This document provides an introduction to thermodynamics concepts. It discusses the differences between thermodynamics and heat transfer, explaining that thermodynamics deals with energy and energy transformations in systems at equilibrium, while heat transfer determines the rates of energy transfer. Some key thermodynamic concepts introduced include state, path, process, cycle, intensive and extensive properties, forms of energy, the state postulate, and various thermodynamic processes like isothermal, isobaric, and adiabatic processes. Common thermodynamic properties like pressure, temperature, and their measurement units are also explained.
This document introduces fundamental concepts in engineering thermodynamics. It defines thermodynamics as the science of energy and discusses how it deals with heat, work, and their effects on temperature and pressure. Systems can be closed, open, or isolated depending on how mass and energy cross their boundaries. The state and properties of a system are described, as well as processes, equilibrium, and steady-flow processes. Common units and dimensions in thermodynamics are outlined. Specific volume, pressure, and temperature are also defined.
Basis review of thermodynamics_Aircraft PropulsionSuthan Rajendran
This document provides an overview of basic concepts in thermodynamics. It discusses why thermodynamics is important for understanding energy usage in society. It defines key thermodynamic concepts like system, surroundings, boundary, state, property, process, cycle, and equilibrium. It also covers the zeroth law of thermodynamics and defines temperature. The document aims to introduce foundational thermodynamic terms and concepts.
The document discusses various thermodynamic processes including isothermal, adiabatic, isochoric, and isobaric processes. It provides examples of each process and explains that an isothermal process keeps temperature constant, an adiabatic process keeps heat content constant, an isochoric process keeps volume constant, and an isobaric process keeps pressure constant. It also discusses thermodynamic states, properties, cycles, and the zeroth law of thermodynamics.
Here are the key steps to solve this problem:
1) Given: Initial diameter (D1) = 0.5 m
Initial pressure (P1) = 500 kPa
Final diameter (D2) = 0.55 m
2) The pressure is proportional to diameter. So we can write:
P/P1 = (D/D1)n
Where n is the proportionality constant.
3) Since the process is reversible, n = 1 (based on the property of reversible process where PV must be proportional to T).
4) Putting n = 1 in the above equation, we get:
P2/P1 = (D2/D1
Subject: ME8391 Engineering Thermodynamics
Topic: Basic Concepts & First law of Thermodynamics
B.E. Mechanical Engineering
Second year, III Semester.
[Anna University R-2017]
thermodynamics introduction & first lawAshish Mishra
This document provides an overview of thermodynamics and the first law. It discusses key concepts like state, path, cycle, boundary work, heat transfer, internal energy, and enthalpy. Several thermodynamic processes are defined including isothermal, isobaric, isochoric, and adiabatic. Joule's experiment is described which proved that energy is a property of the system. The first law of thermodynamics is introduced as the quantitative expression of the law of conservation of energy as it applies to thermodynamic processes.
The document discusses thermodynamics from both macroscopic and microscopic viewpoints. It defines key concepts like system, surroundings, open and closed systems, intensive and extensive properties, state, equilibrium, processes, cycles, work, heat transfer, and different types of thermodynamic processes. Specific processes discussed include isobaric, isochoric, isothermal, and polytropic processes. The document also explains the zeroth law of thermodynamics and its importance for temperature measurement.
This document introduces fundamental concepts in engineering thermodynamics. It defines thermodynamics as the science of energy and discusses how it deals with heat, work, and their effects on temperature and pressure. Systems can be closed, open, or isolated depending on how mass and energy cross their boundaries. The state and properties of a system are described, as well as processes, equilibrium, and steady-flow processes. Common units and dimensions in thermodynamics are outlined. Specific volume, pressure, and temperature are also defined.
Basis review of thermodynamics_Aircraft PropulsionSuthan Rajendran
This document provides an overview of basic concepts in thermodynamics. It discusses why thermodynamics is important for understanding energy usage in society. It defines key thermodynamic concepts like system, surroundings, boundary, state, property, process, cycle, and equilibrium. It also covers the zeroth law of thermodynamics and defines temperature. The document aims to introduce foundational thermodynamic terms and concepts.
The document discusses various thermodynamic processes including isothermal, adiabatic, isochoric, and isobaric processes. It provides examples of each process and explains that an isothermal process keeps temperature constant, an adiabatic process keeps heat content constant, an isochoric process keeps volume constant, and an isobaric process keeps pressure constant. It also discusses thermodynamic states, properties, cycles, and the zeroth law of thermodynamics.
Here are the key steps to solve this problem:
1) Given: Initial diameter (D1) = 0.5 m
Initial pressure (P1) = 500 kPa
Final diameter (D2) = 0.55 m
2) The pressure is proportional to diameter. So we can write:
P/P1 = (D/D1)n
Where n is the proportionality constant.
