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Adsorpsi Ion Amonium dari Larutan Encer Menggunakan Zeolit Alam Sarulla Termodifikasi KCl
Full text linkThis study aims to evaluate the effectiveness of KCl-modified Sarulla natural zeolite in removing ammonium ions from aqueous solutions. The zeolite was modified by soaking in 0.5 M (ZA05) and 1.5 M (ZA15) KCl solutions for 24 hours at a solid/solvent ratio of 1:3 (weight/volume). The adsorption process was conducted in batch mode using an orbital shaker at a speed of 100 rpm, with contact times ranging from 0 to 210 minutes. The initial ammonium ion concentration was 100 mg/L, and the analysis was performed using a UV-visible spectrophotometer. The results showed that ZA05 and ZA15 adsorbents achieved ammonium ion removal efficiencies of 14.62% and 12.29%, respectively. Adsorption isotherm analysis using the Langmuir and Freundlich models demonstrated a good fit with the equilibrium data, with ZA15 exhibiting a higher maximum adsorption capacity than ZA05. This study confirms the potential of KCl-modified Sarulla natural zeolite as an effective adsorbent material for wastewater treatment
Penyediaan Biofilm Berbasis Pektin Kulit Buah Cempedak (Artocarpus champaden L.) Terisi Carboxymethyl Cellulose dengan Variasi Konsentrasi Gliserol Untuk Menurunkan Susut Bobot Buah Mangga
Full text linkCempedak peel contains 38.85% pectin compounds and has the potential to become biofilm raw material. The characteristics of pectin-based biofilm can be improved by the addition of a glycerol plasticizer. This study aims to determine the effect of variations in glycerol concentration (0%; 3%; 5%; 7% and 9%) on biofilm charactersitics and biofilm application on the shelf life of mango fruit. Pectin was extracted using 5% citric acid at 85°C or 90 minutes. Biofilms were applied on mango fruit for 8 days. Analysis of pectin compounds showed a yield 22.09%; ash content 7.40%; equivalent weight 588.235 mg; methoxyl content 6.20%; galacturonic acid content 36.12%. Analysis of physical properties and biofilm application on mango fruit showed a density value of 2.833 g/mL; water solubility 79.41%; mango weight loss of 33.47%; and a deacrease in vitamin C of 5%. SEM-EDX analysis showed the pectin particles were homogeneous fine grains and dominated by the element of oxygen (O) 88.84%. FTIR analysis of cempedak fruit peel pectin and biofilm showed functional groups of O-H; C-H (methyl); C=O; C-O; C-C
Semiotika Sastra: Konsep Puisi-puisi Cinta di Media Sosial Instagram
Full text linkThis research aims to describe the meaning of love-themed poems in the instagram. The study employs Charles Sanders Pierce’s semiotic theory and uses a descriptive qualitative method with a literary semiotics approach. The data source inculude posts from the @gilasastra Instagram account and interviews with its owner. The study analyzes poetic texts to identify their semiotic meanings and interpretations. The findings reveal that @gilasastra is a digital literary figure who utilizes Instagram as a platform for poetry dissemination. The love-themed poems in this account primarily represent interpersonal love, emphasizing human relationships
Ketimpangan Sosial Pada Fenomena Anak Bekerja Dibawah Umur Di Kelurahan Padang Bulan, Kota Medan, Sumatera Utara
Full text linkAbstrak
Penelitian ini bertujuan untuk melihat fenomena ketimpangan sosial yang terjadi di Perkotaan pada fenomena anak yang bekerja di bawah umur di Kelurahan Padang Bulan, Kota Medan, Sumatera Utara. Penelitian ini menggunakan pendekatan penelitian secara sosiologis dengan menggunakan teori modal Pierre Bourdieu dalam melihat fenomena anak bekerja sebagai bentuk ketimpangan sosial masyarakat di Perkotaan. Metode penelitian ini adalah penelitian kualitatif dengan pendekatan studi kasus. Hasil penelitian ini menujukkan bahwa terjadi ketimpangan sosial masyarakat di Kelurahan Padang Bulan, Kota Medan. Adanya ketimpangan ini disebabkan terjadinya kesenjangan ekonomi masyarakat kelurahan Padang Bulan ke dalam klasifikasi kelas-kelas sosial masyarakat. Masyarakat kelas atas cenderung hidup nyaman dengan segala fasilitas dan modal yang mereka miliki. Sementara itu disisi lain, masyarakat kelas bawah di Kelurahan Padang Bulan dituntut harus dapat bertahan hidup dan memenuhi kebutuhan ekonomi mereka dengan cara memperkerjakan anak-anak mereka untuk memenuhi kebutuhan hidup. Adapun pekerjaan yang dipilih anak-anak dibawah umur di Kelurahan Padang Bulan adalah pekerjaan sektor informal seperti pengumpul barang bekas, berjualan, pengemis dan berprofesi sebagai badut.
