Dissolving Salt in Water Chemical or Physical Change

When you dissolve table salt (sodium chloride, also known as NaCl) in water, are you producing a chemical change or a physical change? A physical change results in a change of the materials appearance, but no new chemical products result. A chemical change involves a chemical reaction, with new substances produced as a result of the change. Why Dissolving Salt Would Be a Chemical Change When you dissolve salt in water the sodium chloride dissociates in Na ions and Cl- ions, which may be written as a chemical equation: NaCl(s) → Na(aq) Cl-(aq) Therefore, dissolving salt in water is an example of a chemical change. The reactant (sodium chloride or NaCl) is different from the products (sodium cation and chlorine anion). Thus, any ionic compound that is soluble in water would experience a chemical change. In contrast, dissolving a covalent compound like sugar does not result in a chemical reaction. When sugar is dissolved, the molecules disperse throughout the water, but they dont change their chemical identity. Why Some People Consider  Dissolving Salt a Physical Change If you search online for the answer to this question, youll see about equal numbers of responses arguing that dissolving salt is a physical change as opposed to a chemical change. The confusion arises because one common test to help distinguish chemical and physical changes is whether or not the starting material in the change may be recovered using only physical processes. If you boil the water off of a salt solution, youll obtain salt.

The Music Industry And Mass Media - 2807 Words

The media has placed unfortunate stereotypes on many races, ethnicities, and cultures. This playlist that is being analyzed through a multiperspectival lens has an overall theme that women are objectified and mistreated in the music industry, especially in the hip-hop genre. In the readings and documentaries we have watched from class, there has been a common theme of mistreating women through music and this is important because it is becoming more and more acceptable in today’s society of accepting misogyny in music lyrics. The music industry and mass media confirms that being a woman in contemporary society means one needs to use their femininity to be successful in both the public and private spheres of life, therefore society is still looking through a patriarchal lens and does not extensively accept a successful women and female in the music industry in a positive way in our culture. Most of the time, when major label companies are looking for the next best thing in the music industry, they are not actually looking for someone who has real talent per se, but someone who is going to make them money, even if it means that misogyny, violence, or homophobia will be promoted and normalized in their music. For example, Tinashe, performs â€Å"2 On†, this was her first hit to reach the radio and the masses, this song launched her career surprisingly because she does sing about her own desires but no surprisingly her lyrics ultimately are driven to please men. Even though Tinashe’sShow MoreRelatedThe Issues Arising From File Sharing1728 Words   |  7 Pagesand businesses. The communication and media platforms were on the frontline in embracing the new technology. The internet is currently the largest source of music and video content. 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Obedient. Ditzy. Perfect. Submissive. This is how women are portrayed is this how women really are? Mass media is always sending out messages of how women should act, look, and think. Mass media portrays women in many fictitious ways. Women are frequently seen as sexual objects in order to sell things, attract others, for entertainment and a variety of other things. Many female celebrities such as models, actors, and singers are very slimRead MoreMass Media and Popular Culture1367 Words   |  6 PagesHow has mass media a created a relationship among popular culture, mass media and different forms of dissemination? Mass media is any form of communication used to reach a large group of people. There are different types of media; examples of media are magazines, movies, television, books, recording devices, radio and the internet. As time goes on, new and improved technology is developed in the mass media industry for communicating and entertainment purposes. As mass media continues to grow andRead MoreDialectic Of Enlightenment By Theodor Adorno1243 Words   |  5 PagesIn his wor k, Dialectic of Enlightenment, Theodor Adorno analyzes the nature of the culture industry. People everywhere are constantly being consumed by the culture industry, which is a term for the mass production of cultural goods such as films, magazines, and music. Adorno is concerned that the government uses the cultural industry as a way to deceive the masses and manipulate them into passivity. This idea remains true in today’s society. Young men and women are more interested in the releaseRead MoreThe Impact Of Digital Music On The Music Industry896 Words   |  4 Pagesdownloads. Threatening the survival of the music industry and introducing a unique set of challenges for the industry to overcome. To remain relevant in the new global market of digital music online, the music industry would have to evolve and change with the introduction of each new facet technology had to offer. The introduction of digitally compressed music files, so easily attainable for a small fee or down loaded legally (pirated) for free, made the music industry reevaluate how to make a profit andRead MoreStrategic Analysis Of Sonic Records Employee Compensation1545 Words   |  7 Pagescompensation system and their recently added online on-line music warehouse and distributor E-Sonic. By creating this strategic analysis there becomes a pathway to make informed decisions on employee compensation strategies at all levels of E-Sonic. Having this detailed concise report helps provide paramount information for E-Sonic to grow organically and achieve the ultimate company objective of dominant market leadership in the online music category. Having a better understanding of current state

