bluuebunny/crossref_metadata_2025 huggingface dataset:
ANALISIS PENDAPATAN PETERNAKAN AYAM BROILER POLA KEMITRAAN DI KECAMATAN GUNUNG PATI SEMARANG
Authors: Cahyaningtyas N P , Prasetyo Edy , Sarengat W
Published: April 2020

Penelitian ini bertujuan untuk mengidentifikasi penggunaan faktor-faktor produksi (meliputi jumlah DOC, pakan ternak, tenaga kerja, listrik dan vaksin) menghitung biaya, penerimaan, dan pendapatan serta, menganalisis pengaruh faktor-faktor produksi terhadap pendapatan usaha ternak ayam broiler pola kemitraan di Kecamatan Gunungpati Kota Semarang. Metode penelitian yang digunakan adalah survey. Survey yaitu penelitian yang mengambil sampel dari populasi dan menggunakan kuesioner sebagai alat pengumpulan data. Pengambilan sampel menggunakan Random Sampling dan pengumpulan data dalam penelitian ini menggunakan observasi dan wawancara dengan bantuan kuisioner. Analisis pengujian ini dilakukan dengan uji regresi linier berganda. Hasil dari penelitian menunjukkan biaya produksi paling tinggi diperoleh peternak dari PT Mustika yaitu sebesar Rp.1.603.339.108,- per seribu ekor, PT Malindo Rp. 148.813.906,- per seribu ekor, PT Umi Perkasa Rp. 170.429.177,- per seribu ekor, PT HBS Rp. 67.759.535,- per seribu ekor. Sedangkan jumlah pendapatan tertinggi di peroleh peternak PT Mustika sebesar Rp. 275.497.310,- sedangkan pendapatan terendah diperoleh peternak PT Malindo sebesar Rp. 242.293.518,-. Secara keseluruhan rerata pendapatan per tahun peternak di Kecamatan Gunungpati mencapai Rp 266.876.566,-. Secara serempak variabel-variabel jumlah DOC, tenaga kerja, pakan, listrik dan vaksin berpengaruh signifikan terhadap variabel dependen pendapatan. Secara parsial hanya variabel jumlah DOC yang berpengaruh signifikan terhadap variabel pendapatan. Sedangkan variabel tenaga kerja, pakan, listrik dan vaksin berpengaruh tidak signifikan terhadap variabel pendapatan.

Kata kunci : Ayam broiler, Biaya Produksi, Pendapatan.
PENGARUH PENGGUNAAN SILASE PAKAN KOMPLIT BERBAHAN ECENG GONDOK TERHADAP KECERNAAN PROTEIN PADA DOMBA
Authors: Hanun L , Muktiani A , Nuswantara L K
Published: April 2020

This study aims to determine the effect of fedding a complete ration of silage made from water hyacinth on concentration of ammonia rumen, total protein of rumen fluid and protein digestibility. Fifteen rams with average body weight of 19 ± 3.98 kg used on this research. The experiment was arranged in 3x5 randomized completed design. There treatment were T1= concentrate and elephant grass, T2= complete feed silage contained water hyacinth without L. plantarum starter addition, and T3= complete ration silage contained water hyacinth added with L. plantarum. Ration was formulated by isoenergy and isoprotein feed (CP 13%, TDN 65%). Feed treatment was given for 12 weeks. The results showed that the consentration of ammonia rumen was different (P0,05). Concentration of ammonia rumen of T1, T2 and T3 as follows: 2,53, 2,04, 1,80 mM. Total protein of rumen fluid and protein digestibility ranged by 295,70-381,04 mg/g and 75,00-77,29%. The conclusions of this study were the provision of complete feeding silage either without or with the addition of L. plantarum starter to produce the same digestible protein as conventional ration (concentrate and elephant grass).

Keywords : silage, water hyacinth, protein, digestibility, sheep.
STRATEGI PENGEMBANGAN USAHA KERAJINAN TANGAN SABUT KELAPA DI LKP AKAS KABUPATEN KEBUMEN
Authors: Andari Yunida Tri , Sasongko Lutfi Aris , Nurjayanti Eka Dewi
Published: April 2020

Cocunut coir, as a secondary product of coconut, can be processed into eco-friendly fiber. This fiber is used as raw materials for handicrafts. This research aims to analyze the internal and external factors, as well as formulating an alternative strategy for the development of coconut coir handicraft business in LKP AKAS Kebumen Regency. The data used primary and secondary type. Data analysis method is done by using Internal Factors Evaluation (IFE) matrix, External Factors Evaluation (EFE) matrix, Internal External (IE) matrix and SWOT matrix. Data analysis resulted internal factors (strenghts) including abundant availability of raw materials, availability local labor, short marketing channels, national and international marketing. In the other hand, internal factors (weakness) are including lack of product innovation, an effective organizational structure, old manpower, an availability recorded orders, and lack of promotion through the website and social media. The external factors (opportunity) including the partnership with raw materials suppliers, the steadiness of raw material prices and repeated orders, the lack of competitors with the same materials, the supports from local government, and the request of delivery orders. In the other hand, the external factors (threaths) are including the risk of the market (numerous kind of handicraft with different materials), and the presence of other handicraft industry. The result of IE analysis, LKP AKAS is located in zone I, i.e grow and build. Suitable strategies for this area are market penetration, market development, and product development. Alternative strategies that can be done are: (1) make a business plan including production layout, product variation (production) and marketing to add customers; (2) summarize and manage the customer’s orders in order to have regular evaluation of the business progress in the future; (3) modified the product becomes more varied in order to be able to compete with other handicraft products; and (4) increase promotional activities online (website and social media) to attract consumers.

