bluuebunny/crossref_metadata_2025 huggingface dataset:
Floristic diversity of woody stands of the Sudano Guinean Savannah of Mbam and Djerem National Park (PNMD), Cameroon
Authors: Christelle Dadem Gueguim , Martin Tchamba N. , Corneille FOTSO Roger
Published: December 2020

The combined effect of climatic deterioration and anthropogenic pressure has caused a gradual degradation of the natural resources of the Mbam and Djerem National Park. This phenomenon has not spared the woody stratum which constitutes in this region the main source of forage in the dry season. The rehabilitation of these ecosystems necessarily requires precise ecological knowledge, hence the interest in making a diagnosis of the floristic diversity of the woody stratum. The dendrometric sampling method was used for this study carried out in Mbam and Djerem National Park. This inventory consisted in systematically identifying all the woody species by height class in 3 sites according to factor gradients. This method made it possible to inventory a total of 1,596 trees, divided into 45 species belonging to 24 families. Statistical processing of data obtained in the field shows that the flora is dominated by the family of Euphorbiaceae, Combretaceae, Fabaceae and Rubiaceae group together the maximum of species with, respectively, 7 and 4 listed for the others. The richness of flora is more important in Kpayere which presents a weak similarity with Debiro.
Response of three tossa jute (Corchorus olitorius L.) cultivars produced in Benin to salinity stress at germination and young plant stages
Authors: Loko Belvida , Hambada Montcho Koffi David , Goudjo Mensah Armel Clément , Geoffroy Gouveitcha Mahougnon Baudouin , Wouyou Agapit , Kpinkoun Julien Koffi , Komlan Françoise Assogba , Gandonou Christophe Bernard
Published: December 2020

The response of three tossa jute cultivars Ordinaire, 5-Doigts and Acc : Sud 2 to salt stress was evaluated at germination and young plant stages. Five NaCl concentrations: 0; 30; 60; 90 and 120 mM NaCl were used. Seeds were submitted to NaCl in petri dishes and germination was checked every day during thirty days in a completely randomized design with four replicates. Four-week old plants were submitted in pots to the same five NaCl concentrations by irrigation every two days for two weeks in screen house. NaCl reduced seed germination rate in all cultivars from day 2 to day 30 and the germination index. At the end of the 30 days, salt stress reduced the final germination percentages with a significant difference among cultivars: cultivar 5-doigts was the least affected than the two other cultivars. Salt effect caused a reduction of young plant growth whatever the growth parameter considered with a significant difference among cultivars. The growth of cultivar Acc:Sud 2 was more affected by salt stress with the lowest salt tolerance index whereas that of cultivar Ordinaire was the least affected with the highest salt tolerance index. Thus, cultivar 5-Doigts appeared as the most resistant to salt stress at germination stage among the three cultivars; whereas cultivar Ordinaire followed by 5-Doigts was the most salt resistant at young plant stage.
Factors Affecting The Participation of Tammekkawatang Grazing Pasture Regency of Pinrang, South Sulawesi
Authors: Faharuddin Andi fitri , Siti Azizah , Umi Wisaptiningsih
Published: December 2020

Participation is an important component in the process of empowering a community, especially farmers. In this process, the community is supported to improve prosperity independently. The role of institutions as facilitators who accompany the empowerment process. In principle, the community is the perpetrator and the subject of development. it requires Information related factors that influence the participation of breeders in the Empowerment program so that the preparation of empowerment strategy can be more directional and the result will be more optimal. This research aims to determine the factors affecting the participation of farmers in the grazing Empowerment program as a reference to create a more interesting empowerment program. The research was conducted in the Pinrang district of Suppa and Mattirobulu sub-districts with samples of 147 breeders. The collection of research data is done using questionnaires and then carried out data using the SmartPLS statistics tool. The result of this research is known that the factors affecting the participation of farmers are the motivation and stakeholder role.
YAZILI BASINDA DEMANS HABERLERİ ÜZERİNE İÇERİK ANALİZİ UYGULAMASI
Authors: KARTAL Nazan , ERİGÜÇ Gülsün
Published: December 2020

Günümüzde yaşam standartlarının artmasıyla birlikte insan ömrünün uzaması sonucu yaşa bağlı hastalıklar da artış göstermektedir. Bunlardan birisi de demans hastalığıdır. Dünya Sağlık Örgütü (WHO)’ne göre, dünya genelinde yaklaşık 50 milyon insanın demans hastalığına yakalandığı bilinmekte ve bu rakamın 2050 yılına kadar 152 milyona ulaşması beklenmektedir. Bakımın çoğunluğunun aile tarafından sağlandığı demans hastalığının güncel maliyeti ise 818 milyar dolar olarak tahmin edilmektedir. Yine WHO verilerine göre demans hastalığı, günümüzde ölüm nedenleri arasında yedinci sırada yer almaktadır. Bu çalışmayla, demans hastalığının yazılı basında nasıl yer aldığının incelenmesi amaçlanmıştır. Çalışma kapsamında, öncelikle Türkiye genelinde yayın yapan tirajı en yüksek dört gazetede olarak belirlenen dört gazetenin Ocak 2016 ve Temmuz 2018 tarihleri arasında yayınlanan haberler “demans”, “bunama” ve “Alzheimer” anahtar kelimeleri kullanılarak taranmıştır. Belirlenen tarihlerde toplamda 532 haberin yer aldığı belirlenmiştir. Ana konusuna göre; en fazla gündem/magazin haberlerinin yer aldığı, ardından sırasıyla sağlık riskleri, korunma, teşhis ve tedavi ve demans ile ilgili politika haberlerinin yer aldığı saptanmıştır. Haberlerin içerdiği mesajlar açısından incelenmesi sonucu, en fazla demansa ilişkin farkındalık ve hastalığın topluma maliyeti ile ilgili haberlerin bulunduğu, bunu demanstan korunma ve demansın nedenlerine yönelik haberlerin izlediği ortaya konmuştur.
Imaging Features of Cervical Spinal Motion Segment Lesions before and after Surgery: A Case Report
Authors: Sorovikov Vladimir , Seliverstov Pavel
Published: December 2020

