Inversion of satellite magnetic anomaly data

A method of finding a first approximation to a crustal magnetization distribution from inversion of satellite magnetic anomaly data is described. Magnetization is expressed as a Fourier series in a segment of spherical shell. Input to this procedure is an equivalent source representation of the observed anomaly field. Instability of the inversion occurs when high frequency noise is present in the input data, or when the series is carried to an excessively high wave number. Preliminary results are given for the United States and adjacent areas.           ARK: https://n2t.net/ark:/88439/y090977 Permalink: https://geophysicsjournal.com/article/159 &nbsp

Testing predictions of small brood models using parasitoid wasps

Question: How is variation in offspring size (between broods) related to brood size? Hypotheses: Variance in offspring size (between broods) should decrease with increasing brood size as predicted by Charnov and colleagues' (Charnov and Downhower, 1995; Charnov et al., 1995) small brood invariant. The range in resources put towards reproduction (for mothers producing a certain brood size) should be invariant over brood size (Downhower and Charnov, 1998). We also test assumptions underlying these predictions. Data studied: We use previously collected data on six parasitoid wasp species. Conclusions: As predicted, variance in offspring size among broods decreased with increasing brood size. However, this decrease did not follow closely the quantitative predictions of Charnov and colleagues (Charnov and Downhower, 1995; Charnov et al., 1995). We found some support for the prediction that the range in resources invested in reproduction is invariant over brood size. The assumption that mean offspring size is constant over brood size was violated in three of six species. The assumpt [KEYWORDS: brood size ; litter size ; parasitoid wasps ; resource allocation ; trade-off OPTIMAL OFFSPRING SIZE ; CLUTCH-SIZE ; SEX-CHANGE ; BODY-SIZE ; HYMENOPTERA ; EVOLUTION ; FITNESS ; FIELD ; INVARIANTS ; EULOPHIDAE]

Testing predictions of small brood models using parasitoid wasps

Question: How is variation in offspring size (between broods) related to brood size? Hypotheses: Variance in offspring size (between broods) should decrease with increasing brood size as predicted by Charnov and colleagues' (Charnov and Downhower, 1995; Charnov et al., 1995) small brood invariant. The range in resources put towards reproduction (for mothers producing a certain brood size) should be invariant over brood size (Downhower and Charnov, 1998). We also test assumptions underlying these predictions. Data studied: We use previously collected data on six parasitoid wasp species. Conclusions: As predicted, variance in offspring size among broods decreased with increasing brood size. However, this decrease did not follow closely the quantitative predictions of Charnov and colleagues (Charnov and Downhower, 1995; Charnov et al., 1995). We found some support for the prediction that the range in resources invested in reproduction is invariant over brood size. The assumption that mean offspring size is constant over brood size was violated in three of six species. The assumpt [KEYWORDS: brood size ; litter size ; parasitoid wasps ; resource allocation ; trade-off OPTIMAL OFFSPRING SIZE ; CLUTCH-SIZE ; SEX-CHANGE ; BODY-SIZE ; HYMENOPTERA ; EVOLUTION ; FITNESS ; FIELD ; INVARIANTS ; EULOPHIDAE

The experience of outsourcing transfer: implications for guidance and counselling

Outsourcing can involve the forced transfer of employees to another organisation. During or after the transfer they may find their jobs have changed or go through a process of downsizing. They also often have to maintain a relationship with their previous employer as they continue to work on joint projects. In this paper we review relevant research literature and identify important psychological and organisational processes involved in this process, which are of specific interest to guidance and counselling. We also present data from a longitudinal research study in which employees undergoing an outsourcing transfer discussed their experiences. A number of these employees required career counselling and some were undergoing psychological counselling to reduce depression and anxiety. In conclusion, we summarise important issues to be considered by the counsellor when advising individuals going through this process