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1

Cross-Connections of Chemistry  

NASA Astrophysics Data System (ADS)

We are in desperate need of qualified chemistry teachers. Are the teachers who have biology, physics, or some psychology degrees qualified to teach chemistry? Have they taken enough chemistry to be prepared to teach outside their degree field? If remediation is necessary, what courses should be required? Attracting pre-service science teachers to the study of pure chemistry is not an easy task when more attractive course offerings are available. Maybe we should concentrate on cross-training in-service teachers by providing appropriate graduate courses to encourage them and bring them into the family. Many teachers with degrees outside the traditional discipline of chemistry have adequate backgrounds in the applications of chemistry. Requiring hours of undergraduate education before they enter the hallowed halls of the chemistry building as graduate students only serves to discourage a large segment of in-service teachers who wish to broaden their perspective. The National Science Education Standards make a compelling argument for connecting and integrating science courses for practicing teachers (3). We are at the crossroads. At a time when we so desperately need qualified chemistry teachers, shouldn't we be more open in our graduate teaching programs, inviting those with degrees in other disciplines to start on a graduate degree without insisting on undergraduate or survey coursework first? Many potential chemical education graduate students have a background in chemistry--it is just known by another name.

Mason, Diana S.

2002-02-01

2

Connected Chemistry—Incorporating Interactive Simulations into the Chemistry Classroom  

Microsoft Academic Search

The aim of this paper is to describe a novel modeling and simulation package, connected chemistry, and assess its impact on students' understanding of chemistry. Connected chemistry was implemented inside the NetLogo modeling environment. Its design goal is to present a variety of chemistry concepts from the perspective of “emergent phenomena”—that is, how macro-level patterns in chemistry result from the

Mike Stieff; Uri Wilensky

2003-01-01

3

Connected Chemistry—Incorporating Interactive Simulations into the Chemistry Classroom  

Microsoft Academic Search

The aim of this paper is to describe a novel modeling and simulation package, connected chemistry, and assess its impact on students' understanding of chemistry. Connected chem- istry was implemented inside the NetLogo modeling environment. Its design goal is to present a variety of chemistry concepts from the perspective of \\

Mike Stieff; Uri Wilensky

2003-01-01

4

Connected Chemistry--Incorporating Interactive Simulations into the Chemistry Classroom.  

ERIC Educational Resources Information Center

Describes a novel modeling and simulation package and assesses its impact on students' understanding of chemistry. Connected Chemistry was implemented inside the NetLogo modeling environment. Using Connected Chemistry, students employed problem -solving techniques characterized by stronger attempts at conceptual understanding and logical…

Stieff, Mike; Wilensky, Uri

2003-01-01

5

Crossing Levels and Representations: The Connected Chemistry (CC1) Curriculum  

ERIC Educational Resources Information Center

Connected Chemistry (named CC1 to denote Connected Chemistry Chapter 1) is a computer-based environment for learning the topics of gas laws and kinetic molecular theory in chemistry. It views chemistry from an "emergent" perspective, how macroscopic phenomena result from the interaction of many submicroscopic particles. Connected Chemistry employs…

Levy, Sharona T.; Wilensky, Uri

2009-01-01

6

Crossing Levels and Representations: The Connected Chemistry (CC1) Curriculum  

Microsoft Academic Search

Connected Chemistry (named CC1 to denote Connected Chemistry Chapter 1) is a computer-based environment for learning the topics\\u000a of gas laws and kinetic molecular theory in chemistry. It views chemistry from an “emergent” perspective, how macroscopic\\u000a phenomena result from the interaction of many submicroscopic particles. Connected Chemistry employs agent-based models built\\u000a in NetLogo (Wilensky, NetLogo, Northwestern University, Evanston, 1999a), embedded

Sharona T. Levy; Uri Wilensky

2009-01-01

7

Connected Chemistry - A study of secondary students using agent-based models to learn Chemistry  

Microsoft Academic Search

ABSTRACT As part of the MAC (Modeling Across the Curriculum) project, we are engaged in iterative software and curriculum design of Connected Chemistry, (Levy, Bruozas & Wilensky, 2003; Stieff & Wilensky, 2003), a modeling and simulation package designed to help secondary and undergraduate,students,learn chemistry. Connected,Chemistry,is implemented,in the NetLogo (Wilensky, 1999) agent-based modeling environment and enables students to come to see

Sharona T. Levy; Hyungsin Kim; Uri Wilensky

8

Crossing Levels and Representations: The Connected Chemistry (CC1) Curriculum  

NASA Astrophysics Data System (ADS)

Connected Chemistry (named CC1 to denote Connected Chemistry Chapter 1) is a computer-based environment for learning the topics of gas laws and kinetic molecular theory in chemistry. It views chemistry from an "emergent" perspective, how macroscopic phenomena result from the interaction of many submicroscopic particles. Connected Chemistry employs agent-based models built in NetLogo (Wilensky, NetLogo, Northwestern University, Evanston, 1999a), embedded in scripts that structure and log the students' activities. A conceptual framework was developed to structure students' experiences and learning through exploring the models. The framework describes three spheres of knowledge (conceptual, symbolic and physical) and four forms of access to understanding the system (submicro, macro, mathematical and experiential). Activities were designed to help students build an integrated view of the chemical system, by focusing on understanding within each form of access, and promoting transitions between the spheres of knowledge. The macro-level descriptions were used to bridge between the three spheres and support these shifts. The conceptual framework for the Connected Chemistry curriculum is discussed and demonstrated. Further development directions are suggested.

Levy, Sharona T.; Wilensky, Uri

2009-06-01

9

Astrobiology and green chemistry: a new pedagogical connection  

NASA Astrophysics Data System (ADS)

Various pedagogical approaches are needed to introduce astrobiology into the chemistry curriculum. We are developing a new approach in which we connect green chemistry with astrobiology. Green chemistry is chemistry which is environmentally friendly. One obvious way for the organic chemistry to be environmentally friendly is to use water as solvent, instead of more toxic organic solvents. Another approach is to run so-called solventless reactions. For example, as the solid materials are mixed together, the melting point of the mixture is lower than the melting points of its individual components (the principle of the mixed-melting point). In some cases the entire mixture may melt upon mixing. The reactions would then occur in a viscous semi-solid state. An additional approach is to run the reactions by utilizing enzymes or man-made protein mimics as catalysts instead of toxic catalysts, such as those based on the transition metals. These and some other known examples of green chemistry have a great potential for astrobiology. The astrobiological reactions typically occur in water (e.g. prebiotic soup), in the solid mixtures (e.g. on the meteors), and may be catalyzed by various short peptides. The connection between the green chemistry principles and astrobiology represents a new pedagogical approach for infusion of astrobiology into the organic chemistry.

Kolb, Vera M.

2009-08-01

10

The dual dust chemistry - binarity connection  

E-print Network

Accumulating evidence points to a binary nature for the Wolf-Rayet ([WC]) central stars, a group that constitutes about 15% of all central stars of planetary nebula. From ISO observations, a dual dust chemistry (oxygen- and carbon-rich) has been shown to be almost exclusively associated with [WC] central stars, a fact that could be explained by O-rich dust residing in a disk, while the C-rich dust being more widely distributes. HST/STIS space resolved spectroscopy of the [WC10] central star CPD-568032, is interpreted as revealing a dust disk or torus around the central star. This, together with CPD-568032's variable lightcurve is taken as an indirect indication of binarity. Finally, we present here, for the first time, preliminary results from a radial velocity survey of central stars. Out of 18 stars with excellent data at least 8 are radial velocity variables. If these turn out to be binaries, it is likely that the central star binary fraction is as high as about 50%.

Orsola De Marco; A. F. Jones; M. J. Barlow; M. Cohen

2003-09-29

11

Students' foraging through the complexities of the particulate world in the Connected Chemistry (MAC) curriculum  

E-print Network

. The Connected Chemistry curriculum focuses on topics in chemistry and employs multi-agent NetLogo models & Wilensky, 2005) focuses on topics in chemistry and employs multi-agent NetLogo models (Wilensky, 1999

Wilensky, Uri

12

Students' Learning with the Connected Chemistry (CC1) Curriculum: Navigating the Complexities of the Particulate World  

ERIC Educational Resources Information Center

The focus of this study is students' learning with a Connected Chemistry unit, CC1 (denotes Connected Chemistry, chapter 1), a computer-based environment for learning the topics of gas laws and kinetic molecular theory in chemistry (Levy and Wilensky 2009). An investigation was conducted into high-school students' learning with Connected

Levy, Sharona T.; Wilensky, Uri

2009-01-01

13

EDITORIAL: Ice in the environment: connections to atmospheric chemistry Ice in the environment: connections to atmospheric chemistry  

NASA Astrophysics Data System (ADS)

Ice in the environment, whether in the form of ice particles in clouds or sea ice and snow at the Earth's surface, has a profound influence on atmospheric composition and climate. The interaction of trace atmospheric gases with snow and sea ice surfaces largely controls atmospheric composition in polar regions. The heterogeneous chemistry of ice particles in clouds also plays critical roles in polar stratospheric ozone depletion and in tropospheric chemistry. A quantitative physical understanding of the interactions of snow and ice with trace gases is critical for predicting the effects of climate change on atmospheric composition, for the interpretation of ice core chemical records, and for modeling atmospheric chemistry. The motivation behind this focus issue of Environmental Research Letters (ERL), and the special session at the Fall 2007 meeting of the American Geophysical Union that generated it, was to enhance communication and interactions among field and laboratory scientists and modelers working in this area. Members of these three groups are each working toward a mutual goal of understanding and quantifying the connections between the chemistry of snow and ice in the environment and atmospheric composition, and communication and collaboration across these traditional disciplinary boundaries pose a challenge for the community. We are pleased to present new work from several current leaders in the field and laboratory communities in this focus issue. Topics include the interaction of organics and mercury with snow and ice surfaces, halogen activation from halide ice, and the emissions of reactive nitrogen oxides from snow. Novel experimental techniques are presented that make progress towards overcoming the experimental challenges of quantifying the chemistry of realistic snow samples and ice chemistry at temperatures relevant to the polar boundary layer. Several of the papers in this issue also touch on one of the significant gaps in our current understanding of the atmospheric chemistry of ice: the role of a quasi-liquid layer (QLL) or quasi-brine layer (QBL) at the ice surface. The studies presented here advance our understanding of the complex interactions of snow and ice with important reactive components in our atmosphere. It has become clear in recent years that the polar regions do not act as an ultimate sink for many compounds—the release of halogens and reactive nitrogen oxides from ice and snow are examples of this. Two notable implications arise from these findings (i) the impact of anthropogenic pollutants in our environment may extend further than we fully appreciate with current global atmospheric chemistry models and (ii) our interpretation of chemical records in ice cores requires that we fundamentally understand and quantify air-snow and air-ice interactions. Additionally, laboratory studies are elucidating the details of heterogeneous reactions that are prevalent on ice and snow surfaces throughout the troposphere, and we are poised to make significant strides in the near future quantifying these effects on regional and global scales. We look forward to continued progress in this field in the coming years, and we will continue to work to connect those conducting modeling, field and laboratory studies. Focus on Connections between Atmospheric Chemistry and Snow and Ice Contents HONO emissions from snow surfaces Harry Beine, Agustín J Colussi, Antonio Amoroso, Giulio Esposito, Mauro Montagnoli and Michael R Hoffmann Heterogeneous ozonation kinetics of phenanthrene at the air-ice interface T F Kahan and D J Donaldson Release of gas-phase halogens from sodium halide substrates: heterogeneous oxidation of frozen solutions and desiccated salts by hydroxyl radicals S J Sjostedt and J P D Abbatt Uptake of acetone, ethanol and benzene to snow and ice: effects of surface area and temperature J P D Abbatt, T Bartels-Rausch, M Ullerstam and T J Ye Interaction of gaseous elemental mercury with snow surfaces: laboratory investigation Thorsten Bartels-Rausch, Thomas Huthwelker, Martin Jöri, Heinz W Gägge

McNeill, V. Faye; Hastings, Meredith G.

2008-12-01

14

Connecting Acids and Bases with Encapsulation... and Chemistry with Nanotechnology  

ERIC Educational Resources Information Center

The features and the development of various new acids and bases activity sets that combines chemistry with nanotechnology are being described. These sets lead to the generation of many nanotechnology-based pharmaceuticals for the treatment of various diseases.

Criswell, Brett

2007-01-01

15

MAC Connected Chemistry AERA 07 How do I get there... straight, oscillate or inch?  

E-print Network

. The Connected Chemistry curriculum focuses on topics in chemistry and employs multi-agent NetLogo models in the system. The multi-agent NetLogo models are embedded within a PedagogicaTM (Horwitz & Burke, 2002) script. This integration of NetLogo and Pedagogica targets several goals, serving curriculum designers, students, as well

Wilensky, Uri

16

Enriching Learning for First Year Chemistry Students: Introduction of Adobe Connect  

ERIC Educational Resources Information Center

The study of chemistry is central within science and other associated degrees. At the University of New England in Armidale academics need to provide chemistry teaching in both a distance and the traditional on-campus mode within science and other degrees. This study explores the contribution that the adoption of Adobe Connect technology can make…

Smith, Erica; Lye, Peter; Greatrex, Ben; Taylor, Michelle; Stupans, Ieva

2013-01-01

17

Interfacial Soil Chemistry of Radionuclides in the Unsaturated Zone  

SciTech Connect

We are in the final year (in a one-year extension) of a project with the principal goal of investigating the impact of clay surface alteration, resulting from hydroxy-aluminum (HyA) and hydroxyaluminosilicate (HAS) species intercalation on reactivity of soils towards Cs and Sr. Special emphasis has been accorded to the unique geochemical conditions that are representative of the Hanford site vadose zone (high ionic strength, high pH, high Al concentrations). Specific objectives of the research include: (1) Quantify the rate and extent of contaminant sorption to prevalent soil minerals as a function of system composition and contaminant concentration. (2) Determine the effects of intercalation of clays by HyA and HAS on the sorption/ion exchange process. (3) Determine the role of NOM (dissolved and mineral bound) on the particle retention of Cs and Sr. (4) Investigate the nature of mineral transformations induced by high pH and ionic strength conditions characteristic of waste impacted environments as it affects concurrent/subsequent retention of Cs and Sr. (5) Determine the coordination chemistry of contaminants bound into clay surfaces [as measured in objectives (1)-(4)] using NMR and X-ray absorption spectroscopy (XAS). Significant progress has been made in achieving these objectives. We have conducted long-term kinetic studies--reaction times ranging from 1 to 370 d--to examine relationships between aluminosilicate weathering in the presence of synthetic tank waste leachate (STWL) and Cs/Sr uptake and release. Our experiments employ a sequence of specimen clay minerals including illite, vermiculite, smectite and kaolinite, which are also important reactive solids in the Hanford sediments (Serne et al., 2001). Parallel studies have been conducted with three representative Hanford sediment samples.

Chorover, Jon; Mueller, Karl T.; Karthikeyan, K. G.; Vairavamurthy, A.; Serne, R. Jeff

2002-06-01

18

Interfacial Soil Chemistry of Radionuclides in the Unsaturated Zone  

SciTech Connect

This is the final year (in a one-year extension) of a project with the principal goal of investigating the impact of clay surface alteration, resulting from hydroxy-aluminum (HyA) and hydroxyaluminosilicate (HAS) species intercalation on reactivity of soils towards Cs and Sr. Special emphasis has been accorded to the unique geochemical conditions that are representative of the Hanford site vadose zone (high ionic strength, high pH, high Al concentrations). Specific objectives of the research include: (1) Quantify the rate and extent of contaminant sorption to prevalent soil minerals as a function of system composition and contaminant concentration. (2) Determine the effects of intercalation of clays by HyA and HAS on the sorption/ion exchange process. (3) Determine the role of NOM (dissolved and mineral bound) on the particle retention of Cs and Sr. (4) Investigate the nature of mineral transformations induced by high pH and ionic strength conditions characteristic of waste impacted environments as it affects concurrent/subsequent retention of Cs and Sr. (5) Determine the coordination chemistry of contaminants bound into clay surfaces [as measured in objectives (1)-(4)] using NMR and X-ray absorption spectroscopy (XAS). Significant progress has been made in achieving these objectives. We have conducted long-term kinetic studies--reaction times ranging from 1 d to 2 yr--to examine relationships between aluminosilicate weathering in the presence of synthetic tank waste leachate (STWL) and Cs/Sr uptake and release. Our experiments employ a sequence of specimen clay minerals including illite, vermiculite, smectite and kaolinite, which are also important reactive solids in the Hanford sediments (Serne et al., 2001).

Chorover, Jon; Mueller, Karl T.; Karthikeyan, K. G.; Vairavamurthy, A.; Serne, R. Jeff

2003-06-01

19

Identifying fracture-zone geometry using simulated annealing and hydraulic-connection data  

USGS Publications Warehouse

A new approach is presented to condition geostatistical simulation of high-permeability zones in fractured rock to hydraulic-connection data. A simulated-annealing algorithm generates three-dimensional (3-D) realizations conditioned to borehole data, inferred hydraulic connections between packer-isolated borehole intervals, and an indicator (fracture zone or background-K bedrock) variogram model of spatial variability. We apply the method to data from the U.S. Geological Survey Mirror Lake Site in New Hampshire, where connected high-permeability fracture zones exert a strong control on fluid flow at the hundred-meter scale. Single-well hydraulic-packer tests indicate where permeable fracture zones intersect boreholes, and multiple-well pumping tests indicate the degree of hydraulic connection between boreholes. Borehole intervals connected by a fracture zone exhibit similar hydraulic responses, whereas intervals not connected by a fracture zone exhibit different responses. Our approach yields valuable insights into the 3-D geometry of fracture zones at Mirror Lake. Statistical analysis of the realizations yields maps of the probabilities of intersecting specific fracture zones with additional wells. Inverse flow modeling based on the assumption of equivalent porous media is used to estimate hydraulic conductivity and specific storage and to identify those fracture-zone geometries that are consistent with hydraulic test data.

Day-Lewis, F. D.; Hsieh, P. A.; Gorelick, S. M.

2000-01-01

20

Fault zone connectivity: slip rates on faults in the san francisco bay area, california.  

PubMed

The slip rate of a fault segment is related to the length of the fault zone of which it is part. In turn, the slip rate of a fault zone is related to its connectivity with adjoining or contiguous fault zones. The observed variation in slip rate on fault segments in the San Francisco Bay area in California is consistent with connectivity between the Hayward, Calaveras, and San Andreas fault zones. Slip rates on the southern Hayward fault taper northward from a maximum of more than 10 millimeters per year and are sensitive to the active length of the Maacama fault. PMID:17835127

Bilham, R; Bodin, P

1992-10-01

21

COLLABORATION: INTERFACIAL SOIL CHEMISTRY OF RADIONUCLIDES IN THE UNSATURATED ZONE  

EPA Science Inventory

Mobility of radionuclides (Cs+, Sr2+) in the vadose zone is controlled by sorptive interactions with natural soil particles. Weathering of silicates and intercalation of clay minerals with hydroxy -aluminum and -aluminosilicate species under the intense geochemical conditions in...

22

THE MAGNETIC CONNECTION BETWEEN THE CONVECTION ZONE AND CORONA IN THE QUIET SUN  

E-print Network

THE MAGNETIC CONNECTION BETWEEN THE CONVECTION ZONE AND CORONA IN THE QUIET SUN W. P. Abbett Space connection between the convectively unstable layers below the visible surface of the Sun and the overlying application of this numerical model, we present a series of simulations of the quiet Sun in a domain

Abbett, Bill

23

Connecting Solubility, Equilibrium, and Periodicity in a Green, Inquiry Experiment for the General Chemistry Laboratory  

ERIC Educational Resources Information Center

We present a novel first-year chemistry laboratory experiment that connects solubility, equilibrium, and chemical periodicity concepts. It employs a unique format that asks students to replicate experiments described in different sample lab reports, each lacking some essential information, rather than follow a scripted procedure. This structure is…

Cacciatore, Kristen L.; Amado, Jose; Evans, Jason J.; Sevian, Hannah

2008-01-01

24

Interfacial Soil Chemistry of Radionuclides in the Unsaturated Zone  

Microsoft Academic Search

This is the final year (in a one-year extension) of a project with the principal goal of investigating the impact of clay surface alteration, resulting from hydroxy-aluminum (HyA) and hydroxyaluminosilicate (HAS) species intercalation on reactivity of soils towards Cs and Sr. Special emphasis has been accorded to the unique geochemical conditions that are representative of the Hanford site vadose zone

Jon Chorover; Karl T. Mueller; K. G. Karthikeyan; A. Vairavamurthy; R. Jeff Serne

2003-01-01

25

Collboration: Interfacial Soil Chemistry of Radionuclides in the Unsaturated Zone  

SciTech Connect

The principal goal of this project was to assess the molecular nature and stability of radionuclide immoblization during weathering reactions in bulk Hanford sediments and their high surface area clay mineral constituents. We focused on the unique aqueous geochemical conditions that are representative of waste-impacted locations in the Hanford site vadose zone; high ionic strength, high pH and high Al concentrations. The specific objectives of the work were to measure the coupling of clay mineral weathering and contaminant uptake kinetics of Cs, Sr and I; determine the molecular structure of contaminant binding sites and their change with weathering time during and after exposure to synthetic tank waste leachate; establish the stability of neoformed weathering products and their sequestered contaminbants upon exposure of the solids to more natural soil solutaions afer remofal of the caustic waste source; and integrate macroscopic, microscopic and spectroscopic data to distinguish labile from non-labile contaminant binding environments, including their dependence on system composition and weathering time.

Karl T. Mueller; Don Chorover; Peggy O'Day; R. Jeff Serne; Garry Crosson; Geoffrey Bowers; Nelson Rivera

2006-12-11

26

Carbonate chemistry of the wintertime Bering Sea marginal ice zone  

NASA Astrophysics Data System (ADS)

Winter titration alkalinity, total CO 2, pCO 2 and calcium profiles across the marginal ice zone of the central and southeastern Bering Sea shelf were obtained for the first time. The data indicate that Bering Sea Shelf Water was significantly affected by river runoff, and conservative mixing dominated the distribution of physical-chemical properties on the shelf. Low salinity waters had high normalized alkalinity, normalized total CO 2, and normalized calcium concentrations but low pCO 2. Total CO 2 data indicated organic carbon production rates of 2.9 ± 1.1 and 2.2 ± 1.1g C m -2day -1, respectively, on the shelf and in the Aleutian Basin between March and June. Calcium data suggested a vertical inorganic carbon flux of 0.075 ?mol kg -1 y -1, which represents approximately 35% of the total carbon flux in the Aleutian Basin. The entire Bering Sea Shelf Water was saturated by the anthropogenic CO 2, but excess CO 2 penetrates to no more than 1000 m in the Aleutian Basin and no excess CO 2 can be found in the Bering Sea Bottom Water. The entire Bering Sea contains 0.19 ± 0.05 × 10 15g anthropogenic carbon. The shelf water is now supersaturated with respect to calcite and aragonite, but could become undersaturated with a doubling of the current atmospheric CO 2 level. The carbonate deposits on the shelf could then begin to neutralize excess CO 2 and become an important excess CO 2 sink.

Chen, Chen-Tung A.

1993-01-01

27

Introductory college chemistry students' understanding of stoichiometry: Connections between conceptual and computational understandings and instruction  

NASA Astrophysics Data System (ADS)

Previous research has shown a gap between chemistry students' conceptual and computational understandings of chemistry topics such as gas laws, equilibrium, and reactions. This qualitative study examined the conceptual and computational understandings of stoichiometry of college students enrolled in a large lecture Introductory Chemistry course. Factors that might influence students' understandings were examined to determine their influence. Possible influential factors examined included students' prior coursework, and their current chemistry instruction. Instruction on stoichiometry was examined through classroom observations, an instructor interview, and review of the course resources. Course exams and out-of-class assignments were also examined for their influence on students. Student volunteers (n = 6) were interviewed to gauge their understanding of stoichiometry. Students' understanding was assessed through tasks that included a card sort, solving conceptual and computational problems, drawing representations of reactions, and answering questions concerning their philosophy of learning chemistry. Results indicated that students had an acceptable understanding of the particulate nature of matter but did not apply this knowledge to problem solving. The students were most comfortable solving computational problems where they could apply algorithms learned from their instructor. The students also applied algorithms in answering conceptual problems. There appeared to be a connection between the students' conceptual structures of stoichiometry and their ability to solve computational problems. The lack of conceptual questions in assessment appeared to be a major contributing factor in the students' lack of conceptual understanding because the students discounted the importance of learning aspects of stoichiometry that were not included on exams. Other contributing factors included the computational focus of instruction on limiting reactant problems, textbook presentation, and student exercises.

Wolfer, Adam Joseph

28

Spatial and temporal variation in the natal otolith chemistry of a Hawaiian reef fish: prospects for measuring population connectivity  

Microsoft Academic Search

One of the most compelling unanswered questions in marine ecology is the extent to which local populations are connected via larval exchange. Recent work has suggested that variation in the chemistry of otoliths (earstones) of fishes may function as a natural tag, potentially allowing investigators to determine sources of individual larvae and esti- mate larval connectivity. We analyzed the spatial

Benjamin I. Ruttenberg; Scott L. Hamilton; Robert R. Warner

2008-01-01

29

Thalamic and extrathalamic connections of the dysgranular unresponsive zone in the grey squirrel (Sciurus carolinensis).  

PubMed

The connections of the cortical dysgranular "unresponsive zone" (UZ) (Sur et al.: J. Comp. Neurol. 179:425-450, '78) in the grey squirrel were studied with horseradish peroxidase and autoradiographic techniques. The results of these experiments show that the major subcortical connections of the unresponsive zone are in large part reciprocal. Connections are distributed within the thalamus in a poorly defined region including restricted portions of several nuclei that lie along the rostral, dorsal, and caudal borders of the ventral posterior nucleus. Additional thalamic connections of the UZ terminate in the reticular nucleus and are reciprocally related to the paralaminar and central median nuclei. Extrathalamic terminations were observed in the zona incerta, the intermediate and deep layers of the superior colliculus, the red nucleus, and several subdivisions of the pontine nuclei. The similarity between the pattern of subcortical connections of the UZ in the grey squirrel and patterns reported for the parietal septal region in rats (Chapin and Lin: J. Comp. Neurol. 229:199-213, '84) and for area 3a in primates (Friedman and Jones: J. Neurophysiol. 45:59-85, '81), suggests that the UZ in the grey squirrel may represent a counterpart of at least part of area 3a as described in primates. The results are further discussed with respect to a possible role of the thalamus in control or modulation of interhemispheric circuits and of the UZ in the modulation of nociceptive and kinesthetic pathways through the thalamus. Finally, the term parietal dysgranular cortex (PDC) is proposed as an alternative to denote the region currently called the unresponsive zone. PMID:2477399

Gould, H J; Whitworth, R H; LeDoux, M S

1989-09-01

30

Aviation -- Global change connection from the perspective of the emerging new chemistry of nitrous oxide  

SciTech Connect

The emerging new chemistry of nitrous oxide (N{sub 2}O) suggests some fresh insight into the potential connection between high speed civil transportation system (aviation) which is a significant form of the anthropogenic activity, and global change. The two are connected because the high speed flights through the atmosphere deposit oxide of nitrogen and soot in the atmosphere and also generate contrails which affect global distributions of ozone and cloudiness. Based on the current ideas about the atmospheric odd-nitrogen (NO{sub x}) chemistry, aviation is generally thought to have no long range adverse effect on climate. However, recent theoretical and experimental studies of the atmospheric sources and sinks of nitrous oxide (N{sub 2}O) suggest that the contemporary ideas about the atmospheric NO{sub x} chemistry could be inadequate. Laboratory experiments, for example, show that the reactions of electronically excited NO{sub 2} and the excited O{sub 3} formed by (O, O{sub 2}) and (O({sup 1}D), O{sub 2}) recombination may be significant sources of N{sub 2}O in the troposphere, with a potential to provide as much as 6 Tg/yr to the atmosphere. Furthermore, recent experiments and chemical detailed balancing arguments, show that the reaction between N{sub 2} and O{sub 2} (B{sup 3}{Sigma}) state which is efficiently produced solar optical pumping, is also a stratospheric source of N{sub 2}O. The discovery of these sources imply that there must also be photochemically coupled sinks of N{sub 2}O in the stratosphere that satisfy the constraints imposed by the in-situ mixing ratio data and may account for the unique isotope signature of stratospheric N{sub 2}O.

Prasad, S.S. [Creative Research Interprises, Pleasanton, CA (United States); Zipf, E.C. [Univ. of Pittsburgh, PA (United States). Dept. of Physics

1996-12-31

31

Dynamic Hydrologic Connectivity through the Vadose Zone: Snowmelt Interaction with Groundwater and Streamflow  

NASA Astrophysics Data System (ADS)

Quantifying spatial and temporal dynamics of rainfall and snowmelt movement into groundwater and stream networks presents many challenges, especially in the vadose zone in snow dominated systems of forested mountain environments. Soil thickness and physical properties vary widely. The structure and hydraulic properties of the saprolite within the weathering zone are poorly understood. Forest disturbances alter snow hydrology, change the magnitude and timing of snowmelt, and alter infiltration into and through the vadose zone. Knowledge emerges on individual components and processes while modelling studies provide insights into effects of changing climate drivers on streamflow based on generalized connections of precipitation and groundwater systems. Prediction of groundwater recharge and streamflow regimes under scenarios of climate and land cover change requires broad-scale integration of surface and sub-surface hydrology with improved understanding of vadose zone processes. Research initiatives at the Wyoming Center for Environmental Hydrology and Geophysics combine near-surface geophysics and conventional and experimental methods in ecohydrology, hydropedology, and hydrogeology to quantify and characterize effects of forest disturbance on the timing, magnitude, and pathways of snowmelt in the Snowy Mountains of Wyoming. This presentation provides conceptual models and preliminary data from of this integrated research approach.

Hyde, Kevin; Carr, Bradley; Dogan, Mine; Elwaseif, Mehrez; Kipnis, Evan; Peckham, Scott; Miller, Scott; Holbrook, Steve

2014-05-01

32

Hydrologic connectivity increases denitrification in the hyporheic zone and restored floodplains of an agricultural stream  

NASA Astrophysics Data System (ADS)

Stream ecotones, specifically the lateral floodplain and subsurface hyporheic zone, can be important sites for nitrogen (N) removal via denitrification, but their role in streams with constructed floodplains has not been examined. We studied denitrification in the hyporheic zone and floodplains of an agriculturally influenced headwater stream in Indiana, USA, that had floodplains added as part of a "two-stage ditch" restoration project. To examine the potential for N removal in the hyporheic zone, we seasonally measured denitrification rates and nitrate concentrations by depth into the stream sediments. We found that nitrate concentration and denitrification rates declined with depth into the hyporheic zone, but denitrification was still measureable to a depth of at least 20 cm. We also measured denitrification rates on the restored floodplains over the course of a flood (pre, during, and post-inundation), and also compared denitrification rates between vegetated and non-vegetated areas of the floodplain. We found that floodplain denitrification rates increased over the course of a floodplain inundation event, and that the presence of surface water increased denitrification rates when vegetation was present. Stream ecotones in midwestern, agriculturally influenced streams have substantial potential for N removal via denitrification, particularly when they are hydrologically connected with high-nitrate surface water.

Roley, Sarah S.; Tank, Jennifer L.; Williams, Maureen A.

2012-09-01

33

7/22/08 11:54 AM 1 Particulate Matter Chemistry and Dynamics in the Twilight Zone at VERTIGO ALOHA1  

E-print Network

7/22/08 11:54 AM 1 Particulate Matter Chemistry and Dynamics in the Twilight Zone at VERTIGO ALOHA1 Abstract.13 Understanding particle dynamics in the `Twilight Zone' is critical to prediction of the14 ocean

Buesseler, Ken

34

Introductory College Chemistry Students' Understanding of Stoichiometry: Connections between Conceptual and Computational Understandings and Instruction.  

ERIC Educational Resources Information Center

Many studies of college chemistry students have found a gap between students' success in solving computational chemistry problems and their success in solving conceptual chemistry problems. This paper examines college students' understanding of the concept of stoichiometry, the particulate nature of matter, and chemistry problem solving. This…

Wolfer, Adam J.; Lederman, Norman G.

35

Emerging knowledge through an emergent perspective: High-school students' inquiry, exploration and learning in Connected Chemistry  

Microsoft Academic Search

We investigate students' strategies in exploring computer models and the way these relate to the underlying mathematical behavior of the model, and to prior knowledge in the domain. In the Modeling Across the Curriculum project (Gobert et al, 2003), we enable students' exploration of computer models that are embedded in a supporting script. The Connected Chemistry environment (Levy, Novak &

Sharona T. Levy; Uri Wilensky

36

Connections  

NSF Publications Database

... physical sciences. In addition, the interplay among physics, chemistry, mathematics, biology, and ... language of that future. Unprecedented control over materials and processes will allow industry to ...

37

Project EARTH-12-PPS1: Weathering Rates in the Critical Zone: Soil Erosion, River Chemistry and Climate  

E-print Network

Project EARTH-12-PPS1: Weathering Rates in the Critical Zone: Soil Erosion, River Chemistry and Climate Change Supervisors: Dr. Philip Pogge von Strandmann and Prof. Gideon Henderson Chemical weathering weathering has also been proposed as a geo-engineering method to sequester carbon. It has therefore become

Henderson, Gideon

38

Vadose Zone Processes and Chemical Transport Effects of Spent Mushroom Substrate Weathering on the Chemistry of Underlying Soils  

E-print Network

Vadose Zone Processes and Chemical Transport Effects of Spent Mushroom Substrate Weathering on the Chemistry of Underlying Soils Mingxin Guo, Jon Chorover,* and Richard H. Fox ABSTRACT mushroom production mushroom substrate (SMS) before its reuse. During the weathering process, leachate containing high

Chorover, Jon

39

Chemistry  

NSDL National Science Digital Library

Finds ChemEd DL resources related to the sections of the General Chemistry textbook, Chemistry, by Kenneth W. Whitten, Raymond E. Davis, M. Larry Peck, George G. Stanley published by Brooks/Cole, 2010.

40

Making Sense of Olive Oil: Simple Experiments to Connect Sensory Observations with the Underlying Chemistry  

ERIC Educational Resources Information Center

In the last decade, our understanding of the chemistry of olive oil has dramatically improved. Here, the essential chemistry of olive oil and its important minor constituents is described and related to the typical sensory categories used to rate and experience oils: color, aroma, bitterness, and pungency. We also describe experiments to explore…

Blatchly, Richard A.; Delen, Zeynep; O'Hara, Patricia B.

2014-01-01

41

Vygotskian-based grouping: Utilizing the zone of proximal development in a chemistry laboratory  

NASA Astrophysics Data System (ADS)

A large portion of any science major's curriculum utilizes laboratories. Many of these laboratories now incorporate cooperative learning as a result of studies attesting to its beneficial effects. However, little attention has been given to the composition of those groups, specifically at post-secondary education institutes. We have therefore investigated the effectiveness of a grouping technique based on the theories of L. S. Vygotsky and his construct of the zone of proximal development (ZPD) in the context of an undergraduate general chemistry laboratory course at The University of Texas at Austin. All students were responsible for the completion of a short, 11 question, pre-quiz. Depending on their respective classes, students were grouped either according to the ZPD-scheme, based on pre-quiz scores, or randomly, regardless of pre-quiz score. Achievement of the students in each of the two groups was compared in order to determine grouping effectiveness. This study was carried out for 3 semesters (spring 2003, spring 2004, and fall 2004) under two different instructors. Overall, results indicate that grouping according to the ZPD-scheme revealed higher student achievement versus random grouping. Moreover, students scoring low and average on pre-quizzes benefited far more from this grouping method than higher scoring students. The protocol for implementing this grouping scheme is straightforward and is discussed in detail.

Briggle, Justin David

42

Connections between the Intertropical Convergence Zone and the Caribbean Low Level Jet in Central America  

NASA Astrophysics Data System (ADS)

This study explores statistical connections between the displacements and strength of the Intertropical Convergence Zone (ITCZ) and the Caribbean Low Level Jet (CLLJ). Indicators of the strength and position of the ITCZ include the latitude (LATC) and longitude (LONC) of the center of mass of precipitation and the mean domain precipitation (Pdomain) in a region bounded by coordinates 10 oS and 25 oN and 100 - 55 oW. The CLLJ was indexed using the average zonal wind velocity at 925 hPa over a region bounded by 7.5 - 12.5 oN and 85 - 75 oW. Preliminary analyses show that there is a strong correlation (0.82) between summer (JJA) LATC and JJA CLLJ index for the period 1979 - 2010; this correlation is lower in other seasons (0.63 for Autumn, 0.20 for Winter and 0.49 for Spring). These correlations were verified in the zonal wind composites at 925 hPa for the 5 lowest and 5 highest years of LATC. LONC does not seem to have the same strong relationship with the CLLJ. At daily level, composites show that precipitation in the Central America region is influenced by Pdomain, LATC, and the CLLJ index. From the comparison between the highest and lowest years of LATC, a strong contrast is observed for the evaporation over the Caribbean and the moisture transport to Central America. Moisture uptake increases significantly for the lowest LATC which corresponds to a stronger CLLJ. Composites of Sea Surface Temperature for the 5 years of highest and lowest LATC show some relationship with ENSO, although there is a disproportionate influence of the 1997-98 El Niño that may be affecting the results. There is however a consistent feature: during years of high LATC, there are warm anomalies in the tropical Atlantic off the coast of Venezuela, that are not present during years of low LATC.

Hidalgo, H. G.; Durán-Quesada, A.; Amador, J.; Alfaro, E. J.

2013-05-01

43

Students' Learning with the Connected Chemistry (CC1) Curriculum: Navigating the Complexities of the Particulate  

E-print Network

of the Particulate World Sharona T. Levy Ã? Uri Wilensky Ã? Springer Science+Business Media, LLC 2009 Abstract molecular theory in chemistry (Levy and Wilensky 2009). An investigation was conducted into high targeting the topics of (macro) gas laws and (submicro) kinetic molecular theory (KMT). CC1 uses Net

Wilensky, Uri

44

For the Love of Learning Science: Connecting Learning Orientation and Career Productivity in Physics and Chemistry  

ERIC Educational Resources Information Center

An individual's motivational orientation serves as a drive to action and can influence their career success. This study examines how goal orientation toward the pursuit of a graduate degree in physics and chemistry influences later success outcomes of practicing physicists and chemists. Two main categories of goal orientation are examined in this…

Hazari, Zahra; Potvin, Geoff; Tai, Robert H.; Almarode, John

2010-01-01

45

The recoil transfer chamber—An interface to connect the physical preseparator TASCA with chemistry and counting setups  

NASA Astrophysics Data System (ADS)

Performing experiments with transactinide elements demands highly sensitive detection methods due to the extremely low production rates (one -atom -at -a -time conditions). Preseparation with a physical recoil separator is a powerful method to significantly reduce the background in experiments with sufficiently long-lived isotopes ( t1/2?0.5 s). In the last years, the new gas-filled TransActinide Separator and Chemistry Apparatus (TASCA) was installed and successfully commissioned at GSI. Here, we report on the design and performance of a Recoil Transfer Chamber (RTC) for TASCA—an interface to connect various chemistry and counting setups with the separator. Nuclear reaction products recoiling out of the target are separated according to their magnetic rigidity within TASCA, and the wanted products are guided to the focal plane of TASCA. In the focal plane, they pass a thin Mylar window that separates the ˜1 mbar atmosphere in TASCA from the RTC kept at ˜1 bar. The ions are stopped in the RTC and transported by a continuous gas flow from the RTC to the ancillary setup. In this paper, we report on measurements of the transportation yields under various conditions and on the first chemistry experiments at TASCA—an electrochemistry experiment with osmium and an ion exchange experiment with the transactinide element rutherfordium.

Even, J.; Ballof, J.; Brüchle, W.; Buda, R. A.; Düllmann, Ch. E.; Eberhardt, K.; Gorshkov, A.; Gromm, E.; Hild, D.; Jäger, E.; Khuyagbaatar, J.; Kratz, J. V.; Krier, J.; Liebe, D.; Mendel, M.; Nayak, D.; Opel, K.; Omtvedt, J. P.; Reichert, P.; Runke, J.; Sabelnikov, A.; Samadani, F.; Schädel, M.; Schausten, B.; Scheid, N.; Schimpf, E.; Semchenkov, A.; Thörle-Pospiech, P.; Toyoshima, A.; Türler, A.; Vicente Vilas, V.; Wiehl, N.; Wunderlich, T.; Yakushev, A.

