bluuebunny/crossref_metadata_2025 huggingface dataset:
The effect of integrative learning model and critical thinking ability toward students’ historical learning outcome in SMA Negeri 13 Bekasi
Authors: Wulandari Reni
Published: October 2019

Abstract: This study aims at determining the effect of learning model and critical thinking ability toward students’ historical learning outcome in State Senior High School 13 Bekasi. This study is quantitative research by using experiment method with treatment by level 2x2 design. The population of this study is all students of XI IIS class. While, the sample is chosen two classes, namely XI IIS 2 class and XI IIS 3 class with total of 72 students. The instruments used are multiple choice test to measure learning outcome and questionnaire to measure critical thinking ability. The results of this study indicated that: 1) students’ learning outcome by using integrative learning model is higher than using cooperative learning model, 2) there is an interaction effect between learning model and critical thinking ability, 3) students’ historical learning result using integrative learning model and having higher critical thinking ability is higher than using cooperative learning model and having higher critical thinking ability, (4) students’ historical learning outcome using integrative learning model and having low critical thinking ability is lower than using cooperative learning model and having low critical thinking ability. Pengaruh model pembelajaran integratif dan kemampuan berpikir kritis terhadap hasil belajar sejarah siswa smaAbstrak: Penelitian ini bertujuan untuk mengetahui pengaruh model pembelajaran dan kemampuan berpikir kritis terhadap hasil belajar sejarah siswa di SMA Negeri 13 Bekasi. Jenis penelitian yang digunakan adalah penelitian kuantitatif dengan menggunakan metode eksperimen desain treatment by level 2x2. Populasi terdiri dari seluruh siswa kelas XI IIS. Sampel terdiri dari dua kelas yaitu kelas XI IIS 2 dan XI IIS 3 dengan jumlah 72 siswa. Instrumen yang digunakan untuk hasil belajar adalah tes pilihan ganda dan yang digunakan untuk kemampuan berpikir kritis adalah kuesioner. Hasil penelitian ini menunjukkan bahwa: 1) hasil belajar siswa yang diberikan model pembelajaran integratif lebih tinggi dari siswa yang diberikan model pembelajaran kooperatif; 2) terdapat pengaruh interaksi antara model pembelajaran dan kemampuan berpikir kritis; 3) hasil belajar sejarah siswa yang diberikan model pembelajaran integratif dan memiliki kemampuan berpikir kritis tinggi, lebih tinggi dari siswa yang diberikan model pembelajaran kooperatif dan memiliki kemampuan berpikir kritis tinggi; 4) hasil belajar sejarah siswa yang diberikan model pembelajaran integratif dan memiliki kemampuan berpikir kritis rendah, lebih rendah dari siswa yang diberikan model pembelajaran kooperatif dan memiliki kemampuan berpikir kritis rendah.
Mapping the Evidence on the Effectiveness of Telemedicine Interventions in Diabetes, Dyslipidemia, and Hypertension: An Umbrella Review of Systematic Reviews and Meta-Analyses (Preprint)
Authors: Timpel Patrick , Oswald Sarah , Schwarz Peter E H , Harst Lorenz
Published: October 2019

BACKGROUND

Telemedicine is defined by three characteristics: (1) using information and communication technologies, (2) covering a geographical distance, and (3) involving professionals who deliver care directly to a patient or a group of patients. It is said to improve chronic care management and self-management in patients with chronic diseases. However, currently available guidelines for the care of patients with diabetes, hypertension, or dyslipidemia do not include evidence-based guidance on which components of telemedicine are most effective for which patient populations.

OBJECTIVE

The primary aim of this study was to identify, synthesize, and critically appraise evidence on the effectiveness of telemedicine solutions and their components on clinical outcomes in patients with diabetes, hypertension, or dyslipidemia.

METHODS

We conducted an umbrella review of high-level evidence, including systematic reviews and meta-analyses of randomized controlled trials. On the basis of predefined eligibility criteria, extensive automated and manual searches of the databases PubMed, EMBASE, and Cochrane Library were conducted. Two authors independently screened the studies, extracted data, and carried out the quality assessments. Extracted data were presented according to intervention components and patient characteristics using defined thresholds of clinical relevance. Overall certainty of outcomes was assessed using the Grading of Recommendations, Assessment, Development, and Evaluation (GRADE) tool.

RESULTS

Overall, 3564 references were identified, of which 46 records were included after applying eligibility criteria. The majority of included studies were published after 2015. Significant and clinically relevant reduction rates for glycated hemoglobin (HbA1c; ≤−0.5%) were found in patients with diabetes. Higher reduction rates were found for recently diagnosed patients and those with higher baseline HbA1c (>8%). Telemedicine was not found to have a significant and clinically meaningful impact on blood pressure. Only reviews or meta-analyses reporting lipid outcomes in patients with diabetes were found. GRADE assessment revealed that the overall quality of the evidence was low to very low.

