The qualitative analysis of characteristic of callers to a psychological hotline at the early stage of COVID-19 in China.

BACKGROUND: As the outbreak of COVID-19, traditional face-to-face psychological intervention are difficult to achieve, so hotline becomes available and recommended strategies. The callers' characteristic could help us to study their experiences of emotional distress, as well as the reasons for calling during the pandemic, which can be used to inform future service design and delivery. METHODS: The information of 1558 callers called our hospital' s hotline for help from February 3, 2020, to March 16, 2020 were collected in the form of Tick-box and Free text, and the inductive content analysis was undertaken focusing on the reasons for caller engagement. RESULTS: It was indicated that more than half of the callers are female (59.7%), mostly between the age of 18-59 (76.5%). The average age was 37.13 ± 13.76 years old. The average duration of a call to the hotline was 10.03 ± 9.84 min. The most frequent description emotional state were anxious (45.1%) and calm (30.3%), with the sub-sequence of scared (18.2%), sad (11.9%), and angry (6.9%). All callers displayed a wide range of reasons for calling, with needing support around their emotion (64.6%), seeking practical help (44.0%), and sleep problems (20.3%) constituting the majority of calls. Among the subthemes, 314 callers thought the epidemic has made them upset, 198 asked questions about the epidemic, and 119 reported their life routines were disrupted. The prevalence of key reasons does not appear to differ over time. Through their feedback, 79.1% agreed that they felt emotionally better after calling, and 95.0% agreed that hotline had helped them. CONCLUSIONS: During the epidemic, the most concern of the public is still related to epidemics and its adverse effects. Fortunately, the hotline can be an active and effective rescue measure after an emergency happened.

Impact of Molecular Ligands in the Synthesis and Transformation between Metal Halide Perovskite Quantum Dots and Magic Sized Clusters.

Metal halide perovskite quantum dots (PQDs) and perovskite magic sized clusters (PMSCs) exhibit interesting size- and composition-dependent optoelectronic properties that are promising for emerging applications including photovoltaic solar cells and light-emitting diodes (LEDs). Much work has focused on developing new synthesis strategies to improve their structural stability and property tunability. In this paper, we review recent progress in the synthesis and characterization of PQDs and PMSCs, with a focus on the impact of different molecular ligands on their surface passivation and interconversion. Moreover, the effect of capping ligands on ion exchange during synthesis and doping is discussed. Finally, we present some perspectives on challenges and opportunities in fundamental studies and potential applications of both PQDs and PMSCs.

Ca and Cu doped LaFeO3 to promote coupling of photon carriers and redox cycling for facile photo-Fenton degradation of bisphenol A.

Enhancements in the light response and hydrogen peroxide utilization are critical to the catalytic performance of heterogeneous Fenton-like perovskites. Here, in this research, oxygen vacancy-enriched La0.9Ca0.1Cu0.5Fe0.5O3-δ was prepared by a co-precipitation method with Cu substitution and Ca doping and demonstrated excellent performance for the degradation of bisphenol A. Both total organic carbon (TOC) removal and hydrogen peroxide utilization were close to 90% within 120 min at pH 3-7, where the TOC removal and hydrogen peroxide utilization were 2.5 times and 5.5 times of LaFeO3 in the absence of Ca and Cu doping. It demonstrated excellent stability to light irradiation and oxidation with respect to cycling and metal ion leaching. This revealed that oxygen vacancies were enriched in the catalyst with the substitution of Ca and Cu and contributed to the recombination of photogenerated electrons, thereby increasing the reduction efficiency of copper ions and accelerating the redox cycling of iron ions.

Enhanced removal of Cr(VI) via in-situ synergistic reduction and fixation by polypyrrole/sugarcane bagasse composites.

Reduction and recycling of Cr(VI) can offer environmental governance and sustainable development. Polypyrrole/sugarcane bagasse composites (PPy/SCB) for efficient adsorption and reduction of Cr(VI) in wastewater were prepared by in-situ polymerization. The effects of the initial pH, Cr concentration, adsorbent dosage, contact time, composition ratio and temperature on adsorption capacity were explored. The optimal Cr(VI) adsorption capacity of PPy/SCB was achieved when the pH value was 2.0. The adsorbents before and after adsorption were characterized, which confirmed that adsorption process affects the morphology, composition and structure of the PPy/SCB surface. The adsorption kinetics data of Cr(VI) were best fitted by the pseudo-second-order model, which indicated that Cr(VI) concentration gradient played a driving role in this process. The adsorption isotherm data were consistent with the Langmuir isotherm model with the adsorption capacity of 156-251 mg/g. Synergic effect of PPy and SCB during the processes of electrostatic adsorption and ion exchange, in-situ reduction of electron donors, and coordination were found to be responsible for the rapid removal and toxicity reduction of total Cr in aqueous solution. Cr(VI) anions can be chelated by oxygen-containing functional groups on SCB surface after reduction to simple cations, which was confirmed by Fourier transform infrared spectrometry and X-ray photoelectron spectroscopy results. This study provides a reasonable scheme for the targeted use of waste biomass for heavy metal pollution control.

