bluuebunny/crossref_metadata_2025 huggingface dataset:
Cell-Laden Thermosensitive Chitosan Hydrogel Bioinks for 3D Bioprinting Applications
Authors: Ku Jongbeom , Seonwoo Hoon , Park Sangbae , Jang Kyoung-Je , Lee Juo , Lee Myungchul , Lim Jae Woon , Kim Jangho , Chung Jong Hoon
Published: April 2020

Three-dimensional (3D) bioprinting is a technology used to deposit cell-laden biomaterials for the construction of complex tissues. Thermosensitive hydrogels are physically cross-linked by non-covalent interaction without using crosslinkers, facilitating low cytotoxicity and cell viability. Chitosan, which is a non-toxic, biocompatible and biodegradable polysaccharide, can be used as a thermosensitive hydrogel. Therefore, chitosan hydrogel could be of potential use as a 3D bioprinting ink. The purpose of this study was to develop and compare the effectivity of different bioinks based on chitosan hydrogels for 3D bioprinting. The solvent type did not affect the gel shape and gelation time, whereas acetic acid exhibited better biocompatibility compared to lactic and hydrochloric acids. The nature of the gelling agent was found to have a stronger influence on these characteristics than that of the solvent. The NaHCO3 moiety exhibited a higher growth rate of the storage modulus (G′) and a more irregular porous structure than that of the β-glycerophosphate (β-GP) and K2HPO4 groups. Cell viability, and live and dead assays, showed that the NaHCO3 group was more efficient for cell adhesion. The type of gelling agent did not lead to appreciable differences in cell-laden constructs. The NaHCO3 group was more amenable to bioprinting, compared to the β-GP and K2HPO4 groups. The chitosan hydrogel bioinks could, therefore, be good candidates for 3D bioprinting and would pave the way for patient-specific regenerative medicines.
Design and Experiment of Dry-Ice Cleaning Mechanical Arm for Insulators in Substation
Authors: Tang Shufeng , Zhou Pengfei , Wang Xu , Yu Yue , Li Hualei
Published: April 2020

Polluted flashover of insulators has always been a crucial hidden peril to the reliability of substation for supplying electricity. At present, the insulator of the substation is mainly cleaned manually in the case of power-cut, which greatly affects the reliability of power supply and operation safety. In this paper, an insulator dry-ice mechanical arm capable of electrified working is proposed. Under the regular operation of the power grid, the operator can remotely control the mechanical arm to clean the insulators of the substation with high-pressure gas mixed with dry-ice particles. This will not only ensure the regular operation of the power grid, but also greatly protects the safety of personnel. Considering the operation environment and high-voltage working conditions of the substation, the mechanism and control system of the dry-ice cleaning mechanical arm are designed, and the motion analysis, simulation, and strength analysis of the mechanical arm are carried out. Finally, the high-voltage-insulation test of the mechanical arm and the actual operation of the substation insulator cleaning working test are carried out, which proves that this mechanical arm can adapt to the operation environment of the substation, and the working is stable, safe, and reliable, which has an important application value to solve the problem in the cleaning of the substation insulator and other electrified equipment.
Comparative Analysis of Geothermal Energy in Korea Based on Closed Borehole and Single- and Two-Well Standing Column Well Geothermal Heat Exchange Systems
Authors: You Jangyoul , Lee Changhee
Published: April 2020

In this study, a mobile measuring device was developed and a thermal response test that applied a standing column well-type heat exchanger was conducted to obtain design parameters from field measurements. The main purpose of this study was to investigate the effects of thermal conductivity and geothermal resistance on site, including the flow and effects of natural convection of groundwater in boreholes. We compared, analyzed, and investigated the effective thermal conductivity of a borehole heat exchanger system and the effective thermal conductivity that was not applied when bleeding single-well standing column wells (SCWs), which is called an open-type standing column well geothermal heat exchanger system. We also investigated the heat transfer characteristics during the bleeding of two-well type SCWs, where water is injected from one clearing hole to the returning hole depending on the bleeding rate. Artificial recharging was used to inject the change of thermal conductivity from the bleeding rate of a geothermal heat exchanger into another SCW type. From the comparison results of the thermal conductivity of the multi-well and single-well underground heat exchangers, four times higher efficiency than the single-well was obtained. The reason for this is considered to be energy utilization utilizing groundwater energy.
Potential of Coal–Water Slurries as an Alternative Fuel Source during the Transition Period for the Decarbonization of Energy Production: A Review
Authors: Nunes Leonel J.R.
Published: April 2020

Coal–water slurry or coal–water mixture (CWS or CWM) is a complex solid–liquid dispersion. Several research works have been done concerning the production and use of CWSs being developed worldwide in several different governmental, industrial and academic facilities. In the present paper, studies on the developments achieved in the past three decades with regard to the field mentioned above are systematically reviewed, with particular regard to several different aspects during the combustion process. The structure and properties of the coal are highlighted, as are the different additives used and their adaptability with different types of coal, where the particle size distributions are of great importance in determining both the slurryability of coal and the rheological behavior of a produced CWS for its intended characteristics. At a time when there is much debate about the end of the age of coal as a primary source of thermal and electrical energy, alternative forms of use that can contribute to the reduction of pollutant emissions, as well as particles, in the atmosphere offer alternatives that may allow us to continue using coal, at least during this transition period until a viable alternative is found. In-depth knowledge of these coal slurries may allow, in the future, the development of similar products produced from fuels derived from biomass, such as charcoal or torrefied biomass.
A Novel Optimization Framework to Replicate the Vibro-Acoustics Response of an Aircraft Fuselage
Authors: Giannella Venanzio , Lombardi Riccardo , Pisani Matteo Maria , Federico Luigi , Barbarino Mattia , Citarella Roberto
Published: April 2020

