Science.gov

Sample records for aggregate college operating

  1. Aggregation operations for multiaspect fuzzy soft sets

    NASA Astrophysics Data System (ADS)

    Sulaiman, Nor Hashimah; Mohamad, Daud

    2015-10-01

    Multiaspect fuzzy soft set (MAFSS) is one of the generalized forms of fuzzy soft sets. In this paper, we introduce two types of aggregation operations for MAFSSs, namely the weighted arithmetic mean (WAM)-based MAFSS aggregation, and the ordered weighted aggregation (OWA)-based MAFSS aggregation. The applicability of the two MAFSS-aggregation operations is illustrated with numerical examples in group decision making.

  2. Using new aggregation operators in rule-based intelligent control

    NASA Technical Reports Server (NTRS)

    Berenji, Hamid R.; Chen, Yung-Yaw; Yager, Ronald R.

    1990-01-01

    A new aggregation operator is applied in the design of an approximate reasoning-based controller. The ordered weighted averaging (OWA) operator has the property of lying between the And function and the Or function used in previous fuzzy set reasoning systems. It is shown here that, by applying OWA operators, more generalized types of control rules, which may include linguistic quantifiers such as Many and Most, can be developed. The new aggregation operators, as tested in a cart-pole balancing control problem, illustrate improved performance when compared with existing fuzzy control aggregation schemes.

  3. Some series of intuitionistic fuzzy interactive averaging aggregation operators.

    PubMed

    Garg, Harish

    2016-01-01

    In this paper, some series of new intuitionistic fuzzy averaging aggregation operators has been presented under the intuitionistic fuzzy sets environment. For this, some shortcoming of the existing operators are firstly highlighted and then new operational law, by considering the hesitation degree between the membership functions, has been proposed to overcome these. Based on these new operation laws, some new averaging aggregation operators namely, intuitionistic fuzzy Hamacher interactive weighted averaging, ordered weighted averaging and hybrid weighted averaging operators, labeled as IFHIWA, IFHIOWA and IFHIHWA respectively has been proposed. Furthermore, some desirable properties such as idempotency, boundedness, homogeneity etc. are studied. Finally, a multi-criteria decision making method has been presented based on proposed operators for selecting the best alternative. A comparative concelebration between the proposed operators and the existing operators are investigated in detail. PMID:27441128

  4. Microcomputer applications for concurrent aggregate mine operation and reclamation planning

    SciTech Connect

    Culp, B.K.

    1990-02-01

    As ever increasing need exists for the planning of aggregate mine operations and reclamation. The purpose of this thesis is to investigate microcomputer applications to assist in the development of a concurrent aggregate mine operation and reclamation plan. The thesis is divided into sections that encompassed three aspects. The first, Section 1 -- concurrent Aggregate Mine Operation and Reclamation Planning, examines the possibility of organizing the operation and reclamation of aggregate mining into a single plan or set of plans. The second section of the thesis, Section 2 -- Microcomputer Applications, describes the use of microcomputers within the mining industry and the landscape architecture profession. This section contains a review of the current types of programs and how they are used. The programs that were used for the case study and their applications and characteristics are also explored. The third and final section of the thesis, Section 3 -- Alden Quarry Case Study, applies the concepts of the first two sections to a practical situation. 35 refs., 49 figs., 7 tabs.

  5. 36th Annual Maintenance & Operations Cost Study: Colleges

    ERIC Educational Resources Information Center

    Agron, Joe

    2007-01-01

    Colleges are focusing increased effort--and money--to improve the physical condition of existing facilities and address a huge backlog of deferred maintenance. According to "American School & University's" 36th annual Maintenance and Operations (M&O) Cost Study, the median college spends 16.4% of total college budget on M&O, up from 11% the year…

  6. 38th Annual Maintenance & Operations Cost Study for Colleges

    ERIC Educational Resources Information Center

    Agron, Joe

    2009-01-01

    The nation's colleges are feeling the pinch of the economic downturn, and maintenance and operations (M&O) budgets especially are under pressure. This article presents data from the 38th annual Maintenance & Operations Cost Study for colleges that can help one in benchmarking expenditures at one's institution. Data provided only targets two-year…

  7. A new multi-period linguistic aggregation operator and its application to financial product selection

    NASA Astrophysics Data System (ADS)

    Liu, Xiaoli; Yang, Wei

    2013-03-01

    In this paper, we propose a new aggregation operator, dynamic 2-tuple linguistic weighted averaging (DTWA) operator, to aggregate linguistic information given in multiple periods. The properties of the new operator are studied and a new multiple attribute decision making method based on the new operator is proposed. Finally, financial product selection problem is provided to illustrate the the proposed method in financial decision making problem.

  8. 26 CFR 1.614-2 - Election to aggregate separate operating mineral interests under section 614(b) prior to its...

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... 26 Internal Revenue 7 2010-04-01 2010-04-01 true Election to aggregate separate operating mineral...) INCOME TAXES (CONTINUED) Natural Resources § 1.614-2 Election to aggregate separate operating mineral...(a) of the Revenue Act of 1964, to aggregate separate operating mineral interests, and,...

  9. Recent College Graduates Study, 1987 (RCGS-1987). Combined File of Survey and Aggregate Transcript Data [machine-readable data file].

    ERIC Educational Resources Information Center

    National Center for Education Statistics (ED), Washington, DC.

    The 1987 Recent College Graduates Study (RCGS) machine-readable data file, RECENT.GRADS.COMBINED.A8586, is the third of three data files produced from the study and contains information about 1985-86 bachelor's degree graduates for whom both questionnaire and transcript data were collected. The combined survey and aggregate transcript data file…

  10. Hesitant Fuzzy Linguistic Multicriteria Decision-Making Method Based on Generalized Prioritized Aggregation Operator

    PubMed Central

    Wu, Jia-ting; Wang, Jian-qiang; Wang, Jing; Zhang, Hong-yu; Chen, Xiao-hong

    2014-01-01

    Based on linguistic term sets and hesitant fuzzy sets, the concept of hesitant fuzzy linguistic sets was introduced. The focus of this paper is the multicriteria decision-making (MCDM) problems in which the criteria are in different priority levels and the criteria values take the form of hesitant fuzzy linguistic numbers (HFLNs). A new approach to solving these problems is proposed, which is based on the generalized prioritized aggregation operator of HFLNs. Firstly, the new operations and comparison method for HFLNs are provided and some linguistic scale functions are applied. Subsequently, two prioritized aggregation operators and a generalized prioritized aggregation operator of HFLNs are developed and applied to MCDM problems. Finally, an illustrative example is given to illustrate the effectiveness and feasibility of the proposed method, which are then compared to the existing approach. PMID:25258729

  11. FINANCIAL ANALYSIS OF CURRENT OPERATIONS OF COLLEGES AND UNIVERSITIES.

    ERIC Educational Resources Information Center

    SWANSON, JOHN E.; AND OTHERS

    TECHNIQUES FOR DEVELOPING FINANCIAL AND RELATED COST-EFFECTIVENESS DATA FOR PUBLIC AND PRIVATELY SUPPORTED AMERICAN COLLEGES AND UNIVERSITIES WERE STUDIED TO FORMULATE PRINCIPLES, PROCEDURES, AND STANDARDS FOR THE ACCUMULATION AND ANALYSES OF CURRENT OPERATING COSTS. AFTER SEPARATE ANALYSES OF INSTITUTIONAL PROCEDURES AND REPORTS, ANALYTIC UNITS…

  12. Towards an operational implementation of particle aggregation in ash dispersion models (Invited)

    NASA Astrophysics Data System (ADS)

    Mastin, L. G.; Van Eaton, A. R.; Durant, A. J.; Schwaiger, H. F.; Denlinger, R. P.

    2013-12-01

    During volcanic unrest, ash transport models are used by volcano observatories and civil protection authorities to forecast areas at risk from tephra deposition. These models can effectively forecast areas affected due to their reliance on modern numerical wind fields. But they cannot yet accurately forecast the mass distribution in deposits, due largely to one process--particle aggregation--that is not considered in most models. Aggregation rates vary with particle concentration, size distribution, and the amount and phases of water present. Relationships between these variables are not yet well quantified. Although modeling studies have reproduced the observed distribution of tephra deposits from several key eruptions, most have done so only a posteriori, through ad-hoc adjustments in grain-size distribution or settling velocity. Here, we report early attempts to incorporate aggregation into the transport and deposition model Ash3d in a simplified form that can be implemented operationally. This project includes three steps: (1) characterizing aggregate size and abundance starting from deposit measurements at Mount St. Helens, Redoubt, and Spurr volcanoes; (2) developing a scheme to characterize aggregation using 2 or 3 parameters whose values can be ascertained for atmospheric and source conditions; and (3) incorporating the scheme into the model so that parameter values can be assigned prior to each simulation. For example, the May 18, 1980 Mount St. Helens deposit can be simulated using two aggregation parameters A (=2.8) and B (=1.9), both in phi units, where A represents the largest size class incorporated into aggregates and B represents the dominant size of aggregates (with assumed density 600 kg m-3). The mass fraction Fφ of each size class φ incorporated into aggregates is assumed to follow Fφ=1-exp(-max(0,φ-A)). We will report the success of this scheme to model several other well-characterized deposits.

  13. Community College Finance: A Cost Analysis of Community College Expenditures Related to Maintenance and Operations

    ERIC Educational Resources Information Center

    Collins, Michael T.

    2011-01-01

    The purpose of this study is to develop a costing model for maintenance and operations expenditures among 16 single-campus California community college districts and assess the impact of a variety of variables including size of student enrollment, physical plant age, acreage, gross square footage, and general obligation facility bonds on district…

  14. 27 CFR 19.34 - Experimental or research operations by scientific institutions and colleges of learning.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ... operations by scientific institutions and colleges of learning. 19.34 Section 19.34 Alcohol, Tobacco Products... Experimental Operations § 19.34 Experimental or research operations by scientific institutions and colleges of learning. (a) General. The appropriate TTB officer may authorize any scientific university, college...

  15. Evaluating student's academic achievement by a non-additive aggregation operator

    NASA Astrophysics Data System (ADS)

    Abdullah, Siti Rohana Goh; Kasim, Maznah Mat; Ramli, Mohammad Fadzli; Sakib, Elyana

    2014-07-01

    In the context of multi-criteria decision making (MCDM), the average method used in Integrated Students Information System (ISIS) can be classified as an additive measure where the students' academic achievement are aggregated based on the assumption that there is no interaction among the evaluation criteria or the criteria are independent. This method is not suitable to be used if the schools look for equilibrium in their students' achievement. Thus, the non-additive aggregation operator is chosen to analyze students' academic achievements by further taking into accounts the interactions between the subjects. The measures of interaction were represented as λ-fuzzy measures. The effectiveness and success of this non-additive measures can be recognized by comparing the results of the new ranking which was obtained by nonadditive aggregation operator with the current approach of ranking that were based on the global scores using average score method. Throughout this study, it could be postulated that employing the non-additive aggregation operators to obtain an overall evaluation is more suitable because this method able to deal with interactions among subjects whereas the average method only assumes that there is no interaction between subjects or the subjects must be independent.

  16. Outcomes of a Christian College Education: A Comparison of CCCU Students' Gains to the National Aggregate

    ERIC Educational Resources Information Center

    Schreiner, Laurie A.; Kim, Young K.

    2011-01-01

    This study examined the patterns of college experiences and outcomes among 3,501 students attending colleges or universities that belong to the Council for Christian Colleges & Universities (CCCU). As part of the CCCU-sponsored Comprehensive Assessment Project (CAP), 25 member institutions collected data from their first-year students using the…

  17. Historically Black Colleges and Universities: Improving Operations through an Enterprise Resource Planning System

    ERIC Educational Resources Information Center

    Hardee, Teresa

    2012-01-01

    There are a variety of challenges facing colleges and universities today. With shrinking public funding, many colleges and universities must rethink their operations to ensure that they are operating efficiently. Historically Black Colleges and Universities (HBCUs) have an even more daunting task in a downturned economy because they are often…

  18. Administration and Operation of the College Union. Third Edition. College Unions at Work Monograph Series, Number 1.

    ERIC Educational Resources Information Center

    Miller, Marlis R.; Galey, Denise

    Administrative and operational patterns of college student unions were studied in 1986. Questionnaires were returned by 504 out of 928 members of the Association of College Unions-International in the United States, Canada, Australia, New Zealand, and Japan. A total of 88 statistical tables and narrative summaries of findings are provided. The…

  19. FY 1982 Operating Budget Request for the Illinois Public Community College System.

    ERIC Educational Resources Information Center

    Capriola, Virginia L.; Lach, Ivan J.

    This four-part report presents a graphic and textual summary of the operating budget requested by the Illinois Community College Board (ICCB) for fiscal year (FY) 1982. Part I details: (1) allocations to the individual colleges, the State Community College of East St. Louis (SCCESL), the ICCB Office, the State University Retirement System, and the…

  20. Washington State Community College Operating Budget, 1985-87. Management Summary.

    ERIC Educational Resources Information Center

    Washington State Board for Community Coll. Education, Olympia.

    A summary is presented of the 1985-87 community college operating budget request for the Washington State Community colleges, along with a description of the policy considerations inherent in the request and the anticipated effect of the request on community college programs. The philosophy and objectives underpinning the budget request are…

  1. The use of Merging and Aggregation Operators for MRDB Data Feeding

    NASA Astrophysics Data System (ADS)

    Kozioł, Krystian; Lupa, Michał

    2013-12-01

    This paper presents the application of two generalization operators - merging and displacement - in the process of automatic data feeding in a multiresolution data base of topographic objects from large-scale data-bases (1 : 500-1 : 5000). An ordered collection of objects makes a layer of development that in the process of generalization is subjected to the processes of merging and displacement in order to maintain recognizability in the reduced scale of the map. The solution to the above problem is the algorithms described in the work; these algorithms use the standard recognition of drawings (Chrobak 2010), independent of the user. A digital cartographic generalization process is a set of consecutive operators where merging and aggregation play a key role. The proper operation has a significant impact on the qualitative assessment of data generalization

  2. Water level measurements for modeling hydraulic properties in the 300-FF-5 and 100 Aggregate Area Operable units

    SciTech Connect

    Campbell, M.D.; McMahon, W.J.; Simpson, K.R.

    1993-04-01

    Pressure transducers connected to dataloggers were used to measure ground water and Columbia River water elevations simultaneously and hourly at 35 locations in the 300-FF-5 Operable Unit and 16 locations in the 100 Aggregate Area Operable Unit on the Hanford Site. Water temperatures were also measured at 12 of these locations. This report details the findings of these studies.

  3. Child Care Center Operations and Facilities of Selected League for Innovation Community Colleges.

    ERIC Educational Resources Information Center

    McElhenny, Sara

    The major purpose of this study was to describe community college child care centers in terms of selected operational and physical features. It was expected that findings would provide answers to the following questions: What child care provisions exist on selected community college campuses? How do those child care centers serve their respective…

  4. Cerritos Community College: Improvements Needed in Aspects of Operating the District and Its Auxiliary Organization.

    ERIC Educational Resources Information Center

    California State Office of the Auditor General, Sacramento.

    This audit report discusses the operation of the Enterprise Fund by Cerritos Community College District in California. In addition, the Cerritos College Foundation's conflict of interest policies, its relationship with the district, and its award of contracts for services was reviewed. It was found that the district needed improvement in its…

  5. Continuous Hesitant Fuzzy Aggregation Operators and Their Application to Decision Making under Interval-Valued Hesitant Fuzzy Setting

    PubMed Central

    Wang, Tie-Dan; Gao, Chang-Yuan; Wang, Hua

    2014-01-01

    Interval-valued hesitant fuzzy set (IVHFS), which is the further generalization of hesitant fuzzy set, can overcome the barrier that the precise membership degrees are sometimes hard to be specified and permit the membership degrees of an element to a set to have a few different interval values. To efficiently and effectively aggregate the interval-valued hesitant fuzzy information, in this paper, we investigate the continuous hesitant fuzzy aggregation operators with the aid of continuous OWA operator; the C-HFOWA operator and C-HFOWG operator are presented and their essential properties are studied in detail. Then, we extend the C-HFOW operators to aggregate multiple interval-valued hesitant fuzzy elements and then develop the weighted C-HFOW (WC-HFOWA and WC-HFOWG) operators, the ordered weighted C-HFOW (OWC-HFOWA and OWC-HFOWG) operators, and the synergetic weighted C-HFOWA (SWC-HFOWA and SWC-HFOWG) operators; some properties are also discussed to support them. Furthermore, a SWC-HFOW operators-based approach for multicriteria decision making problem is developed. Finally, a practical example involving the evaluation of service quality of high-tech enterprises is carried out and some comparative analyses are performed to demonstrate the applicability and effectiveness of the developed approaches. PMID:24987747

  6. 26 CFR 1.614-2 - Election to aggregate separate operating mineral interests under section 614(b) prior to its...

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ... 26 Internal Revenue 7 2011-04-01 2009-04-01 true Election to aggregate separate operating mineral interests under section 614(b) prior to its amendment by Revenue Act of 1964. 1.614-2 Section 1.614-2 Internal Revenue INTERNAL REVENUE SERVICE, DEPARTMENT OF THE TREASURY (CONTINUED) INCOME TAX (CONTINUED) INCOME TAXES (CONTINUED) Natural...

  7. Colleges Get Greener in Operations, but Teaching Sustainability Declines

    ERIC Educational Resources Information Center

    Carlson, Scott

    2008-01-01

    More colleges are making sustainability programs a high priority, putting more resources into energy-conservation efforts, and setting goals to reduce carbon emissions, according to survey results released by the National Wildlife Federation. Given the popularity of all things green, that is not surprising. The surprising part of the federation's…

  8. Faculty Senates in California Community Colleges: Five Years of Operation.

    ERIC Educational Resources Information Center

    Porter, Adalbert D.

    Reviewed in this report are the steps that led to the formation of faculty senates in California. Through interviews, the functions of such senates and their current status were determined and guidelines were formulated that would lead toward implementation of the concept of shared authority in community college governance. Interviewing…

  9. Aims College Operation Bridge Project. Phase 1, Preliminary Evaluation Report.

    ERIC Educational Resources Information Center

    National Spanish Speaking Management Association, Washington, DC.

    Recognizing the adverse effects of poverty on Mexican Americans, and determined to help narrow the barriers caused by a low socioeconomic status, Aims college, a locally funded institution in Weld County, Colorado, conceptualized and implemented a special needs program designed to provide vocational and occupational training for disadvantaged…

  10. Continuity of operations planning in college athletic programs: The case for incorporating Federal Emergency Management Guidelines.

    PubMed

    Hall, Stacey A; Allen, Brandon L; Phillips, Dennis

    2016-01-01

    College athletic departments have a responsibility to provide a safe environment for student-athletes; however, most colleges do not have a crisis management plan that includes procedures for displaced student-athletes or alternate facilities to perform athletic events. Continuity of operations planning ensures athletic programs are equipped to maintain essential functions during, or shortly after, a disruption of operations due to possible hazards. Previous studies have identified a lack of emergency preparedness and continuity planning in college athletic departments. The purpose of this article is to illustrate in detail one approach to disaster planning for college athletic departments, namely the Federal Emergency Management Agency (FEMA) continuity of operations framework. By adhering to FEMA guidelines and promoting a best practices model, athletic programs can effectively plan to address potential hazards, as well as protect the organization's brand, image, and financial sustainability after a crisis event. PMID:26963231

  11. Weighted aggregation

    NASA Technical Reports Server (NTRS)

    Feiveson, A. H. (Principal Investigator)

    1979-01-01

    The use of a weighted aggregation technique to improve the precision of the overall LACIE estimate is considered. The manner in which a weighted aggregation technique is implemented given a set of weights is described. The problem of variance estimation is discussed and the question of how to obtain the weights in an operational environment is addressed.

  12. Three dimensional culture of pineal cell aggregates: a model of cell-cell co-operation.

    PubMed

    Khan, N A; Shacoori, V; Havouis, R; Querné, D; Moulinoux, J P; Rault, B

    1995-05-01

    Three dimensional (3-D) cultures of pineal cell aggregates were obtained by constant gyratory shaking the heterogenous cell populations, obtained from the rat pineals, in the DMEM (Dulbecco's modified Eagle's medium). Within 4 days, the pineal cells became organized into a tissue like configuration appearing as a compact ball, evidenced by the scanning electron microscopy. The 3-D aggregates seemed to be mainly composed of pinealocytes (round-oval cells), glial (elongated cells) and other unknown cells. The heterogenous cells were separated by intercellular spaces. The ultrastructural characteristics revealed by transmission electron microscopy exhibited the presence of granular lysosomes, typical of pinealocytes actively involved in the secretion. These pineal cell aggregates secreted melatonin and other indole amines i.e. 5-methoxytryptamine (5-MT), indole acetic acid (IAA), 5-methoxy-3-indole acetic acid (5-MIAA), tryptophol (TOL) and 5-methoxytryptophol (5-MTL) in the culture medium, indicating the functional aspect of pinealocytes. The 3-D aggregates cultures had advantages over the pineal monolayer cultures as, after 4 days of culture, the amounts of indole amines secreted by 3-D aggregates were higher than those secreted by monolayer cultures. Besides, the 3-D aggregates remained functional till 24 days in the gyratory culture conditions. In the continuous perifusion system, the 3-D aggregates secreted melatonin while challanged with isoproterenol. This 3-D model of pineal cell aggregates might be useful, in future, to perform other kinetic studies of the release of indole amines in perifusion experiments as this system allows the maintenance of pineal cells for a long period of time. PMID:7550281

  13. Helicopter Parents of Community College Students: How Community College Professionals Operationally Define and Address This Phenomenon

    ERIC Educational Resources Information Center

    Hightower, Helen C.

    2014-01-01

    This study examined whether the phenomenon of "parental over-involvement" occurred in the Virginia Community College System. Concern has been expressed in the popular and academic literature in recent years over the increased level of parental involvement at four year institutions whose student bodies consist almost exclusively of…

  14. Automated Technical Operations: Unified Ordering/Cataloging Systems at the Libraries of the Claremont Colleges.

    ERIC Educational Resources Information Center

    Teare, Robert F., Ed.

    Since 1966 the libraries of the Associated Claremont Colleges have developed an automated central acquisition and cataloging system. This system differs from most other technical service organizations and operations in three ways: (1) ordering and cataloging operations are integrated and blended to avoid duplicate and uncoordinated performance,…

  15. 27 CFR 19.34 - Experimental or research operations by scientific institutions and colleges of learning.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ... Experimental Operations § 19.34 Experimental or research operations by scientific institutions and colleges of... learning, or institution of scientific research to produce, receive, blend, treat, test, and store spirits... 27 Alcohol, Tobacco Products and Firearms 1 2014-04-01 2014-04-01 false Experimental or...

  16. 27 CFR 19.34 - Experimental or research operations by scientific institutions and colleges of learning.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ... Experimental Operations § 19.34 Experimental or research operations by scientific institutions and colleges of... learning, or institution of scientific research to produce, receive, blend, treat, test, and store spirits... 27 Alcohol, Tobacco Products and Firearms 1 2013-04-01 2013-04-01 false Experimental or...

  17. 27 CFR 19.34 - Experimental or research operations by scientific institutions and colleges of learning.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ... Experimental Operations § 19.34 Experimental or research operations by scientific institutions and colleges of... learning, or institution of scientific research to produce, receive, blend, treat, test, and store spirits... 27 Alcohol, Tobacco Products and Firearms 1 2012-04-01 2012-04-01 false Experimental or...

  18. An Investigation of Strategies of Operation under Conditions of Reduced Funding in Selected Community Colleges.

    ERIC Educational Resources Information Center

    Smith, Norman D.

    This four-part report examines the management of retrenchment at six representative Southern California community colleges and two community college districts: Victor Valley College, Mount San Jacinto College, Citrus College, Chaffey College, Mount San Antonio College, Riverside City College, the San Bernardino Community College District, and the…

  19. Fiscal Year 1979 Operating Budget Recommendations for the Illinois Public Community College System.

    ERIC Educational Resources Information Center

    Illinois Community Coll. Board, Springfield.

    The history of Illinois community college operating finance policy is traced from July 1964 with the establishment of a semester hour flat rate grant (FRG) through the following: an equalization formula in addition to the FRG; supplemental non-business occupational grants; supplemental appropriations during a sudden enrollment increase;…

  20. 27 CFR 19.71 - Experimental or research operations by scientific institutions and colleges of learning.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... 27 Alcohol, Tobacco Products and Firearms 1 2010-04-01 2010-04-01 false Experimental or research operations by scientific institutions and colleges of learning. 19.71 Section 19.71 Alcohol, Tobacco Products and Firearms ALCOHOL AND TOBACCO TAX AND TRADE BUREAU, DEPARTMENT OF THE TREASURY LIQUORS DISTILLED SPIRITS PLANTS Administrative...

  1. Development of Guidelines for the Establishment and Operation of a California Community College Foundation.

    ERIC Educational Resources Information Center

    Nusz, Phyllis Jane

    A study was conducted to research and develop guidelines for the establishment and operation of a California community college foundation. The study involved a review of state regulations for the establishment of a non-profit foundation, a literature review, participation in two fund-raising seminars, personal interviews with foundation staff at…

  2. A comparative analysis of lightweight aggregate and cement kilns operated under the Boiler and Industrial Furnace Rule

    SciTech Connect

    Franklin, G.P.; Jewett, J.J. III

    1994-12-31

    Eighteen lightweight aggregate (LWA) kilns at five locations currently have interim status under the BIF Rule. Two additional LWA kilns at a sixth location are burning hazardous waste fuel under an incinerator permit. Although these units comprise a significant fraction of the existing and potential commercial BIF capacity in the Eastern United States, relatively little technical literature has been generated regarding the burning of hazardous waste in LWA kilns, and both regulators and the public tend to view LWA kilns as a variant of cement kilns. However, along with similarities, there are a number of important differences between these two categories of industrial furnaces. Among the more significant are differences in typical kiln size, raw feed, operating conditions and uses of kiln dust. This paper is a comparative analysis of cement and lightweight aggregate kilns operating under BIF. It addresses design features, raw material and fuel emissions, products and residuals. Both technical and legal/regulatory of differences are analyzed. Finally, the potential impact of EPA`s Waste Combustion Strategy upon LWA kilns is evaluated.

  3. Operating Budget Appropriation and Supporting Technical Data for the Illinois Public Community College System, Fiscal Year 2002.

    ERIC Educational Resources Information Center

    Illinois Community Coll. Board, Springfield.

    This document provides detailed tables of the operating budget appropriation for the Illinois public community college system for fiscal year 2002. This document reflects final audited data and revised decision criteria affecting the appropriation for the community college system. Figures detailed in this report include basic instruction resource…

  4. 14 CFR 93.343 - Requirements for aircraft operations to or from College Park Airport, Potomac Airfield, or...

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ... in 49 CFR part 1562, subpart A; (2) Before departing, the pilot files an IFR or DC FRZ or DC SFRA... from College Park Airport, Potomac Airfield, or Washington Executive/Hyde Field Airport. 93.343 Section... Special Flight Rules Area § 93.343 Requirements for aircraft operations to or from College Park...

  5. 14 CFR 93.343 - Requirements for aircraft operations to or from College Park Airport, Potomac Airfield, or...

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ... in 49 CFR part 1562, subpart A; (2) Before departing, the pilot files an IFR or DC FRZ or DC SFRA... from College Park Airport, Potomac Airfield, or Washington Executive/Hyde Field Airport. 93.343 Section... Special Flight Rules Area § 93.343 Requirements for aircraft operations to or from College Park...

  6. 14 CFR 93.343 - Requirements for aircraft operations to or from College Park Airport, Potomac Airfield, or...

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ... in 49 CFR part 1562, subpart A; (2) Before departing, the pilot files an IFR or DC FRZ or DC SFRA... from College Park Airport, Potomac Airfield, or Washington Executive/Hyde Field Airport. 93.343 Section... Special Flight Rules Area § 93.343 Requirements for aircraft operations to or from College Park...

  7. 14 CFR 93.343 - Requirements for aircraft operations to or from College Park Airport, Potomac Airfield, or...

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ... in 49 CFR part 1562, subpart A; (2) Before departing, the pilot files an IFR or DC FRZ or DC SFRA... from College Park Airport, Potomac Airfield, or Washington Executive/Hyde Field Airport. 93.343 Section... Special Flight Rules Area § 93.343 Requirements for aircraft operations to or from College Park...

  8. 14 CFR 93.343 - Requirements for aircraft operations to or from College Park Airport, Potomac Airfield, or...

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... in 49 CFR part 1562, subpart A; (2) Before departing, the pilot files an IFR or DC FRZ or DC SFRA... from College Park Airport, Potomac Airfield, or Washington Executive/Hyde Field Airport. 93.343 Section... Special Flight Rules Area § 93.343 Requirements for aircraft operations to or from College Park...

  9. Developing a next-generation community college curriculum forenergy-efficient high-performance building operations

    SciTech Connect

    Crabtree, Peter; Kyriakopedi, Nick; Mills, Evan; Haves, Philip; Otto, Roland J.; Piette, Mary Ann; Xu, Peng; Diamond, Rick; Frost, Chuck; Deringer, Joe

    2004-05-01

    The challenges of increased technological demands in today's workplace require virtually all workers to develop higher-order cognitive skills including problem solving and systems thinking in order to be productive. Such ''habits of mind'' are viewed as particularly critical for success in the information-based workplace, which values reduced hierarchy, greater worker independence, teamwork, communications skills, non-routine problem solving, and understanding of complex systems. The need is particularly compelling in the buildings arena. To scope the problem, this paper presents the results of interviews and focus groups--conducted by Oakland California's Peralta Community College District and Lawrence Berkeley National Laboratory--in which approximately 50 industry stakeholders discussed contemporary needs for building operator education at the community college level. Numerous gaps were identified between the education today received by building operators and technicians and current workplace needs. The participants concurred that many of the problems seen today in achieving and maintaining energy savings in buildings can be traced to inadequacies in building operation and lack of awareness and knowledge about how existing systems are to be used, monitored, and maintained. Participants and others we interviewed affirmed that while these issues are addressed in various graduate-level and continuing education programs, they are virtually absent at the community college level. Based on that assessment of industry needs, we present a new curriculum and innovative simulation-based learning tool to provide technicians with skills necessary to commission and operate high-performance buildings, with particular emphasis on energy efficiency and indoor environmental quality in the context of HVAC&R equipment and control systems.

  10. Testing a cumulative and aggregate exposure model using biomonitoring studies and dietary records for Italian vineyard spray operators.

    PubMed

    Kennedy, Marc C; Glass, C Richard; Fustinoni, Silvia; Moretto, Angelo; Mandic-Rajcevic, Stefan; Riso, Patrizia; Turrini, Aida; van der Voet, Hilko; Hetmanski, Michel T; Fussell, Richard J; van Klaveren, Jacob D

    2015-05-01

    The need for improved tools to estimate the cumulative and aggregate exposure to compounds such as plant protection products (PPPs) is recognised in the EU Regulation 1107/2009. A new model has been developed to estimate the exposure within a population to single compounds or compounds within a Cumulative Action Group, considering dietary and non-dietary sources and multiple exposure routes. To test the model a field study was carried out in Italy with operators applying tebuconazole fungicides, with measurements of dermal exposure collected. Whole urine samples were collected and analysed to provide values for the absorbed dose of tebuconazole, with duplicate diet samples collected and analysed as a measure of dietary exposures. The model provided predicted values of exposure for combined dietary and non-dietary routes of exposures which were compared to the measured absorbed dose values based on urinary analysis. The model outputs provided mean daily exposure values of 1.77 (± 1.96) µg a.s./kg BW which are comparable to measured mean values from the biomonitoring field study of 1.73 (± 1.31) µg a.s./kg BW. To supplement the limited measurement data available, comparisons against other models were also made and found to be comparable. PMID:25542526

  11. Oversight and Intervention in the Local Operations of California Community Colleges.

    ERIC Educational Resources Information Center

    Mize, Rita M.

    This paper describes the agencies and organizations with oversight and intervention authority in local community college district affairs, including: (1) locally-elected governing boards; (2) the Board of Governors and California Community College Chancellor's Office; (3) the Accrediting Commission for Community and Junior Colleges; (4) county…

  12. Joint Venture Partnerships: A Scarce Funds Approach to Acquiring and Operating New Facilities at State Colleges and Universities.

    ERIC Educational Resources Information Center

    Elam, Houston G.

    This book explores partnerships between state colleges and universities and local governments to build and operate facilities in light of increasingly scarce funds at the institutions. With new partnerships, institutions risk losing authority over new facilities, but the benefits of joint partnerships far outweigh the risks. Examined are three…

  13. The Four-Day Operational Week Experience at Florida Junior College (FJC): Report of Evaluation Process Study.

    ERIC Educational Resources Information Center

    Stuckman, Jeffrey A.

    An evaluation was conducted at Florida Junior College (FJC) of the four-day operational week implemented during May through August, 1981. Surveys were administered in May and July to day students, full-time teaching faculty, and full-time noninstructional staff to determine their level of satisfaction or dissatisfaction with the four-day week.…

  14. Identification of Institutional Genderedness through Organizational Operations: An Analysis of Community College Working Environments

    ERIC Educational Resources Information Center

    Jones, Stephanie J.; Warnick, Erika M.; Taylor, Colette M.

    2015-01-01

    Though the number of women employed in the workforce has increased, there continues to be an inequity in employment of women in the highest ranks of community colleges. Guided by gendered organizational theory, the study looked at both overt and covert knowledge of genderedness at community colleges. As one might infer, institutional genderedness…

  15. Operating longevity of organic light-emitting diodes with perylene derivatives as aggregating light-emitting-layer additives: Expansion of the emission zone

    NASA Astrophysics Data System (ADS)

    Jarikov, Viktor V.; Young, Ralph H.; Vargas, J. Ramon; Brown, Christopher T.; Klubek, Kevin P.; Liao, Liang-Sheng

    2006-11-01

    We describe aggregating perylene derivatives as light-emitting-layer (LEL) additives in organic light-emitting diodes (OLEDs). These molecules readily form emissive aggregates when added to the LEL. In the resulting devices, the aggregates show moderate external quantum efficiencies of 0.9%-1.7%, which can be improved to 2.7%-4.0% by further adding a proper dopant. Importantly, addition of these polycyclic aromatic hydrocarbons increases the half-life (t50) of undoped and doped OLEDs by 30-150 times. Thus, 11cd/A green and 5.2cd/A red devices are produced that have pure color, Commission Internationale de l'Eclairage 1931 2° color chromaticity coordinates (CIEx ,y) 0.32, 0.63 and 0.64, 0.36, respectively, and t50 of 30 000 and 200 000h, respectively, upon operation at 40mA/cm2. A possible link between the thickness of the emission zone and the lifetime increase is illustrated by comparing aluminum 8-hydroxyquinoline chelate (Alq3) as an LEL host versus an Alq3+dibenzo[b ,k]perylene mixed host using C545T as an emissive probe. The comparison suggests that the emission zone and probably the electron-hole recombination zone are expanded for the mixed host.

  16. Construction aggregates

    USGS Publications Warehouse

    Tepordei, V.V.

    1995-01-01

    Part of the 1994 Industrial Minerals Review. The production, consumption, and applications of construction aggregates are reviewed. In 1994, the production of construction aggregates, which includes crushed stone and construction sand and gravel combined, increased 7.7 percent to 2.14 Gt compared with the previous year. These record production levels are mostly a result of funding for highway construction work provided by the Intermodal Surface Transportation Efficiency Act of 1991. Demand is expected to increase for construction aggregates in 1995.

  17. Howard Community College 1986-87 Institutional Indicators for Proposed Operating Budget.

    ERIC Educational Resources Information Center

    Radcliffe, Susan; Novak, Virginia E.

    This report presents a series of graphs and tables, offering information on students, instruction, faculty, and finances at Howard Community College (HCC) in Columbia, Maryland. Part 1 provides profiles and projections of HCC's students, including a 10-year overview of full-time equivalent (FTE) enrollment, 1976-85; enrollment projections,…

  18. Beyond Lip-Service: An Operational Definition of "Learning-Centered College"

    ERIC Educational Resources Information Center

    Bosch, William C.; Hester, Jessica L.; MacEntee, Virginia M.; MacKenzie, James A.; Morey, T. Mark; Nichols, James T.; Pacitti, Patricia A.; Shaffer, Barbara A.; Tomascak, Paul B.; Weber, Suzanne P.; Young, Rosalie R.

    2008-01-01

    Faculty, staff, and student perceptions of high-quality learning experiences were explored using focus groups attempting to define a "learning-centered" college. Common themes emerged suggesting that a successful learning community requires faculty-student collaboration, effective communication, critical thinking skills, reciprocal respect,…

  19. A Systems Approach to the Design and Operation of Effective Marketing Programs in Community Colleges.

    ERIC Educational Resources Information Center

    Scigliano, John A.

    1983-01-01

    Presents a research-based marketing model consisting of an environmental scanning process, a series of marketing audits, and an information-processing scheme. Views the essential elements of college marketing as information flow; high-level, long-term commitment; diverse strategies; innovation; and a broad view of marketing. Includes a marketing…

  20. The Effect of Florida's Bright Futures Program on College Enrollment and Degree Production: An Aggregated-Level Analysis

    ERIC Educational Resources Information Center

    Zhang, Liang; Hu, Shouping; Sensenig, Victor

    2013-01-01

    In this study, we investigate the impact of the Bright Futures Scholarship Program on college enrollment and degree production in Florida by using IPEDS enrollment, migration, and completion data. Results suggest large and significant enrollment effects at Florida's public 4- and 2-year institutions, for both full-time and part-time…

  1. Construction aggregates

    USGS Publications Warehouse

    Langer, W.H.; Tepordei, V.V.; Bolen, W.P.

    2000-01-01

    Construction aggregates consist primarily of crushed stone and construction sand and gravel. Total estimated production of construction aggregates increased in 1999 by about 2% to 2.39 Gt (2.64 billion st) compared with 1998. This record production level continued an expansion that began in 1992. By commodities, crushed stone production increased 3.3%, while sand and gravel production increased by about 0.5%.

  2. Construction aggregates

    USGS Publications Warehouse

    Tepordei, V.V.

    1994-01-01

    Part of a special section on industrial minerals in 1993. The 1993 production of construction aggregates increased 6.3 percent over the 1992 figure, to reach 2.01 Gt. This represents the highest estimated annual production of combined crushed stone and construction sand and gravel ever recorded in the U.S. The outlook for construction aggregates and the issues facing the industry are discussed.

  3. A Proposal to the President to Establish a Year-Round Operation and an Annual Assignment System for Omega College, Beginning Summer 1974.

    ERIC Educational Resources Information Center

    Reda, Mario R.

    The purpose of this paper is the presentation of a proposal for a year-round operation and an annual assignment system (YRO/AAS) to the administrative officers of the College of DuPage, Glen Ellyn, Illinois. The proposal is comprised of four chapters. The first chapter deals with the significance of the study in terms of the College of DuPage's…

  4. Construction aggregates

    USGS Publications Warehouse

    Tepordei, V.V.

    1993-01-01

    Part of a special section on the market performance of industrial minerals in 1992. Production of construction aggregates increased by 4.6 percent in 1992. This increase was due, in part, to the increased funding for transportation and infrastructure projects. The U.S. produced about 1.05 Gt of crushed stone and an estimated 734 Mt of construction sand and gravel in 1992. Demand is expected to increase by about 5 percent in 1993.

  5. Construction aggregates

    USGS Publications Warehouse

    Tepordei, V.V.

    1996-01-01

    Part of the Annual Commodities Review 1995. Production of construction aggregates such as crushed stone and construction sand and gravel showed a marginal increase in 1995. Most of the 1995 increases were due to funding for highway construction work. The major areas of concern to the industry included issues relating to wetlands classification and the classification of crystalline silica as a probable human carcinogen. Despite this, an increase in demand is anticipated for 1996.

  6. Construction aggregates

    USGS Publications Warehouse

    Nelson, T.I.; Bolen, W.P.

    2007-01-01

    Construction aggregates, primarily stone, sand and gravel, are recovered from widespread naturally occurring mineral deposits and processed for use primarily in the construction industry. They are mined, crushed, sorted by size and sold loose or combined with portland cement or asphaltic cement to make concrete products to build roads, houses, buildings, and other structures. Much smaller quantities are used in agriculture, cement manufacture, chemical and metallurgical processes, glass production and many other products.

  7. 77 FR 26321 - Reed College, Reed Research Nuclear Reactor, Renewed Facility Operating License No. R-112

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-05-03

    ... Opportunity for Hearing published in the Federal Register on August 19, 2011 (76 FR 52018- 52022). The NRC... Register on March 30, 2012 (77 FR 19362-19366), and concluded that renewal of the facility operating...-water cooled, and shielded TRIGA (Training, Research, Isotope Production, General Atomics) reactor...

  8. Arkansas Public Higher Education Operating Recommendations: Fiscal Year 2010-11. Volume 2: Colleges

    ERIC Educational Resources Information Center

    Arkansas Department of Higher Education, 2010

    2010-01-01

    This publication provides summaries of appropriations of public higher education institutions in Arkansas for the Fiscal Year 2010-11. It also provides operating recommendations of the Arkansas Public Higher Education Coordinating Board for the Fiscal Year 2010-11 for each institution. [For Volume 1, see ED511332.

  9. Regional Comparative Unit Cost Studies for Maintenance and Operation of Physical Plants in Universities and Colleges in Central States Region and Rocky Mountain Region.

    ERIC Educational Resources Information Center

    Association of Physical Plant Administrators, Corvallis, OR.

