bluuebunny/crossref_metadata_2025 huggingface dataset:
Assessment of some key indicators of the ecological status of an African freshwater lagoon (Lagoon Aghien, Ivory Coast)
Authors: Koffi Ahoutou Mathias , Yao Djeha Rosine , Kouamé Yao Eric , Quiblier Catherine , Niamen-Ebrottié Julie , Hamlaoui Sahima , Tambosco Kevin , Perrin Jean-Louis , Troussellier Marc , Bernard Cécile , Seguis Luc , Bouvy Marc , Pédron Jacques , Koffi Konan Felix , Humbert Jean-François , Kalpy Coulibaly Julien
Published: May 2021

The supply of drinking water is a vital challenge for the people who live on the African continent, as this continent is experiencing strong demographic growth and therefore increasing water demands. To meet these needs, surface water resources are becoming increasingly mobilized because underground resources are not always available or have already been overexploited. This situation is the case in the region of Abidjan in the Ivory Coast, where the drinking water deficit is a growing problem and it is therefore necessary to mobilize new water resources to ensure the supply of drinking water. Among the potential resources, local managers have identified a freshwater lagoon, Lagoon Aghien, That is in close proximity to the city of Abidjan. With the aim of enhancing knowledge on the ecological functioning of the lagoon and contributing to the assessment of its ability to provide drinking water, several physical and chemical parameters of the water and the phytoplankton community of the lagoon were monitored for 17 months (December 2016-April 2018) at six sampling stations. Our findings show that the lagoon is eutrophic, as evidenced by the high concentrations of total phosphorus (>140 μg L-1), nitrogen (1.36 mg L-1) and average chlorophyll-a (26 to 167 μg L-1) concentrations. The phytoplankton community in the lagoon is dominated by genera typical of eutrophic environments including mixotrophic genera such as Peridinium and by cyanobacteria such as Cylindrospermopsis/Raphidiopsis, Microcystis and Dolichospermum that can potentially produce cyanotoxins. The two rainfall peaks that occur in June and October appeared to be major events in terms of nutrient flows entering the lagoon, and the dynamics of these flows are complex. Significant differences were also found in the nutrient concentrations and to a lesser extent in the phytoplankton communities among the different stations, especially during the rainfall peaks. Overall, these results reveal that the quality of the lagoon’s water is already severely degraded, and this degradation could increase in future years due to increasing urbanization in the watershed. These results therefore raise questions about the potential use of the lagoon as a source of drinking water if measures are not taken very quickly to protect this lagoon from increasing eutrophication and other pollution sources.
The spatial coupling effect between urban street network’s centrality and collection & delivery points: A spatial design network analysis-based study
Authors: Mehmood Muhammad Sajid , Li Gang , Jin Annan , Rehman Adnanul , Wijeratne V. P. I. S. , Zafar Zeeshan , Khan Ahsan Riaz , Khan Fahad Ali
Published: May 2021

The sustainable development of collection and delivery points and urban street network is an important consideration of logistic planners. Urban street networks have a significant impact on collection and delivery points’ location, but the spatial relationship between the centrality of urban street network and collection and delivery points has not been studied using spatial design network analysis. In a multiple centrality assessment model, we used point of interest and street network data to evaluate the location of two types of collection and delivery points and the centrality of streets in Nanjing city, based on four indicators: closeness, betweenness, severance, and efficiency. Then, kernel density estimation and spatial autocorrelation are used to study spatial patterns of distribution and centrality coupling effects of urban street network and collection and delivery points. The results show that the centrality of Nanjing streets has a big influence on the location of the collection and delivery points, and the directions of different types of centrality also vary. The location of the Cainiao Stations are largely related to closeness, followed by betweenness, severance, and efficiency. China Post Stations and street centrality have a weak correlation between efficiency and severance, but no correlation between closeness and betweenness. Our results can help logistics enterprises and urban planners to develop collection and delivery points’ network based on the urban street network.
Virtual triage and outcomes of diabetic foot complications during Covid-19 pandemic: A retro-prospective, observational cohort study
Authors: Rastogi Ashu , Hiteshi Priya , Bhansali A. Anil , Jude Edward B.
Published: May 2021

Aims

Limb and patient outcomes in people with diabetic foot complications including diabetic foot ulcer (DFU) provided virtual triage and personalized video consultations during COVID-19 pandemic are not known.

Methods

Patients with foot complications attending the diabetic foot clinic prior to lockdown who sought teleconsultations during COVID-19 lockdown underwent virtual triage to include clinical history, visual inspection of feet, domiciliary wound care (community nurse assisted dressings) and offloading instructions. The subsequent ulcer, limb and mortality outcomes during the following 24 weeks of COVID-19 lockdown (April-September 2020, group 1) were assessed and compared with those who attended foot clinic during the same period in 2019 (April-September, group 2).

Results

Group 1 included 561 participants with foot complications provided with teleconsultations, median age 57 (51 to 63) years and diabetes duration of 10 (5 to 16) years. Twelve patients with severe DFU were excluded and 549 patients [357 (65%) neuropathic foot, 104 (18.9%) ischemic foot and 88 (16%) chronic Charcot foot with deformities] were evaluated. There were 227 (41.3%) participants with active DFU at start of lockdown, 32 (5.8%) with new onset ulcer during lockdown (47.1%) and 290 patients without ulcers. Group 2 included 650 participants; active foot ulcer was present in 366 patients. Wound closed or reduced in area in 78.4% of participants of group 1 compared to 76.0% (p = 0.318) in group 2. Fourteen (5.4%) patients required amputations [3 major and 11 minor] in group 1 during the study period compared to 6.8% in group 2 (p = 0.191). Twenty-one (3.8%) and 28 (4.3%) patients died (p = 0.532) during 24 weeks of follow up in group 1 and 2, respectively.

