Universitas Maritim Raja Ali Haji Pusat Jurnal Ilmiah
Not a member yet
76813 research outputs found
Sort by
Evaluasi Hematologi Ikan Kakap Putih (Lates calcarifer) yang Diberi Pakan Mengandung Probiotik
No full textThis research is about the effect of giving probiotic booster aquaenzyms to feed at different doses to look at the parameters of red blood cells, white blood cells and leukocyte differential. This study aims to analyze the effect of adding probiotic booster aquaenzyms in pelleted feed on blood hematological parameters of sea bass, with a focus on observing the number of erythrocytes, leukocytes and leukocyte differential. This research was conducted from May to June 2025 for 14 days at the Marine Aquaculture Lab, Aquaculture Study Program, Faculty of Marine Sciences, Raja Ali Haji Maritime University, Tanjungpinang. The research design used in this study used a Completely Randomized Design (CRD) with 4 treatments and 3 replications, namely control feed treatment without probiotic booster aquaenzyms and injected with bacteria, Treatment A feed with probiotic booster aquaenzyms 2 grams/kg feed every day and injected with bacteria, Treatment B feed with booster aquaenzyms 6 grams/kg feed every day and injected with bacteria, Treatment C with probiotic booster aquaenzyms 10 grams/kg of feed every day and challenge the Vibrio alginolyticus bacteria. The parameters observed during the research were, red blood cells (erythrocytes), white blood cells (leukocytes), leukocyte differential, survival rate, and water quality parameters. Data analysis used Microsoft Excel and data was analyzed using analysis of variance (ANOVA). Statistical analysis was carried out using SPSS software. If the data is significantly different (P<0.05), then Duncan\u27s further test is carried out. The research results from the addition of probiotic booster aquaenzyms in pelleted feed were highest in treatment A with a dose of 2 grams/kg of feed on red blood cells and white blood cells. The differential leukocytes obtained during the study were lymphocytes and monocytes. The highest lymphocytes were obtained in treatment B, and the highest monocytes were obtained in treatment K. The highest survival rate was in treatment A.Penelitian ini mengenai pengaruh pemberian probiotik boster aquaenzyms terhadap pakan dengan dosis yang berbeda untuk melihat parameter sel darah merah, sel darah putih, dan diferensial leukosit. Penelitian ini bertujuan untuk menganalisis efek penambahan probiotik boster aquaenzyms dalam pakan pellet terhadap parameter hematologi darah ikan kakap putih, dengan focus pada mengamati jumlah eritrosit, leukosit, dan diferensial leukosit. Penelitian ini dilakukan pada bulan Mei hingga Juni 2025 selama 15 hari di Lab Marine Aquaculture, Prodi Budidaya Perairan, Fakultas Ilmu Kelautan, Universitas Maritim Raja Ali Haji, Tanjungpinang. Rancangan penelitian yang digunakan pada penelitian ini menggunakan Rancangan Acak Lengkap (RAL) dengan 4 perlakuan dan 3 ulangan yaitu perlakuan kontrol pakan tanpa probiotik boster aquaenzyms dan diinjeksi bakteri, Perlakuan A pakan dengan probiotik boster aquaenzyms 2 gram/kg pakan setiap hari dan diinjeksi bakteri, Perlakuan B pakan dengan boster aquaenzyms 6 gram/ kg pakan setiap hari dan diinjeksi bakteri, Perlakuan C dengan probiotik boster aquaenzyms 10 gram/kg pakan setiap hari dan uji tantang bakteri Vibrio alginolyticus. Parameter yang diamati selama penelitian yaitu, Sel darah merah (eritrosit), sel darah putih (leukosit), diferensial leukosit, tingkat kelangsungan hidup, dan parameter kualitas air. Analisis data menggunakan menggunakan Microrosoft Excel dan data dianalisis dengan menggunakan analisis sidik ragam (ANOVA). Analisis statistik dilakukan dengan menggunakan perangkat lunak SPSS. Apabila data berbeda signifikan (P<0,05), maka dilakukan uji lanjut Duncan. Hasil penelitian dari penambahan probiotik boster aquaenzyms dalam pakan pellet tertinggi terdapat pada perlakuan A dengan dosis 2 gram/kg pakan pada sel darah merah dan sel darah putih. Untuk diferensial leukosit yang didapat selama penelitian yaitu limfosit dan monosit. Limfosit tertinggi terdapat pada perlakuan B, dan monosit tertinggi terdapat pada perlakuan K. Tingkat kelangsungan hidup tertinggi terdapat pada perlakuan A
Efektivitas Pupuk Anorganik Yang Berbeda Untuk Substtusi Urea Sebagai Sumber Nitrogen Pada Nutrien Kultur Nannochloropsis sp.