CONCLUSIONS

The results of this umbrella review indicate that telemedicine has the potential to improve clinical outcomes in patients with diabetes. Although subgroup-specific effectiveness rates favoring certain intervention and population characteristics were found, the low GRADE ratings indicate that evidence can be considered as limited. Future updates of clinical care and practice guidelines should carefully assess the methodological quality of studies and the overall certainty of subgroup-specific outcomes before recommending telemedicine interventions for certain patient populations.
Developing a Management Guide (the DemPower App) for Couples Where One Partner Has Dementia: Nonrandomized Feasibility Study (Preprint)
Authors: Lasrado Reena , Bielsten Therese , Hann Mark , Schumm James , Reilly Siobhan Theresa , Davies Linda , Swarbrick Caroline , Dowlen Robyn , Keady John , Hellström Ingrid
Published: October 2019

BACKGROUND

Promoting the health and well-being of couples where one partner has dementia is an overlooked area of care practice. Most postdiagnostic services currently lack a couple-centered approach and have a limited focus on the couple relationship. To help address this situation, we developed a tablet-based self-management guide (DemPower) focused on helping couples enhance their well-being and relationship quality.

OBJECTIVE

The aim of this study is to investigate the feasibility and acceptability of the DemPower app.

METHODS

A nonrandomized feasibility design was used to evaluate the DemPower intervention over 3 months among couples where a partner had a diagnosis of dementia. The study recruited 25 couples in the United Kingdom and 19 couples in Sweden. Outcome measures were obtained at baseline and postintervention. The study process and interventions were evaluated at various stages.

RESULTS

The study was completed by 48% (21/44) of couples where one partner had dementia, of whom 86% (18/21) of couples accessed all parts of the DemPower app. Each couple spent an average of 8 hours (SD 3.35 hours) using the app during the study period. In total, 90% (19/21) of couples reported that all sections of DemPower were useful in addressing various aspects of daily life and helped to focus on how they interacted in their relationship. Of the 4 core subjects on which the DemPower app was structured, home and neighborhood received the highest number of visits. Couples used activity sections more often than the core subject pages. The perception of DemPower’s utility varied with each couple’s lived experience of dementia, geographic location, relationship dynamics, and opportunities for social interaction. A 5.2-point increase in the dementia quality of life score for people with dementia and a marginal increase in the Mutuality scale (+1.23 points) for caregiver spouses were found. Design and navigational challenges were reported in the DemPower app.

CONCLUSIONS

The findings suggest that the DemPower app is a useful resource for couples where one partner has dementia and that the implementation of the app requires the support of memory clinics to reach couples at early diagnosis.

CLINICALTRIAL

ISRCTN Registry ISRCTN10122979; http://www.isrctn.com/ISRCTN10122979
Digital HIV Care Navigation for Young People Living With HIV in San Francisco, California: Feasibility and Acceptability Study (Preprint)
Authors: Trujillo Dillon , Turner Caitlin , Le Victory , Wilson Erin C , Arayasirikul Sean
Published: October 2019

BACKGROUND

HIV continues to be a public health challenge adversely affecting youth and young adults, as they are the fastest-growing group of new HIV infections in the United States and the group with the poorest health outcomes among those living with HIV. HIV prevention science has turned to mobile health as a novel approach to reach and engage young people living with HIV (YPLWH) experiencing barriers to HIV care.

OBJECTIVE

This study aimed to assess the feasibility and acceptability of a text message–based HIV care navigation intervention for YPLWH in San Francisco. Health eNavigation is a 6-month text message–based HIV care navigation where YPLWH are connected to their own HIV care navigator through text messaging to improve engagement in HIV primary care. Digital HIV care navigation included delivery of the following through SMS text messaging: (1) HIV care navigation, (2) health promotion and education, (3) motivational interviewing, and (4) social support.

METHODS

We evaluated the feasibility and acceptability of a text message–based HIV care navigation intervention among YPLWH. We assessed feasibility using quantitative data for the overall sample (N=120) to describe participant text messaging activity during the intervention. Acceptability was assessed through semistructured, in-depth interviews with a subsample of 16 participants 12 months after enrollment. Interviews were audio-recorded, transcribed, and analyzed using grounded theory.

RESULTS

Overall, the text message–based HIV care navigation intervention was feasible and acceptable. The majority of participants exhibited medium or high levels of engagement (50/120 [41.7%] and 26/120 [21.7%], respectively). Of the majority of participants who were newly diagnosed with HIV, 63% (24/38) had medium to high engagement. Similarly, among those who were not newly diagnosed, 63% (52/82) had medium to high engagement. The majority of participants found that the intervention added value to their lives and improved their engagement in HIV care, medication adherence, and viral suppression.

CONCLUSIONS

Text message–based HIV care navigation is a potentially powerful tool that may help bridge the gaps for linkage and retention and improve overall engagement in HIV care for many YPLWH. Our results indicate that participation in text message–based HIV care navigation is both feasible and acceptable across pervasive structural barriers that would otherwise hinder intervention engagement.
Assessment of Aqueous Lithium-based Salt Solutions as Working Fluid for Absorption Chillers using Aspen Plus
Authors: Adornado Adonis P. , Soriano Allan N. , Bungay Vergel C.
Published: October 2019

Absorption chillers are a viable option for providing waste heat-powered coolingor refrigeration, thereby improving overall energy efficiency-less primary energy input,lower emissions, and cost savings. This study focuses on the assessment of aqueouslithium-based salt solutions as working fluid for absorption chiller in exploring thepossibility of developing new mixtures for absorption chillers to improve the performanceof the absorption refrigeration systems (ARSs). In this paper, the coefficient ofperformance (COP) of a single-effect absorption chiller using aqueous lithium-based saltsolutions (LiF-H2O, LiCl-H2O, LiBr-H2O, and LiI-H2O) as working fluid was assessed usingAspen Plus®. The simulation results obtained showed that the mass and energy were wellbalanced for all systems. Furthermore, a direct proportionality relationship between COPof absorption chillers and the van't Hoff factor, i of dissociated aqueous salt solutions wasobserved. The highest COP value is 0.8930 for LiI-H2O among others.
Packed Bed Biosorption of Lead and Copper Ions Using Sugarcane Bagasse
Authors: Duga Norwin Dale F , Imperial Pauline Edrickke A , Soriano Allan N , Nieva Aileen D
Published: October 2019

