Effects of season, altitude and daylength on floral initiation of two contrasting genotypes of Trifolium repens L

The effects of season and altitude on floral initiation of two Trifolium repena L. cultivars, Haifa and California Ladino, were tested in the area of Ayacucho, Peru (2730 m, 13° S), with regard to their seed production potential. Specific effects of daylength at a constant temperature (20 °C) were examined in growth chambers. In Ayacucho, the proportion of inflorescence-bearing nodes was found to be lowest between December and June (Haifa 10-20%, Ladino 0-10%) and highest in August (Haifa 30%) and September-October (Ladino 15%). Late in the cool season, floral initiation of Ladino, but not that of Haifa, increased strongly at a high altitude (3250 m). In growth chambers, Haifa initiated few inflorescences and Ladino none in a 10 h daylength. In 16 h, the floral initiation of Haifa was very limited but Ladino formed many inflorescences. Floral initiation of Haifa was most pronounced and lasted longest after a daylength shift from 10 to 13 h. It is concluded that seasonal and altitudinal variations in low temperature were the main factors influencing floral initiation in the region of Ayacucho. Haifa is considered to be an intermediate-day plant, suited for seed production in the region because of its marked and early flowering. Ladino was classified as a quantitative longday plant, unsuitable for seed production at this low latitude because of its retarded floral response to low temperatur

Procurement of IT Consulting Services and Firm-Specific Characteristics

Information technology investments and the management consulting industry witnessed unprecedented growth in the last decade. This led to regulators\u27 (SEC and Congress) allegations that consulting services that are provided by incumbent auditors may be disguised extra payments to auditors for favorable financial reporting. However, there may be alternative valid reasons for procurement of consulting. Under new legislation (proclaimed in the aftermath of spectacular failures like Enron and Worldcom), publicly traded corporations that engage professional services firms to provide both audit services and consulting services must now disclose the extent and nature of these services. Using the data made available by these new mandated disclosures and using the theoretical backdrop of the resource-based view (RBV), this paper examines whether investments by firms in consulting services follow predictable patterns driven by economic factors. Thus, rather than examine whether IT consulting has any ex-post value or whether procurement of consulting impairs auditor independence, this study focuses on whether investments, ex-ante, follow logical patterns consistent with microeconomic principles. Our analysis shows that procurement of IT and management consulting is consistent with the resource-based view -companies seek to develop organizational capabilities they lack as dictated by their strategic business need. In contrast to the narrow IT Doesn\u27t Matter view, it can be argued that even in the current environment of IT outsourcing, firms must carefully match their IT capability (in-house or outsourced) with organizational strategy and capability to develop unique and inimitable resources as put forth by RBV. We find that companies are indeed investing consistent with fundamental tenets of financial value analysis and based on market expectations of performance. More specifically, after controlling for pressure to perform and cash availability, low margin and low turnover companies spend more on consulting services. Low-margin strategy companies expend more on consulting when their asset turnover is also low, while low-turnover strategy companies expend more on consulting when their earnings margin is also low

Unanticipated Consequences of a Pandemic Flu in New York City: A Neighborhood Focus Group Study

There is fairly consistent evidence that ethnic and minority communities have historically been more vulnerable to disasters, less trusting of public authority, and often so socially marginalized that it placed them in harm’s way. In an effort to explore some of these issues we conducted a series of community-based focus groups among selected ethnic communities in order to understand how perceptions of neighborhood life during a pandemic -- and community adaptation -- might vary across the city. We conducted the focus groups in six distinct New York City neighborhoods, each meant to represent a particular ethnic sub-group: Jamaican- Americans in Wakefield, Bronx; Chinese-Americans in Chinatown; African-Americans in Bedford Stuyvesant, Brooklyn; Dominican-Americans in Washington Heights; Greek-Americans in Astoria, Queens; and South Indian-Americans in Flushing, Queens. Four of the focus groups were conducted in English, one was in Spanish, and one was in Mandarin, Chinese

