Mark Ratners Concepts of Molecular Electronics

Mark Ratners Concepts of Molecular Electronics Mark Ratner  and  The Basis of the Future: Molecular Electronics Levent BahadÄ ±rhan KarakuÃ…Å ¸ 2. Introduction Mark Ratner, He is professor of chemistry and professor of materials science and engineering at Northwestern University. He studies the theory of fundamental chemical processes related to nanoscale application. Ratner is a member of the Internatioanal Academy of Quantum Molecular Science also, His lectures subjects were â€Å"Transport in molecular Junctions†and â€Å"Nano and Energy† at Stanfort University at 2009. I choose Mark Ratner because, Topic of Nano technology and energy generation are important on the sustainable energy. High capaticy batteries, high technology solar cells, etc. besides; new tech-power plants or storages These topics to be studied for me. In short, Quantum mechanics and Nano technology are always interested me[20]. 2.1. Education He graduated from Harvard University department of chemistry at 1964. Then, He started Ph.D. in chemistry from Nortwestern University and working with G. Ludwig hofaker. Ratner first lecture chemistry at New York University from 1970 until 1974[20] 2.2. Career Development He worked may extended period of time in israel and he worked with lots of scientists, including form Tel Aviv University and University of Jesursalem. Also Rater works international association, particularly in Netherlands and Denmark[20] 3. Fields 3.1 Molecular Electronics (Primary field) Molecular electronics increased interest in as of late, induced spawning by information technology may reach it computability limits in a several years. [1-2]. In order to molecular electronics to become a valued alternative to silicon researces, It will not be enough to generated molecular electronic devices with distinguished characteristics, but proper circuit and architectural solution will be needed. When lots of effort has given to the demonstration of electronic functionalities of one molecules and organic filmsi research at the circuit and system level is still in its beginning[5-9]. Investigation on single molecules or nanotube based devices prospect to keep Moore’s law alive once miniaturisation of silicon-based structures becomes useless. As first proposed by Aviram and Ratner [10]. One can imagine to squeeze whole nonlinear circuit elements such as transistors or diodes into single molecules. In principle, suchlike devices could be importantly faster and smaller th an end of the routemap solid state electron devices[11]. 3.1.1 Why molecular electronics? Intrinsically entire electronic processes in nature, from photosynthesis to signal transduction, occur in molecular structures. For electronic epplications, molecular structure have four major advantages: Size: The size scale of molecules is between 1 and 100nm, a scale that permits functional nano-structures with attendant advantages in efficiency, cost and power dissipation. Assembly and recognition: One can exploit secific internolcular interaction to from structures with nano-scale self assembly. Molecular recognition can be used to chance electronic attitutde, providing both swithing and sensing capabilities on the one molecule scale. Dynamical stereochemistry: lots of molecules gave multiple distinct stable conformations or isomers. Such geometric isomers can gave distinct optical and electronic properties. For instance, the retinal one switches between more than one stable structures, a process that transduces light into a chemoelectrical pulse and allows vision. Synthetic tailorability: with choice of character and geometry, ona can extensively vary a transport of the molecule, binding, structural and optical properties. The instrument of molecular synthesis are extremely developed.[12] [http://www.nanowerk.com/nanotechnology/reports/reportpdf/report52.pdf] 3.1.2 Electrode The molecule electrode interface is a severely significant component of a molecular junction. It might limit current flow or completely modify the measured electrical response of the junction. Lots of experimental platforms for constructiong molecular electronic devices are founded on practical comsideration. This approach is in numerous ways the boon and the disaster of the field. For instance, the sulfur gold bond is a fabulous chemical hangle for forming self assembled, forceful organic monolayers on metal surfaces. Other technics such as using a scanning probe tip a cÄ ±ntact the molecule are frequently employed in part. Becuse that avoid processing steps that can damage or unexpecteably modify the molecular component. Optimally