bluuebunny/crossref_metadata_2025_split huggingface dataset:
The application of the improved Talbot’s inverse Laplace transformation method in solving the flow problem of porous materials
Authors: Wang Fang , Han Xueli 
Published: November 2019

Abstract
In this paper, we extend the fixed Talbot’s method to the complex-valued function in order to get the general solutions for the Biot’s consolidation in the physical domain. We derive a solution for the unsteady flow field of layered porous media with anisotropic permeability under a point fluid source. By a Laplace and two-dimensional(2D) Fourier transform, the continuity equation of the fluid can be solved, and the flow field can be expressed in an analytical form in the transformed domain. Using the boundary and interface condition, the flow field for general layered porous media can be solved in the transform domain. The actual solutions in the physical domain can be obtained by inverting the Laplace-2D Fourier transform. Numerical examples are given to demonstrate the validity of the extended fixed Talbot’s inverse Laplace transformation method, and its application in solving dymanic problems of porous materials.
A Review of the Development and Applications of Number Theory
Authors: Yan Keyu 
Published: November 2019

Abstract
This paper mainly studies the development and applications of number theory, aiming to review the history of this discipline, and explore its influence on production and our life and its applications. Number theory is devoted originally to the study of the integers. With the contributions made by mathematicians in different ages to advancing the study of the integers, the basic system of number theory has been gradually improved, and thereby a complete and unified discipline has been formed. As a basic discipline, number theory spreads profound impacts on other disciplines, and is the foundation of many disciplines.
A (n +1)-dimensional KP Equation with Variable Coefficients with Self-consistent Source
Authors: Wen Danhua , chen Li , Zhang Xiaofei 
Published: November 2019

Abstract
In this paper, the variable coefficient (n+1)-dimensional KP equation is studied with the Hirota bilinear method. Firstly, the logarithmic transformation is used to transform the nonlinear variable coefficient (n+1)-dimensional KP equation into a bilinear form, and then variable coefficient (n+1)-dimensional KP equation with self-consistent source was constructed with the source generation procedure.
Noise calculation of noncompact bodies with impedance boundary in limited enclosed space
Authors: Wang Fang , Zheng Wensi 
Published: November 2019

Abstract
The present paper mainly investigates noise propagation in limited enclosed space with non-compact bodies. In view of the scattering effect induced by solid boundaries, tailored green’s function methods are used to study the noise propagation. Frequency-domain integral equation is presented to calculate scattered noise under impedance boundary condition in enclosed space. At first, the scattered noise of circular cylinder with solid boundary condition is calculated to verify the validity of the present algorithm. Secondly, the impedance boundary condition is executed on the cylinder wall. Furthermore, the impedance boundary conditions are carried out on the boundaries of enclosed space. Numerical results demonstrate that the total noise drastically reduces in some areas with impedance boundary, but increases in other areas. The phenomenon is related with the cylinder radius, the location of sound sources and the scattering effect. In practical engineering problems, the impedance boundary should be applied locally according to the configuration.
A General Analysis Method for Data Link Log Files
Authors: Xu Zhengqin , Chen Juan , Peng Laixian , Zhao Wendong , Chu Xiaojing 
Published: November 2019

Abstract
Aiming at the problem that the data analysis software of data link experiment has strong dependence on the log data format and the analysis function is difficult to expand dynamically, this paper puts forward the design idea of the log file general parsing software and the general description language of the log file of the bit-oriented data link system, and designs and implements the log file data analysis system of the general data link system.The file format description language is used to separate the analysis software from the specific data format. The log file data of various formats can be imported into Excel software on demand. By using the powerful data analysis function of Excel software, the business departments can achieve targeted data analysis.
The Optimization of Food Distribution Path of Cold Chain in the Beijing-Zhangjiakou Olympic Winter Game
Authors: Yu Fei 
Published: November 2019

