Investigatory Project Physics Essay Example for Free

Investigatory Project Physics Essay The objective: The objective was to see which colored jars had the highest emissivity (or absorbed heat the fastest) which colors radiate heat the fastest by performing independent tests for heating cooling the colored jars. Methods/Materials Nine of the 10 small jars were painted on the outside with different colors of enamel paint. The 10th jar was used as the control variable. For the heating testing, the colored jars were divided into 3 groups. Group 1: red, blue, yellow; Group 2: gold, silver, black; Group 3: white, green, purple. Each jar started with 80 mL of 24 degree C tap water. The worklight had 2 high-powered lights of 500 watts each and 4 jars were tested at a time (each group was tested 1 at a time; one jar always being the control) for a total of 3 tests for 1 heating trial. There were 2 jars per light, both 20 cm from the light and 3 cm from each other. The 4 jars each had calibrated glass thermometers in them to monitor the water temps. A foil wall was put between the 2 lights to keep light heat from affecting the other lights jars. The temps were checked every 10 min. for a 100-min. period and recorded. For the cooling trial, 59 degree C water was poured into the 10 jars. The temps were checked and recorded the same way as the heating trial. Results The green jar heated the fastest with its temp rising to 63 degrees C at the end of the period. Blue followed with 59 degrees C. Black was near average, with 52 degrees C. Gold stayed coolest with 41 degrees C. All colors cooled at almost the same rate but Black always had the coolest temp compared to the other jars. Conclusions/Discussion The hypothesis was incorrect in the heating trial, but was supported in the cooling trial. During research a picture of the visible spectrum was found, showing blue and green with the thickest bonds. Maybe thats why the blue and green jars heated the fastest appeared to have the highest emissivity. The black jar cooled the quickest maybe because its color had the jar absorb the heat from the water. Green appeared to have the highest emissivity. It may be linked to why chlorophyll is green. If the colored jars were placed under a light source, the darkest color of the set would heat the fastest (or have the highest emissivity); if all colored jars were cooled from the same temperature, the darkest would cool the fastest.

Essay --

1. Introduction The aim of this report was to discuss how the climate change and urbanisation processes affected the design and management of wastewater systems in one of the countries of choice. In this report as an example China was used to describe the influence of urbanisation and climate change on design and management of wastewater systems. Rapidly growing human population is expected to exceed nine billion people by 2050. Urban areas in developing countries are affected by rapid growth of population and poor infrastructure development. Already half of the human population live in cities where the infrastructure is not developed enough to sustain wastewater production. As the population increases so the production of waste water. In addition, climate changes affect the weather patterns, which directly influence a hydrological cycle. As a result one area suffers from rain fall shortage and others from more intense rainfalls. 2. China In recent decades, China’s population has rapidly grown which caused rapid economic growth and increased the rate of urbanisation. At present china has one of the fastest urban population growth rate in the world.(UNDP 2013) All this happened along with proceeding environmental destruction and serious water pollution. The growing population of China has a high water demand as well as a lack of sufficient wastewater infrastructure. Those factors result in poor water quality and severe water shortages. In 2002 the rate of municipal wastewater treatment in China was 39.9 percent. (U.S Department of commerce 2005) Figure 1 Urbanisation and the urban population in China (CEIC 2012) â€Å"Macroeconimic Database for emerging and development markets. (source:www.stats.gov.ch) Water resources and water c... ...ns Benefit/cost analysis Environmental Impact Legal mandates 7. Develop implementation plans, including timeframe for implementation 8. Monitor and reassess Source: ( Rosenzweig et al. 2007 ). Figure 6 Conceptual model of a sustainable water resource system (source Hecht et al.2012) 5. Conclusion High rates of urbanisation and climate change in China has created many problems related to water resources. An increase in the population and a high urbanisation rate have effected and increased wastewater production. The Chinese water market is already under a huge amount of stress. The quality and quantity of water resources have been depleted due to the inefficient use of water. In terms of wastewater management China requires a long term strategy with sustainable solutions which will take into account climate change and the rate of urbanisation.

