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Mapping the modulating effect of transcutaneous auricular vagus nerve stimulation on voxel-based analyses in patients with first-episode major depressive disorder: a resting-state functional magnetic resonance imaging study
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He, Jia-Kai

; Li, Shao-Yuan

; Wang, Yu

; Zhao, Bin

; Xiao, Xue

; Hou, Xiao-Bing

; Zhang, Shuai

; Zhao, Ya-Nan

; Zhai, Wei-Hang

; Fang, Ji-Liang

; Rong, Pei-Jing

Brazilian Journal of Psychiatry

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apr 2023, Volume 45 N. 2 Pages 93 - 101

Abstract: En | Text: En | PDF: En

Introduction: Seed-based analysis has shown that transcutaneous auricular vagus nerve stimulation (taVNS) can modulate the dysfunctional brain network in patients with major depressive disorder (MDD). However, the voxel-based neuropsychological mechanism of taVNS on patients with first-episode MDD is poorly understood. The objective of this study was to assess the effects of an 8-week course of taVNS on patients with first-episode MDD. Methods: Twenty-two patients with first-episode MDD accepted an 8-week course of taVNS treatment. Resting-state functional magnetic resonance imaging (rs-fMRI) scans were performed before and after treatment. Voxel-based analyses were performed to characterize spontaneous brain activity. Healthy controls (n=23) were recruited to minimize test-retest effects. Analysis of covariance (ANCOVA) was performed to ascertain treatment-related changes. Then, correlations between changes in brain activity and the Hamilton Depression Rating Scale (HAM-D)/Hamilton Anxiety Scale (HAM-A) remission rate were estimated. Results: Significant group-by-time interactions on voxel-based analyses were observed in the inferior ventral striatum (VSi) and precuneus. Post-hoc analyses showed that taVNS inhibited higher brain activity in the VSi, while upregulating it in the precuneus. Functional connectivity (FC) between the VSi and precuneus decreased. Positive correlations were found between the HAM-D remission rate and changes in brain activity in the VSi. Conclusion: taVNS reduced the FC between VSi and precuneus by normalizing the abnormal spontaneous brain activity of VSi in first-episode MDD patients.

https://doi.org/10.47626/1516-4446-2022-2788

iPSCs ameliorate hypoxia-induced autophagy and atrophy in C2C12 myotubes via the AMPK/ULK1 pathway
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Cen, Haimei

; Fan, Pin

; Ding, Yuting

; Luo, Bin

; Luo, Hong

; Chen, Menglong

; Zhang, Yu

Biological Research

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2023, Volume 56 elocation 29

Abstract: En | Text: En | PDF: En

Abstract Background Duchenne muscular dystrophy (DMD) is an X-linked lethal genetic disorder for which there is no effective treatment. Previous studies have shown that stem cell transplantation into mdx mice can promote muscle regeneration and improve muscle function, however, the specific molecular mechanisms remain unclear. DMD suffers varying degrees of hypoxic damage during disease progression. This study aimed to investigate whether induced pluripotent stem cells (iPSCs) have protective effects against hypoxia-induced skeletal muscle injury. Results In this study, we co-cultured iPSCs with C2C12 myoblasts using a Transwell nested system and placed them in a DG250 anaerobic workstation for oxygen deprivation for 24 h. We found that iPSCs reduced the levels of lactate dehydrogenase and reactive oxygen species and downregulated the mRNA and protein levels of BAX/BCL2 and LC3II/ LC3I in hypoxia-induced C2C12 myoblasts. Meanwhile, iPSCs decreased the mRNA and protein levels of atrogin-1 and MuRF-1 and increased myotube width. Furthermore, iPSCs downregulated the phosphorylation of AMPKA and ULK1 in C2C12 myotubes exposed to hypoxic damage. Conclusions Our study showed that iPSCs enhanced the resistance of C2C12 myoblasts to hypoxia and inhibited apoptosis and autophagy in the presence of oxidative stress. Further, iPSCs improved hypoxia-induced autophagy and atrophy of C2C12 myotubes through the AMPK/ULK1 pathway. This study may provide a new theoretical basis for the treatment of muscular dystrophy in stem cells.

https://doi.org/10.1186/s40659-023-00435-4

Lower Body Perfusion Reduces the Morbidity of Postoperative Acute Kidney Injury in Type A Dissection: A Propensity-Matched Analysis
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Tang, Zhuo

