bluuebunny/crossref_metadata_2025 huggingface dataset:
Public Health Crisis of Anemia in India: Retrospective Study of Hemoglobin Levels and Impact of Medication Intervention in a School Setting
Authors: Bansal Riya , Frank Aaron , Madhani Smeet , Aledia Anna , Park Drew , Kundaria Bhanji , Bera Rimal , Bera Kevin , Amin Alpesh
Published: May 2023

Background
Anemia has been a pervasive and constant public health crisis in India. Anemia’s prevalence in rural areas is 79% in children and 49.5% in women. A large survey of adolescent girls reported an anemia prevalence of 89%, of which 56% have iron deficiency anemia. The objectives of this study are to understand the prevalence of iron deficiency anemia in children and women from rural villages in India and the impact of a medication and health education intervention on hemoglobin levels, utilizing an existing local community structure of a boarding school.
Methods
Retrospective study of de-identified hemoglobin data originally collected during a public health clinical care investigation was performed to understand the prevalence of anemia in women and children in rural villages. Participants gave blood samples to measure hemoglobin levels. Analysis of health education and medication intervention consisting Albendazole 200 mg and Autrin Capsule tablets containing cyanocobalamin vitamin B12 (0.1% in gelatin), ferrous fumarate (98.6 mg of elemental iron), and folic acid with lemon water given to 275 female students at Kaneria Boarding School was performed to understand the impact of intervention on hemoglobin levels.
Key Results
Utilizing the World Health Organization (WHO) anemia classification, prevalence of moderate and severe anemia ranged 20-60% amongst women and children. Results from an interventional study showed a statistically and clinically significant increase in hemoglobin levels of 2.848 (p<0.05) in 10th grade and 2.423 (p<0.05) in 12th grade students.
Conclusions
Understanding the prevalence of anemia in rural regions in India is imperative to focusing therapies targeting iron deficiency anemia. Results of an interventional study utilizing existing community structures such as a school holds promise for future wide-scale iron deficiency anemia interventions.
Socio-economic contributions and challenges of urban agriculture practice in Ethiopia
Authors: Gibtan Ashagrie , Abera Wondosen , Delelegn Mekuria , Maru Molla , Emiru Adamu
Published: May 2023

The study was conducted to make situational analysis of UA and its implication for socioeconomic improvement for urbanites in Addis Ababa and other four selected regional towns of Bahir Dar, Hawas, Adama and Bishoftu. The study also tried to draw policy implications for demystifying UA in Ethiopia. On the other hand both primary and secondary data was accessed through questionnaire, key informant interviews, focus group discussions and field observation and reviews of published and unpublished materials. The findings of this study show that, urban agriculture benefits the urban residents in general and the practitioners in particular in different was. UA member households are able to have access to fresh and nutrient-dense food and greater dietary diversity. This implies that UA practice has a significant contribution in improving the food security of the UA farmers. The study also indicated that UA practice in Ethiopia has a significant contribution in enhancing practionners income and in turn improving living standard.
Transcriptome analysis of Long non-coding RNAs altered in sciatic nerves of aging SD rats
Authors: Wu Guanggeng , Kuang Rui , Zhang Yi , Zhu Zhaowei , Xu Shuqia , Liu Xiangxia , Xu Yangbin , Luo Yunxiang
Published: May 2023

Objectives
To investigate the long non-coding RNAs (lncRNAs) and messenger RNAs (mRNAs) changes in the sciatic nerve (SN) in Sprague Dawley (SD) rats during aging.
Methods
Eighteen healthy SD rats were selected at the age of 1 month (1M) and 24 months (24M) and SNs were collected. High-throughput transcriptome sequencing and bioinformatics analysis were performed. Protein-protein interaction (PPI) networks and competing endogenous RNA (ceRNA) networks were established according to differentially expressed genes (DEGs).
Result
As length of lncRNAs increased, its proportion to the total number of lncRNAs decreased. A total of 4079 DElncRNAs were identified in Con vs 24M. GO analysis were primarily clustered in nerve and lipid metabolism, extracellular matrix, and vascularization related fields. There were 17 nodes in the PPI network of the target genes of up-regulating genes including Itgb2, Lox, Col11a1, Wnt5a, Kras, etc. Using quantitative RT-PCR, microarray sequencing accuracy was validated. And there were 169 nodes constructing the PPI network of down-regulated target genes, mainly including Col1a1, Hmgcs1, Hmgcr. CeRNA interaction networks were constructed.
Conclusion
Lipid metabolism, angiogenesis and ECM fields might play an important role in senescence process in SNs. Col3a1, Serpinh1, Hmgcr, Fdps could be candidates for nerve aging research.
Study on grain production efficiency and its influencing factors in the Yangtze River Economic Belt based on grey water footprint
Authors: Wei Shenghui , Wang Mengwei , Zhang Degang
Published: May 2023