Keywords : development strategy, handicraft, coconut coir, SWOT, Kebumen.
TEKNIK PEMANGKASAN TANAMAN KOPI (Coffea sp)
Authors: Subantoro Renan , Aziz Mukhamad Abdul
Published: April 2020

Production of smallholder coffee crops is not maximal because the crop maintenance factors are mostly in terms of proper pruning techniques. Through this article, it is hoped that the information and field experience of coffee cropping techniques needed by smallholder coffee farmers will need to increase the production of coffee produced by the good quality of the coffee produced. The purpose of trimming coffee crops is to improve the shape of the tree, improve quality and production, and facilitate maintenance and harvesting. The writing method of this paper was compiled by examining various literature and field assessments of coffee crop trimming techniques to improve the quality of coffee production. As a result of the study in this paper: Trimming forms for coffee crops so that strong crops and crops are balanced in forming Plagiotropic branches, both primary and secondary branches. It should be noted is how to treat the coffee crop itself to support the success of cultivation. Maintenance pruning activities are basically aimed at maintaining the continuity of the plant skeleton obtained from pruning the form by removing unproductive branches.

Keywords: coffee, maintenance, form of pruning.
PENGARUH PEMBERIAN TEPUNG KIAMBANG (Salvinia molesta) DENGAN ADITIF MULTIENZIM DALAM RANSUM TERHADAP PERFORMANS ITIK TEGAL
Authors: P Sinaga R , Suprijatna E , Kismiati S
Published: April 2020

ABSTRACT

The research aims to determine the influence of using Salvinia molesta with multienzyme additive in rations of tegal duck performans. This research uses 72 Tegal female ducks 22 weeks old. Feed ingredients used in the reasearch consisted of corn, soybean meal, oil, bran, fish meal, premix, methionine, lysine, Salvinia molesta and multienzyme additives. The reasearch was conducted with Completely Randomized Design with 6 treatments and 4 replications of the study. Each experimental unit consists of 3 ducks. Ransum namely: T0: feed without Salvinia molesta and enzyme; T1: feed without Salvinia molesta + multienzim; T2: feed with Salvinia molesta. 5% + without multienzymes; T3: feed with Salvinia molesta. 5% + multienzim; T4: feed with Salvinia molesta. 7,5% + multienzim; T5: feed with Salvinia molesta. 10% + multienzim. The result showed no significant treatment (P> 0,05) to consumtion of ration, feed conversion and Tegal duck eeg weightbut have an effect on hen day production (P
Educational Evaluation of the Federal University of Latin American Integration, Brazil
Authors: Diaz-Villavicencio Guillermo
Published: April 2020

Purpose: Analyzes satisfaction with the Federal University of Integration of Latin America (UNILA). Focused on the development of a new educational scheme in Latin America, being a university more open to change, multicultural, bilingual and Latin American.

Methodology: the institutional evaluation quantitative methodology would be applied by the multidimensional method, being able to contemplate all the specificities of the academic community.

Findings: This study answers four hypotheses that are within the four large educational dimensions evaluated. The results show that there are around 62% of satisfaction throughout the university, but they also indicate a concern for international, social and educational cooperation.

Research Limitation: The main limitation of the investigation is related to the period of time considered (one year). Therefore, it is recommended to verify the results obtained in this study, carrying out a longitudinal investigation (considering more years).

Originality: We generated a model that is oriented towards a generic measurement of satisfaction and it was builted considering the four distinguishing dimensions required by Educational Minister. All results were analyzed in a linear regression econometric model that were show us the level of significance of each question.

KEYWORD: Multicultural education, evaluation technique, multidimensional analysis, regression econometric model, Reliability and validity.
“La ilusión de la identidad”: el actual debate europeo
Authors: Redacción Consejo de
Published: April 2020

El debate sobre las identidades hoy es permanente, a veces confuso. La discusión gira en torno a identidades nacionales o sobre la identidad europea, a propósito de identidades religiosas o sobre símbolos, alrededor de identidades étnicas o sobre valores cívicos La cuestión es compleja y tiene una fuerte carga emocional; resulta difícil una aproximación simplemente racional. La cuestión de las identidades sirve con frecuencia para la confrontación entre identitarismos. Entonces se produce la ilusión de las identidades. Éstas, recreadas o simplificadas al máximo, sirven para defender y promover nuestra visión del mundo o, tantas veces, nuestros intereses. Revista de Fomento Social prefiere hablar de identidades complejas como base de la ética cívica para nuestras sociedades europeas. Nos hemos hecho la pregunta sobre la pertinencia de este debate. Pretendemos describir e interpretar lo que pasa y aportar algún criterio que aclare los conceptos a partir del de frontera y de la explicación sobre la construcción de una identidad. En la parte propositiva ensayamos una exposición sobre algunas propuestas para el diálogo sobre lo que es realmente importante y lo que pueden ser inútiles e interesadas discusiones. En resumen, si no se sitúa en el trasfondo de un cambio mayor en que están inmersas nuestras sociedades, creemos que el debate sobre las identidades puede ser una ilusión. Vivimos en un proceso permanente de construcción de identidades complejas.
OPTIMAL STRIP LAYOUT OF IRREGULAR SHAPES CUTTING FROM RECTANGULAR SHEET
Authors: Tran Bong Dang , Pham Tuan Ngoc , Tran Nguyen Dai , Ho Tuan Minh
Published: April 2020

