Evaluation of Egg Frequency Distributions in the Pea-aphid Parasite Aphidius smithi (Hymenoptera: Aphidiidae) by Pattern Analysis

1987 ◽  
Vol 80 (1) ◽  
pp. 1-8 ◽  
Author(s):  
S. Kambhampati ◽  
M. Mackauer ◽  
J. P. Panno
Keyword(s):  
Pattern Analysis ◽  
Pea Aphid ◽  
Frequency Distributions ◽  
Aphid Parasite

scholarly journals Searching for histogram patterns in USD/ZAR foreign exchange financial time series

2009 ◽  
Vol 6 (4) ◽  
pp. 575-584
Author(s):  
JH Van Rooyen
Keyword(s):  
Time Series ◽  
Exchange Rate ◽  
High Frequency ◽  
Financial Risk ◽  
Pattern Analysis ◽  
Financial Time Series ◽  
Rate Data ◽  
Data Set ◽  
Frequency Distributions ◽  
Financial Time

This study aims to investigate whether the phenomena found by Shnoll et al. when applying histogram pattern analysis techniques to stochastic processes from chemistry and physics are also present in financial time series, particularly exchange rate data. The phenomena are related to fine structure of non-smoothed frequency distributions drawn from tick high frequency currency exchange rates over a period of one week. Shnoll et al. use the notion of macroscopic fluctuations (MF) to explain the behaviour of sequences of histograms. Histogram patterns in time adhere to several laws that could not be detected when using time series analysis methods. In this study, which is a follow up of research by Van ZylBulitta, VH, Otte, R and Van Rooyen, JH, special emphasis is placed on the histogram pattern analysis of high frequency exchange rate data set. Following previous studies of the Shnoll phenomena from other fields, different steps of the histogram sequence analysis are carried out to determine whether the findings of Shnoll et al. could also be applied to financial market data. The findings presented here widen the understanding of time varying volatility and can aid in financial risk measurement and management. Outcomes of the study include an investigation of time series characteristics, more specifically the formation of discrete states and the repetition of histogram patterns

THE LARVAL INSTARS OF APHIDIUS SMITHI (HYMENOPTERA: APHIDIIDAE)

1979 ◽  
Vol 111 (5) ◽  
pp. 631-634 ◽  
Author(s):  
R. J. Chorney ◽  
M. Mackauer
Keyword(s):  
Electron Micrographs ◽  
Ventral Side ◽  
Pea Aphid ◽  
Scanning Electron Micrographs ◽  
Diagnostic Features ◽  
Larval Instars ◽  
The Third ◽  
Aphid Parasite ◽  
Feeding Structure ◽  
Scanning Electron

AbstractThe pea aphid parasite Aphidius smithi Sharma & Subba Rao has four larval instars. The first and the fourth instars are mandibulate. The second instar possesses oral lobes but not mandibles. A bilobed feeding structure on the ventral side of the head of the third instar could function as a pharyngeal pump. The chief diagnostic features of each instar are illustrated with scanning electron micrographs. Variability in the number of larval instars among species of Aphidiidae is discussed.

scholarly journals Layer histogram patterns in financial time series

2009 ◽  
Vol 6 (3) ◽  
pp. 137-146
Author(s):  
Verena Helen Van Zyl-Bulitta ◽  
R. Otte ◽  
JH Van Rooyen
Keyword(s):  
Time Series ◽  
Exchange Rate ◽  
Financial Risk ◽  
Pattern Analysis ◽  
Financial Time Series ◽  
Data Set ◽  
Frequency Distributions ◽  
Analysis Techniques ◽  
Financial Time ◽  
Macroscopic Fluctuations

This study aims to investigate whether the phenomena found by Shnoll et al. when applying histogram pattern analysis techniques to stochastic processes from chemistry and physics are also present in financial time series, particularly exchange rate and index data. The phenomena are related to fine structure of non-smoothed frequency distributions drawn from statistically insufficient samples of changes and their patterns in time. Shnoll et al. use the notion of macroscopic fluctuations (MF) to explain the behavior of sequences of histograms. Histogram patterns in time adhere to several laws that could not be detected when using time series analysis methods. In this study special emphasis is placed on the histogram pattern analysis of high frequency exchange rate data set. Following previous studies of the Shnoll phenomena from other fields, different steps of the histogram sequence analysis are carried out to determine whether the findings of Shnoll et al. could also be applied to financial market data. The findings presented here widen the understanding of time varying volatility and can aid in financial risk measurement and management. Outcomes of the study include an investigation of time series characteristics, more specifically the formation of discrete states.

