bluuebunny/crossref_metadata_2025 huggingface dataset:
Numerical Simulation Study on Mechanical Properties of Coarse-Grain Mixed Soil High and Steep Slope at Different Water Contents
Authors: Wei Jianfei , Liao Guangchen , Guo Yonggang , Wang Peiqing
Published: March 2020

In order to study the stability mechanism of coarse-grained mixed soil with high steep slope in different areas of water content in southeast Tibet, this paper takes a high-steep slope of Sejila Mountain in Nyingchi City as the research object, and the undisturbed soil configuration for on-site retrieval includes natural water content. Three kinds of soil samples with a rate of 6%, a water content of 3% and a water content of 9% were obtained by using the ABAQUS numerical analysis using the mechanical parameters obtained by the large-scale triaxial test to obtain the development of the plastic zone of the model. The high-steep slope is used to form the penetrating plastic zone and the calculation non-convergence is used as the safety factor for determining the slope instability. The characteristic point displacement is abruptly changed to the safety factor of the slope instability criterion, and the characteristics of high-steep slope failure are observed. And the sliding surface map and displacement change after numerical calculation to lose stability, analyze the safety factor that forms the through-plastic region as a standard, and the safety factor that does not converge to the force and displacement calculation. The high-steep slope can be known by numerical analysis. The numerical calculation of the natural moisture content gives the highest safety factor, indicating that the high steep slope is the most stable under natural moisture content.
A PAPR Reduction Method Based on the CT Codes
Authors: Deng Zaihui , Ding Sha
Published: March 2020

This paper proposes a Peak-to-Average Power Ratio (PAPR) reduction method based on the Chinese Transform (CT) codes intended for the Orthogonal Frequency Division Multiplexing (OFDM) systems. Based on the advantage that remainder is smaller than the corresponding modulus during the CT encoding, the proposed method adopts the strategy of dynamical controlling the dynamic range of the OFDM transmission signal at the front stage. The simulation results show that the proposed method is effective in reducing the PAPR of OFDM system.
A Vehicle Location Algorithm Based on Community Discovery
Authors: Yang Yang , Lin Fei , Yu Dingguo , Yang Chen , Lin Qiang
Published: March 2020

The group behavior of the vehicle can accurately describe the movement law of the vehicle in the vehicle network. A vehicle node with strong GPS signal in the Internet of Vehicles can use its communication capability and its neighbor positional relationship to calculate the position of a vehicle with a weak GPS signal located within a certain distance range and having the same or similar driving destination. The algorithm divides the vehicles with the same or similar destination destinations into the same community based on the destination of the vehicle, and then calculates the position of the vehicle that needs to be located, and corrects the calculation result. The experimental results show that the proposed algorithm reduces the positioning error by 15%-35% compared with similar methods. Under different traffic conditions, the stability of the algorithm is improved by more than 25%.
Exploring the Relationships between Impervious Surface Percentage and Frequency of Urban Waterlogging: A Case Study in Hanoi, Vietnam
Authors: Tran Ducthien , Xu Dawei , Dang Vanha , Fadelelseed Safa
Published: March 2020

In developing countries, rapid urbanization reduces the natural land area and increases the impervious surface. At the same time, urban rainstorm waterlogging is also becoming more frequent and serious. Therefore, one of the important works to be done is to elucidate the relationship between impervious surface expansion and waterlogging frequency (WF) causes of urban waterlogging. To move forward, we used ENVI to classify land cover types and applied the spatial analysis methods integrated in ArcGIS with internet open data to explore these relationships in Hanoi, Vietnam in 2018. The results show that waterlogging frequency was positively related to impervious surface percentage (ISP), indicating that if the median values of ISP increased then the waterlogging frequency would increase as well with a confidence level of 63.2%. This study demonstrates the importance for controlling the impervious surface expansion in urban waterlogging risk management and urban planning.
Current Situation and Development of Labor Capacity in Mining Industry in China
Authors: Liu Cong , Zhang Songyuan , Long Xiaobo , Wen Yiming , Ma Lei , Zhuang Hong
Published: March 2020

Cutting excessive industrial capacity is the main concern of mining industry. Reasonable labor capacity management aimed at mining industry is to accelerate its transformation and upgrading and provide a strong guarantee. In China, the development of labor capacity management in mining industry has gone through six stages. At present, we are in the transformation and upgrading stage. Now many provinces has issued the maximum number of people working underground in the company. Macroscopic labor capacity management is convenient, however, it cannot be adapted to various situations. Many researchers have done some research from its method and mathematical model. Mining workers’ physiology and psychological health have also been analyzed. But labor capacity management focuses on industrial policy orientation. Labor capacity management in mining industry involves many fields. Besides that, because of mining features, different geological conditions of mining, and production conditions, the labor capacity management needs government coordination. The database should be set up nationwide and policy orientation should be formed after experts’ analysis. Coal enterprises can also train special staff in charge of labor capacity management.
Study on Stability Analysis and Control Technology of Floor Rock Roadway in Dynamic Pressure Stope
Authors: Xu Xingfu , Liu Cong , Zhang Songyuan
Published: March 2020

