Arkansas Space Grant Consortium

Nanocrystalline hydroxyapatite (HA), Ca 10 (PO 4 ) 6 (OH) 2 , substituted with gadolinium(III) (Gd 3+ ) and neodymium(III) (Nd 3+ ) in different mole ratios (M added /Ca added = X M , 0.01, 0.05, 0.1, and 0.2), was synthesized by an ion‐exchange method. All samples had the single phase of HA except for X M =0.2, which displayed the second phase of M(OH) 3 . All were B‐type carbonated HA. The nanoparticles were elongated spheroids of around 70 nm, and the shape and size did not change significantly with an increase of X M . The M(III)‐doped HA had higher electrical conductivity compared with pure HA. A cytotoxicity test showed all were noncytotoxic except for X Gd =0.2.

大阪市北区中之島の地下鉄中之島線の建設において，駅部の工事では厚く堆積した軟弱な沖積粘土地盤の大規模な土留め掘削が行われた．都市部での施工であり，土留め壁と地盤の変形の厳正な管理が必要とされたが，無事掘削は完了した．本論文では，軟弱地盤大規模掘削時の土留め壁変形メカニズムを研究するため，弾粘塑性構成式による水－土連成有限要素法を用いた事後解析を行い，計測結果との比較から土留め壁の変形挙動を詳細に検討した．その結果，土留め壁根入れ部下端を固定点と仮定した土留め壁水平変位計測結果は，切梁軸力計測結果と矛盾しており，根入れ部の変位を計測に考慮する必要がある事を明らかにした．また，根入れ部の変位を考慮すれば，解析結果は土留め壁の変形モードを良く再現している．


 
 
 O texto apresenta uma experiência de pesquisa–ação realizada por pesquisadores da Universidade Federal de Campina Grande em parceria com o Sindicato dos Trabalhadores Rurais de Lagoa Seca — PB, com a ONG AS-PTA, e com o CIRAD, visando fazer, a partir de uma metodologia participativa, um diagnóstico do impacto das políticas públicas sobre a agricultura familiar, no intuito de valorizar experiências de desenvolvimento local. Partindo disso, objetivamos propor recomendações de políticas de desenvolvimento territorial mais adaptadas às aspirações dos agricultores. O artigo resgata essa experiência, analisando a metodologia de pesquisa e seus resultados, e sugerindo recomendações para as políticas de desenvolvimento rural.
 
 

This study investigates the extent to which primary school headteachers are able to utilise mechanisms such as the Every Child Matters (ECM) agenda in order to further the cause of leadership succession planning.Headteachers of five primary schools deemed strong in leadership succession planning, from four local authorities, were interviewed and their views triangulated with members of staff, past or present, who had engaged with leadership succession issues and where possible had also had responsibility for delivery of an aspect of ECM.Wider local authority representative views were also sought.Although small, the cross-sectional nature of the sample nevertheless allows generalised conclusions to be drawn.Findings show that approaches to succession planning vary along a continuum, with school interests at one end and systemic needs at the other.Schools that are most effective are able to maintain a balance between the two.Effective schools make wide use of initiatives such as ECM as a mechanism for leadership development for identified potential leaders, irrespective of their present formal leadership role.

Mesoscale convective systems (MCSs) are an important component of our hydrologic cycle as they produce prolific rainfall in the tropics and mid-latitudes. Recent advancements in high-resolution modeling show promise in representing MCSs in regional climate simulations. However, how well do these models represent the complex interactions between convective dynamics and microphysics in MCSs remain unknown. In this study, we take advantage of observations collected during the Midlatitude Continental Convective Cloud (MC3E) experiment to evaluate multi-scale aspects of MCSs in convection-permitting WRF model. We conducted three sets of month-long simulations with Morrison and P3 (1-ice and 2-ice categories) microphysics, respectively, at 1.8 km grid-spacing over the Southern Great Plains. MCSs in observations and simulations were tracked using a newly developed FLEXTRKR algorithm. About 15-20 MCSs were identified in the simulations, consistent with observations. All three simulations underestimate observed monthly total precipitation which are primarily from MCSs, suggesting the biases might be caused by large-scale forcings rather than microphysics. All simulated MCSs overestimate convective area and precipitation amount but underestimate stratiform rain area and precipitation. Simulated MCS convective updraft intensities are comparable with radar retrievals for moderate depths of convective cores, but are too strong for deep cores. The two P3 simulations have smaller mean ice mass aloft but more frequent heavy convective rain rate at the surface than the simulation with Morrison, agreeing better with observations (Figure 1). Simulated stratiform area ice mass in the upper troposphere are generally larger than radar retrievals, but the P3 2-ice category has relatively smaller bias. We will also use polarimetric radar 3-D rain water retrieval to further evaluate the vertical evolution of rainfall to explain differences in simulated surface precipitation.

Фотометрия и моделирование сверхновой звезды IIb типа СН 2017gpn - Institutional repository of Federal State Autonomous Educational Institution of Higher Professional Education Ural Federal University named after the first President of Russia B.N.Yeltsin