137 research outputs found
Find Modern Turning From the Rising Trend of Giving Consideration to the Han and Song Compromise School of the Academic History in the Qing Dynasty
No full textAs one of the important schools, the Han and Song compromise school was rising in the mid and late Qing Dynasty and it had lasted for hundreds of years. The reasons of the rise were very complex, but the remarks of Weng Fanggang (翁方綱) , Zhang Xuecheng (章學誠) and Xu Zongyan (許宗彥) of the Qianlong period undoubtedly enlightened the development of the school. Weng Fanggang considered that establishing a union of the Han school and the Song school was better for the both. Zhang Xuecheng thought that separating the Han school and the Song school would hurt the two. Xu Zongyan believed that the academic level of the Han school was lower and it should unite with the Song school to reach the way of sage (聖學). Although there were some differences in their opinions, they all wanted to correct the bias of the Han school and overcome shortcomings of the Song school. Their thoughts showed the changes of academic views from tradition to modernity in the Qing Dynasty. For us, studying this topic still has realistic significance
Induction and preliminary characterization of a novel halophage SNJ1 from lysogenic Natrinema sp F5
No full textHalophage SNJ1 was induced with mitomycin C from Natrinema sp. strain F5. The phage produces plaques on Natrinema sp. strain J7 only. The phage has a head of about 67 nm in diameter and a tail of 570 nm in length and belongs morphologically to the family Siphoviridae. The phage is strongly salt dependent; NaCl concentration affects the integrity of SNJ1, phage adsorption, and plaque formation. The optimal NaCl concentration for phage adsorption and plaque formation is 30% and 25%, respectively.Halophage SNJ1 was induced with mitomycin C from Natrinema sp. strain F5. The phage produces plaques on Natrinema sp. strain J7 only. The phage has a head of about 67 nm in diameter and a tail of 570 nm in length and belongs morphologically to the family Siphoviridae. The phage is strongly salt dependent; NaCl concentration affects the integrity of SNJ1, phage adsorption, and plaque formation. The optimal NaCl concentration for phage adsorption and plaque formation is 30% and 25%, respectively
Influence of Solid Filler on the Rheological Properties of Propellants Based on Energetic Thermoplastic Elastomer
No full textGlycidyl azide polymer-energetic thermoplastic elastomer propellant (GAP-ETPE) has high development prospects as a green solid propellant, although the preparation of GAP-ETPE with excellent performance is still a challenge. Focusing on the demand of high-strength solid propellants for free-loading rocket motors, a GAP-ETPE model propellant with excellent overall performance was prepared in this work, and the influence of adhesive structure characteristics on its fluidity was studied. Furthermore, the influence of filler on the rheological properties of the model propellant was investigated by introducing hexogen (RDX) and Al, and a corresponding two-phase model was established. The results may provide a reference for the structural design, molding process, and parameter selection of high-performance GAP-based green solid propellants
Research on Mechanical Properties and Sensitivity of a Novel Modified Double-Base Rocket Propellant Plasticized by Bu-NENA
No full textThe research and development of rocket propellants with a high solid content and superior mechanical and security performance is urgently needed. In this paper, a novel extruded modified double-base (EMDB) rocket propellant plasticized by N-butyl-N-nitratoethyl nitramine (Bu-NENA) was prepared to overcome this challenge. The results indicated that Bu-NENA decreased the mechanical sensitivity successfully, contributing to the mechanical properties against traditional nitroglycerin (NG) based EMDB propellants, while hexogen (RDX), which is beneficial to propellant energy, was not conducive to the elongation and sensitivity of the propellants. By contrast with the blank group (NG-based EMDB propellant, R0), the elongation of the optimized propellant at −40 °C was promoted by 100% from 3.54% to 7.09%. Moreover, the β-transition temperature decreased from −33.8 °C to −38.1 °C due to superior plasticization by Bu-NENA, which represents a better toughness. The friction sensitivity dropped by 100% from 46% to 0%. Simultaneously, the height for 50% probability of explosion (H50) increased by 87.2% from 17.2 cm to 32.2 cm. The results of this research could be used to predict a potential prospect in tactical weapons
Optimization and Experimental Study of Penetration Depth of Pocket Penetrometer
No full textThe pocket penetrometer has become an ideal tool for the rapid testing of soil parameters in the field due to its portability, ease of use, and cost effectiveness, but there is still room for improvement in its accuracy. In this study, a penetration test on red clay was investigated by increasing the penetration depth and combining the self-designed penetrometer, sample preparation method, and data analysis method. The improved sample preparation technique performs well in improving sample uniformity and preparation efficiency. The quantitative processing of the penetration curves improves the objectivity and accuracy of the test results. The penetration test results of various reshaped soils showed that the relationships between liquidity index, shear strength, and penetration resistance were less affected by the liquid–plastic interface. In addition, the penetration test results of remolded soils and in situ soils showed that the empirical formulas are still informative in evaluating the shear strength of soils despite the differences in the test soils
lip2, a novel lipase gene cloned from Aspergillus niger exhibits enzymatic characteristics distinct from its previously identified family member
No full textWe have cloned a novel lipase gene, lip2, from Aspergillus niger and expressed it in Escherichia coli. Upon purification of the recombinant Lip2 protein, its properties were characterized. In comparison with a previously identified lipase Lip1, both enzymes are acid lipases (optimal pH <6.5), Ca2+-dependent and PMSF-sensitive, but have different molecular weights (35 and 43 kDa), optimal substrate spectra (C10 and C8), optimal reaction temperatures (45 and 50°C) and thermal stability. Circular dichroism spectroscopy revealed that Lip2 contains a typical Ca2+-active site. This first report on the cloning of the Lip2 gene and its enzymatic characteristics may greatly facilitate its potential industrial application.</p
Assessment of Computed Tomography-Defined Muscle and Adipose Tissue Features in Relation to Length of Hospital Stay and Recurrence of Hypertriglyceridemic Pancreatitis [Corrigendum]
No full textYu H, Huang Y, Chen L, Shi L, Yang Y, Xia W. Int J Gen Med. 2021;14:1709–1717.
The authors have advised the author list, affiliations and correspondence section on page 1709 is incorrect. The correct details are as follows.
Weizhi Xia1
Yingbao Huang2
Lifang Chen2
Liuzhi Shi3
Yunjun Yang2
Huajun Yu4
1Department of Radiology, The Second Affiliated Hospital of Wenzhou Medical University, Wenzhou, People’s Republic of China; 2Department of Radiology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, People’s Republic of China; 3Department of Clinical Laboratory, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, People’s Republic of China; 4Department of Pancreatitis Center, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, People’s Republic of China
Correspondence: Huajun Yu
Department of Pancreatitis Center, The First Affiliated Hospital of Wenzhou Medical University, Nan Bai Xiang Road, Quhai District, Wenzhou 325000, People’s Republic of China
Email [email protected]
The authors apologize for these errors.
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Methoxycarbonyl-terminated hyperbranched poly(amine-ester) as templates for synthesis of silver nanoparticles
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