15 results on '"Zhang, Ji-qiang"'
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2. Characteristics of transient production rate performance of horizontal well in fractured tight gas reservoirs with stress-sensitivity effect
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Li, Xiao-Ping, Cao, Li-Na, Luo, Cheng, Zhang, Bo, Zhang, Ji-Qiang, and Tan, Xiao-Hua
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- 2017
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3. Horizontal well transient rate decline analysis in low permeability gas reservoirs employing an orthogonal transformation method
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Cao, Li-Na, Li, Xiao-Ping, Luo, Cheng, Yuan, Lin, Zhang, Ji-Qiang, and Tan, Xiao-Hua
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- 2016
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4. Composition and microstructure of beryllium carbide films prepared by thermal MOCVD
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He, Yu-dan, Luo, Jiang-shan, Li, Jia, Meng, Ling-biao, Luo, Bing-chi, Zhang, Ji-qiang, Zeng, Yong, and Wu, Wei-dong
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- 2016
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5. Influence of substrate temperature on the growth and electrical properties of thermally evaporated Be films
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Li, Kai, Luo, Bing-chi, Zhang, Ji-qiang, Li, Jia, Wu, Wei-dong, and Liu, Ying
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- 2015
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6. Emergence of anti-coordinated patterns in snowdrift game by reinforcement learning.
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Ding, Zhen-Wei, Zhang, Ji-Qiang, Zheng, Guo-Zhong, Cai, Wei-Ran, Cai, Chao-Ran, Chen, Li, and Wang, Xu-Ming
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EDUCATIONAL games , *PERTURBATION theory , *COLLECTIVE behavior , *SOCIAL systems , *STABILITY theory - Abstract
Patterns emerging through self-organization in nature have sparked considerable interest across various disciplines, owing to their significance in comprehending collective behaviors. The anti-coordination phenomenon is widespread in both social systems and ecosystems. However, within the context of the SnowDrift Game (SDG), considered as a typical anti-coordination game, the occurrence of anti-coordination patterns is surprisingly rare. In this work, we introduce a model called the Two-Agent, Two-Action Reinforcement Learning Evolutionary Game (2 × 2 RLEG), and utilize it in the SDG on different regular lattices. We unveil intriguing phenomena represented by Anti-Coordinated domains (AC-domains) within spatial patterns, which hold a significant sway over the cooperation preference within populations. The frustration contributes substantially to the diversity of AC-domains within parameter space. To comprehend the underlying mechanism, we have developed a perturbation theory to analyze the stability of different AC-domains comprising action patterns and identify continuous phase transitions within parameter space. Our theory effectively partitions the parameter space into several areas, each characterized by unique features of domains that determine the cooperation preferences within the population. Our work offers insights into the emergence of spatial patterns and their impact on cooperation in nature, contributing to the development of theories that analyze their structural complexities. • Anti-coordinated patterns naturally emerge in snowdrift game by reinforcement learning. • A perturbation theory is successfully developed. • The effect of memory and frustration greatly influence these patterns and collective preferences. [ABSTRACT FROM AUTHOR]
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- 2024
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7. Directed transport of two-coupled particles under the coordination of the coupling and an asymmetric potential.
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Zhang, Peng-Juan, Zhang, Ji-Qiang, Wang, Peng, Huo, Jie, and Wang, Xu-Ming
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PSEUDOPOTENTIAL method , *RANDOM noise theory , *WHITE noise - Abstract
Directed transport of particles in asymmetric potential fields is an important topic in many scenarios. This article proposes a model to describe the transport of an overdamped system that is composed of two-coupled particles confined by a saw-tooth potential under the Gaussian white noise and driven by a rocking force. The transport of the two-coupled particles exhibits some interesting behaviors, such as the current varies non-monotonically/increase first and then decrease with the coupling strength, there are two inversion points of the transport direction as the free length between the two particles varies, etc. The effective potential defined by adding the asymmetric potential and the coupling between two particles can clearly interpret, based on its overall inclination, the generation of the directed transport in the model. And the direction of movement can be reversed by adjusting the strength of the rocking force and noise under certain ratchet potential. The findings and analysis method allow us to regulate the directed transport of coupled particles via adjusting the combination of the aforementioned factors. • The effective potential is defined by adding the potential and the coupling effect. • The overall tilt of the effective potential is strongly depends on the coupling. • The tilt of the effective potential can interpret the origin of directed transport. • There are two inversion points of the transport direction as the free length varies. • Certain noise intensity and/or rocking force can lead to the current reversal. [ABSTRACT FROM AUTHOR]
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- 2024
- Full Text
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8. Immunolocalization of estrogen receptor beta in the hypothalamic paraventricular nucleus of female mice during pregnancy, lactation and postnatal development