In this work, a novel optimization framework, based on a Multi-Disciplinary Optimization (MDO) procedure, applied to the vibro-acoustic Finite Element Method (FEM) model of an aircraft fuselage mock-up, is proposed. The MDO procedure, based on an Efficient Global Optimization (EGO)-like approach, is implemented to characterize acoustic sources that replicate the sound pressure field generated by the engines on the fuselage. A realistic sound pressure field, evaluated by aeroacoustic simulations, was considered as the reference acoustic load, whereas two equivalent sound fields, displayed by two different arrays of microphones and generated by the same configuration of monopoles, were calculated by the proposed vibro-acoustic FEM-MDO procedure. The proposed FEM-MDO framework enables to set up ground experimental tests on aircraft components, useful to replicate their vibro-acoustic performances as if tested in flight. More in general, such a procedure can also be used as a reference tool to design simplified tests starting from more complex ones.
Autonomic Web Services Based on Different Adaptive Quasi-Asynchronous Checkpointing Techniques
Authors: Vargas-Santiago Mariano , Morales-Rosales Luis , Monroy Raul , Pomares-Hernandez Saul , Drira Khalil
Published: April 2020

Companies, organizations and individuals use Web services to build complex business functionalities. Web services must operate properly in the unreliable Internet infrastructure even in the presence of failures. To increase system dependability, organizations, including service providers, adapt their systems to the autonomic computing paradigm. Strategies can vary from having one to all (S-CHOP, self-configuration, self-healing, self-optimization and self-protection) features. Regarding self-healing, an almost identical tool is communication-induced checkpointing (CiC), a checkpoint contains the state (heap, registers, stack, kernel state) for each process in the system. CiC is based on quasi-synchronous checkpointing where processes take checkpoints relying of control information piggybacked inside application messages; however, avoiding dangerous patterns such as Z-paths and Z-cycles; in such a regard the system takes forced checkpoints and avoids inconsistent states. CiC, unlike other tools, does not incur system performance, our proposal does not incur high overhead (as results show), and it has the advantage of being scalable. As we have shown in a previous work, CiC can be used to address dependability problems when dealing with Web services, as CiC mechanism work in a distributed and efficient manner. Therefore, in this work we propose an adaptable and dynamic generation of checkpoints to support fault tolerance. We present an alternative considering Quality of Service (QoS) criteria, and the different impact applications have on it. We propose taking checkpoints dynamically in case of failure or QoS degradation. Experimental results show that our approach has significantly reduced the generation of checkpoints of various well-known tools in the literature.
Integration of Cranial Base and Face in Growing Subject
Authors: Oliva Giorgio , Zotti Rinaldo , Zotti Francesca , Dalessandri Domenico , Isola Gaetano , Oliva Bruno , Paganelli Corrado , Bonetti Stefano
Published: April 2020

Background: many papers investigate the role of the cranial base in facial development, but the results are not in agreement. This can be due to a difference between the central and lateral parts of the cranial base. The aim of the present study is to evaluate the relationship between the central and the lateral cranial base and the facial skeleton in pre-pubertal peak subjects and at the end of growth. Material/Methods: a total sample of 52 latero-lateral cranial teleradiographs were analyzed. To test the correlation between structures, the “Partial Least Square” analysis was performed. Geometric morphometric analysis were applied and partial least square analysis was used to test correlation. Integration was studied removing the effect of allometry. Results: facial skeleton has no significant relation with central cranial base. Facial skeleton has significant relationships with the lateral portion of the cranial base. This relationship is higher in the post-peak phase of growth. Conclusion: the Integration between facial structures and cranial base is significant. The Spatial orientation and shape of the facial structures are both influenced by cranial base. This is mainly due to the lateral portion of cranial base.
Investigation on the Measurement Method for Output Torque of a Spherical Motor
Authors: Wen Yan , Li Guoli , Wang Qunjing , Tang Runyu , Liu Yongbin , Li Haolin
Published: April 2020

The output torque is an important performance indicator of a motor. Due to the special structure of a permanent magnet spherical motor (PMSM), it is difficult to measure its torque. This paper proposes a novel method to measure the output torque of the PMSM. The proposed method uses the microelectromechanical system (MEMS) gyroscope to measure the rotor motion acceleration, which is then used to calculate the output torque based on the rotor dynamics equation. In this paper, we firstly simulate and analyze the output torque of the PMSM. Secondly, we design a torque-measuring device to measure the output torque. Thirdly, we compare and discuss the experimental and simulation results. The comparison results show that the proposed method is feasible.
Managerial Practitioners’ Perspectives on Quality Performance of Green-Building Projects
Authors: Raouf Ayman , Al-Ghamdi Sami
Published: April 2020

