bluuebunny/crossref_metadata_2025 huggingface dataset:
The Effect of Charge on Melittin-Induced Changes in Membrane Structure and Morphology
Authors: Lee Tzong-Hsien , Hall Kristopher , Aguilar Marie-Isabel
Published: December 2019

The binding of melittin to a range of phospholipid bilayers was studied using dual polarisation interferometry and atomic force microscopy. The phospholipid model membranes included zwitterionic dimyristylphosphatidylcholine (DMPC), together with mixtures of DMPC/dimyristylphosphatidylglycerol (DMPG) and DMPC/DMPG/cholesterol. Melittin caused significant disruption on all bilayers, but differences in morphological changes during binding were different on each membrane. Overall, the results demonstrate that the process of membrane disruption follows distinct structural changes for different lipid mixtures irrespective of the strength of binding to the membrane surface.
The psychosocial impacts of wildland fires on children, adolescents and family functioning: a scoping review
Authors: Kulig Judith C. , Dabravolskaj Julia
Published: December 2019

Disasters have become increasingly common, calling for the need to more fully understand the impacts of such events. This article presents a scoping review of the psychosocial impacts of wildland fires on children, adolescents and family functioning. We identified 19 research articles and reviewed them according to the following characteristics: date and location of the fire, study time period, study design, instrument(s), sample and findings. The studies were primarily conducted within Australia, the US and Canada. The results identified factors that are linked to the impact of wildfires on children, adolescents and families. Age, gender, time, and proximity to the wildfire can impact both children and adolescents while behaviours of family members and home and property loss are important among families. Our understanding of the topic is limited because of the low number of studies, small sample sizes and inconsistent use of age groups and instruments. Future investigations would benefit by being placed within a disaster framework. Other recommendations include focusing specifically on family units, children and adolescents as the primary participants to generate more information about the aftermath of the fire event and conducting longitudinal studies with established scales to allow for comparisons.
Photodissociation transition states characterized by chirped pulse millimeter wave spectroscopy
Authors: Prozument Kirill , Baraban Joshua H. , Changala P. Bryan , Park G. Barratt , Shaver Rachel G. , Muenter John S. , Klippenstein Stephen J. , Chernyak Vladimir Y. , Field Robert W.
Published: December 2019

Significance

Transition states control results of molecular reactions. However, it is difficult to extract details about the transition state solely from the chemical products born from the transition state. This inability to experimentally characterize transition state limits our ability to predict and steer the outcomes of chemical processes. Here we describe the use of a recently developed, simultaneously broadband and high-resolution technique, chirped-pulse millimeter-wave spectroscopy, to measure the nascent product state distribution that results from the photolysis of vinyl cyanide and, from it, to infer properties of the transition state(s) involved. Insights gleaned from studies such as these are crucial to a detailed understanding of molecular quantum dynamics at a level that promises to allow us to calculate and manipulate chemistry.
Acquisition of quantified partitivity in Catalan-Spanish bilingualism
Authors: Soto-Corominas Adriana
Published: December 2019

Child-level factors such as input quantity and quality have received little attention by studies of bilingual
language acquisition in situations of societal bilingualism. The present study addresses this gap by investigating the acquisition
of quantified partitivity in Catalan-Spanish bilingualism. The two languages present different licensing conditions for noun
ellipsis in quantified partitive objects: Catalan requires quantitative clitic en whereas Spanish requires only the quantifier.
Bilingual participants (N = 338), ages 4–9, were administered two Oral Production Tasks, one for each language.
Analyses of participants’ responses showed that a different combination of child-level factors accounted for their performance in
each language, revealing dominance effects. Once participants were classified into three groups (Catalan-dominant, Balanced
bilingual, and Spanish-dominant) according to their language dominance, between-group differences were found in each language with
respect to the acquisition timeline of the respective structure.
Left is right, right is not
Authors: Her One-Soon , Tsai Hui-Chin
Published: December 2019

This paper argues for the left-branching constituency of the Chinese classifier phrase and demonstrates that the right-branching approach assumed by the majority of current syntactic works is not viable. The rejection of the right-branching approach entails the rejection of the “split” approach, where both left- and right-branching structures are required. In this debate, we offer a vital fresh perspective from the syntax and mathematics of complex numerals. We examine the right-branching argumentation inA. Li (2014), which, crucially, extendsIonin & Matushansky’s (2006)non-constituent account of complex numerals, e.g.two hundred, in non-classifier languages like English to Chinese and must rely on ellipsis and a silent element YIDIAR ‘a bit’. Yet, complex numerals in Chinese, e.g.liang bai‘200’, are in fact constituents (He 2015), and the alleged YIDIAR ‘a bit’ does affect the semantics of the noun phrase and is thus by definition illicit (Her & Tsai 2014;2015). Other evidence comes from Chinese synchronic and diachronic syntax as well as the typology of classifier word orders. While the overall argumentation centers on Chinese, it has significant cross-linguistic implications.
The use of the Korean first person possessive pronounnayvis-à-viswuli
Authors: Lee Hye-Kyung
Published: December 2019

