bluuebunny/crossref_metadata_2025_split huggingface dataset:
Effect of Different Polishing Systems on the Surface Roughness and Gloss of Novel Nanohybrid Resin Composites
Authors: Soliman Hanan A. N. , Elkholany Naglaa Rizk , Hamama Hamdi H. , EL-Sharkawy Fatma M. , Mahmoud Salah H. , Comisi John C. 
Published: October 2020

Abstract
Objectives To evaluate the surface roughness and gloss of three nanohybrid resin composites after polishing with three different polishing systems.
Materials and Methods A total number of 112 disc specimens (10 × 3 mm) were prepared from nanohybrid—Empress Direct (ID), Grandio (GR), Filtek Z350 (Z350) and a microhybrid resin composite restorative materials—Filtek Z250 (Z250). Following 24-hour storage in 37°C distilled water, each composite group (n = 28) was assigned into four groups (n = 7) according to finishing/polishing (F/P) system: Mylar strip, Optrapol, Politip, and Sof-Lex (SL). The surface roughness (Ra, mm) was measured by a novel three-dimensional method using an image analysis software attached to an environmental scanning electron microscope. A glossometer was used to measure the surface gloss.
Results Statistical analysis used was ANOVA test. Two-way Anova test revealed that the “type of composite” and “F/P techniques” had a significant effect on both surface roughness and gloss of the tested resin composite materials (p < 0.05). Tukey’s post hoc test showed that ID, GR, and Z350 revealed lower surface roughness and higher surface gloss than Z250 within the same polishing system (p < 0.05). Sof-Lex polishing discs produced the lowest surface roughness and highest surface gloss values compared with Optrapol and Politip (p < 0.05).
Conclusion The tested F/P systems provided comparable surface roughness and gloss for nanohybrid composites. The Sof-Lex system provided the best surface roughness and gloss for nanohybrid composites.
An Academic Orthopaedic Specialty Hospital Provides the Shortest Operative Times within a Single Health System for Primary and Revision Total Knee Arthroplasty
Authors: Bernstein Jenna A. , Zak Stephen , Schwarzkopf Ran , Rozell Joshua C. 
Published: October 2020

AbstractThe study aimed to optimize value-based health care practices in total joint arthroplasty (TJA), and we need to understand how the surgical setting can influence efficiency of care. While this has previously been investigated, the purpose of this study was to clarify if these findings are generalizable to an institution with an orthopaedic specialty hospital. A retrospective review was conducted of 6,913 patients who underwent primary or revision total knee arthroplasty (TKA) at one of four hospitals within a single, urban, and academic health system: a high volume academic (HVA) hospital, a low volume academic (LVA) hospital, a high volume community (HVC) hospital, or a low volume community (LVC) hospital. Patient demographics were collected in an arthroplasty database, as were operating room (OR) times and several specific time points during the surgery. The HVA (orthopaedic specialty) hospital had the shortest total primary TKA OR times and the LVC that had the longest times (156.69 vs. 174.68, p < 0.0001). The HVA hospital had the shortest total revision TKA OR times, and the LVC had the longest times (158.20 vs. 184.95, p < 0.0001). In our health system, the HVA orthoapedic specialty hospital had the shortest overall OR time, even when compared with the HVC hospital. This is in contradistinction to prior findings that HVC institutions had the shortest OR times in a health system that did not have an orthopaedic specialty hospital. This provides evidence that an orthopaedic specialty hospital can be a model for efficient care, even at an academic teaching institution.
Postoperative Management for Articular Cartilage Surgery in the Knee
Authors: Crecelius Cory R. , Van Landuyt Karra J. , Schaal Robert 
Published: October 2020

AbstractThe postoperative rehabilitation team plays a crucial role in optimizing outcomes after articular cartilage surgery. A comprehensive approach to postoperative physical therapy that considers the type of surgery, location in the knee, concurrent procedures, and patient-specific factors is imperative. While postoperative rehabilitation protocols should be specific to the patient and type of surgery performed and include phased rehabilitation goals and activities, the key principles for postoperative rehabilitation apply across the spectrum of articular cartilage surgeries and patients. These key principles consist of preoperative assessments that include physical, mental, and behavioral components critical to recovery; education and counseling with respect to expectations and compliance; and careful monitoring and adjustments throughout the rehabilitation period based on consistent communication among rehabilitation, surgical, and imaging teams to ensure strict patient compliance with restrictions, activities, and timelines to optimize functional outcomes after surgery.
The Effects of Applying Apparent Diffusion Coefficient Parameters on the Differentiation between Fourth Ventricular Ependymoma and Diffuse Intrinsic Pontine Glioma
Authors: Duc Nguyen Minh 
Published: October 2020

