Spelling suggestions: "subject:" classification"" "subject:" 1classification""
271 |
Systematics of Niteobrachis, a new genus in the tribe Brachistini (Hymenoptera:Braconidae:Helconinae)Aranguren, Antonio M. January 1999 (has links)
Niteobrachis, a new genus in the tribe Brachistini (Hymenoptera: Braconidae: Helconinae), is described. The genus is endemic to the New World and contains 24 species, all of which are newly described: amazonicus, attonitus, candeo, carmenae, clarus, delicatus, elegans, fulgeo, gracilis, gustus, ictus, insignis (type species), luceo, lucidus, luisi, lumen, luminosus, luna, mico, nitidus, serenus, splendidus, subtilis and venustus. Keys to the species of Niteobrachis and to the genera of Brachistini are given. Niteobrachis is diagnosed by a combination of characters in the metasoma, including the absence of striations and/or sculpturing on the second and third median tergites with a glossy/smooth appearance; a shallow suture between the second and third median tergites; presence of a crease that separates the second median tergite from the second laterotergite; absence of a crease that separates the third median tergite from the third laterotergite; fused second and third laterotergites; the lateral longitudinal carinae of the first median tergite reaching the articulation between the first and second median tergites; and the first three median tergites covering most of the remainder of the metasoma. The monophyly of Niteobrachis is supported by two synapomorphies: a minute median longitudinal carina of the propodeum, and the lateral longitudinal carinae of the first median tergite reaching the articulation between the first and second median tergites. Recognition of this genus resulted from a phylogenetic analysis of six tribes of Helconinae, including most genera of Brachistini based on a data matrix of 49 characters and 18 terminal taxa. The phylogenetic affinities of the genus are examined, a sister group relationship with Foersteria Szepligeti is hypothesized, and the problematic placement of the subgenera of Eubazus Nees is considered.
|
272 |
Acoustical analysis of respiratory sounds for detection of obstructive sleep apneaMontazeripouragha, Amanallah 16 March 2012 (has links)
Obstructive Sleep Apnea (OSA) is a common respiratory disorder during sleep. Apnea
is cessation of airflow to the lungs, which lasts for at least 10 seconds accompanied by
more than 4% drop of the blood's Oxygen saturation. Polysomnography during the entire
night is the Gold Standard diagnostic method of OSA. It's high cost and inconvenience
for patients persuaded researchers to seek alternative OSA detection methods.
This thesis proposes a technique for assessment of OSA during wakefulness. We recorded tracheal breath sounds of 17 non-apneic individuals and 35 people with various degrees of OSA severity in supine and upright positions during nose and mouth breathing at medium flow rate. We calculated the power spectrum, Kurtosis, and Katz fractal dimensions of the recorded signals. Then, we reduced the number of characteristic features to two.
We classified the participant into severe OSA and non-OSA groups as well as non-OSA
or mild vs. moderate and severe OSA groups. The results showed more than 91 and 83%
accuracy; for the two types of classification. Once veri ed on a larger population, the proposed method may be used as a simple and non-invasive screening tool for assessment of OSA during wakefulness.
|
273 |
Relationships between synoptic circulation patterns and freezing rain in Churchill, Manitoba (1953-2009)Smith, Ryan Peter Roy 03 October 2012 (has links)
Freezing rain is an especially hazardous type of adverse weather and is frequently observed in Churchill, Manitoba. The goals of this study were to assess the climatology of freezing rain in Churchill, assess the synoptic climatology of the Hudson Bay region using a multi-level synoptic classification scheme, assess the relationships between the synoptic climate and freezing rain events, and assess the trends in synoptic types and to discuss the implications of climate change in relation to the expected changes in freezing rain. For the years 1953 thru 2009, freezing rain was observed during 796 hours, an average of approximately 15 hours per year. A 34-type multi-level synoptic classification consisting of five NCEP/NCAR reanalysis datasets was constructed. Type-20 was associated with a majority of the freezing rain cases. More research is needed to understand how climate change may impact the timing, frequency and intensity of freezing rain in Churchill.
|
274 |
Phylogenetic study of Apocrita (Hymenoptera) with emphasis on wing venationRoy, Alain, 1968 May 11- January 1995 (has links)
A phylogenetic character analysis of the wing venation within Apocrita (Hymenoptera) was conducted in order to examine the phylogenetic significance of wing characters. The venational data were then combined with published studies of other character suites to produce a hypothesis of phylogenetic relationships among apocritan superfamilies and families. Whereas the cladograms obtained from the collection of papers on character suites provide strong support for the sister group relationship between Orussidae and Apocrita, the ones derived from wing venation did not establish such a relationship, although they provided more support for relationships within Apocrita. A ground plan is proposed for the wing venation of each taxon examined; for Apocrita, it is close to the groundplan established for Aculeata. The variability of wing venation is higher between and within apocritan taxa than in Symphyta. This research confirms that groupings such as the Symphyta, Siricoidea, Evanioidea and possibly the Proctorupoidea are artificial.