This paper takes a corpus-driven approach to the Korean first person possessive pronounnaywith reference to its plural counterpartwuli. The examination of the frequent noun collocates of the two pronouns in Sejong Corpus reveals the close connection betweennayand inalienable entities as well as persons lower than the speaker. Meanwhile,wuliis strongly coupled with places or organizations alongside persons higher than the speaker. Pragmatic principles account for the difference between the kinship term collocates of the two pronouns, such as Horn’s (1984;1989) R-principle orLevinson’s (2000)M-principle. The non-prototypical singular use ofwulitriggers a pragmatic effect of expressing, for example, affection. The frequent collocation ofnaywith foreign/loan nouns is a reflection of the tendency that people more interested in social mobility (younger generation and women) are more ready to employnayrather than the singularwuliand to accept foreign/loan words. The meaning ofnayemerging from its interaction with noun collocates is that it is closely connected with being inalienable, private, or unshared. Meanwhile, the singular meaning ofwuliis pragmatically derived, which is construed as being grouped, deferent, or general.
The structure of Num+CL in the Zhōutún dialect
Authors: Zhou Chenlei
Published: December 2019

The structure of Num+CL in the Zhōutún dialect can be divided into two kinds: VCP and NCP. The VCP in VCP+V is the adverbial, while the NCP can either precede or follow the N it modifies. In NCP+N, the NCP is the attribute; however, in N+NCP, the NCP can be the post-attribute and the adverbial, according to the syntactic property of N. The language contact of the Zhōutún dialect with Amdo Tibetan (AT) plays a role in leading to the peculiarities of Num+CL in the Zhōutún dialect.
Public Libraries as Partners in Confronting the Overdose Crisis: A Qualitative Analysis
Authors: Lowenstein Margaret , Feuerstein-Simon Rachel , Sheni Risha , Dupuis Roxanne , Kinsey Eliza Whiteman , Luna Marti Xochitl , Cannuscio Carolyn
Published: December 2019

Background

The overdose crisis is affecting public libraries. In a 2017 survey of public librarians, half reported providing patrons support regarding substance use and mental health in the previous month, and 12% reported on-site drug overdose at their library in the previous year. Given the magnitude of the overdose crisis and the fact that public libraries host 1.4 billion visits annually, our aim was to understand how libraries currently assist with substance use and overdose and how they can further address these issues.

Methods

We conducted semi-structured interviews with 44 public library staff from across the U.S. attending a national meeting in March 2018. Interviews addressed attitudes and experiences regarding drug use, overdose, and overdose response in libraries. We analyzed interviews using thematic content analysis guided by the Consolidated Framework for Implementation Research.

Results

Participants were from 26 states. Among libraries in this sample, 14% had experienced an on-site drug overdose and 7% stocked naloxone at the time of study. Nearly all participants reported substance use as a prominent concern among patrons and their families, as well as in the library itself. Many participants were willing to provide support to patrons and even administer naloxone, but they often lacked preparation, resources, or institutional support. Participants also expressed interest in providing information or referrals to people who use drugs (PWUD), but such efforts were often stymied by inadequate community resources. Finally, participants expressed interest in strengthening partnerships between public libraries and health and social service organizations.

Conclusions and Relevance

Public library staff routinely engage PWUD, and based on prior studies, nearly 2,000 of U.S. public libraries can expect an on-site overdose in the next year. Findings from our work highlight the need for further study about how public libraries can act as part of comprehensive, community-based strategies to address the opioid epidemic.
CHC22 clathrin mediates traffic from early secretory compartments for human GLUT4 pathway biogenesis
Authors: Camus Stéphane M. , Camus Marine D. , Figueras-Novoa Carmen , Boncompain Gaelle , Sadacca L. Amanda , Esk Christopher , Bigot Anne , Gould Gwyn W. , Kioumourtzoglou Dimitrios , Perez Franck , Bryant Nia J. , Mukherjee Shaeri , Brodsky Frances M.
Published: December 2019

Glucose transporter 4 (GLUT4) is sequestered inside muscle and fat and then released by vesicle traffic to the cell surface in response to postprandial insulin for blood glucose clearance. Here, we map the biogenesis of this GLUT4 traffic pathway in humans, which involves clathrin isoform CHC22. We observe that GLUT4 transits through the early secretory pathway more slowly than the constitutively secreted GLUT1 transporter and localize CHC22 to the ER-to-Golgi intermediate compartment (ERGIC). CHC22 functions in transport from the ERGIC, as demonstrated by an essential role in forming the replication vacuole of Legionella pneumophila bacteria, which requires ERGIC-derived membrane. CHC22 complexes with ERGIC tether p115, GLUT4, and sortilin, and downregulation of either p115 or CHC22, but not GM130 or sortilin, abrogates insulin-responsive GLUT4 release. This indicates that CHC22 traffic initiates human GLUT4 sequestration from the ERGIC and defines a role for CHC22 in addition to retrograde sorting of GLUT4 after endocytic recapture, enhancing pathways for GLUT4 sequestration in humans relative to mice, which lack CHC22.
Septin2 mediates podosome maturation and endothelial cell invasion associated with angiogenesis
Authors: Collins Kerrie B. , Kang Hojin , Matsche Jacob , Klomp Jennifer E. , Rehman Jalees , Malik Asrar B. , Karginov Andrei V.
Published: December 2019

