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Tytuł:
"Essere" o "avere"? La selezione dell’ausiliare: tra teoria e didattica nell’insegnamento dell’italiano a stranieri
"Essere" or "Avere"? The Selection of Auxiliary: Between Theory and Didactics in the Teaching of Italian L2
Autorzy:
Bozzo, Davide
Powiązania:
https://bibliotekanauki.pl/articles/446503.pdf
Data publikacji:
2018-11-30
Wydawca:
Wydawnictwo Adam Marszałek
Tematy:
Italian auxiliaries
auxiliary selection
Italian compound tenses
Italian L2
verbi ausiliari
selezione dell’ausiliare
tempi composti
italiano L2
Opis:
In the teaching of Italian L2, learners and teachers encounter difficulties when they are faced with the issue of auxiliary selection in the formation of compound tenses. If we analyse the way grammars for foreigners deal with the problem, we notice—between hypertrophic classifications and lists of exceptions—the lack of a model that is able to explain the phenomenon in a systematic and exhaustive manner. Looking at the source, i.e., the Italian L1 grammars, the syntactic model based on the distinction between transitive and intransitive verbs, both in its traditional and non-accusative version, is not suitable for application in L2 teaching, especially in the case of learners from countries where little room during class time is given to metalinguistic reflection. This paper aims to suggest an alternative semantic model that is capable of representing an orientation tool for learners and finding a balance between theoretical and teaching needs, as well as between learning and acquisition. According to our model—which moves the attention from government to diathesis and starts from the meaning of the auxiliaries as autonomous verbs—avere is used when the effects of the action expressed by the verb are directed towards the external world. Meanwhile, essere is used when such effects are directed towards the subject itself, that is, when the syntactic subject of the sentence represents the semantic object of the event, and it therefore assumes the role of the patient, typical of passive and middle diathesis.
Nell’ambito della didattica dell’italiano L2 è nota la difficoltà in cui si imbattono insegnanti e apprendenti quando si trovano ad affrontare la questione dell’alternanza degli ausiliari nella formazione dei tempi composti. Esaminando il modo in cui il problema è trattato nelle grammatiche per stranieri, si nota, tra ipertrofiche classificazioni e teorie di eccezioni, la mancanza di un modello esplicativo capace di dare ragione in maniera organica ed esaustiva del fenomeno. Volgendo lo sguardo alla fonte, ossia alle grammatiche di italiano L1, il modello sintattico fondato sulla distinzione tra verbi transitivi e intransitivi, sia nella sua variante tradizionale sia in quella inaccusativa, risulta ben poco adatto a trovare applicazione nell’ambito della didattica L2, soprattutto nel caso di apprendenti provenienti da paesi nella cui tradizione scolastica si dà poco spazio alla riflessione metalinguistica. Questo contributo si propone di suggerire un modello alternativo di natura semantica capace di rappresentare uno strumento di orientamento per gli apprendenti e di trovare un punto di equilibrio tra esigenze teoriche e didattiche, così come tra apprendimento e acquisizione. Secondo tale modello, che sposta l’attenzione dalla reggenza alla diatesi e muove dal significato degli ausiliari in quanto verbi autonomi, si usa avere quando gli effetti dell’azione espressa dal verbo sono rivolti verso il mondo esterno, essere quando tali effetti sono rivolti verso il soggetto stesso, ossia quando il soggetto sintattico della frase rappresenta l’oggetto semantico dell’evento, assumendo così il ruolo di paziente proprio della diatesi passiva e media.
Źródło:
Italica Wratislaviensia; 2018, 9.2; 55-80
2084-4514
Pojawia się w:
Italica Wratislaviensia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
„Shore to ship” system - an alternative electric power supply in port
Autorzy:
Borkowski, T.
Tarnapowicz, D.
Powiązania:
https://bibliotekanauki.pl/articles/246496.pdf
Data publikacji:
2012
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
alternative marine power
electric shore-side supply
auxiliary diesel engine
exhaust emission
Opis:
Greater interdependence and integration among the countries worldwide have resulted in the growth of the world trade and, what follows, marine transportation. In the last few years, despite the world economic stagnation, the number of ships has increased. An increase in the marine transportation means greater air pollution caused by ships, what is of paramount importance for the port cities. One of the efficient ways of limiting the negative impact of ships lying in ports on the environment is the power supply from the local electricity stations. This will allow for turning marine power generating systems off, what will result in the emission elimination in the ship’s mooring time along with the decrease of noise and vibrations. The infrastructure of the port electric installation necessary for the ships’ supply has to be designed so as to make the operating of different ship types possible. It is complicated as all over the world ships are equipped with different electric systems. The paper deals with general issues related to common nominal voltages and frequencies for vessels which call in European harbours and their estimated power demands. Additionally, a case study of a ferry vessel, currently undergoing retrofitting for shore connections, is presented and some particulars concerning technical solutions and environmental profits are described.