Spinal injuries remain a serious modern health problem that leads to a high level of disability and prehospital mortality. This clinical case of cervical fracture-dislocation demonstrates the diagnostic signs and the surgical approach.
Evaluation of Traumatic Knee and Shoulder Joint Ligaments with MRI among Adult Sudanese Patients
Authors: Masaad Shaza Mahgoub , Yousef Mohamed , Osman Hanady Elyas , Mahmoud Mustafa Z.
Published: December 2020

Background: Magnetic resonance imaging (MRI) is currently regarded as the reference standard for the diagnosis and evaluation of internal derangements of the knee and shoulder girdle. This study aimed to evaluate traumatic injuries of the knee and shoulder joint ligaments by MRI and classify the most common ligament injuries. Methods and Results: This study included 50 patients, who were presented in the Radiology Department of Modern Medical Center in Khartoum, in the period from October 2019 to January 2020. The sample was divided into two groups: shoulder joint group (Group 1, n=30) with an age range between 16 and 74 years and knee joint group (Group 2, n=20) with an age range between 16 and 77 years. The age group most affected with shoulder (46.7%) and knee joint (25%) injuries was 46-65 years. The injuries of the shoulder (40%) and knee joints (55%) were common in patients with body weight ranging from 71-80kg and >81kg, respectively. Different grades of partial meniscus tear of both shoulder and knee joints were noted as Grades 1 and 2 in 8.7% of cases, Grade 2 - 13%, Grades 2 and 3 - 34.8%, and Grade 3 - 30.4%. There were incidences of 27.3%, 0%, 54.5%, 15.20, 0%, and 3% for anterior cruciate ligament, posterior cruciate ligament, medial meniscus C-shape (M Me C), lateral meniscus C-shape (L Me C), MCL, and LCL tears in the knee joints of the affected patients. Conclusion: MRI revealed that injuries to the shoulder and knee joints were common in patients with body weight ranging from 71-80kg and >81kg, respectively. Different grades of partial meniscus tear of the shoulder and knee joints were noted though Grades 2 and 3 partial tears were the most common finding. Finally, it was noted that in the knee joints of the affected patients, the M Me C shaped tear was the major type of tear.
The Level of Certain Interleukins and Tissue Factor in Conditions of Intestinal Ischemia and Reperfusion in Rats
Authors: Artamonova Zoya , Namokonov Evgeny , Darenskaya Marina , Semenova Natalya , Kolesnikova Lyubov , Kolesnikov Sergey
Published: December 2020

Background: The aim of this study was to estimate the blood levels of interleukins (ILs) and tissue factor (TF) in rat blood when modeling acute mesenteric ischemia (AMI) in various stages and during reperfusion. Methods and Results: The study was performed on white non-linear male rats, weighing 200±25g. AMI was simulated by ligating the cranial mesenteric artery at the mesentery root. Then, at certain time intervals, a relaparotomy was performed, blood was collected, and the animals were subjected to reperfusion at different time intervals. During the experiment, the animals were divided into 3 groups depending on the time of ischemia (3 hours [n=10], 6 hours [n=10], and 8 hours [n=10]) followed by reperfusion after the indicated time of ischemia. The level of ILs (IL-6, IL-8, and IL-10) and TF in rat blood serum was determined by EIA. We found that AMI in rats is accompanied by pronounced changes in the immune system and the development of a systemic inflammatory reaction syndrome, which is aggravated by reperfusion. At the same time, the restoration of blood flow after 3-hour ischemia was characterized by an increase in the concentration of IL-6, IL-8, and IL-10; after 6-hour ischemia – by an increase in the IL-6, IL-8 content and TF, and stabilization of the IL-10 concentration. Reperfusion after 8-hour ischemia was accompanied by an increase in the IL-6 concentration, a decrease in the levels of IL-8, IL-10, and TF, which can lead to the progression of necrotic changes in the intestine. Conclusion: The detected changes can serve as laboratory markers that characterize the course and stage of acute mesenteric ischemia.
Production, Properties and Transit of Copper-Pectic Gel Particles through an Artificial Gastroenteric Environment
Authors: Shubakov Anatoly , Mikhailova Elena
Published: December 2020

Spherical copper-pectic gel particles (CuPGPs) were obtained from aqueous solutions of commercial apple pectin (AP) AU701 (2%, 4%) in the presence of copper ions (CuCl2, 1%-10%), and their morphological (diameter) and structural-mechanical (density) characteristics were studied. It was found that with an increase in the concentration of AP from 2% to 4%, the diameter of dry gel particles at all tested concentrations of copper chloride (1-10%) increased from 0.64-0.76 mm (2% AP) to 0.87-0.94 mm (4% AP), and that the density of dry gel particles with an increase in the concentration of AP also increased from 1.27-1.48 mg/mm3 (2% AP) to 1.42-1.55 mg/mm3 (4% AP). The swelling and degradation of the obtained CuPGPs in an artificial gastroenteric environment was studied. It has been established that the CuPGPs based on 4% AP with 10% CuCl2 have the highest degree of swelling in the acidic environment of the intestinal gastric fluid (SGF). CuPGPs, depending on the concentration of AP and copper ions, are degraded in different parts of the intestine—in simulated intestinal fluid (SIF) or simulated colonic fluid (SCF).
Association of Serum Uric Acid Levels with Components of Metabolic Syndrome: A Cross-Sectional Analysis in a Saudi Adult Population
Authors: Fawzy Manal , Abu AlSel Baraah.
Published: December 2020