Podosomes are compartmentalized actin-rich adhesions, defined by their ability to locally secrete proteases and remodel extracellular matrix. Matrix remodeling by endothelial podosomes facilitates invasion and thereby vessel formation. However, the mechanisms underlying endothelial podosome formation and function remain unclear. Here, we demonstrate that Septin2, Septin6, and Septin7 are required for maturation of nascent endothelial podosomes into matrix-degrading organelles. We show that podosome development occurs through initial mobilization of the scaffolding protein Tks5 and F-actin accumulation, followed by later recruitment of Septin2. Septin2 localizes around the perimeter of podosomes in close proximity to the basolateral plasma membrane, and phosphoinositide-binding residues of Septin2 are required for podosome function. Combined, our results suggest that the septin cytoskeleton forms a diffusive barrier around nascent podosomes to promote their maturation. Finally, we show that Septin2-mediated regulation of podosomes is critical for endothelial cell invasion associated with angiogenesis. Therefore, targeting of Septin2-mediated podosome formation is a potentially attractive anti-angiogenesis strategy.
Multiple Killing horizons: the initial value formulation for

Λ

-vacuum
Authors: Mars Marc , Paetz Tim-Torben , Senovilla José M M
Published: December 2019

In Mars et al (2018 Class. Quantum Grav. 35 155015) we have introduced the notion of ‘multiple Killing horizon’ and analyzed some of its general properties. Multiple Killing horizons are Killing horizons for two or more linearly independent Killing vectors simultaneously. In this paper we focus on the vacuum case, possibly with cosmological constant, and study the emergence of multiple Killing horizons in terms of characteristic initial value problems for two transversally intersecting null hypersurfaces. As a relevant outcome, a more general definition of near horizon geometry is put forward. This new definition avoids the use of Gaussian null coordinates associated to the corresponding degenerate Killing vector and thereby allows for inclusion of its fixed points.
Five degrees of freedom test mass readout via optical levers
Authors: Huarcaya V , Apelbaum G , Haendchen V , Wang Q , Heinzel G , Mehmet M
Published: December 2019

High precision measurement of all six degrees of freedom of freely floating test masses is necessary for future gravitational space missions as the sensing noise is frequently a limiting factor in the overall performance of the instrument. Femto-meter sensitivity has been demonstrated with LISA Pathfinder which used a complex laser interferometric setup. However, these measurements where restricted to the length changes in one degree of freedom only. When aiming for sensing multiple degrees of freedom, typically capacitive sensing is used, which facilitates a compact setup but does not provide competitive precision. An alternative approach to improve the sensitivity beyond capacitance readout systems and to reduce the complexity of the setup, is to use optical levers. Here, we report on the realization of a test mass sensing system by means of a modulation/demodulation technique in combination with four optical levers detected by quadrant photodiodes. The results of our table-top experiment show that this configuration allows us to extract information on five degrees of freedom of a cubic test mass. With basic off-the-shelf laser diodes we demonstrate an angular resolution of below 600 nrad

at frequencies between 10 mHz and 1 Hz (which is better than a conventional autocollimator) while simultaneously measuring the linear motion of the test mass with a precision of better than 300 nm

in the same frequency band. Extension of the geometry will enable optical sensing of all six degrees of freedom of the test mass.
Adaptive background noise bias suppression in contrast-free ultrasound microvascular imaging
Authors: Nayak Rohit , Fatemi Mostafa , Alizad Azra
Published: December 2019

Non-invasive, contrast-free imaging of small vessel blood flow is diagnostically invaluable for detection, diagnosis and monitoring of disease. Recent advances in ultrafast imaging and tissue clutter-filtering have considerably improved the sensitivity of power Doppler (PD) imaging in detecting small vessel blood flow. However, suppression of tissue clutter exposes the depth-dependent time-gain compensated noise bias that noticeably degrades the PD image. We hypothesized that background suppression of PD images based on noise bias estimated from the entire clutter-filtered singular value spectrum can considerably improve flow signal visualization compared to currently existing techniques.

To test our hypothesis, in vivo experiments were conducted on suspicious breast lesions in 10 subjects and deep-seated hepatic and renal microvasculatures in four healthy volunteers. Ultrasound PD images were acquired using a clinical ultrasound scanner, implemented with compounded plane wave imaging. The time gain compensated noise field was computed from the clutter-filtered Doppler ensemble (CFDE) based on its local spatio-temporal correlation, combined with low-rank signal estimation. Subsequently, the background bias in the PD images was suppressed by subtracting the estimated noise field.

