高，五年級次之，四年級為最低
。（3）紙筆式測驗能量概念時，性別間達統計上之顯著差異（p<.01）且
男生的成績表現優於女生。而以圖形診斷能量概念時，受試者性別間未達
統計上顯著差異。（4）男生的比例推理能力與其能量概念之紙筆試測驗
，兩者間有顯著的關係（r =.18 p<.001），即具有比例推理能力（pp1
）的男生，其紙筆試測驗的成績也相對較高；但對女生而言，它們之間在
統計學上則未達顯著差異。另一方面，在學生比例推理能力與以圖形診斷
能量概念之測試結果，僅六年級的學生在統計上有顯著差異（p<.01），
即六年級的學生中具有比例推理能力者，其圖形診斷工具測試結果的分數
相對也會越高。（5）在以故事型態之類比教學法的成效方面：控制組學
生在紙筆式測驗上，前測與後測平均分數的t值考驗未達統計上的顯著水
準，而實驗組則達統計上的顯著水準（p<.001），此結果顯示接受類比教
學法的實驗組學生，在學習能量概念時具有正面的效果。
childhood is the crucial period for a person to acquire the
knowledge and form the concept of value judgment. energy concept
is required day by day. As a result, it is an essential work for
us to investigate the children's conception of energy .
Moreover, we have to study their misconceptions, and explore the
factors of the misconceptions . the purposes of this study were
as follows： （1）to explore the relationship between students'
proportional reasoning ability and their preconception of
energy. （2）to investigate the thinking modes of the energy
conception among different grade levels in elementary schools.
（3）to examine the interaction of students' conceptions of
energy between grade levels and genders.（4）to explore the
relationship between students' proportional reasoning ability
and their conceptions of energy. （5）Using story format to
compare the students' conceptual change in energy by an analogy
teaching strategy. the instruments for this study were as
follows ： paper-and- pencil task and diagnostic graphic task
of energy conception. In addition , we use the open-ended task
for examine the preconception of energy and the proportional
reasoning task for evaluate the levels of cognitive development.
the subjects in this study were 757 elementary school pupils
（382 male, 375 female）included fourth, fifth and sixth grade
students.the major findings of this study were as follows： （1
）As to the fourth , the fifth and the sixth grade students,
there did not exist obvious relation between the proportional
reasoning ability and the preconception of energy. From their
answers we could find out that the preconception of energy were
remained as in the domain of human- centered, the source of
power, and the conceptions from cartoons or tv-games.（2）there
existed significant difference between the conception of energy
in paper-and-pencil test and the grade levels （p<.001）. in
addition, there was a significant difference among grade levels
in the results of graphic diagnostic test（p<.01）. the higher
was the grade , the better was the performance .（3）there
existed a gender difference for the paper-and-pencil test of
energy conception. the males performed better than the females
in spite of the grade levels. however, there was no significant
difference between the results of the graphic diagnostic test
with regard to gender difference.（4）as to the males, there was
a significant relation between the proportional reasoning
ability and the paper-and-pencil test（p<.001）: the higher was
the proportional reasoning ability , the better was the
performance . however, as to the females, there was no
significant difference statistically. Besides, there existed the
significant relationship between the proportional reasoning
ability and the graphic diagnostic test only in the sixth grade
students: those who had proportional reasoning ability , will
performance better in graphic diagnostic test. （5）in
concerning the effect of the story-format analogy teaching
method, it showed no significant difference statistically
between pre-test and post-test in the control group. on the
contrary, there was a significant difference in the experiment
group （p<.001）. all the results revealed that analogy teaching
is a strategy which can strengthen the effect on the experiment
group when they learn the energy concept.
childhood is the crucial period for a person to acquire the
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