bluuebunny/crossref_metadata_2025 huggingface dataset:
Active sites and mechanism of the direct conversion of methane and carbon dioxide to acetic acid over the zinc-modified H-ZSM-5 zeolite
Authors: Zhang Peng , Yang Xuejing , Hou Xiuli , Mi Jianli , Yuan Zhizhong , Huang Jun , Stampfl Catherine
Published: October 2019

The catalytic activity of the conversion of CH4and CO2on zinc modified H-ZSM-5 is strongly dependent on the structure of the active sites.
Tuning the reaction pathways of phenanthroline-Schiff bases: routes to novel phenanthroline ligands
Authors: Ahmed Muhib , Rooney Denise , McCann Malachy , Casey Jamie , O'Shea Katie , Twamley Brendan
Published: October 2019

An unusual synthesis of a novel class of tetracyclic diimine ligand and its complexation to rhenium(i) is reported.
Oxidation of secondary alcohols using solid-supported hypervalent iodine catalysts
Authors: Ballaschk Frederic , Kirsch Stefan F.
Published: October 2019

Solid-supported catalysts for the oxidation of secondary alcohols are disclosed, featuring metal-free conditions, low catalyst loadings and easy reusability.
Design, complexing and catalytic properties of phosphorus thiazoles and benzothiazoles: a concise overview
Authors: Majoral Jean-Pierre , Zablocka Maria , Koprowski Marek , Hameau Aurelien , Shi Xiangyang , Mignani Serge , Caminade Anne-Marie
Published: October 2019

Playing with the versatile reactivity of thiazole and phosphorus derivatives leads to active ligands and complexes in catalysis.
Copper(ii) accelerated azide–alkyne cycloaddition reaction using mercaptopyridine-based triazole ligands
Authors: Gonzalez-Silva Karen , Rendon-Nava David , Alvarez-Hernández Alejandro , Mendoza-Espinosa Daniel
Published: October 2019

We report the synthesis, characterization and catalytic performance of a series of copper(ii) complexes supported by mercaptopyridine based traizole ligands.
Anomalous variable-temperature photoluminescence of CsPbBr3 perovskite quantum dots embedded into an organic solid
Authors: Tang Fei , Su Zhicheng , Ye Honggang , Zhu Ye , Dai Jiyan , Xu Shijie
Published: October 2019

All-inorganic lead halide perovskite quantum dots (PQDs) of CsPbBr3 were synthesized at room temperature via a facile solution-based procedure. Anomalous variable-temperature photoluminescence of the PQDs embedded into an organic solid was observed.
Haloperoxidases as catalysts in organic synthesis
Authors: Höfler Georg T. , But Andrada , Hollmann Frank
Published: October 2019

The current state-of-the-art of haloperoxidase catalysis in organic synthesis for halogenation reactions is presented in this review.
Non-solvating, side-chain polymer electrolytes as lithium single-ion conductors: synthesis and ion transport characterization
Authors: Liu Jiacheng , Pickett Phillip D. , Park Bumjun , Upadhyay Sunil P. , Orski Sara V. , Schaefer Jennifer L.
Published: October 2019

Non-solvating, side-chain polymer electrolytes with more dissociable pendent anion chemistries exhibit a dielectric relaxation dominated lithium ion transport mechanism.
Morphological analysis of chiral rod clusters from a coarse-grained single-site chiral potential
Authors: Sutherland B. J. , Olesen S. W. , Kusumaatmaja H. , Morgan J. W. R. , Wales D. J.
Published: October 2019

We present a compuationally efficient single-site potential for modelling chiral particles.
Inverse design of self-assembling colloidal crystals with omnidirectional photonic bandgaps
Authors: Ma Yutao , Ferguson Andrew L.
Published: October 2019

We demonstrate an inverse design strategy to engineer anisotropic patchy colloids to self-assemble into colloidal lattices with omnidirectional photonic bandgaps.
An ultrathinin situsilicification layer developed by an electrostatic attraction force strategy for ultrahigh-performance oil–water emulsion separation
Authors: Zhang Lei , Lin Yuqing , Wu Haochen , Cheng Liang , Sun Yuchen , Yasui Tomoki , Yang Zhe , Wang Shengyao , Yoshioka Tomohisa , Matsuyama Hideto
Published: October 2019

Development of SiO2-d-PK membraneviaelectrostatic attraction forced strategy for oil–water emulsions separation.
Controlled building of mesoporous MoS2@MoO2-doped magnetic carbon sheets for superior potassium ion storage
Authors: Liu Yuting , Xiao Yaoyao , Liu Fusheng , Han Pinyu , Qin Guohui
Published: October 2019

The synergistic effects of morphology, composition and structure endow the MoS2@MoO2@Fe@CN heterojunction exceptional potassium storage performance.
Gas sensing with heterostructures based on two-dimensional nanostructured materials: a review
Authors: Bag Atanu , Lee Nae-Eung
Published: October 2019

