In order to study the temperature simulation of berry slices in microwave vacuum puffing process, numerical simulation method was used to simulate the temperature in different time according to theoretical calculation...In order to study the temperature simulation of berry slices in microwave vacuum puffing process, numerical simulation method was used to simulate the temperature in different time according to theoretical calculation result and the deviation had been verificated throughout the experiment. The better uniform of temperature between experiment and simulation could be concluded except in the period of rapid temperature increase. The temperature reached the high point of 130.25℃ in the middle point of slices at 100 s, while the temperature was over 50℃ in external parts of slices for the reason of thermal diffusion. Conclusions could be drawn that the model was effective and numerical analysis could simulate the temperature simulation for berry leather in microwave vacuum puffing process.展开更多
The gas puffing performance plays a key role in repeatable discharges in the Sino- UNited Spherical Tokamak （SUNIST） experiments. In this paper, temporal evolution of the gas pressure in the vacuum vessel and the de...The gas puffing performance plays a key role in repeatable discharges in the Sino- UNited Spherical Tokamak （SUNIST） experiments. In this paper, temporal evolution of the gas pressure in the vacuum vessel and the dependence of the repeatability of plasma discharges on different timing arrangements between the gas puffing pulse and the Ohmic field have been experimentally investigated. The results show that, after a fast rising phase, the gas pressure becomes quasi-stationary. In the regime of the discharges being started up when the gas pressure has already reached the quasi-stationary state for about 37 ms, an improved repeatability of the plasma discharges is achieved.展开更多
The past literature on the use of vegetable oils as fuel in diesel engine revealed that utilizing vegetable oil fuels in diesel engines may require property changes in the oil or perhaps, some minor engine modificatio...The past literature on the use of vegetable oils as fuel in diesel engine revealed that utilizing vegetable oil fuels in diesel engines may require property changes in the oil or perhaps, some minor engine modifications or operating changes. This study was conducted to search for the effect of atmospheric oxygen on the puffing and bursting phenomena that occur during vegetable oils droplet vaporization process in their use as fuel in diesel engine. The fiber-suspended droplet technique was used, and the normalized square droplet diameter as well as the temperature evolution vicinity the droplet was analyzed. The results show that puffing and bursting phenomena highly depend on oxygen. In presence of atmospheric oxygen, there is an increase of the puffing and bursting intensity and therefore the evaporation rate of the vegetable oil droplets, but in an inert environment or when the environment is oxygen-depleted puffing and bursting phenomena disappearing and make place of a series of explosions with lower magnitude. The lack of oxygen reduces the thermal degradation, polymerization and oxidation reactions and consequently the vaporization rate of vegetable oils droplets;and could therefore lead to the formation of deposits in the form of polymers. This is unsuitable for their use as a fuel in diesel engines. It can also be concluded that atmospheric oxygen has some positive effects on engine performance and emissions when operating with vegetable oil. These results help to address the challenge for the use of alternative fuels such as non-edible vegetable oils.展开更多
Modeling with OEDGE was carried out to assess the initial and long-term plasma contamination efficiency of Ar puffing from different divertor locations, i.e. the inner divertor, the outer divertor and the dome, in the...Modeling with OEDGE was carried out to assess the initial and long-term plasma contamination efficiency of Ar puffing from different divertor locations, i.e. the inner divertor, the outer divertor and the dome, in the EAST superconducting tokamak for typical ohmic plasma conditions. It was found that the initial Ar contamination efficiency is dependent on the local plasma conditions at the different gas puff locations. However, it quickly approaches a similar steady state value for Ar recycling efficiency >0.9. OEDGE modeling shows that the final equilibrium Ar contamination efficiency is significantly lower for the more closed lower divertor than that for the upper divertor.展开更多
