Pemanfaatan Limbah Padat Pasir Silika Limbah Sandblasting dan Fly Ash untuk Beton HVFA-SCC

Beton High Volume Fly Ash (HVFA) merupakan campuran beton yang menggunakan fly ash dengan persentase fly ash yang digunakan lebih dari 50%. Adanya kandungan bahan kimia silika dan alumina, yang membuat fly ash memiliki sifat pozzolanik seperti semen, sehingga dapat dimanfaatkan untuk menjadi material pengganti semen. Dalam penelitian ini metode yang digunakan adalah metode eksperimen dengan melakukan pembuatan beton high volume fly ash - self compacting concrete (HVFA-SCC) yang memanfaatkan limbah sandblasting sebagai pengganti agregat halus dan limbah fly ash sebagai pengganti semen yang akan dibandingkan dengan beton normal dan beton HVFA menggunakan pasir biasa. Hasil penelitian menunjukkan komposisi beton HVFA dengan variasi campuran 40% limbah fly ash dengan substitusi pasir silika limbah sandblasting menghasilkan kuat tekan sebesar 21,03 MPa pada usia beton 28 hari. Berdasarkan hal tersebut, pasir silika limbah sandblasting dapat berpotensi menjadi substitusi agregat halus pada beton HVFA dan termasuk ke dalam jenis beton mutu sedang yang dapat dimanfaatkan sebagai beton bertulang

Hand-worn Haptic Interface for Drone Teleoperation

Drone teleoperation is usually accomplished using remote radio controllers, devices that can be hard to master for inexperienced users. Moreover, the limited amount of information fed back to the user about the robot's state, often limited to vision, can represent a bottleneck for operation in several conditions. In this work, we present a wearable interface for drone teleoperation and its evaluation through a user study. The two main features of the proposed system are a data glove to allow the user to control the drone trajectory by hand motion and a haptic system used to augment their awareness of the environment surrounding the robot. This interface can be employed for the operation of robotic systems in line of sight (LoS) by inexperienced operators and allows them to safely perform tasks common in inspection and search-and-rescue missions such as approaching walls and crossing narrow passages with limited visibility conditions. In addition to the design and implementation of the wearable interface, we performed a systematic study to assess the effectiveness of the system through three user studies (n = 36) to evaluate the users' learning path and their ability to perform tasks with limited visibility. We validated our ideas in both a simulated and a real-world environment. Our results demonstrate that the proposed system can improve teleoperation performance in different cases compared to standard remote controllers, making it a viable alternative to standard Human-Robot Interfaces.Comment: Accepted at the IEEE International Conference on Robotics and Automation (ICRA) 202

PENGARUH SUBSTITUSI AGREGAT HALUS DENGAN PASIR SILIKA LIMBAH SANDBLASTING TERHADAP SIFAT FISIK DAN MEKANIK BETON HVFA

Pemanfaatan pasir silika limbah sandblasting sebagai agregat halus dan fly ash sebagai substitusi semen pada beton dapat mengurangi volume limbah di industri. Penelitian ini mengkaji sifat mekanik dan sifat fisik beton HVFA (High Volume Fly Ash) meliputi kuat tekan, porositas, densitas dan water absorption. Sifat-sifat tersebut memberikan indikasi kemudahan dimana cairan dapat masuk ke dalam dan bergerak melalui beton. Beton HVFA yang menggunakan agregat halus pasir biasa dengan substitusi fly ash terhadap semen sebesar 40% dibandingkan dengan beton normal. Selanjutnya, beton HVFA tersebut dibandingkan dengan beton HVFA dengan agregat halus yang disubstitusi pasir silika limbah sandblasting. Kuat tekan beton HVFA dengan pasir biasa ditemukan sebesar 44,8 MPa. Nilai ini lebih tinggi dibandingkan kuat tekan beton normal sebesar 33,2 MPa. Sedangkan beton HVFA dengan agregat halus pasir silika mempunyai kuat tekan 21,0 MPa. Porositas dan water abrosption beton HVFA dengan agregat halus pasir biasa lebih rendah dibandingkan dengan beton normal dan lebih tinggi jika dibandingkan dengan beton HVFA dengan agregat halus limbah sandblasting. Densitas beton HVFA dengan agregat halus pasir biasa ditemukan paling tinggi dibandingkan dua jenis beton yang lain. Hasil ini menunjukkan bahwa substitusi semen dengan fly ash memberikan dampak menaikkan kualitas beton, baik sifat fisik maupun mekanik. Di sisi lain, substitusi agregat halus dengan pasir silika limbah sandblasting menyebabkan penurunan kualitas beton, baik sifat fisik maupun mekanik

