Risultati di prove di controllo in impianti di mungitura del sassarese

The principal results are reported of tests carried aut on 86 milking machine installations on farms in the province of Sassari. On examination of the results serious and frequent defects as a whole. Some were due to lack of maintenance and assistance, others to errors in planning and installations, and still others were by an irrational use of the installations on the part of the agricu1tural operators. All this has shown that it wuold be desireble to consider: certification of the milking machine installations; more widespread controls on farms, to be carried out annually; the teaching of reational milking techinnques to agricultural operators

Aspetti ergonomici ed organizzativi della mungitura meccanica

We have exposed the most recent acqisitions of the ergonomical aspects of the mechanical milking, connected to the structure of working place, to the environmental conditions and to the physical and mental fatiguing of the milker in the different installations. We have also reported the results, both of an inquiry by sample fitted to attain informations on the general conditions of milkers-work in the different installations, and of a more specificd survey in six installations, in place and position, fitted to ascertain the influence of the kind of installation and of the number of groups per attached, on the tranfers, on the routines and on the productivity of milker's work. At last, on the base of these knowledges, we define the routines, the number of groups per attached and the connected productivity attainable, respecting, on the one hand the organising elliciency and, on the other, the exigences of the man

Raccolta delle olive con macchina scuotitrice: risultati di prove continuative di campo ed analisi dei limiti d'impiego della macchina

The technical, operative and economical results are reported of tests conducted in Sardinia for the mechanical pick up of olives, with the shaking machine Mono Boom series 300. The analyses of the resu1ts have allowed the authors to give indications on the possibilities and on the limits of usage of the machine while working and also: - on the behavior of the separation force and on the level of ripeness of the olives; - on the tree conformation; - on the quantity of production; - on the number of times the machine is used; - on the best harvest period

Mungitura meccanica degli ovini in Sardegna: risultati di un biennio di prove

Three installations of milking at column have been followed for two years also in comparaison with the manuel milking. The analysis of the results of the functional prooves and of the importance of the times and of the productions, permit to show the want of the installations and to define of good moduli of milking

Rilievi sulla mungitura meccanica della pecora sarda e realizzazione di una nuova strumentazione

Through the remark of the transfer lines of the milk of two hals udders during the mechanical milking of the Sard sheep, the AA. show the advantage attainable working at an hollow level of 44,0 kPa instead of 50,5 kPa. They are then explained the characteristics of a new instrumentation for telemeasure, purposely prepared, that allows to record contemporaneously the activity motor of the udders and the parameters of working of the mechanical milking

The use of the indentation test for studying the solidification behaviour of different semicrystalline polymers during injection moulding

An in-line method for monitoring the solidification process during injection molding of semicrystalline polymers (demonstrated previously in J. Appl. Polym. Sci.2003, 89, 3713) is based on a simple device, where an additional ejector pin is pushed on the injection molded part at different times during the solidification phase. The ‘indentation depth profile’, i.e., residual deformation as a function of time, was obtained and allowed to determine the evolution of the solidification front in the mold as a function of the cooling time. The present work shows the reliability and the powerfulness of the aforementioned method for a large variety of different semicrystalline polymers (PET, PBT, polyamide-6 PA6, isotactic poly(propylene) iPP) characterized also by different molecular weight and/or nucleating agents. The results show that the indentation test may be considered as a ‘predictive’ tool to qualitatively and quantitatively compare the solidification process of different polymers and polymer grades during injection molding

Preface to Special Section XXXII "CIOSTA-CIGRV 2007" of CIGR Ejournal Vol. IX

Rosana G. Moreira, Editor-in-Chief; Texas A&M UniversityThis is a paper from International Commission of Agricultural Engineering (CIGR, Commission Internationale du Genie Rural) E-Journal Volume 9 (2007): Preface to Special Section XXXII "CIOSTA-CIGRV 2007" of CIGR Ejournal Vol. I

PLLA biodegradable scaffolds for angiogenesis via Diffusion Induced Phase Separation (DIPS)

A critical obstacle in tissue engineering is the inability to maintain large masses of living cells upon transfer from the in vitro culture conditions into the host in vivo. Capillaries, and the vascular system, are required to supply essential nutrients, including oxygen, remove waste products and provide a biochemical communication “highway”. For this reason it is mandatory to manufacture an implantable structure where the process of vessel formation – the angiogenesis – can take place. In this work PLLA scaffolds for vascular tissue engineering were produced by dip-coating via Diffusion Induced Phase Separation (DIPS) technique. The scaffolds, with a vessel-like shape, were obtained by performing a DIPS process around a nylon fibre whose diameter was 700 μm. The fibre was first immersed into a 4% PLLA dioxane solution and subsequently immersed into a second bath containing distilled water. The covered fibre was then rinsed in order to remove the excess of dioxane and dried; finally the internal nylon fibre was pulled out so as to obtain a hollow biodegradable PLLA fiber. SEM analysis revealed that the scaffolds have a lumen of ca. 700 μm. The internal surface is homogeneous with micropores 1–2 μm large. Moreover, a cross section analysis showed an open structure across the thickness of the scaffold walls. A cell culture of endothelial cells was carried out into the as-prepared scaffolds. The result showed that cells are able to grow within the scaffolds and after 3 weeks they begin to form a “primordial” vessel-like structure