Introduction To What Is A Hammer Mill Engineering Essay

Introduction To What Is A Hammer Mill Engineering Essay It is a machine used to shred material into fine particles (size reduction). They have many sorts of applications in many industries, including: Milling grain, Ethanol plants (corn), Grinding used shipping pallets for mulch, Sawmills, size reduction of trim scrap and planer shavings into boiler fuel or mulch, A farm machine, which mills grain into coarse flour to be fed to livestock. Operation The principle of hammermill is straightforward. A hammermill is a steel drum containing a vertical or horizontal rotating shaft or drum on which hammers are mounted. The hammers are free to swing on the ends of the cross, or fixed to the central rotor. The rotor is spun at a high speed inside the drum while material is fed into a feed hopper. The material is impacted by the hammer bars and is thereby shredded and expelled through screens in the drum of a selected size. Hammer mill apple shredder for juicing. Small grain hammermills are operated on household current. Large automobile shredders could use one or more 2000 horsepower (1.5 MW) diesel engines to power the hammermill. The Screenless hammer mill uses air flow to separate small particles from larger ones. It is designed to be more reliable, much cheaper more energy efficient than regular hammermills. In the feed processing process there may be a number of ingredients that require some form of processing. These include coarse cereal grains, corn that requires particle size reduction which will improve the ingredient performance increase the nutritive value. One of the methods to achieve this particle size reduction is using hammer-mills. Both hammering and rolling can achieve the desired result of achieving adequately ground ingredients, but other factors also need to be looked at before choosing the suitable method to grind. Excessive size reduction can lead to wasted electrical energy, unnecessary wear on mechanical equipment and possible digestive problems in livestock and poultry. For more in depth information regarding what actually occurs to the ingredients during size reduction please refer to this link: particle size reduction.    Mechanism of action: Hammer mills reduce the particle size of materials by impacting a slow moving target, such as a cereal grain, with a rapidly moving hammer. The target has low kinetic energy, whereas the hammer has high kinetic energy. The transfer of energy resulting from the collision fractures the grain into many pieces. Since impact is the primary force used in a Hammer mill to reduce the size of the particles, so, whatever increases the chance of a collision between a hammer and a target, increases the magnitude of the collision, would be an enhancer to particle size reduction. Particles produced using a hammermill are spherical in shape with a polished surface. A wide variation in the particle size distribution would occur where there will be some large-sized and many small-sized particles. Advantages: being to produce a wide range of particle sizes suitable for friable material and fiber easy to use lower cost when compared with a roller mill easy to maintain particles produced are spherical, with a surface that appears polished. Disadvantages: Less energy efficient than roller mill May generate heat so considered as a source of energy loss. Greater particle size variability (less uniform) Noisy generate dust pollution General Design The major components of these hammermills, include: A delivery device: used to introduce the material to be ground into the path of the hammers. A rotor comprised of a series of machined disks mounted on the horizontal shaft performs this task. Free-swinging hammers that are suspended from rods running parallel to the shaft and through the rotor disks. The hammers carry out the function of smashing the ingredients in order to reduce their particle size. A perforated screen and either gravity- or air-assisted removal of ground product. Acts to screen the particle size of the hammer mill to ensure particles meet a specified maximum mesh size. Feeder design Materials are introduced into the paths of the hammers by a variable speed vein feeder. This type of feeder can have its motor slaved by a programmable controller to the main drive motor of the hammer mill. The operational speed of the feeder is controlled to maintain optimum amperage loading of the main motor. Hammer design and configuration The design is determined by operating parameters such as rotor speed, motor horsepower, open area in the screen. Optimal hammer design provides maximum contact with the feed ingredient. Hammer mills in which the rotor speed is approximately 1,800 rpm, should be using hammers which are around 25cm (~ 10 inches) long, 6.35cm (~2.5 inches) wide, 6.4mm (0.25 inches) thick. A rotor speed