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Wyświetlanie 1-10 z 187
Tytuł:
Technologies for low cost small satellites
Autorzy:
Kurek, K.
Powiązania:
https://bibliotekanauki.pl/articles/307636.pdf
Data publikacji:
2007
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
small satellites
satellite systems
space technology
Opis:
Paper presents short description of satellite struc- ture and characterization of its subsystems. Review of tech- nologies used in small satellite missions is presented, consid- ering possible solutions in low cost projects. Three common solutions: the use of commercial off the shelf (COTS) compo- nents, miniaturization, remote testing and integration of sub- systems can be used to significantly reduce cost of the satellite.
Źródło:
Journal of Telecommunications and Information Technology; 2007, 1; 45-49
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Low cost alternative fuel from biomass
Autorzy:
Zeru, D.
Gebregergis, H.
Tilahun, M.
Sahu, O.
Powiązania:
https://bibliotekanauki.pl/articles/11526.pdf
Data publikacji:
2015
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Opis:
A major challenge for next decades is development of competitive renewable energy sources, highly needed to compensate fossil fuels reserves and reduce greenhouse gas emissions. Among different possibilities, which are currently under investigation, there is the exploitation of unicellular algae for production of biofuels and biodiesel in particular. Microalgae have the ability of accumulating large amount of lipids within their cells which can be exploited as feedstock for the production of biodiesel. The lipid content of different species of microalgae can range from 30%-70% of their dry weight. In this project a microalgae with lipid content of 60.095% was used. This means that 26gms of oil was obtained from 42gms of microalgae sample from which 17.624gm of biodiesel (FAME) was found at the end of trans-esterification. Algae biofuels avoid some of the previous drawbacks associated with crop-based biofuels as the algae do not compete with food crops. The favorable growing conditions found in many developing countries has led to a great deal of speculation about their potentials for reducing oil imports, stimulating rural economies, and even tackling hunger and poverty. Strong research efforts are however still needed to fulfill this potential and optimize cultivation systems and biomass harvesting.
Źródło:
International Letters of Natural Sciences; 2015, 05
2300-9675
Pojawia się w:
International Letters of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of Low-Cost Photodynamic Therapy Device
Autorzy:
Momchilov, N.
Bliznakova, I.
Borisova, E.
Troyanova, P.
Avramov, L.
Powiązania:
https://bibliotekanauki.pl/articles/2047897.pdf
Data publikacji:
2007-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.72.Bj
87.64.kv
87.19.xj
Opis:
Photodiagnosis and photodynamic therapy of non-melanoma skin cancers using delta-aminolevulinic acid/protoporphyrin IX (5-ALA/PpIX) give a combined application with broadest dissemination in the current clinical practice. The problems with using of lasers as light sources are the expenses associated with the operation of these types of installations. This is why we test the capability of cheaper sources - light-emitting diodes at 405 nm for fluorescence excitation of PpIX and 635 nm for photodynamic action initiation. A LED matrix is developed in our laboratory using two types of LEDs and a combined photodiagnosis/photodynamic theory device applicable for clinical practice is built. Geometrically matrix is formed in such way that power density at 635 nm is about 40 mW/cm$\text{}^{2}$, which allow to reach treatment doses for a 15-20 min irradiation depending of the lesion size in the focus of the system. The therapeutic mode of system developed can be used also with some other photosensitizers from the porphyrins derivatives family.
Źródło:
Acta Physica Polonica A; 2007, 112, 5; 1125-1130
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Low cost integrated navigation system for unmanned vessel
Autorzy:
Yang, C.
Wang, Q.
Powiązania:
https://bibliotekanauki.pl/articles/259693.pdf
Data publikacji:
2017
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
low cost
MEMS
inertial navigation
integrated navigation
Opis:
Large errors of low-cost MEMS inertial measurement unit (MIMU) lead to huge navigation errors, even wrong navigation information. An integrated navigation system for unmanned vessel is proposed. It consists of a low-cost MIMU and Doppler velocity sonar (DVS). This paper presents an integrated navigation method, to improve the performance of navigation system. The integrated navigation system is tested using simulation and semi-physical simulation experiments, whose results show that attitude, velocity and position accuracy has improved awfully, giving exactly accurate navigation results. By means of the combination of low-cost MIMU and DVS, the proposed system is able to overcome fast drift problems of the low cost IMU.
