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Search Results: 1 - 10 of 31073 matches for " Herman;Santos "
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Low-cost processing technology for the synthesis of calcium phosphates/collagen biocomposites for potential bone tissue engineering applications
Santos, Maria Helena;Mansur, Herman Sander;
Materials Research , 2007, DOI: 10.1590/S1516-14392007000400018
Abstract: in the present study two novel composites of calcium phosphates (cap) and collagen (col) were synthesized, hydroxyapatite/collagen (ha/col) and hydroxyapatite-btricalcium phosphate/col (habtcp/col). collagen was extracted from bovine pericardium submitted to enzymatic digestion and purification by ion-exchange chromatography yielding high purity grade type i collagen. biocomposites of hap/col and habtcp/col were produced with a calcium phosphate/col ratio of 80/20 (wt. (%)) and were characterized by chemical analysis, light microscopy and scanning electron microscopy, x ray diffraction and ft-infrared spectroscopy. sem results of the cap powders showed agglomerates of particles at the nanometric size range with predominantly columnar shape and average chemical composition of [ca/p] = 1.67. ftir analysis of collagen has confirmed the major vibrational bands associated with chemical groups like amides and hydroxyls usually found in proteins. sem micrographs have indicated that both morphological and structural features and chemical composition of the composites were very similar to their precursors, collagen and calcium phosphate components. sds-page characterization results of protein extracted and purified has showed that bovine type i collagen was successfully obtained. finally, the biocomposites presented a homogeneous aspect with the calcium phosphate particles aggregated to the collagen fibers. hence, the novel developed biocomposites have high potential to be used for rebuilding small lesions in bone tissue engineering.
Credibility and Signaling as Strategic Drivers in China’s African Security Engagement  [PDF]
Fanie Herman
Chinese Studies (ChnStd) , 2015, DOI: 10.4236/chnstd.2015.41005
Abstract: The aim of this paper is to show that strategic interaction provides a fruitful way to understand China’s decision-making behavior. States are actors in global politics and frequently have to make choices that are strategic. Credibility and uncertainty are central issues in this environment of incomplete information. This raises the question how China signals its motivations along this strategic chessboard. Strategic interaction assumes purposeful behavior from China in the African security environment. Signaling allows China to consider the problem of unknown motivations, making choices based in part, on what other actors are likely to do in the future. Knowing the choices of other African actors can help China judge what likely responses are.
Studies on Procamallanus (Spirocamallanus) pereirai Annereaux, 1946 (Nematoda: Camallanidae), with new host records and new morphological data on the larval stages
Santos, Cláudia Portes;Cárdenas, Melissa Querido;Lent, Herman;
Memórias do Instituto Oswaldo Cruz , 1999, DOI: 10.1590/S0074-02761999000500013
Abstract: larval stages and adults of procamallanus (spirocamallanus) pereirai annereaux, 1946 are described from naturally infected paralonchurus brasiliensis (steindachner) (sciaenidae) from the coast of the state of rio de janeiro, brazil. the translucent first-stage larvae have a denticulate process at the anterior end, no buccal capsule or esophagus undifferentiated into anterior muscular and posterior glandular parts and an elongate tail; third-stage larvae have a tail with three terminal projections, a buccal capsule divided into an anterior portion with 12-20 ridges running to the left and a posterior smooth portion, and an esophagus with muscular and glandular regions. fourth-stage larvae exhibit a buccal capsule lacking a distinct basal ring with ridges running to the right and a tail with two terminal processes, as in adults. new host records are reported and their role in its life-cycle are discussed.
Morphological aspects of marine monogeneans (Platyhelminthes) parasitic on the gills of Auxis thazard (Lacépède) (Scombridae) from Rio de Janeiro, Brazil
Mogrovejo, Cristina Dias;Lent, Herman;Santos, Cláudia Portes;
Revista Brasileira de Zoologia , 2004, DOI: 10.1590/S0101-81752004000200007
Abstract: allopseudaxine macrova (unnithan, 1957), churavera triangula (mamaev, 1967), hexostoma auxisi palombi, 1943 and h. keokeo yamaguti, 1968 are studied based on light and scanning electron microscopy. the previously proposed synonymy of h. auxisi and h. keokeo is not accepted. morphological changes between juvenile and adult hexostomatids are highlighted.
Studies on Procamallanus (Spirocamallanus) pereirai Annereaux, 1946 (Nematoda: Camallanidae), with new host records and new morphological data on the larval stages
Santos Cláudia Portes,Cárdenas Melissa Querido,Lent Herman
Memórias do Instituto Oswaldo Cruz , 1999,
Abstract: Larval stages and adults of Procamallanus (Spirocamallanus) pereirai Annereaux, 1946 are described from naturally infected Paralonchurus brasiliensis (Steindachner) (Sciaenidae) from the coast of the State of Rio de Janeiro, Brazil. The translucent first-stage larvae have a denticulate process at the anterior end, no buccal capsule or esophagus undifferentiated into anterior muscular and posterior glandular parts and an elongate tail; third-stage larvae have a tail with three terminal projections, a buccal capsule divided into an anterior portion with 12-20 ridges running to the left and a posterior smooth portion, and an esophagus with muscular and glandular regions. Fourth-stage larvae exhibit a buccal capsule lacking a distinct basal ring with ridges running to the right and a tail with two terminal processes, as in adults. New host records are reported and their role in its life-cycle are discussed.