Bagasse, a waste material from sugarcane has been studied as a biosorbent for removing heavy metals, Pb2+ and Cu2+, in a continuous system using a packed bed column. This study was undertaken to determine the influence of varying the bed height and flow rate on the breakthrough and saturation time. Thomas, Adams-Bohart and Yoon-Nelson models were used to assess the effects of varying parameters and both Thomas and Yoon-Nelson models were found to be satisfactory to describe the column data obtained in the experiment. Moreover, lead ions are adsorbed more efficiently with an adsorption capacity of 4.54 mg/g compared to copper ions with 3.98 mg/g at the most feasible parameters having a flow rate of 100 mL/min and a bed height of 30 cm
Preliminary Study: Kinetics of Oil Extraction from Sandalwood by Microwave-assisted Hydrodistillation
Authors: Kusuma Heri Septya , Mahfud Mahfud
Published: October 2019

Sandalwood and its oil, is one of the oldest known perfume materials and has a long history (more than 4000 years) of use as mentioned in Sanskrit manuscripts. Sandalwood oil plays an important role as an export commodity in many countries and its widely used in the food, perfumery and pharmaceuticals industries. The aim of this study is to know and verify the kinetics and mechanism of microwave-assisted hydrodistillation of sandalwood based on a second-order model. In this study, microwave-assisted hydrodistillation is used to extract essential oils from sandalwood. The extraction was carried out in ten extraction cycles of 15 min to 2.5 hours. The initial extraction rate, the extraction capacity and the second-order extraction rate constant were calculated using the model. Kinetics of oil extraction from sandalwood by microwave-assisted hydrodistillation proved that the extraction process was based on the second-order extraction model as the experimentally done in three different steps. The initial extraction rate, h, was 0.0232 g L-1 min-1, the extraction capacity, CS, was 0.6015 g L-1, the second-order extraction rate constant, k, was 0.0642 L g-1 min-1 and coefficient of determination, R2, was 0.9597.
Role of Citric Acid Modification on Hydrodesulfurization of DBT and 4,6 DMDBT in the Presence of Pyridine Over CoMo/Al2O3
Authors: Sintarako Pawinee , Praserthdam Piyasan , Thammongkol Vivan , Pokacharoenwatjana Banpot , Yuanglamyai Watchara , Inthiwong Chattrapha
Published: October 2019

In this study, the effect of pyridine as a basic nitrogen compound on HDS activity of DBT and 4,6 DMDBT in treated diesel over modified CoMo/Al2O3 by citric acid has been investigated. It has been obviously found that the modification of CoMo/Al2O3 catalyst by citric acid can inhibit the influence of pyridine on HDS activity of DBT and 4,6 DMDBT. This can be explained that when citric acid was applied in the catalyst preparation, the increasing of total amount of acid sites and the enhancement of HDN activity play an important role in the tolerance of pyridine.
Stability and Emission Characteristics of Diesel-Ethanol-Coconut Methyl Ester Blends for the Diesel Engines
Authors: Ardiyati Tanti , Dugos Nathaniel P. , Roces Susan A. , Suzuki Masaaki , Kusnanto Kusnanto
Published: October 2019

The stability and emission characteristics of diesel-ethanol-coconut methyl ester (CME) blends were studied to determine the most suitable fuel blends to be applied in diesel engines. This is done in order to assess the potential of the blends as a substitute for commercially available diesel fuel used in diesel engine. The stability results of the blends using 100% and 99.5% ethanol purity showed that the fuel blends containing ethanol up to 10% and CME of 5% and greater exhibited high mutual solubility at any temperature range and were resistant to microbial growths after 3 months storage. Engine operations at low speed especially at idle-no load and using a bigger size engine lead to a minimum ignition delay and result in lower fuel consumption rate. The emission test results with the new- blended fuels showed a reduction in CO2 and increasing percentage by volume of CO2 compared to commercially available diesel. The blends could deliver an efficient combustion and could run efficiently since production of the CO2 gases is higher than that of CO. The blends of 80% diesel, 5% ethanol, 10% CME; and 80% diesel, 10% ethanol, 10% CME could reduce the smoke opacity compared to commercially available diesel.
Simulated Biosorption of Cd(II) and Cu(II) in Single and Binary Metal Systems by Water Hyacinth (Eichhornia crassipes) using Aspen Adsorption
Authors: Adornado Adonis P. , Soriano Allan N. , Orfiana Omar Nassif , Pangon Mark Brandon J. , Nieva Aileen D.
Published: October 2019

