On ``A Note on the Economic Lot Size of the Integrated Vendor-Buyer Inventory System Derived without Derivatives'' by Wee and Chung

[[abstract]]Wee and Chung [3] incorporated the integrated single-vendor single-buyer inventory model with backorder, JIT delivery and inspection cost. They used a simple algebraic approach and proved that the model has an optimal solution for the condition of ˜ C = Hb + Hv“2d p − 1” − “ H2 b b + Hb ” > 0. However, they did not provide the optimal solution to the problem when the restriction is not satisfied. In this note, the authors provide some patch works to enhance the volubility of Wee and Chung’s paper.[[notice]]補正完畢[[journaltype]]國內[[incitationindex]]EI[[incitationindex]]TSSC

Embryonic Growth and Yolk Depletion during Incubation in the Chinese Skink, Plestiodon chinensis

We collected 24 gravid female Chinese skinks (Plestiodon chinensis) to study embryonic growth and yolk depletion during incubation. Females laid eggs between late May and mid-June. Eggs were incubated at 24 (± 0.3) °C. One egg from each clutch was dissected at 5-d intervals starting at laying. Embryonic stages at laying varied from Dufaure and Hubert’s (1961) Stage 30−35, with a mean stage of 32.6. Incubation lengths at 24 °C varied from 35.1 to 48.3 d, with a mean of 41.5 d. Based on the derived functions describing instantaneous changes in embryo dry mass and yolk dry mass, we identified three phases of embryonic growth or yolk depletion in P. chinensis. Phase 1, from Day 0 (at laying) to Day 15 (~36% of the way through incubation), was one of minimal transfer of material from yolk to embryo. Phase 2, from Day 15 to Day 32−33 (~77%−80% of the way through incubation), was characterized by increasingly rapid embryonic growth or yolk depletion. Phase 3, from Day 32−33 to hatching, was characterized by reduced embryonic growth or yolk depletion. The length of the last embryonic stage (Stage 40 = completely differentiated embryos) accounted for about 28% of incubation length, and the dry mass of the smallest embryos of Stage 40 accounted for only ~48% of the hatchling dry mass. Our study adds evidence to the idea that oviposition is not timed to coincide with the onset of rapid embryonic growth in oviparous reptiles, and is first to demonstrate that ~50% embryonic growth occurs in the last quarter of incubation in P. chinensis

Entanglement dynamics of two-qubit system in different types of noisy channels

In this paper, we study entanglement dynamics of a two-qubit extended Werner-like state locally interacting with independent noisy channels, i.e., amplitude damping, phase damping and depolarizing channels. We show that the purity of initial entangled state has direct impacts on the entanglement robustness in each noisy channel. That is, if the initial entangled state is prepared in mixed instead of pure form, the state may exhibit entanglement sudden death (ESD) and/or be decreased for the critical probability at which the entanglement disappear.Comment: 11 pages, 6 figure

Anti-Slosh Baffle Performance In Horizontal Cylindrical Separator Tank

In oil extraction process, baffle is employed in the horizontal cylindrical separator tank to dampen the sloshing dynamics of the fluids mixture. Different baffle configurations affect the efficiency of the separation process and anti-sloshing performance. Simulation of different baffle configurations was conducted using ANSYS Fluent software to explore the baffles performance of gate and porous types. Results from the simulation show that the porous type baffle performs better than the gate type baffle in terms of lower sloshing height and average velocity of fluid mixture across the inspection surface. Parametric study concluded that configuration 9 of porous baffle with 0.4 void fraction and 0.02 m mean particle size produces the best anti-sloshing performance

Divergent Effects of Factors on Crash Severity under Autonomous and Conventional Driving Modes Using a Hierarchical Bayesian Approach

Influencing factors on crash severity involved with autonomous vehicles (AVs) have been paid increasing attention. However, there is a lack of comparative analyses of those factors between AVs and human-driven vehicles. To fill this research gap, the study aims to explore the divergent effects of factors on crash severity under autonomous and conventional (i.e., human-driven) driving modes. This study obtained 180 publicly available autonomous vehicle crash data, and 39 explanatory variables were extracted from three categories, including environment, roads, and vehicles. Then, a hierarchical Bayesian approach was applied to analyze the impacting factors on crash severity (i.e., injury or no injury) under both driving modes with considering unobserved heterogeneities. The results showed that some influencing factors affected both driving modes, but their degrees were different. For example, daily visitors\u27 flowrate had a greater impact on the crash severity under the conventional driving mode. More influencing factors only had significant impacts on one of the driving modes. For example, in the autonomous driving mode, mixed land use increased the severity of crashes, while daytime had the opposite effects. This study could contribute to specifying more appropriate policies to reduce the crash severity of both autonomous and human-driven vehicles especially in mixed traffic conditions

Retailer’s optimal order policy for deteriorating items with ramp type demand under stock-dependent consumption rate

[[abstract]]In this paper, we investigated an inventory model for deteriorating items with a ramp-type demand under stock-dependent consumption rate. The model allows for shortage and complete backlogging of unfilled demand. The purpose of this article is to develop an optimal replenishment policy which maximizes the total profit per unit of time for the retailer. The necessary and sufficient conditions of the existence and uniqueness of the optimal solution are shown. Further, we establish a useful theorem to determine the optimal order quantity and replenishment time. Finally, several numerical examples are provided to illustrate the theoretical results, and sensitivity analysis of major parameters involved in the model is also examined.[[journaltype]]國內[[incitationindex]]EI[[booktype]]紙本[[countrycodes]]TW

Entanglement and quantum phase transition in alternating XY spin chain with next-nearest neighbour interactions

By using the method of density-matrix renormalization-group to solve the different spin-spin correlation functions, the nearest-neighbouring entanglement(NNE) and next-nearest-neighbouring entanglement(NNNE) of one-dimensional alternating Heisenberg XY spin chain is investigated in the presence of alternating nearest neighbour interactions of exchange couplings, external magnetic fields and next-nearest neighbouring interactions. For dimerized ferromagnetic spin chain, NNNE appears only above the critical dimerized interaction, meanwhile, the dimerized interaction effects quantum phase transition point and improves NNNE to a large value. We also study the effect of ferromagnetic or antiferromagnetic next-nearest neighboring (NNN) interactions on the dynamics of NNE and NNNE. The ferromagnetic NNN interaction increases and shrinks NNE below and above critical frustrated interaction respectively, while the antiferromagnetic NNN interaction always decreases NNE. The antiferromagnetic NNN interaction results to a larger value of NNNE in comparison to the case when the NNN interaction is ferromagnetic.Comment: 13 pages, 4 figures,. accepted by Chinese Physics B 2008 11 (in press