Nowa wersja platformy, zawierająca wyłącznie zasoby pełnotekstowe, jest już dostępna.
Przejdź na https://bibliotekanauki.pl
Preferencje help
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 17

Liczba wyników na stronie
first rewind previous Strona / 1 next fast forward last
Wyniki wyszukiwania
help Sortuj według:

help Ogranicz wyniki do:
first rewind previous Strona / 1 next fast forward last
PL
Punkty podstawowej osnowy grawimetrycznej kraju, założone w łatach 60. nie były stabilizowane trwałymi znakami. Tylko 18 punktów 1 klasy miało trwałą stabilizacją. Zachowane punkty osnowy zostały, w sensie fizycznym, włączone do nowej osnowy, co pozwoliło na dokonanie ograniczonej z konieczności analizy porównawczej obydwu osnów.
EN
Basic gravimetric framework of Poland, established in fifties and sixties, consisted of points of first and second order. 18 points of first order were stabilised, while the remaining points were not stabilised. The network measured at the beginning of sixties was adjusted in 1964 to three international points: Warszawa, Poczdam and Praga. In 1971 new obligatory system for all gravimetric works, called System 1971, was accepted. Consequently, the Institute of Geodesy and Cartography started to recalculate the existing gravimetric network to this system. The existing network was adjusted to 5 international points: Gdansk, Warszawa, Krakow, Poczdam, Praga and to 10 points of gravimetric base. Old points o f gravimetric network, having permanent stabilisation, were included into new framework. In consequence, it resulted in limited comparative analysis of both networks.
2
63%
EN
The paper presents the simple technique of speaker gender recognition that uses MFCC features typically applied in automatic speech recognition. Artificial neural network is used as a classifier. The speech signal is first divided into 20 ms frames. For each frame, Mel-Frequency Cepstral Coefficients are extracted and the created feature vector is provided into a neural network classifier, which individually classifies each frame as male or female sample. Finally, the whole utterance is classified by selecting the class, for which the sum of corresponding neural network outputs is greater. The advantage of the method is that it can be easily combined with speech recognition, because both processes (gender recognition and speech recognition) are based on the same features. This way, no additional logic and no extra computational power is needed to extract features necessary for gender recognition. The method was experimentally evaluated using speech samples in English and in Polish. The comparison with other methods described in literature based on other feature extraction methods shows the superiority of the proposed approach, especially in cases where the recognition is carried out in noisy environment or using poor audio equipment.
3
Content available Właściwości sorpcyjne wybranych gatunków ryżu
63%
PL
W pracy wyznaczono izotermy adsorpcji i desorpcji wody dla wybranych gatunków ryżu metodą statyczno-eksykatorową w temperaturze 25°C, w zakresie aktywności wody od 0,113 do 0,932 (adsorpcja) i od 0,810 do 0,113 (desorpcja). Do badań użyto ryż długoziarnisty biały, brązowy, czerwony, czarny i biały parzony. Stwierdzono, że izotermy adsorpcji i desorpcji wody badanych gatunków ryżu miały kształt sigmoidalny i zgodnie z klasyfikacją Brunauera i in. odpowiadały II typowi izoterm. Do opisu izoterm adsorpcji i desorpcji wody zastosowano modele Oswina, GAB, Lewickiego i Pelega. Modele GAB, Lewickiego i Pelega bardzo dobrze opisywały otrzymane izotermy adsorpcji i desorpcji wody. Obliczony średni błąd kwadratowy (RMS) nie przekroczył 6,5 %. Wszystkie izotermy wykazały pętlę histerezy, przy czym największą pętlą histerezy charakteryzował się ryż biały parzony, a najmniejszą ryż czarny. Zawartość wody w monowarstwie wyznaczona w modelu GAB była większa w procesie desorpcji niż w procesie adsorpcji wody dla wszystkich badanych gatunków ryżu. Ryż biały posiadał największą zawartość wody w monowarstwie w obu procesach (7,182 g wody·100 gˉ¹ s.m. – adsorpcja; 11,162 g wody·100 gˉ¹ s.m. – desorpcja). Największą powierzchnię właściwą posiadał ryż biały (254,7 m²·gˉ¹ s.m.), a najmniejszą ryż biały parzony – 158,0 m²·gˉ¹ s.m.