Background: This study aimed to investigate the possible relations between serum uric acid (UA) and metabolic syndrome (MetS) and its components in a Saudi adult population sample. Methods and Results: This cross-sectional study enrolled consecutive adult MetS and non-MetS subjects (90 subjects in each group). Glycemic control indices (fasting blood sugar (FBS), HbA1c, insulin, HOMA-IR index), lipid profile/ratios, and renal function tests were also evaluated. Findings showed that serum UA was significantly higher in the MetS group (322±98.9) than non-MetS group (286±61.2) μmol/L. The fourth quartile of serum UA showed a higher frequency of MetS (73.3%) and central obesity (82.2%), and higher mean values of TG and FBS as well as lower mean values for HDL-C relative to the first quartiles. Data stratification by sex showed consistent associations of BMI, abdominal obesity, HDL-C, TG/HDL-C, and serum creatinine levels with serum UA in both men and women. Serum UA at 310 μmol/L concentration might be a good predictor for MetS/its components in men. In contrast, at a cut-off level of 275.0 μmol/L, it could significantly predict only obesity and high FBS in women. Conclusion: Serum UA levels are associated with MetS and may predict MetS and/or its components at specific levels in a sex-dependent pattern in the study population.
Sperm Quality and Oxidative-Antioxidant Profile in Men Living in Different Regions of Siberia
Authors: Kurashova Nadezhda , Dashiev Bair , Kolesnikova Lyubov
Published: December 2020

Background: The aim of this study was to assess the sperm quality and oxidative-antioxidant profile in men living in different regions of Siberia Materials and Methods: The study involved 125 men of reproductive age: 40 men (mean age of 24.8 years) living in Ulan-Ude, 35 men (mean age of 24.1 years) in Irkutsk, and 50 men (mean age of 24.6 years) in Novosibirsk. All men belonged to the Caucasian race and were physically healthy. Methods of standard clinical examination of fertile and infertile men included: an ultrasonic scan of scrotum and prostate, macroscopic and microscopic examination of ejaculate, and biochemical analysis. The semen analysis was performed in accordance with the WHO recommendations (2010). The study of sperm quality included measuring the volume and pH of the ejaculate, the concentration of spermatozoa, the proportion of motile sperm of categories A and B, and lipid peroxidation-antioxidant activity products. Of the participants in the study, the group of somatically healthy men living in Irkutsk had the highest sperm count (mln per ml): 1.5 times more than men in Novosibirsk and 1.3 times more than men in Ulan-Ude. At the same time, in the group of men in Irkutsk, a significant increase in the concentration of α-tocopherol was revealed: 1.6 times more than the men in Ulan-Ude and 1.8 times more than the men in Novosibirsk. Conclusion: The conducted studies of the quality of ejaculate and the characteristics of LPO processes in men from different cities of Siberia show that place of residence and ecological-geographical position are not the main reasons determining reproductive dysfunction, but can be important factors affecting the functioning of the reproductive system and determining the heterogeneity of male infertility in conditions of anthropogenic pressure.
Mammographic Density Errors during Interpretation of Breast Examinations
Authors: Pavlova Tamara , Vasilyev Aleksandr , Buromsky Ivan
Published: December 2020

Background: This article discusses errors that may occur when radiologists deal with mammographic density (MD) and present their performance analysis in Russia. Methods and Results: The authors of this report have analyzed 24,485 mammographic reports for 20,000 female patients (aged 29-85 years) that were made in various healthcare facilities in the Russian Federation. In 249(1.7%) mammographic exam reports, we observed a wrong MD interpretation. Conclusion: Diagnostic errors during mammographic examination occur because the radiologists lack theoretical knowledge about MD. This lack, in turn, results in a decrease in the quality of medical care provided for female patients and an increase in the number of diagnostic iatrogeny.
Obstructive Sleep Apnea and COVID-19 Infection Comorbidity: Analysis of the Problem in the Age Aspect
Authors: Berdina Olga , Madaeva Irina , Rychkova Liubov
Published: December 2020

In the literature, there are suggestions of a possible mutual influence between obstructive sleep apnea (OSA) and the novel coronavirus disease 2019 (COVID-19). The aim of this review is to analyze data found in the literature related to pathogenetic aspects of the impact of OSA on COVID-19, and vice versa, and features of the course of this comorbidity in both adulthood and childhood. Information was searched in MEDLINE, PubMed, EBSCO, and RSCI databases, which presented some data for the connection between COVID-19 and OSA, as well as aspects of OSA and COVID-19 comorbidity for adults and the elderly. The common pathophysiological pathways leading to increased systemic inflammation and adverse consequences of OSA and COVID-19 infection do coexist and were revealed in detail. We paid special attention to aspects of this comorbidity in children and found that research in this area was lacking. Based on this information, it should be concluded that: 1) more pediatric studies of links between OSA and COVID-19 are urgently needed; 2) screening hospitalized COVID-19 patients with tools to detect OSA could identify those at risk for a severe course of these diseases and adverse outcomes; 3) treating OSA will allow increasing the likelihood of developing a robust and long-lasting post-COVID-19 adaptive immunity in these patients.
Prevalence of the Metabolic Syndrome in Patients With Type B Aortic Dissection 
Authors: Li Shuangshuang , Dong Jian , Yang Jin , Guo Renle , Rui Feng , Zhou Jian , Jing Zaiping
Published: December 2020