No full textNitrogen is one of the nutrients needed by Nannochloropsis sp., but there has been no determination of fertilizer dosage based on fertilizer nitrogen sources. This study aims to determine the provision of inorganic fertilizers capable of substituting urea in the culture nutrients of Nannochloropsis sp. and to find out inorganic fertilizers that are effective for use as a nitrogen source for the Nannochloropsis sp. cell population. This study used a Completely Randomized Design (CRD) with 1 control and 3 treatments, namely: Control (Urea 50 mg / L Urea, Za, TSP, EDTA), treatment A (NPK Fertilizer 16 16 16, Za, TSP, EDTA), treatment B (Calcium Nitrate Fertilizer, ZA, TSP, EDTA), treatment C (Calcium Ammonium Nitrate Fertilizer, ZA, TSP, EDTA), each with 3 replications. The parameters observed included daily density, peak population, doubling time, water quality and light intensity. The results showed that during 7 days of maintenance, the highest daily density of Nannochloropsis sp. cells was found on D-5 of maintenance with the highest growth in treatment C (Calcium Ammonium Nitrate Fertilizer) which was 18,528,611 cells/ml with the fastest doubling time in treatment C (Calcium Ammonium Nitrate Fertilizer) which was 37.04 cells/hour and the lowest growth in treatment A (NPK 16 16 16 Fertilizer) which was 17,128,611 cells/ml with the longest doubling time in the control (Urea Fertilizer) which was 46.6 cells/hour. The peak population for the control and all treatments was found on D-5 of maintenance. The light intensity during the study ranged from 6,357 lux. These results indicate that NPK 16 16 16, Calcium Nitrate and Calcium Ammonium Nitrate fertilizers are able to substitute urea as a nitrogen source in the nutrient culture of Nannochloropsis sp. and the three organic fertilizers are effective in being used as a nitrogen source for the Nannochloropsis sp. cell population.
Nitrogen adalah salah satu unsur hara yang dibutuhkan Nannochloropsis sp., namun belum ada penentuan dosis pupuk berdasarkan sumber nitrogen pupuk. Penelitian ini bertujuan untuk mengetahui pemberian pupuk anorganik mampu menjadi substitusi urea pada nutrien kultur Nannochloropsis sp. dan mengetahui pupuk anorganik yang efektif digunakan sebagai sumber nitrogen untuk populasi sel Nannochloropsis sp.. Penelitian ini dilaksanakan pada bulan April – Mei 2025 di Balai Perikanan Budidaya Laut Batam. Penelitian ini menggunakan Rancangan Acak Lengkap (RAL) dengan 1 kontrol dan 3 perlakuan yaitu: Kontrol (Urea 50 mg/L Urea, Za, TSP, EDTA), perlakuan A (Pupuk NPK 16 16 16, Za, TSP, EDTA), perlakuan B (Pupuk Kalsium Nitrat, ZA, TSP, EDTA), perlakuan C (Pupuk Calcium Ammonium Nitrate, ZA, TSP, EDTA), masing – masing 3 ulangan. Parameter yang diamati meliputi kepadatan harian, puncak populasi, doubling time, kualitas air dan intensitas cahaya. Hasil menunjukkan selama 7 hari pemeliharaan kepadatan harian sel Nannochloropsis sp. tertinggi terdapat pada H-5 pemeliharaan dengan pertumbuhan tertinggi pada perlakuan C (Pupuk Calcium Ammonium Nitrate) yaitu 18.528.611 sel/ml dengan doubling time tercepat pada perlakuan C (Pupuk Calcium Ammoinum Nitrate) yaitu 37,04 sel/jam dan pertumbuhan terendah pada perlakuan A (Pupuk NPK 16 16 16) yaitu 17.128.611 sel/ml dengan doubling time terlama pada kontrol (Pupuk Urea) yaitu 46,6 sel/jam. Puncak populasi untuk kontrol dan semua perlakuan terdapat pada H-5 pemeliharaan. Intensitas cahaya selama penelitian berkisar 6.357 lux. Hasil ini menunjukkan bahwa pupuk pupuk NPK 16 16 16, Kalsium Nitrat dan Calcium Ammonium Nitrate mampu menjadi substitusi urea sebagai sumber nitrogen pada nutrien kultur Nannochloropsis sp. dan ketiga pupuk organik efektif menjadi digunakan sebagai sumber nitrogen untuk populasi sel Nannochloropsis sp.
