Cooling capacity assessment of semi-closed greenhouses

Leading Dutch researchers have reported significant benefits of closed greenhouse systems. Ooteghem (2007) predicted reduced heating fuel consumption and increased crop yield. Opdam et al. (2005) found 19% primary energy use saving, 22% tomatoes production increase, 80% chemical reduction, and 50% irrigation water saving can be achieved in a closed greenhouse. This research proposes to develop a design analysis tool to determine cooling/dehumidification needs, and proper cooling capacity needed to minimize greenhouse ventilation economically for northern climate. A preliminary analysis shows it is expensive to keep greenhouses in Ohio closed year round. Further analysis suggests better return maybe achieved with semi-closed greenhouse designs instead of fully closed operation. For example, a 50% peak load design can meet cooling needs 90% of the time yearly. The proposed tool can be used to specify internal cooling capacity requirements for desired greenhouse closure level.Cooperative State Research, Education, and Extension Service of United States Department of AgricultureOhio Agricultural Research and Development Cente

Cooling capacity assessment of semi-closed greenhouses

Leading Dutch researchers have reported significant benefits of closed greenhouse systems. Ooteghem (2007) predicted reduced heating fuel consumption and increased crop yield. Opdam et al. (2005) found 19% primary energy use saving, 22% tomatoes production increase, 80% chemical reduction, and 50% irrigation water saving can be achieved in a closed greenhouse. This research proposes to develop a design analysis tool to determine cooling/dehumidification needs, and proper cooling capacity needed to minimize greenhouse ventilation economically for northern climate. A preliminary analysis shows it is expensive to keep greenhouses in Ohio closed year round. Further analysis suggests better return maybe achieved with semi-closed greenhouse designs instead of fully closed operation. For example, a 50% peak load design can meet cooling needs 90% of the time yearly. The proposed tool can be used to specify internal cooling capacity requirements for desired greenhouse closure level.Cooperative State Research, Education, and Extension Service of United States Department of AgricultureOhio Agricultural Research and Development Cente

Spin susceptibility and the pi-excitation in underdoped cuprates

The dynamical spin susceptibility chi'' at wave vector (pi, pi) and the spectrum pi'' of the spin-triplet particle--particle excitation with center of mass momentum (pi, pi) (pi-excitation) are considered in the slave-boson formulation of the t--J-model. Propagators are calculated in a diagrammatic t-matrix approximation in the d-wave superconducting state for a wide doping range. The resulting spectra chi'' and pi'' both show a resonance at a doping dependent energy, in qualitative agreement with recent numerical cluster calculations. In underdoped systems, the peak position is comparable to that found in neutron scattering experiments. The peak in chi'' as well as pi'' is at low doping entirely caused by spin fluctuations, whereas the triplet particle--particle channel does not contribute as a collective mode.Comment: 3 pages, 4 eps-figures included, uses revtex, eps

Relationship Between Emotional Intelligence and Resilience Among Newly Licensed Registered Nurses Transitioning to the Professional Role

Background: With the current nursing shortage there are fewer experienced nurses and more newly licensed registered nurses (NLRNs) in the workplace. This shortage may be due in part to inconsistencies between role expectations learned in school and the practice environment. These inconsistencies may make it challenging to transition from nursing school into professional healthcare organizations. Nurses with certain person-level traits, including resilience and emotional intelligence, may be more likely to make a successful transition into practice. Findings may improve our understanding of what person-level traits are important for making the successful transition to the workforce. Purpose: The current study explored whether emotional intelligence (EI) and resilience influenced transition into professional roles. Theoretical Framework: Understanding how cultural shock and adaptation are challenging for many NLRNs is important. Duchscher transition theory provided an overview of how NLRNs engaged in the professional practice role as they are confronted with the realities of the work environment. Methods: A non-experimental research design with descriptive cross-sectional study is used to determine if EI and resilience have any effect on NLRNs transitioning into their professional roles. Results: With a sample size of 63, there is a direct positive linear relationship between resilience and global trait EI and its subscales for NLRNs. The correlation is significant with the exception of the EI subscale emotionality. Also there was no significance with NLRNs who transitioned in a critical care setting and those in other specialty care areas. Conclusions: There is a need for further exploration of this relationship with a larger sample size and the need to investigate person-level characteristics in NLRNs who successfully transition to their professional role

Doping Dependence of the Magnetic Resonance Peak in YBa_2 Cu_3 O_{6+x}

We report inelastic neutron scattering experiments on the doping dependence of the energy and spectral weight of the sharp magnetic resonance peak in YBa_2 Cu_3 O_{6+x}. These measurements also shed light on the relationship between the magnetic excitations in the normal and superconducting states.Comment: (mostly corrections to figures and minor change to caption in Fig.5) 5 figures. It will be published in the proceedings of M2S-HTSC-V. It needs the elsevier style file (not included) to convert to postscrip