Development of a snow-fraction meter based on the conductometric method

1993 ◽  
Vol 18 ◽  
pp. 60-64 ◽  
Author(s):  
Takuo Kitahara ◽  
Masataka Shirakashi ◽  
Yasuhiro Kajio
Keyword(s):  
New Technology ◽  
New Method ◽  
Pipeline System ◽  
Water Mixture ◽  
Test Results ◽  
Practical Application ◽  
Conductometric Method ◽  
Snow Properties ◽  
Snow Water

Hydraulic conveying of snow is one of the most promising techniques for snow removal from an urban area. The method for measuring the fraction of snow in a snow-water mixture flowing in a pipe is a key technique for its practical application. A new method based on the conductometric method has been developed in this study. The method was tested using a prototype snow-fraction meter in a testing apparatus and a closed pipeline system. This type of meter has the advantage of in situ measurement of a wide fraction range from zero up to packed value. The meter is capable of quick response, independent of flow velocity or snow properties and nonintrustive in flow. This paper describes the application of techniques for the development of the meter and the test results. This new method is expected to be useful for hydraulic conveying of ice particles or ice cubes, a new technology in the air-conditioning field.

Development of a snow-fraction meter based on the conductometric method

1993 ◽  
Vol 18 ◽  
pp. 60-64 ◽  
Author(s):  
Takuo Kitahara ◽  
Masataka Shirakashi ◽  
Yasuhiro Kajio
Keyword(s):  
New Technology ◽  
New Method ◽  
Pipeline System ◽  
Water Mixture ◽  
Test Results ◽  
Practical Application ◽  
Conductometric Method ◽  
Snow Properties ◽  
Snow Water

Hydraulic conveying of snow is one of the most promising techniques for snow removal from an urban area. The method for measuring the fraction of snow in a snow-water mixture flowing in a pipe is a key technique for its practical application. A new method based on the conductometric method has been developed in this study. The method was tested using a prototype snow-fraction meter in a testing apparatus and a closed pipeline system. This type of meter has the advantage of in situ measurement of a wide fraction range from zero up to packed value. The meter is capable of quick response, independent of flow velocity or snow properties and nonintrustive in flow. This paper describes the application of techniques for the development of the meter and the test results. This new method is expected to be useful for hydraulic conveying of ice particles or ice cubes, a new technology in the air-conditioning field.

scholarly journals Validation of modeled snow properties in Afghanistan, Pakistan, and Tajikistan

2019 ◽  
Author(s):  
Edward H. Bair ◽  
Karl Rittger ◽  
Jawairia A. Ahmad ◽  
Doug Chabot
Keyword(s):  
Snow Depth ◽  
Snow Water Equivalent ◽  
Median Number ◽  
In Situ Measurements ◽  
Snow Properties ◽  
Wide Range ◽  
Spatial Estimates ◽  
Snow Water ◽  
Critical Layers

Abstract. Ice and snowmelt feed the Indus and Amu Darya rivers, yet there are limited in situ measurements of these resources. Previous work in the region has shown promise using snow water equivalent (SWE) reconstruction, which requires no in situ measurements, but validation has been a problem until recently when we were provided with daily manual snow depth measurements from Afghanistan, Tajikistan, and Pakistan by the Aga Khan Agency for Habitat (AKAH). For each station, accumulated precipitation and SWE were derived from snow depth using the SNOWPACK model. High-resolution (500 m) reconstructed SWE estimates from the ParBal model were then compared to the modeled SWE at the stations. The Alpine3D model was then used to create spatial estimates at 25 km to compare with estimates from other snow models. Additionally, the coupled SNOWPACK and Alpine3D system has the advantage of simulating snow profiles, which provide stability information. Following previous work, the median number of critical layers and percentage of facets across all of the pixels containing the AKAH stations was computed. For SWE at the point scale, the reconstructed estimates showed a bias of −42 mm (−19 %) at the peak. For the coarser spatial SWE estimates, the various models showed a wide range, with reconstruction being on the lower end. For stratigraphy, a heavily faceted snowpack is observed in both years, but 2018, a dry year, according to most of the models, showed more critical layers that persisted for a longer period.

