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Wendy Flavell
Wendy Ruth Flavell (born 1 September 1961) is Vice Dean for Research and a Professor of Surface Physics in the School of Physics and Astronomy at the University of Manchester. Her research investigates the electronic structure of complex metal oxides, chalcogenides, photoemission and photovoltaics. Education and early life Flavell was born in Bilston to Maurice and June Flavell. She was educated at Wolverhampton Girls' High School and studied physics (Bachelor of Arts) at the University of Oxford followed by a Doctor of Philosophy degree in 1986. Her doctoral research investigated electron spectroscopy of metal oxides and supervised by P.A. Cox. Career and research Flavell joined Imperial College London as a Royal Society University Research Fellow. In 1990 Flavell joined the University of Manchester Institute of Science and Technology (UMIST) in the Department of Chemistry. In 1998 Flavell became the sixth woman in the United Kingdom to be appointed Professor of Physic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bilston
Bilston is a market town, ward, and civil parish located in Wolverhampton, West Midlands, England. It is close to the borders of Sandwell and Walsall. The nearest towns are Darlaston, Wednesbury, and Willenhall. Historically in Staffordshire, three wards of Wolverhampton City Council now cover the town: Bilston East and Bilston North, which almost entirely comprise parts of the historic Borough of Bilston, and Ettingshall, which comprises a part of Bilston and parts of Wolverhampton. History Bilston was first referred to in AD 985 as ''Bilsatena'' when Wolverhampton was granted to Wulfrun then in 996 as ''Bilsetnatun'' in the grant charter of St. Mary's Church (now St. Peter's Collegiate Church, Wolverhampton). It is later mentioned in the Domesday Book as a village called ''Billestune'', being a largely rural area until the 19th century. ''Bilsetnatun'' can be interpreted as meaning the settlement (''ton'') of the folk (''saetan'') of the ridge (''bill''). Situated tw ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Photovoltaics
Photovoltaics (PV) is the conversion of light into electricity using semiconducting materials that exhibit the photovoltaic effect, a phenomenon studied in physics, photochemistry, and electrochemistry. The photovoltaic effect is commercially used for electricity generation and as photosensors. A photovoltaic system employs solar modules, each comprising a number of solar cells, which generate electrical power. PV installations may be ground-mounted, rooftop-mounted, wall-mounted or floating. The mount may be fixed or use a solar tracker to follow the sun across the sky. Photovoltaic technology helps to mitigate climate change because it emits much less carbon dioxide than fossil fuels. Solar PV has specific advantages as an energy source: once installed, its operation generates no pollution and no greenhouse gas emissions, it shows scalability in respect of power needs and silicon has large availability in the Earth's crust, although other materials required in PV system m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Research Excellence Framework
The Research Excellence Framework (REF) is a research impact evaluation of British higher education institutions. It is the successor to the Research Assessment Exercise and it was first used in 2014 to assess the period 2008–2013. REF is undertaken by the four UK higher education funding bodies: Research England, the Scottish Funding Council (SFC), the Higher Education Funding Council for Wales (HEFCW), and the Department for the Economy, Northern Ireland (DfE). Its stated aims are to provide accountability for public investment in research, establish "reputational yardsticks", and thereby to achieve an efficient allocation of resources. Critics argue, inter alia, that there is too much focus on the impact of research outside of the university system, and that impact has no real relevance to the quality of research. It is suggested that REF actually encourages mediocrity in published research, and discourages research which might have value in the long term. It has repeatedly bee ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cadmium Telluride
Cadmium telluride (CdTe) is a stable crystalline compound formed from cadmium and tellurium. It is mainly used as the semiconducting material in cadmium telluride photovoltaics and an infrared optical window. It is usually sandwiched with cadmium sulfide to form a p–n junction solar PV cell. Applications CdTe is used to make thin film solar cells, accounting for about 8% of all solar cells installed in 2011. They are among the lowest-cost types of solar cell, although a comparison of total installed cost depends on installation size and many other factors, and has changed rapidly from year to year. The CdTe solar cell market is dominated by First Solar. In 2011, around 2 GWp of CdTe solar cells were produced; For more details and discussion see cadmium telluride photovoltaics. CdTe can be alloyed with mercury to make a versatile infrared detector material (HgCdTe). CdTe alloyed with a small amount of zinc makes an excellent solid-state X-ray and gamma ray detector ( Cd ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tin(IV) Oxide
Tin(IV) oxide, also known as stannic oxide, is the inorganic compound with the formula SnO2. The mineral form of SnO2 is called cassiterite, and this is the main ore of tin. With many other names, this oxide of tin is an important material in tin chemistry. It is a colourless, diamagnetic, amphoteric solid. Structure Tin(IV) oxide crystallises with the rutile structure. As such the tin atoms are six coordinate and the oxygen atoms three coordinate. SnO2 is usually regarded as an oxygen-deficient n-type semiconductor. Hydrous forms of SnO2 have been described as stannic acid. Such materials appear to be hydrated particles of SnO2 where the composition reflects the particle size. Preparation Tin(IV) oxide occurs naturally. Synthetic tin(IV) oxide is produced by burning tin metal in air. Annual production is in the range of 10 kilotons. SnO2 is reduced industrially to the metal with carbon in a reverberatory furnace at 1200–1300 °C. Amphoterism Although SnO2 is insolubl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Titanium Dioxide