of about 3,600 rpm, hammers should be 15 to 20 cm (~ 6-8 inches long, 5 cm (~ 2 inches) wide, 6.4 mm (0.25 inches) thick. The number of hammers used for a hammer mill of 1,800 rpm, should be 1 for every 2.5 to 3.5 horsepower, and for 3,600 rpm, one for every 1 to 2 horsepower. Hammers should be balanced on the rods so that they wonà ¢Ãƒ ¢Ã¢â‚¬Å¡Ã‚ ¬Ãƒ ¢Ã¢â‚¬Å¾Ã‚ ¢t trail one another. The distance between hammer and screen should be 12 to 14 mm (~ 1/2 inch) for size reduction of cereal grains. The velocity is important for proper size reduction. Tip speed is the speed of the hammer at its furthest edge(tip) from the rotor, and is calculated by : Range of tip speeds seen in hammermills is commonly in the range between 5,000 and 7,000 m/min (~ 16,000 and 23,000 feet per minute). When the tip speeds exceed 23,000 feet per minute, consideration must be given to the design of the hammer mill, the materials used, and the fabrication of components. Changing the rotational speed of the drive source is not a recommended method of increasing hammer speed in excess of 23,000 feet per minute. The primary force used in hammermill is the impact, which increases the chance of a collision between a hammer and a target provides an advantage in particle size reduction. The magnitude of the collision is increased by increasing the speed of the hammers. Screen Design The amount of open area in a hammer mill screen controls the particle size and grinding efficiency. The screen must be designed to provide the greatest amount of open area. Recommended ratio for grains would be 55 cm2 (~ 8-9 inches square) per horsepower (Bliss, 1990). The removal of sized material from a hammermill is a critical design feature. Proper output of material affects not only the efficiency of operation, but also particle size. When the correct ratio of screen area to horsepower is used and proper distance between hammers and screen face is maintained. Excessive size reduction is anti-productive. Energy is wasted in the heat production, throughput is restricted, resulting in the particles becoming too small. Most newer hammermills are equipped with an air-assist system that draws air into the hammer mill with the product to be ground. Systems are designed to provide reduced pressure on the exit side of the screen to disrupt the fluidized bed of material on the face of the screen, thus allowing particles to exit through screen holes. Some full circle hammer mills are designed so the screen is in two pieces. It is possible to use a larger hole size on the upward arc of the hammers to further reduce the amount of material on the face of the screen.    Hammer Mill Perforated Screens Hammer mills screens are used inside a hammer mill to seperate particle sizes. Particle of small diameter that has been grinded by the hammer mill passes through the screen and leaves the hammer mill with the aid of the pneumatic system. Application: Hammer Mills Uses and Advantages in Grinding Oil Seeds Other Materials Availability Hammer Mills are known as the best grinding machine for all kinds of material, besides oil seeds. A wide assortment of highly developed and advanced Hammer Mills / Disintegrators are available in the market today. They are fabricated to have a strong and sturdy body and are also available in different types, size, and capacities. These come with automatic controls, which makes the machines very easy to use. The number of hammers can also be customized as however the user requires it. Its use increases the output by a large quantity, thus saving more time and energy. Oil Seeds Grinding Grinding of seeds with Hammer Mills increases the quality level of the seeds. Some of the seeds that can be grinded and disintegrated using Hammer Mills are as follows: Cotton seeds Ground nuts Copra Soybeans, etc. Advantages of Using Hammer Mill in oil seed grinding: * Efficient grinding at the shortest time. * Time and Effort saving. * Less electricity power consumption. * Available in different capacities sizes. * Very low maintenance. Conclusion: Hammer Mill is the most common equipment used for the purpose of particle size reduction. It has wide scale of applications in grinding seeds, nuts, and beans and other materials for more industrial purposes. It has the advantage of High efficacy in the shortest time. Thus, considered time saving and less consuming for the human efforts. Beside the low energy consumption, high availability and ease of use and maintenance. It has some drawbacks the most important of which are energy loss, less uniform product and being noisy dust polluting. Its mechanism of action had been explained above in details that it acts to reduce the size of the particles, so, whatever increases the chance of a collision between a hammer and a target, increases the magnitude of the collision, would be an enhancer to particle size reduction.

