bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on multi-dimensional target time series prediction model for power grid infrastructure projects
Authors: Zhang Jian , Jin Xianing , Song Yi , Yang Weihong , Zhang Mingli , Gao Jing , Yang Bo , Li Zhanjun , Wang Yihe
Published: July 2019

In order to adapt to the changes in the external power industry environment, prevent external audit supervision risks, and deepen the internal lean management level, we take the investment statistics of power grid infrastructure projects as the entry point, scientifically regulates investment statistics, and focuses on solving the distortion of investment statistics and the problem of the department not cooperating. By constructing the multi-dimensional target timing sequence prediction curve of investment statistics, the paper provides reference for the reported value of investment statistics, improves the authenticity and reliability of investment statistics, and at the same time, deepens the investment statistics management, providing solid support for the lean management and control target of power grid companies.
Pit-retaining Structure Construction Technique of H-shaped Steel Anchor Composite Pile- Prefabricated Wallboard Adopting Compaction Grouting Method of a High-rise Building in Guangzhou
Authors: Gao Luheng
Published: July 2019

Taking the deep excavation engineering of a tall building in Guangzhou as an example, this paper introduces the pit-retaining structure construction technique of H-shaped steel anchor composite pile- prefabricated wallboard adopting compaction grouting method. The main construction process of this technique includes: (1) surveying setting-out to fix piles’ locations, (2) hoisting piles into place and adjustment, (3) H-shaped steel piles driving, (4) layered and segmented excavation and pile body treatment, (5) layered and segmented drilling anchor stocks one by one from top to bottom, (6) hoisting prefabricated wallboard in position, (7) inserting reinforcement and binding firmly with protruding bar of precast wallboard, (8) layered and segmented high pressure grouting, (9) pouring expansive concrete at joints,(10) repeated step(4) to step (9), (11) steel bar binding of middle beams, framework supporting and concrete grouting, (12) acceptance check. This method utilizes the integral foundation pit enclosure structure formed by the H-shaped steel pile, anchor rod and precast wallboard and the construction follows the principle of layered and segmented excavation, setting anchors step by step and grouting immediately after hoisting, which realize the assembly construction of the foundation pit enclosure structure and can effectively saving time, retain soil and seal water.
Benefit evaluation of power substitute project for industrial users
Authors: Zhang Xinhe , Luo Guoliang , Zhang Jiaxin , Liu Qiang , Hu Ruoyun
Published: July 2019

Power substitution in industrial field is an important measure for Chinese government to control air pollution, and how to evaluate the benefit of electric energy substitute project effectively is related to the effectiveness of this measure. In this paper, the Comprehensive Benefit evaluation index system of industrial electric energy substitution project is constructed from three dimensions of economy, environment and society, and in order to avoid the deficiency of single comprehensive evaluation method, a combinatorial model based on anp-entropy method and improved TOPSIS method is established. Finally, the rationality of the evaluation method is verified by an example.
Low-cost Drilling Technology for Horizontal Wells with Atmospheric Shale Gas in the Outer Margin of Sichuan Basin
Authors: Zhang Guohui , Chen Rong , Hu Gui , Huang Weihe , zhang Xiwen , liu Hai
Published: July 2019

Shale gas reservoir at the outer edge of Sichuan basin belongs to normal pressure shale gas reservoir. In the analysis of the difference between the current and the pressure shale gas drilling, the technical measures to reduce the cost of drilling, the design of the well, the borehole trajectory, the drilling, the drilling fluid and the cementing process, the design of the three shafts, the design of the structure of the shaft, the design of the two dimensions of the well, the design of the two dimensions, the design of the orbital trajectory of the shafts, using the spin guide technology to control the orbital trajectories of the two shafts, the low-oil, and the optimal production of the concrete and the production of the drilling and the drilling costs, the technology and the measures, to provide the technical support for the economical and efficient development of the natural gas in the Sichuan basin.
Study on Line Sail in the Process of Double-guided Parachute Deployment
Authors: Zhang Mingliang , Gao Puyun
Published: July 2019

Double-guided deceleration parachute is widely used in large-scale space return activities. Compared with single-guided parachute, it has higher security, but its structure is more complex. This paper aims to study on line sail and analyse the effects of different initial dynamic pressure, separation speeds and angles of attack on the phenomenon during double-guided parachute deployment. The results show that for the double-guided parachute, the bigger the dynamic pressure of the return cabin is, the smaller the separation speed is, the bigger the angle of attack is, the more serious the line sail phenomenon will be.
The research and application of compound flooding system in the block L of Huabei oilfield
Authors: Shanshan Gao , Linlin Xie , Peilei Chen , Rui Wang , Chuancheng Liu , Fei Cao , Zhiqiang Wang , Xiaoyang Lei
Published: July 2019

