Experimental Study of Confined Low-, Medium- and High-Strength Concrete Subjected to Concentric Compression

An experimental study of 23 low-, medium- and high-strengthconcrete columns is presented in this paper. Square-confined concrete columns without longitudinal reinforcement were designed, and tested under concentric axial compression. The columns were made of concrete with a compressive strength ranging between 30 MPa and 70 MPa. The test parameters in the study are concrete compressive strengths and confining steel properties, i.e. spacing, volumetric ratios and configurations. The effects of these parameters on the strength and ductility of square-confined concrete were evaluated. Of the specimens tested in this study, the columns made with higher-strength concrete produced less strength enhancement and ductility than those with lower-strength concrete. The steel configurations were found to have an important role in governing the strength and ductility of the confined high-strength concrete. Moreover, several models of strength enhancement for confined concrete available in the literature turned out to be quite accurate in predicting the experimental results

Analysis of Mangrove Biomass in the Eco – Tourism Area of Mangrove Ecosystem in Sungaitohor Village of Riau Province

The research was conducted in December 2016-January 2017 in the mangrove ecosystem of Sungaitohor Village, Riau Province. The objective of this research was to analyze the biomass potential of mangrove ecosystem, to know the difference betwen above ground biomass potential (Above Ground Biomass, AGB) and underground biomass (Below Ground Biomass, BGB). Of the ANOVA test results on the levene test count has a value of 5.822 with a probability value of 0.009 (<0.05) then the three variants of the population are identical so that the biomass content of Station 1. Station 2 and Station 3 is not significantly different, the results showed that in the t-independent test results showed no significant differences in the potential value of AGB and BGB. Based on the ANOVA test the finding shawed no significant difference to total biomass at each station in Sungaitohor Village, Meranti Islands District

Peningkatan Aktivitas Peserta Didik Menggunakan Teknik Make a Match Dalam Pembelajaran IPA Di Sekolah Dasar

The research objective is to increase the activity of students in Natural Science Learning using techniques make a match. The method used is descriptive qualitative method, while its shape using Action Research (PTK). The location of this research in primary school. The tools used are observation sheets, test questions, and documents. The results of this study, namely, 1) the ability of teachers to plan Natural Science Learning using techniques make a match has increased with very good category. 2) The ability of teachers to implement Natural Science Learning by using techniques make a match has increased with very good category. 3) Physical activity learners an increase in both categories, 4) Mental Activity learners has increased with both categories; and 5) the learner emotional activity has increased with very good category

Gaya Kepemimpinan Kepala Perpustakaan Terhadap Motivasi Kerja Pegawai Di Perpustakaan Arsip Dan Dokumentasi Kota Kotamobagu

Di era globalisasi pesatnya kemajuan teknologi sangat penting terhadap berbagai kegiatan, salah satunya kegiatan yang dilakukan di perpustakaan. Untuk dapat bertahan, perpustakaan sebagai wahana pendidikan, penelitian, pelestarian, informasi serta rekreasi untuk meningkatkan kecerdasan sehingga perlu adanya pengembangan sumber daya manusia dalam organisasi yang merupakan pengelolah atau penggerak dalam suatu aktivitas.Pada dasarnya keberhasilan pencapaian tujuan organisasi secara intern ditentukan oleh 2 faktor utama yang mempengaruhi satu dengan yang lainnya yaitu gaya kepemimpinan yang diterapkan oleh seorang pemimpin organisasi dan para pelaksana yang meliputi keseluruhan bawahan yang ada dalam organisasi tersebut.Tujuan dalam penelitian ini adalah untuk mengetahuai bagaimana gaya kepemimpinan kepala perpustakaan terhadap motivasi kerja pegawai di kantor arsip dan dokumentasi kota kotamobagu. Metode penelitian yang digunakan dalam penelitian ini adalah metode penelitian dengan menggunakan pendekatan kualitatif, di mana penelitian yang dilakukan bersifat deskriptif. Teknik analisa yang digunakan dalam penelitian ini adalah analisa deskriptif kualitatif.Berdasarkan hasil penelitian ini dan sesuai dengan jawaban yang diberikan dari informan kepada peneliti bahawa gaya kepemimpinan kepala perpustakaan terhadap motivasi kerja pegawai sangatlah penting akan tetapi kepala perpustakaan belum maksimal karena hampir sebagian pegawai kurang termotivasi dalam melaksanakan aktifitas di perpustakaan karena gaya kepemimpinan yang diterapkan cenderung gaya kepemimpinan otoriter sehingga menjadi factor penghabat dalam pelaksanaan di perpustakaan, dan pegawai yang memiliki kemampuan dalam mengolah perpustakaan hanyalah sebagian pegawai yang punya pemahaman yang lebih

