480 research outputs found
Solving Vehicle Routing Problem in the Logistics Distribution Based on Immune Genetic Algorithm
In logistic transport industry, individual demands and diversity requirements are matters in transport operation; this paper focused on solving vehicle routing problem (VRP) by using the immune genetic algorithm (IGA). In this algorithm, firstly, establish the mathematical model of VRP. Secondly, design the IGA of which use natural number coding method to encode antibodies; apply R continuous method to calculate the affinity between antibodies; use the roulette wheel selection method to select good individuals; adopt partial matching method to improve the crossover operation; use simple inversion mutation method for mutation operation. Finally, example analysis proves that using the IGA can find out the optimal path quickly and efficiently
Ecological Civilization Construction is the Fundamental Way to Develop Low-carbon Economy
AbstractThis article gives a brief account of the meaning, characteristics and origin of ecological civilization, an analysis of the positive impacts of ecological civilization construction on low-carbon economy, and proposes specific recommendations for constructing ecological civilization to develop low-carbon economy in China: compile āPlanning Outlineā and āImplementation Planā, increase the publicity of education on ecological civilization concept, strengthen discussion on ecological civilization problems, establish government-enterprise cooperative platform, supporting systems of green technology and financial services to support ecological civilization construction, incorporate ecological civilization indicator into the performance evaluation of government departments, strengthen ecological civilization legislation.Ā© 2011 Published by Elsevier Ltd. Selection and peer-review under responsibility of RIUD
The Hardy-Littlewood Maximal Operator on Discrete Weighted Morrey Spaces
In this paper, we introduce a discrete version of weighted Morrey spaces, and
discuss the inclusion relations of these spaces. In addition, we obtain the
boundedness of discrete weighted Hardy-Littlewood maximal operators on discrete
weighted Lebesgue spaces by establishing a discrete Calder\'on-Zygmund
decomposition for weighted -sequences. Furthermore, the boundedness of
discrete Hardy-Littlewood maximal operators on discrete weighted Morrey spaces
is established
Stage effects of negative emotion on spatial and verbal working memory
Background: The effects of negative emotion on different processing periods in spatial and verbal working memory (WM) and the possible brain mechanism of the interaction between negative emotion and WM were explored using a high-time resolution event-related potential (ERP) technique and time-locked delayed matching-to-sample task (DMST)
Allelic Share among Two Taxonomically Related \u3cem\u3eElymus\u3c/em\u3e Species, Hexaploidy \u3cem\u3eE. nutans\u3c/em\u3e Griseb and Tetraploid \u3cem\u3eE. burchanābuddae\u3c/em\u3e (Nevski) Tzvelev
Anticipation of Uncertain Threat Modulates Subsequent Affective Responses and Covariation Bias
Uncertainty contributes to stress and anxiety-like behaviors by impairing the ability of participants to objectively estimate threat. Our study used the cue-picture paradigm in conjunction with the event-related potential (ERP) technique to explore the temporal dynamics of anticipation for and response to uncertain threat in healthy individuals. This task used two types of cue. While ācertainā cues precisely forecasted the valence of the subsequent pictures (negative or neutral), the valence of pictures following āuncertainā cues was not predictable. ERP data showed that, during anticipation, uncertain cues elicited similar Stimulus-Preceding Negativity (SPN) to certain-negative cues, while both of them elicited larger SPN than certain-neutral cues. During affective processing, uncertainty enlarged the mean amplitude of late positive potential (LPP) for both negative and neutral pictures. Behavioral data showed that participants reported more negative mood ratings of uncertain-neutral pictures relative to certain-neutral pictures and overestimated the probability of negative pictures following uncertain cues. Importantly, the enlarged anticipatory activity evoked by uncertain cues relative to that evoked by certain-neutral cues positively modulated the more negative mood ratings of uncertain-neutral pictures relative to certain-neutral pictures. Further, this more negative mood ratings and the general arousal anticipation during anticipatory stage contributed to the covariation bias. These results can provide a novel insight into understanding the neural mechanism and pathological basis of anxiety
Edge-Mediated Skyrmion Chain and Its Collective Dynamics in a Confined Geometry
The emergence of a topologically nontrivial vortex-like magnetic structure,
the magnetic skyrmion, has launched new concepts for memory devices. There,
extensive studies have theoretically demonstrated the ability to encode
information bits by using a chain of skyrmions in one-dimensional nanostripes.
Here, we report the first experimental observation of the skyrmion chain in
FeGe nanostripes by using high resolution Lorentz transmission electron
microscopy. Under an applied field normal to the nanostripes plane, we observe
that the helical ground states with distorted edge spins would evolves into
individual skyrmions, which assemble in the form of chain at low field and move
collectively into the center of nanostripes at elevated field. Such skyrmion
chain survives even as the width of nanostripe is much larger than the single
skyrmion size. These discovery demonstrates new way of skyrmion formation
through the edge effect, and might, in the long term, shed light on the
applications.Comment: 7 pages, 3 figure
Total Replacement of Dietary Fish Oil with a Blend of Vegetable Oils in the Marine Herbivorous Teleost, Siganus canaliculatus
To investigate the feasibility of total replacement of dietary fish oil with vegetable oils (VO) and the optimal dietary polyunsaturated fatty acid (PUFA) level in the marine herbivorous teleost Siganus canaliculatus, six isonitrogenous (32 %) and isolipidic (8 %) diets were formulated. Control diet (FO) used fish oil as lipid source, whereas diets VO1-VO5 contained various blends of palm, soybean, rapeseed and linseed oils, in which the dietary PUFA levels were 42.0 %, 38.2 %, 33.8 %, 29.9 % and 27.1 %, respectively. After S. canaliculatus juveniles were fed with the diets for 9 weeks, their growth performance exhibited no significant difference among the dietary groups. The tissue fatty acid profiles in liver and fillet generally reflected the dietary fatty acid compositions, and showed no significant difference among the VO dietary groups. The results suggested that dietary fish oil can be replaced completely by VO without affecting their growth performance. Concerning the effects of the dietary FA profile on the survival rate, HSI and VSI, and PUFA composition in fillets, diets VO1 and VO2 were more favorable compared with diets VO3āVO5. Considering the availability and cost of the VOs, diet VO2 was recommended for practical use in S. canaliculatus
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