Call me Alix, not Elix: vowels are more important than consonants in own-name recognition at 5 months.

Consonants and vowels differ acoustically and articulatorily, but also functionally: Consonants are more relevant for lexical processing, and vowels for prosodic/syntactic processing. These functional biases could be powerful bootstrapping mechanisms for learning language, but their developmental origin remains unclear. The relative importance of consonants and vowels at the onset of lexical acquisition was assessed in French-learning 5-month-olds by testing sensitivity to minimal phonetic changes in their own name. Infants' reactions to mispronunciations revealed sensitivity to vowel but not consonant changes. Vowels were also more salient (on duration and intensity) but less distinct (on spectrally based measures) than consonants. Lastly, vowel (but not consonant) mispronunciation detection was modulated by acoustic factors, in particular spectrally based distance. These results establish that consonant changes do not affect lexical recognition at 5 months, while vowel changes do; the consonant bias observed later in development does not emerge until after 5 months through additional language exposure

ANALYTICAL METHOD BY HPLC-DAD ALLOWS QUANTIFICATION OF QUERCETIN MARKER IN STANDARDIZED EXTRACT OF ANADENANTHERA COLUBRINA VAR. CEBIL

Objective: The Anadenanthera colubrina (Vell.) Brennan var. cebil is a medicinal plant that has been used for the treatment of many diseases in the northeastern region of Brazil. This plant contains secondary metabolites such as quercetin, a flavonoid that is known by its antioxidant and anti-inflammatory effects. The aim of this work is to propose the validation of an analytical method using high-performance liquid chromatography with diode array detector (HPLC-DAD) for the quantification of quercetin and standardization of the hydroalcoholic extract (HAE) of A. colubrina.Methods: The A. colubrina extracts were prepared by the maceration process with powdered leaves at 20% weight: volume (w/v) and a hydroalcoholic solution at 50% volume: volume (v/v) for 120 h at room temperature. After pretreatment of the hydroalcoholic extract, the quercetin marker was used for quantification and proceeded to the evaluation of validation parameters for the method using HPLC-DAD.Results: The analytical method proved to be specific. Linear over the range 1.4–26.6 µg/ml, regression analysis showed a good correlation coefficient (R2= 0.999); the limit of detection (LOD) and the limit of quantification (LOQ) were 0.27 and 0.81 μg/ml respectively. The relative standard deviation (RSD) did not exceed 2.5% for precision. The proposed method was validated with an average recovery of 92.5–97.5%.Conclusion: The method was validated using HPLC-DAD, allowing the quantification of quercetin in the standardisation process of extracts and quality control of the herbal drug containing A. colubrina Phyto complex

Comparaison des races bovines Charolaise, Limousine et Maine-Anjou en race pure et en intercroisement 3. Performances d'abattage des taurillons purs et F1

