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101.
102.
Shayan Seyedin Jizhen Zhang Ken Aldren S. Usman Si Qin Alexey M. Glushenkov Elliard Roswell S. Yanza Robert T. Jones Joselito M. Razal 《Global Challenges》2019,3(10)
2D transition metal carbides and nitrides called “MXene” are recent exciting additions to the 2D nanomaterials family. The high electrical conductivity, specific capacitance, and hydrophilic nature of MXenes rival many other 2D nanosheets and have made MXenes excellent candidates for diverse applications including energy storage, electromagnetic shielding, water purification, and photocatalysis. However, MXene nanosheets degrade relatively quickly in the presence of water and oxygen, imposing great processing challenges for various applications. Here, a facile solvent exchange (SE) processing route is introduced to produce nonoxidized and highly delaminated Ti3C2Tx MXene dispersions. A wide range of organic solvents including methanol, ethanol, isopropanol, butanol, acetone, dimethylformamide, dimethyl sulfoxide, chloroform, dichloromethane, toluene, and n‐hexane is used. Compared to known processing approaches, the SE approach is straightforward, sonication‐free, and highly versatile as multiple solvent transfers can be carried out in sequence to yield MXene in a wide range of solvents. Conductive MXene polymer composite fibers are achieved by using MXene processed via the solvent exchange (SE) approach, while the traditional redispersion approach has proven ineffective for fiber processing. This study offers a new processing route for the development of novel MXene‐based architectures, devices, and applications. 相似文献
103.
S. Marie Harvey Isaac Washburn Lisa Oakley Jocelyn Warren Diana Sanchez 《Journal of sex research》2017,54(4-5):665-676
Condoms protect against human immunodeficiency virus (HIV)/sexually transmitted infections (STIs) and unintended pregnancy and are essential to sexual health efforts targeting young adults, who are disproportionately affected by both outcomes. Understanding condom use motives is critical to increasing condom use. Research in this area is limited, particularly regarding the roles of partners and relationship factors. Using a longitudinal sample of 441 young adults and 684 reported partnerships we examined associations between relationship factors and condom use motives (pregnancy prevention, disease prevention, or dual protection). Simultaneous multilevel models identified variables associated with motives; level-specific models identified the levels (individual, partnership, time) variables impacted motives. Participants reported choosing condoms for pregnancy prevention, disease prevention, and dual protection in 51%, 17%, and 33% of partnerships, respectively. Partner-specific factors varied, to a differing degree, across the three levels. Seven variables (duration, condom self-efficacy, commitment, sexual decision-making, power, and vulnerability to harm [HIV/STIs] and pregnancy) distinguished condom use motives. The level of this association varied but was most pronounced at the partner and individual levels. Researchers and practitioners should consider the impact of both individual- and partner-level factors on condom use motives, in both research and sexual health programs. 相似文献
104.
This article uses privileged families who hire Independent Educational Consultants (IECs) as an instance to examine how privileged parents collaborate with individuals whom they consider educational experts to support their children in the college race. We argue that advantaged parents' anxieties about their children have created a market for IECs who provide expert advice in order to mitigate the uncertainties that these parents experience and to manage various goals that they want to achieve at an important turning point in their children's lives. Drawing primarily on interviews with parents who work with IECs, we introduce the concept of “collaborative cultivation” to analyze the processes whereby advantaged parents rely on the expertise and expert status of private counselors to cope with their and their children's vulnerability in the college race while at the same time preparing their children for the unknown future. The parental method of “concerted cultivation” reveals how elite parents rely on individuals they perceive as experts to establish “bridges” between their own social worlds and the academic worlds that appear to beyond their control. This bridging labor points to the myriad cultural beliefs enacted to justify the child‐rearing goals that privileged parents wish to accomplish by working with IECs. 相似文献
105.
Ken Ashford Julia Clarke 《Voluntas: International Journal of Voluntary and Nonprofit Organizations》1996,7(3):279-299
This article presents the results of a survey of grant monitoring in 170 UK charities. The monitoring and evaluation process
is modelled and the extent to which donors follow this is explored. Although over 70 per cent of donors monitored grants,
a much smaller percentage proceeded to evaluate results. Reasons for this and an indication of how the processes are carried
out are presented. 相似文献
106.
107.