Advancement, challenges, and prospects in 2D–nD (where n is 0, 1, 2 or 3) heterostructures for gas sensing applications.
Assembling semiconductor quantum dots in hierarchical photonic cellulose nanocrystal films: circularly polarized luminescent nanomaterials as optical coding labels
Authors: Xu Mingcong , Ma Chunhui , Zhou Jin , Liu Yushan , Wu Xueyun , Luo Sha , Li Wei , Yu Haipeng , Wang Yonggui , Chen Zhijun , Li Jian , Liu Shouxin
Published: October 2019

Exploring semiconductor quantum dots (QDs) with circularly polarized luminescence (CPL) is desirable to design optoelectronic devices owing to the easily tunable emission wavelengths and photophysical stability.
A multifunctional and highly stretchable electronic device based on silver nanowire/wrap yarn composite for a wearable strain sensor and heater
Authors: Zhao Min , Li Dawei , Huang Jieyu , Wang Di , Mensah Alfred , Wei Qufu
Published: October 2019

Stretchable and wearable electronics, as a well-researched engineering frontier, can be applied in human motion detection, thermal therapy, personal healthcare monitoring and smart human–machine interactions.
Long-term Outcomes Following Lumbar Microendoscopic Diskectomy and Microendoscopic Decompression: Minimum 10-year Follow-up Evaluation Performed Using a Patient-based Outcome Measure
Authors: Aihara Takato , Endo Kenji , Suzuki Hidekazu , Sawaji Yasunobu , Urushibara Makoto , Matsuoka Yuji , Takamatsu Taichiro , Murata Kazuma , Kusakabe Takuya , Maekawa Asato , Ouchi Juntaro
Published: October 2019

Study Design Retrospective study of prospectively collected outcome data.

Background No studies have evaluated the long-term outcomes following microendoscopic diskectomy for lumbar disk herniation (MEDH) and microendoscopic decompression for lumbar spinal stenosis (MEDS) using the Japanese Orthopaedic Association Back Pain Evaluation Questionnaire (JOABPEQ).

Objective To assess the minimum 10-year outcomes following MEDH and MEDS.

Patients and Methods Seventy-six patients were classified into three groups: disk herniation (DH) group (33 patients underwent MEDH); spinal stenosis (SS) group (23 patients underwent MEDS); and degenerative spondylolisthesis (DS) group (20 DS patients underwent MEDS). The follow-up rate was 50.3% (76/151). The results were statistically compared using Scheffé's F test for differences among the DH, SS, and DS groups. The paired t test was used to compare the preoperative and postoperative visual analog scale (VAS) scores. The degrees of improvement (DOIs) on JOABPEQ and the intensities of improvement (IOIs) on VAS at the first follow-up evaluation (FFE) (mean: 12 months after the operation) and at the most recent follow-up evaluation (MRFE) (mean: 126 months) of the DH group were statistically compared by the paired t test. DOIs and IOIs at MRFE of the SS group (mean: 126 months) and DS group (mean: 125 months) were statistically compared by the unpaired t test. A p value < 0.05 was considered statistically significant.

Results Statistical comparisons of the DOIs in all five functional scores and IOIs in low back pain (LBP), leg pain, and leg numbness showed no significant differences among the DH, SS, and DS groups. The effectiveness rates of pain-related disorders, gait disturbance, and social life disturbance in JOABPEQ were almost equally high in all three groups. Significant decreases in LBP, leg pain, and numbness, as measured with VAS, were noted at MRFE in all three groups. No significant differences were observed between FFE and MRFE concerning the DOIs and IOIs of the DH group, and between the SS and DS groups concerning the DOIs and IOIs at MRFE.

Conclusion Clinical 1-year outcomes of MEDH were thought to be maintained for  > 10 years, and MEDS leads to the same clinical long-term outcomes with DS as without DS. Moreover, MEDH and MEDS were almost equally effective for  > 10 years not only in improving LBP, leg pain, and numbness but also especially in improving pain-related disorders, gait disturbance, and social life disturbance by detailed quality-of-life assessment using JOABPEQ.
Pancreatic Incidentalomas: Review and Current Management Recommendations
Authors: Sureka Binit , Varshney Vaibhav
Published: October 2019

There has been significant increase in the detection of incidental pancreatic lesions due to widespread use of cross-sectional imaging like computed tomography and magnetic resonance imaging supplemented with improvements in imaging resolution. Hence, accurate diagnosis (benign, borderline, or malignant lesion) and adequate follow-up is advised for these incidentally detected pancreatic lesions. In this article, we would review the various pancreatic parenchymal (cystic or solid) and ductal lesions (congenital or pathological), discuss the algorithmic approach in management of incidental pancreatic lesions, and highlight the key imaging features for accurate diagnosis.
Extradural Transjugular Transsigmoid Approach with High Cervical Exposure for Glomus Jugulare Tumor
Authors: Matsushima Ken , Kohno Michihiro , Hashimoto Takao , Izawa Hitoshi , Tanaka Yujiro , Inagaki Taro
Published: October 2019