Dapatkah Kualitas Audit Mengurangi Biaya Modal Ekuitas Ex-ante?1

Tujuan dari studi ini adalah untuk menguji pengaruh kualitas audit terhadap biaya ekuitas modal ex-ante Perusahaan publik terdaftar pada Bursa Efek Indonesia. Kualitas audit diukur dengan ukuran Kantor Akuntan Publik (Big 4) dan spesialisasi industri KAP. Studi sebelumnya menemukan bahwa kualitas audit yang lebih tinggi dapat mengurangi biaya modal ekuitas ex-ante. Dengan menggunakan sampel 288 tahun Perusahaan untuk data panel Perusahaan publik terdaftar di BEI, kami menemukan bukti yang sebaliknya yaitu adanya pengaruh positif kualitas audit menggunakan proksi KAP Big 4 terhadap biaya modal ekuitas ex-ante. Sebaliknya, kami menemukan bukti adanya pengaruh negatif spesialisasi industri KAP terhadap biaya modal ekuitas ex-ante, khususnya untuk Perusahaan-Perusahaan publik terdaftar yang lebih kecil. Penjelasan alternatif untuk temuan-temuan ini adalah bahwa diduga investor tidak memandang Big 4 memiliki kualitas audit yang lebih tinggi dibandingkan dengan non-Big 4, dan investor menggunakan informasi lainnya yang lebih dapat diandalkan untuk mengurangi risiko informasi dalam pengambilan keputusan investasi mereka

Vertical flight path steering system for aircraft

Disclosed is a vertical flight path angle steering system for aircraft, utilizing a digital flight control computer which processes pilot control inputs and aircraft response parameters into suitable elevator commands and control information for display to the pilot on a cathode ray tube. The system yields desirable airplane control handling qualities and responses as well as improvements in pilot workload and safety during airplane operation in the terminal area and under windshear conditions

Aircraft flight path angle display system

A display system for use in an aircraft control wheel steering system provides the pilot with a single, quickened flight path angle display to overcome poor handling qualities due to intrinsic flight path angle response lags, while avoiding multiple information display symbology. The control law for the flight path angle control system is designed such that the aircraft's actual flight path angle response lags the pilot's commanded flight path angle by a constant time lag .tau., independent of flight conditions. The synthesized display signal is produced as a predetermined function of the aircraft's actual flight path angle, the time lag .tau. and command inputs from the pilot's column

Respon Tanaman Jagung Terhadap Pemupukan Fosfor Pada Typic Dystrudepts

On the acid soil, phosphorus nutrients become critical for agricultural crops growth. At the present, price of fertilizers significantly increase and fertilizers are not available. These conditions can affect on soil productivity and crop production. The objective of these research were to study the response of maize (Zea mays L.) to phosphate fertilizers on Inceptisol. The research was conducted in Cicadas Village on Typic Dystrudept. Experiment was conducted in a randomized completely block design, with 8 treatments and three replications. Treatments consisted of 6 dosages of P fertilizers,which were P source is SP-36 WIKA Agro 0, 10, 20, 40, 60 and 80 kg ha-1. SP-36 and Tunisia rock phosphate (40 kg P ha-1) were used for standard. Pioneer 12 variety of maized was used as an indicator. Plot size was 5 m x 6 m and the maize was planting with distance of 75 cm x 20 cm with one seed per hole. The results showed that organic C and N, P (extracted by Bray 1), K and CEC on the soil were low. Phosphate fertilizers significantly increased which was P extracted by HCl 25% from 24 to 67 mg P 100 g-1 soil and which were extracted by Bray 1 increased from 0,87 to 63.31 mg P kg-1 soil. Phosphate fertilizers significantly increased plant height from 175.2 cm become to 221.1 cm. Plant height of maize using SP-36 WIKA Agro fertilizer (210.6 cm) was similar to plant heigh using SP-36 fertilizer (213.4 cm) but less height from Tunisia rock phosphate. The yield of maize on SP-36 WIKA Agro (4.94 t ha-1) were linely higher than SP-36 (4.69 t ha-1), significantly was higher than that of Tunisia rock phosphate. Maximum dosage of SP-36 fertilizer was 66.67 kg P ha-1, and optimum dosage was 42 kg P ha-1. Value of Relative Agronomic Effectiveness SP-36 WIKA Agro fertilizer was heigher than SP-36