Artigos de revistas: "Isolation de la table de flux"

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Dorodnikov, M., K. H. Knorr, Y. Kuzyakov e M. Wilmking. "Contribution of recent plant photosynthates of Eriophorum vaginatum and Scheuchzeria palustris to methanogenesis and CH4 transport at a boreal mire: a 14C pulse-labeling study". Biogeosciences Discussions 8, n.º 3 (4 de maio de 2011): 4359–89. http://dx.doi.org/10.5194/bgd-8-4359-2011.

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Abstract. Contribution of recent photosynthates to methanogenesis and plant-mediated methane (CH4) transport were studied on two dominating vascular plant species – Eriophorum vaginatum and Scheuchzeria palustris – at three microform types (hummocks, lawns and hollows) of a boreal natural minerogenic, oligotrophic fen in Eastern Finland. Measurements of total CH4 flux, isolation of shoots from entire peat and 14C-pulse labeling of mesocosms under controlled conditions allowed estimation of plant-mediated CH4 flux and contribution of recent (14C) photosynthates to total CH4. The obtained results showed (i) CH4 flux increases in the order E. hummocks ≤ E. lawns < S. hollows corresponding to the increasing water table level of the microforms as derived from in situ measurements. (ii) Plant-mediated CH4 flux accounted for 38, 31 and 51 % of total CH4 at E. hummocks, E. lawns and S. hollows, respectively. (iii) Contribution of recent photosynthates to methanogenesis accounted for 0.03 % for E. hummocks, 0.06 % for E. lawns and 0.13 % for S. hollows of assimilated 14C. Thus, S. palustris microsites are characterized by a higher efficiency for transporting CH4 from the peat column to the atmosphere when compared to E. vaginatum of drier lawns and hummocks. Contribution of recent plant photosynthates to methanogenesis was not depended on the amount of plant biomass: smaller S. palustris had higher 14CH4 as compared to larger E. vaginatum. Therefore, for the assessment of CH4 production and emission over meso- and macroscales as well as for the implication and development of C modeling of CH4 fluxes, it is necessary to account for plant species-specific processes including CH4 production, consumption and transportation and the attribution of those species to topographic microforms.

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Koning, Marvyn T., Rudolf Übelhart, Arjen H. G. Cleven, Willem H. Zoutman, Sander A. J. van der Zeeuw, Philip Kluin, Marieke Griffioen et al. "Antigen-Independent, Autonomous B-Cell Receptor Signaling As a Dominant Candidate Oncogenic Mechanism in ABC DLBCL". Blood 128, n.º 22 (2 de dezembro de 2016): 778. http://dx.doi.org/10.1182/blood.v128.22.778.778.

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Abstract Background The activated B-cell (ABC) type of diffuse large B-cell lymphoma (DLBCL) is clinically more aggressive than the germinal center (GCB) type. The gene expression profile of ABC DLBCL resembles that of mature B cells upon stimulation via their B-cell receptor (BCR). In app. 10% of ABC DLBCL cases, this signature can be explained by gain-of-function mutations in CARD11. Recent evidence suggests that autoantigen recognition by the BCR sustains the viability of ABC DLBCL in vitro (Young, PNAS 2015), although the functional relationship to CARD11 mutations remains unresolved. Antigen-independent, constitutively active BCR signaling is a fundamental oncogenic mechanism of CLL (Dühren-von Minden, Nature 2012). We therefore explored the hypothesis that autonomous BCR signaling akin to CLL could be operative in ABC DLBCL and would represent an alternative but functionally complementary oncogenic mechanism to activating CARD11 mutations in ABC DLBCL lymphomagenesis. Methods BCR transcripts were identified from archived fresh-frozen biopsies of 14 histologically confirmed, CD10-negative, IgM-expressing DLBCL by ARTISAN PCR, a novel anchored RT-PCR for unbiased isolation of full-length BCR transcripts facilitated by template switching (Koning, BJH 2016). Clonal full-length BCR were identified by single molecule sequencing on the PacBio platform. All biopsies were screened for mutations in CARD11 and CD79 by Sanger sequencing. To test for autonomous BCR signaling activity, murine triple KO (TKO) cells were transduced with functional DLBCL BCR (Dühren-von Minden, Nature 2012). TKO cells lack the rag2 and lambda5 genes and are therefore developmentally arrested at the pre-B-cell stage. In addition, TKO cells have their wild-type SLP65 adaptor replaced with a tamoxifen-dependent SLP65 variant. When transduced with a functional BCR, autonomous or antigen-induced BCR signaling can be measured upon restoring functionality of the BCR signalling cascade with tamoxifen as calcium flux by flow cytometry and robust cellular proliferation. Results Re-examination by immunohistochemistry for CD10, PAX5, MUM1, and Bcl-6 was possible in 12 cases and identified three cases as GCB-type DLBCL. Nine cases were classified as non-GCB DLBCL, including one primary CNS DLBCL and three leg-type primary cutaneous DLBCL (LT DLBCL). One non-GCB DLBCL was found to carry a potentially activating CARD11 M212K mutation (Table). BCR of the three GCB DLBCL served as controls and lacked an autonomous BCR signal. In contrast, TKO cells transduced with five of the seven remaining DLBCL BCR (71%) showed robust calcium flux and proliferation upon activation of SLP65 by tamoxifen without additional BCR crosslinking. In accordance with our hypotheses, the CARD11-mutated non-GCB DLBCL case lacked autonomous BCR signaling. This case and the second, non-GCB DLBCL case lacking autonomous BR activity that carried wild-type CARD11 both expressed a BCR with the IGHV4-34 allele. Unexpectedly, the three LT DLBCL also did not exhibit autonomous BCR signaling. Conclusion Our data demonstrate autonomous BCR activity in a dominant fraction of non-GCB DLBCL. In striking similarity to CLL, these results point to an oncogenic role of a structurally normal BCR in non-GCB DLBCL that does not require binding of external autoantigens. Consistent with our hypotheses, antigen-independent signaling of a structurally normal BCR signaling cascade is a compelling candidate alternative mechanism to activating mutations in signal-transducing components of the BCR pathway. Both mechanisms may therefore induce the characteristic gene expression signature of ABC DLBCL. In addition, this finding readily explains the higher likelihood of ABC DLBCL with wild-type CD79 and CARD11 to respond to BCR signaling inhibition by BTK inhibitors (Wilson, Nat Med 2015). In contrast, LT DLBCL, which otherwise resembles ABC DLBCL, does not exhibit autonomous BCR signaling, suggesting yet another oncogenic mechanism that may explain its dismal prognosis. Finally, the non-GCB DLBCL lacking both autonomous BCR signaling and a potentially activating CARD11 mutation expressed the inherently autoreactive IGHV4-34 allele, opening the possibility that strong autoantigen stimulation might substitute for autonomous BCR signaling activity, thereby offering an alternative explanation for the BCR signaling pathway addiction in IGHV4-34-expressing cases. Table. Table. Disclosures Vermeer: Innate Pharma: Other: Investigator in a clinical trial.

