bluuebunny/crossref_metadata_2025 huggingface dataset:
The MUSE Hubble Ultra Deep Field Survey
Authors: Feltre Anna , Maseda Michael V. , Bacon Roland , Pradeep Jayadev , Leclercq Floriane , Kusakabe Haruka , Wisotzki Lutz , Hashimoto Takuya , Schmidt Kasper B. , Blaizot Jeremy , Brinchmann Jarle , Boogaard Leindert , Cantalupo Sebastiano , Carton David , Inami Hanae , Kollatschny Wolfram , Marino Raffaella A. , Matthee Jorryt , Nanayakkara Themiya , Richard Johan , Schaye Joop , Tresse Laurence , Urrutia Tanya , Verhamme Anne , Weilbacher Peter M.
Published: July 2020

We investigated the ultraviolet (UV) spectral properties of faint Lyman-α emitters (LAEs) in the redshift range 2.9 ≤ z ≤ 4.6, and we provide material to prepare future observations of the faint Universe. We used data from the MUSE Hubble Ultra Deep Survey to construct mean rest-frame spectra of continuum-faint (median MUV of −18 and down to MUV of −16), low stellar mass (median value of 108.4 M⊙ and down to 107 M⊙) LAEs at redshift z ≳ 3. We computed various averaged spectra of LAEs, subsampled on the basis of their observational (e.g., Lyα strength, UV magnitude and spectral slope) and physical (e.g., stellar mass and star-formation rate) properties. We searched for UV spectral features other than Lyα, such as higher ionization nebular emission lines and absorption features. We successfully observed the O III]λ1666 and [C III]λ1907+C III]λ1909 collisionally excited emission lines and the He IIλ1640 recombination feature, as well as the resonant C IVλλ1548,1551 doublet either in emission or P-Cygni. We compared the observed spectral properties of the different mean spectra and find the emission lines to vary with the observational and physical properties of the LAEs. In particular, the mean spectra of LAEs with larger Lyα equivalent widths, fainter UV magnitudes, bluer UV spectral slopes, and lower stellar masses show the strongest nebular emission. The line ratios of these lines are similar to those measured in the spectra of local metal-poor galaxies, while their equivalent widths are weaker compared to the handful of extreme values detected in individual spectra of z >  2 galaxies. This suggests that weak UV features are likely ubiquitous in high z, low-mass, and faint LAEs. We publicly released the stacked spectra, as they can serve as empirical templates for the design of future observations, such as those with the James Webb Space Telescope and the Extremely Large Telescope.
Role of rift-inheritance and segmentation for orogenic evolution: example from the Pyrenean-Cantabrian system
Authors: Lescoutre Rodolphe , Manatschal Gianreto
Published: July 2020

The Basque-Cantabrian junction corresponds to an inverted rift accommodation zone at the limit between the former hyperextended Pyrenean and Cantabrian rift segments. The recognition of an inherited rift segment boundary allows to investigate the reactivation associated with large-scale rift segmentation in an orogenic system. We use criteria from published field observations and seismic data to propose a new map of rift domains for the Basque-Cantabrian junction. We also provide balanced cross-sections that allow to define the along-strike architecture associated with segmentation during rifting and subsequent Alpine reactivation. Based on these results, this study aims to characterize and identify reactivated and newly formed structures during inversion of two rift segments and its intermitted segment boundary. It also aims to describe the timing of thin-skinned and thick-skinned deformation associated with the inversion of segmented rift systems. During convergence, two phases have been recognized within the rift segment (eastern Mauléon basin). The Late Cretaceous to Paleocene underthrusting/subduction phase was mostly governed by thin-skinned deformation that reactivated the former hyperextended domains and the supra-salt sedimentary cover. The Eocene to Miocene collisional phase, controlled by thick-skinned deformation that took place once necking domains collided and formed an orogenic wedge. At the rift segment boundary, the underthrusting/subduction phase was already controlled by thick-skinned deformation due to the formation of shortcutting thrust faults at the termination of overlapping V-shaped rift segments. This led to the formation of a proto-wedge composed of the Basque massifs. We suggest that this proto-wedge is responsible for the preservation of pre-Alpine structures in the Basque massifs and for the emplacement of subcontinental mantle rocks at a crustal level beneath the western Mauléon basin. These results argue for a first order cylindrical orogenic architecture from the Central Pyrenean segment to the Cantabrian segment (up to the Santander transfer zone) despite rift segmentation. They also highlight the control of 3D rift-inheritance for the initial phase of orogenic evolution and for the local architecture of mountain belts.
Oscillating PDE in a rough domain with a curved interface: Homogenization of an Optimal Control Problem
Authors: Nandakumaran A. K. , Sufian Abu
Published: July 2020

