bluuebunny/crossref_metadata_2025 huggingface dataset:
Khảo sát sự tích lũy Pb từ môi trường tự nhiên lên cá rô phi và đánh giá rủi ro sức khỏe đối với người sử dụng
Authors: Nguyễn Minh Trí , Trần Thị Như Xuân , Nguyễn Hải Phong ,   Trường Đại học Khoa học, Đại học Huế,   Trường Đại học Khoa học, Đại học Huế,   Trường Đại học Khoa học, Đại học Huế
Published: January 2021

Cá Rô phi là món ăn râ´t phổ biến trong bữa cơm hàng ngày của nhiều gia đình ở Việt Nam hiện nay, tuy nhiên những nghiên cứu về mức độ tích lũy kim loại chì (Pb) trong cơ thể của loài cá này vẫn chưa được quan tâm một cách cụ thể. Kết quả nghiên cứu cho thấy: cá Rô phi vằn được khảo sát ở một số hồ thuộc kinh thành Huế có hàm lượng Pb trong phần thịt ở mức cao so với tiêu chuẩn cho phép của Bộ Y tế nên không đảm bảo an toàn cho người sử dụng. Hệ số tích lũy sinh học BSAF của Pb ở mức thấp và có mối tương quan chặt về hàm lượng Pb trong trầm tích với Pb trong phần thịt của cá. Chỉ số rủi ro sức khỏe ở phần cơ của loài này đối với Pb là ở mức cao nên khi sử dụng cá khai thác từ các khu vực này sẽ ảnh hưởng xấu cho sức khỏe người sử dụng.
Xác định đồng thời nhóm Acid béo 2-Chloro-1,3-Propandiol (2-MCPD), 3-Chloro-1,2-propandiol (3-MCPD) và glycidol trong dầu thực vật bằng sắc ký khí ghép khối phổ GC-MS/MS
Authors: Nguyễn Thành Duy , Lê Thanh Tâm , Lý Tuấn Kiệt , Phú Minh Tấn , Nguyễn Quốc Hùng , Chu Vân Hải ,   Trung tâm dịch vụ phân tích thí nghiệm Tp. Hồ Chí Minh,   Trung tâm dịch vụ phân tích thí nghiệm Tp. Hồ Chí Minh,   Trung tâm dịch vụ phân tích thí nghiệm Tp. Hồ Chí Minh,   Trung tâm dịch vụ phân tích thí nghiệm Tp. Hồ Chí Minh,   Trung tâm dịch vụ phân tích thí nghiệm Tp. Hồ Chí Minh,   Trung tâm dịch vụ phân tích thí nghiệm Tp. Hồ Chí Minh
Published: January 2021

Trong những năm gần đây, một số chất gây ô nhiễm thực phẩm như 3-chloro-1,2-propanediol (3-MCPD) và ester acid béo 3-MCPD đã được tìm thấy trong nhiều loại thực phẩm. Trong đó, một lượng đáng kể các hợp chất acid béo 2-chloro-1,3-propanediol (2-MCPD) đã được phát hiện trong các loại dầu tinh chế. Kỹ thuật sắc ký khí ghép khối phổ được sử dụng để định lượng các acid béo dạng ester bao gồm 2-Chloro-1,3-propandiol (2-MCPD), 3-Chloro-1,2-propandiol (3-MCPD) và glycidol trong dầu. Mẫu được chuẩn bị bằng cách sử dụng các nội chuẩn bao gồm 3-MCPD-ester-d5 (rac 1,2-bis-palmitoyl- 3-chloropropanediol-d5), 2-MCPD-ester-d5 (1,3-Distearoyl-2-chloropropanediol-d5) và Glycidyl sterate-d5, tiến hành 2 bước ủ mẫu bằng dung dịch NaBr/H2SO4 và H2SO4/MeOH, trích ly với dung môi ethyl acetate, n-hexan để chuyển đổi Glycidyl ester thành MCPD và glycidol dạng tự do trong mẫu trước khi sử dụng dẫn xuất phenylboronic acid. Giới hạn định lượng là 0,1 mg/kg tương ứng, hiệu suất thu hồi ở nồng độ 0,1 mg/kg khoảng 80 - 120% với độ lặp lại và độ tái lập thấp hơn 10%.
Xác định hàm lượng Rutin trong một số cao dược liệu hoa hòe được sử dụng làm nguyên liệu trong các chế phẩm thực phẩm bảo vệ sức khỏe bằng phương pháp HPLC-UV
Authors: Nguyễn Thành Đạt , Nguyễn Thị Hồng Hạnh , Đàm Thị Thu , Chu Thị Thúy , Hoàng Thị Nương ,   Trung tâm kiểm nghiệm thuốc, mỹ phẩm, thực phẩm Hà nội,   Trung tâm kiểm nghiệm thuốc, mỹ phẩm, thực phẩm Hà nội,   Trung tâm kiểm nghiệm thuốc, mỹ phẩm, thực phẩm Hà nội,   Trung tâm kiểm nghiệm thuốc, mỹ phẩm, thực phẩm Hà nội,   Trung tâm kiểm nghiệm thuốc, mỹ phẩm, thực phẩm Hà nội
Published: January 2021

