bluuebunny/crossref_metadata_2025 huggingface dataset:
Operating a graphite calorimeter in quasi-isothermal mode under high-energy x-ray beams
Authors: Kim In Jung , Kim Yun Ho , Park Jong In , Kim Byoung-Chul , Yi Chul-Young
Published: October 2020

In this study, we developed a semi-active method to run a graphite calorimeter in the quasi-isothermal mode under high-energy x-ray beams. The rate of energy imparted by the beam during irradiation was compensated mainly by removing the electrical heating power based on the pre-calculation and in part by an active automated algorithm, as well, while the temperature of the calorimeter core was kept constant. Irradiations were performed under the linear electron accelerator x-ray beams at 6, 8, 10, 15, and 18 MV. A simple model was applied to analyze the results. The energy imparted to the core was determined with an uncertainty level of 0.2%–0.3%, and the results were reaffirmed by comparing it with that obtained by the quasi-adiabatic mode. The normalized root-mean-square deviation to the mean from the quasi-adiabatic mode was 0.11%, and the associated uncertainty was 0.16% taking into account the correlation of the uncertainty components. This level of agreement showed that the present method is practical for the high-energy x-ray dosimetry.
Hawking-Page phase transitions of charged AdS black holes surrounded by quintessence *
Authors: Yan Da-Wei , Huang Ze-Rong , Li Nan
Published: October 2020

Hawking-Page phase transitions between the thermal anti-de Sitter vacuum and charged black holes surrounded by quintessence are studied in the extended phase space. The quintessence field, with the state parameter

, modifies the temperature and the Gibbs free energy of a black hole. The phase transition temperature

and the Gibbs free energy

are first analytically investigated for the special case of

, and then, the results of numerical simulations are shown for general

. The phase transition temperature

increases with pressure and decreases with electric potential. In addition,

significantly decreases owing to the quintessence field, which generates negative pressure around the black hole.
Research on Teaching Reform of PUTONGHUA SHUIPING CESHI in Colleges Based on Computer Assist
Authors: Congying Sha
Published: October 2020

Computer testing is the mainstay of the current Putonghua proficiency test in colleges and universities. Using computer technology can not only improve the fairness of the Putonghua proficiency test, but also actively promote the reform of Putonghua teaching in colleges and universities. In the current teaching process of Putonghua in colleges and universities, we need to study and analyze the existing problems, at the same time study the impact of the computer-aided evaluation model on Putonghua teaching, and put forward strategies for the reform of Putonghua teaching in colleges and universities under the computer test mode. This can not only improve the efficiency of Mandarin teaching in colleges and universities, but also ensure the quality of teaching, and ultimately improve the Mandarin level of college students.
Application of Computer Aided Design Teaching in Ceramic Product Design Education
Authors: Xie Xuan
Published: October 2020

This paper first analyzes the definition and characteristics of computer aided design teaching, then deeply analyzes the application of computer aided design teaching in ceramic product design education, including the application of modeling method, the emphasis of computer aided instruction and the switching between three-dimensional space and real space, and finally expounds how to improve students’ computer aided design ability in ceramic product design education. Based on the development status of ceramic product design in China, this paper constantly improves the application of computer aided design teaching in ceramic product design education.
Food Safety Traceability Method Based on Blockchain Technology
Authors: Wang Yajie , Chen Kai , Hao Miao , Yang Bing
Published: October 2020

Food safety is a major issue related to the vital interests of the people. In recent years, food safety incidents have emerged in an endless stream in China. However, the existing food safety traceability methods lack of data sharing, which makes it difficult to conduct unified supervision on food safety. In view of the problems existing in the current food safety traceability method, this paper introduces blockchain technology in food safety traceability field, selects milk as the object of food safety traceability in this paper, analyzes the whole process of milk supply chain, designs the overall framework of milk traceability scheme according to the demand analysis and design principles of milk safety traceability scheme, and designs the scheme’s business function module, and chooses ECP-96 traceability coding scheme to ensure the uniqueness as well as security of milk traceability source. In view of the current application of blockchain technology, Hyperledger Fabric is creatively selected as the blockchain technology platform, and Go language is used to develop and implement the traceability method. Through the deployment of multiple nodes and functional testing, the expected food safety traceability goal is achieved.
Multi-particle crushing behaviors and characteristics via numerical simulations
Authors: Liu Chang , Chen Zuobing , Zhang Weili , Mao Ya , Ye Weidong , Yang Chenggang , Xie Qiang
Published: October 2020

Crushing equipment is involved in cement, electric power, nonmetal and other industries. However, the multi-particle crushing behaviors and characteristics are essential to the crushing equipment performance. In this paper a numerical model for multi-particle crushing has been established in order to investigate the behaviors and characteristics of particle crushing. The evolution process of particle crushing, size effect, law of energy accumulation and dissipation were comprehensively discussed. The particle crushing behaviors are remarkable. when multiple particles were crushed, a large number of failure units and acoustic emission (AE) appeared at the top. The energy consumed by multi-particle crushing was low, and multi-particle crushing was more efficient. The particle size is of great importance to the crushing characteristics. The bigger a particle is, the easier the crushing happens. This study could give useful suggestions in the design of the crushing technology.
Analysis of Recommendation Systems Based on Neural Networks
Authors: Song Ningxin
Published: October 2020

