Quality Standards Research Articles

Voxel-wise segmentation for porosity investigation of additive manufactured parts with 3D unsupervised and (deeply) supervised neural networks

AbstractAdditive Manufacturing (AM) has emerged as a manufacturing process that allows the direct production of samples from digital models. To ensure that quality standards are met in all samples of a batch, X-ray computed tomography (X-CT) is often used in combination with automated anomaly detection. For the latter, deep learning (DL) anomaly detection techniques are increasingly used, as they can be trained to be robust to the material being analysed and resilient to poor image quality. Unfortunately, most recent and popular DL models have been developed for 2D image processing, thereby disregarding valuable volumetric information. Additionally, there is a notable absence of comparisons between supervised and unsupervised models for voxel-wise pore segmentation tasks. This study revisits recent supervised (UNet, UNet++, UNet 3+, MSS-UNet, ACC-UNet) and unsupervised (VAE, ceVAE, gmVAE, vqVAE, RV-VAE) DL models for porosity analysis of AM samples from X-CT images and extends them to accept 3D input data with a 3D-patch approach for lower computational requirements, improved efficiency and generalisability. The supervised models were trained using the Focal Tversky loss to address class imbalance that arises from the low porosity in the training datasets. The output of the unsupervised models was post-processed to reduce misclassifications caused by their inability to adequately represent the object surface. The findings were cross-validated in a 5-fold fashion and include: a performance benchmark of the DL models, an evaluation of the post-processing algorithm, an evaluation of the effect of training supervised models with the output of unsupervised models. In a final performance benchmark on a test set with poor image quality, the best performing supervised model was UNet++ with an average precision of 0.751 ± 0.030, while the best unsupervised model was the post-processed ceVAE with 0.830 ± 0.003. Notably, the ceVAE model, with its post-processing technique, exhibited superior capabilities, endorsing unsupervised learning as the preferred approach for the voxel-wise pore segmentation task.

Deep learning models for hepatitis E incidence prediction leveraging Baidu index.

Infectious diseases are major medical and social challenges of the 21st century. Accurately predicting incidence is of great significance for public health organizations to prevent the spread of diseases. Internet search engine data, like Baidu search index, may be useful for analyzing epidemics and improving prediction. We collected data on hepatitis E incidence and cases in Shandong province from January 2009 to December 2022 are extracted. Baidu index is available from January 2009 to December 2022. Employing Pearson correlation analysis, we validated the relationship between the Baidu index and hepatitis E incidence. We utilized various LSTM architectures, including LSTM, stacked LSTM, attention-based LSTM, and attention-based stacked LSTM, to forecast hepatitis E incidence both with and without incorporating the Baidu index. Meanwhile, we introduce KAN to LSTM models for improving nonlinear learning capability. The performance of models are evaluated by three standard quality metrics, including root mean square error(RMSE), mean absolute percentage error(MAPE) and mean absolute error(MAE). Adjusting for the Baidu index altered the correlation between hepatitis E incidence and the Baidu index from -0.1654 to 0.1733. Without Baidu index, we obtained 17.04±0.13%, 17.19±0.57%, in terms of MAPE, by LSTM and attention based stacked LSTM, respectively. With the Baidu index, we obtained 15.36±0.16%, 15.15±0.07%, in term of MAPE, by the same methods. The prediction accuracy increased by 2%. The methods with KAN can improve the performance by 0.3%. More detailed results are shown in results section of this paper. Our experiments reveal a weak correlation and similar trends between the Baidu index and hepatitis E incidence. Baidu index proves to be valuable for predicting hepatitis E incidence. Furthermore, stack layers and KAN can also improve the representational ability of LSTM models.

