The Experts below are selected from a list of 83895 Experts worldwide ranked by ideXlab platform
K H Norian - One of the best experts on this subject based on the ideXlab platform.
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equivalent circuit components of nickel cadmium battery at different states of charge
Journal of Power Sources, 2011Co-Authors: K H NorianAbstract:Abstract Equations that describe the voltage variations with time of a rechargeable battery during charging and discharging were used to determine the component values of the equivalent circuit of nickel–cadmium batteries under different states of charge (SOC). The equivalent circuit of the battery was described as an ideal voltage source in series with a resistor and the Parallel Combination of a resistor and a capacitor. The battery model used different values of resistance and capacitance, in the Parallel Combination, during the different phases of the discharge-rest–charge-rest sequence. The results show that the series resistance is approximately constant with variations in the SOC while the resistor in the Parallel RC circuit increases as the SOC decreases. For the discharge and charge phases the capacitor value increased and decreased, respectively, as the SOC decreased. The value of the resistor or capacitor in the Parallel RC circuit is an indicator of the battery SOC.
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equivalent circuit components of nickel cadmium battery at different states of charge
Journal of Power Sources, 2011Co-Authors: K H NorianAbstract:Abstract Equations that describe the voltage variations with time of a rechargeable battery during charging and discharging were used to determine the component values of the equivalent circuit of nickel–cadmium batteries under different states of charge (SOC). The equivalent circuit of the battery was described as an ideal voltage source in series with a resistor and the Parallel Combination of a resistor and a capacitor. The battery model used different values of resistance and capacitance, in the Parallel Combination, during the different phases of the discharge-rest–charge-rest sequence. The results show that the series resistance is approximately constant with variations in the SOC while the resistor in the Parallel RC circuit increases as the SOC decreases. For the discharge and charge phases the capacitor value increased and decreased, respectively, as the SOC decreased. The value of the resistor or capacitor in the Parallel RC circuit is an indicator of the battery SOC.
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transient boundary voltage method for measurement of equivalent circuit components of rechargeable batteries
Journal of Power Sources, 2011Co-Authors: K H NorianAbstract:Abstract A method is presented for measuring the equivalent circuit components of rechargeable batteries. The temporal discharge–rest–charge–rest sequence of a rechargeable battery is described, using the principles of transient circuit analysis, to derive equations for the battery voltage as a function of time during voltage transients and at the boundaries at transitions between transient phases. The equations lead to a new measurement method for battery characterization. The equivalent circuit of the battery is described as an ideal voltage source in series with a resistor and the Parallel Combination of a resistor and a capacitor. The battery model uses different values of resistance and capacitance, in the Parallel Combination, during the different phases of the discharge–rest–charge–rest sequence. The method is used to measure the circuit parameters of a nickel–cadmium battery.
Sheela Berchmans - One of the best experts on this subject based on the ideXlab platform.
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an epidermal alkaline rechargeable ag zn printable tattoo battery for wearable electronics
Journal of Materials Chemistry, 2014Co-Authors: Sheela Berchmans, Amay J Bandodkar, Julian Ramirez, Ying Shirley Meng, Joseph WangAbstract:Herein we report for the first time the fabrication of a rechargeable, benign, skin-worn Ag–Zn tattoo battery using unconventional materials, such as screen printed electrodes, temporary tattoo paper, alkaline gel electrolytes and a PDMS cover for sealing the battery. The tattoo battery can be easily worn by a person for powering wearable devices. Detailed characterization of a typical Ag–Zn tattoo cell reveals a capacity density in the range 1.3–2.1 mA h cm−2 and stability up to 13 cycles. The tattoo cell exhibits a stable open circuit voltage of 1.5 V over a 5 days period and endures repeated stretching and bending strain cycles with minimal decrement in its performance. The lateral arrangement of the negative and positive electrodes allows the integration of several cells into a battery in series or Parallel Combination for tuning the discharge capacity and voltage to the desired values. The practical nature of the tattoo battery was illustrated by applying it to a human subject's skin followed by lighting a red LED. The epidermal tattoo battery thus meets the demands of wearable power sources, including mechanical compliance and tunable discharge capacity, to power body-worn electronic devices.
