This document summarizes an experiment to determine the thermodynamic parameters (ΔG, K, ΔS, ΔH) of reactions in an alkaline-manganese dioxide (AA Duracell) battery. The ΔG was calculated to be -303.4±0.2 kJ/mol. K was measured to be 3.7×10^53 ± 3.7×10^50. ΔS was calculated to be -23.0±0.01 J/Kmol. ΔH was experimentally determined to be 310.3±0.4 kJ/mol, which was within 0.55% of the theoretical value calculated from formation energies. Errors may have arisen from measuring external rather
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Innovation, research, learning processes and transitions towards agroecologyExternalEvents
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Design of Primary & auxiliary equipment of Diethyl ether production plant. Process & mechanical design of Reactor, Heat exchanger, Distillation column.
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Perceptions of smes (manufacturing firms) towards the key elements of tqmeSAT Journals
Abstract Total Quality Management is a widely used approach for various reasons. In addition to the ISO 9001 certification TQM is considered to be the next step towards the journey of zero defects The race of quality management is initiated by the large scale companies with professional approach and with the available funds and infrastructure to meet with the challenges of present competitive environment. However the SMEs also in order to grab the opportunities prevailing and to increase the life span of their organizations are joining the band wagon of Quality as a strategy. There are several key elements of TQM. The awareness about these different elements of TQM is however a question mark. This research paper is indicating with a survey of a small sample of SMEs about the level of awareness and the importance they feel about the elements of TQM. It was observed that very few SMEs were inclined to go beyond ISO9001. However those SMEs which were following TQM principles were more or less aware about the prompted key elements. Further it was found that there is maximum awareness about the continuous improvement. Process management, House Keeping and Quality chain (Customer – Supplier relationship) are also considered to be important ones for the success of TQM implementation. These were followed by Team working & Synergy, Employee Empowerment, Bench Marking, Creativity & Innovation. Kaizen seems to be the element which SMEs are not much aware about. Keywords: TQM, ISO9001, SMEs, Process Management, Quality Chain, Synergy, Bench Marking
Presentación del Sr. Jorge Samaniego, en el marco del Taller Regional de Expertos: Promoviendo Sistemas Agroalimentarios Sostenibles: Análisis de Avances de los Programas de Compras Públicas de la Agricultura Familiar en ALC, realizado el 6 y 7 de diciembre de 2016.
Presentación del Taller Regional de Expertos – Promoviendo Sistemas Agroalime...FAO
Presentación de la Sra. Emma Siliprandi, en el marco del Taller Regional de Expertos: Promoviendo Sistemas Agroalimentarios Sostenibles: Análisis de Avances de los Programas de Compras Públicas de la Agricultura Familiar en ALC, realizado el 6 y 7 de diciembre de 2016.
The experience of the global network against food crises for strengthening resilience.
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EU, WFP and FAO are also promoting the "Global Network against Food Crises", a platform for consensus building on technical analysis and coordination of response.
Bed bugs have spread prolifically in recent years, and as public buildings, libraries can be especially vulnerable. The internet is full of suggestions and remedies on how to kill bed bugs, but there are only a few select ways of being sure they have been fully eradicated. In this webinar, you’ll learn about prevention techniques and treatments that are safe for your collections.
김경환 법무법인 민후 대표변호사는 2016년 12월 9일 국회에서 열린 '미래혁명 자율주행시대 해법은?'을 주제로 한 국회미래자동차포럼에서 '자율주행차 사회의 법적 과제'에 대해 발제하였습니다.
슬라이드는 우리나라법과 미국 캘리포니아주의 자율주행차 관련 입법 현황과 자율주행차의 정의 등을 시작으로 이에 대한 법적 과제가 제시되어 있습니다.
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이날 김 변호사는 4차 산업혁명으로 인해 우리가 경험할 사회, 그리고 거기에 발맞춘 정책과 규제, 입법방향 등에 대해 발표하였습니다.
특히 4차 산업혁명 사회 구현의 8대원칙과 이를 구현하기 위한 입법과제를 제시해 청중의 호응을 얻었습니다.
Experiment study of water based photovoltaic-thermal (PV/T) collectorIJECEIAES
Solar radiation can be converted to the electrical energy and thermal energy by photovoltaic panel and solar collector. In this experiment, PV/T collector was designed, fabricated and tested its performance. The experiment conducted on PV/T collector with water flow at mass flow rate 0.012 kg/s to 0.0255 kg/s. The water flow with the stainless stell absorber help the PV/T collector in increasing the convection of thermal heat transfer. The power output increase with increase of radiation. The efficiency of PVT varies with different intensity of radiation which stated in this experiment for 750 W/m2 and 900 W/m2. The analysis of energy and exergy are excuted and results show energy output for water based PV/T collector are 346 W for solar radiation 700 W/m2 and 457 W for solar radiation 900 W/m2. Meanwhile the total exergy output compared to the PV panel without stainless stell absorber, which the exergy increased by 22.48% for 700 W/m2 and 20.87% for 900 W/m2.
