bluuebunny/crossref_metadata_2025_split huggingface dataset:
On the regulator problem for linear systems over rings and algebras
Authors: Hermida-Alonso José Ángel , Carriegos Miguel V. , Sáez-Schwedt Andrés , Sánchez-Giralda Tomás 
Published: April 2021

Abstract
The regulator problem is solvable for a linear dynamical system

Σ

\Sigma

if and only if

Σ

\Sigma

is both pole assignable and state estimable. In this case,

Σ

\Sigma

is a canonical system (i.e., reachable and observable). When the ring

R

R

is a field or a Noetherian total ring of fractions the converse is true. Commutative rings which have the property that the regulator problem is solvable for every canonical system (RP-rings) are characterized as the class of rings where every observable system is state estimable (SE-rings), and this class is shown to be equal to the class of rings where every reachable system is pole-assignable (PA-rings) and the dual of a canonical system is also canonical (DP-rings).
On the acoustic transparency of perforated metal plates facing a porous fibrous material
Authors: Borelli Davide , Schenone Corrado 
Published: April 2021

Abstract
Thin impervious layers, cloths or perforated plates are usually utilized with fibrous absorbing materials in order to avoid small particles, coming from deterioration over time or from flow abrasive effect, becoming dislodged and polluting the environment. These protective facings are to be carefully considered and analyzed, since they can affect the acoustical behavior of the “backing” material. This study addresses this issue through an experimental survey and a theoretical analysis using the Transfer Matrix Method (TMM). Experiments have been performed in the frequency range 160–2,500 Hz, analyzing the different behaviors due to multiple combinations of percentage of open area and air gap between perforated facing and absorbing material. Experimental data have shown a marked effect of the percentage of perforation, at least up to a threshold value of 20%, whereas the air gap slightly affected the acoustic behavior of the covered absorbing material. The TMM was applied to the tested faced absorbing system, and experimental and theoretical results were compared, showing the good accuracy of the model. Several geometrical configurations were then modeled through TMM and the possibility of using this method in order to assess the acoustic transparency of perforated metal plates was assessed.
First principles study of the structural, electronic, optical and thermodynamic properties of cubic quaternary Al
x
In1−x
P
y
Bi1−y
alloys
Authors: Abdiche Ahmed , Guemou M’hamed , Moussa Rabah , Soyalp Fethi , Khenata Rabah 
Published: April 2021

Abstract
The non-relativistic full potential linearized augmented plane wave (FP LAPW) method was applied to investigate the structural, electronic, optical and thermodynamic properties of (ZB)-AlP, AlBi, InP and InBi compounds and their ternary Al
x
In1−x
P, Al
x
In1−x
Bi, AlP
x
Bi1−x
and InP
x
Bi1−x
and the ordered Al
x
In1−x
P
y
Bi1−y
quaternary alloys. For the exchange-correlation potential, the LDA, GGA and WC-GGA have been used to calculate structural parameters. The TB-mBJ approximation was used to compute the band structures. Our results for binary compound agree well with available data found in literature. The lattice constants and the bulk modulus versus compositions x and y deviate from the linearity. All quaternary alloys are semiconductors with direct band gap with the exception for Al0.25In0.75P0.25Bi0.75 and Al0.25In0.75P0.50Bi0.50, which exhibit a half metallic character (the band gap tends to zero). Furthermore, the optical properties such as the dielectric constants, refractive index, absorption, reflectivity and the energy loss have been calculated and analysed in the energy range varying from 0 to 14 eV. At the end, we have investigated some thermodynamic properties, where the lattice constants, the Debye temperature θ
D, the heat capacity C
V and the entropy S were carried out, plotted and discussed.
Interview Transcript of Black Music Matters and The Black Messiah Album
Authors: Dunn Adrian , Gipson Leah , Norris Marisol 
Published: April 2021