Xác định hàm lượng Rutin trong một số cao dược liệu Hoa hòe được xác định bằng phương pháp HPLC-UV. Điều kiện sắc ký sử dụng cột Agilent Zorbax Eclipse XDB C18 (150 x 4,6 mm; 5 µm), detector quang phổ tử ngoại ở bước sóng 257 nm, pha động: methanol - dung dịch acid acetic 1% (40: 60, v/v). Phương pháp có khoảng tuyến tính từ 4,97 - 298,47 µg/ml; Giới hạn định lượng 0,205 µg/ml; Độ thu hồi từ 99,87% - 102,3%. Ứng dụng phương pháp xác định hàm lượng Rutin trong các mẫu cao dược liệu Hoa Hòe: 3 mẫu cao chiết bằng cồn 30%, 3 mẫu cao chiết bằng cồn 70%, 3 mẫu cao chiết bằng nước, kết quả hàm lượng Rutin đạt từ 30,14% - 38,67%.
Ứng dụng phương pháp sắc ký lỏng ghép khối phổ tứ cực/ thời gian bay (UPLC-QTOF-MS) để giám sát tồn dư kháng sinh trong thịt cá
Authors: Nguyễn Văn Chính , Đặng Mai Tuyết Trang , Đoàn Thị Trúc Kha , Cao Thị Quỳnh Mai , Lê Văn Thiện , Bùi Huy Hoàng , Lâm Văn Tú ,   Chi Cục Thú y vùng VI,   Chi Cục Thú y vùng VI,   Chi Cục Thú y vùng VI,   Chi Cục Thú y vùng VI,   Chi Cục Thú y vùng VI,   Chi Cục Thú y vùng VI,   Chi Cục Thú y vùng VI
Published: January 2021

Tồn dư kháng sinh trong thịt và sản phẩm động vật là một trong những vấn đề đang nhận được sự quan tâm của cả xã hội vì những ảnh hưởng và nguy cơ mà nó gây ra cho sức khỏe con người, đặc biệt là tình trạng kháng kháng sinh. Hiện nay có rất nhiều loại kháng sinh đang được sử dụng trên thị trường với nhiều đặc tính sinh học và hóa học khác nhau. Do đó, việc giám sát, theo dõi các chất tồn dư trong thịt và sản phẩm động vật thông qua kiểm nghiệm mẫu là việc làm cần thiết. Các phương pháp sắc ký lỏng, ELISA trong thời gian qua là phương pháp được nhiều phòng thử nghiệm sử dụng để thực hiện phân tích mẫu tìm những chất, nhóm chất tồn dư cụ thể. Hiện nay, kỹ thuật Khối phổ thời gian bay (Time-Of-Flight - TOF) là một phương pháp mới, hiện đại có độ chính xác khối cao đã được một số phòng xét nghiệm ứng dụng để thực hiện kiểm nghiệm sàng lọc, phát hiện các chất, nhóm chất tồn dư trong thực phẩm. Trong nghiên cứu này, chúng tôi sử dụng hệ thống sắc ký lỏng ghép nối tứ cực thời gian bay (UPLC-QTOF-MS) để kiểm nghiệm sàng lọc, phân tích tồn dư kháng sinh, chất cấm khác nhau thuộc các nhóm như Sulfonamid, Quinolone, Tetracycline, Beta- Agonist… và một số loại độc tố khác trong mẫu thịt heo, thịt gà, thịt bò, cá. Kết quả bước đầu thực hiện kiểm nghiệm sàng lọc đối với 93 mẫu khảo sát được thu thập ngẫu nhiên đã phát hiện tồn dư một số loại kháng sinh như Amoxicillin, Cefalexin và Ampicillin.
Tình hình nhiễm vibrios PP.Phân lập từ thủy sản và nước nuôi tại Cái Bè - Tiền Giang
Authors: Huỳnh Ngọc Trưởng ,   Công ty TNHH Phân tích Kiểm nghiệm Việt Tín
Published: January 2021

Để xác định tình hình nhiễm Vibrio spp. trên thủy sản thương phẩm và nước nuôi tại huyện Cái Bè, tỉnh Tiền Giang, Việt Nam. Nghiên cứu phân lập 501 mẫu gồm 311 mẫu nước nuôi và 190 mẫu thủy sản thương phẩm. Kết quả cho thấy có 161 mẫu nước và 82 mẫu thủy sản có chứa 8 loài Vibrio spp., nhiều nhất là V. parahaemolyticus, V. mimicus và V. alginolyticus.
Nghiên cứu phương pháp xác định một số steviol glycosid trong cỏ ngọt bằng phương pháp sắc ký lỏng hiệu năng cao (HPLC)
Authors: Lưu Thị Huyền Trang , Đoàn Thị Thanh Hương , Vũ Thị Trang , Trần Cao Sơn , Nguyễn Thị Ánh Hường , Nguyễn Thị Minh Lợi ,   Viện Kiểm nghiệm an toàn vệ sinh thực phẩm quốc gia,   Trường Đại học Khoa học Tự nhiên ­ Đại học Quốc gia Hà Nội,   Viện Kiểm nghiệm an toàn vệ sinh thực phẩm quốc gia,   Viện Kiểm nghiệm an toàn vệ sinh thực phẩm quốc gia,   Trường Đại học Khoa học Tự nhiên ­ Đại học Quốc gia Hà Nội,   Trường Đại học Quảng Bình
Published: January 2021

Nghiên cứu này phát triển phương pháp xác định đồng thời một số steviol glycosid trong mẫu cỏ ngọt bằng HPLC. Các chất phân tích được chiết ra khỏi nền mẫu bằng methanol trong 60 phút và làm sạch qua cột HLB, tách bằng sắc ký lỏng sử dụng cột C18 (250 mm x 4,6 mm x 5 mm), định lượng bằng detector PDA. Thẩm định phương pháp cho kết quả đường chuẩn tuyến tính trong khoảng 1 ­ 100 µg/mL; RSD 1,39 ­ 2,85%; độ thu hồi 93 ­ 105% đạt yêu cầu của AOAC. Ứng dụng phương pháp phân tích 09 mẫu cỏ ngọt thu thập trên thị trường (bao gồm cỏ ngọt khô, nguyên liệu đường cỏ ngọt) cho thấy thành phần các steviol glycosid khác nhau trong các đối tượng mẫu khác nhau trong đó hàm lượng chiếm tỷ lệ lớn là steviosid và rebaudiosid A.
Bacteriological assessment of bottled drinking water in 5 provinces of central highland, VietNam
Authors: Nguyen Vu Thuan , Pham Van Doanh , Nguyen Thi Thu Hien ,   Tay Nguyen Institute of Hygiene and Epidemiology,   Tay Nguyen Institute of Hygiene and Epidemiology,   Tay Nguyen Institute of Hygiene and Epidemiology
Published: January 2021