Surgical removal of glomus jugulare tumors is challenging owing to the complex anatomy of the temporal bone and craniocervical region, aggressive tumor invasion into the nearby structures, and their hypervascularity. However, recent advances in skull base techniques, intraoperative neuromonitoring, and radiological interventions have enabled their relatively safe resection, while giving priority to functional preservation. This video demonstrates a case of a glomus jugulare tumor treated by the extradural transjugular transsigmoid approach with high-cervical exposure and tympamoplasty, after preoperative embolization. A 47-year-old woman presented with progressive hearing disturbance, pulsatile tinnitus, and hemifacial spasm. Neuroimaging displayed a hypervascular tumor occupying the temporal bone, extending to the cervical region through the jugular foramen, and to the external auditory canal. Preoperative feeder occlusion was successfully performed without any additional symptoms, while carefully evaluating the provocative test. Near-total resection of the tumor was achieved through the transjugular transsigmoid approach with high-cervical exposure under detailed neuromonitoring, including continuous facial nerve monitoring and auditory brainstem response. In this patient, in whom the tumor did not invade intradurally and the sigmoid sinus was already occluded preoperatively, the sinus was managed only by coagulation, to avoid unnecessary dural opening and the risk of cerebrospinal fluid leakage. Anterior facial nerve rerouting was not required since the tumor removal was accomplished through the corridor above and below the fallopian bridge. The patient had no new neurological deficits, and her pulsatile tinnitus and hemifacial spasm disappeared after the surgery. Her hearing disturbance improved postoperatively.

The link to the video can be found at: https://youtu.be/gqf3dxHlv_0.
Euthanasia: Ethical Challenges of Shift from “Right to Die” to “Objective Decision”
Authors: Minocha Vivek R. , Mishra Arima
Published: October 2019

Euthanasia is mercy killing to alleviate the pain and misery of moribund persons. The thought in this regard is “Right to Life” includes “Right to Die.” This paper examines the issue of euthanasia in advanced stage of terminal cases with no possibility of reversal and it has been argued that there is a case for lifting euthanasia from the domain of human rights “Right to Die,” bringing the issue as a matter for professional opinion, a kind of medical advice/prescription. Guidelines need to be framed and criteria are laid down and notified under which euthanasia can be recommended. The decision is taken whether or not the criteria laid down are fulfilled in an objective manner. Like for other medical interventions “informed consent” is essential. In consideration of safeguards the decision is entrusted to a medical board and is subject to a legal prescrutiny. Professionally prescribed decision will to a great extent reduce emotive response surrounding euthanasia. The family may not have to face a difficult dilemma in deciding about euthanasia. There may not be a necessity of “living will,” although it may still be useful. The change to treat euthanasia as a professional decision/medical advice will require making legal and administrative provisions to empower medical establishment to discharge responsibility of euthanasia. It is essential to legalize euthanasia with corresponding modifications of medical ethics and code of conduct prescribed by Medical Council of India, State Medical Councils, and other regulatory bodies. It is essential to identify the procedure for carrying out euthanasia and the personnel assigned to actually carry out. Injection of lethal substance in lethal dose may be a favored choice. Once final decision after legal prescrutiny is arrived for euthanasia, differentiating passive and active euthanasia is unnecessary. In one perspective, active euthanasia is less disturbing for the patient, family, and friends as withdrawal of supporting tubes leading to dehydration, wasting, and struggling for breath associated with passive euthanasia, which nullifies the basic tenet of euthanasia, can be avoided. There is a possibility of spill over benefit of “active euthanasia” in the form of opportunity to promote cadaveric organ transplantation. Caution has to be exercised for effective safeguards to prevent misuse. There is a case for consideration for brining decision-making process regarding euthanasia within medical professional assessment and implementation.
Analysis and control of heating of magnetic nanoparticles by adding a static magnetic field to an alternating magnetic field
Authors: Sebastian Armando Ramos , Kim Hyung Joon , Kim Sung Hoon
Published: October 2019

In this paper, we analyzed the influence of a static magnetic field (SMF), generated by a pair of neodymium magnets, on the temperature rise and the specific absorption rate (SAR) of superparamagnetic nanoparticles when exposed to an alternating magnetic field (AMF). Furthermore, we attempted to verify the feasibility of controlling the SAR and steady state temperature increase of the magnetic nanoparticles (MNP) by controlling the magnitude of the applied SMF. Magnetic heating was produced by applying a high-frequency AMF generated by a solenoid coil and an SMF generated by using a pair of magnets; the SMF value could be controlled by varying the separation distance between the magnets. We performed two sets of experiments: in the first, heating was performed using different amplitudes of AMF and SMF. The results showed that while the increase in temperature and SAR was maximum in the absence of an SMF, these values decreased with increasing SMF value, tending to zero as the nanoparticles approached their magnetic saturation state. In the second set of experiments, we used the curve fitting of the experimental data to obtain the required SMF value to achieve two different specific temperatures and SAR values. The measured values of temperature rise and SAR were quite similar to those calculated using the curve-fitted data. Thus, the experimental results confirm the possibility of controlling the heating properties of MNP during magnetic hyperthermia through an applied SMF.
Nonlinear interaction of whistler waves in a magnetized plasma with density ducts
Authors: Zaboronkova T. M. , Krafft C. , Yashina N. F.
Published: October 2019