2011-05-01

46

Carbonate chemistry in the coastal zone responds more strongly to eutrophication than to ocean acidification  

Microsoft Academic Search

The accumulation of anthropogenic CO2 in the ocean has altered carbonate chemistry in surface waters since pre-industrial times and is expected to continue to do so in the coming centuries. Changes in carbonate chemistry can modify the rates and fates of marine primary production and calcification. These modifications can in turn lead to feed-backs on increasing atmospheric CO2. We show

Alberto V. Borges; Gypens Nathalie

2010-01-01

47

APPLICATIONS OF MOLECULAR CONNECTIVITY INDEXES AND MULTIVARIATE ANALYSIS IN ENVIRONMENTAL CHEMISTRY  

EPA Science Inventory

The authors have developed a data matrix of 90 variables calculated from molecular connectivity indices for 19,972 chemicals in the Toxic Substance Control Act (TSCA) inventory of industrial chemicals. The first three principal components convey generalized information on chemica...

48

Archean inheritance in zircon from late Paleozoic granites from the Avalon zone of southeastern New England: an African connection  

USGS Publications Warehouse

In southeastern New England the Narragansett Pier Granite locally intrudes Carboniferous metasedimentary rocks of the Narragansett basin, and yields a monazite UPb Permian emplacement age of 273 ?? 2 Ma. Zircon from the Narragansett Pier Granite contains a minor but detectable amount of an older, inherited component, and shows modern loss of lead. Zircon from the late-stage, aplitic Westerly Granite exhibits a more pronounced lead inheritance -permitting the inherited component to be identified as Late Archean. Such old relict zircon has not been previously recognized in Proterozoic to Paleozoic igneous rocks in New England, and may be restricted to late Paleozoic rocks of the Avalon zone. We suggest that the Archean crustal component reflects an African connection, in which old Archean crust was underplated to the Avalon zone microplate in the late Paleozoic during collision of Gondwanaland with Avalonia. ?? 1987.

Zartman, R.E.; Don, Hermes O.

1987-01-01

49

Trigeminal transition zone/rostral ventromedial medulla connections and facilitation of orofacial hyperalgesia after masseter inflammation in rats.  

PubMed

Recent studies have implicated a role for the trigeminal interpolaris/caudalis (Vi/Vc) transition zone in response to orofacial injury. Using combined neuronal tracing and Fos protein immunocytochemistry, we investigated functional connections between the Vi/Vc transition zone and rostral ventromedial medulla (RVM), a key structure in descending pain modulation. Rats were injected with a retrograde tracer, FluoroGold, into the RVM 7 days before injection of an inflammatory agent, complete Freund's adjuvant, into the masseter muscle and perfused at 2 hours postinflammation. A population of neurons in the ventral Vi/Vc overlapping with caudal ventrolateral medulla, and lamina V of the trigeminal subnucleus caudalis (Vc), exhibited FluoroGold/Fos double staining, suggesting the activation of the trigeminal-RVM pathway after inflammation. No double-labeled neurons were found in the dorsal Vi/Vc and laminae I-IV of Vc. Injection of an anterograde tracer, Phaseolus vulgaris leucoagglutinin, into the RVM resulted in labeling profiles overlapped with the region that showed FluoroGold/Fos double labeling, suggesting reciprocal connections between RVM and Vi/Vc. Lesions of Vc with a soma-selective neurotoxin, ibotenic acid, significantly reduced inflammation-induced Fos expression as well as the number of FluoroGold/Fos double-labeled neurons in the ventral Vi/Vc (P<0.05). Compared with control rats, lesions of the RVM (n=6) or Vi/Vc (n=6) with ibotenic acid led to the elimination or attenuation of masseter hyperalgesia/allodynia developed after masseter inflammation (P<0.05-0.01). The present study demonstrates reciprocal connections between the ventral Vi/Vc transition zone and RVM. The Vi/Vc-RVM pathway is activated after orofacial deep tissue injury and plays a critical role in facilitating orofacial hyperalgesia. PMID:16304628

Sugiyo, Shinichi; Takemura, Motohide; Dubner, Ronald; Ren, Ke

2005-12-26

50

Stream-upland connectivity through the riparian zone: lessons learned and future research needs (Invited)  

NASA Astrophysics Data System (ADS)

Riparian zones act both as a conduit and a buffer for water and solutes as they transit from the upland environment to the stream. However, the traditional view of riparian hydrological functioning whereby the flow of water and solutes is generally from upland to stream has recently been challenged in some settings. For instance, in large outwash floodplains of the US Midwest, streams and rivers can have a dominant influence on riparian water table dynamics and associated biogeochemistry (nitrogen, phosphorus, carbon, mercury). In glacial till settings of the US Northeast, stream meander curvature has been shown to have a large impact on near stream zone hydrology and biogeochemistry. In the US southeast, stream restoration practices have far reaching impacts in the near stream zone. This talk will provide a framework to conceptualize riparian function as a function of stream channel morphology and landscape hydrogeomorphic characteristics. The implications of this work on riparian zone hydrology and biogeochemistry within the context of stream restoration and watershed management will be discussed along with key research needs for years to come.

Vidon, P.

2013-12-01

51

For the love of learning science: Connecting learning orientation and career productivity in physics and chemistry  

NSDL National Science Digital Library

An individualâs motivational orientation serves as a drive to action and can influence their career success. This study examines how goal orientation toward the pursuit of a graduate degree in physics and chemistry influences later success outcomes of practicing physicists and chemists. Two main categories of goal orientation are examined in this paper: performance orientation or motivation to demonstrate oneâs ability or performance to others, and learning orientation or motivation through the desire to learn about a topic. The data were obtained as part of Project Crossover, a mixed-methods study which focused on studying the transition from graduate student to scientist in the physical sciences and included a survey of members of two national professional physical science organizations. Using regression analysis on data from 2353 physicists and chemists, results indicate that physicists and chemists who reported a learning orientation as their motivation for going to graduate school were more productive, in terms of total career primary and/or first-author publications and grant funding, than those reporting a performance orientation. Furthermore, given equal salary, learning-oriented individuals produced more primary and/or first-author publications than their nonlearning oriented counterparts.

Hazari, Zahra; Potvin, Geoff; Tai, Robert H.; Almarode, John

2010-06-30

52

Water chemistry and plankton composition in the mixing zone of the Selenga River with Lake Baikal  

NASA Astrophysics Data System (ADS)

Seasonal and inter-annual variations of chemical components, bacterio- and phytoplankton and autotrophic picoplankton (APP) were studied in the distributaries of the Selenga River, Selenga shallow waters (Selenga shoal) and Lake Baikal for 2003-2013. Major variations in the chemical composition of river waters were recorded at a distance of 1-3 km off the mouths of the Selenga River distributaries (mixing zone). The total quantity of major ions and plankton composition and abundance served as indicators to distinguish between river and lake waters. Phytoplankton concentration was high in the mixing zone and caused the reduction of nutrients in this area. Changes in species composition of phytoplankton, APP, dominant groups of bacterioplankton were observed in the Selenga shoal. River phytoplankton prevailed near the mouths of distributaries, in the mixing zone these were replaced by lake species, and at a distance of 7 km offshore phytoplankton composition was typical of Lake Baikal. Organotrophic microorganisms dominated in the Selenga River water. In the mixing zone, all bacterial groups were represented in equal proportions. Oligotrophic and psychrotolerant bacteria prevailed in Lake Baikal. As the distance from the river delta increased, phycocyanin-rich picocyanobacteria were replaced by phycoerythrin-rich picocyanobacteria and the contribution of picoplankton biomass to total phytoplankton biomass was raised. Near the mouth of distributaries, APP biomass was 5 times lower than the phytoplankton biomass whilst at a distance of 7 km it was 2 times higher than typical values for Baikal phytoplankton.

Tomberg, Irina; Sorokovikova, larisa; Popovskaya, Galina; Belykh, Olga; Bashenkhaeva, Nadya; Parfenova, Valentina

2014-05-01

53

Hydrogeophysical imaging of deposit heterogeneity and groundwater chemistry changes during DNAPL source zone bioremediation  

NASA Astrophysics Data System (ADS)

Robust characterization and monitoring of dense nonaqueous phase liquid (DNAPL) source zones is essential for designing effective remediation strategies, and for assessing the efficacy of treatment. In this study high-resolution cross-hole electrical resistivity tomography (ERT) was evaluated as a means of monitoring a field-scale in-situ bioremediation experiment, in which emulsified vegetable oil (EVO) electron donor was injected into a trichloroethene source zone. Baseline ERT scans delineated the geometry of the interface between the contaminated alluvial aquifer and the underlying mudstone bedrock, and also the extent of drilling-induced physical heterogeneity. Time-lapse ERT images revealed major preferential flow pathways in the source and plume zones, which were corroborated by multiple lines of evidence, including geochemical monitoring and hydraulic testing using high density multilevel sampler arrays within the geophysical imaging planes. These pathways were shown to control the spatial distribution of the injected EVO, and a bicarbonate buffer introduced into the cell for pH control. Resistivity signatures were observed within the preferential flow pathways that were consistent with elevated chloride levels, providing tentative evidence from ERT of the biodegradation of chlorinated solvents.

Chambers, J. E.; Wilkinson, P. B.; Wealthall, G. P.; Loke, M. H.; Dearden, R.; Wilson, R.; Allen, D.; Ogilvy, R. D.

2010-10-01

54

Hydrogeophysical imaging of deposit heterogeneity and groundwater chemistry changes during DNAPL source zone bioremediation.  

PubMed

Robust characterization and monitoring of dense nonaqueous phase liquid (DNAPL) source zones is essential for designing effective remediation strategies, and for assessing the efficacy of treatment. In this study high-resolution cross-hole electrical resistivity tomography (ERT) was evaluated as a means of monitoring a field-scale in-situ bioremediation experiment, in which emulsified vegetable oil (EVO) electron donor was injected into a trichloroethene source zone. Baseline ERT scans delineated the geometry of the interface between the contaminated alluvial aquifer and the underlying mudstone bedrock, and also the extent of drilling-induced physical heterogeneity. Time-lapse ERT images revealed major preferential flow pathways in the source and plume zones, which were corroborated by multiple lines of evidence, including geochemical monitoring and hydraulic testing using high density multilevel sampler arrays within the geophysical imaging planes. These pathways were shown to control the spatial distribution of the injected EVO, and a bicarbonate buffer introduced into the cell for pH control. Resistivity signatures were observed within the preferential flow pathways that were consistent with elevated chloride levels, providing tentative evidence from ERT of the biodegradation of chlorinated solvents. PMID:20728959

Chambers, J E; Wilkinson, P B; Wealthall, G P; Loke, M H; Dearden, R; Wilson, R; Allen, D; Ogilvy, R D

2010-10-21

55

Interactions Between Diffuse Groundwater Recharge and Hyporheic Zone Chemistry in Spring-Fed River: Implications for Metal, Nutrient & Carbonate Cycling  

NASA Astrophysics Data System (ADS)

Diffuse groundwater flow through stream-bed sediments can represent water with a chemically distinct composition, influencing elemental cycling and ecosystem dynamics. Diffuse flow may be particularly important in systems where hyporheic exchange is small. The entirely spring-sourced Ichetucknee River (north-central Florida) is a model system for distinguishing the processes controlling solute sources and cycling due to its stable discharge (6-9 m3/s), constant but distinct spring chemistry through time, and minimal hyporheic exchange. Most stream solute concentrations exhibit large diel cycles, but these changes do not explain all observed longitudinal changes in river chemistry. Ca, Fe, and PO4 concentrations are all elevated in river water over the flow-weighted average of the source springs (Ca = 1.37 vs 1.31 mM; Fe = 8 vs. 0.4 ?g/L; PO4 = 54 vs. 49 ?g/L) despite evidence of in-stream removal of these solutes by biotic and abiotic processes. Cl concentrations are also elevated in the river over the spring sources and previous calculations estimated an additional 0.75 m3/s of water was needed to close the Cl budget of the river. Diffuse groundwater flow could be the source of these additional solutes and flow. To estimate the impact of diffuse flow interacting with hyporheic zone chemistry on the metal, nutrient, and carbonate chemistry of the Ichetucknee River we compared the chemistry of the springs and river with measurements of pore-water chemistry and hydraulic gradients within the unconsolidated channel sediments. A cross-river transect of four pore-water chemical profiles indicate that pore-water chemistry is dominated by the mineralization of organic carbon, resulting in pore-waters undersaturated with respect to calcite and elevated in Ca, Fe, and PO4 concentrations (ca. 1.44 mM, 2000 ?g/L, and 150-300 ?g/L, respectively) relative to the river. A diffuse flow rate through the river sediments of 0.2-0.7 m3/s, would account for the addition of both PO4 and Ca in the river, and is comparable with previous calculations based on the Cl budget. This flow rate would cause Fe concentrations of the river to exceed, by several orders of magnitude, the measured Fe concentrations. However, most of this Fe is likely oxidized at the sediment-water interface as it reaches the water column and thus sequestered as solid Fe-oxides. Hydraulic heads in the pore-waters, measured at 70-140 cm deep stilling wells co-located with the chemical profiles, are consistently higher in the pore-waters relative to the river (?h = 6-9 cm), confirming that diffuse flow could be contributing to the river. Diffuse flow calculated from these vertical head gradients and measurements of hydraulic conductivity indicate a maximum flow rate of only 0.06 m3/s, when integrated across the area of the stream bed. The discrepancy between the hydrology- and solute-based flow rates likely results from heterogeneity in the river-groundwater flow system resulting from features such as channel incision into the river sediments and higher horizontal than vertical hydraulic conductivities in the sediment. This heterogeneity in diffuse flow illustrates the necessity of applying a range of hydrologic and geochemical techniques when estimating diffuse groundwater inputs to streams.

Kurz, M. J.; Martin, J. B.; Cohen, M.

2012-12-01

56

A synoptic view of the distribution and connectivity of the mid-crustal low velocity zone beneath Tibet  

NASA Astrophysics Data System (ADS)

Based on 1-2 years of continuous observations of seismic ambient noise data obtained at more than 600 stations in and around Tibet, Rayleigh wave phase velocity maps are constructed from 10 s to 60 s period. A 3-D Vsv model of the crust and uppermost mantle is derived from these maps. The 3-D model exhibits significant apparently inter-connected low shear velocity features across most of the Tibetan middle crust at depths between 20 and 40 km. These low velocity zones (LVZs) do not conform to surface faults and, significantly, are most prominent near the periphery of Tibet. The observations support the internal deformation model in which strain is dispersed in the deeper crust into broad ductile shear zones, rather than being localized horizontally near the edges of rigid blocks. The prominent LVZs are coincident with strong mid-crustal radial anisotropy in western and central Tibet and probably result at least partially from anisotropic minerals aligned by deformation, which mitigates the need to invoke partial melt to explain the observations. Irrespective of their cause in partial melt or mineral alignment, mid-crustal LVZs reflect deformation and their amplification near the periphery of Tibet provides new information about the mode of deformation across Tibet.

Yang, Yingjie; Ritzwoller, Michael H.; Zheng, Yong; Shen, Weisen; Levshin, Anatoli L.; Xie, Zujun

2012-04-01

57

Comparative mineral chemistry and textures of SAFOD fault gouge and damage-zone rocks  

NASA Astrophysics Data System (ADS)

Creep in the San Andreas Fault Observatory at Depth (SAFOD) drillhole is localized to two foliated gouges, the central deforming zone (CDZ) and southwest deforming zone (SDZ). The gouges consist of porphyroclasts of serpentinite and sedimentary rock dispersed in a foliated matrix of Mg-smectite clays that formed as a result of shearing-enhanced reactions between the serpentinite and quartzofeldspathic rocks. The CDZ takes up most of the creep and exhibits differences in mineralogy and texture from the SDZ that are attributable to its higher shearing rate. In addition, a ?0.2-m-wide sector of the CDZ at its northeastern margin (NE-CDZ) is identical to the SDZ and may represent a gradient in creep rate across the CDZ. The SDZ and NE-CDZ have lower clay contents and larger porphyroclasts than most of the CDZ, and they contain veinlets and strain fringes of calcite in the gouge matrix not seen elsewhere in the CDZ. Matrix clays in the SDZ and NE-CDZ are saponite and corrensite, whereas the rest of the CDZ lacks corrensite. Saponite is younger than corrensite, reflecting clay crystallization under declining temperatures, and clays in the more actively deforming portions of the CDZ have better equilibrated to the lower-temperature conditions.

Moore, Diane E.

2014-11-01

58

Comparative mineral chemistry and textures of SAFOD fault gouge and damage-zone rocks  

USGS Publications Warehouse

Creep in the San Andreas Fault Observatory at Depth (SAFOD) drillhole is localized to two foliated gouges, the central deforming zone (CDZ) and southwest deforming zone (SDZ). The gouges consist of porphyroclasts of serpentinite and sedimentary rock dispersed in a foliated matrix of Mg-smectite clays that formed as a result of shearing-enhanced reactions between the serpentinite and quartzofeldspathic rocks. The CDZ takes up most of the creep and exhibits differences in mineralogy and texture from the SDZ that are attributable to its higher shearing rate. In addition, a ?0.2-m-wide sector of the CDZ at its northeastern margin (NE-CDZ) is identical to the SDZ and may represent a gradient in creep rate across the CDZ. The SDZ and NE-CDZ have lower clay contents and larger porphyroclasts than most of the CDZ, and they contain veinlets and strain fringes of calcite in the gouge matrix not seen elsewhere in the CDZ. Matrix clays in the SDZ and NE-CDZ are saponite and corrensite, whereas the rest of the CDZ lacks corrensite. Saponite is younger than corrensite, reflecting clay crystallization under declining temperatures, and clays in the more actively deforming portions of the CDZ have better equilibrated to the lower-temperature conditions.

Moore, Diane E.

2014-01-01

59

Effect of minor chemistry elements on GTA weld fusion zone characteristics of a commercial grade titanium  

SciTech Connect

Gas Tungsten Arc Welding (GTAW) is the most common technique employed in the fabrication of rolled thin tubes. One of the major manufacturing problems concerns the stability of weld fusion zone on materials from different casts, notwithstanding stringent monitoring of the process parameters -- current, voltage and travel speed. These parameters determine the theoretical weld heat and are expected to control the instantaneous mass of melt. According to the data compiled by Sahoo et al., oxygen is known to reduce the surface tension of most of the metals. However, investigations on the role of minor changes in concentrations of elements like sulphur, oxygen, selenium, bismuth, aluminium, and titanium in steels have very often attributed the cast to cast variations to different temperature gradients of surface tension over the weldpool. To the author`s knowledge, no reported work so far has revealed changing weld profiles in autogeneous mechanized GTA welds on titanium due to minor composition changes.

Marya, S.K. [Ecole Centrale Nantes (France). Lab. de Mecanique et Materiaux] [Ecole Centrale Nantes (France). Lab. de Mecanique et Materiaux

1996-06-01

60

Chemistry, isotopic composition, and origin of a methane-hydrogen sulfide hydrate at the Cascadia subduction zone  

USGS Publications Warehouse

Although the presence of extensive gas hydrate on the Cascadia margin, offshore from the western U.S. and Canada, has been inferred from marine seismic records and pore water chemistry, solid gas hydrate has only been found at one location. At Ocean Drilling Program (ODP) Site 892, offshore from central Oregon, gas hydrate was recovered close to the sediment - water interface at 2-19 m below the seafloor, (mbsf) at 670 m water depth. The gas hydrate occurs as elongated platy crystals or crystal aggregates, mostly disseminated irregularly, with higher concentrations occurring in discrete zones, thin layers, and/or veinlets parallel or oblique to the bedding. A 2-to 3-cm thick massive gas hydrate layer, parallel to bedding, was recovered at ???17 mbsf. Gas from a sample of this layer was composed of both CH4 and H2S. This sample is the first mixed-gas hydrate of CH4-H2S documented in ODP; it also contains ethane and minor amounts of CO2. Measured temperature of the recovered core ranged from 2 to - 18??C and are 6 to 8 degrees lower than in-situ temperatures. These temperature anomalies were caused by the partial dissociation of the CH4-H2S hydrate during recovery without a pressure core sampler. During this dissociation, toxic levels of H2S (??34S, +27.4???) were released. The ??13C values of the CH4 in the gas hydrate, -64.5 to -67.5???(PDB), together with ??D values of - 197 to - 199???(SMOW) indicate a primarily microbial source for the CH4. The ??18O value of the hydrate H2O is +2.9???(SMOW), comparable with the experimental fractionation factor for sea-ice. The unusual composition (CH4-H2S) and depth distribution (2-19 mbsf) of this gas hydrate indicate mixing between a methane-rich fluid with a pore fluid enriched in sulfide; at this site the former is advecting along an inclined fault into the active sulfate reduction zone. The facts that the CH4-H2S hydrate is primarily confined to the present day active sulfate reduction zone (2-19 mbsf), and that from here down to the BSR depth (19-68 mbsf) the gas hydrate inferred to exist is a ???99% CH4 hydrate, suggest that the mixing of CH4 and H2S is a geologically young process. Because the existence of a mixed CH4-H2S hydrate is indicative of moderate to intense advection of a methane-rich fluid into a near surface active sulfate reduction zone, technically active (faulted) margins with organic-rich sediments and moderate to high sedimentation rates are the most likely regions of occurrence. The extension of such a mixed hydrate below the sulfate reduction zone should reflect the time-span of methane advection into the sulfate reduction zone. ?? 1998 Elsevier Science B.V. All rights reserved.

Kastner, M.; Kvenvolden, K.A.; Lorenson, T.D.

1998-01-01

61

Fluid Chemistry Dynamics Before and After Fire in the Jemez River Basin Critical Zone Observatory  

NASA Astrophysics Data System (ADS)

The largest wildfire in New Mexico state history (prior to the Whitewater-Baldy fire of 2012) burned the eastern portion of the Jemez River Basin Critical Zone Observatory (JRB CZO) in June-July 2011. This Los Conchas fire burned large stands of ponderosa pine and mixed conifer (MC) forest within the East Fork Jemez River watershed generating massive post-fire erosion. We asked the question: What are the implications of wildfire on pulsed carbon and other bio-active element redistributions in impacted soils and catchments? As soon as possible following the fire, our research group installed sensor and sampler instrumentation in soil profiles in an intensively burned zero order basin (ZOB), enabling the initiation of comparisons to a similarly instrumented, unburned MC ZOB. The signal of biomass combustion was propagated through soil and stream. Post-burn solute fluxes were dominated by highly-aromatic character DOM, as well as elevated DIC, sulfate, chloride and non-hydrolyzing cation (Ca, Mg, K) concentrations deriving from biomass combustion. Supporting an apparent trend of increasing wildfire in western montane forests, the Thompson Ridge wildfire burned MC forest throughout much of the western previously unburned portion of the Valles Caldera National Preserve in June 2013, including the (until then) "unburned" MC ZOB sites comprising CZO sensor and sampler network arrays. Post-burn soil samples were collected for geochemical, physical, and microbial composition characterizations. Solute and gas fluxes were monitored in situ to compare CZ response following this high intensity burn to three years of pre-burn data. Results indicate that the post-fire pulse of water soluble, biomass-derived ions and carbon into underlying and downslope soils is generating landscape-scale element distribution that could affect recolonization by biota in the ensuing secondary succession.

Chorover, J.; Perdrial, J. N.; Field, J. P.; Pelletier, J. D.; Pohlmann, M. A.; Losleben, M. V.; Lasharr, K.; Amistadi, M.; Brooks, P. D.; McIntosh, J. C.; Meixner, T.; Gallery, R.; Rich, V. I.; Rasmussen, C.; Schaap, M. G.; Breshears, D. D.

2013-12-01

62

Particulate matter chemistry and dynamics in the Twilight Zone at VERTIGO ALOHA and K2 Sites  

SciTech Connect

Understanding particle dynamics in the 'Twilight Zone' is critical to prediction of the ocean's carbon cycle. As part of the VERTIGO (VERtical Transformations In the Global Ocean) project, this rarely sampled regime extending from the base of the euphotic layer to 1000 m, was characterized by double-paired day/night Multiple Unit Large Volume in-situ Filtration System (MULVFS) deployments and by {approx}100 high-frequency CTD/transmissometer/turbidity sensor profiles. VERTIGO studies lasting three weeks, contrasted oligotrophic station ALOHA (22.75{sup o}N 158{sup o}W), sampled in June-July 2004, with a biologically productive location (47{sup o}N 161{sup o}E) near station K2 in the Oyashio, occupied July-August 2005. Profiles of major and minor particulate components (C{sub org}, N, P, Ca, Si, Sr, Ba, Mn) in <1, 1-51, and >51 {micro}m size fractions, in-water optics, neutrally buoyant sediment trap (NBST) fluxes, and zooplankton data were intercompared. MULVFS total C{sub org} and C-Star particle beam attenuation coefficient (C{sub P}) were consistently related at both sites with a 27 {micro}M m{sup -1} conversion factor. 26 At K2, C{sub P} profiles further showed a multitude of transient spikes throughout the water column and spike abundance profiles closely paralleled the double peaked abundance profiles of zooplankton. Also at K2, copepods contributed {approx}40% and 10%, night and day, respectively to >51 {micro}m C{sub org} of MULVFS samples in the mixed layer, but few copepods were collected in deeper waters; however, non-swimming radiolarians were quantitatively sampled. A recent hypothesis regarding POC differences between pumps and bottles is examined in light of these results. Particulate >51 {micro}m C{sub org}, N, and P at both ALOHA and K2 showed strong attenuation with depth at both sites. Notable at ALOHA were unusually high levels of >51 {micro}m Sr (up to 4 nM) in the mixed layer, a reflection of high abundances of SrSO{sub 4} precipitating Acantharia. Notable at K2 were major changes in water column inventories of many particulate components to 700 m over 10 days. Carbon mass balance, with the consideration of particle inventory changes included, indicated that over 98% and 96% of primary produced C{sub org} was remineralized shallower than 500 m at ALOHA and K2, respectively. Production of CaCO3 was estimated to be {approx}0.06, 0.89 and 0.02 mmols m{sup -2} d{sup -1} at ALOHA and at K2 during two separate week long study periods, respectively. Similarly, Si production was estimated to be {approx}0.08, 10.7, and 4.2 mols m{sup -2} d{sup -1}. An estimated 50% and 65% of produced Si was remineralized by 500m at ALOHA and K2, respectively. Little carbonate dissolution was seen in the upper 500 m at ALOHA, a reflection of 400% super saturation of surface waters and the 700 m deep saturation horizon. Over 92% of produced CaCO{sub 3} was dissolved shallower than 500 m at K2 and biological enhancement of dissolution was readily apparent in waters above the 200 m calcite saturation horizon.

Bishop, James K.B.; Wood, T.J.

2008-03-25

63

A synoptic view of the distribution and connectivity of the mid-crustal low velocity zone beneath Tibet  

NASA Astrophysics Data System (ADS)

The Tibetan Plateau results from the convergence between the Indian and Eurasian plates. However, the physical processes that have controlled the deformation history of Tibet, particularly the potential localization of deformation either in the vertical or horizontal directions remain subject to debate. There are a growing list and wide variety of observations that suggest that the Tibetan crust is warm and presumably ductile. Some of observations are often taken as prima facie evidence for the existence of partial melt or aqueous fluids in the middle or deep crust beneath Tibet and in some cases for the decoupling or partitioning of strain between the upper crust and uppermost mantle. However, most of this evidence is highly localized along nearly linear seismic or magneto-telluric profiles. This motivates the two questions addressed by this study. First, how pervasive across Tibet are the phenomena on which inferences of the existence of crustal partial melt rest? In particular, how pervasive are mid-crustal low velocity zones across Tibet? Second, what is the geometry or inter-connectivity of the crustal low velocity zones observed across Tibet? In this study, we address these questions by producing a new 3-D model of crustal and uppermost mantle shear wave speeds inferred from Rayleigh wave dispersion observed on cross-correlations of long time series of ambient seismic noise. Broadband seismic data from about 600 stations (Chinese Provincial networks, FDSN, several PASSCAL experiments including the INDEPTH IV experiment) yield about 50,000 inter-station paths, which are used to generate Rayleigh wave phase velocity maps from 10 sec to 50 sec period. The time series lengths in the cross-correlations range from 1 to 2 years in duration. The resulting Rayleigh wave phase velocity maps are inverted for a 3D Vsv model of crustal and upper most mantles. The major results from our model are summarized below: (1) A crustal LVZ exists across most of the high Tibetan Plateau. (2) The distribution of the amplitude of the LVZ is not uniform. In fact, the largest amplitudes (i.e., lowest mid-crustal shear wave speeds) are found predominantly around the periphery of Tibet. (3) The lateral distribution of strong LVZs are coincident with the distribution of strong radial anisotropy in the middle crust, suggesting LVZs of Vsv in the middle crust may be mostly due to the strong radial anisotropy rather than the presence of partial melt or aqueous fluids.

Yang, Y.; Zheng, Y.; Xie, Z.; Ritzwoller, M. H.

2011-12-01

64

Storm-associated hydrodynamics drive transient solute and redox chemistry within the floodplain aquifer and hyporheic zone of a piedmont stream  

NASA Astrophysics Data System (ADS)

Riparian and hyporheic zones are dynamic settings where fluctuations in pore water flow influence redox-sensitive biogeochemical processes and solute transport. We instrumented a riparian-hyporheic zone transect with pressure transducers, redox probes, and pore water samplers to measure hydrology, redox potential, and water chemistry before, during and after Hurricane Sandy in October 2012. The transect spanned opposing, topographically distinct floodplains, consisting of a broad, flat western side and narrow, steep eastern side. The water table on both sides of the stream rose rapidly with rising stage and promoted continuous groundwater discharge to the stream throughout the storm hydrograph. Soil moisture and oxygen isotope data suggest that preferential recharge through macropores drove the rapid water table response. Macropore flow was also implicated in the delivery of oxygenated, carbon-rich water from the land surface into the floodplain aquifer, driving a shift in redox conditions at depth. Groundwater chemistry changed dramatically: DOC concentrations increased while nitrate and metal concentrations decreased. Greater shifts in groundwater chemistry occurred on the steep eastern side and required more time to reestablish after the storm. The eastern floodplain aquifer also drained more rapidly. Topographic variations across the floodplain transect influenced fluid flow paths and residence times that ultimately controlled the spatial and temporal dynamics of groundwater biogeochemistry. Use of paired sensors such as redox and pressure sensors can improve our understanding of hydrobiogeochemical dynamics during storms.

Sawyer, A. H.; Kaplan, L. A.; Lazareva, O.; Michael, H. A.

2013-12-01

65

Making every SAR point count: the development of Chemistry Connect for the large-scale integration of structure and bioactivity data.  

PubMed

The increase in drug research output from patent applications, together with the expansion of public data collections, such as ChEMBL and PubChem BioAssay, has made it essential for pharmaceutical companies to integrate both internal and external 'SAR estate'. The AstraZeneca response has been the development of an enterprise application, Chemistry Connect, containing 45 million unique chemical structures from 18 internal and external data sources. It includes merged compound-to-assay-to-result-to-target relationships extracted from patents, papers and internal data. Users can explore connections between these by searching using drug names or synonyms, chemical structures, patent numbers and target protein identifiers at a scale not previously available. PMID:22024215

Muresan, Sorel; Petrov, Plamen; Southan, Christopher; Kjellberg, Magnus J; Kogej, Thierry; Tyrchan, Christian; Varkonyi, Peter; Xie, Paul Hongxing

2011-12-01

66

Possible Connections Between the Coronado Bank Fault Zone and the Newport-Inglewood, Rose Canyon, and Palos Verdes Fault Zones Offshore San Diego County, California  

Microsoft Academic Search

High-resolution multichannel seismic-reflection and deep-tow Huntec data collected by the USGS were interpreted to map the Coronado Bank fault zone (CBFZ) offshore San Diego County, California. The CBFZ is comprised of several major strands (eastern, central, western) that change in both orientation and degree of deformation along strike. Between Coronado Bank and San Diego, the CBFZ trends N25W and occupies

R. W. Sliter; H. F. Ryan

2003-01-01

67

Fluid chemistry and evolution of hydrothermal fluids in an Archaean transcrustal fault zone network: The case of the Cadillac Tectonic Zone, Abitibi greenstone belt, Canada  

USGS Publications Warehouse

Detailed fluid geochemistry studies on hydrothermal quartz veins from the Rouyn-Noranda and Val-d'Or areas along the transcrustal Cadillac Tectonic Zone (CTZ) indicate that unmineralized (with respect to gold) sections of the CTZ contained a distinct CO2-dominated, H2S-poor hydrothermal fluid. In contrast, both gold mineralized sections of the CTZ (e.g., at Orenada #2) and associated higher order shear zones have a H2O-CO2 ?? CH4-NaCl hydrothermal fluid. Their CO2/H2S ratios indicate H2S-rich compositions. The Br/Cl compositions in fluid inclusions trapped in these veins indicate that hydrothermal fluids have been equilibrated with the crust. Oxygen isotope ratios from hydrothermal quartz veins in the CTZ are consistently 2??? more enriched than those of associated higher order shear zones, which are interpreted to be a function of greater fluid/rock ratios in the CTZ and lower fluid/rock ratios, and more efficient equilibration of the hydrothermal fluid with the wall rock, in higher order shear zones. An implication from this study is that the lower metal endowment of the transcrustal CTZ, when compared with the higher metal endowment in higher order shear zones (ratio of about 1 : 1000), may be the result of the lack of significant amounts of H2O-H2S rich fluids in most of the CTZ. In contrast, gold mineralization in the higher order shear zones appear to be controlled by the high H2S activity of the aqueous fluids, because gold was likely transported in a bisulfide complex and was deposited during sulfidation reactions in the wall rock and phase separation in the quartz veins. ?? 2007 NRC Canada.

Neumayr, P.; Hagemann, S. G.; Banks, D. A.; Yardley, B. W. D.; Couture, J. -F.; Landis, G. P.; Rye, R.

2007-01-01

68

Connection between Cell Phone use, p53 Gene Expression in Different Zones of Glioblastoma Multiforme and Survival Prognoses.  

PubMed

The aim of this paper is to investigate p53 gene expression in the central and peripheral zones of glioblastoma multiforme using a real-time reverse transcription polymerase chain reaction (RT-PCR) technique in patients who use cell phones ?3 hours a day and determine its relationship to clinicopathological findings and overall survival. Sixty-three patients (38 males and 25 females), diagnosed with glioblastoma multiforme (GBM), underwent tumor resection between 2008 and 2011. Patient ages ranged from 25 to 88 years, with a mean age of 55. The levels of expression of p53 in the central and peripheral zone of the GBM were quantified by RT-PCR. Data on p53 gene expression from the central and peripheral zone, the related malignancy and the clinicopatholagical findings (age, gender, tumor location and size), as well as overall survival, were analyzed. Forty-one out of 63 patients (65%) with the highest level of cell phone use (?3 hours/day) had higher mutant type p53 expression in the peripheral zone of the glioblastoma; the difference was statistically significant (P=0.034). Results from the present study on the use of mobile phones for ?3 hours a day show a consistent pattern of increased risk for the mutant type of p53 gene expression in the peripheral zone of the glioblastoma, and that this increase was significantly correlated with shorter overall survival time. The risk was not higher for ipsilateral exposure. We found that the mutant type of p53 gene expression in the peripheral zone of the glioblastoma was increased in 65% of patients using cell phones ?3 hours a day. PMID:25276320

Akhavan-Sigari, Reza; Baf, Morteza Mazloum Farsi; Ariabod, Vahid; Rohde, Veit; Rahighi, Saeed

2014-07-30

69

Connection between Cell Phone use, p53 Gene Expression in Different Zones of Glioblastoma Multiforme and Survival Prognoses  

PubMed Central

The aim of this paper is to investigate p53 gene expression in the central and peripheral zones of glioblastoma multiforme using a real-time reverse transcription polymerase chain reaction (RT-PCR) technique in patients who use cell phones ?3 hours a day and determine its relationship to clinicopathological findings and overall survival. Sixty-three patients (38 males and 25 females), diagnosed with glioblastoma multiforme (GBM), underwent tumor resection between 2008 and 2011. Patient ages ranged from 25 to 88 years, with a mean age of 55. The levels of expression of p53 in the central and peripheral zone of the GBM were quantified by RT-PCR. Data on p53 gene expression from the central and peripheral zone, the related malignancy and the clinicopatholagical findings (age, gender, tumor location and size), as well as overall survival, were analyzed. Forty-one out of 63 patients (65%) with the highest level of cell phone use (?3 hours/day) had higher mutant type p53 expression in the peripheral zone of the glioblastoma; the difference was statistically significant (P=0.034). Results from the present study on the use of mobile phones for ?3 hours a day show a consistent pattern of increased risk for the mutant type of p53 gene expression in the peripheral zone of the glioblastoma, and that this increase was significantly correlated with shorter overall survival time. The risk was not higher for ipsilateral exposure. We found that the mutant type of p53 gene expression in the peripheral zone of the glioblastoma was increased in 65% of patients using cell phones ?3 hours a day.

Akhavan-Sigari, Reza; Baf, Morteza Mazloum Farsi; Ariabod, Vahid; Rohde, Veit; Rahighi, Saeed

2014-01-01

70

Chemistry, isotopic composition, and origin of a methane-hydrogen sulfide hydrate at the Cascadia subduction zone  

Microsoft Academic Search

Although the presence of extensive gas hydrate on the Cascadia margin, offshore from the western U.S. and Canada, has been inferred from marine seismic records and pore water chemistry, solid gas hydrate has only been found at one location. At Ocean Drilling Program (ODP) Site 892, offshore from central Oregon, gas hydrate was recovered close to the sediment-water interface at

Miriam Kastner; Keith A. Kvenvolden; Thomas D. Lorenson

1998-01-01

71

Power Equations and Non-Detection Zone of Passive Islanding Detection and Protection Method for Grid Connected Photovoltaic Generation System  

Microsoft Academic Search

Islanding detection and protection is an important concern for grid connected photovoltaic (PV) power generation system due to personnel and equipment safety. Over\\/under voltage protection (OVP\\/UVP) and over\\/under frequency protection (OFP\\/UFP) are basical inverter resident passive islanding detection method (IDM) for detecting an islanding condition by monitor parameters in point of common coupling (PCC) such as voltage amplitude and frequency

Zengqiang Mi; Fei Wang

2009-01-01

72

An autoradiographic analysis of the cortical connections of the pallidal and cerebellar zones within the feline motor thalamus  

SciTech Connect

The feline motor thalamus relays both basal ganglia and cerebellar inputs to the motor cortex. This complex is classically subdivided into three nuclei: the ventroanterior nucleus (VA), the ventrolateral nucleus (VL), and the ventromedial nucleus (VM). Poor correlation between recognized patterns of cortical and subcortical connectivity and traditional boundaries used to distinguish these nuclei complicate the elucidation of the role they play in the elaboration of motor behavior. The recent demonstration of complementarity for the pallidothalamic and dentatothalamic projections to the motor thalamus of the cat provided the foundation for a revision of these nuclear borders to reflect differences in subcortical connectivity. Using a revised topography, this study analyzed the afferent and efferent connections of the feline VA and VL through the application of both anterograde and retrograde tracing techniques. The extent of the cerebellothalamic projection, as revealed by the bidirectional transport of WGA-HRP, was used to demarcate the boundary between VA and VL. Injections of tritiated amino acids into VA and VL allowed for the autoradiographic tracing of their cortical projections. Autoradiography was also used to demonstrate the distributions of corticothalamic projections from selected pericruciate and posterior parietal subfields to the motor thalamus.

Wensel, J.P.

1989-01-01

73

ANNUAL REPORT. DNAPL SURFACE CHEMISTRY: ITS IMPACT ON DNAPL DISTRIBUTION IN THE VADOSE ZONE AND ITS MANIPULATION TO ENHANCE REMEDIATION  

EPA Science Inventory

The primary hypothesis of this work is that surface-active chemicals and/or microorganisms present in the unsaturated zone can significantly alter interfacial phenomena governing the migration of DNAPLs, thereby affecting the accessibility of a DNAPL during remediation efforts. T...