the couice of electrode materials would be based not on the easy of production or measurement, but rather on first principles considerations of molecule electrode interactions. On the other hand, in state of the art for the theory of molecule electrode interfaces is very elemantary. [http://www.nanowerk.com/nanotechnology/reports/reportpdf/report52.pdf] 3.1.3 DNA Consider a protein that spans a cell membrane and shuttles information across that membrane. The protein self assembles and self orients in the membrane; it also might switch between two forms, only one of that will transmit the chemicalsignal. Proteins are big molecues and indeed a specific molecular size is required to achieve such a rich combination of properties. The rotaxane molecule shown large and comples, but it is indeed efficiently and small designed, given the set of mechanical, chemical, and electronic properties that have been built into it[16]. Quite likely, transport in DNA junctions will show that the molecule or at least naturally occuring DNA is actually a wide bandgap semiconductor characterized by localized hole hopping between the low energy guanine cytosine pairs. Also guanin yields the most stable positive ion. Because the band gap is wide, DNA seems colourless and long range coherent charge motion is improbable[17]. 3.1.4 Circuit Architecture The potential of chemical synthesis to design specific and maybe even useful device behaviors is rapidly being realised. The following question, what sorts of circuit architectures can most take advantage of molecular electronics, is nowadays receiving rather a bit of attention both from computer scientists and from researchers; progress towerd indentifying and constructing working molecular electronics circutry has advanced fastly[13]. 3.1.5 The Future The primary challenges of realizing a true molecular electronics technology are wintry. Controlled fabriaction to within specified tolerances and its expermental verification is a exclusive problem. Self assembly schemes based on molecular recognition will be viral for that work. Absolutely reproducible measurments of junction conductance are only beginning in laboratories at Cornell, Harvard, Delft, Purdue and karlsruhe Universities and at the Naval research laboratory and same centers. A lot of the technology targets of molecular electronics, such as the computational applications duscussed, should perhaps be viewed as drivers for steering the field forward and for defining the critical and rate limiting challenges that must be overcome[14]. 3.2 Electron transport in molecular wire junctions Molecular conductance junction are structures in that unimolecules or minor groups of molecules conduct electrical current between one than one electrodes In such junctions, the linkage between the molecule and the electrodes very affects the current boltage characteristics. Considering theoretical and several experimental advances, including the understanding of basic systems, there is still limited correspondence between theoretical and experimental studies of these systems[18]. 3.3 Mesoscopic features of charge Generation in organic semiconductors Over the past twenty years, organic materials gave been extremly investigated by countless research groups for implementation in organic photo voltaic(OPV) devices. The organic semi conductors is protrusive by their potential low cost and facile tunability, making organic photovoltaic devices a knowledfe gap in our common understanding of materials, so boyh the time scale and lenght scale (fento to microsecond and nano to micrometer) proper to OPV functionality occupy a challenging a impressive space between the traditional regimes of quantum mechanics and solid state physics[19]. 4. Conclusion Ratner lead up lots of field, research centre and laboratories foremost; International Business Machines (IBM) and The defense Advanced Research Projects Agency (DARPA). Also, He described his experiences as an organizing member; a member of the board of directors and being on steering and selectrion committee. The significance of gaving a staff at research centre and proposal some thoughts on the future nanotechnology. Once for all, Ratner have a part in many today’s technology References [1] J. R. Heath and M. A. Ratner, Physics Today 56, 43 (2003) [2] J. R. Reimers, C. A. Picconnatto, J. C. Ellenbogen, and R. Shashidhar (eds.), Ann. New York Acad. Sci. 1006 (2003) [5] J. R. Heath, P. J. Kuekes, G. S. Snider and R. S. Williams, Science 280, 1716 (1998) [6] Y. Wada, Proc. IEEE 89, 8 (2001) [7] J. M. Tour, W. L. Zandt, C. P. Husband, S. M. Husband, L. S. Wilson, P. D. Franzon and