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Search Results: 1 - 10 of 110999 matches for " Meng Zhang "
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The Fractal and the Recurrence Equations Concerning the Integer Partitions  [PDF]
Meng Zhang
Advances in Pure Mathematics (APM) , 2018, DOI: 10.4236/apm.2018.86036
Abstract: This paper introduced a way of fractal to solve the problem of taking count of the integer partitions, furthermore, using the method in this paper some recurrence equations concerning the integer partitions can be deduced, including the pentagonal number theorem.
Preparation of KOH/CaO/C Supported Biodiesel Catalyst and Application Process  [PDF]
Jianwei Zhang, Qingming Meng
World Journal of Engineering and Technology (WJET) , 2014, DOI: 10.4236/wjet.2014.23020
Abstract: KOH/CaO/C supported catalyst was prepared via incipient wetness impregnation and used in synthesis of biodiesel. First, the effects of carrier/active components mass ratio, calcination temperature and calcination time on catalytic activity were investigated aiming at biodiesel yield, and the optimal process conditions for preparation of KOH/CaO/C catalysts were: mass ratio of C/CaO was 4:6; KOH solution (mass concentration) was 25%; impregnation time was 24 h; drying temperature was 105°C and time was 4 h; calcination temperature was 500°C and time was 5 h. Then the complex catalysts prepared under the optimal conditions were applied to synthesize biodiesel, and the effects of dose of catalyst, reaction temperature, and reaction time on the yield of biodiesel were investigated. At last, the optimal process conditions for synthesis of biodiesel were concluded: methanol-oil ratio was 10:1; catalyst dose was 2% of that of soybean oil; reaction temperature was 65°C; reaction time was 5 h. The yield of as-prepared biodiesel could be 98%.
Service Cooperation Incentive Mechanism in a Dual-Channel Supply Chain under Service Differentiation  [PDF]
Qiaoru Yang, Meng Zhang
American Journal of Industrial and Business Management (AJIBM) , 2015, DOI: 10.4236/ajibm.2015.54025
Abstract: The co-principal-anent models of manufacturer and retailer are built under the complete information and asymmetric information. In addition, the optimal profit sharing and the optimal fixed payment ratio are analyzed and compared in both situations. A motivate mechanism about service effort provided by the manufacturer towards the retailer in a dual-channel supply chain is studied. It implies that the profit of manufacturer under asymmetric information decreases dramatically contrasted to complete information and the retailer can gain profits by providing lower services, thus refusing deficiency of the supply chain.
Study on the Planning Strategy of Rural Renewal under the Guidance of Villagers’ Participation in Aba Prefecture  [PDF]
Meng Zhang, Bing Zhao
Open Journal of Social Sciences (JSS) , 2019, DOI: 10.4236/jss.2019.71007
Abstract: Rural revitalization is a policy introduced under the background of the integration of urban and rural development. With the government as the guide, the village-based ruling philosophy promotes rural development. In the development of this policy, the village has been further developed and adapted to the needs of the times. However, there are still a series of problems. The planning mode of the hard-working has made the participation of the villagers mostly in the form, which leads to the lack of support system and limited social development. Therefore, the formulation of villagers’ participation in rural construction is the cornerstone for rural development. In various aspects, the village name was adopted to participate in the rural construction planning strategy, in order to achieve rural renewal and prosperity.
Changes in Plasma Levels of Vasoactive Factors in Patients Undergoing Abdominal Surgery  [PDF]
Jinwen Zhang, Meng Li, Feng Zhang
Surgical Science (SS) , 2014, DOI: 10.4236/ss.2014.59063
Abstract: Background: To investigate the changes in plasma levels of endothelin (ET), nitric oxide (NO), prostacyclin (PGI2) and thromboxane A2 (TXA2) in patients undergoing abdominal operation. Materials and Methods: Thirty cases of abdominal surgery (14 males, 16 females; mean age 48 ± 11 years, ranging from 24 to 70) were prospectively recruited: Twenty-four cases of cholelithiasis and cholecystitis, 2 cases of peptic ulcer and 4 cases of portal vein hypertension. At five different time points (1-3 days after hospitalization (T1), at surgery beginning, after anesthesia (T2) and at the first (T3), third (T4) and fifth day (T5) after surgery), plasma levels of ET-1, NO2-, NO3-6-keto-PGF1α and thromboxane B2 (TXB2), the latter two being stable metabolites of PGI2 and TXA2 respectively, were measured. Results: ET-1 levels increased significantly after anesthesia and surgery (T1 = 69.2 ± 10.7 vs. T2 = 82.4 ± 14.7 vs. T3 = 96.6 ± 22.8 pg/ml, p < 0.05). TXB2 levels before surgery were significantly lower than that after (T2 = 67.5 ± 52.7 vs. T3 = 157.6 ± 21.8 pg/ml, p < 0.05). Pre-surgery NO levels were significantly higher than that after
Design of Miniaturized Band-Pass Filter with Composite Right/Left-Handed Transmission Line  [PDF]
Meng Zhang, Fang Zhang, Xingfang Luo
Journal of Computer and Communications (JCC) , 2015, DOI: 10.4236/jcc.2015.33008
Abstract:

In this paper, a new miniaturized wide-pass-band filter at U band based on composite right/left- handed transmission line (CRLH TL) is implemented. The CRLH TL contributed to a broadband filter is a balanced structure with a small size of only 1.428 mm*0.5530 mm. The frequency characteristics are simulated and the results show that the 3 dB band width of the proposed filter is about 13.5 GHz from 45.8 GHz to 59.3 GHz. The insertion loss is quite flat through the pass-band and the return loss is relatively low.

Optimization Model of Cold-Chain Logistics Network for Fresh Agricultural Products —Taking Guangdong Province as an Example  [PDF]
Kaihao Liang, Wenfeng Zhang, Meng Zhang
Journal of Applied Mathematics and Physics (JAMP) , 2019, DOI: 10.4236/jamp.2019.73034
Abstract: Cold-chain demand of fresh agricultural products is increasing in China, while network layout of cold-chain logistics is in disorder and its cost is huge. To address this problem, this paper casts an optimal model of cold-chain logistics network and tackles it with genetic algorithms. This optimal model takes running total cost of logistics network as the objective, and embeds a nonlinear mixed integer programming including two assignment issues. The model determines optimal layout and logistics management for pre-cooling stations and logistics center for fresh agricultural products. Our main contribution is to consider construction cost and operation cost of cold chain logistics simultaneously. Case study illustrates the effectiveness of the model.
The Fractal and The Recurrence Equations Concerning The Integer Partitions
Meng Zhang
Mathematics , 2013,
Abstract: This paper introduced a way of fractal to solve the problem of taking count of the integer partitions, furthermore, using the method in this paper some recurrence equations concerning the integer partitions can be deduced, including the pentagonal number theorem.
Study on Simulation of Foreshock Activity Properties before Strong Earthquake Using Heterogeneous Cellular Automata Models  [PDF]
Meng Li, Feng Yang, Tao Zhang
International Journal of Geosciences (IJG) , 2014, DOI: 10.4236/ijg.2014.53028
Abstract:

Three different degrees of heterogeneous fault models are simulated by using 2-D random dynamic cellular automata models for analyzing macroscopic behaviors of seismic activity evolution influenced by heterogeneity of fault structures. The results show that the heterogeneities of fault structures can influence evolution properties of the foreshock activity and rupture process, such as the mediate heterogeneous and less heterogeneous structures, which show relatively higher ASR rates and more significant seismic gaps before main shocks. Besides, stress drop distribution ranges of the foreshock events when approaching a main shock show more homogenous (narrower) than that of the foreshock events far from a main shock. So the heterogeneity of fault structures plays an important role in strong earthquake preparation processes.

A Study on the Relationship among Transformational Leadership, Organizational Identification and Voice Behavior  [PDF]
Dongbo Hu, Binbin Zhang, Meng Wang
Journal of Service Science and Management (JSSM) , 2015, DOI: 10.4236/jssm.2015.81017
Abstract: This paper investigates the relationship between transformational leadership and voice behavior under Chinese cultural background. It also examines the mediating effects of organizational identification in the relationship between transformational leadership and voice behavior. We use multiple linear regression analyses to validate our hypotheses. The results of the empirical study showed that: Transformational leadership has a significant positive influence on voice behavior; transformational leadership and its four dimensions have a significant positive influence on organizational identification; organizational identification has a significant positive influence on voice behavior. Organizational identification plays a part intermediary role between transformational leadership and voice behavior.
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