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Kainuma, Masakuni. "Vibration isolation table". Journal of the Acoustical Society of America 118, n.º 3 (2005): 1254. http://dx.doi.org/10.1121/1.2097066.

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Kainuma, Masakuni. "Vibration isolation table". Journal of the Acoustical Society of America 119, n.º 2 (2006): 688. http://dx.doi.org/10.1121/1.2174507.

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AKABA, Yoshihito. "Isolation System : Introduction of the Isolation Table for Equipment". Journal of the Society of Mechanical Engineers 116, n.º 1139 (2013): 719–22. http://dx.doi.org/10.1299/jsmemag.116.1139_719.

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El Nakla, M., M. Habib, W. Ahmed, A. Al-Sarkhi, R. Ben Mansour e M. Y. Al-Awwad. "Application of the Critical Heat Flux Look-Up Table to Large Diameter Tubes". Science and Technology of Nuclear Installations 2013 (2013): 1–10. http://dx.doi.org/10.1155/2013/868163.

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The critical heat flux look-up table was applied to a large diameter tube, namely 67 mm inside diameter tube, to predict the occurrence of the phenomenon for both vertical and horizontal uniformly heated tubes. Water was considered as coolant. For the vertical tube, a diameter correction factor was directly applied to the 1995 critical heat flux look-up table. To predict the occurrence of critical heat flux in horizontal tube, an extra correction factor to account for flow stratification was applied. Both derived tables were used to predict the effect of high heat flux and tube blockage on critical heat flux occurrence in boiler tubes. Moreover, the horizontal tube look-up table was used to predict the safety limits of the operation of boiler for 50% allowable heat flux.

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MATSUOKA, Taichi, Kento MITSUI e Kenichiro OHMATA. "Small isolation table using coil springs". Proceedings of Mechanical Engineering Congress, Japan 2016 (2016): J1010203. http://dx.doi.org/10.1299/jsmemecj.2016.j1010203.

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GROENEVELD, D. C., S. C. CHENG e T. DOAN. "1986 AECL-UO Critical Heat Flux Lookup Table". Heat Transfer Engineering 7, n.º 1-2 (janeiro de 1986): 46–62. http://dx.doi.org/10.1080/01457638608939644.

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Moore, T. R., e N. T. Roulet. "Methane flux: Water table relations in northern wetlands". Geophysical Research Letters 20, n.º 7 (9 de abril de 1993): 587–90. http://dx.doi.org/10.1029/93gl00208.

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Jin, Jian Min, Ping Tan, Fu Lin Zhou, Yu Hong Ma e Chao Yong Shen. "Shaking Table Test Study on Mid-Story Isolation Structures". Advanced Materials Research 446-449 (janeiro de 2012): 378–81. http://dx.doi.org/10.4028/www.scientific.net/amr.446-449.378.

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Mid-story isolation structure is developing from base isolation structures. As a complex structural system, the work mechanism of base isolation structure is not entirely appropriate for mid-story isolation structure, and the prolonging of structural natural period may not be able to decrease the seismic response of substructure and superstructure simultaneously. In this paper, for a four-story steel frame model, whose prototype first natural period is about 1s without seismic isolation design, the seismic responses and isolation effectiveness of mid-story isolation system with lead rubber bearing are studied experimentally by changing the location of isolation layer. Respectively, the locations of isolation layer are set at bottom of the first story, top of the first story, top of the second story and top of the third story. The results show that mid-story isolation can reduce seismic response in general, and substructure acceleration may be amplified.

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Barton, Mark A., Takeshi Uchiyama, Kazuaki Kuroda, Nobuyuki Kanda e Hideki Ishizuka. "Two-dimensional X pendulum vibration isolation table". Review of Scientific Instruments 70, n.º 4 (abril de 1999): 2150–54. http://dx.doi.org/10.1063/1.1149728.

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Ali, M. H., I. Abustan e S. Islam. "Simulation of upward flux from shallow water-table using UPFLOW model". Journal of Natural Resources and Development 3 (4 de novembro de 2013): 123–27. http://dx.doi.org/10.5027/jnrd.v3i0.12.

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The upward movement of water by capillary rise from shallow water-table to the root zone is an important incoming flux. For determining exact amount of irrigation requirement, estimation of capillary flux or upward flux is essential. Simulation model can provide a reliable estimate of upward flux under variable soil and climatic conditions. In this study, the performance of model UPFLOW to estimate upward flux was evaluated. Evaluation of model performance was performed with both graphical display and statistical criteria. In distribution of simulated capillary rise values against observed field data, maximum data points lie around the 1:1 line, which means that the model output is reliable and reasonable. The coefficient of determination between observed and simulated values was 0.806 (r = 0.93), which indicates a good inter-relation between observed and simulated values. The relative error, model efficiency, and index of agreement were found as 27.91%, 85.93% and 0.96, respectively. Considering the graphical display of observed and simulated upward flux and statistical indicators, it can be concluded that the overall performance of the UPFLOW model in simulating actual upward flux from a crop field under variable water-table condition is satisfactory. Thus, the model can be used to estimate capillary rise from shallow water-table for proper estimation of irrigation requirement, which would save valuable water from over-irrigation.