Homogenization of an elliptic PDE with periodic oscillating coefficients and associated optimal control problems with energy type cost functional is considered. The domain is a 3-dimensional region (method applies to anyndimensional region) with oscillating boundary, where the base of the oscillation is curved and it is given by a Lipschitz function. Further, we consider general elliptic PDE with oscillating coefficients. We also include very general type functional of Dirichlet type given with oscillating coefficients which can be different from the coefficient matrix of the equation. We introduce appropriate unfolding operators and approximate unfolded domain to study the limiting analysis. The present article is new in this generality.
Diagnostic Accuracy of Point-of-Care Ultrasound Integrated into Clinical Examination for Acute Diverticulitis: A Prospective Multicenter Study
Authors: Nazerian Peiman , Gigli Chiara , Donnarumma Emilia , de Curtis Ersilia , Bribani Andrea , Lanzi Sabina , Rovida Serena , Magazzini Simone , Grifoni Stefano , Perani Cristiano
Published: July 2020

Purpose Diverticulitis is a common cause of abdominal pain and CT scan is commonly used for its diagnosis in the emergency department (ED). The diagnostic performance of point-of-care ultrasound (POCUS) integrated into a clinical exam for diverticulitis is still not established. We evaluate the accuracy of clinical-sonographic assessment for the diagnosis of diverticulitis and whether POCUS could improve the selection of patients needing CT scan for complicated diverticulitis.

Materials and Methods This is a multicentric observational study involving adult patients suspected of having diverticulitis presenting at 4 EDs. 21 sonographer physicians were asked to diagnose diverticulitis and complicated diverticulitis based on clinical-sonographic assessment. The final diagnosis was established by two reviewers, blinded to POCUS, based on data collected during the one-month follow-up comprehensive CT scan.

Results Among 393 enrolled patients, 218 (55.5 %) were diagnosed with diverticulitis and 33 (8 %) had complicated diverticulitis. The time to diagnosis by the sonographer physicians was shorter compared to standard care (97 ± 102 vs. 330 ± 319 minutes, p < 0.001). Clinical-sonographic assessment showed optimal sensitivity (92.7 %) and specificity (90.9 %) for diverticulitis. However, the sensitivity (50 %) for complicated diverticulitis was low. The sonographer physician would have proceeded to CT scan in 194 (49.4 %) patients and the CT scan request compared to the final diagnosis of complicated diverticulitis demonstrated 94 % sensitivity.

Conclusion Clinical-sonographic assessment is rapid and accurate for the diagnosis of diverticulitis. Even if POCUS has low sensitivity for complicated diverticulitis, it can be used to safely select patients needing CT.
Anpassungsstörung, Depression, Stresssymptome, Corona
bezogene Sorgen und Bewältigungsstrategien während der Corona
Pandemie (COVID-19) bei Schweizer Klinikpersonal
Authors: Krammer Sandy , Augstburger Roland , Haeck Martina , Maercker Andreas
Published: July 2020

Einleitung Studien aus dem internationalen Raum weisen auf eine
erhöhte psychische Belastung des Klinikpersonals während der
Corona Pandemie (COVID-19) hin. Dies ist die erste Studie, die psychische
Belastung, i. e. Anpassungsstörung, Depression,
Stresssymptome und Corona bezogene Sorgen, sowie
Bewältigungsstrategien in dieser Personengruppe im deutschen
Sprachraum untersuchte.

Material und Methoden Es wurden 100 Personen, die derzeit in einer
Klinik beschäftigt sind, im April 2020 befragt. Erhoben wurden
Anpassungsstörung (ADNM-20), Depression (PHQ-9), Stresssymptome und
Bewältigungsstrategien (SCI). Vorliegend wurde der Querschnitt
ausgewertet, die Datenerhebung läuft derzeit noch, es werden
Längsschnittdaten über 15 Monate hinweg entstehen.

Ergebnisse Die Häufigkeit von Anpassungsstörung
beträgt 8% und diejenige von Depression 15%. Ein
Modell zur Vorhersage beider Störungen durch Vorbelastungen und
aktuelle Belastungen fand eine geringfügig verbesserte bessere
Vorhersageleistung für Anpassungsstörung (41%
Varianzaufklärung) als für Depression (35%). Die
Ansteckungssorge für die eigene Person fiel geringer aus als
diejenige für die Familie. Personen aus der Pflege, Personen mit
Vorbelastungen und Frauen sind am meisten belastet. Personen mit direktem
vs. ohne direktem Kontakt mit COVID-19 Patient/innen unterschieden
sich nicht.

Diskussion Das Klinikpersonal ist derzeit psychisch belastet. Das
hinsichtlich Epidemie erfahrene China hat bereits im Januar 2020 erste
Prinzipien für psychiatrische Interventionen herausgegeben. Solche
dürften für die Schweiz ebenfalls sinnvoll sein. Es bedarf
spezifischer psychotherapeutischer Interventionen, insbesondere auf
kognitive Umstrukturierung fokussierend und für den Umgang mit
Alkohol und Zigaretten sensibilisierend, um diese vulnerable und im Rahmen
der Pandemie besonders wichtige Personengruppe zu schützen.
Postpartum NSAID Use and Adverse Outcomes among Women with Hypertensive Disorders of Pregnancy: A Systematic Review and Meta-analysis
Authors: Premkumar Ashish , Ayala Nina K. , Miller Corinne H. , Grobman William A. , Miller Emily S.
Published: July 2020

Objective This study was aimed to perform a systematic review and meta-analysis of the association between postpartum nonsteroidal anti-inflammatory drug (NSAID) use among women with hypertensive disorders of pregnancy (HDP) and risks of adverse postpartum outcomes.