Źródło:
Journal of KONES; 2012, 19, 3; 49-58
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
90 lat tradycji – historia i działalność Korpusu Pomocniczego Pań SWAP w Ameryce
90 years of tradition – history and activity of PAVA Ladies‘ Auxiliary Corps in America
Autorzy:
Maksymowicz, Anitta
Powiązania:
https://bibliotekanauki.pl/articles/449419.pdf
Data publikacji:
2016
Wydawca:
Wyższa Szkoła Ekonomiczno-Humanistyczna w Bielsku-Białej
Tematy:
First World War
Second World War
PAVA Ladies‘ Auxiliary Corps
Polish Army Veterans Association
Blue Army
aid
aid organizations
history of women
nurses
veterans
American Polonia
Polish White Cross
Sokol movement in America
Polska
France
USA
Canada
I wojna światowa
II wojna światowa
Korpus Pomocniczy Pań
Stowarzyszenie Weteranów Armii Polskiej w Ameryce
Błękitna Armia
działalność pomocowa
organizacje pomocowe
historia kobiet
sanitariuszki
weterani
Polonia amerykańska
Polski Biały Krzyż
Sokolstwo w Ameryce
Polska
Francja
Stany Zjednoczone
Kanada
Opis:
1795–1918 Poland was partitioned by three invaders – Prussia (later German Empire), Russia and Austria and didn’t exist on political maps. The outbreak of the World War I woke hope for the rebirth of the Polish state among Poles, including those in the U.S.A. and Canada. During WWI over 20,000 volunteers of Polish origin went from North America to Europe to fight in the Polish Army in France (“Blue Army”) and in Polish-Bolshevik war (1919–1921). After Poland regained its statehood, over 14,000 soldiers re-turned to America. Most of them faced a dramatic situation – wounded, disabled, homeless and without their jobs, they didn’t receive any help from the state, because (according to law) they weren’t the U.S. veterans and therefore had no right to federal health care. Poland, considering them Americans, didn’t support them either. Consequently, the entire responsibility for helping the veterans took numerous Polish organizations in the USA. Some of them – like the Polish Army Veterans Association (PAVA, or in Polish Stowarzyszenie Weteranów Armii Polskiej w Ameryce, SWAP) – were founded just in this respect: to help the veterans. PAVA was established in 1921 in Cleveland, with many branches all around the country. It was a men’s organization whose main function was self-aid. Four years later, the PAVA Ladies’ Auxiliary Corps (Korpus Pomocniczy Pań SWAP), one of the most significant organizations, was created. The article presents the Corps’ activity, under Agnieszka Wisła. The organization has been focused on humanitarian and charity work and has distinguished itself enormously in this endeavor. Their tasks have been among others: caring for the disabled and the sick veterans; organizing help for the homeless and unemployed veterans – i.e. the establishing and maintaining the shelters and nursing homes; visiting the sick veterans in hospitals and nursing homes; raising money by organizing charity balls or exhibitions of their needlework; arranging various entertainment events in order to acquire funds for The Corps’ activities; participating in funerals and caring for the graves of Polish veterans; assisting in organization and taking part in patriotic events (like veterans’ parades, lectures and readings, organizing patriotic trips to Poland); organizing the “Cornflower Days” (Cornflower symbolizes the Blue Army), i.e. – raising funds not only among the Polonia but also among Americans of other origins. At some point of time (mainly in the 40. and in the 50.) there were few thousand members of the Corps working in America, for instance: in 1946 there were 4614 members, and in 1958 as many as 5079 members. Today Auxiliary Corps has about 250 members. Until today the Auxiliary Corps is one of the oldest, strongest and most dynamic Polish women's organizations in America. They have supported thousands of Polish veterans and their families with material as well as moral help for over 90 years now. Their history as well as history of the PAVA is commemorated at the Polish Military Heritage Museum in New York.
