bluuebunny/crossref_metadata_2025 huggingface dataset:
Ligand symmetry significantly affects spin crossover behaviour in isomeric [Fe(pybox)2]2+ complexes
Authors: Wang Run-Guo , Meng Yin-Shan , Gao Fang-Fang , Gao Wan-Qing , Liu Chun-Hua , Li Anyang , Liu Tao , Zhu Yuan-Yuan
Published: February 2021

We demonstrate that ligand symmetry imposes strong influence on spin crossover behaviour in three [Fe(pybox)2]2+ isomers bearing phenyl substituents.
Complexation of triangular silver(i) or copper(i) nitropyrazolates with dibenzothiophenes having potential use in adsorptive desulfurization
Authors: Yang Lin , Wang Lihong , Lv Xingpu , Chen Jing-Huo , Wang Yang , Yang Guang
Published: February 2021

Triangular copper(i) nitropyrazolate outperforms its silver(i) analog in the adsorptive removal of dibenzothiophenes from oil and the adsorbed samples can be recycled easily by ether-washing.
A benzene-bridged divanadium complex-early transition metal catalyst for alkene alkylarylation with PhI(O2CR)2via decarboxylation
Authors: Zhang Lei , Zhou Hongfei , Bai Shaokun , Li Shaodan
Published: February 2021

A novel benzene-bridged inverted-sandwich divanadium complex was synthesized and used to catalyze alkene alkylarylation with HIRs via decarboxylation.
Efficient proton conductivity of a novel 3D open-framework vanadoborate with [V6B20] architectures
Authors: Zhang Le , Liu Xinxin , Shang Mingyu , Sun Fuxing , Jian Juan , Bu Ke , Zeng Decheng , Yuan Hongming
Published: February 2021

A novel 3D open-framework vanadoborate exhibits a remarkable proton conductivity of 3.22 × 10−3 S cm−1.
Absorption and transport of aMytilus edulis-derived peptide with the function of preventing osteoporosis
Authors: Xu Zhe , Fan Fengjiao , Chen Hui , Shi Pujie , Zhu Dongyang , Yang Meilian , Wang Zhenyu , EI-Seedi Hesham R. , Du Ming
Published: February 2021

The YPRKDETGAERT peptide (PME-1) identified from the Mytilus edulis proteins has been shown to promote the proliferation and differentiation of osteoblasts and it has good bone-forming activity in vitro and PME-1 was easily absorbed in the gastrointestinal tract.
Preparation and characterization of sodium-ion conductive Na3BS3 glass and glass–ceramic electrolytes
Authors: Tsuji Fumika , Nasu Akira , Hotehama Chie , Sakuda Atsushi , Tatsumisago Masahiro , Hayashi Akitoshi
Published: February 2021

Glass has the highest conductivity and appropriate properties in the Na3BS3 electrolytes for all-solid-state batteries.
Progress and challenges in self-healing composite materials
Authors: Islam Shafiqul , Bhat Gajanan
Published: February 2021

Self-healing methods.
Intensifying sustainable solar water production by steam heat internal circulation
Authors: Guo Zhenzhen , Xu You , Chen Zihe , Yu Fang , Yin Jiacheng , Mei Tao , Wang Xianbao
Published: February 2021

A strategy of steam heat internal circulation was designed for enhancing the efficiency of sustainable water production during solar evaporation.
Design of charge transfer channels: defective TiO2/MoP supported on carbon cloth for solar-light-driven hydrogen generation
Authors: Tian Qianqian , Yi Shasha , Li Chuanqi , Liu Yan , Niu Zhulin , Yue Xinzheng , Liu Zhongyi
Published: February 2021

We successfully integrated MoP and TiO2 on flexible carbon cloth (CC) to construct a panel photoreactor with efficient charge transfer channels, where CC acts as an electron collector and guides directional migration of electrons (TiO2 → MoP → CC).
Recent advances in quinazolinones as an emerging molecular platform for luminescent materials and bioimaging
Authors: Xing Zhiming , Wu Wanhui , Miao Yongxiang , Tang Yingqun , Zhou Youkang , Zheng Lifang , Fu Yang , Song Zhibin , Peng Yiyuan
Published: February 2021

This review summarized recent advances relating to the luminescence properties of quinazolinones and their applications in fluorescent probes, biological imaging and luminescent materials. Their future outlook is also included.
Engineering defect clusters in distorted NaMgF3 perovskite and their important roles in tuning the emission characteristics of Eu3+ dopant ion
Authors: Mukherjee Sumanta , Pathak Nimai , Das Debarati , Dutta Dhanadeep
Published: February 2021

Defect engineering in distorted NaMgF3 can be achieved by doping different amounts of dopant (Eu3+) and co-dopant (Li+) ions, which has a significant impact on the emission spectrum and photoluminescence decay profile of the Eu3+ ion.
A new type of noncovalent surface–π stacking interaction occurring on peroxide-modified titania nanosheets driven by vertical π-state polarization
Authors: Ma Shenqian , Zhao Weixin , Zhou Jun , Wang Jiaou , Chu Shengqi , Liu Zigeng , Xiang Guolei
Published: February 2021