; Lv, Ying

; Wang, Bin

; Yang, Zhonglu

; Liu, Yu

; Jiang, Hui

Brazilian Journal of Cardiovascular Surgery

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2023, N. ahead

Abstract: En | Text: En | PDF: En

ABSTRACT Introduction: Lower body perfusion (LBP) is a technique used to provide blood perfusion to distal organs and spinal cord during circulatory arrest. However, the effect of LBP on the prognosis of aortic arch surgery, especially on postoperative renal function, remains unclear. Methods: A total of 304 patients with acute type A aortic dissection who underwent total aortic arch replacement combined with frozen elephant trunk implantation between May 2016 and December 2021 were retrospectively analyzed. The patients were divided into LBP group (group L, n=85) and non-LBP group (group NL, n=219). Routine lower body circulatory arrest was applied during operation in group NL, and antegrade LBP combined was applied during operation in group L. Perioperative data were recorded. Propensity score matching was used for statistical analysis. Results: After propensity score matching, 85 pairs of patients were successfully matched. Two groups significantly differed in circulatory arrest time (six minutes vs. 30 minutes, P=0.000), cross-clamping time (101 minutes vs. 92 minutes, P=0.010), minimum nasopharyngeal temperature (29.4ºC vs. 27.2ºC, P=0.000), and highest lactate value during cardiopulmonary bypass (2.3 μmol/L vs. 4.1 μmol/L, P=0.000). Considering the postoperative indicators, the drainage volume (450 mL vs. 775 mL, P=0.000) and the incidence of level I acute kidney injury (23.5% vs. 32%, P=0.046) in group L was lower than those in group NL. Conclusion: LBP resulted as a safe and feasible approach in aortic arch surgery, as it could significantly shorten the circulatory arrest time, which might reduce the incidence of postoperative level I acute kidney injury.

https://doi.org/10.21470/1678-9741-2022-0190

Selection of key additive materials for white oil – based drilling fluids
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Qiao, Wei

; Fu, Long

; Sun, Xiuli

; Yu, Bin

; Yang, Peng

; Pan, Yi

; Tong, Le

Matéria (Rio de Janeiro)

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2023, Volume 28 N. 1 elocation e20220256

Abstract: En | Text: En | PDF: En

ABSTRACT The selection of key additive materials for a new type of oil-based drilling fluid was studied in this paper. The oil-based drilling fluid can strengthen well walls and ensure safety. It is suitable for high-temperature and high-pressure wells, deep wells and ultra-deep wells. A new type of high-temperature white oil-based drilling fluid was prepared by using 5# white oil as continuous phase, HIS as thickening agent, SDBS as emulsifier, and asphalt powder oxidized at 180°C as filtration agent. The results showed that the saturation concentration of sodium dodecyl benzene sulfonate (SDBS) was 4%, the saturation concentration of asphalt powder oxidized at 180°C was 4%, the saturation concentration of Tween-80 was 10%. The final resistance of high temperature and high pressure oil based drilling fluid formulation material is: No. 5 white oil + 4% SDBS + 5% modified bentonite + 4% asphalt powder oxidized at 180°C + 10% Tween-80 + 1.5% Barite + CaO. The performance evaluation of the new oil-based drilling fluid shows that shale expansion is 0.21mm, anti-temperature up to 220°C, and anti-pollution ability is good. The rheological properties, resistance of high-temperature high- pressure have been greatly improved. Therefore, the new white oil-based drilling fluid can resistance of high- temperature and also has low toxicity, which can meet the exploration and development of more complex wells.

https://doi.org/10.1590/1517-7076-rmat-2022-0256

Lower Body Perfusion Reduces the Morbidity of Postoperative Acute Kidney Injury in Type A Dissection: A Propensity-Matched Analysis
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Tang, Zhuo

; Lv, Ying

; Wang, Bin

; Yang, Zhonglu

; Liu, Yu

; Jiang, Hui

Brazilian Journal of Cardiovascular Surgery

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2023, Volume 38 N. 3 Pages 346 - 352

Abstract: En | Text: En | PDF: En

https://doi.org/10.21470/1678-9741-2022-0190

Abnormal expression of miRNA-122 in cerebral infarction and related mechanism of regulating vascular endothelial cell proliferation and apoptosis by targeting CCNG1
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Yu, Xiao-Juan