Study Design Studies were eligible if they included women who had been diagnosed with HDP and were postpartum, reported exposure to NSAIDs, were written in English, and were published between January 2000 and November 2019. Assessment of bias was performed using the Newcastle–Ottawa scale for observational studies or the Cochrane Collaborative tool for randomized trials. The primary outcome was maternal blood pressure ≥ 150 mm Hg systolic and/or 100 mm Hg diastolic. Secondary outcomes were persistent blood pressures ≥ 160 mm Hg systolic and/or 110 mm Hg diastolic, mean arterial pressure (MAP), initiation or up-titration of antihypertensive medication, length of hospital stay, rehospitalization for blood pressure control, and postpartum opioid use. A random-effect meta-analysis was performed using RevMan, with a p-value < 0.05 used to indicate statistical significance (PROSPERO CRD no.: 42019127043).

Results Among 7,395 abstracts identified, seven studies (four randomized and three cohort studies, n = 777 patients) met inclusion criteria. All cohort analyses exhibited low levels of bias, while two randomized controlled trials exhibited a high risk of bias in blinding and inclusion criteria. There was no association between NSAID use and blood pressures ≥ 150 mm Hg systolic and/or 100 mm Hg diastolic (risk ratio [RR]: 1.21, 95% confidence interval [CI]: 0.89–1.64). Conversely, NSAID use was associated with a statistically significant, but clinically insignificant, increase in length of postpartum stay (0.21 days, 95% CI: 0.05–0.38). No other secondary outcomes were significantly different between groups.

Conclusion Postpartum NSAID use among women with HDP was not associated with maternal hypertension exacerbation. These findings support the recent American College of Obstetricians and Gynecologists' guideline change, wherein preeclampsia is no longer a contraindication to postpartum NSAID use.

Key Points
Evaluation of the Changes of Salivary pH among Dental Students Depending on Their Anxiety Level
Authors: Said Olga Bait , Razumova Svetlana , Velichko Ellina , Tikhonova Svetlana , Barakat Haydar
Published: July 2020

Objectives The aim of this study was to determine the correlation between the state of anxiety (S-anxiety and T-anxiety based on the state–trait anxiety inventory [STAI] test) and the manifestation of dentophobia with changes in salivary pH.

Materials and Methods The data of 105 patients, aged 18 to 23 were considered. The student’s anxiety levels were evaluated by the STAI test and they were distributed into three groups. To determine dental anxiety, Corah’s dental anxiety scale (CDAS) testing was performed. To determine the changes in salivary pH, samples were obtained, and pH level of the collected whole saliva was evaluated immediately using pHSCAN 5.4–10.0 litmus paper and a scale in 0.1 to 0.4 increments. Statistical significance was set at 0.05.

Results Group I experienced a low level of anxiety and included 33 students (31.4%). Group II comprised of 32 (30.5%) students presenting with a moderate level of anxiety. In group III, 40 students (38.1%) were having a high level of anxiety. Out of the 105 participants, 85% of students showed low level of dentophobia, 27% of them showed a low level of anxiety, 29% showed moderate level of anxiety, and 28% showed high level of anxiety. The average salivary pH value among all the participants (105 students) at rest was 6.79 and in a state of anxiety 6.43.

Conclusion within the limits of this study, a correlation was found between the anxiety level and the salivary pH level. Furthermore, a change in the salivary pH toward acidity was registered in each group of students when in a stressful situation.
Multiple modes of a single spin torque oscillator under the non-linear region
Authors: Sugimoto Satoshi , Iwakiri Shuichi , Kozuka Yusuke , Takahashi Yukiko , Niimi Yasuhiro , Kobayashi Kensuke , Kasai Shinya
Published: July 2020

A numerical investigation is conducted for a single spin-torque oscillator (STO) under the non-linear region. A large angle precession triggers the generation of multiple modes without any feedbacked circuits and/or magnetic couplings with neighboring oscillators. Our simulations show that a single eigenmode of a given STO can trigger up to six discrete modes as the sideband modes. These findings will offer the new functionality to the STO for developing the spintronic logic circuits.
Effect of feeding forage or concentrate starter diets in early life on life-time growth, carcass traits and meat quality of Wagyu × Friesian cattle
Authors: Burggraaf V. T. , Craigie C. R. , Khan M. A. , Muir P. D. , Thomson B. C. , Lowe K. A. , Leath S. R. , Taukiri K. R. , Staincliffe M. , McCoard S. A.
Published: July 2020