Background-suppressed PD images obtained using the proposed technique substantially improved visualization of the blood flow signal. The background bias in the noise suppressed PD images varied  <0.6 dB, independent of depth, which otherwise increased up to 13.8 dB. Further, the results demonstrated that the proposed technique efficaciously suppressed the background noise bias associated with smaller Doppler ensembles, which are challenging due to increased overlap between blood flow and noise components in the singular value spectrum.

These preliminary results demonstrate the utility of the proposed technique to improve the visualization of small vessel blood flow in contrast-free PD images. The results of this feasibility study were encouraging, and warrant further development and additional in vivo validation.
Characteristics and Optical Properties of Fluorine Doped SnO2 Thin Film Prepared by a Sol–Gel Spin Coating
Authors: Susilawati  , Doyan A. , Muliyadi L. , Hakim S. , Taufik M. , Nazarudin
Published: December 2019

This study aims to determine the optical properties of thin films which include absorbance, transmittance, energy band gap, and activation energy characterized by UV-Visible spectrophotometer (UV-vis) with a wavelength of 200-1100 nm. Tin dioxide (SnO2) films are prepared by doping various Fluoride ion (F-) concentrations (0, 5, 10, 15, 20 and 25%) on glass substrates using the sol-gel spin coating method. The absorption edge of SnO2 thin films was found to accrue from 2.90 to 4.41 at 300 nm wavelength when the F- doped concentration increased from 0 to 25%. Furthermore, the transmittance also increased from 65.5 to 97.8% towards the wavelengths from 300 to 350 nm. However, the band gap and activation energies obtained decreased with a percentage increase in fluorine doping. The energy band gap decreased from 3.55-3.41 eV and 3.90-3.84 eV for direct as well as indirect allowed respectively, while the activation energy decreased from 4.04-1.99 eV. The band-gap energy of SnO2 thin films also decreased, and the electrons adjustment from the valence to conduction band caused the conductivity of the film to increase.
The effect of immersion temperature using chlorophyll sensitizer (Amaranthus hybridus L.) on the performance of dye-sensitized solar cells
Authors: Nurosyid F. , Pratiwi D. D. , Kusumandari K.
Published: December 2019

This article investigated the effect of immersion temperature on the TiO2 film using chlorophyll extract for dye-sensitized solar cells (DSSC). The chlorophyll was extracted from spinach leaves with ethanol solvent. The solution of spinach extract was used for the immersion process on the TiO2 film. The immersion temperatures were varied of 283 K, 303 K and 323 K. The optical properties of TiO2/dye films were analyzed by UV-Vis and Fourier Transform Infrared (FTIR) spectrophotometers. The DSSCs performance were characterized by I-V meter. The highest absorbance was revealed from the immersion temperature of 303 K. Characteristic of FTIR spectra resulted a maximum transmittance of 67.2% at the frequency peak of 3341 cm−1. Additionally, these results directly proportional with the maximum performance of DSSC at immersion temperature of 303 K. The best performance of DSSCs was obtained the Voc, Isc, and conversion efficiency values of 0.43 V, 0.16 mA and 0.04%, respectively.
Profile of Students’ Creative Thinking Skills using Open-ended Multiple Choice Test in Science Learning
Authors: Pratiwi R. D. , Ashadi  , Sukarmin
Published: December 2019

This study aimed to know the profile of students’ creative thinking skills in grade VII of junior high school during the process of science learning. This study was carried out using quantitative-descriptive method. Data collection were done by using open-ended multiple-choice tests based on students’ creative thinking skills indicators. The test was previously validated by learning evaluation experts. Validity of test items were determined using Karl-Pearson formula related to product moment correlation coefficient. Reliability of tests were determined using Alpha-Cronbach formula. Difficulty level and discriminating power were also used as item parameters development of test instruments in this study. The sample taken in this study was 256 students which consisted of all seventh grade students in SMP Negeri 1 Jaten selected through purposive sampling technique due to identify students’ creative thinking skills. The results of this study showed that students’ creative thinking skills on each indicator were 49% of fluency which was in the low category, 72% of flexibility which was in the medium category, 34% of originality which is in the low category, and 35% of elaboration which is in the low category. The conclusion from this research is that creative thinking skill of the students still was in low category, so that needed a way to enhance it on some indicators.
Misconception Analysis Based on Feedback of Computational Thinking Result of College Students
Authors: Masfuah S , Fakhriyah F
Published: December 2019