Abstract
In this paper, we take the winter Olympic Games held in Beijing in 2022 as the research background, mainly in the Olympic Games held during the cold chain food distribution path scheduling optimization problem. The Beijing Olympic Games in 2022 is the first time in the history of China to host the Winter Olympics, and in Beijing, Zhangjiakou two cities together, Beijing will soon become the history of the Olympic Games held the first summer Olympic Games and the Winter Olympic Games city. Therefore, during the Olympic Games held its research on the food supply problems of athletes, but also the issue of cold chain food distribution has become the focus of the study.
Based on the model of vehicle routing problem with time window, we construct a cold chain food distribution model with the aim of minimizing the total cost of distribution. At the same time, in order to respond to the call of green Olympics and green supply chain, we consider energy saving and emission reduction. In the cost calculation, the environmental cost of carbon emission is added. Secondly, the routing of the distribution is optimized by the saving algorithm, and the distribution route is improved by the actual example given. The detailed distribution scheme is given Finally, according to the optimization results, some suggestions are put forward for the cold chain food distribution in the winter Olympic Games.
The Transport Direction and Variation Process of Water Temperature Heat at Surface
Authors: Yang Dongfang , Li Ye , Fan Bailing , Su Chunhua , Zhu Sixi 
Published: November 2019

Abstract
According to the water temperature of Jiaozhou Bay in May, August and October of 1979, based on its horizontal and vertical variation, and the difference between water temperature at surface and bottom, the impact of the transport amount and time of water temperature heat on its variation at surface and bottom and regional variation was studied. The results showed that in May, from northeastern to northern nearshore waters, water temperature reached high as 15.30-16.50 °C, which began to rise from inside waters to bay mouth, and to outside waters. In August, from eastern to northern nearshore waters, it reached high as 28.09-28.70 °C, which began to rise in same order. In October, in eastern nearshore waters, it was as high as 18.39°C, which began to increase from outside waters to bay mouth, and to inside waters. Regionally, from inside waters to bay mouth and outside waters, the minus of water temperature at surface and bottom showed that when it was transported to Jiaozhou Bay, it first reached the surface, then rapidly and constantly to sea floor, showing the variation of water temperature at surface and bottom. Spatially, water temperature at surface caused low heat and slow increase along with the horizontal and vertical gradients in May, high heat and rapid increase in August and heat and increase in October. Besides, the homogeneous layer was formed in outside waters vertically from surface and bottom. In bay mouth, water temperature at bottom was slightly higher than that at surface, whereas, in inside waters, it was opposite. Therefore, the temporal and spatial variation displayed the variation of water temperature at surface along with horizontal and vertical gradients. In addition, the modelling diagram was proposed and the transport direction and variation process of water temperature heat at surface were clarified.
Application of Hilbert-Huang Transform in Ultrasonic Echo Signal Processing of Composites
Authors: Gao Chengqiang , Chen Guiming , Shi Xiaomei 
Published: November 2019

Abstract
The ultrasonic nondestructive testing signals of carbon fiber reinforced composites have the characteristics of non-stationary and low signal-to-noise ratio, and Hilbert-Huang transform has unique advantages in feature extraction of such signals. This paper introduces the basic idea and method of Hilbert-Huang transform, which decomposes ultrasonic echo signals into several intrinsic mode functions, highlights the local characteristics of signals, and then obtains Hilbert spectrogram, marginal spectrum and instantaneous energy spectrum, so as to reveal the process of simultaneous changes of signal energy in time domain and frequency domain.
Research on Stability Analysis of Bonded Flexible Submarine Pipeline
Authors: Ni Lingying , Sun Chuan , Zhen Qiang 
Published: November 2019

Abstract
As an important part of underwater oil and gas transportation system, the in-situ stability of submarine pipelines is particularly important. Comparing with steel pipe, flexible pipe has the advantages of high strength, corrosion resistance, light weight, coil supply and laying. In this paper, the finite element software ABAQUS is used to calculate the initial in-situ stress balance of soil, pipe weight, internal pressure load analysis and horizontal buckling simulation. The transverse horizontal displacement and stress distribution under high temperature and high pressure in flexible pipeline operation are calculated. The results show that the temperature difference and pressure difference in pipeline operation are the main causes of pipeline failure. The results show that the relevant parameters of seabed soil have different effects on pipeline failure, and the friction coefficient of soil and pipeline is more obvious.
Research on Dynamic Characteristics of Rigid-Flexible Coupling System
Authors: Li Li , Lixin Wei , Mingmin Liu , Jiazhao Li 
Published: November 2019