Conclusions

Targeted foot-care service through virtual triage and teleconsultations during COVID-19 pandemic for people with foot complications have similar ulcer and limb outcomes compared to face-to-face foot care delivery.
Differential rotational movement and symmetry values of the thoracolumbosacral region in high-level dressage horses when trotting
Authors: MacKechnie-Guire Russell , Pfau Thilo
Published: May 2021

High-level dressage horses regularly perform advanced movements, requiring coordination and force transmission between front and hind limbs across the thoracolumbosacral region. This study aimed at quantifying kinematic differences in dressage horses when ridden in sitting trot–i.e. with additional load applied in the thoracolumbar region–compared with trotting in-hand. Inertial sensors were glued on to the midline of the thoracic (T) and lumbar (L) spine at T5, T13, T18, L3 and middle of the left and right tubera sacrale of ten elite dressage horses (Mean±SD), age 11±1 years, height 1.70±0.10m and body mass 600±24kg; first trotted in-hand, then ridden in sitting trot on an arena surface by four Grand Prix dressage riders. Straight-line motion cycles were analysed using a general linear model (random factor: horse; fixed factor: exercise condition; covariate: stride time, Bonferroni post hoc correction: P<0.05). Differential roll, pitch and yaw angles between adjacent sensors were calculated. In sitting trot, compared to trotting in-hand, there was increased pitch (mean±S.D), (in-hand, 3.9 (0.5°, sitting trot 6.3 (0.3°, P = <0.0001), roll (in-hand, 7.7 (1.1°, sitting trot 11.6 (0.9°, P = 0.003) and heading values (in-hand, 4.2 (0.8), sitting trot 9.5 (0.6°, P = <0.0001) in the caudal thoracic and lumbar region (T18-L3) and a decrease in heading values (in-hand, 7.1 (0.5°, sitting trot 5.2 (0.3°, P = 0.01) in the cranial thoracic region (T5-T13). Kinematics of the caudal thoracic and lumbar spine are influenced by the rider when in sitting trot, whilst lateral bending is reduced in the cranial thoracic region. This biomechanical difference with the addition of a rider, emphasises the importance of observing horses during ridden exercise, when assessing them as part of a loss of performance assessment.
Prevalence and outcomes of co-infection and superinfection with SARS-CoV-2 and other pathogens: A systematic review and meta-analysis
Authors: Musuuza Jackson S. , Watson Lauren , Parmasad Vishala , Putman-Buehler Nathan , Christensen Leslie , Safdar Nasia
Published: May 2021

Introduction

The recovery of other pathogens in patients with SARS-CoV-2 infection has been reported, either at the time of a SARS-CoV-2 infection diagnosis (co-infection) or subsequently (superinfection). However, data on the prevalence, microbiology, and outcomes of co-infection and superinfection are limited. The purpose of this study was to examine the occurrence of co-infections and superinfections and their outcomes among patients with SARS-CoV-2 infection.

Patients and methods

We searched literature databases for studies published from October 1, 2019, through February 8, 2021. We included studies that reported clinical features and outcomes of co-infection or superinfection of SARS-CoV-2 and other pathogens in hospitalized and non-hospitalized patients. We followed PRISMA guidelines, and we registered the protocol with PROSPERO as: CRD42020189763.

Results

Of 6639 articles screened, 118 were included in the random effects meta-analysis. The pooled prevalence of co-infection was 19% (95% confidence interval [CI]: 14%-25%, I2 = 98%) and that of superinfection was 24% (95% CI: 19%-30%). Pooled prevalence of pathogen type stratified by co- or superinfection were: viral co-infections, 10% (95% CI: 6%-14%); viral superinfections, 4% (95% CI: 0%-10%); bacterial co-infections, 8% (95% CI: 5%-11%); bacterial superinfections, 20% (95% CI: 13%-28%); fungal co-infections, 4% (95% CI: 2%-7%); and fungal superinfections, 8% (95% CI: 4%-13%). Patients with a co-infection or superinfection had higher odds of dying than those who only had SARS-CoV-2 infection (odds ratio = 3.31, 95% CI: 1.82–5.99). Compared to those with co-infections, patients with superinfections had a higher prevalence of mechanical ventilation (45% [95% CI: 33%-58%] vs. 10% [95% CI: 5%-16%]), but patients with co-infections had a greater average length of hospital stay than those with superinfections (mean = 29.0 days, standard deviation [SD] = 6.7 vs. mean = 16 days, SD = 6.2, respectively).

Conclusions

Our study showed that as many as 19% of patients with COVID-19 have co-infections and 24% have superinfections. The presence of either co-infection or superinfection was associated with poor outcomes, including increased mortality. Our findings support the need for diagnostic testing to identify and treat co-occurring respiratory infections among patients with SARS-CoV-2 infection.
Political optimizer with interpolation strategy for global optimization
Authors: Zhu Aijun , Gu Zhanqi , Hu Cong , Niu Junhao , Xu Chuanpei , Li Zhi
Published: May 2021

Political optimizer (PO) is a relatively state-of-the-art meta-heuristic optimization technique for global optimization problems, as well as real-world engineering optimization, which mimics the multi-staged process of politics in human society. However, due to a greedy strategy during the election phase, and an inappropriate balance of global exploration and local exploitation during the party switching stage, it suffers from stagnation in local optima with a low convergence accuracy. To overcome such drawbacks, a sequence of novel PO variants were proposed by integrating PO with Quadratic Interpolation, Advance Quadratic Interpolation, Cubic Interpolation, Lagrange Interpolation, Newton Interpolation, and Refraction Learning (RL). The main contributions of this work are listed as follows. (1) The interpolation strategy was adopted to help the current global optima jump out of local optima. (2) Specifically, RL was integrated into PO to improve the diversity of the population. (3) To improve the ability of balancing exploration and exploitation during the party switching stage, a logistic model was proposed to maintain a good balance. To the best of our knowledge, PO combined with the interpolation strategy and RL was proposed here for the first time. The performance of the best PO variant was evaluated by 19 widely used benchmark functions and 30 test functions from the IEEE CEC 2014. Experimental results revealed the superior performance of the proposed algorithm in terms of exploration capacity.
Assessment of the gut bacterial microbiome and metabolome of girls and women with Rett Syndrome
Authors: Thapa Santosh , Venkatachalam Alamelu , Khan Nabeel , Naqvi Mohammed , Balderas Miriam , Runge Jessica K. , Haag Anthony , Hoch Kathleen M. , Glaze Daniel G. , Luna Ruth Ann , Motil Kathleen J.
Published: May 2021