Studies of Dielectric Constant, Dielectric Loss, Loss Tangent and Dielectric ...IOSRJAP
The arrangement of waves or radiation in order of increasing frequencies is called electromagnetic spectrum. Frequency of microwave region is 300MHz to 300GHz. Corresponding wavelength is in between 1mm to 100cm. Here by using a microwave bench dielectric properties such as dielectric constant, dielectric loss, loss tangent and dielectric relaxationtime of Dichlorobenzene, Bromobenzene and Nitrobenzene in different temperatures at X band frequrency are measured. Gopalakrishnan method is used for determination of relaxation time. Here real (€/ ) and imaginary (€")parts of complex dielectric constant( €*) were determined in the 3cm microwave region for different concentration of Dichlorobenzene, Bromobenzene and Nitrobenzene in Cyclohaxene at temperatures 240C, 330C and 410C .The measurement were made at a frequency of 9.98GHz. From the study of relaxation time polarity of above three compounds are studied. From the structural point of view the most interesting Dielectric Relaxation is that involving orientation polarization which depends on the internal structure of molecules and on the molecular arrangement or structure of the dielectric. Dielectric relaxation is the lag in dipole orientation behind an alternating electric field. From the study it is found that relaxation time of these solute is more in Cyclohexane then in Benzene. This behavour can be explained from the fact that Cyclohexane has more internal friction than Benzene.
Experiment 4: Electropolymerized Conducting Polymers.
Introduction:
Conductive polymers (CP) exhibit very useful properties such as flexibility, solubility [1], electrical conductivity, low energy optical transitions, low ionization potential, and high electron affinity.[2] These characterizations make them such effective candidates for many applications such as antistatic and antimagnetic shielding devices[3], microwave attenuation[4], light emitting devices, optical sensors, enzymatic biosensors[5], electronic circuits, and detectors of odors and flavors. The most widely known conducting polymers are polypyrole, polyanaline, and polythiophene. By applying an electrical potential (reversible reaction), these polymers can be reduced. The role of these polymers when they are used as active templates in biosensor applications is the immobilization of dynamic species on the electrode. This will contribute to enhancing the sensitivity and the accuracy of analyte detection. CPs have been used for stabilizing numerous biological species such as enzymes, antibodies, haptens, DNA, and more interestingly the whole cells. [1]
Aim:
The aim of performing this experiment is to create a conducting polypyrrole film which consists of a stabilized enzyme, identify the film and its characteristics, and utilize it as glucose biosensor.
Procedure:
“Refer to Manual for NANO 3101/8302, Electropolymerized Conducting Polymers, Flinders University, p.24-29.”
Results and Discussion:
In the biosensor uses, the deposition of the polymers on the electrode surface can be done by applying an oxidative potential. During this action, the enzymes can be stabilized, and by modifying the deposition time, the amounts of the deposited layer can be recreated. The sensitivity, selectivity, and the accuracy of detection of the biosensors are reliant on the architecture of the polymer, the biological activity of the enzymatic immobilization, and the electropolymerisation circumstances.
In this experiment, the glucose oxidase (enzyme) was immobilized in a conducting polypyrole film on an electrode to find out their appropriateness as a functioning electrode. The performance of the electrode was measured through a Cyclic Voltammogram (CV) of ferricyanide
The geometric area of the electrode was measured by a ruler, and it was found to be 3.14 mm ²which is identical to 0.00314 cm².
The Randles-Sevcik equation is used in the redox reactions
at 25 C °
Where is the peak current, A is the electrode area (cm²), n is the number of electrons involved, C is the concentration of the bulk (mol/ml) for active species, v is the scan rate (V/s), and D is the diffusion coefficient.
n = 1, therefore
, therefore = 0.002756809.
V = 20mV/s = 0.02 V/s, therefore
C = 10 mM = 0.01 mol/L = 0.00001 mol/mL.
can be determined from figure.1
Figure 1: Cyclic Voltammograms (CV) as a function of escalating the scan rate for Platinum Electrode in ferrricyanide solution.
This c ...
In DSC the heat flow is measured and plotted against temperature of furnace or time to get a thermo gram. This is the basis of Differential Scanning Calorimetry (DSC).
