This research examines the suitability of e-commerce practices with the principles of fiqh muamalah in Islam, especially in the aspects of transaction validity, justice, consumer protection, and the application of business ethics. The method used is descriptive qualitative with a literature research approach to analyze Islamic economic theory, fiqh muamalah regulations, and their relevance to digital transaction practices. The research data was obtained from secondary literature sources, including books, scientific journals, fatwas from the National Sharia Council of the Indonesian Ulema Council (DSN-MUI), as well as references from the Qur'an and Hadith.The results show that e-commerce practices are acceptable in Islam as long as they fulfill principles such as transparency, honesty, and transaction security. Salam and istisna' contracts are identified as the most suitable contracts for digital transactions as they fulfill the terms and conditions stipulated in Islamic law for buying and selling. However, challenges such as uncertainty (gharar), usury, fraud (tadlis), and gambling (maisir) need attention through regulation and the application of business ethics based on Islamic law. This research is expected to contribute to business people, policy makers, and academics in integrating Islamic economic values with technological advances to build a fair and sustainable business ecosystem.Keywords: E-commerce, Fiqh Muamalah, Islamic Economics, Salam Contract, Maqashid Sharia.

Briquettes are a type of alternative energy whose raw material source comes from agricultural waste such as coconut shells. Coconut shells are converted into charcoal which has a higher calorific value through the pyrolysis process. The aim of this research is to determine the effect of comparing particle size and printing pressure on the length of burning time and burning temperature, so as to obtain a briquette composition that is durable and produces high temperatures. In this research, the raw material used was shell waste with a drying process of 400°C and the particle size variations used were mesh 30, 150 and 250 mixed with 12 grams of starch adhesive. The briquette molding process uses 3 kg and 5 kg pressure, which are then dried using an oven at a temperature of 750°C for 3 hours. Tests were carried out on burning time, burning temperature, water content and ash content. From the research results, it was found that for the highest temperature, briquettes with a particle size of 250 mesh were produced with a pressure of 5 kg at 312°C, and the flame duration of the briquettes was 240 minutes.

Briquettes are a type of alternative energy whose raw material source Plastic waste is an environmental problem faced by the people of Indonesia and the world. On the other hand, the production of waste generated in various institutions and sectors in Indonesia continues to increase every year, including the industrial sector whose production process is large-scale. Its use as a basic material for packaging bottles reaches 30% of world use. PET is also used as a synthetic fiber or polyester which accounts for 60% of world use. Study the author will do that is to make a tubing made from PET plastic waste that can be used as raw material for tubing. Using temperature variations (190?, 200?, 210?), then 9 samples from each variation will be micro-photographed the effect of temperature on tubing results and tested for maximum tensile. After that, calculations are carried out to obtain the maximum tensile stress and strain values. Then the average maximum load value that can be received by PET tubing is highest at 190ºC temperature tubing has the ability to withstand tensile strength better than all temperature variations so that the average value is 35.94 N/mm2 and 200ºC is able to withstand 35.49 N/mm2 and 210ºC with 18.30 N/mm2. It can be interpreted that the higher the temperature, the effect on holding the tensile strength of the PET tubing and making the plastic structure change so that 210oC is close to the recycling value, while for temperatures below it is still non-recycled.

The current fuel is still sourced from fossil fuels, namely oil, coal and The current fuel is still sourced from fossil fuels, namely oil, coal and gas, which have many impacts on the environment. As an agricultural country located in the tropics, Indonesia is rich in biomass energy sources. In this research, the use of candlenut shells will be used or processed into alternative fuel, namely briquettes, with the aim of determining the value of combustion time and temperature produced through variations in composition and mesh size. The results of the research show that the effect of the burning temperature has an impact on the burning time of the briquettes and the resulting temperature, where the best burning time and temperature values ??of the briquettes are produced by a burning temperature of 400°C with a grain size of 100 mesh, namely 177 minutes with an average burning temperature briquettes 193.9°C.

