Academic literature on the topic 'Variance counterbalance'
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Journal articles on the topic "Variance counterbalance"
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Zhou, Jian, Guangxu Qin, Jianbing Zhang, Yancheng Li, Qiang He, Yi Han, and Benzhou Gong. "Study on the mutual interactions between the parameters of a CANON system and its coping strategy when operating at room temperature (15 to 25 °C) using response surface methodology." Water Science and Technology 69, no. 9 (February 7, 2014): 1805–12. http://dx.doi.org/10.2166/wst.2014.062.
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The coping strategy of a CANON (completely autotrophic nitrogen removal over nitrite) reactor working at room temperature was investigated using response surface methodology. The total nitrogen (TN) removal efficiency was taken as a dependent variable. The temperature (X), dissolved oxygen (DO) concentration (Y), and influent nitrogen loading rate (Z) were taken as independent variables. Results showed that the relation of these three independent variables can be described by the TN removal efficiency expressed as −5.03 + 1.51X + 45.16Y + 30.13Z + 0.26XY + 1.84XZ − 0.04X2 − 9.06Y2 − 99.00Z2. The analysis of variance proved that the equation is applicable. The response surface demonstrated that the temperature significantly interacts with the DO concentration and influent N loading rate. A coping strategy for the CANON reactor working at room temperature is thus proposed: altering the DO concentration and the N loading rate to counterbalance the impact of low temperature. The verification test proved the strategy is viable. The TN removal efficiency was 91.3% when the reactor was operated under a temperature of 35.0 °C, a DO of 3.0 mg/L, and a N loading rate of 0.70 kgN/(m³ d). When the temperature dropped from 35.0 to 19.2 °C, the TN removal efficiency was kept at 88.7% by regulating the influent N loading rate from 0.7 kgN/(m³ d) to 0.35 kgN/(m³ d) and the DO concentration from 3.0 to 2.6 mg/L.
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Sabarun, Sabarun. "The Effect Of Using ICT Based Graphic Organizer Across The Students’ Difference Level of Writing Ability." IJER (Indonesian Journal of Educational Research) 2, no. 2 (January 1, 2018): 77. http://dx.doi.org/10.30631/ijer.v2i2.43.
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The study is aimed at investigating whether ICT based graphic organizer gives facilitative effect or not across the students' difference level of writing ability. The study belongs to quasi experimental study by applying counterbalance procedure to collect the data. The participants are the 26 students of English department of Palangka Raya State Islamic Institute of 2017/ 2018 academic year. To test the hypotheses, a one way ANOVA test was applied. The research findings shows that, the data fulfills the normality using Shapiro Wilk test (p= 0.420, 0.046, 0.50, and 0.638> 0.05) and homogeneity of variance using Levene’s test (p= 0.541> 0.05). It is found that the F value is45.050, with the significance (p= 0.050> 0.000). Therefore, F table 4.040<45.050>3.190at the 5% and 1% of significant level (Df= 48). It meant that there is a very statistically significant difference on students’ writing achievement both for the bright and poor students between the students who writean expository essay using ICT Based graphic organizer and those who write an expository essay without using ICT Based graphic organizer
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Tong, Jiajin, Robert M. Bickmeier, and Steven G. Rogelberg. "A Comparison of Frequency- and Agreement-Based Response Formats in the Measurement of Burnout and Engagement." International Journal of Environmental Research and Public Health 17, no. 2 (January 15, 2020): 543. http://dx.doi.org/10.3390/ijerph17020543.
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The present research compares and contrasts frequency versus agreement response formats, two approaches to measuring job burnout and work engagement. Construct-based and measurement-based arguments for the superiority of the frequency response format in measuring burnout/engagement are provided, demonstrating that frequency-based measurements will explain relatively more variance in outcome variables. Fair comparison, time order counterbalance, and multiple measuring waves justify the comparison and reduce common method errors of self-report measures. Sample 1 (N = 242) was composed of employees from multiple organizations, while the participants in Sample 2 (N = 281) were employees from one company. Relative importance analysis showed that frequency outperforms the agreement response format in measuring burnout and engagement in both samples. These findings suggest that the frequency response format provides a more valuable method of detecting the dynamic nature of burnout/engagement, which offers methodological guidance for future research involving dynamic constructs. These findings can lead to improvements in the measurement of the dynamic experiences of burnout and engagement. This is one of the first studies to provide evidence whether the dynamic nature of the constructs would have any bearing on the response formats.
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Horn, David, Nir Levy, and Eytan Ruppin. "Memory Maintenance via Neuronal Regulation." Neural Computation 10, no. 1 (January 1, 1998): 1–18. http://dx.doi.org/10.1162/089976698300017863.
