bluuebunny/crossref_metadata_2025 huggingface dataset:
La “fotografía” más antigua, ‘El rapto de Perséfone’
Authors: Bodó Miháy
Published: June 2021

El ensayo se centra en El rapto de Perséfone, pintura mural de la Tumba I de Vergina, y forma parte de una investigación más amplia en que me he propuesto analizar las estructuras pictóricas de las escasas obras griegas que se han conservado y llegado a nuestros días. Mediante la reconstrucción de los procesos de creación artística, el artículo intenta desvelar los conocimientos del oficio de pintar de la época. Los resultados del análisis permiten demostrar que fueron los talleres helenos los que pusieron las bases de las herramientas de comunicación visual que más utilizamos actualmente, como también la representación de la forma, de la luz y de la sombra, del espacio e incluso el uso de la perspectiva lineal. El texto se dirige tanto a los especialistas en el tema como a un público más amplio. Las imágenes gráficas elaboradas por el autor facilitan la comprensión del alto nivel pictórico de la obra.
Nota preliminare sui resti del ponte sul torrente Lavella, lungo la via Herculia in Hirpinia
Authors: Guacci Paola
Published: June 2021

Il contributo vuole presentare alcune considerazioni preliminari inerenti i resti inediti di un ponte individuato lungo il tratto irpino della via Herculia, in località Difesa Grande di Ariano Irpino (AV). Le strutture rilevabili sul torrente Lavella, affluente del Cervaro, si riferiscono ai resti del pilone occidentale e a pochi lacerti della spalla orientale. Si trattava di un ponte ad arcata unica, modesto nelle dimensioni ma sufficiente a superare il piccolo corso d’acqua. Le attività di ricerca qui presentate hanno, quindi, avuto l’obiettivo di documentare i resti di un ponte mai osservato sul campo e di valutare, al contempo, lo stato di conservazione delle strutture. In attesa di futuri approfondimenti, le evidenze descritte in questo lavoro potrebbero rappresentare un ulteriore caposaldo nella ricostruzione della via Herculia in Hirpinia.
Manuel Martín Nieto, la última serie de Crucificados de tamaño natural de la escultura sevillana, 2000-2020
Authors: Luque Teruel Andrés
Published: June 2021

El artículo identifica y analiza los catorce Crucificados de tamaño natural tallados por el escultor Manuel Martín Nieto, natural y establecido en Morón de la Frontera, en la provincia de Sevilla, en el período comprendido entre los años 2000 y 2020. Estas esculturas forman una serie amplia, hasta ahora inédita en la bibliografía artística, en la que se pueden deducir las claves creativas y la evolución artística del autor. Igualmente hay que considerar que al menos seis de estas representaciones se encuentran entre las obras claves de la producción religiosa andaluza de las dos primeras décadas del siglo XXI, por lo que es necesario darlas a conocer haciendo las valoraciones oportunas.
EFEKTIVITASPELVIC ROCKING EXERCISE PADA IBU BERSALIN KALA I TERHADAP KEMAJUAN DAN LAMA PERSALINAN
Authors: Wulandari RR. Catur Leny , Wahyuni Sri
Published: June 2021

Pendahuluan. Proses kemajuan persalinan kala I fase aktif pada primigravida dipengaruhi oleh dilatasiservik dan penurunan kepala janin kedasar panggul. Pelvic rocking merupakan cara untuk mempercepatproses persalinan yaitu dengan menggerakan panggul searah putaran selama kontraksi berlangsung.Mengayunkan dan menggoyangkan panggul kearah depan dan ke belakang, sisi kanan kiri dan melingkarakan terasa lebih relaks dan mempermudah membukanya jalan lahir pada waktu persalinan. Tujuandari penelitian ini adalah mengetahui efektifitas pelvic rockingterhadap lamanya persalinankala Ifase aktif dan lama Kala II. Metode. Penelitian ini merupakan penelitian kuantitatif dengan rancangan quasi experiment, yaitu post testonly design. Penelitian dilakukan di RSUD Ungaran yang telah memberikan intervensi pelvic rockingpadaibu bersalin dengan jumlah responden 28 orang selama bulan September 2018 sampai dengan Desember2018 (14 pada kelompok intervensi dan 14 pada kelompok kontrol). Teknik sampling dengan consecutivesampling. Analisa dengan chi square. Instrumen yang digunakan adalah lembar observasi yang dilakukanoleh Bidan di RSUD Ungaran. Hasil Penelitian.Ada hubungan antara Pelvick Rocking Exercisedengan lama kala I dengan p value 0,008(<0,05) dan ada hubungan antara Pelvick Rocking Exercise dengan lama Kala II dengan p value0,007(<0,05). Ibu bersalin Kala I yang melakukan PRE dapat mempercepat kemajuan dan lama persalinan.Kata Kunci: Lamakala I fase aktif ,lama kala II, pelvic rocking
HUBUNGAN ANTARA UMUR, POLIHIDRAMNION DENGAN KEJADIAN PERDARAHAN POSTPARTUM DI RSI SULTAN AGUNG SEMARANG
Authors: Surani Endang , Wahyuni Sri
Published: June 2021

