scholarly journals Desorption Characterization of Methane in Coal with Different Moisture Contents and Its Influence on Outburst Prediction

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Peng Li ◽  
Yaolin Cao ◽  
Xuelong Li ◽  
Fakai Wang ◽  
Zhongguang Sun ◽  
...  
Keyword(s):  
Moisture Content ◽  
Time Interval ◽  
Pressure Data ◽  
Time Data ◽  
Initial Amount ◽  
Gas Desorption ◽  
Present Test ◽  
Short Period ◽  
Velocity Diffusion

Coal and gas outburst is a dynamic phenomenon with violent eruptions of coal and gas from the working coal seam. It has been proved that rapid desorption within a short period is necessary for the occurrence of an outburst. Due to the limitation of the present test condition, gas desorption characterization in coal with different moisture content for the first several seconds (0–60 s) has not been researched sufficiently. In this study, initial desorption characterization of gas in coal with different moisture content is studied by experiments with methane. The most remarkable characteristic of the experimental setup is the application of a self-developed real-time data acquisition system with a time interval of about 10 ms, which achieves the goal of collecting enough pressure data for analysis and calculation. The data is used to study gas pressure variation and calculate the initial amount of desorbed gas and index (ΔP) of initial velocity diffusion of coal gas. From the experimental results, the new proof has been found to verify that coal with lower moisture content and methane outburst is more dangerous than coal with higher moisture content and outburst. The degree of coal and methane outburst is exponentially decaying with increasing moisture content.

scholarly journals Desorption characterization of methane and carbon dioxide in coal and its influence on outburst prediction

2018 ◽  
Vol 36 (7-8) ◽  
pp. 1484-1495 ◽  
Author(s):  
Yunpei Liang ◽  
Fakai Wang ◽  
Yongjiang Luo ◽  
Qianting Hu
Keyword(s):  
Carbon Dioxide ◽  
High Frequency ◽  
Gas Pressure ◽  
Initial Time ◽  
Desorption Process ◽  
Gas Desorption ◽  
Desorption Time ◽  
Short Period ◽  
Experimental Apparatus

Coal and gas outburst is a dynamic phenomenon with violent eruptions of coal and gas from the working coal seam. It has been proved that the rapid desorption within a short period is necessary for the occurrence of an outburst. Due to limitation of the present test condition, gas desorption characterization for the first 60 s has not been researched sufficiently. In the present study, an experimental apparatus with the ability of high-frequency data collection was developed. Initial desorption characterization of methane and carbon dioxide in coal was experimentally studied. Both the initial desorption characterization of methane and carbon dioxide were experimentally studied with different equilibrium pressures. The desorbed gas pressure was measured at desorption time phase of 0–10 and 45–60 s, besides the initial amount of desorbed gas and initial diffusion velocity of coal gas were calculated to assess their risk of outburst. The results show that the gas pressure for both methane and carbon dioxide increases sharply in the initial time and then levels off, and the total amount of desorbed gas increases with the increasing desorption time. Although the amount of desorption methane is slightly larger than that of carbon dioxide at the beginning, the total amount of desorbed carbon dioxide is significantly larger than that of methane at the desorption process. Therefore, it can be concluded that the coal and carbon dioxide outburst is more dangerous than the coal and methane outburst based on the obtained experimental results.

scholarly journals An LSTM-Based Method Considering History and Real-Time Data for Passenger Flow Prediction

2020 ◽  
Vol 10 (11) ◽  
pp. 3788 ◽  
Author(s):  
Qi Ouyang ◽  
Yongbo Lv ◽  
Jihui Ma ◽  
Jing Li
Keyword(s):  
Feature Extraction ◽  
Real Time ◽  
Short Term Memory ◽  
Historical Data ◽  
Time Interval ◽  
Information Coding ◽  
Time Data ◽  
Passenger Flow ◽  
Flow Prediction ◽  
Real Time Data

With the development of big data and deep learning, bus passenger flow prediction considering real-time data becomes possible. Real-time traffic flow prediction helps to grasp real-time passenger flow dynamics, provide early warning for a sudden passenger flow and data support for real-time bus plan changes, and improve the stability of urban transportation systems. To solve the problem of passenger flow prediction considering real-time data, this paper proposes a novel passenger flow prediction network model based on long short-term memory (LSTM) networks. The model includes four parts: feature extraction based on Xgboost model, information coding based on historical data, information coding based on real-time data, and decoding based on a multi-layer neural network. In the feature extraction part, the data dimension is increased by fusing bus data and points of interest to improve the number of parameters and model accuracy. In the historical information coding part, we use the date as the index in the LSTM structure to encode historical data and provide relevant information for prediction; in the real-time data coding part, the daily half-hour time interval is used as the index to encode real-time data and provide real-time prediction information; in the decoding part, the passenger flow data for the next two 30 min interval outputs by decoding all the information. To our best knowledge, it is the first time to real-time information has been taken into consideration in passenger flow prediction based on LSTM. The proposed model can achieve better accuracy compared to the LSTM and other baseline methods.