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Zhang, Bing, Jing Zhang e Takafumi Yoshida. "Temporal variations of groundwater tables and implications for submarine groundwater discharge: a 3-decade case study in central Japan". Hydrology and Earth System Sciences 21, n.º 7 (11 de julho de 2017): 3417–25. http://dx.doi.org/10.5194/hess-21-3417-2017.

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Abstract. Fresh submarine groundwater discharge (SGD) is the key pathway of flux and nutrients for the groundwater from land to the ocean. SGD flux is a current issue of discussion and a means to clarify the coastal marine system under climate change. SGD flux accounts for about one-quarter of the river runoff in the Katakai alluvial fan in Uozu, Toyama, Japan, which is an ideal area to study SGD flux considering the need for a rapid response to climate change and the prior research on SGD there. In this paper, the monthly groundwater table's condition over 30 years is analyzed using monthly rainfall, snowfall, and the climate change index. Rainfall has been on an upward trend, but the snowfall has decreased over 40 years. Furthermore, the groundwater table at monitoring wells in the coastal area increased, as a result of the increased rainfall. However, the relationship between snowfall and groundwater is negative. As expected by Darcy's law, SGD flux was controlled by the hydraulic gradient of the coastal groundwater. The estimated historic SGD flux by groundwater table variation shows an upward trend of SGD. Considering the increase in precipitation and the groundwater table, SGD flux may increase under climate change.

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Liu, He, e Wang Ya-Jun. "DPC of Cross-compensated Virtual Flux Double Switch Table". Journal of Electrical Engineering and Automation 3, n.º 4 (4 de abril de 2022): 305–21. http://dx.doi.org/10.36548/jeea.2021.4.005.

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Aiming at the problems of large power ripple, high harmonic components and DC bias on the AC side of the three-phase voltage rectifier Direct Power Control (DPC), as well as the shortcomings of the voltage output of the DC side busbar, the direct power control method of the cross-compensated virtual flux double switch meter has been proposed. The virtual flux can realize the sensorless mode on the input side of the circuit to reduce the high harmonic, even if the first-order low-pass filter is used to replace the integration region, there is still some error. On this basis, the two filters are connected in parallel for virtual flux compensation, and then the voltage vector is selected according to the instantaneous power change, and the sector is re-divided with the voltage as the control vector, and two independent switching state tables are designed. The cross-compensated virtual flux double-switch meter DPC is simulated and compared with the traditional DPC waveform, and the experimental results show that the cross-compensated virtual flux double-switch meter DPC strategy can effectively reduce the proportion of harmonic content, control power fluctuations, improve DC bias, has fast tracking effect, stabilize output voltage, and control active and reactive power flexibly. The three-phase voltage rectifier circuit occupies an important position for the pre-rectifier part of the charging power supply of electric vehicles, and the rectifier circuit that can stabilize the output DC voltage cannot only extend its service life for the charging power supply, but also reduce harmonic pollution.

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Takagami, Teruo, e Yasuo Jimbo. "Study of an Active Vibration Isolation System". Journal of Low Frequency Noise, Vibration and Active Control 4, n.º 3 (setembro de 1985): 104–19. http://dx.doi.org/10.1177/026309238500400303.

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Improvements of performance of a vibration isolation table supported by an air-spring are attempted. A servo-control mechanism regulates the air in the air-spring so that the table can always remain immobile in spite of the vibrations of the floor. The principle of this servo-control is as follows. At the instant of upward movement of the table, the air in the air-spring is impelled to flow out. At the instant of downward movement of the table, the air is pushed to flow in. In this paper, a method of determining an optimal control-signal, which regulates the air in the air-spring, is discussed from a learning control standpoint by a microcomputer. For periodic disturbances, adjustment of control signal for both amplitude and phase is applied. For random disturbances, adjustment of control gain only is applicable.

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Zhang, Z., H. Hu, F. Tian, X. Yao e M. Sivapalan. "Groundwater dynamics under water-saving irrigation and implications for sustainable water management in an oasis: Tarim River basin of western China". Hydrology and Earth System Sciences 18, n.º 10 (7 de outubro de 2014): 3951–67. http://dx.doi.org/10.5194/hess-18-3951-2014.

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Abstract. Water is essential for life. Specifically in the oases of inland arid basins, water is a critically limited resource, essential for the development of the socio-economy and the sustainability of eco-environmental systems. Due to the unique hydrological regime present in arid oases, a moderate groundwater table is the goal of sustainable water management. A shallow water table induces serious secondary salinization and collapse of agriculture, while a deep water table causes deterioration of natural vegetation. From the hydrological perspective, the exchange flux between the unsaturated vadose zone and groundwater reservoir is a critical link to understanding regional water table dynamics. This flux is substantially influenced by anthropogenic activities. In the Tarim River basin of western China, where agriculture consumes over 90% of available water resources, the exchange flux between the unsaturated vadose zone and groundwater reservoir is influenced strongly by irrigation. Recently, mulched drip irrigation, a sophisticated water-saving irrigation method, was widely applied in the Tarim River basin, which greatly impacted the exchange flux and thus the regional groundwater dynamics. Capitalizing on recent progress in evaporation measurement techniques, we can now close the water balance and directly quantify the exchange flux at the field scale, thus gaining a better understanding of regional groundwater dynamics. In this study, comprehensive observations of water balance components in an irrigated cropland were implemented in 2012 and 2013 in a typical oasis within the Tarim River basin. The water balance analysis showed that the exchange flux and groundwater dynamics were significantly altered by the application of water-saving irrigation. The exchange flux at the groundwater table is mostly downward (310.5 mm year−1), especially during drip irrigation period and spring flush period, while the upward flux is trivial (16.1 mm year−1) due to the moderate groundwater table depth (annual average depth 2.9 m). Traditional secondary salinization caused by intense phreatic evaporation (fed by upward exchange flux) is alleviated. However, a new form of secondary salinization may be introduced unwittingly if there is lack of water for periodic flushing, especially when brackish water is used in the irrigation. Furthermore, the water saved via drip irrigation has been used in further growth of irrigated lands instead of supporting the ecological system. This could lead to an increased risk of eco-environmental degradation and calls for improved governance schemes. The insights gained from this study can be potentially applied to other arid inland areas (e.g., central Asia) which face similar water shortages and human development problems.