In the HL-2A 2004 experiment campaign, pulsed molecular beam injection （MBI） and strong hydrogen gas puffing under the divertor configuration were used for gas fueling. The experimental results show that the MBI of ...In the HL-2A 2004 experiment campaign, pulsed molecular beam injection （MBI） and strong hydrogen gas puffing under the divertor configuration were used for gas fueling. The experimental results show that the MBI of hydrogen can reduce the heat flux to the divertor target plate. The electron temperature measured by the Langmuir probe array decreases significantly during the injection of the molecular beam whereas the electron density increases. This indicates that the plasma pressure near the target plates tends to be constant at a new equilibrium level. In the divertor plasmas with strong hydrogen gas puffing a high plasma density up to 4.4 × 10^19 m^-3 was achieved. In addition, a phenomenon similar to the partially detached divertor regime was observed, which is being studied in open divertor tokamaks such as DIII-D to reduce the peak heat flux on the target plates near the separatrix. After a strong gas puffing the electron temperature measured on the outer divertor target plate near the separatrix decreases till below 5 eV or even lower, but that of the farther outer divertor target plate does not change obviously; and the CIII and the Ha emissions at the plasma edge decrease as expected, but the Ha emission near the Xpoint increases. These results reflects some interesting characteristics, which needs to be studied by further modeling and experiments.展开更多
In order to reveal the mechanism of microwave puffing berry snack, a center combination experiment method was employed to explore the puffing process of blueberry snacks. Blueberry as the raw material, the microwave p...In order to reveal the mechanism of microwave puffing berry snack, a center combination experiment method was employed to explore the puffing process of blueberry snacks. Blueberry as the raw material, the microwave power, initial moisture content, puffing time and mass were employed as experimental factors. The pressure, temperature, amount of water vapor and puffing properties in terms of the volume, hardness and brittleness were employed as target parameters. The higher microwave intensity and initial moisture content resulted in the more amount of water vapor in the snacks and more holes in the appropriate puffing time. The shape and structure of the snacks tended to be stable with the removal of moisture.展开更多
One of the critical issues to be solved for HL-2M is the power exhaust.Divertor target plate geometry strongly influences the plasma profiles by controlling the neutral recycling pattern,which in turn has a strong eff...One of the critical issues to be solved for HL-2M is the power exhaust.Divertor target plate geometry strongly influences the plasma profiles by controlling the neutral recycling pattern,which in turn has a strong effect on the symmetry and stability of the divertor plasma and finally on the whole edge region.The numerical simulation SOLPS5.0 package is used to design and explore the divertor target plates for HL-2M.We start with the choice of a proper target plate geometry,which has a smaller incidence angle in the permissible space,and then discuss the method of gas puffing to reduce the heat flux density on the target and the effects of gas puffing on the divertor plasma performance.展开更多
The design of the pumping stations and the gas injection systems for the inner Chamber and the cryostat on HT-7U superconducting tokamak is described in this paper.
Due to its high-temperature and high-pressure operating environment,food/feed puffing machines are prone to faults such as cavity blockage and cutter wear.This paper presents the design of a fault diagnosis system for...Due to its high-temperature and high-pressure operating environment,food/feed puffing machines are prone to faults such as cavity blockage and cutter wear.This paper presents the design of a fault diagnosis system for puffing machines(food/feed processing equipment that expands or puffs agricultural products),based on a convolutional neural network and a multi-head attention mechanism model,which incorporates Bayesian optimization.The system combines multi-source information fusion,capturing patterns and characteristics associated with fault states by monitoring various sources of information,such as temperature,noise signals,main motor current and vibration signals from key components.Hyperparameters are optimized through Bayesian optimization to obtain the optimal parameter model.The integration of convolutional neural networks and multi-head attention mechanisms enables the simultaneous capture of both local and global information,thereby enhancing data comprehension.Experimental results demonstrate that the system successfully diagnoses puffing machine faults,achieving an average recognition accuracy of 98.8%across various operating conditions,highlighting its high accuracy,generalization ability and robustness.展开更多