74

Kitchen Chemistry  

NSDL National Science Digital Library

There is a great deal of chemistry going on in every kitchen, even though most cooks may not be cognizant of the various interactions going on in the pot, wok, or oven. MIT's popular OpenCourseWare Initiative has recently made the contents of Dr. Patricia Christie's course on kitchen chemistry available on this site. Visitors to the site can download the syllabus, take in some assigned readings (and recipes), and look over the assignments. The assignments include investigations that involve emulsifiers, ice cream, peer teaching, and pancakes, among other things. The site also includes links to helpful readings, such as those on chocolate, the health benefits of capsicum, and the world of gluten. For people who wish to bring back the frayed connective tissue between chemistry and the culinary arts, this site is absolutely essential.

Christie, Patricia

2006-01-01

75

Department of Chemistry & Biochemistry UCLA Chemistry, Biochemistry & Chemistry Material Science  

E-print Network

Department of Chemistry & Biochemistry UCLA Chemistry, Biochemistry & Chemistry Material Science ...........................................................................................................................................4 Chemistry & Biochemistry Undergraduate Office..............................................................................................6 Majors in Chemistry & Biochemistry

Levine, Alex J.

76

Hydrogeology, water chemistry, and transport processes in the zone of contribution of a public-supply well in Albuquerque, New Mexico, 2007-9  

USGS Publications Warehouse

The National Water-Quality Assessment Program (NAWQA) of the U.S. Geological Survey began a series of groundwater studies in 2001 in representative aquifers across the Nation in order to increase understanding of the factors that affect transport of anthropogenic and natural contaminants (TANC) to public-supply wells. One of 10 regional-scale TANC studies was conducted in the Middle Rio Grande Basin (MRGB) in New Mexico, where a more detailed local-scale study subsequently investigated the hydrogeology, water chemistry, and factors affecting the transport of contaminants in the zone of contribution of one 363-meter (m) deep public-supply well in Albuquerque. During 2007 through 2009, samples were collected for the local-scale study from 22 monitoring wells and 3 public-supply (supply) wells for analysis of major and trace elements, arsenic speciation, nutrients, dissolved organic carbon, volatile organic compounds (VOCs), dissolved gases, stable isotopes, and tracers of young and old water. To study groundwater chemistry and ages at various depths within the aquifer, the monitoring wells were divided into three categories: (1) each shallow well was screened across the water table or had a screen midpoint within 18.3 m of the water level in the well; (2) each intermediate well had a screen midpoint between about 27.1 and 79.6 m below the water level in the well; and (3) each deep well had a screen midpoint about 185 m or more below the water level in the well. The 24-square-kilometer study area surrounding the "studied supply well" (SSW), one of the three supply wells, consists of primarily urban land within the MRGB, a deep alluvial basin with an aquifer composed of unconsolidated to moderately consolidated deposits of sand, gravel, silt, and clay. Conditions generally are unconfined, but are semiconfined at depth. Groundwater withdrawals for public supply have substantially changed the primary direction of flow from northeast to southwest under predevelopment conditions, to west to east under modern conditions. Analysis of age tracers indicates that groundwater from most sampled wells is dominated by old (pre-1950) water, ranging in mean age from about 4,000 years to more than 22,000 years, but includes a fraction of young (post-1950) recharge. Patterns in chemical and isotopic data are consistent with the conclusions that shallow groundwater in the area typically includes a fraction that evaporated prior to recharge and (or) flushed accumulated solutes out of the unsaturated zone during recharge, and that shallow groundwater has mixed to deeper parts of the aquifer, which receives recharge mainly by seepage from the Rio Grande. Among shallow and intermediate wells that produced water with a fraction of young recharge, that fraction ranged between 1.5 and 46 percent. Samples from the two deep wells had groundwater ages exceeding 18,000 years, with no fraction of young recharge. Two supply wells (including the SSW) had a fraction of young recharge, which ranged between about 3 and 11 percent, despite mean groundwater ages exceeding 10,000 years. The fraction of young recharge to the SSW varied seasonally, probably because seasonal pumping patterns affected local hydraulic gradients and (or) because of flow through the well bore when the SSW is not pumping. Well-bore flow data collected during winter (low-pumping season) indicated that about 61 percent of the water pumped from the SSW entered the well from the intermediate part of the aquifer, and that the remaining 39 percent entered from the deep part of the aquifer. Volatile organic compounds (VOCs) were detected in samples from most shallow and intermediate monitoring wells and from two of three supply wells, including the SSW. Detected VOCs were primarily chlorinated solvents or their degradation products. Many of the wells in which most of these VOCs were detected are located near known sites of solvent contamination that were targeted for sampling because trichloroethylene (TCE) and cis-1,2-dichloroethylene had been detected in the SSW, and several of these wells m

Bexfield, Laura M.; Jurgens, Bryant C.; Crilley, Dianna M.; Christenson, Scott C.

2012-01-01

77

WATER-PLANETS IN THE HABITABLE ZONE: ATMOSPHERIC CHEMISTRY, OBSERVABLE FEATURES, AND THE CASE OF KEPLER-62e AND -62f  

SciTech Connect

Planets composed of large quantities of water that reside in the habitable zone are expected to have distinct geophysics and geochemistry of their surfaces and atmospheres. We explore these properties motivated by two key questions: whether such planets could provide habitable conditions and whether they exhibit discernable spectral features that distinguish a water-planet from a rocky Earth-like planet. We show that the recently discovered planets Kepler-62e and -62f are the first viable candidates for habitable zone water-planets. We use these planets as test cases for discussing those differences in detail. We generate atmospheric spectral models and find that potentially habitable water-planets show a distinctive spectral fingerprint in transit depending on their position in the habitable zone.

Kaltenegger, L. [Max Planck Institute of Astronomy, Koenigstuhl 17, D-69115 Heidelberg (Germany)] [Max Planck Institute of Astronomy, Koenigstuhl 17, D-69115 Heidelberg (Germany); Sasselov, D.; Rugheimer, S., E-mail: kaltenegger@mpia.de [Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138 (United States)

2013-10-01

78

Identifying of deep seated geterogenities in upper mantle under mid-oceanic ridges by travel-time tomography (connection to heat-flow, petrochemical zoning and hydrothermal activity)  

Microsoft Academic Search

We used the approach to study the deep seated structure under Mid-Atlantic, Juan-de-Fuca, Explorer and Gorda mid-oceanic ridges by the seismical tomography method. The difficulties connected with installation of the seismological networks in the regions of Mid-Oceanic ridges (MOR) have resulted in, that an exploration of these locations in global practice to last moment was limited. Only the development of

A. Zhmodik; I. Kulakov; N. Bushenkova; Y. Glazirin; V. Kolobov

2003-01-01

79

Science Connects  

NSDL National Science Digital Library

Science Connects has been chosen to run the STEMNET program for the West of Scotland, and their work will be of great interest to science educators. The STEM ambassador program is what distinguishes the STEMNET program from other STEM programs. The UK-wide program works with "volunteers from a wide range of disciplines, such as forensic science, geology, mechanical engineering, parasitology...etc. who want to share their enthusiasm for their careers to encourage pupils to take an interest in STEM Subjects." The "Case Studies" tab on the left side of any page offers visitors a look at what some ambassadors have done with their field of study. Visitors should check out case study #4, about one Dr. Linda Thomson, who teaches young kids about chemistry and forensics. Visitors will also want to check out case study #9, about Alistair McNeil, who happens to be a health, safety and environment manager who recommends a career in construction. All told, the site is well worth a visit for those interested in promoting STEM education.

80

Insights from trace element geochemistry as to the roles of subduction zone geometry and subduction input on the chemistry of arc magmas  

NASA Astrophysics Data System (ADS)

Subduction zones of continental, transitional, and oceanic settings, relative to the nature of the overriding plate, are compared in terms of trace element compositions of mafic to intermediate arc rocks, in order to evaluate the relationship between subduction parameters and the presence of subduction fluids. The continental Chilean Southern Volcanic Zone (SVZ) and the transitional to oceanic Central American Volcanic Arc (CAVA) show increasing degrees of melting with increasing involvement of slab fluids, as is typical for hydrous flux melting beneath arc volcanoes. At the SVZ, the central segment with the thinnest continental crust/lithosphere erupted the highest-degree melts from the most depleted sources, similar to the oceanic-like Nicaraguan segment of the CAVA. The northern part of the SVZ, located on the thickest continental crust/lithosphere, exhibits features more similar to Costa Rica situated on the Caribbean Large Igneous Province, with lower degrees of melting from more enriched source materials. The composition of the slab fluids is characteristic for each arc system, with a particularly pronounced enrichment in Pb at the SVZ and in Ba at the CAVA. A direct compositional relationship between the arc rocks and the corresponding marine sediments that are subducted at the trenches clearly shows that the compositional signature of the lavas erupted in the different arcs carries an inherited signal from the subducted sediments.

Wehrmann, Heidi; Hoernle, Kaj; Garbe-Schönberg, Dieter; Jacques, Guillaume; Mahlke, Julia; Schumann, Kai

2014-10-01

81

Electrical Connection.  

National Technical Information Service (NTIS)

A mechanical and electrical connection for a piezoelectric member of polymeric material such as polyvinylidene fluoride, and method for forming such a connection. To form the connection, the piezoelectric member is first masked to prevent a preselected po...

W. R. Scott, W. T. Weist, K. M. McMahon, P. Bloomfield

1980-01-01

82

Superacid catalyzed coal conversion chemistry. 1st and 2nd quarterly technical progress reports, September 1, 1983-March 30, 1984. [Model compound consisting of 2 benzene rings connected with various bridging units such as alkylidene, ether, sulfide, etc  

SciTech Connect

In our laboratories we have previously developed a mild coal conversion process. This involves the use of a superacid system consisting of HF and BF/sub 3/ in presence of hydrogen and/or a hydrogen donor solvent. In order to understand the chemistry involved in the process of depolymerization of coal by the HF:BF/sub 3/:H/sub 2/ system we are carrying out a systematic study of a number of coal model compounds. The model compounds selected for present study have two benzene rings connected with various bridging units such as alkylidene, ether, sulfide etc. From studies so far carried out it appears that high pyridine extractibilities achieved by treating coal at temperature below 100/sup 0/C results from the cleavage of bridges such as present in bibenzyl, diphenyl methane, dibenzyl ether, dibenzyl sulfide etc. On the other hand the increased cyclohexane extractibility and distillability observed at relatively higher temperatures and hydrogen pressures reflects the hydrogenation and cleavage of the aromatic backbone in coal structure similar to what is seen in the conversion of model compounds such as biphenyl, diphenyl ether, diphenyl sulfide, anthracene, etc.

Olah, G.A.

1984-01-01

83

Trench Connection  

PubMed Central

‘Trench Connection’ was the first international symposium focusing primarily on the hadal zone (depths greater than 6000 m). It was held at the University of Tokyo's Atmosphere and Ocean Research Institute in November 2010. The symposium was successful in having attracted an international collective of scientists and engineers to discuss the latest developments in the exploration and understanding of the deepest environments on Earth. The symposium sessions were categorized into three themes: (i) new deep-submergence technology; (ii) trench ecology and evolution; and (iii) the physical environment. Recent technological developments have overcome the challenges of accessing the extreme depths, which have in turn prompted an international renewed interest in researching physical and biological aspects of the hadal ecosystems. This bringing together of international participants from different disciplines led to healthy discussions throughout the symposium, providing potential opportunities and realizations of where the future of unravelling hadal ecology lies. Hadal science is still at relatively rudimentary levels compared with those of shallower marine environments; however, it became apparent at the symposium that it is now an ever-expanding scientific field. PMID:21450723

Jamieson, Alan J.; Fujii, Toyonobu

2011-01-01

84

Green Chemistry  

NSDL National Science Digital Library

This special feature page from the American Chemical Society (ACS) showcases the up-and-coming field of "green chemistry," that is, the development of chemical products and processes that eliminate or reduce the use and generation of hazardous substances. A list of principles behind green chemistry, a searchable bibliography of green chemistry references, green chemistry links (including conferences), and an online preview of the ACS-published book Real-World Cases in Green Chemistry are all found at the site. Five video clips on green chemistry from the standpoint of academia, industry, and small business are also featured (Windows Media Player). This page comes from ACS's Green Chemistry Project, a three-year educational project to develop and disseminate green chemistry educational materials for graduate and undergraduate chemistry students. Check back often for updates.

2002-01-01

85

Chemistry of unsaturated zone gases sampled in open boreholes at the crest of Yucca Mountain, Nevada: Data and basic concepts of chemical and physical processes in the mountain  

USGS Publications Warehouse

Boreholes open to the unsaturated zone at the crest of Yucca Mountain, Nevada, were variously sampled for CO2 (including 13C and 14C), CH4, N2, O2, Ar, CFC-11, CFC12, and CFC-113 from 1986 to 1993. Air enters the mountain in outcrops, principally on the eastern slope, is enriched in CO2 by mixing with soil gas, and is advected to the mountain crest, where it returns to the atmosphere. The CFC data indicate that travel times of the advecting gas in the shallow Tiva Canyon hydrogeologic unit are ???5 years. The 14C activities are postbomb to depths of 100 m, indicating little retardation of 14CO2 in the shallow flow systems. The 14C activities from 168 to 404 m in the Topopah Spring hydrogeologic unit are 85-90 pMC at borehole USW-UZ6. The CFC data show that the drilling of USW-UZ6 in 1984 has altered the natural system by providing a conduit through the Paintbrush Nonwelded unit, allowing flow from Topopah Spring outcrops in Solitario Canyon on the west to USW-UZ6, upward in the borehole through the Paintbrush, to the shallow Tiva Canyon flow systems, and out of the mountain.

Thorstenson, D. C.; Weeks, E. P.; Haas, H.; Busenberg, E.; Plummer, L. N.; Peters, C. A.

1998-01-01

86

ENVIRONMENTAL CHEMISTRY  

EPA Science Inventory

Environmental chemistry is applied to estimating the exposure of ecosystems and humans to various chemical environmental stressors. Among the stressors of concern are mercury, pesticides, and arsenic. Advanced analytical chemistry techniques are used to measure these stressors ...

87

Chemistry Notes  

ERIC Educational Resources Information Center

Described are eight chemistry experiments and demonstrations applicable to introductory chemistry courses. Activities include: measure of lattice enthalpy, Le Chatelier's principle, decarboxylation of soap, use of pocket calculators in pH measurement, and making nylon. (SL)

School Science Review, 1976

1976-01-01

88

Chemistry Notes.  

ERIC Educational Resources Information Center

Presents background information, laboratory procedures, classroom materials/activities, and chemistry experiments. Topics include sublimation, electronegativity, electrolysis, experimental aspects of strontianite, halide test, evaluation of present and future computer programs in chemistry, formula building, care of glass/saturated calomel…

School Science Review, 1983

1983-01-01

89

Chemistry Notes  

ERIC Educational Resources Information Center

Thirteen ideas are presented that may be of use to chemistry teachers. Topics covered include vitamin C, industrial chemistry, electrical conductivity, electrolysis, alkali metals, vibration modes infra-red, dynamic equilibrium, and some new demonstrations in gaseous combinations. (PS)

School Science Review, 1972

1972-01-01

90

Chemistry Links  

NSDL National Science Digital Library

This compiled site contains titles and links to over 40 sites, journal articles, course and tutorial materials, simulations, batteries, and other resources. Definitions of chemistry, theoretical chemistry, organic, physical and nuclear chemistry are integrated with the links to outside materials. A number of useful keywords are included to help users navigate the materials.

Charnine, Michael

2011-04-01

91

Chemistry Notes.  

ERIC Educational Resources Information Center

Presents background information, laboratory procedures, classroom materials/activities, and experiments for chemistry. Topics include superheavy elements, polarizing power and chemistry of alkali metals, particulate carbon from combustion, tips for the chemistry laboratory, interesting/colorful experiments, behavior of bismuth (III) iodine, and…

School Science Review, 1982

1982-01-01

92

The cometary connection with prebiotic chemistry  

NASA Technical Reports Server (NTRS)

The latent heat of water ice has been established to control the sublimation of most cometary nuclei. The next most abundant molecules are CO and/or CO2, typically reaching 10-30 percent of the water content. The other species are in the range of 1-10 percent or less and include the newly discovered NH3. HCN and CH3CN are two other important prebiotic molecules present at a comparable (1 percent) level. Attention is drawn to similarities between these compositions and those inferred for the primordial earth.

Delsemme, A. H.

1984-01-01

93

Forensic Chemistry  

NASA Astrophysics Data System (ADS)

Forensic chemistry is unique among chemical sciences in that its research, practice, and presentation must meet the needs of both the scientific and the legal communities. As such, forensic chemistry research is applied and derivative by nature and design, and it emphasizes metrology (the science of measurement) and validation. Forensic chemistry has moved away from its analytical roots and is incorporating a broader spectrum of chemical sciences. Existing forensic practices are being revisited as the purview of forensic chemistry extends outward from drug analysis and toxicology into such diverse areas as combustion chemistry, materials science, and pattern evidence.

Bell, Suzanne

2009-07-01

94

CLUSTER CHEMISTRY  

SciTech Connect

Metal cluster chemistry is one of the most rapidly developing areas of inorganic and organometallic chemistry. Prior to 1960 only a few metal clusters were well characterized. However, shortly after the early development of boron cluster chemistry, the field of metal cluster chemistry began to grow at a very rapid rate and a structural and a qualitative theoretical understanding of clusters came quickly. Analyzed here is the chemistry and the general significance of clusters with particular emphasis on the cluster research within my group. The importance of coordinately unsaturated, very reactive metal clusters is the major subject of discussion.

Muetterties, Earl L.

1980-05-01

95

Computational Chemistry for Chemistry Educators  

NSDL National Science Digital Library

This is a 15-session course on the technologies, techniques, and tools of computational chemistry. By using the same computational tools as research computational chemists, educators will have the opportunity to study chemistry in a manner very different than traditional teaching and education in chemistry.

Institute, Shodor C.

96

CLOUD DROPLET NUCLEATION AND ITS CONNECTION TO AEROSOL PROPERTIES  

E-print Network

CLOUD DROPLET NUCLEATION AND ITS CONNECTION TO AEROSOL PROPERTIES STEPHEN E. SCHWARTZ Environmental Chemistry Division, Brookhaven National Laboratory, Upton NY 11973 USA Abstract - Anthropogenic aerosols

Schwartz, Stephen E.

97

for Undergraduate CHEMISTRY MAJORS  

E-print Network

Technology, Colloid and Surface Chemistry, Consumer Products, Food and Flavor Chemistry, Forensic ChemistryHANDBOOK for Undergraduate CHEMISTRY MAJORS DEPARTMENT OF CHEMISTRY Fall 2010 #12;#12;TABLE OF CONTENTS A Career in Chemistry - What It Means ___________________________________________ 4 What do

Stuart, Steven J.

98

Analytical Chemistry  

NSDL National Science Digital Library

This document contains a list of detailed lecture notes covering a wide range of topics including equilibrium, titrations, sample preparation, acids and bases, buffers, spectrophotometry, potentiometry and chromatography. This site is part of a collection of notes from a general chemistry course taught at the State University of West Georgia. This document gives supplementary material that could be useful to intermediate chemistry majors in an analytical chemistry course or new faculty developing a course.

Henderson, David E.

2011-06-01

99

Doing Chemistry  

NSDL National Science Digital Library

This website includes over 150 chemistry experiments in the following areas: Atomic Structure, Bonding, Chemical Reactions, Colligative Properties, Condensed States, Electrochemistry, Equilibrium Gases, Instrumentation, Limiting Reactant and more.

Brooks, David W.

2010-05-25

100

Chemistry Notes  

ERIC Educational Resources Information Center

Twelve new chemistry expermiments are described. Broad areas covered include atomic structure, solubility, gaseous diffusion, endothermic reactions, alcohols, equilibrium, atomic volumes, and some improvised apparatus. (PS)

School Science Review, 1972

1972-01-01

101

Coral Reef Connections  

NSDL National Science Digital Library

Coral Reef Connections explores the different reef zones of the Great Barrier Reef in Australia, the biodiversity that has evolved there, and the interactions between the many species, their environment, and each other. Users can navigate through a virtual "dive" on the reef, select various organisms, and view the types of relationships they have with each other. Links to related topics and web activities are included.

102

Chemistry Notes.  

ERIC Educational Resources Information Center

Outlines laboratory procedures, demonstrations, teaching suggestions, and content information related to chemistry. Topics include polarizing power; calorimetry and momentum; microcomputers in school chemistry; a constant-volume dispenser for liquids, floating magnets, and crystal lattices; preparation of chromium; and solvent polarity and…

School Science Review, 1981

1981-01-01

103

Making Connections  

ERIC Educational Resources Information Center

Effective teaching includes enabling learners to make connections within mathematics. It is easy to accord with this statement, but how often is it a reality in the mathematics classroom? This article describes an approach in "connecting equivalent" fractions and whole number operations. The authors illustrate how a teacher can combine a common…

Pien, Cheng Lu; Dongsheng, Zhao

2011-01-01

104

Regular connections among generalized connections  

NASA Astrophysics Data System (ADS)

The properties of the space A of regular connections as a subset of the space ? of generalized connections in the Ashtekar framework are studied. For every choice of compact structure group and smoothness category for the paths, it is determined whether A is dense in ? or not. Moreover, it is proven that A has Ashtekar-Lewandowski measure zero for every non-trivial structure group and every smoothness category. The analogous results hold for gauge orbits instead of connections.

Fleischhack, Christian

2003-09-01

105

ORGANIC CHEMISTRY UCLA Organic Chemistry Faculty  

E-print Network

ORGANIC CHEMISTRY UCLA Organic Chemistry Faculty perform research in molecular machines, exotic CHEMISTRY FACULTY RESEARCH INTERESTS Anne M. Andrews, Professor-in-Residence: Understanding how areas of interest include cross- coupling reactions, green chemistry, heterocycle synthesis, and natural

Levine, Alex J.

106

Teaching Chemistry Using the Movie "Apollo 13."  

ERIC Educational Resources Information Center

Offers suggestions for incorporating topics that relate to the Apollo 13 space mission into a chemistry course. Discusses connections between the study of chemistry and space exploration, including fuels and oxidants used, reasons for an oxygen tank rupture, and lithium hydroxide-containing carbon dioxide filters. Contains 11 references. (WRM)

Goll, James G.; Woods, B. J.

1999-01-01

107

"Doing Chemistry."  

ERIC Educational Resources Information Center

Summarizes papers presented at the Sixth Biennial Conference on Chemical Education in the area of "Doing Chemistry," i.e., demonstrations and student experiments. A bibliography of 21 presented papers in this area is attached. (CS)

Journal of Chemical Education, 1981

1981-01-01

108

Cooperative Chemistry  

NSDL National Science Digital Library

Concept mapping in the organic chemistry laboratory can supplant cookbook activities with higher cognitive exercises. The common thread of most organic lab experiments is the synthesis, isolation, purification, and characterization of a carbon compound. T

Gahr, Allan A.

2003-02-01

109

Catalytic Chemistry.  

ERIC Educational Resources Information Center

Describes an approach for making chemistry relevant to everyday life. Involves the study of kinetics using the decomposition of hydrogen peroxide by vegetable juices. Allows students to design and carry out experiments and then draw conclusions from their results. (JRH)

Borer, Londa; And Others

1996-01-01

110

Chemistry Notes.  

ERIC Educational Resources Information Center

Describes equipment, activities, and experiments useful in chemistry instruction, including among others, a rapid method to determine available chlorine in bleach, simple flame testing apparatus, and a simple apparatus demonstrating the technique of flash photolysis. (SK)

School Science Review, 1980

1980-01-01

111

Chemistry Notes.  

ERIC Educational Resources Information Center

Describes 13 activities, experiments and demonstrations, including the preparation of iron (III) chloride, simple alpha-helix model, investigating camping gas, redox reactions of some organic compounds, a liquid crystal thermometer, and the oxidation number concept in organic chemistry. (JN)

School Science Review, 1981

1981-01-01

112

Radioanalytical Chemistry  

NSDL National Science Digital Library

This website provides a course on the use of radionuclides in analytical chemistry. Types of radioactive decay are discussed as well as the techniques of scintillation counting, neutron activation analysis, and gamma spectroscopy.

Hardy, James K.

2010-07-01

113

Making connections  

PubMed Central

Deleting a gene called Sema5A, which has been linked to autism in humans, causes neurons to form more connections in mice, and also alters how these mutant mice interact with other mice. PMID:25407769

Kenney, Justin W

2014-01-01

114

Chemistry Tutorials  

NSDL National Science Digital Library

The California State University Stanislaus developed these interactive chemistry Web tutorials to assist college students in mass spectrometry, proton NMR chemical shifts, and more. With the many animations and figures, visitors will find assistance with the subtraction and absorption of light and with infrared absorption frequencies for numerous compounds. The titration tutorials simulate laboratory experiments without the hazards of dealing with chemicals. Students will also find a very informative lesson describing how to use Excel to record and analyze their chemistry data.

115

CHEMISTRY 320 PHYSICAL CHEMISTRY I  

E-print Network

), physical transformations (including phase transitions), solutions, electrochemistry, and chemical kinetics of the physical principles of chemistry. Goals/ Objectives: CHEM 320 presents chemical principles from, internal energy, enthalpy and entropy), chemical thermodynamics (Gibbs free energy and chemical potentials

Findley, Gary L.

116

Computational Chemistry for Chemistry Educators  

NSDL National Science Digital Library

In this paper we describe an ongoing project where the goal is to develop competence and confidence among chemistry faculty so they are able to utilize computational chemistry as an effective teaching tool. Advances in hardware and software have made research-grade tools readily available to the academic community. Training is required so that faculty can take full advantage of this technology, begin to transform the educational landscape, and attract more students to the study of science.

Sendlinger, Shawn C.; Metz, Clyde R.

117

Windows into Deep Subsurface Chemistry Near and Far (Invited)  

NASA Astrophysics Data System (ADS)

Earth's deep biosphere may be just one of many deep biospheres within our solar system. But for many of these worlds we are, and will be for the near future, limited to observations and measurements of the surface chemistry to serve as a window into any activity related to geochemical or biochemical disequilibrium. Mars, Europa, and Enceladus serve as three examples of worlds where the surface of the lithospheres (one silicate, the other two of water ice) may connect to rich subsurface aqueous chemical environments. Here I will present results from recent observations of the surface chemistry of Europa and the organic- and salt-rich plume material of Enceladus. Interestingly, for at least the case of Europa, the redox chemistry of the deep lithosphere may be inverted when compared to that of the Earth. On Earth, the rocks of the lithosphere serve as the reductant and the fluid and dissolved gases provide the oxidants. On Europa, the rock of its lithosphere is water ice that is likely permeated with oxygen, peroxides, and sulfate compounds. The lithosphere may be reductant limited. Coupled with these observations I will also present recent results from work on Arctic methane seeps and Hadal zone observations of biological and geochemical processes. These environments provide a unique window into the deep biosphere and illuminate some of the challenges of differentiating biochemical products from geochemical products.

Hand, K. P.

2013-12-01

118

Humanizing Chemistry Education: From Simple Contextualization to Multifaceted Problematization  

ERIC Educational Resources Information Center

Chemistry teaching has traditionally been weakly connected to everyday life, technology, society, and history and philosophy of science. This article highlights knowledge areas and perspectives needed by the humanistic (and critical-reflexive) chemistry teacher. Different humanistic approaches in chemistry teaching, from simple contextualization…

Sjöström, Jesper; Talanquer, Vicente

2014-01-01

119

Numerical simulations of turbulent premixed H2/O2/N2 flames with complex chemistry  

NASA Technical Reports Server (NTRS)

Premixed stoichiometric H2/O2/N2 flames propagating in two-dimensional turbulence were studied using direct numerical simulation (simulations in which all fluid and thermochemical scales are fully resolved) including realistic chemical kinetics and molecular transport. Results are compared with earlier zero-chemistry (flame sheet) and one-step chemistry simulations. Consistent with the simpler models, the turbulent flame with realistic chemistry aligns preferentially with extensive strain rates in the tangent plane and flame curvature probability density functions are close to symmetric with near-zero means. By contrast to simple-chemistry results with non-unity Lewis numbers (ratio of thermal to species diffusivity), local flame structure does not correlate with curvature but rather with tangential strain rate. Turbulent straining results in substantial thinning of the flame relative to the steady unstrained laminar case. Heat release and H2O2 contours remain thin and connected ('flamelet-like') while species including H-atom and OH are more diffuse. Peak OH concentration occurs well behind the peak heat-release zone. The feasibility of incorporating realistic chemistry into full turbulence simulations to address issues such as pollutant formation in hydrocarbon-air flames is suggested.

Baum, M.; Poinsot, T. J.; Haworth, D. C.

1992-01-01

120

Fault zone hydrogeology  

NASA Astrophysics Data System (ADS)

Deformation along faults in the shallow crust (< 1 km) introduces permeability heterogeneity and anisotropy, which has an important impact on processes such as regional groundwater flow, hydrocarbon migration, and hydrothermal fluid circulation. Fault zones have the capacity to be hydraulic conduits connecting shallow and deep geological environments, but simultaneously the fault cores of many faults often form effective barriers to flow. The direct evaluation of the impact of faults to fluid flow patterns remains a challenge and requires a multidisciplinary research effort of structural geologists and hydrogeologists. However, we find that these disciplines often use different methods with little interaction between them. In this review, we document the current multi-disciplinary understanding of fault zone hydrogeology. We discuss surface- and subsurface observations from diverse rock types from unlithified and lithified clastic sediments through to carbonate, crystalline, and volcanic rocks. For each rock type, we evaluate geological deformation mechanisms, hydrogeologic observations and conceptual models of fault zone hydrogeology. Outcrop observations indicate that fault zones commonly have a permeability structure suggesting they should act as complex conduit-barrier systems in which along-fault flow is encouraged and across-fault flow is impeded. Hydrogeological observations of fault zones reported in the literature show a broad qualitative agreement with outcrop-based conceptual models of fault zone hydrogeology. Nevertheless, the specific impact of a particular fault permeability structure on fault zone hydrogeology can only be assessed when the hydrogeological context of the fault zone is considered and not from outcrop observations alone. To gain a more integrated, comprehensive understanding of fault zone hydrogeology, we foresee numerous synergistic opportunities and challenges for the discipline of structural geology and hydrogeology to co-evolve and address remaining challenges by co-locating study areas, sharing approaches and fusing data, developing conceptual models from hydrogeologic data, numerical modeling, and training interdisciplinary scientists.

Bense, V. F.; Gleeson, T.; Loveless, S. E.; Bour, O.; Scibek, J.

2013-12-01

121

Radiation Chemistry  

NASA Astrophysics Data System (ADS)

Ionizing radiation causes chemical changes in the molecules of the interacting medium. The initial molecules change to new molecules, resulting in changes of the physical, chemical, and eventually biological properties of the material. For instance, water decomposes to its elements H2 and O2. In polymers, degradation and crosslinking take place. In biopolymers, e.g., DNS strand breaks and other alterations occur. Such changes are to be avoided in some cases (radiation protection), however, in other cases they are used for technological purposes (radiation processing). This chapter introduces radiation chemistry by discussing the sources of ionizing radiation (radionuclide sources, machine sources), absorption of radiation energy, techniques used in radiation chemistry research, and methods of absorbed energy (absorbed dose) measurements. Radiation chemistry of different classes of inorganic (water and aqueous solutions, inorganic solids, ionic liquids (ILs)) and organic substances (hydrocarbons, halogenated compounds, polymers, and biomolecules) is discussed in concise form together with theoretical and experimental backgrounds. An essential part of the chapter is the introduction of radiation processing technologies in the fields of polymer chemistry, food processing, and sterilization. The application of radiation chemistry to nuclear technology and to protection of environment (flue gas treatment, wastewater treatment) is also discussed.

Wojnárovits, L.

122

Chemistry & Industry  

NSDL National Science Digital Library

Chemistry and Industry Magazine, a bimonthly product of the Society of Chemical Industry, provides selected full-text articles from the print magazine in the areas of news, commentary, features, latest results from chemical literature, and highlights from the latest European patents. In addition, there is a searchable and browsable archive of past issues, a daily news section, and searchable jobs and meetings databases. The Society of Chemical Industry is "an international association of about 6000 members aimed at furthering applied chemistry." One of the highlights of its web site is its publication section, where, under "electronic publications," readers can find updated daily news, jobs and meetings listings on chemistry, pharmaceuticals, biotechnology, and the environment.

2006-01-11

123

Position: Assistant Professor of Chemistry, Physical Chemistry  

E-print Network

John Grey Position: Assistant Professor of Chemistry, Physical Chemistry Email: jkgrey@unm.edu Phone: 505.277.1658; Fax: 505.277.2609 Office: Clark Hall B70 Homepage: http://chemistry.unm.edu/faculty_web/jgrey Education B.S. in Chemistry, 1999, Michigan Technological University, Houghton, MI Ph.D. in Chemistry

124

Wildlife Connectivity Across Utah’s Highways  

E-print Network

When wildlife habitat is bisected by highways, animals stillanimals that may be ready to jump in front of them. Often, the reason wildlifewildlife crossing of highways. These are especially important in critical and high priority connectivity zones where animals

West, Paul W.

2007-01-01

125

Getting Connected  

ERIC Educational Resources Information Center

That the world outside schools is changing faster than ever is old news. Unfortunately, that the world "inside" schools is changing at a glacial pace is even older news. As school leaders, principals have an important choice to make as they move into the second decade of the 21st century. School leaders have a moral obligation to connect and…

Larkin, Patrick

2011-01-01

126

College Connection  

ERIC Educational Resources Information Center

This article describes Oakwood City School District's College Connection Study, which is now in its eighth year. The purpose of the study is to help the educators in the district learn how to effectively prepare students for success in the colleges of their choice. Teachers, administrators, and other staff members travel to colleges to conduct…

Hewitt, Kimberly Kappler; Scalzo, Mary Jo

2012-01-01

127

Get Connected  

ERIC Educational Resources Information Center

Technology can be both a blessing and a curse in the classroom. Although technology can provide greater access to information and increase student engagement, if screen time replaces time spent outside, then students stand to lose awareness and connectivity to the surrounding natural environment. This article describes how Google Earth can foster…

Horton, Jessica; Hagevik, Rita; Adkinson, Bennett; Parmly, Jilynn

2013-01-01

128

Building Connections  

NSDL National Science Digital Library

This learning activity guides students to make connections between linear and polynomial functions through exploring their graphs. This lesson plan is outlined with step-by-step directions for teachers to follow as well as guiding questions and assessment options to ensure ample feedback on students' progress and mastery levels.

Nctm

2012-08-01

129

/6582 Biophysical Chemistry Fall Biophysical Chemistry  

E-print Network

/6582 Biophysical Chemistry Fall 1 CHEM /6582 Biophysical Chemistry Course meeting place concepts in biophysical chemistry. You will develop an understanding of how thermodynamics, kinetics literature concerning the application of biophysical techniques to characterize biological molecules

Sherrill, David

130

Part 2. Three Primary Areas of Theoretical Chemistry Chapter 5. An Overview of Theoretical Chemistry  

E-print Network

as solid, liquid, and plastic materials comprised of molecules. All such forms of molecular matter are what.9871.987 Figure 5.1 The arginine molecule in its non-zwitterion form with dotted hydrogen bond. The connectivity is Theoretical Chemistry About? The science of chemistry deals with molecules including the radicals, cations

Simons, Jack

131

Green Chemistry  

NSDL National Science Digital Library

This audio segment from PRI's The World Science Podcast explores the science of Green Chemistry. Hear about companies that are developing greener chemicals, and learn why they are fast becoming an attractive alternative for the multi-billion dollar chemical industry.

Foundation, Wgbh E.

2010-02-12

132

Confectionary Chemistry.  

ERIC Educational Resources Information Center

Presents activities and demonstrations that enable teachers to use various types of confections as tactile experiences to spark chemistry students' interest and generate enthusiasm for learning. Presents uses of candy in teaching about atomic structure, spontaneous nuclear decay, chemical formulas, fractoluminescence, the effect of a molecular…

Levine, Elise Hilf

1996-01-01

133

Bad Chemistry  

NSDL National Science Digital Library

This site from the Princeton Section of the American Chemical Society consists of articles about common chemical misconceptions along with examinations of the scientific explanation. The purpose of this page is to reveal common misconceptions in the field of Chemistry. The intended audience is secondary school students and their teachers. The page is at present just beginning, and additions are welcome.

Lehmann, Kevin; University, Princeton

134

Atmospheric Chemistry  

NSDL National Science Digital Library

This set of links provides access to resources on atmospheric chemistry, especially acid deposition, air pollution, and air quality. The sites include personal and government pages, universities and research groups, non-governmental organizations and meetings, and products and services. There are also links to related search topics.

135

Definition Chemistry  

E-print Network

1 · Definition · Chemistry · Factors · Mitigation MinE 422 Acid Rock Drainage Online `Gard Guide is a great source of information Terminology · acid rock drainage (ARD) · saline drainage (SD) · acid mine or acid and metalliferous drainage (AMD) · mining influenced water (MIW) · neutral mine drainage (NMD

Boisvert, Jeff

136

Nuclear Chemistry  

NSDL National Science Digital Library

This page, from the University of North Carolina - Chapel Hill Chemistry Fundamentals program and the Shodor Education Foundation, discusses five different types of radioactive decay: alpha, beta negative, gamma, positron emission, and electron capture. After examining the numerous equations, students can test their dating skills by solving three practice problems. Solutions are included.

2008-03-12

137

Analytical Chemistry  

NSDL National Science Digital Library

This site features lecture notes for first and second level courses in analytical chemistry. Topics include titrations, gravimetry, kinetics and electrochemistry (redox). Potentiometry, coulometry, voltammetry, spectroscopic and separation methods are presented as well, and are illustrated with QuickTime animations.

Hardy, James K.

2011-03-30

138

Chemistry Notes.  

ERIC Educational Resources Information Center

Describes some laboratory apparatus, chemistry experiments and demonstrations, such as a Kofler block melting point apparatus, chromatographic investigation of the phosphoric acid, x-ray diffraction, the fountain experiment, endothermic sherbet, the measurement of viscosity, ionization energies and electronic configurations. (GA)

School Science Review, 1978

1978-01-01

139

Chemistry Newsletter # 7  

NSF Publications Database

... the Division of Chemistry Don Burland to retire from the Division of Chemistry Mathematical and ... WITHIN THE DIVISION OF CHEMISTRY The Division of Chemistry has completed its national search and is ...

140

CHEMISTRY DEPARTMENT HANDBOOKFOR STUDENTS  

E-print Network

/ENVIRONMENTAL, Bachelor of Science in Chemistry with Option in Environmental Chemistry 27 BS CHEM/NANOTECHNOLOGY, Bachelor in Biochemistry 85 Minor in Environmental Chemistry 86 1st, 2nd and 3rd Floor Maps of the Chemistry Rooms

Hardy, Christopher R.

141

Connecting Organelles  

NSDL National Science Digital Library

This perspective discusses a recent report demonstrating the existence of a complex of proteins connecting mitochondria to the endoplasmic reticulum. Mitochondria are organelles that form a dynamic network in most eukaryotic cell types. Although originally considered to be semi-autonomous powerhouses, they are intimately connected to the rest of the cell through metabolic and signaling pathways, and play a central role in programmed cell death (apoptosis). Sites of close proximity between mitochondria and the tubular network of the endoplasmic reticulum have long been known from electron micrographs, yet their molecular nature remained elusive. In a recent report, Kornmann et al. show that a complex of proteins that controls mitochondrial shape and protein biogenesis bridge these two organelles.

Nils Wiedemann (Universität Freiburg;Institut für Biochemie und Molekularbiologie, Zentrum für Biochemie und Molekulare Zellforschung and Centre for Biological Signalling Studies); Chris Meisinger (Universität Freiburg;Institut für Biochemie und Molekularbiologie, Zentrum für Biochemie und Molekulare Zellforschung and Centre for Biological Signalling Studies); Nikolaus Pfanner (Universität Freiburg;Institut für Biochemie und Molekularbiologie, Zentrum für Biochemie und Molekulare Zellforschung and Centre for Biological Signalling Studies)

2009-07-24

142

Making Connections  

NSDL National Science Digital Library

This article examines the reading comprehension strategy known as making connections. It involves linking what is being read (the text) to what is already known (schema, or background knowledge). The author provides links to four online resources that will help readers use the strategy in K-5 science and literacy classrooms. The article appears in the free, online magazine Beyond Weather and the Water Cycle, which integrates science and literacy instruction.

