bluuebunny/crossref_metadata_2025 huggingface dataset:
Moment – rotation dependence under fire conditions for steel beam-to-column joint with known flexibility
Authors: Maślak Mariusz , Snela Małgorzata
Published: September 2020

Simplified methodology helpful in a reliable specification of moment - rotation dependences characterizing the steel beam-to-column joint flexibility under fully developed fire conditions is presented and discussed in detail. The shape of identified dependences changes with the temperature increase of the members connected in the considered joint. The analogous relation, known a priori and determined for examined joint being under persistent design situation, is adopted as the reference dependence specified on the basis of the classical component approach. In the presented paper the alternative calculation technique, recommended by the authors in this field, deals with the replacement of such reference relation by another one resulted from the use of Richard – Abbott formal model. Furthermore, the additional approach, taken from the standard PN-EN 1993-1-8, is examined for comparative purposes. To transform such input dependence, related to the room member temperature, into the case of fully developed fire scenario it is firstly approximated by suitable segmental curve and afterwards the relative reduction ratios referring to the steel elasticity modulus as well as to the steel yield point, the joint is made of, are taken into consideration. As a result, a number of the requested relations is obtained, differentiated dependently on the assumed member temperature.
Verification of prying effect in prestressed end-plate connection
Authors: Ostrowski Krzysztof , Łaguna Jan , Kozłowski Aleksander
Published: September 2020

End-plate connections are very often used is steelwork, as tension and bending connections. As a result of deflection of end plate, additional forces, known as prying forces arise and consequently increase stresses in bolts. Eurocode 1993-1-8 do not distinguish end-plate connections prestressed by high strength bolts from non-prestressed. The aim of the paper is to perform the comparison of previous analytical models and code regulations for coefficient of prying forces to the experimental tests and modelling by finite element method. Results of the analysis show that the behaviour of prestressed connection is essentially different with comparison to non-prestressed.
Resistance and stability of steel channel section beams
Authors: Szczerba Radosław
Published: September 2020

Analysis of the resistance and stability of steel beam of channel section loaded in the plane parallel to beam web, which does not pass through shear center, is presented in the paper. The consequence of this is the creation of a torsional moment that generates normal stresses due to bimoment and shear stresses as a result of St. Venant and warping torsion. In the paper, the contribution of those stresses to the global state of stress of simply supported beam is presented. Calculations were made according to Eurocodes and to the Polish Standard PN-90/B-3200. The elastic critical moment for lateral-torsional buckling was calculated with the use of Autodesk Algor Simulation Professional 2012 program.
Economic criteria for the selection of wall formwork
Authors: Biruk Sławomir , Jaśkowski Piotr
Published: September 2020

Planning formwork (selecting systems, designing layout of formwork members) affects the economy of in situ concrete structures. Formwork rental cost, and labor cost of formwork installation and removal,  have a significant share in total cost. The paper investigates into the problem of minimizing wall shuttering cost. A mathematical model of the problem of panel layout is proposed, and its operation is illustrated by the case with two optimization criteria.
Integrating Construction Process Documentation with the use of Building Information Modeling
Authors: Zima Krzysztof
Published: September 2020

This paper presents a practical approach to the problem of data collection using the BIM model. The aim is to show how to use the BIM model to capture the data from the 3D design documentation, construction documents, construction schedule, and the use of BIM for the acquisition and storage of documents, including specifications, details of materials, information producers, workshop drawings, photographs, etc.
Applications of truss topology optimization in the design of reinforced concrete structures using „Strut and Tie” models
Authors: Bołbotowski Karol , Knauff Michał , Sokół Tomasz
Published: September 2020

Although Strut and Tie models are often used in practical design due to their apparent concept based on truss analysis, the creation of a model consistent with behaviour of the real structure is not an easy task. Frame corner model considered in the paper and presented in code [7] and article [8] exemplifies the problem. The authors proposed a method of automatic generating of ST models by making use of truss topology optimization (volume minimization problem). The method is based on classical ground structure approach. The authors introduced a method of including the cost of nodes in the objective function, which allowed to obtain solutions consisting of rationally small number of bars (unlike Michell’s structures). Moreover, algorithms ensuring consistency with Eurocode requirements were developed. The method was implemented in computer program. With the use of the software the authors proposed an alternative ST model for the frame corner, which requires considerably less reinforcement steel in comparison with the model suggested by the code. The versatility of the program was well proven in several other examples of plane stress problems in reinforced concrete design.
The Influence of Concrete Strength on Shear Capacity of Reinforced Concrete Members without Shear Reinforcement
Authors: Słowik Marta
Published: September 2020

In the paper, dimensioning rules for shear capacity in reinforced concrete members without shear reinforcement given in Eurocode 2, ACI Standard 318 and Model Code 2010 are described. The fib Model Code recommendations are described in more detailed way as they are based on a new concept. The shear strength calculated on the basis of the mentioned codes is later compared to the results of test from professional literature in order to verify standard methods and to analyze the influence of concrete strength on shear capacity in beams without stirrups.
Wind Tunnel Measurements of Aeroelastic Guyed Mast Models
Authors: Bęc Jarosław , Lipecki Tomasz , Błazik-Borowa Ewa
Published: September 2020

The dynamic response of guyed masts models to the wind action in the wind tunnel was analyzed in the paper. Accelerations and forces in guys were measured. Spectra of the response were calculated. The influence of the wind structure on the response was analyzed. The results obtained from experiments were compared to the ones coming from a numerical analysis.
Contribution to the diagnostics of rock bolts using elastic wave propagation
Authors: Rucka Magdalena
Published: September 2020