Źródło:
Polish Maritime Research; 2017, S 3; 110-115
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Low-cost Multicomputer for solving the RCPSP
Autorzy:
Pawiński, G.
Sapiecha, K.
Powiązania:
https://bibliotekanauki.pl/articles/106309.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
multicomputer
RCPSP
Opis:
In the paper it is shown that time necessary to solve the NP-hard Resource-Constrained Project Scheduling Problem (RCPSP) could be considerably reduced using a low-cost multicomputer. We consider an extension of the problem when resources are only partially available and a deadline is given but the cost of the project should be minimized. In such a case nding an acceptable solution (optimal or even semi-optimal) is computationally very hard. To reduce this complexity a distributed processing model of a metaheuristic algorithm, previously adapted by us for working with human resources and the CCPM method, was developed. Then, a new implementation of the model on a low-cost multicomputer built from PCs connected through a local network was designed and compared with regular implementation of the model on a cluster. Furthermore, to examine communication costs, an implementation of the model on a single multi-core PC was tested, too. The comparative studies proved that the implementation is as ecient as on more expensive cluster. Moreover, it has balanced load and scales well.
Źródło:
Annales Universitatis Mariae Curie-Skłodowska. Sectio AI, Informatica; 2016, 16, 1; 50-61
1732-1360
2083-3628
Pojawia się w:
Annales Universitatis Mariae Curie-Skłodowska. Sectio AI, Informatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fly me: financial mathematics and low-cost airlines
Autorzy:
Piwarska, Karina
Kulesza, Kamil
Powiązania:
https://bibliotekanauki.pl/articles/748386.pdf
Data publikacji:
2008
Wydawca:
Polskie Towarzystwo Matematyczne
Tematy:
91B28
Opis:
Rynki instrumentów pochodnych należą obecnie do jednych z najciekawszych obszarów badań w matematyce finansowej. Są też obszarem, gdzie spotykają się teoria i praktyka, tak ważne w rzetelnie uprawianej matematyce stosowanej. Zachodzi tam ożywiona wymiana idei pomiędzy matematykami a ekonomistami, choć de facto ma ona charakter bardziej interdyscyplinarny, angażując np. informatyków i fizyków. Równolegle dynamiczny rozwój rynków i pojawianie się coraz szerszej gamy instrumentów pochodnych pozwalają na włączanie do tego zbioru coraz to nowych obiektów. W naszej pracy pokazujemy, że skoro zakładać się można „o wszystko”, a instrumenty pochodne są rodzajem giełdowego zakładu, to bilety tanich linii lotniczych można opisać jako specyficzne opcje. Uwzględniając rzeczywiste warunki rynkowe i ograniczenia narzucone w regulaminach tanich przewoźników, przedstawimy alternatywny dla już istniejących sposób podejścia do wyceny takich instrumentów oraz metody konstrukcji i optymalizacji portfela złożonego z biletów, który może mieć zastosowanie zarówno do celów spekulacyjnych, jak i korporacyjnych.
The derivatives are financial instruments whose value changes in response to the changes in underlying variables. Originally, they were based on commodities and used to reduce risk from varying prices. This strategy is often called hedging. However as financial markets have become more complex it is more and more difficult to distinguish between old fashioned hedging and speculation. At present the derivatives’ markets are one of the most interestingfie lds of research in financial mathematics. They are the point where theory and practice meet, an important factor in good applied mathematics. As a result a vivid exchange of ideas takes place between mathematicians and researchers from huge variety of fields like economics, physics and computer science. In the same time the markets are constantly evolvinga nd new financial instruments are created every day. Nowadays, derivatives are beingc onstructed not only for assets such as commodities, equities , bonds, interest rates, exchange rates, but also various indexes or even weather. In order to make a transaction a buyer and a seller are needed. In this respect a financial instrument can be understood as a bet between two parties, each assumingtha t the market will move the way that they expect. In old times derivatives were mainly used to managed risk, for instance by securing fixed price for some asset in the future. One of the types of derivatives are options that provide the right, but not the obligation, to engage in a future transaction on some fixed conditions. The transaction as such does not need to concern assets or securities, for instance the option can be exercise on certain services. In the paper we show that low-cost airlines’ tickets can be described as an option contract. While it is temptingto plug-in our description into known models for option valuation, we choose more practice oriented approach. We take into account the real life constrains and airlines’ regulations we present a realistic model for option valuation. In such a framework we show that, in principle, an arbitrage is possible. We conclude the paper with remarks on buildingan d optimizingp ortfolio of such assets, having in mind speculation/trading as well as corporate hedging.