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Yoshioka, H., Y. Takahashi, K. Katayama, T. Imazawa e N. Murai. "An Active Microvibration Isolation System for Hi-tech Manufacturing Facilities". Journal of Vibration and Acoustics 123, n.º 2 (1 de outubro de 2000): 269–75. http://dx.doi.org/10.1115/1.1350566.

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This paper presents an active microvibration isolation system using voice-coil linear motors, and pneumatic and piezoelectric actuators. This system is designed to reduce microvibration of the six degrees-of-freedom associated with the rigid body modes of the vibration isolation table by feeding back the pseudo absolute displacement and velocity of the table. To improve vibration isolation performance, a feed-forward control link is added to the sway components in each dimension. This system can also control bending modes of the table in the frequency range up to 200 Hz by employing a proposed Virtual Tuned-Mass Damper control strategy, which is a type of the pole assignment method. In this approach, the pole locations are chosen by a genetic algorithm. For ambient microvibration of the floor around 0.5 cm/s2 and for small earthquakes of around 8 cm/s2 a reduction by a factor of 100 was achieved in the acceleration of the vibration isolation table. Moreover, the vibration of the isolation table was decreased over the entire frequency range. This system also showed good vibration control performance when an impact excitation was applied directly to the table; vibration was damped out within about 0.1 sec. Additionally, the resonance amplitudes around the bending modes of the table were reduced from 1/5 to 1/15 by the Virtual Tuned-Mass Damper method.

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Richardson, Rob. "A seat at the table". Hospitality Insights 7, n.º 1 (25 de abril de 2023): 1–3. http://dx.doi.org/10.24135/hi.v7i1.138.

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Aotearoa's post-COVID19 hopitality industry is in a sate of flux. COVID19 has seen the industry tipped upside down and this disruption has highlight structuial issues that lay below the surface. To build toward a sustainable, more rewarding future the industry needs to come together, reflect, communicate and plan. But does the industry have the ability or desire to do so?

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Zhang, Z., H. Hu, F. Tian, X. Yao e M. Sivapalan. "Groundwater Dynamics under Water Saving Irrigation and Implications for Sustainable Water Management in an Oasis: Tarim River Basin of Western China". Hydrology and Earth System Sciences Discussions 11, n.º 2 (10 de fevereiro de 2014): 1777–820. http://dx.doi.org/10.5194/hessd-11-1777-2014.

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Abstract. Water is essential for life. Specifically in the oases of inland arid basins, water is a critically limited resource, essential for the development of socio-economy and sustainability of eco-environmental systems. Due to the unique hydrological regime present in arid oases, a moderate groundwater table is the goal of sustainable water management. A shallow water table induces serious secondary salinization and collapse of agriculture, while a deep water table causes deterioration of natural vegetation. From the hydrological perspective, the exchange flux between unsaturated vadose zone and groundwater reservoir is a critical link to understand regional water table dynamics. This flux is substantially influenced by anthropogenic activities. In Tarim River Basin of western China, where agriculture consumes over 90% of available water resources, the exchange flux is influenced strongly by irrigation. Recently, mulched drip irrigation, a very advanced water-saving irrigation method, has been widely applied in the Tarim River Basin, which greatly impacted the exchange flux and thus the regional groundwater dynamics. Capitalizing on recent progress in evaporation measurement techniques, we can now close the water balance and directly quantify the exchange flux at the field scale, thus gain a better understanding of regional groundwater dynamics. In this study, comprehensive observations of water balance components in an irrigated cropland were implemented in 2011 and 2012 in a typical oasis within Tarim River Basin. The water balance analysis showed that the exchange flux and groundwater dynamics were significantly altered by the application of water-saving irrigation. The exchange flux is mostly downward (310.5 mm yr−1), especially during drip irrigation period and spring flush period, while the upward flux is trivial (−16.1 mm yr−1) due to the moderate groundwater table depth (annual average depth 2.9 m). Traditional secondary salinization caused by intense phreatic evaporation (fed by upward exchange flux) is alleviated. However, a new form of secondary salinization may be introduced unwittingly if there is lack of water for periodic flushing, especially when brackish water is used in the irrigation. Furthermore, the water saved via drip irrigation has been used in further growth of irrigated lands instead of supporting ecological system. This would lead to increasing risk of eco-environmental degradation and calls for improved governance schemes. The insights gained from this study can be potentially applied to other arid inland areas (e.g., central Asia, sub-Saharan Africa) which face similar water shortages and human development problems.

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Hädrich, Steffen, Arno Klenke, Jan Rothhardt, Manuel Krebs, Armin Hoffmann, Oleg Pronin, Vladimir Pervak, Jens Limpert e Andreas Tünnermann. "High photon flux table-top coherent extreme-ultraviolet source". Nature Photonics 8, n.º 10 (14 de setembro de 2014): 779–83. http://dx.doi.org/10.1038/nphoton.2014.214.

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Mokhtari, Bachir, e Mohamed F. Benkhoris. "High Ripples Reduction in DTC of Induction Motor by Using a New Reduced Switching Table". Journal of Electrical Engineering 67, n.º 3 (1 de maio de 2016): 206–11. http://dx.doi.org/10.1515/jee-2016-0029.

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Abstract The direct torque and flux control (DTC) of electrical motors is characterized by ripples of torque and flux. Among the many solutions proposed to reduce them is to use modified switching tables which is very advantageous; because its implementation is easy and requires no additional cost compared to other solutions. This paper proposes a new reduced switching table (RST) to improve the DTC by reducing harmful ripples of torque and flux. This new switching table is smaller than the conventional one (CST) and depends principally at the flux error. This solution is studied by simulation under Matlab/Simulink and experimentally validated on a testbed with DSPACE1103. The results obtained of a DTC with RST applied to a three-phase induction motor (IM) show a good improvement and an effectiveness of proposed solution, the torque ripple decreases about 47% and 3% for the stator flux compared with a basic DTC.