Plato, Descartes, and The Matrix Essay

The Matrix movie had many similarities with the readings from Plato and Descartes. All three discussed the scenario in which reality was discovered to be a non-reality. Specifically, in The Matrix, reality that was experienced by multitudes of people is actually a computer simulation called â€Å"The Matrix†. This is actually a deviation from the Plato and Descartes readings in that computers were not mentioned or available at the time of those writings. Plato (380 BC) speaks of people having their â€Å"legs and necks fettered from childhood†, while a source of the restraint is not specifically mentioned, it is most certainly a physical restraint as opposed to the material, computer generated reality as described in The Matrix movie. Descartes was the only one of the three situations that contemplated God in the various reality verses truth contemplations. Plato speaks to the initial shock of discovering that known reality is actually a lie and goes on to speak of the resulting repercussions of this discovery. The denial of the true reality is so tangible that the people in the described scenario would rather believe that the lie was real than to believe and accept what they were actually experiencing. In The Matrix movie (1999) Morpheus asks â€Å"Have you ever had a dream, Neo, that you were so sure was real?† Similarly, Descartes (1641) also contemplates how often he dreamt that he was in familiar circumstances, dressed and by a fire, only to realize that he was undressed and lying in bed. Plato, Descartes, and The Matrix are all similar in that they consider people living in a world that they discover is not real and that they exist in perceived delusions that produce resulting anti-realities. The Matrix movie is parallel to the Descartes reading in that they both examine our senses as sources of realities. Descartes contemplates how our senses occasionally mislead us  whereas The Matrix describes a continual sensual overhaul which is controlling our mind and ultimate realities while our bodies lay dormant. In The Matrix movie Neo never expresses happiness over his liberation from the computer program but he does feel the need to liberate those still living under the control of the computer program. In contrast, the Plato reading describes and expresses a feeling of joy that would be experienced after emerging from the controlled reality. Can we prove the world we are experiencing is real? In order to contemplate how we know that our current state of being is real we must first decide what â€Å"real† is to us. What is reality? In my opinion, reality is what we see, hear, smell, feel and taste in the present. Reality is what is occurring to us right now, this very second. Is what is happening to us, the world we are experiencing, real and can we prove that it is real? How do we know we are not dreaming? It has been my experience that dreams do not produce anything but thoughts and visions. I do not feel, taste or smell while dreaming. Therefore I can prove that the world I am currently experiencing, while I type this essay, is real because I can feel the keyboard that I am typing on and I can taste and smell the coffee that I am drinking. Which is better: the harshness of reality or the â€Å"ignorance is bliss† of illusion? In my opinion, the harshness of reality is a far better state than the â€Å"ignorance is bliss† illusion. I believe this to be true because I believe that true depth of character cannot be achieved without experiencing the full harshness of reality. How can our intellects and philosophies be explored without experiencing the full range of life events? If you lived your life in ignorance then the world you experienced would skew the thoughts you pondered while excluding the full range of contemplations, restricting them to a bliss-filled reality. With intelligence comes a plethora of knowledge, both good and bad. Conclusion In conclusion, through the viewing of The Matrix and the reading of both Plato and Descartes, we can see that all three bring to mind many philosophical questions related to actual and perceived reality. Obviously, it is very fascinating to imagine a world where alternative and controlled  realities are possible and even very real. The truth is sometimes stranger than fiction and, in my opinion, The Matrix and the thoughts contemplated by Plato and Descartes are just stories that will never be reality. I believe that my Christian worldview is such that would prevent me from ever believing any different. While all of the situations explored were interesting, they will remain, in my mind, fantasies. References Plato. (380 BC). â€Å"The Allegory of the Cave.† In The Republic (Book VII, 514A1 – 518D8). Descartes, R. (1641). Meditation I of The Things of Which We May Doubt. In Meditations on First Philosophy. Wachowski, Andy, and Lana Wachowski. The Matrix. Directed by Andy Wachowski and Lana Wachowski. Los Angeles: Warner Bros. Pictures, 1999.

Medical Records and the Implementation of Health Informatics

Introduction Health Informatics or Medical Informatics is the intersection of information science, computer science, and health care. Health Informatics offers resources, devices, and methods required to optimize the acquisition, storage, retrieval, and use of information in health and biomedicine. The applicable areas would be nursing, clinical care, dentistry, pharmacy, public health, and bio medical research. Electronic health information systems are the science that addresses how to use information to improve health care. This paper will present the concept of electronic health records (EHRs) and the current developments and analysis of the transition and implementation of health informatics in health care organizations†¦show more content†¦Electronic health records only allow access to the required information from authorized personnel. Electronic Records and Physicians The evolution of health care