Crowd-sourcing of structure-from-motion data for terrain modelling in a real-world disaster scenario:a proof of concept

Structure-from-motion (SfM) photogrammetry techniques are now widely available to generate digital terrain models (DTMs) from optical imagery, providing an alternative to costlier options such as LiDAR or satellite surveys. SfM could be a useful tool in hazard studies because its minimal cost makes it accessible even in developing regions and its speed of use can provide updated data rapidly in hazard-prone regions. Our study is designed to assess whether crowd-sourced SfM data is comparable to an industry standard LiDAR dataset, demonstrating potential real-world use of SfM if employed for disaster risk reduction purposes. Three groups with variable SfM knowledge utilized 16 different camera models, including four camera phones, to collect 1001 total photos in one hour of data collection. Datasets collected by each group were processed using VisualSFM, and the point densities, accuracies and distributions of points in the resultant point clouds (DTM skeletons) were compared. Our results show that the point clouds are resilient to inconsistency in users’ SfM knowledge: crowd-sourced data collected by a moderately informed general public yields topography results comparable in data density and accuracy to those produced with data collected by highly-informed SfM users or experts using LiDAR. This means that in a real-world scenario involving participants with a diverse range of expertise, topography models could be produced from crowd-sourced data quite rapidly and to a very high standard. This could be beneficial to disaster risk reduction as a relatively quick, simple and low-cost method to attain rapidly updated knowledge of terrain attributes, useful for the prediction and mitigation of many natural hazards

Sampling Theorem and Discrete Fourier Transform on the Riemann Sphere

Using coherent-state techniques, we prove a sampling theorem for Majorana's (holomorphic) functions on the Riemann sphere and we provide an exact reconstruction formula as a convolution product of $N$ samples and a given reconstruction kernel (a sinc-type function). We also discuss the effect of over- and under-sampling. Sample points are roots of unity, a fact which allows explicit inversion formulas for resolution and overlapping kernel operators through the theory of Circulant Matrices and Rectangular Fourier Matrices. The case of band-limited functions on the Riemann sphere, with spins up to $J$, is also considered. The connection with the standard Euler angle picture, in terms of spherical harmonics, is established through a discrete Bargmann transform.Comment: 26 latex pages. Final version published in J. Fourier Anal. App

RCRC Issue Briefs: Why Children Should Be the #1 Disaster Priority

The Resilient Children/Resilient Communities Initiative (RCRC) Issue Briefs, in this document, are designed to be used by the RCRC communities and all other communities who are seeking to elevate children’s disaster resilience to the attention of local, state, and federal legislators or other decision-makers. These reports can also be used by legislators and decision–makers at all levels of government as informative briefs to better understand the issues faced by communities in disasters within the context of COVID-19 and other disasters. Readers are encouraged to explore topics and voices that most resonate with their own community. To access an online and interactive version of RCRC Issue Briefs, please visit https://rcrctoolbox.org/rcrc-issue-briefs

Informes Temáticos RCRC: Porqué los Niños Deben Ser la Prioridad #1 en Desastres

Los Informes Temáticos RCRC, en este documento, están diseñados para ser utilizados por las comunidades de la iniciativa RCRC y todas las otras comunidades que buscan elevar la resiliencia de los niños ante desastres a la atención de legisladores locales, estatales y federales u otros responsables de la toma de decisiones. Estos informes también pueden ser utilizados por legisladores y responsables de la toma de decisiones en todos los niveles de gobierno como documentos informativos para comprender mejor los problemas que enfrentan las comunidades en desastres en el contexto de COVID-19 y otros desastres. Se anima a los lectores a explorar los temas y mensajes que más resuenan con su propia comunidad. Para acceder a una versión online e interactiva de los Informes Temáticos RCRC, visite https://rcrctoolbox.org/rcrc-issue-briefs-es/