Construction Planning and Scheduling Free Essays

Introduction Construction activities are often exposed to various weather conditions, and often construction productivity is dependent on these weather conditions. Weather conditions are local, seasonal, and sometimes unusual. Inclement weather conditions often result in project disruptions, delays, and disputes between the project parties. We will write a custom essay sample on Construction Planning and Scheduling or any similar topic only for you Order Now Many trades such as earthwork, concrete, roofing, and landscaping are often affected by severe weather, meanwhile other trades such as carpet installers or sheetrock installers may not be directly affected by the weather. Owners, general contractors, and subcontractors all face many risks associated with weather conditions. In order to mediate weather risks, all of the involved construction parties adopt various strategies; purchase insurance, and contract options. Typically project owners try and allocate the risks related with weather delays by adding weather clauses in the contract provisions. The goal of this paper is to discuss the impact of weather delays in construction projects. A construction schedule should include a developed plan to allow for adverse weather. The weather considerations should be addressed during contract negotiation. By accounting for weather integration in the contract and in the baseline schedule owners and the contractor can reduce the risk of disputes from weather impacts and avoiding the rejection of claims dealing with unforeseeable or unusually severe weather. Most contracts nowadays have integrated weather calendars in the schedule. Adverse Weather Adverse weather, commonly referred to as severe weather, is any weather condition, rain, snow, temperature that exceeds historical data gathered over a specific period of time to establish what could be reasonably expected over the course of the construction project. Establishing unusually severe weather can be a challenging task. The most common method is to compare the actual weather experienced on the project to a historical normal for the same location. By using historical data a normal or expected level of severe weather can be established for a given time period. (Long 2010) Normal Weather Severe weather conditions should be incorporated in all construction contracts and in the contract it should specify the difference between normally and abnormally severe weather conditions. In contracts today, it is normal for some owners and contractors to provide the anticipated number of weather days in today’s contracts. The contracts now specify the average number of adverse weather days for certain project locations. It is in the best interest of projects to identify weather statistics, and contracts should provide the number of anticipated weather delay days based on those statistics. Temperature Temperature is well defined in construction contracts. The standard specifications in a contract include the minimum and maximum temperatures for many construction materials. However, temperature directly affects the productivity of workers. Most construction materials have thresholds. However, temperature is a type of weather effect in which construction does not necessarily have to be delayed when exceeding these thresholds, as long as the project can absorb expenditures for controlled measures such as heated enclosures. Wind Wind can affect certain construction operations, but the effect of wind on temperatures is equally important. The combination of low temperatures and wind causes wind chill, which can reduce productivity and can even be dangerous to workers. Wind alone can force several construction activities to shut down, for example high winds can make cranes unstable, which could lead to accidents. High wind also may cause fresh concrete to dehydrate on the surface. Wind not only affects the temperature and construction activities such as crane work, but wind also affects materials and material processes. Soil Temperature Soil temperature does not directly affect labor productivity, but it does have an effect on operations and equipment. The biggest impact of soil temperature is on earthwork. Frozen ground magnifies the difficulty of movement and compaction of soils. Frozen soil conditions greatly reduce the equipment productivity. As cold weather affects the operator of the equipment, the soil conditions affect the effectiveness of the equipment. Weather Delay Day What type of weather qualifies as a weather delay day? A weather delay day is a day in which work must be completely stopped because efficient construction operations will be difficult to achieve with the weather conditions. Three key factors affecting weather delays and disruptions are; type of construction, on-site drying conditions, and the intensity of rainfall. The threshold values for adverse weather vary from location to location. The threshold values also depend on the trades working and various other