This research has purposes to analyse misconceptions of college students based on feedback of their computational thinking test. This descriptive quantitative research involves fourth semester college students of 4C class of primary school education teacher program by using random sampling. The instruments are test instrument consisting of computational thinking indicators and questionnaires semi structured to identify and analyse of factor causing misconception of the students. The results were then analysed descriptively by using cluster analysis and crosschecked to questionnaire and interview results. The findings show computational thinking of the students was within algorithm stage meanwhile misconception is found in movement system material. The causal reasons of the misconception are grouped into 3 clusters. Cluster 1, the students have already understood the concept but their misconception is 33.3%. Cluster 2, misconception of the students is 38.1%. Cluster 3, the students have not understood the concept with percentage 28.6%. The contributing factors to misconception are students’ arguments that animals/plants have similar natures to human, handbook, lecturer’s explanation, scientific name, mathematics calculation, formula, graphic understanding, influences of peer in answering, and students’ experiences in daily life.
Synthesis of birnessite-type manganese oxide from two different reducing agents via solvent-free method and the catalytic activity in degradation of POME
Authors: Awaluddin A , Muhdarina  , Chaerani W , Pratiwi M A , Siregar S S
Published: December 2019

Birnessite-type manganese oxide is multifunction material that has been used in various application and the characteristic depends heavily upon its preparation method. In this study, birnessite-type manganese oxide was synthesized using the reaction between KMnO4 (oxidant) and two different reducing agents i.e., citric acid and oxalic acid via a solvent-free method. The characterization of the birnessite was carried out using X-Ray Diffraction (XRD), Scanning Electron Microscopy-Energy Dispersive X-ray Spectroscopy (SEM-EDX), and Surface Area Analyzer (SAA). Birnessite from this variation of reducing agents showed different levels of crystallinity, diverse morphology, crystal size, and surface area. The birnessite-type was then applied as a catalyst for the degradation of Palm Oil Mill Effluent (POME) with hydrogen peroxide (H2O2) as an oxidant to reduce the concentrations of Chemical Oxygen Demand (COD). The maximum reduction in COD concentration was obtained using the catalyst concentration of 400 and 800 mg/L for reducing agent of as-synthesized catalyst citric acid and oxalic acid. Birnessite-type manganese oxide shows potential as a catalyst in the degradation of POME with citric acid as reducing agents showed better degradation in reducing COD values.
Developing an android-based application (AVALIMA) for chemical literacy evaluation
Authors: Priyambodo Erfan , Ratnaningtyas Eka Nugraheni Anggiyani , Wiyarsi Antuni , Dina  , Lathifa Husna Dini
Published: December 2019

The aim of this research is to determine the feasibility and perceptions of teachers and students about AVALIMA, a based on android application, as a chemical literacy evaluation media. AVALIMA was developed by taking the first stage of 4D model, that is define, design, and develop without disseminate. The initial product of AVALIMA was reviewers by material expert, media expert, and peer reviewers. Furthermore, AVALIMA was also assessed by five chemistry teachers by regarding to six aspects, namely material, science literacy, construction, language, visual appearance, and program performance. AVALIMA was also tried out to ten students in the eleventh grade. The result of the analysis shows that AVALIMA is a good android-based media that can be used to evaluate chemical literacy. According to the reviewers, the application is 88.2% appropriate to be used to evaluate chemical literacy. Meanwhile, according to the students’ response in using this media, it is 86.31% appropriate to be used as media to evaluate their chemical literacy. The teacher’s and the students’ perception toward the application is also very good.
Isolation And Characterization Of Lactic Acid Bacteria (Lab) From Small Intestine Content Of Duck (Anas Sp.) As A Probiotic Candidate
Authors: Nurcahyo Heru , Suyanta  , Dale Abdollah , Yudha Alif Furqon Fadholi
Published: December 2019

A group of lactic acid bacteria (LAB) as a probiotic agent have been known to have a beneficial effect on health chicken. The objectives of this study were to isolate, characterize and determine of the LAB which originated from the small intestine content of domestic duck (Anas sp.) for candidate of probiotic. Isolation, selection and identification of bacteria was done using de Man Rogosa Sharpe (MRS) agar + 1% bromocresol purple. Characterization of bacteria based on morphological by Gram staining methods, and identification of biochemical characters using catalase activity, and Triple Sugar Iron Agar (TSIA). The data of isolate confirmed to Bergey’s Manual of Systematic Bacteriology. This research carried out on the Microbiology Laboratory, Microbiology Study Program, Yala Radjabhat University (YRU), Faculty of Science and Agriculture.

The results showed that according to physiological and biochemical characteristics in various media, the bacteria had Gram +, catalase -, coccus in shape, and were able to ferment glucose to be lactic acid. Based on the result, it is concluded that the LAB isolate shows a similar characteristic to the member of genus Lactobacillus sp. The isolated bacteria shows characteristic resistance to acidic pH and bile salts so the bacteria were fulfilled as a probiotic candidate.
Developing A Learning Continuum of Biological Resources Management Aspect from Elementary School to Senior High School Based on The Experts’ Opinions
Authors: Kusumawati M. U. , Subali B. , Paidi
Published: December 2019

