bluuebunny/crossref_metadata_2025 huggingface dataset:
Performance Evaluation of System in Free Space Optic Utilizing Gaussian Optical Filter in Different Detection Scheme
Authors: Djellab H. , Bouarfa A. , Bojanic S.
Published: April 2019

In recent years, free space optical communication (FSO) has become a leader for its unique characteristics: large bandwidth, unlicensed spectrum, simple implementation, low power and high data rate. However, we use as a transmission medium for Spectral Amplitude Coding-Optical Code Division Multiple Access SAC OCDMA system. In this paper, we investigate the optimum received power of FSO communication system employing SAC OCDMA, by using different detection technique, such us Spectral Direct Detection SDD and Single Photodiode Detection (SPD) technique under optical Gaussian filter decoder schemes with Modified Double Weight code (MDW). In this work, the adverse effects of atmospheric channel limit the possibility of a large FSO communication, moderate turbulence and hazy weather conditions are considered. The results show that the performance of the proposed system with wavelength-division-multiplexing (WDM) multiplexer (MUX) based on Gaussian optical filter with SDP detection fares better than the system employing SDD technique.
High-Speed Light Sources in High-Speed Optical Passive Local Area Communication Networks
Authors: Amiri IS , Rashed Ahmed Nabih Zaki , Yupapin P
Published: April 2019

This study outlines the high-speed light sources in high-speed passive optical local area communication networks. Directly modulated laser measured is selected as a light source for data rate transfer of 40 Gb/s for propagation range up to 20 km. Optical output power after fiber-optic cable is measured. Signal power amplitude, Q-factor, and data error rates after the receive side are also measured. Hybrid optical amplifier, optical filters, and electrical filters are used for upgrading the network performance operation efficiency. The study assured that the optical communication network can be extended to 20 km distance with data rates of 40 Gb/s with achieving maximum Q-factor of 14.98 and minimum data rates of 3.55 ×10–51.
Effect of metformin on clinical and biochemical hyperandrogenism in adolescent girls with type 1 diabetes
Authors: Hafez Mona , Musa Noha , Elbehairy Shaimaa , Atty Sahar Abdel , Elbarbary Menna , Amin Maha
Published: April 2019

Background

Hyperandrogenism with or without polycystic ovarian syndrome is seen in adolescents with type 1 diabetes (T1D), especially those with suboptimal control.

Objective

To assess the effect of metformin on hyperandrogenism and ovarian function in adolescents with T1D.

Methods

This prospective study included 28 T1D females showing signs of hyperandrogenism. History taking (detailed diabetes history and menstrual history) and anthropometric measurements (weight, height, body mass index [BMI], waist and hip circumference) were initially performed, and then the patients were assessed for the manifestations of hyperandrogenism (acne, hirsutism as well as pelvic ultrasound [U/S] for ovarian morphology). Biochemical evaluation for ovulation (progesterone assessment during the luteal phase), sex steroids (estradiol, testosterone, dehydroepiandrosterone sulfate [DHEAS] and androstenedione), prolactin, glycemic control (hemoglobin A1c[HbA1c]) and gonadotropin levels (follicle stimulating hormone [FSH] and luteinizing hormone [LH]) was done. Patients were subjected to 500 mg metformin twice daily orally for 1 year, and then the patients were re-evaluated for clinical and biochemical parameters.

Results

Metformin therapy resulted in a significant reduction in weight (p = 0.001), BMI (p = 0.002), acne (p = 0.008), hirsutism score (0.007), LH (p = 0.008), testosterone (p < 0.001) and androstenedione levels (p = 0.028) in adolescent girls with T1D. Regarding menstrual irregularities, there was a significant reduction in the number of patients with oligomenorrhea (68%) with a p value of <0.001. However, there were no significant reduction in the daily insulin requirements (p = 0.782) or HbA1c(p = 0.068). Nausea and/or abdominal pain were the commonly reported side effects of metformin (64%).

Conclusions

Metformin as an insulin sensitizing agent improved the BMI and cycle regularity together with clinical and biochemical hyperandrogenism in T1D adolescent girls. However, it did not improve their glycemic control.
Clinical utility of stimulation tests in infants with suspected adrenal insufficiency (AI)
Authors: Brar Preneet Cheema
Published: April 2019

Diagnosis of adrenal insufficiency (AI) in infants can be difficult. While a low random cortisol can signal AI, often confirmatory tests are required when clinical suspicion is strong but the cortisol levels are equivocal. Several studies have demonstrated that in sick preterm infants, there is relative adrenal insufficiency (RAI) defined as an inadequate cortisol production relative to the degree of stress or illness, a condition which can last for several weeks, while in term infants the adrenal axis is mature at birth (Bagnoli F, Mori A, Fommei C, Coriolani G, Badii S, et al. ACTH and cortisol cord plasma concentrations in preterm and term infants. J Perinatol 2013;33:520–4). Adrenocorticotrophic hormone (ACTH) and corticotrophin releasing hormone (CRH) stimulation tests have been validated in infants in several studies. In light of recent reports of false-negative results of stimulation tests, it is imperative to highlight the pitfalls of these tests. The purpose of this communication is to bring attention to the accuracy of timing of these tests in infants.
Computerized fetal cardiotocography analysis in early preterm fetal growth restriction – a quantitative comparison of two applications
Authors: Wolf Hans , Bruin Claartje , Dobbe Johannes G.G. , Gordijn Sanne J. , Ganzevoort Wessel
Published: April 2019

Background

We developed an open-source software for the computerized analysis of antenatal fetal cardiotocography (CTG) without limitation of duration of the registration, enabling batch processing and adaptation to any digital storage system.