informatics developed in four stages. The development of bioinformatics the first stage, in the 1950s, medical informatics was the second stage in the 1960s, public health informatics, the third stage in the 1990s also consumer health informatics, the fourth stage in the 1990s. In the first stage of health care informatics, Robert Ledley was the first to use a computer for health purposes at the National Bureau of Standards, to study dental projects. The field of Health Informatics collects data from a variety of patients, and uses that information to create successful patient care. Health Informatics is a combination of computer sciences, communication technologies, biological, and cognitive sciences to address today’s health care problems utilizing data management, analysis, and transmission. Dental hygienists handle vast amounts of data in clinical practice. There are new techniques/products that they read about on the Internet, and they ask if this particular treatment would be of benefit. On the other side of the equation, we find that dental hygienists are using the Internet to search for the same types of information. However, being bombarded with a plethora of information from both sides of the spectrum, howShow MoreRelatedEvolution of Healthcare Informatics893 Words   |  4 Pagesadmittedly simplistic method of storing and accessing this vital medical information: a paper chart, pencil, and clipboard. While scrawling a diagnostic conjecture or the result of blood test on a patients official medical record sufficed until the dawn of the computing age, with the advent of mainframe databases in the early 1960s, digital data storage in the late 1990s, and cloud computing today, the concept of healthcare informatics has emerged to enable nurses, physicians, pharmacists, and otherRead MoreKey Functional Areas of Nursing Informatics1562 Words   |  6 PagesNursing informatics Key functional areas of nursing informatics There are 9 key functional areas of nursing informatics. These areas describe integrated functions of nurses, and cross from clinical practice to the informatics end. ADDIN EN.CITE Zerwekh2006267Zerwekh (2006)2672676Zerwekh, J. Claborn, J.C. Nursing today: transition and trends5th2006St. Louis, MOSaunders Elsevier HYPERLINK l _ENREF_8 o Zerwekh, 2006 #267 Zerwekh (2006) also states that nurses may also focus primarily on oneRead MoreHealth Information Technology And The Health Care Industry Essay1458 Words   |  6 PagesHealth information technology, also known as H.I.T, is an area of IT that involves the development and maintenance of information for the health care industry. This technology allows for healthcare information systems to be automated and interoperable, which leads to improved medical care, lower costs and increased efficiency. Some H.I.T. professions include: clinical data analyst, CMIO and nursing informaticist. A clinical data analyst develops, designs and man ages data tracking systems and evaluatesRead MoreLegal, Ethical, And Policy Issues1392 Words   |  6 Pages Legal, Ethical, and Policy Issues, Oh My! Julia Colasurdo SUNY College of Technology at Alfred State Abstract Legal, ethical, and policy issues are an important aspect of nursing and medical informatics. Nurses should be aware of the dilemmas facing the use of informatics in the health care facilities. It is important to note the legal issues facing nursing because of the charges of negligence that can be incurred on the nurse if not aware. Ethical dilemmas of privacy including securityRead MoreElectronic Medical Records and the Nurse Informatics Specialist914 Words   |  4 PagesElectronic medical records and the nurse informatics specialist Over the years, with the technological development and digitalization of almost all the processes, there have been calls for the healthcare technology to be adopted in a wider sense of it. This has been mainly on the development of the appropriate chip and other electronic storage systems that can hold the information about each Americans medical information and any other relevant data like the physical address and the migration trendRead MoreEssay about Informatics In The Healthcare Industry1647 Words   |  7 PagesInformatics in the Clinical Area Informatics has affected many areas of the medical field. Informatics has improved the field by â€Å"helping people to revisualize and redesign their information management and knowledge management skills and learn new ways of using clinical data to mange clinical practice and patient care† (McLane Turley, 2011). The purpose for this paper is to explore informatics in streamlining paperwork, provide decision support tools, and review contribution that is made towardsRead MoreHealthcare Ecosystems1442 Words   |  6 Pages1. State Health Information Exchange Cooperative Agreement Program The State HIE program falls under The Health Information Technology for Economic and Clinical Health (HITECH) Act, and funds the implementation and creation of statewide health information exchange. States can work independently to complete the task, or they can combine their finances and work together on a multi-state program. The awardees have the important job of creating and putting into action a State plan that makes sureRead MoreIs Bioinformatics A Multi Disciplinary Field?1203 Words   |  5 Pagesinvolves health information technology to improve the efficacy of health care by incorporating better quality, efficient and new technologies. Health informatics is an amalgamation of various disciplines like information science, computer science, social science, management science, behavioral science and others. There are various sub categories in health informatics like the â€Å"clinical informatics, pathological informatics, pharmacy informatics, public health informatics, c ommunity health informaticsRead MoreTaking a Look at Medical Informatics1237 Words   |  5 PagesMedical informatics are sketchily explained as the applied science at