A Comparison of Medical Education Policies in Japan and Singapore with a Focus on Governance: Implications for Korea

Among Asian nations, Japan, Singapore, and South Korea exemplify countries with high standards of medical quality. This review explores the differences in medical education policies between Japan and Singapore, particularly concerning governance, and discusses the implications for South Korea’s medical education policies. Relevant documents were analyzed by referencing scholarly articles and data from governmental and expert organizations in each country. In Japan, advances in medical education policies include initiatives such as the regional quota system and the core curriculum model, which emphasize stakeholder engagement and transparency. However, challenges persist due to limited stakeholder participation, necessitating a transition toward a more equitable governance paradigm. Singapore’s model features robust public-private partnerships with minimal direct governmental intervention, emphasizing innovation and community integration, as seen in the Healthier SG project. These case studies demonstrate effective governance involving significant stakeholder collaboration and strategic financial investments. Conversely, South Korea’s medical education policies face challenges from a predominantly government-centric approach, with an absence of cohesive governance structures and inadequate involvement from essential professional stakeholders. This situation has led to policy inconsistencies and a deficit of strategic direction, exacerbated by insufficient financial support for educational infrastructure and program development. The experiences of Japan and Singapore indicate that it would be beneficial for South Korea to adopt integrated governance frameworks that prioritize transparency and collaboration. Furthermore, increasing financial investment in medical education could mitigate existing deficiencies and improve the quality and effectiveness of its healthcare education system.

ECONOMIC AND LEGAL TRENDS OF EUROPEANIZATION OF THE ADMINISTRATIVE LAW OF UKRAINE

Today, it is appropriate to talk about cooperation between Ukraine and EU member states in matters that are functional for their legal systems. The first is the protection of the rights and freedoms of citizens; providing asylum to refugees from other countries; adaptation of legislation on the regulation of relations in the field of migration, both legal and illegal; fight against illegal employment; and others. It was found that the administrative law of Ukraine is developing in complex political-economic and social-legal conditions. Therefore, the use of European experience in the field of administrative and legal regulation of social relations in Ukraine should not imply mindless copying, which can negatively affect society and the state. The topic of the research should be the creation of national methodological recommendations on quality indicators of individual branches of law in accordance with the quality standards of legislation and law of the countries of the European Union. The introduction of European approaches to the regulation of social relations at the administrative and legal level in Ukraine must be balanced and adapted so that there is no negative impact on the development of society and the process of state formation. At the same time, the comparative legal study and rational use of foreign experience in the development of administrative law allows to significantly expand the so-called "legal field", enriching it with the experience of foreign countries. The current conditions for the development of administrative law in Ukraine depend on globalization, which affects all spheres of life, affecting the development of unified legal values and democratic principles of European administrative law, and the national administrative law system of individual European countries. In fact, there are two parties of subjects endowed with the corresponding rights and obligations in the field of administrative-legal relations.

Formulation of Ethanol Extract Cream of Sikkam Leaves (Bischofia javanica Blume) as an Antifungal Against Candida albicans

Skin health issues in Indonesia, including those caused by fungal infections such as (Candida albicans), can lead to various conditions like candidiasis, scabies, tungiasis, and leprosy. This study aims to evaluate the potential of sikkam leaf extract in developing an antifungal cream to combat (Candida albicans). Fungi are eukaryotic organisms that cannot photosynthesize and reproduce through branching filaments composed of hyphae. Fungi can thrive in diverse environments such as water, soil, and decaying organic matter. A cream is a semi-solid emulsion preparation in which one or more medicinal substances are dissolved or dispersed within a base. This formulation determines the cream’s effectiveness, including the optimal ethanol extract concentration needed for antifungal activity. Extraction of sikkam leaves was conducted using maceration with 70% ethanol, and creams were formulated with extract concentrations of 5%, 10%, and 15%. Data were analyzed using the Kruskal-Wallis test. The study results showed that sikkam leaf-based creams meet quality standards, including organoleptic properties, homogeneity, pH, spreadability, and physical stability. Effectiveness testing indicated that creams with 5%, 10%, and 15% concentrations produced inhibition zones against (Candida albicans) with average diameters of 6.3 mm, 9 mm, and 15.3 mm, respectively. The higher the extract concentration, the stronger the inhibition of fungal growth. The cream with a 15% concentration proved to be the most effective, with inhibition classified as strong. Thus, sikkam leaf extract shows potential as a key ingredient for antifungal cream formulations.