AbstractDistinguishing the fourth ventricular ependymoma from diffuse intrinsic pontine glioma (DIPG) is essential to improve the treatment strategy between these two tumor types. We attempted to evaluate the effects of applying apparent diffusion coefficient (ADC) values to the distinction between pediatric fourth ventricular ependymomas and DIPGs. Brain magnetic resonance imaging, including diffusion-weighted imaging and ADC, was assessed in 26 patients, who were divided into two groups: group 1 included 8 patients with fourth ventricular ependymoma and group 2 included 18 patients with DIPG. The Mann–Whitney U test was utilized to compare tumoral maximum (ADCmax), minimum ADC (ADCmin), mean ADC (ADCmean), and standard deviation (ADCsd) values, and the ratios between the tumor and parenchyma values for each of these parameters (rADCmax, rADCmin, rADCmean, and rADCsd, respectively) between the two groups. Cutoff values were calculated based on receiver operating characteristic curve analysis and the Youden index, and the area under the curve (AUC), sensitivity, and specificity were determined. The median ADCmax, ADCmin, ADCmean, rADCmax, rADCmin, and rADCmean values were significantly lower in group 1 than in group 2 (p < 0.05). For the differential diagnosis of ependymomas and DIPGs, a cutoff ADCmean value of 1.02 × 10−3 mm2/s was determined, which produced a sensitivity of 100%, a specificity of 88.9%, and an AUC of 95.8%. ADC parameters should be considered when performing a differential diagnosis between fourth ventricular ependymomas and DIPGs. Based on our findings, a cutoff ADCmean value of 1.02 × 10−3 mm2/s was the most significant and effective parameter for this purpose.
Insights on the crack modeling and effectiveness of piezoelectric energy harvesters
Authors: Salazar R , Larkin K , Abdelkefi A 
Published: October 2020

Abstract
A damage model for investigating the performance of cracked piezoelectric vibrational energy harvesters (VEHs) is developed. The crack model adopted does not alter the piezoelectric properties of the lead zirconate titanate patch but modifies the structural stiffness at the crack location following the Griffith’s strain release formulation. Multiple VEH configurations are considered to determine how the performance of various sized piezoelectric patches are impacted by multiple edge cracks. It is demonstrated that thicker piezoelectric patches are more severely impacted by cracks than thinner patches. The number of cracks, proximity of the cracks to the base of the VEH, and crack depth are shown to affect VEH performance. It is shown that severe cracks have a pronounced influence on the stiffness of the energy harvesting system, thus causing a deviation in the resonance region and amplitudes of the damaged system. The increased flexibility of the cracked piezoelectric patches increases the tip deflection and decreases the resonant frequency which can shift the initial optimal resistance to some higher value thus, greatly affecting the efficiency of piezoelectric energy harvesters.
Calculation of Feynman loop integration and phase-space integration via auxiliary mass flow *
Authors: Liu Xiao , Ma Yan-Qing , Tao Wei , Zhang Peng 
Published: October 2020

AbstractWe extend the auxiliary-mass-flow (AMF) method originally developed for Feynman loop integration to calculate integrals which also involve phase-space integration. The flow of the auxiliary mass from the boundary () to the physical point () is obtained by numerically solving differential equations with respective to the auxiliary mass. For problems with two or more kinematical invariants, the AMF method can be combined with the traditional differential-equation method, providing systematic boundary conditions and a highly nontrivial self-consistency check. The method is described in detail using a pedagogical example ofat NNLO. We show that the AMF method can systematically and efficiently calculate integrals to high precision.
Impact of green water anomalies on global rainfed crop yields
Authors: Borgomeo Edoardo , Khan Hassaan F , Heino Matias , Zaveri Esha , Kummu Matti , Brown Casey , Jägerskog Anders 
Published: October 2020

