bluuebunny/crossref_metadata_2025 huggingface dataset:
Analysis of Critical Thinking Skills of Senior High School Students in Biological Learning
Authors: Sari R I , Karyanto P , Muzzazinah
Published: October 2019

This study aims to describe the critical thinking skills in students of XI (eleventh) grade. The type of this research was descriptive. This research was carried out on students of XI grade (N = 108) by working on tests of critical thinking skills with instruments adapted from Facione including interpretation, analysis, evaluation, explanation, conclusion, and self-regulation. The results showed that students’ critical thinking skills in interpretation were in the high category 77%, while in analysis was 46%, evaluation was 51%, explanation was 45%, conclusion was 54%, and self-regulation was 57%, which were classified as low category. For an average of all indicators, it was 55%. The conclusion of this study showed that students’ critical thinking skills were still in the low category, so that the development was needed in the learning process to be able to improve several indicators of critical thinking skills.
Computational Aspects of Some Algorithms for The Multiperiod Degree Constrained Minimum Spanning Tree Problem
Authors: Wamiliana  , Usman Mustofa , Warsono  , Warsito
Published: October 2019

Given a graph G(V,E), where V is the set of vertices and E is the set of edges connecting vertices in V, and for every edge eij there is an associated weight cij ≥0, The Multi Period Degree Constrained Minimum Spanning Tree (MPDCMST) is a problem of finding an MST while also considering the degree constrained on every vertex, and satisfying vertices installation on every period. The restriction on the vertex installation is needed due to some conditions such as fund limitation, harsh weather, and so on. In this research some algorithms developed to solve the MPDCMST Problem will be discussed and compared.
Characteristics of Hazard Rate Functions of Log-Normal Distributions
Authors: Kurniasari D , Widyarini R , Warsono  , Antonio Y
Published: October 2019

Distribution of Survival Analysis categorized in three functions those are: survival function, probability density function, and hazard rate function. Hazard rate function is used to analyze extreme value from a probability model of a distribution. One of the interesting distributions is log-normal distribution which is used for modeling of maintenance of a system. To analyze characteristics of hazard rate function of log-normal distribution, the Glaser method approach is used. The results are log-normal distribution have three hazard rate patterns those are increasing, decreasing or upside-down bathtub (∩).
Implementation of Dynamic Mutual Information and Support Vector Machine for Customer Loyalty Classification
Authors: Sulistiani H , Muludi K , Syarif A
Published: October 2019

Fast Moving Consumer Goods (FMCG) is known one of the important industrial sectors worldwide. It includes household and personal care products as well as processed foods and beverages. Because of the tight competition company must develop good marketing strategies. So, it is important for the company to know customer loyalty and also to predict the income as reference in company development planning. Data mining now is becoming popular technique for predicting customer loyalty. One of the well known data mining strategies is retaining customer’s strategy. In this paper, we would present a new model for predicting customer loyalty. The model is based on Dynamic Mutual Information and Support Vector Machine (DMI-SVM) to identify the relevant factors that affect the performance of the classification of customer loyalty. The comparison of two classification methods and several selected features is given to show the effectiveness of the methods. We validated the model by 10-fold cross validation method. Classification accuracy, precision, recall and f-measure are used to evaluate classifier performance on a test/hold-out sample. A result in this paper is shown that SVM method gives better performance accuracy than Naïve Bayes.
E-crm Information System for Tapis Lampung SMEs
Authors: Damayanti  , Warsito  , Meilinda  , Manurung P , Sembiring S
Published: October 2019

Companies must have a strong competitive strategy in the market in meeting customer needs, it is necessary an information system that applies the method of customer relationship management. Target for this research were SMEs Tapis in Lampung Indonesia. Tapis Lampung is one of the clothes used in Lampung Indonesia culture. Tapis Lampung must be introduced and disseminated, not only in Indonesia, but in overseas. Problem in this study is product orders are still coming directly to the location and via telephone, as well as product marketing through Instagram media. Orders are recorded in the book, so that data processing is less effective and efficient. There is no consumer database to see the number of existing customers, do not yet have communication and service good to consumers. The purpose of this study is to produce an information system application program using web-based E-crm method which is a strategy to increase sales, expand marketing and improve services to consumers. The application of web-based CRM methods in Tapis Lampung SMEs is important so that they can open sales opportunities globally, and have a good relationship with consumers because they can provide services to consumers that are more effective and efficient.
Evaluation of Commercial Feed Replacement Fermented Local Food Mixed on Performance of Male Local Duck
Authors: Septinova D , fathul F , Santosa P E
Published: October 2019