Designing a Collaborative Compliance Framework for Motor Vehicle and Heavy Equipment Tax Validation in a Gated Industrial Zone: Lessons from Bintan Inti Industrial Estate
No full textThe objective of the research is to explain how collaborative tax validation can be structured as a repeatable and auditable mechanism in an industrial-estate environment and to formulate an implementable framework for optimizing local revenue realization. The study employs a qualitative secondary-data design using document-based evidence, including relevant laws and implementing regulations, administrative procedures and SOPs, institutional reports, and publicly accessible industrial-estate documents. Data were analyzed through qualitative content analysis with iterative coding to identify recurring themes and bottlenecks in the validation process, followed by synthesis into a phased implementation model and governance requirements. The results indicate that the main leakage risk is driven less by outright non-payment and more by systematic mismatches between administrative registries and operational reality, compounded by weak evidence standards for confirming asset presence and use inside the estate. Effective collaboration is shown to depend on explicit data governance arrangements purpose limitation, stewardship roles, standardization protocols, audit trails, and dispute-resolution pathways rather than purely technical integration. The study also finds that a phased approach is most feasible: (1) standardizing identifiers and taxable-object categories; (2) piloting data-sharing governance and a minimum viable dataset; (3) implementing a validation workflow with clear exception handling; and (4) scaling through performance metrics and integrity controls. In conclusion, collaborative validation can be strengthened when designed as routine compliance infrastructure that reduces ambiguity, clarifies institutional roles, and produces verifiable evidence for liability confirmation, thereby improving the sustainability and predictability of local revenue collection in industrial regions
Kemampuan Berpikir Kritis Siswa SMP dalam Menyelesaikan Masalah Geometri
No full textThis study aims to describe the critical thinking skills of junior high school (SMP) students in solving geometry problems. A descriptive qualitative approach was used, involving six eighth-grade students selected through purposive sampling. The subjects consisted of two students from each category of mathematical ability: high ( & ), medium ( & ), and low ( & ). The six students were selected based on their performance in the written test and their verbal communication skills, as observed during the pre-research phase, to ensure a more accurate representation of the population. Data were collected through written tests consisting of two essay questions and semi-structured interview guidelines developed based on Facione’s critical thinking indicators: interpretation, analysis, evaluation, and inference. The research data collected were written test results and interviews, which were then analyzed based on critical thinking indicators. The results showed that interpretation was the indicator most easily achieved by all subjects, analysis was optimally achieved only by students with high mathematical ability, while evaluation and inference were the most difficult indicators to fulfill. The study concludes that students’ critical thinking skills in solving geometry problems are generally low, primarily because of insufficient mastery of the underlying material.Penelitian ini bertujuan untuk mendeskripsikan kemampuan berpikir kritis siswa Sekolah Menengah Pertama (SMP) dalam menyelesaikan masalah geometri. Pendekatan yang digunakan adalah kualitatif deskriptif dengan subjek enam siswa kelas VIII yang dipilih secara purposive sampling, terdiri dari dua siswa pada masing-masing kategori kemampuan matematis tinggi (T1 & T2), sedang (S1 & S2), dan rendah (R1 & R2). Instrumen pengumpulan data dilakukan dengan tes tertulis dan pedoman wawancara yang disusun berdasarkan indikator berpikir kritis menurut Facione, yaitu interpretasi, analisis, evaluasi, dan inferensi. Hasil penelitian menunjukkan bahwa interpretasi merupakan indikator yang paling mudah dicapai oleh seluruh subjek, analisis hanya dicapai secara optimal oleh siswa berkemampuan tinggi, sedangkan evaluasi dan inferensi menjadi indikator yang paling sulit dipenuhi. Dapat disimpulkan bahwa kemampuan berpikir kritis siswa dalam menyelesaikan masalah geometri masih tergolong rendah hal itu disebabkan oleh kurangnya penguasaan konsep materi