W latach 1795–1918 Polska znajdowała się pod zaborami, podzielona między trzy mocarstwa – Prusy (później Cesarstwo Niemieckie), Rosję i Austrię – i nie istniała na politycznych mapach. Wybuch I wojny światowej obudził wśród Polaków, także tych w USA i Kanadzie, nadzieję na odrodzenie się państwa polskiego. Podczas I wojny światowej ponad 20 000 ochotników polskiego pochodzenia wyruszyło z Ameryki Północnej do Europy, aby walczyć w Armii Polskiej we Francji („Błękitnej Armii‖) oraz w wojnie polsko-bolszewickiej (1919–1921). Po odzyskaniu przez Polskę państwowości, ponad 14 000 żołnierzy wróciło do Ameryki. Większość z nich stanęła w obliczu dramatycznej sytuacji – ranni, niepełnosprawni, bezdomni lub bez pracy nie otrzymywali żadnej pomocy od państwa, ponieważ (zgodnie z prawem) nie byli weteranami amerykańskimi i w związku z tym nie mieli prawa do opieki zdrowotnej. Polska, uznając ich za Amerykanów, również się nimi nie zaopiekowała.Całą odpowiedzialność za pomoc weteranom wzięły zatem na siebie liczne polskie organizacje w USA. Niektóre z nich – jak Stowarzyszenie Weteranów Armii Polskiej w Ameryce (SWAP, Polish Army Veterans Association, PAVA) – powstały właśnie w celu pomocy weteranom. SWAP utworzony został w 1921 roku w Cleveland, z wieloma placówkami w całym kraju, jako głównie męska organizacja samopomocowa. Cztery lata później, powołano jego siostrzaną, jedną z najbardziej znaczących organizacji – Korpus Pomocniczy SWAP (PAVA Ladies' Auxiliary Corps). Artykuł poświęcony jest działalności założonego i kierowanego przez Agnieszkę Wisłę Korpusu Pomocniczego. Organizacja koncentrowała się na pracy charytatywnej i humanitarnej na rzecz weteranów, a do głównych jej zadań należało m.in.: dbanie o niepełnosprawnych i chorych weteranów; organizowanie pomocy dla bezdomnych i bezrobotnych poprzez tworzenie i utrzymanie schronisk i domów opieki; odwiedzanie chorych weteranów w szpitalach i domach opieki; zbiórki pieniędzy w ramach bali charytatywnych lub wystaw robótek ręcznych; organizowanie różnego rodzaju imprez rozrywkowych w celu zdobycia środków na działalność Korpusu; uczestnictwo w pogrzebach i opieka nad grobami polskich weteranów; pomoc w organizacji i udział w imprezach patriotycznych (jak parady, wykłady i odczyty, organizacja wycieczek patriotycznych do Polski); organizowanie „Dnia Bławatka" (bławatek jest symbolem Błękitnej Armii), podczas którego prowadzone są kwesty na rzecz polskich weteranów nie tylko wśród Polonii, ale także wśród Amerykanów innego pochodzenia. W pewnym okresie (głównie w latach 40. i 50.) Korpus Pomocniczy liczył kilka tysięcy członkiń, np.: w 1946 roku było 4614 członkiń, a w 1958 aż 5079 członkiń. Obecnie organizacja skupia około 250 pań. Korpus Pomocniczy jest do dziś dnia jedną z najstarszych, największych i najbardziej aktywnych polskich organizacji kobiecych w Ameryce. Przez ponad 90 lat korpusianki wsparły tysiące polskich weteranów i ich rodzin, zarówno w formie materialnej, jak i duchowej. Historia Korpusu Pomocniczego oraz Stowarzyszenia Weteranów Armii Polskiej w Ameryce jest upamiętniona w Muzeum Tradycji i Oręża Polskiego w Nowym Jorku.
Źródło:
Polonia Journal; 2016, 3-4; 113-150
2083-3121
Pojawia się w:
Polonia Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Better Estimator of Population Mean with Power Transformation Based on Ranked Set Sampling
Autorzy:
Mehta (Ranka), Nitu
Mandowara, V. L.