Family Background of Edgar Sia Essay

1. * Electronic Controller uses electrical signals and digital algorithms to perform its receptive, comparative and corrective functions. is best suited for applications where large load changes are encountered and/or fast response changes are required. Trerice Electronic Controllers have full auto tuning and PID capabilities, and offer a host of available options, including user selectable inputs and ranges, outputs, setback functions, and alarms. An economical â€Å"on/off† only style is also available for simple control applications. * Electromechanical controller is a type of traffic signal controller. Despite the fact that computerized traffic signal controllers have dominated the world of traffic signal control, electromechanical traffic signal controllers are still in existence. Electromechanical controllers have been in existence for over 60 years, and they are interesting in many ways, such as how they operate, for example. An electromechanical controller is solely operated by electrical relays. Electrical relays are what provide electrical currents to the important parts that are responsible for controlling the indications of a traffic signal that the electromechanical traffic signal controller is wired to * ELECTRICAL CONTROLLER For actuating a number of electrical devices in accordance with control inputs received from a number of control input sources includes a number of optical isolators having inputs coupled to the control input sources. The optical isolators function to electrically isolate each of the control input sources from each other and to provide individual control voltages corresponding to the control inputs received from the control input sources. The outputs of the optical isolators are coupled through a user-actuable matrix switch to the coils of a number of relays which, in turn, control the electrical devices. Through various settings of the matrix switch, various ones of the electrical devices can be actuated in response to control inputs received from particular ones of the control input sources. Electrical isolation is maintained among the control input sources to avoid the development of undesirable feedbacks to the non-actuated control input sources. * Mechanical Controllers combine sensors, logic, and actuators to maintain the performance of components of a machine. Perhaps the best known is the flyball governor for a steam engine. Examples of these devices range from a thermostat that as temperature rises opens a valve to cooling water to speed controllers such the cruise control system in an automobile. The programmable logic controller replaced relays and specialized control mechanisms with a programmable computer. Servomotors that accurately position a shaft in response to an electrical command are the actuators that make robotic systems possible. 2.) * Motor control * PWM controller * DC-DC controller * Switched mode power supply a) SWITCH is an electrical component that can break anelectrical circuit, interrupting the current or diverting it from one conductor to another.[1][2] The most familiar form of switch is a manually operated electromechanicaldevice with one or more sets of electrical contacts, which are connected to external circuits. Each set of contacts can be in one of two states: either â€Å"closed† meaning the contacts are touching and electricity can flow between them, or â€Å"open†, meaning the contacts are separated and the switch is nonconducting. The mechanism actuating the transition between these two states (open or closed) can be either a â€Å"toggle† (flip switch for continuous â€Å"on† or â€Å"off†) or â€Å"momentary† (push-for â€Å"on† or push-for â€Å"off†) type. A switch may be directly manipulated by a human as a control signal to a system, such as a computer keyboard button, or to control power flow in a circuit, such as a light switch. Automatically operated switches can be used to control the motions of machines, for example, to indicate that a garage door has reached its full open position or that a machine tool is in a position to accept another workpiece. Switches may be operated by process variables such as pressure, temperature, flow, current, voltage, and force, acting assensors in a process and used to automatically control a system. For example, a thermostat is a temperature-operated switch used to control a heating process. A switch that is operated by another electrical circuit is called a relay. Large switches may be remotely operated by a motor drive mechanism. Some switches are used to isolate electric power from a system, providing a visible point of isolation that can be padlocked if necessary to prevent accidental operation of a machine during maintenance, or to prevent electric shock. An ideal switch would have no voltage drop when closed, and would have no limits on voltage or current rating. It would have zero rise time and fall time during state changes, and would change state without â€Å"bouncing† between on and off positions. Practical switches fall short of this ideal; they have resistance, limits on the current and voltage they can handle, finite switching time, etc. The ideal switch is often used in circuit analysis as it greatly simplifies the system of equations to be solved, however this can lead to a less accurate solution. Theoretical treatment of the effects of non-ideal properties is required in the design of large networks of switches, as for example used in telephone exchanges. b) RELAY is an electrically operated switch. Many relays use an electromagnet to operate a switching mechanism mechanically, but other operating principles are also used. Relays are used where it is necessary to control a circuit by a low-power signal (with complete electrical isolation between control and controlled circuits), or where several circuits must be controlled by one signal. The first relays were used in long distance telegraph circuits, repeating the signal coming in from one circuit and re-transmitting it to another. Relays were used extensively in telephone exchanges and early computers to perform logical operations. A type of relay that can handle the high power required to directly control an electric motor or other loads is called a contactor. Solid-state relays control power circuits with no moving parts, instead using a semiconductor device to perform switching. Relays with calibrated operating characteristics and sometimes multiple operating coils are used to pro tect electrical circuits from overload or faults; in modern electric power systems these functions are performed by digital instruments still called â€Å"protective relays†. c) COIL is formed when a conductor (usually an insulated solid copper wire) is wound around a core or form to create an inductor or electromagnet. When electricity is passed through a coil, it generates heat. One loop of wire is usually referred to as aturn, and a coil consists of one or more turns. For use in an electronic circuit, electrical connectionterminals called taps are often connected to a coil. Coils are often coated with varnish or wrapped with insulating tape to provide additional insulation and secure them in place. A completed coil assembly with taps is often called a winding. A transformer is an electromagnetic device that has aprimary winding and a secondary winding that transfers energy from one electrical circuit to another by inductive coupling without moving parts. The term tickler coil usually refers to a feedback coil, which is often the third coil placed in relation to a primary coil and secondary coil. A coil tap is a wiring feature found on some electrical transformers, inductors and coil pickups, all of which are sets of wire coils. The coil tap(s) are points in a wire coil where a conductive patch has been exposed (usually on a loop of wire that extends out of the main coil body). As self induction is larger for larger coil diameter the current in a thick wire tries to flow on the inside. The ideal use of copper is achieved by foils. Sometimes this means that a spiral is a better alternative. Multilayer coils have the problem of interlayer capacitance, so when multiple layers are needed the shape needs to be radically changed to a short coil with many layers so that the voltage between consecutive layers is smaller (making them more spiral like).

