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Purpose – The purpose of this research is to study the process conditions that give best yield and expected compositions of liquid smoke products that result during the pyrolisis process relying on predetermined variables.

Design/Methodology/Approach – Pyrolisis process running times are varied, that is, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, and 6 hourly. Condensing temperature maintained remained 25–30 °C. Products identification was applied by using gas chromotography mass spectroscopy.

Findings – Based on the research output, it was concluded that process conditions which give maximum yield were achieved when using double unit condenser (DUC) and time optional four hours, and it provides maximum volume liquid smoke product, and compositions of pyrolisis products. The process also created seven components, namely nepthalene, propanoic acid, 3,7 nanodiena, 2 metilguaiakol, 2-metoksi 4-methyl phenol, 4 ethyl-2 metoksil phenol, oxybanzene. Applying DUC during condensation phase may increase condensing force thereafter obtaining resulted products between 200% and 300% rather than using single unit condenser (SUC).

Research Limitations/Implications – This research was conducted on a fixed batch reactor made of a metal plate with a thickness of 3.0 mm. It carries 200 kg in capacity. In this phase, the moisture of candlenut shells might be kept in 10–12.5% wt. Process temperature applied ranged within 350–500 °C.

Originality/Value – In addition the study increased the theorical of understanding about pyrolisis process and Improving the production of liquid smoke from candlenut shell by pyrolisis process using the method of vapor condensation (Double unit condensor).

Indonesians are known for their unique behaviour and willingness to travel abroad for healthcare treatments. More than half of the healthcare “tourists” who travel to Malaysia come from Indonesia, followed in numbers by those in India, Japan, and China, Libya, the UK, Australia, USA, Bangladesh and the Philippines. Malaysia is also geographically located near two Indonesian main islands, i.e. North Sumatera and North Kalimantan. These reasons contribute to making Indonesia one of the most productive healthcare consumers in Malaysia. This study aims to examine these Indonesian consumers’ through the use of behavioural lenses to examine their medical tourism experiences in Malaysia, its neighbouring country.

The theory of planned behaviour is used as the basis of these analyses and hypotheses development. In total, 7 variables and 18 indicators that built both the exogenous and endogenous variables were developed from previous literature. Through a purposive sampling technique, the authors collected 200 samples of individuals where each respondent must at least have been to Malaysia once for medical treatments related to a general check-up, cardiovascular, cancer, orthopaedics, nervous systems or dental problems. A partial least squares – structural equation modelling analysis was carried out to examine both the measurement model and the structural model.

Behavioural belief positively affects the attitude of Indonesian patients and their intentions to visit Malaysia for medical treatment, i.e. attitude, subjective norms and perceived behavioural control. Results show that as individuals, Indonesians have a strong belief that undergoing medical treatment in Malaysia will be more favourable than having that same medical treatment in Indonesia. The study also shows that people who are considered important to patients, e.g. family members or relatives, significantly influence their intention to visit Malaysian medical institutions. The authors also found that patients’ resources and capabilities – e.g. financial strength, supporting infrastructures and time availability – are essential factors for Indonesian patients to choose medical tourism and to visit Malaysia as their venue for medical services.

The results of this study are consistent with the previous research, which has shown that attitude, subjective norms and perceived behavioural control positively affect visit intention. The results also suggest new interesting theoretical findings that Indonesia’s medical tourist intention to visit Malaysia is most strongly caused by subjective norms followed by individual attitudes and perceived behavioural control, all reasons that are identical to Japanese medical tourists’ visiting South Korea for similar purposes. Indeed, there are similar behavioural practices and beliefs among both Indonesian and Japanese medical tourists, despite the gap existing in these two countries’ economies.