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Zhang, Ji-Qiang, Su, Bing-yin, and Cai, Wen-Qin
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ESTROGEN , *PREGNANCY , *HYPOTHALAMIC hormones , *LABORATORY mice - Abstract
Previous studies have shown that estrogen receptor beta (ERbeta) is the predominant estrogen receptor in the hypothalamic paraventricular nucleus (PVN) of mouse, mediating estrogen regulation of the neuroendocrine activities of the PVN, but the exact roles that ERbeta plays in the PVN remain unclear. In this study, we used immunocytochemistry to investigate the expression of ERbeta in the maternal PVN of mice during pregnancy (pregnant days 8, 10, 12, 15 and 18), lactation (postpartum days 1, 4 and 8) as well as in the PVN of the females from postnatal days 1, 3, 5, 7, 9, 15, 30 and 70. We found out that ERbeta was predominantly localized in the magnocellular divisions of PVN. In the pregnant female brain, generally, the ERbeta was lower than that of the postnatal development, the lowest level was found at gestational days 10–12; then from gestational day 18 to postpartum day 1, it increased to higher levels, followed by a decrease from postpartum day 4. During the postnatal development, the highest level of ERbeta was found at early postnatal days (before postnatal day 15), thereafter, it decreased to a lower level. The above results indicate that circulating sex steroids may differentially regulate the expression of ERbeta in the PVN of mice. It also suggests that this receptor may play important roles in the regulation of parturition and in the development, food intake and body weight increases of the newborns by acting on the neuropeptides, which were also detected in the PVN. [Copyright &y& Elsevier]
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- 2004
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9. Distribution and differences of estrogen receptor beta immunoreactivity in the brain of adult male and female rats
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Zhang, Ji-Qiang, Cai, Wen-Qin, Zhou, De-Shan, and Su, Bing-Yin
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ESTROGEN receptors , *NEURODEGENERATION - Abstract
Studies have shown that estrogen plays important roles in regulating neural structure and function in the brain, but the mechanism remains unclear. The actions of estrogen were thought to be mediated by a single estrogen receptor until the identification of another estrogen receptor, namely estrogen receptor-β (ER-β). Here we report a comprehensive study of the localization of ER-β immunoreactivity and differences in the brains of adult male and female rats on the basis of a nickel ammonium sulfate-enhanced immunocytochemical method using a polyclonal antiserum sc-8974. The results of these studies revealed: (1) ER-β immunoactive material was mainly localized in the neuronal nucleus, but it was also detectable in the cytoplasm and neuronal processes; (2) in both male and female rats, high levels of ER-β immunopositive signals were detected in the anterior olfactory nucleus, cerebral cortex, Purkinje cells, vertical limb of the diagonal band, red nucleus, locus ceruleus, and motor trigeminal nucleus. Moderate levels were found in the medial septum, lateral amygdaloid nucleus, substantia nigra, and central gray. Weak signals were localized in other subregions of the hypothalamus and amygdaloid complex; (3) there was an obvious difference of ER-β immunoreactivity between male and female rats, and its intracellular distribution also showed a sex difference. The above results provide the first detailed evidence that ER-β protein is widely distributed in both male and female rat brains, but that distinctive sex differences also exist. Estrogen may exert its function in different brain regions in a gender-specific manner. [Copyright &y& Elsevier]
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- 2002
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10. The universality of physical images at relative timescales on multiplex networks.
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Chang, Xin, Cai, Chao-Ran, Zhang, Ji-Qiang, and Yang, Wen-Li
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MULTIPLEXING , *FACTOR analysis , *RESEARCH personnel , *COEVOLUTION , *TOTAL shoulder replacement - Abstract
The duration of the accumulation rate (physical image) is a key factor in analysis of counterintuitive phenomena involving relative timescales on multiplex networks. Typically, the relative timescales are represented by multiplying any layer by the same factor. However, researchers often overlook the changes in the relative timescales caused by local parameters, resulting in incomplete analysis of phenomena. This paper examines the survival time of stifler individuals in the information-epidemic model on multiplex networks. The relative timescales can be affected by the survival time (only one parameter), reversing the monotonically increasing phenomenon into a monotonically decreasing one, that is, a counterintuitive phenomenon under incomplete analysis. Additionally, the relative timescales can influence the epidemic threshold, which is different from the previous studies. Our work suggests that considering the physical image of relative timescales is crucial when analyzing multiplex networks, even when only one parameter is altered. • Relative timescales are essential for coevolutionary dynamics on multiplex networks. • Changing just one parameter can significantly change the relative timescales. • Epidemic threshold in information-epidemic model is affected by relative timescales. • Reducing the survival time of stifler individuals is a "double-edged sword". [ABSTRACT FROM AUTHOR]
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- 2024
- Full Text
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11. Emergence of cooperation in two-agent repeated games with reinforcement learning.