Abstract
In order to study the influence of a flexible component on the vibration of a rigid-flexible coupling system under a shooting condition, the finite element theory is used to calculate the modal of the flexible component and establish its rigid region. The dynamic theory is used to establish the system. The virtual prototype is coupled to the virtual prototype, and the virtual prototype is calculated. The vibration displacement of the system under different working conditions is analyzed and discussed. The simulation results show that the flexible component has an influence on the lateral and longitudinal vibration displacement at the muzzle under shooting conditions. The research on the muzzle vibration provides a theoretical basis of the aircraft gun firing accuracy and the overall design of the aircraft.
Performance analysis of a brake magnet
Authors: Ren Facai , Wu Xinghua , Tang Xiaoying 
Published: November 2019

Abstract
The performance of elevator brake is very important for the safe operation of elevator. In this study, the performance of a brake magnet used in a elevator was analyzed. The outer wall of engine base and the plunger were analyzed by the optical microscope, scanning electron microscope, energy dispersive spectrometer and microhardness analysis.
Preliminary study: Padina australis Hauck’s antibacterial activity and phytochemical test against pathogenic shrimp bacteria
Authors: Latifah L A , Soekamto N H , Tahir A 
Published: November 2019

Abstract
The potential of aquaculture organism, Shrimp, need extra watchfulness to prevent it against the pathogenic bacteria attack. The use of synthetic antibiotics in shrimp can make pathogenic bacteria resistant and pollute the environment. Lately, Marine Natural Products (MNP) are other ways to overcome this problem. In this study, the MNP were extracted from macroalga Padina australis Hauck. The study aimed to examine the antibacterial activity of n-hexane, ethyl acetate, acetone, and ethanol crude extract against three pathogenic shrimp bacteria (Vibrio harveyi, Vibrio parahaemolyticus, and Aeromonas hydrophilla) and phytochemical screening, respectively. Ethyl acetate crude extracts of Padina australis Hauck showed that it could act as an antibacterial agent against Vibrio harveyi (1,76 mm), Vibrio parahaemolyticus (2,3 mm) and Aeromonas hydrophilla (4,43 mm). The phytochemical tests revealed that P. australis Hauck contains a steroid, terpenoid, phenolic, tannin, and alkaloid compounds.
Bioactivity of methanolic extract of marine tunicate Pyura sp against methicillin resistant Staphylococcus aureus (MRSA)
Authors: Litaay M , Johannes E , Dwyana Z , Husain K , Sardiani N 
Published: November 2019

Abstract
The research on potential methanol extract from marine tunicate Pyura sp as antibacterial Methicillin-Resistant Staphylococcus aureus (MRSA) has been done from February to April 2017. This research was intended to know the potential of methanol tunicates extract of proposed tunicates as an antibacterial MRSA. Tunicates were collected from Barrang Lompo waters of Sangkarang Archipelago of South Sulawesi Indonesia. Samples were dried, then the active compound was extracted used methanol solvent according to a standard procedure elsewhere. Tunicate’s extract was prepared into three different concentrations: 10%, 15%, and 20%, were tested against MRSA bacteria. A test of inhibition zone was applied at 24 h and 48 h incubation time in order to determine the bioactivity of tunicate’s extract towards MRSA. The result indicates that crude extracts of tunicates P. Pyura sp at all concentration performs anti bacteria activity against MRSA. This study concluded that tunicate Pyura sp has bactericidal activity against MRSA and this can lead to developing a new antibiotic in the future.
Compatibility of MO PLUS biofertilizer and Paenybacillus polymyxa to stimulate rice germination
Authors: Baharuddin  , Jahuddin R , Yani A , Tuwo M 
Published: November 2019

