71 research outputs found
Single-Step Methylation of Chitosan Using Dimethyl Carbonate as a Green Methylating Agent
No full textN,N,N-Trimethyl chitosan (TMC) is one chitosan derivative that, because of its improved solubility, has been studied for industrial and pharmaceutic applications. Conventional methods for the synthesis of TMC involve the use of highly toxic and harmful reagents, such as methyl iodide and dimethyl sulfate (DMS). Although the methylation of dimethylated chitosan to TMC by dimethyl carbonate (DMC, a green and benign methylating agent) was reported recently, it involved a formaldehyde-based procedure. In this paper we report the single-step synthesis of TMC from chitosan using DMC in an ionic liquid. The TMC synthesised was characterised by 1H NMR spectroscopy and a functionally meaningful degree of quaternisation of 9% was demonstrated after a 12-h reaction time
Letter from Al G. Hemming to Carson Estate Company, December 24, 1946
No full textRequests new Lease #17-B agreement for Tom Kurishige, formerly leased by Paul Hernandez. Requests an increase in the land and new lease dates
Uncoverings: The Research Papers of the American Quilt Study Group, Volume 18 (1997), Includes Cumulative Author Index, Volumes 1-17
No full textPreface by Virginia Gunn
Research Papers
The Quilting Records of Rachel Adella Jewett and Lucyle Jewett by Sara Reimer Farley and Nancy Hornback
Art Quilt Makers and Their Critique Groups by Barbara Carow
The Sunday Friends: The Group and Their Quilts by Lorre M. Weidlich
Quilt Ownership and Sentimental Attachments: The Structure of Memory by Catherine A. Cerny
Feed Sacks in Georgia: Their Manufacture, Marketing, and Consumer Use by Ruth Rhoades
Hawaiian Outline-Embroidered Quilts by Loretta B. Hammonds Woodard
Waccamaw-Siouan Quilts: A Model for Studying Native American Quilting by Jill Hemming
Seminar Keynote Address
Women\u27s Quilts and Diaries: Creative Expression and Personal Resource by Gayle R. Davis
Authors and editor
Index
Cumulative author index, volumes 1-17 (1980-1996
Curving Concrete: A Method for Manufacturing Double Curved Precast Concrete Panels using a Flexible Mould
No full textFree form architecture with complex geometry brings along new challenges for manufacturers of building components. This paper describes the application of structural mechanics to predict the behaviour of an elastic mould surface, used as formwork for the manufacturing of double curved panels in precast concrete. Results are presented of laboratory experiments with a formwork to validate the model. The authors demonstrate that the model together with the mould prototype enable a flexible yet straightforward production method for curved concrete products that is applicable in many free form architecture projects nowadays.Structural and Building EngineeringCivil Engineering and Geoscience
Letter from Carson Estate Company to Mr. A. [Al] G. Hemming, May 12, 1942
No full textLetter refers to enclosures of lease agreements. Requests clarification on a new agreement for Lease #13 to new tenant and the cancellation of Leases #13-A and #13-B for Japanese American farmers. Handwritten responses on the document clarify the letter with "yes, this [is] a combination of 13 A & 13 B. Cancel The Japs." Refers to the mass removal ("evacuation") of persons of Japanese ancestry from the West Coast as directed by President Franklin D. Roosevelt, Executive Order 9066. Lease #13 A is Item 1969-I
Letter from [Minna A. Newman], Carson Estate Company to Mr. A. [Al] G. Hemming, February 1, 1946
No full textRefers to two enclosed leases: #3-B for "G. V. Voight" and #1 for John Hajime Masuzumi
Letter from [John Victor] Carson, Carson Estate Company to Mr. A. [Al] G. Hemming, Carson Estate Company, February 5, 1943
No full textA request to deliver a John Deere tractor left in his care B O. Kuhawara to Mr. C. H. Chinn
Exploring Opportunities for Platinum Nanoparticles Encapsulated in Porous Liquids as Hydrogenation Catalysts
No full textInfluence of Tolerancing Methods and Aspects of Perceived Quality on Side Closures of Luxury Cars
No full textAbstractFor a customer, one of the most appealing areas aesthetically in a passenger vehicle is the frontal and side closure of the vehicle. Especially the way the precision tolerances are achieved in cars. Hence the precision tolerance gives the aesthetic appeal for gap and flushness. It plays a vital role in the saleability of the vehicle. There are three priority areas of a passenger car which influences the prospective customer. The priority 1 includes the front-rear door and headlamp-hood interfaces. The priority 2 includes the A pillar to roof and front wind shield interfaces. The priority 3 includes door to rocker moulding and hood to grille interfaces. Here the importance is given to the customer's view perspective. For example, in a side closures (car door assembly), the front-rear door interfaces which lies between the B pillar and the rear door region is given importance since it has the high priority as seen by the customer (Priority1).Whereas the door to rocker moulding interfaces which lies on the bottom surface of the car is given low priority (Priority 3). Based on these priorities the gap and flushness effectively achieved through the tolerance management. This research paper aims to investigate the influences of tolerancing methods and aspects of perceived quality on the side closures with respect to computer aided tolerancing, hinge positioning, Striker and hinge adjustments and hemming. These influences in turn gives the side closures superior aesthetic appeal, loyal customers and winning edge in the saleability of luxury cars in the global market
Pliocene–Pleistocene landscape evolution and watershed reorganization east of the central Andes in Argentine Patagonia
No full textBook Chapter: Uplift of the central Andes during the Miocene was followed by large-scale reorganization of Atlantic-draining rivers in Argentine Patagonia. Here, we document the abandonment of one large river in the late Pliocene and the establishment of the modern drainage in the Early Pleistocene. A chronology for these events is provided by 40Ar/39Ar ages on basalt flows. Remnants of the Pliocene paleovalley system are well preserved in the Lago Cardiel–Gobernador Gregores area, where they are eroded into flat-lying basalt flows dated from ca. 13.9 Ma to 8.6 Ma. Younger basalts that erupted onto the abandoned floor of the paleovalley are as young as 3.7 Ma. Abandonment of the Pliocene paleovalley and establishment of the modern Río Chico and Río Shehuen catchments happened near the close of the Pliocene when Andean glaciers incised the east-sloping pediment on which the late Miocene drainage was established. Lago Cardiel sits within a large endorheic basin that is inset into the late Pliocene paleovalley. The basin began to develop just before 4 Ma, after the paleovalley was abandoned. It became larger and deeper during the Pleistocene due to mass movements along its margins, deflation of the basin floor during times when Lago Cardiel was dry or nearly dry, and possibly lowering along bounding faults. The Pliocene–Pleistocene landscape and drainage changes that we have documented are not unique to the Lago Cardiel–Gobernador Gregores area; similar changes are apparent elsewhere in Patagonia east of the crest of the Andes.
Book: Stephen C. Porter was an international leader in Quaternary science for several decades, having worked on most of the world’s continents and having led international organizations and a prominent interdisciplinary journal. His work influenced many individuals, and he played an essential role in linking Chinese Quaternary science with the broader international scientific community. This volume brings together nineteen papers of interdisciplinary Quaternary science honoring Porter. Special Paper 548 features papers from six continents, on wide-ranging topics including glaciation, paleoecology, landscape evolution, megafloods, and loess. The topical and geographical range of the papers, as well as their interdisciplinary nature, honor Porter’s distinct approach to Quaternary science and leadership that influences the field to this day.book chapterPublished
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