Methods

STVcalc was developed based on literature about the FetalCare system (Huntleigh Healthcare Ltd, Cardiff, UK). For comparison with FetalCare, we selected the CTGs of all women who delivered in 2011 a small-for-gestational-age (SGA) fetus between 24 and 31 weeks by cesarean section (CS) for fetal distress, or had fetal death, before labor onset.

Results

In 471 CTGs from 39 women, the agreement was 99% for a short-term variation (STV) cut-off of 2.6 ms below 29 weeks and 3.0 ms thereafter, and 95% for 3.5 and 4.0 ms, respectively. In 18 (4%) cases, the proportional difference in STV between FetalCare and STVcalc was more than 10%.

Conclusion

As only slight differences were observed between the proposed feature-rich application and the FetalCare system, it can be considered valuable for clinical practice and research purposes.
The evaluation of ENA-78 and fibrinogen levels for the differential diagnosis of familial Mediterranean fever and acute appendicitis
Authors: Güzel Murat , Aktimur Recep , Yıldırım Kadir , Aktimur Sude Hatun , Taşkın Mehmet Hakan , Demir Mehmet Cihat , Demirağ Mehmet Derya
Published: April 2019

Background

Familial Mediterranean fever (FMF) is a disorder mainly present in the Mediterranean region, characterized by abdominal attacks that mimic acute peritonitis. Therefore, FMF might be confused with other conditions presenting with acute abdominal pain, particularly acute appendicitis (AA). We aimed to evaluate whether epithelial-derived neutrophil-activating peptide-78 (ENA-78) and fibrinogen levels and white blood cell (WBC) counts could be used as potential markers in the differential diagnosis of acute FMF attacks and AA.

Methods

The study involved three groups: patients with AA who underwent surgery (group 1, n = 30), patients with FMF attacks (group 2, n = 30), and patients with FMF who were attack-free (n = 30, controls), which included patients who were diagnosed as having FMF previously but had no attacks for a month.

Results

Significant differences were detected in the ENA-78 and fibrinogen levels between group 1 and group 2. No significant difference was found in the WBC count between group 1 and group 2. It was concluded that the WBC count was more sensitive (66%) for group 1, and fibrinogen showed higher sensitivity (86%) and specificity (96%) for group 2 compared with the other parameters.

Conclusions

We suggest that AA can be distinguished in patients with signs of peritonitis who were diagnosed as having FMF previously with the use of ENA-78 and fibrinogen levels; fibrinogen and ENA-78 might be helpful in discriminating between FMF attacks and AA.
Examining language policy and practices on the ground: German and French in the public space of two Walloon municipalities with language facilities
Authors: Prieto Raúl Sánchez
Published: April 2019

Building on previous research on the new subfield of Linguistic Landscape (LL), this article adopts a comparative approach to study language policy practices that take place on the ground in East Belgium, a language contact area which is not usually considered conflictive. The research design is both qualitative and quantitative and aimed at overcoming some critical methodological issues. The taxonomy, which distinguishes different types of items in the LL of two municipalities with language facilities, Kelmis and Waimes, has led to a detailed qualitative analysis of the application of the current language legislation.
Global Stability Analysis of a General Model of Zika Virus
Authors: Bessey K. , Mavis M. , Rebaza J. , Zhang J.
Published: April 2019

Mathematical models of Zika virus dynamics are relatively new, and they mostly focus on either vector and horizontal, or vector and vertical transmission only. In this work,we first revisit a recent model that considers vector and vertical transmission, and we provide an alternative proof on the global stability of the disease-free equilibrium point. Then, a new and general model is presented which includes vector, horizontal and vertical transmission. For this new model, existence of both a disease-free and an endemic equilibrium is studied. Using matrix and graph-theoretic methods, appropriate Lyapunov functions are constructed and results on the global stability properties of both equilibria are established.
Highly efficient plasmonic nanofocusing on a metallized fiber tip with internal illumination of the radial vector mode using an acousto-optic coupling approach
Authors: Liu Min , Lu Fanfan , Zhang Wending , Huang Ligang , Liang Shuhai , Mao Dong , Gao Feng , Mei Ting , Zhao Jianlin
Published: April 2019

Tip-based plasmonic nanofocusing, which delivers light into a nanoscale region and achieves localized electromagnetic (EM) field enhancement beyond the diffraction limit, is highly desired for light-matter interaction-based super-resolution imaging. Here, we present the plasmonic nanofocusing at the apex of a silver (Ag)-coated fiber tip with the internal illumination of a radial vector mode (RVM) generated directly in an optical fiber based on an acoustically-induced fiber grating (AIFG). As illustrated by theoretical calculation, a picture of the nanofocusing plasmonic tip given by analyzing the mode conversion process that the surface plasmon polariton (SPP) mode excited via the radial polarization optical mode can propagate to the apex of the plasmonic tip for nanofocusing because it is not cut off as the tip radius decreases; while the SPP mode which transited from the linear polarization optical mode cannot propagate to the tip apex for nanofocusing because it is cut off as the tip radius decreases. The electric field intensity enhancement factor

|

E

apex

2

|
/
|

E

input

2

|

$|{\rm{E}}_{{\rm{apex}}}^{\rm{2}}|/|{\rm{E}}_{{\rm{input}}}^{\rm{2}}|$

of a plasmonic tip with a tip radius of 20 nm was calculated to be ~2 × 103. Furthermore, the electric field enhancement characteristic at the tip apex was also experimentally verified by using surface-enhanced Raman spectroscopy (SERS). The Raman scattering intensity was observed to be ~15 times as strong as that with internal illumination using the linear polarization mode (LPM), revealing their significantly different nanofocusing characteristics. A Raman sensitivity of 10−14
m was achieved for the target analyte of malachite green (MG), denoting significant electric field enhancement and effective plasmonic nanofocusing. The energy conversion efficiency of the radial polarization optical mode to the corresponding SPP mode at the tip apex was measured to be ~17%. This light delivery technique can be potentially further exploited in near-field microscopy with improved resolution and conversion efficiency.
Measuring circular phase-dichroism of chiral metasurface
Authors: Zhang Ranran , Zhao Qiuling , Wang Xia , Gao Wensheng , Li Jensen , Tam Wing Yim
Published: April 2019

