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  1. Article ; Online: Factors influencing surface water and groundwater interaction in alluvial fan

    Fanao Meng / Changlai Xiao / Xiujuan Liang / Ge Wang / Ying Sun / Dongxin Guo

    Journal of Water and Climate Change, Vol 12, Iss 3, Pp 679-

    2021  Volume 695

    Abstract: In this study, the surface water balance method was used to calculate the interaction between surface water and groundwater (SGW) in the Taoer River alluvial fan in Jilin Province, China, from 1956 to 2014. The automatic linear model was used to ... ...

    Abstract In this study, the surface water balance method was used to calculate the interaction between surface water and groundwater (SGW) in the Taoer River alluvial fan in Jilin Province, China, from 1956 to 2014. The automatic linear model was used to determine the key and non-key influencing factors, and correlation analysis was performed to evaluate their relationship with one another. River runoff and groundwater level were the key factors affecting the SGW interaction, and sand–gravel exposure in the fan was more conducive to SGW interaction. There was a positive correlation between runoff and SGW interaction, and the relationship between the groundwater and surface water levels was correlated and affected by groundwater exploitation and groundwater runoff. Groundwater exploitation and evaporation and precipitation indirectly influenced the SGW interaction by affecting the groundwater level and river runoff key factors, respectively, and were considered non-key factors. HIGHLIGHTS The annual and monthly interactions of the Taoer River alluvial fan were calculated from 1956 to 2014.; They are influencing factors of the interaction between surface water and groundwater (SGW).; The influencing factors of SGW transformation are analyzed and classified.; The stability factor affecting SGW interaction is riverbed lithology.; The key factors affecting SGW interaction are river runoff and groundwater level.;
    Keywords alluvial fan ; correlation analysis ; influencing factors ; sgw interaction ; taoer river ; Environmental technology. Sanitary engineering ; TD1-1066 ; Environmental sciences ; GE1-350
    Subject code 550 ; 333
    Language English
    Publishing date 2021-05-01T00:00:00Z
    Publisher IWA Publishing
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article ; Online: Enhancing the Output Performance of a Triboelectric Nanogenerator Based on Modified Polyimide and Sandwich-Structured Nanocomposite Film

    Jiaheng Zhou / Chunhao Lu / Danquan Lan / Yiyi Zhang / Yiquan Lin / Lingyu Wan / Wenchang Wei / Yuwang Liang / Dongxin Guo / Yansong Liu / Wenyao Yu

    Nanomaterials, Vol 13, Iss 1056, p

    2023  Volume 1056

    Abstract: Recently, scientists have been facing major obstacles in terms of improving the performances of dielectric materials for triboelectric nanogenerators. The triboelectric nanogenerator (TENG) is one of the first green energy technologies that can convert ... ...

    Abstract Recently, scientists have been facing major obstacles in terms of improving the performances of dielectric materials for triboelectric nanogenerators. The triboelectric nanogenerator (TENG) is one of the first green energy technologies that can convert random mechanical kinetic energy into electricity. The surface charge density of TENGs is a critical factor speeding up their commercialization, so it is important to explore unique methods to increase the surface charge density. The key to obtaining a high-performance TENG is the preparation of dielectric materials with good mechanical properties, thermal stability and output performance. To solve the problem of the low output performance of PI-based triboelectric nanogenerators, we modified PI films by introducing nanomaterials and designed a new type of sandwich-shaped nanocomposite film. Herein, we used polyimide (PI) with ideal mechanical properties, excellent heat resistance and flexibility as the dielectric material, prepared an A-B-A sandwich structure with PI in the outer layer and modified a copper calcium titanate/polyimide (CCTO/PI) storage layer in the middle to improve the output of a TENG electrode. The doping amount of the CCTO was tailored. The results showed that at 8 wt% CCTO content, the electrical output performance was the highest, and the open-circuit voltage of CCTO/PI was 42 V. In the TENG, the open-circuit voltage, short-circuit current and transfer charge of the prepared sandwich-structured film were increased by 607%, 629% and 672% compared to the TENG with the PI thin film, respectively. This study presents a novel strategy of optimizing dielectric materials for triboelectric nano-generators and has great potential for the future development of high output-performance TENGs.
    Keywords sandwich-structured nanocomposites ; polyimide ; triboelectric nanogenerators ; Chemistry ; QD1-999
    Subject code 621
    Language English
    Publishing date 2023-03-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article ; Online: Characteristics and Genetic Mechanisms of Normal-Pressure Fractured Shale Reservoirs

    Jinxi Wang / Xianfeng Tan / Jia Wang / Hualian Zhang / Ye Zhang / Dongxin Guo / Xiaofeng Wang / Zhian Lei / Chunlin Zeng / Guanghua Yao

    Frontiers in Earth Science, Vol

    A Case Study From the Wufeng–Longmaxi Formation in Southeastern Chongqing, China

    2021  Volume 9

    Abstract: Compared with the overpressure conditions of shale reservoirs in the Jiaoshiba area, exploring the controlling factors of changes in shale reservoir physical properties under normal-pressure accumulation is of great significance to shale gas exploration. ...