Microwave technology is fit for the processing of berry products,but it may affect nutrition components of berry fruit.To improve the nutritional value of the berry products,the influences of microwave vacuum puffing ...Microwave technology is fit for the processing of berry products,but it may affect nutrition components of berry fruit.To improve the nutritional value of the berry products,the influences of microwave vacuum puffing conditions on the anthocyanin content of raspberry snack were investigated using central composite experiments.Results indicated that vacuum pressure had the most significant effect on the anthocyanins of berry snack,followed by the puffing time,microwave power,and initial moisture content.The interaction between microwave power and puffing time on the anthocyanins was extremely significant.Under microwave power of 2.68 kW and the puffing time of 81.00 s,the anthocyanin content of raspberry snack was retained at high level.The results can provide some technological basis for the berry fruit products processed with high quality.展开更多
Foreign diplomats in Beijing hit the road in a solidarity fun run for the Olympics It was a day out of the office for Philippe le Gall.Clad in a baggy white T-shirt and black miming shorts,the Seychelles’ ambassador ...Foreign diplomats in Beijing hit the road in a solidarity fun run for the Olympics It was a day out of the office for Philippe le Gall.Clad in a baggy white T-shirt and black miming shorts,the Seychelles’ ambassador to China looked ready for action. Le Gall was running a 1-kin race in a villa complex in northeast Beijing,where the Slovenian Embassy is located.The race, hosted by the embassy on April 26,104 days before the opening of the Beijing Olympics, attracted diplomats from about 50 countries. Its theme was"diplomats running for peace and friendship."展开更多
Designing and constructing bifunctional electrocatalysts with high efficiency,high stability and low cost for overall water splitting to produce clean hydrogen fuel is attractive but highly challenging.Here we constru...Designing and constructing bifunctional electrocatalysts with high efficiency,high stability and low cost for overall water splitting to produce clean hydrogen fuel is attractive but highly challenging.Here we constructed puffed quaternary FexCoyNi1-x-yP nanoarrays as bifunctional electrodes for robust overall water splitting.The iron was used as the modulator to manipulate the electron density of NiCoP nanoarray,which could increase the positive charges of metal(Ni and Co)and P sites.The resultant electronic structure of FexCoyNi1-x-yP was supposed to balance the adsorption and desorption of H and accelerate the oxygen evolution reaction(OER)kinetics.Moreover,the morphological structure of FexCoyNi1-x-yP was modulated through the kinetically controlled alkaline etching by using the amphoteric features of initial FeCoNi hydroxide nanowires.The resultant puffed structure has rich porosity,cavity and defects,which benefit the exposure of more active sites and the transport of mass/charge.As a result,the cell integrated with the puffed quaternary FexCoyNi1-x-yP nanoarrays as both the cathode and anode only requires the overpotentials of 25 and 230 mV for hydrogen evolution reaction(HER)and OER at the current density of 10 mA cm^-2 in alkaline media and a cell voltage of 1.48 V to drive the overall water splitting.Moreover,the puffed FexCoyNi1-x-yP demonstrates remarkable durability for continuous electrolysis even at a large current density of 240 mA cm^-2.展开更多
基金Supported by the Key Project of Education Department of Heilongjiang Province of China (12521z003)the National Natural Science Foundation of China (31071579)the Key Program of the Natural Science Foundation of Heilongjiang Province of China (ZD201013)
文摘In order to study the temperature simulation of berry slices in microwave vacuum puffing process, numerical simulation method was used to simulate the temperature in different time according to theoretical calculation result and the deviation had been verificated throughout the experiment. The better uniform of temperature between experiment and simulation could be concluded except in the period of rapid temperature increase. The temperature reached the high point of 130.25℃ in the middle point of slices at 100 s, while the temperature was over 50℃ in external parts of slices for the reason of thermal diffusion. Conclusions could be drawn that the model was effective and numerical analysis could simulate the temperature simulation for berry leather in microwave vacuum puffing process.
基金supported by National Natural Science Foundation of China(Nos.10990214,11175103,11261140327 and 11075092)Ministry of Science and Technology(MOST)of China(Nos.2013GB112001 and 2010GB107002)Tsinghua University Initiative Scientific Research Program
文摘The gas puffing performance plays a key role in repeatable discharges in the Sino- UNited Spherical Tokamak （SUNIST） experiments. In this paper, temporal evolution of the gas pressure in the vacuum vessel and the dependence of the repeatability of plasma discharges on different timing arrangements between the gas puffing pulse and the Ohmic field have been experimentally investigated. The results show that, after a fast rising phase, the gas pressure becomes quasi-stationary. In the regime of the discharges being started up when the gas pressure has already reached the quasi-stationary state for about 37 ms, an improved repeatability of the plasma discharges is achieved.
