Is Rhinoplasty Surgery a Risk Factor for Low Back Pain among Otorhinolaryngologists?

This study aimed to investigate the relationship between low back pain and performing rhinoplasty and presents the data related to the prevalence of low back pain among the otorhinolaryngologists included in a sample. The questionnaire prepared by the researchers was completed by volunteer otorhinolaryngologists who participated in the 22nd International Rhinocamp Congress. The questionnaire prepared to investigate low back problems contained items to obtain the demographic features of the participants, whether they were performing septorhinoplasty, how many years they had been performing this procedure, whether they had any problem (ache, pain, or discomfort) in the lumbar region, whether they had been hospitalized or had surgery due to this problem, low back pain frequency and intensity, and the presence of low back pathologies (e.g., protrusion, perforated disc, and bulging) detected by magnetic resonance imaging. The research was performed with the participation of 110 otorhinolaryngologists, of whom 37.3% (n = 41) were women and 62.7% (n = 69) were men, 79.1% (n = 87) were performing rhinoplasty surgery, and 69.1% (n = 76) had low back pain. Low back pain was reported in 72.4% (n = 63) of the doctors performing rhinoplasty and 56.5% (n = 13) of those who did not perform this surgery. There was a statistically significant relationship between the presence of low back pain and whether the doctors performed rhinoplasty surgery (χ2 = 4.151; p = 0.042 [< 0.05]). In addition, the complaints of low back pain were affected by the number of years the doctors had been performing rhinoplasty (p = 0.001 < 0.01). Low back pain was found to be frequent among otorhinolaryngologists performing rhinoplasty. Training, exercises, and performing the operation in a position that will prevent the occurrence of lower back pain can improve quality of life and minimize labor loss caused by pain among rhinoplasty surgeons.

DISTRIBUIÇÃO LONGITUDINAL DE SEMENTES DE SOJA COM DIFERENTES MÉTODOS DE TRATAMENTO FITOSSANITÁRIO POR UM DOSADOR DE DISCO ALVEOLAR HORIZONTAL

A expressão do potencial genético da cultura da soja, possui relação direta com a qualidade da operação de semeadura, bem como, a utilização de sementes de elevado vigor e qualidade sanitária. O tratamento fitossanitário de sementes, é uma alternativa utilizada com a finalidade de proteger as sementes e plântulas nos estádios iniciais de desenvolvimento da cultura contra a ação de patógenos causadores de danos. Deste modo, objetivou-se avaliar diferentes métodos e produtos utilizados para o tratamento fitossanitário de sementes de soja, observando o seu efeito no desempenho de um dosador de disco alveolar horizontal. Os fatores observados foram os diferentes métodos de tratamento fitossanitário de sementes em quatro níveis, tratamento em tambor rotativo, adição de polímeros em tratamento industrial, tratamento industrial com adição de grafite e sementes sem adição de produto (testemunha). O segundo fator, foram as diferentes densidades de semeadura em quatro níveis (12, 14, 16, 18 sem m-1). As variáveis analisadas foram os espaçamentos entre sementes, aceitáveis, múltiplos, falhos e precisão. Após a análise e interpretação dos dados concluiu-se que, tanto o lubrificante sólido grafite como também os polímeros de recobrimento, podem ser utilizados sem que ocorra redução da qualidade de distribuição longitudinal de sementes com tratamento fitossanitário.Palavras-chave: densidade de semeadura, dosador de precisão, polímeros adesivos. LONGITUDINAL DISTRIBUTION OF SOYBEAN SEEDS WITH DIFFERENT METHODS OF PHYTOSANITARY TREATMENT BY A HORIZONTAL PERFORATED DISC METER ABSTRACT:The expression of the genetic potential of the soybean crop is directly related to the quality of the sowing operation, as well as the use of high vigor seeds and sanitary quality. Phytosanitary treatment of seeds is an alternative used to protect seeds and seedlings in the early stages of development of the crop against the action of pathogens causing damage. In this way, the objective was to evaluate different methods and products used for the phytosanitary treatment of soybean seeds, observing its effect on the performance of a horizontal disk metering. The factors observed were the different methods of phytosanitary treatment of seeds at four levels, rotary drum treatment, addition of polymers in industrial treatment, industrial treatment with addition of graphite and seeds without addition of product (control). The second factor was the different sowing densities at four levels (12, 14, 16, 18 without m-1). The analyzed variables were seed spacings, acceptable, multiple, fail and precision. After the analysis and interpretation of the data, it was concluded that both the graphite solid lubricant and the coating polymers can be used without reducing the quality of the longitudinal distribution of seeds with phytosanitary treatment.Keywords: seeding density, metering precision, adhesive polymers.

Effect of different conductor tubes on the longitudinal distribution of corn seeds

ABSTRACT The correct longitudinal distribution of seeds by the seeder machine is one of the features that most contributes to obtain an adequate plant stand and good crop yield. The objective of this study was to evaluate the longitudinal distribution of corn seeds by seed conductor tube types, combined with a horizontal perforated disc and a pneumatic meter, altering the seeding density rate. The experiment was conducted in a laboratory using a seed meter test bench. Treatments were a combination of two seed meters, six conductor tubes and four peripheral speeds for the meter disc, corresponding to densities of 60, 70, 80 and 90 thousand corn seeds per hectare and were organized in a three-factor scheme with four repetitions. By increasing the seeding rate into the same ground speed, there was a reduction in the percentage of acceptable spacing, this effect being more pronounced when conductor tubes with a small diameter and straight profile were used.

Improving the Diffusion Controlled Cementation of Copper Ions on a Fixed Bed of Zinc Raschig Rings Using Flow Pulses in a Batch Reactor

This work investigates the possibility of improving the kinetics of the diffusion controlled cementation of copper on a fixed bed of zinc Raschig rings in a batch reactor by using flow pulses induced through the bed by a pulsating perforated disc. The kinetics of the cementation reaction was investigated under different conditions of initial concentration of copper ions, frequency and amplitude of oscillation (vibration velocity), zinc ring diameter, bed height and temperature. The effect of temperature was found to fit the Arrhenius equation with an activation energy of 5.5 kcal/mole which confirms the diffusion controlled nature of the reaction. A dimensionless correlation in the form that: Sh = 6.9 Re0.55 Sc0.33 (Pd/Bh)0.49 was deduced. Industrial application of the results obtained was discussed.

Comparison of metering mechanisms of corn seed

It was compared the performance of the metering mechanism of corn seeds (Zea mays) in direct seeding in an area of 200 ha, a property in Piraí do Sul, State of Paraná - PR, in Brazil. It was seeded 4 maize hybrids, 50 ha of each, with seeds of different sieves. The experiment was conducted in a randomized block design (RBD), with 3 treatments and 9 repetitions for each corn hybrid. The treatments were the pneumatic seed of metering mechanisms, horizontal perforated disc with and without ramp®. The plots were 40 m² and were distributed at the early, middle and late sowing. The variables analyzed in each corn hybrid were initial population, faulty spacing, multiple spacing, acceptable spacing, and yield components. As there were no significant differences in the variables, it was concluded that the quality of seeding with different systems of distribution was similar in the different sieves of distributed corn seeds.