The study proposes two managerial implications using its findings. First, this study can be a basis for the Malaysian medical tourism business to better understand Indonesian medical tourists’ behaviour when visiting their country. The study explicitly suggests that it is both collective and individual beliefs that drive Indonesian patients, who have the sufficient resources, to visit Malaysia because of better quality and affordability available there compared to Indonesian medical services. Second, this study raises a fundamental question about Indonesian stakeholders in the medical industry. In the near future, this type of medical tourism behaviour will, without a doubt, affect the Indonesian economy at large.

The contributions of this study are twofold. First, compared to previous studies that focussed specifically on the developed countries, this study focusses on Indonesian consumers’ point of view as an emerging country towards Malaysia’s medical tourism business. Second, this study provides quantifiable insights on the Indonesia-Malaysia medical tourism phenomenon, which previously has been frequently discussed, but only using a qualitative exploratory approach.

Despite the practice of credit card services by Islamic financial institutions (IFIs) is debatable, Islamic banks (IBs) have been offering this product. Both Muslim and non-Muslim customers have subscribed to the products. Thus, it is critical to analyse the strategy of IBs’ moral messages in reminding their Muslim and non-Muslim customers to repay their credit card debts. This paper aims to investigate this issue in Indonesia using data mining via machine learning.

This study examines the IBs’ customers across the 32 provinces of Indonesia regarding their moral status in credit card debt repayment. This work considers 6,979 observations of the variables that affect the moral status of the IBs’ customers in repaying their debt. The five types of data mining via machine learning (i.e. Boruta, logistic regression, Bayesian regression, random forest, XGBoost and spatial cluster) are used. Boruta, random forest and XGBoost are used to select the important features to investigate the moral aspects. Bayesian regression is used to get the odds and opportunity for the transition of each variable and spatially formed based on the information from the logistical intercepts. The best method is selected based on the highest accuracy value to deliver the information on the relationship between moral status categories in the selected 32 provinces in Indonesia.

A different variable on moral status in each province is found. The XGBoost finds an accuracy value of 93.42%, which the three provincial groups have the same information based on the importance of the variables. The strategy of IBs’ moral messages by sending the verse of al-Qur’an and al-Hadith (traditions or sayings of the Prophet Muhammad PBUH) and simple messages reminders do not impact the customers’ repaying their debts. Both Muslim and non-Muslim groups are primarily found in the non-moral group.

This study does not consider socio-economic demographics and culture. This limitation calls future works to consider such factors when conducting a similar topic.

The industry professionals can take benefit from this study to understand the Indonesian customers’ moral status in repaying credit card debt. In addition, future works may advance the recent findings by considering socio-cultural factors to investigate the moral status approach to Islamic credit warnings that is not covered by this study.

This work finds that religious text of credit card repayment reminders sent to Muslims in several provinces of Indonesia does not affect their decision to repay their debts. To some extent, this finding draws a social issue that the local IBs need to consider when implementing the strategy of credit card repayment reminders.

This study credits a novelty in the discourse of data science for Islamic finance practices. Specifically, this study pioneers an example of using data mining to investigate Islamic-moral incentives in credit card debt repayment.

Purpose – The purpose of this study is to find out the perspectives of students and English teachers on English Lingua Franca (ELF) at a tertiary level in one of the public universities in Lhokseumawe Municipality in Aceh and to find out the possibility of adopting the concept of teaching English as ELF to raise the students’ awareness of their identity as part of the ASEAN Economic community and as a means of communication among the Community.

Design/Methodology/Approach – The research employs basic interpretive study by delivering questionnaires to 40 students from different disciplines and conducting interview to 6 English teachers from targeted research university in Lhokseumawe, Aceh, Indonesia.

Findings – The study addresses that the majority of the students are aware that English is no longer possessed by an inner circle of English users and realize the use of English as means of communication in globally context. However, the students do not understand the English as ILF. Besides, they do not enable to envisage themselves as part of the global community of English users as their identity. The research also indicates that majority the interviewed English teachers do not realize the concept of teaching ELF in the university.

Research Limitations/Implications – The findings of this research may shed light for other English teachers in Aceh to improve their teaching method in order to improve students’ speaking skill and their awareness of their identity as a part of global imagined community of English users within the ASEAN Community Economic context.