This study aims to determine the experts’ opinions and the design of the learning continuum on aspects of biological resource management reviewed at the level of competence and characteristics of specific pedagogical material from elementary to high school. The method used in this research was survey by giving questionnaire to the experts. The sample of this study is convenience sample, which is 85 lecturers. This research was conducted at several State and Private Universities in the Special Region of Yogyakarta, Central Java, East Java, West Java, Jakarta. Results of this study indicate that the experts believe that the aspect of biological resource management has been taught in the tenth grade of senior high school (SHS) with cognitive levels (CL) “understanding” (C2) and “applying” (C3), and in seventh grade junior high school (JHS) with C2 CL. The design of learning continuum aspects of the management of biological resources from the FGD results based on the opinions of experts is that most of the specific pedagogical materials have begun to be taught at the JHS level with C2 CL, then continued at the SHS level with C3 CL, and there are also some specific pedagogic materials that have begun to be taught at the SHS level with C3 CL.
Clustering with spatial constraints: The case of diarrhea in Bandung city, Indonesia
Authors: Jaya I G N M , Ruchjana B N , Andriyana Y , Agata R
Published: December 2019

Clustering with spatial constraints was introduced in disease surveillance to identify high/low risk areas. These improve the geographical pattern of disease clustering. There are two types of spatial constraints, geographical distance and contiguity based. A Ward-like hierarchical clustering algorithm, including the spatial constraints, was employed on diarrheal data in Bandung city. Diarrhea is an infectious disease that causes death. The geographical distance was the best geographical dissimilarity for the diarrheal disease data. A five-cluster solution was determined to be optimal. Cluster two, which consists of three districts (Cibiru, Cinambo, Mandalajati), was considered as a high-risk cluster. It scored high on standardized incidence ratio which is caused by low on healthy house index and water quality index.
Comparing the Performance of Seasonal ARIMAX Model and Nonparametric Regression Model in Predicting Claim Reserve of Education Insurance
Authors: Ulyah S M , Mardianto M F F , Sediono
Published: December 2019

One of the biggest problems in the continuity of one’s education is the education fee which is often unaffordable. Therefore, the existence of education insurance is a solution to this problem. Along with increasing public interest in education insurance, insurance companies need to adjust the claims reserves with the number of claims paid to maintain the company’s capital. Claim reserves are funds that must be provided by insurance companies to fulfil obligations to policy holders in the future. Losses and inaccuracies in the payment of insurance claims will result in the policy holder and the insurance company itself. Therefore, it is necessary to do a prediction of insurance company’s monthly reserve claims. In education insurance, the claim reserve data has seasonal characteristics and the number of educational insurance claims tends to increase at the turn of the school year. These fluctuating patterns are supposed to fit the application of the SARIMA model and the nonparametric regression model with the Fourier series estimator in forecasting. Fourier series is a function that has flexibility in approaching fluctuating, seasonal, and recurring data patterns. The results showed that the prediction accuracy of the SARIMAX model was higher than the nonparametric regression model with MAPE of 15% and 4% respectively.
The Effect of Problem Based Learning on Mathematical Critical Thinking Skills of Junior High School Students
Authors: Yolanda Fitriana
Published: December 2019

This research aims to know the effect of problem based learning on mathematical critical thinking skills of junior high school students. This research is a quasi-experimental study with a non-equivalent control group design. This research was carried out in class VIII in one of the junior high school in Bandung, West Java Province, academic year 2014/2015 on relations and functions. Determination of the sample was conducted with purposive sampling and two classes were selected as the research sample, namely class VIII.C as the experimental class that received problem based learning and class VIII.F as the control class that received learning with the scientific approach. The results showed that the average post-test for problem based learning was 42.16 and the average posttest of the learning class with a scientific approach was 35.27. Then after being analyzed using the t-test obtained a significance value of 0.024 < 0.05. It can be concluded that there is an effect of problem based learning on mathematical critical thinking skills of junior high school students.
Analysis of The Difficulty of VIIIth Grade Junior High School Students in Circle Material Reviewed from The Mathematics Connection Ability
Authors: Kusuma Wijayanti Indra , Maman Abadi Agus
Published: December 2019

This study aims to analyze the difficulty of VIIIth grade junior high school students in circle material reviewed from mathematical connection ability. The method used in this research is descriptive qualitative with a case study approach. The subjects in this study were 23 eight grade in one of the junior high schools in Temanggung. Data collection is done by tests and interviews. The instrument used in this study are 3 questions about the material related to the Circle and interview guide to know where the students’ difficulties are. The results of data analysis showed students varied mathematical connection skills; some students belong to the high category while others are in the medium or low category. However, student’s ability to connect inter-mathematical concepts and apply mathematical concepts in solving daily problems are in the low category with 43.47% and 53.26%. The low mathematical connection ability of students is indicated by the low percentage of students who give correct answers, the low percentage on each indicator of mathematical connections, and errors made by students. Mistakes made by students show the difficulties experienced by students. The difficulty that is generally expressed by students is the difficulty of understanding the problem and the difficulty of determining the formula or theorem used to solve the problem.
Students metacognitive skill in learning mathematics through cooperative based emotional intelligence
Authors: Ilyas M , Ma’rufi  , Basir F
Published: December 2019