Fries-Gaither, Jessica

2011-12-01

143

Dead Zones  

NSDL National Science Digital Library

The Earth currently has more than 400 "dead zones"--marine expanses covering hundreds, or even thousands, of square miles that periodically become virtually lifeless. Explore the surprising causes of Oregon's dead zones, and the pioneering methods used to research them.

144

UCLA CHEMISTRY & BIOCHEMISTRY  

E-print Network

UCLA CHEMISTRY & BIOCHEMISTRY ORIENTATION HANDBOOK 2012-2013 #12;Table of Contents Introduction .............................................................................................................................................2 Chemistry & Biochemistry Undergraduate Office ................................................................................................................................................4 Biochemistry

Levine, Alex J.

145

Chemistry 675 Advanced Organic Chemistry  

E-print Network

. Chisholm 4-006 CST jdchisho@syr.edu 443-6894 Office Hours: By appointment, between 9 AM and 5 PM Course in my office (CST 4-006) or my mailbox in the chemistry office (CST 1-014). Late problem sets will have

Doyle, Robert

146

Environmental Chemistry II (Atmospheric Chemistry)  

E-print Network

Seinfeld, J. H. and Pandis, S. N. Atmospheric Chemistry and Physics: From Air Pollution to Climate Change Monday, December 16 at 4:00 p.m. (Climate Change and comprehensive) Exams I and II are planned as two for undergraduate students than graduate students. Grading Scale 85 -100% at least an A- 75 - 84% at least a B- 65

Dibble, Theodore

147

In situ experiment of ontogenetic variability in the otolith chemistry of Stegastes partitus  

Microsoft Academic Search

Otolith chemistry can be used to assess pelagic larval fish connectivity by comparing spatially variable otolith edge chemistry (corresponding to the site of collection) to otolith core chemistry (corresponding to the site of hatching). However, because the otolith’s edge and core represent different life stages, the deposition of elements may differ, thus complicating direct comparisons of edge and core chemistry

P. M. Chittaro; J. D. Hogan; J. Gagnon; B. J. Fryer; P. F. Sale

2006-01-01

148

Surface chemistry of Cr(III) oxidation and precipitation on Mn(IV) oxides Gautier Landrot, landrot@udel.edu, Department of Plant and Soil Sciences and Center for Critical Zone Research, University of  

E-print Network

Surface chemistry of Cr(III) oxidation and precipitation on Mn(IV) oxides GEOC 29 Gautier Landrot, Newark, DE 19717. The main soil components that oxide Cr(III) to the more hazardous chromium species Cr(VI) are manganese oxides. With hydrous manganese oxide (HMO) and birnessite, Cr(III) may react in two steps: a first

Sparks, Donald L.

149

Fluid pressure and flow at great depth in the continental crust. A discussion in relation to topography, temperature and salinity distribution using as an example the KTB Fault Zones in connection with the Eger Rift Hot Spot  

Microsoft Academic Search

Hydraulic investigations in and between the two KTB boreholes have shown that groundwater flow is possible at great depth in the crystalline crust. Remarkable permeability was found particularly in the SE1 and SE2 fault zones. The results from a long term pump and injection test, and the related three-dimensional groundwater modelling (Graesle et al., 2006), document the existence of a

W. Kessels; S. Kuhlmann; X. Li

2006-01-01

150

Environmental Chemistry  

NSDL National Science Digital Library

In this activity with several mini experiments, learners explore the chemistry that helps scientists learn about the environment and how they can help save it. Learners will determine if pollutants that have entered the ground water can also enter plants. Then, learners examine fossils to see if any changes have occurred over time in a particular species of sea mollusks. Finally, learners act as chemists to recycle paper by making paper from toilet paper.

Shaw, Maisie; Gomez, Maria

2010-01-01

151

Circumstellar chemistry  

NASA Technical Reports Server (NTRS)

Recent theoretical studies of circumstellar chemistry are discussed for both red-giant and protostellar winds. The generalized photochemical model is able to account for the recently discovered silicon-bearing molecules in the prototypical, C-rich, AGB star IRC + 10216. The surprising occurrence of CO in protostellar winds that are largely atomic is interpreted to be the result of the high density and the rapid decrease of the temperature with distance that is expected for such winds.

Glassgold, A. E.; Mamon, G. A.

1991-01-01

152

Chemistry 411/611 Inorganic Chemistry (2011)  

E-print Network

1 Chemistry 411/611 Inorganic Chemistry (2011) Instructor: Assistant Professor Mathew M. Maye Chemistry", 5th Edition, Freeman Press. Available at SU bookstore. The solution manual is optional. (Suggested for CHE611 Students pursuing Inorganic) Huheey, "Inorganic Chemistry: Principles of Structure

Mather, Patrick T.

153

Lycos Zone  

NSDL National Science Digital Library

In the tradition of Yahooligans (reviewed in the March 22, 1996 Scout Report) and other so-called "green spaces," Lycos has created a new online safe haven for young users which is fairly self-contained, with the exception of the advertisements. (In response to criticisms regarding aggressive marketing to children at similar sites, Lycos claims that the ads are clearly marked and will not collect any personal information.) The site is composed of four sections: the Fun and Games Zone, the Homework Zone, the New and Cool Zone, and an area for parents and teachers. The first two sections are fairly deep, with numerous resources and activities aimed at various age levels. Some links in the Homework Zone lead users outside the site, but they are first presented with a gateway page informing them that they are leaving and offering advice on not divulging personal information.

154

Heterogeneity in ground water-surface water interactions in the hyporheic zone of a salmonid spawning stream  

NASA Astrophysics Data System (ADS)

Spatial and temporal variability in ground water-surface water interactions in the hyporheic zone of a salmonid spawning stream was investigated. Four locations in a 150-m reach of the stream were studied using hydrometric and hydrochemical tracing techniques. A high degree of hydrological connectivity between the riparian hillslope and the stream channel was indicated at two locations, where hydrochemical changes and hydraulic gradients indicated that the hyporheic zone was dominated by upwelling ground water. The chemistry of ground water reflected relatively long residence times and reducing conditions with high levels of alkalinity and conductivity, low dissolved oxygen (DO) and nitrate. At the other locations, connectivity was less evident and, at most times, the hyporheic zone was dominated by downwelling stream water characterized by high DO, low alkalinity and conductivity. Substantial variability in hyporheic chemistry was evident at fine (<10 m) spatial scales and changed rapidly over the course of hydrological events. The nature of the hydrochemical response varied among locations depending on the strength of local ground water influence. It is suggested that greater emphasis on spatial and temporal heterogeneity in ground water-surface water interactions in the hyporheic zone is necessary for a consideration of hydrochemical effects on many aspects of stream ecology. For example, the survival of salmonid eggs in hyporheic gravels varied considerably among the locations studied and was shown to be associated with variation in interstitial chemistry. River restoration schemes and watershed management strategies based only on the surface expression of catchment characteristics risk excluding consideration of potentially critical subsurface processes.

Malcolm, I. A.; Soulsby, C.; Youngson, A. F.; Petry, J.

2003-02-01

155

Business Connections  

NSDL National Science Digital Library

The New York Times On the Web has recently added a new section, Business Connections, to its highly selective collection of Web links. The section provides one-stop shopping for the most authoritative business-related network resources available. For example, the Markets listings include links to all U.S. exchanges, foreign exchanges, and selected market information sites. The Investing section offers a dozen links to general information and a half-dozen more to the top investment companies and trading services such as Merrill Lynch, Paine Webber, and Charles Schwab. Company Information provides traditional sources such as Dun & Bradstreet along with the Web 100--the top US and international companies on the Web. A good selection of business directories is included, in addition to separate listings for business and financial news, banking & finance, and government & public organizations. Note that free registration to The New York Times On the Web is required before entry into any of their pages.

1996-01-01

156

Advances in applied radiation chemistry  

NASA Astrophysics Data System (ADS)

Applied radiation chemistry seems to take position between pure radiation chemistry and radiation processing. APPLIED means, by the dictionary such as Larouse, "related or turned to practical knowledge or use" and is differentiated from the pure one and its application. Pure science, however, stretches on a continuous line and becomes "turned to practical use" in the way of research, frequently far to the application over through the applied one. These continuities between the pure, the applied and the application of sciences may easily be connected over each other, sometimes by a scientific enthusiasm. Here the importance is correct distinction, but not simple discrimination. To-day in my presentation I would like to put main emphasis on APPLIED radiation chemistry but not exclude out simply PURE radiation chemistry and radiation PROCESSING. In addition, the word of ADVANCES means the progresses in the past, including some expectations in the future. The expectation is looked forward by the selection, connected with future applicability and with strongly individual character. The topics related to advances here in my talk shall be focused mainly for the works investigated in Japan Atomic Energy Research Institute (JAERI) Laboratories from standpoint of my short experience.

Okamura, Seizo

157

School of Chemistry CHEM3100: Chemistry at a Molecular Level  

E-print Network

School of Chemistry CHEM3100: Chemistry at a Molecular Level Tutorial Groups 2013/14 Name Programme Tutor Ahmed, Zacher Medicinal Chemistry Arif, Saboor Chemistry Bagnall, Samuel Chemistry Barbara, David Chemistry Beaumont, Nicholas Chemistry Quinn, Michael J Chemistry Bennett, Matthew Chemistry Booth, Natalie

Rzepa, Henry S.

158

Industrial Chemistry  

NSDL National Science Digital Library

This Web site addresses Professor Dr. J. Gmehling's research group activities in "the synthesis and design of chemical processes with an emphasis on thermal separation processes." Ranging from the development of thermodynamic models to the construction of software tools and data banks, their research at the University of Oldenburg, covers a broad range in the field of Industrial Chemistry. Students and educators can view informative figures and images such as the Isothermal Flow Calorimeter and the Gas-Liquid Chromatography. Users can download the free software, Dortmund Data Bank (DDB), which searches the literature for experimental information.

159

(Pesticide chemistry)  

SciTech Connect

This report summarizes a trip by L. W. Barnthouse of the Environmental Sciences Division (ESD), Oak Ridge National Laboratory (ORNL), to Hamburg, Federal Republic of Germany (FRG), where he participated in the 7th International Congress of Pesticide Chemistry. He chaired a workshop on experimental systems for determining effects of pesticides on nontarget organisms and gave an oral presentation at a symposium on pesticide risk assessment. Before returning to the United States, Dr. Barnthouse visited the Netherlands Institute for Sea Research in Texel, the Netherlands.

Barnthouse, L.W.

1990-09-04

160

Chemistry References  

NSDL National Science Digital Library

This site highlights chemistry resources that we consider essentiala fabulous periodic table, a database of chemical compounds, a set of demonstrations of chemical reactions that are just plain spectacular, and, dont forget, laboratory safety. Articles from the web sites Whats That Stuff? and Science News for Kids can be used as supplemental reading all through the year. This site explains the history and characteristics of over 20 substances, such as sunscreen, Cheese Whiz, baseballs, fluoride, new car smell, ink, lipstick, bug spray, and licorice. The individual articles are nontechnical for the most part and are presented in a fun way that readers will enjoy. Also, if a ...

Kim

2007-08-08

161

NO PRINTING ZONE NO PRINTING ZONE NO PRINTING ZONE NO PRINTING ZONE NO PRINTING ZONE NO PRINTING ZONE NO PRINTING ZONE NO PRINTING ZONE NO PRINTING ZONE NO PRINTING ZONE NO PRINTING ZONE NO PRINTING ZONE NO PRINTING ZONE NO PRINTING ZONE NO PRINTING ZONE  

E-print Network

N O P R I N TI N G Z O N E N O P R I N TI N G Z O N E N O P R I N TI N G Z O N E NO PRINTING ZONE NO PRINTING ZONE NO PRINTING ZONE NO PRINTING ZONE NO PRINTING ZONE NO PRINTING ZONE NO PRINTING ZONE NO PRINTING ZONE NO PRINTING ZONE NO PRINTING ZONE NO PRINTING ZONE NO PRINTING ZONE NO PRINTING ZONE

Kainen, Paul C.

162

CHEMISTRY CURRICULUM SEMESTER I  

E-print Network

CHEMISTRY CURRICULUM SEMESTER ­ I Chemistry-I: Physical principles (2:1) Atomic structure-state approximation, Arrhenius equation and collision theory and catalysis. SEMESTER ­ II Chemistry-II: Structure orbital theory: polyatomic molecules - Walsh diagram; Main group chemistry: periodic properties, chemistry

Srinivasan, N.

163

Dead Zone  

NSDL National Science Digital Library

In this video segment adapted from the independent film Big River: A King Corn Companion, the filmmakers explain how agricultural runoff from the Midwest has contributed to a massive "dead zone" in the Gulf of Mexico. A cornfield treated with conventional chemical fertilizer promises a bumper crop, but chemical runoff from the farm enters the Iowa River, eventually draining into the Mississippi River and the Gulf of Mexico. In the Gulf, these dissolved nutrients allow algae to flourish. The algae's decay depletes the water of oxygen, creating a dead zone where shrimp and fish are starved of oxygen and die. A background essay, discussion questions, and standards correlations are also provided.

2010-08-31

164

Breathing zone air sampler  

DOEpatents

A sampling apparatus is provided which comprises a sampler for sampling air in the breathing zone of a wearer of the apparatus and a support for the sampler preferably in the form of a pair of eyeglasses. The sampler comprises a sampling assembly supported on the frame of the eyeglasses and including a pair of sample transport tubes which are suspended, in use, centrally of the frame so as to be disposed on opposite sides of the nose of the wearer and which each include an inlet therein that, in use, is disposed adjacent to a respective nostril of the nose of the wearer. A filter holder connected to sample transport tubes supports a removable filter for filtering out particulate material in the air sampled by the apparatus. The sample apparatus is connected to a pump for drawing air into the apparatus through the tube inlets so that the air passes through the filter.

Tobin, John (Bethel Park, PA)

1989-01-01

165

APPROXIMATE CHEMISTRY 113  

E-print Network

APPROXIMATE CHEMISTRY 113 Spring 2014 Forensic Science Professors James T. Spencer (jtspence SKILLS: Chemistry 113, Forensic Science, is focused upon the application of scientific methods specifically relevant to crime detection and analysis will be presented. No prior chemistry instruction

Doyle, Robert

166

Sawyer Environmental Chemistry Research  

E-print Network

1 Sawyer Environmental Chemistry Research Laboratory Sawyer Environmental Research Center University of Maine #12;2 Mission Statement The Sawyer Environmental Chemistry Research Laboratory is a multi industry. The Sawyer Environmental Chemistry Research Laboratory employs advanced analytical techniques

Thomas, Andrew

167

Why Teach Environmental Chemistry?  

ERIC Educational Resources Information Center

Discusses the importance of teaching environmental chemistry in secondary school science classes, and outlines five examples of environmental chemistry problems that focus on major concepts of chemistry and have critical implications for human survival and well-being. (JR)

Gardner, Marjorie H.

1974-01-01

168

Computational Chemistry List  

NSDL National Science Digital Library

The Computational Chemistry List (CCL) was established as an independent electronic forum for chemistry researchers and educators from around the world. The discussions cover all aspects of computational chemistry.

169

Combustion chemistry  

SciTech Connect

This research is concerned with the development and use of sensitivity analysis tools to probe the response of dependent variables to model input variables. Sensitivity analysis is important at all levels of combustion modeling. This group`s research continues to be focused on elucidating the interrelationship between features in the underlying potential energy surface (obtained from ab initio quantum chemistry calculations) and their responses in the quantum dynamics, e.g., reactive transition probabilities, cross sections, and thermal rate coefficients. The goals of this research are: (i) to provide feedback information to quantum chemists in their potential surface refinement efforts, and (ii) to gain a better understanding of how various regions in the potential influence the dynamics. These investigations are carried out with the methodology of quantum functional sensitivity analysis (QFSA).

Brown, N.J. [Lawrence Berkeley Laboratory, CA (United States)

1993-12-01

170

Environmental chemistry. Seventh edition  

SciTech Connect

This book presents a basic understanding of environmental chemistry and its applications. In addition to providing updated materials in this field, the book emphasizes the major concepts essential to the practice of environmental chemistry. Topics of discussion include the following: toxicological chemistry; toxicological chemistry of chemical substances; chemical analysis of water and wastewater; chemical analysis of wastes and solids; air and gas analysis; chemical analysis of biological materials and xenobiotics; fundamentals of chemistry; and fundamentals of organic chemistry.

Manahan, S.E. [Univ. of Missouri, Columbia, MO (United States)

1999-11-01

171

Science Update: Inorganic Chemistry.  

ERIC Educational Resources Information Center

Describes areas of inorganic chemistry which have changed dramatically in the past year or two, including photochemistry, electrochemistry, organometallic complexes, inorganic reaction theory, and solid state chemistry. (DS)

Rawls, Rebecca

1981-01-01

172

Phase equilibria controls on the chemistry of vent fluids from hydrothermal systems on slow spreading ridges: Reactivity of plagioclase and olivine solid solutions and the pH-silica connection  

NASA Astrophysics Data System (ADS)

Theoretical reaction path models were combined with experimental data to determine fluid-mineral equilibria controls on the chemistry of vent fluids issuing from ultramafic-hosted hydrothermal systems (e.g., Rainbow and Logatchev I) on the slow spreading Mid-Atlantic Ridge. The model involves the incremental reaction of Ca-bearing (evolved seawater) with a calcic-plagioclase and olivine-bearing mineral assemblage, and simulates aspects of an open geochemical system. Incipient reaction predicts Ca removal in exchange for Na, low silica, and high pH. With reaction progress, however, the Na for Ca exchange reaction reverses, while dissolved silica and pH increase and decrease, respectively. The combination of significant dissolved silica (8-9 mmol kg-1), together with elevated dissolved Ca concentrations (60-70 mmol kg-1) coexisting with secondary calc-silicate (tremolite) and Mg-chlorite mineralization, constitutes an important pH buffer. The inherently reducing nature (high H2) of the model system enhances Fe solubility, while low dissolved H2S contributes to elevated dissolved Cu, in keeping with compositional effects reported for Rainbow and Logatchev vent fluids. Data indicate that H2S is controlled at values more than 10 times lower than H2 owing to bornite-chalcocite-magnetite-fluid equilibria. Olivine is not unreactive in the silica-bearing fluid at 400-425°C (500 bars) and is predicted to participate in the formation of calc-silicate, talc, and chlorite alteration phases. Model predictions, however, also indicate metastability of Fe-rich olivine. Experimental studies performed to examine olivine recrystallization reactions in silica bearing fluid indicate preferential dissolution of the forsterite component and precipitation of a more Fe-rich phase along with talc on the surface of the precursor olivine. Additional experimental data are required, however, to better determine the implications of this for the redox and pH evolution of vent fluids at slow spreading mid-ocean ridges.

Seyfried, W. E., Jr.; Pester, Nicholas; Fu, Qi

173

Biology 3515/Chemistry 3515 Biological Chemistry Laboratory  

E-print Network

Biology 3515/Chemistry 3515 Biological Chemistry Laboratory Spring 2013 (Draft Syllabus, 23 August 2012) Course Description and Objectives: This course is intended for students who have taken Biology and function, particularly for enzymes. Prerequisites: Biology 3510 or Chemistry 3510 Instructor: David P

Simons, Jack

174

Fluid pressure and flow at great depth in the continental crust. A discussion in relation to topography, temperature and salinity distribution using as an example the KTB Fault Zones in connection with the Eger Rift Hot Spot.  

NASA Astrophysics Data System (ADS)

Hydraulic investigations in and between the two KTB boreholes have shown that groundwater flow is possible at great depth in the crystalline crust. Remarkable permeability was found particularly in the SE1 and SE2 fault zones. The results from a long term pump and injection test, and the related three-dimensional groundwater modelling (Graesle et al., 2006), document the existence of a large-scale (more than 10 km) hydraulic reservoir in the crystalline crust. According to this calculation, an overpressure of 0.4 MPa can be still be expected in KTB-HB in 2009, 4 years after the end of the injection. The good match with the measurement data confirms groundwater pathways at a scale of more than 10 km. The isotopic water composition recovered from the KTB pilot hole indicates a downward water flow along the SE2 fault zone, which is in contact with the Franconian Line. Moreover, there is a deep upward groundwater flow 60 km away in the western Eger Rift Valley as indicated e.g. by the temperature signature and gas flow observations. Therefore, the demand for fluid mass continuity means that water is being supplied by a downstream groundwater flow, probably from the Franconian Line. The question of potential driving processes must be answered to understand and quantify the flow in the deeper crust at a scale of 10 km to 100 km. The processes must result in a sufficient horizontal pressure gradient to allow groundwater flow at great depth. The density variations of groundwater with depth are highly relevant for the calculation of horizontal pressure differences. The two independent potential fields of gravity and pressure have to be considered. Differentiation into 4 relevant driving processes is required: \\bullet The groundwater surface topography related to the groundwater recharge and mean regional distance between neighbouring valleys \\bullet Geothermal gradient and water density depending on temperature and pressure \\bullet Different salt contents in adjacent geological formations \\bullet Gas content in the water and gas dissolution The interpretation of these processes for the Eger Rift Franconian Line area results in horizontal pressure gradients up to 0.5 MPa/km. With these pressure gradients in deep fault zones similar to the KTB fault zones SE1 and SE2, a remarkable groundwater flow is also possible in the deep crystalline crust. For only a 1 MPa pressure difference between the Franconian Line and the Eger Rift Valley, which lie nearly 60 km apart, we get a tracer velocity of 1.0 to 5.0 m/a (using the Darcy relation and porosities for the hydraulic KTB data). The flow system at great depth is determined mainly by the counteractive forces of salinity and temperature with a nonlinear relation to the water density. References GRAESLE, W., KESSELS, W., KUEMPEL, H.-J., LI, XUAN (2006): HYDRAULIC OBSERVATIONS FROM A ONE YEAR FLUID PRODUCTION TEST IN THE 4000 M DEEP KTB PILOT BOREHOLE. GEOFLUIDS, 6, 8 23 KESSELS, W., KUECK, J. (1995): HYDRAULIC COMMUNICATION IN CRYSTALLINE ROCK BETWEEN THE TWO BOREHOLES OF THE CONTINENTAL DEEP DRILLING PROJECT IN GERMANY. INT. J. ROCK MECH. MIN. SCI. &GEOMECH. ABSTR., 32, 37 47

Kessels, W.; Kuhlmann, S.; Li, X.

2006-12-01

175

Department of Chemistry University of Wisconsin-Madison  

E-print Network

a campus phone, who are you first connected to? What if you are using a cell phone? If your labs://www.chem.wisc.edu/content/safety-information 3) The Chemistry Library Safety page at http://chemistry.library.wisc.edu/resources/#safety The library site contains links to Material Safety Data Sheets (MSDS). You will also need to locate specific

Sheridan, Jennifer

176

Chemistry 20-30: Background, Exemplars and Resources.  

ERIC Educational Resources Information Center

This document is designed to provide practical information for teaching the Chemistry 20-30 Program of Studies. The first section provides an overview of Chemistry 20, explaining the program philosophy and the relationships among science, technology, and society. The use of concept connections and teaching a course around major science themes is…

Hackman, Desiree; And Others

177

Art and Chemistry: Designing a Study-Abroad Course  

ERIC Educational Resources Information Center

Three related courses examining the connection between chemistry and art have been developed for study-abroad programs in Florence, Italy, by faculty members at Gonzaga University and Mount Saint Mary's University. These courses are described with the intent of providing a general framework for the development of chemistry and art courses in other…

Smieja, Joanne A.; D'Ambruoso, Gemma D.; Richman, Robert M.

2010-01-01

178

Trace Chemistry  

NASA Technical Reports Server (NTRS)

The goals of the trace chemistry group were to identify the processes relevant to aerosol and aerosol precursor formation occurring within aircraft gas turbine engines; that is, within the combustor, turbine, and nozzle. The topics of discussion focused on whether the chemistry of aerosol formation is homogeneous or heterogeneous; what species are important for aerosol and aerosol precursor formation; what modeling/theoretical activities to pursue; what experiments to carry out that both support modeling activities and elucidate fundamental processes; and the role of particulates in aerosol and aerosol precursor formation. The consensus of the group was that attention should be focused on SO2, SO3, and aerosols. Of immediate concern is the measurement of the concentration of the species SO3, SO2, H2SO4 OH, HO2, H2O2, O, NO, NO2, HONO, HNO3, CO, and CO2 and particulates in various engines, both those currently in use and those in development. The recommendation was that concentration measurements should be made at both the combustor exit and the engine exit. At each location the above species were classified into one of four categories of decreasing importance, Priority I through IV, as follows: Combustor exit: Priority I species - SO3:SO2 ratio, SO3, SO2, and particulates; Priority II species: OH and O; Priority III species - NO and NO2; and Priority IV species - CO and CO2. For the Engine exit: Priority I species - SO3:SO2 ratio, SO3, SO2,H2SO4, and particulates; Priority II species: OH,HO2, H2O2, and O; Priority III species - NO, NO2, HONO, and HNO3; and Priority IV species - CO and CO2. Table I summarizes the anticipated concentration range of each of these species. For particulate matter, the quantities of interest are the number density, size distribution, and composition. In order to provide data for validating multidimensional reacting flow models, it would be desirable to make 2-D, time-resolved measurements of the concentrations of the above species and, in addition, of the pressure, temperature, and velocity. A near term goal of the experimental program should be to confirm the nonlinear effects of sulfur speciation, and if present, to provide an explanation for them. It is also desirable to examine if the particulate matter retains any sulfur. The recommendation is to examine the effects on SOx production of variations in fuel-bound sulfur and aromatic content (which may affect the amount of particulates formed). These experiments should help us to understand if there is a coupling between particulate formation and SO, concentration. Similarly, any coupling with NOx can be examined either by introducing NOx into the combustion air or by using fuel-bound nitrogen. Also of immediate urgency is the need to establish and validate a detailed mechanism for sulfur oxidation/aerosol formation, whose chemistry is concluded to be homogeneous, because there is not enough surface area for heterogeneous effects. It is envisaged that this work will involve both experimental and theoretical programs. The experimental work will require, in addition to the measurements described above, fundamental studies in devices such as flow reactors and shock tubes. Complementing this effort should be modeling and theoretical activities. One impediment to the successful modeling of sulfur oxidation is the lack of reliable data for thermodynamic and transport properties for several species, such as aqueous nitric acid, sulfur oxides, and sulfuric acid. Quantum mechanical calculations are recommended as a convenient means of deriving values for these properties. Such calculations would also help establish rate constants for several important reactions for which experimental measurements are inherently fraught with uncertainty. Efforts to implement sufficiently detailed chemistry into computational fluid dynamic codes should be continued. Zero- and one-dimensional flow models are also useful vehicles for elucidating the minimal set of species and reactions that must be included in two- and three-dimensional modeling studies.

Radhakrishnan, Krishnan; Whitefield, Philip

1999-01-01

179

An example of inversion in a brittle shear zone  

Microsoft Academic Search

A useful tool to document structural inversion inside a shear zone is the identification of overprinted structures, which can increase the complexity of the internal fabric of shear zones. In the case of thrust faults, shear zones can also be problematic due to the occurrence of structures connected to flexural slip along bedding in the recumbent forelimb. Therefore identification of

S. Bigi

2006-01-01

180

Structuring the Liberal (Arts) Education in Chemistry  

Microsoft Academic Search

Following the tenets of a re-integrative philosophical framework for curriculum design and educational objectives, we provide strategies that describe our effort to change the educational experience of beginning college students in introductory chemistry. We focus on the explicit connection between instructional goals and practices. For instructors and students, whom we view as collaborators in learning, we address how mental models

Brian P. Coppola; Douglas S. Daniels

1996-01-01

181

Chemistry for the Public: Our Challenge  

ERIC Educational Resources Information Center

This article summarizes our experience at McGill University in developing a strong connection not only with a large number of students but also with the general public. This has led to the establishment of a cooperative team to deliver useful information about chemistry and science broadly via the radio, television, the Internet, lectures,…

Harpp, David N.; Fenster, A. E.; Schwarcz, J. A.

2011-01-01

182

Radiation applications of physical chemistry  

NASA Astrophysics Data System (ADS)

Many chemical energy problems have a physical chemistry nature connected with chemical kinetics and thermodynamics. In the USSR, the development in this field is associated with the name of N. N. Semenov, who was involved in a large number of fundamental and applied physical chemistry problems. The new Institute of Energy Problems of Chemical Physics of the USSR Academy of Sciences is dealing with some of them. An overview of the Institute's work on radiation applications is presented. Examples of the use of radiation in the power industry (e.g., in coal gasification), tire production, mechanical joints, metal powder production, and sterilization of pharmaceutical products are given. Methods and problems involved in these applications are discussed and the great potential for extensive utilization is demonstrated.

Talrose, V. L.

1991-05-01

183

Why chemistry? Chemistry is fundamental: it is the enabling  

E-print Network

Chemistry Why chemistry? Chemistry is fundamental: it is the enabling science that underlies many technology. A chemistry degree gives you the understanding to contribute to our future in very topical areas) in Chemistry BSc (Hons) in Chemistry MChem (Hons) in Chemistry (with an industrial placement year) MChem (Hons

Sussex, University of

184

Extreme warming, photic zone euxinia and sea level rise during the Paleocene/Eocene Thermal Maximum on the Gulf of Mexico Coastal Plain; connecting marginal marine biotic signals, nutrient cycling and ocean deoxygenation  

NASA Astrophysics Data System (ADS)

The Paleocene/Eocene Thermal Maximum (PETM, ~56 Ma) was a ~200 kyr episode of global warming, associated with massive injections of 13C-depleted carbon into the ocean-atmosphere system. Although climate change during the PETM is relatively well constrained, effects on marine oxygen and nutrient cycling remain largely unclear. We identify the PETM in a sediment core from the US margin of the Gulf of Mexico. Biomarker-based paleotemperature proxies (MBT/CBT and TEX86) indicate that continental air and sea surface temperatures warmed from 27-29 °C to ~35 °C, although variations in the relative abundances of terrestrial and marine biomarkers may have influenced the record. Vegetation changes as recorded from pollen assemblages supports profound warming. Lithology, relative abundances of terrestrial vs. marine palynomorphs as well as dinoflagellate cyst and biomarker assemblages indicate sea level rise during the PETM, consistent with previously recognized eustatic rise. The recognition of a maximum flooding surface during the PETM changes regional sequence stratigraphic interpretations, which allows us to exclude the previously posed hypothesis that a nearby fossil found in PETM-deposits represents the first North American primate. Within the PETM we record the biomarker isorenieratane, diagnostic of euxinic photic zone conditions. A global data compilation indicates that deoxygenation occurred in large regions of the global ocean in response to warming, hydrological change, and carbon cycle feedbacks, particularly along continental margins, analogous to modern trends. Seafloor deoxygenation and widespread anoxia likely caused phosphorus regeneration from suboxic and anoxic sediments. We argue that this fuelled shelf eutrophication, as widely recorded from microfossil studies, increasing organic carbon burial along continental margins as a negative feedback to carbon input and global warming. If properly quantified with future work, the PETM offers the opportunity to assess the biogeochemical effects of enhanced phosphorus regeneration, as well as the time-scales on which this feedback operates in view of modern and future ocean deoxygenation.

Sluijs, A.; van Roij, L.; Harrington, G. J.; Schouten, S.; Sessa, J. A.; LeVay, L. J.; Reichart, G.-J.; Slomp, C. P.

2013-12-01

185

Your time zone or mine?: a study of globally time zone-shifted collaboration  

Microsoft Academic Search

We conducted interviews with sixteen members of teams that worked across global time zone differences. Despite time zone differences of about eight hours, collaborators still found time to synchronously meet. The interviews identified the diverse strategies teams used to find time windows to interact, which often included times outside of the normal workday and connecting from home to participate. Recent

John C. Tang; Chen Zhao; Xiang Cao; Kori Inkpen

2011-01-01

186

LAMPF nuclear chemistry data acquisition system  

SciTech Connect

The LAMPF Nuclear Chemistry Data Acquisition System (DAS) is designed to provide both real-time control of data acquisition and facilities for data processing for a large variety of users. It consists of a PDP-11/44 connected to a parallel CAMAC branch highway as well as to a large number of peripherals. The various types of radiation counters and spectrometers and their connections to the system will be described. Also discussed will be the various methods of connection considered and their advantages and disadvantages. The operation of the system from the standpoint of both hardware and software will be described as well as plans for the future.

Giesler, G.C.

1983-01-01

187

Environmental Chemistry CHM1401H Transport and Fate of Chemical Species in the Environment  

E-print Network

Environmental Chemistry CHM1401H Transport and Fate of Chemical Species in the Environment Environmental Chemistry (Cross-listed Undergraduate CHM410H) CHM410H is an analytical theory, instrumental, and the connections between aerosols and climate. CHM1420H Environmental Chemistry of Soil This course will explore

Chan, Hue Sun

188

Chemistry Rocks: Redox Chemistry as a Geologic Tool.  

ERIC Educational Resources Information Center

Applies chemistry to earth science, uses rocks in chemistry laboratories, and teaches about transition metal chemistry, oxidation states, and oxidation-reduction reactions from firsthand experiences. (YDS)

Burns, Mary Sue

2001-01-01

189

DISSECTING HABITAT CONNECTIVITY  

EPA Science Inventory

abstract Connectivity is increasingly recognized as an important element of a successful reserve design. Connectivity matters in reserve design to the extent that it promotes or hinders the viability of target populations. While conceptually straightforward, connectivity i...

190

2001 TRAFFIC ZONE BOUNDARIES Zone Numbers  

E-print Network

TTS. It has been customised for the 2001 TTS data. The 2001 traffic zones are similar to the 1996 GTA zones. Within the GTA, minor modifications have been made to the zones in the City of Toronto, Peel.............................................................................A1 2001 Traffic Zones Region in GTA

Toronto, University of

191

Georgia Tech Chemistry & Biochemistrywww.chemistry.gatech.edu/rig --Research  

E-print Network

Georgia Tech Chemistry & Biochemistrywww.chemistry.gatech.edu/rig -- Research New Faculty Workshop.aip.org ! #12;Georgia Tech Chemistry & Biochemistrywww.chemistry.gatech.edu/rig -- Research New Faculty Workshop

Feig, Andrew

192

Igniting Chemistry in Fireworks  

NSDL National Science Digital Library

Students learn about the concepts of spectral chemistry, combustion, and the nature of fire through the use of visually rich fireworks resources. Optional resources address chemical reactions for those who want a more advanced chemistry lesson.

Foundation, Wgbh E.

2004-01-29

193

Computational Chemistry Robots  

E-print Network

Computational Chemistry Robots ACS Sep 2005 Computational Chemistry Robots J. A. Townsend, P. Murray-Rust, S. M. Tyrrell, Y. Zhang jat45@cam.ac.uk Can high-throughput computation provide a reliable “experimental” resource for molecular...

Townsend, Joseph A; Murray-Rust, Peter; Tyrrell, Simon M; Zhang, Yong

194

Environmental chemistry: Volume A  

SciTech Connect

This is an extensive introduction to environmental chemistry for engineering and chemical professionals. The contents of Volume A include a brief review of basic chemistry prior to coverage of litho, atmo, hydro, pedo, and biospheres.

Yen, T.F.

1999-08-01

195

Organometallic Chemistry of Molybdenum.  

ERIC Educational Resources Information Center

Suggests ways to avoid some of the problems students have learning the principles of organometallic chemistry. Provides a description of an experiment used in a third-year college chemistry laboratory on molybdenum. (TW)

Lucas, C. Robert; Walsh, Kelly A.

1987-01-01

196

An Introduction to Chemistry: Nuclear Chemistry  

NSDL National Science Digital Library

This cost-free resource is a chapter from a textbook on introductory chemistry, developed for learners with little background in physics or chemistry. This chapter deals with the atomic nucleus and radiation, nuclear energy, and uses of radioactive substances. It is appropriate for teachers seeking additional content knowledge, high school physics and chemistry courses, and college-level preparatory chemistry. It builds a foundation to understand the physical forces in the nucleus (electrostatic force and strong force), and explains how chemical reactions differ from nuclear reactions. Graphs and diagrams depict what happens in radioactive decay. The section on chemical nuclear equations is straightforward and comprehensible for non-scientists. This collection is part of An Introduction to Chemistry, a set of resources developed by Mark Bishop which includes two textbooks, 15 animated tutorials, downloadable Power Point presentations for teachers, concept maps, and 3D molecular models.

Bishop, Mark

197

The Chemistry Hypermedia Project  

NSDL National Science Digital Library

These materials and documents are typical of those presented in an undergraduate course in general chemistry, analytical chemistry, and analytical instrumentation. Resources for educators include Excel spreadsheet simulations for analytical and physical chemistry, prototype JavaScripts and PERL scripts, lists of web workshops and publications, and links to the most recent papers and presentations from the Chemistry Hypermedia Project. There are also tutorials for equilibrium practice problems and analytical spectroscopy.

198

Why chemistry? Chemistry is fundamental: it is the enabling science  

E-print Network

Chemistry Why chemistry? Chemistry is fundamental: it is the enabling science that underlies many technology. A chemistry degree allows you to understand and to contribute to our future. Chemistry is challenging: understanding the very fabric of matter is both stimulating and rewarding. Studying chemistry

Sussex, University of

199

Chemistry Division Department of Biological  

E-print Network

1 Chemistry Division Department of Biological and Chemical Sciences, Illinois Institute-13 Chemistry Division invites nominations for Kilpatrick Fellowship for the academic year 2012's Chemistry Department from 1947­1960. Mary Kilpatrick was a chemistry faculty member from 1947

Heller, Barbara

200

Adam Benoit Medicinal Chemistry  

E-print Network

#12;Adam Benoit Medicinal Chemistry Ph.D. Thesis Title: Synthesis and Evaluation of Acridine Country: United States #12;Amit Gangar Medicinal Chemistry Ph.D. Thesis Title: Design and Development Wagner Home Country: India #12;Dan Wang Medicinal Chemistry M.S. Thesis Title: Synthesis and Evaluation

Thomas, David D.

201

A chronicler of chemistry  

NASA Astrophysics Data System (ADS)

Thomas Hager, author of popular science books that revisit some of the most significant developments in chemistry over the past century, talks to Nature Chemistry about the challenges of writing for a general audience, and how his dislike of chemistry was turned around by a fellow Oregonian of considerable repute.

2012-04-01

202

Green Chemistry and Education.  

ERIC Educational Resources Information Center

Many students today are profoundly interested in the sustainability of their world. Introduces Green Chemistry and its principles with teaching materials. Green Chemistry is the use of chemistry for pollution prevention and the design of chemical products and processes that are environmentally benign. (ASK)

Hjeresen, Dennis L.; Schutt, David L.; Boese, Janet M.

2000-01-01

203

Chemistry and Art.  

ERIC Educational Resources Information Center

Describes a Chemistry and Art project developed for secondary students and teachers sponsored by the National Gallery and The Royal Society of Chemistry in the United Kingdom. Discusses aspects of the techniques used in creating five paintings as well as the chemistry involved in their making, deterioration, conservation, and restoration.…

Berry, Martyn

1999-01-01

204

Environmental Chemistry Activities.  

ERIC Educational Resources Information Center

The authors of this curriculum supplement believe in a laboratory approach to chemistry and express the feeling that environmental chemistry provides the students an opportunity to apply theoretical chemistry to important practical problems. There are eighteen activities presented, each accompanied with behavioral objectives, one or more suggested…

Jackland, Thomas; And Others

205

Engineering Materials and Chemistry  

E-print Network

................................................................................................. 10 #12;3 Course staff Dr John Daniels (Materials) Course Coordinator & Lecturer Room 217, School: by appointment A/Prof Stephen Colbran (Chemistry) Lecturer Room 225 Dalton Building (F12) Phone: 9385 4737 s: by appointment Ms Anne Ayres (Chemistry) Chemistry Tutorial and Laboratory Administrator Room 105 Dalton Building

New South Wales, University of

206

Part 2. Three Primary Areas of Theoretical Chemistry Chapter 5. An Overview of Theoretical Chemistry  

E-print Network

, and plastic materials comprised of molecules. All such forms of molecular matter are what chemistry is about addresses is molecular structure, which means how the molecule's atoms are linked together by bonds and what-zwitterion form with dotted hydrogen bond. The connectivity among the atoms in arginine is dictated by the well

Simons, Jack

207

Alcohol, Chemistry and You  

NSDL National Science Digital Library

Developed by Kennesaw State University, ChemCases.com is a series of curriculum units that link responsible decision making in product development with chemical principles taught in college General Chemistry. Alcohol, Chemistry and You, by Dr. Bill Boggan, is the latest offering by the Web site, which "looks at the chemistry of beverage alcohol (ethyl alcohol) through the eyes of a General Chemistry student." The fourteen chapter lessons cover everything from what ethyl alcohol is to alcohol addiction, relating it to various principles learned in a general chemistry course.

