Copolyimide with a combination of flexibilizing groups

Copolyimides are prepared by reacting one or more aromatic dianhydrides with a meta-substituted phenylene diamine and an aromatic bridged diamine. The incorporation of meta-substituted phenylene diamine derived units and bridged aromatice diamine derived units into the linear aromatic polymer backbone results in a copolyimide of improved flexibility, processability, and melt-flow characteristics. The copolyimides are especially useful as thermoplastic hot-melt adhesives

A Study of Polymers Containing Silicon-nitrogen Bonds Annual Summary Report, 4 May 1966 - 3 Jun. 1967

Polymers containing silicon-nitrogen bond

Flow properties of a series of experimental thermoplastic polymides

The softening temperature to degradation temperature range of the polymers was about 440 to 650 K. All of the polymers retained small amounts of solvent as indicated by an increase in T(sub g) as the polymers were dried. The flow properties showed that all three polymers had very high apparent viscosities and would require high pressures and/or high temperatures and/or long times to obtain adequate flow in prepregging and molding. Although none was intended for such application, two of the polymers were combined with carbon fibers by solution prepregging. The prepregs were molded into laminates at temperatures and times, the selection of which was guided by the results from the flow measurements. These laminates had room temperature short beam shear strength similar to that of carbon fiber laminates with a thermosetting polyimide matrix. However, the strength had considerable scatter, and given the difficult processing, these polymides probably would not be suitable for continuous fiber composites

Vol. 2 Ch. 3 Ohio Hopewell Settlements on Brown\u27s Bottom

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Polyimide processing additives

A process for preparing polyimides having enhanced melt flow properties is described. The process consists of heating a mixture of a high molecular weight poly-(amic acid) or polyimide with a low molecular weight amic acid or imide additive in the range of 0.05 to 15 percent by weight of additive. The polyimide powders so obtained show improved processability, as evidenced by lower melt viscosity by capillary rheometry. Likewise, films prepared from mixtures of polymers with additives show improved processability with earlier onset of stretching by TMA

Hopewell Archeology: Volume 5, Number 1, June 2002

1. Preliminary Report, 2001 Investigations, Hopeton Earthworks Although the Hopewell mounds and earthworks of Ross County, Ohio, have been well known to the scientific community for more than 150 years, many simple and basic questions have yet to be answered about the sites, and about the people and culture who built them. Early archeological research focused on mounds and mortuary behavior (e.g., Squier and Davis 1848; Thomas 1894; Mills 1922; Moorehead 1922) and yielded a great deal of information about the artistic and ritual aspects of Hopewell life. Recent trends in Hopewell research have emphasized settlement pattern analysis and the relationships of the larger mound and earthwork sites to smaller villages and hamlets (Dancey and Pacheco 1997; Pacheco 1996). Comparisons among the large mound and earthwork sites have demonstrated some broad general similarities, but the structure and configuration of most sites are surprisingly diverse. The most thoughtful attempts to build broad explanatory models about the Hopewell world continue to be plagued by a lack of understanding about the chronology, structure, and function of individual earthwork sites. We believe this can be overcome with sustained, multi-year studies of individual earthwork sites. The Midwest Archeological Center has initiated a long-term study of the Hopeton Earthworks. This paper summarizes the results of research conducted in 2001. Research Area 2. The John L. Cotter Award for Excellence in National Park Service Archeology PREFACE: In honor of his long and distinguished career and his pioneering contributions to professional archeology within the National Park System, this unofficial annual award was established by agency staff as inspiration for student and professional archeologists to continue Dr. John L. Cotter’s model of excellence. PURPOSE: To recognize a specific archeological project within a unit of the National Park System, conducted by National Park Service staff, cooperator, permittee, or consultant as guided by senior National Park Service staff archeologist(s), each fiscal year, which meets or exceeds the criteria below. AWARD: The selected project lead person(s) will receive a commemorative non-monetary award and certificate bearing name(s) of principal investigator(s), project dates and field unit name. Presentation of award shall be at a suitable gathering of NPS archeological staff, followed by a brief project presentation. The award will be announced through official NPS public affairs channels. 3. Reply to Mark Lynott’s Review of Mysteries of the Hopewell In the previous issue of Hopewell Archeology (Vol. 4, No. 2, pp. 8-9) Dr. Mark Lynott reviewed Mysteries of the Hopewell: Astronomers, Geometers, and Magicians of the Eastern Woodlands by William F. Romain. Mr. Romain’s response to the review is presented here. 4. Meeting Calendar Midwest Archaeological Conference 48th Annual Meeting October 3-6, 2002 Ramada Hotel and Conference Center, Columbus, Ohio. Conference information is available at Southeastern Archaeological Conference 59th Annual Meeting November 6-9, 2002 Beau Rivage Resort and Casino, Biloxi, Mississippi. Conference information is available at Forthcoming The next issue of Hopewell Archeology will feature the discovery of a new earthen circle at the Hopewell site and an update on the continuing research at the Hopeton Earthworks. We are always looking for short contributions relating to Hopewell archeology. Potential authors should contact the editor. 5. Detecting the Shriver Circle Earthwork, Ross County, Ohio Ephraim Squier and Edwin Davis surveyed the Mound City Group area over 150 years ago. Although primarily interested in this earthwork complex, with its more than 20 mounds surrounded by a low embankment, their map also depicted an oblong circular enclosure located less than 1,500 feet from Mound City’s southern embankment wall. Named after Henry Shriver, owner of the surrounding farmland in the mid-1800s, the Shriver Circle consists of a large circular embankment flanked by an exterior ditch (Figure 1). Six gateways break the circumference of the circle, which has a diameter exceeding 1,000 feet. In the 1840s, the embankment measured 5 feet high and 25 feet wide at the base, while the ditch was 4 feet deep and 20 feet wide (Squier and Davis 1848:Plate XIX). Reference Cite

