Universitas Ahmad Dahlan Journal
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Research on Epidermis and Epidermal Derivates of Bitter Mustard (Brassica juncea L.) and Petsai Mustard (Brassica pekinensia L.) Leaves in Batang Regency
Get PDFThis research is an exploratory study conducted in Batang Regency. The research samples, namely bitter mustard (Brassica juncea L.) and petsai (Brassica pekinensia L.) leaves, were collected in December 2022. The selection of research samples is based on the level of production and availability. The data analysis method used in the research is descriptive quantitative analysis. The results showed that bitter mustard (Brassica juncea L.) and petsai mustard (Brassica pekinensia L.) have the same epidermal characteristics, namely irregularly shaped epidermal cells with notched cell wall edges and elongated polygonal cells with flat cell wall edges. The epidermal derivatives found are stomata and trichomes. The stomata of the study sample have anisocytic type, closed slit condition, but have different sizes (length and width), index and density. Trichomes have a simple needle-like hair type on the edge of the leaf, but have different sizes (length and width). The differences in the research samples can be observed quantitatively
A SECURE APPROACH TO FINANCIAL DOCUMENT AUTHENTICATION USING SECURE HASH ALGORITHM – 256
Get PDFThe advancement of technology is currently accelerating. Many financial transactions are now completed online in digital format. Financial statements, audits, and other important financial documents are stored and shared online. In this situation, financial record security is critical, particularly in preventing document alteration or forgery. Some examples of financial document breaches in 2022 include BI, PTC, PLN, JMTO, and others. Financial document authentication procedures must be implemented to ensure their integrity and validity. Coding is a subset of mathematics that is used in the workplace, such as the Secure Hash Algorithm - 256 (SHA-256). It has several advantages that are far superior to others. To improve the security and trustworthiness of electronic financial documents, this study will use the SHA-256 authentication algorithm to ensure that no financial data is leaked to parties who should not receive it
ANALISIS KESALAHAN MAHASISWA DALAM MENYELESAIKAN SOAL PERTIDAKSAMAAN
Get PDFSalah satu mata kuliah yang sangat penting dalam perkuliahan, karena akan menjadi bekal mahasiswa ketika sudah menjadi seorang pendidik baik di jenjang SD, SMP maupun SMA. Tujuan penelitian ini adalah mendeskripsikan kesalahan dan jenis kesalahan mahasiswa dalam menyelesaikan soal pertidaksamaan pada mata kuliah Aljabar Elementer. Instrumen penelitiannya adalah lembar tes dan lembar wawancara. Jenis penelitian ini adalah deskriptif kalitatif. Dalam mendeskripsikan kesalahan dan jenis kesalahan mahasiswa diambil subjek penelitian 6 mahasiswa dari kelas penelitian, selanjutnya dilakukan wawancara untuk menggali informasi lebih detail. Manfaat penelitian ini adalah setelah mengetahui kesalahan dan jenis kesalahan dapat dilakukan penelitian lanjutan untuk mengatasi permasalahan tersebut dikemudian hari. Pengambilan subjek dalam penelitian ini berdasar pada keberagaman jenis kesalahan yang dilakukan mahasiswa dan soal tes berupa soal uraian sebanyak tiga soal. Analisis data yang dilakukan meliputi uji instrumen, reduksi data dan penarikan kesimpulan. Berdasarkan analisis data kesalahan dari 6 subjek penelitian diperoleh hasil paling sering dilakukan tiap nomor terletak pada kesalahan keterampilan yaitu dilakukan oleh 5 subjek, dilanjutkan dengan kesalahan konsep yang dilakukan oleh 3 subjek dan yang jarang dilakukan adalah kesalahan pemecahan masalah yang dilakukan oleh 2 subjek. Berdasarkan tingkat kemampuan mahasiswa diperoleh untuk subjek dengan kemampuan tinggi melaukan kesalahan keterampilan, sedangkan subjek kemampuan sedang melakukan kesalahan keterampilan dan kesalahan konsep dan untuk subjek kemampuan rendah melakukan kesalahan keterampilan dan pemecahan masalah
Developing Data Centralization Interactive Media for 7th Grade Students’ Statistical Literacy Using SAC Application
Get PDFThe aim of this research is to develop interactive media that utilizes the Smart Apps Creator (SAC) application with a focus on statistical literacy, especially on data centralization material for grade 7 students. The development of this media follows the steps in the ADDIE model, namely analysis, design, development, implementation, and evaluation. This research involved 25 7th-grade students from SMP Muhammadiyah 3 Depok Sleman as research subjects. The instruments used in this research include interviews, validation questionnaires from material and media experts, and student response questionnaires. Based on research findings, interactive media developed with the Smart Apps Creator (SAC) application is proven to be valid and practical. The results of the material expert assessment were 80% which met the valid category. While the media expert assessment was 81.48% met the very valid category. The practicality criteria were obtained from the results of student responses with a percentage of 79.44% which also fell into the practical category indicating that the media is suitable for use in teaching. Thus, interactive media based on SAC can be an effective alternative to improve student understanding and motivation when studying data centralization material