EN
In the study presented in the paper water adsorption and desorption isotherms were determined for selected species of rice at 25°C over a range of water activity from 0.113 to 0.932 (adsorption) and from 0.810 to 0.113 (desorption) by static gravimetric method. The study used long-grain white rice, brown, red, black and parboiled. The water adsorption and desorption isotherms of the tested species of rice had a course compatible with type II of isotherms according to the Brunauer classification. For the description of the water adsorption and desorption isotherms the Oswin, GAB, Lewicki and Peleg models were used. The GAB, Lewicki and Peleg models gave very good fit to the experimental sorption data. The calculated root mean square error (RMS) did not exceed 6.5%. All isotherms show hysteresis loop, while the highest hysteresis loop characterised parboiled rice and the smallest – black rice. The water content in the monolayer determined in the GAB model was higher than the desorption process in adsorption for all species of rice. White rice had the highest water content in the monolayer in both processes (7.182 g water·100 gˉ¹ d.m. – adsorption; 11.162 g water·100 gˉ¹ d.m. – desorption). The largest specific surface area was noted for the white rice (254.7 m²·gˉ¹ d.m.) while parboiled rice had the smallest value of that parameter (158.0 m²·gˉ¹ d.m.).
5
Content available remote Tatrzańska grawimetryczna baza kalibracyjna
63%
PL
Analizę oparto na wynikach przeprowadzonych czterech testów: testu na materiale katalogowym, testu na materiale mapowym, testu terenowego oraz testu poprawności odwzorowania profili punktów geologicznych. Celem analizy było określenie faktycznej dokładności określenia współrzędnych dowolnego punktu zawartego w bazie danych grawimetrycznych po jego transformacji z układu "Borowa Góra" na układ "1942". Opisano przeprowadzone testy, a wyniki ich wraz z oceną dokładności przedstawiono w postaci tabelaryczno-graficznej.
EN
Special algorithm and caIculation program prepared at the Institute of Geodesy and Cartography, called BG/42, enabled transformation of coordinates of about million gravimetric points stored at the geological database from "Borowa Gora" to "1942" coordinate system. Formal error of recaIculating with the use of this program is [...]4.5 m. However, real accuracy of point location after transformation is influenced by accuracy of determination of points stored at the gravimetric database. In order to asses real accuracy of transformation of coordinates with the use of the method prepared at IGiK, the following tests were carried out: - on the catalogue data - on the map data - field test of correctness of point location on geological profiles. It results from the conducted tests, that coordinates of points, stored at the geological database in "Borowa Gora" coordinate system are affected with large errors, consisting of errors of mapping based of terrain details and of errors of reading point coordinates from maps. Total error due to these reasons is [...]104 m, while error of transformation method itself of [...]4.5 m is not large, which was documented by field test on geodetic points. Hence real precision of determination of location of gravimetric point stored at the geological database after its transformation from "Borowa Gora" to "1942" coordinate system can re ach [...]105 m. However, for majority of points located on map sheets around central meridians 15o and 21o value of this error does not exceed 100 m, which was confirmed by results of field test.
PL
W niniejszym artykule przedstawiono wyniki prac związanych z transformacją współrzędnych geodezyjnych z układu "Borowa Góra" na układ współrzędnych "1942". Zbadano cztery warianty rozwiązania zagadnienia z uwzględnieniem dwóch poziomów dokładności. Wykonano transformację współrzędnych Płaskich X i Y metodą Ryšavego oraz współrzędnych sferycznych B i L metodą Buršy-Wolfa, które są metodami ścisłymi. Zaprezentowano również możliwość dokonania transformacji współrzędnych metodami przybliżonymi: metodą średnich wartości \deltaX i \deltaY dla arkuszy map w skali 1: 1 00 000 oraz metodą strefową. W wyniku przeprowadzonych na wybranym materiale mapowym testów opracowano algorytm i program obliczeniowy, który posłużył do przeliczenia, z dokładnością [...]4.5 m, współrzędnych punktów z układu "Borowa Góra" na układ "1942". Dokonano również porównania, w formie graficznej, wyników uzyskanych przy użyciu ścisłych i przybliżonych metod transformacji.