The assessment of the bacteriological quality among 390 samples of bottled drinking water was studied. The samples were tested for Escherichia coli, Clostridia, total Coliform, Streptococci feacal and Pseudomonas aeruginosa. The rates of microbial contamination in bottled drinking water were of 56.7% (2017) and 50.7% (2018). The samples failed to meet QCVN drinking water standard of acceptable limits of bacterial presence including Pseudomonas aeruginosa (41.5%), total Coliform (11.8%), Clostridia (4.6%); Escherichia coli (4.9%) and Streptococcifeacal (1.3%). It is necessary to strengthen the inspection, supervision, propagation, and education that give warnings, ensure water quality and raise the awareness of producers, traders and consumers.
Simultaneous determination of fatty acid esters 2-chloro-1, 3-propandiol(2-mcpd), 3-chloro-1,2- propandiol(3-mcpd) and glycidol in vegetable oils by gas chromatography mass spectrometry GC-MS/MS
Authors: Le Thanh Tam , Nguyen Thanh Duy , Ly Tuan Kiet , Phu Minh Tan , Nguyen Quoc Hung , Chu Van Hai ,   Center of analytical services and experimentation of Ho Chi Minh City,   Center of analytical services and experimentation of Ho Chi Minh City,   Center of analytical services and experimentation of Ho Chi Minh City,   Center of analytical services and experimentation of Ho Chi Minh City,   Center of analytical services and experimentation of Ho Chi Minh City,   Center of analytical services and experimentation of Ho Chi Minh City
Published: January 2021

The food contaminants including 3-chloro-1,2-propanediol (3-MCPD) and 3-MCPD fatty acid esters have been a matter of great concern in the past few years due to their toxicity and their occurrence in numerous foods. Recently, significant amounts of the isomeric compounds 2-chloro-1,3-propanediol (2-MCPD) fatty acid esters have been detected in refined oil samples. Gas Chromatography (GC) coupled with mass spectroscopy (MS) was used for the quantification of fatty acid esters of 2-Chloro-1,3-propandiol (2-MCPD), 3-Chloro-1,2- propandiol (3-MCPD) and glycidol in oil. Internal standards including 3-MCPD-ester-d5 (rac 1,2-bis-palmitoyl-3-chloropropanediol-d5), 2-MCPD-ester-d5 (1,3-Distearoyl-2- chloropropanediol-d5) and Glycidyl sterate-d5 were added to samples. Spiked samples were, then, incubated in NaBr/H2SO4 and H2SO4/MeOH solutions. They were, eventually, extracted with ethyl acetate and n-hexane solvents in order to convert Glycidyl esters to free MCPD and glycidol in samples before using phenylboronic acid derivative. The limit of quantitation was of 0.1 ppm (mg/kg). The recoveries at the concentration of 0.1 mg/kg ranged from 80 to 120% and the repeatability and reproducibility were less than 10%.
Food hygiene and safety at the cafeteria kitchens in Nam Dinh province, 2018
Authors: Le Loi , Nguyen Thi Tam , Hoang Tien Cuong , Tran Thi Huong ,   Department of Food Hygiene and Safety of Nam Dinh province,   Department of Food Hygiene and Safety of Nam Dinh province,   Department of Food Hygiene and Safety of Nam Dinh province,   Nam Dinh Nursing University
Published: January 2021

Our servey on food hygene in 65 cafeteria kitchens with 200 or more servings in Nam Dinh province (2018) showed that: 36.7% of kitchens are located in industrial area, the rest are scattered in 10 districts and center of the city. There were 97.7% of kitchen shaving legal documents, of which 100% of employees were given periodic health checks and certified knowledge of food safety and hygiene; and 93.8% of kitchens had three-step verification records as prescribed. Regarding basic sanitation: 75.9% of kitchens met the requirements, of which 86.2% were designed according to the 1-way principle; 83.1% arranged separate room to change work wear clothes; 58.5% were equipped to prevent insects and pests; 73.8% used trash bins with lids. Regarding equipment and tools: 93.3% of kitchens met the requirements, of which 100% classified tools that were exclusively used for raw, cooked, and stored food samples; 67.7% had qualified containers for food and drinks; 83.1% of kitchens arranged hand washing sinks for employees. Regarding human resourse conditions: 91.2% of employees met the requirements, of which 63.8% had enough labor protection; 99.3% had short nail-cut and did not wear jewelry; 95.3% wore gloves when sharing food. Regarding food conditions: 78.2% of kitchens met the requirements, of which 92.3% signed contracts with food suppliers; 84.4% periodically tested the water quality. The rate of administrative managers of the enterprise (1) having right general knowledge about food hygiene and safety was of 81.7%; (2) strictly practicing food safety and hygiene was of 79.4%. The rate of kitchen managers (1) having right knowledge about food safety and hygiene was of 90.2%; (2) strictly practicing food safety and hygiene was of 87.8%; The rate of kitchen workers having right general knowledge about food hygiene and safety was of 82.9%. However, only 51.5% of them knew the best time for using food after processing; 91.2% had proper practice and 63.8% used full labor protection while working.
Determination of rutin content in sophora japonia L. Extracts used as raw material in supplements by high performance liquid chromatography
Authors: Nguyen Thanh Dat , Nguyen Thi Hong Hanh , Dam Thi Thu , Chu Thi Thuy , Hoang Thi Nuong ,   Hanoi Drugs, Cosmetics, Food Quality Control Center,   Hanoi Drugs, Cosmetics, Food Quality Control Center,   Hanoi Drugs, Cosmetics, Food Quality Control Center,   Hanoi Drugs, Cosmetics, Food Quality Control Center,   Hanoi Drugs, Cosmetics, Food Quality Control Center
Published: January 2021