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Constantinou, M. C., Allaoua Kartoum, A. M. Reinhorn e Paul Bradford. "Sliding Isolation System for Bridges: Experimental Study". Earthquake Spectra 8, n.º 3 (agosto de 1992): 321–44. http://dx.doi.org/10.1193/1.1585684.

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A seismic isolation system for bridges has been tested on a shake table. The system consisted of Teflon disc bridge bearings and displacement control devices. These devices provided restoring force for re-centering the bridge during earthquake excitation, additional energy dissipation capacity and rigidity for service loading. The tests were carried out with a 51-kip model which was subjected to strong recorded earthquake motions with a wide range of frequency content and to simulated motions compatible with CalTrans 0.6g design spectra. In all tests the isolated deck responded with peak acceleration less than the peak table acceleration and peak bearing displacement less than the peak table displacement. Results from an analytical model show very good agreement with experimental results.

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Fan, Y., e G. Miguez-Macho. "Potential groundwater contribution to Amazon evapotranspiration". Hydrology and Earth System Sciences 14, n.º 10 (25 de outubro de 2010): 2039–56. http://dx.doi.org/10.5194/hess-14-2039-2010.

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Abstract. Climate and land ecosystem models simulate a dry-season vegetation stress in the Amazon forest, but observations do not support these results, indicating adequate water supply. Proposed mechanisms include larger soil water store and deeper roots in nature and the ability of roots to move water up and down (hydraulic redistribution), both absent in the models. Here we provide a first-order assessment of the potential importance of the upward soil water flux from the groundwater driven by capillarity. We present a map of equilibrium water table depth from available observations and a groundwater model simulation constrained by these observations. We then present a map of maximum capillary flux these water table depths, combined with the fine-textured soils in the Amazon, can potentially support. The maps show that the water table beneath the Amazon can be shallow in lowlands and river valleys (<5 m in 36% and <10 m in 60% of Amazonia). These water table depths can potentially accommodate a maximum capillary flux of 2.1 mm day−1 to the land surface averaged over Amazonia, but varies from 0.6 to 3.7 mm day−1 across nine study sites. We note that the results presented here are based on limited observations and simple equilibrium model calculations, and as such, have important limitations and must be interpreted accordingly. The potential capillary fluxes are not indicative of their contribution to the actual evapotranspiration, and they are only an assessment of the possible rate at which this flux can occur, to illustrate the power of soil capillary force acting on a shallow water table in fine textured soils. They may over-estimate the actual flux where the surface soils remain moist. Their contribution to the actual evapotranspiration can only be assessed through fully coupled model simulation of the dynamic feedbacks between soil water and groundwater with sub-daily climate forcing. The equilibrium water table obtained here serves as the initial state for the dynamic simulation, and together with the equilibrium potential capillary flux, will serve as a baseline to evaluate the diurnal, event, seasonal and inter-annual dynamics.

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Kim, Do-Yun, e Jung-Hyo Lee. "Low Cost Simple Look-Up Table-Based PMSM Drive Considering DC-Link Voltage Variation". Energies 13, n.º 15 (31 de julho de 2020): 3904. http://dx.doi.org/10.3390/en13153904.

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This paper proposes a permanent magnet synchronous machine (PMSM) table-based torque control method considering a variable DC-link voltage that can be used in a low cost DSP. The current reference generation based on two-dimensional look-up table (2D-LUT) is widely used for PMSM drives used in industrial applications because of its torque control performance and operation stability. In general, a 2D-LUT is established based on the flux and torque to overcome the variation in DC-link voltage. However, this method requires a flux estimator for estimating the instantaneous flux, which is defined as a division of the operating speed used to obtain the flux data. Therefore, to obtain the operating flux, a variable division calculation or complex controller is used, which can be difficult to process through a low cost digital signal processor. In this paper, a novel look-up table-based control method that uses the newly established speed-torque 2D-LUT is proposed. This 2D-LUT inherently implements data on the d-/q-axis currents throughout the operating regions, not only the speed and torque, but also the DC-link voltage variation. The proposed method was verified through an experiment on the torque control a variation in the DC-link voltage.

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NARUKE, Masahiko, Masahiro NISHI, Takashi SYONO, Toru WATANABE e Kazuto SETO. "Motion and Vibration Control for Flexible Isolation Table". Proceedings of the JSME annual meeting 2003.6 (2003): 65–66. http://dx.doi.org/10.1299/jsmemecjo.2003.6.0_65.

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李, 杨. "Optimization Research of Air Gap Flux and Table Magnetic Flux Leakage in Electrodynamic Vibration Generator". Mechanical Engineering and Technology 11, n.º 04 (2022): 400–409. http://dx.doi.org/10.12677/met.2022.114046.

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Roulet, Nigel T., R. Ash, W. Quinton e Tim Moore. "Methane flux from drained northern peatlands: Effect of a persistent water table lowering on flux". Global Biogeochemical Cycles 7, n.º 4 (dezembro de 1993): 749–69. http://dx.doi.org/10.1029/93gb01931.

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Yan, Xiao Yu, Li Hui Wang e Xiu Li Du. "Shaking Table Test on Seismic Response of Isolated Bridge". Applied Mechanics and Materials 275-277 (janeiro de 2013): 1034–39. http://dx.doi.org/10.4028/www.scientific.net/amm.275-277.1034.

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In order to investigate isolation effectiveness on seismic performance of the continuous rigid frame bridge, shaking table test with nine sub-tables on 1/10 scaled reinforced concrete rigid frame bridge specimen was performed. The experimental results demonstrate that isolation devices provide flexibility to transform natural period of the scaled model, and additional it can improve the ability of energy dissipation when lead is used. The initial first frequency is 8.17Hz for plate-type rubber bearing and 9.12Hz for leading rubber bearing. The plate rubber bearing and lead-rubber bearing are quite sensitive to seismic wave frequency. The use of various isolation devices affects response of the bridge model. The results show that the more difference in the isolation devices, the more difference in response. Moreover, isolation effect of lead-rubber bearing show obviously more advantage than the one of plate-type rubber bearing, especially in controlling responses of the bridge during major earthquakes.

