The use of information and communication technology has become a necessity for people to search for information and information published in 3-dimensional e-book media, which has been widely used in information retrieval. This paper aims to determine the use of 3-dimensional e-Books produced by the Directorate of Repository, Multimedia, and Scientific Publishing-National Information Research Agency. The method used in this research is the Google Analytics method, an application that provides information on the results of data collection (data mining) using the web using page tag techniques. With Google Analytics, the collected data related to acquisition and user behavior on the web can be analyzed to be used as a goal, reference, and reliable data. The results showed that there were 304 (three hundred and four) titles of 3-dimensional E-Books produced, which were grouped into 12 categories. Users of 3-dimensional E-Books are spread across 12 (twelve) countries. The two countries that use the most are Indonesia, with 2,718 users (94.05%), followed by America with 72 users (2.49%). Meanwhile, the two most widely used 3-dimensional e-book categories were the tourism category with 625 (31.2%) and animal husbandry and agriculture 421 (21.0%). Considering that users of this 3-dimensional e-book are scattered in various countries, it is recommended that the production of this 3-dimensional e-book can be continued.

An experimental study was conducted to investigate the effect of web opening dimension on the behavior of reinforced concrete hybrid deep T-beam subjected to pure torsion. Four reinforced concrete hybrid deep T-beams were tested under pure torsion, where the three beams with different dimension of circular web opening and the other beam without opening as a reference beam. The testing program and experimental results are presented. The results show that dimension of circular web opening with diameter more than 100 mm significantly reduces the cracking and ultimate torque. It is also shown that the angle of crack inclination with respect to the longitudinal axis of the beam increases with the increase of web opening dimension.

This paper presents an analytical study to predict the torsional behavior of reinforced concrete (RC) hybrid deep T-beam with opening and to compare to the experimental results. The RC hybrid deep T-beam was cast with normal weight concrete web and light weight concrete flanges. Based on the Softened Truss Model and Bredt's theory, a new equation was derived and proposed to show the relationship between compression strut of light weight concrete and normal weight concrete. Based on the experimental results of cracking angles and curvature equation of light weight concrete and normal weight concrete, a new equation was also proposed to show the relationship between strain diagram of light weight concrete and normal weight concrete. The analytical results show that the prediction of maximum torque capacity of the beams are close to the experimental results, except the prediction of twist angle which are larger than the experimental results.