The deviation observed above the base (zero) line is called exothermic transition and below is called endothermic transition.
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Experimental Investigation of the potentiality of Nanofluid in enhancing the performance of Hybrid PV/T systems. The global need for energy savings requires the usage of renewable sources in many applications. Harnessing solar energy using photovoltaic cells which converts solar radiation into electricity seems a good alternative to fossil fuels. However the heat trapped in photovoltaic cells during operation decreases the efficiency of the system. To avoid the temperature increase of the PV system we use photovoltaic-thermal hybrid solar system (Hybrid PV/T) where the unfavourable absorbed heat from the cells is collected through an additional thermal unit. Nanofluids are engineered colloidal suspensions of nanoparticles in a base fluid. Generally, the nanofluids possess greater heat transfer characteristics compared to the common fluids.
Thermal denaturation studies can yield a significant amount
of information about the secondary structure of DNA molecules. The double helix structure is held together by the hydrogen bonds in base pairs of adenine-thymine (A-T) and guanine-cytosine (G-C). Since G-C base pairs have three hydrogen bonds compared to the 2 in A-T base pairs, a DNA sample with larger G-C content will require more energy to separate, leading to a higher DNA melt temperature. UV/Visible Spectrophotometry can be used to monitor the thermal denaturation of DNA as the sample is heated allowing determination of the DNA melt temperature, tm, and ultimately the %G-C content of the molecule.
This paper presents the comparison temperature of thermoelectric (Tec1-12708) between the series circuit and parallel circuit by adjusting of water flow rate pump and electrical supplying to thermoelectric, The electrical voltage at 8,10 and 12 V, water flow rate in reservoir was 0.015 kg/s and 0.025 kg/s. Experiments perform were 6 hours. The result from the researches, thermoelectric with parallel circuit high temperature more than thermoelectric with series circuit. The parallel circuit of thermoelectric can work better than the series circuit in hot side. The different temperature hot side of parallel circuit with the electrical voltage at 8, 10 and 12 V water flow rate in reservoir was 0.015 kg/s temperature average is 22.44 oC, 22.90 oC, 29.86 oC, and water flow rate in reservoir was 0.025 kg/s temperature average is 20.67 oC, 26.66 oC, 27.69 oC. Thermoelectric with parallel circuit makes the higher temperature more than thermoelectric with series circuit about 33%, 37%, 44% water flow rate in reservoir was 0.015 kg/s and 30%, 40%, 41% water flow rate in reservoir was 0.025 kg/s.
Experimental study with different cathode and anode humidification temperatur...IJMER
International Journal of Modern Engineering Research (IJMER) is Peer reviewed, online Journal. It serves as an international archival forum of scholarly research related to engineering and science education.
International Journal of Modern Engineering Research (IJMER) covers all the fields of engineering and science: Electrical Engineering, Mechanical Engineering, Civil Engineering, Chemical Engineering, Computer Engineering, Agricultural Engineering, Aerospace Engineering, Thermodynamics, Structural Engineering, Control Engineering, Robotics, Mechatronics, Fluid Mechanics, Nanotechnology, Simulators, Web-based Learning, Remote Laboratories, Engineering Design Methods, Education Research, Students' Satisfaction and Motivation, Global Projects, and Assessment…. And many more.
1. The determination of thermodynamic functions of the reactions in
commercial alkaline-manganese dioxide galvanic cell
Rashid Alsuwaidi, Chris Lieb, Chris Russell and Ralph Eachus
Department of Chemistry, The Pennsylvania State University, University Park, PA 16802
Submitted: February 3, 2014 (CHEM 457, Section 2)
Abstract
The thermodynamic parameters; Δ G, K, ΔS and ΔH which are the Gibbs ,equilibrium constant
,entropy and enthalpy respectively, were calculated for a commercial alkaline-manganese
dioxide galvanic cell. The Δ G was calculated to be -303.4±0.2kJ/mol.The K was measured to be
3.7×10^53 ± 3.7×10 ^50.ΔS was calculated to be -23.0±0.01J/Kmol.The experimental ΔH was
calculated to be 310.3±0.4kJ/mole and compared to the ΔH calculated from the enthalpies of
formation ∆ 𝑓H˚, which was 312kJ/mol.The percent difference was calculated to be 0.55%.