Effects of the Application of Organic Fertilizers on the Yield, Quality, and Soil Properties of Open-Field Chinese Cabbage (Brassica rapa spp. pekinensis) in China: A Meta-Analysis

With the development of sustainable agriculture, trials on the benefits of the application of organic fertilizers around the world have been conducted. Herein, we investigated the impact of the pure chemical fertilizers (CFs) combined with organic fertilizers compared with the application of CFs (100% CFs) and no fertilizers (NFs) on soil properties as well as the yield and quality of Chinese cabbage through meta-analysis. Results indicate that: (1) Compared with NFs, the application of organic fertilizers can significantly improve the yield and quality of Chinese cabbage and increase soil nutrients. (2) Compared with CFs, the application of organic fertilizers can increase the fresh weight, number of leaves, transverse diameter, leaf length, and development of Chinese cabbage per plant, with increases of 8.54%, 6.6%, 9.905%, 8.42%, and 10.03%; Meanwhile, organic fertilizers can significantly increase the yield (total amount of above-ground parts produced) and commercial yield (the portion that meets the required quality standards and is intended for sale) of Chinese cabbage to increase the yield and commercial yield by 10.08% and 35.56%, respectively. However, it has no significant impact on the income from growing Chinese cabbage. (3) Compared with CFs, the application of organic fertilizers can significantly increase the content of vitamin C (11.06%), soluble sugar (19.16%), and soluble protein (8.83%) and reduce the content of nitrate and nitrite in Chinese cabbage, with a reduction of up to 19.02% and 20.9%, respectively. The application of organic fertilizers will also have a certain impact on the absorption of heavy metals in Chinese cabbage. (4) Compared with CFs, the application of organic fertilizers can significantly improve soil organic matter, soil carbon sequestration, nitrogen absorption, and potassium absorption, showing increases of 12.73%, 13.19%, 7.91%, and 7.37%, and the application of organic fertilizers reduces soil electrical conductivity and available nitrogen, showing decreases of 36.78% and 38.75%, respectively. (5) The application of organic fertilizers significantly increased the content of soil urease and soil sucrase, increasing by 9.42% and 17.16%, respectively. This study helps inform the application of organic fertilizers in Chinese cabbage production.

Synthesis and Characterization of Lauha Bhasma

The preparation of ayurvedic bhasma is particularly challenging, as mass production in modern facilities often lacks the standardized equipment needed to ensure consistent quality, leading to concerns about toxic elements like mercury and arsenic in the final products. Addressing these concerns necessitates the standardization of the synthesis process through the implementation of stringent quality control measures at every stage of preparation. This study is dedicated to the synthesis and comprehensive characterization of lauha (iron) bhasma, employing both traditional methodologies and advanced analytical techniques. The synthesis process began with samanya shodhana (general purification), followed by vishesh shodhana (special purification) and marana (incineration) The resultant product then underwent amrutikaran, involving heating with aloe vera extract at an elevated temperature of 750°C.The synthesized lauha bhasma was meticulously characterized using a combination of classical Ayurvedic techniques and modern analytical methods, including Fourier Transform Infrared Spectroscopy (FTIR), Atomic Absorption Spectroscopy (AAS), X-ray Diffraction (XRD), Brunauer-Emmett-Teller (BET) surface analysis, Scanning Electron Microscopy (SEM), Particle Size Distribution (PSD), and Energy Dispersive X-ray (EDX) analysis. The final product, post-Amrutikaran, successfully passed all traditional Ayurvedic evaluations, affirming the proper formation of bhasma. XRD analysis revealed the formation of rhombohedral α-Fe₂O₃ with only trace amounts of free iron, indicating high purity. SEM and PSD analyses demonstrated the creation of nanosized particles ranging from 50 to 200 nm, complemented by a specific surface area of 12.55 m²/g as determined by BET studies. Crucially, EDX analysis confirmed that the amrutikaran process effectively eliminated mercury from the bhasma, ensuring its safety and compliance with stringent quality standards.

