Search results for " Principi"

Radošās rakstīšanas uzdevumi angļu valodas stundās skolēnu skaļās lasīšanas prasmju pilnveidei 6. klasē

2015

Skolotāji reti mācību programmā iekļauj stundas, kas veltītas skaļās lasītprasmes uzlaboš anai un lielākoties skaļās lasītprasmes principus izklāsta saistībā ar mācību grāmatās piedāvātajiem tekstiem, vai šos principus angļu valodas stundās neaplūko vispār. Tieš i tādēļ daudziem skolēniem ir ierobežotas zināš anas par to, kā ir jāizklausās tekoš am lasījumam. Turklāt skolēniem ir maz iespēju eksperimentēt, lasot tekstu skaļi, jo vairumā gadījumu skolotāji mācību procesā koncentrējas uz satura izklāstu nevis uz fonētikas principiem. Šis darbības petījums tika veikts ar mērķi izpētīt, kā strukturēti un skolotāja parraudzīti rado šās rakstīš anas uzdevumi sekmē skolēnu skaļās lasītprasmes izau…

Brīvības princips paidagoģikā: diploma darbs [Brīvības princips pedagoģijā...]

1933

A quantitative method of photoadsorption determination for irradiated catalyst in liquid–solid system

2009

WOS: 000266963000002

A Collection of Chemical Reaction Engineering Solutions in Photocatalysis

2017

There are problems in photocatalysis that researchers cannot disregard in a rigorous study of photocatalytic systems. The purpose of the present work is to show how chemical reaction engineering can answers to the previous questions, thus helping scientists to face researches on photocatalysis more successfull and consistenty

Photocatalytic Ozonation: from Science to Aquaculture Applications

2016

Demographic growth and management of water and food resources are probably the most challenging issues of the coming years. In this scenario, intensive aquacultura will be increasingly important in the near future

Validation of a two-dimensional modeling of an externally irradiated slurry photoreactor

2015

Abstract A two-dimensional model describing the behavior of a batch cylindrical photoreactor has been validated through a series of photocatalytic reactivity runs. The light intensity radiation field produced by 1–6 external UV fluorescent lamps was modeled together with Langmuir–Hinshelwood kinetics and 4-nitrophenol (NP) and Degussa P25 TiO 2 were used as the probe molecule and the catalyst, respectively. The experiments were carried out under different conditions of light intensity, photocatalyst amount and substrate concentration. The model parameters were the kinetic constant of substrate adsorption, desorption and degradation and the exponent of the power law expressing the kinetics d…

Il principio del non refoulement tra controllo dell'accesso al territorio dell'Unione europea e protezione dei diritti umani

2020

Nonostante il non-refoulement sia un principio cardine del diritto internazionale dei rifugiati, il suo preciso ambito di applicazione e l’esatta individuazione degli obblighi a carico degli Stati sono oggetto di incertezza per la tensione costante tra due opposte tendenze. In quanto espressione di un valore umanitario fondamentale, sono fiorite interpretazioni estensive, ma, in quanto limite al potere sovrano dello Stato di regolare l’accesso al territorio, sono emerse tendenze di segno restrittivo. L’articolo presenta la politica comune di asilo come sottoposta alla stessa tensione e ne descrive per grandi linee gli aspetti che costituiscono un ampliamento della protezione offerta dal dir…

Structure and Morphology Control in Polymer Forming Through the Thermal History

2011

Two examples of the application of the Continuous Cooling Transformation (CCT) method for investigating polymer solidification under processing conditions are illustrated. One example concerns the solidification behaviour of syndiotactic polystyrene (sPS) from the melt, showing an anomalous trend of density versus cooling rate, exhibiting a minimum around 1 °C/s. Once phase composition is obtained from WAXD deconvolution, density can be closely predicted, its minimum depending on the competition among crystalline phases upon increasing cooling rate. Another example regards the formation of Poly-Left Lactic Acid (PLLA) foams via Thermally Induced Phase Separation (TIPS) by starting from ther…

Polymer Solidification under Pressure and High Cooling Rates

2000

Abstract Polymer solidification under processing conditions is a complex phenomenon in which the kinetics of flow, high thermal gradients and high pressures determine the product morphology. The study of polymer structure formed under pressure has been mainly made using conventional techniques such as dilatometry and differential scanning calorimetry under isothermal conditions or non isothermal conditions but at cooling rates several orders of magnitude lower than those experienced in industrial processes. A new equipment has been recently developed and improved to study the crystallization of polypropylene when subjected to pressure and cooled rapidly. An experimental apparatus essentiall…

Characterization of PLLA scaffolds for biomedical applications

2017

The porosity and pore size distribution of three-dimensional scaffolds have direct implications on their biomedical applications (tissue engineering, drug delivery, and wound dressing). Accordingly, in this paper, a fast, facile, and conservative method relying on low-field nuclear magnetic resonance (LF-NMR) for the evaluation of mean pore size and pore size distribution of polymeric scaffolds is reported. The applicability of the technique is demonstrated on poly-L-lactic acid scaffolds fabricated using the thermal induced phase separation. Results obtained through LF-NMR are successfully compared to scanning electron microscope and X-ray microcomputed tomography micrographs.