; Zhang, Tian

; Wei, Zeng-Zhen

; Gu, Bin

; Guo, Ting

; Jiang, Wen-Juan

; Shen, Yue-Qin

; Wang, Dong

; Wang, Qian

; Wang, Jun

Clinics

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2023, Volume 78 elocation 100199

Abstract: En | Text: En | PDF: En

Abstract Objective: To analyze the value of serum miRNA-122 expression in the diagnosis, severity, and prognosis of Acute Cerebral Infarction (ACI) and the correlation mechanism of serum miRNA-122 on the proliferation and apoptosis of vascular endothelial cells in ACI. Method: A total of 60 patients with ACI who were admitted to the emergency department of the Taizhou People’s Hospital from January 1, 2019, to December 30, 2019, and 30 healthy controls during the same period were selected. General clinical data of all patients at admission were collected. Including age, sex, medical history, and inflammatory factors (C-Reactive Protein [CRP], Interleukin-6 [IL-6], Procalcitonin [PCT], Neutrophil Gelatinase-Associated Lipid carrier protein [NGAL]). The National Institutes of Health Stroke Scale (NIHSS) score at admission and short-term prognosis (the Modified Rankin Score [mRS]) score at 3 months after onset were recorded. The expression level of miRNA-122 in the serum of patients with ACI and normal controls was detected by reverse-transcription quantitative Real-Time Polymerase Chain Reaction (RT-QPCR), and the correlation between the expression level of miRNA-122 in the serum of patients with ACI and the level of inflammatory factors, NIHSS and mRS scores were analyzed. The expression levels of miRNA-122 in the serum of patients with ACI, normal people, and Human Umbilical cord Endothelial Cells (HUVECs) cultured in a blank control group were detected by RT-QPCR and statistically analyzed. MTT and flow cytometry was used to compare the proliferation and apoptosis of vascular endothelial cells in the miRNA-122 mimics and inhibitors transfection groups and the corresponding negative control group. The mRNA and protein levels of apoptosis-related factors Bax, Bcl-2, Caspase-3, and angiogenesis-related proteins Hes1, Notch1, Vascular Endothelial Growth Factors (VEGF), and CCNG1 were detected by RT-QPCR and Western blot. Bioinformatics methods predicted CCNG1 to be the target of miRNA-122, and the direct targeting relationship between CCNG1 and miRNA-122 was verified by a dual-luciferase reporting assay. Result: Serum miRNA-122 expression in patients with ACI was significantly higher than that in healthy controls, with an area under the receiver operating characteristic curve of 0.929, 95% Confidence Interval of 0.875‒0.983, and an optimal cut-off value of 1.397. The expression levels of CRP, IL-6, and NGAL in patients with ACI were higher than those in healthy control groups, p < 0.05; miRNA-122 was positively correlated with CPR, IL-6, NIHSS score, and mRS score. At 48h and 72h, the proliferation rate of HUVECs cells in the miRNA-122 mimics group decreased and the apoptosis rate increased. Cell proliferation rate increased, and apoptosis rate decreased significantly in the groups transfected with miRNA-122 inhibitors. The mRNA and protein levels of pro-apoptotic factors Bax and caspase-3 were significantly increased in the miRNA-122 mimics transfection group, while those of anti-apoptotic factor Bcl-2 were significantly decreased compared to those of the control group. The expression of Bax and Caspase-3 decreased, and the expression of anti-apoptotic factor Bcl-2 increased in the transfected miRNA-122 inhibitors group. mRNA expression levels of Hes1, Notch1, VEGF, and CCNG1 in the miRNA-122 mimic transfected group were significantly decreased, while mRNA expression levels in the miRNA-122 inhibitors transfected group were significantly increased. Bioinformatics showed that there was a miRNA-122 binding site in the 3′UTR region of CCNG1, and dual luciferase assay confirmed that CCNG1 was the target of miRNA-122.

https://doi.org/10.1016/j.clinsp.2023.100199

miR-29c-3p represses the angiogenesis of esophageal squamous cell carcinoma by targeting SERPINH1 to regulate the Wnt signaling pathway
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Wei, Desheng