Water is the key to grain production, and water pollution is an increasingly serious constraint on grain production. Based on the grey water footprint theory, this paper constructed an super-efficient SBM model containing unexpected output to measure the grain production efficiency of 110 cities in the Yangtze River Economic Belt from 2006 to 2020. The Dagum Gini coefficient and kernel density estimation methods were used to investigate its dynamic evolution trend, and the driving factors were analyzed by the spatial econometric model. The findings are as follows: (1) The overall level of grain production efficiency in the Yangtze River Economic Belt is not high, showing a trend of first fluctuating growth and then decreasing during the sample period. (2) There are differences in the distribution dynamics of grain production efficiency in the three regions of the Yangtze River Economic Belt, with the largest difference in grain production efficiency in the upper reaches, followed by the lower reaches and the middle reaches of the Yangtze River. (3) There is a spatial spillover effect of grain production efficiency in the Yangtze River Economic Belt, but the overall coordinated development is not strong, and the driving effect of high-efficiency cities on the grain production efficiency of low-efficiency cities is not enough. (4) Economic and financial development plays a significant role in promoting grain production efficiency in the Yangtze River Economic Belt, while fiscal support for agriculture has a negative impact. Finally, the paper puts forward some suggestions to improve grain production efficiency in the Yangtze River Economic Belt.
Characterization and seismic hazard in the Coquimbo Region, Chile: A probabilistic study
Authors: Ojeda Valentina , Vega-Jorquera Pedro , Barra Erick , Palma-Chilla Luis , Vidal Luis , Saavedra José , Pizarro Alfredo
Published: May 2023

In order to characterize seismically the Coquimbo Region, Chile, data from 1943 to 2020 were considered. The region was divided into 30 zones of 0.5 • latitude and 0.5 • longitude and the non-extensive statistical physics was used. Both, the Sotolongo-Costa-Posadas and Mathai models were proposed to analyze the magnitude-frequency distribution. The subdivision into cells of the catalog allowed to demonstrate that systems with value of q ∼ 1 present exponential behavior, while with the superposition of subsystems it was expected to obtain q > 1, supporting the su-perstatistical model. Thus, by subdividing the Coquimbo region into the South and North regions, we find that in both the entropic index is greater than one, q > 1, however , according to the value obtained, in the southern sector the long-range effects are greater than in the northern sector. This means that both sectors ae well described by the nonextensive statistical model, either by SCP model or Mathai model; the entropic index is q > 1 and in both cases R 2 > 0.99. As the Coquimbo region is considered as a all, the nonextensive statistical distribution is the more adequated. With respect to the probabilistic seismic hazard assessment, we showed that the Mathai’s model has the better fit. Thus, in the frequency-interevent time distribution was used for different limite magnitudes values. Our analysis shows that the probability occurrence of an seismic event in the northern sector of the region is lower than in the southern sector for the same period; in the former the behavior is of Poissonian type. Thus, the region’s northern and southern zones show different behaviors in terms of earthquake occurrence probability.
3D-Printed helmet-type Neuro-navigation approach (I-Helmet) for transcranial magnetic stimulation
Authors: Wang He , Cui Dong , Jin Jingna , Wang Xin , Li Ying , Liu Zhipeng , Yin Tao
Published: May 2023

Neuro-navigation is a key technology to ensure the clinical efficacy of TMS. However, the neuro-navigation system based on positioning sensor is currently unable to be promoted and applied in clinical practice due to its time-consuming and high-cost. In the present study, we designed I-Helmet system to promote an individualized and clinically friendly neuro-navigation approach to TMS clinical application. I-Helmet system is based on C + + with a graphical user interface that allows users to design a 3D-printed helmet model for coil navigation. Besides, a dedicated coil positioning accuracy detection method was promoted based on three-dimensional (3D) printing and 3D laser scanning for evaluation. T1 images were collected from 24 subjects, and based on each image, phantom were created to simulate skin and hair. Six 3D-printed helmets with the head positioning hole enlarged by 0–5% tolerance in 1% increments were designed to evaluate the influences of skin, hair, and helmet-tolerance on the positioning accuracy and contact force of I-Helmet. Finally, I-Helmet system was evaluated by comparing its positioning accuracy with three skin hardnesses, three hair styles, three operators, and with or without landmarks. The accuracy of the proposed coil positioning accuracy detection method was about 0.30 mm in position and 0.22° in orientation. Skin and hair had significant influences on positioning accuracy (p < 0.0001), whereas different skin hardnesses, hair styles, and operators did not (p > 0.05). The tolerance of the helmet presented significant influences on positioning accuracy (p < 0.0001) and contact force (p < 0.0001). The positioning accuracy significantly increased (p < 0.0001) with landmark guided I-Helmet. 3D-printed helmet-type Neuro-navigation approach (I-Helmet) with 3% tolerance and landmarks met the positioning requirements for TMS in clinical practice with less than 5 N mean contact force, 3–5 mm positioning accuracy, 65.7 s mean operation time, and 50-yuan material cost.
Android-based Home Security Application
Authors: Sukri Khairul Amin Bin Mohamad
Published: May 2023

As the development of technology keeps on growing rapidly, the use of smart technology in our daily life is getting demand. The Android-based Home Security Application was developed to ease users to know the current situation regarding their house at any time they want especially when they are away from home. This project uses a motion detection sensor to detect a moving entity in the area where the system is deployed. The motion detection sensor and alarm system that is implemented in the application system will enable users to know the real situation that may happen at that time. As a result of the project, the user can use the application to view the current situation of their house and an alert message will be notified via the application system if a motion is detected especially when they are away. It is to ensure the users know the current situation in their house. In terms of security, the combination of the motion sensor and alarm system in this project may be more reliable and secure with the neat and straightforward user interface that may ease users to navigate around the application system.
A CFD Modeling Examining the Distance between Propellers in a Mixing Tank Equipped with Two Propellers Using FLUENT Software
Authors: MollaHajizadeh Reza
Published: May 2023