D. P. Nackashi, IEEE Trans. Nanotech, 1, 2 (2002) [8] M. Macucci, G. Iannacone, L. Bonci and M. Girlanda, IEE Proc. Circuits Devices Syst. 151, 5 (2004) [9] A. Chaudhary, D. Z. Chen, X. S. Hu, M. T. Niemeier, R. Ravichandran and K. Whitton, IEEE Trans Comp. Aided Des. Int. Cir. Sys. 26, 11 (2007) [10] A. Aviram and M. A. Ratner, Chem. Phys. Lett., 29, 277 (1974) [11] J. C. Ellenbogen and J. C. Love, Proceedings IEEE 88 (3), 386 (2000) [12] Thomas Bjà ¸rnholm References:Tue Hassenkam, Kasper Moth-oulsen, Nicolai Stuhr-Hansen, Kasper Nà ¸rgaard, M. S. Kabir, and Thomas Bjà ¸rnholm. Self-Assembly and Conductive Properties of Molecularly Linked Gold Nanowires. Nano Letters, 4 (1), 19 -22, 2004. [13]. A. J. Heinrich et al., Science 298, 1381 (2002). [13] A. Bachtold, P. Hadley, T. Nakanishi, C. Dekker, Science 294, 1317 (2001); Y. Huang, Science 294, 1313 (2001); P. Avouris et al., Physica B 323, 6 (2002); Y. Chen et al., Nanotechnology 14, 462 (2003). [14] A. DeHon, in Proc. First Workshop on Non-Silicon Computation, available at http://www.cs.caltech.edu/research/ic/ pdf/molecular_nsc2002.pdf [15] P. J. Kuekes, R. S. Williams, â€Å"Demultiplexer for a Molecular Wire Crossbar Network,† US Patent 6,256,767 (3 July 2001) [16] A. J. Heinrich et al., Science 298, 1381 (2002). [17] D. Porath, A. Bezryadin, S. de Vries, C. Dekker, Nature 403, 635 (2000). [18] Nitzan, A, Ratner, M 2003, Electron Transport in Molecular Wire Junctions, Science, 5624, p. 1384, JSTOR Journals, EBSCOhost, viewed 7 May 2015. [19] Savoie, B, Jackson, N, Chen, L, Marks, T, Ratner, M 2014, Mesoscopic features of charge generation in organic semiconductors, Accounts Of Chemical Research, 47, 11, p. 3385-3394, Scopus ®, EBSCOhost, viewed 7 May 2015. [20] Cao, M, Deng, L, Xu, H 2015, Study of PNA-DNA hybridization by AFM-based single-molecule force spectroscopy, Colloids And Surfaces A: Physicochemical And Engineering Aspects, 470, p. 46-51, Scopus ®, EBSCOhost, viewed 7 May 2015.

Threatening Forces

Threatening forces are every where we look in life. Almost anything could be considered a threat in today s society. The poem by James Joyce, I hear an Army Charging Upon the Land, contains evidence of a threatening force. The threatening force in this poem is punk rock kids at a punk rock show. Threatening forces are very apparent in this poem. A prime example of one is when he says Arrogant, in black armor. He is talking about kids in leather jackets. It is there way of proving they are punk and it looks threatening. Seeing people in leather jackets is scary, especially when society has trained us to think that black is a sign of. We have been trained to think that anything that stands out is scary and people in black leather jackets stick out like a sore thumb. Obviously, when James Joyce says in black armor, it is a threatening force of punk rock. Punk rock is a very firm theme of this poem that is supposed to be menacing. This is established when it says, Clanging, Clanging upon the heart as upon an anvil. This is saying how he feels that the chains that the kids wear are frightening. He feels that the sound of their chains dangling together is intimidating. When people who wear chains run the often make a loud noise and if you wear more than one, which most people do, it makes an extremely loud noise which can be demoralizing. Clearly, the sound of the chains clanging together is a threatening sound. The people who listen to punk rock music are a reoccurring theme of peril. The threatening force of punk rock is extravagant when James Joyce says; They come out of the sea and run shouting by the shore. This is talking about them after a concert and how they are rowdy. Them coming out of the sea is when they come out of the mosh pit, out of the sea of people. After this they are often rowdy with the little energy they have left over. They are talking loudly because their hearing was just blasted by the loud music. People who are in a really good mood and acting a bit rowdy are often seemed to be dangerous especially if they are yelling. Evidently, punks after a concert are considered a threatening force to society. The poem, I Hear an Army Charging Upon the Land, is about the threat that punk rock supposedly puts on our society. Society is chained to its belief that anything different is threatening. Even though most of these people are not the least bit scary. It is hard to believe that, when the leaders of society, like the police, are always blaming the problem of on these types of people. Is punk rock really a threatening force in society or just a way that we have been brain washed to fear change and difference?

