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Search Results: 1 - 10 of 45834 matches for " Jiang He "
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Nickase-dependent isothermal DNA amplification  [PDF]
Yan He, Tao Jiang
Advances in Bioscience and Biotechnology (ABB) , 2013, DOI: 10.4236/abb.2013.44070
Abstract:

We developed a nicking endonuclease dependent DNA amplification (NDA), using Nt.BstNBI to catalyze single-stranded nick on double-stranded DNA, and Bst DNA polymerase to make extension while sealing the nick and displacing the downstream strand. The displaced single-stranded DNA thereby serves as template for primers hybridization and extension, resulting in exponential synthesis of target DNA under isothermal condition. Over 105 folds target DNA amplification can be achieved in 30 minutes, generating DNA product suitable for both diagnosis and DNA cloning. This NDA strategy does not require thermal cycling or prerequisite nucleotides modification, making it suitable for application in the field and at the point-of-care.

Research on Downlink Precoding for Interference Cancellation in Massive MIMO Heterogeneous UDN  [PDF]
Hua He He, Jing Jiang, Rong Jin
Journal of Applied Mathematics and Physics (JAMP) , 2018, DOI: 10.4236/jamp.2018.61026
Abstract: In order to solve the data surge brought by largescale increasing of mobile de-vices, Massive MIMO ultra dense networking can greatly improve the system spectral efficiency and energy efficiency. It plays an important role in coping with the exponential growth of the business, but also brought big problems and challenges. For heterogeneous ultra dense networks, both macro and femto users are facing with both the cross-layer interference and co-layer in-terference. The precoding technology studied in this paper resolves the cross-layer interference and co-layer interference for macro users and femto users, and lays a theoretical foundation for the deployment of heterogeneous and ultra dense networks.
The Effects of Long Memory in Price Volatility of Inventories Pledged on Portfolio Optimization of Supply Chain Finance  [PDF]
Juan He, Jian Wang, Xianglin Jiang
Journal of Mathematical Finance (JMF) , 2016, DOI: 10.4236/jmf.2016.61014
Abstract:

Due to the illiquidity of inventories pledged, the essential of price risk management of supply chain finance is to long-term price risk measure. Long memory in volatility, which attests a slower than exponential decay in the autocorrelation function of standard proxies of volatility, yields an additional improvement in specification of multi-period volatility models and further impact on the term structure of risk. Thus, long memory is indispensable to model and measure long-term risk. This paper sheds new light on the impact of the existence and persistence of long memory in volatility on inventory portfolio optimization. Firstly, we investigate the existence of long memory in volatility of the inventory returns, and examine the impact of long memory on the modeling and forecasting of multi-period volatility, the dependence structure between inventory returns and portfolio optimization. Secondly, we further explore the impact of the persistence of long memory in volatility on the efficient frontier of inventory portfolio via a data generation process with different long memory parameter in the FIGARCH model. The extensive Monte Carlo evidence reveals that both GARCH and IGARCH models without accounting for long memory will misestimate the actual long-term risk of the inventory portfolio and further bias the efficient frontier; besides, through A sensitive analysis of long memory parameter d, it is proved that the portfolio with higher long memory parameter possesses higher expected return and lower risk level. In conclusion, banks and other participants will benefit from the long memory taken into the long-term price risk measure and portfolio optimization in supply chain finance.