Taking the floor rock roadway of 10414 working face of Yangliu Coal Mine in Huaibei as the engineering technology background, this paper uses theoretical analysis and numerical simulation technology to analyze the stability of floor rock roadway caused by stope mining. According to the dynamic pressure of stope, the support stage is divided into three stages: timely support scheme after excavation, pre-mining reinforcement support stage and post-mining repair support stage, and corresponding suggestions are put forward. Support scheme, through field practice, the overall maintenance of roadway affected by dynamic pressure is in good condition, the deformation of roof, floor and both sides are within the controllable range, and the roadway section can meet the requirements of normal use.
Control Technology of Overlying Roadway in 7m Goaf
Authors: Liu Cong , Liu Zhennan , Li Ji , Wang Meng , Cheng Yong , Qiu Pengrui
Published: March 2020

This paper takes Zhuxianzhuang Mine as the research background. In this research, the reasonable height of “three zones” of overlying strata at 7m mining height is determined by key strata theory, and the movement law of overlying strata is studied by FLAC3D numerical simulation. The stress, displacement and plastic zone of surrounding rock under the three schemes of no support, bolt support and roof support are compared and analyzed according to the site construction situation. On this basis, the regional treatment scheme is put forward. The test results prove that the adoption of staged process control technology and enhanced support technology can effectively control the surrounding rock deformation of overlying strata roadway, which is scientific and reasonable in technology and effective and feasible in construction.
Field Experimental Study on Mechanical Characteristics of Primary Supporting in Weak Surrounding Rock Tunnel
Authors: Wang Zhiqiang
Published: March 2020

Since the poor self-stability of weak surrounding rock when applied the full-face excavation in a tunnel construction, a large surrounding rock deformation are tended to occur, which causes a big security risk. Under the engineering background of gaojiaping tunnel of zheng-wan high-speed railway, the stress of surrounding rock, steel frame, initial shotcrete stress, bolt axial force and extrusion deformation of working face of the tunnel are monitored and analyzed respectively. The results show that the surrounding rock stress, steel frame stress and initial shotcrete stress of the tunnel are significantly affected by surrounding rock lithology and construction disturbance. The plastic zone of surrounding rock can be preliminarily determined as 3m according to the peak value of bolt axial force. The extrusion deformation of the tunnel working face shows that the surrounding rock integrity of the test section is good. The experimental study is helpful to collect the deformation of weak rock mass and provide reference for establishing scientific and reasonable support system.
Prediction and Analysis of the Axial Force of Pump-Turbine during Load-Rejection Process
Authors: Li Xiangyang , Mao Zhongyu , Lin Wenhua , Bi Huili , Tao Ran , Wang Zhengwei
Published: March 2020

Load-rejection is an important process of pump-turbine unit. In this process, hydraulic characteristics would change greatly. The axial force of runner and of the entire shaft system will be impacted. This study focuses on a prototype pump-turbine unit. The axial force of this unit during load-rejection is predicted and analyzed. The hydraulic transient analysis can give a more accurate boundary condition of pumpturbine. The computational fluid dynamics simulation considering the full leakage in runner crown and shroud can have a comprehensive prediction of the axial force. Results show that the rotation speed, head and flow rate change during load-rejection process. The axial force is also influenced and changes. The law of axial force variation has a strong relationship with the flow rate variation law. The internal flow analysis found that the pressure difference between crown leakage and internal-runner near outlet is the key factor in inducing axial force. This pressure difference is strongly influenced by runner internal flow regime. During load-rejection process, flow rate strongly varies and causes the huge change of internal flow regime. This is the main reason that runner axial force changes positive and negative alternatively.
Design and Implementation of ERP System Based on SSM Framework
Authors: Zhang Lina , Wang Changchun , Cao Jixiang
Published: March 2020

With the continuous development of enterprise information technology, information resource sharing has become a major subject of scientific research projects. Traditional enterprises have complex business processes, low management efficiency and high operation cost, which leads to enterprises of low competitiveness. Therefore, it is the best choice for enterprises to regain their core competitiveness to use ERP management system to improve their operation process, simplify their operation and make their operation methods transparent. This paper designs an ERP system based on SSM framework. This paper introduces the basic principles of SSM framework, respectively realizes the business functions of Controller layer, Service layer and DAO layer in the framework, and designs Web pages for data collection and display. The main components of the system consist of six modules: purchase plan, purchase order, purchase contract, purchase document inquiry, purchase to order and purchase return, which can well realize the actual requirements of enterprises.
Effects of Psychological Stress during Pregnancy on FE3 in Maternal Serum
Authors: Wang Qiyang , Ma Huizi , Zhang Ruoqi , Zhai Fengxia , Li Xinmin , Hou Junlin , Yang Liping
Published: March 2020