FECUNDITY AND HOST UTILIZATION OF THE APHID PARASITE APHELINUS SEMIFLAVUS (HYMENOPTERA: APHELINIDAE) AT TWO HOST DENSITIES

1982 ◽  
Vol 114 (8) ◽  
pp. 721-726 ◽  
Author(s):  
Manfred Mackauer
Keyword(s):  
Host Density ◽  
Egg Laying ◽  
Oviposition Rate ◽  
Pea Aphid ◽  
Reproductive Age ◽  
Total Fecundity ◽  
Aphid Parasite ◽  
The Mean ◽  
Host Utilization

AbstractThe longevity, fecundity, and oviposition rates of Aphelinus semiflavus Howard were determined at densities of 20 and 60 pea aphid hosts per day. Host density had no significant effect on parasite longevity and total fecundity, but it did influence the mean daily oviposition rate (16.5 and 19.5 aphids/day at density 20 and 60, respectively) and the overall proportion of aphids parasitized (82.3% and 32.5%, respectively) during the period of maximum egg laying. The implications of a shift in the fecundity schedule to an earlier reproductive age are discussed.

THE PEA APHID PARASITE APHIDIUS SMITHI (HYMENOPTERA: BRACONIDAE), FOUND IN ALBERTA

1976 ◽  
Vol 108 (11) ◽  
pp. 1296-1296 ◽  
Author(s):  
A. M. Harper
Keyword(s):  
United States ◽  
British Columbia ◽  
North America ◽  
Gulf Coast ◽  
The United States ◽  
Pea Aphid ◽  
Western Canada ◽  
Canadian Prairies ◽  
Aphid Parasite ◽  
Important Parasite

Aphidius smithi Sharma and Subba Rao is the most important parasite of the pea aphid, Acyrthosiphum pisum (Harris), in North America. In 1958, it was imported into the United States from India to control the pea aphid and was subsequently released and recovered in most of continental United States except the Gulf Coast States and Texas (Halfhill et al. 1972). Mackauer and Finlayson (1967) reported that the parasite was present in Ontario, Quebec, and British Columbia and had been released but not recovered in Nova Scotia. A. smithi has never been released in western Canada nor been found on the Canadian prairies before 1970.

Automated Image Analysis Of Nuclear And Cytoplasmic Changes In Exfoliated Cells From Tracheas Treated With Carcinogen

1977 ◽  
Vol 35 ◽  
pp. 220-221
Author(s):  
S.F. Stinson ◽  
J.C. Lilga ◽  
M.B. Sporn
Keyword(s):  
Image Analysis ◽  
Pattern Analysis ◽  
Relative Proportion ◽  
Automated Image Analysis ◽  
Image Analyzer ◽  
Cross Sectional ◽  
Exfoliated Cells ◽  
Neoplastic Lesions ◽  
Analysis System ◽  
Morphologic Criterion

Increased nuclear size, resulting in an increase in the relative proportion of nuclear to cytoplasmic sizes, is an important morphologic criterion for the evaluation of neoplastic and pre-neoplastic cells. This paper describes investigations into the suitability of automated image analysis for quantitating changes in nuclear and cytoplasmic cross-sectional areas in exfoliated cells from tracheas treated with carcinogen.Neoplastic and pre-neoplastic lesions were induced in the tracheas of Syrian hamsters with the carcinogen N-methyl-N-nitrosourea. Cytology samples were collected intra-tracheally with a specially designed catheter (1) and stained by a modified Papanicolaou technique. Three cytology specimens were selected from animals with normal tracheas, 3 from animals with dysplastic changes, and 3 from animals with epidermoid carcinoma. One hundred randomly selected cells on each slide were analyzed with a Bausch and Lomb Pattern Analysis System automated image analyzer.

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