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Sample records for 60 200 mesh illinois

  1. Chicago, Illinois as seen from STS-60

    NASA Technical Reports Server (NTRS)

    1994-01-01

    The Chicago, Illinois area is in this northeast looking low oblique view obtained during STS-60. A good portion of Lake Michigan is covered with ice due to the very cold winter weather. The Des Plaines river is visible traversing northeast to southwest throught the center of the city. O'Hare International Airport and the Glenview Naval Air Station can be seen to the north of the Des Plaines River. Midway Airport is visible just to the south of the river.

  2. 34 CFR 200.60 - Expenditures for professional development.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... 34 Education 1 2011-07-01 2011-07-01 false Expenditures for professional development. 200.60... Paraprofessionals § 200.60 Expenditures for professional development. (a)(1) Except as provided in paragraph (a)(2... professional development activities to ensure that teachers and paraprofessionals meet the requirements...

  3. 34 CFR 200.60 - Expenditures for professional development.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... professional development activities to ensure that teachers and paraprofessionals meet the requirements of... 34 Education 1 2012-07-01 2012-07-01 false Expenditures for professional development. 200.60... Paraprofessionals § 200.60 Expenditures for professional development. (a)(1) Except as provided in paragraph...

  4. 34 CFR 200.60 - Expenditures for professional development.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... professional development activities to ensure that teachers and paraprofessionals meet the requirements of... 34 Education 1 2010-07-01 2010-07-01 false Expenditures for professional development. 200.60... Paraprofessionals § 200.60 Expenditures for professional development. (a)(1) Except as provided in paragraph...

  5. 34 CFR 200.60 - Expenditures for professional development.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... professional development activities to ensure that teachers and paraprofessionals meet the requirements of... 34 Education 1 2013-07-01 2013-07-01 false Expenditures for professional development. 200.60... Paraprofessionals § 200.60 Expenditures for professional development. (a)(1) Except as provided in paragraph...

  6. 34 CFR 200.60 - Expenditures for professional development.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... professional development activities to ensure that teachers and paraprofessionals meet the requirements of... 34 Education 1 2014-07-01 2014-07-01 false Expenditures for professional development. 200.60... Paraprofessionals § 200.60 Expenditures for professional development. (a)(1) Except as provided in paragraph...

  7. 2 CFR 200.60 - Intermediate cost objective.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ... objective. Intermediate cost objective means a cost objective that is used to accumulate indirect costs or service center costs that are subsequently allocated to one or more indirect cost pools or final cost... 2 Grants and Agreements 1 2014-01-01 2014-01-01 false Intermediate cost objective. 200.60...

  8. Adsorption of various alcohols on Illinois No. 6 coal in aqueous solutions

    SciTech Connect

    Kwon, K.C.; Rigby, R.R.

    1993-07-01

    Hydrophilicity, hydrophobicity and aromacity of Illinois {number_sign}6 coal in water are relatively determined by evaluating equilibrium physical/chemical adsorption of probe compounds on the coal. Experiments on equilibrium adsorption loadings of various additives on 60--200 mesh Illinois {number_sign}6 coal (DECS-2; Randolph county) were performed to investigate relatively surface properties of the coal at 25{degree}C. The additives include various alcohols, alkanes and aromatic compounds. The main objectives of this research are to evaluate relatively surface properties of raw coals, treated coals and coal minerals with the inverse liquid chromatography technique, using various probe compounds, to analyze flotation recoveries of coals with a micro-flotation apparatus in order to relate coal floatability to evaluated coal surface properties, and to delineate roles of coal-cleaning/handling additives with the inverse liquid chromatography technique.

  9. 24 CFR 200.60 - Assurance of completion for offsite facilities.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ... HOUSING AND URBAN DEVELOPMENT GENERAL INTRODUCTION TO FHA PROGRAMS Requirements for Application... 24 Housing and Urban Development 2 2011-04-01 2011-04-01 false Assurance of completion for offsite facilities. 200.60 Section 200.60 Housing and Urban Development Regulations Relating to Housing and...

  10. Detached Eddy Simulation of the UH-60 Rotor Wake Using Adaptive Mesh Refinement

    NASA Technical Reports Server (NTRS)

    Chaderjian, Neal M.; Ahmad, Jasim U.

    2012-01-01

    Time-dependent Navier-Stokes flow simulations have been carried out for a UH-60 rotor with simplified hub in forward flight and hover flight conditions. Flexible rotor blades and flight trim conditions are modeled and established by loosely coupling the OVERFLOW Computational Fluid Dynamics (CFD) code with the CAMRAD II helicopter comprehensive code. High order spatial differences, Adaptive Mesh Refinement (AMR), and Detached Eddy Simulation (DES) are used to obtain highly resolved vortex wakes, where the largest turbulent structures are captured. Special attention is directed towards ensuring the dual time accuracy is within the asymptotic range, and verifying the loose coupling convergence process using AMR. The AMR/DES simulation produced vortical worms for forward flight and hover conditions, similar to previous results obtained for the TRAM rotor in hover. AMR proved to be an efficient means to capture a rotor wake without a priori knowledge of the wake shape.

  11. Comparison of corneal flaps created by Wavelight FS200 and Intralase FS60 femtosecond lasers

    PubMed Central

    Liu, Qian; Zhou, Yue-Hua; Zhang, Jing; Zheng, Yan; Zhai, Chang-Bin; Liu, Jing

    2016-01-01

    AIM To assess and compare the morphology of corneal flaps created by the Wavelight FS200 and Intralase FS60 femtosecond lasers in laser in situ keratomileusis (LASIK). METHODS Four hundred eyes of 200 patients were enrolled in this study and divided into Wavelight FS200 groups (200 eyes) and Intralase FS60 groups (200 eyes). Fourier-domain optical coherence tomography (RTVue OCT) was used to measure the corneal flap thickness of 36 specified measurements on each flap one week after surgery. Results were used to analyze the regularity, uniformity and accuracy of the two types of LASIK flaps. RESULTS The mean thickness of corneal flap and central flap was 105.71±4.72 µm and 105.39±4.50 µm in Wavelight FS200 group and 109.78±11.42 µm and 109.15 ±11.59 µm in Intralase FS60 group, respectively. The flaps made with the Wavelight FS200 femtosecond laser were thinner than those created by the Intralase FS60 femtosecond laser (P=0.000). Corneal flaps in the 2 groups were uniform and regular, showing an almost planar configuration. But the Wavelight FS200 group has more predictability and uniformity of flap creation. The mean deviation between achieved and attempted flap thickness was smaller in the Wavelight FS200 group than that in the Intralase FS60 group, which were 5.18±3.71 µm and 8.68±7.42 µm respectively. The deviation of more than 20 µm was 0.2% measurements in Wavelight FS200 group and 8.29% measurements in Intralase FS60 group. CONCLUSION The morphologies of flaps created by Wavelight FS200 are more uniform and thinner than those created by Intralase FS60. PMID:27500109

  12. 40 CFR 60.200 - Applicability and designation of affected facility.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... Performance for the Phosphate Fertilizer Industry: Wet-Process Phosphoric Acid Plants § 60.200 Applicability... subpart apply is each wet-process phosphoric acid plant having a design capacity of more than 15 tons...

  13. 40 CFR 60.200 - Applicability and designation of affected facility.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... Performance for the Phosphate Fertilizer Industry: Wet-Process Phosphoric Acid Plants § 60.200 Applicability... subpart apply is each wet-process phosphoric acid plant having a design capacity of more than 15 tons...

  14. 40 CFR 60.200 - Applicability and designation of affected facility.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... Performance for the Phosphate Fertilizer Industry: Wet-Process Phosphoric Acid Plants § 60.200 Applicability... subpart apply is each wet-process phosphoric acid plant having a design capacity of more than 15 tons...

  15. 40 CFR 60.200 - Applicability and designation of affected facility.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... Performance for the Phosphate Fertilizer Industry: Wet-Process Phosphoric Acid Plants § 60.200 Applicability... subpart apply is each wet-process phosphoric acid plant having a design capacity of more than 15 tons...

  16. 40 CFR 60.200 - Applicability and designation of affected facility.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... Performance for the Phosphate Fertilizer Industry: Wet-Process Phosphoric Acid Plants § 60.200 Applicability... subpart apply is each wet-process phosphoric acid plant having a design capacity of more than 15 tons...

  17. Density functional calculation of superatomic molecular orbitals in C60: First truly converged results on a real grid mesh

    NASA Astrophysics Data System (ADS)

    Drake, Kyle; Bonacum, Jason; Zhang, Guo-Ping

    2014-03-01

    The molecular structure of Buckminster fullerene (C60) allows for electron delocalization in all of the pi-bonding electrons of the molecule. This coupled with the symmetry of the molecule allows for the formation of super-atomic molecular orbitals (SAMOs) similar to those observed in aluminum clusters. The SAMOs behave as if the molecule that they belong to is a single atom. We compute the eigenstates of C60 compulationally using density functional theory (DFT) and a grid mesh. Using larger radii also allows us to accurately describe SAMOs and test the convergence of our data. The results are interesting because for the first time, we can show the true converged super atomic orbitals in C60. Indiana State University SURE Program, Department of Energy, Indiana State University Department of Physics, and Indiana State University Center for Student Creativity and Research.

  18. First 200 kW CW operation of a 60 GHz gyrotron

    SciTech Connect

    Jory, H.; Bier, R.; Evans, S.; Felch, K.; Fox, L.; Huey, H.; Shively, J.; Spang, S.

    1983-01-01

    The gyrotron is a microwave tube which employs the electron cyclotron maser interaction to produce high power output at millimeter wavelengths. It has important and growing applications for heating of plasmas in controlled thermonuclear fusion experiments. The Varian 60 GHz gyrotron has recently generated microwave power in excess of 200 kW during CW operation, wth excellent dynamic range and operating stability. This is the highest average power ever produced by a microwave tube in the millimeter wave region. A description of the gyrotron design and test results are presented.

  19. Computation of UH-60A Airloads Using CFD/CSD Coupling on Unstructured Meshes

    NASA Technical Reports Server (NTRS)

    Biedron, Robert T.; Lee-Rausch, Elizabeth M.

    2011-01-01

    An unsteady Reynolds-averaged Navier-Stokes solver for unstructured grids is used to compute the rotor airloads on the UH-60A helicopter at high-speed and high thrust conditions. The flow solver is coupled to a rotorcraft comprehensive code in order to account for trim and aeroelastic deflections. Simulations are performed both with and without the fuselage, and the effects of grid resolution, temporal resolution and turbulence model are examined. Computed airloads are compared to flight data.

  20. Advanced characterization of forms of chlorine, organic sulfur and trace elements in available coals from operating Illinois mines. Quarterly report, 1 March 1995--31 May 1995

    SciTech Connect

    Chou, M.I.M.; Demir, I; Ruch, R.R.; Lytle, J.M.; Bhagway, S; Li, Y.C.; Chou, C.L.; Huggins, F.E.; Huffman, G.P.

    1995-12-31

    The goals of the study are (1) to use X-ray absorption near-edge spectroscopy (XANES) to determine forms of chlorine (inorganic, ionic, and organic) and forms of organic sulfur (organic sulfide and thiophenic sulfur) in as-shipped coals from Illinois mines, (2) to obtain basic data on chlorine removal via froth flotation at fine ({minus}200 mesh) and ultrafine ({minus}400 mesh) particle sizes, and (3) to evaluate XANES for direct assessment of the organic/inorganic affinities of trace elements. In the last quarter, chlorine leachability during fine wet grinding of 21 coal samples was examined. In this quarter, the effect of froth flotation/release analysis (FF/RA) on the Cl contents of coals ground to {minus}200 and {minus}400 mesh sizes is completed. The results indicate that a combination of wet grinding and FF/RA reduced Cl contents in most samples from regions 1,2, and 3 by 29--81% and in one sample from region 4S by 60%. The chlorine and sulfur spectra of 21 coals, from five distinct geographic locations in Illinois, were examined. The chlorine XANES spectra for the coals are similar and chloride anion was determined to be the predominant form of chlorine. The sulfur XANES data for these coals show that a majority (61% to 82%) of organic sulfur in the thiophenic form. The ratios of thiophenic sulfur to total organic sulfur show a correlation with sample location. For samples from regions 1 and 2, the ratios are relatively lower (61% to 64%), whereas, for samples from regions 3, 4H, and 4S, the ratios are relatively higher (64% to 82%). A more detailed interpretation in these correlations will be discussed in the next report.

  1. 17 CFR 200.60 - Qualification to participate in particular matters.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... EXCHANGE COMMISSION ORGANIZATION; CONDUCT AND ETHICS; AND INFORMATION AND REQUESTS Canons of Ethics § 200.... He should disqualify himself in the event he obtained knowledge prior to becoming a member of...

  2. Recovery of macroinvertebrates by screening in the field: a comparison between coarse (1.18 mm) and fine (0.60 mm) mesh sieves

    USGS Publications Warehouse

    Dukerschein, J.T.; Gent, R.; Sauer, J.

    1996-01-01

    We evaluated the potential loss of target benthic macroinvertebrates from coarse-mesh field wash down of samples through a 1.18-mm mesh sieve nested on a 0.60-mm mesh sieve. Visible target organisms (midges, mayflies, and fingernail clams) in the 1.18-mm mesh sieve were removed from the sample and enumerated in the field. The entire contents of both sieves were preserved for subsequent laboratory enumeration under 4X magnification. Percent recoveries from each treatment were based on total intact organisms found in all sieves. Percent recovery for fingernail clams found in the field (31%) was lower than for mayflies (79%) and midges (88%). Laboratory enumeration of organisms retained by the 1.18-mm sieve yielded additional fingernail clams (to total 74% recovered in the field and lab), mayflies (to total 89%), and midges (to total 91%). If the 1.18-mm sieve is used alone in the field, it is adequate to monitor mayflies, midges >1 cm, and adult fingernail clams greater than or equal to 5.0 mm shell length.

  3. Optical properties of zirconium carbide in 60-200 Å wavelength region using x-ray reflectivity technique.

    PubMed

    Singh, Amol; Modi, Mohammed H; Lodha, G S

    2015-01-10

    Optical constants of zirconium carbide (ZrC) have been determined in the soft x-ray region of 60-200 Å wavelength using angle-dependent x-ray reflectivity measurements. Reflectivity measurements are carried out at the reflectivity beamline of the Indus-1 synchrotron radiation source. Derived optical constants (δ and β) are compared with the tabulated values [At. Data Nucl. Data Tables 54, 181 (1993)]. The optical constants are 15%-35% lower than bulk values in the 60-200 Å wavelength region. Near the Zr M4 edge 187 eV (66.3 Å), the δ values were close to bulk values with a deviation of 5%-10%. A large deviation of ∼20% was found in beta values especially near the Zr M4 edge region, whereas it was in close agreement in the wavelength range away from the edge. To the best of our knowledge, this paper gives the first reported experimental values of optical constants for zirconium carbide in the 60-200 Å wavelength region. PMID:25967623

  4. Illinois Wind Workers Group

    SciTech Connect

    David G. Loomis

    2012-05-28

    The Illinois Wind Working Group (IWWG) was founded in 2006 with about 15 members. It has grown to over 200 members today representing all aspects of the wind industry across the State of Illinois. In 2008, the IWWG developed a strategic plan to give direction to the group and its activities. The strategic plan identifies ways to address critical market barriers to the further penetration of wind. The key to addressing these market barriers is public education and outreach. Since Illinois has a restructured electricity market, utilities no longer have a strong control over the addition of new capacity within the state. Instead, market acceptance depends on willing landowners to lease land and willing county officials to site wind farms. Many times these groups are uninformed about the benefits of wind energy and unfamiliar with the process. Therefore, many of the project objectives focus on conferences, forum, databases and research that will allow these stakeholders to make well-educated decisions.

  5. Advanced characterization of forms of chlorine, organic sulfur and trace elements in available coals from operating Illinois mines. Quarterly report, 1 December 1994--28 February 1995

    SciTech Connect

    Chou, M.I.M.; Demir, I.; Ruch, R.R.; Lytle, S.

    1995-12-31

    The goals of the study are (1) to use X-ray absorption near-edge spectroscopy (XANES) to determine forms of chlorine (inorganic, ionic, and organic) and forms of organic sulfur (organic sulfide and thiophenic sulfur) in as-shipped coals from Illinois mines, (2) to obtain basic data on chlorine removal via froth flotation at fine ({minus}200 mesh) and ultrafine ({minus}400 mesh) particle sizes, and (3) to evaluate XANES for direct assessment of the organic/inorganic affinities of trace elements. This is a cooperative effort among the Illinois State Geological Survey, the University of Kentucky, and Western Kentucky University. In this quarter, chlorine leachability during fine wet grinding of 21 coal samples was examined. The results show a general improvement in chlorine removal by grinding coals to {minus}200 mesh, but do not show further improvement by additional grinding to {minus}400 mesh. The chlorine and sulfur spectra of five coals , each from a distinct geographic location in Illinois, were examined. The chlorine XANES spectra for the five coals are similar and chloride anion was determined to be the predominant form of chlorine. The sulfur XANES data for the same coals show that a majority (61% to 82%) of organic sulfur in the coals is contributed from thiophenic sulfur. The distribution of organic sulfur shows that the high sulfur coals tend to have more organic sulfide than low sulfur coals. A more detailed interpretation may be possible after a complete analysis of all the samples selected. Evaluating the possibility of XANES for direct assessment of the organic/inorganic affinities of trace elements in an Illinois coal was completed.

  6. Surgical Mesh

    MedlinePlus

    ... Device Safety Safety Communications Surgical Mesh: FDA Safety Communication Share Tweet Linkedin Pin it More sharing options ... Prolapse and Stress Urinary Incontinence More in Safety Communications Information About Heparin Preventing Tubing and Luer Misconnections ...

  7. Cu Mesh for Flexible Transparent Conductive Electrodes

    PubMed Central

    Kim, Won-Kyung; Lee, Seunghun; Hee Lee, Duck; Hee Park, In; Seong Bae, Jong; Woo Lee, Tae; Kim, Ji-Young; Hun Park, Ji; Chan Cho, Yong; Ryong Cho, Chae; Jeong, Se-Young

    2015-01-01

    Copper electrodes with a micromesh/nanomesh structure were fabricated on a polyimide substrate using UV lithography and wet etching to produce flexible transparent conducting electrodes (TCEs). Well-defined mesh electrodes were realized through the use of high-quality Cu thin films. The films were fabricated using radio-frequency (RF) sputtering with a single-crystal Cu target—a simple but innovative approach that overcame the low oxidation resistance of ordinary Cu. Hybrid Cu mesh electrodes were fabricated by adding a capping layer of either ZnO or Al-doped ZnO. The sheet resistance and the transmittance of the electrode with an Al-doped ZnO capping layer were 6.197 ohm/sq and 90.657%, respectively, and the figure of merit was 60.502 × 10–3/ohm, which remained relatively unchanged after thermal annealing at 200 °C and 1,000 cycles of bending. This fabrication technique enables the mass production of large-area flexible TCEs, and the stability and high performance of Cu mesh hybrid electrodes in harsh environments suggests they have strong potential for application in smart displays and solar cells. PMID:26039977

  8. Cu mesh for flexible transparent conductive electrodes.

    PubMed

    Kim, Won-Kyung; Lee, Seunghun; Hee Lee, Duck; Hee Park, In; Seong Bae, Jong; Woo Lee, Tae; Kim, Ji-Young; Hun Park, Ji; Chan Cho, Yong; Ryong Cho, Chae; Jeong, Se-Young

    2015-01-01

    Copper electrodes with a micromesh/nanomesh structure were fabricated on a polyimide substrate using UV lithography and wet etching to produce flexible transparent conducting electrodes (TCEs). Well-defined mesh electrodes were realized through the use of high-quality Cu thin films. The films were fabricated using radio-frequency (RF) sputtering with a single-crystal Cu target--a simple but innovative approach that overcame the low oxidation resistance of ordinary Cu. Hybrid Cu mesh electrodes were fabricated by adding a capping layer of either ZnO or Al-doped ZnO. The sheet resistance and the transmittance of the electrode with an Al-doped ZnO capping layer were 6.197 ohm/sq and 90.657%, respectively, and the figure of merit was 60.502 × 10(-3)/ohm, which remained relatively unchanged after thermal annealing at 200 °C and 1,000 cycles of bending. This fabrication technique enables the mass production of large-area flexible TCEs, and the stability and high performance of Cu mesh hybrid electrodes in harsh environments suggests they have strong potential for application in smart displays and solar cells. PMID:26039977

  9. Illinois' Career Cluster Model

    ERIC Educational Resources Information Center

    Jankowski, Natasha A.; Kirby, Catherine L.; Bragg, Debra D.; Taylor, Jason L.; Oertle, Kathleen M.

    2009-01-01

    This booklet provides information to multiple stakeholders on the implementation of career clusters in Illinois. The booklet is an extension of the previous edition titled "An Introduction to Illinois CTE Programs of Study" (2008), and provides a resource for partners to understand Illinois' Career Cluster Model as its own adaptation of the…

  10. Energy response of GR-200A thermoluminescence dosemeters to 60Co and to monoenergetic synchrotron radiation in the energy range 28-40 keV.

    PubMed

    Emiro, F; Di Lillo, F; Mettivier, G; Fedon, C; Longo, R; Tromba, G; Russo, P

    2016-01-01

    The response of LiF:Mg,Cu,P thermoluminescence dosemeters (type GR-200A) to monoenergetic radiation of energy 28, 35, 38 and 40 keV was evaluated with respect to irradiation with a calibrated (60)Co gamma-ray source. High-precision measurements of the relative air kerma response performed at the SYRMEP beamline of the ELETTRA synchrotron radiation facility (Trieste, Italy) showed a significant deviation of the average response to low-energy X-rays from that to (60)Co, with an over-response from 6 % (at 28 keV) to 22 % (at 40 keV). These data are not consistent with literature data for these dosemeters, where model predictions gave deviation from unity of the relative air kerma response of about 10 %. The authors conclude for the need of additional determinations of the low-energy relative response of GR-200A dosemeters, covering a wider range of monoenergetic energies sampled at a fine energy step, as planned in future experiments by their group at the ELETTRA facility. PMID:25737582

  11. Washability of trace elements in product coals from Illinois mines. Technical report, 1 March--31 May 1994

    SciTech Connect

    Demir, I.; Ruch, R.R.; Harvey, R.D.; Steele, J.D.; Khan, S.

    1994-09-01

    Existing washability data on trace elements in Illinois coals were generated using float-sink methods, which are not applicable to modern froth flotation or column flotation processes. Particularly, there is a lack of washability data on product (as-shipped) coals from modern preparation plants. The goal of this project is to provide the needed trace element washability (release analysis) data on as-shipped Illinois coals using a froth flotation/release analysis (FF/RA) procedure. The results generated by this project will promote industrial utilization of Illinois coals and help assess the effect of new environmental requirements on the use of these coals in utility steam generation. During the third quarter, preparation and submission of all samples for chemical analysis were completed. Analyses of the samples produced by cleaning 34 as-shipped coals using FF/RA were completed for ash, moisture, S, heating value (BTU), and F, and some for Mn and oxide composition. The rest of the analytical work is in progress. The analytical data are being used to evaluate removal of ash, S, and trace elements from the as-shipped coals at the chosen flotation conditions and particles sizes. Available data on the FF/RA of five as-shipped coals at {minus}100, {minus}200, {minus}400 mesh sizes indicate that ash and F rejections increase with decreasing particle size. For the {minus}400 mesh tests, 70--90% of the ash and 35--74% of F were rejected at a BTU or combustibles recovery of 80%. One of the as-shipped coals was previously subjected to FF/RA tests at {minus}100 and {minus}400 mesh sizes to investigate mass balances achievable for the procedure. Preliminary results on ash and F contents of complete set of flotation products from the two tests indicate a mass balance of 95 to 100%.

  12. MeshKit

    2010-10-05

    MeshKit is an open-source library of mesh generation functionality. MeshKit has general mesh manipulation and generation functions such as Copoy, Move, Rotate and Extrude mesh. In addition, new quad mesh and embedded boundary Cartesian mesh algorithm (EB Mesh) are included. Interfaces to several public domain meshing algorithms (TetGen, netgen, triangle, Gmsh, camal) are also offered. This library interacts with mesh data mostly through iMesh including accessing the mesh in parallel. It also can interact withmore » iGeom interface to provide geometry functionality such as importing solid model based geometries. iGeom and IMesh are implemented in the CGM and MOAB packages, respectively. For some non-existing function in iMesh such as tree-construction and ray-tracing, MeshKit also interacts with MOAB functions directly.« less

  13. MeshKit

    SciTech Connect

    2010-10-05

    MeshKit is an open-source library of mesh generation functionality. MeshKit has general mesh manipulation and generation functions such as Copoy, Move, Rotate and Extrude mesh. In addition, new quad mesh and embedded boundary Cartesian mesh algorithm (EB Mesh) are included. Interfaces to several public domain meshing algorithms (TetGen, netgen, triangle, Gmsh, camal) are also offered. This library interacts with mesh data mostly through iMesh including accessing the mesh in parallel. It also can interact with iGeom interface to provide geometry functionality such as importing solid model based geometries. iGeom and IMesh are implemented in the CGM and MOAB packages, respectively. For some non-existing function in iMesh such as tree-construction and ray-tracing, MeshKit also interacts with MOAB functions directly.

  14. Mersiline mesh in premaxillary augmentation.

    PubMed

    Foda, Hossam M T

    2005-01-01

    Premaxillary retrusion may distort the aesthetic appearance of the columella, lip, and nasal tip. This defect is characteristically seen in, but not limited to, patients with cleft lip nasal deformity. This study investigated 60 patients presenting with premaxillary deficiencies in which Mersiline mesh was used to augment the premaxilla. All the cases had surgery using the external rhinoplasty technique. Two methods of augmentation with Mersiline mesh were used: the Mersiline roll technique, for the cases with central symmetric deficiencies, and the Mersiline packing technique, for the cases with asymmetric deficiencies. Premaxillary augmentation with Mersiline mesh proved to be simple technically, easy to perform, and not associated with any complications. Periodic follow-up evaluation for a mean period of 32 months (range, 12-98 months) showed that an adequate degree of premaxillary augmentation was maintained with no clinically detectable resorption of the mesh implant. PMID:15959688

  15. Spherical geodesic mesh generation

    SciTech Connect

    Fung, Jimmy; Kenamond, Mark Andrew; Burton, Donald E.; Shashkov, Mikhail Jurievich

    2015-02-27

    In ALE simulations with moving meshes, mesh topology has a direct influence on feature representation and code robustness. In three-dimensional simulations, modeling spherical volumes and features is particularly challenging for a hydrodynamics code. Calculations on traditional spherical meshes (such as spin meshes) often lead to errors and symmetry breaking. Although the underlying differencing scheme may be modified to rectify this, the differencing scheme may not be accessible. This work documents the use of spherical geodesic meshes to mitigate solution-mesh coupling. These meshes are generated notionally by connecting geodesic surface meshes to produce triangular-prismatic volume meshes. This mesh topology is fundamentally different from traditional mesh topologies and displays superior qualities such as topological symmetry. This work describes the geodesic mesh topology as well as motivating demonstrations with the FLAG hydrocode.

  16. Washability of trace elements in product coals from Illinois mines. Technical report, 1 December 1993--28 February 1994

    SciTech Connect

    Demir, I.; Ruch, R.R.; Harvey, R.D.; Steele, J.D.; Khan, S.

    1994-06-01

    The existing trace element washability data on Illinois coals are based on float-sink methods, and these data are not applicable to modern froth flotation or column flotation processes. Particularly, there is a lack of washability data on samples from modern preparation plants, as well as other product (as-shipped) coals. The goal of this project is to provide the needed trace element washability data on as-shipped coals that were collected during 1992--1993 from Illinois mines. During the second quarter, froth flotation/release analysis (FF/RA) tests on 34 project samples were completed at {minus}100, {minus}200, and {minus}400 mesh particle sizes. Products from the FF/RA tests were analyzed for ash, moisture, and some for total S and heating value (BTU), and the resulting data are being used to construct a series of washability curves. For example, these curves can show variation in BTU or combustible recovery as a function of the amount of ash or S rejected. Composite samples, each having 80% of the total BTU (or combustibles), were prepared for the {minus}100 and {minus}200 mesh FF/RA tests and submitted for trace element analysis. The composite samples for the {minus}400 mesh FF/RA tests will be submitted soon, and the analytical results are expected to be available in 3--4 months. The trace element data on the composite samples will indicate the potential for the removal of each element from the coals at the chosen flotation conditions and particle sizes.

  17. Illinois Early Learning Standards.

    ERIC Educational Resources Information Center

    2002

    The Illinois Early Learning Standards were developed by the Illinois State Board of Education with the assistance of hundreds of educators. The goal of the standards is to provide teachers and caregivers useful information that is directly needed as part of their daily classroom work. Based on comments from educators, parents, and various experts…

  18. The Illinois Rivers Project.

    ERIC Educational Resources Information Center

    Williams, Robert A.; And Others

    The Illinois Rivers Project was developed as an integrated, multidimensional science/technology/society pilot project designed to introduce water quality dimensions into Illinois high schools. The project involved high school science, social science, and English teachers in an integrated study of their local river and community. Science students…

  19. Single port laparoscopic mesh rectopexy

    PubMed Central

    2016-01-01

    Introduction Traditionally, laparoscopic mesh rectopexy is performed with four ports, in an attempt to improve cosmetic results. Following laparoscopic mesh rectopexy there is a new operative technique called single-port laparoscopic mesh rectopexy. Aim To evaluate the single-port laparoscopic mesh rectopexy technique in control of rectal prolapse and the cosmesis and body image issues of this technique. Material and methods The study was conducted in El Fayoum University Hospital between July 2013 and November 2014 in elective surgery for symptomatic rectal prolapse with single-port laparoscopic mesh rectopexy on 10 patients. Results The study included 10 patients: 3 (30%) males and 7 (70%) females. Their ages ranged between 19 years and 60 years (mean: 40.3 ±6 years), and they all underwent laparoscopic mesh rectopexy. There were no conversions to open technique, nor injuries to the rectum or bowel, and there were no mortalities. Mean operative time was 120 min (range: 90–150 min), and mean hospital stay was 2 days (range: 1–3 days). Preoperatively, incontinence was seen in 5 (50%) patients and constipation in 4 (40%). Postoperatively, improvement in these symptoms was seen in 3 (60%) patients for incontinence and in 3 (75%) for constipation. Follow-up was done for 6 months and no recurrence was found with better cosmetic appearance for all patients. Conclusions Single-port laparoscopic mesh rectopexy is a safe procedure with good results as regards operative time, improvement in bowel function, morbidity, cost, and recurrence, and with better cosmetic appearance. PMID:27350840

  20. Sensibility of grey particle production system to energy and centrality in 60A and 200A GeV 16O-Nucleus interactions

    NASA Astrophysics Data System (ADS)

    Abdelsalam, A.; El–Nagdy, M. S.; Badawy, B. M.; Osman, W.; Fayed, M.

    2016-06-01

    The grey particle production following 60 A and 200A GeV 16O interactions with emulsion nuclei is investigated at different centralities. The evaporated target fragment multiplicity is voted as a centrality parameter. The target size effect is examined over a wide range, where the C, N and O nuclei present the light target group while the Br and Ag nuclei are the heavy group. In the framework of the nuclear limiting fragmentation hypothesis, the grey particle multiplicity characteristics depend only on the target size and centrality while the projectile size and energy are not effective. The grey particle is suggested to be a multisource production system. The emission direction in the 4π space depends upon the production source. Either the exponential decay or the Poisson’s peaking curves are the usual characteristic shapes of the grey particle multiplicity distributions. The decay shape is suggested to be a characteristic feature of the source singularity while the peaking shape is a multisource super-position. The sensibility to the centrality varies from a source to other. The distribution shape is identified at each centrality region according to the associated source contribution. In general, the multiplicity characteristics seem to be limited w.r.t. the collision system centrality using light target nuclei. The selection of the black particle multiplicity as a centrality parameter is successful through the collision with the heavy target nuclei. In the collision with the light target nuclei it may be qualitatively better to vote another centrality parameter.

  1. Mesh Quality Improvement Toolkit

    2002-11-15

    MESQUITE is a linkable software library to be used by simulation and mesh generation tools to improve the quality of meshes. Mesh quality is improved by node movement and/or local topological modifications. Various aspects of mesh quality such as smoothness, element shape, size, and orientation are controlled by choosing the appropriate mesh qualtiy metric, and objective function tempate, and a numerical optimization solver to optimize the quality of meshes, MESQUITE uses the TSTT mesh interfacemore » specification to provide an interoperable toolkit that can be used by applications which adopt the standard. A flexible code design makes it easy for meshing researchers to add additional mesh quality metrics, templates, and solvers to develop new quality improvement algorithms by making use of the MESQUITE infrastructure.« less

  2. Hexahedral Mesh Untangling

    SciTech Connect

    KNUPP,PATRICK

    2000-12-13

    We investigate a well-motivated mesh untangling objective function whose optimization automatically produces non-inverted elements when possible. Examples show the procedure is highly effective on simplicial meshes and on non-simplicial (e.g., hexahedral) meshes constructed via mapping or sweeping algorithms. The current whisker-weaving (WW) algorithm in CUBIT usually produces hexahedral meshes that are unsuitable for analyses due to inverted elements. The majority of these meshes cannot be untangled using the new objective function. The most likely source of the difficulty is poor mesh topology.

  3. Mesh Excision: Is Total Mesh Excision Necessary?

    PubMed

    Wolff, Gillian F; Winters, J Christian; Krlin, Ryan M

    2016-04-01

    Nearly 29% of women will undergo a secondary, repeat operation for pelvic organ prolapse (POP) symptom recurrence following a primary repair, as reported by Abbott et al. (Am J Obstet Gynecol 210:163.e1-163.e1, 2014). In efforts to decrease the rates of failure, graft materials have been utilized to augment transvaginal repairs. Following the success of using polypropylene mesh (PPM) for stress urinary incontinence (SUI), the use of PPM in the transvaginal repair of POP increased. However, in recent years, significant concerns have been raised about the safety of PPM mesh. Complications, some specific to mesh, such as exposures, erosion, dyspareunia, and pelvic pain, have been reported with increased frequency. In the current literature, there is not substantive evidence to suggest that PPM has intrinsic properties that warrant total mesh removal in the absence of complications. There are a number of complications that can occur after transvaginal mesh placement that do warrant surgical intervention after failure of conservative therapy. In aggregate, there are no high-quality controlled studies that clearly demonstrate that total mesh removal is consistently more likely to achieve pain reduction. In the cases of obstruction and erosion, it seems clear that definitive removal of the offending mesh is associated with resolution of symptoms in the majority of cases and reasonable practice. There are a number of complications that can occur with removal of mesh, and patients should be informed of this as they formulate a choice of treatment. We will review these considerations as we examine the clinical question of whether total versus partial removal of mesh is necessary for the resolution of complications following transvaginal mesh placement. PMID:26905696

  4. Compact Mesh Generator

    2007-02-02

    The CMG is a small, lightweight, structured mesh generation code. It features a simple text input parser that allows setup of various meshes via a small set of text commands. Mesh generation data can be output to text, the silo file format, or the API can be directly queried by applications. It can run serially or in parallel via MPI. The CMG includes the ability to specify varius initial conditions on a mesh via meshmore » tags.« less

  5. Meshes: The next generation

    SciTech Connect

    Christon, M.; Hardin, D.; Compton, J.; Zosel, M.

    1994-08-29

    Building complex meshes for large-scale numerical simulations presents immense difficulties in exploiting high-performance computers. Industry and research leaders will describe the current state of the art for generating meshes for such large scientific problems. This will be followed by a panel and general audience discussion of the algorithmic and architectural issues surrounding the generation of meshes with10{sup 7} to 10{sup 9} grid points. (Note: The terms ``mesh`` and ``grid`` are used interchangeably in the literature.)

  6. Characterization of the surface properties of Illinois Basin Coals

    SciTech Connect

    Demir, I.

    1991-01-01

    The overall objective of this research project is to provide fundamental data on the physical and chemical surface properties of Illinois coals, specifically those of the Illinois Basin Coal Sample Program (IBCSP). This will help coal researchers achieve an optimal match between Illinois Basin coals and potential coal cleaning and conversion processes (or at least reduce the number of coals suitable for a particular process) and may lead to improved desulfurization and increased utilization of Illinois Basin coals. The specific tasks scheduled to meet our objective are: (1) Physical Characterization: Determine total surface area, porosity, pore size and volume distributions of IBCSP coals crushed to two particle sizes, {minus}100 and {minus}400 mesh (exclusive of IBC-108 which is available only in {minus}400 mesh form), in both an unoxidized and oxidized state. (2) Chemical Characterization: Determine the surface charge (electrokinetic mobility) as a function of pH by electrophoresis and analyze the surface chemical structure of the above samples using Diffuse Reflectance Infrared Spectroscopy (DRIS). (3) Multivariate Statistical Analyses: Explore possible relationships among the newly determined surface properties and other available characterization data, including chemical and petrographic compositions, vitrinite reflectance, free swelling index, ash yield, sulfur forms, and other relevant properties.

  7. Will New Illinois Principal Preparation Programs Fix Illinois Public Schools?

    ERIC Educational Resources Information Center

    VanTuyle, Vicki; Hunt, John W.

    2013-01-01

    In July, 2010 Illinois Governor Pat Quinn signed into law Senate Bill 226 requiring new and more stringent requirements for certification and endorsement of Illinois principals. This Illinois legislation followed other states in adopting widespread educational reform measures aimed at improving student achievement, connecting the responsibility…

  8. Characterization of available coals from Illinois mines. Final technical report, September 1, 1992--August 31, 1993

    SciTech Connect

    Demir, I.; Harvey, R.D.; Ruch, R.R.; Chaven, C.; Damberger, H.H.; Steele, J.D.; Frankie, W.T.

    1993-12-31

    The goal of this project was to characterize available product coals from Illinois mines. The characterization parameters that were determined include the concentration of all trace and minor elements that are of environmental concern, the pyrite size distribution and maceral association, preliminary froth flotation cleanability, slagging and fouling characteristics, chlorine forms and distribution, and certain gasification and rheology parameters. The available trace element data on Illinois coals, mainly on channel samples, was edited and updated with new records. The determinations of the trace and minor elements in 34 collected cleaned coal samples, as well as the proximate and ultimate compositions of 34 samples, were completed. In comparison with the previous channel sample data, the results indicated that the cleaning at existing preparation plants reduced the average concentrations of most of the trace elements in the coals. The data also indicated that the trace element concentrations in the product coals could be reduced further by advanced physical cleaning techniques. A sequential (hot water, dilute ammonia, and dilute sodium hydroxide) extraction procedure on three samples indicated variable chloride reductions. The pyrite cleanability index was determined microscopically for each sample. This index is a relative measure of the ease of pyrite removal from the tested sample. The froth flotation test data on 15 of the samples provided a measure of further cleanability of the product coals by physical fine coal cleaning. Viscosities of the 50% solid and <60 mesh particle size slurries of the same 15 samples revealed that these coals can be pumped in slurry form through a pipeline. Slagging and fouling indices, calculated for all 34 samples, indicated that most of the samples are of low to medium slagging and fouling types. Calculation of the gasification parameters indicated that the Illinois coals are in general amenable to gasification.

  9. Voices for Illinois Children, 1998.

    ERIC Educational Resources Information Center

    Voices for Illinois Children, 1998

    1998-01-01

    This document consists of the three issues of the "Voices for Illinois Children" newsletter published during 1998. Voices for Illinois Children is a child advocacy group that works to make kids "count" in Illinois and to ensure that the basic needs of all children, families, and communities are met. These three newsletter issues explore topics…

  10. Illinois Trustee, 1991-1992.

    ERIC Educational Resources Information Center

    Illinois Trustee, 1992

    1992-01-01

    "Illinois Trustee," the official publication of the Illinois Community College Trustees Association (ICCTA), is distributed to all trustees, chancellors, and presidents, as well as to other persons interested in the public community colleges of Illinois. These five issues of volume 22 include the following articles: (1) "Colleges Receive 1.6%…

  11. Voices for Illinois Children, 1999.

    ERIC Educational Resources Information Center

    Voices for Illinois Children, 1999

    1999-01-01

    This document is comprised of the three "Voices for Illinois Children" newsletter issues published during 1999. Voices for Illinois Children is a child advocacy group that works to make kids "count" in Illinois and to ensure that the basic needs of all children, families, and communities are met. These newsletter issues explore topics pertaining…

  12. Illinois Inventory of Educational Progress. Mathematics Curricular Analyses and Teacher Expectation Results.

    ERIC Educational Resources Information Center

    Illinois State Office of Education, Springfield. Dept. of Planning, Research and Evaluation.

    Curricular analyses, written by experienced teachers and experts, of the 1978 Illinois Inventory of Educational Progress (IIEP) results, and teacher expectations regarding mathematics are presented. A random sample of 7,200 Illinois students within 360 schools (grades 4, 8, 11) were tested; results reflected their educational performance on the…

  13. 75 FR 14436 - Ameren Corporation, Illinois Power Company, Central Illinois Light Company, Central Illinois...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-03-25

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF ENERGY Federal Energy Regulatory Commission Ameren Corporation, Illinois Power Company, Central Illinois Light Company, Central Illinois Public Service Company, Ameren Energy Resources Company, LLC, AmerenEnergy Resources Generating Company; Notice of Filing...

  14. Illinois: Prevention Initiative

    ERIC Educational Resources Information Center

    Center for Law and Social Policy, Inc. (CLASP), 2012

    2012-01-01

    The Illinois Prevention Initiative provides grants to home-based and center-based programs to expand access to the Early Head Start (EHS) model as well as other birth to 3 models. The goal is to serve additional children birth to age 3 and help grantees increase program quality. The initiative to expand access to EHS and other models was…

  15. phdMesh

    2008-01-01

    Parallel Heterogeneous Dynamic unstructured Mesh (phdMesh) data structure library and integration testing code that performs dynamic load balancing of the data structure and parallel geometric proximity search on a contrived test problem. The phdMesh library is intended to be module within a finite element or finite volume library or code. The integration testing code is intended to provide a compact and highly portable performance evaluation code for parallel computing systems.

  16. Gear mesh compliance modeling

    NASA Technical Reports Server (NTRS)

    Savage, M.; Caldwell, R. J.; Wisor, G. D.; Lewicki, D. G.

    1986-01-01

    A computer model has been constructed to simulate the compliance and load sharing in a spur gear mesh. The model adds the effect of rim deflections to previously developed state-of-the-art gear tooth deflection models. The effects of deflections on mesh compliance and load sharing are examined. The model can treat gear meshes composed to two external gears or an external gear driving an internal gear. The model includes deflection contributions from the bending and shear in the teeth, the Hertzian contact deformations, and primary and secondary rotations of the gear rims. The model shows that rimmed gears increase mesh compliance and, in some cases, improve load sharing.

  17. Gear mesh compliance modeling

    NASA Technical Reports Server (NTRS)

    Savage, M.; Caldwell, R. J.; Wisor, G. D.; Lewicki, D. G.

    1987-01-01

    A computer model has been constructed to simulate the compliance and load sharing in a spur gear mesh. The model adds the effect of rim deflections to previously developed state-of-the-art gear tooth deflection models. The effects of deflections on mesh compliance and load sharing are examined. The model can treat gear meshes composed of two external gears or an external gear driving an internal gear. The model includes deflection contributions from the bending and shear in the teeth, the Hertzian contact deformations, and primary and secondary rotations of the gear rims. The model shows that rimmed gears increase mesh compliance and, in some cases, improve load sharing.

  18. Geology of carbonate aggregate resources of Illinois, Illinois mineral notes

    NASA Astrophysics Data System (ADS)

    Goodwin, J. H.

    Carbonate rocks ranging in age from Pennsylvanian through Ordovician provide the principal resources for crushed stone production in Illinois. In the northern third of Illinois, dolomite and calcareous dolomite of the Silurian and Ordovician Systems from the bedrock surface are the basis of a large quarrying industry. One of the largest quarries in the United States wins stone from Silurian reefal dolomite at Thornton, near Chicago. Aggregate for skid-resistant asphalt pavement is produced from Devonian chert in extreme southern Illinois.

  19. Optimization of tetrahedral meshes

    SciTech Connect

    Briere De L`Isle, E.; George, P.L.

    1995-12-31

    Finite element computations are all the more exact if we start from {open_quotes}good{close_quotes} elements. We are interested in meshes where the elements are tetrahedra and we shall develop utilities allowing us to improve the quality of these meshes.

  20. MEDICAL SUBJECTS HEADING (MESH)

    EPA Science Inventory

    MeSH is the National Library of Medicine's controlled vocabulary thesaurus. It consists of sets of terms naming descriptors in a hierarchical structure that permits searching at various levels of specificity. MeSH descriptors are arranged in both an alphabetic and a hierarchical ...

  1. Optimized testing of meshes

    NASA Technical Reports Server (NTRS)

    Malek, Miroslaw; Ozden, Banu

    1990-01-01

    Efficient testing techniques for two-dimensional mesh interconnection networks are presented. The tests cover faults in the arbitration logic of the switches; this includes an examination of fault detection in the data paths, routing, and control circuitry, including the conflict resolution capabilities of mesh interconnection networks using topological test methods. The proposed methods are not implementation specific and can be applied to any design with a mesh topology. The topology and behavior of the network are described and definitions are presented. The fault model is defined and parallel testing methods for the entire network are given.

  2. Terrain-driven unstructured mesh development through semi-automatic vertical feature extraction

    NASA Astrophysics Data System (ADS)

    Bilskie, Matthew V.; Coggin, David; Hagen, Scott C.; Medeiros, Stephen C.

    2015-12-01

    A semi-automated vertical feature terrain extraction algorithm is described and applied to a two-dimensional, depth-integrated, shallow water equation inundation model. The extracted features describe what are commonly sub-mesh scale elevation details (ridge and valleys), which may be ignored in standard practice because adequate mesh resolution cannot be afforded. The extraction algorithm is semi-automated, requires minimal human intervention, and is reproducible. A lidar-derived digital elevation model (DEM) of coastal Mississippi and Alabama serves as the source data for the vertical feature extraction. Unstructured mesh nodes and element edges are aligned to the vertical features and an interpolation algorithm aimed at minimizing topographic elevation error assigns elevations to mesh nodes via the DEM. The end result is a mesh that accurately represents the bare earth surface as derived from lidar with element resolution in the floodplain ranging from 15 m to 200 m. To examine the influence of the inclusion of vertical features on overland flooding, two additional meshes were developed, one without crest elevations of the features and another with vertical features withheld. All three meshes were incorporated into a SWAN+ADCIRC model simulation of Hurricane Katrina. Each of the three models resulted in similar validation statistics when compared to observed time-series water levels at gages and post-storm collected high water marks. Simulated water level peaks yielded an R2 of 0.97 and upper and lower 95% confidence interval of ∼ ± 0.60 m. From the validation at the gages and HWM locations, it was not clear which of the three model experiments performed best in terms of accuracy. Examination of inundation extent among the three model results were compared to debris lines derived from NOAA post-event aerial imagery, and the mesh including vertical features showed higher accuracy. The comparison of model results to debris lines demonstrates that additional

  3. Mesh implants: An overview of crucial mesh parameters

    PubMed Central

    Zhu, Lei-Ming; Schuster, Philipp; Klinge, Uwe

    2015-01-01

    Hernia repair is one of the most frequently performed surgical interventions that use mesh implants. This article evaluates crucial mesh parameters to facilitate selection of the most appropriate mesh implant, considering raw materials, mesh composition, structure parameters and mechanical parameters. A literature review was performed using the PubMed database. The most important mesh parameters in the selection of a mesh implant are the raw material, structural parameters and mechanical parameters, which should match the physiological conditions. The structural parameters, especially the porosity, are the most important predictors of the biocompatibility performance of synthetic meshes. Meshes with large pores exhibit less inflammatory infiltrate, connective tissue and scar bridging, which allows increased soft tissue ingrowth. The raw material and combination of raw materials of the used mesh, including potential coatings and textile design, strongly impact the inflammatory reaction to the mesh. Synthetic meshes made from innovative polymers combined with surface coating have been demonstrated to exhibit advantageous behavior in specialized fields. Monofilament, large-pore synthetic meshes exhibit advantages. The value of mesh classification based on mesh weight seems to be overestimated. Mechanical properties of meshes, such as anisotropy/isotropy, elasticity and tensile strength, are crucial parameters for predicting mesh performance after implantation. PMID:26523210

  4. Urogynecologic Surgical Mesh Implants

    MedlinePlus

    ... Boston Scientific's urogynecologic surgical mesh may contain counterfeit raw material. We are examining these allegations to determine any ... are currently not aware that the alleged counterfeit raw material contributes to adverse events associated with these products. ...

  5. Illinois, An Educational Step Backward.

    ERIC Educational Resources Information Center

    Jones, Scott

    Conclusions reached by the Illinois State Board of Education Study, released in May 1985, that small schools are inferior and inefficient, that Illinois has too many schools, and that over half its schools should be closed seem to be an educational step backward. Without linking the two concepts, the study implies that school consolidation will…

  6. School Tort Law in Illinois.

    ERIC Educational Resources Information Center

    Menacker, Julius

    1990-01-01

    Illinois tort policy has swung from supporting the sovereign immunity of school districts, to completely striking down sovereign immunity, to narrowing conditions in which districts and employees could be liable. Advises Illinois and other states with similar problems to develop legislation and court precedents to reduce the complexity of tort…

  7. Illinois State Scholarship Commission Report.

    ERIC Educational Resources Information Center

    Illinois State Scholarship Commission, Deerfield.

    The Illinois State Scholarship Commission (ISSC) is responsible for the administration of 9 state authorized and funded financial aid programs for Illinois postsecondary students. The major programs consist of: (1) nonrepayable monetary awards, and (2) guaranteed educational loans. The purposes of the Commission's programs are to: (1) equalize…

  8. Longwall mining in Illinois

    SciTech Connect

    Conroy, P.J.; Curth, E.A.

    1981-01-01

    The use of shields has been a major factor contributing to adequate roof control in Illinois. Short spans of exposed roof, quickly applied support, stability of structure, and full shelter for face crews are some of the significant advantages that led to the adoption of shields. The successful application of shields that were designed to sustain high yield loads resulting in a mean load density of 862.2 KN/m/sup 2/ (9 tons/ft/sup 2/) has encouraged the growth of longwall mining in the Illinois coal basin from one face to six in less than 4 years. Double-drum shearers of 1.5 x 10/sup 8/ kg/m (400 hp), using 995-volt power, with chainless haulage and high capacity face conveyors and stage loaders are standard face equipment. New coal mines are being developed for longwall mining with panel blocks as large as limiting factors allow. They are projected to have two active longwall faces and as many continuous miner units as are required for development and extraction.

  9. Unstructured mesh generation and adaptivity

    NASA Technical Reports Server (NTRS)

    Mavriplis, D. J.

    1995-01-01

    An overview of current unstructured mesh generation and adaptivity techniques is given. Basic building blocks taken from the field of computational geometry are first described. Various practical mesh generation techniques based on these algorithms are then constructed and illustrated with examples. Issues of adaptive meshing and stretched mesh generation for anisotropic problems are treated in subsequent sections. The presentation is organized in an education manner, for readers familiar with computational fluid dynamics, wishing to learn more about current unstructured mesh techniques.

  10. Geologic characteristics of the central stretch of the Ticona Channel, north-central Illinois

    USGS Publications Warehouse

    Willems, B.A.; Malone, D.H.; Pugin, A.

    2007-01-01

    The Ticona Channel is located in north-central Illinois and occurs in Grundy, LaSalle, and Putnam counties. It is a buried bedrock valley that served as the principal paleodrainage system in north-central Illinois during the Illinoian and pre-Illinoian. This study focused on the part of the Ticona Channel within the Leonore 7.5??? Quadrangle. The geometry and stratigraphy of sediments that fill the Ticona Channel were investigated using high-resolution, shallow seismic reflection profiling, traditional field geologic mapping techniques, borehole data, and water-well-log data. The valley is about 2 km (1 mi) wide and approximately 60 m (200 ft) deep. The U-shape channel is straight, trends east-west, and has only one mappable tributary. The valley is carved into the Pennsylvanian Carbondale Formation in the eastern part of the study area; it has incised into the Ordovician Prairie du Chien Group in the west. At its base, the Ticona Channel is filled with the Pearl Formation, which is coarse-grained sand and gravel that was deposited during the Illinoian glaciation. The Pearl Formation is overlain by Illinoian till of the Glasford Formation and is capped by Wedron Group sediments from the Wisconsinan stage. Copyright ?? 2007. The American Association of Petroleum Geologists/Division of Environmental Geosciences. All rights reserved.

  11. Cosmology on a Mesh

    NASA Astrophysics Data System (ADS)

    Gill, Stuart P. D.; Knebe, Alexander; Gibson, Brad K.; Flynn, Chris; Ibata, Rodrigo A.; Lewis, Geraint F.

    2003-04-01

    An adaptive multi grid approach to simulating the formation of structure from collisionless dark matter is described. MLAPM (Multi-Level Adaptive Particle Mesh) is one of the most efficient serial codes available on the cosmological "market" today. As part of Swinburne University's role in the development of the Square Kilometer Array, we are implementing hydrodynamics, feedback, and radiative transfer within the MLAPM adaptive mesh, in order to simulate baryonic processes relevant to the interstellar and intergalactic media at high redshift. We will outline our progress to date in applying the existing MLAPM to a study of the decay of satellite galaxies within massive host potentials.

  12. Documentation for MeshKit - Reactor Geometry (&mesh) Generator

    SciTech Connect

    Jain, Rajeev; Mahadevan, Vijay

    2015-09-30

    This report gives documentation for using MeshKit’s Reactor Geometry (and mesh) Generator (RGG) GUI and also briefly documents other algorithms and tools available in MeshKit. RGG is a program designed to aid in modeling and meshing of complex/large hexagonal and rectilinear reactor cores. RGG uses Argonne’s SIGMA interfaces, Qt and VTK to produce an intuitive user interface. By integrating a 3D view of the reactor with the meshing tools and combining them into one user interface, RGG streamlines the task of preparing a simulation mesh and enables real-time feedback that reduces accidental scripting mistakes that could waste hours of meshing. RGG interfaces with MeshKit tools to consolidate the meshing process, meaning that going from model to mesh is as easy as a button click. This report is designed to explain RGG v 2.0 interface and provide users with the knowledge and skills to pilot RGG successfully. Brief documentation of MeshKit source code, tools and other algorithms available are also presented for developers to extend and add new algorithms to MeshKit. RGG tools work in serial and parallel and have been used to model complex reactor core models consisting of conical pins, load pads, several thousands of axially varying material properties of instrumentation pins and other interstices meshes.

  13. Geometric approaches to mesh generation

    SciTech Connect

    Hoffmann, C.M.

    1995-12-31

    We review three approaches to mesh generation that axe based on analyzing and accounting for the geometric structure of the domain. In the first approach, due to Armstrong, the domain is partitioned into subdomains based on the medial-axis transform, a tool for analyzing spatial structures. In the second approach, due to Cox, the design history defines a geometric structure of the domain. The design primitives of that structure are meshed separately, and mesh overlap is accounted for by coupling equations. The third approach argues that mesh generation ought to be integrated into the shape design process, by meshing design features separately and resolving overlapping meshes by standard geometric computations.

  14. Curved mesh generation and mesh refinement using Lagrangian solid mechanics

    SciTech Connect

    Persson, P.-O.; Peraire, J.

    2008-12-31

    We propose a method for generating well-shaped curved unstructured meshes using a nonlinear elasticity analogy. The geometry of the domain to be meshed is represented as an elastic solid. The undeformed geometry is the initial mesh of linear triangular or tetrahedral elements. The external loading results from prescribing a boundary displacement to be that of the curved geometry, and the final configuration is determined by solving for the equilibrium configuration. The deformations are represented using piecewise polynomials within each element of the original mesh. When the mesh is sufficiently fine to resolve the solid deformation, this method guarantees non-intersecting elements even for highly distorted or anisotropic initial meshes. We describe the method and the solution procedures, and we show a number of examples of two and three dimensional simplex meshes with curved boundaries. We also demonstrate how to use the technique for local refinement of non-curved meshes in the presence of curved boundaries.

  15. Olive School, Arlington Heights, Illinois

    ERIC Educational Resources Information Center

    Rausch, Kathy

    1974-01-01

    Article stressed the need for a music teacher in an open school to have an openness to people and ideas. It also described the educational objectives at the Olive School in Arlington Heights, Illinois. (Author/RK)

  16. Illinois solid waste management legislation

    SciTech Connect

    1999-07-01

    Contents include: Degradable Plastic Act; Energy Assistance Act of 1989; Hazardous and Solid Waste Recycling and Treatment Act; Household Hazardous Waste Collection Program Act; Illinois Emergency Planning and Community Right to Know Act; Illinois Environmental Facilities Financing Act; Illinois Procurement Code; Illinois Solid Waste Management Act; Intergovernmental Cooperation Act; Junkyard Act; Litter Control Act; Local Solid Waste Disposal Act; Metro East Solid Waste Disposal and Energy Producing Service Act; Recycled Newsprint Use Act; Responsible Property Transfer Act of 1988; Solid Waste Disposal District Act; Solid Waste Planning and Recycling Act; Solid Waste Site Operator Certification Law; Township Refuse Collection and Disposal Act; Toxic Pollution Prevention Act; Used Motor Oil Recycling Act; Waste Oil Recovery Act; and Water Supply, Drainage and Flood Control Act.

  17. Advanced numerical methods in mesh generation and mesh adaptation

    SciTech Connect

    Lipnikov, Konstantine; Danilov, A; Vassilevski, Y; Agonzal, A

    2010-01-01

    Numerical solution of partial differential equations requires appropriate meshes, efficient solvers and robust and reliable error estimates. Generation of high-quality meshes for complex engineering models is a non-trivial task. This task is made more difficult when the mesh has to be adapted to a problem solution. This article is focused on a synergistic approach to the mesh generation and mesh adaptation, where best properties of various mesh generation methods are combined to build efficiently simplicial meshes. First, the advancing front technique (AFT) is combined with the incremental Delaunay triangulation (DT) to build an initial mesh. Second, the metric-based mesh adaptation (MBA) method is employed to improve quality of the generated mesh and/or to adapt it to a problem solution. We demonstrate with numerical experiments that combination of all three methods is required for robust meshing of complex engineering models. The key to successful mesh generation is the high-quality of the triangles in the initial front. We use a black-box technique to improve surface meshes exported from an unattainable CAD system. The initial surface mesh is refined into a shape-regular triangulation which approximates the boundary with the same accuracy as the CAD mesh. The DT method adds robustness to the AFT. The resulting mesh is topologically correct but may contain a few slivers. The MBA uses seven local operations to modify the mesh topology. It improves significantly the mesh quality. The MBA method is also used to adapt the mesh to a problem solution to minimize computational resources required for solving the problem. The MBA has a solid theoretical background. In the first two experiments, we consider the convection-diffusion and elasticity problems. We demonstrate the optimal reduction rate of the discretization error on a sequence of adaptive strongly anisotropic meshes. The key element of the MBA method is construction of a tensor metric from hierarchical edge

  18. Application of Quaternions for Mesh

    NASA Technical Reports Server (NTRS)

    Samareh, Jamshid A.

    2002-01-01

    A new three dimensional mesh deformation algorithm, based on quaternion algebra, is introduced. A brief overview of quaternion algebra is provided, along with some preliminary results for two-dimensional structured and unstructured viscous mesh deformation.

  19. Multigrid Methods for Mesh Relaxation

    SciTech Connect

    O'Brien, M J

    2006-06-12

    When generating a mesh for the initial conditions for a computer simulation, you want the mesh to be as smooth as possible. A common practice is to use equipotential mesh relaxation to smooth out a distorted computational mesh. Typically a Laplace-like equation is set up for the mesh coordinates and then one or more Jacobi iterations are performed to relax the mesh. As the zone count gets really large, the Jacobi iteration becomes less and less effective and we are stuck with our original unrelaxed mesh. This type of iteration can only damp high frequency errors and the smooth errors remain. When the zone count is large, almost everything looks smooth so relaxation cannot solve the problem. In this paper we examine a multigrid technique which effectively smooths out the mesh, independent of the number of zones.

  20. Toward An Unstructured Mesh Database

    NASA Astrophysics Data System (ADS)

    Rezaei Mahdiraji, Alireza; Baumann, Peter Peter

    2014-05-01

    Unstructured meshes are used in several application domains such as earth sciences (e.g., seismology), medicine, oceanography, cli- mate modeling, GIS as approximate representations of physical objects. Meshes subdivide a domain into smaller geometric elements (called cells) which are glued together by incidence relationships. The subdivision of a domain allows computational manipulation of complicated physical structures. For instance, seismologists model earthquakes using elastic wave propagation solvers on hexahedral meshes. The hexahedral con- tains several hundred millions of grid points and millions of hexahedral cells. Each vertex node in the hexahedrals stores a multitude of data fields. To run simulation on such meshes, one needs to iterate over all the cells, iterate over incident cells to a given cell, retrieve coordinates of cells, assign data values to cells, etc. Although meshes are used in many application domains, to the best of our knowledge there is no database vendor that support unstructured mesh features. Currently, the main tool for querying and manipulating unstructured meshes are mesh libraries, e.g., CGAL and GRAL. Mesh li- braries are dedicated libraries which includes mesh algorithms and can be run on mesh representations. The libraries do not scale with dataset size, do not have declarative query language, and need deep C++ knowledge for query implementations. Furthermore, due to high coupling between the implementations and input file structure, the implementations are less reusable and costly to maintain. A dedicated mesh database offers the following advantages: 1) declarative querying, 2) ease of maintenance, 3) hiding mesh storage structure from applications, and 4) transparent query optimization. To design a mesh database, the first challenge is to define a suitable generic data model for unstructured meshes. We proposed ImG-Complexes data model as a generic topological mesh data model which extends incidence graph model to multi

  1. Surgical mesh for ventral incisional hernia repairs: Understanding mesh design.

    PubMed

    Rastegarpour, Ali; Cheung, Michael; Vardhan, Madhurima; Ibrahim, Mohamed M; Butler, Charles E; Levinson, Howard

    2016-01-01

    Surgical mesh has become an indispensable tool in hernia repair to improve outcomes and reduce costs; however, efforts are constantly being undertaken in mesh development to overcome postoperative complications. Common complications include infection, pain, adhesions, mesh extrusion and hernia recurrence. Reducing the complications of mesh implantation is of utmost importance given that hernias occur in hundreds of thousands of patients per year in the United States. In the present review, the authors present the different types of hernia meshes, discuss the key properties of mesh design, and demonstrate how each design element affects performance and complications. The present article will provide a basis for surgeons to understand which mesh to choose for patient care and why, and will explain the important technological aspects that will continue to evolve over the ensuing years. PMID:27054138

  2. Recommending MeSH terms for annotating biomedical articles

    PubMed Central

    Huang, Minlie; Névéol, Aurélie

    2011-01-01

    Background Due to the high cost of manual curation of key aspects from the scientific literature, automated methods for assisting this process are greatly desired. Here, we report a novel approach to facilitate MeSH indexing, a challenging task of assigning MeSH terms to MEDLINE citations for their archiving and retrieval. Methods Unlike previous methods for automatic MeSH term assignment, we reformulate the indexing task as a ranking problem such that relevant MeSH headings are ranked higher than those irrelevant ones. Specifically, for each document we retrieve 20 neighbor documents, obtain a list of MeSH main headings from neighbors, and rank the MeSH main headings using ListNet–a learning-to-rank algorithm. We trained our algorithm on 200 documents and tested on a previously used benchmark set of 200 documents and a larger dataset of 1000 documents. Results Tested on the benchmark dataset, our method achieved a precision of 0.390, recall of 0.712, and mean average precision (MAP) of 0.626. In comparison to the state of the art, we observe statistically significant improvements as large as 39% in MAP (p-value <0.001). Similar significant improvements were also obtained on the larger document set. Conclusion Experimental results show that our approach makes the most accurate MeSH predictions to date, which suggests its great potential in making a practical impact on MeSH indexing. Furthermore, as discussed the proposed learning framework is robust and can be adapted to many other similar tasks beyond MeSH indexing in the biomedical domain. All data sets are available at: http://www.ncbi.nlm.nih.gov/CBBresearch/Lu/indexing. PMID:21613640

  3. Mesh2d

    SciTech Connect

    Greg Flach, Frank Smith

    2011-12-31

    Mesh2d is a Fortran90 program designed to generate two-dimensional structured grids of the form [x(i),y(i,j)] where [x,y] are grid coordinates identified by indices (i,j). The x(i) coordinates alone can be used to specify a one-dimensional grid. Because the x-coordinates vary only with the i index, a two-dimensional grid is composed in part of straight vertical lines. However, the nominally horizontal y(i,j0) coordinates along index i are permitted to undulate or otherwise vary. Mesh2d also assigns an integer material type to each grid cell, mtyp(i,j), in a user-specified manner. The complete grid is specified through three separate input files defining the x(i), y(i,j), and mtyp(i,j) variations.

  4. Mesh2d

    2011-12-31

    Mesh2d is a Fortran90 program designed to generate two-dimensional structured grids of the form [x(i),y(i,j)] where [x,y] are grid coordinates identified by indices (i,j). The x(i) coordinates alone can be used to specify a one-dimensional grid. Because the x-coordinates vary only with the i index, a two-dimensional grid is composed in part of straight vertical lines. However, the nominally horizontal y(i,j0) coordinates along index i are permitted to undulate or otherwise vary. Mesh2d also assignsmore » an integer material type to each grid cell, mtyp(i,j), in a user-specified manner. The complete grid is specified through three separate input files defining the x(i), y(i,j), and mtyp(i,j) variations.« less

  5. SUPERIMPOSED MESH PLOTTING IN MCNP

    SciTech Connect

    J. HENDRICKS

    2001-02-01

    The capability to plot superimposed meshes has been added to MCNP{trademark}. MCNP4C featured a superimposed mesh weight window generator which enabled users to set up geometries without having to subdivide geometric cells for variance reduction. The variance reduction was performed with weight windows on a rectangular or cylindrical mesh superimposed over the physical geometry. Experience with the new capability was favorable but also indicated that a number of enhancements would be very beneficial, particularly a means of visualizing the mesh and its values. The mathematics for plotting the mesh and its values is described here along with a description of other upgrades.

  6. Particle-mesh techniques

    NASA Technical Reports Server (NTRS)

    Macneice, Peter

    1995-01-01

    This is an introduction to numerical Particle-Mesh techniques, which are commonly used to model plasmas, gravitational N-body systems, and both compressible and incompressible fluids. The theory behind this approach is presented, and its practical implementation, both for serial and parallel machines, is discussed. This document is based on a four-hour lecture course presented by the author at the NASA Summer School for High Performance Computational Physics, held at Goddard Space Flight Center.

  7. Parallel Adaptive Mesh Refinement

    SciTech Connect

    Diachin, L; Hornung, R; Plassmann, P; WIssink, A

    2005-03-04

    As large-scale, parallel computers have become more widely available and numerical models and algorithms have advanced, the range of physical phenomena that can be simulated has expanded dramatically. Many important science and engineering problems exhibit solutions with localized behavior where highly-detailed salient features or large gradients appear in certain regions which are separated by much larger regions where the solution is smooth. Examples include chemically-reacting flows with radiative heat transfer, high Reynolds number flows interacting with solid objects, and combustion problems where the flame front is essentially a two-dimensional sheet occupying a small part of a three-dimensional domain. Modeling such problems numerically requires approximating the governing partial differential equations on a discrete domain, or grid. Grid spacing is an important factor in determining the accuracy and cost of a computation. A fine grid may be needed to resolve key local features while a much coarser grid may suffice elsewhere. Employing a fine grid everywhere may be inefficient at best and, at worst, may make an adequately resolved simulation impractical. Moreover, the location and resolution of fine grid required for an accurate solution is a dynamic property of a problem's transient features and may not be known a priori. Adaptive mesh refinement (AMR) is a technique that can be used with both structured and unstructured meshes to adjust local grid spacing dynamically to capture solution features with an appropriate degree of resolution. Thus, computational resources can be focused where and when they are needed most to efficiently achieve an accurate solution without incurring the cost of a globally-fine grid. Figure 1.1 shows two example computations using AMR; on the left is a structured mesh calculation of a impulsively-sheared contact surface and on the right is the fuselage and volume discretization of an RAH-66 Comanche helicopter [35]. Note the

  8. Characterization of the surface properties of Illinois Basin Coals. Technical report, September 1--November 30, 1991

    SciTech Connect

    Demir, I.

    1991-12-31

    The overall objective of this research project is to provide fundamental data on the physical and chemical surface properties of Illinois coals, specifically those of the Illinois Basin Coal Sample Program (IBCSP). This will help coal researchers achieve an optimal match between Illinois Basin coals and potential coal cleaning and conversion processes (or at least reduce the number of coals suitable for a particular process) and may lead to improved desulfurization and increased utilization of Illinois Basin coals. The specific tasks scheduled to meet our objective are: (1) Physical Characterization: Determine total surface area, porosity, pore size and volume distributions of IBCSP coals crushed to two particle sizes, {minus}100 and {minus}400 mesh (exclusive of IBC-108 which is available only in {minus}400 mesh form), in both an unoxidized and oxidized state. (2) Chemical Characterization: Determine the surface charge (electrokinetic mobility) as a function of pH by electrophoresis and analyze the surface chemical structure of the above samples using Diffuse Reflectance Infrared Spectroscopy (DRIS). (3) Multivariate Statistical Analyses: Explore possible relationships among the newly determined surface properties and other available characterization data, including chemical and petrographic compositions, vitrinite reflectance, free swelling index, ash yield, sulfur forms, and other relevant properties.

  9. On Optimal Bilinear Quadrilateral Meshes

    SciTech Connect

    D'Azevedo, E.

    1998-10-26

    The novelty of this work is in presenting interesting error properties of two types of asymptotically optimal quadrilateral meshes for bilinear approximation. The first type of mesh has an error equidistributing property where the maximum interpolation error is asymptotically the same over all elements. The second type has faster than expected super-convergence property for certain saddle-shaped data functions. The super-convergent mesh may be an order of magnitude more accurate than the error equidistributing mesh. Both types of mesh are generated by a coordinate transformation of a regular mesh of squares. The coordinate transformation is derived by interpreting the Hessian matrix of a data function as a metric tensor. The insights in this work may have application in mesh design near known corner or point singularities.

  10. On Optimal Bilinear Quadrilateral Meshes

    SciTech Connect

    D'Azevedo, E

    2000-03-17

    The novelty of this work is in presenting interesting error properties of two types of asymptotically ''optimal'' quadrilateral meshes for bilinear approximation. The first type of mesh has an error equidistributing property where the maximum interpolation error is asymptotically the same over all elements. The second type has faster than expected ''super-convergence'' property for certain saddle-shaped data functions. The ''superconvergent'' mesh may be an order of magnitude more accurate than the error equidistributing mesh. Both types of mesh are generated by a coordinate transformation of a regular mesh of squares. The coordinate transformation is derived by interpreting the Hessian matrix of a data function as a metric tensor. The insights in this work may have application in mesh design near corner or point singularities.

  11. Mesh Algorithms for PDE with Sieve I: Mesh Distribution

    DOE PAGESBeta

    Knepley, Matthew G.; Karpeev, Dmitry A.

    2009-01-01

    We have developed a new programming framework, called Sieve, to support parallel numerical partial differential equation(s) (PDE) algorithms operating over distributed meshes. We have also developed a reference implementation of Sieve in C++ as a library of generic algorithms operating on distributed containers conforming to the Sieve interface. Sieve makes instances of the incidence relation, or arrows, the conceptual first-class objects represented in the containers. Further, generic algorithms acting on this arrow container are systematically used to provide natural geometric operations on the topology and also, through duality, on the data. Finally, coverings and duality are used to encode notmore » only individual meshes, but all types of hierarchies underlying PDE data structures, including multigrid and mesh partitions. In order to demonstrate the usefulness of the framework, we show how the mesh partition data can be represented and manipulated using the same fundamental mechanisms used to represent meshes. We present the complete description of an algorithm to encode a mesh partition and then distribute a mesh, which is independent of the mesh dimension, element shape, or embedding. Moreover, data associated with the mesh can be similarly distributed with exactly the same algorithm. The use of a high level of abstraction within the Sieve leads to several benefits in terms of code reuse, simplicity, and extensibility. We discuss these benefits and compare our approach to other existing mesh libraries.« less

  12. Mesh Oriented datABase

    SciTech Connect

    Tautges, Timothy J.

    2004-04-01

    MOAB is a component for representing and evaluating mesh data. MOAB can store stuctured and unstructured mesh, consisting of elements in the finite element "zoo". The functional interface to MOAB is simple yet powerful, allowing the representation of many types of metadata commonly found on the mesh. MOAB is optimized for efficiency in space and time, based on access to mesh in chunks rather than through individual entities, while also versatile enough to support individual entity access. The MOAB data model consists of a mesh interface instance, mesh entities (vertices and elements), sets, and tags. Entities are addressed through handles rather than pointers, to allow the underlying representation of an entity to change without changing the handle to that entity. Sets are arbitrary groupings of mesh entities and other sets. Sets also support parent/child relationships as a relation distinct from sets containing other sets. The directed-graph provided by set parent/child relationships is useful for modeling topological relations from a geometric model or other metadata. Tags are named data which can be assigned to the mesh as a whole, individual entities, or sets. Tags are a mechanism for attaching data to individual entities and sets are a mechanism for describing relations between entities; the combination of these two mechanisms isa powerful yet simple interface for representing metadata or application-specific data. For example, sets and tags can be used together to describe geometric topology, boundary condition, and inter-processor interface groupings in a mesh. MOAB is used in several ways in various applications. MOAB serves as the underlying mesh data representation in the VERDE mesh verification code. MOAB can also be used as a mesh input mechanism, using mesh readers induded with MOAB, or as a t’anslator between mesh formats, using readers and writers included with MOAB.

  13. Mesh Oriented datABase

    2004-04-01

    MOAB is a component for representing and evaluating mesh data. MOAB can store stuctured and unstructured mesh, consisting of elements in the finite element "zoo". The functional interface to MOAB is simple yet powerful, allowing the representation of many types of metadata commonly found on the mesh. MOAB is optimized for efficiency in space and time, based on access to mesh in chunks rather than through individual entities, while also versatile enough to support individualmore » entity access. The MOAB data model consists of a mesh interface instance, mesh entities (vertices and elements), sets, and tags. Entities are addressed through handles rather than pointers, to allow the underlying representation of an entity to change without changing the handle to that entity. Sets are arbitrary groupings of mesh entities and other sets. Sets also support parent/child relationships as a relation distinct from sets containing other sets. The directed-graph provided by set parent/child relationships is useful for modeling topological relations from a geometric model or other metadata. Tags are named data which can be assigned to the mesh as a whole, individual entities, or sets. Tags are a mechanism for attaching data to individual entities and sets are a mechanism for describing relations between entities; the combination of these two mechanisms isa powerful yet simple interface for representing metadata or application-specific data. For example, sets and tags can be used together to describe geometric topology, boundary condition, and inter-processor interface groupings in a mesh. MOAB is used in several ways in various applications. MOAB serves as the underlying mesh data representation in the VERDE mesh verification code. MOAB can also be used as a mesh input mechanism, using mesh readers induded with MOAB, or as a t’anslator between mesh formats, using readers and writers included with MOAB.« less

  14. Lithospheric structure of the Illinois Basin from teleseismic P-wave tomography

    NASA Astrophysics Data System (ADS)

    Wilson, B.; Gilbert, H. J.; Hamburger, M. W.; Merrell, T.; Pavlis, G. L.; Sherrill, E.

    2013-12-01

    We examine heterogeneity of the crust and upper mantle associated with a major intracratonic basin, using arrival time data from a regional EarthScope experiment extending across the western margin of the Illinois Basin. We measured 24,062 P-wave residuals associated with 399 teleseismic events recorded from January 2012 to March 2013 by 122 stations in the Illinois Basin region. We used data from the Ozark Illinois INdiana Kentucky (OIINK) Flexible Array, the permanent New Madrid Seismic Network, and a portion of the Earthscope Transportable Array. Precise relative arrival times were determined using array cross-correlation methods. We plotted the measured arrivals as residual maps to identify first order patterns of velocity heterogeneity and to fix outliers. These data were then inverted for P-wave velocity using non-linear tomography code developed by Steven Roecker. Our preliminary results indicate the upper 200 km of the mantle can be characterized by two blocks with a transition zone centered roughly parallel to the Ohio River boundary of Illinois and Kentucky. Estimated P-wave velocities are higher in Kentucky, located southeast of the transition zone compared to Missouri and Illinois, located northwest. We caution that at this stage our tomography model may be biased as we have not accounted for variations in crustal structure or applied corrections associated with the Illinois Basin. Parallel work with receiver functions by our group and the known geometry of the Illinois Basin will be used to calculate these corrections and modify the tomographic model accordingly.

  15. Visualizations of Illinois Educational Data

    NASA Astrophysics Data System (ADS)

    Stevens, Cacey; Marder, Michael; Nagel, Sidney

    2015-03-01

    We examine data from scores on standardized exams taken by students in the state of Illinois. In order to analyze the factors affecting school performance in mathematics, we represent the data through visualizations, an approach commonly used to identify patterns in studies of physical systems. Exam scores for different schools are shown to depend on program type, location, and poverty concentration. For most schools in Illinois, test scores decline linearly with increased poverty concentration. However schools in Chicago show deviations from the linear trend. For any given poverty level, schools in Chicago perform better than those in other communities of Illinois. We also compare different school types, such as neighborhood, magnet, and charter programs, at each grade level. The city's selective enrollment programs show notably superior achievement at the high school level. This is less pronounced at earlier grades.

  16. Selective laser vaporization of polypropylene sutures and mesh

    NASA Astrophysics Data System (ADS)

    Burks, David; Rosenbury, Sarah B.; Kennelly, Michael J.; Fried, Nathaniel M.

    2012-02-01

    Complications from polypropylene mesh after surgery for female stress urinary incontinence (SUI) may require tedious surgical revision and removal of mesh materials with risk of damage to healthy adjacent tissue. This study explores selective laser vaporization of polypropylene suture/mesh materials commonly used in SUI. A compact, 7 Watt, 647-nm, red diode laser was operated with a radiant exposure of 81 J/cm2, pulse duration of 100 ms, and 1.0-mm-diameter laser spot. The 647-nm wavelength was selected because its absorption by water, hemoglobin, and other major tissue chromophores is low, while polypropylene absorption is high. Laser vaporization of ~200-μm-diameter polypropylene suture/mesh strands, in contact with fresh urinary tissue samples, ex vivo, was performed. Non-contact temperature mapping of the suture/mesh samples with a thermal camera was also conducted. Photoselective vaporization of polypropylene suture and mesh using a single laser pulse was achieved with peak temperatures of 180 and 232 °C, respectively. In control (safety) studies, direct laser irradiation of tissue alone resulted in only a 1 °C temperature increase. Selective laser vaporization of polypropylene suture/mesh materials is feasible without significant thermal damage to tissue. This technique may be useful for SUI procedures requiring surgical revision.

  17. Illinois Higher Education Annual Report, 2003.

    ERIC Educational Resources Information Center

    Kaplan, James L.; LaVista, Daniel J.

    This report presents information about the Illinois Board of Higher Education and the state of higher education in Illinois. The Illinois Board of Higher Education, a 15-member board, is responsible for planning and coordinating the states system of higher education. The Board has statutory responsibilities for master planning, the budget, program…

  18. Illinois Early Childhood Program Expanded Matrix, 2001.

    ERIC Educational Resources Information Center

    Illinois State Dept. of Human Services, East St. Louis. Head Start State Collaboration Office.

    This matrix provides information on eight early childhood programs offered in Illinois. Presented in grid form, the information can be compared across programs. The programs described are: (1) Head Start and Early Head Start; (2) Illinois Department of Children and Family Services child care; (3) Illinois Department of Human Services child care;…

  19. Exemplary Reading Programs in Illinois Public Schools.

    ERIC Educational Resources Information Center

    Foertsch, Mary

    A study was conducted in response to a request from the Illinois State Board of Education to examine closely which reading programs work best for Illinois students and schools. In some Illinois schools, students exhibit consistently high levels of reading achievement--the teaching, learning, and other practices of these schools may point the way…

  20. Illinois Statewide Facilitator Center. Final Performance Report.

    ERIC Educational Resources Information Center

    Illinois Statewide Facilitator Center, Metropolis.

    This report summarizes the activities of the Illinois Statewide Facilitator Center for fiscal year 1979. The Facilitator Center is the Illinois link in the National Diffusion Network (NDN) and assists educators in Illinois by providing improved educational opportunities through surveying school needs within the state and reviewing exemplary…

  1. Defense Contracting and Vocational Education in Illinois.

    ERIC Educational Resources Information Center

    Kjos, Diane; And Others

    A study examined the relationship between defense contracting and vocational education in Illinois. During the study, researchers analyzed data from a variety of national and Illinois state data sources, including the Department of Defense, the Bureau of Labor Statistics, the Illinois Department of Commerce and Community Affairs, the Research and…

  2. Illinois Occupational Skill Standards: Plastics Molding Cluster.

    ERIC Educational Resources Information Center

    Illinois Occupational Skill Standards and Credentialing Council, Carbondale.

    This document, which is intended to serve as a guide for work force preparation program providers, details the Illinois occupational skill standards for programs preparing students for employment in jobs in the plastics molding industry. Agency partners involved in this project include: the Illinois State Board of Education, Illinois Community…

  3. Green Approach to the Fabrication of Superhydrophobic Mesh Surface for Oil/Water Separation.

    PubMed

    Wang, Fajun; Lei, Sheng; Xu, Yao; Ou, Junfei

    2015-07-20

    We report a simple and environment friendly method to fabricate superhydrophobic metallic mesh surfaces for oil/water separation. The obtained mesh surface exhibits superhydrophobicity and superoleophilicity after it was dried in an oven at 200 °C for 10 min. A rough silver layer is formed on the mesh surface after immersion, and the spontaneous adsorption of airborne carbon contaminants on the silver surface lower the surface free energy of the mesh. No low-surface-energy reagents and/or volatile organic solvents are used. In addition, we demonstrate that by using the mesh box, oils can be separated and collected from the surface of water repeatedly, and that high separation efficiencies of larger than 92 % are retained for various oils. Moreover, the superhydrophobic mesh also possesses excellent corrosion resistance and thermal stability. Hence, these superhydrophobic meshes might be good candidates for the practical separation of oil from the surface of water. PMID:26017675

  4. Production of Illinois base compliance coal using enhanced gravity separation. Technical report, March 1, 1994--May 31, 1994

    SciTech Connect

    Paul, B.C.; Honaker, R.Q.

    1994-09-01

    It is well known that froth flotation is inefficient for treating fine coal fractions containing a significant portion of middling particles. On the other hand, gravity-based processes can effectively remove middling particles containing only a small amount of coal. Falcon Concentrators Inc. and Knelson Gold Concentrators Inc. have developed full-scale, enhanced gravity separators for the treatment of heavy minerals. This project is evaluating the potential of using these concentrators to treat Illinois Basin coal fines. During this reporting period, -28 mesh run-of-mine Illinois No. 5 and No. 6 coal samples were processed using a continuous Falcon concentrator having a 10-inch bowl diameter. For the Illinois No. 5 coal sample, the ash content was reduced in the 100 {times} 325 mesh size fraction from about 18% to 8% while achieving a high combustible recovery value of nearly 97%. In addition, the total sulfur content was substantially decreased from 2.6% to 1.7%. Similar results were obtained from the treatment of the Illinois No. 6 coal sample where ash rejections ranged from 40%-70% for a 28 {times} 325 mesh feed having 7% ash. Combustible recovery values from these tests were greater than 87% while treating mass feed rates between 1 to 2 tons/hour. A parametric study found that lower feed solids contents provided marginally lower product ash and total sulfur contents while feed rate and bowl speed appeared to have no significant effect over the range of values tested.

  5. ILLINOIS JOURNAL OF EDUCATION--ILLINOIS SCHOOLS AND EDUCATIONAL TELEVISION.

    ERIC Educational Resources Information Center

    PAGE, RAY

    THIS PUBLICATION CONTAINS THIRTEEN ARTICLES ON THE USE OF EDUCATIONAL TELEVISION IN ILLINOIS. AMONG THE TOPICS COVERED ARE MULTICHANNEL MICROWAVE EDUCATIONAL TELEVISION, INNOVATIVE TELEVISION, OPEN- AND CLOSED-CIRCUIT TELEVISON, TELEVISION IN PSYCHOLOGY, AND STATE EDUCATIONAL TELEVISION LEGISLATION. THE USE OF THE TELEVISION MEDIUM IN VARIOUS…

  6. toolkit computational mesh conceptual model.

    SciTech Connect

    Baur, David G.; Edwards, Harold Carter; Cochran, William K.; Williams, Alan B.; Sjaardema, Gregory D.

    2010-03-01

    The Sierra Toolkit computational mesh is a software library intended to support massively parallel multi-physics computations on dynamically changing unstructured meshes. This domain of intended use is inherently complex due to distributed memory parallelism, parallel scalability, heterogeneity of physics, heterogeneous discretization of an unstructured mesh, and runtime adaptation of the mesh. Management of this inherent complexity begins with a conceptual analysis and modeling of this domain of intended use; i.e., development of a domain model. The Sierra Toolkit computational mesh software library is designed and implemented based upon this domain model. Software developers using, maintaining, or extending the Sierra Toolkit computational mesh library must be familiar with the concepts/domain model presented in this report.

  7. Cubit Adaptive Meshing Algorithm Library

    2004-09-01

    CAMAL (Cubit adaptive meshing algorithm library) is a software component library for mesh generation. CAMAL 2.0 includes components for triangle, quad and tetrahedral meshing. A simple Application Programmers Interface (API) takes a discrete boundary definition and CAMAL computes a quality interior unstructured grid. The triangle and quad algorithms may also import a geometric definition of a surface on which to define the grid. CAMAL’s triangle meshing uses a 3D space advancing front method, the quadmore » meshing algorithm is based upon Sandia’s patented paving algorithm and the tetrahedral meshing algorithm employs the GHS3D-Tetmesh component developed by INRIA, France.« less

  8. PMESH: A parallel mesh generator

    SciTech Connect

    Hardin, D.D.

    1994-10-21

    The Parallel Mesh Generation (PMESH) Project is a joint LDRD effort by A Division and Engineering to develop a unique mesh generation system that can construct large calculational meshes (of up to 10{sup 9} elements) on massively parallel computers. Such a capability will remove a critical roadblock to unleashing the power of massively parallel processors (MPPs) for physical analysis. PMESH will support a variety of LLNL 3-D physics codes in the areas of electromagnetics, structural mechanics, thermal analysis, and hydrodynamics.

  9. Illinois Shifting Gears Policy Evaluation

    ERIC Educational Resources Information Center

    Weitzel, Peter C.

    2009-01-01

    Illinois Shifting Gears is a multilevel initiative that has simultaneously created bridge programs in the field and altered state policy to facilitate the creation of more programs in the future. These efforts have informed each other, giving policymakers the opportunity to interact with practitioners, troubleshoot bridge programs, and make…

  10. Illinois Birds. Nature Discovery I.

    ERIC Educational Resources Information Center

    Stone, Sally F.

    The birds of Illinois and their particular habitats are explored in this guide which is a part of a series of Nature Discovery publications. The materials are designed to directly supplement the natural science curricula and to complement other subject areas including social studies, language arts, music, and art. The program is formated for…

  11. Illinois: Child Care Collaboration Program

    ERIC Educational Resources Information Center

    Center for Law and Social Policy, Inc. (CLASP), 2012

    2012-01-01

    The Illinois Child Care Collaboration Program promotes collaboration between child care and other early care and education providers, including Early Head Start (EHS), by creating policies to ease blending of funds to extend the day or year of existing services. While no funding is provided through the initiative, participating programs may take…

  12. We Depend on Illinois' Environment.

    ERIC Educational Resources Information Center

    Illinois Environmental Protection Agency, Springfield.

    This teachers guide contains information and activities to provide 5th-grade students with a hands-on experience with air, land, and water pollution in Illinois. This booklet incorporates previous documents entitled: "Water the Liquid of Life,""The Land We Depend On," and "The Air We Breathe." The materials are designed to develop research,…

  13. Assessing Educational Reform: Illinois Experience.

    ERIC Educational Resources Information Center

    Wise, Connie; Ramirez, Al

    Findings from a study of Illinois' educational evaluation process, in which external evaluators conduct the evaluation, are presented in this paper. Methodology involved analysis by State Board of Education staff of requests for proposals (RFPs); these were mailed to 121 potential bidders for external evaluation. Bidders included universities,…

  14. Multigrid techniques for unstructured meshes

    NASA Technical Reports Server (NTRS)

    Mavriplis, D. J.

    1995-01-01

    An overview of current multigrid techniques for unstructured meshes is given. The basic principles of the multigrid approach are first outlined. Application of these principles to unstructured mesh problems is then described, illustrating various different approaches, and giving examples of practical applications. Advanced multigrid topics, such as the use of algebraic multigrid methods, and the combination of multigrid techniques with adaptive meshing strategies are dealt with in subsequent sections. These represent current areas of research, and the unresolved issues are discussed. The presentation is organized in an educational manner, for readers familiar with computational fluid dynamics, wishing to learn more about current unstructured mesh techniques.

  15. Multigrid for locally refined meshes

    SciTech Connect

    Shapira, Y.

    1999-12-01

    A multilevel method for the solution of finite element schemes on locally refined meshes is introduced. For isotropic diffusion problems, the condition number of the two-level method is bounded independently of the mesh size and the discontinuities in the diffusion coefficient. The curves of discontinuity need not be aligned with the coarse mesh. Indeed, numerical applications with 10 levels of local refinement yield a rapid convergence of the corresponding 10-level, multigrid V-cycle and other multigrid cycles which are more suitable for parallelism even when the discontinuities are invisible on most of the coarse meshes.

  16. Salt diffusion in interstitial waters and halite removal from sediments: Examples from the Red Sea and Illinois basins

    SciTech Connect

    Ranganathan, V. )

    1991-06-01

    Large thicknesses of bedded halite can be removed in subsiding sedimentary basins by verticla diffusion of dissolved salt in interstitial waters over geologic time scales. Calculations show that at least 10 m to 40 m of halite may have dissolved and diffused through the Red Sea sediments overlying the salt beds, since cessation of salt deposition approximatley 5.3 million years ago. The total amount of salt diffused out of the sediment column over geologic time is five to twenty times the amount of salt that currently exists in the porewater column. If upward flow in the past occurred at even small rates, 10{sup {minus}3} m/yr, the amount of halite removed could have been ten times as great, 500 m. Unlike the Red Sea Basin, no halite beds are known in the Illinois Basin in spite of the fact that interstitial waters with as much as 200{per thousand} TDS (approximately 220 g/L) occur. Calculations show that if a halite bed had been deposited at the base of the Illinois Basin in Cambrian time, it would have been completely removed from the stratigraphic record had it initially been less than 60 m to 130 m in thickness. A significant thickness of halite deposited in sedimentary basins may thus be removed during active burial of salt beds, and before exhumation and exposure of the salt beds to shallow meteoric waters.

  17. Risk Factors for Mesh Exposure after Transvaginal Mesh Surgery

    PubMed Central

    Niu, Ke; Lu, Yong-Xian; Shen, Wen-Jie; Zhang, Ying-Hui; Wang, Wen-Ying

    2016-01-01

    Background: Mesh exposure after surgery continues to be a clinical challenge for urogynecological surgeons. The purpose of this study was to explore the risk factors for polypropylene (PP) mesh exposure after transvaginal mesh (TVM) surgery. Methods: This study included 195 patients with advanced pelvic organ prolapse (POP), who underwent TVM from January 2004 to December 2012 at the First Affiliated Hospital of Chinese PLA General Hospital. Clinical data were evaluated including patient's demography, TVM type, concomitant procedures, operation time, blood loss, postoperative morbidity, and mesh exposure. Mesh exposure was identified through postoperative vaginal examination. Statistical analysis was performed to identify risk factors for mesh exposure. Results: Two-hundred and nine transvaginal PP meshes were placed, including 194 in the anterior wall and 15 in the posterior wall. Concomitant tension-free vaginal tape was performed in 61 cases. The mean follow-up time was 35.1 ± 23.6 months. PP mesh exposure was identified in 32 cases (16.4%), with 31 in the anterior wall and 1 in the posterior wall. Significant difference was found in operating time and concomitant procedures between exposed and nonexposed groups (F = 7.443, P = 0.007; F = 4.307, P = 0.039, respectively). Binary logistic regression revealed that the number of concomitant procedures and operation time were risk factors for mesh exposure (P = 0.001, P = 0.043). Conclusion: Concomitant procedures and increased operating time increase the risk for postoperative mesh exposure in patients undergoing TVM surgery for POP. PMID:27453227

  18. Invisible metallic mesh

    PubMed Central

    Ye, Dexin; Lu, Ling; Joannopoulos, John D.; Soljačić, Marin; Ran, Lixin

    2016-01-01

    A solid material possessing identical electromagnetic properties as air has yet to be found in nature. Such a medium of arbitrary shape would neither reflect nor refract light at any angle of incidence in free space. Here, we introduce nonscattering corrugated metallic wires to construct such a medium. This was accomplished by aligning the dark-state frequencies in multiple scattering channels of a single wire. Analytical solutions, full-wave simulations, and microwave measurement results on 3D printed samples show omnidirectional invisibility in any configuration. This invisible metallic mesh can improve mechanical stability, electrical conduction, and heat dissipation of a system, without disturbing the electromagnetic design. Our approach is simple, robust, and scalable to higher frequencies. PMID:26884208

  19. Invisible metallic mesh.

    PubMed

    Ye, Dexin; Lu, Ling; Joannopoulos, John D; Soljačić, Marin; Ran, Lixin

    2016-03-01

    A solid material possessing identical electromagnetic properties as air has yet to be found in nature. Such a medium of arbitrary shape would neither reflect nor refract light at any angle of incidence in free space. Here, we introduce nonscattering corrugated metallic wires to construct such a medium. This was accomplished by aligning the dark-state frequencies in multiple scattering channels of a single wire. Analytical solutions, full-wave simulations, and microwave measurement results on 3D printed samples show omnidirectional invisibility in any configuration. This invisible metallic mesh can improve mechanical stability, electrical conduction, and heat dissipation of a system, without disturbing the electromagnetic design. Our approach is simple, robust, and scalable to higher frequencies. PMID:26884208

  20. Laparoscopic paracolostomy hernia mesh repair.

    PubMed

    Virzí, Giuseppe; Giuseppe, Virzí; Scaravilli, Francesco; Francesco, Scaravilli; Ragazzi, Salvatore; Salvatore, Ragazzi; Piazza, Diego; Diego, Piazza

    2007-12-01

    Paracolostomy hernia is a common occurrence, representing a late complication of stoma surgery. Different surgical techniques have been proposed to repair the wall defect, but the lowest recurrence rates are associated with the use of mesh. We present the case report of a patient in which laparoscopic paracolostomy hernia mesh repair has been successfully performed. PMID:18097321

  1. Quadrilateral finite element mesh coarsening

    SciTech Connect

    Staten, Matthew L; Dewey, Mark W; Benzley, Steven E

    2012-10-16

    Techniques for coarsening a quadrilateral mesh are described. These techniques include identifying a coarsening region within the quadrilateral mesh to be coarsened. Quadrilateral elements along a path through the coarsening region are removed. Node pairs along opposite sides of the path are identified. The node pairs along the path are then merged to collapse the path.

  2. Adaptive and Unstructured Mesh Cleaving

    PubMed Central

    Bronson, Jonathan R.; Sastry, Shankar P.; Levine, Joshua A.; Whitaker, Ross T.

    2015-01-01

    We propose a new strategy for boundary conforming meshing that decouples the problem of building tetrahedra of proper size and shape from the problem of conforming to complex, non-manifold boundaries. This approach is motivated by the observation that while several methods exist for adaptive tetrahedral meshing, they typically have difficulty at geometric boundaries. The proposed strategy avoids this conflict by extracting the boundary conforming constraint into a secondary step. We first build a background mesh having a desired set of tetrahedral properties, and then use a generalized stenciling method to divide, or “cleave”, these elements to get a set of conforming tetrahedra, while limiting the impacts cleaving has on element quality. In developing this new framework, we make several technical contributions including a new method for building graded tetrahedral meshes as well as a generalization of the isosurface stuffing and lattice cleaving algorithms to unstructured background meshes. PMID:26137171

  3. Adaptive Skin Meshes Coarsening for Biomolecular Simulation.

    PubMed

    Shi, Xinwei; Koehl, Patrice

    2011-06-01

    In this paper, we present efficient algorithms for generating hierarchical molecular skin meshes with decreasing size and guaranteed quality. Our algorithms generate a sequence of coarse meshes for both the surfaces and the bounded volumes. Each coarser surface mesh is adaptive to the surface curvature and maintains the topology of the skin surface with guaranteed mesh quality. The corresponding tetrahedral mesh is conforming to the interface surface mesh and contains high quality tetrahedral that decompose both the interior of the molecule and the surrounding region (enclosed in a sphere). Our hierarchical tetrahedral meshes have a number of advantages that will facilitate fast and accurate multigrid PDE solvers. Firstly, the quality of both the surface triangulations and tetrahedral meshes is guaranteed. Secondly, the interface in the tetrahedral mesh is an accurate approximation of the molecular boundary. In particular, all the boundary points lie on the skin surface. Thirdly, our meshes are Delaunay meshes. Finally, the meshes are adaptive to the geometry. PMID:21779137

  4. Adaptive Skin Meshes Coarsening for Biomolecular Simulation

    PubMed Central

    Shi, Xinwei; Koehl, Patrice

    2011-01-01

    In this paper, we present efficient algorithms for generating hierarchical molecular skin meshes with decreasing size and guaranteed quality. Our algorithms generate a sequence of coarse meshes for both the surfaces and the bounded volumes. Each coarser surface mesh is adaptive to the surface curvature and maintains the topology of the skin surface with guaranteed mesh quality. The corresponding tetrahedral mesh is conforming to the interface surface mesh and contains high quality tetrahedral that decompose both the interior of the molecule and the surrounding region (enclosed in a sphere). Our hierarchical tetrahedral meshes have a number of advantages that will facilitate fast and accurate multigrid PDE solvers. Firstly, the quality of both the surface triangulations and tetrahedral meshes is guaranteed. Secondly, the interface in the tetrahedral mesh is an accurate approximation of the molecular boundary. In particular, all the boundary points lie on the skin surface. Thirdly, our meshes are Delaunay meshes. Finally, the meshes are adaptive to the geometry. PMID:21779137

  5. Streaming Compression of Hexahedral Meshes

    SciTech Connect

    Isenburg, M; Courbet, C

    2010-02-03

    We describe a method for streaming compression of hexahedral meshes. Given an interleaved stream of vertices and hexahedral our coder incrementally compresses the mesh in the presented order. Our coder is extremely memory efficient when the input stream documents when vertices are referenced for the last time (i.e. when it contains topological finalization tags). Our coder then continuously releases and reuses data structures that no longer contribute to compressing the remainder of the stream. This means in practice that our coder has only a small fraction of the whole mesh in memory at any time. We can therefore compress very large meshes - even meshes that do not file in memory. Compared to traditional, non-streaming approaches that load the entire mesh and globally reorder it during compression, our algorithm trades a less compact compressed representation for significant gains in speed, memory, and I/O efficiency. For example, on the 456k hexahedra 'blade' mesh, our coder is twice as fast and uses 88 times less memory (only 3.1 MB) with the compressed file increasing about 3% in size. We also present the first scheme for predictive compression of properties associated with hexahedral cells.

  6. 21 CFR 878.3300 - Surgical mesh.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ... GENERAL AND PLASTIC SURGERY DEVICES Prosthetic Devices § 878.3300 Surgical mesh. (a) Identification... acetabular and cement restrictor mesh used during orthopedic surgery. (b) Classification. Class II....

  7. 21 CFR 878.3300 - Surgical mesh.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... GENERAL AND PLASTIC SURGERY DEVICES Prosthetic Devices § 878.3300 Surgical mesh. (a) Identification... acetabular and cement restrictor mesh used during orthopedic surgery. (b) Classification. Class II....

  8. 21 CFR 878.3300 - Surgical mesh.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ... GENERAL AND PLASTIC SURGERY DEVICES Prosthetic Devices § 878.3300 Surgical mesh. (a) Identification... acetabular and cement restrictor mesh used during orthopedic surgery. (b) Classification. Class II....

  9. Nanowire mesh solar fuels generator

    DOEpatents

    Yang, Peidong; Chan, Candace; Sun, Jianwei; Liu, Bin

    2016-05-24

    This disclosure provides systems, methods, and apparatus related to a nanowire mesh solar fuels generator. In one aspect, a nanowire mesh solar fuels generator includes (1) a photoanode configured to perform water oxidation and (2) a photocathode configured to perform water reduction. The photocathode is in electrical contact with the photoanode. The photoanode may include a high surface area network of photoanode nanowires. The photocathode may include a high surface area network of photocathode nanowires. In some embodiments, the nanowire mesh solar fuels generator may include an ion conductive polymer infiltrating the photoanode and the photocathode in the region where the photocathode is in electrical contact with the photoanode.

  10. Diffraction efficiency of 200-nm-period critical-angle transmission gratings in the soft x-ray and extreme ultraviolet wavelength bands.

    PubMed

    Heilmann, Ralf K; Ahn, Minseung; Bruccoleri, Alex; Chang, Chih-Hao; Gullikson, Eric M; Mukherjee, Pran; Schattenburg, Mark L

    2011-04-01

    We report on measurements of the diffraction efficiency of 200-nm-period freestanding blazed transmission gratings for wavelengths in the 0.96 to 19.4 nm range. These critical-angle transmission (CAT) gratings achieve highly efficient blazing over a broad band via total external reflection off the sidewalls of smooth, tens of nanometer thin ultrahigh aspect-ratio silicon grating bars and thus combine the advantages of blazed x-ray reflection gratings with those of more conventional x-ray transmission gratings. Prototype gratings with maximum depths of 3.2 and 6 μm were investigated at two different blaze angles. In these initial CAT gratings the grating bars are monolithically connected to a cross support mesh that only leaves less than half of the grating area unobstructed. Because of our initial fabrication approach, the support mesh bars feature a strongly trapezoidal cross section that leads to varying CAT grating depths and partial absorption of diffracted orders. While theory predicts broadband absolute diffraction efficiencies as high as 60% for ideal CAT gratings without a support mesh, experimental results show efficiencies in the range of ∼50-100% of theoretical predictions when taking the effects of the support mesh into account. Future minimization of the support mesh therefore promises broadband CAT grating absolute diffraction efficiencies of 50% or higher. PMID:21460902

  11. Diffraction efficiency of 200-nm-period critical-angle transmission gratings in the soft x-ray and extreme ultraviolet wavelength bands

    SciTech Connect

    Heilmann, Ralf K.; Ahn, Minseung; Bruccoleri, Alex; Chang, Chih-Hao; Gullikson, Eric M.; Mukherjee, Pran; Schattenburg, Mark L.

    2011-04-01

    We report on measurements of the diffraction efficiency of 200-nm-period freestanding blazed transmission gratings for wavelengths in the 0.96 to 19.4 nm range. These critical-angle transmission (CAT) gratings achieve highly efficient blazing over a broad band via total external reflection off the sidewalls of smooth, tens of nanometer thin ultrahigh aspect-ratio silicon grating bars and thus combine the advantages of blazed x-ray reflection gratings with those of more conventional x-ray transmission gratings. Prototype gratings with maximum depths of 3.2 and 6 {mu}m were investigated at two different blaze angles. In these initial CAT gratings the grating bars are monolithically connected to a cross support mesh that only leaves less than half of the grating area unobstructed. Because of our initial fabrication approach, the support mesh bars feature a strongly trapezoidal cross section that leads to varying CAT grating depths and partial absorption of diffracted orders. While theory predicts broadband absolute diffraction efficiencies as high as 60% for ideal CAT gratings without a support mesh, experimental results show efficiencies in the range of {approx}50-100% of theoretical predictions when taking the effects of the support mesh into account. Future minimization of the support mesh therefore promises broadband CAT grating absolute diffraction efficiencies of 50% or higher.

  12. Augmentation mentoplasty using Mersilene mesh.

    PubMed

    McCollough, E G; Hom, D B; Weigel, M T; Anderson, J R

    1990-10-01

    Many different materials are available for augmentation mentoplasty. However, the optimal implant material for chin implantation has yet to be found. During the past several years, a number of experienced surgeons have turned to the use of Mersilene mesh. Mersilene mesh is a non-absorbable Dacron polyester fiber that can be conformed easily into layers to achieve tailored dimensions and shape. At the McCollough Plastic Surgery Clinic PA, Birmingham, Ala, 277 patients over a 10-year period underwent chin augmentation with Mersilene mesh implants. The material provides excellent tensile strength, durability, and surgical adaptability. The overall complication rate was 3.2% (nine patients); infection rate, 2.5% (seven patients); and removal secondary to infection, 1.7% (five patients). Based on this 10-year experience, Mersilene mesh remains our material of choice for chin augmentation. PMID:2206500

  13. Parallel Adaptive Mesh Refinement Library

    NASA Technical Reports Server (NTRS)

    Mac-Neice, Peter; Olson, Kevin

    2005-01-01

    Parallel Adaptive Mesh Refinement Library (PARAMESH) is a package of Fortran 90 subroutines designed to provide a computer programmer with an easy route to extension of (1) a previously written serial code that uses a logically Cartesian structured mesh into (2) a parallel code with adaptive mesh refinement (AMR). Alternatively, in its simplest use, and with minimal effort, PARAMESH can operate as a domain-decomposition tool for users who want to parallelize their serial codes but who do not wish to utilize adaptivity. The package builds a hierarchy of sub-grids to cover the computational domain of a given application program, with spatial resolution varying to satisfy the demands of the application. The sub-grid blocks form the nodes of a tree data structure (a quad-tree in two or an oct-tree in three dimensions). Each grid block has a logically Cartesian mesh. The package supports one-, two- and three-dimensional models.

  14. Gradient scaling for nonuniform meshes

    SciTech Connect

    Margolin, L.G.; Ruppel, H.M.; Demuth, R.B.

    1985-01-01

    This paper is concerned with the effect of nonuniform meshes on the accuracy of finite-difference calculations of fluid flow. In particular, when a simple shock propagates through a nonuniform mesh, one may fail to model the jump conditions across the shock even when the equations are differenced in manifestly conservative fashion. We develop an approximate dispersion analysis of the numerical equations and identify the source of the mesh dependency with the form of the artificial viscosity. We then derive an algebraic correction to the numerical equations - a scaling factor for the pressure gradient - to essentially eliminate the mesh dependency. We present several calculations to illustrate our theory. We conclude with an alternate interpretation of our results. 14 refs., 5 figs.

  15. Unstructured mesh methods for CFD

    NASA Technical Reports Server (NTRS)

    Peraire, J.; Morgan, K.; Peiro, J.

    1990-01-01

    Mesh generation methods for Computational Fluid Dynamics (CFD) are outlined. Geometric modeling is discussed. An advancing front method is described. Flow past a two engine Falcon aeroplane is studied. An algorithm and associated data structure called the alternating digital tree, which efficiently solves the geometric searching problem is described. The computation of an initial approximation to the steady state solution of a given poblem is described. Mesh generation for transient flows is described.

  16. Unstructured mesh methods for CFD

    NASA Astrophysics Data System (ADS)

    Peraire, J.; Morgan, K.; Peiro, J.

    Mesh generation methods for Computational Fluid Dynamics (CFD) are outlined. Geometric modeling is discussed. An advancing front method is described. Flow past a two engine Falcon aeroplane is studied. An algorithm and associated data structure called the alternating digital tree, which efficiently solves the geometric searching problem is described. The computation of an initial approximation to the steady state solution of a given poblem is described. Mesh generation for transient flows is described.

  17. Image-driven mesh optimization

    SciTech Connect

    Lindstrom, P; Turk, G

    2001-01-05

    We describe a method of improving the appearance of a low vertex count mesh in a manner that is guided by rendered images of the original, detailed mesh. This approach is motivated by the fact that greedy simplification methods often yield meshes that are poorer than what can be represented with a given number of vertices. Our approach relies on edge swaps and vertex teleports to alter the mesh connectivity, and uses the downhill simplex method to simultaneously improve vertex positions and surface attributes. Note that this is not a simplification method--the vertex count remains the same throughout the optimization. At all stages of the optimization the changes are guided by a metric that measures the differences between rendered versions of the original model and the low vertex count mesh. This method creates meshes that are geometrically faithful to the original model. Moreover, the method takes into account more subtle aspects of a model such as surface shading or whether cracks are visible between two interpenetrating parts of the model.

  18. Hydrogeologic characterization of Illinois wetlands

    SciTech Connect

    Miner, J.J.; Miller, M.V.; Rorick, N.L.; Fucciolo, C.S. )

    1994-04-01

    The Illinois State Geological Survey (ISGS), under contract from the Illinois Department of Transportation (IDOT), is evaluating a series of selected wetlands and sites proposed for wetland construction and/or restoration. The program is associated with wetland mitigation for unavoidable effects of state highway construction. The goal of this ongoing program is: (1) to collect commonly lacking geologic, geomorphic, hydrologic, and geochemical data from various wetland sites; and (2) to create a database of this information for use by government agencies and the private sector. Some of the potential uses of this database include: (1) determination of history, role, and possible life cycle of various wetland types allowing more effective design criteria; (2) functional comparison of constructed or restored wetlands versus natural wetlands; (3) testing of wetland hypotheses and delineation techniques under a variety of known hydrogeologic conditions in Illinois; (4) hydrogeologic assessment of potential mitigation sites against a suite of known sites; and (5) determination of data and collection methods appropriate for hydrogeologic wetland studies. A series of tasks is required to complete each study. Historical information is collected from ISGS records, including data regarding topography, soils, sediments, bedrock, and local well records. A field-testing plan is prepared, which includes goals of the study, methods, research potential, and potential results. An initial report is prepared after geologic and geochemical characterization and the installation of needed ground water monitoring wells and surface water gauges. After one year of water-level monitoring, a final report is prepared regarding the present conditions of a site. Further monitoring may be required to determine the performance at constructed and/or restored sites.

  19. Method and system for mesh network embedded devices

    NASA Technical Reports Server (NTRS)

    Wang, Ray (Inventor)

    2009-01-01

    A method and system for managing mesh network devices. A mesh network device with integrated features creates an N-way mesh network with a full mesh network topology or a partial mesh network topology.

  20. Belleville-Breese folio, Illinois

    USGS Publications Warehouse

    Udden, Johan August; Shaw, Eugene Wesley

    1915-01-01

    The Belleville and Breese quadrangles are bounded by meridians 89° 30' and 90° and parallels 38° 30' and 38° 45' and thus include one-eight of a square degree of the earth's surface, an area, in that latitude, of 466.56 square miles.  They lie in southwestern Illinois (see fig. 1), a few miles directly east of St. Louis, and comprise considerable portions of Clinton, Madison, and St. Clair counties, and a small part of Bond County.  Belleville, from which the Belleville quadrangle is named, is in the southwest corner of the area.

  1. University of Illinois Temperature Sensors

    SciTech Connect

    K. L. Davis; D. L. Knudson; J. L. Rempe; B. M. Chase

    2014-09-01

    This document summarizes background information and presents results related to temperature measurements in the Advanced Test Reactor (ATR) National Scientific User Facility (NSUF) University of Illinois Project 29609 irradiation. The objective of this test was to assess the radiation performance of ferritic alloys for advanced reactor applications. The FeCr-based alloy system is considered the lead alloy system for a variety of advanced reactor components and applications. Irradiations of FeCr alloy samples were performed using the Hydraulic Shuttle Irradiation System (HSIS) in the B-7 position and in a static capsule in the A-11 position of the ATR.

  2. MAP OF THE MAJOR WATERSHEDS OF ILLINOIS

    EPA Science Inventory

    This map illustrates general boundaries of major watersheds in Illinois. The watersheds in the Illinois River Basin are shaded green. A watershed is often considered synonymous with drainage basin, and in this context it is the land area which directly drains to a common stream...

  3. Illinois Occupational Skill Standards: Surgical Technologist.

    ERIC Educational Resources Information Center

    Illinois Occupational Skill Standards and Credentialing Council, Carbondale.

    This document, which is intended to serve as a guide for workforce preparation program providers, details the Illinois occupational skill standards for programs preparing students for employment as surgical technologists. The document begins with a brief overview of the Illinois perspective on occupational skill standards and credentialing, the…

  4. Illinois May Mandate ELL Rules for Preschool

    ERIC Educational Resources Information Center

    Zehr, Mary Ann

    2010-01-01

    The author reports the proposed regulations in Illinois which would require that districts offer English-learners in preschool the same support as in K-12. Questions are being raised about the proposed regulations. The Illinois board of education is poised to adopt these regulations next month. Should the board do so, it is believed that Illinois…

  5. Illinois Occupational Skill Standards: Architectural Drafting Cluster.

    ERIC Educational Resources Information Center

    Illinois Occupational Skill Standards and Credentialing Council, Carbondale.

    This document, which is intended as a guide for work force preparation program providers, details the Illinois occupational skill standards for programs preparing students for employment in occupations in the architectural drafting cluster. The document begins with a brief overview of the Illinois perspective on occupational skill standards and…

  6. Illinois Occupational Skill Standards: Mechanical Drafting Cluster.

    ERIC Educational Resources Information Center

    Illinois Occupational Skill Standards and Credentialing Council, Carbondale.

    This document, which is intended as a guide for work force preparation program providers, details the Illinois occupational skill standards for programs preparing students for employment in occupations in the mechanical drafting cluster. The document begins with a brief overview of the Illinois perspective on occupational skill standards and…

  7. Illinois Occupational Skill Standards. Meeting Professional Cluster.

    ERIC Educational Resources Information Center

    Illinois Occupational Skill Standards and Credentialing Council, Carbondale.

    This document, which is intended as a guide for workforce preparation program providers, details the Illinois occupational skill standards for programs preparing students for employment in the meeting professional occupational cluster. It begins with a brief overview of the Illinois perspective on occupational skill standards and credentialing,…

  8. Illinois Occupational Skill Standards: Telecommunications Technician Cluster.

    ERIC Educational Resources Information Center

    Illinois Occupational Skill Standards and Credentialing Council, Carbondale.

    This document, which is intended as a guide for workforce preparation program providers, details the Illinois Occupational Skill Standards for programs preparing students for employment in the telecommunications technician occupational cluster. The document begins with a brief overview of the Illinois perspective on occupational skills standards…

  9. Report to the General Assembly [of Illinois].

    ERIC Educational Resources Information Center

    Illinois Community Coll. Board, Springfield.

    In this nine-part report to Illinois' General Assembly, the Illinois Community College Board (ICCB) reviews Board powers and duties, and systemwide goals, financial resources, student characteristics and outcomes, educational programs, training and economic development activities, programs for special populations, and current issues of importance…

  10. Illinois Occupational Skill Standards. Beef Production Cluster.

    ERIC Educational Resources Information Center

    Illinois Occupational Skill Standards and Credentialing Council, Carbondale.

    This document, which is intended as a guide for workforce preparation program providers, details the Illinois occupational skill standards for programs preparing students for employment in occupations in the beef production cluster. The document begins with a brief overview of the Illinois perspective on occupational skill standards and…

  11. Illinois Occupational Skill Standards: Nursing Cluster.

    ERIC Educational Resources Information Center

    Illinois Occupational Skill Standards and Credentialing Council, Carbondale.

    These skill standards for the nursing cluster are intended to be a guide to workforce preparation program providers in defining content for their programs and to employers to establish the skills and standards necessary for job acquisition. An introduction provides the Illinois perspective; Illinois Occupational Skill Standards and Credentialing…

  12. Groundwater: Illinois' Buried Treasure. Education Activity Guide.

    ERIC Educational Resources Information Center

    Environmental Education Association of Illinois, Chicago.

    Groundwater is an extremely valuable resource that many feel has been too long neglected and taken for granted. There is growing recognition in Illinois and throughout the United States that comprehensive groundwater protection measures are vital. Illinois embarked on a course in protecting groundwater resources with the passage of the Illinois…

  13. Illinois Occupational Skill Standards: Automotive Technician Cluster.

    ERIC Educational Resources Information Center

    Illinois Occupational Skill Standards and Credentialing Council, Carbondale.

    This document, which is intended as a guide for work force preparation program providers, details the Illinois occupational skill standards for programs preparing students for employment in occupations in the automotive technician cluster. The document begins with overviews of the Illinois perspective on occupational skill standards and…

  14. 40 CFR 81.314 - Illinois.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... 40 Protection of Environment 18 2012-07-01 2012-07-01 false Illinois. 81.314 Section 81.314 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) AIR PROGRAMS (CONTINUED) DESIGNATION OF AREAS FOR AIR QUALITY PLANNING PURPOSES Section 107 Attainment Status Designations § 81.314 Illinois. Illinois—TSP Designated area Does not...

  15. 78 FR 36010 - Illinois Disaster #IL-00042

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-06-14

    ... From the Federal Register Online via the Government Publishing Office SMALL BUSINESS ADMINISTRATION Illinois Disaster IL-00042 AGENCY: U.S. Small Business Administration. ACTION: Notice. SUMMARY... State of Illinois (FEMA- 4116-DR), dated 06/06/2013. Incident: Severe Storms, Straight-line Winds...

  16. Illinois Fathers' Resource Guide. Second Edition.

    ERIC Educational Resources Information Center

    Hirsch, David

    The Illinois Fatherhood Initiative is a statewide non-profit organization whose mission is to connect children and fathers by promoting responsible fathering and helping equip men to become better fathers and father figures. This brochure was produced by the Illinois Fatherhood Initiative to help give fathers and communities the necessary tools to…

  17. User Manual for the PROTEUS Mesh Tools

    SciTech Connect

    Smith, Micheal A.; Shemon, Emily R.

    2015-06-01

    This report describes the various mesh tools that are provided with the PROTEUS code giving both descriptions of the input and output. In many cases the examples are provided with a regression test of the mesh tools. The most important mesh tools for any user to consider using are the MT_MeshToMesh.x and the MT_RadialLattice.x codes. The former allows the conversion between most mesh types handled by PROTEUS while the second allows the merging of multiple (assembly) meshes into a radial structured grid. Note that the mesh generation process is recursive in nature and that each input specific for a given mesh tool (such as .axial or .merge) can be used as “mesh” input for any of the mesh tools discussed in this manual.

  18. The Lagrange-mesh method

    NASA Astrophysics Data System (ADS)

    Baye, Daniel

    2015-03-01

    The Lagrange-mesh method is an approximate variational method taking the form of equations on a grid thanks to the use of a Gauss-quadrature approximation. The variational basis related to this Gauss quadrature is composed of Lagrange functions which are infinitely differentiable functions vanishing at all mesh points but one. This method is quite simple to use and, more importantly, can be very accurate with small number of mesh points for a number of problems. The accuracy may however be destroyed by singularities of the potential term. This difficulty can often be overcome by a regularization of the Lagrange functions which does not affect the simplicity and accuracy of the method. The principles of the Lagrange-mesh method are described, as well as various generalizations of the Lagrange functions and their regularization. The main existing meshes are reviewed and extensive formulas are provided which make the numerical calculations simple. They are in general based on classical orthogonal polynomials. The extensions to non-classical orthogonal polynomials and periodic functions are also presented. Applications start with the calculations of energies, wave functions and some observables for bound states in simple solvable models which can rather easily be used as exercises by the reader. The Dirac equation is also considered. Various problems in the continuum can also simply and accurately be solved with the Lagrange-mesh technique including multichannel scattering or scattering by non-local potentials. The method can be applied to three-body systems in appropriate systems of coordinates. Simple atomic, molecular and nuclear systems are taken as examples. The applications to the time-dependent Schrödinger equation, to the Gross-Pitaevskii equation and to Hartree-Fock calculations are also discussed as well as translations and rotations on a Lagrange mesh.

  19. Mercury content of Illinois soils

    USGS Publications Warehouse

    Dreher, G.B.; Follmer, L.R.

    2004-01-01

    For a survey of Illinois soils, 101 cores had been collected and analyzed to determine the current and background elemental compositions of Illinois soils. Mercury and other elements were determined in six samples per core, including a surface sample from each core. The mean mercury content in the surface samples was 33 ?? 20 ??g/kg soil, and the background content was 20 ?? 9 ??g/kg. The most probable sources of mercury in these soils were the parent material, and wet and dry deposition of Hg0 and Hg2+ derived from coal-burning power plants, other industrial plants, and medical and municipal waste incinerators. Mercury-bearing sewage sludge or other fertilizers applied to agricultural fields could have been the local sources of mercury. Although the mercury content correlated with organic carbon content or clay content in individual cores, when all the data were considered, there was no strong correlation between mercury and either the organic carbon or the clay-size content.

  20. Improvements to the Unstructured Mesh Generator MESH3D

    NASA Technical Reports Server (NTRS)

    Thomas, Scott D.; Baker, Timothy J.; Cliff, Susan E.

    1999-01-01

    The AIRPLANE process starts with an aircraft geometry stored in a CAD system. The surface is modeled with a mesh of triangles and then the flow solver produces pressures at surface points which may be integrated to find forces and moments. The biggest advantage is that the grid generation bottleneck of the CFD process is eliminated when an unstructured tetrahedral mesh is used. MESH3D is the key to turning around the first analysis of a CAD geometry in days instead of weeks. The flow solver part of AIRPLANE has proven to be robust and accurate over a decade of use at NASA. It has been extensively validated with experimental data and compares well with other Euler flow solvers. AIRPLANE has been applied to all the HSR geometries treated at Ames over the course of the HSR program in order to verify the accuracy of other flow solvers. The unstructured approach makes handling complete and complex geometries very simple because only the surface of the aircraft needs to be discretized, i.e. covered with triangles. The volume mesh is created automatically by MESH3D. AIRPLANE runs well on multiple platforms. Vectorization on the Cray Y-MP is reasonable for a code that uses indirect addressing. Massively parallel computers such as the IBM SP2, SGI Origin 2000, and the Cray T3E have been used with an MPI version of the flow solver and the code scales very well on these systems. AIRPLANE can run on a desktop computer as well. AIRPLANE has a future. The unstructured technologies developed as part of the HSR program are now targeting high Reynolds number viscous flow simulation. The pacing item in this effort is Navier-Stokes mesh generation.

  1. Cache-oblivious mesh layouts

    SciTech Connect

    Yoon, Sung-Eui; Lindstrom, Peter; Pascucci, Valerio; Manocha, Dinesh

    2005-07-01

    We present a novel method for computing cache-oblivious layouts of large meshes that improve the performance of interactive visualization and geometric processing algorithms. Given that the mesh is accessed in a reasonably coherent manner, we assume no particular data access patterns or cache parameters of the memory hierarchy involved in the computation. Furthermore, our formulation extends directly to computing layouts of multi-resolution and bounding volume hierarchies of large meshes. We develop a simple and practical cache-oblivious metric for estimating cache misses. Computing a coherent mesh layout is reduced to a combinatorial optimization problem. We designed and implemented an out-of-core multilevel minimization algorithm and tested its performance on unstructured meshes composed of tens to hundreds of millions of triangles. Our layouts can significantly reduce the number of cache misses. We have observed 2-20 times speedups in view-dependent rendering, collision detection, and isocontour extraction without any modification of the algorithms or runtime applications.

  2. Self-Organizing Mesh Generation

    1991-11-01

    A set of five programs which make up a self organizing mesh generation package. QMESH generates meshes having quadrilateral elements on arbitrarily shaped two-dimensional (planar or axisymmetric) bodies. It is designed for use with two-dimensional finite element analysis applications. A flexible hierarchal input scheme is used to describe bodies to QMESH as collections of regions. A mesh for each region is developed independently, with the final assembly and bandwidth minimization performed by the independent program,more » RENUM or RENUM8. RENUM is applied when four-node elements are desired. Eight node elements (with mid side nodes) may be obtained with RENUM8. QPLOT and QPLOT8 are plot programs for meshes generated by the QMESH/RENUM and QMESH/RENUM8 program pairs respectively. QPLOT and QPLOT8 automatically section the mesh into appropriately-sized sections for legible display of node and element numbers, An overall plot showing the position of the selected plot areas is produced.« less

  3. Cancer in Illinois construction workers: a study.

    PubMed

    Keller, J E; Howe, H L

    1993-08-01

    A series of case-control studies using subjects from the Illinois State Cancer Registry have been conducted. Logistic regression was used to control for age and history of tobacco and alcohol use. Construction workers were consistently found to be younger than other subjects and to have used alcohol and tobacco more often. Significant positive associations between cancer of the stomach and welding (odds ratio [OR] = 2.11, 95% confidence interval [CI] = 1.09, 4.09), lung cancer and employment in the construction industry (OR = 1.18, 95% CI = 1.02, 1.26), and lung cancer and welding (OR = 1.68, 95% CI = 1.03, 2.76) were found. Significant negative associations between cancer of the colon and welding (OR = .54, 95% CI = .29, 1.00), cancer of the prostate and employment in the construction industry (OR = .76, 95% CI = .65, .89), cancer of the prostate and plumbing (OR = .44, 95% CI = .38, .50), cancer of the prostate and metal working (OR = .43, 95% CI = .19, .93), and bladder cancer and employment as an electrician (OR = .60, 95% CI = .36, 1.00) suggests that construction workers did not consistently experience excesses of cancers known to be associated with tobacco use, and an overall excess of sites not known to be related to tobacco use may have occurred. PMID:8213848

  4. Coal and nuclear power: Illinois' energy future

    SciTech Connect

    Not Available

    1982-01-01

    This conference was sponsored by the Energy Resources Center, University of Illinois at Chicago; the US Department of Energy; the Illinois Energy Resources Commission; and the Illinois Department of Energy and Natural Resources. The theme for the conference, Coal and Nuclear Power: Illinois' Energy Future, was based on two major observations: (1) Illinois has the largest reserves of bituminous coal of any state and is surpassed in total reserves only by North Dakota, and Montana; and (2) Illinois has made a heavy commitment to the use of nuclear power as a source of electrical power generation. Currently, nuclear power represents 30% of the electrical energy produced in the State. The primary objective of the 1982 conference was to review these two energy sources in view of the current energy policy of the Reagan Administration, and to examine the impact these policies have on the Midwest energy scene. The conference dealt with issues unique to Illinois as well as those facing the entire nation. A separate abstract was prepared for each of the 30 individual presentations.

  5. Parallel automated adaptive procedures for unstructured meshes

    NASA Technical Reports Server (NTRS)

    Shephard, M. S.; Flaherty, J. E.; Decougny, H. L.; Ozturan, C.; Bottasso, C. L.; Beall, M. W.

    1995-01-01

    Consideration is given to the techniques required to support adaptive analysis of automatically generated unstructured meshes on distributed memory MIMD parallel computers. The key areas of new development are focused on the support of effective parallel computations when the structure of the numerical discretization, the mesh, is evolving, and in fact constructed, during the computation. All the procedures presented operate in parallel on already distributed mesh information. Starting from a mesh definition in terms of a topological hierarchy, techniques to support the distribution, redistribution and communication among the mesh entities over the processors is given, and algorithms to dynamically balance processor workload based on the migration of mesh entities are given. A procedure to automatically generate meshes in parallel, starting from CAD geometric models, is given. Parallel procedures to enrich the mesh through local mesh modifications are also given. Finally, the combination of these techniques to produce a parallel automated finite element analysis procedure for rotorcraft aerodynamics calculations is discussed and demonstrated.

  6. Issues in adaptive mesh refinement

    SciTech Connect

    Dai, William Wenlong

    2009-01-01

    In this paper, we present an approach for a patch-based adaptive mesh refinement (AMR) for multi-physics simulations. The approach consists of clustering, symmetry preserving, mesh continuity, flux correction, communications, and management of patches. Among the special features of this patch-based AMR are symmetry preserving, efficiency of refinement, special implementation offlux correction, and patch management in parallel computing environments. Here, higher efficiency of refinement means less unnecessarily refined cells for a given set of cells to be refined. To demonstrate the capability of the AMR framework, hydrodynamics simulations with many levels of refinement are shown in both two- and three-dimensions.

  7. A novel method for pair-matching using three-dimensional digital models of bone: mesh-to-mesh value comparison.

    PubMed

    Karell, Mara A; Langstaff, Helen K; Halazonetis, Demetrios J; Minghetti, Caterina; Frelat, Mélanie; Kranioti, Elena F

    2016-09-01

    The commingling of human remains often hinders forensic/physical anthropologists during the identification process, as there are limited methods to accurately sort these remains. This study investigates a new method for pair-matching, a common individualization technique, which uses digital three-dimensional models of bone: mesh-to-mesh value comparison (MVC). The MVC method digitally compares the entire three-dimensional geometry of two bones at once to produce a single value to indicate their similarity. Two different versions of this method, one manual and the other automated, were created and then tested for how well they accurately pair-matched humeri. Each version was assessed using sensitivity and specificity. The manual mesh-to-mesh value comparison method was 100 % sensitive and 100 % specific. The automated mesh-to-mesh value comparison method was 95 % sensitive and 60 % specific. Our results indicate that the mesh-to-mesh value comparison method overall is a powerful new tool for accurately pair-matching commingled skeletal elements, although the automated version still needs improvement. PMID:26966098

  8. Adhesions to Mesh after Ventral Hernia Mesh Repair Are Detected by MRI but Are Not a Cause of Long Term Chronic Abdominal Pain

    PubMed Central

    Langbach, Odd; Holmedal, Stein Harald; Grandal, Ole Jacob

    2016-01-01

    Aim. The aim of the present study was to perform MRI in patients after ventral hernia mesh repair, in order to evaluate MRI's ability to detect intra-abdominal adhesions. Materials and Methods. Single-center long term follow-up study of 155 patients operated for ventral hernia with laparoscopic (LVHR) or open mesh repair (OVHR), including analyzing medical records, clinical investigation with patient-reported pain (VAS-scale), and MRI. MRI was performed in 124 patients: 114 patients (74%) after follow-up, and 10 patients referred for late complaints after ventral mesh repair. To verify the MRI-diagnosis of adhesions, laparoscopy was performed after MRI in a cohort of 20 patients. Results. MRI detected adhesions between bowel and abdominal wall/mesh in 60% of the patients and mesh shrinkage in 20–50%. Adhesions were demonstrated to all types of meshes after both LVHR and OVHR with a sensitivity of 70%, specificity of 75%, positive predictive value of 78%, and negative predictive value of 67%. Independent predictors for formation of adhesions were mesh area as determined by MRI and Charlson index. The presence of adhesions was not associated with more pain. Conclusion. MRI can detect adhesions between bowel and abdominal wall in a fair reliable way. Adhesions are formed both after open and laparoscopic hernia mesh repair and are not associated with chronic pain. PMID:26819601

  9. Adhesions to Mesh after Ventral Hernia Mesh Repair Are Detected by MRI but Are Not a Cause of Long Term Chronic Abdominal Pain.

    PubMed

    Langbach, Odd; Holmedal, Stein Harald; Grandal, Ole Jacob; Røkke, Ola

    2016-01-01

    Aim. The aim of the present study was to perform MRI in patients after ventral hernia mesh repair, in order to evaluate MRI's ability to detect intra-abdominal adhesions. Materials and Methods. Single-center long term follow-up study of 155 patients operated for ventral hernia with laparoscopic (LVHR) or open mesh repair (OVHR), including analyzing medical records, clinical investigation with patient-reported pain (VAS-scale), and MRI. MRI was performed in 124 patients: 114 patients (74%) after follow-up, and 10 patients referred for late complaints after ventral mesh repair. To verify the MRI-diagnosis of adhesions, laparoscopy was performed after MRI in a cohort of 20 patients. Results. MRI detected adhesions between bowel and abdominal wall/mesh in 60% of the patients and mesh shrinkage in 20-50%. Adhesions were demonstrated to all types of meshes after both LVHR and OVHR with a sensitivity of 70%, specificity of 75%, positive predictive value of 78%, and negative predictive value of 67%. Independent predictors for formation of adhesions were mesh area as determined by MRI and Charlson index. The presence of adhesions was not associated with more pain. Conclusion. MRI can detect adhesions between bowel and abdominal wall in a fair reliable way. Adhesions are formed both after open and laparoscopic hernia mesh repair and are not associated with chronic pain. PMID:26819601

  10. Genesis and continuity of quaternary sand and gravel in glacigenic sediment at a proposed low-level radioactive waste disposal site in east-central Illinois

    USGS Publications Warehouse

    Troost, K.G.; Curry, B. Brandon

    1991-01-01

    The Illinois Department of Nuclear Safety has characterized the Martinsville Alternative Site (MAS) for a proposed low-level radioactive waste disposal facility. The MAS is located in east-central Illinois approximately 1.6 km (1 mi) north of the city of Martinsville. Geologic investigation of the 5.5-km2 (1380-acre) site revealed a sequence of chiefly Illinoian glacigenic sediments from 6 to 60 m (20-200 ft) thick overlying two major bedrock valleys carved in Pennsylvanian strata. Relatively permeable buried units include basal, preglacial alluvium; a complex of intraglacial and subglacial sediment; englacial deposits; and supraglacial fluvial deposits. Postglacial alluvium underlies stream valleys on and adjacent to the site. In most areas, the buried sand units are confined by low-permeability till, lacustrine sediment, colluvium, and loess. The distribution and thickness of the most extensive and continuous buried sand units have been modified considerably by subglacial erosion, and their distributions have been influenced by the buried bedrock valleys. The most continuous of the various sand units were deposited as preglacial and postglacial alluvium and are the uppermost and lowermost stratigraphic units at the alternative site. Sand units that were deposited in englacial or ice-marginal environments are less continuous. Aquifer pumping tests, potentiometric head data, and groundwater geochemistry analyses indicate minimal interaction of groundwater across localized interconnections of the permeable units. ?? 1991 Springer-Verlag New York Inc.

  11. 40 CFR Appendix G to Part 60 - Provisions for an Alternative Method of Demonstrating Compliance With 40 CFR 60.43 for the Newton...

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... Demonstrating Compliance With 40 CFR 60.43 for the Newton Power Station of Central Illinois Public Service... Appendix G to Part 60—Provisions for an Alternative Method of Demonstrating Compliance With 40 CFR 60.43... accordance with the quality assurance requirements of section 5.1.1 of 40 CFR part 60, appendix F. Each...

  12. 40 CFR Appendix G to Part 60 - Provisions for an Alternative Method of Demonstrating Compliance With 40 CFR 60.43 for the Newton...

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... Demonstrating Compliance With 40 CFR 60.43 for the Newton Power Station of Central Illinois Public Service... Appendix G to Part 60—Provisions for an Alternative Method of Demonstrating Compliance With 40 CFR 60.43... of 40 CFR part 60, appendix F. Each SO2 and diluent CEMs shall be subject to cylinder gas audits...

  13. 40 CFR Appendix G to Part 60 - Provisions for an Alternative Method of Demonstrating Compliance With 40 CFR 60.43 for the Newton...

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... Demonstrating Compliance With 40 CFR 60.43 for the Newton Power Station of Central Illinois Public Service... Appendix G to Part 60—Provisions for an Alternative Method of Demonstrating Compliance With 40 CFR 60.43... accordance with the quality assurance requirements of section 5.1.1 of 40 CFR part 60, appendix F. Each...

  14. 40 CFR Appendix G to Part 60 - Provisions for an Alternative Method of Demonstrating Compliance With 40 CFR 60.43 for the Newton...

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... Demonstrating Compliance With 40 CFR 60.43 for the Newton Power Station of Central Illinois Public Service... Appendix G to Part 60—Provisions for an Alternative Method of Demonstrating Compliance With 40 CFR 60.43... accordance with the quality assurance requirements of section 5.1.1 of 40 CFR part 60, appendix F. Each...

  15. 40 CFR Appendix G to Part 60 - Provisions for an Alternative Method of Demonstrating Compliance With 40 CFR 60.43 for the Newton...

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... Demonstrating Compliance With 40 CFR 60.43 for the Newton Power Station of Central Illinois Public Service... Appendix G to Part 60—Provisions for an Alternative Method of Demonstrating Compliance With 40 CFR 60.43... accordance with the quality assurance requirements of section 5.1.1 of 40 CFR part 60, appendix F. Each...

  16. Hybrid mesh for nasal airflow studies.

    PubMed

    Zubair, Mohammed; Abdullah, Mohammed Zulkifly; Ahmad, Kamarul Arifin

    2013-01-01

    The accuracy of the numerical result is closely related to mesh density as well as its distribution. Mesh plays a very significant role in the outcome of numerical simulation. Many nasal airflow studies have employed unstructured mesh and more recently hybrid mesh scheme has been utilized considering the complexity of anatomical architecture. The objective of this study is to compare the results of hybrid mesh with unstructured mesh and study its effect on the flow parameters inside the nasal cavity. A three-dimensional nasal cavity model is reconstructed based on computed tomographic images of a healthy Malaysian adult nose. Navier-Stokes equation for steady airflow is solved numerically to examine inspiratory nasal flow. The pressure drop obtained using the unstructured computational grid is about 22.6 Pa for a flow rate of 20 L/min, whereas the hybrid mesh resulted in 17.8 Pa for the same flow rate. The maximum velocity obtained at the nasal valve using unstructured grid is 4.18 m/s and that with hybrid mesh is around 4.76 m/s. Hybrid mesh reported lower grid convergence index (GCI) than the unstructured mesh. Significant differences between unstructured mesh and hybrid mesh are determined highlighting the usefulness of hybrid mesh for nasal airflow studies. PMID:23983811

  17. Hybrid Mesh for Nasal Airflow Studies

    PubMed Central

    Zubair, Mohammed; Abdullah, Mohammed Zulkifly; Ahmad, Kamarul Arifin

    2013-01-01

    The accuracy of the numerical result is closely related to mesh density as well as its distribution. Mesh plays a very significant role in the outcome of numerical simulation. Many nasal airflow studies have employed unstructured mesh and more recently hybrid mesh scheme has been utilized considering the complexity of anatomical architecture. The objective of this study is to compare the results of hybrid mesh with unstructured mesh and study its effect on the flow parameters inside the nasal cavity. A three-dimensional nasal cavity model is reconstructed based on computed tomographic images of a healthy Malaysian adult nose. Navier-Stokes equation for steady airflow is solved numerically to examine inspiratory nasal flow. The pressure drop obtained using the unstructured computational grid is about 22.6 Pa for a flow rate of 20 L/min, whereas the hybrid mesh resulted in 17.8 Pa for the same flow rate. The maximum velocity obtained at the nasal valve using unstructured grid is 4.18 m/s and that with hybrid mesh is around 4.76 m/s. Hybrid mesh reported lower grid convergence index (GCI) than the unstructured mesh. Significant differences between unstructured mesh and hybrid mesh are determined highlighting the usefulness of hybrid mesh for nasal airflow studies. PMID:23983811

  18. Mesh Size Control of Friction

    NASA Astrophysics Data System (ADS)

    Pitenis, Angela; Uruena, Juan Manuel; Schulze, Kyle D.; Cooper, Andrew C.; Angelini, Thomas E.; Sawyer, W. Gregory

    Soft, permeable sliding interfaces in aqueous environments are ubiquitous in nature but their ability to maintain high lubricity in a poor lubricant (water) has not been well understood. Hydrogels are excellent materials for fundamental soft matter and biotribology studies due to their high water content. While mesh size controls the material and transport properties of a hydrogel, its effects on friction were only recently explored. Polyacrylamide hydrogels slid in a Gemini (self-mated) interface produced low friction under low speeds, low pressures, macroscopic contact areas, and room temperature aqueous environments. The friction coefficients at these interfaces are lowest at low speeds and are speed-independent. This behavior is due to thermal fluctuations at the interface separating the surfaces, with water shearing in this region being the main source of dissipation. We found that mesh size had an inverse correlation with friction. We further investigated a transition from this behavior at higher speeds, and found that the transition speed correlated with the mesh size and relaxation time of the polymer network. Very soft and correspondingly large mesh size Gemini hydrogels show superlubricity under specific conditions with friction being less than 0.005.

  19. Multigrid for refined triangle meshes

    SciTech Connect

    Shapira, Yair

    1997-02-01

    A two-level preconditioning method for the solution of (locally) refined finite element schemes using triangle meshes is introduced. In the isotropic SPD case, it is shown that the condition number of the preconditioned stiffness matrix is bounded uniformly for all sufficiently regular triangulations. This is also verified numerically for an isotropic diffusion problem with highly discontinuous coefficients.

  20. Changing Patterns in Illinois' School Tort Immunity.

    ERIC Educational Resources Information Center

    Gardner, Shelley B.

    1979-01-01

    It appears that Illinois law no longer grants full parental immunity to school districts and their employees. Available from IIT/Chicago-Kent College of Law, 77 South Wacker Drive, Chicago, IL 60606; single copies $5.00. (Author)

  1. Optimizing the geometrical accuracy of curvilinear meshes

    NASA Astrophysics Data System (ADS)

    Toulorge, Thomas; Lambrechts, Jonathan; Remacle, Jean-François

    2016-04-01

    This paper presents a method to generate valid high order meshes with optimized geometrical accuracy. The high order meshing procedure starts with a linear mesh, that is subsequently curved without taking care of the validity of the high order elements. An optimization procedure is then used to both untangle invalid elements and optimize the geometrical accuracy of the mesh. Standard measures of the distance between curves are considered to evaluate the geometrical accuracy in planar two-dimensional meshes, but they prove computationally too costly for optimization purposes. A fast estimate of the geometrical accuracy, based on Taylor expansions of the curves, is introduced. An unconstrained optimization procedure based on this estimate is shown to yield significant improvements in the geometrical accuracy of high order meshes, as measured by the standard Hausdorff distance between the geometrical model and the mesh. Several examples illustrate the beneficial impact of this method on CFD solutions, with a particular role of the enhanced mesh boundary smoothness.

  2. Application of Quaternions for Mesh Deformation

    NASA Technical Reports Server (NTRS)

    Samareh, Jamshid A.

    2002-01-01

    A new three-dimensional mesh deformation algorithm, based on quaternion algebra, is introduced. A brief overview of quaternion algebra is provided, along with some preliminary results for two-dimensional structured and unstructured viscous mesh deformation.

  3. 6th International Meshing Roundtable '97

    SciTech Connect

    White, D.

    1997-09-01

    The goal of the 6th International Meshing Roundtable is to bring together researchers and developers from industry, academia, and government labs in a stimulating, open environment for the exchange of technical information related to the meshing process. In the pas~ the Roundtable has enjoyed significant participation born each of these groups from a wide variety of countries. The Roundtable will consist of technical presentations from contributed papers and abstracts, two invited speakers, and two invited panels of experts discussing topics related to the development and use of automatic mesh generation tools. In addition, this year we will feature a "Bring Your Best Mesh" competition and poster session to encourage discussion and participation from a wide variety of mesh generation tool users. The schedule and evening social events are designed to provide numerous opportunities for informal dialog. A proceedings will be published by Sandia National Laboratories and distributed at the Roundtable. In addition, papers of exceptionally high quaIity will be submitted to a special issue of the International Journal of Computational Geometry and Applications. Papers and one page abstracts were sought that present original results on the meshing process. Potential topics include but are got limited to: Unstructured triangular and tetrahedral mesh generation Unstructured quadrilateral and hexahedral mesh generation Automated blocking and structured mesh generation Mixed element meshing Surface mesh generation Geometry decomposition and clean-up techniques Geometry modification techniques related to meshing Adaptive mesh refinement and mesh quality control Mesh visualization Special purpose meshing algorithms for particular applications Theoretical or novel ideas with practical potential Technical presentations from industrial researchers.

  4. Heterogeneous integration of gels into microfluidics using a mesh carrier.

    PubMed

    Eker, Bilge; Temiz, Yuksel; Delamarche, Emmanuel

    2014-12-01

    The incorporation of hydrogels inside microfluidics is a promising method for localizing receptors inside microfluidic structures for many bio-analytical applications as well as for working with cells. However, current methods rely on the in situ polymerization of hydrogels and therefore necessitate optical masks and extensive post-polymerization steps for example for washing uncrosslinked gel precursors and receptors. Here, we report a simple and efficient method for the integration of hydrogels to microfluidic chips. Small volumes of poly(ethylene)glycol-based acrylamide (PEGACA) hydrogels are photopolymerized on a mesh, rinsed, partially dried and transferred to microfluidic structures by simple contact. The gels can be derivatized before transfer with receptors such as streptavidin, antibodies, or can entrap beads as small as 200 nm. We detail the role of meshes relative to the mesh density and wettability and demonstrate how hydrogels can be transferred into capillary-driven microfluidic chips, which are easily sealed using a dry-film resist. By analogy to microfabrication strategies wherein critical components are produced separately and then combined, our method introduces the concept of heterogeneous integration of critical (bio)chemicals to microfluidic chips using an intermediate mesh carrier. PMID:24999091

  5. Time To Learn: A Study of the Educational Histories of Incarcerated Juveniles. Preliminary Report to [the] Illinois General Assembly.

    ERIC Educational Resources Information Center

    Kyle, Charles; And Others

    In 1990-91, the educational histories of incarcerated juveniles in Illinois were analyzed to assess the value of educational intervention strategies prior to incarceration. Following open-ended interviews with public officials, structured interviews were held with 200 juvenile offenders, of whom 50 were female, from all parts of the state. The…

  6. Conservation properties of unstructured staggered mesh schemes

    SciTech Connect

    Perot, B.

    2000-03-20

    Classic Cartesian staggered mesh schemes have a number of attractive properties. They do not display spurious pressure modes and they have been shown to locally conserve, mass, momentum, kinetic energy, and circulation to machine precision. Recently, a number of generalizations of the staggered mesh approach have been proposed for unstructured (triangular or tetrahedral) meshes. These unstructured staggered mesh methods have been created to retain the attractive pressure aspects and mass conservation properties of the classic Cartesian mesh method. This work addresses the momentum, kinetic energy, and circulation conservation properties of unstructured staggered mesh methods. It is shown that with certain choices of the velocity interpolation, unstructured staggered mesh discretization of the divergence form of the Navier-Stokes equations can conserve kinetic energy and momentum both locally and globally. In addition, it is shown that unstructured staggered mesh discretization of the rotational form of the Navier-Stokes equations can conserve kinetic energy and circulation both locally and globally. The analysis includes viscous terms and a generalization of the concept of conservation in the presence of viscosity to include a negative definite dissipation term in the kinetic energy equation. These novel conserving unstructured staggered mesh schemes have not been previously analyzed. It is shown that they are first-order accurate on nonuniform two-dimensional unstructured meshes and second-order accurate on uniform unstructured meshes. Numerical confirmation of the conservation properties and the order of accuracy of these unstructured staggered mesh methods is presented.

  7. Hybrid mesh generation using advancing reduction technique

    Technology Transfer Automated Retrieval System (TEKTRAN)

    This study presents an extension of the application of the advancing reduction technique to the hybrid mesh generation. The proposed algorithm is based on a pre-generated rectangle mesh (RM) with a certain orientation. The intersection points between the two sets of perpendicular mesh lines in RM an...

  8. Computing The Compliances Of Gear Meshes

    NASA Technical Reports Server (NTRS)

    Lewicki, D. G.; Savage, M.; Caldwell, R. J.; Wisor, G. D.

    1988-01-01

    Computer model simulates compliance and sharing of loads in spur-gear mesh. Use of solid-body analysis as lower bound and rim analysis as upper bound for mesh compliance, reasonable approximations obtained for compliance in spur-gear mesh.

  9. IllinoisGRMHD: an open-source, user-friendly GRMHD code for dynamical spacetimes

    NASA Astrophysics Data System (ADS)

    Etienne, Zachariah B.; Paschalidis, Vasileios; Haas, Roland; Mösta, Philipp; Shapiro, Stuart L.

    2015-09-01

    In the extreme violence of merger and mass accretion, compact objects like black holes and neutron stars are thought to launch some of the most luminous outbursts of electromagnetic and gravitational wave energy in the Universe. Modeling these systems realistically is a central problem in theoretical astrophysics, but has proven extremely challenging, requiring the development of numerical relativity codes that solve Einstein's equations for the spacetime, coupled to the equations of general relativistic (ideal) magnetohydrodynamics (GRMHD) for the magnetized fluids. Over the past decade, the Illinois numerical relativity (ILNR) group's dynamical spacetime GRMHD code has proven itself as a robust and reliable tool for theoretical modeling of such GRMHD phenomena. However, the code was written ‘by experts and for experts’ of the code, with a steep learning curve that would severely hinder community adoption if it were open-sourced. Here we present IllinoisGRMHD, which is an open-source, highly extensible rewrite of the original closed-source GRMHD code of the ILNR group. Reducing the learning curve was the primary focus of this rewrite, with the goal of facilitating community involvement in the code's use and development, as well as the minimization of human effort in generating new science. IllinoisGRMHD also saves computer time, generating roundoff-precision identical output to the original code on adaptive-mesh grids, but nearly twice as fast at scales of hundreds to thousands of cores.

  10. Bridge Programs in Illinois: Results of the 2010 Illinois Bridge Status Survey

    ERIC Educational Resources Information Center

    Taylor, J. L.; Harmon, T.

    2010-01-01

    This report provides a summary of major results of the Illinois Bridge Status Survey, administered online between April and June 2010. The purpose of the survey was to understand the extent to which bridge programs are being implemented in Illinois, as well as to build an online directory of bridge programs. Bridge programs are an emerging…

  11. 24 CFR 200.425 - Exemptions.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ... exemptions set forth in the regulations of the Secretary of Labor at 41 CFR 60-1.5 apply to transactions... 24 Housing and Urban Development 2 2012-04-01 2012-04-01 false Exemptions. 200.425 Section 200.425 Housing and Urban Development Regulations Relating to Housing and Urban Development (Continued) OFFICE...

  12. Confined helium on Lagrange meshes.

    PubMed

    Baye, D; Dohet-Eraly, J

    2015-12-21

    The Lagrange-mesh method has the simplicity of a calculation on a mesh and can have the accuracy of a variational method. It is applied to the study of a confined helium atom. Two types of confinement are considered. Soft confinements by potentials are studied in perimetric coordinates. Hard confinement in impenetrable spherical cavities is studied in a system of rescaled perimetric coordinates varying in [0,1] intervals. Energies and mean values of the distances between electrons and between an electron and the helium nucleus are calculated. A high accuracy of 11 to 15 significant figures is obtained with small computing times. Pressures acting on the confined atom are also computed. For sphere radii smaller than 1, their relative accuracies are better than 10(-10). For larger radii up to 10, they progressively decrease to 10(-3), still improving the best literature results. PMID:25732054

  13. The moving mesh code SHADOWFAX

    NASA Astrophysics Data System (ADS)

    Vandenbroucke, B.; De Rijcke, S.

    2016-07-01

    We introduce the moving mesh code SHADOWFAX, which can be used to evolve a mixture of gas, subject to the laws of hydrodynamics and gravity, and any collisionless fluid only subject to gravity, such as cold dark matter or stars. The code is written in C++ and its source code is made available to the scientific community under the GNU Affero General Public Licence. We outline the algorithm and the design of our implementation, and demonstrate its validity through the results of a set of basic test problems, which are also part of the public version. We also compare SHADOWFAX with a number of other publicly available codes using different hydrodynamical integration schemes, illustrating the advantages and disadvantages of the moving mesh technique.

  14. Implicit solvers for unstructured meshes

    NASA Technical Reports Server (NTRS)

    Venkatakrishnan, V.; Mavriplis, Dimitri J.

    1991-01-01

    Implicit methods were developed and tested for unstructured mesh computations. The approximate system which arises from the Newton linearization of the nonlinear evolution operator is solved by using the preconditioned GMRES (Generalized Minimum Residual) technique. Three different preconditioners were studied, namely, the incomplete LU factorization (ILU), block diagonal factorization, and the symmetric successive over relaxation (SSOR). The preconditioners were optimized to have good vectorization properties. SSOR and ILU were also studied as iterative schemes. The various methods are compared over a wide range of problems. Ordering of the unknowns, which affects the convergence of these sparse matrix iterative methods, is also studied. Results are presented for inviscid and turbulent viscous calculations on single and multielement airfoil configurations using globally and adaptively generated meshes.

  15. Unstructured mesh algorithms for aerodynamic calculations

    NASA Technical Reports Server (NTRS)

    Mavriplis, D. J.

    1992-01-01

    The use of unstructured mesh techniques for solving complex aerodynamic flows is discussed. The principle advantages of unstructured mesh strategies, as they relate to complex geometries, adaptive meshing capabilities, and parallel processing are emphasized. The various aspects required for the efficient and accurate solution of aerodynamic flows are addressed. These include mesh generation, mesh adaptivity, solution algorithms, convergence acceleration, and turbulence modeling. Computations of viscous turbulent two-dimensional flows and inviscid three-dimensional flows about complex configurations are demonstrated. Remaining obstacles and directions for future research are also outlined.

  16. Adaptive Mesh Refinement in CTH

    SciTech Connect

    Crawford, David

    1999-05-04

    This paper reports progress on implementing a new capability of adaptive mesh refinement into the Eulerian multimaterial shock- physics code CTH. The adaptivity is block-based with refinement and unrefinement occurring in an isotropic 2:1 manner. The code is designed to run on serial, multiprocessor and massive parallel platforms. An approximate factor of three in memory and performance improvements over comparable resolution non-adaptive calculations has-been demonstrated for a number of problems.

  17. Mesh networked unattended ground sensors

    NASA Astrophysics Data System (ADS)

    Colling, Kent; Calcutt, Wade; Winston, Mark; Jones, Barry

    2006-05-01

    McQ has developed a family of low cost unattended ground sensors that utilize self-configured, mesh network communications for wireless sensing. Intended for use in an urban environment, the area monitored by the sensor system poses a communication challenge. A discussion into the sensor's communication performance and how it affects sensor installation and the operation of the system once deployed is presented.

  18. SHARP/PRONGHORN Interoperability: Mesh Generation

    SciTech Connect

    Avery Bingham; Javier Ortensi

    2012-09-01

    Progress toward collaboration between the SHARP and MOOSE computational frameworks has been demonstrated through sharing of mesh generation and ensuring mesh compatibility of both tools with MeshKit. MeshKit was used to build a three-dimensional, full-core very high temperature reactor (VHTR) reactor geometry with 120-degree symmetry, which was used to solve a neutron diffusion critical eigenvalue problem in PRONGHORN. PRONGHORN is an application of MOOSE that is capable of solving coupled neutron diffusion, heat conduction, and homogenized flow problems. The results were compared to a solution found on a 120-degree, reflected, three-dimensional VHTR mesh geometry generated by PRONGHORN. The ability to exchange compatible mesh geometries between the two codes is instrumental for future collaboration and interoperability. The results were found to be in good agreement between the two meshes, thus demonstrating the compatibility of the SHARP and MOOSE frameworks. This outcome makes future collaboration possible.

  19. Automatic Mesh Coarsening for Discrete Ordinates Codes

    SciTech Connect

    Turner, Scott A.

    1999-03-11

    This paper describes the use of a ''mesh potential'' function for automatic coarsening of meshes in discrete ordinates neutral particle transport codes. For many transport calculations, a user may find it helpful to have the code determine a ''good'' neutronics mesh. The complexity of a problem involving millions of mesh cells, dozens of materials, and many energy groups makes it difficult to determine an adequate level of mesh refinement with a minimum number of cells. A method has been implemented in PARTISN (Parallel Time-dependent SN) to calculate a ''mesh potential'' in each original cell of a problem, and use this information to determine the maximum coarseness allowed in the mesh while maintaining accuracy in the solution. Results are presented for a simple x-y-z fuel/control/reflector problem.

  20. Bioprosthetic Mesh in Abdominal Wall Reconstruction

    PubMed Central

    Baumann, Donald P.; Butler, Charles E.

    2012-01-01

    Mesh materials have undergone a considerable evolution over the last several decades. There has been enhancement of biomechanical properties, improvement in manufacturing processes, and development of antiadhesive laminate synthetic meshes. The evolution of bioprosthetic mesh materials has markedly changed our indications and methods for complex abdominal wall reconstruction. The authors review the optimal properties of bioprosthetic mesh materials, their evolution over time, and their indications for use. The techniques to optimize outcomes are described using bioprosthetic mesh for complex abdominal wall reconstruction. Bioprosthetic mesh materials clearly have certain advantages over other implantable mesh materials in select indications. Appropriate patient selection and surgical technique are critical to the successful use of bioprosthetic materials for abdominal wall repair. PMID:23372454

  1. Parallelization of irregularly coupled regular meshes

    NASA Technical Reports Server (NTRS)

    Chase, Craig; Crowley, Kay; Saltz, Joel; Reeves, Anthony

    1992-01-01

    Regular meshes are frequently used for modeling physical phenomena on both serial and parallel computers. One advantage of regular meshes is that efficient discretization schemes can be implemented in a straight forward manner. However, geometrically-complex objects, such as aircraft, cannot be easily described using a single regular mesh. Multiple interacting regular meshes are frequently used to describe complex geometries. Each mesh models a subregion of the physical domain. The meshes, or subdomains, can be processed in parallel, with periodic updates carried out to move information between the coupled meshes. In many cases, there are a relatively small number (one to a few dozen) subdomains, so that each subdomain may also be partitioned among several processors. We outline a composite run-time/compile-time approach for supporting these problems efficiently on distributed-memory machines. These methods are described in the context of a multiblock fluid dynamics problem developed at LaRC.

  2. Local, Optimization-based Simplicial Mesh Smoothing

    1999-12-09

    OPT-MS is a C software package for the improvement and untangling of simplicial meshes (triangles in 2D, tetrahedra in 3D). Overall mesh quality is improved by iterating over the mesh vertices and adjusting their position to optimize some measure of mesh quality, such as element angle or aspect ratio. Several solution techniques (including Laplacian smoothing, "Smart" Laplacian smoothing, optimization-based smoothing and several combinations thereof) and objective functions (for example, element angle, sin (angle), and aspectmore » ratio) are available to the user for both two and three-dimensional meshes. If the mesh contains invalid elements (those with negative area) a different optimization algorithm for mesh untangling is provided.« less

  3. The Effect of Thickness and Mesh Spacing on the Impact Resistance of Ferrocement Slab

    NASA Astrophysics Data System (ADS)

    Che Muda, Zakaria; Ashraful Alam, Md; Syamsir, Agusril; Sulleman, Sorefan; Beddu, Salmia; Nasharuddin Mustapha, Kamal; Thiruchelvam, Sivadass; Ismail, Firas B.; Usman, Fathoni; Liyana Mohd Kamal, Nur; Birima, Ahmed H.; Itam, Zarina; Zaroog, O. S.

    2016-03-01

    This paper investigates the effect of the thickness and mesh spacing on the impact of ferrocement for the concrete slab of 300mm x 300mm size reinforced subjected to low impact projectile test. A self-fabricated drop-weight impact test rig with a steel ball weight of 1.236 kg drop at height of 150 mm, 350mm, and 500mm has been used in this research work. The objective of this research is to study the relationship of impact resistance of ferrocement against slab thickness and mesh reinforcement spacing. There is a good linear correlation between impact resistance of ferrocement against slab thickness and its mesh spacing. The first and ultimate crack impact resistance for 40 mm slab are 2.00 times and 1.84 times respectively against the 20 mm slab with the same mesh spacing. The first and ultimate crack impact resistance for 40 mm slab with 20 mm mesh spacing are 2.24 times and 3.70 times respectively against 50 mm mesh spacing with the same slab thickness. The mesh with higher content of reinforcement provides more contribution to the slab resistance as compare with the thickness.

  4. Word Root Translation of 45,564 Autopsy Reports into MeSH Titles

    PubMed Central

    Moore, G. William; Hutchins, Grover M.; Boitnott, John K.; Miller, Robert E.; Polacsek, Richard A.

    1987-01-01

    It has become increasingly cost-effective to produce primary medical records as electronic documents. However, access to these documents by disease-concept is limited by the user's knowledge of the classification system (ICD, SNOMED, MeSH). We have developed a system of algorithmic translation between medical natural language and MeSH titles, by respelling common word roots. Using the list of 17,494 words harvested from all autopsies performed at The Johns Hopkins Hospital between May 28, 1889, and June 30, 1987, a set of 2,310 respelling formulas converted 10,200 words into 659 distinct MeSH titles. Results show that respelling formulas can be used to translate medical natural language into MeSH titles, and thus improve the access to the database.

  5. Mesh for prolapse surgery: Why the fuss?

    PubMed

    Rajshekhar, Smita; Mukhopadhyay, Sambit; Klinge, Uwe

    2015-06-01

    Pelvic organ prolapse is a common gynaecological problem. Surgical techniques to repair prolapse have been constantly evolving to reduce the recurrence of prolapse and need for reoperation. Grafts made of synthetic and biological materials became popular in the last decade as they were intended to provide extra support to native tissue repairs. However, serious complications related to use of synthetic meshes have been reported and there is increasing medico-legal concern about mesh use in prolapse surgery. Some mesh products already have been withdrawn from the market and the FDA has introduced stricter surveillance of new and existing products. Large randomized studies comparing mesh with non-mesh procedures are lacking which creates uncertainty for the surgeon and their patients.The small cohorts of the RCTs available with short follow-up periods just allow the conclusion that the mesh repair can be helpful in the short to medium term but unfortunately are not able to prove safety for all patients. In particular, current clinical reports cannot define for which indication what material may be superior compared to non-mesh repair.Quality control through long-term individual and national mesh registries is needed to keep a record of all surgeons using mesh and all devices being used, monitoring their effectiveness and safety data. Meshes with better biocompatibility designed specifically for use in vaginal surgery may provide superior clinical results, where the reduction of complications may allow a wider range of indications. PMID:25952907

  6. Illinois drainage water management demonstration project

    USGS Publications Warehouse

    Pitts, D.J.; Cooke, R.; Terrio, P.J.

    2004-01-01

    Due to naturally high water tables and flat topography, there are approximately 4 million ha (10 million ac) of farmland artificially drained with subsurface (tile) systems in Illinois. Subsurface drainage is practiced to insure trafficable field conditions for farm equipment and to reduce crop stress from excess water within the root zone. Although drainage is essential for economic crop production, there have been some significant environmental costs. Tile drainage systems tend to intercept nutrient (nitrate) rich soil-water and shunt it to surface water. Data from numerous monitoring studies have shown that a significant amount of the total nitrate load in Illinois is being delivered to surface water from tile drainage systems. In Illinois, these drainage systems are typically installed without control mechanisms and allow the soil to drain whenever the water table is above the elevation of the tile outlet. An assessment of water quality in the tile drained areas of Illinois showed that approximately 50 percent of the nitrate load was being delivered through the tile systems during the fallow period when there was no production need for drainage to occur. In 1998, a demonstration project to introduce drainage water management to producers in Illinois was initiated by NRCS4 An initial aspect of the project was to identify producers that were willing to manage their drainage system to create a raised water table during the fallow (November-March) period. Financial assistance from two federal programs was used to assist producers in retrofitting the existing drainage systems with control structures. Growers were also provided guidance on the management of the structures for both water quality and production benefits. Some of the retrofitted systems were monitored to determine the effect of the practice on water quality. This paper provides background on the water quality impacts of tile drainage in Illinois, the status of the demonstration project, preliminary

  7. Illinois Early Learning Project Tip Sheets: Parenting and Family Life.

    ERIC Educational Resources Information Center

    2003

    The Illinois Early Learning Project (IEL) is funded by the Illinois State Board of Education to provide information resources on early learning and training related to implementing the Illinois Early Learning Standards for parents and for early childhood personnel in all settings. The IEL tip sheets offer suggestions to parents and early childhood…

  8. Literacy: Celebration and Challenge. Illinois Reading Council Silver Anniversary Monograph.

    ERIC Educational Resources Information Center

    Johns, Jerry L., Ed.; And Others

    Celebrating the Illinois Reading Council's 25th anniversary year, this 2-part monograph presents 11 papers on diverse aspects of reading and literacy. Papers in the first part, called "Historical Reflections and Challenges," are: "The Illinois Reading Council Celebrates 25 Years" (John W. Logan); "The 'Illinois Reading Council Journal':…

  9. Illinois Early Learning Project Tip Sheets: Physical Development and Health.

    ERIC Educational Resources Information Center

    2003

    The Illinois Early Learning Project (IEL) is funded by the Illinois State Board of Education to provide information resources on early learning and training related to implementing the Illinois Early Learning Standards for parents and for early childhood personnel in all settings. The IEL tip sheets offer suggestions to parents and early childhood…

  10. 1. SOUTH AND WEST ELEVATION OF ILLINOIS PURE ALUMINUM (IPA) ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    1. SOUTH AND WEST ELEVATION OF ILLINOIS PURE ALUMINUM (IPA) COMPANY FACTORY; SOUTH ELEVATION FACING ILLINOIS CENTRAL GULF RAILROAD TRACKS AND MAIN STREET. THE ONE-STORY BRICK BUILDING TO THE LEFT IS AN ABANDONED COMMONWEALTH EDISON COMPANY ELECTRICAL SUBSTATION. - Illinois Pure Aluminum Company, 109 Holmes Street, Lemont, Cook County, IL

  11. Action Goals for the Seventies. An Agenda for Illinois Education.

    ERIC Educational Resources Information Center

    Illinois State Office of the Superintendent of Public Instruction, Springfield.

    Six regional Illinois public hearings, involving Illinois educators, students, parents, and community organizations, were held during the summer of 1971, and resulted in a wealth of information and testimony about Illinois education. Subsequently, a draft document specifying priority goals for state education was compiled and circulated to…

  12. Illinois Early Learning Project Tip Sheets: Language Arts.

    ERIC Educational Resources Information Center

    2003

    The Illinois Early Learning Project (IEL) is funded by the Illinois State Board of Education to provide information resources on early learning and training related to implementing the Illinois Early Learning Standards for parents and for early childhood personnel in all settings. The IEL tip sheets offer suggestions to parents and early childhood…

  13. Illinois Occupational Skill Standards: Agricultural Sales and Marketing Cluster.

    ERIC Educational Resources Information Center

    Illinois Occupational Skill Standards and Credentialing Council, Carbondale.

    This document, which is intended to serve as a guide for work force preparation program providers, details the Illinois occupational skill standards for programs preparing students for employment in jobs in agricultural sales and marketing. Agency partners involved in this project include: the Illinois State Board of Education, Illinois Community…

  14. Illinois Community College System Results Report, Fiscal Year 2002.

    ERIC Educational Resources Information Center

    Illinois Community Coll. Board, Springfield.

    This report details the ways in which the Illinois Community College System is addressing its strategic plan, "Promise for Illinois," for fiscal year 2002. Illinois has 39 community college districts and one multi-community college center that serve nearly one million students a year. The report identifies the following six goals: (1) economic…

  15. Measuring Music Education: Music Education Assessment in Illinois

    ERIC Educational Resources Information Center

    Cangro, Richard M.

    2014-01-01

    There are many assessment initiatives and policy changes happening in Illinois concerning learning and teaching expectations that involve K-12 students, teacher candidates, and current teachers. The Illinois State Board of Education has adopted new Math and English Language Arts standards for K-12 education known as the "New Illinois State…

  16. Harms titanium mesh cage fracture

    PubMed Central

    Klezl, Zdenek; Bookland, Markus J.; Wolinsky, Jean-Paul; Rezek, Zdenek; Gokaslan, Ziya L.

    2007-01-01

    Interbody fusion has become a mainstay of surgical management for lumbar fractures, tumors, spondylosis, spondylolisthesis and deformities. Over the years, it has undergone a number of metamorphoses, as novel instrumentation and approaches have arisen to reduce complications and enhance outcomes. Interbody fusion procedures are common and successful, complications are rare and most often do not involve the interbody device itself. We present here a patient who underwent an anterior L4 corpectomy with Harms cage placement and who later developed a fracture of the lumbar titanium mesh cage (TMC). This report details the presentation and management of this rare complication, as well as discusses the biomechanics underlying this rare instrumentation failure. PMID:17497187

  17. Mesh networking optimized for robotic teleoperation

    NASA Astrophysics Data System (ADS)

    Hart, Abraham; Pezeshkian, Narek; Nguyen, Hoa

    2012-06-01

    Mesh networks for robot teleoperation pose different challenges than those associated with traditional mesh networks. Unmanned ground vehicles (UGVs) are mobile and operate in constantly changing and uncontrollable environments. Building a mesh network to work well under these harsh conditions presents a unique challenge. The Manually Deployed Communication Relay (MDCR) mesh networking system extends the range of and provides non-line-of-sight (NLOS) communications for tactical and explosive ordnance disposal (EOD) robots currently in theater. It supports multiple mesh nodes, robots acting as nodes, and works with all Internet Protocol (IP)-based robotic systems. Under MDCR, the performance of different routing protocols and route selection metrics were compared resulting in a modified version of the Babel mesh networking protocol. This paper discusses this and other topics encountered during development and testing of the MDCR system.

  18. Nanoscience Research Internships in Illinois

    SciTech Connect

    Kronshage, Alisa

    2013-08-31

    NanoBusiness Talent Project Summary Report The NanoBusiness Alliance created the NanoBusiness Talent Program to ensure the future vitality of domestic scientists and entrepreneurs by engaging advanced high school students in cutting-edge nanotechnology development. This program commenced on September 1, 2008 and ran through August 31, 2010 with a very successful group of students. Several of these students went on to Stanford, Harvard and Yale, as well as many other prestigious Universities. We were able to procure the cooperation of several companies over the entire run of the program to voluntarily intern students at their companies and show them the possibilities that exist for their future. Companies ranged from NanoInk and Nanosphere to QuesTek and NanoIntegris all located in northern Illinois. During the 9-week internships, students worked at nanotechnology companies studying different ways in which nanotechnology is used for both commercial and consumer use. The students were both excited and invigorated at the prospect of being able to work with professional scientists in fields that previously may have just been a dream or an unreachable goal. All the students worked closely with mentors from each company to learn different aspects of procedures and scientific projects that they then used to present to faculty, parents, mentors and directors of the program at the end of each year’s program. The presentations were extremely well received and professionally created. We were able to see how much the students learned and absorbed through the course of their internships. During the last year of the program, we reached out to both North Carolina and Colorado high school students and received an extraordinary amount of applications. There were also numerous companies that were not only willing but excited at the prospect to engage highly intelligent high school students and to encourage them into the nanotechnology scientific field. Again, this program increase

  19. Unstructured Polyhedral Mesh Thermal Radiation Diffusion

    SciTech Connect

    Palmer, T.S.; Zika, M.R.; Madsen, N.K.

    2000-07-27

    Unstructured mesh particle transport and diffusion methods are gaining wider acceptance as mesh generation, scientific visualization and linear solvers improve. This paper describes an algorithm that is currently being used in the KULL code at Lawrence Livermore National Laboratory to solve the radiative transfer equations. The algorithm employs a point-centered diffusion discretization on arbitrary polyhedral meshes in 3D. We present the results of a few test problems to illustrate the capabilities of the radiation diffusion module.

  20. Auto-adaptive finite element meshes

    NASA Technical Reports Server (NTRS)

    Richter, Roland; Leyland, Penelope

    1995-01-01

    Accurate capturing of discontinuities within compressible flow computations is achieved by coupling a suitable solver with an automatic adaptive mesh algorithm for unstructured triangular meshes. The mesh adaptation procedures developed rely on non-hierarchical dynamical local refinement/derefinement techniques, which hence enable structural optimization as well as geometrical optimization. The methods described are applied for a number of the ICASE test cases are particularly interesting for unsteady flow simulations.

  1. Floating shock fitting via Lagrangian adaptive meshes

    NASA Technical Reports Server (NTRS)

    Vanrosendale, John

    1995-01-01

    In recent work we have formulated a new approach to compressible flow simulation, combining the advantages of shock-fitting and shock-capturing. Using a cell-centered on Roe scheme discretization on unstructured meshes, we warp the mesh while marching to steady state, so that mesh edges align with shocks and other discontinuities. This new algorithm, the Shock-fitting Lagrangian Adaptive Method (SLAM), is, in effect, a reliable shock-capturing algorithm which yields shock-fitted accuracy at convergence.

  2. Examination of Illinois Superintendents' Perceptions of the Illinois School Superintendent Content-Area Standards and Performance Indicators

    ERIC Educational Resources Information Center

    Demory, Christine E.

    2011-01-01

    This study examines Illinois school superintendents' perceived importance of the Illinois school superintendent content area standards and performance indicators. This study is significant because it provides an opportunity for rigorous reflection in identifying Illinois school superintendents' perceived importance of superintendent…

  3. Design of electrospinning mesh devices

    NASA Astrophysics Data System (ADS)

    Russo, Giuseppina; Peters, Gerrit W. M.; Solberg, Ramon H. M.; Vittoria, Vittoria

    2012-07-01

    This paper describes the features of new membranes that can act as local biomedical devices owing to their peculiar shape in the form of mesh structure. These materials are designed to provide significant effects to reduce local inflammations and improve the tissue regeneration. Lamellar Hydrotalcite loaded with Diclofenac Sodium (HTLc-DIK) was homogenously dispersed inside a polymeric matrix of Poly-caprolactone (PCL) to manufacture membranes by electrospinning technique. The experimental procedure and the criteria employed have shown to be extremely effective at increasing potentiality and related applications. The employed technique has proved to be very useful to manufacture polymeric fibers with diameters in the range of nano-micro scale. In this work a dedicated collector based on a proprietary technology of IME Technologies and Eindhoven University of Technology (TU/e) was used. It allowed to obtain devices with a macro shape of a 3D-mesh. Atomic Force Microscopy (AFM) highlights a very interesting texture of the electrospun fibers. They show a lamellar morphology that is only slightly modified by the inclusion of the interclay embedded in the devices to control the drug release phenomena.

  4. Mesh infrastructure for coupled multiprocess geophysical simulations

    SciTech Connect

    Garimella, Rao V.; Perkins, William A.; Buksas, Mike W.; Berndt, Markus; Lipnikov, Konstantin; Coon, Ethan; Moulton, John D.; Painter, Scott L.

    2014-01-01

    We have developed a sophisticated mesh infrastructure capability to support large scale multiphysics simulations such as subsurface flow and reactive contaminant transport at storage sites as well as the analysis of the effects of a warming climate on the terrestrial arctic. These simulations involve a wide range of coupled processes including overland flow, subsurface flow, freezing and thawing of ice rich soil, accumulation, redistribution and melting of snow, biogeochemical processes involving plant matter and finally, microtopography evolution due to melting and degradation of ice wedges below the surface. In addition to supporting the usual topological and geometric queries about the mesh, the mesh infrastructure adds capabilities such as identifying columnar structures in the mesh, enabling deforming of the mesh subject to constraints and enabling the simultaneous use of meshes of different dimensionality for subsurface and surface processes. The generic mesh interface is capable of using three different open source mesh frameworks (MSTK, MOAB and STKmesh) under the hood allowing the developers to directly compare them and choose one that is best suited for the application's needs. We demonstrate the results of some simulations using these capabilities as well as present a comparison of the performance of the different mesh frameworks.

  5. Mesh infrastructure for coupled multiprocess geophysical simulations

    DOE PAGESBeta

    Garimella, Rao V.; Perkins, William A.; Buksas, Mike W.; Berndt, Markus; Lipnikov, Konstantin; Coon, Ethan; Moulton, John D.; Painter, Scott L.

    2014-01-01

    We have developed a sophisticated mesh infrastructure capability to support large scale multiphysics simulations such as subsurface flow and reactive contaminant transport at storage sites as well as the analysis of the effects of a warming climate on the terrestrial arctic. These simulations involve a wide range of coupled processes including overland flow, subsurface flow, freezing and thawing of ice rich soil, accumulation, redistribution and melting of snow, biogeochemical processes involving plant matter and finally, microtopography evolution due to melting and degradation of ice wedges below the surface. In addition to supporting the usual topological and geometric queries about themore » mesh, the mesh infrastructure adds capabilities such as identifying columnar structures in the mesh, enabling deforming of the mesh subject to constraints and enabling the simultaneous use of meshes of different dimensionality for subsurface and surface processes. The generic mesh interface is capable of using three different open source mesh frameworks (MSTK, MOAB and STKmesh) under the hood allowing the developers to directly compare them and choose one that is best suited for the application's needs. We demonstrate the results of some simulations using these capabilities as well as present a comparison of the performance of the different mesh frameworks.« less

  6. RGG: Reactor geometry (and mesh) generator

    SciTech Connect

    Jain, R.; Tautges, T.

    2012-07-01

    The reactor geometry (and mesh) generator RGG takes advantage of information about repeated structures in both assembly and core lattices to simplify the creation of geometry and mesh. It is released as open source software as a part of the MeshKit mesh generation library. The methodology operates in three stages. First, assembly geometry models of various types are generated by a tool called AssyGen. Next, the assembly model or models are meshed by using MeshKit tools or the CUBIT mesh generation tool-kit, optionally based on a journal file output by AssyGen. After one or more assembly model meshes have been constructed, a tool called CoreGen uses a copy/move/merge process to arrange the model meshes into a core model. In this paper, we present the current state of tools and new features in RGG. We also discuss the parallel-enabled CoreGen, which in several cases achieves super-linear speedups since the problems fit in available RAM at higher processor counts. Several RGG applications - 1/6 VHTR model, 1/4 PWR reactor core, and a full-core model for Monju - are reported. (authors)

  7. Mesh plug repair and groin hernia surgery.

    PubMed

    Robbins, A W; Rutkow, I M

    1998-12-01

    Since the mid-1980s, dramatic progress has been made in the evolution of hernia surgery, highlighted by the increasing use of prosthetic mesh. Among the mesh-based "tension-free" hernioplasties, the use of mesh plugs has garnered a large number of spirited enthusiasts, and plug herniorrhaphy has become the fastest growing hernia repair currently employed by the American surgeon. To demonstrate the simplicity and effectiveness of mesh plugs, a 9-year experience with almost 3300 patients is reported. Technical details are discussed and presentation of a literature search serves to further emphasize the utilitarian nature of this elegantly unsophisticated surgical operation. PMID:9927981

  8. Method of generating a surface mesh

    DOEpatents

    Shepherd, Jason F.; Benzley, Steven; Grover, Benjamin T.

    2008-03-04

    A method and machine-readable medium provide a technique to generate and modify a quadrilateral finite element surface mesh using dual creation and modification. After generating a dual of a surface (mesh), a predetermined algorithm may be followed to generate and modify a surface mesh of quadrilateral elements. The predetermined algorithm may include the steps of generating two-dimensional cell regions in dual space, determining existing nodes in primal space, generating new nodes in the dual space, and connecting nodes to form the quadrilateral elements (faces) for the generated and modifiable surface mesh.

  9. Conformal refinement of unstructured quadrilateral meshes

    SciTech Connect

    Garmella, Rao

    2009-01-01

    We present a multilevel adaptive refinement technique for unstructured quadrilateral meshes in which the mesh is kept conformal at all times. This means that the refined mesh, like the original, is formed of only quadrilateral elements that intersect strictly along edges or at vertices, i.e., vertices of one quadrilateral element do not lie in an edge of another quadrilateral. Elements are refined using templates based on 1:3 refinement of edges. We demonstrate that by careful design of the refinement and coarsening strategy, we can maintain high quality elements in the refined mesh. We demonstrate the method on a number of examples with dynamically changing refinement regions.

  10. Low-dispersion meshes for scattering problems

    SciTech Connect

    Hakula, H.

    1996-12-31

    For scattering problems, e.g. the Helmholtz equation, the ideal mesh in 2D is a structured mesh of equilateral triangles, since the numerical dispersion and internal reflections caused by the mesh are then minimal. However, if the scattering body does not conform to the mesh, one has to add unstructured elements to the mesh. In this paper we describe a simple modification to the Rebay`s method which leads to meshes of high quality in the context of the application. Even though the Rebay`s method is a variant of Delaunay algorithms, it does include the concept of a front. By controlling the generation of fronts in the mesh we can always choose the outer boundary of the computational domain so that the mesh will be structured far from the scattering body and the only anisotropic elements are close to the body. As a result of this, one can use the same generator both for electromagnetic and flow simulations in 2D. In multi-body configurations the meshes are intimately dependent on the relative distances between the bodies.

  11. Science: issues in Illinois (reprints of science columns from Illinois Issues, February 1980-May 1981)

    SciTech Connect

    Not Available

    1981-08-01

    This report consists of reprints on current public policy issues involving science and technology (S and T) in the State of Illinois. The reprints include monthly science columns from February 1980 - May 1981 Illinois Issues, a magazine of state public affairs. The magazine is an outgrowth of a legislative science research annual --a compilation of S and T-related reports prepared for the Illinois General Assembly. Topics include waste oil recovery, nuclear safety, decontamination of nuclear reactors, sulfur dioxide levels, acid rain, radioactive waste disposal problems, Illinois' legislature's record on S and T, paternity blood testing, DMSO, science issues of the 80's, European solutions to nuclear wastes, Scientific Creationism versus the theory of evolution, drug paraphernalia definition, Reye's Syndrome, and Agent Orange.

  12. MOAB : a mesh-oriented database.

    SciTech Connect

    Tautges, Timothy James; Ernst, Corey; Stimpson, Clint; Meyers, Ray J.; Merkley, Karl

    2004-04-01

    A finite element mesh is used to decompose a continuous domain into a discretized representation. The finite element method solves PDEs on this mesh by modeling complex functions as a set of simple basis functions with coefficients at mesh vertices and prescribed continuity between elements. The mesh is one of the fundamental types of data linking the various tools in the FEA process (mesh generation, analysis, visualization, etc.). Thus, the representation of mesh data and operations on those data play a very important role in FEA-based simulations. MOAB is a component for representing and evaluating mesh data. MOAB can store structured and unstructured mesh, consisting of elements in the finite element 'zoo'. The functional interface to MOAB is simple yet powerful, allowing the representation of many types of metadata commonly found on the mesh. MOAB is optimized for efficiency in space and time, based on access to mesh in chunks rather than through individual entities, while also versatile enough to support individual entity access. The MOAB data model consists of a mesh interface instance, mesh entities (vertices and elements), sets, and tags. Entities are addressed through handles rather than pointers, to allow the underlying representation of an entity to change without changing the handle to that entity. Sets are arbitrary groupings of mesh entities and other sets. Sets also support parent/child relationships as a relation distinct from sets containing other sets. The directed-graph provided by set parent/child relationships is useful for modeling topological relations from a geometric model or other metadata. Tags are named data which can be assigned to the mesh as a whole, individual entities, or sets. Tags are a mechanism for attaching data to individual entities and sets are a mechanism for describing relations between entities; the combination of these two mechanisms is a powerful yet simple interface for representing metadata or application

  13. STS-56 ESC Earth observation of Chicago, Illinois at night

    NASA Technical Reports Server (NTRS)

    1993-01-01

    STS-56 electronic still camera (ESC) Earth observation image shows Chicago, Illinois with part of the shoreline of Lake Michigan at night as photographed during orbit 33 from Discovery, Orbiter Vehicle (OV) 103. The image was recorded with an image intensifier on the Hand-held, Earth-oriented, Real-time, Cooperative, User-friendly, Location-targeting and Environmental System (HERCULES). HERCULES is a device that makes it simple for shuttle crewmembers to take pictures of Earth as they merely point a modified 35mm camera and shoot any interesting feature, whose latitude and longitude are automatically determined in real-time. Center coordinates of this frame are 41.8 degrees north latitude and 87.7 degrees west longitude. The image was acquired at 1/60-second shutter speed and -2/3 exposure compensation. Digital file name is ESC03032.IMG.

  14. STS-56 ESC Earth observation of Chicago, Illinois at night

    NASA Technical Reports Server (NTRS)

    1993-01-01

    STS-56 electronic still camera (ESC) Earth observation image shows Chicago, Illinois with part of the shoreline of Lake Michigan at night as photographed during orbit 33 from Discovery, Orbiter Vehicle (OV) 103. The image was recorded with an image intensifier on the Hand-held, Earth-oriented, Real-time, Cooperative, User-friendly, Location-targeting and Environmental System (HERCULES). HERCULES is a device that makes it simple for shuttle crewmembers to take pictures of Earth as they merely point a modified 35mm camera and shoot any interesting feature, whose latitude and longitude are automatically determined in real-time. Center coordinates of this frame are 41.8 degrees north latitude and 87.7 degrees west longitude. The image was acquired at 1/60-second shutter speed and -2/3 exposure compensation. Digital file name is ESC03031.IMG.

  15. Analysis of nutrients, selected inorganic constituents, and trace elements in water from Illinois community-supply wells, 1984-91

    USGS Publications Warehouse

    Warner, Kelly L.

    2000-01-01

    The lower Illinois River Basin (LIRB) study unit is part of the National Water-Quality Assessment program that includes studies of most major aquifer systems in the United States. Retrospective water-quality data from community-supply wells in the LIRB and in the rest of Illinois are grouped by aquifer and depth interval. Concentrations of selected chemical constituents in water samples from community-supply wells within the LIRB vary with aquifer and depth of well. Ranked data for 16 selected trace elements and nutrients are compared by aquifer, depth interval, and between the LIRB and the rest of Illinois using nonparametric statistical analyses. For all wells, median concentrations of nitrate and nitrite (as Nitrogen) are highest in water samples from the Quaternary aquifer at well depths less than 100 ft; ammonia concentrations (as Nitrogen), however, are highest in samples from well depths greater than 200 ft. Chloride and sulfate concentrations are higher in samples from the older bedrock aquifers. Arsenic, lead, sulfate, and zinc concentrations are appreciably different between samples from the LIRB and samples from the rest of Illinois for ground water from the Quaternary aquifer. Arsenic concentration is highest in the deep Quaternary aquifer. Chromium, cyanide, lead, and mercury are not frequently detected in water samples from community-supply wells in Illinois.

  16. Geophysical constraints on understanding the origin of the Illinois basin and its underlying crust

    USGS Publications Warehouse

    McBride, J.H.; Kolata, Dennis R.; Hildenbrand, T.G.

    2003-01-01

    Interpretation of reprocessed seismic reflection profiles reveals three highly coherent, layered, unconformity-bounded sequences that overlie (or are incorporated within) the Proterozoic "granite-rhyolite province" beneath the Paleozoic Illinois basin and extend down into middle crustal depths. The sequences, which are situated in east-central Illinois and west-central Indiana, are bounded by strong, laterally continuous reflectors that are mappable over distances in excess of 200 km and are expressed as broad "basinal" packages that become areally more restricted with depth. Normal-fault reflector offsets progressively disrupt the sequences with depth along their outer margins. We interpret these sequences as being remnants of a Proterozoic rhyolitic caldera complex and/or rift episode related to the original thermal event that produced the granite-rhyolite province. The overall thickness and distribution of the sequences mimic closely those of the overlying Mt. Simon (Late Cambrian) clastic sediments and indicate that an episode of localized subsidence was underway before deposition of the post-Cambrian Illinois basin stratigraphic succession, which is centered farther south over the "New Madrid rift system" (i.e., Reelfoot rift and Rough Creek graben). The present configuration of the Illinois basin was therefore shaped by the cumulative effects of subsidence in two separate regions, the Proterozoic caldera complex and/or rift in east-central Illinois and west-central Indiana and the New Madrid rift system to the south. Filtered isostatic gravity and magnetic intensity data preclude a large mafic igneous component to the crust so that any Proterozoic volcanic or rift episode must not have tapped deeply or significantly into the lower crust or upper mantle during the heating event responsible for the granite-rhyolite. ?? 2002 Elsevier Science B.V. All rights reserved.

  17. Report on Illinois Public Community College Foundations.

    ERIC Educational Resources Information Center

    Illinois Community Coll. Board, Springfield.

    At the request of the Illinois Community College Board's (ICCB's) Committee on Foundations, the ICCB surveyed the state's public community college district to determine the purposes, resources, and activities of the colleges' foundations. The study found that all of the community college districts, except one, have foundations to assist them in…

  18. Illinois Association for Gifted Children Journal, 2003.

    ERIC Educational Resources Information Center

    Smutny, Joan Franklin, Ed.

    2003-01-01

    This issue of the Illinois Association for Gifted Children (IAGC) Journal focuses on curriculum. Featured articles include: (1) "Curriculum: What Is It? How Do You Know if It Is Quality?" (Sally Walker); (2) "Tiered Lessons: What Are Their Benefits and Applications?" (Carol Ann Tomlinson); (3) "Do Gifted and Talented Youth Get Counseling, Models,…

  19. Illinois Occupational Skill Standards: Medical Office Cluster.

    ERIC Educational Resources Information Center

    Illinois Occupational Skill Standards and Credentialing Council, Carbondale.

    These skill standards, developed through a consortium of educational and industry partners in Illinois, serve as guides to workforce preparation program providers to define content for their programs and to employers to establish the skills and standards necessary for job acquisition and performance. The skill standards include the following…

  20. Illinois: The State and Its Educational System.

    ERIC Educational Resources Information Center

    Hodgkinson, Harold L.

    Illinois, a large and predominantly urban state, is growing very slowly. It has not done well in creating new jobs; manufacturing jobs declined more and service jobs increased less than nationwide. The state is, however, a national leader in beef, hog, and soybean production. Chicago, in addition to being the financial capital of the Midwest, is…

  1. Illinois occultation summary, 1. 1977 - 1978

    NASA Technical Reports Server (NTRS)

    Radick, R.; Lien, D.

    1980-01-01

    Instrumentation and data acquisition techniques used to record lunar occultations at the University of Illinois Prairie Observatory are described. Tables and graphs summarize data from 64 events which include 30 observations of stars brighter than 7th magnitude, 40 reappearances, 4 angular diameter measurements, 8 observations of binary stars, and 6 observations which may indicate multiplicity.

  2. Illinois Association for Gifted Children Journal, 2000.

    ERIC Educational Resources Information Center

    Smutney, Joan Franklin, Ed.

    2000-01-01

    This issue of the Illinois Association for Gifted Children (IAGC) Journal focuses on teaching gifted children in the regular education classroom. Featured articles include: (1) "Educating All Gifted Children for the 21st Century: Proposal for Training Regular Classroom Teachers" (Maurice D. Fisher and Michael E. Walters); (2) "Gifted Children in…

  3. Illinois Community College Board Policy Manual.

    ERIC Educational Resources Information Center

    Illinois Community Coll. Board, Springfield.

    The fifth in a series of revised editions since 1967, this 1978 manual provides policy guidelines for Illinois public community colleges. Chapter 1 covers the state college board definitions relative to community college operations policy. Chapter 2 deals with board operation and general policies according to such topics as power and duties;…

  4. Illinois Occupational Skill Standards: Dental Hygienist.

    ERIC Educational Resources Information Center

    Illinois Occupational Skill Standards and Credentialing Council, Carbondale.

    These Illinois skill standards for dental hygienists are intended to serve as a guide to workforce preparation program providers as they define content for their programs and to employers as they establish the skills and standards necessary for job acquisition. They could also serve as a mechanism for communication among education, business,…

  5. Assessing Inefficiencies in Illinois School Districts.

    ERIC Educational Resources Information Center

    Genge, Fred C.

    Findings of a study that incorporated a method for measuring the economic efficiency of K-8 school districts in Illinois are presented in this paper. The quadriform concept was used to identify four categories, or quadrants, for identifying school districts--technically efficient, low service, high service, and technically inefficient. The method…

  6. Music Technology in Illinois Public Schools.

    ERIC Educational Resources Information Center

    Reese, Sam; Rimington, James

    2000-01-01

    Investigates the status of music technology in Illinois public schools (K-12) using a questionnaire. Focuses on (1) the perceived training needs of teachers, (2) ways teachers and students use technology, (3) access to music technology, (4) types of software and hardware, and (5) sources of funding. Addresses the implications. (CMK)

  7. Illinois Occupational Skill Standards: Accounting Services Cluster.

    ERIC Educational Resources Information Center

    Illinois Occupational Skill Standards and Credentialing Council, Carbondale.

    These Illinois skill standards for the accounting services cluster are intended to serve as a guide to workforce preparation program providers as they define content for their programs and to employers as they establish the skills and standards necessary for job acquisition. They could also serve as a mechanism for communication among education,…

  8. Illinois Occupational Skill Standards: Nursing Cluster.

    ERIC Educational Resources Information Center

    Illinois Occupational Skill Standards and Credentialing Council, Carbondale.

    These skill standards, developed through a consortium of educational and industry partners in Illinois, serve as guides to workforce preparation program providers to define content for their programs and to employers to establish the skills and standards necessary for job acquisition and performance. The skill standards include the following…

  9. Illinois Occupational Skill Standards: Press Operations Cluster.

    ERIC Educational Resources Information Center

    Illinois Occupational Skill Standards and Credentialing Council, Carbondale.

    These skill standards, developed through a consortium of educational and industry partners in Illinois, serve as guides to workforce preparation program providers to define content for their programs and to employers to establish the skills and standards necessary for job acquisition and performance. The skill standards include the following…

  10. Mathematics Placement at the University of Illinois

    ERIC Educational Resources Information Center

    Ahlgren Reddy, Alison; Harper, Marc

    2013-01-01

    Data from the ALEKS-based placement program at the University of Illinois is presented visually in several ways. The placement exam (an ALEKS assessment) contains precise item-specific information and the data show many interesting properties of the student populations of the placement courses, which include Precalculus, Calculus, and Business…

  11. Mapping karst regions of Illinois: Preliminary results

    SciTech Connect

    Weibel, C.P.; Panno, S.V. )

    1993-03-01

    Groundwater contamination may be significant in shallow aquifers in the parts of Illinois where karst occurs. Problems with ground-water contamination in shallow aquifers in karst areas may be significant in parts of Illinois. A study is underway to study factors that contribute to karst development and to map the karst areas of the state, including areas where obvious diagnostic karst geomorphic features are absent. The following generalizations can be made about the structural and stratigraphic factors that control the extent and maturity of karst areas and the development of karstic terrain in Illinois: (1) karstification is restricted to the flanks of the Illinois Basin because most of the basin interior contains carbonate-poor Pennsylvanian bedrock; (2) karstic terrain generally occurs in thick, flatlying, carbonate-rich lithologic units; (3) carbonate to non-carbonate facies changes in formations and the presence of disconformities affect the degree of karstification; (4) structures (folds, faults) may either increase or decrease the likelihood of karstification; and (5) karstification is potentially greater in areas where overlying regolith is absent or thin.

  12. Illinois Occupational Skill Standards: Welding Cluster.

    ERIC Educational Resources Information Center

    Illinois Occupational Skill Standards and Credentialing Council, Carbondale.

    These Illinois skill standards for the welding cluster are intended to serve as a guide to workforce preparation program providers as they define content for their programs and to employers as they establish the skills and standards necessary for job acquisition. They could also serve as a mechanism for communication among education, business,…

  13. [Illinois Career Development Month Ideas and Activities.

    ERIC Educational Resources Information Center

    Illinois State Board of Education, Springfield.

    This document is intended to help practitioners plan and implement activities for observance of Career Development Month in Illinois. Part 1 examines the following topics: the definitions of career development and education-to-careers; the rationale for devoting a month to career development; a career framework; and suggested Career Development…

  14. An Atlas of Illinois State University Affairs.

    ERIC Educational Resources Information Center

    Sublett, Michael D., Ed.; And Others

    Twelve reports on the spatial patterns present on the campus of Illinois State University are divided into three sections. Following an introduction, the first section focuses on behavioral patterns such as seating choices made in the university cafeteria or the classroom. Section II deals with the measures people take to save time. A microstudy…

  15. Illinois Occupational Skill Standards: Dental Assistant.

    ERIC Educational Resources Information Center

    Illinois Occupational Skill Standards and Credentialing Council, Carbondale.

    These Illinois skill standards for dental assistant are intended to serve as a guide to workforce preparation program providers as they define content for their programs and to employers as the establish the skills and standards necessary for job acquisition. They could also serve as a mechanism for communication among education, business,…

  16. Illinois Occupational Skill Standards: Banking Cluster.

    ERIC Educational Resources Information Center

    Illinois Occupational Skill Standards and Credentialing Council, Carbondale.

    These Illinois skill standards for the banking cluster are intended to serve as a guide to workforce preparation program providers as they define content for their programs and to employers as they establish the skills and standards necessary for job acquisition. They could also serve as a mechanism for communication among education, business,…

  17. Illinois Occupational Skill Standards: Swine Production Cluster.

    ERIC Educational Resources Information Center

    Illinois Occupational Skill Standards and Credentialing Council, Carbondale.

    This document contains 52 Occupational Skill Standards for the swine production occupational cluster, as required for the state of Illinois. Skill Standards, which were developed by committees that included educators, business, industry, and labor, are intended to promote education and training investment and ensure that students and workers are…

  18. Computer Activities in Illinois Secondary Schools.

    ERIC Educational Resources Information Center

    Dennis, J. Richard; And Others

    A brief, non-technical questionnaire was sent to 875 secondary school administrators (primarily principals) in the State of Illinois. Information was collected in four areas: (1) general school characteristics, (2) availability and use of computers, (3) perceived need for and qualifications of teachers of computer science, and (4) perceived need…

  19. Substitutes for School Nurses in Illinois

    ERIC Educational Resources Information Center

    Vollinger, Linda Jeno; Bergren, Martha Dewey; Belmonte-Mann, Frances

    2011-01-01

    The purpose of this descriptive study was to explore utilization of nurse substitutes in the school setting in Illinois. The literature described personnel who staff the school health office in the absence of the school nurse and the barriers to obtaining nurse substitutes. There were no empirical studies conducted on school nurse substitutes in…

  20. Patterns in Illinois educational school data

    NASA Astrophysics Data System (ADS)

    Stevens, Cacey S.; Marder, Michael; Nagel, Sidney R.

    2015-06-01

    We examine Illinois educational data from standardized exams and analyze primary factors affecting the achievement of public school students. We focus on the simplest possible models: representation of data through visualizations and regressions on single variables. Exam scores are shown to depend on school type, location, and poverty concentration. For most schools in Illinois, student test scores decline linearly with poverty concentration. However, Chicago must be treated separately. Selective schools in Chicago, as well as some traditional and charter schools, deviate from this pattern based on poverty. For any poverty level, Chicago schools perform better than those in the rest of Illinois. Selective programs for gifted students show high performance at each grade level, most notably at the high school level, when compared to other Illinois school types. The case of Chicago charter schools is more complex. Up to 2008, Chicago charter and neighborhood schools had similar performance scores. In the last few years, charter students' scores overtook those of students in traditional schools as the number of charter school locations increased.

  1. Security in the Public Libraries of Illinois.

    ERIC Educational Resources Information Center

    Lorenzen, Michael

    1997-01-01

    A survey of Illinois public libraries found that: security was a problem (58%); material theft was a problem (56%); periodical mutilation was a problem (42%); and a patron or staff member was expelled or arrested in the previous year (26%). Discusses perceptions of security, security incidents, electronic security systems, and security policies.…

  2. Emergency Food Providers in Southern Illinois.

    ERIC Educational Resources Information Center

    O'Hara, Mary

    This paper examines emergency food provider networks in rural southern Illinois. An overview focuses on recent research reports on hunger in America, official federal emergency food assistance policy and criticisms of that policy, and the role of the private sector in emergency food distribution. The review details the disagreements on policy and…

  3. Patterns in Illinois Educational School Data

    ERIC Educational Resources Information Center

    Stevens, Cacey S.; Marder, Michael; Nagel, Sidney R.

    2015-01-01

    We examine Illinois educational data from standardized exams and analyze primary factors affecting the achievement of public school students. We focus on the simplest possible models: representation of data through visualizations and regressions on single variables. Exam scores are shown to depend on school type, location, and poverty…

  4. Predicting School Referenda Outcomes: Answers from Illinois.

    ERIC Educational Resources Information Center

    Lentz, Corliss

    1999-01-01

    Uses ordinary least-squares multivariate regression analysis to determine if jurisdictional types vary in their willingness to increase taxation for schools, employing 892 education fund referenda conducted in Illinois from 1981 to 1989. Outcomes do differ by jurisdiction type. The strongest predictor is willingness to pay for higher taxes. (29…

  5. Consumer Education in Illinois Schools, 1986.

    ERIC Educational Resources Information Center

    Illinois State Board of Education, Springfield.

    Intended to assist Illinois teachers in planning an instructional program in consumer education that meets state requirements, this consumer education curriculum is designed to help students in grades 9 through 12: (1) become informed consumers; (2) understand the rights and responsibilities of consumers in society; (3) develop responsible…

  6. Current Illinois Legal Issues. Second Edition.

    ERIC Educational Resources Information Center

    Kopecky, Frank J., Ed.; Wilkin, Rebecca S., Ed.

    Designed as supplementary reading in American government or social studies courses, this compilation of articles is intended to help students gain a better understanding of the judiciary's role in the Illinois legal system. The first of three sections contains articles about judges and the court system. The second section examines the criminal…

  7. Illinois Council for the Gifted Journal, 1992.

    ERIC Educational Resources Information Center

    Smutny, Joan Franklin, Ed.

    1992-01-01

    This annual issue of the Illinois Council for the Gifted Journal includes 20 articles focusing on young gifted children. Titles and authors are: "How Can I Tell If My Preschooler is Gifted?" (Susan Golant); "Early Childhood Education for the Gifted: The Need for Intense Study and Observation" (Maurice Fisher); "Assessing Gifted and Talented…

  8. Subgroup Achievement and Gap Trends: Illinois

    ERIC Educational Resources Information Center

    Center on Education Policy, 2010

    2010-01-01

    In grade 8 (the only grade in which subgroup trends were analyzed by achievement level), Illinois students showed mostly gains in both reading and math at the basic, proficient, and advanced levels for racial/ethnic subgroups, low income students, and boys and girls. There was mixed progress made in narrowing achievement gaps in reading and math…

  9. State Summary of Illinois. Ed Watch Online.

    ERIC Educational Resources Information Center

    Education Trust, Washington, DC.

    This report provides data on the academic achievement gap that separates low-income and minority students from other students, examining how well different groups of students perform in Illinois and noting inequities in teacher quality, course offerings, and funding. Included are tables and data that provide: student profile (the demographic…

  10. Reverse Transfer Students in Illinois Community Colleges.

    ERIC Educational Resources Information Center

    Kajstura, Alex; Keim, Marybelle C.

    1992-01-01

    Describes a study of 525 students attending an Illinois community college having previously attended a 4-year college. Reports findings on reverse transfers' demographic and academic background, reasons for leaving the four-year institution and enrolling in a two-year college, primary educational goal, and evaluation of their educational…

  11. The Illinois Public Community College Board Members.

    ERIC Educational Resources Information Center

    Petty, Gary Frank; Piland, William E.

    1985-01-01

    Details findings of a 1983 survey conducted to provide a demographic and political profile of trustees representing the 39 Illinois community college districts. Finds trustees' seats dominated by politically conservative, middle- and upper-middle-class White males, although recent trends are toward more female, minority, aggressive, visible, and…

  12. Handbook for Cooperative Vocational Education in Illinois.

    ERIC Educational Resources Information Center

    Northern Illinois Univ., De Kalb.

    Suggestions for this handbook were gathered from teacher-coordinators and administrators of cooperative vocational education in the state of Illinois and from publications depicting exemplary practices in other states. It is designed for use by both administrators and teacher-coordinators and is structured around the most commonly asked questions…

  13. Illinois Quality Schools Index: Manual and Instruments.

    ERIC Educational Resources Information Center

    Illinois State Board of Education, Springfield. Program Planning and Development Section.

    The Illinois Quality School Index (IQSI) is a school survey designed to assist local school personnel in planning for more effective schools. The IQSI provides a structure to determine the existing quality and the expected quality of the school as viewed by administration, staff, parents, and community. This manual is a detailed guide for using…

  14. Deriving Appropriate Educational Program Costs in Illinois.

    ERIC Educational Resources Information Center

    Parrish, Thomas B.; Chambers, Jay G.

    This document describes the comprehensive analytical framework for school finance used by the Illinois State Board of Education to assist policymakers in their decisions about equitable distribution of state aid and appropriate levels of resources to meet the varying educational requirements of differing student populations. This framework, the…

  15. LEVEL III AND IV ECOREGIONS OF ILLINOIS

    EPA Science Inventory

    The ecoregions of Illinois have been identified, mapped, and described; they provide a geographic structure for environmental resources research, assessment, monitoring, and management. This project is part of a larger effort by the U.S. EPA to create a national, hierarchical ec...

  16. Illinois Association for Gifted Children Journal, 2002.

    ERIC Educational Resources Information Center

    Smutny, Joan Franklin, Ed.

    2002-01-01

    This issue of the Illinois Association for Gifted Children (IAGC) Journal focuses on creativity. Featured articles include: (1) "Creativity: What Is It? and What Does It Look Like" (Sally Y. Walker); (2) "What Is Creativity?" (Debbie Cho); (3) "Creativity and Underachievement" (Sylvia Rimm); (4) "Stacy Hayden: Creativity-One Mother's Perspective"…

  17. Illinois Occupational Skill Standards: Insurance Cluster.

    ERIC Educational Resources Information Center

    Illinois Occupational Skill Standards and Credentialing Council, Carbondale.

    This document contains 56 occupational skill standards for the insurance occupational cluster, as required for the state of Illinois. Skill standards, which were developed by committees that included educators and representatives from business, industry, and labor, are intended to promote education and training investment and ensure that students…

  18. Illinois Occupational Skill Standards: Housekeeping Management Cluster.

    ERIC Educational Resources Information Center

    Illinois Occupational Skill Standards and Credentialing Council, Carbondale.

    This document contains 44 occupational skill standards for the housekeeping management occupational cluster, as required for the state of Illinois. Skill standards, which were developed by committees that included educators and representatives from business, industry, and labor, are intended to promote education and training investment and ensure…

  19. Teacher Hiring Practices: Illinois Principals' Perspectives

    ERIC Educational Resources Information Center

    Kersten, Thomas

    2008-01-01

    A growing body of research has confirmed the link between excellent teachers and increased student achievement and school success. Consequently, selecting outstanding teachers is critical. This study examines Illinois principals' teacher hiring practices as well as their perceptions of what teachers do to enhance or hinder their selection.…

  20. Illinois Articulation Initiative: Policy and Procedures Manual.

    ERIC Educational Resources Information Center

    Illinois State Board of Higher Education, Springfield.

    This Policy and Procedures Manual was prepared by the Illinois Articulation Initiative (IAI) Technical Task Force to assist college and university administrators, faculty members, and other staff participating in the IAI. The preface contains background information on the IAI, whose goal is to facilitate inter-institutional transfer, and its…

  1. Energy Conservation Featured in Illinois High School

    ERIC Educational Resources Information Center

    Modern Schools, 1976

    1976-01-01

    The William Fremd High School in Palatine, Illinois, scheduled to open in 1977, is being built with energy conservation uppermost in mind. In this system, 70 heat pumps will heat and cool 300,000 square feet of educational facilities. (Author/MLF)

  2. Choosing corners of rectangles for mapped meshing

    SciTech Connect

    Mitchell, S.A.

    1996-12-16

    Consider mapping a regular i x j quadrilateral mesh of a rectangle onto a surface. The quality of the mapped mesh of the surface depends heavily on which vertices of the surface correspond to corners of the rectangle. The authors problem is, given an n-sided surface, chose as corners four vertices such that the surface resembles a rectangle with corners at those vertices. Note that n could be quite large, and the length and width of the rectangle, i and j, are not prespecified. In general, there is either a goal number or a prescribed number of mesh edges for each bounding curve of the surface. The goals affect the quality of the mesh, and the prescribed edges may make finding a feasible set of corners difficult. The algorithm need only work for surfaces that are roughly rectangular, particular those without large reflex angles, as otherwise an unstructured meshing algorithm is used instead. The authors report on the theory and implementation of algorithms for this problem. They also given an overview of a solution to a related problem called interval assignment: given a complex of surfaces sharing curves, globally assign the number of mesh edges or intervals for each curve such that it is possible to mesh each surface according to its prescribed quadrilateral meshing algorithm, and assigned and user-prescribed boundary mesh edges and corners. They also note a practical, constructive technique that relies on interval assignment that can generate a quadrilateral mesh of a complex of surfaces such that a compatible hexahedral mesh of the enclosed volume exists.

  3. Chemical analyses of surface water in Illinois, 1958-74; Volume II, Illinois River basin and Mississippi River tributaries north of Illinois River basin

    USGS Publications Warehouse

    Healy, R.W.; Toler, L.G.

    1978-01-01

    Samples of surface water were collected and analyzed by the Illinois Environmental Protection Agency and its predecessor, the Stream Pollution Control Bureau of the Illinois Department of Public Health. The results for the period 1958 to 1974 are presented in tabular form and the history of sampling and analytical methods are included for all sites where samples were collected at gaging stations or near enough that reliable discharge estimates could be made. The report is contained in three volumes. This volume (Volume II) includes Illinois River basin and Mississippi River tributaries north of Illinois River basin. (See also W78-10034 and W78-10036) (Woodard-USGS)

  4. Adaptive mesh refinement in titanium

    SciTech Connect

    Colella, Phillip; Wen, Tong

    2005-01-21

    In this paper, we evaluate Titanium's usability as a high-level parallel programming language through a case study, where we implement a subset of Chombo's functionality in Titanium. Chombo is a software package applying the Adaptive Mesh Refinement methodology to numerical Partial Differential Equations at the production level. In Chombo, the library approach is used to parallel programming (C++ and Fortran, with MPI), whereas Titanium is a Java dialect designed for high-performance scientific computing. The performance of our implementation is studied and compared with that of Chombo in solving Poisson's equation based on two grid configurations from a real application. Also provided are the counts of lines of code from both sides.

  5. History of late glacial flow through the middle Mississippi and Illinois Valleys

    SciTech Connect

    Hajic, E.R. ) Bettis, E.A. III )

    1992-01-01

    Nearly the entire late glacial is represented by the sedimentologic, stratigraphic and geomorphic record. Sources and types of discharge and sediment varied considerably in response to style and timing of retreat and readvance of glacial lobes; drainage diversions; magnitude and timing of glacial lake discharges; and non-meltwater inputs. Sedimentology of backflood, slackwater, and tributary and main stem fluvial sediments associated with late Wisconsinan terraces, preserved in Mississippi tributary valley mouths, suggests that from before 16,000 until about 13,300 B.P., when the valleys were undergoing net aggradation during ice retreat, floods were of relatively small to moderate magnitude. Catastrophic flooding out of moraine--dammed lakes occurred down the Illinois Valley between about 16,000 and 15,500 B.P., and down the Mississippi Valley out of Lake Wisconsin around 15,000 B.P. Large-scale, but not necessarily catastrophic, paleochannels in the Illinois Valley were active at least intermittently between 15,500 and about 9,800 B.P. After about 12,200 B.P., the character of Mississippi River discharge changed greatly. Between 12,200 and about 9,500 B.P., multiple relatively large magnitude floods, some catastrophic, from Lake Agassiz, Des Moines lobe englacial or subglacial lakes, and other glacial lakes, passed through the valley causing downcutting, terrace formation, and locally extensive valley widening and left remnants of large-scale paleochannels and streamlined bars. Either catastrophic floods did not pass through the Illinois Valley after 13,300 B.P. or they were sharply attenuated by the time they reached the lower valley; the reverse sloping clayey surface of the Savanna Terrace and associated lacustrine deposits in the lower Illinois Valley show no depositional or erosional evidence suggestive of modification by catastrophic flooding.

  6. Parallel mesh management using interoperable tools.

    SciTech Connect

    Tautges, Timothy James; Devine, Karen Dragon

    2010-10-01

    This presentation included a discussion of challenges arising in parallel mesh management, as well as demonstrated solutions. They also described the broad range of software for mesh management and modification developed by the Interoperable Technologies for Advanced Petascale Simulations (ITAPS) team, and highlighted applications successfully using the ITAPS tool suite.

  7. Conforming quadrilaterals meshes on the cubed sphere.

    SciTech Connect

    Taylor, Mark A.; Levy, Michael Nathan; Overfelt, James Robert

    2010-08-01

    The cubed sphere geometry, obtained by inscribing a cube in a sphere and mapping points between the two surfaces using a gnomonic (central) projection, is commonly used in atmospheric models because it is free of polar singularities and is well-suited for parallel computing. Global meshes on the cubed-sphere typically project uniform (square) grids from each face of the cube onto the sphere, and if refinement is desired then it is done with non-conforming meshes - overlaying the area of interest with a finer uniform mesh, which introduces so-called hanging nodes on edges along the boundary of the fine resolution area. An alternate technique is to tile each face of the cube with quadrilaterals without requiring the quads to be rectangular. These meshes allow for refinement in areas of interest with a conforming mesh, providing a smoother transition between high and low resolution portions of the grid than non-conforming refinement. The conforming meshes are demonstrated in HOMME, NCAR's High Order Method Modeling Environment, where two modifications have been made: the dependence on uniform meshes has been removed, and the ability to read arbitrary quadrilateral meshes from a previously-generated file has been added. Numerical results come from a conservative spectral element method modeling a selection of the standard shallow water test cases.

  8. Computational results for parallel unstructured mesh computations

    SciTech Connect

    Jones, M.T.; Plassmann, P.E.

    1994-12-31

    The majority of finite element models in structural engineering are composed of unstructured meshes. These unstructured meshes are often very large and require significant computational resources; hence they are excellent candidates for massively parallel computation. Parallel solution of the sparse matrices that arise from such meshes has been studied heavily, and many good algorithms have been developed. Unfortunately, many of the other aspects of parallel unstructured mesh computation have gone largely ignored. The authors present a set of algorithms that allow the entire unstructured mesh computation process to execute in parallel -- including adaptive mesh refinement, equation reordering, mesh partitioning, and sparse linear system solution. They briefly describe these algorithms and state results regarding their running-time and performance. They then give results from the 512-processor Intel DELTA for a large-scale structural analysis problem. These results demonstrate that the new algorithms are scalable and efficient. The algorithms are able to achieve up to 2.2 gigaflops for this unstructured mesh problem.

  9. 7th International Meshing Roundtable '98

    SciTech Connect

    Eldred, T.J.

    1998-10-01

    The goal of the 7th International Meshing Roundtable is to bring together researchers and developers from industry, academia, and government labs in a stimulating, open environment for the exchange of technical information related to the meshing process. In the past, the Roundtable has enjoyed significant participation from each of these groups from a wide variety of countries.

  10. Structured mesh generation with smoothness controls

    Technology Transfer Automated Retrieval System (TEKTRAN)

    In geometrically complex domains, the RL (Ryskin and Leal) orthogonal mesh generation system may cause mesh distortion and overlapping problems when using the “weak constraint” method with specified boundary point distribution for all boundaries. To resolve these problems, an improved RL system with...

  11. 21 CFR 878.3300 - Surgical mesh.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ... 21 Food and Drugs 8 2014-04-01 2014-04-01 false Surgical mesh. 878.3300 Section 878.3300 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GENERAL AND PLASTIC SURGERY DEVICES Prosthetic Devices § 878.3300 Surgical mesh. (a)...

  12. 21 CFR 878.3300 - Surgical mesh.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ... 21 Food and Drugs 8 2011-04-01 2011-04-01 false Surgical mesh. 878.3300 Section 878.3300 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GENERAL AND PLASTIC SURGERY DEVICES Prosthetic Devices § 878.3300 Surgical mesh. (a)...

  13. English 200: Intermediate Composition

    ERIC Educational Resources Information Center

    Ritter, Kelly

    2005-01-01

    "English 200: Intermediate Composition" is a program elective for English majors and a writing-intensive elective for nonmajors at Southern Connecticut State University (SCSU), a comprehensive institution of 11,000 undergraduate and graduate (master's level) students. English 200 is described in the departmental course catalog as a course "in…

  14. Feature recognition applications in mesh generation

    SciTech Connect

    Tautges, T.J.; Liu, S.S.; Lu, Y.; Kraftcheck, J.; Gadh, R.

    1997-06-01

    The use of feature recognition as part of an overall decomposition-based hexahedral meshing approach is described in this paper. The meshing approach consists of feature recognition, using a c-loop or hybrid c-loop method, and the use of cutting surfaces to decompose the solid model. These steps are part of an iterative process, which proceeds either until no more features can be recognized or until the model has been completely decomposed into meshable sub-volumes. This method can greatly reduce the time required to generate an all-hexahedral mesh, either through the use of more efficient meshing algorithms on more of the geometry or by reducing the amount of manual decomposition required to mesh a volume.

  15. Mesh deformation based on artificial neural networks

    NASA Astrophysics Data System (ADS)

    Stadler, Domen; Kosel, Franc; Čelič, Damjan; Lipej, Andrej

    2011-09-01

    In the article a new mesh deformation algorithm based on artificial neural networks is introduced. This method is a point-to-point method, meaning that it does not use connectivity information for calculation of the mesh deformation. Two already known point-to-point methods, based on interpolation techniques, are also presented. In contrast to the two known interpolation methods, the new method does not require a summation over all boundary nodes for one displacement calculation. The consequence of this fact is a shorter computational time of mesh deformation, which is proven by different deformation tests. The quality of the deformed meshes with all three deformation methods was also compared. Finally, the generated and the deformed three-dimensional meshes were used in the computational fluid dynamics numerical analysis of a Francis water turbine. A comparison of the analysis results was made to prove the applicability of the new method in every day computation.

  16. Modified mesh-connected parallel computers

    SciTech Connect

    Carlson, D.A. )

    1988-10-01

    The mesh-connected parallel computer is an important parallel processing organization that has been used in the past for the design of supercomputing systems. In this paper, the authors explore modifications of a mesh-connected parallel computer for the purpose of increasing the efficiency of executing important application programs. These modifications are made by adding one or more global mesh structures to the processing array. They show how our modifications allow asymptotic improvements in the efficiency of executing computations having low to medium interprocessor communication requirements (e.g., tree computations, prefix computations, finding the connected components of a graph). For computations with high interprocessor communication requirements such as sorting, they show that they offer no speedup. They also compare the modified mesh-connected parallel computer to other similar organizations including the pyramid, the X-tree, and the mesh-of-trees.

  17. A comparison of tetrahedral mesh improvement techniques

    SciTech Connect

    Freitag, L.A.; Ollivier-Gooch, C.

    1996-12-01

    Automatic mesh generation and adaptive refinement methods for complex three-dimensional domains have proven to be very successful tools for the efficient solution of complex applications problems. These methods can, however, produce poorly shaped elements that cause the numerical solution to be less accurate and more difficult to compute. Fortunately, the shape of the elements can be improved through several mechanisms, including face-swapping techniques that change local connectivity and optimization-based mesh smoothing methods that adjust grid point location. The authors consider several criteria for each of these two methods and compare the quality of several meshes obtained by using different combinations of swapping and smoothing. Computational experiments show that swapping is critical to the improvement of general mesh quality and that optimization-based smoothing is highly effective in eliminating very small and very large angles. The highest quality meshes are obtained by using a combination of swapping and smoothing techniques.

  18. 7 CFR 60.200 - Country of origin notification.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ... having an opportunity to observe the final package (e.g., Internet sales, home delivery sales, etc.), the...) designation either on the sales vehicle or at the time the product is delivered to the consumer....

  19. 7 CFR 60.200 - Country of origin notification.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ... having an opportunity to observe the final package (e.g., Internet sales, home delivery sales, etc.), the...) designation either on the sales vehicle or at the time the product is delivered to the consumer....

  20. 7 CFR 60.200 - Country of origin notification.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ... having an opportunity to observe the final package (e.g., Internet sales, home delivery sales, etc.), the...) designation either on the sales vehicle or at the time the product is delivered to the consumer....

  1. 7 CFR 60.200 - Country of origin notification.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ... having an opportunity to observe the final package (e.g., Internet sales, home delivery sales, etc.), the...) designation either on the sales vehicle or at the time the product is delivered to the consumer....

  2. Update on Development of Mesh Generation Algorithms in MeshKit

    SciTech Connect

    Jain, Rajeev; Vanderzee, Evan; Mahadevan, Vijay

    2015-09-30

    MeshKit uses a graph-based design for coding all its meshing algorithms, which includes the Reactor Geometry (and mesh) Generation (RGG) algorithms. This report highlights the developmental updates of all the algorithms, results and future work. Parallel versions of algorithms, documentation and performance results are reported. RGG GUI design was updated to incorporate new features requested by the users; boundary layer generation and parallel RGG support were added to the GUI. Key contributions to the release, upgrade and maintenance of other SIGMA1 libraries (CGM and MOAB) were made. Several fundamental meshing algorithms for creating a robust parallel meshing pipeline in MeshKit are under development. Results and current status of automated, open-source and high quality nuclear reactor assembly mesh generation algorithms such as trimesher, quadmesher, interval matching and multi-sweeper are reported.

  3. Automatic Mesh Generation of Hybrid Mesh on Valves in Multiple Positions in Feedline Systems

    NASA Technical Reports Server (NTRS)

    Ross, Douglass H.; Ito, Yasushi; Dorothy, Fredric W.; Shih, Alan M.; Peugeot, John

    2010-01-01

    Fluid flow simulations through a valve often require evaluation of the valve in multiple opening positions. A mesh has to be generated for the valve for each position and compounding. The problem is the fact that the valve is typically part of a larger feedline system. In this paper, we propose to develop a system to create meshes for feedline systems with parametrically controlled valve openings. Herein we outline two approaches to generate the meshes for a valve in a feedline system at multiple positions. There are two issues that must be addressed. The first is the creation of the mesh on the valve for multiple positions. The second is the generation of the mesh for the total feedline system including the valve. For generation of the mesh on the valve, we will describe the use of topology matching and mesh generation parameter transfer. For generation of the total feedline system, we will describe two solutions that we have implemented. In both cases the valve is treated as a component in the feedline system. In the first method the geometry of the valve in the feedline system is replaced with a valve at a different opening position. Geometry is created to connect the valve to the feedline system. Then topology for the valve is created and the portion of the topology for the valve is topology matched to the standard valve in a different position. The mesh generation parameters are transferred and then the volume mesh for the whole feedline system is generated. The second method enables the user to generate the volume mesh on the valve in multiple open positions external to the feedline system, to insert it into the volume mesh of the feedline system, and to reduce the amount of computer time required for mesh generation because only two small volume meshes connecting the valve to the feedline mesh need to be updated.

  4. Constrained CVT Meshes and a Comparison of Triangular Mesh Generators

    SciTech Connect

    Nguyen, Hoa; Burkardt, John; Gunzburger, Max; Ju, Lili; Saka, Yuki

    2009-01-01

    Mesh generation in regions in Euclidean space is a central task in computational science, and especially for commonly used numerical methods for the solution of partial differential equations, e.g., finite element and finite volume methods. We focus on the uniform Delaunay triangulation of planar regions and, in particular, on how one selects the positions of the vertices of the triangulation. We discuss a recently developed method, based on the centroidal Voronoi tessellation (CVT) concept, for effecting such triangulations and present two algorithms, including one new one, for CVT-based grid generation. We also compare several methods, including CVT-based methods, for triangulating planar domains. To this end, we define several quantitative measures of the quality of uniform grids. We then generate triangulations of several planar regions, including some having complexities that are representative of what one may encounter in practice. We subject the resulting grids to visual and quantitative comparisons and conclude that all the methods considered produce high-quality uniform grids and that the CVT-based grids are at least as good as any of the others.

  5. 24 CFR 200.200 - What is the Appraiser Roster?

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ... 24 Housing and Urban Development 2 2012-04-01 2012-04-01 false What is the Appraiser Roster? 200.200 Section 200.200 Housing and Urban Development Regulations Relating to Housing and Urban... HOUSING AND URBAN DEVELOPMENT GENERAL INTRODUCTION TO FHA PROGRAMS Appraiser Roster § 200.200 What is...

  6. 25 CFR 200.1-200.10 - [Reserved

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ... 25 Indians 1 2012-04-01 2011-04-01 true 200.1-200.10 Section 200.1-200.10 Indians BUREAU OF INDIAN AFFAIRS, DEPARTMENT OF THE INTERIOR ENERGY AND MINERALS TERMS AND CONDITIONS: COAL LEASES §§ 200.1-200.10...

  7. 25 CFR 200.1-200.10 - [Reserved

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ... 25 Indians 1 2013-04-01 2013-04-01 false 200.1-200.10 Section 200.1-200.10 Indians BUREAU OF INDIAN AFFAIRS, DEPARTMENT OF THE INTERIOR ENERGY AND MINERALS TERMS AND CONDITIONS: COAL LEASES §§ 200.1-200.10...

  8. 25 CFR 200.1-200.10 - [Reserved

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... 25 Indians 1 2010-04-01 2010-04-01 false 200.1-200.10 Section 200.1-200.10 Indians BUREAU OF INDIAN AFFAIRS, DEPARTMENT OF THE INTERIOR ENERGY AND MINERALS TERMS AND CONDITIONS: COAL LEASES §§ 200.1-200.10...

  9. 25 CFR 200.1-200.10 - [Reserved

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ... 25 Indians 1 2011-04-01 2011-04-01 false 200.1-200.10 Section 200.1-200.10 Indians BUREAU OF INDIAN AFFAIRS, DEPARTMENT OF THE INTERIOR ENERGY AND MINERALS TERMS AND CONDITIONS: COAL LEASES §§ 200.1-200.10...

  10. 25 CFR 200.1-200.10 - [Reserved

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ... 25 Indians 1 2014-04-01 2014-04-01 false 200.1-200.10 Section 200.1-200.10 Indians BUREAU OF INDIAN AFFAIRS, DEPARTMENT OF THE INTERIOR ENERGY AND MINERALS TERMS AND CONDITIONS: COAL LEASES §§ 200.1-200.10...

  11. Method of modifying a volume mesh using sheet extraction

    DOEpatents

    Borden, Michael J.; Shepherd, Jason F.

    2007-02-20

    A method and machine-readable medium provide a technique to modify a hexahedral finite element volume mesh using dual generation and sheet extraction. After generating a dual of a volume stack (mesh), a predetermined algorithm may be followed to modify the volume mesh of hexahedral elements. The predetermined algorithm may include the steps of determining a sheet of hexahedral mesh elements, generating nodes for merging, and merging the nodes to delete the sheet of hexahedral mesh elements and modify the volume mesh.

  12. Evaluation of Absorbable Mesh Fixation Devices at Various Deployment Angles

    PubMed Central

    Zihni, Ahmed M.; Cavallo, Jaime A.; Thompson, Dominic M.; Chowdhury, Nabeel H.; Frisella, Margaret M.; Matthews, Brent D.; Deeken, Corey R.

    2014-01-01

    BACKGROUND Hernia repair failure may occur due to suboptimal mesh fixation by mechanical constructs before mesh integration. Construct design and acute penetration angle may alter mesh-tissue fixation strength. We compared acute fixation strengths of absorbable fixation devices at various deployment angles, directions of loading, and construct orientations. METHODS Porcine abdominal walls were sectioned. Constructs were deployed at 30, 45, 60, and 90 degree angles to fix mesh to the tissue specimens. Lap-shear testing was performed in upward, downward, and lateral directions in relation to the abdominal wall cranial-caudal axis to evaluate fixation. Absorbatack™ (AT), SorbaFix™ (SF), and SecureStrap™ in vertical (SSV) and horizontal (SSH) orientations in relation to the abdominal wall cranial-caudal axis were tested. Ten tests were performed for each combination of device, angle, and loading direction. Failure types and strength data were recorded. ANOVA with Tukey-Kramer adjustments for multiple comparisons and chi-square tests were performed as appropriate (p<0.05 considered significant). RESULTS At 30 degrees, SSH and SSV had greater fixation strengths (12.95 N, 12.98 N, respectively) than SF (5.70 N; p=0.0057, p=0.0053, respectively). At 45 degrees, mean fixation strength of SSH was significantly greater than SF (18.14 N, 11.40 N; p=0.0002). No differences in strength were identified at 60 or 90 degrees. No differences in strength were noted between SSV and SSH with different directions of loading. No differences were noted between SS and AT at any angle. Immediate failure was associated with SF (p<0.0001) and the 30 degree tacking angle (p<0.01). CONCLUSIONS Mesh-tissue fixation was stronger at acute deployment angles with SS compared to SF constructs. The 30 degree angle and the SF device were associated with increased immediate failures. Varying construct and loading direction did not generate statistically significant differences in the fixation

  13. ESTIMATION OF NAVIGATION - DAM DISCHARGE IN ILLINOIS.

    USGS Publications Warehouse

    Weiss, Linda S.

    1987-01-01

    Techniques were used to estimate discharge for the Brandon Road Dam on the Des Plaines River and the Dresden Island, Marseilles, and Starved Rock Dams on the Illinois River in northern Illinois. Tainter gates are operated to regulate streamflow at all dams. Additionally, headgates are used for regulation of the Brandon Road Dam. Stage-discharge, gate-opening relations were developed from a total of 91 discharge measurements that range from 198 to 86,400 cubic feet per second (5. 6 to 2,450 cubic meters per second). Values for discharge coefficients, in equations that express discharge as a function of tailwater depth, headwater depth, and vertical height of gate opening, were determined for conditions of free-orifice, submerged-orifice, free-weir, and submerged-weir flow past a tainter gate.

  14. Absence of Altonian glaciation in Illinois

    USGS Publications Warehouse

    Curry, B. Brandon

    1989-01-01

    Illinois was free of glacier ice from about 130,000 to 25,000 yr B.P. Deposits of this time interval in northeastern Illinois, represented by core samples from test-hole ISGS S-30, are composed of leached, nonglacigenic, stratified, or pedoturbated silty sediments that typically are organic-rich and pedogenically modified. These deposits overlie the Sangamon Soil, which is identified by its stratigraphic position, soil morphology, and distinct alteration products in the clay-mineral fraction, including a variably swelling vermiculite-like phase and a randomly interstratified kaolinite/10 A?? phase. The regional extent of these deposits suggests that if Altonian ice existed in the Lake Michigan basin, it did not extend westward beyond the cuesta of Silurian dolomite that rims the southwestern shore of Lake Michigan. ?? 1989.

  15. Illinois scrap-tire management study

    SciTech Connect

    Wietting, N.E.

    1989-10-01

    Pursuant to the mandate under Public Act 85-1196 (HB 3389), the Illinois Department of Energy and Natural Resources initiated a study that reports on feasible methods for recycling of scrap motor vehicle tires which may be available to municipalities and counties. The study answers that mandate. It examines various methods for the recovery or reuse of motor vehicle tires. In addition, the study provides a detailed economic analysis of two alternative systems judged to be effective uses of scrap tires that can be implemented at this time. Finally, a discussion of policy issues is provided to assist the State of Illinois in determining which combination of uses and legislation would be an effective means of controlling the growing problem of scrap tires.

  16. Alcohol fuels in Illinois: prospects and implications

    SciTech Connect

    Rao, V.; Walzer, N.

    1981-10-01

    Because of the importance of corn to the Illinois economy, the use of corn in the production of fuel alcohol offered major economic benefits for the state. One of the advantages to Illinois resulting from the use of corn to produce ethanol was increased employment. Expansion of the alcohol fuels industry meant greater employment in the alcohol industry directly as well as increased employment in the industries indirectly involved in alcohol production. Finally, the increased income generated by the greater employment would create additional jobs throughout the economy. The increased employment which could result from an expansion of the alcohol fuels industry was estimated. The employment is estimated by first estimating the demand for gasoline and gasoline-alcohols fuels based on population and income trends. After the demand for gasoline-alcohol fuels has been estimated, the direct, indirect, and induced employment resulting from various market shares are determined.

  17. Illinois task force on global climate change

    SciTech Connect

    Griffin, B.S.

    1996-12-31

    The purpose of this report is to document progress in the areas of national policy development, emissions reduction, research and education, and adaptation, and to identify specific actions that will be undertaken to implement the Illinois state action plan. The task force has been tracking national and international climate change policy, and helping shape national policy agenda. Identification and implementation of cost-effective mitigation measures has been performed for emissions reduction. In the area of research and education, the task force is developing the capacity to measure climate change indicators, maintaining and enhancing Illinois relevant research, and strengthening climate change education. Activities relevant to adaptation to new policy include strengthening water laws and planning for adaptation. 6 figs., 4 tabs.

  18. Layered superhydrophobic meshes for controlled drug release.

    PubMed

    Falde, Eric J; Freedman, Jonathan D; Herrera, Victoria L M; Yohe, Stefan T; Colson, Yolonda L; Grinstaff, Mark W

    2015-09-28

    Layered superhydrophobic electrospun meshes composed of poly(ε-caprolactone) (PCL) and poly(glycerol monostearate-co-ε-caprolactone) (PGC-C18) are described as a local source of chemotherapeutic delivery. Specifically, the chemotherapeutic agent SN-38 is incorporated into a central 'core' layer, between two 'shield' layers of mesh without drug. This mesh is resistant to wetting of the surface and throughout the bulk due to the pronounced hydrophobicity imparted by the high roughness of a hydrophobic polymer, PGC-C18. In serum solution, these meshes exhibit slow initial drug release over 10days corresponding to media infiltrating the shield layer, followed by steady release over >30days, as the drug-loaded core layer is wetted. This sequence of events is supported by X-ray computed tomography imaging of a contrast agent solution infiltrating the mesh. In vitro cytotoxicity data collected with Lewis Lung Carcinoma (LLC) cells are consistent with this release profile, remaining cytotoxic for over 20days, longer than the unlayered version. Finally, after subcutaneous implantation in rats, histology of meshes with and without drug demonstrated good integration and lack of adverse reaction over 28days. The drug release rates, robust superhydrophobicity, in vitro cytotoxicity of SN-38 loaded meshes, and compatibility provide key design parameters for the development of an implantable chemotherapeutic-loaded device for the prevention of local lung cancer recurrence following surgical resection. PMID:26160309

  19. CYBER 200 Applications Seminar

    NASA Technical Reports Server (NTRS)

    Gary, J. P. (Compiler)

    1984-01-01

    Applications suited for the CYBER 200 digital computer are discussed. Various areas of application including meteorology, algorithms, fluid dynamics, monte carlo methods, petroleum, electronic circuit simulation, biochemistry, lattice gauge theory, economics and ray tracing are discussed.

  20. Tectonic history of the Illinois basin

    SciTech Connect

    Kolata, D.R.; Nelson, J.W. )

    1990-05-01

    The Illinois basin began as a failed rift that developed during breakup of a supercontinent approximately 550 Ma. A rift basin in the southernmost part of the present Illinois basin subsided rapidly and filled with about 3,000 m of probable Early and Middle Cambrian sediments. By the Late Cambrian, the rift-bounding faults became inactive and a broad relatively slowly subsiding embayment, extending well beyond the rift and open to the Iapetus Ocean, persisted through most of the Paleozoic Era. Widespread deformation swept through the proto-Illinois basin beginning in the latest Mississippian, continuing to the end of the Paleozoic Era. Uplift of basement fault blocks resulted in the formation of many major folds and faults. The timing of deformation and location of these structures in the forelands of the Ouachita and Alleghanian orogenic belts suggest that much of the deformation resulted from continental collision between North America and Gondwana. The associated compressional stress reactivated the ancient rift-bounding faults, upthrusting the northern edge of a crustal block approximately 1,000 m within the rift. Concurrently, dikes (radiometrically dated as Early Permian), sills, and explosion breccias formed in or adjacent to the reactivated rift. Subsequent extensional stress, probably associated with breakup of Pangea, caused the crustal block within the rift to sink back to near its original position. High-angle, northeast- to east-west-trending normal faults, with as much as 1,000 m of displacement, formed in the southern part of the basin. These faults displace some of the northwest trending Early Permian dikes. Structural closure of the southern end of the Illinois basin was caused by uplift of the Pascola arch sometime between the Late Pennsylvanian and Late Cretaceous.

  1. Southern Illinois and Western Kentucky, USA

    NASA Technical Reports Server (NTRS)

    1973-01-01

    This view of southern Illinois and Western Kentucky (37.0N, 88.5W), with the winding Ohio River in between also illustrates the rich agriculture potential of the flood plains in the river bottom lands. To the east are the waters of Lake Kentucky and Lake Barkley which flow into the Ohio at Paducah, KY and may be seen stretching for several miles. Except for the Land Between the Lakes State Park, Extensive agriculture may be seen throughout the area.

  2. Mesh optimization for microbial fuel cell cathodes constructed around stainless steel mesh current collectors

    NASA Astrophysics Data System (ADS)

    Zhang, Fang; Merrill, Matthew D.; Tokash, Justin C.; Saito, Tomonori; Cheng, Shaoan; Hickner, Michael A.; Logan, Bruce E.

    Mesh current collectors made of stainless steel (SS) can be integrated into microbial fuel cell (MFC) cathodes constructed of a reactive carbon black and Pt catalyst mixture and a poly(dimethylsiloxane) (PDMS) diffusion layer. It is shown here that the mesh properties of these cathodes can significantly affect performance. Cathodes made from the coarsest mesh (30-mesh) achieved the highest maximum power of 1616 ± 25 mW m -2 (normalized to cathode projected surface area; 47.1 ± 0.7 W m -3 based on liquid volume), while the finest mesh (120-mesh) had the lowest power density (599 ± 57 mW m -2). Electrochemical impedance spectroscopy showed that charge transfer and diffusion resistances decreased with increasing mesh opening size. In MFC tests, the cathode performance was primarily limited by reaction kinetics, and not mass transfer. Oxygen permeability increased with mesh opening size, accounting for the decreased diffusion resistance. At higher current densities, diffusion became a limiting factor, especially for fine mesh with low oxygen transfer coefficients. These results demonstrate the critical nature of the mesh size used for constructing MFC cathodes.

  3. Washability of trace elements in product coals from Illinois mines. Technical report, September 1--November 30, 1993

    SciTech Connect

    Demir, I.; Ruch, R.R.; Harvey, R.D.; Steele, J.D.

    1993-12-31

    The existing trace element washability data on Illinois coals are based on float-sink methods, and these data are not applicable to modern froth flotation or column flotation processes. Particularly, there is a lack of washability data on samples from modern preparation plants, as well as other product (as-shipped) coals. The goal of this project is to provide the needed trace element washability data on as-shipped coals that were collected during 1992--1993 from Illinois mines. The results generated by this project will promote Illinois coals for such prospective new markets as feed materials for advanced gasification processes, for synthetic organic chemicals, and to meet new environmental requirements for their use in utility steam generation. During the first quarter, each of 34 project samples were ground to about {approximately}100 mesh size and cleaned by use of a special froth flotation technique (release analysis). The flotation products were analyzed for ash, moisture, and heating value (BTU). The data were then used to construct a series of different-washability curves. For example, these curves can show variation in BTU or combustible recovery as a function of the amount of ash or S rejected, or as a function of the weight of the flotation products. From the relationship between %cumulative BTU and %cumulative weight, nine composite samples each having 80% of the total BTU were prepared from the individual flotation products and submitted for trace element analysis.

  4. Path coloring on the Mesh

    SciTech Connect

    Rabani, Y.

    1996-12-31

    In the minimum path coloring problem, we are given a list of pairs of vertices of a graph. We are asked to connect each pair by a colored path. Paths of the same color must be edge disjoint. Our objective is to minimize the number of colors used. This problem was raised by Aggarwal et al and Raghavan and Upfal as a model for routing in all-optical networks. It is also related to questions in circuit routing. In this paper, we improve the O (ln N) approximation result of Kleinberg and Tardos for path coloring on the N x N mesh. We give an O(1) approximation algorithm to the number of colors needed, and a poly(ln ln N) approximation algorithm to the choice of paths and colors. To the best of our knowledge, these are the first sub-logarithmic bounds for any network other than trees, rings, or trees of rings. Our results are based on developing new techniques for randomized rounding. These techniques iteratively improve a fractional solution until it approaches integrality. They are motivated by the method used by Leighton, Maggs, and Rao for packet routing.

  5. Algebraic surface design and finite element meshes

    NASA Technical Reports Server (NTRS)

    Bajaj, Chandrajit L.

    1992-01-01

    Some of the techniques are summarized which are used in constructing C sup 0 and C sup 1 continuous meshes of low degree, implicitly defined, algebraic surface patches in three dimensional space. These meshes of low degree algebraic surface patches are used to construct accurate computer models of physical objects. These meshes are also used in the finite element simulation of physical phenomena (e.g., heat dissipation, stress/strain distributions, fluid flow characteristics) required in the computer prototyping of both the manufacturability and functionality of the geometric design.

  6. SUPERFISH accuracy dependence on mesh size

    NASA Astrophysics Data System (ADS)

    Merson, J. L.; Boicourt, G. P.

    1989-02-01

    The RF cavity code SUPERFISH is extensively used for the design of drift-tube linac (DTL), radio-frequency quadrupole (RFQ), and coupled-cavity linac (CCL) structures. It has been known for some time that considerably finer meshes are required near the nose of a drift tube to ensure accurate calculation of the resonant frequency and related secondary quantities. This paper discusses the results of numerical experiments designed to provide rules to set proper mesh sizes for DTL, RFQ, and CCL problems. During this work, SUPERFISH problems involving more than 100,000 mesh points were solved.

  7. Abdominal wall reconstruction with implantable meshes.

    PubMed

    Masden, Derek; Felder, John M; Iorio, Matthew L; Bhanot, Parag; Attinger, Christopher E

    2011-01-01

    Abdominal wall defects present a difficult problem for the reconstructive surgeon. Over the years, numerous implantable materials have becomes available to aid the surgeon in recreating the abdominal wall. This spectrum of implants includes permanent synthetic meshes, absorbable meshes, composite meshes and biomaterials. This review includes the pros and cons for the commercially available abdominal wall implants as well as a review of the literature regarding outcomes for each material. This review will provide the surgeon with current evidence-based information on implantable abdominal materials to be able to make a more informed decision about which implant to use. PMID:21663579

  8. Application of mesh network radios to UGS

    NASA Astrophysics Data System (ADS)

    Calcutt, Wade; Jones, Barry; Roeder, Brent

    2008-04-01

    During the past five years McQ has been actively pursuing integrating and applying wireless mesh network radios as a communications solution for unattended ground sensor (UGS) systems. This effort has been rewarded with limited levels of success and has ultimately resulted in a corporate position regarding the use of mesh network radios for UGS systems. A discussion into the background of the effort, the challenges of implementing commercial off-the-shelf (COTS) mesh radios with UGSs, the tradeoffs involved, and an overview of the future direction is presented.

  9. H(curl) Auxiliary Mesh Preconditioning

    SciTech Connect

    Kolev, T V; Pasciak, J E; Vassilevski, P S

    2006-08-31

    This paper analyzes a two-level preconditioning scheme for H(curl) bilinear forms. The scheme utilizes an auxiliary problem on a related mesh that is more amenable for constructing optimal order multigrid methods. More specifically, we analyze the case when the auxiliary mesh only approximately covers the original domain. The latter assumption is important since it allows for easy construction of nested multilevel spaces on regular auxiliary meshes. Numerical experiments in both two and three space dimensions illustrate the optimal performance of the method.

  10. Engagement of Metal Debris into Gear Mesh

    NASA Technical Reports Server (NTRS)

    handschuh, Robert F.; Krantz, Timothy L.

    2010-01-01

    A series of bench-top experiments was conducted to determine the effects of metallic debris being dragged through meshing gear teeth. A test rig that is typically used to conduct contact fatigue experiments was used for these tests. Several sizes of drill material, shim stock and pieces of gear teeth were introduced and then driven through the meshing region. The level of torque required to drive the "chip" through the gear mesh was measured. From the data gathered, chip size sufficient to jam the mechanism can be determined.

  11. Traveltime and dispersion in the Illinois River, Marseilles to Peoria, Illinois

    USGS Publications Warehouse

    Zuehls, E.E.

    1987-01-01

    Traveltime in 89.3 mi of the Illinois River between Marseilles Dam and Peoria Dam was measured using rhodamine-WT dye. On each of four subreaches, dye-tracer measurements were made at approximately 50- and 85% flow duration in 1978, 1979, and 1985. The dye-tracer data were used to develop a method for estimating the traveltime and peak concentration of a solute spilled into the Illinois River. The estimates can apply to spills at any point within the study reach during a period of relatively steady discharge of from low to medium streamflow. A sample problem to demonstrate the estimating method is solved for a hypothetical situation in which 100,000 pounds of contaminant is spilled at a railroad crossing between Spring Valley and Hennepin, Illinois. (USGS)

  12. Numerical simulation of H2/air detonation using unstructured mesh

    NASA Astrophysics Data System (ADS)

    Togashi, Fumiya; Löhner, Rainald; Tsuboi, Nobuyuki

    2009-06-01

    To explore the capability of unstructured mesh to simulate detonation wave propagation phenomena, numerical simulation of H2/air detonation using unstructured mesh was conducted. The unstructured mesh has several adv- antages such as easy mesh adaptation and flexibility to the complicated configurations. To examine the resolution dependency of the unstructured mesh, several simulations varying the mesh size were conducted and compared with a computed result using a structured mesh. The results show that the unstructured mesh solution captures the detailed structure of detonation wave, as well as the structured mesh solution. To capture the detailed detonation cell structure, the unstructured mesh simulations required at least twice, ideally 5times the resolution of structured mesh solution.

  13. CFB boiler for Southern Illinois University: Planning and design

    SciTech Connect

    Silvey, M.; Roth, N.; Haake, A.

    1995-12-31

    Southern Illinois University (SIU) is in the process of installing a Babcock and Wilcox (B and W) coal fired circulating fluidized bed (CFB) boiler at its Carbondale, Illinois campus. The CFB boiler will be used for cogeneration. Funding for this project was made possible by the State of Illinois Capital Development Board. Illinois coal will be fired in this CFB boiler. This paper provides a description of the planning process and design of the CFB boiler and related equipment with specific emphasis on particulate removal and recirculation. The startup of this new installation is scheduled for the summer of 1996, with commercial operation by fall of 1996.

  14. Sources of climatologic, hydrologic, and hydraulic information in the Illinois River basin, Illinois, Indiana, and Wisconsin

    USGS Publications Warehouse

    Curtis, G.W.

    1986-01-01

    Information on the sources of climatologic, hydrologic, and hydraulic data for the Illinois River basin is compiled in 20 tables. The study was conducted in cooperation with the U.S. Army Corps of Engineers, Rock Island District, to provide information for their master regulation manual of the llliniois Waterway. Eighteen governmental agencies were queried and a literature search was conducted to identify the source and availability of information on precipitation, major storms, streamflow, water quality and sediment, major floods, water-surface profiles, bridges and other structures, stream geometry, aerial photography, flood damages, Illinois River access facilities, Federal lands, and data ratings. A selected bibliography of published reports was developed.

  15. Grid adaptation using chimera composite overlapping meshes

    NASA Technical Reports Server (NTRS)

    Kao, Kai-Hsiung; Liou, Meng-Sing; Chow, Chuen-Yen

    1994-01-01

    The objective of this paper is to perform grid adaptation using composite overlapping meshes in regions of large gradient to accurately capture the salient features during computation. The chimera grid scheme, a multiple overset mesh technique, is used in combination with a Navier-Stokes solver. The numerical solution is first converged to a steady state based on an initial coarse mesh. Solution-adaptive enhancement is then performed by using a secondary fine grid system which oversets on top of the base grid in the high-gradient region, but without requiring the mesh boundaries to join in any special way. Communications through boundary interfaces between those separated grids are carried out using trilinear interpolation. Application to the Euler equations for shock reflections and to shock wave/boundary layer interaction problem are tested. With the present method, the salient features are well-resolved.

  16. Grid adaptation using Chimera composite overlapping meshes

    NASA Technical Reports Server (NTRS)

    Kao, Kai-Hsiung; Liou, Meng-Sing; Chow, Chuen-Yen

    1993-01-01

    The objective of this paper is to perform grid adaptation using composite over-lapping meshes in regions of large gradient to capture the salient features accurately during computation. The Chimera grid scheme, a multiple overset mesh technique, is used in combination with a Navier-Stokes solver. The numerical solution is first converged to a steady state based on an initial coarse mesh. Solution-adaptive enhancement is then performed by using a secondary fine grid system which oversets on top of the base grid in the high-gradient region, but without requiring the mesh boundaries to join in any special way. Communications through boundary interfaces between those separated grids are carried out using tri-linear interpolation. Applications to the Euler equations for shock reflections and to a shock wave/boundary layer interaction problem are tested. With the present method, the salient features are well resolved.

  17. A mesh gradient technique for numerical optimization

    NASA Technical Reports Server (NTRS)

    Willis, E. A., Jr.

    1973-01-01

    A class of successive-improvement optimization methods in which directions of descent are defined in the state space along each trial trajectory are considered. The given problem is first decomposed into two discrete levels by imposing mesh points. Level 1 consists of running optimal subarcs between each successive pair of mesh points. For normal systems, these optimal two-point boundary value problems can be solved by following a routine prescription if the mesh spacing is sufficiently close. A spacing criterion is given. Under appropriate conditions, the criterion value depends only on the coordinates of the mesh points, and its gradient with respect to those coordinates may be defined by interpreting the adjoint variables as partial derivatives of the criterion value function. In level 2, the gradient data is used to generate improvement steps or search directions in the state space which satisfy the boundary values and constraints of the given problem.

  18. A parallel algorithm for mesh smoothing

    SciTech Connect

    Freitag, L.; Jones, M.; Plassmann, P.

    1999-07-01

    Maintaining good mesh quality during the generation and refinement of unstructured meshes in finite-element applications is an important aspect in obtaining accurate discretizations and well-conditioned linear systems. In this article, the authors present a mesh-smoothing algorithm based on nonsmooth optimization techniques and a scalable implementation of this algorithm. They prove that the parallel algorithm has a provably fast runtime bound and executes correctly for a parallel random access machine (PRAM) computational model. They extend the PRAM algorithm to distributed memory computers and report results for two-and three-dimensional simplicial meshes that demonstrate the efficiency and scalability of this approach for a number of different test cases. They also examine the effect of different architectures on the parallel algorithm and present results for the IBM SP supercomputer and an ATM-connected network of SPARC Ultras.

  19. LR: Compact connectivity representation for triangle meshes

    SciTech Connect

    Gurung, T; Luffel, M; Lindstrom, P; Rossignac, J

    2011-01-28

    We propose LR (Laced Ring) - a simple data structure for representing the connectivity of manifold triangle meshes. LR provides the option to store on average either 1.08 references per triangle or 26.2 bits per triangle. Its construction, from an input mesh that supports constant-time adjacency queries, has linear space and time complexity, and involves ordering most vertices along a nearly-Hamiltonian cycle. LR is best suited for applications that process meshes with fixed connectivity, as any changes to the connectivity require the data structure to be rebuilt. We provide an implementation of the set of standard random-access, constant-time operators for traversing a mesh, and show that LR often saves both space and traversal time over competing representations.

  20. Grid adaption using Chimera composite overlapping meshes

    NASA Technical Reports Server (NTRS)

    Kao, Kai-Hsiung; Liou, Meng-Sing; Chow, Chuen-Yen

    1993-01-01

    The objective of this paper is to perform grid adaptation using composite over-lapping meshes in regions of large gradient to capture the salient features accurately during computation. The Chimera grid scheme, a multiple overset mesh technique, is used in combination with a Navier-Stokes solver. The numerical solution is first converged to a steady state based on an initial coarse mesh. Solution-adaptive enhancement is then performed by using a secondary fine grid system which oversets on top of the base grid in the high-gradient region, but without requiring the mesh boundaries to join in any special way. Communications through boundary interfaces between those separated grids are carried out using tri-linear interpolation. Applications to the Euler equations for shock reflections and to a shock wave/boundary layer interaction problem are tested. With the present method, the salient features are well resolved.

  1. Efficiently Sorting Zoo-Mesh Data Sets

    SciTech Connect

    Cook, R; Max, N; Silva, C; Williams, P

    2001-03-26

    The authors describe the SXMPVO algorithm for performing a visibility ordering zoo-meshed polyhedra. The algorithm runs in practice in linear time and the visibility ordering which it produces is exact.

  2. Octree based automatic meshing from CSG models

    NASA Technical Reports Server (NTRS)

    Perucchio, Renato

    1987-01-01

    Finite element meshes derived automatically from solid models through recursive spatial subdivision schemes (octrees) can be made to inherit the hierarchical structure and the spatial addressability intrinsic to the underlying grid. These two properties, together with the geometric regularity that can also be built into the mesh, make octree based meshes ideally suited for efficient analysis and self-adaptive remeshing and reanalysis. The element decomposition of the octal cells that intersect the boundary of the domain is emphasized. The problem, central to octree based meshing, is solved by combining template mapping and element extraction into a procedure that utilizes both constructive solid geometry and boundary respresentation techniques. Boundary cells that are not intersected by the edge of the domain boundary are easily mapped to predefined element topology. Cells containing edges (and vertices) are first transformed into a planar polyhedron and then triangulated via element extractors. The modeling environments required for the derivation of planar polyhedra and for element extraction are analyzed.

  3. An efficient parallel algorithm for mesh smoothing

    SciTech Connect

    Freitag, L.; Plassmann, P.; Jones, M.

    1995-12-31

    Automatic mesh generation and adaptive refinement methods have proven to be very successful tools for the efficient solution of complex finite element applications. A problem with these methods is that they can produce poorly shaped elements; such elements are undesirable because they introduce numerical difficulties in the solution process. However, the shape of the elements can be improved through the determination of new geometric locations for mesh vertices by using a mesh smoothing algorithm. In this paper the authors present a new parallel algorithm for mesh smoothing that has a fast parallel runtime both in theory and in practice. The authors present an efficient implementation of the algorithm that uses non-smooth optimization techniques to find the new location of each vertex. Finally, they present experimental results obtained on the IBM SP system demonstrating the efficiency of this approach.

  4. Removal of line artifacts on mesh boundary in computer generated hologram by mesh phase matching.

    PubMed

    Park, Jae-Hyeung; Yeom, Han-Ju; Kim, Hee-Jae; Zhang, HuiJun; Li, BoNi; Ji, Yeong-Min; Kim, Sang-Hoo

    2015-03-23

    Mesh-based computer generated hologram enables realistic and efficient representation of three-dimensional scene. However, the dark line artifacts on the boundary between neighboring meshes are frequently observed, degrading the quality of the reconstruction. In this paper, we propose a simple technique to remove the dark line artifacts by matching the phase on the boundary of neighboring meshes. The feasibility of the proposed method is confirmed by the numerical and optical reconstruction of the generated hologram. PMID:25837138

  5. Refining quadrilateral and brick element meshes

    SciTech Connect

    Schneiders, R.; Debye, J.

    1995-12-31

    We consider the problem of refining unstructured quadrilateral and brick element meshes. We present an algorithm which is a generalization of an algorithm developed by Cheng et. al. for structured quadrilateral element meshes. The problem is solved for the two-dimensional case. Concerning three dimensions we present a solution for some special cases and a general solution that introduces tetrahedral and pyramidal transition elements.

  6. MHD simulations on an unstructured mesh

    SciTech Connect

    Strauss, H.R.; Park, W.; Belova, E.; Fu, G.Y.; Longcope, D.W.; Sugiyama, L.E.

    1998-12-31

    Two reasons for using an unstructured computational mesh are adaptivity, and alignment with arbitrarily shaped boundaries. Two codes which use finite element discretization on an unstructured mesh are described. FEM3D solves 2D and 3D RMHD using an adaptive grid. MH3D++, which incorporates methods of FEM3D into the MH3D generalized MHD code, can be used with shaped boundaries, which might be 3D.

  7. Implantation of the eSVS Mesh.

    PubMed

    Emery, Robert W; Solien, Eric; Jamieson, Stuart W

    2012-01-01

    The eSVS Mesh (Kipps Bay Medical, Minneapolis, MN USA) Mesh (Kipps Bay Medical, Minneapolis, MN USA) is a new concept in improving saphenous vein graft patency for coronary bypass grafting. This is a nitinol-based external support device that maintains external support of the graft and prevents detrimental expansion when exposed to arterial pressure. The implanting technique is critical to outcomes and is described in this article. Clinical testing in the United States is pending. PMID:22576039

  8. Adaptive Mesh Refinement for Microelectronic Device Design

    NASA Technical Reports Server (NTRS)

    Cwik, Tom; Lou, John; Norton, Charles

    1999-01-01

    Finite element and finite volume methods are used in a variety of design simulations when it is necessary to compute fields throughout regions that contain varying materials or geometry. Convergence of the simulation can be assessed by uniformly increasing the mesh density until an observable quantity stabilizes. Depending on the electrical size of the problem, uniform refinement of the mesh may be computationally infeasible due to memory limitations. Similarly, depending on the geometric complexity of the object being modeled, uniform refinement can be inefficient since regions that do not need refinement add to the computational expense. In either case, convergence to the correct (measured) solution is not guaranteed. Adaptive mesh refinement methods attempt to selectively refine the region of the mesh that is estimated to contain proportionally higher solution errors. The refinement may be obtained by decreasing the element size (h-refinement), by increasing the order of the element (p-refinement) or by a combination of the two (h-p refinement). A successful adaptive strategy refines the mesh to produce an accurate solution measured against the correct fields without undue computational expense. This is accomplished by the use of a) reliable a posteriori error estimates, b) hierarchal elements, and c) automatic adaptive mesh generation. Adaptive methods are also useful when problems with multi-scale field variations are encountered. These occur in active electronic devices that have thin doped layers and also when mixed physics is used in the calculation. The mesh needs to be fine at and near the thin layer to capture rapid field or charge variations, but can coarsen away from these layers where field variations smoothen and charge densities are uniform. This poster will present an adaptive mesh refinement package that runs on parallel computers and is applied to specific microelectronic device simulations. Passive sensors that operate in the infrared portion of

  9. Quadrilateral/hexahedral finite element mesh coarsening

    SciTech Connect

    Staten, Matthew L; Dewey, Mark W; Scott, Michael A; Benzley, Steven E

    2012-10-16

    A technique for coarsening a finite element mesh ("FEM") is described. This technique includes identifying a coarsening region within the FEM to be coarsened. Perimeter chords running along perimeter boundaries of the coarsening region are identified. The perimeter chords are redirected to create an adaptive chord separating the coarsening region from a remainder of the FEM. The adaptive chord runs through mesh elements residing along the perimeter boundaries of the coarsening region. The adaptive chord is then extracted to coarsen the FEM.

  10. Arbitrary Lagrangian Eulerian Adaptive Mesh Refinement

    SciTech Connect

    Koniges, A.; Eder, D.; Masters, N.; Fisher, A.; Anderson, R.; Gunney, B.; Wang, P.; Benson, D.; Dixit, P.

    2009-09-29

    This is a simulation code involving an ALE (arbitrary Lagrangian-Eulerian) hydrocode with AMR (adaptive mesh refinement) and pluggable physics packages for material strength, heat conduction, radiation diffusion, and laser ray tracing developed a LLNL, UCSD, and Berkeley Lab. The code is an extension of the open source SAMRAI (Structured Adaptive Mesh Refinement Application Interface) code/library. The code can be used in laser facilities such as the National Ignition Facility. The code is alsi being applied to slurry flow (landslides).

  11. Airplane Mesh Development with Grid Density Studies

    NASA Technical Reports Server (NTRS)

    Cliff, Susan E.; Baker, Timothy J.; Thomas, Scott D.; Lawrence, Scott L.; Rimlinger, Mark J.

    1999-01-01

    Automatic Grid Generation Wish List Geometry handling, including CAD clean up and mesh generation, remains a major bottleneck in the application of CFD methods. There is a pressing need for greater automation in several aspects of the geometry preparation in order to reduce set up time and eliminate user intervention as much as possible. Starting from the CAD representation of a configuration, there may be holes or overlapping surfaces which require an intensive effort to establish cleanly abutting surface patches, and collections of many patches may need to be combined for more efficient use of the geometrical representation. Obtaining an accurate and suitable body conforming grid with an adequate distribution of points throughout the flow-field, for the flow conditions of interest, is often the most time consuming task for complex CFD applications. There is a need for a clean unambiguous definition of the CAD geometry. Ideally this would be carried out automatically by smart CAD clean up software. One could also define a standard piece-wise smooth surface representation suitable for use by computational methods and then create software to translate between the various CAD descriptions and the standard representation. Surface meshing remains a time consuming, user intensive procedure. There is a need for automated surface meshing, requiring only minimal user intervention to define the overall density of mesh points. The surface mesher should produce well shaped elements (triangles or quadrilaterals) whose size is determined initially according to the surface curvature with a minimum size for flat pieces, and later refined by the user in other regions if necessary. Present techniques for volume meshing all require some degree of user intervention. There is a need for fully automated and reliable volume mesh generation. In addition, it should be possible to create both surface and volume meshes that meet guaranteed measures of mesh quality (e.g. minimum and maximum

  12. TVD differencing on three-dimensional unstructured meshes with monotonicity-preserving correction of mesh skewness

    NASA Astrophysics Data System (ADS)

    Denner, Fabian; van Wachem, Berend G. M.

    2015-10-01

    Total variation diminishing (TVD) schemes are a widely applied group of monotonicity-preserving advection differencing schemes for partial differential equations in numerical heat transfer and computational fluid dynamics. These schemes are typically designed for one-dimensional problems or multidimensional problems on structured equidistant quadrilateral meshes. Practical applications, however, often involve complex geometries that cannot be represented by Cartesian meshes and, therefore, necessitate the application of unstructured meshes, which require a more sophisticated discretisation to account for their additional topological complexity. In principle, TVD schemes are applicable to unstructured meshes, however, not all the data required for TVD differencing is readily available on unstructured meshes, and the solution suffers from considerable numerical diffusion as a result of mesh skewness. In this article we analyse TVD differencing on unstructured three-dimensional meshes, focusing on the non-linearity of TVD differencing and the extrapolation of the virtual upwind node. Furthermore, we propose a novel monotonicity-preserving correction method for TVD schemes that significantly reduces numerical diffusion caused by mesh skewness. The presented numerical experiments demonstrate the importance of accounting for the non-linearity introduced by TVD differencing and of imposing carefully chosen limits on the extrapolated virtual upwind node, as well as the efficacy of the proposed method to correct mesh skewness.

  13. Mesh geometry impact on Micromegas performance with an Exchangeable Mesh prototype

    NASA Astrophysics Data System (ADS)

    Kuger, F.; Bianco, M.; Iengo, P.; Sekhniaidze, G.; Veenhof, R.; Wotschack, J.

    2016-07-01

    The reconstruction precision of gaseous detectors is limited by losses of primary electrons during signal formation. In addition to common gas related losses, like attachment, Micromegas suffer from electron absorption during its transition through the micro mesh. This study aims for a deepened understanding of electron losses and their dependency on the mesh geometry. It combines experimental results obtained with a novel designed Exchangeable Mesh Micromegas (ExMe) and advanced microscopic-tracking simulations (ANSYS and Garfield++) of electron drift and mesh transition.

  14. Adaptive Meshing Techniques for Viscous Flow Calculations on Mixed Element Unstructured Meshes

    NASA Technical Reports Server (NTRS)

    Mavriplis, D. J.

    1997-01-01

    An adaptive refinement strategy based on hierarchical element subdivision is formulated and implemented for meshes containing arbitrary mixtures of tetrahendra, hexahendra, prisms and pyramids. Special attention is given to keeping memory overheads as low as possible. This procedure is coupled with an algebraic multigrid flow solver which operates on mixed-element meshes. Inviscid flows as well as viscous flows are computed an adaptively refined tetrahedral, hexahedral, and hybrid meshes. The efficiency of the method is demonstrated by generating an adapted hexahedral mesh containing 3 million vertices on a relatively inexpensive workstation.

  15. Hybrid Surface Mesh Adaptation for Climate Modeling

    SciTech Connect

    Khamayseh, Ahmed K; de Almeida, Valmor F; Hansen, Glen

    2008-01-01

    Solution-driven mesh adaptation is becoming quite popular for spatial error control in the numerical simulation of complex computational physics applications, such as climate modeling. Typically, spatial adaptation is achieved by element subdivision (h adaptation) with a primary goal of resolving the local length scales of interest. A second, less-popular method of spatial adaptivity is called "mesh motion" (r adaptation); the smooth repositioning of mesh node points aimed at resizing existing elements to capture the local length scales. This paper proposes an adaptation method based on a combination of both element subdivision and node point repositioning (rh adaptation). By combining these two methods using the notion of a mobility function, the proposed approach seeks to increase the flexibility and extensibility of mesh motion algorithms while providing a somewhat smoother transition between refined regions than is produced by element subdivision alone. Further, in an attempt to support the requirements of a very general class of climate simulation applications, the proposed method is designed to accommodate unstructured, polygonal mesh topologies in addition to the most popular mesh types.

  16. Hybrid Surface Mesh Adaptation for Climate Modeling

    SciTech Connect

    Ahmed Khamayseh; Valmor de Almeida; Glen Hansen

    2008-10-01

    Solution-driven mesh adaptation is becoming quite popular for spatial error control in the numerical simulation of complex computational physics applications, such as climate modeling. Typically, spatial adaptation is achieved by element subdivision (h adaptation) with a primary goal of resolving the local length scales of interest. A second, less-popular method of spatial adaptivity is called “mesh motion” (r adaptation); the smooth repositioning of mesh node points aimed at resizing existing elements to capture the local length scales. This paper proposes an adaptation method based on a combination of both element subdivision and node point repositioning (rh adaptation). By combining these two methods using the notion of a mobility function, the proposed approach seeks to increase the flexibility and extensibility of mesh motion algorithms while providing a somewhat smoother transition between refined regions than is produced by element subdivision alone. Further, in an attempt to support the requirements of a very general class of climate simulation applications, the proposed method is designed to accommodate unstructured, polygonal mesh topologies in addition to the most popular mesh types.

  17. How to model wireless mesh networks topology

    NASA Astrophysics Data System (ADS)

    Sanni, M. L.; Hashim, A. A.; Anwar, F.; Ahmed, G. S. M.; Ali, S.

    2013-12-01

    The specification of network connectivity model or topology is the beginning of design and analysis in Computer Network researches. Wireless Mesh Networks is an autonomic network that is dynamically self-organised, self-configured while the mesh nodes establish automatic connectivity with the adjacent nodes in the relay network of wireless backbone routers. Researches in Wireless Mesh Networks range from node deployment to internetworking issues with sensor, Internet and cellular networks. These researches require modelling of relationships and interactions among nodes including technical characteristics of the links while satisfying the architectural requirements of the physical network. However, the existing topology generators model geographic topologies which constitute different architectures, thus may not be suitable in Wireless Mesh Networks scenarios. The existing methods of topology generation are explored, analysed and parameters for their characterisation are identified. Furthermore, an algorithm for the design of Wireless Mesh Networks topology based on square grid model is proposed in this paper. The performance of the topology generated is also evaluated. This research is particularly important in the generation of a close-to-real topology for ensuring relevance of design to the intended network and validity of results obtained in Wireless Mesh Networks researches.

  18. Automatic scheme selection for toolkit hex meshing

    SciTech Connect

    WHITE,DAVID R.; TAUTGES,TIMOTHY J.

    2000-02-17

    Current hexahedral mesh generation techniques rely on a set of meshing tools, which when combined with geometry decomposition leads to an adequate mesh generation process. Of these tools, sweeping tends to be the workhorse algorithm, accounting for at least 50% of most meshing applications. Constraints which must be met for a volume to be sweepable are derived, and it is proven that these constraints are necessary but not sufficient conditions for sweepability. This paper also describes a new algorithm for detecting extruded or sweepable geometries. This algorithm, based on these constraints, uses topological and local geometric information, and is more robust than feature recognition-based algorithms. A method for computing sweep dependencies in volume assemblies is also given. The auto sweep detect and sweep grouping algorithms have been used to reduce interactive user time required to generate all-hexahedral meshes by filtering out non-sweepable volumes needing further decomposition and by allowing concurrent meshing of independent sweep groups. Parts of the auto sweep detect algorithm have also been used to identify independent sweep paths, for use in volume-based interval assignment.

  19. Automatic Scheme Selection for Toolkit Hex Meshing

    SciTech Connect

    TAUTGES,TIMOTHY J.; WHITE,DAVID R.

    1999-09-27

    Current hexahedral mesh generation techniques rely on a set of meshing tools, which when combined with geometry decomposition leads to an adequate mesh generation process. Of these tools, sweeping tends to be the workhorse algorithm, accounting for at least 50% of most meshing applications. Constraints which must be met for a volume to be sweepable are derived, and it is proven that these constraints are necessary but not sufficient conditions for sweepability. This paper also describes a new algorithm for detecting extruded or sweepable geometries. This algorithm, based on these constraints, uses topological and local geometric information, and is more robust than feature recognition-based algorithms. A method for computing sweep dependencies in volume assemblies is also given. The auto sweep detect and sweep grouping algorithms have been used to reduce interactive user time required to generate all-hexahedral meshes by filtering out non-sweepable volumes needing further decomposition and by allowing concurrent meshing of independent sweep groups. Parts of the auto sweep detect algorithm have also been used to identify independent sweep paths, for use in volume-based interval assignment.

  20. Discrete differential geometry: The nonplanar quadrilateral mesh

    NASA Astrophysics Data System (ADS)

    Twining, Carole J.; Marsland, Stephen

    2012-06-01

    We consider the problem of constructing a discrete differential geometry defined on nonplanar quadrilateral meshes. Physical models on discrete nonflat spaces are of inherent interest, as well as being used in applications such as computation for electromagnetism, fluid mechanics, and image analysis. However, the majority of analysis has focused on triangulated meshes. We consider two approaches: discretizing the tensor calculus, and a discrete mesh version of differential forms. While these two approaches are equivalent in the continuum, we show that this is not true in the discrete case. Nevertheless, we show that it is possible to construct mesh versions of the Levi-Civita connection (and hence the tensorial covariant derivative and the associated covariant exterior derivative), the torsion, and the curvature. We show how discrete analogs of the usual vector integral theorems are constructed in such a way that the appropriate conservation laws hold exactly on the mesh, rather than only as approximations to the continuum limit. We demonstrate the success of our method by constructing a mesh version of classical electromagnetism and discuss how our formalism could be used to deal with other physical models, such as fluids.

  1. Discrete differential geometry: the nonplanar quadrilateral mesh.

    PubMed

    Twining, Carole J; Marsland, Stephen

    2012-06-01

    We consider the problem of constructing a discrete differential geometry defined on nonplanar quadrilateral meshes. Physical models on discrete nonflat spaces are of inherent interest, as well as being used in applications such as computation for electromagnetism, fluid mechanics, and image analysis. However, the majority of analysis has focused on triangulated meshes. We consider two approaches: discretizing the tensor calculus, and a discrete mesh version of differential forms. While these two approaches are equivalent in the continuum, we show that this is not true in the discrete case. Nevertheless, we show that it is possible to construct mesh versions of the Levi-Civita connection (and hence the tensorial covariant derivative and the associated covariant exterior derivative), the torsion, and the curvature. We show how discrete analogs of the usual vector integral theorems are constructed in such a way that the appropriate conservation laws hold exactly on the mesh, rather than only as approximations to the continuum limit. We demonstrate the success of our method by constructing a mesh version of classical electromagnetism and discuss how our formalism could be used to deal with other physical models, such as fluids. PMID:23005244

  2. The design and application of upwind schemes on unstructured meshes

    NASA Technical Reports Server (NTRS)

    Barth, Timothy J.; Jespersen, Dennis C.

    1989-01-01

    Solution and mesh generation algorithms for solving the Euler equations on unstructured meshes consisting of triangle and quadrilateral control volumes are presented. Cell-centered and mesh-vertex upwind finite-volume schemes are developed which utilize multi-dimensional monotone linear reconstruction procedures. These algorithms differ from existing algorithms (even on structured meshes). Numerical results in two dimensions are presented.

  3. Numerical evaluation of moiré pattern in touch sensor module with electrode mesh structure in oblique view

    NASA Astrophysics Data System (ADS)

    Pournoury, M.; Zamiri, A.; Kim, T. Y.; Yurlov, V.; Oh, K.

    2016-03-01

    Capacitive touch sensor screen with the metal materials has recently become qualified for substitution of ITO; however several obstacles still have to be solved. One of the most important issues is moiré phenomenon. The visibility problem of the metal-mesh, in touch sensor module (TSM) is numerically considered in this paper. Based on human eye contract sensitivity function (CSF), moiré pattern of TSM electrode mesh structure is simulated with MATLAB software for 8 inch screen display in oblique view. Standard deviation of the generated moiré by the superposition of electrode mesh and screen image is calculated to find the optimal parameters which provide the minimum moiré visibility. To create the screen pixel array and mesh electrode, rectangular function is used. The filtered image, in frequency domain, is obtained by multiplication of Fourier transform of the finite mesh pattern (product of screen pixel and mesh electrode) with the calculated CSF function for three different observer distances (L=200, 300 and 400 mm). It is observed that the discrepancy between analytical and numerical results is less than 0.6% for 400 mm viewer distance. Moreover, in the case of oblique view due to considering the thickness of the finite film between mesh electrodes and screen, different points of minimum standard deviation of moiré pattern are predicted compared to normal view.

  4. 50 CFR 622.208 - Minimum mesh size applicable to rock shrimp off Georgia and Florida.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... mesh size applicable to rock shrimp off Georgia and Florida. (a) The minimum mesh size for the cod end...), stretched mesh. This minimum mesh size is required in at least the last 40 meshes forward of the cod...

  5. Safe Driving in Illinois. A Manual to Accompany the Illinois Rules of the Road.

    ERIC Educational Resources Information Center

    Rice, Gail; Nowack, Linda

    Designed to accompany and supplement the Illinois Rules of the Road manual, this book is intended to better prepare future drivers for the written test for the instruction permit or driver's license. It includes many pictures and shows and describes driving situations a driver will probably face when behind the wheel. Parts dealing with important…

  6. Guide for Migrants in the State of Illinois = Guia para Migrantes en el Estado de Illinois.

    ERIC Educational Resources Information Center

    Langemach, Sharon; Koepplinger, Jessica

    Prepared for migrant farmworkers traveling in the State of Illinois, the booklet, written in English and Spanish, provides basic information on (1) employment conditions--requirements of crew leaders and employers, deductions from wages, and laws regulating child labor; (2) housing--conditions of the camp grounds and of living units; (3)…

  7. Proceedings of Southern Illinois Mathematics Leadership Conference--II (Carbondale, Illinois, February 22, 1986).

    ERIC Educational Resources Information Center

    Pedersen, Katherine, Ed.; Owens, Alison, Ed.

    The purpose of this conference was to discuss the implications on the teaching and learning of mathematics of the system of objectives and assessment instruments that must be generated in order to meet state directives in Illinois. General overall concerns included: (1) the classroom teacher and district administrators may view the testing as…

  8. Illinois Charter Schools: Seeds for Change. Annual Report on Illinois Charter Schools, 2000.

    ERIC Educational Resources Information Center

    Illinois State Board of Education, Springfield.

    This document consists of a series of questions generally asked about charter schools. Charter-school personnel provided a major portion of the information. The questions are as follows: "What are charter schools?""What do Illinois charter schools look like?""What flexibility do charter schools have?""How are charter school students…

  9. Method of modifying a volume mesh using sheet insertion

    DOEpatents

    Borden, Michael J.; Shepherd, Jason F.

    2006-08-29

    A method and machine-readable medium provide a technique to modify a hexahedral finite element volume mesh using dual generation and sheet insertion. After generating a dual of a volume stack (mesh), a predetermined algorithm may be followed to modify (refine) the volume mesh of hexahedral elements. The predetermined algorithm may include the steps of locating a sheet of hexahedral mesh elements, determining a plurality of hexahedral elements within the sheet to refine, shrinking the plurality of elements, and inserting a new sheet of hexahedral elements adjacently to modify the volume mesh. Additionally, another predetermined algorithm using mesh cutting may be followed to modify a volume mesh.

  10. Deutsch 100, 200, 300.

    ERIC Educational Resources Information Center

    Manitoba Dept. of Education, Winnipeg.

    Manitoba's curriculum guide for German 100, 200, and 300 is designed to (1) make teachers of these courses aware of the official policy concerning the nature, goals, and objectives of the courses and approved teaching materials, and (2) provide instructional guidelines. The guide provides information about three sets of teaching materials from…

  11. Status of EXO-200

    SciTech Connect

    Ackerman, Nicole; /SLAC

    2011-12-06

    EXO-200 is the first phase of the Enriched Xenon Observatory (EXO) experiment, which searches for neutrinoless double beta decay in {sup 136}Xe to measure the mass and probe the Majorana nature of the neutrino. EXO-200 consists of 200 kg of liquid Xe enriched to 80% in {sup 136}Xe in an ultra-low background TPC. Energy resolution is enhanced through the simultaneous collection of scintillation light using Large Area Avalanche Photodiodes (LAAPD's) and ionization charge. It is being installed at the WIPP site in New Mexico, which provides a 2000 meter water-equivalent overburden. EXO-200 will begin taking data in 2009, with the expected two-year sensitivity to the half-life for neutrinoless double beta decay of 6.4 x 10{sup 25} years. According to the most recent nuclear matrix element calculations, this corresponds to an effective Majorana neutrino mass of 0.13 to 0.19 eV. It will also measure the two neutrino mode for the first time in {sup 136}Xe.

  12. Chemical analyses of surface water in Illinois, 1975-77; Volume 2, Illinois River basin and Mississippi River tributaries north of Illinois River basin

    USGS Publications Warehouse

    Grason, David; Healy, R.W.

    1979-01-01

    Samples of surface water were collected and analyzed by the Illinois Environmental Protection Agency. The results from water years 1975 to 1977 are presented in three volumes. The history of sampling and analytical methods used during that period are summarized. Stream discharge data from records of the U.S. Geological Survey are included for all sites where samples were collected at gaging stations or near enough that reliable discharge estimates could be made. Volume II includes the Illinois River basin and Mississippi River tributaries north of Illinois River basin. (Woodard-USGS)

  13. Zoonotic Anatrichosomiasis in an Illinois Resident

    PubMed Central

    Eberhard, Mark L.; Mathison, Blaine; Bishop, Henry; Handoo, Nidhi Q.; Hellstein, John W.

    2010-01-01

    We describe a case of zoonotic anatrichosomiasis in a patient from Illinois. A 44-year-old immigrant from Mexico originally presented with a history of multiple oral ulcers and two submucosal nodules on the dorsal surface of the tongue. An incisional biopsy was taken to assist with diagnosis. Examination of stained sections revealed the presence of a coiled nematode. The histologic examination displayed trichuroid features. Anatomic structures that aided in the identification included esophagus embedded in a prominent stichosome in the anterior end, paired bacillary bands, and small size. The location of the worm within the oral mucosal epithelium also facilitated the diagnosis. PMID:20682879

  14. Parasites of cottontail rabbits of southern Illinois.

    PubMed

    Lepitzki, D A; Woolf, A; Bunn, B M

    1992-12-01

    Fifteen species of parasites including Haemaphysalis leporispalustris, Ixodes dentatus, Amblyomma americanum, Cediopsylla simplex, Odontopsyllus multispinosus, Cuterebra sp., Obeliscoides cuniculi, Trichostrongylus calcaratus, Trichostrongylus affinis, Longistriata noviberiae, Dermatoxys veligera, Trichuris sp., Mosgovoyia sp., Taenia pisiformis, and Hasstilesia tricolor as well as coccidia oocysts were collected from 96 cottontail rabbits (Sylvilagus floridanus) confined to a pen in southern Illinois in 1983 and 1984. The diversity of parasites and the intensities of infections were similar to published reports on free-ranging populations. Most variations in parasite abundances were attributable to season. Few lesions were seen in association with parasitism. PMID:1491303

  15. Organic desulfurization of Illinois No. 6 coal

    SciTech Connect

    Stock, L.M.; Chatterjee, K.

    1993-09-01

    First, lithium aluminum hydride cleanly removes pyrite from the Illinois No. 6 coal to leave the original organosulfur compounds. Second, the SET reagent selectively removes sulfur from heterocyclic sulfur compounds and aromatic sulfides. Lochmann`s base does not remove the sulfur from the heterocycles, but does react with sulfidic sulfur compounds such as alkyl aromatic sulfides that are susceptible to base catalyzed elimination reactions. Third, the organic sulfur compounds that remain after the dual SET and BASE treatment are dominantly aliphatic substances including alkyl and allylic thiols and fourth the sulfur compounds that remain are susceptible to thermal decomposition and acid hydrolysis.

  16. Student Suicide and Illinois' Small Schools: Breaking the Silence.

    ERIC Educational Resources Information Center

    Rittenmeyer, Steven D.

    1999-01-01

    Suicide is the fourth leading cause of death among American youth aged 5-24, and small and rural school districts must recognize and address this growing phenomenon. A survey of 462 Illinois principals reported 133 student suicides during the 5-year study period. Small school districts comprised 6 percent of Illinois school districts yet reported…

  17. The Supply and Demand for Illinois Mathematics and Science Teachers.

    ERIC Educational Resources Information Center

    Illinois State Board of Education, Springfield, Dept. of Planning, Research and Evaluation.

    This report focuses on the supply/demand of mathematics/science (M/S) teachers in Illinois, evaluating four major assumptions made about these teachers. Each assumption is identified and examined in terms of whether the Illinois data support/reject the assumption. These assumptions are: (1) Supply of M/S teachers is insufficient to meet demand;…

  18. Financial Reporting Practices in Illinois Public Community Colleges.

    ERIC Educational Resources Information Center

    Skeadas, Gus J.

    A study was conducted to determine how well Illinois' 38 community college districts satisfied the needs of board members, creditors, investors, and tax payers for financial information. A list of 38 financial reporting requirements was developed from the requirements of the Illinois Community College Board (ICCB) and guidelines from the Audits of…

  19. Illinois Occupational Skill Standards: Industrial Maintenance General Maintenance Cluster.

    ERIC Educational Resources Information Center

    Illinois Occupational Skill Standards and Credentialing Council, Carbondale.

    These skill standards for the industrial maintenance general maintenance cluster are intended to be a guide to workforce preparation program providers in defining content for their programs and to employers to establish the skills and standards necessary for job acquisition. An introduction provides the Illinois perspective; Illinois Occupational…

  20. Ed School Essentials: A Review of Illinois Teacher Preparation

    ERIC Educational Resources Information Center

    Greenberg, Julie; Walsh, Kate

    2010-01-01

    The imperative for prospective teachers, school districts, Illinois policy makers and the public as a whole to know more about teacher preparation is the motivation behind this report. At the request of Advance Illinois, the authors evaluated 111 undergraduate and graduate programs in 53 education schools as well as three "independent providers"…

  1. Data and Characteristics of the Illinois Public Community College System

    ERIC Educational Resources Information Center

    Illinois Community College Board, 2005

    2005-01-01

    This document contains data and characteristics of the Illinois public community college system and is designed to serve as a basic reference. No analysis of the data is intended in this document. The data are obtained from various surveys and studies conducted by Illinois Community College Board (ICCB). staff and from the colleges' annual MIS…

  2. The Relationship between Educational Resources and Student Achievement in Illinois

    ERIC Educational Resources Information Center

    McKelvey, Barbara E.

    2013-01-01

    This dissertation examined the relationship between educational resources and student achievement in Illinois public schools. Illinois school districts were compared by type, size, and location. This study built on the premise that disparities exist in educational resources because of the state's reliance on property taxes to fund education.…

  3. Illinois Community College Funding Formula Survey. Volume 21, Number 2.

    ERIC Educational Resources Information Center

    Fonte, Richard; And Others

    A survey was conducted of Illinois community college presidents and business managers to determine current institutional thinking on the Illinois funding formula. Study findings, based on responses from 36 out of the 39 colleges in the state included the following: (1) 64% of the respondents favored the concept of averaging credit hours and unit…

  4. Selected Collective Bargaining Agreements of Illinois Two-Year Colleges.

    ERIC Educational Resources Information Center

    National Education Association, Washington, DC.

    Collective bargaining agreements of 22 selected Illinois two-year colleges are presented, representing contracts in effect in 1988. Contracts for the following colleges are included: Belleville Area College, Black Hawk College, Carl Sandburg College, College of Lake County, Cook County College, Highland Community College, Illinois Central College,…

  5. The Funding Plan for the Illinois Public Community College System.

    ERIC Educational Resources Information Center

    Loftus, Virginia L.

    A revised funding plan for the Illinois Community College System is presented as adopted by the Illinois Board of Higher Education for implementation in the fiscal year (FY) 1981 budget process. After outlining the characteristics of the community college system, the report provides a summary of the funding plan, pointing out the advantages and…

  6. 75 FR 40816 - Northern Illinois Hydropower, LLC; Notice of Meeting

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-07-14

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF ENERGY Federal Energy Regulatory Commission Northern Illinois Hydropower, LLC; Notice of Meeting July 7, 2010. a. Date and Time of Meeting: Thursday, July 22, 2010 from 9 a.m. to 12 p.m. CDT. b. Place: Illinois...

  7. Illinois Occupational Skill Standards: Entry-Level Truck Driver.

    ERIC Educational Resources Information Center

    Illinois Occupational Skill Standards and Credentialing Council, Carbondale.

    This document, which is intended to serve as a guide for workforce preparation program providers, details the Illinois Occupational Skill Standards for programs preparing students for employment as entry-level truck drivers. The document begins with a brief overview of the Illinois perspective on occupational skill standards and credentialing, the…

  8. Water quality in Illinois, 1990-1991. Biennial report

    SciTech Connect

    Northrop, C.

    1993-01-01

    The report is a summary of the 305(b) Illinois Water Quality Report. It highlights the 1990 - 1991 water quality conditions of Illinois rivers, streams, inland lakes, Lake Michigan, and groundwater. The report also outlines current water quality issues and the IEPA's water pollution control programs.

  9. 77 FR 47060 - Illinois Municipal Electric Agency; Notice of Filing

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-08-07

    ... Energy Regulatory Commission Illinois Municipal Electric Agency; Notice of Filing Take notice that on July 30, 2012, Illinois Municipal Electric Agency filed a Proposed Revenue Requirement for reactive... free). For TTY, call (202) 502-8659. Comment Date: 5:00 p.m. Eastern Time on August 20, 2012....

  10. 77 FR 61596 - Illinois Electric Agency; Notice of Filing

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-10-10

    ... Energy Regulatory Commission Illinois Electric Agency; Notice of Filing Take notice that on October 1, 2012, Illinois Electric Agency filed its Revised and Superseding Proposed Revenue Requirement for... (toll free). For TTY, call (202) 502-8659. Comment Date: 5 p.m. Eastern Time on October 22, 2012....

  11. Illinois Occupational Skill Standards: Finishing and Distribution Cluster.

    ERIC Educational Resources Information Center

    Illinois Occupational Skill Standards and Credentialing Council, Carbondale.

    This document, which is intended as a guide for work force preparation program providers, details the Illinois occupational skill standards for programs preparing students for employment in occupations in the finishing and distribution cluster. The document begins with a brief overview of the Illinois perspective on occupational skill standards…

  12. Antibody Prevalence of West Nile Virus in Birds, Illinois, 2002

    PubMed Central

    Blitvich, Bradley J.; Koo, Hyun-Young; Van de Wyngaerde, Marshall; Brawn, Jeff D.; Novak, Robert J.

    2004-01-01

    Antibodies to West Nile virus were detected in 94 of 1,784 Illinois birds during 2002. Captive and urban birds had higher seropositivity than did birds from natural areas, and northern and central Illinois birds’ seropositivity was greater than that from birds from the southern sites. Adult and hatch-year exposure rates did not differ significantly. PMID:15207067

  13. Illinois Community College Board Management Information Systems Manual. Eighth Edition.

    ERIC Educational Resources Information Center

    Illinois Community Coll. Board, Springfield.

    This manual serves as a guide for Illinois community college personnel in complying with the data requirements of the Illinois Community College Board's Management Information System (MIS). Section I of the manual contains an introduction, general information, a schedule of due dates for various data submissions to the Board, and the policy for…

  14. The Illinois 9th Grade Adolescent Health Survey. Full Report.

    ERIC Educational Resources Information Center

    Illinois State Board of Education, Springfield.

    A survey was conducted in Illinois to identify the risk of certain health problems among adolescents; to determine the health status of Illinois youth in relation to the Surgeon General's "Healthy People 2000 Objectives" and monitor progress toward national and state goals; and to help those working at national, state, and local levels develop…

  15. 2. Historic photograph (from Illinois Central Gulf Railroad) photographer unknown, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    2. Historic photograph (from Illinois Central Gulf Railroad) photographer unknown, 1915 SECOND PASSENGER DEPOT, PHOTOGRAPH TAKEN IN 1915 PRIOR TO REMODELING - Illinois Central Railroad, Passenger Depot No. 2, North of First Street, east of Union Street, La Salle, La Salle County, IL

  16. 9. Historic photograph (from Illinois Central Gulf Railroad), photographer unknown, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    9. Historic photograph (from Illinois Central Gulf Railroad), photographer unknown, ca. 1915 INTERIOR OF SECOND PASSENGER DEPOT, CA. 1915, AFTER REMODELING OF SECOND PASSENGER DEPOT - Illinois Central Railroad, Passenger Depot No. 2, North of First Street, east of Union Street, La Salle, La Salle County, IL

  17. 6. Historic photograph (from Illinois Central Gulf Railroad), photographer unknown, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    6. Historic photograph (from Illinois Central Gulf Railroad), photographer unknown, ca. 1915 SECOND PASSENGER DEPOT, CA. 1915, AFTER REMODELING OF SECOND PASSENGER DEPOT - Illinois Central Railroad, Passenger Depot No. 2, North of First Street, east of Union Street, La Salle, La Salle County, IL

  18. 7. Historic photograph (from Illinois Central Gulf Railroad), photographer unknown, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    7. Historic photograph (from Illinois Central Gulf Railroad), photographer unknown, ca. 1915 SECOND PASSENGER DEPOT, CA. 1915, AFTER REMODELING OF SECOND PASSENGER DEPOT - Illinois Central Railroad, Passenger Depot No. 2, North of First Street, east of Union Street, La Salle, La Salle County, IL

  19. 5. Historic photograph (from Illinois Central Gulf railroad), photographer unknown, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    5. Historic photograph (from Illinois Central Gulf railroad), photographer unknown, ca. 1915 SECOND PASSENGER DEPOT, CA. 1915, DURING REMODELING OF DEPOT - Illinois Central Railroad, Passenger Depot No. 2, North of First Street, east of Union Street, La Salle, La Salle County, IL

  20. 4. Historic photograph (from Illinois Central Railroad), photographer unknown, ca. ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    4. Historic photograph (from Illinois Central Railroad), photographer unknown, ca. 1915 SECOND PASSENGER DEPOT, CA. 1915, DURING REMODELING OF DEPOT - Illinois Central Railroad, Passenger Depot No. 2, North of First Street, east of Union Street, La Salle, La Salle County, IL

  1. 8. Historic photograph (from Illinois Central Gulf Railroad), photographer unknown, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    8. Historic photograph (from Illinois Central Gulf Railroad), photographer unknown, ca. 1915 SECOND PASSENGER DEPOT, CA. 1915, AFTER REMODELING OF SECOND PASSENGER DEPOT - Illinois Central Railroad, Passenger Depot No. 2, North of First Street, east of Union Street, La Salle, La Salle County, IL

  2. 1. Historic photograph (from Illinois Central Railroad), photographer unknown, 1915 ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    1. Historic photograph (from Illinois Central Railroad), photographer unknown, 1915 HISTORIC PHOTOGRAPH OF SECOND PASSENGER DEPOT BEFORE REMODELING, WITH ORIGINAL FREIGHT DEPOT BEYOND - Illinois Central Railroad, Passenger Depot No. 2, North of First Street, east of Union Street, La Salle, La Salle County, IL

  3. 3. Historic photograph (from Illinois Central Gulf Railroad), photographer unknown, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    3. Historic photograph (from Illinois Central Gulf Railroad), photographer unknown, ca. 1915 SECOND PASSENGER DEPOT, CA. 1915 DURING REMODELING OF DEPOT - Illinois Central Railroad, Passenger Depot No. 2, North of First Street, east of Union Street, La Salle, La Salle County, IL

  4. 10. Historic photograph (from Illinois Central Gulf Railroad), photographer unknown, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    10. Historic photograph (from Illinois Central Gulf Railroad), photographer unknown, ca. 1915 INTERIOR OF SECOND PASSENGER DEPOT, CA. 1915, AFTER REMODELING OF SECOND PASSENGER DEPOT - Illinois Central Railroad, Passenger Depot No. 2, North of First Street, east of Union Street, La Salle, La Salle County, IL

  5. Teacher Recertification: A Historical Analysis of the Illinois Process

    ERIC Educational Resources Information Center

    Brodbeck, Nancy Negley

    2009-01-01

    License renewal and recertification have long been standard practice in service professions. Ten years ago, a new law called for policy revision and mandated that Illinois teachers acquire continuing professional development to maintain certification. This study provides a historical perspective of the Illinois teacher recertification process,…

  6. Administrative Rules of the Illinois Community College Board.

    ERIC Educational Resources Information Center

    Illinois Community Coll. Board, Springfield.

    This document presents the administrative rules of the Illinois Community College Board (ICCB). Subpart A, the Illinois Community College Board Administration, presents items such as definition of terms, advisory groups, manuals, appearance at ICCB meetings, advisory opinions, recognition, and appeal procedure. Subpart B, Local District…

  7. Illinois Science Assessment Framework: Grades 4 and 7.

    ERIC Educational Resources Information Center

    Illinois State Board of Education, 2004

    2004-01-01

    The Illinois Science Assessment Framework is designed to assist educators, test developers, policy makers and the public by clearly defining those elements of the Illinois Learning Standards that are suitable for state testing. It is not designed to replace a local science curriculum and should not be considered a state science curriculum. The…

  8. Illinois Occupational Skill Standards: Chemical Process Technical Operators.

    ERIC Educational Resources Information Center

    Illinois Occupational Skill Standards and Credentialing Council, Carbondale.

    This document, which is intended for workforce preparation program providers, details the Illinois Occupational Skill Standards for programs preparing students for employment as chemical process technical operators. The document begins with a brief overview of the Illinois perspective on occupational skill standards and credentialing, the process…

  9. Administrative Rules of the Illinois Community College Board.

    ERIC Educational Resources Information Center

    Illinois Community Coll. Board, Springfield.

    This document is a collection of administrative rules of the Illinois Community College Board (ICCB). It is divided into seven subparts: Illinois Community College Board Administration; Local District Administration; Programs; Students; Finance; Capital Projects; and Personnel. Highlights are as follows: Independent organizations may be considered…

  10. Illinois State Library Strategic Plan: 2008-2011. Progress Report

    ERIC Educational Resources Information Center

    White, Jesse

    2009-01-01

    This paper reports the progress made by the Illinois State Library for 2008-2011. The library's achievements are presented according to the following goals: (1) Promote the use of technology to improve library services; (2) Provide leadership to the Illinois Library community to enhance library service; (3) Increase access to library services for…

  11. Accountability and Productivity: Report for the Illinois Community College System.

    ERIC Educational Resources Information Center

    Illinois Community Coll. Board, Springfield.

    Within the Illinois Community College System (ICCS), each of the 50 member colleges reports to the Illinois Community College Board (ICCB) on their productivity improvements. This report summarizes the productivity reports of the ICCS colleges, examines the results of a series of analyses of productivity conducted by the ICCB from a statewide…

  12. Illinois Association for Counseling and Development (IACD) Quarterly, 1991.

    ERIC Educational Resources Information Center

    Illovsky, M., Ed.

    1991-01-01

    This document consists of the four issues of the "IACD Quarterly" published in 1991. Articles in the 1991 volume include: (1) "The History, Current Status and Future of Counselor Preparation in Illinois: Background and Overview" (William Gorman); (2) "Counselor Education in Illinois Prior to 1958" (John Storey); (3) "The Golden Book and Counselor…

  13. Data and Characteristics of the Illinois Public Community College System

    ERIC Educational Resources Information Center

    Illinois Community College Board, 2004

    2004-01-01

    This document contains data and characteristics of the Illinois public community college system and is designed to serve as a basic reference. The data are obtained from various surveys and studies conducted by Illinois Community College Board (ICCB) staff, and from the colleges' annual MIS submissions. The document contains annual data for fiscal…

  14. 78 FR 27033 - Safety Zone; High Water Conditions; Illinois River

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-05-09

    ... Security FR Federal Register NPRM Notice of Proposed Rulemaking TFR Temporary Final Rule A. Regulatory... SECURITY Coast Guard 33 CFR Part 165 RIN 1625-AA00 Safety Zone; High Water Conditions; Illinois River... temporary safety zone on the Illinois River from Mile Marker 187.2 to Mile Marker 285.9. This zone...

  15. Illinois Institute for Rural Affairs Annual Report, 1999.

    ERIC Educational Resources Information Center

    Western Illinois Univ., Macomb. Illinois Inst. for Rural Affairs.

    The Illinois Institute for Rural Affairs (IIRA) started at Western Illinois University in 1989. An outgrowth of the population declines and economic stagnation during the early 1980s, it provides a comprehensive program of applied research, technical assistance, policy evaluation, and educational outreach to community leaders and residents in…

  16. Guidelines for Teaching and Testing the Illinois Constitution.

    ERIC Educational Resources Information Center

    Illinois State Office of the Superintendent of Public Instruction, Springfield. Instructional Services Unit.

    This document sets forth guidelines for teaching and testing public school students on the principles of democratic government as expressed in the Constitution of the United States and the Constitution of the State of Illinois. Identification is made of ways of making the examination required by the state of Illinois not only an integral part of…

  17. Illinois Occupational Skill Standards. Collision Repair Technician Cluster.

    ERIC Educational Resources Information Center

    Illinois Occupational Skill Standards and Credentialing Council, Carbondale.

    This document, which is intended as a guide for workforce preparation program providers, details the Illinois occupational skill standards for programs preparing students for employment in occupations in the (vehicle) collision repair technician cluster. It begins with a brief overview of the Illinois perspective on occupational skill standards…

  18. 77 FR 47059 - Southern Illinois Power Cooperative; Notice of Filing

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-08-07

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF ENERGY Federal Energy Regulatory Commission Southern Illinois Power Cooperative; Notice of Filing Take notice that on July 30, 2012, Southern Illinois Power Cooperative filed a Proposed Revenue Requirement for...

  19. 77 FR 61595 - Southern Illinois Power Cooperative; Notice of Filing

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-10-10

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF ENERGY Federal Energy Regulatory Commission Southern Illinois Power Cooperative; Notice of Filing Take notice that on October 1, 2012, Southern Illinois Power Cooperative filed its Revised and Superseding Proposed...

  20. 77 FR 61595 - Northern Illinois Municipal Power; Notice of Filing

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-10-10

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF ENERGY Federal Energy Regulatory Commission Northern Illinois Municipal Power; Notice of Filing October 2, 2012. Take notice that on October 1, 2012, Northern Illinois Municipal Power filed its Revised and...

  1. 78 FR 37646 - Illinois Disaster Number IL-00042

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-06-21

    ... From the Federal Register Online via the Government Publishing Office SMALL BUSINESS ADMINISTRATION Illinois Disaster Number IL-00042 AGENCY: U.S. Small Business Administration. ACTION: Amendment 1... Only for the State of Illinois (FEMA-4116-DR), dated 06/06/2013. Incident: Severe Storms,...

  2. 78 FR 42148 - Illinois Disaster Number IL-00041

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-07-15

    ... From the Federal Register Online via the Government Publishing Office SMALL BUSINESS ADMINISTRATION Illinois Disaster Number IL-00041 AGENCY: U.S. Small Business Administration. ACTION: Amendment 3... Illinois (FEMA-4116-DR), dated 05/10/ 2013. Incident: Severe Storms, Straight-line Winds and...

  3. Characteristics of Illinois School Districts That Employ School Nurses

    ERIC Educational Resources Information Center

    Searing, Lisabeth M.; Guenette, Molly

    2016-01-01

    Research indicates that school nursing services are cost-effective, but the National Association of School Nurses estimates that 25% of schools do not have a school nurse (SN). The purpose of this study was to identify the characteristics of Illinois school districts that employed SNs. This was a secondary data analysis of Illinois School Report…

  4. Illinois Secondary School Course Offerings, 1982. Special Report on Science.

    ERIC Educational Resources Information Center

    Hamilton, Donald K.

    This report synthesizes the findings of the Illinois statewide curriculum census projects of 1977 and 1982. The census was designed to produce normative data relative to offerings and enrollments in Illinois public secondary schools and establish a source of information on secondary school curriculum. Statistical information include: (1)…

  5. Illinois Occupational Skill Standards: Clinical Laboratory Science/Biotechnology Cluster.

    ERIC Educational Resources Information Center

    Illinois Occupational Skill Standards and Credentialing Council, Carbondale.

    This document, which is intended to serve as a guide for workforce preparation program providers, details the Illinois Occupational Skill Standards for clinical laboratory occupations programs. The document begins with a brief overview of the Illinois perspective on occupational skill standards and credentialing, the process used to develop the…

  6. Illinois Community College System. Performance Report For Fiscal Year 2004

    ERIC Educational Resources Information Center

    Illinois Community College Board, 2004

    2004-01-01

    The Illinois Community College System Performance Report replaces the Results Report and reflects an initial effort to increasingly streamline and integrate state outcomes and progress reporting in Illinois. The fresh approach taken this year further combines qualitative information and quantitative data reporting. The Performance Report is…

  7. Hispanic Superintendents in Illinois: Current Trends and Challenges

    ERIC Educational Resources Information Center

    Espinoza, Ricardo

    2012-01-01

    The trends and challenges faced by Hispanic superintendents in Illinois are stated and analyzed throughout the study in both literature and practice. The examined items centered on the issues of hiring experiences and other barriers associated with the acquisition and longevity of the superintendency in Illinois. Data for the study were collected…

  8. Research on improved and enhanced oil recovery in Illinois through reservoir characterization

    SciTech Connect

    Oltz, D.F.

    1992-01-01

    This project will provide information that can maximize hydrocarbon production minimize formation damage and stimulate new production in Illinois. Such information includes definition of hydrocarbon resources, characterization of hydrocarbon reservoirs, and the implementation of methods that will improve hydrocarbon extractive technology. Increased understanding of reservoir heterogeneities that affect oil recovery can aid in identifying producible resources. The transfer of technology to industry and the general public is a significant component of the program. The project is designed to examine selected subsurface oil reservoirs in Illinois. Scientists use advanced scientific techniques to gain a better understanding of reservoir components and behavior and address ways of potentially increasing the amount of recoverable oil. Initial production rates for wells in the Illinois Basin commonly decline quite rapidly and as much as 60 percent of the oil in place can be unrecoverable using standard operating procedures. Heterogeneities (geological differences in reservoir make-up) affect a reservoir's capability to release fluids. By-passed mobile and immobile oil remain in the reservoir. To learn how to get more of the oil out of reservoirs, the ISGS is studying the nature of reservoir rock heterogeneities and their control on the distribution and production of by-passed, mobile oil.

  9. A nanobursa mesh: a graded electrospun nanofiber mesh with metal nanoparticles on carbon nanotubes

    NASA Astrophysics Data System (ADS)

    Senturk-Ozer, Semra; Chen, Tao; Degirmenbasi, Nebahat; Gevgilili, Halil; Podkolzin, Simon G.; Kalyon, Dilhan M.

    2014-07-01

    A new type of material, a ``nanobursa'' mesh (from ``bursa'' meaning ``sac or pouch''), is introduced. This material consists of sequential layers of porous polymeric nanofibers encapsulating carbon nanotubes, which are functionalized with different metal nanoparticles in each layer. The nanobursa mesh is fabricated via a novel combination of twin-screw extrusion and electrospinning. Use of this hybrid process at industrially-relevant rates is demonstrated by producing a nanobursa mesh with graded layers of Pd, Co, Ag, and Pt nanoparticles. The potential use of the fabricated nanobursa mesh is illustrated by modeling of catalytic hydrocarbon oxidation.A new type of material, a ``nanobursa'' mesh (from ``bursa'' meaning ``sac or pouch''), is introduced. This material consists of sequential layers of porous polymeric nanofibers encapsulating carbon nanotubes, which are functionalized with different metal nanoparticles in each layer. The nanobursa mesh is fabricated via a novel combination of twin-screw extrusion and electrospinning. Use of this hybrid process at industrially-relevant rates is demonstrated by producing a nanobursa mesh with graded layers of Pd, Co, Ag, and Pt nanoparticles. The potential use of the fabricated nanobursa mesh is illustrated by modeling of catalytic hydrocarbon oxidation. Electronic supplementary information (ESI) available: Experimental methods and computational details. See DOI: 10.1039/c4nr01145g

  10. Structured adaptive mesh refinement on the connection machine

    SciTech Connect

    Berger, M.J. . Courant Inst. of Mathematical Sciences); Saltzman, J.S. )

    1993-01-01

    Adaptive mesh refinement has proven itself to be a useful tool in a large collection of applications. By refining only a small portion of the computational domain, computational savings of up to a factor of 80 in 3 dimensional calculations have been obtained on serial machines. A natural question is, can this algorithm be used on massively parallel machines and still achieve the same efficiencies We have designed a data layout scheme for mapping grid points to processors that preserves locality and minimizes global communication for the CM-200. The effect of the data layout scheme is that at the finest level nearby grid points from adjacent grids in physical space are in adjacent memory locations. Furthermore, coarse grid points are arranged in memory to be near their associated fine grid points. We show applications of the algorithm to inviscid compressible fluid flow in two space dimensions.

  11. Conservative interpolation between general spherical meshes

    NASA Astrophysics Data System (ADS)

    Kritsikis, E.; Aechtner, M.; Meurdesoif, Y.; Dubos, T.

    2015-06-01

    An efficient, local, explicit, second-order, conservative interpolation algorithm between spherical meshes is presented. The cells composing the source and target meshes may be either spherical polygons or longitude-latitude quadrilaterals. Second-order accuracy is obtained by piecewise-linear finite volume reconstruction over the source mesh. Global conservation is achieved through the introduction of a supermesh, whose cells are all possible intersections of source and target cells. Areas and intersections are computed exactly to yield a geometrically exact method. The main efficiency bottleneck caused by the construction of the supermesh is overcome by adopting tree-based data structures and algorithms, from which the mesh connectivity can also be deduced efficiently. The theoretical second-order accuracy is verified using a smooth test function and pairs of meshes commonly used for atmospheric modelling. Experiments confirm that the most expensive operations, especially the supermesh construction, have O(NlogN) computational cost. The method presented is meant to be incorporated in pre- or post-processing atmospheric modelling pipelines, or directly into models for flexible input/output. It could also serve as a basis for conservative coupling between model components, e.g. atmosphere and ocean.

  12. Light weight meshes in incisional hernia repair

    PubMed Central

    Schumpelick, Volker; Klinge, Uwe; Rosch, Raphael; Junge, Karsten

    2006-01-01

    Incisional hernias remain one of the most common surgical complications with a long-term incidence of 10–20%. Increasing evidence of impaired wound healing in these patients supports routine use of an open prefascial, retromuscular mesh repair. Basic pathophysiologic principles dictate that for a successful long-term outcome and prevention of recurrence, a wide overlap underneath healthy tissue is required. Particularly in the neighborhood of osseous structures, only retromuscular placement allows sufficient subduction of the mesh by healthy tissue of at least 5 cm in all directions. Preparation must take into account the special anatomic features of the abdominal wall, especially in the area of the Linea alba and Linea semilunaris. Polypropylene is the material widely used for open mesh repair. New developments have led to low-weight, large-pore polypropylene prostheses, which are adjusted to the physiological requirements of the abdominal wall and permit proper tissue integration. These meshes provide the possibility of forming a scar net instead of a stiff scar plate and therefore help to avoid former known mesh complications. PMID:21187980

  13. Mesh insertion as an aid for pleurodesis.

    PubMed

    Sugarmann, W M; Widmann, W D; Mysh, D; Sattari, R

    1996-12-01

    With the application of video-assisted thoracic surgery (VATS) for the treatment of pneumothorax, there has been an increase in the failure rate of treatment because of inadequate pleurodesis. We sought to determine whether mesh insertion into the pleural cavity with or without pleural abrasion results in predictable pleurodesis appropriate for clinical trial as an adjunct to VATS treatment of pneumothorax. There have been no prior studies on the use of absorbable or nonabsorbable mesh in the thoracic cavity. The effects of intra-thoracic absorbable polyglactin (Vicryl) and non-absorbable polypropylene (Marlex) mesh were studied in rats. Polyglactin without abrasion caused filmy adhesions in 5/5, 1/7, and 0/5 rats studied at 1, 2, and 3 months. Polypropylene incites an extensive and dense pleural reaction not suitable for clinical use becaues it induces a fibrothorax. Pleural abrasion alone caused variable adhesions studied at 3-4 months (4/6 none, 1/6 filmy, 1/6 firm). Polyglactin plus pleural abrasion resulted in appropriate firm adhesions in 7/8 rats studied at 3-4 months with 1/8 showing filmy adhesions. Polyglactin alone results in transient filmy adhesions. Pleural abrasion alone results in inadequate pleural symphysis. However, when absorbable mesh insertion is coupled with pleural abrasion, appropriate pleurodesis is predictably achieved. Clinical application of polyglactin mesh insertion with pleural abrasion as an adjunct in the VATS treatment of pneumothorax has begun and has been successful. PMID:10064371

  14. Floating shock fitting via Lagrangian adaptive meshes

    NASA Technical Reports Server (NTRS)

    Vanrosendale, John

    1994-01-01

    In recent works we have formulated a new approach to compressible flow simulation, combining the advantages of shock-fitting and shock-capturing. Using a cell-centered Roe scheme discretization on unstructured meshes, we warp the mesh while marching to steady state, so that mesh edges align with shocks and other discontinuities. This new algorithm, the Shock-fitting Lagrangian Adaptive Method (SLAM) is, in effect, a reliable shock-capturing algorithm which yields shock-fitted accuracy at convergence. Shock-capturing algorithms like this, which warp the mesh to yield shock-fitted accuracy, are new and relatively untried. However, their potential is clear. In the context of sonic booms, accurate calculation of near-field sonic boom signatures is critical to the design of the High Speed Civil Transport (HSCT). SLAM should allow computation of accurate N-wave pressure signatures on comparatively coarse meshes, significantly enhancing our ability to design low-boom configurations for high-speed aircraft.

  15. Handbook for Illinois Public Community Colleges and Illinois Prime Sponsors Under the Comprehensive Employment and Training Act (CETA).

    ERIC Educational Resources Information Center

    Illinois Community Coll. Board, Springfield.

    This handbook provides an overview of the Comprehensive Employment and Training Act (CETA) legislation, the Illinois Public Community College system, and provides the mechanics for the development of contracts for training and services by Illinois community colleges. It includes the following: (1) a summary of each of the eight titles of CETA, and…

  16. Analysis of the 1981/82 HEGIS/LIBGIS Responses of Illinois Academic Libraries. Illinois Library Statistical Report 9.

    ERIC Educational Resources Information Center

    Phenix, Katharine

    One of a series of annual studies undertaken by the Library Research Center for and on behalf of the Illinois State Library, this report provides a detailed, question-by-question examination of the 143 responses (84% of the 170 Illinois academic libraries polled) to the 1981/82 Higher Education General Information Survey/Library General…

  17. 78 FR 68903 - Dynegy Inc., Illinois Power Holdings, LLC and Illinois Power Holdings II, LLC-Acquisition of...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-11-15

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF TRANSPORTATION Surface Transportation Board Dynegy Inc., Illinois Power Holdings, LLC and Illinois Power Holdings II, LLC... filed with the Surface Transportation Board, 395 E Street SW., Washington, DC 20423-0001. In addition,...

  18. 34 CFR 200.92-200.99 - [Reserved

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 34 Education 1 2010-07-01 2010-07-01 false 200.92-200.99 Section 200.92-200.99 Education Regulations of the Offices of the Department of Education OFFICE OF ELEMENTARY AND SECONDARY EDUCATION, DEPARTMENT OF EDUCATION TITLE I-IMPROVING THE ACADEMIC ACHIEVEMENT OF THE DISADVANTAGED Prevention...

  19. 34 CFR 200.101-200.102 - [Reserved

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 34 Education 1 2010-07-01 2010-07-01 false 200.101-200.102 Section 200.101-200.102 Education Regulations of the Offices of the Department of Education OFFICE OF ELEMENTARY AND SECONDARY EDUCATION, DEPARTMENT OF EDUCATION TITLE I-IMPROVING THE ACADEMIC ACHIEVEMENT OF THE DISADVANTAGED General...

  20. 34 CFR 200.68-200.69 - [Reserved

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 34 Education 1 2010-07-01 2010-07-01 false 200.68-200.69 Section 200.68-200.69 Education Regulations of the Offices of the Department of Education OFFICE OF ELEMENTARY AND SECONDARY EDUCATION, DEPARTMENT OF EDUCATION TITLE I-IMPROVING THE ACADEMIC ACHIEVEMENT OF THE DISADVANTAGED Improving...

  1. 34 CFR 200.104-200.109 - [Reserved

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 34 Education 1 2010-07-01 2010-07-01 false 200.104-200.109 Section 200.104-200.109 Education Regulations of the Offices of the Department of Education OFFICE OF ELEMENTARY AND SECONDARY EDUCATION, DEPARTMENT OF EDUCATION TITLE I-IMPROVING THE ACADEMIC ACHIEVEMENT OF THE DISADVANTAGED General...

  2. 34 CFR 200.23-200.24 - [Reserved

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 34 Education 1 2010-07-01 2010-07-01 false 200.23-200.24 Section 200.23-200.24 Education Regulations of the Offices of the Department of Education OFFICE OF ELEMENTARY AND SECONDARY EDUCATION, DEPARTMENT OF EDUCATION TITLE I-IMPROVING THE ACADEMIC ACHIEVEMENT OF THE DISADVANTAGED Improving...

  3. NASA Lewis Meshed VSAT Workshop meeting summary

    NASA Technical Reports Server (NTRS)

    Ivancic, William

    1993-01-01

    NASA Lewis Research Center's Space Electronics Division (SED) hosted a workshop to address specific topics related to future meshed very small-aperture terminal (VSAT) satellite communications networks. The ideas generated by this workshop will help to identify potential markets and focus technology development within the commercial satellite communications industry and NASA. The workshop resulted in recommendations concerning these principal points of interest: the window of opportunity for a meshed VSAT system; system availability; ground terminal antenna sizes; recommended multifrequency for time division multiple access (TDMA) uplink; a packet switch design concept for narrowband; and fault tolerance design concepts. This report presents a summary of group presentations and discussion associated with the technological, economic, and operational issues of meshed VSAT architectures that utilize processing satellites.

  4. Performance of a streaming mesh refinement algorithm.

    SciTech Connect

    Thompson, David C.; Pebay, Philippe Pierre

    2004-08-01

    In SAND report 2004-1617, we outline a method for edge-based tetrahedral subdivision that does not rely on saving state or communication to produce compatible tetrahedralizations. This report analyzes the performance of the technique by characterizing (a) mesh quality, (b) execution time, and (c) traits of the algorithm that could affect quality or execution time differently for different meshes. It also details the method used to debug the several hundred subdivision templates that the algorithm relies upon. Mesh quality is on par with other similar refinement schemes and throughput on modern hardware can exceed 600,000 output tetrahedra per second. But if you want to understand the traits of the algorithm, you have to read the report!

  5. GRChombo: Numerical relativity with adaptive mesh refinement

    NASA Astrophysics Data System (ADS)

    Clough, Katy; Figueras, Pau; Finkel, Hal; Kunesch, Markus; Lim, Eugene A.; Tunyasuvunakool, Saran

    2015-12-01

    In this work, we introduce {\\mathtt{GRChombo}}: a new numerical relativity code which incorporates full adaptive mesh refinement (AMR) using block structured Berger-Rigoutsos grid generation. The code supports non-trivial 'many-boxes-in-many-boxes' mesh hierarchies and massive parallelism through the message passing interface. {\\mathtt{GRChombo}} evolves the Einstein equation using the standard BSSN formalism, with an option to turn on CCZ4 constraint damping if required. The AMR capability permits the study of a range of new physics which has previously been computationally infeasible in a full 3 + 1 setting, while also significantly simplifying the process of setting up the mesh for these problems. We show that {\\mathtt{GRChombo}} can stably and accurately evolve standard spacetimes such as binary black hole mergers and scalar collapses into black holes, demonstrate the performance characteristics of our code, and discuss various physics problems which stand to benefit from the AMR technique.

  6. The generation of hexahedral meshes for assembly geometries: A survey

    SciTech Connect

    TAUTGES,TIMOTHY J.

    2000-02-14

    The finite element method is being used today to model component assemblies in a wide variety of application areas, including structural mechanics, fluid simulations, and others. Generating hexahedral meshes for these assemblies usually requires the use of geometry decomposition, with different meshing algorithms applied to different regions. While the primary motivation for this approach remains the lack of an automatic, reliable all-hexahedral meshing algorithm, requirements in mesh quality and mesh configuration for typical analyses are also factors. For these reasons, this approach is also sometimes required when producing other types of unstructured meshes. This paper will review progress to date in automating many parts of the hex meshing process, which has halved the time to produce all-hex meshes for large assemblies. Particular issues which have been exposed due to this progress will also be discussed, along with their applicability to the general unstructured meshing problem.

  7. Cardiovascular and lung mesh generation based on centerlines.

    PubMed

    Marchandise, E; Geuzaine, C; Remacle, J F

    2013-06-01

    We present a fully automatic procedure for the mesh generation of tubular geometries such as blood vessels or airways. The procedure is implemented in the open-source Gmsh software and relies on a centerline description of the input geometry. The presented method can generate different type of meshes: isotropic tetrahedral meshes, anisotropic tetrahedral meshes, and mixed hexahedral/tetrahedral meshes. Additionally, a multiple layered arterial wall can be generated with a variable thickness. All the generated meshes rely on a mesh size field and a mesh metric that is based on centerline descriptions, namely the distance to the centerlines and a local reference system based on the tangent and the normal directions to the centerlines. Different examples show that the proposed method is very efficient and robust and leads to high quality computational meshes. PMID:23606344

  8. Gasification coprocessing of Illinois Basin coal and RDF

    SciTech Connect

    Choudhry, V.; Kwan, S.; Pisupati, S.; Klima, M.; Banerjee, D.D.

    1998-12-31

    Gasification coprocessing of refuse-derived fuel (RDF) with coal was investigated with the objective of increasing the utilization of high-sulfur Illinois Basin coals and municipal solid waste (MSW) in an environmentally acceptable manner. MSW is a major recurring solid waste whose disposal entails tipping fees of $30--$40/ton, and poses long-term environmental problems. MSW is routinely processed to recover plastics, aluminum, and other metals as part of state-mandated recycling requirements. Following removal of noncombustibles, the remaining material, primarily paper and food wastes, is shredded to produce RDF fluff which has an as-received calorific value of {approximately} 6,000 Btu/lb. The research addressed the problems of size reduction of RDF fluff (an essential step in making a gasifier feed slurry) and production of a pumpable slurry using additives to maximize coal and RDF solids loading. Gasification evaluation of a 60% solids coal/RDF slurry was conducted in an entrained-flow, oxygen-blown, atmospheric pressure, 0.5 million Btu/h research gasifier. High carbon conversion was achieved, and the product gases contained no furans.