Effect of tunnel wash water treatment processes on trace elements, organic micropollutants, and biological effects

Tunnel wash water (TWW) contains high levels of trace elements and organic micropollutants, especially in the dissolved fraction. Discharge poses significant environmental risks. This field study aimed at improving conventional sedimentation treatment by addition of novel secondary treatments: bag filtration, ceramic microfiltration, or granular activated carbon (GAC) filtration. Removal of nine trace elements, 16 polycyclic aromatic hydrocarbons (PAHs), 38 per- and polyfluoroalkyl substances (PFASs), seven benzothiazoles (BTHs), seven benzotriazoles (BTRs), five bisphenols (BPs), and five benzophenones was investigated. Primary sedimentation significantly reduced particles and associated contaminants, achieving over 73 % average removal for trace elements, 65 % for PAHs, and 71 % for PFASs. Subsequent GAC removed over 70 % of dissolved Cr, Cu, Pb, and Zn and over 92 % of dissolved PFASs, BTHs, BTRs, and BPs, including several persistent, mobile and toxic compounds. Following GAC filtration, Cr, Ni, Pb, anthracene, fluoranthene, perfluorooctanesulfonic acid, and bisphenol-A were below environmental quality standards (EQS). GAC consistently reduced responses in in vitro bioassays with endpoints activation of the aryl hydrocarbon receptor, oxidative stress response, and neurotoxicity below effect-based trigger values for surface water. GAC filtration is thus recommended for future TWW treatment. Assessing water quality remains a challenging task due to lack of EQSs for many chemicals.

Effect of Waste PET Fiber on the Mechanical Properties and Chloride Ion Penetration of Emergency Repair Concrete for Road Pavement.

This study evaluated the effects of adding waste PET fibers on the mechanical properties and chloride ion penetration of latex-modified ultra-rapid hardening cement concrete used for emergency road pavement repairs. The primary experimental variable was the content of waste PET fibers. The mechanical properties of the concrete were evaluated through compressive strength, flexural strength, and splitting tensile strength tests. Its durability was evaluated through chloride ion penetration, surface resistivity, and abrasion resistance tests. The experimental results were compared with the quality standards for emergency repair concrete set by the Korea Expressway Corporation. As a result, this study has enhanced the strength and resistance to chloride ions of latex-modified concrete by incorporating waste PET fibers. In the mixture with 3.84 kg/m3 of waste PET fibers, the compressive strength was 29.9 MPa at 4 h and 42.5 MPa at 28 curing days. The flexural strength was 6.0 MPa at 4 curing hours and 7.0 MPa at 28 days, and the splitting tensile strength was 4.5 MPa at 28 days of curing. The chloride ion permeability amount and abrasion depth were 1081C and 0.82 mm, respectively. The mixture with 3.84 kg/m3 of waste PET fibers has superior compressive strength, flexural strength, splitting tensile strength, chloride ion penetration, and surface resistivity compared to the mixture with 7.68 kg/m3. This result means that the waste PET fibers caused poor dispersion and fiber-balling within the concrete, leading to loose internal void structures when incorporated at 3.84 kg/m3. However, the abrasion resistance test showed better results for the mixture with 7.68 kg/m3 of waste PET fibers than the 3.84 kg/m3 mixture. Therefore, the test results indicated that 3.84 kg/m3 of waste PET fibers is the most effective for latex-modified concrete used in emergency road pavement repairs.