In an audio interview, Adrian Dunn, discusses his album, The Black Messiah, with Leah Gipson and Marisol Norris. As a commentary on religious life in the U.S., the music was initially performed the year that Donald Trump was elected president in resistance to dominant, white Christian nationalism and hate speech. Dunn sought to preserve this history in an album. Dunn explains that The Black Messiah affirms Black liberation and justice, and situates responsibility with all persons as the work of a shared humanity. The discussion reflects on American musical traditions, narratives, Black spirituality, and an integral relationship between music and freedom.
Is Communication A Receipt For Doctors? The Relationship Between Communication Competence And Trust: A Research On Breast Patients
Authors: KARAKAYA Çiğdem , ERENDAG SUMER Fulya , GÖK DEMİR Zuhal , DURMAZ Emel 
Published: April 2021

Although significant studies have been conducted in the field of health communication in terms of
communication competence, its role on trust in the radiology department needs further exploration.
The communication skills of radiologists are considered an important indicator of trust. Therefore,
the study aims to research the effect of communication competence on trust. With this aim the
current study seeks to contribute to health communication literature by researching the patients’
perceived communication competence of doctors as a determining factor that develop trust in the
radiology department. The research was carried out between December 2019 and March 2020 using a
questionnaire form with 321 breast patients in the radiology department in a public health institution in
Antalya, Turkey. The results of the study refer that communication competence as a whole concept has
a strong positive and statistically significant effect on trust. When the dimensions of communication competence are investigated, it is found that socioemotional communication is the only dimension that
has a strong effect on the formation of trust among communication competence.
Geological dimension of the cultural heritage: A case example of the Ajanta Caves (Maharashtra, India)
Authors: Gontareva Elena F. , Ansari Mohd Khalid , Ruban Dmitry A. , Ahmad Mashud , Singh Trilok Nath 
Published: April 2021

International development for the both geoconservation and geotourism requires attention to all kinds of (potential) geological heritage. The Ajanta Caves (western Maharashtra, India) is a famous cultural object consisting of 30 caves carved in the Deccan Traps and inscribed to the UNESCO list of the World Heritage Sites. Its examination permits to indicate four geological features, which are the artificial caves themselves (these mark geological activity of the man in the historical past), the end-Cretaceous floot basalts (these demonstrate the emplacement of Large Igneous Province and the relevant palaeoenvironmental catastrophe), the gorge of the Waghora River (this is peculiar landform resulted from the river erosion of hard rocks), and the rockfall hazard (this is an interesting engineering geological phenomenon linked to the caves construction/maintenance). Geological heritage value of these features is argued. Unfortunately, there is not any geotourism activity at the Ajanta Caves presently. The content analysis of the principal on-line resources (web pages) devoted to this cultural site reveals the absence of sufficient geological information that would facilitate geotourism. Generally, judgements about the Ajanta Caves and the other similar sites in the geological dimension permit to consider the wide spectrum of the geological heritage. They also highlight some extra opportunities for geotourism, which can benefit by its development at cultural sites with thousands of visitors.
A newer horizon in non-pharmacological management of intractable epilepsy of childhood: the ketogenic diet
Authors: Chaudhary Ansh , Chaudhary Bhupendra 
Published: April 2021

The ketogenic diet (KD) is a high fat, low carbohydrate and adequate protein diet that was formulated in the early 1920s as a treatment of intractable epilepsy, when only bromides and phenobarbitones were available. With the discovery of phenytoin in 1935 and other anticonvulsants in subsequent decades its popularity gradually waned off but recently KD has got a resurgence in the management of intractable epilepsy especially of childhood onset, despite the availability of increasing number of new Antiepileptic drugs and surgical techniques.
Biological Activity of Ethanol Extracts and Essential Oils fromCurcuma longa(Zingiberaceae),Cymbopogon nardus(Gramineae), andAcorus calamus(Acoraceae) againstPlutella xylostella(Lepidoptera: Plutellidae)
Authors: Phukhahad Supannee , Auamcharoen Wanida 
Published: April 2021