An HPLC-UV method was proposed in order to determine Rutin in Sophora japonica L. extract samples (3 samples extracted with 30% ethanol, 3 samples extracted with 70% ethanol and 3 samples extracted with water). The chromatographic conditions were: Agilent Zorbax Eclipse XDB C18 Column (150 x 4.6 mm, 5 µm); UV-Vis detector (257 nm); mobile phase: a mixture of methanol and 1% acetic acid solution (40:60, v/v). The linear range was of 4.97 - 298.47µg/mL; the LOQ was of 0.205 µg/mL and the accuracy was within 99.87% - 102.3%. The method was proved to be suitable for the determination of Rutin in Sophora japonica L. extracts. Rutin content in samples varied from 30.14% to 38.67%.
Evaluation of food contamination in Dak Lak province from 2014 - 2018
Authors: Truong Huu Hoai ,   Dak Lak Department of Food Safety and Hygiene
Published: January 2021

Statistics of monitoring results of food-safety hazards of Dak Lak Department of Food Safety and Hygiene from 2014 - 2018 showed that: The general food contamination rate was of 28.9%, of which microbial contamination was of 39.6%; and chemical contamination was of 20.9%. Edible ice has the highest rate of microbial contamination (90.6%); Fried cooking oil samples have the highest chemical contamination rate of 51.1%. E. coli contamination rate accounted for 66.2%; Coliforms contamination rate accounted for 53.5%. The rate of borax contamination in spring rolls was 23.4%. The ratio of fried cooking oil contaminated by friable was 51.1%. The ratio of methanol contamination in manual production alcohol was 13.7%.
Lead accumulation in some snails used as food at Huong river, Hue city
Authors: Nguyen Minh Tri , Nguyen Viet Thang , Vo Dinh Ba ,   University of Science, Hue University,   University of Science, Hue University,   University of Science, Hue University
Published: January 2021

In Hue City, several river snails are popularly processed into dishes. However, former studies have proved that this group of animals can accumulate heavy metals in their bodies at much higher levels than in the external environment, making them harmful to consumers’ health. Results indicated that lead contents in four species including Belaya filosa, Sulcospira proteu, Pomacea canaliculata, and Pila conquered exploited in Huong river for use as food exceeded the permitted level issued by The Ministry of Health (QCVN 8­2 : 2011/BYT). The human health risk assessment for lead exposure showed high potential risks to consumers. The risk quotation (RQs) is higher than one suggested that it is unsafe to consume these snails.
Condition of food safety and some relevant factors of street food stores in Quoc Oai district, Hanoi in 2017
Authors: Luu Quoc Toan , Nguyen Thanh Tam , Nguyen Thi Minh Loi , Le Thi Hong Hao ,   Hanoi University of Public Health,   Quoc Oai Health Center, Hanoi,   Quang Binh University,   National Institute for Food Control
Published: January 2021

Street food trading helps to meet respond to the needs and satisfy the tastes of consumers. However, they also carry potential health risks, especially foodborne diseases. The cross-sectional study was conducted on 119 street food vendors in Quoc Oai District, Hanoi, Vietnam from February to May 2017. The study aimed to describe the food safety conditions of the street food vendors in Quoc Oai district in 2017 and identified the relevant factors. The study results showed that only 14.3% of the street food sample sold in Quoc Oai district met food safety requirements. Educational, cooking training, and seniority of the vendors, trading locations, the inspection of management agencies are factors which can have influences on the food safety conditions of street food vendors.
Studies on the method for determination of some polysaccharide food additives by fourier transform infrared spectrum (FTIR)
Authors: Luu Thi Huyen Trang , Le Thi Thuy , Tran Hoang Giang , Vu Thi Trang , Nguyen Thi Minh Loi , Phung Vu Phong ,   National Institute for Food Control,   National Institute for Food Control,   National Institute for Food Control,   National Institute for Food Control,   Quang Binh University,   Institute for Technology of Radioactive and Rare Elements
Published: January 2021

In this study, the simultaneous quantitative analysis of samples using multivarite linear regression based on near infrared spectrum has been developed. The model of partial least squares (PLS) matrix with seven value vectors is built with a standard matrix of samples (24 samples containing four analytes together with a total number of excipients) are applied for individual and/or simultaneous determination of guar gum, CMC, carrageenan, xanthan gum in real samples. A matrix of test samples including 10 samples created by fouranalytes to assess the accuracy of the PLS model. The results indicated that the relative error varied from 1.1 to 15%. The optimum experimental conditions were: spectral region: 1700 - 900 cm-1; volume ratio of sample/KBr: 2/98 (w/w); weight per capsule was 15 mg. The method was applied to identify four analytes in 15 material samples and food additive mixture samples.
Simultaneous analysis of metals in various types of medicinl herbs commonly used to produce functional foods by ICP-MS
Authors: Dinh Viet Chien , Le Van Ha , Pham Cong Hieu , Nguyen Minh Chau , Lu Thi Minh Hien , Tran Ngoc Tu , Pham Thu Giang , Le Van Tang , Phung Vu Phong ,   National Institute for Food Control,   National Institute for Food Control,   National Institute for Food Control,   National Institute for Food Control,   National Institute for Food Control,   Department of Food Hygiene and Safety Ha Noi,   National Instriture for food control,   National Institute for Food Control,   Institute for Technology of Radioactive and Rare Elements
Published: January 2021

ICP-MS method was optimized for the simultaneous analysis of 16 metals (Pb, Cd, As, Hg, Sn, Sb, Co, Ni, Cr, Mn, Mo, Se, Cu, Fe, Zn , Al) in types of medicinal herbs commonly used to produce functional foods. The conditions of samples digestion in a closed system using a microwave and an opened system in Kjeldahl method have been studied in order to flexibly apply different methods of sample preparation in practice. The method was validated with parameters such as calibration curve, limit of detection, limit of quantitation, repeatability RSDr % (0.98 - 19.7%), reproducibility RSDR% (2.72 - 23.5%) and recovery R% (80.3 -109%) meeting the AOAC performance requirements. The method was applied to determine heavy metals in 40 samples of medicinal herbs of apart from the risk of pollution with some toxic heavy metals such as lead and cadmium in medicinal herbs.
Hidden Violence: How COVID-19 School Closures Reduced the Reporting of Child Maltreatment
Authors: Cabrera-Hernández Francisco , Padilla-Romo María
Published: January 2021