The nonlinear resonant interactions between whistler waves guided by density ducts surrounded by a uniform magnetized plasma are studied. It is shown that, under specific conditions that are determined, a time-harmonic external electromagnetic field can drive the parametric instability of guided whistlers. Both cases of cylindrical and planar ducts are considered, of either decreased or increased plasma density. The frequency interval where the magnetized plasma may be resonant is analyzed. The growth rate and the threshold of the parametric instability are determined. Numerical calculations are presented for parameters typical of “space plasmas and” modeling laboratory experiments where guided whistler propagation was observed.
Film transfer of structured organo-lead-halide perovskite for low-cost lasing applications
Authors: Leyden Matthew R. , Matsushima Toshinori , Bencheikh Fatima , Adachi Chihaya
Published: October 2019

Organo-lead-halide perovskite materials offer a potentially low-cost way to fabricate high-quality optoelectronic devices such as solar cells, light-emitting diodes, and lasers. In this work, we focused on perovskite laser applications. There are many types of perovskite lasers reported such as photonic crystal lasers and distributed feedback lasers. These lasers typically require nanoscale lithography to produce the needed cavity structure, which adds significant complexity and cost. This additional cost is not compatible with a vision of low-cost solution processed lasing films. Within this report, we demonstrate a way of replicating grating patterns in lasing films on low-cost polyethylene terephthalate substrates. The film is formed on the master grating and transferred to the final substrate. The master grating can then be used repeatedly. In this process, there is no need to repeat the lithography process and it does not require an additional material, like a UV-cured resin, to create the laser cavity. The cavity is made from the perovskite material itself. Additionally, the film formation is largely independent of the final substrate, eliminating concerns about solvent-substrate compatibility.
Similarity-transformed equation-of-motion coupled-cluster singles and doubles method with spin-orbit effects for excited states
Authors: Bokhan Denis , Trubnikov Dmitrii N. , Perera Ajith , Bartlett Rodney J.
Published: October 2019

The similarity transformed equation-of-motion coupled-cluster method (STEOM-CCSD) for excited states is extended to treat spin-orbit coupling interactions (SOIs) using the spin-orbit mean field approximation of the Breit-Pauli Hamiltonian. Two possible schemes to include the spin-orbit splittings of excited states within the STEOM-CCSD model are formulated. They are identified as “diagonalize-then-perturb” and “perturb-then-diagonalize” approaches. The second approach is more suited for cases where SOI is larger, and the first approach breaks down. With the aid of the standard many-body diagrammatic techniques, expressions for all the necessary matrix elements can be derived. These new formulations are implemented in the ACES III suite of parallel coupled cluster programs, and benchmark studies are performed. Numerical tests for several atoms and molecules show a good agreement of calculated spin-orbit splittings to experiment, while also documenting the numerical differences between the two approaches.
New research integrates silicon photonics with silicon carbide
Authors: Gasparini Allison
Published: October 2019

Researchers create an on-chip photonic device using silicon photonics and silicon carbide.
Case-controlled study of skin conditions in HIV-negative men who have sex with men
Authors: Stewart Thomas J. , Wallace Lynnette
Published: October 2019

Most of the dermatological research in men who have sex with men (MSM) has been in the HIV-infected subpopulation. A retrospective case-control study was performed of dermatologic diagnoses in HIV-negative MSM (n = 329) compared with male heterosexual controls (n = 600). HIV-negative MSM had a higher frequency of folliculitis (19/329 vs 12/600; P = 0.004), cutaneous herpes simplex infection (19/329 vs 14/600; P = 0.009), non-melanoma skin cancer (16/329 vs 10/600; P = 0.006) and syphilis (8/329 vs 2/600; P = 0.005) than the control group. The findings suggest that HIV-negative MSM may have a higher burden of certain skin conditions and this appears to be independent of immunosuppression or sexual behaviours.
Effects of caffeine on inspiratory muscle function
Authors: Nicks Clayton R. , Martin Ellen H.
Published: October 2019