Background/Objective: The aim of this study is to detect the prevalence of metabolic syndrome (MS) and its components in type B aortic dissection patients. This study assessed the association of MS and its component with type B aortic dissection in Chinese patients.Methods: This cross-sectional prospective observation study consisted of 445 patients who were first diagnosed with type B aortic dissection. Demographic information, clinical symptoms and laboratory parameters were collected using a standard form.Results: Among the 445 TBAD patients 38.4% had MS. Hypertension was present in 78.2% of all TBAD patients. Hypertension, high fasting glucose and obesity were the most common combination of metabolic abnormalities (93%, 79.5% and 63.2%) in the TBAD patients, and a same phenomenon was seen in acute TBAD patients. But among chronic TBAD patients the most frequent individual components were hypertension, hyper- triglyceride and high fasting glucose (92.6%, 75%, and 70.6%). Presence of two or more components of the metabolic syndrome was common: 22.7% had one component, 31.9% had two components, 24.9% had three components, 10.8% had four components and 3.1% had five components. In TBAD, hypertension, obesity, triglycerides and FBG (fasting blood-glucose) were main risk factors for MS.ConclusionThis is the first study provided information on the prevalence and components of MS in the initial TBAD patients. Hypertension, high fasting glucose and obesity were the most common combination of metabolic abnormalities in TBAD patients.
A Ferroptosis-associated Gene Signature for the Prediction of Prognosis and Therapeutic Response in Luminal-type Breast Carcinoma
Authors: Peng Yang , Yu Haochen , Zhang Yingzi , Tang Zhenrong , Qu Chi , Tian Jiao , Zong Beige , Wang Yu , Ren Haoyu , Liu Shengchun
Published: December 2020

Background: Ferroptosis is a new form of regulated cell death (RCD), and its emergence has provided a new approach to the progression and drug resistance of breast cancer (BRCA). However, there is still a great gap in the study of ferroptosis-related genes in BRCA, especially luminal-type BRCA patients.Methods: We downloaded the mRNA expression profiles and corresponding clinical data of BRCA patients from the Molecular Taxonomy of Breast Cancer International Consortium (METABRIC) and The Cancer Genome Atlas (TCGA) databases. Then, we built a prognostic multigene signature with ferroptosis-related differentially expressed genes (DEGs) in the METABRIC cohort and validated it in the TCGA cohort. The predictive value of this signature was investigated in terms of mutations, copy number variations (CNVs), the immune microenvironment, tumor purity, related pathway and the probability of a response to immunotherapy and chemotherapy.Findings: The patients were divided into a high-risk group and a low-risk group by the ferroptosis-associated gene signature, and the high-risk group had a worse overall survival (OS). The risk score based on the 10 ferroptosis-related gene-based signature was determined to be an independent prognostic predictor in both the METABRIC and TCGA cohorts (HR, 1.41, 95% CI, 1.14-1.76, P = 0.002; HR, 2.19, 95% CI, 1.13-4.26, P= 0.02). Gene set enrichment analysis indicated that the term “cytokine-cytokine receptor interaction” was enriched in the high risk score subgroup. Moreover, the immune infiltration scores of most immune cells were significantly different between the two groups, and the low-risk group was much more sensitive to immunotherapy and chemotherapy. In addition, we found that amplifications on chromosome 12 accompanied by the deletion of chromosome 21 were enriched in the high-risk subgroup. Pathway score results suggest that the ferroptosis-related gene-based signature show differences in most breast cancer-associated phenotypes. Finally, a nomogram incorporating a classifier based on the 10 ferroptosis-related genes, tumor stage, age and histologic grade was established. This nomogram showed a favorable discriminating ability and might contribute to clinical decision-making for luminal-type breast carcinoma.
Intramedullary Cysticercosis- An Uncommon Entity Even in the Presence of Intracranial Neurocysticercosis
Authors: Walia Gurpreet Kaur , Baveja Puneet , Verma Shipra , Kumar Sanjay , Jain Atul , Dudhal Rahul
Published: December 2020

Neurocysticercosis (NCC) is described as the central nervous system involvement by a parasitic infection caused by a nematode, Taenia solium. By far, NCC is the most common parasitic infection of central nervous system in the world. In the developing countries like India, NCC is a leading cause of epilepsy in all age groups. Here, we present a case of a 36-year-old male who was a known case of multiple NCC involving the brain having cognitive dysfunction and presented with difficulty in walking and sudden onset weakness of right lower limb. On contrast enhanced MRI of spine, an intramedullary lesion was seen at D7- D8 level, which was confirmed on histopathological examination of the excised tissue as NCC. During clinical follow-up, the patient has shown significant neurological improvement.
Case Report of An Unusual Mediastinal Mass - Thymolipoma
Authors: Raju Sreeja , S Divya , Savithri M C , KK Ajaykumar , Nair Gayathri G
Published: December 2020

Thymolipomas are rare, slow-growing, benign anterior mediastinal neoplasms which are very often detected incidentally. Here we present a case of a 47 year old female who presented with chest discomfort and radiology revealed an anterior mediastinal mass. Total thymectomy was done and histopathology showed features consistent with thymolipoma. Very few cases of thymolipomas have been reported in Indian and world literature.
Determinants of pension capital management in Poland
Authors: Trippner Paweł
Published: December 2020