The ability of chiral media to differentiate circularly polarized light is conventionally characterized by circular dichroism (CD) which is based on the difference in the absorption of the incident light for different polarizations. Thus, CD probes the bulk properties of chiral media. Here, we introduce a new approach termed as circular phase-dichroism that is based on the surface properties and is defined as the difference of the reflection phase for different circularly polarized incident lights in characterizing chiral media. As a demonstration, we measure the reflection phase from planar chiral sawtooth metasurface for circularly polarized light in the visible range using a simple Fabry Perot interference technique. The measured circular phase-dichroism is also crosschecked by conventional CD measurement of the transmitted light and by full-wave simulations. Our results demonstrate the potential applications of circular phase-dichroism in sensing and metasurface characterizations.
The crystal structure of (E)-1-(4-methoxyphenyl)-3-(2-nitrophenyl)triaz-1-ene C8H8N2O4
Authors: Gao Dong-Mei , Liu Lu , Tang Meng , He Chunting , Du Zhen-Ting
Published: April 2019

C8H8N2O4, monoclinic, C2/c (no. 15) , a = 27.748(5) Å, b = 5.6488(10) Å, c = 16.437(3) Å, β = 93.393(3)°, V = 2571.87 Å3, Z = 8, R
gt(F) = 0.0330, wR
ref(F
2) = 0.0963, T = 296(2) K.
The crystal structure of dichlorido-bis(1-butyl-1H-imidazole-κN)zinc(II), C14H24Cl2ZnN4
Authors: Li Zongmu
Published: April 2019

C14H24Cl2ZnN4, orthorhombic, Pbca (no. 61), a = 13.3238(11) Å, b = 15.9366(13) Å, c = 18.0943(16) Å, V = 3842.1(6) Å3, Z = 8, R
gt(F) = 0.0393, wR
ref(F
2) = 0.1053, T = 298(2) K.
Crystal structure of diaqua-bis(3-carboxy-5-bromoisophthalato-κO)-bis(1-(3-(1H-benzo[d]imidazol-1-yl)propyl)-1H-benzo[d]imidazol-3-ium-κN)nickel(II) bis(3-carboxy-5-bromoisophthalate), C66H54Br4N8NiO18
Authors: Han Min-Le
Published: April 2019

C66H54Br4N8NiO18, triclinic, P1̄ (no. 2), a = 8.821(2) Å, b = 14.6587(14) Å, c = 14.8211(14) Å, α = 119.608(1)°, β = 95.365(1)°, γ = 99.249(1)°, V = 1610.8(5) Å3, Z = 1, R
gt(F) = 0.0345, wR
ref(F
2) = 0.0815, T = 296(2) K.
Crystal structure of dichlorido-bis(N-benzyl-2-(quinolin-8-yloxy)acetamide-κ2
N,O)copper(II) — ethyl acetate (1/1), C38H36N4O6Cl2Cu
Authors: Wang Wan-Wan , Deng Xiao-Wei , Wu Wei-Na
Published: April 2019

C38H36N4O6Cl2Cu, triclinic, P1̄ (no. 2), a = 10.749(5) Å, b = 11.074(5) Å, c = 15.951(7) Å, α = 80.471(8)°, β = 80.987(8)°, γ = 77.283(8)°, V = 1812.3(14) Å3, Z = 2, R
gt(F) = 0.0465, wR
ref(F
2) = 0.1279, T = 296(2) K.
Crystal structure of 6-hydroxy-4,8,11b-trimethyltetradecayhdro-8,11-epoxy-6a,9-methanocyclohepta[a]naphthalene-4-carboxylic acid – methanol (1/1), C20H30O4
Authors: Zou Juan , Tang Tian-Tian , Ye Jiang-Hai , Zhao Chen-Liang , He Kang , Pan Lu-Tai
Published: April 2019

C20H30O4, orthorhombic, P21212 (no. 18), a = 12.6727(4) Å, b = 19.8422(7) Å, c = 7.5471(3) Å, V = 1897.75(12) Å3, Z = 2, Rgt
(F) = 0.0448, wR
ref(F
2) = 0.1311, T = 243(2) K.
Crystal structure of hemikis(cyclohexane-1,4-diammonium) (pyridine-2-carboxylate), [C6H16N2]0.5[C6H4NO2]
Authors: Tan Sang Loon , Tiekink Edward R.T.
Published: April 2019

[C6H16N2]0.5[C6H4NO2], triclinic, P1̄ (no. 2), a = 6.7956(2) Å, b = 7.2840(3) Å, c = 10.2615(4) Å, α = 70.483(3)°, β = 80.902(3)°, γ = 66.404(3)°, V = 438.55(3) Å3, Z = 2, R
gt(F) = 0.0359, wR
ref(F
2) = 0.0988, T = 100(2) K.
Crystal structure of catena-poly[(μ2-azido-κ2
N:N)(μ2-4-cyanobenzoato-κ2
O:O′)-(μ2-methanol-κ2
O:O)copper(II)], C9H8CuN4O3
Authors: Li Dong , Deng Ping-Ping , Wu Li
Published: April 2019