Research suggests that caffeine can enhance measures of muscular strength in the upper and lower extremities, although the literature is somewhat equivocal. Little is known on whether or not caffeine will improve maximal inspiratory pressure (MIP), a surrogate measure of inspiratory muscle strength. The purpose of the study was to determine the effects of a moderate dose of caffeine on inspiratory muscle function. Fifteen (8 male, 7 female) healthy adults (mean ± SD: age = 24.3 ± 6.4 years; height = 1.75 ± 0.11 m; body mass = 78.8 ± 16.5 kg) volunteered to participate in the study which used a double‐blind, placebo‐controlled, cross‐over design. During the initial visit, baseline data was collected and participants were familiarized with inspiratory muscle measurements. For the second and third visits, participants ingested either a 5 mg kg−1 dose of caffeine (CAF) or placebo capsule (PL). After one hour, they completed at least 12 maximal inspiratory manoeuvres with 1 min rest between each attempt. MIP, maximal inspiratory peak pressure (PP), and maximal rate of pressure development (MRPD) were recorded. The CAF trial resulted in significantly higher MIP (154.7 ± 35.8 vs. 146.6 ± 37.6 cmH2O; p = 0.02) and PP (165.8 ± 36.8 vs. 158.3 cmH2O; p = 0.01) compared to the PL condition. No significant difference was observed in MRPD (p = 0.18). MIP and PP improved after ingestion of caffeine compared to the placebo condition. The findings from the study further establish caffeine's potential ergogenic benefit on measures of muscular strength.
Cortical tethering of mitochondria by the anchor protein Mcp5 enables uniparental inheritance
Authors: Chacko Leeba Ann , Mehta Kritika , Ananthanarayanan Vaishnavi
Published: October 2019

During sexual reproduction in eukaryotes, processes such as active degradation and dilution of paternal mitochondria ensure maternal mitochondrial inheritance. In the isogamous organism fission yeast, we employed high-resolution fluorescence microscopy to visualize mitochondrial inheritance during meiosis by differentially labeling mitochondria of the two parental cells. Remarkably, mitochondria, and thereby mitochondrial DNA from the parental cells, did not mix upon zygote formation but remained segregated at the poles by attaching to clusters of the anchor protein Mcp5 via its coiled-coil domain. We observed that this tethering of parental mitochondria to the poles results in uniparental inheritance of mitochondria, wherein two of the four spores formed subsequently contained mitochondria from one parent and the other spores contained mitochondria from the other parent. Further, the presence of dynein on an Mcp5 cluster precluded the attachment of mitochondria to the same cluster. Taken together, we reveal a distinct mechanism that achieves uniparental inheritance by segregation of parental mitochondria.
Electromagnetic strain measurements and two-directional mechanical stress estimation for a REBaCuO ring bulk reinforced by a metal ring during field-cooled magnetization
Authors: Namba Sora , Fujishiro Hiroyuki , Naito Tomoyuki , Ainslie Mark D , Huang Kai Y
Published: October 2019

In this paper, simultaneous measurements of the electromagnetic strains along both the circumferential (θ) and radial (r) directions are reported for a large single-grain EuBaCuO ring bulk reinforced by an Al alloy ring during field-cooled magnetization (FCM) from 5 T at 50 K using several strain gauges adhered to the surface. To verify the experimental results and to understand the complex stress–strain behavior, mechanical analyses were carried out using a three-dimensional finite element model that closely represents the experimental setup. The simulation results of the electromagnetic strains along both directions showed excellent qualitative and quantitative agreement with the experimental ones. These results strongly suggest that the numerical model must include the exact same structure (size, shape and materials) of the mechanical support structure as the experimental setup in order to reproduce the experimental results both qualitatively as well as quantitatively. This also explains our previous research (SuST 2019 32 015007), where the measured circumferential strains were about 50% smaller those in the numerical simulation. Furthermore, the electromagnetic stresses along both directions during the FCM process are estimated from the obtained experimental strains. As a result, the estimated stresses were fairly consistent with those obtained by the numerical simulations, suggesting that our stress–strain simulation technique is both qualitatively and quantitatively reliable and useful to clarify the possibility of mechanical fracture of bulk superconductors.
The potential effects on junior high school mathematics learning: The reading texts for learning stage of the school literacy movement
Authors: Effendi KNS , Zulkardi  , Putri RII , Yaniawati P
Published: October 2019

This study discusses the result of the field test stage of reading texts development for reading activities in School Literacy Movement in mathematics learning with futsal context. This study is development research with design research method and development studies as its type. The evaluations at the prototyping stage use the formative study with self-evaluation, expert review, one-to-one, small group, and field test as its phases. The subjects were 7th-grade students at a junior high school in Karawang. The data were collected using documentation, questionnaires, tests, and interviews. The calculation of the effect size is 2,895 and categorized as high. Based on this result, it shows that the reading texts for the learning stage of the School Literacy Movement have potential effect for students in mathematics learning.
Can Sociomathematical Norms Be Developed With Learning Media?
Authors: Adi Widodo Sri , Turmudi  , Afgani Dahlan Jarnawi
Published: October 2019

The purpose of this article shows that sociomathematical norms can be raised through learning media. Sociomathematical norms are social norms related to problem-solving in mathematics learning. Sociomathematical norms can be formed from interactions between students or teachers in learning mathematics so that the culture of mathematics can be formed in a group or the class community at school. This preliminary study is not to create learning media that can improve the norms of sociomathematical but can only utilize conceptual by comparing various literature related to social norms, sociomathematical norms, and learning media. Theoretically, using visual media can improve sociomathematical norms, so that mathematical culture in the class can be formed. This is because visual learning media can be used by students to interact with the surrounding environment. In this regard, the teacher needs to prepare visual learning media to help mathematics learning so that the mathematics culture in the class can be formed
Lingko: Interweaving Manggarai Culture, and Mathematics
Authors: Makur A P , Sutam I , Gunur B , Rampung B
Published: October 2019