This article deals with optimal nesting problem when parts are cut from rectangular sheet in the footwear industry. The objective of the research is minimizing the waste of material or maximizing the number of parts to be cut from sheet materials. By generating the mathematical models and building up their algorithms, the software for solving problem dedicates to a number of industries for saving time and minimizing waste of material, and increasing the cutting productivity.
ONE SAFE MODEL OF THREEWHEEL MOTORBIKE FOR INVALID
Authors: Nguyen Huong Huu , Nguyen Hung Dinh , Hong Thong Duc
Published: April 2020

The paper introduces one safe model of threewheel motorbike for the handicapped. The new model ensures the users ability to work, commute, and join road traffic.
APPLYING WAVELET METHOD FOR DENOISING IN TIME SERIES
Authors: To Dzung Anh , Hoang Ha Van
Published: April 2020

This paper presents an application of the Wavelet Method to denoise in time series gives a compare with a traditional Fourier method, using the discrete transform. The key point of this method is choosing a wavelet function to estimate the variance of noise and determining the threshold. Moreover, we study some measures of the error and effectiveness among noise-suppression methods.
USING REMOTE SENSING AND GIS TO IDENTIFY TREND OF EXPANSION OF URBAN AREA IN HOCHIMINH CITY
Authors: Pham Viet Bach
Published: April 2020

Studying on the trend of spatial expansion of urban in Hohiminh city, which used remote sensing and spatial analysis of GIS, has revealed changes of spatial urban over times.. Analysis of spectral response for main land cover types had been done on Landsat data from 1975 to 2005 in order to discriminate urban type with the others. Based on this spectral analysis, the expansion of urban area over times has been identified. Spatial statistics analysis was applied to estimate trends of urban area of Hochiminh city. Tthe results showed a wide spreading out from 1975 to 2008, the urban area has been extended two times in radius and three times in area. The trends of spatial expansion is anisotropic. There is a spatial expansion trend in the north east-south west axis.
FACTORS INFLUENCING STATE OFFICERS’ INTENTION TO LEAVE JOBS
Authors: Vo Hung Quoc , Cao Thi Hao
Published: April 2020

The research aims to identify factors influencing State officers’ intention to leave jobs. The analysis is based on 277 questionnaires collected from 900 ones delivered. The survey found 8 factors influencing State officers’ intention to give up jobs including Person-Organisation fit; Leadership Behaviour; Team Relationship; Training and career Development; Remuneration and Recognition; Communication; Fondness and Physical working Environment which have negative relationship and statistical meanings. Given the fact by such result, these factors accounted for 35,9% of the variation of dependent variant Intention to leave jobs.
FACTORS INFLUENCING JOB CHOICE DECISIONS IN STATE-OWNED ENTERPRISES
Authors: Tran Duyen Thi Ngoc , Cao Thi Hao
Published: April 2020

The objective of this study is to identify factors influencing job choice decisions in state-owned enterprises (SOEs), basing on researches developed by Timothy A. Judge and colleagues [3, [4], [5], [10] , David G. Allen, Raj V. Mahto and Robert F. Otondo [7], Levon T. Esters and Blannie E. Bowen [8]. Results are based on data surveyed on 253 job-seeker participants who graduated from junior colleges, universities or postgraduate programs in HCM City and have the intention to pursue employment in a state-owned company. The results indicated 8 main factors influencing job choice decisions in the state-owned enterprises including training and promotional opportunities, organizational prestige and brand, person-organisation fit, pay levels, pay systems, policies and working environment, policies and information recruitment, parents and friends. All key factors had significant positive relationship with job choice decisions in state-owned enterprises at the statistically significant level of 5%. Research models accounted for 47,9% for the overall dependence of the eight above-mentioned factors on job choice decisions in state-owned enterprises.
LIBRARY SERVICE QUALITY A COMPARISON BETWEEN THE TECHNICAL/FUNCTIONAL QUALITY AND SERVQUAL
Authors: Nguyen Trang Thi Mai , Tran Huong Xuan Thu
Published: April 2020

The aim of this study is to compare two models of service quality, technical/functional quality and SERVQUAL in university library services to find out the best library service model which pleases students most. Two proposed models were tested with 347 students at the Faculty of Economics, University of Technology, and University of Natural Sciences, Vietnam National University – Ho Chi Minh City. The results show that SERVQUAL is better than the technical/functional quality model. Therefore, SERVQUAL is chosen to evaluate the quality of library services. The results also show that SERVQUAL consists of only two components: caring service and tangibles, in which caring service has a stronger effect on students’ satisfaction.
DETERMINATION OF FOILS THICKNESS BY ALPHA SPECTROSCOPY
Authors: Le Hao Cong , Mai Nhon Van , Chau Tao Van
Published: April 2020

Nowadays, in both industry and scientific research, there has been a demand for determination of matters thickness. In this article we will bring out two methods which are very simple, fast, effective and low-cost in getting exactly thickness of thin foils (pm). Both two these methods are based on energy loss of alpha particle when it passed through foil and then detected by high energy resolution alpha spectroscopy.
MODIFICATION OF ANATASE TiO2 WITH KF AND ITS PHOTOCATALYTIC ACTIVITY IN VISIBLE REGION
Authors: Huynh Xuan Thi Kieu , Le Khoa Tien , Tang Thuy Ngoc Bao , Nguyen Hung Huu Khanh
Published: April 2020