As the amount of online information explodes, the recommendation system has evolved into an effective strategy to overcome the problem of information overload, which has become the focus of academic and industrial circles, and has led to other related research results. Through the recommendation methods, the author mines the items including information, service, and goods that the user is interested in, and recommends the results to the user in the form of a personalized list. In this paper, the author mainly examines and summarizes the progress of research on neural network based recommendation systems in recent years, as well as giving conclusions about the differences and benefits between that and traditional algorithms. In the end, the future trend of the recommendation systems based on neural networks is prospected.
The Intelligent Nursing House for the Elderly Based on the IoT System
Authors: Song Yaqi , Luo Yitong , Zhou Yuyang
Published: October 2020

As the problem of the aging population is gradually intensifying, the current nursing house for the elderly cannot meet their living needs. Based on this, this article builds an intelligent nursing house system based on IOT. This article first puts forward the problems existing in today’s elderly care system, and gives detailed solutions from three aspects: health, diet and maintenance. We combine the Indoor health care and auxiliary module and Dining module into the main system network, and list home appliance maintenance solutions, which organically integrate nursing house and the IOT and cater to the intelligent background of the IOT. Finally, we can achieve the goal of intelligent nursing house.
Research on the Financial Difficulty Level Recognition of Needy Students Based Upon the Decision Tree C5.0
Authors: Luo Xichun , Kong Linghui , Wang Jiongxian
Published: October 2020

Accurate recognition on the needy students is a core part of the college student subsidy and management work. Supported by the predictive capability of data mining model, this thesis studied the data sample of the recognition on needy students in a college. It selected 33 explanatory variables and one target variable through data pretreatment. Then by means of decision tree C5.0, the data sample was used to build the model. By calculation, the predictive accuracy of decision tree C5.0 was close to 90% on identifying the financial difficulty level of needy students. Therefore, it possessed excellent predictive effect. In addition, Kappa coefficient evaluation method was used to further prove that the model possessed favorable predictive effects. This study aimed to provide decision basis for subsidizing the needy students in colleges and universities, consequently improving the “targeted subsidy” work.
Research on Obstacle Avoidance of UAV for Optical Cable Route Inspection
Authors: Xue Yinghui , Huang He , Ren Shuai , He Zhuzhen , Ran Jinzhi
Published: October 2020

Firstly, UAV is proposed to be used in optical cable route inspection, which is the main promotion direction of optical cable route inspection in the future. Then, an improved ant colony algorithm is proposed to solve the path planning problem of UAV, and the feasibility is verified by simulation.
Personalized knowledge point recommendation system based on course knowledge graph
Authors: Lang Yakun , Wang Guozhong
Published: October 2020

Existing class education lacks analysis of students’ learning data, which can not reasonably evaluate students’ mastery of knowledge points and locate students’ learning path in real time, nor effectively recommend the required knowledge points for students. In order to solve the above problems, a personalized knowledge point recommendation system model (KG-PKP) combined with the knowledge graph of the course is proposed. By using accuracy, answer-time and answer-types in answer records, evaluation equations which to judge students’ mastery of knowledge points can be constructed. We can extract the knowledge points in answer records and map them into the course knowledge graph. Personalized knowledge points for students can be recommended by using the semantic hierarchical relationship and sequence of knowledge points in the knowledge graph. The comparative experiment proves the validity and interpretability of the model.
Virtual simulation of Lathe Machining Training Based on Unity3D
Authors: Shen Bin , Chen Baoqi , Wang Yanwu
Published: October 2020

In this paper, through the use of SolidWorks three-dimensional software for the lathe three-dimensional modeling, the lathe three-dimensional model can more intuitively express the structure of the lathe. Through the analysis of the reducer shaft, this paper developed the machining process, and then the solid modeling of the shaft, and finally through the Unity3D software for the reducer shaft machining simulation analysis.
Discussion on Propositional Logic Incorporating Set Thought into Discrete Mathematics
Authors: Yu’e Liu
Published: October 2020

Discrete mathematics is a basic core course for computer and big data majors. It includes four parts: mathematical logic, set theory, algebraic structure, graph theory. They are relatively independent branches respectively, of which propositional logic is the first part of discrete mathematics teaching materials in mathematical logic. This chapter is difficult for students in the second half of this chapter because the basic concepts are not easy to understand thoroughly. In order to solve this problem, this paper integrates the set theory into the understanding and mastery of the connectives, truth tables and important equivalent formulas in propositional logic, thus breaking through the learning difficulties in this chapter of propositional logic, enabling students to find a sense of achievement in learning from the first chapter of discrete mathematics and stimulating students’ interest in learning this course.