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Since their conception half a century ago, Hebbian cell assemblies have become a basic term in the neurosciences, and the idea that learning takes place through synaptic modifications has been accepted as a fundamental paradigm. As synapses undergo continuous metabolic turnover, adopting the stance that memories are engraved in the synaptic matrix raises a fundamental problem: How can memories be maintained for very long time periods? We present a novel solution to this long-standing question, based on biological evidence of neuronal regulation mechanisms that act to maintain neuronal activity. Our mechanism is developed within the framework of a neural model of associative memory. It is operative in conjunction with random activation of the memory system and is able to counterbalance degradation of synaptic weights and normalize the basins of attraction of all memories. Over long time periods, when the variance of the degradation process becomes important, the memory system stabilizes if its synapses are appropriately bounded. Thus, the remnant memory system is obtained by a dynamic process of synaptic selection and growth driven by neuronal regulatory mechanisms. Our model is a specific realization of dynamic stabilization of neural circuitry, which is often assumed to take place during sleep.
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Song, Jaeyoung, Sungbo Shim, Ji-Sun Kim, Jae-Hee Lee, Young-Hwa Byun, and Yeon-Hee Kim. "The Influence of Natural and Anthropogenic Forcing on Water and Energy Balance and on Photosynthesis." Land 10, no. 11 (October 29, 2021): 1151. http://dx.doi.org/10.3390/land10111151.
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Land surface processes are rarely studied in Detection and Attribution Model Inter-comparison Project (DAMIP) experiments on climate change. We analyzed a CMIP6 DAMIP historical experiment by using multi-linear regression (MLRM) and analysis of variance methods. We focused on energy and water budgets, including gross primary productivity (GPP). In MLRM, we estimated each forcing’s contribution and identified the role of natural forcing, which is usually ignored. Contributions of the forcing factors varied by region, and high-ranked variables such as net radiation could receive multiple influences. Greenhouse gases (GHG) accelerated energy and water cycles over the global land surface, including evapotranspiration, runoff, GPP, and water-use efficiency. Aerosol (AER) forcing displayed the opposite characteristics, and natural forcing accounted for short-term changes. A long-term analysis of total soil moisture and water budget indicated that as the AER increases, the available water on the global land increases continuously. In the recent past, an increase in net radiation (i.e., a lowered AER) reduced surface moisture and hastened surface water cycle (GHG effect). The results imply that aerosol emission and its counterbalance to GHG are essential to most land surface processes. The exception to this is GPP, which was overdominated by GHG effects.
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Pérez-Pérez, López-Férnandez, and Obeso. "Knowledge, Renewal and Flexibility: Exploratory Research in Family Firms." Administrative Sciences 9, no. 4 (November 11, 2019): 87. http://dx.doi.org/10.3390/admsci9040087.
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This study aims to explore how family firms pursue strategies that promote strategic flexibility and knowledge-management (KM) practices to respond to strategic-renewal goals. Specifically, based on a knowledge-based view of the firm, the following research question is proposed: Are there heterogeneous groups of family firms in terms of knowledge management, strategic flexibility and strategic renewal goals? To answer this question, an exploratory study using a two-step cluster analysis is developed. It reveals natural groupings from a sample of 288 small and medium-sized Spanish family enterprises (SMEs). The results obtained identified three distinctive clusters of family firms, namely proactive family firms, transitional or adaptive family firms, and rigid family firms. After two-step cluster analysis, we also conducted analysis of variance (ANOVA) to confirm that significant differences amongst the three clusters exist. After heterogeneity been confirmed, a further profile of the cluster solution was provided by using CEO and board characteristics, as well as the generational stage of the company. The findings offer some counterbalance for those studies that tend to study family businesses as a homogeneous entity, thus permitting researchers to access more information, providing rich explanations for renewal managerial decision-making purposes in family firm contexts.
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Price, Steven C., James E. Hill, and Robert W. Allard. "The Morphological and Physiological Response of Slender Oat (Avena barbata) to the Herbicides Barban and Difenzoquat." Weed Science 36, no. 1 (January 1988): 60–69. http://dx.doi.org/10.1017/s0043174500074464.