Abstract
The importance of green water (moisture from rain stored in soils) for global food and water security is widely recognized, with process-based simulation models and field-level studies demonstrating its role in supporting rainfed agriculture. Despite this evidence, the relationship between green water anomalies and rainfed agriculture has not yet been investigated using statistical models that identify a causal relationship between the variables. Here, we address this gap and use disaggregated statistical regression (panel data analysis) at the 30 arc-min grid level to study the response of observed yields (1982–2010) of four main crops (maize, rice, soybean and wheat) to green water anomalies globally over rainfed areas. Dry green water anomalies (1 or 2 standard deviations below long-term average) decrease rainfed crop yields worldwide. This effect is more pronounced for wheat and maize, whose yields decline by 12%–18% and 7%–12% respectively. Globally, agricultural production benefits from wet green water anomalies. This effect is intensified in arid climates and weakened in humid climates where, for wheat, soybean and rice, periods of green water availability 2 standard deviations above long-term averages lead to declines in crop yield. This confirms existing evidence that excess soil moisture is detrimental to crop yield. These findings (1) advance our understanding of the impact of green water on rainfed food production and (2) provide empirical evidence supporting arguments for better management of local green water resources to reduce the impact of agricultural drought and waterlogging on rainfed crop production and capture the yield increasing effects of positive green water anomalies.
On extremal eigenvalues of the graph Laplacian
*
Authors: Serio Andrea 
Published: October 2020

Abstract
Upper and lower estimates of eigenvalues of the Laplacian on a metric graph have been established in 2017 by Berkolaiko, Kennedy, Kurasov, and Mugnolo. Both these estimates can be achieved at the same time only by highly degenerate eigenvalues which we call maximally degenerate. By comparison with the maximal eigenvalue multiplicity proved by Kac and Pivovarchik in 2011, we characterize the graphs exhibiting maximally degenerate eigenvalues which are the figure-of-eight graph, the 3-watermelon graph, and the lasso trees—namely, trees decorated with lasso graphs.
Influence of TiO2’s (101) crystal facet exposure on the photoelectroactivity of TiO2 nanooctahedra/BiVO4 nanocomposite
Authors: Naumi F , Ivandini T A , Mulyana J Y , Pratomo U , Khalil M 
Published: October 2020

Abstract
This work studies a research regarding the effect of exposing (101) crystal facet of anatase TiO2 to photoelectroactivity of photoanode composed of TiO2 nanooctahedra/BiVO4 nanocomposite film. Here, the photoanode was fabricated by depositing the nanocomposite on the surface of FTO via doctor blade technique. In this study, anatase TiO2 nanooctahedra were synthesized via solvothermal method in the presence of hydrazine hydrate as a directing agent. Furthermore, the as-prepared TiO2 nanooctahedra was characterized using X-Ray Diffractometer (XRD), Transmission Electron Microscopy (TEM), Brunauer-Emmelt-Tellers (BET) and UV-Vis diffuse reflectance spectra (DRS). Based on the result, the diffraction peaks revealed characteristic for the pure anatase phase with exposure (101) crystal facet. Additionally, photoelectrochemical response of the photoanode was also evaluated using a three-electrode system and exhibited a significantly high current density value of 0.26 mA/cm2.
Modification of gold nanoparticles through allyl mercaptan bridge at boron-doped diamond electrode for an arsen (V) sensor
Authors: Magdalena O , Fauzillah N A , Riyanto H G , Ivandini T A 
Published: October 2020

Abstract
A simple, cheap and fast analytical procedure for arsen (V) detection was developed by applying the BDD (boron-doped diamond) modified by gold nanoparticles (AuNPs-BDD). The gold nanoparticles (AuNPs) with an average particle size of 10 nm was synthesized through reduction reaction of gold ions by NaBH4 in the presence of allyl mercaptan. These nanoparticles could be successfully deposited on the surface of boron-doped diamond (BDD) by an immersion process under the exposure of UV light ( λ = 254 nm) for 6 h. An Au/C ratio of around 1:56 was observed at the prepared AuNPs-BDD. Preliminary study for arsen (V) detection by using anodic stripping voltammetry (ASV) technique using this electrode in a solution of 0.1 M HCl containing of NaBH4 showed a good linearity (R2 = 0.99) of the current flow in the concentration range of 0–100 µM with a limit detection of 0.105 µM.
Characteristics of composite magnesium with micro SiC particle for automotive applications with stir casting method
Authors: Susilo N R , Syahrial A Z 
Published: October 2020