; Ma, Zhifeng

; Zhu, Ting

; Wang, Haiyong

; Wang, Bin

; Fu, Linhai

; Yu, Guangmao

Acta Cirúrgica Brasileira

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2023, Volume 38 elocation e385223

Abstract: En | Text: En | PDF: En

ABSTRACT Purpose: Esophageal squamous cell carcinoma (ESCC) is characterized by early metastasis and late diagnosis. miR-29c-3p is confirmed to repress angiogenesis in multiple tumor types. Yet, the functions of miR-29c-3p in the mechanism of ESCC angiogenesis, which were not sufficiently explored previously, were exactly what we investigated here at the molecular level. Methods: The mRNA level of miR-29c-3p and Serpin peptidase inhibitor clade H member 1 (SERPINH1) in ESCC tissues were assessed via bioinformatics analysis. Thereafter, miR-29c-3p and SERPINH1 (HSP47) mRNA level in ESCC cell lines was evaluated via quantitative real-time polymerase chain reaction. The effects of abnormal miR-29c-3p and SERPINH1 expression on ESCC cell viability, proliferation, migration, invasion, and HUVEC angiogenesis were examined via CCK8, colony formation, transwell, and angiogenesis assays, respectively. The protein levels of SERPINH1, vascular endothelial growth factor-A (VEGFA), Wnt-1, ?-catenin, and p-?-catenin were evaluated via Western blot. Expression of VEGFA secreted by ESCC cells was measured via enzyme-linked immunosorbent assay. Treatment with the Wnt activator BML-284 further revealed the way miR-29c-3p mediated the Wnt signaling pathway and its effects on angiogenesis. Results: Herein, we revealed a decrease of miR-29c-3p expression in ESCC tissues and cells, while the overexpressed miR-29c-3p could remarkably suppress ESCC cell progression, as well as HUVEC angiogenesis. Meanwhile, overexpressed miR-29c-3p notably downregulated VEGFA and repressed the Wnt signaling pathway. Treatment with the Wnt activator BML-284 could reverse the inhibition of HUVEC angiogenesis caused by miR-29c-3p. SERPINH1 was a downstream target of miR-29c-3p. SERPINH1 knockdown suppressed the malignant phenotypes of ESCC cells and impeded the Wnt signaling activation, while such suppression was reversed through miR-29c-3p inhibitor. Conclusions: We confirmed the mechanism that miR-29c-3p targeted SERPINH1, thus regulating angiogenesis in ESCC through the Wnt signaling pathway. It improves the understanding of angiogenesis in ESCC and offers new ideas for the research of ESCC treatment strategies in the future.

https://doi.org/10.1590/acb385223

Acupuncture for pregnancy-related pain in the lower back and posterior pelvic girdle pregnancyrelated pregnancy related
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Pai, Marcus Yu Bin

; Hohl, Adriano

; Souza, Luciano Ricardo Curuci de

; Mendes, Mara Valeria

; Sampaio, Luiz Carlos Souza

; Tsai, Andre Wan Wen

Revista da Associação Médica Brasileira

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2023, Volume 69 Suppl. 1 elocation e2023S101

Abstract: En | Text: En | PDF: En

https://doi.org/10.1590/1806-9282.2023s101

Development stage prediction of flat peach by SVR model based on changes in characteristic taste attributes
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TAN, Fengling

; ZHAN, Ping

; ZHANG, Yuyu

; YU, Bin

; TIAN, Honglei

; WANG, Peng

Food Science and Technology

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2022, Volume 42 elocation e18022

Abstract: En | Text: En | PDF: En

Abstract Prediction of the development stage of flat peach is very important to determine the harvest time and guarantee high quality peach fruit. The objective of this study was to predict the development stage of flat peach by applying the SVR model based on characteristic taste attributes changes. Seven development stages were divided into immaturity stage (F1-F5) and maturity stage (F6-F7) according to PIs analysis. Both human sensory evaluation and electronic tongue showed that sourness and bitterness significantly decreased, while sweetness increased during seven development stages (P < 0.05). PCA result revealed that sourness and sweetness attributes had a high correlation between human sensory evaluation and electronic tongue. HCA classified seven development stages as two clusters, which was consistent with the PIs analysis. Seven development stages of flat peach were accurately predicted by the SVR model and the correct rate (CR) was 93.9%. The mean squared error (MSE) of each evaluation index was around 0.14 and the squared correlation coefficient (SCC) was over 0.99, which indicated the model performed well. This study proved that taste attribute could be used as an index combined with the SVR model to accurately predict the development stage of flat peach.

https://doi.org/10.1590/fst.18022

10.