The quality performance of a green building will have an overarching effect on its objectives because of the high compliance needed to achieve superior performance expectations. Achieving sustainability objectives is challenging and requires the collaboration of diverse professionals that resume unique responsibilities. In this study, the different managerial practitioners involved in green-building projects were investigated in terms of their awareness levels regarding the quality performance measures, their perceived abilities to influence quality failure consequences, the degree to which the cost-of-quality (CoQ) of components can be evaluated, and the effect the sustainability traits have on the quality performance. Accordingly, a survey approach was adopted, and the results were analyzed using Pearson’s chi-squared (χ2) test, the relative importance index (RII), Mann–Whitney U-Test, and Student’s T-test. According to the results, the priorities of the different managerial types and their overall impressions of cost computability were different, which needs to be considered when CoQ evaluations are done based on practitioners’ views. In addition, the sustainability traits of green buildings impact achieving quality metrics with the consequences of design rework occurring in the construction stage may lead to denouncing sustainability traits. The results of this research study reveal the need to consider the differences between managerial types when evaluating CoQ for projects and the increased sensitivity for such evaluation in a green building context. The paper contributes to underscoring the important connection between quality performance and sustainability traits of a green building project and calls for researchers to formulate methods with more rigor to reach a set structure for quality cost accounting as an industry standard. Intricate evaluation methods will enable strategic decision making on quality performance budgets to be more substantiated.
Functionalization of Silica with Triazine Hydrazide to Improve Corrosion Protection and Interfacial Adhesion Properties of Epoxy Coating and Steel Substrate
Authors: Atta Ayman M. , Ahmed Mona A. , Tawfek Ahmed M. , El-Faham Ayman
Published: April 2020

The chemical bonding of modified filler surfaces with coating networks is an advanced approach for improving the interfacial adhesion force of fillers with coating and substrate surfaces. In this respect, silica gel surfaces were activated and modified by grafting 1,3–dihydrazide-2,4,6-triazine onto hydroxyl groups of activated silica surfaces. The chemical structure, thermal stability and surface morphologies of the modified silica were investigated. The modified silica fillers were blended during the curing of the epoxy resin with the polyamine hardener. The data regarding the chemical structure and thermal stability of the cured epoxy networks in the presence of modified silica elucidated the chemical bonding of amine groups on the silica surfaces cured with the oxirane epoxy resin. Moreover, the incorporation of modified silica in surfaces with epoxy networks improved their adhesion with steel surfaces and enhanced the mechanical, thermal and anticorrosion characteristics of the epoxy to protect steel surfaces against seawater.
Zn Doped α-Fe2O3: An Efficient Material for UV Driven Photocatalysis and Electrical Conductivity
Authors: Suman  , Chahal Surjeet , Kumar Ashok , Kumar Parmod
Published: April 2020

Zinc (Zn) doped hematite (α-Fe2O3) nanoparticles with varying concentrations (pure, 2%, 4% and 6%) were synthesized via sol-gel method. The influence of divalent Zn ions on structural, optical and dielectric behavior of hematite were studied. X-ray diffraction (XRD) pattern of synthesized samples were indexed to rhombohedral R3c space group of hematite with 14–21 nm crystallite size. The lattice parameter (a and c) values increase upto Zn 4% and decrease afterwards. The surface morphology of prepared nanoparticles were explored using transmission electron microscopy (TEM). The band gap measured from Tauc’s plot, using UV-Vis spectroscopy, showed reduction in its values upto Zn 4% and the reverse trend was obtained in higher concentrations. The dielectric properties of pure and Zn doped hematite were investigated at room temperature and followed the same trends as that of XRD parameters and band gap. Photocatalytic properties of nanoparticles were performed for hazardous Rose bengal dye and showed effective degradation in the presence of UV light. Hence, Zn2+ doped hematite can be considered as an efficient material for the potential applications in the domain of photocatalysis and also higher value of dielectric constant at room temperature makes them applicable in high energy storage devices.
PFW: Polygonal Fuzzy Weighted—An SVM Kernel for the Classification of Overlapping Data Groups
Authors: Shojae Chaeikar Saman , Manaf Azizah Abdul , Alarood Ala Abdulsalam , Zamani Mazdak
Published: April 2020

Support vector machines are supervised learning models which are capable of classifying data and measuring regression by means of a learning algorithm. If data are linearly separable, a conventional linear kernel is used to classify them. Otherwise, the data are normally first transformed from input space to feature space, and then they are classified. However, carrying out this transformation is not always practical, and the process itself increases the cost of training and prediction. To address these problems, this paper puts forward an SVM kernel, called polygonal fuzzy weighted or PFW, which effectively classifies data without space transformation, even if the groups in question are not linearly separable and have overlapping areas. This kernel is based on Gaussian data distribution, standard deviation, the three-sigma rule and a polygonal fuzzy membership function. A comparison of our PFW, radial basis function (RBF) and conventional linear kernels in identical experimental conditions shows that PFW produces a minimum of 26% higher classification accuracy compared with the linear kernel, and it outperforms the RBF kernel in two-thirds of class labels, by a minimum of 3%. Moreover, Since PFW runs within the original feature space, it involves no additional computational cost.
Study on the Influence of Social Capital on Farmers’ Participation in Rural Domestic Sewage Treatment in Nanjing, China
Authors: Zhang Rui , Zheng Huawei , Zhang Hui , Hu Feng
Published: April 2020