This study examines how school closures during the COVID-19 pandemic affected the reporting of child maltreatment in Mexico City. We use a rich panel dataset on incident-level crime reports and victim characteristics and exploit the differential effects between school-age children and older individuals. While financial and mental distress due to the COVID-19 pandemic may result in additional cases of child maltreatment, synthetic control and difference-in-differences estimations document an average reduction in child maltreatment reports of 29% and 30%, respectively, with larger reductions among females and in higher-poverty municipalities. These results highlight the important role education professionals in school settings play in the early detection and reporting of domestic violence against school-age children.
STUDY OF EFFECT OF SOLID CONTAMINANTS IN THE LUBRICANT ON BALL BEARINGS VIBRATION
Authors: MAHAJAN ONKAR L. , UTPAT ABHAY A.
Published: January 2021

In deep groove ball bearings contamination of lubricant grease by solid particles is one of the main reason for early bearing failure. To deal with such problem, it is fundamental not only the use of reliable techniques concerning detection of solid contamination but also the investigation of the effects of certain contaminant characteristics on bearing performance. Nowadays the techniques such as vibration measurements are being increasingly used for on-time monitoring of machinery performance. The present work investigates the effect of lubricant contamination by solid particles on the dynamic behavior of rolling bearings, in order to determine the trends in the amounts of vibration affected by contamination in the Grease and by the bearing wear itself. Experimental tests are performed with Deep-groove ball bearings. The Dolomite powder in three concentration levels and different particle sizes was used to contaminate the grease. Vibration signals were analyzed in terms of Root Mean Square (RMS) values and also in terms of defect frequencies.
Handwritten Kannada Vowels and English Character Recognition System
Authors: Dhandra B.V. , Mukarambi Gururaj , Hangarge Mallikarjun
Published: January 2021

In this paper, a zone based features are extracted from handwritten Kannada Vowels and English uppercase Character images for their recognition. A Total of 4,000 handwritten Kannada and English sample images are collected for classifications. The collected images are normalized into 32 x 32 dimensions. Then the normalized images are divided into 64 zones and their pixel densities are calculated, generating a total of 64 features. These 64 features are submitted to KNN and SVM classifiers with 2 fold cross validation for recognition of the said characters. The proposed algorithm works for individual Kannada vowels, English uppercase alphabets and mixture of both the characters. The recognition accuracy of 92.71% for KNN and 96.00% for SVM classifiers are achieved in case of handwritten Kannada vowels and 97.51% for KNN and 98.26% for SVM classifiers are obtained in case of handwritten English uppercase alphabets. Further, the recognition accuracy of 95.77% and 97.03% is obtained for mixed characters (i.e. Kannada Vowels and English uppercase alphabets). Hence, the proposed algorithm is efficient for the said characters recognition. The proposed algorithm is independent of thinning and slant of the characters and is the novelty of the proposed work.
The Role of Marketing Resources and Marketing Dynamic Capabilities in
Improving Business Performance of Insurance Firms in Iran
Authors: Nouri Bagher Asgarnezhad , Ghaffar Mohammad , Pahlavanloo Mohammad Jafar Ram , Danesh Mehdi
Published: January 2021

Purpose - This study aims to investigate the effect of marketing resources and marketing dynamic capabilities on the business performance of insurance companies.
Design/methodology/approach - The population consists of all employees of the insurance firms in Ardabil and among them a sample of 177 people was selected using non-random convenience method. A standard questionnaire was used to measure variables. The hypotheses were analyzed using structural equation modeling method with use of SmartPLS software.
Findings - The results show that marketing resources have a positive impact on marketing dynamic capabilities. Also, marketing dynamic capabilities have a positive impact on customer performance and market performance. Finally, the positive impact of market performance and customer performance on financial performance was also confirmed.
Originality/value - There is lack of research explaining the role of marketing resources and marketing dynamic capabilities in improving business performance in service industries, especially in important insurance industry. This study attempts to reduce this gap in the literature, as its main goal is to assess the impact of marketing dynamic capabilities in improving business performance of insurance firms.
Work From Home: Experiences and Future Challenges - Indian Perspectives
from Pandemic Coronavirus and Consequent Lockdown
Authors: Makwana Kirti , Dave Govind B
Published: January 2021

Purpose- The Pandemic Coronavirus and consequent lockdown outbreak has called for
"the largest Work - From - Home (WFH) experiment worldwide". Receiving huge numbers of personnel to Work-From-Home has not ever been crucial. WFH is recommended and
implemented by approximately half (46%) of organizations because of the COVID-19 .
Design - This research paper did an in-depth study of WFH policies and explored experiences and challenges faced by employees. 260 executives working in 37 industries/sectors were approached through an online structured questionnaire.
Findings -Service Industries such as IT, Analytics, KPO, and Market Research are ready to implement Work from home.
Research limitations - The research study is limited to selected cities of Gujarat and
Maharashtra states of India. The survey can be extended to other cities / states / countries. Practical implications - COVID - 19 has changed the experiences of being an employee or an HR. The results generated from the research, can be useful to provide inputs to the organizations, HR managers and strategic thinkers to take decisions about implementation, continuation and challenges of WFH arrangements as a long-term HR strategy in the coming future (in selected sectors/industries).
Social implications - Coronavirus, prompted major changes in life as Work from home
(WFH) became the new normal. Employees embraced new routines and rules. The world saw its influence on all facets of life and has changed the way people work.
Originality- The distinctiveness of this article is that it provides evidences on how Indian
workforce shifted to remote work in the months after the pandemic outbreak.
Study the Role of Tp53 in the Development of Hepatocellular Carcinoma in HCV Infected Patients
Authors: F. Fahmy Nahed , S. Ahmed Nagwa , Galal Ghada , A. Abdel Elmoaty Mohamed , Abudeif Ahmed , M. Kadry Zeinab , A. Mohamed Nesma
Published: January 2021