The pension system’s construction is an important element of the public finance system and the state budget policy. It is a relevant and important topic from the perspective of the level of cash benefits for future retirees after they finish their professional careers.The aim of the paper is to present and analyze the evolution of solutions in the construction of the pension system in Poland since its first reform in 1999. The paper analyzes various options of investing for future pensions allowed by law in Poland. Simulations of the levels of future pension benefits are based on different variations, including membership or non-membership in an Employee Capital Plan and membership or non-membership in an Individual Retirement Account after the liquidation of Open Pension Funds.According to the calculations, the future pensioner can count on the total payment from the commercial pillars, assuming the average life expectancy in Poland is reached: PLN 230,100 (Option I), PLN 346,698 (Option II), PLN 187,643 (Option III), and PLN 304,240 (Option IV), respectively.It is an emphasized fact that ensuring the living standard’s expected level after reaching retirement age is strictly dependent on voluntary investments for future benefits during professional activity.
Study on the influence of vegetation change on runoff generation mechanism in the Loess Plateau, China
Authors: Zhang Xueli , Yu Yue , Hu CaiHong , Ping Jianhua
Published: December 2020

In recent years, the amount of water and sediment in the Yellow River Basin has dropped drastically. This paper selected 125 rainfall and flood data points from 1965 to 2015, combined hydrological methods and mathematical statistics to analyze the hydrological factors and runoff generation mechanism, and combined the underlying surface conditions of the Gushanchuan Basin. The characteristics of change revealed the temporal and spatial variation characteristics and related factors of the runoff generation mechanism in the basin. The results showed that the Gushanchuan Basin is still dominated by HOF runoff, but the runoff generation mechanism has also changed with changes in the underlying surface, which are reflected in increased runoff components, the reduced proportion of HOF runoff, and the increased proportion of saturation-excess overland flow (SOF) runoff and mixed runoff. We analyzed the variation law of underlying surface in the basin, which indicated that the increase in the forest grass area was the main factor affecting changes in the watershed runoff generation mechanism. This research will enable a deeper understanding of the runoff generation mechanism of the main soil erosion areas in the Loess Plateau, and reveal variations in the runoff generation mechanism in the Yellow River.
Removal characteristics of dissolved organic matter and membrane fouling in ultrafiltration and reverse osmosis membrane combined processes treating the secondary effluent of wastewater treatment plant
Authors: Liu Jianwei , Zhao Mengfei , Duan Cui , Yue Peng , Li Tinggang
Published: December 2020

The widespread implementation of municipal wastewater treatment and reuse must first ensure the safety of reused wastewater. The effluent of the municipal wastewater treatment plant contains a large amount of dissolved organic matter (DOM), which adversely affects the reuse of wastewater. In this study, the ultrafiltration (UF) + reverse osmosis (RO) process was used to treat the secondary effluent from wastewater treatment plants. The relationship between the removal performance, membrane fouling of the UF + RO process, and DOM removal characteristics of influent were studied. The results show that DOM can be removed effectively by UF + RO process. The UF mainly removes DOM with a molecular weight greater than 10 kDa, while RO has a significant removal effect on low-molecular-weight DOM, which mainly causes UF and RO membrane fouling. The UF + RO process has a significant removal rate on fulvic acid, humic acid, tyrosine, and tryptophan, and the order is humic acid > fulvic acid > tyrosine > tryptophan. Fulvic acid contributed the most to the UF membrane fouling, while fulvic acid and protein-like proteins contributed mainly to the RO membrane fouling.
Zinc-bearing dust derived non-toxic mixed iron oxides as magnetically recyclable photo-Fenton catalyst for degradation of dye
Authors: Gao Jian-ming , Ma ShuJia , Du Zongyuan , Cheng Fangqin , Li Peng
Published: December 2020

In this paper, comprehensive utilization of hazardous zinc-bearing dust for preparation of non-toxic mixed iron oxides as a magnetically recyclable photo-Fenton catalyst for degradation of dye by a facile solid state reaction process was proposed. The as-prepared samples were characterized by X-ray diffraction (XRD), Raman spectra, ultraviolet and visible (UV-Vis) spectra and Physical Property Measurement System (PPMS), and the degradation performance of as-prepared catalysts was also tested and analyzed. The results show that spinel ferrite coexisting with or without Fe2O3 was the predominant phase in the as-prepared samples, which were confirmed by Raman analysis. The as-prepared samples presented high degradation efficiency (about 90%) of rhodamine B (RhB) in the presence of hydrogen peroxide (H2O2) with visible light irradiation, owing to the synergistic effect of photocatalyst reaction and Fenton-like catalyst reaction during the degradation process. The mixed iron oxides also presented stable structure and exhibited excellent reusability with a degradation efficiency of 87% after the fifth cycle of reuse. Importantly, the heavy metals in the zinc-bearing dust could be fixed in the stable spinel structure. This paper could provide a simple approach for comprehensive utilization of zinc-bearing dust to synthesize non-toxic mixed iron oxides as a magnetically recyclable photo-Fenton catalyst for degradation of dye.
Consumer perceptions of B corporations, purpose-driven brands and cause-related marketing campaigns: Knowledge, acceptance and appreciation at the time of purchase
Authors: Bianchi Enrique Carlos , Daponte Gaspar Gracia , Canziani Cristian
Published: December 2020

