We present a novel method to produce crystalline oxide aerogels which is based on the cross linking of preformed colloidal nanocrystals (NCs) triggered by propylene oxide (PO). Ceria and titania were used to illustrate this new approach. Ceria and titania colloidal NCs with tuned geometry and crystal facets were produced in solution from the decomposition of a suitable ACS Paragon Plus Environment salt in the presence of oleylamine (OAm). The native surface ligands were replaced by amino acids, rendering the NCs colloidally stable in polar solvents. The NC colloidal solution was then gelled by adding PO, which gradually stripped the ligands from the NC surface, triggering a slow NC aggregation. NC-based metal oxide aerogels displayed both high surface areas and excellent crystallinity associated with the crystalline nature of the constituent building blocks, even without any annealing step. Such NC-based metal oxide aerogels showed higher thermal stability compared with aerogels directly produced from ionic precursors using conventional sol-gel chemistry strategies. ; This work was supported by the European Regional Development Funds and the Spanish MINECO project SEHTOP (ENE2016-77798-C4-3-R) and TEMPTATION (MAT2016-79455-P). TB thanks FI AGAUR Research Fellowship Program, Generalitat de Catalunya (2015 FI_B00744). This project has received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No 712949 (TECNIOspring PLUS) and the Government of Catalonia's Agency for Business Competitiveness (ACCIÓ).
PurposeThe purpose of this paper is to investigate how perceived benefits, perceived risk, and trust influence Chinese consumers' online group buying organized by institutional initiators.Design/methodology/approachIn total, 578 valid samples were collected via an online survey. Multiple regressions were used to test the research model.FindingsThe results show that three perceived benefits (price benefit, convenience benefit, and recreational benefit) and three factors that together represent trust of the initiator (perceived reputation, structural assurance, and website trustworthiness) significantly positively influence consumers' attitudes toward online group buying.Originality/valueThis study is the first one to specifically focus on how perceived benefits and perceived risks influence consumers' attitudes toward online group buying.
AbstractTo compare the extent to which (a) amount versus adequacy of received support and (b) support provision versus solicitation behaviors predict marital satisfaction, married couples from the United States (N= 275) provided perceptions of received support and participated in 2 support transactions. Actor–partner interdependence modeling and structural equation modeling techniques were employed. Husbands' perceptions of support adequacy predicted marital satisfaction more than their perceptions of support amount, whereas the results were generally the opposite for wives. Husbands' provision and wives' solicitation behaviors predicted marital satisfaction. Results suggest the need to move beyond simple counts of support received to examining support adequacy—and the various behaviors and roles involved in supportive transactions—to enhance theories of support and relationship functioning.
Hidden behind a number of economic crises in the mid- to late 1990s-including Argentina's headline-grabbing monetary and political upheaval-is that fact that Latin American economies have, generally speaking, improved dramatically in recent years. Their success has been due, in large part, to macroeconomic reforms, and this book brings together prominent economists and policymakers to assess a decade of such policy shifts, highlighting both the many success stories and the areas in which further work is needed. Contributors offer both case studies of individual countries and regional overviews, covering monetary, financial, and fiscal policy. Contributors also work to identify future concerns and erect clear signposts for future reforms. For instance, now that inflation rates have been stabilized, one suggested "second stage" monetary reform would be to focus on reducing rates from high to low single digits. Financial sector reforms, it is suggested, should center on improving regulation and supervision. And, contributors argue, since fiscal stability has already been achieved in most countries, new fiscal reforms need to concentrate on institutionalizing fiscal discipline, improving the efficiency and equity of tax collection, and modifying institutional arrangements to deal with increasingly decentralized federal systems. The analysis and commentary in this volume-authored not only by academic observers but by key Latin American policymakers with decades of firsthand experience-will prove important to anyone with an interest in the future of Latin American's continuing economic development and reform. Contributors to this volume: José Antonio González, Stanford University Anne O. Krueger, International Monetary Fund Vittorio Corbo, Pontifical Catholic University, Chile Klaus Schmidt-Hebbel, Central Bank of Chile Alejandro Werner, Bank of Mexico Márcio G. P. Garcia, Pontifical Catholic University, Rio Tatiana Didier, World Bank Gustavo H. B. Franco, former president, Central Bank of Brazil Francisco Gil Díaz, Minister of the Treasury, Mexico Roberto Zahler, former governor, Central Bank of Chile Ricardo J. Caballero, Massachusetts Institute of Technology Philip L. Brock, University of Washington Stephen Haber, Stanford University Pablo E. Guidotti, Universidad Torcuato Di Tella, Buenos Aires Vito Tanzi, International Monetary Fund Enrique Dávila, Ministry of Finance, Mexico Santiago Levy, Mexican Social Security Institute Ricardo Fenochietto, private consultant, Buenos Aires Rogério L. F. Werneck, Pontifical Catholic University, Rio Carola Pessino, Universidad Torcuato di Tella, Buenos Aires Michael Michaely, Hebrew University of Jerusalem
Background: Surgery is the main modality of cure for solid cancers and was prioritised to continue during COVID-19 outbreaks. This study aimed to identify immediate areas for system strengthening by comparing the delivery of elective cancer surgery during the COVID-19 pandemic in periods of lockdown versus light restriction. Methods: This international, prospective, cohort study enrolled 20 006 adult (≥18 years) patients from 466 hospitals in 61 countries with 15 cancer types, who had a decision for curative surgery during the COVID-19 pandemic and were followed up until the point of surgery or cessation of follow-up (Aug 31, 2020). Average national Oxford COVID-19 Stringency Index scores were calculated to define the government response to COVID-19 for each patient for the period they awaited surgery, and classified into light restrictions (index 60). The primary outcome was the non-operation rate (defined as the proportion of patients who did not undergo planned surgery). Cox proportional-hazards regression models were used to explore the associations between lockdowns and non-operation. Intervals from diagnosis to surgery were compared across COVID-19 government response index groups. This study was registered at ClinicalTrials.gov, NCT04384926. Findings: Of eligible patients awaiting surgery, 2003 (10·0%) of 20 006 did not receive surgery after a median follow-up of 23 weeks (IQR 16-30), all of whom had a COVID-19-related reason given for non-operation. Light restrictions were associated with a 0·6% non-operation rate (26 of 4521), moderate lockdowns with a 5·5% rate (201 of 3646; adjusted hazard ratio [HR] 0·81, 95% CI 0·77-0·84; p<0·0001), and full lockdowns with a 15·0% rate (1775 of 11 827; HR 0·51, 0·50-0·53; p<0·0001). In sensitivity analyses, including adjustment for SARS-CoV-2 case notification rates, moderate lockdowns (HR 0·84, 95% CI 0·80-0·88; p<0·001), and full lockdowns (0·57, 0·54-0·60; p<0·001), remained independently associated with non-operation. Surgery beyond 12 weeks from diagnosis in patients without neoadjuvant therapy increased during lockdowns (374 [9·1%] of 4521 in light restrictions, 317 [10·4%] of 3646 in moderate lockdowns, 2001 [23·8%] of 11 827 in full lockdowns), although there were no differences in resectability rates observed with longer delays. Interpretation: Cancer surgery systems worldwide were fragile to lockdowns, with one in seven patients who were in regions with full lockdowns not undergoing planned surgery and experiencing longer preoperative delays. Although short-term oncological outcomes were not compromised in those selected for surgery, delays and non-operations might lead to long-term reductions in survival. During current and future periods of societal restriction, the resilience of elective surgery systems requires strengthening, which might include protected elective surgical pathways and long-term investment in surge capacity for acute care during public health emergencies to protect elective staff and services.