AbstractThe diamondback moth, Plutella xylostella (L.), is a major pest that has developed resistance to many groups of synthetic insecticides. Natural plant products present reliable alternatives for its management. In this study, the activities of essential oils and ethanol extracts from three medicinal plants, i.e., Curcuma longa L. (Zingiberaceae), Cymbopogon nardus (L.) Rendle (Gramineae), and Acorus calamus L. (Acoraceae), from Thailand against P. xylostella were evaluated. Four concentrations of the extracts (i.e., 0.625, 1.25, 2.5, and 5%) were tested. The essential oils and ethanol extracts of Cu. longa, Cy. nardus, and A. calamus exhibited different degrees of activity against P. xylostella. Of these, both the essential oil and ethanol extract of A. calamus at 5% (v/v) concentration exhibited feeding toxicity for P. xylostella larvae, resulting in 100% mortality 1 d after treatment, with a median lethal concentration of 0.528% for the essential oil and 1.074% for the ethanol extract. Furthermore, all concentrations of A. calamus ethanol extract exhibited contact toxicity to the larvae, resulting in &gt;75% mortality 3 d after treatment. All tested extracts, except A. calamus ethanol extract at the 0.625% concentration, exhibited high repellent activity against P. xylostella larvae, while Cu. longa and Cy. nardus ethanol extracts at 5% (w/v) concentration and A. calamus essential oil at 2.5% (v/v) concentration deterred oviposition by P. xylostella adults with an effective repellency &gt;70%. These results indicate that both essential oils and ethanol extracts of these plants have the potential to be developed as insecticides for use in integrated pest management of P. xylostella.
THE CONTAGION EFFECTS OF COVID-19 PANDEMIC ON CRYPTOCURRENCIES
Authors: Ullah Mahboob , Shaikh Maria , Jadoon Imran Abbas , Khan Muhammad Azizullah , Alizai Shahida Habib 
Published: April 2021

Purpose of the Study: In this research, the association between the COVID-19 pandemic and cryptocurrencies' price volatility has been examined.
Methodology: To check the contagion effects of the COVID-19 pandemic on the price volatility of cryptocurrencies: BITCOIN, LITECOIN, XRP(RIPPLE), and ETHEREUM, the prices of all four are deployed from 10th August 2016 to 10th August 2020. The exponential generalized autoregressive conditional heteroscedastic (EGARCH) model is used to check the leverage effect exists or not. Stata 16 has been used to execute all the tests.
Main Findings: The study's findings indicated that the leverage effect on the price volatility is present for LITECOIN, XRP(RIPPLE), and ETHEREUM but not for BITCOIN.
Applications of the study: This study is significant for investors to develop strategies for investments and secure the transactions and control the creation of additional currency units. Also, it gives insight to the policy and decision-makers to articulate proper guidelines to overcome or minimize the effect of COVID-19 on cryptocurrency.
Novelty/Originality of this Study: The motive for taking the crypto market into account is that the crypto market is one of the emerging markets and has started to have significance worldwide, linking with financial markets and economic growth. The leverage effect of COVID-19 is considered in this study as the epidemic has affected the supply and demand of goods due to lockdowns, blockages, and disruptions in delivery chains that lead to undiminished economic growth.
Rzeczywistość postkryzysowa a działania banków i zachowania ich pracowników z punktu widzenia etyki
Authors: Świeszczak Krzysztof , Świeszczak Marika 
Published: April 2021

Pojawiające się w ostatnich latach kryzysy stanowiły główną determinantę sposobu funkcjonowania sektora bankowego, aczkolwiek obecnie głównym zadaniem banków jako instytucji zaufania publicznego jest zaprojektowanie działań, dzięki którym możliwe będzie uniknięcie negatywnych konsekwencji potencjalnych, przyszłych zawirowań. Kluczową rolę odegrają ich pracownicy, zwłaszcza osoby współpracujące z klientami, gdyż w obliczu kryzysu zaufania odbudowa wiarygodności i pozytywnego wizerunku może stanowić fundament konkurencyjności banków. Celem artykułu jest analiza kondycji sektora bankowego z perspektywy globalnego kryzysu finansowego i kryzysu zaufania, przegląd działań z zakresu etyki przedsięwziętych przez banki w okresie po kryzysie oraz ocena ich skuteczności na podstawie opinii pracowników.
Patogen Penyakit Busuk Buah Kakao: Karakter dan Patogenisitas Phytophthora palmivora Isolat Asal Pakuwon, Sukabumi
Authors: Wartono Wartono , Taufiq Efi 
Published: April 2021