For the Argentine case, studies that identify increasing implementation of three major CSR triple-impact strategies—B corporations, purpose-driven brands and marketing, and cause-related marketing—focus predominantly on supply. The present study seeks to identify consumer perceptions of these three triple-impact strategies in terms of recognition, knowledge, appreciation, and prioritization at the time of the purchase in the Argentine market. A quantitative investigation was carried out, based on a nationwide panel of 400 citizens. The results show that a majority of participants do not recognize the concepts of purpose-driven brands or the concept of B corporations. Many express difficulties in identifying such initiatives due to disinterest, ignorance, and/or lack of availability/exposure. In addition, there were non-significant differences in terms of generations, socioeconomic level, and sex. On the other hand, almost half of the panel has some familiarity with cause-related marketing campaigns, given the association with NGOs to which participating companies may donate or fund-raise. The results, particularly the limited overall recognition of these concepts, has management implications in a context of recession and spending restrictions.
Barriers and opportunities for the transition to a circular economy. A case study of Chilean cooperatives
Authors: Cea-Valencia Jorge , Villegas-Huencho Adriana , Sion-Sierra Rodrigo
Published: December 2020

The linear use–consumption–waste production model does not make allowances for resource limitation or loss, or the associated pollution. The concept of the circular economy (CE) emerged as an alternative to this model. In recent times, the CE has awoken considerable interest and discussion among academics, enterprises, and governments given its connection with sustainable development and its potential impact on the economic, social, and environmental levels. At present there is no precise and established definition of the CE as a concept, and though this new paradigm could proffer a host of benefits for the organizations who integrate it into their business model, it might also bring about difficulties or challenges. The main aim of this study is to identify barriers and opportunities for the transition to the CE based on a case study of cooperatives in Chile. The study employs the qualitative methodology of social discourse analysis, complemented by a literature review and interviews with CE experts. Five categories were constructed to guide the interviews and subsequent analysis: (i) knowledge, (ii) technological, (iii) structural, (iv) operational, and (v) financial. A total of ten interviews were conducted across the three specific cases selected. The data analysis was conducted using Atlas TI8 software. The results obtained for each case study point to gaps and opportunities in the five categories, and, more generally, in the legal and cultural spheres.
TENSÕES NO ENSINO DO BALÉ CLÁSSICO: NOTAS ETNOGRÁFICAS
Authors: Abreu Fernanda Ferreira de
Published: December 2020

Este artigo é resultado de trabalho de campo realizado numa academia de dança de Niterói (RJ) por meio de “participação observante” e entrevistas com professoras de balé clássico. Visa apresentar as dinâmicas de sociabilidade que se produzem nesse espaço, geralmente ofuscado por contextos profissionais, apesar de ser a principal alternativa das pessoas que trabalham com o balé clássico ou fazem aula desta modalidade de dança. Busca-se compreender como os termos disciplina e descontração são acionados e colocados em relação em um contexto de ensino que não tem por objetivo a formação de bailarinos clássicos profissionais; o que é analisado à luz da “tensão entre iluminismo e romantismo” na cultura ocidental moderna.
DEVOÇÃO NO CÍRIO FLUVIAL DE ORIXIMINÁ: “BRINCADEIRAS”, “APERREIOS” E REZAS PARA SANTO ANTÔNIO
Authors: Reis Marla Elizabeth Almeida , Pedrosa Dyedre Alves , Rufino Márcia Regina Calderipe Farias
Published: December 2020

Este trabalho tem como objetivo etnografar eventos de devoção que ocorrem no círio fluvial de Oriximiná/PA, região Norte do Brasil, em especial a prática de “aperrear” o santo. Na ânsia de alcançar a benção desejada, usam-se diversos métodos de constrangimento do santo, como, por exemplo, esconder o menino Jesus do colo do santo, virá-lo para a parede ou pendurá-lo de cabeça para baixo, guardá-lo no congelador ou escondê-lo em um local escuro. Esses “aperreios” duram até o santo realizar o pedido. Para tanto, foi realizado trabalho de campo em 2017 com observação participante, coleta de dados com entrevistas abertas e conversas informais com trinta e dois interlocutores, registro fotográfico, material histórico de acervos pessoais e levantamento de dados bibliográficos pertinentes ao tema. O círio inicia-se no primeiro domingo e encerra-se no terceiro domingo de agosto. Trata-se de um emaranhado de eventos interligados que movem a cidade de Oriximiná e as comunidades do entorno para ritos de devoção, como colocar as barquinhas na água, o círio fluvial, a peregrinação, rezas, promessas e trabalhos para o santo. Nesse contexto, a ação das devotas que buscam o auxílio do santo para contrair um casamento revelou-se notável, com práticas de devoção particulares como o “aperreio”, as rezas e as simpatias.
A QUESTÃO DA HISTÓRIA E OS LAUDOS ANTROPOLÓGICOS: O CASO DA COMUNIDADE QUILOMBOLA RIO DOS MACACOS (BA)
Authors: Santos Flavio Luis Assiz dos
Published: December 2020

Os laudos antropológicos de identificação e delimitação territorial quilombola são produzidos a partir do manejo de um arsenal teórico-metodológico que opera necessariamente com categorias analíticas da história e da antropologia, num diálogo incessante e que está produzindo efeitos importantes tanto para as comunidades estudadas, como para estes dois campos disciplinares. Este artigo, que tomou como referência o laudo antropológico da comunidade quilombola de Rio dos Macacos, localizada entre os municípios de Simões Filho e Salvador (BA), analisou como se deu o diálogo entre esses dois campos de saber, articulado com uma discussão teórica sobre o tema.
Adoção de práticas ambientais a partir da atividade turística: a rota de turismo rural Pelotas colonial
Authors: Porto de Souza Tatiana , Oliveira da Rosa Liciane , Da Silva Gonçalves Carolina , Bilhalva Corrêa Luciara , Silva Pereira Gisele
Published: December 2020