Cette étude concerne les performances d’abattage à 15 et 18 mois de 219 taurillons issus d’un croisement diallèle entre les races Charolaise, Limousine et Maine-Anjou et de 24 taurillons Hereford. Les résultats des quatre races, des trois types génétiques croisés et d’hétérosis sont donnés pour le rendement d’abattage, la composition, la morphologie et la compacité de carcasse. Le rendement vrai de la race Limousine est nettement meilleur que celui des races Charolaise et Maine-Anjou (69,5 vs 67,8 et 66,8 points à 15 mois, 71,1 vs 68,3 et 67,2 points à 18 mois), la race Hereford étant très éloignée de celles-ci (63,6 et 64,2 points respectivement à 15 et 18 mois). Les écarts observés entre races pour la proportion de muscle de la carcasse sont très importants : respectivement 7,6 et 12,7 points à 15 et 18 mois entre les races Limousine et Hereford. A 15 mois, la Charolaise et la Maine-Anjou accusent pour le même critère des handicaps respectifs de 1,8 et 4,7 points sur la Limousine. Ces écarts sont plus importants à 18 mois : respectivement 3,3 et 7,4 points. Ces différences sont évidemment compensées par la proportion d’os mais surtout par celle du gras. La race Limousine présente en particulier une proportion de gras de carcasse identique à 15 et à 18 mois (12 points), alors que cette proportion augmente chez la Charolaise (12,4 à 13,9 points) et surtout chez la Maine-Anjou (14,5 à 17,5 points). La Hereford, qui a une proportion d’os proche de celle de la Charolaise, a des résultats très défavorables pour la proportion de gras de la carcasse (18,1 et 23,7 points respectivement à 15 et 18 mois). Le rapport muscle/os est significativement plus élevé chez la Limousine, intermédiaire chez la Charolaise et faible pour la Maine-Anjou et la Hereford. En terme de poids total de muscle, et grâce à sa supériorité de rendement d’abattage et de composition de carcasse, la race Charolaise compense complètement le handicap de croissance (Bonaïti et al., 1988) qu’elle a sur la Maine-Anjou ; la Limousine ne parvient à égaler ces deux races que peu avant 18 mois. Les effets d’hétérosis, obtenus pour l’ensemble des caractères, sont faibles et non significatifs.A total of 219 young bulls produced from a diallel cross between Charolais, Limousin and Maine-Anjou breeds as well as 24 Hereford purebreds were slaughtered, after fattening, at 15 or 18 months. Results of the four breeds, the three crosses and heterosis are given for killing out percentage, carcass composition and morphology. The Limousin breed gave a higher killing out percentage than Charolais and Maine-Anjou (69.5 vs 67.8 and 66.8 points at 15 months, 71.1 vs 68.3 and 67.2 at 18 months). Hereford gave a much lower killing out percentage (respectively 63.6 and 64.2 points at 15 and 18 months). Differences in muscle percentage were very large : respectively 7.6 and 12.7 points at 15 and 18 months between Limousin and Hereford. At 15 months, Charolais and Maine-Anjou were 1.1 and 4.7 points below Limousin ; these differences were larger at 18 months (3.3 and 7.4 points respectively). Fat proportion remained constant between 15 and 18 months for Limousin (12 points), but increased for Charolais (12.4 to 13.9 points) and still more for Maine-Anjou (14.5 to 17.5 points). Hereford had a very high fat proportion : 18.1 and 23.7 points respectively. The muscle/bone ratio was significantly higher for Limousin, intermediate for Charolais and similarly low for Maine-Anjou and Hereford. Muscle thickness of Limousin and Charolais was superior to both Maine-Anjou and Hereford. With respect to total muscle yield, the differences in dressing percentage and carcass composition offset the superiority of Maine-Anjou in growth at 15 and 18 months for Charolais and a little before 18 months for Limousin. Heterosis effects were small and not significant

Anxiety and hope: a study about the caregiver overload in the care of patients with stroke