3) Since the process is reversible, n = 1 (based on the property of reversible process where PV must be proportional to T).
4) Putting n = 1 in the above equation, we get:
P2/P1 = (D2/D1
Subject: ME8391 Engineering Thermodynamics
Topic: Basic Concepts & First law of Thermodynamics
B.E. Mechanical Engineering
Second year, III Semester.
[Anna University R-2017]
thermodynamics introduction & first lawAshish Mishra
This document provides an overview of thermodynamics and the first law. It discusses key concepts like state, path, cycle, boundary work, heat transfer, internal energy, and enthalpy. Several thermodynamic processes are defined including isothermal, isobaric, isochoric, and adiabatic. Joule's experiment is described which proved that energy is a property of the system. The first law of thermodynamics is introduced as the quantitative expression of the law of conservation of energy as it applies to thermodynamic processes.
The document discusses thermodynamics from both macroscopic and microscopic viewpoints. It defines key concepts like system, surroundings, open and closed systems, intensive and extensive properties, state, equilibrium, processes, cycles, work, heat transfer, and different types of thermodynamic processes. Specific processes discussed include isobaric, isochoric, isothermal, and polytropic processes. The document also explains the zeroth law of thermodynamics and its importance for temperature measurement.
Thermodynamics is defined as the science of energy. It studies the transformation of heat into mechanical work and vice versa. Thermodynamics has applications in systems like the human body, refrigerators, engines, turbines, heaters, and solar collectors. A system is defined as the quantity of matter under study, surrounded by its surroundings. A boundary separates the system and surroundings. Closed systems do not allow mass transfer while open systems do. Equilibrium exists when properties do not vary within a system. State refers to the condition defined by properties like temperature, pressure and volume. Quasi-static processes are reversible while non-quasi-static processes are irreversible. Cycles occur when a system returns to its original state.
This document provides an overview of basic thermodynamics concepts including definitions of thermodynamics, thermodynamic systems, properties, processes and cycles. It discusses important thermodynamic concepts such as state, path, reversible and irreversible processes, equilibrium, and measurement of pressure. Examples are given to illustrate compression processes and the use of the Pascal's law for pressure measurement.
1) This document discusses heat, work, and the first law of thermodynamics. It defines heat and work as the two ways energy can transfer across the boundary of a closed system, with heat transferring due to a temperature difference and work occurring from a force acting through a distance.
2) The first law of thermodynamics states that the change in a system's internal energy is equal to the net heat transferred to the system plus the net work done by the system. This is illustrated with examples of processes involving only heat transfer, where the energy change equals the net heat.
3) Different types of thermodynamic processes are examined, including isobaric, isochoric, isothermal, and poly
Here are the key steps to derive the expression for heat of reaction at constant pressure:
1) For a chemical reaction occurring at constant pressure, the enthalpy change (ΔH) is equal to the heat absorbed or released by the system (qP).
2) Enthalpy change (ΔH) is defined as the change in internal energy (ΔU) plus the product of pressure (P) and change in volume (ΔV).
ΔH = ΔU + PΔV
3) For a reaction at constant pressure, the volume change (ΔV) is small and pressure remains constant.
4) From the first law of thermodynamics, the change in internal energy (Δ
1) The document discusses heat, work, and the first law of thermodynamics. It defines heat and work as the two types of energy transfer across boundaries of closed systems.
2) The first law of thermodynamics, also called the law of conservation of energy, states that the total energy of a system remains constant, with increases in internal energy equal to net heat and work transfers.
3) Specific examples are provided to illustrate the first law for closed systems undergoing various processes like heating, cooling, and adiabatic changes with and without work. Formulas are derived for calculating internal energy changes based on the first law.
The document discusses key concepts in thermodynamics including:
- Systems can be open, closed, or isolated depending on whether work, heat, and mass cross the boundary.
- A system's state is defined by properties like temperature, pressure, and volume. A process occurs as the system moves between states.
- The first law of thermodynamics concerns the conservation of energy as work and heat are applied to a system. The second law concerns entropy.
- Systems must be in thermal, mechanical, and chemical equilibrium for their properties to be well-defined and for reversible processes to occur. Temperature is a measure of thermal equilibrium.
The document provides an overview of thermodynamics concepts including:
- Defining thermodynamics as the science of energy and introducing key concepts like internal energy, the first and second laws of thermodynamics, and applications of thermodynamics.
- Discussing systems, properties, processes, and the importance of units and dimensions.