A pesquisa propõe-se a analisar a contribuição do turismo na realização de práticas ambientais pelos empreendimentos turísticos da Rota de Turismo Rural denominada Pelotas Colonial, situada no município de Pelotas, no Estado do Rio Grande do Sul/Brasil. Trata-se de uma pesquisa descritiva, de caráter quali-quantitativo, na qual a entrevista estruturada e a observação foram os instrumentos de coleta dos dados. As entrevistas foram realizadas com dez responsáveis, dos quatorze empreendimentos pertencentes à Rota Pelotas Colonial, abordando a gestão dos resíduos sólidos nesses estabelecimentos. Por fim percebe-se que, apesar dos entrevistados considerarem que a educação ambiental é a mais relevante contribuição do turismo, notou-se a falta de conhecimento quanto às ações ambientais e como desenvolvê-las, além de conhecimentos teóricos e normativos a respeito do meio ambiente.

Palavras-chave: Turismo Rural. Práticas Ambientais. Gestão dos Resíduos Sólidos. Pelotas. Brasil.
Precarização do trabalho no setor de eventos: um estudo inicial sobre os impactos para os trabalhadores e empresas
Authors: De Oliveira Silva Marcella , Bantim Natasha , Maciel Costa Maria Angélica
Published: December 2020

Esse trabalho tem como objetivo discutir a precarização nas relações de trabalho em um dos ramos mais relevantes do turismo: o setor de eventos. Apesar de ocupar posição econômica estratégica e proporcionar visibilidade dos destinos no mercado global, o setor se mantém, em grande parte, através de relações de trabalho terceirizadas, temporárias e informais. Essas relações são advindas do modelo financeiro internacional, de acumulação flexível do capital, onde o contrato de trabalho com todos os direitos e obrigações previamente definidos e inalterados ao longo de sua duração, vem sendo trocado por modelos menos rígidos, a partir da chamada ‘reestruturação produtiva’. Para exemplificar essas relações, foi analisada uma empresa localizada no Rio de Janeiro (RJ), especializada em orientação de público em eventos e seus contratados. Verificou-se a percepção de clientes e funcionários sobre os serviços prestados e a percepção dos trabalhadores freelancers sobre a contratação e estratégias de capacitação. Identificou-se elementos pouco criteriosos na contratação dos funcionários e no treinamento destes, demonstrando fortes indícios de precarização nas relações trabalhistas estabelecidas entre empresa e trabalhadores, incluindo remuneração com valores baixos e longas jornadas de trabalho. Apesar disso, a empresa parece não se importar com as consequências na qualidade do serviço prestado, já que o regime de terceirização acaba mitigando a percepção da responsabilidade pelo serviço prestado e, consequentemente, gerando poucos danos à imagem da empresa perante o público.

Palavras-chave: Eventos.  Precarização do Trabalho. Reestruturação Produtiva.
DELIMITAÇÃO DAS UNIDADES GEOAMBIENTAIS DA GEODIVERSIDADE DO SETOR COSTEIRO SUDESTE DA ILHA DO MARANHÃO, MA- BRASIL
Authors: Rabelo Thiara Oliveira , Lima Zuleide Maria Carvalho , Nascimento Marcos Antônio Leite do
Published: December 2020

A geodiversidade, que corresponde à variedade de elementos como rochas, minerais, feições geomorfológicas e solos, se constitui como parte importante do sistema ambiental. A divisão de unidades geoambientais com base nas características da geodiversidade apresenta-se como ferramenta de pesquisa essencial para conhecer os processos e interações dos elementos abióticos de uma área, como é o caso setor sudeste da Ilha do Maranhão, que apresenta poucos estudos voltados para a sua geodiversidade. O objetivo da pesquisa foi delimitar as principais unidades geomabientais da área com base na geodiversidade local como forma de congregar informações semelhantes sobre os recursos abióticos e de aumentar o conhecimento sobre o mesmo. Utilizando a abordagem geossistêmica e a partir do levantamentos bibliográficos e cartográficos, uso de SIG´s e atividades de campo, foi feita a delimitação de três unidades geoambientais deste setor: Tabuleiros costeiros, Planície flúvio-marinha e Planície Costeira. Estima-se que este estudo seja base para próximas pesquisas sobre a temática e para o planejamento e ordenamento territorial da área.
La influencia del tamaño inicial del polvo de Óxido de Circonio en fase tetragonal estabilizado con Óxido de Itrio en la formación de una Barrera de protección térmica
Authors: Zavaleta Tisnado Jhonattan Omar , Bondareva Olga Sergeevna
Published: December 2020

En este trabajo se estudian los efectos en las propiedades de porosidad y microdureza al usar distintos diámetros de polvos de ZrO2 +8% Y2O3 (menores a 40 µm, entre 40 a 60 µm y mayores a 80 µm) a depositar en la capa superior de un sistema TBC (barrera de protección térmica) de doble capa conformado por NiCrCoAlY y ZrO2 +8% Y2O3 usando el proceso de pulverización en plasma, con el propósito de encontrar el polvo adecuado y factible de usar como capa superior. Para ello se utilizaron instrumentos como el Microscopio electrónico de barrido TESCAN Vega SB con microanalizador dispersivo INCA Energy ng electronic microscope con el cual se pudo detectar la porosidad en distintas zonas de evaluación de la capa superior y el durómetro de Vickers para medir la microdureza. Comprobándose que con diámetros de partículas menores a 40 µm las propiedades anteriormente mencionadas son las adecuadas para la conformación de la capa superior de ZrO2 +8% Y2O3.
Особенности транспорта электронов в двумерных квантовых сверхрешетках с неассоциативным законом дисперсии
Authors: Орлов М.Л. , Орлов Л.К.
Published: December 2020