Background

Gastrointestinal problems affect the health and quality of life of individuals with Rett syndrome (RTT) and pose a medical hardship for their caregivers. We hypothesized that the variability in the RTT phenotype contributes to the dysbiosis of the gut microbiome and metabolome in RTT, predisposing these individuals to gastrointestinal dysfunction.

Objectives

We characterized the gut bacterial microbiome and metabolome in girls and young women with RTT (n = 44) and unaffected controls (n = 21), and examined the relation between the composition of the microbiome and variations in the RTT phenotype.

Methods

Demographics and clinical information, including growth and anthropometric measurements, pubertal status, symptoms, clinical severity score, bowel movement, medication use, and dietary intakes were collected from the participants. Fecal samples were collected for analysis of the gut microbiome using Illumina MiSeq-based next-generation sequencing of the 16S rRNA gene followed by bioinformatics analysis of microbial composition, diversity, and community structure. Selected end-products of microbial protein metabolism were characterized by liquid chromatography-mass spectrometry.

Results

The gut bacterial microbiome differed within the RTT cohort based on pubertal status (p<0.02) and clinical severity scores (p<0.02) of the individuals and the type of diet (p<0.01) consumed. Although the composition of the gut microbiome did not differ between RTT and unaffected individuals, concentrations of protein end-products of the gut bacterial metabolome, including γ-aminobutyric acid (GABA) (p<0.001), tyrosine (p<0.02), and glutamate (p<0.06), were lower in the RTT cohort. Differences in the microbiome within RTT groups, based on symptomatic anxiety, hyperventilation, abdominal distention, or changes in stool frequency and consistency, were not detected.

Conclusions

Although variability in the RTT phenotype contributes to the dysbiosis of the gut microbiome, we presently cannot infer causality between gut bacterial dysbiosis and gastrointestinal dysfunction. Nevertheless, alterations in the gut metabolome may provide clues to the pathophysiology of gastrointestinal problems in RTT.
Readiness of physicians and medical students to cope with the COVID-19 pandemic in the UAE
Authors: Barqawi Hiba J. , Kampani Drishti D. , Haddad Enad S. , Al-Roub Nora M. , Abu-Gharbieh Eman
Published: May 2021

Background

Coronavirus disease (COVID-19), caused by Severe Acute Respiratory Syndrome–Coronavirus 2 (SARS-CoV2), is the defining global health crisis of this time. It is responsible for significant morbidity and has had severe socioeconomic consequences. This study aims to assess the knowledge, preparedness and attitudes of medical students, physicians and faculty members in the United Arab Emirates (UAE) on COVID-19 and their perspective on the roles of educational and healthcare institution towards improving pandemic preparedness and enabling optimal care.

Methodology

An exploratory, descriptive cross-sectional study was conducted with 444 participants, using a non-probability convenience sampling method. English-speaking participants from the medical field aged 18 and above were included in the study. The validated questionnaire was administered online and distributed across social media platforms from May-July 2020. T-test, ANOVA, Kruskal-Wallis test and Mann-Whitney-U test were used when appropriate. Responses were analysed and statistical tests applied using IBM SPSS, version 25.

Results

The knowledge scores were calculated amongst different ages and professional status, and the mean was 59.08% (SD = 12.848%). Almost half of the participants obtained poor knowledge scores (less than 60%). Most of the participants followed the latest updates on COVID-19 (86.7%). The majority opted to obtain information from the national health authorities (63.4%). The mean preparedness score among the participants was 68.65% (SD = 17.456%). Being in contact with patients significantly increased the preparedness score (p< 0.001). Only 27.9% of the participants believed their college education provided adequate knowledge to deal with epidemics or pandemics. Several barriers affect willingness to work in a pandemic, with 80.6% of participants worried about posing a risk to family members.

Conclusion

This study highlights the importance of establishing tailored COVID-19 related education programs to improve knowledge levels, especially in medical students. Efforts are still needed to promote effective control measures and address the barriers affecting willingness to work in a pandemic.
Accuracy analysis of dam deformation monitoring and correction of refraction with robotic total station
Authors: Zhou Jianguo , Shi Bo , Liu Guanlan , Ju Shujun
Published: May 2021

Robotic total stations have been widely used in continuous automatic monitoring of dam deformations. In this regard, monitoring accuracy is an important factor affecting deformation analysis. First the displacements calculation methods for dam deformation monitoring with total stations are presented, and the corresponding mean square error formulas are derived. Then for errors caused by atmospheric refraction, two correction methods are described. Simulations were conducted to compare the displacement accuracy calculated through different methods. It indicated that the difference between polar coordinate method and forward intersection is less than 0.5mm within around 400m’ monitoring range, and in such cases, the polar coordinate method is preferred, as only one total station is required. Refraction correction tests with observations from two dams demonstrated that both correction methods could effectively enhance the monitoring accuracy. For observation correction, correction through the closest reference point achieves better correction results.
Vexy Thing: On Gender and Liberation, Imani Perry (2018)
Authors: Crunden Rebecca
Published: May 2021

Review of: Vexy Thing: On Gender and Liberation, Imani Perry (2018)