Źródło:
Mathematica Applicanda; 2008, 36, 50/09
1730-2668
2299-4009
Pojawia się w:
Mathematica Applicanda
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Low-Cost Data Acquisition Unit for Flight Tests
Autorzy:
Morawski, Błażej
Głowacki, Dominik
Głowacka, Anna
Powiązania:
https://bibliotekanauki.pl/articles/98014.pdf
Data publikacji:
2019
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:
helicopter flight test
LabVIEW
Arduino
Opis:
The purpose of this paper is to present the design of a data recorder for flight tests of a full-scale aircraft and an UAV. The recorder is built based on the Arduino microprocessor platform and LabVIEW development environment. The data recorder will be used mainly for helicopter flight tests.
Źródło:
Fatigue of Aircraft Structures; 2019, 11; 121-130
2081-7738
2300-7591
Pojawia się w:
Fatigue of Aircraft Structures
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Low-Cost Dynamic Constraint Checking for the JVM
Autorzy:
Grzanek, K.
Powiązania:
https://bibliotekanauki.pl/articles/108744.pdf
Data publikacji:
2016
Wydawca:
Społeczna Akademia Nauk w Łodzi
Tematy:
formal software verification
software quality
dynamic type-checking
functional programming
category theory
Clojure
Opis:
Using formal methods for software verification slowly becomes a standard in the industry. Overall it is a good idea to integrate as many checks as possible with the programming language. This is a major cause of the apparent success of strong typing in software, either performed on the compile time or dynamically, on runtime. Unfortunately, only some of the properties of software may be expressed in the type system of event the most sophisticated programming languages. Many of them must be performed dynamically. This paper presents a flexible library for the dynamically typed, functional programming language running in the JVM environment. This library offers its users a close to zero run-time overhead and strong mathematical background in category theory.
Źródło:
Journal of Applied Computer Science Methods; 2016, 8 No. 2; 115-136
1689-9636
Pojawia się w:
Journal of Applied Computer Science Methods
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Low-cost Monitoring System of a Sitting Posture
Autorzy:
Sieniawski, M.
Dimitrova-Grekov, T.
Klimowicz, A.
Powiązania:
https://bibliotekanauki.pl/articles/114379.pdf
Data publikacji:
2018
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
sitting position monitoring
RaspberryPi
graphical user interface
database
Opis:
The article presents a description of sitting posture monitoring system, built on Raspberry_Pi_3b, Tact Switch buttons, a prototype board and a rubber mat. RaspberryPi connected to the sensors communicated with a personal computer. This allows on the one hand to immediately inform the seated about the appearance of no symmetry of the position on the chair and managing the time of sitting and breaks on the other. The proposed system ensures identification of the degree of incorrect seating during work and gives the opportunity to improve the user's posture, which affects many topics related to health and work efficiency. System possesses a graphical user interface. During system operation, monitoring data is collected and can be used for further research towards an optimal impact on the user to get rid of the faulty sitting habits.
Źródło:
Measurement Automation Monitoring; 2018, 64, 1; 11-13
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
LOCAAS [Low-Cost Autonomous Attack System] dla Predatora.
Powiązania:
Aklot 2002, nr 3, s. 25-26
Data publikacji:
2002
Tematy:
LOCAAS (pocisk rakietowy) budowa i konstrukcje Stany Zjednoczone
Samoloty bezzałogowe uzbrojenie system Stany Zjednoczone
Pociski rakietowe kierowane klasy powietrze-ziemia budowa i konstrukcje Stany Zjednoczone
Opis:
Oprac. na podst. "Jane's Defense Weekly". --- 2002, 27 II; "AeroWorldNet". --- 2002, 4 III.
Dostawca treści:
Bibliografia CBW
Artykuł
Wyświetlanie 1-10 z 187

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