In this study, we searched for methods to modify commercial titania in pursuit of new low cost photocatalyst which can operate effectively under visible irradiation. Mixtures of TiO2 and KF were calcined in the region of 800 - 1000°C at different calcine duration to obtain FTO. XRD data indicated the existence of 3 phases K2Ti6013, K4Ti4F10O6.3H20 and anatase. SEM photographs revealed that initial TiO2 particles (TO) had distorted cubic shape and their size ranged from 100 to 500 tun. While FTO particles had cylindrical form of more 1 μm in length. Under visible irradiation, photoactivity of FTO on blue methylene decomposition is equivalent to P25 (conversion 60% after 4 hours) and double TO.
ACOUSTIC PROPERTIES OF INDIAN MACKEREL (RASTRELLIGER KANAGURTA), YELLOWTAIL SCAD (ATULE MATE) AND JAPANESE SCAD (DECAPTERUS MARUADSI) BASED ON FREQUENCY RESPONSE ANALYSIS
Authors: Vu Ha Viet
Published: April 2020

Multi-frequency acoustic data collected during ex situ target strength measurements in Catba Island, Vietnam was used to calculate frequency response for Japanese scad, Indian mackerel and Yellowtail scad. Total of 168 echotraces of Yellowtail scad, 291 of Japanese scad and 53 of Indian mackerel were generated for frequency response analysis. Results indicated significantly different in r(f) of three species (Post Hoc Tukey Test, p < 0,001). A discriminant function analysis used frequency response at 38, 120 and 200 kHz and backscattering cross section at 38 kHz as independent variable was able to differentiate between species. Approximatly of 87% echotraces of these species was classified correctly. Frequency responses at 38 kHz, 120 kHz and backscattering cross section at 38 kHz were the most important independent variables. This study revealed that Japanese scad, Yellowtail scad and Indian mackerel could be identified acoustically; a finding may be important for acoustic surveys for small pelagic fish in Vietnam.
THAI – US SECURITY RELATIONS IN THE PERIOD OF THE COLD WAR – A CONCEPTION
Authors: Nguyen Dung Ngoc
Published: April 2020

Among all the alliances of the US in the Cold War, Thailand played an essential role being considered an entrenched fortification and outpost in Southeast Asia to prevent the expansion of Communism. Therefore, Thai-US security relations observed from outside resembles a sort of ideological alliance. Thailand would be regarded as an Asian nation “following the tail of the US” and serving for American strategic security aims in Southeast Asia, and benefiting itself on it. However, the cognitive situation would be not that simple if Thai-US security relations in the cold war were thoroughly researched into. The paper offers a historical overview on Thai-US security relations, especially in the Cold War to evaluate or discuss the nature of these relations; to understand if they are patron-client relationship between a superpower and a humble nation, ideological alliance or any other kind of international relation. The paper is divided into four main sections reflecting the author’s particular point of view.
RESEARCH IN PRODUCING READY-TO-EAT PRODUCTS FROM PINK SALMON (Oncorhynchus gorbuscha) FILLETS
Authors: Nguyen Duy Xuan , Crapo Chuck , Oliveira Alexandra , Do Son Trong
Published: April 2020

While frozen and canned products from salmon have been familiar with consumers, demand for new product development with nutritional quality and convenient for usage from this fish specie is being expected. This article presents experimental research results in producing ready-to-eat products from salmon fillets using Freeze Dryer Virtis. The suitable flavoring recipe for producing freeze dried cubers as snack as follows: salmon pieces of 10 X 10 X 10 (mm) are treated throught two flavoring solutions including hot bath (HB) at 60°C for 5 min and cold bath (CB) at 0°c for 30 min. HB consists of salt 2% (w/v), sugar 2% (w/v), fish sauce 2% (v/v), garlic powder 0.1% (w/w) and onion powder 0.1% (w/w) and CB contains salt 0.5% (w/v), sugar 1% (w/v), fish sauce 2% (v/v), garlic powder 0.1% (w/w) and onion powder 0.1 % (w/w). Ratio between weight of salmon meat and flovoring solution is 1:2 (w/v). Freze dried salmon product produced according to above formula had acceptable quality level for consumption.
Numerical investigation of the thermocapillary migration of a water droplet in a microchannel by applying a heat source
Authors: Thanh Long Le , Chen Chen Jyh , Huy Bich Nguyen
Published: April 2020

The migration of a small droplet has been developed during the last two decades due to its applications in industry and high technology such as MEMS and NEMS devices, Lap-On-a- chip, transportation of fluids and so on. There have many studies on this topic in which the energy source as a driving force for the moving of a droplet is quite a difference like heating, magnetics, pressure, electric, laser, and so on. In this study, the numerical computation is used to investigate the transient thermocapillary migration of a water droplet in a micro-channel under the effect of heating source. For tracking the evolution of the free interface between two immiscible fluids, we employed the finite element method with the two-phase level set technique to solve the Navier-Stokes equations and continuity equation coupled with the energy equation. Both the upper wall and the bottom wall of the microchannel are set to be ambient temperature. 40mW heat source is placed at a distance of 1 mm from the initial position of a water droplet. When the heat source is turned on, a pair of asymmetric thermocapillary convection vortices is formed inside the droplet, and the thermocapillary on the receding side is smaller than that on the advancing side. The temperature gradient inside the droplet increases quickly at the initial times and then decreases versus time. Therefore, the actuation velocity of the water droplet first increases significantly and then decreases continuously. Furthermore, the results also indicate that the dynamic contact angle is strongly affected by the oil flow motion and the net thermocapillary momentum inside the droplet. The advancing contact angle is always larger than the receding contact angle during the actuation process.
Adaptive multilayer T-S fuzzy controller for nonlinear SISO system optimized by differential evolution algorithm
Authors: Van Kien Cao , Pham Huy Anh Ho , Ngoc Son Nguyen
Published: April 2020