Biosorption is becoming an attractive alternative for the removal of heavy metal from contaminated wastewaters since it offers low capital and operating costs. It has a great potential on heavy metal decontamination and the possibility of metal recovery. The study evaluated the performance of water hyacinth (Eichhornia crassipes) in a fixed bed column on sequestering heavy metals present in wastewaters. Column breakthrough curves at varying parameters were evaluated. The study used Aspen Adsorption® to simulate the biosorption process. Analysis of breakthrough curves for the single metal system shows that increasing both influent flow rate and initial metal concentration reduces the metal uptake of the column, while increasing bed height enhances the metal uptake of the column. Presence of both Cd(II) and Cu(II) in the system promotes competitive sorption processes. Analysis of the breakthrough curves for the binary metal system showed that copper ions adsorbed to the adsorbent are replaced by cadmium ions when the maximum capacity of the column is reached. This leads to the outlet concentration of Cu(II) exceeding its initial concentration. This phenomenon shows that Cd(II) has more affinity with E. crassipes than Cu(II).
Fabrication of Mesoporous Titanium Dioxide Assisted by Resorcinol/Formaldehyde Gel
Authors: Thovicha Mananya , Pavarajarn Varong
Published: October 2019

Mesoporous structures of materials have attracted considerable attention recently because of their potential in a variety of applications. In this work, resorcinol/formaldehyde (RF) gel was used as a template for the synthesis of mesoporous titania, which is in great interest in catalysis, photocatalysis, gas sensor and photovoltaic applications. RF-gel was prepared by the sol-gel polycondensation of resorcinol (R) and formaldehyde (F). Titanium tetraisopropoxide (TTIP) was used as precursor for titania. However, direct incorporation of TTIP into RF-gel was limited by a spontaneous reaction between TTIP and RF gel, which consequently resulted in rapid solidification of the gel. Titania sol was firstly prepared from TTIP via sol-gel process. After certain period of aging time, the titania sol was added into RF mixture, which had been aged for predetermined period of time as well. After that, the mixture was further aged for another 36 hours before being dried at 80°C. Finally, the dried gel was calcined at 500°C for 4 hours to remove the RF template. The obtained titania powders were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), surface area measurement via nitrogen adsorption, and Fourier transform infrared spectroscopy (FTIR). The specific surface area of the samples was in the range of 30-33 m2/g. and the average diameter of about 8.8-37.7 nm. It was found that the rate of addition for titania sol into the RF-gel had influence on the phase of the final product. The increased rate favored the formation of titania in rutile phase.
Electrochemical Behaviour Of Ferrocene/Ferricinium Redox System In Pure And CO2 Saturated [C6MIM][PF6]
Authors: Chanfreau Sebastien , He Liang-Nian , Yu Bing
Published: October 2019

The electrochemical behaviour of ferrocene has been studied in green solvent combining pure ionic liquid and CO2. Experimental results were achieved for the Fc/Fc+ (ferrocene/ferricinium ion) oxidation/reduction in pure and CO2 saturated 1-hexyl-3-methylimidazolium hexafluorophosphate ([C6MIM][PF6]) over the temperature range from 298.15 K to 323.15 K. Peak shaped voltammograms were obtained and usual electrochemical parameters were calculated in order to classify electron process at the electrode. Diffusion coefficients of electroactive species were determined in the order of 10-11 m2 s-1 using the Randles–Ševcík relationship. Mass transport was also favoured by both increases in temperature and dilution of CO2 in the media.
Synthesis of Spherical Silica by Sol-Gel Method and Its Application as Catalyst Support
Authors: Leksomboon Anirut , Jongsomjit Bunjerd
Published: October 2019

In this present study, the spherical silica support was synthesized from tetraethyloxysilane (TEOS), water, sodium hydroxide, ethylene glycol and n-dodecyltrimethyl ammonium bromide (C12TMABr). The particle size was controlled by variation of the ethylene glycol co-solvent weight ratio of a sol-gel method preparation in the range of 0.10 to 0.50. In addition, the particle size apparently increases with high weight ratio of co-solvent, but the particle size distribution was broader. The standard deviation of particle diameter is large when the co-solvent weight ratio is more than 0.35 and less than 0.15. However, the specific surface area was similar for all weight ratios ranging from 1000 to 1300 m2/g. The synthesized silica was spherical and has high specific surface area. The cobalt was impregnated onto the obtained silica to produce the cobalt catalyst used for CO2 hydrogenation.</
Photodegradation of Chlordane in Soil and Water Matrix Using Induced UV and Solar Light
Authors: Jr Alexander C. Sioson, , Gallardo Dr. Susan M.
Published: October 2019

The photodegradation of chlordane in soil and water matrix using induced ultraviolet (UV) radiation and solar light was evaluated in this study. A batch photolytic reactor equipped with a low-pressure mercury lamp (17 W) sterilight ultraviolet (UV) lamp with a supplied wavelength of 254nm was used in the photodegradation experiments. The pesticide’s initial concentration in water was varied using three different concentrations (0.80, 2.60, and 8.0 mg/L) and soil samples were prepared at three different dosages (0.20, 2.0, and 4.0 mg/kg). At preferred time intervals, samples were withdrawn from the reactor. The pH and temperature of the samples were continuously monitored. Samples were extracted using solid-phase extraction (SPE) and the degradation of components was verified using a GC-ECD setup. Solar experiments were conducted during the months of April and May (140 33.971’N, 1200 59.515’E); with a mean sunlight intensity of 85,187.5 lux. Results of the photodegradation experiments using the batch photolytic reactor showed an average of 91.65% degradation of the chlordane pesticide dissolved in water after hours of exposure to UV light. High degradation efficiencies were achieved at higher chlordane initial concentrations. For solar photodegradation experiments, an average of 71.59% degradation was achieved. Photodegradation in soil showed an average of 62.54% degradation of the compound. As such, percentage degradation increases as the initial concentration of the pollutant increases. Further, solar photodegradation experiments in soil samples showed an approximate 56.35% degradation of the compound throughout the duration of the experiment. Chloride-ion analysis using high-performance liquid chromatography (HPLC) equipment was conducted at chlordane aqueous solution. At higher chlordane concentrations, higher chloride ion concentrations in the solution were achieved. As such, more chloride ions detached themselves from the parent compound every two hours of sampling time and soon reached an almost steady state concentration at a maximum exposure time of eight hours.
Sludge Composting: A Case Study on Palm Oil Mill Sludge (POms)
Authors: Zahrim A. Y. , Rakmi A. R. , Kalil M. S.
Published: October 2019