social and natural factors. However, a weather day should be decided based on the combination of the threshold values, type of work affected, and common sense. Table 1 below shows a sample adverse weather day calendar. (Glavinich n. d. ) Table 1: Sample Adverse Weather Allowances MonthJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDEC Adverse Weather Days665452245544 Weather Calendars Once threshold values are determined, the adverse weather days can be incorporated into the plan. Normally many weather incorporation methods can be used to satisfy the contract requirements. In order to claim time for unusually severe weather, it is common practice that the documented adverse weather days in excess of the monthly allowances must affect the completion of critical path activities. A good way to track and plan for weather days and planning for the activities they impact is a scheduling model that incorporates adverse weather days into a weather calendar. The weather calendar is tied to the weather sensitive activities. This task typically involves: †¢Documentation of all activities in the schedule that are prone to adverse weather †¢Application of the weather calendar to activities subject to adverse weather †¢Development of a baseline schedule in accordance with the project scheduling specifications †¢Calculation of the new finish date (Sabol 2004) Type of Work The type of construction work greatly influences the impact weather has on a project. Certain activities are particularly sensitive to weather conditions; meanwhile other tasks are not as sensitive to weather. Others factors such as equipment being used, materials being used, and the activity durations for each activity influence the activities sensitivity to wind, temperature, and precipitation. The projects weather sensitivity also depends on the phase of construction. For example the initial phase of building construction is usually more sensitive to weather than when the building has an exterior shell up. Consequently the allocation of anticipated monthly weather delay in contracts is not sufficient. The scheduled activities and sequencing of activities should be known before the number of monthly weather delay days has been determined because the weather impact is strictly associated with the type of construction activities being performed. Lingering Days Severe weather can have impact on a construction project for many days after the actual severe weather has passed. These lingering days may extend past severe weather periods because of drying time for soils, and accumulated water on the site and before and after snowy conditions. These lingering days are also known as dry out or mud days. Even when trying to specify the number of adverse weather days, a contract is still ambiguous if it does not determine how to deal with lingering days. It is important to differentiate between lingering days caused by predictable and unpredictable weather conditions. Contracts should clearly spell out whether lingering days are included in the monthly normal weather days. For example in Tennessee, adverse weather may include dry out or mud days at a rate of no greater than one make up day for each day or consecutive days beyond the standard baseline that total 1. inch or more of rain. (Syzdik 2012) Lost Days Adverse weather can greatly reduce productivity. Working under adverse weather conditions causes the jobsite efficiency to decrease even though the work might not stop. The decreased productivity due to adverse weather can contribute to schedule delay. The adverse weather not only delays a project due to such direct lost days from a weather event, or dry out days, it also prolong s schedule activities due to lost productivity or inefficiency. This in turn, can delay the overall project schedule. In many circumstances, a contractor is not entitled to compensation incurred by lost labor productivity caused by unusually severe weather, usually only lost time that is associated with unusually adverse weather can be recovered. Personal Opinion If the contract does not specify what constitutes as normally severe weather and determines the weather thresholds for different work to be performed a consistent analysis of severe weather will be impossible. The contracts should specify monthly anticipated weather delay days. Contractors should account for these days when planning their work and planning their baseline schedules. These delay days should include anticipated lingering days based on the construction activities scheduled in the periods of anticipated severe weather. My experience working on a farm has taught me that weather delays happen frequently and these delays throw a wrench in all of the plans. For example during custom harvesting, a rainstorm will bring a halt to all combine harvesting. Often if it rains more that a few hundredths of an inch work is stopped for at least one full day. This becomes an issue when there is another customer waiting to have their crops harvested but we have to sit and wait in one location for the crops to dry out enough to be cut, before we can move to the next location. If the crops are not harvested soon there is a chance that the crops could be destroyed by a hailstorm, or the crop could lose value if it gets rained on because the coloring gets washed from the grains. This has taught me that proper planning and scheduling can help to minimize the losses associated with severe weather delays. Conclusion Adverse weather conditions and delays in construction are a source of costly claims and disputes in construction. Contracts should