Context Nutrition in early life can affect the long-term performance of livestock. Aims The present study evaluated the effects of rearing Wagyu × Holstein Friesian heifer calves either on a concentrate pelleted starter (CS; 90% DM, 19.3% crude protein (CP), and 13.8 MJ metabolisable energy (ME) per kilogram DM) or a forage starter (FS, ensiled alfalfa, Medicago sativa; 45% DM, 18.5% CP and 9.7 MJ metabolisable energy per kilogram DM) on lifetime growth, blood metabolites, carcass traits and meat quality. Methods Calves (n = 60) were allocated either to CS or FS diets. All calves received their solid feeds ad libitum from Week 1 and were fed milk in group pens (n = 10/pen) at 4 L/calf.day until Week 7, then 2 L/calf.day for 2 weeks. Calves were transferred to pasture 1 week after milk removal, with starter feeds removed by Week 15. All heifers were then managed as one group on a pasture-based diet until slaughter at 26–30 months of age (average of 483 kg liveweight). Key results Calves offered the CS diet were 14 kg heavier than were calves on the FS diet at 15 weeks (P < 0.001). However, liveweight was similar between the groups by the time of slaughter (P > 0.1). All blood parameters studied were similar (P > 0.05) between the treatments at 12 months and at slaughter. Depth of eye muscle and subcutaneous fat, measured using ultrasonography before slaughter, carcass weight and meat pH, marbling, shear force, moisture loss during cooking, total fat and fat and meat colour were also similar between the treatments (P > 0.05). Some potential was found for using blood markers to predict carcass traits and meat quality. Conclusions Solid feed type during rearing had little effect on liveweight or meat characteristics from 12 months of age to slaughter of Wagyu × Friesian heifers. Implications Calves can be reared on FS diets with similar long-term production performance as on CS diets.
Conflicting Worldviews: Shaykh Aḥmad al-Aḥsāʾī’sRisālat al-Rashtīyahand the Problematic ofAkbarīanMysticism
Authors: Chamankhah Leila
Published: July 2020

Since its earliest exposure to Iranian Sufis in the mid-seventh century, Ibn ʿArabī’s mysticism has been the subject of lively discussion and examination. It has also left its imprint on many intellectual tendencies, particularly Sufism, esotericism andḥikmatdiscourse. The way Ibn ʿArabī’s books were read, interpreted and commented upon by his Iranian followers is indicative of the fact that al-Shaykh al-Akbar was too grand a figure to ignore. Even scholars such as Shaykh Aḥmad al-Aḥsāʾī (d. 1241 AH/1826), who never hesitated in showing his distaste for Mumīt al-Dīn Ibn ʿArabī in one way or another, was influenced by his discourse. However, despite the general interest of a few scholars in al-Aḥsāʾī’s so-called “love–hate relationship” withAkbarīanmysticism, our knowledge of the nature of this relationship is quite limited. Different dimensions need to be examined to see how these two apparently conflicting worldviews understood mysticism and its fundamental tenets, including the doctrines ofwilāya, theophany (tajallī),tawḥīdand divine knowledge. This article cites and analyzes al-Aḥsāʾī’s key texts, focusing onRisālat al-Rashtīyah, to examine how he understands Akbarīan mysticism, and how he develops his alternative by emphasizing a definition of the correct mysticism (maʿrifah/gnosis) in its relation to the teachings of the imāms. It explains how by distancing himself from Sufism in general, and from Ibn ʿArabī’s mysticism in particular, al-Aḥsāʾī seeks to draw the boundaries of the Shaykhī cause, not only as the true representative of Twelver Shīʿīsm, but also as the arch enemy of Ibn ʿArabī’s teachings that were but misunderstandings of Islam and of the teachings of the imāms.
Quantifying configurational information for a stochastic particle in a flow-field
Authors: Tang Evelyn , Golestanian Ramin
Published: July 2020

Flow-fields are ubiquitous systems that are able to transport vital signaling molecules necessary for system function. While information regarding the location and transport of such particles is often crucial, it is not well-understood how to quantify the information in such stochastic systems. Using the framework of nonequilibrium statistical physics, we develop theoretical tools to address this question. We observe that rotation in a flow-field does not explicitly appear in the generalized potential that governs the rate of system entropy production. Specifically, in the neighborhood of a flow-field, rotation contributes to the information content only in the presence of strain—and then with a comparatively weaker contribution than strain and at higher orders in time. Indeed, strain and especially the flow divergence, contribute most strongly to transport properties such as particle residence time and the rate of information change. These results shed light on how information can be analyzed and controlled in complex artificial and living flow-based systems.
Numerical modelling of mangrove merged with seawall for investigating wave mitigation over flat topography
Authors: Iryanto  , Bunga M S , Mustamiin M , Magdalena I , Erwina N
Published: July 2020

In this study, numerical modelling to see the effect of mangrove merged with seawall on wave mitigation over flat topography is developed. The model is based on Navier-Stokes equations. Resistance of the mangrove is described using Manning friction, whereas the seawall is created from particles and added directly to the topography. Numerical solution of the model is solved using Smoothed Particle Hydrodynamics (SPH). Two types of seawalls; vertical and incline seawall are used. Results of the numerical simulations show that existence of the mangrove merged with vertical seawall can reduce 10.52191% in wave height and prevent the wave to pass the seawall. Whereas the existence of the mangrove merged with incline seawall can reduce 15.39512% in wave height but the wave still passes the seawall.
Pre-service teacher’s pedagogical content knowledge: What teachers know about students’ errors?
Authors: Setyaningrum W , Mahmudi A , Murdanu
Published: July 2020

