Judul: Estimating the Existence Value of an Open Green Space and the  Impact of COVID-19 Pandemic on Visitor Preferences (Case Study: Situlembang  Park, Central Jakarta)
Abstrak: Taman Situlembang adalah ruang terbuka hijau (RTH) berupa taman pubik yang dimiliki kota Jakarta Pusat. Keberadaan Taman Situlembang dan peningkatan kualitas taman menjadi hal yang penting karena provinsi DKI Jakarta diharuskan memiliki RTH minimal 30%. Taman Situlembang memiliki banyak peran penting dari menjaga keseimbangan lingkungan hingga menyediakan fasilitas umum untuk olahraga dan edukasi bagi masyarakat. Pada masa pandemi COVID-19, RTH dapat menjadi solusi bagi masyarakat perkotaan yang membutuhkan ruang dan aktivitas pariwisata yang aman.Tujuan penelitian ini adalah: (1) menganalisis persepsi pengunjung mengenai kondisi lingkungan di Taman Situlembang, (2) menganalisis persepsi pengunjung terhadap pandemi COVID-19, (3) menganalisis dampak pandemi COVID-19 terhadap tingkat kunjungan dan preferensi kegiatan pengunjung di Taman Situlembang, (4) mengidentifikasi faktor-faktor apa saja yang memengaruhi tingkat kunjungan di Taman Situlembang, (5) mengestimasi nilai ekonomi keberadaan Taman Situlembang. Hasil analisis menunjukkan bahwa persepsi pengunjung mengenai kondisi lingkungan di Taman Situlembang termasuk dalam kategori baik dengan skor rata-rata 3.07. Persepsi pengunjung terhadap pandemi COVID-19 berada dalam kategori sangat baik dengan skor rata-rata 3.34. Tingkat kunjungan Taman Situlembang pada saat pandemi mengalami peningkatan sebesar 101,50%. Faktor yang memengaruhi tingkat kunjungan adalah biaya perjalanan. Nilai WTP rata-rata sebesar Rp 66.046,48 per membership per orang per tahun dan nilai total WTP responden adalah sebesar Rp 355.330.062 per tahun., Situlembang Park is an open green space (OGS) and public park owned by the City of Central Jakarta. The existence of Situlembang Park and the improvement of its quality are important as the Jakarta Province is required to have minimum 30% green open space. Situlembang Park plays many important roles, from maintaining the environmental balance to providing public facilities for sport and education. Ultimately in this COVID-19 Pandemic situation, OGS may become a solution for the urban communities who need safer tourism space and activities. The aims of this study are: (1) to analyze the visitor perception of the environmental conditions of Situlembang Park, (2) to analyze the visitor perception of COVID-19 Pandemic, (3) to analyze the impact of COVID-19 Pandemic to Situlembang Park visit rate and visitor preferences, (4) to identify factors that affect Situlembang Park visit rate, (5) to estimate the existence value of Situlembang Park. The result shows that the visitor perception of the Situlembang Park’s environmental condition is categorized as “good” with an average score of 3.07, while the visitor perception of COVID-19 Pandemic is categorized as “very good” with an average crore of 3.34. Number of visits increases to 101,50%. Travel cost is the significant factor that affect visit rate. The respondent’s annual average Willingness to Pay (WTP) is RP 66.046,48 per membership per person. The estimated existence value of Situlembang Park is given by estimated total annual WTP, which is RP 355.330.062.