Pendahuluan. Jumlah kasus kematian ibu di Provinsi Jawa Tengah pada tahun 201 7sebanyak475 kasus, mengalami penurunan dibandingkan jumlah kasus kematian ibu tahun 201 6 yangsebanyak 602kasus.Penyebab kematian ibu yang terbesar kedua di Jawa Tengah sebesar 21,23% disebabkan karena perdarahan. Perdarahan post partum merupakan sangat berhubungandengan kesehatan ibu yang dapat menyebabkan kematian. Data yang didapatkan di RSI SultanAgung Semarang menunjukkan angka kejadian perdarahan postpartum pada tahun 2016-2017sebanyak 73 kasus.Tujuan.Untuk mengetahui hubungan antara umur dan paritas kejadian perdarahan postpartumdi RSI Sultan Agung Semarang tahun 2016-2017.Metode Penelitia. Jenis penelitian ini desktiptif analitik dengan pendekatan case control.Populasi yaitu semua ibu bersalin yang mengalami perdarahan dan tidak perdarahan. Sampelkasus berjumlah 73 responden dengan teknik pengambilan sampel total sampling dan sampelkontrol berjumlah 73 responden dengan teknik pengambilan simple random sampling. Ujistatistik yang digunakan Chi-Square, Odds Ratio.Kesimpulan. Berdasarkan analisis bivariate didapatkan bahwa ada pengaruh antara umurberisiko (OR=2,49, p=0,000), polihidramnion (OR =0,191, p= 0,000)dengan perdarahanpostpartum. Disarankan ibu hamil rutin memeriksakan kehamilannya agar segera terdeteksi apabilamengalami polihidramnion.Disarankan agar para ibu hamil dengan kriteria umur berisiko untukwapada terhadap kejadian perdarahan post partum. Kata Kunci : Perdarahan post partum, umur, polihidramnion
PENGARUH PENGGUNAAN KINESIO TAPPING TERHADAP INTENSITAS NYERI PUNGGUNG PADA IBU HAMIL TRIMESTER III
Authors: S Suyani
Published: June 2021

Pendahuluan. Nyeri punggung pada ibu hamil bisa disebabkan karena perubahan hormonal yang menimbulkan perubahan pada jaringan lunak penyangga dan penghubung sehingga menurunnya elastisitas dan fleksibilitas otot. Sekitar 50-72% dari ibu hamil yang mengalami nyeri punggung bawah akan meningkat seiring bertambahnya usia kehamilanya. Rumusan masalah pada penelitian ini adakah pengaruh kinesio tapping terhadap nyeri punggung pada ibu hamil. Tujuan. Penelitian ini bertujuan untuk mengetahui pengaruh penggunaan kinesio tapping terhadap intensitas nyeri punggung pda ibu hamil trimester III di Puskesmas Gamping I Yogyakarta. Metode. Metode penelitian menggunakan Quasi Experimental dengan desain penelitian non equievalent pre dan post test control group design secara kuantitatif dilakukan pada 30 responden yang merupakan ibu hamil trimester III di Puskesmas Gamping I Yogyakarta serta dibagi menjadi 2 kelompok yaitu 15 responden kelompok perlakuan dan 15 responden kelompok kontrol. Hasil. Hasil analisis uji T didapatkan nilai p value 0,047< 0,05 sehingga hasil penelitian dapat disimpulkan terdapat pengaruh penggunaan kinesio tapping terhadap intensitas nyeri punggung pada ibu hamil trimsester III di Puskesmas Gamping I Yogyakarta. Kesimpulan. Hendaknya penelitian ini dapat dijadikan suatu intervensi non farmakologi untuk melakukan penatalaksanaan pada ibu hamil trimester III dengan nyeri punggung.

 

Kata Kunci: kehamilan, kinesio tapping, nyeri punggung
What We Do When We #PrayFor: Communicating Posthumanitarian Solidarity Through #PrayForMarawi
Authors: Crisostomo Junesse
Published: June 2021

When Islamic State-inspired extremists laid siege in Marawi City, #PrayForMarawi circulated across various social media platforms. Using Kenneth Burke’s Guilt-redemption rhetoric as framework, how was solidarity communicated through #PrayForMarawi tweets? #PrayForMarawi frames the terrorist siege as the source of guilt which destroyed our upholding of cosmopolitan values. Mortification in the form of self-sacrifice is performed through the announcement of acts of prayer online while victimage is communicated by offering up ISIS as the tragic scapegoat that needs to be banished. Through this framing of the situation, the liberation of the city becomes the “amen” of the online prayer utterance, transporting socio-political events onto the realm of divine intervention. The liberation of Marawi was the ultimate purging of guilt in #PrayForMarawi. However, two years after the liberation of Marawi, no hashtags of solidarity are trending for the 100,000 Marawi residents who are still displaced and homeless. Some of the residents have even expressed their frustration and impatience toward the government’s broken promises of rehabilitation. Because of the redemption acknowledged in the answered prayers of liberation of #PrayForMarawi, a post-humanitarian solidarity of “mass self-communication” purified our individual guilt while failing to provide a collective and sustained commitment for justice towards the suffering of others.
Ang Pagpápatawá Bilang Kritika: Isang Pagsusuri sa Kritisismo ng/sa Seryeng Kung Puwede Lang (KPL) ng Facebook page na VinCentiments
Authors: Concha Christopher Bryan , Autor Mariz
Published: June 2021