In this paper, a three-dimensional (3D) simulation of turbulent flow in stirred tanks with a mechanical stirrer is investigated by Fluent software. The stirrer used in this tank is a PBT turbine type with an angle of 45°, which spreads the flow radially and axially. In this study, the RNG k-ε model is used for simulation. Also, the effect of the distance between two propellers has been investigated in baffled agitator tanks equipped with two propellers. For this purpose, two tanks with baffled stirrers, in which the distance between the two impellers and the distance of the lower impeller from the bottom of the tank are different (150 mm and with a shaft height of 495 mm) have been examined, and compared. But the distance of the lower turbine from the bottom of the tank and the distance between the two turbines in the two tanks are different. The stirrer used in both tanks is PBT type. In general, this research aims to compare the effect of the distance between two turbines on axial, radial, and angular velocities, the kinetic energy of turbulence (k), and the magnitude of velocity in different places in two investigated tanks. Also, the analysis of numerical results in speed contour, turbulence intensity and speed vector has been investigated.
Evaluation of radiofrequency ablation for papillary thyroid microcarcinoma with trachea-adjacent location versus trachea-distant location: a propensity score matching study
Authors: Jing Haoyu , Yan Lin , Xiao Jing , Li Xinyang , Jiang Bo , Yang Zhen , Li Yingying , Zhang Mingbo , Luo Yukun
Published: May 2023

Purpose
To evaluate the outcomes of radiofrequency ablation (RFA) for papillary thyroid microcarcinoma (PTMC) adjacent to the trachea and compare those with PTMC distant from the trachea.
Methods
This retrospective study reviewed patients who underwent RFA for solitary low-risk PTMC between June 2014 and July 2020. Patients were categorized into A group (PTMC adjacent to the trachea) (n = 211) and D group (PTMC distant from the trachea) (n = 790). The volume, volume reduction ratio (VRR), tumor disappearance, complication, and disease progression were assessed and compared between groups. Factors affecting disease progression were evaluated by Cox regression analysis.
Results
After a mean follow-up time of 30.0 ± 16.5 months, the overall VRR and tumor disappearance rate were 99.2 ± 4.6% and 87.5%, respectively. After propensity score matching, no significant differences were observed between the groups in the latest volume (0.8 ± 4.0 mm3 vs 0.6 ± 3.5 mm3, p = 0.631), VRR (99.5 ± 2.3% vs 99.5 ± 2.8%, p = 0.638), and tumor disappearance rate (87.6% vs 88.0%, p = 0.845). In addition, no differences could be found between groups in the incidence of disease progression (2.9% vs 3.3%, p = 0.624) and complication (0.5% vs 0.5%, p = 1.000). Tracheal adjacency was not associated with disease progression (p = 0.671).
Conclusion
RFA is an effective and safe alternative approach for eligible patients with PTMC located adjacent to the trachea and PTMC distant from the trachea.
Association between continuity of care and attendance of post-discharge follow-up after psychiatric emergency presentation
Authors: Wong Ben Hoi-ching , Chu Petrina , Calaminus Paul , Lavelle Cathy , Refaat Rafik , Ougrin Dennis
Published: May 2023

Background
The number of accident and emergency (A&E) hospital attendances by young people aged 18 or under with a recorded diagnosis of a psychiatric condition more than tripled between 2010 and 2022. After discharge from the hospital, attendance at follow-up appointments in the community is critical to ensure the safety of young people and optimise the use of clinical resources
Aims
To evaluate the association between follow-up attendance and the continuity of clinicians and clinical teams.
Method
A retrospective cohort study was conducted using electronic clinical record data from East London NHS Foundation Trust (ELFT), between April 2019 and March 2022. Multi-level mixed effects logistic regression was performed to model the follow-up attendance odds based on whether the same or different clinician and clinical team offered the initial A&E and the community follow-up appointment or whether a crisis team was involved.
Results
3134 A&E presentations by 2368 young people were identified within the study period. Following these presentations, 2091 follow-up appointments in the community were offered. The attendance rate increased by more than three times if the follow-up appointment was offered by the same clinician who saw the young person in A&E (odds ratio (OR) = 3.66; 95% CI 1.65–8.13). Whether the same clin ical team provided the community follow-up appointment, or whether a crisis team was involved before discharge made no difference to the likelihood of follow-up attendance.
Conclusions
The findings support the importance of the continuity of clinicians in the care of young people in crisis. Crisis service planners and policymakers should prioritise the continuity of clinicians in mental health service models and rota planning.
Effects of in vitro testing of glycyrrhetinic acid (GA) on the lipid metabolism of channel catfish (Ictalurus punctatus) fed a high-fat diet
Authors: Desouky Hesham Eed , Jiang Guang-zhen , Abasubong Kenneth Prudence , Dai Yong-Jun , Yuan Xiangyang , Adjoumani Jean-Jacques Y. , Liu Wen-bin
Published: May 2023

