Fe-Si networks and charge/discharge-induced phase transitions in Li2FeSiO4 cathode materials

Structural phase transitions of electrode materials are responsible for poor reversibility during charge/discharge cycling in Li-ion batteries. Using previously developed structural databases, we investigate a structural landscape for LixFeSiO4systems at x = 1. Starting with low-energy Li2FeSiO4 crystal structures, we explore the crystal structures of the material in different states of charge. The as-prepared Li2FeSiO4 materials adopt low energy structures characterized by two-dimensional (2D) Fe–Si networks. After the removal of one Li per formula unit to form LiFeSiO4, the structures with three-dimensional (3D) diamond-like Fe–Si networks become more energetically favorable without a significant impact on the charge capacity, which agrees with previous experimental and theoretical work. However, we reveal that the structure with a 3D diamond-like Fe–Si network can further transform into a new structure at x = 1. And the Li atom is hard to reinsert into these new structures. Consequently the system is prevented from returning to the Li2FeSiO4 state. We believe that the formation of this new structure plays an important role in the loss of reversible capacity of Li2FeSiO4 electrode materials

Energy and macronutrient intakes in preschool children in urban areas of Ho Chi Minh City, Vietnam

Background: An increasing prevalence of overweight and obesity has been documented in preschool children in Ho Chi Minh City (HCMC), Vietnam. However, little is known about what preschool children in HCMC eat or how well their nutrient intake meets nutrient recommendations. This study aims to describe the energy and macronutrient intake and compare these nutrient intakes with the recommendations for Vietnamese children aged four to five years. Methods: The data comes from the baseline measurement of a one year follow-up study on obesity in 670 children attending kindergartens in HCMC. Dietary information for each child at the school and home settings was collected using Food Frequency Questionnaires (FFQs), by interviewing teachers and parents or main caregivers. The average energy and nutrient intake in a day was calculated. The proportion of children with energy intake from macronutrients meeting or exceeding the recommendations was estimated based on the 2006 recommended daily allowance (RDA) for Vietnamese children in this age group. Results: The dietary intake of the participants contained more energy from protein and fat, particularly animal protein and fat, and less energy from carbohydrates, than the RDA. Most children (98.1%) had mean energy intake from protein greater than the recommended level of 15%, and no child obtained energy from animal fat that was in accordance with the recommendation of less than 30% of the total fat intake. Nearly one half of children (46.5%) consumed less than the advised range of mean energy intake from carbohydrate (60%–70%). Conclusion: In this preschool child population in HCMC, in which obesity is emerging as major public health problem, there is an imbalance in dietary intake. Healthy eating programs need to be developed as a part of an obesity prevention program for young children in HCMC

Prospect and potential of Burkholderia sp. against Phytophthora capsici Leonian: a causative agent for foot rot disease of black pepper

Foot rot disease is a very destructive disease in black pepper in Malaysia. It is caused by Phytophthora capsici Leonian, which is a soilborne pathogenic protist (phylum, Oomycota) that infects aerial and subterranean structures of many host plants. This pathogen is a polycyclic, such that multiple cycles of infection and inoculum production occur in a single growing season. It is more prevalent in the tropics because of the favourable environmental conditions. The utilization of plant growth-promoting rhizobacteria (PGPR) as a biological control agent has been successfully implemented in controlling many plant pathogens. Many studies on the exploration of beneficial organisms have been carried out such as Pseudomonas fluorescens, which is one of the best examples used for the control of Fusarium wilt in tomato. Similarly, P. fluorescens is found to be an effective biocontrol agent against the foot rot disease in black pepper. Nowadays there is tremendous novel increase in the species of Burkholderia with either mutualistic or antagonistic interactions in the environment. Burkholderia sp. is an indigenous PGPR capable of producing a large number of commercially important hydrolytic enzymes and bioactive substances that promote plant growth and health; are eco-friendly, biodegradable and specific in their actions; and have a broad spectrum of antimicrobial activity in keeping down the population of phytopathogens, thus playing a great role in promoting sustainable agriculture today. Hence, in this book chapter, the potential applications of Burkholderia sp. to control foot rot disease of black pepper in Malaysia, their control mechanisms, plant growth promotion, commercial potentials and the future prospects as indigenous PGPR were discussed in relation to sustainable agriculture