2001-01-01

208

Connect and Thrive: Perspectives from a Newly Tenured Professor  

ERIC Educational Resources Information Center

This essay encapsulates the author's perspective on how average professors can become highly effective professors. The author asserts that the secret rests in the ability to genuinely connect with students. Connecting really matters--even if it takes some personality adaptation and thrusts academics out of their comfort zones. Many professors fail…

Ciocchetti, Corey A.

2011-01-01

209

The bottom intertidal zone  

NSDL National Science Digital Library

The bottom intertidal area remains under water except during low tides. This zone is most abundant of the intertidal zones and contains seaweeds and other plants, invertebrates, and fishes. The bottom zone is subject to the most intense wave action.

Katie Hale (CSUF;Biological Sciences)

2007-06-08

210

The upper intertidal zone  

NSDL National Science Digital Library

The upper intertidal zone is exposed most of the time and will become submerged only during high tide. This zone is least abundant of the intertidal zones but contains some mollusks, barnacles, and other animals adapted to avoid drying out.

Katie Hale (California State University, Fullerton;Student, Biological Sciences)

2007-01-04

211

The upper intertidal zone  

NSDL National Science Digital Library

The upper intertidal zone is exposed most of the time and will become submerged only during high tide. This zone is least abundant of the intertidal zones but contains some mollusks, barnacles, and other animals adapted to avoid drying out.

Katie Hale (CSUF;Biological Sciences)

2007-06-08

212

Groundwater flows in weathered crystalline rocks: Impact of piezometric variations and depth-dependent fracture connectivity  

NASA Astrophysics Data System (ADS)

Groundwater in shallow weathered and fractured crystalline rock aquifers is often the only perennial water resource, especially in semi-arid region such as Southern India. Understanding groundwater flows in such a context is of prime importance for sustainable aquifer management. Here, we describe a detailed study of fracture properties and relate the hydraulic connectivity of fractures to groundwater flows at local and watershed scales. Investigations were carried out at a dedicated Experimental Hydrogeological Park in Andhra Pradesh (Southern India) where a large network of observation boreholes has been set up. Twenty-height boreholes have been drilled in a small area of about 18,000 m2 in which borehole loggings and hydraulic tests were carried out to locate the main flowing fractured zones and investigate fractures connectivity. Several hydraulic tests (nineteen slug tests and three pumping tests) performed under two water level conditions revealed contrasting behavior. Under high water level conditions, the interface including the bottom of the saprolite and the first flowing fractured zone in the upper part of the granite controls groundwater flows at the watershed-scale. Under low water level conditions, the aquifer is characterized by lateral compartmentalization due to a decrease in the number of flowing fractures with depth. Depending on the water level conditions, the aquifer shifts from a watershed flow system to independent local flow systems. A conceptual groundwater flow model, which includes depth-dependent fracture connectivity, is proposed to illustrate this contrasting hydrological behavior. Implications for watershed hydrology, groundwater chemistry and aquifer vulnerability are also discussed.

Guihéneuf, N.; Boisson, A.; Bour, O.; Dewandel, B.; Perrin, J.; Dausse, A.; Viossanges, M.; Chandra, S.; Ahmed, S.; Maréchal, J. C.

2014-04-01

213

Power connect safety and connection interlock  

NASA Technical Reports Server (NTRS)

A power connect safety and connection interlock system is shown for use with inverters and other DC loads (16) which include capacitor filter banks (14) at their DC inputs. A safety circuit (20) operates a spring (26) biased, solenoid (22) driven mechanical connection interference (24) which prevents mating and therefore electrical connection between the power contactor halves (11, 13) of the main power contacts (12) until the capacitor bank is safely precharged through auxiliary contacts (18). When the DC load (16) is shut down, the capacitor bank (14) is automatically discharged through a discharging power resistor (66) by a MOSFET transistor (60) through a discharging power resistor (66) only when both the main power contacts and auxiliary contacts are disconnected.

Rippel, Wally E. (Inventor)

1992-01-01

214

Future of Chemistry Assumptions: Taking Chemistry in New Directions**  

E-print Network

Future of Chemistry Assumptions: Taking Chemistry in New Directions** George M. Whitesides* Keywords: Bioorganic chemistry · genomics · medicinal chemistry · philosophy of chemistry "When in scientists. We all do it. We also take it as an article of faith that serious predic- tions are almost always

Prentiss, Mara

215

Department of Chemistry Table of Contents  

E-print Network

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Green & Environmental Chemistry . . . . . . . . . . . . . . . . . . . . 17 Physical Chemistry W ith strengths in polymer science, green and environmental chemistry, bioorganic, bioinorganic

Kurnikova, Maria

216

Environmental chemistry: Volume B  

SciTech Connect

This is an extensive introduction to environmental chemistry for engineering and chemical professionals. The contents of Volume B include equilibria processes, chemical processes, biochemical processes, and physicochemical processes.

Yen, T.F.

1999-08-01

217

Science Update: Analytical Chemistry.  

ERIC Educational Resources Information Center

Briefly discusses new instrumentation in the field of analytical chemistry. Advances in liquid chromatography, photoacoustic spectroscopy, the use of lasers, and mass spectrometry are also discussed. (CS)

Worthy, Ward

1980-01-01

218

Chemistry @ Imperial College 2007 Introduction  

E-print Network

Chemistry @ Imperial College 2007 #12;2 Introduction Imperial College is a world leading University. As the central science Chemistry has been a major contributor to this success. The Chemistry Department is at the forefront of modern Chemistry research, both in our core discipline and at the interfaces of Chemistry

219

Interfacial Soil Chemistry of Radionuclides in the Unsaturated Zone  

Microsoft Academic Search

We are in the final year (in a one-year extension) of a project with the principal goal of investigating the impact of clay surface alteration, resulting from hydroxy-aluminum (HyA) and hydroxyaluminosilicate (HAS) species intercalation on reactivity of soils towards Cs and Sr. Special emphasis has been accorded to the unique geochemical conditions that are representative of the Hanford site vadose

Jon Chorover; Karl T. Mueller; K. G. Karthikeyan; A. Vairavamurthy; R. Jeff Serne

2002-01-01

220

Chlorine Chemistry Division  

NSDL National Science Digital Library

This site is provided by the American Chemistry Council's Chlorine Chemistry Division. The page contains several links that give an introduction to chlorine, its uses, and issues surrounding the chemical compound. There is also a link to the Chlorine Science Center which provides classroom activities and a chlorine compound of the month.

2008-01-02

221

High School Chemistry.  

ERIC Educational Resources Information Center

Preparation for college or life, working conditions and continuing education for high school chemistry teachers, and form/function of high school chemistry textbooks were addressed in presentations at the Seventh Biennial Conference on Chemical Education (Stillwater, Oklahoma 1982). Workshops, lectures, and demonstrations were also presented to…

Journal of Chemical Education, 1983

1983-01-01

222

Selectivity in Analytical Chemistry  

NSDL National Science Digital Library

The International Union of Pure and Applied Chemistry (IUPAC) has put online a draft of recommendations for the correct use of the terms "selectivity" and "specificity" in analytical chemistry. The provisional report, available for download in .pdf format, was drafted by the IUPAC's Analytical Division Task Force, and reader comments are welcomed until September 30, 2001.

2001-01-01

223

Selectivity in Analytical Chemistry  

NSDL National Science Digital Library

The International Union of Pure and Applied Chemistry (IUPAC) has put online a draft of recommendations for the correct use of the terms "selectivity" and "specificity" in analytical chemistry. The provisional report, available for download in .pdf format, was drafted by the IUPAC's Analytical Division Task Force, and reader comments are welcomed until September 30, 2001.

2005-11-01

224

Movies in Chemistry Education  

ERIC Educational Resources Information Center

This article reviews numerous studies on chemistry movies. Movies, or moving pictures, are important elements of multimedia and signify a privileged or motivating means of presenting knowledge. Studies on chemistry movies show that the first movie productions in this field were devoted to university lectures or documentaries. Shorter movies were…

Pekdag, Bulent; Le Marechal, Jean-Francois

2010-01-01

225

Environmental Chemistry Library  

NSDL National Science Digital Library

This is an "everything" site for the teaching of environmental chemistry. The site contains some unique case studies, a list of textbooks, lab and modeling activities and other educational content. The content is still in development, but the material provided would be helpful in developing a unit or course on environmental chemistry.

2011-03-31

226

Brushing Up on Chemistry.  

ERIC Educational Resources Information Center

Presents an activity designed for use during National Chemistry Week 2002 with the theme "Chemistry Keeps Us Clean". Allows students to discover more about a cleaning product they use everyday. Students make their own toothpaste and compare its properties with those of commercial toothpaste. (MM)

Trantow, Ashley

2002-01-01

227

Chemistry for Fuel Cells  

NSDL National Science Digital Library

This presentation provides a basic introduction to the chemistry involved with fuel cell technology. The material covers chemical bonds, some basic atomic properties, the Noble Gas Theory and how the chemistry of fuel cells works.This document may be downloaded in Microsoft PowerPoint file format.

2012-09-13

228

Infrared Lasers in Chemistry.  

ERIC Educational Resources Information Center

Selected infrared laser chemistry topics are discussed including carbon dioxide lasers, infrared quanta and molecules, laser-induced chemistry, structural isomerization (laser purification, sensitized reactions, and dielectric breakdown), and fundamental principles of laser isotope separation, focusing on uranium isotope separation. (JN)

John, Phillip

1982-01-01

229

Chemistry from Issues.  

ERIC Educational Resources Information Center

Describes the "Chemistry from Issues" project at Chelsea College. Provides the background information, rationale, and overall structure of a proposed course about the importance of chemistry to common culture. Outlines one module about the British steel industry that has been taught at King's College. (TW)

Harding, Jan; Donaldson, Jim

1986-01-01

230

Dynamic chemistry of anion recognition  

SciTech Connect

In the past 40 years, anion recognition by synthetic receptors has grown into a rich and vibrant research topic, developing into a distinct branch of Supramolecular Chemistry. Traditional anion receptors comprise organic scaffolds functionalized with complementary binding groups that are assembled by multistep organic synthesis. Recently, a new approach to anion receptors has emerged, in which the host is dynamically self-assembled in the presence of the anionic guest, via reversible bond formation between functional building units. While coordination bonds were initially employed for the self-assembly of the anion hosts, more recent studies demonstrated that reversible covalent bonds can serve the same purpose. In both cases, due to their labile connections, the molecular constituents have the ability to assemble, dissociate, and recombine continuously, thereby creating a dynamic combinatorial library (DCL) of receptors. The anionic guests, through specific molecular recognition, may then amplify (express) the formation of a particular structure among all possible combinations (real or virtual) by shifting the equilibria involved towards the most optimal receptor. This approach is not limited to solution self-assembly, but is equally applicable to crystallization, where the fittest anion-binding crystal may be selected. Finally, the pros and cons of employing dynamic combinatorial chemistry (DCC) vs molecular design for developing anion receptors, and the implications of both approaches to selective anion separations, will be discussed.

Custelcean, Radu [ORNL

2012-01-01

231

Organic Chemistry Resources Worldwide  

NSDL National Science Digital Library

Organic Chemistry Worldwide is an excellent organic chemistry metasite that is not to be missed. Geared toward synthetic organic chemists involved in academic or industrial research, Organic Chemistry Resources Worldwide has a mission to collect and independently annotate "all useful organic chemistry sites and to present them in an intuitive way." This extensive metasite is divided into sections on literature, laboratory resources, spectroscopy and spectrometry, nomenclature and teaching, and conferences and organizations. The Literature section contains links to over 75 journals (some restricted access), 14 free databases (and many more commercial), dissertation collections, reviews, guides, patents, and current awareness sources. Examples of resources for laboratory work include links to chemical product databases, laboratory safety bulletins (.pdf), products and services, etc. Highlights of the site are an in-depth section on mass spectrometry, with links to publications and databases, and a plethora of links to organic chemistry labs worldwide, from Armenia to Uruguay.

Van Aken, Koen

1996-01-01

232

Connected Chemistry -A study of secondary students using agent-based models to learn Chemistry  

E-print Network

-test and post-test, two intermediate interviews and observation categories. In this study, which is the first of a series of studies, two 10-student groups were matched for ability and gender. One group received the high changes. We provide a preliminary analysis of the lack of marked difference between the students

Wilensky, Uri

233

Connecting to the Internet  

Microsoft Academic Search

\\u000a One of the first things most people want to do today once they get their computer set up is to get it connected to the Internet.\\u000a Depending on your connection, this could range from ridiculously easy to just fairly easy… at least as far as configuring\\u000a Mac OS X goes. Essentially, there are two common ways to connect to the

Scott Meyers; Mike Lee

234

Chemistry 675 (CHE 675) Advanced Organic Chemistry  

E-print Network

, with required reading assignments given on the syllabus. Learning outcomes Upon completion of this course, a student should have mastered the following areas / skills: Understand the structure of organic molecules of interest Gain an appreciation of the current state of mechanistic investigation in chemistry and related

Mather, Patrick T.

235

Chip connectivity verification program  

NASA Technical Reports Server (NTRS)

A method for testing electrical connectivity between conductive structures on a chip that is preferably layered with conductive and nonconductive layers. The method includes determining the layer on which each structure is located and defining the perimeter of each structure. Conductive layer connections between each of the layers are determined, and, for each structure, the points of intersection between the perimeter of that structure and the perimeter of each other structure on the chip are also determined. Finally, electrical connections between the structures are determined using the points of intersection and the conductive layer connections.

Riley, Josh (Inventor); Patterson, George (Inventor)

1999-01-01

236

Benchmarking the Connection Machine  

SciTech Connect

The purpose of this memo is to present the results of work done recently on the Connection Machine during a one-week visit by the authors to Thinking Machines Corporation. The main objectives of the trip were to benchmark the Connection Machine and to assess the software environment, in order to determine the suitability of the Connection Machine for solving computationally-intensive problems and to compare the Connection Machine with other highly-parallel computers. This report presents preliminary results, and describes the computer architecture.

Baillie, C.; Felten, E.; Walker, D.

1987-01-01

237

Moderator Chemistry Program  

SciTech Connect

Over the past fifteen months, the Systems Chemistry Group of the Reactor Engineering Department has undertaken a comprehensive study of the Department`s moderator chemistry program at Savannah River Site (SRS). An internal review was developed to formalize and document this program. Objectives were as outlined in a mission statement and action plan. In addition to the mission statement and action plan, nine separate task reports have been issued during the course of this study. Each of these task reports is included in this document as a chapter. This document is an organized compilation of the individual reports issued by the Systems Chemistry Group in assessment of SRS moderator chemistry to determine if there were significant gaps in the program as ft existed in October, 1989. While these reviews found no significant gaps in that mode of operation, or any items that adversely affected safety, items were identified that could be improved. Many of the items have already been dear with or are in the process of completion under this Moderator Chemistry Program and other Reactor Restart programs. A complete list of the items of improvement found under this assessment is found in Chapter 9, along with a proposed time table for correcting remaining items that can be improved for the chemistry program of SRS reactors. An additional external review of the moderator chemistry processes, recommendations, and responses to/from the Reactor Corrosion Mitigation Committee is included as Appendix to this compilation.

Dewitt, L.V.; Gibbs, A.; Lambert, D.P.; Bohrer, S.R.; Fanning, R.L.; Houston, M.W.; Stinson, S.L.; Deible, R.W.; Abdel-Khalik, S.I.

1990-11-01

238

Moderator Chemistry Program  

SciTech Connect

Over the past fifteen months, the Systems Chemistry Group of the Reactor Engineering Department has undertaken a comprehensive study of the Department's moderator chemistry program at Savannah River Site (SRS). An internal review was developed to formalize and document this program. Objectives were as outlined in a mission statement and action plan. In addition to the mission statement and action plan, nine separate task reports have been issued during the course of this study. Each of these task reports is included in this document as a chapter. This document is an organized compilation of the individual reports issued by the Systems Chemistry Group in assessment of SRS moderator chemistry to determine if there were significant gaps in the program as ft existed in October, 1989. While these reviews found no significant gaps in that mode of operation, or any items that adversely affected safety, items were identified that could be improved. Many of the items have already been dear with or are in the process of completion under this Moderator Chemistry Program and other Reactor Restart programs. A complete list of the items of improvement found under this assessment is found in Chapter 9, along with a proposed time table for correcting remaining items that can be improved for the chemistry program of SRS reactors. An additional external review of the moderator chemistry processes, recommendations, and responses to/from the Reactor Corrosion Mitigation Committee is included as Appendix to this compilation.

Dewitt, L.V.; Gibbs, A.; Lambert, D.P.; Bohrer, S.R.; Fanning, R.L.; Houston, M.W.; Stinson, S.L.; Deible, R.W.; Abdel-Khalik, S.I.

1990-11-01

239

Making the Internet Connection.  

ERIC Educational Resources Information Center

Provides information on commercial connections to the Internet via gateways as opposed to direct connection or through a modem. Hardware and software requirements are described; and commercial online services offering an Internet gateway are discussed, including America Online, CompuServe, Delphi, GEnie, and Prodigy. (LRW)

Descy, Don E.

1995-01-01

240

Connecting Arithmetic to Algebra  

ERIC Educational Resources Information Center

Algebraic thinking is a top priority in mathematics classrooms today. Because elementary school teachers lay the groundwork to develop students' capacity to think algebraically, it is crucial for teachers to have a conceptual understanding of the connections between arithmetic and algebra and be confident in communicating these connections. Many…

Darley, Joy W.; Leapard, Barbara B.

2010-01-01

241

Artificial limb connection  

NASA Technical Reports Server (NTRS)

Connection simplifies and eases donning and removing artificial limb; eliminates harnesses and clamps; and reduces skin pressures by allowing bone to carry all tensile and part of compressive loads between prosthesis and stump. Because connection is modular, it is easily modified to suit individual needs.

Owens, L. J.

1974-01-01

242

Caldecott Connections to Science.  

ERIC Educational Resources Information Center

This volume brings award-winning literature to all areas of the science curriculum. The lesson plan format includes the four stages of engagement, elaboration, exploration, and connection. Each story is followed by activities that make connections between literature, science, and the arts. Chapters include: (1) "Frog Went A-Courtin'," which…

Glandon, Shan

243

Differential Forms and Connections  

Microsoft Academic Search

This book introduces the tools of modern differential geometry--exterior calculus, manifolds, vector bundles, connections--and covers both classical surface theory, the modern theory of connections, and curvature. Also included is a chapter on applications to theoretical physics. The author uses the powerful and concise calculus of differential forms throughout. Through the use of numerous concrete examples, the author develops computational skills

R. W. R. Darling

1994-01-01

244

BASIC ELECTRICAL CONNECTION PRINCIPLES  

E-print Network

involving aluminum conductors than those encountered in copper to copper connections. CREEP (COLD FLOW is the conductor as compared to copper, since its creep rate is many times that of copper. Effect of Creep: FigureBURNDY Reference BASIC ELECTRICAL CONNECTION PRINCIPLES Basic Factors: The basic factors which

Johnson, Eric E.

245

Real World Graph Connectivity  

ERIC Educational Resources Information Center

We present the topic of graph connectivity along with a famous theorem of Menger in the real-world setting of the national computer network infrastructure of "National LambdaRail". We include a set of exercises where students reinforce their understanding of graph connectivity by analysing the "National LambdaRail" network. Finally, we give…

Lind, Joy; Narayan, Darren

2009-01-01

246

Umbilical connect systems.  

NASA Technical Reports Server (NTRS)

Umbilical connect systems were studied for the purpose of developing techniques, specifications, and hardware design concepts for prototype systems to be used in the space shuttle program. New techniques are described which permit rapid and reliable mating, connection, and checkout of umbilical carrier assemblies and couplings for vehicle services (cryogenic, electrical, pneumatic, and hydraulic systems).

Valkema, D.

1972-01-01

247

Chemistry 1120 Elementary Bioorganic Chemistry Spring 2013  

E-print Network

this semester are contained in this manual. � Connect, an online homework system created by the publisher of our-stop shopping for our course, featuring folders of lecture notes, discussion pages and announcements

Simons, Jack

248

The Chemistry of Cocaine  

NSDL National Science Digital Library

This case study looks at cocaine, including its addictive properties and the chemistry involved in the synthesis of the drug in its different forms. The lesson can be used to teach nucleophilic addition reactions, nucleophilic acyl substitution, and cocaine metabolism. The material was designed for use in an undergraduate organic chemistry course but could also be used in medicinal chemistry coursework. The case study and teaching notes may be downloaded in PDF format. The site also includes a section for instructor feedback where general comments may be read and contributed.

Dewprashad, Brahmadeo

2011-01-06

249

Green Chemistry Teaching Resources  

NSDL National Science Digital Library

The American Chemical Society (ACS) has created these excellent resources via the Green Chemistry Institute and the ACS Education Division. The goal of these materials is "to increase awareness and understanding of Green Chemistry principles, alternatives, practices, and benefits within traditional educational institutions and among practicing scientists." In the Online Resources section, visitors will find downloadable pocket guides to basic green chemistry principles, "Greener Education Materials for Chemists" from the University of Oregon, and more. Perhaps the best section of the site is Activities and Experiments, where visitors can look over activities like "Gassing Up Without Air Pollution" and "Cleaning Up With Atom Economy."

2012-10-26

250

Chemistry in Bioinformatics  

E-print Network

F R O N T M A T T E R Chemistry in Bioinformatics Peter Murray?Rust,1 John B. O. Mitchell,1 and Henry S. Rzepa2 1 Unilever Centre for Molecular Science Informatics, Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge. CB2... 1EW, UK. 2 Department of Chemistry, Imperial College London, SW7 2AY, UK. Abstract Chemical information is now seen as critical for most areas of life sciences. But unlike Bioinformatics, where data is Openly available and freely re...

Murray-Rust, Peter; Mitchell, John B O; Rzepa, Henry S

2005-05-19

251

Harvard University: Environmental Chemistry  

NSDL National Science Digital Library

The Environmental Chemistry group at Harvard University created this website to promote its research in the understanding and quantification of chemistry of surfaces in environmental chemical systems. Users can learn about the group's many projects that deal with the shared topic: "What controls the formation and reactivity of a surface?" Researchers can find out about the group's seminars held at Harvard and can download many of the related publications. The website publicizes the efforts and backgrounds of the eleven people involved with environmental chemistry. Students and educators can view short, fascinating movies dealing with its results.

252

Chemistry in Bioinformatics  

E-print Network

ral ssBioMed CentBMC Bioinformatics Open AcceChemistry in Bioinformatics Peter Murray-Rust†1, John BO Mitchell†1 and Henry S Rzepa*†2 Address: 1Unilever Centre for Molecular Science Informatics, Department of Chemistry, University of Cambridge... , Lensfield Road, Cambridge. CB2 1EW, UK. and 2Department of Chemistry, Imperial College London, SW7 2AY, UK. Email: Peter Murray-Rust - pm286@cam.ac.uk; John BO Mitchell - jbom1@cam.ac.uk; Henry S Rzepa* - rzepa@ic.ac.uk * Corresponding author †Equal...

Murray-Rust, Peter; Mitchell, John B O; Rzepa, Henry S

2005-06-07

253

Wizardry and Chemistry  

NSDL National Science Digital Library

Students learn how common pop culture references (Harry Potter books) can relate to chemistry. While making and demonstrating their own low-intensity sparklers (muggle-versions of magic wands), students learn and come to appreciate the chemistry involved (reaction rates, Gibb's free energy, process chemistry and metallurgy). The fun part is that all wands are personalized and depend on how well students conduct the lab. Students end the activity with a class duelâa face-off between wands of two different chemical compositions. This lab serves as a fun, engaging review for stoichiometry, thermodynamics, redox and kinetics, as well as advanced placement course review.

National Science Foundation GK-12 and Research Experience for Teachers (RET) Programs,

254

Materials Chemistry at SFU  

NSDL National Science Digital Library

The Materials Science group at Simon Fraser University (SFU) developed this website to address the group's primary research interests in material synthesis, molecular, electronics, and photonics. Visitors will find explanations covering sixteen research topics including chemical sensors, lithography, non-linear optics, and supramolecular chemistry. Under each topic heading, users will find links discussing the faculties' current goals, recent publications, and patents. The site also features links to the Pacific Centre for Advanced Materials and Microstructures; a collaborative effort between the Materials Science group at SFU and the physics and chemistry departments at the University of British Columbia. Anyone searching for the latest investigations in materials chemistry will find this website very informative.

255

Microscale Gas Chemistry  

NSDL National Science Digital Library

Created by Professor Bruce M. Mattson, PhD, of Creighton University's Department of Chemistry, the Microscale Gas Chemistry Website "provides instructions for the generation of gases on a microscale level along with instructions for chemical demonstrations and student laboratory experiments with the gases." The no-frills site, designed for high school and university chemistry teachers, contains clear and careful instructions for experiments with carbon dioxide, hydrogen, oxygen and nitrogen, nitrogen oxides, ammonia, ethene, chlorine, carbon monoxide, and more. An introduction offers two low-tech methods for gas generation. Data pages for relevant gases are linked to each experiment.

256

Connect-ED: Higher Education Information Exchange  

NSDL National Science Digital Library

St. John's University offers this distribution-only information service for and about institutions of higher education. Connect-ED was established to disseminate information about the programs, schools, faculties and courses of study of post-secondary institutions, schools of higher learning, or tertiary educational institutes, in order to assist subscribers in decisions regarding recruitment and selection. The list will be of particular interest to education administrators; faculty; information, public relations or recruitment officers; students; and potential employers. The material posted on this list might include: notices of new, established, or unique programs; special events, publications, and media coverage; conferences, meetings, faculty or institutional awards; changes in educational standards, admission criteria, or curricula; fees; scholarship availability; accreditation reports; calls for papers; application deadlines; degree requirements; credit balancing; and course delivery (traditional, on-line, Internet, teleconference or other methods).

1998-01-01

257

I. Required core Chemistry Courses (1905 & 1925) Chemistry  

E-print Network

Advisor: Advisee: I. Required core Chemistry Courses (1905 & 1925) Chemistry CH 111 PY 211 _____ PY 212 _____ (or PY 242 _____ or PY 252 ______) II. Chemistry Options (one required) 1905 (Concentration in Chemistry) Option A (2 advanced CH courses, 401 or higher, only one may

258

National Chemistry Week Theme: "Candy: The Sweet Side of Chemistry"  

E-print Network

National Chemistry Week Theme: "Candy: The Sweet Side of Chemistry" Super Science Saturday Saturday-on chemistry and science demonstrations! All students & families are welcome! Fun & educational for all ages! Sponsored by: American Chemical Society LSU Department of Chemistry LSU Athletic Department Free admission

Stephens, Jacqueline

259

INSTRUMENTAL METHODS IN PHYSICAL CHEMISTRY Chemistry 434 Syllabus ----Fall 10  

E-print Network

INSTRUMENTAL METHODS IN PHYSICAL CHEMISTRY Chemistry 434 Syllabus ---- Fall 10 Instructor Dr-11:15A Text: Handouts in Class Supplements (all optional): Experimental Physical Chemistry, 2nd ed, Arthur Halpern Experiments in Physical Chemistry, 6th ed, Shoemaker, Garland, and Nibler Building

Wagner, Diane

260

Links between worlds: Unraveling migratory connectivity  

USGS Publications Warehouse

Migration is the regular seasonal movement of animals from one place to another, often from a breeding site to a nonbreeding site and back. Because the act of migration makes it difficult to follow individuals and populations year round, our understanding of the ecology and evolution of migrating organisms, particularly birds, has been severely impeded. Exciting new advances in satellite telemetry, genetic analyses and stable isotope chemistry are now making it possible to determine the population and geographical origin of individual birds. Here, we review these new approaches and consider the relevance of understanding migratory connectivity to ecological, evolutionary and conservation issues.

Webster, M.; Marra, P. P.; Haig, Susan M.; Bensch, S.; Holmes, R. T.

2002-01-01

261

Figure This: Time Zones  

NSDL National Science Digital Library

This is an activity featuring a time zone map useful when teaching an interdisciplinary social studies and math unit focusing on geography and the time zones. It underscores the role of the earth's rotation in everyday life, and the need to understand the relationships between earth rotation, day and night, and time zones around the world.

2004-01-01

262

Learn Chemistry: Chemistry Resources for Teachers  

NSDL National Science Digital Library

The Royal Society of Chemistry has created this most useful website to help teachers and students of chemistry learn about the field via interactive experiments, diagrams, animations, and so on. The site includes over 3,300 resources. Visitors can get started by using the Resource Type tab. Here they can browse through ten different headings, including Worksheet, Quiz, Tutorial, and Podcast. The Experiments area is quite wonderful, as it includes over 340 different experiments that can be conducted in the classroom. A few highlights in this area include "Challenging Medicines: Making Medicines," "The Salt Cellar Mystery," and "Which solution is which?" Overall, it's a tremendous site and one that visitors will want to share with friends.

263

Chemistry Societies Network  

NSDL National Science Digital Library

Users gain access to the heart of CSN's site through the site gateway which leads them to CSN's information arcade, education arcade, societies, chembytes, and conferences and events. The information arcade provides links to experts and specialists, and chemistry societies. The education arcade contains a wealth of information for educators in the chemistry arena. Societies lists chemical and chemistry-related societies, divided alphabetically by country. Chembytes provides access to a variety of news, including recent findings and discoveries, business updates, and news from around the globe. Chembytes also features a continuing series which looks in-depth at a topic recently in the news. Currently featured is NASA's attempt to return to the moon. Conferences and Events is searchable and browseable and contains a submission form so visitors can list an event. CSN's site also includes Useful Links, a listing of sites categorized and reviewed by Chemsoc and Science Park, which links to four companies offering chemistry related resources on the web.

2007-05-22

264

High School Chemistry.  

ERIC Educational Resources Information Center

Summarizes papers presented at the Sixth Biennial Conference on Chemical Education in the area of high school chemistry, particularly dealing with the high school/college interface. A bibliography of 16 presented papers on this topic is attached. (CS)

Journal of Chemical Education, 1981

1981-01-01

265

General Chemistry for Engineers.  

ERIC Educational Resources Information Center

Discusses the relationship between molecular structure, intermolecular forces, and tensile strengths of a polymer and suggests that this is a logical way to introduce polymers into a general chemistry course. (Author/JN)

Kybett, B. D.

1982-01-01

266

Sequencing General Chemistry  

NSDL National Science Digital Library

The material in the authors' general chemistry curriculum has been rearranged into a sequence thought to be more logical to students than the traditional sequence. This fresh approach does not radically change course content but rather produces a systemat

Yoblinski, B. J.

2003-03-01

267

Chemistry for Nonscientists  

ERIC Educational Resources Information Center

Discusses the case of DDT which can be introduced to nonscience students in a chemistry course, including the development of DDT, problems associated with its adverse effects, and curtailment of its use in our environments. (CC)

Weil, Thomas A.; And Others

1974-01-01

268

General Chemistry Multimedia Problems  

NSDL National Science Digital Library

General Chemistry Multimedia Problems ask students questions about experiments they see presented using videos and images. The questions asked apply concepts from different parts of an introductory course, encouraging students to decompartmentalize the material.

269

Magnetism in Chemistry  

ERIC Educational Resources Information Center

Discusses the technical aspects of paramagnetism and an electrostatic model called Crystal Field Theory (CFT), very often used in the case of transition metal compounds. Suggests that this discussion be included as an option for college chemistry courses. (MLH)

Brookes, R. W.; McFadyen, W. D.

1975-01-01

270

Chemistry and Detective Fiction.  

ERIC Educational Resources Information Center

Describes an interdisciplinary program consisting of two courses. The first course deals with the chemistry of drugs and poisons; the second course focuses on fictional works in which these drugs and poisons are central to the plots. (SK)

Labianca, Dominick A.; Reeves, William J.

1981-01-01

271

Supplemental instruction in chemistry  

NASA Astrophysics Data System (ADS)

This study was designed to measure some effects of supplemental instruction in chemistry. Supplemental instruction is a peer-led cooperative learning program that encourages students to develop conceptual understanding by articulating both understandings and misconceptions in a think-aloud fashion. Supplemental instruction was offered three hours weekly outside of class and lab time for students in four classes of General Organic and Biological Chemistry. Over a two-year period 108 students volunteered to participate in this program; 45 students did not participate. As measured by final grades in chemistry and responses to a questionnaire, supplemental instruction was effective in increasing students' achievement in chemistry. Further research is needed to determine the in-depth effects of supplemental instruction on students' learning, problem solving, and self-esteem.

Lundeberg, Mary A.

272

Chemistry for Kids.  

ERIC Educational Resources Information Center

Reports two methods for interesting children in chemistry. Describes a method for producing large soap bubbles and films for study. Examines the use of simple stories to explain common chemical concepts with example given. Lists titles of available stories. (ML)

Sato, Sanae; Majoros, Bela

1988-01-01

273

Environmental Bioinorganic Chemistry  

ERIC Educational Resources Information Center

Discusses some important aspects of bioinorganic chemistry, including interactions of organisms with metallic and nonmetallic elements and compounds. Indicates that many environmental problems are created by human exploitation of nature and technologies if studied from a bioinorganic chemical viewpoint. (CC)

Ochiai, Ei-Ichiro

1974-01-01

274

Making Chemistry Relevant  

ERIC Educational Resources Information Center

Discusses the conduct of a general inorganic chemistry course in a community junior college with emphases upon students' participation and interests. Included are a list of proposed topics and two samples of evaluation sheet. (CC)

Suter, Patricia H.

1974-01-01

275

Enzymes in Analytical Chemistry.  

ERIC Educational Resources Information Center

Presents tabular information concerning recent research in the field of enzymes in analytic chemistry, with methods, substrate or reaction catalyzed, assay, comments and references listed. The table refers to 128 references. Also listed are 13 general citations. (CS)

Fishman, Myer M.

1980-01-01

276

Chemistry 455 Chemical Nanotechnology  

E-print Network

Chemistry 455 Chemical Nanotechnology 4 units Prof. Richard Brutchey, Fall 2014 (Lecture = 12:00�12:50 pm MWF) CHEM 455 is an upper-division undergraduate course in Chemical Nanotechnology. The intent

Rohs, Remo

277

Chemistry Wrap Up  

NSDL National Science Digital Library

Class activities and independent projects for high school students using household plastic wraps can help students understand more about the chemistry of everyday objects. The activities described in this article reinforce one of the fundamental principle

Pristera, Jeffrey M.; Lloyd, Jeremy M.; Wheeler, Steven E.

2000-04-01

278

ChemConnections  

NSDL National Science Digital Library

The mission of our program was: To develop new curricula, materials and methods to enhance the appreciation and learning of science, especially chemistry, for every undergraduate student such that all college graduates will command the knowledge and skills necessary to permit continued learning, to lead productive lives, and to make informed decisions.

279

CHEMISTRY 324W ORGANIC LABORATORY  

E-print Network

1 Fall 2010 CHEMISTRY 324W ORGANIC LABORATORY Course Information Title: Chemistry 324W, Organic for multiple chemistry classes) $5 key deposit fee (refunded at end of semester with return of key) Course a scientific paper consistent with the format of the Journal of Organic Chemistry, American Chemical Society. 7

Wagner, Diane

280

The Nobel Prize in Chemistry  

NSDL National Science Digital Library

The first hundred years of Nobel Prizes for Chemistry give a beautiful picture of the development of modern chemistry. The prizes cover the whole spectrum of the basic chemical sciences, from theoretical chemistry to biochemistry, and also a number of contributions to applied chemistry.

2001-01-01

281

Covalent fullerene chemistry  

Microsoft Academic Search

A brief introduction to the reactivity principles governing the covalent chemistry of fullerenes is provided. The combination of synthetic fullerene and acetylene chemistry gives access to a family of novel molecular carbon allotropes with interesting physical properties. A versatile strategy for the regioselective preparation of specific bis- through hexakis-adducts of C6o based on the tether-directed remote functionalization was developed. Large

FranGois Diederich

1997-01-01

282

Impact of surface chemistry  

PubMed Central

The applications of molecular surface chemistry in heterogeneous catalyst technology, semiconductor-based technology, medical technology, anticorrosion and lubricant technology, and nanotechnology are highlighted in this perspective. The evolution of surface chemistry at the molecular level is reviewed, and the key roles of surface instrumentation developments for in situ studies of the gas–solid, liquid–solid, and solid–solid interfaces under reaction conditions are emphasized. PMID:20880833

Somorjai, Gabor A.; Li, Yimin

2011-01-01

283

Nicotine Smoke Chemistry  

NSDL National Science Digital Library

The featured molecules this month come from the paper Using "Basic Principles" To Understand Complex Science: Nicotine Smoke Chemistry and Literature Analogies by Jeffrey Seeman detailing some of the complexities involved in the volatilization of two alkaloids, nicotine and cocaine. Students could be asked to identify how chemistry is involved in the various steps described in the paper, and most beginning students will be surprised to learn just how complex a process the volatilization of a molecule such as nicotine is.

284

NASA: Aura Atmospheric Chemistry  

NSDL National Science Digital Library

Aura is the EOS chemistry mission which aims to answer three important questions: is the ozone layer recovering, is air quality getting worse, and is the Earth's climate changing? Aura will continue the long term series of atmospheric chemistry measurements made by earlier missions. The Aura spacecraft operates in a 705 km sun-synchronous polar orbit, with an ascending equator crossing at 1:45 PM. On the site, visitors will find an overview of the mission, documentation, tools, links, and FAQs.

2007-05-14

285

Acid-base chemistry  

SciTech Connect

The book is not a research compendium and there are no references to the literature. It is a teaching text covering the entire range of undergraduate subject matter dealing with acid-base chemistry (some of it remotely) as taught in inorganic, analytical, and organic chemistry courses. The excellent chapters VII through IX deal in detail with the quantitative aspects of aqueous acid-base equilibria (salt hydrolysis and buffer, titrations, polyprotic and amphoteric substances).

Hand, C.W.; Blewit, H.L.

1985-01-01

286

EPA Environmental Chemistry Laboratory  

NASA Technical Reports Server (NTRS)

The Environmental Protection Agency's (EPA) Chemistry Laboratory (ECL) is a national program laboratory specializing in residue chemistry analysis under the jurisdiction of the EPA's Office of Pesticide Programs in Washington, D.C. At Stennis Space Center, the laboratory's work supports many federal anti-pollution laws. The laboratory analyzes environmental and human samples to determine the presence and amount of agricultural chemicals and related substances. Pictured, ECL chemists analyze environmental and human samples for the presence of pesticides and other pollutants.

1993-01-01

287

Quantitative quantum chemistry  

Microsoft Academic Search

We review the current status of quantum chemistry as a predictive tool of chemistry and molecular physics, capable of providing highly accurate, quantitative data about molecular systems. We begin by reviewing wave-function based electronic-structure theory, emphasizing the N-electron hierarchy of coupled-cluster theory and the one-electron hierarchy of correlation-consistent basis sets. Following a discussion of the slow basis-set convergence of dynamical

Trygve Helgaker; Wim Klopper; David P. Tew

2008-01-01

288

33 CFR 165.515 - Safety Zone: Cape Fear River, Wilmington, North Carolina.  

Code of Federal Regulations, 2010 CFR

...2010-07-01 false Safety Zone: Cape Fear River, Wilmington, North Carolina. 165... § 165.515 Safety Zone: Cape Fear River, Wilmington, North Carolina. (a...zone: (1) The waters of the Cape Fear River bounded by a line connecting the...