Microbiology Test Results for White Edible Birds Nest with Fecal Contamination

Background: Southeast Asia's edible bird nest industry, particularly in Indonesia, has experienced rapid growth in recent years. Indonesia stands as the world's leading exporter of edible bird nests. However, concerns persist regarding the quality of edible bird nests produced in the country, specifically to do with meeting quality standards by ensuring freedom from microbial contaminants that can lead to foodborne illnesses. Purpose: To evaluate the microbiological contamination of cleaned edible bird nests sourced from Java Island, Indonesia. Cases(s): Yellow-brown discoloration of edible bird nests collected from bird houses of Javan origin. Case Management: Fifty samples of raw white edible bird’s nest samples (cup-shaped) with yellow-brown discoloration (n=25) originating from Java Island and raw white edible bird’s nest samples (cup-shaped) (n=25) were collected aseptically from the edible bird’s nest warehouses in Surabaya. These samples of edible nests from Java Island were subjected to microbiological analysis. The findings revealed a disconcerting trend, with 25 samples from Java Island exhibiting contamination by Escherichia coli (40%) and coliform bacteria (100%), surpassing established contamination thresholds. Conclusion: This raises critical concerns about the safety and quality of edible bird nests from the region, highlighting the need for enhanced production and processing practices, as well as rigorous quality control measures to ensure consumer safety and to maintain the industry's reputation on a global scale. Addressing these issues is imperative not only to safeguard public health but also to sustain and further develop the lucrative edible bird nest industry in Indonesia.

Implementing verifiable oncological imaging by quality assurance and optimization (i‑Violin) : Protocol for aEuropean multicenter study.

Advanced imaging techniques play apivotal role in oncology. Alarge variety of computed tomography (CT) scanners, scan protocols, and acquisition techniques have led to awide range in image quality and radiation exposure. This study aims at implementing verifiable oncological imaging by quality assurance and optimization (i-Violin) through harmonizing image quality and radiation dose across Europe. The 2‑year multicenter implementation study outlined here will focus on CT imaging of lung, stomach, and colorectal cancer and include imaging for four radiological indications: diagnosis, radiation therapy planning, staging, and follow-up. Therefore, 480 anonymized CT data sets of patients will be collected by the associated university hospitals and uploaded to arepository. Radiologists will determine key abdominopelvic structures for image quality assessment by consensus and subsequently adapt apreviously developed lung CT tool for the objective evaluation of image quality. The quality metrics will be evaluated for their correlation with perceived image quality and the standardized optimization strategy will be disseminated across Europe. The results of the outlined study will be used to obtain European reference data, to build teaching programs for the developed tools, and to create aculture of optimization in oncological CT imaging. The study protocol and rationale for i‑Violin, aEuropean approach for standardization and harmonization of image quality and optimization of CT procedures in oncological imaging, is presented. Future results will be disseminated across all EU member states, and i‑Violin is thus expected to have asustained impact on CT imaging for cancer patients across Europe.

Exploring Moringa oleifera: Green Solutions for Sustainable Wastewater Treatment and Agricultural Advancement

Increasing concerns over water pollution have driven the search for sustainable wastewater treatment alternatives. This study evaluates the effectiveness of two coagulants derived from Moringa oleifera seeds–powder and extract–as sustainable solutions for wastewater reuse in agriculture. Comparative experiments were conducted using aluminum sulfate, a conventional coagulant, at various doses under controlled laboratory conditions. The results demonstrated that both M. oleifera-based coagulants were highly effective, achieving turbidity reductions of 97% and 99%, respectively. Notably, the powder form required lower doses than the extract but had longer sedimentation times. Further detailed analyses at optimized doses (500 mg/500 mL for powder and 12.5 mL/500 mL for extract) met international standards for wastewater quality in agricultural irrigation. Comprehensive analyses encompassing pH, turbidity, COD, BOD5, TSS, DO, conductivity, NO2−, NO3−, SO42−, PO43−, and fecal and total coliforms consistently adhered to stringent criteria, confirming the effectiveness of M. oleifera-derived coagulants. These findings highlight the potential of M. oleifera in wastewater treatment, offering sustainable solutions to environmental challenges and enhancing food security in resource-limited regions. Our research supports the broader adoption of these eco-friendly alternatives, which could significantly reduce water scarcity and promote sustainable agricultural practices, addressing critical environmental concerns.