Discrete mathematics is a mathematical discipline that studies the structure of discrete quantities and their interrelationships. It is an important branch of modern mathematics, as well as a basic core course for computer major and big data major. Its theory is strong [2]. Learning this course can cultivate students’ logical reasoning ability, abstract thinking ability and meticulous generalization ability, and lay a foundation for other professional courses. Discrete mathematics includes four learning parts: mathematical logic, set theory, algebraic structure and graph theory. Among them, mathematical logic mainly studies the reasoning and formalization methods of discrete objects. Propositional logic is the first chapter in mathematical logic, and is also the first part of most discrete mathematics textbooks. This chapter is characterized by many concepts, abstraction, rigorous logic and many proof, which makes it difficult for students to learn [3]. Based on many years of teaching experience, this paper summarizes the root of the students’ key difficulties in learning this chapter, integrates the collective thought to teach students to compare and understand, and then solves all the learning difficulties in this chapter.
Existence and Multiplicity of Positive Solutions for a Class of m-Point Fractional Differential Equations with p-Laplacian Operators
Authors: Xu Baiyan , Yang Yang
Published: October 2020

In this paper, by constructing the properties of Green function and fixed point theorem on cone, we study the existence of solutions for a class of m-point fractional differential equation boundary value problems with p-Laplacian operator, and prove the existence and multiplicity of positive solutions for boundary value problems by constructing superlinear functions.
Tower foundation selection and economic comparison of 110kV transmission line in plain area of South Hebei Power Grid
Authors: Yaning Ren , Fan Gao , Deguang Zhang , Xiangliang Shen , Siyuan Yin
Published: October 2020

Based on the statistics of the typical geological conditions and the foundation forces of common tower modules in the plain area of Southern Hebei Power Grid, this paper analyzes the basic forces of tower modules, the common forms of foundation are introduced, in terms of technology, economy, etc, in order to provide reference for engineering design.
The performance of typical QKD scheme under the condition of quantum measurement noise
Authors: Zhaolei Zhang , Zhiqiang Ma , Lei Shi
Published: October 2020

The performance of typical quantum key distribution protocol under the condition of quantum measurement noise has been explored in this paper. Additionally, the realization steps for quantum key distribution are presented. Based on the successful probability, the performance of quantum key distribution is studied. The results show that the total probability is not influenced by the phase factors, and this probability is relative with the amplitude parameters. The results about quantum key distribution protocol with measurement noise would be useful in the field of quantum communication.
A review of hardware timing channel detection and mitigation
Authors: Chen Gang , Zhu Zhenyan , Mao Baolei , Chen Wenxuan , Jian Jie , Zhang Zijiao , Zhuang Yan
Published: October 2020

Hardware timing channels are likely to leak information and easily ignored, which has gradually become the target of attacker. However, there are few investigations systematically analyse hardware timing channel detection and mitigation. In this article, we perform in-depth analysis for the detection technologies such as taint analysis, fuzzing, symbolic analysis and information statistics. And we further analyse some mitigation techniques such as taint analysis and algorithm analysis. Moreover, we compare and analyse the methodologies and characteristics of detecting and mitigating timing channel attack in recent years, and proposes a feasible perspective.
Design and implementation of an offline face recognition locker
Authors: Lin Wei , Hu Shaoyang
Published: October 2020

In order to promote the development of smart city and provide more intelligent and safe services for people’s life, an offline intelligent locker system based on face recognition is designed. This paper describes the overall structure of the system, functional design of each module, control logic and hardware design. The system is divided into user end and administrator end. The main functions used are cabinet opening, face detection, eigenvalue extraction, living detection, face comparison, communication protocol and information table maintenance. The system uses the M1n module of Sipeed company as the core of the face eigenvalue extraction module, the application layer module with Raspberry Pi as the core, and the control module with STM32 Series MCU as the core, which makes it possible to realize the low-cost face recognition system offline. After actual operation and debugging, the system scheme has good reliability and stability.
Research on Reducing the Periodic Fluctuation of GEO Satellite One-way Timing Deviation
Authors: Li Zhaonan , Gong Daliang , Shi Fengfeng , Wang Jiangting
Published: October 2020

The satellite timing service has been used widely for its high precision and low cost. Based on the periodic fluctuation of the GEO satellite one-way timing deviation, this paper explores the relationship between the phenomenon and satellite movement, and then found a very strong linear correlativity between timing deviation and signal transmission delay difference. Therefore, this paper proposes a linear delay contribution compensation model in order to reduce the cyclical influence of timing deviation. The experimental result proves that the model can modify the original timing result at most 70% and almost eliminate the periodic fluctuations.
Analysis and Applications of Carbon Dioxide Laser
Authors: Wang Caokun
Published: October 2020