C9H8CuN4O3, triclinic, P1̄ (no. 2), a = 6.3568(4) Å, b = 8.8323(6) Å, c = 10.8584(7) Å, α = 103.891(1)°, β = 94.868(1)°, γ = 105.453(1)°, V = 563.16(6) Å3, Z = 2, R
gt(F) = 0.0245, wR
ref(F
2) = 0.0701, T = 296(2) K.
Crystal structure of chlorido-4-fluorobenzyl-bis(2-methylquinolin-8-olato-κ2
N,O)tin(IV), C27H22ClFN2O2Sn
Authors: Lee See Mun , Lo Kong Mun , Tiekink Edward R.T.
Published: April 2019

C27H22ClFN2O2Sn, tetragonal, P41 (no. 76), a = 9.38970(10) Å, c = 26.2753(4) Å, V = 2316.60(6) Å3, Z = 4, R
gt(F) = 0.0141, wR
ref(F
2) = 0.0381, T = 293(2) K.
Measurement and classification of human characteristics and capabilities during interaction tasks
Authors: Villani Valeria , Czerniak Julia N. , Sabattini Lorenzo , Mertens Alexander , Fantuzzi Cesare
Published: April 2019

In this paperwe address the need to design adaptive interacting systems for advanced industrial production machines. Modern production systems have become highly complex and include many subsidiary functionalities, thus making it difficult for least skilled human operators interact with them. In this regard, adapting the behavior of the machine and of the operator interface to the characteristics of the user allows a more effective interaction process, with a positive impact on manufacturing efficiency and user’s satisfaction. To this end, it is crucial to understandwhich are the user’s capabilities that influence the interaction and, hence, should be measured to provide the correct amount of adaptation.Moving along these lines, in this paper we identify groups of users that, despite having different individual capabilities and features, have common needs and response to the interaction with complex production systems. As a consequence,we define clusters of users that have the same need for adaptation. Then, adaptation rules can be defined by considering such users’ clusters, rather than addressing specific individual user’s needs.
Effects of MAH/St grafted nanocellulose on the properties of carbon reinforced styrene butadiene rubber
Authors: Xu Yingni , Li Caixin , Gu Ju
Published: April 2019

Nanocellulose was extracted from bagasse (bagasse nanocellulose, BNC) by hydrolysis with alkali and acid, then grafted by maleic anhydride (MAH) and styrene (St). The modified nanocellulose (BMS) was further investigated to partially replace carbon black (CB) in St butadiene rubber (SBR) composites via coagulation to prepare SBR/BMS/CB composites. Through the comparison of the vulcanization characteristics, processing properties, mechanical properties, and dynamic mechanical performance of them, BMS proved to be more efficient than BNC. The results showed that BMS could activate the vulcanization process, suppress the Payne effect, and increase the modulus and hardness. Moreover, a fine BMS dispersion and strong interfacial interaction were achieved in SBR/BMS/CB composites. The observed reinforcement effects were evaluated based on the results of G′, tanδ and scanning electron microscopy (SEM) analyses of SBR/BMS/CB in comparison with SBR/BNC/CB composites.
Cheminformatics techniques in antimalarial drug discovery and development from natural products 1: basic concepts
Authors: Egieyeh Samuel , Malan Sarel F. , Christoffels Alan
Published: April 2019

A large number of natural products, especially those used in ethnomedicine of malaria, have shown varying in vitro antiplasmodial activities. Facilitating antimalarial drug development from this wealth of natural products is an imperative and laudable mission to pursue. However, limited manpower, high research cost coupled with high failure rate during preclinical and clinical studies might militate against the pursuit of this mission. These limitations may be overcome with cheminformatic techniques. Cheminformatics involves the organization, integration, curation, standardization, simulation, mining and transformation of pharmacology data (compounds and bioactivity) into knowledge that can drive rational and viable drug development decisions. This chapter will review the application of cheminformatics techniques (including molecular diversity analysis, quantitative-structure activity/property relationships and Machine learning) to natural products with in vitro and in vivo antiplasmodial activities in order to facilitate their development into antimalarial drug candidates and design of new potential antimalarial compounds.
A response surface model of morphological changes in UO₂ and U₃O₈ following high temperature aging
Authors: Olsen Adam M. , Schwerdt Ian , Jolley Alex , Halverson Nick , Richards Bryony , McDonald IV Luther W.
Published: April 2019

The morphological changes that take place during the processing and storage of uranium oxides can provide valuable information on the processing history and storage conditions of an interdicted sample. In this study microstructural changes in two uranium oxides (UO2 and U3O8) due to changes in the aging conditions at elevated temperatures were quantified and modeled using a response surface methodology approach. This allowed the morphological changes to be used as a signature for the aging conditions for nuclear forensic analysis. A Box-Behnken design of experiment was developed using the independent variables: temperature from 100 to 400 °C, aging times from 2 to 48 h, and partial pressure of

O
2

(

P

O
2

)

${{\rm{O}}_2}({{\rm{P}}_{{{\rm{O}}_{\rm{2}}}}})$

between ~0.0 kPa and 21.3 kPa. The design of experiment consisted of 54 samples per uranium oxide. Each aged sample was characterized using scanning electron microscopy (SEM) for image analysis. Utilizing the Morphological Analysis for Materials (MAMA) software package, particle size and shape were quantified using the acquired SEM images. Analysis of the particle attributes was completed using the Kolmogorov–Smirnov two sample test (K–S test) to determine if the particle size and shape distributions were statistically distinct. This data was then used to create response surfaces of the quantitative morphological changes based on the developed design of experiment. The U3O8 samples showed no statistically quantifiable differences due to the aging conditions. However, the UO2 samples had distinct morphological changes due to the experimental aging conditions. Specifically, the temperature factor had an increasing effect on the particle area, and a decreasing effect on particle circularity.
An investigation of effects of level density models and gamma ray strength functions on cross-section calculations for the production of 90Y, 153Sm, 169Er, 177Lu and 186Re therapeutic radioisotopes via (n,γ) reactions
Authors: Şekerci Mert , Özdoğan Hasan , Kaplan Abdullah
Published: April 2019

