Results Of Test Research Articles

Experimental Study on the Mechanical Properties of Disposable Mask Waste-Reinforced Gangue Concrete.

This paper is grounded on the following information: (1) Disposable masks primarily consist of polypropylene fiber, which exhibits excellent flexibility. (2) China has extensive coal gangue deposits that pose a significant environmental hazard. (3) Coal gangue concrete exhibits greater fragility compared to regular concrete and demonstrates reduced resistance to deformation. With the consideration of environmental conservation and resource reutilization, a preliminary concept suggests the conversion of discarded masks into fibers, which can be blended with coal gangue concrete to enhance its mechanical characteristics. In this paper, the stress-strain law of different mask fiber-doped coal gangue concrete (DMGC) under uniaxial compression is studied when the matrix strength is C20 and C30, and the effect of mask fiber content on the mechanical behavior and energy conversion relationship of coal gangue concrete is analyzed. The experimental results show that when the content of mask fiber is less than 1.5%, the strength, elastic modulus, deformation resistance, and energy dissipation of the concrete increase with mask fiber content. When the amount of mask fiber is more than 1.5%, because the tensile capacity and energy dissipation level of concrete produced by the mask fiber cannot compensate for the compression and deformation resistance of concrete of the same quantity and because excess fiber is difficult to evenly mix in the concrete, there are pore defects in concrete, which decreases the concrete strength due to the increase in mask fiber. Therefore, adding less than 1.5% mask fiber helps to improve the ductility, toughness, impermeability, and oxidation and control the cracking of coal gangue concrete. Based on Weibull theory, a constitutive model of DMGC is established, which fits well with the results of a uniaxial test, providing support for understanding the mechanical law of mask fiber-doped concrete.

Kemampuan Pemecahan Masalah pada Materi Pecahan Siswa Kelas IV SD YPK ELIM MALANU Kota Sorong

This research is inspired by the lack of students' ability to solve math problems, especially in fraction material. This can be seen from the results of the daily test of fraction material which is still under the Minimum Completeness Criteria (KKM). The purpose of this study was to determine whether there is an effect of the inquiry learning model on students' mathematical problem solving ability on fraction material in Class IV of YPK Elim Malanu Elementary School in Sorong City. This research is quantitative research using experimental methods. The data collecting techniques that were used were observation, test, and documentation techniques. The instrument used in this research is a test, which is divided into pre-test and post-test. The analysis technique used is descriptive statistical analysis and inferential statistical analysis. The results of descriptive analysis showed that the average learning outcomes of mathematics that were taught using the inquiry learning model from 47.78 became 73.77. Furthermore, the results of inferential analysis using SPSS show that there is a significant difference between the learning outcomes of mathematics that were taught using the inquiry model. The calculation result of sig value = 0.98 is less than a = 0.05 (0.98 < 0.05) which means Ho is rejected and Ha is accepted.

Assessment of rehabilitation effectiveness in patients with COPD as part of the project "PulmoRehab – Access to healthcare services through a personalized care system for patients with COPD, including remote monitoring and tele-rehabilitation based on Artificial Intelligence methods"

Introduction. In the project “PulmoRehab – Access to Healthcare Services through a Personalized Patient Care System for COPD including Remote Monitoring and Tele-rehabilitation Based on Artificial Intelligence Methods,” SP ZOZ Specialized Hospital Ministry of Internal Affairs and Administration in Głuchołazy and 10 partners conducted research on tele-rehabilitation for people suffering from Chronic Obstructive Pulmonary Disease (COPD). The tele-rehabilitation program, based on personalized approach and technology, allowed patients to use therapy at home or a convenient location. The project aimed to reduce social inequalities in healthcare by providing remote access to health services for COPD patients. Materials and Methods. The study involved 80 patients aged 50 to 76 years, hospitalized at Ministry of Internal Affairs and Administration’s Specialist Hospital of St. John Paul II, meeting specific criteria. Qualification for the tele-rehabilitation program took into account the assessment of exercise tolerance, dyspnea, fatigue, lung ventilatory function, and saturation. The program included exercises adapted to the individual needs of the patients. Results. Analysis of the results conducted using XLSTAT software 2021.2.2 showed statistically significant differences between spirometric values before and after rehabilitation. Similarly, significant improvement was observed in the results of the 6MWT test and blood saturation. The tele-rehabilitation program proved effective in improving respiratory health parameters in COPD patients. Conclusions. 1. The tele-rehabilitation program improves lung ventilatory function in people with COPD. It reduces the feeling of dyspnea, decreases fatigue, improves SpO2, and increases exercise tolerance, demonstrating the beneficial effects of the rehabilitation applied. 2. The obtained results encourage further research on a representative group with the use of randomization.