VinCentiments is the Facebook page behind the viral short films, such as Kung Pwede Lang (KPL), a 4-minute video that features a student who is complaining to her teacher. This video reached more than 16 million views. VinCentiments usually tackles social issues in a comical and parody way. Using Rhoderick Nuncio’s concept of Pantawang Pananaw (2002), this paper explored the criticisms that transcends in their short films. The analysis was limited in the chosen short films that are included in the KPL series which were posted from June to December 2018: (a) KPL; (b) Resbak Kakak ni Mam; (c) BOSSABOS; (d) The OFW Rant.
REINFORCEMENT OF RUBBER BY CARBON BLACK AND LIGNIN-COATED NANOCELLULOSE FIBRILS
Authors: Tunnicliffe Lewis B. , Nelson Kimberly , Pan Shaobo , Curtis John , Herd Charles R.
Published: June 2021

The reinforcement of rubber by a co-filler system of carbon black and lignin-coated nanocellulose fibrils (LCNF) is investigated. Natural rubber (NR)–polybutadiene (BR) blend compounds containing LCNF loadings of up to 20% of the total filler package are prepared, and the dispersion state of the LCNF is determined using interferometric and electron microscopy. The LCNF is found to be well dispersed on macro- and micro-dispersion length scales, with discrete fibrils tending to align in the milling/calendering grain direction. Cure properties—scorch, rate, and total yield of crosslinks—are unaffected by the presence of LCNF in the compounds. Tensile to break and cyclic tensile properties are found to be reasonably consistent with those of a conventional all carbon black control compound. Tear and laboratory abrasion resistance properties are maintained versus the control compound, while a systematic and substantial reduction in compound Payne Effect with increasing LCNF content is observed. Basic aging properties of the compounds are unaffected by the presence of LCNF. The potential benefits of LCNF as a lightweight, sustainable, and bio-derived reinforcing filler are outlined.
IMPROVEMENT OF SILICA-REINFORCED NATURAL RUBBER TIRE TREAD COMPOUNDS BY JOINT HYBRIDIZATION WITH SMALL AMOUNTS OF SECONDARY FILLERS AND POLYMERS
Authors: Sattayanurak S. , Sahakaro K. , Kaewsakul W. , Dierkes W. K. , Reuvekamp L. A. E. M. , Blume A. , Noordermeer J. W. M.
Published: June 2021

To improve the properties of silica-reinforced truck tire tread compounds, especially abrasion resistance, the effect of vinyl contents in butadiene rubber (BR) or solution styrene–butadiene rubber (SSBR) as secondary polymers in silica-filled natural rubber (NR) compounds at a ratio of 80/20 phr is investigated in the first part of this study. By increasing the levels of vinyl contents in BR in combination with NR, a better Payne effect, 300% modulus, reinforcement index, and tan delta at −20 and 0 ° C are obtained, whereas the tensile strength, elongation at break, and DIN abrasion resistance index decrease with increasing vinyl contents. Higher vinyl contents in SSBR result in improvements in Payne effect, 300% modulus, tan delta at −20 and 0 °C but only a small improvement in DIN abrasion resistance index. Combinations of secondary fillers and polymers in silica-filled NR are covered in the second part of present study. Silica/carbon black–filled NR/BR and NR/SSBR, respectively, and silica/organoclay–filled NR/BR and NR/SSBR show positive effects on scorch time and optimum cure time, with only slight changes in Payne effect, tensile properties, tan delta at −20 and 0 ° C and DIN abrasion resistance as compared with compounds with carbon black N134. The use of organoclay results in an enhanced Payne effect and tan delta at 60 °C, indicative of reduced filler–filler networking and consequently a lower rolling resistance of tire tread compounds as compared with the compound without organoclay. The specific combination of a small amount of organoclay replacing the same amount of silica, together with some of the NR replaced by high-vinyl BR, promises a substantial overall boost in wet and ice traction, abrasion, and wear resistance as compared with straight NR/silica tire treads. This new observation helps to overcome one of the main shortcomings of NR/silica compounds: their generally low wear resistance.
DERIVATIZATION OF SOYBEAN OIL TO ENHANCE PERFORMANCE AS A PROCESSING OIL IN SBR-BASED RUBBER COMPOUNDS
Authors: Shafranska Olena , Chernykh Andrey , Chisholm Bret J. , Tarnavchyk Ihor , Webster Dean C.
Published: June 2021

Although soybean oil (SBO) has been used as a bio-based processing oil (PO) for rubber compounds, direct replacement of a conventional petroleum-based PO with SBO often results in a reduction of some important properties. As a result, it was of interest to investigate two higher molecular weight SBO-derived materials as POs, namely, sucrose octasoyate (SS) and poly(2-vinyloxyethyl)soyate (P2VOES). When these compounds were used in carbon black (CB)-filled SBR, mechanical properties were significantly improved. This result was mainly attributed to higher crosslink densities resulting from their higher degree of unsaturation per molecule as compared with SBO. Higher unsaturation per molecule increases the probability that the PO will be incorporated into the crosslinked network as elastically effective crosslinks as opposed to dangling chain ends. With regard to tire tread performance, both SS and P2VOES-based vulcanizates showed a lower predicted rolling resistance than the SBO-based control, and the P2VOES vulcanizate showed a better balance between rolling resistance and wet traction. Vulcanizates derived from SS and P2VOES showed a small tangent delta peak between −13 and 35 °C that might be associated with relatively highly crosslinked domains rich in SS or P2VOES.
CHARACTERIZING THE HYDROGEN TRANSPORT PROPERTIES OF RUBBERY POLYMERS BY GRAVIMETRIC ANALYSIS
Authors: Jung Jae Kap , Kim In Gyoo , Jeon Sang Koo , Chung Ki Soo
Published: June 2021

