bluuebunny/crossref_metadata_2025 huggingface dataset:
An application of nurses’ professional self-concept and work productivity in one hospital in Padang, Indonesia
Authors: Arif Y , Sasmita F N , Anggraini S D
Published: March 2020

Nurses’ professional self-concept at the inpatient rooms of Dr. M. Djamil Hospital, Padang shows results that not yet optimal, as there are still nurses who have an inferior leadership or unfavourable attitudes. This condition can give negative effects on work productivity of nursing associates in the inpatient rooms. The purpose of this research was to determine the relationship between professional self-concept of nurses and the work productivity of nursing associates at Dr. M. Djamil Hospital, Padang in 2018. The research design was analytical descriptive with cross-sectional study approach. The samples were168 nursing associates at the hospital, and the sampling was based on proportional random sampling. Based on the results of this research, the good work productivity of nursing associates was 71%, and the good professional self-concept of nurses was 78%. There was a relationship between nurses’ self-concept professional and work productivity of nursing associates at Dr. M. Djamil Hospital, Padang. The researchers suggest that service institutions should improve nurses’ professional self-concept by managing training activities on managerial and caring.
Assessing medical students’ pharmacological therapy ability through a mobile application
Authors: Indriyanti R A , Awalia F , Kharisma Y
Published: March 2020

This aim of study is to explore the ability to make an appropriate diagnosis and treatment in clerkship students on their final examination as medical doctor. We used analytic method to 609 sheets of prescription from 180 clerkship students in their last try out Objective Structured Clinical Examination at Medical Faculty UNISBA, March 2018. There were 20 diagnoses from 10 groups of body systems. Based on different cases, clerkship students must write their own diagnosis and gave an appropriate pharmacological therapy for each diseases. The result showed there were more than 80% made an appropriate diagnosis and less than 50% made inappropriate pharmacological therapy. As conclusion, the ability to make proper therapy for clerkship medical student is lower than the ability to make an appropriate diagnosis.
Acceleration of epithelialization in different application of scaffolds and growth factors post tooth extractions controlled by a mobile application
Authors: Damayanti M M , Hernowo B S
Published: March 2020

Tissue engineering technology is widely used that involves the use of patients own biologically active proteins, growth factors and biomaterial scaffolds for therapeutic purposes. Epithelialization is an essential component of wound healing used as a defining parameter of a successful wound closure. The purpose of this research was to analyse differences of wound healing process post tooth extraction between application of platelet-rich fibrin and platelet-rich plasma as a growth factors and hydroxyapatite as a scaffold seen from thickness of epithelialization. This research was an animal experiment. 18 rabbits randomly divided into 2 groups of treatment (K1) apply platelet-rich fibrin post tooth extraction and (K2) apply of platelet-rich plasma plus hydroxyapatite post tooth extraction. Then each treatment group was divided randomly into 3 groups of observation time (Day 3, 7 and 14). Tissue biopsy to see histopathologic pattern is analysed based on thickness of epithelialization. The results showed that thickness of epithelialization in group PRP+HA is similar with group PRF (P = 0.304). Thickness of epithelialization base on observation time had a significant difference in each group (P<0, 001). It was concluded that application of platelet-rich fibrin, platelet-rich plasma and hydroxyapatite can accelerate the wound healing of tooth extraction socket by means of thickness of epithelialization increasing.
A mobile application assessing knowledge analysis and creative thinking skills of science teachers
Authors: Jusuf R , Sopandi W , Wulan A R , Sa’ud U S
Published: March 2020

Teachers with a good level of assessment literacy will bring their students towards good learning, because assessment and learning are two integrated concepts. The purpose of this study is to describe the pre-service elementary school teachers’ ability in understanding the concept of creative thinking assessment literacy in science subject. The method used in this study is a qualitative descriptive method. And the research sample are 25 pre-service elementary school teachers of 7th semester elementary school teacher education major. The instruments used were multiple choice test instruments about assessment of creative thinking literacy in science subjects. The results of the analysis show that the understanding of pre-service elementary school teachers about creative thinking assessment literacy in science subjects is 68% and is in the “fair” category, while the understanding of assessment literacy in science subjects is based on seven indicators of assessment literacy standards which are 70.86% and are in the “very good” category, and the understanding of creative thinking in science subjects based on four indicators of creative thinking is 73.25% and is in the “very good” category. Pre-service elementary school teachers must have better pedagogical and professional competence so that it is easier to carry out learning and assessment that is suitable for the development of elementary school students.
How to develop hydrocarbon e-textbook of chemistry based knowledge building environment with 4S TMD models?
Authors: Oktasari C , Anwar S , Priscylio G , Agustina N R , Lestari O , Wahyuni W S
Published: March 2020

