14 research outputs found
Figure 2 in A population growth model of Tetranychus urticae Koch (Acari: Tetranychidae)
No full textFigure 2. Growth of total population of T. urticae on two bean fitted to logistic curve.Published as part of Farazmand, Azadeh & Amir-Maafi, Masood, 2018, A population growth model of Tetranychus urticae Koch (Acari: Tetranychidae), pp. 193-201 in Persian Journal of Acarology 7 (2) on page 196, DOI: 10.22073/pja.v7i2.36245, http://zenodo.org/record/717374
Figure 2 in Age-specific functional response and predation capacity of Phytoseiulus persimilis (Phytoseiidae) on the two-spotted spider mite
No full textFigure 2 Quadratic regression curve betweenPhytoseiulus persimilis age and handling time on eggs of Tetranychus urticaePublished as part of Fathipour, Yaghoub, Karimi, Maryam, Farazmand, Azadeh & Talebi, Ali Asghar, 2018, Age-specific functional response and predation capacity of Phytoseiulus persimilis (Phytoseiidae) on the two-spotted spider mite, pp. 31-40 in Acarologia 58 (1) on page 37, DOI: 10.24349/acarologia/20184225, http://zenodo.org/record/450229
Age-specific functional response and predation capacity of Phytoseiulus persimilis (Phytoseiidae) on the two-spotted spider mite
No full textFathipour, Yaghoub, Karimi, Maryam, Farazmand, Azadeh, Talebi, Ali Asghar (2018): Age-specific functional response and predation capacity of Phytoseiulus persimilis (Phytoseiidae) on the two-spotted spider mite. Acarologia 58 (1): 31-40, DOI: 10.24349/acarologia/20184225, URL: http://dx.doi.org/10.24349/acarologia/2018422
A Framework For Coping With Intra-Node Adjacent Channel Interference In Multi- Channel Multi-Radio Mesh Networks
No full textTypically, in a wireless data network, all devices use the same channel (i.e. the same frequency) so that they can easily communicate with each other. However, as node density increases, the throughput share of each device decreases due to contention of the wireless medium. It seems that the capacity problem in wireless mesh networks can be alleviated by equipping the nodes with multiple radios tuned to non-overlapping channels. In theory it should be possible to have simultaneous reliable transmissions on orthogonal non-overlapping channels. In practice though, due to signal leakage from one channel to another, transmissions on these non overlapping channels interfere with one another. In this thesis, I claim that the assumption of perfect independence between non-overlapping operating channels does not always hold in general. During this work, I have done some practical measurements about adjacent channel interference, taking into consideration various factors such as antenna separation, number of channels and radio, transmit-power and packet size. I have compared the interference effects in different channels. Furthermore, I have evaluated and studied the causes and effects of adjacent channel interference via analysis, calculations and simulation. In order to cope with this problem, a classification of possible solutions which are feasible is discussed, and then by adopting the concept of reservation, I propose a solution called MRR (Multi-Radio Reservation). Finally the proposed solution is evaluated.Electrical Engineering, Mathematics and Computer Scienc
Politics: Basic Concepts
No full textThis is the final version as it appears for the citation:
Jordan, Soren. 2016. "Politics: Basic Concepts." In Global Encyclopedia of Public Adminis- tration, Public Policy, and Governance, ed. Ali Farazmand. Springer.