Disaster response: The COVID-19 pandemic and insider trading around the world

This paper investigates how corporate insiders respond to the initial COVID-19 outbreaks. Using comprehensive insider transaction data from 25 countries, we document a consistent pattern of insider selling during the month after the first COVID-19 case is confirmed in a given country. Insider selling during these disease outbreaks is less pronounced in countries with higher information disclosure requirements, higher public enforcement index, a more efficient judiciary system, and stronger investor protection. Furthermore, cultural differences and the stringency levels of government responses to the COVID-19 outbreaks help moderate insider panic selling when health disasters strike. The findings suggest that a transparent, reliable business system contributes to rebuilding investor trust and corporate resilience during crises

Converting internal brand knowledge into employee performance

© 2019, Emerald Publishing Limited. Purpose: Internal branding efforts are essential in improving employee performance in services marketing. Drawing on reformulation of attitude theory, this paper aims to contribute to the internal branding literature by positing that while internal brand knowledge (IBK) is essential for transforming brand vision into brand reality, it is not brand knowledge per se but its integration with other brand- and customer-related aspects that drive superior employee performance. In particular, this paper develops a cognitive-affective-behaviour model of internal branding proposing that IBK results in higher levels of employee brand identification (EBI); this sense of identification then motivates employees to engage in both employee-related and brand- and customer-focussed behaviours (i.e. brand citizenship behaviour [BCB] and customer-oriented behaviour [COB]), which in turn foster employee performance. Design/methodology/approach: The hypotheses were empirically tested using a sample of 697 from services industry in Vietnam. Findings: The findings indicate a sequential mediation model in that employee brand knowledge affects employee performance (both objective and subjective measures) through EBI, BCB and COB. Employee brand knowledge results in higher levels of EBI; this sense of identification then motivates employees to engage in employee-related brand and customer-focussed behaviours (BCB and COB), which in turn foster employee performance. Practical implications: Firms should understand that IBK may not directly result in high levels of service performance, and instead should embrace the culture of self-driven positive brand-connection attitudes that motivate employees to engage in BCB and COB that are consistent with their sense of self. Originality/value: This study makes a unique contribution to the internal branding literature by unravelling a pathway that integrates employees’ self-related psychological mechanism (EBI) and employee-related brand and customer-focussed behaviours (BCB and COB) through which employee brand knowledge is converted into employee performance

Fe-Si networks and charge/discharge-induced phase transitions in Li2FeSiO4 cathode materials

Structural phase transitions of electrode materials are responsible for poor reversibility during charge/discharge cycling in Li-ion batteries. Using previously developed structural databases, we investigate a structural landscape for LixFeSiO4systems at x = 1. Starting with low-energy Li2FeSiO4 crystal structures, we explore the crystal structures of the material in different states of charge. The as-prepared Li2FeSiO4 materials adopt low energy structures characterized by two-dimensional (2D) Fe–Si networks. After the removal of one Li per formula unit to form LiFeSiO4, the structures with three-dimensional (3D) diamond-like Fe–Si networks become more energetically favorable without a significant impact on the charge capacity, which agrees with previous experimental and theoretical work. However, we reveal that the structure with a 3D diamond-like Fe–Si network can further transform into a new structure at x = 1. And the Li atom is hard to reinsert into these new structures. Consequently the system is prevented from returning to the Li2FeSiO4 state. We believe that the formation of this new structure plays an important role in the loss of reversible capacity of Li2FeSiO4 electrode materials.</p

Comparison of artemisinin suppositories with intravenous artesunate and intravenous quinine in the treatment of cerebral malaria.