Clinical value of thalidomide on kk-rat model through TNF-a mediated inflammation approach
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HUANG, Min

; DUAN, Jie

; YU, Bin

; ZHENG, Si-lin

; CHEN, Qi

; LIN, Fei

; ZENG, Nan

; LING, Bao-dong

Food Science and Technology

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2022, Volume 42 elocation e06821

Abstract: En | Text: En | PDF: En

Abstract To observe the influence of thalidomide on tumor necrosis factor-a (TNF-α) of spontaneous type-2 diabetes rat (kk-Ay rat) model, and to explore the clinical value of TNF-a mediated inflammation approach to improve the injury on epithelial cell of kidney tubules. There are 30 kk-Ay rates being chosen to establish the Diabetic Nephropathy model and divided into thalidomide group and the model control group, 15 pieces for each group respectively. The levels of TNF-α, IL-1β, interleukin -6 (IL-6) and interleukin -18 (IL-18) of kk-Ay in the thalidomide group and the model control group were both at a higher level before treatment, but the difference was not statistically significant (P >0.05); The levels of TNF-α, IL-1β, interleukin -6 (IL-6) and interleukin -18 (IL-18) in kk-Ay rats 8/10/12 weeks after the treatment in the thalidomide group were significantly decreased, with statistically significant differences compared with the model control group (P < 0.05). The histopathological changes of kidney tubules epithelial cell injury on rats were observed through dissection. Thalidomide will effectively lower TNF-α and IL-1β expression levels in kk-Ay rat models, reduce inflammatory response, and thus improve damage on kidney tubules epithelial cell, which is worthy of further exploration and application.

https://doi.org/10.1590/fst.06821

11.

A Network Pharmacological Approach to Explore the Mechanisms of TongXieYaoFang in Inflammatory Bowel Disease
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You, Wenli

; Li, Mingjuan

; Di, Aiting

; Li, Xin

; Gao, Hairui

; Qiao, Cuixia

; Yu, Bin

; Zhao, Gang

Brazilian Journal of Pharmaceutical Sciences

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2022, Volume 58 elocation e201157

Abstract: En | Text: En | PDF: En

Abstract Inflammatory bowel disease (IBD) is a chronic inflammatory disorder of the intestine, demonstrating an increasing incidence every year. TongXieYaoFang (TXYF) has been used widely in China as a complementary therapy to relieve the symptoms of IBD for hundreds of years. In the present research, a network pharmacology-based approach was used to systematically explore the intrinsic mechanisms of TXYF in IBD at the molecular level. Network pharmacology-based methods, which mainly included database mining, screening of bioactive compounds, target prediction, collection of IBD-related targets, gene enrichment analysis, network construction, and molecular docking, were employed in the present study. Network analysis revealed a total of 108 potential targets derived from 22 component compounds of TXYF, among which 34 targets were common with the IBD-related targets. In the protein-protein interaction (PPI) network, 10 key targets were identified. The gene enrichment analysis suggested that anti-inflammatory processes, such as NF-kappa B signaling pathway and Toll-like receptor signaling pathway, could be the core processes involved in the action of TXYF in IBD. Molecular docking results revealed that three compounds present in TXYF exhibited strong binding affinity for PTGS2. The present study provides novel insights into the molecular mechanisms and network approaches of TXYF action in IBD from a systemic perspective. The potential targets and pathways identified in the present study would assist in further research on the clinical application of TXYF in IBD therapy.

https://doi.org/10.1590/s2175-97902022e201157

12.