Powiązania:
https://bibliotekanauki.pl/articles/466002.pdf
Data publikacji:
2012
Wydawca:
Główny Urząd Statystyczny
Tematy:
ranked set sampling
ratio estimator
power transformation estimator auxiliary variable
Opis:
Ranked set sampling (RSS) was first suggested by McIntyre (1952) to increase the efficiency of estimate of the population mean. It has been shown that this method is highly beneficial to the estimation based on simple random sampling (SRS). There has been considerable development and many modifications were done on this method. This paper presents a modified ratio estimator using prior value of coefficient of kurtosis of an auxiliary variable x, with the intention to improve the efficiency of ratio estimator in ranked set sampling. The first order approximation to the bias and mean square error (MSE) of the proposed estimator are obtained. A generalized version of the suggested estimator by applying the Power transformation is also presented.
Źródło:
Statistics in Transition new series; 2012, 13, 3; 551-558
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A calibrated synthetic estimator for small area estimation
Autorzy:
Iseh, Matthew Joshua
Enang, Ekaette Inyang
Powiązania:
https://bibliotekanauki.pl/articles/1827531.pdf
Data publikacji:
2021-09-06
Wydawca:
Główny Urząd Statystyczny
Tematy:
auxiliary variable
calibration estimation
simulation
synthetic estimation
Opis:
Synthetic estimators are known to produce estimates of population mean in areas where no sampled data are available, but such estimates are usually highly biased with invalid confidence statements. This paper presents a calibrated synthetic estimator of the population mean which addresses these problematic issues. Two known special cases of this estimator were obtained in the form of combined ratio and combined regression synthetic estimators, using selected tuning parameters under stratified sampling. In result, their biases and variance estimators were derived. The empirical demonstration of the usage involving the proposed calibrated estimators shows that they provide better estimates of the population mean than the existing estimators discussed in this study. In particular, the estimators were examined through simulation under three distributional assumptions, namely the normal, gamma and exponential distributions. The results show that they provide estimates of the mean displaying less relative bias and greater efficiency. Moreover, they prove more consistent than the existing classical synthetic estimator. The further evaluation carried out using the coefficient of variation provides additional confirmation of the calibrated estimator's advantage over the existing ones in relation to small area estimation.
Źródło:
Statistics in Transition new series; 2021, 22, 3; 15-30
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Class of Chain Ratio-Cum-Dual to Ratio Type Estimator with Two Auxiliary Characters Under Double Sampling in Sample Surveys
Autorzy:
Choudhury, S.
Singh, B. K.
Powiązania:
https://bibliotekanauki.pl/articles/465944.pdf
Data publikacji:
2012
Wydawca:
Główny Urząd Statystyczny
Tematy:
auxiliary variate
double sampling
chain ratio-cum-dual to ratio estimator
bias
variance
efficiency
Opis:
This paper considers a chain ratio-cum-dual to ratio type estimator for estimating population mean of the study variate using two auxiliary variates under double (two-phase) sampling procedure, when the information on another additional auxiliary variate is available along with the main auxiliary variate. The asymptotically optimum estimators (AOEs) in the class are identified in two different cases with their bias and variances. The optimum values of the first phase and second phase sample sizes have been obtained for the fixed cost of survey. Theoretical and empirical studies have also been done to demonstrate the efficiency of the proposed estimator with respect to strategies which utilized the information on two auxiliary variates.
Źródło:
Statistics in Transition new series; 2012, 13, 3; 519-536
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Class of Product-Type Exponential Estimators of the Population Mean in Simple Random Sampling Scheme
Autorzy:
Onyeka, A. C.
Powiązania:
https://bibliotekanauki.pl/articles/465727.pdf
Data publikacji:
2013
Wydawca:
Główny Urząd Statystyczny
Tematy:
ratio-type and product-type exponential estimators
auxiliary character
simple random sampling
mean square error
Opis:
The present study proposes a class of product-type exponential estimators for estimating the population mean of the study variable, using known values of some population parameters of an auxiliary character, under the simple random sampling without replacement (SRSWOR) scheme. Furthermore, the study also proposes a modified exponential estimator based on both the ratio-type and the product-type exponential estimators. Properties of the proposed estimators, under the SRSWOR scheme, are obtained up to first order approximation. The modified exponential estimator under optimum conditions is shown to be more efficient than the simple sample mean and the ratio-type and product-type exponential estimators. The theoretical results are supported by an empirical illustration.