文摘The past literature on the use of vegetable oils as fuel in diesel engine revealed that utilizing vegetable oil fuels in diesel engines may require property changes in the oil or perhaps, some minor engine modifications or operating changes. This study was conducted to search for the effect of atmospheric oxygen on the puffing and bursting phenomena that occur during vegetable oils droplet vaporization process in their use as fuel in diesel engine. The fiber-suspended droplet technique was used, and the normalized square droplet diameter as well as the temperature evolution vicinity the droplet was analyzed. The results show that puffing and bursting phenomena highly depend on oxygen. In presence of atmospheric oxygen, there is an increase of the puffing and bursting intensity and therefore the evaporation rate of the vegetable oil droplets, but in an inert environment or when the environment is oxygen-depleted puffing and bursting phenomena disappearing and make place of a series of explosions with lower magnitude. The lack of oxygen reduces the thermal degradation, polymerization and oxidation reactions and consequently the vaporization rate of vegetable oils droplets;and could therefore lead to the formation of deposits in the form of polymers. This is unsuitable for their use as a fuel in diesel engines. It can also be concluded that atmospheric oxygen has some positive effects on engine performance and emissions when operating with vegetable oil. These results help to address the challenge for the use of alternative fuels such as non-edible vegetable oils.
基金supported by the National Magnetic Confinement Fusion Science Program of China under Contract Nos. 2013GB107003, 2014GB124006, 2015GB101000National Natural Science Foundation of China under Grant Nos. 11275231, 11422546, 11575236, 11575244 and 11405213+2 种基金Scientific Research Grant of Hefei Science Center of CAS under contract 2015SRG-HSC001 and 2015SRGHSC008Magnetic Confinement Innovation Team Plan of Chinese Academy of Sciencesthe Thousand Talent Plan of China
文摘Modeling with OEDGE was carried out to assess the initial and long-term plasma contamination efficiency of Ar puffing from different divertor locations, i.e. the inner divertor, the outer divertor and the dome, in the EAST superconducting tokamak for typical ohmic plasma conditions. It was found that the initial Ar contamination efficiency is dependent on the local plasma conditions at the different gas puff locations. However, it quickly approaches a similar steady state value for Ar recycling efficiency >0.9. OEDGE modeling shows that the final equilibrium Ar contamination efficiency is significantly lower for the more closed lower divertor than that for the upper divertor.
基金supported in part by the JSPS-CAS Core University Program in the field of Plasma and Nuclear Fusion
文摘In the HL-2A 2004 experiment campaign, pulsed molecular beam injection （MBI） and strong hydrogen gas puffing under the divertor configuration were used for gas fueling. The experimental results show that the MBI of hydrogen can reduce the heat flux to the divertor target plate. The electron temperature measured by the Langmuir probe array decreases significantly during the injection of the molecular beam whereas the electron density increases. This indicates that the plasma pressure near the target plates tends to be constant at a new equilibrium level. In the divertor plasmas with strong hydrogen gas puffing a high plasma density up to 4.4 × 10^19 m^-3 was achieved. In addition, a phenomenon similar to the partially detached divertor regime was observed, which is being studied in open divertor tokamaks such as DIII-D to reduce the peak heat flux on the target plates near the separatrix. After a strong gas puffing the electron temperature measured on the outer divertor target plate near the separatrix decreases till below 5 eV or even lower, but that of the farther outer divertor target plate does not change obviously; and the CIII and the Ha emissions at the plasma edge decrease as expected, but the Ha emission near the Xpoint increases. These results reflects some interesting characteristics, which needs to be studied by further modeling and experiments.
基金Supported by National Natural Science Foundation of China(31571848)
文摘In order to reveal the mechanism of microwave puffing berry snack, a center combination experiment method was employed to explore the puffing process of blueberry snacks. Blueberry as the raw material, the microwave power, initial moisture content, puffing time and mass were employed as experimental factors. The pressure, temperature, amount of water vapor and puffing properties in terms of the volume, hardness and brittleness were employed as target parameters. The higher microwave intensity and initial moisture content resulted in the more amount of water vapor in the snacks and more holes in the appropriate puffing time. The shape and structure of the snacks tended to be stable with the removal of moisture.
基金supported by the National Magnetic Confinement Fusion Science Program of China(No.2009GB104008)National Natural Science Foundation of China(Nos.10975048,11175061)
文摘One of the critical issues to be solved for HL-2M is the power exhaust.Divertor target plate geometry strongly influences the plasma profiles by controlling the neutral recycling pattern,which in turn has a strong effect on the symmetry and stability of the divertor plasma and finally on the whole edge region.The numerical simulation SOLPS5.0 package is used to design and explore the divertor target plates for HL-2M.We start with the choice of a proper target plate geometry,which has a smaller incidence angle in the permissible space,and then discuss the method of gas puffing to reduce the heat flux density on the target and the effects of gas puffing on the divertor plasma performance.
