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THE HULL NUMBER OF POWERS OF CYCLES
Al-Ezeh, Hasan,Ghanem, Manal,Rwalah, Jameel Korean Mathematical Society 2017 대한수학회논문집 Vol.32 No.4
Let $C_n$ be the cycle graph of order n on the vertices $v_0,v_1,{\ldots},v_n$ and $C^k_n$ be the k-th power of $C_n$. In this article we determine the hull-number of $C^k_n$.
Experimental Study on Strength Gaining Characteristics of Concrete using Portland Composite Cement
Md. Alhaz Uddin,Mohammed Jameel,Habibur Rahman Sobuz,Md. Shahinul Islam,Noor Md. Sadiqul Hasan 대한토목학회 2013 KSCE JOURNAL OF CIVIL ENGINEERING Vol.17 No.4
This study deals with experimental investigation of strength gaining characteristics of concrete made with Portland Composite Cement (PCC) and Ordinary Portland Cement (OPC). Compressive strength of concrete is often considered as a measure to determine the rate of strength gain of concrete with age and different cement composition. Strength developments of five concrete types have been investigated in terms of cement content and curing duration. Experimental observations on 495 specimens reveal that the early age strength of PCC concrete is lower than that of OPC concrete. Based on the test results, lack of proper pozzolanic reaction in the presence of fly ash in PCC concrete strength is lower at early age. The pozzolanic activity of fly ash also contributes to the strength gain at later stages of continuous curing. This study also concludes that drying ambient conditions reduce the strength potential of PCC concrete as the secondary (pozzolanic) reaction fails to contribute to the development of strength.
Ying Xue,Richard Phillips,Hou-min Chang,Hasan Jameel 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.2
One challenge in making bioethanol production economical is to increase total solids in hydrolysis system while maintaining sugar conversion efficiency. Because the removal of excess water from hydrolysate requires enormous amounts of heat, large volume of reaction towers and high capital expenditure (CAPEX) for equipment, a lengthy operating time, and high operating costs. When solids loading in hydrolysis system increased from 5% to 20% with no mixing strategies, final sugar conversion decreased markedly. If cellulase is mixed with pulp at 5% solids and pressed to 20% solids, then 80% of the cellulase retained in the pulp thinned down the pulp mixture in 2 h. This thinning effect enabled additional cellulase, xylanase, and b-glucosidase to be mixed into the slurry. Sugar concentration was significantly improved; from 26 g/L to 121 g/L, while sugar conversion was remained as enzymatic hydrolysis with 5% total solids enzymatic hydrolysis. A US patent has been granted to NCSU for this concept and licenses have been granted to various companies.
The Effect of Cellulase on the Pore Structure of Cellulose Fibers
SUNKYU PARK,RICHARD A. VENDITTI,DAVID G. ABRECHT,HASAN JAMEEL,JOEL J. PAWLAK,JUNG MYOUNG LEE 한국펄프·종이공학회 2006 한국펄프종이학회 기타 간행물 Vol.- No.-
The surface and pore structure of cellulose fibers have a significant impact on the properties and performance in applications. Cellulase enzymatic hydrolysis of cellulose fibers can result in changes to the surface and pore structure, thus providing a useful tool for fiber modification. This research characterizes these changes using various test methods such as fiber dimension, water retention value, hard-to-remove water content, freezing and non-freezing bound water content, polymer adsorption, and crystallinity index. For a high-dosage enzyme treatment (0.10 g/g), the fiber length was significantly decreased and the fibers were ‘cut’ in the cross direction, not in the axial direction. The swelling capacities as measured by the WRV and HR water content increased for the high-dosage treatment. Three independent measurements (non-freezing bound water, polymer adsorption, and crystallinity index) are in good agreement with the statement that the amorphous regions of cellulose fibers are a more readily available substrate relative to crystalline regions. Based on the experimental results obtained herein, a model was proposed to explain surface and pore structure modification of cellulose fibers via enzymatic treatment.
박현지,( David Cruz ),( Phoenix Tiller ),( Ashutosh Mittal ),( David K. Johnson ),( Hasan Jameel ),( Richard Venditti ),( Sunkyu Park ) 한국공업화학회 2023 한국공업화학회 연구논문 초록집 Vol.2023 No.0
paper sludge, ash, hydrocarbons, sustainable aviation fuel