Experimental study on fatigue failure properties of mudstone interlayers under discontinuous loading in salt cavern gas storage

During the operation of an underground salt cavern gas storage, Fatigue failure occurs in the surrounding rock of gas storage reservoirs under non-continuous gas injection and extraction loading. Due to the special layered salt rock structure in China, the mudstone interlayer is the weak part of the gas storage. It is necessary to study the effect of stress magnitude and interval time on the fatigue mechanical properties of mudstone. Graded upper stress limit interval fatigue (GUIF) test and graded lower stress limit interval fatigue (GLIF) test were carried out on mudstone respectively. And different interval times were set to investigate the effect of interval time on the mechanical properties of mudstone. With the increase in the interval time, the fatigue life and peak strain of the mudstone increased. Under the same interval time, the lower-limit interval test result showed a significantly higher fatigue life than the upper-limit interval test result. The stress–strain curve exhibited three stages: scattered–dense–scattered. During the unloading phase, the modulus of elasticity increased with increasing stress levels, indicating that the internal structure of the mudstone is extremely sensitive to the stress. In the (GUIF) test, the average residual strain increased with the increase in the interval time, and the residual strain during the cycle after the time interval under different grades was lower than the residual strain before the time interval; the results of the (GLIF) test showed the opposite trend. In the (GUIF) test, the average creep strain increased with increasing interval time under the same stress level, and the average creep strain was greater than the average residual strain, and the creep stage had a greater effect on mudstone damage than the fatigue stage. The post-fatigue creep strain was significantly greater than the pre-fatigue creep strain. The research results can be useful in ensuring the stable operation of gas storage in salt caverns.

The Effect of Small Sided Games and Dynamic Passing Training on Improving Cognitive Intelligence and Vo2max Ability of Football Players

The game of soccer is a team game played by two teams where each team has 11 players, with the aim of scoring as many goals as possible. This study used small sided games and dynamic passing training methods, aiming to determine the effect of small sided games and Dynamic Passing training on improving cognitive intelligence and VO2Max ability of soccer players. This research is a quasi-experimental research, with a research design of two groups pretest and posttest design. The sample in this study amounted to 19 children. The data analysis technique uses a t-test with a significance value of 0.05 assisted by the SPSS application version 25. Based on the results of digit span test data analysis, the treatment group received a sig value. 0.361 and a control group of SIG. 0.375, due to differences in respondent characteristics, background cognitive abilities and the small number of respondents. Meanwhile, from the results of VO2Max data analysis, the treatment group obtained sig values. 0.005 and a control group of SIG. 0.045, because in the preparation of its exercise program it has applied important factors in increasing endurance. Then the results of the independent sample t-test t-test digit span test get a sig. 0.157 and VO2Max test results get sig. 0.333. The conclusion in this study is (1). There was no significant effect of small sided games and dynamic passing on cognitive intelligence. (2). There is a significant effect of small sided games and dynamic passing exercises on Vo2Max Ability. (3). There was no significant difference in the effect of small sided games and dynamic passing on cognitive intelligence and Vo2Max ability.

The Influence of Organizational Culture on Organizational Citizenship Behavior Through Organizational Commitment (Study of Employees at the Mona Plaza Hotel Pekanbaru)

This research was conducted because the author found problems regarding weak organizational citizenship behavior of employees seen from the development of the number of employees who experienced fluctuations and the development of employee absenteeism levels which showed that every year all employees were still found to be absent from work.
 The purpose of this study was to ascertain and examine how organisational culture affects organisational citizenship behaviour in Mona Plaza Pekanbaru hotel workers through organisational commitment. There were two categories of data that were gathered for this study: primary and secondary data. Respondents filled out surveys in order to provide primary data.
 The results of the Indirect Effect test indicate that the results are significant for the organisational culture variable on organisational citizenship behaviour through organisational commitment at the Hotel Mona Plaza, Pekanbaru. The results of the Direct Effect test showed that the results were not significant on the organisational culture variable on organisational citizenship behaviour at the Mona Plaza Hotel Pekanbaru. The results of the Significant Results test showed that the results were significant on the Organisational Culture variable on Organisational Commitment at the Mona Plaza Hotel Pekanbaru.