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An epidermal alkaline rechargeable Ag–Zn printable tattoo battery for wearable electronics
Journal of Materials Chemistry, 2014Co-Authors: Sheela Berchmans, Amay J Bandodkar, Julian Ramirez, Ying Shirley Meng, Wenzhao Jia, Joseph WangAbstract:Herein we report for the first time the fabrication of a rechargeable, benign, skin-worn Ag–Zn tattoo battery using unconventional materials, such as screen printed electrodes, temporary tattoo paper, alkaline gel electrolytes and a PDMS cover for sealing the battery. The tattoo battery can be easily worn by a person for powering wearable devices. Detailed characterization of a typical Ag–Zn tattoo cell reveals a capacity density in the range 1.3–2.1 mA h cm−2 and stability up to 13 cycles. The tattoo cell exhibits a stable open circuit voltage of 1.5 V over a 5 days period and endures repeated stretching and bending strain cycles with minimal decrement in its performance. The lateral arrangement of the negative and positive electrodes allows the integration of several cells into a battery in series or Parallel Combination for tuning the discharge capacity and voltage to the desired values. The practical nature of the tattoo battery was illustrated by applying it to a human subject's skin followed by lighting a red LED. The epidermal tattoo battery thus meets the demands of wearable power sources, including mechanical compliance and tunable discharge capacity, to power body-worn electronic devices.
Joseph Wang - One of the best experts on this subject based on the ideXlab platform.
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an epidermal alkaline rechargeable ag zn printable tattoo battery for wearable electronics
Journal of Materials Chemistry, 2014Co-Authors: Sheela Berchmans, Amay J Bandodkar, Julian Ramirez, Ying Shirley Meng, Joseph WangAbstract:Herein we report for the first time the fabrication of a rechargeable, benign, skin-worn Ag–Zn tattoo battery using unconventional materials, such as screen printed electrodes, temporary tattoo paper, alkaline gel electrolytes and a PDMS cover for sealing the battery. The tattoo battery can be easily worn by a person for powering wearable devices. Detailed characterization of a typical Ag–Zn tattoo cell reveals a capacity density in the range 1.3–2.1 mA h cm−2 and stability up to 13 cycles. The tattoo cell exhibits a stable open circuit voltage of 1.5 V over a 5 days period and endures repeated stretching and bending strain cycles with minimal decrement in its performance. The lateral arrangement of the negative and positive electrodes allows the integration of several cells into a battery in series or Parallel Combination for tuning the discharge capacity and voltage to the desired values. The practical nature of the tattoo battery was illustrated by applying it to a human subject's skin followed by lighting a red LED. The epidermal tattoo battery thus meets the demands of wearable power sources, including mechanical compliance and tunable discharge capacity, to power body-worn electronic devices.
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An epidermal alkaline rechargeable Ag–Zn printable tattoo battery for wearable electronics
Journal of Materials Chemistry, 2014Co-Authors: Sheela Berchmans, Amay J Bandodkar, Julian Ramirez, Ying Shirley Meng, Wenzhao Jia, Joseph WangAbstract:Herein we report for the first time the fabrication of a rechargeable, benign, skin-worn Ag–Zn tattoo battery using unconventional materials, such as screen printed electrodes, temporary tattoo paper, alkaline gel electrolytes and a PDMS cover for sealing the battery. The tattoo battery can be easily worn by a person for powering wearable devices. Detailed characterization of a typical Ag–Zn tattoo cell reveals a capacity density in the range 1.3–2.1 mA h cm−2 and stability up to 13 cycles. The tattoo cell exhibits a stable open circuit voltage of 1.5 V over a 5 days period and endures repeated stretching and bending strain cycles with minimal decrement in its performance. The lateral arrangement of the negative and positive electrodes allows the integration of several cells into a battery in series or Parallel Combination for tuning the discharge capacity and voltage to the desired values. The practical nature of the tattoo battery was illustrated by applying it to a human subject's skin followed by lighting a red LED. The epidermal tattoo battery thus meets the demands of wearable power sources, including mechanical compliance and tunable discharge capacity, to power body-worn electronic devices.
Chen Ping - One of the best experts on this subject based on the ideXlab platform.
