Blue - A Language for Teaching Object-Oriented Programming

Teaching object-oriented programming has clearly become an important part of computer science education. We agree with many others that the best place to teach it is in the CS1 introductory course. Many problems with this have been reported in the literature. These mainly result from inadequate languages and environments. Blue is a new language and integrated programming environment, currently under development explicitly for object-oriented teaching. We expect clear advantages from the use of Blue for first year teaching compared to using other available languages. This paper describes the design principles on which the language was based and the most important aspects of the language itself

Introductory programming: a systematic literature review

As computing becomes a mainstream discipline embedded in the school curriculum and acts as an enabler for an increasing range of academic disciplines in higher education, the literature on introductory programming is growing. Although there have been several reviews that focus on specific aspects of introductory programming, there has been no broad overview of the literature exploring recent trends across the breadth of introductory programming. This paper is the report of an ITiCSE working group that conducted a systematic review in order to gain an overview of the introductory programming literature. Partitioning the literature into papers addressing the student, teaching, the curriculum, and assessment, we explore trends, highlight advances in knowledge over the past 15 years, and indicate possible directions for future research

A search for diffuse bands in the circumstellar envelopes of post-AGB stars

In this work we present the results of a systematic search for diffuse bands (DBs, hereafter) in the circumstellar envelopes of a carefully selected sample of post-AGB stars. We concentrated on the analysis of 9 of the DBs most commonly found in the interstellar medium. The strength of these features is determined using high resolution optical spectroscopy and the results obtained are compared with literature data on field stars affected only by interstellar reddening. Based on the weak features observed in the subsample of post-AGB stars dominated by circumstellar reddening we conclude that the carrier(s) of these DBs must not be present in the circumstellar environment of these sources, or at least not under the excitation conditions in which DBs are formed. The conclusion is applicable to all the post-AGB stars studied, irrespective of the dominant chemistry or the spectral type of the star considered. A detailed radial velocity analysis of the features observed in individual sources confirms this result, as the Doppler shifts measured are found to be consistent with an interstellar origin.Comment: Accepted for A&

PENGARUH PENAMBAHAN BIOADITIF MINYAK KAYU PUTIH PADA BAHAN BAKAR PERTALITE TERHADAP PERFORMA, KONSUMSI BAHAN BAKAR DAN EMISI GAS BUANG SEPEDA MOTOR HONDA CS1 150 PGM-FI

Semakin menipisnya cadangan minyak bumi saat ini dan diperkirakan habis 15-20 tahun lagi, membuat kelangkaan bahan bakar minyak akan sulit dihindari. Ide-ide mengenai bahan bakar alternatif pun mulai dipikirkan, baik pengembangan bahan bakar baru pengganti bahan bakar maupun penambahan bahan–bahan tertentu pada bahan bakar minyak. Dari penelitian sebelumnya belum didapat hasil yang optimal terhadap kinerja mesin diperlukan penelitian lebih lanjut tentang pengaruh variasi 0%, 7% dan 8% bioaditif. Tujuan dari penelitian ini adalah untuk mengetahui pengaruh variasi penambahan jumlah bioaditif terhadap performa mesin konsumsi bahan bakar dan emisi gas buang sepeda motor. Objek penelitian ini adalah Honda CS1 150 PGM-FI dengan variasi penambahan bioaditif 0%, 7%, dan 8%. Penelitian ini menggunakan metode eksperimen dengan pengambilan data menggunakan alat adalah tachometer, chassis dynamometer, exhaust gas analyzer, dan fuel meter. Data Hasil penelitian dianalisis secara deskriptif dan dihitung secara teoritis dimasukkan dalam tabel dan grafik. Hasil pengujian menunjukkan bahwa penambahan bioaditif minyak kayu putih pada sepeda motor Honda CS1 150 PGM-FI dapat meningkatkan torsi rata-rata sebesar 2,22%, meningkatkan daya rata-rata sebesar 2,53% dengan variasi bioaditif 8%. Kemampuan mereduksi emisi gas buang CO rata-rata sebesar 34,15%, emisi gas buang HC rata-rata sebesar 14,59% dengan variasi bioaditif 8%. Selanjutnya dapat menurunkan konsumsi bahan bakar rata-rata sebesar 35,78% pada variasi bioaditif 8%. Dari hasil tersebut menunjukan bahwa semakin banyak penambahan bioaditif kedalam bahan bakar pertalite akan menghasilkan kinerja mesin yang baik dan efisien. Kata kunci: Bioaditif, emisi gas buang, konsumsi bahan bakar, performa mesi