Characterization of the Low-Salinity Stress in Vibrio vulnificus

2008 ◽  
Vol 71 (2) ◽  
pp. 416-419 ◽  
Author(s):  
HIN-CHUNG WONG ◽  
SHU-HUI LIU
Keyword(s):  
Salinity Stress ◽  
Food Processing ◽  
Vibrio Vulnificus ◽  
Exponential Phase ◽  
Salinity Adaptation ◽  
Significant Protection ◽  
Low Salinity ◽  
Short Period ◽  
Nonculturable State

Vibrio vulnificus is a marine pathogenic bacterium commonly found in seawater or seafood. This organism encounters low-salinity stress in its natural environment and during food processing. This study was designed to investigate the response of V. vulnificus YJ03 to lethal low salinity (0.04% NaCl) and its adaptation to sublethal salinity (0.12% NaCl with 20 amino acids added). A short period in the nonculturable state was induced by lethal low-salinity stress followed by cell death after 30 min of stress. Addition of 1 mM glycine betaine or 0.5 mM sucrose reduced the damage. Low-salinity adaptation was achieved in the exponential-phase cells but not in the stationary-phase cells. Significant protection against lethal low-salinity stress was attained when the cells were adapted for as little as 1.5 min. The adapted cells were significantly protected against lethal low salinity and 2.4% sodium sorbate but sensitized to the challenge of heat (52°C) and acid (pH 3.2). Nonlethal lowsalinity treatment of seafood should be avoided to prevent stress adaptation of V. vulnificus.

Purification and characterization of two isoforms of native α amylase from Ok-Rong mango (Mangifera indica Linn. cv. Ok-Rong)

2017 ◽  
Vol 42 (6) ◽  
Author(s):  
Raksmont Ubonbal ◽  
Saijai Porsoongnoen ◽  
Jureerut Daduang ◽  
Sompong Klaynongsruang ◽  
Sakda Daduang
Keyword(s):  
High Temperatures ◽  
Fruit Ripening ◽  
Specific Activity ◽  
Mangifera Indica ◽  
Ripening Stage ◽  
Purification And Characterization ◽  
Tropical Plant ◽  
Short Period ◽  
Structure Properties

AbstractIntroduction:The tropical plant amylases involved in the fruit ripening stage is outstanding for their high activities in converting starch to sugars within a short period at high temperatures over 40°C.Methods:The α amylase iso-enzymes from Ok-Rong mango (Results:The enzyme was purified 105-fold with a final specific activity of 59.27 U mgConclusion:Two α amylase iso-enzymes were classified as members of the low-pI group of amylases with identical structure, properties and functions. They are mesophilic with high possibilities for application for many purposes.

scholarly journals TRENDS IN DATA WAREHOUSING TECHNIQUES

2021 ◽  
Author(s):  
Naveen Kunnathuvalappil Hariharan
Keyword(s):  
Relational Databases ◽  
Financial Data ◽  
Relational Model ◽  
Time Data ◽  
Short Period ◽  
The Subject ◽  
Processing And Storage ◽  
And Storage ◽  
Long Term Trend

Financial data volumes are increasing, and this appears to be a long-term trend, implying that data managementdevelopment will be crucial over the next few decades. Because financial data is sometimes real-time data, itis constantly generated, resulting in a massive amount of financial data produced in a short period of time.The volume, diversity, and velocity of Big Financial Data are highlighting the significant limitations oftraditional Data Warehouses (DWs). Their rigid relational model, high scalability costs, and sometimesinefficient performance pave the way for new methods and technologies. The majority of the technologiesused in background processing and storage research were previously the subject of research in their earlystages. The Apache Foundation and Google are the two most important initiatives. For dealing with largefinancial data, three techniques outperform relational databases and traditional ETL processing: NoSQL andNewSQL storage, and MapReduce processing.

scholarly journals Shear Strength Characterization of Bauxite Deposits in Kuantan, East Coast Malaysia

2019 ◽  
Vol 8 (3S3) ◽  
pp. 404-407
Keyword(s):  
Shear Strength ◽  
Moisture Content ◽  
East Coast ◽  
Field Performance ◽  
Friction Angle ◽  
Parent Rock ◽  
Index Tests ◽  
Strength Characterization ◽  
The Relationship

Engineering characterization which are useful for "temperate" zone soils usually fail to predict the field performance of bauxitic soils, because the index tests upon which the characterization are based are not always reproducible for bauxitic soils. Fifteen (15) bauxitic soil of undisturbed and disturbed samples from 3 distinct sites in Kuantan, all derived from basalt parent rock but representing various stages of weathering were subjected to engineering and mineralogic tests. Values for cohesion and friction angles are evaluated. Soils from Semambu has the highest moisture content of 33.27%, the cohesion value is however lower compared to Bukit Goh which has moisture content of 21.74%. Study are further done to discover the relationship with cohesion and friction angles. Thus, by measuring the cohesion and friction angle can evaluate the performance of bauxite shear strength.