As the lasers appeared in the last century, scientist made a lot of efforts to discover the properties of them. After decades of research, lasers have become an important part in our daily life today. Lasers with different functions have been used in various fields. The purpose of writing this paper is to make readers understand the laser better. In this paper, there is an explanation of laser at the micro level. Besides, this paper also introduces the construction of RF Wave guide carbon dioxide laser, and analyzes the natures of carbon dioxide laser as well as its different applications. In the end, some recommendations and prospects of the development of the carbon dioxide laser are stated.
EnKF-levelset method for an acoustics inverse medium scattering problem
Authors: Li Zhaoxing , Huang Jiangfeng
Published: October 2020

This paper demonstrates a numerical method for reconstructing penetrable obstacles in a homogeneous background medium. The ensemble Kalman method is proposed as an inversion solver, and the level set technique is discussed as a flexible way to tracking the boundary. Through some numerical examples, we show that the proposed method is effective and flexible even without the priori number knowledge of the scatterers.
Research and Application of Dynamic Torque Calibration for Torque Test Bench of Electric Actuator in Nuclear Power Plant
Authors: Xia Ming , Wang Xiaolong , Yin Yelei
Published: October 2020

In view of the current status of electric actuator torque test benches commonly used in domestic nuclear power plants to test the output torque of electric actuators, according to the requirements of the value traceability chain, the actual working state of the test bench is the factor that determines the accuracy of electric actuator torque. In order to accurately judge the actual working condition error of the torque test bench of the electric actuator of the nuclear power plant, this paper introduces an overall dynamic calibration method and device design scheme of the torque test bench of the electric actuator of the nuclear power plant. The device reproduces the actual working conditions during the calibration process, obtains the overall indication error of the test bench, and can also evaluate and judge the mechanical cooperation and functional status of the test bench to ensure that the comprehensive performance of the test bench can meet the actual work needs.
Analysis of Influence of Structural Parameters of Regenerative Cooling Channel of Scramjet
Authors: Gao Feng , Zhang Qian , Xiao Hongyu , Chen Fengli , Xia Xuefeng
Published: October 2020

In this paper, a three-dimensional modeling analysis of regenerative cooling channels of scramjet engines is carried out, and the cooling channel structure parameters such as inner wall thickness, fin thickness, channel aspect ratio, cross-sectional area and number of channels are used to cool the regenerative cooling. The conclusion is as follows: the thinner inner wall thickness corresponds to a lower wall temperature, while the heat flux density is larger, and the kerosene temperature and pressure change little; the thin fins correspond to the higher wall temperature and oil temperature, but the kerosene is in the cooling channel. The pressure loss is smaller, and the thicker fins have a lower maximum wall temperature and maximum oil temperature, but a larger pressure loss; the greater the aspect ratio, the better the cooling effect of the channel, and the wall temperature and oil temperature are relatively low, but also It is not possible to choose a cooling channel with an aspect ratio that is too large. This is because after the aspect ratio is greater than 1, the pressure loss in the channel increases as the aspect ratio increases; reducing the channel cross-sectional area can increase the flow rate, thereby increasing convection The heat transfer coefficient makes the maximum wall temperature and oil temperature lower, but the kerosene with a too small channel area has a larger flow resistance in the channel, and the effective heat exchange area also becomes smaller; an increase in the number of channels can make the transfer Heat is strengthened, and cooling channels can be arranged more when the temperature of the material permits to give full play to the kerosene heat sink and fin effect to enhance the cooling effect.
Application of double-enlarged excavation foundation in transmission line engineering
Authors: Zhang De Guang , Shen Xiang Liang , Gao Fan , Ren Ya Ning , Wang Li Huan , Ma Cong
Published: October 2020

This paper introduces the application of double-enlarged excavation foundation in transmission line engineering. Based on the comparison of expanding excavation foundation and double-enlarged excavation foundation, this paper expounds the advantages of double cut and enlarge base, such as high bearing capacity, convenient construction, low cost, safety and environmental protection. It introduces the application of the double-enlarged excavation foundation in the transmission line project through an engineering example, and expounds that the type of foundation is suitable for the corner tower with large foundation force in the transmission line in the hilly area, which has good economic and social benefits.
A Conjugate Gradient Method for Inverse Problems of Non-linear Coupled Diffusion Equations
Authors: Shuai Wang , Baiyan Xu , Tao Liu
Published: October 2020

In many fields there are many problems called inverse problems, which infer the reasons from the observations. The inverse problem of nonlinear diffusion equations plays a crucial role in the numerical simulation of reservoirs. This article constructs a conjugate gradient method to solve the inverse problem of a nonlinear diffusion equation within oil reservoir simulation. The numerical simulation is performed, and the results show the effectiveness of the method.
Research on General Design and Application of Double-circuit T-Connection Tower In 110kV
Authors: Zhang De Guang , Wang Li Huan , Liu Jian , Ren Ya Ning , Gao Fan , Shen Xiang Liang
Published: October 2020