Phytophthora palmivora (Butl.)<em> is a major obstacle in cocoa cultivation worldwide. The study aimed to determine the morphological character and pathogenicity of P. palmivora Pakuwon isolate. The study was carried out from November 2020 to January 2021, which consisted of 3 activities e.g. (1) pathogen isolation, tests on growth rate and colony formation, and stimulation of sporangia, zoospore, and clamydospore formation, which was performed in CMA, PDA, and mung bean media. The parameters observed were colony shape, growth rate, shape and size of sporangia, papillae, and sporangiophores, also chlamydospore and hyphal diameters; (2) To determine the possibility of different mating types, two isolates were grown on CMA medium in one petri dish; (3) The pathogenicity test, using a detached fruit assay by inoculating the cocoa pods with mycelium plug and zoospores. The patogenicity test was conducted in a completely randomized design with 4 replications, and the parameter observed was the area of </em><em>the spot. The isolation obtained 3 isolates, the mycelium of all three isolates showed white in color, cottony, and no pattern in shape. The diameters of hyphae and chlamydospores were 5.6 - 6.3 mm and 39.0 - 43.2 mm, respectively. The sporangia were ovoid, ellipsoid, subsperic, obpyriform, and irregular. Sporangia measured 5.6 - 60.1 mm in length and 30.4 - 32.9 mm in width. Papillae were obviously visible with an average length of 6.8 mm. Test on mating types showed no oospores formed. PPkw1 isolates showed higher growth rates and more pathogenic than PPkw2 and PPkw3. The difference of pathogenicity of each </em>P. palmivora<em> isolates originated from Pakuwon can be used for selection of cocoa resistance in the future.</em>
Emisi Gas Rumah Kaca dan Cadangan Karbon pada Perkebunan Kopi Organik dan Konvensional di Kabupaten Badung, Bali
Authors: Yunianti Ika Ferry , Aprianthina I.D.A Yona , Kartikawati Rina , Yulianingsih Eni 
Published: April 2021

<em>Coffee is a commodity that has an important role in the national economy. Currently, coffee cultivation is threatened by climate change caused by global warming due to increased green house gas (GHG) emissions. The organic plantation model is a farming model that is considered to increase soil and crop productivity, reduce GHG emissions, and increase carbon sequestration effectively. The study was aimed to estimate GHG emissions and carbon stocks in organic and conventional coffee plantations in Badung Regency, Bali Province and Laboratory in Balai Penelitian Lingkungan Pertanian, Pati, Jawa Tengah Province, in July 2018. The study was conducted in smallholder coffee plantations in Badung Regency and the analysis was carried out at Laboratory of Indonesian Agricultural Environtment Research Institute. This study used a survey method, while the sampling used a purposive sampling method in organic and conventional coffee plantation. GHG emissions measurement was carried out with a close chamber method by simultaneously the carbon stocks measurement was carried out with the non-destructive method for plant biomass and destructive for understorey. The results showed that organic and conventional coffee plantations emitted GHG by 20.71 and 39.75 ton CO<sub>2</sub>e ha<sup>-1</sup> and stored carbon stock by 227.56 and 288.31 ton CO<sub>2</sub>e ha<sup>-1</sup>, respectively. The differences in GHG emissions and carbon stocks are partly due to differences in management system and the diversity of plant. The management system of the organic coffee plantation should be improved to support handling of the impacts of climate change in Bali Province.</em>
Problematika pengembangan kepustakaan Islam: studi kasus di empat perpustakaan Perguruan Tinggi Keagamaan Islam Negeri (PTKIN) Jawa Timur
Authors: Mufid Mufid , Zuntriana Ari 
Published: April 2021