Fatty liver always strongly correlates with low growth and reduced harvest yield. However, some herbs in China can reduce the storage of hepatic fat. This study aimed to examine the lipid-lowering effect of glycyrrhetinic acid (GA) in channel catfish (Ictalurus punctatus) in vitro. Two different methods were performed to measure the effect of GA on the metabolism of fats in the fingerling of catfish.
First method: GA was injected directly into the abdominal cavity, where fish were fed on a high-fat diet with different time points (0H, 3H, 6H, 12H, 18H, 24H & 36H), and the highest TG level was found at 18 hours so this time was chosen to treat with GA. The fish were then injected with five levels of GA (0, 0.15, 0.3, 0.6, 1.2 mg/kg) in two diet groups of fish; normal-fat diet (ND) and high-fat diet (HFD). Injections of GA in channel catfish enhanced plasma and liver TC, TG, HDL & LDL, and lipid metabolism gene expression compared to HFD and ND. Nevertheless, treatment with GA significantly decreased gene expression of inositol requiring enzyme 1 (IRE1), spliced X box-binding protein 1 (xbp1s), DnaJ heat shock protein family (Hsp40) member B9 (DNAJB9), and glucose-regulated protein 78 (GRP78), an increased level of gene expression of MTTP and Apolipoprotein B(ApoB) in both ND groups and HFD groups. The best results of lipid profile parameters and gene expression of lipid metabolism genes have been observed at the injection level of 0.3 mg/kg GA both in ND and HFD.
Second method: cell culture of catfish hepatopancreas, five different levels of GA (0 - 0.15 - 0.3 - 0.6 - 1.2) μMwere tested with oleic acid (OA) as a fat source with a concentration of 0.4 mM. The use of GA with OA in cell culture led to reduced IRE1, xbp1s, DNAJB9, and GRP78 and increased MTTP & ApoB expression levels, while the opposite was observed when treated with OA alone. The best expression level was at a concentration of 0.3 μM GA. In conclusion, a high-fat diet could lead to aberrant lipid secretion by activating the IRE1/XBP1 pathway. However, adding GA restored this parameter to the normal level.
The salivary microbiome as a diagnostic biomarker of health and periodontitis: a large-scale meta-omics analysis before and after the removal of batch effects
Authors: Regueira-Iglesias Alba , Blanco-Pintos Triana , Relvas Marta , Alonso-Sampedro Manuela , Balsa-Castro Carlos , Tomás Inmaculada
Published: May 2023

Background
Methodological differences in 16S rRNA sequencing studies have significant effects on the diversity of the results obtained, making comparisons in the form of traditional reviews controversial. This meta-omics study applies the best practices based on the available evidence and employs sequences from different Illumina V3-V4 bioprojects. The goal is to evaluate the salivary microbiota at the amplicon sequence variant (ASV) level in terms of differential proportionality and predictive models. This is done in periodontally healthy and untreated periodontitis patients, both before and after the removal of batch effects (BEs).
Results
Before the removal of BEs, 265 ASVs from 115 species (2.69% and 20.07% of the totals detected, respectively) revealed significant differences in their centred log-ratio abundance values for healthy and diseased patients. After their removal, this number fell to 190 ASVs from 94 species (1.93% and 16.40%), with 148 ASVs from 75 species (1.50% and 13.09%) common to those obtained before removal. In the predictivity analysis, models constructed before BEs removal using all the samples (796) consisted of 16 ASVs (0.16%) and had an area under the curve (AUC) of 0.944; models built using two-thirds of the specimens (training = 531) comprised 35 ASVs (0.36%) and had an AUC of 0.955 after being validated on one-third of the samples (test = 265). After BEs removal, these figures deteriorated - the models required more ASVs (all = 200 − 2.03%; training = 100 − 1.01%) and had slightly lower AUC (all = 0.935; test = 0.947).
Conclusions
Nearly half of the differential proportionality relationships before the exclusion of BEs were spurious. Although removing them reduced the number of ASVs with differential proportionality for health and periodontitis by approximately one-third, almost twelve (all samples) and three (training/test) times as many predictive ASVs were required to distinguish between clinical conditions than before the BEs exclusion. Nevertheless, both before and after their eradication, all models suggested that saliva has relevant value as a biomarker for diagnosing health and periodontitis, with a small percentage of salivary taxa having an outstanding capacity to discriminate between these conditions. The main health-predictor ASV was Streptococcus oralis dentisani-AV1042; for periodontitis, these were Fusobacterium nucleatum vincentii-AV10, Mycoplasma faucium-AV213, Parvimonas HMT110-AV21, Treponema denticola-AV38, and Tannerella forsythia-AV15.
Development and analysis of polymer-based wave spring response with different infill density
Authors: M Venkata Subramanian , Gouda Krushna
Published: May 2023

