Poisson's ratio

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  • Auxetic Materials Essay

    and impact resistant. These materials were first researched in the 1980’s and since then scientists have been studying the interesting properties of auxetics and creating several synthetic auxetic materials as well. Auxetic structures and materials are characterized by a negative Poisson’s ratio (NPR). This means that when stretched, the material becomes thicker perpendicular to the axis in tension and thinner perpendicular to the axis in compression. This phenomenon is counter-intuitive since almost all of commonly used materials have a positive Poisson’s ratio—they become thinner perpendicular to the axis in tension and thicker when in compression. The negative Poisson’s ratio is what makes auxetic materials special since many properties of materials depend on this ratio. The Poisson ratio, v, is the ratio of transverse strain (negative for tension; positive for compression) to axial strain (positive for tension; negative for compression), given by v= -(dε_trans)/(dε_axial ) . The Poisson’s ratio ranges from -1.0 to 0.5 for most materials. The shear modulus, G, of a material is related to the Poisson ratio in the following way: G=E/(2(1+v)) . Since auxetic materials have a negative Poisson ratio, the shear modulus of an auxetic material is greater than that of a non-auxetic material, causing the auxetic material to be more resistant to shear forces and impacts. [1] Because of NPR, auxetic materials exhibit several key properties that can be utilized in various applications…

    Words: 1429 - Pages: 6
  • Classroom Interview Paper

    Examples of demographics include; your location, education level, gender, and age. Michael grew up in a populous city in the tidewater region of Virginia. His classes were predominantly African American’s and Caucasians. Interestingly enough, there was a similar mix of individuals that lived in the suburbs compared to individuals living in low-income housing. The ratio of men to women in his classes was very similar. I believe that the ratio of men to women in classes is not a definitive…

    Words: 1382 - Pages: 6
  • Ev71 Essay

    Genogroup B in the late 1990s found to have sudden increases of genetic diversity which correspond to the time when the major HFMD outbreaks were happened in Asia. The observed dynamics of the plot are mostly corresponded with the recorded global surveillance data of EV71 cases over the past 4 decades. Similar results were obtained when using the VP1 gene from genogroup C. This implies that the elevation in genetic diversity is correlated with EV71 epidemics. Natural selection and adaptation in…

    Words: 986 - Pages: 4
  • Hospital Staffing

    staff to patient ratios, or allow the hospital to make decisions about staffing levels, even if it means fewer staff working longer hours? This is a question that affects millions of hospitals and also effects protocols in hospitals all over the world. I rarely visit the hospital, but if I go to the hospital and it’s a very serious case will I be treated quickly enough? Registered nurses have long recognized and continue to point out that staffing issues are an ongoing problem. It…

    Words: 758 - Pages: 4
  • Independent Variables In High School

    another field of study. You will observe other classes of other majors and you will take notes on certain things that caught your interest and that can influence you in working toward a different career that is not related to your major. After years in years college, you might be in a career that you will never expect in being. Most students who studied to be a lawyer would probably change into a teacher in the long run. In this research you can view it in two different proposal ways, either way…

    Words: 800 - Pages: 4
  • Theory Of Span Of Control

    report to one manager. This also can be a ratio by dividing the organizational total number of non-managers by the total number of managers. For example, a unit…

    Words: 703 - Pages: 3
  • What Is Google's Earning Per Share Ratio?

    Earning per share ratio is one of the profitability ratios computed by the net income less preferred dividends and divided the weighted average common shares outstanding. In 2015, Google’s earning per share ratio is $22.84. This indicates that if Google distributed every dollar of income to its shareholders, each shareholder would receive $22.84. In addition, Google’s earning per share ratios also increase from $20.57 in 2014 to $22.84 in 2015. These ratios in recent years are high, which means…

    Words: 982 - Pages: 4
  • Baltimore-Washington Conference Analysis

    weekly attendance group has fewer than 5,700 attendees. Furthermore, the red bar and blue bar combined represents the total membership per size category. For example, there are almost 7,000 total weekly attendees and almost 8,600 members attributed to all churches that fall within Group 400+. The largest section of membership is captured in churches between 50-124 weekly attendees with 30% of the conference’s total membership. Additionally, Baltimore-Washington churches below 35 weekly attendees…

    Words: 1087 - Pages: 4
  • Aborted Girls, Wanted Brides: Article Analysis

    Aborted Girls, Wanted Brides Cultural preference for boys in parts of India results in some of the largest imbalances between males and females in the world. This leads to sex-selective abortions and infanticide of girls, while boys are prized because they are believed to mature as leaders of the world and household, as they pass on the family name and traditions. This perpetuates the ongoing role of patriarchy and the customary belief that men are superior and dominant to their female…

    Words: 1360 - Pages: 6
  • Nurse To Patient Ratios Essay

    Safe Staffing Ratios on a Med-Surge Unit Angela Lyons Eastern Gateway Community College Abstract Nurses have an integral and important role in the health care system. In order to retain nurses and have quality patient care, acceptable nurse to patient ratios must be obtained. Three of the many benefits of adequate nurse to patient ratios are quality patient care, retention of nurses, and patient safety. Safe Staffing Ratios on a Med-Surge Unit Nurse staffing is a complex issue with no easy…

    Words: 1026 - Pages: 5
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