University of Singaperbangsa Karawang (Indonesian: Universitas Singaperbangsa Karawang) is the first university to be established in Karawang. It was established on 2 February 1982.The university is named Raden Adipati Singaperbangsa, founder of Karawang under Sultan Agung of Mataram. On October 6, 2014 UNSIKA became a public university..
This article investigates Government Regulation No. 17 of 2025 on child protection in Indonesia, particularly regarding digital platforms and platform capitalism. Using Cultural Political Economy and Critical Discourse Analysis, the study shows how the state, through this regulation, aims to reclaim authority from global platform algorithms, presenting it as child protection. The state acts as both protector and regulator within the data economy, positioning children as strategic assets. Through this regulation, the state incorporates platform capitalism into the national administrative framework, creating a layered surveillance structure among state, family, and platforms. The research identifies tensions between child protection objectives and policy implementation ramifications, while highlighting civil society reactions and enforcement gaps. The findings contribute to digital rehegemony theory, showing Global South countries often integrate platform capitalism into national policy without challenging algorithmic exploitation.
Rapid and label-free detection of microalgae is increasingly required for environmental surveillance and bio-industrial process control, where decisions must be made from subtle interfacial changes rather than from bulk concentration alone. In this work, chromium (Cr) thin films (20-75 nm) were deposited by RF magnetron sputtering and evaluated by spectroscopic ellipsometry (SE) to develop a thickness-optimized optical transducer for microalgae biosensing. Thickness-dependent optical constants (n, k) were extracted using a Drude-Lorentz dispersion model incorporating an effective-medium roughness layer. The 75 nm film exhibited the most bulk-like and spectrally stable response with comparatively low effective loss across the visible range, while 20-30 nm films showed larger deviations attributable to microstructure- and interface-mediated scattering contributions in the ultra-thin regime. Biosensing was implemented by forming Cr/PVA and Cr/PVA + microalgae stacks and quantifying the differential phase response. The 75 nm Cr/PVA platform delivered the strongest microalgae-induced modulation, exhibiting a Δ phase shift of 40.6° within 2.65-3.20 eV, thereby identifying a high-contrast spectral window for detection. Machine learning was required because Ψ-Δ spectra are high-dimensional, nonlinear, and strongly correlated, and multilayer spectral blending (Cr/PVA/biological loading) limits reliable thresholding and linear separation. A multitask deep neural network was trained to learn the coupled Ψ-Δ response for rapid prediction, and support vector machines were used for supervised discrimination of film stacks. By converting dense SE signatures into decision-ready labels on a thickness-optimized substrate, the proposed SE-ML framework advances an intelligent, non-destructive route for rapid microalgae screening and environmental diagnostics.
In this work, a sustainable calcium oxide (CaO) photocatalyst derived from discarded eggshells was synthesized and utilized for diazinon degradation under visible-light irradiation (halogen lamp, 400-700 nm). The preparation involved calcining cleaned and ground eggshells at 800 degrees C, impregnating them with KOH, followed by a secondary calcination at 450 degrees C to improve surface alkalinity and active site formation. Characterizations using SEM-EDX, FTIR, UV-Vis, and BET confirmed a mesoporous texture with a relatively high surface area and a UV absorption edge accompanied by a weak tail extending into the visible region. The photocatalytic performance was systematically investigated under varying conditions of pH (3-11), initial diazinon concentration (30-210 mg/L), catalyst dosage (4-32 mg), light intensity (50-150 W), and irradiation time (0-240 min). Optimization using the Taguchi method identified irradiation time as the most critical factor, achieving a maximum degradation efficiency of 69.21% under optimal conditions (pH 7, 16 mg catalyst, 150 W illumination, 90 min). The degradation followed pseudo-first-order kinetics with an apparent rate constant (kobs) of 0.009375 min- 1. The reuse test showed a progressive activity loss upon cycling, indicating that stability improvement remains necessary. A reaction pathway is proposed in which light-assisted activation and surface-driven processes promote the formation of reactive species such as hydroxyl (center dot OH) and superoxide radicals (center dot O2- ) that contribute to diazinon oxidation. This study demonstrates an eco-friendly valorization pathway for eggshell waste into an efficient, recyclable, and low-cost photocatalyst for pesticide-contaminated water remediation.