In the three rounds of gel flooding of the block L in Huabei oilfield, better effect of watercut decreasing and oil increasing had been achieved. In order to further develop the remaining oil potential, an oil-displacement slug was added on the basis of the gel slug, to form a compound flooding system in order to improve the oil displacement efficiency. Two types of oil displacement agents were optimized through basic performance evaluation. NO.I is surfactant. When the concentration was 0.3 percent, the oil-water interfacial tension could reach 1.15 ×10−3mn/m and still remain within the ultra-low interfacial tension range after 150 days under formation temperature but the static adsorption loss was only 3.4mg/g. NO.II is a kind of granular oil displacement agent with certain sealing ability.The initial particle size was 189nm and the size reached 520nm after hydration for 30 days and remained stable. In the sand filled tube with a permeability of 550×10−3μm2, the plugging rate was up to 70.88 percent. Through the double tube with high-low permeability core experiments, the oil displacement effect of movable gel, movable gel with oil displacement agent I and movable gel with oil displacement agent II were further compared. The results showed that movable gel with oil displacement agent II could improve oil recovery by 20.95 percent compared with water flooding, 7.88 percent compared with movable gel and 5.92 percent compared with movable gel with oil displacement agent I.The composite flooding system was applied in the block L with 6 wells and the effect of watercut decreasing and oil increasing was significant. The daily oil increase in peak period was 10t, and the watercut was decreased by 5.3 percent. The accumulative oil increase was 2736 tons with 13 months validity and will continue to be effective.
Water Utilization’s Green Efficiency Evaluation and Spatial Autocorrelation’s analysis in Jing-Jin-Ji region of China
Authors: Biao Hu , Bowen Jiao
Published: July 2019

Based on the data of 13 cities in the Jing-Jin-Ji region from 2009 to 2018, evaluating green efficiency of Water Resources by SBM Model, and analysing this region’s spatial autocorrelation by ESDA method. The results show that the green efficiency of water resources in Jing-Jin-Ji region shows a slow decline in fluctuation, with an average annual efficiency of 45%. Spatial autocorrelation is characterized by low agglomeration around Beijing and Tianjin, and decreases year by year.
Quantitative Analysis on the Electrification Process of China
Authors: Kuan Zheng , Junshu Feng , Jinfang Zhang , Guanjun Fu , Jun Liu , Jiangtao Li , Zhicheng Xu
Published: July 2019

The electrification of energy production and consumption has become a strategic choice of global energy transition, since electricity can be transformed from a massive renewable energy efficiently, and also be helpful to boost the overall level of energy efficiency. In this paper, it presents the promotion of the electrification to the energy transition, and analyses the basic conditions of China’s continuous upgrading of the electrification level. Based on the international comparison, the trend of the future global electrification process is identified, and the strategic path of China’s electrification is proposed through the 3E energy consumption prediction model and the energy and electricity optimization planning model. It is of great significance to provide a decision support that accelerating energy transition and development of electrification in China thoroughly and efficiently.
Technical inspection of high strength bolts in hydropower plant: nondestructive examination
Authors: Li Wenbo , Liu Lanlan , Wang Yusen , Chen Junjun , Xie Yi , Hu Jiarui , Sun Lipeng , Long Yi
Published: July 2019

Bolt connection is widely used in hydraulic power plants as an important connection mode of metal parts. However, the phenomenon of bolt breakage often occurs in hydropower plants, which seriously affects the stable operation of hydropower plants. During the maintenance of the unit, non-destructive testing of high-strength bolts is able to effectively detect the bolt defects and ensure the safety of the unit
Study on the spatio-temporal relationship between ground fracturing and underground drainage holes arrangement
Authors: Qianqian Ma , Xiaogang Fan , Zhengxing Fan
Published: July 2019

Based on the respective technical advantages of ground fracturing and underground gas drainage, a joint drainage mode of ground wells and underground is proposed, which focuses on utilizing the large-scale advantages of ground fracturing to promote underground gas drainage. Experimental study of two kinds of ground fracturing and underground drainage connection Mode, that is “Ground fracturing lags behind drilling construction” and “drilling construction lags behind the ground fracturing”. Through the micro-seismic method and the underground hole exposure method, it is concluded that the cracks in the coal seam are mainly horizontal cracks with a small northeast opening, and the crack length is about 158~203m. According to the law of crack distribution, fracturing investigation schemes of two modes were designed. The reasonable time connection between the ground fracturing and underground drainage is preliminarily determined by the engineering practice, it is effective in increasing the permeability of the coal seam, reducing the abnormal gas emission from the coal seam and the risk of coal and gas outburst by using “ground fracturing lags behind drilling construction”; the gas drainage effect is remarkable when the underground drilling is delayed within 3 months of ground fracturing by using “drilling construction lags behind the ground fracturing”.
A logistics company transportation solution research
Authors: Jia XiaoPeng , Zhang ZhiHao Cui , Yuan LingBo , Qi ShaoSong , Tian YinHui
Published: July 2019

The operation of the logistics company called A is highly dependent on a steel group. A logistics company’s exploration of the external market is not ideal. Especially with similar logistics companies, there is no advantage. As the overcapacity of the steel industry is becoming more and more obvious, freight price rise, the labor cost rises, and the profitability of the enterprise decreases. Therefore, the benefits to logistics have become the key development direction of many steel companies. Other steel logistics companies have also undergone multiple levels of change. First we analyze the problems of A logistics company; Then we find the company’s advantages. of A logistics company; Finally, the transportation solution was designed from three aspects: operational process design, transportation mode design and transportation plan implementation.
Research on Hedging Ratio of Power Futures Based on 0LS Model
Authors: Yang Jie , Xu Tianqi , Li Yan , Ying Feixiang , Zhang Hongtao
Published: July 2019