Kontribusi Cyber Wellness terhadap Online Disinhibition pada Mahasiswa yang Aktif Menggunakan Media Sosial

This study used quantitative methods with a correlational approach. The population in this study was students who actively used social media totaling 212 samples. Sampling using purposive sampling technique. This study used a Cyber Wellness scale of 14 items with a coefficient of 0.816 and an Online Disinhibition scale of 25 items with a coefficient of 0.874. Data analysis, using simple regression techniques yielded a correlation coefficient of 0.542 with a p value (significant) of 0.000< 0.05, so it can be concluded that H1 is accepted and H0 is rejected. The results of the hypothesis test contained an R Square value of 0.293, thus the contribution of Cyber Wellness to resilience was 8%. The results showed that there was a contribution of Cyber Wellness to Online Disinhibition in college students who actively used social media with a negative relationship direction.

Study on corrosion performance and corrosion product composition of weathering steel and high‐performance steel in simulated C3 environment

AbstractWeathering steel (WS) and high‐performance steel (HPS) have been widely used in bridge engineering. Investigating the corrosion performances of WS and HPS is of great significance to the safety evaluation and maintenance of uncoated WS or HPS bridges, especially aging bridges. This study focused on the correlation between the corrosion performance and composition of the rust layer. Accelerated corrosion tests were conducted on Q345CNH and HPS 70 W to observe their corrosion performance under salt‐spray corrosive environment. Based on the results of corrosion test and the existing corrosion attack evaluation theories, the empirical formulae of uniform corrosion and pitting corrosion were derived. X‐ray diffraction experiments were performed to analyze the composition of the rust layer formed on the surface of steel specimens after various corrosion cycles. The relationship between the composition of the rust layer and the corrosion performance was established. The test corrosive environment was verified to be consistent with the C3 environment. The conclusions of this study could provide guidance for the corrosion evaluation in the following test or practical application.

Uncertainty and Credit: The Chicken or the Egg Causality Dilemma

ABSTRACT This paper seeks to explore whether bank credit (BC) contains useful information for mitigating economic policy uncertainty (EPU). The results of the bootstrap rolling-window test show that EPU is an effective channel for triggering BC. Additionally, it finds a feedback effect of BC on EPU, indicating that BC is a favorable tool for predicting EPU. Rising policy uncertainty leads banks to adopt aggressive or conservative credit strategies, which further increases policy adjustments. This circular relationship seems to be caught in a chicken or egg dilemma, demonstrating the importance of the government and the banking system in maintaining economic stability.

Longer peripheral-track lesions are associated with instability after arthroscopic Bankart repair

BackgroundThe Glenoid track concept has enabled the categorization of Hill-Sachs lesions (HSLs) into on-track lesions and off-track lesions. Furthermore, among the on-track lesions, further categorization has been established based on the distance from the medial edge of the Hill-Sachs lesion to the medial edge of the glenoid track, into peripheral-track lesions and central-track lesions. Recent studies on peripheral-track lesions and central-track lesions within the glenoid track have shown inconsistencies in failure rates, which deserves further investigation. MethodsA retrospective cohort comparison of patients who underwent arthroscopic Bankart repair between 2015 and 2020 was performed. 102 patients with peripheral-track HSLs were included. The patients were divided into two groups based on the results of the postoperative apprehension test: the apprehension positive group (n=30), and the apprehension negative group (n=72). Using preoperative computed tomography and an image reconstruction program, three-dimensional images were segmented to calculate the length, width, depth, and distance of the HSLs. A multivariate logistic regression was used to determine the risk factors of recurrence, for which odds ratio (OR) and 95% confidence interval (CI) were provided. ResultsA multivariate logistic regression analysis revealed that the length of the peripheral-track HSLs was a significant independent predictor of failure in this study. (OR 1.380; 95% CI 1.170–1.627; P<0.001). The receiver operating characteristics curve demonstrated a predictive power (area under the curve = 0.841) and a threshold value of 14.2 mm. ConclusionLength was the only risk factor for the recurrent instability of peripheral-track HSLs after ABR. In the context of surgical decision-making, utilizing the glenoid track concept, medical practitioners may need to evaluate instability by considering the length as a continuous factor, while differentiating between peripheral-track and central-track classifications.

