scholarly journals Optical Methods for Firmness Assessment of Fresh Produce: A Review

2017 ◽  
Author(s):  
Jason Sun ◽  
Rainer Künnemeyer ◽  
Andrew McGlone
Keyword(s):  
Fresh Produce ◽  
Optical Methods

Preparation and characterisation of vanadium pentoxide supported rhodium catalyst

1988 ◽  
Vol 46 ◽  
pp. 946-947
Author(s):  
A. Legrouri
Keyword(s):  
Aqueous Solution ◽  
Thermal Decomposition ◽  
Physicochemical Properties ◽  
Surface Area ◽  
Vanadium Pentoxide ◽  
High Purity ◽  
Gas Adsorption ◽  
Rhodium Catalyst ◽  
Optical Methods ◽  
Reducible Oxides

The industrial importance of metal catalysts supported on reducible oxides has stimulated considerable interest during the last few years. This presentation reports on the study of the physicochemical properties of metallic rhodium supported on vanadium pentoxide (Rh/V2O5). Electron optical methods, in conjunction with other techniques, were used to characterise the catalyst before its use in the hydrogenolysis of butane; a reaction for which Rh metal is known to be among the most active catalysts.V2O5 powder was prepared by thermal decomposition of high purity ammonium metavanadate in air at 400 °C for 2 hours. Previous studies of the microstructure of this compound, by HREM, SEM and gas adsorption, showed it to be non— porous with a very low surface area of 6m2/g3. The metal loading of the catalyst used was lwt%Rh on V2Q5. It was prepared by wet impregnating the support with an aqueous solution of RhCI3.3H2O.

Investigation of cluster layers of small netal particles by TEM, SEM, EELS and by photoacoustic spectroscopy

1990 ◽  
Vol 48 (4) ◽  
pp. 250-251
Author(s):  
H. Seiler ◽  
U. Haas ◽  
K.H. Körtje
Keyword(s):  
Bulk Material ◽  
High Vacuum ◽  
Optical Methods ◽  
Metal Particles ◽  
Silver Particles ◽  
Low Loss ◽  
Plasmon Excitation ◽  
First Results ◽  
Diffraction Patterns ◽  
Small Metal Particles

The physical properties of small metal particles reveal an intermediate position between atomic and bulk material. Especially Ag has shown pronounced size effects. We compared silver layers evaporated in high vacuum with cluster layers of small silver particles, evaporated in N2 at a pressure of about 102 Pa. The investigations were performed by electron optical methods (TEM, SEM, EELS) and by Photoacoustic (PA) Spectroscopy (gas-microphone detection).The observation of cluster layers with TEM and high resolution SEM show small silver particles with diameters of about 50 nm (Fig. 1 and Figure 2, respectively). The electron diffraction patterns of homogeneous Ag layers and of cluster layers are similar, whereas the low loss EELS spectra due to plasmon excitation are quite different. Fig. 3 and Figure 4 show first results of EELS spectra of a cluster layer of small silver particles on carbon foil and of a homogeneous Ag layer, respectively.

Comparison of sensitivity of the refractometric methods of frustrated total internal reflection and surface plasmon resonance

2020 ◽  
pp. 44-49
Author(s):  
I. N. Pavlov
Keyword(s):  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Total Internal Reflection ◽  
Resonance Method ◽  
Internal Reflection ◽  
Optical Methods ◽  
Thin Boundary Layer ◽  
Experimental Conditions ◽  
Frustrated Total Internal Reflection

Two optical methods, namely surface plasmon resonance imaging and frustrated total internal reflection, are described in the paper in terms of comparing their sensitivity to change of refractive index of a thin boundary layer of an investigated medium. It is shown that, despite the fact that the theoretically calculated sensitivity is higher for the frustrated total internal reflection method, and the fact that usually in practice the surface plasmon resonance method, on the contrary, is considered more sensitive, under the same experimental conditions both methods show a similar result.

APPLICATION OF PHYSICAL AND OPTICAL METHODS FOR SOOT EVALUATION IN A FULL-SCALE POWER PLANT

1995 ◽  
Author(s):  
Loretta Bonfanti ◽  
Leonardo Castellano ◽  
Sauro Pasini ◽  
Nice Pintus ◽  
Christine Mounaim-Rousselle
Keyword(s):  
Power Plant ◽  
Full Scale ◽  
Optical Methods

Successes and Challenges Implementing a “Fresh from the Farm” Fundraising Program in Schools

2020 ◽  
pp. 1-4
Author(s):  
Jennifer Buccino ◽  
Leslie Whittington-Carter
Keyword(s):  
Local Food ◽  
Fresh Produce ◽  
Ministry Of Education ◽  
Fruit And Vegetable ◽  
School Food ◽  
Financial Model ◽  
High Satisfaction ◽  
Food And Beverage ◽  
Feasible Alternative ◽  
Successes And Challenges

In 2013, 4 partner organizations: Dietitians of Canada (DC); Ontario Fruit and Vegetable Growers Association; Ontario Ministry of Agriculture, Food and Rural Affairs; and Ontario Ministry of Education created “Fresh from the Farm” (FFF), a healthy fundraiser for Ontario Schools. FFF was designed to support the Ontario government’s School Food and Beverage Policy and Local Food Act and to provide a feasible alternative for less healthy fundraising options. This paper outlines the program successes and challenges over the 6 years of DC’s involvement. After 6 years, over 1700 schools successfully participated in FFF and over $2 million has been paid to Ontario farmers for product and distribution. The average participating school has generated $2040 in sales towards their fundraising efforts, equating to 770 kg (1700 lbs) of fresh produce per school. Schools reported high satisfaction with FFF, with over 90% of participating schools enrolling in subsequent years. The main reasons for satisfaction included: easy to implement, profitable, offers a healthy alternative to “traditional” fundraising programs, and provides great value for cost. The main challenges were logistics of sourcing and delivery, higher than anticipated costs that made the financial model less feasible than predicted, and competition from other fundraisers.

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