We develop an ex situ technique to quantitatively analyze the transport properties of hydrogen gas dissolved under high pressure in rubbery polymers, such as cylindrical and spherical samples of nitrile butadiene rubber (NBR), ethylene propylene diene monomer (EPDM), and fluoroelastomer (FKM), which are potential sealing materials for hydrogen energy infrastructures. The technique consists of real-time gravimetric measurements during the desorption of hydrogen gas from samples using an electronic balance and a self-developed analysis program to determine the total charge (CH0), diffusivity (D), solubility (S) and permeability (P) of hydrogen. Dual absorption behavior is found for all three rubbers as the charging pressure increases. CH0 follows Henry's law at low pressures of up to ∼25 MPa, whereas the Langmuir model applies at high pressures. No significant pressure, size, or shape dependences are observed for D and P. The measured P values are consistent with those from the literature within the combined uncertainty evaluated. The effect of a carbon black filler mixed into rubber is discussed with respect to S and D. This method can be applicable as a standard test for the transport properties versus the pressure of various polymers irrespective of sample shape.
THIXOTROPIC FLOCCULATION EFFECTS IN CARBON BLACK–REINFORCED RUBBER: KINETICS AND THERMAL ACTIVATION
Authors: Tunnicliffe Lewis B.
Published: June 2021

A new rheological methodology is used to quantify the kinetics and thermal activation of thixotropic recovery (flocculation) of uncrosslinked carbon black–reinforced emulsion SBR following high shears and over a range of annealing temperatures. A wide range of carbon black types are examined to determine the influence of aggregate morphology and surface area on compound flocculation. Several kinetic parameters are correlated with the carbon black aggregate structure and surface area, the results of which imply a transition in mechanisms controlling modulus recovery between shorter and longer recovery time scales. Thermal activation of flocculation is found to scale to the surface area and to the mean aggregate diameter of the carbon blacks following power law relationships. The thermal activation data for a subset of compounds with different carbon blacks prepared at different loadings collapses onto a single master line by rescaling the data to a parameter that is proportional to the theoretical interparticle force calculated for the idealized situation of two spherical particles in proximity. Three different van der Waals force models are evaluated, and in each case, an effective superposition of the thermal activation data is achieved. This indicates that the attractive force between aggregates plays a key role in the flocculation of carbon black in rubber, and this force can be traced back to the aggregate and primary particle sizes, interaggregate distances, and effective volume fractions. The activation energy for the viscosity of the unfilled, uncrosslinked SBR is similar to analogous values calculated for the thermal activation of flocculation. This coupling of energetics may be the result of creep/flow of rubber out of gaps between aggregates resulting from interaggregate attractive forces and any potential diffusive motion of the aggregates. Bound rubber data appear to contain information relating to aggregate packing, which could be exploited in future work to further explore the mechanism of flocculation.
POTENTIAL SUSTAINABLE ANTIOXIDANTS FOR NATURAL RUBBER: HENNA AND ITS MAJOR COMPONENTS
Authors: Öncel Şehriban , Wis Abdulmounem Alchekh , Karaağaç Bağdagül
Published: June 2021

Unsaturated chain structure of natural rubber makes it a poor defense against thermo-oxidative aging. Synthetic antioxidants are commonly used in rubber compound recipes to prevent/retard aging of the rubber material during its service life. However, synthetic antioxidants cause some negative effects on human and environmental health; they tend to be replaced by natural alternatives. In this study, the short- and long-term antioxidant effects of henna and its basic active components, lawsone and gallic acid, have been investigated individually for natural rubber cured with semi-efficient sulfur vulcanization system. The composition of henna was determined by gas chromatography-mass spectrometry (GC-MS) analysis. Qualitative and quantitative analysis were performed using Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) to highlight structural changes on aged vulcanizates. The authors attempted to correlate the suggested aging mechanism with rheological, mechanical, and morphological properties. Results showed that both lawsone and gallic acid were impressively successful regarding their anti-oxidation activity. In addition, henna, which contains a sufficient amount of lawsone and gallic acid, has been suggested as a competitive natural alternative to the common synthetic stabilization system for natural rubber, considering its sustainable commercial abundancy.
ORIGIN OF ENERGETIC ELASTICITY AND ENTROPIC ELASTICITY OF NATURAL RUBBER WITH NANODIAMOND NANOMATRIX STRUCTURE
Authors: Gannoruwa Asangi , Zhou Yuanbing , Kosugi Kenichiro , Yamamoto Yoshimasa , Kawahara Seiichi
Published: June 2021