Objective: to investigate the effect of psychological stress during pregnancy on serum FE3. Method: symptom self-rating scale (scl-90) was used to evaluate the degree of psychological stress of pregnant women.The Free estriol (FE3) level in maternal serum was detected by particle chemiluminescence. Result: serum FE3 levels in pregnant women in the stress group were significantly lower than those in the control group (P < 0.05). Conclusion: psychological stress during pregnancy can reduce serum FE3 level.
Research on the Development of Petroleum Engineering Technology Public Service Market Information System in the New Period
Authors: Li Jinze
Published: March 2020

The paper analyses the business process of the oilfield engineering technology public service market information management system through UML modelling. Then, according to the work requirements of the engineering and technical management department staff of the oilfield branch, the performance requirements and functional requirements analysis were carried out. In particular, a detailed analysis of the functional requirements of each sub-function is performed. The experiment verifies that the information system can collect, integrate and analyse the business data reported by each unit in real time and conveniently. It can quickly and accurately form decision-making opinions and management methods, which greatly avoids the process error in the establishment of production capacity. The establishment of the engineering technology public service market information system provides greater power and service.
Study on Influencing Factors of Urban Land Use System Performance in Heilongjiang Province
Authors: Cui Mingxin , Xiao Yanling , Luan Shaochen
Published: March 2020

The paper proposes the concept of land use system that is considered as a whole of interaction among the three main bodies of government, enterprises and residents, land and nature. With the help of structural equation model, based on SPSS and AMOS software, according to the path coefficients of latent variables and observed variables in the model, the paper determines the impact process of 20 influencing factors at Heilongjiang Province at the government, enterprise and resident level on the economic, environmental and social performance of urban land use system. The results show that the main influencing factors are the importance degree that industrial enterprises attach to low carbon technological innovation, the government’s supervision and management on the pollution discharge of industrial enterprises, residents’ awareness of energy conservation and environmental protection. The system diagram and SEM realize the comprehensive design of the land use system in Heilongjiang, and take the interaction between the internal factors of the system into account.
Analysis of the current navigation environment and Countermeasures in the northern waters of Zhoushan
Authors: Chen Yijin , Yin Mingyu , Zhong Lufeng , Huang Jinjie , Wang Jiahong
Published: March 2020

with the vigorous development of Zhoushan port logistics industry, the rapid expansion of port shipping economy will inevitably lead to the problems such as the complexity of the ship type and the increase of the number of ships in Zhoushan waters. The continuous increase of the number of import and export ships to grasp the impact of the ship dynamics and tide in this area on the ships plays a crucial role in the navigation safety. This paper mainly aims at the existing navigation conditions in the northern waters of Zhoushan, analyzes the navigation environment, studies the representative ship types of the navigation ships in each main channel, the drift caused by the wind and current in the waters of each channel to the ship movement and the field conditions for the safe navigation of the ships, so as to understand and grasp the water environment of each channel and the whole channel in the northern waters of Zhoushan, and to protect the ships in the waters of the northern islands of Zhoushan. It is of great significance for ship navigation and logistics to be smooth and orderly.
A Study on Enhancing the Accuracy of P Wave Detection based on Double-Filtering Algorithm for Microseismic Signals from Underground Mines
Authors: Shi Yaqian , Zhang Da , Ji Hu , Dai Rui , Wu Yanbo , Wang Bin
Published: March 2020

Nowadays, intelligent mining is the global mining technology hotspot and the inevitable trend of mine development,especially in the environment where the safety, high efficiency and sustainable development of mines are directly restricted by the underground pressure disaster, which caused by high stress and mining disturbance. Microseismic monitoring technology is one of key technologies in underground pressure monitoring, which provides safety assessment on mine by analyzing microseismic signals to obtain their source location. The accuracy of P-phase onset time plays a key role in source location, where short term average/long term average (STA/LTA) method is the most wildly used method in P wave detection. However, the microseismic signal is too weak that can easily be affected by noise from underground mining, and STA/LTA ratio is also highly influenced. In this paper, a double-filtering algorithm based on band-pass filter and synchrosqueezing wavelet transform is proposed to remove the noise from field microseismic data. The results show that the double-filtering algorithm can greatly enhance the effect of STA/LTA, where more accurate P-phase onset time is obtained at the same time.
On Rural Tourism and Its Present Situation of Development in Jiangxi Province
Authors: He Jianbo , Wang Zhen
Published: March 2020

As a special tourist item, rural tourism is an emerging development direction of tourism industry in China. Combining agriculture with ecology and tourism, rural tourism takes advantage of rural landscapes, rural production, rural eco-environment as well as rural ecology pattern for the purpose of attracting tourists to sightsee, study, experience, etc. Jiangxi is a great province in both agricultural resources and tourism resources. Hence, it is abundant in rural tourism resources. Starting from general conceptions of rural tourism such as concept, characteristics and development process, the paper analyzes in details the overall situation and resource advantages of developing rural tourism in Jiangxi in order to establish foundation for future development of rural tourism in Jiangxi Province.
Differential Game Research Based on Industrial Poverty Alleviation in E-Commerce Environment
Authors: Sun Lulu
Published: March 2020