Content knowledge is one of the important aspect for the improvement of teaching and learning, attention to its development and study has been conducted frequently. This study was intended to explore the pedagogical content knowledge of mathematics pre-service teachers in Indonesia. This descriptive qualitative study involving twenty five pre-service teachers enrolled in mathematics education department in one university in Yogyakarta. The collected data of the pedagogical content knowledge were examined by using descriptive analysis. This study revealed that many pre-service mathematics teachers could identify students’ errors. Nevertheless, they struggle to provide alternate ways to minimize the errors. The possible reasons behind these findings are discussed.
Classification of Open Unemployment Rate in Indonesia with Mamdani Fuzzy Inference System
Authors: Kurniasari Y , Suseta B , Hendiyani N , Abadi A M
Published: July 2020

Unemployment is a very common problem in developing countries such as Indonesia. One of the government’s efforts to overcome the problem is having skill training. However, the labor often faced difficulties in classifying unemployment in Indonesia. Therefore, the utilization of fuzzy logic is considered as an appropriate way to examine the state’s open unemployment rate by Mamdani method implementation. The input used in this case is the number of unemployment and labor force whereas the output of this system is the classification of open unemployment rate. Then the model output is compared to the classified data of the labor service and the result indicates that a matching percentage of 70,6 percent. It shows that the fuzzy model is able to determine the open unemployment rate in Indonesia.
A spatial shared component random intercept model for assessing risk of diarrhea among men and women
Authors: Kismiantini  , Jaya I G N M
Published: July 2020

Diarrhea becomes a severe problem for children under five years of age. A preventive action is needed to minimize the negative effect of diarrhea. Gender risk assessment may be necessary to control diarrhea transmission as different sexes have distinct healthy behaviour. We develop a collection of candidate models of Bayesian shared component random intercept models to identify a gender group’s spatial risk of diarrhea. The candidate models include Poisson-Inverse Gamma and Negative Binomial-Inverse Gamma models with different values hyperprior parameters. The results showed that the Negative-Inverse Gamma model performed better than the Poisson-Inverse Gamma with respect to the existence of overdispersion in the data. The spatial patterns of diarrhea for men and women were similar. In some sub-districts, however, it indicated that women at two different locations had a higher risk of diarrhea compared to men.
Junior high school student’s reflective thinking process in solving the mathematics problem of triangle and rectangular materials based on the local content
Authors: Haejelia M , Noer SH
Published: July 2020

The ability of reflective thinking is the ability to connect the knowledge which students get with the preseding knowledge, so there are conclusions to solve new problems. In order to motivate the students to solve the problems given, the researcher wants to associate the mathematical problems that are given to the students by associating something which which was the local context to them. This study describes the reflective thinking of students in solving triangular and rectangular mathematical problems. This study used a qualitative descriptive study with the students of class VIIIC at SMP Negeri 17 Pesawaran as a research subject consisting of 32 students which was taken by 5 students. The five subjects are all the students who fulfill all the reflective thinking indicators. The instrument used was a written test in the form of 4 description questions and in the interview’s guidelines conducted on the 5 students. Based on the research, the results obtained the students reflective thinking description in solving the mathematical problems which were the three subjects who are able to think reflective in solving mathematical problems and two subjects are quite capable of reflective thinking in solving mathematical problems.
Didactical design of square circumference based on Petak Umpet traditional game in Elementary School
Authors: Nur’aeni E , Oktaviani L , Apriani I F
Published: July 2020

This research is inspired by the preliminary study that showing learning obstacles experienced by the students in comprehending square circumference concept. The students do not have total comprehension in understanding the square circumference because their low comprehension when studying it for the first time. It becomes the main background in solving the square circumference problems. It is required to create learning design to solve the problems. The researchers create a didactic design based on PetakUmpet traditional game in order to help the students to understand square circumference concept and also to preserve traditional cultures. Research methodology is using Didactical Design Research(DDR) with three level of analysis, there are: prospective analysis, metapedadidacticanalysis and retrospective analysis. Data collection technique is using triangulation (interview, observation and documentation). This research produces a teaching media as learning design in the form of lesson plan developed as an alternative learning design that can be used on square circumference concept in elementary school.
The effect of Kumon learning model on mathematics learning outcomes in cognitive style view
Authors: Sulasteri S , Suharti  , Amri M , Halimah A , Kusumayanti A
Published: July 2020

This study aimed to determine the effect of Kumon learning model on mathematics learning outcomes in cognitive style view in the Eighth grade students of SMPN 21 Makassar. The research design was quasi experiment with factorial design. The population of this study was the Eighth grade students of SMPN 21 Makassar and the sample technique used was random sampling. The instruments of this study were mathematics learning achievement test, which was divided into pretest and posttest, and GEFT (Get Embed Figure Test) which aimed to categorize the students into two types, FI (field independent) and FD (field dependent). The results indicated that the average improvement of mathematics learning outcomes by applying Kumon model in experimental class increased 34.06% and only 28.83% for control class in the eighth grade students of SMPN 21 Makassar. It could be concluded that the students with FI cognitive style using Kumon model had higher learning outcomes than the students with FI cognitive style taught without Kumon model. And the researcher did not find any significant differences on the students’ learning outcomes of FD cognitive styles in experimental class and control class. Therefore, it could be concluded that Kumon learning model affected the mathematics learning outcomes in cognitive style view in the Eighth grade students of SMPN 21 Makassar.
Ethnomathematics: Mathematical concepts in Tapis Lampung
Authors: Susiana  , Caswita  , Noer S H
Published: July 2020