Based on the investigation results and the current general design of state grid, this paper reasonably planned the design conditions of the tower. Taking the general design module as the basic tower type, a kind of double loop T-connection tower in 110kV with high generality was proposed, then carry out tower head planning and structural internal force analysis. Finally, the electric field finite element simulation is carried out to demonstrate the safety and reliability of the T-connection tower of cross arm arrangement. The tower can cover the T-connection conditions of 110kV double-circuit line in most areas of the country, and draw the tower diagram, which can be included in the general design of state grid transmission tower for reference of line designers. The cross arm of tower head is arranged in a crisscross way, which greatly simplifies the the double-loop T-connection scheme. One tower can replace the traditional multi-tower to complete the T-connection of the line, which reduces the cos t and occupation of land, also achieves good economic and environmental benefits.
A Six Bit Silicon Nitride Optical True Time Delay Line for Ka-Band Phased Array Antenna
Authors: Yang Huimin , Yun Binfeng
Published: October 2020

A six-bit optical true time delay unit with a delay tuning increment of 1.42 ps was designed and fabricated on silicon nitride platform, which can be utilized in Ka-band phased array antenna systems. The delay unit consists of seven thermo-optical switches and six waveguide delay lines with different lengths. By changing the states of the thermo-optical switches, 64 stages of discrete time delays varying from 0 to 89.6 ps has been obtained. In addition, as the waveguide delay independence on the modulation frequency, so the designed silicon nitride delay unit can be applied in microwave applications with broader bandwidth.
Identifying key ecosystem service providing areas to inform national-scale conservation planning
Authors: Mitchell Matthew G E , Schuster Richard , Jacob Aerin L , Hanna Dalal E L , Dallaire Camille Ouellet , Raudsepp-Hearne Ciara , Bennett Elena M , Lehner Bernhard , Chan Kai M A
Published: October 2020

Effectively conserving ecosystem services in order to maintain human wellbeing is a global need that requires an understanding of where ecosystem services are produced by ecosystems and where people benefit from these services. However, approaches to effectively identify key locations that have the capacity to supply ecosystem services and actually contribute to meeting human demand for those services are lacking at broad spatial scales. We developed new methods that integrate measures of the capacity of ecosystems to provide services with indicators of human demand and ability to access these services. We then identified important areas for three ecosystem services currently central to protected area management in Canada—carbon storage, freshwater, and nature-based recreation—and evaluated how these hotspots align with Canada’s current protected areas and resource development tenures. We find that locations of ecosystem service capacity overlap only weakly (27–36%) with actual service providing areas (incorporating human access and demand). Overlapping hotspots of provision for multiple ecosystem services are also extremely limited across Canada; only 1.2% (∼56 000 km2) of the total ecosystem service hotspot area in Canada consists of overlap between all three ecosystem services. Canada’s current protected area network also targets service capacity to a greater degree than provision. Finally, one-half to two-thirds of current ecosystem service hotspots (54–66%) overlap with current and planned resource extraction activities. Our analysis demonstrates how to identify areas where conservation and ecosystem service management actions should be focused to more effectively target ecosystem services to ensure that critical areas for ecosystem services that directly benefit people are conserved. Further development of these methods at national scales to assess ecosystem service capacity and demand and integrate this with conventional biodiversity and conservation planning information will help ensure that both biodiversity and ecosystem services are effectively safeguarded.
Universal survival probability for a correlated random walk and applications to records
Authors: Lacroix-A-Chez-Toine Bertrand , Mori Francesco
Published: October 2020

We consider a model of space-continuous one-dimensional random walk with simple correlation between the steps: the probability that two consecutive steps have same sign is q with 0 ⩽ q ⩽ 1. The parameter q allows thus to control the persistence of the random walk. We compute analytically the survival probability of a walk of n steps, showing that it is independent of the jump distribution for any finite n. This universality is a consequence of the Sparre Andersen theorem for random walks with uncorrelated and symmetric steps. We then apply this result to derive the distribution of the step at which the random walk reaches its maximum and the record statistics of the walk, which show the same universality. In particular, we show that the distribution of the number of records for a walk of n ≫ 1 steps is the same as for a random walk with n
eff(q) = n/(2(1 − q)) uncorrelated and symmetrically distributed steps. We also show that in the regime where n → ∞ and q → 1 with y = n(1 − q), this model converges to the run-and-tumble particle, a persistent random walk often used to model the motion of bacteria. Our theoretical results are confirmed by numerical simulations.
Flowering characterization and its relation to the type of pollination on gambier (Uncaria gambir (Hunter) Roxb.)
Authors: Hayati PKD , Fitri AW , Fauza H
Published: October 2020

