This Journal of Innovation and Development Volume 07 Number 01 April 2019 contains eight scientific papers from various studies. Starting from technological innovations in the form of (1) physical adaptation studies on benefits and use of walking, (2) BUM Desa's fortune research in terms of economic functions and social functions that are efficient, (3) female role seekers seeking additional income from the informal sector, ( 4) study of coffee pulp extraction for oil products and various organic acids, (5) education studies to improve students' mathematical analytical skills with Bridge Analogy method, (6) study of adding magnesium and iron to micro algae cultures to increase population and lipid production , (7) descriptive study on Public-Private Cooperation to determine the most effective between Built-Transfer, Built-Operate-Transfer or Built-Transfer-Operate on Bandar Radin Inten II, and (8) friendly geopolymer research even when mixed with NaOH the more so that the quality of absorption, porosity and specific gravity can replace conventional cement.

For more details, Editorial presents prawacana that has been compiled as follows:

Akhmad Baiquni Muhaemin conducted a study which should be used to measure the walking ability of the local people of Bandar Lampung in Kemiling compared to data from the literature. From the sample data obtained, Muhaemin concluded that the local Kemiling community, Bandar Lampung, assumed that walking was only an activity that was not too influenced by the purpose and quality in the trip.

Ridwan Saifuddin conducted research on the benefits of BUM Desa as expected by the Government. For his research sample, Saifuddin took one BUM Desa, BUM Desa Swadesa Arta Mandiri, Desa Wonomarto, Kabupaten Lampung Utara, which was not yet clear the fiscal magnitude of its business. BUM Desa Swadesa Arta Mandiri has several business units, such as managing water tourism, trade, village markets, waste management, and financial institutions. It is expected that BUM Desa Swadesa Arta Mandiri is able to synergize economic functions and financial functions so that it is profitable. Without analysis of management personnel (board of directors) and personnel curators (board of commissioners), Saifuddin concluded that BUM Desa Swadesa Arta Mandiri had not been financially profitable or had a social role.

Susianti conducts research on empowering women in the informal sector in an effort to increase income. With a directed sampling method for families in Sleman Regency, DIY, Susianti tries to analyze the business reasons for women to work in the informal sector. In fact, Sleman Regency, DIY is a district that is not yet prosperous, surely Susianti's conclusion is the main reason and motivation that encourages women to work in the informal sector in Sleman Regency to increase family income to meet their needs.

Muhammad Hanif and Heru argued that the remaining coffee pulp from the instant coffee industry could still be used to extract the coffee oil. Heru and Hanif conducted a study by extracting coffee oil from Robusta coffee pulp using Soxhlet extractor, by varying the time and mass of instant coffee pulp. The results showed that the percentage of extracts did not differ significantly for extraction times for 6, 7 and 8 hours. Coffee pulp mass variation was carried out for extraction time 6 and 8 hours and it was observed that the mass variation of coffee pulp (15, 20, and 25 g) was generally significant for the extracts obtained, but not significant for coffee pulp mass 15 g with extraction time 6 and 8 hours.

Nia Agustina, Nanang Supriadi, Komarudin argues that improving teaching and learning skills can be improved by Bridge Analogy. Understanding of students takes place independently through mathematical reasoning. The study was conducted on a sample population of class VIII students of SMP 19. In addition, the results of the study also obtained a difference in the increase in students' mathematical reasoning abilities in terms of self-efficacy.

Anggi Pratiwi argues that the Tetraselmiss chuii micro algae which are fed with MgSO4.7H2O and FeSO4.7H2O as a source of magnesium and iron to increase lipid content. Algae were maintained in the reactor with a composition of 300 ml micro algae: 700 ml sea water with 30 ppt salinity and 2000 lux light. The results showed that the highest lipid content of 20,175% in Tetraselmis chuii microalgae was obtained by adding 6 grams of MgSO4.7H2O and on adding 36 ┬ÁM FeSO4.7H2O.

Dian Sera Fauzela, Bambang Utoyo Sutiyoso, Sasana Putra responded to the limited costs of providing infrastructure. Fauzela, Sutiyoso and Putra then examined the ability of Public Private Partnership (KPS) in the development of Radin Inten II Airport, South Lampung. Descriptive studies are carried out using the AHP (Analitycal Hierarchy Process) analysis technique which is used to analyze the best priority sequence that can be applied in the Public Private Partnership. AHP analysis directs the results to the form of Built-Transfer (BT) development rather than Built-Operate-Transfer (BOT) and Built-Transfer-Operate (BTO) because of doubts about the Government's side to be able to operate Intan II Radin Airport which is financially and management-wise satisfy customers.

Muhammad Amin, David Candra B, Kusno Isnugroho, Yusuf Hendronursito, Reni Septiana argued that cheap geopolymers could be generated as expensive conventional cement substitutes. The materials for making geopolymers are pearlite, basalt and feldspart which are given the addition of NaOH to increase the absorption and porosity values. In their research, Amin et al. concluded that the more addition of NaOH the smaller the absorption and porosity and the greater the specific gravity of geopolymers so that it increases the strength of geopolymers. Amin et al. believes that the use of geopolymers as a substitute for cement will be environmentally friendly because it is an earth mineral, although the use of NaOH as a strong base has been very limited in industrial and household use.

Published: 2019-04-01