This paper presents the numerical and experimental analyses of elastic wave propagation in a steel rod embedded in a composite material. The experiment involved the phenomenon of wave propagation generated by a piezoactuator and non-contact measurements by means of a laser vibrometer. In numerical simulations, the effect of values of elastic modulus of the material on characteristics of waves propagating in a steel rod was analysed. Conducted research presents the first stage of work focused on ultrasonic diagnostics of rock bolts.
The numerical analysis of micro-damage evolution in damaged element with structural discontinuity
Authors: Kossakowski Paweł
Published: September 2020

The numerical analysis of microdamage evolution in S235JR steel is presented in the paper. The simulation was performed basing on the Gurson-Tvergaard-Needleman material model which takes into consideration the influence of microdamage to the material strength. The plate element with a central hole was considered. It modelled the structure discontinuity which may occur in structural element due to such a phenomenon as corrosion. The numerical simulation and analysis of micro-damage evolution for this element made of S235JR steel was carried out, which allowed to show and detect the micro-crack initiation and area subjected to final failure.
Diagnostics of concrete plate in bending with ultrasonic waves modulated by low frequency oscillations
Authors: Meronk Błażej , Wilde Krzysztof
Published: September 2020

The paper presents the experimental study on the inter-modulation method for the diagnostics of concrete elements. The tests were conducted on a concrete plate subjected to ultrasonic waves and low frequency vibrations. The nonlinear acoustic effects, recorded in the experiments, made it possible to detect the presence of damaged zones. Further studies are necessary to establish the relation between the sidebanes of frequency spectra and the size of the damaged zone.
The tune of mass dampers for the Municipal Stadium in Poznan
Authors: Wielgos Piotr
Published: September 2020

This paper presents the issues related to the design of the multiple tuned mass dampers (MTMD) for the Municipal Stadium in Poznan. It is focused on the design issues, in particular the selection of parameters of mass dampers, their location at the main structure (in this case the full modal analysis was carried out) and the optimization of dampers parameters (the optimization algorithm DAMP-SYM application was used). The verification of the assumptions made during the design stage was carried out, taking into account the dynamic tests of TMD as well as the measurements on the real object of Municipal Stadium in Poznan.
RANCANG BANGUN TAMAN BERMAIN TRADISIONAL DI PERUMAHAN JOYOGRAND RW 9 KELURAHAN MERJOSARI KOTA MALANG
Authors: Tri Harjanto Suryo , Hamka  , Widyarthara Adhi
Published: September 2020

Taman bermain tradisional diperumahan Joyogrand masuk dalam kategori Taman Lingkungan Perumahan dan Permukiman  berdasarkan Peraturan Menteri Dalam Negeri No. 1 Tahun 2007 mengenai Ruang Terbuka Hijau.  Rancang bangun taman bermain tradisional dengan memanfaatkan lahan kosong di lingkungan Perumahan Joyogrand RW 09 Kelurahan Merjosari Kota Malang, bertujuan untuk meminimalisir ketergantungan anak-anak di lingkungan Perumahan Joyogrand terhadap penggunaan gadget yang semakin  meningkat di era revolusi industri 4.0 sekarang ini. Rancang bangun taman bermain tradisional ini merupakan upaya untuk menambah ruang terbuka lingkungan yang berfungsi sebagai ruang sosial warga sekitar. Metode yang digunakan dalam kegiatan pengabdian kepada masyarakat ini  adalah pendekatan partisipatori sosial dan kualitatif analisis deskriftif, observasi lapangan dan sosial masyarakat, untuk mengidentifikasi keterlibatan warga dalam menentukan konsep taman bermain tradisional yang diinginkan, sebagai pemenuhan terhadap kebutuhan ruang komunal lingkungan perumahan, dan melestarikan nilai-nilai kearifan lokal yang terdapat pada permainan tradisional. Hasil kegiatan rancang bangun ini menunjukkan bahwa tingkat parsitipasi warga dalam kegiatan ini sangat tinggi dan tingkat pemanfaatan oleh warga (khususnya anak-anak) pasca bangun juga menunjukkan hal yang positif.
SIGNIFIKANSI ELEMEN ARSITEKTUR BANGUNAN KOLONIAL BERGAYA ART DECO DI KOTA MALANG
Authors: Ramli Syamsun , Santosa Herry , Antariksa
Published: September 2020

Tampilan visual dan karakter bangunan dibentuk oleh elemen arsitekturnya. Bangunan bergaya Art Deco memiliki karakter tersendiri. Kota Malang berkembang pesat di era pemerintah Hindia Belanda pada tahun 1920 sampai 1938. Dalam rentang waktu tersebut gaya Art Deco sedang berkembang di Eropa. Tren ini berdampak terhadap bangunan di Kota Malang sehingga sebagian bangunan kolonial bergaya Art Deco. Bangunan-bangunan tersebut berada di kawasan yang memiliki nilai komersial yang tinggi. Hal ini dapat menyebabkan perubahan pada bangunan karena tuntutan komersial, baik keseluruhan bangunan maupun elemen arsitekturnya. Sehingga penelitian ini bertujuan untuk menilai signifikansi elemen arsitektur bangunan kolonial bergaya Art Deco di Kota Malang, sebagai upaya untuk mempertahankan karakter bangunan tersebut. Penelitian ini menggunakan pendekatan kuantitatif, dimana data didapatkan menggunakan kuesioner. Data yang diperoleh kemudian dianalisis menggunakan program SPSS. Hasil penelitian menunjukan bentuk bangunan, atap, kanopi, ornamen, material, dan warna berpengaruh signifikan terhadap karakter bangunan kolonial bergaya Art Deco di Kota Malang.
Advanced Integrated Photonic Filters Designed with Coupled Sagnac Loop Reflectors
Authors: Moss David
Published: September 2020