This study aims to determine the effect of mixing of fermented feed ingredients with EM4 on feed consumption, body weight gain, feed covers, and income over feed cost. The materials were 40 Mojosari male ducks, commercial feed plus mixed feed ingredients of oil palm carnel cake, cassava sludge, and rice bran (80:10:10). Experimented is arranged in Completely Randomized Design with five treatments and four replications. The treatments were T0 (100% commercial feed), T1 (95% commercial feed + 5% fermented local feed mixed), T2 (90% commercial feed + 10% fermented local feed mixed), T3 (85% commercial feed + 15% fermented local feed mixed), and T4 (80% commercial feed + 20% fermented local feed mixed). Analysis of variance were conducted followed by Turkey test. The result showed that fermented local feed mixed until 20% in commercial feed has no negative effect (P>0,05) on feed consumption, body weight gain, feed conversion, and income over feed cost. The treatment of fermented local feed mixed was safe for Mojosari male duck.
The Implementation of Simple Additive Weighting (SAW) Method in Decision Support System for the Best School Selection in Jambi
Authors: Ibrahim A , Surya R A
Published: October 2019

Jambi Education Office, is a government institution located in the city of Jambi which is one of the government institutions engaged in education. It serves all existing schools in Jambi. In the process of selecting the best schools, there are many obstacles facing the educators; the condition of the building and the facilities at the school. This happens because of the number of schools located in Jambi. Therefore, not all schools will be the best schools; only those which meet the criteria will be the best school. It can be done by through the processing of decision support system using a method called Simple Additive Weighting. This system can be used to determine which schools are eligible to be the best schools in Jambi. The utilization of decision support system with Simple Additive Weighting method can determine the weight value for each attribute, then proceed with a ranking process that will select the best alternative from a number of alternatives. In this case, the intended alternative is the right ones to become the best schools based on the specified criteria.
Semantic SLA for Selecting SAAS ERP
Authors: Hijriani A , Sarno R
Published: October 2019

Service Level Agreement (SLA) is a contract between a service provider and a service consumer. It consists of quality of service (QoS) property and the business properties. In a business environment using Software as a Service (SaaS), SLA and QoS play an essential role in their promising service performance. In this case, the attributes of QoS specified in SLA should show the non-functional attributes of a web service; yet, there, so far, have not been any QoS statement in web service definition language (WSDL) file. This research proposes the selection of SaaS ERP based on the semantic SLA developed using ontology. Analytic Hierarchy Process (AHP) method is employed to establish the rank of a tenant’s SLA. Subsequently, to create the rank of SLA which has the same AHP scores, the weighted tree algorithm is used. The results show that the combined method (AHP-Ontology) can provide precision reaching at 0.792, better recall at 0.795 and better f-measure at 0.793. Also, the best accuracy result through this method can reach 86.23%, better than AHP-Euclidean method - only reaching the best accuracy level at 59.03%.
k-Nearest Neighbor (k-NN) Classification for Recognition of the Batik Lampung Motifs
Authors: Andrian R , Naufal M A , Hermanto B , Junaidi A , Lumbanraja F R
Published: October 2019

Batik is a famous name of a traditional fabric from Java. It has been admitted as one if the traditional cultural heritage of Indonesia by UNESCO since October 2nd, 2009. Over the time, Batik is copied and modified by many regions in Indonesia resulting some new unique motifs. Batik Lampung is an sample of them. This paper deals with the k-Nearest Neighbor classification of the motifs (pattern) of the Batik Lampung. The known motifs of Batik Lampung consist of Jung Agung, Siger Kembang Cengkih, Siger Ratu Agung, and Sembagi. The original image samples are stored in RGB. They are firstly resized into 50 x 50 pixels and then converted to grayscale image. To recognize them, the Gray Level Co-Occurence Matrix (GLCM) feature is extracted and k-Nearest Neighbor (k-NN) with values of k = 3, 5, 7, 9, 11 and orientation angle of 00 450, 900, 1350 is applied to classify the motifs. The best accuracy is achieved at the rate 97,96% for k = 7 and angle1350.
Develop tools and softwares for the assessment of ethnic minority Vietnamese primary school students
Authors: Thanh Quy Ngo Thi , Thu Thuy Nguyen Thi , Ngoc Anh Tran Thi , Quoc Dao Kien
Published: October 2019

Language education has been considered a crucial issue by many countries and there have been studies on this area. By applying research achievements in the modern language of the world, this article focuses on the issue of Vietnamese language education for ethnic minority students at primary schools in Northwest Vietnam by a set of standards, tools and assessment software. In order to handle the problem, we use a mixed method in the study of the social sciences and humanities together with quantitative and qualitative research methods. We survey some typical primary schools in which ethnic minorities are living and studying, such as Thai, Muong, Dao, Mong, and Tay ethnic groups. After that, we develop a set of standards, tools and Vietnamese language proficiency assessment software for ethnic minority students in the Northwest of Vietnam. The data, which is composed of four skills including reading-writing-speaking-listening with a total score of 100, is designed by a software that has both online and offline features. Our team made an experimental research with 5000 test times. The research results will contribute significantly to the enhancement of Vietnamese language proficiency for ethnic minority students in the Northwest region of Vietnam in particular and those who learn Vietnamese as a second language in general.
Needs Assessment for the 21st Century Teaching and Learning in STEM Education to Promote Students’ Problem Solving in Thailand
Authors: Kinboon Wutcharapong , Sanghuaypai Supphachai , Nantachukra Artha
Published: October 2019