- Explaining concepts like temperature, pressure, density, state, equilibrium, and different types of systems and processes.
- Introducing problem-solving techniques in thermodynamics including defining the problem, developing a schematic, making assumptions, applying physical laws, and performing calculations.
- Providing an introduction to properties of pure substances and phase change processes
Here are the key steps to solve this problem:
1. Given: TH = 817°C = 817 + 273 = 1090 K
TL = 25°C = 25 + 273 = 298 K
QR = 25 kW
2. Use the Carnot efficiency equation:
η = (TH - TL)/TH = (1090 - 298)/1090 = 0.726
3. Set up an equation for the heat input using the efficiency and heat rejected:
QA = QR/(1-η) = 25000/(1-0.726) = 87500 kW
Therefore, the heat input (QA) required is 87500 kW.
This document discusses entropy and the second law of thermodynamics. It can be summarized as follows:
1. Entropy is a quantitative measure of disorder or randomness in a system. The second law states that entropy always increases or remains constant in isolated systems, meaning disorder cannot decrease over time.
2. The entropy change of a system is defined for reversible processes, where it is equal to the integral of heat transfer over temperature. For irreversible processes, the entropy change is greater than this integral.
3. The increase of entropy principle states that the entropy of an isolated system always increases during a process, or remains constant for reversible processes. This means the entropy of the universe is continuously increasing over time as no
This document provides an introduction to basic thermodynamics concepts. It begins by outlining the objectives of defining key vocabulary, reviewing unit systems, and explaining basic concepts like system, state, equilibrium, process and cycle. It then discusses energy and the first and second laws of thermodynamics. The document also defines properties of systems, intensive vs extensive properties, and concepts like continuum, density, and the state postulate. Finally, it covers processes, cycles, temperature scales, and pressure. The overall aim is to establish foundational thermodynamics concepts.
Lecture No.2 [Repaired].pdf A very importantshahzad5098115
Thermodynamics is the branch of science that deals with heat, work, and various forms of energy. It describes the relationships between heat, work, temperature, and energy. Thermodynamics applies conservation of energy principles to thermal engines and heat pumps and governs processes involving phase transitions, such as boiling and condensation. Systems can be open, closed, or isolated depending on whether and how much mass and energy are allowed to cross the system boundary. A system's state is defined by properties like temperature, pressure, and volume, and equilibrium refers to a state of balance without temperature, pressure, or chemical gradients.
This document defines key thermodynamic terms and concepts. It discusses systems and surroundings, open, closed, and isolated systems. It explains state functions like internal energy and enthalpy, and describes different types of processes including isothermal, adiabatic, and free expansion. Heat capacity and the relationship between Cp and Cv for ideal gases are also covered. Measurement of energy changes using calorimetry is briefly discussed.
This document provides an introduction to thermodynamics. It defines thermodynamics as the science dealing with heat, work, and their relation to properties of matter and energy change. The document outlines the four laws of thermodynamics and describes the zeroth law regarding thermal equilibrium, the first law regarding conservation of energy and internal energy, the second law regarding limits on heat conversion and direction of processes, and the third law defining absolute zero entropy. Examples of engineering applications are given in areas like heat engines, refrigeration, and air conditioning. Key concepts discussed include system, surroundings, state, path, process, equilibrium, intensive/extensive properties, and reversible/irreversible processes.
This document provides an introduction to engineering thermodynamics for mechanical engineering students. It defines key concepts like system, state, path, process, equilibrium and introduces the three laws of thermodynamics. The first law is the conservation of energy, the second law is the conservation of entropy, and the zeroth law defines thermal equilibrium. It explains the differences between open, closed and isolated systems and discusses properties of state, intensive and extensive properties. Reversible and irreversible processes are also defined. The goal is to provide students the foundation to analyze thermodynamic processes and devices.
The First Law of Thermodynamics states that energy can neither be created nor destroyed, only changed in form. It is an expression of the principle of conservation of energy. For a closed system undergoing a process, the total energy entering equals the total energy leaving plus any change in the system's internal energy. For open systems, energy transfers due to heat, work, and mass flows must be considered. The energy of a flowing fluid includes its internal energy, kinetic energy, potential energy, and flow energy.
Energy cannot be created or destroyed, it can only change forms (first law of thermodynamics). Heat flows in the direction of decreasing temperature (second law of thermodynamics). Thermodynamics is the study of energy and how it transfers between systems and their surroundings. A system is a quantity of matter selected for study, while surroundings are what is outside the system boundary.