This type of research is quasi-experimental research which aims to determine whether mathematics learning through cooperative based emotional intelligence can improve the metacognitive skills of students Class X MIA SMAN 4 Palopo. The experimental design was one group pretest-posttest design. The population in this study were all class X SMAN 4 Palopo whose samples were determined using purposive sampling technique. The instrument of this study used a test of metacognitive skills and emotional intelligence questionnaire which were then analyzed with descriptive statistics and inferential statistics. The results of this study indicate that the average of students’ metacognitive skills is 85.67 and the results of hypothesis testing indicate that there is an increase of students’ metacognitive skills in learning mathematics through cooperative based emotional intelligence.
How Students Build Their Mathematical Dispositions towards Solving Contextual and Abstract Mathematics Problems
Authors: Sa’diyah Mukhtamilatus , Sa’dijah Cholis , Sisworo  , Handayani UcikFitri
Published: December 2019

Mathematical dispositions affect students’ performance when studying mathematics. Teachers should have high awareness of students’ mathematical dispositions when solving mathematical problems. This research identifies students’ viewpoints about problems in mathematics. Understanding students’ viewpoints would assist teachers to elevate students’ mathematical dispositions by developing more efficient test items. This is a case study research using qualitative method, of which students who have high motivation in learning mathematics were asked to answer questions related to their mathematical dispositions. Three main focuses observed on this research were students’ perceptions, attitudes, and efforts. The data show that the students build their mathematical dispositions through some process. Although they have mathematical dispositions, their preference in mathematics problems is different. Most of the students prefer solving abstract problem while others prefer solving contextual problems. This difference affected their performance in solving mathematics problems. This means that teachers should pay more attention to the form and level of problems given to the students, so that students would have less effort to understand the problems and emphasize their works by thinking more deeply when solving problems.
The characteristics of final mathematics test items based on classical test theory
Authors: Panjaitan A T , Retnawati H
Published: December 2019

Final Examination is the part of an evaluation that exists in school to assess student’s knowledge. This research aimed to show the characteristic of the final mathematics test in Junior High school, grade 8. This research was an explorative descriptive using a quantitative approach. Data collection was gathered using the documentation of mathematics’ test in Binjai, North Sumatera including student’s answers. The characteristics of test items were analyzed by expert judgment using the classical test theory approach. The average of content analysis was 0.81, there were three items without key answers so it can not be analyzed. The reliability average was 0.84 which has very good quality and difficulty index indicated the difficulty level of questions was on three categories (easy, moderate, and difficult). The difficulty is in the cartesian position, the relation of two sets, determining gradient, determining the solution of linear equation systems of two variables.
Open and low consumption platform for analysis of distributed data
Authors: Bolaño-Gonzalez J Y , Serna-Lopez G A
Published: December 2019

Parallel programming is a computing model in which the computations are run on multiple processors simultaneously. In this work, a parallel computing system is implemented through the network connection of a set of Raspberry Pi Cluster 3 boards, using 4 nodes (one master and three slaves) that acts as a single computer with improved processing speed. A Linux based operating system, Raspbian is used in the present work, our purpose is to provide an economical, scalable, powerful, mobile architecture and especially low energy consumption as an alternative to the use of high performance computing to execute Python code distributed from the Jupyter notebook platform. The main contribution of this work is the configuration of the cluster to be able to execute some learning machines.
Development of an interactive tool for soft skills enhancement in people with mild cognitive disabilities
Authors: Viana-Rúa N E , Arenas-Becerra L Y , Patiño-Murillo J A
Published: December 2019

Audio-visual tools make learning and retention of knowledge much more practical and dynamic, both for people with special educational needs and for most of the student population, because human beings tend to be more receptive to visual and auditory references about any subject. For this reason, this research proposed the development of a digital booklet to strengthen the soft skills of people with mild cognitive disabilities since these persons have more significant adaptive difficulties limiting their interaction in different activities and environments. At first, a documentary search allowed the delimitation of the problematic area in general. After the selection of the target population, different techniques and instruments were applied to know in detail the real conditions and learning needs of the selected sample. The obtained information led to the characterization of the population under study and the classification of their learning needs. The analysis delivered the design and structural requirements of the booklet, in the form of partial results leading to the next research stage to develop the prototype of the primer.
Photogrammetry for the reconstruction of realistic visual landscapes that serve for the creation of scenographies in audiovisual and multimedia products
Authors: Silva-Bolíva J , Silva-Bolívar G J , Cataño-Ospina A M , Arenas-Becerra L Y
Published: December 2019

