Combining internal and external inputs for sustainable intensification

Farmers and local development organizations around the world use and promote a variety of technologies to increase food production. But the high cost of inorganic fertilizers and other agrochemicals often drives farmers to rely on locally available resources instead of purchased, externally produced inputs. So-called low external input agriculture (LEIA) has spread rapidly to different parts of the globe as a challenging alternative to—or, more frequently, a complement to— Green Revolution technologies...The goal of policy, research, and extension should be to help LEIA farmers achieve "sustainable intensification", which refers to the simultaneous increase in returns to land and labor (in the short run) and the maintenance of soil nutrient balances (in the long run).Soil fertility. ,Food production. ,Technological innovations. ,Fertilizers. ,Agricultural research. ,

A Socio-economic Analysis of Youth Disconnectedness

Disconnectedness among youth can have several dimensions. From a socio-economic viewpoint, failure in school, unemployment and the lack of an intimate relationship are among the most important ones. In our samples from SOEP youth questionnaires, approximately 13% of young people in Germany between the ages of 17 and 19 are disconnected. The percentage of disconnected youths has been on the rise since 2001. There is evidence that an adverse family background is the most important variable for being disconnected in young adulthood. Macroeconomic factors also contribute to disconnectedness. Recessions are followed by increases in the number of disconnected youth.disconnected youth, unemployment, school failure, life adversity

A socio-economic analysis of youth disconnectedness

According to our research, some 12% of young people in Germany between the ages of 17 and 19 are disconnected, i.e. not in school, unemployed, and not living with a partner. The percentage of disconnected youths has been on the rise since 2002. There is evidence that an adverse family environment is the most important variable for being disconnected. Early life adversity influences the development of cognitive and noncognitive skills as well as school and labour market outcomes. Macroeconomic factors also contribute to disconnectedness. Recessions are followed by an increase in the number of disconnected youth. --Disconnected youth,unemployment,school failure,life adversity

A Socio-Economic Analysis of Youth Disconnectedness

Disconnectedness among youth can have several dimensions. From a socio-economic viewpoint, failure in school, unemployment and the lack of an intimate relationship are among the most important ones. In our samples from SOEP youth questionnaires, approximately 13% of young people in Germany between the ages of 17 and 19 are disconnected. The percentage of disconnected youths has been on the rise since 2001. There is evidence that an adverse family background is the most important variable for being disconnected in young adulthood. Macroeconomic factors also contribute to disconnectedness. Recessions are followed by increases in the number of disconnected youth.Disconnected youth, unemployment, school failure, life adversity

Soil and crop responses following application of biosolids-derived organomineral fertilisers to ryegrass (Lolium perenne L.) grown in pots

Biosolids-derived organomineral fertilisers (OMF) were produced using a novel technique reported in earlier studies. This technique enables addition of N and potash to biosolids granules to form a balanced NPK fertiliser. Two fertiliser products; OMF10 (10:4:4) and OMF15 (15:4:4), were formulated and tested in a glasshouse facility on pot-grown ryegrass in comparison with urea and biosolids granules at N application rates ranging from 0 to 300 kg ha-1. The aim of this research was to contribute to the understanding of nutrients management and dynamics in grass crops fertilised with OMF. The study focused upon dry matter yield (DMY) and crop responses to applied fertiliser, nitrogen use efficiency (NUE) and fertilisers’ effect on soil fertility. Results indicated that ryegrass responds linearly to application of OMF increasing DMY by about 2% to 27% compared with biosolids but to a lesser extent than urea (range: 17% to 55%). NUE was related to the concentration of readily available N in the fertiliser; urea and OMF showed significantly greater (P<0.05) N recoveries than biosolids (26% to 75%, and 19% to 29%, respectively). Total nitrogen in soil and SOM increased (P<0.05) depending on the concentration of organic-N in the fertiliser applied. DMY was lower but more sustained overtime in biosolids-treated pots. OMF application did not result in significant changes in soil extractable-P levels whereas for urea, it decreased significantly while it showed a significant increase in biosolids-treated pots, where soil-P Index changed from 5 to 6. In OMF-treated soil, soil P Index remained close to constant overtime thereby supporting the purpose of the formulations tested

Active particle dynamics beyond the jamming density

Many biological systems form colonies at high density. Passive granular systems will be jammed at such densities, yet for the survival of biological systems it is crucial that they are dynamic. We construct a phase diagram for a system of active particles interacting via Vicsek alignment, and vary the density, self-propulsion force, and orientational noise. We find that the system exhibits four different phases, characterized by transitions in the effective diffusion constant and in the orientational order parameter. Our simulations show that there exists an optimal noise such that particles require a minimal force to unjam, allowing for rearrangements.Comment: 7 pages, 8 figure

Advanced nozzle and engine components test facility

A test facility for conducting scaled advanced nozzle and engine component research is described. The CE-22 test facility, located in the Engine Research Building of the NASA Lewis Research Center, contains many systems for the economical testing of advanced scale-model nozzles and engine components. The combustion air and altitude exhaust systems are described. Combustion air can be supplied to a model up to 40 psig for primary air flow, and 40, 125, and 450 psig for secondary air flow. Altitude exhaust can be simulated up to 48,000 ft, or the exhaust can be atmospheric. Descriptions of the multiaxis thrust stand, a color schlieren flow visualization system used for qualitative flow analysis, a labyrinth flow measurement system, a data acquisition system, and auxiliary systems are discussed. Model recommended design information and temperature and pressure instrumentation recommendations are included

On marginal deformation of WZNW model and PP-wave limit of deformed AdS3×S3AdS_{3}\times S^{3} string geometry

We discuss the Penrose limit of the classical string geometry obtained from a truly marginal deformation of $SL(2)\otimes SU(2)$ WZNW model.Comment: 10 pages, late