The development of wave spring has enhanced performance characteristics like load bearing capability, stiffness, energy absorption and energy release technique in a constrained space. The wave springs can be developed by considering the number of turns, waves, thickness, which can be easily adjusted to accommodate stronger force and to meet specific technical requirements as per the area of applications. Wave springs are complex in design and can be fabricated by additive manufacturing technique. Advanced manufacturing methods provides full design freedom to develop the wave spring of various geometry. Present work is focused to evaluate the Polypropylene wave spring stiffness and its load bearing capacity, which may be helpful in the application of smooth landing of drones and robotic structures, mechanical pressure valves and washers. Limited study of the polymer-based wave spring properties and its material behavior has been studied. The contemporary work establishes the computational and experimental analysis of crest-to-crest wave springs which are designed with honeycomb infill pattern with infill density of 100%, 90% and 80%. Maximum load bearing capacity and stiffness of the different designed wave springs are obtained through universal testing machine. From the experimental results the average load bearing capacity of PP 100%, PP 90% and PP 80% at 75% of compressible distance of crest-to-crest wave spring from cycle 1 to 10. The results of the 1st cycle load bearing capacity are 234.075 N, 181.31 N and 178.58N respectively.
Studying the awareness of early detection of cervical cancer by conducting a cervical smear in Damascus and its countryside
Authors: Abdeen Dana Ahmad , Alreffaie Maram Musaad , Sakka Kanaan
Published: May 2023

Introduction: The Pap smear is a reliable, inexpensive, and effective screening test for cervical cancer; Cervical cancer is the most common type of cancer among women worldwide. This study aims to assess knowledge and awareness about early detection of cervical cancer among a sample of women in Syria and its association with social and demographic characteristics.Materials and Methods This cross-sectional study was conducted between January and March 2023 using the appropriate sampling pattern among a sample of women from the governorates of Damascus and Damascus countryside. The inclusion criteria included Syrian women 18 years and over, who were able to read and understand the questionnaire and fill it out completely. A self-administered and filled-out questionnaire in Arabic was used that included questions about demographic information, questions about awareness about early detection of cervical cancer using a Pap smear, and questions about behavioral intention. To do a cervical smear in the future. The chi-square test was used to study the relationship between the qualitative variables of the study and the degree of awareness about early detection of cervical cancer.Results Out of 1000 women who participated in the study, most of them were 40 years old and over, 39.8%, and 31–39 years old, 26.8%. 9.8% of the sample reported having sexually transmitted diseases before, of whom 71.1% reported having gonorrhea, 16.5% with chlamydia, and 6.2% with genital herpes. 33% knew that the Pap smear is the most useful way to detect cervical cancer. And 40.4% answered that women should undergo a cervical examination at least every three years. The degree of awareness was weak at 75.8%, and 53.2% showed a weak behavioral intention to conduct a Pap smear in the future.Conclusion The results of this study indicate that women's awareness and behavior towards Pap smear is insufficient and needs to be strengthened. Given the main reason participants cited for not having the test, all healthcare providers should educate and encourage women to have regular Pap smears. This is done through awareness campaigns, scientific seminars, and social media.
Does Higher Education Influence on Women Empowerment? - A Perceptual Study
Authors: Kulal Abhinandan , N Abhishek , Kumar Sanath , P Gururaj
Published: May 2023

In today’s world higher education is crucial not only as a source of knowledge but also as a means to increase one’s employability. Even though this statement holds good for both men and women, higher education has a more predominant role in the life of woman because higher education not only promotes the financial stability of women but also boost self-confidence and independence in her personality. In order to understand to what extent higher education influences the various aspects of women empowerment namely Social, Psychological, Economic, Political and Educational, a perceptual study of women with higher education has been undertaken in Karnataka. A multiple regression analysis was used to check the influence of higher education on women empowerment and depicted the path analysis using Structured Equation Model. The study revealed that higher education significantly influences the overall empowerment of women and it also exhibited that there is no association between women’s perception on overall empowerment among demographic parameter except monthly income.
Different Fluorine Content of Poly(aryleneetherketone) Coated on Polyimide Films to Fabricate Hydrophobic and Low Moisture Absorption Films
Authors: Su Jing , Fan Xin , Zhou Han , Jiang Zhenlin , Zhu Min
Published: May 2023

Polyimides have attracted considerable attention owing to their excellent properties; however, their hydrophilicity makes them susceptible to hydrolytic degradation. In this study, polyaryletherketones (PAEKs) with different fluorine contents were coated onto the surface of the polyimide films to fabricate the hydrophobic surface. The wettability of the films changed, with a transition from hydrophilicity to hydrophobicity, upon coating with PAEKs. Thus, the coated films exhibited low moisture absorption. Due to the excellent thermal stability of fluorinated polyaryletherketones (F-PAEKs), the coated polyimide films retained their hydrophobicity even after extreme treatment. Furthermore, the dielectric properties of the coated polyimide film were superior to those of the unmodified film. The hydrophobic polyimide film can meet the requirements of extreme environments.
Research on the influence of high temperature oxidation environment on the properties of C/C composite material
Authors: Zhou Jingyi , Tan Zhihong , Shi Jiale
Published: May 2023

In this paper, the influence of extreme service environment on the mechanical properties of C/C composites was analyzed. The mechanical tests for ordinary C/C samples and C/C samples with anti-oxidation coating were carried out under various high temperature and oxidation conditions. The properties of C/C composites with anti-oxidation coating were focused on. It was pointed out that the material properties were mainly affected by the coupling factors of high temperature, pre-stress, oxidation environment and duration. The influence laws of these factors for the high temperature strength of C/C composites with anti-oxidation coating were further discussed and summarized.
Shaking table test on the dynamic responses of shield tunnel in liquefiable stratum
Authors: Feng Yi
Published: May 2023