Current disposal technology for palm oil mill sludge (POMS) creates problems such as sludge flooding insects, and bad odor mainly during the rain season. This study we present in-vessel composting system as an alternative process for disposal of POMS. Maximum temperature achieved for reactor was about 400C. It can be verified that the composting process followed first order kinetic equation with degradation rate k = 0.014 day-1 with maximum degradation rate of 51%. POMS compost has potential to improve performance of C. citratus growth in sandy soil that usually lacks nutrients and has poor soil structure.
Phase Equilibrium Study in Supercritical Fluid Extraction of Ethanol to Octane	Mixture Using CO2
Authors: Davarnejad R. , Kassim K. M. , Zainal A. , Sata Suhairi A.
Published: October 2019

Solubility data was measured for carbon dioxide with ethanol and octane using a phase equilibrium loading re-circulating high-pressure type apparatus at a pressure up to 100.75 bar and a temperature of 348.15K for ethanol and octane mixture involved with 25% ethanol and 75% octane. Experimental data was compared with the calculated regular solution theory data. A procedure is employed to each phase by applying activity coefficient expressions based on regular solution theory. Calculations along these lines are described and the physical bases for applying this method under the relevant conditions are discussed. The regular solution theory approach has been found to be encouraging for the prediction of phase equilibria solubilities though the interaction parameters must be regarded as pressure dependent.
Simulation of Ethyl Tert-Butyl Ether Production from Tert-Butyl Alcohol and Ethanol in Reactive Distillation
Authors: Assabumrungrat Suttichai , Pavarajarn Varong , Wongwattanasate Darin , Praserthdam Piyasan
Published: October 2019

Reactive distillation was applied for the synthesis of ethyl tert-butyl ether (ETBE) from a liquid-phase reaction between tert-butyl alcohol (TBA) and ethanol (EtOH) catalyzed by commercial ~-zeolite catalyst with Si/AI ratio of 55. The major side reaction of this system was the dehydration of TBA to isobutene (lB). From the present researchers' previous work, it was found that B-zeolite was superior to commercial Amberlyst-15 catalyst in reaction selectivity. The kinetic parameters for the reactions, which were determined using a semibatch reactor operated at various temperatures, were used for simulation in Aspen Plus TN program. Various operating parameters, such as heat duty, molar ratio of Hz0: EtOH, and refluxratio, were investigatedfor their effectson reactive distillation performance. Keywords: ,B-zeolite,ethyl tert-butyl ether (ETBE) synthesis, and reactive distillation.
Reduction of NOx Emission from Gas TURBINE COMBUSTOR Applying Fuel-Staged Combustion
Authors: Nazri Mohammad , Jaafar Mohd.
Published: October 2019

A two-stage lean/lean gas turbine combustor was developed with low NOx characteristics in each stage using a small radial swirler of 40-mm outlet diameter in the pilot stage. Both flame tubes were arranged in series with the smaller combustor (76 mm inside diameter) as the pilot stage and the larger combustor (140 mm inside diameter) as the main stage. The pilot stage was fuelled via vane passage fuel injector, while the main stage was fuelled around the wall of the exit plane of the pilot stage, using wall fuel injectors. Low NOx emissions were obtained when using fuel staging for methane fuel, as low as 6 ppm. A NO. reduction of more than 40 % was obtained at equivalence ratio of near 0.7, when using fuel staging compared to the non-fuel-staging test. Tests were conducted using methane as fuel. This was achieved at very small increase in carbon monoxide emissions especially near the rich region and with almost no increase at all in the unburned hydrocarbon emissions at the same equivalence ratio.Keywords: NOx emissions, fuel staging, carbon monoxide, swirler.
A Review on Fuel Cell as Advanced Power Source
Authors: Kamarudin S. K. , Daud W.R. W. , Ayub M. S. , Mohammad A. W. , Lyuke S. E.
Published: October 2019

Fuel cells are making headlines across the globe in almost all arenas of power production. While the technology for these electrochemical power plants was invented around 1839 and has been in use for nearly 150 years, it is only recently that fuel cells have gained popular recognition and reckoned for serious consideration as a power zone for the future. Despite their relatively new arrival on the popular scene, fuel cells have already found their way into pre-commercial testing in domestic, commercial, industrial and mobile applications. Fuel cells convert chemical energy of a fuel gas directly into electrical work, and are efficient and environmentally clean, since no combustion is involved. Fuel cells are presently under development for a variety of generation application in response to the critical need for a cleaner energy technology. The use of fuel cell systems has been strongly promoted in Japan and the United States for medium-scale co-generation plants. Nowadays, this interest has been extended to the smaller scale, in particular at the residential area level. All fuel cells currently being developed for near term use in electric vehicles require hydrogen as a fuel. At the same time, increased interest has arisen for the application of fuel cell systems to automotive propulsion, although there is no clear option on the direct use of hydrogen stored on board or the installation of hydrogen plant on board as of this time. This paper outlines the acute global population growth and the growing need and use of energy and its component as well as its environmental impact. In particular, this paper reviews the existing or emerging fuel cells technologies, limitations, and their benefits in connection with energy, environment and sustainable development relationship. In addition, this paper also explores fuel sources and the various types of fuel cells as well as their applications.
Use of the Taguchi Design of Experiments to Optimize the Parameters of Cleaning Machines for Sensitive Plastic Products
Authors: Celestino Sherwin , Auresenla Joseph
Published: October 2019