This paper studies the decision-making of poverty alleviation investment in the supply chain system composed of agricultural suppliers and e-commerce sales platforms. Using the method of differential games, the changes of the equilibrium results of supply chain members in two cases are investigated and compared. The research shows that Under the Nash non-cooperative game situation, government subsidies can improve the degree of poverty alleviation efforts and the optimal benefits of supply chain members. The government subsidy coefficient τ only affects the poverty alleviation efforts and total revenue of agricultural suppliers and e-commerce sales platforms, and has no effect on the promotion efforts of e-commerce sales platforms.
Compressive strength and thermal conductivity of metakaolin geopolymers with anisotropic insulations
Authors: Jaya Nur Ain , Yun-Ming Liew , Bakri Abdullah Mohd Mustafa Al , Hussin Kamarudin , Yong Heah Cheng , Bayuaji Ridho , Mohd Tahir Muhammad Faheem
Published: March 2020

This research investigated the properties of thermally insulating geopolymer prepared using waste filler (fibreboard and rubber) to act as anisotropic pore/insulation. The geopolymer matrix was synthesised using metakaolin and an alkaline solution consists of sodium hydroxide solution and sodium silicate mixture. Geopolymers with varying content (0, 3, 5 and 7 layers) of coin-shaped fibreboard and expanded polystyrene are produced to examine the anisotropic insulation effect on the material characteristics. The compressive strength and thermal conductivity were determined experimentally. From the results, it is proved that the use of anisotropic insulations can improve the thermal conductivity and minimizing the reduction of compressive strength. Geopolymer incorporated with fibreboard had better performance in terms of strength while geopolymer incorporated with rubber had better thermal conductivity.
Seawater Exposure Effect on Fly Ash based Geopolymer Concrete with Inclusion of Steel Fiber
Authors: Yahya Zarina , Bakri Abdullah Mohd Mustafa Al , Jing Leow Yee , Li Long-Yuan , Razak Rafiza Abd
Published: March 2020

Concrete is widely used in construction offshore such as concrete floating bridges and sea tank. This research is providing an alternative construction material to replace ordinary Portland cement (OPC) concrete known as geopolymer. The geopolymer concrete was produced by mixing fly ash with alkaline activator and 3% of steel fibre in order to improve the properties of fiber reinforced geopolymer concrete (FRGPC). The effects of aging period in term of strength, changes in weight and carbonation of FRGPC in seawater is investigated and compared with the fiber reinforced concrete (FROPC). The compressive strength obtained for FRGPC were higher than FROPC. The highest compressive strength obtained by FRGPC is 76.87 MPa at 28 days and 45.63 MPa at 28 days for FROPC concrete. The compressive strength was decreased as the period of immersing the concrete in seawater is increased. During the immersion process of both samples in seawater up to 120 days, the carbonation was not detected even though with the existence of steel fibres.
Development of Geopolymer Ceramic as a Potential Reinforcing Material in Solder Alloy: Short review
Authors: Zulkifli Nadiah ‘Izzati , Bakri Abdullah Mohd Mustafa Al , Mohd Salleh Mohd Arif Anuar , Ahmad Romisuhani , Sandu Andrei Victor , Mohd Mortar Nurul Aida
Published: March 2020

Nowadays, the consumption of lead-free solder has been widely used around the world since the utilization of SnPb solder has been banned and restricted by European Union. Variety of studies have been conducted by the researchers to find an alternative to replace the usage of SnPb such as SnCu, SAC, SnAg and etc. However, the development of plain lead-free solder was declared to provide low mechanical, thermal, and electrical properties in terms of interfacial intermetallic compound and wettability towards its solder joint compare to the traditionally monolithic SnPb solder alloy. Mostly, previous studies stated that addition of some additives such as ceramic particles (Si
3
N
4, TiO
2, SiC, NiO and etc) may improves the solder joint reliability. At the same time, no major studies were done using geopolymer ceramic as reinforcing agent in plain matrix alloy. Therefore, this paper reviews the fabrication process of multiple geopolymer-based ceramic such as fly ash, kaolin, and slag as reinforcement in solder alloy. The development process includes the processing method of geopolymer ceramic and the characterization of geopolymer ceramic as reinforcing material consist of; i) chemical composition, and ii) phase identification.
Mechanical Properties of Coconut Shell Reinforced Unsaturated Polyester Composites with the Presence of Titanium Dioxide as Additional Filler
Authors: Shahidan Nurzarihah , Abu Bakar Mohamad Bashree , Mohamed Mazlan , Lazim Azwan Mat , Janvekar Ayub Ahmed
Published: March 2020

