Increased energy demand in recent decades has resulted in both an energy crisis and carbon emissions. As a result, the development of cleaner fuels has been under the research spotlight. Low-rank coals are geographically dispersed, abundant, and cheap but are not utilized in conventional processes. Syngas can be produced from coal-using gasification which can be used in various chemical engineering applications. In this study, the process model for syngas production from low-rank coal is developed and the effects of various process parameters on syngas composition are evaluated, followed by a technical and economic evaluation. The syngas production rate for the low-rank coal has been evaluated as 25.5 kg/s, and the contribution to H₂ and CO production is estimated as 1.59 kg/s and 23.93 kg/s, respectively. The overall syngas production and energy consumed in the process was evaluated as 27.68 kg/GJ, and the CO₂ specific emissions were calculated as 0.20 (mol basis) for each unit of syngas production. The results revealed that the syngas production efficiency for low-rank coals can be as high as 50.86%. Furthermore, the economic analysis revealed that the investment and minimum selling prices per tonne of syngas production are EUR 163.92 and EUR 180.31, respectively.

The Qutb complex in Delhi contains the array of early Sultanate Period Muslim monuments that demonstrate the earliest artwork development stage of Muslim monuments from 12 to 13th century especially the architecture style and the stone carving patterns that exists in the monuments of this complex like in masjid Quwat-ul Islam (1191 A.D), Qutab Minar (1202 A.D), Illttutmish Tomb (1235 A.D), Alai Darwaza (1311 A.D). These splendid monuments have a new architectural style in India. Their beautiful carvings in red sandstone and marble that includes the patterns of arabesque style along with Kufic and Naskh calligraphy, the delicate floral and geometric patterns along with some Hindu motifs that depicts the earliest amalgamation of Hindu and Islamic architecture within the subcontinent. This paper not only aim to explore the architectural plan of this Qutb complex under different monarchs but also the decoration of this Qutb complex, its analysis and the aesthetic changes of design after the amalgamation of two different cultures. This complex is famous not only for its architecture but also for varieties of decorative arts. This paper also attempts to discover not only aesthetics but also the traditional and regional logic for using these motifs. This explorative study is from available historical data and literature. In the end concludes that the amalgamated motifs of decoration was excellent experiment and first addition in the design vocabulary of Indo-Muslim art and architecture. These designs provide serenity and majestic feelings to these monuments and in whole to Qutb complex.