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Different types and amounts of steel fibers have varying effects on the improvement of concrete's mechanical properties. In order to identify the most suitable steel fiber types for the practical production of prefabricated …
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Glass fiber, cement, aeolian sand, and water were evenly mixed and poured into a three-valve saturator mold in five layers, and each layer was scraped and compacted 20 times to make a standard cylindrical sample with the dimensions of Φ39.1 mm × 80 mm.
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Through relative dynamic elastic modulus and carbonization depth changes, the deterioration laws of the aeolian-sand powder concrete under the coupling effects of freeze-thaw + …
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1. The scope and standards of sandbox regulation are not clear. The scope and standards of sandbox regulation are not clear at present, which makes it difficult for fintech companies to determine whether they comply with sandbox regulatory requirements in practice. 2. The rules and mechanisms of sandbox regulation are not perfect.
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nectivity, and composition of oil sands more intuitively, which can provide a basis for the analysis of dilatancy mechanism and on- site targeted dilatancy and transfor-mation measures of the extraction of heavy oil. Firstly, the oil sands were analyzed by particle size analysis, as shown in Figure 1, the oil sand particle size was mainly concen-
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Fine aggregates were sieved using standard sieves with nominal diameters of 0.16 mm, 0.315 mm, 0.63 mm, 1.25 mm, 2.50 mm, and 5.00 mm, and aggregates within the particle size range of 0.16 mm to 5 mm were selected. ... Based on the mechanism sand concrete compressive strength regression equation, the effect of two interactions of SP, PEA, and ...
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The failure mechanism of biocemented sand has been largely speculated based on scanning electron microscopy (SEM) images of biocemented sand after mechanical tests.
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The primary recycled products of this enterprise comprise recycled mechanism sand, dry powder mortar, curbstones, building bricks, and gypsum boards. Additionally, it effectively recycles and regenerates metals and wood. ... However, existing standards and norms in Chongqing are relatively fragmented and lack cohesion, failing to establish a ...
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But gradually more people came. The slogan on the wall is said to be the essence of the sand dance hall. The two of us sat on the chairs, and after a while, middle-aged men kept coming over, wondering if this product was worth it. worth dancing. It is said that a song in the sand dance hall is 3 minutes and costs 15-20 yuan per song.
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This study utilized Kaizhou District, Chongqing City, a typical forest area as a case study, and used the correction method, factor method, CASA model, landscape ecology indexes, and canonical ...
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I have a broad interest and have collaborated with scholars from various disciplines. A main focus of my current research is sustainable agri-food systems under climate change.
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Herein, the interface mechanism and splitting characteristics of fiber-reinforced, cement-solidified, aeolian sand were experimentally assessed to investigate whether glass fiber exhibits better ...
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The analysis results may provide a new research approach for revealing the shear mechanism of the sand-concrete interface. Previous article in ... R = r = V S, (1) where V is the …
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Chongqing as a "big city, big rural" social structure, the development of the rural human resources increasingly ... Research Funds for the Central Universities of 2014 " Reform Policy and the Related Mechanism Research of Promoting Rural Human ... of which the standard of urban people achieved "qualified" above 91.5%, but the country was ...
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Such as chongqing section of the river sand used in ... standard requirements and the quality control of concrete. Through the analysis, may be a air-entraining admixture ... mechanism sand air content of concrete is not stable. The results is shown in figure 2.
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Founded in 1993, Chongqing Changjiang River Moulding Material Group Co., Ltd. (Hereinafter referred to as CCRMM) specializes in making resin coated sand, reclaiming used foundry sand, producing auxiliary materials for foundry industry, making sand cores for foundries, and manufacturing proppant for oil and gas industry.
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Chongqing Science and Technology Museum takes "international advanced, domestic first-class, Chongqing characteristics" as its construction goal, and carries out science education activities for the public through science and education exhibitions, scientific experiments, science and technology training and other forms and channels.
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Subsequently, the particles were preliminarily sieved using a sand screening machine and then refined with a ZBSX-92 laboratory standard vibrating sieve shaker (Shaoxing Shangyu Yueda Instrument Manufacturing Co., Ltd, Shaoxing, China) employing sieve apertures of 20 mm, 10 mm, 5 mm, 2 mm, 1 mm, 0.5 mm, 0.25 mm, and 0.075 mm.
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Chongqing spans the area bounded by 28° 10'–32° 13' N and 105° 11'–110° 11' E (Fig. 1).The land area is 82,400 km 2, with a huge variation in terrain relief and diverse landform types.The climate is subtropical humid monsoon, with an annual average temperature of 16–18 °C and an annual average precipitation of 1000–1350 mm.
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The Hong Kong leader said that Hong Kong and Chongqing have always maintained close exchanges, and a specific cooperation mechanism between the two places will be established through this visit.
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For the single factor, SP has the greatest effect on the compressive strength of mechanism sand concrete and SF has the least effect. ... Fine aggregates were sieved using standard sieves with nominal diameters of 0.16 mm, 0.315 mm, 0.63 mm, 1.25 mm, 2.50 mm, and 5.00 mm, and aggregates within the particle size range of 0.16 mm to 5 mm were ...
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Based in Chongqing, committed to becoming a global reliable mining machinery enterprises ... round grain shape, high efficiency, and high quality, meeting the national standard for medium sand in Zone 2 The material screening is carried out by 8 DES-2460 horizontal screens, with dual amplitude and dual motor drive, which has high screening ...
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Geogrid-reinforced calcareous sand (GRCS) is an attractive alternative to enhance the bearing capacity and stability of geotechnical structures in island and coastal areas. …
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Implementation Plan for Pilot Project to Promote Construction of Zero Waste City in Chongqing (Main Urban Areas) was released on November 15, 2019. What is a zero-waste city? ... mechanisms, laws, regulations, and standards, and also supervision of the entire process. ... a study on recycling technologies of waste sand produced by casting ...
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standard to try to match C55 pumping mechanism sand concrete (try match strength requirement 3 d reached 90%, air content of 3-5%), and to select the benchmark ratio, based
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The Xiamen ISO standard quartz sand was selected as the injected sand layer. The SiO 2 content in quartz sand was more than 97 %, the mud content was less than 0.15 %. Five different sieves with different pore sizes were placed on the vibrator, and five particle size gradations of sand samples were divided and numbered.
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From the present study of bioassay and resistance mechanism of M. persicae, we can draw the conclusion that the peach green aphids from 12 counties of Chongqing have developed different resistance levels to insecticides of neonicotinoid, organophosphate, carbamate, and pyrethroid. The activity of MFO showed a correlation with neonicotinoid ...
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Ecosystems provide essential spatial carriers and services for human activities. In the 1980s, the concept of "sustainable development" emerged and has since evolved to emphasize harmonizing economic development, resource utilization, and environmental protection (Lehtonen, 2004).However, the rapid progress of socioeconomic development has …
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Study on mechanism of removal of sudden Tetracycline by compound modified biological sand filtration process. ... Four types of modified quartz sand (MQS) were synthesized using a composite modification approach combining surface reconstruction and chemical modification methods. ... sulfuric acid (Chongqing Chuandong Chemical Co., Ltd ...
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Shear failure mechanism and parametric study for seawater sea-sand engineered cementitious composites beams reinforced by FRP bars: Finite element analysis ... is close to 1.00, ranging between 0.99 and 1.18. The corresponding mean value and standard deviation are 1.07 and 0.06, respectively.
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