Unsaturated polyester (UPE) composites filled with coconut shell (CS) powder was prepared by compression molding technique. To improve the mechanical and physical properties of CS-UPE composites, titanium dioxide (TiO2) filler was added. CS also undergo two types of chemical treatment which were alkaline (NaOH) and silane treatment. Fourier transform infrared (FTIR) was used to investigate the changes of fibers chemical constituents after the two chemical treatments have been done. CS-TiO2-UPE composites was characterized with physical testing (density, water absorption and thickness swelling), mechanical properties (tensile and flexural test) and scanning electron microscopy (SEM). Overall, the result shows that, the presence of CS and TiO2 filler in UPE composites demonstrated the highest density. For water absorption and thickness swelling study, it was observed that the treated CS-UPE composites showed lower water absorption properties in comparison to those of untreated CS-UPE composites. The presence of TiO2 filler showed an increased in those water absorption properties but still low compared to CS filled UPE. Both chemical treatment of CS caused a significant increase in the tensile and flexural properties. The presence of TiO2 filler demonstrated a significant improvement in modulus properties but at the expense of strength properties. SEM investigation has shown that the surface modification of CS has better fiber-matrix interaction. Thus, chemical treatments on the CS improve fiber/matrix adhesion of UPE composites.
Food Waste Quantification and Characterization as a Measure towards Effective Food Waste Management in University
Authors: Kamaruddin Mohamad Anuar , Jantira Nurul Nadia , Alrozi Rasyidah
Published: March 2020

Globally, one-third of the food produced is wasted or underutilized which accounted for about 1.3 billion tonnes of food. If the food waste (FW) is disposed of in the landfill, it decomposes under the anaerobic condition that releases methane gas, a harmful greenhouse gas. FW is also referring as biodegradable materials where it has a higher moisture content that easily breakdown by the microbe and could produce odor problems. Thus, a study on FW generation rate and its characteristics were carried out. Physical and chemical characteristics of the FW which include the density, food waste composition, the generation rate, pH, moisture content, ash content, C/N ratio and the calorific value were determined based on the Malaysian Standard MS 2505:2012. Based on the field and laboratory work analysis, it was observed that the generation rate for the café A and B was between 0.04 kg/cap/day to 0.112 kg/cap/day and 0.01 kg/cap/day to 0.119 kg/cap/day. Meanwhile, the density of the FW was in the range between 0.035 kg/m3 to 0.077 kg/m3. Based on the standard method recommendation, 5 compositions were tabulated which include FW, plastic film, plastic rigid, paper and others (aluminum, steel and etc. ). Food waste demarcated was further divided into five categories such as rice, noodles, vegetable, shells and meat & bones. Rice and noodles produced the largest amount which was 52.50% and 55.52%. Moisture content and an ash content of the FW was recorded at 71.52% and 25.31% where it was slightly acidic (6.16) in nature. The calorific value for wet and dried FW was 4539.914 kcal/kg and 2091.3 kcal/kg. Based on the result obtained, the suitable method to treat food waste from the cafeteria was proposed.
Impact of network expansions on energy losses in compressed air
Authors: Perz Karolina , Rewolińska Aleksandra
Published: March 2020

Compressed air is a very widely used energy medium, used in various fields. Is one of the most widespread, but also one of the most expensive working media used in modern industry. According to studies available in the literature in Australia and the European Union, energy consumption by compressed air systems accounts for about 10% of total industrial energy consumption, while in the United States it accounts for 30% of total electricity consumption. In addition, these systems are one of the least efficient forms of energy - only about 10-30% of the energy generated by the compressor reaches the end point. This is primarily due to a change in the form of energy (e.g. heat), but also leaks in the network and inefficient use. During operation in the compressed air network, pressure losses (linear and local) occur as a result of pipeline construction as well as pressure losses caused by the use of devices and elements responsible for maintaining adequate air quality (local losses) in the network. The pressure drop caused by the pipeline elements will depend on the extent of the network, the diameter of the pipeline, the number of places where there is a change in the direction of air flow (elbows, venturi, etc.). However, the losses caused by the use of treatment elements will depend on the expected air quality (number of filtration stages, appropriate air dryer) as well as on the network operation time (e.g. air filter contamination). The purpose of this study is to determine the impact of compressed air network extensions on energy losses resulting from, among others friction during flow. The values of these losses depend on many parameters such as efficiency, air flow speed, diameter and length of the pipeline. Knowledge about the correlation of these parameters will allow for proper selection of compression devices, as well as for optimal design of the pneumatic network.
Automatic systems supporting research on modern materials and industrial bonding technologies
Authors: Wojciechowski R , Bąkała M , Rylski A
Published: March 2020