The origin of energetic elasticity in conjunction with the entropic elasticity for natural rubber with a nanodiamond nanomatrix structure was investigated in terms of bound rubber formed between nanodiamonds, based on the interaction between natural rubber and nanodiamonds inside the nanomatrix. The natural rubber with a nanodiamond nanomatrix structure was prepared by reacting nanodiamonds with deproteinized natural rubber in the presence of tert-butylhydroperoxide/tetraethylenepentamine at 30 °C in the latex stage followed by drying. Morphology of the products was observed by two-dimensional and three-dimensional transmission electron microscopies. The effect of bound rubber on the mechanical properties of the products was investigated by measurements of the dynamic mechanical properties and differential scanning calorimetry. The contribution of bound rubber was estimated by combining the Takayanagi equation and modified Guth–Gold equation. A significant increase in complex modulus was attributed to the effect of the bound rubber.
INFLUENCE OF MASTICATION ON THE MICROSTRUCTURE AND PHYSICAL PROPERTIES OF RUBBER
Authors: Okamoto Koji , Toh Michiharu , Liang Xiaobin , Nakajima Ken
Published: June 2021

The effects of the masticated state of isoprene rubber (IR) at the carbon black (CB) addition stage on subsequent mixing, microstructure, and physical properties in the case of a kneader with a characteristic large-diameter shaft are investigated by examining the mastication-time dependence. A sufficiently masticated IR shows a shorter black incorporation time, which results in an improved dispersion of CB and better physical properties. Observing the microstructure of a rubber compound using the atomic force microscope–based nanomechanical technique, poor CB dispersion is revealed for insufficient mastication. Specifically, large CB agglomerations surrounded by the interfacial rubber region with higher elastic modulus than that of a rubber matrix are formed. Such a large CB agglomeration, on the other hand, does not appear in rubber compounds with longer mastication times. The thickness of the interfacial region becomes shorter in these cases. These observations are further discussed by the concept of “rheological unit” introduced by Mooney et al. This study demonstrates that the microstructure of a rubber compound is highly heterogenous with rubber regions of different microscopic elastic moduli and that the microstructure has an influence on CB dispersion and the physical properties of rubber.
EFFECTS OF CROSSLINK BOND TYPE OF IIR-BASED WASTE RUBBER POWDER ON THE EPDM-ASSISTED DEVULCANIZATION REACTION
Authors: Xing Zhiyuan , Zhang Ling , Zhang Yuncan , Li Dongxu
Published: June 2021

Isobutylene–isoprene rubber (IIR)–based waste rubber powder (WRP) present in WRP/ethylene–propylene–diene monomer (EPDM) blends was devulcanized through a stress-induced reaction by increasing the screw rotation speed in the presence of subcritical ethanol. The effects of crosslink bond type (which was cured using phenolic resin, sulphur, or zinc oxide) of WRP and the screw rotation speed on devulcanization were investigated. The results showed that the Mooney viscosity and gel content of the devulcanized blends (DWRP/EPDM) decreased with an increase in the screw rotation speed, and the optimal screw rotation speed maximized the molecular weight (Mη) of sols and enhanced the mechanical properties of the revulcanized material. The optimal screw rotation speed for the phenolic resin-cured WRP1 and zinc oxide-cured WRP3 was 500 r min−1 and that for sulphur-cured WRP2 was 300 r min−1. At the optimal screw rotation speed, crosslink bonds severely fractured, and the main chain structure remained relatively intact. The 1H-NMR spectra of the sol in the devulcanized blends (DWRP/EPDM) confirmed that the content of the alpha and double-bond protons of sols are the highest at the optimal screw rotation speed, and many promoting agent (480) molecules penetrate and participate in devulcanization. Scanning electron microscopy images indicated that the size of the unfused gel particles in the mixed-revulcanized materials of IIR/(DWRP1/EPDM), IIR/(DWRP2/EPDM), and BIIR/(DWRP3/EPDM) was the smallest at the optimal screw rotation speed.
NOVEL EPDM/PARAFFIN FOAMS FOR THERMAL ENERGY STORAGE APPLICATIONS
Authors: Valentini Francesco , Dorigato Andrea , Fambri Luca , Pegoretti Alessandro
Published: June 2021

The thermomechanical behavior of ethylene–propylene–diene monomer (EPDM) foams filled with different concentrations of a paraffin (melting temperature of 21 °C) are investigated for the first time. Samples were prepared by melt compounding and hot pressing, and the effects of two different foaming agents such as Expancel® 909DU80 (E) and Hostatron® P0168 (H) were investigated. Scanning electron microscopy and density measurements highlighted that the use of E foaming agent led to foams with a closed-cell morphology and a mean pore size of about 20 μm, whereas foams expanded with H were characterized by a mixed closed-/open-cell porosity with a larger cell size (of about 100 μm) and a less uniform pore distribution. Differential scanning calorimetry analysis demonstrated that the produced foams were endowed with noticeable thermal energy storage properties (up to 67 J/g with a paraffin amount of 50 wt%). The corresponding thermal parameters were found in the range of 15–50 J/cm3, which were directly dependent on the paraffin content in both heating and cooling. The drop in the maximum tensile stress at elevated paraffin contents observed in the tensile impact tests at 23 °C was counterbalanced by a noticeable enhancement of the deformation at break and of the absorbed impact energy. Tensile tests performed at 0 °C demonstrated that the addition of paraffin within the foams was responsible for a substantial increase in stiffness, whereas at 40 °C, it plays a plasticizing effect.
Teachers’ Perception on the Challenges of Utilizing Problem-Based Learning in Teaching Computer Science in Public Senior Secondary Schools in Port Harcourt Metropolis
Authors: C. V. Eunice , U. Gift
Published: June 2021