Evidence for tritium production in the Earth’s interior
SongSheng Jiang,Ming He
Chinese Science Bulletin , 2008, DOI: 10.1007/s11434-008-0032-z
Abstract: We have made a new investigation on the vertical profiles of tritium and helium isotopes in Lakes Van and Nemrut (Eastern Turkey), using experimental data from the reference by Kipfer et al. for study of long-term vertical mixing and deep water renewal in Lake Van. Lakes Van and Nemrut are crater lakes. Lake Nemrut is at the western border of Lake Van. The 3He and 4He are injected at the bottom of Lakes Van and Nemrut, and the both helium isotopes are confirmed from the mantle source. From 3H (tritium) data in Lakes Van and Nemrut, we have observed “3H anomaly” at the vertical profile of 3H concentrations in Lake Nemrut. The 3H concentration at the lake bottom is 10% higher than at the surface. The difference of 3H concentrations between surface and bottom is about 3.7±1.2 TU. This excess 3H should be injected from the lake bottom. An investigation on the origin of the injected tritium has been made. The results show the conventional origins are excluded, such as residence of precipitation tritium from nuclear testing in the early 1950s–1960s and tritium from known nuclear reactions. Based on the correlation of excess 3H with 3He and heat flow in Lake Nemrut, we infer that the 3He and 3H might be all from the mantle source, and produced by the supposed natural-nuclear-fusion, which might occur in an environment rich in water (H) and (U + Th) at high temperature and high pressure in the deep Earth. Detection of tritium in the Earth’s interior is a key evidence for exploration of natural nuclear fusion in the deep Earth. Based on the published data, we have found that the excess 3He and 3H injected at the bottom of Lake Laacher (Germany) were also released from the mantle source. The present work will be helpful to the further study of mechanism of natural nuclear fusion in the Earth’s interior.
Photophysics, photochemistry and photobiology of hypocrellin photosensitizers
Lijin Jiang,Yuying He
Chinese Science Bulletin , 2001, DOI: 10.1007/BF03183199
Abstract: Hypocrellins are novel photosensitizers from China, which are demonstrated to have significant antitumor and anti-virus activity and to be potential photodynamic therapy (PDT) agents. As compared with hematoporphyrin, the only approved photosensitizer, hypocrellins have several advantages, such as easy preparation and easy purification, high triplet quantum yield, high singlet-oxygen quantum yield, high phototoxicity but low dark toxicity, and rapid clearance from normal issues. This article reviews briefly the photophysics, photochemistry and photobiology of hypocrellins on the basis of the domestic and international research results.
N′-[(5-Methyl-2-furyl)methylene]thiophene-2-carbohydrazide
Jin-He Jiang
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810010810
Abstract: In the title compound, C11H10N2O2S, the dihedral angle between the five-membered aromatic rings is 10.24 (12)°. In the crystal structure, molecules are linked by bifurcated N—H...(O,N) hydrogen bonds, generating [001] chains.
N′-(4-Chlorobenzylidene)thiophene-2-carbohydrazide
Jin-He Jiang
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810010615
Abstract: In the title compound, C12H9ClN2OS, the dihedral angle between the aromatic rings is 9.78 (11)°. In the crystal structure, inversion dimers linked by pairs of N—H...O hydrogen bonds occur, generating R22(8) loops. Weak aromatic π–π stacking [centroid–centroid separations = 3.7210 (15) and 3.8706 (15) ] also occurs.
N′-(4-Bromobenzylidene)thiophene-2-carbohydrazide
Jin-He Jiang
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810010603
Abstract: In the title compound, C12H9BrN2OS, the dihedral angle between the aromatic rings is 10.0 (2)°. In the crystal structure, inversion dimers linked by pairs of N—H...O hydrogen bonds occur, generating R22(8) loops. Weak aromatic π–π stacking [centroid–centroid separations = 3.825 (3) and 3.866 (3) ] also occurs.
N′-(4-Chlorobenzylidene)furan-2-carbohydrazide monohydrate
Jin-He Jiang
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810005532
Abstract: In the title compound, C12H9ClN2O2·H2O, the dihedral angle between the aromatic rings is 13.9 (2)° and an intramolecular N—H...O hydrogen bond occurs. In the crystal structure, the components are linked by N—H...O, O—H...O and C—H...O hydrogen bonds.
N′-[1-(2-Hydroxyphenyl)ethylidene]thiophene-2-carbohydrazide
Jin-He Jiang
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536810050002
Abstract: The title compound, C13H12N2O2S, was prepared by the reaction of 1-(2-hydroxyphenyl)ethanone and thiophene-2-carbohydrazide. The dihedral angle between the benzene and thiophene rings is 10.07 (17)°. An intramolecular O—H...N hydrogen bond may influence the molecular conformation. In the crystal, molecules are linked by N—H...O hydrogen bonds into chains along [010].
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