Źródło:
Statistics in Transition new series; 2013, 14, 2; 189-200
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Class of Regression Type Estimators in Survey Sampling
Autorzy:
Misra, Govind Charan
Yadav, Subhash Kumar
Shukla, Alok Kumar
Powiązania:
https://bibliotekanauki.pl/articles/465942.pdf
Data publikacji:
2011
Wydawca:
Główny Urząd Statystyczny
Tematy:
Auxiliary variable
Mean Squared Error
Ratio estimator
Regression type estimators
Opis:
A class of linear regression models has been proposed for the estimation of population mean and total when information regarding auxiliary variate is available in survey sampling using regression method of estimation by introducing a new auxiliary variable z, which may also be a function of the auxiliary variable x. The proposed model leads to reduction in mean squared error as compared to ordinary regression method of estimation. The improvement has been demonstrated over ordinary regression estimator and also on ratio estimator with the help of an empirical example.
Źródło:
Statistics in Transition new series; 2011, 12, 3; 579-586
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A comparative study of a class of direct estimators for domain mean with a direct ratio estimator for domain mean using auxiliary character
Autorzy:
Khare, Brij Behari
Ashutosh, Ashutosh
Rai, Piyush Kant
Powiązania:
https://bibliotekanauki.pl/articles/1054559.pdf
Data publikacji:
2021-06-04
Wydawca:
Główny Urząd Statystyczny
Tematy:
domain
auxiliary character
direct ratio estimator
class of estimators
mean square error (MSE)
Opis:
Estimation techniques for a domain parameter play a very significant role in the theory of sample surveys. In the recent years many advanced methodologies have been developed for domain estimation. In particular, direct and synthetic estimators are applied for the estimation of domain mean in the government and private sectors under certain assumptions as to the size of the samples relating to particular domains. The findings demonstrate that the direct estimator fails to perform more efficiently as compared to the synthetic estimator when reliable units are not directly accessible in the studied domains. Moreover, due to the fact that small units belong to the sample of the studied domain, the direct estimator produces an unacceptably large standard error. In contrast, if a sufficient number of units are available in the studied domain, the direct estimator produces effective results. This paper presents the theoretical aspects of the proposed class of direct estimators for domain mean with the use of a single auxiliary character, compared with an existing direct ratio estimator for domain mean (given in section 3.2). In addition, an empirical study has been provided to support the validity of the proposed estimators. The findings prove that the proposed estimators outperform the direct ratio estimator for domain mean using a single auxiliary character in the case of two studied populations and their analysed domains considered from Sarndal et al. (1992).
Źródło:
Statistics in Transition new series; 2021, 22, 2; 189-200
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A digital true random number generator implemented in different Xilinx FPGAs
Cyfrowy generator ciągów losowych zaimplementowany w układach FPGA firmy Xilinx
Autorzy:
Matuszewski, Ł.
Jessa, M.
Powiązania:
https://bibliotekanauki.pl/articles/154959.pdf
Data publikacji:
2013
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
true random number generator
ring oscillator
auxiliary source of randomness
cryptography
field programmable gate array (FPGA)
układy FPGA
generator losowy
oscylator pierścieniowy
kryptografia
Opis:
In cryptography we often require sequences of numbers with unpredictable elements. Such sequences cannot be produced by purely deterministic systems. A novel method for producing true randomness and increasing the randomness of a combined TRNG using ring oscillators is described. In this paper we show that the proposed method provides similar results for generators implemented using different technologies offered by Xilinx. Thus, the proposed generator can be implemented in different FPGAs with other elements of a cryptographic system.
W kryptografii często wymaga się ciągów liczb złożonych z nieprzewidywalnych elementów. Takie sekwencje nie mogą być wytwarzane w systemach czysto deterministycznych. Inżynierowie muszą opracować źródła losowości, których właściwości muszą być ocenione i potwierdzone przez niezależne badania, przynajmniej doświadczalnie. W artykule pokazano, że proponowana metoda wytwarzania losowości jest stabilna pod względem technologicznym. Uzyskano bardzo zbliżone rezultaty dla generatorów losowych zrealizowanych w strukturach FPGA (Field Programmable Gate Array) wykonanych w różnych technologiach jakie oferuje firma Xilinx. W żadnym przypadku nie korzystano z manualnego rozmieszczania elementów w matrycy FPGA, aby uzyskać lepsze rezultaty. Położenie poszczególnych składników zależało tylko od oprogramowania dostarczanego przez producenta. Zatem proponowany generator może być implementowany w różnych układach FPGA razem z innymi elementami systemu kryptograficznego.