|
275 |
Systematics and phylogeny of the Dolichopodinae (Diptera:Dolichopodidae)Brooks, Scott Edward January 2004 (has links)
The phylogenetic relationships of the subfamily Dolichopodinae were investigated based on the examination of over 340 species from all zoogeographic regions. Sixty-five exemplar species were included in cladistic analysis based on 74 morphological characters of adult specimens. Twenty genera are recognized in the Dolichopodinae: Allohercostomus Yang, Saigusa and Masunaga, Anasyntormon Parent, Argyrochlamys Lamb, Cheiromyia Dyte, Dolichopus Latreille, Ethiromyia gen. nov., Gymnopternus Loew, Hercostomus Loew, Metaparaclius Becker, Muscidideicus Becker, Ortochile Latreille, Paraclius Loew, Parahercostomus Yang, Saigusa and Masunaga, Pelastoneurus Loew, Platyopsis Parent, Poecilobothrus Mik, Prohercostomus Grichanov, Stenopygium Becker, Sybistroma Meigen, and Tachytrechus Stannius. Eleven genera are newly synonymized: Halaiba Parent (= Argyrochlamys Lamb); Lichtwardtia Enderlein (= Dolichopus Latreille); Phalacrosoma Becker (= Hercostomus Loew); Steleopyga Grootaert and Meuffels (= Hercostomus Loew); Proarchus Aldrich (= Pelastoneurus Loew); Sarcionus Aldrich (= Pelastoneurus Loew); Pterostylus Mik (= Poecilobothrus Mik); Ludovicius Rondani (= Sybistroma Meigen); Nodicornis Rondani (= Sybistroma Meigen); Gonioneurum Becker (= Tachytrechus Stannius); Syntomoneurum Becker (= Tachytrechus Stannius). Eighty-one new generic combinations are established and one new name is proposed for a secondary homonym. Four genera that were sometimes included in the subfamily are excluded, namely Colobocerus Parent, Katangaia Parent, Pseudohercostomus Stackelberg and Vetimicrotes Dyte. A key to the world genera of Dolichopodinae is provided. The Tachytrechus alatus species group (formerly the genus Syntomoneurum) is revised. This species group includes five Neotropical species, all of which are redescribed. A key to the species of the T. alatus species group is provided. The new genus Ethiromyia is also described, including two Nearctic and one Palaearctic spec
|
276 |
Moisture regimes, redoz/podzolic characteristics and profile morphology of stagnopodzols, stagnohumic gley soils and their reclaimed counterparts on ExmoorMcHugh, Maureen January 1989 (has links)
No description available.
|
277 |
A revision of the genus Scleria Bergius (Cyperaceae) in Southern Africa.Franklin, Esme Frances. January 1983 (has links)
The genus Scleria Bergius (Cyperaceae) in Southern
Africa is critically examined, and the generic limits reviewed
The taxonomic position of the genus in the family is
examined. Diagnosis of the tribe Sclerieae is altered to
circumscribe Scleria as the only genus, and diagnoses of
the tribes Bisboeckelereae and Sclerieae are made.
Infrageneric limits are re-assessed and two subgenera,
Scleria and Hypoporum recognised, the relationship of
which is postulated as co-lateral, not filial. Evidence
is presented that ecological specialisation in subgenus
Hypoporum has resulted in taxa which are adapted to open,
seasonally dry, temperate habitats, whereas ecological
specialisation in subgenus Scleria has given rise to taxa
which are adapted to shady, wet, tropical and subtropical
habitats. Taxa in subgenus Hypoporum are slender, usually
narrow-leaved annuals, or perennials with annual aerial
parts, that is, they have evolved drought/cold escape
mechanisms, the annuals by completion of the life cycle
in a season, the perennials by withdrawal of food reserves
into a protected, subterranean perennating organ and
sometimes also into enlarged culm-bases. Taxa in subgenus
Scleria are more-or-less robust, usually broad-leaved
perennials, or, less often, annuals. With few exceptions
the plants are evergreen and do not manifest drought/cold
escape mechanisms. The annual species occupy tropical
habitats in areas where seasonal drought may be
experienced and it is suggested that they have acquired the annual habit as a drought-escape mechanism. The only
perennial species in subgenus Scleria in Southern Africa
which has annual aerial parts, has evolved additional
storage regioni in the swollen culm-bases. This species,
S. transvaalensis occurs at higher, more temperate
altitudes than other species in the subgenus.
