A cash flow EOQ inventory model for non-deteriorating items with constant demand

This study presents an inventory model to determine an optimal ordering policy for non-deteriorating items and time independent demand rate with delay in payments permitted by the supplier under inflation and time discounting, and the rate is assumed to be constant.This study determines the best cycle period and optimal payment period for items so that the annual total relevant cost is minimized. The main purpose of this study is to investigate the optimal (minimum) total present value of the costs over the time horizon H for both cases where the demand is fixed (constant) at any time. This study work is limited to only nondeteriorating goods with constant demand and with a permissible delay in payment.Numerical example and sensitivity analysis are given to evince the applicability of the model.Keywords: Demand, Inventory, Non-Deterioration, Inflation, Delay in payments, Replenishment

NEDAC: A worm countermeasure mechanism

This article presents an Internet worm countermeasure mechanism that uses DNS activities as a behavioural technique to detect worm propagation. The mechanism also uses a data-link containment solution to block traffic from an infected host. The concept has been demonstrated using a developed prototype and tested in a virtualised network environment. An empirical analysis of network worm propagation has been conducted to test the capabilities of the developed countermeasure mechanism. The results show that the developed mechanism is sensitive in containing Internet worms.Keywords: Worm Detection, Malware, cyber defens

The Influence of the Use of the Approach of Blended Learning Model Rotation Based Moodle on Motivation and Cognitive Abilities of Students in the Subjects of Physics

Students' motivation to learn is the main aspect to achieve student success. Based on the results of observation and interview, the learning motivation of students in SMA Negeri 2 Kutacane is still relatively less, so the impact on the low cognitive ability of the students. The purpose of this study is to see the influence of the approach blended learning type station rotation on differences in motivation and cognitive abilities after the study. This research use approach uses quasi-experiments design pretest-posttest control group design. The population of this research is all students of class XI, the sample taken is of class XI IPA 2 as the experimental class and XI IPA 3 as the control class. Using a data collection instrument sheet, questionnaires, and interviews to measure the motivation to learn and use the instrument on a test to measure the cognitive abilities of the students. The results of data analysis using t-test (independent sample t-test) show the differences in motivation and cognitive abilities of students with a significance of 0.000 < 0.05 means there is a significant difference between the motivation and ability of cognitive control and experimental classes. Therefore, it can be concluded that there is an influence of the use of the approach blended learning type station rotation motivation and cognitive abilities of the students.Motivasi belajar siswa sangatlah penting, karena motivasi dalam belajar merupakan aspek penunjang untuk mencapai keberhasilan prestasi yang dicapai. Namun berdasarkan hasil observasi dan wawancara, motivasi belajar siswa di salah satu sekolah masih relatif kurang berdampak terhadap prestasi belajar siswa salah satunya kemampuan kognitif. Metodologi dalam penelitian yang perlu dilakukan adalah pendekatan dengan menggunakan desain eksperimen semu dengan desain pretest posttest control group design yang bertujuan untuk mengetahui pengaruh penggunaan blended learning tipe station rotation terhadap motivasi dan kemampuan kognitif siswa pada mata pelajaran fisika di SMA Kutacane. Populasi dalam penelitian ini adalah seluruh siswa kelas XI yang sampelnya diambil secara purposive sampling yang terdiri dari kelas kontrol dan kelas eksperimen. Instrumen pengumpulan data menggunakan lembar angket dan wawancara untuk mengukur motivasi belajar siswa dan menggunakan instrumen tes untuk mengukur kemampuan kognitif siswa. Hasil analisis data motivasi belajar siswa diperoleh signifikansi 0,000 < 0,05 dan hasil analisis uji t (independent sample t-test) diperoleh signifikansi 0,000 < 0,05 artinya terdapat perbedaan rata-rata signifikan kemampuan motivasi dan kognitif siswa pada kelas eksperimen dan kelas kontrol. Berdasarkan uji statistik menunjukkan adanya pengaruh penggunaan pendekatan blended learning tipe station rotation terhadap motivasi dan kemampuan kognitif siswa

Pengaruh Pendidikan Kesehatan Senam Kaki melalui Media Audio Visual terhadap Pengetahuan Pelaksanaan Senam Kaki pada Pasien DM Tipe 2

The purposes of this research was to determine the effect of health education about foot exercise by using audio visual media for increasing knowledge of foot exercise among DM patients type 2. The design of this study was quasy experiment. 30 respondents was taken by purposive sampling method. The instrument used this questionnaire that had been tested for validity & reliability (0,933). The result showed the effect of health to improve knowledge of foot exercises implementation in respondents with type 2 of DM in the experimental group after giving the health education was siqnificant (p value 0.002 <α 0.05). The results of this study recommends that the health workers provide health education by using audio-visual media to enhance knowledge of the diabetic patient to do foot exercise and prevent the occurrence of complications of diabetic, especially in the legs. Keywords : audio visual media, foot exercises, health education, knowledge References : 62 (2004-2013

Non-identifiability of parameters for a class of shear-thinning rheological models, with implications for haematological fluid dynamics