Abstract
Composite is a promoted material consists of two or more materials to enhance the properties mechanically. In this study, composites were created by mixing a matrix; magnesium and the reinforcement; SiC microstructure with the addition of a volume fraction of: 2 %vf, 4 %vf, 6 %vf and 8 %vf. This magnesium composite fabrication process is stirred casting. The results of this study show that the addition of SiC micro particles will enhance the properties of the composite–mechanical wise-, namely, wear resistance and hardness. The addition of SiC micro-reinforcing particles that produced the best magnesium composite was by adding 8 %vf volume fraction which produced a hardness value of 83 HB and a wear rate of 0.002015706 mm3/m. Increased mechanical properties in magnesium composites is caused by the reducing grain size and Orowan strengthening mechanism.
Structural and vibrational analysis of LaFe1-xMnxO3(x = 0.05, 0.10, 0.15 and 0.20) perovskite materials
Authors: Abdillah M N , Triyono D , Anugrah A W , Rafsanjani R A 
Published: October 2020

Abstract
Lanthanum orthoferrite (LaFeO3) and lanthanum manganite (LaMnO3) are the important family of perovskite compound which intensively studied and explored due to its applications as functional materials, such as a fuel cell electrode, photocatalytic and gas sensor. The performance of functional materials is strongly depended on their structural properties. Here, we investigated the structure and vibrational of LaFe1-xMnxO3 (x = 0.05, 0.10, 0.15 and 0.20) perovskite materials prepared by sol-gel method. The structural and optical properties of the materials were characterized by X-Ray diffraction (XRD) spectroscopy, Fourier Transform Infra-red (FTIR) spectroscopy, Raman spectroscopy, and Ultraviolet-Visible (UV-Vis) spectroscopy. The analysis of the XRD pattern confirmed the single-phase orthorhombic structure (space group: Pnma) following by the decreasing of lattice parameters, crystallite size, and Fe/Mn − O bond distance with the increasing of Mn-content. The presence of the Fe/Mn −O −Fe/Mn bending and Fe/Mn −O stretching modes has been confirmed by FTIR and Raman investigation. The optical band gap energy was measured by UV-Vis DRS spectroscopy, which obtained in the range of 1.99–2.14 eV. The band gap energy decreases with the increase of Mn-content.
Synthesis of biodegradable plastic from corn starch and corn husk filler with addition of glycerol as plasticizer and variation of chitosan composition
Authors: Azsarinka R , Saleh D , Djonaedi E 
Published: October 2020

Abstract
Cellulose, contained in corn husk, is one of natural polymer that can be used as filler for bioplastics. Corn starch flour (maize) as matrix and corn husk powder in different grain size as filler is then synthesized with chitosan and glycerol. The resulting bioplastics is a thin film with muddy-brown color. Alternating the corn husk powder grain size from 150 mesh to 200 mesh modifies the physical characteristics, especially mechanical properties. The most optimal bioplastics were obtained with 200 mesh grain size of corn husk powder and 0.04 % chitosan composition with tensile strength of 286.31 N/cm2, elongation of 10.19 %, Young modulus of 28.11 N/cm2 and tear resistance of 705.61 mN. There are changes in molecular structure of some functional groups as compared to the elements. Bioplastics were degraded 30–35 % for 21 days in soil, started moldy after 10 days in open air and endured for one hour in temperature 100 °C.
Synthesis and characterization of metal organic framework using succinic acid ligand with cobalt and iron metals as methylene blue dye adsorbent
Authors: Nurani D A , Butar B C B , Krisnandi Y K 
Published: October 2020

Abstract
Metal-organic Framework (MOF) as a porous material has a potency for an organic dye adsorbent due to its tunable pore size. It can be a good candidate for selective separation of organic dye waste because of its organic functionality, high thermal and stability. In this study, MOF based on cobalt (Co) and iron (Fe) cations with succinic acid ligand was utilized for Methylene Blue (MB) removal from aqueous solution. Co-MOF and Fe-MOF were synthesized using solvothermal method at 120 °C for 20 h and characterized by using infrared spectroscopy, X-Ray diffraction technique, thermogravimetric analyses, N2 adsorption-desorption isotherm, and scanning electron microscope. The adsorption of MB from aqueous solution by Co-MOF and Fe-MOF were carried out and their adsorption properties were investigated in various parameters such as pH solution, contact time, MOF loading. Moreover, their adsorption isotherm and reusable capacity were explored. As the results, the optimal adsorption was achieved at pH 9 for both MOFs, 5 mg of MOFs loading in 5 mL MB and 180 min for Co-MOF and 150 min for Fe-MOF. Both MOFs could be reused as a good adsorbent with the ratio of ethanol and H2O (70:30) as an eluent. This adsorption activity followed the Langmuir isotherm with the maximum adsorption capacity (Qm) of 3.9494 mg/g and 4.6685 mg/g for Co-MOF and Fe-MOF respectively.
Study of bioaccumulation and heavy metal depuration of cadmium in green mussel (Perna viridis)
Authors: Budiawan  , Bakri R , Aziz S A , Suseno H 
Published: October 2020