include monthly anticipated weather delay days, and a system to define or determine anticipated lingering days should be clearly defined in the contract along with threshold values for weather parameters. These weather threshold values play a critical role when determining if weather is unusually or usually severe. Finally contracts should address the requisites to request a time extension cause by inefficiency due to unusually severe weather conditions. Much of the litigation resulting from weather delay disputes is based on the lack of adequate terms in the contracts. Whether a day with adverse weather is workable or not depends on the weather thresholds. The bottom line is, plan as for normal adverse weather, and know what the contract requires for adverse weather. Records should be kept of adverse weather occurrences, and time extension request should be submitted as required by the contract. When a project experiences adverse weather, the best case scenario is that weather considerations are included within the contract and in the schedule as applicable standards with respect to approach and evaluation. If weather impacts become an issue and are not present in the contract, the project management team and scheduler should develop reasonable weather allowance. If it becomes necessary to implement a method mid project, it is very important that the weather allowance standards are acceptable to all the construction parties and that all the assumptions used in the risk analysis are consistent and accurate. Bibliography Glavinich, Thomas. Construction Planning and Scheduling. Edited by Second Edition. The Associated General Contractors of America. Long, Nguyen. Analysis of adverse weather for excusable delays. American Society of Civil Engineers. 5 26, 2010. ascelibrary. org/coo/resource/1/jcemd4/v136/i12/p1258_s1? iew=fulltext (accessed 4 4, 2012). Morosko, Nick, interview by Andrew Barthel. Project Manager Bozeman, MT, (4 2, 2012). Sabol, Kevin. Integrated Framework for Quantifying and Predicting Weather related delays. American Society of Civil Engineers. 8 16, 2004. ascelibrary. org/coo/resources/1/jcemd4/v136 (accessed 4 6, 2012). Syzdik, Brian. Weather Considerations for Construction Project Scheduling Models. Society of American Militar y Engineers. 10 12, 2012. militaryengineers. wordpress. com/2010/10/12 (accessed 3 24, 2012). How to cite Construction Planning and Scheduling, Essay examples

Blod Bank free essay sample

It will explain the purpose and features of the system, the interfaces of the system, what the system will do, the constraints under which it must operate, specific requirements and other supporting information. This document is intended for both the stakeholders and the developers of the system. This document is intended for developers, project coordinator, project guide, users and testers. The developer can use the document to view the analysis and design part, to understand requirements specification. The project coordinator can use this document to review the idea of project whether it is innovative and usable or not. The project guide can use this document to analyze and manage the flow of project development. The tester can use this document to get clear idea about system, to understand the exact input domain of system and to generate respective test cases for the testing purpose. 1. 1 Purpose This Software Requirements Specification provides a complete description of all the functions and specifications of the Blood bank Management System software. We will write a custom essay sample on Blod Bank or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page The purpose of this document is to present a detailed description of the Blood Bank System. This document is useful for Blood Bank employees who use this system on the daily basis. This document will also serve as a reference to incorporate any changes made in the system to the future. It will also prove to be useful to the managerial staff which is responsible for the smooth functioning of the counter transactions that are performed on daily basis. This document is primarily intended to provide a detailed specification of the functional requirements for developers of the product. It also provides an overview of the product for the users. It will explain the purpose and features of the system, what the systems do and the constraints under which it will operate. This SRS document contains the complete software requirement for Post Office Transaction System and describes the design decisions, architectural design and the detail design needed to implement the system. It provides the visibility in the design and provides information needed for software support. 1. 2 Scope This software is used by System Administrator, Supervisor, Assistant and Lab technicians. The system is designed to provide user authentication by maintaining the user database which contains all the details of user along with login details such as username and password. Each user has a different level of operation for the authentication purpose. The solution will provide a well-organized and coordinated system where the blood and donor records are managed more efficiently with better security. The major goal of the system is to provide synchronized and centralized donor and blood stock database to the blood bank. It also improves the efficiency of blood stock management by alerting the blood bank administrator. System will provides traceability of donor in case of emergency. It also provides performance evaluation using report generation. 1. 