Continuous countercurrent evaporation through porous water-repellent membrane with pressure above atmospheric

An experimental method for measuring mass transfer rates at pressures above atmospheric has been developed for the case of continuous countercurrent evaporation through porous water-repellent membranes. The final developed equipment is suitable for operation under pressures up to 50 psig and at temperatures near the boiling point of 7% salt water when high flow rates are reached. Rates of evaporation of water through the membrane were measured, and the data and results were used to examine the effects of operating conditions on the over-all mass transfer resistance. Least squares equations for fitting the data were also obtained. Over-all mass transfer coefficients were found to be a strong function of pressures and to depend slightly on flow rates and the log-mean partial pressure of the stagnant air in the membrane. The experimental method should be useful for the study of evaporation through porous membranes for application to commercial sea water conversion --Abstract, page ii

Just state and just man : a dialogue between Plato and Confucius

In this thesis, I propose to explore Plato's moral and political thought in the Republic and compare it with similar ideas in Confucian thought, and in modern liberal thought. In Part I, I deal with Plato's notion of 'doing one's own job' in the just state (ch. 1), and with the Confucian approach to achieving an orderly society (ch. 2). In Chapter 3 the idea that both the Platonic just state and Confucian orderly society are communitarian by nature will be discussed. It is noticeable that although both Plato's and Confucius' accounts of the just state have the colour of communitarianism, yet their accounts are in one way or another different from the modern communitarian's account of the just state. In addition, there are also important differences between Plato and Confucius. Take the relation between personal good and the common good as an example. Both Plato and Confucius hold that in the ideal state one's own good is identical with the good of the state as a whole. But communitarians hold that the common good is prior to personal good. That is, for the communitarians, there is a distinction between personal good and the common good (Section 3). In Part II, I shall consider a problem which arises from the discussion of Plato's notion of the tripartite soul that there is a sub-division in each part of the soul, which leads to infinite regress. I argue in Chapter 4 that this problem can be avoided. So long as there is no 'degree of rationality' among the three parts. That is, only reason is capable of calculating, and the other two parts do not have the capacity of reasoning. This account of the tripartite soul makes sense of why Plato puts such strong emphasis on education. For through education, spirit and appetite are willing to be under the control of reason

Diffusion of Common Application Membership and Admissions Outcomes at American Colleges and Universities

We study the adoption of Common Application membership by private four-year postsecondary institutions and its role in explaining the growth in undergraduate applications. Using data from the College Board’s Annual Survey of Colleges, proportional hazards models suggest that institutions respond to the net benefit of adoption. We then estimate that membership increases applications by 5.7–7.0 percent and decreases yield rates by 2.8–3.9 percent. Acceptance rates decrease for members when their local networks are large. Falsification tests indicate that membership effects occur as a one-time adoption shock. Membership also decreases SAT scores and increases the percent students of color

Returns to Skill and Teacher Wage Premiums: What Can We Learn By Comparing the Teacher and Private Sector Labor Markets?

Estimates the wage differences between public school teachers and other professions over time by gender, advanced degree, major, college quality, and technical and academic skills. Explores the incentives needed to attract and retain effective teachers

Bronchioloalveolar carcinoma

AbstractBronchioloalveolar carcinoma is a subtype of adenocarcinoma of the lung with a relatively better prognosis. We reviewed the cases of 50 consecutive patients with bronchioloalveolar carcinoma treated during a 10-year period and attempted to analyze factors related to prognosis. During the 10-year study period, the prevalence of bronchioloalveolar carcinoma relative to adenocarcinoma of the lung remained steady. The subjects included 32 male and 18 female patients with mean ages of 64.7 years and 55.1 years, respectively (p = 0.0030). The preoperative radiographic findings included 40 cases of localized and 10 cases of diffuse bronchioloalveolar carcinoma. The clinicopathologic TNM staging included 20 patients with stage I cancer, 4 with stage II cancer, 11 with stage IIIa cancer, 3 with stage IIIb cancer, and 12 with stage IV cancer. Forty patients with clinical stage I, II, or III disease underwent operation (operability 80%). The resectability rate was 90% (36 of 40). Thirty-four procedures were considered as curative. The overall cumulative survival at 5 years was 22.2% (46.4% for stage I). Different TNM stages showed significant differences in survival time (p = 0.0001). The median survival times were 64.6 months for stage I, 48.0 months for stage II, 24.7 months for stage IIIa, 9.0 months for stage IIIb, and 4.5 months for stage IV disease. The median survival time for localized bronchioloalveolar carcinoma was 27.5 months, and the median survival time for diffuse bronchioloalveolar carcinoma was 4.3 months (p = 0.0002). The median survival time for the curative resection group was 30.6 months, and the median survival time for the noncurative resection or nonresection group was 5.8 months (p = 0.0001). On the basis of this study we conclude that (1) the prevalence of bronchioloalveolar carcinoma is quite steady, (2) bronchioloalveolar carcinoma presents at an earlier age in women, (3) bronchioloalveolar carcinoma frequently presents with lymphatic spread or systemic metastasis at diagnosis, (4) most localized bronchioloalveolar carcinomas are resectable and the prognosis with this type is better than that of the diffuse type, and (5) long-term survival correlates closely with initial roentgenographic appearance, TNM stage, and completeness of surgical resection. (J THORAC CARDIOVASC SURG 1995;110:374-81