DOI: 10.1007/978-3-319-31816-5_1403-1
The page numbers here are consistent with the published version. Corresponding author: Soren Jordan ([email protected])
<p><strong>Spatial distribution and sampling plan for <em>Tetranychus urticae</em> (Acari: Tetranychidae) in bean crops</strong></p>
No full textThe two-spotted spider mite, Tetranychus urticae Koch, is one of the most destructive bean pests in the central part of Iran. Spider mites feeding on bean leaves cause physiological changes in the plant, which coupled with favorable environmental conditions can lead to increased mite infestations. Significant yield loss can occur in the absence of pest monitoring and timely management. Monitoring for its occurrence and the population density is usually done by visual inspection and consequently demands much effort and time. Hence the objectives of this study were 1) to describe the sampling distribution pattern of this mite and 2) to develop a fixed-precision sequential sampling plan for density estimation. Population estimates were made by registering the number of all stages on 150 leaves of bean plants from mid to the end of July of 2021. Taylor's power law (TPL) was used to analyze the spatial distribution of the pest (r2 = 0.849). Aggregation Indexes (b = 1.239) were significantly greater than one, indicating the aggregation of T. urticae. We used TPL parameters to develop a sequential sampling plan at precision levels of 0.10 and 0.25 using Green's method. Fixed-precision sequential sampling plan could represent a suitable method for sampling T. urticae population in bean fields in the Varamin area, with the practical advantage of lower cost and time consumption than standard sampling plans. The use of this plan outside the Varamin area can be applicable. In conclusion, the sequential sampling plans determined in this study for mites can be incorporated into integrated pest management programs in bean crops by making precise and quick decisions
Sustainable Location Selection of Data Centers: Developing a Multi-Criteria Set-Covering Decision-Making Methodology
No full textIn this paper, a multi-criteria set-covering methodology is proposed to select suitable locations for a set of data centers. First, a framework of criteria, with social, economic and environmental dimensions, is presented. The framework is used to calculate the suitability of potential data center locations in Iran. To that end, a sample of specialists in Iran was asked to take part in an online questionnaire, based on best-worst method (BWM), to determine the weight of the criteria included in the proposed framework, after which a number of potential locations are evaluated on the basis of the criteria. The proposed model is evaluated under a number of settings. Using the proposed multi-criteria set-covering model, not only the utility of candidate places is evaluated by sustainability criteria but also all service applicants are covered by at least one data center with a specific coverage radius.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Transport and Logistic
<p><strong>Host-dependent functional response of <em>Typhlodromus bagdasarjani</em> (Acari: Phytoseiidae) feeding on <em>Tetranychus urticae</em> (Acari: Tetranychidae)</strong></p>
No full textTyphlodromus (Anthoseius) bagdasarjani Wainstein & Arutunjan is an indigenous species naturally inhabiting mulberry and fig trees in urban regions. The current study was conducted to evaluate possible effects of four host plants including cucumber, tomato, eggplant, and watermelon on the functional response of T. bagdasarjani feeding on different densities (2, 4, 8, 16, 32, 64, and 128) of immature stages (larva + protonymph) of Tetranychus urticae Koch. The experiments were conducted under laboratory conditions at 25 ± 1 ℃, 60 ± 5% RH, and a photoperiod of 16:8 (L:D) h. The logistic regression revealed type II functional response on the tomato, eggplant, and watermelon and a type III one on the cucumber. The handling time (Th) and searching efficiency (a) were estimated using the Rogers equation. The highest and lowest values of Th in the type II functional response were recorded on the watermelon (0.927 ± 0.061 h) and eggplant (0.632 ± 0.085 h), respectively. Accordingly, the highest and lowest values of searching efficiency in this type of functional response were obtained on the watermelon (0.055 ± 0.009 h−1) and eggplant (0.028 ± 0.005 h−1), respectively. The maximum predation rate (T/Th) was recorded on the eggplant (37.963 prey/day). On the cucumber, the value estimated for the handling time was 1.341 ± 0.079 h. The maximum predation rate on this host plant was estimated to be 17.90 prey/day. In conclusion, our findings revealed effects of different host plants on the functional response of T. bagdasarjani showing that this species may be more effective in suppressing the population of T. urticae on the cucumber
<p><strong>A practical mass-rearing system for phytoseiid mites: A case study with <em>Amblyseius swirskii</em>, <em>Neoseiulus californicus</em>, and <em>Neoseiulus barkeri</em> (Acari: Phytosiidae)</strong></p>
No full textPhytoseiid mites play a crucial role in biological control programs. Developing efficient mass-rearing techniques for these mites is essential to enhance their applicability in large-scale management programs. This study aimed to develop and validate a simple mass-rearing protocol for the continuous production of generalist phytoseiid mites (Amblyseius swirskii, Neoseiulus californicus, and Neoseiulus barkeri). The rearing system consisted of a Petri dish placed on a water-saturated sponge in a plastic box containing water. Mites were fed a mixture of cattail pollen, rice husk, and Tyrophagus putrecentiae mites which were introduced into the rearing units three times a week. The prey mite was maintained in a similar system using yeast granules and rice husk as food. Population growth of the predatory mites was observed over an 8-week period under controlled laboratory conditions (25 ± 1 °C, 65 ± 5% RH, and 16L:8D photoperiod). The results showed that all three species successfully grew and overpopulated in the 6th week, with 380.2 ± 16.7, 211.4 ± 12.9, and 283.9 ± 18.6 adult females of A. swirskii, N. californicus, and N. barkeri, respectively, being produced. These values represent increases of 38, 21.1, and 28.3 times their respective initial population densities. A gradual decline in the phytoseiids population was observed in each unit following the sixth week. This suggests that the sixth week serves as a suitable time frame for subdividing the rearing units to maintain optimal population levels. The proposed rearing protocol turned out to be useful for the continuous production of the three test species, providing optimal conditions for population growth while preventing mites from escaping the box. This protocol offers a practical solution for the commercial mass production of generalist phytoseiids