This study aims to describe how to develop hydrocarbon e-textbook of chemistry based knowledge building environment with 4S TMD models. 4S TMD models consists of four stages i.e selection, structuring, characterization and didactic reduction. Hydrocarbon there are many applications in daily life. Knowledge building environment is a theory pioneered by Carl Bereiter and Marlene Scardamalia to construct knowledge. Knowledge building environment contains values that can build knowledge through the environment related to teaching material. The values contained in the knowledge building environment include attentiveness, careness, curiosity, critical, moderation, respect for environment, respect for health and wisdom. Developmental Research was used as method of the study consist of design, develop, and evaluation. In this article, we explain result of developed e-textbook of chemistry in selection and structuring stages. Selection stage consist of the curriculum based on the selection steps, the interrelationships between certain skill value and subject matter. Structuring stage consist of make a concept maps and macro structure. This research only to structuring stage characterization and didactic reduction stages will be carried out.
Student candidates’ literacy analysis using an ICT-based tool
Authors: Sajawandi L , Sa’ud U S , Musthafa B
Published: March 2020

This study aims to determine the readiness of schools in implementing the policy of school literacy movement as an effort to form literate generations and to analyze complex readiness in terms of facilities and school culture. This research was conducted in elementary schools in Pekalongan city and regency totaling 39 schools. This research uses qualitative research method. Data analysis uses the Miles and Huberman model steps as for steps (1) data reduction, (2) data presentation, and (3) drawing conclusions / verification. Data is collected through observation and interviews. The results of the study show that there are five principles of school literacy, namely 1). It should be in accordance with the developmental stages of student characteristics. 2) it uses a variety of texts and paying attention to the needs of students. 3) It must be in an integrated and sustainable manner. 4). It involves oral communication skills. 5) It should consider diversity. Of these five principles, in average, some schools only prepared the materials for schools, not the culture of school literacy. It has not yet been built in an integrated and sustainable manner considering that preparing literate generation should focus on sustainable processes that will benefit in the long time. Therefore, results of this study are important to be used as a reference for schools and policy makers in preparing schools so that they are ready to implement the school literacy movement for literate generations.
The role of a digital balance score card in increase the effectiveness of and efficiency to face business competition
Authors: Saprianto R , Lukito J
Published: March 2020

Balanced Scorecard developed by Robert Kaplan of Harvard and David Norton as a framework for measuring organizational performance using a more Balanced set of performance measures, role of will leadership is also needed in the organizations as the soul in the organization of a business to make changes and become pioneer in the enhancement, it can be manifested will said the effectiveness of, efficiency, the vision and the ability adapt in business environment, able to face competition and in the middle tight competition and reached a vision. Balance Scorecard suggests that we view the organization are: Financial, Customer, Internal Process, Organizational Capacity, there will be efficiency and effectivity achievement and vision and strategy can be applied so that in this case the business sensitivity to the environment can be achieved so that quality, service, creativity, innovation and competitive advantage can be created, the commitment and cooperation in the fields of that need to is built and furnished by all elements in the an organization that started as a rush for the local nature of the decrees issued sustainability constantly in an attitude.
Review on marine energy program
Authors: Abdullah K
Published: March 2020

As our fossil fuel is rapidly depleting, Indonesia need to explore new source of energy to support our economic development. One of this possibility come from the sea where the potential is estimated to reach 49 GW and only very small portion has been utilized. This paper describes activities related to marine energy development particularly in some selected Asian countries and the Pacific. Marine energy development described here is limited to power generation using sub-surface current and OTEC (Ocean Thermal Energy Conversation). It was the Tokyo Electric Company who started to build 100 kW OTEC on the island of Nauru in 1970, and it was the first system operating on grid. Marine energy studies, particularly on OTEC was first conducted by the IOES (Institute of Ocean Energy, Saga university). For the case of sub surface sea current research in Indonesia was first conducted by T-Files in which they constructed a 5 kW power generation and tested in Nusa Penda, Bali. Later in 2010 a 10 kW sub-surface sea current was also constructed and tested in Larantuka, Flores island. Although marine energy has been considered high cost several simulation studies in Indonesia have indicated that the cost of electricity production using OTEC could be reduced to below US$07/kWh.
Genetic variation of Tumour Necrosis factor in pulmonary Tuberculosis
Authors: Rahmawati F
Published: March 2020

Tuberculosis a major cause of mortality throughout the world, therefore, early diagnosis for the prevention is needed. One of the disease control strategies is the use of molecular genetics and its role in the severity of active pulmonary tuberculosis. Identify the tumor necrosis factor-alpha (TNF-a) gene polymorphism in patients with pulmonary tuberculosis in Surabaya Pulmonary Hospital. The research recruited 97 respondents having active pulmonary tuberculosis patients. There were 52 (53.6%) mild-moderate and 45 (46.4%) TB patients. DNA isolation was performed. DNA was detected using melting curve real-time PCR Light Cycler. Differences in the nucleotide bases were confirmed with the sequencing using the ABI genetic analyzer. The allele pattern, resulting from the inspection of SNPs TNF 238 and 308 genes, was more specific with the genotype frequencies of pulmonary tuberculosis TNF-238 94(96, 91%)GG and TNF-308 90(92, 78%) homozygous GG. The overview variations of the genotyping test melting curve of TNF-857, TNF-1031, TNF-863 showed more diverse variants. The TNF-α gene variants do not directly give different clinical manifestations of pulmonary tuberculosis patients. There are TNF-α gene polymorphisms in TNF-238, -857, -863, -308 and -1031 in patients with active pulmonary tuberculosis in Surabaya Lung Hospital. TNF-α gene polymorphisms were obtained on the SNPs TNF-238, TNF-857, TNF-863, TNF-308, TNF-1031sites of patients with active pulmonary tuberculosis in Surabaya Lung Hospital. Significant correlation test existed among the five types of TNF-α gene polymorphisms, i.e. p = 0.0001, r = 27%.
How private hospitals’ treatments in Indonesia are supportive towards the environment: A retrospective study
Authors: Ermawan R , Prijosedjati R A
Published: March 2020