Background: Hepatocellular carcinoma (HCC) is considered as the primary malignancy of the liver that usually occurs on top of chronic viral hepatitis. The TP53 (tumor protein 53) is a tumor suppressor gene which is the key in tumor development and progression and the single nucleotide polymorphism (SNP) of the p53 gene codon 72 (p53Arg/Pro) changes the structure of the protein. Objectives: to determine the association of the TP53 Arg72Pro polymorphism with the risk of HCC development in Hepatitis C virus (HCV) infected Egyptian patients. Methodology: This is a case control study conducted in Sohag University Hospital on 100 participants (20 HCC, 20 CHCV, 40 LC and 20 control). TP53 gene polymorphism was identified by Polymerase chain reaction-Restriction fragment length polymorphism (PCR-RFLP), serum level of TP53 was measured by quantitative ELISA. Results: The GG genotype / G allele has the highest frequency in the controls, while the CC genotype/ C allele was more frequently found in the HCC patients. Carriage of TP53 CC genotype and TP53 serum level have a statistical significant association with HCC development. Conclusion: the CC genotype and the Pro (C) allele of TP53, codon 72 are risk factors for HCC in patients infected with HCV and the serum TP53 level is overexpressed in HCC patients.
Índices del Mercurio Peruano 1790-1795
Authors: Clément Jean- Pierre
Published: January 2021

La edición facsimilar de la colección completa del MERCURIO PERUANO constituye obra meritoria que emprendió y dio término mi antecesor en el cargo de Director de la Biblioteca Nacional, el Dr. Carlos Cueto Fernandini. Empero la relativa brevedad de su paso por dicho cargo, no permitió que Cueto se abocarara a dirigir la confección de los Indices generales de La memorable revista, en cuya reproducción había puesto tanto empeño, con juntamente con el personal técnico más calificado de dicha institución. Sin embargo, la edición facsimilar constituyó un verdadero acontecimiento intelectrial, al menos en el Perú, como lo hicimos notar en artículos y estudios que, en la debida oportunidad, publicamos varios escritores en diversos periódicos y revistas del ámbito hispanoamericano.
Modelling the Brumadinho tailings dam failure, the subsequent loss of life and how it could have been reduced
Authors: Lumbroso Darren , Davison Mark , Body Richard , Petkovšek Gregor
Published: January 2021

Abstract. In recent years the number of tailings dams failures has increased. On 25 January 2019, the Brumadinho tailings dam in Brazil suddenly failed, releasing a mudflow over 10 m deep comprising some 107 m3
of mining waste which killed between 270 and 320 people. This paper details the use of an agent-based model, known as the Life Safety Model (LSM), to estimate the risk to people downstream of the Brumadinho tailings dam and to assess if the number of fatalities could have been reduced if a warning had been received prior to or at time the dam failed. The LSM modelling indicates that even if a warning had been issued as the dam failed, the number of fatalities could have been reduced. Agent-based modelling tools such as the LSM can help to inform and improve emergency plans for tailings dams, which will help to reduce the risks posed by them in the future.
Use of a search summary table to improve systematic review search methods, results, and efficiency
Authors: Bethel Alison C. , Rogers Morwenna , Abbott Rebecca
Published: January 2021

Background: Systematic reviews are comprehensive, robust, inclusive, transparent, and reproducible when bringing together the evidence to answer a research question. Various guidelines provide recommendations on the expertise required to conduct a systematic review, where and how to search for literature, and what should be reported in the published review. However, the finer details of the search results are not typically reported to allow the search methods or search efficiency to be evaluated.Case Presentation: This case study presents a search summary table, containing the details of which databases were searched, which supplementary search methods were used, and where the included articles were found. It was developed and published alongside a recent systematic review. This simple format can be used in future systematic reviews to improve search results reporting.Conclusions: Publishing a search summary table in all systematic reviews would add to the growing evidence base about information retrieval, which would help in determining which databases to search for which type of review (in terms of either topic or scope), what supplementary search methods are most effective, what type of literature is being included, and where it is found. It would also provide evidence for future searching and search methods research.
Search methods for prognostic factor systematic reviews: a methodologic investigation
Authors: Boulos Leah , Ogilvie Rachel , Hayden Jill A.
Published: January 2021

Objective: This study retroactively investigated the search methods used in the 2019 Hayden et al. study, one of the first systematic reviews of prognostic factors that was published in the Cochrane Library. The review was designed to address recognized weaknesses in reviews of prognosis by using multiple supplementary search methods in addition to traditional electronic database searching.Methods: The authors used four approaches to comprehensively assess aspects of systematic review literature searching for prognostic factor studies: (1) comparison of search recall of broad versus focused electronic search strategies, (2) linking of search methods of origin for eligible studies, (3) analysis of impact of supplementary search methods on meta-analysis conclusions, and (4) analysis of prognosis filter performance.Results: The review’s focused electronic search strategy resulted in a 91% reduction in recall, compared to a broader version. Had the team relied on the focused search strategy without using supplementary search methods, they would have missed 23 of 58 eligible studies that were indexed in MEDLINE; additionally, the number of included studies in 2 of the review’s primary outcome meta-analyses would have changed. Using a broader strategy without supplementary searches would still have missed 5 studies. The prognosis filter used in the review demonstrated the highest sensitivity of any of the filters tested.Conclusions: Our study results support recommendations for supplementary search methods made by prominent systematic review methodologists. Leaving out any supplemental search methods would have resulted in missed studies, and these omissions would not have been prevented by using a broader search strategy or any of the other prognosis filters tested.
An integrated land-use/transportation forecasting and planning model: A metropolitan planning support system
Authors: Anjomani Ardeshir
Published: January 2021