One of the methods used to treat different cancer diseases is the employment of therapeutic radioisotopes. Therefore, many clinical, theoretical and experimental studies are being carried out on those radioisotopes. In this study, the effects of level density models and gamma ray strength functions on the theoretical production cross-section calculations for the therapeutic radioisotopes 90Y, 153Sm, 169Er, 177Lu and 186Re in the (n,γ) route have been investigated. TALYS 1.9 code has been used by employing different level density models and gamma ray strength functions. The theoretically obtained data were compared with the experimental data taken from the literature. The results are presented graphically for better interpretation.
The initial evaluation of performance of hard anti-wear coatings deposited on metallic substrates: thickness, mechanical properties and adhesion measurements – a brief review
Authors: Łępicka Magdalena , Grądzka-Dahlke Małgorzata
Published: April 2019

The demand for metallic materials of exceptional tribological performance is rapidly growing due to constant development of automotive, tool or implant industry. As great attention nowadays is being paid to the surfacemodified materials, there is a need of establishing reliable methods for evaluation of coated metallic alloys. In this paper, methods for thickness, adhesion and mechanical properties measurement of anti-wear coatings are considered. The importance of altering the mechanical properties of the coating with regards to its expected wear performance is also discussed. According to the numerous findings, it is reasonable to pay attention to the hardness and Young’s modulus of the developed coating, as well as on the mismatch between its Young’s modulus and the elastic modulus of the substrate material. Information provided in this paper has been thoroughly illustrated and enriched with our own experience in the field.
Experimental review of thermal analysis of dissimilar welds of High-Strength Steel
Authors: Bayock Francois Njock , Kah Paul , Mvola Belinga , Layus Pavel
Published: April 2019

Dissimilar welding offers exiting benefits for a wide range of engineering applications, such as automotive bodies, piping systems of nuclear power plants, health equipment. The main advantages of dissimilarwelding applications areweight reductions, lower costs, unique properties combinations, and improved energy-efficiency. The properties of dissimilar weld depend on the type of welding process used, the accuracy of the process parameters control, the characteristics of the base metal and the heat treatment procedures. The current study reviews the scientific literature on the topic of thermal analysis of dissimilar high-strength steels (HSS) welding. The review of experimental data was carried out to analyze the variable heat input effect on dissimilar welds. The results indicate the welds mechanical properties irregularity and reduction in toughness and tensile strength due to uneven changes in the microstructure. Furthermore, postweld heat treatment (PWHT) often resulted in the formation of intermetallic compounds whose properties are dependent on the duration of treatment. The research results can be used to optimize the heat input of the HSS welding process.
Freeze-Thaw Resistance of Cement Screed with Various Supplementary Cementitious Materials
Authors: Reiterman Pavel , Holčapek Ondřej , Zobal Ondřej , Keppert Martin
Published: April 2019

This paper describes a study of the effect of partial replacement of ordinary Portland cement (OPC) by various mineral additives in the screed mixtures. Ceramic powder, blast furnace slag and fly ash were gradually employed in increments of 12.5 wt.% up to 50 wt.% to replace OPC. The mixtures were designed to a constant consistency. The influence of mineral additives was evaluated in terms of the air content in the fresh mixtures, the compressive strength, the flexural strength and the freeze-thaw resistance and using non-destructive measurements after 28 and 90 days. The accompanied paste sampleswere analysed using thermogravimetry to monitor the hydration process by means of total bound water content. The decrease in the mechanical properties and the frost resistance of the mixtures with the mineral additives were recorded, because of the necessity for a larger addition of water. According to the valid standards for concrete screed related to the frost resistance, it could be concluded that maximal suitable cement replacement contents are 12.5, 37.5 and 50 wt.% for ceramic powder, fly ash and blast furnace slag, respectively. The freeze-thaw resistance of the studied materials was found to be strongly related to the content of CSH and CAH hydrates.
Preparation of POSS-triol/wollastonite composite particles by Liquid phase mechanochemical method and its application in UV curable coatings
Authors: Chen Qishen , Xue Feng , Ding Enyong
Published: April 2019

POSS-coated wollastonite composite particles were prepared by the liquid phase mechano-chemical grinding of wollastonite and POSS powder together in the high pressure homogenizer [1, 2, 3, 4] for the first time. And then we prepare UV curable coatings of vinyl trimethoxy silane(VTMS) / butyl acrylate (BA) with different content of composite particles [5]. Nuclear magnetic resonance spectroscopy, scanning electron microscopy and infrared spectra were used to investigate the microstructures and morphologies of the composite. The properties of the coatings are tested by FTIR, SEM, water contact angles and so on. The results indicate that the POSS was successfully loaded on the surface of silica fume to prepare composite particles and when the addition of the composite particles is 12%, the water contact angle of the UV curable coating reaches 151.96∘, and the mechanical properties of the coating are also qualified.
Sulfur-33 NQR investigation of the electric-field-gradient tensor in an organosulfur compound
Authors: Yamada Kazuhiko , Aoki Daisuke , Nakazono Kazuko , Takata Toshikazu
Published: April 2019