    Presented in this document are data pertaining to maintenance and operations costs at colleges and universities in the central states region and the Rocky Mountain region. The major accounts included in the cost analysis are: (1) physical plant administration, (2) building maintenance, (3) custodial services, (4) utilities, (5) landscape and…

  10. Construction aggregates

    USGS Publications Warehouse

    Bolen, W.P.; Tepordei, V.V.

    2001-01-01

    The estimated production during 2000 of construction aggregates, crushed stone, and construction sand and gravel increased by about 2.6% to 2.7 Gt (3 billion st), compared with 1999. The expansion that started in 1992 continued with record production levels for the ninth consecutive year. By commodity, construction sand and gravel production increased by 4.5% to 1.16 Gt (1.28 billion st), while crushed stone production increased by 1.3% to 1.56 Gt (1.72 billion st).

  11. Aggregation server for grid-integrated vehicles

    SciTech Connect

    Kempton, Willett

    2015-05-26

    Methods, systems, and apparatus for aggregating electric power flow between an electric grid and electric vehicles are disclosed. An apparatus for aggregating power flow may include a memory and a processor coupled to the memory to receive electric vehicle equipment (EVE) attributes from a plurality of EVEs, aggregate EVE attributes, predict total available capacity based on the EVE attributes, and dispatch at least a portion of the total available capacity to the grid. Power flow may be aggregated by receiving EVE operational parameters from each EVE, aggregating the received EVE operational parameters, predicting total available capacity based on the aggregated EVE operational parameters, and dispatching at least a portion of the total available capacity to the grid.

  12. FLORIDA'S PUBLIC JUNIOR COLLEGES.

    ERIC Educational Resources Information Center

    Florida State Dept. of Education, Tallahassee.

    ORGANIZATION AND OPERATION OF FLORIDA'S SYSTEM OF JUNIOR COLLEGES ARE DESCRIBED. EIGHTY-TWO PERCENT OF THE STATE'S HIGH SCHOOL GRADUATES LIVE WITHIN COMMUTING DISTANCE OF A COMMUNITY COLLEGE, AND INCREASING PERCENTAGES TAKE ADVANTAGE OF THE OPPORTUNITY FOR LOWER DIVISION, VOCATIONAL-TECHNICAL, OR ADULT EDUCATION AT ONE OF THE 29 COLLEGES.…

  13. Toward Conceptualization of Learning Processes in the College Classroom II: Considerations From Operant and Social Learning Theory.

    ERIC Educational Resources Information Center

    Martin, Robert F.

    The focus of this paper is the application of laboratory-derived principles to a more real-life situation. Specifically, a learning model is presented with the intent that principles and procedures derived from it be directly applicable to learning in the college classroom. The model presented is derived from 2 orientation to the phenomena of…

  14. College education

    NASA Technical Reports Server (NTRS)

    Criswell, David R.

    1990-01-01

    Space Grant Colleges and Universities must build the space curriculum of the future on the firm basis of deep knowledge of an involvement with the present operating programs of the nation and an on-going and extensive program of leading edge research in the aerospace sciences and engineering, management, law, finance, and the other arts that are integral to our planetary society. The Space Grant College and Fellowship Program must create new academic fields of enquiry, which is a long and difficult process that will require deeper and broader interaction between NASA and academia than has previously existed.

  15. Applications of aggregation theory to sustainability assessment

    DOE PAGESBeta

    Pollesch, N.; Dale, V. H.

    2015-04-01

    In order to aid in transition towards operations that promote sustainability goals, researchers and stakeholders use sustainability assessments. Although assessments take various forms, many utilize diverse sets of indicators that can number anywhere from two to over 2000. Indices, composite indicators, or aggregate values are used to simplify high dimensional and complex data sets and to clarify assessment results. Although the choice of aggregation function is a key component in the development of the assessment, there are few examples to be found in literature to guide appropriate aggregation function selection. This paper develops a connection between the mathematical study ofmore » aggregation functions and sustainability assessment in order to aid in providing criteria for aggregation function selection. Relevant mathematical properties of aggregation functions are presented and interpreted. Lastly, we provide cases of these properties and their relation to previous sustainability assessment research. Examples show that mathematical aggregation properties can be used to address the topics of compensatory behavior and weak versus strong sustainability, aggregation of data under varying units of measurements, multiple site multiple indicator aggregation, and the determination of error bounds in aggregate output for normalized and non-normalized indicator measures.« less

  16. Applications of aggregation theory to sustainability assessment

    SciTech Connect

    Pollesch, N.; Dale, V. H.

    2015-04-01

    In order to aid in transition towards operations that promote sustainability goals, researchers and stakeholders use sustainability assessments. Although assessments take various forms, many utilize diverse sets of indicators that can number anywhere from two to over 2000. Indices, composite indicators, or aggregate values are used to simplify high dimensional and complex data sets and to clarify assessment results. Although the choice of aggregation function is a key component in the development of the assessment, there are few examples to be found in literature to guide appropriate aggregation function selection. This paper develops a connection between the mathematical study of aggregation functions and sustainability assessment in order to aid in providing criteria for aggregation function selection. Relevant mathematical properties of aggregation functions are presented and interpreted. Lastly, we provide cases of these properties and their relation to previous sustainability assessment research. Examples show that mathematical aggregation properties can be used to address the topics of compensatory behavior and weak versus strong sustainability, aggregation of data under varying units of measurements, multiple site multiple indicator aggregation, and the determination of error bounds in aggregate output for normalized and non-normalized indicator measures.

  17. Ash Aggregates in Proximal Settings

    NASA Astrophysics Data System (ADS)

    Porritt, L. A.; Russell, K.

    2012-12-01

    Ash aggregates are thought to have formed within and been deposited by the eruption column and plume and dilute density currents and their associated ash clouds. Moist, turbulent ash clouds are considered critical to ash aggregate formation by facilitating both collision and adhesion of particles. Consequently, they are most commonly found in distal deposits. Proximal deposits containing ash aggregates are less commonly observed but do occur. Here we describe two occurrences of vent proximal ash aggregate-rich deposits; the first within a kimberlite pipe where coated ash pellets and accretionary lapilli are found within the intra-vent sequence; and the second in a glaciovolcanic setting where cored pellets (armoured lapilli) occur within <1 km of the vent. The deposits within the A418 pipe, Diavik Diamond Mine, Canada, are the residual deposits within the conduit and vent of the volcano and are characterised by an abundance of ash aggregates. Coated ash pellets are dominant but are followed in abundance by ash pellets, accretionary lapilli and rare cored pellets. The coated ash pellets typically range from 1 - 5 mm in diameter and have core to rim ratios of approximately 10:1. The formation and preservation of these aggregates elucidates the style and nature of the explosive phase of kimberlite eruption at A418 (and other pipes?). First, these pyroclasts dictate the intensity of the kimberlite eruption; it must be energetic enough to cause intense fragmentation of the kimberlite to produce a substantial volume of very fine ash (<62 μm). Secondly, the ash aggregates indicate the involvement of moisture coupled with the presence of dilute expanded eruption clouds. The structure and distribution of these deposits throughout the kimberlite conduit demand that aggregation and deposition operate entirely within the confines of the vent; this indicates that aggregation is a rapid process. Ash aggregates within glaciovolcanic sequences are also rarely documented. The

  18. Platelet aggregation test

    MedlinePlus

    ... this page: //medlineplus.gov/ency/article/003669.htm Platelet aggregation test To use the sharing features on this page, please enable JavaScript. The platelet aggregation blood test checks how well platelets , a ...

  19. Thermodynamics of Protein Aggregation

    NASA Astrophysics Data System (ADS)

    Osborne, Kenneth L.; Barz, Bogdan; Bachmann, Michael; Strodel, Birgit

    Amyloid protein aggregation characterizes many neurodegenerative disorders, including Alzheimer's, Parkinson's, and Creutz- feldt-Jakob disease. Evidence suggests that amyloid aggregates may share similar aggregation pathways, implying simulation of full-length amyloid proteins is not necessary for understanding amyloid formation. In this study we simulate GNNQQNY, the N-terminal prion-determining domain of the yeast protein Sup35 to investigate the thermodynamics of structural transitions during aggregation. We use a coarse-grained model with replica-exchange molecular dynamics to investigate the association of 3-, 6-, and 12-chain GNNQQNY systems and we determine the aggregation pathway by studying aggregation states of GN- NQQNY. We find that the aggregation of the hydrophilic GNNQQNY sequence is mainly driven by H-bond formation, leading to the formation of /3-sheets from the very beginning of the assembly process. Condensation (aggregation) and ordering take place simultaneously, which is underpinned by the occurrence of a single heat capacity peak only.

  20. Platelet aggregation test

    MedlinePlus

    The platelet aggregation blood test checks how well platelets , a part of blood, clump together and cause blood to clot. ... Decreased platelet aggregation may be due to: Autoimmune ... Fibrin degradation products Inherited platelet function defects ...

  1. Environmentalism and natural aggregate mining

    USGS Publications Warehouse

    Drew, L.J.; Langer, W.H.; Sachs, J.S.

    2002-01-01

    Sustaining a developed economy and expanding a developing one require the use of large volumes of natural aggregate. Almost all human activity (commercial, recreational, or leisure) is transacted in or on facilities constructed from natural aggregate. In our urban and suburban worlds, we are almost totally dependent on supplies of water collected behind dams and transported through aqueducts made from concrete. Natural aggregate is essential to the facilities that produce energy-hydroelectric dams and coal-fired powerplants. Ironically, the utility created for mankind by the use of natural aggregate is rarely compared favorably with the environmental impacts of mining it. Instead, the empty quarries and pits are seen as large negative environmental consequences. At the root of this disassociation is the philosophy of environmentalism, which flavors our perceptions of the excavation, processing, and distribution of natural aggregate. The two end-member ideas in this philosophy are ecocentrism and anthropocentrism. Ecocentrism takes the position that the natural world is a organism whose arteries are the rivers-their flow must not be altered. The soil is another vital organ and must not be covered with concrete and asphalt. The motto of the ecocentrist is "man must live more lightly on the land." The anthropocentrist wants clean water and air and an uncluttered landscape for human use. Mining is allowed and even encouraged, but dust and noise from quarry and pit operations must be minimized. The large volume of truck traffic is viewed as a real menace to human life and should be regulated and isolated. The environmental problems that the producers of natural aggregate (crushed stone and sand and gravel) face today are mostly difficult social and political concerns associated with the large holes dug in the ground and the large volume of heavy truck traffic associated with quarry and pit operations. These concerns have increased in recent years as society's demand for

  2. Operations

    ERIC Educational Resources Information Center

    Wilkins, Jesse L. M.; Norton, Anderson; Boyce, Steven J.

    2013-01-01

    Previous research has documented schemes and operations that undergird students' understanding of fractions. This prior research was based, in large part, on small-group teaching experiments. However, written assessments are needed in order for teachers and researchers to assess students' ways of operating on a whole-class scale. In this…

  3. Planning and Strategy for Setting Up and Operating Academic Libraries in Temporary Quarters: Experiences of Two Northeast Colleges.

    ERIC Educational Resources Information Center

    Nelson, Garet; Stanley, Laurel; Eyman, David; Seiden, Peggy

    The prospect of resolving a library's space and utilization problems through expansion and renovation carries with it the question of how to maintain operations during construction. Few libraries, especially those in the academic world, can afford to close their doors for very long, even though the prospect of maintaining ongoing operations amid…

  4. College Cambrian College Board of Governors Resource Manual.

    ERIC Educational Resources Information Center

    Barber, Paula; Lafrance, Glenys

    Intended as a resource manual for new and continuing governing board members of College Cambrian College (CCC) in Ontario, Canada, this five-part guide includes information on board member orientation; the Ontario College System (OCS); the history, mission and operations of CCC; activities, responsibilities, and tenure of board members; and…

  5. Challenge College, Bradford

    ERIC Educational Resources Information Center

    Flecknoe, Mervyn

    2004-01-01

    What can you expect from a school in an area of high crime where 50 percent of the pupils take free school meals and which operates on a site that cannot be accessed from its main catchment area? In this article, the author shares his experience when he visited Challenge College. A low wall separates Challenge College from the area where most of…

  6. THE COLLEGE COMMISSIONS.

    ERIC Educational Resources Information Center

    FOOKS, JOYCE LANE

    THE HISTORIES, ORGANIZATIONAL STRUCTURES, MODES OF OPERATION, GOALS, AND SPECIFIC ACTIVITIES OF EIGHT COLLEGE SCIENCE COMMISSIONS ARE PRESENTED. THE GOAL OF THE EIGHT COLLEGE SCIENCE COMMISSIONS IS TO BRING UNDERGRADUATE SCIENCE INSTRUCTION CLOSER TO THE RESEARCH FRONTIER, UPDATE COURSES, AND FOSTER THE SPIRIT OF INQUIRY. INTERCOMMISSION…

  7. Arkansas Public Higher Education Operating & Capital Recommendations, 2011-2013 Biennium. 7-A. Volume 2: Two-Year Colleges

    ERIC Educational Resources Information Center

    Arkansas Department of Higher Education, 2010

    2010-01-01

    This publication details the institutional goals, objectives, and strategies of public two-year institutions in Arkansas as related to their appropriations requests. It also provides operating and capital recommendations of the Arkansas Public Higher Education Coordinating Board for 2011-2013 biennium for each institution. [For Volume 1, see…

  8. Aggregations in Flatworms.

    ERIC Educational Resources Information Center

    Liffen, C. L.; Hunter, M.

    1980-01-01

    Described is a school project to investigate aggregations in flatworms which may be influenced by light intensity, temperature, and some form of chemical stimulus released by already aggregating flatworms. Such investigations could be adopted to suit many educational levels of science laboratory activities. (DS)

  9. Before We're Up to Our Necks in Aggregators, Let's Get out Our Net "Value" Calculators!

    ERIC Educational Resources Information Center

    Butler, Lawrence

    2012-01-01

    No sooner has the Net Price Calculator (NPC) wave crashed ashore, the next wave of college-choice transparency in the form of third-party data aggregators is threatening to engulf American colleges and universities. Since last October, NPCs have become a fact of life for American colleges and universities. Some are doing the bare minimum to comply…

  10. Charged Dust Aggregate Interactions

    NASA Astrophysics Data System (ADS)

    Matthews, Lorin; Hyde, Truell

    2015-11-01

    A proper understanding of the behavior of dust particle aggregates immersed in a complex plasma first requires a knowledge of the basic properties of the system. Among the most important of these are the net electrostatic charge and higher multipole moments on the dust aggregate as well as the manner in which the aggregate interacts with the local electrostatic fields. The formation of elongated, fractal-like aggregates levitating in the sheath electric field of a weakly ionized RF generated plasma discharge has recently been observed experimentally. The resulting data has shown that as aggregates approach one another, they can both accelerate and rotate. At equilibrium, aggregates are observed to levitate with regular spacing, rotating about their long axis aligned parallel to the sheath electric field. Since gas drag tends to slow any such rotation, energy must be constantly fed into the system in order to sustain it. A numerical model designed to analyze this motion provides both the electrostatic charge and higher multipole moments of the aggregate while including the forces due to thermophoresis, neutral gas drag, and the ion wakefield. This model will be used to investigate the ambient conditions leading to the observed interactions. This research is funded by NSF Grant 1414523.

  11. A Novel Method to Quantify Soil Aggregate Stability by Measuring Aggregate Bond Energies

    NASA Astrophysics Data System (ADS)

    Efrat, Rachel; Rawlins, Barry G.; Quinton, John N.; Watts, Chris W.; Whitmore, Andy P.

    2016-04-01

    Soil aggregate stability is a key indicator of soil quality because it controls physical, biological and chemical functions important in cultivated soils. Micro-aggregates are responsible for the long term sequestration of carbon in soil, therefore determine soils role in the carbon cycle. It is thus vital that techniques to measure aggregate stability are accurate, consistent and reliable, in order to appropriately manage and monitor soil quality, and to develop our understanding and estimates of soil as a carbon store to appropriately incorporate in carbon cycle models. Practices used to assess the stability of aggregates vary in sample preparation, operational technique and unit of results. They use proxies and lack quantification. Conflicting results are therefore drawn between projects that do not provide methodological or resultant comparability. Typical modern stability tests suspend aggregates in water and monitor fragmentation upon exposure to an un-quantified amount of ultrasonic energy, utilising a laser granulometer to measure the change in mean weight diameter. In this project a novel approach has been developed based on that of Zhu et al., (2009), to accurately quantify the stability of aggregates by specifically measuring their bond energies. The bond energies are measured operating a combination of calorimetry and a high powered ultrasonic probe, with computable output function. Temperature change during sonication is monitored by an array of probes which enables calculation of the energy spent heating the system (Ph). Our novel technique suspends aggregates in heavy liquid lithium heteropolytungstate, as opposed to water, to avoid exposing aggregates to an immeasurable disruptive energy source, due to cavitation, collisions and clay swelling. Mean weight diameter is measured by a laser granulometer to monitor aggregate breakdown after successive periods of calculated ultrasonic energy input (Pi), until complete dispersion is achieved and bond

  12. Aggregate and the environment

    USGS Publications Warehouse

    Langer, William H.; Drew, Lawrence J.; Sachs, J.S.

    2004-01-01

    This book is designed to help you understand our aggregate resources-their importance, where they come from, how they are processed for our use, the environmental concerns related to their mining and processing, how those concerns are addressed, and the policies and regulations designed to safeguard workers, neighbors, and the environment from the negative impacts of aggregate mining. We hope this understanding will help prepare you to be involved in decisions that need to be made-individually and as a society-to be good stewards of our aggregate resources and our living planet.

  13. Protein Colloidal Aggregation Project

    NASA Technical Reports Server (NTRS)

    Oliva-Buisson, Yvette J. (Compiler)

    2014-01-01

    To investigate the pathways and kinetics of protein aggregation to allow accurate predictive modeling of the process and evaluation of potential inhibitors to prevalent diseases including cataract formation, chronic traumatic encephalopathy, Alzheimer's Disease, Parkinson's Disease and others.

  14. A Comparison of Working Conditions Between Community College Instructors in Collective Bargaining Contract Colleges and Traditional Colleges.

    ERIC Educational Resources Information Center

    DePaoli, John A., Jr.

    In order to assess the impact of collective bargaining on community college faculty working conditions, a 79-item questionnaire was sent in winter 1974 to the presidents of a random nationwide sample of 100 community colleges operating under collective bargaining contracts and 100 community colleges operating under traditional agreements. Of the…

  15. A comparison of thermal zone aggregation methods

    SciTech Connect

    Dobbs, Justin R.; Hencey, Brandon M.

    2012-12-10

    The impact of increasing energy prices on building operation budgets has fueled demand for more energy-efficient structures. Existing building energy simulation tools generate an immense amount of data yet comparatively little knowledge. This paper introduces a framework that allows aggregation-based model reduction to operate on geometric building information models. The resulting aggregation sequence provides designers with faster simulations and affords insight into complex multi-scale thermal interactions. A comparison of the trade-off between simulation speed and accuracy for three hierarchical cluster partitioning methods concludes the discussion.

  16. 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;…

  17. Particle aggregation mechanisms in ionic liquids.

    PubMed

    Szilagyi, Istvan; Szabo, Tamas; Desert, Anthony; Trefalt, Gregor; Oncsik, Tamas; Borkovec, Michal

    2014-05-28

    Aggregation of sub-micron and nano-sized polystyrene latex particles was studied in room temperature ionic liquids (ILs) and in their water mixtures by time-resolved light scattering. The aggregation rates were found to vary with the IL-to-water molar ratio in a systematic way. At the water side, the aggregation rate is initially small, but increases rapidly with increasing IL content, and reaches a plateau value. This behaviour resembles simple salts, and can be rationalized by the competition of double-layer and van der Waals forces as surmised by the classical theory of Derjaguin, Landau, Verwey, and Overbeek (DLVO). At the IL side, aggregation slows down again. Two generic mechanisms could be identified to be responsible for the stabilization in ILs, namely viscous stabilization and solvation stabilization. Viscous stabilization is important in highly viscous ILs, as it originates from the slowdown of the diffusion controlled aggregation due to the hindrance of the diffusion in a viscous liquid. The solvation stabilization mechanism is system specific, but can lead to a dramatic slowdown of the aggregation rate in ILs. This mechanism is related to repulsive solvation forces that are operational in ILs due to the layering of the ILs close to the surfaces. These two stabilization mechanisms are suspected to be generic, as they both occur in different ILs, and for particles differing in surface functionalities and size. PMID:24727976

  18. Operational Amplifiers.

    ERIC Educational Resources Information Center

    Foxcroft, G. E.

    1986-01-01

    Addresses the introduction of low cost equipment into high school and college physical science classes. Examines the properties of an "ideal" operational amplifier and discusses how it might be used under saturated and non-saturated conditions. Notes the action of a "real" operational amplifier. (TW)

  19. Aggregate Remote Memory Copy Interface

    2006-02-23

    The purpose of the Aggregate Remote Memory Copy (ARMCI) library is to provide a general- purpose, efficient, and Widely portable remote memory access (RMA) operations (one-sided communication) optimized for Contiguous and noncontiguous (strided, scatter/gather, I/O vector) data transfers. In addition, ARMCI includes a set of atomic and mutual exclusion operations. The development ARMCI is driven by the need to support the global-addres space communication model in context of distributed regular or irregular distributed data structures,more » communication libraries, and compilers. ARMCI is a standalone system that could be used to support user-level libraries and applications that use MPI or PVM.« less

  20. Technology meets aggregate

    SciTech Connect

    Wilson, C.; Swan, C.

    2007-07-01

    New technology carried out at Tufts University and the University of Massachusetts on synthetic lightweight aggregate has created material from various qualities of fly ash from coal-fired power plants for use in different engineered applications. In pilot scale manufacturing tests an 'SLA' containing 80% fly ash and 20% mixed plastic waste from packaging was produced by 'dry blending' mixed plastic with high carbon fly ash. A trial run was completed to produce concrete masonry unit (CMU) blocks at a full-scale facility. It has been shown that SLA can be used as a partial substitution of a traditional stone aggregate in hot asphalt mix. 1 fig., 2 photos.

  1. 42 CFR 425.702 - Aggregate reports.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... following information, deidentified in accordance with 45 CFR 164.514(b): (1) Aggregated metrics on the... within the first or second paragraph of the definition of health care operations at 45 CFR 164.501. (ii... CFR 164.501 on behalf of those participants....

  2. 42 CFR 425.702 - Aggregate reports.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... following information, deidentified in accordance with 45 CFR 164.514(b): (1) Aggregated metrics on the... within the first or second paragraph of the definition of health care operations at 45 CFR 164.501. (ii... CFR 164.501 on behalf of those participants....

  3. 42 CFR 425.702 - Aggregate reports.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... following information, deidentified in accordance with 45 CFR 164.514(b): (1) Aggregated metrics on the... within the first or second paragraph of the definition of health care operations at 45 CFR 164.501. (ii... CFR 164.501 on behalf of those participants....

  4. College Readiness

    ERIC Educational Resources Information Center

    Chapa, Marisa; Galvan-De Leon, Vanessa; Solis, Judith; Mundy, Marie-Anne

    2014-01-01

    During the 79th Texas Legislature, the bill "Advancement of College Readiness in Curriculum" was passed (THECB). As a response to this, high schools and colleges have combined forming an early college high school. The result of this union was a program that condensed the time it took to complete both the high school diploma and up to two…

  5. College Connection

    ERIC Educational Resources Information Center

    Hewitt, Kimberly Kappler; Scalzo, Mary Jo

    2012-01-01

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

  6. Aggregates, broccoli and cauliflower

    NASA Astrophysics Data System (ADS)

    Grey, Francois; Kjems, Jørgen K.

    1989-09-01

    Naturally grown structures with fractal characters like broccoli and cauliflower are discussed and compared with DLA-type aggregates. It is suggested that the branching density can be used to characterize the growth process and an experimental method to determine this parameter is proposed.

  7. The College Work-Study Program at Boston College.

    ERIC Educational Resources Information Center

    McCarthy, Joseph M.; And Others

    During the calendar year 1968, Boston College provided jobs for 783 students under the Federal College Work-Study Program. The jobs ranged from simple clerical to complex community service and computer operation positions, and every attempt was made to place students in positions related to the individual's educational experience and career goals.…

  8. Phosphorus recovery from wastewater by struvite crystallization: property of aggregates.

    PubMed

    Ye, Zhilong; Shen, Yin; Ye, Xin; Zhang, Zhaoji; Chen, Shaohua; Shi, Jianwen

    2014-05-01

    Struvite crystallization is a promising method to remove and recover phosphorus from wastewater to ease both the scarcity of phosphorus rock resources and water eutrophication worldwide. To date, although various kinds of reactor systems have been developed, supporting methods are required to control the struvite fines flushing out of the reactors. As an intrinsic property, aggregation is normally disregarded in the struvite crystallization process, although it is the key factor in final particle size and therefore guarantees phosphorus recovery efficiency. The present study developed a method to analyze the characteristics of struvite aggregates using fractal geometry, and the influence of operational parameters on struvite aggregation was evaluated. Due to its typical orthorhombic molecular structure, struvite particles are prone to crystallize into needle or rod shapes, and aggregate at the corners or edges of crystals. The determined fractal dimension (Dpf) of struvite aggregates was 1.52-1.31, with the corresponding range of equivalent diameter (d0.5) at 295.9-85.4 μm. Aggregates formed in relatively low phosphorus concentrations (3.0-5.0 mmol/L) and mildly alkaline conditions (pH 9.0-9.5) displayed relatively compact structures, large aggregate sizes and high aggregation strength. Increasing pH values led to continuous decrease of aggregate sizes, while the variation of Dpf was insignificant. As to the aggregate evolution, fast growth in a short time followed by a long steady stage was observed. PMID:25079629

  9. Tough Questions Facing Women's Colleges

    ERIC Educational Resources Information Center

    Kratzok, Sara

    2010-01-01

    Since their creation in the latter part of the nineteenth century, women's colleges in America have undergone many significant changes. In 1960, over 230 women's colleges were in operation; over the next forty years more than 75 percent chose to admit men or shut their doors entirely (Miller-Bernal, 2006a). This chapter will shed light on the…

  10. Photophoretic force on aggregate grains

    NASA Astrophysics Data System (ADS)

    Matthews, Lorin S.; Kimery, Jesse B.; Wurm, Gerhard; de Beule, Caroline; Kuepper, Markus; Hyde, Truell W.

    2016-01-01

    The photophoretic force may impact planetary formation by selectively moving solid particles based on their composition and structure. This generates collision velocities between grains of different sizes and sorts the dust in protoplanetary discs by composition. This numerical simulation studied the photophoretic force acting on fractal dust aggregates of μm-scale radii. Results show that aggregates tend to have greater photophoretic drift velocities than spheres of similar mass or radii, though with a greater spread in the velocity. While the drift velocities of compact aggregates continue to increase as the aggregates grow larger in size, fluffy aggregates have drift velocities which are relatively constant with size. Aggregates formed from an initially polydisperse size distribution of dust grains behave differently from aggregates formed from a monodisperse population, having smaller drift velocities with directions which deviate substantially from the direction of illumination. Results agree with microgravity experiments which show the difference of photophoretic forces with aggregation state.

  11. Survey of Writing Centers in Community Colleges.

    ERIC Educational Resources Information Center

    McKeague, Patricia M.; Reis, Elizabeth

    In 1990, Moraine Valley Community College conducted a study of writing centers at community colleges belonging to the League for Innovation in the Community College. The survey was designed to gather information on the staffing, facilities, services, operations, budget, and evaluation of writing centers. Questionnaires were sent to and returned by…

  12. THE ETHICS AND POLITICS OF COLLEGE PSYCHIATRY.

    ERIC Educational Resources Information Center

    SZASZ, THOMAS S.

    THE PRINCIPLES OF CONDUCT GOVERNING COLLEGE PSYCHIATRISTS AND THE RELATIONSHIPS BETWEEN THESE AUTHORITIES AND THEIR SUBJECTS ARE EXAMINED. MUCH OF THE WORK OF THE COLLEGE PSYCHIATRIST CONSISTS OF CRISIS INTERVENTION. THE COLLEGE PSYCHIATRIST OFTEN OPERATES AS BOTH A POLICE INTERROGATOR AND JUDGE. THE CHARACTERISTIC FEATURE OF HIS ROLE IS ITS…

  13. Advancing the Community College Strategic Plan.

    ERIC Educational Resources Information Center

    Herbkersman, Neil; Hibbert-Jones, Karla

    2002-01-01

    Discusses the importance of developing a comprehensive grants development process to advance community college strategic plans, especially in the current economic climate. Details the process as developed and implemented by Sinclair Community College (Ohio). States that colleges that employ methodical processes and effective operating systems to…

  14. Proteins aggregation and human diseases

    NASA Astrophysics Data System (ADS)

    Hu, Chin-Kun

    2015-04-01

    Many human diseases and the death of most supercentenarians are related to protein aggregation. Neurodegenerative diseases include Alzheimer's disease (AD), Huntington's disease (HD), Parkinson's disease (PD), frontotemporallobar degeneration, etc. Such diseases are due to progressive loss of structure or function of neurons caused by protein aggregation. For example, AD is considered to be related to aggregation of Aβ40 (peptide with 40 amino acids) and Aβ42 (peptide with 42 amino acids) and HD is considered to be related to aggregation of polyQ (polyglutamine) peptides. In this paper, we briefly review our recent discovery of key factors for protein aggregation. We used a lattice model to study the aggregation rates of proteins and found that the probability for a protein sequence to appear in the conformation of the aggregated state can be used to determine the temperature at which proteins can aggregate most quickly. We used molecular dynamics and simple models of polymer chains to study relaxation and aggregation of proteins under various conditions and found that when the bending-angle dependent and torsion-angle dependent interactions are zero or very small, then protein chains tend to aggregate at lower temperatures. All atom models were used to identify a key peptide chain for the aggregation of insulin chains and to find that two polyQ chains prefer anti-parallel conformation. It is pointed out that in many cases, protein aggregation does not result from protein mis-folding. A potential drug from Chinese medicine was found for Alzheimer's disease.

  15. Custodial Operations: Green & Sustainable

    ERIC Educational Resources Information Center

    Campbell, J. Kirk

    2008-01-01

    Custodial Operations can have a significant impact on institutional green and sustainable goals if given the proper support and challenge. This article describes the green and sustainable custodial operations in place at Carleton College in Northfield, Minnesota. The article reviews the college's sustainable efforts on biodegradables, packaging,…

  16. Public Assistance Recipients in Washington Community Colleges: Family Independence Program (FIP) and Aid to Families with Dependent Children (AFDC). Operations Report No. 90-4.

    ERIC Educational Resources Information Center

    Washington State Board for Community Coll. Education, Olympia.

    During the 1989-90 academic year, the Washington community colleges enrolled nearly 15,000 individuals receiving public assistance under the Family Independence Program (FIP) and Aid to Families with Dependent Children (AFDC), representing about 5% of the total student population. A joint project was conducted by the staff of the State Board for…

  17. Department of Education's College Construction Loan Programs. Hearing before a Subcommittee of the Committee on Government Operations. House of Representatives, Ninety-Eighth Congress, Second Session.

    ERIC Educational Resources Information Center

    Congress of the U. S., Washington, DC. House Committee on Government Operations.

    This document records the hearing of a Subcommittee of the House on its 3-month investigation of the College Housing Loan Program and the Academic Facilities Loan Program, which are administered by the Department of Education. These programs have awarded about $5 billion in loans to finance the construction of dormitories, dining halls, student…

  18. Florida State Board of Education Administrative Rules for the Operation of Florida's Community/Junior Colleges, Chapter 6A-14. 1982 Edition.

    ERIC Educational Resources Information Center

    Florida State Dept. of Education, Tallahassee.

    Rules of the Florida State Department of Education that govern the administration of the state's community and junior colleges are presented. The rules cover absences, acceleration mechanisms, accounting, accountability, accreditation, admission requirements, adult general education, adult high schools, annual contracts, area served, athletic…

  19. Dynamics of fire ant aggregations

    NASA Astrophysics Data System (ADS)

    Tennenbaum, Michael; Hu, David; Fernandez-Nieves, Alberto

    Fire ant aggregations are an inherently active system. Each ant harvests its own energy and can convert it into motion. The motion of individual ants contributes non-trivially to the bulk material properties of the aggregation. We have measured some of these properties using plate-plate rheology, where the response to an applied external force or deformation is measured. In this talk, we will present data pertaining to the aggregation behavior in the absence of any external force. We quantify the aggregation dynamics by monitoring the rotation of the top plate and by measuring the normal force. We then compare the results with visualizations of 2D aggregations.

  20. Probabilistic prediction models for aggregate quarry siting

    USGS Publications Warehouse

    Robinson, G.R., Jr.; Larkins, P.M.

    2007-01-01

    Weights-of-evidence (WofE) and logistic regression techniques were used in a GIS framework to predict the spatial likelihood (prospectivity) of crushed-stone aggregate quarry development. The joint conditional probability models, based on geology, transportation network, and population density variables, were defined using quarry location and time of development data for the New England States, North Carolina, and South Carolina, USA. The Quarry Operation models describe the distribution of active aggregate quarries, independent of the date of opening. The New Quarry models describe the distribution of aggregate quarries when they open. Because of the small number of new quarries developed in the study areas during the last decade, independent New Quarry models have low parameter estimate reliability. The performance of parameter estimates derived for Quarry Operation models, defined by a larger number of active quarries in the study areas, were tested and evaluated to predict the spatial likelihood of new quarry development. Population density conditions at the time of new quarry development were used to modify the population density variable in the Quarry Operation models to apply to new quarry development sites. The Quarry Operation parameters derived for the New England study area, Carolina study area, and the combined New England and Carolina study areas were all similar in magnitude and relative strength. The Quarry Operation model parameters, using the modified population density variables, were found to be a good predictor of new quarry locations. Both the aggregate industry and the land management community can use the model approach to target areas for more detailed site evaluation for quarry location. The models can be revised easily to reflect actual or anticipated changes in transportation and population features. ?? International Association for Mathematical Geology 2007.

  1. Community Colleges. The Boston Junior College Blues

    ERIC Educational Resources Information Center

    Papke, David Ray

    1975-01-01

    Private junior colleges for women in Boston are suffering from severe financial difficulties. The solutions at three schools, Garland Junior College, Pine Manor Junior College, and Mount Ida Junior College, are presented. (Author/PG)

  2. Houston Community College (HCC)-Mobile Go Center Program

    ERIC Educational Resources Information Center

    Ramirez, Daniel; Sterling, Cheryl; Grays, Shantay R.

    2010-01-01

    The Houston Community College Mobile Go Center brings college enrollment assistance to the doorstep of our community. It operates in a variety of settings, offering college-going material and person-to-person assistance at numerous city events. Services include assistance with academic advising, completing the FAFSA, college application process,…

  3. Antioch College: A Celebrated History and an Uncertain Future

    ERIC Educational Resources Information Center

    Hayford, Elizabeth R.

    2011-01-01

    On June 7, 2007, the Antioch University board of trustees declared that Antioch College, an independent liberal arts college in Yellow Springs, Ohio, was in a state of financial exigency, and, two days later, voted to suspend college operations after the next academic year. After that year, the board oversaw the closing of the college while…

  4. Making Graphene Resist Aggregation

    NASA Astrophysics Data System (ADS)

    Luo, Jiayan

    Graphene-based sheets have stimulated great interest in many scientific disciplines and shown promise for wide potential applications. Among various ways of creating single atomic layer carbon sheets, a promising route for bulk production is to first chemically exfoliate graphite powders to graphene oxide (GO) sheets, followed by reduction to form chemically modified graphene (CMG). Due to the strong van der Waals attraction between graphene sheets, CMG tends to aggregate. The restacking of sheets is largely uncontrollable and irreversible, thus it reduces their processability and compromises properties such as accessible surface area. Strategies based on colloidal chemistry have been applied to keep CMG dispersed in solvents by introducing electrostatic repulsion to overcome the van der Waals attraction or adding spacers to increase the inter-sheet spacing. In this dissertation, two very different ideas that can prevent CMG aggregation without extensively modifying the material or introducing foreign spacer materials are introduced. The van der Waals potential decreases with reduced overlapping area between sheets. For CMG, reducing the lateral dimension from micrometer to nanometer scale should greatly enhance their colloidal stability with additional advantages of increased charge density and decreased probability to interact. The enhanced colloidal stability of GO and CMG nanocolloids makes them especially promising for spectroscopy based bio-sensing applications. For potential applications in a compact bulk solid form, the sheets were converted into paper-ball like structure using capillary compression in evaporating aerosol droplets. The crumpled graphene balls are stabilized by locally folded pi-pi stacked ridges, and do not unfold or collapse during common processing steps. They can tightly pack without greatly reducing the surface area. This form of graphene leads to scalable performance in energy storage. For example, planer sheets tend to aggregate and

  5. Structure of Viral Aggregates

    NASA Astrophysics Data System (ADS)

    Barr, Stephen; Luijten, Erik

    2010-03-01

    The aggregation of virus particles is a particular form of colloidal self-assembly, since viruses of a give type are monodisperse and have identical, anisotropic surface charge distributions. In small-angle X-ray scattering experiments, the Qbeta virus was found to organize in different crystal structures in the presence of divalent salt and non-adsorbing polymer. Since a simple isotropic potential cannot explain the occurrence of all observed phases, we employ computer simulations to investigate how the surface charge distribution affects the virus interactions. Using a detailed model of the virus particle, we find an asymmetric ion distribution around the virus which gives rise to the different phases observed.

  6. Distance and Intrastate College Student Migration

    ERIC Educational Resources Information Center

    Alm, James; Winters, John V.

    2009-01-01

    Most studies of student migration focus on "interstate" migration of college students, largely because the aggregate data typically used are limited in geographic specificity to states. However, interstate migration is only a small part of the total student migration. Public institutions generally get most of their students from within their…

  7. Navigating College

    ERIC Educational Resources Information Center

    Arum, Richard

    2016-01-01

    Students moving from high school to college in the United States typically confront a bewildering set of largely unstructured options. In the absence of clear signals about how to get the most out of college, they often choose pathways that involve limited academic rigor and engagement. In this article, Richard Arum describes a study that followed…

  8. College Radio.

    ERIC Educational Resources Information Center

    Sauls, Samuel J.

    As with commercial stations, the underlying premise of the college radio station is to serve the community, whether it be the campus community or the community at large, but in unique ways often geared to underserved niches of the population. Much of college radio's charm lies in its unpredictable nature and constant mutations. The stations give…

  9. Taurine and platelet aggregation

    SciTech Connect

    Nauss-Karol, C.; VanderWende, C.; Gaut, Z.N.

    1986-03-01

    Taurine is a putative neurotransmitter or neuromodulator. The endogenous taurine concentration in human platelets, determined by amino acid analysis, is 15 ..mu..M/g. In spite of this high level, taurine is actively accumulated. Uptake is saturable, Na/sup +/ and temperature dependent, and suppressed by metabolic inhibitors, structural analogues, and several classes of centrally active substances. High, medium and low affinity transport processes have been characterized, and the platelet may represent a model system for taurine transport in the CNS. When platelets were incubated with /sup 14/C-taurine for 30 minutes, then resuspended in fresh medium and reincubated for one hour, essentially all of the taurine was retained within the cells. Taurine, at concentrations ranging from 10-1000 ..mu..M, had no effect on platelet aggregation induced by ADP or epinephrine. However, taurine may have a role in platelet aggregation since 35-39% of the taurine taken up by human platelets appears to be secreted during the release reaction induced by low concentrations of either epinephrine or ADP, respectively. This release phenomenon would imply that part of the taurine taken up is stored directly in the dense bodies of the platelet.

  10. Force aggregation using genetic algortihms

    NASA Astrophysics Data System (ADS)

    Shea, Peter J.; Peterson, John; Alexander, Kathleen; Azevedo, Alcino

    2004-01-01

    A surveillance system needs to accurately locate and identify not only single targets, but also groups of targets engaged in a common activity. Most existing tracking systems are capable of tracking individual targets quite accurately; however, they fail to use information related to group behavior in order to improve these estimates. Furthermore, in wide area surveillance situations a military operator is required to sort through hundreds to thousands of individual targets in order to develop an understanding of the situation. Having the ability to collapse the behavior of individual targets into a common, coordinated motion can greatly enhance the productively and situational awareness of the operator. Our long-term approach to solving this problem is to develop an understanding of how to define a group and then to understand the inter-relationships between the various characteristics that describe a group. Then using this information, we will be able to partition the set of target into groups that can be aggregated over the entire military force hierarchy. This goal of this paper is to describe an approach that is based upon genetic algorithms for solving the military force hierarchy problem. This paper will describe the underlying genetic algorithm, scoring function, and some initial results.

  11. Force aggregation using genetic algortihms

    NASA Astrophysics Data System (ADS)

    Shea, Peter J.; Peterson, John; Alexander, Kathleen; Azevedo, Alcino

    2003-12-01

    A surveillance system needs to accurately locate and identify not only single targets, but also groups of targets engaged in a common activity. Most existing tracking systems are capable of tracking individual targets quite accurately; however, they fail to use information related to group behavior in order to improve these estimates. Furthermore, in wide area surveillance situations a military operator is required to sort through hundreds to thousands of individual targets in order to develop an understanding of the situation. Having the ability to collapse the behavior of individual targets into a common, coordinated motion can greatly enhance the productively and situational awareness of the operator. Our long-term approach to solving this problem is to develop an understanding of how to define a group and then to understand the inter-relationships between the various characteristics that describe a group. Then using this information, we will be able to partition the set of target into groups that can be aggregated over the entire military force hierarchy. This goal of this paper is to describe an approach that is based upon genetic algorithms for solving the military force hierarchy problem. This paper will describe the underlying genetic algorithm, scoring function, and some initial results.