This study investigated teachers’ perception on the challenges of utilizing Problem-Based Learning in teaching computer science in public senior secondary schools in Port Harcourt Metropolis, Rivers State, Nigeria. This study adopted descriptive research design. Two research questions and hypotheses were formulated to guide this study. The population for the study comprised one hundred (100) computer science teachers in the thirty six (36) public senior secondary schools located in Port Harcourt metropolis of Rivers State. Census sampling procedure was used to obtain one hundred (100) computer science teachers as the sample size due to the manageable size of the entire population. A structured questionnaire titled “Teachers’ Challenges of Utilizing Problem-Based Learning in Teaching Computer Science in Public Senior Secondary Schools in Port Harcourt Metropolis” (CUPOBALETCOS) was used for collection of data. The questionnaire was validated by experts. Pearson Moment Correlation Coefficient was used to determine the reliability of the instrument which gave a value of 0.84. Mean and standard deviation were used to analyse data and test of hypotheses was done with the use of z-test statistics. Results obtained from the findings revealed that the challenges of utilizing the Problem-Based Learning approach in teaching computer science and the aids to the utilization of this approach in teaching computer science were highly perceived by computer science teachers in senior secondary schools in the metropolis of Port Harcourt, Rivers State in Nigeria. Based on the findings, it was recommended that: Professional programmes, in addition to training exercise, need to be carried out frequently to enable teachers to get acquainted with the utilization of innovative teaching approaches and combat the associated challenges. Administrative duties or demands of teachers should be adjusted in order to have enough time for utilization of innovative teaching practices in the classroom. Curriculum for Problem-Based Learning should be fully introduced in the secondary and primary school education, so as to have facilitators who can help students by facilitating the Problem-Based Learning practices in the learning environment.
The impact of analytical CRM on strategic CRM, operational CRM and customer satisfaction: Empirical study on commercial banks
Authors: Almohaimmeed Bader
Published: June 2021

The aim of this study is to identify the effect of the analytical customer relationship management (CRM) on strategic CRM, operational CRM and customer satisfaction. Data collected from a sample consisted of 150 managers of managers in commercial banks using a questionnaire. The results accepted the hypotheses that analytical CRM is positively related to both strategic CRM and operational CRM, which in turn show significant effects on customer satisfaction. Analytical CRM had no significant direct effect on customer satisfaction, but through strategic CRM and operational CRM. Such results indicated that strategic CRM and operational CRM had a full mediation role between the analytical CRM and customer satisfaction. It was concluded based on these results that CRM components, i.e., analytical, strategic and operational CRM are all critical in ensuring customer satisfaction. Therefore, banks should consider all these components in designing their CRM programs.
The influence of supply chain management on competitive advantage and company performance
Authors: Jamaludin Maun
Published: June 2021

At present, the condition of competition in a network is very tight due to rapid technological changes, economic and political stability in Indonesia which is experiencing uncertainty, and the large number of foreign investors entering, as well as new competitors. Companies themselves are required to always innovate in today's increasingly modern era. This competition must be able to create a good network in order to create competitive advantage and company performance in the formation of good Supply Chain Management. This study aims to determine the effect of supply chain management on competitive advantage and company performance. This study will examine supply chain management on competitive advantage and company performance in Small and Medium Enterprises (SMEs) in Bandung City, West Java. In this study, there are several differences from previous research, namely the indicators that will be used in this study. Namely, the measured supply chain management variables are indicators of technology use, supply chain speed, customer satisfaction, supply chain integration and inventory management. The variables of competitive advantage that are measured are the indicators of Price, Quality, and Time to market, and sales growth. Meanwhile, the measured company performance variables are indicators of financial performance and operational performance. The analytical method used in testing the hypothesis is to use Structural Equation Modeling (SEM) with the help of AMOS software version 20. Respondents in this study were 150 respondents in Small and Medium Enterprises (SMEs) in Bandung, West Java. The results of this study indicate that supply chain management has a positive and significant effect on the company's competitive advantage. Competitive advantage has a positive and significant effect on company performance. Supply chain management has a positive and significant effect on company performance. Supply chain management has a positive and significant effect on company performance through competitive advantage.
Implementing a business strategy with supply chain management in a management system and management control to improve the performance of the hotel business
Authors: Tiawon Harin , Supartha I Wayan Gede
Published: June 2021

Supply chain management is very important in improving the business system in the management sector to improve the regional economy. Based on the hotel business strategy at Lovina Beach by implementing e-payments is very important as a transaction tool starting from purchasing needs or marketing systems to the end of room payments and activities to implement the health protocol for the COVID-19 period. The research was conducted at 100 star hotels on Lovina beach Bali, regarding the importance of the main influence of social capital in driving digitalized payment systems and sharing information with microeconomic theory in improving business performance. The results obtained from simple linear quantitative statistical analysis, based on the r-square value of 63.8%, social capital can encourage electronic payments and knowledge sharing can improve hotel business performance in Lovina Beach Bali Indonesia. Research implications for applying social capital, electronic payments, sharing knowledge in improving business performance during the COVID 19 period and making business strategies to increase consumer confidence in hotels on Lovina Beach Bali.
The effect of supply chain and storage management on demand for health services
Authors: Al-Hazmi Nabil Mohemmed
Published: June 2021