The fundamental branching pattern of the inflorescence
of all species examined has been shown to be the same. It
is postulated that the pattern is modified in two ways,
namely, by progressive contraction of all or most ramuli
leading to the "glomerate-spicate" type of inflorescence
characteristic of subgenus Hypoporum, in which the bracts
are reduced, glumiform structures, and, by progressive
contraction of some ramuli and progressive elongation of
others leading to the "interrupted-paniculate" type of
inflorescence characteristic of subgenus Scleria, in
which the bracts are foliaceous. It is suggested that the
branched glomerate-spicate type of inflorescence is less
specialised than the simply glomerate-spicate
type, and that in the line with interrupted-paniculate
inflorescences, the greater the degree of elongation and
the greater the number of elongated ramuli, the more
highly specialised the inflorescence.
Evidence is put forward that the spikelet of Scleria
is a monopodial, that is, racemosely-branched structure,
and suggestions that it may be sympodial, refuted. It is postulated that unisexual spikelets in Scleria
have been derived by reduction from bisexual (androgynaeceous)
spikelets. Unisexual female spikelets are unknown in
subgenus Hypoporum which has androgynaeceous spikelets and
unisexual male spikelets. It is suggested that the higher
the ratio of androgynaeceous to male spikelets in the
inflorescence, the less specialised the inflorescence.
Unisexual male and functionally unisexual female
spikelets occur in subgenus Scleria and, rarely,
androgynaeceous spikelets. It is suggested that species
which consistently produce some androgynaeceous spikelets
are more primitive than those which consistently lack
them, and that species whose functionally female spikelets
consistently lack any vestigial male parts are more
advanced than those which have male rudiments.
The hypogynium or "disc" which is present on some
achenes is considered to be a new modification of the
stipe of the achene and not a vestigial structure,
therefore it is postulated that the type of achene
found in subgenus Hypoporum which has a trigonous stipe
lacking any distal elaboration as an hypogynium is
primitive, and that the type of achene found in subgenus
Scleria which has an obpyramidal stipe elaborated distally
as an hypogynium is derivative. It is suggested that
development of the hypogynium has attained its most
specialised level in one group of species in which this
structure serves as a flotation device. Diagnoses of sections in subgenus Scleria are based partly on differences
in morphology of the hypogynium.
It has been demonstrated that the cell-walls of the
pericarp are silicified, that the process of silification
is progressive proceeding from the apex towards the base
of the fruit, and that abscission of the fruit takes
place when silicification is complete and the vascular
supply is severed. The achenes of subgenus Hypoporum have
all cells silicified; those of subgenus Scleria have all
cells except those of the free flange(s) of the hypogynium
silicified.
Scanning electron microscopy has revealed details of
surface ornamentation of the achenes not previously known,
which provide additional diagnostic characters at species
level.
Attemptsto germinate achenes of Scleria have been
unsuccessful : the conditions required, physical and
physiological, are not understood.
Analysis of anatomical evidence, in particular those
characters seen in transverse sections of laminas and
culms, confirms that there has been specialisation along
two divergent pathways; one which has led to successful
occupation of relatively dry, temperate habitats
(subgenus Hypoporum), and the other to successful
occupation of shaded damp, and open aquatic, subtropical and tropical habitats (subgenus Scleria).
One section, Hypoporum, is recognised in subgenus
Hypoporum, pending survey of the subgenus on a world basis.
Four sections are recognised in subgenus Scleria,
namely, Scleria, Acriulus, Schizolepis and Ophryoscleria.
Section Scleria may comprise several natural groups, the
delimitations of which can not be attempted until a world
survey has been made.
A map showing world distribution of the genus, and
regional distribution maps of Southern African species
are provided, also a Table showing the total distribution
range of species recorded from Southern Africa.
Generic, subgeneric, sectional and species
descriptions are provided. Two new species are described.
