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Search Results: 1 - 10 of 29032 matches for " Lihua Sun "
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Duchesnea Phenolic Fraction Inhibits Tumor Growth through Restoring the Th1/Th2 Balance in U14 Cervical Cancer Bearing Mice  [PDF]
Bo Peng, Qin Hu, Lihua Sun, Xinmin Liu, Jianrong Li, Qi Chang, Liwei Wang, Jintian Tang
Chinese Medicine (CM) , 2012, DOI: 10.4236/cm.2012.31007
Abstract: Duchesnea indica (Andr.) Focke has been traditionally used to treat cancer in Asian countries for centuries. In the present study, transplanted U14 cervical cancer mouse model was used to evaluate the antitumor and immunomodulatory activity of Duchesnea phenolic fraction (DPF). ELISA and RIA assay were employed to measured the serum concentration of Th1/Th2 cytokines (IL-2, IL-4, IFN-γ and TNF-α). Administration with 0.25 g/kg, 0.5 g/kg and 1 g/kg DPF significantly reduced the tumor weight by 34.37%, 43.89% and 56.28%, respectively, as compared to the tumor control group. Furthermore, the serum level of IL-2, IFN-γ and TNF-α increased and IL-4 level decreased in a dose-dependent manner during DPF treatment, indicating that the antitumor activity of DPF may be associated with the decrease of TNF-α level and restoration of the balance of Th1/Th2 cell responses. These data suggested that DPF, a mixture of plant polyphenols, had potent anticancer activity which was in part accomplished by its immunomodulatory ability.
Distinguishing the Effects of Cryosphere Change in the Background of Climate Change in China

LiHua Zhou,YanLing Zhu,XiKe Sun,

寒旱区科学 , 2010,
Abstract: Climate change has major impacts directly on the natural ecosystem and human society, of which the cryosphere is most easily affected because of its frangibility and sensitivity. Similarly, cryosphere change has numerous impacts on the natural ecosystem and human society, which may resemble an indirect influence of climate change. These two types of impacts, in shared fields, are distinguished in space and time by effective mechanisms and processes. Climate change has positive and negative impacts on some systems, which may be adjusted by cryosphere change. These indirect and direct impacts may be distinguished, and then correct policies and measures can be made against these changes.
A Security Scheme based on Location for Wireless Sensor Networks
Yuquan Zhang,Lihua Sun,Min You
Research Journal of Applied Sciences, Engineering and Technology , 2013,
Abstract: A pair wise key pre-distribution scheme based on the concept of the Overlap Key Sharing (OKS) and clusters for wireless sensor networks is proposed. This strategy divides the sensing area into square cells and logical groups and distributes key information to the sensor nodes by employing the OKS scheme. Sensor nodes establish their secure communication through using their keys. Analysis and comparison demonstrate that this scheme has good network connectivity, effectively reduces storage cost and enhances the security for WSNs and provides flexible security grades.
A new dynamic method for measuring hydrogen partial pressure in molten aluminum alloy
Sun Qian,Li Dayong,Wang Lihua
China Foundry , 2011,
Abstract: Hydrogen partial pressure is an important parameter to calculate hydrogen concentration levels in molten aluminum alloy. A new dynamic method for measuring hydrogen partial pressure in molten aluminum alloy is studied. Dynamic and rapid measurement is realized through changing the volume of the vacuum chamber and calculating the pressure difference ΔP between the theoretical and measured pressures in the vacuum chamber. Positive ΔP indicates hydrogen transmits from melt to vacuum chamber and negative ΔP means the reverse. When ΔP is equal to zero, hydrogen transmitted from both sides reached a state of dynamical equilibrium and the pressure in the vacuum chamber is equal to the hydrogen partial pressure in the molten aluminum alloy. Compared with other existing measuring methods, the new method can significantly shorten the testing time and reduce measuring cost.
Comparative Proteomic Analysis of Helicobacter pylori Strains Isolated from Chinese Patients  [PDF]
Boqing Li, Wanju Sun, Lihua He, Hong Jiang, Zhen Zhang, Donglong Du, Jianzhong Zhang
Pharmacology & Pharmacy (PP) , 2013, DOI: 10.4236/pp.2013.45A002
Abstract: Helicobacter pylori, the major cause of gastritis, peptic ulcer and gastric cancer, infects half of the world population, but only a few infections lead to serious disease. In order to investigate specific proteins related to the pathogenic difference of this bacterium, comparative proteome analyses of Helicobacter pylori C1 (isolated from patients with gastric cancer) and G1 (isolated from patients with gastritis) were performed using two-dimensional gel electrophoresis (2-DE) and matrix-assisted laser desorption/ionization time of flight mass spectrometry (MALDI-TOF MS). Four proteins (inorganic pyrophosphatase, 3-oxoadipate CoA-transferase subunit B, translation elongation factor, and aldo-keto reductase) were found only in Helicobacter pylori C1, and one protein (alkyl hydroperoxide reductase) was found in G1. Additionally, different isoelectric points (pI) of Hsp60 were observed from the two strains. Then we cloned and sequenced Hsp60 genes from forty-nine Helicobacter pylori isolated from gastric cancer and gastritis. Gene sequencing showed that one C→G single nucleotide polymorphism occurred in the 1399th nucleotide of Hsp60. These results indicate that pathogenic differences exist in various Helicobacter pylori isolated from Chinese patients.
Energy-Efficient Relay Selection and Optimal Relay Location in Cooperative Cellular Networks with Asymmetric Traffic
Wei Yang,Lihua Li,Wanlu Sun
Mathematics , 2010,
Abstract: Energy-efficient communication is an important requirement for mobile relay networks due to the limited battery power of user terminals. This paper considers energy-efficient relaying schemes through selection of mobile relays in cooperative cellular systems with asymmetric traffic. The total energy consumption per information bit of the battery-powered terminals, i.e., the mobile station (MS) and the relay, is derived in theory. In the Joint Uplink and Downlink Relay Selection (JUDRS) scheme we proposed, the relay which minimizes the total energy consumption is selected. Additionally, the energy-efficient cooperation regions are investigated, and the optimal relay location is found for cooperative cellular systems with asymmetric traffic. The results reveal that the MS-relay and the relay-base station (BS) channels have different influence over relay selection decisions for optimal energy-efficiency. Information theoretic analysis of the diversity-multiplexing tradeoff (DMT) demonstrates that the proposed scheme achieves full spatial diversity in the quantity of cooperating terminals in this network. Finally, numerical results further confirm a significant energy efficiency gain of the proposed algorithm comparing to the previous best worse channel selection and best harmonic mean selection algorithms.
Reliable Multicasting for Device-to-Device Radio Underlaying Cellular Networks
Wei Yang,Wanlu Sun,Lihua Li
Computer Science , 2010,
Abstract: This paper proposes Leader in Charge (LiC), a reliable multicast architecture for device-to-device (D2D) radio underlaying cellular networks. The multicast-requesting user equipments (UEs) in close proximity form a D2D cluster to receive the multicast packets through cooperation. In addition to receiving the multicast packets from the eNB, UEs share what they received from the multicast on short-range links among UEs, namely the D2D links, to exploit the wireless resources a more efficient way. Consequently, we show that utilizing the D2D links in cellular networks increases the throughput of a multicast session by means of simulation. We also discuss some practical issues facing the integration of LiC into the current cellular networks. In particular, we propose efficient delay control mechanism to reduce the average and maximum delay experienced by LiC users, which is further confirmed by the simulation results.
Evaluation of the Impact of Government Policy on the Overuse of Groundwater in the Minqin Basin in China  [PDF]
Lihua Yang
Computational Water, Energy, and Environmental Engineering (CWEEE) , 2013, DOI: 10.4236/cweee.2013.22007
Abstract:

The existing literature simply concludes that the irrational behaviors of local people and natural factors are the major reasons for overuse of groundwater. Using the OLS and ARIMA (BJ) Statistical Methods and Trend Analyses, this article finds that government policy, as measured by four proxy variables, is a very important factor that strongly influences the overuse of groundwater at the collective level. This means the government is a very important actor in the game of groundwater usage. Although these findings cannot clearly separate government effects from local effects, using a Trend Analysis, they reveal that these significant effects are strictly consistent with variations in government policy. Moreover, they show that government policy effective at the county level strongly impacts the overuse of ground-water by influencing the behavior of the local people and that policy at the operative level impacts four policy domains: population, cultivated land, water assignments and peasant income.

Excessive Privatization in an International Mixed Oligopoly: Normative View  [PDF]
Lihua Han
Theoretical Economics Letters (TEL) , 2015, DOI: 10.4236/tel.2015.55075
Abstract: This paper analyzes a mixed oligopoly model with two countries each with public and private firms competing in a third country market. We formulate a third country model often used in the field of international trade, and show that there is excessive privatization if the governments adopt the degree of privatization as a policy device.
RETRACTED: Ownership Property, Product Market Competition and Auditor Choice  [PDF]
Lihua Liu
Journal of Human Resource and Sustainability Studies (JHRSS) , 2016, DOI: 10.4236/jhrss.2016.43020
Abstract: Short Retraction Notice

There are substantial issues in the manuscript.

This article has been retracted to straighten the academic record. In making this decision the Editorial Board follows COPE's Retraction Guidelines. The aim is to promote the circulation of scientific research by offering an ideal research publication platform with due consideration of internationally accepted standards on publication ethics. The Editorial Board would like to extend its sincere apologies for any inconvenience this retraction may have caused.

Editor guiding this retraction: Prof. Olivier Boiral (Editorial Board Member of JHRSS)

Please see the article page for more details. The
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