Abstract
Green mussel (Perna viridis) is a favorite seafood, which has good protein content and economical price. The shellfish habitat is in a polluted area in the Jakarta Bay caused by industrial waste. Presently, the consumption of green mussels is very problematic because the habitat of green mussels has experienced pollution. Bioaccumulation of heavy metal study was conducted to determine the process of heavy metal accumulation in a biota by using a certain dosage. The heavy metal cadmium was used to be exposed to a biota as much as half LC50 is 0.1 ppm. The depuration process was performed to reduce the levels of cadmium metal in green mussel. A seven-day drainage depuration method was used by immersing acetic acid and citric acid with variations of concentration 0.75 %, 1.5 %, and 2.25 % in 24, 48, 72, 96, 120 min variations. Levels of cadmium in green mussel were measured using atomic absorption spectrophotometry. Concentration of cadmium decreased to 3.05 mg.Kg−1, 1.7 mg.Kg−1 and 0.65 mg.Kg−1 after depuration process that used immersing by water, acetic acid and citric acid, respectively.
Microwave-assisted synthesis of 7-hydroxy-4-methyl coumarin and its bioactivity against acne-causing bacteria
Authors: Winata A W , Rahayu D U C , Handayani S , Dianhar H 
Published: October 2020

Abstract
Acne is a problem that often occurs in adolescents, especially at puberty phase. One of the acne-causing factors is proliferation of Propionibacterium acnes and Staphylococcus epidermidis bacteria. Acne is usually treated with antibiotics, but the resistance of antibiotics is also found. Therefore, research on new antibacterial compounds continues to be developed. One of the compounds reported to have antibacterial activity is coumarin derivatives. In this research, 7-hydroxy-4-methyl coumarin had been successfully synthesized from resorcinol and ethyl acetoacetate with the presence of p-toluene sulfonic acid (PTSA) as catalyst and solvent free reaction using 800W microwave-assisted method. This compound obtained in 48.36 % in yield with the reaction condition as follow: resorcinol/ethyl acetoacetate molar ratio of 1:1, 10 mol% PTSA, and 150s reaction time. Synthesized compound was further elucidated using FTIR, UV-Vis, and 1H-NMR spectral data. Unfortunately, study on the ability to inhibit the growth of P. acnes and S. epidermidis showed that the compound was inactive towards both acne-causing bacteria. Therefore, it can be concluded that 7-hydroxy-4-methyl coumarin did not have potential antibacterial activity against acne-causing bacteria.
Utilization of monosodium glutamate (MSG) for the synthesis of 1,8-dioxoacridine and polyhydro-quinoline derivates with SiO2-AA-glutamate catalyst and antioxidant ability test
Authors: Cahyana A H , Andika T , Liandi A R 
Published: October 2020

Abstract
Derivatives of 1,8-dioxoacridine and polyhydro-quinoline compounds are active compounds that have several beneficial bioactivities. The purpose of this research is to synthesize 1,8-dioxoacridine and polyhydro-quinoline derivatives supported by SiO2-AA-Glu as the catalyst and test their antioxidant activity. The reaction was conducted at the optimum condition with ethanol solvent at boiling point temperature (78 °C) for 60 min with a catalyst concentration of 3 % mol with a yield of 88.16 %. Analysis of formation products was confirmed using FTIR, UV-Vis Spectrophotometer, and GC-MS. The results of the analysis produced three 1,8-dioxoacridine and polyhydro-quinoline derivatives, namely 3,3,6,6-tetramethyl-9-phenyl-3,4,6,7,9,10-hexahydro-2H,5H-acridine-1,8-dione (compound 1), 9-(4-hydroxy-phenyl)-3,3,6,6-tetramethyl-3,4,6,7,9,10-hexahydro-2H,5H-acridine-1,8-dione (compound 2), and 7,7-dimethyl-5-oxo-4-phenyl-1,4,5,6,7,8-hexahydro-quinoline-3-carboxylic acid ethyl ester (compound 3). Compound 2 shows the best activity as an antioxidant compared to the other two compounds with an IC50 value of 83.72 ppm.