2010-07-01

289

33 CFR 165.515 - Safety Zone: Cape Fear River, Wilmington, North Carolina.  

Code of Federal Regulations, 2013 CFR

...2013-07-01 false Safety Zone: Cape Fear River, Wilmington, North Carolina. 165... § 165.515 Safety Zone: Cape Fear River, Wilmington, North Carolina. (a...zone: (1) The waters of the Cape Fear River bounded by a line connecting the...

2013-07-01

290

33 CFR 165.515 - Safety Zone: Cape Fear River, Wilmington, North Carolina.  

Code of Federal Regulations, 2012 CFR

...2012-07-01 false Safety Zone: Cape Fear River, Wilmington, North Carolina. 165... § 165.515 Safety Zone: Cape Fear River, Wilmington, North Carolina. (a...zone: (1) The waters of the Cape Fear River bounded by a line connecting the...

2012-07-01

291

33 CFR 165.515 - Safety Zone: Cape Fear River, Wilmington, North Carolina.  

Code of Federal Regulations, 2011 CFR

...2011-07-01 false Safety Zone: Cape Fear River, Wilmington, North Carolina. 165... § 165.515 Safety Zone: Cape Fear River, Wilmington, North Carolina. (a...zone: (1) The waters of the Cape Fear River bounded by a line connecting the...

2011-07-01

292

33 CFR 165.515 - Safety Zone: Cape Fear River, Wilmington, North Carolina.  

...2014-07-01 false Safety Zone: Cape Fear River, Wilmington, North Carolina. 165... § 165.515 Safety Zone: Cape Fear River, Wilmington, North Carolina. (a...zone: (1) The waters of the Cape Fear River bounded by a line connecting the...

2014-07-01

293

33 CFR 165.1120 - Security Zone; Naval Amphibious Base, San Diego, CA.  

Code of Federal Regulations, 2010 CFR

...Security Zone; Naval Amphibious Base, San Diego, CA. 165.1120 Section 165...Security Zone; Naval Amphibious Base, San Diego, CA. (a) Location. The...is a security zone: the waters of San Diego Bay, enclosed by lines connecting the following points:...

2010-07-01

294

33 CFR 165.1120 - Security Zone; Naval Amphibious Base, San Diego, CA.  

Code of Federal Regulations, 2011 CFR

...Security Zone; Naval Amphibious Base, San Diego, CA. 165.1120 Section 165...Security Zone; Naval Amphibious Base, San Diego, CA. (a) Location. The...is a security zone: the waters of San Diego Bay, enclosed by lines connecting the following points:...

2011-07-01

295

33 CFR 165.1120 - Security Zone; Naval Amphibious Base, San Diego, CA.  

Code of Federal Regulations, 2012 CFR

...Security Zone; Naval Amphibious Base, San Diego, CA. 165.1120 Section 165...Security Zone; Naval Amphibious Base, San Diego, CA. (a) Location. The...is a security zone: the waters of San Diego Bay, enclosed by lines connecting the following points:...

2012-07-01

296

33 CFR 165.1120 - Security Zone; Naval Amphibious Base, San Diego, CA.  

Code of Federal Regulations, 2013 CFR

...Security Zone; Naval Amphibious Base, San Diego, CA. 165.1120 Section 165...Security Zone; Naval Amphibious Base, San Diego, CA. (a) Location. The...is a security zone: the waters of San Diego Bay, enclosed by lines connecting the following points:...

2013-07-01

297

Main zones of the intertidal zone  

NSDL National Science Digital Library

The intertidal zone is found where the tides rise and fall daily, alternatively submerging and exposing the shore to ocean water. Organisms must be able to tolerate times of intense sunlight, little moisture, and wave forces.

Katie Hale (CSUF;Biological Sciences)

2007-06-08

298

Main zones of the intertidal zone  

NSDL National Science Digital Library

The intertidal zone is found where the tides rise and fall daily, alternatively submerging and exposing the shore to ocean water. Organisms must be able to tolerate times of intense sunlight, little moisture, and wave forces.

Katie Hale (California State University, Fullerton;Student, Biological Sciences)

2007-01-04

299

Higher Affine Connections  

E-print Network

For a smooth manifold $M$, it was shown in \\cite{BPH} that every affine connection on the tangent bundle $TM$ naturally gives rise to covariant differentiation of multivector fields (MVFs) and differential forms along MVFs. In this paper, we generalize the covariant derivative of \\cite{BPH} and construct covariant derivatives along MVFs which are not induced by affine connections on $TM$. We call this more general class of covariant derivatives \\textit{higher affine connections}. Related notions of \\textit{higher torsion} and \\textit{higher curvature} are considered also.

David N. Pham

2014-08-18

300

Integrating Webinar and Blogging Technologies into Chemistry Seminar  

ERIC Educational Resources Information Center

We report successfully integrating webinar and blogging into an undergraduate chemistry and biochemistry seminar course. Commercial collaboration software linked speaker-operated slides with two-way voice and video effectively connecting the audience and presenter from different states. Student responses to the technology and seminar content were…

Hamstra, Dan; Kemsley, Jyllian N.; Murray, Desmond H.; Randall, David W.

2011-01-01

301

VIRGINIA TECH CHEMISTRY ELECTRONIC SHOP -COMPUTER CHECK-IN  

E-print Network

Electronics Shop (103 Surge) Send back with stock room shuttle. OTHER: System cannot be moved. (Please makeVIRGINIA TECH ­ CHEMISTRY ELECTRONIC SHOP - COMPUTER CHECK-IN A separate form must be completed Hard Drive o Upgrade OS Operating System Boot Failure o Memory o MS Office Network Connectivity

Crawford, T. Daniel

302

Connectibles : tangible social networking  

E-print Network

This thesis presents "Connectibles," an instantiation of a tangible social network, a new type of social network application rooted in physical objects and real world social behavior. This research is inspired by social ...

Kalanithi, Jeevan James

2007-01-01

303

Nurturing Deep Connections.  

ERIC Educational Resources Information Center

Argues that the missing ingredient in school reform is soul, that is, deep connections among students, teachers, and administrators. Discusses five principles of leadership with soul: Personalize, pacing, permission, protection, and paradox. (PKP)

Kessler, Rachael

2002-01-01

304

Well Connected Mac  

NSDL National Science Digital Library

The Well Connected Mac aims to be a single entry point to all Macintosh resources on the Web. Check for software, online journals, product reviews, full hypertext versions of several Macintosh FAQ lists and more.

305

Quick connect fastener  

NASA Technical Reports Server (NTRS)

A quick connect fastener and method of use is presented wherein the quick connect fastener is suitable for replacing available bolts and screws, the quick connect fastener being capable of installation by simply pushing a threaded portion of the connector into a member receptacle hole, the inventive apparatus being comprised of an externally threaded fastener having a threaded portion slidably mounted upon a stud or bolt shaft, wherein the externally threaded fastener portion is expandable by a preloaded spring member. The fastener, upon contact with the member receptacle hole, has the capacity of presenting cylindrical threads of a reduced diameter for insertion purposes and once inserted into the receiving threads of the receptacle member hole, are expandable for engagement of the receptacle hole threads forming a quick connect of the fastener and the member to be fastened, the quick connect fastener can be further secured by rotation after insertion, even to the point of locking engagement, the quick connect fastener being disengagable only by reverse rotation of the mated thread engagement.

Weddendorf, Bruce (inventor)

1994-01-01

306

Probabilistic drug connectivity mapping  

PubMed Central

Background The aim of connectivity mapping is to match drugs using drug-treatment gene expression profiles from multiple cell lines. This can be viewed as an information retrieval task, with the goal of finding the most relevant profiles for a given query drug. We infer the relevance for retrieval by data-driven probabilistic modeling of the drug responses, resulting in probabilistic connectivity mapping, and further consider the available cell lines as different data sources. We use a special type of probabilistic model to separate what is shared and specific between the sources, in contrast to earlier connectivity mapping methods that have intentionally aggregated all available data, neglecting information about the differences between the cell lines. Results We show that the probabilistic multi-source connectivity mapping method is superior to alternatives in finding functionally and chemically similar drugs from the Connectivity Map data set. We also demonstrate that an extension of the method is capable of retrieving combinations of drugs that match different relevant parts of the query drug response profile. Conclusions The probabilistic modeling-based connectivity mapping method provides a promising alternative to earlier methods. Principled integration of data from different cell lines helps to identify relevant responses for specific drug repositioning applications. PMID:24742351

2014-01-01

307

Chemistry Student Handbook College of Science  

E-print Network

Chemistry Student Handbook College of Science React. Science #12;Contents 2 Welcome to the Department of Chemistry 2 Course Advice 3 What is Chemistry? 4 Career Profiles in Chemistry 5 An Undergraduate Degree in Chemistry 6 Chemistry Streams 13 Chemistry Honours Programme 14 Research

Hickman, Mark

308

Technetium Chemistry in HLW  

SciTech Connect

Tc contamination is found within the DOE complex at those sites whose mission involved extraction of plutonium from irradiated uranium fuel or isotopic enrichment of uranium. At the Hanford Site, chemical separations and extraction processes generated large amounts of high level and transuranic wastes that are currently stored in underground tanks. The waste from these extraction processes is currently stored in underground High Level Waste (HLW) tanks. However, the chemistry of the HLW in any given tank is greatly complicated by repeated efforts to reduce volume and recover isotopes. These processes ultimately resulted in mixing of waste streams from different processes. As a result, the chemistry and the fate of Tc in HLW tanks are not well understood. This lack of understanding has been made evident in the failed efforts to leach Tc from sludge and to remove Tc from supernatants prior to immobilization. Although recent interest in Tc chemistry has shifted from pretreatment chemistry to waste residuals, both needs are served by a fundamental understanding of Tc chemistry.

Hess, Nancy J.; Felmy, Andrew R.; Rosso, Kevin M.; Xia Yuanxian

2005-06-06

309

Theme-Based Bidisciplinary Chemistry Laboratory Modules  

NASA Astrophysics Data System (ADS)

A thematic approach to each of the two introductory chemistry laboratory sequences, general and organic chemistry, not only provides an element of cohesion but also stresses the role that chemistry plays as the "central science" and emphasizes the intimate link between chemistry and other science disciplines. Thus, in general chemistry the rubric "Environmental Chemistry" affords connections to the geosciences, whereas experiments on the topic of "Plant Assays" bridge organic chemistry and biology. By establishing links with other science departments, the theme-based laboratory experiments will satisfy the following multidisciplinary criteria: (i) to demonstrate the general applicability of core methodologies to the sciences, (ii) to help students relate concepts to a broader multidisciplinary context, (iii) to foster an attitude of both independence and cooperation that can transcend the teaching laboratory to the research arena, and (iv) to promote greater cooperation and interaction between the science departments. Fundamentally, this approach has the potential to impact the chemistry curriculum significantly by including student decision-making in the experimental process. Furthermore, the incorporation of GC-MS, a powerful tool for separation and identification as well as a state-of-the-art analytical technique, in the modules will enhance the introductory general and organic chemistry laboratory sequences by making them more instrument-intensive and by providing a reliable and reproducible means of obtaining quantitative analyses. Each multifaceted module has been designed to meet the following criteria: (i) a synthetic protocol including full spectral characterization of products, (ii) quantitative and statistical analyses of data, and (iii) construction of a database of results. The database will provide several concrete functions. It will foster the idea that science is a continuous incremental process building on the results of earlier experimentalists, it will reinforce an understanding of the scientific method by allowing students to propose testable hypotheses based on previous work, and it will generate a large body of quantitative data that can be used to illustrate the fundamentals of data analysis, including statistical measures of uncertainty. We have already developed several "Environmental Chemistry" modules for general chemistry, including monitoring for orthophosphate and nitrate concentrations in water using colorimetric analyses and assaying for gasoline contamination in water and soil samples using GC-MS. Another module dealing with herbicide residues in soil is still being explored. However, we purposefully choose here to emphasize the two modules that are under development for implementation in the organic chemistry laboratory sequence. The first "Plant Assay" project focuses on fatty acid methyl esters (FAMEs) and involves three discrete phases: (i) synthesis and characterization of FAME standards, (ii) isolation of the fatty acids (as FAMEs) from a variety of different plant leaves that will be collected by BIO 110 students on field trips, and (iii) qualitative and quantitative analysis of the plant leaf extract for whole-leaf lipid composition. Acid-catalyzed Fischer esterification of carboxylic acids in methanol is a standard methodology for the preparation of methyl esters. A textbook procedure (1) for the synthesis of ethyl laurate has been employed, with good success, to prepare eight FAMEs in yields of ca. 70%. Conversion of leaf phospholipids to FAMEs proceeds readily via a transesterification reaction. Treatment of the whole leaf in a methanolic HCl solution for an hour at 80 °C (2) is sufficient after extraction in hexane to provide a suitable sample for GC-MS analysis. Preliminary results obtained with an HP GCD system indicate that GC-MS will afford highly reliable quantitative data on FAME lipid composition. Possible extensions of the project include using boron trifluoride in methanol to effect transesterification (3) and examini

Leber, Phyllis A.; Szczerbicki, Sandra K.

1996-12-01

310

Introduction to Ocean Zones  

NSDL National Science Digital Library

In this activity, learners will create a diagram of the ocean zones and determine what organisms live in each zone. Learners will draw the appropriate scale to demark meters (and conversion to feet) from 0-6000m and draw the zones that correspond to the geological structures of the ocean basin. Finally, learners will use their critical thinking skills to determine where in the ocean each organism lives and place the organism in the habitat that is within the limitations for survival.

West, Cosee

2012-01-01

311

Kane Fracture Zone  

Microsoft Academic Search

The Kane Fracture Zone probably is better covered by geophysical survey data, acquired both by design and incidentally, than\\u000a any other fracture zone in the North Atlantic Ocean. We have used this data to map the basement morphology of the fracture\\u000a zone and the adjacent crust for nearly 5700 km, from near Cape Hatteras to the middle of the Mesozoic

Brian E. Tucholke; Hans Schouten

1988-01-01

312

Science360: Chemistry  

NSDL National Science Digital Library

Have you ever wondered about the chemistry of a cheeseburger? Well you are in luck because that is one of the subjects covered on the topical and delightful "Chemistry" section of the popular Science360 website. As it states on the site, "everything you hear, see, taste, smell and touch involves chemistry and chemicals", and here visitors can watch videos and learn about the molecular structure of water, the science behind glass blowing, and how a curious mud-like mixture is being used to soak up oil spills and insulate homes. Currently, there are about fifteen videos on the site, and visitors can sign up via a host of social media (Twitter, Facebook, and so on), to stay abreast of new additions to the site. Teachers will find that this material can be integrated into the classroom quite easily, and everyone else will just enjoy wandering through these offerings.

313

Macs in Chemistry  

NSDL National Science Digital Library

Using computers to do science is a great way to get young people hooked on the enterprise, and mobile apps and other devices make this easier than ever. The Macs in Chemistry site features dozens of applications that will help users learn about chemistry (and more) through interactive activities, quizzes, and so on. In the At a Glance area, visitors can learn about the tutorials archived here, data analysis tools, and mobile science apps. This last section is a real gem, as it contains dozens of applications including everything from 29 interactive maps of the brain to chemistry formula exercises to a working seismograph. The rest of the applications are divided into alphabetical sections. Visitors should click on the Software Reviews area for timely and detailed reviews of each application's strengths and weaknesses. The site is rounded out by a contact form and a set of useful links.

314

Reaction chemistry of cerium  

SciTech Connect

It is truly ironic that a synthetic organic chemist likely has far greater knowledge of the reaction chemistry of cerium(IV) than an inorganic colleague. Cerium(IV) reagents have long since been employed as oxidants in effecting a wide variety of organic transformations. Conversely, prior to the late 1980s, the number of well characterized cerium(IV) complexes did not extend past a handful of known species. Though in many other areas, interest in the molecular chemistry of the 4f-elements has undergone an explosive growth over the last twenty years, the chemistry of cerium(IV) has for the most part been overlooked. This report describes reactions of cerium complexes and structure.

NONE

1997-01-01

315

Digital biology and chemistry.  

PubMed

This account examines developments in "digital" biology and chemistry within the context of microfluidics, from a personal perspective. Using microfluidics as a frame of reference, we identify two areas of research within digital biology and chemistry that are of special interest: (i) the study of systems that switch between discrete states in response to changes in chemical concentration of signals, and (ii) the study of single biological entities such as molecules or cells. In particular, microfluidics accelerates analysis of switching systems (i.e., those that exhibit a sharp change in output over a narrow range of input) by enabling monitoring of multiple reactions in parallel over a range of concentrations of signals. Conversely, such switching systems can be used to create new kinds of microfluidic detection systems that provide "analog-to-digital" signal conversion and logic. Microfluidic compartmentalization technologies for studying and isolating single entities can be used to reconstruct and understand cellular processes, study interactions between single biological entities, and examine the intrinsic heterogeneity of populations of molecules, cells, or organisms. Furthermore, compartmentalization of single cells or molecules in "digital" microfluidic experiments can induce switching in a range of reaction systems to enable sensitive detection of cells or biomolecules, such as with digital ELISA or digital PCR. This "digitizing" offers advantages in terms of robustness, assay design, and simplicity because quantitative information can be obtained with qualitative measurements. While digital formats have been shown to improve the robustness of existing chemistries, we anticipate that in the future they will enable new chemistries to be used for quantitative measurements, and that digital biology and chemistry will continue to provide further opportunities for measuring biomolecules, understanding natural systems more deeply, and advancing molecular and cellular analysis. Microfluidics will impact digital biology and chemistry and will also benefit from them if it becomes massively distributed. PMID:24889331

Witters, Daan; Sun, Bing; Begolo, Stefano; Rodriguez-Manzano, Jesus; Robles, Whitney; Ismagilov, Rustem F

2014-09-01

316

Algebraic connectivity and graph robustness.  

SciTech Connect

Recent papers have used Fiedler's definition of algebraic connectivity to show that network robustness, as measured by node-connectivity and edge-connectivity, can be increased by increasing the algebraic connectivity of the network. By the definition of algebraic connectivity, the second smallest eigenvalue of the graph Laplacian is a lower bound on the node-connectivity. In this paper we show that for circular random lattice graphs and mesh graphs algebraic connectivity is a conservative lower bound, and that increases in algebraic connectivity actually correspond to a decrease in node-connectivity. This means that the networks are actually less robust with respect to node-connectivity as the algebraic connectivity increases. However, an increase in algebraic connectivity seems to correlate well with a decrease in the characteristic path length of these networks - which would result in quicker communication through the network. Applications of these results are then discussed for perimeter security.

Feddema, John Todd; Byrne, Raymond Harry; Abdallah, Chaouki T. (University of New Mexico)

2009-07-01

317

Chemistry and materials science  

SciTech Connect

Our work in chemistry and materials science exemplifies disciplinary research and programmatic support. The disciplinary research is intended to sharpen the skills of our scientists, advance the frontiers of scientific knowledge, and provide the seeds for programs of the future. The programmatic support provides the very best scientific and engineering talent for Laboratory programs and offers the potential for new program areas. We are convinced that chemistry and materials science will be key to the future success of the Laboratory whatever its mission, and we are firmly committed to supporting this mission with the very best in scientific talent.

NONE

1995-01-01

318

Chemistry in cometary comae  

NASA Technical Reports Server (NTRS)

Significant gas-phase chemistry occurs in the comae of bright comets, as is demonstrated here for the case of Comet Hale-Bopp. The abundance ratio of the two isomers, hydrogen cyanide and hydrogen isocyanide, is shown to vary with heliocentric distance in a way that is consistent with production of HNC by ion-molecule chemistry initiated by the photoionization of water. Likewise, the first maps of emission from HCO+ show an abundance and an extended distribution that are consistent with the same chemical model.

Irvine, W. M.; Dickens, J. E.; Lovell, A. J.; Schloerb, F. P.; Senay, M.; Bergin, E. A.; Jewitt, D.; Matthews, H. E.

1998-01-01

319

EnvironmentalChemistry.com  

NSDL National Science Digital Library

Produced by Kenneth Barbalace with help from Roberta and Julia Barbalace, the EnvironmentalChemistry.com website supplies innumerable environmental, chemistry, and hazardous materials information and resources. Under the Environmental Issues header, students can learn about the chemical and physical properties of asbestos, the Chernobyl disaster, and the proper way to handle household chemicals. One of the newest additions to the website is the Emergency Response Guidebook, which is used during a Dangerous goods / Hazardous Materials incident. The numerous, in-depth chemical resources include a directory of common chemicals used in industry and household products, an article explaining the structure of atoms, and a periodic table with data on elements' properties.

320

Chemistry WebBook  

National Institute of Standards and Technology Data Gateway

SRD 69 NIST Chemistry WebBook (Web, free access)   The NIST Chemistry WebBook contains: Thermochemical data for over 7000 organic and small inorganic compounds; thermochemistry data for over 8000 reactions; IR spectra for over 16,000 compounds; mass spectra for over 33,000 compounds; UV/Vis spectra for over 1600 compounds; electronic and vibrational spectra for over 5000 compounds; constants of diatomic molecules(spectroscopic data) for over 600 compounds; ion energetics data for over 16,000 compounds; thermophysical property data for 74 fluids.

321

Chemistry in water reactors. Reserapport. (Chemistry in water reactors).  

National Technical Information Service (NTIS)

The international conference Chemistry in Water Reactors was arranged in Nice 24-27/04/1994 by the French Nuclear Energy Society. Examples of technical program areas were primary chemistry, operational experience, fundamental studies and new technology. F...

H. P. Hermansson, K. Norring

1994-01-01

322

ArtsConnectEd  

NSDL National Science Digital Library

ArtsConnectEd is an Internet-based gateway to allow teachers, students, and parents to access the combined educational resources of the Walker Art Center and The Minneapolis Institute of Arts. Although still under development, ArtsConnectEd already offers several useful sections, including classroom resources, discussions, and tours of the museums. Teachers can easily search for grade-appropriate curriculum materials, some of which are available online, while others, such as videos or slide sets with accompanying texts, must be ordered from the museums. Eventually, ArtsConnectEd will contain a huge variety of art museum information resources including text, images, audio, video, hypermedia, 3-D models and animation related to collection information, library card catalogues, object label and didactic panel copy, exhibition and institutional archives, and full-text publications.

323

Inert electrode connection  

DOEpatents

An inert electrode connection is disclosed wherein a layer of inert electrode material is bonded to a layer of conductive material by providing at least one intermediate layer of material therebetween comprising a predetermined ratio of inert material to conductive material. In a preferred embodiment, the connection is formed by placing in a die a layer of powdered inert material, at least one layer of a mixture of powdered inert material and conductive material, and a layer of powdered conductive material. The connection is then formed by pressing the material at 15,000-20,000 psi to form a powder compact and then densifying the powder compact in an inert or reducing atmosphere at a temperature of 1200.degree.-1500.degree. C.

Weyand, John D. (Greensburg, PA); Woods, Robert W. (New Kensington, PA); DeYoung, David H. (Plum Boro, PA); Ray, Siba P. (Plum Boro, PA)

1985-01-01

324

Inert electrode connection  

DOEpatents

An inert electrode connection is disclosed wherein a layer of inert electrode material is bonded to a layer of conductive material by providing at least one intermediate layer of material therebetween comprising a predetermined ratio of inert material to conductive material. In a preferred embodiment, the connection is formed by placing in a die a layer of powdered inert material, at least one layer of a mixture of powdered inert material and conductive material, and a layer of powdered conductive material. The connection is then formed by pressing the material at 15,000--20,000 psi to form a powder compact and then densifying the powder compact in an inert or reducing atmosphere at a temperature of 1,200--1,500 C. 5 figs.

Weyand, J.D.; Woods, R.W.; DeYoung, D.H.; Ray, S.P.

1985-02-19

325

Connective field modeling.  

PubMed

The traditional way to study the properties of visual neurons is to measure their responses to visually presented stimuli. A second way to understand visual neurons is to characterize their responses in terms of activity elsewhere in the brain. Understanding the relationships between responses in distinct locations in the visual system is essential to clarify this network of cortical signaling pathways. Here, we describe and validate connective field modeling, a model-based analysis for estimating the dependence between signals in distinct cortical regions using functional magnetic resonance imaging (fMRI). Just as the receptive field of a visual neuron predicts its response as a function of stimulus position, the connective field of a neuron predicts its response as a function of activity in another part of the brain. Connective field modeling opens up a wide range of research opportunities to study information processing in the visual system and other topographically organized cortices. PMID:23110879

Haak, Koen V; Winawer, Jonathan; Harvey, Ben M; Renken, Remco; Dumoulin, Serge O; Wandell, Brian A; Cornelissen, Frans W

2013-02-01

326

Our Cosmic Connection  

NSDL National Science Digital Library

This article discusses how the evolution of stars from birth in giant clouds of gas and dust to death in catastrophic explosions sets the stage for planets and life to form. This article provides information about the Chandra X-Ray Center (CXC) educational website that contains a stellar evolution module that is available free to teachers (see the box Our Cosmic Connection clasroom activity on page 30 for website information). The stellar evolution activity uses multi-wavelength images of stellar nurseries, supernovae, neutron stars, pulsars, and black holes to investigate stellar life cycles and their connection to planet Earth.

Young, Donna L.

2005-02-01

327

Determination of effective brain connectivity from functional connectivity with application to resting state connectivities  

NASA Astrophysics Data System (ADS)

Neural field theory insights are used to derive effective brain connectivity matrices from the functional connectivity matrix defined by activity covariances. The symmetric case is exactly solved for a resting state system driven by white noise, in which strengths of connections, often termed effective connectivities, are inferred from functional data; these include strengths of connections that are underestimated or not detected by anatomical imaging. Proximity to criticality is calculated and found to be consistent with estimates obtainable from other methods. Links between anatomical, effective, and functional connectivity and resting state activity are quantified, with applicability to other complex networks. Proof-of-principle results are illustrated using published experimental data on anatomical connectivity and resting state functional connectivity. In particular, it is shown that functional connection matrices can be used to uncover the existence and strength of connections that are missed from anatomical connection matrices, including interhemispheric connections that are difficult to track with techniques such as diffusion spectrum imaging.

Robinson, P. A.; Sarkar, S.; Pandejee, Grishma Mehta; Henderson, J. A.

2014-07-01

328

The Birthday of Organic Chemistry.  

ERIC Educational Resources Information Center

Describes how the synthesis of urea, 150 years ago, was a major factor in breaking the artificial barrier that existed between organic and inorganic chemistry, and this contributed to the rapid growth of organic chemistry. (GA)

Benfey, Otto Theodor; Kaufman, George B.

1979-01-01

329

The World of Chemistry: Essentials  

NSDL National Science Digital Library

Finds ChemEd DL resources related to the sections of the General Chemistry textbook, The World of Chemistry: Essentials, by Melvin Joesten, Mary E. Castellion, John L. Hogg published by Brooks/Cole, 2007.

330

Organic Chemistry, 5th Edition  

NSDL National Science Digital Library

Finds ChemEd DL resources related to the sections of the Organic Chemistry textbook, Organic Chemistry, 5th Edition, by William H. Brown, Christopher S. Foote, Brent L. Iverson, Eric Anslyn published by Brooks/Cole, 2009.

331

General Chemistry, 9th Edition  

NSDL National Science Digital Library

Finds ChemEd DL resources related to the sections of the General Chemistry textbook, General Chemistry, 9th Edition, by Darrell D. Ebbing, Steven D. Gammon published by Houghton Mifflin Company, 2007.

332

About the New Chemistry Curriculum.  

ERIC Educational Resources Information Center

Reviews the recently established curriculum for teaching chemistry in the Soviet Union. Examines guidelines for teaching methodology. Also looks at basic pupil knowledge and skills in several different areas of chemistry. (RKM)

Ivanova, R. G.

1987-01-01

333

Teaching Introductory Organic Chemistry: 'Blooming' beyond a Simple Taxonomy  

NASA Astrophysics Data System (ADS)

Undergraduate students often experience fear and trepidation when studying introductory organic chemistry: the majority of these students use a memorization approach to the material, sacrificing understanding. This paper describes one way the problem can be resolved. The cognitive working level we emphasize in our teaching practice involves making the necessary connections between the general chemistry principles that students have learned (or at least have been exposed to in their senior high school years and have revisited again in their university freshman year) and the many reactions and mechanisms they will encounter in organic chemistry. Educating students early in the course about the various levels of the cognitive process and the necessary working level of cognition for success in organic chemistry teaches connections between the general chemistry principles and reaction mechanisms. This empowers students to approach the subject from a perspective of understanding rather than memorization, and replaces fear and trepidation with confidence. In addition, this can help narrow the gap between what instructors expect from their students and what their students think is sufficient to master the course content.

Pungente, Michael D.; Badger, Rodney A.

2003-07-01

334

SmartConnect: Data connectivity for peripheral health facilities  

E-print Network

SmartConnect: Data connectivity for peripheral health facilities Richard Anderson, Eric Blantz/15/2010 2NSDR 2010 The town of Nueva Guinea has few facilities, but the curious traveler may appreciate connection for rural health facilities ­ Which processes can be improved with network connectivity? · Needs

Anderson, Richard

335

Float Zone Workshop  

NASA Technical Reports Server (NTRS)

A summary of the Analytical Float Zone Experiment System (AFZES) concept is presented. The types of experiments considered for such a facility are discussed. Reports from various industrial producers and users of float zone material are presented. Special emphasis is placed on state-of-the-art developments in low gravity manufacturing and their applications to space processing.

Naumann, R. J.

1980-01-01

336

Changes in Hardiness Zones  

NSDL National Science Digital Library

This animation illustrates how the hardiness zones for plants have changed between 1990 and 2006 based on an extensive updating of U.S. Hardiness Zones using data from 5,000 National Climatic Data Center cooperative stations across the continental United States.

Foundation, Arbor D.

337

Service-Learning in Introductory Chemistry: Supplementing Chemistry Curriculum in Elementary Schools  

NASA Astrophysics Data System (ADS)

The pedagogy of service-learning is becoming an accepted method of connecting college classrooms to the community. A service-learning course component has been successfully incorporated into the second quarter of Introductory Chemistry (Chem 120) at Kalamazoo College. Students in Chem 120 design inquiry-based laboratory experiments related to course material for students in grades K 6. The Chem 120 students then conduct these experiments with assigned classes at a local elementary school. This project reinforces course material for the college students while supplementing the elementary school's science curriculum and exposing children to topics they otherwise would not learn. In addition to providing a context for college students to make connections between textbook concepts and real life processes, this project also offers a chance to improve other skills, such as problem solving and communication. Surveys of the Chem 120 students and comments from the elementary school community demonstrate that the project is successful overall and is a way to interest students at all levels in chemistry. This paper discusses the methods used to conduct and assess this service-learning project, survey results, comments from the elementary school community, and the effect of this project on the number of chemistry majors at Kalamazoo College.

Esson, Joan M.; Stevens-Truss, Regina; Thomas, Anne

2005-08-01

338

Chemistry by the Case  

NSDL National Science Digital Library

This article describes the structure and content of a one-semester course dealing with chemistry, science, and technology designed for nonscience majors. The course uses a hybrid of two active learning methodologies--problem-based team learning and the cas

Dinan, Frank J.

2002-09-01

339

Microscale Gas Chemistry  

ERIC Educational Resources Information Center

The development of syringes having free movement while remaining gas-tight enabled methods in chemistry to be changed. Successfully containing and measuring volumes of gas without the need to trap them using liquids made it possible to work with smaller quantities. The invention of the LuerLok syringe cap also allowed the gas to be stored for a…

Mattson, Bruce; Anderson, Michael P.

2011-01-01

340

The Pimlico Chemistry Trail.  

ERIC Educational Resources Information Center

Describes a chemistry "trail" (similar to a nature trail) which focuses on chemical phenomena in the environment. The trail includes 20 stops in and around a local school. Types of phenomena examined include building materials, air pollution, corrosion of metals, swimming pools, and others. Additional activities are also suggested. (DH)

Borrows, Peter

1984-01-01

341

The Chemistry of Health.  

ERIC Educational Resources Information Center

This booklet, geared toward an advanced high school or early college-level audience, describes how basic chemistry and biochemistry research can spur a better understanding of human health. It reveals how networks of chemical reactions keep our bodies running smoothly. Some of the tools and technologies used to explore these reactions are…

National Inst. of General Medical Sciences (NIH), Bethesda, MD.

342

The chemistry of fullerenes  

Microsoft Academic Search

Initially envisaged as rather unreactive, aromatic-like molecules, the fullerenes instead undergo a wide variety of reactions characteristic of alkenes. The many derivatives of C60, and the few of C70, that have now been reported offer new directions for organic chemistry.

Roger Taylor; David R. M. Walton

1993-01-01

343

Surface Chemistry at Michigan  

NSDL National Science Digital Library

This site from the University of Michigan provides links to in-depth discussions and informational images of the research projects of its four surface chemistry research groups. Visitors to the site can find slide show presentations of the group's work, lists of its publications, and information on the individual researchers' education and work.

2008-02-19

344

Chemistry Between The Stars.  

ERIC Educational Resources Information Center

This booklet is part of an American Astronomical Society curriculum project designed to provide teaching materials to teachers of secondary school chemistry, physics, and earth science. The following topics are covered: the physical conditions in interstellar space in comparison with those of the earth, particularly in regard to gas density,…

Gammon, Richard H.

345

ATMOSPHERIC CHEMISTRY VALIDATION STATUS  

Microsoft Academic Search

Three atmospheric-chemistry sensors form part of the ENVISAT payload that has been placed into orbit in March 2002. This paper presents reviews the end-to- end performance of the GOMOS, MIPAS and SCIAMACHY observation systems and will discuss the product quality control assessment of these instruments. An important part of the quality assessment is the Geophysical Validation. At the ACVT Validation

Paul Snoeij; Thorsten Fehr; Rob Koopman; Pascal Lecomte

346

CHEMISTRY 450 Spring, 2009  

E-print Network

January): Philosophers of Science; Group Presentations Journals: A-C WEEK 3 (21 January): Sociology of Science Journals: D-G WEEK 4 (28 January): Green Chemistry Journals: H-N WEEK 5 (4 February): Green to change. #12;CH 450 Spring, 2009 -2- Course Outline (Tentative) Journal due dates are designated each week

Stuart, Steven J.

347

Identifying Chemistry Teachers' Beliefs  

ERIC Educational Resources Information Center

The main goal of the study was to describe and understand the development of beliefs related to the thinking and decision-making made by five teachers in teaching chemistry during a two-year intervention study. The participating teachers implemented and, in the second year of the study, developed teaching modules which were geared to the promotion…

Vaino, Katrin

2009-01-01

348

Array processors in chemistry  

SciTech Connect

The field of attached scientific processors (''array processors'') is surveyed, and an attempt is made to indicate their present and possible future use in computational chemistry. The current commercial products from Floating Point Systems, Inc., Datawest Corporation, and CSP, Inc. are discussed.

Ostlund, N.S.

1980-01-01

349

Online organic chemistry  

NASA Astrophysics Data System (ADS)

This is a comprehensive study of the many facets of an entirely online organic chemistry course. Online homework with structure-drawing capabilities was found to be more effective than written homework. Online lecture was found to be just as effective as in-person lecture, and students prefer an online lecture format with shorter Webcasts. Online office hours were found to be effective, and discussion sessions can be placed online as well. A model was created that explains 36.1% of student performance based on GPA, ACT Math score, grade in previous chemistry course, and attendance at various forms of discussion. Online exams have been created which test problem-solving skills and is instantly gradable. In these exams, students can submit answers until time runs out for different numbers of points. These facets were combined effectively to create an entirely online organic chemistry course which students prefer over the in-person alternative. Lastly, there is a vision for where online organic chemistry is going and what can be done to improve education for all.

Janowicz, Philip A.

350

Chemistry and Heritage  

NASA Astrophysics Data System (ADS)

Chemistry is the central science, as it touches every aspect of the society we live in and it is intertwined with many aspects of our culture; in particular, the strong link between Chemistry and Archaeology and Art History is being explored, offering a penetrating insight into an area of growing interest from an educational point of view. A series of vital and vibrant examples (i.e., ancient bronzes composition, colour changes due to natural pigment decomposition, marble degradation) has been proposed, on one hand, to improve student understanding of the relationship between cultural and scientific issues arising from the examination, the conservation, and the maintenance of cultural Heritage, on the other, to illustrate the role of the underlying Chemistry. In some case studies, a survey of the most relevant atmospheric factors, which are involved in the deterioration mechanisms, has also been presented to the students. First-hand laboratory experiences have been providing an invaluable means of discovering the full and varied world of Chemistry. Furthermore, the promotion of an interdisciplinary investigation of a famous painting or fresco, involving the study of its nature and significance, the definition of its historical context, any related literature, the chemical knowledge of the materials used, may be an excellent occasion to experiment the Content and Language Integrated Learning (CLIL). The aim of this approach is to convey the important message that everyone has the responsibility to care for and preserve Heritage for the benefit of present and future generations.

Vittoria Barbarulo, Maria

2014-05-01

351

Chemistry by Computer.  

ERIC Educational Resources Information Center

Describes the features of various computer chemistry programs. Utilization of computer graphics, color, digital imaging, and other innovations are discussed in programs including those which aid in the identification of unknowns, predict whether chemical reactions are feasible, and predict the biological activity of xenobiotic compounds. (CS)

Garmon, Linda

1981-01-01

352

Evaluating Environmental Chemistry Textbooks.  

ERIC Educational Resources Information Center

A director of the Indiana University Center for Environmental Science Research reviews textbooks on environmental chemistry. Highlights clear writing, intellectual depth, presence of problem sets covering both the qualitative and quantitative aspects of the material, and full coverage of the topics of concern. Discusses the director's own approach…

Hites, Ronald A.

2001-01-01

353

Myrrh--Commiphora chemistry.  

PubMed

Myrrh and opopanax has been used throughout history in incense and as a perfume. Since Bible times it has been used for the treatment of wounds. The first attempts to identify content compounds were almost 100 years ago. In this review we discuss the present state of knowledge in the chemistry of substances of Commiphora spp. PMID:16170385

Hanus, Lumír O; Rezanka, Tomás; Dembitsky, Valery M; Moussaieff, Arieh

2005-06-01

354

Chemistry & Biology Brief Communication  

E-print Network

Laboratory of Medicinal Chemistry, Department of Pharmacy and Pharmacology, University of Bath, Bath BA2 7AY plant-type chitinase reveals that the compound binds the catalytic machinery in the same manner Compounds isolated from natural sources, natural products, provide a wealth of bioactives that in some cases

van Aalten, Daan

355

Green chemistry metrics  

EPA Science Inventory

Synthetic chemists have always had an objective to achieve reliable and high-yielding routes to the syntheses of targeted molecules. The importance of minimal waste generation has emphasized the use of green chemistry principles and sustainable development. These directions lead ...

356

Chemistry in the Troposphere.  

ERIC Educational Resources Information Center

Topics addressed in this review of chemistry in the troposphere (layer of atmosphere extending from earth's surface to altitude of 10-16km) include: solar radiation/winds; earth/atmosphere interface; kinetic studies of atmospheric reactions; tropospheric free-radical photochemistry; instruments for nitric oxide detection; sampling…

Chameides, William L.; Davis, Douglas D.

1982-01-01

357

The Language of Chemistry.  

ERIC Educational Resources Information Center

Describes a new curriculum called The Language of Chemistry designed to illustrate how problems of biological and/or medical importance can be understood on a molecular basis and to show that the logic, knowledge, and language needed are easily accessible. Among the case studies in the curriculum are the giant peacock moth, bacterial chemotaxis,…

Bretz, Stacey Lowery; Meinwald, Jerrold

2002-01-01

358

Chemistry Department Emergency Action &  

E-print Network

phone. You should call 9-1-1: In the event of a medical emergency To report all fire incidents, even1 Chemistry Department Emergency Action & Evacuation Plan In compliance with: California Code;2 Introduction An Emergency Action & Evacuation Plan (herein referred to as an EAP) covers designated actions

Guo, Ting

359

Chemistry Reference Sheets  

NSDL National Science Digital Library

This reference sheet, presented by the National Nanotechnology Infrastructure Network provides a valuable chemistry reference sheet for high school students. Definition of terms, diagrams, abbreviations, mathematical notations, the periodic table, and other useful information is provided in an easy to use format. Included in this lesson are the front and back sides of this reference sheet.

