The Experts below are selected from a list of 48723 Experts worldwide ranked by ideXlab platform
Daisuke Hirooka - One of the best experts on this subject based on the ideXlab platform.
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Optimization of orifice position in particle-excitation valve for proportional Flow control
'Springer Science and Business Media LLC', 2017Co-Authors: Daisuke Hirooka, Tomomi Yamaguchi, Naomichi Furushiro, Koichi Suzumori, Takefumi KandaAbstract:Abstract This paper reports an improvement of the particle-excitation Flow control valve. The valve that we have designed in previous reports can control air Flow, using particle excitation by piezoelectric resonance, and has the following advantages: small size, lightweight, high response and continuous airFlow control. However, in our previous models, the relationship between the driving voltage and the Flow Quantity was nonlinear. In this report, we improved the valve to realize proportional Flow control. The valve consists of the orifice plate, that has some orifices, and steel particles to seal the orifices and piezoelectric transducer. It controls air Flow by the voltage applied to the transducer. For proportional Flow control, it is important to adjust the orifice position adequately. In this report, we optimized the orifice position, considering resonance condition of the valve. We designed the experimental prototype using a bolt-clamped Langevin type transducer and decided orifice position. And we evaluated its vibration properties and Flow-rate characteristics. The experimental results showed that our designed prototype can proportionally control airFlow
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Design and evaluation of orifice arrangement for particle-excitation Flow control valve
Sensors and Actuators A: Physical, 2011Co-Authors: Daisuke HirookaAbstract:Abstract In this article, we report a new particle-excitation Flow control valve. The purpose of this study is the development of a particle-excitation Flow control valve that can precisely control pneumatic cylinders. We have reported this Flow control valve principle. The valve, driven by a PZT vibrator, has a simple lightweight structure with large Flow rate. We report the relationship between the orifice arrangement and Flow rate characteristics of the valve. We have designed a new prototype for the purpose of high controllability. We have measured Flow-rate characteristics and confirmed the conditions necessary for continuous adjustment of Flow Quantity. The control valve works successfully to realize a change in Flow rate.
Wen Xianmin - One of the best experts on this subject based on the ideXlab platform.
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value of colored doppler forecast the esophagus varicosity degree and the hemorrhage risk
China Practical Medicine, 2009Co-Authors: Wen XianminAbstract:Objective To dtermines left gastric vein(LGV) and portal vein (PV)blood Flow dynamics vein diameter、blood Flow speed,blood Flow Quantity,blood Flow direction) through colored Doppler,discusses its evaluation of LGV and PV blood Flow dynamics predicting esophageal variceal bleeding in patient with liver cirrhosis complicated portal hypertension.Methods 86 liver cirrhosis complicated portal hypertension patients accept examinations including colored Doppler、 endoscope、hepatia and so on. Contrast analysis hemorrhage group and non-hemorrhage group's LGV and PV blood Flow dynamics characteristic. Results Along with esophagus varicosity degree aggravating,the LGV and PV inside diameter assumes by gradually increases the width the tendency; The LGV has remarkable difference to the liver blood stream direction in the hemorrhage group with the non-hemorrhage group (χ2=12.049,P=0.00),this kind of remarkable difference exists in under the Child graduation three levels of liver function condition. Take LGV inside diameter 6 mm,PV inside diameter 16 mm as forecast the esophagus varicosity hemorrhage risk lamination target,bleeds in the patient PV inside diameter ≥ 16 mm to compare the existence remarkable difference with the non-hemorrhage group (χ2=4.21,P=0.04). Conclusion Colored Doppler determines LGV blood stream direction,PV the inside diameter forecast the esophagus varicosity hemorrhage risk has the application value,in forecast esophagus varicosity degree LGV,PV blood stream dynamics parameter not remarkable value.
Tian Hao - One of the best experts on this subject based on the ideXlab platform.