文摘The design of the pumping stations and the gas injection systems for the inner Chamber and the cryostat on HT-7U superconducting tokamak is described in this paper.
基金sponsored by the Belt and Road Innovative Cooperation Project(BZ2022003).
文摘Due to its high-temperature and high-pressure operating environment,food/feed puffing machines are prone to faults such as cavity blockage and cutter wear.This paper presents the design of a fault diagnosis system for puffing machines(food/feed processing equipment that expands or puffs agricultural products),based on a convolutional neural network and a multi-head attention mechanism model,which incorporates Bayesian optimization.The system combines multi-source information fusion,capturing patterns and characteristics associated with fault states by monitoring various sources of information,such as temperature,noise signals,main motor current and vibration signals from key components.Hyperparameters are optimized through Bayesian optimization to obtain the optimal parameter model.The integration of convolutional neural networks and multi-head attention mechanisms enables the simultaneous capture of both local and global information,thereby enhancing data comprehension.Experimental results demonstrate that the system successfully diagnoses puffing machine faults,achieving an average recognition accuracy of 98.8%across various operating conditions,highlighting its high accuracy,generalization ability and robustness.
基金The authors thank the financial support by the National Natural Science Foundation of China(No.31071579&31271911)the Key Program of the Natural Science Foundation of Heilongjiang Province of China(No.ZD201013)Key Project of Education Department of Heilongjiang Province of China(No.12521z003)for this research project.
文摘Microwave technology is fit for the processing of berry products,but it may affect nutrition components of berry fruit.To improve the nutritional value of the berry products,the influences of microwave vacuum puffing conditions on the anthocyanin content of raspberry snack were investigated using central composite experiments.Results indicated that vacuum pressure had the most significant effect on the anthocyanins of berry snack,followed by the puffing time,microwave power,and initial moisture content.The interaction between microwave power and puffing time on the anthocyanins was extremely significant.Under microwave power of 2.68 kW and the puffing time of 81.00 s,the anthocyanin content of raspberry snack was retained at high level.The results can provide some technological basis for the berry fruit products processed with high quality.
文摘Foreign diplomats in Beijing hit the road in a solidarity fun run for the Olympics It was a day out of the office for Philippe le Gall.Clad in a baggy white T-shirt and black miming shorts,the Seychelles’ ambassador to China looked ready for action. Le Gall was running a 1-kin race in a villa complex in northeast Beijing,where the Slovenian Embassy is located.The race, hosted by the embassy on April 26,104 days before the opening of the Beijing Olympics, attracted diplomats from about 50 countries. Its theme was"diplomats running for peace and friendship."
基金This work was supported by the National Key Research and Development Program of China(2017YFB0405400)Shandong Provincial Natural Science Foundation(ZR2019BB025,2018YFJH0503 and ZR2018ZC0842)the Joint Fund of the National Natural Science Foundation Committee of China Academy of Engineering Physics(U1530401).
文摘Designing and constructing bifunctional electrocatalysts with high efficiency,high stability and low cost for overall water splitting to produce clean hydrogen fuel is attractive but highly challenging.Here we constructed puffed quaternary FexCoyNi1-x-yP nanoarrays as bifunctional electrodes for robust overall water splitting.The iron was used as the modulator to manipulate the electron density of NiCoP nanoarray,which could increase the positive charges of metal(Ni and Co)and P sites.The resultant electronic structure of FexCoyNi1-x-yP was supposed to balance the adsorption and desorption of H and accelerate the oxygen evolution reaction(OER)kinetics.Moreover,the morphological structure of FexCoyNi1-x-yP was modulated through the kinetically controlled alkaline etching by using the amphoteric features of initial FeCoNi hydroxide nanowires.The resultant puffed structure has rich porosity,cavity and defects,which benefit the exposure of more active sites and the transport of mass/charge.As a result,the cell integrated with the puffed quaternary FexCoyNi1-x-yP nanoarrays as both the cathode and anode only requires the overpotentials of 25 and 230 mV for hydrogen evolution reaction(HER)and OER at the current density of 10 mA cm^-2 in alkaline media and a cell voltage of 1.48 V to drive the overall water splitting.Moreover,the puffed FexCoyNi1-x-yP demonstrates remarkable durability for continuous electrolysis even at a large current density of 240 mA cm^-2.