The Taguchi Design of Experiments (DOE), an optimization technique, was used to establish stabilized operating parameter settings for an ultrasonic cleaning machine for a new and very dirt sensitive plastic product referred to as type A plastic produced in a company in the Philippines. The optimization process is done in actual industrial setting. Taguchi DOE defined quality as minimum variation around the target specification of a product. The matrix used for the project is the La 27 orthogonal array wherein the experiment is comprised of eight runs with seven maximum possible factors at two levels. After each experimental run, the percentage ejection rate was monitored as the measurable characteristic of the finished product. Since rejection rate was the parameter used, the ultimate value closer to zero is better (the smaller the better). Confirmation runs showed that the percentage of rejection rate has improved from 62% to 17% when the established optimized machine parameters were used. Moreover, production yield has increased from 75% to more than 90% for product type A.
Peran Interaksi Guru-Siswa dan Gaya Belajar Siswa terhadap Disposisi Berpikir Kritis dalam Pembelajaran Fisika
Authors: Galih Primadhani Setyaning , Alsa Asmadi
Published: October 2019

This study aimed to empirically determine the role of teacher-student interaction and students’ learning styles in students’ disposition toward critical thinking in physics subject. Research participants were high school students of grade XI majoring in natural science. Sampling in this study was done using convenience sampling with sample size of 67 students (25 males and 42 females). Data collection method used in this study was survey using Disposition toward Critical Thinking in Physics Subject Scale, Teacher-student Interaction in Physics Subject Scale, and Learning Styles in Physics Subject Scale. Analysis of covariance with one covariate showed 1) there was a correlation between teacher-student interaction and students’ disposition toward critical thinking in physics subject (F = 37.199; ƞ2p = 0.375; p < 0.01) and 2) there was difference of disposition toward critical thinking in physics subjects between student with diverging, assimilating, accommodating, and converging learning styles (F = 6.870; ƞ2p = 0.249; p < 0.01). Post-hoc test was also done to further analyze the data. The findings are going to help improving quality of learning especially in the subject being studied by fostering wholesome teacher-student interaction and accommodating students’ learning styles.
Основные направления модернизации инженерного образования в сфере ИКТ
Authors: Попов В. , Преснов А. , Студянникова М. , Цветкова К.
Published: October 2019

Рассматриваются основные направления модернизации инженерного образования в сфере ИКТ в современной России. Показаны способы и направления модернизации инженерного образования в сфере инфокоммуникационных технологий.
MWC 19 Barcelona: умная связь под флагом 5G
Authors: Попов С. , Набоких Л.
Published: October 2019

Состоявшиеся 25–28 февраля уже 14-й год подряд в пригороде столицы Каталонии конгресс и выставка MWC Barcelona остаются главными глобальными событиями мира телекоммуникаций. В этом году поменялся слоган конгресса, он стал звучать: Welcome to the era of intellengent connectivity – "Добро пожаловать в эпоху умной связи".
Алгоритм аутентификации и формирования разовых ключей в имитаторе лабораторного стенда объединенной сети ПД специального назначения
Authors: Басараб М. , Бельфер Р. , Кравцов А. , Никулина Т.
Published: October 2019

Приведены алгоритмы аутентификации и формирования разовых ключей, предназначенных для обеспечения канального сквозного шифрования и целостности сообщений в имитаторе сети ПД категории специального назначения. При этом учитываются особенности объединенной структуры сети, включающей частные изолированные сети разных государственных ведомств, а также возможность предоставления соединений определенным оконечным пунктам частных сетей.
РАЗВИТИЕ ВОЛОКОННО-ОПТИЧЕСКИХ ИНФОРМАЦИОННЫХ СЕТЕЙ DWDM DCI
Authors: Конышев В. , Наний О. , Трещиков В.
Published: October 2019

Волоконно-оптические сети связи с плотным спектральным мультиплексированием (DWDM-сети), соединяющие центры обработки данных (Data Centre Interconnect – DCI), бурно развиваются в современном цифровом мире, поскольку растет число и размеры самих ЦОДов. При этом в глобальном цифровом информационном пространстве критически важной задачей является доступ к данным, хранимым и обрабатываемым в дата-центрах, которые, помимо взаимодействия с потребителями информации, должны общаться друг с другом, обмениваться данными и контентом, а также создавать резервные копии и резервировать данные.
ПЕРВЫЙ ПОЛЕВОЙ АНАЛИЗАТОР СПЕКТРА ДЛЯ ТЕСТИРОВАНИЯ СЕТЕЙ 5G
Authors: Байбаков П.
Published: October 2019

Прибор FieldFox серии B стал первым полевым анализатором спектра, который поддерживает полосу демодуляции и анализа спектра в режиме реального времени 100 МГц.
Сравнительные испытания концевых твердосплавных фрез.
Authors: Андреев В. , Молодык С. , Минайлов С. , Миненко Я. , Подольский М. , Негинский Е.
Published: October 2019