Industrial bonding technologies, including soldering and brazing, operate on solid-liquid phase boundaries. Commonly applied in many areas of industry (such as electronics, metallurgy or aviation), these bonding processes rely on the wetting of joining surfaces using a liquid bonding material. Understanding the wetting process and quantitative description of its parameters enables the design of new materials and joining technologies, as well as the optimization of existing methods. From the primary interfacial impact parameters, i.e. the contact angle and surface tension, the dynamics of the wetting process can be determined, including adhesive tension. This article investigates two independent measurement systems for wetting parameters in industrial brazing technologies: the sessile drop method and the Wilhelmy plate method. Both methods can be applied effectively in research on wetting processes. The measurement systems are compared in an example study.
Influence of quenching temperature of the individual quenching method on the geometrical dimensions of the elements
Authors: Wołowiec-Korecka E , Zgórniak P , Brewka A , Krupanek K
Published: March 2020

The quenching process is related to the internal-stress phenomena, resulting in geometric changes (distortions). In this paper, the impact of hardening temperature on the quenching distortions occurring during low-pressure carburizing with gas quenching using the individual quenching method was analyzed. The reference elements were subjected to carburizing at 980°C, followed by gas quenching at temperatures of 860°C, 920°C and 980°C. The geometrical measurements of the elements were made before and after the chemical treatment and the size of the quenching distortions of their geometrical parameters was determined: external and internal diameters as well as ring thickness. The study examined whether there is a statistically significant difference between the geometrical dimensions of the elements before and after the thermo-chemical treatment for the elements in three temperature groups. It was shown that for the ring thickness parameter there are no significant differences between the groups of elements before and after heat treatment for the temperature 980°C, while for the temperature 860°C and 920°C these changes are significant. However, for external diameter bottom, there is always a difference regardless of temperature. For the single piece-flow vacuum carburizing with gas quenching using the individual quenching method, it is advisable to use the highest possible quenching temperatures to reduce quenching distortions.
Sound Recognition of Four Stroke Manual Transmission Motorcycle Engine’s Damage
Authors: Santoso H
Published: March 2020

Sound recognition that learns about the source of a sound, which is then used as a reference in learning. Sound recognition referred to in this study is the sound produced from the sound of a motorcycle engine. From the sound of the engine, the sound is then studied more and the results of the recorded sound are then used as objects of research. The management of motorcycle engine sound is carried out using Matlab and assisted by using the HMM (Hidden Markov Model) method with GMM (Gaussian Mixture Model) where HMM is used as chain pattern formation and GMM is used as a sound matching pattern. In this study indeed really learns from every sound of a motorcycle engine that will be used as a sample in the laboratory. From the sound of a motorcycle engine that is heard by the human ear can already indicate the conditions and eligibility limits of the motorcycle. Therefore, from this study trying to find answers to each condition and type of damage from a motorcycle through the sound of a motorcycle engine. With this research, it can help the vehicle owner, because the results of this study warn the vehicle owner to immediately conduct a scale check at the nearest official workshop and from this study also provide benefits and benefits for researchers and motorcycle vehicle owners to find out the condition of the damage early vehicles and help prevent them so as not to cause severe damage which can add air pollution in the city of Dili, East Timor. And the results of existing research are very helpful both for researchers, mechanics and motorcycle vehicle owners.
LoRa Gateway as Internet of Things (IoT) Infrastructure Components on Undip Vocational School
Authors: Tadeus D Y , Yuniarto  , Mangkusasmito F
Published: March 2020

Internet of Things (IoT) is a concept that aims to broaden the benefits of continuously connected internet connectivity. The IoT concept infrastructure can be built using existing digital communication standard protocols such as Wifi, Zigbee, Bluetooth, but these three standards have limitations in terms of distance and power consumption. The LoRa communication protocol is a special communication standard that emphasises the aspects of long-distance, low power, low data transfer at relatively low prices. It utilises a gateway to forward messages from nodes. This research focuses on the implementation of open and low-cost LoRa gateway, which will be installed in the area of the Diponegoro University Vocational School Semarang. Communication functionality is tested using The Things Network server. The coverage range of gateway was tested by recording RSSI and SNR values received by the gateway. Test results show RSSI readings above -100 dBm at a radius below 100 m from the gateway. RSSI and SNR values appear to drop dramatically in low elevation conditions, especially if the position of the node-gateway is almost obstructed by the ground surface. The surface obstacle in the form of dense trees and thick buildings also contribute to reducing the quality of signal reception.
Multilevel Thresholding Image Segmentation based on Autonomous Groups Particle Swarm Optimization
Authors: Murinto
Published: March 2020

Multilevel thresholding problems based on Otsu criteria are discussed in this paper. One weakness of the Otsu method is that computational time increases exponentially according to the number of thresholding dimensions. In this paper, a modified Particle Swarm Optimization (PSO) algorithm called Autonomous Groups Particles Swarm Optimization (AGPSO) is proposed to reduce two problems trapped in local minima and a slow convergence rate in solving high-dimensional problems. AGPSO is used for multilevel thresholding image segmentation. The performance of AGPSO is compared with standard PSO on three natural images. The parameters used to compare the performance of AGPSO and PSO are SSIM, PSNR, Computation Time, optimal threshold obtained from each algorithm. From the experimental results show that AGPSO is better when compared to PSO in image segmentation, from the resulting fitness value and higher SSIM and PNSR values.
Detection of Mad Lazim Harfi Musyba Images Uses Convolutional Neural Network
Authors: Noeman A , Handayani D
Published: March 2020