Clearing the Air to Address Pollution's Cardiovascular Health Crisis.

Air pollution is a critical global health issue that significantly impacts cardiovascular health. The air pollutant PM2.5 (particulate matter with a diameter of 2.5 micrometres or less) has been positioned as a leading environmental risk factor for morbidity and mortality, especially from cardiovascular diseases (CVDs). Using data from the World Health Organization (WHO), Global Health Observatory, and the United Nations Environment Programme, we explored global trends in air pollution, with a focus on PM2.5 levels, the implications for cardiovascular health, and the policy measures aimed at reducing their impact. Despite progress in reducing pollution levels in high-income countries, global trends show a limited annual reduction in PM2.5 concentration. The analysis highlights disparities between regions, with low- and middle-income countries bearing the brunt of air pollution-related CVDs. In 2019 alone, ambient air pollution was responsible for approximately 4.2 million deaths worldwide. Of these, 70% were caused by CVDs, with approximately 1.9 million deaths from ischemic heart disease and 900,000 deaths from stroke. Policy gaps remain a challenge, with many countries lacking adequate legally binding air quality standards. We recommend the adoption of WHO air quality guidelines, enhanced monitoring of air pollution levels, and increased investment in interdisciplinary research to understand the full scope of air pollution's effects on cardiovascular health. Addressing the global cardiovascular crisis linked to air pollution will require coordinated efforts from policymakers, healthcare systems, and global health organisations.

A retrospective study of Quality Control of Fresh Frozen Plasma (FFP) using Factor VIII levels in Central Blood Transfusion Services Indonesian Red Cross

Background: According to a report from the Ministry of Health of the Republic of Indonesia, there are 470 blood transfusion units in Indonesia (235 units managed by PMI, 220 units managed by the government, four units of health services provinces, nine units of vertical hospital BTUs, two unit’s Indonesian police and army hospital) distributed in 38 provinces. With so many BTUs spread throughout Indonesia, each BTU must have the same quality standards to maintain and improve blood services. Therefore, it is necessary to carry out Quality Control of the blood component products produced. Quality control is critical in safely and effectively processing blood and other components. A quality concept comprises quality control, assurance, and management. The laboratory service should have a quality control system. Quality testing and monitoring of blood components for transfusion have led to manufacturing or development. Factor VIII levels are internal quality control parameters required for quality analysis of Fresh Frozen plasma (FFP). As per international standard guidelines and government national regulations (PMK 91/2015) for quality assurance of FFP, 1% of all the units prepared, or four units per month, are tested for stable coagulation factors, including Factor VIII levels. Objective: This study aims to evaluate factor VIII levels in each units FFP to ensure the availability of high-quality products with maximum therapeutic and minimal risk to recipients. Methods: The retrospective data were collected from Research and Development CBTS Indonesian Red Cross archives from 1 January 2019 to 30 April 2023. Out of total 284 units FFP collected from Blood Transfusion Unit Indonesian Red Cross from Sumatera Island (Lampung Province, Palembang City, Pekanbaru City), DKI Jakarta Province (CBTS IRC), Jawa Barat Province (Depok City, District of Bekasi City, District of Bogor City), Banten Province (Tangerang City, District South of Tangerang City), Government Hospital (Fatmawati Hospital BTU), Army Hospital (RSPAD Gatot Soebroto BTU) were tested Quality Control with semi-automated Sysmex CA50 and automated Sysmex CA620 to determine of factor VIII levels in each unit FFP. Results: A total of 284 units of FFP were tested, and mean factor VIII levels were 1,2 IU/mL with a range of 0,3 IU/mL-5,3 IU/mL, the normal range measure being > 0,7 IU/mL. Only 4,9 % (14/284) FFP units were inappropriate from the standard, while 95,1 % (270/284) FFP units could be accepted criteria standard. Conclusion: We conclude that there are still those below-standard Quality FFP products from blood transfusion units; it is necessary to increase the processing of blood components so that the coagulation factors are maintained. From taking blood collecting, transporting, and shipping, it is required to carry out quality control to produce products that meet national and international standards.