Rural domestic sewage treatment is not only an important part of the renovation of rural human settlements, but also a major measure to revitalize those areas. In the absence of extensive participation by farmers, it is difficult to achieve desired results. From the theoretical analysis of the influence of social capital on farmers’ participation, and based on the survey data of farmers in Nanjing, Jiangsu Province, this study used a logistic model to analyze the influence of social capital and personal, family, and awareness characteristics of farmers on their participation levels. Social capital plays a significant role in promoting farmers’ participation, and the contribution of its core variables is in the following order: social norms > social trust > social networks. Among the control variables, the need for domestic sewage treatment, participation in environmental training, educational level, and participation in a village cadre significantly enhance farmers’ participation levels. Consequently, promotion of rural domestic sewage treatment should include improvement of farmers’ social trust, social norms, and social networks, to enhance social capital. Publicity and education should be reinforced, and environmental training should be carried out to improve farmers’ awareness and sense of responsibility, leading them to active participation.
Raman Microspectroscopy of Garnets from S-Fibulae from the Archaeological Site Lajh (Slovenia)
Authors: Kos Saša , Dolenec Matej , Lux Judita , Dolenec Sabina
Published: April 2020

Garnets (19 pieces) of Late Antique S-fibulae from the archaeological site at Lajh-Kranj (Slovenia) were analysed with Raman microspectroscopy to obtain their mineral characteristic, including inclusion assemblage. Most garnets were determined as almandines Type I of pyralspite solid solution series; however, three garnets showed a higher Mg, Mn and Ca contents and were determined as almandines Type II. Most significant Raman bands were determined in the range of 169–173 cm−1 (T(X2+)), 346–352 cm−1 (R(SiO4)), 557–559 cm−1 (ν2), 633–637 cm−1 (ν4), 917–919 cm−1 (ν1), and 1042–1045 cm−1 (ν3). Shifting of certain Raman bands toward higher frequencies was the result of an increase of the Mg content in the garnet composition, which also indicates the presence of pyrope end member in solid garnet solutions. Inclusions of apatite, quartz, mica, magnetite, ilmenite, as well as inclusions with pleochroic or radiation halo and tension fissures (zircon), were found in most of the garnets. Rutile and sillimanite were found only in garnets with the highest pyrope content. Spherical inclusions were also observed in two garnets, which may indicate the presence of melt or gas residues. The determined inclusion assemblage indicates the formation of garnets during medium- to high-grade metamorphism of amphibolite or granulite facies. According to earlier investigations of the garnets from Late Antique jewellery, the investigated garnets are believed to originate from India.
The Use of Precise Survey Techniques to Find the Connection between Discontinuities and Surface Morphologic Features in the Laže Quarry in Slovenia
Authors: Lazar Aleš , Vižintin Goran , Beguš Tomaž , Vulić Milivoj
Published: April 2020

This paper addresses a stability evaluation of artificial slopes in a quarry located in Slovenia that was affected by a rockslide in March 2019. In order to ensure the safety of further production, measures were taken to restore the slopes. A stability assessment of the remaining parts of the quarry was conducted. To ensure quality spatial data, an upgraded study based on terrain mapping and aerial photogrammetric imaging using an unmanned aircraft was carried out, in addition to a traditional field survey of the quarry. So that the data were qualitatively useful, a digital terrain and discontinuity model was developed. Projections of the discontinuities occurring in the quarry and in the wider area were determined. The focus of the modeling was finding the main systems of discontinuities and projecting these systems onto the unexcavated parts of the quarry.
Magnetic Graphene-Based Sheets for Bacteria Capture and Destruction Using a High-Frequency Magnetic Field
Authors: Hardiansyah Andri , Yang Ming-Chien , Liao Hung-Liang , Cheng Yu-Wei , Destyorini Fredina , Irmawati Yuyun , Liu Chi-Ming , Yung Ming-Chi , Hsu Chuan-Chih , Liu Ting-Yu
Published: April 2020

Magnetic reduced graphene oxide (MRGO) sheets were prepared by embedding Fe3O4 nanoparticles on polyvinylpyrrolidone (PVP) and poly(diallyldimethylammonium chloride) (PDDA)-modified graphene oxide (GO) sheets for bacteria capture and destruction under a high-frequency magnetic field (HFMF). The characteristics of MRGO sheets were evaluated systematically by transmission electron microscopy (TEM), scanning electron microscopy (SEM), zeta potential measurement, X-ray diffraction (XRD), vibrating sample magnetometry (VSM), and X-ray photoelectron spectroscopy (XPS). TEM observation revealed that magnetic nanoparticles (8–10 nm) were dispersed on MRGO sheets. VSM measurements confirmed the superparamagnetic characteristics of the MRGO sheets. Under HFMF exposure, the temperature of MRGO sheets increased from 25 to 42 °C. Furthermore, we investigated the capability of MRGO sheets to capture and destroy bacteria (Staphylococcus aureus). The results show that MRGO sheets could capture bacteria and kill them through an HFMF, showing a great potential in magnetic separation and antibacterial application.
Tribological Behavior of Nanolubricants Based on Coated Magnetic Nanoparticles and Trimethylolpropane Trioleate Base Oil
Authors: Liñeira del Río José M. , López Enriqueta R. , González Gómez Manuel , Yáñez Vilar Susana , Piñeiro Yolanda , Rivas José , Gonçalves David E. P. , Seabra Jorge H. O. , Fernández Josefa
Published: April 2020