Abstract
The level of productivity of rice plantations can be increased through technical improvements in culture, namely spur plant growth. Increasing the germination rate is done by using growth regulators. Plants have limited synthesizing growth hormones in support of optimal growth. Therefore, it is necessary to add additional growth hormone from outside which can be given through fertilizers and symbiosis of microorganisms, including through the help of growth-regulating bacteria. MO Plus which is a combination of biological fertilizers and microorganisms Bradyrhizobium japonicum which is forming soybean root nodules to take nitrogen directly from the air and Streptomycetes as biological control of plant diseases. Efforts to merge MO Plus with P. polymyxa isolates in a consortium of biological product formulations need to be initiated to stimulate rice germination. The research stage consisted of synergistic tests by growing P. polymyxa bacteria and microbial consortium and calculating the number of bacterial colonies 48 hours in liquid media Nutrient Broth. The ability test produced IAA using L-Triptofan as a precursor, and the ability to produce GA3. The results showed that the levels of IAA and GA3 in Mo plus were 0.095 and 2.225 µg.l−1 respectively, while P. polymyxa: 0.087 and 2.251 µg.l−1. Synergism test results show that P. polymyxa and MO Plus bacteria can be grown on the same media simultaneously with the number of colonies of 2.3.108 CFU/ml. The treatment of MO Plus + Paenybacillus has the best influence on germination, wet weight, and dry weight of rice seeds.
Gastropods and edible macroalgae
Authors: Soekendarsi E. 
Published: November 2019

Abstract
The study on gastropods on edible macroalgae was conducted at Kodingareng island on the west-side of South Sulawesi. Macroalagae of the genera Hypnea, Gelidium and Acanthophora were sampled together with their molluscan fauna. A total of 36 genera of gastropods were found on the three genera of algae. The genera Heliacus, Clypeomorus, Cerithium, Pyrene, Columbella, Mitra, and Morula were present on all three genera of algae. Cerithium and Rhinoclavis were the most common hervivores on Gelidium and Hypnea, while Littorina was the most common herbivores on Acanthophora.
The study of bacteria populations in phytoremediation of cadmium using Eichhornia crassipes
Authors: Fahruddin F , Tanjung R E 
Published: November 2019

Abstract
The method of phytoremediation using Eichhornia crassipes plants was able to overcome the problem of cadmium (Cd) heavy metal pollution. This study aims to analyze the population of bacteria in Cd phytoremediation in groundwater using E. crassipes. The treatment in the study included T1 of 3 mg/L, T2 of 7 mg/L and T3 of 9 mg/L. The parameters observed were Cd concentration, a total of bacteria numbers, change in pH and total suspended solids (TSS). Based on the results of the study, the T1 treatment was the best absorbs of Cd in groundwater when using E. crassipes was 82%. It was the highest compared to other treatments which presented T2 of 65% and T3 of 73%. The highest bacteria population in T1 treatment. For pH and TSS, all treatments on the 12th day relatively of similar. In addition, this study also produced five types of isolates based on the results of characterization, including M1, M2, M3, M4, and M5. This shows that the E. crassipes will be inhibited from absorbing Cd at high concentrations, also affecting bacteria growth.
Cocoa Clone Resistance to Phytophthora Pod Rot (PPR) and Cocoa Pod Borer (CPB) in South Sulawesi
Authors: Dewi V S , Asman  , Josua K , Tuwo M 
Published: November 2019

Abstract
This research aimed find out the resistant of some superior cocoa clones to Phytophthora palmivora in South Sulawesi. This research covers several stages ranging from selection and sampling of cocoa clones, pathogen exploration to cocoa clone’s resistant test with various methods that is attaching the cocoa pod part to the healthy cocoa pod, applying P. palmivora suspension to the cocoa surface and sticking P. Palmivora isolates to the healthy cocoa pod section. The results showed that the resistance of cocoa clones to the three inoculation methods showed different areas of spotting on each observation day. The three application methods show that different applications can affect the difference in infection rates in each cocoa pod clone so that the spots that arise from infection can occur in various ways.
Medaka fish Oryzias javanicus Bleeker as bio-indicator of lead content in waters
Authors: Andriani I , Litaay M , Sartika  , Tahir D 
Published: November 2019