This article reports on some of the flowering characteristics that are related to the type of pollination that occurs in the gambier plant. The observation has been carried out in the Gambier Research Station of Faculty of Agriculture, Andalas University, Padang. The research used descriptive method which observes flowering characteristics in ten plants using ten selected flowers within plants. Results from the observation showed that the bud inititation, small-bud, large-bud, anthesis, and fruit development phases occur in 19, 33, 6, 4, and 58 days. All phases complete in 120 days, ranging from 106-134 days. Anthesis occur at 18:30 – 05:00. The receptivity of the stigma and maturity of pollen occur before anthesis, while the highest receptivity occur at 00:00. Cleistogamy mechanism happens in the gambier plant. Self-pollination (both autogamy and geitonogamy) and cross-pollination (xenogamy) exist in gambier.
Application of geo-organo granule fertilizer derived from volcanic ash and tithonia on corn production at oxisols
Authors: Gusnidar G , Fiantis D , Nelson M , Yulnafatmawita Y , Satrio B , Jasmine Y
Published: October 2020

Volcanic ash material (Vam) can cover the surface of the farming land post volcano eruption. The covering process could be advantageous for soil fertility if it is thin enough, but it can be destructive for the crops if it is thick. The purpose of this research was to study the effect of the application of Geo-organo granules from volcanic ash and Tithonia (Tt) for the production of Baby Corn in Oxisol. The pot experiments design with six treatments (1AV:1Tt; 1AV:2Tt; 1AV:3Tt; 1AV:4Tt; 1AV:0Tt; 0AV:1Tt)) three replications, and used Completely Randomized Design (CRD). The criteria test of compost standard used to test the benefit of these Geo-organo materials (PT Pusri, SNI, and Regulation from Agriculture Ministry, Republic of Indonesia). Corn growth was also measured for height and yield. Plant height and yield were analyzed using F-test and continued using HSD at a 5% level of significance. The results showed that Geo-organo granules be to improve soil chemical properties of Oxisol, and mass of cob of Baby corn.
Effectiveness of rice husk biochar in controlling heavy metals at polluted paddy soil
Authors: Yulnafatmawita Y , Yasin S , Maira L
Published: October 2020

Polluted irrigation can degrade soil chemical properties and then decrease land productivity. This research aimed to compare the effectiveness of biochar against manure in reducing the concentration of some heavy metals(HM) in the polluted rice field. This pot trial was conducted at Glasshouse using two types of amelioration (biochar and manure). Biochar and manure were incubated with paddy soil under field capacity at the glasshouse for one month. The results showed that increasing the dosage of either biochar or manure applied decreased the availability of HM, especially Fe (r=-0.87, r=-0.89) and Mn (r=-0.82, r=-0.91), respectively. However, there was no effect of biochar (r=0.25) but increased by manure (r=0.95) application on Zn concentration. Furthermore, some other heavy metals concentration also decreased, such as Ag (r=-0.89), Pb (r=-0.54), Cu (r=-0.51), Cr (=- 0.50), and Ni (r=-0.64) by applying biochar but tended to increase by applying manure. Both biochar and manure could increase some plant nutrients, especially K (r=0.74, r=0.82), P (r=0.85, r=-0.44), Mg (r=0.98, r=0.91) and Ca (r=0.98, r=0.84), respectively.
Tropical fruit research and development programs of Indonesian Tropical Fruits Research Institute (ITFRI)
Authors: Mansyah E , Sutanto A
Published: October 2020

Indonesian Tropical Fruit Research Institute (ITFRI) is one of the research institutes under the Indonesian Agency for Agricultural Research and Development (IAARD), Ministry of Agriculture. The responsibility of ITFRI is to produce technologies for increasing competitiveness of tropical fruit agribusiness in the global market. The priority commodities handled are divided into main and potential commodities. The main commodities are banana, mango, mangosteen, and durian, while the potential commodities are papaya, snake fruit, watermelon, Cucumis melo, pineapple, and breadfruit. Research activities of ITFRI could be divided into three groups namely fruits breeding and genetic resources, ecophysiology, and plant protection. This paper will explain the role of ITFRI to support food security through fruit research and development activities.
Financial feasibility of lime (citrus aurantifolia) farming in Tanah Datar District, West Sumatra
Authors: Sari R , Nofialdi  , Putri A
Published: October 2020

Lime (Citrus aurantifolia) farming is one of the subsystems that form the lime agribusiness system in Tanah Datar District. This business has the potency to be developed. This study aimed to determine the feasibility of lime farming in Tanah Datar District in terms of financial aspects. This study used a survey method with a sample of 30 farmers in Padang Ganting Sub District, Tanjung Emas Sub District, and Lintau Buo Sub District, West Sumatra - Indonesia. Data were analyzed using investment criteria B / C, NPV, IRR, and sensitivity analysis. The analysis shows that the interest rate is 13% and the selling price is IDR 4.300 / Kg during the productive age (15 years), the value of B / C is 1.92, NPV is IDR 51,809,117 and IRR is 37%. Sensitivity analysis shows that the selling price is IDR 500 Kg, then the business is not feasible. While the selling price of IDR 846 / kg, Break Event Point (BEP) is reached. It can be concluded that lime farming is feasible. However, policies in trade and product use are needed so that the selling price does not fluctuate, and farmers do not experience losses.
Comparatif analysis on working time allocation of the system of rice intensification (SRI) and non-SRI rice farming in West Sumatra
Authors: Usman Y , Yusmarni Y , Refdinal M
Published: October 2020