Perceived Organizational Support and Lecturer Professionalism: The Mediating Role of Job Satisfaction
Get PDFLecturer professionalism is a crucial determinant of higher education quality, particularly in institutional contexts with limited structural support. This study examines the influence of Perceived Organizational Support (POS) on lecturer professionalism, with job satisfaction tested as a mediating variable. Employing a quantitative explanatory design, the study involved 293 certified lecturers under the coordination of KOPERTAIS Region IX, North Sumatra. Data were analyzed using Partial Least Squares Structural Equation Modeling (PLS-SEM) with SmartPLS 3.0. The results revealed that POS had no direct and significant effect on lecturer professionalism (β = 0.130; p = 0.082), but significantly affected job satisfaction (β = 0.728; p = 0.000). Job satisfaction, in turn, exerted a significant positive effect on lecturer professionalism (β = 0.474; p = 0.000) and fully mediated the relationship between POS and professionalism (β = 0.345; p = 0.000). These findings suggest that perceptions of organizational support enhance lecturer professionalism only when translated into positive work experiences that foster psychological and affective job satisfaction. The study underscores the practical importance of adopting relational and humanistic approaches in academic human resource management to strengthen and sustain lecturer professionalism
Implementasi Kriptografi AES dan Chaotic Steganografi LSB pada Pengamanan Data Kependudukan
Get PDFPerkembangan teknologi digital yang pesat telah membawa dampak signifikan terhadap pengelolaan dan penyimpanan data pribadi, khususnya data kependudukan seperti Nomor Induk Kependudukan (NIK), nama lengkap, alamat, serta tempat dan tanggal lahir. Data-data ini memiliki nilai strategis dan sangat rentan terhadap berbagai bentuk penyalahgunaan, mulai dari pencurian identitas, peretasan akun, hingga penipuan berbasis data pribadi sehingga membutuhkan sistem pengamanan informasi yang tidak hanya andal dan efisien, tetapi juga mampu menyamarkan data agar tidak mudah terdeteksi oleh pihak yang tidak berwenang. Penelitian ini bertujuan untuk memberikan metode pengamanan data kependudukan dengan menggunakan kombinasi kriptografi AES dan steganografi Chaotic LSB. Data kependudukan dienkripsi dengan AES disembunyikan secara acak menggunakan chaotic LSB kedalam media citra digital e-ktp yang hanya memuat foto dan nama. Hasil studi literatur dan simulasi konseptual menunjukkan bahwa kombinasi metode ini mampu menjaga kualitas citra digital dengan nilai Peak Signal-to-Noise Ratio (PSNR) lebih dari 30 dB, yang berarti tidak terjadi degradasi visual yang signifikan. Temuan ini mengindikasikan bahwa pendekatan tersebut dapat diimplementasikan secara efektif dalam sistem administrasi kependudukan berbasis digital untuk menjaga kerahasiaan dan integritas data. Dengan demikian, metode ini berpotensi menjadi solusi komprehensif dalam menghadapi tantangan keamanan data kependudukan di era digital
Prebiotic effect of purple sweet potato resistant starch and the development of its mucoadhesive granule formulation
Get PDFPurple sweet potatoes are recognized for their prebiotic properties including againts Lactobacillus casei and L. bulgaricus bacteria. This prebiotic effect is due to the high starch content in purple sweet potatoes. The amylose content in starch which is difficult to digest in gastointestinal tract, functions as a prebiotic. To enhance the prebiotic effect of purple sweet potato starch, modification into resistant starch can be performed. Resistant starch exhibits a higher prebiotic effect compared to regular starch because it cannot be broken down by digestive enzymes, allowing it to reach the large intestine in significant amounts. Additionally, the prebiotic effect can be further enhanced by creating mucoadhesive granule formulations that increase the contact time of a substance on the mucosa of the digestive tract. This study aims to evaluate the prebiotic effect of resistant starch from purple sweet potatoes and to develop its mucoadhesive granule formulation. The resistant starch from purple sweet potatoes was prepared using the heat moisture treatment method. The prebiotic activity of resistant starch was tested against Lactobacillus acidophilus and Escherichia coli. The granule formulation was prepared by varying the concentration of polymers used, namely a combination of HPMC and carbopol as mucoadhesive polymers. The results showed that resistant starch from purple sweet potatoes had a prebiotic index of 0.930. The granule formulation F3 with an HPMC and Carbopol polymer ratio of 1:2 was identified as a good mucoadhesive granule formulation. It met pharmaceutical evaluation with a mucoadhesive percentage value of 40%