  12. Holographic characterization of protein aggregates

    NASA Astrophysics Data System (ADS)

    Wang, Chen; Zhong, Xiao; Ruffner, David; Stutt, Alexandra; Philips, Laura; Ward, Michael; Grier, David

    Holographic characterization directly measures the size distribution of subvisible protein aggregates in suspension and offers insights into their morphology. Based on holographic video microscopy, this analytical technique records and interprets holograms of individual aggregates in protein solutions as they flow down a microfluidic channel, without requiring labeling or other exceptional sample preparation. The hologram of an individual protein aggregate is analyzed in real time with the Lorenz-Mie theory of light scattering to measure that aggregate's size and optical properties. Detecting, counting and characterizing subvisible aggregates proceeds fast enough for time-resolved studies, and lends itself to tracking trends in protein aggregation arising from changing environmental factors. No other analytical technique provides such a wealth of particle-resolved characterization data in situ. Holographic characterization promises accelerated development of therapeutic protein formulations, improved process control during manufacturing, and streamlined quality assurance during storage and at the point of use. Mrsec and MRI program of the NSF, Spheryx Inc.

  13. Aggregation dynamics of rigid polyelectrolytes

    NASA Astrophysics Data System (ADS)

    Tom, Anvy Moly; Rajesh, R.; Vemparala, Satyavani

    2016-01-01

    Similarly charged polyelectrolytes are known to attract each other and aggregate into bundles when the charge density of the polymers exceeds a critical value that depends on the valency of the counterions. The dynamics of aggregation of such rigid polyelectrolytes are studied using large scale molecular dynamics simulations. We find that the morphology of the aggregates depends on the value of the charge density of the polymers. For values close to the critical value, the shape of the aggregates is cylindrical with height equal to the length of a single polyelectrolyte chain. However, for larger values of charge, the linear extent of the aggregates increases as more and more polymers aggregate. In both the cases, we show that the number of aggregates decrease with time as power laws with exponents that are not numerically distinguishable from each other and are independent of charge density of the polymers, valency of the counterions, density, and length of the polyelectrolyte chain. We model the aggregation dynamics using the Smoluchowski coagulation equation with kernels determined from the molecular dynamics simulations and justify the numerically obtained value of the exponent. Our results suggest that once counterions condense, effective interactions between polyelectrolyte chains short-ranged and the aggregation of polyelectrolytes are diffusion-limited.

  14. Factbook on New Mexico Public Two-Year Community Colleges and Vocational Schools, 1979-80.

    ERIC Educational Resources Information Center

    New Mexico State Board of Educational Finance, Santa Fe.

    This six-part factbook describes the history, programs, and financial status of New Mexico's two-year colleges. Part I discusses the legal basis for the colleges and describes the coordination of the five types of two-year institutions operating under state law: constitutional colleges, branch community colleges, district junior colleges,…

  15. PRODUCTION OF CONSTRUCTION AGGREGATES FROM FLUE GAS DESULFURIZATION SLUDGE

    SciTech Connect

    M.M. Wu; D.C. McCoy; R.O. Scandrol; M.L. Fenger; J.A. Withum; R.M. Statnick

    2000-05-01

    The three main conclusions of this report are: (1) The pilot plant successfully demonstrated the continuous, fully-integrated, long-term process operation, including the mixing, pelletizing, and curing steps for aggregate production. The curing vessel, which was designed for the pilot plant test, was operated in a mass flow mode and performed well during pilot plant operation. (2) The pilot plant test demonstrated process flexibility. The same equipment was used to produce lightweight, medium-weight, and road aggregates. The only change was the mix formulation. Aggregates were produced from a variety of mix designs and from FGD sludge with solids concentrations between 45.0% and 56.7% and moisture contents between 55.0% and 43.3%. (3) The pilot plant provided operating data and experience to design and cost a commercial plant, which was not part of the cooperative agreement.

  16. Peptide aggregation in neurodegenerative disease.

    PubMed

    Murphy, Regina M

    2002-01-01

    In the not-so-distant past, insoluble aggregated protein was considered as uninteresting and bothersome as yesterday's trash. More recently, protein aggregates have enjoyed considerable scientific interest, as it has become clear that these aggregates play key roles in many diseases. In this review, we focus attention on three polypeptides: beta-amyloid, prion, and huntingtin, which are linked to three feared neurodegenerative diseases: Alzheimer's, "mad cow," and Huntington's disease, respectively. These proteins lack any significant primary sequence homology, yet their aggregates possess very similar features, specifically, high beta-sheet content, fibrillar morphology, relative insolubility, and protease resistance. Because the aggregates are noncrystalline, secrets of their structure at nanometer resolution are only slowly yielding to X-ray diffraction, solid-state NMR, and other techniques. Besides structure, the aggregates may possess similar pathways of assembly. Two alternative assembly pathways have been proposed: the nucleation-elongation and the template-assisted mode. These two modes may be complementary, not mutually exclusive. Strategies for interfering with aggregation, which may provide novel therapeutic approaches, are under development. The structural similarities between protein aggregates of dissimilar origin suggest that therapeutic strategies successful against one disease may have broad utility in others. PMID:12117755

  17. Topics in Probabilistic Judgment Aggregation

    ERIC Educational Resources Information Center

    Wang, Guanchun

    2011-01-01

    This dissertation is a compilation of several studies that are united by their relevance to probabilistic judgment aggregation. In the face of complex and uncertain events, panels of judges are frequently consulted to provide probabilistic forecasts, and aggregation of such estimates in groups often yield better results than could have been made…

  18. Mineral of the month: aggregates

    USGS Publications Warehouse

    Tepordei, Valentin V.

    2005-01-01

    Natural aggregates, consisting of crushed stone, and sand and gravel, are a major contributor to economic health, and have an amazing variety of uses. Aggregates are among the most abundant mineral resources and are major basic raw materials used by construction, agriculture and other industries that employ complex chemical and metallurgical processes.

  19. Privacy-Preserving Data Aggregation in Two-Tiered Wireless Sensor Networks with Mobile Nodes

    PubMed Central

    Yao, Yonglei; Liu, Jingfa; Xiong, Neal N.

    2014-01-01

    Privacy-preserving data aggregation in wireless sensor networks (WSNs) with mobile nodes is a challenging problem, as an accurate aggregation result should be derived in a privacy-preserving manner, under the condition that nodes are mobile and have no pre-specified keys for cryptographic operations. In this paper, we focus on the SUM aggregation function and propose two privacy-preserving data aggregation protocols for two-tiered sensor networks with mobile nodes: Privacy-preserving Data Aggregation against non-colluded Aggregator and Sink (PDAAS) and Privacy-preserving Data Aggregation against Colluded Aggregator and Sink (PDACAS). Both protocols guarantee that the sink can derive the SUM of all raw sensor data but each sensor's raw data is kept confidential. In PDAAS, two keyed values are used, one shared with the sink and the other shared with the aggregator. PDAAS can protect the privacy of sensed data against external eavesdroppers, compromised sensor nodes, the aggregator or the sink, but fails if the aggregator and the sink collude. In PDACAS, multiple keyed values are used in data perturbation, which are not shared with the aggregator or the sink. PDACAS can protect the privacy of sensor nodes even the aggregator and the sink collude, at the cost of a little more overhead than PDAAS. Thorough analysis and experiments are conducted, which confirm the efficacy and efficiency of both schemes. PMID:25390407

  20. Privacy-preserving data aggregation in two-tiered wireless sensor networks with mobile nodes.

    PubMed

    Yao, Yonglei; Liu, Jingfa; Xiong, Neal N

    2014-01-01

    Privacy-preserving data aggregation in wireless sensor networks (WSNs) with mobile nodes is a challenging problem, as an accurate aggregation result should be derived in a privacy-preserving manner, under the condition that nodes are mobile and have no pre-specified keys for cryptographic operations. In this paper, we focus on the SUM aggregation function and propose two privacy-preserving data aggregation protocols for two-tiered sensor networks with mobile nodes: Privacy-preserving Data Aggregation against non-colluded Aggregator and Sink (PDAAS) and Privacy-preserving Data Aggregation against Colluded Aggregator and Sink (PDACAS). Both protocols guarantee that the sink can derive the SUM of all raw sensor data but each sensor's raw data is kept confidential. In PDAAS, two keyed values are used, one shared with the sink and the other shared with the aggregator. PDAAS can protect the privacy of sensed data against external eavesdroppers, compromised sensor nodes, the aggregator or the sink, but fails if the aggregator and the sink collude. In PDACAS, multiple keyed values are used in data perturbation, which are not shared with the aggregator or the sink. PDACAS can protect the privacy of sensor nodes even the aggregator and the sink collude, at the cost of a little more overhead than PDAAS. Thorough analysis and experiments are conducted, which confirm the efficacy and efficiency of both schemes. PMID:25390407

  1. Mechanics of fire ant aggregations

    NASA Astrophysics Data System (ADS)

    Tennenbaum, Michael; Liu, Zhongyang; Hu, David; Fernandez-Nieves, Alberto

    2016-01-01

    Fire ants link their bodies to form aggregations; these can adopt a variety of structures, they can drip and spread, or withstand applied loads. Here, by using oscillatory rheology, we show that fire ant aggregations are viscoelastic. We find that, at the lowest ant densities probed and in the linear regime, the elastic and viscous moduli are essentially identical over the spanned frequency range, which highlights the absence of a dominant mode of structural relaxation. As ant density increases, the elastic modulus rises, which we interpret by alluding to ant crowding and subsequent jamming. When deformed beyond the linear regime, the aggregation flows, exhibiting shear-thinning behaviour with a stress load that is comparable to the maximum load the aggregation can withstand before individual ants are torn apart. Our findings illustrate the rich, collective mechanical behaviour that can arise in aggregations of active, interacting building blocks.

  2. Mechanics of fire ant aggregations.

    PubMed

    Tennenbaum, Michael; Liu, Zhongyang; Hu, David; Fernandez-Nieves, Alberto

    2016-01-01

    Fire ants link their bodies to form aggregations; these can adopt a variety of structures, they can drip and spread, or withstand applied loads. Here, by using oscillatory rheology, we show that fire ant aggregations are viscoelastic. We find that, at the lowest ant densities probed and in the linear regime, the elastic and viscous moduli are essentially identical over the spanned frequency range, which highlights the absence of a dominant mode of structural relaxation. As ant density increases, the elastic modulus rises, which we interpret by alluding to ant crowding and subsequent jamming. When deformed beyond the linear regime, the aggregation flows, exhibiting shear-thinning behaviour with a stress load that is comparable to the maximum load the aggregation can withstand before individual ants are torn apart. Our findings illustrate the rich, collective mechanical behaviour that can arise in aggregations of active, interacting building blocks. PMID:26501413

  3. Molecular aggregation of humic substances

    USGS Publications Warehouse

    Wershaw, R. L.

    1999-01-01

    Humic substances (HS) form molecular aggregates in solution and on mineral surfaces. Elucidation of the mechanism of formation of these aggregates is important for an understanding of the interactions of HS in soils arid natural waters. The HS are formed mainly by enzymatic depolymerization and oxidation of plant biopolymers. These reactions transform the aromatic and lipid plant components into amphiphilic molecules, that is, molecules that consist of separate hydrophobic (nonpolar) and hydrophilic (polar) parts. The nonpolar parts of the molecules are composed of relatively unaltered segments of plant polymers and the polar parts of carboxylic acid groups. These amphiphiles form membrane-like aggregates on mineral surfaces and micelle-like aggregates in solution. The exterior surfaces of these aggregates are hydrophilic, and the interiors constitute separate hydrophobic liquid-like phases.

  4. Imbibition kinetics of spherical aggregates

    NASA Astrophysics Data System (ADS)

    Hébraud, Pascal; Lootens, Didier; Debacker, Alban

    The imbibition kinetics of a millimeter-sized aggregate of 300 nm diameter colloidal particles by a wetting pure solvent is studied. Three successive regimes are observed : in the first one, the imbibition proceeds by compressing the air inside the aggregate. Then, the solvent stops when the pressure of the compressed air is equal to the Laplace pressure at the meniscus of the wetting solvent in the porous aggregate. The interface is pinned and the aggregate slowly degases, up to a point where the pressure of the entrapped air stops decreasing and is controlled by the Laplace pressure of small bubbles. Depending on the curvature of the bubble, the system may then be in an unstable state. The imbibition then starts again, but with an inner pressure in equilibrium with these bubbles. This last stage leads to the complete infiltration of the aggregate.

  5. Immunogenicity of Therapeutic Protein Aggregates.

    PubMed

    Moussa, Ehab M; Panchal, Jainik P; Moorthy, Balakrishnan S; Blum, Janice S; Joubert, Marisa K; Narhi, Linda O; Topp, Elizabeth M

    2016-02-01

    Therapeutic proteins have a propensity for aggregation during manufacturing, shipping, and storage. The presence of aggregates in protein drug products can induce adverse immune responses in patients that may affect safety and efficacy, and so it is of concern to both manufacturers and regulatory agencies. In this vein, there is a lack of understanding of the physicochemical determinants of immunological responses and a lack of standardized analytical methods to survey the molecular properties of aggregates associated with immune activation. In this review, we provide an overview of the basic immune mechanisms in the context of interactions with protein aggregates. We then critically examine the literature with emphasis on the underlying immune mechanisms as they relate to aggregate properties. Finally, we highlight the gaps in our current understanding of this issue and offer recommendations for future research. PMID:26869409

  6. Dataset of aggregate producers in New Mexico

    USGS Publications Warehouse

    Orris, Greta J.

    2000-01-01

    This report presents data, including latitude and longitude, for aggregate sites in New Mexico that were believed to be active in the period 1997-1999. The data are presented in paper form in Part A of this report and as Microsoft Excel 97 and Data Interchange Format (DIF) files in Part B. The work was undertaken as part of the effort to update information for the National Atlas. This compilation includes data from: the files of U.S. Geological Survey (USGS); company contacts; the New Mexico Bureau of Mines and Mineral Resources, New Mexico Bureau of Mine Inspection, and the Mining and Minerals Division of the New Mexico Energy, Minerals and Natural Resources Department (Hatton and others, 1998); the Bureau of Land Management Information; and direct communications with some of the aggregate operators. Additional information on most of the sites is available in Hatton and others (1998).

  7. Unmarried parents in college.

    PubMed

    Goldrick-Rab, Sara; Sorensen, Kia

    2010-01-01

    Noting that access to higher education has expanded dramatically in the past several decades, Sara Goldrick-Rab and Kia Sorensen focus on how unmarried parents fare once they enter college. Contrary to the expectation that access to college consistently promotes family stability and economic security, the authors argue that deficiencies in current policy lead college attendance to have adverse consequences for some families headed by unmarried parents. Although rates of college attendance have increased substantially among unmarried parents, their college completion rates are low. One explanation is inadequate academic preparation. Another is financial constraints, which can force unmarried students to interrupt their studies or increase their work hours, both of which compromise the quality of their educational experiences and the outcomes for their children. The authors point out that although many public programs offer support to unmarried parents attending college, the support is neither well coordinated nor easily accessed. Over the past three decades, loans have increasingly replaced grants as the most common form of federal and state financial aid. Confusion about what is available leads many low-income students to the two most "straightforward" sources of income--loans and work, both of which involve significant costs and can operate at cross-purposes with public forms of support. Too much work can lead to reductions in public benefits, and earnings do not always replace the lost income. A growing body of experimental evidence shows that providing social, financial, and academic supports to vulnerable community college students can improve achievement and attainment. Contextualized learning programs, for example, have enabled participants not only to move on from basic skills to credit-bearing coursework, but also to complete credits, earn certificates, and make gains on basic skills tests. Another successful initiative provided low-performing students with

  8. Role of Standard Demand Response Signals for Advanced Automated Aggregation

    SciTech Connect

    Lawrence Berkeley National Laboratory; Kiliccote, Sila

    2011-11-18

    Emerging standards such as OpenADR enable Demand Response (DR) Resources to interact directly with Utilities and Independent System Operators to allow their facility automation equipment to respond to a variety of DR signals ranging from day ahead to real time ancillary services. In addition, there are Aggregators in today’s markets who are capable of bringing together collections of aggregated DR assets and selling them to the grid as a single resource. However, in most cases these aggregated resources are not automated and when they are, they typically use proprietary technologies. There is a need for a framework for dealing with aggregated resources that supports the following requirements: • Allows demand-side resources to participate in multiple DR markets ranging from wholesale ancillary services to retail tariffs without being completely committed to a single entity like an Aggregator; • Allow aggregated groups of demand-side resources to be formed in an ad hoc fashion to address specific grid-side issues and support the optimization of the collective response of an aggregated group along a number of different dimensions. This is important in order to taylor the aggregated performance envelope to the needs to of the grid; • Allow aggregated groups to be formed in a hierarchical fashion so that each group can participate in variety of markets from wholesale ancillary services to distribution level retail tariffs. This paper explores the issues of aggregated groups of DR resources as described above especially within the context of emerging smart grid standards and the role they will play in both the management and interaction of various grid-side entities with those resources.

  9. Perspectives on Preference Aggregation.

    PubMed

    Regenwetter, Michel

    2009-07-01

    For centuries, the mathematical aggregation of preferences by groups, organizations, or society itself has received keen interdisciplinary attention. Extensive theoretical work in economics and political science throughout the second half of the 20th century has highlighted the idea that competing notions of rational social choice intrinsically contradict each other. This has led some researchers to consider coherent democratic decision making to be a mathematical impossibility. Recent empirical work in psychology qualifies that view. This nontechnical review sketches a quantitative research paradigm for the behavioral investigation of mathematical social choice rules on real ballots, experimental choices, or attitudinal survey data. The article poses a series of open questions. Some classical work sometimes makes assumptions about voter preferences that are descriptively invalid. Do such technical assumptions lead the theory astray? How can empirical work inform the formulation of meaningful theoretical primitives? Classical "impossibility results" leverage the fact that certain desirable mathematical properties logically cannot hold in all conceivable electorates. Do these properties nonetheless hold true in empirical distributions of preferences? Will future behavioral analyses continue to contradict the expectations of established theory? Under what conditions do competing consensus methods yield identical outcomes and why do they do so? PMID:26158988

  10. Scalable evaluation of platelet aggregation by the degree of blood migration

    NASA Astrophysics Data System (ADS)

    Song, Suk-Heung; Lim, Chae-Seung; Shin, Sehyun

    2013-12-01

    Platelet aggregation plays a key role in vascular thrombosis. Antiplatelet drug therapy is commonly used for the prevention of abnormal platelet aggregation. So, measuring platelet aggregation function is critically important in clinical field. Here, we introduce a scalable evaluation method of platelet aggregation measured with the degree of blood migration through microchannel in a microfluidic chip. Unlike conventional methods that require expertise with system physics to operate devices, our approach is using microfluidics system, which requires only a syringe vacuum. The scalable migration factors, migration distance and touchdown time, are capable of distinguishing various antiplatelet drug effects under microfluidics and would be effective for the quick and easy evaluation of quantitative platelet aggregation.

  11. Secure data aggregation in wireless sensor networks using homomorphic encryption

    NASA Astrophysics Data System (ADS)

    Kumar, Manish; Verma, Shekhar; Lata, Kusum

    2015-04-01

    In a Wireless Sensor Network (WSN), aggregation exploits the correlation between spatially and temporally proximate sensor data to reduce the total data volume to be transmitted to the sink. Mobile agents (MAs) fit into this paradigm, and data can be aggregated and collected by an MA from different sensor nodes using context specific codes. The MA-based data collection suffers due to large size of a typical WSN and is prone to security problems. In this article, homomorphic encryption in a clustered WSN has been proposed for secure and efficient data collection using MAs. The nodes keep encrypted data that are given to an MA for data aggregation tasks. The MA performs all the data aggregation operations upon encrypted data as it migrates between nodes in a tree-like structure in which the nodes are leafs and the cluster head is the root of the tree. It returns and deposits the encrypted aggregated data to the cluster head after traversing through all the intra cluster nodes over a shortest path route. The homomorphic encryption and aggregation processing in encrypted domain makes the data collection process secure. Simulation results confirm the effectiveness of the proposed secure data aggregation mechanism. In addition to security, MA-based mechanism leads to lesser delay and bandwidth requirements.

  12. Celebrating the Community College.

    ERIC Educational Resources Information Center

    Jacobsen, Cindy; Ames, Suzanne; Semet, Betty; Newell, L. Jackson

    2001-01-01

    Profiles four community colleges in celebration of the one hundred-year anniversary of the American Association of Community Colleges. Reports on the oldest community college, Joliet Junior College (Illinois); the newest, Cascadia Community College (Washington); the largest, Miami-Dade Community College (Florida); and the smallest, Deep Springs…

  13. Aggregate breakdown of nanoparticulate titania

    NASA Astrophysics Data System (ADS)

    Venugopal, Navin

    Six nanosized titanium dioxide powders synthesized from a sulfate process were investigated. The targeted end-use of this powder was for a de-NOx catalyst honeycomb monolith. Alteration of synthesis parameters had resulted principally in differences in soluble ion level and specific surface area of the powders. The goal of this investigation was to understand the role of synthesis parameters in the aggregation behavior of these powders. Investigation via scanning electron microscopy of the powders revealed three different aggregation iterations at specific length scales. Secondary and higher order aggregate strength was investigated via oscillatory stress rheometry as a means of simulating shear conditions encountered during extrusion. G' and G'' were measured as a function of the applied oscillatory stress. Oscillatory rheometry indicated a strong variation as a function of the sulfate level of the particles in the viscoelastic yield strengths. Powder yield stresses ranged from 3.0 Pa to 24.0 Pa of oscillatory stress. Compaction curves to 750 MPa found strong similarities in extrapolated yield point of stage I and II compaction for each of the powders (at approximately 500 MPa) suggesting that the variation in sulfate was greatest above the primary aggregate level. Scanning electron microscopy of samples at different states of shear in oscillatory rheometry confirmed the variation in the linear elastic region and the viscous flow regime. A technique of this investigation was to approach aggregation via a novel perspective: aggregates are distinguished as being loose open structures that are highly disordered and stochastic in nature. The methodology used was to investigate the shear stresses required to rupture the various aggregation stages encountered and investigate the attempt to realign the now free-flowing constituents comprising the aggregate into a denser configuration. Mercury porosimetry was utilized to measure the pore size of the compact resulting from

  14. Monosized aggregates -- A new model

    SciTech Connect

    Gopal, M.

    1997-08-01

    For applications requiring colloidal particles, it is desirable that they be monosized to better control the structure and the properties. In a number of systems, the monosized particles come together to form aggregates that are also monosized. A model is presented here to explain the formation of these monosized aggregates. This is of particular importance in the fields of ceramics, catalysis, pigments, pharmacy, photographic emulsions, etc.

  15. Model for amorphous aggregation processes

    NASA Astrophysics Data System (ADS)

    Stranks, Samuel D.; Ecroyd, Heath; van Sluyter, Steven; Waters, Elizabeth J.; Carver, John A.; von Smekal, Lorenz

    2009-11-01

    The amorphous aggregation of proteins is associated with many phenomena, ranging from the formation of protein wine haze to the development of cataract in the eye lens and the precipitation of recombinant proteins during their expression and purification. While much literature exists describing models for linear protein aggregation, such as amyloid fibril formation, there are few reports of models which address amorphous aggregation. Here, we propose a model to describe the amorphous aggregation of proteins which is also more widely applicable to other situations where a similar process occurs, such as in the formation of colloids and nanoclusters. As first applications of the model, we have tested it against experimental turbidimetry data of three proteins relevant to the wine industry and biochemistry, namely, thaumatin, a thaumatinlike protein, and α -lactalbumin. The model is very robust and describes amorphous experimental data to a high degree of accuracy. Details about the aggregation process, such as shape parameters of the aggregates and rate constants, can also be extracted.

  16. Glycation precedes lens crystallin aggregation

    SciTech Connect

    Swamy, M.S.; Perry, R.E.; Abraham, E.C.

    1987-05-01

    Non-enzymatic glycosylation (glycation) seems to have the potential to alter the structure of crystallins and make them susceptible to thiol oxidation leading to disulfide-linked high molecular weight (HMW) aggregate formation. They used streptozotocin diabetic rats during precataract and cataract stages and long-term cell-free glycation of bovine lens crystallins to study the relationship between glycation and lens crystallin aggregation. HMW aggregates and other protein components of the water-soluble (WS) and urea-soluble (US) fractions were separated by molecular sieve high performance liquid chromatography. Glycation was estimated by both (/sup 3/H)NaBH/sub 4/ reduction and phenylboronate agarose affinity chromatography. Levels of total glycated protein (GP) in the US fractions were about 2-fold higher than in the WS fractions and there was a linear increase in GP in both WS and US fractions. This increase was parallelled by a corresponding increase in HMW aggregates. Total GP extracted by the affinity method from the US fraction showed a predominance of HMW aggregates and vice versa. Cell-free glycation studies with bovine crystallins confirmed the results of the animals studies. Increasing glycation caused a corresponding increase in protein insolubilization and the insoluble fraction thus formed also contained more glycated protein. It appears that lens protein glycation, HMW aggregate formation, and protein insolubilization are interrelated.

  17. Modifiers of mutant huntingtin aggregation

    PubMed Central

    Teuling, Eva; Bourgonje, Annika; Veenje, Sven; Thijssen, Karen; de Boer, Jelle; van der Velde, Joeri; Swertz, Morris; Nollen, Ellen

    2011-01-01

    Protein aggregation is a common hallmark of a number of age-related neurodegenerative diseases, including Alzheimer’s, Parkinson’s, and polyglutamine-expansion disorders such as Huntington’s disease, but how aggregation-prone proteins lead to pathology is not known. Using a genome-wide RNAi screen in a C. elegans-model for polyglutamine aggregation, we previously identified 186 genes that suppress aggregation. Using an RNAi screen for human orthologs of these genes, we here present 26 human genes that suppress aggregation of mutant huntingtin in a human cell line. Among these are genes that have not been previously linked to mutant huntingtin aggregation. They include those encoding eukaryotic translation initiation, elongation and translation factors, and genes that have been previously associated with other neurodegenerative diseases, like the ATP-ase family gene 3-like 2 (AFG3L2) and ubiquitin-like modifier activating enzyme 1 (UBA1). Unravelling the role of these genes will broaden our understanding of the pathogenesis of Huntington’s disease. PMID:21915392

  18. Kinetic model for erythrocyte aggregation.

    PubMed

    Bertoluzzo, S M; Bollini, A; Rasia, M; Raynal, A

    1999-01-01

    It is well known that light transmission through blood is the most widely utilized method for the study of erythrocyte aggregation. The curves obtained had been considered empirically as exponential functions. In consequence, the process becomes characterized by an only parameter that varies with all the process factors without discrimination. In the present paper a mathematical model for RBC aggregation process is deduced in accordance with von Smoluchowski's theory about the kinetics of colloidal particles agglomeration. The equation fitted the experimental pattern of the RBC suspension optical transmittance closely and contained two parameters that estimate the most important characteristics of the aggregation process separately, i.e., (1) average size of rouleaux at equilibrium and (2) aggregation rate. The evaluation of the method was assessed by some factors affecting erythrocyte aggregation, such as temperature, plasma dilutions, Dextran 500, Dextran 70 and PVP 360, at different media concentrations, cellular membrane alteration by the alkylating agent TCEA, and decrease of medium osmolarity. Results were interpreted considering the process characteristics estimated by the parameters, and there were also compared with similar studies carried out by other authors with other methods. This analysis allowed us to conclude that the equation proposed is reliable and useful to study erythrocyte aggregation. PMID:10660481

  19. Dye-sensitized solar cell employing zinc oxide aggregates grown in the presence of lithium

    DOEpatents

    Zhang, Qifeng; Cao, Guozhong

    2013-10-15

    Provided are a novel ZnO dye-sensitized solar cell and method of fabricating the same. In one embodiment, deliberately added lithium ions are used to mediate the growth of ZnO aggregates. The use of lithium provides ZnO aggregates that have advantageous microstructure, morphology, crystallinity, and operational characteristics. Employing lithium during aggregate synthesis results in a polydisperse collection of ZnO aggregates favorable for porosity and light scattering. The resulting nanocrystallites forming the aggregates have improved crystallinity and more favorable facets for dye molecule absorption. The lithium synthesis improves the surface stability of ZnO in acidic dyes. The procedures developed and disclosed herein also help ensure the formation of an aggregate film that has a high homogeneity of thickness, a high packing density, a high specific surface area, and good electrical contact between the film and the fluorine-doped tin oxide electrode and among the aggregate particles.

  20. Payroll/Operations Analysis.

    ERIC Educational Resources Information Center

    San Diego Community Coll. District, CA. Research Office.

    Based on the findings of an operations research project undertaken by the San Diego Community College District (SDCCD), this report presents recommendations for improving the organizational structure of SDCCD's payroll/operations department. The report first outlines 15 organizational and operations problems confronting the department as revealed…

  1. College Valuations

    ERIC Educational Resources Information Center

    Rubin, Marc

    2015-01-01

    Using the data published by "Boston" magazine and the New England Board of Higher Education's "2016 Guide to New England Colleges & Universities," Marc Rubin examined higher education institutions (HEIs) prices, defined as tuition and plus fees, as a function of several independent factors including: (1) Percentage of…

  2. Iona College.

    ERIC Educational Resources Information Center

    Breslin, Richard D.

    1984-01-01

    The commitment of a small liberal arts college to academic and administrative computer use and to the computer literacy of its students is described and illustrated. Some of the potential problems are discussed, including faculty burnout, the institution-wide impact of program development, and additional planning needs. (MSE)

  3. College Studying.

    ERIC Educational Resources Information Center

    Nist, Sherrie L.; Simpson, Michele

    2002-01-01

    Notes that many students enter postsecondary institutions unprepared to meet the studying demands placed on them. Examines models and taxonomies that have guided researchers as they have investigated studying. Reviews research factors related to studying at the college level: course characteristics, learner characteristics, and learning…

  4. College Health

    MedlinePlus

    ... pressures related to food, drink, appearance, drugs, and sexual activity. There are steps you can take to stay healthy and safe while you're in college: Eat a balanced diet Get enough sleep Get regular physical activity Maintain your health with checkups and vaccinations If you decide to ...

  5. Crystal aggregation in kidney stones; a polymer aggregation problem?

    NASA Astrophysics Data System (ADS)

    Wesson, J.; Beshensky, A.; Viswanathan, P.; Zachowicz, W.; Kleinman, J.

    2008-03-01

    Kidney stones most frequently form as aggregates of calcium oxalate monohydrate (COM) crystals with organic layers between them, and the organic layers contain principally proteins. The pathway leading to the formation of these crystal aggregates in affected people has not been identified, but stone forming patients are thought to have a defect in the structure or distribution of urinary proteins, which normally protect against stone formation. We have developed two polyelectrolyte models that will induce COM crystal aggregation in vitro, and both are consistent with possible urinary protein compositions. The first model was based on mixing polyanionic and polycationic proteins, in portions such that the combined protein charge is near zero. The second model was based on reducing the charge density on partially charged polyanionic proteins, specifically Tamm-Horsfall protein, the second most abundant protein in urine. Both models demonstrated polymer phase separation at solution conditions where COM crystal aggregation was observed. Correlation with data from other bulk crystallization measurements suggest that the anionic side chains form critical binding interactions with COM surfaces that are necessary along with the phase separation process to induce COM crystal aggregation.

  6. Production of manufactured aggregates from flue gas desulfurization by-products

    SciTech Connect

    Wu, M.M.; McCoy, D.C.; Fenger, M.L.; Scandrol, R.O.; Winschel, R.A.; Withum, J.A.; Statnick, R.M.

    1999-07-01

    CONSOL R and D has developed a disk pelletization process to produce manufactured aggregates from the by-products of various technologies designed to reduce sulfur emissions produced from coal utilization. Aggregates have been produced from the by-products of the Coolside and LIMB sorbent injection, the fluidized-bed combustion (FBC), spray dryer absorption (SDA), and lime and limestone wet flue gas desulfurization (FGD) processes. The aggregates produced meet the general specifications for use as road aggregate in road construction and for use as lightweight aggregate in concrete masonry units. Small field demonstrations with 1200 lb to 5000 lb of manufactured aggregates were conducted using aggregates produced from FBC ash and lime wet FGD sludge in road construction and using aggregates made from SDA ash and lime wet FGD sludge to manufacture concrete blocks. The aggregates for this work were produced with a bench-scale (200--400 lb batch) unit. In 1999, CONSOL R and D constructed and operated a 500 lb/hr integrated, continuous pilot plant. A variety of aggregate products were produced from lime wet FGD sludge. The pilot plant test successfully demonstrated the continuous, integrated operation of the process. The pilot plant demonstration was a major step toward commercialization of manufactured aggregate production from FGD by-products. In this paper, progress made in the production of aggregates from dry FGD (Coolside, LIMB, SDA) and FBC by-products, and lime wet FGD sludge is discussed. The discussion covers bench-scale and pilot plant aggregate production and aggregate field demonstrations.

  7. THE TWO-YEAR COLLEGE IN VIRGINIA.

    ERIC Educational Resources Information Center

    BRUMBAUGH, A.J.

    FOLLOWING A REVIEW OF THE STATUS OF POST-HIGH SCHOOL EDUCATION, A COMMITTEE OF THE HIGHER EDUCATION STUDY COMMISSION RECOMMENDED (1) A STATEWIDE SYSTEM OF COMPREHENSIVE COMMUNITY COLLEGES, COORDINATED WITH OTHER SEGMENTS OF HIGHER EDUCATION, (2) A BOARD OF COMMUNITY COLLEGES AND TECHNICAL EDUCATION, TO OPERATE UNDER THE STATE COUNCIL OF HIGHER…

  8. Community College Exemplary Instructional Programs, Volume III.

    ERIC Educational Resources Information Center

    Fideler, Elizabeth F., Ed.; Bazer, Gerald, Ed.

    Third in an annual series, this volume presents brief descriptions of a number of outstanding community college instructional programs identified by the National Council of Instructional Administrators (NCIA). Each description includes the address and telephone number of the college in which the program operates, and the names of the college…

  9. College Rankings: History, Criticism and Reform

    ERIC Educational Resources Information Center

    Myers, Luke; Robe, Jonathan

    2009-01-01

    Today, college quality rankings in news magazines and guidebooks are a big business with tangible impacts on the operation of higher education institutions. The college rankings published annually by "U.S. News and World Report" ("U.S. News") are so influential that Don Hossler of Indiana University derisively claims that higher education is the…

  10. Entrepreneurship in the Community College: Revenue Diversification.

    ERIC Educational Resources Information Center

    Brightman, Richard W.

    1989-01-01

    Offers guidelines for community colleges wishing to become involved in for-profit ventures as a means of revenue diversification. Explains the differences between for-profit activities related to the college's non-profit mission and those that are not; alternative organizational structures; and common operations (e.g., catering, retail sales, and…

  11. Crisis Management in the Community College

    ERIC Educational Resources Information Center

    Murray, John P.; Kishur, Joseph M., Jr.

    2008-01-01

    This study examined the decision-making processes of community college presidents when confronted with unexpected and major challenges. During the day-to-day operations of community colleges, presidents typically rely on their best judgment when making routine decisions. However, this decision-making process needs to change when the unexpected…

  12. Financing Community Colleges: Threats and Opportunities.

    ERIC Educational Resources Information Center

    Kapraun, E. Daniel; Heard, Don A.

    Today many community colleges are faced with a multitude of financial problems that threaten the stability of their educational and operational programs. These problems include decreases in funding, rising costs, outdated funding formulas, and volatile enrollment patterns. The extent to which individual community college leaders understand these…

  13. Budget and Accounting Manual: California Community Colleges.

    ERIC Educational Resources Information Center

    California Community Colleges, Sacramento. Office of the Chancellor.

    This manual specifies in detail the new budget and accounting system for California Community Colleges, utilizing an activity-centered approach to expenditure reporting which describes real resource requirements, their costs, and relative use in each of the 37 discrete activities comprising community college operations. The system is designed to…

  14. Community Colleges: Competing for Changing Clientele.

    ERIC Educational Resources Information Center

    Terry, John E.

    Population, economic, and technological changes will all affect the ways in which Canadian community colleges operate. The rise in the number of seniors, a slowing birth rate, and the aging of the "baby boomers" have influenced the demographics of college clientele. The dynamics of the global marketplace require a highly educated and skilled human…

  15. An Argument for Providing Developmental Education as Part of the Comprehensive Urban Community College Mission of Hudson County Community College. Special Report 93.04.

    ERIC Educational Resources Information Center

    Fujita, Eleanor

    Historically, Hudson County Community College (HCCC) in New Jersey has included developmental education within its mission. As a result of a major re-evaluation of the College's offerings and operations during 1992, it was recommended that: (1) the college formulate curricula that would serve students who do not progress to college-level study so…

  16. Fractal Aggregates in Tennis Ball Systems

    ERIC Educational Resources Information Center

    Sabin, J.; Bandin, M.; Prieto, G.; Sarmiento, F.

    2009-01-01

    We present a new practical exercise to explain the mechanisms of aggregation of some colloids which are otherwise not easy to understand. We have used tennis balls to simulate, in a visual way, the aggregation of colloids under reaction-limited colloid aggregation (RLCA) and diffusion-limited colloid aggregation (DLCA) regimes. We have used the…

  17. The Community College Theatre Department: An Administrative Point of Reference.

    ERIC Educational Resources Information Center

    Marine, Don

    This paper discusses aspects of faculty, administration, departmental structure, curriculum, and production operations of community college theatre departments in general and of Illinois Central College in particular. It contends that the common and revered tenet of community college institutional philosophy is "community service." The importance…

  18. The Efficacy of Learning Communities at Two Community Colleges.

    ERIC Educational Resources Information Center

    Minkler, James E.

    This study examined learning communities at two community colleges, North Idaho College (NIC) and Spokane Falls Community College (SFCC) (Washington). Recent emphasis on learning outcomes and transforming the curriculum to be more learning centered has often come into direct conflict with operating under tight budget constraints. Learning…

  19. How Virginia's Community Colleges Contribute to Virginia's Economic Future.

    ERIC Educational Resources Information Center

    Virginia Community Coll. System, Richmond.

    The Virginia Community College System (VCCS) operates 23 colleges on 40 campuses throughout Virginia. VCCS educated 63% of all Virginians enrolled as undergraduates in any public college or university in the Commonwealth in fall 2002. VCCS is the major provider of higher education services in economically struggling regions of the state, and…

  20. Planning for the Future at San Joaquin Delta College.

    ERIC Educational Resources Information Center

    San Joaquin Delta Coll., Stockton, CA.

    This planning document provides data on current operations as of January 1994 and goals for the future at San Joaquin Delta College, in California. Section I, presents the context for planning at the college, describing the following major factors shaping the college's future: (1) the population is rapidly expanding; (2) fee increases and…

  1. The Interim Campus. Starting New Community Junior Colleges.

    ERIC Educational Resources Information Center

    Richardson, Richard C., Jr.

    The American Association of Junior Colleges made this study to provide information for those wishing to develop new community junior colleges. A questionnaire was sent to the 250, two-year colleges which have begun operation since 1959. Ninety-one responded. Data was assembled by the method used by new institutions to begin their programs. Major…

  2. Aggregated Recommendation through Random Forests

    PubMed Central

    2014-01-01

    Aggregated recommendation refers to the process of suggesting one kind of items to a group of users. Compared to user-oriented or item-oriented approaches, it is more general and, therefore, more appropriate for cold-start recommendation. In this paper, we propose a random forest approach to create aggregated recommender systems. The approach is used to predict the rating of a group of users to a kind of items. In the preprocessing stage, we merge user, item, and rating information to construct an aggregated decision table, where rating information serves as the decision attribute. We also model the data conversion process corresponding to the new user, new item, and both new problems. In the training stage, a forest is built for the aggregated training set, where each leaf is assigned a distribution of discrete rating. In the testing stage, we present four predicting approaches to compute evaluation values based on the distribution of each tree. Experiments results on the well-known MovieLens dataset show that the aggregated approach maintains an acceptable level of accuracy. PMID:25180204

  3. Aggregated recommendation through random forests.

    PubMed

    Zhang, Heng-Ru; Min, Fan; He, Xu

    2014-01-01

    Aggregated recommendation refers to the process of suggesting one kind of items to a group of users. Compared to user-oriented or item-oriented approaches, it is more general and, therefore, more appropriate for cold-start recommendation. In this paper, we propose a random forest approach to create aggregated recommender systems. The approach is used to predict the rating of a group of users to a kind of items. In the preprocessing stage, we merge user, item, and rating information to construct an aggregated decision table, where rating information serves as the decision attribute. We also model the data conversion process corresponding to the new user, new item, and both new problems. In the training stage, a forest is built for the aggregated training set, where each leaf is assigned a distribution of discrete rating. In the testing stage, we present four predicting approaches to compute evaluation values based on the distribution of each tree. Experiments results on the well-known MovieLens dataset show that the aggregated approach maintains an acceptable level of accuracy. PMID:25180204

  4. The Community College Option

    ERIC Educational Resources Information Center

    Rosenbaum, James E.; Ahearn, Caitlin; Rosenbaum, Janet

    2016-01-01

    Efforts to promote college for all for all has opened college doors to a broad range of students. But college--and career success after college--doesn't have to mean a bachelor's degree. Community college credentials, such as associate's degrees and one-year certificates, can lead to further degrees or jobs that offer more benefits than students…

  5. Evaporation effects in elastocapillary aggregation

    NASA Astrophysics Data System (ADS)

    Vella, Dominic; Hadjittofis, Andreas; Singh, Kiran; Lister, John

    2015-11-01

    We consider the effect of evaporation on the aggregation of a number of elastic objects due to a liquid's surface tension. In particular, we consider an array of spring-block elements in which the gaps between blocks are filled by thin liquid films that evaporate during the course of an experiment. Using lubrication theory to account for the fluid flow within the gaps, we study the dynamics of aggregation. We find that a non-zero evaporation rate causes the elements to aggregate more quickly and, indeed, to contact within finite time. However, we also show that the number of elements within each cluster decreases as the evaporation rate increases. We explain these results quantitatively by comparison with the corresponding two-body problem and discuss their relevance for controlling pattern formation in carbon nanotube forests.

