The increase in the number of power-driven hammer-mills in the rural areas of Southern Rhodesia is causing a rapid reduction in the amount of grain ground by women in the villages, except in the remoter areas, where the main crop is usually sorghum or millet. The meal produced by hammer-mills is substantially straight-run and is usually modified slightly by sifting before cooking, the coarser, ...

DNA isolation from hair shafts can involve a number of steps, each of which adds time to the procedure and increases the risk of contamination. A simple alkaline digestion procedure that directly dissolves hairs was developed and compared with a widely used glass grinding/organic extraction method, using samples collected from 30 volunteers with varying population ancestries, hair colors, and h...

INTRODUCTION The manufacturing of complex shaped microstructures on microsystem parts in brittle materials provides a high geometrical accuracy [1]. This requirement can only be met by using microgrinding processes. There, metal bonded diamond grinding tools offer a remarkable potential due to their favorable wear behavior [2]. However, the dressing of complex microprofiles on these tools is no...

The beneficiation process contains a number of links which are closely related to all aspects of the quality of products in a process which has a direct impact on the next one, thus influencing the product quality of all processes. Grinding operations form a critical stage in the middle position of the beneficiation process and is the most important part. Grinding operations here refers to ore ...

Thermal pretreatment or torrefaction of biomass under anoxic condition can produce an energy dense and consistent quality solid biomass fuel for combustion and co-firing applications. This paper investigates the fuel characteristics and grindability of pine chips and logging residues torrefied at temperatures ranging from 225 °C to 300 °C and 30 min residence time. Grinding performance of torre...

This paper analyses the fracture behavior of the brazed BCBN grain by comparison with brazed PCBN grain through grinding test of Nickel-based superalloy. The self-sharpening effect is created by timing micro-fracture behavior for BCBN abrasive grains, but by macro-fracture behavior for PCBN abrasive grains. During grinding with brazed BCBN abrasive grains, the material is removed together with ...

This paper discusses the application of an eco-grinding system using a mixture of compressed cold air and vegetable oil. The feasibility of the system was assessed using the surface grinding of plain carbon steel 1045 with a BWA60MVA1 wheel. The investigation showed that cold air can be used to suppress surface burning under certain material removal rates and has an advantage of reduced grindin...

The hardened alpha-case (alpha-case) layer inevitably forms on the surface of titanium castings when prepared by investment casting. Because the hardness of the alpha-case is incomparable to that of the interior structure, the perception exists that the alpha-case is difficult to remove during cutting, grinding and polishing. Grindability (ease of grinding) of cast cpTi and cast Ti-6Al-4V was e...

Abstract Aerostatic spindles are used in precision grinding applications requiring high stiffness and very low error motions (5 to 25 nm). Forces generated during precision grinding are small and present challenges for accurate and reliable process monitoring. These challenges are met by incorporating non-contact displacement sensors into an aerostatic spindle that are calibrated to measure gri...

Successful of grinding in practice is highly depending on the level of expertise of the machinist and engineer. Knowledge Management might offer a strategy to keep the valuable knowledge. The main objective of Knowledge Management (KM) is to manage knowledge process, the knowledge itself could not be managed, what can be managed is the knowledge gathering, storing and organizing, retrieving, an...