LJ

java.lang.Object
- etomica.units.systems.UnitSystem
- - etomica.units.systems.LJ

```
public class LJ
extends UnitSystem
```
Lennard-Jones system of units, such that all quantities are made dimensionless with respect to a characteristic size (sigma), energy (epsilon) and mass. Values of sigma, epsilon and mass reside with the instance of the LJ unit system, to which each unit refers when making its conversion. Thus any changes in sigma, epsilon, or mass are immediately recognized by the unit conversions. Values of sigma, epsilon, and mass are specified in simulation units. Default values are each 1.0.

Nested Class Summary

Nested Classes
Modifier and Type Class Description

static class LJ.LJUnit
- Nested classes/interfaces inherited from class etomica.units.systems.UnitSystem
  UnitSystem.Sim

Nested Classes
Modifier and Type	Class	Description
`static class`	`LJ.LJUnit`

Field Summary

Fields
Modifier and Type Field Description

protected double epsilon

protected double mass

protected double sigma
- Fields inherited from class etomica.units.systems.UnitSystem
  SIM

Fields
Modifier and Type	Field	Description
`protected double`	`epsilon`
`protected double`	`mass`
`protected double`	`sigma`

Constructor Summary

Constructors
Constructor	Description
`LJ()`	Constructs LJ unit system with default values of sigma, epsilon and mass each equal to unity.
`LJ(double sigma, double epsilon, double mass, boolean unicodeSymbols)`	Constructs LJ unit system with given values of sigma, epsilon, mass, given in simulation units.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`Unit`	`angle()`
`Unit`	`area()`
`Unit`	`charge()`
`Unit`	`current()`
`Unit`	`dipole()`
`Unit`	`energy()`
`Unit`	`force()`
`Unit`	`fraction()`
`double`	`getEpsilon()`
`double`	`getMass()`
`double`	`getSigma()`
`Unit`	`length()`
`Unit`	`mass()`
`Unit`	`power()`
`Unit`	`pressure()`
`Unit`	`quantity()`
`void`	`setEpsilon(double e)`
`void`	`setMass(double m)`
`void`	`setSigma(double s)`
`Unit`	`temperature()`
`Unit`	`time()`
`Unit`	`viscosity()`
`Unit`	`volume()`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from class etomica.units.systems.UnitSystem
baseUnits, luminousIntensity

- Field Detail
  - sigma
```
protected double sigma
```
  - epsilon
```
protected double epsilon
```
  - mass
```
protected double mass
```
- Constructor Detail
  - LJ
```
public LJ()
```
    Constructs LJ unit system with default values of sigma, epsilon and mass each equal to unity. Default uses unicode for symbols
  - LJ
```
public LJ(double sigma,
          double epsilon,
          double mass,
          boolean unicodeSymbols)
```
    Constructs LJ unit system with given values of sigma, epsilon, mass, given in simulation units. Unit classes can be used to convert to simulation units if needed. For example, if epsilon is given as epsilon/kB in units of Kelvin, the argument would take Kelvin.UNIT.toSim(epsilon).
    
    Parameters:
    
    sigma - LJ length parameter
    
    epsilon - LJ energy parameter
    
    mass - characteristic mass, nominally the mass of a LJ atom
    
    unicodeSymbols - if true, Unit symbols will be constructed using unicode expressions for sigma and epsilon and other symbols; otherwise substitutes are used.
- Method Detail
  - getSigma
```
public double getSigma()
```
    Returns:
    
    the LJ length parameter for this unit system
  - setSigma
```
public void setSigma(double s)
```
    Parameters:
    
    s - new value of the LJ length parameter to be used to define this unit system
  - getEpsilon
```
public double getEpsilon()
```
    Returns:
    
    the LJ energy parameter for this unit system
  - setEpsilon
```
public void setEpsilon(double e)
```
    Parameters:
    
    e - new value of the LJ energy parameter to be used to define this unit system
  - getMass
```
public double getMass()
```
    Returns:
    
    the LJ mass parameter for this unit system
  - setMass
```
public void setMass(double m)
```
    Parameters:
    
    m - new value of the LJ mass parameter to be used to define this unit system
  - quantity
```
public Unit quantity()
```
    Specified by:
    
    quantity in class UnitSystem
    
    Returns:
    
    unit defining an amount in this unit system, typically a direct count or a mole
  - fraction
```
public Unit fraction()
```
    Specified by:
    
    fraction in class UnitSystem
    
    Returns:
    
    unit defining a fractional amount in this unit system, typically a decimal or percent
  - mass
```
public Unit mass()
```
    Specified by:
    
    mass in class UnitSystem
    
    Returns:
    
    mass unit defined in this unit system
  - length
```
public Unit length()
```
    Specified by:
    
    length in class UnitSystem
    
    Returns:
    
    length unit defined in this unit system
  - time
```
public Unit time()
```
    Specified by:
    
    time in class UnitSystem
    
    Returns:
    
    time unit defined in this unit system
  - angle
```
public Unit angle()
```
    Specified by:
    
    angle in class UnitSystem
    
    Returns:
    
    angle unit defined in this unit system, typically radians or degrees
  - charge
```
public Unit charge()
```
    Specified by:
    
    charge in class UnitSystem
    
    Returns:
    
    electric-charge unit defined in this unit system
  - current
```
public Unit current()
```
    Specified by:
    
    current in class UnitSystem
    
    Returns:
    
    electric-current unit defined in this unit system
  - dipole
```
public Unit dipole()
```
    Specified by:
    
    dipole in class UnitSystem
    
    Returns:
    
    electric-dipole unit defined in this unit system
  - force
```
public Unit force()
```
    Specified by:
    
    force in class UnitSystem
    
    Returns:
    
    force unit defined in this unit system
  - energy
```
public Unit energy()
```
    Specified by:
    
    energy in class UnitSystem
    
    Returns:
    
    energy unit defined in this unit system
  - power
```
public Unit power()
```
    Specified by:
    
    power in class UnitSystem
    
    Returns:
    
    power (energy/time) unit defined in this unit system
  - temperature
```
public Unit temperature()
```
    Specified by:
    
    temperature in class UnitSystem
    
    Returns:
    
    temperature unit defined in this unit system
  - pressure
```
public Unit pressure()
```
    Specified by:
    
    pressure in class UnitSystem
    
    Returns:
    
    pressure unit defined in this unit system
  - volume
```
public Unit volume()
```
    Specified by:
    
    volume in class UnitSystem
    
    Returns:
    
    volume unit defined in this unit system
  - area
```
public Unit area()
```
    Specified by:
    
    area in class UnitSystem
    
    Returns:
    
    area unit defined in this unit system
  - viscosity
```
public Unit viscosity()
```
    Specified by:
    
    viscosity in class UnitSystem
    
    Returns:
    
    viscosity unit defined in this unit system

Class LJ

Nested Class Summary

Nested classes/interfaces inherited from class etomica.units.systems.UnitSystem

Field Summary

Fields inherited from class etomica.units.systems.UnitSystem

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Methods inherited from class etomica.units.systems.UnitSystem

Field Detail

sigma

epsilon

mass

Constructor Detail

LJ

LJ

Method Detail

getSigma

setSigma

getEpsilon

setEpsilon

getMass

setMass

quantity

fraction

mass

length

time

angle

charge

current

dipole

force

energy

power

temperature

pressure

volume

area

viscosity