Over the last several decades, land-use/transport interaction models have evolved. Although these models have the potential to become primary demographic forecasting and planning vehicles in metropolitan transportation planning for most large US urban regions, some gaps and improvements must be addressed. 
This paper briefly discusses a newly developed and refined integrated land-use/transportation model. It also introduces innovative approaches to modeling an urban area including a variant of a geographic information system-based land-use and environmental suitability analysis, as main components in deriving development potential for a small-cell grid of the study region. This approach enables the inclusion of public and stakeholder input into the modeling process, facilitates micro-level consideration of trip generation, trip distribution, and mode-choice inside the land-use demographic model, thus furthering the integration of transportation and land use in the modeling process. Such considerations and utilization of rule-based approaches and concerns of economic development and environmental and sustainability factors help close some existing gaps of operational models designed for real world practical applications. All of these features contribute toward further improvement of these models.
La epigrafía romana de Acinippo (Ronda la Vieja, Málaga): documentación gráfica de Antonio Madrid Muñoz
Authors: Hernando Sobrino María del Rosario
Published: January 2021

Analizamos en este trabajo unos documentos gráficos relativos a diversas inscripciones de Acinippo (Ronda la Vieja, Málaga) conservados en la Real Academia de la Historia (Madrid). Estos documentos (dos láminas de dibujos y una fotografía) formaban parte del material que complementaba la “Memoria” que, sobre dicho lugar, escribió el cronista rondeño Antonio Madrid Muñoz; sin embargo, no llegaron a incluirse en la publicación de la misma, que vio la luz en 1913, privando a la comunidad científica de unos datos de gran interés para la correcta valoración de los epígrafes en ella registrados
Dos inscripciones tardoantiguas donadas al Museo Arqueológico Nacional (Madrid)
Authors: Santiago Fernández Javier
Published: January 2021

El presente artículo estudia dos inscripciones del Museo Arqueológico Nacional. Se analizan tanto las propias inscripciones como la documentación sobre ellas existente en el archivo del Museo. En ambas se ofrece un estudio integral, tanto de los elementos externos como internos, analizando la escritura y los formulismos en ellas utilizados. Una de ellas había sido publicada previamente; aquí se ofrece una propuesta razonada de datación y se ofrecen todos los datos conocidos sobre su hallazgo y entrada en el Museo. La otra es un fragmento inédito.
Currículo y Democracia
Authors: Sacristán José Gimeno
Published: January 2021

Fragmentos de la conferencia dictada por el académico de la Universidad de Valencia, España, en la Casa Central de la

Universidad de Chile, con motivo de la Primera Jornada de Curriculum y Comunidad Educativa, efectuada en 1994.

Trasliteración: M. Angélica San Martín Espinoza.
Estudiantes, profesores y madres
Authors: Sánchez Segura Ximena , Fernández Mateo Francisco , Villarroel Rosende Gladys
Published: January 2021

El análisis de datos sobre exposición a la televisión y evaluación de los programas televisados provenientes de encuestas realizadas a muestras aleatorias de estudiantes de educación básica, sus madres y sus profesores(as) en las zonas urbanas de Valparaíso y Viña del Mar, Chile, indican que los profesores(as) exhiben el grado más bajo de exposición. En relación con la evaluación de los programas, los estudiantes realizan una evaluación más positiva que sus madres y

profesores(as), señalando que aprenden valores positivos e importante material para su educación, diferente de la que aprenden en la escuela. Los profesores(as) expresan la evaluación más negativa de los contenidos de la televisión aprendidos por los estudiantes, enfatizando la violencia y consumismo de dichos contenidos. Asimismo, consideran que la exposición de los estudiantes a la televisión dificulta sus tareas como docentes. En relación con la forma en que los niños y niñas reciben los mensajes de la televisión, se rechaza la recepción pasiva. Se discute que la evaluación negativa de la televisión que manifiestan los profesores(as) y su desconocimiento del uso que los estudiantes hacen de ella, en el actual contexto de alta exposición infantil a la televisión, dificulta el uso de la televisión como una adecuada herramienta educacional.
Ciencia antigua, moderna y contemporánea
Authors: Ramírez Cádiz Julio
Published: January 2021

Se presenta una sinopsis del desarrollo de la ciencia a través del tiempo, destacando sus características.
Los discursos de las alumnas acerca de la escuela
Authors: Villarroel Rosende Gladys , Urenda Salamanca Macarena
Published: January 2021

Este estudio cualitativo da cuenta de los discursos acerca de la escuela que sostienen las alumnas de enseñanza media de los colegios particulares subvencionados y particulares pagados de niñas de Valparaíso y Viña del Mar.

El objetivo del estudio fue detectar las categorías de análisis presentes en los discursos de las alumnas sobre la escuela con el fin de reconstruir la visión que ellas tienen sobre la calidad del colegio al que asisten. Además, interesó determinar

el grado de homogeneidad o heterogeneidad de estos discursos según el tipo de dependencia administrativa del colegio al que pertenecían las alumnas.

Los datos fueron recabados a través de entrevistas en profundidad aplicadas a 40 alumnas de tercer año de enseñanza media de los colegios mencionados.

Entre los hallazgos más relevantes cabe destacar que en los discursos de las alumnas de ambos tipos de colegios, se manifiesta una visión ideal de la escuela que es coincidente con la función manifiesta de educar que la sociedad

tradicionalmente le ha atribuido; y una visión real de la escuela que corresponde a la percepción que las alumnas tienen de su escuela real y concreta.

En los discursos de la escuela como una realidad cotidiana se evidencia diferencias en las percepciones que las alumnas de estos distintos tipos de colegios tienen sobre la escuela, siendo las categorías para enjuiciar la escuela usadas por las alumnas de los colegios particulares pagados, más numerosas y más complejas; reflejándose en ellas mayores expectativas y exigencias acerca de cómo la escuela debe proceder para lograr los objetivos presentes en el discurso oficial sobre la función de la escuela.
El Discurso de los adolescentes escolares chilenos
Authors: Romeo Cardone Julia , Llaña Mena Mónica , Fernández Mateo Francisco
Published: January 2021

Este trabajo pretende contribuir con una documentación, generada desde el discurso de los jóvenes, con inclusión de una interpretación y un análisis, a modo de una opción de lectura, con propósitos de aproximarse a la cosmovisión que ellos declaran acerca de la participación, y, en consecuencia, a un sistema configurante de actitudes deseables de portar.