With the further development of power market reform, the demand for energy trading entities to avoid the risk of electricity price is becoming more and more prominent. This paper uses the method of minimizing the variance of the portfolio return rate combined with the electricity futures price data from the European Energy Exchange to estimate the optimal hedging ratio and perform the residual test. Finally, the decision of power producers to use the power futures hedging strategy to avoid the risk of spot price fluctuations will be discussed.
Simulation Analysis of Annual Pollution Load of Combined Sewer Overflow in Wuhan City Based on SWMM
Authors: Chen Xuejiao , Jiang Yinghe , Yang Fengkai , Xu Tianhui
Published: July 2019

With the acceleration of urbanization, the urban water environment problem has become increasingly severe. The combined sewer overflow(CSO) pollution control has become the focus and problem which urgently needed to be solved in China’s sponge city construction and black smelly water treatment. Simulating and calculating the annual pollution load of the CSO is of great significance for the quantitative analysis of the cause of the water environment pollution. In this paper, the improved SWMM model coupled with the module for scouring the silting on the bottom of the pipes was used to simulate the combined sewer system with a drainage area of 1666ha. The results show that under the same drainage area, the larger the interception ratio is, the smaller the annual pollution load of CSO is; under the same interception ratio, the larger the drainage area is, the smaller the annual pollution load of CSO is. For the combined sewer system in Wuhan, the annual COD, TN and TP load of CSO can be calculated by three formulas: WcoD=378.58-33.71lnF, W
TN
=51.032-5.7871/lnF and WTP
=13.667F-0.404, respectively when the interception ratio is equal to 1.0.
Preparation and properties of waste-solid based foam concrete energy-saving materials
Authors: Ji Jun , Liu Xiaosheng , Tan Shengying , Ni Wen
Published: July 2019

In this paper, foam concrete is prepared from industrial waste such as steel slag (SS), blast furnace slag (BFS), flue gas desulfurization (FGD). By studying the stability of foaming agent, the specific surface area of cementing material and curing temperature, the insulation performance of foamed concrete can be improved. The test results show that the HT composite foaming agent has good stability at a high temperature and can be used as a foaming agent for waste-solid based foam concrete. Increasing the specific surface area of the material and increasing the curing temperature of the material can reduce the thermal conductivity of foam concrete. The thermal conductivity of the cementitious materials prepared by the A350 and A500 two-layer cementitious materials at 70 °C are: 0.083 W/(m-k) and 0.078 W/(m-k), respectively, which all have a good heat preservation effect. As the coefficient gap between the two is not large. In order to reduce the energy consumption caused by grinding, the A350 material can be used for exterior wall insulation.
Research on Scheduling Model and Control Strategy of Ice Storage Air Conditioning in Urban Power Grid
Authors: Meng Liming , Chen Lei , Jiang Tuo , Xu Fei , Yao Xingchen , Hao Ling , Yang Shuai
Published: July 2019

In this paper, a two-layer scheduling model for ice storage central air conditioning is established: the system level optimization control of the upper layer and the energy management system of the lower massive decentralized air conditioning system. The system level consists of thermal power, hydropower, wind turbines and ice storage air conditioning polymerization models, with the goal of minimizing the abandonment of wind and water, generating the scheduling results of generator set and ice storage air conditioning, and delivering them to the lower energy management system; After receiving the scheduling result issued by the upper layer, the large-scale ice storage air-conditioning is dispatched by the load aggregator, and the minimum scheduling deviation is targeted, and the direct load control is performed under the condition that the user comfort is satisfied to complete the upper-level scheduling plan. Through simulation examples, it is proved that the ice storage air-conditioning realizes the effectiveness of the disposal of abandoned water and abandoned wind under the premise of ensuring user comfort.
Principle analysis of torque ripple test bench for electric machine for electric vehicle application
Authors: Yang Guohui , Zhang Shuo , Zhang Chengning , Yang Yongxi
Published: July 2019

The torque ripple is mainly caused by the interaction between the stator magnetomotive force of the motor and the magnetomotive force harmonic of the rotor. With the gradual improvement of the comfort and stability requirements of the passenger car, the vibration and noise of the drive motor for the electric vehicle and ripple impact and other indicators affecting the comfort of the vehicle are receiving more and more attention. On the basis of ensuring the output torque capability of the motor, further improving the quality of the motor is one of the important purposes of the project research. At present, the research on the motor torque ripple measurement method is not perfect, and the motor test equipment cannot eliminate the interference of the load fluctuation on the motor torque test and cannot be accurately measured. In this paper, the load dynamometer and elastic coupling by simulating the input and output torque are studied, angular velocity and angular acceleration on the basis of previous research on torque ripple test at home and abroad. The influence of load dynamometer and elastic coupling on the test structure is studied and the test system of no-load dynamometer and elastic coupling is determined.
Study on heterogeneity characteristics of oil and gas reservoirs
Authors: Jiaqi Li
Published: July 2019