Method for Producing Twist Drills by Extrusion Using a Three-Slide Forging Press

2014 ◽  
Vol 622-623 ◽  
pp. 129-135 ◽  
Author(s):  
Tomasz Bulzak ◽  
Janusz Tomczak ◽  
Zbigniew Pater
Keyword(s):  
New Technology ◽  
Experimental Tests ◽  
New Method ◽  
Twist Drill ◽  
Practical Application ◽  
Laboratory Conditions ◽  
Conventional Process ◽  
Theoretical Assumptions ◽  
Forging Press ◽  
Twist Drills

The study presents a new method, developed by the authors, for producing twist drills by extrusion using a three-slide forging press. The method consists in using two sectional dies with specially shaped impressions that allow the removal of a ready drill from the die without unscrewing. The study describes the main assumptions of the new method for twist drill extrusion, discussing benefits offered by this method when compared to the conventional process for producing twist drills by extrusion using a monolithic die. In order to verify the proposed solution, dies conforming to the assumptions of the new method were designed and executed. Experimental tests were conducted under laboratory conditions using a three-slide forging press. The model of the material used in the experiments was assigned the properties of Pb1 lead. As a result of the experiments, the theoretical assumptions of the new method could be examined and its practical application verified. Also, ideas for further research aimed at better understanding of the new technology for producing twist drills by extrusion are presented.

Application of a New Technology for Reprocessing of Wastes Within the Framework of Rehabilitation of Uranium Mines Operated by In Situ Leaching

2011 ◽  
Author(s):  
Gagik Martoyan ◽  
Garik Nalbandyan ◽  
Lavrenti Gagiyan ◽  
Gagik Karamyan ◽  
Artak Barseghyan ◽  
...  
Keyword(s):  
Nuclear Fuel ◽  
Industrial Production ◽  
New Technology ◽  
New Method ◽  
Liquid Acid ◽  
Uranium Extraction ◽  
Uranium Mines ◽  
Environmentally Safe ◽  
Acid Streams

It is essential the environmentally safe industrial production of nuclear fuel especially in the case of uranium extraction by In Situ Leaching, when the environment and the deep extraction of uranium are important problems. In the presented paper it is studied the feasibility of the application of an electrodialysis method for the deep extraction of uranium and radium from liquid (acid) streams. It is proposed to apply a new electro-hydro-metallurgical [1] extraction and refining method to ensure the necessary extraction level of elements. In the same time the new method ensures the recycling of acids used in the process.

A new method for the in situ assay of α-glucosidase activity and inhibitor screening through an enzyme substrate-mediated DNA hybridization chain reaction

2019 ◽  
Vol 43 (24) ◽  
pp. 9458-9465
Author(s):  
Xiquan Yue ◽  
Lihong Su ◽  
Xu Chen ◽  
Junfeng Liu ◽  
Longpo Zheng ◽  
...  
Keyword(s):  
Small Molecule ◽  
Dna Hybridization ◽  
New Method ◽  
Hybridization Chain Reaction ◽  
Chain Reaction ◽  
Inhibitor Screening ◽  
Glucosidase Activity ◽  
Enzyme Substrate ◽  
In Situ Assay

The strategy is based on small molecule-mediated hybridization chain reaction.

Mathematical Modeling of Pulsation Dampeners in Fluid Power Systems

2007 ◽  
Author(s):  
Shanzhong Duan ◽  
Mutasim E. Gamal
Keyword(s):  
Power Systems ◽  
New Technologies ◽  
New Method ◽  
Fluid Power ◽  
Pipeline System ◽  
Hydraulic Circuit ◽  
Modeling And Analysis ◽  
Fluid Resistance ◽  
Fluid Systems ◽  
Fluid Power Systems

This paper presents a new method for computer-aided modeling and analyzing of pulsation dampeners used in fluid power systems for vibration reduction. The pulsation dampeners are widely used in various fluid power systems to reduce vibration induced by power pumps. The vibration induced by power pumps in fluid systems may be severe enough to cause the damage of components in pipelines if a pulsation dampener is not installed. However, the current methods used in industries for the design and analysis of the dampeners are manually experience-orientated procedures. They are not adaptable to new technologies. The new modeling method will efficiently automate and improve the current modeling and analysis procedure of various pulsation dampeners with a minimum user effort. The proposed method is a result of utilizing the analogy between electrical circuits and hydraulic circuits. In the new method, a spherical pulsation dampener can be equivalent to a lumped hydraulic circuit installed in a distributed fluid pipeline system. The new method has been developed from the authors’ previous work of an impedance-based model in which only the effect of capacitance and inductance was considered without fluid resistance. In reality, the influence of fluid resistance is significant. This paper will take fluid resistance into considerations and form a resistance-impedance-based model.

Sign in / Sign up

Export Citation Format

Share Document