Kata Kunci: Ketimpangan Sosial, Anak dibawah umur, Kesejangan ekonomi
 
Application of Economic Production Quantity Method in Controlling the Production Level of Crude Palm Oil at PT. Perkebunan Nusantara IV Medan City
No full textPT. Perkebunan Nusantara IV is a subsidiary of an Indonesian State-Owned Enterprise engaged in oil palm and tea plantations. Crude Palm Oil as a derivative product of palm oil is one of Indonesia's mainstay export commodities. Inventory control at PT. Perkebunan Nusantara IV is a complicated matter. Therefore, one method that can be used to control raw materials is the EPQ (Economic Production Quantity) method where the EPQ method can determine the optimum production level, optimum production frequency, optimum cycle time to minimize inventory costs. By using the EPQ method, the optimum production level of Crude Palm Oil is 30,745,207,190 kg with the optimum time interval of 20 days in each production cycle and the company can save production costs of 3.94% for each production cycle
Common Property and Social Capital Governance in the Context of the Cibulao Coffee Forest Farmers Group in Tugu Utara Village, Cisarua District, Bogor Regency
Full text linkThis study aims to analyze the governance of common property and strengthening social capital in the Cibulao Coffee Forest Farmer Group (KTH) in Tugu Utara Village, Cisarua District, Bogor Regency. Using a qualitative approach with case studies, data were collected through in-depth interviews, participatory observations, and document studies. The results show that the synergy between collective ownership of forest resources and social capital based on trust, norms, and social networks creates a hybrid institution that supports sustainable forest management and community economic empowerment. However, this success is still limited to the micro scale and faces the risk of institutional exclusion if it is not integrated into the local political system in a participatory and strategic manner. David Easton's model and endogenous growth theory are used to map the challenges and opportunities for the long-term sustainability of the Cibulao Coffee KTH
The Influence of Cigarette Advertising on Teenagers' Attitudes Toward Cigarette Purchasing Decisions
Full text linkThis study aims to analyze the influence of cigarette advertising on adolescents' attitudes toward cigarette purchasing decisions and the role of the media in supporting the cigarette industry. Cigarettes have become a serious issue in global health due to their addictive substances that have a detrimental impact on health. Cigarette advertising, particularly through television and social media, is considered to greatly influence adolescents' perceptions of cigarettes as symbols of “coolness” and masculinity. This study employs a qualitative approach through Focus Group Discussions (FGD) and online media observation. The research findings indicate that most adolescents are unaware of the connection between advertising and their decision to purchase cigarettes; however, advertising still exerts an indirect influence on the formation of adolescents' opinions and attitudes. The study also found that weak government regulations and the widespread presence of cigarette advertisements exacerbate this situation. Therefore, strict oversight of advertisements and cigarette distribution, particularly those targeting teenagers, is crucial in efforts to control cigarette consumption in Indonesia
Corruption risks and potential threats to the forestry sector in Peninsular Malaysia