We
theoretically investigate integrated photonic resonators formed by two mutually
coupled Sagnac loop reflectors (MC-SLRs). Mode interference in the MC-SLR
resonators is tailored to achieve versatile filter shapes with high performance,
which enable flexible spectral engineering for diverse applications. By
adjusting the reflectivity of the Sagnac loop reflectors (SLRs) as well as the
coupling strength between different SLRs, we achieve optical analogues of Fano
resonance with ultrahigh spectral slope rates, wavelength interleaving / non-blocking
switching functions with significantly enhanced filtering flatness, and compact
bandpass filters with improved roll-off. In our designs the requirements for practical
applications are considered, together with detailed analyses of the impact of
structural parameters and fabrication tolerances. These results highlight the
strong potential of MC-SLR resonators as advanced
multi-functional integrated photonic filters for flexible spectral engineering in
optical communications systems.
Protocolo anestésico para ressecção parcial da parede torácica seguida de reconstrução em cães: relato de dois casos
Authors: Julião Gustavo Henrique , Coutinho Vieira Guilherme , Palma Correa da Silva Mariana , Simão Sandra Lucia , Zavataro Anna Luiza , Antonelli Chagas Mileni , Ribas Jané Daniela , De Paula Reis Filho Nazilton , Perez Floriano Beatriz
Published: September 2020

O presente trabalho relata o protocolo anestésico utilizado em dois cães submetidos à cirurgia de ressecção e reconstrução da parede torácica devido a neoplasmas, no Hospital Veterinário Roque Quagliato do Centro Universitário das Faculdades Integradas de Ourinhos, São Paulo. Uma cadela poodle de 10 anos e um cão rottweiler de um ano e três meses foram submetidos à anestesia geral com isofluorano, bloqueio intercostal de, respectivamente, seis e sete espaços intercostais com lidocaína 2% e bupivacaína 0,5% e infusão contínua de morfina (0,1 mg/kg/h), lidocaína (50 μg/kg/minuto) e midazolam (0,1 mg/ kg/h). No período pós-operatório imediato, ambos receberam administração peridural de morfina 0,2 mg/kg e fentanila 2 μg/kg diluídos com NaCl 0,9% para 0,3 mL/kg. Um tubo de analgesia foi deixado durante as 48 horas subsequentes na ferida cirúrgica para administração de lidocaína e bupivacaína em total de uma dose tóxica por dia, fracionada para cinco aplicações. A prescrição analgésica pós-operatória constituiu-se de tramadol 4 mg/kg e dipirona 25 mg/kg a cada oito horas durante sete dias, juntamente com meloxicam 0,1 mg/kg a cada 24 horas durante três dias. Os animais recuperaram-se tranquilamente e não foram observados sinais de dor ao longo dos sete dias subsequentes. Recomenda-se o protocolo relatado para cirurgias de ressecção da parede torácica em cães.
Abordagem clínico-cirúrgica de desvio portossistêmico congênito em pequenos animais: quais as novidades?
Authors: Murata Hayashi Ayne , Batista Lorigados Carla Aparecida , Tabacchi Fantoni Denise , Teixeira Fabio , Brunetto Márcio Antonio , Brandão de Campos Fonseca Pinto Ana Carolina , Matera Julia Maria
Published: September 2020

Foi realizada uma revisão sobre a fisiopatogenia, sinais clínicos, diagnóstico e principais tratamentos e técnicas para o desvio portossistêmico em pequenos animais. As fontes pesquisadas foram: CAB, MEDILINE por um período retrospectivo de 20 anos e acervos da Biblioteca da Faculdade de Medicina Veterinária e Zootecnia (FMVZ) da Universidade de São Paulo (USP). O desvio portossistêmico congênito (DPSC) é uma das anormalidades vasculares mais comuns em cães, as raças de pequeno porte apresentam maior incidência. Os DPSCs em cães e gatos são comunicações vasculares que ocorrem do sistema venoso portal para o sistema venoso sistêmico, ou seja, fazem uma via secundária. Há dois tipos de DPSCs, intra-hepático e extra-hepático, observados com frequência em raças de grande porte e miniaturas, respectivamente. O diagnóstico é baseado no histórico de animais jovens com retardo de crescimento, letargia, convulsão ou distúrbio de comportamento principalmente após alimentação, retorno demorado de anestesia ou sedação, crise de encefalopatia hepática, em raças predispostas. A confirmação do vaso anômalo é realizada pela ultrassonografia com doppler, angiografia por tomografia computadorizada ou por ressonância magnética. O manejo clínico pode aliviar sinais clínicos de encefalopatia hepática, porém em longo prazo, é questionável, pois o fluxo sanguíneo portal continua desviado para a circulação sistêmica, comprometendo a distribuição de fatores hepatotróficos ao fígado e ocorrendo uma contínua atrofia do mesmo. O único tratamento definitivo é o cirúrgico, idealmente com técnica que atenue progressivamente o vaso anômalo e evite a hipertensão portal aguda. Dentre as técnicas de tratamento cirúrgico descritas o uso de ameroide constrictor apresenta-se como uma das formas mais seguras a obtenção do fechamento do desvio. Entretanto, os portadores de DPSC podem sofrer de complicações perioperatórias graves e necessitam de abordagem clínicocirúrgica específica, associado a um diagnóstico por imagem precisa para a correta localização do vaso anômalo e sucesso cirúrgico.
Saúde mental e o isolamento social de idosos em perí­odo de pandemia
Authors: Silva dos Santos Jaqueline Maria , dos Santos Messias Euda Maria , Ferreira Lopes Raquel
Published: September 2020