33S nuclear quadrupole resonance (NQR) frequencies of 33S-enriched S-4-phenyl 4-toluenethiosulfonate were observed in the range of 22.96–23.31 MHz at temperatures between 110 and 300 K. A single sharp signal was observed at all the temperatures. The two-dimensional (2D) nutation echo method was applied at 150 K, providing the 33S electric field gradient (EFG) tensor information, the quadrupolar coupling constant, C
Q, of 42.3 MHz and the asymmetry parameter, ηQ, of 0.80(9). Quantum chemical calculations were performed to obtain the 33S EFG tensor orientations with respect to the molecular frame.
Preparation, Physical Characterization and Adsorption Properties of Synthesized Co–Ni–Cr Nanocomposites for Highly Effective Removal of Nitrate: Isotherms, Kinetics and Thermodynamic Studies
Authors: Rahdar Somayeh , Rahdar Abbas , Ahmadi Shahin , Mehdizadeh Zhara , Taghavi Mahmoud
Published: April 2019

In the current effort, the Co–Ni–Cr Nanocomposites were synthesized by chemical method and characterized by means of scanning electron micrographs (SEM), X-ray diffraction (XRD), Fourier trans from infra-red (FTIR), and vibration sample magnetization (VSM). In the final step, these nanoparticles were used to study the nitrate removal efficiency from aqueous solution. The effect of important factor including pH, concentration of Nitrate (NO3
−) ion, contact time and nanoparticle dose were studied in order to find the optimum adsorption conditions. A maximum of removal of the nitrate was observed at pH 4, initial concentration of 40 mg L−1, amount of nanoparticle of 0.06 g L−1 and contact time 60 min. The adsorption isotherm values were obtained and analyzed using the Langmuir, Frenudlich, Temkin and Dubinin–Radushkevich equations, the Temkin isotherm being the one that showed the best correlation coefficient (R2 = 0.999). In addition to, the adsorption kinetics studied by the pseudo-first-order, pseudo-second-order, Elovich model, Ritchie and intraparticle diffusion models. The experimental data fitted to pseudo-second-order (R2 = 0.999).
Teaching Climate Science to Increase Understanding & Receptivity
Authors: Watts Elizabeth
Published: April 2019

Only about half of Americans are convinced that human activity is the major cause of climate change. This statistic highlights the increased need for high-quality climate science education but also highlights the fact that lessons on this subject are often complicated as denial argumentation abounds in classrooms. In order to achieve greater efficacy of and receptivity to climate science instruction, I propose the inclusion of lessons on the nature of science and the reframing of lessons in terms of risk management.
THE IMPLANTATION OF CHARACTER VALUES TOWARD STUDENTS THROUGH CONGKAK GAME FOR MATHEMATICS INSTRUCTIONAL MEDIA
Authors: Agusti Fardatil Aini , Zafirah Afifah , Engkizar Engkizar , Anwar Fuady , Arifin Zainul , Syafril Syafrimen
Published: April 2019

This research aims to investigate character values that can be applied on students through congkak game as it is used as a media of mathematics learning. This study used qualitative and quantitative combination or (Exploratory mixed methods designs). The first phase of qualitative data was taken through in-depth interviews to 5 selected informants using purposive sampling technique. The first phase of the data retrieval was intended to gather information related to the content of character values contained in  congkak game. All data interviews were analyzed thematically using NVivo qualitative analysis tool 10. Then, the second phase of the data was taken using a questionnaire to 46 students who were studying in grade V and VI in an elementary school (SD). The second phase of the data retrieval was intended to support the first phase of the research results, the entire data of the second phase analyzed descriptively using quantitative analysis tools SPSS Windows 18.0. Overall, the results of the two phases indicated that there were nine character values contained in the game congkak once it was used as a medium of mathematics learning. The nine-character values were honesty, discipline, hard working, creativity, curiosity, independent, communicativeness, responsibility and appreciation for achievements. The results also proved that the use of instructional media such as traditional game congkak can be used as an intermediary that can be used by teachers in mathematics learning process. In addition, this study shows that even though congkak game belongs to a traditional game among middle societies, in fact, there were characters values as it was investigated scientifically.
HUBUNGAN PERILAKU POSITIF DALAM PRAKTIKUM DAN KETERLAKSANAAN BIMBINGAN KARIR DENGAN KESIAPAN BERKARIR DI DUNIA INDUSTRI SISWA SMKN KELAS XII PROGRAM KEAHLIAN MULTIMEDIA DI KOTA MALANG
Authors: Kholifah Annisa Dwi Nur , Putro Setiadi Cahyono , Rahmawati Yuni
Published: April 2019

Penelitian ini bertujuan untuk mengungkap signifikansi hubungan antara perilaku positif dalam praktikum (X1)dan keterlaksanaan bimbingan karir (X2)secara simultan terhadap kesiapan berkarir di dunia industri dan besar kontribusinya. Jumlah sampel sebanyak 157 siswa dengan menggunakan teknik simple random sampling. Pengambilan data menggunakan kuesioner tertutup yang telah memenuhi kriteria validitas dan reliabilitas. Teknik analisis data menggunakan analisis regresi ganda. Hasil dari penelitian ini adalah terdapat hubungan yang positif dan signifikan antara (X1) dan (X2) terhadap (Y) secara simultan dengan nilai psig   <  pstandart yaitu 0,000 < 0,05.  Besarnya kontribusi (X1) dan (X2) terhadap (Y) sebesar 14,00% dengan persamaan garis regresi Y= 12,496 + 0,276X1 + 0,359X2.
EVALUASI PROFIL TPACK UNTUK GURU MATEMATIKA SEKOLAH MENENGAH PERTAMA DI BANTEN
Authors: Restiana Nena
Published: April 2019