Stroke involves injury to the central nervous system, presenting most frequently as cerebral infarction and intracerebral hemorrhage. It’s an important cause of disability worldwide, being associated with high burden to the patients’ caregivers, who are, frequently, family members. In that matter, it is reported that the main caregivers of stroke patients have the same, or even greater incidence of mental illnesses, such as depression and anxiety. Therefore, we present this study protocol aiming to observe the association between the patient’s type of stroke along with the severity of their sequelae, and the levels of anxiety and hope of their caregivers, in a descriptive, cross-sectional study with a quali-quantitative approach. For that purpose, patients of both sexes, over 18 years of age, who have had a stroke and are being followed up at the Cerebrovascular Diseases Ambulatory will be randomly selected. Then, data will be collected from the caregiver through questionnaires: Zarit Burden Interview (ZBI), Beck Hopelessness Scale (BHS), Beck Anxiety Inventory (BAI) and a socioeconomic questionnaire. The ZBI analyzes psychological, financial, social and physical aspects of the caregiver’s universe, while the BAI and BHS are used to quantify the caregiver’s anxiety state, and bring information about the individual’s hope and life expectations. Information about the patient will be obtained from medical records. Finally, we hope to find useful information for health services about the reality in which they are inserted, in order to promote the creation of disease prevention measures, which is essential to improve the quality of healthcare provided

THE STUDY OF THE ACUTE AND SUB-ACUTE ORAL TOXICITIES OF THE NEBULIZED EXTRACT OF MYRACRODRUON URUNDEUVA ALLEMÃO IN RABBITS

Objective: The aim of this research was to evaluate the acute and sub-acute oral toxicities of the nebulized dried extract of Myracrodruon urundeuva (NDEMU) leaf obtained by the spray drying technique on rabbits.Methods: In the acute toxicity study, the amount of nebulized dried extract (NDE) administered was adjusted to a dose of 2000 mg/kg of leaf powder of M. urundeuva to 6 rabbits once orally and were observed for 14 days. In the sub-acute study, the amount of NDEMU administered was adjusted to a dose of 2000 mg/kg/day of to 6 rabbits once daily for 30 day, orally. The appearance of toxic symptoms was observed every day, followed by each rabbits' food and drink intake. Haematological and biochemical analysis were observed and statistical analysis was performed on them. The rabbits were killed at the end of the study, and their organs were weighed and examined before organ histology were evaluated.Results: No toxic signs and no mortality were observed in the acute and sub-acute study. In the sub-acute study, the amount of dried extract administered was adjusted to a dose of 2000 mg/kg of leaf powder of M. urundeuva to 6 rabbits once daily for 30 days, orally. No toxic signs and no mortality were observed. There were no significant changes (p < 0.05) in the body weights, organ weights and haemato-biochemical parameters in any of the dose levels. No related histopathological lesions were observed.Conclusion: The results indicate that the treatment of repeated doses with the dried NDEME showed low toxicity in rabbits

STANDARDIZATION AND STABILITY EVALUATION OF DRY EXTRACTS OF MYRACRODRUON URUNDEUVA ALLEMÃO OBTAINED BY SPRAY DRIER

Objective: This study aimed to obtain standardised dry extracts of Miracrodruon urundeuva Allemão using spray-dryer and evaluate the stability of the extracts.Methods: It evaluated the drying parameters: Proportion of colloidal silicon dioxide (CSD) (10, 15 and 20%), inlet temperature (160, 170 and 180 °C) and feed rate (4, 6 and 8 ml/min). The study of the accelerated stability of dry extract occurred in temperature of 40 °C (±2 °C) and relative humidity of 75% (±5%) for 6 mo. The anti-inflammatory activity of the dry extract was evaluated in Swiss mice by the paw edema method.Results: Variations in drying conditions did not represent significant variations in yields of the process. The drying temperature and feed rate significantly influenced the concentration of quercetin (p≤0.05). The increase in inlet temperature and feed flow promoted the increase of quercetin concentration in the extracts. The stability study showed that the concentration of quercetin in dry extract was stable over a period of 6 mo. The dry extract showed anti-inflammatory activity in mice orally.Conclusion: A condition of 10% of colloidal silicon dioxide with an 180 °C inlet temperature and a feed rate of 8 ml/min was considered the most adequate for obtaining the extracts and the drying process resulted in stable dry extracts and the quercetin was a suitable biomarker for monitoring the process