Introduction. This study aims to examine the Islamic collection development process conducted by 4 (four) Islamic universities’ libraries in East Java, including selection criteria and tools, the use of the collection, and challenges faced by the librarian Data Collection Method. Using a mixed-methods approach with surveys and interviews, four head of libraries and 338 students participated in this research. Analysis Data. Data from the questionnaire were analyzed using descriptive quantitative analysis method while the qualitative data from interviews were analyzed using the thematic analysis technique. Results and Discussions. The results showed that the libraries did not have any written collection development policies. The four libraries have used the right selection tools, but most of them have not utilized reviews of books based on online sources and social media. At present, the four libraries have not had any special subjects which potentially emerged as a distinction of the libraries’ collection. Nevertheless, there has been a plan to develop such a special subject of Islamic collection. The use of Islamic literature collections among students were considered in medium level of use. The challenges in developing Islamic literature collections are sourced both from internal and external sources. Internally, the library has not evaluated their collection development policies. While the low participation of lecturers in the development of library collections emerged as obstacles from external sources. Conclusions. Based on the findings, it can be concluded that the libraries involved in this study still needs improvements in some areas.
A Well Flux Surveillance and Production Ramp-Up Method for Openhole Standalone Screen Completion
Authors: Karaaslan M. , Wong G. K. , Soter K. L. , Hicking S. H. , Yousif Majeed H. 
Published: April 2021

SummaryWell surveillance requires practical models to balance the reward of maximizing production with the risk of ramping up production too much, which damages the completion. In this paper we present a method to monitor and ramp up production for openhole standalone screen (OH-SAS) completion. The objective is to optimize production using pressure transient analyses to assess the completion impairment and failure risks during the production ramp-up process. The flux model incorporates filter-cake pinholes, which are formed from nonuniform deposition and cleanup of filter cake during drilling and completion operations. Pinholes cause concentrated fluxes and increase completion failure risks. The method comprises three components, which are (1) determine pinhole properties from laboratory tests, (2) relate completion pressure drop of production through pinholes to pressure transient analyses, and (3) distribute fluxes in the standalone screen wellbore. Examples are presented and show that the completion pressure drop as a function of flow rate is nonlinear and higher with pinholes than without pinholes. By not incorporating pinholes, operations can potentially limit ramp-up. Flux distribution examples show that the largest impingement or radial velocity is at the top section of screen. The axial annular flow velocity or scouring velocity is two orders of magnitude larger than the screen impingement velocity. An integrated flux surveillance method for OH-SAS completion is presented for field applications.
Comprehensive Analysis of Angiogenesis subtype of Squamous Cell Carcinoma
Authors: Qin Fanglu , Deng Kun , Qin Junqi , Xu Zhanyu , Yuan Liqiang , Wei Jiangbo , Sun Yu , Zheng Tiaozhan , Li Shikang 
Published: April 2021

Abstract
Background: Squamous cell carcinoma (SCC) is a disease with distinct management complexities as it displays a remarkably heterogeneous molecular subtype. However, the landscape of angiogenesis for SCC is not fully investigated.Method and materials: The integrated analysis for the angiogenesis-related subtype for SCC and was performed using the ConsensusClusterPlus package based on angiogenesis-related genes and TCGA data respectively. We analyzed the alternation of the genes and miRNAs as well as pathways associated with angiogenesis. Next, we evaluated the prognostic value of the SCC subtype, the mode of regulation, the correlation with genomic characteristics, immune microenvironment, and clinical features of the angiogenesis subtypes.Results: Totally, a total of 1368 SCC samples were included in this study. Two angiogenesis subtypes were then identified based on the one hundred and sixty-three angiogenesis-related genes with subtype1 of 951 SCC patients and subtype2 of 417 SCC. GSEA revealed that angiogenesis and epithelial-mesenchymal transition, inflammatory response, hypoxia was enriched in the subtype1 and suggested that the subtype 1 were angiogenesis-subtype of SCC. Eight of the 15 immune checkpoints (ADORA2A, BTLA, CD276, CYBB, HAVCR2, SIGLEC7, SIGLEC9, and VTCN1) were significantly up-regulated while C10orf54 were significantly down-regulated in the angiogenesis subtype. The survival analysis revealed that the patients in the angiogenesis subtype have a poorer survival outcome than that in the non-angiogenesis subtype (P=0.017 for disease free interval and P=0.00013 for overall survival).Conclusion: Our analysis suggests that the importance of the angiogenesis pathway in SCC and may represent an underappreciated hallmark of SCC progression.