The System of Rice Intensification (SRI) is an effective and efficient rice farming technique to increase the rice yield. However, the preliminary finding indicates that most farmers are reluctant to apply the SRI farming system because it takes a lot of time and is more complicated than conventional rice farming systems. The aims of this research are to examine the working time allocation on both SRI and Non-SRI farming systems and investigate the difference between both farming systems. This research was conducted in two regions of West Sumatera to represent upland and lowland areas during the period of Mei – June 2018. The region that represents the upland area is Simarosok Village in the district of Agam, and the lowland area is Kasang Village in the district of Padang Pariaman. The research found that the average working time allocation on the SRI farming system was 145.41 man day/Ha, while on the non-SRI farming system was 91.40 man day/Ha. Thus there was a significant difference between time allocation on SRI and Non-SRI farming systems in West Sumatera. Working time allocation on the SRI farming system was higher than the non-SRI farming system in the following activities: planting, weeding, making of organic fertilizer, and time to control the irrigation. Based on findings, it is suggested to the government and other related parties to provide appropriate weeding technology as well as organic fertilizer. Moreover, the farmers should be able to split time wisely between SRI farming and other business.
Smallholders’ diversification in Pauh Sub District Padang City West Sumatera Indonesia
Authors: Utami AS , Azhari R , Syarfi I W
Published: October 2020

Plantation farming is an economic activities with high risks and uncertainties (income fluctuations between production cycles or even between years is quite high) therefore the motives of farmers for diversification are often more oriented towards stabilizing income than maximizing income. Production diversification is one of the effective adaptation methods to reduce the risk of production due to climate change and is conducive to supporting the development of local resource-based processing industries. Therefore, this study aims to analyze the model of plantation diversification in Pauh Sub Distric, Padang city. The method of the study is qualitative method. The respondents are the plantation smallholder who are diversifying their farm in Pauh sub-Distric. The study found that, there are four models of diversification in Pauh District; Plantation crop with horticultural crops diversification, Plantation crop with food crop diversification, Plantation crop with livestock diversification, and Combination. The level of diversity in Pauh is between 0.2 to 0.4. The lowest level of diversity is 0,237, while the highest level is 0,434.
Drying air temperature profile of independent hybrid solar dryer for agricultural products in respect to different energy supplies (a research note)
Authors: Yuwana Y , Silvia E , Sidebang B
Published: October 2020

Drying is an important process of food preservation for security and sovereignty. The lack of conventional source of energy and limited supply of electricity urge to develop dryers for agricultural products adaptive to renewable energy sources and electricity independent. The invented dryers should then be able to generate various drying temperatures to accommodate variety of agricultural products to be dried. This study aims to explore the drying air temperature generated by so-called the independent hybrid solar dryer in respect to different energy supplies. The dryer consists of a drying chamber of 4.6 m3 capacitieswith five stories of ten trays inside, a chimney equipped with turbine ventilator, a heat exchanger embedded to furnace, and double heat collectors. Whole structure of the dryer is covered by transparent glasses and occupies 13m2 horizontal area. The dryer operates in three modes i.e. solar energy, energy produced by fuel combustion, and simultaneously solar energy and fuel combusted energy. The dryer can operate any time and in any weather condition. So it is suitable to be installed in remote area to produce hygienic dried products. In this experiment, the dryer was tested without load (product to be dried), when operated with solar energy and energies produced from biomass and coal combustions. The experimental result revealed as follows. When operated with solar energy with average radiation intensity of 956.4 W/m2, the dryer generated drying air temperature of 47.1°C which was 12.8°C higher than that of ambient air. Operated with the heat energies from both the coffee by product and coal combustions, the relationship between temperatures and fuel supplies were T = 4.323 s + 22.57 (R2 = 994) and T = 5.003 s + 22.57 (R2 = 0.998) respectively, where T = drying air temperature (°C) and s = fuel supply (kg). This dryer would be able to be operated for wide varieties of agricultural products according to the required temperatures.
Aluminum Alloy Piston Fabrication Technology by Super Forging-KIRIU
Authors: Anggraini Lydia , Anjany Adelya
Published: October 2020

This research aims to produce pistons a lighter and stronger piston, even in high compression and high engine speed conditions. The piston fabrication process is carried out by super forging using Aluminum as a raw material with a compound choice by Silicon or Magnesium. In addition, the outer layer of the piston is covered by molybdenum with the coating process as nanotechnology to prevent corrosion. Furthermore, the finishing is controlled by the programming system machine named CNC (Computerized Numerical Control). In addition to CNC, the automation system is carried out by the KIRIU machine which is also used in this study. The results of this study show that the use of Al-Si alloy base material has better piston quality and able to withstand high compression or high engine speed. Then, the Al-Si superforging piston compared to the two final automation processes of CNC and KIRIU. The evaluation results have proved that the KIRIU machine provides high accuracy and the actual production increases by 20% compared to CNC.
Policy Implementation in Water Services
Authors: Nenobais Harry , Sarbini
Published: October 2020

