Wetting Properties at Nanometer Scale

The proposed chapter reviews a series of experimental techniques which enable the accurate quantitative study of wetting properties. The introductive part presents some of the many phenomena and processes influenced by wetting, underlining the importance of understanding the fundamental science involved. A few historical considerations about the quantitative study of wetting and related phenomena are given. Next, some of the “classical” techniques employed for studies at the macroscopic scale are presented. The importance of studies of such phenomena at micro- and nanometer level is underlined, as a consequence of the enormous influence that micro- and nanodevices play in our day to day activities, and examples of quantitative studies, involving various measurement techniques, are given from literature. A description of the basic phenomena related to polarization forces in Scanning Polarization Force Microscopy (SPFM) technique is given, followed by experimental details concerning the actual implementation of the technique. Examples of applications of SPFM are given from literature (from the spreading of liquid crystals on solid substrates to studies of corrosion at nanometer level). Particularly, it is emphasized how this versatile technique was successfully used for direct measurements of contact angles for liquid micro- and nano-droplets, enabling the calculation of the dependence of surface potential energy between the surfaces, the spreading coefficient and the disjoining pressure for micro- and nano-droplets

CHEMICAL AND TECHNOLOGICAL PROPERTIES OF BLACKTHORN (PRUNUS SPINOSA) AND ROSE HIP (ROSA CANINA) FRUITS GROWN WILD IN CLUJ-NAPOCA AREA

In this study, the chemical and technological properties of blackthorn (Prunus spinosa) and rose hip (Rosa canina) fruits growing wild in Cluj-Napoca area were analysed. Proximate analysis such as dry matter, moisture content, crude protein, crude fiber, ash, water-soluble, pH and mineral contents were established in this work. Al, B, Ca, K, Mg, Na, P and S were determined as major minerals. Mineral content of samples growing in Cluj-Napoca area were determined by inductively coupled plasma ICP-OES. All samples contained high amounts of K (18711-952 mg/kg), Ca (1504.22-88.06 mg/kg), Mg (972-22.7 mg/kg), P (1511-2104 mg/kg), Na (534-34.8 mg/kg), Al (26.3-1.15 mg/kg) and Fe (16.0-1.97 mg/kg). Technological properties such as projected area, porosity, bulk density, and hectoliter weight were measured. The obtained results revealed nutritional properties and mineral contents of analyzed fruit. It is very important to know the technological properties of the fruits because optimal equipment and working parameters can be used for harvesting, transportation and processing

Inventory of Hydro-Ameliorative Works in the Area of Aghireşu, Cluj County in Order to Establish Measures and Works for Rehabilitation

The objective of the research was to identify agricultural hydro-ameliorative works located in Aghireşu, the area covered by the Nadăş hydrographic basin considering for scientific purpose and economic importance. The studied area is part of the south-west of Someş Plateau and is important for the local community and also for neighboring areas. The influence of the environmental factors, on the basic conditions, for the cultivation and the development of the agricultural crops has a very important role. Land reclamation works applied on agricultural land in the hydrographic basin from the studied area have been over the years measures that have helped to remove the negative consequences on agriculture. Excess of humidity manifested in different forms had a particular impact onagrari soil fertility and hydro-ameliorative works have determined use of abandoned land

Impact of a One Day Crisis Resource Management Training on the Work Satisfaction among Emergency Department Healthcare Staff

AbstractObjective: To evaluate the impact of a single day Crisis Resource Management (CRM) oriented team training, combining didactic and simulation sessions, on work satisfaction of the healthcare staff working in an Emergency Department. Methods: Seventy health professionals with different qualifications, working in an emergency department, were enrolled in the study. After enrollment, participants were asked to complete a work satisfaction questionnaire and to choose a day for the training session according to their availability. Each training session took place in the simulation center and consisted of several elements: didactic session and simulation session, followed by instructor facilitated debriefing. The lecture was focused on medical errors and CRM principles. Two months after, they were asked to complete again the work satisfaction questionnaire. Results: There were no significant improvements on the items evaluated through the work satisfaction questionnaire for none of the professional categories involved, except for 'the possibility to refer the patient to a specialist whenever was considered necessary' for the doctors. Improvements were seen for the same professional category on the following items: workload, leisure time, level of stress at work, time and energy spent on administrative tasks. Conclusions: The findings of this study do not support the effectiveness of a single day CRM training as a tool to improve the work satisfaction among medical staff in ED. Further research is necessary

Experimental research about positioning correction of CNC machine with X-axis up to 12000 millimeters using laser measurement equipment

In this paper we present a research regarding adjustment machining accuracy on CNC machines with long axis for increasing positioning accuracy considering as a factor: thermal expansion effect. The research performed was made using laser equipment on industrial CNC machines used for production of aerospace components made of aluminium alloy extruded profile with length up to 12000 mm. Those parts have very tight tolerances and on milling process appear several factors that influence the repeatability of machining processes, the main one being the thermal expansion effect. The research results prove the improvement of positioning precision using the coefficients obtained from experimental measurements