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At low frequencies (such as AM broadcast), arrays of vertical towers are used to achieve directionality and they will occupy large areas of land. For reception, a long Beverage antenna can have significant directivity. For non directional portable use, a short vertical antenna or small loop antenna works well, with the main design challenge being that of impedance matching. With a vertical antenna a loading coil at the base of the antenna may be employed to cancel the reactive component of impedance; small loop antennas are tuned with parallel capacitors for this purpose.
Why is this specific antenna type used?
A: achieve directionality

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Early Asian immigrants experienced prejudice and discrimination in the forms of not having the ability to become naturalized citizens. They also struggled with many of the same school segregation laws that African Americans faced. Particularly, during World War II, Japanese Americans were interned in camps and lost their property, homes, and businesses. Discrimination against Asians began with the Chinese Exclusion Act of 1882 and then continued with the Scott Act of 1888 and the Geary Act of 1892. At the beginning of the 20th century, the United States passed the Immigration Act of 1924 to prevent Asian immigration out of fear that Asians were stealing white jobs and lowering the standard for wages. In addition, whites and non-Asians do not differentiate among the different Asian groups and perpetuate the "model minority" stereotype. According to a 2010 article by Professor Qin Zhang of Fairfield University, Asians are characterized as one dimensional in having great work ethic and valuing education, but lacking in communication skills and personality. A negative outcome of this stereotype is that Asians have been portrayed as having poor leadership and interpersonal skills. This has contributing to the "glass ceiling" phenomenon in which although there are many qualified Asian Americans, they occupy a disproportionately small number of executive positions in businesses. Furthermore, the model minority stereotype has led to resentment of Asian success and several universities and colleges have limited or have been accused of limiting Asian matriculation.
Which bill was passed in an attempt to provide for Asian immigration?
A: unanswerable

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The racial preferences debate related to admission to US colleges and universities reflects competing notions of the mission of colleges: "To what extent should they pursue scholarly excellence, to what extent civic goods, and how should these purposes be balanced?". Scholars such as Ronald Dworkin have asserted that no college applicant has a right to expect that a university will design its admissions policies in a way that prizes any particular set of qualities. In this view, admission is not an honor bestowed to reward superior merit but rather a way to advance the mission as each university defines it. If diversity is a goal of the university and their racial preferences do not discriminate against applicants based on hatred or contempt, then affirmative action can be judged acceptable based on the criteria related to the mission the university sets for itself.
What claim did Ronald Dworkin make about the expectations that a college application should not have?
A: a right to expect that a university will design its admissions policies in a way that prizes any particular set of qualities

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Early web browsers supported only a very simple version of HTML. The rapid development of proprietary web browsers led to the development of non-standard dialects of HTML, leading to problems with interoperability. Modern web browsers support a combination of standards-based and de facto HTML and XHTML, which should be rendered in the same way by all browsers.
Non-standard dialects led to what?
A:
problems with interoperability