The main task of this work is to study the tribological performance of nanolubricants formed by trimethylolpropane trioleate (TMPTO) base oil with magnetic nanoparticles coated with oleic acid: Fe3O4 of two sizes 6.3 nm and 10 nm, and Nd alloy compound of 19 nm. Coated nanoparticles (NPs) were synthesized via chemical co-precipitation or thermal decomposition by adsorption with oleic acid in the same step. Three nanodispersions of TMPTO of 0.015 wt% of each NP were prepared, which were stable for at least 11 months. Two different types of tribological tests were carried out: pure sliding conditions and rolling conditions (5% slide to roll ratio). With the aim of analyzing the wear by means of the wear scar diameter (WSD), the wear track depth and the volume of the wear track produced after the first type of the tribological tests, a 3D optical profiler was used. The best tribological performance was found for the Nd alloy compound nanodispersion, with reductions of 29% and 67% in friction and WSD, respectively, in comparison with TMPTO. On the other hand, rolling conditions tests were utilized to study friction and film thickness of nanolubricants, determining that Fe3O4 (6.3 nm) nanolubricant reduces friction in comparison to TMPTO.
Bimetallic Core–Shell Nanoparticles of Gold and Silver via Bioinspired Polydopamine Layer as Surface-Enhanced Raman Spectroscopy (SERS) Platform
Authors: Yilmaz Asli , Yilmaz Mehmet
Published: April 2020

Despite numerous attempts to fabricate the core–shell nanoparticles, novel, simple, and low-cost approaches are still required to produce these efficient nanosystems. In this study, we propose the synthesis of bimetallic core–shell nanoparticles of gold (AuNP) and silver (AgNP) nanostructures via a bioinspired polydopamine (PDOP) layer and their employment as a surface-enhanced Raman spectroscopy (SERS) platform. Herein, the PDOP layer was used as an interface between nanostructures as well as stabilizing and reducing agents for the deposition of silver ions onto the AuNPs. UV-vis absorption spectra and electron microscope images confirmed the deposition of the silver ions and the formation of core–shell nanoparticles. SERS activity tests indicated that both the PDOP thickness and silver deposition time are the dominant parameters that determine the SERS performances of the proposed core–shell system. In comparison to bare AuNPs, more than three times higher SERS signal intensity was obtained with an enhancement factor of 3.5 × 105.
A Systematic Review of Studies Published between 2016 and 2019 on the Effectiveness and Efficacy of Pneumococcal Vaccination on Pneumonia and Invasive Pneumococcal Disease in an Elderly Population
Authors: Berild Jacob Dag , Winje Brita Askeland , Vestrheim Didrik Frimann , Slotved Hans-Christian , Valentiner-Branth Palle , Roth Adam , Storsäter Jann
Published: April 2020

Adult vaccination is high on the agenda in many countries. Two different vaccines are available for the prevention of pneumococcal disease in adults: a 23-valent polysaccharide vaccine (PPV23), and a 13-valent conjugated vaccine (PCV13). The objective of this review is to update the evidence base for vaccine efficacy and effectiveness of PPV23 and PCV13 against invasive pneumococcal disease and pneumonia among an unselected elderly population. We systematically searched for clinical trials and observational studies published between January 1 2016 and April 17 2019 in Pubmed, Embase, Cinahl, Web of Science, Epistemonikos and Cochrane databases. Risk of bias was assessed using Cochrane Risk of Bias tool for and the Newcastle–Ottawa Scale. Results were stratified by vaccine type and outcome. We identified nine studies on PCV13 and six on PPV23. No new randomized clinical trials were identified. Due to different outcomes, it was not possible to do a meta-analysis. New high-quality observational studies indicate protective vaccine effectiveness for both vaccines against vaccine type pneumonia. Our estimates for the protective vaccine efficacy and effectiveness (VE) of PPV23 on pneumonia and pneumococcal pneumonia overlap with results from previously published reviews. Some of the results indicate that the effectiveness of the PPV23 is best in younger age groups, and that it decreases over time.
Biofilm Production Ability, Virulence and Antimicrobial Resistance Genes in Staphylococcus aureus from Various Veterinary Hospitals
Authors: Chen Lin , Tang Zi-Yun , Cui Shi-Yun , Ma Zhen-Bao , Deng Hua , Kong Wei-Li , Yang Li-Wen , Lin Chao , Xiong Wen-Guang , Zeng Zhen-Ling
Published: April 2020

Staphylococcus aureus (S. aureus) is one of the most clinically important zoonotic pathogens, but an understanding of the prevalence, biofilm formulation ability, virulence, and antimicrobial resistance genes of S. aureus from veterinary hospitals is lacking. By characterizing S. aureus in different origins of veterinary hospitals in Guangzhou, China, in 2019, we identified with the presence of S. aureus in pets (17.1%), veterinarians (31.7%), airborne dust (19.1%), environmental surfaces (4.3%), and medical device surfaces (10.8%). Multilocus sequence typing (MLST) and Staphylococcus protein A (spa) typing analyses demonstrated methicillin-sensitive S. aureus (MSSA) ST398-t571, MSSA ST188-t189, and methicillin-resistant S. aureus (MRSA) ST59-t437 were the most prevalent lineage. S. aureus with similar pulsed-field gel electrophoresis (PFGE) types distributed widely in different kinds of samples. The crystal violet straining assays revealed 100% (3/3) of MRSA ST59 and 81.8% (9/11) of MSSA ST188 showed strong biofilm formulation ability, whereas other STs (ST1, ST5, ST7, ST15, ST88, ST398, ST3154 and ST5353) showed weak biofilm production ability. Polymerase chain reaction (PCR) confirmed the most prevalent leucocidin, staphylococcal enterotoxins, ica operon, and adhesion genes were lukD-lukE (49.0%), sec-sel (15.7%), icaA-icaB-icaC-icaR (100.0%), and fnbB-cidA-fib-ebps-eno (100.0%), respectively. Our study showed that the isolates with strong biofilm production ability had a higher prevalence in clfA, clfB, fnbA and sdrC genes compared to the isolates with weak biofilm production ability. Furthermore, 2 ST1-MRSA isolates with tst gene and 1 ST88-MSSA isolate with lukS/F-PV gene were detected. In conclusion, the clonal dissemination of S. aureus of different origins in veterinary hospitals may have occurred; the biofilm production capacity of S. aureus is strongly correlated with ST types; some adhesion genes such as clfA, clfB, fnbA, and sdrC may pose an influence on biofilm production ability and the emergence of lukS/F-PV and tst genes in S. aureus from veterinary hospitals should raise our vigilance.
PERBEDAAN KEMAMPUAN PEMECAHAN MASALAH MATEMATIKA SISWA YANG DIAJAR DENGAN MODEL KOOPERATIF TIPE NUMBERED HEAD TOGETHER (NHT) DAN STUDENT TEAMS ACHIEVEMENT DIVISION (STAD)
Authors: Tambunan Mardiah , Siahaan Sahat
Published: April 2020

