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Search Results: 1 - 10 of 3653 matches for " Products of Vectors "
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On the Rotation of a Vector Field in a Four-Dimensional Space  [PDF]
Leonardo Simal Moreira
Applied Mathematics (AM) , 2014, DOI: 10.4236/am.2014.51015
Abstract:

Recently I published a paper in the journal ALAMT (Advances in Linear Algebra & Matrix Theory) and explored the possibility of obtaining products of vectors in dimensions higher than three [1]. In continuation to this work, it is proposed to develop, through dimensional analogy, a vector field with notation and properties analogous to the curl, in this case applied to the space IR4. One can see how the similarities are obvious in relation to the algebraic properties and the geometric structures, if the rotations are compared in spaces of three and four dimensions.

Fauna anofélica da cidade de Belém, Pará, Brasil: dados atuais e retrospectivos
Silva, Ana de Nazaré Martins da;Fraiha-Neto, Habib;Santos, Carla Christiani Bastos dos;Segura, Maria de Nazaré de Oliveira;Amaral, Jane Cristina de Oliveira Faria;Gorayeb, Inocêncio de Sousa;Lacerda, Raimundo Nonato da Luz;Sucupira, Izis M?nica Carvalho;Pimentel, Le?ncio Nazaré;Conn, Jan E.;Póvoa, Marinete Marins;
Cadernos de Saúde Pública , 2006, DOI: 10.1590/S0102-311X2006000800006
Abstract: we present the results of anopheline captures in belém, pará, brazil, from 1995-2004, and a comparison with captures from 1930-1999. in the earlier period, 20 species were identified: anopheles albitarsis s.l., an. aquasalis, an. argyritarsis, an. braziliensis, an. darlingi, an. eiseni, an. evansae, an. galvaoi, an. intermedius, an. kompi, an. mediopunctatus, an. nimbus, an. nuneztovari, an. oswaldoi, an. peryassui, an. punctimacula, an. shannoni, an. strodei, an. thomasi, and an. triannulatus. seven of these species were not found in 1995-2004 (an. argyritarsis, an. eiseni, an. galvaoi, an. kompi, an. nimbus, an. punctimacula, and an. thomasi). the persistence of so many species is probably due to the local preservation of forest areas. two species are of vectorial importance (an. darlingi and an. aquasalis). an. aquasalis is still the most abundant species (46.26% of adults, 99.21% of larvae) and the only one detected in all capture sites. there is thus a potential risk of malaria transmission in the entire municipality of belém.
Parasitóides de Chrysomya megacephala (Fabricius) coletados em Itumbiara, Goiás
Marchiori,Carlos H;
Revista de Saúde Pública , 2004, DOI: 10.1590/S0034-89102004000200024
Abstract: this study determined the species of parasitoids associated with chrysomya megacephala, collected on bovine kidney baits, in itumbiara, state of goias, brazil. the pupae were obtained by flotation. they were individually placed in gelatin capsules until the emergence of the adult flies or their parasitoids. the overall prevalence of parasitism was 18.6%. brachymeria podagrica, nasonia vitripennis and pachycrepoideus vindemiae presented frequencies of 8.6%, 8.6% and 1.4%, respectively. this work reports for the first time the occurrence of brachymeria podagrica in pupae of chrysomya megacephala.
Nota sobre culicídeos adultos coletados na regi?o sul do Brasil
Barbosa,Orlando Carlos; Teodoro,Ueslei; Lozovei,Ana Leuch; La Salvia Filho,Vicente; Spinosa,Roberto Palma; Lima,Edson Maurício de; Ferreira,Maria Eugênia Moreira Costa;
Revista de Saúde Pública , 1993, DOI: 10.1590/S0034-89101993000300010
Abstract: during the period from september 1988 to april 1990, mosquitoes were captured using shannon light trap and falc?o light traps, in terra boa county, in the north of paraná state, brazil. the shannon trap was installed in the outlying modified forest and falc?o traps were installed in the modified forest and domiciliary areas. the prevalence of species was verified and the methods of capture compared.
Observa??es sobre mosquitos Culicidae adultos em cultivo irrigado de arroz no Vale do Ribeira, Estado de S?o Paulo, Brasil
Forattini,Oswaldo Paulo; Gomes,Almério de Castro; Kakitani,Iná;
Revista de Saúde Pública , 1989, DOI: 10.1590/S0034-89101989000400006
Abstract: a collection of adult culicidae was carried out during the period from may 1984 to september 1985, in a rice field in the polder of the experimental station of pariquera-a?ú, in the ribeira valley (s. paulo state, brazil). cdc miniature traps, supplemented with dry ice, were used. a total of 2,686 mosquitoes were collected. the most frequent were the coquillettidia and mansonia genera (nearly 55% of the specimens caught). aedes scapularis,as an isolated species, contributed with near by 11% of the total catch. culex (melanoconion) represented almost 24% of the mosquitoes caught. the sequence of events involved in the flooding of rice seems be associated with the production of coquillettidia and mansonia. ae. scapularis seems to profit from the artificial ecotope represented by the irrigated rice field as a means by which to increase its adaptation to the artificial human environment. no evidence was obtained on the association between culex (melanoconion) catches and the cultivation of the rice field. it seems that cultivation exercises no influence on the local anopheles and psorophora species.
On the Infinite Products of Matrices  [PDF]
Yousry S. Hanna, Samya F. Ragheb
Advances in Pure Mathematics (APM) , 2012, DOI: 10.4236/apm.2012.25050
Abstract: In different fields in space researches, Scientists are in need to deal with the product of matrices. In this paper, we develop conditions under which a product Пi=0 of matrices chosen from a possibly infinite set of matrices M={Pj, j∈J} converges. There exists a vector norm such that all matrices in M are no expansive with respect to this norm and also a subsequence {ik}k=0 of the sequence of nonnegative integers such that the corresponding sequence of operators {Pik}k=0 converges to an operator which is paracontracting with respect to this norm. The continuity of the limit of the product of matrices as a function of the sequences {ik}k=0 is deduced. The results are applied to the convergence of inner-outer iteration schemes for solving singular consistent linear systems of equations, where the outer splitting is regular and the inner splitting is weak regular.
Genetic Transformation Studies on Avocado Cultivar “Hass” (Persea americana)  [PDF]
Muhammad F. Ahmed, Arumugam S. Kantharajah, Paul Holford
American Journal of Plant Sciences (AJPS) , 2012, DOI: 10.4236/ajps.2012.39148
Abstract: The use of traditional breeding for improvement of avocado cultivars is time consuming, hence other methods such as genetic transformation by Agrobacterium is indispensable to adopt. The strain GV3850/pBI121gave best transformation outcome compared to five other binary vectors (AGL1/pCGP904; AGL1/pBI121; GV3850/pCGP904; LBA4404/pCG-P904 and LBA4404/pBI121) under different pH and acetosyringone concentrations. The optimal condition for reliable transformation was by using 200 μM acetosyringone and a pH of 5.2. Transformed embryonic shoots co-cultivated with GV3850/pBI121 were tested using the histochemical x-gluc assay. Further analysis was conducted by polymerase chain reaction using specific primers for the reporter gene (GUS).
Local climate changes and the spread of malaria in Rwanda  [PDF]
Sascha M. Henninger
Health (Health) , 2013, DOI: 10.4236/health.2013.54096
Abstract:

