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All Journal Jurnal Psikologi Islam Environmental and Materials
Nurhalimah, Dede
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Religion Humanities Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Energy Engineering Physics Social Sciences

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Carbon-coated nickel foam for hypochlorous acid sensor Sanjaya, Afiten Rahmin; Riyanto, Hanzhola Gusman; Rahmawati, Isnaini; Putri, Yulia Mariana Tesa Ayudia; Nurhalimah, Dede; Saepudin, Endang; Tesla, Yudistira; Krisnandi, Yuni Krisyuningsih
Environmental and Materials Vol. 1 No. 1: (June) 2023
Publisher : Institute for Advanced Science, Social, and Sustainable Future

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61511/eam.v1i1.2023.105

Abstract

The electrochemical detection method of hypochlorous acid (HOCl) using carbon foam electrodes have been successfully developed. The carbon foam was prepared from carbon-coated nickel foam which is synthesized using a hydrothermal-carbonization method. SEM characterization indicated that the optimum synthesis of carbon-coated nickel foam has been achieved on the 4th layer coating process with an expected spherical structure, while characterization using FTIR and Raman spectroscopy confirmed the formation of graphitic material with D band and G band characteristics. An electroactive surface area of ​​0.0236 cm2 was achieved. Cyclic voltammetry of HOCl in 0.1 M phosphate buffer solution pH 6.0 showed the best current response for HOCl reduction occurs at a potential of -0.3 V (vs. Ag/AgCl). Further detection of HOCl using amperometry technique in the concentration range of 2-200 μg/mL showed good linearity with sensitivity of 9.112 mA/µg/L and an estimated detection limit of 1.96 µg/mL. Good repetition is indicated by the RSD value of 2.499 % (n=5). This developed sensor also showed good selectivity in the presence of interference compounds, such as FeCl2 and CuSO4. Besides, the determination of HOCl in tap water has been successfully conducted and generated a comparable result with the UV-VIS method (3.30 µg/mL hypochlorite). The results indicated that the developed sensor is promising for the detection of HOCl in environmental applications.
Pengaruh Frekuensi Berdzikir terhadap Tingkat Kecemasan Praktikum pada Mahasiswa Psikologi Nurhalimah, Dede; Rohman, Ujang; Ismail, Shalahudin
Jurnal Psikologi Islam Vol. 11 No. 1 (2024): Jurnal Psikologi Islam
Publisher : Asosiasi Psikologi Islam (API) Himpsi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47399/jpi.v11i1.263

Abstract

Penelitian ini bertujuan untuk menguji apakah frekuensi berdzikir berpengaruh terhadap tingkat kecemasan yang muncul pada mahasiswa Psikologi dalam mengikuti praktikum participation chart di Bandung. Kecemasan akademik sering kali menjadi hambatan bagi mahasiswa ketika harus menghadapi situasi evaluatif, sehingga perlu dikaji faktor-faktor yang berpotensi memengaruhinya, termasuk aktivitas spiritual seperti berdzikir. Penelitian ini menggunakan metode kuantitatif dengan pendekatan regresi linear sederhana. Data dikumpulkan melalui kuesioner dengan jumlah partisipan sebanyak 33 mahasiswa. Uji regresi menunjukkan hasil P-value = 0,360 yang lebih besar dari 0,05, sehingga dapat disimpulkan bahwa frekuensi berdzikir tidak memiliki pengaruh signifikan terhadap tingkat kecemasan mahasiswa dalam konteks praktikum tersebut. Hasil ini menunjukkan bahwa meskipun berdzikir dapat memberikan ketenangan secara subjektif bagi sebagian individu, secara statistik tidak terbukti memengaruhi tingkat kecemasan praktikum participation chart. Temuan ini memberikan implikasi bahwa faktor kecemasan mahasiswa mungkin lebih dipengaruhi oleh variabel lain, seperti strategi coping, dukungan sosial, atau kepercayaan diri. Penelitian lanjutan dengan jumlah sampel lebih besar dan melibatkan variabel moderator maupun mediator disarankan agar diperoleh gambaran lebih komprehensif mengenai hubungan antara aktivitas spiritual dan kecemasan akademik.
Co-Authors Endang Saepudin, Endang Ismail, Shalahudin Putri, Yulia Mariana Tesa Ayudia Rahmawati, Isnaini Riyanto, Hanzhola Gusman Sanjaya, Afiten Rahmin Tesla, Yudistira Ujang Rohman, Ujang Yuni Krisyuningsih Krisnandi, Yuni Krisyuningsih