In this paper, the authors propose a novel adaptive multilayer T-S fuzzy controller (AMTFC) with an optimized soft computing algorithm for a class of robust control uncertain nonlinear SISO systems. First, a new multilayer T-S fuzzy was created by combined multiple simple T-S fuzzy models with a sum function in the output. The multi-layer fuzzy model used in nonlinear identification has many advantages over conventional fuzzy models, but it cannot be created by the writer's experience or the trial and error method. It can only be created using an optimization algorithm. Then the parameters of the multilayer fuzzy model are optimized by the differential evolution DE algorithm is used to offline identify the nonlinear inverse system with uncertain parameters. The trained model was validated by a different dataset from the training dataset to guarantee the convergence of the training algorithm. Second, for robustly and adaptive purposes, the authors have proposed an additional adaptive fuzzy model based on Lyapunov stability theory combined with the optimized multilayer fuzzy. The adaptive fuzzy based on the sliding mode surface is designed to guarantee that the closed-loop system is asymptotically stable has been proved base on a Lyapunov stability theory. Furthermore, simulation tests are performed in the Matlab/Simulink environment that controlling a water level of a coupled tank with uncertain parameters are given to illustrate the effectiveness of the proposed control scheme. The proposed control algorithm is implemented in simulation with many different control parameters, and it is also compared with the conventional adaptive control algorithm and inverse controller. The simulation results also show the superior of the proposed controller than an adaptive fuzzy control or inverse controller when using the least mean square error standard.
Bond-Graph based simulation of sensors and piezoelectric beams’ ranges in the energy recovery circuit
Authors: Quang Thien Duong , Thi Hai Van Nguyen
Published: April 2020

Currently, with the disappearance of fossil energy sources, finding new alternative energy sources is very necessary, such as solar energy, wind energy, tidal energy, flow energy... However, these energy sources require high investment capital, large capacity, and bulky size. In circuits requiring small power sources (below 12V), it is not applicable, or only used through intermediate devices such as transformers, current transformers; Therefore, the application of energy from mechanical vibration has been proposed as an optimal measure compared to the above methods. Energy recovery from mechanical vibration is the activity of reusing a part of the energy generated when there is a fluctuation with a constant frequency on solid surfaces. Mechanical vibrations occur mostly in production systems, and it also causes some damage. However, we can take advantage of these mechanical vibrations to cater to some basic life requirements if they have the right vibration frequency and amplitude, or we can adjust to have optimal vibration conditions. This article uses an intermediate control circuit to convert the energy generated by mechanical vibration into electrical energy (current and voltage), in which the piezoelectric sensors or piezoelectric beam are placed on the structures to be measured, we will receive oscillations at different frequencies so that we can analyze the damage caused by vibration and evaluate the application range of piezoelectric sensors and piezoelectric beam on a case-by-case basis. The purpose of the paper is to study a constant frequency energy recovery circuit to create some initial parameters, then use a Bond-Graph to optimally simulate this energy recovery process. This is also a very good solution for generating energy for the SHM system from other mechanical energy sources.
Optimal dynamic routing for two forklifts in narrow-Aisle racking warehouse
Authors: Cuong Truong Ngoc , Giang Dang Truong , Anh Nguyen Duy
Published: April 2020

Determining storage location and planning path are the two most important components in warehouse management. Simultaneous resolution of these problems not only reduces the storage and retrieval time but also avoids the loss of goods. The article offers a scenario of a practical cold warehouse system with narrow aisle racking, where space optimization and time schedules are always the top priority. There are two forklifts considered to work parallel in the system, so aisle dispute is considered to minimize safety risks in the warehouse. Two algorithms used to optimize the path were introduced in the paper, which is the closest open location – COL and A star algorithm. The COL helps to determine the most appropriate storage location according to the user's requirements, including the type of goods to be exported or imported, finding storage location of the nearest empty cell by referring the weight of the road and obstacle might happen by two forklift truck in the system. The result of this algorithm is the determined Input and Output point of each forklift path. The coordinate index ​​of these two points is returned as input to the A-star algorithm to determine the shortest path for the forklift. With the A star algorithm, a clear path will be sought, including the comparison of clashes between vehicles in the system, preferring the shortest path for moving between two points. The travel route results are exported for goods execution devices. The system is simulated by MATLAB combined with V-Rep software for an intuitive interface and fully illustrates each task of each vehicle from time to time. Some traditional or single algorithms with the same assumptions about the system were also simulated and compared to see the effectiveness of the combination of two COL and A star algorithms in a narrow aisle racking system.
GPS/INS Integrated Navigation System for Autonomous Robots
Authors: Ngoc Huy Tran , Manh Cam Le , Thanh Nam Nguyen
Published: April 2020