In order to meet the needs of fine adjustment of oilfield development in ultra-high water cut period, the heterogeneity characteristics of reservoirs after well pattern infilling are studied, and the reservoir heterogeneity is evaluated qualitatively and quan itatively. The target block is dissected by the method of cyclic correlation,and the type of sedimentary environment and the number of sedimentary units of the target reservoir are determined. At the same time, through the permeability characteristics of each sedimentary unit, the heterogeneity characteristics of sand body in three aspects, i.e. interlayer, plane and intralayer, are analyzed, which provides an important basis for fine water control and tapping potential of target reservoirs in this block.
Technical application of typical integrated energy mode
Authors: Wu Guopei , Wang Lu , Zeng ShunQi , Liang PeiQuan , Guo ZiXuan
Published: July 2019

With the wide application of distributed energy, new energy, smart grid and internet, integrated energy has become the main form of energy utilization in cities and parks. This is also an important way to promote regional green development and improve energy efficiency. In this paper, the main development modes and characteristics of integrated energy in cities, parks and islands are described. Under different modes, the main links needed for comprehensive energy allocation are decomposed, and the implementation of various technical means is studied and analyzed.

Finally, in this paper, typical practical project cases are analyzed on the main structure and parameters. These characteristic are proved by describe and calculation of these projects. Suggestions for integrated energy development are offered.
Color of Oxidative Pressure Leaching Liquor: A Case of Sphalerite
Authors: Guo Yaqin , Liang Duoqiang , Deng Yong
Published: July 2019

In lab-scale experiments of oxidative pressure leaching of sphalerite, an interesting phenomenon is that the leaching liquor looks three main colors: black, red and green. In on-going work, semi-quantitative study is carried out to investigate such phenomenon, including drawing of predominance area color diagram, effect of sulfur surfactant on color of leaching liquor, color and stability of oxidation of leaching liquor. Experimental results show that color of the leaching liquor depends on leaching condition mainly including temperature, dissolved oxygen concentration, that experimental results show sulfur surfactant has no effect on the color of leaching liquor, that, with increased molar ratio of elemental sulfur and sodium sulfide,

S
x

2
−

, x = 1 ∼ 8 is more stable, and that in oxidation of aqueous sulfide anion, to achieve reasonable fast oxidation kinetic, temperature of 150 °C and oxygen pressure of 2 × 105 Pa is the minimum required conditions, which is coincide with such conditions to achieve reasonable fast oxidation kinetic in oxidation of aqueous ferrous iron. In this paper, different reaction mechanisms in given leaching condition were discussed.
Phosphogypsum pyrolysis with mineralization agent under weak reducing atmosphere
Authors: Feng Hui , Xie Rongsheng
Published: July 2019

Batch experiments of phosphogypsum (PG) pyrolysis were carried out under weak reducing atmosphere, adding coke as reductant and CaF2 as mineralization agent. As 3 wt% CaF2 was added to the mixture, the optimal parameters of PG decomposition were mole ratio (C: CaSO4) 0.7, reaction temperature 950 °C, pyrolysis time 60 min, and 1.9-2.2% oxygen content of inlet gas. Under this condition, the decomposition ratio of CaSO4 was up to 90.6%, the SO2 conversion was 70.4%, and the average volume concentration of SO2 was 11.9%. With the aid of CaF2, the pyrolysis temperature of CaSO4 decreased significantly. The surface structure and morphology analysis revealed that CaF2 was beneficial to the pyrolysis efficiency of CaSO4. TG curve, XRD analysis and kinetic process have proved that the generation of intermediate substance CaS is the first stage for thermal decomposition of CaSO4, and CaO is the end product of CaSO4 pyrolysis under weak reducing atmosphere.
Energy Revolution and the Energy Demand Side Management in China
Authors: Xu Shengqing
Published: July 2019

China’s energy revolution has put forward new requirements for energy demand side management. For a long time, China’s energy demand side management lacks legalized and institutionalized policy and legal guarantee, which inhibits the role of energy demand side management in promoting sustainable economic and social development and energy structure transformation and upgrading. Based on the analysis of the status of China’s energy demand side management policies and laws and the existing problems such as low level of legislation, poor operability and focusing on power demand side management, suggestions on the legislation of China’s energy demand side management are put forward.
Application of EXCEL Univariate Solution Function in Thermal Calculation
Authors: Cai Wen , Lu Jin , Chen Lin Guo , Chen Wen , Wan Zhong-hai
Published: July 2019

The univariate solution solves the problem of solving the independent variable when the dependent variable result is known. According to “ASME PTC6-1996 Turbine Performance Test Procedures”, the method of applying EXCEL univariate solution function is proposed, which can be used for thermal calculation without programming. This method can be easily applied to steam turbine performance test calculation and system correction calculation.
Transformer User Identification Method Based on Abnormal Point Detection and Large Data Clustering
Authors: Liu Chen , Wang Junping , He Zhongxiao , Wu Meng , Bai Jialing , Lian Libo
Published: July 2019