    Abstract Compared with the overpressure conditions of shale reservoirs in the Jiaoshiba area, exploring the controlling factors of changes in shale reservoir physical properties under normal-pressure accumulation is of great significance to shale gas exploration. To achieve this, X-ray powder diffraction, nitrogen adsorption, and scanning electron microscopy were carried out to determine mineral content, permeability, porosity, and pore structure for well core and outcrop samples of the Wufeng–Longmaxi Formation in southeastern Chongqing, China. Field observations and drilling cores revealed abundant structural fractures in southeastern Chongqing, offering potential main storage space for shale gas. Findings also determined that high-quality source rocks are located in the lower part of the Wufeng–Longmaxi Formation, which features low porosity and low permeability, yet existing structural fractures could potentially improve permeability to a certain extent. The main factors controlling the shale reservoir with the above characteristics include the depositional environment, mineral components, total organic carbon content, and tectonic movement. The deep-water anoxic depositional environment was conducive to the complete preservation of organic matter and sedimentation of the biogenic siliceous minerals, which had a strong effect on improving the porosity of organic matter and brittleness of the rocks. The high content of quartz was found to improve rock compression resistance and brittleness, and increasing clay proportion was found to enhance the interlayer pores of clay minerals. Total organic carbon content, specific surface area, pore volume, and fracture development were all found to have direct contributions to shale gas entrapment. Overall, the most important factor resulting in normal-pressure accumulation in southeastern Chongqing was the intense tectonic movements since the Late Jurassic period which destroyed the original overpressure accumulation conditions.
    Keywords shale reservoir ; physical characteristics ; the Wufeng formation ; the Longmaxi formation ; southeastern Chongqing ; Science ; Q
    Subject code 550
    Language English
    Publishing date 2021-05-01T00:00:00Z
    Publisher Frontiers Media S.A.
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  4. Article ; Online: Effects of 2-hydroxy-4(methylthio) butanoic acid isopropyl ester on rumen fermentation in cashmere goats

    Yali Feng / Yuyan Cong / Hongwei Deng / Dongxin Guo / Haiying Liu

    Revista Brasileira de Zootecnia, Vol 42, Iss 5, Pp 342-

    2013  Volume 346

    Abstract: The impact of dietary 2-hydroxy-4-(methylthio) butyric acid isopropyl ester (HMBi) on rumen fermentation in cashmere goats was investigated to determine the effect of this ester on cashmere production. Four healthy castrated Liaoning cashmere goats with ... ...

    Abstract The impact of dietary 2-hydroxy-4-(methylthio) butyric acid isopropyl ester (HMBi) on rumen fermentation in cashmere goats was investigated to determine the effect of this ester on cashmere production. Four healthy castrated Liaoning cashmere goats with permanent rumen cannulas were assayed for four periods. In each period, goats were fed a different diet: control diet (containing 0% MetaSmart (an HMBi product)), diet I (containing 0.85% MetaSmart), diet II (containing 1.27% MetaSmart) or diet III (containing 1.70% MetaSmart). Rumen pH, ammonia-N concentration, volatile fatty acid (VFA) concentrations and total protein concentration were determined after feeding in each period. Results showed that rumen pH significantly increased and rumen ammonia-N concentration significantly decreased when the diet was supplemented with 0.85%, 1.27% and 1.70% MetaSmart. Diets with 1.27% and 1.70% MetaSmart increased rumen total VFA concentration, and 3 hours post feeding all three HMBi diets increased acetic acid concentration. Rumen total protein concentration significantly increased in the goats fed 1.27% or 1.70% MetaSmart. Thus, diets supplemented with HMBi significantly affected rumen pH, ammonia-N concentration, VFA concentrations and total protein content. Dietary HMBi can promote rumen fermentation in cashmere goats.
    Keywords 2-hydroxy-4-(methylthio) butyric acid isopropyl ester ; rumen ammonia-N ; rumen pH ; rumen total protein ; rumen volatile fatty acids ; Animal culture ; SF1-1100 ; Agriculture ; S ; DOAJ:Animal Sciences ; DOAJ:Agriculture and Food Sciences
    Language Portuguese
    Publishing date 2013-05-01T00:00:00Z
    Publisher Sociedade Brasileira de Zootecnia
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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