Influence of Organizational Technology on Administrative Performance of Public Secondary Schools in Nakuru County, Kenya

The purpose of this study was to assess the influence of organizational technology on administrative performance in public secondary schools in Nakuru County, Kenya. The study adopted a mixed-method research design. The study targeted 352 principals in public secondary schools and 11 Sub-County Quality Assurance and Standards Officers in Nakuru County. Using stratified random sampling, a sample size of 106 principals and 4 Sub-County Quality Assurance and Standards Officers (30 % of the population) was selected. Data collection methods included questionnaires administered to principals and interviews conducted with Sub-County Quality Assurance and Standards Officers (SCQASO). Quantitative data were analyzed using descriptive and inferential statistics, including Pearson’s correlation and regression analysis, while qualitative data underwent thematic analysis. A pre-test involving 11 schools in Nyandarua County confirmed the reliability of the research instruments, yielding a Cronbach’s alpha of 0.805. The findings reveals a strong and significant correlation between organizational technology and administrative performance (r = 0.876, p = 0.004). It was concluded that organizational technology, significantly influenced the administrative performance of principals, ultimately enhancing school effectiveness. To improve public secondary school administration, it is recommended that operational efficiency be enhanced, and technology be integrated.

Influence of Organizational Roles on Administrative Performance of Public Secondary Schools in Nakuru County, Kenya

The purpose of this study was to assess the influence of organizational roles on administrative performance in public secondary schools in Nakuru County, Kenya. The study adopted a mixed-method research design. The study targeted 352 principals in public secondary schools and 11 Sub-County Quality Assurance and Standards Officers in Nakuru County. Using stratified random sampling, a sample size of 106 principals and 4 Sub-County Quality Assurance and Standards Officers (30 % of the population) was selected. Data collection methods included questionnaires administered to principals and interviews conducted with Sub-County Quality Assurance and Standards Officers (SCQASO). Quantitative data were analyzed using descriptive and inferential statistics, including Pearson’s correlation and regression analysis, while qualitative data underwent thematic analysis. A pre-test involving 11 schools in Nyandarua County confirmed the reliability of the research instruments, yielding a Cronbach’s alpha of 0.805. The study found that the correlation coefficients between organizational roles and administrative performance in public secondary schools in Nakuru County, Kenya (r = 0.567, p = 0.002) was strong and significant. Organizational role significantly influenced the administrative performance of principals, ultimately enhancing school effectiveness. To improve public secondary school administration, it is recommended that clearly defined administrative roles be established.

Removal of contaminants in paper dyeing wastewater by Fenton and photo-Fenton processes with biological treatment

Due to the production of huge quantity of potentially toxic and recalcitrant pollutants, which cannot be completely decomposed with conventional biological wastewater treatment processes, in the paper industry, reliable treatment processes are highly required. This study conducted effective experiments of different series of processes to decompose persistent contaminants in the paper wastewater under controlled conditions of the used processes to meet the effluent quality standards of Korea Ministry of Environment in terms of CODMn (< 130 mg/L). For Biological treatment, Fenton, and photo-Fenton processes, various operational parameters were adjusted to determine the optimal conditions for CODMn value. Due to large quantity of refractory contaminants in the wastewater, single treatment process was not enough to meet the requirement of CODMn. Herein, we achieved the goal with two approaches: (1) secondary Fenton oxidation after biological and primary Fenton treatments, and (2) photo-Fenton treatment after biological treatment alone. The secondary Fenton oxidation process is an additional process operated under the same condition of the primary Fenton treatment to treat the effluent from the primary Fenton treatment. Ultimately, the residual CODMn concentrations of the secondary Fenton and single photo-Fenton treatment were 62.7 and 85.3 mg/L, respectively. However, the secondary Fenton required larger amounts of reagents and produced significant amounts of sludge, which require post-treatment, compared to single photo-Fenton treatment. Therefore, it suggests that the application of photo-Fenton was more efficient than the secondary Fenton in terms of economic feasibility and post-treatment requirement.