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The morphological and physiological response of the slender oat (Avena barbataPott ex Link # AVEBA) to the herbicides barban (4-chloro-2-butynyl 3-chlorophenylcarbamate) and difenzoquat (1,2-dimethyl-3,5-diphenyl-1H-pyrazolium) in conjunction with decreased water availability was determined for seven populations, representing three ecotypes, under greenhouse conditions. Generally, within the range of sublethal herbicide doses, with increasing herbicide rates, phytotoxicity ratings increased, but plant dry weight, tiller height, and number of spikelets were decreased. Also, the number of juvenile tillers decreased, while that of fertile tillers increased. Flag leaf area increased and flowering was delayed. The ratio of number of spikelets to plant dry weight and seed weight was influenced the least. Under the highest rates of difenzoquat, the within-plant variance of spikelet number decreased, indicating that there may have been a more equal partitioning of resources amongst tillers for spikelet production. The general influence of water stress was to amplify the effect of the herbicide. For example, the dry treatment reduced dry weight and tiller height, and delayed flowering. Within a particular herbicide treatment, the effect of the water stress was to cause reduced within-plant variance for days to flowering, flag leaf area, and number of spikelets. Three reactions were observed that could have helped buffer decreases in spikelet production: 1) An increased fraction of the dry weight of the plants was partitioned into the spikelets at the expense of other vegetative matter, 2) the increased leaf area of the primary tiller may have helped counterbalance any reduction in photosynthesis caused by herbicide action, and 3) an increased number of juvenile tillers was converted into fertile tillers resulting in an increased number of mature tillers. These data indicate that the slender oat has a remarkable “phenotypic plasticity,” which enables it to maintain reproductive structures under sublethal herbicide doses.
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Matheson, G. O., and D. C. McKenzie. "Breath holding during intense exercise: arterial blood gases, pH, and lactate." Journal of Applied Physiology 64, no. 5 (May 1, 1988): 1947–52. http://dx.doi.org/10.1152/jappl.1988.64.5.1947.
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Seven healthy endurance-trained [maximal O2 uptake (VO2max) = 57.1 +/- 4.1 ml.kg-1.min-1)] female volunteers (mean age 24.4 +/- 3.6 yr) served as subjects in an experiment measuring arterial blood gases, acid-base status, and lactate changes while breath holding (BH) during intense intermittent exercise. By the use of a counterbalance design, each subject repeated five intervals of a 15-s on:30-s off treadmill run at 125% VO2max while BH and while breathing freely (NBH). Arterial blood for pH, PO2, PCO2, O2 saturation (SO2) HCO3, and lactate was sampled from a radial arterial catheter at the end of each work and rest interval and throughout recovery, and the results were analyzed using repeated-measures analysis of variance. Significant reductions in pHa (delta mean = 0.07, P less than 0.01), arterial PO2 (delta mean = 24.2 Torr, P less than 0.01), and O2 saturation (delta mean = 4.6%, P less than 0.01) and elevations in arterial PCO2 (delta mean = 8.2 Torr, P less than 0.01) and arterial HCO3 (delta mean = 1.3 meq/l, P = 0.05) were found at the end of each exercise interval in the BH condition. All of the observed changes in arterial blood gases and acid-base status induced by BH were reversed during the rest intervals. During recovery, significantly (P less than 0.025) greater levels of arterial lactate were found in the BH condition.(ABSTRACT TRUNCATED AT 250 WORDS)
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Plasman, Matthieu, Christel Tiberi, Cecilia Cadio, Anita Thea Saraswati, Gwendoline Pajot-Métivier, and Michel Diament. "From space to lithosphere: inversion of the GOCE gravity gradients. Supply to the Earth’s interior study." Geophysical Journal International 223, no. 1 (June 26, 2020): 398–419. http://dx.doi.org/10.1093/gji/ggaa318.
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SUMMARY The emergence of high resolution satellite measurements of the gravitational field (GOCE mission) offers promising perspectives for the study of the Earth’s interior. These new data call for the development of innovant analysis and interpretation methods. Here we combine a forward prism computation with a Bayesian resolution approach to invert for these gravity gradient data configuration. We apply and test our new method on satellite data configuration, that is 225 km height with a global and homogeneous geographic distribution. We first quantify the resolution of our method according to both data and parametrization characteristics. It appears that for reasonable density contrast values (0.1 g cm−3) crustal structures have to be wider than ∼28 km to be detectable in the GOCE signal. Deeper bodies are distinguishable for greater size (35 km size at 50 km depth, ∼80 km at 300 km depth). We invert the six tensor components, among which five are independent. By carefully testing each of them and their different combinations, we enlighten a trade off between the recovery of data and the sensitivity to inversion parameters. We particularly discussed this characteristic in terms of geometry of the synthetic model tested (structures orientation, 3-D geometry, etc.). In terms of RMS value, each component is always better explained if inverted solely, but the result is strongly affected by the inversion parametrization (smoothing, variances, etc.). On the contrary, the simultaneous inversion of several components displays a significant improvement for the global tensor recovery, more dependent on data than on density variance or on smoothness control. Comparing gravity and gradient inversions, we highlight the superiority of the GG data to better reproduce the structures especially in terms of vertical location. We successfully test our method on a realistic case of a complex subduction case for both gradient and gravity data. While the imaging of small crustal structures requires terrestrial gravity data set, the longest wavelength of the slab is well recovered with both data sets. The precision and homogeneous coverage of GOCE data however, counterbalance the heterogeneous and often quite non-existence coverage of terrestrial gravity data. This is particularly true in large areas which requires a coherent assemblage of heterogeneous data sets, or in high relief, vegetally covered and offshore zones.