Для двумерной квантовой сверхрешетки с негармоническим законом дисперсии электронов изучены анизотропия проводимости и вид вольт-амперной характеристики для различных относительно осей сверхрешетки направлений тока и прикладываемого к структуре поля. Для разных режимов протекания тока обсуждаются анизотропия характеристик и условия появления многозначных вольт-амперных характеристик. Показано, что отклонение закона дисперсии электронов в двумерной квантовой сверхрешетке от гармонического в сильном постоянном электрическом поле оказывает заметное влияние на вид вольт-амперных характеристик двумерной квантовой сверхрешетки. Появление в сильном поле нескольких всплесков тока связано как с перемешиванием линий тока для ортогональных относительно прикладываемого поля направлений, так и с транспортом электронов по уровням штарковских лестниц, формируемых в разных долинах мини-зоны. Ключевые слова: двумерные сверхрешетки, неассоциативный закон дисперсии, анизотропия, постоянное электрическое поле, вольт-амперная характеристика, штарковские состояния.
Влияние конструкции активной области и волновода на характеристики лазеров на основе структур квантовые ямы-точки InGaAs/GaAs
Authors: Шерняков Ю.М. , Гордеев Н.Ю. , Паюсов А.С. , Серин А.А. , Корнышов Г.О. , Надточий А.М. , Кулагина М.М. , Минтаиров С.А. , Калюжный Н.А. , Максимов М.В. , Жуков А.Е.
Published: December 2020

We study edge-emitting lasers with the active area
based on novel InGaAs/GaAs quantum heterostructures of transitional
dimensionality referred to as quantum well-dots, which are
intermediate in properties between quantum wells and quantum
dots. We show that the rate of the lasing wavelength blue-shift
occurring with the reduction in cavity length decreases with an
increase in the number of quantum well-dot layers in the active
region and the optical confinement factor. In the laser based on
10 quantum well-dot layers, the position of the lasing wavelength
remains in the optical region corresponding to the emission from
the ground state down to the cavity lengths as short as 100 μm.
In the devices based on a single quantum well-dot layer and/or
with low optical confinement factor, lasing directly switches from
the ground state to the GaAs waveguide states omitting excited
state lasing with decrease in cavity length below 200 μm. Such an
effect has not been observed in quantum well and quantum dot
lasers and is attributed to the abnormally low density of excited
states in quantum well-dots.
Индуцированные флуктуациями фазовые переходы и скирмионы в сильно коррелированных Fe-=SUB=-1-x-=/SUB=-Co-=SUB=-x-=/SUB=-Si с нарушенной кристаллической структурой типа В20
Authors: Повзнер А. А. , Волков А.Г. , Ноговицына Т.А. , Бессонов C.А.
Published: December 2020

Concentration and temperature transitions in strongly correlated Fe1-хCoxSi alloys with the Dzyaloshinsky-Moriyya (DM) interaction are considered within the framework of the spin-fluctuation theory and taking into account the results of LDA+U+SO calculations of the density of electronic states. It is shown that order-order concentration transitions with a change in the sign of the left-handed spin chirality (at x <0.2) to right-handed (at 0.2≤x<0.65), and again to left-handed, are associated with a change in the sign of the intermode interaction parameter. At the same time, it was indicated that in the region of compositions Fe1-хCoxSi 0.2≤x<0.65, temperature-prolonged first-order phase transitions appear, accompanied by the appearance of an intermediate temperature region of spin short-range order with uncompensated local magnetization and DM interaction. In an external magnetic field in this temperature range at 0.2<x<0.65, skyrmion microstructures appear. At x=0.65, the intermode interaction parameter becomes zero, and the long-range order becomes ferromagnetic (since the experiment implies compensation for the DM interaction). Instead of a prolonged first-order transition, a second-order temperature transition occurs at х=0.65. The constructed (h-T) diagrams of the magnetic states of Fe1-хCoxSi agree with the experiment.
ЭПР и люминесценция пористого кремния
Authors: Демидова Н.Е. , Демидов Е.С. , Карзанов В.В.
Published: December 2020

There are presented research data of ESR, photoluminescence (PL) and carrent transport in porous silicon (PS) on KDB-0.3 and KES-0.01 Si, oxidized by10 minute isochronous thermal annealing on air at temperatures Tann from 20°С to 900°С and also in HNO3 for the purpose of the further clearing of Pb - centres nature of no radiating recombination. Maximum quantum yield of PL was observed at chemical oxidation of the PS on silicon of KDB-0.3 mark.. Anticorrelation of PL and ESR intensities of Pb - centres in the range of Tann = (20-300) °С takes a place. . Nonmonotonic dependence of ESR intensity of Pb - centres vs Tann with a minimum nearby 700°С is found out. Weak PL in PS with Tann nearby 700°С at minimum of ESR of Pb - centres means occurrence with annealing of other no radiating recombination centres. Falling of conductivity of PS with growth of Tann is connected with disintegration of Si fibres in Ps on small granules through which there is a discrete tunneling of current carriers.