Development of monoclonal antibody based IgG and IgM ELISA for diagnosis of severe fever with thrombocytopenia syndrome virus infection
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Zhang, Mei

; Du, Yanhua

; Yang, Li

; Zhan, Lin

; Yang, Bin

; Huang, Xueyong

; Xu, Bianli

; Morita, Koichi

; Yu, Fuxun

Brazilian Journal of Infectious Diseases

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2022, Volume 26 N. 4 elocation 102386

Abstract: En | Text: En | PDF: En

ABSTRACT Introduction: Severe fever with thrombocytopenia syndrome virus (SFTSV) is a newly emerged virus that poses a great threat to human health because of high fatality rate. Methods: To develop sensitive and specific sero-diagnostic systems for SFTSV infections, monoclonal antibodies (MAbs) against recombinant SFTSV nucleocapsid (rSFTSV-N) protein were developed by immunizing BALB/C mice with rSFTSV-N protein and fusing the spleen cells with SP2/0 myeloma cells. Three hybridoma cell lines secreting MAbs against rSFTSV-N were obtained. MAb based IgG sandwich enzyme linked immunosorbent assay (ELISA) and IgM capture ELISA systems were established by using the newly developed MAbs. One hundred fifteen clinical suspected SFTS patients serum samples were used to evaluate the newly established systems by comparing with the total antibody detecting sandwich ELISA system and indirect ELISA systems. Results: The MAbs based sandwich IgG ELISA was perfectly matched with that of the total antibody sandwich ELISA and the indirect IgG ELISA. IgM capture ELISA results perfectly matched with that of the total antibody sandwich ELISA while detecting eight additional positive samples missed by the indirect IgM ELISA. Conclusions: The MAbs against rSFTSV-N protein offer new tools for SFTSV studies and our newly developed MAb-based IgG and IgM capture ELISA systems would offer safe and useful tools for diagnosis of SFTS virus infections and epidemiological investigations.

https://doi.org/10.1016/j.bjid.2022.102386

13.

Exploring the five-paced viper (Deinagkistrodon acutus) venom proteome by integrating a combinatorial peptide ligand library approach with shotgun LC-MS/MS
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Nie, Xuekui

; He, Qiyi

; Zhou, Bin

; Huang, Dachun

; Chen, Junbo

; Chen, Qianzi

; Yang, Shuqing

; Yu, Xiaodong

Journal of Venomous Animals and Toxins including Tropical Diseases

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2021, Volume 27 elocation e20200196

Abstract: En | Text: En | PDF: En

Abstract Background Snake venoms are complex mixtures of toxic proteins or peptides encoded by various gene families that function synergistically to incapacitate prey. In the present study, in order to unravel the proteomic repertoire of Deinagkistrodon acutus venom, some trace abundance components were analyzed. Methods Shotgun proteomic approach combined with shotgun nano-LC-ESI-MS/MS were employed to characterize the medically important D. acutus venom, after collected samples were enriched with the combinatorial peptide ligand library (CPLL). Results This avenue helped us find some trace components, undetected before, in D. acutus venom. The results indicated that D. acutus venom comprised 84 distinct proteins from 10 toxin families and 12 other proteins. These results are more than twice the number of venom components obtained from previous studies, which were only 29 distinct proteins obtained through RP-HPLC for the venom of the same species. The present results indicated that in D. acutus venom, the most abundant components (66.9%) included metalloproteinases, serine proteinases, and C-type lectin proteins; the medium abundant components (13%) comprised phospholipases A2 (PLA2) and 5’-nucleotidases and nucleases; whereas least abundant components (6%) were aminopeptidases, L-amino acid oxidases (LAAO), neurotoxins and disintegrins; and the trace components. The last were undetected before the use of conventional shotgun proteomics combined with shotgun nano-LC-ESI-MS/MS, such as cysteine-rich secretory proteins Da-CRPa, phospholipases B-like 1, phospholipases B (PLB), nerve growth factors (NGF), glutaminyl-peptide cyclortransferases (QC), and vascular non-inflammatory molecules 2 (VNN2). Conclusion These findings demonstrated that the CPLL enrichment method worked well in finding the trace toxin proteins in D. acutus venom, in contrast with the previous venomic characterization of D. acutus by conventional LC-MS/MS. In conclusion, this approach combined with the CPLL enrichment was effective for allowing us to explore the hidden D. acutus venomic profile and extended the list of potential venom toxins.

https://doi.org/10.1590/1678-9199-jvatitd-2020-0196 92 downloads

14.

Baryon Acoustic Oscillations from Integrated Neutral Gas Observations: an instrument to observe the 21cm hydrogen line in the redshift range 0.13 < z < 0.45 – status update
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WUENSCHE, CARLOS A.

; ABDALLA, ELCIO

; ABDALLA, FILIPE

; BAROSI, LUCIANO

; WANG, BIN

; AN, RUI

; BARRETOS, JOÃO A. M.