Basic concept and first law of thermodynamics agsmeice
This document provides an introduction to engineering thermodynamics. It defines key terms like heat, power, temperature, and the science of thermodynamics. It describes different types of thermodynamic systems like closed, open, isolated, homogeneous, and heterogeneous systems. The document outlines thermodynamic properties, processes, cycles, and the first law of thermodynamics. It also reviews the laws of perfect gases and examples of thermodynamic processes like isothermal, isobaric, isochoric, reversible, and adiabatic processes.
TOPIC OF DISCUSSION: CENTRIFUGATION SLIDESHARE.pptxshubhijain836
Centrifugation is a powerful technique used in laboratories to separate components of a heterogeneous mixture based on their density. This process utilizes centrifugal force to rapidly spin samples, causing denser particles to migrate outward more quickly than lighter ones. As a result, distinct layers form within the sample tube, allowing for easy isolation and purification of target substances.
Thermodynamics is defined as the science of energy. It studies the transformation of heat into mechanical work and vice versa. Thermodynamics has applications in systems like the human body, refrigerators, engines, turbines, heaters, and solar collectors. A system is defined as the quantity of matter under study, surrounded by its surroundings. A boundary separates the system and surroundings. Closed systems do not allow mass transfer while open systems do. Equilibrium exists when properties do not vary within a system. State refers to the condition defined by properties like temperature, pressure and volume. Quasi-static processes are reversible while non-quasi-static processes are irreversible. Cycles occur when a system returns to its original state.
This document provides an overview of basic thermodynamics concepts including definitions of thermodynamics, thermodynamic systems, properties, processes and cycles. It discusses important thermodynamic concepts such as state, path, reversible and irreversible processes, equilibrium, and measurement of pressure. Examples are given to illustrate compression processes and the use of the Pascal's law for pressure measurement.
1) This document discusses heat, work, and the first law of thermodynamics. It defines heat and work as the two ways energy can transfer across the boundary of a closed system, with heat transferring due to a temperature difference and work occurring from a force acting through a distance.
2) The first law of thermodynamics states that the change in a system's internal energy is equal to the net heat transferred to the system plus the net work done by the system. This is illustrated with examples of processes involving only heat transfer, where the energy change equals the net heat.
3) Different types of thermodynamic processes are examined, including isobaric, isochoric, isothermal, and poly
Here are the key steps to derive the expression for heat of reaction at constant pressure:
1) For a chemical reaction occurring at constant pressure, the enthalpy change (ΔH) is equal to the heat absorbed or released by the system (qP).
2) Enthalpy change (ΔH) is defined as the change in internal energy (ΔU) plus the product of pressure (P) and change in volume (ΔV).
ΔH = ΔU + PΔV
3) For a reaction at constant pressure, the volume change (ΔV) is small and pressure remains constant.
4) From the first law of thermodynamics, the change in internal energy (Δ
1) The document discusses heat, work, and the first law of thermodynamics. It defines heat and work as the two types of energy transfer across boundaries of closed systems.
2) The first law of thermodynamics, also called the law of conservation of energy, states that the total energy of a system remains constant, with increases in internal energy equal to net heat and work transfers.
3) Specific examples are provided to illustrate the first law for closed systems undergoing various processes like heating, cooling, and adiabatic changes with and without work. Formulas are derived for calculating internal energy changes based on the first law.
The document discusses key concepts in thermodynamics including:
- Systems can be open, closed, or isolated depending on whether work, heat, and mass cross the boundary.
- A system's state is defined by properties like temperature, pressure, and volume. A process occurs as the system moves between states.
- The first law of thermodynamics concerns the conservation of energy as work and heat are applied to a system. The second law concerns entropy.
- Systems must be in thermal, mechanical, and chemical equilibrium for their properties to be well-defined and for reversible processes to occur. Temperature is a measure of thermal equilibrium.
The document provides an overview of thermodynamics concepts including:
- Defining thermodynamics as the science of energy and introducing key concepts like internal energy, the first and second laws of thermodynamics, and applications of thermodynamics.
- Discussing systems, properties, processes, and the importance of units and dimensions.
- Explaining concepts like temperature, pressure, density, state, equilibrium, and different types of systems and processes.
- Introducing problem-solving techniques in thermodynamics including defining the problem, developing a schematic, making assumptions, applying physical laws, and performing calculations.
- Providing an introduction to properties of pure substances and phase change processes
Here are the key steps to solve this problem:
1. Given: TH = 817°C = 817 + 273 = 1090 K
TL = 25°C = 25 + 273 = 298 K
QR = 25 kW
2. Use the Carnot efficiency equation:
η = (TH - TL)/TH = (1090 - 298)/1090 = 0.726
3. Set up an equation for the heat input using the efficiency and heat rejected:
QA = QR/(1-η) = 25000/(1-0.726) = 87500 kW
Therefore, the heat input (QA) required is 87500 kW.