  6. Molecular Aggregation in Disodium Cromoglycate

    NASA Astrophysics Data System (ADS)

    Singh, Gautam; Agra-Kooijman, D.; Collings, P. J.; Kumar, Satyendra

    2012-02-01

    Details of molecular aggregation in the mesophases of the anti-asthmatic drug disodium cromoglycate (DSCG) have been studied using x-ray synchrotron scattering. The results show two reflections, one at wide angles corresponding to π-π stacking (3.32 å) of molecules, and the other at small angles which is perpendicular to the direction of molecular stacking and corresponds to the distance between the molecular aggregates. The latter varies from 35 - 41 å in the nematic (N) phase and 27 -- 32 å in the columnar (M) phase. The temperature evolution of the stack height, positional order correlations in the lateral direction, and orientation order parameter were determined in the N, M, and biphasic regions. The structure of the N and M phases and the nature of the molecular aggregation, together with their dependence on temperature and concentration, will be presented.

  7. Global kinetic analysis of seeded BSA aggregation.

    PubMed

    Sahin, Ziya; Demir, Yusuf Kemal; Kayser, Veysel

    2016-04-30

    Accelerated aggregation studies were conducted around the melting temperature (Tm) to elucidate the kinetics of seeded BSA aggregation. Aggregation was tracked by SEC-HPLC and intrinsic fluorescence spectroscopy. Time evolution of monomer, dimer and soluble aggregate concentrations were globally analysed to reliably deduce mechanistic details pertinent to the process. Results showed that BSA aggregated irreversibly through both sequential monomer addition and aggregate-aggregate interactions. Sequential monomer addition proceeded only via non-native monomers, starting to occur only by 1-2°C below the Tm. Aggregate-aggregate interactions were the dominant mechanism below the Tm due to an initial presence of small aggregates that acted as seeds. Aggregate-aggregate interactions were significant also above the Tm, particularly at later stages of aggregation when sequential monomer addition seemed to cease, leading in some cases to insoluble aggregate formation. The adherence (or non-thereof) of the mechanisms to Arrhenius kinetics were discussed alongside possible implications of seeding for biopharmaceutical shelf-life and spectroscopic data interpretation, the latter of which was found to often be overlooked in BSA aggregation studies. PMID:26970282

  8. Assessing the operating efficiencies of teaching hospitals by an enhancement of the AHA/AAMC method. American Hospital Association/Association of American Medical Colleges.

    PubMed

    Morey, R C; Retzlaff-Roberts, D L; Fine, D J; Loree, S W

    2000-01-01

    In the ongoing effort to control costs, comparisons among hospitals' efficiency levels, if valid, can help identify "best practices" across institutions and uncover situations that need corrective intervention. The authors present an extension of the "adjusted cost per equivalent discharge" approach, which incorporates case-mix-severity differences, regional labor cost differentials, and inpatient/outpatient mix, but does not take into account such factors as the differences in hospital sizes, extents of the teaching mission, or quality of care delivered. The alternative approach yields information that suggests where an institution's total operating costs might be reduced with no change in any of the hospital's outputs or operating environment, through comparison with a "peer group" of other hospitals, matched according to the subject hospital's number of beds, the quality of care the hospital delivers, the extent of medical education carried out, the level of case-mix-adjusted discharges, and outpatient activities. A difficulty with this approach (as with others) is that measurement of some of the additional facets (e.g., quality of care) is still evolving, so its main contribution at this time is to provide a construct and method capable of incorporating these important added considerations. Hospital rankings achieved by applying the current and alternative approaches to a real set of teaching hospitals operating in FY 1987 are compared. While the rankings produced by the two approaches are loosely similar, the authors show that some significant differences do appear and can be at least partially explained by the incorporation of the additional factors mentioned above. PMID:10667873

  9. Reducing Router Forwarding Table Size Using Aggregation and Caching

    ERIC Educational Resources Information Center

    Liu, Yaoqing

    2013-01-01

    The fast growth of global routing table size has been causing concerns that the Forwarding Information Base (FIB) will not be able to fit in existing routers' expensive line-card memory, and upgrades will lead to a higher cost for network operators and customers. FIB Aggregation, a technique that merges multiple FIB entries into one, is probably…

  10. Effects of field variables on infield biomass bales aggregation strategies

    Technology Transfer Automated Retrieval System (TEKTRAN)

    Infield aggregation of bales, an essential logistics operation of clearing the field for subsequent cropping, is influenced by several field variables, such as field shape, area, randomness on bale layout, biomass yield per unit area, bale row spacing, number of bales handled simultaneously, collect...

  11. Testing College-Level Critical Thinking.

    ERIC Educational Resources Information Center

    Facione, Peter A.

    1986-01-01

    At the college level, the obstacles to machine-testing of critical thinking are more pedagogical and practical than theoretical and include creating an operational definition, differentiating critical thinking skills and subskills, and establishing test reliability and validity. (MSE)

  12. 75 FR 32919 - Intent To Prepare an Environmental Impact Statement for Northwest Aggregates' Previously...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-06-10

    ...The U.S. Army Corps of Engineers (Corps) Seattle District is preparing an Environmental Impact Statement (EIS) to analyze the environmental effects of replacing an existing barge loading dock to facilitate resumption of sand and gravel mining operations at Northwest Aggregates' Maury Island facility. The Corps issued a permit to Northwest Aggregates for the dock replacement project on July 2,......

  13. Sugeno Fuzzy Integral as a Basis for the Interpretation of Flexible Queries Involving Monotonic Aggregates.

    ERIC Educational Resources Information Center

    Bosc, P.; Lietard, L.; Pivert, O.

    2003-01-01

    Considers flexible querying of relational databases. Highlights include SQL languages and basic aggregate operators; Sugeno's fuzzy integral; evaluation examples; and how and under what conditions other aggregate functions could be applied to fuzzy sets in a flexible query. (Author/LRW)

  14. College Students with ADHD

    MedlinePlus

    ... Families Guide Skip breadcrumb navigation College Students with ADHD Quick Links Facts For Families Guide Facts For ... No. 111; Updated December 2013 Many students with Attention Deficit Hyperactivity Disorder (ADHD) attend college. College students with ADHD face ...

  15. College and University Apartment Housing.

    ERIC Educational Resources Information Center

    Casey-Powell, Deborah, Ed.

    The purpose of this book is to update housing professionals on the current issues and future trends facing college and university apartment operations in the 21st century. Its chapters are: (1) "The History of Apartment Housing" (Rena Buchan); (2) "Research in Apartment Housing" (Donald Whalen); (3) "Community Services and Programming: A Search…

  16. Who Killed These Four Colleges?

    ERIC Educational Resources Information Center

    Healy, Rose M.; Peterson, Vance T.

    1977-01-01

    The final chapter of a study of the failure of four small private colleges implicates their trustees. Trustees were found to have had inadequate participation in planning and operational realities, the consequence in part, of a lack of critical information. (LBH)

  17. Review of Junior College Finance.

    ERIC Educational Resources Information Center

    California State Coordinating Council for Higher Education, Sacramento.

    This report updates the January 1967 study of California junior college financing, considering particularly the possibility of the state assuming all operating costs of the system. Using data not available for the earlier study, it is also examines certain new areas. Section I contains the introduction, a summary, and 12 overall recommendations.…

  18. Mesoscale Simulation of Asphaltene Aggregation.

    PubMed

    Wang, Jiang; Ferguson, Andrew L

    2016-08-18

    Asphaltenes constitute a heavy aromatic crude oil fraction with a propensity to aggregate and precipitate out of solution during petroleum processing. Aggregation is thought to proceed according to the Yen-Mullins hierarchy, but the molecular mechanisms underlying mesoscopic assembly remain poorly understood. By combining coarse-grained molecular models parametrized using all-atom data with high-performance GPU hardware, we have performed molecular dynamics simulations of the aggregation of hundreds of asphaltenes over microsecond time scales. Our simulations reveal a hierarchical self-assembly mechanism consistent with the Yen-Mullins model, but the details are sensitive and depend on asphaltene chemistry and environment. At low concentrations asphaltenes exist predominantly as dispersed monomers. Upon increasing concentration, we first observe parallel stacking into 1D rod-like nanoaggregates, followed by the formation of clusters of nanoaggregates associated by offset, T-shaped, and edge-edge stacking. Asphaltenes possessing long aliphatic side chains cannot form nanoaggregate clusters due to steric repulsions between their aliphatic coronae. At very high concentrations, we observe a porous percolating network of rod-like nanoaggregates suspended in a sea of interpenetrating aliphatic side chains with a fractal dimension of ∼2. The lifetime of the rod-like aggregates is described by an exponential distribution reflecting a dynamic equilibrium between coagulation and fragmentation. PMID:27455391

  19. RAGG - R EPISODIC AGGREGATION PACKAGE

    EPA Science Inventory

    The RAGG package is an R implementation of the CMAQ episodic model aggregation method developed by Constella Group and the Environmental Protection Agency. RAGG is a tool to provide climatological seasonal and annual deposition of sulphur and nitrogen for multimedia management. ...

  20. An Aggregation Advisor for Ligand Discovery.

    PubMed

    Irwin, John J; Duan, Da; Torosyan, Hayarpi; Doak, Allison K; Ziebart, Kristin T; Sterling, Teague; Tumanian, Gurgen; Shoichet, Brian K

    2015-09-10

    Colloidal aggregation of organic molecules is the dominant mechanism for artifactual inhibition of proteins, and controls against it are widely deployed. Notwithstanding an increasingly detailed understanding of this phenomenon, a method to reliably predict aggregation has remained elusive. Correspondingly, active molecules that act via aggregation continue to be found in early discovery campaigns and remain common in the literature. Over the past decade, over 12 thousand aggregating organic molecules have been identified, potentially enabling a precedent-based approach to match known aggregators with new molecules that may be expected to aggregate and lead to artifacts. We investigate an approach that uses lipophilicity, affinity, and similarity to known aggregators to advise on the likelihood that a candidate compound is an aggregator. In prospective experimental testing, five of seven new molecules with Tanimoto coefficients (Tc's) between 0.95 and 0.99 to known aggregators aggregated at relevant concentrations. Ten of 19 with Tc's between 0.94 and 0.90 and three of seven with Tc's between 0.89 and 0.85 also aggregated. Another three of the predicted compounds aggregated at higher concentrations. This method finds that 61 827 or 5.1% of the ligands acting in the 0.1 to 10 μM range in the medicinal chemistry literature are at least 85% similar to a known aggregator with these physical properties and may aggregate at relevant concentrations. Intriguingly, only 0.73% of all drug-like commercially available compounds resemble the known aggregators, suggesting that colloidal aggregators are enriched in the literature. As a percentage of the literature, aggregator-like compounds have increased 9-fold since 1995, partly reflecting the advent of high-throughput and virtual screens against molecular targets. Emerging from this study is an aggregator advisor database and tool ( http://advisor.bkslab.org ), free to the community, that may help distinguish between

  1. FULL-TIME EQUIVALENT OPERATING COSTS.

    ERIC Educational Resources Information Center

    Virginia State Dept. of Community Colleges, Richmond.

    CONCLUSIONS IN THREE AREAS WERE DERIVED FROM TABULAR PRESENTATIONS OF UNIT COST DATA FROM COLORADO, DELAWARE, GEORGIA, ILLINOIS, NORTH CAROLINA, OKLAHOMA, AND OREGON--(1) SMALL COLLEGES COST MORE TO OPERATE THAN LARGER COLLEGES. COSTS INCREASE AS MORE STUDENTS ENROLL IN A COLLEGE BUT NOT IN PROPORTION TO THE ENROLLMENT. (2) VOCATIONAL AND…

  2. Review of the Mississippi Community College Foundation. Report to the Mississippi Legislature.

    ERIC Educational Resources Information Center

    Mississippi State Legislature, Jackson. Performance Evaluation and Expenditure Review Committee.

    The Mississippi Community College Foundation (MCCF) was established in 1986 by the 15 presidents of the state's community and junior colleges to identify opportunities for development in the colleges, receiving public funds from assessments on the colleges to conduct operations. In fall 1994, 6 of the 15 presidents resigned from the MCCF in the…

  3. The Chicago City-Wide Institute of the City Colleges of Chicago.

    ERIC Educational Resources Information Center

    Chicago City Colleges, IL. Chicago City-Wide Inst.

    This document describes the Chicago City-Wide Institute, a non-campus college established in 1974 as the ninth administrative unit of the City Colleges of Chicago. The basic mission of the Institute is to develop and operate programs at the college level for adults who cannot or choose not to go to a traditional college campus. The Institute also…

  4. COMMUNITY SERVICES OF THE COMMUNITY COLLEGES IN THE STATE OF PENNSYLVANIA.

    ERIC Educational Resources Information Center

    MORTON, PAUL W.

    THIS STUDY (1) IDENTIFIES MAJOR COLLEGE COMMUNITY SERVICES, (2) DEFINES THE AREA SERVED BY A COMMUNITY COLLEGE, AND (3) MAKES RECOMMENDATIONS FOR INITIATING AND OPERATING THESE SERVICES IN PENNSYLVANIA COLLEGES. DATA FROM INTERVIEWS WERE USED TO DESIGN A QUESTIONNAIRE SENT TO 90 PUBLIC 2-YEAR COLLEGES ACROSS THE NATION. TABLES DISPLAY THE REPLIES,…

  5. Frequency Factors in a Landscape Model of Filamentous Protein Aggregation

    NASA Astrophysics Data System (ADS)

    Buell, Alexander K.; Jamie R. Blundell; Dobson, Christopher M.; Welland, Mark E.; Terentjev, Eugene M.; Knowles, Tuomas P. J.

    2010-06-01

    Using quantitative measurements of protein aggregation rates, we develop a kinetic picture of protein conversion from a soluble to a fibrillar state which shows that a single free energy barrier to aggregation controls the addition of protein molecules into amyloid fibrils, while the characteristic sublinear concentration dependence emerges as a natural consequence of finite diffusion times. These findings suggest that this reaction does not follow a simple chemical mechanism, but rather operates in a way analogous to the landscape models of protein folding defined by stochastic dynamics on a characteristic energy surface.

  6. 1890 Land-Grant Colleges Facilities. Hearing Before the Subcommittee on Department Operations, Research, and Foreign Agriculture of the Committee on Agriculture, House of Representatives, Ninety-Seventh Congress, First Session on H.R. 1309.

    ERIC Educational Resources Information Center

    Congress of the U.S., Washington, DC. House Committee on Agriculture.

    The Committee on Agriculture hearing in the U.S. House of Representatives on H.R. 1309, which pertains to land-grant colleges and research facilities, including the text of the bill and witness statements, are presented. The bill would provide grants to the 1890 land-grant colleges, including Tuskegee Institute, for the purpose of assisting these…

  7. Assessment of Meeting Employer Needs and the Labor Market Experience of Job Upgrading and Retraining Students in Washington Community Colleges. A Baseline Report. Operations Report No. 91-3.

    ERIC Educational Resources Information Center

    Seppanen, Loretta

    In 1991, the Washington State Board for Community College Education conducted a study to determine the strengths and shortcomings of Washington community colleges' efforts to provide upgrading and retraining for employed workers. Data were derived from four separate studies conducted in 1990, including a survey of 1,151 employed students at eight…

  8. The Community College-High School Connection. Articulated Programs at San Juan College.

    ERIC Educational Resources Information Center

    Black, Marjorie

    San Juan College in Farmington, New Mexico, has developed articulated programs with the four school districts of San Juan County. Designated an Area Vocational School (AVS) in 1969, the college has successfully operated 10 programs for secondary students. The students enrolled in these programs learn in the same facilities and share equipment with…

  9. Leadership Qualities Desired for College Presidents as Perceived by College Trustees

    ERIC Educational Resources Information Center

    Para, Diane J.

    2010-01-01

    The purpose of this study was to identify presidential leadership styles and behaviors that selected college trustee chairs (private institutions) and college council chairs (state-operated institutions) perceived to be most relevant and important for presidential effectiveness and success in leading higher education institutions. Second, it was…

  10. Influence of Subslab Aggregate Permeability of SSV Performance

    SciTech Connect

    Gadgil, A.J.; Bonnefous, Y.C.; Fisk, W.J.; Prill, R.J.; Nematollahi, A.

    1991-09-01

    The effectiveness of the technique of subslab ventilation (SSV) for limiting radon entry into basements was investigated through complementary experimentation and numerical modeling. Determination of the impact of subslab aggregate permeability on SSV performance was a primary objective. Subslab pressure fields resulting from SSV were measured in six well-characterized basements, each with a different combination of soil and aggregate permeability. The relationship between air velocity and pressure gradient within the three types of aggregate installed beneath the basement slabs was measured in the laboratory. A new numerical model of SSV was developed and verified with the field data. This model simulates non-Darcy flow in the aggregate. We demonstrate that non-Darcy effects significantly impact SSV performance. Field data and numerical simulations indicate that increasing the aggregate permeability within the investigated range of 2 x 10{sup -8} m{sup 2} to 3 x 10{sup -7} m{sup 2} substantially improves the extension of the subslab pressure field due to SSV operation. Subslab pressure field extension also improves as soil permeability decreases between 10{sup -9} m{sup 2} and 10{sup -10} m{sup 2}. With a slab-wall gap thickness of 1 mm and the range of aggregate permeability investigated, further reductions in soil permeability do not significantly improve the subslab pressure field extension. Sealing of cracks in the slab and excavation of a small pit where the SSV pipe penetrates the slab also dramatically improve this pressure field extension. A large ratio of aggregate permeability to soil permeability reduces the need for large depressurizations at the SSV pit. Our findings are consistent with the results of prior field studies; however, our understanding of SSV is improved and the dependence of SSV performance on the relevant parameters can now be quantified with the model.

  11. Aggregation of metallochlorophylls - Examination by spectroscopy

    NASA Technical Reports Server (NTRS)

    Boucher, L. J.; Katz, J. J.

    1969-01-01

    Nuclear magnetic resonance measurements determine which metallochlorophylls, besides magnesium-containing chlorophylls, possess coordination aggregation properties. Infrared spectroscopy reveals that only zinc pheophytin and zinc methyl pheophorbide showed significant coordination aggregation, whereas divalent nickel and copper did not.

  12. Oligomeric baroeffect and gas aggregation states

    NASA Technical Reports Server (NTRS)

    Noever, David A.

    1992-01-01

    The baroeffect is analyzed to include a gas that aggregates into higher-order polymers or oligomers. The resulting pressure change is found to vary independently of the molecular weight of the gas components and to depend only on the aggregation or oligomeric order of the gas. With increasing aggregation, diffusive slip velocities are found to increase. The calculations are extended to include general counterdiffusion of two distinct aggregation states (k-, j-mer) for the gas, and the pressure change is derived as a function that is independent of both molecular weight and the absolute aggregation. The only parameter that determines the baroeffect is the ratio of aggregated states, beta = k/j. For gases that reversibly aggregate, possible oscillatory behavior and complex dynamics for pressure are discussed. Gas aggregation may play a role for low-temperature crystal-growth conditions in which vapor concentrations of one (or more) species are high.

  13. Protein aggregation in salt solutions

    PubMed Central

    Kastelic, Miha; Kalyuzhnyi, Yurij V.; Hribar-Lee, Barbara; Dill, Ken A.; Vlachy, Vojko

    2015-01-01

    Protein aggregation is broadly important in diseases and in formulations of biological drugs. Here, we develop a theoretical model for reversible protein–protein aggregation in salt solutions. We treat proteins as hard spheres having square-well-energy binding sites, using Wertheim’s thermodynamic perturbation theory. The necessary condition required for such modeling to be realistic is that proteins in solution during the experiment remain in their compact form. Within this limitation our model gives accurate liquid–liquid coexistence curves for lysozyme and γ IIIa-crystallin solutions in respective buffers. It provides good fits to the cloud-point curves of lysozyme in buffer–salt mixtures as a function of the type and concentration of salt. It than predicts full coexistence curves, osmotic compressibilities, and second virial coefficients under such conditions. This treatment may also be relevant to protein crystallization. PMID:25964322

  14. Aggregated Authentication (AMAC) Using Universal Hash Functions

    NASA Astrophysics Data System (ADS)

    Znaidi, Wassim; Minier, Marine; Lauradoux, Cédric

    Aggregation is a very important issue to reduce the energy consumption in Wireless Sensors Networks (WSNs). There is currently a lack of cryptographic primitives for authentication of aggregated data. The theoretical background for Aggregated Message Authentication Codes (AMACs) has been proposed by Chan and Castelluccia at ISIT 08.

  15. Mineral resource of the month: aggregates

    USGS Publications Warehouse

    Willett, Jason C.

    2012-01-01

    Crushed stone and construction sand and gravel, the two major types of natural aggregates, are among the most abundant and accessible natural resources on the planet. The earliest civilizations used aggregates for various purposes, mainly construction. Today aggregates provide the basic raw materials for the foundation of modern society.

  16. 28 CFR 2.5 - Sentence aggregation.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 28 Judicial Administration 1 2010-07-01 2010-07-01 false Sentence aggregation. 2.5 Section 2.5 Judicial Administration DEPARTMENT OF JUSTICE PAROLE, RELEASE, SUPERVISION AND RECOMMITMENT OF PRISONERS... aggregation. When multiple sentences are aggregated by the Bureau of Prisons pursuant to 18 U.S.C. 4161...

  17. ACT and College Success

    ERIC Educational Resources Information Center

    Bleyaert, Barbara

    2010-01-01

    What is the relationship between ACT scores and success in college? For decades, admissions policies in colleges and universities across the country have required applicants to submit scores from a college entrance exam, most typically the ACT (American College Testing) or SAT (Scholastic Aptitude Test). This requirement suggests that high school…

  18. College Students Helping America

    ERIC Educational Resources Information Center

    Dote, Lillian; Cramer, Kevin; Dietz, Nathan; Grimm, Robert, Jr.

    2006-01-01

    To identify key trends in college student volunteering and to understand their implications for growing volunteering among college students, the Corporation has produced a new report, titled "College Students Helping America," the most comprehensive national report ever conducted on college student volunteering in the United States. The report…

  19. Surviving Math, Surviving College

    ERIC Educational Resources Information Center

    Schaffhauser, Dian

    2009-01-01

    According to a 2000 community college study by Miami Dade College (FL) President Emeritus Robert McCabe, 41 percent of students entering community colleges are underprepared in at least one basic skill area. A three-year study of community college students, published in 2009 by the National Center for Education Statistics, reported that 41 percent…

  20. Beacon College Project Directory.

    ERIC Educational Resources Information Center

    Barnett, Lynn, Ed.

    The American Association of Community Colleges' Beacon College Project (BCP) uses funds from the Kellogg Foundation to award two-year grants to "Beacon" community colleges to form consortia with at least five associate colleges, designed to improve a specific aspect of institutional life. A total of 26 projects, many involving community…

  1. Quality Assurance in Colleges.

    ERIC Educational Resources Information Center

    Dixon, Stella

    This document analyzes the inspection reports of the five further education (FE) colleges in Britain that have achieved a grade of 1 for quality assurance (QA), identifies key lessons for the improvement of programs in other FE colleges, and refers to helpful FE publications. The five colleges consisted of two general FE colleges, one sixth-form…

  2. Small Colleges, Big Missions.

    ERIC Educational Resources Information Center

    Griffin, W. A., Jr., Ed.

    This monograph by the members of the American Association of Community Colleges' Commission on Small and/or Rural Community Colleges shares small and rural community college experiences. In "Leaders through Community Service," Jacqueline D. Taylor provides a model for how small and rural community colleges can be involved in building leaders…

  3. Financing of Tribal Colleges.

    ERIC Educational Resources Information Center

    O'Laughlin, Jeanie

    In addition to higher education programs, tribal colleges offer welfare-to-work programs, adult education, vocational and agricultural training, and childcare, which makes their costs higher than those of conventional colleges. Most tribal colleges are small, resulting in higher than average per student costs. Tribal colleges charge an average of…

  4. College Student Suicide

    ERIC Educational Resources Information Center

    Taub, Deborah J.; Thompson, Jalonda

    2013-01-01

    Suicide is the second-leading cause of death among college students, and it is estimated that 1,088 college students die by suicide each year (National Mental Health Association and the Jed Foundation, 2002). This chapter presents the context of college student mental health within which the problem of college student suicide is situated. Because…

  5. The Future College Executive.

    ERIC Educational Resources Information Center

    Boston Coll., Chestnut Hill, MA.

    This conference report examines various problems facing university administrators and discusses the future role of the executive in American colleges and universities. Conference papers concern the future college executive; efficiency, accountability and the college executive; administrative concerns; and the rights of college administrators. (MJM)

  6. Planning Makes College Possible.

    ERIC Educational Resources Information Center

    Belmont, Jean

    Written by a college financial aid administrator, this booklet is intended to help parents of younger children plan and prepare for the financial aspects of college education. After an introductory chapter, Chapter II lists current and projected (year 2000) costs at the most expensive colleges and at New York City colleges. Chapter III presents…

  7. THE JUNIOR COLLEGE CHAIRMAN.

    ERIC Educational Resources Information Center

    WORTHEN, RICHARD

    THE RAPID DEVELOPMENT OF TWO-YEAR COLLEGES IMPLIES A SHIFT IN THE AMERICAN COLLEGE SCENE AND A RECONSIDERATION OF WHAT A COLLEGE SHOULD DO FOR ITS STUDENTS. "TEN POSTULATES" RELEVANT TO THE CONDUCTING OF A TWO-YEAR COLLEGE ENGLISH DEPARTMENT AND NINE CONCOMITANT RESPONSIBILITIES OF THE DEPARTMENT CHAIRMAN ARE LISTED. A CRITICAL ISSUE RESULTING…

  8. Your College Application.

    ERIC Educational Resources Information Center

    Gelband, Scott; And Others

    A guide to what college-bound students need to know to prepare the most effective college application is presented by three former college admissions officers. Step-by-step strategies are offered to help students take control of the application process and use it to their best advantage. Three basic areas of a college application are examined:…

  9. Cytotoxic effects of aggregated nanomaterials.

    PubMed

    Soto, Karla; Garza, K M; Murr, L E

    2007-05-01

    This study deals with cytotoxicity assays performed on an array of commercially manufactured inorganic nanoparticulate materials, including Ag, TiO(2), Fe(2)O(3), Al(2)O(3), ZrO(2), Si(3)N(4), naturally occurring mineral chrysotile asbestos and carbonaceous nanoparticulate materials such as multiwall carbon nanotube aggregates and black carbon aggregates. The nanomaterials were characterized by TEM, as the primary particles, aggregates or long fiber dimensions ranged from 2nm to 20microm. Cytotoxicological assays of these nanomaterials were performed utilizing a murine alveolar macrophage cell line and human macrophage and epithelial lung cell lines as comparators. The nanoparticulate materials exhibited varying degrees of cytoxicity for all cell lines and the general trends were similar for both the murine and human macrophage cell lines. These findings suggest that representative cytotoxic responses for humans might be obtained by nanoparticulate exposures to simple murine macrophage cell line assays. Moreover, these results illustrate the utility in performing rapid in vitro assays for cytotoxicity assessments of nanoparticulate materials as a general inquiry of potential respiratory health risks in humans. PMID:17275430

  10. Aggregation of Heterogeneously Charged Colloids.

    PubMed

    Dempster, Joshua M; Olvera de la Cruz, Monica

    2016-06-28

    Patchy colloids are attractive as programmable building blocks for metamaterials. Inverse patchy colloids, in which a charged surface is decorated with patches of the opposite charge, are additionally noteworthy as models for heterogeneously charged biological materials such as proteins. We study the phases and aggregation behavior of a single charged patch in an oppositely charged colloid with a single-site model. This single-patch inverse patchy colloid model shows a large number of phases when varying patch size. For large patch sizes we find ferroelectric crystals, while small patch sizes produce cross-linked gels. Intermediate values produce monodisperse clusters and unusual worm structures that preserve finite ratios of area to volume. The polarization observed at large patch sizes is robust under extreme disorder in patch size and shape. We examine phase-temperature dependence and coexistence curves and find that large patch sizes produce polarized liquids, in contrast to mean-field predictions. Finally, we introduce small numbers of unpatched charged colloids. These can either suppress or encourage aggregation depending on their concentration and the size of the patches on the patched colloids. These effects can be exploited to control aggregation and to measure effective patch size. PMID:27253725

  11. An Investigation of Nonverbal Cue Combinations and the Validity of Aggregation Measurement Techniques in a Spontaneous Persuasive Interaction.

    ERIC Educational Resources Information Center

    Buller, David B.

    A study was conducted to examine the presence and composition of nonverbal cues exhibited in a spontaneous dyadic interaction and to investigate the assumption that cue variation is inconsequential to the effect of nonverbal behavior implicit in methods that aggregate cue incidence across interactions. Subjects, 110 college undergraduates, worked…

  12. Aggregation and Aggregate Carbon in a Forested Southeastern Coastal Plain Spodosol

    Technology Transfer Automated Retrieval System (TEKTRAN)

    Soil aggregation is influenced by the soil environment and is a factor in soil carbon sequestration. Sandy Coastal Plain soils often do not have the clay to promote aggregation nor have been considered soils with high levels of aggregation. This study was conducted to examine the aggregate morpholog...

  13. Personal Qualities and College Admissions.

    ERIC Educational Resources Information Center

    Willingham, Warren W.; Breland, Hunter M.

    The extent to which personal and academic factors are important in college admission decisions was studied in 1978, based on data on 25,000 applicants to 9 colleges (Colgate University, Williams College, Ohio Wesleyan University, Kenyon College, Kalamazoo College, Occidental College, Hartwick College, University of Richmond, and Bucknell…

  14. The Twelve College Cost-Quality Study.

    ERIC Educational Resources Information Center

    McKinsey & Co., Inc., Washington, DC.

    Twelve colleges participated in a cost quality study. These colleges were: Allegheny College, Bryn Mawr College, Buchnell University, Carnegie-Mellon University, Chatham College, Dickinson College, Franklin and Marshall College, Gettysburg College, Haverford College, Lafayette College, Lehigh University, and Swarthmore College. The study is an…

  15. [AGGREGATION OF METABOLICALLY DEPLETED HUMAN ERYTHROCYTES].

    PubMed

    Sheremet'ev, Yu A; Popovicheva, A N; Rogozin, M M; Levin, G Ya

    2016-01-01

    An aggregation of erythrocytes in autologous plasma after blood storage for 14 days at 4 °C was studied using photometry and light microscopy. The decrease of ATP content, the formation of echinocytes and spheroechinocytes, the decrease of rouleaux form of erythrocyte aggregation were observed during the storage. On the other hand the aggregates of echinocytes were formed in the stored blood. The addition of plasma from the fresh blood didn't restore the normal discocytic shape and aggregation of erythrocytes in the stored blood. The possible mechanisms of erythrocytes and echinocytes aggregation are discussed. PMID:27220249

  16. [Lysophosphatidic acid and human erythrocyte aggregation].

    PubMed

    Sheremet'ev, Iu A; Popovicheva, A N; Levin, G Ia

    2014-01-01

    The effects of lysophosphatidic acid on the morphology and aggregation of human erythrocytes has been studied. Morphology of erythrocytes and their aggregates were studied by light microscopy. It has been shown that lysophosphatidic acid changes the shape of red blood cells: diskocyte become echinocytes. Aggregation of red blood cells (rouleaux) was significantly reduced in autoplasma. At the same time there is a strong aggregation of echinocytes. This was accompanied by the formation of microvesicles. Adding normal plasma to echinocytes restores shape and aggregation of red blood cells consisting of "rouleaux". A possible mechanism of action of lysophosphatidic acid on erythrocytes is discussed. PMID:25509147

  17. A GIS analysis of suitability for construction aggregate recycling sites using regional transportation network and population density features

    USGS Publications Warehouse

    Robinson, G.R., Jr.; Kapo, K.E.

    2004-01-01

    Aggregate is used in road and building construction to provide bulk, strength, support, and wear resistance. Reclaimed asphalt pavement (RAP) and reclaimed Portland cement concrete (RPCC) are abundant and available sources of recycled aggregate. In this paper, current aggregate production operations in Virginia, Maryland, and the District of Columbia are used to develop spatial association models for the recycled aggregate industry with regional transportation network and population density features. The cost of construction aggregate to the end user is strongly influenced by the cost of transporting processed aggregate from the production site to the construction site. More than 60% of operations recycling aggregate in the mid-Atlantic study area are located within 4.8 km (3 miles) of an interstate highway. Transportation corridors provide both sites of likely road construction where aggregate is used and an efficient means to move both materials and on-site processing equipment back and forth from various work sites to the recycling operations. Urban and developing areas provide a high market demand for aggregate and a ready source of construction debris that may be processed into recycled aggregate. Most aggregate recycling operators in the study area are sited in counties with population densities exceeding 77 people/km2 (200 people/mile 2). No aggregate recycling operations are sited in counties with less than 19 people/km2 (50 people/mile2), reflecting the lack of sufficient long-term sources of construction debris to be used as an aggregate source, as well as the lack of a sufficient market demand for aggregate in most rural areas to locate a recycling operation there or justify the required investment in the equipment to process and produce recycled aggregate. Weights of evidence analyses (WofE), measuring correlation on an area-normalized basis, and weighted logistic regression (WLR), are used to model the distribution of RAP and RPCC operations relative

  18. A Positive Move: 12th Annual College M&O Cost Study

    ERIC Educational Resources Information Center

    Agron, Joe

    2006-01-01

    Colleges placed more of an emphasis on maintenance and operations (M&O) this school year by increasing the amount spent on M&O as a percentage of total budget. According to "American School & University's" 12th annual College Maintenance and Operations Cost Study, spending on M&O as a percentage of total college budget increased to 11 percent from…

  19. COMMERCIAL DEMONSTRATION OF THE MANUFACTURED AGGREGATE PROCESSING TECHNOLOGY UTILIZING SPRAY DRYER ASH

    SciTech Connect

    Roy Scandrol

    2003-04-01

    Universal Aggregates, LLC proposes to design, construct and operate a lightweight aggregate manufacturing plant at the Birchwood Power Facility in King George, Virginia. The installation and start-up expenses for the Birchwood Aggregate Facility are $19.5 million. The DOE share is $7.2 million (37%) and the Universal Aggregates share is $12.3 (63%). The project team consists of CONSOL Energy Inc., P.J. Dick, Inc., SynAggs, LLC, and Universal Aggregates, LLC. The Birchwood Facility will transform 115,000 tons per year of spray dryer by-products that are currently being disposed of in an offsite landfill into 167,000 tons of a useful product, lightweight aggregates that can be used to manufacture lightweight aggregates that can be used to manufacture lightweight and medium weight masonry blocks. In addition to the environmental benefits, the Birchwood Facility will create eight (8) manufacturing jobs plus additional employment in the local trucking industry to deliver the aggregate to customers or reagents to the facility. A successful demonstration would lead to additional lightweight aggregate manufacturing facilities in the United States. There are currently twenty-one (21) spray dryer facilities operating in the United States that produce an adequate amount of spray dryer by-product to economically justify the installation of a lightweight aggregate manufacturing facility. Industry sources believe that as additional scrubbing is required, dry flue gas desulfurization (FGD) technologies will be the technology of choice. Letters from potential lightweight aggregate customers indicate that there is a market for the product once the commercialization barriers are eliminated by this demonstration project.

  20. COMMERCIAL DEMONSTRATION OF THE MANUFACTURED AGGREGATE PROCESSING TECHNOLOGY UTILIZING SPRAY DRYER ASH

    SciTech Connect

    Roy Scandrol

    2003-10-01

    Universal Aggregates, LLC proposes to design, construct and operate a lightweight aggregate manufacturing plant at the Birchwood Power Facility in King George, Virginia. The installation and start-up expenses for the Birchwood Aggregate Facility are $19.5 million. The DOE share is $7.2 million (37%) and the Universal Aggregates share is $12.3 (63%). The project team consists of CONSOL Energy Inc., P.J. Dick, Inc., SynAggs, LLC, and Universal Aggregates, LLC. The Birchwood Facility will transform 115,000 tons per year of spray dryer by-products that are currently being disposed of in an offsite landfill into 167,000 tons of a useful product, lightweight aggregates that can be used to manufacture lightweight aggregates that can be used to manufacture lightweight and medium weight masonry blocks. In addition to the environmental benefits, the Birchwood Facility will create nine (9) manufacturing jobs plus additional employment in the local trucking industry to deliver the aggregate to customers or reagents to the facility. A successful demonstration would lead to additional lightweight aggregate manufacturing facilities in the United States. There are currently twenty-one (21) spray dryer facilities operating in the United States that produce an adequate amount of spray dryer by-product to economically justify the installation of a lightweight aggregate manufacturing facility. Industry sources believe that as additional scrubbing is required, dry FGD technologies will be the technology of choice. Letters from potential lightweight aggregate customers indicate that there is a market for the product once the commercialization barriers are eliminated by this demonstration project.

  1. Microwave extinction characteristics of nanoparticle aggregates

    NASA Astrophysics Data System (ADS)

    Wu, Y. P.; Cheng, J. X.; Liu, X. X.; Wang, H. X.; Zhao, F. T.; Wen, W. W.

    2016-07-01

    Structure of nanoparticle aggregates plays an important role in microwave extinction capacity. The diffusion-limited aggregation model (DLA) for fractal growth is utilized to explore the possible structures of nanoparticle aggregates by computer simulation. Based on the discrete dipole approximation (DDA) method, the microwave extinction performance by different nano-carborundum aggregates is numerically analyzed. The effects of the particle quantity, original diameter, fractal structure, as well as orientation on microwave extinction are investigated, and also the extinction characteristics of aggregates are compared with the spherical nanoparticle in the same volume. Numerical results give out that proper aggregation of nanoparticle is beneficial to microwave extinction capacity, and the microwave extinction cross section by aggregated granules is better than that of the spherical solid one in the same volume.

  2. Simulation of J-aggregate microcavity photoluminescence

    NASA Astrophysics Data System (ADS)

    Michetti, Paolo; La Rocca, Giuseppe C.

    2008-05-01

    We have developed a model in order to account for the photoexcitation dynamics of J-aggregate films and strongly coupled J-aggregate microcavities. The J aggregates are described as a disordered Frenkel exciton system in which relaxation occurs due to the presence of a thermal bath of molecular vibrations. The correspondence between the photophysics in J-aggregate films and that in J-aggregate microcavities is obtained by introducing a model polariton wave function mixing cavity photon modes and J-aggregate super-radiant excitons. With the same description of the material properties, we have calculated both absorption and luminescence spectra for the J-aggregate film and the photoluminescence of strongly coupled organic microcavities. The model is able to account for the fast relaxation dynamics in organic microcavities following nonresonant pumping and explains the temperature dependence of the ratio between the upper polariton and the lower polariton luminescence.

  3. PLANNING AND OPERATING COLLEGE UNION BUILDINGS.

    ERIC Educational Resources Information Center

    BUTTS, PORTER

    THIS MONOGRAPH IS A DISCUSSION OF FOUR ASPECTS OF STUDENT UNIONS. PART ONE DISCUSSES THE NATURE AND PURPOSE OF A UNION AND THE UNION AS A CAMPUS CENTER. PART TWO DEALS WITH THE PLANNING OF UNION BUILDINGS AND GIVES PROCEDURES, PRINCIPLES AND CAUTIONS. UNION FACILITIES AND SERVICES ARE LISTED. PART THREE DISCUSSES THE ORGANIZATION AND ACTIVITIES OF…

  4. Specification aggregate quarry expansion: a case study demonstrating sustainable management of natural aggregate resources

    USGS Publications Warehouse

    Langer, William H.; Tucker, M.L.

    2003-01-01

    Many countries, provinces, territories, or states in the European Union, Australia, Canada, the United States, and elsewhere have begun implementing sustainability programs, but most of those programs stop short of sustainable management of aggregate resources. Sustainable practices do not always have to be conducted under the title of sustainability. This case study describes how Lafarge, a large multinational construction materials supplier, implemented the principles of sustainability even though there was an absence of existing local government policies or procedures addressing sustainable resource management. Jefferson County, Colorado, USA, is one of three counties in the six-county Denver, Colorado, region that has potentially available sources of crushed stone. Crushed stone comprises 30 percent of the aggregate produced in the area and plays a major role in regional aggregate resource needs. Jefferson County is home to four of the five crushed stone operations in the Denver region. Lafarge operates one of those four quarries. Lafarge recently proposed to expand its reserves by exchanging company-owned land for existing dedicated open space land adjacent to their quarry but owned by Jefferson County. A similar proposal submitted about 10 years earlier had been denied. Contrary to the earlier proposal, which was predicated on public relations, the new proposal was predicated on public trust. Although not explicitly managed under the moniker of sustainability, Lafarge used basic management principles that embody the tenets of sustainability. To achieve the goals of sustainable aggregate management where no governmental policies existed, Lafarge not only assumed their role of being a responsible corporate and environmental member of the community, but also assumed the role of facilitator to encourage and enable other stakeholders to responsibly resolve legitimate concerns regarding the Lafarge quarry proposal. Lafarge successfully presented an enlightened

  5. Usefulness of the Co-op Experience: A Study of Community College Students.

    ERIC Educational Resources Information Center

    Krebs, Uwe (Hugh)

    1987-01-01

    Analyzes the perceived usefulness of the co-op experience of community college graduates from the Production and Operating Management and the Marketing Management programs at Centennial College in Ontario. (JOW)

  6. Inhomogeneous diffusion-limited aggregation

    NASA Technical Reports Server (NTRS)

    Selinger, Robin Blumberg; Nittmann, Johann; Stanley, H. E.