Solving the mismatch of transformer and users is a key step to promote the intelligent management of distribution network. The rapid popularization of big data technology makes it possible to achieve low-cost and high-efficiency transformer user identification. Since load transferring may occur during the operation of distribution network, the user data to be identified may be mixed with the operation data of other transformer users. If the users’ data of other transformers is not eliminated, the identification accuracy will be greatly reduced. In this paper, a transformer user identification method based on loacal outlier detection and improved k-means algorithm is proposed. Firstly, the analysis data is preprocessed by the local factor algorithm, the user data which does not belong to the transformer to be analyzed is eliminated. According to the characteristics of application scenarios, improved k-means algorithm is proposed, including determining the number of clusters, initial centroid and selecting correlation coefficient as the index of evaluating sample similarity. Finally, the k-means algorithm is used to cluster the pre-processed data to accurately identify the transformer users. Example results show that the proposed method can effectively improve the accuracy of transformer user identification and maintain high stability in different data environments.
An Energy-Efficient Routing Protocol for ZigBee Networks
Authors: Wang Qijin , Wang Dandan , Qi Xiaoxia
Published: July 2019

ZigBee networks have known battery-life problems, so, in this paper, we propose an energy-efficient routing protocol for them named LCF-ZBR (Low Formation of cluster ZigBee Routing). If the energy of one particular cluster head node is not sufficient, an alternative cluster head is used to preserve the residual energy of the original node, thus avoiding cluster head node failure due to excessive use. This will help to prolong the service life of the entire network. LCF-ZBR and ZBR energy consumption problems were simulated using NS2, and the residual energy and the number of dead nodes were compared. The results showed that the proposed energy-efficient routing protocol was more effective.
Economic analysis of solar and air energy systems for energy demand of space heating and domestic hot water of buildings
Authors: Fu Feifei
Published: July 2019

This study focuses on the economy of two renewable systems supplying the same demand of domestic hot water (DHW) and space heating (SH) for a city household located in Beijing of China. The systems are the solar thermal system and air source heat pump system. Both the two systems are considered for meeting the energy demand of SH and DHW. Optimized simulations are carried out to recognize the most economical configurations. The results show that, for a 15-year running time, the air source heat pump system comprising a 10 kW air source heat pump is the best configuration and has the minimum cost.
Uncertainty Analysis on Process Organized Emission Inventory in Petrochemical Enterprises of Hainan Province
Authors: Xie Donghai , Zhang Xiaxia , Han Qi , He Qingyang , Meng Xinxin , Li Feng , Zhou Kang
Published: July 2019

The study qualitatively and quantitatively evaluated the uncertainty of the emission inventory of SO2, NOx, particulate matter (PM) and non-methane volatile organic compounds (NMVOCs) based on the measurement method in the process of organized sources in eight typical petroleum refining enterprises in Hainan Province in 2017. According to the TRACE-P inventory grading, the activity level data uncertainty was between I and II, and the emission factor rating was roughly C-level. The qualitative assessment of the emission inventory is “good”. The Monte Carlo simulation model was used to quantitatively evaluate the uncertainty. The results show that the uncertainties in emission inventory of SO2, NOx, PM and NMVOCs are ±2.9%, ±6.3%, ±7.6% and ±13.7%, respectively, with the highest uncertainty in NMVOCs emissions. The study on emission inventory uncertainty will help decision makers to scientifically formulate air pollutant control strategies for the accessibility of pollutant emission reduction targets of petrochemical enterprises and guide the improvement of emission inventory and data collection.
Antagonistic Endophytic Fungi of Hedychium coronarium J. Koenig from Hutan Sibayak and Taman Hutan Raya, North Sumatra against Staphylococcus aureus ATCC® 29213TM
Authors: Lutfia A , Munir E , Yurnaliza
Published: July 2019

Possible role of endophytic microbes has been receiving much attention from different aspects and all plants are believed to have an endophytic association. Some medicinal plants have been reported to harbor endophytic microbes capable of producing bioactive compounds. Endophytes may benefit plant host by secreting similar bioactive compounds leading to systemic plant defenses through synthesis of antimicrobial compounds. In this study, we reported that rhizome of Hedychium coronarium J. Koenig (a member of Zingiberaceae), native of Hutan Sibayak and Taman Hutan Raya, North Sumatra, is inhabited by various endophytic fungi morphotypes. Total of 28 fungal morphotypes were recovered from rhizome parts and differentiated based on morphological characters. Most fungal strains displayed antibacterial activities ranging from 0,00 (no activity) to 30 mm (very strong activity) against Staphylococcus aureus ATCC® 29213™. Based on this preliminary result, we may propose some antagonistic strains as candidates for further study regarding to the production of antibacterial compounds.
Effectiveness of chitosan from crab shell as antibiotic for Escherichia coli
Authors: Boy E , Ummah Z A
Published: July 2019

Background: Research in finding a safe, effective and natural ingredient against Escherichia coli continues to be carried out as a result of an increasing antibiotic resistance. Chitosan has been known as a food preservative but the research for its effectivity against Eschericia coli is still inadequate. Indonesia is rich of natural animal resources including crustaceans, like Crab. Objective : How effective are chitosans extracted from crab shells as an antibiotic against Escherichia coli when compared with ceftriaxone. Method : Experimental method with a static group comparison where E. coli in Mueller Hinton Agar (MHA) on petri dishes was given chitosan intervention with initiating concentrations starting from 4% to 8% and 30mcg of ceftriaxone given by diffusion. The antimicrobial of E.coli was measured with Whatman paper and standard calipers measured in millimeters. Result : Results of normality and homogeneity variance tests with (p > 0,05) were inhomogenous and not distributed normally so it was analyzed with Kruskal Wallis Test continued with a Mann Whitney Test. Conclusion : Chitosan solution extracted from crab shells with concentrations of 4%, 5%, and 6% have an antibiotic effect against the growth of E.coli. The most effective concentration to inhibit E.coli is 4%.
Molecular subtyping and dna sequencing homology of Escherichia coli O157:H7 isolated from Aceh cattle
Authors: Abrar M , Ferasyi T R , Amiruddin  , Fakhrurrazi  , Erina  , Razali  , Sabri M , Abdullah H , Zainuddin  , Haris A , Safika  , Dewi M , Barus R A
Published: July 2019