Durham, NC: Duke University Press, 294 pp.,

ISBN 978-1-47800-081-5, p/bk, $27.95
História da Ciência no Ensino. Revisitando Abordagens, Inovando Saberes
Authors: Santos Ana Luísa , Rola Ana Isabel Simões , Morais Carla , Vasconcelos Clara , Gomes Elsa M. C. , Rodrigues Isilda Teixeira , Azevedo Jorge , Rodrigues Sérgio P. J.
Published: May 2021

A história da ciência é referida por diversos autores como fundamental para o entendimento da forma como a ciência se desenvolve útil nos processos de aprendizagem e muito relevante para a promoção da humanização da ciência através das biografias. Partindo destas premissas, temas como biografias de cientistas, objectos históricos, espólios de museus, obras e teorias históricas, programas escolares e de divulgação, dialogam, nesta obra, com o ensino formal e informal, assim como o ensino não formal, através de objectos históricos, espólios de museus, obras históricas e novas abordagens educacionais.
Attardo, Salvatore (2020). The Linguistics of Humor: An Introduction, Oxford: Oxford University Press. ISBN: 9780198791287. 496 Páginas
Authors: Silvestre Miralles Alicia
Published: May 2021

Reseña de: Attardo, Salvatore (2020). The Linguistics of Humor: An Introduction, Oxford: Oxford University Press. ISBN: 978-0198791287. 496 páginas.
Fernández Jaén, J. y H. Provencio Garrigós (eds.) (2020). Changes in meaning and function. Studies in historical linguistics with a focus on Spanish. Amsterdam / Filadelfia: John Benjamins Publishing Company. 332 Páginas
Authors: Torres Soler Julio
Published: May 2021

Reseña de: Fernández Jaén, J. y H. Provencio Garrigós (eds.) (2020). Changes in meaning and function. Studies in historical linguistics with a focus on Spanish. Amsterdam / Filadelfia: John Benjamins Publishing Company. 332 Páginas. ISBN 9789027205360.
Palabras monocolocables en español y en italiano: ¿cómo identificar palabras con una colocabilidad muy restringida?
Authors: Cermak Petr , Obstová Zora
Published: May 2021

El artículo estudia el fenómeno de la colocabilidad extremadamente restringida en español y en italiano, fenómeno poco estudiado hasta ahora. Su objetivo principal es poner a prueba un método automatizado capaz de identificar las llamadas palabras monocolocables (entendidas como palabras cuyo potencial para formar parte de colocaciones es enormemente limitado) en los corpus lingüísticos. Además, ofrece un listado de palabras de este tipo en español e italiano, así como una tipología de las combinaciones fijas en las cuales aparecen (diferentes tipos de locuciones, términos) y un comentario de sus propiedades básicas. Todo ello permite comparar el fenómeno de la colocabilidad restringida en los dos idiomas.
Forecasting Turkey's Hazelnut Export Quantities with Facebook's Prophet Algorithm and Box-Cox Transformation
Authors: Aytaç Ersin
Published: May 2021

Time series forecasting methods are used by an evolving field of data analytics for the prediction of market trends, sales, and demands. Turkey is the major producer of hazelnut in the world. If Turkey wants to continue its domination of hazelnut and protect the price-setting role, time series forecasting methods could be key factors accordingly. There are a few studies that focused on time series forecasting of hazelnut export quantities of Turkey, and this study uses a recently developed algorithm and implements a power transformation to increase the forecast accuracy. The presented research aims to forecast Turkey’s hazelnut export quantities for the coming 36-months starting from June 2020. The forecasting process was conducted with the help of Facebook’s Prophet algorithm. To improve the forecast accuracy, a Box-Cox power transformation was also implemented to process. To find out the stationarity and periodicity of the data set, the Augmented Dickey-Fuller test and autocorrelation function was applied to the time-series data. The Prophet algorithm, with Box-Cox transformation, projected the hazelnut export quantity could be over five hundred thousand tons from 07/2020 to 06/2023. The export quantities were in an increment trend, and the slope of the trend has increased since June 2008 by 0.66 % per month. The Prophet algorithm also revealed the seasonality of the data set, and the export amounts indicate monthly oscillations. The monthly export volumes start to increase and reach their peak value in October because August is the time for the harvest of hazelnuts in Turkey.
El médico (2013): Medicina en la Edad Media
Authors: Pintor Holguín Emilio , Martínez Alsina Nieves , Gutiérrez Cisneros Maria Josefa , Herreros Ruiz-Valdepeñas Benjamín
Published: May 2021

En la Inglaterra del siglo XI, un huérfano de 8 años llegará a ser el aprendiz de un cirujano-barbero. Aprende las habilidades básicas de este oficio (sacar dientes, hacer sangrías y pequeñas cirugías) pero no es suficiente. Así que decidirá llegar a ser un médico. Para ello, viajará a Oriente Medio donde se encuentra la más famosa escuela de Medicina. En Persia, logrará entrar como alumno en la madrasa de Ibn Sina (Avicena) donde recibirá una formación teórica y práctica de la medicina, así como de otras disciplinas para lograr ser un médico.
The impact of reduced graphene oxide on the properties of polyamide 6
Authors: Sabet Maziyar , Hosseini Seyednooroldin
Published: May 2021