Face anthropometry for filtering facepiece respirators: analysis of the association between facial dimensions and respirator fit.

Ensuring proper respirator fit for individuals remains a persistent challenge in occupational environments, yet there is limited knowledge about how respirators interact with the face to "'fit." Previous studies have attempted to understand the association between face dimensions and respirator fit using traditional head/face anthropometry not specifically tailored for respirators. The purpose of this study was to assess and compare the ability of filtering facepiece respirator (FFR)-specific face anthropometry with traditional head/face anthropometry in exploring the relationship between facial dimensions and the fit of FFR. The study utilized 3D face scans and quantitative fit factor scores from 56 participants to investigate the relationship between face anthropometry and FFR fit. Both FFR-specific and traditional anthropometric measurements were obtained through 3D anthropometric software. Intra-correlation of anthropometry was analyzed to evaluate the efficiency and effectiveness of FFR-specific and traditional anthropometry respectively. Principal component analysis (PCA) was conducted to test the usefulness of the PCA method for investigating various facial features. Logistic regression was used to develop fit association models by estimating the relationship between each face measurement set and the binary outcome of the fit test result. The prediction accuracy of the developed regression models was tested. FFR-specific face anthropometry consists of a set of measurements that can inform the detailed facial shape associated with the FFRs more effectively than traditional head/face anthropometry. While PCA may have been effective in reducing the variable dimensions for the relatively large parts of the human body such as upper and lower bodies in previous literature, PCA results of FFR-specific and traditional anthropometry were inconsistent and insufficient to describe face dimensions with complex anatomy in a small-detailed area, suggesting that facial shape should be understood through a variety of approaches including statistical methods. Logistic regression analysis results confirmed that the association models of FFR-specific face anthropometry were significant with higher prediction accuracy and had a better model's goodness of fit than those of traditional head/face anthropometry in 3 conditions inputting all measurements, all PC scores, or top 5 measurements from PCA. The findings showed that the FFR fit association model enables an understanding of the detailed association between face and respirator fit and allows for the development of a system to predict respirator fit success or failure based on facial dimensions. Future research would include testing the validity of the model and FFR-specific measurement set on different respirator types, expanding the population set, and developing an integrated approach using automated and machine learning technologies to inform FFR selection for occupation workers and the general population.

Efficacy of acellular fish skin graft in the management of chronic ulcer: a systematic review and meta-analysis.

The wounds failing to heal through a timely and orderly standard of care (SOC) treatment are considered as chronic wounds, which add significant burden to healthcare systems around the world. SOC treatment has been commonly applied for management of chronic wounds, but SOC alone may not be adequate to heal all ulcers effectively. Fish skin graft (FSG) is a xenogenic skin substitute which could be used for accelerating skin healing. The current study was performed with the view of evaluating the effectiveness of FSG as an adjuvant treatment of SOC for chronic ulcer treatment. Two authors independently searched the following electronic databases: PubMed, Embase, and CENTRAL, using keywords including "diabetic foot ulcer," "fish skin graft," and "wound healing." Clinical studies that evaluated the clinical outcomes of FSG in treatment of chronic ulcers were included in this meta-analysis. Random- or fixed-effect modeled meta-analyses were performed according to the heterogeneity test result (i.e., I2), to analyze the clinical outcome of FSG. A total of 8 studies were included in qualitative synthesis and meta-analysis, with 145 patients treated by SOC and 245 patients treated by SOC plus FSG. There was no significant difference between two groups for time to healing (MD = 1.99, 95% CI: -3.70~7.67, p = 0.493). The complete healing rate was significantly higher in FSG group compared with SOC alone (OR = 3.44, 95% CI: 2.03~5.82, p < 0.001***). Mean percentage area reduction (PAR) was reported in six studies, with a range of 71.6~97.3%. However, many of these studies did not report the value of standard deviation (SD), so we could not pool the data. No significantly different ulcer recurrence rate (RR = 0.60, 95% CI: 0.07~5.27, p = 0.645) and severe adverse events (SAEs) risk (RR = 1.67, 95% CI: 0.42~6.61, p = 0.467) were found between two groups. The application of FSG treatment for patients with chronic ulcers that do not respond well to SOC management could significantly increase the complete healing rate compared with SOC alone, without increased recurrence rate and SAEs risk.