Nowadays, autonomous robots are capable of replacing people with hard work or in dangerous environments, so this field is rapidly developing. One of the most important tasks in controlling these robots is to determine its current position. The Global Positioning System (GPS) was originally developed for military purposes but is now widely used for civilian purposes such as mapping, navigation for land vehicles, marine, etc. However, GPS has some disadvantages, like the update rate is low or sometimes the satellites’ signal is suspended. Another navigation system is the Inertial Navigation System (INS) can allow you to determine position, velocities, and attitude from the subject’s status, like acceleration and rotation rate. Essentially, INS is a dead-reckoning system, so it has a huge cumulative error. An effective method is to integrate GPS with INS, in which the center is a nonlinear estimator (e.g., the Extended Kalman filter) to determine the navigation error, from which it can update the position the object more accurately. To improve even better accuracy, this paper proposes a new method that combines the original integrated GPS/INS with tri-axis rotation angles estimation and velocity constraints. The experimental system is built on a low-cost IMU with a tri-axis gyroscope, accelerometer, and magnetometer, and a GPS module to verify the model algorithm. Experiment results have shown that the rotation angles estimator helps us to determine the Euler angles correctly, thereby increasing the quality of the position and velocity estimation. In practice, the accuracy of the roll and pitch angle is 2 degrees; the error of the yaw angle is still large. The achieved horizontal accuracy is 2m when the GPS signal is stable and 3m when the GPS signal is lost in a short period. Compared with individual GPS, the error of the integrated system is about 10% smaller.
Design and fabrication of wave generator using an oscillating wedge
Authors: Thi Yen Vu Lu , Phuong Ha , Xuan Thinh Ho , Thanh Liem Dao , Quoc Thanh Truong , Doan Son Tran
Published: April 2020

This paper describes the design and fabrication of a wave flume and associated equipment. The water wave generation by a triangle wedge is examined in this paper. Wave flume is fabricated by a concrete flume, which is 0.75-meter-wide, 1.3-meter-tall, and 11 meters long. One side of the flume is made of concrete, and the other side is made of clear mica sheets for observe the water wave profile. Wave flume is equipped with a triangle wedge located at one end of the wave flume, and this triangle wedge can be move along the rail of the wave flume. The passive wave absorber, which is made of honeycomb, which is located at the other end of the wave flume for absorbing energy waves generated from the wavemaker. The wedge is controlled by a desktop computer through Matlab software. The wedge can be controlled move up and down at a prescribed speed and oscillation amplitude corresponding to the desired wave height and wave frequency. At the middle flume is equipped microlaser distance sensor, which provides the data-logging capability. The microlaser distance sensor can collect wave height and wave period through a small ball, which is motioned in the tube, which is assembled on the water surface, and the small ball is very slight to avoid kinetic inertia energy. At the wavemaker is equipped with an Eccentricity Sensor, which is used to measure the wedge position to feedback for a desktop computer. Wave flume can generate the largest waves are about 0.2 meter high,  a period about 1 second, and a wavelength of about 1.5 meters. The waves generated by an oscillating wedge have been measured, analyzed to consider the generated wave energy.
Researching on hybrid friction stir welding between two differential materials as steel and aluminium
Authors: Minh Nhat Truong , Quoc Thanh Truong , Trong Quyet Tran , Phuong Minh Luu
Published: April 2020

Friction stir welding exploits its solid-state process behavior to join aluminum to steel, which differs in thermal and mechanical properties, and where a combination of these metallic alloys by fusion welding prompts a deleterious reaction as a result of the melting and resolidification phases. Recently, hybrid techniques have been employed in FSW for several materials and alloys, particularly for steel–steel joining. These methods are generally aimed to pre-heat the steel plate materials. This study presents conducted heat simulations and experimental jointing flat-plate of aluminum alloy 6061 and SUS 304. Temperature is simulated by the COMSOL software in three states: (1) Preheat the Friction Stir Welding (FSW) by TIG welding, (2) Thermal contact resistance between aluminum and steel, and (3) The welding process using stirring friction is simulated. The simulations intended to predict the temperature, which is used for the preheating and welding process to ensuring the required solid-state welding. The temperature is also determined and checked by a thermal imager comparing with simulation results. Besides, the results of tensile strength are carried out. The Box - Behnken method is used to identify the relationship between the welding parameters (rotation, speed, and offset), temperature, and tensile strength. The maximum tensile strength is 77% compared to the strength of the aluminum alloy. The optimal set of parameters for the process is n = 676 rpm, v = 46 mm / min and x = 0.6 mm. The optimizing welding parameters to achieving a good quality of the welding process are described. SEM images to determine some properties of welding materials. This is also the basis for initial research to identify some defects in the welding of two different materials (IMC thickness and interconnected pores) and the cause of these defects.
A research on the design a bamboo powder drying machine
Authors: Van Hung Tran , Khanh Dien Le , Tuyen Vo
Published: April 2020

