Search results for "riga"
showing 10 items of 700 documents
Changes in soil redox potential in response to flood irrigation with waste water in central Mexico
2017
Irrigation with untreated sewage water adds fresh organic matter to the soil. When it is applied by flooding, as in the Mezquital Valley of Mexico, many of the pores in the soil become temporarily waterlogged and depleted of oxygen, and reduction generates nitrous oxide (N2O) and methane (CH4). We monitored the redox potential, Eh, in the soil at two sites in the Mezquital Valley to discover whether the short-term gaseous emissions matched the changes in Eh. One site is irrigated periodically by flooding with waste water and has alfalfa, rye grass and maize grown in succession; the other site grows maize with water from summer rain only. Each electrode buried in the soil for the purpose pro…
Absorption and desorption of liquid water by a superabsorbent polymer: Effect of polymer in the drying of the soil and the quality of certain plants
2001
In this work, we were interested in the study of the kinetic behavior of the reaction of drying soil representing the Marrakesh region (south of Morocco) in the presence of an superabsorbent polymer. The presence of a polymer in the soil diminished the kinetic drying of the soil, which will have as an application a reduction in water loss in the process of irrigation. The presence of a polymer in the soil enables a complete modification of the kinetic regimes controlling the soil-drying kinetic. We also realized the first study of the behavior of certain selected plants in the melange of a soil and a polymer. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 83: 234–243, 2002
Absorption and desorption of liquid water by a superabsorbent polyelectrolyte: Role of polymer on the capacity for absorption of a ground
2001
To study the potentialities of a polyelectrolyte superabsorbent for the storage of water, we have studied a ground representative of the area of Haouz (area of Marrakesh, South of Morocco) in the presence of polymer. We sought the optimal proportions allowing the best retention of water by the mixture made up of the polymer and the ground and to prolong the storage period of water in the ground. We have also studied the effect of certain ions and the pH on the capacity for absorption of polymer. These ions can be naturally present in the ground or introduced by the means of manure and pesticides. The presence of polymer in the ground makes it possible to increase the capacity for absorption…
Trapping and Immobilization of DNA Molecules Between Nanoelectrodes
2011
DNA is one of the most promising molecules for nanoscale bottom-up fabrication. For both scientific studies and fabrication of devices, it is desirable to be able to manipulate DNA molecules, or self--assembled DNA constructions, at the single unit level. Efficient methods are needed for precisely attaching the single unit to the external measurement setup or the device structure. So far, this has often been too cumbersome to achieve, and consequently most of the scientific studies are based on a statistical analysis or measurements done for a sample containing numerous molecules in liquid or in a dry state. Here, we explain a method for trapping and attaching nanoscale double-stranded DNA …
DNA as Building Material at the Nanoscale: From Concepts to Software-aided Design
2017
The Effect of Plant Water Status on the Chemical Composition of Pistachio Nuts (Pistacia vera L. Cultivar Bianca)
2020
Pistachio nuts are worldwide appreciated for their chemical and organoleptic profiles. There are several studies on the influence of irrigation on pistachio productivity, whereas there are little available data on the influence on nut quality. In this study we characterized some qualitative traits of pistachio nuts cultivar Bianca in Mediterranean environment and how plant water status affected them. Water status had a positive and significant influence on the chlorophylls content, nuts from less stressed trees showed higher values of chlorophyll a (14.7 mg/100 g) and b (21.1 mg/100 g) compared than more stressed trees (9.3 and 11.5 mg/100 g for a and b, respectively). Solid phase microextr…
Indagini su Tuta absoluta (Lepidoptera: Gelechiidae) in Sicilia: Andamento delle infestazioni, valutazione della presenza di nemici naturali ed effet…
Tuta absoluta è stata segnalata per la prima volta in Italia nel 2008 e in Sicilia nel 2009. Le larve causano mine fogliari e gallerie nei frutti, con conseguenti ingenti danni alle coltivazioni di pomodoro. Il primo capitolo della presente tesi riguarda ricerche condotte per studiarne i livelli di infestazione, l’andamento dei voli dei maschi e rilevarne la presenza di nemici naturali viventi a carico del fitofago in condizioni naturali in un campo nel comprensorio di Naro (AG) C/da Diesi, nel 2013 e 2014. Le varietà di pomodoro utilizzate sono state “Pizzutello” e “Piccadilly”. Inoltre, durante i due anni è stato impiantato e mantenuto un allevamento di piante di pomodoro sane e infestate…
Aigua, irrigació, hortes i patrimoni al territori valencià.
2014
L'aigua és un deis recursos naturals més importants per a la vida quotidiana de I'ésser huma. I el País Valencia és un territori de I'area mediterrania caracteritzat per la variabilitat i escassetat deis seus recursos hidraulics. Els espais de regadiu que conté són per tant un veritable exponent del patrimoni cultural del qual pot estar orgullós un poble, perque encara són vius. De fet, la cultura de I'aigua transcendeix allo que representa el patrimoni material i referma també el seu caracter immaterial quan s'endinsa en I'ambit de la tradició oral, els sabers i les formes de ser com a poble.
Norvēģijas uzņēmumi Latvijā: darba kultūra Latvijas kontekstā
2018
Maģistra darba tēma “Norvēģijas uzņēmumi Latvijā: darba kultūra Latvijas kontekstā”. Autore izvēlējās šo tēmu, jo vēlas veikt pētījumu Norvēģijas uzņēmumā Latvijā, kurā viņa strādā. Pētījuma mērķis ir atrast un analizēt darba kultūras atšķirības starp divām Baltijas Jūras Reģiona valstīm – Latviju un Norvēģiju. Šie aspekti ietver: vērtības un prioritātes, dzimumu līdztiesību, darba un privātās dzīves līdzsvaru, lietišķo komunikāciju, etiķeti un darba vidi. Lai sasniegtu darba mērķi, tika izvirzīti šādi uzdevumi: •Apkopot pieejamo informāciju par Norvēģijas un Latvijas darba kultūru no latviešu, angļu un norvēģu valodas avotiem; •Izpētīt kādas atšķirības novērojamas abu valstu darba vidē; •S…