Objetivo: Descrever impactos que o isolamento social pode acarretar na saúde mental dos idosos durante a pandemia. Método: Trata-se de uma revisão bibliográfica integrativa, utilizando os descritores "Coronavirus Infections ", "Pandemics", "Mental Health ", e "Aged", realizando a combinação entre si e o operador boleano OR como estratégia de busca nas bases de dados: LILACS, SciELO, WEB OF SCIENCE. Adotados critérios de inclusão: publicações no perí­odo de 2020 que tratassem do assunto, em português e inglês. Como critérios de exclusão: repetição nas bases de dados, artigos fora do contexto quanto a pergunta norteadora da pesquisa. Resultado: Foram encontrados 32 artigos, selecionados 26, e destes foram analisados 08. Conclusão: A saúde mental em perí­odo de pandemia foi explí­cita como um fator de impacto, refletindo os desfechos favoráveis e desfavoráveis no contexto da saúde mental. É evidente a necessidade de promoção para intervenções afim de minimizar impactos negativos para a saúde mental.
Atuação dos profissionais de saúde e o processo de humanização no centro obstétrico
Authors: Fragoso Veloso Ana Cecí­lia , Scolfild Rodrigues da Silva Liniker , Gomes de Barros Phelipe , Trigueiro Gomes Roberta Rosas , Souza dos Santos Auridéa , Da Silva Oliveira Helena Maria
Published: September 2020

Objetivo: Verificar na literatura cientí­fica a atuação dos profissionais de saúde acerca do processo de humanização no centro obstétrico. Método: Trata-se de um estudo bibliográfico, tipo revisão sistemática. Realizou-se a busca por artigos; publicados nos últimos cinco anos (2014 a 2019); nos idiomas português, inglês e espanhol; disponí­veis na í­ntegra. Foram consultadas as seguintes plataformas de dados: BDENF, MEDLINE, LILACS e SciELO. Resultado: Inicialmente foram encontrados 174; contudo, após a leitura permaneceram apenas os que atendiam aos critérios para inclusão e exclusão descritos na metodologia, totalizando 10 estudos. Conclusão: Observou-se a imprescindibilidade de reformar as práticas diárias, consolidar a adoção de práticas firmadas em fundamentos cientí­ficos impulsionando os profissionais e a sociedade civil a assegurar as gestantes um atendimento de saúde com igualdade e remediabilidade; e livre de violência obstétrica.
Adesão í s medidas de biossegurança da enfermagem na unidade de terapia intensiva: revisão sistemática
Authors: Costa Karina Polyana , Coutinho de Melo Alexandre , Barbosa Silva Bruno , Costa Isabele Adriana , Gomes de Freitas Leonardo , Consolação dos Santos Regina , Nunes Andrade Silmara , Silva Souza Débora Aparecida
Published: September 2020

Objetivo: Evidenciar os fatores determinantes para adesão das medidas de biossegurança pela equipe de Enfermagem na Unidade de Terapia Intensiva. Método: Estudo de revisão sistemática, que usou o instrumento Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA). A busca foi realizada a partir de artigos publicados no perí­odo de 2004 a 2019, por dificuldade de encontrar publicações em menor perí­odo acerca da temática deste estudo. Resultados: O conhecimento e as ações de promoção e prevenção, como a lavagem de mãos e o uso de Equipamento de Proteção Individual, além de recursos fí­sicos, são fatores determinantes para adesão í s medidas de biossegurança na UTI. Conclusão: As medidas de biossegurança garantem a segurança do paciente, e, por isso, é importante que os profissionais sejam capacitados regularmente para prevenir dificuldades e falhas de adesão com as medidas de biossegurança o que pode colocar em risco o paciente e o profissional da enfermagem.
Restricted Online Ramsey Numbers of Matchings and Trees
Authors: Briggs Joseph , Cox Christopher
Published: September 2020

Consider a two-player game between players Builder and Painter. Painter begins the game by picking a coloring of the edges of $K_n$, which is hidden from Builder. In each round, Builder points to an edge and Painter reveals its color. Builder's goal is to locate a particular monochromatic structure in Painter's coloring by revealing the color of as few edges as possible. The fewest number of turns required for Builder to win this game is known as the restricted online Ramsey number. In this paper, we consider the situation where this "particular monochromatic structure" is a large matching or a large tree. We show that in any $t$-coloring of $E(K_n)$, Builder can locate a monochromatic matching on at least $\frac{n-t+1}{t+1}$ edges by revealing at most $O(n\log t)$ edges. We show also that in any $3$-coloring of $E(K_n)$, Builder can locate a monochromatic tree on at least $n/2$ vertices by revealing at most $5n$ edges.
Codegree Threshold for Tiling Balanced Complete $3$-Partite $3$-Graphs and Generalized $4$-Cycles
Authors: Hou Xinmin , Liu Boyuan , Ma Yue
Published: September 2020

Given two $k$-graphs $F$ and $H$, a perfect $F$-tiling (also called an $F$-factor) in $H$ is a set of vertex-disjoint copies of $F$ that together cover the vertex set of $H$. Let $t_{k-1}(n, F)$ be the smallest integer $t$ such that every  $k$-graph $H$ on $n$ vertices with minimum codegree at least $t$ contains a perfect $F$-tiling.  Mycroft (JCTA, 2016) determined  the asymptotic values of $t_{k-1}(n, F)$ for $k$-partite $k$-graphs $F$ and conjectured that the error terms $o(n)$ in $t_{k-1}(n, F)$ can be replaced by a constant that depends only on $F$. In this paper, we determine the exact value of $t_2(n, K_{m,m}^{3})$, where $K_{m,m}^{3}$ (defined by Mubayi and Verstraëte, JCTA, 2004) is the 3-graph obtained from the complete bipartite graph $K_{m,m}$ by replacing each vertex in one part by a 2-elements set. Note that $K_{2,2}^{3}$ is  the well known  generalized 4-cycle $C_4^3$ (the 3-graph on six vertices and four distinct edges $A, B, C, D$ with $A\cup B= C\cup D$ and $A\cap B=C\cap D=\emptyset$). The result confirms Mycroft's conjecture for $K_{m,m}^{3}$. Moreover, we improve the error term $o(n)$ to a sub-linear term when $F=K^3(m)$ and show that the sub-linear term is tight for $K^3(2)$, where $K^3(m)$ is the complete $3$-partite $3$-graph with each part of size $m$.
Extendable Shellability for $d$-Dimensional Complexes on $d+3$ Vertices
Authors: Culbertson Jared , Dochtermann Anton , Guralnik Dan P. , Stiller Peter F.
Published: September 2020