Keys to the Southern African species for use in the
herbarium, in the field, and one based on anatomical
characters of the laminas are presented. Original
descriptions and photographs of type specimens of taxa
represented in Southern Africa are included as appendices. / Thesis (Ph.D.)-University of Natal, Pietermaritzburg, 1983.
|
278 |
A biosystematic study of selected members of the genus Crataegus employing electrophoretic techniquesMorse, Mary Ann January 1983 (has links)
Polyacrylamide gel electrophoresis was employed in an investigation of peroxidase isozymes extracted from the mature fruits of seventeen individuals belonging to the genusThe purpose of this study was to develop procedures which could supplement existing information contributing to the biosystematics of this genus.Samples were detected on 5%-20% linear gradient gels in a sodium borate - boric acid buffer (pH, 9.0). Following electrophoresis, incubation was carried out in a solution containing benzidine dihydrochioride and hydrogen peroxide in an acetate buffer (pH, 4.5).Resulting zymograms were analyzed and eight different isozyme bands identified, based on width, staining characteristics and relationship to a horseradish peroxidase standard zymogram. Composite zymograms were drawn for each Species, based on frequency of occurrence of individual bands. Within each species, some isozymes were observed in 100% of the individuals, while other bands appeared in 20% to 92% of the gels examined. Three of the seven species investigated exhibited unique zymograms. Similarities were noted in isozyme patterns among species. Three groups of species were established based on the presence or absence of certain variable bands. Two of these groups had some correspondence to series groupings based on observable morphological characteristics. A third group consisted of species not related in traditional classification.
|
279 |
Improved Multi-resolution Analysis of the Motion Patterns in Video for Human Action ClassificationShabani, Hossein January 2011 (has links)
The automatic recognition of human actions in video is of great interest in many applications
such as automated surveillance, content-based video summarization, video search, and indexing.
The problem is challenging due to a wide range of variations among the motion pattern of a given
action such as walking across different subjects and the low variations among similar motions
such as running and jogging.
This thesis has three contributions in a discriminative bottom-up framework to improve the
multi-resolution analysis of the motion patterns in video for better recognition of human actions.
The first contribution of this thesis is the introduction of a novel approach for a robust local
motion feature detection in video. To this end, four different multi-resolution temporally
causal and asymmetric filters of log Gaussian, scale-derivative Gaussian, Poisson, and asymmetric
sinc are introduced. The performance of these filters is compared with the widely used
multi-resolution Gabor filter in a common framework for detection of local salient motions. The
features obtained from the asymmetric filtering are more precise and more robust under geometric
deformations such as view change or affine transformations. Moreover, they provide higher
classification accuracy when they are used with a standard bag-of-words representation of actions
and a single discriminative classifier. The experimental results show that the asymmetric
sinc performs the best. The Poisson and the scale-derivative Gaussian perform better than log
Gaussian and that better than the symmetric temporal Gabor filter.
The second contribution of this thesis is the introduction of an efficient action representation.
The observation is that the salient features at different spatial and temporal scales characterize
different motion information. A multi-resolution analysis of the motion characteristic should be
representative of different actions. A multi-resolution action signature provides a more discriminative
video representation.
The third contribution of this thesis is on the classification of different human actions. To this
end, an ensemble of classifiers in a multiple classifier systems (MCS) framework with a parallel
topology is utilized. This framework can fully benefit from the multi-resolution characteristics
of the motion patterns in the human actions. The classification combination concept of the MCS
has been then extended to address two problems in the configuration setting of a recognition
framework, namely the choice of distance metric for comparing the action representations and
the size of the codebook by which an action is represented. This implication of MCS at multiple
stages of the recognition pipeline provides a multi-stage MCS framework which outperforms the
existing methods which use a single classifier.
Based on the experimental results of the local feature detection and the action classification,
the multi-stage MCS framework, which uses the multi-scale features obtained from the temporal
asymmetric sinc filtering, is recommended for the task of human action recognition in video.
|
280 |
An Image Processing and Pattern Analysis Approach for Food RecognitionPouladzadeh, Parisa 21 January 2013 (has links)
As people across the globe are becoming more interested in watching their weight, eating more healthily, and avoiding obesity, a system that can measure calories and nutrition in everyday meals can be very useful. Recently, there has been an increase in the usage of personal mobile technology such as smartphones or tablets, which users carry with them practically all the time. In this paper, we proposed a food calorie and nutrition measurement system that can help patients and dieticians to measure and manage daily food intake. Our system is built on food image processing and uses nutritional fact tables. Via a special calibration technique, our system uses the built-in camera of such mobile devices and records a photo of the food before and after eating it in order to measure the consumption of calorie and nutrient components. The proposed algorithm used color, texture and contour segmentation and extracted important features such as shape, color, size and texture. Using various combinations of these features and applying a support vector machine as a classifier, a good classification was achieved and simulation results show that the algorithm recognizes food categories with an accuracy rate of 92.2%, on average.
|
Page generated in 0.0945 seconds