This document discusses entropy and the second law of thermodynamics. It can be summarized as follows:
1. Entropy is a quantitative measure of disorder or randomness in a system. The second law states that entropy always increases or remains constant in isolated systems, meaning disorder cannot decrease over time.
2. The entropy change of a system is defined for reversible processes, where it is equal to the integral of heat transfer over temperature. For irreversible processes, the entropy change is greater than this integral.
3. The increase of entropy principle states that the entropy of an isolated system always increases during a process, or remains constant for reversible processes. This means the entropy of the universe is continuously increasing over time as no
This document provides an introduction to basic thermodynamics concepts. It begins by outlining the objectives of defining key vocabulary, reviewing unit systems, and explaining basic concepts like system, state, equilibrium, process and cycle. It then discusses energy and the first and second laws of thermodynamics. The document also defines properties of systems, intensive vs extensive properties, and concepts like continuum, density, and the state postulate. Finally, it covers processes, cycles, temperature scales, and pressure. The overall aim is to establish foundational thermodynamics concepts.
Lecture No.2 [Repaired].pdf A very importantshahzad5098115
Thermodynamics is the branch of science that deals with heat, work, and various forms of energy. It describes the relationships between heat, work, temperature, and energy. Thermodynamics applies conservation of energy principles to thermal engines and heat pumps and governs processes involving phase transitions, such as boiling and condensation. Systems can be open, closed, or isolated depending on whether and how much mass and energy are allowed to cross the system boundary. A system's state is defined by properties like temperature, pressure, and volume, and equilibrium refers to a state of balance without temperature, pressure, or chemical gradients.
This document defines key thermodynamic terms and concepts. It discusses systems and surroundings, open, closed, and isolated systems. It explains state functions like internal energy and enthalpy, and describes different types of processes including isothermal, adiabatic, and free expansion. Heat capacity and the relationship between Cp and Cv for ideal gases are also covered. Measurement of energy changes using calorimetry is briefly discussed.
This document provides an introduction to thermodynamics. It defines thermodynamics as the science dealing with heat, work, and their relation to properties of matter and energy change. The document outlines the four laws of thermodynamics and describes the zeroth law regarding thermal equilibrium, the first law regarding conservation of energy and internal energy, the second law regarding limits on heat conversion and direction of processes, and the third law defining absolute zero entropy. Examples of engineering applications are given in areas like heat engines, refrigeration, and air conditioning. Key concepts discussed include system, surroundings, state, path, process, equilibrium, intensive/extensive properties, and reversible/irreversible processes.
This document provides an introduction to engineering thermodynamics for mechanical engineering students. It defines key concepts like system, state, path, process, equilibrium and introduces the three laws of thermodynamics. The first law is the conservation of energy, the second law is the conservation of entropy, and the zeroth law defines thermal equilibrium. It explains the differences between open, closed and isolated systems and discusses properties of state, intensive and extensive properties. Reversible and irreversible processes are also defined. The goal is to provide students the foundation to analyze thermodynamic processes and devices.
The First Law of Thermodynamics states that energy can neither be created nor destroyed, only changed in form. It is an expression of the principle of conservation of energy. For a closed system undergoing a process, the total energy entering equals the total energy leaving plus any change in the system's internal energy. For open systems, energy transfers due to heat, work, and mass flows must be considered. The energy of a flowing fluid includes its internal energy, kinetic energy, potential energy, and flow energy.
Energy cannot be created or destroyed, it can only change forms (first law of thermodynamics). Heat flows in the direction of decreasing temperature (second law of thermodynamics). Thermodynamics is the study of energy and how it transfers between systems and their surroundings. A system is a quantity of matter selected for study, while surroundings are what is outside the system boundary.
Basic concept and first law of thermodynamics agsmeice
This document provides an introduction to engineering thermodynamics. It defines key terms like heat, power, temperature, and the science of thermodynamics. It describes different types of thermodynamic systems like closed, open, isolated, homogeneous, and heterogeneous systems. The document outlines thermodynamic properties, processes, cycles, and the first law of thermodynamics. It also reviews the laws of perfect gases and examples of thermodynamic processes like isothermal, isobaric, isochoric, reversible, and adiabatic processes.
TOPIC OF DISCUSSION: CENTRIFUGATION SLIDESHARE.pptxshubhijain836
Centrifugation is a powerful technique used in laboratories to separate components of a heterogeneous mixture based on their density. This process utilizes centrifugal force to rapidly spin samples, causing denser particles to migrate outward more quickly than lighter ones. As a result, distinct layers form within the sample tube, allowing for easy isolation and purification of target substances.
