Wyniki wyszukiwania - BazTech

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Techniques of mobile application development process

Druć Mateusz, Jóźwiak Ireneusz J., Jóźwiak Alicja M., Nowak Wojciech M.

Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska

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2021

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z. 153

77--88

EN

Purpose: The purpose of the paper is to present the approaches of developing mobile applications and the technologies used for this process to facilitate the choice of the right programming approach in the initial phase of an IT project. Design/methodology/approach: Taking the right and adequate decision on choosing the proper approach to software development should be preceded by searching for available solutions and a there reliable comparison. The collected and compared information comes from current scientific sources and official conferences, which is the basis for making the right decisions at the start of a new project. Findings: Hybrid approach to the manufacture of mobile applications provide applications to run the most popular mobile operating systems. However, the technologies used in this programming approach are not adopted to the extent they have been in the native approach. Originality/value: The article summarizes and compares the approaches of developing mobile applications. The presented comparison, together with information on the used technologies, helps system architects and programmers in making a decision about the use of a given programming approach based on the given technologies when creating a new project.

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Impact of artificial coastal protection structures on Ascidians settlement along the Tamil Nadu coast, India

Jebarathanam Prince Prakash Jebakumar, Nandhagopal Ganesan, Rajan Babu Bose, Ragumaran Shunmugavel, Ramakritinan Chokalingam Muthiah, Ali Abdul Jaffar, Arshan Mohammed Kaleem, Ravichandran Vijaya

Oceanologia

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2019

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No. 61 (1)

60--67

EN

Ascidians are one of the dominant marine sedentary filter feeders recorded more frequently as introduced species than other taxa. It is renowned that artificial structures offer novel niches to the non-native species. A yearlong investigation was carried out to understand the role of ascidian colonization on various artificial structures located along 84 stations stretched on the 1076 km long Tamil Nadu coast of South India. It revealed the occurrence of 26 ascidian species, among these18 specimens were identified to species level, 8 were identified to genus level based on morphological characters. As on origin and nativity, out of the total 26,3 species were classified as introduced, 8 specieswere classifiedas native and 15 as cryptogenic species. Interestingly, Polyclinum isipingense and Diplosoma variostigmatumwere reported first time inIndianwaters.Thecryptogenic and colonial forms of ascidians are dominant in the artificial structures. There were significant differences observed between artificial structure type, geographic locations ( p = 0.0071) and between ascidians forms as well as geographic areas ( p = 0.00375). This study also confirms the artificial structures offer new niches for non-native ascidian colonization. The influence of the substrate (structure type) aswell as geographic locations on the biotic assemblage was also observed.

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Impact of Chinese mitten crab Eriocheir sinensis on blue mussel Mytilus edulis trossulus – laboratory studies of claw strength, handling behavior, consumption rate, and size selective predation

Wójcik D., Normant M., Dmochowska B., Fowler A.

Oceanologia

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2015

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No. 57 (3)

263--270

EN

We examined the claw strength, handling behavior, consumption rate, and size selective predation of the invasive Chinese mitten crab Eriocheir sinensis feeding on native Baltic Sea blue mussels Mytilus edulis trossulus during 24 h laboratory experiments. Single starved crabs were offered 15 mussels (five mussels in three length classes) at a time. The total number of mussels consumed by a single crab increased significantly (P < 0.05) with the experimental time from 1.7 ± 0.7 # mussels crab−1 h−1 after 4 h to 0.2 ± 0.7 # mussels crab−1 h−1 after 24 h. The highest consumption rate was observed within the first 4 h, and it decreased significantly (P < 0.05) during the experiment. This was most likely due to the crabs being starved before the start of the experiment. E. sinensis can also harm blue mussel shells by crushing them without further consumption. The mean daily damage, and not consumption, by a single crab was 0.9 ± 1.4 of 11–40 mm mussels. The claw strength of E. sinensis ranged from 1.50 to 20.43 N (mean 8.51 ± 5.93 N) and was significantly correlated (P < 0.05) with sex and both claw size and carapace size. The study showed that E. sinensis may be able to impact the native M. edulis trossulus population abundance in the coastal Baltic waters either through direct predation or indirect mortality by damaging (crushing) the shell.

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Determining critical amino acid contacts for knotted protein folding

Dąbrowski-Tumański P., Niewieczerzał S., Sułkowska J. I.

TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk

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2014

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Vol. 18, No 3

265--279

EN

Proteins with a non-trivial topological structure are currently well recognized, while a knotted protein chain represents a new motif in protein three dimensional folds. Recent comprehensive analysis of the Protein Data Base shows that knotted proteins represent 1.5% of known protein structures. Determination of a free energy landscape of knotted proteins, and its understanding provides a serious challenge for both experimentalists and theoreticians. Moreover the role of a knot for biological activity of protein still remains elusive. In this work we study the smallest knotted proteins ( PDB code 2efv) to understand/investigate their free energy landscape, by means of extensive molecular dynamics simulations. We explore the dependence of the thermodynamics, kinetics and protein folding pathways on the native-likes contact maps and on the length of the chain. We analyze two sets of native-like contacts , which differ by a number of long range interactions, and we consider the 2efv protein with two different lengths of its C-terminus end. We identify the subset of native contacts sufficient to explore the entire free energy landscape. Then, we analyze the influence of the remaining set of native contacts – we show that the set of additional contacts may enhance folding kinetics, and that it has an influence on folding pathways.

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The effect of climate on tree-ring chronologies of native and nonnative tree species growing under homogenous site conditions

Feliksik E., Wilczyński S.

Geochronometria

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2009

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Vol. 33

49-57

EN

Dendroclimatic studies were carried out in the experimental stands composed of many tree species situated in the Polish part of the Baltic sea-coast. Increment cores were taken from a 100- years old trees of 2 native species: Norway spruce (Picea abies (L.) Karst.), and Scots pine (Pinus sylvestris L.) and 3 nonnative species: Douglas fir (Pseudotsuga menziesii (Mirb.) Franco), Sitka spruce (Picea sitchensis (Bong.) Carr.) and Silver fir (Abies alba Mill.). Thirty trees of each species were cored. The relationships between the diameter increment and the thermal and pluvial conditions during the period from 1925 to 2005 were analyzed on the basis of standardized tree-ring chronologies and climatic data. It was found that precipitation and temperature of the growing season and months preceding that season affected the annual diameter increment of all investigated tree species. The current year winter and early spring temperatures as well as February and August precipitation had a similar effect on the variation of diameter increment of trees. On the other hand thermal and pluvial conditions of the current year June differentiated the increment rhythm of individual species. A very strong negative effect on diameter growth of trees was observed in the case of winter and early spring frosts. Norway spruce turned out to be a species most resistant to low temperatures. The investigated tree species, especially Norway spruce, was susceptible to water deficiency in the soil during spring and summer. In the case of Scots pine a high precipitation in June stimulated its growth. The diameter increments of Douglas fir, Sitka spruce, Scots pine, and Silver fir were more strongly connected with air temperature than with precipitation. So called all-species chronology of tree-ring width, constructed during this study, permitted to verify the factors having a similar effect on growth response of the investigated tree species. It reflected the mutual characteristics of diameter increments of trees of various species.