Synthesis and Optical Properties of Mn2+-Doped Amino Lead Halide Molecular Clusters Assisted by Chloride Ion.

Mn2+-doped amino lead halide molecular clusters (MCs) are synthesized using amine (e.g., n-octylamine, or butylamine) as passivating ligand and MnX2 (X = Cl or Br) as the Mn2+ doping source at room temperature. Their optical properties are investigated with UV-visible absorption, photoluminescence (PL), and PL excitation spectroscopy. The Mn2+ precursor plays a vital role in the synthesis of Mn2+-doped MCs. MnCl2 seems to facilitate the incorporation of Mn. The MnCl2 doping causes electronic absorption blue shift and leads to a spin-forbidden 4T1 → 6A1 Mn d-electron emission. With the help of time-resolved PL, Fourier transform infrared, and electron paramagnetic resonance results, a model is proposed to explain the formation mechanism. We suggest that Mn2+ doping replaces Pb2+ is assisted by Cl- ions that replace Br- ions. This study demonstrates the possibility of doping MCs and has important implications in gaining new fundamental insight into the growth mechanisms of perovskite nanostructures.

Femoral trochanteric fracture: PFNA spiral blade placement with the aid of an angler.

OBJECTIVE: To investigate the effect of angler-assisted proximal femoral nail antirotation (PFNA) spiral blade fixation in treating femoral trochanteric fractures. METHODS: Patients who underwent angler-assisted PFNA screw blade fixation (angler-assisted group), or conventional internal fixation-intramedullary nailing (traditional surgery group) were included. Intraoperative indicators and treatment effects data were retrospectively analysed. RESULTS: Statistically significant differences were observed between the angler-assisted group (n = 27) and traditional surgery group (n = 28) regarding surgery duration (71.24 ± 8.01 min versus 81.50 ± 11.56 min), number of intraoperative fluoroscopy images (7.28 ± 0.91 versus 12.83 ± 1.55), and surgical bleeding volume (88.80 ± 7.98 ml versus 121.11 ± 27.21 ml). Rates of one-time intramedullary pin puncture for internal fixation in the angler-assisted and traditional surgery groups were 92.59% (25/27) and 32.14% (9/28), respectively. At 1 year following surgery, fractures in both groups had healed without internal fixation failure or fracture displacement failure. Harris hip function scores were 90.68 ± 4.23 (angler-assisted group) versus 81.69 ± 5.85 (traditional surgery group). CONCLUSIONS: Angler-assisted intramedullary nailing with PFNA spiral blade provides good spiral blade positioning, low internal fixation failure rate, low fluoroscopy, short surgery time, and low bleeding volume. Hip function was well restored.

Oxygen vacancy mediated surface charge redistribution of Cu-substituted LaFeO3 for degradation of bisphenol A by efficient decomposition of H2O2.

The novel catalyst LaCu0.5Fe0.5O3-δ with oxygen vacancies (OVs) was prepared and demonstrated excellent stability and activity for the degradation of bisphenol A. The removal rate of 92.1 % and H2O2 utilization efficiency of 70.4 % were obtained due to the efficient hydroxyl radical generation mediated by OVs. The density functional theory calculation showed that the substitution of Cu and formation of OVs significantly increases the charge density near the active sites. Bader charge analysis revealed that the charge offset accelerated the reduction of Fe. The elevation of electron transfer efficiency also promotes the valence transition of copper and iron atoms. The reversible electronic transition between Fe2+ ⇆ Fe3+, Cu+ ⇆ Cu2+ and Cu2+ ⇆ Fe2+ involved in this reaction were considered to be enhanced and the homolytic bond clearage of H2O2 was simultaneously promoted, facilitated by the electron-rich region combined with OVs on the surface of LaCu0.5Fe0.5O3-δ.

The development of the 'COVID-19 Psychological Resilience Model' and its efficacy during the COVID-19 pandemic in China.

During the novel coronavirus disease 2019 (COVID-19) outbreak, traditional face-to-face psychological interventions have been suspended due to high risks of rapid transmission. Developing an effective online model of psychological intervention is deemed necessary to deal with the mental health challenges brought up by this disease. An integrated psychological intervention model coined 'COVID-19 Psychological Resilience Model' was developed in Chengdu, China including live media, 24-hour hotline consultations, online video intervention and on-site crisis intervention sessions to provide services to those in need. A total of 45 episodes of live media programs on COVID-19 outbreak-related psychological problems were broadcasted with over 10 million views. A total of 4,236 hotline consultations were completed. More than 50% of the clients had positive feedback about the hotline consultations. A total of 223 cases received online video intervention, of which 84.97% were redirected from the hotline consultation and 15.03% from COVID-19-designated hospital and community-based observation spots. Seventy one-on-one psychological interventions were conducted with 39 COVID-19 patients, and one-third were treated with medication. Additionally, 5 training sessions were conducted to 98 frontline medical staff. This 'COVID-19 Psychological Resilience Model' is proven effective to the general population during the COVID-19 pandemic. We have greatly improved the overall mental health of our target population during the COVID-19 pandemic. This model could provide valuable experiences and serve as a reference guide for other countries to offer effective psychological intervention, and reduce detrimental negative mental health outcomes in public health emergency.