The Theorist I Choose For This Paper That I Believe I Relate

The theorist I choose for this paper that I believe I relate to the most is Erik Erikson. Erik Erikson is best known for his theory on identity, which was a theory that was broadened from Sigmund Freud while retaining its core work (Schultz, D. Schultz, S., 2013). Erik Erikson’s mother, who was Jewish, became pregnant but a man that was not her husband after her husband’s disappearance. She was sent to Germany, where she gave birth to Erik. Erik Erikson grew up believing his pediatrician was his biological father due to his mother marrying this man. Since Erik Erikson researched the impact of identity and personality, it is not a shock that he has experiences identity crisis’, such as his name and psychological identity. At the age of†¦show more content†¦Each stage has age ranges, but also basic strengths and adaptive versus maladaptive ways of coping with everyday life. I agree that at each stage the life of an individual experiences different feeling s and that each stage comes with a feeling of hope. For example, in the oral-sensory stage, which is birth to one years old, babies experience trust versus distrust and the feeling of hope. Babies know that if they cry, they will get attention. They know that if they are in a familiar person’s arms, they will be cared for. If these things do not happen, the baby experiences distrust, but continue to be hopeful that they will be nurtured. The second stage is the muscular-anal stage, which ranges from age one to tree. During this stage toddlers are dealing with autonomy versus doubt with a strength of will. The third stage ranges from age three to fix, the fourth stage ranges from ages six to eleven, and the fifth stage ranges from age twelve to eighteen. The sixth stage is young adulthood, which ranges from age 18 to 35. During this stage, young adults are experiencing intimacy versus isolation with the strength of love, overall. Intimacy can lead to love, but love many also l ead to isolation in many cases. The last two stages are adulthood that range from age 35 to 55, and the last stage being maturity to old age that is 55 years and older. The way Erik Erikson researched theseShow MoreRelatedThere Is Much To Be Said About The Various Theoretical1211 Words   |  5 Pagesdeveloped by educational theorists whose aim at its core is to find work argue which is the best approach for teachers to apply towards the development of children’s learning. In this paper, I will present a brief analysis of six contemporary educational theories: perennialism, essentialism, reconstructivism, progressivism, educational humanism, and behaviorism. 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