Analisis Pengaruh Coffee Shop terhadap Kepuasan Pelanggan dengan Menggunakan Metode Structural Equation Model

Beberapa tahun terakhir pelaku usaha harus lebih ekstra untuk memaksimalkan usahanya di karenakan banyaknya pesaing dibidang yang sama, salah satunya adalah para pelaku usaha coffee shop. Pemasaran dan kolaborasi perlu dilakukan untuk meningkatkan pendapatan. Kepuasan konsumen menjadi fokus utama untuk meningkatkan kepuasan pelanggan. Penelitian ini bertujuan untuk meningkatkan kepuasan pelanggan dengan menghubungkan variabel-variabel yang berpengaruh pada kualitas produk, harga, kualitas pelayanan terhadap kepuasan konsumen pada Coffee Shop. Metode yang digunakan yaitu metode Structural Equation Model. Tahap yang dilakukan dalam pengolahan data adalah pertama membentuk hubungan antar variabel dan indikator, kedua confimatory analysis untuk variabel eksogen dan endogen dan terakhir uji estimasi mode lengkap. Berdasarkan hasil dan pembahasan pada penelitian ini adalah uji kecocokan model yang dilakukan menggunakan beberapa kriteria seperti ChiSquare, GFI, AGFI dan RMSEA. Nilai ChiSquare (34,518), nilai GFI dan AGFI diatas 0,9 dan RMSEA dibawah 0,08. Tidak Semua variabel antecedents memiliki pengaruh yang signifikan dan variabel antecedentst tidak bisa menjelaskan variabel konsequents karena nilai R2 ? 0,5. Kesimpulan dari hipotesa penelitian ini merupakan produck_Quality berpengaruh terhadap Custome_ Satisfaction, Price berpengaruh terhadap Customer_Satisfaction, Service_Quality tidak berpengaruh terhadap Customer_Satisfaction dan Price berpengaruh terhadap Product_Quality

Isolation and Antagonism of Bacteria Test of Biota in the Mangrove Ecosystem Kayu Ara River Siak Regency

The General area is the mangrove biodiversity and marine life that have biological activity that likely has the same pharmacological potential as an antimicrobial compound. The purpose of this research is to know the bacterial antagonism in isolation from mangrove, mangrove crabs, snails and fish tembakul against pathogenic bacteria (Aeromonas hydrophila, Aeromonas salmonicida, Edwardsiella ictaluri). This research dimula from May – June 2019. From the results of research that has been done shows that isolates that have the capability of antagonism against pathogenic bacteria test three (A. salmonicida, A. hydrophila and E. ictaluri) were isolate CS7 with category stronger, isolate CS6, CS5, CS4, AI4, AI5, CS9 AI2, with weak category, whereas isolates CS1, B22, B33, B44, AI6 AI7 AI8, was only able to inhibit pathogenic test of 2 with a weak category. The results of the DNA analysis of the 16S rRNA sequence with the use and analysis of BLAST obtained that isolates the Bacillus cereus species are included

On existence and uniqueness of the carrying simplex for competitive dynamical systems

Certain dynamical models of competition have a unique invariant hypersurface to whichevery nonzero tractory is asymptotic, having simple geometry and topology.Comment: Submitted to Journal of Biological Dynamics. 13 page