Reading of Al Quran is an obligation for all Muslims. Lack of knowledge about the knowledge of recitation in reading the Al Quran is certainly a problem. The purpose of this study makes it easier for everyone to learn the law of recitation, especially Madd Lazim Harfi Musyba in the Al Quran verses. The method used is one of the deep neural network methods, namely Convolutional Neural Network (CNN), as real-time detection of the law of Madd Lazim Harfi Musyba, implementation of the method using the help of Tensorflow GPU (Graphic Processor Unit) library. The results of trials with the Deep Convolutional Neural Network model show the detection performance of 9 verses with an average accuracy of 93.25%. The conclusion is that the training data on the CNN model is very reliable in detecting the Mad lazim harfi musyba law. Therefore this system can be used to assist in applying the Mad Lazim Hafi Musyba legal recitation while reading the Al Quran.
QOS Analysis of Routing Protocol Babel on Mobile Ad-Hoc Network (MANET)
Authors: Wijayanto A , Adhitama R
Published: March 2020

The unequal access to internet communication infrastructure in most parts of Indonesia can cause difficulties for people in the area to communicate. As an alternative communication, the mobile ad-hoc network requires a reliable routing algorithm. Quality of service is vital to address the problem of communications in the mobile ad-hoc network. This study analyzes the quality of service routing protocol babel on a mobile ad-hoc network. Test carried out using 3 scenarios, namely testing feasibility condition, self-healing, and delay, jitter, packet loss, and throughput on multihop condition. Values delay and jitter generated by the scenario testing conducted according to the standards TIPHON into the category of a very good and good. In the packet loss data capture value generated by the scenario testing conducted according to the standards TIPHON into the category of good and bad, but most of the values obtained into the bad category. At throughput data capture value generated by the scenario testing conducted according to the standards TIPHON into the category of good, medium and bad but mostly the value obtained in the category of good.
Preservation potential of lemon basil essential oil on tofu: Development of a natural food preservative
Authors: Hamad A , Ramadhan M B , Dewi D Y S , Djalil A D , Hartanti D
Published: March 2020

The antimicrobial activity of lemon basil (Ocimum × africanum Lour.) has been described. This activity can be elaborated further and possibly applied for natural foods preservative. In this study, the constituents of lemon basil essential oil were analysed, and its preservation potential on the tofu was evaluated. The essential oil was distilled from dried plant materials using a steam and water distillation process. The constituents of essential oil of lemon basil were analysed by Gas Chromatography-Mass Spectroscopy (GC-MS) technique. Its application for preservation of tofu was evaluated based on its capacity in inhibiting the growth of bacteria on the tofu as well as the physical observation of the tofu during ten days of preservation at room temperature. The lemon basil essential oil constituted of 21 constituents, with a high fraction of oxygenated compounds, including neral and geranial, were detected. Lemon basil essential oil at an optimum concentration of 3.125 mg/ml inhibited the bacterial growth on the tofu during storage and improved its shelf life up to 4 days.
Mass Transfer Coefficient Study of Shogaol Extraction in Ginger Using Subcritical Water
Authors: Yulianto M E , Amalia R , Paramita V , Hartati I , Nisa’ Q A K
Published: March 2020

Ginger (Zingiber officinale) has bioactive components such as shogaol and zingerone which are able to mediate cardiac contractions, are antioxidant, antiproliferative and apoptosis. To increase the economic value, it is necessary to develop a process of extracting ginger active compounds through subcritical water. The superiority of hydrothermal extraction by using water is easy to get, cheap, abundant availability, high purity, non-toxic and easy to handle. This study aims to obtain data on the mass transfer coefficient of the extraction process of ginger bioactive compounds such as shogaol through subcritical water. These data are very much needed in the design and scale-up of the extractor tool. The results of the study show that hydrothermal extraction using subcritical water can increase the content of Shogaol compounds, compared to conventional extraction processes such as soxhletation, percolation, supercritical fluid extraction, microwave extraction, and ultrasonic extraction. Mass transfer coefficient (Kla) in the model mass transfer extraction of shogaol, ginger using subcritical water respectively 3,7503 s−1, 3,6912 s-1, 0.31435 s-1.
Landslide Analysis Study and Cisewu Countermeasures in District, Garut Regency, West Java
Authors: Salimah A , Ammar M , Rahmawati D , Yelvi  , Tri Widya S
Published: March 2020