The existence of ethnomatematics has existed since long ago. This is seen from various mathematical concepts that have become part of the life and traditions of society. One of them is contained in tapis Lampung. Tapis Lampung has motifs and patterns that describe the philosophy of Lampung people. Each motif has meaning and symbol in the pattern of cultural life. The process of developing Tapis Lampung has had a major impact on the economy of the community and significantly increased the potential of cultural tourism in exploring the wealth of the Indonesian art heritage. This process of introducing culture in a mathematical perspective better known as ethnomatematics. This concept has become the basis of society in using mathematics in life. This study aims to examine the philosophy contained in motifs of tapis and analyze the mathematical concept to find an ethnomatematics approach in mathematics learning. in various types of tapis Lampung including: Tapis Cucuk Pinggir, Tapis Jung Sarat, Tapis Limar Sekebar. Mathematics concept include One-Dimentional Geometry and Two-Dimentional Geometry, Geometry Transformation includes: concepts of reflection, dilation and rotation.
Mapping of mathematics topics that can be integrated their learning utilizing calculator
Authors: Retnawati H , Wijaya A , Yunianto W , Laksmiwati P A , Meilina M , Amanti P G , Irawan R
Published: July 2020

Calculator is one of technology product that can be integrated with mathematics learning. However, mathematics topics that require calculator in teaching and learning process haven’t been identified. This research was revealed to map the school mathematics topics that can be integrated into learning using calculator. This research was a qualitative study, with a content analysis approach. Initially, a focus group discussion (FGD) was held regarding the format of mapping mathematical material. The FGD participants were officials from the education office at the Ministry of Education and Culture, staff from Casio Education Singapore, and reviewers from various universities that had mathematics education study program in Yogyakarta Indonesia. The mathematics topics from elementary school, junior high school, high school and vocational school were mapped, which basic competencies can use a calculator in learning. The results showed that most of the basic competencies in elementary, junior high, high school, and vocational school could integrate their learning using calculator. These uses were categorized into exploration, representation, computation and affirmation. The dominant features of scientific calculator were also mapped at each school level.
Facilitating pedagogical content knowledge development through professional development intervention
Authors: Barut M E O , Wijaya A
Published: July 2020

Teacher has main responsibility to accommodate all students and their learning needs in dynamic classroom situations. This goal can be accomplished if teacher can organize high quality teaching practice to support student’s success. So that teachers must be equipped with wide range of knowledge about how particular mathematics topics, problems, or issues are organized, represented, and adapted to the diverse interests and abilities of learners. Such knowledge is known as Pedagogical Content Knowledge (PCK). Many studies have proven PCK as professional knowledge that should be acquired by teacher to make effective teaching. Considering its importance, there must be systematic effort to develop pedagogical content knowledge through professional development. Teacher professional development has been used as the most effective approach to promote teacher change. Accordingly, the purpose of this paper is to explore ways to develop PCK in professional development intervention. The method used in this study is literature review. The review revealed that professional development intervention with collaborative-reflective situation such as: lesson study, analysing student’s work, analysing video of classroom practices, or construction of Content of Representation (CoRe) and Pedagogical and Professional Experience Repertoires (PapeRs) – based program, has positive impact to develop teacher’s pedagogical content knowledge.
Game “STATIC”: Is it effective for students’ conceptual understanding?
Authors: Salsabila N H , Setyaningrum W
Published: July 2020

The research aims to describe the effectiveness of game based learning in improving students’ mathematics conceptual understanding. The game used in this research is called STATIC (Statistics in Arctic) which can be accessed using smartphone. The game was developed using the ADDIE model which consisted of 5 phases, analysis, design, development, implementation, and evaluation. The game has met the valid and practical aspects. The participants of this research were 33 students of 8th junior high school. The students’ conceptual understanding is measured using multiple choice tests. The result showed that 76% of students have passed the Minimum Completeness Criteria scores in students’ conceptual understanding test. It implies that the STATIC game could be used to improve students’ conceptual understanding. Therefore it could be one of instructional media for teachers.
How to improve critical thinking skills and spatial reasoning with augmented reality in mathematics learning?
Authors: Anggraini S , Setyaningrum W , Retnawati H , Marsigit
Published: July 2020

Critical thinking skills and spatial reasoning are important aspect in human life. On the other hand, currently, implementing augmented reality in many fields be a trend, including in education field. This study aims to explain how to improve critical thinking skills and spatial reasoning with augmented reality in mathematics learning. The method used in this research is literature review. The data obtained from scientific journals, conference proceedings, and other relevant sources. The results show that to improve spatial reasoning can be done by utilizing its features that can develop confidence of learners, facilitate student-centered learning, create problem solving, and create interactive learning. Besides that, spatial reasoning can be improved by designing dynamic objects with AR. Dynamic objects permit learners to view objects from different sides. Therefore, active learning can be promoted.
The Potential of GeoGebra Exploration in Supporting Multiple Representation Ability
Authors: Arifah A N , Sugiman
Published: July 2020