Seismic liquefaction affects badly the safety of the underground structures. For the dynamic responses of the tunnel in liquefied watered sandy stratum in one of the rail transit projects in Shanghai, this paper proposes a tunnel-foundation shaking table model test and analyses the dynamic responses of electrolytic desaturation technology on surrounding soil, which provides some theoretical guidance for seismic designs of Shanghai rail transit projects. The test result shows that the excess pore pressure ratio of soil decreases gradually with the increase of buried depth; sand is easier to liquefy than silt so the tunnel liquefaction and uplift during the sandy section should be paid more attention to; electrolytic desaturation technology works significantly on improving the liquefaction resistance abilities of sand and silt which can effectively reduce the damage caused by tunnel uplift due to seismic liquefaction.
Dynamic analysis on the structure of metro station under high-speed railway load
Authors: Wang Weiying , Huang Quanqiang , Pan Ke , Li Jinmei
Published: May 2023

High-speed railways often run over underground metro stations. Dynamic load induced by high-speed train can influence the internal force of underground structure and hence can pose danger to the underground structure. Hence, it is necessary to estimate the safety of underground structure due to high-speed train load. In this paper, the effects of dynamic load induced by high-speed train on metro station are investigated by carrying out three-dimensional numerical analysis. Guinan high-speed railway, which is designed to run over Jinqiao metro station in Nanning, Guangxi province of China are adopted as the background of this case study. The hardening soil model with small-strain stiffness was adopted to model the behaviour of soil. Two typical speed of railway train (i.e., 160 km/h and 350 km/h) are considered in this study. Based on the numerical analysis, vertical vibration acceleration and bending moment of the structure of the metro station are presented and analysed.
Seismic responses of functionally graded concrete piers with double plastic hinges
Authors: Deng Jiangdong , Zhang Fang
Published: May 2023

The seismic responses of functionally graded concrete piers with double plastic hinges were studied by finite element (FE) analysis, and especially the formation and effects of double plastic hinges were analyzed in details. The results showed that double plastic hinges in functionally graded concrete piers were made by the graded reinforcement with glass fiber reinforced plastic (GFRP) bars and steel bars. Because GFRP bars have large elastic deformability, double plastic hinges can be stably formed at the bottoms of two grades in turn under different seismic waves. Compared with the traditional reinforced concrete piers, the load bearing capacity, deformation capacity, energy consumption and resisted seismic acceleration of functionally graded concrete piers with double plastic hinges are significantly improved.
Analysis of ground motion measurement data under engineering blasting condition
Authors: Song Shiqian , Shi Yongxiang , Li Zengyue , Huang Xiaofei , Xing Yuanding
Published: May 2023

To ensure that large precision instruments and equipment are in the best working condition, it is necessary to provide a suitable working environment for them. At this time, there is a high requirement for the vibration of the foundation at the location. Measuring the foundation vibration parameters, analyzing the foundation vibration state, and taking necessary damping measures during the construction process to provide basis are the premise of equipment installation and normal work. Combined with an application example, this paper briefly introduces the general situation of a project blasting, and obtains the basic characteristic parameters such as the peak velocity of ground motion and the time of arrival during the blasting operation; Based on the basic principle of regression analysis, the relationship between the peak velocity and the distance between the detonation centers and the charge weight is obtained by fitting the Sadovsky formula.
Effective acceleration design for solving excessive vibration in the cockpit
Authors: Shu Juncheng , He Erming , Li Yongzhi
Published: May 2023

To address the issue of vibration discomfort caused by excessive vibration in the cockpit, a method that allocates vibration reduction index (VRI) to different vibration transfer paths is proposed. By combining the identified vibration contribution of vibration sources using the transfer path analysis (TPA) method with the evaluated relative difficulty levels of vibration reduction design in these paths through the fuzzy analytical hierarchy process, the allocation weights can be constructed, which enables the VRI at the target location can be allocated to these paths, and effective amplitude values of acceleration transferred by these paths can be designed. Then, the specific process of the method is illustrated by a study case on the acceleration designed at the cockpit floor-seat connection. The results show that to achieve a vibration discomfort level that cannot be felt at this location, the effective acceleration amplitudes transferred from the main landing gear compartments and the engines need to be reduced by at least 61.55 % and 77.23 %, respectively. This method can effectively allocate acceleration transferred and guide the cockpit vibration comfort design.
Gestão da escola pública: a distância entre o discurso e a ação
Authors: Kussem Juliana , De Souza Ângelo Ricardo
Published: May 2023