A new type of noncovalent surface–π stacking interaction occurring on a transition metal oxide, titania, is reported, which is different from the traditional forms on sp2-hybridized planar structures like graphene.
Translational dynamics of a non-degenerate molecular shuttle imbedded in a zirconium metal–organic framework
Authors: Wilson Benjamin H. , Abdulla Louae M. , Schurko Robert W. , Loeb Stephen J.
Published: February 2021

An unsymmetrical molecular shuttle was incorporated into the octahedral cavities of a Zr(iv) MOF. 13C SSNMR showed that the presence of mesitylene in the pores results in an increase in the barriers for the thermally driven motion of the macrocycle.
Decorating Pt@cyclodextrin nanoclusters on C3N4/MXene for boosting the photocatalytic H2O2 production
Authors: Zhu Haiguang , Xue Qiang , Zhu Guangyan , Liu Yong , Dou Xinyue , Yuan Xun
Published: February 2021

A high-performance photocatalyst is developed for photocatalytic H2O2 production based on decorating per-6-thio-β-cyclodextrin (SH-β-CD)-protected Pt nanoclusters on C3N4/MXene heterojunctions.
Ultralong cycling and wide temperature range of lithium metal batteries enabled by solid polymer electrolytes interpenetrated with a poly(liquid crystal) network
Authors: Yao Meng , Zhang Haitao , Dong Kun , Li Bosen , Xing Chunxian , Dang Manyu , Zhang Suojiang
Published: February 2021

With the in situ polymerization of liquid crystal (LC), more free lithium ions are released, which enhances the performance of P-PLC-IL.
Exfoliated covalent organic framework nanosheets
Authors: Tao You , Ji Wenyan , Ding Xuesong , Han Bao-Hang
Published: February 2021

This review outlines strategies for the preparation of exfoliated nanosheets and the application examples of these synthesized exfoliated nanosheets in various frontier fields.
High-precision detection of ordinary sound by electrospun polyacrylonitrile nanofibers
Authors: Peng Lu , Jin Xin , Niu Jiarong , Wang Wenyu , Wang Hongxia , Shao Hao , Lang Chenhong , Lin Tong
Published: February 2021

Electrospun polyacrylonitrile membranes can be used to detect middle-intensity sound with high accuracy, sensitivity, and fidelity with overall performance higher than that of electrospun poly(vinylidene fluoride) in the same condition.
Recent advances in 2D black phosphorus based materials for gas sensing applications
Authors: Aaryashree  , Shinde Pratik V. , Kumar Amitesh , Late Dattatray J. , Rout Chandra Sekhar
Published: February 2021

Black phosphorous (BP) has emerged as a potential sensing material due to its exceptional physicochemical properties. The review presents both the theoretical and experimental aspects of the BP-based gas sensors.
Room-temperature white and color-tunable afterglow by manipulating multi-mode triplet emissions
Authors: Liu Jianwei , Ma Zhimin , Li Zewei , Liu Yan , Fu Xiaohua , Jiang Hong , Ma Zhiyong , Jia Xinru
Published: February 2021

Two isomers pDCzPyCN and oDCzPyCN are designed and synthesized. Amazingly, oDCzPyCN manifest white afterglow at room temperature. This is the first time that single-component white afterglow has finally been realized.
Implications of acceptor doping in the polarization and electrocaloric response of 0.9Pb(Mg1/3Nb2/3)O3–0.1PbTiO3 relaxor ferroelectric ceramics
Authors: Bradeško Andraž , Vrabelj Marko , Fulanović Lovro , Svirskas Šarūnas , Ivanov Maksim , Katiliūte Ringaile , Jablonskas Džiugas , Šimėnas Mantas , Usevičius Gediminas , Malič Barbara , Banys Juras , Rojac Tadej
Published: February 2021

Defect engineering by acceptor doping affects the dipolar state in relaxor ferroelectrics, resulting in a tailored electrocaloric response.
Determination of phenolic compounds in estuary water and sediment by solid-phase isotope dansylation coupled with liquid chromatography-high resolution mass spectrometry
Authors: Xu Wenxue , Hu Yufeng , Wu Minghuo , Miao Enming , Zhou Hao , Zhang Xuwang , Zhan Jingjing
Published: February 2021

A method consisting of solid-phase isotope dansylation (derivatization with dansyl chloride) and liquid chromatography-high resolution mass spectrometry was developed for the quantitative analysis of phenols in environmental samples.
Calcium catalyzed enantioselective intramolecular alkene hydroamination with chiral C2-symmetric bis-amide ligands
Authors: Stegner Philipp C. , Eyselein Jonathan , Ballmann Gerd M. , Langer Jens , Schmidt Jochen , Harder Sjoerd
Published: February 2021

Enantioselective catalysis with calcium catalysts is challenging due to facile loss of the chiral spectator ligand. Herein a series of bis-amide calcium catalysts with chiral binaphtalene bridges is introduced.
An isoxazole strategy for the synthesis of alkyl 5-amino-4-cyano-1H-pyrrole-2-carboxylates – versatile building blocks for assembling pyrrolo-fused heterocycles
Authors: Agafonova Anastasiya V. , Funt Liya D. , Novikov Mikhail S. , Khlebnikov Alexander F.
Published: February 2021