    1989-01-01

    It is demonstrated here that inhomogeneous diffusion-limited aggregation (DLA) model can be used to simulate viscous fingering in a medium with inhomogeneous permeability and homogeneous porosity. The medium consists of a pipe-pore square-lattice network in which all pores have equal volume and the pipes have negligible volume. It is shown that fluctuations in a DLA-based growth process may be tuned by noise reduction, and that fluctuations in the velocity of the moving interface are multiplicative in form.

  7. Investigating the mechanisms leading to protein aggregation

    NASA Astrophysics Data System (ADS)

    McNamara, Ruth; McManus, Jennifer J.

    2014-03-01

    The formation of protein aggregates is a feature of several diseases and is a problem during the manufacture of biopharmaceutical and protein based food products. During processing, stability may become compromised leading to the condensation of proteins to form non-native aggregates. The aim of this work is to induce aggregation on model proteins by the imposition of a particular stress to evaluate the extent of aggregation and to assess the degree of structural change to the protein. Aggregation of two proteins, lysozyme and bovine serum albumin has been induced by several mechanisms. Using various techniques (electrophoresis, HPLC, spectroscopic analysis, and microscopic techniques) both the level of aggregation extent of protein unfolding has been investigated for a range of solution conditions. Our results show that the amount of aggregation depends strongly on the mechanism by which non-native aggregation proceeds, and within each mechanism, solution conditions are an important factor. With the exception of aggregation by self-association (which is concentration dependent), the appearance of aggregation is driven by structural changes induced by the applied stress (heat, chemical denaturant, oxidation or contact with a surface). Author would like to acknowledge support from Science Foundation Ireland (SFI), National University of Maynooth John and Pat Hume Scholarship.

  8. A review of volcanic ash aggregation

    NASA Astrophysics Data System (ADS)

    Brown, R. J.; Bonadonna, C.; Durant, A. J.

    2012-01-01

    Most volcanic ash particles with diameters <63 μm settle from eruption clouds as particle aggregates that cumulatively have larger sizes, lower densities, and higher terminal fall velocities than individual constituent particles. Particle aggregation reduces the atmospheric residence time of fine ash, which results in a proportional increase in fine ash fallout within 10-100 s km from the volcano and a reduction in airborne fine ash mass concentrations 1000 s km from the volcano. Aggregate characteristics vary with distance from the volcano: proximal aggregates are typically larger (up to cm size) with concentric structures, while distal aggregates are typically smaller (sub-millimetre size). Particles comprising ash aggregates are bound through hydro-bonds (liquid and ice water) and electrostatic forces, and the rate of particle aggregation correlates with cloud liquid water availability. Eruption source parameters (including initial particle size distribution, erupted mass, eruption column height, cloud water content and temperature) and the eruption plume temperature lapse rate, coupled with the environmental parameters, determines the type and spatiotemporal distribution of aggregates. Field studies, lab experiments and modelling investigations have already provided important insights on the process of particle aggregation. However, new integrated observations that combine remote sensing studies of ash clouds with field measurement and sampling, and lab experiments are required to fill current gaps in knowledge surrounding the theory of ash aggregate formation.

  9. Role of Multicellular Aggregates in Biofilm Formation

    PubMed Central

    Kragh, Kasper N.; Hutchison, Jaime B.; Melaugh, Gavin; Rodesney, Chris; Roberts, Aled E. L.; Irie, Yasuhiko; Jensen, Peter Ø.; Diggle, Stephen P.; Allen, Rosalind J.

    2016-01-01

    ABSTRACT In traditional models of in vitro biofilm development, individual bacterial cells seed a surface, multiply, and mature into multicellular, three-dimensional structures. Much research has been devoted to elucidating the mechanisms governing the initial attachment of single cells to surfaces. However, in natural environments and during infection, bacterial cells tend to clump as multicellular aggregates, and biofilms can also slough off aggregates as a part of the dispersal process. This makes it likely that biofilms are often seeded by aggregates and single cells, yet how these aggregates impact biofilm initiation and development is not known. Here we use a combination of experimental and computational approaches to determine the relative fitness of single cells and preformed aggregates during early development of Pseudomonas aeruginosa biofilms. We find that the relative fitness of aggregates depends markedly on the density of surrounding single cells, i.e., the level of competition for growth resources. When competition between aggregates and single cells is low, an aggregate has a growth disadvantage because the aggregate interior has poor access to growth resources. However, if competition is high, aggregates exhibit higher fitness, because extending vertically above the surface gives cells at the top of aggregates better access to growth resources. Other advantages of seeding by aggregates, such as earlier switching to a biofilm-like phenotype and enhanced resilience toward antibiotics and immune response, may add to this ecological benefit. Our findings suggest that current models of biofilm formation should be reconsidered to incorporate the role of aggregates in biofilm initiation. PMID:27006463

  10. Community Colleges Demand More from Their Buildings.

    ERIC Educational Resources Information Center

    Adams, Matthew C.

    1998-01-01

    Discusses the financial and operational difficulties inherent in community college facilities management. It explains why the primary source of plant operation cost and waste starts with satisfying the scheduling and changing educational needs of its students. Problems in planning and executing major maintenance activities are also addressed. (GR)

  11. Protein aggregates in Huntington's disease.

    PubMed

    Arrasate, Montserrat; Finkbeiner, Steven

    2012-11-01

    Huntington's disease (HD) is an incurable neurodegenerative disease characterized by abnormal motor movements, personality changes, and early death. HD is caused by a mutation in the IT-15 gene that expands abnormally the number of CAG nucleotide repeats. As a result, the translated protein huntingtin contains disease-causing expansions of glutamines (polyQ) that make it prone to misfold and aggregate. While the gene and mutations that cause HD are known, the mechanisms underlying HD pathogenesis are not. Here we will review the state of knowledge of HD, focusing especially on a hallmark pathological feature-intracellular aggregates of mutant Htt called inclusion bodies (IBs). We will describe the role of IBs in the disease. We speculate that IB formation could be just one component of a broader coping response triggered by misfolded Htt whose efficacy may depend on the extent to which it clears toxic forms of mutant Htt. We will describe how IB formation might be regulated and which factors could determine different coping responses in different subsets of neurons. A differential regulation of IB formation as a function of the cellular context could, eventually, explain part of the neuronal vulnerability observed in HD. PMID:22200539

  12. Mesoscale simulation of asphaltene aggregation

    NASA Astrophysics Data System (ADS)

    Wang, Jiang; Ferguson, Andrew

    Asphaltenes constitute a heavy aromatic crude oil fraction that can aggregate and precipitate out of solution. Association is thought to proceed hierarchically according to the Yen-Mullins model, but the molecular mechanisms and pathways remain poorly understood. In this study, we perform molecular dynamics simulations of the aggregation of hundreds of asphaltenes over microseconds using the coarse-grained Martini force field. We identified a hierarchical self-assembly mechanism consistent with Yen-Mullins model, but the details of which are strongly dependent on asphaltene molecular structure. Monomeric asphaltenes first self-assemble into 1-D rod-like nanoaggregates, followed by the formation of clusters of nanoaggregates. At high concentrations, asphaltenes with short aliphatic side chains assemble into a percolating network with the binding of 1-D rods. Conversely, molecules with more and longer side chains cannot efficiently stack, producing a fractal network of 1-D rods suspended in a sea of interpenetrating aliphatic side chains. Our results provide the first molecularly-detailed validation of the full Yen-Mullins hierarchy, and are in good agreement with recent computational and experimental studies. ACS Petroleum Research Fund.

  13. Sectoral shifts and aggregate unemployment

    SciTech Connect

    Loungani, P.

    1986-01-01

    Some recent research has taken the view that sectoral or industry-specific shocks significantly affect aggregate unemployment by increasing the amount of inter-industry labor reallocation required. The empirical evidence for this view rests on the finding that during the 1950s - and again during the 1970s - there was a positive correlation between aggregate unemployment and the dispersion of employment growth rates. This thesis demonstrates that this correlation arises largely because oil price shocks affect both unemployment and the dispersion of employment growth. Once the dispersion due to oil shocks is accounted for, the residual dispersion in employment has very low explanatory power for unemployment. Since the dispersion index does not measure pure sectoral shifts, an alternate measure of dispersion is developed that serves as a better proxy for the amount of inter-industry labor reallocation required each period. Estimates using this measure suggest that, during the 1950s, temporary increases in the relative price of oil were responsible for generating the observed correlation. On the other hand, sectoral shifts were important during the 1970s; in particular, the 1973 oil price increase has had significant reallocative effects on the economy. This contention is subjected to further tests by looking at the time-series behavior of employment in durable-goods industries and also by following the inter-industry movements of workers over time through the use of panel data.

  14. Attracted diffusion-limited aggregation.

    PubMed

    Rahbari, S H Ebrahimnazhad; Saberi, A A

    2012-07-01

    In this paper we present results of extensive Monte Carlo simulations of diffusion-limited aggregation (DLA) with a seed placed on an attractive plane as a simple model in connection with the electrical double layers. We compute the fractal dimension of the aggregated patterns as a function of the attraction strength α. For the patterns grown in both two and three dimensions, the fractal dimension shows a significant dependence on the attraction strength for small values of α and approaches that of the ordinary two-dimensional (2D) DLA in the limit of large α. For the nonattracting case with α = 1, our results in three dimensions reproduce the patterns of 3D ordinary DLA, while in two dimensions our model leads to the formation of a compact cluster with dimension 2. For intermediate α, the 3D clusters have a quasi-2D structure with a fractal dimension very close to that of the ordinary 2D DLA. This allows one to control the morphology of a growing cluster by tuning a single external parameter α. PMID:23005417

  15. Attracted diffusion-limited aggregation

    NASA Astrophysics Data System (ADS)

    Rahbari, S. H. Ebrahimnazhad; Saberi, A. A.

    2012-07-01

    In this paper we present results of extensive Monte Carlo simulations of diffusion-limited aggregation (DLA) with a seed placed on an attractive plane as a simple model in connection with the electrical double layers. We compute the fractal dimension of the aggregated patterns as a function of the attraction strength α. For the patterns grown in both two and three dimensions, the fractal dimension shows a significant dependence on the attraction strength for small values of α and approaches that of the ordinary two-dimensional (2D) DLA in the limit of large α. For the nonattracting case with α=1, our results in three dimensions reproduce the patterns of 3D ordinary DLA, while in two dimensions our model leads to the formation of a compact cluster with dimension 2. For intermediate α, the 3D clusters have a quasi-2D structure with a fractal dimension very close to that of the ordinary 2D DLA. This allows one to control the morphology of a growing cluster by tuning a single external parameter α.

  16. Asphaltene Aggregation and Fouling Behavior

    NASA Astrophysics Data System (ADS)

    Derakhshesh, Marzie

    This thesis explored the properties of asphaltene nano-aggregates in crude oil and toluene based solutions and fouling at process furnace temperatures, and the links between these two phenomena. The link between stability of asphaltenes at ambient conditions and fouling at the conditions of a delayed coker furnace, at over 450 °C, was examined by blending crude oil with an aliphatic diluent in different ratios. The stability of the blends were measured using a S-value analyzer, then fouling rates were measured on electrically heated stainless steel 316 wires in an autoclave reactor. The less stable the blend, the greater the rate and extent of fouling. The most severe fouling occurred with the unstable asphaltenes. SEM imaging of the foulant illustrates very different textures, with the structure becoming more porous with lower stability. Under cross-polarized light, the coke shows the presence of mesophase in the foulant layer. These data suggest a correlation between the fouling rate at high temperature furnace conditions and the stability index of the crude oil. Three organic polysulfides were introduced to the crude oil to examine their effect on fouling. The polysulfides are able to reduce coking and carbon monoxide generation in steam crackers. The fouling results demonstrated that polysulfide with more sulfur content increased the amount of corrosion-fouling of the wire. Various additives, solvents, ultrasound, and heat were employed to attempt to completely disaggregate the asphaltene nano-aggregates in solution at room temperature. The primary analytical technique used to monitor the nano-aggregation state of the asphaltenes in solution was the UV-visible spectroscopy. The results indicate that stronger solvents, such as pyridine and quinoline, combined with ionic liquids yield a slight reduction in the apparent absorbance at longer wavelengths, indicative of a decrease in the nano-aggregate size although the magnitude of the decrease is not significant

  17. Natural aggregates of the conterminous United States

    USGS Publications Warehouse

    Langer, William H.

    1988-01-01

    Crushed stone and sand and gravel are the two main sources of natural aggregates. These materials are commonly used construction materials and frequently can be interchanged with one another. They are widely used throughout the United States, with every State except two producing crushed stone. Together they amount to about half the mining volume in the United States. Approximately 96 percent of sand and gravel and 77 percent of the crushed stone produced in the United States are used in the construction industry. Natural aggregates are widely distributed throughout the United States in a variety of geologic environments. Sand and gravel deposits commonly are the results of the weathering of bedrock and subsequent transportation and deposition of the material by water or ice (glaciers). As such, they commonly occur as river or stream deposits or in glaciated areas as glaciofluvial and other deposits. Crushed stone aggregates are derived from a wide variety of parent bedrock materials. Limestone and other carbonates account for approximately three quarters of the rocks used for crushed stone, with granite and other igneous rocks making up the bulk of the remainder. Limestone deposits are widespread throughout the Central and Eastern United States and are scattered in the West. Granites are widely distributed in the Eastern and Western United States, with few exposures in the Midwest. Igneous rocks (excluding granites) are largely concentrated in the Western United States and in a few isolated localities in the East. Even though natural aggregates are widely distributed throughout the United States, they are not universally available for consumptive use. Some areas are devoid of sand and gravel, and potential sources of crushed stone may be covered with sufficient unconsolidated material to make surface mining impractical. In some areas many aggregates do not meet the physical property requirements for certain uses, or they may contain mineral constituents that react

  18. Multiscale simulation of red blood cell aggregation

    NASA Astrophysics Data System (ADS)

    Bagchi, P.; Popel, A. S.

    2004-11-01

    In humans and other mammals, aggregation of red blood cells (RBC) is a major determinant to blood viscosity in microcirculation under physiological and pathological conditions. Elevated levels of aggregation are often related to cardiovascular diseases, bacterial infection, diabetes, and obesity. Aggregation is a multiscale phenomenon that is governed by the molecular bond formation between adjacent cells, morphological and rheological properties of the cells, and the motion of the extra-cellular fluid in which the cells circulate. We have developed a simulation technique using front tracking methods for multiple fluids that includes the multiscale characteristics of aggregation. We will report the first-ever direct computer simulation of aggregation of deformable cells in shear flows. We will present results on the effect of shear rate, strength of the cross-bridging bonds, and the cell rheological properties on the rolling motion, deformation and subsequent breakage of an aggregate.

  19. Waves and aggregation patterns in myxobacteria

    NASA Astrophysics Data System (ADS)

    Igoshin, Oleg A.; Welch, Roy; Kaiser, Dale; Oster, George

    2004-03-01

    Under starvation conditions, a population of myxobacteria aggregates to build a fruiting body whose shape is species-specific and within which the cells sporulate. Early in this process, cells often pass through a "ripple phase" characterized by traveling linear, concentric, and spiral waves. These waves are different from the waves observed during slime mold aggregation that depend on diffusible morphogens, because myxobacteria communicate by direct contact. The difference is most dramatic when waves collide: rather than annihilating one another, myxobacterial waves appear to pass through one another unchanged. Under certain conditions, the spacing and location of the nascent fruiting bodies is determined by the wavelength and pattern of the waves. Later in fruiting body development, waves are replaced by streams of cells that circulate around small initial aggregates enlarging and rounding them. Still later, pairs of motile aggregates coalesce to form larger aggregates that develop into fruiting bodies. Here we present a mathematical model that quantitatively explains these wave and aggregation phenomena.

  20. A dimension map for molecular aggregates.

    PubMed

    Jian, Cuiying; Tang, Tian; Bhattacharjee, Subir

    2015-05-01

    A pair of gyradius ratios, defined from the principal radii of gyration, are used to generate a dimension map that describes the geometry of molecular aggregates in water and in organic solvents. Molecular dynamics simulations were performed on the aggregation of representative biomolecules and polyaromatic compounds to demonstrate application of the dimension map. It was shown that molecular aggregate data on the dimension map were bounded by two boundary curves, and that the map could be separated into three regions representing three groups of structures: one-dimensional rod-like structures; two-dimensional planar structures or short-cylinder-like structures; and three-dimensional sphere-like structures. Examining the location of the aggregates on the dimension map and how the location changes with solvent type and solute material parameter provides a simple yet effective way to infer the aggregation manner and to study solubility and mechanism of aggregation. PMID:25768393

  1. Sustainability in Supply Chain Management: Aggregate Planning from Sustainability Perspective.

    PubMed

    Türkay, Metin; Saraçoğlu, Öztürk; Arslan, Mehmet Can

    2016-01-01

    Supply chain management that considers the flow of raw materials, products and information has become a focal issue in modern manufacturing and service systems. Supply chain management requires effective use of assets and information that has far reaching implications beyond satisfaction of customer demand, flow of goods, services or capital. Aggregate planning, a fundamental decision model in supply chain management, refers to the determination of production, inventory, capacity and labor usage levels in the medium term. Traditionally standard mathematical programming formulation is used to devise the aggregate plan so as to minimize the total cost of operations. However, this formulation is purely an economic model that does not include sustainability considerations. In this study, we revise the standard aggregate planning formulation to account for additional environmental and social criteria to incorporate triple bottom line consideration of sustainability. We show how these additional criteria can be appended to traditional cost accounting in order to address sustainability in aggregate planning. We analyze the revised models and interpret the results on a case study from real life that would be insightful for decision makers. PMID:26807848

  2. Sustainability in Supply Chain Management: Aggregate Planning from Sustainability Perspective

    PubMed Central

    Türkay, Metin; Saraçoğlu, Öztürk; Arslan, Mehmet Can

    2016-01-01

    Supply chain management that considers the flow of raw materials, products and information has become a focal issue in modern manufacturing and service systems. Supply chain management requires effective use of assets and information that has far reaching implications beyond satisfaction of customer demand, flow of goods, services or capital. Aggregate planning, a fundamental decision model in supply chain management, refers to the determination of production, inventory, capacity and labor usage levels in the medium term. Traditionally standard mathematical programming formulation is used to devise the aggregate plan so as to minimize the total cost of operations. However, this formulation is purely an economic model that does not include sustainability considerations. In this study, we revise the standard aggregate planning formulation to account for additional environmental and social criteria to incorporate triple bottom line consideration of sustainability. We show how these additional criteria can be appended to traditional cost accounting in order to address sustainability in aggregate planning. We analyze the revised models and interpret the results on a case study from real life that would be insightful for decision makers. PMID:26807848

  3. Nanoarchitectonics of Molecular Aggregates: Science and Technology

    SciTech Connect

    Ramanathan, Nathan Muruganathan; Hong, Kunlun; Ji, Dr. Qingmin; Hill, Dr. Jonathan P; Ariga, Katsuhiko; Yusuke, Yonamine

    2014-01-01

    The field of making, studying and using molecular aggregates, in which the individual molecules (monomers) are arranged in a regular fashion, has come a long way. Taking control over the aggregation of small molecules and polymers in bulk, on surfaces and at interfaces pose a considerable challenge for their utilization in modern high tech applications. In this review we provide a detailed insight into recent trends in molecular aggregates from the perspectives of nanoarchitectonics.

  4. Diffusion Limited Aggregation: Algorithm optimization revisited

    NASA Astrophysics Data System (ADS)

    Braga, F. L.; Ribeiro, M. S.

    2011-08-01

    The Diffusion Limited Aggregation (DLA) model developed by Witten and Sander in 1978 is useful in modeling a large class of growth phenomena with local dependence. Besides its simplicity this aggregation model has a complex behavior that can be observed at the patterns generated. We propose on this work a brief review of some important proprieties of this model and present an algorithm to simulate a DLA aggregates that simpler and efficient compared to others found in the literature.

  5. Junk-Bond Colleges.

    ERIC Educational Resources Information Center

    Van Der Werf, Martin

    2003-01-01

    Describes how a long-predicted decline in the fortunes of small private colleges is beginning to show up in the bond market, as the number of colleges now rated in the junk category has nearly doubled. (EV)

  6. Immunogenicity of therapeutic proteins: Influence of aggregation

    PubMed Central

    Derrick, Jeremy P.; Dearman, Rebecca J.; Kimber, Ian

    2014-01-01

    The elicitation of anti-drug antibodies (ADA) against biotherapeutics can have detrimental effects on drug safety, efficacy, and pharmacokinetics. The immunogenicity of biotherapeutics is, therefore, an important issue. There is evidence that protein aggregation can result in enhanced immunogenicity; however, the precise immunological and biochemical mechanisms responsible are poorly defined. In the context of biotherapeutic drug development and safety assessment, understanding the mechanisms underlying aggregate immunogenicity is of considerable interest. This review provides an overview of the phenomenon of protein aggregation, the production of unwanted aggregates during bioprocessing, and how the immune response to aggregated protein differs from that provoked by non-aggregated protein. Of particular interest is the nature of the interaction of aggregates with the immune system and how subsequent ADA responses are induced. Pathways considered here include ‘classical’ activation of the immune system involving antigen presenting cells and, alternatively, the breakdown of B-cell tolerance. Additionally, methods available to screen for aggregation and immunogenicity will be described. With an increased understanding of aggregation-enhanced immune responses, it may be possible to develop improved manufacturing and screening processes to avoid, or at least reduce, the problems associated with ADA. PMID:23919460

  7. Microbial aggregates in anaerobic wastewater treatment.

    PubMed

    Kosaric, N; Blaszczyk, R

    1990-01-01

    The phenomenon aggregation of anaerobic bacteria gives an opportunity to speed up the digestion rate during methanogenesis. The aggregates are mainly composed of methanogenic bacteria which convert acetate and H2/CO2 into methane. Other bacteria are also included in the aggregates but their concentration is rather small. The aggregates may also be formed during acetogenesis or even hydrolysis but such aggregates are not stable and disrupt quickly when not fed. A two stage process seems to be suitable when high concentrated solid waste must be treated. Special conditions are necessary to promote aggregate formation from methanogenic bacteria but aggregates once formed are stable without feeding even for a few years. The structure, texture and activity of bacterial aggregates depend on several parameters: (1)--temperature and pH, (2)--wastewater composition and (3)--hydrodynamic conditions within the reactor. The common influence of all these parameters is still rather unknown but some recommendations may be given. Temperature and pH should be maintained in the range which is optimal for methanogenic bacteria e.g. a temperature between 32 and 50 degrees C and a value pH between 6.5 and 7.5. Wastewaters should contain soluble wastes and the specific loading rate should be around one kgCOD(kgVSS)-1 d-1. The concentration of the elements influences aggregate composition and probably structure and texture. At high calcium concentration a change in the colour of the granules has been observed. Research is necessary to investigate the influence of other elements and organic toxicants on maintenance of the aggregates. Hydrodynamic conditions seem to influence the stability of the granules over long time periods. At low liquid stream rates, aggregates may starve and lysis within the aggregates is possible which results in hollowing of aggregates and their floating. At high liquid stream rates the aggregates may be disrupted and washed out of the reactor as a flocculent

  8. Bouncing behavior of microscopic dust aggregates

    NASA Astrophysics Data System (ADS)

    Seizinger, A.; Kley, W.

    2013-03-01

    Context. Bouncing collisions of dust aggregates within the protoplanetary disk may have a significant impact on the growth process of planetesimals. Yet, the conditions that result in bouncing are not very well understood. Existing simulations studying the bouncing behavior used aggregates with an artificial, very regular internal structure. Aims: Here, we study the bouncing behavior of sub-mm dust aggregates that are constructed applying different sample preparation methods. We analyze how the internal structure of the aggregate alters the collisional outcome and we determine the influence of aggregate size, porosity, collision velocity, and impact parameter. Methods: We use molecular dynamics simulations where the individual aggregates are treated as spheres that are made up of several hundred thousand individual monomers. The simulations are run on graphic cards (GPUs). Results: Statistical bulk properties and thus bouncing behavior of sub-mm dust aggregates depend heavily on the preparation method. In particular, there is no unique relation between the average volume filling factor and the coordination number of the aggregate. Realistic aggregates bounce only if their volume filling factor exceeds 0.5 and collision velocities are below 0.1 ms-1. Conclusions: For dust particles in the protoplanetary nebula we suggest that the bouncing barrier may not be such a strong handicap in the growth phase of dust agglomerates, at least in the size range of ≈100 μm.

  9. A competitive aggregation model for flash nanoprecipitation.

    PubMed

    Cheng, Janine Chungyin; Vigil, R D; Fox, R O

    2010-11-15

    Flash NanoPrecipitation (FNP) is a novel approach for producing functional nanoparticles stabilized by amphiphilic block copolymers. FNP involves the rapid mixing of a hydrophobic active (organic) and an amphiphilic di-block copolymer with a non-solvent (water) and subsequent co-precipitation of nanoparticles composed of both the organic and copolymer. During this process, the particle size distribution (PSD) is frozen and stabilized by the hydrophilic portion of the amphiphilic di-block copolymer residing on the particle surface. That is, the particle growth is kinetically arrested and thus a narrow PSD can be attained. To model the co-precipitation process, a bivariate population balance equation (PBE) has been formulated to account for the competitive aggregation of the organic and copolymer versus pure organic-organic or copolymer-copolymer aggregation. Aggregation rate kernels have been derived to account for the major aggregation events: free coupling, unimer insertion, and aggregate fusion. The resulting PBE is solved both by direct integration and by using the conditional quadrature method of moments (CQMOM). By solving the competitive aggregation model under well-mixed conditions, it is demonstrated that the PSD is controlled primarily by the copolymer-copolymer aggregation process and that the energy barrier to aggregate fusion plays a key role in determining the PSD. It is also shown that the characteristic aggregation times are smaller than the turbulent mixing time so that the FNP process is always mixing limited. PMID:20800847

  10. Deterministic aggregation kinetics of superparamagnetic colloidal particles

    NASA Astrophysics Data System (ADS)

    Reynolds, Colin P.; Klop, Kira E.; Lavergne, François A.; Morrow, Sarah M.; Aarts, Dirk G. A. L.; Dullens, Roel P. A.

    2015-12-01

    We study the irreversible aggregation kinetics of superparamagnetic colloidal particles in two dimensions in the presence of an in-plane magnetic field at low packing fractions. Optical microscopy and image analysis techniques are used to follow the aggregation process and in particular study the packing fraction and field dependence of the mean cluster size. We compare these to the theoretically predicted scalings for diffusion limited and deterministic aggregation. It is shown that the aggregation kinetics for our experimental system is consistent with a deterministic mechanism, which thus shows that the contribution of diffusion is negligible.

  11. Neuronal aggregates: formation, clearance and spreading

    PubMed Central

    Lim, Junghyun; Yue, Zhenyu

    2015-01-01

    Summary Proteostasis is maintained by multiple cellular pathways, including protein synthesis, quality control and degradation. An imbalance of neuronal proteostasis, associated with protein misfolding and aggregation, leads to proteinopathies or neurodegeneration. While genetic variations and protein modifications contribute to aggregate formation, components of the proteostasis network dictate the fate of protein aggregates. Here we provide an overview of proteostasis pathways and their interplay (particularly autophagy) with the metabolism of disease-related proteins. We review recent studies on neuronal activity-mediated regulation of proteostasis and transcellular propagation of protein aggregates in the nervous system. Targeting proteostasis pathways therapeutically remains an attractive but challenging task. PMID:25710535

  12. Learning Resources Operational Model.

    ERIC Educational Resources Information Center

    Tarrant County Junior Coll. District, Ft. Worth, TX.

    The learning resources program at Tarrant Count Junior College calls for a district-wide resource dedicated to the support of instruction. Traditional library and media services are subsumed within this approach. The operational model consists of many interrelated subsystems most of which are described by flow charts. The systems viewpoint is…

  13. Operation C O P

    ERIC Educational Resources Information Center

    Mueck, Robert P.; Parker, Ashley

    2011-01-01

    Sometimes one never knows what sparks an idea or causes people to come together and take something forward. An example of this is Operation COP at the University of Maryland in College Park. Their version of the "See Something, Say Something" campaign is being touted as a crime prevention program, while it is at the same time an anti-terrorism…

  14. Community Colleges. Haskell Indian Junior College

    ERIC Educational Resources Information Center

    Martin, Donna

    1974-01-01

    Haskell Indian Junior College in Lawrence, Kansas is the only degree-granting junior college under the authority of the Bureau of Indian Affairs. As a government-supported institution of higher education, the school is unique in another way: each of its students, who receive free room, board and tuition, must be one-fourth Indian blood. (Author)

  15. College Affordability: Implications for College Opportunity

    ERIC Educational Resources Information Center

    Perna, Laura W.; Li, Chunyan

    2006-01-01

    By examining trends in college affordability, this article explores the extent to which the public perception that college is not affordable is justified. First, the article describes trends in national indicators that contribute to ability to pay, including income growth, health care costs, debt burden, and personal savings rates. Trends in…

  16. College Transition Programs for Community College Students

    ERIC Educational Resources Information Center

    Haugen, Douglas E.

    2012-01-01

    Over the past four decades the number of students enrolling in colleges and universities requiring at least one pre-college level course has been about one-third of all students. Underprepared students are as likely to complete their academic goals as their prepared counterparts if they are able to complete their remedial course work. This study…

  17. Mission Middle College (The Middle College Concept).

    ERIC Educational Resources Information Center

    Lang-Jolliff, Jennifer

    Fashioned after the LaGuardia model, Mission Middle College Program began in the fall of 2001. It is an educational collaboration between the Santa Clara Unified School District (SCUSD) and Mission Community College in Santa Clara, California. It is a program for students who are highly intellectual and capable but uninspired and outside the high…

  18. College Turnaround: Guidance on Colleges in Recovery.

    ERIC Educational Resources Information Center

    Atkinson, David

    This document is intended to assist senior managers and governors of colleges in the United Kingdom that are faced with serious difficulties. The first section provides an overview of how the issues of college recovery were handled under the Further Education Funding Council. The second section examines crisis and recovery in corporations and…

  19. All-College Council at Maryville College.

    ERIC Educational Resources Information Center

    Blair, Carolyn L.

    In May 1968, the Special Committee on Community Life and Structure of Maryville College recommended that an All-College Council be organized by January 1969. Following approval of this recommendation by the Executive Council of the Faculty, the Special Committee proposed the nomination of 15 council members who were subsequently chosen in a…

  20. Collisional Aggregation Due to Turbulence

    NASA Astrophysics Data System (ADS)

    Pumir, Alain; Wilkinson, Michael

    2016-03-01

    Collisions between particles suspended in a fluid play an important role in many physical processes. As an example, collisions of microscopic water droplets in clouds are a necessary step in the production of macroscopic raindrops. Collisions of dust grains are also conjectured to be important for planet formation in the gas surrounding young stars and to play a role in the dynamics of sand storms. In these processes, collisions are favored by fast turbulent motions. Here we review recent advances in the understanding of collisional aggregation due to turbulence. We discuss the role of fractal clustering of particles and caustic singularities of their velocities. We also discuss limitations of the Smoluchowski equation for modeling such processes. These advances lead to a semiquantitative understanding on the influence of turbulence on collision rates and point to deficiencies in the current understanding of rainfall and planet formation.

  1. Swarms: Optimum aggregations of spacecraft

    NASA Technical Reports Server (NTRS)

    Mayer, H. L.

    1980-01-01

    Swarms are aggregations of spacecraft or elements of a space system which are cooperative in function, but physically isolated or only loosely connected. For some missions the swarm configuration may be optimum compared to a group of completely independent spacecraft or a complex rigidly integrated spacecraft or space platform. General features of swarms are induced by considering an ensemble of 26 swarms, examples ranging from Earth centered swarms for commercial application to swarms for exploring minor planets. A concept for a low altitude swarm as a substitute for a space platform is proposed and a preliminary design studied. The salient design feature is the web of tethers holding the 30 km swarm in a rigid two dimensional array in the orbital plane. A mathematical discussion and tutorial in tether technology and in some aspects of the distribution of services (mass, energy, and information to swarm elements) are included.

  2. Morphological classification of nanoceramic aggregates

    NASA Astrophysics Data System (ADS)

    Crosta, Giovanni F.; Kang, Bongwoo; Ospina, Carolina; Sung, Changmo

    2005-01-01

    Aluminum silicate nanoaggregates grown at near-room temperature on an organic template under a variety of experimental conditions have been imaged by transmission electron microscopy. Images have been automatically classified by an algorithm based on "spectrum enhancement", multivariate statistics and supervised optimization. Spectrum enhancement consists of subtracting, in the log scale, a known function of wavenumber from the angle averaged power spectral density of the image. Enhanced spectra of each image, after polynomial interpolation, have been regarded as morphological descriptors and as such submitted to principal components analysis nested with a multiobjective parameter optimization algorithm. The latter has maximized pairwise discrimination between classes of materials. The role of the organic template and of a reaction parameter on aggregate morphology has been assessed at two magnification scales. Classification results have also been related to crystal structure data derived from selected area electron diffraction patterns.

  3. PRODUCTION OF CONSTRUCTION AGGREGATES FROM FLUE GAS DESULFURIZATION SLUDGE

    SciTech Connect

    1998-12-01

    Through a cooperative agreement with DOE, the Research and Development Department of CONSOL Inc. (CONSOL R and D) is teaming with SynAggs, Inc. and Duquesne Light to design, construct, and operate a 500 lb/h continuous pilot plant to produce road construction aggregate from a mixture of wet flue gas desulfurization (FGD) sludge, fly ash, and other components. The proposed project is divided into six tasks: (1) Project Management; (2) Mix Design Evaluation; (3) Process Design; (4) Construction; (5) Start-Up and Operation; and (6) Reporting. In this quarter, Tasks 1 and 2 were completed. A project management plan (Task 1) was issued to DOE on October 22, 1998 . The mix design evaluation (Task 2) with Duquesne Light Elrama Station FGD sludge and Allegheny Power Hatfields Ferry Station fly ash was completed. Eight semi-continuous bench-scale tests were conducted to examine the effects of mix formulation on aggregate properties. A suitable mix formulation was identified to produce aggregates that meet specifications of the American Association of State High Transport Officials (AASHTO) as Class A aggregate for use in highway construction. The mix formulation was used in designing the flow sheet of the pilot plant. The process design (Task 3) is approximately 80% completed. Equipment was evaluated to comply with design requirements. The design for the curing vessel was completed by an outside engineering firm. All major equipment items for the pilot plant, except the curing vessel, were ordered. Pilot plant construction (Task 4) was begun in October. The Hazardous Substance Plan was issued to DOE. The Allegheny County (PA) Heat Department determined that an air emission permit is not required for operation of the pilot plant.

  4. Colloidal aggregation in polymer blends.

    PubMed

    Benhamou, M; Ridouane, H; Hachem, E-K; Derouiche, A; Rahmoune, M

    2005-06-22

    We consider here a low-density assembly of colloidal particles immersed in a critical polymer mixture of two chemically incompatible polymers. We assume that, close to the critical point of the free mixture, the colloids prefer to be surrounded by one polymer (critical adsorption). As result, one is assisted to a reversible colloidal aggregation in the nonpreferred phase, due the existence of a long-range attractive Casimir force between particles. This aggregation is a phase transition driving the colloidal system from dilute to dense phases, as the usual gas-liquid transition. We are interested in a quantitative investigation of the phase diagram of the immersed colloids. We suppose that the positions of particles are disordered, and the disorder is quenched and follows a Gaussian distribution. To apprehend the problem, use is made of the standard phi(4) theory, where the field phi represents the composition fluctuation (order parameter), combined with the standard cumulant method. First, we derive the expression of the effective free energy of colloids and show that this is of Flory-Huggins type. Second, we find that the interaction parameter u between colloids is simply a linear combination of the isotherm compressibility and specific heat of the free mixture. Third, with the help of the derived effective free energy, we determine the complete shape of the phase diagram (binodal and spinodal) in the (Psi,u) plane, with Psi as the volume fraction of immersed colloids. The continuous "gas-liquid" transition occurs at some critical point K of coordinates (Psi(c) = 0.5,u(c) = 2). Finally, we emphasize that the present work is a natural extension of that, relative to simple liquid mixtures incorporating colloids. PMID:16035822

  5. Detergent-mediated protein aggregation

    PubMed Central

    Neale, Chris; Ghanei, Hamed; Holyoake, John; Bishop, Russell E.; Privé, Gilbert G.; Pomès, Régis

    2016-01-01

    Because detergents are commonly used to solvate membrane proteins for structural evaluation, much attention has been devoted to assessing the conformational bias imparted by detergent micelles in comparison to the native environment of the lipid bilayer. Here, we conduct six 500-ns simulations of a system with >600,000 atoms to investigate the spontaneous self assembly of dodecylphosphocholine detergent around multiple molecules of the integral membrane protein PagP. This detergent formed equatorial micelles in which acyl chains surround the protein’s hydrophobic belt, confirming existing models of the detergent solvation of membrane proteins. In addition, unexpectedly, the extracellular and periplasmic apical surfaces of PagP interacted with the headgroups of detergents in other micelles 85 and 60% of the time, respectively, forming complexes that were stable for hundreds of nanoseconds. In some cases, an apical surface of one molecule of PagP interacted with an equatorial micelle surrounding another molecule of PagP. In other cases, the apical surfaces of two molecules of PagP simultaneously bound a neat detergent micelle. In these ways, detergents mediated the non-specific aggregation of folded PagP. These simulation results are consistent with dynamic light scattering experiments, which show that, at detergent concentrations ≥600 mM, PagP induces the formation of large scattering species that are likely to contain many copies of the PagP protein. Together, these simulation and experimental results point to a potentially generic mechanism of detergent-mediated protein aggregation. PMID:23466535

  6. Establishing American Colleges Abroad.

    ERIC Educational Resources Information Center

    Greene, William E.

    1990-01-01

    Describes the growing involvement of U.S. two-year colleges in establishing programs abroad to enable foreign students to complete one or two years of college-level work in their home country before transferring to U.S. universities. Highlights the activities of several community colleges in the Pacific Rim. Identifies conditions basic to future…

  7. COMPREHENSIVE JUNIOR COLLEGES.

    ERIC Educational Resources Information Center

    NIKITAS, CHRISTUS M.; AND OTHERS

    TO MEET THE STATE'S HIGHER EDUCATION NEEDS, THE NEW HAMPSHIRE JUNIOR COLLEGE COMMISSION DEVELOPED A PLAN OF (1) GRADUAL AND SELECTIVE CONVERSION OF THE STATE'S TECHNICAL AND VOCATIONAL SCHOOLS TO COMPREHENSIVE JUNIOR COLLEGES, (2) SELECTIVE ADDITION OF 2-YEAR PROGRAMS AT THE STATE COLLEGES AND INSTITUTES, AND (3) ESTABLISHMENT OF A STATE…

  8. Alverno College. Exemplars.

    ERIC Educational Resources Information Center

    Iannozzi, Maria

    This report describes efforts by Alverno College (Wisconsin) to reform the traditional liberal arts curriculum and redefine the relevance of women's colleges. Beginning in the early 1970s, the college began to refocus student learning by integrating ability development and performance-based knowledge. Faculty and staff redefined the curriculum,…

  9. College Access Marketing

    ERIC Educational Resources Information Center

    Tremblay, Christopher W.

    2011-01-01

    College Access Marketing (CAM) is a relatively new phenomenon that seeks to positively influence the college-going rate. This report defines CAM, describes CAM examples, and discusses how CAM seeks to counter barriers to college. It explores four main elements of CAM: information, marketing, advocacy, and social mobilization. Further, it…

  10. The College Handbook 1993.

    ERIC Educational Resources Information Center

    College Board, New York, NY.

    This directory is intended to provide students and their advisors with authoritative information on 3,171 colleges and universities in the United States as well as supplementary information. The information was gathered in the winter and spring of 1992 through the College Board's Annual Survey of Colleges with descriptions subsequently verified…

  11. Early College High Schools

    ERIC Educational Resources Information Center

    Dessoff, Alan

    2011-01-01

    For at-risk students who stand little chance of going to college, or even finishing high school, a growing number of districts have found a solution: Give them an early start in college while they still are in high school. The early college high school (ECHS) movement that began with funding from the Bill and Melinda Gates Foundation 10 years ago…

  12. What Is College for?

    ERIC Educational Resources Information Center

    Delbanco, Andrew

    2012-01-01

    What is college for? There are basically three prevailing answers to this question. The most common answer is an economic one, though it is really two linked answers: first, that providing more people with a college education is good for the economic health of the nation; and second, that going to college is good for the economic competitiveness…

  13. The College Promise

    ERIC Educational Resources Information Center

    Sturgeon, Julie

    2009-01-01

    College fees and tuition are rising--430 percent since 1982. Student borrowing for college has more than doubled since 1998, and about 50 percent of lower-income students head to college following high school, compared to 80 percent of high-income students, according to the National Center for Education Statistics. Various public school districts…

  14. Prometheus College Bound.

    ERIC Educational Resources Information Center

    Austell, David B., Jr.

    1986-01-01

    Reports on interviews conducted to assess the status of humanities instruction in North Carolina's community colleges. Includes Dallas Herring's reflections on the establishment and growth of the state's community college system. Summarizes interviews with central office representatives and two-year college managers concerning the mission and…

  15. THE JUNIOR COLLEGE STUDENT.

    ERIC Educational Resources Information Center

    BECKER, SUSAN J.; COOLEY, WILLIAM W.

