Judul: Utilization of Pineapple Waste (Ananas Comosus) as a Field Grass Substitute in Complete Rations Wafer
Abstrak: Dibeberapa sentra produksi nanas, limbah nanas belum banyak dimanfaatkan padahal ketersediaan dan kandungan nutriennya cukup baik. Penelitian ini bertujuan mendapatkan taraf terbaik penggunaan limbah nanas (Ananas Comosus) sebagai substitusi rumput lapang pada pembuatan wafer ransum komplit. Rancangan percobaan dalam penelitian ini adalah Rancangan Acak Lengkap (RAL) dengan 3 perlakuan dan 4 ulangan yaitu P0: tanpa limbah nanas (kontrol), P1: substitusi rumput lapang dengan limbah nanas 50%, P2: substitusi rumput lapang dengan limbah nanas 100%. Peubah yang diamati adalah kualitas fisik, komposisi kimia dan daya terima domba terhadap wafer ransum komplit. Data uji fisik dianalisis menggunakan analysis of variance (ANOVA), sedangkan komposisi kimia dan daya terima menggunakan analisis deskriptif. Penggunaan limbah nanas sebagai sumber serat dapat menggantikan rumput lapang sampai dengan taraf 50% pada wafer ransum komplit berdasarkan uji kualitas fisik (aktivitas air, kadar air, berat jenis dan wafer durability index), komposisi kimia dan daya terima. Kata kunci: akseptabilitas, hijauan, kualitas fisik, limbah nanas, wafer ransum komplit, Inseveral pineapple production centers, pineapple waste is not widely used although its availability and nutrient content are quite good. This study was aimed to analyze the best level of pineapple waste (Ananas Comosus) to substitute field grass fiber in complete rations wafer. The experimental design in this study was a Completely Randomized Design (CRD) with 3 treatments and 4 replications, namely P0: without pineapple waste (control), P1: field grass substitution by 50% of pineapple waste, P2: field grass substitution by 100% of pineapple waste. The observed variables were physical quality, chemical composition and acceptability of sheep to complete rations wafer. Physical test data were analyzed using analysis of variance (ANOVA), while chemical composition and acceptability by descriptife analysis. The use of pineapple waste as a source of fiber can replace field grass up to 50% in complete wafer rations based on physical quality tests (water activity, moisture content, density and wafer durability index), chemical composition and acceptability. Keywords: acceptability, forage, physical quality, pineapple waste, complete rations wafer
Keyword: acceptability, forage, physical quality, pineapple waste, complete rations wafer

Judul: Potential Utilization of Hydrolyzed Pineapple Waste Solution as Bioherbicide in Pineapple Plant Cultivation at PT. Great Giant Pineapple, Lampung
Abstrak: Nanas merupakan buah yang cukup diminati masyarakat Indonesia. Tingkat budidaya nanas di Indonesia sudah cukup tinggi. Nanas kebanyakan hanya diambil buahnya sehingga menyisakan limbah berupa kulit dan bonggol dalam jumlah yang cukup besar apabila tidak diolah dan dimanfaatkan secara bijak. Hambatan yang cukup beragam juga membuat produksi nanas menurun. Salah satu hambatan dari budidaya nanas adalah gulma. Gulma mampu menyerap nutrisi yang diberikan ke nanas sehingga mengganggu produktivitas dari tanaman nanas. Bioherbisida dari olahan limbah nanas menjadi salah satu alternatif dalam mengendalikan gulma di budidaya nanas dengan mengusung konsep perusahaan dapat menghemat biaya untuk pembelian herbisida sintetik dan mensubtitusikan dosisnya dengan bioherbisida dari limbah produksi perusahaan. Penelitian ini dilakukan dengan tujuan menguji potensi dari limbah nanas menjadi subtitusi herbisida sintetik yang digunakan oleh perusahaan. Percobaan dilakukan sebanyak 2 kali berupa tahap screening dan aplikasi lahan. Metode yang dilaksanakan adalah dengan mencampurkan herbisida sintetik (Diuron 80WP dan Ametryn 80WP) sebagai herbisida standar perusahaan dengan bioherbisida (Hidrolisat 300 dan Hidrolisat 250) buatan IPB serta asap cair dari limbah nanas yang diolah oleh perusahaan. Hasil pengamatan menunjukan bahwa subtitusi herbisida sintetik dapat menekan pertumbuhan gulma pada fase pre-emergence dan memberikan toksisitas tinggi pada beberapa jenis gulma pada fase early post-emergence, namun pada aplikasi lahan tidak terlalu terlihat dampak herbisida terhadap penekanan gulma maupun toksisitasnya terhadap tanaman nanas. Kata kunci : bioherbisida, gulma, herbisida sintetik, hemat biaya, Pineapple is a fruit that is quite popular in Indonesia. The level of pineapple cultivation in Indonesia is quite high. Most pineapples are only taken as fruit, leaving a large amount of waste in the form of skin and stump if not processed and utilized wisely. Various obstacles also cause pineapple production to decline. One of the obstacles to pineapple cultivation is weeds. Weeds are able to absorb nutrients given to pineapples, thus disrupting the productivity of pineapple plants. Bioherbicide from processed pineapple waste is one alternative in controlling weeds in pineapple cultivation by carrying out the concept that companies can save costs for the purchase of synthetic herbicides and substitute the dose with bioherbicides from company production waste.. This study was conducted with the aim of testing the potential of pineapple waste to be a substitute for synthetic herbicides used by companies. The experiment was conducted twice in the form of screening and land application stages. The method implemented was by mixing synthetic herbicides (Diuron 80WP and Ametryn 80WP) as the company's standard herbicides with bioherbicides (Hydrolysate 300 and Hydrolysate 250) made by IPB and liquid smoke from pineapple waste processed by the company. Observations showed that the substitution of synthetic herbicides can suppress weed growth in the pre-emergence phase and provide high toxicity to several types of weeds in the early post-emergence phase, but in land application the impact of herbicides on weed suppression and toxicity to pineapple plants is not very visible. Keywords: bioherbicide, weeds, synthetic herbicides, cost-effective.
Keyword: bioherbicide, weeds, synthetic herbicides, cost-effective

Judul: Penentuan Nilai Eigen dan Vektor Eigen dari Matriks Tridiagonal 2-Toeplitz dengan Pendekatan Polinomial Chebyshev
Abstrak: The eigenvalues and eigenvectors of a matrix can be determined by finding its characteristic polynomials. The characteristic polynomials of a tridiagonal 2-Toeplitz matrix is shown to be closely connected to polynomials which satisfy the Chebyshev recurrence relationship. If the order of the matrix is odd, then the eigenvalues are found explicitly in terms of the Chebyshev zeros and the eigenvectors are found in terms of the polynomials satisfying the recurrence relationship. For even ordered matrices, the situation is more complicated. The problem in these cases is that although the Chebyshev recurrence formula is still applied, its initial values are not generating Chebyshev polynomials
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