Mending Clothing to Support Sustainable Fashion_CIMaR 2024.pdfSelcen Ozturkcan
Ozturkcan, S., Berndt, A., & Angelakis, A. (2024). Mending clothing to support sustainable fashion. Presented at the 31st Annual Conference by the Consortium for International Marketing Research (CIMaR), 10-13 Jun 2024, University of Gävle, Sweden.
SDSS1335+0728: The awakening of a ∼ 106M⊙ black hole⋆Sérgio Sacani
Context. The early-type galaxy SDSS J133519.91+072807.4 (hereafter SDSS1335+0728), which had exhibited no prior optical variations during the preceding two decades, began showing significant nuclear variability in the Zwicky Transient Facility (ZTF) alert stream from December 2019 (as ZTF19acnskyy). This variability behaviour, coupled with the host-galaxy properties, suggests that SDSS1335+0728 hosts a ∼ 106M⊙ black hole (BH) that is currently in the process of ‘turning on’. Aims. We present a multi-wavelength photometric analysis and spectroscopic follow-up performed with the aim of better understanding the origin of the nuclear variations detected in SDSS1335+0728. Methods. We used archival photometry (from WISE, 2MASS, SDSS, GALEX, eROSITA) and spectroscopic data (from SDSS and LAMOST) to study the state of SDSS1335+0728 prior to December 2019, and new observations from Swift, SOAR/Goodman, VLT/X-shooter, and Keck/LRIS taken after its turn-on to characterise its current state. We analysed the variability of SDSS1335+0728 in the X-ray/UV/optical/mid-infrared range, modelled its spectral energy distribution prior to and after December 2019, and studied the evolution of its UV/optical spectra. Results. From our multi-wavelength photometric analysis, we find that: (a) since 2021, the UV flux (from Swift/UVOT observations) is four times brighter than the flux reported by GALEX in 2004; (b) since June 2022, the mid-infrared flux has risen more than two times, and the W1−W2 WISE colour has become redder; and (c) since February 2024, the source has begun showing X-ray emission. From our spectroscopic follow-up, we see that (i) the narrow emission line ratios are now consistent with a more energetic ionising continuum; (ii) broad emission lines are not detected; and (iii) the [OIII] line increased its flux ∼ 3.6 years after the first ZTF alert, which implies a relatively compact narrow-line-emitting region. Conclusions. We conclude that the variations observed in SDSS1335+0728 could be either explained by a ∼ 106M⊙ AGN that is just turning on or by an exotic tidal disruption event (TDE). If the former is true, SDSS1335+0728 is one of the strongest cases of an AGNobserved in the process of activating. If the latter were found to be the case, it would correspond to the longest and faintest TDE ever observed (or another class of still unknown nuclear transient). Future observations of SDSS1335+0728 are crucial to further understand its behaviour. Key words. galaxies: active– accretion, accretion discs– galaxies: individual: SDSS J133519.91+072807.4
Embracing Deep Variability For Reproducibility and Replicability
Abstract: Reproducibility (aka determinism in some cases) constitutes a fundamental aspect in various fields of computer science, such as floating-point computations in numerical analysis and simulation, concurrency models in parallelism, reproducible builds for third parties integration and packaging, and containerization for execution environments. These concepts, while pervasive across diverse concerns, often exhibit intricate inter-dependencies, making it challenging to achieve a comprehensive understanding. In this short and vision paper we delve into the application of software engineering techniques, specifically variability management, to systematically identify and explicit points of variability that may give rise to reproducibility issues (eg language, libraries, compiler, virtual machine, OS, environment variables, etc). The primary objectives are: i) gaining insights into the variability layers and their possible interactions, ii) capturing and documenting configurations for the sake of reproducibility, and iii) exploring diverse configurations to replicate, and hence validate and ensure the robustness of results. By adopting these methodologies, we aim to address the complexities associated with reproducibility and replicability in modern software systems and environments, facilitating a more comprehensive and nuanced perspective on these critical aspects.
https://hal.science/hal-04582287
This presentation offers a general idea of the structure of seed, seed production, management of seeds and its allied technologies. It also offers the concept of gene erosion and the practices used to control it. Nursery and gardening have been widely explored along with their importance in the related domain.
Sexuality - Issues, Attitude and Behaviour - Applied Social Psychology - Psyc...PsychoTech Services
A proprietary approach developed by bringing together the best of learning theories from Psychology, design principles from the world of visualization, and pedagogical methods from over a decade of training experience, that enables you to: Learn better, faster!