This study aims at studying the effectiveness of supply and storage management in light of the determinants of demand for health services in Saudi hospitals in an analytical framework. The survey studies the impact of logistical management of medical materials and its vital role in securing the necessary medical resources and supplies for the health institution. The study adopts the descriptive and analytical approach in order to achieve its goals and test its hypotheses, as the study was applied in the hospitals of Al-Kharj Governorate. The study finds that there was a relationship between the methods of supply and storage applied in Saudi hospitals and the determinants of demand for the health services provided. The study recommends working on developing methods of requesting suppliers, developing methods of storing medicines and medical supplies, and distributing them inside the hospital in accordance with economic standards and making use of computer technologies.
The effect of lean on the operational performance of medium-sized Thai manufacturing companies
Authors: Terdpaopong Kanitsorn , Puapradit Amporn , Malisuwan Ussanee
Published: June 2021

Lean practices appear to have aided organisations in improving their operations, especially manufacturing companies. This paper reports on an in-depth study comparing Thai medium-size manufacturing companies who use Lean with those which have not yet adopted Lean. In this paper the word “Lean” is used to refer to “lean practices” as well as “lean strategies”. Lean methods include just-in-time (JIT), total productive maintenance (TPM), automation, value-stream mapping (VSM), Kaizen, material requirement planning (MRP), Kanban, 5S and waste elimination. Primary data were obtained through questionnaires which were analysed using a number of statistical processes including factor analysis (CFA) and structural equation modelling (SEM). Some 230 medium-sized manufacturing companies were the focal target of this study. Three latent variables, Lean (exogenous variable), product customisation (endogenous) and operational performance (endogenous) are formed in this study. There were 24 parameters and the findings provide further evidence regarding the effects which Lean practices have on product customisation and operational performance of the companies, for example. The methods for analyzing the data favour the proposed structural equation model. The results show that Lean strategies are linked to improved operational performance in the firms which practice them. Management teams in Thai medium-size manufacturing companies which have resisted Lean are encouraged to adopt Lean in order to improve operational performance, particularly in the present economic climate.
Towards a deterministic sustainable cost-effective water supply chain
Authors: Rezazadeh Hassan , Tahmasebi Zahra
Published: June 2021

Managing water resources is one of the most challenging problems in today’s world. There is an immense change in climate change, population growth, and environment, thereby increasing pressures on water resources. Due to future uncertainty and availability of resources, many priorities should be taken into account in the drinking-water system such as environmental impacts, distribution costs and fixed costs. This paper proposes a deterministic mixed-integer linear programming (MILP) model for planning and designing a water supply chain network in order to optimize multi-objective problems. The model considers costs which include fixed and variable costs, in addition, it considers sustainability in terms of environmental viewpoint. The applicability of the model is appraised through a case study whose data gathered from related articles and water and waste company reports in Iran, which consists of five candidate reservoir nodes and four dam nodes besides eleven candidate locations for treatment plants. Thereafter, the proposed model has been coded in GAMS® optimization software. The model could be an expedient tool in order to manage urban water supply chains in a cost-effective and sustainable manner to satisfy water demand at every time period.
The effects of human resource management, customer satisfaction, organizational performance on tourism supply chain management
Authors: Nguyet Tran Minh , Dung Nguyen Van , Trang Tran Thi Thu , Anh Tran Tuan , Duong Nguyen Duc
Published: June 2021

The goal of this research is to investigate the relationship between human resource management and tourism supply chain management, as well as the effects of human resource and tourism supply chain on customer satisfaction and operation performance. The research was carried out in Vietnam at several tourist destinations. The study found 297 viable samples after screening the sample. A Partial Least Squares (PLS) algorithm was used to process the data. The study's findings revealed a link between human resources and supply chain management in the tourism business. Furthermore, the study discovered that human resource management uncertainty had an impact on organizational performance.
Exploring Evidence: A Challenge before Nurses of Today
Authors: Sabu Stephy
Published: June 2021

The review article presents the obstacles and the solutions towards the implementation of Evidence Based Practice among the nurses in India by merging the content and concept from a few set of related articles by the experts and those include 1. K Gitumoni and K Jyasree. The barriers and challenges of conducting nursing research and communicatoing findings into practice. 2. Daphne c duncombe. A study of perceived barriers and faciliattors to implement evidenced based practice. 3. Joan and Warren. A crosssectional study to assess the strength and challenges to implement ebp in nursing. 4. B Mauricio, Implementing evidence based practice: a challenge for the nursing practice. 5. M Neda and B naser. Nurses faculties knowledge and attitude on evidence based practice. The successful utilization of best evidence into practice depends on the knowledge of nurses, understanding the concepts, and its application. There exists various barriers and facilitators as well to the application of EBP among nurses. The practice can be a successful and routine process in an organization only if there could be support, encouragement and recognition by the administration. The health care team in India must provide an indispensible support to eliminate those barriers and facilitate the optimal care through best evidences in the health care facilities. Thus the article comprises a cross cut view on the obstacles in the application of best evidences in the clinical setting.
The dual degree orthopedic surgeon: A survey of the trends, motivations, and perceived value of the master of business administration degree
Authors: Sherman William F. , Clark Sean C. , Wu Victor J. , Bohlen Hunter L. , Lee Olivia C.
Published: June 2021