A full atom-economical domino method for the preparation of alkyl 5-amino-4-cyano-1H-pyrrole-2-carboxylates and their use in annulation reactions is reported.
Tuning the photoelectric response of pyrene-based coordination polymers by optimizing charge transfer
Authors: Xu Wenjuan , Sun Yupei , Meng Xiangru , Zhang Wenjing , Hou Hongwei
Published: February 2021

Three π–π stacked CPs were designed and synthesized for application of photoelectric response. The effect of charge transfer on the photoelectric properties is explored by adjusting the composition and π-stacking fashion of the CPs.
Retraction: PVT1 depletion protects cartilage ATDC5 cells against LPS-induced inflammatory injury by regulating the miR-24/ADAMTS5 axis
Authors: Fisher Laura
Published: February 2021

Retraction of ‘PVT1 depletion protects cartilage ATDC5 cells against LPS-induced inflammatory injury by regulating the miR-24/ADAMTS5 axis’ by Wenjun Li et al., RSC Adv., 2018, 8, 37518–37527, DOI: 10.1039/C8RA06547K.
Towards the rational design of ylide-substituted phosphines for gold(i)-catalysis: from inactive to ppm-level catalysis
Authors: Handelmann Jens , Babu Chatla Naga , Steinert Henning , Schwarz Christopher , Scherpf Thorsten , Kroll Alexander , Gessner Viktoria H.
Published: February 2021

Modification of the backbone in ylide-substituted phosphines allowed a remarkable boost in the catalytic activity, thus enabling a series of gold catalyzed transformations at very low catalyst loadings.
Integrating active C3N4 moieties in hydrogen-bonded organic frameworks for efficient photocatalysis
Authors: Li Tao , Liu Bai-Tong , Fang Zhi-Bin , Yin Qi , Wang Rui , Liu Tian-Fu
Published: February 2021

This study reports a photocatalyst based on a hydrogen-bonded organic framework exhibiting a high H2 evolution rate and easy recyclability. The ordered arrangement of photosensitizers is proved to play a vital role in the photocatalytic activity.
Tense Marking in the Kindergarten Population: Testing the Bimodal Distribution Hypothesis
Authors: Weiler Brian , Schuele C. Melanie
Published: February 2021

Purpose

The purpose of this study was to explore whether evidence for a bimodal distribution of tense marking, previously documented in clinically referred samples, exists in a population-based sample of kindergarten children from a rural county in Tennessee.

Method

A measure of tense marking, the Test of Early Grammatical Impairment (TEGI) Screening Test, was individually administered to consented kindergarten students (
N
= 153) across three elementary schools in a single school district. The consented children constituted 73% of kindergartners in the district. Cluster analysis was used to evaluate the number and composition of latent classes that best fit the distribution of the TEGI Screening Test scores.

Results

Analysis of the scores revealed a distribution that deviated significantly from normality. Cluster analyses (Ward's,
k
-means, single linkage) revealed a two-cluster solution as the best fitting model. The very large effect-size difference in mean TEGI Screening Test score between the two clusters (
d
= 4.77) provides validation of an identifiable boundary delineating typical from atypical tense marking in this sample of kindergartners. The difference in tense marking across the two clusters was not attributable to child chronological age. The percentage of the sample comprising the low-performing cluster aligns with specific language impairment and developmental language disorder prevalence estimates.

Conclusion

Additional demonstrations of a bimodal distribution of tense marking in future studies with carefully defined samples could strengthen the clinical marker evidence and utility of this linguistic feature.
Environmental education for youth and adults: a bibliometric analysis of research
Authors: Onopriienko Kateryna , Onopriienko Volodymyr , Petrushenko Yurii , Onopriienko Iryna
Published: February 2021

In recent years there has been a sharp increase in the interest of humanity to environment preservation. It has become clear that the reckless use of nature will sooner or later lead to a catastrophe that will have not only environmental, but also economic and social consequences. The article provides a bibliographic analysis of scientific papers from around the world on the basis of Scopus with the keywords "environmental education" and "environmental adult education" for the period 1968 - 2019. It was found that in this regard most attention is paid to the US authors. The scientific works of the authors, who are the leaders in terms of the number of publications on environmental education of adults, have been studied. With the help of Vosviewer software it was determined which countries publish the biggest and the smallest number of scientific papers with the keyword "environmental adult education". Scientific works of domestic scientists were also analyzed. Adult education is becoming important in addition to the classic concept of school education. The article analyzes, which fields of science have the biggest and the smallest number of scientific papers with the keyword "environmental adult education", where social and environmental sciences became the leaders.
Theoretical Analysis of a New Design of a Concentration Based Solar Distiller
Authors: Mohammed Mokhtar , Mourad Taha Janan
Published: February 2021

This paper includes a theoretical study of energy balance for all parts of new design of solar concentration distiller using a parabolic concentrator with a half-cylinder basin. