bluuebunny/crossref_metadata_2025 huggingface dataset:
Kruszenie globalnego Hollywood. System „holdbacks” i sekwencyjność okien dystrybucyjnych a rozwój platform streamingowych
Authors: Adamczak Marcin , Salamon Sławomir
Published: March 2020

Artykuł jest poświęcony przemianom współczesnego amerykańskiego (a więc w istocie światowego) przemysłu filmowego w wyniku rozwoju platform streamingowych i VOD. W tekście zostały zarysowane trzy epoki historii gospodarczej Hollywood: klasyczna, pośrednia lat 60. i 70. oraz globalnego Hollywood. Kres pierwszej położył Paramount Case (Paramount Decree) i jego konsekwencje. Drugą cechowała niestabilność finansowa i brak wyraźnego modelu ekonomicznego. Epoka globalnego Hollywood oraz jej logika opierająca się na sekwencyjności okien dystrybucyjnych jest obecnie kwestionowana przez wyniki działania platform VOD w rodzaju Netfliksa. Wymusza to zarówno reorganizację Hollywood (powołanie własnych platform), jak i zmianę logiki działania studiów (rewizja sekwencyjności okien dystrybucyjnych). W efekcie ostrej konkurencji między platformami może się wyłonić nowy porządek na rynku audiowizualnym. Nawet jeżeli tradycyjne studia hollywoodzkie zachowają dominującą pozycję, to jedynie za cenę gruntownego przekształcenia własnego modelu biznesowego.
Perspektywa produkcyjna w badaniach polskiego filmu dokumentalnego
Authors: Morozow Iwona
Published: March 2020

W literaturze przedmiotu brakuje pogłębionego omówienia specyfiki pracy na planie filmu dokumentalnego, analizy etapów łańcucha produkcyjnego rozpatrywanego zarówno w kontekście społecznym (pracujący/tworzący ludzie, relacje na planie), jak i rynkowym (finansowanie, strategie dystrybucyjne i promocyjne). Autorka, odnosząc się także i do własnych doświadczeń twórczych, próbuje nakreślić właściwe problematyce pole badawcze na podstawie dokumentów branżowych, wybranych baz filmowych oraz tzw. dzienników emocjonalnych, a także wywiadów etnograficznych z twórcami i producentami filmów dokumentalnych. Artykuł wpisuje się w ten sposób w nurt współczesnych badań nad kulturą produkcji filmowej, nawiązuje do problematyki procesu tworzenia i jego kontekstu, zrekonstruowanego za pomocą etnograficznego detalu, którego źródłem są mikrohistorie.
Rynek filmowy jako część systemu masowych rynków medialnych
Authors: Lewicki Arkadiusz
Published: March 2020

Artykuł jest propozycją nowego spojrzenia na pojęcie systemu medialnego. Autor uważa, że dotychczasowe badania nad tradycyjnymi mediami informacyjnymi: prasą, radiem, telewizją i Internetem, powinny być rozszerzone o refleksję nad mediami kreacyjno-rozrywkowymi. Wprowadzono również pojęcie „systemu masowych rynków medialnych”, do których (obok mediów „z istotnym komponentem informacyjnym”) zaliczono takie rynki jak: rynek wydawniczy, rynek filmowy, rynek fonograficzny, rynek wystawienniczy, rynek sztuk performatywnych i eventowy, rynek cyfrowej rozrywki interaktywnej oraz rynek reklamowy. Znaczącą rolę w tym systemie odgrywa rynek filmowy, który ze względów historycznych, genologicznych, ekonomicznych i społecznych jest jednym z istotniejszych elementów współczesnego pejzażu medialnego zdominowanego przez kilka głównych podmiotów.
Warunki chińsko-europejskich koprodukcji filmowych
Authors: Kożuchowski Tomasz
Published: March 2020

Międzynarodowa koprodukcja to coraz powszechniejszy sposób realizacji filmów. Szczególnie popularna jest w Europie, gdzie unijne programy od lat zachęcają kraje członkowskie do współpracy. Rozwój kinematografii narodowych w dużym stopniu zależy od efektywnego poszukiwania nowych źródeł finansowania oraz zdobywania zagranicznych rynków filmowych. Na tym polu toczy się także bój między największymi przemysłami filmowymi świata – hollywoodzkim i chińskim. By pokonać Amerykanów pod względem zysków ze światowej dystrybucji, Chińczycy musieliby zdominować rynki państw trzecich, przede wszystkim europejskie. Walka o widza toczy się na różnych obszarach, a jednym z nich jest koprodukcja, mająca na celu przede wszystkim spopularyzowanie chińskiej kultury, a jednocześnie dająca kinematografiom europejskim możliwość rozwoju i czerpania zysków z chińskiego rynku filmowego.
Współczesny rynek dystrybucji kinowej w Polsce
Authors: Bartosiewicz Aleksandra , Orankiewicz Agnieszka
Published: March 2020

Dystrybutor filmowy jest bardzo ważną figurą w cyklu życia filmu. To on angażuje własne środki w rozpowszechnianie oraz promocję utworu i wraz z producentem podejmuje decyzję o tym, kiedy film ma trafić do kin, w jaki sposób będzie prowadzona kampania marketingowa, a także do kogo będzie adresowana. Jako że rynek dystrybucji kinowej w Polsce jest wciąż słabo rozpoznany przez badaczy akademickich, celem niniejszego artykułu jest uzupełnienie tej luki i przybliżenie czytelnikom specyfiki polskiej branży dystrybucji kinowej. Ponieważ wyniki przeprowadzonego przez autorki badania nad funkcjonowaniem rynku dystrybucji kinowej w Polsce w latach 2002-2018 dostarczają dowodów empirycznych na to, że polska branża filmowa pozostaje pod silnym wpływem dużych amerykańskich firm dystrybucyjnych, w artykule został opisany także wpływ współczesnej branży hollywoodzkiej na rodzimy przemysł filmowy.
Geneza brytyjskiej docusoap i polskiej telenoweli dokumentalnej w kontekście produkcyjno-nadawczym
Authors: Kosińska-Krippner Beata
Published: March 2020

Pod koniec XX w. europejskie publiczne stacje telewizyjne musiały zawalczyć o publiczność z coraz liczniejszymi stacjami komercyjnymi. Rozwiązaniem miały być prawdziwe historie z życia ludzi, które zapożyczały styl i środki dramaturgiczne od seriali fikcyjnych, jak np. docusoap – telewizyjny gatunek hybrydowy łączący właściwości dokumentalizmu obserwacyjnego z cechami opery mydlanej. Realizatorzy docusoap wykorzystali warunki, jakie pojawiły się w produkcji i strukturę ramówki tak, by nowy gatunek dostarczał stacjom jak największej liczby widzów, czyli odpowiednich wskaźników oglądalności i wysokich ocen, od których zależało zainteresowanie reklamodawców kupowaniem czasu antenowego. W europejskich stacjach telewizyjnych nastąpiła moda na docusoap, która nie ominęła także Polski. Autorka opisuje okoliczności powstania, rozkwit oraz kres docusoap w Wielkiej Brytanii i Niemczech oraz telenoweli dokumentalnej w Polsce. Porównuje sytuację produkcyjno-nadawczą, znaczenie i rolę tych gatunków oraz wskazuje narodowe różnice w tym zakresie.
Polska sztuka mediów w rozszerzonym polu
Authors: Kluszczyński Ryszard W.
Published: March 2020

Aleksandra Kaminska w monografii Polish Media Art in an Expanded Field (2016) skupia uwagę na krótkim fragmencie historii sztuki mediów w Polsce, jej pierwszym pięcioleciu po dołączeniu do Unii Europejskiej (2004-2009). Wybór ten wynika z przekonania, że analiza tego przełomowego, zdaniem Kaminskiej, okresu w polskiej sztuce pozwala odpowiedzieć na pytania dotyczące zjawisk i procesów, które autorce wydają się nadzwyczaj ważne. Pytania te koncentrują się w szczególności na negocjacji tożsamości, demokracji, relacji między lokalnością i europejskością. W przekonaniu Kaminskiej twórcy podjęli wówczas trud przedefiniowania koncepcji polskości i jej relacji z różnie definiowanym otoczeniem (zarówno UE, jak i światem). Zasadnicza część książki składa się z pięciu rozdziałów. Autorka omawia w nich historyczne i polityczne konteksty sztuki dyskutowanego okresu, problematykę eksperymentu i historycznych tendencji awangardowych w Polsce, analizuje koncepcje sztuki mediów, obecność i znaczenie problematyki historii oraz pamięci w praktykach artystycznych, związki między sztuką i sferą publiczną, jak również kwestie technologicznej mediatyzacji tożsamości i miejsca.
Nasza mapa filmowa
Authors: Marszałek Rafał
Published: March 2020

Omówienie książki Barbary Hollender Od Munka do Maślony (2017), która jest trzecim ogniwem cyklu po poprzednio wydanych tomach Od Wajdy do Komasy (2014) i Od Kutza do Czekaja (2016). Ciężar gatunkowy tej pracy nie sprowadza się do dokumentacji, a ambicją Hollender nie było stworzenie leksykonu. Jej książka stanowi niebanalną rekonstrukcję biograficzną, która opiera się na świadectwach reżyserów, jednak ostatecznie swój kształt zawdzięcza ich rozmówczyni – autorce. Barbara Hollender opisała przemiany kulturowe, które wpłynęły na kształt dzisiejszego polskiego kina. Wyróżniła kilka punktów granicznych związanych z historią najnowszą, poczynając od polskiej szkoły filmowej, przez kino moralnego niepokoju, które w drugiej połowie lat 70. wyraziło jej – wówczas młodej dziewczyny – własny bunt i osobiste tęsknoty. Ostatnim z tych punktów, szczególnie eksponowanym, jest przemiana ustrojowa po 1989 r. Narracja jest prowadzona ponad podziałami zarówno generacyjnymi, jak i tymi wynikającymi z doświadczenia czy stylu. Bohaterowie książki, nawet jeśli należą do jednego pokolenia, nie tworzą wspólnych manifestów ani nie realizują jednolitego – światopoglądowo czy estetycznie – programu. Portret zbiorowy rozszczepia się na wyraziste, zindywidualizowane wizerunki.
"Lost in translation", czyli co się kryje między słowami pokrytymi patyną historii
Authors: Miller-Klejsa Anna
Published: March 2020

Recenzja książki Agaty Hołobut i Moniki Woźniak Historia na ekranie. Gatunek filmowy a przekład audiowizualny (2018). Autorki badają w niej wpływ filmu historycznego na specyfikę przekładu audiowizualnego, analizując anglojęzyczne (brytyjskie i amerykańskie) listy dialogowe wybranych filmów fabularnych i seriali historycznych oraz ich dostępne polskie oraz włoskie przekłady (opracowania dubbingowe, lektorskie i napisowe). Recenzentka zwraca uwagę, że książka udatnie łączy narzędzia analizy językoznawczej, filmoznawczej i stylometrycznej.
Polskiego filmu oświatowego dzieje nieznane
Authors: Guzek Mariusz
Published: March 2020

Historia Wytwórni Filmów Oświatowych liczy sobie tyle lat, ile powojenne dzieje polskiej kinematografii. Książka Elementarz Wytwórni Filmów Oświatowych (2018) Michała Dondzika, Krzysztofa Jajki i Emila Sowińskiego, oparta na imponującym materiale dokumentarnym, uwzględnia tę perspektywę, ale stanowi również kolejną pozycję w katalogu filmoznawczych opracowań poświęconych Łodzi – najważniejszemu filmowemu miastu w Polsce. Kilkadziesiąt lat WFO to też kilkadziesiąt karier reżyserskich, eksperymentowanie z gatunkowymi wariantami filmu oświatowego, rywalizacja na zmieniającym się rynku usług audiowizualnych. To także postawione na końcu liczącej ponad 400 stron monografii pytanie: co dalej? Elementarz Wytwórni Filmów Oświatowych, pomimo że jest debiutem książkowym autorów, jest jedną z najważniejszych pozycji filmoznawczych wydanych w ostatnich miesiącach.
Kesesuaian rencana pembangunan kampus PDD-PSDKU IPB Sukabumi dengan Rencana Tata Ruang Wilayah (RTRW) Kota Sukabumi
Authors: Mursalin Mursalin , Prayoga Gatot , Permadi Tri
Published: March 2020

Program studi di luar domisili (PDD)–program studi di luar kampus utama (PSDKU) adalah program yang diinisiasi dan difasilitasi oleh Pemerintah Provinsi Jawa Barat bekerja sama dengan IPB yang direncanakan berlokasi di Kota Sukabumi. Tujuannya untuk pemerataan akses pendidikan, peningkatan kapasitas sumber daya manusia, serta pengembangan ilmu pengetahuan dan teknologi di Jawa Barat. Berdasarkan regulasi yang berlaku, rencana pembangunan ini wajib memiliki AMDAL, yang dalam prosesnya wajib mematuhi kesesuaian terhadap rencana tata ruang wilayah (RTRW) kawasan tersebut. Hal itu juga termasuk ke dalam skema penilaian dokumen AMDAL pada uji tahap proyek. Tulisan ini hendak mengkaji bagaimana kesesuaian program pembangunan kampus terhadap RTRW yang ada. Gedung kampus direncanakan dibangun di Kelurahan Babakan, Kecamatan Cibeureum, Kota Sukabumi. Kajian berlangsung pada tahun 2018, dengan melakukan tumpang susun (overlay) menggunakan software ArcGIS versi 10.4.1 antara titik koordinat lokasi rencana pembangunan dengan RTRW Kota Sukabumi periode tahun 2011-2031. Hasil overlay menunjukkan bahwa lokasi rencana pembangunan adalah sesuai berdasarkan tiga poin yang diatur yakni rencana struktur ruang, rencana pola ruang dan rencana penetapan kawasan strategis Kota Sukabumi. Program rencana pembangunan PDD-PSDKU IPB Sukabumi sangat sesuai dengan peruntukan ruang yang diatur, yakni berada di dalam kawasan pendidikan dan pembangunan sarana pendidikan.
Effect of teacher’s performance in the implementation of environmental education to the student’s active participation in maintaining environmental sustainability
Authors: Kristalinawati Kristalinawati , Utomo Suyud Warno , Susilo Tri Edhi Budhi
Published: March 2020

Environmental education (EE) has begun in Indonesia since 1970, however the environmental damages that come from human behaviour are still going on and even increasing. This may imply that the results of environmental education have not been seen. Performance of teachers as educators and learning designers need to be evaluated. The research was conducted at Gonzaga High School in Jakarta and Loyola High School in Semarang with a quantitative approach and qualitative data as supporters. The method used was survey, with questionnaires technique and in-depth interviews. The results show that the active participation of the students in terms of protecting the environment is very low. It means the effectiveness of environmental education in terms of this side is not effective. Performance of teachers as educators and learning designers in the implementation of EE affects the active participation of students in terms of conserving the environment. Training for teachers in making learning instrument needs to be done regarding the conduct of learning related EE more effective.
Efektivitas pengolahan limbah cair industri penyamakan kulit Sukaregang Garut dengan adsorben karbon aktif dan ijuk
Authors: Fachria Rizqy , Ramdan H , Aryantha INP
Published: March 2020

Penyamakan kulit termasuk dalam industri andalan Indonesia. Salah satu wilayah yang menghasilkan bahan kulit berkualitas adalah Sukaregang, Garut. Industri ini memiliki dampak positif dan negatif. Limbah cair dari penyamakan kulit mencemari lingkungan dan menurunkan kualitas kesehatan masyarakat. Oleh karena itu, pengusaha harus memiliki teknologi pengolahan mandiri. Salah satu metode pengolahan yang dapat diterapkan adalah metode adsorpsi. Tujuan dari penelitian ini adalah mengukur efektivitas pengolahan limbah cair penyamakan kulit dengan metode adsorpsi. Penelitian dilakukan dalam dua tahap, yaitu penelitian pendahuluan untuk menentukan adsorben dan penelitian lanjutan untuk mengukur efektivitas pengolahan. Lokasi penelitian adalah pabrik Kamila Leather di Sukaregang Garut. Penilaian berdasarkan parameter baku mutu dalam PerMenLH Nomor 5 Tahun 2014 tentang Baku Mutu Air Limbah. Hasilnya, melalui metode adsorpsi dengan adsorben arang aktif dan ijuk dapat menurunkan 72,13% TSS, 76,58% BOD dan 76,49% COD.
Who Are the Gentrifiers and How Do They Change Central City Neighbourhoods? Privatization, Commodification, and Gentrification in Bucharest
Authors: Chelcea Liviu , Popescu Raluca , Cristea Darie
Published: March 2020

Our understanding of gentrification outside of the Anglo-Saxon core is relatively undeveloped. In order to contribute to a more de-centered approach, we ask who are the gentrifiers and how do they change central city neighbourhoods in a post-socialist context? The answers are explored through a mixed-methods approach, using both quantitative and qualitative data: construction permits analysis, census tract data, field trips, and interviews with tenants, former owners, and real estate agents. Findings indicate that gentrifiers vary in nature. They include state tenants, former owners, marginal gentrifiers, political capitalists, and institutional investors. Through their actions, central neighbourhoods have gained younger, more educated, and smaller households. Beyond this case study, we emphasize the usefulness of rent gap theories, the need to study displaced households, and the potential of property rights to enrich theories of gentrification.
New-build gentrification in the post-socialist city: Łódź and Leipzig two decades after socialism
Authors: Holm Andrej , Marcińczak Szymon , Ogrodowczyk Agnieszka
Published: March 2020

This contribution focuses on the role of new-build gentrification in the socio-spatial re-differentiation of shrinking second-tier post-socialist cities in Germany and Poland, countries that differ in terms of the pace and character of post-socialist transition. Our main goal is to compare and contrast the unfolding of new-build gentrification in different post-socialist settings with the examples of new-build gentrification known from international studies that mostly cover “Western” cities. One of the main findings of our study is that the tempo and scale of new-build gentrification is sensitive to the pace of post-socialist transformations and to institutional contexts. Regarding the international debate on newbuild gentrification, our findings from Łódź and Leipzig highlight a rather distinctive mode of the process. Despite the undeniable similarities with the spatial patterns detected by previous studies illustrating the “Western” contexts, the new-build gentrification detected in our case cities points to different economic roots as well as specific social consequences. Irrespective of identified differences between Leipzig and Łódź, the new-build gentrification appears to be economically independent from the former (other) forms of gentrification and its dynamics.
Studentification in the postsocialist context: The case of Cracow and the Tri-City (Gdansk, Gdynia and Sopot)
Authors: Murzyn-Kupisz Monika , Szmytkowska Magdalena
Published: March 2020

For over a decade, the term studentification has been used to denote the process of urban changes linked with the presence of student populations in urban centres. This text broadens the geographic scope of research into studentification using two Polish metropolitan areas as case studies, analysing and comparing research results to existing findings referring to Western European and Anglo-Saxon settings. Using the example of Cracow and the Tri-City (Trójmiasto), two significant centres of higher education in Poland, the paper presents empirical evidence indicating that while some aspects of students’ impact on Polish cities are similar to trends observed in Western Europe and non-European Anglo-Saxon countries, the colonisation of Polish cities by students nonetheless displays some unique features strongly influenced by the post-socialist context in which such cities and their student populations function.
Between gentrification and reurbanisation: The participatory dimension of bottom-up regeneration in Gdańsk, Poland
Authors: Grabkowska Maja
Published: March 2020

Urban regeneration has become a key issue in the development of contemporary cities. The paper discusses bottom-up regeneration practices performed by inhabitants of a decaying inner-city neighbourhood under post-socialist conditions, which differ notably from the widely researched Western European context. Results of a qualitative study in Wrzeszcz Dolny, Gdańsk, have indicated the leading role of newcomers to the area in animating bottom-up regeneration efforts, which in turn translate into an activation and integration of the local community. Thus, it is argued that an in-migration into the inner city, usually interpreted as gentrification, does not necessarily generate losses for the indigenous inhabitants but can also bring a desired social change and significantly contribute to the building of inclusive civil society. The presented case study therefore signals the need for a careful investigation and precise labelling of the post-socialist inner-city transformation processes, as well as demonstrates how increasing participation might be employed as the potential antidote to ills associated with gentrification.
Beyond gentrification: Diversified neighbourhood upgrading in the inner city of Budapest
Authors: Kovács Zoltán , Wiessner Reinhard , Zischner Romy
Published: March 2020

The concept of gentrification has been extensively used in post-socialist context in association with neighbourhood renewal processes, despite the exact meaning of the term and its social effects not always being sufficiently clarified. This paper builds upon empirical research from downtown Budapest. Our investigation primarily focused on the interplay of three groups of stakeholders involved in urban renewal: politicians, investors and residents. On the basis of our multi-dimensional analysis, we could identify three main types of upgrading: classical gentrification (with two sub-types), as well as incumbent upgrading and soft forms of revitalisation. In the studied neighbourhoods, a mixture of these forms of upgrading could be identified, reflecting a diversified rejuvenation. Gentrification was spatially limited to poverty ridden neighbourhoods subject to local government organised regeneration programmes. The predominance of soft forms of revitalisation is a function of housing market mechanisms as well as the planning control of local districts, which in general together create a healthy social mix despite pervasive regeneration activities.
Patterns and Drivers of Inner City Social Differentiation in Prague and Tallinn
Authors: Kährik Anneli , Novák Jakub , Temelová Jana , Kadarik Kati , Tammaru Tiit
Published: March 2020

During the socialist era, inner residential areas of Eastern European cities were left to decay both physically and socially, and became mostly occupied by elderly inhabitants. Drawing on 2007–2011 EU-SILC data, we have analysed processes of socio-spatial differentiation in the inner cities of Prague and Tallinn during the post-socialist era, and indicate the household-level drivers of such differentiation. We found a high preference for inner city living among young people and childless households, but also the persisting patterns of elderly population in some inner city sub-areas. A weak correlation between household socio-economic status and place of residence in the inner city, however, suggests that inner cities continued to be socially mixed in the late 2000s, although differences existed in this regard between sub-areas and between the two studied cities. To a large extent, such differentiation relates to the roots found within socialist and pre-socialist legacies, but it also contains new post-socialist features, such as those created by different social and housing policies applied during the post-socialist reforms.
The problem of extreme decomposition of the plane
Authors: Bakhtin Aleksandr , Dvorak Inna
Published: March 2020

Considered here is one quite general problem about the description of extremal configurations maximizing the product of inner radii
mutually non-overlapping domains the next following form: \begin{equation} J_{n}(\gamma)=\left[r\left(B_0,0\right)r\left(B_\infty,\infty\right)\right]^{\gamma}\prod\limits_{k=1}^n r\left(B_k,a_k\right),\end{equation} where $\gamma\in\mathbb{R^{+}}$,
$A_{n}=\{a_{k}\}_{k=1}^{n}$ -- $n$-radial points system, $B_0$, $B_\infty$, $\{B_{k}\}_{k=1}^{n}$ -- set of systems of mutually disjoint domains, \textup{(}$a_{0}=0\in B_0\subset{\mathbb{C}}$, $\infty\in B_\infty\subset\overline{\mathbb{C}}$, $a_k\in
B_k\subset{\mathbb{C}}$\textup{)}, achieved for some configuration of domains $B_{0}$, $B_{k}$, $B_{\infty}$ and points $a_{0}$, $a_{k}$, $\infty$, $k=\overline{1, n}$. The functional (1) evaluation for the first time was obtained in 1988 by V.M. Dubinin \cite{4} for {$\gamma=\frac{1}{2}$ и $n\geqslant2$} for systems of disjoint domains using symmetrization method. A special case, when domains are univalent, was examined by G.V. Kuzmina in \cite{KYZMINA-01} After the result of V.M. Dubinin in the general formulation for the arbitrary multiply-concted domains was not until 2017. In 2017 in the work of I. Dengi, A. Targonsky \cite{iratarg} was the result for $\gamma_{n}=0.08n^{2}$, $n\geq7$. The result was obtained through a lower bound of $min_t (n-1)x_{1}+x_{2},$ where $x_{1}(t)+x_{2}(t)$ is the equation $F^\prime (x)=t$ solution, $F^\prime (x)=4x\ln(x)-2(x-1)\ln|x-1|-2(x+1)\ln(x+1)+\frac{2}{x}, $ $y_0 \leqslant t<0$, $y_{0}\approx-1,0599$. In this paper, a much better estimate of $min_t (n-1)x_{1}+x_{2}$ was obtained through a lower bound with the specified parameters. On the basis of this, the article succeeded in obtaining an estimate of the maximum of the functional (1) over a larger interval of the parameter $\gamma$, $\gamma\in(0,\gamma_{n}]$, $n\geq7$. Received the result for for any points of the circle $|a_k|=R$, $k=\overline{1,n}$, and any pairwise disjoint systems of domains $B_k$, $a_{0}=0\in B_0\subset{\mathbb{C}}$, $\infty\in
B_\infty\subset\overline{\mathbb{C}}$, $a_k\in B_k\subset{\mathbb{C}}$, $k=\overline{1,n}.$
On local behavior of one class of inverse mappings
Authors: Sevost'yanov Evgeny , Skvortsov Sergei
Published: March 2020

As is known, the local behavior of maps is one of the most important problems of analysis. This, in particular, relates to the study of mappings with bounded and finite distortion, which have been actively studied recently. As for this work, here we solve the problem of the behavior of maps, the inverse of which satisfies the Poletsky inequality. The main result is the statement about the equicontinuity of the indicated mappings inside the domain in the case when the majorant corresponding to the distortion of the module under the mapping is integrable in the original domain. It should be emphasized that the proof of this result is largely geometric, at the same time, it uses only the conditions of boundedness of the direct and mapped domains and does not involve any requirements on their boundaries. The study of families of mappings inverse to a given class may turn out to be trivial if we are talking about quasiconformal mappings. In the latter case, we do not go beyond the limits of the class under study in the transition to inverse maps. Nevertheless, when studying mappings with unbounded characteristic, this question is quite substantial, as simple examples of the corresponding classes show. The idea of the proof of the main result is based on the fact that the inner points of an arbitrary domain are weakly flat. The last statement can be called the Väisälä lemma, which was established in his monograph and related to families of curves joining two continua between the plates of a spherical condenser. The proof is also based on the fact that the module of families of curves joining two converging continua in a good domain must tend to infinity. In this case, the neighborhood of some inner point of the mapped domain serves as ''good'' region, in which we check the equicontinuity of the inverse family of maps. The results of this article are applicable to many other classes of mappings such as mappings with a finite distortion in the sense of Iwaniec, Sobolev classes on the plane and in space, and so on.
Hypercomplex method for solving linear PDEs
Authors: Shpakivskyi Vitalii
Published: March 2020

Algebraic-analytic approach to constructing solutions for given partial differential equations were investigated in many papers. In particular, in papers [1-14]. It involves solving two problems. Problem (P 1) is to describe all the sets of vectors \( e_1, e_2, \ldots, e_d \), which satisfy the characteristic equation (or specify the procedure by which they can be found). And the problem (P 2) is to describe all the components of monogenic (i.e., continuous and differentiable in sense Gateaux) functions. In particular, for the equation (4) we must describe the components of the function \( \Phi(\zeta) = \exp \zeta \). Note that in the papers [15, 16] a constructive description of all analytic functions with values is obtained in an arbitrary finite-dimensional commutative associative algebra over the field \(\mathbb{C}\). The Theorem 5.1 of the paper [17] states that it is enough to limit the study of monogenic functions in algebras with the basis of \( \{1, \eta_1, \eta_2, \ldots, \eta_{n-1} \} \), where \( \eta_1, \eta_2, \ldots, \eta_{n-1} \) are nilpotents. In addition, in [18] it is showed that in each algebra with a basis of the form \( \{1, \eta_1, \eta_2, \ldots, \eta_{n-1} \} \) the equation (3) has solutions. That is, the problems (P 1) and (P 2) are completely solved on the classes of commutative associative algebras with the basis \( \{1, \eta_1, \eta_2, \ldots, \eta_{n-1}\} \). It is worth noting that in a finite-dimensional algebra a decomposition of monogenic functions has a finite number of components, and therefore, it generates a finite number of solutions of a given partial differential equations. In this paper, we propose a procedure for constructing an infinite number of families of solutions of given linear differential equations with partial derivatives with constant coefficients. We use monogenic functions that are defined on some sequences of commutative associative algebras over the field of complex numbers. To achieve this goal, we first study the solutions of the so-called characteristic equation on a given sequence of algebras. Further, we investigate monogenic functions on the sequence of algebras and study their relation with solutions of partial deferential equations. The proposed method is used to construct solutions of some equations of mathematical physics. In particular, for the three-dimensional Laplace equation and the wave equation, for the equation of transverse oscillations of the elastic rod and the conjugate equation, a generalized biharmonic equation and the two-dimensional Helmholtz equation. We note that this method yields all analytic solutions of the two-dimensional Laplace equation and the two-dimensional biharmonic equation (Goursat formula).
Estimation of oscillation velocities of oscillator network
Authors: Shcherbak Volodymyr , Dmytryshyn Iryna
Published: March 2020

The study of the collective behavior of multiscale dynamic processes is currently one of the most urgent problems of nonlinear dynamics. Such systems arise on modelling of many cyclical biological or physical processes. It is of fundamental importance for understanding the basic laws of synchronous dynamics of distributed active subsystems with oscillations, such as neural ensembles, biomechanical models of cardiac or locomotor activity, models of turbulent media, etc. Since the nonlinear oscillations that are observed in such systems have a stable limit cycle , which does not depend on the initial conditions, then a system of interconnected nonlinear oscillators is usually used as a model of multiscale processes. The equations of Lienar type are often used as the main dynamic model of each of these oscillators. In a number of practical control problems of such interconnected oscillators it is necessary to determine the oscillation velocities by known data. This problem is considered as observation problem for nonlinear dynamical system. A new method – a synthesis of invariant relations is used to design a nonlinear observer. The method allows us to represent unknowns as a function of known quantities. The scheme of the construction of invariant relations consists in the expansion of the original dynamical system by equations of some controlled subsystem (integrator). Control in the additional system is used for the synthesis of some relations that are invariant for the extended system and have the attraction property for all of its trajectories. Such relations are considered in observation problems as additional equations for unknown state vector of initial oscillators ensemble. To design the observer, first we introduce a observer for unique oscillator of Lienar type and prove its exponential convergence. This observer is then extended on several coupled Lienar type oscillators. The performance of the proposed method is investigated by numerical simulations.
The problem of extreme decomposition of a complex plane with fixed poles on a circle
Authors: Vyhivska Liudmyla
Published: March 2020

The problem of extreme decomposition of a complex plane with fixed poles on a circle. Investigation on geometric function theory has been conducted by several researchers, however, few studies have reported on the problem considering extremal configurations the product of inner radii of non-overlapping domains with respect to fixed poles. The paper describes the problem of finding the maximum of the product of inner radii of mutually non-overlapping symmetric domains with respect to points on a unit circle multiply by a certain positive degree \(\gamma\) of the inner radius of the domain with respect to the zero. The problem was studied using the method of separating transformation. Proving the theorem shows that the maximum is obtained if \(\gamma\in(1,n^2]\) and for all \(n\geqslant 2\). Its results and the method for the obtaining of these results can be used in the theory of potential, approximations, holomorphic dynamics, estimation of the distortion problems in conformal mapping, and complex analysis.
Monogenic functions in two dimensional commutative algebras to equations of plane orthotropy
Authors: Gryshchuk Serhii
Published: March 2020

Among all two-dimensional commutative and assosiative algebras of the second rank with the unity \(e\) over the field of complex numbers \(\mathbb{C}\) we find a semi-simple algebra \(\mathbb{B}_{0} := \{c_1 e+c_2 \omega: c_k\in\mathbb{C}, k=1,2\}\), \(\omega^2=e\), containing a basis \((e_1,e_2)\), such that \( e_1^4 + 2p e_1^2 e_2^2 + e_2^4 = 0 \) for any fixed \( p \) such that \(-1 \lt p \gt 1 \). A domain \(\mathcal{B}_{1}=\{(e_1,e_2)\}\), \(e_1=e\), is discribed in an explicit form. We consider an approach of \(\mathbb{B}_{0}\)-valued ''analytic'' functions \(\Phi(xe_1+ye_2) = U_{1}(x,y)e_1 + U_{2}(x,y)ie_1+ U_{3}(x,y)e_2 + U_{4}(x,y)ie_2\) (\((e_1,e_2)\in \mathcal{B}\), \(x\) and \(y\) are real variables) such that their real-valued components \(U_{k}\), \(k=\overline{1,4}\), satisfy the equation on finding the stress function \(u\) in the case of orthotropic plane deformations (with absence of body forses): \( \left(\frac{\partial^4}{\partial x^4} +2p\frac{\partial^4 }{\partial x^2\partial y^2}+ \frac{\partial^4 }{\partial y^4} \right) u(x,y)=0\) for every \((x,y)\in D\), where \(D\) is a domain of the Cartesian plane \(xOy\). A characterization of solutions \(u\) for this equation in a bounded simply-connected domain via real components \(U_{k}\), \(k=\overline{1,4}\), of the function \(\Phi\) is done in the following sense: let \(D\) be a bounded and simply-connected domain, a solution \(u\) is fixed, then \(u\) is a first component of monogenic function \(\Phi_{u}\). The variety of such \(\Phi_{u}\) is found in a complete form. We consider a particular case of \((e,e_2)\in \mathcal{B}_{1}\) for which \(\Phi_{u}\) can be found in an explicit form. For this case a function \(\Phi_{u}\) is obtained in an explicit form. Note, that in case of orthotropic plane deformations, when Eqs. of the stress function is of the form: \( \left(\frac{\partial^4}{\partial x^4} +2p\frac{\partial^4}{\partial x^2\partial y^2}+\frac{\partial^4 } {\partial y^4} \right) u(x,y)=0\), here \(p\) is a fixed number such that \(p>1\), a similar research is done in [Gryshchuk S. V. Сommutative сomplex algebras of the second rank with unity and some cases of plane orthotropy. I. Ukr. Mat. Zh. 2018. 70, No. 8. pp. 1058-1071 (Ukrainian); Gryshchuk S. V. Сommutative сomplex algebras of the second rank with unity and some cases of plane orthotropy. II. Ukr. Mat. Zh. 2018. 70, No. 10. pp. 1382-1389 (Ukrainian)].
Dirichlet problem for Poisson equations in Jordan domains
Authors: Gutlyanskii Vladimir , Ryazanov Vladimir , Yakubov Eduard
Published: March 2020

First, we study the Dirichlet problem for the Poisson equations \(\triangle u(z) = g(z)\) with \(g\in L^p\), \(p>1\), and continuous boundary data \(\varphi :\partial D\to\mathbb{R}\) in arbitrary Jordan domains \(D\) in \(\mathbb{C}\) and prove the existence of continuous solutions \(u\) of the problem in the class \(W^{2,p}_{\rm loc}\). Moreover, \(u\in W^{1,q}_{\rm loc}\) for some \(q>2\) and \(u\) is locally Hölder continuous. Furthermore, \(u\in C^{1,\alpha}_{\rm loc}\) with \(\alpha = (p-2)/p\) if \(p>2\). Then, on this basis and applying the Leray-Schauder approach, we obtain the similar results for the Dirichlet problem with continuous data in arbitrary Jordan domains to the quasilinear Poisson equations of the form \(\triangle u(z) = h(z)\cdot f(u(z))\) with the same assumptions on \(h\) as for \(g\) above and continuous functions \(f:\mathbb{R}\to\mathbb{R}\), either bounded or with nondecreasing \(|f\,|\) of \( |t\,|\) such that \(f(t)/t \to 0\) as \(t\to\infty\). We also give here applications to mathematical physics that are relevant to problems of diffusion with absorbtion, plasma and combustion. In addition, we consider the Dirichlet problem for the Poisson equations in the unit disk \(\mathbb{D}\subset\mathbb{C}\) with arbitrary boundary data \(\varphi :\partial\mathbb{D}\to\mathbb{R}\) that are measurable with respect to logarithmic capacity. Here we establish the existence of continuous nonclassical solutions \(u\) of the problem in terms of the angular limits in \(\mathbb D\) a.e. on \(\partial\mathbb D\) with respect to logarithmic capacity with the same local properties as above. Finally, we extend these results to almost smooth Jordan domains with qusihyperbolic boundary condition by Gehring-Martio.
Some estimates for extremal decomposition of the complex plane
Authors: Denega Iryna
Published: March 2020

In geometric function theory of complex variable extremal problems on non-overlapping domains are well-known classic direction. A lot of such problems are reduced to determination of the maximum of product of inner radii on the system of non-overlapping domains satisfying a certain conditions. In this paper, we consider the well-known problem of maximum of the functional \(r^\gamma\left(B_0,0\right)\prod\limits_{k=1}^n r\left(B_k,a_k\right)\), where \(B_{0}\),..., \(B_{n}\) are pairwise disjoint domains in \(\overline{\mathbb{C}}\), \( a_0=0 \), \(|a_{k}|=1\), \(k=\overline{1,n}\) are different points of the circle, \(\gamma\in (0, n]\), and \(r(B,a)\) is the inner radius of the domain \(B\subset\overline{\mathbb{C}}\) relative to the point \( a \). This problem was posed as an open problem in the Dubinin paper in 1994. Till now, this problem has not been solved, though some partial solutions are available. In the paper an estimate for the inner radius of the domain that contains the point zero is found. The main result of the paper generalizes the analogous results of [1, 2] to the case of an arbitrary arrangement of systems of points on \(\overline{\mathbb{C}}\).
Nonlinear anharmonic disturbances of elastic surface Love waves under rigid fixation of the waveguide
Authors: Zhogoleva Nadiya
Published: March 2020

The model of geometrically and physically nonlinear deformation of anisotropic elastic medium is used in this work. A theoretical numerical-analytic solution of the boundary value problem of determining nonlinear anharmonic disturbances that are generated because of generalised Love wave propagation in a waveguide in the form of a single-crystal layer of the m3m class of a cubic system on the half-space of a single-crystal material of m3m class of a cubic system is constructed. The elastic layer on the top edge is rigidly fixed and on the bottom edge has ideal mechanical contact with the elastic halfspace. Numerical investigations have been carried out for a combination of waveguide materials: a layer of sodium chloride on the silicon half-space. Amplitude-frequency dependences for kinematic characteristics of elastic wave displacements of Love waves and their nonlinear second harmonics are researched and generalized.
Synchronization of oscillations for coupled Van der Pol oscillators by output
Authors: Zhogoleva Nadiya , Shcherbak Volodymyr
Published: March 2020

A number of automatic control tasks, in particular, the synchronization of trajectories, the tracking task, control by a reference system are associated with the synthesis of control algorithms for dynamic cascade systems, which are a set of interconnected active subsystems. In this paper, the oscillation synchronization problem is considered for two Van der Pol coupled oscillators. It is assumed that the driven subsystem depends on the external control action, in addition, the phase vector is not fully known. On the first step the solution of the problem of synchronization in the form of state feedback is written. The aim of the work is to find the synchronizing control in the form of feedback on the state estimation. Such a formulation is relevant, since for many practical applications of control theory, a typical situation is when the complete state vector of the system is unknown and only some of the functions of the state variables - the outputs of the system are accessible to measurement. One can try to use the control law obtained from feedback by replacing the state with its estimate obtained by observer - a special dynamical system whose state eventually approaches (asymptotically or exponentially) to the state of the original system. In this case a question arises whether such control will be solving the synchronization problem. In mathematical control theory, in particular for the stabilization problem of dynamical systems, similar questions constitute the content of the known principle of separation. For the observation problem solving the apparatus of the method of synthesis of auxiliary invariant relations for constructing a nonlinear observer was used. In accordance with this approach a nonlinear observer is constructed for the system under consideration, which ensures the exponential estimates of the phase vector. It is further shown that the use in the control law instead of the state of the system of its evaluation under simultaneously solving the problems of observation and synchronization leads to the local solution of the problem under consideration.
On the simplification of a frequency equation of the natural axially symmetric oscillations of a perfect liquid in a rigid cylindrical reservoir with elastic base
Authors: Kononov Yuri , Dzhukha Yuri
Published: March 2020

We have simplified the previously received frequency equation of the natural axially symmetric oscillations of a heavy perfect incompressible liquid in a rigid cylindrical reservoir with elastic bases in the form of thin circular plates. The singularity in the frequency equation in the case of the coincidence of mass characteristics of the plates was removed. We have considered arbitrary methods of fixing the contours of the plates and different limiting cases: the degeneration of plates into membranes, absolutely rigid plates, the absence of upper plate (free surface on the liquid), and the case of zero gravity. It has been shown that the frequency spectrum of the coupled axially symmetric oscillations of elastic bases and the ideal liquid consists of two sets of frequencies, corresponding to oscillations of the upper and lower elastic bases, and additional oscillation frequency of a liquid column as a whole.
Nonlinear boundary value problems for nondegenerate differential-algebraic systems
Authors: Nesmelova Olga
Published: March 2020

The article proposes original solvability conditions and the scheme for finding solutions of the nonlinear Noetherian differential-algebraic boundary value problem. And we use the matrix pseudo-inversion technique of Moore-Penrose. The posed problem in the article continues the study of conditions of solvability and schemes for finding solutions of the nonlinear Noetherian boundary-value problems given in the monographs by A. Poincare, A.M. Lyapunov, I.G. Malkin, J. Hale, Yu.A. Ryabov, A.M. Samoylenko, N.V. Azbelev, V.P. Maksimov, L.F. Rakhmatullina and A.A. Boychuk. We studied a general case, when a linear bounded operator corresponding to the homogeneous part of the linear Noetherian differential-algebraic boundary value problem has no inverse. Sufficient conditions for reducibility of the differential algebraic equation to the system uniting a differential and algebraic equation are found. Thus, the differential-algebraic boundary value problem is reduced to the nonlinear Noetherian boundary value problem for the system of ordinary differential equations. We studied the case of the presence of simple roots of the equation for generating amplitudes. Constructive necessary and sufficient conditions of existence were obtained to find solutions to the problem in the critical case, and the converging iterative scheme was constructed. The proposed solvability conditions, and the scheme for finding solutions of the nonlinear Noetherian differential-algebraic boundary value problem are illustrated in detail by the example from the nonlinear Noetherian differential-algebraic boundary value problem for Duffing type equations. For control of the rate of the iterative scheme convergence to the exact solution of the differential-algebraic boundary value problem for the Duffing type equation, we used the residuals of the obtained approximations in the Duffing type equation in the space of continuous functions.
Influencia terapéutica en la evolución de la otitis media aguda
Authors: Ruano de Pablo Laura , Vargas Salamanca Eileen , Caro García Manuel Ángel , Pérez Heras Íñigo
Published: March 2020

Introducción: La otitis media aguda (OMA) es una de las infecciones más comunes y primera causa de administración de antibioterapia en la infancia. En ocasiones pueden tener una evolución tórpida y dar lugar a complicaciones, siendo la mastoiditis aguda la más frecuente. Según algunos estudios se está produciendo un aumento en la incidencia de esta patología y de su gravedad, sin saberse claramente su causa.

Métodos: Se realiza un estudio retrospectivo de pacientes ingresados en el Hospital Virgen de la Salud de Toledo, durante un periodo de 64 meses, de 2012 a 2017. Los criterios de inclusión fueron pacientes que fueron diagnosticados de mastoiditis aguda y/o complicaciones derivadas de ésta.

Resultados: Se identificaron un total de 22 pacientes con mastoiditis aguda, correspondiendo a una media anual de 4,125 casos/año. El 63,63% de los casos tenían entre 0-2 años. Sólo el 50% de los casos recibieron antibioterapia oral previo al ingreso hospitalario. Se aisló el germen en el 60% de los casos, siendo el S. pneumoniae el causante más frecuente. Se detectaron un total de 4 casos de mastoiditis complicada suponiendo el 18,18% de los pacientes; todos fueron varones, y ninguno tenía supuración espontánea a su llegada a Urgencias.

Conclusiones: El uso de antibioterapia oral para el tratamiento de la OMA no ha demostrado que disminuya la incidencia de mastoiditis aguda; sin embargo, es posible que las complicaciones derivadas de una OMA con evolución tórpida sean más graves cuando no se ha empleado antibiótico sistémico para el tratamiento de la OMA.
Beneficios de Probióticos en Rinitis Alérgica
Authors: Zaidiza Vargas Yohanna Andrea
Published: March 2020

Determinar la calidad de vida de pacientes con rinitis alérgica  posterior al tratamiento con probióticos orales dada su función   como regulador del sistema inmunológico obteniendo beneficios en la mejoría sintomática, disminución de recaídas, severidad de síntomas y uso de medicación base.
Tiempo seguro para cambiar de altitud en post operatorio de Timpanoplastia
Authors: Mateus Góngora Carolina , Ospina García Juan Camilo , Mayo Patiño Melissa
Published: March 2020

El objetivo de este estudio es evaluar si el cambio temprano de altitud y presión influye en el éxito de la timpanoplastia en población pediátrica. 

Estudio de cohorte descriptiva. Se revisaron historias clínicas de pacientes operados en el Hospital Universitario San Ignacio, entre septiembre de 2014 y noviembre de 2016. La tasa de éxito fue del 90%. El 52% de los pacientes (n=13) se trasladaron fuera de Bogotá, todos por vía terrestre. En dos pacientes no hubo integración del injerto. Observamos en nuestro grupo de pacientes, que el traslado temprano durante el postoperatorio de timpanoplastia no afecta negativamente la integración del injerto. Sin embargo, se requiere un mayor número de pacientes para lograr un resultado estadísticamente significativo.