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Ding, Zhen-Wei, Zheng, Guo-Zhong, Cai, Chao-Ran, Cai, Wei-Ran, Chen, Li, Zhang, Ji-Qiang, and Wang, Xu-Ming
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REINFORCEMENT learning , *EDUCATIONAL games , *COOPERATION - Abstract
Cooperation is the foundation of ecosystems and the human society, and the reinforcement learning provides crucial insight into the mechanism for its emergence. However, most previous work has mostly focused on the self-organization at the population level, the fundamental dynamics at the individual level remains unclear. Here, we investigate the evolution of cooperation in a two-agent system, where each agent pursues optimal policies according to the classical Q-learning algorithm in playing the strict prisoner's dilemma. We reveal that a strong memory and long-sighted expectation yield the emergence of Coordinated Optimal Policies (COPs), where both agents act like "Win-Stay, Lose-Shift" (WSLS) to maintain a high level of cooperation. Otherwise, players become tolerant toward their co-player's defection and the cooperation loses stability in the end where the policy "all Defection" (All-D) prevails. This suggests that tolerance could be a good precursor to a crisis in cooperation. Furthermore, our analysis shows that the Coordinated Optimal Modes (COMs) for different COPs gradually lose stability as memory weakens and expectation for the future decreases, where agents fail to predict co-player's action in games and defection dominates. As a result, we give the constraint to expectations of future and memory strength for maintaining cooperation. In contrast to the previous work, the impact of exploration on cooperation is found not be consistent, but depends on composition of COMs. By clarifying these fundamental issues in this two-player system, we hope that our work could be helpful for understanding the emergence and stability of cooperation in more complex scenarios in reality. • Strong memory and long-sighted expectations yield "win-stay, lose-shift" and high cooperation. • Tolerance of exploitation could be a good precursor to a crisis in cooperation. • The impact of exploration on cooperation nonmonotonically depends on the composition of the coordinated optimal modes. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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12. Effect of magnetic field on the growth of Be films prepared by thermal evaporation.
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Li, Kai, Luo, Bing-chi, Tan, Xiu-lan, Zhang, Ji-qiang, Wu, Wei-dong, and Liu, Ying
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BERYLLIUM , *METALLIC films , *MAGNETIC fields , *EVAPORATION (Chemistry) , *GRAIN refinement , *INERTIAL confinement fusion , *SURFACE roughness - Abstract
Grain refinement of beryllium deposits is studied as a significant subject for beryllium capsule in the Inertial Confinement Fusion project. The Be films were prepared on the Si (1 0 0) substrates by thermal evaporation with and without a magnetic field, respectively. The two separate groups of prepared Be films were characterized. The results showed the grain diameter in the Be film transited from 300 nm to 18 nm and the surface roughness of the Be film decreased from 61 nm to 3 nm by application of the magnetic field during the deposition process of Be coating. However, the Be film grown with the magnetic field was easily oxidized in comparison with that grown without magnetic field due to the refined grains, and the oxidation was gradually decreased with the increase of etching depth in the Be film. The reason for grain refinement of Be film was also qualitatively described. [ABSTRACT FROM AUTHOR]
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- 2014
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13. The structure, density and settlability of anammox granular sludge in high-rate reactors
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Lu, Hui-feng, Zheng, Ping, Ji, Qi-xing, Zhang, Hong-tao, Ji, Jun-yuan, Wang, Lan, Ding, Shuang, Chen, Ting-ting, Zhang, Ji-qiang, Tang, Chong-jian, and Chen, Jian-wei
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MOLECULAR structure , *SEWAGE sludge , *MICROSCOPY , *ANAEROBIC reactors , *BIOMASS energy , *NITROGEN , *MICROBIAL cells - Abstract