scholarly journals STRATEGI KOLABORASI DALAM SENI PERTUNJUKAN TRADISIONAL DI KABUPATEN SUBANG

2013 ◽  
Vol 5 (2) ◽  
pp. 294
Author(s):  
Irvan Setiawan
Keyword(s):  
Analytical Method ◽  
Performing Arts ◽  
Time Data ◽  
Time And Space ◽  
Secondary Sources ◽  
The People ◽  
Traditional Arts ◽  
Performing Art ◽  
Over Time

Abstrak Kesenian tradisional memegang peranan dalam pencirian dan menjadi kekhasan suatu daerah. Bagi wilayah administratif yang menjadi cikal bakal suatu kesenian daerah tentu saja tidak sulit untuk menyebut istilah kesenian khas dan menjadi milik daerah tersebut. Lain halnya dengan wilayah administratif yang tidak memiliki kesenian daerah sehingga akan berusaha menciptakan sebuah kesenian untuk dijadikan sebagai kesenian khas bagi daerahnya. Beruntunglah bagi Kabupaten Subang yang menjadi cikal bakal beberapa kesenian yang terlahir dan besar di daerahnya. Tidak hanya sampai disitu, Pelestarian dan pengembangan kesenian tradisional tampak serius dilakukan. Hal tersebut terlihat dari papan nama berbagai kesenian (tradisional) di beberapa ruas jalan dalam wilayah Kabupaten Subang. Seiring berjalannya waktu tampak jelas terlihat adanya perubahan dalam pernak pernik atau tahapan pertunjukan pada beberapa seni pertunjukan tradisional. Kondisi tersebut pada akhirnya mengundang keingintahuan mengenai strategi kolaborasi apa yang membuat seni pertunjukan tradisional masih tetap diminati masyarakat Subang. Penelitian ini dilakukan dengan menggunakan metode deskriptif analisis yang didukung dengan data lintas waktu baik dari sumber sekunder maupun dari pernyataan informan mengenai seni pertunjukan tradisional di Kabupaten Subang. Dari hasil penelitian diperoleh bahwa kolaborasi yang dilakukan meliputi kolaborasi lintas waktu dan lintas ruang yang masih dibatasi oleh seperangkat aturan agar kolaborasi tidak melenceng dari identitas ketradisionalannya.AbstractTraditional arts play a role in the characterization of a region. The Regency of Subang became the pioneer for inventing and creating some traditional arts. They were born and grew in the area, and their preservation and development are seriously taken into consideration. It is evident that some changes occurred over time, for example in the accessories or phase of performances at several traditional performing arts. ThisNaskah Diterima: 28 Februari 2013Naskah Disetujui: 2 April 2013condition makes the author curious about the strategy of collaboration that makes the people of Subang interested in traditional performing art. The author conducted descriptive analytical method supported by cross-time data either from primary or secondary sources. The result shows that the strategy of collaboration across time and space in traditional performing

scholarly journals Characterization of rocky exoplanets from their infrared phase curve

2010 ◽  
Vol 6 (S276) ◽  
pp. 485-486
Author(s):  
Anne-Sophie Maurin ◽  
Franck Selsis ◽  
Franck Hersant ◽  
Marco Delbò
Keyword(s):  
Thermal Emission ◽  
Infrared Emission ◽  
Phase Curve ◽  
Low Mass Stars ◽  
Rotation Surface ◽  
Key Population ◽  
Short Period ◽  
Low Mass ◽  
Observation Geometry

AbstractDuring the last few years, observations have yielded an abundant population of short-period planets under 15 Earth masses. Among those, hot terrestrial exoplanets represent a key population to study the survival of dense atmospheres close to their parent star. Thermal emission from exoplanets orbiting low-mass stars will be observable with the next generation of infrared telescopes, in particular the JWST. In order to constrain planetary and atmospheric properties, we have developed models to simulate the variation of the infrared emission along the path of the orbit (IR phase curve) for both airless planets and planets with dense atmospheres. Here, we focus on airless planets and present preliminary results on the influence of orbital elements, planet rotation, surface properties and observation geometry. Then, using simulated noisy phase curves, we test the retrieval of planets' properties and identify the degeneracies.

Characterization of short-period ZnTe-ZnS superlattices grown by MBE

1990 ◽  
Vol 99 (1-4) ◽  
pp. 464-467 ◽  
Author(s):  
Takeshi Karasawa ◽  
Kazuhiro Ohkawa ◽  
Tsuneo Mitsuyu
Keyword(s):  
Short Period
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