industry or apparel industry is primarily concerned with the production of yarn‚ and cloth and the subsequent design or manufacture of clothing and their distribution. The raw material may be natural‚ or synthetic using products of the chemical industry. Cotton is the world’s most important natural fibre. In the year 2007‚ the global yield was 25 million tons from 35 million hectares cultivated in more than 50 countries.[1] There are five stages[2] Cultivating and Harvesting Preparatory Processes
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Section A Multiple choice (17 marks) Do NOT Write on this section of the paper. Answer ALL questions in the table provided at the start of Section B Question 1. Which of the following best describes the structure of metals? A lattice of A. alternating positive and negative ions B. positive ions surrounded by freely moving electrons C. molecules held together by covalent bonds D. atoms held together by covalent bonds Question 2. Which of the following is not a property of most metals
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industrial process in manufacture of ammonia 9.3 Alloys 9.3.1 Physical properties of pure metals 9.3.2 Meaning and purpose of making alloys 9.4 Synthetic polymers 9.4.1 The meaning and types of polymers 9.4.2 Advantages of synthetic polymers 9.4.3 Environmental pollution caused by synthetic polymers 9.4.4 Methods to overcome the environmental pollution caused by synthetic polymers 9.5 Glass and ceramics 9.6 Composite material Conclusion References Page 3 4 5 7 10 11 12 13 14 15 16 17 17 18 18 22 24 25
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|15 | |Composition‚properties and uses of alloys |16 | |(D) Synthetic polymers
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CHEMICAL INDUSTRY The chemical industry comprises the companies that produce industrial chemicals. It is central to modern world economy‚ converting raw material (oil‚ natural gas‚ air‚ water‚ metals‚ and minerals) into more than 70‚000 different products. The chemical industry is a key contributor to the world economy. It is a knowledge-based industry with significant investments in R&D. The industry supplies to virtually all sectors of the economy. In terms of consumption‚ the chemical industry
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in the consumer market‚ stemming from the rise of synthetic fibers starting in the 1940’s‚ glass fiber and carbon fibers have dominated the market for composites due to their superior mechanical properties. From the 1970’s onward‚ petroleum-based fibers replaced natural fiber so that‚ worldwide‚ the cropping of natural fibers entered into steep decline‚ causing economic stagnation in the producer regions. In addition to the competition with synthetic fibers‚ innovation in transport facilities also
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Locard’s Exchange Principle. This states that “every contact leaves a trace”‚ implying that a criminal will leave trace and take away trace evidence when at a crime scene. Trace evidence often refers to minute samples of a substance‚ particularly fibres‚ hairs‚ glass fragments and paint chips. Crime scenes will commonly contain trace evidence‚ often caused by the perpetrator unconsciously coming into contact with surfaces and leaving behind or picking up particulates. Trace evidence is created
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sunlight‚ killing our aquatic animals. Thus‚ the researchers thought of discovering helpful products of the said plant. For the time being‚ ropes are being used by other people in their jobs. Take for instance in construction sites – synthetic ropes are in demand. But synthetic ropes are not environment-friendly and when disposed are not easily decomposed. Thereafter‚ the researchers thought of using the stalk of water hyacinth in producing an environment-friendly rope. In this way‚ people will not only
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“Goods for Sale”. For example‚ cotton‚ polyester‚ viscose‚ fibre‚ yarn and et cetera. For “Goods for Sales” inventory is usually divided into 1. Raw Materials : a) Natural Raw Materials: Cotton‚ Wools and etc. b) Synthetic Raw Materials: Acrylic‚ Viscose‚ Nylon‚ Polyester‚ etc. 2. Work in Process (WIP) : It’s starting with making Fibre from raw materials (Natural and Synthetic). Following by the process of spinning with the produced Fibre and come out with Yarn as the final product in spinning
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nociceptive stimuli which activates pain receptors on neurons called nociceptors. Nociceptors can be placed into two categories: A-delta (Aδ) fibres and C-fibres. A-delta fibres are small‚ myelinated‚ neurons that transmit signals fast and mediate sharp pain. C-fibres are smaller unmyelinated neurons that slowly transmit signals. They mediate dull‚ aching pain. Both types of fibres stimulate secondary neurons that establish the ascending pathway which projects to the Thalamus in the brain. Sensations of
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