We prove that for all $d \geq 1$, a shellable $d$-dimensional complex with at most $d+3$ vertices is extendably shellable. The proof involves considering the structure of `exposed' edges in chordal graphs as well as a connection to linear quotients of quadratic monomial ideals.
Sorting Permutations with Fixed Pinnacle Set
Authors: Rusu Irena
Published: September 2020

We give a positive answer to a question raised by Davis et al. (Discrete Mathematics 341, 2018), concerning permutations with the same  $\pi_{i-1}<\pi_i>\pi_{i+1}$. The question is: given $\pi,\pi'\in S_n$ with the same pinnacle set $S$, is there a sequence of operations that transforms $\pi$ into $\pi'$ such that all the intermediate permutations have pinnacle set $S$? We introduce {\em balanced reversals}, defined as reversals that do not modify the pinnacle set of the permutation to which they are applied. Then we show that $\pi$ may be sorted by balanced reversals (i.e. transformed into a standard permutation $Id_S$), implying that $\pi$ may be transformed into $\pi'$ using at most $4n-2\min\{p,3\}$ balanced reversals, where $p=|S|\geq 1$. In case $p=0$, at most $2n-1$ balanced reversals are needed.
The $1/k$-Eulerian Polynomials of Type $B$
Authors: Ma Shi-Mei , Ma Jun , Yeh Jean , Yeh Yeong-Nan
Published: September 2020

In this paper, we define the $1/k$-Eulerian polynomials of type $B$. Properties of these polynomials, including combinatorial interpretations, recurrence relations and $\gamma$-positivity are studied. In particular, we show that the $1/k$-Eulerian polynomials of type $B$ are $\gamma$-positive when $k>0$. Moreover, we define the $1/k$-derangement polynomials of type $B$, denoted $d_n^B(x;k)$. We show that the polynomials $d_n^B(x;k)$ are bi-$\gamma$-positive when $k\geq 1/2$. In particular, we get a symmetric decomposition of the polynomials $d_n^B(x;1/2)$ in terms of the classical derangement polynomials.
Diameter and Stationary Distribution of Random $r$-Out Digraphs
Authors: Addario-Berry Louigi , Balle Borja , Perarnau Guillem
Published: September 2020

Let $D(n,r)$ be a random $r$-out regular directed multigraph on the set of vertices $\{1,\ldots,n\}$. In this work, we establish that for every $r \ge 2$, there exists $\eta_r>0$ such that $\mathrm{diam}(D(n,r))=(1+\eta_r+o(1))\log_r{n}$. The constant $\eta_r$ is related to branching processes and also appears in other models of random undirected graphs. Our techniques also allow us to bound some extremal quantities related to the stationary distribution of a simple random walk on $D(n,r)$. In particular, we determine the asymptotic behaviour of $\pi_{\max}$ and $\pi_{\min}$, the maximum and the minimum values of the stationary distribution. We show that with high probability $\pi_{\max} = n^{-1+o(1)}$ and $\pi_{\min}=n^{-(1+\eta_r)+o(1)}$. Our proof shows that the vertices with $\pi(v)$ near to $\pi_{\min}$ lie at the top of "narrow, slippery tower"; such vertices are also responsible for increasing the diameter from $(1+o(1))\log_r n$ to $(1+\eta_r+o(1))\log_r{n}$.
Avoiding 5/4-Powers on the Alphabet of Nonnegative Integers
Authors: Rowland Eric , Stipulanti Manon
Published: September 2020

We identify the structure of the lexicographically least word avoiding $5/4$-powers on the alphabet of nonnegative integers. Specifically, we show that this word has the form $\mathbf{p} \, \tau ( \varphi(\mathbf{z}) \varphi^2(\mathbf{z}) \cdots)$ where $\mathbf{p},\mathbf{z}$ are finite words, $\varphi$ is a $6$-uniform morphism, and $\tau$ is a coding. This description yields a recurrence for the $i$th letter, which we use to prove that the sequence of letters is $6$-regular with rank $188$. More generally, we prove $k$-regularity for a sequence satisfying a recurrence of the same type.
Sorting with Pattern-Avoiding Stacks: The 132-Machine
Authors: Cerbai Giulio , Claesson Anders , Ferrari Luca , Steingrímsson Einar
Published: September 2020

This paper continues the analysis of the pattern-avoiding sorting machines recently introduced by Cerbai, Claesson and Ferrari (2020). These devices consist of two stacks, through which a permutation is passed in order to sort it, where the content of each stack must at all times avoid a certain pattern. Here we characterize and enumerate the set of permutations that can be sorted when the first stack is $132$-avoiding, solving one of the open problems proposed by the above mentioned authors. To that end we present several connections with other well known combinatorial objects, such as lattice paths and restricted growth functions (which encode set partitions). We also provide new proofs for the enumeration of some sets of pattern-avoiding restricted growth functions and we expect that the tools introduced can be fruitfully employed to get further similar results.
Study on “cold” Model of the Fluidization Process of Various Types of Biomass and Its Mixture With Coal
Authors: Isemin Rafail , Kuzmin Sergey , Teplitskii Yuri , Milovanov Oleg , Mikhalev Alexander , Buchilko Eduard , Klimov Dmitry , Nebyvaev Artemiy , Grebenkov Anatoly
Published: September 2020