The purposes of this study were 1) to investigate the current issues and the needs for the 21st century teaching and learning management in science and technology based on STEM education to solve issues in schools under the Office of Khon Kaen Primary Education Area 4, 2) to study the human resource development methods to enhance technology knowledge and skills to apply in solving science learning issues in schools by adopting STEM education approach, and 3) to propose the guidelines to support information technology and educational management based on STEM education. The population used in this study was a total of 2,185 teachers and staff in educational institutes under the Office of Khon Kaen Primary Education Area 4 in the academic year 2018. The 445 samples were selected by using cluster purposing sampling technique. The research tools used in this study were semi-structured questionnaire with 5-Likert scale questions divided into 2 parts: general information of respondents in the first part and open-ended questions in the second part asking the respondents’ suggestions on future development of educational management. Data were analyzed by using descriptive statistics, percentage, mean, and standard deviation. The interpretation was also used in the content analysis. The findings in the study are as follows: 1) Behavioral abilities related to the technology adoption to solve science learning management issues were found in 5 aspects, including seeking, using, collecting, selecting, and writing information skills. From the overall behavioral assessment, the level of knowledge in technology and technology skills for communication was found at a high level (X = 4.52, S.D. = 0.66).2) The human resources development methods to enhance and apply technology knowledge and skills in solving science learning issues in schools were effectively implemented by adopting STEM education approach. The technology used in science learning issues should be verifiable, adaptable, and up-to-date. 3) The guidelines developed the teachers’ and staff’s knowledge and skills of information technology, which in turn, supported educational management based on STEM education effectively in practice.
Implementation of ecovillage values model as Mandiri village and environmental culture in the community of Sukasari Kidul village district of Argapura, regency of Majalengka
Authors: Hidayat M , Kembara M D , Logayah D S
Published: October 2019

Daily human life on the face of the earth is influenced and affects the surrounding environment. Sometimes people feel free to live and apart from the support of the surrounding environment. Therefore, it is appropriate for us in our daily lives to need to maintain and manage the environment. Especially in various development programs that have the main goal of increasing the level of human welfare that needs to be supported by economic capital, social capital and natural capital as well as the environment or ecosystem. Development can be seen as planned efforts to change human culture. Changes in the social system of local communities can also cause changes to the ecosystem. The ecovillage concept aims to change the mindset of society in changing behavior to be more concerned about the environment. The potential possessed by Sukasari Kidul Village is agricultural and plantation products.
The effect of season on farmer’s purchasing of liquid leaf fertilizers
Authors: Purnomo D , Dukat D , Atmaja I S W
Published: October 2019

This aim of this research is to analyse the effect of planting season factor on the purchasing intensity of liquid leaf fertilizer products by onion farmers in Brebes, Central Java Indonesia. This research was conducted by using a survey approach through interviews of 100 respondents of onion farmers on April until May 2017. The effect of planting season factor on the purchasing of liquid leaf fertilizer on the purchasing intensity were analysed by using t-independent sample test and dummy regression analysis. The result shows that intensity of the use of liquid fertilizer was affected by the planting season. The purchasing intensity of liquid fertilizer products by the farmers in wet season (10.26 litter ha-1) was higher than the dry season (4,81 litter ha−1)
The correlation of mother’s knowledge as a risk factor for preterm delivery, study in: Puskesmas Pamitran, Pekalangan, Astanagarib, and Pulasaren in Cirebon City
Authors: Putri D , Pratamawati T M , Affandi T
Published: October 2019

Preterm birth is a birth that takes place less than 37 weeks. The incidence of preterm birth is still quite high, with the number of preterm birth Estimated and around 15 million every year in the world. This study aims to determine the relationship between mother’s knowledge as a risk factor of preterm birth in Puskesmas Pamitran, Pekalangan, Astanagarib, and Pulasaren Cirebon. This research is Descriptive and Analytic using Case Control design. The population of this study were mothers with a history of preterm birth at Puskesmas Pamitran, Pekalangan, Astanagarib, and Pulasaren Cirebon City in 2015-2016. The description of mother’s knowledge with birth history of preterm in good category is 17 (89,5%) and less category is 2 (10,5%) and mother’s knowledge with normal birth history mostly in good category that is 31 (81,6%) and less as much as 7 (18,4%), maternal birth history mostly normal. The result using Chi-square correlation obtained Pvalue of 0.703, it can be concluded that no relation between mother’s knowledge to the risk of preterm birth in Puskesmas Pamitran, Pekalangan, Astanagarib and Pulasaren in Cirebon. No correlation between mother’s knowledge as risk factor of preterm birth in Puskesmas Pamitran, Pekalangan, Astanagarib and Pulasaren in Cirebon City.
Tannin treatment for protecting feed protein degradation in the rumen in vitro
Authors: Arisya W , Ridwan R , Ridla M , Jayanegara A
Published: October 2019