Escherichia coli (E. coli) O157:H7 is one of bacteria that recognized as pathogenic agent, both in animals and human. Several isolates of this bacteria were obtained from local livestock, such as in bali cattle and aceh cattle. However, the bacteria found in aceh cattle has not been confirmed through molecular technique. The current study was aimed to confirm the finding of E. coli strain O157:H7 in aceh cattle using molecular analysis. Three isolates of E. coli O157 (MA-35, MA-44, and MA-58) obtained from aceh cattle were extracted for the DNA using Presto™ Mini gDNA bacteria kit (Geneaid) through several processing stages of sample preparation, lysis, DNA binding, washing and elution. Then, it was continued with DNA Amplification Using Polimerase Chain Reaction (PCR). DNA sequencing homology was conducted using BLASTN program. Data of this study were analysed descriptively. The results showed that one of isolate (MA-58) was detected for the presence of genes of rfb (339 bp), fliC (401 bp), and stx2 (115 bp). Then, this isolate has a homology of 100% to 16 different strains of E. coli O157:H7 sequence in the GenBank. In conclusion, the molecular analysis of the local isolate of bacteria of MA-58 obtained from aceh cattle confirmed that it is E. coli O157:H7 and detected with the presence of genes of rfb, fliC, and stx2.
Distribution of Nitrate, Phosphate, Dissolved Oxygen and Macrozoobenthos Density in Belawan River
Authors: Yeanny Mayang Sari , Barus Ternala Alexander
Published: July 2019

Belawan River has many community activities such as residential areas, industries, Steam-electric power station, PDAM (local water company) and aquaculture. With this activity the waste is directly discharged into the river water, causing negative impacts on its aquatic environment such as nutrients (Nitrate and Phosphate) and water quality (Dissolved Oxygen) and the state of aquatic biota (Macrozoobenthos). One approach is to use the Purposive Random Sampling method with 5 stations. The approach was in the form of Macrozoobenthos measurement, namely; measurement of density, relative density, and attendance frequency. Measurement of nutrients, namely nitrate, phosphate and measurement of water quality, namely dissolved oxygen. The research results showed that Macrozoobenthos obtained as many as 9 genera. The highest Macrozoobenthos density in the genera of Polymesodaerosa was 629.62 ind/m2 at station 4, and the lowest was in the genera of Melanoides sp (Station 1), Macrobrachium sp and Melanoides sp (Station 2), Hirudo (Station 4), and Scylla sp (Station 5) with a density of 3.703 ind/m2. Based on nutrient nitrate concentration of 1.18-7.57 mg/l, it is included as mesotrophic and eutrophic waters, based on phosphate concentrations of 0.14-0.18 mg/l, it is included as hypertrophic, and dissolved oxygen of 3.8-5.3 mg/l is included as good water oxygen conditions.
Microsatellite analysis on oil palm (Elaeis guineensis) tolerance to Ganoderma boninense
Authors: Basyuni M , Afandi D , Hayati R , Bimantara Y , Arifiyanto D , Syahputra I
Published: July 2019

Palm oil plants (Elaeis guineensis) are nowadays an economically significant crop. Oil palm plantations in Asia, especially in Indonesia and Malaysia encounter the threat of basal stem root (SBR) diseases caused by Ganoderma boninense. The research aimed to analyze the microsatellite markers of oil palm tolerance to G. boninense. The plant material used in this observation was two cross-series of genetic material belonging to PT Socfin Indonesia. The materials have been known as the level of resistance to Ganoderma, the first is cross-series of 15-year-old oil palm in the field, and the second is a new cross-series for early detection in the nursery stage. The quality and quantity test showed that DNA was successfully isolated and can then be used for DNA amplification. The seven primers with DNA banding patterns clearly detected visible in one band. The target genes associated with resistance to SBR disease are found in almost all individual oil palm plants. Furthermore, the low PIC (Polymorphic Informative Content) value of the seven primers except for the Rgen_Pto primer showing the high PIC in the leaf tissue and mature plant roots, suggested the potential molecular marker of this primer for selection of tolerant palm against G. boninense.
Clarification of Elaeis guineensis from NCBI databases
Authors: Hayati R , Basyuni M
Published: July 2019