The analysis of experimental method for the evaluation of Umf in gas fluidized beds was carried out. It was based on pressure fluctuation measurements in which Umf is determined by the relationship between the standard deviation of pressure measurements and fluid velocity. Unlike previous works, this method was used to determine the minimum fluidization velocity of polydisperse beds of biomass (milled litter), and for beds of mixture of coal ash or sand particles and straw pellets. The experiments were carried out at room temperature in a transparent apparatus with a diameter of 172 mm. It was found that for some mixtures it is impossible to determine Umf from the curve of the pressure drop in the bed on fluid velocity. On the other hand, the method of determining Umf from the relationship between standard deviation of pressure measurements and fluid velocity allows this to be done for all studied beds.
A STUDY ON APPLICABILITY OF AUTOMATED PROJECT MANAGEMENT SYSTEMS AT SHIPBUILDING PLANTS WITH A SINGLE AND SMALL-SCALE PRODUCTION TYPES
Authors: Osipov Oleg N. , Mikheeva Tatyana A.
Published: September 2020

The article deals with the feasibility of application of automated project management systems (ACS) at shipbuilding plants with single and small-scale production types. Currently, there is an intensive complication and increase in the scale of shipbuilding production. Economic and mathematical management methods and information technologies are being introduced into production, which have high speed, logic flexibility, and a significant amount of memory. Information technologies serve as the basis for the development of automated control systems and qualitatively change the management form, significantly increasing its efficiency. However, not all shipbuilding plants have the financial ability to introduce automation into production management, since all automated control system software products are expensive. In addition to purchasing the software, the entire production requires re-equipment.
EVALUATING THE EFFECTIVENESS OF VIBRATION-INSULATING DEVICES USE FOR OUTBOARD MOTORS
Authors: Pokusaev Mikhail N. , Konstantin  , Aleksey
Published: September 2020

Noise generated on the boat hull, as a result of outboard motors vibration, is an urgent problem as it negatively affects the ship's crew and the environment.
THE INSTALLATION FOR THE RESEARCH OF CAVITATION PROCESSES IN COOLING SYSTEMS OF MARINE DIESEL ENGINES
Authors: Bezjukov Oleg K. , Zyukov Vladimir A. , Puljaev Andrej A.
Published: September 2020

The article describes the design of the experimental installation that provides new data on cavitation-erosion failures in high-temperature cooling systems. Based on the analysis of domestic and foreign sources of scientific and technical information concerning the research of cavitation processes, technical objects where cavitation processes take place, factors that affect the intensity of cavitation-corrosion destruction, and methods that are used for cavitation research are identified. A modernized design of the laboratory unit is proposed. The main element of it is a high-frequency magnetostrictive vibrator. Due to the sealed experimental cavity, the unit allows the determining of the intensity of cavitation-erosion destruction at high liquid temperatures and pressure above atmospheric, which is typical for high-temperature cooling of marine diesels. The usage of the installation will allow getting the correct data about the resource of elements of high-temperature cooling systems for marine diesels.
INVESTIGATION OF MORPHOLOGICAL FEATURES OF FILM POLLUTION ON WATER SURFACE BASED ON RADAR SENSING DATA
Authors: Ermoshkin Alexey V. , Kapustin Ivan A. , Danilicheva Olga A. , Poplavsky Eugene I. , Rusakov Nikita S.
Published: September 2020

The article deals with the morphological features of spreading films of surfactants on the surface of the reservoir on the basis of experiments on the Gorky reservoir under various meteorological conditions. The test substances were: oleic acid, vegetable oil, diesel. The registration of film contamination was carried out using X-band digital coherent radar MRS-1000, located on the roof of the lighthouse at the end of the outside harbor. The processing of the obtained radar panoramas made it possible to establish that the physical properties of the pollutant are reflected in the morphological characteristics of the film slicks. In particular, the substance properties are manifested in relation of the slick axes along and across the wind direction, as well as in the effects of growth and saturation of the slick area, all other things being equal. Without claiming to be a method for identifying a substance based on the data obtained, we can conclude that these effects are present and that they can be observed using radar methods.
Pharmacologic Treatment of Hypertension in Adults Aged 60 Years or Older from the American College of Physicians and the American Academy of Family Physicians
Authors: Pinashin Eric , Stern Craig
Published: September 2020

An elevation in systolic and diastolic blood pressure, known as hypertension, is characterized as a condition where blood pressure values are above the normal values, ranging around 120/80mmHg for most adults. There are two forms of hypertension, primary hypertension and secondary hypertension. Primary or essential hypertension accounts for 90–95% of patients with hypertension, with its etiology unknown, while secondary hypertension accounts for 5–10% of the population, due to chronic kidney disease, endocrine disorders, or usage of ibuprofen or venlafaxine.(1)

If left untreated, hypertension can lead to heart attack, stroke, heart failure, vision problems, kidney damage, and a variety of other problems, depending on which vessels it affects. As seen in Figure 1, either having low or high systolic or diastolic blood pressure can be detrimental to one's health. Having low blood pressure can lead to hypoperfusion of vital organs, whereas elevated blood pressure can lead to end organ damage, stroke, and myriad related instances.
Taxonomic revision of the genus Glochidion (Phyllanthaceae) in Taiwan, China
Authors: Yao Gang , Song Zhu-Qiu , Xue Bin-E , Shi Shi , Li Yu-Ling , Luo Shi-Xiao
Published: September 2020

