This paper examines how a shock to collateral value influences firms’ debt capacities and investments. Using a source of exogenous variation in collateral value provided by the land market collapse ...in Japan, I find that collateral has a statistically and economically significant impact on corporate investments. I also provide direct evidence on the workings of such a collateral channel. Exploiting a unique dataset of matched bank-firm lending, I show that firms with greater collateral losses are less likely to sustain their banking relationships and tend to obtain a smaller amount of bank credit.
This article uses a large panel dataset that tracks the housing wealth and credit card spending of 12,793 individuals in Hong Kong to study the relationship between housing wealth and household ...consumption. I identify a significant effect of housing wealth on consumption. A pure wealth effect can explain part of the sensitivity: households with multiple houses have much stronger consumption responses. Consistent with a relaxation of the credit constraints, mortgage refinancing significantly increases households' consumption sensitivities. However, for the majority of the households that do not refinance, consumption sensitivity appears to be due to a reduction in precautionary saving.
Pursuing and developing effective methodologies to construct highly active catalytic sites to maximize the atomic and energy efficiency by material engineering are attractive. Relative to the ...tremendous researches of carbon-based single atom systems, the construction of bio-applicable single atom materials is still in its infancy. Herein, we propose a facile and general interfacial-confined coordination strategy to construct high-quality single-atom nanotherapeutic agent with Fe single atoms being anchored on defective carbon dots confined in a biocompatible mesoporous silica nanoreactor. Furthermore, the efficient energy conversion capability of silica-based Fe single atoms system has been demonstrated on the basis of the exogenous physical photo irradiation and endogenous biochemical reactive oxygen species stimulus in the confined mesoporous network. More importantly, the highest photothermal conversion efficiency with the mechanism of increased electron density and narrow bandgap of this single atom structure in defective carbon was proposed by the theoretical DFT calculations. The present methodology provides a scientific paradigm to design and develop versatile single atom nanotherapeutics with adjustable metal components and tune the corresponding reactions for safe and efficient tumor therapeutic strategy.
This article studies how a shock to the financial health of banks, caused by a decline in the asset markets, affects the real economy. The land market collapse in Japan provides an ideal testing ...field in separating the impact of a loan supply shock from demand shocks. I find that banks with greater real estate exposure have to reduce lending. Firms' investment and market valuation are negatively associated with their top lender's real estate exposure. The lending channel is economically important: it accounts for one-third of lending contraction, one-fifth of the decline in investment, and a quarter of value loss.
The selective formation of an annulated 4H‐pyran from an allenoate and an olefin demonstrated the dual roles of triethylenediamine (DABCO) in both Lewis base promoted 4 + 2 annulation and Brønsted ...base mediated C=C isomerization. Interestingly, the role of the Brønsted base could be quenched selectively with the presence of a Brønsted acid (PhCO2H), and annulated 3,4‐dihydro‐2H‐pyran was obtained as the major product.
The selective formation of an annulated 4H‐pyran from an allenoate and an olefin demonstrates the dual roles of triethylenediamine (DABCO) in both Lewis base promoted 4 + 2 annulation and Brønsted base mediated C=C isomerization. The role of the Brønsted base could be quenched selectively with the presence of a Brønsted acid (PhCO2H).
To investigate the resilience of non-local medical workers sent to support local medical workers in treating the outbreak of 2019 novel coronavirus disease (COVID-19).
In February 2020, non-local ...medical workers who had been sent to Wuhan as support staff to respond to the COVID-19 outbreak were asked to complete an online survey composed of the Connor Davidson Resilience Scale (CD-RISC), Hospital Anxiety Depression Scale (HADS) and Simplified Coping Style Questionnaire (SCSQ).
Survey responses from 114 non-local medical workers were analyzed. CD-RISC scores were high (67.03 ± 13.22). The resilience level was highest for physicians (73.48 ± 11.49), followed by support staff, including health care assistants, technicians (67.78 ± 12.43) and nurses (64.86 ± 13.46). Respondents differed significantly in the levels of education, training/support provided by the respondent's permanent hospital (where he or she normally works), and in their feelings of being adequately prepared and confident to complete tasks (P < 0.05). Resilience correlated negatively with anxiety (r = -.498, P < 0.01) and depression (r = -.471, P < 0.01) but positively with active coping styles (r = .733, P < 0.01). Multiple regression analysis showed that active coping (β = 1.314, p < 0.05), depression (β = -.806, p < 0.05), anxiety (β = - 1.091, p < 0.05), and training/support provided by the respondent's permanent hospital (β = 3.510, p < 0.05) were significant associated with resilience.
Our data show that active coping, depression, anxiety, and training/support provided by the respondent's permanent hospital are associated with resilience. Managers of medical staff should use these data to develop psychosocial interventions aimed at reinforcing the resilience of medical workers during highly stressful and prolonged medical emergencies, as seen during the COVID-19 outbreak.
