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Abstract

False jagged-chickweed ( Lepyrodiclis holosteoides (C.A. Mey.) Fenzl ex Fisch. & C.A. Mey.) is an invasive weed species distributed in many regions of Iran. Scientific knowledge about the biology and ecology of false jagged-chickweed is rare. In a series of laboratory experiments, the effect of chilling treatments, potassium nitrate (KNO3), gibberellic acid (GA3), concentrations, temperature regimes, and sowing depths on seed germination and breaking seed dormancy of false jagged-chickweed was studied. In two field experiments the phenology of false jagged-chickweed and winter wheat ( Triticum aestivum) was also compared. Chilling treatment for 15 days, a KNO3 concentration of 30 μmolar and a GA3 concentration of 144 μmolar increased germination percentage and germination rate. However, chilling treatment for 15 days did not increase germination rate as well as the KNO3 and GA3 treatments. A quadratic polynomial model predicted that the optimum temperature giving the maximum germination percentage was 22°C. Seedlings emerged in a range of sowing depths from 0 to 8 cm, while no seedling emergence occurred at sowing depths greater than 10 cm. Based on a Gaussian model, the optimum sowing depth was predicted to be 3.9 cm. False jagged-chickweed required higher growing degree days (GDD) for seedling emergence than winter wheat, while the flowering stage of false jagged-chickweed occurred earlier than winter wheat. Results achieved in the present study are of interest not only for studying other life cycle aspects of this species but also as basic information for developing management strategies.
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Authors and Affiliations

Mehdi Minbashi Moeini
1
Eshagh Keshtkar
2
Hamidreza Sasanfar
1
Mohammad Ali Baghestani
1

  1. Iranian Research Institute of Plant Protection, Agricultural Research, Education and Extension Organization (AREEO), Tehran, Iran
  2. Department of Agronomy, Faculty of Agriculture, Tarbiat Modares University, Tehran, Iran
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Abstract

Tunnel lay-by spacing is directly related to traffic safety and engineering investment. Nevertheless, its mechanism is not clear, and the rationality of the exiting norms with respect to tunnel lay-by spacing needs to demonstrate. A calculation model for tunnel lay-by spacing was derived by considering the headway and the physical kinematics of the two vehicles chasing and encountering. With it, the influence of various parameters on lay-by spacing were analysed and the rationality of the model were discussed through comparing with existing norms. Results shows longitudinal gradient rate, daily average traffic flow, rolling resistance coefficient, posted speed limit are significant to determine the lay-by spacing, and the most important parameter is longitudinal gradient rate. Existing tunnel lay-by spacing norm values are not reasonable enough, either too strict or too loose. These findings provide scientific support for how to select tunnel lay-by spacing value, which can improve tunnel traffic safety and make engineering investment reasonable.
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Authors and Affiliations

Bo Liang
1
ORCID: ORCID
Yao Xiao
2
ORCID: ORCID

  1. Chongqing Jiaotong University, School of Civil Engineering, State Key Laboratory of Mountain Bridge and Tunnel Engineering, Xuefu Avenue 66, Nanan District, Chongqing, China
  2. Chongqing Jiaotong University, School of Civil Engineering, Chongqing Rail Transit (Group) Co., Ltd, Xuefu Avenue 66, Nanan District, Chongqing, China
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Abstract

The article presents measurement methods serving to determine electric and magnetic properties of rails (60E1) used to construct railroad turnouts. Knowledge of a rail's electric and magnetic properties is necessary to analyse the phenomena in the rail's internal structure when under impact of a powerful electromagnetic field. The electric and magnetic properties will also help to develop a simulation model of Turnhout induction heating in 2D and 3D space.

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Authors and Affiliations

Kamil Kiraga
Elżbieta Szychta
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Abstract

In this paper, the basic cutting characteristics such as cutting forces, cutting power and its distribution, specific cutting energies were determined taking into account variable tool corner radius ranging from 400 to 1200 μm and constant cutting parameters typical for hard turning of a hardened 41Cr4 alloy steel of 55 ± 1 HRC hardness. Finish turning operations were performed using chamfered CBN tools. Moreover, selected roughness profiles produced for different tool corner radius were compared and appropriate surface roughness parameters were measured. The measured values of Ra and Rz roughness parameters are compared with their theoretical values and relevant material distribution curves and bearing parameters are presented.

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Bibliography

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Authors and Affiliations

Krzysztof Żak
1

  1. Faculty of Mechanical Engineering, Opole University of Technology, Poland

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