A comprehensive taxonomic revision of the genus Glochidion J.R. Forst. & G. Forst. from Taiwan in China was carried out based on the examination of herbarium specimens and filed investigations. Eight species and three varieties are recognized, including a new species endemic to Taiwan, G. lanyuense Gang Yao & S.X. Luo, which is described and illustrated. Three names, viz. G. chademenosocarpum Hayata, G. kusukusense Hayata, and G. ovalifolium F.Y. Lu & Y.S. Hsu, are reduced to the new synonyms of G. rubrum Blume, G. lanceolatum Hayata, and G. ellipticum Wight, respectively. Two names, viz. G. lanceolatum Hayata and G. suishaense Hayata, are lectotypified here. A key to the Glochidion species in Taiwan is provided.
Immunization with Mycobacterium tuberculosis–Specific Antigens Bypasses T Cell Differentiation from Prior Bacillus Calmette–Guérin Vaccination and Improves Protection in Mice
Authors: Aagaard Claus , Knudsen Niels Peter Hell , Sohn Iben , Izzo Angelo A. , Kim Hongmin , Kristiansen Emma Holsey , Lindenstrøm Thomas , Agger Else Marie , Rasmussen Michael , Shin Sung Jae , Rosenkrands Ida , Andersen Peter , Mortensen Rasmus
Published: September 2020

Despite the fact that the majority of people in tuberculosis (TB)–endemic areas are vaccinated with the Bacillus Calmette–Guérin (BCG) vaccine, TB remains the leading infectious cause of death. Data from both animal models and humans show that BCG and subunit vaccines induce T cells of different phenotypes, and little is known about how BCG priming influences subsequent booster vaccines. To test this, we designed a novel Mycobacterium tuberculosis–specific (or “non-BCG”) subunit vaccine with protective efficacy in both mice and guinea pigs and compared it to a known BCG boosting vaccine. In naive mice, this M. tuberculosis–specific vaccine induced similar protection compared with the BCG boosting vaccine. However, in BCG-primed animals, only the M. tuberculosis–specific vaccine added significantly to the BCG-induced protection. This correlated with the priming of T cells with a lower degree of differentiation and improved lung-homing capacity. These results have implications for TB vaccine design.
Antibody Responses to SARS-CoV-2: Let’s Stick to Known Knowns
Authors: Baumgarth Nicole , Nikolich-Žugich Janko , Lee F. Eun-Hyung , Bhattacharya Deepta
Published: September 2020

The scale of the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) pandemic has thrust immunology into the public spotlight in unprecedented ways. In this article, which is part opinion piece and part review, we argue that the normal cadence by which we discuss science with our colleagues failed to properly convey likelihoods of the immune response to SARS-CoV-2 to the public and the media. As a result, biologically implausible outcomes were given equal weight as the principles set by decades of viral immunology. Unsurprisingly, questionable results and alarmist news media articles have filled the void. We suggest an emphasis on setting expectations based on prior findings while avoiding the overused approach of assuming nothing. After reviewing Ab-mediated immunity after coronavirus and other acute viral infections, we posit that, with few exceptions, the development of protective humoral immunity of more than a year is the norm. Immunity to SARS-CoV-2 is likely to follow the same pattern.
Psychometric of the Curiosity and Exploration Inventory-Ii in Indonesia
Authors: Setyowati Anggi , Chung Min-Huey , Yusuf Ah. , Haksama Setya
Published: September 2020

Background

Curiosity is a personality characteristic, which fits with wellbeing and positive functioning. The objective of this study was to assess the construct validity of the Curiosity and Exploration Inventory II (CEI-II) in Indonesia.

Design and methods

The study included 256 undergraduate students who lived in Indonesia, mean age 19.8 years old. The CEI-II measures stretching and embracing using 11 items. The English version of CEI-II was translated into Bahasa. The Cronbach's alpha coefficient and intraclass correlation coefficient (ICC) were addressed to examine internal consistency reliability and the test-retest reliability. To evaluate construct validity, exploratory factor analysis (EFA) was used to assess factor structure and confirmatory factor analysis (CFA) was used to evaluate the structural model fit of the CEI-II Indonesia version.

Results

The study showed Cronbach's alpha for the internal consistency of the overall CEI-II Indonesia version was 0.77. The ICC for the test-retest reliability ranged between 0.753-0.829. EFA showed adequate with the Kaiser-Meyer-Olkin value of 0.86 and the Bartlett's test of sphericity was statistically significant. CFA tested the second-order model with two-order factors and showed a model fit.

Conclusions

The CEI-II Indonesia version indicated acceptable construct validity to evaluate curiosity in Indonesia.
Mauro Bartolo and Franco Pratesi
Authors: Allegra Claudio
Published: September 2020

This paper is part of the monographic issue: ‘Did the Masters of the past know the future? History and update of Italian Phlebolymphology’ 

Guest editor: Alberto Macciò (Phlebology - Part I edited by G. Agus; Phlebology - Part II edited by P. Bonadeo; Lymphology edited by F. Boccardo)
Sergio Bertini Curri
Authors: Oliva Enrico
Published: September 2020

This paper is part of the monographic issue: ‘Did the Masters of the past know the future? History and update of Italian Phlebolymphology’

Guest editor: Alberto Macciò (Phlebology - Part I edited by G. Agus; Phlebology - Part II edited by P. Bonadeo; Lymphology edited by F. Boccardo)
Contributions from the youngest
Authors: Campisi Corrado , Dessalvi Sara , Ferrari Valentina , Gazzabin Luca , Martignon Martina , Pisano Marco , Pisoni Maurizio , Serantoni Simone , Stasi Elodie , Tessari Mirko
Published: September 2020

This paper is part of the monographic issue: ‘Did the Masters of the past know the future? History and update of Italian Phlebolymphology’