Bamboo is a sustainable and environmentally friendly material that has the potential to improve the global decline of natural resources. Bamboo is very popular in the countryside of almost all Southeast countries, particularly in Vietnam. Its ability can replace some kinds of wood in decoration and household goods. Bamboo grows up rapidly and can be harvested within 3 to 5 years of planting, in the meanwhile, the harvesting time of other hardwood trees must be from 8 to 10 years or longer. The inherent characteristics of bamboo are lighter than other wood materials and have a value in social and environmental benefits. Its advances in manufacturing technology have created high-value products such as bamboo flooring and bamboo furniture that can substitute for wood flooring and wood furniture. According to the biology studies, the bamboo has the characteristics that can replace the natural wood, but the direction of development from the stage of cultivation to the stage of finished products has not been exploited thoroughly. The production of bamboo plywood will become a great potential for the bamboo plywood industry in Vietnam. Generally, the fabrication of bamboo plywood depends on the following processes such as cutting, grinding to powder or pulp, drying, and pressing processes. In cutting and grinding processes, the trivial remains of bamboo after use, shoots… can be chopped and ground to a powder that is dried and pressed into bamboo plywood by a specialized machine similar to the production of artificial wood particleboard (PB). Bamboo powder drying machine plays a very important role in the production process of bamboo plywood. The function of the machine is drying bamboo powder to get the technical required appropriate moisture before pressing it into the standard bamboo boards. This article presents a design of bamboo powder drying machine with simple structure, long life, medium productivity, and price suitable for medium and small scale production of the Vietnam market. The first bamboo powder drying machine that was manufactured in DCSElab and its products is considered to respond to the technical requirements of customers.
Economic effects of monetary policy in Russia: What do large datasets tell us?
Authors: Pestova Anna A. , Rostova Natalia A.
Published: April 2020

Is the Bank of Russia able to control inflation and, at the same time, manage aggregate demand using its interest rate instruments? In other words, are empirical estimates of the effects of monetary policy in Russia consistent with the theoretical concepts and experience of advanced economies? This paper is aimed at addressing these issues. Unlike previous research, we employ “big data” — a large dataset of macroeconomic and financial data — to estimate the effects of monetary policy in Russia. We focus exclusively on the period after the 2008—2009 global financial crisis when the Bank of Russia announced the abandoning of its fixed ruble exchange rate regime and started to gradually transit to an interest rate management. Our estimation results do not confirm standard responses of key economic activity and price variables to tightening of monetary policy. Specifically, our estimates do not reveal a statistically significant restraining effect of the Bank of Russia’s policy of high interest rates on inflation in recent years. At the same time, we find a significant deteriorating effect of the monetary tightening on economic activity indicators: according to our conservative estimates, each of the key rate increases occurred in March and December 2014 had led to a decrease in the industrial production index by about 0.2 percentage points within a year.
Perencanaan Sistem Instalasi Plambing Air Bersih dengan Penerapan Alat Plambing Hemat Air Di Rumah Sakit Universitas Sam Ratulangi
Authors: Rahayu Adeyra Khairunisa , Pratama Yulianti , Nurprabowo Anindito
Published: April 2020

The hospital is a health service building, a place of transmission of disease and allows environmental pollution and health problems. One of the prevention of disease transmission and environmental pollution, it is necessary to do repairs and improvements by using a plumbing system to have good sanitation and environmental friendly. In this case, needed to know how much water can save by method comparing between plumbing tools conventional and non-conventional standar. UNSRAT’s hospital has a population of 2,962 people who needed clean water distribution of 372,48 m3/ day. Compared by using conventional plumbing tools is 66,72 m3/hari, meanwhile non-conventional plumbing tools is 39,60 m3/hari, it shown that using non-conventional plumbing  tools standard is more saving than conventional standard, where percentage non-conventional water saving is 40,64%. Also expected that the resulting domestic wastewater will be reduced by 31,68 m3/ day. This is more important than water savings in the amount of Rp. 3.564.000 and domestic wastewater treatment costs Rp. 9.500.000.
Isolasi dan Karakteristik Bakteri Pendegradasi Selulosa dari Limbah Pusat Industri Mebel Antang Makassar
Authors: Fahruddin Fahruddin
Published: April 2020

Antang Furniture Center in Makassar is one of the wood industries and is still traditionally. The wood processing produces waste containing cellulose that is difficult to degrade. This study aims to isolate and observe the characteristics of cellulose degrading bacteria. This research was conducted at the Microbiology Laboratory, Faculty of Mathematics and Natural Sciences, Hasanuddin University, Makassar from March 2019 to November 2019. The method used was an experimental laboratory consisting of Carboxyl Methyl Cellulose (CMC) media for bacterial selection and characterization including microscopic morphology with Gram staining and morphology macroscopic with colony structure. The results showed that cellulose degrading bacteria were characterized by the formation of clear zones formed on CMC media in petri dishes. Based on macroscopic and microscopic morphological characteristics, eleven types of cellulose degrading bacteria isolates were obtained. The isolates obtained can be a source of bacterial isolates for further application in wood waste or other wastes that contain of cellulose.
Pengaruh Buah Kundur (Benincasa hispida) dan Buah Nanas (Ananas comosus L. Merr) Rasio Serta Konsentrasi Gula Terhadap Mutu Fruit Leather
Authors: Yulia Ruka , Handayani Noni , Juliani Juliani
Published: April 2020