Abstract
An increase of heavy metal used in various products has lead to an increase of its pollution in water column elsewhere. Previous studies have shown that member of medaka fish is widely used as bio-indicator of pollution. Various medaka fish have been used in environmental as medical studies. The present study aims to observe capability of medaka fish Oryzias javanicus Bleeker as bio-indicator of lead [Pb] content in waters. Fish was collected from the mouth river of Jeneberang South Sulawesi and acclimatized at the Medaka Study Centre of Hasanuddin University. In order to study capability as bio-indicator, the fishes as test animals was treated with different concentration that of 0; 0.01; 0.03 and 0.05 mg/L Pb. Test animals were kept in media containing Pb for ten days before assessing their metal content. Pb content in animals was calculated after treatments. Composite method was applied for Pb content in medaka fish, in which fish was crushed and proceed to metal content analysis using EDXRF spectrofotometer. The result indicates that medaka fish Oryzias javanicus Bleeker survives at threshold concentration 0.05 mg/L Pb, respectively. We conclude that Oryzias javanicus can be used as bio-indicator of lead content in waters.
Cloning and expression of recombinant protein CFP21 from Mycobacterium tuberculosis as a tuberculosis vaccine candidate
Authors: Ahmad A , Agus R , Massi M N , Handayani I , Karim H 
Published: November 2019

Abstract
Increased resistance to TB drugs, may render vaccine development a more effective approach to stop or reduce TB epidemics. The antigen Culture Filtrat Protein Filtrat 21 (CPF21) is an immudominant protein encoded in RD 2 region of the Mycobacterium tuberculosis genome, capable of obtaining a strong hypersensitivity reaction and to induce very high interferon-gamma (IFN-γ) responses in patients with tuberculosis. In order to construct the recombinant plasmid pGEM-T Easy-CFP21 and express it in E. coli BL21, the CFP21 gene was amplified from M. tuberculosis H37Rv genomic DNA using PCR in vitro, and inserted into the pGEM-T Easy cloning vector. The recombinant plasmid was then transformed into E. coli JM109, followed by plasmid extraction, PCR amplification, and DNA sequencing. The correct recombinant CFP21 gene was subcloned into expression vector pGEX-2TK and transformed into E. coli BL21 strain. The white recombinant colony was selected, cultured, induced with 50 µM IPTG, and identified using SDS-PAGE electrophoresis method. These results demonstrated that CFP21 gene has been constructed and expressed successfully. The molecular weight was about 47 kDa as the fusion protein GST-CFP21 and expressed as insoluble protein. In conclusion, the target gene CFP21 has been cloned into host E. coli BL-21 strain and expressed successfully. In the future, the purified recombinant fusion protein GST-CFP21 paves the way for TB diagnosis and vaccine development.
Anti-dengue potential of bioactive protein from exophytic bacteria that are symbiotic with brown algae Sargassum sp.
Authors: Ahmad A , Wahid I , Massi M N , Arfah R , Karim H 
Published: November 2019

Abstract
Symbiont bacteria of algae are bioactive metabolite sources with potential as medicinal raw materials. This study aims to find out the anti-dengue potential of a protein fraction isolated from Enterobacter agglomerans SB 5(1) as the symbiont of brown algae Sargassum binderi collected from Lae-Lae island, South Sulawesi. These extracellular and intracellular fractions were isolated by ammonium sulphate fractionation at saturation levels of 0-20 %, 20-40 %, 40-60 %, and 60-80 %. The protein was purified by dialysis method using cellophane bag. Toxicity was tested by BSLT method using shrimp larvae of Artemia salina, Leach. Cytotoxicity test against vero cells infected with dengue virus DEVN-2 was performed by MTT method. Study findings indicate that intracellular protein fraction from E. agglomerans SB 5(1), a symbiont of brown algae Sargassum binderi, showed the presence of bioactive protein having strong toxicity with LC50 of 48.67 µg/mL. Anti-dengue activity toward vero cells indicates inhibition percentage and CC50 value of 70% and 260.37 µg./mL, respectively, therefore it had no potential as anti-virus dengue agent. In future studies, it is recommended to perform hydrolysis of protein compound from symbiont bacteria of Sargassum sp. to explore other peptide compounds with more potential as anti-dengue agents.