Introduction
A galvanic cell is a simple device which converts chemical energy to electric energy. This occurs
due to redox reactions were reactant are oxidized and the other reduced. In this experiment a AA
Duracell battery was used, which consists of Zinc at the negative terminal which is oxidized and
magnesium dioxide at the positive terminal which is reduced. It uses potassium hydroxide as an
electrolyte which allows high electron mobility at a low freezing point.1 The reaction is shown
below:
Zn(s) + 2OH-(aq) → ZnO(s) + H2O (l) + 2e- (E° = -0.76 V)
2MnO2(s) + H2O (l) + 2e- → Mn2O3(s) + 2OH-(aq) (E° = +.80 V)
Zn(s) + 2MnO2(s) → ZnO(s) + Mn2O3(s) (E° = 1.56 V)
The most common batteries are based on Lithium, lead and nickel with most consumer products
using Lithium –ion batteries. Lithium-ion batteries are mostly used in portable products such as
digital cameras, laptops and phones because it has a high energy density, small size and
inexpensive but has a short battery life. If you’re going to be operating at subzero temperatures
2. then lead-based batteries are better, inexpensive and have a high specific power but it will be
slow to charge, bulky and not environmentally friendly. Batteries can be discharged in over a
wide range of temperatures, while charging has a limited range so it is best to charge a battery at
room temperature to maintain its performance and increase its shelf life. Cold temperatures
increases a batteries internal resistance so it is better to reduce the current when charging.
The purpose of the experiment was to determine parameters Δ G, K, ΔS and ΔH for a AA
Duracell battery and to also compare ΔH to the enthalpy of formation ∆ 𝑓H˚ of the redox reaction
in the battery.
(1) ∆G = -vFE
The Gibbs free energy is calculated using Equation 1.The symbols v, F and E represent the
number of electron involved in the redox reaction, Faradays constant which is 9.6×10 ^4 C/mol
and the electromotive force(V) respectively.
(2) ln K =
𝑣𝐹𝐸
𝑅𝑇
Equation 2 is used to calculate the equilibrium constant K. The ideal gas constant is represented
by R which is 8.314 J/molK, while T is the temperature of the reaction in Kelvin.
(3)
𝑑𝐸
𝑑𝑇
=
∆ 𝑆
𝑣𝐹
By applying the thermodynamic relationship
𝑑𝐺
𝑑𝑇
= −𝑆 in Equation 1 you will arrive at
Equation 3 which was used to calculate ΔS in J/molK. The temperature coefficient of the cell is
represented by
𝑑𝐸
𝑑𝑇
.
3. (4) ∆ 𝐻 = ∆𝐺 + 𝑇∆ 𝑆
The enthalpy of the AA Duracell battery was calculated using Equation 4 in J/mol by using the
values calculated from Equation 1 and 3.
Experimental
The voltage was measured at various temperatures, which was done using two AA Duracell
batteries and a Hewlett Packard 34401A multimeter which has an uncertainty of
±.001mV.1Temperature and voltage are recorded of the battery before being placed in a Dewar
filled with ethanol. Precision is improved by using a reference battery maintained at 0˚C which is
connected in parallel to the measured battery. The positive end of the battery being measured is
connected to the positive end of the voltmeter. Using alligator clips, connect the negative leads
of the measured and reference battery. The reference battery is transferred to the reference
Dewar which is maintained at 0˚C.The positive end of the reference battery is connected to the
negative end (black) of the voltmeter. The voltage of the battery being measured will be recorded
at various temperatures in the range of -25 to 40 ˚C in a Dewar filled with ethanol. The first
reading was recorded at 27.7˚C while trying to maintain the same temperature for 10 minutes
before recording the voltage. Dry ice was added at 4˚C increments to get the second reading.
This was done until 7 data points were collected.
Results
The data collected as shown in Table 1 were then plotted as shown in Figure 1.The measured
temperatures was subtracted from the reference temperature to calculate the actual temperature.
The electromotive force (E˚) was calculated by adding the ∆V and the voltage of battery which
was 1.6062V.