Combinatorial pseudo-Triangulations
David Orden,Francisco Santos,Brigitte Servatius,Herman Servatius
Mathematics , 2003, DOI: 10.1016/j.disc.2005.09.045
Abstract: We prove that a planar graph is generically rigid in the plane if and only if it can be embedded as a pseudo-triangulation. This generalizes the main result of math.CO/0307347 which treats the minimally generically rigid case. The proof uses the concept of combinatorial pseudo-triangulation, CPT, in the plane and has two main steps: showing that a certain ``generalized Laman property'' is a necessary and sufficient condition for a CPT to be ``stretchable'', and showing that all generically rigid plane graphs admit a CPT assignment with that property. Additionally, we propose the study of combinatorial pseudo-triangulations on closed surfaces.
Oil Streak Visualisation of Fluid Flow Over Single D-Type Cylinder  [PDF]
Astu Pudjanarsa, Herman Sasongko
World Journal of Mechanics (WJM) , 2012, DOI: 10.4236/wjm.2012.24024
Abstract: An experimental study on the effect of cut angle on circular cylinders to the drag force is performed. Six cylinders were cut at different angles and the air flow impinges perpendicular to the cut surface of the cylinder. The cut angles applied include: 0°, 30°, 45°, 53°, 55°, and 75°. The shear layer visualisation on the surface of cylinder was conducted as well. Drag force was measured using a wind tunnel force balance and the wind speed was set so that a corresponding Rey-nolds number of 5.3 × 104 was achieved. Visualisation was carried out by covering the cylinder with paper wetted by mixture of oil and titanium dioxide powder. Experimental results show that drag force has similar trend to that of previous experiment results. The minimum drag coefficient is attained at the cut angle of 53°. From oil streak visualisation the streamlines pattern of the flow over the cylinder could be reconstructed.
The Role of the Chinese Media in Establishing Common Ground between Sino-African Philosophical Traditions: A Case Study on Peacekeeping Operations  [PDF]
Fanie Herman, Andrew Szanajda
Chinese Studies (ChnStd) , 2013, DOI: 10.4236/chnstd.2013.21006
Abstract: This work examines the role of the Chinese media in African peacekeeping operations (PKOs) in view of Chinese and African traditions that are combined through the concept of communitarianism. The values and belief systems of Confucianism and the African philosophy of Ubuntu in the peacekeeping environment stress the importance of focusing on collective achievements and producing results for the common good. Meanwhile, positive reporting is used as media approach to harmonize interaction between the peacekeepers and the parties in a conflict. As a result, as similar communal features are emphasized, value is added to China’s peacekeeping presence and confidence-building is encouraged. The Chinese media also has a good resonance on the perspectives of Africans toward China’s PKOs.
Upgrading Tests Using PSIM Tool of MPPT-PV Feedback-Current Controller  [PDF]
Herman Enrique Fernandez Hernandez
Energy and Power Engineering (EPE) , 2016, DOI: 10.4236/epe.2016.84022
Abstract: This paper presents improvement tests based in a feedback-current controller designed to Tracking Maximum Power Point in photovoltaic system (MPPT-PV). Previously, a version was developed exhibiting results satisfactory in simulation and through of a low cost prototype. Now, using a sophisticated physical model of solar cell available in PSIM program is shown other cases, considering variations both irradiation and temperature to evaluate successfully the controller. The results show that its system is suitable under dynamical changing atmospheric conditions operating with effectiveness acceptable.
Avalia o da técnica de condicionamento psicológico "m o-sobre-a-boca" no Município de Porto Alegre/RS
Lisiane Battastini dos Santos,Suzana Sommer,M?nica Herman Spiguel,Maximiano Ferreira Tovo
Stomatos , 2006,
Abstract: In the specializated literature, which approach the interface pediatric dentistry, psychology is been observed that the infantile behavior management techniques are been discussed and revalued. Many techniques are indicated for children that have hysterical behavior and doesn t cooperative, with intention to adapt them for attendance. Outstading, our study has objetiveted to avalue this technique application of psychology condicioning Hand- Over-Mouth by specialist in pediatric dentistry, that works around municipal district Porto Alegre/RS. This questionary embrance 13 questions about identification (age, sex, year graduation conclusion, time and what was the university), the use of HOM technique and its implication. A total of 63 pediatric dentistries cooperated of this study. Among these, 28 used this technique (44,4%) and 35 didn t use it (55,6%) with the present research, we could concluded that men use this technique more than women. There were association between the use of technique and the time of his specialization as well as the professional age and that the majority of this professional look for parent permition to use this technique. However, even knowing that many professionals can legally take the responsibility because of agression, a few number of them ask parent permition under written form.
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