Sistem Administrasi Pembayaran S.P.P. di SD. Taruna Bangsa, Ciputat dengan Menggunakan Microsoft Visual Basic 6.0

Penulisan Penelitian ini menjelaskan mengenai sistem administrasi pembayaranS.P.P. di SD. Taruna Bangsa, Ciputat yang selama ini prosesnya dilakukansecara manual. Oleh sebab itu penulis membuat sistem administrasi pembayaranS.P.P. dengan menggunakan sistem komputerisasi dengan menggunakan bahasapemrograman Microsoft Visual Basic 6.0 dan Database dengan menggunakanMicrosoft Access. Mudah-mudahan penulisan ini menjadi alternatif bagi pihaksekolah maupun kepada karyawannya yang mengharapkan semua kegiatannyaberjalan dengan efektif, efisien dan terkoordinasi

Ultralow threshold graded-index separate-confinement heterostructure single quantum well (Al,Ga)As lasers

Broad area graded‐index separate‐confinement heterostructure single quantum well lasers grown by molecular‐beam epitaxy (MBE) with threshold current density as low as 93 A/cm^2 (520 μm long) have been fabricated. Buried lasers formed from similarly structured MBE material with liquid phase epitaxy regrowth had threshold currents at submilliampere levels when high reflectivity coatings were applied to the end facets. A cw threshold current of 0.55 mA was obtained for a laser with facet reflectivities of ∼80%, a cavity length of 120 μm, and an active region stripe width of 1 μm. These devices driven directly with logic level signals have switch‐on delays <50 ps without any current prebias. Such lasers permit fully on–off switching while at the same time obviating the need for bias monitoring and feedback control

Spectral and dynamic characteristics of buried-heterostructure single quantum well (Al,Ga)As lasers

We demonstrate that, as predicted, (Al,Ga)As single quantum well (SQW) lasers have substantially narrower spectral linewidths than bulk double-heterostructure lasers. We have observed a further major reduction (>3×) in the linewidth of these SQW lasers when the facet reflectivities are enhanced. This observation is explained theoretically on the basis of the very low losses in coated SQW lasers and the value of the spontaneous emission factor at low threshold currents. We also report on the modulation frequency response parameter of these SQW lasers

Hubungan antara Kelimpahan Hewan Makrobenthos dengan Kerapatan Lamun yang Berbeda di Pulau Panjang dan Teluk Awur Jepara

Perairan Pulau Panjang dan Teluk Awur terletak di Kabupaten Jepara yang memiliki keanekaragaman ekosistem perairan, antara lain ekosistem lamun. Kondisi dari ekosistem lamun dikedua lokasi tersebut akan mempengaruhi tingkat kerapatan dan selanjutnya akan mempengaruhi hewan makrobenthos yang hidup di dalamnya. Penelitian ini bertujuan untuk mengetahui tingkat kerapatan lamun yang berbeda dan kelimpahan hewan makrobenthos serta hubungan antara tingkat kerapatan lamun yang berbeda dengan kelimpahan hewan makrobenthos yang ada di perairan Pulau Panjang dan Teluk Awur Jepara. Pelaksanaan penelitian ini dilakukan pada bulan April 2015 di perairan pantai Pulau Panjang dan Teluk Awur Jepara. Metode yang digunakan dalam penelitian ini adalah metode studi kasus yang bersifat deskriptif. Langkah penelitian yang dilakukan yaitu sampling, identifikasi, analisis data dan evaluasi data. Hasil penelitian menunjukkan terdapat 5 jenis lamun yang ditemukan di Pulau Panjang yaitu Thalassia sp, Cymodocea sp, Enhallus sp, Halodulle sp dan Sryngodium sp dan terdapat 4 jenis lamun yang ditemukan di Teluk Awur yaitu Thalassia sp, Cymodocea sp, Enhallus sp dan Halophila sp. Kelimpahan hewan makrobenthos di kerapatan lamun jarang, sedang dan padat di Pulau Panjang adalah 68 ind/m3, 77 ind/m3 dan 103 ind/m3, sedangkan kelimpahan hewan makrobenthos di kerapatan lamun jarang, sedang dan padat di Teluk Awur adalah 43 ind/m3, 62 ind/m3 dan 84 ind/m3. Berdasarkan hasil regresi menunjukkan antara kelimpahan hewan makrobenthos dengan kerapatan lamun terdapat korelasi yang erat, sehingga semakin tinggi kerapatan lamun akan diikuti oleh tingginya kelimpahan hewan makrobenthos. Awur Bay and Panjang Island which are located in Jepara, have a diversity of ecosystems such as seagrass. Conditions of seagrass ecosystems in both location will affect the level of density macrobenthic animal who live there. The purpose of the research was to know the relationship between density level of different seagrass and abundance of macrobenthic animal both in Panjang Island and Awur Bay, Jepara. The research has been done in April 2015. The method used was case study and analyzed descriptive. Research carried out measures that take sample, identification, data analysis and data evaluation. The result showed that there were 5 type of seagrass found in Panjang Island Thalassia sp, Cymodocea sp, Enhallus sp, Halodulle sp and Sryngodium sp and there were 4 type of seagrass found in Awur Bay Thalassia sp, Cymodocea sp, Enhallus sp dan Halophila sp. The abundance of macrobenthic animal from sparse, medium and dense density of seagrass in Panjang Island was 68 ind/m3, 77 ind/m3 and 103 ind/m3. While the abundance of macrobenthic animal from sparse, medium and dense density of seagrass in Awur Bay was 43 ind/m3, 62 ind/m3 and 84 ind/m3. Based on regression result showed that between abundance of macrobenthic animal with seagrass density there were a close correlation so that the higher seagrass density will be followed by higher abundance of macrobenthic animal

Invited letter to editor in response to: Finland’s handling of selenium is a model in these times of coronavirus infections.

This response by the authors is in reply to a letter from Ulfberg and Stehlik (https://doi.org/10.1017/S0007114520003827) in comment to the authors' orginal article (https://doi.org/10.1017/S0007114520003128) that suggested that SE status was an important factor in determining the host response to viral infections