Nickel-titanium alloys have been widely used in biomedical, aerospace and other fields due to their shape memory effect, superelastic effect, as well as biocompatible and elasto-thermal properties. ...Additive manufacturing (AM) technology can form complex and fine structures, which greatly expands the application range of Ni-Ti alloy. In this study, the development trend of additive manufactured Ni-Ti alloy was analyzed. Subsequently, the most widely used selective laser melting (SLM) process for forming Ni-Ti alloy was summarized. Especially, the relationship between Ni-Ti alloy materials, SLM processing parameters, microstructure and properties of Ni-Ti alloy formed by SLM was revealed. The research status of Ni-Ti alloy formed by wire arc additive manufacturing (WAAM), electron beam melting (EBM), directional energy dedication (DED), selective laser sintering (SLS) and other AM processes was briefly described, and its mechanical properties were emphatically expounded. Finally, several suggestions concerning Ni-Ti alloy material preparation, structure design, forming technology and forming equipment in the future were put forward in order to accelerate the engineering application process of additive manufactured Ni-Ti alloy. This study provides a useful reference for scientific research and engineering application of additive manufactured Ni-Ti alloys.
The growing number of industrial carbon emissions have resulted in a significant increase in the greenhouse gas carbon dioxide (CO2), which, in turn, will have a major impact on climate change. ...Therefore, the reduction, storage, and reuse of CO2 is an important concern in modern society. Calcium oxide (CaO) is known to be an excellent adsorbent of CO2 in a high-temperature environment. However, since deterioration of the adsorbent is likely to occur after repeated cycles of adsorption under high temperature conditions, it would be desirable to mitigate this phenomenon, in order to maintain the stability of CaO. In the present study, common eggshell waste was used as the starting material. The main component of eggshell waste is calcium carbonate (CaCO3), which was purified to produce CaO. Different surfactants and amino-containing polymers were added to synthesize CaO-based adsorbents with different configurations and pore sizes. The amount of CO2 adsorbed was determined using a thermogravimetric analyzer (TGA). The results showed that the CO2 adsorption capacity of the synthetic CaO recovered from purified eggshell waste could reach 0.6 g-CO2/g-sorbent, indicating a good adsorption capacity. CaO modified with a dopamine-containing polymer was shown to have an adsorption capacity of 0.62 g-CO2/g-sorbent. Moreover, it showed an excellent adsorption capacity of 0.40 g-CO2/g-sorbent, even after 10 cycles of CO2 adsorption. The present study suggests that using eggshell waste to synthesize CaO-based adsorbents for effective CO2 adsorption can not only reduce environmental waste, but also have the potential to capture greenhouse gas CO2 emissions, which conforms to the principles of green chemistry.
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•CaO prepared from eggshell was applied for CO2 gas adsorption.•Pore size and volume of CaO were varied by using surfactants and amino containing polymers.•Through thermogravimetry analysis amount of CO2 adsorbed were analyzed.•CaO prepare from dopamine containing polymer showed excellent adsorption capacity.
A β-Cyclodextrin covalent organic framework (β-CD COF) was successfully prepared under ambient temperature with a mild chemistry strategy from heptakis(6-amino-6-deoxy)-β-cyclodextrin and ...terephthalaldehyde. It was embedded into the poly(glycidyl methacrylate)-co-(ethylene dimethacrylate) poly(GMA-co-EDMA) monolith and served as the β-CD COF material–incorporated monolith. The synthetic materials were characterized by field emission scanning electron microscopy, energy-dispersive X-ray mapping analysis, transmission electron microscopy, thermogravimetric analysis, Fourier transform infrared spectroscopy, and N
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adsorption-desorption isotherm. The β-CD COF material–incorporated monolith achieved baseline separation in capillary electrochromatographic separation of three amides, three amino acids, three nucleosides, four aromatic acids, and three positional isomers (with resolution values of three amides, 1.75 and 1.54; three amino acids, 5.24 and 1.75; three nucleosides, 2.56 and 1.77; four aromatic acids, 6.96, 2.74, and 1.64; three positional isomers, 1.61 and 1.50). In comparison with the original monolith, the β-CD COF material–incorporated monolith shows significantly enhanced resolution for mixed molecules. The effect of pH and concentration of buffer and applied voltage were discussed in detail. The fabricated monolith showed good stability and reproducibility (relative standard deviation (RSD) < 6.9%). Molecular modeling illuminated the interactions between the small molecules and stationary phase, and provided a sufficient theoretical basis for experimental data.
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Schematic presentation of the preparation of β-cyclodextrin covalent organic framework (β-CD COF) material–incorporated organic polymer monolith for separating the amides, amino acids, nucleosides, aromatic acids, and positional isomers. β-CD COF materials were synthesized and incorporated into the monolith as the stationary phase. Then, the incorporated monolith was applied in the capillary electrochromatography system for separating small molecules.
An efficient one‐pot reaction has been developed for the synthesis of 2,3‐dichloroquinoxaline derivatives 3a–n. The reaction was performed in two steps via a silica gel catalyzed tandem process from ...o‐phenylenediamine and oxalic acid, followed by addition of phosphorus oxychloride (POCl3). A variety of 2,3‐dichloroquinoxalines have been obtained in good to excellent overall yields. Eight known compounds 3a–3h were characterized by IR, 1H‐NMR, and mass spectroscopies. Compounds 3i–3n without spectroscopic data were characterized by IR, 1H‐NMR, 13C‐NMR, and mass spectroscopies.
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