Polyamide 6 (PA6) nanocomposites with electric and thermal conductive properties were formulated via melt processing of PA6 and diff erent inclusion of reduced graphene oxide (RGO). These nanocomposites showed that the small percolation threshold and the perfect formation of conductive link form with 0.5 wt % and ~3.0 wt % of RGO, respectively. Examination of crystallization confi rmed that RGO enabled the crystallization of PA6 structure mostly through speeding up the formation ofcrystal nucleus, reaching the biggest and the smallest of crystal grain extent with RGO inclusion up to 2.0 wt % what enabled the generation of the most unfl awed crystalline matrix. Dynamic rheological testing results indicated the frequency-independence of G’ and abruptly decrease phase angle at the small-frequency area via RGO content of 2.0 wt % specifi es the alteration state from liquid-state to solidstate rheological performance, and validates the development of percolation link structure with RGO in the function of a crosslinking factor. The progress of fi re-retardant characteristics of PA6 was att ained due to the inclusion of RGO in the PA6 structure. Morphological research showed that RGO was spread consistently in the PA6 structure. The outcomes of cone calorimetry showed that the fl ame-retardantcharacteristics of PA6 were promoted with the addition of RGO in the PA6 structure. These tests show substantial capacity for the bulk manufacture of electric conductive polymer/RGO nanocomposites.
Thermal and mechanical properties of poly(L-lactic acid) nucleated with N,N’-bis(phenyl) 1,4-naphthalenedicarboxylic acid dihydrazide
Authors: Zhao Li-Sha , Qiao Jun , Chen Wei , Cai Yan-hua
Published: May 2021

The modified poly(L-lactic acid) (PLLA) with different contents (0.5−3 wt %) of N,N’-bis(phenyl) 1,4-naphthalenedicarboxylic acid dihydrazide (NAPH) were prepared to evaluate effects of NAPH on melt-crystallization behavior (DSC), thermal degradation (TGA) and mechanical properties of PLLA. The melt-crystallization results demonstrated that NAPH as a heterogeneous organic nucleating agent enhanced crystallization ability of PLLA in cooling, and PLLA/1%NAPH had the best crystallization ability because of the highest onset crystallization temperature and the sharpest melt-crystallization peak. However, melt-crystallization behavior also depended on the cooling rate and final melting temperature, overall, a relative slow cooling rate and low final melting temperature were beneficial for crystallization of PLLA. The cold-crystallization results indicated that NAPH had an inhibition for cold-crystallization process of PLLA, and the cold-crystallization peak shifted towards lower temperature and became wider with an increase of NAPH concentration. The different melting behaviors ofPLLA/NAPH after melt-crystallization and isothermal-crystallization efficiently reflected the accelerating role of NAPH for PLLA crystallization; the double melting peaks formed in heating were thought to result from melting-recrystallization, as well as that a higher crystallization temperature could cause melting peak to appear in higher temperature regions and possess larger melting enthalpy. A comparative analysis on thermal degradation in air illustrated that the addition of NAPH accelerated decomposition of PLLA, but a decrease of onset decomposition temperature was inhibited by the probable interaction of PLLA with NAPH. Moreover, the tensile test showed that NAPH decreased tensile modulus and elongation at break of PLLA, whereas PLLA with low concentration of NAPH had higher tensile strength than pure PLLA.
Analisis Kesalahan dalam Menyelesaikan Soal Geometri Siswa Kelas XI SMK Bina Warga Lemahabang
Authors: Misni Misni , Ferdianto Ferry
Published: May 2021

Geometri mengandung gambar dan simbol-simbol yang abstrak sehingga butuh penalaran yang tinggi. Kebanyakan siswa kurang memahami materi geometri, sehingga ketika siswa dihadapkan dengan soal geometri akan terjadi kesalahan dalam pengerjaannya.  Oleh karena itu,  perlu adanya identifikasi dari kesalahan-kesalahan siswa dalam menjawab soal-soal geometri. Adapun, tujuan dari penelitian ini adalah untuk mengetahui jenis-jenis kesalahan siswa dalam menyelesaikan soal geometri dan untuk mengetahui faktor-faktor yang menjadi kesalahan siswa dalam menjawab soal geomerti. Penelitian ini menggunakan metode deskriptif kualitatif. Sampel yang digunakan dalam penelitian ini adalah siswa kelas XI AK SMK Bina Warga Lemahabang. Pengambilan sampelnya yaitu dengan teknik purposive sampling berdasarkan hasil tes siswa. Cara dalam menganalisis hasil tes siswa dilakukan dengan mengidentifikasi data yang diperoleh dari hasil tes siswa lalu disimpulkan jenis-jenis kesalahannya. Adapun hasil analisis soal dan jawaban siswa, diketahui bahwa faktor-faktor yang menyebabkan kesalahan adalah (1) kesalahan dalam memahami konsep (2) kurangnya tingkat penalaran siswa untuk mencapai sebuah ruang. (3) kurang teliti (4) kurang menguasai materi (5) kesalahan dalam menuliskan formula.

[Geometry contains abstract images and symbols so it needs high reasoning. Most students do not understand geometry material, so that when students are faced with geometric problems there will be errors in the process. Therefore, it is necessary to identify students' mistakes in answering geometry questions. Meanwhile, the purpose of this study is to determine the types of student errors in solving geometry problems and to find out the factors that are the students' mistakes in answering geomechanical questions. This study used descriptive qualitative method. The sample used in this study was class XI AK SMK Bina Warga Lemahabang. Sampling is by purposive sampling technique based on student test results. The way to analyze student test results is done by identifying data obtained from student test results and then concluding the types of errors. The results of the analysis of the questions and answers of students, it is known that the factors that cause errors are (1) errors in understanding the concept (2) the lack of students' level of reasoning to reach a space. (3) inaccurate (4) lack of mastery of material (5) errors in writing formula.]
Hidrogeologi Desa Perapat Tunggal dan Sekitarnya, Pulau Bengkalis, Kabupaten Bengkalis, Provinsi Riau
Authors: Bastira Shahnaz Noveta , Muljana Budi , Hadian Mohamad Sapari Dwi , Putra Dewandra Bagus Eka
Published: May 2021