EKSTRAKSI ALBUMIN IKAN TOMAN (Channa micropeltes) DENGAN METODE BERBEDA
Full text linkIkan toman dikenal dengan sebutan Giant snakehead, memiliki kandungan nutrisi yang sangat baik untuk kesehatan terutama kandungan protein tinggi yaitu albumin dan asam amino esensial dan non esensial. Salah satu faktor yang dapat mempengaruhi hasil ekstraksi albumin adalah suhu pada saat ekstraksi dilakukan. Sejauh ini belum ditemukan perbedaan kadar albumin dengan metode ekstrak berbeda. Oleh sebab itu dilakukan penelitian tentang pengaruh metode berbeda segar dan perebusan terhadap ekstrak albumin ikan toman (Channa micropeltes). Penelitian ini bertujuan untuk mendapatkan perbedaaan karakteristik ekstrak albumin ikan toman (Channa micropeltes) dengan metode yang berbeda segar dan perebusan. Metode yang digunakan adalah eksperimen dengan uji statistik T. Hasil pada penelitian ini nilai protein ekstrak daging ikan toman dengan metode segar dan perebusan dengan nilai 23,507% dan 18,892%. Uji T kadar protein menunjukkan ekstrak daging ikan toman dengan metode perebusan memiliki kandungan protein lebih rendah dibandingkan dengan metode segar (P˂0,05). Kadar albumin ekstrak daging ikan toman dengan metode segar dan perebusan berturut-turut 7,736% dan 6,821%. Uji T pada kadar albumin menunjukkan ekstrak daging ikan toman dengan metode segar memiliki kadar albumin yang lebih tinggi dibandingkan ekstrak daging ikan toman dengan metode perebusan (P˂0,05). kadar asam amino ekstrak daging ikan toman dengan metode segar dan perebusan berturut-turut 14,656% dan 13,100%. Berdasarkan hasil penelitian menunjukkan penggunaan metode berbeda pada ekstrak daging ikan toman memiliki kerakteristik berbeda nyata terhadap kadar albumin, kadar protein, dan asam amino.Ikan toman dikenal dengan sebutan Giant snakehead, memiliki kandungan nutrisi yang sangat baik untuk kesehatan terutama kandungan protein tinggi yaitu albumin dan asam amino esensial dan non esensial. Salah satu faktor yang dapat mempengaruhi hasil ekstraksi albumin adalah suhu pada saat ekstraksi dilakukan. Sejauh ini belum ditemukan perbedaan kadar albumin dengan metode ekstrak berbeda. Oleh sebab itu dilakukan penelitian tentang pengaruh metode berbeda segar dan perebusan terhadap ekstrak albumin ikan toman (Channa micropeltes). Penelitian ini bertujuan untuk mendapatkan perbedaaan karakteristik ekstrak albumin ikan toman (Channa micropeltes) dengan metode yang berbeda segar dan perebusan. Metode yang digunakan adalah eksperimen dengan uji statistik T. Hasil pada penelitian ini nilai protein ekstrak daging ikan toman dengan metode segar dan perebusan dengan nilai 23,507% dan 18,892%. Uji T kadar protein menunjukkan ekstrak daging ikan toman dengan metode perebusan memiliki kandungan protein lebih rendah dibandingkan dengan metode segar (P˂0,05). Kadar albumin ekstrak daging ikan toman dengan metode segar dan perebusan berturut-turut 7,736% dan 6,821%. Uji T pada kadar albumin menunjukkan ekstrak daging ikan toman dengan metode segar memiliki kadar albumin yang lebih tinggi dibandingkan ekstrak daging ikan toman dengan metode perebusan (P˂0,05). kadar asam amino ekstrak daging ikan toman dengan metode segar dan perebusan berturut-turut 14,656% dan 13,100%. Berdasarkan hasil penelitian menunjukkan penggunaan metode berbeda pada ekstrak daging ikan toman memiliki kerakteristik berbeda nyata terhadap kadar albumin, kadar protein, dan asam amino
From Waste to Wealth: Community Service for Sustainable Furniture Production
