scholarly journals Frother Characterization Using a Novel Bubble Size Measurement Technique

2022 ◽  
Vol 12 (2) ◽  
pp. 750
Author(s):  
Junyu Wang ◽  
Gordon Forbes ◽  
Elizaveta Forbes
Keyword(s):  
Bubble Size ◽  
Control Strategy ◽  
System Analysis ◽  
High Salinity ◽  
Size Analysis ◽  
Size Measurement ◽  
Novel Method ◽  
User Friendly ◽  
And Control

Bubble size measurement is a vital part of flotation system analysis and diagnostics. This work evaluates a commercial camera probe as a novel method for in situ bubble size measurement. This device is compared to the conventional Anglo Platinum Bubble Sizer (Stone Three TM). It was found that, in laboratory applications, the in situ bubble size analysis technology appears to be a more user-friendly and reliable option for determining bubble size in flotation, whereas the Anglo Platinum Bubble Sizer is more applicable for full scale industrial work. This probe was then used to conduct a rigorous comparison of the behavior of different frother chemistries at a variety of background solution ionic strength conditions. The critical coalescence concentrations and the minimum Sauter mean bubble diameters were determined. Five frothers were compared in terms of their ability to reduce bubble size and sensitivity to salinity. In order to adjust plant recipe and control strategy accordingly, it is recommended that the plant would need to use less frother during periods of the high salinity of process water to achieve the minimum Sauter mean bubble size.

scholarly journals Precise control and measurement of solid–liquid interfacial temperature and viscosity using dual-beam femtosecond optical tweezers in the condensed phase

2016 ◽  
Vol 18 (37) ◽  
pp. 25823-25830 ◽  
Author(s):  
Dipankar Mondal ◽  
Paresh Mathur ◽  
Debabrata Goswami
Keyword(s):  
Optical Tweezers ◽  
Condensed Phase ◽  
Precise Control ◽  
Dual Beam ◽  
Novel Method ◽  
Interfacial Temperature ◽  
Solid Liquid Interface ◽  
Solid Liquid ◽  
And Control

We present a novel method of microrheology based on femtosecond optical tweezers, which in turn enables us to directly measure and controlin situtemperature at microscale volumes at the solid–liquid interface.

scholarly journals Ultra-parallel ChIP-seq by barcoding of intact nuclei

2018 ◽  
Author(s):  
L. Arrigoni ◽  
H. Al-Hasani ◽  
F. Ramírez ◽  
I. Panzeri ◽  
D.P Ryan ◽  
...  
Keyword(s):  
Chromatin Immunoprecipitation ◽  
Large Scale ◽  
Time Points ◽  
Invaluable Tool ◽  
Associated Proteins ◽  
Novel Method ◽  
Workload Reduction ◽  
User Friendly ◽  
Different Sources

AbstractChromatin immunoprecipitation followed by deep sequencing (ChIP-seq) is an invaluable tool for mapping chromatin-associated proteins. However, sample preparation is still a largely individual and labor-intensive process that hinders assay throughput and comparability. Here, we present a novel method for ultra-parallelized high-throughput ChIP-seq that addresses the aforementioned problems. The method, called RELACS (Restriction Enzyme-based Labeling of Chromatin in Situ), employs barcoding of chromatin within intact nuclei extracted from different sources (e.g. tissues, treatments, time points). Barcoded nuclei are pooled and processed within the same ChIP, for maximal comparability and significant workload reduction. The choice of user-friendly, straightforward, enzymatic steps for chromatin fragmentation and barcoding makes RELACS particularly suitable for implementation large-scale clinical studies and scarce samples. RELACS can generate ChIP-seq libraries from hundreds of samples within three days and with less than 1000 cells per sample.