3 Definitions, Acronyms, and Abbreviations This subsection should provide the definitions of all terms, acronyms, and abbreviations required to properly interpret the SRS. This information may be provided by reference to one or more appendixes in the SRS or by reference to other documents. 1. 4 References 1. www. bharatbloodbank. com 2. www. bloodbankindia. com 1. 5 Overview This document contains a brief history and insight into the problem as well as what the system is designed to do, the scope of the solution. It gives a brief summary of whom the system is targeted at, its capabilities, and its positioning in the device development process. It also explains requirements of the system and also where exactly the user and stakeholders are placed in the scheme of things. It elaborates on security issues, hardware and software requirement and also the priorities of various functionalities. The document helps the user to understand the Blood Bank System. The first part of the document provides the purpose, objectives and scope of the proposed system. It includes important definition, the problem statement specify the needed details to avoid any kind of ambiguity from user’s perspective. The document also states the feature set and capabilities of the system. The document also highlights the feature of proposed system and the advantages over the existing system. The document also highlights the various issues, error handling and the modification to be done in the system. The document is helpful to the user as it gives them opportunities to state what they expect from the system. In addition, the hardware specification required for the system is also mentioned. The user can read the document and make sure that his machine is equipped to run the system to avoid any inconvenience The user should make use of the document to understand the system better. The rest of this document provides a full description of the project for the blood bank. It lists all the functions performed by the system. It gives the details of each of the system functions and actions in full for the software developer’s assistance. It also gives the overview of the problems currently faced by the system and provides solutions for the same. 2. General Description The project deals with the problem of automated management system that is keeping track of the actual amount of blood stock in the blood bank and to minimize human errors. The solution will provide a well-organized and coordinated system for blood bank where the blood and donor records are managed more efficiently with better security and added automation functions in alerting the administrator when the blood quantity is below par level and about the expired samples. In addition, the administrator can also trace back the donor responsible in case of reactive sample in blood transfusion and blood screening result. This system also creates a convenient and paperless environment for the blood bank in managing donors and processing blood stocks. The registration time for old donor is shortened as the records are retrievable from the system. Also the performance evaluation is possible using report generation facility. 2. 1 Product Perspective This system keep the track of all the actual amount of the blood stock in the blood bank to minimize the human errors. 2. 2 Product Functions 1. System will also maintain Blood Stock records and Discard register. 2. System will provide levels of operators for authentication purpose. 3. System will provide an authentication form where the users will fill the details. 4. System will process the request of login. 5. System will check for the entered details in the login database. 6. If the entered username and password are valid then the system will grant access to the user else will display an error message. 7. System will provide five interfaces such as Testing Interface, Blood Stock Interface, Issue Interface, Donor Registration Interface and Statistics Interface. 8. Donor Registration Interface will take all the personal and medical details of donor and generate a unique id for each donor. 9. If the donor already has an id then will retrieve its details. 10. In Testing Interface, if the results are positive then discard register is updated with sample details. 11. If the results are negative Blood Stock Repository is updated with sample details. 12. In Blood Stock Interface, system will generate unique bag numbers for each product. 13. It will generate alerts when the blood quantity is below par level and about the expired samples. 14. The System will move expired sample details to discard register and update blood stock repository. 15. In Issue Repository, system will check blood stock repository for availability. 16. If stocks are available then system will place an issue order. 7. It will generate a label which includes bag number and details of sample. 18. In Statistics analysis, system will generate various reports. 19. The whole transaction of the blood will be recorded in a system 20. The software will perform the stock management amp; bill generation. 21. All the transaction of the blood will be updated within a small period of t ime. 22. The software will generate all the annual record of the blood bank.. 23. It will also maintain the record of the blood donor. 24. It will also maintain the record of the rejected blood and the rejection for the blood rejection. 2. User Characteristics The user must have the basic knowledge of the computer system. It is not necessary that the user must have the knowledge of the computer hardware. System administrator, supervisor, assistant and lab technicians. 