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相关概念视频

Moisture Content and Bulking of Aggregate01:10

Moisture Content and Bulking of Aggregate

207
The moisture content of aggregates is a crucial factor in construction, particularly in concrete mixing, as it influences the total water required in the mix. Moisture content represents the water coated on the exterior surface of the aggregate existing in a saturated and surface-dry condition. The total water content of a moist aggregate is the sum of its moisture content and water absorption.
When aggregates are exposed to rain or sit in stockpiles, they absorb moisture, which must be...
207
Porosity and Absorption of Aggregate01:20

Porosity and Absorption of Aggregate

401
Aggregates contain pores of varying sizes; while some are completely enclosed within the particles, others open onto the surface, allowing water to penetrate. The porosity of aggregates is a major factor contributing to the overall porosity of concrete, given that aggregates constitute about three-quarters of concrete's volume.
When all pores in an aggregate are filled with water, the aggregate is considered saturated and surface-dry. If left in dry air, water will evaporate until the...
401
Drying Shrinkage01:21

Drying Shrinkage

155
When hardened concrete is exposed to air with a relative humidity of less than 100 percent, it begins to lose the free water within its capillaries. As this water evaporates, the water initially adsorbed onto the calcium silicate hydrates migrates towards these now empty spaces and eventually evaporates as well. Over time, as more water leaves, the volume of the concrete decreases, a phenomenon known as drying shrinkage.
A portion of this drying shrinkage can be reversed; if the concrete is...
155
Specific Gravity of Aggregate01:19

Specific Gravity of Aggregate

382
Aggregates typically contain pores, which can be either permeable or impermeable. Considering the pores in the aggregates, the specific gravity of aggregates is defined in three different forms, namely, bulk or gross specific gravity, apparent specific gravity, and absolute specific gravity.
Bulk or gross specific gravity is calculated by taking the ratio of the mass of aggregates in the saturated surface-dry state to the total volume that includes both the solids and the voids within the...
382
Measurement of Air Content in Concrete01:23

Measurement of Air Content in Concrete

267
Air content measurement in concrete is critical for ensuring structural integrity and durability of concrete structures, especially in environments prone to severe weather conditions. Accurate air content analysis optimizes concrete's resistance to freeze-thaw cycles and enhances its workability and strength. Several methods are standardized under ASTM guidelines to measure the air content in fresh concrete, each suitable for different concrete types and conditions.
The pressure method,...
267
Bulk Density of Aggregate01:22

Bulk Density of Aggregate

659
Bulk density refers to the mass of aggregate particles that would fill a unit volume. The concept of bulk density originates from the inability to pack aggregate particles in a manner that completely eliminates void spaces. Hence, the term bulk refers to the volume that encompasses both the aggregates and the voids. This measurement is crucial when aggregates are batched by volume and is used to convert quantities by mass to volume.
Most natural mineral aggregates, like sand and gravel,...
659

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相关实验视频

Updated: Sep 11, 2025

Method to Produce Durable Pellets at Lower Energy Consumption Using High Moisture Corn Stover and a Corn Starch Binder in a Flat Die Pellet Mill
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在流体床干燥过程中预测颗粒水分含量.

Paloch Chinwattanawongwan1, Narueporn Sutanthavibul2, Oran Kittithreerapronchai3,4

  • 1Department of Industrial Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok, 10330, Thailand.

AAPS PharmSciTech
|August 14, 2025
PubMed
概括

湿度-温度探针提供了一种精确的方法来确定制药湿颗粒干燥的终点. 这种基于传感器的方法可以在商业规模的液化床干燥机中提供准确的水分含量监测.

关键词:
终点确定终点的确定.湿颗粒的湿颗粒化方法液床干燥 液床干燥 液床干燥含水量 含水量 含水量预测模型的预测模型.生产规模的生产规模.

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Methods for the Self-integration of Megamolecular Biopolymers on the Drying Air-LC Interface
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Methods for the Self-integration of Megamolecular Biopolymers on the Drying Air-LC Interface

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Fabric Moisture Uniform Control to Study the Influence of Air Impingement Parameters on Fabric Drying Characteristics
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相关实验视频

Last Updated: Sep 11, 2025

Method to Produce Durable Pellets at Lower Energy Consumption Using High Moisture Corn Stover and a Corn Starch Binder in a Flat Die Pellet Mill
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Methods for the Self-integration of Megamolecular Biopolymers on the Drying Air-LC Interface
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Fabric Moisture Uniform Control to Study the Influence of Air Impingement Parameters on Fabric Drying Characteristics
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科学领域:

  • 制药制造业 制药制造业 制药制造业
  • 工艺工程的过程工程.
  • 分析化学 分析化学

背景情况:

  • 制造过程的持续时间会影响药品的质量.
  • 准确的终点确定对于稳定的颗粒质量至关重要.
  • 传统方法包括时间和属性定义的终点.

研究的目的:

  • 为了评估湿度-温度探针和近红外 (NIR) 光谱,用于监测颗粒的水分含量.
  • 为了比较这些方法在商业规模的流化床干燥器 (FBD) 中对终点确定的准确性.
  • 在制药干燥过程中确定实用和精确的解决方案,以实时监测制药干燥过程中的水分.

主要方法:

  • 在商业规模的液化床干燥机 (FBD) 上进行的实验处理了250公斤的湿颗粒.
  • 在输入/输出空气管道上使用湿度-温度传感器探针进行连续数据收集.
  • 使用近红外 (NIR) 光谱仪与光纤探针用于手动采集光谱数据.
  • 使用这两种方法的数据开发了含水量 (MC) 的预测模型.
  • 使用根平均平方误差 (RMSE) 评估模型准确性.

主要成果:

  • 湿度-温度探针模型显示了MC的更高的预测准确性,RMSE为0.11.
  • 该NIR光谱模型实现了较低的预测准确度,RMSE为0.29.
  • 在整个干燥过程中,基于传感器的监控被证明是实时MC跟踪的有效方法.

结论:

  • 湿度-温度探针为商业规模的FBD操作中终点确定提供了精确和实用的解决方案.
  • 基于传感器的湿度含量监测为此应用提供了与NIR光谱相比更高的精度.
  • 这种方法可以加强对干燥过程的控制,从而有可能提高制药品质量.