Formulation and in-vitro antioxidant evaluation of α-mangostin, piperin, curcumin in oral patch and their combination
Get PDFNatural antioxidants have been developed in various formulations as alternatives to reduce the side effects associated with synthetic antioxidants. α-Mangostin exhibits strong antioxidant properties, although its behavior in combination with other herbal compounds remains unclear. The aim of this study was to formulate a combination of α-M, piperine, and curcumin into an oral patch and to evaluate the antioxidant properties of α-M when combined with piperine and curcumin, both known natural antioxidants. The oral patches were prepared by incorporating the active compounds (α-mangostin, piperine, and curcumin) into a matrix of hydroxypropyl methylcellulose (HPMC), gelatin, and chitosan. Glycerin was added as a plasticizer. Organoleptic assessment, along with evaluations of pH, weight, folding endurance, and moisture absorption capacity, confirmed the successful formulation of α-mangostin (MP), piperine (PP), curcumin (CP), and combination (MPCP) patches as oral delivery systems. All patches maintained a pH above 5.5. The thicknesses of MP, PP, CP, and MPCP were measured at 0.14 ± 0.02 mm, 0.17 ± 0.01 mm, 0.15 ± 0.02 mm, 0.11 ± 0.01 mm, and 0.16 ± 0.02 mm, respectively. The combination of these natural compounds enhanced folding endurance compared to the individual curcumin and piperine patches, while slightly reducing antioxidant activity. The co-formulation of α-mangostin, piperine, and curcumin into a single oral patch demonstrated a modest decline in antioxidant capacity. This study aimed to assess the impact of combining multiple antioxidant-rich natural compounds within a single delivery system
The effect of spiritual intelligence and self-control on nomophobia in Islamic Education Students at Muhammadiyah University
Get PDFNomophobia, the fear of being without a smartphone, is increasingly prevalent among university students and may be influenced by psychological factors such as spiritual intelligence and self-control. Several studies have demonstrated that these psychological factors play a significant role in nomophobic tendencies among college students. This quantitative study employs multiple regression analysis to examine the influence of spiritual intelligence and self-control on nomophobia in a sample of 99 Islamic Education students at Muhammadiyah University of Yogyakarta, selected through simple random sampling. Data were collected using validated instruments the NoMoPhobia Questionnaire (NMP-Q), the Spiritual Intelligence Self-Report Inventory, and a self-control self-report scale. Data analysis included descriptive statistics, classical assumption tests, and multiple linear regression using SPSS version 26. Descriptive analysis revealed that 67.68% of students exhibited high spiritual intelligence, 67.67% demonstrated moderate self-control, and 92.92% experienced high levels of nomophobia. Multiple regression analysis revealed that spiritual intelligence had a significant positive effect on nomophobia (β=0.277, p=0.004), whereas self-control had a significant negative effect (β=-1.015, p<0.001). The model explained 67% of the variance in nomophobia (R²=0.670, Adjusted R²=0.663), indicating a strong influence. However, the R² value of 0.276 mentioned elsewhere suggests moderate explanatory power, which may require clarification. Both spiritual intelligence and self-control significantly affected nomophobia among university students. These findings underscore the importance of developing spiritual intelligence and self-control to reduce nomophobia levels in this population
The effect of a culturally responsive teaching approach using digital comics on critical thinking skills in photosynthesis learning
No full textLearning in the 21st century highlights the need to enhance students' critical thinking abilities by incorporating information and communication technology. This study examines the effect of the Culturally Responsive Teaching (CRT) approach using digital comics on the critical thinking skills of fourth-grade students in learning about photosynthesis. The aspects of critical thinking measured include analysis, evaluation, and interpretation. This study employed a quasi-experimental design with a non-equivalent control group, involving 62 students who were assigned to either the experimental or control group. The independent samples t-test revealed a statistically significant difference between the experimental and control groups (p = 0.024), indicating that students taught using CRT-based digital comics demonstrated better critical thinking performance than those taught using conventional methods. The digital comics integrated local cultural values, such as traditional beverages, indigenous plants, and everyday community practices, making the learning process more contextual and meaningful. This study highlights the potential of CRT-based digital comics to enhance students’ cognitive skills and offers an innovative model for integrating cultural relevance into elementary science education