Oil palm is the essential oil-producing of the plant in the world. Two species genus in oil palm wereElaeis oleíferaandElaeis guineensisJacq. The National Center of Biology Information (NCBI) contain databases of biology, related information aboutE. Guineensis, E. Oleiferaand many other plant species. Identification of genes, DNA, proteins, active compounds and important taxonomies updated central server for researchers in the world. There are five numbers that have been a file in the source literature, included Bookshelf, Mesh, NLM Catalog, PubMed and PubMed Central literature. It found four books and reports and one Medical Subject Headings (MeSH), one NLM catalog reported, 346 PubMed and 1035 full-text journal articles aboutE. guineensishave been published. Furthermore, three assemblies, 43 BioProject, and 507 BioSample also available. Only exist one genome sequencing available in oil palm with 250.064 total DNA and RNA sequenceE.guineensis.The NCBI collected 41.353 EST and 30.746 genes. There is also 51.353 groups of protein, and 30.746 sequences of protein have been reported.
The bioinformatics method of protein dehydration induced drought stress in Hevea brasiliensis Muell. Arg
Authors: Pasaribu SA , Basyuni M , Hayati R
Published: July 2019

Hevea brasiliensis Muell. Arg. (rubber plant) is one of the most significant sources natural rubber in the world. Planting material used is vegetative propagation that called a clone. Each rubber clone has specific adaptability. Adaptation of rubber in drought area is a complex trait. The current study assesses of the bioinformatics on the NCBI database as well as expected the physicochemical of protein dehydration. Several parameters of physicochemical protein dehydration in H. brasiliensis were varied among the genes observed. There is twenty (20) protein dehydration induced from H. brasiliensis deposited in NCBI. The length of the genes was alternated with the genes ascertained. Several lines of coded amino acids were 370 to 1490 bp. The mitochondria target peptide value diversified from 0.020 to 0.342, signifying that it is expected to be a presence. The present resulted indicated the prominence of the variation and role of a physical and chemical characteristic of the distinct amino acids in protein dehydration genes as drought stress in rubber.
The effect of Plesiochrysa ramburi (Schneider) (Neuroptera: Chrysopidae) to the resilience of papaya invested by Paracoccus marginatus
Authors: Pramayudi Nur , Bakti Darma , Tobing Maryani Cyccu , Husni
Published: July 2019

Paracoccus marginatus is one of the important pestson papaya. This study was conducted to evaluate the presence of one of the Chrysopa predators, Plesiochrysa ramburi to papaya invested by P. marginatus. The study used the non-factorial design with the factor of the number of predators (1, 3, 5, 7), which was released to oneovisac of P. marginatus. All treatments in the experiment had five replications. Descriptively, this study showed that the presence of Pl. ramburi, positively, affected the resilience of the plant, in this case through the mechanism of population control of P. marginatus. The presence of predators, negatively, affected P. marginatus eating behavior, which was reduced food intake behavior, which was influenced by feeding behavior. Thus it could increase plant resilience. If the presence of predators negatively affected pest eating behavior, the presence of predators could positively influence plant resilience.
The Application of Municipal Waste Compost to Improve the Physical Properties of Soil and Palm Oil Production in Silinda District, Serdang Bedagai
Authors: Simaremare Parlindungan , Rauf Abdul , Hanum Hamidah
Published: July 2019

This research had been done in Agricultural faculty of north Sumatera university, medan on april until oktober 2009. The aim of this research are studied The Application of Municipal Waste Compost to Improve the Physical Properties of Soil and Palm Oil Production in Silinda District, Serdang Bedagai. This research was designed by 2 factors and 4 replications. The first factor are uses a separate plot design (RPT) with 2 factors and 4 replications as follows: Main plot consists of 2 levels of treatment, namely:T1: 5 years of planting, T2: 20 years of planting. Child Plots consist of 3 levels of treatment, namely: K1: Without Conservation Measures + Without Giving Compost, K2: Concave Plate + Compost, K3:, Individual Rorak + Compost, and numbers of reports: 4 replications (each planting). This result showed that the application of Municipal Waste Compost not significant to the Physical Properties such as,bulkdensity,porosity, permeability.
Physical Quality of Longissimus Muscles of Kacang Goat After Supplemented With a Combination of Palm Kernel Meal and Powdered Katuk Leaf
Authors: Razali  , Ferasyi Teuku Reza , Azhari  , Rastina  , Sabri Mustafa , Abrar Mahdi , Amiruddin  , Anwar  , Hutasoit Rijanto , Tarigan Andi
Published: July 2019

The purpose of this research was to analyzed the effect of supplementation with palm kernel meal (BIS), katuk leaf powder (KAT), and both of those combined to the physical quality of Longissimus dorsi (L. dorsi) muscle in Kacang goat. Twenty male Kacang goat were used in this research; which were aged of ±1.5 years and weight of 15,42 ± 1.28 kg live body weight (BW). Complete randomized design was used in this research; with 4 treatments and 5 replications. All goats were acclimatized for 2 weeks. Group P0 as control was given distilled water. Group P1 was given BIS at dose of 100 gr/day/head. Then, Group P2 was administered BIS at dose of 100gr/day/head combined with powdered katuk leaf at dose of 15 gr/day/head, and Group P3 was given KAT 15gr/day/head, each goat was received treatments twice per day (at morning and afternoon) for 35 consecutive days. All animals were fed with leaves and grasses, and had access to water ad libitum. At the 25th and 50th day after treatment, goats from each group were slaughtered according to standard commercial halal guidelines. Meat samples derived from L. dorsi muscles were taken and to be tested for physical quality of pH, shear force, water holding capacity, cooking loss, meat and fat color. Data were analyzed by using analysis of variance. The administration of KAT tended to lower (P > 0,05) the shear force value of the L. dorsi muscle as compared to control group. In conclusion, the administration of powdered katuk leaves is appropriate to improve the physical quality of L. dorsi muscles in local Kacang Goat.
Antibacterial Ability of Endophytic Bacteria Isolated from Kemenyan (Styrax benzoin L.)
Authors: Siregar R V , Suryanto D , Yurnaliza
Published: July 2019