Este texto tem como objetivo ampliar o arcabouço metodológico dos estudos que analisam o cotidiano da gestão das escolas públicas. O recorte proposto utiliza dados de uma pesquisa realizada e investiga o descompasso entre o discurso e a ação acerca da gestão democrática de diretores de três escolas de Ensino Fundamental da rede municipal de ensino de Curitiba. A partir de um questionário, do shadowing, de entrevistas e de observação, construiu-se uma tipologia com quatro categorias: Gestão Democrática; Gestão democrática’; Gestão Tradicional’; Gestão Tradicional. Essas categorias permitiram o cotejamento com a realidade empírica, com a teoria (LIMA, 1998; PARO, 2012, 2016; SOUZA, 2009; WEBER, 2000) e entre os casos de gestão dos três diretores de escolas. Os resultados obtidos indicam que os três casos observados apresentaram um discurso democrático semelhante, denunciando a influência da formação inicial e continuada desses profissionais. Dentre outros aspectos, a ação apresentou-se diferenciada em cada um dos casos. O artigo conclui que as contribuições de cada uma das técnicas de pesquisa foram fundamentais na produção dos resultados.
hermenêutica fenomenológica como método e a educomunicação como sujeito
Authors: Dedoné Tiago Silvio , Munhoz Costa Patricia Helena de Ribeiro , Mesquida Peri
Published: May 2023

O artigo objetiva demonstrar um diálogo entre a fenomenologia e a hermenêutica como métodos teóricos de pesquisa que buscam desvelar a essência do fenômeno no campo da Educomunicação, pois colocam o fenômeno como sujeito-objeto de pesquisa dentro do seu contexto e possibilitam a interpretação com criticidade. A pergunta norteadora desta pesquisa é: como relacionar esses dois métodos complexos com o campo da Educomunicação? O aporte teórico está centrado em Husserl (2000; 2006); Foucault (2006); Ricoeur (1989); Heidegger (1967; 1999); Freire (1980; 2011), Freinet (1974) e Soares (2000). O método filosófico é a Hermenêutica Crítica, com a abordagem qualitativa. Os resultados apontaram que os métodos envolvem os sujeitos e suas consciências do mundo/fenômeno. Na aproximação do campo da Educomunicação com a Hermenêutica Fenomenológica Dialógica ocorre a identificação de um fenômeno aparente que passa por uma interpretação dos discursos e dos sentidos na relação entre os campos de comunicação e de educação.
Prevalence of Peri-implant Diseases in Patients Attending a Colombian University Dental Clinic: A
Retrospective Study
Authors: Pérez F. , Urueña S. , Calderón L. , Martínez S. , Garzon H.S.
Published: May 2023

Introduction:

Due to the growing demand for dental implants to treat edentulism, the presence of peri-implant diseases
(PD) is also increasing. Estimates of the prevalence of PD in the world continue to be heterogeneous.
According to the new classification of periodontal and peri-implant diseases in the Colombian population,
its frequency was unknown.

Objective:

To evaluate the prevalence of PD in patient assistants in a dental clinic of a Colombian university in
Bogotá between 2015-2020.

Methodology:

Cross-sectional observational study based on dental records. From a sample frame of 370 dental records of
patients treated with dental implants, a sample size of 156 was established and chosen randomly. An analysis
was performed through descriptive and inferential statistics. Statistical significance was considered
p < 0.05. The open statistical package R was used.

Results:

The final sample was 216 implants. The prevalence of peri-implant health was 50.93%, peri-implant mucositis
31.48%, and peri-implantitis 17.59%. There was a significant relationship between elevated Silness and Löe
index and female gender with the development of PD (
p=0.000). Systemic conditions other
than diabetes, implant placement time, simultaneous regeneration, surgical and post-surgical complications,
placement site, and adherence to maintenance therapies did not have statistical significance.

Conclusion:

The prevalence of PD was 49.07% in these implants. This indicates the need for a follow-up program and
supportive peri-implant therapy.
Association between Self-perceptions of Periodontal Health and Electronic Cigarette use in Young Adults
Authors: Miguras Maite , Leon-Rios Ximena Alejandra
Published: May 2023

Background:

The present study aimed to determine the association between self-perceptions of periodontal health and electronic cigarette use.

Material and Methods:

The study used an observational, analytical and cross-sectional design. 189 young adults aged 18 to 29 from the Metropolitan area of Lima, Peru, were recruited. In order to evaluate self-reported periodontal health, a questionnaire conceived by Quiroz et al. (2017) was used. This includes 13 questions divided into two dimensions (habits and self-perceived periodontal health). Poisson regression with robust variance was used to examine associations between qualitative variables and calculate raw and adjusted prevalence ratios.

Results:

59.46% of participants using electronic cigarettes were found to have a poor perception of gum health. Statistically significant associations were produced between poor perceptions of gum health and vaping, regarding both raw data (PR=0.81; 95% CI: 0.69-0.95; p=0.011) and data adjusted to consider covariates (PR=0.82; 95% CI: 0.69-0.97; p=0.021). No associations were observed for the dimensions of bleeding during brushing, reddish, and/or swollen gums.

Conclusion:

A relationship was found between poor perceptions of gum health and electronic cigarette use.
Thermocycling Stain Challenge and Colour Stability of two Current Zirconium Silicate-filled Indirect Composite Restorative Materials
Authors: Kassim Zethy Hanum Mohamed , Faiz Anuar Muhamad Alif , Ramli Sujana , Ismail Ikmal Hisham , Angelis Nicola De
Published: May 2023

Aim:

This study compares the colour stability of two zirconium silicate-filled indirect composite materials CM and its improved formulation CMD using an in vitro thermocycling stain challenge model with 2 immersion solutions. The rationale of the thermocycling stain challenge model is to replicate the intraoral conditions that the indirect composite materials may be exposed to during a clinical service, water or saliva absorption and cyclical exposure to staining food colourant at varying temperature extremes.