The ability of multiple representations is an essential ability to solve problems in learning mathematics. Problems in learning mathematics are still a matter of material that is too abstract. The way to reduce the abstractness is to convert them into representations that are easier to understand. In learning mathematics, there is software that can provide various forms of representations (symbolic, visual, and verbal), namely GeoGebra. The purpose of this study is to describe the ability of multiple representations through the potential of GeoGebra exploration. This study uses quantitative and qualitative methods (mixed methods) with convergent parallel strategies. Data taken through tests, response questionnaires, and observations. The results show that the ability of multiple representations that appear in the form of symbolic, visual, and verbal representations with the percentage of students sequentially by 81%, 100%, and 81%. This is supported by the results of a positive student response questionnaire to the potential of GeoGebra exploration regarding student interest in learning mathematics when using GeoGebra and the ability of students to display multiple representations of mathematical material through GeoGebra.
Thermal Deformation Test and Modeling of Main Spindle of Numerical Control Vertical Machining Center
Authors: Xiao Qijun , Luo Zhonghui , Luo Mei , Liu Shihsheng , Hsu Weitai , Huang Chiawei
Published: July 2020

Thermal error is the main factor affecting the manufacturing accuracy of the numerical control vertical machining center. The thermal deformation of the machine spindle is the main source of machine tool thermal error. In view of the deficiency of single factor modeling of thermal deformation of spindle of traditional machine tools, it is measured in this paper the temperature rise and Z-axis thermal deformation of a vertical machining center under several rotating speed conditions, the test data is analyzed and processed, and the relationship curves of thermal deformation of the spindle relative to time and temperature rise under several working conditions are drawn. Binary linear regression analysis model and artificial neural network model for thermal deformation of the spindle are presented. By comparing the residual error of these two modeling methods, the error for binary regression modeling is from −7.5μm to 10μm, however, the error for neural network modeling is from −5.5μm to 8.1μm, it is shown that neural network modeling is superior to binary regression modeling.
Resolution matters when modeling climate change in headwaters of the Colorado River
Authors: Foster Lauren M , Williams Kenneth H , Maxwell Reed M
Published: July 2020

The continued growth of Southwestern cities depends on reliable water export from Rocky Mountain headwaters, which provide ∼85% of Colorado River Basin (CRB) streamflow. Despite being more sensitive to warming temperatures, alpine systems are simplified in the regional-scale models currently in use to plan for future water supply. We used an integrated hydrologic model that couples groundwater and surface water with snow and vegetation processes to examine the effect of topographic simplifications as a result of grid coarsening in a representative CRB headwater basin. High-resolution (100 m) simulations predicted headwater streamflow losses of 16% by 2050 while coarse-resolution (1 km) simulations predict only 12%, suggesting that regional-scale models (coarser than 1 km) likely overestimate future Colorado River Basin water supplies.
Heat Pumps for Central Russia: Problems and Solutions
Authors: Krylov E
Published: July 2020

The article discusses the prospects of saving resources when using heat pumps for heating buildings. Based on climate data and new regulations in the construction industry, an indicator of the specific consumption of heat energy for heating one square meter of area for the central Russia is determined. For a typical building, it is shown that, in terms of the total cost of operation, a heat pump installation can successfully compete with an electric boiler and a liquid fuel boiler. The main problems that impede the wider introduction of heat pumps in Russia are identified. An example of a heating unit based on heat pumps for a rural school building is given.
CFD Simulation of Multi-Outdoor Unit Configuration Design for a Building
Authors: Ba Chien Nguyen , Viet Dung Nguyen , Quoc Dung Trinh , Tien Cuong Nguyen , Hiep Le Kieu
Published: July 2020

In this work, we investigate a numerical analysis of outdoor unit (ODU) configuration design by a three-dimensional steady Reynolds-averaged Navier–Stokes computational fluid dynamic simulation. The model was conducted from an actual building design with 10 floors and 5 ODUs each. The numerical results were used to trace back the ODUs in which the insufficient heat reject may happen. The velocity, temperature and pressure distribution were also analyzed. The importance of avoiding air recirculation around the OUDs is presented. Finally, by evaluating the airflow, this approach can significantly reduce the designing fault and help designers determine the ideal position of OUDs.
Multi-objective Optimization of Solar System Sizing in Households with Common Heat Sources
Authors: Novotny J , Matuska T
Published: July 2020

According to following worldwide trend to decrease energy and environmental performance of the building sector, the utilization of renewable energy sources represents a key toward sustainable buildings. The aim of this paper is to introduce an optimization methodology for solar system sizing (photovoltaics and solar thermal collectors) with using a multi-objective optimization for single family house with space heating, domestic hot water preparation and user/appliances electricity consideration. Optimization is based on three objectives: non-renewable primary energy, carbon emissions and total costs. Optimization procedure is performed by interconnection of simulation tool TRNSYS and MATLAB with using genetic algorithm. In TRNSYS, four different heat sources (electric heater, natural gas boiler, wooden fuel boiler and air source heat pump) combined with photovoltaic and solar thermal system have been modelled. Presented case study provides results of optimization for given family house.
The Impact of Ceiling Geometry and its Sensitivity on Daylighting and Energy Performance of Skylights
Authors: Irakoze Amina , Han Kim Kee
Published: July 2020