This research was conducted to explore the relationship between formal mathematics andLingko, a system of traditional agricultural land distribution in Pocoleok, Manggarai-NTT Regency shaped like a spider web.Lingkowas interesting to study concerning mathematics because of the philosophical values contained inLingkoand theLingkosharing ceremony. This research focused on two things, namely: (1) how the distribution of ulayat land,Lingko, was mathematically reviewed while still paying attention to cultural values, and (2) how the community practiced mathematical concepts in the distribution ofLingko. The first focus of the problem was to uncover the mathematical activity of the distribution of ulayat land,Lingko, which was unknowingly carried out by the Pocoleok, Manggarai peoples. Knowledge gained from this first study might produce a new approach to learning mathematics, both from a mathematical or mathematical education perspective. The second focus of the problem sought to reveal the extent to which the basic concepts of Manggarai culture (following understanding) to solve mathematical problems faced in the reality of life. This second study provided more space for cultural-based mathematics learning, namely how to comprehend mathematical concepts based on contextual issues that arise in Manggarai culture.
Teachers’ belief in mathematics teaching: a case study of early childhood education teachers
Authors: Noviyanti M
Published: October 2019

This article aims to analyze teachers’ belief in mathematics teaching. Furthermore, this article will be used as a reference for a professional development program that the researcher is going to develop. This research is a case study with five respondents in a city in West Java, Indonesia. Semi-structured interviews towards five respondents were conducted using an interview guideline that refers to the instrument The Mathematical Development Beliefs Survey. The thematic analysis was used for data processing in this research. The result of the research revealed all respondents agreed that mathematics is a substantial part of early childhood education curriculum, contributes to the confidence of the students, development activities could be carried out, and early childhood is ready for mathematics. However, they are unsure and less confident in teaching mathematics and basic math knowledge. This research suggests that professional programs given should aim to boost teachers’ belief in teaching mathematics.
8th Grade Student’s Collaboration In Circle Material By Using System Lesson Study For Learning Community
Authors: Yono S , Zulkardi  , Nurjannah
Published: October 2019

This study aims to describe the collaboration of students through lesson study for learning community in circle lesson. The data is obtained through the result of the observation and documentation of photos and videos. The subject of this study is second-grade students of Junior High Scholl at 1 Palembang. This is a descriptive qualitative study with PMRI approach. The learning process is done by doing a Jumping Task where students solve the problems individually and are encouraged to ask other students when difficulties are found. The use of lesson study for learning community has brought a positive impact for second-grade students like showing up a sense of care, decreasing the rise of competitiveness and creating collaboration among students in the learning process.
PISA-like problems on students’ mathematical literacy using the context of Jakabaring sport city
Authors: Mitari O , Zulkardi Z
Published: October 2019

Challenges for developing countries must certainly have students with high mathematical literacy abilities. The fact was Indonesian students in PISA math rankings are still not good; it because of the low mathematical literacy abilities of students. This article aimed to know the potential effects of PISA mathematics problems on students mathematical literacy abilities. The method in this study used a design research type of development study with the preliminary and formative evaluation stages. The evaluation flow at the prototyping stage was a formative study including the self-evaluation stage, expert review and one-to-one, small group, and field test. In this article, the discussion of the study was about the results of students’ answers in the field test stage, questions that have potential effects that give rise to mathematical literacy abilities namely communication ability, mathematical ability, representation ability, reasoning, and argument ability, choose strategies to problem-solving ability, and use language and symbolic, formal and technical operation ability. With the dominant ability was communication ability.
Promoting students self determination theory skill in merills first principle of instruction
Authors: Wilujeng H , Kusumah Y S , Darhim D
Published: October 2019

The self determination theory is the ability that allows an individual to choose and have several choices to determine an action. The problems experienced by the students related to SDT are the decreasing motivation of students to develop themselves, students are unable to be responsible and not sensitive to the feelings of others. The purpose of this study was to examine the differences in SDT achievement of MPK student self determination theory (high, medium and low). This research method was quasi experiment with Post-test Only Control Design. Subjects in the study were 124 students. The learning process was carried out through Merrill’s First Principles of Instruction and ordinary learning. The results shows that the average achievement of high, medium and low MPK on the self determination skill theory of students who received MFPI learning are better than those who received regular learning. In SDT indicator, autonomy and students relatedness who have high MPK are superior in comparison to medium and low MPK. The low MPK category is better on competence indicators compared to high MPK and medium MPK. MFPI learning should be an alternative learning for teachers in mathematics because in addition to improving student cognitive abilities.
Teaching materials design based on project learning to improve the students’ mathematical understanding
Authors: Lukman H S , Setiani A
Published: October 2019