; BATTYE, RICHARD

; BRITO, FRANCISCO A.

; BROWNE, IAN

; CORREIA, DANIEL

; COSTA, ANDRÉ A.

; DELABROUILLE, JACQUES

; DICKINSON, CLIVE

; FENG, CHANG

; FERREIRA, ELISA G. M.

; FORNAZIER, KARIN

; DE GASPERIS, GIANCARLO

; GUTIERREZ, PRISCILA

; HARPER, STUART

; LANDIM, RICARDO G.

; LICCARDO, VINCENZO

; MA, YIN-ZHE

; MACHADO, TELMO

; MAFFEI, BRUNO

; MARINS, ALESSANDRO

; MENDES, MILENA M. M.

; MERICIA, EDUARDO

; MONSTEIN, CHRISTIAN

; MOTTA, PABLO

; NOVAES, CAMILA

; OTOBONE, CARLOS H.

; PEEL, MICHAEL

; QUEIROZ, AMILCAR R.

; RADCLIFFE, CHRISTOPHER

; REMAZEILLES, MATHIEU

; RIBEIRO, RAFAEL M. G.

; SANG, YU

; SANTOS, JULIANA F. R.

; SANTOS, LARISSA

; SANTOS, MARCELO. V.

; SHAN, CHENXI

; SILVA, GUSTAVO B.

; VIEIRA, FREDERICO

; VIEIRA, JORDANY

; VILLELA, THYRSO

; XIAO, LINFENG

; YANG, WEIQIANG

; ZHANG, JIAJUN

; ZHANG, XUE

; ZHU, ZENGHAO

Anais da Academia Brasileira de Ciências

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2021, Volume 93 elocation e20201096

Abstract: En | Text: En | PDF: En

Abstract BINGO (BAO from Integrated Neutral Gas Observations) is a unique radio telescope designed to map the intensity of neutral hydrogen distribution at cosmological distances, making the first detection of Baryon Acoustic Oscillations (BAO) in the frequency band 980 MHz - 1260 MHz, corresponding to a redshift range 0.127 < z < 0.449. BAO is one of the most powerful probes of cosmological parameters and BINGO was designed to detect the BAO signal to a level that makes it possible to put new constraints on the equation of state of dark energy. The telescope will be built in Paraíba, Brazil and consists of two \thicksim 40m mirrors, a feedhorn array of 50 horns, and no moving parts, working as a drift-scan instrument. It will cover a 15 ^{\circ} ∘ declination strip centered at \sim \delta ∼ δ =-15 ^{\circ} ∘, mapping \sim ∼ 5400 square degrees in the sky. The BINGO consortium is led by University of São Paulo with co-leadership at National Institute for Space Research and Campina Grande Federal University (Brazil). Telescope subsystems have already been fabricated and tested, and the dish and structure fabrication are expected to start in late 2020, as well as the road and terrain preparation.

https://doi.org/10.1590/0001-3765202120201096 413 downloads

15.

Ballistic gelatin Lagrange Mooney-Rivlin material model as a substitute of bird in finite element bird strike case studies
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Aslam, Muhammad Azeem

; Rayhan, Saiaf Bin

; ke, Zhange

; Yu, Wang Jing

Latin American Journal of Solids and Structures

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2020, Volume 17 N. 6 elocation e298

Abstract: En | Text: En | PDF: En

Abstract Numerical simulation plays a crucial role in today’s aviation industry. Modern computers with the latest commercial FE codes have fueled the triumph of establishing simulation as a prerequisite of aerostructure part design from micro modeling of materials to large-scale structural analysis. In this current research paper, a Mooney-Rivlin material model of ballistic gelatin with Lagrange code is analyzed as a potential candidate for the computational bird model to simulate bird strike case studies. To investigate the practicability, the model is compared with other established Lagrange and SPH EOS models for both rigid and deformable body impacts along with experimental data found in the literature adopting explicit solver Ansys Autodyn. Despite some discrepancies found during rigid body impacts, deformable plate impacts confirm the robustness of the model with significantly faster computation time. Besides, the biggest criticism of the Lagrange model, mesh distortion problem as fluid during bird strike case studies is efficiently tackled by adopting the node erosion algorithm as an effective technique to solve Lagrange bird models without affecting the outcome of the solutions.

https://doi.org/10.1590/1679-78256215 799 downloads

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