Tuberculosa represent of orthopaedic challenge, a disease caused by Mycobacterium tuberculosis, one of the most common problem in the developing countries. Indonesia the most TB contributing country. Tuberculosa a Multi-Systemic Disease with Intra Pulmoner or Extra Pulmoner Tuberculosa manifest, One of the Extra Pulmoner Tuberculosa form is musculoskeletal TB, involvement as for spondylitis TB. This study aimed to evaluated Spondylitis TB profile and for database for next study at RSO Prof. DR. R Soeharso dan RSU. Dr. Moewardi Surakarta. The retrospective study included all patients diagnosed with Spondylitis tuberculosa with operative treatment in Prof. Dr. R. Soeharso Orthopaedic Hospital Surakarta from January 2017 to Desember 2017. This research was conducted by gathering patients’ data and evaluating them based on neurological post-operative with ASIA Score. Seventy-five patient with Spondylitis tuberculosa, 54 patients was treated in RSO Prof. dr. R. Soeharso, and 21 patients was treated in RSU dr. Moewardi. There are 35 male (%), and 40 female (%), with average 35 years old. With involved region of Spondylitis tuberculosa are 5 patient Cervical spine, 22 patient Thoracal spine, 21 patient Lumbar spine, 27 patient Thoracolumbar spine. Most operative treatment are Debridement, laminectomy, posterior stabilization for 47 patient. With good neurological outcome after 3 month are 66 case (89%). Spondylitis tuberculosa majority on adult (productive age) with most predilection on thoracolumbar region. With good outcome on Debridement, laminectomy and stabilization treatment.
Benefits of biopharmaca products towards healthy Indonesia
Authors: Sumarya I M , Suarda I W , Sudaryati N L G , Sitepu I
Published: March 2020

Biopharmaca is a biological preparation that comes from nature that has properties as a medicine. Biopharmaca products are categorized into three types, namely herbal medicine, standardized herbal medicine (OHT), and phytopharmaca. The research objective is to find out the benefits of biopharmaca products in leading a healthy Indonesia. Qualitative descriptive research with the method of collecting data is observation and recording documents. The results show that the benefits of biopharmaca products can improve health in the community, are more effective, more affordable, and have relatively smaller side effects. The use of biopharmaca products has global competitiveness that is utilized by residents of several countries such as: China (People’s Republic of China) reaching 90%, Chile reaching 71%, Colombia reaching 40%, France reaching 49%, Canada reaching 78%, Britain reaching 60%, The United States reached 42%, and Germany reached 73%. In moving towards a healthy Indonesia, biopharmaca products can be utilized. Based on the results of the research that biopharmaca products can be used in formal health services to improve the quality and degree of health in the community towards a healthy Indonesia.
Development of ASEAN counselor education standards
Authors: Suherman U , Ahman A , Solehuddin M , M Arip M A S B , Budiman N , Suryana D
Published: March 2020

This research is motivated by the importance of the development of ASEAN Counselor Education Standards whose member countries have similar cultural and geographic contexts. The purpose of the study is the formulation ASEAN Counselor Education Standards. The research was conducted through survey of lecturers and counselor education students UPI and UPSI. Data were collected through the ASEAN Counselor Education Standards Questionnaire. The findings of the study were (a) in the total analysis and the aspect there was no similarity of views between lecturers and students on the development of ASEAN Counselor Education Standards, but on the indicator analysis there was a similar view between lecturers and students on the development of ASEAN Counselor Education Standards, (b) both lecturers and students are important development of ASEAN Counselor Education Standards, (c) the formulation of the ASEAN Counselor Education Standard includes 1: Learning Environment, Standard 2: Professional Counseling Identity, Standard 3: Professional Practices, and Standards 4: Evaluation in the Program. The research recommendation is addressed to the higher education institution of counselor education organizers in ASEAN and subsequent researchs. The conclusion of the ASEAN counselor education standard can be used as guidance for the development of counselor education in guidance and counseling study program in ASEAN.
Performance study between polyurethane and styrofoam as diesel engine sound insulating materials on the traditional passenger ship
Authors: Febrian S
Published: March 2020

Indonesia as a maritime country and islands, boats are the only option for people to travel outside the region in order to meet daily needs and usually ships operating from morning to evening with the average shipping time 2-3 hours each way in which ships are generally small so that the engine and the passenger seemed to be in the same room and produce damage to the ear drums. The objectives of this study are knowing noise level and choose proper material for absorbing or dampening noise level. This research using under the provisions of the above then performed experiments to create a Diesel engine casing made from plywood to the outside while the inside is used Polyurethane (PU) and Styrofoam successful minimize noise due to the Diesel engine operation.
Geological based on area development: Terrain genetic unit method
Authors: Usman D N , Widayati S , Sriyanti S
Published: March 2020