Kaolin loaded gelatin sponges for rapid and effective hemostasis and accelerated wound healing

Severe trauma with massive active blood loss, including liver and spleen rupture, arterial bleeding and pelvic fracture, will lead disability, malformation and even death. Therefore, it is very important to develop new, fast and efficient hemostatic materials. In this study, a novel Gelatin/Kaolin (GE/KA) composite sponge was developed. Meanwhile, to further investigate the effect of kaolin content on sponge properties, we prepared four types of sponges: GE/5% KA, GE/10% KA, GE/15% KA and GE/20% KA. The results of coagulation test in vitro showed that compared to the other groups, there were more activated adhered platelets and red blood cells on the surface of GE/15% KA. The results of hemostasis test in vivo showed that compared to other experimental groups, the GE/15% KA group had significantly less hemostasis time (liver hemostasis model: 69.50 ± 2.81 s; femoral artery hemostasis model: 75.17 ± 3.06 s) and bleeding volume (liver hemostasis model: 219.02 ± 10.39 mg; femoral artery hemostasis model: 948.00 ± 50.69 mg), and was similar to the commercial hemostasis material group. Additionally, the material properties of the sponge were characterized and its biocompatibility was verified as well through cell experiments and in vivo embedding experiments. All these results indicate that the optimal content of kaolin is 15%, which provides a theoretical basis for subsequent research. All in all, the novel GE/KA composite sponge prepared in this study can be used as a multifunctional hemostatic wound dressing for the treatment of complex wounds under various trauma scenes.

Evaluation of lower limb function and gait characteristics after fibulectomy in adults

To explore the effects of fibulectomy on lower limb function and gait of adult patients through gait analysis, in order to provide guidance for clinical treatment. A clinical data of 24 patients who underwent fibulectomy and met the selection criteria between January 2017 and December 2022 was retrospectively analyzed. There were 12 males and 12 females with an average age of 25 years (range, 18-68 years). The length of fibulectomy was 10-19 cm, with an average of 15 cm. The patients underwent routine rehabilitation training after operation. The occurrence of postoperative complications was recorded, the pain degree of surgical incision was evaluated by visual analogue scale (VAS) score, and the residual fibular bone was reviewed by imaging. A gait test system was used before operation and at 6 months after operation to collect gait data of healthy and affected sides under slow, medium, and fast velocity conditions, including gait parameters (foot rotation angle, step length, support phase, swing phase, gait line length, single support line, maximum force 1, maximum force 2) and the tripod area parameters (maximum pressure, time maximum force, and contact time of forefoot, midfoot, and hindfoot). All incisions healed by first intention after operation. All patients were followed up 1-5 years, with an average of 3 years. The great dorso-extension muscle strength decreased in 3 cases, and the sensory defects in the operative area and distal part occurred in 5 cases. The VAS scores of incisions were 0-6 (mean, 4) at 6 months after operation and 0-5 (mean, 2) at last follow-up. During follow-up, imaging review showed that 5 cases had osteoporotic changes of distal residual bone of the fibula, and the residual segment was shorter and more significant; 3 cases had new bone formation. The results of gait test showed that the gait parameters and the tripod area parameters under the three gait speeds were consistent. There was no significant difference in the gait parameters and the tripod area parameters between the healthy side and the affected side before operation ( P>0.05). Compared with the healthy side, the foot rotation angle, the single support line, the maximum force 1, the maximum force 2, and the maximum pressures of the forefoot and midfoot of the affected side significantly decreased after operation ( P<0.05), and the step length, the time maximum force of midfoot and hindfoot, and the contact time of the forefoot and midfoot significantly increased ( P<0.05). Compared with preoperative conditions on the same side, the foot rotation angle, the gait line length of both sides significantly decreased ( P<0.05), and the maximum pressures of the forefoot, midfoot, and hindfoot and the time maximum force of the midfoot significantly increased ( P<0.05); the step length on healthy side significantly decreased, while the affected side significantly increased ( P<0.05); the maximum force 1 and the maximum force 2 on the healthy side significantly increased, while the affected side significantly decreased ( P<0.05); the single support line on the affected side significantly decreased ( P<0.05). Different degrees of clinical symptoms occurred, gait pattern changes, compensatory gait appears, gait stability decreases, and the risk of tumble increases in adult patients after partial fibulectomy. Therefore, it is recommended to walk slowly after fibulectomy.