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Fan, Y., e G. Miguez-Macho. "Potential groundwater contribution to Amazon evapotranspiration". Hydrology and Earth System Sciences Discussions 7, n.º 4 (30 de julho de 2010): 5131–70. http://dx.doi.org/10.5194/hessd-7-5131-2010.

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Abstract. Climate and land ecosystem models simulate a dry-season vegetation stress in the Amazon forest, but observations show enhanced growth in response to higher radiation under less cloudy skies, indicating an adequate water supply. Proposed mechanisms include larger soil water store and deeper roots in nature and the ability of roots to move water up and down (hydraulic redistribution). Here we assess the importance of the upward soil water flux from the groundwater driven by capillarity. We present a map of water table depth from observations and groundwater modeling, and a map of potential capillary flux these water table depths can sustain. The maps show that the water table beneath the Amazon can be quite shallow in lowlands and river valleys (<5 m in 36% and <10 m in 60% of Amazonia). The water table can potentially sustain a capillary flux of >2.1 mm day−1 to the land surface averaged over Amazonia, but varies from 0.6 to 3.7 mm day−1 across nine study sites. Current models simulate a large-scale reduction in dry-season photosynthesis under today's climate and a possible dieback under projected future climate with a longer dry season, converting the Amazon from a net carbon sink to a source and accelerating warming. The inclusion of groundwater and capillary flux may modify the model results.

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30

Jin, Jian Min, Ping Tan, Fu Lin Zhou e Xiang Yun Huang. "Shaking Table Test Study on Mid-Story Isolation Structures with Viscous Damper". Applied Mechanics and Materials 226-228 (novembro de 2012): 1149–52. http://dx.doi.org/10.4028/www.scientific.net/amm.226-228.1149.

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Mid-story isolation structure is developing from base isolation structures. As a complex structural system, the work mechanism of base isolation structure is not entirely appropriate for mid-story isolation structure, and the prolonging of structural natural period may not be able to decrease the seismic response of substructure and superstructure simultaneously. In this paper, for a four-story steel frame model, whose prototype first natural period is about 1s without seismic isolation design, the seismic responses and isolation effectiveness of mid-story isolation system with linear natural rubber bearing and viscous damper are studied experimentally by changing the location of isolation layer. Respectively, the locations of isolation layer are set at bottom of the first story, top of the first story, top of the second story and top of the third story. The results show that mid-story isolation can reduce seismic response in general, and substructure acceleration may be amplified.

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Xiao, Yifu, Shouping Shang e Zhen Wang. "Shaking Table Experiment and Energy Analysis of a New Rebar Isolation Pier". Advances in Civil Engineering 2021 (29 de janeiro de 2021): 1–15. http://dx.doi.org/10.1155/2021/8895586.

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This paper introduces the structure and principle of a new isolation device—rebar isolation pier—which is mainly composed of vertical steel bar and asphalt ointment. It is used to reduce the earthquake action of the building structure. Compared with other isolation devices, the rebar isolation pier has the following advantages: simple structure, convenient construction, low cost, simple maintenance, and easy to fetch material. In the experiment, the test model is a two-layer frame, and the Taft wave and the Wolong wave were selected to simulate the actual earthquake. In order to study the damping effect of asphalt ointment, two different isolation piers (filled and unfilled with asphalt ointment) were included. The dynamic characteristics and isolation effect of the rebar isolation pier are studied by analysis of acceleration, displacement, and hysteresis loops. At the same time, according to the principle of energy method, the energy balance equation of the rebar isolation pier was proposed, and the total input energy and damping energy are used to analyze the energy of the isolation pier. The results demonstrate that the rebar isolation pier can effectively reduce the natural frequency, acceleration response, and absorbed seismic energy of the structure when the peak ground acceleration reaches 0.3 g, and it still has the potential to withstand greater seismic action.

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Zheng, Guo Chen, e Hang Li Xu. "Research on Shaking Table Test of Base and Story Isolation Structures". Applied Mechanics and Materials 580-583 (julho de 2014): 1776–81. http://dx.doi.org/10.4028/www.scientific.net/amm.580-583.1776.

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The shaking table tests are conducted on a 5-floor steel frame model with a scale down of 1:6. The traditional anti-seismic structure and isolation structures with isolation layer in different position are adopted. The results indicate that the natural vibration periods of isolation structure are longer than anti-seismic structure, and when the isolation layer is located in a lower position, the period becomes longer and the damping effect is better.

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van Huissteden, J., R. van den Bos e I. Marticorena Alvarez. "Modelling the effect of water-table management on CO2 and CH4 fluxes from peat soils". Netherlands Journal of Geosciences - Geologie en Mijnbouw 85, n.º 1 (março de 2006): 3–18. http://dx.doi.org/10.1017/s0016774600021399.

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AbstractDrainage of peatlands for agriculture causes an increase of CO2 flux from peat decomposition, contributing to national CO2 emission. The reverse process, i.e. for re-creation of wetlands, reduces the CO2 flux, but increases the CH4 flux. We developed a process model (PEATLAND) to simulate these fluxes from peat soils subject to different water-table management scenarios. The model combines primary production, aerobic decomposition of soil organic matter (including the soil-parent material, peat), CH4 formation, oxidation, and transport. Model input requires specification of water table and air temperature data sets, vegetation parameters such as primary production and parameters related to gas transport, and basic soil physical data.Validation using closed flux-chamber measurements of CO2 and CH4 from five different sites in the western Netherlands shows that seasonal changes in fluxes of CO2 and CH4 are correctly modelled. However, the CO2 submodel underestimates peat decomposition when peat decomposition rates obtained from laboratory incubation experiments are used as input. Field decomposition rates are considerably higher. This is attributed to enhancement of decomposition by the addition of easily decomposable material from root exudation (’priming effect’). Model experiments indicate that 1) drainage increases the CO2 production from peat decomposition strongly; 2) restoring a high water table may decrease the total greenhouse gas flux by a small amount although the CH4 flux increases strongly; 3) a warmer climate may cause higher greenhouse gas fluxes from peat soils resulting in a positive feedback to climate warming, and 4) high vegetation productivity in fen meadows may stimulate peat decomposition by the priming effect.