    USING DATA OBTAINED BY PROJECT TALENT, A NATIONWIDE STUDY OF HIGH SCHOOL YOUTH, THE AUTHORS DESCRIBE THE JUNIOR COLLEGE STUDENT. JUNIOR COLLEGE, NONCOLLEGE, AND SENIOR COLLEGE STUDENTS WERE COMPARED IN TERMS OF SIX MEASURES OF INFORMATION AND EIGHT MEASURES OF GENERAL APTITUDE AND ABILITY. THROUGH THE USE OF A 6-GROUP DISCRIMINANT ANALYSIS, IT WAS…

  16. Community Colleges Online

    ERIC Educational Resources Information Center

    Crawford, Corinne; Persaud, Colin

    2013-01-01

    Presently, community colleges are bursting at the seams. In 2011, community colleges turned away more than 400,000 prospective students. In the next six years, 63 percent of all U.S. jobs will require postsecondary education. Twenty two million new workers with postsecondary degrees will be needed by 2018. Community colleges are turning…

  17. A COLLEGE HEALTH CENTER.

    ERIC Educational Resources Information Center

    BRAD, BERNARD

    THIS REPORT CONSIDERS PROBLEMS AND SOLUTIONS RELATED TO THE DESIGN AND ESTABLISHMENT OF COLLEGE HEALTH FACILITIES. THIS INCLUDES THE RESULTS OF A STUDY INVOLVING COLORADO, KNOX, AND WITTENBERG COLLEGES IN WHICH PERSONAL VISITS AND EXPERT TESTIMONY CONCLUDED THAT THE HEALTH SERVICES OF SMALL COLLEGES IN THE CENTRAL AND WESTERN STATES WERE SERIOUSLY…

  18. A College Health Center.

    ERIC Educational Resources Information Center

    Bard, Bernard

    This report considers problems and solutions related to the design and establishment of college health facilities. This includes the results of a study involving Colorado, Knox, and Wittenberg Colleges in which personal visits and expert testimony concluded that the health services of small colleges in the central and western states were seriously…

  19. Mobile phone usage in complex urban systems: a space-time, aggregated human activity study

    NASA Astrophysics Data System (ADS)

    Tranos, Emmanouil; Nijkamp, Peter

    2015-04-01

    The present study aims to demonstrate the importance of digital data for investigating space-time dynamics of aggregated human activity in urban systems. Such dynamics can be monitored and modelled using data from mobile phone operators regarding mobile telephone usage. Using such an extensive dataset from the city of Amsterdam, this paper introduces space-time explanatory models of aggregated human activity patterns. Various modelling experiments and results are presented, which demonstrate that mobile telephone data are a good proxy of the space-time dynamics of aggregated human activity in the city.

  20. Formation and Growth of Stacking Fault Tetrahedra in Ni via Vacancy Aggregation Mechanism

    SciTech Connect

    Aidhy, Dilpuneet S.; Lu, Chenyang; Jin, Ke; Bei, Hongbin; Zhang, Yanwen; Wang, Lumin; Weber, William J.

    2015-12-29

    Using molecular dynamics simulations, the formation and growth of stacking fault tetrahedra (SFT) are captured by vacancy cluster diffusion and aggregation mechanisms in Ni. The vacancytetrahedron acts as a nucleation point for SFT formation. Simulations show that perfect SFT can grow to the next size perfect SFT via a vacancy aggregation mechanism. The stopping and range of ions in matter (SRIM) calculations and transmission electron microscopy (TEM) observations reveal that SFT can form farther away from the initial cascade-event locations, indicating the operation of diffusion-based vacancy-aggregation mechanism.

  1. Simulation of Ionic Aggregation and Ion Dynamics in Model Ionomers

    NASA Astrophysics Data System (ADS)

    Frischknecht, Amalie L.

    2012-02-01

    Ionomers, polymers containing a small fraction of covalently bound ionic groups, are of interest as possible electrolytes in batteries. A single-ion conducting polymer electrolyte would be safer and have higher efficiency than the currently-used liquid electrolytes. However, to date ionomeric materials do not have sufficiently high conductivities for practical application. This is most likely because the ions tend to form aggregates, leading to slow ion transport. A key question is therefore how molecular structure affects the ionic aggregation and ion dynamics. To probe these structure-property relationships, we have performed molecular simulations of a set of recently synthesized poly(ethylene-co-acrylic acid) copolymers and ionomers, with a focus on the morphology of the ionic aggregates. The ionomers have a precise, constant spacing of charged groups, making them ideal for direct comparisons with simulations. Ab initio calculations give insight into the expected coordination of cations with fragments of the ionomers. All-atom molecular dynamics (MD) simulations of the ionomer melt show aggregation of the ionic groups into extended string-like clusters. An extensive set of coarse-grained molecular dynamics simulations extend the results to longer times and larger length scales. The structure factors calculated from the MD simulations compare favorably with x-ray scattering data. Furthermore, the simulations give a detailed picture of the sizes, shapes, and composition of the ionic aggregates, and how they depend on polymer architecture. Implications for ion transport will be discussed. [Sandia National Laboratories is a multi-program laboratory managed and operated by Sandia Corporation, a wholly owned subsidiary of Lockheed Martin Corporation, for the U.S. Department of Energy's National Nuclear Security Administration under contract DE-AC04-94AL85000.

  2. Impact of Particle Aggregation on Nanoparticle Reactivity

    NASA Astrophysics Data System (ADS)

    Jassby, David

    2011-12-01

    The prevalence of nanoparticles in the environment is expected to grow in the coming years due to their increasing pervasiveness in consumer and industrial applications. Once released into the environment, nanoparticles encounter conditions of pH, salinity, UV light, and other solution conditions that may alter their surface characteristics and lead to aggregation. The unique properties that make nanoparticles desirable are a direct consequence of their size and increased surface area. Therefore, it is critical to recognize how aggregation alters the reactive properties of nanomaterials, if we wish to understand how these properties are going to behave once released into the environment. The size and structure of nanoparticle aggregates depend on surrounding conditions, including hydrodynamic ones. Depending on these conditions, aggregates can be large or small, tightly packed or loosely bound. Characterizing and measuring these changes to aggregate morphology is important to understanding the impact of aggregation on nanoparticle reactive properties. Examples of decreased reactivity due to aggregation include the case where tightly packed aggregates have fewer available surface sites compared to loosely packed ones; also, photocatalytic particles embedded in the center of large aggregates will experience less light when compared to particles embedded in small aggregates. However, aggregation also results in an increase in solid-solid interfaces between nanoparticles. This can result in increased energy transfer between neighboring particles, surface passivation, and altered surface tension. These phenomena can lead to an increase in reactivity. The goal of this thesis is to examine the impacts of aggregation on the reactivity of a select group of nanomaterials. Additionally, we examined how aggregation impacts the removal efficiency of fullerene nanoparticles using membrane filtration. The materials we selected to study include ZnS---a metal chalcogenide

  3. Automated Data Aggregation for Time-Series Analysis: Study Case on Anaesthesia Data Warehouse.

    PubMed

    Lamer, Antoine; Jeanne, Mathieu; Ficheur, Grégoire; Marcilly, Romaric

    2016-01-01

    Data stored in operational databases are not reusable directly. Aggregation modules are necessary to facilitate secondary use. They decrease volume of data while increasing the number of available information. In this paper, we present four automated engines of aggregation, integrated into an anaesthesia data warehouse. Four instances of clinical questions illustrate the use of those engines for various improvements of quality of care: duration of procedure, drug administration, assessment of hypotension and its related treatment. PMID:27071886

  4. Joseph Lister's first operation

    PubMed Central

    Richardson, Ruth; Rhodes, Bryan

    2013-01-01

    Joseph Lister was still a medical student in 1851 when he served as house surgeon at University College Hospital, London, under John Erichsen. Here we report the first major operation that Lister accomplished, hitherto apparently missed by biographers. We chart his exemplary dealings with an emergency case of eviscerating stab wound in a woman brought to casualty at night, when he had been in post for less than a month. The case demonstrates Lister's fundamental competence at an early stage in his training. We outline the context of debate and controversy over the repair of lacerated gut at the time, and argue that Lister's period at University College London was profoundly formative.

  5. 24 CFR 58.32 - Project aggregation.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... other activities and actions. (See 40 CFR 1508.25(a)). (2) Consider reasonable alternative courses of... 24 Housing and Urban Development 1 2010-04-01 2010-04-01 false Project aggregation. 58.32 Section... Environmental Review Process: Documentation, Range of Activities, Project Aggregation and Classification §...

  6. 24 CFR 58.32 - Project aggregation.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ... other activities and actions. (See 40 CFR 1508.25(a)). (2) Consider reasonable alternative courses of... 24 Housing and Urban Development 1 2011-04-01 2011-04-01 false Project aggregation. 58.32 Section... Environmental Review Process: Documentation, Range of Activities, Project Aggregation and Classification §...

  7. 24 CFR 58.32 - Project aggregation.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ... other activities and actions. (See 40 CFR 1508.25(a)). (2) Consider reasonable alternative courses of... 24 Housing and Urban Development 1 2014-04-01 2014-04-01 false Project aggregation. 58.32 Section... Environmental Review Process: Documentation, Range of Activities, Project Aggregation and Classification §...

  8. 24 CFR 58.32 - Project aggregation.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ... other activities and actions. (See 40 CFR 1508.25(a)). (2) Consider reasonable alternative courses of... 24 Housing and Urban Development 1 2012-04-01 2012-04-01 false Project aggregation. 58.32 Section... Environmental Review Process: Documentation, Range of Activities, Project Aggregation and Classification §...

  9. 7 CFR 1.6 - Aggregating requests.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... 7 Agriculture 1 2010-01-01 2010-01-01 false Aggregating requests. 1.6 Section 1.6 Agriculture Office of the Secretary of Agriculture ADMINISTRATIVE REGULATIONS Official Records § 1.6 Aggregating requests. When an agency reasonably believes that a requester, or a group of requesters acting in...

  10. 7 CFR 1.6 - Aggregating requests.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ... 7 Agriculture 1 2013-01-01 2013-01-01 false Aggregating requests. 1.6 Section 1.6 Agriculture Office of the Secretary of Agriculture ADMINISTRATIVE REGULATIONS Official Records § 1.6 Aggregating requests. When an agency reasonably believes that a requester, or a group of requesters acting in...

  11. Streaming instability of aggregating slime mold amoebae

    NASA Astrophysics Data System (ADS)

    Levine, Herbert; Reynolds, William

    1991-05-01

    We propose a new model of aggregation in the cellular slime mold D. Discoideum. Our approach couples the excitable signaling system to amoeba chemotaxis; the resultant system of equations is tractable to analytical and numerical approaches. Using our model, we derive the existence of a streaming instability for the concentric target aggregation pattern.

  12. Choosing Aggregation Rules for Composite Indicators

    ERIC Educational Resources Information Center

    Munda, Giuseppe

    2012-01-01

    From a formal point of view, a composite indicator is an aggregate of all dimensions, objectives, individual indicators and variables used for its construction. This implies that what defines a composite indicator is the set of properties underlying its mathematical aggregation convention. In this article, I try to revise the theoretical debate on…

  13. Biomass round bales infield aggregation logistic scenarios

    Technology Transfer Automated Retrieval System (TEKTRAN)

    Biomass bales often need to be aggregated (collected into groups and transported) to a field-edge stack for temporary storage for feedlots or processing facilities. Aggregating the bales with the least total distance involved is a goal of producers and bale handlers. Several logistics scenarios for ...

  14. 24 CFR 50.21 - Aggregation.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... 24 Housing and Urban Development 1 2010-04-01 2010-04-01 false Aggregation. 50.21 Section 50.21 Housing and Urban Development Office of the Secretary, Department of Housing and Urban Development... Aggregation. Activities which are geographically related and are logical parts of a composite of...

  15. 42 CFR 411.106 - Aggregation rules.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 42 Public Health 2 2010-10-01 2010-10-01 false Aggregation rules. 411.106 Section 411.106 Public Health CENTERS FOR MEDICARE & MEDICAID SERVICES, DEPARTMENT OF HEALTH AND HUMAN SERVICES MEDICARE PROGRAM... Under Group Health Plans: General Provisions § 411.106 Aggregation rules. The following rules apply...

  16. Teaching Aggregate Demand and Supply Models

    ERIC Educational Resources Information Center

    Wells, Graeme

    2010-01-01

    The author analyzes the inflation-targeting model that underlies recent textbook expositions of the aggregate demand-aggregate supply approach used in introductory courses in macroeconomics. He shows how numerical simulations of a model with inflation inertia can be used as a tool to help students understand adjustments in response to demand and…

  17. Aggregate size distribution of the soil loss

    NASA Astrophysics Data System (ADS)

    Szabó, Judit Alexandra; Jakab, Gergely; Szabó, Boglárka; Józsa, Sándor; Szalai, Zoltán; Centeri, Csaba

    2016-04-01

    In agricultural areas the soil erosion and soil loss estimation is vital information in long-term planning. During the initial period of the erosion a part of the soil particles and aggregates get transportable and nutrients and organic matter could be transported due to the effect of water or wind. This preliminary phase was studied with laboratory-scale rainfall simulator. Developed surface crust and aggregate size composition of the runoff was examined in six different slope-roughness-moisture content combination of a Cambisol and a Regosol. The ratio of micro- and macro aggregates in the runoff indicate the stability of the aggregates and determine the transport capacity of the runoff. Both soil samples were taken from field where the water erosion is a potential hazard. During the experiment the whole amount of runoff and sediment was collected through sieve series to a bucket to separate the micro- and macro aggregates. In case of both samples the micro aggregates dominate in the runoff and the runoff rates are similar. Although the runoff of the Regosol - with dominant >1000μm macro aggregate content - contained almost nothing but <50μm sized micro aggregates. Meanwhile the runoff of the Cambisol - with more balanced micro and macro aggregate content - contained dominantly 50-250μm sized micro aggregates and in some case remarkable ratio 250-1000μm sized macro aggregates. This difference occurred because the samples are resistant against drop erosion differently. In case of both sample the selectivity of the erosion and substance matrix redistribution manifested in mineral crusts in the surface where the quartz deposited in place while the lighter organic matter transported with the sediment. The detachment of the aggregates and the redistribution of the particles highly effect on the aggregate composition of the runoff which is connected with the quality of the soil loss. So while the estimation of soil loss quantity is more or less is easy, measuring

  18. Therapeutic Protein Aggregation: Mechanisms, Design, and Control

    PubMed Central

    Roberts, Christopher J.

    2014-01-01

    While it is well known that proteins are only marginally stable in their folded states, it is often less well appreciated that most proteins are inherently aggregation-prone in their unfolded or partially unfolded states, and the resulting aggregates can be extremely stable and long-lived. For therapeutic proteins, aggregates are a significant risk factor for deleterious immune responses in patients, and can form via a variety of mechanisms. Controlling aggregation using a mechanistic approach may allow improved design of therapeutic protein stability, as a complement to existing design strategies that target desired protein structures and function. Recent results highlight the importance of balancing protein environment with the inherent aggregation propensities of polypeptide chains. PMID:24908382

  19. Formation of Tethers from Spreading Cellular Aggregates.

    PubMed

    Beaune, Grégory; Winnik, Françoise M; Brochard-Wyart, Françoise

    2015-12-01

    Membrane tubes are commonly extruded from cells and vesicles when a point-like force is applied on the membrane. We report here the unexpected formation of membrane tubes from lymph node cancer prostate (LNCaP) cell aggregates in the absence of external applied forces. The spreading of LNCaP aggregates deposited on adhesive glass substrates coated with fibronectin is very limited because cell-cell adhesion is stronger than cell-substrate adhesion. Some cells on the aggregate periphery are very motile and try to escape from the aggregate, leading to the formation of membrane tubes. Tethered networks and exchange of cargos between cells were observed as well. Growth of the tubes is followed by either tube retraction or tube rupture. Hence, even very cohesive cells are successful in escaping aggregates, which may lead to epithelial mesenchymal transition and tumor metastasis. We interpret the dynamics of formation and retraction of tubes in the framework of membrane mechanics. PMID:26509898

  20. Aggregation of sodium alkylbenzenesulfonates in aqueous solution

    SciTech Connect

    Magid, L.J.; Shaver, R.J.; Gulari, E.; Bedwell, B.; Alkhafaji, S.

    1981-01-01

    The surfactant 6 phenyl C/sub 12/SNa forms small spherical micelles in aqueous solution, having an aggregation number of 20 to 30 and a fractional charge of 0.45. These micelles are hydrated to the extent of approximately 18 moles H/sub 2/O per moles of surfactant. A second larger aggregate is also present in 6 phenyl C/sub 12/SNa solutions; its importance increases with solution age. Addition of NaCl causes both aggregates to apparently increase modestly in size. The surfactant 8 phenyl C/sub 16/SNa also contains both aggregates in its solutions; the larger one is relatively more important here. The larger aggregate does not correspond to dispersed bits of a liquid crystalline mesophase.

  1. Protein aggregates stimulate macropinocytosis facilitating their propagation.

    PubMed

    Yerbury, Justin J

    2016-03-01

    Temporal and spatial patterns of pathological changes such as loss of neurons and presence of pathological protein aggregates are characteristic of neurodegenerative diseases such as Amyotrophic Lateral Sclerosis, Frontotemporal Dementia, Alzheimer's disease and Parkinson's disease. These patterns are consistent with the propagation of protein misfolding and aggregation reminiscent of the prion diseases. There is a surge of evidence that suggests that large protein aggregates of a range of proteins are able to enter cells via macropinocytosis. Our recent work suggests that this process is activated by the binding of aggregates to the neuron cell surface. The current review considers the potential role of cell surface receptors in the triggering of macropinocytosis by protein aggregates and the possibility of utilizing macropinocytosis pathways as a therapeutic target. PMID:26963158

  2. Imbibition kinetics of spherical colloidal aggregates.

    PubMed

    Debacker, A; Makarchuk, S; Lootens, D; Hébraud, P

    2014-07-11

    The imbibition kinetics of a millimeter-sized aggregate of 300 nm diameter colloidal particles by a wetting pure solvent is studied. Three successive regimes are observed. First, the imbibition proceeds by compressing the air inside the aggregate. Next, the solvent stops when the pressure of the compressed air is equal to the excess of capillary pressure at the meniscus of the wetting solvent in the porous aggregate. The interface is pinned and the aggregate slowly degases up to the point where the pressure of the entrapped air stops decreasing and is controlled by the capillary pressure. Finally, the imbibition starts again at a constant excess of pressure, smaller than the capillary pressure but larger than the one of the atmosphere. This last stage leads to the complete infiltration of the aggregate. PMID:25062241

  3. Competitive aggregation dynamics using phase wave signals.

    PubMed

    Sakaguchi, Hidetsugu; Maeyama, Satomi

    2014-10-21

    Coupled equations of the phase equation and the equation of cell concentration n are proposed for competitive aggregation dynamics of slime mold in two dimensions. Phase waves are used as tactic signals of aggregation in this model. Several aggregation clusters are formed initially, and target patterns appear around the localized aggregation clusters. Owing to the competition among target patterns, the number of the localized aggregation clusters decreases, and finally one dominant localized pattern survives. If the phase equation is replaced with the complex Ginzburg-Landau equation, several spiral patterns appear, and n is localized near the center of the spiral patterns. After the competition among spiral patterns, one dominant spiral survives. PMID:24956327

  4. [The equation for platelet aggregation rate].

    PubMed

    Vrzheshch, P V; Verkhusha, V V; Varfolomeev, S D

    1990-01-01

    A platelet aggregation model in shear flow taking into account the kinetics of intercellular fibrinogen bond formation limited by aggregated platelets rotation time was considered. For this consideration the average duration of platelets interaction in flow with shear rate value G is shown to be pi/4G. One fibrinogen bond is sufficient to form a solid aggregate between two platelets. The equation for single platelets disappearance rate concerned with intercellular fibrinogen bond formation, stochastic character of bond distribution in collided platelets and hydrodynamically controlled interaction time was obtained. The Hill's approximation for the obtained aggregation rate dependences was suggested and appropriate constants were determined. The qualitative criterion of platelets aggregating systems behavior was introduced. PMID:2245229

  5. Excited-state dynamics of astaxanthin aggregates

    NASA Astrophysics Data System (ADS)

    Fuciman, Marcel; Durchan, Milan; Šlouf, Václav; Keşan, Gürkan; Polívka, Tomáš

    2013-05-01

    Astaxanthin forms three types of aggregates in hydrated dimethyl sulfoxide (DMSO). In DMSO/water ratio of 1:1, a red-shifted J-aggregate with maximum at 570 nm is generated, while a ratio of 1:9 produces blue-shifted H-aggregates with peaks at 386 nm (H1) and 460 nm (H2). Monomeric astaxanthin in DMSO has an S1 lifetime of 5.3 ps, but a long-lived (33 ps) S∗ signal was also identified. Aggregation changes the S1 lifetimes to 17 ps (H1), 30 ps (H2), and 14 ps (J). Triplet state of astaxanthin, most likely generated via singlet homofission, was observed in H1 and H2 aggregates.

  6. New Mexico aggregate production sites, 1997-1999

    USGS Publications Warehouse

    Orris, Greta J.

    2000-01-01

    This report presents data, including latitude and longitude, for aggregate sites in New Mexico that were believed to be active in the period 1997-1999. The data are presented in paper form in Part A of this report and as Microsoft Excel 97 and Data Interchange Format (DIF) files in Part B. The work was undertaken as part of the effort to update information for the National Atlas. This compilation includes data from: the files of U.S. Geological Survey (USGS); company contacts; the New Mexico Bureau of Mines and Mineral Resources, New Mexico Bureau of Mine Inspection, and the Mining and Minerals Division of the New Mexico Energy, Minerals and Natural Resources Department (Hatton and others, 1998); the Bureau of Land Management Information; and direct communications with some of the aggregate operators. Additional information on most of the sites is available in Hatton and others (1998).

  7. Simulating aggregate dynamics in ocean biogeochemical models

    NASA Astrophysics Data System (ADS)

    Jackson, George A.; Burd, Adrian B.

    2015-04-01

    The dynamics of elements in the water column is complex, depending on multiple biological and physical processes operating at very different physical scales. Coagulation of particulate material is important for transforming particles and moving them in the water column. Mechanistic models of coagulation processes provide a means to predict these processes, help interpret observations, and provide insight into the processes occurring. However, most model applications have focused on describing simple marine systems and mechanisms. We argue that further model development, in close collaboration with field and experimental scientists, is required in order to extend the models to describe the large-scale elemental distributions and interactions being studied as part of GEOTRACES. Models that provide a fundamental description of trace element-particle interactions are required as are experimental tests of the mechanisms involved and the predictions arising from models. However, a comparison between simple and complicated models of aggregation and trace metal provides a means for understanding the implications of simplifying assumptions and providing guidance as to which simplifications are needed.

  8. Community Based Organizations as Initiators of Partnerships with Community Colleges

    ERIC Educational Resources Information Center

    Turner, Sharon Yael

    2012-01-01

    This study focused on community based organizations leading community colleges in workforce development partnerships to train unemployed and underemployed adults. These collaborations operate where community based organizations deliver case management and job search skills, while community colleges offer specific training. In order to examine…

  9. High Tech: Commonplace at America's Community, Technical, and Junior Colleges.

    ERIC Educational Resources Information Center

    Savage, Daniel D.; Brey, Ron

    1987-01-01

    Reports survey findings about two-year colleges' use of telecommunications. Reveals wide acceptance of satellite capabilities for various institutional purposes, significant numbers of colleges owning or operating broadcast television stations, widespread use of electronic mail and teleconferencing, and use of exotic forms of telecommunications by…

  10. Faculty Perceptions of Change Readiness in Liberal Arts Colleges

    ERIC Educational Resources Information Center

    Rupert, Lyle M.

    2015-01-01

    Due to the increasingly competitive environment in which liberal arts colleges operate and the constantly changing needs of students, colleges must continuously adapt and change in order to survive. Due to the high probability of failure when implementing change, it would serve an institution well to increase its readiness to change. This study…

  11. Building a Prosperous Economy. Washington's Community and Technical Colleges

    ERIC Educational Resources Information Center

    Washington State Board for Community and Technical Colleges, 2014

    2014-01-01

    Washington's community and technical colleges are a collective, powerful, unmatched resource for advancing prosperity through education. These 34 colleges not only connect with employers in the regions where they operate, but also with each other through common programs--like advanced manufacturing and allied health--that align with Washington's…

  12. Report of the Senate Select Committee on Community Junior Colleges.

    ERIC Educational Resources Information Center

    Missouri State General Assembly, Jefferson City. Senate.

    The inability of Missouri community college districts--which serve 54% of the state's population but cover only 17% of the state's area--to enlarge their property tax support base, pass capital bond issues, or to increase operational levies gave rise to a legislative study of four major issues: existing laws covering community colleges; the…

  13. Utilizing Partnerships to Maximize Resources in College Counseling Services

    ERIC Educational Resources Information Center

    Stewart, Allison; Moffat, Meridith; Travers, Heather; Cummins, Douglas

    2015-01-01

    Research indicates an increasing number of college students are experiencing severe psychological problems that are impacting their academic performance. However, many colleges and universities operate with constrained budgets that limit their ability to provide adequate counseling services for their student population. Moreover, accessing…

  14. IRS Releases Tax Questionnaire that Asks Colleges to Disclose More

    ERIC Educational Resources Information Center

    Kelderman, Eric

    2008-01-01

    Nearly 400 colleges across the United States are about to be asked to disclose intimate financial details of their operations to the Internal Revenue Service. This article reports on a highly detailed financial questionnaire designed by the IRS for the first phase of its Colleges and Universities Compliance Project, which is part of a continuing…

  15. Community College Exemplary Instructional Programs, 1988-1989.

    ERIC Educational Resources Information Center

    Fideler, Elizabeth F., Ed.; Bazer, Gerald, Ed.

    Second in an annual series, this volume presents brief descriptions of a number of outstanding community college instructional programs identified by the National Council of Instructional Administrators (NCIA). Each description includes the address and telephone number of the college in which the program operates, and the names of the college…

  16. An Evaluation of Milwaukee Area Technical College District. Report.

    ERIC Educational Resources Information Center

    Wade, Kate; Monroe, Kellie; Bajkiewicz, David; Coulthart, Tim; Osmanski, Thomas; Smyth, Conor; Sommerfeld, Robert

    The Legislative Audit Bureau of the State of Wisconsin analyzed financial issues concerning the Milwaukee Area Technical College (MATC). The MATC District is the largest district in Wisconsin's technical college system, with 12,504 FTE students enrolled and 1,944 staff in the 2001-02 academic year. Operating expenses for that year were $152.0…

  17. Employee Turnover in Christian College/University Admissions

    ERIC Educational Resources Information Center

    Dougherty, Kevin D.; Andrews, Megan

    2007-01-01

    Few campus offices bear the weight of organizational health and vitality more directly than college and university admissions offices. This is particularly true for Christian colleges and universities where annual operating budgets depend largely on student tuition dollars. The purpose of the research reported in this paper was to explore rates…

  18. Financial Statement Audit Report of Tri-County Community College.

    ERIC Educational Resources Information Center

    Campbell, Ralph

    This report presents the results of the Tri-County Community College financial statement audit for the fiscal year ending on June 30, 1998. Tri-County Community College is a component of the State of North Carolina, thus the authority to audit is granted by Article 5A of G.S. 147. The accounts and operations of the institution were subject to…

  19. Financial Statement Audit Report of Randolph Community College.

    ERIC Educational Resources Information Center

    Campbell, Ralph

    This report presents the results of the Randolph Community College financial statement audit for the fiscal year ending on June 30, 1998. Randolph Community College is a component of the State of North Carolina, thus the authority to audit is granted by Article 5A of G.S. 147. The accounts and operations of the institution were subject to audit…

  20. Financial Statement Audit Report of Isothermal Community College.

    ERIC Educational Resources Information Center

    Campbell, Ralph

    This report presents the results of the Isothermal Community College financial statement audit for the fiscal year ending on June 30, 1998. Isothermal Community College is a component of the State of North Carolina, thus the authority to audit is granted by Article 5A of G.S. 147. The accounts and operations of the institution were subject to…

  1. Financial Statement Audit Report of Halifax Community College.

    ERIC Educational Resources Information Center

    Campbell, Ralph

    This report presents the results of the Halifax Community College financial statement audit for the fiscal year ending on June 30, 1998. Halifax Community College is a component of the State of North Carolina, thus the authority to audit is granted by Article 5A of G.S. 147. The accounts and operations of the institution were subject to audit…

  2. Financial Statement Audit Report of Guilford Technical Community College.

    ERIC Educational Resources Information Center

    Campbell, Ralph

    This report presents the results of the Guilford Technical Community College financial statement audit for the fiscal year ending on June 30, 1998. Guilford Technical Community College is a component of the State of North Carolina, thus the authority to audit is granted by Article 5A of G.S. 147. The accounts and operations of the institution were…

  3. Financial Statement Audit Report of Rockingham Community College.

    ERIC Educational Resources Information Center

    Campbell, Ralph

    This report presents the results of the Rockingham Community College financial statement audit for the fiscal year ending on June 30, 1998. Rockingham Community College is a component of the State of North Carolina, thus the authority to audit is granted by Article 5A of G.S. 147. The accounts and operations of the institution were subject to…

  4. Financial Statement Audit Report of Pamlico Community College.

    ERIC Educational Resources Information Center

    Campbell, Ralph

    This report presents the results of the Pamlico Community College financial statement audit for the fiscal year ending on June 30, 1998. Pamlico Community College is a component of the State of North Carolina, thus the authority to audit is granted by Article 5A of G.S. 147. The accounts and operations of the institution were subject to audit…

  5. With Dwindling Resources, Colleges Recalibrate Fund-Raising Staffs

    ERIC Educational Resources Information Center

    Masterson, Kathryn

    2009-01-01

    After several years of aggressive hiring, some college fund-raising operations are now cutting back as both revenue and investment income fall. The regrouping could slow growth plans on many campuses at a time when the need for private support has never been greater. Often the colleges cutting employees are laying off back-office staff members and…

  6. Traditional Knowledge: An Implementation Workplan for Aurora College.

    ERIC Educational Resources Information Center

    Aurora Coll., Fort Smith (Northwest Territories).

    Prepared as part of an effort to make Aurora College, in the Northwest Territories, Canada, more responsive to the Native American communities that form its primary student base, this plan outline strategies for infusing traditional knowledge into the college's day-to-day operations. Following introductory sections describing traditional knowledge…

  7. A Model for Long Range Planning for Seminole Community College.

    ERIC Educational Resources Information Center

    Miner, Norris

    A model for long-range planning designed to maximize involvement of college personnel, to improve communication among various areas of the college, to provide a process for evaluation of long-range plans and the planning process, to adjust to changing conditions, to utilize data developed at a level useful for actual operations, and to have…

  8. Colleges and Institutes: Advanced Skills for the Health Sector

    ERIC Educational Resources Information Center

    Association of Canadian Community Colleges, 2010

    2010-01-01

    This report provides the recommendations made by the Association of Canadian Community Colleges (ACCC) to the House of Commons Standing Committee on Health based from its examination on the health and human resources issues in Canada. Colleges are the advanced skills educators of choice. Aligned with the needs of employers, and operating on the…

  9. State of the District [Los Angeles Community College District].

    ERIC Educational Resources Information Center

    Koltai, Leslie

    Accomplishments made by the Los Angeles Community College District during its fifth year of independent operation are noted, and 10 projects to receive attention during the coming year are listed. The accomplishments are: (1) increasing and diversifying enrollment, (2) stabilizing and improving the college environment, (3) developing fiscal…

  10. Community Colleges in the Commonwealth; A Report of a Survey.

    ERIC Educational Resources Information Center

    Blee, Myron R.; And Others

    Since the Kentucky community college network has been in operation for several years, it was felt that a study of the current status and dimensions of that network would be useful in developing guidelines for future development. After visits to each of the schools and study of related data, it was noted that the community colleges are closely…

  11. A survey of natural aggregate properties and characteristics important in remote sensing and airborne geophysics

    USGS Publications Warehouse

    Knepper, D.H., Jr.; Langer, W.H.; Miller, S.

    1995-01-01

    Natural aggregate is vital to the construction industry. Although natural aggregate is a high volume/low value commodity that is abundant, new sources are becoming increasingly difficult to find and develop because of rigid industry specifications, political considerations, development and transportation costs, and environmental concerns. There are two primary sources of natural aggregate: (1) exposed or near-surface bedrock that can be crushed, and (2) deposits of sand and gravel. Remote sensing and airborne geophysics detect surface and near-surface phenomena, and may be useful for detecting and mapping potential aggregate sources; however, before a methodology for applying these techniques can be developed, it is necessary to understand the type, distribution, physical properties, and characteristics of natural aggregate deposits. The distribution of potential aggregate sources is closely tied to local geologic history. Conventional exploration for natural aggregate deposits has been largely a ground-based operation, although aerial photographs and topographic maps have been extensively used to target possible deposits. Today, the exploration process also considers factors such as the availability of the land, space and water supply for processing, political and environmental factors, and distance from the market; exploration and planning cannot be separated. There are many physical properties and characteristics by which to judge aggregate material for specific applications; most of these properties and characteristics pertain only to individual aggregate particles. The application of remote sensing and airborne geophysical measurements to detecting and mapping potential aggregate sources, however, is based on intrinsic bulk physical properties and extrinsic characteristics of the deposits that can be directly measured, mathematically derived from measurement, or interpreted with remote sensing and geophysical data. ?? 1995 Oxford UniversityPress.

  12. Classification and Characterization of Therapeutic Antibody Aggregates

    PubMed Central

    Joubert, Marisa K.; Luo, Quanzhou; Nashed-Samuel, Yasser; Wypych, Jette; Narhi, Linda O.

    2011-01-01

    A host of diverse stress techniques was applied to a monoclonal antibody (IgG2) to yield protein particles with varying attributes and morphologies. Aggregated solutions were evaluated for percent aggregation, particle counts, size distribution, morphology, changes in secondary and tertiary structure, surface hydrophobicity, metal content, and reversibility. Chemical modifications were also identified in a separate report (Luo, Q., Joubert, M. K., Stevenson, R., Narhi, L. O., and Wypych, J. (2011) J. Biol. Chem. 286, 25134–25144). Aggregates were categorized into seven discrete classes, based on the traits described. Several additional molecules (from the IgG1 and IgG2 subtypes as well as intravenous IgG) were stressed and found to be defined with the same classification system. The mechanism of protein aggregation and the type of aggregate formed depends on the nature of the stress applied. Different IgG molecules appear to aggregate by a similar mechanism under the same applied stress. Aggregates created by harsh mechanical stress showed the largest number of subvisible particles, and the class generated by thermal stress displayed the largest number of visible particles. Most classes showed a disruption of the higher order structure, with the degree of disorder depending on the stress process. Particles in all classes (except thermal stress) were at least partially reversible upon dilution in pH 5 buffer. High copper content was detected in isolated metal-catalyzed aggregates, a stress previously shown to produce immunogenic aggregates. In conclusion, protein aggregates can be a very heterogeneous population, whose qualities are the result of the type of stress that was experienced. PMID:21454532

  13. Aggregated Residential Load Modeling Using Dynamic Bayesian Networks

    SciTech Connect

    Vlachopoulou, Maria; Chin, George; Fuller, Jason C.; Lu, Shuai

    2014-09-28

    Abstract—It is already obvious that the future power grid will have to address higher demand for power and energy, and to incorporate renewable resources of different energy generation patterns. Demand response (DR) schemes could successfully be used to manage and balance power supply and demand under operating conditions of the future power grid. To achieve that, more advanced tools for DR management of operations and planning are necessary that can estimate the available capacity from DR resources. In this research, a Dynamic Bayesian Network (DBN) is derived, trained, and tested that can model aggregated load of Heating, Ventilation, and Air Conditioning (HVAC) systems. DBNs can provide flexible and powerful tools for both operations and planing, due to their unique analytical capabilities. The DBN model accuracy and flexibility of use is demonstrated by testing the model under different operational scenarios.

  14. What Good Is College? The Economics of College Attendance

    ERIC Educational Resources Information Center

    Covaleskie, John F.

    2014-01-01

    Until relatively recently, college was for only the few, and only loosely related to economic success. College graduates have always done economically better, on average, than those who did not graduate from college, but that was mostly because only the well-to-do could afford college. Few attended college in the hope of economic advancement in…

  15. Public versus Private Colleges: Political Participation of College Graduates

    ERIC Educational Resources Information Center

    Lott, Joe L., II.; Hernandez, Jose; King, Joe P.; Brown, Tiffany; Fajardo, Ismael

    2013-01-01

    Using data from the Baccalaureate and Beyond Longitudinal Study (B&B:93/03) of College Graduates, we use structural equation modeling to model the relationships between college major, values held in college, collegiate community service participation, and the post-college political participation of college graduates by public versus private…

  16. The fractal aggregation of asphaltenes.

    PubMed

    Hoepfner, Michael P; Fávero, Cláudio Vilas Bôas; Haji-Akbari, Nasim; Fogler, H Scott

    2013-07-16

    This paper discusses time-resolved small-angle neutron scattering results that were used to investigate asphaltene structure and stability with and without a precipitant added in both crude oil and model oil. A novel approach was used to isolate the scattering from asphaltenes that are insoluble and in the process of aggregating from those that are soluble. It was found that both soluble and insoluble asphaltenes form fractal clusters in crude oil and the fractal dimension of the insoluble asphaltene clusters is higher than that of the soluble clusters. Adding heptane also increases the size of soluble asphaltene clusters without modifying the fractal dimension. Understanding the process of insoluble asphaltenes forming fractals with higher fractal dimensions will potentially reveal the microscopic asphaltene destabilization mechanism (i.e., how a precipitant modifies asphaltene-asphaltene interactions). It was concluded that because of the polydisperse nature of asphaltenes, no well-defined asphaltene phase stability envelope exists and small amounts of asphaltenes precipitated even at dilute precipitant concentrations. Asphaltenes that are stable in a crude oil-precipitant mixture are dispersed on the nanometer length scale. An asphaltene precipitation mechanism is proposed that is consistent with the experimental findings. Additionally, it was found that the heptane-insoluble asphaltene fraction is the dominant source of small-angle scattering in crude oil and the previously unobtainable asphaltene solubility at low heptane concentrations was measured. PMID:23808932

  17. Anisotropic diffusion-limited aggregation.

    PubMed

    Popescu, M N; Hentschel, H G E; Family, F

    2004-06-01

    Using stochastic conformal mappings, we study the effects of anisotropic perturbations on diffusion-limited aggregation (DLA) in two dimensions. The harmonic measure of the growth probability for DLA can be conformally mapped onto a constant measure on a unit circle. Here we map m preferred directions for growth to a distribution on the unit circle, which is a periodic function with m peaks in [-pi,pi) such that the angular width sigma of the peak defines the "strength" of anisotropy kappa= sigma(-1) along any of the m chosen directions. The two parameters (m,kappa) map out a parameter space of perturbations that allows a continuous transition from DLA (for small enough kappa ) to m needlelike fingers as kappa--> infinity. We show that at fixed m the effective fractal dimension of the clusters D(m,kappa) obtained from mass-radius scaling decreases with increasing kappa from D(DLA) approximately 1.71 to a value bounded from below by D(min) = 3 / 2. Scaling arguments suggest a specific form for the dependence of the fractal dimension D(m,kappa) on kappa for large kappa which compares favorably with numerical results. PMID:15244564

  18. Aggregate Models of Climate Change

    NASA Astrophysics Data System (ADS)

    Hooss, G.; Voss, R.; Hasselmann, K.; Maier-Reimer, E.; Joos, F.

    Integrated assessment of climate change generally requires the evaluation of many transient scenario simulations of century-timescale changes in atmospheric compo- sition and climate, desirably with the accuracy of state-of-the-art three-dimensional (3D) coupled atmosphere-ocean general circulation models (GCMs). Such multi- scenario GCM computations are possible through appropriate representation of the models in aggregate forms. For this purpose, we developed Nonlinear Impulse- response projections of 3D models of the global (oceanic and terrestrial) Carbon cycle and the atmosphere-ocean Climate System (NICCS). For higher CO2 forcing, appli- cability is extended beyond the linear response domain through explicit treatment of dominant nonlinear effects. The climate change module was furthermore augmented with spatial patterns of change in some of the most impact-relevant fields. Applied to three long-term CO2 emission scenarios, the model demonstrates (a) the minor rela- tive role of the terrestrial carbon sink through CO2 fertilization, and (b) the necessity to reduce fossil carbon emissions to a very small fraction of today's rates within the next few decades if a major climate change is to be avoided.

  19. Community College Financing: Strategies and Challenges. New Expeditions: Charting the Second Century of Community Colleges. Issues Paper No. 5.

    ERIC Educational Resources Information Center

    Merisotis, Jamie P.; Wolanin, Thomas R.