This study aims to analyze the supporting factors, especially natural resources of mining materials for the development of the Pangalengan area, using the Terrain Genetic Unit (SGW) method. Pangalengan is one of the regions that has a wealth of natural resource potential, including mineral and rock resources, energy and geothermal resources and other natural resources that can be a support for regional development. The results of the study of holistic matrices and the direction of the development area for Pangalengan have the highest value of 291.5 and 360 compared to 4 other districts namely Kertasari, Ciwidey, Rancabali and Pasir Jambu. The presence of geothermal resources in Pangalengan is another multiplayer effect factor, which has a positive impact on the development in Pangalengan. The results of a holistic matrix analysis and regional development direction with elaboration of economic data obtained the results of 295 and 390.
The effect of sampling technique training using UNPAD statistical analysis series on sampling technique ability
Authors: Jatnika R , Haffas M , Agustiani H
Published: March 2020

UNPAD SAS (Statistical Analysis Series) is a software for analysing Statistical data. UNPAD SAS can be used to analyse descriptive statistics, nonparametric analysis, correlation analysis, and sample size determination. This research is an experimental study to determine the effect of sampling technique training using UNPAD SAS on sampling technique ability. The research design used one group pretest-posttest design. The independent variable in this study was the provision of sampling technique training using UNPAD SAS. The dependent variable was the ability of the sampling technique. The participants in this study were 32 students at the Faculty of Psychology, Universitas Padjadjaran. The ability of sampling techniques was measured using a questionnaire consisting of 28 items. The results of the data analysis showed a significant increase in the ability of the sampling technique after training compared to before taking the training (t = -13.145, p = 0.000).
Capability analysis of student mathematical representation viewed from self-regulated learning
Authors: Hidayati N , Usodo B , Subanti S
Published: March 2020

This study aims to analyze the ability of students’ mathematical representation in terms of Self-regulated Learning. This study focuses on the ability of visual representation, symbolic representation, and verbal representation. This study used a qualitative approach with test data collection techniques, questionnaires, and interviews. The data analysis technique used is the analysis technique according to Miles and Huberman through the phase of data reduction, data representation, and conclusion drawing. Students with SRL who are high in representation have lower grades than medium and low SRL The ability of verbal and symbolic representation of high SRL students has superior value from medium and low SRL. Indicators of mathematical representation can be achieved maximally by high SRL students. Students who have SRL are currently, the ability of visual representation is superior to high SRL students, symbol representation has a lower value than low SRL. So it can be concluded that SRL students are having difficulties in writing mathematical symbols. Low SRL students have advantages in visual representation. Indicators that can be achieved by SRL students are low only at the drawing stage. Low SRL students still have difficulty in expressing their abstract ideas in the form of mathematical representations.
Mathematical problem solving in students with disability based on prior mathematics ability
Authors: Muhafidin I , Nurlaelah E , Hasanah A
Published: March 2020

This research aims to understand the ability of deaf students to solve mathematical problem solving based on prior mathematical abilities. This research was conducted by using descriptive qualitative methods. Data collection techniques consists of tests, questionnaires, and interviews. The research subjects were deaf students in one of special schools in Bandung, Indonesia. The result of this study is problem solving abilities of 5 deaf students based on Prior Mathematics Ability. The result indicates one student has problem solving skills in a good category, three students are sufficient and the other one is in the low category. However, it does not mean that students who have Prior Mathematics Ability in a good category indicate that they also have good problem solving skills.
Enhancing concept mastery of students through STEM-project in scientific inquiry learning
Authors: Rachmayati D A , Kaniawati I , Hernani H
Published: March 2020

This study aims to examine the effect of STEM project in scientific inquiry learning towards enhancing concept mastery of students. The research method used was a quasi-experiment with the one group pretest-posttest design. Quantitative data was obtained through instrument of concept mastery test using a two-tier multiple choice instrument and then analyzed using dependent t-test. Based on the result of dependent t-test was found that there was significance difference between the pretest and posttest scores of students with sig = 0.000 (p<0.05). The enhancing between pretest and posttest score was obtained from N-gain analysis, the value of gain index is 0.64 showed that the enhancing of students’ concept mastery is in medium category. Based on the results obtained from this study, it showed that STEM project in scientific inquiry learning had positive impact on concept mastery of students, therefore it can be used as an alternative learning model in science learning that integrates technology.
Analysis of student needs for mathematics teaching materials
Authors: Annisah S , Zulela Z , Boeriswati E
Published: March 2020

The purpose of this study is to determine the mathematics teaching materials needed by students to improve problem-solving skills. This research is a qualitative descriptive study. The subjects of this study were PGMI students in the Metro city, province of Lampung. Data collection uses a non-test method that uses a questionnaire. The questionnaire consisted of 16 questions, which included eight questions about the analysis of learning resources (teaching materials) and 8 questions about determining learning resources (teaching materials). The results of this study are 1) mathematics teaching materials that are used effectively help students understand mathematical material, but are not effective in helping students develop problem-solving skills, 2) students need mathematics teaching materials based on contextual approaches to improve problem-solving skills. Based on the results of this study, it is necessary to develop mathematics teaching materials based on a contextual approach to improve problem-solving skills.
Experimental study of hydrocarbon refrigerant (R-1270) to replace R-32 in residential air conditioning system
Authors: Sumardi K , Nahadi N , Mutaufiq M
Published: March 2020