Practical Implications – The solutions offered in the paper could improve the teaching method of English teachers particularly in Aceh, Indonesia.

Originality/Value – The research of students’ and teachers’ perspective of ELF in Lhokseumawe, Aceh, has not yet been published.

Purpose – The purpose of this research is to know the influence of manufacture of textiles, clothing, and leather and manufacture of paper, printing, and publishing on economic growth.

Design/Methodology/Approach – The method of research used was a causal research design in North Sumatera Province. The data used are secondary data sourced from Statistics Agency of North Sumatera Province. The method of analysis used in this research is SEM method using software Smart PLS.

Findings – The results show that manufacture of textiles, clothing, and leather and manufacture of paper, printing, and publishing influence to the economic growth.

Research Limitations/Implications – Limitations of the study included not analyzing by data pooling, and samples were restricted only to North Sumatra Province. The implication of this research is that the variables of manufacture of textiles, clothing, and leather give a significant contribution to the economic growth of North Sumatra. To this end, that need to be made some policies shoul be implemented to facilitate manufacture of textiles, clothing, and leather others invest in the district and city in North Sumatra.

Originality/Value – The originality of this study attempts to examine export indicators in certain segments where other studies do not examine them.

Purpose – The research was carried out in order to study the composition of minerals, content of total-K, total-Ca, total-Mg, and exchangeable of K, Ca, Mg in volcanish ash from Sinabung volcano eruption.

Design/Methodology/Approach – The volcanic ash material in amount of 5 kg was collected from the depth of 0–20 cm and 21–41 cm. Mineral composition was determined by using line counting method; total contents of K, Ca, and Mg were measured by HCl 1N extraction, and exchangeable of K, Ca, and Mg was measured by NH₄OAc 1N pH 7.0 extraction.

Purpose – The results depicted in volcanic ash layer at the depth of 0–20 cm found some minerals such as plagioclase (34%), hypersthene (9%), augite (3%), hornblende/amphibole (5%), and volcanic glass (1%). These minerals were also found in different amounts at a depth of 21–41 cm. Hypersthene and amphibole were higher and augite was lower at a depth of 0–20 cm than 21–41 cm. The total content of K, Ca, and Mg was found to be 2.27%, 8.12%, and 2.28%, respectively, at a depth of 0–20 cm. The exchangeable of K, Ca, and Mg was found in an amount of 1.89 me/100 g, 20.71 me/100 g, and 1.62 me/100 g, respectively. The total content of K, Ca, and Mg was not available to plants but could potentially be as a source of plant nutrient after weathering while exchangeable form can be uptaken by plant directly.

Research Limitations/Implications – Based on the composition of the minerals, total, and exchangeable of K, Ca, and Mg that the material of volcanic ash, it could potentially be used as source of fertilizers.

Originality/Value – The composition of primary minerals contained in volcanic ash and to know the amount of elements K, Ca, and Mg-associated minerals either in total or exchange.

The purpose of this paper is to determine the influence of service quality and university image on student satisfaction and student loyalty.

This study employed a set of survey instrument adapted from previous studies. The construct of the service quality consisted of 12 indicators, one of which was originally designed by the researcher, and the rest were adapted from other researchers. For the construct of university image, there were five indicators, while the rest were designed by the researcher. There were six indicators of construct student satisfaction, while the other three were designed by the researcher. Lastly, the construct student loyalty consisted of five indicators, three of which were originally designed by the researcher. All of those constructs used seven-point Likert scale scoring, which ranged from 1= strongly disagree to 7= strongly agree.

The findings of this study are as follows: the result of the data analysis has confirmed the existence of a positive and significant influence of service quality on student satisfaction, there is a positive and significant influence of student satisfaction on student loyalty, there is no positive or significant influence of service quality on student loyalty, and university image has a positive and significant influence on both student satisfaction and student loyalty.