2. THERMO vs. HEAT TRANSFER
• Thermodynamics stems from the Greek words
therme (heat) and dynamis (power or motion),
which is most descriptive of the early efforts to
convert heat into power. Today thermodynamics
is broadly interpreted to include all aspects of
energy and energy transformations, including
power generation, refrigeration, and
relationships among the properties of matter.
• Heat transfers the science that deals with the
determination of the rates of such energy
transfer.
3. THERMO vs. HEAT TRANSFER (cont)
• Thermodynamics membicarakan sistem keseimbangan
(equilibrium), bisa digunakan untuk menaksir besarnya
energi yang diperlukan untuk mengubah suatu sistem
keseimbangan, tetapi tidak dapat dipakai untuk
menaksir seberapa cepat (laju) perubahan itu terjadi
karena selama proses sistem tidak berada dalam
keseimbangan.
• Heat Transfer tidak hanya menerangkan bagaimana
energi itu dihantarkan, tetapi juga menaksir laju
penghantaran energi. Inilah yang membedakan Heat
Transfer dengan thermodinamika.
4. APLIKASI
• Tubuh manusia
• Meniup kopi panas
• Perkakas elektronik (sirip, heat sink)
• Refrigerator (AC, Kulkas)
• Mobil (siklus engine, sirip, radiator)
• Pembangkit listrik (turbin, boiler)
• Industri (penyulingan, pendinginan,
pengeringan, dll).
5. DIMENSI dan SATUAN
• Dimensi (M,L,T,θ) homogen
• Satuan : SI Units (m, s, kg, K)
• Kesalahan umum:
1. Tidak paham
2. Usaha minimal, kurang
latihan
3. Tidak terampil melakukan
konversi satuan
• Trik: perhitungan harus
menyertakan satuan
6. SECONDARY UNITS
• Secondary units can be formed by
combinations of primary units. Example:
2
s
m
kg
N
• F = m.a
• P = F/A 2
m
N
Pa 2
2
/
.
m
s
m
kg
Pa
2
.s
m
kg
Pa
7. SISTEM vs. LINGKUNGAN
• A system is defined as a quantity of matter or
a region in space chosen for study.
• The mass or region outside the system is
called the surroundings.
• The real or imaginary surface that
separates the system from
its surroundings is called the
boundary
8. OPEN vs. CLOSSED SYSTEMS
• Closed system (= control
mass): Mass can’t cross the
boundary, but energy can.
• Volume of a closed system
may change.
• Special case, if no energy
cross the boundary, that
system is called an isolated
system.
10. OPEN vs. CLOSSED SYSTEMS
• Open system (= control volume) is a properly
selected region in space. It usually encloses a
device that involves mass flow such as a
compressor, turbine, or nozzle.
• Both mass and energy can cross the boundary
of a control volume.
• The boundaries of a control volume are called
a control surface, and they can be real or
imaginary.
12. OPEN SYSTEM
Open system (= control
volume) with one inlet
and one outlet (exit) and
a real boundary.
13. SIFAT-SIFAT SISTEM
• Any characteristic of a system is called a property.
• Some familiar properties are pressure P, temperature T,
volume V, and mass m. The list can be extended to include
less familiar ones such as viscosity, thermal conductivity,
modulus of elasticity, thermal expansion coefficient,
electric resistivity, and even velocity and elevation.
• Intensive properties are those that are independent of the
mass of a system, such as temperature, pressure, and
density.
• Extensive properties are those whose values depend on the
size—or extent—of the system.
• Extensive properties per unit mass are called specific
properties (specific volume (v = V/m), specific energy (e =
E/m).
14. SIFAT INTENSIF vs. EKSTENSIF
TUGAS (dikumpul Senin) :
Sebuah apel dibelah dua.
Buatlah daftar sifat
intensif dan ekstensifnya
Criterion to differentiate
intensive and extensive
properties.
15. SIFAT-SIFAT SISTEM PENTING
• Densitas atau massa jenis:
masa per satuan volume
• Volume spesifik, kebalikan dari
densitas: volume per satuan
masa (m3/kg)
• Densitas relatif atau specific
gravity: nisbah densitas suatu
substansi dengan densitas
substansi standar pada suhu
tertentu (biasanya air pada 4oC
di mana = 1000 kg/m3)
16. ENERGY SISTEM TERMODINAMIKA
• BENTUK ENERGI:
1. Energi Kinetik (KE)
2. Energi Potensial (PE) PE = mgh
3. Energi dakhil atau Internal Energy (U)
• ENERGI TOTAL:
E = U + KE + PE
e = u + ke + pe (per satuan massa)
2
2
1
mV
KE
17. POSTULAT KEADAAN
• All properties (can be measured or calculated)
completely describes the condition, or the state,
of the system. At a given state, all the properties
of a system have fixed values. If the value of even
one property changes, the state will change to a
different one.