The purpose of this study was to test the performance of hydrocarbon refrigerant (R-1270) to replace R-32 refrigerant. The refrigerant R1270 is a propylene-base refrigerant (C3H6), while R32 is a synthetic refrigerant. Both refrigerants were tested on residential air conditioning systems with similar specifications. At pressure of 100 psig and external air temperature of 25 °C, the Coefficient of Performance (CoP) and Energy Efficiency Ratio (EER) of R32 were better than those of R32. The electrical power consumption of R1270 was 12.5 % more efficient than R32. In terms of volume used, R1270 required was 53.5 % lower than that of R32. The air temperature coming out of the evaporator of R1270 was 1 °C lower than that of R-32. This research showed that R-1270 could be used to replace R-32 effectively.
Effect of quenching on the electrical and optical properties of MoTe2
Authors: Marchenkov V V , Domozhirova A N , Parulin R A , Naumov S V , Makhnev A A , Shreder E I , Patrakov E I , Chistyakov V V , Ivanov A D , Huang J C A
Published: March 2020

The effect of quenching on the electrical resistivity and optical properties of MoTe2 compound was studied. Significant changes were detected in the behaviour and value of the electrical resistivity, indicating an increase in the metallic (conductive) properties of the compound, which is in good agreement with the data of optical measurements.
Influence of technological conditions on photoluminescent properties of halide perovskite nanocrystals
Authors: Belorus A O , Pleshanov I M , Doru-Tovt N V
Published: March 2020

We report on the technique for the synthesis of chlorine-free methylammonium lead bromide organic-inorganic perovskite nanocrystals with tunable green-blue photoluminescence. The synthesis was performed under ambient conditions at room temperature. Absorbance and photoluminescence characteristics were measured.
Peculiarities of the structural properties of InxGa1-xN polytype nanostructures grown by molecular-beam epitaxy
Authors: Gridchin V O , Kotlyar K P , Reznik R R , Shevchuk D S , Kirilenko D A , Bert N A , Soshnikov I P , Cirlin G E
Published: March 2020

In the article, the study of the morphology, crystal structure and chemical composition of InxGa1-xN nanostructures is presented. Scanning electron microscopy measurements show that the sample has a structure consisting of nanotubes, on top of which an array of nanocrystals (so-called “nanoflowers”) is formed. The results of transmission electron microscopy show that the nanotubes have a wurtzite crystal structure, whereas the “nanoflowers” exhibit both wurtzite and zinc blende one. The indium composition in wurtzite and zinc blende segments is about 20 % and 10 %, respectively.
Scanning tunneling microscopy of the tetraphenylporphyrin thin films on a graphite single-crystal substrate
Authors: Arias Muñoz J , Elistratova M A , Zakharova I B , Rykov S A
Published: March 2020

Features of the surface topography of a tetraphenylporphyrin film on a graphite single crystal (HOPG) substrate and the local current-voltage characteristics were studied using a scanning tunneling microscope under ambient conditions. STM images of surface were acquired on a scale from a few nanometers to 4 micrometers. Local tunnelling current-voltage characteristics in different ranges of bias voltage and in different directions of voltage scanning can have hysteresis due to the hopping electron conductivity in porphyrin.
Structure and surface morphology of GeSn/Si(001) layers grown by HW CVD with co-evaporation of Sn
Authors: Zaitsev A V , Kuz’min M Yu , Denisov S A , Shengurov V G , Chalkov V Yu , Kudrin A V , Ved’ M V , Filatov D O
Published: March 2020

This paper presents the results of the investigation of Ge1-xSnx epitaxial layers grown by the hot wire chemical vapor deposition (HW CVD) method with simultaneous evaporation of Sn from a standard effusion cell. The Ge1-xSnx with a Sn molar fraction of 7.2% and a full width at half maximum (FWHM) of the rocking curve of 7.6` demonstrated intense photoluminescence at room temperature. The peaks in the energy bands 0.70 – 0.73 eV and 0.63 – 0.65 eV have been observed in the photoluminescence spectra. These peaks were related to the direct and indirect interband radiative optical transitions in GeSn, respectively.
Study of current-voltage characteristics of InAsSb-based LED heterostructures in 4.2 - 300 K temperature range
Authors: Kuzmenko E V , Semakova A A , Bazhenov N L , Kizhaev S S , Chernyaev A V , Stoyanov N N , Mynbaev K D
Published: March 2020

Current-voltage characteristics of light-emitting diode heterostructures based on InAsSb epitaxial films and a multi quantum-well structure were studied in the temperature range T = 4.2–300 K. It is shown that transport through the heterostructures is governed by the diffusion and recombination mechanisms at temperatures close to 300 K. The tunnelling effect appears in the temperature range 4.2–77 K. The presence of quantum wells in the active layer results in increased diode leakage currents due to tunnelling.
Impact of shell material on the nonlinear properties of colloidal CdSe nanoplatelets
Authors: Golinskaya A D , Smirnov A M , Zharkova E V , Kozlova M V , Saidzhonov B M , Vasiliev R B , Dneprovskii V S
Published: March 2020