Guest editor: Alberto Macciò (Phlebology - Part I edited by G. Agus; Phlebology - Part II edited by P. Bonadeo; Lymphology edited by F. Boccardo)
Pooled testing for COVID-19 diagnosis by real-time RT-PCR
Authors: Praharaj Ira , Jain Amita , Singh Mini , Balakrishnan Anukumar , Dhodapkar Rahul , Borkakoty Biswajyoti , Ashok Munivenkatappa , Das Pradeep , Biswas Debasis , Kalawat Usha , Turuk Jyotirmayee , Sugunan A.P. , Prakash Shantanu , Singh Anirudh K. , Barathidasan Rajamani , Subhadra Subhra , Sabat Jyotsnamayee , Manjunath M.J. , Kanta Poonam , Mudhigeti Nagaraja , Hazarika Rahul , Mishra Hricha , Abhishek Kumar , Santhalembi C. , Dikhit Manas Ranjan , Vijay Neetu , Narayan Jitendra , Kaur Harmanmeet , Giri Sidhartha , Gupta Nivedita
Published: September 2020

Background & objectives:

Public health and diagnostic laboratories are facing huge sample loads for COVID-19 diagnosis by real-time reverse transcription-polymerase chain reaction (RT-PCR). High sensitivity of optimized real-time RT-PCR assays makes pooled testing a potentially efficient strategy for resource utilization when positivity rates for particular regions or groups of individuals are low. We report here a comparative analysis of pooled testing for 5- and 10-sample pools by real-time RT-PCR across 10 COVID-19 testing laboratories in India.

Methods:

Ten virus research and diagnostic laboratories (VRDLs) testing for COVID-19 by real-time RT-PCR participated in this evaluation. At each laboratory, 100 nasopharyngeal swab samples including 10 positive samples were used to create 5- and 10-sample pools with one positive sample in each pool. RNA extraction and real-time RT-PCR for SARS-CoV-2-specific E gene target were performed for individual positive samples as well as pooled samples. Concordance between individual sample testing and testing in the 5- or 10-sample pools was calculated, and the variation across sites and by sample cycle threshold (Ct) values was analyzed.

Results:

A total of 110 each of 5- and 10-sample pools were evaluated. Concordance between the 5-sample pool and individual sample testing was 100 per cent in the Ct value ≤30 cycles and 95.5 per cent for Ct values ≤33 cycles. Overall concordance between the 5-sample pooled and individual sample testing was 88 per cent while that between 10-sample pool and individual sample testing was 66 per cent. Although the concordance rates for both the 5- and 10-sample pooled testing varied across laboratories, yet for samples with Ct values ≤33 cycles, the concordance was ≥90 per cent across all laboratories for the 5-sample pools.

Interpretation & conclusions:

Results from this multi-site assessment suggest that pooling five samples for SARS-CoV-2 detection by real-time RT-PCR may be an acceptable strategy without much loss of sensitivity even for low viral loads, while with 10-sample pools, there may be considerably higher numbers of false negatives. However, testing laboratories should perform validations with the specific RNA extraction and RT-PCR kits in use at their centres before initiating pooled testing.
Responding to the COVID-19 pandemic in Ghana
Authors: Kenu Ernest , Frimpong Joseph , Koram Kwadwo
Published: September 2020

On 12 January 2020, the World Health Organization (WHO) confirmed that a novel coronavirus was the cause of a respiratory illness in a cluster of people in Wuhan City, Hubei Province, China. The disease was christened COVID-19 and the pathogen (an RNA virus) identified as SARS-Coronavirus-2 (SARS-CoV-2).1,2

The virus is primarily spread through contact with small droplets produced from coughing, sneezing, or talking by an infected person. While a substantial proportion of infected individuals may remain asymptomatic, the most common symptoms in clinical cases include, fever, cough, acute respiratory distress, fatigue, and failure to resolve over 3 to 5 days of antibiotic treatment. Complications may include pneumonia and acute respiratory distress syndrome.3

Over five million confirmed cases of COVID-19 has been recorded globally with more than 300,000 deaths as at 25th May 2020. The United States of America has recorded the highest number of cases with more than 1.5 million and over 100,000 deaths.4

In Africa, more than 90,0000 cases have been reported with about 3,000 deaths. South Africa has recorded the highest number of cases with 23,615 cases and 481 deaths. Ghana confirmed its first cases of COVID-19 on 12th March 2020 and had as at 25 May 2020 recorded over 7,000 cases with 34 deaths.5
Pseudotumour presentation of pulmonary tuberculosis
Authors: Afriyie-Mensah Jane , Awindaogo Felix , Asomani Samuel
Published: September 2020

Pulmonary tuberculosis manifesting as a mass lesion, thus, mimicking a lung carcinoma is an unusual radiographic presentation of tuberculosis (TB). The common radiologic patterns and clinical presentations are well known and documented. We report two cases of pulmonary tuberculosis with a neoplastic appearance on chest imaging diagnosed histologically. A 21 – year old female with cough, weight loss, anorexia and an unremarkable physical examination. Chest radiography showed a right apical mass suggestive of lung cancer. Histology of the lesion revealed parenchymal pulmonary tuberculosis. A 49–year old male with left-sided chest pain, cough, anorexia, weight loss, mild pallor with an unremarkable chest examination. Chest imaging showed a left apical mass and mediastinal lymphadenopathy. Microscopic examination of the mass confirmed pulmonary tuberculosis. Pseudotumour pulmonary tuberculosis is a rare clinical entity that can lead to diagnostic challenges and must be considered in the differential diagnosis when mass lesions are seen on chest imaging, especially in TB endemic areas.Keywords: tuberculosis, pulmonary, carcinoma, atypical, diagnosticFunding: None declared
Professor Jacob Plange-Rhule
Authors: Ofori-Adjei David
Published: September 2020

The usual quiet morning of Good Friday, April 10, 2020, was shattered by the spreading news of the death of Professor Jacob Plange-Rhule. For many persons the news elicited sentiments of grief and outpouring of statements on the good natureof the third Rector of the Ghana College of Physicians and Surgeons. Even though he died at the age of 62 years, his footprints will remain in several places where his feet hath trod in academia, medical education, medical ‘politics’, golf andfamily life.