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Scission
Scission may refer to: * Scission (chemistry), bond cleavage, the splitting of chemical bonds ** Chain scission, the degradation of a polymer main chain ** Beta scission, reaction in thermal cracking of hydrocarbons * ''Scission and Other Stories ''Scission and Other Stories'', sometimes simply ''Scission'', is a 1985 collection of short stories by Australian author Tim Winton. It won the 1985 Western Australian Council Literary Award, and was also 1985 Joint Winner Western Australian P ...'', a 1985 collection of short stories * Instruction scission, opcode overlapping in computing See also * Scission (a cut-out piece), term involved in development of senses of word "sect" {{Disambiguation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Scission And Other Stories
''Scission and Other Stories'', sometimes simply ''Scission'', is a 1985 collection of short stories by Australian author Tim Winton. It won the 1985 Western Australian Council Literary Award, and was also 1985 Joint Winner Western Australian Premier's Book Award - Fiction. Contents This was Winton's first collection of stories. There are 13 short stories: *''Secrets'' *''A Blow, a Kiss'' *''Getting Ahead'' *''My Father's Axe'' *''Wake'' *''Lantern Stalk'' *''Thomas Awkner Floats'' *''Wilderness'' *''Neighbours'' *''A Measure of Eloquence'' *''The Oppressed'' *''The Woman at the Well'' *''Scission''. The stories are described as, " ... spare, jagged stories in which people struggle with change and disintegration ... These startling stories deal with men, women and children whose lives are coming apart and whose hearts are breaking. Honest, beautiful, shattering tales - vintage Winton." Themes The title ''Scission'' describes the action or state of cutting or b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Scission (chemistry)
In chemistry, bond cleavage, or bond fission, is the splitting of chemical bonds. This can be generally referred to as dissociation when a molecule is cleaved into two or more fragments. In general, there are two classifications for bond cleavage: ''homo''lytic and ''hetero''lytic, depending on the nature of the process. The triplet and singlet excitation energies of a sigma bond can be used to determine if a bond will follow the homolytic or heterolytic pathway. A metal−metal sigma bond is an exception because the bond's excitation energy is extremely high, thus cannot be used for observation purposes. In some cases, bond cleavage requires catalysts. Due to the high bond-dissociation energy of C-H bonds, around , a large amount of energy is required to cleave the hydrogen atom from the carbon and bond a different atom to the carbon. Homolytic cleavage In homolytic cleavage, or homolysis, the two electrons in a cleaved covalent bond are divided equally between ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chain Scission
Chain scission is a term used in polymer chemistry describing the degradation of a polymer main chain. It is often caused by thermal stress (heat) or ionizing radiation (e.g. light, UV radiation or gamma radiation), often involving oxygen. During chain cleavage, the polymer chain is broken at a random point in the backbone to form two - mostly still highly molecular - fragments.Sebastian Kotzenburg, Michael Maskus, Oskar Nuyken: ''Polymere – Synthese, Eigenschaften und Anwendungen'', Springer Spektrum, 2014, S. 440–441, . Depolymerization, on the other hand, is the elimination of low molecular weight substances (monomer In chemistry, a monomer ( ; ''mono-'', "one" + '' -mer'', "part") is a molecule that can react together with other monomer molecules to form a larger polymer chain or three-dimensional network in a process called polymerization. Classification ...s, dimers and suchlike) from a polymer.Otto-Albrecht Neumüller (Herausgeber): ''Römpps Chemie Lexi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Beta Scission
Beta scission is an important reaction in the chemistry of thermal cracking of hydrocarbons and the formation of free radicals. Free radicals are formed upon splitting the carbon-carbon bond. Free radicals are extremely reactive and short-lived. When a free radical in a polymer chain undergoes a beta scission, the free radical breaks two carbons away from the charged carbon producing an olefin In organic chemistry, an alkene is a hydrocarbon containing a carbon–carbon double bond. Alkene is often used as synonym of olefin, that is, any hydrocarbon containing one or more double bonds.H. Stephen Stoker (2015): General, Organic, an ... (ethylene) and a primary free radical, which has two fewer carbon atoms. In organic synthesis, beta scission can be used to direct multistep radical transformations. For example, beta-scission of a weak C-S bond was used to favor one of two equilibrating radicals in metal free conversion of phenols to aromatic esters and acids via C-O trans ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Instruction Scission
In computer programming, machine code is any low-level programming language, consisting of machine language instructions, which are used to control a computer's central processing unit (CPU). Each instruction causes the CPU to perform a very specific task, such as a load, a store, a jump, or an arithmetic logic unit (ALU) operation on one or more units of data in the CPU's registers or memory. Early CPUs had specific machine code that might break backwards compatibility with each new CPU released. The notion of an instruction set architecture (ISA) defines and specifies the behavior and encoding in memory of the instruction set of the system, without specifying its exact implementation. This acts as an abstraction layer, enabling compatibility within the same family of CPUs, so that machine code written or generated according to the ISA for the family will run on all CPUs in the family, including future CPUs. In general, each architecture family (e.g. x86, ARM) has its own I ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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