Penelitian ini bertujuan untuk mengetahui perbedaan kemampuan pemcahan masalah matematika pada kelas yang diterapkan pembelajaran kooperatif NHT dan STAD. Kemampuan pemecahan masalah matematika ditinjau dari empat aspek diantaranya, pemahaman, perencanaan, penyelesaian, dan evaluasi. Sampel di pilih secara random dua kelas dari dua belas kelas. Kedua kelas tersebut akan diberikan perlakuan yang berbeda. Data yang digunakan untuk analisis data adalah data pretes (tes awal) dan data posttest (tes akhir). Setelah diuji data-data tersebut dinyatakan normbalitas dan homogenitas.  Hasil pengujian hipotesis dengan taraf signifikansi , dk = n1 + n2 – 2 = 74, dan ttabel = 1,9953  diperoleh thitung = 4,433 sehingga . Dengan demikian H0 ditolak yang berarti terdapat perbedaan kemampuan pemecahan masalah matematika siswa yang diajar dengan menggunakan model kooperatif tipe NHT dan dengan menggunakan model kooperatif tipe STAD pada materi aljabar di kelas VII SMP Pahlawan Nasional Medan T.A. 2011/2012
Identifikasi dan Recovery File JPEG dengan Metode Signature-Based Carving dalam Model Automata
Authors: Ardiansyah Ardiansyah , Hardi Nila , Gata Windu
Published: April 2020

Penggunaan format gambar JPEG semakin meningkat seiring dengan meningkatnya produksi foto digital yang dipicu oleh kemunculan smartphone dan perkembangan sosial media. Hal tersebut membuat file JPEG berperan penting dalam proses digital forensik, sehingga banyak metode identifikasi dan recovery file JPEG yang dikembangkan. Paper ini berusaha melihat proses data carving file JPEG dengan metode Signature-Based Carving, metode carving yang paling sederhana, dengan sebuah model diagram Finite State Automata, sebuah model algoritma dasar dalam teori komputasi.
Application and Analysis of Retail Inventory Using Data Mining Techniques
Authors: Uddin Adnan MD Imtiaz , Raz Redoyan , Ahmed Tanvir , Islam A. H. M Saiful
Published: April 2020

Data mining is one of the most essential tools for gathering information from different datasets in almost all recent industries. In this 21st-century, data mining gained attention because of its significance in decision making, and it has become a key component in various industries such as retail. Inventory management requires pre-planned goals and attention to detail, and prioritizing items that require less attention can be a waste of time and resources. Learning indications about customers’ shopping patterns by showing associations among various provides significant value in managing retail inventory. In the present research paper, popular data mining techniques have been applied and analyzed for multi-item inventory management in retail sales stores to show how data mining techniques can optimize and organize the retail inventory.
Pengaruh Ukuran Adsorben Kulit Pisang Kepok terhadap Penurunan Nilai Asam Lemak Bebas Minyak Goreng Bekas
Authors: Suryadi Joko , Widiastuti Endang , Ali Mohammad Idris Asyraf , Ali Zulfany
Published: April 2020

Penelitian ini bertujuan untuk mengukur tingkat perbaikan kualitas terhadap jelantah yang dapat dilakukan kulit pisang kepok. Minyak jelantah yang digunakan dalam penelitian ini diperoleh dari penjual gorengan dan didiamkan selama 24 jam sebelum diproses lebih lanjut. Metode adsorpsi yang akan dilakukan dalam penelitian ini adalah metode batch pada temperature 40 oC dengan waktu kontak pada 30 dan 60 menit. Kecepatan pengadukan diatur pada 500 rpm. Ukuran adsorben divariasikan pada 35, 60, dan 230 mesh. Karakterisasi yang dilakukan pada adsorben adalah kapasitas adsorpsi dengan variasi massa menggunakan metode iodin. Parameter kualitas jelantah adalah persen perubahan nilai asam lemak bebas sebelum dan sesudah perlakuan adsorpsi. Karakteristik kulit pisang sebagai adsorben dengan efisiensi terbesar ditunjukkan pada kulit pisang pada ukuran 230 mesh sebanyak 2 gram sebesar 73,38%. Persentase penurunan asam lemak bebas terbesar ditunjukkan pada kulit pisang pada ukuran 35 mesh dengan pengadukan selama 60 menit dengan nilai 8,57%.
FORMAL SCHOOLING AND THE PROCESS OF IDENTITY CONSTRUCTION: EXPERIENCES OF MALAYSIAN YOUTHS IN ‘BAD’ SCHOOLS
Authors: Mohamad Shah Dianna Suzieanna , Mohd Adnan Airil Haimi
Published: April 2020