This experiment was conducted to evaluate the effect of tannin extract addition for protecting feed protein from microbial degradation in the rumen in vitro. Design of experiment employed a factorial 5 × 2 randomized complete block design with 3 replicates. The first factor was tannin extract addition, i.e., control without tannin (T0), addition of 2% tannic acid (T1), addition of 2% tannin chestnut (T2), addition of 2% tannin extract from Calliandra calothyrsus (T3), and addition of 2% tannin extract from Clidemia hirta (T4). The second factor was two feed ingredients rich in protein contents, consisted of soybean meal and Indigofera zollingeriana forage. Results showed that there was no interaction between tannin treatment and different protein sources. Tannin addition from various sources significantly decreased degradation of dry matter and rumen degradable protein (P<0.05), but had no significant effects on pH, dry matter digestibility and crude protein digestibility. Comparing among different tannin sources, the best tannin to protect protein degradation was chestnut tannin. Indigofera zollingeriana forage had higher undegradable protein than soybean meal after being added with tannin (P<0.05). It can be concluded that tannin treatment is able to reduce feed protein degradation.
Assessing the time-sensitive impacts of energy efficiency and flexibility in the US building sector
Authors: Satre-Meloy Aven , Langevin Jared
Published: October 2019

The building sector consumes 75% of US electricity, offering substantial energy, cost, and CO2 emissions savings potential. New technologies enable buildings to flexibly manage electric loads across different times of day and season in support of a low-cost, low-carbon electric grid. Assessing the value of such technologies requires an understanding of building electric load variability at a higher temporal resolution than is demonstrated in previous studies of US building efficiency potential. We adapt Scout, an open-access model of US building energy use, to characterize sub-annual variations in baseline building electricity use, costs, and emissions at the national scale. We apply this baseline in time-sensitive analyses of the energy, cost, and CO2 emissions savings potential of various degrees of energy efficiency and flexibility, finding that efficiency continues to have strong value in a time-sensitive assessment framework while the value of flexibility depends on assumed electricity rates, measure magnitude and duration, and the amount of savings already captured by efficiency.
Large-scale pasture restoration may not be the best option to reduce greenhouse gas emissions in Brazil
Authors: Batista Evandro , Soares-Filho Britaldo , Barbosa Fabiano , Merry Frank , Davis Juliana , van der Hoff Richard , Rajão Raoni G
Published: October 2019

Cattle ranching accounts for 44% of the greenhouse gas (GHG) emissions from the land use sector in Brazil. In response, Brazil has proposed a massive pasture restoration program that aspires to make ranching more competitive while at the same time reducing associated GHG emissions. Pasture restoration, however, is only one of several intensification options that could be employed to achieve these goals. Here we analyze potential production, economic return and GHG emissions from an intensification strategy based mainly on pasture restoration and compare its productive, economic and GHG emissions performances with intensification options more focused on supplemental feeding (grain-feed supplementation of grazing animals and animal finishing in feedlots). To this end, we developed a multi-sectoral, deterministic simulation model of the ranching system and applied it to Mato Grosso state, the largest producer and earliest adopter of intensive production. To account for GHG emissions, we performed a life cycle analysis of a complete beef production cycle. Our results show that an intensification strategy focused more heavily on pasture restoration does reduce GHG emissions but produces the least favorable economic and GHG emissions outcomes when compared with a range of supplemental feeding alternatives. In view of these results, Brazil should seek a more diversified strategies for cattle intensification in its climate mitigation policy.
The Role of Rumen Fluid as A Source of Methanogenic Bacteria on Coalbed Methane Activation
Authors: Marlina E T , Ardiansyah Y , Kurnani T B A , Hidayati Y A , Rahmah K N , Joni I M , Harlia E
Published: October 2019

CBM is highly potential as a source of renewable energy that can be activated with methanogenic bacteria. The rumen content is a waste of slaughterhouse can be utilized as a source of methanogenic bacteria. The aims to study the role of rumen fluid as a source of methanogenic bacteria in activating coal bed methane. Descriptive research method using 2 types of media consist of standard media (A) and enriched media (B). The application of rumen fluids for CBM activators are lignite, sub-bituminous, and bituminous coal in biogenic fermentation. The inoculum dose was observed at levels 6% of rumen media. The technique for counting microbes is through Total Plate Count in anaerobic Hungate tube. VFAs production was measured by titration method and methane production was analysed by gas chromatography (GC). All of parameter observed was measured on days 0, 2, 10, and 15. The highest number of anaerobic bacteria was found on day 10 and methane production was found on day 15. The highest production of VFA and methane occurred in biogenic fermentation of lignite. The results showed that the contents of rumen have the potential for the activation of coal bed methane in biogenic fermentation.
The Potency of Anredera cordifolia as Botanical Pesticide for Sustainable Blast Disease (Pyricularia oryzae) Management on Paddy
Authors: Yulia E , Widiantini F , Kurniawan W , Berliani I
Published: October 2019