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experimental investigation into the performance of heat pipe with micro grooves fabricated by extrusion ploughing process
Energy Conversion and Management, 2010Co-Authors: Tang Yong, Chen Ping, Wang XiaowuAbstract:Abstract Heat pipe with groove--shaped capillary structure always shows smaller heat transfer limit. It is because that traditional fabrication technique leads to the difficulty in minimizing the geometric dimension of grooves. As a result, novel fabrication technique is of great importance. In this paper, we will discuss some heat transfer characteristics of heat pipe fabricated by novel Extrusion–ploughing process. Owing to the extrusion from tools in the fabrication course, two kinds of grooves, namely leading grooves and secondary grooves, are formed in this kind of heat pipe. This feature will polish the groove geometric structure. Furthermore, considering the fact of Parallel Combination of these two kinds of grooves, excellent heat transfer performance of novel heat pipe fabricated by novel Extrusion–ploughing process can be expected. The experiments of testing temperature changes versus time at evaporator sector and condenser sector at different work temperature are conducted. The temperature distribution along axial direction of this kind of novel heat pipe at its steady stage is also tested. The experimental results prove that the heat pipe fabricated by Extrusion–ploughing process exhibits ideal isothermal performance and excellent heat respond speed. When compared with normal axially grooved heat pipe, this novel kind of heat pipe also shows larger final heat transfer limit.
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investigation into performance of a heat pipe with micro grooves fabricated by extrusion ploughing process
Energy Conversion and Management, 2009Co-Authors: Xiaowu Wang, Tang Yong, Chen PingAbstract:Abstract Constrained by the micro geometry structure, a heat pipe with groove shaped capillary structure fabricated by the traditional method always shows smaller heat transfer limits. To solve this, a novel fabrication technique is of great importance. In this paper, we will discuss about heat pipes fabricated by a novel extrusion–ploughing process. Because of the extrusion from tools, two kinds of grooves, namely a leading groove and a secondary groove, are formed in this kind of heat pipe. This feature will polish the geometry structure of an ordinary heat pipe. Considering the fact of the Parallel Combination of these two kinds of grooves, improvement on the heat transfer performance can be expected. By experiments, the empirical mathematical regression equations relating the fabrication parameter to the geometry groove dimensions and the theoretical calculation of heat transfer limits are established here. The results show the heat pipe fabricated by the extrusion–ploughing process exhibits larger heat transfer limits when the work temperature ranges from 340 to 390 K.
Tang Yong - One of the best experts on this subject based on the ideXlab platform.
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experimental investigation into the performance of heat pipe with micro grooves fabricated by extrusion ploughing process
Energy Conversion and Management, 2010Co-Authors: Tang Yong, Chen Ping, Wang XiaowuAbstract:Abstract Heat pipe with groove--shaped capillary structure always shows smaller heat transfer limit. It is because that traditional fabrication technique leads to the difficulty in minimizing the geometric dimension of grooves. As a result, novel fabrication technique is of great importance. In this paper, we will discuss some heat transfer characteristics of heat pipe fabricated by novel Extrusion–ploughing process. Owing to the extrusion from tools in the fabrication course, two kinds of grooves, namely leading grooves and secondary grooves, are formed in this kind of heat pipe. This feature will polish the groove geometric structure. Furthermore, considering the fact of Parallel Combination of these two kinds of grooves, excellent heat transfer performance of novel heat pipe fabricated by novel Extrusion–ploughing process can be expected. The experiments of testing temperature changes versus time at evaporator sector and condenser sector at different work temperature are conducted. The temperature distribution along axial direction of this kind of novel heat pipe at its steady stage is also tested. The experimental results prove that the heat pipe fabricated by Extrusion–ploughing process exhibits ideal isothermal performance and excellent heat respond speed. When compared with normal axially grooved heat pipe, this novel kind of heat pipe also shows larger final heat transfer limit.
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investigation into performance of a heat pipe with micro grooves fabricated by extrusion ploughing process
Energy Conversion and Management, 2009Co-Authors: Xiaowu Wang, Tang Yong, Chen PingAbstract:Abstract Constrained by the micro geometry structure, a heat pipe with groove shaped capillary structure fabricated by the traditional method always shows smaller heat transfer limits. To solve this, a novel fabrication technique is of great importance. In this paper, we will discuss about heat pipes fabricated by a novel extrusion–ploughing process. Because of the extrusion from tools, two kinds of grooves, namely a leading groove and a secondary groove, are formed in this kind of heat pipe. This feature will polish the geometry structure of an ordinary heat pipe. Considering the fact of the Parallel Combination of these two kinds of grooves, improvement on the heat transfer performance can be expected. By experiments, the empirical mathematical regression equations relating the fabrication parameter to the geometry groove dimensions and the theoretical calculation of heat transfer limits are established here. The results show the heat pipe fabricated by the extrusion–ploughing process exhibits larger heat transfer limits when the work temperature ranges from 340 to 390 K.