Choosing a suitable model and determining its associated parameters from fitting to experimental data is fundamental for many problems in biomechanics. Models of shear-thinning complex fluids, dating from the work of Bird, Carreau, Cross and Yasuda, have been applied in highly-cited computational studies of hemodynamics for several decades. In this manuscript we revisit these models, first to highlight a degree of uncertainty in the naming conventions in the literature, but more importantly to address the problem of inferring model parameters by fitting to rheology experiments. By refitting published data, and also by simulation, we find large, flat regions in likelihood surfaces that yield families of parameter sets which fit the data equally well. Despite having almost indistinguishable fits to experimental data these varying parameter sets can predict very different flow profiles, and as such these parameters cannot be used to draw conclusions about physical properties of the fluids, such as zero-shear viscosity or relaxation time of the fluid, or indeed flow behaviours. We verify that these features are not a consequence of the experimental data sets through simulations; by sampling points from the rheological models and adding a small amount of noise we create a synthetic data set which reveals that the problem of param-eter identifiability is intrinsic to these models

Aircraft based four-channel thermal dissociation laser induced fluorescence instrument for simultaneous measurements of NO2, total peroxy nitrate, total alkyl nitrate, and HNO3

A four-channel thermal dissociation laser induced fluorescence (TD-LIF) instrument has been developed for simultaneous measurements of nitrogen dioxide (NO2), total peroxy nitrate (∑PNs), total alkyl nitrate (∑ANs) and nitric acid (HNO3). NO2 is measured directly by LIF at 532 nm, whereas organic nitrates and nitric acid are thermally dissociated at distinct temperatures in the inlet to form NO2, which is then measured by LIF. The concentrations of each dissociated species are derived by the differences in measured NO2 relative to the reference colder inlet channel. The TD-LIF was adapted to fly on board the UK Facility for Airborne Atmospheric Measurements (FAAM) BAe 146-301 atmospheric research aircraft in summer 2010, and to date has successfully flown in five field campaigns. This paper reports novel improvements in the TD-LIF instrumentations, including (1) the use of a single wavelength laser, which makes the system compact and relatively cheap; (2) the use of a single beam laser that allows easy alignment and optical stability against the vibrational aircraft environment; and (3) the optical assembly of four detection cells that allow simultaneous and fast (time resolution up to 0.1 s) measurements of NO2, ∑PNs, ∑ANs and HNO3. Laboratory-generated mixtures of PNs, ANs and HNO3 in zero air are converted into NO2 and used to fix the dissociation temperatures of each heated inlet to test the selectivity of the instrument and potential interferences due to recombination reactions of the dissociated products. The effectiveness of the TD-LIF was demonstrated during the RONOCO aircraft campaign (summer 2010). A chemiluminescence system that was measuring NO2 and a broadband cavity enhanced absorption spectrometer (BBCEAS) that was measuring one of the PNs (N2O5) were installed on the same aircraft during the campaign. The in-flight intercomparison of the new TD-LIF with the chemiluminescence system for NO2 measurements and the intercomparison between ∑PNs measured by the TD-LIF and N2O5 by the BBCEAS are used to assess the performance of the TD-LIF

Soil carbonate analysis using the solvita compost maturity gel system

Soil fertility and nutrient-management programs across Idaho and the western United States need to consider the effective comparison of various extractants for nutrient analysis. Common extractants for primary (potassium; K), secondary (calcium; Ca, magnesium; Mg, sulfur; S) and micro (zinc; Zn, copper; Cu, manganese; Mn, iron; Fe, aluminum; Al, boron; B, sodium; Na,)-nutrients vary (e.g., ammonium acetate, AA, Olsen). The desire to develop relationships among common tests in the region and those of multinutrient extractants used or proposed in other geographical regions has increased due to the interest in soil health measurements (Mehlich-3; M-3 and Haney, Haney, Hossner, Arnold; H3A). To investigate these multinutrient tests, 46 primarily alkaline soils were sampled from the 0 to 30-cm depth in agricultural fields in Idaho. The majority of nutrients were highly related and relationships were developed. However, for Ca issues were noted for M-3 due to high levels of calcium carbonate in the soil interfering with the test on alkaline soils. Additionally, issues were noted for specific micronutrients when both acidic and alkaline soils were combined in the analysis, but were improved when they were separated. Thus, this research provides specific correlation equations that could be used for comparison among tests as well as provides evidence of the potential suitability of multinutrient extractants in the region

Recent advances on information transmission and storage assisted by noise

The interplay between nonlinear dynamic systems and noise has proved to be of great relevance in several application areas. In this presentation, we focus on the areas of information transmission and storage. We review some recent results on information transmission through nonlinear channels assisted by noise. We also present recent proposals of memory devices in which noise plays an essential role. Finally, we discuss new results on the influence of noise in memristors.Comment: To be published in "Theory and Applications of Nonlinear Dynamics: Model and Design of Complex Systems", Proceedings of ICAND 2012 (Springer, 2014