This study analyzes the factors that influence the implementation of policies in clean water management based on participatory management of the Sukoharjo community. This research was conducted at the Tirta Makmur Regional Public Water Company in Sukoharjo Regency. The research method used is a qualitative method using the theory of implementation of the policies of Donald Van Meter and Carl Van Horn (1975). The research results conclude that the factors that influence the implementation of clean water service policy based on participatory management by the Tirta Makmur Regional Public Water Company in Sukoharjo Regency are clear policy and standard objectives, consensus on changes in policy implementation, human resource capacity of implementing organizations, financing, the quality of interorganizational relations, a healthy political, social and economic environment, and participatory management. The results of this study suggest that the Regional House of Representatives, Regency Government, and Management of Regional Public Companies have a large consensus of change, government and community participation, investment in service improvement, preparing raw water sources.
Characteristics of Magnesium/B4C Reinforced Composite Fabricated by Stir Casting Method
Authors: Paulo Hang Jutanaiman Sutan , Zulfia Syahrial Anne
Published: October 2020

At present the development of magnesium composites is increasingly being carried out, this is due to the main advantages of magnesium which has the lowest density when compared with other metals so that it can save fuel use when applied as a constituent of an automotive product yet still has great mechanical properties. In this research, magnesium composite is fabricated by mixing magnesium as composite matrix and micro B4C as reinforcement particle with 2, 4, 6, and 8 Vf-% by stir casting method. The magnesium reinforced B4C particles has improved the mechanical properties of the composite. The best mechanical properties of magnesium composite are shown by the addition of 8 Vf-% B4C particles. These values increase up to 73 HRH for the hardness and 64 MPa for the UTS as well as, 0.11 J / mm2 for the impact value. The wear rate also reduced to 0.0023 mm3/m. The mechanical properties of magnesium composite are increased due to the increasing number of B4C particles thatcaused new interfaces which will block dislocation movement and dispersed B4C particles will also act as load restraint elements. Composite characterization was also carried out by using SEM-EDS and XRD test to find out the compounds and phases formed from the fabricated composites -then it was known that the possible compounds formed from the composites produced were MgB2, MgO, B4C, and Mg2B2O5 respectively.
Iodogen Method on Iodine-131 (131I) Radiolabelling of Silver Nanoparticle (AgNPs) as a New Agent of Molecular Imaging
Authors: Aries A , Sarmini E , Nurmanjaya A , Subechi M , Sholikhah UN , Lestari E , Setiawan H , Febriana S , Sriyono S , Abidin A
Published: October 2020

The application of nanomaterials in the treatment of various types of diseases continues to increase, including the use of silver nanoparticles (AgNPs). However, there still limitation in terms of the research on labelling AgNPs using radioactive compound such as 131I. The aim of this study is to carry out a method on 131I radiolabelling of AgNPs by using Iodogen as an iodination reagent. The radiolabelled 131I-AgNPs were then purified by using Sephadex-25 column chromatography with 0,05 M phosphate buffer solution as mobile phase for the first purification and HEPES solution for the second purification. The radiochemical purity of radiolabelled 131I-AgNPs was then determined by using autoradiography scanner. 131I-AgNPs with a purity 94,5±0,2121% were obtained after the purification. Stability test of the 131I-AgNPs was carried out by determining the radiochemical purity of the 131I-AgNPs on the first day until the fifth day of storage in the room temperature and refrigerator. The best stability of the 131I-AgNPs after purification resulted in radiochemical purity >90% until the fourth day and <90% on the fifth and subsequent days in both storages. This result shows that storage in the refrigerator can be a better choice rather than in the room temperature.
Estimation of Muon Stopping Site in CoCr2O4 Using Density Functional Theory
Authors: Heda Murdaka Fiqhri , Nakamura Kohji , Agung Nugroho Agustinus
Published: October 2020

Spinel material Cobalt Chromite (CoCr2O4) is a ferrimagnetic material with TC of about 93 K. This compound has attracted much attention due to the presence of electrical polarization which related to spiral magnetic transition at TS = 26 K. [Physical Review B, 70, 214434, 2004]. This spiral magnetic transition phenomena could be explored by experiment using Muon Spin Rotation, Relaxation, and Resonance (liSR) . Positive muon in liSR plays a role as a local magnetic probethus, we need to determine the muon stopping site information. In this study, we investigate the muon stopping site of CoCr2O4 with ferrimagnetic ground state using spin polarized Density Functional Theory implemented in Full-potential Linearized Augmented Plane Wave (FLAPW) method. The exchange-correlation effect was considered in the scheme of GGA+Ueff approximation. Based on the minimum energy of electrostatic potential, we obtain the muon stopping site around the three Oxygen ions in the tetrahedral site of Cobalt.