Evaluation of Groundwater Quality Through Identification of Potential Contaminant

Groundwater, is crucial for human consumption and industrial purposes, demands continuous monitoring to assess quality standards. This study conducts a comprehensive evaluation of groundwater quality to assess its overall condition and identify potential contaminants. The research predicts the presence and levels of contaminants such as heavy metals, organic pollutants, and microbial agents using hydrogeological studies, chemical analysis, and statistical modelling. A covariance analysis identified places with low water quality. Analysis shows most samples satisfy drinking water requirements. A consolidated map illustrates a significant expanse suitable for domestic and drinking purposes, particularly in terms of drinking water quality. However, water quality in 2467.09 sq. km is deemed unacceptable. Further analysis, including correlation, ANOVA, and t-tests such as One Sample Test, Bayesian Statistics, and Power Analysis, identifies 836.87 sq. km under the category of maximum permissible water quality and 9.19 sq. km as highly desirable for drinking and domestic use.

PELATIHAN PEMANFAATAN LIMBAH PERTANIAN SEBAGAI PUPUK ORGANIK DI KELURAHAN KALAMPANGAN KECAMATAN SEBANGAU KOTA PALANGKA RAYA

Kalampangan Village is known as a transmigration area that has advanced in the agricultural sector, especially vegetable crops and is the largest supplier of vegetables in Palangka Raya City. One effort to increase peat soil fertility is through fertilization. So far, fertilization has mostly used inorganic fertilizers. Excessive inorganic fertilizer can disrupt soil health, besides being expensive and sometimes rare on the market. Farmers now cannot clear land by burning it, so that the resulting weeds pile up around the land. At harvest time, a lot of harvest waste is not utilized optimally. So far, it has only been buried in the ground fresh as green manure and animal feed. One effort to overcome the problem of accumulated weeds and crop residue is to make organic fertilizer (compost). Compost contains nutrients that plants need and is able to repair soil structure damaged by too much inorganic fertilizer. The objectives of the activity are: 1) Utilizing agricultural waste as organic fertilizer; 2). Providing skills in making quality organic fertilizer. The method used is counseling and training in making organic fertilizer. The extension and training activities were attended by 10 members of the farmer group. Training on making compost was carried out using broadleaf weeds and sweet corn harvest waste. Composting is carried out for 3 weeks to 1 month. The characteristics of compost that is ready to use are blackish brown color, crumb structure, coolness and compost aroma. The compost produced is of sufficient quality with the nutrient content N, P and K meeting organic fertilizer quality standards. Farmers are very enthusiastic about making compost and hope that later it can be applied in growing vegetables in Kalampangan Village.

Implications of What Works Clearinghouse Guidelines on Single-Case Design: An Investigation of Empty Training Phases

The What Works Clearinghouse quality standards provide guidance regarding studies capable of supporting evidence-based practices. Standards concerning single-case designs have been extensively revised to accommodate new evaluation methods, such as the design comparable effect size. These designs often omit data in which children and other participants receive training. Recently, the What Works Clearinghouse suggested studies with such “empty training phases” do not meet minimum standards of evidence. However, evidence regarding the effect of empty training phases on results is limited. This study used a subset of single-case design data from a recent meta-analysis to simulate studies with empty training phases. We calculated design-comparable effect sizes, evaluated differences between simulated and unsimulated data, and conducted random effects meta-analyses. Effects of simulated studies with artificially designed empty training phases were nearly four times as large as effects of the original, unaltered data. Guidance for intervention researchers follows a description of findings.