Full text linkThe PKM activity was carried out in Dalung, Badung, Bali. It adopts the use of reclaimed wood in furniture production. The background of this activity is that UMKM (Micro, Small, and Medium Enterprises) face an obstacle in their efforts to manage the cost of production and increase product quality. High dependence on new wood raises production costs, and as a result, it confines profitability. The program was designed to enhance the operational skills of UMKM operators to process reclaimed wood efficiently for lower cost production and high-quality final products.Participatory approaches were applied, followed by technical training sessions and direct production assistance. The beneficiary activities included identification of problems within a specific context, practical training in techniques for processing reclaimed wood, and managerial skills that aim to improve efficiency in resource use. The activities involved three main stages: socialization and problem identification, technical training, and tutoring during the course of production.The results were fairly impressive: the reduction of production costs by 25-30% due to the use of reclaimed wood, improvement of technical skills of participants, and enhanced product quality to meet local consumer standards. The program promoted active involvement in the community as well, because the participants expressed great interest in the application of the techniques learned. The overall outcomes of PKM helped not only to empower local UMKM but also to train people in sustainable practices within the production of furniture. Therefore, it placed an emphasis on the use of local resources and on continuous training as a stimulus for grass-roots economic growth
Membangun Kesadaran Lingkungan Melalui Budaya Organisasi Hijau Di Sekolah Adiwiyata SDS Toan Hwa Tanjungpinang
Full text linkThe purpose of this research is to build environmental awareness through green organizational culture at sds toan hwa tanjungpinang school. The method used in this research is descriptive qualitative using data collection techniques through interviews, observation and documentation. Then the data analysis techniques used are data reduction, data presentation and conclusions. The results of this study indicate that SDS Toan Hwa Tanjungpinang has implemented a green organizational culture quite well The implementation of this green organizational culture is carried out through various programs and activities, such as: physically and mentally healthy includes the physical and mental health, of classroom students without using air conditioning to maintain air circulation, facilities that meet health standards including toilets and classrooms, routine sports activities every Wednesday morning, collaborating with health centers for health screening including dental examinations and immunizations, urging parents to provide healthy lunches for children without using disposable packaging such as sterofoam. This research is intended to find out that green organizational culture is an effective strategy to build environmental awareness in schools. The implementation of green organizational culture can increase students\u27 awareness of the environment and encourage them to behave in an environmentally friendly mannerTujuan dari penelitian ini untuk membangun kesadaran lingkungan melalui budaya organisasi hijau pada sekolah SDS Toan Hwa Tanjungpinang. Metode yang digunakan dalam penelitian ini adalah deskriptif kualitatif dengan menggunakan teknik pengumpulan data melalui wawancara, observasi dan dokumentasi. Kemudian teknik analisis data yang digunakan yaitu reduksi data, penyajian data dan kesimpulan. Hasil pada penelitian ini menunjukkan bahwa SDS Toan Hwa Tanjungpinang telah menerapkan budaya organisasi hijau dengan cukup baik. Implementasi budaya organisasi hijau ini dilakukan melalui berbagai program dan kegiatan, seperti: sehat secara fisik dan mental mencakup kesehatan lahir dan batin siswa, kelas tanpa menggunakan AC untuk menjaga sirkulasi udara, fasilitas yang memenuhi standar kesehatan termasuk toilet dan ruang kelas, kegiatan olahraga rutin setiap Rabu pagi, melakukan kerjasama dengan puskesmas untuk skrining kesehatan termasuk pemeriksaan gigi dan imunisasi, menghimbau orangtua untuk menyediakan bekal sehat untuk anak tanpa menggunakan kemasan sekali pakai seperti sterofoam. Penelitian ini dimaksudkan untuk mengetahui bahwa budaya organisasi hijau merupakan strategi yang efektif untuk membangun kesadaran lingkungan di sekolah. Implementasi budaya organisasi hijau dapat meningkatkan kepedulian siswa terhadap lingkungan dan mendorong mereka untuk berperilaku ramah lingkunga
