9,239 research outputs found
Design of an embedded microcomputer based mini quadrotor UAV
No full textThis paper describes the design and realization of a mini quadrotor UAV (Unmanned Aerial Vehicle) that has been initiated in the Systems and Control Laboratory at the Computer and Automation Research institute of the Hungarian Academy of Science in collaboration with control departments of the Budapest University of Technology and Economics. The mini quadrotor UAV is intended to use in several areas such as camera-based air-surveillance, traffic control, environmental measurements, etc. The paper focuses upon the embedded microcomputer-based implementation of the mini UAV, describes the elements of the implementation, the tools realized for mathematical model building, as well as obtains a brief outline of the control design
O uso de mini-implantes como ancoragem ortodôntica
No full textTCC (graduação) - Universidade Federal de Santa Catarina, Universidade Federal de Santa Catarina, Centro de Ciências da Saúde, Curso de Odontologia.A ancoragem ortodôntica é decisiva para o sucesso do tratamento ortodôntico, onde dispositivos intra e extra bucais servem como recursos a serem utilizados pelo profissional. Os dispositivos extra bucais dependem muito da colaboração do paciente quanto ao seu uso, podendo atrasar ou comprometer o sucesso do tratamento. Dispositivos intra bucais apresentam sucesso superior aos extras bucais, pois são de maior conforto para o paciente e não dependem da colaboração quanto ao seu uso, porém o paciente deve ter cuidados especiais quanto a higienização da região do mini implante instalado. Quanto à instalação dos mini implantes, é um procedimento cirúrgico simples, podendo ser instalado em diversas áreas do osso alveolar, sendo a cicatrização fácil e sua remoção não apresenta grandes dificuldades. Este trabalho apresentará através de revisão de literatura uma abordagem sobre aparelhos extra e intra bucais como ancoragem ortodôntica convencional e relata principalmente sobre a ancoragem ortodôntica com o uso de mini implantes, apresentando o que são os mini implantes, design e características, seleção e instalação, como é sua aplicação e suas diversas aplicações clínicas
A Mini-Neptune Orbiting the Metal-poor K Dwarf BD+29 2654
No full textWe report the discovery and Doppler mass measurement of a 7.4 days 2.3 R ? mini-Neptune around a metal-poor K dwarf BD+29 2654 (TOI-2018). Based on a high-resolution Keck/HIRES spectrum, the Gaia parallax, and multiwavelength photometry from the UV to the mid-infrared, we found that the host star has T eff = 4174 ? 42 + 34 K, log g = 4.62 ? 0.03 + 0.02 , [Fe/H] = ? 0.58 ± 0.18, M * = 0.57 ± 0.02 M ?, and R * = 0.62 ± 0.01 R ?. Precise Doppler measurements with Keck/HIRES revealed a planetary mass of M p = 9.2 ± 2.1 M ? for TOI-2018 b. TOI-2018 b has a mass and radius that are consistent with an Earthlike core, with a ?1%-by-mass hydrogen/helium envelope or an ice-rock mixture. The mass of TOI-2018 b is close to the threshold for runaway accretion and hence giant planet formation. Such a threshold is predicted to be around 10M ? or lower for a low-metallicity (low-opacity) environment. If TOI-2018 b is a planetary core that failed to undergo runaway accretion, it may underline the reason why giant planets are rare around low-metallicity host stars (one possibility is their shorter disk lifetimes). With a K-band magnitude of 7.1, TOI-2018 b may be a suitable target for transmission spectroscopy with the James Webb Space Telescope. The system is also amenable to metastable Helium observation; the detection of a Helium exosphere would help distinguish between a H/He-enveloped planet and a water world
Análise histomorfológica e histomorfométrica de mini-implantes para ancoragem ortodôntica imediata e precose
No full textTese (doutorado) - Universidade Federal de Santa Catarina, Centro de Ciências da Saúde . Programa de Pós-Graduação em Odontologia.O objetivo do presente estudo foi avaliar a taxa de sobrevivência e a resposta óssea de mini-implantes submetidos a forças estáticas após diferentes períodos de osseointegração. Os resultados mostraram taxas de sobrevivência de 100% e 77,78% para os grupos controle e experimento, respectivamente. Inflamação do tecido mole perimplantar foi observada em todas as perdas de mini-implantes, que ocorreram após a aplicação da força (instalação da mola). Não houve, entre todos os grupos, diferenças estatisticamente significantes entre os valores de contato do osso à superfície do mini-implante. Esses resultados indicam a possibilidade de aplicação clínica de forças ortodônticas, imediatamente ou precocemente, após a implantação de mini-implante
TOI-969: a late-K dwarf with a hot mini-Neptune in the desert and an eccentric cold Jupiter
No full textContext. The current architecture of a given multi-planetary system is a key fingerprint of its past formation and dynamical evolution history. Long-term follow-up observations are key to complete their picture. Aims. In this paper, we focus on the confirmation and characterization of the components of the TOI-969 planetary system, where TESS detected a Neptune-size planet candidate in a very close-in orbit around a late K-dwarf star. Methods. We use a set of precise radial velocity observations from HARPS, PFS, and CORALIE instruments covering more than two years in combination with the TESS photometric light curve and other ground-based follow-up observations to confirm and characterize the components of this planetary system. Results. We find that TOI-969 b is a transiting close-in (Pb ? 1.82 days) mini-Neptune planet (Formula Presented), placing it on the lower boundary of the hot-Neptune desert (Teq,b = 941 ± 31 K). The analysis of its internal structure shows that TOI-969 b is a volatile-rich planet, suggesting it underwent an inward migration. The radial velocity model also favors the presence of a second massive body in the system, TOI-969 c, with a long period of (Formula Presented) days, a minimum mass of (Formula Presented), and a highly eccentric orbit of (Formula Presented). Conclusions. The TOI-969 planetary system is one of the few around K-dwarfs known to have this extended configuration going from a very close-in planet to a wide-separation gaseous giant. TOI-969 b has a transmission spectroscopy metric of 93 and orbits a moderately bright (G = 11.3 mag) star, making it an excellent target for atmospheric studies. The architecture of this planetary system can also provide valuable information about migration and formation of planetary systems. © The Authors 2023