Information and Communication Technology (ICT) has an influence overall areas, as well as on learning. Learning is required to adjust the development of ICT to make learning more effective and dynamic. Constraints faced in the implementation of ICT. It is the underlying to do research related to the teacher's understanding of technology. This study will analyze the profile of technological understanding of juniorhigh school mathematics teachers using TPACK framework. Furthermore, age factor, length of teaching, and gender are analyzed its effect on TPACK using analysis of variance (ANOVA). The results of this study are six validated TPACK components, obtained five components namely TK, CK, PCK, TPTCK, TPCK. Based on the TPACK framework of junior high school mathematics teachers in Banten obtained the highest average score on the CK component. Age factor, duration of teaching and gender have no significant effect or only small effect on the five components of TPACK
PENGARUH MEDIA VISUAL MENGGUNAKAN APLIKASI LECTORA INSPIRE TERHADAP HASIL BELAJAR PESERTA DIDIK SISWA KELAS XI DI SMA ISLAM SUNAN GUNUNG JATI NGUNUT TAHUN PELAJARAN 2017/2018
Authors: Ngubaidillah Ahmad , Kartadie Rikie
Published: April 2019

Abstract.  Improving the quality of learning is one of the basic, improvement of education as a whole. Efforts to improve the quality of education into an inte­grated part of efforts to improve human quality, both aspects of ability, per­sonality, and responsibility. One to improve the quality of the learning process is by using an effective media, attract students to learn and explain thoroughly the material to be delivered so that in the end can improve student learning outcomes.The design of this research is Quasi-Experimental Design with Research model of Nonequivalent Pretest-Postest Control Group Design. The sample of the re­search are 60 students selected by Sample Random Sampling.  Data analysis was done with parametric statistic with the prerequisite test included a normality test, homogeneity test, then tested different and influence test.The result showed that the average score of the control group was 70.61, for the experimental group the average score was 74.81. There is the difference of result of student learning between the control group and experiment group after learning using visual media using Lectora application and result of influence test show result of t-count 3,621> t-table equal to 2,052 with it can be concluded that there the influence of learning result after given treatment.
CASE-BASED LEARNING MENINGKATKAN CLINICAL REASONING PADA BLOK PENYAKIT INFEKSI TROPIS MAHASISWA FAKULTAS KEDOKTERAN UNIVERSITAS ISLAM INDONESIA
Authors: Sulistyoningrum Evy , Lusiyana Novyan
Published: April 2019

Case-based learning (CBL) is a newer modality of teaching healthcare, combining medical theory and practices. Many researchs reported effectivity of CBL to improve student-centered learning. The aim of this study is to evaluate how CBL improved students’ clinical reasoning compared with other method such as problem-based learning. An interventional research involved 4th grade medical students receiving PBL and CBL methods supervised by a tutor or instructure. An alternative method combining CBL and structured role play (in an Integrated-Patient Management method) also performed using clinical scenario with medical practice setting. The result showed that student received CBL had better clinical reasoning indicated from better miniquizz result compared with PBL students (p < 0,05, Mann Whitney U test. Students exposed with CBL had final MCQ and essay exam grade compared with unexposed students. Students exposed with CBL also had better clinical skill indicated from Objective Structure Clinical Examination (OSCE) result (p < 0,05, independent t test). Students’ acceptance level on CBL method is 79, 4%. It is concluded that compared with PBL, CBL is more effective in improved students’ performance, learning outcomes and clinical reasoning and also had high acceptance among medical students.
EVALUASI PENYELENGGARAAN PENDIDIKAN INKLUSI BERBASIS NILAI-NILAI PANCASILA DI SD NEGERI TAMAN SARI KOTA YOGYAKARTA
Authors: Indriani Fitri , Satrianawati Satrianawati
Published: April 2019

Penelitian ini merupakan jenis penelitian evaluasi program yang bertujuan untuk mengukur tingkat kesesuaian penyelenggaraan pendidikan inklusi berbasis nilai-nilai pancasila di SD Negeri Taman Sari Kota Yogyakarta. Data diperoleh dengan menggunakan angket yang disusun berbasis nilai-nilai Pancasila, khususnya sila pertama, kedua, dan kelima. Objek penelitian ini adalah guru dan kepala sekolah. Penelitian mengkaji tiga bagian dalam evaluasi program yaitu input, proses, dan output sekolah dalam menyelenggarakan pendidikan inklusi yang disesuaikan nilai-nilai Pancasila. Hasil penelitian melalui angket yang diberikan kepada kepala sekolah maupun guru menunjukkan bahwa input, proses dan output berada dalam kategori sangat baik yaitu ≥ 85%. Oleh karena itu, SD Negeri Taman Sari Kota Yogyakarta layak dikatakan sebagai sekolah penyelenggara Pendidikan inklusi berbasis Nilai-nilai Pancasila.
PENGARUH PENGGUNAAN DESAIN PEMBELAJARAN ELPSA DALAM MODEL PEMBELAJARAN VAK TERHADAP HASIL BELAJAR KIMIA SISWA PADA POKOK BAHASAN LARUTAN ELEKTROLIT DAN NON ELEKTROLIT
Authors: Kusumawardani Ratna , Pratiwi Ajeng Hayu , Muflihah Muflihah
Published: April 2019