Cross-linked chitosan/ß-cyclodextrin composite for selective removal of methyl orange: Adsorption performance and mechanism.

A complex chitosan/ß-cyclodextrin polymer was synthesized by bridging with maleoyl chains followed by cross-linking with glutaraldehyde. The adsorption performance of the synthetic polymer was investigated for selective removal of methyl orange (MO) from aqueous solution. The kinetic behavior was well fitted by the pseudo-second order model, while the adsorption process at equilibrium followed the Langmuir isotherm model. The thermodynamic parameters suggested that the adsorption was exothermic and spontaneous. Under optimal adsorption conditions, the capacity for MO reached 392mg/g with the dosage of 10mg/50mL. Based on the analysis from FTIR, 1H NMR, TGA and zeta potential, the adsorption mechanism could be explained by the synergistic effect of electrostatic attraction of amino groups from chitosan and host-guest interaction from ß-cyclodextrin. This adsorbent also demonstrated high selectivity towards MO due to the unique structure of cross-linked chitosan/ß-cyclodextrin polymer that are complementary to that of MO molecule.

Aerobic granular sludge inoculated microbial fuel cells for enhanced epoxy reactive diluent wastewater treatment.

Microbial consortiums aggregated on the anode surface of microbial fuel cells (MFCs) are critical factors for electricity generation as well as biodegradation efficiencies of organic compounds. Here in this study, aerobic granular sludge (AGS) was assembled on the surface of the MFC anode to form an AGS-MFC system with superior performance on epoxy reactive diluent (ERD) wastewater treatment. AGS-MFCs successfully shortened the startup time from 13d to 7d compared to the ones inoculated with domestic wastewater. Enhanced toxicity tolerance as well as higher COD removal (77.8% vs. 63.6%) were achieved. The higher ERD wastewater treatment efficiency of AGS-MFC is possibly attributed to the diverse microbial population on MFC biofilm, as well as the synergic degradation of contaminants by both the MFC anode biofilm and AGS granules.

[Comparison between open reduction internal fixation with kirschner nails and mini-plates in treatment of Mason type II and III fractures of radial head: a case-control study].

OBJECTIVE: To compare the effect between open reduction internal fixation with Kirschner nails and miniplates in the treatment of Mason type II and III fractures of radial head. METHODS: From May 2004 to March 2010, 50 cases of Mason type II and III fractures of radial head were treated with Kirschner nails or mini-plates. In Kirschner nail group, there were 13 males and 10 females (mean age 42.5 +/- 0.7 years), and 14 cases of Mason type II and 9 cases of Mason type III fracture. In mini-plate group, there were 17 males and 10 females (mean age 41.7 +/- 0.5 years), and 16 cases of Mason type II and 11 cases of Mason type of III fracture. The excellent and good rates according to the Broberg and Morrey Elbow Score, and the rate of ectopic ossification were compared. RESULTS: All the patients were followed up for 12-24 (mean 16.5 +/- 1.3) months. The Broberg and Morrey Elbow Score of mini-plate group was (90.5 +/- 11.6), and that of Kirschner nail group was (70.6 +/- 11.3). The result of mini-plate group was excellent in 15 cases, good in 9 cases, fair in 2 cases, and poor in 1 case; The result of Kirschner nail group was excellent in 8 cases, good in 9 cases, fair in 3 cases and poor in 3 cases. The effect of mini-plate group was better than that of Kirschner nail group. There was no statistic difference in the rate of ectopic ossification between the two groups (P > 0.05). CONCLUSION: Fractures of radial head can be well treated with open reduction and internal fixation by mini-plates, which offer better results than Kirschner nails.

[Early diagnosis and therapy of osteofascial compartment syndrome of the foot].

OBJECTIVE: To investigate the effects of decompresion through double-incision of foot dorsum on the treatment of osteofascial compartment syndrome of the foot under the monitoring of saturation of blood oxygen. METHODS: From January 2000 to June 2007, 26 cases of osteofascial compartment syndrome of the foot were decompressed through double-incision of foot dorsum under the monitoring of saturation of blood oxygen, and relaxation suture or skin grafting were operated within 3 to 10 days after decompressing. Among them, 22 patients were males and 4 were females, with an average age of 36.3 years old ranging from 22 to 68 years. According to AOFAS system, the pain, function, autonomic activities and support were evaluated. RESULTS: All patients were followed-up for from 6 to 43 months with the average of 19 months. All patients were healed. According to AOFAS system, the total scores increased from preoperative (30.4 +/- 8.02) to postoperative (92.5 +/- 5.0) (t = 3.13, P < 0.01); the results were excellent in 21 cases, good in 4 and poor in 1. CONCLUSION: The patients of fracture-dislocated, swelling and injured in the soft tissue because of severe violence should observed closely on osteofascial compartment syndrome of the foot early. Feet are operated and thoroughly decompressed as soon as it is diagnosed as the compartment syndrome. Osteofascial compartment syndrome of the foot decompressed by foot dorsum double-incision is convenient and satisfied, and the operation is performed by internal fixation if it is displacedly fractured at the same time.