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Sharma, P. K., A. K. Sinha e T. N. Chaudhaby. "Upward flux of water and deep-placed P in relation to soil texture, water table depth and evaporation rate". Journal of Agricultural Science 104, n.º 2 (abril de 1985): 303–7. http://dx.doi.org/10.1017/s0021859600043963.

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SummaryUpward flux of water and deep-placed (8–10 cm) P was studied in columns of sandyloam and silty clay loam, with water tables of 60 and 90 cm, each subjected to potential evaporation rates of 2–2 and 7–5 mm/day, for 15 days. An amount of 300 mg P/kg soil, labelled with 20 /tCi 32P/g P, was applied as diammonium hydrogen orthophosphate.Evaporation losses increased with increase in potential evaporation (PE) and decrease in depth to water table in both soils, but the ratio of actual to potential evaporation (AE/PE) decreased with increasing PE, indicating that the evaporative losses in both the soils were mainly controlled by their hydraulic conductive properties. Under no circumstances did AE equal PE. Evaporation, in general, was higher from sandy loam than from silty clay loam.Corresponding to water flux, total upward P flux increased with increasing PE and decreasing depth to water. In the sandy loam, with 2–2 mm PE/day, 21 % of the deepplaced P moved to the soil surface with the 60 cm water table, against 5 % with the 90 cm water table. Under 7–5 mm PE/day, 39% P migrated to the surface with the 60 cm water table, but no 3aP was detected at the surface with the 90 cm water table. In the silty clay loam, however, P movement was much restricted.

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Sérvulo, Ana C. O., Lucas M. Vellame, Derblai Casaroli, José Alves Júnior e Pedro H. de Souza. "African Mahogany transpiration with Granier method and water table lysimeter". Revista Brasileira de Engenharia Agrícola e Ambiental 21, n.º 5 (maio de 2017): 322–26. http://dx.doi.org/10.1590/1807-1929/agriambi.v21n5p322-326.

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ABSTRACT The thermal dissipation probe (Granier method) is useful in the water deficit monitoring and irrigation management of African Mahogany, but its model needs proper adjustment. This paper aimed to adjust and validate the Granier sap flux model to estimate African Mahogany transpiration, measure transpiration using lysimeter and relate it to atmospheric water demand. Weather conditions, transpiration and sap flux were monitored in three units of 2.5-year-old African Mahogany trees in constant water table lysimeter, in Goiânia, GO. Sapwood area (SA), leaf area (LA), transpiration measured by lysimeter (TLYS) and estimated by sap flux (TSF) were evaluated. The SA comprised 55.24% of the trunk’s transversal section. The LA varied from 11.95 to 10.66 m2. TLYS and TSF varied from 2.94 to 29.31 and from 0.94 to 15.45 L d-1, respectively. The original model underestimated transpiration by 44.4%, being the adjusted equation F = 268.25 . k1.231. SA was significant (F < 0.05). Due the root confinement, the transpiration showed low correlation, but positive, with the atmospheric water demand.

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Yan, Lei, Qingning Li, Chun Han e Haotian Jiang. "Shaking Table Tests of Curved Bridge considering Bearing Friction Sliding Isolation". Shock and Vibration 2016 (2016): 1–14. http://dx.doi.org/10.1155/2016/6245062.

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Specific to severe damage to curved bridges in earthquakes caused by the excessive force of the fixed bearings and piers, a new seismic design method on curved bridges considering bearing friction sliding isolation is proposed in this paper. Seismic model bridge and isolation model bridge with similarity ratio of 1/20 were made and the shaking table comparison test was conducted. The experimental results show that the isolation model curved bridge suffered less seismic damage than the seismic model curved bridge. The fundamental frequencies of the seismic model bridge and isolation model bridge decreased and the damping ratio increased with the increase of seismic intensity. Compared with seismic curved bridge, the maximum reduction rates of peak acceleration along the radial and tangential directions on the top of pier of the isolation model curved bridge were 47.3% and 55.5%, respectively, and the maximum reduction rate of the peak strain on the bottom of pier of the isolation model curved bridge was 43.4%. For the isolation model curved bridge, the maximum reduction rate of peak acceleration on the top of pier was 24.6% compared with that on the bottom of pier. The study results can provide experimental basis for the seismic design of curved bridges.

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Wang, Shuo, Vasyl Varvolik, Yuli Bao, Ahmed Aboelhassan, Michele Degano, Giampaolo Buticchi e He Zhang. "Automated Maximum Torque per Ampere Identification for Synchronous Reluctance Machines with Limited Flux Linkage Information". Machines 12, n.º 2 (29 de janeiro de 2024): 96. http://dx.doi.org/10.3390/machines12020096.

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The synchronous reluctance machine is well-known for its highly nonlinear magnetic saturation and cross-saturation characteristics. For high performance and high-efficiency control, the flux-linkage maps and maximum torque per ampere table are of paramount importance. This study proposes a novel automated online searching method for obtaining accurate flux-linkage and maximum torque per ampere Identification. A limited 6 × 2 dq-axis flux-linkage look-up table is acquired by applying symmetric triangle pulses during the self-commissioning stage. Then, three three-dimensional modified linear cubic spline interpolation methods are applied to extend the flux-linkage map. The proposed golden section searching method can be easily implemented to realize higher maximum torque per ampere accuracy after 11 iterations with a standard drive, which is a proven faster solution with reduced memory sources occupied. The proposed algorithm is verified and tested on a 15-kW SynRM drive. Furthermore, the iterative and execution times are evaluated.