The nonlinear change in the absorption of colloidal CdSe nanoplatelets capped with a CdS-shell and a ZnS-shell was investigated in the case of the steady-state excitation regime. It was revealed that the nonlinear optical response of planar heretostructured nanocrystals is strongly influenced by the crystal structure of the core and shell material.
Model for nucleation of catalyst-free III-V nanowires on patterned substrates
Authors: Berdnikov Y , Sokolovskii A S , Sibirev N V
Published: March 2020

Catalyst-free growth of III-V nanowires enables different optoelectronic applications though usually requires substrate patterning to control the size and position of nanowires. However, the impact of substrate modification on the nanowire nucleation is not well-understood yet. The theoretical approach of this work studies the effect of substrate boundaries and adatom diffusion on the nucleation rate of catalyst-free III-V NWs on substrates with circularly symmetric patterning. In the model results, we distinguish and demonstrate four different scenarios of nanowire nucleation, depending on the properties of the patterned and unpatterned surfaces.
All-optical comparator based on linear chain of silicon nanoparticles
Authors: Sapegin A A , Barabanenkov M Yu , Italyantsev A G
Published: March 2020

A simultaneous excitation of two last particles of a finite linear chain of particles by two electromagnetic wave beams with arbitrary amplitudes of the electric field is considered. Using the example of a Si nanosphere chain, that does not support the resonant long-range electromagnetic energy transfer in the visible spectral range, it has been theoretically shown that self-consisted currents excited in a chain composed of a few Si mutually wave interacting nanospheres are related to the amplitude ratio of two incident beams. This technique provides a new way of comparing two optical signals in integrated microphotonic circuits.
Solar cells based on GaAs and carbon nanotubes
Authors: Mitin D M , Mozharov A M , Raudik S A , Fedorov V V , Neplokh V V , Rajanna P M , Nasibulin A G , Mukhin I S
Published: March 2020

This work is devoted to fabrication and characterization of a GaAs solar cell with a CNT top contact. The characteristics of a conventional solar cell with a metal contact grid and a solar cell with a CNT electrode were compared to demonstrate the benefits of a CNT based approach. The photoelectric properties of the solar cells were studied by measuring the IV characteristics and external quantum efficiency. The fabricated CNT solar cell showed better performance due to improved photocurrent collection efficiency. The demonstrated technology for the fabrication of CNT electrodes can be applied to a wide range of semiconductor photovoltaic devices, including flexible thin-film solar cells and solar cells based on nanowires.
Subcontact layers of p-InGaAs with minimal resistance for photodetectors of high-power laser radiation
Authors: Epoletov V S , Marichev A E , Popova T B , Pushnyi B V , Levin R V
Published: March 2020

It is necessary to minimize the resistance of electrical contacts to reduce heat losses in photovoltaic converters of laser radiation. The paper describes ways to reduce the resistance of electrical contacts for p-InP by choosing the composition of the subcontact layer based on p-InGaAs. For this purpose, layers of p-InGaAs with different compositions and bandgaps were grown by the MOCVD method. AgMn/Ni/Au contact metallization was deposited on samples to compare the characteristics of electrical contacts. The minimum specific contact resistance was 7• 10−5 Ω-cm2 for the layer with Eg
= 0.51 eV.
Source forensics of n-alkanes and n-fatty acids in urban aerosols using compound specific radiocarbon/stable carbon isotopic composition
Authors: Ren Lujie , Wang Yiyun , Kawamura Kimitaka , Bikkina Srinivas , Haghipour Negar , Wacker Lukas , Pavuluri Chandra Mouli , Zhang Zhimin , Yue Siyao , Sun Yele , Wang Zifa , Zhang Yanli , Feng Xiaojuan , Liu Cong-Qiang , Eglinton Timothy I , Fu Pingqing
Published: March 2020

n-Alkanes and fatty acids are important molecular markers for the source apportionment of organic matter in the atmosphere. Traditional approaches to date have mostly relied upon the source-specific differences in their molecular distributions and carbon preference index. Alternatively, we demonstrate here the use of stable carbon and radiocarbon isotopic composition (δ
13C and Δ14C, respectively) of n-alkanes and n-fatty acids in aerosols from two urban receptor sites (Beijing and Tianjin) in Northeast China to assess their sources in autumn. The Δ14C
n

-alkanes of C19–C24 and C26–C32 even-carbon homologs (−851 to −708‰) indicate their dominance from fossil fuel combustion. In contrast, the Δ14C of most abundant palmitic acid (C16:0) and stearic acid (C18:0) suggest a larger contribution from nonfossil sources (∼91%–94%), mainly due to inputs from cooking, biomass burning and microorganisms. Compared with lower Δ14C of C27 and C31
n-alkanes (−449‰), C29
n-alkane (−241‰) and C20–C30
n-fatty acids (−263‰) showed more contemporary likely due to significant contribution from plant litter and biomass burning that contain more fresh biogenic material. Fossil character of C27–C31
n-alkanes (40%) and C20–C30
n-fatty acids (30%) could be from soil resuspension and/or loess deposits in upwind regions through long-range atmospheric transport.
Dynamic supplier selection strategy towards negotiation process in beef industry using K-means clustering
Authors: Paduloh  , Djatna T , Sukardi  , Muslich
Published: March 2020