EN
Studies on transformation of "Borowa Gora" to "1942" coordinate system were undertaken in order to express geological gravimetric data in uniform, presently obligatory coordinate system and in homogeneous gravimetric system. Four variants of solution of this problem were studied, considering two levels of accuracy. First level consists oftwo precise transformation methods: - Ryšavy method, which ensure accuracy of re-calculation of [...] 0.50 m; - Buršy-Wolf method, ensuring accuracy of re-calculation of [...] 0.7 m. Second level comprises approximate methods: - method of mean values, ensuring accuracy of transformation of [...]4.5 m; - zonal method, which ensures accuracy from [...] 5 m to [...] 8 m. It was found in the course of the tests, conducted on the selected maps, that method of mean values, ensuring accuracy of trąnsformation of [...] 4.5 m is the most useful for geological-geophysical documentation. Method of mean values, for which special algorithm and calculation program was prepared at the Institute of Geodesy and Cartography, was applied for transformation from "Borowa Gora" to "1942" coordinate system of about million gravimetric points stored at the geological database.
PL
Przedstawiono opis osnowy oraz szczegóły dotyczące prac pomiarowych na punktach osnowy, które były wykonane w latach 1994-1997.
EN
Basic gravimetric network of Poland was established in sixties, so now it does not fulfil the modern needs of geodesy, especially considering more common recent use of satellite measuring techniques. In 1977 the general project of modernisation of the network was prepared in the Institute of Geodesy and Cartography and approved by the Head Office of Geodesy and Cartography. All new points of the modernised gravimetric network were stabilised by concrete poles between 1978 and 1987, but the measurements were possible only in 1992, when the newest La Coste & Romberg gravimeters were purchased by the Institute of Geodesy and Cartography. Project of gravimetric network, verified by experts from the Geodesy Committee, Polish Academy of Sciences, was approved again by the Department of Surveyor General of Poland in 1993. New gravimetric network comprises fundamental point, located in the Observatory of the Institute of Geodesy and Cartography in Borowa Gora, which was already used several times to measure absolute acceleration of gravity, 16 absolute points (9 of which were already measured), 351 stabilised terrain points and two meridian’s calibration base lines, based on 6 absolute points. The Institute of Geodesy and Cartography started to measure the new network in 1994 and the measuring works were completed finally in 1997. Values of differences in acceleration of gravity Ag were calculated using scales of gravimeters determined on the basis of national gravimetric network, and next were re-calculated in 1997 to the system defined by absolute points. The whole network consists of 674 spans, where 722 measurements of differences in acceleration of gravity [delta]g were performed. It must be emphasised, that 62% of errors of Ag values measured on network spans does not exceed 0.010 mGal, while criterion of correctness is 0.020 mGal.
10
Content available remote Vertical gravimetric calibration baseline in the Tatra Mountains of Poland
51%
EN
This article describes the establishment of an alpine gravimetric calibration baseline in Poland's Tatra Mountains and the development of a methodology for performing static gravimeter calibration on that baseline. This baseline was established in response to the recent rise in geodynamic research in mountainous areas and the related need to calibrate the gravimetric scale used in such gravimeter research to a high degree of accuracy. The fact that the environmental conditions of such an alpine gravimetric calibration baseline differ considerably from those observed in flat terrains made it necessary to study the impact which rapid changes in atmospheric pressure and environmental temperature may exert on the performance of gravimeters used in such survey. It was also important to study how the method by which the instruments were transported (by automobile, cable car, or on foot) affected their performance. The project led to the establishment of an alpine gravimetric calibration baseline and yielded a set of recommendations for how to proceed with scaling the gravimeters at such a baseline.