Приведены результаты испытаний концевых твердосплавных фрез, изготовленных из твердосплавных стержней различных фирм-изготовителей.
Диагностика технического состояния производственного оборудования.
Authors: Чуранов С. , Туманов А. , Каткова А.
Published: October 2019

Рассмотрена методология контроля технического состояния узлов технологического оборудования на базе системы мониторинга промышленного оборудования «Диспетчер». Описаны основные методы обследования технического состояния механических узлов и деталей, анализа информации. приведены примеры формируемых отчетов.
ПОСТПРОЦЕССОРЫ И РЕЗУЛЬТАТ!
Authors: Зинченко Д.
Published: October 2019

Рассмотрены основные параметры, учитываемые при разработке постпроцессоров, технологические особенности, учитываемые при разработке, приведено обоснование стоимости разработки постпроцессора. Проиллюстрированы методы повышения производительности при программировании станков с ЧПУ и более полного использования возможностей конкретного станка за счет использования оптимального постпроцессора.
¿Porque la participación ciudadana? Fundamentación en la teoría general del derecho, como fuente material del derecho
Authors: Montenegro Stoianoff Victor Enrique
Published: October 2019

 

Este articulo continúa respondiendo las indagaciones hechas en el articulo con referato porque la participación ciudadana publicado en la revista Cum Laude, UNNE Derecho, -como nos vimos obligados a mejorar el anterior optamos por diferenciarlo numéricamente como 1.5-. En el articulo anterior respondimos a la pregunta ¿porque la participación ciudadana?, diciendo que la misma es la razón de ser del derecho, la lucha del interés humano, su génesis, y en el transcurso argumentativo también decíamos el ¿para que de la participación ciudadana?, la obtención o conservación del derecho, es decir, la ley positiva vigente que nos reconoce y garantiza el interés deseado

 
 
La limitación a las reelecciones provinciales, impuesta por la Corte Suprema de Justicia de la Nación Argentina, ¿supone una violación a la autonomía provincial?
Authors: Basaure Miranda Isaac Marcelo
Published: October 2019

El presente trabajo tiene como objetivo determinar si la Corte
Suprema de Justicia de la Nación Argentina, al prohibir las rerreelecciones de los gobernadores Sergio Casas (La Rioja) y Alberto Weretilneck (Río Negro), en sus sentencias: “Unión Cívica Radical de la Provincia de La Rioja y otro c/La Rioja, Provincia de s/amparo” y “Frente para la Victoria – Distrito Río Negro y otros c/Río Negro, Provincia de s/amparo”, ambas emitidas el día 22 de marzo de 2019, violentó, o no, la autonomía provincial consagrada en el art. 121 de la Constitución Nacional.
El arbitraje societario en el Derecho nicaragüense
Authors: Robleto Arana Cristian Alberto
Published: October 2019

El acuerdo de arbitraje en materia societaria también se ha
denominado como intrasocietario, para resolver conflictosque puedan surgir entre
socios, entre socios y la sociedad, entre la sociedad y sus órganos. Este acuerdo
produce efectos desde el punto de vista de los sujetos y el objeto de la
controversia que se regula en el mismo. La aplicabilidad del arbitraje recae en la
libre disposición conforme a derecho y con base a la autonomía privada de los
socios. Se puede afirmar que el sistema nicaragüense no establece un límite de
relaciones que se puedan someter a arbitraje societario; sin embargo, pueden
surgir de la propia naturaleza de la materia y extensión del acuerdo. El laudo que
se emite surte efecto como sentencia judicial. Se recomienda que sea un arbitraje
de derecho porque lo que se discute son materias esencialmente normativas, sin
que el criterio de equidad deje mucho margen de decisión, aunque la ley admite
que pueda ser de equidad.
Editorial
Authors: López Bolaños Alejandro César
Published: October 2019

El mapa político latinoamericano ha cambiado su posición hacia la izquierda registrada en los primeros años del siglo XXI y transita a la adopción de gobiernos conservadores y con tintes de derechización extrema. Los alcances registrados por las políticas públicas diferentes al neoliberalismo se resquebrajan y dan paso a una nueva embestida de conservadurismo, atacando a las ideas contrarias al dogma neoliberal y peor aún, se restringen las libertades individuales con un discurso que reivindica el pensamiento único, y una falsa escala de valores morales que no es más que la creencia y la razón de una facción que ha tomado el control de los gobiernos. Desde esta posición tratan de imponer sobre la sociedad su visión, que no es más que la argumentación poco científica de un conjunto de dogmas sustentados en el racismo y la destrucción de la figura del pensar y actuar diferente a lo que su creencia refiere.
En algunos casos, este viraje conservador es el resultado de procesos electorales, en otros, es la consecuencia directa de los denominados “golpes de Estado blandos”; en todos los cambios políticos hacia gobiernos de tipo conservador se registra una constante, la imposición que el capital foráneo y privado requiere para retomar el control de los procesos de acumulación y orientarlos hacia su concentración, desestimado la redistribución de los recursos en beneficio de las sociedades latinoamericanas, aspecto que caracterizaba a las políticas sociales de los llamados gobiernos progresistas de América Latina.
El agotamiento del ciclo progresista: el caso uruguayo
Authors: Elías Antonio
Published: October 2019

Los gobiernos progresistas del Frente Amplio (FA) han logrado mejoras en el bienestar de la población, sin embargo, no pudieron resolver los problemas distributivos al momento de generar riqueza, y redistributivos porque no se tomaron medidas contra la riqueza acumulada. Su objetivo fundamental ha sido captar Inversión Extranjera Directa (IED) como motor de desarrollo y para ello aceptaron las reglas que imponen los Tratados Bilaterales de Inversión y las empresas transnacionales, reafirmando así las instituciones políticas y económicas del capital.