4. Table 1. Voltage of alkaline cell at different temperatures
TREF TMEAS TACTUAL DELTA
V
E(V)
24.2 27.2 27.5 -10.293 1.595907
24.5 23.1 23.5 -9.798 1.596402
24.6 19.2 19.6 -9.288 1.596912
24.6 15.2 15.7 -8.82 1.59738
24.7 11.2 11.8 -8.355 1.597845
24.8 6.7 7.3 -7.891 1.598309
24.8 3.4 4 -7.569 1.598631
Figure.1:Electromotive force vs. temperature
Using Equations 1 and 2 the Δ G and K were calculated to be -303.4±0.2kJ/mole and
3.7×10^53± 3.7×10^50 respectively.2From Figure.1, the best fit line gave us a linear plot with an
error of R2=0.9977 which indicates our results are consistent. The equation of the best fit line has
a slope of -0.00012 ± 2.53×10^-6 which represents the temperature coefficient
𝑑𝐸
𝑑𝑇
.This is used
5. in Equation 3 to calculate the ∆ 𝑆 which was -23.0±0.01 J/molK. Using the values from
Equation 1 and 3 in Equation 4 the experimental ΔH was calculated to be 310.3±0.4kJ/mol
which was 0.55% within the theoretical value of 312kJ/mole calculated from the enthalpies of
formation ∆ 𝑓H˚.3
Discussion
The ΔrH calculated had a percent difference of 0.55% compared to the theoretical value, so a
reasonable value was obtained, while the errors were probably due to things we had no control
over. The 0.55% difference in the values was possibly due to the way the temperatures were
being measured since we can’t measure the internal temperature directly, we had to record the
external temperature of the battery, which is why it must equilibrate for 10 minutes before
recording the temperature and voltage. The error could be reduced if the temperature was
allowed to equilibrate longer to 15 to 20 minutes. In addition; the temperature cannot always be
maintained at the desired temperature using dry ice and it fluctuates. To fix this problem, a
solution with a higher heat capacity such as water could be used, so that the temperature would
not decrease or increase quickly and be maintained at the desired temperature for longer periods,
while the battery equilibrates. When the experiment was conducted the heat from our bodies
might have also contributed to the errors. To have a 1mV precision meant that anything above
99mV that was recorded on the voltmeter will not be accurate so the ∆V was calculated at each
temperature by subtracting the voltage of the measured and reference battery. The ∆V is added to
the initial voltage of the battery to get a precision of 1mV.As the temperature decreases the rate
of the reaction decreases, which causes the internal resistance of the battery to increase but it will
last longer. As the temperature increases the rate of the reaction increases and the internal
resistance decreases but it will shorten the battery life. The temperature range we used showed
only slight changes in the electromotive force, so a higher temperature range such as 40 to 60˚C
or a very low temperature range such as -20 to 0˚C could be tested to see if the results will be
similar. The optimum temperature for the battery is at 25˚C because being colder or hotter would
reduce its performance.
6. Conclusion
To conclude; the Δ G was calculated to be -303.4±0.2kJ/mol. The K was measured to be 3.7×10
^53 ± 3.7×10 ^50.The ΔS was calculated to be -23.0±0.01J/Kmol. The ΔH was calculated to be
310.3 ± 0.4kJ/mol. The experimental ΔH had a percent difference of 0.55% compared to the
theoretical value of 312kJ/mole which was reasonable. The main sources of error where from
recording the external temperatures of the battery instead of the internal and the difficulties in
maintaining the desired temperature using dry ice to equilibrate. This experiment allowed us to
calculate the thermodynamic parameters; ΔG, K, ΔS and ΔH; in addition, showed how the
voltage of the battery is effected by temperature changes.
Acknowledgement
I would like to acknowledge Chris Lieb, Chris Russell and Ralph Eachus, who were the group
members that assisted in performing the experiment and data analysis. In addition; Dr.
Milosavljevic, teaching assistants Mr. Yuguang (Chris) Lee and Ms. Jennifer Tan.
Reference
1. Milosavljevic, B.H. Lab Packet for CHEM 457: Experimental Physical Chemistry, The
determination of thermodynamic functions of the reactions in commercial alkaline-manganese
dioxide galvanic cell. University Press: University Park, 2014.
2. Peter Kissinger, & William R. Heineman. (Eds.). (1996). Laboratory Techniques in Electro
analytical Chemistry (5th Ed.). New York, NY: Marcel Dekker.
3. Denis Hanson, Vi Maeers and Harley Weston, What is Percentage Difference?
http://mathcentral.uregina.ca/about/ (accessed January 30, 2014).
7. Appendix
1.
Regression Statistics
Multiple R 0.998829
R Square 0.99766
Adjusted R Square0.997192
Standard Error5.29E-05
Observations 7
ANOVA
df SS MS F Significance F
Regression 1 5.96E-06 5.96E-06 2131.588 9E-08
Residual 5 1.4E-08 2.8E-09
Total 6 5.98E-06
CoefficientsStandard Errort Stat P-value Lower 95%Upper 95%Lower 95.0%Upper 95.0%
Intercept 1.599165 4.43E-05 36116.54 3.09E-22 1.599051 1.599279 1.599051 1.599279
X Variable 1-0.00012 2.53E-06 -46.1691 9E-08 -0.00012 -0.00011 -0.00012 -0.00011