Pulau Bengkalis merupakan daerah yang memiliki kondisi air tanah yang tidak layak dipakai dalam kehidupan sehari – hari. Tersusun oleh litologi lempung, pasir dan sebagian rawa gambut yang mempengaruhi kondisi air tanah. Tujuan penelitian ini mengetahui potensi airtanah berdasarkan pengamatan pada sumur gali. Hasil penelitian menunjukkan kadar Ph berkisar antara 7,13 sampai 5,37. Hasil pemetaan muka air tanah menunjukkan arah aliran airtanah pada barat daya sesuai dengan topografi pada daerah penelitian. Rata – rata curah hujan pada daerah penelitian sebesar 1873 mm/tahun dan evaporasi sebesar 2437,1 mm/tahun serta defisit air sebesar 575,22 mm/tahun. Perhitungan neraca air menghasilkan debit presipitasi efektif sebesar 968,27 m3/tahun, debit infiltrasi sebesar 387,31 m3/tahun, dan debit run-off sebesar 580,96 m3/tahun. Pengukuran geolistrik 2D sebanyak empat titik menggambarkan tiga bagian nilai resistivitas bawah permukaan yang menunjukkan kondisi geologi. Batuan terdiri dari lempung, lanau, lempung pasiran dan pasir kasar. Bagian pertama 0 – 56,3 Ωm pada kedalaman 0 – 15 meter merupakan lanau – lempung, bagian kedua 56,4 – 162 Ωm pada kedalaman 32 meter merupakan lempung pasiran serta bagian ketiga 163 – 500 Ωm pada kedalaman 48 meter merupakan pasir kasar yang diperkirakan menjadi potensi akuifer pada kedalaman 20 meter sampai dengan 50 meter.
Pemanfaatan Survey GPS Geodetik untuk Pengamatan Deformasi Inter-seismik Setelah Satu Dekade Kejadian Gempa Bumi Bengkulu 2007 (Mw 8.4) di Daerah Bengkulu Bagian Utara
Authors: Lubis Ashar Muda
Published: May 2021

Penelitian siklus gempa bumi sangat penting yang meliputi fase co-seismik, post-seismik dan inter-seismik untuk dilakukan. Penelitian ini bertujuan untuk mengamati deformasi inter-seismik di daerah Bengkulu bagian utara setelah satu dekade kejadian deformasi post-seismik gempa bumi Bengkulu 2007 (Mw 8,4) dengan menggunakan pemantauan Global Positioning System (GPS). Pengambilan data GPS dilakukan pada 5 titik pengamatan yaitu titik BNTL, IPUH, SBLT, MURI dan KTHN selama tahun 2018-2020. Data GPS tersebut diolah menggunakan perangkat GAMIT/GLOBK. Hasil penelitian memperlihatkan bahwa setelah lebih 10 tahun kejadian gempa bumi tahun 2007 (Mw 8,4), daerah Bengkulu bagian utara saat sekarang mengalami fase inter-seismik dalam siklus gempa bumi yang ditandai dengan deformasi inter-seismik pada 5 stasiun GPS. Vector pergerakan pada ini kelihatan seragam dengan kecepatan rata-rata 20 mm/tahun menuju arah timur laut, sesuai dengan pergerakan relatif plate tektonik Indo-Australia terhadap Eurasia. Hasil penelitian lain menunjukkan bahwa tidak terlihat deformasi co-seismik akibat dari 285 gempa bumi dengan kekuatan 4.0 dari bulan Januari 2018 sampai November 2020 di daerah Bengkulu bagian utara. Untuk keperluan mitigasi dan perencanaan wilayah, maka perlu dilakukan penelitian yang kontinu serta menambah titik pengamatan GPS dalam rangka pemetaan kawasan pengumpulan stress maupun pengeluaran energy melalui gempa bumi di Bengkulu.
KAJIAN PERILAKU WISATAWAN DAN PKL DI LAPANGAN MERDEKA BENGKULU PADA FASE NORMAL BARU
Authors: Hakim Abdul Hamid
Published: May 2021

Himbauan Pemerintah  untuk melakukan aktifitas dengan menerapkan protokol kesehatan wajib dipatuhi oleh masyarakat untuk menghindari penyebaran wabah yang sangat cepat. Bengkulu sebagai salah satu provinsi di Indonesia menerapakan hal serupa, tetapi kenyataan yang terjadi di lapangan banyak masyarakat yang tidak mengindahkan himbau ini dengan tetap melakukan aktifitas seperti biasa, seperti berkumpul ditempat wisata salah satunya yaitu Koridor Lapangan Merdeka Bengkulu yang menjadi lokasi penelitian pada ini. Penelitian ini bertujuan untuk menganalisa perilaku masyarakat di Koridor Lapangan Merdeka Bengkulu sebagai ruang publik dalam mengahadapi masa normal baru. Metode pendekatan dalam penelitian ini adalah deskriptif evaluatif yang bertujuan untuk mengumpulkan informasi tentang apa yang terjadi, yang merupakan kondisi nyata mengenai keterlaksanaan rencana yang memerlukan evaluasi. Hasil menunjukan bahwa kawasan koridor Lapangan Merdeka Bengkulu sebagai salah satu magnet wisata di Kota Bengkulu, belum siap menjalankan protokol kesehatan selama masa pandemi dan kurangnya fasilitas yang dapat digunakan untuk pencegahan penyebaran infeksi virus corona khususnya di Kota Bengkulu.
Analysis of contributing factors influencing thromboembolic events after total knee arthroplasty
Authors: Plante Sylvie , Belzile Etienne L. , Fréchette Dominique , Lefebvre Jean
Published: May 2021