In human lifespan development, identity construction is central within social and personal experiences, even more so for teenagers and young adults (youths) who are looking for their sense of self and own identity. The construction of identity involves the growth of a whole person and the development of a stable sense of self. At the same time, the process of identity construction causes some youths to become self-conscious about how others perceive them; this usually results in repeated self-discovery and identity experiment cycles. Their identities are thus constructed and reconstructed as they try out different role types in different settings, such as in schools. The focus of this research paper is to examine the experience of formal schooling and how it relates to the identity process of Malaysian youths. Employing qualitative face-to-face interviews, data were collected from six research participants from a private university in Selangor, Malaysia who were purposively selected for this empirical research. Three criteria for participant selection were used: That they have been in rural schools for most of their lives, the schools adopt a very didactic focus, and the schools have a limited number of highly trained and motivated teachers; in other words, they have experienced being in ‘bad’ schools. The research participants were selected from two different academic programs: Three undergraduate students from Bachelor in Teaching English as a Second Language (TESL) and another three from the Bachelor in Law program. Two research questions were posed. First, where does the experience of formal schooling figure in the identity construction of these youths? And second, what roles do the formal experience of schooling play in the lifespan identity development of these youths? Although not generalisable to all youths in Malaysia, the experiences of the participants contribute to advancing our knowledge of identity construction through the process of formal schooling.
موقف مدرسة مصطفى عبد الرازق من الخطاب الاستشراقي محمد عبد الهادي أبو ريدة أنموذجاً
Authors: عطية عادل سالم
Published: April 2020

يهدف البحث إلى تحليل منهج محمد عبد الهادي أبو ريدة في قراءة الخطاب الاستشراقي ودوافعه وأحكامه على تاريخ الفلسفة في الإسلام. وهو منهج يوجِّه أنظار الباحثين إلى أصالة التفكير الفلسفي الإسلامي، ورفض المركزية الأوروبية والأحكام المسبقة في دراسة الفلسفة الإسلامية؛ إذ إنَّها لا تتفق مع النسق المعرفي للعلوم الإسلامية.
FAKTOR YANG MEMPENGARUHI KEJADIAN STUNTING PADA BALITA USIA 12-59 BULAN DI WILAYAH KERJA PUSKESMAS CAMPALAGIAN
Authors: Nurisriani Najamuddin  , Reni Rahmadani  , Suriany
Published: April 2020

Background: Stunting problems in toddlers, which until now are still a special concern in the world because it can inhibit the physical and mental development of children. Stunting is a chronic malnutrition problem caused by a lack of nutrient intake over a long period of time due to food intake that is not in accordance with the nutritional needs of the body. Toddlers who experience stunting will cause increased risk and stunted growth and development of children. The method used in this study was observational analytic with a controud case design. Sampling using proportional random sampling technique, obtained 86 respondents in accordance with the inclusion criteria, data collection was done using questionnaire sheets and using KMS to observe birth weight in infants, height and weight of the last weighing at the time of the study with questionnaire filling. The collected data is then processed by using the Chi Square test with ? <0.05. The results of the statistical test showed that BBLR  (p = 0.005), Exclusive breastfeeding (p = 0.104), Mp-ASI (p = 0.121). The conclusion in this study is that BBLR affects the incidence of stunting, Exclusive breastfeeding and breastfeeding does not affect the incidence of stunting in children aged 12 to 59 months at the Campalagian Health Center in Polewali Mandar district.
CHROMNIUM PICLONAT EFFECTS IN DIET OF MALE RABBITS EXPOSED TO HEAT STRESS ON SOME PRODUCTIVE TRAITS AND BLOOD SERUM PARAMETERS
Authors: & Al-Saadi Hashem
Published: April 2020

current study was conducted to determine the effects of Chromium piclonat supplementation on some  productive  traits and serum parameters of male rabbit exposed to heat stress by used electric heaters  ,twenty four male rabbits were randomly divided into four groups 6 for each, first group put in normal suitable climate condition based diet without additional Chromium and kept as positive control group , while The other  three groups exposed to heat stress  , the basal diet was consisted of 0, 300 , and 500 ppb of Chromium piclonate  respectively as a feed additives . All rabbit received feed and water ad libitum, the results showed  that there were Increasing organic Cr supplementation 300 and 500 pbb  of two treated groups resulted in an increase in body weight compared with negative and positive control group , the  serum glucose and cortisone hormone concentrations of both treated groups were decrease, as dietary Cr level increased (P<0.05), but Cr supplementation did not affect total protein,  albumen and globulin. These data indicated that organic Cr supplementation increased some performance traits, particularly body weight production and decreased in glucose and cortisone hormone while there were not significant effect in the total of serum protein,  Albumin and globulin ,it can be concluded that adding chromium piclonat in dose 300,500pbb in diet of rabbits during  hot periods has a benefits to overcome deterioration in some performance traits  related to oxidative stress results from  heat stress.
Do Supply Chain Management Practices Influence Firm Performance?
Authors: Silva Catia Duarte , Sousa Paulo S.A. , Moreira Maria R.A. , Amaro Graça Maciel
Published: April 2020