Lanthanum ferrite (LaFeO3) perovskite offers high structural stability and strong visible-light absorption, yet its optoelectronic response is frequently limited by trap-assisted losses and non-radiative recombination. Here, we systematically assess site-specific Mg doping by comparing substitution at La3+ (A-site) and Fe3+ (B-site) in LaFeO3 thin films, and we establish a unified structure-defect-property correlation by combining XRD, FE-SEM, UV-Vis DRS, PL, XPS, dark electrochemical impedance spectroscopy, and DFT(+U) defect formation-energy calculations. Moderate B-site Mg substitution (x = 0.1, LFM01) delivers the most favorable film quality, with compact grains and a controlled oxygen-vacancy population. Power-dependent PL yields beta values approaching unity (beta approximate to 1.0), narrower emission linewidths, and negative exciton binding energies, consistent with a defect-optimized regime where recombination becomes more delocalized and band-to-band-like. In contrast, A-site Mg doping (LMF01) exhibits a higher beta exponent (beta approximate to 1.3) together with positive exciton binding energies and broadened, strongly quenched PL, indicating recombination dominated by deep, strongly localized non-radiative traps. At higher B-site loading (LFM03), vacancy clustering drives a defect-saturated regime marked by reduced PL efficiency, broader emission, and beta < 1 (beta approximate to 0.9). Dark EIS identifies LFM01 as the most conductive film (lowest transport resistance), while DFT confirms Fe-site Mg is thermodynamically favored and lowers the oxygen-vacancy formation energy, rationalizing the coupled defect, photophysical, and transport trends. These findings highlight the critical role of dopant site selectivity in modulating defect states and recombination dynamics, offering valuable insights for optimizing LaFeO3-based materials for future optoelectronic technologies.
Objectives. This quasi-experimental study aimed to evaluate the effectiveness of the Healthy Lifestyle Program (HLP), integrated into regular physical education classes, in enhancing physical literacy and physical fitness among junior high school students aged 13–14, while addressing sedentary behaviors associated with high screen time and limited outdoor play. Materials and Methods. Seventy-two eligible students (mean age = 13.6 ± 0.4 years; 19 males and 17 females per group) were allocated to an experimental group (EXP; n = 36) or a control group (CON; n = 36) using a non-random assignment based on intact classes, consistent with a quasi-experimental design. The EXP group participated in the HLP, which consisted of weekly 80-minute sessions incorporating warm-up activities, motor skill activation, fitness circuits, small-sided games, classroom active breaks, and home-based physical activity assignments at a target intensity of Borg RPE 12–14, complemented by weekly healthy lifestyle education. The CON group followed the standard physical education curriculum. Physical literacy was assessed using the Indonesian-adapted Adolescent Physical Literacy Questionnaire (APLQ; Cronbach’s α = 0.951), and physical fitness was measured using the Indonesian Physical Fitness Test (TKJI; validity = 0.720; reliability = 0.920). Inter-rater reliability was high (APLQ ICC = 0.82; TKJI ICC = 0.88). Program content validity was confirmed using Aiken’s V (0.94). Data were analyzed using descriptive statistics, Shapiro–Wilk tests for normality, Levene’s tests for homogeneity, and MANOVA with partial η² effect sizes. Results. Baseline scores were comparable between groups. The EXP group demonstrated substantial improvements in physical literacy (gain = 24.75 ± 14.52) and physical fitness (gain = 6.94 ± 2.51), whereas the CON group showed minimal change (physical literacy gain = −0.44 ± 2.18; physical fitness gain = 0.08 ± 0.60). MANOVA revealed a significant multivariate effect (Wilks’ Λ = 0.180, p < 0.001), with large effect sizes for both physical literacy (η² = 0.602) and physical fitness (η² = 0.785). All statistical assumptions were met. Conclusions. The Healthy Lifestyle Program significantly improved physical literacy and physical fitness among early adolescents. These findings support the integration of educationally grounded, multicomponent lifestyle programs into school curricula, such as Kurikulum Merdeka, to address sedentariness using accessible and contextually appropriate resources. Future research should examine longer intervention durations and more diverse socioeconomic contexts.
