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Science, Technology And Innovation Indicators : Lessons from the Development Experience in Africa
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Research and Technical Writing for Science and Engineering
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Practical Crystals : Crystals for Holistic Wellbeing
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What are exactly mixed crystals in materials science?
Mixed crystals in materials science refer to solid solutions in which two or more different types of atoms or ions are randomly distributed within the crystal lattice. This means that the crystal structure contains a mixture of different elements, resulting in a single, homogeneous phase. Mixed crystals can exhibit a range of properties that are intermediate between those of the pure components, making them important in the design and engineering of materials with specific characteristics. They are commonly found in alloys, semiconductors, and other types of materials.
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What are two applications of ice crystals in technology?
Ice crystals are used in cryopreservation to preserve biological materials such as cells, tissues, and organs for medical and research purposes. By freezing these materials, ice crystals can help maintain their viability and functionality for extended periods of time. Additionally, ice crystals are used in the production of ice lenses for ground improvement in geotechnical engineering. When water freezes in the soil, it forms ice lenses that can increase the soil's strength and stability, making it suitable for construction and infrastructure projects.
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Are those crystals?
Yes, those are crystals. They are formed by the solidification of minerals under certain conditions, resulting in their characteristic geometric shapes and structures. Crystals can be found in various natural formations and are also commonly used in jewelry and decorative items.
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Are crystals haram?
In Islam, crystals themselves are not inherently haram (forbidden). However, the use of crystals for purposes such as shirk (associating partners with Allah), seeking guidance from them instead of Allah, or believing in their powers to predict the future would be considered haram. It is important for Muslims to be cautious and mindful of their intentions when using crystals and to ensure that their beliefs and practices align with Islamic teachings.
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Study Skills for Science, Engineering and Technology Students
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Salt Crystals
Five hundred miles from mainland Colombia, grassroots resistance, sloppy vacationers, and a muddy history of conquest converge for Verónica, returning after living in Mexico City, ready to understand herself and the place she came from. San Andrés rises gently from the Caribbean, part of Colombia but closer to Nicaragua, the largest island in an archipelago claimed by the Spanish, colonized by the Puritans, worked by slaves, and home to Arab traders, migrants from the mainland, and the descendants of everyone who came before. For Victoria – whose origins on the island go back generations, but whose identity is contested by her accent, her skin colour, her years far away – the sunburnt tourists, sewage blooms, sudden storms, and ‘thinking rundowns’ where liberation is plotted and dinner served from a giant communal pot, bring her into vivid, intimate contact with the island she thought she knew, her own history, and the possibility for a real future for herself and San Andrés.
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Lemon Crystals
Delicious lemon flavour crystals - dip a lolly in or your finger is just as good! - Qty In Order: 200 grams (7.07 oz)
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Orange Crystals
Delicious orange flavoured sherbet crystals - dip a lolly in or your finger is just as good! - Qty In Order: 200 grams (7.07 oz)
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Are crystals dangerous?
Crystals themselves are not inherently dangerous, but certain types of crystals can be toxic if ingested or handled improperly. For example, lead-based crystals can be harmful if ingested or if their dust is inhaled. Additionally, some crystals can have sharp edges and may break or shatter, posing a physical danger if mishandled. It's important to research and handle crystals with care, especially if you have pets or small children in your home.
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How are crystals grown?
Crystals are typically grown through a process called crystallization, where a solid forms from a solution, melt, or vapor. In solution crystallization, a solute is dissolved in a solvent to create a supersaturated solution, which is then allowed to cool or evaporate, causing the solute to come out of solution and form crystals. In melt crystallization, a substance is heated to form a liquid melt, which is then allowed to cool and solidify into crystals. Vapor crystallization involves the deposition of crystals from a vapor phase onto a solid surface. These processes allow for the controlled growth of crystals with specific shapes and properties.
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Don't salt crystals grow?
Yes, salt crystals do grow. When a salt solution evaporates, the water molecules leave the solution, causing the salt molecules to come together and form solid crystals. This process is called crystallization, and it is how salt crystals are formed. As the water continues to evaporate, the salt crystals continue to grow in size.
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Are these crystals friends?
Crystals are inanimate objects and do not have the capacity for friendship as humans do. However, some people believe in the metaphysical properties of crystals and may use them as tools for healing, meditation, or spiritual practices. In this context, individuals may form a personal connection with certain crystals and consider them to be helpful or supportive, but this is based on personal belief rather than the crystals having the ability to form friendships.
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