A population’s health makes it possible to draw conclusions about a country’s general development level. In connection with local climatic changes, for example, we can assess how well a society adjusts to the new conditions. To that effect, it has been observed during the last few years that global climate change can also affect human health in various ways. We can differentiate direct health impacts (e.g. extreme weather events, natural catastrophes caused by the weather) from indirect ones. However, the indirect consequences cause by far the greater damages to health. They are being spread increasingly by vectors (mosquitoes, ticks, etc.). Especially when a vector-carried infectious disease (e.g. malaria) migrates into areas where it is not endemic, considerable societal problems can result. The people living there would be immunologically unprepared.

Intra-Domiciliary Transmission of Chagas’ Disease in Rural Areas of Yucatan Mexico  [PDF]
Eugenia Guzman-Marin, Karla Y. Acosta-Viana, Marylin Puerto-Solís, Antonio Ortega-Pacheco, Matilde Jimenez-Coello
Open Journal of Epidemiology (OJEpi) , 2016, DOI: 10.4236/ojepi.2016.64024
Abstract: With the objective to describe the relationship between T. cruzi infection in humans and sinantropic reservoir and vectors in the rural conditions a study was performed in municipalities of the Yucatan state in Mexico. Blood samples from humans, dogs and opossum were taken from the households. Vectors were also collected and the infection and infestation indexes were calculated. Serum samples were evaluated by indirect hemagglutination (IH) and indirect immunofluorescence (IFI) to determine IgG antibodies against Trypanosoma cruzi. The polymerase chain reaction (PCR) was also performed in the samples taken from humans and reservoirs. Blood smears were performed in reservoirs. Sampled humans underwent to an electrocardiographic study to identify functional and conduction alterations of the heart. Household building characteristics were noted. A total of 367 blood samples were collected from people. The presence of IgG antibodies was 16.6% and 71.0% at PCR. Electrocardiographic studies revealed that 31% of patients seropositive to T. cruzi have a medical condition. 20.0% of dogs were seropositive and 68.5 positive to PCR. At the direct detection 13.6% resulted positive. In opossum 29.1% were seropositive and 72.9% positive to PCR. A total of 269 triatomineos were captured and 52.7% were infected with T. cruzi. The infection and infestation index were 52.4% and 60.8% respectively. The presence of adult vectors and their nymph’s were more frequently found in households made with wattle roofs (45.2 and 73.9 % respectively) than other kind of building materials. Electrocardiographic abnormalities found in positive persons were: Incomplete right bundle branch block (55%), tachycardia (35%), old myocardial infarction (5%) and incomplete block of the left bundle (5%). This work highlights the importance of comprehensive studies on the transmission of T. cruzi in the Yucatan where the link between human infection in synanthropic reservoirs and vectors is established. This information is important to design programs for the epidemiological surveillance and control to break the chain of transmission of the disease.
Description of the derived categories of tubular algebras in terms of dimension vectors  [PDF]
Hongbo Lv, Zhongmei Wang
Open Journal of Applied Sciences (OJAppS) , 2012, DOI: 10.4236/ojapps.2012.24B041
Abstract: In this paper, we give a description of the derived category of a tubular algebra by calculating the dimension vectors of the objects in it.
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