2. 4 General Constraints * Blood bank employees ,donors 2. 5 Assumptions and Dependencies * The System will not allow any user with invalid username and invalid password. * The system should not provide administrative privilege to any customer. 3. Specific Requirements The systems should satisfy the below given requirements. 1. Operating System: Windows XP Professional 2. Database Management System (DBMS): MySQL 5. 0 3. Peer to peer connection. This can be done by connecting both the systems using a cross cable and giving different IP addresses to them. 3. 1 External Interface Requirements System Interfaces The systems should satisfy the below given requirements. 4. Operating System: Windows XP Professional 5. Database Management System (DBMS): MySQL 5. 0 6. Peer to peer connection. This can be done by connecting both the systems using a cross cable and giving different IP addresses to them. User Interfaces User Type| Intended Interaction| 1. DONOR REGISTRATION a. New donor b. Regular donor| * The system will take all the personal and medical details of donor and generate an unique id for the donor. * The system will take donors id as input, validate it and retrieve all its details including last donations. | 2. Administrator Login | * This login page will take input as username and password from the administrator * The system will validate the inputs and provide access to the system with more privileges to system and administrator| Testing | * This will take the input as blood group, donor id, date of collection; test carried out and its result. If the test results are positive then sample details are moved to discard register otherwise to blood stock repository. | Blood stock| * It will take all the details of the samples including blood group, its product details, date of collection, date of preparation, date of expiry, result of testing and generate a bag number. * It will generate alerts when the blood quantity is below par level and about the expired samples. * The expired sample details are moved to discard register and removed from blood stock repository. | Issue| * It will take input as product name, quantity, blood group and validate it with blood stock repository. If the stock is available then issue order will be placed. * It will generate a label which includes bag number, details of sample etc. | Statistics Display Page| * The administrator has access to this page. It displays all statistical data regarding the various issue orders placed, blood stock repository and testing screening. * Report generation. | 3. 5 Non-Functional Requirements Goal To provide authentication to donors. Objective 1 – Create unique id for donor’s. a. Accept donor personal and medical information for new donors. b. Generate unique id for each donor. Objective 2 – Process authentication request. a. Accept donor id in case of regular donor. b. Retrieve donor’s profile. Goal To manage Blood Stocks. Objective 1 – Process blood stock details. a. Accept product details like collection date, expiry date, blood group etc. b. Generates a unique bag number. Objective 2 – Establish connection with Issue interface and testing interface. a. Validate stock details for issue. b. Update blood stock repository after testing is negative. Goal To generate reports and label. Objective 1 – To generate report. a. Generate product statistics b. Generate yearly, monthly reports and provide it to the administrator. Objective 1 – To generate labels for issue. a. Generate labels for the issue order placed. b. Provide it to the customer along with the date of delivery 3. 5 Non-Functional Requirements 7. 1. 1 Availability * For the customers, the services available are: Registration as a donor, placement of issue order. * For the administrator, the services available are: Manipulation of databases, change the functionalities provided by the system and monthly and yearly reports generation. . 1. 2 Security * This system maintains consistency and security as the blood stock details can’t be modified by the administrator or the other user. The system analyses the issue order placed by the customer and accordingly fulfills it. The system will also provide authentication by using username and password. * The donor’s database will have its own security to prevent unauthorized write/de lete access. The donor’s details will not be disclosed while issuing. 3. 8 Logical Database Requirements The databases used by the system are * Donor database Blood stock database * Discard database * Account database User database: The purpose of this database is to store the required information of the donors and their id’s. This database will be used for traceability of donor. The donors will fill their information while registration. Their credentials will be saved in this particular database. Blood Stock database: This database is used to maintain blood stock information. It maintains the details of valid samples. Discard database: This database is used to store details of blood samples which have to be discarded. This will contain information of expired samples and those samples which reacted positively in testing screening. Accounts database: The purpose of this database is to store the account details regarding issue of blood sample and to maintain the history of all the previous transactions. This database will be used by the administrator so that he can calculate the total cost of the issue orders placed. Accessing capabilities: 1. Only administrator can set the role of users and their access capabilities 2. No user can access anything outside its accessing capability .