    This paper addresses the current context and general trends in community college financing. Financing of community colleges is becoming increasingly based on contracted government and private programs, as operating funds from state and local tax coffers decrease. More and more, students are being asked to pick up a larger portion of the tab.…

  20. Commercial Demonstration of the Manufactured Aggregate Processing Technology Utilizing Spray Dryer Ash

    SciTech Connect

    Milton Wu; Paul Yuran

    2006-12-31

    Universal Aggregates LLC (UA) was awarded a cost sharing Co-operative Agreement from the Department of Energy (DOE) through the Power Plant Improvement Initiative Program (PPII) to design, construct and operate a lightweight aggregate manufacturing plant at the Birchwood Power Facility in King George, Virginia in October 2001. The Agreement was signed in November 2002. The installation and start-up expenses for the Birchwood Aggregate Facility are $19.5 million. The DOE share is $7.2 million (37%) and the UA share is $12.3 million (63%). The original project team consists of UA, SynAggs, LLC, CONSOL Energy Inc. and P. J. Dick, Inc. Using 115,000 ton per year of spray dryer ash (SDA), a dry FGD by-product from the power station, UA will produce 167,000 tons of manufactured lightweight aggregate for use in production of concrete masonry units (CMU). Manufacturing aggregate from FGD by-products can provide an economical high-volume use and substantially expand market for FGD by-products. Most of the FGD by-products are currently disposed of in landfills. Construction of the Birchwood Aggregate Facility was completed in March 2004. Operation startup was begun in April 2004. Plant Integration was initiated in December 2004. Integration includes mixing, extrusion, curing, crushing and screening. Lightweight aggregates with proper size gradation and bulk density were produced from the manufacturing aggregate plant and loaded on a stockpile for shipment. The shipped aggregates were used in a commercial block plant for CMU production. However, most of the production was made at low capacity factors and for a relatively short time in 2005. Several areas were identified as important factors to improve plant capacity and availability. Equipment and process control modifications and curing vessel clean up were made to improve plant operation in the first half of 2006. About 3,000 tons of crushed aggregate was produced in August 2006. UA is continuing to work to improve plant

  1. Radical Education in the Rural South: Commonwealth College, 1922-1940.

    ERIC Educational Resources Information Center

    Cobb, William H.

    Commonwealth College was the longest lived and most notorious of the resident labor colleges operating during the 1920s-30s. Founded in 1923 at NewLlano Cooperative Colony in Louisiana, the school was modeled on the self-maintenance characteristics of an abortive pre-war experiment in social education: Ruskin College. Disputes over priorities with…

  2. Educating Students, Transforming Communities: Tribal Colleges Bridge Gap from Poverty to Prosperity

    ERIC Educational Resources Information Center

    Benton, Sherrole

    2012-01-01

    Tribal colleges are often performing little miracles in their communities. Most tribal colleges operate without benefit of local and state taxes. Yet, they bring in new money from other sources that stimulate the local economy. Students gain knowledge and skills that can transform their communities and local economies. Tribal colleges not only…

  3. Online Workforce Development in Community Colleges: Connection with Community, Institutional, and Governance Factors

    ERIC Educational Resources Information Center

    Githens, Rod Patrick; Sauer, Timothy M.; Crawford, Fashaad L.; Cumberland, Denise M.; Wilson, Kristin B.

    2014-01-01

    This study examined community and institutional factors that influence offering online workforce development programs in community colleges. The study included a random sample of 321 community college in the United States. Findings conclude that colleges operating under statewide governance structures and in states with more highly centralized…

  4. A Decision-Making Analysis of Fund Raising Options in a Public Community College.

    ERIC Educational Resources Information Center

    Chitwood, James P.

    Because financial stability of colleges and universities is threatened by level or decreased funding from all government sources, private resource development looms as a crucial element of community college operations in the next century. In order to determine the optimal private sources to target, Okaloosa-Walton Community College (OWCC), in…

  5. Organizational Adaptation of Liberal Arts Colleges during the Great Recession of 2007

    ERIC Educational Resources Information Center

    Hilbun, Ashlie Junot; Mamiseishvili, Ketevan

    2016-01-01

    The study we report here explored how private liberal arts colleges adapted to the Great Recession of 2007. We examined institutional changes at three private liberal arts colleges and their effects on the institutions' operations. For this multiple-case study we analyzed data from three colleges in the southeastern region of the United States;…

  6. Student Guide for Documenting Experiential Learning: Travel Agency Operation.

    ERIC Educational Resources Information Center

    Coastline Community Coll., Fountain Valley, CA.

    Coastline Community College has developed a series of guides to assist adults who wish to obtain college credit or advanced standing in evaluating and verifying their non-college learning experiences. This guide lists the competency requirements of four courses within the Travel Agency Operation program: Domestic Air Transportation; International…

  7. Can intra-aggregate pore structures affect the aggregate's effectiveness in protecting carbon?

    SciTech Connect

    Ananyeva, K; Wang, W; Smucker, A J.M.; Rivers, M L; Kravchenko, A N

    2012-11-15

    Aggregates are known to provide physical protection to soil organic matter shielding it from rapid decomposition. Spatial arrangement and size distribution of intra-aggregate pores play an important role in this process. This study examined relationships between intra-aggregate pores measured using X-ray computed micro-tomography images and concentrations of total C in 4–6 mm macro-aggregates from two contrasting land use and management practices, namely, conventionally tilled and managed row crop agricultural system (CT) and native succession vegetation converted from tilled agricultural land in 1989 (NS). Previous analyses of these aggregates indicated that small (<15 μm) and large (>100 μm) pores prevail in NS aggregates while medium (30–90 μm) pores are more abundant in CT aggregates (Kravchenko et al., 2011; Wang et al., 2012). We hypothesized that these differences in pore size distributions affect the ability of macro-aggregates to protect C. The results of this study supported this hypothesis. Consistent with greater heterogeneity of pore distributions within NS aggregates we observed higher total C and greater intra-aggregate C variability in NS as compared with CT aggregates. Total C concentrations and intra-aggregate C standard deviations were negatively correlated with fractions of medium sized pores, indicating that presence of such pores was associated with lower but more homogeneously distributed total C. While total C was positively correlated with presence of small and large pores. The results suggest that because of their pore structure NS macro-aggregates provide more effective physical protection to C than CT aggregates.

  8. Space Costing: Who Should Pay for the Use of College Space? A Report.

    ERIC Educational Resources Information Center

    Zacher, Sy

    The costs of owning and operating physical facilities are consuming an increasing share of the budgets of colleges and universities. In the past, academic and operating units of colleges have viewed their space as a free commodity and often used it extravagantly. Space costing is a method of cost accounting the space and operating and maintenance…

  9. Collision simulation of sintered dust aggregates

    NASA Astrophysics Data System (ADS)

    Sirono, Sin-iti; Ueno, Haruta

    Collisional evolution of dust aggregates is the initial process of the planet formation. Sticking velocity, below which collisional sticking of an aggregate happens, is a crucial quantity in the collisional evolution. In the standard model of protoplanetary nebula, the maximum collisional velocity is around 50m/s. Therefore, if a planetesimal is formed through direct collisional sticking, the sticking velocity should be higher than 50m/s. Even if a planetesimal is formed by other mechanism such as anticyclonic vortices, substantial growth of an aggregate is required because the motion of an aggregate should be decoupled from that of gas. Collisional simulation of icy dust aggregates (Wada et al. 2009, ApJ 702, 1490) showed that the sticking velocity was larger than 50m/s and planetesimal formation by collisional sticking was possible. However, sintering of ice proceeds in a wide area of a protoplanetary nebula (Sirono 2011, ApJ 765, 50). Sintering enlarges a neck, connection between adjacent dust grains, and changes the mechanical properties of a dust aggregate. Here we performed collisional simulations between sintered dust aggregates taking account of sintering. We found that the sticking velocity was decreased substantially down to 20m/s. This result suggests that a planetesimal is not formed by direct collisional sticking and that the planetesimal formation proceeded in particular regions in a protoplanetary nebula.

  10. Local aggregation characteristics of microscale blood flows

    NASA Astrophysics Data System (ADS)

    Kaliviotis, Efstathios; Sherwood, Joseph M.; Dusting, Jonathan; Balabani, Stavroula

    2015-11-01

    Erythrocyte aggregation (EA) is an important aspect of microvascular flows affecting blood flow and viscosity. Microscale blood flows have been studied extensively in recent years using computational and microfluidic based approaches. However, the relationship between the local structural characteristics of blood and the velocity field has not been quantified. We report simultaneous measurements of the local velocity, aggregation and haematocrit distributions of human erythrocytes flowing in a microchannel. EA was induced using Dextran and flows were imaged using brightfield microscopy. Local aggregation characteristics were investigated using statistical and edge-detection image processing techniques while velocity profiles were obtained using PIV algorithms. Aggregation intensity was found to strongly correlate with local variations in velocity in both the central and wall regions of the channel. The edge detection method showed that near the side wall large aggregates are associated with high local velocities and low local shear rates. In the central region large aggregates occurred in regions of low velocity and high erythrocyte concentration. The results demonstrate the combined effect of haematocrit and velocity distributions on local aggregation characteristics.

  11. Parameters of Multiple College Attendance.

    ERIC Educational Resources Information Center

    Dillon, Paul H.

    This is a report analyzing the multiple community college attendance patterns of students from nine colleges in the Los Angeles Community College District (California) from 1990-2000. The assessment utilizes the Multiple College Index (MCI), which is a measure based on the proportion of units a student earns at different colleges. The study…

  12. Generation and Exploitation of Aggregation Abstractions for Scheduling and Resource Allocation

    NASA Technical Reports Server (NTRS)

    Linden, Theodore A.; Lowry, Michael R.

    1992-01-01

    Our research is investigating abstraction of computational theories for scheduling and resource allocation. These theories are represented in a variant of first order predicate calculus, parameterized multisorted logic, that facilitates specification of large problems. A particular problem is conceptually stated as a set of ground sentences that are consistent with a quantified theory. We are mainly investigating the automated generation of aggregation abstractions and approximations in which detailed resource allocation constraints are replaced by constraints between aggregate demand and capacity. We are also investigating the interaction of aggregation abstractions with the more thoroughly investigated abstractions of weakening operator preconditions. The purpose of the theories for aggregated demand/capacity is threefold: first, to answer queries about aggregate properties, such as gross feasibility; second, to reduce computational costs by using the solution of aggregate problems to guide the solution of detailed problems; and third, to facilitate reformulating theories to approximate problems for which there are efficient problem solving methods. We also describe novel methods for exploiting aggregation abstractions.

  13. Generation and exploration of aggregation abstractions for scheduling and resource allocation

    NASA Technical Reports Server (NTRS)

    Lowry, Michael R.; Linden, Theodore A.

    1993-01-01

    This paper presents research on the abstraction of computational theories for scheduling and resource allocation. The paper describes both theory and methods for the automated generation of aggregation abstractions and approximations in which detailed resource allocation constraints are replaced by constraints between aggregate demand and capacity. The interaction of aggregation abstraction generation with the more thoroughly investigated abstractions of weakening operator preconditions is briefly discussed. The purpose of generating abstract theories for aggregated demand and resources includes: answering queries about aggregate properties, such as gross feasibility; reducing computational costs by using the solution of aggregate problems to guide the solution of detailed problems; facilitating reformulating theories to approximate problems for which there are efficient problem-solving methods; and reducing computational costs of scheduling by providing more opportunities for variable and value-ordering heuristics to be effective. Experiments are being developed to characterize the properties of aggregations that make them cost effective. Both abstract and concrete theories are represented in a variant of first-order predicate calculus, which is a parameterized multi-sorted logic that facilitates specification of large problems. A particular problem is conceptually represented as a set of ground sentences that is consistent with a quantified theory.

  14. Exciton dynamics in perturbed vibronic molecular aggregates

    PubMed Central

    Brüning, C.; Wehner, J.; Hausner, J.; Wenzel, M.; Engel, V.

    2015-01-01

    A site specific perturbation of a photo-excited molecular aggregate can lead to a localization of excitonic energy. We investigate this localization dynamics for laser-prepared excited states. Changing the parameters of the electric field significantly influences the exciton localization which offers the possibility for a selective control of this process. This is demonstrated for aggregates possessing a single vibrational degree of freedom per monomer unit. It is shown that the effects identified for the molecular dimer can be generalized to larger aggregates with a high density of vibronic states. PMID:26798840

  15. On aggregation in spatial econometric modelling

    NASA Astrophysics Data System (ADS)

    Paelinck, Jean H. P.

    The spatial aggregation problem - also termed the modifiable areal unit problem - has attracted regular attention in spatial statistics and econometrics. In this study econometric aggregation analysis is used to investigate the formal composition of meso-areal parameters given micro-areal underlying relations with spatial dependence. Impact on stochastic terms (possible meso-areal spatial autocorrelation) is also studied. Finally consequences for meso-areal estimation are derived, the general finding having been that spatial aggregation leads to meso-region specific parameter values, with the estimation problems this implies.

  16. Aggregation of ice crystals in cirrus

    NASA Technical Reports Server (NTRS)

    Kajikawa, Masahiro; Heymsfield, Andrew J.

    1989-01-01

    Results are given from analysis of the aggregation of thick plate, columnar, and bullet rosette ice crystals in cirrus. Data were obtained from PMS 2D-C images, oil coated slides, and aircraft meteorological measurements. Crystal size ranged from 100 to 900 microns in temperatures from -30 to -45 C. The results indicate that the ratio of the sizes of aggregating crystals and the difference of their terminal velocities are important in aggregation. The collection efficiency was calculated for the thick plate crystals from the same data.

  17. Directional sensing and streaming in Dictyostelium aggregation

    NASA Astrophysics Data System (ADS)

    Almeida, Sofia; Dilão, Rui

    2016-05-01

    We merge the Kessler-Levine simple discrete model for Dictyostelium cyclic adenosine monophosphate (cAMP) production and diffusion with the Dilão-Hauser directional sensing aggregation mechanism. The resulting compound model describes all the known transient patterns that emerge during Dictyostelium aggregation, which include the spontaneous formation of cAMP self-sustained target and spiral waves and streaming. We show that the streaming patterns depend on the speed of the amoebae, on the relaxation time for the production of cAMP, on the cAMP degradation rate, and on directional sensing. Moreover, we show that different signaling centers emerge during Dictyostelium aggregation.

  18. Antiplatelet aggregation principles from Ephemerantha lonchophylla.

    PubMed

    Chen, C C; Huang, Y L; Teng, C M

    2000-05-01

    Bioactivity-directed separation led to the identification of four compounds, viz. denbinobin (1), 3,7-dihydroxy-2,4-dimethoxyphenanthrene (2), 3-methylgigantol (3), and erianthridin (4) from the ethanolic extract of Ephemerantha lonchophylla. Antiplatelet tests were carried out using 4 different aggregation inducers, viz. arachidonic acid (AA), thrombin, collagen and platelet activating factor (PAF). The results indicated that only compounds 2, 3, and 4 exhibited generally significant anti-aggregation activities with that against AA-induced aggregation being most effective. Estimated IC50, values in this regard for 2, 3, and 4 were 24 microM, 30 microM and 9 microM, respectively. PMID:10865460

  19. A look at construction aggregates production

    USGS Publications Warehouse

    Willett, Jason Christopher

    2009-01-01

    Construction aggregates are defined as the combination of crushed stone and construction sand and gravel. Aggregates are one of the most accessible natural resources on Earth and one of the fundamental building blocks of our society. They have been used from the earliest times of our civilization for a variety of applications that have increased in number and complexity with time and technological progress. Despite the relatively low but increasing unit value of its basic products, the construction aggregates industry is a major contributor to and an indicator of the economic well-being of the nation.

  20. Exciton dynamics in perturbed vibronic molecular aggregates.

    PubMed

    Brüning, C; Wehner, J; Hausner, J; Wenzel, M; Engel, V

    2016-07-01

    A site specific perturbation of a photo-excited molecular aggregate can lead to a localization of excitonic energy. We investigate this localization dynamics for laser-prepared excited states. Changing the parameters of the electric field significantly influences the exciton localization which offers the possibility for a selective control of this process. This is demonstrated for aggregates possessing a single vibrational degree of freedom per monomer unit. It is shown that the effects identified for the molecular dimer can be generalized to larger aggregates with a high density of vibronic states. PMID:26798840

  1. Creep of dry clinopyroxene aggregates

    NASA Astrophysics Data System (ADS)

    Bystricky, Misha; Mackwell, Stephen

    2001-01-01

    We have determined diffusional and dislocation creep rheologies for clinopyroxenite Ca1.0Mg0.8Fe0.2Si2O6 under dry conditions by deforming natural and hot-pressed samples at confining pressures of 300-430 MPa and temperatures of 1100°-1250°C with the oxygen fugacity buffered by either nickel-nickel oxide or iron-wüstite powders. The coarse-grained natural Sleaford Bay clinopyroxenite yielded a stress exponent of n = 4.7 ± 0.2 and an activation energy for creep of Q = 760 ± 40 kJ mol-1, consistent with deformation in the dislocation creep regime. The strength of the natural clinopyroxenite is consistent with previous high-temperature measurements of dislocation creep behavior of Sleaford Bay clinopyroxenite by Kirby and Kronenberg [1984] and Boland and Tullis [1986]. Fine-grained clinopyroxenite was prepared from ground powders of the natural clinopyroxenite. Hot-pressed samples were deformed under similar conditions to the natural samples. Mixed-mode deformation behavior was observed, with diffusional creep (n = 1) at lower differential stresses and dislocation creep (with n and Q similar to those of the natural samples) at higher differential stresses. Within the dislocation creep field the predried hot-pressed samples generally yielded creep rates that were about an order of magnitude faster than the natural samples. Thus, even at the highest differential stresses, a component of strain accommodation by grain boundary diffusion was present in the hot-pressed samples. Optical and electron microscope investigations of the deformation microstructures of the natural and hot-pressed samples show evidence for mechanical twinning and activation of dislocation slip systems. When extrapolated to geological conditions expected in the deep crust and upper mantle on Earth and other terrestrial planets, the strength of dry single-phase clinopyroxene aggregates is very high, exceeding that of dry olivine-rich rocks.

  2. Metal concentrations in aggregate interiors, exteriors, whole aggregates, and bulk of Costa Rican soils

    SciTech Connect

    Wilcke, W.; Kretzschmar, S.; Bundt, M.; Zech, W.

    1999-10-01

    In many temperate soils the preferential weathering and leaching of aggregate surfaces and the nonaggregated material between aggregates depletes geogenic metals. It also shifts metals from strongly to more weakly bound metal forms. Deposited metals are sorbed preferentially on aggregate surfaces and between aggregates. The authors examined whether preferential desilication under tropical climate causes an enrichment in the aggregate exteriors in oxidic forms of metals. They also studied where deposited metals are bound in these soils. Aggregates (2--20 mm) were selected manually from the A horizons of eight Oxisols, six Andisols, two Mollisols, and two Inceptisols in Costa Rica. All samples were fractionated into interior and exterior portions and treated with a seven-step sequence to extract Al, Cd, Cu, Fe, Mn, Pb, and Zn. Total concentrations of all metals except Zn were higher in the aggregate exteriors than in the interiors. The average Cd and Pb concentrations in easily extractable fractions were significantly higher in the aggregate exteriors. There were no significant differences in metal partitioning between interiors and exteriors except for Pb, which had higher proportions in extractable forms with NH{sub 2}OH {center{underscore}dot} HCl {gt} NH{sub 4} - acetate, pH 6.0 {gt} EDTA in the exteriors. There were few significant differences in metal concentrations and partitioning between bulk soil and whole aggregates. The results may be explained by (i) preferential desilication of the aggregate exteriors and (ii) preferential sorption of deposited heavy metals mainly in easily extractable forms.

  3. Relationship between the initial rate of protein aggregation and the lag period for amorphous aggregation.

    PubMed

    Borzova, Vera A; Markossian, Kira A; Kurganov, Boris I

    2014-07-01

    Lag period is an inherent characteristic of the kinetic curves registered for protein aggregation. The appearance of a lag period is connected with the nucleation stage and the stages of the formation of folding or unfolding intermediates prone to aggregation (for example, the stage of protein unfolding under stress conditions). Discovering the kinetic regularities essential for elucidation of the protein aggregation mechanism comprises deducing the relationship between the lag period and aggregation rate. Fändrich proposed the following equation connecting the duration of the lag phase (tlag) and the aggregate growth rate (kg) in the amyloid fibrillation: kg=const/tlag. To establish the relationship between the initial rate of protein aggregation (v) and the lag period (t0) in the case of amorphous aggregation, the kinetics of dithithreitol-induced aggregation of holo-α-lactalbumin from bovine milk was studied (0.1M Na-phosphate buffer, pH 6.8; 37°C). The order of aggregation with respect to protein (n) was calculated from the dependence of the initial rate of protein aggregation on the α-lactalbumin concentration (n=5.3). The following equation connecting v and t0 has been proposed: v(1/n)=const/(t0-t0,lim), where t0,lim is the limiting value of t0 at high concentrations of the protein. PMID:24794200

  4. Aggregate structure, morphology and the effect of aggregation mechanisms on viscosity at elevated protein concentrations.

    PubMed

    Barnett, Gregory V; Qi, Wei; Amin, Samiul; Neil Lewis, E; Roberts, Christopher J

    2015-12-01

    Non-native aggregation is a common issue in a number of degenerative diseases and during manufacturing of protein-based therapeutics. There is a growing interest to monitor protein stability at intermediate to high protein concentrations, which are required for therapeutic dosing of subcutaneous injections. An understanding of the impact of protein structural changes and interactions on the protein aggregation mechanisms and resulting aggregate size and morphology may lead to improved strategies to reduce aggregation and solution viscosity. This report investigates non-native aggregation of a model protein, α-chymotrypsinogen, under accelerated conditions at elevated protein concentrations. Far-UV circular dichroism and Raman scattering show structural changes during aggregation. Size exclusion chromatography and laser light scattering are used to monitor the progression of aggregate growth and monomer loss. Monomer loss is concomitant with increased β-sheet structures as monomers are added to aggregates, which illustrate a transition from a native monomeric state to an aggregate state. Aggregates grow predominantly through monomer-addition, resulting in a semi-flexible polymer morphology. Analysis of aggregation growth kinetics shows that pH strongly affects the characteristic timescales for nucleation (τn) and growth (τg), while the initial protein concentration has only minor effects on τn or τg. Low-shear viscosity measurements follow a common scaling relationship between average aggregate molecular weight (Mw(agg)) and concentration (σ), which is consistent with semi-dilute polymer-solution theory. The results establish a link between aggregate growth mechanisms, which couple Mw(agg) and σ, to increases in solution viscosity even at these intermediate protein concentrations (less than 3w/v %). PMID:26284891

  5. Some Colleges Use Undercover Stings To Stop Drug Sales.

    ERIC Educational Resources Information Center

    Lively, Kit

    1998-01-01

    Increasingly, college and universities are allowing undercover police operations to halt drug trafficking involving students, hoping to break supply chains and convey the message that the institution takes drug policy seriously. Many students find the intrusion disturbing. (MSE)

  6. Soil aggregate stability: comparison of field and laboratory data

    NASA Astrophysics Data System (ADS)

    Graf, Frank

    2014-05-01

    Eco-engineering first and foremost, aims at stabilising soil and slopes in order to protect humans and infrastructure from potential damages caused by soil failure, usually due to heavy rainstorms. Whereas the technical constructions are well-defined and their protective effects in general calculable, this is rarely the case for biological measures. Furthermore, unlike engineering structures which are immediately useable and operative after their completion, the effects of plants are developing as a function of time. Within this scope, soil aggregation processes play a decisive role in in the re-colonisation process and the re-establishing of a protective vegetation cover. The strength of soil aggregates is not only critical to the stability of slopes but plays a key role in ecosystem functioning in general as it affects water, gas and nutrient fluxes and storage influencing the activity and growth of living organisms. Not by chance, therefore, soil aggregate stability has been proposed as an indicator reflecting multiple aspects allowing extensive information on ecosystem status to be gathered in a relatively short time, in particular in respect of protecting slopes from erosion and shallow mass movements. Various methods and approaches have been used to quantify soil aggregate stability but the lack of standardisation complicates the comparison of different investigations. From this perspective we investigated soil samples from the field as well as samples artificially prepared in the laboratory using the same soil material and testing procedure. The field samples were collected at two sites in the landslide area of Dallenwil-Wirzweli in Central Switzerland, once in a gully recently affected by erosion and landslide processes bare of vegetation (control site) and once in a re-stabilised gully with 25 year old eco-engineering measures dominated by Alnus incana (re-vegetated site). The laboratory samples were prepared with the soil from the control site. Two

  7. Network Intrusion Detection and Visualization using Aggregations in a Cyber Security Data Warehouse

    SciTech Connect

    Czejdo, Bogdan; Ferragut, Erik M; Goodall, John R; Laska, Jason A

    2012-01-01

    The challenge of achieving situational understanding is a limiting factor in effective, timely, and adaptive cyber-security analysis. Anomaly detection fills a critical role in network assessment and trend analysis, both of which underlie the establishment of comprehensive situational understanding. To that end, we propose a cyber security data warehouse implemented as a hierarchical graph of aggregations that captures anomalies at multiple scales. Each node of our pro-posed graph is a summarization table of cyber event aggregations, and the edges are aggregation operators. The cyber security data warehouse enables domain experts to quickly traverse a multi-scale aggregation space systematically. We describe the architecture of a test bed system and a summary of results on the IEEE VAST 2012 Cyber Forensics data.

  8. College Drinking - Changing the Culture

    MedlinePlus

    ... about college alcohol policies College Drinking - Changing the Culture This is your one-stop resource for comprehensive ... More about special features College Drinking - Changing the Culture This is your one-stop resource for comprehensive ...

  9. College Health for Young Women

    MedlinePlus

    ... important for me to know about before I go to college? Filling out your college enrollment health ... this information with other important papers when you go to college. Your immunizations must be up-to- ...

  10. Health Care for College Students

    MedlinePlus

    ... t exercise or play through pain. Mononucleosis ("Mono") College students often worry about a disease called " mono "—also ... Additional Information: Meningococcal Disease: Information for Teens and College Students Healthy Tips for College Freshman Encouraging Teens to ...

  11. Silt-clay aggregates on Mars

    NASA Technical Reports Server (NTRS)

    Greeley, R.

    1979-01-01

    Viking observations suggest abundant silt and clay particles on Mars. It is proposed that some of these particles agglomerate to form sand size aggregates that are redeposited as sandlike features such as drifts and dunes. Although the binding for the aggregates could include salt cementation or other mechanisms, electrostatic bonding is considered to be a primary force holding the aggregates together. Various laboratory experiments conducted since the 19th century, and as reported here for simulated Martian conditions, show that both the magnitude and sign of electrical charges on windblown particles are functions of particle velocity, shape and composition, atmospheric pressure, atmospheric composition and other factors. Electrical charges have been measured for saltating particles in the wind tunnel and in the field, on the surfaces of sand dunes, and within dust clouds on earth. Similar, and perhaps even greater, charges are proposed to occur on Mars, which could form aggregates of silt and clay size particles

  12. Acid soluble, pepsin resistant platelet aggregating material

    SciTech Connect

    Schneider, M.D.

    1982-08-31

    Disclosed is an acid soluble, pepsin resistant, platelet aggregating material isolated from equine arterial tissue by extraction with dilute aqueous acid. The method of isolation and use to control bleeding are described. 4 figs.

  13. EFFECT OF AGGREGATION ON VIBRIO CHOLERA INACTIVATION

    EPA Science Inventory

    Extensive research has shown that microorganisms exhibit increased resistance due to clumping, aggregation, particle association or modification of antecedent growth conditions. uring the course of investigating a major waterborne V. Cholerae outbreak in Peru, U.S. EPA investigat...

  14. Active matter model of Myxococcus xanthus aggregation

    NASA Astrophysics Data System (ADS)

    Patch, Adam; Bahar, Fatmagul; Liu, Guannan; Thutupalli, Shashi; Welch, Roy; Yllanes, David; Shaevitz, Joshua; Marchetti, M. Cristina

    Myxococcus xanthus is a soil-dwelling bacterium that exhibits several fascinating collective behaviors including streaming, swarming, and generation of fruiting bodies. A striking feature of M. xanthus is that it periodically reverses its motility direction. The first stage of fruiting body formation is characterized by the aggregation of cells on a surface into round mesoscopic structures. Experiments have shown that this aggregation relies heavily on regulation of the reversal rate and local mechanical interactions, suggesting motility-induced phase separation may play an important role. We have adapted self-propelled particle models to include cell reversal and motility suppression resulting from sporulation observed in aggregates. Using 2D molecular dynamics simulations, we map the phase behavior in the space of Péclet number and local density and examine the kinetics of aggregation for comparison to experiments.

  15. Quicklime application instantly increases soil aggregate stability

    NASA Astrophysics Data System (ADS)

    Keiblinger, Katharina M.; Bauer, Lisa M.; Deltedesco, Evi; Holawe, Franz; Unterfrauner, Hans; Zehetner, Franz; Peticzka, Robert

    2016-01-01

    Agricultural intensification, especially enhanced mechanisation of soil management, can lead to the deterioration of soil structure and to compaction. A possible amelioration strategy is the application of (structural) lime. In this study, we tested the effect of two different liming materials, ie limestone (CaCO3) and quicklime (CaO), on soil aggregate stability in a 3-month greenhouse pot experiment with three agricultural soils. The liming materials were applied in the form of pulverised additives at a rate of 2 000 kg ha-1. Our results show a significant and instantaneous increase of stable aggregates after quicklime application whereas no effects were observed for limestone. Quicklime application seems to improve aggregate stability more efficiently in soils with high clay content and cation exchange capacity. In conclusion, quicklime application may be a feasible strategy for rapid improvement of aggregate stability of fine textured agricultural soils.

  16. Aggregated Gas Molecules: Toxic to Protein?

    PubMed Central

    Zhang, Meng; Zuo, Guanghong; Chen, Jixiu; Gao, Yi; Fang, Haiping

    2013-01-01

    The biological toxicity of high levels of breathing gases has been known for centuries, but the mechanism remains elusive. Earlier work mainly focused on the influences of dispersed gas molecules dissolved in water on biomolecules. However, recent studies confirmed the existence of aggregated gas molecules at the water-solid interface. In this paper, we have investigated the binding preference of aggregated gas molecules on proteins with molecular dynamics simulations, using nitrogen (N2) gas and the Src-homology 3 (SH3) domain as the model system. Aggregated N2 molecules were strongly bound by the active sites of the SH3 domain, which could impair the activity of the protein. In contrast, dispersed N2 molecules did not specifically interact with the SH3 domain. These observations extend our understanding of the possible toxicity of aggregates of gas molecules in the function of proteins. PMID:23588597

  17. Protein aggregation and misfolding: good or evil?

    NASA Astrophysics Data System (ADS)

    Pastore, Annalisa; Temussi, Pierandrea

    2012-06-01

    Protein aggregation and misfolding have important implications in an increasing number of fields ranging from medicine to biology to nanotechnology and material science. The interest in understanding this field has accordingly increased steadily over the last two decades. During this time the number of publications that have been dedicated to protein aggregation has increased exponentially, tackling the problem from several different and sometime contradictory perspectives. This review is meant to summarize some of the highlights that come from these studies and introduce this topical issue on the subject. The factors that make a protein aggregate and the cellular strategies that defend from aggregation are discussed together with the perspectives that the accumulated knowledge may open.

  18. Diffusion-limited aggregation on curved surfaces

    NASA Astrophysics Data System (ADS)

    Choi, J.; Crowdy, D.; Bazant, M. Z.

    2010-08-01

    We develop a general theory of transport-limited aggregation phenomena occurring on curved surfaces, based on stochastic iterated conformal maps and conformal projections to the complex plane. To illustrate the theory, we use stereographic projections to simulate diffusion-limited aggregation (DLA) on surfaces of constant Gaussian curvature, including the sphere (K>0) and the pseudo-sphere (K<0), which approximate "bumps" and "saddles" in smooth surfaces, respectively. Although the curvature affects the global morphology of the aggregates, the fractal dimension (in the curved metric) is remarkably insensitive to curvature, as long as the particle size is much smaller than the radius of curvature. We conjecture that all aggregates grown by conformally invariant transport on curved surfaces have the same fractal dimension as DLA in the plane. Our simulations suggest, however, that the multifractal dimensions increase from hyperbolic (K<0) to elliptic (K>0) geometry, which we attribute to curvature-dependent screening of tip branching.

  19. Aggregation behavior of illite using light scattering

    SciTech Connect

    Derrendinger, L.; Sposito, G.

    1995-12-01

    Stable environmental particles can be at the origin of facilitated transport of metals and organic compounds, especially contaminants. We investigated the destabilization (aggregation) kinetics of both a reference and a soil clay mineral: Imt-1 (Silver Hill) illite and Hanford soil illite, respectively. Dynamic and static light scattering was used to follow the aggregation kinetics and infer the structure of the resulting clusters. Kinetics curves showed exponential and power-law shapes, corresponding respectively to reaction-limited and diffusion-limited regimes. The fractal dimension of the clusters showed no observable change with the change of aggregation regime, its value always being between 2.10 and 2.25 ({plus_minus}0.12). The change in aggregation regime for Na-illite (or ccc) was measured to be 45 mol.m{sup -3}.

  20. SURVEY REPORT--NAVAJO COMMUNITY COLLEGE.

    ERIC Educational Resources Information Center

    ASHE, ROBERT W.

    THIS PLAN FOR THE ESTABLISHMENT OF A NAVAJO JUNIOR COLLEGE GOES INTO ALL ASPECTS OF ITS ORGANIZATION. IT DESCRIBES THE PRESENT NAVAJO SCHOOL SYSTEM, WHICH IS A COMBINATION OF MISSION, PUBLIC, AND BUREAU OF INDIAN AFFAIRS OPERATIONS. FINANCIAL HELP TO STUDENTS WANTING MORE THAN A HIGH SCHOOL EDUCATION IS PRESENTLY INADEQUATE, THROUGH INCREASING. IF…

  1. A demonstration of the virtual nursing college.

    PubMed

    Yensen, J A; Woolery, L K

    1995-01-01

    This demonstration will illustrate the operation of a virtual nursing college (VNC) through the Internet. The key concepts to be shown include: Distance and remote learning and teaching; Multi-site collaboration in teaching and clinical research using groupware; Multimedia courseware found in programmable virtual classrooms; Personal knowbots that manage information; Virtual clinics with virtual patients and simulated patients. PMID:8591569

  2. Restaurant Training Recipe At Triton College

    ERIC Educational Resources Information Center

    Quagliano, Joseph

    1974-01-01

    The successful restaurant training program at Triton College (Illinois) involves a broadly based, two-year curriculum offering practical training in nearly all the areas associated with a comprehensive food operation--management, food preparation, menu planning, nutrition, personnel vending, dining room service, and cost control. (Author/EA)

  3. The Responsive College Programme: A Progress Report.

    ERIC Educational Resources Information Center

    Holland, Geoffrey; And Others

    1986-01-01

    The Responsive College Programme is a centrally funded and organized activity encompassing a varied range of 10 local projects in England from whose experience it is hoped to obtain lessons for public sector education and training. The central/local nature of the enterprise imposes both the necessity of operating within broad, general constraints…

  4. Assessing Financial Health in Community Colleges

    ERIC Educational Resources Information Center

    Bers, Trudy H.; Head, Ronald B.

    2014-01-01

    In this age of educational accountability, there is an increasing emphasis on assessment and institutional effectiveness, not only in the academic arena but also in other aspects of community college operation, such as fiscal health and stability, revenue generation, resource allocation, facilities, workforce development, and community enrichment…

  5. Critical Intellectual Inquiry at Catholic Colleges

    ERIC Educational Resources Information Center

    Olszewski, Bernard

    2006-01-01

    In this article, the author, a professor and an academic administrator at a Catholic college, discusses the topics of academic freedom and intellectual debate within the context of Catholic schools operating under guidelines of the Vatican document "Ex Corde Ecclesiae." Under these guidelines, there are fundamental moral questions that are not…

  6. Job Hunting for the College Graduate.

    ERIC Educational Resources Information Center

    Erdlen, John D.; Sweet, Donald H.

    The new or soon-to-be college graduate is provided in this book with the basic facts of the employment process and the system within which this process operates. A master plan is presented for effective representation of self on paper, during the interview, when deciding upon a job offer, and on the job. Guidelines are established for…

  7. Library Automation in the Small College Environment.

    ERIC Educational Resources Information Center

    Worland, Peter B.; Nye, James H.

    The Folke Bernadotte Memorial Library contains 200,000 volumes and 900 serial subscriptions and operates with an annual budget as of 1974-75 of $235,000. It serves 2000 undergraduates in a 4 year liberal arts college. Library automation is used in the following areas: (1) bibliographic compilations; (2) cataloging of books, octavo choral…

  8. The National Maritime College of Ireland

    ERIC Educational Resources Information Center

    Greville, Eamonn

    2005-01-01

    The new National Maritime College of Ireland is regarded as the country's most exciting and innovative development in maritime training and education and is the first tertiary institution to be built and operated under the government's Public Private Partnership (PPP) model of procurement. The project is the outcome of a partnership between Cork…

  9. The Fundamentals of Community College Fund Raising.

    ERIC Educational Resources Information Center

    Brumbach, Mary A.; Bumphus, Walter G.

    1993-01-01

    Presents a guide for community college fund raising. Discusses organizational principles and structural models; operational concerns such as stewardship of funds, information dissemination, and donor research; and the importance of presidential support, institutional reputation and environment, and experienced grants managers. Includes practical…

  10. Glendale Community College Campus Profile '99.

    ERIC Educational Resources Information Center

    Spicer, Scot L.; Karpp, Edward R.; Amba, Conrad

    The Campus Profile is an annual publication designed to help faculty, staff, and students understand Glendale Community College's (California) diverse operations and make informed decisions. The publication is organized around the statewide accountability model. This year's Campus Profile includes more accountability performance measures than in…

  11. Aggregation of β-amyloid fragments

    NASA Astrophysics Data System (ADS)

    Meinke, Jan H.; Hansmann, Ulrich H. E.

    2007-01-01

    The authors study the folding and aggregation of six chains of the β-amyloid fragment 16-22 using Monte Carlo simulations. While the isolated fragment prefers a helical form at room temperature, in the system of six interacting fragments one observes both parallel and antiparallel β sheets below a crossover temperature Tx≈420K. The antiparallel sheets have lower energy and are therefore more stable. Above the nucleation temperature the aggregate quickly dissolves into widely separated, weakly interacting chains.

  12. Modeling Protein Aggregate Assembly and Structure

    NASA Astrophysics Data System (ADS)

    Guo, Jun-tao; Hall, Carol K.; Xu, Ying; Wetzel, Ronald

    One might say that "protein science" got its start in the domestic arts, built around the abilities of proteins to aggregate in response to environmental stresses such as heating (boiled eggs), heating and cooling (gelatin), and pH (cheese). Characterization of proteins in the late nineteenth century likewise focused on the ability of proteins to precipitate in response to certain salts and to aggregate in response to heating. Investigations by Chick and Martin (Chick and Martin, 1910) showed that the inactivating response of proteins to heat or solvent treatment is a two-step process involving separate denaturation and precipitation steps. Monitoring the coagulation and flocculation responses of proteins to heat and other stresses remained a major approach to understanding protein structure for decades, with solubility, or susceptibility to aggregation, serving as a kind of benchmark against which results of other methods, such as viscosity, chemical susceptibility, immune activity, crystallizability, and susceptibility to proteolysis, were compared (Mirsky and Pauling, 1936;Wu, 1931). Toward the middle of the last century, protein aggregation studies were largely left behind, as improved methods allowed elucidation of the primary sequence of proteins, reversible unfolding studies, and ultimately high-resolution structures. Curiously, the field of protein science, and in particular protein folding, is now gravitating back to a closer look at protein aggregation and protein aggregates. Unfortunately, the means developed during the second half of the twentieth century for studying native, globular proteins have not proved immediately amenable to the study of aggregate structures. Great progress is being made, however, to modify classical methods, including NMR and X-ray diffraction, as well as to develop newer techniques, that together should continue to expand our picture of aggregate structure (Kheterpal and Wetzel, 2006; Wetzel, 1999).

  13. Ion-specific aggregation of hydrophobic particles.

    PubMed

    López-León, Teresa; Ortega-Vinuesa, Juan Luis; Bastos-González, Delfina

    2012-06-18

    This work shows that colloidal stability and aggregation kinetics of hydrophobic polystyrene (PS) nanospheres are extremely sensitive to the nature of the salt used to coagulate them. Three PS latices and four aggregating electrolytes, which all share the same cation (Na(+)) but have various anions located at different positions in the classical Hofmeister series depending on their kosmotropic or chaotropic character, are used. The present study focuses on analyzing different aggregating parameters, such as critical coagulation concentrations (CCC), cluster size distributions (CSD), initial kinetic constants K(11), and fractal dimensions of the aggregates d(f). While aggregation induced by SO(4)(2-) and Cl(-) behaved according to the predictions of the classical Derjaguin-Landau-Verwey-Overbeek theory, important discrepancies are found with NO(3)(-), which become dramatic when using SCN(-). These discrepancies among the anions were far more significant when they acted as counterions rather than as co-ions. While SO(4)(2-) and Cl(-) trigger fast diffusion-limited aggregation, SCN(-) gives rise to a stationary cluster size distribution in a few aggregation times when working with cationic PS particles. Clear differences are found among all analyzed parameters (CCC, CSD, K(11), and d(f)), and the experimental findings show that particles aggregate in potential wells whose depth is controlled by the chaotropic character of the anion. This paper presents new experimental evidence that may help to understand the microscopic origin of Hofmeister effects, as the observations are consistent with appealing theoretical models developed in the last few years. PMID:22556130

  14. Identification of aggregates for Tennessee bituminous surface courses

    NASA Astrophysics Data System (ADS)

    Sauter, Heather Jean

    Tennessee road construction is a major venue for federal and state spending. Tax dollars each year go to the maintenance and construction of roads. One aspect of highway construction that affects the public is the safety of its state roads. There are many factors that affect the safety of a given road. One factor that was focused on in this research was the polish resistance capabilities of aggregates. Several pre-evaluation methods have been used in the laboratory to predict what will happen in a field situation. A new pre-evaluation method was invented that utilized AASHTO T 304 procedure upscaled to accommodate surface bituminous aggregates. This new method, called the Tennessee Terminal Textural Condition Method (T3CM), was approved by Tennessee Department of Transportation to be used as a pre-evaluation method on bituminous surface courses. It was proven to be operator insensitive, repeatable, and an accurate indication of particle shape and texture. Further research was needed to correlate pre-evaluation methods to the current field method, ASTM E 274-85 Locked Wheel Skid Trailer. In this research, twenty-five in-place bituminous projects and eight source evaluations were investigated. The information gathered would further validate the T3CM and find the pre-evaluation method that best predicted the field method. In addition, new sources of aggregates for bituminous surface courses were revealed. The results of this research have shown T3CM to be highly repeatable with an overall coefficient of variation of 0.26% for an eight sample repeatability test. It was the best correlated pre-evaluation method with the locked wheel skid trailer method giving an R2 value of 0.3946 and a Pearson coefficient of 0.710. Being able to predict field performance of aggregates prior to construction is a powerful tool capable of saving time, money, labor, and possibly lives.