Dynamic supplier selection strategy is the actual condition to get the best supplier and selecting supplier based on company condition, in conditions of uncertain demand for beef. The key criteria when choosing suppliers include the Term of Payment, price and quality factor; these criteria are used by the company during the negotiation process. The purpose of this research is to get the most appropriate and profitable supplier, then obtain proof that K-means clustering can be used as a strategy to simplify the negotiation process in supplier selection. The method used for clustering is K-means. From the analysis, the company gets the right cluster supplier to facilitate the process of selecting suppliers and negotiate the price and time offered. The clustering process using K-means shows which supplier is the most profitable with characteristics that are almost the same as the specified centroid. Dynamic demand changes can be solved by changing the number of clusters to make it easier for companies and still earn profitable suppliers. Companies can negotiate with suppliers in clusters; thus, the suppliers can meet the standards given by the company. Further research is suggested to do clustering with more variety of attributes such as lead time of delivery, service, and capital owned by suppliers.
The changes of moisture content, total phenolic content and pasting profile caused by parboiling process of black rice
Authors: Widyasaputra R , Syamsir E , Budijanto S
Published: March 2020

Parboiling process of black rice could reduce cooking time and improve texture. However, parboiling process involving heat had the potency to affect moisture content, total phenolic content (TPC), and pasting profile. The aim of this research was to find the effect of parboiling process in the moisture content, TPC and pasting profile of black rice. There were three kinds of black rice. That was parboiled black rice A (3.8% concentration of sodium citrate, 5-minute steaming time, and 3.8 times freezing-thawing cycles), parboiled black rice B (5% concentration of sodium citrate, 15-minute steaming time, and 4 times freezing-thawing cycles) and normal black rice. Analysis of variance (α=5%) showed that there was a significant difference in moisture content and TPC parameter. The changes of black rice moisture content and total phenolic content caused by parboiling process A were bigger than B. Measurement of pasting profile explained that parboiled black rice A and B had lower pasting profile than normal black rice.
Effect of corn silk powder extracts using in vivo to lipid profile and liver fat
Authors: Haslina  , Wahjuningsih S B
Published: March 2020

This study aimed to determine the effect of corn silk powder extracts using in vivo to lipid profile and liver fat (a liver weight and adipose fat). The used experimental animals were 30 Sprague Dawley mice with 200-250 g mice weight divided into 6 groups. Each group of 5 mice was randomly determined, then the mice were caged individually. At the time of intervention for 21 days, group I received standard food, group II got hypercholesterolemia induction, group III received high-fat food induction and simvastatin drug, group IV induced hypercholesterolemia and corn silk extract dose 2.25ml, group V induced hypercholesterolemia and extract corn silk dose 4.5 ml, and group VI got hypercholesterolemia induction of corn silk extract dose 6.75 ml. The provision of corn silk extracts is based on recommendations for consumption of vegetables per day in humans from the Food and Drug Administration (FDA) which is 30-40 g/day. Corn silk extracts were given as much as 125 ml; 250 ml; and 375 ml. The dose was then converted to mice (0.018) to obtain 2.25 ml; 4.5 ml; and 6.75 ml. Corn silk powder extracts significantly affected (p<0.05) on lipid profile and liver fat (a liver weight and adipose fat). The best corn silk powder extract was at a dose of 2.25 ml with lipid profile (total cholesterol of 24.4% from 120.29±2.23 ml/dl to 90.87 ±2.01 ml/dl, HDL cholesterol of 30.35% from 56.60 ±2.81 ml/dl to 81.26±1.88 ml/dl, LDL cholesterol of 53.84% from 57.47±0.82 ml/dl to 26.53±0.77 ml/dl, triglycerides of 29.14% from 98.15±1.92 ml/dl to 69.54±6.78 ml/dl), and liver fat content in P3 treatment dose 6.75 ml with a liver weight of 7.09 g and adipose fat of 6.99 g.
Evaluation of biogas potential from empty fruit oil palm bunches
Authors: Suhartini S , Hidayat N , Nurika I
Published: March 2020

Indonesia experiences an increasing demand for energy, triggering the development of renewable energy, particularly from biomass resources. Empty fruit oil palm bunches (EFOB) residue is one of the potential lignocellulosic biomass highly abundant for further application in bioenergy generation such as biogas. This study was aimed to investigate and evaluate the potential of EFOB for biogas production using anaerobic digestion (AD) route. The biogas production in AD of EFOB was investigated in a batch experiment operated at an inoculum to substrate ratio (RI/S) of 6:1 for 30 days under the temperature of 37 °C. The results showed that the specific methane potential (SMP) of EFOB (without any pre-treatment) was 0.110 m3/kgVSadded. Using the anaerobic digestion scenario modeling, it was indicated that EFOB is a potential feedstock for biogas production using AD technology, either for electricity or biomethane production. The model also indicated that biogas and methane generation from AD of EFOB can contribute to enhancing the GHG emissions savings from replacing the use of fossil fuels or other non-renewable energy sources. Yet, the problem of high lignin content in EFOB has hindered the optimal biogas production. Therefore, the next stage of this study was to integrate biological pre-treatment to improve the efficacy of AD process.
Study of process innovation on African catfish (Clarias gariepinus) gluten-free product
Authors: Hasnelly  , Fitria A , Haswidya  , Cahyadi W
Published: March 2020