Źródło:
Pomiary Automatyka Kontrola; 2013, R. 59, nr 8, 8; 742-744
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A dual inductor-fed boost converter with an auxiliary transformer and voltage doubler
Autorzy:
Dawidziuk, J.
Powiązania:
https://bibliotekanauki.pl/articles/201526.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
DC/DC boost converter
current-fed
dual inductor-fed
auxiliary transformer
voltage doubler
photovoltaic systems
Opis:
This paper presents a dual inductor-fed boost converter with an auxiliary transformer and voltage doubler for sustainable energy power converters. The new topology integrates a two-phase boost converter and a dual inductor-fed boost converter. The energy stored and transferred by both inductors can attain a wide input-voltage and load range which uses a constant switching frequency, by controlling the time duration of the simultaneous conduction of the two switches. Among other current-fed type boost converters the presented topology is attractive due to the high voltage conversion ratio, less stress on the components and less switch conduction loss. To verify the feasibility of this topology, the principles of operation, theoretical analysis, and experimental waveforms are presented for a 1 kW prototype.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 4; 787-791
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A General Class of Mean Estimators Using Mixture of Auxiliary Variables for Two-Phase Sampling in the Presence of Non-Response
Autorzy:
Ahmad, Zahoor
Zubair, Rahma
Shahid, Ummara
Powiązania:
https://bibliotekanauki.pl/articles/465687.pdf
Data publikacji:
2014
Wydawca:
Główny Urząd Statystyczny
Tematy:
non-response
multi-auxiliary variables
regression-cum-ratioexponential
estimators
no information case
Opis:
In this paper we have proposed a general class of estimators for two-phase sampling to estimate the population mean in the case when non-responses occur at the first phase. Furthermore, several continuous and categorical auxiliary variable(s) have been simultaneously used while constructing the class. Also, it is assumed that the information on all auxiliary variables is not available for population, which is often the case. The expressions of the mean square error of the suggested class have been derived and several special cases of the proposed class have been identified. The empirical study has also been conducted.
Źródło:
Statistics in Transition new series; 2014, 15, 4; 501-524
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A General Family of Dual to Ratio-Cum-Product Estimator in Sample Surveys
Autorzy:
Singh, Rajesh
Kumar, Mukesh
Chauhan, Pankaj
Sawan, Nirmala
Smarandache, Florentin
Powiązania:
https://bibliotekanauki.pl/articles/465772.pdf
Data publikacji:
2011
Wydawca:
Główny Urząd Statystyczny
Tematy:
Family of estimators
auxiliary variables
bias
mean-squared error
Opis:
This paper presents a family of dual to ratio-cum-product estimators for the finite population mean. Under simple random sampling without replacement (SRSWOR) scheme, expressions of the bias and mean-squared error (MSE) up to the first order of approximation are derived. We show that the proposed family is more efficient than usual unbiased estimator, ratio estimator, product estimator, Singh estimator (1967), Srivenkataramana (1980) and Bandyopadhyaya estimator (1980) and Singh et al. (2005) estimator. An empirical study is carried out to illustrate the performance of the constructed estimator over others.
Źródło:
Statistics in Transition new series; 2011, 12, 3; 587-594
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A study on relationship of duct leakage and parameters of ducts in Quang Ninh mine
Studium zależności odcieków z rurociągów i parametry rurociągów w Quang Ninh Mine
Autorzy:
Phuong, Thao Dang
Vu, Chi Dang
Powiązania:
https://bibliotekanauki.pl/articles/318793.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
air leakage
auxiliary ventilation
duct
analytic function
working face
rurociągi
funkcja analityczna
wentylacja
Opis:
Air leakage of auxiliary ventilation ducting systems is the most common reason for the insufficient fresh air in the working face in underground mine. This value is important design parameter for mine auxiliary ventilation system that operates more effectively, with lower cost. Therefore, determination of air leakage along auxiliary ventilation ducting systems has been examined. Also, factors which affect air leakage in the ducting system have been investigated. Experimental data are made on 0.7 m and 1 m diameter ducts over sections of ducts installing towards the working face in Quang Ninh mine.
Źródło:
Inżynieria Mineralna; 2019, 21, 2/2; 183-191
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł

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