Cisewu-Garut is one of the landslide-prone areas in Indonesia which occurs almost every year, particularly in the rainy season. The landslide in this study takes place in the slope where a BTS tower is located. The peripheral fence is hanging due to ground movement, while housings stay beneath the foot of the slope. This problem could harm its surroundings and needs immediate countermeasures to prevent any hazard. At the initial stage, a survey is conducted to investigate slope condition, soil state (including soil test), and drainage. Based on available soil data, the second stage is slope stability analysis by creating a model corresponding to real condition data using the element method to Plaxis2D software. As for the third stage, a landslide disaster prevention is established by strengthening the foot of slope using gabion and retaining walls. The gabion wall cage dimension would be 5m wide and 2.5m tall. Two retaining walls by the size of 2m high to 1m wide and 1m high to 0.6m wide are build. The result of slope stability analysis is an increase of safety factor by 1.729, which existing factor is 1.244. The countermeasures also involve drainage refinement and water flow diversion so that water will not penetrate to landslide zone.
Effect of change of channel width in the downstream of the check dam on controlling sedimentation in Mrica Reservoir
Authors: Ulfiana D , Wulandari D A , Parmantoro P N , Susilowati
Published: March 2020

The increasing sedimentation of Mrica reservoir shows that the sedimentation control has not been effective. The sedimentation control has been made include the disposal of sediments that settle in the reservoir by dredging or flushing. However, the results are not optimal. This is caused by the large volume of sediment entering the reservoir each year. The controlling volume of sediment that goes into the reservoir has also been carried out by conducting a watershed conservation program and building a check dam in the upstream Mrica reservoir. However, the existing check dam is still less effective in controlling sediments, especially suspended load sediments, that are transported in the river. Therefore this study was carried out by adopting the sediment trap concept to deposit sediments that escaped from the check dam. This study simulated changes in the width of the downstream channel of the check dam by three variations using HEC-RAS. There was a width of 20%, 40%, and 60% wider than the initial width. The results showed the effect of changing the channel width on volume sediment deposited. Based on the results of the study, the change in width to wider than the initial width could increase the volume of sediment deposits.
Regional Food Hubs For Distribution of Regional Food Logistics (Case Study on the Establishment of a Food Distribution Center in Banten Province, Indonesia)
Authors: Winarno H , Perdana T , Handayati Y , Purnomo D
Published: March 2020

Agriculture has a strategic role in sustaining the economy of a region, especially in improving food security and production of agricultural products. Food Hubs plays the role of building a food system that is capable of aggregating, distributing and connecting farmers with consumers directly. This requires the role and management of effective distribution methods by integrating the roles of farmers and consumers in a distribution center. The Distribution Center (DC) is managed by a Regional-Owned Enterprise (BUMD) that assists farmers in producing, selling and distributing food. Distribution Centers are able to overcome the problem of stock scarcity, price disparity, and price fluctuations in goods - especially staples. The Food hubs are supported by the determination of the number of warehouses, warehouse locations, and warehousing standards for the management of food staple inventory warehouses. Besides determining the level of inventory of safe food staples (buffer stock) is based on the main parameters: lead time and demand requirements. Food Hubs Operations embody the role of farmers, traders, in supporting the activities of distribution centers managed by Regional owned enterprises. Food hubs interactions involve institutions that play a role in sustaining these activities.
One pot synthesis of ZnO hexagonal bugle beads in a closed polypropylene vessel: a simple hydrothermal way of synthesizing nanocrystalline ZnO photocatalyst for waste water treatments
Authors: Malik Khurshaid Ahmad , Tomar Radha , Malik Javied Hamid , Zaman M Burhanuz
Published: March 2020

Here, we report a novel and eco-friendly synthesis of zinc oxide (ZnO) hexagonal bugle beads in a closed polypropylene vessel. To the best of our knowledge, we are the first to report synthesis of ZnO nanostructures in a closed polypropylene vessel (a simple hydrothermal reactor). Structural, morphological, compositional and optical properties of the nanostructures were studied. X-ray diffraction (XRD) results demonstrate that ZnO nanocrystals grow in a single crystalline hexagonal phase. Scanning electron microscopy (SEM) reveal formation of nano-dimensional hexagonal bugle beads (base diameter ∼70 nm). The ZnO nanostructures were used to carry photocatalytic degradation of methylene blue (MB) dye. The beads show high photocatalytic performance against MB dye and degraded 89% of the dye in 120 min of UV light irradiation. The reusability test of zinc oxide bugle beads determine high stability of the photocatalyst.
Prenatal Treatment of Congenital Cytomegalovirus With Valganciclovir: A Case Report
Authors: DeNoble Anna E , Saccoccio Frances M , Permar Sallie R , Hughes Brenna L
Published: March 2020

Cytomegalovirus (CMV) is the most common congenital infection and infectious cause of fetal anomaly and neurologic injury. However, treatment strategies for congenital CMV (cCMV) infection during pregnancy remain elusive. We report a case of hydrops fetalis secondary to cCMV infection with minimal sequelae after maternal and subsequent neonatal treatment with valganciclovir.