The originality of this study has been confirmed, considering the fact that only few studies on service quality in education field were conducted. In this study, researchers were interested in developing the service quality based on five dimensions. This model have been applied by a number of researchers. Unfortunately, some other researchers showed their disagreements upon the use of only these five dimensions in the research in the field of education, and they suggested that more appropriate dimensions should be applied.

Purpose – The purpose of this study was to determine the efficacy value of national street lighting on energy conservation and carbon dioxide (CO₂) emission reduction.

Design/Methodology/Approach – The methods used are the measurement of electrical parameters (low voltage network), the national road illumination level with SON lamp specification, 400 W, 180 W, and 110 Lumen/W, the simulation of energy conservation calculation, and the CO₂ emission reduction obtained by utilizing panel solar cells as a source of energy and LED lights for illumination.

Finding – The results show the efficacy of a 100-W light bulb at an altitude of 8 m for the following specification of light bulbs: LED, 130 Lumens/W, SON, 110 Lumen/W, and MBF, 53 Lumen/W gives the illumination level respectively 13,913 Lux, 11,773 Lux, and 5,672 Lux. By replacing the 180 W SON lamp with an LED, 100 W, of energy conservation by 3.171 GW h is obtained, which is equivalent to a CO₂ emission reduction of 3.641 kTon CO₂.

Originality/Value – This study is a continuation of a study of energy conservation with the utilization of solar cells as an electrical power source for an LED bulb that replaces low-voltage networks as a power source for the bulb type SON.

Purpose – The purpose of the research aims to observe the high growth of corn crops with a different cropping pattern.

Design/Methodology/Approach – The research is conducted based on field experiments with Group Randomized Design (hereafter RAK shortened from Cluster Random Design). The treatment of cropping pattern I is that corn crops are planted in one row with the size of plot 9 m × 4 m, and the distance planting of the crops is 70 cm × 40 cm. Cropping pattern II is that corn crops are planted in two rows with the size of plot 9 m × 4 m, and the distance planting is 70 cm × 40 cm. Cropping pattern III is that corn crops are planted in three rows with the size of plot 9 m × 4 m, and the distance among the crops is 70 cm × 40 cm.

Findings – The result of research shows that the highest corn crops are from cropping pattern II.3 at age 15 and 30 after planting time (called HariSetelahTanam or HST). The increase of cropping rows from one row to two rows indicates that intra-specific competition are more dominant. The growth of crops is faster because they need full sunlight at vegetative and generative stages. The need of full sunlight at the growing stage causes the increasing of stem height of crops to enable the crops to receive the sunlight optimally due to the continuity of photosynthesis process. The increasing growth of stem diameter is in accordance with the growth speed of height plant at the same age.

Research Limitations/Implications – This research intends to find out the best growing process of the plant. Further research is needed to study the outcome of final product of the plant.

Practical Implications – This is to see the utilization of the best cropping pattern and optimal land utilization.

Originality/Value – High growth of corn crops and stem diameter (Zea may, S) with a different cropping pattern has not yet been published.

Purpose – To predict the existence of the aquifer, search the location, position, thickness, deep and dissemination of subsurface aquifer and predict the environmental condition by conducting the groundwater/aquifer condition.

Design/Methodology/Approach – The way to know the state of groundwater aquifers, one of which is the Geo-electric Method by using the Resistivity Schlumberger Method.

Findings – Pouple activities are not many effects to the groundwater but more time depend on the development, it can many influences to environmental conditions.

Research Limitations/Implications – The analysis is conducted to every point but on this research, it is on mentioned and taken from one sample only, it is HPR.

Practical Implications – In anticipation the effect of the development of the region in general, it is necessary to be able businesses for raw water, irrigation and Industry of the groundwater can be as well as how to control over the distribution and causes of infiltration into the soil.

Originality/Value – That is by measuring the resistivity and mapping dealer spread a layer of groundwater (aquifers) that an overview of the groundwater can be known.