Blast disease (Pyricularia oryzae) is one of the most important diseases of rice that can significantly reduce paddy production. This disease causes a potential loss of 3.65 tonnes/ha with loss percentages ranging from 60-100% if the disease is not handled properly. In spite of the issue of the negative effects of synthetic pesticide usage, the blast disease is commonly controlled using synthetic fungicides. Therefore, the exploration of potential botanical pesticides may provide safer and environmentally friendly blast disease management. This study aimed to test the potential of binahong plant (Anredera cordifolia) as botanical fungicide to inhibit the growth of P. oryzae and the development of blast disease in laboratory testing. The experiments were arranged in a Completely Randomized Design (CRD) consisting of 7 treatments of 5 extract concentrations and 2 controls. All treatments were repeated 5 times. The effectiveness of binahong leaf extract in controlling the pathogen and the disease was tested using poisoned food technique and detached leaf assay. The binahong leaf extract tested in the concentration range of 0.25-2% showed the ability to inhibit the growth of P. oryzae with the highest colony growth inhibition of 25.11%. Characteristics of P. oryzae mycelium and colony in the binahong leaf extract treatment were different from the control treatment. The treatment of paddy leaves with binahong leaf extract suppressed the blast disease development through the lessening of diseased paddy leaf area percentages. This study indicates the potency of binahong leaf extract for sustainable rice blast disease management.
Isolation and Biochemical Characterization of Extracellular Proteolityc Enzym From Lactic Acid Bacteria Isolated From Various Indonesian Traditional Fermented Product (Bakasam)
Authors: Suradi K , Chairunnisa H , Wulandari E , Putranto W S
Published: October 2019

Local isolates of lactic acid bacteria isolated from Bakasam had potential to producing extracellular proteases. The research was carried out with the purpose of knowing the biochemical character of protease produced from isolates of lactic acid bacteria. The results showed extracellular protease isolates BAL 2 (Lactobacillus acidophillus) has a specific activity i.e. of 0.89 U/mg. Biochemical characterization of proteases indicates optimum pH 5.5, and is inhibited by chelating agent EDTA. The result of the purification with Sephadex G-100 column showed a band on SDS-PAGE with the size of molecular weight approximately 90 kD.
Study of Empowerment Smallholders Cocoa Based on Agro-Industry Approach
Authors: Trimo L , Hidayat S , Ernah
Published: October 2019

Empowering smallholders’ cocoa based on agro-industry requires readiness of the cocoa commodity itself from on-farm to off-farm. The research technique conducted in this study is a descriptive survey approach. The research site is Luwu Raya in South Sulawesi Province. This study uses literature and interviews as a data collection technique. Interviews were conducted with related parties such as government agencies, cooperatives, manufacturers, cocoa farmers associations, and farmer groups which were selected purposively. Collecting secondary data is done by collecting documents in the relevant agencies. Data and information obtained were analyzed descriptively correlatively. The results showed that empowerment of community cocoa into an independent community through agro-industry became a necessity, considering the potential of the community’s cocoa in producing cocoa beans was quite large and only a small portion was processed into finished products. To that end, in order to reach an independent community on cocoa commodities, various things are needed such as transferring technology based on local potential, facilitating the government in providing bailouts and processing machines, and supporting regulations that favor farmers.
Study of winding inter turn short circuit effect on permanent magnet synchronous motor performance
Authors: Liu Z Y , Sun J , He Y-L , Gao H-B , Sheng C-X , Xu X-B
Published: October 2019

Single phase winding’s inter turn short circuit is a common fault in permanent magnet synchronous motor, the short circuit will cause the change of the motor performance to various degrees. In this paper, a 70 kW permanent magnet motor is taken as an example, and ANSYS Maxwell software is used to establish the model of permanent magnet synchronous motor. The inter turn short circuit fault is simulated by reducing the number of turns of the coil. With the help of the software’s powerful electromagnetic field analysis ability and post-processing function, the fault influence on stator winding phase current, electromotive force, torque fluctuation and iron loss, copper loss effect are studied; the current signal is extracted to analyze the relationship between the changes and it is concluded that the amplitude of the third harmonic (150 Hz) of the current increases with the increase of the number of inter-turn short circuit of the A-phase stator. The result can provide the basis for early stage fault diagnosis of the inter turn short circuit.
Development of two-phase interleaved synchronous rectification DC-DC for commercial vehicle engine ECU
Authors: Mei J W , Liu J , Luo T , Wei H B
Published: October 2019