Heterologous production of labdane-type diterpenes in the green alga Chlamydomonas reinhardtii
No full textLabdane diterpenes (LDs), and especially sclareol, are important feedstocks for the pharmaceutical and cosmetic industries, and therefore several lines of research have led to their heterologous production in non-photosynthetic microbes and higher plants. The potential of microalgae as bioreactors of natural products has been established for a variety of bioactive metabolites, including terpenes. In this work, a codon optimized sequence encoding a key plant labdane-type diterpene (LD) cyclase, copal-8-ol diphosphate synthase from Cistus creticus (CcCLS), was introduced into the chloroplast genome of Chlamydomonas reinhardtii. Of 49 transplastomic algal lines, 12 produced variable amounts of four LD compounds, namely ent-manoyl oxide, sclareol, labda-13-ene-8α,15-diol and ent-13-epi-manoyl oxide. The total LD concentrations measured in the transplastomic lines reached 1.172 ± 0.05 μg/mg cell DW for the highest overall producer, while the highest yield for sclareol was 0.038 ± 0.001 μg/mg cell DW. Thus, transplastomic expression of a key plant labdane diterpene cyclase in the C. reinhardtii chloroplast genome enabled the production of important plant-specific LD compounds
Mini erythema migrans - A sign of early Lyme borreliosis
No full textBackground: An erythema migrans (EM) remaining smaller than 5 cm in diameter, called mini EM by us, has not been addressed in detail. Objective: To study the significance of the mini EM as a sign of Lyme borreliosis. Methods: Patients with suspected mini EM were retrospectively selected out of 257 consecutive patients with EM. The diagnosis of mini EM rested on the cultivation of Borrelia burgdorferi. Species and subtype analysis of culture isolates was performed using outer surface protein A (OspA) polymerase chain reaction followed by restriction fragment length polymorphism and sequencing of the OspA gene. Results: There was one patient with definite (0.4%) and another patient with a questionable mini EM. Borrelia garinii OspA type 6 was identified in the patient with the definite and B. burgdorferi sensu lato in the patient with the questionable mini EM. Conclusion: The mini EM represents an important and apparently uncommon sign of early Lyme borreliosis
Mini-loop ligation of a bleeding duodenal Dieulafoy's lesion
No full textTwo percent of gastrointestinal hemorrhages are caused by Dieulafoy's lesions, which are located in duodenum in only 15% of cases. There are no recommendations regarding the prime endoscopic treatment technique for this condition. A 61-year-old woman presented with melena without signs of hemodynamic instability. During an urgent upper endoscopy, blood oozing from the normal mucosa of the duodenum was seen and this was classified as a Dieulafoy's lesion. A mini-loop was opened at the rim of a transparent ligation chamber, at the end of the endoscope, and after aspiration of the lesion, closed and detached. Complete hemostasis was achieved without early or postponed complications. In every day clinical practice, mini-loop ligation is rarely used because of possible complications, such as site ulceration, organ perforation, re-bleeding and possible inexperience of the operator. To the best of our knowledge this is the first case of successful treatment of bleeding duodenal Dieulafoy's lesion by mini-loop ligation
Examining the nature of feedback within the Mini Clinical Evaluation Exercise (Mini-CEX): an analysis of 1427 Mini-CEX assessment forms
No full textBackground: Despite the growing use, studies have demonstrated some limitations related to the feedback provided in the context of the increasing use of the Mini Clinical Evaluation Exercise (Mini-CEX) in undergraduate medical education. This study examined the written feedback provided on the Mini-CEX form to determine its usefulness as a learning tool for students.Methods: 1427 Mini-CEX assessment forms of final year medical students were collected. Written feedback, both on students' strength and weakness, was categorized and correlated with the variables of clinical case complexity, assessors' clinical position and students' clinical performance rating.Results: The number of general feedback comments for students' strengths and development were 953 (65.3%) and 604 (38.64%) respectively. Less than 30% of the feedback for each domain was categorized as specific feedback. Significant associations were found between feedback on strength and clinical case complexity (X-2 =17.48,
Influence of the Dimensions of the Antrostomy on Osseointegration of Mini-implants Placed in the Grafted Region After Sinus Floor Elevation: A Randomized Clinical Trial
No full textPURPOSE: To evaluate the osseointegration of mini-implants placed in grafted sinuses with lateral windows of two different dimensions. MATERIALS AND METHODS: Sinus floor augmentation was performed in volunteers using a lateral window. The antrostomy was systematically prepared with a height of either 8 mm (large group) or 4 mm (small group). After 6 months of healing, mini-implants were placed in the grafted region. Biopsy specimens including the mini-implants were harvested 3 months after placement. RESULTS: Twenty biopsy specimens, 10 from each group, were suitable for the histologic analysis. Similar amounts of new bone-to-implant contact were obtained in both the large (41.1% ± 19.5%) and the small (42.8% ± 13.2%) groups (P = .940). Small percentages of residues of xenograft were found in contact with the implant surface, with 0.6% ± 1.1% in the large group and 5.9% ± 9.5% in the small group (P = .098). The new bone density around the implants was 31.7% ± 8.2% and 34.0% ± 7.9% in the large and small groups, respectively (P = .623). CONCLUSION: The dimensions of the antrostomy did not influence the histologic healing of implants placed 6 months after sinus floor augmentation
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