Project-based learning requires students to explore and combine their knowledge and skills to solve problems in groups for a certain time. Through the development of project-based teaching materials, students learn to apply theory in an activity that produces experience, so that learning is expected to be more meaningful and improve the students’ mathematical understanding. This study aimed to determine the validity, practicality, and effectiveness of teaching materials based on project learning to improve the students’ mathematical understanding, especially on the applied statistics course. The stages of this study consisted of design and development, product validation by 3 experts, limited testing of 10 students, and field testing of 97 students. The results show that the teaching material has fulfilled the valid, practical, and effective aspects used in learning because it increases the ability of students’ mathematical understanding by 15.8%.
Implementation of peer tutor learning in improving students’ mathematical understanding ability
Authors: Rosdianwinata E , Rifa’i R , Nasrullah Anton
Published: October 2019

The purpose of this study was to apply peer tutoring learning to improve students’ mathematical understanding skills. The method used in the study was a quasi-experimental method with a pre-test post-test control group design. The place of research was conducted in one of the universities in Banten. Samples were taken by two classes purposively. The research sample chosen consisted of two classes, namely 39 students in the experimental class and 38 students in the control class. The research instrument used was a test of comprehension ability. Data analysis is used in processing N-Gain results. The results of the study show that: 1) the achievement of the ability of mathematical understanding of students who study with peer tutoring learning is better than students who study conventionally; 2) improvement in students’ mathematical understanding ability in experimental class (peer tutoring) better than control class (conventional).
Development of high school student work sheets using VBA for microsoft word trigonometry materials
Authors: Bernard Martin , Sumarna Aceng , Rolina Rosalina , Akbar Padillah
Published: October 2019

The research was aimed to show that developing a learning media impacted to improve students ability in mathematical learning. The process implementated the application of VBA for microsoft word in mathematical learning. The formulation of the problem in this research are whether 1) can developing media assisted VBA for microsoft word improve mathematical ability? 2) Did Students show positive response in learning process? ADDIE was used as approach in this research. There are five stages in ADDIE approach. Population of this research was in group with 34 samples of vocational students. The instruments are cognitive test, interview and observation. Based on the results of the process, there was an increasing in mathematical ability of vocational students in trigonometry lesson through media VBA for microsoft word. The implementation of learning process through media VBA for microsoft word was success. Students enjoyed the process, active, responsive, and enthusiastic. The conclusions are the developing of media VBA for microsoft word can improve mathematical ability of vocational students before and after using media, and students showed positive response to learn by media in trigonometry.
Mathematical learning by utilizing loce, manggaraian traditional mats
Authors: Hanim M F , Makur Alberta P , Raga P , Pantaleon K V
Published: October 2019

This study discussed the exploration of mathematical concepts in Traditional Mat,Loce, as a product of Manggarai culture. This study aimed to describe the mathematical ideas contained in the Traditional Mat,Loce, Manggarai and how the linkages between the concepts found in the traditional mats,Loce, Manggarai and the topic of learning in schools. This research was qualitative research with ethnographic methods. Data collections were carried out through observation, interviews, and documentation. The subjects in this study consisted of 4 people, namely community leaders who could carry outRojok Loceactivities and the craftsmen. The results of this study indicated that there were several mathematical concepts found in the traditional mat,Loce, and had links in the topic of Mathematics learning in the school, namely the idea of fraction distribution, measurement, burial and measurement of the area of the flat building. The concept of fraction is when a craftsman mats a strand of pandanus leaves into several parts with an unequal size, the idea of measurement is still using traditional measurements ofpagatanddepawhich are used to measure the length and width of the mat, the concept of mating during the mat making process the same form unit square to produce a mat and the concept of measuring the area of flat building when the mat is finished.
Differential item function of gender in the mathematics elementary school tryout test
Authors: Ardiyaningrum M , Badriah L , Trisniawati  , Suhartini  , Widodo S A
Published: October 2019

The purpose of this paper is to describe: 1) number of items in the elementary school mathematics national examination tryout test containing DIF gender and pattern; 2) functionality of differential tests on elementary school mathematics national examination tryout test tool organized by the Pythagoras tutoring institute. This study is a quantitative explorative descriptive study with a type of case research, because it describes the characteristics of the elementary school mathematics national examination tryout tests device and is not generalizable. The amount of data used comes from the answer patterns of 919 students consisting of 431 female students and 488 male students. As for the results of this study are: 1) the elementary school mathematics national examination tryout test kit has a different power ranging from 0.282 to 1,129 and the level of grain difficulty ranges from -3,365 to 2,838; 2) Items in the elementary school mathematics national examination try out test containing 34 items or as much as 87.2%; 3) the elementary school mathematics national examination tryout test kit benefited the female group in theta > -3.06 which was seen from the DTF (differential test function) graph in the male and female groups.
Student’s mathematical skills in solving vector connection analysis
Authors: Senjayawati E , Kadarisma G , Bernard M
Published: October 2019