The commercial vehicle diesel engine ECU and the electronically controlled common rail system power supply developed in this paper adopt the two-phase BUCK converter as the main loop. Considering the problems of large current fluctuation, high continuum diode loss and possible non-uniform current in parallel connection of traditional BUCK converter, a control strategy of two-phase staggered parallel synchronous rectifier BUCK converter is proposed. The relationship between current fluctuation and inductance, switching frequency and duty cycle of different operating modes is theoretically analyzed, and the current fluctuation of traditional BUCK converter is compared. The prototype test results show that the converter structure and control strategy effectively reduce the output current fluctuation and improve the system power density.
Comprehensive Evaluation of Electricity Market Based on Analytic Hierarchy Process and Evidential Reasoning Methods
Authors: Jing Z X , Shi J H , Luo Z Y , Chen D P , Chen Z Y
Published: October 2019

Based on the analysis of the current domestic and international methods of power market evaluation, this paper combines the actual situation of Guangdong power market to construct an evaluation index system suitable for Guangdong power market, and proposes a comprehensive evaluation method model of electricity market based on analytic hierarchy process and evidence reasoning method. The model uses the fuzzy method to evaluate the confidence of each index, the analytic hierarchy process to determine the weight of each index, and the evidence reasoning method to integrate the indexes to obtain the comprehensive evaluation results. The example analysis uses this method to evaluate the fairness of the monthly competitive market in Guangdong in the second half of 2018, and verifies the applicability of the evaluation method model.
State evaluation of relay protection system for state maintenance
Authors: Wang J F , Yang P W , Chen X L , Ren Z , Wang X Y , Lu J Q
Published: October 2019

Relay protection is the first line of defense for power systems. Its reliable operation is an important guarantee for the safety and stability of power system. At present, Chinese relay protection system has long been implemented with regular planned maintenance and repaired supplemented by after-accident maintenance. This maintenance system has greatly caused the loss and waste of manpower, material resources and financial resources. It is urgently necessary to adopt a reasonable maintenance strategy based on the actual operating state of relay protection. The state maintenance of the relay protection system can formulate the maintenance strategy based on the actual operating state of the relay protection system, which can effectively improve the reliability of the relay protection system. Therefore, this paper studies the state evaluation of the relay protection system for state maintenance. Develop maintenance strategy based on the evaluation results of the current operating state of the protection system. It is of great significance to strengthen the reliability and operation level of the relay protection system and ensure the safe operation of the power grid.
Analysis and Research on 500kV Bus Power Imbalance in Dispatching End UHV near Zone
Authors: Jiang H , Yuan M J , Li Q , Wang Z H , Liu H Y
Published: October 2019

As a result of long distance of UHV AC transmission power transmission and fluctuations of tie-line power, large fluctuations exist in UHV near zone 500kV trend line, which seriously affects the calculation and assessment of bus efficiency in smart grid. In order to enhance the quality of the station fundamental data, through the research on sending the remote measurement acquisition principle, we found that measurement accuracy and Telemetry sent out of sync are main reasons. Combining with the current technology situation, it describes the basic ideas and implementation process of the two schemes, and points out the advantages and disadvantages of each scheme at the same time. For the traditional substation, it puts forward the Bay Control Unit (BCU) and Remote terminal units (RTU) reconstruction scheme based on GPS synchronization acquisition. BCU accepts GPS signal, sends the change telemetry data, RTU supports packing and sending important telemetry data under normal circumstances. When the BCU is abnormal or the synchronization is abnormal, RTU No packaging, only sends change telemetry data. So, important telemetry is fully synchronized under normal conditions, while data from abnormal BCU can also be effectively reflected in the SCADA. For new generation of smart substation, it raises a synchronous acquisition implementation based on Cluster Bay Control Unit (CBCU), the CBCU accept all SV message from the same bus, which can ensure bus power calculations and sent at the same time regardless of change trigger mode. Finally, it takes the UHV substation as a simulation model, the 500kV bus telemetry values as the basic data, finishes the bus imbalance simulation to verify the effectiveness of the scheme.
Identification and characterisation of two high-affinity glucose transporters from the spoilage yeastBrettanomyces bruxellensis
Authors: Tiukova Ievgeniia A , Møller-Hansen Iben , Belew Zeinu M , Darbani Behrooz , Boles Eckhard , Nour-Eldin Hussam H , Linder Tomas , Nielsen Jens , Borodina Irina
Published: October 2019

The yeast Brettanomyces bruxellensis (syn. Dekkera bruxellensis) is an emerging and undesirable contaminant in industrial low-sugar ethanol fermentations that employ the yeast Saccharomyces cerevisiae. High-affinity glucose import in B. bruxellensis has been proposed to be the mechanism by which this yeast can outcompete S. cerevisiae. The present study describes the characterization of two B. bruxellensis genes (BHT1 and BHT3) believed to encode putative high-affinity glucose transporters. In vitro-generated transcripts of both genes as well as the S. cerevisiae HXT7 high-affinity glucose transporter were injected into Xenopus laevis oocytes and subsequent glucose uptake rates were assayed using 14C-labelled glucose. At 0.1 mM glucose, Bht1p was shown to transport glucose five times faster than Hxt7p. pH affected the rate of glucose transport by Bht1p and Bht3p, indicating an active glucose transport mechanism that involves proton symport. These results suggest a possible role for BHT1 and BHT3 in the competitive ability of B. bruxellensis.
Immunotherapy with immune checkpoint inhibitors in colorectal cancer: what is the future beyond deficient mismatch-repair tumours?
Authors: Huyghe Nicolas , Baldin Paméla , Van den Eynde Marc
Published: October 2019