La caída de los precios de las materias primas y el retraimiento de la entrada de capitales afecta económicamente y políticamente al FA. Crece el déficit fiscal, la deuda externa, se devalúa la moneda y se pierden empleos. El gobierno ya no cuenta con recursos para desarrollar las políticas de conciliaciones de clase que le dieron estabilidad política y social en los primeros diez años y enfrenta una agudización de los conflictos. En ese marco se ha reducido el apoyo popular y es previsible un retroceso electoral, que se explicaría, entre otros aspectos, porque las mejoras económicas no estuvieron acompañadas de la formación ideológica necesaria para elevar los niveles de conciencia y organización para defender los logros alcanzados y enfrentar la ofensiva del capital.
Límites y desafíos históricos del progresismo en América Latina: la experiencia del Ecuador
Authors: Arauz Andrés
Published: October 2019

El progresismo del Ecuador enfrentó limitaciones de partida, vinculados al contexto global y regional. Desde un inicio buscó superar estas limitantes mediante políticas y acciones audaces a nivel nacional –soberanía– y a nivel regional integración–. Se caracteriza el orden económico global imperante, se describen las limitaciones de partida específicas para el progresismo del Ecuador, –la carrera económica hacia abajo vigente en la Subregión–, se detallan un grupo de medidas que se llevaron a cabo en términos de soberanía e integración, se exponen un cúmulo de limitaciones de carácter externo que se encontraron a lo largo de los procesos progresistas de Nuestra América –como la guerra económica y la guerra de la información–, se presentan una serie de errores comunes a estos procesos –especialmente a nivel de hegemonía–, y se examinan los desafíos venideros. Instancias como el Foro de Sao Paulo deben saltar a ser un instrumento político regional, con estructura orgánica regional, un frente progresista latinoamericano.
The Barriers in Implementing Electronic Prescribing in The Health Care: a Systematic Review
Authors: Leawaty Leawaty , Wibowo Adik
Published: October 2019

Medication error remain extremely common, and the health care system can do much more to prevent it. Electronic prescribing is increasingly being viewed by health care stakeholders as an important step toward improved medication safety, better management of medication costs, increased practice efficiency, and improved health care quality. However, the adoption of e-prescribing has been difficult to attain owing to numerous barriers throughout the industry. Even with all the benefits of e-prescribing, many providers and pharmacists remained hesitant about completely adopting an e-prescribing system. The main purpose of this study was to explore and to assess the barriers of electronic prescribing implementation. The methodology for this study followed the basic principles of a systematic review with PRISMA methode retrieved from online database PubMed using a keyword “barriers” OR “obstacles” AND “electronic prescribing” OR “electronic prescription” AND “implementation”. Finally 6 documents were selected by full text inclucion and assessed for eligibility. The result of the study are  inefficiency, the low uptake of the physicians, the cost of implementing the electronic prescription, system errors and the privacy and legacy. The conclusion from the studies should that electronic prescribing implementation barriers those we divided into 2 groups : the user factors and the system factors of the electronic prescription. Vendors or the consultants to facilitate more adequately the adoption of e-prescribing by giving the physicians the free trial and provide evaluation and improvement according to the physicians' needs for the features in the e-prescription.
Pharmacognostic Study of Leaves of Kigelia pinnata (Lam) Benth
Authors: Fatima Sumia , Lokare P.D.
Published: October 2019

The  Kigelia pinnata (Lam) Benth is a species of the Bignoniaceae family commonly known as Kigelia africana is locally known as waghul phul.  The adult sausage tree has spectabular fruits these can weigh several kilogram hence the tree English common name worsboom.  Wherever the trees grows it is usually evergreen especially places where rainfall occurs throughout the year but deciduous in places of long dry season. Kigelia pinnata is renowned for its traditional application as anti-inflammatory, anti-diabetic, anti-oxidant, anti –microbial, and anti-cancer effects.  It contains chemical constituent like kigenol, kigelinone7, kigenol12, iso-kigenolls. In the present work pharmacognostic studies are carried out to investigate its medicinal properties.  The study consists of macroscopic character of the plant Kigelia pinnata physico-chemical parameters like total ash, acid insoluble ash, thin layer chromatography etc. 

Keywords-  Kigelia pinnata,  pharmacognostic studies,  total ash, acid insoluble ash, thin layer chromatography
Topical Anti-inflammatory evaluation of new hydrazone: 4-chloro-3-nitrobenzylidene) isonicotinohydrazide
Authors: Mokhnache Kamel , Karbab Ahlem , Madoui Soraya , Khither Hanane , Soltani EL-Khamsa , Charef Noureddine , Arrar Lekhmici
Published: October 2019

The anti-inflammatory effects of the investigated compounds; Isoniazid, hydrazone, and Indomethacin were evaluated in this study. The experiment was performed using xylene induced topical ear edema method in mice model, at the dose of (0.5 mg/ear). Results showed that the compounds; Isoniazid, hydrazone, and Indomethacin exerted 85, 90 and 89% of inhibition percentages, respectively. The effect of hydrazone was statistically similar to the effect of indomethacin which is a standard anti-inflammatory drug.

Keywords: inflammation, hydrazone, ear edema, topical.