Search results for "Ammoniac"

Effetto della forma azotata e della modalità di distribuzione sulla produzione e la qualità di lattuga

2009

Effet de l'humidité sur la réponse à l'ammoniac de capteurs conductimétriques à base de matériaux moléculaires

2012

Many ammonia sensors are available but the consideration of the humidity effect is scarcely insured even by manufacturers. The aim of this thesis is to propose a conductimetric transducer capable tomeasure ammonia selectively, with enough accuracy for air quality control, in a variable humidity environment. To reach this goal, we used thin film resistors made of cobalt phthalocyanines as semiconductor. This study deals with thin films processing made by vacuum evaporation, solventcast and electrodeposition. Automated workbenches were developed to perform electrical measurements under argon and to study the response of sensors to dry or humid ammonia by meansof 1 min / 4 min-long exposure / …

Development of a microwave transduction gas sensor

2013

In this work, we have developed a new gas-sensing transduction based on the propagation of microwave inside a sensitive material to detect atmospheric pollutants at room temperature. First, we present a short overview of the main gas-sensing transduction in the litterature. These techniques operate in frequency ranges different from microwaves. The dielectric permittivity is the main physical parameter in the microwave transduction. The principle is based on the excitation of a sensitive material by a microwave electromagnetic field in a propagative structure. The reflected wave is specific to the excitation's frequency. It depends on the interaction between the sensitive material and the p…

Azoto

2015

1. Introduzione p. 282 2. Determinazione dell’azoto totale con analizzatore elementare p. 284 3. Determinazione dell’azoto totale con metodo semi-micro-Kjeldahl p. 284 4. Determinazione dell’azoto totale con metodo semi-micro-Kjeldahl modificato p. 287 5. Determinazione dell’azoto totale estraibile con soluzione salina con metodo micro-Kjeldahl p. 291 6. Determinazione dell’azoto totale estraibile con soluzione salina con metodo micro-Kjeldahl modificato p.294 7. Determinazione colorimetrica degli ioni ammonio estraibili p. 296 8. Determinazione colorimetrica degli ioni nitrato estraibili p. 298 9. Estrazione dell’azoto totale idrolizzabile con acido cloridrico p. 300 10.Determinazione dell…

Aurea®: fertilizzanti azotati additivati con inibitori dell’ureasi per ridurre le perdite di azoto nei sistemi semiaridi

2015

Crystal structure of cis-bis­(μ-β-alanine-κ2 O:O′)bis[tri­chlorido­rhenium(III)](Re–Re) sesquihydrate

2015

A dirhenium(III) cis-di­carboxyl­ate complex is reported, which is representative of a small class of zwitterionic ammonia­carboxyl­ato complexes involving a quadruple metal–metal bond.