Kemenyan is one of plant commodities in North Sumatera that has been used as medicinal plants to treat infection and illness. The aim of this study was to isolate endophytic bacteria from kemenyan (Styrax benzoin) and evaluate their antibacterial properties against pathogenic bacteria. Sixteen isolates were found from leaf, bark and root samples of kemenyan. Two isolates, RS01 and RS13 showed considerable antibacterial activities against Staphyloccocus aureus, Escherichia coli and Streptococcus mutans.
Decolorization of Azo Synthetic Textile Dye by Halotolerant Bacteria And Identification Used By 16S rRNA
Authors: Hutagalung D. E , Hannum S , Priyani N
Published: July 2019

Textile dye has been used in textile industry to produce carpet, batik, cosmetics as well as pharmaceutical products. Utilizing of textile dye especially azo dye in textile industries is more efficient than natural dye. The high production of textile increases liquid wastes. If the liquid waste is not treated properly and discharged directly to environment, it causes pollution that could harm both organism and the environment itself. Azo textile dye is difficult to be degraded in the naturally environment. The aim of this research is to study the potency of halotolerant bacteria to decolorize azo textile dye. The isolates were isolated from the sea around of Mursala Island, Tapian Nauli village, Central Tapanuli district. In this research, the highest percentage of decolorization was shown by 2 isolates, DH2 and DH3. The quantitative decolorization test was performed in MSM liquid media which were amended by three different pH variations: 6, 7 and 8; Three different azo concentrations which were: 600, 800 dan 1000 ppm and three different salinity of media which were: 0 %, 5%, and 10%. The optimum conditions for isolate to degrade azo dye were shown by isolate DH2 at pH 6, salinity 5% and azo concentration of 600 ppm which was 49.64%. Based on 16S rRNA gene, it was known that DH2 was identified to close to Stenotrophomonas pavanii strain LMG 25348 with homology of 97%.
Identification of Blast Resistance Genes in Fifteen Rice Accessions (Oryza sativa L.) from North Sumatera
Authors: Hannum Saleha , Hasibuan Ummu Kulsum , Sinaga Riyanto , Wahyuningsih Hesti
Published: July 2019

One challenge in improving rice productivity is the occurrence of blast disease caused byPyricularia grisea. Development of current disease is affected by several factors, one of which is an expression of resistance gene towards blast by rice systemic defense. In order to construct blast-resistant variety, research has been conducted to identify resistance-controlling gene against blast in fifteen rice accessions native to North Sumatera. Identification of blast resistance gene performed using PCR amplification of rice genome with six specific primers:Pi-d2, Pupl, Pi-ta2, Pi-37, Pi-z, andPib.The results showed that genes,Pi-d2, Pi-z, andPibwere present on fifteen rice accessions, genePup1positively located in fourteen accessions (93%),Pi-ta2in thirteen accessions (87%), andPi-37in seven accessions (47%). Rice accessions with six blast resistance genes detected were:Ampari 3, Bagendi 1, Bagendi 3, Martabe 3, Siporang 2, andSilatian 2.The least number of genes were detected from two accesions namely:Ampari 2andSirara 2, with only four resistance genes.
Effect of Turmeric Rhizome Extract (Curcuma longa L.) on Kidney Histology of Preeclampsia Rats (Rattus norvegicus L.)
Authors: Ilyas S , Hutahaean S , Elimasni  , Panjaitan S R N
Published: July 2019

Preeclampsia (PE) is second death in pregnancy in Indonesia. This study aims to determine the effect of turmeric extract (Curcuma longa L.) on renal necrosis, narrowing of the proximal tubulus, renal weight and changed of renal color of rats. This study used a type of analytic study with an experimental quasi design in pregnant female rats (Rattus norvegicus) consisting of four treatments with six replications each. The study consisted of a negative control group (K-) with only feed given ad libitum, positive control (K +) in injection of LPS intervena with a dose of 0.2 / kgBW, and 2 group giving turmeric extract (Curcuma longa L.) with doses of 400 mg / kgBW (P1) and 600 mg / kgBW (P2). Rats (Rattus norvegicus) are disectedto take the kidneys. Kidneys are made into a preservative preparation with the paraffin method and staining Hematoxylin-Eosin (HE). The results of renal morphology observations showed a change in color in the treatment group P2. The histological features of the kidneys in the proximal tubulus showed a decrease in P1 compared to the P2 group and the percentage of renal necrosis in P2 had a significant change compared to the positive control group (K+).Extract of Turmericrhizome (Curcuma longa L.) is proven to be able to maintain and improve the structure of cells of the kidneys in the Rats preeclampsia model.