Keyword: Contingent valuation method (CVM), COVID-19, Likert scale, Poisson regression analysis

Judul: Analysis of Economic Valuation and the Impact of COVID-19 Pandemic Towards the Visits Level of Ir. H. Djuanda Bandung Grand Forest Park
Abstrak: Perubahan iklim yang dipicu oleh pemanasan global merupakan permasalahan lingkungan yang menjadi perhatian penting dunia. Penyumbang gas karbon dioksida penyebab pemanasan global salah satunya merupakan wilayah perkotaan. Kota Bandung sebagai kota yang memiliki daya tarik kunjungan wisata lokal dan mancanegara yang tinggi berimplikasi pada menurunnya kualitas lingkungan. Salah satu upaya untuk mengatasi hal ini adalah membangun dan merevitalisasi RTH yaitu Taman Hutan Raya Ir. H Djuanda Bandung. Tingginya ancaman yang ada dan potensi pemanfaatan Tahura Bandung sebagai area ekowisata perlu dijaga dan dilestarikan oleh masyarakat maupun pemerintah. Penelitian ini bertujuan untuk 1) menganalisis persepsi pengunjung terhadap keberadaan Taman Hutan Raya Ir. H. Djuanda Bandung; 2) menganalisis persepsi pengunjung terhadap COVID-19; 3) menganalisis pengaruh pandemi COVID-19 terhadap tingkat kunjungan Taman Hutan Raya Ir. H. Djuanda Bandung; dan 4) mengestimasi besarnya nilai guna tidak langsung dan nilai keberadaan Taman Hutan Raya Ir. H. Djuanda Bandung. Metode yang digunakan adalah skala Likert, Pendekatan harga pasar, Benefit Transfer, dan Contigent Valuation Method. Selama pandemi COVID-19 pengunjung memberikan penilaian yang baik terhadap kawasan Taman Hutan Raya Ir. H. Djuanda Bandung. Pengunjung sepakat bahwa COVID-19 adalah virus berbahaya. Pandemi COVID-19 terbukti menyebabkan peningkatan tingkat kunjungan dikarenakan perubahan persepsi berwisata masyarakat. Total nilai ekonomi tidak langsung di Taman Hutan Raya Ir. H. Djuanda Bandung adalah sebesar Rp 28.232.524.275., Climate change triggered by global warming is an environmental problem that has become an important concern for the world. One of the contributors to carbon dioxide gas that causes global warming in urban areas. Bandung as a city that has attracted local and foreign tourist visits has implications on degrading the environmental quality. One of the efforts to overcome this is to build and revitalize green open space, namely Ir. H Djuanda Bandung Grand Forest Park. The high threat that exists and the potential use of Ir. H. Djuanda Bandung Grand Forest Park as an ecotourism area needs to be maintained and preserved by the community and the government. This study aims to 1) analyze visitor perceptions of the existence of Ir. H. Djuanda Bandung Grand Forest Park; 2) analyze visitors' perceptions of COVID-19; 3) analyze the effect of the COVID-19 pandemic on the level of visits to the Ir. H. Djuanda Bandung Grand Forest Park; and 4) estimate the magnitude of the indirect use value and existence value of Ir. H. Djuanda Bandung Grand Forest Park. The methods used are the Likert scale, market price approach, Benefit Transfer, and Contingent Valuation Method. During the COVID-19 pandemic, visitors gave a good assessment of the Ir. H. Djuanda Bandung Grand Forest Park. Visitors agree that COVID-19 is a dangerous virus. The COVID-19 pandemic has proven to have caused an increase in visit rates due to changes in people's perceptions of tourism. The total indirect economic value in Ir. H. Djuanda Bandung Grand Forest Park is Rp. 28,232,524,275.
Keyword: contingent valuation method, visitor perception, Likert scale

Judul: Konversi asam karboksilat rantai panjang ke amina sekunder rantai karbon ganjil
Abstrak: The aim of this study was to convert long-chain carboxylic acids, both saturated and unsaturated,to become odd carbon-chain secondary amines. The synthetic routes were taken from carboxylic acids through acyl chloride and primary amine, and then both of them were reacted to obtain amide II that finally reduced to secondary amine using NaBH4-I2 system in THF. The primary amines with one less carbon was synthesized by the method of Schmidt reaction. The acidic solution of hydrazoic acid was used as a reagent in the reaction.
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