Full text linkCorruption and forest disturbances represent substantial barriers to sustainabledevelopment in Malaysia's forestry sector. Working within this sector faces avariety of threats. This study explores key corruption risks within the forestrysector, analysing the motives and opportunities that drive forest offences inPeninsular Malaysia. Respondents from relevant agencies were primarilysurveyed using questionnaires. Data analysis using SPSS revealed the corruptionrisks encountered within the forestry sector. Respondents identified fieldwork andreporting as potential areas susceptible to corruption, with their perceptionsanalyzed through central tendency and dispersion measures. Additionally,correlation analysis was conducted to determine the strength and direction of therelationship between motive and opportunity regarding forest offences, and toassess whether the correlation was statistically significant. The findingsdemonstrated a robust positive correlation (r = 0.66) between motive andopportunity, indicating a significant relationship. This suggests that motives forforest offences correspond to opportunities for such offences. This studyhighlights the need for targeted collaboration between the Forestry Departmentand relevant authorities to develop specialized training programs. These programsare crucial for effectively investigating and prosecuting forest violations,ultimately reducing corruption risk
Analysis of mangrove vegetation diversity in Pematang Kuala Village, Teluk Mengkudu Sub-district, Serdang Bedagai Regency, North Sumatra
Full text linkMangrove ecosystems are important in ecological, economic, and social aspects,especially for coastal communities. However, damage to mangrove ecosystemsdue to land-use changes for purposes such as settlements and fish ponds canthreaten their sustainability. This study aims to analyze the potential of themangrove ecosystem, apply the kao-kao model in silvofishery pond management,and analyze the potential of mangroves in increasing the income of the communityin Pematang Kuala Village, Teluk Mengkudu Sub-district, Serdang BedagaiDistrict, North Sumatra Province. The methods used include field surveys forvegetation analysis and interviews with Kelompok Usaha Bersama (KUB)Nelayan Sepakat members. Vegetation analysis was conducted in three zones:utilization zone I, II, and the protection zone. Each zone consisted of 5 plots,totaling 15 plots. Interviews were conducted with 27 respondents. The studyresults showed that the mangrove ecosystem in Pematang Kuala Village isdominated by Avicennia marina and Rhizophora mangle, with an important valueindex of 300 in both utilization and protection zones. In the protection zone, theShannon-Wiener diversity index was 0.95, indicating a low level of diversity.Based on the kao-kao system model, it was observed that the productivity of fishponds and fishermen's catch increased. Community income has significantlyincreased over the last five years, with an average net income of IDR 19,550,000every six months. The presence of mangroves also provides indirect benefits as acoastal protector from abrasion, with an estimated economic value of IDR247,950,000 per year
Solvent-Free Microwave Extraction: Analisis Fitokimia Minyak Atsiri Daun Ruku-Ruku (Ocimum tenuiflorum, L.) dan Aktivitas Antibakteri terhadap Escherichia coli
Full text linkHoly basil (Ocimum tenuiflorum, L.) is one of the aromatic herbs that grows in empty or abandoned areas. Previous studies used conventional methods, including maceration and hydrodistillation, to extract Ocimum tenuiflorum, L. Genetic variation, plant phenology, geographical conditions, and extraction techniques affect the yield and variability of essential oil phytochemical composition. Here in, we report essential oil extraction of Ocimum tenuiflorum green and purple using solvent-free microwave extraction. The yield calculation obtained from purple and green O. tenuiflorum essential oils was 2.25 and 2.17%, respectively. GCMS data shows that the phytochemical compounds in Ocimum tenuiflorum essential oils, purple and green leaves, are dominated by sesquiterpene and phenylpropene groups. In the essential oil of purple Ocimum tenuiflorum leaves, the major phytochemical compound components are methyl eugenol, β-Caryophyllene, and Germacrene-D. Antibacterial activity showed that Ocimum tenuiflorum purple essential oils a more preeminent effect against Escherichia coli than green