2014-07-25

360

The Lens of Chemistry  

ERIC Educational Resources Information Center

Chemistry possesses a distinctive theoretical lens--a distinctive set of theoretical concerns regarding the dynamics and transformations of a perplexing variety of organic and nonorganic substances--to which it must be faithful. Even if it is true that chemical facts bear a special (reductive) relationship to physical facts, nonetheless it will…

Thalos, Mariam

2013-01-01

361

The Outlook from Chemistry.  

ERIC Educational Resources Information Center

Solutions to many of the great problems facing society will be found through interdisciplinary research, and environmental problems are a prime target for such an approach. In tackling these problems, it would be a great mistake, however, to weaken the classical disciplinary departments. More than 60 new chemistry departments were created since…

Cairns, T. L.

362

Tie-Dye Chemistry  

NSDL National Science Digital Library

In their travels to the indigo dye pits of northern Nigeria, the authors were struck by the beauty, history, and chemistry of indigo dyeing. They returned from Nigeria eager to develop a laboratory exercise that would expose students to the science of ind

Cessna, Gretchen; Cessna, Stephen

2001-03-01

363

Virginia Tech Chemistry Department  

E-print Network

and respect our differences while affirming our common humanity. We reject all forms of prejudice and discrimination, including those based on age, color, disability, gender, national origin, political affiliation 2012) Chemistry Graduate Program. http://www.chem.vt.edu/grad/index.html Grad School Policies. http

Crawford, T. Daniel

364

Get Cooking with Chemistry!  

ERIC Educational Resources Information Center

This book presents science activities investigating the chemical changes and reactions with powders that are used in baking. Activities include: (1) Mystery Powders; (2) Find the Fizz: Discover the Secret of Baking Powder; and (3) A Feast for Yeast and Cheese: Behold the Power of Chemistry. (YDS)

American Chemical Society, Washington, DC.

365

Greener and Sustainable Chemistry  

EPA Science Inventory

The special issue on Greener and Sustainable Chemistry highlights various strategies that can be adopted to address the pollution preventive measures promoting the use of energy efficient reactions that utilize benign and bio-renewable raw materials in a relatively safer reaction...

366

News: Green Chemistry & Technology  

EPA Science Inventory

A series of 21 articles focused on different features of green chemistry in a recent issue of Chemical Reviews. Topics extended over a wide range to include the design of sustainable synthetic processes to biocatalysis. A selection of perspectives follows as part of this colu...

367

Long-Distance Connection  

ERIC Educational Resources Information Center

Transient populations, cultural diversity, language barriers, competing loyalties, and geographic separation are just some of the challenges international schools face in communicating and connecting with their alumni. And these issues are not going to get any easier as the sector grows. Communicating effectively with large, diverse groups of…

Clift, Kate

2010-01-01

368

The Game Port Connection.  

ERIC Educational Resources Information Center

Provides ideas for using the same port connection of personal computers to interface with laboratory instruments. Contains specific instructions on how to build transducers. Includes plans and diagrams for thermistors and light meters as well as computer programs for displaying instrument readings on monitors. (TW)

Sievers, Dennis

1986-01-01

369

Connecting Cosmology and Colliders  

E-print Network

The broad connections between cosmology and collider physics, particularly precision measurements at the high-energy frontier, are discussed. These proceedings summarize a colloquium delivered to a general audience of experimental and theoretical particle and collider physicists at the International Conference on Linear Colliders (LCWS2004) in Paris.

Mark Trodden

2004-07-01

370

Connectivity in Digital Pictures  

Microsoft Academic Search

Natural concepts of connectedness and simple-connectedness are defined for subsets of a digital picture. It is shown that every simply-connected object (with more than one element) in such a picture has elements which can be deleted without destroying its simple- connectedness. This makes it easy to prove that a well-known \\

Azriel Rosenfeld

1970-01-01

371

Making the Connection  

ERIC Educational Resources Information Center

Enrollment marketing is not just about enrollment; it is about creating relationships and serving one's community or target audience for many years. In this article, the author states that the first step in building such relationships is making a connection, and that is what effective marketing is all about. Administrators, teachers and critical…

Perna, Mark C.

2006-01-01

372

Super Science Connections  

NASA Astrophysics Data System (ADS)

The Super Science Connections workbook was developed by teachers, specifically for K-3 teachers. It contains relevant and fun hands-on activities centered around science concepts or science process skills. It smoothly integrates physical science and life science with other areas of the curriculum: math, health, social studies, art, writing, and children's literature.

McKean, Patricia B.

1999-07-01

373

Parabolically connected subgroups  

SciTech Connect

All reductive spherical subgroups of the group SL(n) are found for which the intersections with every parabolic subgroup of SL(n) are connected. This condition guarantees that open equivariant embeddings of the corresponding homogeneous spaces into Moishezon spaces are algebraic. Bibliography: 6 titles.

Netai, Igor V [M. V. Lomonosov Moscow State University, Faculty of Mechanics and Mathematics, Moscow (Russian Federation)

2011-08-31

374

Foinaven subsea system connection  

SciTech Connect

The Diverless Maintained Cluster (DMaC) system has progressed from initial concept to deepwater application in the harsh environment West of Shetland. The paper provides a brief history of the development of DMaC, a description of the flowline and umbilical connection used on Foinaven and an explanation of some of the issues involved in applying the concept to a specific development.

White, J.; Moore, C.; Sen, P.

1996-12-31

375

Connect the Dots (polygons)  

NSDL National Science Digital Library

The purpose of this activity is to familiarize the student with the basic shapes and types of polygons. Using an activity that most have done and seen in their childhood like "connect the dots", it will be easier for the student to recognize and memorize the shapes and types of polygons.

2010-01-01

376

The Human Connection  

ERIC Educational Resources Information Center

Without effective classroom management, teaching and learning cannot take place. The responsibility for a teacher's success in the classroom lies as much in the human connection between administrator and teacher as between teacher and student. In fact, it lies with all who work with schools: universities, school boards, administrators, and…

Holliday, Christina O.

2005-01-01

377

Connections Transport Layer  

E-print Network

Transmission Control Protocol IP Header TCP Header TCP Transmission Policy Timer Management 4 User Datagram A: ACK B A: DR A B: ACK Ramkumar TL #12;Services Connections TCP UDP IP Header TCP Header TCP TCP UDP IP Header TCP Header TCP Transmission Policy Timer Management TCP/IP Technically a transport

Ramkumar, Mahalingam

378

The Connection Machine  

Microsoft Academic Search

This book describes what history may judge to be the second stage in the evolution of digital computers. Up to now, all computers have had basically the same architecture: one or a few large memory banks. Challenging that conception, the Connection Machine links together thousands or millions of extremely small processors and memories. From each moment to the next, the

W. Daniel Hillis

1985-01-01

379

Connections across the Disciplines.  

ERIC Educational Resources Information Center

Suggested is an approach to general biology which may be effective in sustaining student interest and infusing an appreciation for science. The goal of the approach is to foster life-long learning and capability to make connections and draw inferences. Examples using the levels of biotic organization are given. (CW)

Bicak, Charles J.; Bicak, Laddie J.

1990-01-01

380

Our Cosmic Connection  

ERIC Educational Resources Information Center

To help students understand the connection that Earth and the solar system have with the cosmic cycles of stellar evolution, and to give students an appreciation of the beauty and elegance of celestial phenomena, the Chandra X-Ray Center (CXC) educational website contains a stellar evolution module that is available free to teachers. In this…

Young, Donna L.

2005-01-01

381

Community Connection Curriculum.  

ERIC Educational Resources Information Center

This curriculum packet contains two teacher-developed lesson plans, for use in the upper elementary grades, which focus on urban life. The first lesson plan, "Connecting Downtown" (Michael Gray), studies how engineering and design can make cities more efficient places. It provides a brief discussion on how people travel within large urban cores,…

Center for Understanding the Built Environment, Prairie Village, KS.

382

Connections that Count  

ERIC Educational Resources Information Center

What can parents and educators of gifted children do to help them build the connections that will allow them to thrive? In this article, the author suggests a few practical and simple things that parents and educators of gifted children might want to consider as they live and work with them day by day. He breaks those suggestions out into two…

Lloyd-Zannini, Lou

2012-01-01

383

Concept Development Studies in Chemistry  

NSDL National Science Digital Library

Concept Development Studies in Chemistry is an on-line textbook for a general chemistry course. Each module develops a central concept in chemistry from experimental observations and inductive reasoning. This approach complements an interactive or active learning teaching approach. The 17 chapters are associated with the general chemistry course taught by the author at Rice University. The author holds a creative commons copyright. Users should see the text home page for details.

384

Justine P. Roth Associate Professor of Chemistry  

E-print Network

1 Justine P. Roth Associate Professor of Chemistry The Johns Hopkins University, 3400 N Ph. D. Chemistry, University of Washington, Seattle 19901994 B.S. Chemistry, University of Chemistry, Johns Hopkins University 2007present Interdepartmental Program for Molecular Biophysics

Roth, Justine P.

385

MAC 560 --Tropospheric Chemistry I Spring, 2009  

E-print Network

chemistry · to learn the atmospheric chemistry behind well-known phenomena such as smog, acid rain.3. Sulfur chemistry and acid rain 5.4. Nitrogen chemistry 5.5. Organic acids 5.6. Ecological and structural

Miami, University of

386

Chemistry Department Colloquium: Spring, 2012  

E-print Network

Chemistry Department Colloquium: Spring, 2012 Friday, March 16; 3:30 Seminar Hall (room 1315 Chemistry) Lost in Translation: How Regulators Use Science and How Scientists Can Help Bridge Gaps Stephanie to combine her Chemistry background with a legal education to improve the use of science in environmental

Sheridan, Jennifer

387

Quantum Chemistry & Spectroscopy Spring 2013  

E-print Network

-up" discipline, in which we posit that what happens at the molecular level dictates macroscopic properties://gate.acs.utah.edu) Textbook: Physical Chemistry: A Molecular Approach (McQuarrie & Simon) $75-85 Note: This text includes) Principles of Quantum Mechanics (Shankar) Physical Chemistry (Atkins) Objectives: Chemistry is a "bottom

Simons, Jack

388

Teaching Assistants Department of Chemistry  

E-print Network

Guide for Teaching Assistants Department of Chemistry The University of Chicago #12;© 2012 to familiarize you with your teaching responsibilities for General Chemistry and Organic Chemistry and to provide will also be valuable to experienced Teaching Assistants, as it provides a summary of the important policies

He, Chuan

389

Chemistry 200, 300 Interim Guide.  

ERIC Educational Resources Information Center

This guide, developed for the chemistry 200, 300 program in Manitoba, is designed to articulate with previous science courses, provide concepts, processes, and skills which will enable students to continue in chemistry-related areas, and relate chemistry to practical applications in everyday life. It includes a program overview (with program goals…

Manitoba Dept. of Education, Winnipeg.

390

The Chemistry of Failure Analysis  

Microsoft Academic Search

This paper discusses the chemistry of failure analysis in sufficient detail to serve as a practical guide for the failure analyst. It includes a discussion of the chemistry of plastic composition formulation. This discussion is preparatory to the main body of the paper which covers the chemistry and mechanics of decapsulation and, also, an explanation of the principles of chemical

Mike Jacques

1979-01-01

391

The Royal Society of Chemistry and the delivery of chemistry data repositories for the community.  

PubMed

Since 2009 the Royal Society of Chemistry (RSC) has been delivering access to chemistry data and cheminformatics tools via the ChemSpider database and has garnered a significant community following in terms of usage and contribution to the platform. ChemSpider has focused only on those chemical entities that can be represented as molecular connection tables or, to be more specific, the ability to generate an InChI from the input structure. As a structure centric hub ChemSpider is built around the molecular structure with other data and links being associated with this structure. As a result the platform has been limited in terms of the types of data that can be managed, and the flexibility of its searches, and it is constrained by the data model. New technologies and approaches, specifically taking into account a shift from relational to NoSQL databases, and the growing importance of the semantic web, has motivated RSC to rearchitect and create a more generic data repository utilizing these new technologies. This article will provide an overview of our activities in delivering data sharing platforms for the chemistry community including the development of the new data repository expanding into more extensive domains of chemistry data. PMID:25086851

Williams, Antony; Tkachenko, Valery

2014-10-01

392

The Big Picture; A Classroom Activity for Organic Chemistry  

NSDL National Science Digital Library

In the article "The Big Picture: A Classroom Activity for Organic Chemistry", Thomas Poon makes interesting use of the device exploited by Istvan Banyai in his Zoom books to help students of organic chemistry make connections between the molecular world and ways in which those molecules are important in daily life. The paper should have appeal at all levels of science education from the time the idea of molecules is first introduced through college-level courses. Along the way, students will encounter important biological molecules (such as chlorophyll), inks (such as pen ink), CFCs, hydrocarbon fuels, plastics (such as Lexan polycarbonate), and molecules with medical applications (such as aspirin and novocaine).

393

Evolution of shear zones in granular materials  

E-print Network

The evolution of wide shear zones (or shear bands) was investigated experimentally and numerically for quasistatic dry granular flows in split bottom shear cells. We compare the behavior of materials consisting of beads, irregular grains (e.g. sand) and elongated particles. Shearing an initially random sample, the zone width was found to significantly decrease in the first stage of the process. The characteristic shear strain associated with this decrease is about unity and it is systematically increasing with shape anisotropy, i.e. when the grain shape changes from spherical to irregular (e.g. sand) and becomes elongated (pegs). The strongly decreasing tendency of the zone width is followed by a slight increase which is more pronounced for rod like particles than for grains with smaller shape anisotropy (beads or irregular particles). The evolution of the zone width is connected to shear induced density change and for nonspherical particles it also involves grain reorientation effects. The final zone width is significantly smaller for irregular grains than for spherical beads.

Balazs Szabo; Janos Torok; Ellak Somfai; Sandra Wegner; Ralf Stannarius; Axel Bose; Georg Rose; Frank Angenstein; Tamas Borzsonyi

2014-07-18

394

Evolution of shear zones in granular materials  

NASA Astrophysics Data System (ADS)

The evolution of wide shear zones or shear bands was investigated experimentally and numerically for quasistatic dry granular flows in split bottom shear cells. We compare the behavior of materials consisting of beads, irregular grains, such as sand, and elongated particles. Shearing an initially random sample, the zone width was found to significantly decrease in the first stage of the process. The characteristic shear strain associated with this decrease is about unity and it is systematically increasing with shape anisotropy, i.e., when the grain shape changes from spherical to irregular (e.g., sand) and becomes elongated (pegs). The strongly decreasing tendency of the zone width is followed by a slight increase which is more pronounced for rodlike particles than for grains with smaller shape anisotropy (beads or irregular particles). The evolution of the zone width is connected to shear-induced packing density change and for nonspherical particles it also involves grain reorientation effects. The final zone width is significantly smaller for irregular grains than for spherical beads.

Szabó, Balázs; Török, János; Somfai, Ellák; Wegner, Sandra; Stannarius, Ralf; Böse, Axel; Rose, Georg; Angenstein, Frank; Börzsönyi, Tamás

2014-09-01

395

Towards "Bildung"-Oriented Chemistry Education  

ERIC Educational Resources Information Center

This paper concerns "Bildung"-oriented chemistry education, based on a reflective and critical discourse of chemistry. It is contrasted with the dominant type of chemistry education, based on the mainstream discourse of chemistry. "Bildung"-oriented chemistry education includes not only content knowledge in chemistry, but also…

Sjöström, Jesper

2013-01-01

396

33 CFR 334.330 - Atlantic Ocean and connecting waters in vicinity of Myrtle Island, Va.; Air Force practice...  

Code of Federal Regulations, 2011 CFR

...2011-07-01 2011-07-01 false Atlantic Ocean and connecting waters in vicinity...AREA REGULATIONS § 334.330 Atlantic Ocean and connecting waters in vicinity...danger zone. The waters of the Atlantic Ocean and connecting waters within an area described as...

2011-07-01

397

33 CFR 334.330 - Atlantic Ocean and connecting waters in vicinity of Myrtle Island, Va.; Air Force practice...  

Code of Federal Regulations, 2012 CFR

...2012-07-01 2012-07-01 false Atlantic Ocean and connecting waters in vicinity...AREA REGULATIONS § 334.330 Atlantic Ocean and connecting waters in vicinity...danger zone. The waters of the Atlantic Ocean and connecting waters within an area described as...

2012-07-01

398

33 CFR 334.330 - Atlantic Ocean and connecting waters in vicinity of Myrtle Island, Va.; Air Force practice...  

Code of Federal Regulations, 2010 CFR

...2010-07-01 2010-07-01 false Atlantic Ocean and connecting waters in vicinity...AREA REGULATIONS § 334.330 Atlantic Ocean and connecting waters in vicinity...danger zone. The waters of the Atlantic Ocean and connecting waters within an area described as...

2010-07-01

399

33 CFR 334.330 - Atlantic Ocean and connecting waters in vicinity of Myrtle Island, Va.; Air Force practice...  

Code of Federal Regulations, 2013 CFR

...2013-07-01 2013-07-01 false Atlantic Ocean and connecting waters in vicinity...AREA REGULATIONS § 334.330 Atlantic Ocean and connecting waters in vicinity...danger zone. The waters of the Atlantic Ocean and connecting waters within an area described as...

2013-07-01

400

Vadose Zone Journal  

NSDL National Science Digital Library

The Vadose Zone Journal is a new publication published by the Soil Science Society of America. The journal is described as "an outlet for interdisciplinary research and assessment of the vadose zone, the mostly unsaturated zone between the soil surface and the permanent groundwater table." A free online trial is currently available to review full text articles until December 31st of 2002. Although the trial includes only the first two issues, the opportunity to search and browse through the publications without charge should be taken advantage of.

2002-01-01

401

Vadose Zone Journal  

NSDL National Science Digital Library

The Vadose Zone Journal is a new publication published by the Soil Science Society of America. The journal is described as "an outlet for interdisciplinary research and assessment of the vadose zone, the mostly unsaturated zone between the soil surface and the permanent groundwater table." A free online trial is currently available to review full text articles until December 31st of 2002. Although the trial includes only the first two issues, the opportunity to search and browse through the publications without charge should be taken advantage of.

Hopmans, J. W. (Jan W.)

2007-07-07

402

Population Connection: Population Education  

NSDL National Science Digital Library

Population Connection "is the national grassroots population organization that educates young people and advocates progressive action to stabilize world population at a level that can be sustained by Earth's resources." The Population Connection's Education Program develops "age-appropriate curricula to complement students' science and social science instruction about human population trends and their impacts on natural resources, environmental quality and human well-being." The Population Education website offers a variety of educational resources including downloadable classroom activities and readings, and newsletters for teachers and students. The site also provides information about professional development opportunities for educators and free population education workshops held at universities for pre-service teachers and graduate students.

403

Time Zones as a Source of Comparative Advantage  

Microsoft Academic Search

AbstractThis note proposes a three-country model of monopolistic competition that captures the role of time zones in the division of labor. The connectivity of business service sectors via communications networks (e.g. the Internet, satellite communications systems) is found to determine the structure of comparative advantage. That is, two countries with connected service sectors have a comparative advantage in the good

Toru Kikuchi

2009-01-01

404

Limited connected speech experiment  

NASA Astrophysics Data System (ADS)

The purpose of this contract was to demonstrate that connected Speech Recognition (CSR) can be performed in real-time on a vocabulary of one hundred words and to test the performance of the CSR system for twenty-five male and twenty-five female speakers. This report describes the contractor's real-time laboratory CSR system, the data base and training software developed in accordance with the contract, and the results of the performance tests.

Landell, P. B.

1983-03-01

405

Cutter Connectivity Bandwidth Study  

NASA Astrophysics Data System (ADS)

The goal of this study was to determine how much bandwidth is required for cutters to meet emerging data transfer requirements. The Cutter Connectivity Business Solutions Team with guidance front the Commandant's 5 Innovation Council sponsored this study. Today, many Coast Guard administrative and business functions are being conducted via electronic means. Although our larger cutters can establish part-time connectivity using commercial satellite communications (SATCOM) while underway, there are numerous complaints regarding poor application performance. Additionally, smaller cutters do not have any standard means of underway connectivity. The R&D study shows the most important factor affecting web performance and enterprise applications onboard cutters was latency. Latency describes the time it takes the signal to reach the satellite and come back down through space. The latency due to use of higher orbit satellites is causing poor application performance and inefficient use of expensive SATCOM links. To improve performance, the CC must, (1) reduce latency by using alternate communications links such as low-earth orbit satellites, (2) tailor applications to the SATCOM link and/or (3) optimize protocols used for data communication to minimize time required by present applications to establish communications between the user and the host systems.

2002-10-01

406

Connection in therapeutic communities.  

PubMed

The success of therapeutic community treatment is based on trust. Trust underlies the willingness of residents to endorse and profit from confrontations of their denial. Lack of trust can be seen to underlie the high dropout rate of many therapeutic communities. Social learning theory, which is usually cited as a theoretical foundation for therapeutic communities, does not explain the role of trust. Instead, we need an explanation of trust based on a logic of emotion rather than the cognitive, calculating logic of social learning. This logic can be found in the process of connection. Trust, in the theoretical orientation of connection, grows out of the resident's perception that community members care. This caring is revealed in their empathy for the resident, their willingness to take responsibility for helping the resident, and their nurturance. The resident's level of trust determines his (her) willingness to be open and responsive to the community. The implications of the connection process for the development of trust between new residents and old residents and between residents and staff are developed. PMID:8188445

Bell, D C

1994-03-01

407

Growth controls connect  

PubMed Central

Among other signals, cell growth is particularly controlled by the target of rapamycin (TOR) pathway that includes the tuberous sclerosis complex genes (TSC1/2), and through transcriptional effects regulated by c-myc. Overexpression of Drosophila Myc and TSC1/2 cause opposing growth and proliferation defects. Despite this relationship, direct regulatory connections between Myc and the TSC have only recently been evaluated. Other than studies of p53 regulation, little consideration has been given to transcriptional regulation of the TSC genes. Here we review evidence that transcriptional controls are potentially important regulators of TSC2 expression, and that Myc is a direct repressor of its expression. Since tuberin loss de-represses Myc protein, the connection between these two growth regulators is positioned to act as a feed-forward loop that would amplify the oncogenic effects of decreased tuberin or increased Myc. Further experiments will be needed to clarify the mechanisms underlying this important connection, and evaluate its overall contribution to cancers caused by TSC loss or Myc gain. PMID:19342893

Schmidt, Emmett V.; Ravitz, Michael J.; Chen, Li; Lynch, Mary

2010-01-01

408

Connective tissue ulcers.  

PubMed

Connective tissue disorders (CTD), which are often also termed collagen vascular diseases, include a number of related inflammatory conditions. Some of these diseases include rheumatoid arthritis, systemic lupus erythematosus, systemic sclerosis (scleroderma), localized scleroderma (morphea variants localized to the skin), Sjogren's syndrome, dermatomyositis, polymyositis, and mixed connective tissue disease. In addition to the systemic manifestations of these diseases, there are a number of cutaneous features that make these conditions recognizable on physical exam. Lower extremity ulcers and digital ulcers are an infrequent but disabling complication of long-standing connective tissue disease. The exact frequency with which these ulcers occur is not known, and the cause of the ulcerations is often multifactorial. Moreover, a challenging component of CTD ulcerations is that there are still no established guidelines for their diagnosis and treatment. The morbidity associated with these ulcerations and their underlying conditions is very substantial. Indeed, these less common but intractable ulcers represent a major medical and economic problem for patients, physicians and nurses, and even well organized multidisciplinary wound healing centers. PMID:23756459

Dabiri, Ganary; Falanga, Vincent

2013-11-01

409

Connective Tissue Ulcers  

PubMed Central

Connective tissue disorders (CTD), which are often also termed collagen vascular diseases, include a number of related inflammatory conditions. Some of these diseases include rheumatoid arthritis, systemic lupus erythematosus, systemic sclerosis (scleroderma), localized scleroderma (morphea variants localized to the skin), Sjogren’s syndrome, dermatomyositis, polymyositis, and mixed connective tissue disease. In addition to the systemic manifestations of these diseases, there are a number of cutaneous features that make these conditions recognizable on physical exam. Lower extremity ulcers and digital ulcers are an infrequent but disabling complication of long-standing connective tissue disease. The exact frequency with which these ulcers occur is not known, and the cause of the ulcerations is often multifactorial. Moreover, a challenging component of CTD ulcerations is that there are still no established guidelines for their diagnosis and treatment. The morbidity associated with these ulcerations and their underlying conditions is very substantial. Indeed, these less common but intractable ulcers represent a major medical and economic problem for patients, physicians and nurses, and even well organized multidisciplinary wound healing centers. PMID:23756459

Dabiri, Ganary; Falanga, Vincent

2013-01-01

410

Promoting Scientific Literacy Using a Sociocritical and Problem-Oriented Approach to Chemistry Teaching: Concept, Examples, Experiences  

ERIC Educational Resources Information Center

This paper revisits the discussion about the objectives of scientific literacy-oriented chemistry teaching, its connection to the German concept of "Allgemeinbildung", and the debate of "science through education" vs. "education through science". About 10 years ago the sociocritical and problem-oriented approach to chemistry teaching was suggested…

Marks, Ralf; Eilks, Ingo

2009-01-01

411

EPA Map of Radon Zones  

MedlinePLUS

... Radon Zones assigns each of the 3,141 counties in the U.S. to one of three zones based on radon potential. What do the colors mean? Zone 1 counties have a predicted average indoor radon screening level ...

412

Heterogeneous atmospheric chemistry  

NASA Technical Reports Server (NTRS)

The present conference on heterogeneous atmospheric chemistry considers such topics concerning clusters, particles and microparticles as common problems in nucleation and growth, chemical kinetics, and catalysis, chemical reactions with aerosols, electron beam studies of natural and anthropogenic microparticles, and structural studies employing molecular beam techniques, as well as such gas-solid interaction topics as photoassisted reactions, catalyzed photolysis, and heterogeneous catalysis. Also discussed are sulfur dioxide absorption, oxidation, and oxidation inhibition in falling drops, sulfur dioxide/water equilibria, the evidence for heterogeneous catalysis in the atmosphere, the importance of heterogeneous processes to tropospheric chemistry, soot-catalyzed atmospheric reactions, and the concentrations and mechanisms of formation of sulfate in the atmospheric boundary layer.

Schryer, D. R.

1982-01-01

413

Medicinal chemistry for 2020.  

PubMed

Rapid advances in our collective understanding of biomolecular structure and, in concert, of biochemical systems, coupled with developments in computational methods, have massively impacted the field of medicinal chemistry over the past two decades, with even greater changes appearing on the horizon. In this perspective, we endeavor to profile some of the most prominent determinants of change and speculate as to further evolution that may consequently occur during the next decade. The five main angles to be addressed are: protein-protein interactions; peptides and peptidomimetics; molecular diversity and pharmacological space; molecular pharmacodynamics (significance, potential and challenges); and early-stage clinical efficacy and safety. We then consider, in light of these, the future of medicinal chemistry and the educational preparation that will be required for future medicinal chemists. PMID:22004084

Satyanarayanajois, Seetharama D; Hill, Ronald A

2011-10-01

414

Pure and Applied Chemistry  

NSDL National Science Digital Library

Established in 1960, the journal Pure and Applied Chemistry is committed to publishing notable research papers arising from various international scientific events and projects that are sponsored by the International Union of Pure and Applied Chemistry (IUPAC). First-time visitors can view the "News" area to learn about the most recent work published in the journal, and then they may wish to move on to the embedded search engine displayed prominently on the homepage. Other sections on the site include "Editorial Board", "Notes For Authors", and "Publication Policy". Visitors with a deep and abiding interest in the journal may also wish to consult their RSS feeds, which include those related to the publication of new articles and reports from the IUPAC. Finally, the site also contains a drop down menu titled "PAC Archives" where visitors can browse the contents of each volume.

415

Medicinal chemistry for 2020  

PubMed Central

Rapid advances in our collective understanding of biomolecular structure and, in concert, of biochemical systems, coupled with developments in computational methods, have massively impacted the field of medicinal chemistry over the past two decades, with even greater changes appearing on the horizon. In this perspective, we endeavor to profile some of the most prominent determinants of change and speculate as to further evolution that may consequently occur during the next decade. The five main angles to be addressed are: protein–protein interactions; peptides and peptidomimetics; molecular diversity and pharmacological space; molecular pharmacodynamics (significance, potential and challenges); and early-stage clinical efficacy and safety. We then consider, in light of these, the future of medicinal chemistry and the educational preparation that will be required for future medicinal chemists. PMID:22004084

Satyanarayanajois, Seetharama D; Hill, Ronald A

2011-01-01

416

The World of Chemistry  

NSDL National Science Digital Library

One doesn't have to be a Glenn Seaborg or a Lord Ernest Rutherford to learn about chemistry, though it probably couldn't help to have some of their curiosity about the world of chemistry. Young chemists and their teachers will definitely benefit from this nice resource offered by the Annenberg Media project. This original video series was produced by the University of Maryland and the Educational Film Center, and it consists of 26 half-hour programs. With industrial and research chemists demonstrating a number of high-intensity experiments and processes, the series is quite a find. The installments include such titles as "Modeling the Unseen", "The Atom", and "The Busy Electron".

1990-01-01

417

Chemistry: A Molecular Approach  

NSDL National Science Digital Library

If you're away from the laboratory and you'd like to study a bit of chemistry, this fine site is a nice option. Created to complement a recent chemistry textbook authored by Nivaldo Tro of Westmont College, the site includes interactive media activities, self-quizzes, and a collection of external links. The materials are linked to the 24 chapters in the textbook, and they include "Gases", "Solutions", and "Electrochemistry". Each of these virtual chapters includes a listing of key concepts, along with slides, a set of useful tools (such as the periodic table), and a short video demonstrating different principles and concepts. Additionally, visitors can use the embedded search engine to look for specific items of interest and so on.

Tro, Nivaldo J.

418

Storylines in intercalation chemistry.  

PubMed

Intercalation chemistry will soon be a hundred years old. The period of greatest activity in this field of solid state chemistry and physics was from about 1970 to 1990. The intercalation reactions are defined as topotactic solid state reactions and the products--the intercalation compounds--are clearly distinguished from inclusion and interstitial compounds. After a short historical introduction emphasizing the pioneering work of Ulrich Hofmann, the central topics and concepts will be reviewed and commented on. The most important ones, in my view, are: dichalcogenide intercalation compounds, the electrochemical intercalation and the search for new battery electrodes, the physics of graphite intercalation compounds, and the staging and interstratification phenomena. The relation to other fields of actual research and the demands for forthcoming research will also be addressed. PMID:24915040

Lerf, A

2014-07-21

419

A Thematic Review of Studies into the Effectiveness of Context-Based Chemistry Curricula  

NASA Astrophysics Data System (ADS)

Context-based chemistry education aims at making connections between real life and the scientific content of chemistry courses. The purpose of this study was to evaluate context-based chemistry studies. In looking for the context-based chemistry studies, the authors entered the keywords `context-based', `contextual learning' and `chemistry education' in well-known databases (i.e. Academic Search Complete, Education Research Complete, ERIC, Springer LINK Contemporary). Further, in case the computer search by key words may have missed a rather substantial part of the important literature in the area, the authors also conducted a hand search of the related journals. To present a detailed thematic review of context-based chemistry studies, a matrix was used to summarize the findings by focusing on insights derived from the related studies. The matrix incorporates the following themes: needs, aims, methodologies, general knowledge claims, and implications for teaching and learning, implications for curriculum development and suggestions for future research. The general knowledge claims investigated in this paper were: (a) positive effects of the context-based chemistry studies; (b) caveats, both are examined in terms of students' attitudes and students' understanding/cognition. Implications were investigated for practice in context- based chemistry studies, for future research in context- based chemistry studies, and for curriculum developers in context- based chemistry studies. Teachers of context-based courses claimed that the application of the context-based learning approach in chemistry education improved students' motivation and interest in the subject. This seems to have generated an increase in the number of the students who wish to continue chemistry education at higher levels. However, despite the fact that the majority of the studies have reported advantages of context-based chemistry studies, some of them have also referred to pitfalls, i.e. dominant structure of out-of-school learning, tough nature of some chemistry topics, and teacher anxiety of lower-ability students.

Ültay, Neslihan; Çal?k, Muammer

2012-12-01

420

The Chemistry of Coffee  

NSDL National Science Digital Library

The paper Our Everyday Cup of Coffee: The Chemistry behind Its Magic by Marino Petracco provides a hearty blend of molecules for this month. The author deals with coffee at a number of different levels ranging from the economic and social to the still perplexing questions of flavor and aroma. The associated molecules demonstrate a range of structural features that students will benefit from examining in three dimensions.

421

Green chemistry: development trajectory  

NASA Astrophysics Data System (ADS)

Examples of applications of green chemistry methods in heavy organic synthesis are analyzed. Compounds, which can be produced by the processing of the biomass, and the criteria for the selection of the most promising products are summarized. The current status of the ethanol production and processing is considered. The possibilities of the use of high fatty acid triglycerides, glycerol, succinic acid, and isoprene are briefly discussed. The bibliography includes 67 references.

Moiseev, I. I.

2013-07-01

422

Resources for Chemistry Educators  

NSDL National Science Digital Library

This site provides annotated Web links to instructional materials and other resources of interest to Chemistry teachers and course designers. The links are carefully selected to represent what the author considers to be the most useful and exemplary resources. Special emphasis is placed on CAI lessons, digital text, Web-based tutorials and similar materials that can serve as alternatives to traditional methods of instruction.

423

(Iodine and tellurium chemistry)  

SciTech Connect

The traveler worked with scientists from Great Britain, France, Canada, and the Federal Republic of Germany to produce a program and structure for the Second CSNI Specialists' Workshop on the Chemistry of Iodine in Reactor Safety. This workshop will be held on June 2--3, 1988, in Toronto, Canada. In addition to planning the workshop, there were informal discussions about the status of iodine research in the Federal Republic of Germany and in Canada.

Beahm, E.C.

1988-03-16

424

The Habitable Zone  

NSDL National Science Digital Library

This illustration is an approximate representation of the planets in our solar system and their relation to what scientists call The Habitable Zone. The planet distances from the sun are measured in Astronomical Units (AU) and are not to scale.

2008-03-26

425

Jovian Auroral Chemistry  

NASA Astrophysics Data System (ADS)

Recent STIS data indicate that the jovian aurora occasionally deposits an energy flux of several W/m2 into the upper atmosphere, most of which penetrates the homopause into hydrocarbon-rich layers. The energetic electrons which carry this flux are thought to initiate the formation of complex hydrocarbons and soot-like aerosols which settle into and blanket the polar stratosphere. Because of the large number of important species and reactions involved, until recently there has been little attention paid to the problem of simulating jovian auroral chemistry. We have modified the Caltech/JPL KINETICS code for general atmospheric chemistry for the investigation of jovian auroral chemistry. Building on the recent work by Perry et al. (J. Geophys. Res., 104, 16,451, 1999), Wong et al. (Astrophys. J., 534, L215, 2000), and Moses et al. (Icarus, 143, 244, 2000; J. Geophys. Res., 105, 7013, 2000), we have updated and included several hundred neutral-neutral and ion-neutral reactions to provide a basis for studying the effects of energetic electron impact on the auroral region atmosphere of Jupiter. We present here the initial results from this study, concentrating on the main ion-neutral pathways for producing complex hydrocarbons, and examining the role of the simplest aromatic compound, c-C3H3+.

Gladstone, G. R.; Majeed, T.; Moses, J. I.; Waite, J. H., Jr.; Allen, M. A.; Yung, Y. L.; Pryor, W. R.

2000-10-01

426

Chemistry of sex attraction.  

PubMed Central

The chemical communication system used to attract mates involves not only the overt chemical signals but also indirectly a great deal of chemistry in the emitter and receiver. As an example, in emitting female moths, this includes enzymes (and cofactors, mRNA, genes) of the pheromone biosynthetic pathways, hormones (and genes) involved in controlling pheromone production, receptors and second messengers for the hormones, and host plant cues that control release of the hormone. In receiving male moths, this includes the chemistry of pheromone transportation in antennal olfactory hairs (binding proteins and sensillar esterases) and the chemistry of signal transduction, which includes specific dendritic pheromone receptors and a rapid inositol triphosphate second messenger signal. A fluctuating plume structure is an integral part of the signal since the antennal receptors need intermittent stimulation to sustain upwind flight. Input from the hundreds of thousands of sensory cells is processed and integrated with other modalities in the central nervous system, but many unknown factors modulate the information before it is fed to motor neurons for behavioral responses. An unknown brain control center for pheromone perception is discussed relative to data from behavioral-threshold studies showing modulation by biogenic amines, such as octopamine and serotonin, from genetic studies on pheromone discrimination, and from behavioral and electrophysiological studies with behavioral antagonists. Images Fig. 1 PMID:7816846

Roelofs, W L

1995-01-01

427

Chemistry and cosmology.  

PubMed

The simplest elements, hydrogen and helium, offer a remarkably rich chemistry, which has controlled crucial features of the early evolution of the universe. Theoretical models of the origin of structure (stars, galaxies, clusters of galaxies, etc.) now incorporate this chemistry in some detail. In addition to the origin of structure, cosmologists are concerned with observational tests of competing world models. Primordial chemistry may give rise to some of the earliest departures from thermodynamic equilibrium in the universe. These effects may be observable as broad-band spectroscopic distortions of the cosmic background radiation, which otherwise exhibits a nearly perfect blackbody spectrum. The chemical history of the expanding universe is followed through a detailed calculation of the evolution of the abundances of H, H+, H-, H2, H2+, H3+, and other minor species. It is shown that continuous absorption by the small concentration of H- can produce a distortion in the cosmic background spectrum with a maximum at a frequency near nu/c = 9 cm-1 (wavelength 1.1 mm). The predicted effect lies only a factor of 5 below current limits. Its detection would provide an important test of our understanding of the recombination epoch of the universe. PMID:17191439

Black, John H

2006-01-01

428

Cascadia Subduction Zone  

USGS Publications Warehouse

The geometry and recurrence times of large earthquakes associated with the Cascadia Subduction Zone (CSZ) were discussed and debated at a March 28-29, 2006 Pacific Northwest workshop for the USGS National Seismic Hazard Maps. The CSZ is modeled from Cape Mendocino in California to Vancouver Island in British Columbia. We include the same geometry and weighting scheme as was used in the 2002 model (Frankel and others, 2002) based on thermal constraints (Fig. 1; Fluck and others, 1997 and a reexamination by Wang et al., 2003, Fig. 11, eastern edge of intermediate shading). This scheme includes four possibilities for the lower (eastern) limit of seismic rupture: the base of elastic zone (weight 0.1), the base of transition zone (weight 0.2), the midpoint of the transition zone (weight 0.2), and a model with a long north-south segment at 123.8? W in the southern and central portions of the CSZ, with a dogleg to the northwest in the northern portion of the zone (weight 0.5). The latter model was derived from the approximate average longitude of the contour of the 30 km depth of the CSZ as modeled by Fluck et al. (1997). A global study of the maximum depth of thrust earthquakes on subduction zones by Tichelaar and Ruff (1993) indicated maximum depths of about 40 km for most of the subduction zones studied, although the Mexican subduction zone had a maximum depth of about 25 km (R. LaForge, pers. comm., 2006). The recent inversion of GPS data by McCaffrey et al. (2007) shows a significant amount of coupling (a coupling factor of 0.2-0.3) as far east as 123.8? West in some portions of the CSZ. Both of these lines of evidence lend support to the model with a north-south segment at 123.8? W.

Frankel, Arthur D.; Petersen, Mark D.

2008-01-01

429

Saturated Zone Colloid Transport  

Microsoft Academic Search

This scientific analysis provides retardation factors for colloids transporting in the saturated zone (SZ) and the unsaturated zone (UZ). These retardation factors represent the reversible chemical and physical filtration of colloids in the SZ. The value of the colloid retardation factor, R{sub col} is dependent on several factors, such as colloid size, colloid type, and geochemical conditions (e.g., pH, Eh,

H. S. Viswanathan

2004-01-01

430

The 1-way on-line coupled atmospheric chemistry model system MECO(n) - Part 1: The limited-area atmospheric chemistry model COSMO/MESSy  

NASA Astrophysics Data System (ADS)

The numerical weather prediction model of the Consortium for Small Scale Modelling (COSMO), maintained by the German weather service (DWD), is connected with the Modular Earth Submodel System (MESSy). This effort is undertaken in preparation of a~new, limited-area atmospheric chemistry model. This model is as consistent as possible, with respect to atmospheric chemistry and related processes, with a previously developed global atmospheric chemistry general circulation model: the ECHAM/MESSy Atmospheric Chemistry (EMAC) model. The combined system constitutes a new research tool, bridging the global to the meso-? scale for atmospheric chemistry research. MESSy provides the infrastructure and includes, among others, the process and diagnostic submodels for atmospheric chemistry simulations. Furthermore, MESSy is highly flexible allowing model setups with tailor made complexity, depending on the scientific question. Here, the connection of the MESSy infrastructure to the COSMO model is documented. Previously published prototype submodels for simplified tracer studies are generalised to be plugged-in and used in the global and the limited-area model. They are used to evaluate the tracer transport characteristics of the new COSMO/MESSy model system, an important prerequisite for future atmospheric chemistry applications. A supplementary document with further details on the technical implementation of the MESSy interface into COSMO with a complete list of modifications to the COSMO code is provided.