Individual Lesson Plan: Life Cycle of a Butterfly Essay

Introduction: In this lesson, 2nd grade students will participate in a class on the life cycle of a butterfly. Students will learn standards-aligned science concepts and also benefit from cross-curricular instruction, through the incorporation of reading, writing, and hands-on activities. These modalities will be used to help students understand the concept of the life cycle and make real-life connections to the human life cycle. The lesson will last for approximately forty-five minutes. The lesson will be taught within a small suburban school of approximately 650 students, ranging from kindergarten to 5th grade. The school currently is receiving Title 1 funds, with 70% of its students on free or reduced breakfast and lunch. The school is currently in good standing and has met AYP for the past two years. There are a total of 20 students in the class, which displays the following demographics: 50% Caucasian, 20% African-American, 20% Hispanic and 10% Asian. The class distribution includes 12 boys and 8 girls, and a total of 5 ELLs. Two students have an active IEP, and five students have been identified as gifted and talented. The language level of the students is classified as the elementary or intermediate level of English language proficiency. Description of Lesson: Lesson: Butterfly Life Cycle Time Allotment: This lesson will be taught in one forty-five minute class period. Content Objectives: By the completion of this lesson students will meet two objectives. Students will be able to identify the four life cycle stages of a butterfly. Also, all students will be able to list the stages of the butterfly life cycle in order. Language Objectives: The second grade students will also meet two language objectives by the end of this lesson. Students will identify the Greek roots of certain vocabulary words. Students will also define the term â€Å"compound words†. State Standards: The student will investigate and understand that plants and animals undergo a series of orderly changes as they mature and grow. (Grade two content science standards, 2007). Key Vocabulary: In this lesson students will become familiar with a variety of key vocabulary words to include the following: Oval egg, caterpillar, larva, metamorphosis, chrysalis, pupa, imago, forewing, wingtip, hindwing, margin, abdomen, thorax, proboscis, antennae, and wing base. Materials: Students will use several materials in order to complete this lesson, which are listed as the following: paper bag, small plastic representations of butterfly stages to put in paper bag, KWL graphic organizer, computer stations with internet access for ESL students, clay, utensils to carve into clay, Greek root/compound word identification assessment sheet, life cycle stage and body part labeling assessment sheet. SIOP Features: This lesson will utilize the following SIOP features: ————————————————- SIOP Features: ————————————————- PreparationScaffoldingGrouping Options ————————————————- ___ Adaptation of Content_X_ ModelingX Whole Class ————————————————- _X_ Links to Background___ Guided practice___ Small Group ————————————————- _X_Links to Past Learning___ Independent PracticeX Partners ————————————————- ___ Strategies Incorporated_X_ Comprehensible Input___ Independent ————————————————- ————————————————- This lesson begins by drawing on information students have recently learned in previous lessons about shapes and textures as well as student background knowledge about butterflies, the focus of this lesson. Before the students arrive in the classroom, the teacher will place small plastic representations of butterflies in a paper bag; a total of 4 models representing the four life stages of butterflies will be placed in the bag. When the students arrive, the instructor should begin with the following exercise, which is designed to capture student interest and highlight key vocabulary words in a â€Å"kid-friendly† manner in order to increase comprehensible input. The instructor should close the bag and shake it, after which students should take turns putting their hands in the bag to feel the models. The teacher should ask the students to describe the shape and texture of what they feel, offering the options of â€Å"square†, â€Å"oval†, triangular†, â€Å"rod-shaped†, â€Å"smooth†, â€Å"rough†, and â€Å"fuzzy†, for example. The teacher should remind the students of the definitions of these words and ask the students to guess what they are feeling in the bag, writing all the guesses on the board. Once all students have had a turn, the instructor will reveal the models and explain that they represent the different life stages of a butterfly, emphasizing how the organism takes on different forms and textures depending on the stage it is in. The instructor will then engage the students in a 3-minute whole class discussion about their experience with butterflies, after which he should present the content and language objectives for this lesson. Lesson Focus: The teacher will present a KWL graphic organizer on the white board, explain that it will be used to help understand the literature on butterflies that they will soon read, and then model how it should be completed, using the teacher’s own background knowledge about butterflies. The sample graphic organizer should remain on the board to be used as a reference while students complete their own sheets. Guided Practice: The teacher will lead the class to the computer lab, KWL charts in hand, and pair students in heterogeneous strong language/low language couples before instructing them to log onto the www.kidsbutterfly.org website. The instructor should walk around the room, observing student progress and giving extra help to pairs with ELL’s who might be struggling to gain understanding from the website or completing the KWL chart. ELL students who seem to be having great difficulty reading should be shown how to read the literature in their native language if it is one of the options. After the reading, students will return to the classroom where the teacher will lead a grand discussion on the vocabulary words that students encountered, giving a mini-lesson on compound words when reviewing the terms â€Å"wingtip†, â€Å"hindwing†, and â€Å"forewing† and a mini-lesson on words with Greek roots and their root definitions when reviewing the terms â€Å"metamorphosis† and â€Å"chrysalis.