Following initial success in melanoma and lung tumours, immune checkpoint inhibitors (ICIs) are now well recognized as a major immunotherapy treatment modality for multiple types of solid cancers. In colorectal cancer (CRC), the small subset that is mismatch-repair-deficient and microsatellite-instability-high (dMMR/MSI-H) derive benefit from immunotherapy; however, the vast majority of patients with proficient MMR (pMMR) or with microsatellite stable (MSS) CRC do not. Immunoscore and the consensus molecular subtype classifications are promising biomarkers in predicting therapeutic efficacy in selected CRC. In pMRR/MSS CRC, biomarkers are also needed to understand the molecular mechanisms governing immune reactivity and to predict their relationship to treatment. The continuous development of such biomarkers would offer new perspectives and more personalized treatments by targeting oncological options, including ICIs, which modify the tumour-immune microenvironment. In this review, we focus on CRC and discuss the current status of ICIs, the role of biomarkers to predict response to immunotherapy, and the approaches being explored to render pMMR/MSS CRC more immunogenic through the use of combined therapies.
There is no best method for constructing size-transition matrices for size-structured stock assessments
Authors: Cronin-Fine Lee , Punt André E
Published: October 2019

Stock assessment methods for many invertebrate stocks, including crab stocks in the Bering Sea of Alaska, rely on size-structured population dynamics models. A key component of these models is the size-transition matrix, which specifies the probability of growing from one size-class to another after a certain period of time. Size-transition matrices can be defined using three parameters, the growth rate (k), asymptotic size (L∞), and variability in the size increment. Most assessments use mark-recapture data to estimate these parameters and assume that all individuals follow the same growth curve, but this can lead to biased estimates of growth parameters. We compared three approaches: the traditional approach, the platoon method, and a numerical integration method that allows k, L∞, or both to vary among individuals, under a variety of scenarios using simulated data based on golden king crabs (Lithodes aequispinus) in the Aleutian Islands region of Alaska. No estimation method performed best for all scenarios. The number of size-classes in the size-transition matrix and how the data are generated heavily dictate performance. However, we recommend the numerical integration method that allows L∞ to vary among individuals and smaller size-class widths.
Determination of Specific Absorbance (A¦) for Six Psychoactive Drugs Encountered in Forensic Toxicology
Authors: Tran Cat-Van , Vargas Jay R
Published: October 2019

Specific absorbance (A¦) is defined as the maximum absorbance of a 1% solution over a 1-cm path length measured via spectroscopy. Finding a reliable value for specific absorbance for a drug provides an important tool for the quantitative verification of concentration of analytical standards. Although many new drugs have emerged within the last ten years, many either do not have a reliable value for A¦, or a value simply has never been published. This work focused on determining the quantitative value of the specific absorbance of six psychoactive drugs using ultraviolet-visible spectroscopy, as well as comparing A¦ values of drugs purchased in 2017 to A¦ of their counterparts purchased in 2019. The drugs analyzed included Iloperidone, Risperidone, Aripiprazole, Vilazodone, Vortioxetine and Suvorexant.
The effect of non-fiscal clauses in Host Government Instruments on the Fair Market Value of upstream opportunities
Authors: Moore Christopher Robertson Kinley , Moyes Christopher Peter , Patterson Paul Dee
Published: October 2019

We identify nine categories of clauses in Host Government Instruments (HGIs, ie licences, concessions, production sharing contracts (PSCs), etc.) that potentially affect the Fair Market Value of petroleum exploration and production rights, in addition to the clauses quantifying the fiscal terms. The categories comprise state participation, performance bonds and penalties for failing to perform minimum work programmes, local content, decommissioning, natural gas terms, stabilization, assignment and change of control, renewals and extensions and governance issues. For each category, we review and summarize global practice in the top 50 oil-producing countries. We quantify our analysis using statistics from a data set of 55 representative HGIs, including contemporary alternative types for five countries. The age of each HGI used varies, guided by the history of oil production in each country. Texts are available for 53 HGIs and published summaries are available for the other two. The discussion provides a checklist for use in negotiating new HGIs or performing due diligence for transactions involving existing HGIs. Our choice of representative HGIs and our characterizations of some clauses are both in part subjective. Nevertheless, we suggest the statistics provide a useful guide to trends in global practice.
Bondi–Hoyle–Lyttleton accretion by binary stars
Authors: Comerford T A F , Izzard R G , Booth R A , Rosotti G
Published: October 2019