  9. A biotic survey of Lovets Pond, Jackson County, Illinois

    SciTech Connect

    Peterson, M.J.

    1988-12-01

    Systematic collecting of the vascular flora, fishes, and aquatic macroinvertebrates in a natural floodplain pond ecosystem in Jackson County, Illinois, yielded 328, 17, and 93 taxa, respectively. The habitat and relative abundance of each collected specimen were recorded. Five distinct natural communities were identified in the 60-ha ecosystem and were described in detail, namely, pond, shrub swamp, true swamp, marsh, and wet-mesic flood-plain forest. With the exception of the floodplain forest all natural communities at the site were rare in the region, largely due to the extensive wetland drainage and land clearing for agricultural use. Slight disturbance to the study area appear to have had little significant impact on the site's overall natural quality. The character of the system compared favorably with the earliest known presettlement descriptions. The privately owned natural area is endangered because of the likelihood of draining and clearing for agriculture. Based on this study the site is a significant natural area of preservation. 22 refs., 5 figs.

  10. Multigrid solution strategies for adaptive meshing problems

    NASA Technical Reports Server (NTRS)

    Mavriplis, Dimitri J.

    1995-01-01

    This paper discusses the issues which arise when combining multigrid strategies with adaptive meshing techniques for solving steady-state problems on unstructured meshes. A basic strategy is described, and demonstrated by solving several inviscid and viscous flow cases. Potential inefficiencies in this basic strategy are exposed, and various alternate approaches are discussed, some of which are demonstrated with an example. Although each particular approach exhibits certain advantages, all methods have particular drawbacks, and the formulation of a completely optimal strategy is considered to be an open problem.

  11. Arbitrary Lagrangian Eulerian Adaptive Mesh Refinement

    2009-09-29

    This is a simulation code involving an ALE (arbitrary Lagrangian-Eulerian) hydrocode with AMR (adaptive mesh refinement) and pluggable physics packages for material strength, heat conduction, radiation diffusion, and laser ray tracing developed a LLNL, UCSD, and Berkeley Lab. The code is an extension of the open source SAMRAI (Structured Adaptive Mesh Refinement Application Interface) code/library. The code can be used in laser facilities such as the National Ignition Facility. The code is alsi being appliedmore » to slurry flow (landslides).« less

  12. Unstructured Adaptive Meshes: Bad for Your Memory?

    NASA Technical Reports Server (NTRS)

    Biswas, Rupak; Feng, Hui-Yu; VanderWijngaart, Rob

    2003-01-01

    This viewgraph presentation explores the need for a NASA Advanced Supercomputing (NAS) parallel benchmark for problems with irregular dynamical memory access. This benchmark is important and necessary because: 1) Problems with localized error source benefit from adaptive nonuniform meshes; 2) Certain machines perform poorly on such problems; 3) Parallel implementation may provide further performance improvement but is difficult. Some examples of problems which use irregular dynamical memory access include: 1) Heat transfer problem; 2) Heat source term; 3) Spectral element method; 4) Base functions; 5) Elemental discrete equations; 6) Global discrete equations. Nonconforming Mesh and Mortar Element Method are covered in greater detail in this presentation.

  13. Shuffle-exchanges on augmented meshes

    NASA Technical Reports Server (NTRS)

    Bokhari, S. H.

    1984-01-01

    A mesh connected array of size N = two to the Kth power, K an integer, can be augmented by adding at most one edge per node such that it can perform a shuffle-exchange of size N/2 in constant time. A shuffle-exchange of size N is performed on this augmented array in constant time. This is done by combining the available perfect shuffle of size N/2 with the existing nearest neighbor connections of the mesh. By carefully scheduling the different permutations that are composed in order to achieve the shuffle, the time required is reduced to 5 steps, which is optimal for this network.

  14. 77 FR 8865 - Public Water System Supervision Program Approval for the State of Illinois; Tentative Approval

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-02-15

    ... Program. Illinois is applying its Long Term 2 Enhanced Surface Water Treatment Regulations to all Illinois..., thereby satisfying the requirements of the Long-Term 2 Enhanced Surface Water Treatment Rule. Illinois is.... Therefore, EPA intends to award primacy to Illinois for Long-Term 2 Enhanced Surface Water Treatment...

  15. Preparing Principals for Success with English Language Learners: Challenges and Opportunities in Illinois

    ERIC Educational Resources Information Center

    Reeves, Alison; Van Tuyle, Vicki

    2014-01-01

    This paper explores the challenges and opportunities of the English Language Learner (ELL) components of Illinois' new principal preparation legislation [Illinois Public Act 96-0903]. In 2011, Illinois passed Illinois Public Act 96-0903 creating new rules for principal preparation programs requiring institutions or organizations certifying…

  16. 78 FR 48103 - Approval and Promulgation of Air Quality Implementation Plans; Illinois; Redesignation of the...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-08-07

    ...EPA is proposing to grant a redesignation request and State Implementation Plan (SIP) revision request submitted by the state of Illinois on October 15, 2010, and supplemented on September 16, 2011, and May 6, 2013. The Illinois Environmental Protection Agency (IEPA) requested EPA to redesignate the Illinois portion of the Chicago-Gary- Lake County, Illinois-Indiana (IL-IN) nonattainment area......

  17. 78 FR 28832 - CenterPoint Energy-Illinois Gas Transmission Company; Notice of Filing

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-05-16

    ... Federal Energy Regulatory Commission CenterPoint Energy--Illinois Gas Transmission Company; Notice of Filing Take notice that on May 6, 2013, CenterPoint Energy--Illinois Gas Transmission Company (IGTC... CenterPoint Energy-Illinois Gas Transmission Company to CenterPoint Energy-Illinois Gas...

  18. Leakage Risk Assessment of CO{sub 2} Transportation by Pipeline at the Illinois Basin Decatur Project, Decatur, Illinois

    SciTech Connect

    Mazzoldi, A.; Oldenburg, C. M.

    2013-12-17

    The Illinois Basin Decatur Project (IBDP) is designed to confirm the ability of the Mt. Simon Sandstone, a major regional saline-water-bearing formation in the Illinois Basin, to store 1 million tons of carbon dioxide (CO{sub 2}) injected over a period of three years. The CO{sub 2} will be provided by Archer Daniels Midland (ADM) from its Decatur, Illinois, ethanol plant. In order to transport CO{sub 2} from the capture facility to the injection well (also located within the ADM plant boundaries), a high-pressure pipeline of length 3,200 ft (975 m) has been constructed, running above the ground surface within the ADM plant footprint. We have qualitatively evaluated risks associated with possible pipeline failure scenarios that lead to discharge of CO{sub 2} within the real-world environment of the ADM plant in which there are often workers and visitors in the vicinity of the pipeline. There are several aspects of CO{sub 2} that make its transportation and potential leakage somewhat different from other substances, most notable is its non-flammability and propensity to change to solid (dry ice) upon strong decompression. In this study, we present numerical simulations using Computational Fluid Dynamics (CFD) methods of the release and dispersion of CO{sub 2} from individual hypothetical pipeline failures (i.e., leaks). Failure frequency of the various components of a pipeline transportation system over time are taken from prior work on general pipeline safety and leakage modeling and suggest a 4.65% chance of some kind of pipeline failure over the three-years of operation. Following the Precautionary Principle (see below), we accounted for full-bore leakage scenarios, where the temporal evolution of the mass release rate from the high-pressure pipeline leak locations was simulated using a state-of-the-art Pipe model which considers the thermodynamic effects of decompression in the entire pipeline. Failures have been simulated at four representative locations along

  19. Illinois Precipitation Research: A Focus on Cloud and Precipitation Modification.

    NASA Astrophysics Data System (ADS)

    Changnon, Stanley A.; Czys, Robert R.; Scott, Robert W.; Westcott, Nancy E.

    1991-05-01

    At the heart of the 40-year atmospheric research endeavors of the Illinois State Water Survey have been studies to understand precipitation processes in order to learn how precipitation is modified purposefully and accidentally, and to measure the physical and socio-economic consequences of cloud and precipitation modification. Major field and laboratory activities of past years or briefly treated as a basis for describing the key findings of the past ten years. Recent studies of inadvertent and purposeful cloud and rain modification and their effects are emphasized, including a 1989 field project conducted in Illinois and key findings from an on-going exploratory experiment addressing cloud and rain modification. Results are encouraging for the use of dynamic seeding on summer cumuliform clouds of the Midwest.Typical in-cloud results at 10°C reveal multiple updrafts that tend to be filled with large amounts of supercooled drizzle and raindrops. Natural ice production is vigorous, and initial concentrations are larger than expected from ice nuclei. However, natural ice production is not so vigorous as to preclude opportunities for seeding. Radar-based studies of such clouds reveal that their echo cores usually can be identified prior to desired seeding times, which is significant for the evaluation of their behavior. Cell characteristics show considerable variance under different types of meteorological conditions. Analysis of cell mergers reveals that under conditions of weak vertical shear, mid-level intercell flow at 4 km occurs as the reflectivity bridge between cells rapidly intensifies. The degree of intensification of single-echo cores after they merge is strongly related to the age and vigor of the cores before they join. Hence, cloud growth may be enhanced if seeding can encourage echo cores to merge at critical times. Forecasting research has developed a technique for objectively distinguishing between operational seeding and nonoperational days and for

  20. An Assessment of Geological Carbon Sequestration Options in the Illinois Basin

    SciTech Connect

    Robert Finley

    2005-09-30

    The Midwest Geological Sequestration Consortium (MGSC) has investigated the options for geological carbon dioxide (CO{sub 2}) sequestration in the 155,400-km{sup 2} (60,000-mi{sup 2}) Illinois Basin. Within the Basin, underlying most of Illinois, western Indiana, and western Kentucky, are relatively deeper and/or thinner coal resources, numerous mature oil fields, and deep salt-water-bearing reservoirs that are potentially capable of storing CO{sub 2}. The objective of this Assessment was to determine the technical and economic feasibility of using these geological sinks for long-term storage to avoid atmospheric release of CO{sub 2} from fossil fuel combustion and thereby avoid the potential for adverse climate change. The MGSC is a consortium of the geological surveys of Illinois, Indiana, and Kentucky joined by six private corporations, five professional business associations, one interstate compact, two university researchers, two Illinois state agencies, and two consultants. The purpose of the Consortium is to assess carbon capture, transportation, and storage processes and their costs and viability in the three-state Illinois Basin region. The Illinois State Geological Survey serves as Lead Technical Contractor for the Consortium. The Illinois Basin region has annual emissions from stationary anthropogenic sources exceeding 276 million metric tonnes (304 million tons) of CO{sub 2} (>70 million tonnes (77 million tons) carbon equivalent), primarily from coal-fired electric generation facilities, some of which burn almost 4.5 million tonnes (5 million tons) of coal per year. Assessing the options for capture, transportation, and storage of the CO{sub 2} emissions within the region has been a 12-task, 2-year process that has assessed 3,600 million tonnes (3,968 million tons) of storage capacity in coal seams, 140 to 440 million tonnes (154 to 485 million tons) of capacity in mature oil reservoirs, 7,800 million tonnes (8,598 million tons) of capacity in saline

  1. Development of a Massively Parallel Particle-Mesh Algorithm for Simulations of Galaxy Dynamics and Plasmas

    NASA Astrophysics Data System (ADS)

    Wallin, John

    1996-01-01

    Particle-mesh calculations treat forces and potentials as field quantities which are represented approximately on a mesh. A system of particles is mapped onto this mesh as a density distribution of mass or charge. The Fourier transform is used to convolve this distribution with the Green's function of the potential, and a finite difference scheme is used to calculate the forces acting on the particles. The computation time scales as the Ng log Ng, where Ng is the size of the computational grid. In contrast, the particle-particle method's computing time relies on direct summation, so the time for each calculation is given by Np2, where Np is the number of particles. The particle-mesh method is best suited for simulations with a fixed minimum resolution and for collisionless systems, while hierarchical tree codes have proven to be superior for collisional systems where two-body interactions are important. Particle mesh methods still dominate in plasma physics where collisionless systems are modeled. The CM-200 Connection Machine produced by Thinking Machines Corp. is a data parallel system. On this system, the front-end computer controls the timing and execution of the parallel processing units. The programming paradigm is Single-Instruction, Multiple Data (SIMD). The processors on the CM-200 are connected in an N-dimensional hypercube; the largest number of links a message will ever have to make is N. As in all parallel computing, the efficiency of an algorithm is primarily determined by the fraction of the time spent communicating compared to that spent computing. Because of the topology of the processors, nearest neighbor communication is more efficient than general communication.

  2. FEATURE-BASED MULTIBLOCK FINITE ELEMENT MESH GENERATION

    PubMed Central

    Shivanna, Kiran H.; Tadepalli, Srinivas C.; Grosland, Nicole M.

    2010-01-01

    Hexahedral finite element mesh development for anatomic structures and biomedical implants can be cumbersome. Moreover, using traditional meshing techniques, detailed features may be inadequately captured. In this paper, we describe methodologies to handle multi-feature datasets (i.e., feature edges and surfaces). Coupling multi-feature information with multiblock meshing techniques has enabled anatomic structures, as well as orthopaedic implants, to be readily meshed. Moreover, the projection process, node and element set creation are automated, thus reducing the user interaction during model development. To improve the mesh quality, Laplacian- and optimization-based mesh improvement algorithms have been adapted to the multi-feature datasets. PMID:21076650

  3. Highly Symmetric and Congruently Tiled Meshes for Shells and Domes

    PubMed Central

    Rasheed, Muhibur; Bajaj, Chandrajit

    2016-01-01

    We describe the generation of all possible shell and dome shapes that can be uniquely meshed (tiled) using a single type of mesh face (tile), and following a single meshing (tiling) rule that governs the mesh (tile) arrangement with maximal vertex, edge and face symmetries. Such tiling arrangements or congruently tiled meshed shapes, are frequently found in chemical forms (fullerenes or Bucky balls, crystals, quasi-crystals, virus nano shells or capsids), and synthetic shapes (cages, sports domes, modern architectural facades). Congruently tiled meshes are both aesthetic and complete, as they support maximal mesh symmetries with minimal complexity and possess simple generation rules. Here, we generate congruent tilings and meshed shape layouts that satisfy these optimality conditions. Further, the congruent meshes are uniquely mappable to an almost regular 3D polyhedron (or its dual polyhedron) and which exhibits face-transitive (and edge-transitive) congruency with at most two types of vertices (each type transitive to the other). The family of all such congruently meshed polyhedra create a new class of meshed shapes, beyond the well-studied regular, semi-regular and quasi-regular classes, and their duals (platonic, Catalan and Johnson). While our new mesh class is infinite, we prove that there exists a unique mesh parametrization, where each member of the class can be represented by two integer lattice variables, and moreover efficiently constructable. PMID:27563368

  4. 50 CFR 300.110 - Mesh size.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... indication of the width may appear at regular intervals other than 1 mm. (2) Use of the gauge. (i) The net... direction perpendicular to the plane of the net. (iii) The gauge may be inserted into the mesh opening either with a manual force or using a weight or dynamometer, until it is stopped at the tapering edges...

  5. 50 CFR 300.110 - Mesh size.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... indication of the width may appear at regular intervals other than 1 mm. (2) Use of the gauge. (i) The net... direction perpendicular to the plane of the net. (iii) The gauge may be inserted into the mesh opening either with a manual force or using a weight or dynamometer, until it is stopped at the tapering edges...

  6. Functionalized Nanofiber Meshes Enhance Immunosorbent Assays.

    PubMed

    Hersey, Joseph S; Meller, Amit; Grinstaff, Mark W

    2015-12-01

    Three-dimensional substrates with high surface-to-volume ratios and subsequently large protein binding capacities are of interest for advanced immunosorbent assays utilizing integrated microfluidics and nanosensing elements. A library of bioactive and antifouling electrospun nanofiber substrates, which are composed of high-molecular-weight poly(oxanorbornene) derivatives, is described. Specifically, a set of copolymers are synthesized from three 7-oxanorbornene monomers to create a set of water insoluble copolymers with both biotin (bioactive) and triethylene glycol (TEG) (antifouling) functionality. Porous three-dimensional nanofiber meshes are electrospun from these copolymers with the ability to specifically bind streptavidin while minimizing the nonspecific binding of other proteins. Fluorescently labeled streptavidin is used to quantify the streptavidin binding capacity of each mesh type through confocal microscopy. A simplified enzyme-linked immunosorbent assay (ELISA) is presented to assess the protein binding capabilities and detection limits of these nanofiber meshes under both static conditions (26 h) and flow conditions (1 h) for a model target protein (i.e., mouse IgG) using a horseradish peroxidase (HRP) colorimetric assay. Bioactive and antifouling nanofiber meshes outperform traditional streptavidin-coated polystyrene plates under flow, validating their use in future advanced immunosorbent assays and their compatibility with microfluidic-based biosensors. PMID:26551162

  7. Gravitational Collapse With Distributed Adaptive Mesh Refinement

    NASA Astrophysics Data System (ADS)

    Liebling, Steven; Lehner, Luis; Motl, Patrick; Neilsen, David; Rahman, Tanvir; Reula, Oscar

    2006-04-01

    Gravitational collapse is studied using distributed adaptive mesh refinement (AMR). The AMR infrastructure includes a novel treatment of adaptive boundaries which allows for high orders of accuracy. Results of the collapse of Brill waves to black holes are presented. Combining both vertex centered and cell centered fields in the same evolution is discussed.

  8. The Factory Approach to Creating TSTT Meshes

    SciTech Connect

    Epperly, T

    2003-10-21

    The factory approach (a.k.a. virtual constructor) hides the details of the class implementing the TSTT from TSTT users. In version 0.5 of TSTT.sidl, the client hard codes the name of the implementing class into their code. The client is forced to choose from the small set of possible concrete classes defined in TSTT.sidl. This approach makes it impossible to support multiple implementations of the TSTT in a single process because each implementation has to implement the same class. The factory approach hides the details of mesh creation from the client. The client does not need to know the name of the implementing class, and the client can dynamically determine which interfaces are supported by the new mesh. A factory can support multiple TSTT implementation because each implementation defines its own concrete classes to implement. The factory approach does require the TSTT compliant mesh packages to implement a MeshFactory interface, and everyone needs to link against an implementation of the Registry. The Registry only has 7 methods that are fairly easy to implement, and everyone can share one implementation of the Registry.

  9. Details of tetrahedral anisotropic mesh adaptation

    NASA Astrophysics Data System (ADS)

    Jensen, Kristian Ejlebjerg; Gorman, Gerard

    2016-04-01

    We have implemented tetrahedral anisotropic mesh adaptation using the local operations of coarsening, swapping, refinement and smoothing in MATLAB without the use of any for- N loops, i.e. the script is fully vectorised. In the process of doing so, we have made three observations related to details of the implementation: 1. restricting refinement to a single edge split per element not only simplifies the code, it also improves mesh quality, 2. face to edge swapping is unnecessary, and 3. optimising for the Vassilevski functional tends to give a little higher value for the mean condition number functional than optimising for the condition number functional directly. These observations have been made for a uniform and a radial shock metric field, both starting from a structured mesh in a cube. Finally, we compare two coarsening techniques and demonstrate the importance of applying smoothing in the mesh adaptation loop. The results pertain to a unit cube geometry, but we also show the effect of corners and edges by applying the implementation in a spherical geometry.

  10. Manning's roughness coefficient for Illinois streams

    USGS Publications Warehouse

    Soong, David T.; Prater, Crystal D.; Halfar, Teresa M.; Wobig, Loren A.

    2012-01-01

    Manning's roughness coefficients for 43 natural and constructed streams in Illinois are reported and displayed on a U.S. Geological Survey Web site. At a majority of the sites, discharge and stage were measured, and corresponding Manning's coefficients—the n-values—were determined at more than one river discharge. The n-values discussed in this report are computed from data representing the stream reach studied and, therefore, are reachwise values. Presentation of the resulting n-values takes a visual-comparison approach similar to the previously published Barnes report (1967), in which photographs of channel conditions, description of the site, and the resulting n-values are organized for each site. The Web site where the data can be accessed and are displayed is at URL http://il.water.usgs.gov/proj/nvalues/.

  11. Illinois Business Teacher Supply and Demand: A Conundrum Facing Program Maintenance and Teacher Education Policy in State Institutions of Higher Education in Illinois. A Report to the Illinois Board of Higher Education.

    ERIC Educational Resources Information Center

    Anderson-Yates, Marsha; And Others

    A study examined the supply and demand for business teachers for public schools in Illinois. Data from these sources were analyzed: employment projections by the Illinois Department of Employment Security, information about current and projected business education teacher positions throughout Illinois, demographic data about the state's current…

  12. Devonian shale gas resource assessment, Illinois basin

    SciTech Connect

    Cluff, R.M.; Cluff, S.G.; Murphy, C.M.

    1996-12-31

    In 1980 the National Petroleum Council published a resource appraisal for Devonian shales in the Appalachian, Michigan, and Illinois basins. Their Illinois basin estimate of 86 TCFG in-place has been widely cited but never verified nor revised. The NPC estimate was based on extremely limited canister off-gas data, used a highly simplified volumetric computation, and is not useful for targeting specific areas for gas exploration. In 1994 we collected, digitized, and normalized 187 representative gamma ray-bulk density logs through the New Albany across the entire basin. Formulas were derived from core analyses and methane adsorption isotherms to estimate total organic carbon (r{sup 2}=0.95) and gas content (r{sup 2}=0.79-0.91) from shale bulk density. Total gas in place was then calculated foot-by-foot through each well, assuming normal hydrostatic pressures and assuming the shale is gas saturated at reservoir conditions. The values thus determined are similar to peak gas contents determined by canister off-gassing of fresh cores but are substantially greater than average off-gas values. Greatest error in the methodology is at low reservoir pressures (or at shallow depths), however, the shale is generally thinner in these areas so the impact on the total resource estimate is small. The total New Albany gas in place was determined by integration to be 323 TCFG. Of this, 210 TCF (67%) is in the upper black Grassy Creek Shale, 72 TCF (23%) in the middle black and gray Selmier Shale, and 31 TCF (10%) in the basal black Blocher Shale. Water production concerns suggest that only the Grassy Creek Shale is likely to be commercially exploitable.

  13. Devonian shale gas resource assessment, Illinois basin

    SciTech Connect

    Cluff, R.M.; Cluff, S.G.; Murphy, C.M. )

    1996-01-01

    In 1980 the National Petroleum Council published a resource appraisal for Devonian shales in the Appalachian, Michigan, and Illinois basins. Their Illinois basin estimate of 86 TCFG in-place has been widely cited but never verified nor revised. The NPC estimate was based on extremely limited canister off-gas data, used a highly simplified volumetric computation, and is not useful for targeting specific areas for gas exploration. In 1994 we collected, digitized, and normalized 187 representative gamma ray-bulk density logs through the New Albany across the entire basin. Formulas were derived from core analyses and methane adsorption isotherms to estimate total organic carbon (r[sup 2]=0.95) and gas content (r[sup 2]=0.79-0.91) from shale bulk density. Total gas in place was then calculated foot-by-foot through each well, assuming normal hydrostatic pressures and assuming the shale is gas saturated at reservoir conditions. The values thus determined are similar to peak gas contents determined by canister off-gassing of fresh cores but are substantially greater than average off-gas values. Greatest error in the methodology is at low reservoir pressures (or at shallow depths), however, the shale is generally thinner in these areas so the impact on the total resource estimate is small. The total New Albany gas in place was determined by integration to be 323 TCFG. Of this, 210 TCF (67%) is in the upper black Grassy Creek Shale, 72 TCF (23%) in the middle black and gray Selmier Shale, and 31 TCF (10%) in the basal black Blocher Shale. Water production concerns suggest that only the Grassy Creek Shale is likely to be commercially exploitable.

  14. Production of a pellet fuel from Illinois coal fines. Technical report, March 1--May 31, 1995

    SciTech Connect

    Rapp, D.; Lytle, J.

    1995-12-31

    The primary goal of this research is to produce a pellet fuel from low-sulfur Illinois coal fines which could burn with emissions of less than 1.8 lbs SO{sub 2}/10{sup 6} Btu in stoker-fired boilers. The significance of 1.8 lbs SO{sub 2}/10{sup 6} Btu is that in the Chicago (9 counties) and St. Louis (2 counties) metropolitan areas, industrial users of coal currently must comply with this level of emissions. For this effort, we will be investigating the use of fines from two Illinois mines which currently mine relatively low-sulfur reserves and that discard their fines fraction (minus 100 mesh). The research will involve investigation of multiple unit operations including column flotation, filtration and pellet production. The end result of the effort will allow for an evaluation of the commercial viability of the approach. Previously it has been decided that corn starch would be used as binder and a roller-and-die mill would be used for pellet manufacture. A quality starch binder has been identified and tested. To potentially lower binder costs, a starch that costs about 50% of the high quality starch was tested. Results indicate that the lower cost starch will not lower binder cost because more is required to produce a comparable quality pellet. Also, a petroleum in water emulsion was evaluated as a potential binder. The compound seemed to have adhesive properties but was found to be a poor binder. Arrangements have been made to collect a waste slurry from the mine previously described.

  15. Sources and fate of nitrate in the Illinois River Basin, Illinois

    NASA Astrophysics Data System (ADS)

    Panno, Samuel V.; Kelly, Walton R.; Hackley, Keith C.; Hwang, Hue-Hwa; Martinsek, Adam T.

    2008-09-01

    SummaryWe conducted a two-year investigation into the sources and fate of nitrate ( NO3-) in the Illinois River from the Chicago area to the river's confluence with the Mississippi River. Samples from waterways in the Chicago area (Des Plaines River and the Sanitary and Ship Canal) had relatively high concentrations of nitrogen (N) species and NO3- isotopic compositions indicative of treated wastewater (TWW). Downstream of the Brandon Road Lock and Dam, NO3- in tributaries discharging to the Illinois River primarily comes from tiles draining row crops. Nitrate isotopic signatures from these tributaries as well as drain tiles were indicative of synthetic fertilizer and/or soil organic matter (SOM) at various stages of denitrification. Nitrate-N concentrations generally decreased in the Illinois River with distance from the Chicago area primarily due to dilution. The decrease in NO 3-N concentrations was especially conspicuous during the summer, when there is minimal discharge from drain tiles and NO 3-N concentrations in the tributaries were low. In August 2005, when conditions were very dry, NO 3-N concentrations decreased from 7.4 mg/L in the Chicago area to less than 1 mg/L near where the Illinois River discharges to the Mississippi River. The isotopic composition of NO3- in water samples from the Illinois River were a mixture of three end members: (1) fertilizer and/or SOM in drain tile water, typically showing the least amount of denitrification, (2) fertilizer and/or SOM in deeper ground water, showing the highest degree of denitrification, and (3) TWW. There was seasonal variability, depending on the volume of water flowing in the Illinois River. During high flow periods, river water samples plotted closest to those of tile drain samples; during low flow periods, a greater influence of TWW was observed in the isotopic composition. A subset of summer samples from the Chicago waterways had isotopic values plotting near and within the domain that characterizes

  16. CUBIT mesh generation environment. Volume 1: Users manual

    SciTech Connect

    Blacker, T.D.; Bohnhoff, W.J.; Edwards, T.L.

    1994-05-01

    The CUBIT mesh generation environment is a two- and three-dimensional finite element mesh generation tool which is being developed to pursue the goal of robust and unattended mesh generation--effectively automating the generation of quadrilateral and hexahedral elements. It is a solid-modeler based preprocessor that meshes volume and surface solid models for finite element analysis. A combination of techniques including paving, mapping, sweeping, and various other algorithms being developed are available for discretizing the geometry into a finite element mesh. CUBIT also features boundary layer meshing specifically designed for fluid flow problems. Boundary conditions can be applied to the mesh through the geometry and appropriate files for analysis generated. CUBIT is specifically designed to reduce the time required to create all-quadrilateral and all-hexahedral meshes. This manual is designed to serve as a reference and guide to creating finite element models in the CUBIT environment.

  17. On combining Laplacian and optimization-based mesh smoothing techniques

    SciTech Connect

    Freitag, L.A.

    1997-07-01

    Local mesh smoothing algorithms have been shown to be effective in repairing distorted elements in automatically generated meshes. The simplest such algorithm is Laplacian smoothing, which moves grid points to the geometric center of incident vertices. Unfortunately, this method operates heuristically and can create invalid meshes or elements of worse quality than those contained in the original mesh. In contrast, optimization-based methods are designed to maximize some measure of mesh quality and are very effective at eliminating extremal angles in the mesh. These improvements come at a higher computational cost, however. In this article the author proposes three smoothing techniques that combine a smart variant of Laplacian smoothing with an optimization-based approach. Several numerical experiments are performed that compare the mesh quality and computational cost for each of the methods in two and three dimensions. The author finds that the combined approaches are very cost effective and yield high-quality meshes.

  18. To mesh or not to mesh: a review of pelvic organ reconstructive surgery

    PubMed Central

    Dällenbach, Patrick

    2015-01-01

    Pelvic organ prolapse (POP) is a major health issue with a lifetime risk of undergoing at least one surgical intervention estimated at close to 10%. In the 1990s, the risk of reoperation after primary standard vaginal procedure was estimated to be as high as 30% to 50%. In order to reduce the risk of relapse, gynecological surgeons started to use mesh implants in pelvic organ reconstructive surgery with the emergence of new complications. Recent studies have nevertheless shown that the risk of POP recurrence requiring reoperation is lower than previously estimated, being closer to 10% rather than 30%. The development of mesh surgery – actively promoted by the marketing industry – was tremendous during the past decade, and preceded any studies supporting its benefit for our patients. Randomized trials comparing the use of mesh to native tissue repair in POP surgery have now shown better anatomical but similar functional outcomes, and meshes are associated with more complications, in particular for transvaginal mesh implants. POP is not a life-threatening condition, but a functional problem that impairs quality of life for women. The old adage “primum non nocere” is particularly appropriate when dealing with this condition which requires no treatment when asymptomatic. It is currently admitted that a certain degree of POP is physiological with aging when situated above the landmark of the hymen. Treatment should be individualized and the use of mesh needs to be selective and appropriate. Mesh implants are probably an important tool in pelvic reconstructive surgery, but the ideal implant has yet to be found. The indications for its use still require caution and discernment. This review explores the reasons behind the introduction of mesh augmentation in POP surgery, and aims to clarify the risks, benefits, and the recognized indications for its use. PMID:25848324

  19. Job Satisfaction of Financial Aid Administrators in Illinois.

    ERIC Educational Resources Information Center

    Clement, Robert J.; White, Gordon W.

    1983-01-01

    A survey of financial aid administrators in Illinois studied the possible relationships of institutional type, job title, and years of experience on administrators' personal security, socialization, self-esteem, autonomy, self-actualization, and feeling of being knowledgeable. (MSE)

  20. Perminalized Alethopteris from the Upper Pennsylvanian of Ohio and Illinois

    SciTech Connect

    Mickle, J.E.; Rothwell, G.W.

    1982-03-01

    Fern-like foliage referable to Alethopteris Steinberg has been discovered in coal balls of Late Pennsylvanian age from near Staubenville, Ohio, and Berryville, Illinois. Pinnule morphology is described from specimens preserved on coal-ball surfaces.

  1. Indirect impacts in Illinois from a renewable portfolio standard

    SciTech Connect

    Ohler, Adrienne M.; Radusewicz, Kristi

    2010-08-15

    Indirect impacts associated with Illinois' RPS include a change in the laws concerning the planning and zoning for wind development, a market for renewable energy credits, and awareness of problems with the transmission grid. (author)

  2. 8. Historic American Buildings Survey Illinois State Historical Library, Photographer ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    8. Historic American Buildings Survey Illinois State Historical Library, Photographer SECOND FLOOR HALL LOOKING SOUTH INTO STUDY - David Davis Mansion, Monroe & Davis Streets, Bloomington, McLean County, IL

  3. Illinois Occupational Skill Standards: Information Technology Operate Cluster.

    ERIC Educational Resources Information Center

    Illinois Occupational Skill Standards and Credentialing Council, Carbondale.

    This document contains Illinois Occupational Skill Standards for occupations in the Information Technology Operate Cluster (help desk support, computer maintenance and technical support technician, systems operator, application and computer support specialist, systems administrator, network administrator, and database administrator). The skill…

  4. 76 FR 57022 - Coastal Zone Management Program: Illinois

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-09-15

    ... National Oceanic And Atmospheric Administration Coastal Zone Management Program: Illinois AGENCY: Office of Ocean and Coastal Resource Management (OCRM), National Oceanic and Atmospheric Administration (NOAA... Impact Statement (DEIS) prepared by NOAA's Office of Ocean and Coastal Resource Management. The...

  5. 78 FR 32414 - Illinois; Major Disaster and Related Determinations

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-05-30

    ... affected by this major disaster: Cook, DeKalb, DuPage, Fulton, Grundy, Kane, Kendall, Lake, LaSalle, McHenry, and Will Counties for Individual Assistance. All counties within the State of Illinois...

  6. 76 FR 52565 - Drawbridge Operation Regulation; Illinois Waterway, Joliet, IL

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-08-23

    ... the bridge to be maintained in the closed-to- navigation position for ten hours. DATES: This deviation..., Illinois to remain in the closed-to-navigation position for ten hours while repair work is done on...

  7. Sidney W. Bijou: The Illinois Years, 1965–1975

    PubMed Central

    Morris, Edward K

    2008-01-01

    Sidney W. Bijou is among the founders of behavior analysis, but the record of his contributions is incomplete. It has not systematically described his contributions beyond his tenure at the University of Washington (1948–1965). The purpose of this paper is to describe his contributions over the course of the next decade—his years at the University of Illinois (1965–1975). I begin by reviewing his education and training, contributions at Washington, and why he left and moved to Illinois. Then, I describe his Illinois years: his appointments, colleagues, and service; the Child Behavior Laboratory; grant funding and publications; further service, awards, and recognition; and influence on his colleagues, students, classroom teachers and research supervisors, and visiting scholars. Bijou is modest about his contributions at Illinois, but he advanced the field in many ways over the course of the decade, especially the careers of his colleagues and students. PMID:22478510

  8. Practice Characteristics of Recent Illinois College of Optometry Graduates.

    ERIC Educational Resources Information Center

    Gailmard, Neil B.; And Others

    1984-01-01

    Demographic information regarding mode of practice, income and satisfaction level is provided for 1978-82 graduates of the Illinois College of Optometry. A practice management questionnaire is appended. (Author/MLW)

  9. On Reducing Delay in Mesh-Based P2P Streaming: A Mesh-Push Approach

    NASA Astrophysics Data System (ADS)

    Liu, Zheng; Xue, Kaiping; Hong, Peilin

    The peer-assisted streaming paradigm has been widely employed to distribute live video data on the internet recently. In general, the mesh-based pull approach is more robust and efficient than the tree-based push approach. However, pull protocol brings about longer streaming delay, which is caused by the handshaking process of advertising buffer map message, sending request message and scheduling of the data block. In this paper, we propose a new approach, mesh-push, to address this issue. Different from the traditional pull approach, mesh-push implements block scheduling algorithm at sender side, where the block transmission is initiated by the sender rather than by the receiver. We first formulate the optimal upload bandwidth utilization problem, then present the mesh-push approach, in which a token protocol is designed to avoid block redundancy; a min-cost flow model is employed to derive the optimal scheduling for the push peer; and a push peer selection algorithm is introduced to reduce control overhead. Finally, we evaluate mesh-push through simulation, the results of which show mesh-push outperforms the pull scheduling in streaming delay, and achieves comparable delivery ratio at the same time.

  10. Mesh quality control for multiply-refined tetrahedral grids

    NASA Technical Reports Server (NTRS)

    Biswas, Rupak; Strawn, Roger

    1994-01-01

    A new algorithm for controlling the quality of multiply-refined tetrahedral meshes is presented in this paper. The basic dynamic mesh adaption procedure allows localized grid refinement and coarsening to efficiently capture aerodynamic flow features in computational fluid dynamics problems; however, repeated application of the procedure may significantly deteriorate the quality of the mesh. Results presented show the effectiveness of this mesh quality algorithm and its potential in the area of helicopter aerodynamics and acoustics.

  11. Dynamic mesh adaption for triangular and tetrahedral grids

    NASA Technical Reports Server (NTRS)

    Biswas, Rupak; Strawn, Roger

    1993-01-01

    The following topics are discussed: requirements for dynamic mesh adaption; linked-list data structure; edge-based data structure; adaptive-grid data structure; three types of element subdivision; mesh refinement; mesh coarsening; additional constraints for coarsening; anisotropic error indicator for edges; unstructured-grid Euler solver; inviscid 3-D wing; and mesh quality for solution-adaptive grids. The discussion is presented in viewgraph form.

  12. Pelvic Organ Prolapse---Vaginal and Laparoscopic Mesh: The Evidence.

    PubMed

    Richter, Lee A; Sokol, Andrew I

    2016-03-01

    This report summarizes the current literature on abdominal, laparoscopic, and transvaginal mesh for the treatment of pelvic organ prolapse. This article reviews objective and subjective cure rates as well as complications associated with synthetic mesh use for pelvic organ prolapse repair. The focus is on the latest literature that provides evidence for when synthetic mesh use is most appropriate. The use of mesh for the repair of urinary incontinence is not reviewed in this article. PMID:26880510

  13. Simple optimization method for EMI mesh pattern design

    NASA Astrophysics Data System (ADS)

    Alpman, Mehmet Erhan; Senger, Tolga

    2014-05-01

    Metallic mesh coatings are used on visible and infrared windows and domes widely to provide shielding from EMI (Electromagnetic Interference). In this paper, different EMI mesh geometries are compared with each other regarding various performance parameters. But to decide the best fitting EMI mesh geometry to particular optic system is a little bit complicated issue. Therefore, we try to find a simple optimization methodology to decide best EMI mesh geometry design that fits our particular high performance ISR (Intelligence, Surveillance and Reconnaissance) systems.

  14. Biodegradation of air-oxidized Illinois No. 6 coal

    SciTech Connect

    Linehan, J.C.; Fredrickson, J.K.; Wilson, B.W.; Bean, R.M.; Stewart, D.L.; Thomas, B.L.; Campbell, J.A.; Franz, J.A.

    1988-09-01

    We have found that Illinois No. 6 coal, after an air-oxidation pretreatment, can be substantially biodegraded by Penicillium sp. to a product largely soluble in dilute base. It is the purpose of this paper to describe the chemical nature of the biotreated Illinois No. 6 coal and to compare it with the corresponding material from leonardite biosolubilization. 12 refs., 7 figs., 3 tabs.

  15. Trichinellosis caused by consumption of wild boar meat - Illinois, 2013.

    PubMed

    Greene, Yoran Grant; Padovani, Thomas; Rudroff, Jo Ann; Hall, Rebecca; Austin, Connie; Vernon, Michael

    2014-05-23

    On March 6, 2013, the Cook County Department of Public Health (Chicago, Illinois) contacted the Illinois Department of Public Health regarding a diagnosis of trichinellosis in a patient who had consumed wild boar and deer meat obtained by hunting at a Missouri ranch January 16-18. Trichinellosis is a parasitic infection caused by consumption of undercooked infected meat, most commonly from carnivorous or omnivorous animals. PMID:24848218

  16. Cubit Mesh Generation Toolkit V11.1

    2009-03-25

    CUBIT prepares models to be used in computer-based simulation of real-world events. CUBIT is a full-featured software toolkit for robust generation of two- and three-dimensional finite element meshes (grids) and geometry preparation. Its main goal is to reduce the time to generate meshes, particularly large hex meshes of complicated, interlocking assemblies.

  17. Does lining polypropylene with polyglactin mesh reduce intraperitoneal adhesions?

    PubMed

    Dasika, U K; Widmann, W D

    1998-09-01

    A method that appears to reduce the rate of adhesion formation between intraperitoneal viscera and prosthetic mesh is the placement of absorbable mesh between nonabsorbable mesh and intraperitoneal viscera. In this study, polyglactin mesh was compared with nonabsorbable polypropylene mesh (Marlex). Forty-seven Sprague-Dawley rats were divided into four groups: 1) control, 2) polyglactin (Vicryl), 3) polypropylene mesh, and 4) polyglactin-lined polypropylene mesh. All rats that underwent mesh placement had midline laparotomy with anastamosis of mesh to fascial borders. Controls underwent midline laparotomy and closure only. Groups were then studied at 1, 2, and 3 months, respectively, to determine the degree of adhesion formation. Gross inspection was performed by a blinded researcher with numerical rank given based on the number of adhesions observed: 0, none; 1, mild; 2, moderate; and 3, severe. The data showed that rats in group 3 (polypropylene only) had significant adhesions at 3 months, with average numerical score of 2.75. Polyglactin and polyglactin/polypropylene groups had similar scores of 1.5 each. Control groups predictably showed little adhesion formation, with average score of 0.25. Based on these data, it is observed that lining polypropylene mesh with absorbable polyglactin mesh can reduce adhesion formation to nonabsorbable mesh. The difference in degree of adhesions is most notable at 3 months. This technique may be an important adjunct to reduce the clinical sequelae of intraperitoneal adhesions. PMID:9731806

  18. Kull ALE: II. Grid Motion on Unstructured Arbitrary Polyhedral Meshes

    SciTech Connect

    Anninos, P

    2002-02-11

    Several classes of mesh motion algorithms are presented for the remap phase of unstructured mesh ALE codes. The methods range from local shape optimization procedures to more complex variational minimization methods applied to arbitrary unstructured polyhedral meshes necessary for the Kull code.

  19. Human Endometrial Mesenchymal Stem Cells Modulate the Tissue Response and Mechanical Behavior of Polyamide Mesh Implants for Pelvic Organ Prolapse Repair

    PubMed Central

    Ulrich, Daniela; Edwards, Sharon Lee; Su, Kai; Tan, Ker Sin; White, Jacinta F.; Ramshaw, John A.M.; Lo, Camden; Rosamilia, Anna; Werkmeister, Jerome A.

    2014-01-01

    Background: Pelvic organ prolapse (POP) is defined as the descent of one or more of the pelvic structures into the vagina and includes uterine, vaginal vault, and anterior or posterior vaginal wall prolapse. The treatment of POP may include implantation of a synthetic mesh. However, the long-term benefit of mesh surgery is controversial due to complications such as mesh exposure or pain. The aim of this study was to use a tissue engineering (TE) approach to assess the in vivo biological and biomechanical behavior of a new gelatin/polyamide mesh, seeded with a novel source of mesenchymal stem cells in a subcutaneous rat model of wound repair. Methods: W5C5-enriched human endometrial mesenchymal stem cells (eMSC) were seeded onto meshes (gelatin-coated polyamide knit) at 100,000 cells/cm2. Meshes, with or without cells were subcutaneously implanted dorsally in immunocompromised rats for 7, 30, 60, and 90 days. Flow cytometry was used to detect DiO labeled cells after explantation. Immunohistochemical assessment of foreign body reaction and tissue integration were conducted. Total collagen and the levels of collagens type III and type I were determined. Uniaxial tensiometry was performed on explanted meshes, originally seeded with and without cells, at days 7 and 90. Results: Implanted meshes were well tolerated, with labeled cells detected on the mesh up to 14 days postimplantation. Meshes with cells promoted significantly more neovascularization at 7 days (p<0.05) and attracted fewer macrophages at 90 days (p<0.05). Similarly, leukocyte infiltration was significantly lower in the cell-seeded meshes at 90 days (p<0.05). Meshes with cells were generally less stiff than those without cells, after 7 and 90 days implantation. Conclusion: The TE approach used in this study significantly reduced the number of inflammatory cells around the implanted mesh and promoted neovascularization. Seeding with eMSC exerts an anti-inflammatory effect and promotes wound repair with new

  20. Configuring the mesh size, side taper and wing depth of penaeid trawls to reduce environmental impacts.

    PubMed

    Broadhurst, Matt K; Sterling, David J; Millar, Russell B

    2014-01-01

    The effects of reducing mesh size while concomitantly varying the side taper and wing depth of a generic penaeid-trawl body were investigated to improve engineering performance and minimize bycatch. Five trawl bodies (with the same codends) were tested across various environmental (e.g. depth and current) and biological (e.g. species and sizes) conditions. The first trawl body comprised 41-mm mesh and represented conventional designs (termed the '41 long deep-wing'), while the remaining trawl bodies were made from 32-mm mesh and differed only in their side tapers, and therefore length (i.e. 1N3B or 'long' and ∼28o to the tow direction vs 1N5B or 'short' and ∼35o) and wing depths ('deep'-97 T vs 'shallow'-60 T). There were incremental drag reductions (and therefore fuel savings--by up to 18 and 12% per h and ha trawled) associated with reducing twine area via either modification, and subsequently minimizing otter-board area in attempts to standardize spread. Side taper and wing depth had interactive and varied effects on species selectivity, but compared to the conventional 41 long deep-wing trawl, the 32 short shallow-wing trawl (i.e. the least twine area) reduced the total bycatch by 57% (attributed to more fish swimming forward and escaping). In most cases, all small-meshed trawls also caught more smaller school prawns Metapenaeus macleayi but to decrease this effect it should be possible to increase mesh size slightly, while still maintaining the above engineering benefits and species selectivity. The results support precisely optimizing mesh size as a precursor to any other anterior penaeid-trawl modifications designed to improve environmental performance. PMID:24911786