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value of colored doppler forecast the esophagus varicosity hemorrhage risk
China Practical Medicine, 2008Co-Authors: Tian HaoAbstract:Objective To determine left gastric vein(LGV)and portal vein(PV)blood Flow dynamics vein diameter,blood Flow speed,blood Flow Quantity,blood Flow direction through colored Doppler,discuss its evaluation of LGV and PV blood Flow dynamics predicting esophageal variceal bleeding in patient with liver cirrhosis complicated portal hypertension.Methods 86 liver cirrhosis complicated portal hypertension patients accepted examinations including colored Doppler endoscope、hepatia and so on.Contrasted analysis hemorrhage group and non-hemorrhage group's LGV and PV blood Flow dynamics characteristic.Results The LGV had remarkable difference to the liver blood stream direction in the hemorrhage group with the non-hemorrhage group(χ2=12.049,P=0.00),this kind of remarkable difference existed in under the Child graduation three levels of liver function condition.took LGV inside diameter 6 mm,PV inside diameter 16 mm as forecast the esophagus varicosity hemorrhage risk lamination target,the homorrhage group PV inside diameter ≥16 mm to compare the existence remarkable difference with the non-hemorrhage group(χ2=4.21,P=0.04).Conclusion Colored Doppler determines LGV blood stream direction,PV the inside diameter forecast the esophagus varicosity hemorrhage risk has the application value.
Greg P Rogers - One of the best experts on this subject based on the ideXlab platform.
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kane county water resources investigations surface water accounting for water supply planning in kane county
2007Co-Authors: Vernon H Knapp, Amy M Russell, Julie A Kramer, Greg P RogersAbstract:The Kane County Surface Water Accounting Model (KC-SWAM) was developed to provide the Kane County Development and Resources Management Department with a water supply planning tool that describes the effects of water use on availability of Flow Quantity in the Fox River and other streams in the Kane County region. By incorporating algorithms that explain present and past human effects on streamFlow amount, the model is capable of projecting potential Flow changes in upcoming decades based on user-supplied scenarios of water use growth. The model does not simulate sequences of streamFlow amounts associated with individual climatic events, but, instead, estimates the probability of occurrence of present and future streamFlow amounts as affected by various natural and human-induced factors. As a water supply planning tool, the focus of KC-SWAM model preparation and analyses was on low Flows and drought periods. KC-SWAM is an extension of an existing water resources computer model, the Illinois StreamFlow Assessment Model (ILSAM), developed for major watersheds in the Kane County area and other regions of Illinois. In addition to ILSAM capabilities, KC-SWAM has three major functions that improve its use as a water supply planning tool: 1) an interactive map interface assists users in identifying and selecting stream locations and water facilities using point-and-click features; 2) effects of existing water withdrawal and discharge facilities can be modified to simulate future scenarios of water use development; and 3) results of scenarios can be saved, shared with other users, and used as foundations for additional scenario development. Although extensive computer programming code was prepared in KC-SWAM construction, this report focuses on defining hydrologic inputs to the model and on describing factors that affect Flow magnitude of streams in and near the Kane County region. The primary hydrologic data used to develop streamFlow estimates in KC-SWAM include U.S. Geological Survey (USGS) daily streamFlow data, Illinois Environmental Protection Agency (IEPA) wastewater effluent data, and Illinois State Water Survey (ISWS) water use data. The KCSWAM databases contain Flow frequency statistics computed from these hydrologic data, and processed information on effects of major water withdrawals, discharges, and reservoirs. Flow estimates at ungaged stream locations also are based on regional regression equations developed from USGS daily streamFlow data. Low Flows measured by the ISWS during the 2005 drought also were used to calibrate low streamFlow estimates for tributary streams in Kane County. Several factors have definable impacts on Flow availability in the Fox River and other Kane County streams, including 1) climate variability, 2) wastewater discharges, 3) water use withdrawals, and 4) reservoir operation, particularly the operation of Stratton Dam on the Fox River downstream of the Fox Chain of Lakes. Wastewater released to the Fox River in Kane County also has a sizeable effect on low Flows in the river. Although water supply withdrawals at Elgin and Aurora decrease low Flows locally, the collective impact of Kane County’s water use (discharges and withdrawals) increases low Flows in the river. Increases in population growth and expected associated increases in water use likely will magnify the effects of treated wastewater discharged to the Fox River. It is expected that growth in water use will be supplied from various sources yet to be determined, much of it from groundwater, but also with the potential for additional withdrawals from the Fox River. Local effects on low Flows will depend on types of water supply sources being used, and location and magnitude of specific wastewater discharges and river withdrawals. KC-SWAM only identifies potential effects on streamFlow magnitude, not stream water quality, another factor that must be examined when determining practicality of future growth scenarios.