Kerkweg, A.; Jöckel, P.

2011-06-01

431

The Connection Machine  

SciTech Connect

This book describes what history may judge to be the second stage in the evolution of digital computers. Up to now, all computers have had basically the same architecture: one or a few large memory banks. Challenging that conception, the Connection Machine links together thousands or millions of extremely small processors and memories. From each moment to the next, the programs for this singularly versatile machine can refigure its architecture to suit the natural requirements of problems to be solved. The resulting configurations have already been applied to diverse data-structures required for processes involved with artificial intelligence, cellular physics, database inference, and number crunching computation.

Hillis, W.D.

1985-01-01

432

Magnificent Ground Water Connection  

NSDL National Science Digital Library

The Magnificent Ground Water Connection is a compilation of ground water-related activities for teaching and learning purposes. The teacher's activity guide is applicable to a wide range of subject matter and the ground water theme is integrated into stories, songs, math, social studies, art and writing. The topics include basic concepts of the water cycle, water distribution, treatment and stewardship. Other subjects include the water cycle and water conservation, New England's ground water resources, ground water contamination and protection. Sections are also available for wetlands, ground water, marine debris, waster, air quality, acid rain, and energy. Users can also access an on-line lending library for educational materials and videos.

433

Heterogeneous wetland complexes, buffer zones, and travel corridors: Landscape management for freshwater  

E-print Network

Heterogeneous wetland complexes, buffer zones, and travel corridors: Landscape management: Chelodina longicollis Habitat complementation Landscape connectivity Landscape heterogeneity Migration habitats surrounding wetlands play an integral role in regulating microclimate and inputs of nutri- 0006

Canberra, University of

434

Collaborative Distance Education: The Iowa Chemistry Education Alliance  

NASA Astrophysics Data System (ADS)

The Iowa Chemistry Education Alliance is a consortium of four chemistry instructors from central Iowa high schools, several members of the Iowa State University faculty, and consultants from an Iowa Area Education Agency. The group was formed to develop a set of concept-oriented, problem-solving, multimedia curriculum modules that could be used collaboratively in a distance education environment. Students and teachers alike used Iowa's statewide two-way interactive fiber optic system, the Iowa Communications Network (ICN). The ICN connects Iowa's three public universities, community colleges, most private colleges, and most high schools. There are more than 400 classrooms connected to the ICN. This report provides an overview of how modern technology is used to engage teachers and students in collaborative distance education.

Greenbowe, Thomas J.; Burke, K. A.

1998-10-01

435

Chemistry and narrative: Short stories and school chemistry  

NASA Astrophysics Data System (ADS)

Science competitions can provide rich sources of data about students' knowledge and attitudes. The Australian National Chemistry Week's Short Story Competition generates a large number of fictional narratives that can be analysed for the authors' views of the place and relevance of chemistry in their lives, as well as providing an opportunity to integrate chemistry knowledge with their writing skills. This paper reports on the purposes of the competition, responses in terms of the short stories received and discusses some of the educational implications for the use of stories in the chemistry classroom.

Strube, Paul

1996-06-01

436

Groundwater chemistry at Yucca Mountain, Nevada, and vicinity  

SciTech Connect

The chemistry of groundwater at Yucca Mountain and vicinity has been reviewed and compared with the chemistry of water from the Nevada Test Site and surrounding areas such as the Amargosa Desert and Oasis Valley. Sodium is the primary cation and carbonate is the primary anion in water from the saturated zone of the tuffaceous aquifer at Yucca Mountain. Other major cations present are calcium, potassium, and magnesium; other major anions are sulfate and chloride, with lesser quantities of fluoride and nitrate. Aqueous silica is also present. The primary purpose of this review was to survey water-composition data and look for relations among the compositional variables that could provide insight into the processes that control the composition and would ultimately affect radionuclide transport. The following conclusions were inferred from the review. Major cation concentrations are controlled by rock dissolution and mineral precipitation reactions as well as by cation exchange with existing minerals. Aqueous carbonate initially comes from atmospheric and soil-zone carbon dioxide, but there is evidence at Yucca Mountain that carbon dioxide in the gas phase of the unsaturated zone supplies additional carbonate to saturated-zone water in the tuffaceous aquifer as mineral dissolution and precipitation reactions raise the pH of the water. This combination is effectively mineral dissolution and precipitation in a system that is open with respect to carbon dioxide. A carbon model for this process is discussed.

Kerrisk, J.F.

1987-02-01

437

Science Sampler: Making Connections Fun  

NSDL National Science Digital Library

Games are a great way to help students make meaningful connections between abstract science concepts and vocabulary. This article describes three games--Secrets, Connections, and Pairs of Opposites--that help students reinforce concepts, formulate relationships, and demonstrate comprehension.

Marturano, Arlene

2004-05-01

438

Reciprocal Inhibitory Connections and Network  

E-print Network

Reciprocal Inhibitory Connections and Network Synchrony in the Mammalian Thalamus Molly M. Huntsman in relay cells. In addition, oscillatory synchrony was dramatically intensified. Thus, recurrent inhibitory connections within reticular nucleus act as "desynchronizers." Inhibitory circuits arising in the reticular

Huguenard, John R.

439

THE POISSON RANDOM CONNECTION MODEL  

E-print Network

process. Each pair of points has some probability of being connected by a line. The probability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.2 Poisson process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 2THE POISSON RANDOM CONNECTION MODEL: CONSTRUCTION, CENTRAL LIMIT THEOREM AND ASYMPTOTIC

440

Supergranulation Scale Connection Simulations  

E-print Network

Results of realistic simulations of solar surface convection on the scale of supergranules (96 Mm wide by 20 Mm deep) are presented. The simulations cover only 10% of the geometric depth of the solar convection zone, but half its pressure scale heights. They include the hydrogen, first and most of the second helium ionization zones. The horizontal velocity spectrum is a power law and the horizontal size of the dominant convective cells increases with increasing depth. Convection is driven by buoyancy work which is largest close to the surface, but significant over the entire domain. Close to the surface buoyancy driving is balanced by the divergence of the kinetic energy flux, but deeper down it is balanced by dissipation. The damping length of the turbulent kinetic energy is 4 pressure scale heights. The mass mixing length is 1.8 scale heights. Two thirds of the area is upflowing fluid except very close to the surface. The internal (ionization) energy flux is the largest contributor to the convective flux for temperatures less than 40,000 K and the thermal energy flux is the largest contributor at higher temperatures. This data set is useful for validating local helioseismic inversion methods. Sixteen hours of data are available as four hour averages, with two hour cadence, at steinr.msu.edu/~bob/96averages, as idl save files. The variables stored are the density, temperature, sound speed, and three velocity components. In addition, the three velocity components at 200 km above mean continuum optical depth unity are available at 30 sec. cadence.

R. F. Stein; A. Nordlund; D. Georgobiani; D. Benson; W. Schaffenberger

2008-11-04

441

Problems of space chemistry  

NASA Astrophysics Data System (ADS)

The main problems of space chemistry are examined, including the origin and abundance of chemical elements, their migration to different regions of the universe, the formation of the chemical composition of cosmic bodies, and the chemical evolution of the solar system and the origin of life. Based on current astrophysical and space-chemical data, the main stages of the evolution of matter from the beginning of universe expansion to the formation of the solar system are described. The problem of the origin of life is examined in the light of space-chemical data on the formation of high-molecular compounds before the formation of the planets.

Voitkevich, Georgii V.

442

Black Hole Chemistry  

E-print Network

The mass of a black hole has traditionally been identified with its energy. We describe a new perspective on black hole thermodynamics, one that identifies the mass of a black hole with chemical enthalpy, and the cosmological constant as thermodynamic pressure. This leads to an understanding of black holes from the viewpoint of chemistry, in terms of concepts such as Van der Waals fluids, reentrant phase transitions, and triple points. Both charged and rotating black holes exhibit novel chemical-type phase behaviour, hitherto unseen.

David Kubiznak; Robert B. Mann

2014-04-08

443

Black Hole Chemistry  

E-print Network

The mass of a black hole has traditionally been identified with its energy. We describe a new perspective on black hole thermodynamics, one that identifies the mass of a black hole with chemical enthalpy, and the cosmological constant as thermodynamic pressure. This leads to an understanding of black holes from the viewpoint of chemistry, in terms of concepts such as Van der Waals fluids, reentrant phase transitions, and triple points. Both charged and rotating black holes exhibit novel chemical-type phase behaviour, hitherto unseen.

Kubiznak, David

2014-01-01

444

Chemistry and Science Fiction  

NASA Astrophysics Data System (ADS)

This lively collection looks at science as filtered through literature, film, and television. It discusses classic works in science fiction and provides an in-depth look at the chemistry depicted in popular culture, particularly in Start Trek , Star Wars , and Doctor Who . It includes an examination by Nebula Award winner Connie Willis of how science fiction authors use science, and reprints two tongue-in-cheek short stories by Isaac Asimov. The book also includes suggestions for using science fiction as an educational resource.

Stocker, Jack H.

1998-11-01

445

The Virtual Chemistry Laboratory  

NSDL National Science Digital Library

This networked laboratory simulation provides an environment in which students can select from hundreds of standard chemical reagants and combine them in any way they see fit. Instructors may use this environment in a variety of settings including student homework, group projects, computer lab activities and pre- and post-lab exercises to support varied approaches to chemical education. Activities are stored in our online homework repository which currently includes: acids and bases, chemical equilibrium, molarity, redox chemistry, solubility, stoichiometry, thermochemistry, and quantitative analysis.

Yaron, David

1999-01-01

446

Extended Wordsearches in Chemistry  

NASA Astrophysics Data System (ADS)

Students can be encouraged to develop their factual knowledge by use of puzzles. One strategy described here is the extended wordsearch, where the wordsearch element generates a number of words or phrases from which the answers to a series of questions are selected. The wordsearch can be generated with the aid of computer programs, though in order to make them suitable for students with dyslexia or other learning difficulties, a simpler form is more appropriate. These problems can be employed in a variety of contexts, for example, as topic tests and classroom end-of-lesson fillers. An example is provided in the area of calcium chemistry. Sources of suitable software are listed.

Cotton, Simon

1998-04-01

447

Interstellar deuterium chemistry  

Microsoft Academic Search

Possible improvements of gas-phase chemical models regarding processes in interstellar space are considered. It is pointed out that previous studies have not included deuterium in their reaction schemes. A consideration of deuterium is important in connection with the establishment of the cosmic deuterium abundance as an important indicator of the nature of the universe. Other deficiencies in current models are

R. D. Brown; E. Rice; J. Brooks

1981-01-01

448

Korean Kimchi Chemistry  

NSDL National Science Digital Library

Connecting science with different cultures is one way to interest students in science, to relate science to their lives, and at the same time to broaden their horizons in a variety of ways. In the lesson described here, students make kimchi, a delicious a

Murfin, Brian

2009-10-01

449

Green chemistry: principles and practice.  

PubMed

Green Chemistry is a relatively new emerging field that strives to work at the molecular level to achieve sustainability. The field has received widespread interest in the past decade due to its ability to harness chemical innovation to meet environmental and economic goals simultaneously. Green Chemistry has a framework of a cohesive set of Twelve Principles, which have been systematically surveyed in this critical review. This article covers the concepts of design and the scientific philosophy of Green Chemistry with a set of illustrative examples. Future trends in Green Chemistry are discussed with the challenge of using the Principles as a cohesive design system (93 references). PMID:20023854

Anastas, Paul; Eghbali, Nicolas

2010-01-01

450

Graduate Education in Environmental Chemistry  

ERIC Educational Resources Information Center

Describes the role chemistry departments should assume in the environmental quality control area. Includes problems of program design, course offerings, research problems, and career qualifications. (GS)

Lee, G. Fred

1974-01-01

451

The Canadian Society for Chemistry  

NSDL National Science Digital Library

"The Canadian Society for Chemistry (CSC) is the national technical association representing the field of chemistry and the interests of chemists in industry, academia and government." The website contains recent media releases about chemistry activities and news updates in Canada. Primary and secondary school educators can find chemical experiments and trivia questions for their students. Researchers can learn about the 87th Conference of the Canadian Society for Chemistry being held May 29 through June 1, 2004. At the website, interested chemists can find membership information.

452

Response of near-stream surface connectivity to water table dynamics during rainfall events at a small headwater catchment (Luxembourg)  

NASA Astrophysics Data System (ADS)

The controls on non-linear streamflow response to changing streamflow sources during precipitation events are poorly understood. Here, we investigate the linkages between surface saturation development and streamflow under a range of wetness conditions for a forested headwater catchment in Luxembourg. Previous work at this site shows a threshold response in stream discharge to changes in soil moisture. This non-linearity is thought to reflect the development of saturation connectivity that drives streamflow response. Furthermore, the catchment has typically large rainfall-runoff ratios during winter, accompanied by long delays to peak after the onset of rainfall. To better understand controls on these behaviors, we examined the response of near-stream surface saturation development to incident precipitation, discharge, and fluctuating groundwater levels during rain events. Specifically, we sought to test the hypothesis that threshold-like response behavior exists between near-stream surface saturation and discharge, as well as quantify changes in surface saturated zone chemistry to better understand mixing between end-member sources during events. We used ground-based thermal infrared imagery to measure surface saturation development in a 4 by 6 m zone in the riparian area. Imagery collected over several months was analyzed to calculate the proportion of saturated area. Water samples from this saturated riparian area, nearby piezometers as well as discharge were collected for analysis of water isotopes, major cations/anions, and silica concentrations. Data analysis is ongoing but preliminary results indicate that saturation extent exhibits a non-linear, threshold-like response to discharge and antecedent wetness conditions. Surface saturation showed strong hysteresis with near-stream groundwater levels, with saturated areas expanding ahead of increasing groundwater levels. As the proportion of saturated area increased during rainfall events, the saturated riparian are and stream isotope signals became more and more depleted, shifting toward groundwater isotope concentrations during events. Stream conductivity, silica, and chloride concentrations also decreased as the proportion of saturated area increased. This suggests that surface saturation during the hydrograph rise is sourced by rainfall and near-surface sources while under high flow conditions it is dominated by exfiltrating groundwater. The threshold-like response of surface saturation and observed chemistry dynamics suggest that the near-stream saturated zone acts as a collection of many small reservoirs, filling and spilling to contribute to streamflow as a single united source—a size and volume which varies according to event size and antecedent conditions.

Frentress, Jay; Martínez-Carreras, Núria; Pfister, Laurent; McDonnell, Jeff

2014-05-01

453

Java Developer Connection  

NSDL National Science Digital Library

The Java Developer Connection (JDC), provided by Sun Microsystems, is loaded with helpful information about the Java programming language. Registration is required to access the JDC, but it is free. The site includes a searchable Technical Support section, Online Training, access to the newest Java technology, bug reports, Discussion Forums, and JDC emails. The discussion forums are setup in an interesting way: each member is given "DukeDollars" which they can use to lure other members to answer their questions. The JDC emails are made of the JDC Newsletters and the JDC Tech Tips, an email sent out about once a week that includes java programming tips, techniques, and even sample code. Don't worry if you missed some of the previous Tech Tips because they are all archived. The JDC is an easy-to-use, extensive resource for java developers.

1998-01-01

454

Education Scotland: Connected  

NSDL National Science Digital Library

Connected is an online magazine published by Education Scotland, formerly Learning and Teaching Scotland, "a national public body which provides guidance and support for teachers, school managers, local authorities, parents and others involved in education in Scotland." The articles featured here focus on ways to use information and communications technology (ICT) in learning, teaching and community development. The current issue is on 'New Teachers and ICT', and includes articles written by new and student teachers, reports from faculties of education, tips and links to useful websites. Some examples of topics addressed include using digital images in education, teaching with an interactive whiteboard, enhancing music with ICT and using an electronic voting system with parents. Teachers (and those from Scotland, in particular) are invited to comment on the articles by emailing the organization.

455

Editorial: Au Courant Connections  

NSDL National Science Digital Library

In an effort to connect with college-level science instructors "beyond the classroom walls," the editor plans to start a blog. Blogs are the electronic equivalent of an open conversation at a relaxed conference. You get there through an internet site, and watch what's going on. Because it's a place for an ongoing discussion, you can chime in at any time just by typing a casual sentence. Entries by everyone are usually brief, frequently direct, and don't require more than a modicum of energy to overcome the natural inertia or shyness we all experience. So fire up your browser, copy this address into the appropriate spot--http://blogs.nsta.org/JCSTBlog, and hit "enter." We're all waiting!

Cutler, Ann

2009-03-01

456

Connect With English  

NSDL National Science Digital Library

There are many ways to learn another language and Connect with English offers an innovative approach. Through the story of Rebecca Casey, a young woman Bostonian, this multi-part soap opera from the Annenberg Learner site was originally produced by WGBH and it is designed to help non-native speakers learn English. It's a dynamic 48-part series that features family struggles, personal ambition, and a cross-country adventure. Visitors can watch each episode at their leisure all the while practicing English through a range of activities. The site also features a Resources area that offers a variety of websites for learning and practicing English, including complementary items from the BBC, Voice of America, and the New York Times. It's a great resource for ESL teachers and anyone else with an interest in language acquisition.

457

Connecting the Dots [pdf  

NSDL National Science Digital Library

The Demos thinktank organization is based in London, and they never shy away from the tough topics. This 108-page paper released in November 2009 is titled "Connecting the Dots" and was written by Demos staff members Jake Chapman, Charlie Edwards, and Simon Hampson. This paper "offers an approach premised on learning and adaptation, which demands that politicians and policymakers be prepared to embrace uncertainty and complexity." It does this by taking a close look at three very complex and intractable policy issues: illicit drugs in Mexico, London gang crime, and climate change. The report includes five separate chapters, along with a section of references. For anyone looking for a compelling voice in the wide world of public policy and related matters, this paper is an excellent find.

Chapman, Jake; Edwards, Charlie; Hampson, Simon

2009-01-01

458

Chemistry UMass Lowell Commonwealth Honors Track  

E-print Network

Chemistry UMass Lowell Commonwealth Honors Track Scholarship Rises. Freshman Year/ Fall Semester Cr) Honors Chemistry I 3 84.136 (H) Honors Chemistry II 3 84.123 (H) Honors Chemistry I Lab 1 84.124 (H) Honors Chemistry II Lab 1 92.131 Calculus I 4 92.132 Honors Calculus II 4 Hon 110 Honors FYSH (AH) 3 Gen

Massachusetts at Lowell, University of

459

Peer Mentoring in the General Chemistry and Organic Chemistry Laboratories. The Pinacol Rearrangement: An Exercise in NMR and IR Spectroscopy for General Chemistry and Organic Chemistry Laboratories  

Microsoft Academic Search

This article describes a discovery experiment for general chemistry and organic chemistry labs. Although the pinacol rearrangement has been employed in undergraduate organic laboratories before, in this application organic chemistry students act as mentors to students of general chemistry. Students work together using distillation---a new technique for the general chemistry students and a basic one for the organic students---to isolate

Caleb A. Arrington; Jameica B. Hill; Ramin Radfar; David M. Whisnant; Charles G. Bass

2008-01-01

460

Chemistry Major and Minor At A Glance  

E-print Network

. Major III ­ Forensic Chemistry Major IV** ­ Biochemistry Option Chemistry Minor General Chemistry I & II or senior year Five Year BS/MS in Forensic Chemistry 21 additional credits of courses in Forensic SciencesChemistry Major and Minor At A Glance Major I ­ Pre-professional (Medicine, Dentistry, Business

Schmitt, William R.

461

Study Abroad in Chemistry and Biochemistry  

E-print Network

Study Abroad in Chemistry and Biochemistry Department of Chemistry and Biochemistry York Hall for courses that may fulfill Chemistry and/or Biochemistry & other requirements to add to your Academic Planning Form Meet with your Chemistry and/or Biochemistry & college advisors Study Abroad as a Chemistry/Biochemistry

Gleeson, Joseph G.

462

Dike zones on Venus  

NASA Technical Reports Server (NTRS)

Venusian dike zone structures were identified from Venera 15 and 16 radar images. These include: a zone of subparallel rows centered at 30 deg N, 7 deg E; a system of intersecting bands centered at 67 deg N, 284 deg E; polygonal systems in lavas covering the structural base uplift centered at 47 deg N, 200 deg E; a system of light bands in the region of the ring structure centered at 43 deg N, 13 deg E; and a dike band centered at 27 deg N, 36 deg E.

Markov, M. S.; Sukhanov, A. L.

1987-01-01

463

Pansynaptic enlargement at adult cortical connections strengthened by experience.  

PubMed

Behavioral experience alters the strength of neuronal connections in adult neocortex. These changes in synaptic strength are thought to be central to experience-dependent plasticity, learning, and memory. However, it is not known how changes in synaptic transmission between neurons become persistent, thereby enabling the storage of previous experience. A long-standing hypothesis is that altered synaptic strength is maintained by structural modifications to synapses. However, the extent of synaptic modifications and the changes in neurotransmission that the modifications support remain unclear. To address these questions, we recorded from pairs of synaptically connected layer 2/3 pyramidal neurons in the barrel cortex and imaged their contacts with high-resolution confocal microscopy after altering sensory experience by whisker trimming. Excitatory connections strengthened by experience exhibited larger axonal varicosities, dendritic spines, and interposed contact zones. Electron microscopy showed that contact zone size was strongly correlated with postsynaptic density area. Therefore, our findings indicate that whole synapses are larger at strengthened connections. Synaptic transmission was both stronger and more reliable following experience-dependent synapse enlargement. Hence, sensory experience modified both presynaptic and postsynaptic function. Our findings suggest that the enlargement of synaptic contacts is an integral part of long-lasting strengthening of cortical connections and, hence, of information storage in the neocortex. PMID:23118196

Cheetham, Claire E J; Barnes, Samuel J; Albieri, Giorgia; Knott, Graham W; Finnerty, Gerald T

2014-02-01

464

Interstellar Grain Surface Chemistry  

NASA Technical Reports Server (NTRS)

Chemistry on grain surfaces plays an Important role in the formation of interstellar Ices, It can also influence the composition of the gas phase through outgassing near luminous, newly formed stars. This paper reviews the chemical processes taking place on Interstellar grain surfaces with the emphasis on those transforming CO into other hydrocarbons. At low, molecular cloud temperatures (approximately equal to 10K), physisorption processes dominate interstellar grain surface chemistry and GO is largely hydrogenated through reactions with atomic H and oxidized through reactions with atomic O. The former will lead to the formation of H2CO and CH3OH ices, while the latter results in CO2 ice. The observational evidence for these ices in molecular clouds will be discussed. Very close to protostars, the gas and grain temperatures are much higher (approximately equal to 500K) and chemisorption processes, including catalytic surface reactions, becomes important. This will be illustrated based upon our studies of the Fischer-Tropsch Synthesis of CH4 from CO on metallic surfaces. Likely, this process has played an important role in the early solar nebula. Observational consequences will be pointed out.

Tielens, Alexander G. G. M.; Cuzzi, Jeffrey N. (Technical Monitor)

1995-01-01

465

Viewpoints: Chemists on Chemistry  

NASA Astrophysics Data System (ADS)

It is a great pleasure for me to be associated with Viewpoints: Chemists on Chemistry, a series of papers in this Journal that will delineate the recent past and the near-term future of our science. Viewpoints is a major feature of the celebration of the Journal of Chemical Education's 75th anniversary year. It is being supported by The Camille and Henry Dreyfus Foundation, Inc., which recently celebrated its own 50th anniversary. Each paper in the Viewpoints series will be written by a chemist or group of chemists with special expertise in a particular field, with the aim of providing an overview of that field&'s accomplishments, importance, and prospects. The goal is to reflect on developments during the past 50 years and to predict how each field will evolve over the next 25 years. The total perspective encompassed by Viewpoints corresponds with the 75 years of this Journal's lifetime and reflects its comprehensive interest in all of chemistry. The 50-year retrospective view of each field corresponds with the period during which the Camille and Henry Dreyfus Foundation has been supporting the chemical sciences.

Seaborg, Glenn T.

1998-01-01

466

Chemistry 436/636 Fall 2011 Advanced Physical Chemistry  

E-print Network

/636, discusses mostly chemical applications of quantum mechanics and statistical mechanics. It also includes the fundamentals of quantum mechanics and statistical mechanics, which they learned in the basic undergraduate with physical chemistry, quantum mechanics and statistical mechanics are often the parts of physical chemistry

Raina, Ramesh

467

Chemistry 687: Statistical Mechanics and Chemistry Syllabus: Spring 2014  

E-print Network

Chemistry 687: Statistical Mechanics and Chemistry Syllabus: Spring 2014 Instructor: Prof. John D to Modern Statistical Mechanics - D. Chandler ISBN: 0195042778 Other suggested texts: (2) Introduction. Kittel ISBN: 0486435148 (4) Statistical Mechanics - D. McQuarrie (5) Molecular Driving Forces ­ K. Dill

Weeks, John D.

468

Chemistry 687: Statistical Mechanics and Chemistry Syllabus: Spring 2010  

E-print Network

Chemistry 687: Statistical Mechanics and Chemistry Syllabus: Spring 2010 Instructor: Prof. John D to Modern Statistical Mechanics - D. Chandler ISBN: 0195042778 (2) Introduction to Statistical Thermodynamics- T. Hill ISBN: 0486652424 Other suggested texts: (3) Statistical Mechanics - D. McQuarrie (4

Weeks, John D.

469

Art in Chemistry: Chemistry in Art. Second Edition  

ERIC Educational Resources Information Center

This textbook integrates chemistry and art with hands-on activities and fascinating demonstrations that enable students to see and understand how the science of chemistry is involved in the creation of art. It investigates such topics as color integrated with electromagnetic radiation, atoms, and ions; paints integrated with classes of matter,…

Greenberg, Barbara R.; Patterson, Dianne

2008-01-01

470

"F-The French Connection."  

ERIC Educational Resources Information Center

Provides background information for teachers on the chemistry of flourine. Points out that it links aerosols with refrigerants, anaesthetics with fire-fighting agents, batteries with blood substitutes, and atomic energy with the steel, petroleum, and aluminum industries. (JN)

Sleigh, John; Plevey, Ray

1986-01-01

471

Seismotectonic analysis of the Tjörnes Fracture Zone, an active transform fault in north Iceland  

Microsoft Academic Search

The Tjörnes Fracture Zone is a transform fault connecting the rift zone of the Kolbeinsey Ridge with that of north Iceland. The main transform motion takes place on the Húsavík-Flatey Fault, a major 7-9 Myr old right-lateral fault. In addition to this fault, there are two major seismic lineaments associated with the Tjörnes Fracture Zone; the Grímsey lineament and the

Sigurður T. Rögnvaldsson; Agust Gudmundsson; Ragnar Slunga

1998-01-01

472

The University of Liverpool: Research Activities in the Department of Chemistry  

NSDL National Science Digital Library

At this website, the Chemistry Department at the University of Liverpool presents its research in organic, inorganic, materials, physical, surfaces, and catalysis chemistry. The site furnishes links to over 35 faculty member homepages where users can learn about individual research interests and successes through concise descriptions and instructive figures. The Surface Science Research Centre link provides an image gallery and highlights of research projects such as _Chirality in Two-Dimensions_ and _Rare-Earth Metal Surfaces_. Through the materials provided in the Centre for Nanoscale Science and additional links, visitors can discover the research connections of the chemistry department and other departments including the Life Sciences.

473

49 CFR 71.11 - Alaska zone.  

Code of Federal Regulations, 2013 CFR

...1 2013-10-01 2013-10-01 false Alaska zone. 71.11 Section 71.11 Transportation... STANDARD TIME ZONE BOUNDARIES § 71.11 Alaska zone. The sixth zone, the Alaska standard time zone, includes the entire...

2013-10-01

474

49 CFR 71.11 - Alaska zone.  

Code of Federal Regulations, 2010 CFR

...1 2010-10-01 2010-10-01 false Alaska zone. 71.11 Section 71.11 Transportation... STANDARD TIME ZONE BOUNDARIES § 71.11 Alaska zone. The sixth zone, the Alaska standard time zone, includes the entire...

2010-10-01

475

49 CFR 71.11 - Alaska zone.  

Code of Federal Regulations, 2012 CFR

...1 2012-10-01 2012-10-01 false Alaska zone. 71.11 Section 71.11 Transportation... STANDARD TIME ZONE BOUNDARIES § 71.11 Alaska zone. The sixth zone, the Alaska standard time zone, includes the entire...

2012-10-01

476

49 CFR 71.11 - Alaska zone.  

Code of Federal Regulations, 2011 CFR

...1 2011-10-01 2011-10-01 false Alaska zone. 71.11 Section 71.11 Transportation... STANDARD TIME ZONE BOUNDARIES § 71.11 Alaska zone. The sixth zone, the Alaska standard time zone, includes the entire...

2011-10-01

477

49 CFR 71.8 - Mountain zone.  

Code of Federal Regulations, 2010 CFR

... 2010-10-01 2010-10-01 false Mountain zone. 71.8 Section 71.8 Transportation... STANDARD TIME ZONE BOUNDARIES § 71.8 Mountain zone. The fourth zone, the mountain standard time zone, includes that part...

2010-10-01

478

Chemistry -Bachelor of Science (SCHUG) Total Credits Required: 128 Chemistry -ACS Certified  

E-print Network

Chemistry - Bachelor of Science (SCHUG) Total Credits Required: 128 Chemistry - ACS Certified Major of the following courses Course Credits Course Credits CH1150 University Chemistry I AND 3 CH4110 Pharmaceutical Chemistry: Drug Action 3 CH1151 University Chemistry Lab 1 AND 1 CH4120 Pharmaceutical Chemistry: Drug

479

Chemistry -Bachelor of Science (SCH1UG) Total Credits Required: 128 Chemistry/Polymers -ACS Certified  

E-print Network

Chemistry - Bachelor of Science (SCH1UG) Total Credits Required: 128 Chemistry/Polymers - ACS credits Course Credits Course Credits CH1150 University Chemistry I AND 3 CH4610 Intro to Polymer Science 3 CH1151 University Chemistry Lab 1 AND 1 CH4620 Polymer Chemistry 3 CH1153 University Chemistry

480

Zones of Peace.  

ERIC Educational Resources Information Center

Children affected by armed violence face a specific set of stressors and challenges which calls for appropriate programming. This Coordinator's Notebook focuses on how to work with children affected by organized violence in order to provide them the best possible early childhood experiences. It is divided into five sections. "Children as Zones of…

Evans, Judith L.; And Others

1996-01-01

481

Unsaturated Zone I. Overview  

E-print Network

Chapter 2 Unsaturated Zone I. Overview If the Yucca Mountain site is deemed suitable for re of the extent of welding, the tuffs within the UZ at Yucca Mountain are grouped informally into hydrogeologic Flat undifferenti- ated (CFu) unit. The host rock at the potential repository horizon consists

482

The Dead Zone: Websites  

NSDL National Science Digital Library

This Louisiana Sea Grant College Program site offers a collection of websites regarding Gulf of Mexico hypoxia, or "dead zones" created by reduced dissolved oxygen content in the water. This collection includes general information, classroom activities, and data collected from hypoxia projects.

2009-09-02

483

Flexible 'zoning' aids adaptability.  

PubMed

Simon Corben, business development director at Capita Symonds' Health team, examines how 'clever use of zoning' when planning new healthcare facilities could improve hospital design, increase inherent flexibility, and reduce lifetime costs, and argues that a 'loose-fit, non-bespoke approach' to space planning will lead to 'more flexible buildings that are suitable for conversion to alternative uses'. PMID:24137992

Corben, Simon

2013-09-01

484

Deformation Zone Analysis  

NSDL National Science Digital Library

The quick analysis of deformation zones provides an overview of system-relative atmospheric circulations. Since deformation is a primary factor in frontogenesis and frontolysis, understanding of these system-relative circulations is crucial to the diagnosis of atmospheric processes and weather prediction. This module is part of the series: "Dynamic Feature Identification: The Satellite Palette".

Comet

2007-03-22

485

PESTICIDE ROOT ZONE MODEL  

EPA Science Inventory

PRZM3 is a modeling system that links two subordinate models - PRZM and VADOFT to predict pesticide transport and transformation down through the crop root and unsaturated zone. PRZM3 includes modeling capabilities for such phenomena as soil temperature simulation, vo...

486

Directed differential connectivity graph of interictal epileptiform discharges  

PubMed Central

In this paper, we study temporal couplings between interictal events of spatially remote regions in order to localize the leading epileptic regions from intracerebral electroencephalogram (iEEG). We aim to assess whether quantitative epileptic graph analysis during interictal period may be helpful to predict the seizure onset zone of ictal iEEG. Using wavelet transform, cross-correlation coefficient, and multiple hypothesis test, we propose a differential connectivity graph (DCG) to represent the connections that change significantly between epileptic and non-epileptic states as defined by the interictal events. Post-processings based on mutual information and multi-objective optimization are proposed to localize the leading epileptic regions through DCG. The suggested approach is applied on iEEG recordings of five patients suffering from focal epilepsy. Quantitative comparisons of the proposed epileptic regions within ictal onset zones detected by visual inspection and using electrically stimulated seizures, reveal good performance of the present method. PMID:21156385

Amini, Ladan; Jutten, Christian; Achard, Sophie; David, Olivier; Soltanian-Zadeh, Hamid; Hossein-Zadeh, Gh. Ali; Kahane, Philippe; Minotti, Lorella; Vercueil, Laurent

2011-01-01

487

Teaching and Learning in Chemistry  

ERIC Educational Resources Information Center

Brief description of lectures presented in a conference on Nuffield project with emphasis on chemistry teaching. There is a need for the philosophy of the Nuffield project at the college level. Less emphasis should be placed on factual information in chemistry at college level. (PS)

Education in Chemistry, 1972

1972-01-01

488

Stereochemical Control in Carbohydrate Chemistry  

ERIC Educational Resources Information Center

Carbohydrates, in the form of glycoconjugates, have recently been shown to control a wide range of cellular processes. Accordingly, students interested in the study of organic chemistry and biomedical sciences should be exposed to carbohydrate chemistry. To this end, we have developed a sequence of experiments that leads the student from the…

Batchelor, Rhys; Northcote, Peter T.; Harvey, Joanne E.; Dangerfield, Emma M.; Stocker, Bridget L.

2008-01-01

489

REDUCED CHEMISTRY-DIFFUSION COUPLING  

Microsoft Academic Search

In reacting flow problems involving large numbers of chemical species and reactions, reduced chemistry modeling is used to approximately describe, with fewer unknowns, the slow chemical evolutions after the rapid but brief initial transients have decayed. Diffusion transport terms, if present, are modified by the reduced chemistry approximations. This article reiterates that the use of unmodified diffusion terms along with

S. H. LAM

2007-01-01

490

Chemistry laboratory safety manual available  

NASA Technical Reports Server (NTRS)

Chemistry laboratory safety manual outlines safe practices for handling hazardous chemicals and chemistry laboratory equipment. Included are discussions of chemical hazards relating to fire, health, explosion, safety equipment and procedures for certain laboratory techniques and manipulations involving glassware, vacuum equipment, acids, bases, and volatile solvents.

Elsbrock, R. G.

1968-01-01

491

Green chemistry as systems science  

Microsoft Academic Search

Green chemistry does not operate as an isolated subsystem, but within higher lev- els of corporation and society. From an environmental standpoint, the ideal focus is to achieve optimum performance across the system, not at a single systems level. This paper proposes a four-level system for green chemistry and provides examples of performance at each level that can legitimately be

Thomas E. Graedel

2001-01-01

492

Remedial Mathematics for Quantum Chemistry  

ERIC Educational Resources Information Center

Proper mathematical skills are important for every science course and mathematics-intensive chemistry courses rely on a sound mathematical pre-knowledge. In the first-year quantum chemistry course at this university, it was noticed that many students lack basic mathematical knowledge. To tackle the mathematics problem, a remedial mathematics…

Koopman, Lodewijk; Brouwer, Natasa; Heck, Andre; Buma, Wybren Jan

2008-01-01

493

Crocodile Chemistry. [CD-ROM].  

ERIC Educational Resources Information Center

This high school chemistry resource is an on-screen chemistry lab. In the program, students can experiment with a huge range of chemicals, choosing the form, quantity and concentrations. Dangerous or difficult experiments can be investigated safely and easily. A vast range of equipment can be set up, and complex simulations can be put together and…

1999

494

Contextualising Nanotechnology in Chemistry Education  

ERIC Educational Resources Information Center

In recent years nanotechnology has become part of the content of many undergraduate chemistry and physics degree courses. This paper deals with the role of contextualisation of nanotechnology in the delivery of the content, as nanotechnology is only now being slowly integrated into many chemistry degree courses in Ireland and elsewhere. An…

O'Connor, Christine; Hayden, Hugh

2008-01-01

495

Mathcad in the Chemistry Curriculum  

Microsoft Academic Search

Mathcad in the Chemistry Curriculum is a feature column of the newest publication of the Journal of Chemical Education, JCE Internet. As with everything published by JCE Internet, abstracts for the peer-reviewed articles in the first of these columns appear below. In this column you will find Mathcad documents and templates that can be used in courses throughout the chemistry

Theresa Julia Zielinski

1998-01-01

496

Local Evaluation of Chemistry Journals  

ERIC Educational Resources Information Center

This paper reports on the evaluation of local usage statistics of a specific set of chemistry journals at the University of Denver in Colorado, USA. The objective of the study is to demonstrate that commercial publishers in chemistry charge considerably more for their journals than those from the non-commercial sector. There are three variables…

Kraus, Joseph R.; Hansen, Rachel

2008-01-01

497

Chemical Principles Revisited: Petroleum Chemistry.  

ERIC Educational Resources Information Center

Presents an historical review of the role of petroleum in world history and information on the chemistry of petroleum. It is suggested that petroleum chemistry be discussed since within the next two decades oil and gas will provide the major portion of U.S. energy. (Author/SA)

Kolb, Doris; Kolb, Kenneth E.

1979-01-01

498

Introducing Relativity into Quantum Chemistry  

ERIC Educational Resources Information Center

It is not often realized by chemists that the special theory of relativity is behind several aspects of quantum chemistry. The Schrdinger equation itself is based on relations between space-time and energy-momentum four vectors. Electron spin is, of course, the most obvious manifestation of relativity. The chemistry of some heavy elements is…

Li, Wai-Kee; Blinder, S. M.

2011-01-01

499

Dendrimer-Supported Combinatorial Chemistry  

Microsoft Academic Search

A new methodology for the construction of combinatorial libraries is described. The approach, termed dendrimer-supported combinatorial chemistry (DCC), centers on the use of dendrimers as soluble supports. Salient features of DCC include solution phase chemistry, homogeneous purification, routine characterization of intermediates, and high support loadings. To demonstrate the feasibility of DCC, single compounds and a small combinatorial library were prepared

Ronald M. Kim; Mahua Manna; Steven M. Hutchins; Patrick R. Griffin; Nathan A. Yates; Amy M. Bernick; Kevin T. Chapman

1996-01-01

500

The Radiation Chemistry Data Center  

NSDL National Science Digital Library

The Radiation Chemistry Data Center is an information resource provided by the Notre Dame Radiation Laboratory that is "dedicated to the collection, evaluation, and dissemination of data characterizing the reactions of transient intermediates produced by radiation chemical and photochemical methods." The main page offers links to Compilations of Chemical Property Data, Kinetics Databases, a Bibliographic Database, and Recent Papers in Radiation Chemistry and Photochemistry.

Madden, K. P.

2007-05-15