Value of the human chorionic gonadotropin stimulation test in the diagnosis of disorder of sexual development in children

To investigate the value of the human chorionic gonadotropin (hCG) stimulation test in the diagnosis of disorder of sexual development (DSD) in children. A retrospective analysis was conducted on 132 children with DSD. According to the karyotype, they were divided into three groups: 46,XX group (n=10), 46,XY group (n=87), and sex chromosome abnormality group (n=35). The above groups were compared in terms of sex hormone levels before and after hCG stimulation test, and the morphological manifestation of the impact of testicular tissue on the results of the hCG stimulation test was analyzed. There was no significant difference in the multiple increase of testosterone after stimulation among the three groups (P>0.05). In the 46,XY group, the children with 5α-reductase type 2 deficiency had a testosterone-to-dihydrotestosterone ratio higher than that of the 46,XY DSD children with other causes. Morphological analysis showed that DSD children with testicular tissue demonstrated a significantly higher multiple increase in testosterone after stimulation compared to children without testicular tissue (P<0.05). The hCG stimulation test has an important value in assessing the presence and function of testicular interstitial cells in children with different types of DSD, and it is recommended to perform the hCG stimulation test for DSD children with unclear gonadal type.

A finite element model for investigating the influence of keel design and position on unicompartmental knee replacement cementless tibial component fixation

ObjectivesThe cementless Oxford Unicompartmental Knee Replacement (OUKR) tibial component relies on an interference fit to achieve initial fixation. The behaviour at the implant-bone interface is not fully understood and hence modelling of implants using Finite Element (FE) software is challenging. With a goal of exploring alternative implant designs with lower fracture risk and adequate fixation, this study aims to investigate whether optimisation of FE model parameters could accurately reproduce experimental results of a pull-out test which assesses fixation. Materials and methodsFinite element models of implants with three methods of fixation (standard keel, small keel, and peg) in a bone analogue foam block were created, in which implants were modelled using an analytical rigid definition and the foam block was modelled as a homogenous linear isotropic material. The total interference and elastic slip were varied in these models and optimised by comparing simulated and experimental results of pull-out tests for two (standard and peg) implant geometries. Then the optimised interference and elastic slip were validated by comparing simulated and experimental data of a third (small keel) implant geometry. ResultsThe optimisation of parameters established an interference of 0.16 mm and an elastic slip of 0.20 mm as most suitable for modelling the experimental force–displacement plots during pull-out. This combination of parameters accurately reproduced the experimental results of the small keel geometry. The maximum pull-out forces from the FE models were consistent with experimental data for each implant design. ConclusionsThis study shows that experimental pull-out tests can be accurately modelled using adjusted interference values and non-linear friction and outlines a method for determining these parameters. This study demonstrates that complex problems in modelling implant behaviour can be addressed with relatively simple models. This can potentially lead to the development of implants with reduced risk of failure.

Mother's Knowledge and Attitude Regarding Speech Delay Prevention in Children: A Cross-sectional Study in Pantai Labu Health Center of Deli Serdang Regency

Background: The term speech delay is a disorder of speech delay which is classified as an expressive language disorder or with difficulty expressing, which occurs in early childhood. The lack of communication time between young children and their parents or peers can affect their language skills. Objective: To find out whether there is a relationship between mother's knowledge and attitudes regarding preventing speech delay in children aged 1-3 years. Method: This research uses descriptive analytical research with a cross-sectional research design. The population used was all mothers who had children aged 1-3 years with a total sample of 111 people, and the sampling technique was the Non- Probability Sampling technique. Results: The results of the Chi-square test statistic showed a p-value = 0.00. With a 95% confidence level ∝ = 0.05. This means that there is a relationship between maternal knowledge and the prevention of speech delay in children aged 1-3 years in the Pantai Labu Health Center, Deli Serdang Regency. The statistical test results of the Chi-square test showed a p-value = 0.00. With a 95% confidence level ∝ = 0.05. This means that there is a relationship between the mother's attitude and the prevention of speech delay in children aged 1-3 years in the Pantai Labu Health Center. Conclusion: It is hoped to provide support and information to mothers to find out their child's language development and detect early if there are problems with their language development (speech delay).