Seventy-nine comatose cerebral malaria patients given standard supportive treatment were randomized to receive specific antimalarial chemotherapy of intravenous quinine, intravenous artesunate, or artemisinin suppositories. Artesunate and artemisinin reduced peripheral asexual parasitaemia significantly more rapidly than quinine (90% clearance time 16 h, 18.9 h and 34.5 h respectively), but did not significantly reduce the duration of coma or mortality. The rapid lowering of peripheral parasitaemia may not ameliorate complications already present. These results demonstrate that artemisinin suppositories are as effective as artesunate and quinine given intravenously, and have economic and practical advantages for the treatment of severe malaria in areas remote from major medical centres. However, large numbers of patients will need to be studied if differences in mortality between the 3 treatment groups are to be demonstrated

Measuring serum beta2-microglobulin to predict long-term mortality in hemodialysis patients using low-flux dialyzer reuse

Nguyen Huu Dung,1 Nguyen Trung Kien,2 Nguyen Thi Thu Hai,1 Phan The Cuong,1 Nguyen Thi Thu Huong,3 Dao Bui Quy Quyen,4 Nguyen Minh Tuan,4 Do Manh Ha,2 Truong Quy Kien,2 Nguyen Thi Thuy Dung,2 Pham Quoc Toan,2 Hoang Trung Vinh,2 Tomoko Usui,5 Le Viet Thang21Bach Mai Hospital, Ha Noi, Vietnam; 2Military Hospital 103, Ha Noi, Vietnam; 3Ha Noi Kidney Hospital, Ha Noi, Vietnam; 4Cho Ray Hospital, Ho Chi Minh, Vietnam; 5University of Tokyo Hospital, Tokyo, JapanPurpose: Beta2-microglobulin (&beta;2-M) is recognized as a surrogate marker relating to the mechanisms of dialysis-associated amyloidosis. Few studies have evaluated the association of serum &beta;2-M with clinical outcome in hemodialysis patients using high-flux type. However, study on patients using low-flux dialyzer reuse has not been done yet.Patients and methods: Using serum &beta;2-M level on predicting long-term mortality of hemodialysis patients was examined in 326 prevalent hemodialysis patients (45.59&plusmn;14.46 years, hemodialysis duration of 47.5 (26&ndash;79) months, 186 males and 140 females). The patients were divided into 3 groups with equal number of patients, according to their serum &beta;2-M levels: group A (n=109, serum &beta;2-M concentration &le;55.7 mg/L), group B (n=109, serum &beta;2-M level from 55.8 mg/L to 75.4 mg/L) and group C (n=108, serum &beta;2-M concentration &gt;75.4 mg/L).Results: During the follow-up period of 5 years, there were 75 all-cause deaths (23.0%). Kaplan&ndash;Meier analysis revealed that all-cause mortality in the higher &beta;2-M group was significantly higher compared to that in the lower &beta;2-M groups (p&lt;0.001). Serum &beta;2-M level was a significant predictor for all-cause mortality (AUC =0.898; p&lt;0.001; Cut-off value: 74.9 mg/L, Se=93.3%, Sp=92.9%).Conclusion: Serum &beta;2-M levels were a significant predictor of long-term mortality in hemodialysis patients, who use only low-flux dialyzers and reuse 6 times.Keywords: Beta2-microglobulin, mortality, hemodialysi

Malaria in injection drug abusers in Vietnam.

A prospective case-control study was conducted in a referral hospital in Ho Chi Minh City, Vietnam, to compare the clinical and laboratory features and outcome of severe falciparum malaria in injection drug abusers (IDAs) with those of patients who had acquired malaria by mosquito bite. From 1991 to 1996, 70 IDAs were admitted to the hospital, of whom at least 32 had acquired malaria by needle sharing. Although IDAs were more likely than control patients with severe malaria to be malnourished and to have coincident hepatitis B, hepatitis C, and human immunodeficiency virus infections, the overall rates of mortality, complications, and recovery were similar in the 2 groups. The route of malaria acquisition did not affect the outcome of severe malaria. The management of severe malaria in IDAs is similar to that for other patients