PL
Przedstawione prace związane są z założeniem górskiej grawimetrycznej bazy kalibracyjnej w Tatrach oraz opracowaniem metodyki przeprowadzania na niej kalibracji grawimetrów statycznych. Założenie takiej bazy wynika z nasilenia w ostatnich czasach badań geodynamicznych w górach i związaną z tym potrzebą ujednolicenia na wysokim poziomie dokładności skali grawimetrycznej, używanych do tych badań grawimetrów. Z uwagi na znaczące różnice warunków środowiskowych na bazie górskiej w porównaniu z tymi, jakie obserwuje się na bazach zakładanych w terenach płaskich, niezbędne było przeprowadzenie badań wpływu szybkich zmian ciśnienia atmosferycznego i temperatury otoczenia na pracę grawimetrów, które są używane w pracach pomiarowych. Niemniej ważne było zbadanie wpływu wykorzystywanego środka transportu (samochód, kolej linowa, ręczny transport instrumentów) na pracę instrumentów rodzaju. W wyniku przeprowadzonych prac utworzona została górska grawimetryczna baza kalibracyjna oraz podano zalecenia jak należy postępować przy skalowaniu grawimetrów na tej bazie.
EN
The activity of the cymiazol salts of oxalic and boric acids against Ascopharea apis fungi was examined. A method of synthesising cymiazol salts was elaborated. The pathogenic fungi were isolated from honeybees infected with chalk brood. Fungistatic and fungicidal properties of the salts were examined in vitro, though their efficacy was tested in vivo in the infected beehives of honeybee colonies. Although cymiazol oxalate showed a slightly higher inhibiting activity than borate (MIC = 0.008 mol/L and 0.012 mol/L, respectively), the latter is a definitely stronger fungicide (MFC > 0.032 mol/L for oxalate, as compared with 0.012-0.014 mol/L for borate). Used separately, none of these active ingredients (boric acid, oxalic acid, cymiazol) was effective as fungicide, exhibiting only fungistatic properties in tested concentrations. High fungicidal efficacy was displayed only by cymiazol borate. Studies on honeybee colonies confirmed the effectiveness of the salts of cymiazol in treating ascosphaeriosis. After 12-16 days of administering sugar syrup containing these preparations, either a considerable alleviation of the symptoms or even their complete abatement were observed. In families cured with a mixture of cymiazol oxalate and borate a complete abatement of symptoms was obtained. Cymiazol salts can be a valuable and safe supplement of fungicidal formulations used in apiculture.
12
Content available remote A new gravimetric control network for Poland
45%
EN
Sodium salts of ethyl N,N-dimethyl- and N,N-dimethylamidophosphoric acids I and II were obtained and their hydrolysis to respective acids was investigated. The salts and acids were characterized by spectral methods (MS, FT/IR, 1H, 13C, 31P NMR).
EN
Acetylene derivatives 4 were synthesized from the corresponding vicinal bromo compounds 2 in the phase-transfer catalyzed hydrogen bromide - beta elimination reaction using solid potassium hydroxide as a base, xylene as a solvent, and a phase-transfer catalyst. The yields of the synthesized acetylene derivatives 4 were substantially improved when water formed in the process had been removed.
EN
Additional cymiazole salts and oxalic, salicylic, citric and boric acids were received. The study aimed at determining the efficacy of controlling Varroa destructor mites with these salts and their toxicity for honey-bees. The most effective were the boric acid salts (efficacy up to 98.1%), salicylic acid (efficacy up to 96.0%) and the mixture of boric acid salt and oxalic acid salt (efficacy up to 98.8%). The honeybee colonies were treated with sugar syrup (1:1) containing about 200 mg of salt per 1 dm³. The acute toxicity of these salts was lower than the toxicity of the initial cymiazole. Values of LD₅₀ of the above salts were higher than 100 mg/bee.
first rewind previous Strona / 1 next fast forward last
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.