This study aimed at the assessment of the actual building ceiling depth on the predictions of skylight performance. Using the integrated Radiance and EnergyPlus simulation tools, daylighting and energy performance of skylight to roof ratios from 1% to 25% with a ceiling depth of 1.5 m to 3 m were assessed and analyzed. The results showed that including the ceiling depth into simulation model greatly affected the predictions of the skylight performance. Through a sensitivity analysis, the study indicated that the impact of ceiling geometry increased as the skylight’s contribution to the reduction of building energy consumption increased with 6% skylight to roof ratio being the most sensitive to the ceiling depth. The integrated daylighting and building energy optimization concluded that 8%, 9%, 10% and 11% skylight to roof ratios were optimal for a ceiling depth of 1.5 m, 2 m, 2.5 m and 3 m, respectively. The results induced that for skylight related investigations, building ceiling geometry should be included in the simulation models as it plays a crucial role in the actual performance of skylights.
An Energy Evaluation of Multi-residential Buildings in South Korea Using Gas Utilities
Authors: Sung Choi Han , Han Kim Kee
Published: July 2020

The purpose of this study was to evaluate energy performance of existing multi-residential buildings and classify them according to their energy efficiencies. 200 households from four different aging multi-residential buildings were selected and analyzed. By applying monthly gas consumption of a whole year to Inverse Model Toolkit, the heating slope and change-point temperature coefficients were calculated and used for energy performance evaluation. As a result, the older buildings were classified to the category of the poor energy performer that needs to be remodeled for improving their energy efficiency.
A Calculation of Energy Consumption for Residential Air Conditioners using Bin Method in the Vietnamese Climatic Conditions
Authors: Dung Trinh Quoc , Anh Vu Tuan , Dzung Nguyen Viet , Luong Pham Hoang , Ha Thi Tran Thu
Published: July 2020

The paper presents the calculations of energy consumption of residential air conditioners using bin method in the Vietnamese climate. Data of 48 types of the air-cooled air conditioners (i.e. 24 non-inverter and 24 inverter) made by 6 main manufacturers in the Vietnamese market have been used in this work. The nominal cooling capacity of the air conditioners is in the range of 9000 BTU/h and 24000 BTU/h. Based on the climate data gathering from 1983 to 2000 according to the National technical regulation on climatic data for building of the Ministry of Construction (QCVN 02:2009), the reference outdoor temperature bin distribution was established in the paper. The calculations of the energy consumption have been carried out for cities, namely Hanoi, Da Nang, and Ho Chi Minh city which are representatives of 3 typical climatic zones in Vietnam. The results show that the cooling seasonal energy consumption of the inverter air conditioners is lower than those with non-inverter compressors. Energy consumption for the air conditioners of the manufacturers and the impact of the climate conditions on efficiency were investigated in the study, also. The cooling seasonal performance factor ( ) and assessment of CO2 emissions of different types of air conditioners (i.e. water-cooled air conditioner, etc) for buildings in Vietnam will be shown in the next papers.
Spring-back of Wood after Longitudinal Compression
Authors: Báder M , Németh R
Published: July 2020

Longitudinal compression of natural wood makes it easier to bend. Fixation after compression results in improved changes in the properties of this environmentally friendly material. The usage of this modified wood helps to make curved wood products with much less waste, without chemicals. Using 20% compression ratio followed by fixation for 1 minute results in optimal properties for laboratory investigations. As a result of this treatment, oak wood is shortened averagely by 3.84% due to its natural spring-back ability. The aim of this study is to determine not only the level, but the duration of spring-back of wood after its longitudinal compression. Wood remains always a living organism with a natural structure, actively responding to environmental conditions such as temperature and humidity of the air. Its moisture content follows the circumstances and changes its properties, for example, it shrinks when its moisture content decreases. Longitudinal compression (aka pleating) multiplies the dimension change of wood in its longitudinal direction, compared to untreated wood. In this study, the remaining shortening of pleated wood was averagely 5.50% after spring-back and drying shrinkage.
Review on Present Situation of Groundwater Scenario on Kolkata Municipal Area
Authors: Bose S , Mazumdar A , Basu S
Published: July 2020

Kolkata is one of the most important city in Asian subcontinent. River Ganga is on its west. Kolkata located on gangetic deltaic plain. It is situated on Bengal basin. A typical groundwater situation exists in Kolkata municipality area. The presence of semi confined and confined aquifers can be observed. Different types of study on the scenario of groundwater on Kolkata municipal area has already been discussed they have contributed their valuable observation regarding this. A certain amount of daily consumption of water is to be fulfilled by extraction of groundwater. Urban development in this city is making an adverse effect on groundwater. Several types of hydro chemical composition can be observed in groundwater. There is possibility of presence of harmful arsenic in certain places. Due to extensive extraction of groundwater, possibility of land subsidence can affect as consequence. As for further study, there is limited scope due to unavailability of updated dataset. There should be strict governance and fruitful implementation to maintain sustainability of groundwater. This paper further studies on groundwater situation on municipal area of Kolkata with overall perspective and informative manner.