Ground dendeng was used as one of the innovations of African catfish gluten-free products in this research. The research aims of the study were to determine the effect of drying temperature and the addition of seaweed on characteristics of African catfish ground dendeng. Randomized block design (RBD) was carried out. The first stage of this research was aimed to determine the best formula for the product and analyzing protein, water, and fat content of African catfish meat. This research consisted of 2 factors (drying temperature and amount of seaweed). Characteristics of chemical, physical, organoleptical, and microbiological responses were analyzed. Results of this research showed that water content and taste attribute of African catfish ground dendeng was not affected by the temperature of drying and additional of seaweed. Meanwhile, the aroma, color, and texture attribute, also carbohydrate, protein, and fat content of African catfish ground dendeng were affected.
Extraction of baby java citrus (Citrus sinensis (L) Osbeck) peel by microwave-assisted extraction
Authors: Martati E , Ciptadi P P
Published: March 2020

Baby java citrus (Citrus sinensis(L)Osbeck) processing produces peel waste which contains phenolic compounds, flavonoids, and tannins. The aims of this research were to study the effect of ethanol concentration and extraction time by Microwave Assisted-Extraction on the bioactive compounds extracted. The research used Factorial Randomized Block Design (FRBD) with two factors which were ethanol concentration (90, 85 and 80%) and extraction time (10, 20, and 30 min). The results showed that ethanol concentration and extraction time and then their interaction had significant differences (p≤0.05) to total phenolic, total flavonoid, total tannin and antioxidant activity (IC50). The best result condition of extraction was ethanol 90% for 30 min, the extract obtained had characteristic as follow: total phenolic of 21.79 mg GAE/g, total flavonoid content 4.11 mg QE/g, total tannin content of 18.83 mg TAE/g and antioxidant activity (IC50) 348.19 ppm.
Crystallography in agriculture: green and red spinach (Amaranthus tricolor) grown on soil and hydroponic
Authors: Shariff I , Dwiratna S , Yamin B M
Published: March 2020

Red spinach is said to content calcium oxalate based on chemical analysis. This study is an attempt to look at the calcium oxalate crystals in the leaves. Red spinach was planted on organic soil and hydroponic system using soluble inorganic nutrients. A hydroponic plant grows faster by almost two-fold compared to the on organic soil. Both methods produced the same reddish-purple stem and leaves on red Amaranth. The size of the stomata was also about the same (2.4 x 0.9 micron). However, scanning electron microscope images of the leaf showed the presence of much more and bigger calcium oxalate crystal in the hydroponic leaf than that of spinach planted on organic soil. Green spinach grew on organic soil also contained calcium crystal but with lesser amount compared with the red spinach. Energy Dispersive X-ray analysis indicates the presence of C, O, Ca, K, Mg, P, S, and Nb in the leaves. The result of this study is useful for farmers in making their selection of plants to grow and public health information as well.
Changes of chemical contents during the withering process of white tea
Authors: Maulana H , Prawira-Atmaja M I , Shabri  , Hamdini N , Alyanisa J , Harianto S , Rohdiana D
Published: March 2020

White tea is produced from the bud of Camellia sinensis, which is processed with minimum processing. Withering is an important step in processing white tea. Withering in white tea processing utilizes sunlight to obtain moisture content properly. This study aims to determine the chemical changes of tea buds during the processing of white tea. Observations were carried out on the withering of 4, 21, 45, 69 and 93 hours. The parameters observed included total polyphenols, theaflavin, and thearubigin. The results showed that during the process of withering changes in total polyphenols, from 33% at 4 hours of withering, to 28% at 93 hours of withering. Theaflavin content decreases from 0.05% to 0.036% at 4 hours to 96 hours withering, respectively. This shows that enzymatic oxidation reactions still occur during the processing of white tea. Results suggest that withering for 96 hours on the processing of white tea is optimum. The present study also provides guidelines on application processing to produce a high quality of white tea.
Analysis and design of service failure prevention system in online culinary business
Authors: Juarsa R P , Djatna T , Suparno O
Published: March 2020

Online culinary businesses are in charge of preventive service failure to avoid greater loss and keeping service performance. The losses occurred due to protracted customer disappointment with service failures which lead to worse churning customers. We propose a prevention system to identify and allocate the failure position. It also sets the action rules to failure. This requires to analyze the current failure structure and cause. This work used decision tree classification (ID3) to design the rule. The failure structure was denied by the component of delivery time and food quality. The parameters to allocate the failure were delivery time, traffic jam, rush hour ordering, weekend/weekday order, rain/not rain day, giving GPS/not, suitable order, food complement, and packaging quality. It had four failure types: none, low, medium, and high. The model had 73% of accuracy to classify failure. The action for low failure was in charge by the delivery man in the form to speed the delivery time not exceed 85 minutes and by kitchen staff in the form to check the order before it sent. The medium failure was in charge by the delivery man in the form to speed the delivery time not exceed 55 minutes in not rush hour order.