Binary stars often move through an ambient medium from which they accrete material and angular momentum, as in triple-star systems, star-forming clouds, young globular clusters, and in the centres of galaxies. A binary form of Bondi–Hoyle–Lyttleton accretion results whereby the accretion rate depends on the binary properties: the stellar masses and separation, and the relative wind speed. We present the results of simulations performed with the hydrodynamic code gandalf, to determine the mass accretion rates over a range of binary separations, inclinations, and mass ratios. When the binary separation is short, the binary system accretes like a single star, while accretion on to stars in wide binaries is barely affected by their companion. We investigate intermediate-separation systems in some detail, finding that as the binary separation is increased, accretion rates smoothly decrease from the rate equal to that of a single star to the rate expected from two isolated stars. The form of this decrease depends on the relative centre-of-mass velocity of the binary and the gas, with faster-moving binaries showing a shallower decrease. Accretion rates vary little with orbital inclination, except when the orbit is side-on and the stars pass through each others’ wakes. The specific angular momentum accretion rate also depends on the inclination but is never sufficient to prevent the binary orbit from contracting. Our results may be applied to accretion on to protostars, pollution of stars in globular and nuclear clusters, and wind mass transfer in multiple stellar systems.
To use or not to use synthetic stellar spectra in population synthesis models?
Authors: Coelho Paula R T , Bruzual Gustavo , Charlot Stéphane
Published: October 2019

Stellar population synthesis (SPS) models are invaluable to study star clusters and galaxies. They provide means to extract stellar masses, stellar ages, star formation histories, chemical enrichment, and dust content of galaxies from their integrated spectral energy distributions, colours, or spectra. As most models, they contain uncertainties that can hamper our ability to model and interpret observed spectra. This work aims at studying a specific source of model uncertainty: the choice of an empirical versus a synthetic stellar spectral library. Empirical libraries suffer from limited coverage of parameter space, while synthetic libraries suffer from modelling inaccuracies. Given our current inability to have both ideal stellar-parameter coverage with ideal stellar spectra, what should one favour: better coverage of the parameters (synthetic library) or better spectra on a star-by-star basis (empirical library)? To study this question, we build a synthetic stellar library mimicking the coverage of an empirical library, and SPS models with different choices of stellar library tailored to these investigations. Through the comparison of model predictions and the spectral fitting of a sample of nearby galaxies, we learned that predicted colours are more affected by the coverage effect than the choice of a synthetic versus empirical library; the effects on predicted spectral indices are multiple and defy simple conclusions; derived galaxy ages are virtually unaffected by the choice of the library, but are underestimated when SPS models with limited parameter coverage are used; metallicities are robust against limited HRD coverage, but are underestimated when using synthetic libraries.
Self-Care Practices of Self-Identified Social Workers: Findings from a National Study
Authors: Miller Jay J , Grise-Owens Erlene , Owens Larry , Shalash Nada , Bode Molly
Published: October 2019

Self-care can be an important tool in assuaging professional burnout, workplace stress, vicarious or secondary trauma, and other deleterious employment circumstances. Despite this importance, few studies have examined self-care among social work practitioners. This exploratory study examined the self-care practices of self-identified social workers (N = 2,934) throughout the United States. Primary data were collected with an electronic survey. Data indicate that social workers in the sample engage in moderate self-care practices. Analyses revealed group differences in self-care by several variables including geographic locale of participants’ primary place of employment, race, educational level, and social work licensing status, among others. Significant predictors of self-care included perceived health status (self-report), education level, being a supervisor, and financial status. Overall, findings from this study indicate the need for a systemic response to improving self-care practices among social workers.
Sexual Dysfunction in the ‘Eden of Love’: Psychosocial Responses to Impotence in British First World War Veterans
Authors: Johnson Bethan
Published: October 2019

Contemporary estimates and more recent research into the correlation between military service and sexuality suggest that, among the millions of men returning to Great Britain following combat in the First World War, more than half a million had sustained physical or psychological injuries that would have rendered them sexually impotent. Many studies have addressed war disabilities, unstable masculinities, and changing sexual mores in the British interwar period; however, the impotent Great War veteran, the embodiment of all three of these phenomena, has remained on the fringes of historical analysis. This article recovers the subjective experiences of Great War veterans who were made impotent as a result of their combat service, using the written records many left behind. These testimonials reveal a strong negative affectivity and sense of isolation in impotent veterans due to their condition, despite its prevalence. The article uses works from popular science, literature, and film to demonstrate how the convergence of historic prejudice against impotent men and mounting pressures placed on sexual performance and the ability to reproduce induced this internal turmoil, an anxiety unique to impotent combat veterans. By exploring impotent veterans’ attempts to reconcile themselves to their condition, this article provides insights into the instability of masculinity, diversifies historical articulations of wartime disabilities, and complicates narratives about revolutionary sexual change in interwar British society.