Ronald S. Warren 《Journal of Labor Research》1985,6(2):199-207
This paper presents evidence concerning the effect of unionization on the average productivity of labor using time-series
data from the private, domestic sector of the U.S. economy over the 1948–73 period. Aggregate technology is specified by a
constant-returns-to-scale, Cobb-Douglas production function which incorporates union and nonunion labor and proxies for both
embodied and disembodied technical change. Maximum likelihood estimates of the model indicate that union membership significantly
decreased average labor productivity, holding constant the quality and mix of capital and labor and controlling for cyclical
effects.
I thank John Addison, Maxim Engers, Barry Hirsch, William Johnson, Duane Leigh, Roger Sherman, and Jonathan Skinner for helpful
comments on an earlier version of this paper. Of course, responsibility for remaining errors is mine. 相似文献
108.
This article uses evidence from 269 interviews in five companies to consider whether (i) equal opportunity laws, policies and practices, (ii) more women gaining post-entry professional qualifications, establishing themselves on the lower rungs of hitherto male careers, and working full-time, combined with (iii) projected skill shortages, are likely to break down gender segmentation and lead to greater equality in employment during the 1990s. The evidence suggests that even females who start strongly and appear potential high-fliers are still being obstructed by harsh, in some respects, and in other ways patronizing, workplace cultures, coupled with demands for career commitment that are incompatible with the domestic responsibilities which it is assumed women will adopt, and which the majority are in fact still adopting at least at certain stages during their working lives. The effects in the companies studied were to deflect women out of mainstream careers into peripheral occupations, or into peripheral jobs within skilled mainstream occupations. In these companies neither the men nor the exceptional women who were succeeding appeared a likely source of pressure for change, and male domination remained fully compatible with the firms' preferred skill formation strategies. 相似文献
109.
Patricia A. Alder Peter Adler Constance R. Ahrons Morton S. Perlmutter William G. Staples Carol A. B. Warren 《The American Sociologist》1989,20(3):207-226
This article introduces and defines the concept of conjoint-career couples, marital partners that work in the same field or
profession. Drawing on the narratives of three couples with structurally varied experiences (older man/younger woman, older
woman/younger man, peers), we describe and analyze some of the problems and issues confronting a growing number of academics
in the current labor pool. We conclude by discussing some of the overarching patterns common to this situation and the advantages
and disadvantages associated with it. Finally, we propose a variety of social policies which academic institutions may want
to consider to help meet the challenge of these changing market demographics.
Currently she is writing and teaching in the areas of deviance, social theory, and the sociology of children. She is the author
ofWheeling and Dealing (Columbia University Press, 1985) and coeditor (with Peter Adler) ofThe Social Dynamics of Financial Markets (JAI Press, 1984).
He is the author ofMomentum (Sage, 1981),Membership Roles in Field Research (co-authored with Patricia A. Adler, Sage, 1987), and the editor, along with Patricia A. Adler, ofJournal of Contemporary Ethnography andSociological Studies of Child Development.
Her special interests are divorce and remarriage and she is the author (with R.H. Rodgers) ofDivorced Families (W.W. Norton, 1987).
His areas of interest are family dynamics with a focus on myth and ritual formation in families.
His interests are in social control and political economy. He is the author ofCastles of Our Conscience: Social Control and the American State, 1800–1985, Polity Press, forthcoming.
She is the author of books and articles on deviance and social control, qualitative methods, and gender, includingGender Issues in Field Research (Sage, 1988),Madwives: Schizophrenic Women in the 1950s (Rutgers University Press, 1987),The Court of Last Resort: Mental Illness and the Law (University of Chicago Press, 1982). 相似文献
110.
With the onset of chronic illness, it has been necessary for these couples to evaluate and redefine their separate as well as merged identities. As each of these individuals sought to realize a mature identity, role adjustments were required. Although not every member of the two illustrated couples had been able to accept the effects and concurrent responsibilities of chronic illness, the nurse practitioner was in a unique position to provide guidance. By reinforcing the importance of healthy identity states, these clients were able to merge temporarily and respond to their partner's basic needs, exchanging a sense of mutual satisfaction, and then to separate into distinct individual identity states. A major task of the older adult is to re-evaluate identity in light of the roles currently being played in life. Through this process, a workable philosophy of life and death should evolve. Most older people engage in a life review of accomplishments and failures, seeking to integrate the diverse elements to obtain an acceptable view of their life's worth (Kaluger, 1984). Couples experiencing chronic illness must reconsider the consequences of this illness state to adequately formulate healthy individual and merged identities. The role of the nurse practitioner is essential in providing guidance for adapting to the life changes confronting elderly couples with chronic illness while maintaining healthy individual and merged identities. 相似文献