• The number of properties required to fix the state
of a system is given by the state postulate:
The state of a simple compressible system is
completely specified by two independent,
intensive properties.
18. PROSES dan SIKLUS
• Any change that a
system undergoes from
one equilibrium state to
another is called a
process
• The series of states
through which a system
passes during a process
is called the path
(lintasan) of the process.
19. MACAM-MACAM PROSES
• Proses isotermal: proses pada suhu T konstan.
• Proses isobaris: proses pada tekanan P konstan.
• Proses isokhoris (isometris): proses pada
volume spesifik konstan.
• Proses adiabatik: proses di mana tidak terjadi
pertukaran kalor dengan lingkungan.
• Proses isentropik: proses pada entropi S
konstan.
20. STEADY-FLOW PROCESS
• The terms steady and uniform are used
frequently in engineering, and thus it is
important to have a clear understanding of
their meanings.
• The term steady implies no change with time.
• The opposite of steady is unsteady, or
transient.
• The term uniform, however, implies no change
with location over a specified region.
21. PROSES dan SIKLUS
• A system undergoes a cycle if it returns to its
initial state at the end of the process.
Siklus dengan 2 lintasan Siklus dengan 4 lintasan
22. TEKANAN
• Tekanan (P) : gaya (F) per satuan luas (A).
• Satuan tekanan adalah pascal (Pa) = N/m2.
• Untuk benda padat gaya per luas satuan tidak disebut
tekanan, tetapi tegangan (stress).
• Untuk fluida diam, tekanan adalah sama ke segala arah.
• Tekanan di dalam fluida meningkat sesuai dengan
kedalamannya akibat berat fluida (pengaruh gravitasi)
sehingga fluida pada bagian bawah menanggung beban
yang lebih besar daripada fluida di bagian atas.
• Tetapi tekanan tidak bervariasi pada arah horisontal.
• Tekanan gas di dalam tangki dapat dianggap seragam
karena berat gas terlalu kecil dan tidak mengakibatkan
pengaruh yang berarti.
23. TEKANAN: UKUR, ATM, VAKUM
• Tekanan aktual pada posisi tertentu disebut tekanan
absolut dan diukur secara relatif terhadap tekanan
vakum, yaitu tekanan nol mutlak.
• Kebanyakan pengukur tekanan dikalibrasi untuk
membaca nol di atmosfer (tekanan atmosfer lokal).
• Perbedaan tekanan absolut dan tekanan atmosfer
disebut tekanan ukur (pressure gage).
• Tekanan di bawah tekanan atmosfer disebut tekanan
vakum (vacuum pressure) dan diukur dengan
pengukur vakum yang menunjukkan perbedaan antara
tekanan atmosfer dan tekanan absolut.
• Pgage = Pabs – Patm (untuk P > Patm)
• Pvac = Patm – Pabs (untuk P < Patm)
26. PRINSIP MANOMETER
Perhatikan gambar:
• Seimbang F = 0
• P1 = P2
• A P1 = A Patm + W
di mana W = m g =
V g = A h g
• P1 = Patm + h g
• P = P1 - Patm = h g = Tekanan ukur di dalam tangki
27. EXAMPLE : Manometer
A manometer is used to
measure the pressure in a
tank. The fluid used has a
specific gravity of 0.85, and
the manometer column
height is 55 cm, as shown in
Figure. If the local
atmospheric pressure is 96
kPa, determine the absolute
pressure within the tank.
29. EXAMPLE: MULTIFLUID MANOMETER
Water in a tank is pressurized by
air, and the pressure is measured
by a multifluid manometer (see
Figure). The tank is located on a
mountain at an altitude of 1400 m
where the atmospheric pressure is
85.6 kPa. Determine the air
pressure in the tank if h1 = 0.1 m,
h2 = 0.2 m, and h3 = 0.35 m. Take
the densities of water, oil, and
mercury to be 1000 kg/m3, 850
kg/m3, and 13,600 kg/m3,
respectively.
31. APLIKASI MANOMETER
P1 + 1g(a + h) - 2gh - 1ga = P2
P1 - P2 = (2 - 1)gh
Untuk 2 >> 1 :
P1 - P2 ≈ 2 g h
Measuring the
pressure drop across
a flow section or a
flow device by a
differential
manometer:
33. EXAMPLE3: BAROMETER
• Determine the atmospheric pressure at a
location where the barometric reading is 740
mm Hg and the gravitational acceleration is g
9.81 m/s2. Assume the temperature of
mercury to be 10oC, at which its density is
13,570 kg/m3.