The Effect of Calcination Temperature and Time on the Synthesis of Graphene nanoplatelets - TiO&lt;sub&gt;2&lt;/sub&gt; Composites on Photocatalytic Performance

TiO2 is the most widely used photocatalytic material to degrade waste compounds. To improve the photocatalytic performance of TiO2, graphene nanoplatelets were used as doping on TiO2. Graphene nanoplatelets are a hybrid between graphene and graphite. Graphene nanoplatelets have attractive features, including mechanical toughness, and for composite material applications. In this report, we investigate the effect of calcination on the synthesis of graphene nanoplatelets-TiO2 synthesis material for photocatalytic processes. Graphene nanoplatelets-TiO2 composites were prepared by stirring and evaporation methods. Then the composite was calcined at a temperature of 400°C, 500°C 600°C at intervals for 1, 2, 3 hours respectively. The composites were confirmed by X-ray diffraction (XRD), FTIR, SEM, BET, and UV-vis. The effect of calcination temperature on the surface, morphology, microstructure and photocatalytic activity of the graphene nanoplatelets-TiO2 composite was investigated further. The photocatalytic performance of the graphene nanoplatelets-TiO2 composite was evaluated for the photodegradation of phenol in an aqueous solution under a mercury lamp. Based on the results of the performance test in degrading phenol, the best results were obtained at a calcination temperature of 500°C for 3 hours. From the results of the characterization, it can be explained that 500°C calcination of this composite can improve the photocatalytic process in degrading of phenol.

ANTIOXIDANT ACTIVITY OF THE ACTIVE FRACTION OF MANGOSTEEN RIND EXTRACT (GARCINIA MANGOSTANA)

Objective: Determination of the IC50 value of the active Fraction was carried out to see the antioxidant activity of the ethanol extract of mangosteen peel (Garcinia mangosteen) Mangosteen peel is known to have very strong antioxidant activity. The research began with maceration of mangosteen peel with ethanol solvent. Then, the mangosteen peel extract was fractionated with three solvents, namely those with different polarities, namely water, dichloromethane, and n-hexane.&#x0D; Methods: The ethanol extract of mangosteen rind was further fractionated using n-hexane, dichloromethane, and water, then the solvent was removed by evaporation. The three resulting fractions were measured for antioxidant activity using the DPPH method with Quercetin as a comparison. The active Fraction with the highest IC50 value is then compared with the extract, and the comparison is seen with TLC. Next, the Fraction was tested with GC to see the remaining solvent. And then continued with determining alpha mangostin levels in all fractions using UHPLC.&#x0D; Results: IC50 value for each n-hexane fraction was 50.65µg/ml, the dichloromethane fraction was 34.66µg/ml, and the water fraction was 45.72µg/ml. The results of the solvent test showed that there was no residual solvent in the dichlormethane fraction, as seen from the chromatogram results. The results of the assay showed the following results: n-Hexan fraction 25.18%, DCM fraction 31.23%.&#x0D; Conclusion: The dichloromethane fraction showed the highest antioxidant activity with the best IC 50 value and had higher levels of alpha mangostin than the water and n-hexane fractions.

Unleashing the potential of CFRP laminate: enhancing mechanical characteristics with STF-Impregnated woven carbon fabric

The objective of this study is to evaluate the potential for enhancing the mechanical characteristics of carbon fiber reinforced polymer (CFRP) composites through the embedding of STF-impregnated woven carbon fabric within their structure, referred to as STFFC. The dynamic and static characteristics of the proposed STFFC were evaluated through a series of experimental tests including tensile, modal, dynamic mechanical analysis (DMA), low-velocity impact (LVI), and compression after impact (CAI) tests. The shear thickening fluid (STF), which was prepared by dispersing nano-silica particles in a solvent of polyethylene glycol (PEG), exhibited an abrupt increase in storage and loss modulus upon exceeding a critical shear strain. The result of the modal test revealed that the addition of STF-impregnated fabric into the CFRP composite led to greater damping ratios of 17.71–417.86%, despite the degradation of tensile strength by 10.81% and Young’s modulus by 12.49%. DMA results show that the STFFC has a larger tan δ except for between intersections of 118 °C, and 161 °C. For impact responses, the STFFC resulted in a lower contact force, with a reduction of 2.41–3.30%, and an increase in absorbed energy of 2.87–5.00%. Meanwhile, the CAI strength of the STFFC was degraded by 3.62 to 6.20%. Despite the reduction of tensile, impact, and CAI characteristics of the STFFC, it is noteworthy that the CFRP composites exhibited relatively minor degradation even with the application of STF. The results of the study suggest that embedding STF-impregnated woven carbon fabric can enhance the potential of CFRP composites, making them even more promising solutions for various applications.