Abstract: Microscopic observation and settling test were carried out to investigate the structure, density and settlability of anammox granules taken from a high-rate upflow anaerobic sludge blanket (UASB) reactor. The results showed that the anammox granules were irregular in shape and uneven on surface, and their structure included granule, subunit, microbial cell cluster and single cell. The gas pockets were often observed in the anammox granules, and they originated from the obstruction of gas tunnel by extracellular polymer substances (EPSs) and the inflation of produced dinitrogen gas. The volume of gas pockets became larger with the increasing diameter of anammox granules, which led to the decreasing density and the floatation of anammox granules. The diameter of anammox granules should be controlled at less than 2.20mm to avoid the granule floatation. A hypothesized mechanism for the granulation and floatation of anammox biomass was proposed. [Copyright &y& Elsevier]
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- 2012
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14. Enhanced nitrogen removal from pharmaceutical wastewater using SBA-ANAMMOX process
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Tang, Chong-Jian, Zheng, Ping, Chen, Ting-Ting, Zhang, Ji-Qiang, Mahmood, Qaisar, Ding, Shuang, Chen, Xiao-Guang, Chen, Jian-Wei, and Wu, Da-Tian
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NITROGEN removal (Sewage purification) , *LUMINESCENCE , *AMMONIUM , *OXIDATION , *TOXICITY testing , *PHOTOBACTERIUM phosphoreum , *PHARMACEUTICAL industry , *POLLUTANTS - Abstract
Abstract: Efficient biological nitrogen removal from pharmaceutical wastewater has been focused recently. The present study dealt with the treatment of colistin sulfate and kitasamycin manufacturing wastewater through anaerobic ammonium oxidation (ANAMMOX). The biotoxicity assay on luminescent bacterium Photobacterium phosphoreum (T3 mutation) showed that the pharmaceutical wastewater imparted severe toxicity with a relative luminosity of 3.46% ± 0.45%. During long-term operation, the cumulative toxicity from toxic pollutants in wastewater resulted in the performance collapse of conventional ANAMMOX process. A novel ANAMMOX process with sequential biocatalyst (ANAMMOX granules) addition (SBA-ANAMMOX process) was developed by combining high-rate ANAMMOX reactor with sequential biocatalyst addition (SBA). At biocatalyst addition rate of 0.025 g VSS (L wastewater)−1 day−1, the nitrogen removal rate of the process reached up to 9.4 kg N m−3 day−1 in pharmaceutical wastewater treatment. The effluent ammonium concentration was lower than 50 mg N L−1, which met the Discharge Standard of Water Pollutants for Pharmaceutical Industry in China (GB 21903-2008). The application of SBA-ANAMMOX process in refractory ammonium-rich wastewater is promising. [ABSTRACT FROM AUTHOR]
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- 2011
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15. Performance of high-loaded ANAMMOX UASB reactors containing granular sludge
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Tang, Chong-Jian, Zheng, Ping, Wang, Cai-Hua, Mahmood, Qaisar, Zhang, Ji-Qiang, Chen, Xiao-Guang, Zhang, Lei, and Chen, Jian-Wei
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PERFORMANCE evaluation , *NITROGEN removal (Sewage purification) , *UPFLOW anaerobic sludge blanket reactors , *AMMONIUM , *OXIDATION , *HYDRAULICS , *BIOMASS , *POLYSACCHARIDES , *GRANULAR materials - Abstract
Abstract: The performance of high-loaded anaerobic ammonium oxidizing (ANAMMOX) upflow anaerobic sludge bed (UASB) reactors was investigated. Two ANAMMOX reactors (R1 with and R2 without effluent recycling, respectively) were fed with relatively low nitrite concentration of 240 mg-N L−1 with subsequent progressive increase in the nitrogen loading rate (NLR) by shortening the hydraulic retention time (HRT) till the end of the experiment. A super high-rate performance with nitrogen removal rate (NRR) of 74.3–76.7 kg-N m−3 day−1 was accomplished in the lab-scale ANAMMOX UASB reactors, which was 3 times of the highest reported value. The biomass concentrations in the reactors were as high as 42.0–57.7 g-VSS L−1 with the specific ANAMMOX activity (SAA) approaching to 5.6 kg-N kg-VSS−1 day−1. The high SAA and high biomass concentration were regarded as the key factors for the super high-rate performance. ANAMMOX granules were observed in the reactors with settling velocities of 73–88 m h−1. The ANAMMOX granules were found to contain a plenty of extracellular polymers (ECPs) such as 71.8–112.1 mg g-VSS−1 of polysaccharides (PS) and 164.4–298.2 mg g-VSS−1 of proteins (PN). High content of hemachrome (6.8–10.3 μmol g-VSS−1) was detected in the ANAMMOX granules, which is supposed to be attributed to their unique carmine color. [ABSTRACT FROM AUTHOR]
- Published
- 2011
- Full Text
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