Photogrammetry is a technique that allows the construction of hyperrealistic 3D objects. Currently, its use in the audiovisual industry has become an option to lower production budgets that are linked to art and equipment displacement, but the greatest opportunity is the creation of scenographies that simulate realistic and geolocalized visual landscapes, to starting from thinking about the details that make a space have determining characteristics and structures. Community intervention shapes a place to give it a unique look. In that case, the use of photogrammetry transcends the fact of creating places to recreate them from a city, a place or a time, based on the characteristics of the site. Recognizing this, an analysis and search of the elements that characterize Medellin, Colombia and that are necessary for the construction of a digital scenography has begun. Thus, the objective of this article is to describe the analysis that subsequently led to the theoretical construction of the visual landscape and its elevation in photogrammetry. Among the most relevant results of this research is the creation of a methodology for taking photogrammetry for the creation of scenery.
Macroscopic pest detection system for aromatic herbs in post-harvest stage using computer vision and neural networks techniques
Authors: Lenis-Martinez L , Ossa-Montoya A , Villar-Vega H F
Published: December 2019

Worldwide consumption of aromatic herbs has increased in recent years, which has led to an increase in the areas of cultivation and exports of these plants in producing countries. Within the production chain of these herbs, phytosanitary control is a requirement for the quality assurance and exports of the product. Pests cause damage in the plants, not only in the crop but also after the harvest. According to the regulatory authorities, who conduct inspections for pests, bad phytosanitary practices lead to the return of the product from the port to its origin or destruction in the country of destination. This results in an economic loss to the producer and exporter of the plant. One of the aromatic herbs with the highest level of production and export in Colombian market is thyme (Thymus). This work presents a support system for detecting macroscopic pests in thyme using computer vision techniques and neural networks. The main contribution of this work focuses on product classification between free and not free for pest in the postharvest process.
Computer forensic analysis protocols review focused on digital evidence recovery in hard disks devices
Authors: Villar-Vega H F , Perez-Lopez L F , Moreno-Sanchez J
Published: December 2019

Fourth Industrial Revolution includes cybersecurity as a key technology, given the increase in the number of devices connected to the Internet, the volume of relevant information available and the incidence of cybercrime on them. Among the lines of study of cybersecurity appears the computer forensic analysis, which seeks to reveal and analyze information in systems based on an analysis of digital evidence. This process involves a series of phases that ensure the integrity of the sources of information from beginning to end. Occupational studies in the area show a deficit of qualified and qualified personnel to cover the demand of processes related to this topic. In order to close this gap, the National Learning Service at Services and Business Management Center implements the Digital Forensic Laboratory. In this paper, workflows of computer forensic analysis procedures described in scientific documents are analyzed and a proposal of a protocol applicable to the laboratory is presented, which allows to rescue digital evidences of hard disks. A six-step procedure is proposed, ranging from the diagnosis of the case, to the presentation of results, through the collection of evidence, the copies of files, the analysis of data and the extraction of information.
Electromagnetic field and numerical analysis in two dimensions and its interaction in biological tissue
Authors: Mesa F , Ospina R , Correa G
Published: December 2019

This paper consists in transferring Maxwell’s differential equations to a discrete spatial and temporal formulation that allows coding them and implementing them in an algorithm that provides a numerical solution which provides a visual overview of the physical behavior of electromagnetic waves for two dimensions. This technique provides a tool capable of being applied to various disciplines of science with which it is possible to study systems and quantify the phenomena produced by electromagnetic activity successfully.
System for supporting and fixing body segment for nukawa lower limb rehabilitation device
Authors: Páramo-Velásquez C A , Pérez-Areiza V Z , Betancur-Betancur M J , Valencia-Legarda F
Published: December 2019

The objective of this study was the design of a system of supports and fixations for the Nukawa, an exoskeletal system of lower limb rehabilitation controlled through robotics and surface electromyography. The supporting system was developed emphasizing lumbar support, hand support, and fixation mode, grip, and suspension, in order to generate ideal ergonomic conditions for the use of Nukawa by the average population. In this context, this work developed a design proposal linking the exoskeleton with a modular orthosis type system, based on the study of body shapes and segments (cineanthropometry). The elaboration of the parts and the functional verification of the prototype considered design requirements of the Nukawa and recommendations from medical staff. Design stages also involved the specifications of the additive manufacturing, and the analysis through finite element software. The generated prototype is an intuitive system, where all the components interact to execute the rehabilitation process, with the least possible risk for the patient.
Variation of the rutile and anatase phase using a high energy planetary mill in a carbon dioxide atmosphere
Authors: Jaimes-Ochoa C J , Quintero-Orozco J H , Ospina-Ospina R
Published: December 2019

Nowadays, the ball milling technique has become one of the most important owing to its ease of getting the combination of different materials in a short time thus obtaining nanostructures of different types. In the present work, the temporal evolution of the phase change of titanium dioxide from anatase to rutile is shown through the ball milling technique. The milling time was varied from 1 to 9 hours at a carbon dioxide atmosphere controlled at a pressure of 34.47 KPa and a ratio of 1:10 (gram of material: gram of balls). The results were analyzed through X-ray photoelectronic spectroscopy. A change from anatase to rutile of the titanium dioxide structure is shown for each range of the milling time. In the same way, through scanning electron microscopy, a 90% reduction in the initial size was shown, thus, getting nanostructures of approximately 20 nm.