An Innovative Microwave Process for Nanocatalyst Synthesis

2010 ◽  
Vol 8 (1) ◽  
Author(s):  
Claudia Antonetti ◽  
Anna Maria Raspolli Galletti ◽  
Iginio Longo
Keyword(s):  
Selective Hydrogenation ◽  
Large Scale ◽  
Synthesis Methods ◽  
Microwave Chemistry ◽  
Large Scale Preparation ◽  
Palladium Nanocatalysts ◽  
Scale Preparation ◽  
Novel Method ◽  
And Control

The development of greener chemical processes is becoming more and more important because this approach moves towards sustainable methods and products, minimizing pollution and risks for human health and environment. In these perspectives, microwaves seem to fulfil these requirements; in this context, we have tested a novel method both for the synthesis of nanocatalysts and for thermal activation of catalytic reactions. Until now, microwave chemistry has been generally performed inside a closed metal cavity, i.e. a microwave oven, but this approach presents relevant drawbacks, in particular for large scale application. Recently, we have proposed a new, cheap, sustainable process for large scale preparation of nanocatalysts, overcoming the disadvantages of the current synthesis methods. This novel method has been successfully adopted for the preparation in situ of ruthenium, palladium and silver nanoparticles as colloids or on different supports. Our procedure is safe and cheap, enabling to obtain the utmost efficiency and control also for industrial application. The obtained nanocatalysts present small average diameters, good morphology and very narrow sizes distribution with an absolute reproducibility. The ruthenium nanocatalysts were tested in the selective hydrogenation of phenol to cyclohexanone and palladium nanocatalysts were tested in the selective hydrogenation of cinnamaldehyde to hydrocinnamaldehyde, and we obtained good performances in both reactions.

A computer-control program for TEM in situ fatigue experiments

1989 ◽  
Vol 47 ◽  
pp. 620-621
Author(s):  
Kenneth S. Vecchio ◽  
John A. Hunt
Keyword(s):  
Slow Crack Growth ◽  
Computer Control ◽  
Control Program ◽  
Video Tape ◽  
Computer Control System ◽  
Transmission Electron ◽  
In Situ Experiments ◽  
Tremendous Amount ◽  
And Control

In-situ experiments conducted within a transmission electron microscope provide the operator a unique opportunity to directly observe microstructural phenomena, such as phase transformations and dislocation-precipitate interactions, “as they happen”. However, in-situ experiments usually require a tremendous amount of experimental preparation beforehand, as well as, during the actual experiment. In most cases the researcher must operate and control several pieces of equipment simultaneously. For example, in in-situ deformation experiments, the researcher may have to not only operate the TEM, but also control the straining holder and possibly some recording system such as a video tape machine. When it comes to in-situ fatigue deformation, the experiments became even more complicated with having to control numerous loading cycles while following the slow crack growth. In this paper we will describe a new method for conducting in-situ fatigue experiments using a camputer-controlled tensile straining holder.The tensile straining holder used with computer-control system was manufactured by Philips for the Philips 300 series microscopes. It was necessary to modify the specimen stage area of this holder to work in the Philips 400 series microscopes because the distance between the optic axis and holder airlock is different than in the Philips 300 series microscopes. However, the program and interfacing can easily be modified to work with any goniometer type straining holder which uses a penrmanent magnet motor.

Dry chip feedrate control using online chip moisture

TAPPI Journal ◽  
2018 ◽  
Vol 17 (05) ◽  
pp. 295-305
Author(s):  
Wesley Gilbert ◽  
Ivan Trush ◽  
Bruce Allison ◽  
Randy Reimer ◽  
Howard Mason
Keyword(s):  
Production Rate ◽  
Control Strategy ◽  
Rate Control ◽  
Near Infrared ◽  
Dry Mass ◽  
The Other ◽  
Process Variability ◽  
Moisture Sensor ◽  
Feedback Control Strategy ◽  
And Control

Normal practice in continuous digester operation is to set the production rate through the chip meter speed. This speed is seldom, if ever, adjusted except to change production, and most of the other digester inputs are ratioed to it. The inherent assumption is that constant chip meter speed equates to constant dry mass flow of chips. This is seldom, if ever, true. As a result, the actual production rate, effective alkali (EA)-to-wood and liquor-to-wood ratios may vary substantially from assumed values. This increases process variability and decreases profits. In this report, a new continuous digester production rate control strategy is developed that addresses this shortcoming. A new noncontacting near infrared–based chip moisture sensor is combined with the existing weightometer signal to estimate the actual dry chip mass feedrate entering the digester. The estimated feedrate is then used to implement a novel feedback control strategy that adjusts the chip meter speed to maintain the dry chip feedrate at the target value. The report details the results of applying the new measurements and control strategy to a dual vessel continuous digester.

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