http://nopr.niscpr.res.in/handle/123456789/58248 2026-10-10T13:33:32Z http://nopr.niscpr.res.in/handle/123456789/58258 Title: Assessment of geotechnical properties of lunar soil simulant’s for lunar missions Authors: Thannasi, Prabu; Muthukkumaran, Kasinathan; Indaram, Venugopal Abstract: Prototype-based experimental studies at the simulated environmental conditions are essential for the planned Chandrayaan missions of the Indian Space Research Organization (ISRO). A large quantity of lunar simulants was needed to prepare the lunar surface testbed, which cost more expensive to import. Therefore, the ISRO has intended to develop an indigenous new lunar simulant. All the available lunar soil simulants have been developed to mimic the actual lunar soil properties. Likewise, the new lunar soil simulant should mimic the properties of actual lunar soil. Hence, it is essential to examine the fidelity and properties of the existing lunar simulants with the actual lunar soil. This paper reviews the chemical composition, mineralogy, geotechnical and geomechanical properties of the past developed lunar simulants (mare and highland simulants) with actual lunar soils. Also, the review has provided an increased understanding of previous research on lunar soil development methods and materials used. Both mare and highland simulants discussed have variations with actual lunar soil; because the lunar simulants have been tested in the terrestrial environment, which can have significant effects on results. The variations between terrestrial simulants and lunar regolith and the related engineering implications are discussed. Page(s): 317-329 2021-08-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/58257 Title: Additive manufacturing: The significant role in biomedical and aerospace applications Authors: Pant, Meena; Pidge, Pritam; Kumar, Harish; Nagdeve, Leeladhar; Moona, Girija Abstract: Additive Manufacturing (AM) is an innovative approach to manufacturing, which has proved itself way too efficient and opening a new era for complex designs and lattice structures. AM is a bottom-up manufacturing process that builds parts by stacking one layer over another. It is often called 3D printing which directly prints the object via material addition instead of subtraction in conventional manufacturing methods. It has shown a tangible approach to mass customization and unhindered options to create a complex design part. It has proved itself in many industries like the biomedical industry, aerospace industry, manufacturing firms, and academic research purposes. This article has reviewed the advancement of AM in the aerospace and biomedical industry. 3D printing technology has been incorporated in the biomedical industry to produce customized design features and implants for specific applications and performance. Implants effect like corrosion and carcinogenic properties have been discussed in the human body. This paper also discussed the design flexibility of AM with the topological study of a specific part to reduce the weight for system efficiency in the aerospace industry. Page(s): 330-342 2021-08-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/58256 Title: Designed and fabricated a low-cost E-Spun experimental tool for polymer processing Authors: Chavan, Chetan; Bhajantri, Rajashekhar Fakeerappa; Bulla, Soumya Siddalingappa; Sakthipandi, Kathiresan Abstract: Nanoscale fiber processing involves advanced technology that is challenging to use and setup in the laboratory at low cost. To deal with such a dilemma, this experimental setup explores the notion that would stimulate researchers' curiosity about the polymer processing electrospinning tool. This study has presented a simple, precise, portable, cost-effective, and economical electrospinning setup as a learning resource that is well-suited, laid-back and requires intangible knowledge of fabricating and installation. This proposed instrument consists of two main units syringe pump and stationary collector. A medical grade syringe has been used as a pump sprayer to spray the fibers. Super arc 1000 kV high-voltage generator has been used for electrospinning setup. A flat copper plate has been used as an electrode to secure the fibers of the prepared viscous PVA solution. A set of experiments have been carried out to evaluate the performance of the proposed and described design. Surface morphology results have been examined by SEM at different magnifications, confirming the formation of fibers and the diameter of PVA fibers is 0.926 μm. XRD studies have been used to verify that the crystallinity increases by 23.22% to 25.54%, which shows a gradual optimization in mechanical properties. Page(s): 343-349 2021-08-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/58255 Title: Ground granulated blast furnace slag based Geopolymer Mortar activated with low concentration alkali Authors: Singha, Ashita; Bhadauria, Sudhir Singh; Mudgal, Manish; Srivastava, Avanish Kumar Abstract: Infrastructural development requires large quantity of Ordinary Portland cement. Its manufacturing process emits enormous amount of carbon dioxide, thereby deteriorating the environment. Thus, an alternative binder known as geopolymer, developed using alumino-silicate rich materials like fly ash, silica fume, metakaoline etc., activated by suitable alkalis may serve as a substitute to conventional cement. The present research work focuses on preparation of ground granulated blast furnace slag based geopolymer mortar with ambient temperature curing at 27°C at low concentration of alkali activators. Compressive strength of geopolymer mortar at different concentration of activator and microstructure isstudied. The concentration of alkali activators is optimized by trials in laboratory and maximum compressive strength of 64.29 MPa is achieved. Page(s): 350-357 2021-08-01T00:00:00Z