Background: Venous thromboembolic events (VTE) are a known and well-described complication following total knee arthroplasty (TKA). We sought to validate the American College of Chest Physicians thromboprophylaxis recommendations after elective TKA, paying special attention to our dose adjustments for weight, and their impact on VTE in our population. Methods: We retrospectively investigated risk factors in patients undergoing TKA, focusing mainly on symptomatic VTE occurrence rates from deep vein thrombosis (DVT) or pulmonary embolism (PE). The anticoagulation protocol consisted of starting low molecular weight heparin (LMWH) therapy, with dalteparin administered 12 h after surgery in patients who received general anesthesia or 24 h later in patients who received single-dose regional anesthesia. Results: Data from 346 patients (mean age 66.8 [range 24–91] yr) who underwent primary or revision TKA depicted an overall symptomatic VTE rate of 15%. The proximal DVT rate was 1.7%, and the nonfatal PE rate was 0.9%. The mean time to VTE diagnosis was 5.6 days. The first dalteparin dose was administered 19.5 (range 10–48) h after surgery in patients without VTE and 22.6 (range 11.5–52) h after surgery in patients with VTE (p = 0.003). With a first dose of dalteparin administered 12 h postoperatively, patients presented significantly lower DVT and PE rates than if it was administered 24 h postoperatively (8.5% v. 16.3%, p = 0.048). Conclusion: Delayed administration of LMWH has deleteriously impacted the VTE rate after TKA at our institution. Prompt initiation of LMWH (≤ 12 h after surgery) is appropriate, without increasing the risk of major bleeding.
K-fold Validation Neural Network Approach for Predicting the One-Day Compressive Strength of UHPC
Authors: Abellán-García Joaquín
Published: May 2021

This paper analyzes the application of artificial neural networks (ANN) to predict the 1-day compressive strength of ultra-high-performance concrete (UHPC) made with any combination of powders and supplementary cementitious materials (SCM) such as silica fume (SF), fly ash (FA), ground granulated blast slag furnace (GGBSF), recycled glass powder (GP), rice husk ash (RHA), fluid catalytic cracking catalyst residue (FC3R), metakaolin (MK), limestone powder (LP), and quartz powder (QP). A total of 604 data from scientific literature were used to train the one hidden layer ANN model by using the k-fold validation procedure. Furthermore, 90 UHPC mixtures were experimentally performed to validate the proposed ANN model. The performance of the model was assessed using several statistical performance indexes: ratio of the root mean square error to the standard deviation of measured data (RSR), root mean square error (RSME), normalized mean bias error (NMBE), Nash–Sutcliff efficiency, and coefficient of multiple determination (R2). Connection weight approach (CWA) algorithm was utilized to analyze the relationships between the UHPC components and the 1-day compressive strength. The results indicated that the ANN is an efficient model for predicting the early strength (1-day compressive strength) of UHPC achieving R2 values of 0.88 and 0.86 on the test data and experimental data, respectively, even when the experimental dosages included combinations of components that were not found in the training data. The results of the CWA analysis indicated that SCM such as MK, FC3R, SF, and LP, as well as other factors such as virtual packing density, improved the early strength of UHPC, whereas FA, GP, and RHA were pointed out as harmful for the one-day compressive strength. As conclusion, the ANN model could be helpful in the developing of UHPC with early strength needs by preselecting the combinations of available SCM and powders that have better results in the model at lower cost.
Investigation of an Ice Hockey Helmet Test Protocol Representing Three Concussion Event Types
Authors: Meehan Andrew , Post Andrew , Blaine Hoshizaki T. , Gilchrist Michael D.
Published: May 2021

Although ice hockey helmet standards mitigate the risk of catastrophic head injuries, the risk of concussion remains high. To improve protection, helmets need to be evaluated using impact conditions reflecting how concussions occur in ice hockey. The purpose of this research was to evaluate how three helmet impact tests represent three common concussive events in ice hockey. An ice drop test (representing head-to-ice impacts), 30° and 45° anvil boards drop tests (representing head-to-boards impacts), and medium and high shoulder compliance pneumatic ram tests (representing shoulder-to-head impacts) were performed on a hybrid III headform. Finite element analysis using the University College Dublin Brain Trauma Model was conducted to calculate maximum principal strain (MPS). The mean dynamic response and MPS from each helmet test were compared to a dataset of concussive injury reconstructions. Stepwise forward multiple linear regressions identified the dynamic response variables producing the strongest relationship with MPS for each helmet test and concussion reconstructions. The results indicated that the ice and boards drop test and shoulder ram test had magnitudes and relationships between variables similar to the concussion reconstructions. The proposed testing methodologies in this study closely approximated concussion mechanics in ice hockey and inform improved helmet test standards and design.
Experimental and Numerical Investigation of Single Fiber Pull-Out Tests of Steel Macro-Fiber and Glass Micro-Fiber in a Cementitious Matrix
Authors: Khabaz Amjad
Published: May 2021

This paper presents a modeling-based relationship between fiber diameter and frictional bond strength for steel macro-fiber (0.8-mm diameter) and glass micro-fiber (5–24-μm diameter) embedded in a cementitious matrix. A combined approach of experimental stress-displacement results obtained through single fiber pull-out tests and finite element modeling (FEM)–based stress-displacement results yielded the friction coefficient for the two types of fibers used. Further analysis relating to the pressure exerted on the fiber caused by the surrounding concrete reveals that a smaller fiber diameter would improve the bond strength. The improvements in frictional bond strength due to reduced diameter are based on FEM analysis. Validation of the experimental results is done through numerical approaches. The results showed that in the case of the same diameter, the pressure of the surrounding concrete decreases throughout the fiber sliding. The results also showed that the smaller diameter of fiber improves the properties of fiber-reinforced concrete interfaces.
E-dnevnik u školskoj praksi – mišljenja i iskustva nastavnika srednjih škola
Authors: Vrkić Dimić Jasmina , Vidov Sara
Published: May 2021