Investigation of Electrical Voltage Influence on Thermoelectric Cooler (TEC) Performance in a Stacked Cooling Enclosure
Full text linkThe Thermoelectric Cooler (TEC) is an environmentally friendly solid-state cooling technology with wide application potential. This study aims to analyze the effect of voltage variation on the thermal performance of a TEC-based cooling system applied to a prototype cooling box. The methodology involved designing a system with eight symmetrically installed TEC units, tested at five voltage levels: 16 V, 18 V, 20 V, 22 V, and 24 V. Evaluated parameters included cold and hot side temperatures, heat absorbed (Qc), and Coefficient of Performance (COP). Experimental results revealed that increasing voltage up to 22 V significantly enhanced system efficiency, with the highest COP of 0.25 and maximum Qc of 5.24 W. However, at 24 V, performance declined due to excessive heat accumulation on the hot side of the TEC, exceeding heat dissipation capacity. In conclusion, an optimal input voltage of 22 V was identified to yield the most efficient cooling performance. These findings support the applicability of TEC technology for compact and sustainable cooling systems
Building Confidence: Reducing Speaking Anxiety Among Blitar\u27s EFL Students in the Post-Covid-19 era
Full text linkThe COVID-19 pandemic necessitates a shift to online learning, which often results in more passive experiences for Students who majoring in sociology in Blitar. Despite the challenges of acquiring proficiency in a foreign language like English, many third-year students remain determined to improve their speaking skills and communication abilities to support their careers. The study aimed to understand the strategies students employed to overcome speaking anxiety in social interaction. Through semi-structured interviews and classroom observations, the research identified three primary approaches: collecting, grouping, and summarizing. The twelve Sociology students emphasized the importance of preparation in speaking, including studying and practicing pronunciation. A significant majority (84%) of students believed in the power of preparation, while 24% relied on relaxation techniques to manage anxiety. A smaller group (12%) exhibited minimal participation in speaking, reflecting a state of resignation. Engaging in small talk was identified as a potential strategy to address the challenges faced by students experiencing speaking anxiety in the classroom
UTILIZATION OF CHITOSAN IN BIOSORPTION TECHNOLOGY: A REVIEW OF ADSORPTION CAPACITY AND ITS APPLICATIONS FOR HEAVY METALS
Full text linkThe rising levels of heavy metal pollution in water bodies present major environmental and public health issues. Conventional methods for remediation often come with high costs and produce secondary waste, which can pose additional environmental risks. As an alternative, chitosan—a natural, biopolymer derived from chitin—has gained attention as a promising biosorbent for heavy metal removal. Its advantages include biocompatibility, biodegradability, and a strong ability to bind metal ions effectively. This review explores chitosan’s capacity to adsorb various heavy metals and examines its practical applications in biosorption technology. Key factors that impact its adsorption efficiency, such as solution pH, metal concentration, and contact time, are discussed. Additionally, structural modifications to enhance chitosan’s performance, including cross-linking and nanoparticle incorporation, are analyzed to highlight improvements in adsorption efficiency. By assessing these elements, this review aims to offer a comprehensive perspective on the role of chitosan in environmental management, particularly for treating heavy metal contamination in wastewater. The findings underscore chitosan\u27s potential as a sustainable solution in pollution control, emphasizing its advantages over traditional methods and its capacity to contribute to cleaner water resources