Vernon H Knapp - One of the best experts on this subject based on the ideXlab platform.
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kane county water resources investigations surface water accounting for water supply planning in kane county
2007Co-Authors: Vernon H Knapp, Amy M Russell, Julie A Kramer, Greg P RogersAbstract:The Kane County Surface Water Accounting Model (KC-SWAM) was developed to provide the Kane County Development and Resources Management Department with a water supply planning tool that describes the effects of water use on availability of Flow Quantity in the Fox River and other streams in the Kane County region. By incorporating algorithms that explain present and past human effects on streamFlow amount, the model is capable of projecting potential Flow changes in upcoming decades based on user-supplied scenarios of water use growth. The model does not simulate sequences of streamFlow amounts associated with individual climatic events, but, instead, estimates the probability of occurrence of present and future streamFlow amounts as affected by various natural and human-induced factors. As a water supply planning tool, the focus of KC-SWAM model preparation and analyses was on low Flows and drought periods. KC-SWAM is an extension of an existing water resources computer model, the Illinois StreamFlow Assessment Model (ILSAM), developed for major watersheds in the Kane County area and other regions of Illinois. In addition to ILSAM capabilities, KC-SWAM has three major functions that improve its use as a water supply planning tool: 1) an interactive map interface assists users in identifying and selecting stream locations and water facilities using point-and-click features; 2) effects of existing water withdrawal and discharge facilities can be modified to simulate future scenarios of water use development; and 3) results of scenarios can be saved, shared with other users, and used as foundations for additional scenario development. Although extensive computer programming code was prepared in KC-SWAM construction, this report focuses on defining hydrologic inputs to the model and on describing factors that affect Flow magnitude of streams in and near the Kane County region. The primary hydrologic data used to develop streamFlow estimates in KC-SWAM include U.S. Geological Survey (USGS) daily streamFlow data, Illinois Environmental Protection Agency (IEPA) wastewater effluent data, and Illinois State Water Survey (ISWS) water use data. The KCSWAM databases contain Flow frequency statistics computed from these hydrologic data, and processed information on effects of major water withdrawals, discharges, and reservoirs. Flow estimates at ungaged stream locations also are based on regional regression equations developed from USGS daily streamFlow data. Low Flows measured by the ISWS during the 2005 drought also were used to calibrate low streamFlow estimates for tributary streams in Kane County. Several factors have definable impacts on Flow availability in the Fox River and other Kane County streams, including 1) climate variability, 2) wastewater discharges, 3) water use withdrawals, and 4) reservoir operation, particularly the operation of Stratton Dam on the Fox River downstream of the Fox Chain of Lakes. Wastewater released to the Fox River in Kane County also has a sizeable effect on low Flows in the river. Although water supply withdrawals at Elgin and Aurora decrease low Flows locally, the collective impact of Kane County’s water use (discharges and withdrawals) increases low Flows in the river. Increases in population growth and expected associated increases in water use likely will magnify the effects of treated wastewater discharged to the Fox River. It is expected that growth in water use will be supplied from various sources yet to be determined, much of it from groundwater, but also with the potential for additional withdrawals from the Fox River. Local effects on low Flows will depend on types of water supply sources being used, and location and magnitude of specific wastewater discharges and river withdrawals. KC-SWAM only identifies potential effects on streamFlow magnitude, not stream water quality, another factor that must be examined when determining practicality of future growth scenarios.