the interconnection of the disciplines of medicine, business, information technology, and consumer centered care, which is contributory for substantial and measurable developments in both healthcare quality and cost-effectiveness. Informatics is a compilation of tools, resources, and methods to enhance greater intelligence in use in regards to the latest evidence and knowledge within health and medicine. Computers and informationRead MoreIntroduction To Health Informatics Course Has Provided A Broad Range Of Health Information1051 Words   |  5 PagesReflection Paper The Intro to Health Informatics course has provided a broad range of health information that introduces the core concepts in the biomedical community. Throughout this course, my learning experience in health informatics has advance, for I was able to learn a list of materials including: the relationship of biomedical informatics and its related field; the roles of informatics in decision support systems and related health IT applications; and the importance of biomedicine and the

Spanish Indirect-Object Pronouns

Spanish verbs can be accompanied by direct and indirect objects. A direct object is the noun or pronoun that the verb acts directly on, while an indirect object is the person affected by the action but not acted directly upon. So in a sentence such as I see Sam, Sam is the direct object of see because Sam is the object that is seen. But in a sentence such as I am writing Sam a letter, Sam is the indirect object. The item being written is letter, so letter is the direct object. Sam is the indirect object as one who is affected by the verbs action on the direct object. Spanish Differentiates Betweem Direct and Indirect Objects If youre learning Spanish, the distinction can be important to make because Spanish, unlike English, sometimes uses different pronouns for direct and indirect objects. It is also important to note that many Spanish sentences use indirect-object pronouns where a different construction is used in English. For example, me pintà ³ la casa would typically be translated as he painted the house for me. In fact, one sign of an indirect object in English is that it usually can be understood, to use me as an example, as for me or to me. For instance, he bought her the ring is the same as he bought the ring for her. In that first sentence, her is an indirect object. (The Spanish equivalent would be à ©l le comprà ³ el anillo.) Here are the indirect-object pronouns along with their English equivalents and examples of their uses: me — me — Juan me da una camisa. (John is giving me a shirt.)te — you (singular familiar) — Juan te da una camisa. (John is giving you a shirt.)le — you (singular formal), him, her — Juan le da una camisa a usted. (John is giving you a shirt.)  Juan le da una camisa a à ©l.  (John is giving him a shirt.)  Juan le da una camisa a ella.  (John is giving her a shirt.)nos — us — Marà ­a nos da unas camisas. (Mary is giving us some shirts.)os — you (plural familiar) — Marà ­a os da unas camisas. (Mary is giving you some shirts.)les — you (plural formal), them — Marà ­a les da unas camisas. (Mary is giving you some shirts, or Mary is giving them some shirts.) Note that the direct-object and indirect-object pronouns are identical in the first and second persons. Where they differ is in the third person, where the only indirect objects (except in what is usually considered substandard speech) are le and les. Using Indirect Objects in Special Cases As some of the above examples indicate, an indirect-object pronoun is used whenever a sentence includes an indirect object, even though a pronoun might not be used in English. A further clause can be added for clarity or emphasis, but, unlike in English, an indirect pronoun is the norm. For example, le escribà ­ could mean I wrote to him, I wrote to her or I wrote to you, depending on the context. To clarify, we can add a prepositional phrase, as in le escribà ­ a ella for I wrote to her. Note that le is still typically used, even though a ella makes it redundant. Both direct- and indirect-object pronouns are typically placed before conjugated verbs, as in the above examples. They can be (but dont have to be) attached to infinitives and present participles: Te voy a escribir una carta and voy a escribirte una carta (I am going to write you a letter) are both correct, as are le estoy comprando un coche and estoy comprà ¡ndole un coche (I am buying him a car). In commands, direct and/or indirect objects are attached to affirmative commands but precede negative commands. Escrà ­beme (write me), but no me escribas (dont write me). Note that in affirmative commands and when attaching an object to a present participle, attaching the object at the end of the verb can result in an orthographic accent being needed to keep the stress on the correct syllable. If you have a direct object and an indirect object with the same verb, the indirect object comes first. Te las escribo. (I am writing them to you.) Sample Sentences Using Indirect-Object Pronouns Indirect objects are shown in these sentences in boldface. Object pronouns in regular type are direct objects or objects of prepositions. No le voy a dar el gusto a nadie de vencerme tan facilmente. (I am not going to give anyone the pleasure of defeating me so easily. A nadie is a redundant phrase; le remains necessary. The -me of vencerme is a direct object.) ¿Nunca me has visto beber algo mà ¡s que una copa de vino? (Have you never seen me drink more than one cup of wine? Beber here is an infinitive acting as a direct object.)Le construyeron un gimnasio para que pudiera ejercitarse. (They built him/her a gymnasium so he/she could exercise. Note that the indirect object here can apply to both males and females.)Queremos decirle a ella que ella forma gran parte de nuestras vidas. (We want to tell her that she makes up a big part of our lives. Que and the words following function as a direct object.)