† For the purpose of engaging ELL students whose native language is Latin-based, the teacher should explain how many English cognates, alternatives to more colloquial terms, are very similar to the counterparts in the ELL’s first language, giving the example of the word â€Å"calculate† as opposed to the term â€Å"figure out†. Independent Practice: The teacher will explain that the class will now do individual projects involving the creation of butterfly models. The teacher should show completed clay models of the four stages of a butterfly life cycle and then demonstrate, using new clay and carving utensils, how to create a butterfly in its final stage so students understand the desired size and extent of detail. The instructor should then post pictures of the butterfly stages on a readily visible board and distribute the materials to students (clay and carving utensils). The teacher will then walk through the room, aiding students as necessary in the creation of their models. Review/Assessment: After creating the models, the students will be assessed to determine if they have achieved the content and language objectives. Individually, the students will complete a multiple choice test assessing their ability to identify compound words and the definition of â€Å"metamorphosis† and â€Å"chrysalis† as well as a sheet on which the student will be required to label the life cycle stages and the body parts of a butterfly. Students should spend no more than 10 minutes on both assessments, but ESL’s will be given an extra five minutes to complete them. Students will receive a percentage score on both assessments and must receive at least an 85% on either test to demonstrate mastery of the material. Conclusion: At the conclusion of this lesson, students will be able to identify the various stages of the life cycles of a butterfly. Students will also understand that all living things have a life cycle, and specific attributes of the life cycle stages vary from one species to the next. This lesson utilizes not only content-based instruction but also sheltered instruction, which helps to promote English language proficiency, in part by rendering the information being presented more readily comprehensible. It is designed to educate English language learners, as well as the general student population. According to Echevarria, Vogt, and Short (2008), â€Å"ELLs must pull together their emerging knowledge of the English language with the content knowledge they are studying in order to complete the academic task† (p. 6). Throughout the lesson, students will learn science concepts and also benefit from cross-curricular instruction through the incorporation of reading and writing into the lesson. As an extension activity, students will take a field trip to the Museum of Science, where they will be able to see the similarities and differences between various species’ life cycles, including egg development, plant growth, and metamorphosis. Students will then participate in a post-test life cycle activity, to reinforce learned concepts, and address any gaps in comprehension. References Common Wealth of Virginia Board of Education. (n.d.). English standards of learning. Retrieved from http://www.doe.virginia.gov/testing/sol/standards_docs/english/stdsk-8/stds_english2.pdf Commonwealth of Virginia Board of Education. (2003). Science standards of learning curriculum framework . Retrieved from http://www.doe.virginia.gov/testing/sol/frameworks/science_framewks/framework_science2.pdf Echevarria, J., Vogt, M., & Short, D. (2008). Making content comprehensible for English learners: The SIOP ® model (3rd ed.). Boston, MA: Allyn and Bacon. The Children’s Butterfly Site. (n.d.). Retrieved from http://www.kidsbutterfly.org/

The Debate of Banning Smoking in Public Places Essays

The Debate of Banning Smoking in Public Places â€Å"There is no difference between a smoker and a suicide, only that one takes longer to kill themselves than the other†. Everyone has their rights, and if you want to smoke or not should be your choice because you are doing the damage to your own body. But if it’s supposed to be your choice and every gets their own choice then when you smoke in public places or wherever anyone is around you, you are making that choice for them and damaging their body not just yours. Is this unfair? Throughout this essay I will discuss the pros and cons of smoking and smoking in public places and discuss how smoking affects you and others around you. Most people†¦show more content†¦Also a great deal of smoker complain of ‘smokers cough’. This is due to our bodies way of trying to get rid of the tar that has settled in the bronchial tubes, by producing extra mucus to clean the lungs. So if smoking is proved to cause all these health hazards and repulsive things then why do people, including the young, smoke? Tobacco first arrived in the 16th century, and many Europeans started to smoke as they believed tobacco contained medicine, which was good for their health. Today it is well known that the opposite is true and the reason so many people may hate smoking but cant give up is because cigarettes contain a chemical called nicotine. Nicotine gives a person many good feelings, these feelings you get are what draw you back for another cigarette. Nicotine causes rapid relief of adrenaline which feels good and it’s effects are: * Rapid heartbeat * Increased blood pressure * Rapid, shallow breathing It also makes you eat less and some people find this a good thing but it is definitely not. It causes you to think that you have no sugar unlike the weight loss caused by exercising, this makes you have high cholesterol and damages arteries this causes heart attacks. 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