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OHMATA, Kenichiro, Hirofumi KONDO, Haruo SHIMOSAKA e Hirokazu SHIMODA. "A Study of an Isolation Table Using an X-Y Table and Spiral Springs." Transactions of the Japan Society of Mechanical Engineers Series C 68, n.º 667 (2002): 786–92. http://dx.doi.org/10.1299/kikaic.68.786.

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Wang, H., FJ Lin, ZH Xia e Y. Shi. "Shaking Table Test for Seismic Isolation Performance of Adjustable Height Seismic Isolation Rubber Bearing". Journal of Physics: Conference Series 2476, n.º 1 (1 de abril de 2023): 012035. http://dx.doi.org/10.1088/1742-6596/2476/1/012035.

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Abstract To study the seismic isolation effect of adjustable height seismic isolation rubber bearing, a continuous girder bridge was subjected to a shaking table test study with full bridge scaling to compare the seismic isolation effects of plate rubber bearings, natural rubber bearings (LNR) and adjustable height seismic isolation rubber bearings under different types of seismic waves, loading directions and seismic intensities.The test results show that when the seismic intensity is small, the seismic isolation performance of the three types of bearings is relatively close. But when the seismic intensity is large, the seismic isolation effect of the adjustable height isolation bearing is better than that of the plate rubber bearing and LNR bearing. Adjustable height isolation rubber bearing can significantly reduce the acceleration of the bridge deck plate, shear force and bending moment in the bottom of piers.

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Li, Zhen, Lei Wu, Hu Zhang, Yueming Li e Heow Pueh Lee. "Dual-functional metamaterial with vibration isolation and heat flux guiding". Journal of Sound and Vibration 469 (março de 2020): 115122. http://dx.doi.org/10.1016/j.jsv.2019.115122.

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Rallet, Alain, Guy Gilbert, Jean-Marc Offner, Michel Savy e Hubert Jayet. "Table ronde : L'équité territoriale. Une interview de Pierre-Henri Derycke". Flux 13, n.º 27 (1997): 71–82. http://dx.doi.org/10.3406/flux.1997.1205.

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Jin, Jian Min, Ping Tan, Fu Lin Zhou, Yu Hong Ma e Chao Yong Shen. "Shaking Table Test Study on Mid-Story Isolation Structures". Advanced Materials Research 446-449 (janeiro de 2012): 378–81. http://dx.doi.org/10.4028/scientific5/amr.446-449.378.

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Yuan, Kang, Dan Gan, Junlin Guo e Wenjie Xu. "Hybrid geotechnical and structural seismic isolation: Shake table tests". Earthquake Engineering & Structural Dynamics 50, n.º 12 (18 de junho de 2021): 3184–200. http://dx.doi.org/10.1002/eqe.3505.

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Paulson, T. J., D. P. Abrams e R. L. Mayes. "Shaking‐Table Study of Base Isolation for Masonry Buildings". Journal of Structural Engineering 117, n.º 11 (novembro de 1991): 3315–36. http://dx.doi.org/10.1061/(asce)0733-9445(1991)117:11(3315).

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Ueda, Masaharu, Masaaki Matuura, Kenichiro Ohmata e Hideaki Matsushima. "3406 Development of a Three-Dimensional Seismic Isolation Table". Proceedings of Design & Systems Conference 2005.15 (2005): 542–45. http://dx.doi.org/10.1299/jsmedsd.2005.15.542.

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MATSUOKA, Taichi, Tenma TAKAYANAGI, Tomonori NIWA e Kenichiro OHMATA. "Study on small seismic isolation table using coil springs". Transactions of the JSME (in Japanese) 81, n.º 825 (2015): 14–00607. http://dx.doi.org/10.1299/transjsme.14-00607.

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WATANABE, Kotaro, Haruo SHIMOSAKA e Kenichiro OHMATA. "Isolation Table Using Circular Arc Beams and Magnetic Damping." Transactions of the Japan Society of Mechanical Engineers Series C 62, n.º 599 (1996): 2571–76. http://dx.doi.org/10.1299/kikaic.62.2571.

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Villaverde, Roberto, e Gilberto Mosqueda. "Aseismic roof isolation system: analytic and shake table studies". Earthquake Engineering & Structural Dynamics 28, n.º 3 (março de 1999): 217–34. http://dx.doi.org/10.1002/(sici)1096-9845(199903)28:3<217::aid-eqe813>3.0.co;2-g.

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Moss, Anthony G. "Air Tables Are Not Always Needed for Vibration Isolation". Microscopy Today 7, n.º 4 (maio de 1999): 27. http://dx.doi.org/10.1017/s1551929500064300.

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Most of the time an air table is not needed for vibration isolation of electrophysiological equipment and microscopes. In fact, an air table can be a liability in that it is likely to pick up air-borne vibrations. This is especially likefy if you have a solid enclosure, as is often used for the construction of Faraday cages used in electrophysiological investigations of vision research. Sound propagation can be particularly annoying, especially at the lower frequencies. Such important details are often forgotten in discussions of this topic.A good damping table will help reduce the resonances, but still often can't overcome the difficulty posed by sound. One of the best solutions is proper placement of the entire rig: on the slab in the basement in a quiet place with no heavy vibrations from nearby heating, ventilating, and airconditioning (HVAC) and other equipment.

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Zhang, Rui, Xinying Song, Zongze Cui, Wei Hao, Cong Xu e Liwei Song. "Distributed Modeling of Isolated Active Magnetic Bearings Considering Magnetic Leakage and Material Nonlinearity". Energies 16, n.º 24 (12 de dezembro de 2023): 8023. http://dx.doi.org/10.3390/en16248023.

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In order to expand the application field of magnetic bearings, this article studies a novel radially isolated active magnetic bearing (IAMB) system in which the stator and the rotor are separated by a layer of metal isolation sleeve. Aimed at the shortcomings of existing modeling methods, a distributed magnetic circuit model (DMCM) was proposed based on the magnetic field segmentation theory for IAMBs. Considering material nonlinearity and leakage flux, the flux distributions of the isolation sleeve and air gap are calculated accurately. Finally, the 3D finite element model (3D FEM) and experimental platform were built to verify the feasibility of the IAMB and the correctness of the DMCM.

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