Se conformaron grupos de discusión, constituidos por alumnos y alumnas de establecimientos de distinta adscripción administrativa y de identificación diferente. desde el punto de vista socio-económico. Estas últimas consideraciones se han estimado desde la perspectiva de una adaptación de los criterios de J.J. Macionis (1994), contemplando -así- niveles alto y medio-alto, medio-medio, y medio-bajo y bajo. Se ha respetado-también- la dimensión de homologación y de heterogeneidad que son necesarios en este tipo de procedimientos.
MODELING AND SIMULATION OF A HORIZONTAL THREE-PHASE SEPARATOR: INFLUENCE OF PHYSICOCHEMICAL PROPERTIES OF OIL
Authors: Carvalho A. J. G. , Galindo D. C. , Tenório M. S. C. , Marinho J. L. G.
Published: January 2021

Fluids produced from oil reservoirs typically contain oil, natural gas, water, sediments, in varying amounts, and contaminating gases. Considering that economic interest usually targets mostly oil and gas, primary processing is used to separate water/oil/gas, in addition to treating these phases. Therefore, the well stream should be processed as soon as possible after reaching the surface. Separator vessels are among the main equipment used at surface production facilities, being responsible for the separation of the produced phases. This work focuses on studying the fluid dynamic behavior in a horizontal three-phase separator. To accomplish this goal, we used the computer fluid dynamics software ANSYS CFX. First, we performed a detailed analysis of a “Standard Case” to understand in detail the entire separation process within the vessel. The results show the three phases through the simulation time, analyses of the separation efficiency, different fluids flow lines, pressure gradient inside the vessel, and effect of the diverter baffle. It also considers a variation of fluid flow at the inlet of the separator. These analyses include pictures of all cases studied. Afterwards, some parameters of the standard case were altered to evaluate its influence on fluid dynamics behavior and the functioning of the separator vessel. At last, we analyzed the influences of oil density and viscosity on the separation. The oil quality affects the primary separation directly, as the oil density and viscosity increase, for example, increases the drag between the fluids and decreases the rate of sedimentation, which stickles the separation process difficult. Two out of the three cases generated satisfactory results. The simulation with the heaviest oil presented the worse results.
WOMEN IN THE WEB OF TERRORISM IN CAMEROON’S FAR NORTH REGION, STAKES AND IMPLICATIONS
Authors: Muntoh Eugene Muambeh
Published: January 2021

Terrorism has been a major source of disruptions and affliction on women in Cameroon’s far north region in recent times. This have greatly affected women from every facet. This paper examines the stakes and implications of terrorism on the welfare of women in Cameroon’s far north region. The study adopted a historical analytical style approach based on a rigorous analysis of data collected. Data for the study was collected from both primary and secondary sources. Based on its findings, the paper sustains the argument that terrorism remain a major threat to women in Cameroon’s far north region. Reforms in counter-terrorism policies are important to improve efficiency and ensure a better living condition for women in the midst of terrorism.
As diplomatas bissau-guineenses por elas mesmas: obstáculos ao ingresso e à permanência na carreira diplomática
Authors: Sanca Naentrem , Lenine Enzo
Published: January 2021

Quais os obstáculos vivenciados pelas mulheres bissau-guineenses para o ingresso e a permanência na carreira diplomática na República de Guiné-Bissau? A presença feminina nos quadros diplomáticos de diversos países do mundo ainda se encontra aquém da paridade, havendo predominância de homens ocupando cargos de embaixadores, cônsules e secretários. Neste artigo, analisamos os obstáculos enfrentados pelas mulheres de Guiné-Bissau em dois momentos: antes e depois do ingresso na carreira. Realizamos entrevistas com diplomatas bissau-guineenses, visando a evidenciar os referidos obstáculos, salientando os desafios vivenciados não só por suas trajetórias pessoais, mas também pelas mulheres de Guiné-Bissau no que tange ao acesso a este espaço político-burocrático.
Foreign investor's rights, investment promotion and facilitation agencies: a developmental and sustainable vision
Authors: Stanley Leonardo E.
Published: January 2021

Fifty years ago, the role of foreign investors was at the center of the political debate, with host state - investors disputes showing a geographical North-Southth pattern. The end of the ISI model would signal a new era, including a new relationship with foreign investors. As part of their efforts, developing and emerging countries (DECs) liberalize foreign direct investment (FDI) national policies and to provide fiscal and other incentives to foreign investors. FDI flows were seen as always beneficial: a quantitative approach. Sooner than later, however, policy-makers became aware of the scheme’s pro-investment bias. FDI quality, not quantity, became the new ideal. Latin American countries’ position in the issue, however, remains quantitative objectives still dominate the investment debate. Indeed, a movement towards sustainability would come to question the natural-resource led growth model followed by the region. So, the debate around the treatment of foreign investors remains open.
Sozialdatenschutz in der Kinder- und Jugendhilfe
Authors: Kepert Jan
Published: January 2021

Der spezifische Sozialdatenschutz in der Kinder- und Jugendhilfe erleichtert die tägliche Arbeit, indem mit besonderen Regelungen (insbesondere § 64 Abs. 2 sowie § 65 SGB VIII) eine besondere Vertrauensbeziehung zu Eltern, Kind und sonstigen Beteiligten ermöglicht wird. Allerdings führt dieser besondere Datenschutz auch zu Restriktionen in der täglichen Arbeit und führt auch bei Dritten gelegentlich zu Unverständnis.

Eine rechtssichere und wirksame Aufgabenerfüllung nach dem SGB VIII setzt daher spezifische Kenntnisse des Datenschutzes in der Kinder- und Jugendhilfe voraus. Mit dem Handbuch erfolgt eine systematische Darstellung des Sozialdatenschutzes und der Anforderungen, welche bei Datenerhebung, Datenspeicherung, Datenübermittlung sowie der Datennutzung zu beachten sind. Insbesondere wird der Datenschutz hinsichtlich besonderer Arbeitsbereiche (Kinderschutz, Beratung, Hilfeplanung etc.) intensiv beleuchtet.