Firms recognize that an assertive SCM could lead to an important competitive advantage in the business world. The purpose of this study is to capture the effect of supply chain management practices in the performance of firms, through a meta-analysis. It aims at highlighting which SCM practices that have a superior effect and their positive or negative impact on performance. Partnership with suppliers, process driven events, employee involvement, and customer satisfaction are the SCM practices that proved to have a positive impact in firm performance, according to the meta-analysis results. The findings from the research can help managers deciding on in which SCM practices concentrate their effort. It also allows making comparisons among different regions in terms of practices with a positive effect and how SCM practices evolves since first insights to now and if it changes throughout time. Concerning supply chain theories, this research sustains the hypotheses that SCM practices impact on some firm performance measures.
Estado de humor em esportes coletivos: estudo de caso das equipes de Itatiba
Authors: Tertuliano Ivan Wallan , Prado Vivian Loietes de Oliveira , Dorneles Sthefannie Postal , Montiel José Maria , Bartholomeu Daniel
Published: April 2020

O estudo teve o objetivo foi investigar os estados de humor de atletas de esportes coletivos, das equipes da cidade de Itatiba/SP, participantes dos jogos regionais de 2018. Assim, foi utilizada a Escala de Humor de Brunel (BRUMS), junto a 34 atletas, voluntários, do ambos os sexos, com idades entre 15 e 29 anos. Os participantes pertenciam a 3 equipes: Voleibol Masculino, Voleibol Feminino e Basquetebol Masculino. Os resultados demonstraram que no início da competição os atletas de todas as equipes apresentavam estado de humor positivo, já que o fator Vigor obteve os maiores escores, mas as atletas do Voleibol Feminino foram superiores nesse fator as demais equipes. Pode-se concluir que os atletas investigados apresentaram escores superiores ao fator Vigor, caracterizando a amostra com o perfil denominado de iceberg, perfil considerado ideal para o rendimento esportivo.
Cyberbullying among Normal and Attention Deficit Hyperactivity Disorder University Students (A Psychometric-Clinical Study)
Authors: Abdelrazek Mohamed M. , Eltantawy Mahmoud M.
Published: April 2020

The present study aimed to investigate cyberbullying among normal and attention deficit hyperactivity disorder (ADHD) university students based on some variables. Its population comprised (1312) students at Saudi universities and disability centers and covered a sample of (148) normal and ADHD students encountering cyberbullying. Two clinical case studies were conducted. The study adopted the descriptive and analytical method, as well as the clinical approach. It utilized the cyberbullying scale, interview form, and Thematic Apperception Test. Results revealed the proliferation of some cyberbullying types among normal and ADHD university students. The cultural nature of the community affected the type of cyberbullying. Furthermore, there were differences in cyberbullying between normal and ADHD university students in favor of the ADHD students and between males and females, favoring the males. Such differences were caused by psychological and cultural variables .
Psychometric Analysis of Economics Achievement Test Using Item Response Theory
Authors: Ezechukwu Roseline Ifeoma , Oguguo Basil Chinecherem, E. , Ene Catherine U. , Ugorji Clifford O.
Published: April 2020

This study determined the psychometric properties of the Economics Achievement Test (EAT) using Item Response Theory (IRT). Two popular IRT models namely, one-parameter logistics (1PL) and two-parameter logistics (2PL) models were utilized. The researcher adopted instrumentation research design. Four research questions and two hypotheses were formulated to guide the study. The population size is five thousand, three hundred and sixty-two (5,362) from thirty-seven (37) schools. The sample for the study was 1,180 senior secondary school students (SSS3) drawn using multi-stage sampling procedure. The 1,180 students were stratified according to gender which resulted to 885 females and 295 males. The instrument for the study consisted of 50 multiple-choice test items on the economics achievement test, developed by the researchers. Reliability and validity for each item and for the whole test were established according to the one-parameter and two-parameter logistic models. Research question one was answered using 1PLM, while research questions two and three were answered using 2PLM IRT model. Hypothesis one was tested using t-test analysis of difference between the difficulty parameters estimated using 1PLM and 2PLM while hypothesis two was tested using Chi-square. The finding of the study revealed significant difference between the item difficulties estimated using 1PLM and 2PLM. Also the observed scores of the testees on the test items fit the 1PL 2PL models.
Drilling Energy Correlates With Screw Insertion Torque, Screw Compression, and Pullout Strength: A Cadaver Study
Authors: Chen Michael J. , DeBaun Malcolm R. , Thio Timothy , Storaci Hunter , Gardner Michael J.
Published: April 2020

Introduction:

To determine whether drilling energy correlates with bone mineral density (BMD), maximum insertion torque (MIT), maximum screw compression, and pullout strength (POS).

Methods:

Ten cadaver tibias were used for testing. Unicortical pilot holes were drilled and the drilling energy measured. Drill site bone quality was determined with microcomputed tomography. Drill holes were randomly assigned to POS or MIT testing using 3.5-mm cortical screws engaging only the near cortex. Pearson correlation coefficients were calculated to determine the relationship between drilling energy, BMD, POS, MIT, and maximum screw compression.

Results:

Drilling energy was correlated with BMD (P < 0.001). Compared with BMD, drilling energy had a better correlation with MIT, maximum screw compression, and POS. Maximum screw compression also correlated with MIT (P = 0.012).

Conclusions:

Drilling energy better correlates with MIT, maximum screw compression, and POS compared with BMD in cadaver cortical bone. Dynamically measuring drilling energy may help inform the orthopaedic surgeon as to the quality of the bone before insertion of implants.