This research aims to learn and analyze the capability of the student’s mathematical material connection with vector analysis. The Data collected are the result of test instruments and interview result with several students. The method of this research uses descriptive qualitative method. The subject of this research is Siliwangi Teachers’ Training Students who have taken material vector analysis. Based on the Data from the analysis of the test results of the mathematical connection of the problem indicator, the first indicator percentage is Obtained items, namely finding the relationship between the various concepts of representation and procedures, then understanding the relationship between mathematical topics, the presentation is 41.25%. The second indicator of understanding the equivalent representations of the same concept, the presentation is 67.5%. The third presentation indicator, using mathematics in other fields of study or in daily life is 65%. As for the fourth indicator, use an evaluation of the relationship between mathematical topics and the mathematical topic outside is 47.5%. The results of the interviews show that students sometimes forget to use formula prerequisite concepts as material.
The effectiveness of Geogebra-assisted direct instruction learning in improving students’ mathematical communication skill viewed from academic level
Authors: Zetriuslita  , Nofriyandi  , Istikomah Endang
Published: October 2019

The aim of this study was to identify and analyze the effectiveness of utilizing Geogebra in improving students’ mathematical communication skill viewed from academic level. This study is a mixed method research which combines both quantitative and qualitative methods with sequential explanatory strategy. The population was the second semester students of Mathematics Education and used purposive sampling technique. The result of this study showed that there was effectiveness of using Geogebra in improving students’ mathematical communication skill viewed from their academic level. The students felt that their skill improved and developed through Geogebra-assisted Directed Instruction learning.
Development of innovative teaching and learning module in linear algebra course assisted by Maple
Authors: Novtiar C , Fitrianna A Y
Published: October 2019

The aim of this study is to develop an innovative teaching and learning module in Linear Algebra assisted by Maple. This study used Research and Development (R&D) with 4D (Define, Design, Development and Dissemination) model as its methodology developed by Thiagarajan, but in this study, the methodology is limited up until Development stage only. Two instruments were used in this study: expert validation sheets and students response sheets. These instruments were used to determine the validity of this module. Validity analysis on three expert validator gave draft I as the result meanwhile validity analysis on the students response gave draft II as the result. In this study we used 4 months research on 2015 Mathematics Education Department students, IKIP Siliwangi. The result of this study show that expert validity learning module is said to be valid with the results of validation from three expert validators having a value of 4.1 on a scale of 5 with very high validity of 58.82%. Limited trial for students showed a value of 3.44 on a scale of 5 with moderate validity of 63.16%.
Achievement of students mathematical resilience through problem based learning model with metacognitive approach
Authors: Hutauruk A JB , Darmayasa J B , Priatna N
Published: October 2019

This paper discusses the effect of the Problem Based Learning model with the Metacognitive approach (PBLM) on achieving students mathematical resilience. This study also discusses the interaction between learning models with mathematical prior knowledge towards mathematical resilience abilities. This research is a quantitative study, with two classes as research subjects namely the experimental class and the control class. The research instrument uses a scale of mathematical resilience, interview guidelines, and observation sheets. Research findings obtained include: (1) the learning model used does not have a significant difference to the achievement of mathematical resilience, both overall and based on the mathematical prior knowledge (MPK) (2) the achievement of mathematical resilience abilities of students who get learning with PBLM learning models is not significantly better than students who get conventional learning as a whole or based on MPK, and (3) there is no effect of interaction between the learning model used with MPK on achieving students’ mathematical resilience abilities.
Gender and mathematical abstraction on geometry
Authors: Fitriani N , Nurfauziah P
Published: October 2019

This research is conducted due to low mathematical abstraction ability of junior high school students, since that mathematical abstraction is an important skill for both male and female students so that it is considered important to study gender factors for mathematical abstraction abilities. The objective of this research is to find out whether there is a significant difference between male and female mathematical abstraction abilities after using scientific approach supported by Excel VBA. This research was conducted to 16 female students and 15 male students of 9th grade at one of the junior high schools in West Bandung, Indonesia. The method in this study is quasi experimental by comparing the abstraction abilities of male and female students after being through by scientific approach assisted by Excel VBA. The instrument of this research is 3 questions about mathematical abstraction questions. The results of this study indicate that there are significant differences in mathematical abstraction between male and female students for some indicators after using the Scientific approach assisted by VBA Excel, this means the Scientific approach which assisted by Excel VBA can show the differences of mathematical abstraction between male and female students.
Optimal control for the use of botanical fungicides in the spread of plant diseases
Authors: Amelia R , Mardiyah M , Nahar J , Anggriani N , Supriatna A K
Published: October 2019

One of the main obstacles in crop cultivation is the occurrence of fungal infections. Fungal spores can spread due to direct contact between susceptible hosts and infected hosts, which can be controlled using botanical fungicides. We constructed a mathematical model of the growth of logistics on the spread of plant diseases. From this model, we show the value of the Basic Reproduction Number (ℜ0) of plant diseases transmission. The value of ℜ0 is obtained by finding the largest eigenvalue of the next generation matrix. The results obtained show that when ℜ0 is greater than one (ℜ0 > 1), the endemic equilibrium point will be stable. However, if ℜ0 is less than one (ℜ0 < 1), the endemic equilibrium point is unstable. In addition, the results of this discussion indicate that using botanical fungicides can reduce the infected host population. We provide numerical simulations to describe the results of the analysis obtained.