Materials and Methods:

Ten discs each from shade A1 subtypes of CM and CMD indirect composites (Dentine Body A1B, Incisal 58, and Translucent HVT) were subjected to a thermocycling stain challenge following final polishing, which consisted of static immersion in 37°C of distilled water, followed by 500 thermocycles in 5°C of tea and 55°C of soy sauce and finally a 10-minute cleaning using an ultrasonic device. L*, a* and b* colour coordinates were measured, and the mean colour difference expressed as Delta E (ΔE) at different time points of the experiment were calculated and compared.

Results:

CM and CMD indirect composites had a significant color difference at all experimental time points (F=37.818, p<0.001). ΔE for CM subtypes and CMD subtypes in descending order, respectively, were Translucent HVT>Incisal 58>Dentin Body A1B and Incisal 58>Translucent HVT>Dentin Body A1B.

Conclusion:

CMD indirect composite showed improved colour stability compared to CM indirect composite.

Clinical Significance:

Limiting the usage of translucent shades and polishing according to the manufacturer’s recommendation may improve the overall colour of prostheses made using indirect zirconium silicate-filled composite materials.
Acoustic, FTIR and Raman spectroscopic studies of aspartame and citric acid
Authors: K M Benazir Banu , N S Shubhashree , George Preetha Mary
Published: May 2023

aims:

To study the molecular interactions between artificial sweetener and edible acid

background:

Ultrasonics, Material Science

objective:

To determine the molecular interactions between artificial sweetener and edible acids using acoustical parameters

method:

Acoustical parameters, spectroscopy and stability constant

result:

The molecular interactions and functional groups that are present is found

conclusion:

As the concentration increases, acoustical parameters like ultrasonic velocity, viscosity, density, Relaxation time, acoustic impedance while, other acoustical parameters like adiabatic compressibility and intermolecular free length decreases with the increases with concentration. This proves that there is a strong interaction between solute and solvent.

other:

Spectroscopy Experimental Study
Intrinsic Point Defects in ZnO
Authors: Dhiman V.
Published: May 2023

ZnO has attracted extraordinary interest as a premier host for dilute magnetic semiconductors due to its potential usage in optoelectronics, spin light emitting diodes, photovoltaics, photodetectors, and solar cells. It is a prospective material for spin light emitting diodes due to its broad band gap of 3.37 eV and high exciton binding energy. The extraordinary properties of ZnO results from the interactions of intrinsic defects in ZnO. The redistribution of these defects within the grain using sintering, annealing or extrinsic doping helps in tailoring the optical, electrical and magnetic properties of ZnO. Therefore, in this chapter, we will discuss about various intrinsic point defects present in ZnO, defect creation techniques, defect characterization, the factor affecting defect formation. The Zinc interstitial, Oxygen vacancies and their complexes are responsible for various band emissions and hence luminescent properties of various defects in ZnO are discussed.
ZnO Hybrid Nanostructures for Solar Cell Applications
Authors: Kumar N.
Published: May 2023

ZnO, Perovskite Solar Cell, Dye-Sensitized Solar Cell, Hetro-Junction Solar Cell
Evaluation of water balance in the Jaro Irrigation area, Tabalong Regency, South Kalimantan Province
Authors: Landrawijaya Raka Bagoes , Amalia Maya
Published: May 2023

In the Tabalong Regency, South Kalimantan Province, many irrigation networks have not worked optimally. The Jaro Irrigation Area is one of these irrigation networks, the majority of available fields are planted with Paddy. Evaluation of irrigation water to irrigate paddy fields is very important for optimal growth and development of paddy. The objective of this research is to evaluate the water balance, the potential area for paddy field area development can be obtained by applying the optimal crop pattern. Analysis of the rainfall data used in this study with statistical analysis in the form of validation and correction of rainfall data. Rainfall data was obtained from the Tropical Rainfall Measurement Mission (TRMM) and the Meteorology, Climatology, and Geophysics Agency (BMKG) Jaro Station in the period 2013-2019, the data using statistical analysis obtained a correlation coefficient and regression equation. The regression equation is used to obtain the corrected rainfall value which will be used in the hydrological analysis. Water requirement analysis with several cropping pattern scenarios. Calculation of evapotranspiration using the Modified Penman method. The F.J Mock method is used to develop the discharge value. Dependable discharge, 80%, is used to estimate water availability. Furthermore, an evaluation of the water balance is carried out for each scenario, and the result of information on surplus or deficit conditions can be obtained each month. Analysis of water demand discharge based on planting scenarios is divided into three. First Scenario with a high-yield paddy - a high-yield paddy according to the existing conditions at the research location. The second scenario is with a high-yield paddy - high-yield paddy - beans and the third scenario is with a high-yield paddy - paddy. According to the results of the water balance evaluation for the three scenarios, the potential area can be reached up to 900 ha from 850 ha with the chosen crop pattern in scenario number 2.