Polyimides containing the cyclobutene-3,4-dione moiety

In the present invention, linear aromatic polyimides containing the cyclobutene-3,4-dione moiety were produced from the reaction of a substituted or unsubstituted 1,2-bis(4-aminoanilino) cyclobutene-3,4-dione (SQDA) with various aromatic dianhydrides. These polymers had high molecular weights and their glass transition temperatures (Tgs) were greater than 500 C. Despite the very high Tg, these polymers exhibited excellent adhesion to glass. In addition, the films of these polyimides increased in flexibility with increasing cure temperatures. The novelty of this invention lies in the linear aromatic polyimide containing the cyclobutene-3,4-dione moiety. The presence of this moiety causes such changes in properties as Tgs greater than 500 C, excellent adhesion to glass, and increased flexibility with increasing cure temperatures

Processing for maximizing the level of crystallinity in linear aromatic polyimides

The process of the present invention includes first treating a polyamide acid (such as LARC-TPI polyamide acid) in an amide-containing solvent (such as N-methyl pyrrolidone) with an aprotic organic base (such as triethylamine), followed by dehydrating with an organic dehydrating agent (such as acetic anhydride). The level of crystallinity in the linear aromatic polyimide so produced is maximized without any degradation in the molecular weight thereof

Case Note: Transportation Law - Urban Mass Transportation Act - The Absence of Statutory Provisions Relating to Standing and Judicial Review Does Not Preclude a Claimant from Seeking Relief in Federal Court

This case note by Terry L. Barnich analyzes the Seventh Circuit\u27s decision in Bradford School Bus Transit, Inc. v. Chicago Transit Authority, 537 F.2d 943 (7th Cir. 1976), cert denied, 97 S. Ct. 797 (1977). The plaintiff, a private bus company, sought a declaration that the Chicago Transit Authority violated section 1602(a) of the Urban Mass Transportation Act when it competed with the private bus line for a contract with the Chicago Board of Education. The United States District Court for the Northern District of Illinois declared that the plaintiff lacked standing under the Act and dismissed the complaint. The Seventh Circuit held that plaintiff had sufficient standing to sue under the Act. It concluded that plaintiff had adequately alleged an unjust injury due to agency action, and had sufficiently demonstrated that its interests were protected by the Act\u27s relevant provision. Nevertheless, it refused to review the administrative action because complaint procedures and remedies were available and plaintiff was required to exhaust those administrative remedies

Dean and Hearlson\u27s How youth ministry can change theological education – If we let it (Book Review)

A review of Dean, K.C., & Hearlson, C.L. (Eds.). (2016). How youth ministry can change theological education – If we let it. Grand Rapids, MI: William B. Eerdmans Publishing. 331 pp. $30.00. ISBN 978080287193

DNA unwinding component of the nonhistone chromatin proteins

A subclass of nonhistone chromatin proteins from rat liver, previously shown to exhibit high affinity for DNA, has been fractionated by single-stranded DNA-agarose affinity chromatography. The protein fraction that bound to DNA-agarose in 0.19 M NaCl-buffer and was eluted with 2 M NaCl-buffer is enriched for a protein component of approximately 20,000 daltons and exhibits preferential binding to denatured DNA. This nonhistone protein fraction specific for single strands binds to DNA in a non-species-specific manner, and causes helix-coil transition of synthetic poly[d(A-T)· d(A-T)] at 25 degrees, as indicated by the increase in absorbance of ultraviolet light at 260 nm. The observed hyperchromicity does not result from any nuclease activity in the protein fraction, because addition of Mg+2 results in partial hypochromic shift, and the protein/DNA complex is retained by nitrocellulose filters

Critical issues in library management : organizing for leadership and decision-making

Papers from the thirty-fifth Allerton Institute. [October 24-26, 1993]Includes bibliographical references

When Alcoholism Affects Memory Functions: MRI of the Brain.

The development of modern imaging techniques makes it possible to examine directly the relationship between brain abnormalities and memory impairment. Alcoholic amnesics may perform normally on certain tests (priming tasks) that require implicit (unconscious) memory, even though they may not be able consciously to recall the memory. Researchers have therefore postulated the existence of multiple memory mechanisms. Magnetic resonance imaging (MRI) observations suggest that independent memory mechanisms are not necessary to explain the dissociation between explicit and implicit memory. Alcoholic amnesics appear to suffer from damage to structures in two areas of the brain, affecting two separate processing components that are both required in most priming tasks: a stimulus processing component and a memory processing component

Computational fluid dynamics drag prediction: Results from the Viscous Transonic Airfoil Workshop

Results from the Viscous Transonic Airfoil Workshop are compared with each other and with experimental data. Test cases used include attached and separated transonic flows for the NACA 0012 airfoil. A total of 23 sets of numerical results from 15 different author groups are included. The numerical method used vary widely and include: 16 Navier-Stokes methods, 2 Euler boundary layer methods, and 5 potential boundary layer methods. The results indicate a high degree of sophistication among the numerical methods with generally good agreement between the various computed and experimental results for attached or moderately separated cases. The agreement for cases with larger separation is only fair and suggests additional work is required in this area