Titanium dioxide, also known as titanium(IV) oxide or titania , is the inorganic compound with the chemical formula . When used as a pigment, it is called titanium white, Pigment White 6 (PW6), or CI 77891. It is a white solid that is insoluble to water, although mineral forms can appear black. As a pigment, it has a wide range of applications, including paint, sunscreen, and food coloring. When used as a food coloring, it has E number E171. World production in 2014 exceeded 9 million tonnes. It has been estimated that titanium dioxide is used in two-thirds of all pigments, and pigments based on the oxide have been valued at a price of $13.2 billion. Structure In all three of its main dioxides, titanium exhibits octahedral geometry, being bonded to six oxide anions. The oxides in turn are bonded to three Ti centers. The overall crystal structure of rutile is tetragonal in symmetry whereas anatase and brookite are orthorhombic. The oxygen substructures are all slight distort ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Extended X-ray Absorption Fine Structure
Extended X-ray absorption fine structure (EXAFS), along with X-ray absorption near edge structure (XANES), is a subset of X-ray absorption spectroscopy (XAS). Like other absorption spectroscopies, XAS techniques follow Beer's law. The X-ray absorption coefficient of a material as a function of energy is obtained using X-rays of a narrow energy resolution are directed at a sample and the incident and transmitted x-ray intensity is recorded as the incident x-ray energy is incremented. When the incident x-ray energy matches the binding energy of an electron of an atom within the sample, the number of x-rays absorbed by the sample increases dramatically, causing a drop in the transmitted x-ray intensity. This results in an absorption edge. Every element has a set of unique absorption edges corresponding to different binding energies of its electrons, giving XAS element selectivity. XAS spectra are most often collected at synchrotrons because of the high intensity of synchrotron X- ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
X-ray Absorption Near Edge Structure
X-ray absorption near edge structure (XANES), also known as near edge X-ray absorption fine structure (NEXAFS), is a type of absorption spectroscopy that indicates the features in the X-ray absorption spectra ( XAS) of condensed matter due to the photoabsorption cross section for electronic transitions from an atomic core level to final states in the energy region of 50–100 eV above the selected atomic core level ionization energy, where the wavelength of the photoelectron is larger than the interatomic distance between the absorbing atom and its first neighbour atoms. Terminology Both XANES and NEXAFS are acceptable terms for the same technique. XANES name was invented in 1980 by Antonio Bianconi to indicate strong absorption peaks in X-ray absorption spectra in condensed matter due to multiple scattering resonances above the ionization energy. The name NEXAFS was introduced in 1983 by Jo Stohr and is synonymous with XANES, but is generally used when applied to surface and mol ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Scanning Tunneling Microscope
A scanning tunneling microscope (STM) is a type of microscope used for imaging surfaces at the atomic level. Its development in 1981 earned its inventors, Gerd Binnig and Heinrich Rohrer, then at IBM Zürich, the Nobel Prize in Physics in 1986. STM senses the surface by using an extremely sharp conducting tip that can distinguish features smaller than 0.1 nm with a 0.01 nm (10 pm) depth resolution. This means that individual atoms can routinely be imaged and manipulated. Most microscopes are built for use in ultra-high vacuum at temperatures approaching zero kelvin, but variants exist for studies in air, water and other environments, and for temperatures over 1000 °C. STM is based on the concept of quantum tunneling. When the tip is brought very near to the surface to be examined, a bias voltage applied between the two allows electrons to tunnel through the vacuum separating them. The resulting ''tunneling current'' is a function of the tip position, applied ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quantum Dot
Quantum dots (QDs) are semiconductor particles a few nanometres in size, having light, optical and electronics, electronic properties that differ from those of larger particles as a result of quantum mechanics. They are a central topic in nanotechnology. When the quantum dots are illuminated by UV light, an electron in the quantum dot can be excited to a state of higher energy. In the case of a semiconductor, semiconducting quantum dot, this process corresponds to the transition of an electron from the valence band to the conductance band. The excited electron can drop back into the valence band releasing its energy as light. This light emission (photoluminescence) is illustrated in the figure on the right. The color of that light depends on the energy difference between the conductance band and the valence band, or the transition between discrete energy states when band structure is no longer a good definition in QDs. In the language of materials science, nanoscale semiconductor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Manchester Evening News
The ''Manchester Evening News'' (''MEN'') is a regional daily newspaper covering Greater Manchester in North West England, founded in 1868. It is published Monday–Saturday; a Sunday edition, the ''MEN on Sunday'', was launched in February 2019. The newspaper is owned by Reach plc (formerly Trinity Mirror), /sup> one of Britain's largest newspaper publishing groups. Since adopting a 'digital-first' strategy in 2014, the ''MEN'' has experienced significant online growth, despite its average print daily circulation for the first half of 2021 falling to 22,107. In the 2018 British Regional Press Awards, it was named Newspaper of the Year and Website of the Year. History Formation and ''The Guardian'' ownership The ''Manchester Evening News'' was first published on 10 October 1868 by Mitchell Henry as part of his parliamentary election campaign, its first issue four pages long and costing a halfpenny. The newspaper was run from a small office on Brown Street, with approximately ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
4GLS
The 4GLS was a proposed 4th Generation Light Source, based at the Daresbury Laboratory in Cheshire, England, intended to combine energy recovery linac (ERL) and free electron laser technologies to provide synchronised sources of synchrotron radiation and free electron laser radiation covering the terahertz (THz) to soft X-ray regimes. In early 2008 the Science and Technology Facilities Council decided not to proceed with the 4GLS. See also * Diamond Light Source Diamond Light Source (or Diamond) is the UK's national synchrotron light source science facility located at the Harwell Science and Innovation Campus in Oxfordshire. Its purpose is to produce intense beams of light whose special characteristics ... References Free-electron lasers Science and Technology Facilities Council Synchrotron radiation facilities {{optics-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
