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Editorial: Special Section on Reinforcement Learning and Approximate Dynamic Programming  [PDF]
Xin Xu
Journal of Intelligent Learning Systems and Applications (JILSA) , 2010, DOI: 10.4236/jilsa.2010.22008
Abstract: .
Applying the mutation of Bacillus subtilis and the optimization of feather fermentation medium to improve Keratinase activity  [PDF]
Xin Zhang
Advances in Biological Chemistry (ABC) , 2012, DOI: 10.4236/abc.2012.21008
Abstract: Energetic Bacillus subtilis was preliminarily isolated from feather meal selection medium experiment, which could be used to produce Keratinase. Through using the ultraviolet ray produced by ultraviolet light and the compound mutation of sodium nitrite solution, a mutated strain was produced which can yield Kerati-nase with a high activity. The activity of Keratinase was 75.9% higher than that before the compound mutation. This was achieved by optimizing the fermentation medium of mutated strain. The optimum fermentation medium had the parameters as feather meal 5.5%, maize silage 0.8%, K+ 0.018 mol/L, Mg2+ 0.065 mol/L, Ca2+ 0.072 mol/L, Fe2+ 0.010 mol/L, and Na+ 0.088 mol/L. Based on the optimized fermentation medium, the highest yielding rate for producing enzyme was 1.117 U/mL, 25.22% higher than that before the optimization. The amino acid in the fermentation medium fluid reached 22.66 mg/mL. This paper presents a simple, and low cost way to produce high quality bio-fermentation feather meal.
Credit Constraints and Decisions in Exports: Theory under Asymmetric Information  [PDF]
Xin Zhang
Journal of Mathematical Finance (JMF) , 2012, DOI: 10.4236/jmf.2012.23026
Abstract: This paper examines why credit constraints for domestic and exporting firms arise in a setting where banks do not observe firms’ productivities. To maintain incentive-compatibility, banks lend below the amount needed for first-best production. The longer time needed for export shipments induces a tighter credit constraint on exporters than on purely domestic firms, even in the exporters’ home market. Greater risk faced by exporters also affects the credit extended by banks. Extra fixed costs reduce exports on the extensive margin, but can be offset by collateral held by exporting firms.
Undergraduate Curriculum Development for Digital Integrated Circuit Design  [PDF]
Xin Chen
Creative Education (CE) , 2012, DOI: 10.4236/ce.2012.326128
Abstract: This article describes the development of a Digital Integrated Circuit Design curriculum, which includes how to select the design level and how to implement the design. The curriculum is for the undergraduates in grade four, whose major is microelectronics. The development is in the background of very large scale integrated circuits. Since the popular design flow is a hierarchy of abstraction levels, the goal of the curriculum is to develop the students’ ability to design an actual circuit from scratch. Comparison is provided from two aspects. The first aspect is the contents of various published textbooks. The second aspect is the contents of similar courses in famous universities.
Conceptual Metaphor and Vocabulary Teaching in the EFL Context  [PDF]
Xin Fang
Open Journal of Modern Linguistics (OJML) , 2014, DOI: 10.4236/ojml.2014.42030
Abstract: Metaphor, as a matter of thought, a way of cognition, is pervasive in our everyday life and language. As human beings’ important cognitive way, metaphor also serves as one of the important ways for language to develop, including vocabulary. Traditionally, most students memorize vocabulary mechanically with unpleasant results. They don’t realize most words come from metaphorical way, and metaphor is an important process of word meanings expanding and evolution. This paper will give a brief discussion about conceptual metaphor theory and analyze how to apply this theory into vocabulary teaching in the EFL context, in order to help learners to learn vocabulary thoroughly, systematically, and efficiently.
Air Marshal’s Investigation Power’s Research in Dealing with Hijacking Criminals  [PDF]
Xin Zhang
Open Journal of Social Sciences (JSS) , 2015, DOI: 10.4236/jss.2015.33026
Abstract: The power of investigation refers to the country’s investigation organ and investigators in order to achieve the purpose of the investigation: in accordance with legal procedures, using special investigative means to carry out the investigation activities of power. As the youngest police classification in China, Chinese air marshal is the important member that first faces the hijacking suspects, and the effective implementation of its investigation right is crucial on how to identify, investigate and prevent the hijacking behavior. This paper, using empirical analysis, comparative analysis and other research methods, aims to analyze and discuss how to overcome the defects of current Chinese air marshal’s investigation power existing in the hijacking in criminal cases, in order to obtain the earliest direct investigation clue, find the suspect, define the direction and determine the specific target of investigation, and then puts forward the conception and suggestion of some reform.
Oxidative Stress Induced by CuO Nanoparticles (CuO NPs) to Human Hepatocarcinoma (HepG2) Cells  [PDF]
Xin Fu
Journal of Cancer Therapy (JCT) , 2015, DOI: 10.4236/jct.2015.610097
Abstract: The toxicity of CuO nanoparticles (CuO NPs) to human hepatocarcinoma (HepG2) cells was investigated in this study. CuO NPs (1 - 40 mg/L) had significant toxicity to HepG2 cells. The antioxidant N-acetyl-L-cysteine (NAC) significantly reduces the cytotoxicity induced by the CuO NPs, supporting the hypothesis that oxidative stress contributes to the cytotoxicity of CuO NPs. To further explore the oxidative mechanisms of cytotoxicity, we examined CuO NPs-induced production of reactive oxygen species (ROS) in HepG2 cells. CuO NPs generated intracellular ROS in HepG2 cells in a concentration-dependent manner.
Staff Psychological Contract Innovates Human Resource Management  [PDF]
Xiaoyan LIU, Xin WEI
iBusiness (IB) , 2009, DOI: 10.4236/ib.2009.11005
Abstract: This paper mainly studies on the relationships between the contents of staff psychological contract, job satisfaction level and occupation satisfaction level by surveying, combining research methods of literature, academic and empirical research. The research results have important reference value on human resource management innovation. New suggestions were also put forward, which are relative with recruitment, measure of psychological contract, culture construction and targeted incentives to staff of different attributes.
A Fixed-Phase Quantum Search Algorithm with More Flexible Behavior  [PDF]
Xin Li, Panchi Li
Journal of Quantum Information Science (JQIS) , 2012, DOI: 10.4236/jqis.2012.22006
Abstract: When the Grover’s algorithm is applied to search an unordered database, the probability of success usually decreases with the increase of marked items. To address this phenomenon, a fixed-phase quantum search algorithm with more flexible behavior is proposed. In proposed algorithm, the phase shifts can be fixed at the different values to meet the needs of different practical problems. If research requires a relatively rapid speed, the value of the phase shifts should be appropriately increased, if search requires a higher success probability, the value of the phase shifts should be appropriately decreased. When the phase shifts are fixed at , the success probability of at least 99.38% can be obtained in iterations.
Effect of pyk gene location on constructing dATP conversion E. coli strain  [PDF]
Xiujuan Xin, Jie Bao
Advances in Bioscience and Biotechnology (ABB) , 2013, DOI: 10.4236/abb.2013.41011
Abstract: A dATP conversion E. coli strain could be constructed when both pyk and adk1 gene were expressed successfully. pyk gene encodes pyruvate kinase (PK) could be expressed, when inserted it before adk1 gene which encodes adenylate kinase (AK) in plasmid pET-pyk-adk1 after transform into E. coli and the recombinant could be used to convert dATP from dAMP. Another plasmid pET-adk1-pyk, which inserted pyk gene behind of adk1, the recombinant E. coli transformed with this plasmid could not convert dAMP into dATP, pyk gene cannot be translated in this recombinant. The different translation levels of
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