Murine models to investigate the influence of diabetic metabolism on the development of atherosclerosis and restenosis

This is an, un-copyedited, author manuscript that has been accepted for publication in the Frontiers in BioscienceAtherosclerosis and related forms of cardiovascular disease (CVD) are associated with several genetic and environmental risk factors, including hypercholesterolemia, diabetes mellitus (DM), hypertension, obesity and smoking. Human DM is a multisystem disorder that results from progressive failure of insulin production and insulin resistance. Most diabetic patients die from complications of atherosclerosis and CVD, and DM is also associated with increased risk of restenosis post-angioplasty. Furthermore, the incidence of DM, particularly type 2-DM, is expected to increase significantly during the next decades owing to the unhealthy effects of modern life-style habits (e.g., obesity and lack of physical exercise). Thus, it is of utmost importance to develop novel preventive and therapeutic strategies to reduce the social and health-care burden of CVD and DM. Although a number of physiological alterations thought to promote atherosclerosis have been identified in diabetic patients, the precise molecular mechanisms that link DM and atherosclerosis are largely unknown. Thus, the aim of this review is to discuss current murine models of combined DM and atherosclerosis and to explore how these experimental systems are being utilized to gain mechanistic insights into diabetes-induced neointimal lesion development, as well as their potential use in evaluating the efficacy of new therapies. Our discussion includes models generated by streptozotocin treatment and those resulting from naturally occurring or targeted mutations in the mouse.Work in the laboratory of the authors is supported by grants from the Spanish Instituto de Salud Carlos III (Red Temática de Investigación Cooperativa en Enfermedades Cardiovasculares RECAVA, Red de Grupos G03/212), and from the Spanish Ministry of Education and Science and the European Regional Development Fund (SAF2004-03057, SAF2005-06058). H. G.-N. is supported by an European Union Marie Curie postdoctoral fellowship.Peer reviewe

Geographic Variation in Agonistic Responses of Territorial Male Brook Sticklebacks, Culae Inconstans

Author Institution: Department of Biology, Wilmington College ; Department of Biology, Earlham CollegeTerritorial aggressive behavior was studied in male brook sticklebacks collected in Saskatoon, Saskatchewan; Oshkosh, Wisconsin; Ft. Atkinson, Wisconsin, and Urbana, Ohio. In the 20 h of observation 1,167 individual encounters with 3,305 separate aggressive displays were observed. Aggressive behavior was observed to be complex with at least 12 distinct aggressive display postures observed

Wagon-Based Silage Yield Mapping System

Rosana G. Moreira, Editor-in-Chief; Texas A&M UniversityThis is a paper from International Commission of Agricultural Engineering (CIGR, Commission Internationale du Genie Rural) E-Journal Volume 7 (2005): Wagon-Based Silage Yield Mapping System by W. S. Lee, J. K. Schueller, T. F. Burk

Business Risks: When IS Fails to Detect Circumvention Activities

A business must recognize and address various risk factors when establishing and maintaining its information system. The overall risk to management is that the control environment does not protect proprietary business data and the financial reporting system that produces financial statements and other information used by investors, creditors and regulatory agencies. These risks require that management implement efforts to ensure the integrity and effectiveness of control procedures over business activities while being aware of additional system issues such as failing to adequately consider other risks which are more business-oriented including the risk of failing to prevent or detect fraudulent or illegal activities. Worldwide in 2008 the value of economic data stolen was estimated to be a trillion dollars. After the public outcry from the business failures such as Enron there were efforts by the U.S. government, business community and the accounting profession to strengthen business control environments to better address such risk factors and thereby improving the quality of financial data. One result of these efforts has been that businesses are guided by the features of the Sarbanes-Oxley Act (2002) and efforts by COSO (2007) which indirectly allude to but do not specifically address these risk factors in a technology-based business environment. Currently almost all records maintained by a business organization are now in an electronic format with over two-thirds never converted to hard copy. The integral nature of a networked system necessitates having adequate control aspects that ensure the confidentiality of business proprietary data and to ensure this data is not stolen or misused. One aspect of this issue is that of insider hacking to transfer or misuse proprietary business data. This issue and recommendations for management and their auditors are reported in this research