The transformation of the digital economy presents new challenges for the Islamic business law system, which is based on the principles of justice, transparency, and blessing. The dynamics of the digital economy, such as e-commerce, fintech, and blockchain, require the reconstruction of Islamic business law to remain relevant and responsive to contemporary developments. This study aims to analyze the necessity of reconstructing Islamic business law in response to the digital economy transformation, using a qualitative approach based on literature review. The findings reveal legal vacuums, a lack of specific regulations, and challenges in integrating Sharia principles into the digital ecosystem. Therefore, regulatory updates, the strengthening of Sharia economic legal literacy on social media, and innovation in digital economic fatwas are needed to build a fair, sustainable, and Sharia-compliant business ecosystem aligned with the maq??id al-shar?’ah.Keywords : digital economy, fintech Sharia, Islamic business, legal reconstruction, digital transformation.

Along with the times, the availability of fossil energy is decreasing, especially natural gas and coal, before using fossil energy, humans have used biomass as an energy source. Indonesia has many plantation commodities, one of which is coffee which is the fourth largest coffee producer in the world. Coffee grounds are the main waste produced by coffee shops and are usually only thrown away. The main ingredients in this study were arabica coffee grounds and robusta. By using robusta composition 60% arabica 40%, robusta 50% arabica 50% robusta 40% arabica 60%. In addition, briquettes are tested for hardness by making points on the surface of the briquettes using a durometer shore A tool of 30 points, then a calorimeter bomb test is carried out to obtain the calorific value content. The result obtained from the highest hardness value is briquettes with a robusta mixture of 50% arabica 50% with a value of 23.7 HA, while the highest calorific value is found in a robusta mixture of 60% arabica 40% with a value of 4526.85 cal / gram.

This research examines the use of sharia contracts in Indonesian Islamic banking practices, focusing on the legal, financial, and religious facets of Islamic law. The primary goal is to examine the use of several Islamic contracts in actual financial transactions, including mudharabah, musyarakah, murabahah, ijarah, qardhul hasan, wakalah, kafalah, salam, and istisna, as well as how the hadith validates their validity. This study employed a normative legal method and a literature survey to qualitatively analyze both classical and modern sources, including national regulatory systems. The findings demonstrate that while the use of Islamic contracts improves equity, openness, and risk sharing, practical compliance, legal harmonization, and public literacy issues make implementation difficult. Strengthening regulatory congruence, boosting stakeholder education, and bolstering the sharia supervisory system are among the recommendations made to guarantee the integrity of Islamic banking operations. In line with Islamic principles, this study advances our knowledge of Islamic contracts as a crucial tool for creating a just and long-lasting financial system. Keywords : Islamic banking, Islamic contract, jurisprudence, sharia compliance, transaction

This research aims to examine the application of business ethics in Islam, particularly moral principles in muamalah transactions, as well as the challenges faced in its implementation in the modern era. Using a descriptive qualitative approach based on a literature study, this research highlights key values such as honesty, openness, trustworthiness and responsibility as the foundation of Islamic business ethics. The case study of Toko Roti Gembul in Pontianak shows how these principles can be applied in the business world. The results also reveal various challenges, such as a lack of understanding of sharia concepts, weak supervision, and not optimal integration of Islamic values in business strategies. Al-Ghazali's thoughts on positive motivation and business as fardhu kifayah also strengthen the urgency of ethics in building a fair and sustainable economic system. This research is expected to be an academic and practical contribution in encouraging the application of Islamic values in modern business activities.Keywords: Islamic business ethics, morals, muamalah, transactions, sharia principles.

Sitiung is a nagari in West Sumatra. It is located in Sitiung District, Dharmasraya Regency, West Sumatra Province. This Nagari has an area of about 32.27 km2 and is about 18 km from Punjung Island, the capital of the regency. It is also the administrative center of Sitiung Sub-district. Mapping was conducted in the area to determine the administrative boundaries between jorong and the topography of the nagari. A map is simply defined as a representation of an area in which symbols indicate information about the area. Due to the fact that maps indirectly serve as a communication tool between the creator and the person reading it, the captions relating to the contents of the map are very important. The more detailed and complete the information contained in the map, the better and higher quality it is. In addition, it is easier for readers and users to use it. Data collection in the field can be done in various ways. Administrative and Topographic maps will be produced from the measurements taken.