Fruit leather is a flesh of fruit that has been crushed and dried at 50-60oC. The study aimed to determine the effect of ratio of gourd and pineapple and the addition of sugar in the production of fruit leather. The variables were analyzed for chemistry analysis and organoleptic response. Chemical analyzes performed were water content analysis and fiber content. Organoleptic responses include color, aroma, texture, and flavor. The data was analyzed by Randomized Completely Design with two factorial. The ratio of kundur and pineapple (K) those are 80:20%, 70:30%, 60:40% while (G) those are 20%, 30% and 40%. The result of this study showed that the ratio of the concentration of kundur and pineapple 80:20% while the concentration of sugar 30% (K1G2) produced fruit leather of the highest quality with a moisture content of 8.15%, fiber content of 1.882, and organoleptic response of texture 3.80 (like) , color 3,71 (like), aroma 3,58 (like), flavor 3,91 (like).
Analisis Penentuan Lokasi Program Keluarga Harapan Dalam Menanggulangi Masalah Kekumuhan di Kota Tebing Tinggi, Sumatera Utara
Authors: Putri Chairida Yunita , Sirojuzilam Sirojuzilam , Rujiman Rujiman
Published: April 2020

Slum is a general impression or picture of attitudes and low behavior seen from the standard of living and middle class income. Communities that live in slums economically are generally classified as poor and low-income groups, which are often the reason for the degradation of discipline and disorder in various social order. This study aims to investigate and determine the right location for Family Hope Program (PKH) implementation so program implementation can be more targeted and targeted and able to reduce and overcome the problem of slums in Tebing Tinggi City, North Sumatra province. The method used is to use spatial analysis with a Geographic Information System (GIS) and 5 indicators data from TNP2K. These indicators are combined and modeled spatially using 3 class locations namely Inaccurate, Less Accurate and Precisely Accurate. The results of spatial analysis and modeling are the location of Inaccurate (Tebing Tinggi Kota sub-district), Less Accurate (Padang Hilir and Padang Hulu sub-district) and Precisely Accurate (Bajenis and Rambutan sub-district). The resulting spatial model was validated with satellite photos from Google Earth and photos of field visits using triangulation validation techniques
Pengaruh Konsentrasi Ekstrak Nanas (Ananas Comosus) Dan Waktu Fermentasi Pada Pembuatan Nata De Coco Dari Limbah Air Kelapa
Authors: Suzanni Mulia Aria , Munandar Aris , Saudah Saudah
Published: April 2020

Coconut water waste discharged into the environment is one of the problems in traditional markets. Coconut water waste treatment can be done simply by making nata de coco using the starter of bacteria Acetobacter xylinum obtained from pineapple extracts. The research is aimed to study the effect of the concentration of pineapple extract (Ananas comosus) and fermentation time in making nata de coco from coconut water waste by experimental methods. The results of nata de coco can be seen from the maximum thickness level obtained by 1.4 cm at a starter concentration of 150 ml, 200 ml, and 250 ml with a fermentation time of 21 days. The best quality of nata de coco is at 200 ml and 250 ml starter concentrations witch a content water of 13.79% and mineral content of 0.175%. The high percentage of nata de coco favorite level is the 250 ml starter concentration, based on the level of preference for color, shape, aroma, taste, and suppleness.
Studi Kuantitas Air Buangan Kampus Universitas Andalas Limau Manis Padang
Authors: Komala Puti Sri , Ruslinda Yenni , Zurienra Juwita
Published: April 2020

In this study, the quantity of wastewater from the existing facilities at the Andalas University Campus was carried out. The measured wastewater consists of grey water, black water, and specific wastewater. The wastewater was classified based on its activities, namely dormitories, lecture room, student facilities, offices, religious facilities, cafeterias, sports facilities, laboratories, and campus bus pools. The sampling method used was the bucket method. Grey water sampling was carried out on regular days (Monday-Thursday), worship days (Friday), and holidays (Saturday and Sunday), while specific wastewater and black water were measured on regular days. Peak hours occur at 12.00-14.00 except in the dormitory at 06.00-08.00 and cafeteria at 10.00-11.00. The peak factor of used water ranges from 1.56 to 3.13. From the measurement results obtained the wastewater from dormitory wastewater of 212.8 m3/day; lecture building 491 m3/day; student facilities 32.4 m3/day; offices 245.4 m3/day; worship 50.4 m3/day; cafeteria 109.2 m3/day; sports facilities 8.7 m3/day; laboratory 282 m3/day; corral 27 m3/day; and pool bus 34.7 m3/day respectively. The total wastewater from Unand Limau Manis Campus is 1,439.6 m3/day. The wastewater composition consists of, grey water 812.3 m3/day (52.67%), specific wastewater 343.8 m3/day (23.45%) and 337.5 m3/day (23.88%) black water.
Analisis Risiko Potensi Bahaya dan Pengendaliannya Dengan Metode HIRADC pada PT. IGASAR Kota Padang Sumatera Barat
Authors: Ihsan Taufiq , Safitri Aulia , Dharossa Dhywa Putra
Published: April 2020

PT IGASAR was one of the companies affiliated with PT Semen Padang with business activities in the fields of engineering, cement distribution, transportation, heavy equipment rental, cement-based building materials industry, manufacturing, general contractor, and developer. Some work accidents were still found in activities at this company. It was essential to making hazard identification, risk assessment, and determined the type of control in some areas. There are work accidents in PT IGASAR in as many as five cases in 2017 - 2018. One way was to use the Hazard Identification Risk Assessment Determine Control (HIRADC) Method. A risk analysis was done by looking at the opportunities and the severity of the hazards. Based on the results of the risk analysis, it was found that activities that were low risk, very high risk was absent while the medium risk was 100%. The risk control measures include the provision of personal protective equipment, the rule of safety signs, equipment maintenance, and the creation of road area boundaries.