  15. Growth hormone aggregates in the rat adenohypophysis

    NASA Technical Reports Server (NTRS)

    Farrington, M.; Hymer, W. C.

    1990-01-01

    Although it has been known for some time that GH aggregates are contained within the rat anterior pituitary gland, the role that they might play in pituitary function is unknown. The present study examines this issue using the technique of Western blotting, which permitted visualization of 11 GH variants with apparent mol wt ranging from 14-88K. Electroelution of the higher mol wt variants from gels followed by their chemical reduction with beta-mercaptoethanol increased GH immunoassayability by about 5-fold. With the blot procedure we found 1) that GH aggregates greater than 44K were associated with a 40,000 x g sedimentable fraction; 2) that GH aggregates were not present in glands from thyroidectomized rats, but were in glands from the thyroidectomized rats injected with T4; 3) that GH aggregates were uniquely associated with a heavily granulated somatotroph subpopulation isolated by density gradient centrifugation; and 4) that high mol wt GH forms were released from the dense somatotrophs in culture, since treatment of the culture medium with beta-mercaptoethanol increased GH immunoassayability by about 5-fold. Taken together, the results show that high mol wt GH aggregates are contained in secretory granules of certain somatotrophs and are also released in aggregate form from these cells in vitro.

  16. An energy landscape approach to protein aggregation

    NASA Astrophysics Data System (ADS)

    Buell, Alexander; Knowles, Tuomas

    2012-02-01

    Protein aggregation into ordered fibrillar structures is the hallmark of a class of diseases, the most prominent examples of which are Alzheimer's and Parkinson's disease. Recent results (e.g. Baldwin et al. J. Am. Chem. Soc. 2011) suggest that the aggregated state of a protein is in many cases thermodynamically more stable than the soluble state. Therefore the solubility of proteins in a cellular context appears to be to a large extent under kinetic control. Here, we first present a conceptual framework for the description of protein aggregation ( see AK Buell et al., Phys. Rev. Lett. 2010) that is an extension to the generally accepted energy landscape model for protein folding. Then we apply this model to analyse and interpret a large set of experimental data on the kinetics of protein aggregation, acquired mainly with a novel biosensing approach (see TPJK Knowles et al, Proc. Nat. Acad. Sc. 2007). We show how for example the effect of sequence modifications on the kinetics and thermodynamics of human lysozyme aggregation can be understood and quantified (see AK Buell et al., J. Am. Chem. Soc. 2011). These results have important implications for therapeutic strategies against protein aggregation disorders, in this case lysozyme systemic amyloidosis.

  17. Influence of Phenylalanine on Carotenoid Aggregation

    NASA Astrophysics Data System (ADS)

    Lu, L.; Ni, X.; Luo, X.

    2015-01-01

    The carotenoids lutein and β-carotene form, in 1:1 ethanol-water mixtures H-aggregates, of different strengths. The effects of phenylalanine on these aggregates were recorded by UV-Vis absorption, steady-state fluorescence, and Raman spectra. The H-aggregate of lutein was characterized by a large 78 nm blue shift in the absorption spectra, confirming the strong coupling between hydroxyl groups of adjacent molecules. The 15 nm blue shift in the β-carotene mixture also indicates that it was assembled by weak coupling between polyenes. After adding phenylalanine, the reducing absorption strength of the aggregates of lutein and reappearance of vibrational substructure indicate that the hydroxyl and amino groups of phenylalanine may coordinate to lutein and disaggregate the H-aggregates. However, phenylalanine had no effect on aggregates of β-carotene. The Raman spectra show three bands of carotenoids whose intensities decreased with increasing phenylalanine concentration. The frequency of ν1 corresponding to the length of the conjugated region was more sensitive to the solution of lutein. This coordination of phenylalanine to lutein could increase the length of the conjugated region. In addition, phenylalanine significantly affected the excited electronic states of carotenoids, which were crucial in the energy transfer from carotenoids to chlorophyll a in vivo.

  18. Aggregation of commercial heparin samples in storage.

    PubMed

    Racey, T J; Rochon, P; Awang, D V; Neville, G A

    1987-04-01

    The size distribution of heparin aggregates in commercial heparin preparations was examined with the technique of quasi-elastic light scattering. The size distributions were initially examined to determine if any relationship existed between the physical state of the heparin preparation, its age, and its biological activity. It was found that commercial heparin samples change their aggregation state in storage. The amount of aggregation appears to be related to the amount of time in storage and to the storage history. Storage of the samples under conditions of refrigeration and handling represents the storage history that most noticeably increases the aggregation state of the heparin preparations. These aggregates, once formed, appear to be stable. The biological activity of the heparin samples (as measured by the official test) was found to still fall within the accepted limits, independent of the aggregation state of the samples. It is not known what effect, if any, a change in the physical state of the commercial preparation should have on its biological activity. PMID:3598891

  19. Simulations of kinetically irreversible protein aggregate structure.

    PubMed Central

    Patro, S Y; Przybycien, T M

    1994-01-01

    We have simulated the structure of kinetically irreversible protein aggregates in two-dimensional space using a lattice-based Monte-Carlo routine. Our model specifically accounts for the intermolecular interactions between hydrophobic and hydrophilic protein surfaces and a polar solvent. The simulations provide information about the aggregate density, the types of inter-monomer contacts and solvent content within the aggregates, the type and extent of solvent exposed perimeter, and the short- and long-range order all as a function of (i) the extent of monomer hydrophobic surface area and its distribution on the model protein surface and (ii) the magnitude of the hydrophobic-hydrophobic contact energy. An increase in the extent of monomer hydrophobic surface area resulted in increased aggregate densities with concomitant decreased system free energies. These effects are accompanied by increases in the number of hydrophobic-hydrophobic contacts and decreases in the solvent-exposed hydrophobic surface area of the aggregates. Grouping monomer hydrophobic surfaces in a single contiguous stretch resulted in lower aggregate densities and lower short range order. More favorable hydrophobic-hydrophobic contact energies produced structures with higher densities but the number of unfavorable protein-protein contacts was also observed to increase; greater configurational entropy produced the opposite effect. Properties predicted by our model are in good qualitative agreement with available experimental observations. Images FIGURE 6 FIGURE 13 PMID:8061184

  20. Center for Consumer Home Economics Education. Project Number 91-0095 and 91-0095, A-1 and A-2, January 31, 1992-June 30, 1993. A Report on Center Operation and Activities Conducted for California Community College Home Economics and Related Professionals.

    ERIC Educational Resources Information Center

    Mount San Antonio Coll., Walnut, CA.

    In an effort to improve community college home economics programs, the Chancellor's Office of the California Community Colleges established the Center for Consumer Home Economics Education (CCHEE) to provide support services for colleges receiving home economics MiniGrants, to establish linkages between colleges and the Chancellor's Office, and to…

  1. Effects of tau domain-specific antibodies and intravenous immunoglobulin on tau aggregation and aggregate degradation.

    PubMed

    Esteves-Villanueva, Jose O; Trzeciakiewicz, Hanna; Loeffler, David A; Martić, Sanela

    2015-01-20

    Tau pathology, including neurofibrillary tangles, develops in Alzheimer's disease (AD). The aggregation and hyperphosphorylation of tau are potential therapeutic targets for AD. Administration of anti-tau antibodies reduces tau pathology in transgenic "tauopathy" mice; however, the optimal tau epitopes and conformations to target are unclear. Also unknown is whether intravenous immunoglobulin (IVIG) products, currently being evaluated in AD trials, exert effects on pathological tau. This study examined the effects of anti-tau antibodies targeting different tau epitopes and the IVIG Gammagard on tau aggregation and preformed tau aggregates. Tau aggregation was assessed by transmission electron microscopy and fluorescence spectroscopy, and the binding affinity of the anti-tau antibodies for tau was evaluated by enzyme-linked immunosorbent assays. Antibodies used were anti-tau 1-150 ("D-8"), anti-tau 259-266 ("Paired-262"), anti-tau 341-360 ("A-10"), and anti-tau 404-441 ("Tau-46"), which bind to tau's N-terminus, microtubule binding domain (MBD) repeat sequences R1 and R4, and the C-terminus, respectively. The antibodies Paired-262 and A-10, but not D-8 and Tau-46, reduced tau fibrillization and degraded preformed tau aggregates, whereas the IVIG reduced tau aggregation but did not alter preformed aggregates. The binding affinities of the antibodies for the epitope for which they were specific did not appear to be related to their effects on tau aggregation. These results confirm that antibody binding to tau's MBD repeat sequences may inhibit tau aggregation and indicate that such antibodies may also degrade preformed tau aggregates. In the presence of anti-tau antibodies, the resulting tau morphologies were antigen-dependent. The results also suggested the possibility of different pathways regulating antibody-mediated inhibition of tau aggregation and antibody-mediated degradation of preformed tau aggregates. PMID:25545358

  2. A Prediction Model for Community Colleges Using Graduation Rate as the Performance Indicator

    ERIC Educational Resources Information Center

    Moosai, Susan

    2010-01-01

    In this thesis a prediction model using graduation rate as the performance indicator is obtained for community colleges for three cohort years, 2003, 2004, and 2005 in the states of California, Florida, and Michigan. Multiple Regression analysis, using an aggregate of seven predictor variables, was employed in determining this prediction model.…

  3. Institutional Characteristics and Student Retention in Public 4-Year Colleges and Universities

    ERIC Educational Resources Information Center

    Marsh, Gregory

    2014-01-01

    The purpose of this study was to determine the relative importance of specific student and institutional factors and characteristics on the retention of students at public, 4-year colleges and universities in the United States based on aggregate student cohort and institutional data. The overriding goal of this research was to identify any…

  4. Average College Endowment Grows by 7.2 Percent: Results of the 1991 NACUBO Endowment Study.

    ERIC Educational Resources Information Center

    Jenkins, Robin

    1992-01-01

    This report details results of a 1991 survey of 396 colleges and universities concerning aggregate investment base ($64.5 billion), spending rates, purchasing power, asset allocation, and performance measures. A table lists the institutions, their endowment assets, and their life income fund assets. (DB)

  5. College Applicants Who Took the COMPASS Test in 2006 (Part 1): Applicant Data

    ERIC Educational Resources Information Center

    Preuss, Michael

    2008-01-01

    The purpose of this ex post facto investigation was to determine the characteristics of and need for developmental education in the college applicant pool in 2006. Demographic data and COMPASS placement test results were gathered for the 1,079 applicants in 2006 who had complete records. These data were considered in the aggregate and in subsets…

  6. Innovative Ideas in College Physical Education

    ERIC Educational Resources Information Center

    Cogan, Max

    1973-01-01

    Seven examples of adaptation and new developments are described: Graceland College, Manchester College, Plymouth State College, U.S. Coast Guard Academy, Colorado State College, North Carolina State University, and Brookdale Community College. (Editors/JA)

  7. Thermal Aggregation of Recombinant Protective Antigen: Aggregate Morphology and Growth Rate

    PubMed Central

    Belton, Daniel J.; Miller, Aline F.

    2013-01-01

    The thermal aggregation of the biopharmaceutical protein recombinant protective antigen (rPA) has been explored, and the associated kinetics and thermodynamic parameters have been extracted using optical and environmental scanning electron microscopies (ESEMs) and ultraviolet light scattering spectroscopy (UV-LSS). Visual observations and turbidity measurements provided an overall picture of the aggregation process, suggesting a two-step mechanism. Microscopy was used to examine the structure of aggregates, revealing an open morphology formed by the clustering of the microscopic aggregate particles. UV-LSS was used and developed to elucidate the growth rate of these particles, which formed in the first stage of the aggregation process. Their growth rate is observed to be high initially, before falling to converge on a final size that correlates with the ESEM data. The results suggest that the particle growth rate is limited by rPA monomer concentration, and by obtaining data over a range of incubation temperatures, an approach was developed to model the aggregation kinetics and extract the rate constants and the temperature dependence of aggregation. In doing so, we quantified the susceptibility of rPA aggregation under different temperature and environmental conditions and moreover demonstrated a novel use of UV spectrometry to monitor the particle aggregation quantitatively, in situ, in a nondestructive and time-resolved manner. PMID:23476645

  8. In-House vs. Franchise College Food Services and Bookstores.

    ERIC Educational Resources Information Center

    Stumph, W. J.

    In determining whether colleges or universities should operate their own food services or bookstores or lease them to contract operators, school business officers should consider a number of factors. These include whether sales volume is sufficiently large to cover direct operating costs and overhead; inventory investment; appearance, service, and…

  9. Norway's Regional College System.

    ERIC Educational Resources Information Center

    Hanisch, Thor Einar

    1981-01-01

    Examines the structure of Norway's short-cycle educational system. Describes how the district colleges function individually as units and collectively within a regional system to provide comprehensive, community-based educational opportunities. Discusses the incorporation of a variety of colleges into the regional system and encourages increased…

  10. COLLEGE-COMMUNITY CONSULTATION.

    ERIC Educational Resources Information Center

    AXFORD, ROGER W.

    THE MODERN UNIVERSITY RECOGNIZES THREE MAJOR RESPONSIBILITIES--TEACHING, RESEARCH, AND PUBLIC SERVICE. REPRESENTATIVES OF 14 COLLEGES AND UNIVERSITIES MET AT NORTHERN ILLINOIS UNIVERSITY TO DISCUSS THE ROLE THE COLLEGE CAN PLAY IN WORKING WITH THE COMMUNITY OF WHICH IT IS A PART. THIS PUBLICATION IS AN OUTGROWTH OF THAT CONFERENCE, ONE OF SEVEN…

  11. Avant Garde Community Colleges

    ERIC Educational Resources Information Center

    Rosenfeld, Stuart A.

    2005-01-01

    Community colleges have become many things to many people over their century-long transformation from junior colleges into comprehensive learning environments. They have been able and willing to take on missions and serve people that other sectors of education could not or would not. Today they have become well known for their efforts in…

  12. What Is College for?

    ERIC Educational Resources Information Center

    Wise, Phyllis M.; Martin, Carolyn A.; Kinbrough, Walter M.; Hitt, John C.; Urgo, Joseph R.; Lief, Charles G.; Drake, Michael V.; Hellyer, Brenda; Pepicello, William

    2013-01-01

    Lately there has been a great deal of discussion about the importance of measuring a college's "return on investment." Is the point of a college education quantifiable results or personal and intellectual growth? In pursuit of answers, "The Chronicle" asked a selection of higher-education leaders. Phyllis M. Wise, Chancellor of the University of…

  13. Predictors of College Success.

    ERIC Educational Resources Information Center

    Hopper, Harold H.

    This study of prediction of college success was designed to use the high school GPA and other variables, both cognitive and non-cognitive. It attempted to locate factors that would predict grades in English, mathematics, and biology, as well as predict the over-all GPA. Seven hundred students were examined. In college English, 49% of the variance…

  14. Washington Community Colleges Factbook.

    ERIC Educational Resources Information Center

    Meier, Terre; Story, Sherie

    Detailed information on the 27 state-supported community colleges in Washington is presented in six sections. The first section, containing general information, describes the state system organization, lists the individual colleges, and reviews the roles of state agencies and presents a history of the system. A section on student information…

  15. Washington Community Colleges Factbook.

    ERIC Educational Resources Information Center

    Meier, Terre

    The 109 tables and graphs in this six-chapter factbook present a statistical profile of the Washington Community College System for Fall 1979. Chapter I presents background information on the history and organization of the 27 state-supported colleges. Chapter II outlines data on annual and quarterly enrollments from 1969 through 1979; student…

  16. Drinking among College Students.

    ERIC Educational Resources Information Center

    Rabow, Jerome; Duncan-Schill, Marilyn

    1995-01-01

    Reports the results of a study on the ways in which alcohol is built into the social role and social life of college students. Provides direct support for the idea that the patterns of drinking alcoholic beverages are integral to social and structural aspects of college. (LKS)

  17. Latino College Completion: Oklahoma

    ERIC Educational Resources Information Center

    Excelencia in Education (NJ1), 2012

    2012-01-01

    In 2009, Excelencia in Education launched the Ensuring America's Future initiative to inform, organize, and engage leaders in a tactical plan to increase Latino college completion. An executive summary of Latino College Completion in 50 states synthesizes information on 50 state factsheets and builds on the national benchmarking guide. Each…

  18. Coaching and College Success

    ERIC Educational Resources Information Center

    Richman, Erica Lynn; Rademacher, Kristen N.; Maitland, Theresa Laurie

    2014-01-01

    Students with learning disabilities (LD) and Attention Deficit/Hyperactivity Disorder (ADHD) represent the largest segment of college students with documented disabilities. Despite enhanced access to accommodations under the Americans with Disabilities Amendments Act, this growing population continues to take longer to complete a college education…

  19. College Board Crash Courses

    ERIC Educational Resources Information Center

    White, Jack; Yanker, Gary

    1972-01-01

    Increasing pressures on students to gain admission to highly competitive colleges has brought about an upsurge in tutorial services and the use of sample test questions, which are supposed to guarantee success on college admissions tests. Their effect, at best seems scant. (Author/RK)

  20. Employment of College Students.

    ERIC Educational Resources Information Center

    High, Robert V.

    A survey was conducted to determine the effect on academic performance, if any, of employment on undergraduate college students. A questionnaire was sent to professors at 3 four-year colleges on Long Island (New York); various day classes were randomly selected. The final sample of n=257 represented approximately a 30 percent response. The…

  1. Applying to College

    ERIC Educational Resources Information Center

    Tierney, William G.

    2009-01-01

    This article suggests that unlike their well-off counterparts who apply to college in the fall and know they will go somewhere when the applications have been sent, low-income students face unique challenges that extend the process in a manner entirely different from the wealthy. The notion that college-going is a cultural interpretation is…

  2. Latino College Completion: Washington

    ERIC Educational Resources Information Center

    Excelencia in Education (NJ1), 2012

    2012-01-01

    In 2009, Excelencia in Education launched the Ensuring America's Future initiative to inform, organize, and engage leaders in a tactical plan to increase Latino college completion. An executive summary of Latino College Completion in 50 states synthesizes information on 50 state factsheets and builds on the national benchmarking guide. Each…

  3. Latino College Completion: Wisconsin

    ERIC Educational Resources Information Center

    Excelencia in Education (NJ1), 2012

    2012-01-01

    In 2009, Excelencia in Education launched the Ensuring America's Future initiative to inform, organize, and engage leaders in a tactical plan to increase Latino college completion. An executive summary of Latino College Completion in 50 states synthesizes information on 50 state factsheets and builds on the national benchmarking guide. Each…

  4. Latino College Completion: Wyoming

    ERIC Educational Resources Information Center

    Excelencia in Education (NJ1), 2012

    2012-01-01

    In 2009, Excelencia in Education launched the Ensuring America's Future initiative to inform, organize, and engage leaders in a tactical plan to increase Latino college completion. An executive summary of Latino College Completion in 50 states synthesizes information on 50 state factsheets and builds on the national benchmarking guide. Each…

  5. Latino College Completion: Utah

    ERIC Educational Resources Information Center

    Excelencia in Education (NJ1), 2012

    2012-01-01

    In 2009, Excelencia in Education launched the Ensuring America's Future initiative to inform, organize, and engage leaders in a tactical plan to increase Latino college completion. An executive summary of Latino College Completion in 50 states synthesizes information on 50 state factsheets and builds on the national benchmarking guide. Each…

  6. Latino College Completion: Massachusetts

    ERIC Educational Resources Information Center

    Excelencia in Education (NJ1), 2012

    2012-01-01

    In 2009, Excelencia in Education launched the Ensuring America's Future initiative to inform, organize, and engage leaders in a tactical plan to increase Latino college completion. An executive summary of Latino College Completion in 50 states synthesizes information on 50 state factsheets and builds on the national benchmarking guide. Each…

  7. Latino College Completion: Kansas

    ERIC Educational Resources Information Center

    Excelencia in Education (NJ1), 2012

    2012-01-01

    In 2009, Excelencia in Education launched the Ensuring America's Future initiative to inform, organize, and engage leaders in a tactical plan to increase Latino college completion. An executive summary of Latino College Completion in 50 states synthesizes information on 50 state factsheets and builds on the national benchmarking guide. Each…

  8. Latino College Completion: Colorado

    ERIC Educational Resources Information Center

    Excelencia in Education (NJ1), 2012

    2012-01-01

    In 2009, Excelencia in Education launched the Ensuring America's Future initiative to inform, organize, and engage leaders in a tactical plan to increase Latino college completion. An executive summary of Latino College Completion in 50 states synthesizes information on 50 state factsheets and builds on the national benchmarking guide. Each…

  9. Latino College Completion: Alabama

    ERIC Educational Resources Information Center

    Excelencia in Education (NJ1), 2012

    2012-01-01

    In 2009, Excelencia in Education launched the Ensuring America's Future initiative to inform, organize, and engage leaders in a tactical plan to increase Latino college completion. An executive summary of Latino College Completion in 50 states synthesizes information on 50 state factsheets and builds on the national benchmarking guide. Each…

  10. Latino College Completion: Arizona

    ERIC Educational Resources Information Center

    Excelencia in Education (NJ1), 2012

    2012-01-01

    In 2009, Excelencia in Education launched the Ensuring America's Future initiative to inform, organize, and engage leaders in a tactical plan to increase Latino college completion. An executive summary of Latino College Completion in 50 states synthesizes information on 50 state factsheets and builds on the national benchmarking guide. Each…

  11. Latino College Completion: Michigan

    ERIC Educational Resources Information Center

    Excelencia in Education (NJ1), 2012

    2012-01-01

    In 2009, Excelencia in Education launched the Ensuring America's Future initiative to inform, organize, and engage leaders in a tactical plan to increase Latino college completion. An executive summary of Latino College Completion in 50 states synthesizes information on 50 state factsheets and builds on the national benchmarking guide. Each…

  12. Latino College Completion: Illinois

    ERIC Educational Resources Information Center

    Excelencia in Education (NJ1), 2012

    2012-01-01

    In 2009, Excelencia in Education launched the Ensuring America's Future initiative to inform, organize, and engage leaders in a tactical plan to increase Latino college completion. An executive summary of Latino College Completion in 50 states synthesizes information on 50 state factsheets and builds on the national benchmarking guide. Each…

  13. Latino College Completion: Minnesota

    ERIC Educational Resources Information Center

    Excelencia in Education (NJ1), 2012

    2012-01-01

    In 2009, Excelencia in Education launched the Ensuring America's Future initiative to inform, organize, and engage leaders in a tactical plan to increase Latino college completion. An executive summary of Latino College Completion in 50 states synthesizes information on 50 state factsheets and builds on the national benchmarking guide. Each…

  14. Latino College Completion: Maine

    ERIC Educational Resources Information Center

    Excelencia in Education (NJ1), 2012

    2012-01-01

    In 2009, Excelencia in Education launched the Ensuring America's Future initiative to inform, organize, and engage leaders in a tactical plan to increase Latino college completion. An executive summary of Latino College Completion in 50 states synthesizes information on 50 state factsheets and builds on the national benchmarking guide. Each…

  15. Latino College Completion: Connecticut

    ERIC Educational Resources Information Center

    Excelencia in Education (NJ1), 2012

    2012-01-01

    In 2009, Excelencia in Education launched the Ensuring America's Future initiative to inform, organize, and engage leaders in a tactical plan to increase Latino college completion. An executive summary of Latino College Completion in 50 states synthesizes information on 50 state factsheets and builds on the national benchmarking guide. Each…

  16. Latino College Completion: Indiana

    ERIC Educational Resources Information Center

    Excelencia in Education (NJ1), 2012

    2012-01-01

    In 2009, Excelencia in Education launched the Ensuring America's Future initiative to inform, organize, and engage leaders in a tactical plan to increase Latino college completion. An executive summary of Latino College Completion in 50 states synthesizes information on 50 state factsheets and builds on the national benchmarking guide. Each…

  17. Latino College Completion: Maryland

    ERIC Educational Resources Information Center

    Excelencia in Education (NJ1), 2012

    2012-01-01

    In 2009, Excelencia in Education launched the Ensuring America's Future initiative to inform, organize, and engage leaders in a tactical plan to increase Latino college completion. An executive summary of Latino College Completion in 50 states synthesizes information on 50 state factsheets and builds on the national benchmarking guide. Each…

  18. Latino College Completion: Arkansas

    ERIC Educational Resources Information Center

    Excelencia in Education (NJ1), 2012

    2012-01-01

    In 2009, Excelencia in Education launched the Ensuring America's Future initiative to inform, organize, and engage leaders in a tactical plan to increase Latino college completion. An executive summary of Latino College Completion in 50 states synthesizes information on 50 state factsheets and builds on the national benchmarking guide. Each…

  19. Latino College Completion: Delaware

    ERIC Educational Resources Information Center

    Excelencia in Education (NJ1), 2012

    2012-01-01

    In 2009, Excelencia in Education launched the Ensuring America's Future initiative to inform, organize, and engage leaders in a tactical plan to increase Latino college completion. An executive summary of Latino College Completion in 50 states synthesizes information on 50 state factsheets and builds on the national benchmarking guide. Each…

  20. Latino College Completion: Alaska

    ERIC Educational Resources Information Center

    Excelencia in Education (NJ1), 2012

    2012-01-01

    In 2009, Excelencia in Education launched the Ensuring America's Future initiative to inform, organize, and engage leaders in a tactical plan to increase Latino college completion. An executive summary of Latino College Completion in 50 states synthesizes information on 50 state factsheets and builds on the national benchmarking guide. Each…

  1. Latino College Completion: Kentucky

    ERIC Educational Resources Information Center

    Excelencia in Education (NJ1), 2012

    2012-01-01

    In 2009, Excelencia in Education launched the Ensuring America's Future initiative to inform, organize, and engage leaders in a tactical plan to increase Latino college completion. An executive summary of Latino College Completion in 50 states synthesizes information on 50 state factsheets and builds on the national benchmarking guide. Each…

  2. Latino College Completion: Mississippi

    ERIC Educational Resources Information Center

    Excelencia in Education (NJ1), 2012

    2012-01-01

    In 2009, Excelencia in Education launched the Ensuring America's Future initiative to inform, organize, and engage leaders in a tactical plan to increase Latino college completion. An executive summary of Latino College Completion in 50 states synthesizes information on 50 state factsheets and builds on the national benchmarking guide. Each…

  3. Latino College Completion: Nevada

    ERIC Educational Resources Information Center

    Excelencia in Education (NJ1), 2012

    2012-01-01

    In 2009, Excelencia in Education launched the Ensuring America's Future initiative to inform, organize, and engage leaders in a tactical plan to increase Latino college completion. An executive summary of Latino College Completion in 50 states synthesizes information on 50 state factsheets and builds on the national benchmarking guide. Each…

  4. Latino College Completion: California

    ERIC Educational Resources Information Center

    Excelencia in Education (NJ1), 2012

    2012-01-01

    In 2009, Excelencia in Education launched the Ensuring America's Future initiative to inform, organize, and engage leaders in a tactical plan to increase Latino college completion. An executive summary of Latino College Completion in 50 states synthesizes information on 50 state factsheets and builds on the national benchmarking guide. Each…

  5. Latino College Completion: Missouri

    ERIC Educational Resources Information Center

    Excelencia in Education (NJ1), 2012

    2012-01-01

    In 2009, Excelencia in Education launched the Ensuring America's Future initiative to inform, organize, and engage leaders in a tactical plan to increase Latino college completion. An executive summary of Latino College Completion in 50 states synthesizes information on 50 state factsheets and builds on the national benchmarking guide. Each…

  6. Latino College Completion: Nebraska

    ERIC Educational Resources Information Center

    Excelencia in Education (NJ1), 2012

    2012-01-01

    In 2009, Excelencia in Education launched the Ensuring America's Future initiative to inform, organize, and engage leaders in a tactical plan to increase Latino college completion. An executive summary of Latino College Completion in 50 states synthesizes information on 50 state factsheets and builds on the national benchmarking guide. Each…

  7. Latino College Completion: Vermont

    ERIC Educational Resources Information Center

    Excelencia in Education (NJ1), 2012

    2012-01-01

    In 2009, Excelencia in Education launched the Ensuring America's Future initiative to inform, organize, and engage leaders in a tactical plan to increase Latino college completion. An executive summary of Latino College Completion in 50 states synthesizes information on 50 state factsheets and builds on the national benchmarking guide. Each…

  8. Latino College Completion: Montana

    ERIC Educational Resources Information Center

    Excelencia in Education (NJ1), 2012

    2012-01-01

    In 2009, Excelencia in Education launched the Ensuring America's Future initiative to inform, organize, and engage leaders in a tactical plan to increase Latino college completion. An executive summary of Latino College Completion in 50 states synthesizes information on 50 state factsheets and builds on the national benchmarking guide. Each…

  9. Latino College Completion: Florida

    ERIC Educational Resources Information Center

    Excelencia in Education (NJ1), 2012

    2012-01-01

    In 2009, Excelencia in Education launched the Ensuring America's Future initiative to inform, organize, and engage leaders in a tactical plan to increase Latino college completion. An executive summary of Latino College Completion in 50 states synthesizes information on 50 state factsheets and builds on the national benchmarking guide. Each…

  10. Latino College Completion: Oregon

    ERIC Educational Resources Information Center

    Excelencia in Education (NJ1), 2012

    2012-01-01

    In 2009, Excelencia in Education launched the Ensuring America's Future initiative to inform, organize, and engage leaders in a tactical plan to increase Latino college completion. An executive summary of Latino College Completion in 50 states synthesizes information on 50 state factsheets and builds on the national benchmarking guide. Each…

  11. Latino College Completion: Louisiana

    ERIC Educational Resources Information Center

    Excelencia in Education (NJ1), 2012

    2012-01-01

    In 2009, Excelencia in Education launched the Ensuring America's Future initiative to inform, organize, and engage leaders in a tactical plan to increase Latino college completion. An executive summary of Latino College Completion in 50 states synthesizes information on 50 state factsheets and builds on the national benchmarking guide. Each…

  12. Latino College Completion: Ohio

    ERIC Educational Resources Information Center

    Excelencia in Education (NJ1), 2012

    2012-01-01

    In 2009, Excelencia in Education launched the Ensuring America's Future initiative to inform, organize, and engage leaders in a tactical plan to increase Latino college completion. An executive summary of Latino College Completion in 50 states synthesizes information on 50 state factsheets and builds on the national benchmarking guide. Each…

  13. Latino College Completion: Hawaii

    ERIC Educational Resources Information Center

    Excelencia in Education (NJ1), 2012

    2012-01-01

    In 2009, Excelencia in Education launched the Ensuring America's Future initiative to inform, organize, and engage leaders in a tactical plan to increase Latino college completion. An executive summary of Latino College Completion in 50 states synthesizes information on 50 state factsheets and builds on the national benchmarking guide. Each…

  14. Latino College Completion: Idaho

    ERIC Educational Resources Information Center

    Excelencia in Education (NJ1), 2012

    2012-01-01

    In 2009, Excelencia in Education launched the Ensuring America's Future initiative to inform, organize, and engage leaders in a tactical plan to increase Latino college completion. An executive summary of Latino College Completion in 50 states synthesizes information on 50 state factsheets and builds on the national benchmarking guide. Each…

  15. Latino College Completion: Iowa

    ERIC Educational Resources Information Center

    Excelencia in Education (NJ1), 2012

    2012-01-01

    In 2009, Excelencia in Education launched the Ensuring America's Future initiative to inform, organize, and engage leaders in a tactical plan to increase Latino college completion. An executive summary of Latino College Completion in 50 states synthesizes information on 50 state factsheets and builds on the national benchmarking guide. Each…

  16. Latino College Completion: Tennessee

    ERIC Educational Resources Information Center

    Excelencia in Education (NJ1), 2012

    2012-01-01

    In 2009, Excelencia in Education launched the Ensuring America's Future initiative to inform, organize, and engage leaders in a tactical plan to increase Latino college completion. An executive summary of Latino College Completion in 50 states synthesizes information on 50 state factsheets and builds on the national benchmarking guide. Each…

  17. Latino College Completion: Pennsylvania

    ERIC Educational Resources Information Center

    Excelencia in Education (NJ1), 2012

    2012-01-01

    In 2009, Excelencia in Education launched the Ensuring America's Future initiative to inform, organize, and engage leaders in a tactical plan to increase Latino college completion. An executive summary of Latino College Completion in 50 states synthesizes information on 50 state factsheets and builds on the national benchmarking guide. Each…

  18. Community College Governance.

    ERIC Educational Resources Information Center

    Wyoming Community Coll. Commission, Cheyenne.

    This report presents the findings of the state legislature's Management Audit Committee's review of the structure and governance of community colleges in Wyoming, as requested by the Legislature's Management Council in September 1998. In trying to answer questions about the structure of community college governance, the tensions present in the…

  19. The Future Community College

    ERIC Educational Resources Information Center

    Elsner, Paul A.

    2003-01-01

    Community colleges have encountered many factors that may reshape their future. Environmental imperatives weigh heavily on community colleges, as does the new integration of the sciences, such as breakthroughs in the biochemical sciences, such as the human genome project. It is also important to pay attention to the forms in which knowledge is…

  20. Cabrillo College Transportation Study.

    ERIC Educational Resources Information Center

    Willett, Terrence

    This report provides results of the survey and other sources of information which have been used to develop a transportation management plan at Cabrillo College (California). In 2000, Cabrillo College organized a Transportation Management Committee to review the existing transportation situation and develop and implement a plan with the goal of…

  1. Community College Partnership.

    ERIC Educational Resources Information Center

    Black, Marjorie

    Community colleges must assume a proactive leadership role to develop strategies that establish and maintain partnerships with business and other community organizations. San Juan College (SJC) has forged partnerships with a variety of local organizations, including governmental, civic, business, educational, medical, and cultural groups.…

  2. IT Assessment: Floyd College.

    ERIC Educational Resources Information Center

    Lord, Joan; Bishop, Jack

    2001-01-01

    Discusses Floyd College's (Georgia) Information Technology Project (ITP), which began in 1997. Reports that every student and faculty member at the college is given a laptop, network connections have been implemented all over campus, and a help desk service provides technical support. The project has been successful, but student headcount fell…

  3. College for All?

    ERIC Educational Resources Information Center

    Carnevale, Anthony P.

    2008-01-01

    "College for all" arises from deep in our individualistic cultural bias, and the motto works as a public narrative because high school vocational alternatives are widely regarded as second best by the general public, if not by the elites. However, there is more to "college for all" than cultural bias, political positioning, and middle-class angst.…

  4. Cabrillo College Mentor Handbook.

    ERIC Educational Resources Information Center

    Cabrillo Coll., Aptos, CA.

    This document details the goals and characteristics of the faculty Mentor Program at Cabrillo Community College (California). The program is designed to facilitate the orientation and adaptation of new faculty members to the role of community college instructor. Experienced faculty members act as mentors to new tenure-track faculty. Mentors are…

  5. Reinventing the Community College.

    ERIC Educational Resources Information Center

    Johnson, Dennis L.

    1990-01-01

    In the 1990s, community colleges will be faced with a real challenge and an opportunity: to become marketing-oriented institutions. Marketing is crucial to reinventing the colleges as institutions that are capable of contributing to the education of an underskilled workforce and a significant underclass--an endeavor vital to the nation's…

  6. Latino College Completion: Georgia

    ERIC Educational Resources Information Center

    Excelencia in Education (NJ1), 2012

    2012-01-01

    In 2009, Excelencia in Education launched the Ensuring America's Future initiative to inform, organize, and engage leaders in a tactical plan to increase Latino college completion. An executive summary of Latino College Completion in 50 states synthesizes information on 50 state factsheets and builds on the national benchmarking guide. Each…

  7. Latino College Completion: Virginia

    ERIC Educational Resources Information Center

    Excelencia in Education (NJ1), 2012

    2012-01-01

    In 2009, Excelencia in Education launched the Ensuring America's Future initiative to inform, organize, and engage leaders in a tactical plan to increase Latino college completion. An executive summary of Latino College Completion in 50 states synthesizes information on 50 state factsheets and builds on the national benchmarking guide. Each…

  8. Community College Online

    ERIC Educational Resources Information Center

    Fishman, Rachel

    2015-01-01

    This report explores the demographics of community college students and how they compare to those in other sectors of higher education. Next, it reviews the common reasons undergraduate students stop their studies or drop out. The report then examines technology-enhanced education in community colleges and presents several case studies showing how…

  9. Corporate Boss, College President

    ERIC Educational Resources Information Center

    Alden, Vernon R.

    1978-01-01

    Differences between the roles of a corporate administrator and a college president are reviewed and related to the role of an effective trustee. It is noted that accountability demands affect institutional autonomy and that trustees must become more involved in policy-making to protect the academic freedom of colleges and universities in the…

  10. For-Profit Colleges

    ERIC Educational Resources Information Center

    Deming, David; Goldin, Claudia; Katz, Lawrence

    2013-01-01

    For-profit, or proprietary, colleges are the fastest-growing postsecondary schools in the nation, enrolling a disproportionately high share of disadvantaged and minority students and those ill-prepared for college. Because these schools, many of them big national chains, derive most of their revenue from taxpayer-funded student financial aid, they…

  11. The Pregnant College Girl

    ERIC Educational Resources Information Center

    Siddall, Lawrence B.

    1971-01-01

    Pregnancy among single college women is cause for much concern. This article suggests that the college should take the initiative in offering help and in seeking new ways of prevention. Institutions should provide medical care, counseling, and educational programs in an atmosphere of understanding, compassion, and trust. (Author/BY)

  12. Black College Enterprise.

    ERIC Educational Resources Information Center

    Roach, Ronald

    1999-01-01

    Under the leadership of President David H. Swinton, Benedict College (North Carolina) has provided leadership and support for local economic development, benefitting both the community and the school. Trustees invested college endowment funds to help save the sole black-owned banking institution in the state, which now promises to become a…

  13. College Rankings. ERIC Digest.

    ERIC Educational Resources Information Center

    Holub, Tamara

    The popularity of college ranking surveys published by "U.S. News and World Report" and other magazines is indisputable, but the methodologies used to measure the quality of higher education institutions have come under fire by scholars and college officials. Criticisms have focused on methodological flaws, such as failure to consider differences…

  14. Latino College Completion: Texas

    ERIC Educational Resources Information Center

    Excelencia in Education (NJ1), 2012

    2012-01-01

    In 2009, Excelencia in Education launched the Ensuring America's Future initiative to inform, organize, and engage leaders in a tactical plan to increase Latino college completion. An executive summary of Latino College Completion in 50 states synthesizes information on 50 state factsheets and builds on the national benchmarking guide. Each…

  15. Improving College Freshman Retention

    ERIC Educational Resources Information Center

    Yu, Winnie Y.

    2012-01-01

    In recent years, access to higher education was greatly improved through public funding. This improvement is not matched by a similar increase in graduation rate. The purpose of this study is to examine what postsecondary institutions can do to improve college freshman retention. The conceptual framework was based on research on college student…

  16. Marketing the College.

    ERIC Educational Resources Information Center

    Theodossin, Ernest

    This document is one of three texts which comprise the written components of The Responsive College Programme dissemination materials. The program is designed to help colleges in the United Kingdom market themselves and their courses effectively, and this volume, which is freestanding and directed at both the general reader and the specialist,…

  17. Tedium in College.

    ERIC Educational Resources Information Center

    Pines, Ayala; Kafry, Ditsa

    Stress is a major sphere of influence on students that acts as the "invisible curriculum," and affects their reaction and adjustment to the whole college experience. There is a need to obtain systematic data about college students' experience of tedium, a particular form of stress, defined as the experience of physical, emotional, and mental…

  18. Bard College Shines

    ERIC Educational Resources Information Center

    Klier, Gerhard

    2012-01-01

    With its park-like campus location overlooking the Hudson River and Catskills Mountains in New York's Hudson Valley, it's no wonder that Bard College is committed to being green. At the liberal arts college in Annandale-on-Hudson, students learn and live in 25 geothermal buildings on campus that don't burn fossil fuels on site. Instead of driving…

  19. College Preparation Checklist

    ERIC Educational Resources Information Center

    Federal Student Aid, US Department of Education, 2013

    2013-01-01

    Why go to college? A higher education introduces students to new people and new experiences, and usually leads to a higher salary and lower chance of unemployment. This checklist will tell you how to get ready for college--and how the government will help you pay for it.

  20. Community College No Longer?

    ERIC Educational Resources Information Center

    Pluviose, David

    2008-01-01

    Community colleges have long been the destination of choice for immigrants seeking English-language skills, older nontraditional students seeking flexible class schedules, and students needing remediation to fill the gaps left by substandard K-12 schools. Nevertheless, many community colleges have expanded transfer-focused offerings in recent…