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Kim, Hwi-Su, Myeong-Su Bae, Chan-Hun Park, Doo-Hyung Kim, Jin-Ho Kyung, Hyun Min Do, Dong Il Park, Tae-Yong Choi, and Sung-Hyuk Song. "Design of Variable Counterbalance Mechanism Based on Spring to Minimize Required Torque of Robot Arm with Variable Payload." Journal of Institute of Control, Robotics and Systems 26, no. 12 (December 31, 2020): 1039–46. http://dx.doi.org/10.5302/j.icros.2020.20.0152.
Full textDissertations / Theses on the topic "Variance counterbalance"
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Jalayeri, Ehsan. "Design and experimental evaluations of a pump-controlled hydraulic circuit." 2016. http://hdl.handle.net/1993/31143.
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This thesis presents a novel, low cost, high precision , and efficient design for an electro-hydrostatic circuit for single rod hydraulic cylinders. The design is the main contribution of candidate to fulfill the regiments of PhD degree. The challenge of existing deigns of electro-hydrostatic circuits for single-rod cylinders is using one pump to control the cylinder under switching (resistive-assistive) loads. The proposed circuit utilizes off-the-shelf industrial elements. It uses two counterbalance valves to manage switching loads and one on/off solenoid valve to redirect the differential flow of the single rod cylinder to tank. A set of simulation studies is conducted using Simhydraulic tools of Matlab in order to study performances of the proposed circuit and compare it with existing designs. Pump-controlled hydraulic circuit for double rod cylinders was developed and is widely used by industry. It is used as the benchmark for simulation studies. As well, the proposed circuit and two major existing pump-controlled circuits for single rod cylinders are compared to the benchmark circuit. Evaluations are conducted by comparing chamber pressure responses as well as pressure vs position of the cylinder end-effector for each individual circuit. Results indicate that the proposed circuit performed as well as the benchmark circuit by controlling pressures to both sides of the cylinder at the same time. Moreover, the load in the proposed circuit is more controllable compared to the benchmark circuit. Experimental results, obtained from the developed test rig, validate accuracy of the simulation model. Maximum steady state position error of 0.06 mm applications is experimentally observed when the test rig is tested under different loading conditions with various amplitudes and frequencies. The circuit consumes up to 20% of the energy that is required by a valve controlled circuit given the same sinusoidal tracking signal. The relative efficiency of the proposed circuit over a valve
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controlled circuit depends on the pattern and frequency of the tracking signal. In all the experiments, a simple proportional controller, which uses readings of a linear position transducer, is employed. The use of the proportional controller makes the proposed circuit easy to implement and shows it is good candidate for industrial applications. The accuracy of the position response of the proposed circuit indicates, it is a good candidate for robotic applications too.May 2016
Book chapters on the topic "Variance counterbalance"
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Wu, Zhenhang, Manuel Paredes, and Sébastien Seguy. "Constraint Analysis and Optimization of NES System Based on Variable Pitch Spring." In Lecture Notes in Mechanical Engineering, 162–68. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-70566-4_26.
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AbstractThis study proposes the realization of a device with a pure cubic stiffness mechanism to suppress a wide range of vibrations, which is known as the Nonlinear Energy Sink. Deciding how to construct a light, reliable NES device is always a challenge. According to our design, the device can counterbalance the undesirable linear stiffness that emerges from the intrinsic property of a variable pitch spring. Our goal is to reduce the mass of the spring while keeping the same cubic stiffness. Through the multifaceted analysis of the nonlinear constraint, we try to explore the full potential of NES device to reduce its mass. Meanwhile, a global search method, Multi Start, is applied by repeatedly running a local solver. Finally, a new design with different variable pitch distribution is proposed.
Conference papers on the topic "Variance counterbalance"
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Mengren, Jin, and Wang Qingfeng. "An Energy-Saving Way to Balance Variable Negative Load Based on Back-Stepping Control With Load Observer." In BATH/ASME 2016 Symposium on Fluid Power and Motion Control. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/fpmc2016-1722.
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Traditionally, counterbalance valve (CBV) is widely used to counterbalance negative load of fluid power machinery. CBV introduces extra energy consumption and oscillation to hydraulic system especially for time varying system. The essence of its shortcoming is the inflexibility of the control architecture. In this article, a proportional orifice is adopted to counterbalance negative load, which makes the control strategy flexible. A load observer is proposed to demonstrate the load dynamically. A control algorithm based on back-stepping design is proposed in this paper afterwards, aiming at keeping the inlet chamber pressure of the actuator around a fairy small value. The control error is estimated, as well. A simulation for the process of the excavator booming down is carried out to verify the observer and control algorithm, which proves the energy-saving target achieved.