Penelitian ini bertujuan untuk mengetahui pengaruh penggunaan desain pembelajaran ELPSA dalam model pembelajaran VAK terhadap hasil belajar kimia siswa pada pokok bahasan larutan elektrolit dan non elektrolit kelas X SMA Negeri 3 Samarinda. Teknik pengambilan sampel yang digunakan adalah purposive sampling sehingga diperoleh sampel penelitian yaitu siswa kelas X MIPA 1 dan X MIPA 2 dengan masing-masing kelas berjumlah 36 siswa. Kelas X MIPA 2 merupakan kelas yang menggunakan desain pembelajaran ELPSA dalam model pembelajaran VAK sedangkan kelas X MIPA 1 menggunakan model pembelajaran VAK. Hasil penelitian menunjukkan bahwa rata-rata nilai hasil belajar siswa yang menggunakan desain pembelajaran ELPSA dalam model pembelajaran VAK lebih baik daripada rata-rata hasil belajar siswa yang menggunakan model pembelajaran VAK. Rata-rata nilai hasil belajar siswa yang menggunakan desain pembelajaran ELPSA dalam model VAK adalah 81,06 dan rata-rata hasil belajar siswa yang menggunakan model pembelajaran VAK adalah 78,32. Berdasarkan hasil analisis dengan menggunakan uji t, diperoleh t hitung = 2,68 dan t tabel = 1,99 pada taraf signifikan 5%. Karena t hitung > t tabel, maka H diterima sehingga terdapat pengaruh penggunaan desain pembelajaran ELPSA dalam model pembelajaran VAK terhadap hasil belajar kimia siswa pada pokok bahasan larutan elektrolit dan non elektrolit kelas X SMA Negeri 3 Samarinda.
PENGEMBANGAN APLIKASI E-MINDMAPS PADA MATERI ILMU SOSIAL DAN BUDAYA DASAR MEMANFAATKAN GROUPWARE BERBASIS ANDROID
Authors: Kurniasari Praharisti , Mardikaningsih Agusti
Published: April 2019

Penelitian ini bertujuan untuk 1) mengidentifikasi kebutuhan pengembangan bahan ilmu sosial dan budaya dasar dengan mengunakan aplikasi emindmap memanfaatkan groupware berbasis android untuk meningkatkan motivasi mahasiswa, 2) menyusun bahan ajar ilmu sosial dan budaya dasar dengan menggunakan aplikasi emindmaps memanfaatkan groupware berbasis android untuk meningkatkan motivasi mahasiswa, 3) mendesiminasi desain produk (desain aplikasi emindmap) pada prodi – prodi sevisi. Jenis penelitian ini adalah penelitian pengembangan (Research and Development/ RD). Model pengembangan media dilakukan berdasarkan enam tahap, yaitu konsep (concept), perencanaan (design), pengumpulan bahan (material collecting), pembuatan (assembly), percobaan (testing) dan distribusi (distribution). Penelitian ini menghasilkan bahan ajar berupa aplikasi emindmaps berbasis android yang dapat meningkatkan motivasi mahasiswa. Data yang dihasilkan dari penelitian ini yaitu data hasil validasi materi yaitu 81,1% , kategori layak dengan predikat bagus; dan hasil validasi media yaitu 80,83% , kategori layak dengan predikat bagus.
EDUCATIONAL STORY BOOK BASED ON TOLERANCE CHARACTER AS AN INNOVATION OF INTRODUCING MULTICULTURAL EDUCATION
Authors: Fatmawati Laila , Khotijah Ayu Siti , Erviana Vera Yuli
Published: April 2019

Multicultural education is still very foreign to elementary school teachers and students. Need innovation in introducing multicultural education to elementary school students through educational story book. The aims of this study are: 1) developing educational story book based on tolerance character, 2) knowing the feasibility of the educational story book based on experts’ judgment, 3) knowing the responses of teachers and students after using educational story book. The development procedure adopted Borg and Gall model. Data collection techniques were questionnaires and interviews. Data analysis techniques was descriptive statistics and qualitative analysis of interactive model. Small group trial subject used six students in the 5th grade of Wirosaban Elementary School. While the large group trial used 20 students in the 5th grade of Pakel Elementary School. The results of the study are educational story book with the title "Berbeda tapi Sama (Divers but the Same)". The mean score of the experts’ assessment are from the learning material is 86,53, language expert is 87,5, and media expert is 88,33. The teacher response in the small group trial is 98,33 and the students’ response  is 99,58. The teacher's response in the large group trial is 81,66 and the students response is 97,87. All assessments from experts, teachers, and students are in a very good category. It can be concluded that educational story book with the title "Berbeda tapi Sama " is very feasible to be used to introduce multicultural education in elementary school students.
PENGEMBANGAN MEDIA GEOMETRY FUN ACTIVITY BERCIRI KONSERVASI
Authors: Sari Elok Fariha , Nugraheni Nursiwi , Trimurtini Trimurtini
Published: April 2019

Penelitian ini bertujuan untuk menghasilkan media Geometry Fun Activity berciri konservasi dengan menggunakan model ADDIE dan mengetahui kelayakan media Geometry Fun Activity. Penelitian ini termasuk penelitian pengembangan dengan menggunakan model ADDIE (Analysis, Design, Development, Implementation, Evaluation). Proses pengembangan media Geometry Fun Activity meliputi tahap: (1) analisis, (2) desain, (3) pengembangan, (4) implementasi, (5) evaluasi. Validasi media dilakukan oleh seorang ahli media dan ahli materi. Media yang dihasilkan diujicobakan kepada 30 orang mahasiswa semester 4 Jurusan Pendidikan Guru Sekolah Dasar Fakultas Ilmu Pendidikan Universitas Negeri Semarang (Jurusan PGSD FIP UNNES). Hasil pengembangan media Geometry Fun Activity ini berupa media latihan soal yang dikombinasikan dengan gambar yang bertema konservasi khususnya konservasi etika seni dan budaya. Hasil uji kelayakan menunjukkan bahwa media layak digunakan terbukti dengan validasi ahli media mendapatkan nilai 3,6 yang artinya masuk dalam kategori layak digunakan, ahli materi mendapatkan nilai 3,4 masuk dalam kategori layak digunakan tanpa revisi, dan respon positif mahasiswa sebanyak 95,2% menyatakan media layak digunakan. Penelitian ini diharapkan dapat digunakan sebagai salah satu referensi untuk melengkapi pembelajaran geometri, dapat memberikan sumbangan bagi pengembangan media geometri.