Orthopedic surgeons are obtaining Master of Business Administration (MBA) degrees at an increasing rate. This study aimed to identify the motivations, trends, and perceived value of the MBA degree for these dual degree surgeons. A total of 157 orthopedic surgeons with both MD and MBA degrees were surveyed with a 19-item questionnaire to identify surgeons’ motivations for obtaining an MBA degree and the perceived value of the degree. A total of 66 responses (42%) were received. Most respondents (89.4%) viewed the MBA degree as either extremely valuable or valuable. Prior to obtaining an MBA, 71.9% of dual degree surgeons dedicated time to administrative duties outside of the clinic. This number increased to 98.4% after receiving an MBA (p < 0.001). With the growing number of surgeons pursuing MBA degrees, there is a decrease in the time spent in the clinical role suggesting that either the non-clinical burden is increasing, or surgeons choose to re-allocate their time. Despite the high direct costs of an MBA, a majority of orthopedic surgeons perceived the MBA degree as a valuable investment they would pursue again.
Frequency, Prevalence, Interaction, and Gender Differences of Six Psychosocial Factors in Patients Presenting to a Psychiatric Emergency Service
Authors: Patterson II James C. , Khalid Ovais , Wakefield Sarah E. , Liegmann Justin K. , Maqsood Saima , Srivastava Rajeev , Allen Elizabeth
Published: June 2021

INTRODUCTION

The psychiatric emergency service (PES) has become an increasingly utilized patient care approach over the past 50 years. Psychosocial factors play an important role in PES utilization and disposition of patients in this environment. PES utilization in our region has increased 450% in the past 18 years, while the population has changed <1%. Our objective was to determine the frequency and relationship between six psychosocial factors in our patients, in comparison to the general population.

METHODS

We completed a retrospective chart review of 160 patients selected at random who utilized the PES during 2009-2010. We looked for historical presence of a broken family, abuse or neglect, substance abuse, legal problems, violence, or incomplete education. We also looked at the relationship of these factors to race and gender.

RESULTS

75% had three or more of the factors measured. In our population, substance abuse and broken family were most prevalent. Females had significantly more abuse or neglect as compared to males, while male subjects had significantly more substance abuse and legal issues than females. The presence of a broken family was strongly associated with abuse or neglect, while violence was associated with incomplete education and legal issues. The prevalence of these factors in our patients was higher than the general population.

CONCLUSION

The average patient presenting to the PES has multiple major psychosocial problems at higher frequencies than the general population. Understanding the relationship between multiple psychosocial factors and increasing PES utilization can direct us towards addressing the problems causing the increase in PES presentation. A planned future prospective study will examine the incidence of these psychosocial factors in patients presenting to the PES as compared to the general population.
COVID-19 pandemic and its psychological impact among healthy Portuguese and Spanish nursing students
Authors: Laranjeira Carlos , Querido Ana , Marques Goreti , Silva Mafalda , Simões Daniela , Gonçalves Luísa , Figueiredo Rita
Published: June 2021

Few studies have explored the impacts of COVID-19 and lockdown on the mental health of undergraduate nursing students. This study aimed: a) to explore perceived stress among undergraduate nursing students in Portugal and Spain during the COVID-19 pandemic outbreak; and b) to analyze several COVID-19 related factors and psychological issues that may be associated with perceived stress. A cross-sectional study was conducted with a convenience sample of Portuguese and Spanish undergraduate nursing students (n=1075). The data gathered included demographic information, questions about COVID-19 related factors, and psychological issues. Data were analyzed using multiple logistic regression with a degree of significance at p<0.05. High perceived stress scores were found in 558 participants (51.9%). Students with high perceived stress most likely had a COVID-19 diagnosis in their household; their household income had been affected by the COVID-19 pandemic; experienced difficulty falling asleep or sleeping all night; consumed junk food in excess; neglected their appearance; felt headaches, stomach aches, and back pain; and lacked the patience or desire to exercise.

Additionally, high perceived stress was negatively associated with life satisfaction. The results provide evidence that infectious diseases, such as COVID-19, may significantly influence mental health. Further research should explore the long-term psychological effects of the COVID-19 pandemic among nursing students.
Sexual Quality of Life in Women with Breast Cancer
Authors: Brajkovic Lovorka , Sladic Petra , Kopilaš Vanja
Published: June 2021

For women with breast cancer, sexual quality of life is one of the most disrupted aspects of life often associated with long-term physical and emotional difficulties. The main goal of this paper is to systematically review the literature to determine the level of sexual quality of life in women with breast cancer considering the individual and combined impact of grade, progression of the disease, type of treatment, body image, degree of depression, and anxiety, self-esteem, and social partner support and to determine whether the perception of the body, level of self-esteem and the presence of depressive and anxiety symptoms differ regarding different types of treatment or the level of partners’ social support. Using the PRISMA method, all found literature published in electronic databases PubMed, EBSCO, and Hrcak were reviewed and resulted in 10 relevant scientific and review papers.

The results showed that women with breast cancer reported disruption in their sexual quality of life. Among the types of treatment, mastectomy and chemotherapy proved to be the most important, while it is not possible to draw clear conclusions about degree and progression of the disease. Disturbed body image, depressive and anxiety symptoms, lower self-esteem, and inadequate social support of the partner are associated with a lower sexual quality of life. The discussion provides detailed explanations of these results and highlights implications for future research.