Članak prikazuje rezultate anketnoga ispitivanja mišljenja i iskustava nastavnika srednjih škola o implementaciji e-dnevnika u školsku praksu, prednostima i nedostatcima njegova korištenja te mogućnostima njegova daljnjega unaprjeđenja. U istraživanju je sudjelovalo 127 ispitanika – nastavnika 9 srednjih škola u gradu Zadru koji u svojem svakodnevnom radu koriste e-dnevnik. Rezultati istraživanja pokazuju da je uporaba e-dnevnika zaživjela u odgojno-obrazovnoj praksi naših škola. Nastavnici ga pretežito pozitivno doživljavaju, smatraju ga jednostavnim za uporabu i korisnim za poboljšanje obrazovnoga sustava. Većina ih je pohađala obuke za korištenje e-dnevnika, poglavito one organizirane u školama te njihovu kvalitetu visoko pozitivno vrednuju. Nastavnici ne koriste sve potencijale e-dnevnika, već njegovim mogućnostima i opcijama pristupaju selektivno koristeći tek dio njegovih ukupnih potencijala. Na temelju iskustva korištenja e-dnevnika u školskoj praksi nastavnici navode njegove najveće prednosti i nedostatke te u skladu s njima  daju sugestije za njegovo daljnje unaprjeđenje. S obzirom na to da ne postoje slična istraživanja, ovdje prikazani rezultati ispitivanja mišljenja i iskustava nastavnika srednjih škola mogli bi poslužiti kao putokaz daljnje aktualizacije i unaprjeđenja aplikacije e-dnevnik.
Rašinovac near Ždrapanj (northern Dalmatia) – An early neolithic site
Authors: Podrug Emil , B. Mcclure Sarah , Perhoč Zlatko , Kačar Sonja , Reed Kelly , Zavodny Emily
Published: May 2021

This paper presents the results from an archaeological excavation at the Neolithic site of Rašinovac, near Ždrapanj in the Piramatovci Valley (in the hinterland of the town of Skradin in Northern Dalmatia). This previously unknown site was test excavated in 2013 when a 2x2-metre trench was opened to determine the site’s stratigraphy and chronology. Excavations suggested that Rašinovac was a single-layer open-air settlement and subsequent analyses of the material culture (mostly pottery and chert) confirmed that it was an Impressed Ware site. Two radiocarbon dates also reveal that Rašinovac is among the earliest known Early Neolithic sites in the region (first century of the 6th millennium BC).
Babićev Trogir
Authors: Sorić Sofija
Published: May 2021

Monografija Trogir: grad i spomenici Ive Babića kruna je njegova dugogodišnjeg istraživačkog i konzervatorskog rada na trogirskim spomenicima. U jednom opsežnom volumenu iznio je kompetentnu i cjelovitu sintezu dosadašnjih spoznaja o trogirskim spomenicima i urbanizmu te vlastitu interpretaciju grada u prostoru i vremenu. Kroz tri sistematično razdijeljena poglavlja obuhvaćene su sve važne umjetnine Trogira, od slikarstva, skulpture i zlatarskih djela, koje se čuvaju u nizu muzeja i riznica grada, do djela sakralne i profane arhitekture te urbanizma. Poseban doprinos autora jest znalački napisana urbanističko-kulturno-povijesna studija vremenskog i prostornog okvira Trogira i okolice iznesena u uvodnom poglavlju. Trogir: grad i spomenici bit će trajan i vrijedan priručnik svim istraživačima trogirske baštine, a zasigurno će pronaći svoj krug čitatelja i među najširom publikom, ljubiteljima trogirske baštine.
In memoriam Željko Rapanić
Authors: Jakšić Nikola
Published: May 2021

Sijećanje.
Značaj i simbolika psa na sepulkralnim spomenicima Salone
Authors: Bekavac Silvia , Klarić Ivan
Published: May 2021

U radu su obrađeni salonitanski sepulkralni spomenici s motivom psa. Dva su osnovna cilja: prvi je proučiti odnos čovjeka i psa kontekstualizirajući ikonografske motive kroz različite aspekte kao što su lov, kult te individualistički pristup pojedinca prema psu kao kućnom ljubimcu; drugi cilj je, analizirajući spomenike, rekonstruirati predodžbu o položaju i slojevitom značenju psa u rimskom društvu, otkrivajući i simboliku određenih likovnih predložaka zastupljenih na salonitanskim sepulkralnim spomenicima.
Dvije slike iz Zbirke starih majstora Pomorskog i povijesnog muzeja Hrvatskog primorja Rijeka nastale prema djelima Bernarda Strozzija
Authors: Bolić Marin
Published: May 2021

U ovom se članku upućuje na dva rada iz Zbirke starih majstora u Pomorskom i Povijesnom muzeju Hrvatskog primorja Rijeka što se mogu povezati s imenom Bernarda Strozzija (Genova, 1582. – Venecija, 1644.). Glava bradatog starca ističe se svojom kvalitetom i gotovo je istovjetna radu pripisanom Strozziju, odnosno njegovu imitatoru, što je tijekom posljednjih 15 godina bio ponuđen na dražbama uglednih aukcijskih kuća Christie’s i Sotheby’s. Djelo prodano u New Yorku 2010. godine najvjerojatnije je služilo kao radionički predložak, a to potvrđuje i riječka slika na kojoj se, za razliku od izvornika, u donjem dijelu kompozicije vide starčev plašt i lijeva šaka. Bez obzira na to je li aukcijska verzija u jednom trenutku bila rezana ili je riječka slika, zapravo, patchwork više Strozzijevih studija, kvaliteta potonje, njezina specifična faktura i odlučan potez upućuju na to da je riječ o kvalitetnu djelu majstorove radionice. Platno Sveti Jakov Stariji je pak kopija Strozzijeva originala što se nalazio u milanskoj privatnoj zbirci, a nedavno je ponuđen na dražbi aukcijske kuće Christie’s u New Yorku. Autor riječke slike je najvjerojatnije lombardski kopist iz 17. stoljeća. Iako je provenijencija Strozzijeva Svetog Jakova Starijeg nepoznata, činjenica da njegova riječka, likovno relativno skromna kopija iskazuje odlike lombardskog slikarstva sredine ili druge polovice 17. stoljeća, upućuje na to da se ova slika ubrzo nakon nastanka vjerojatno nalazila u privatnom vlasništvu na području Lombardije i stoga ostala potpuno nepoznata poznavateljskoj ili široj javnosti.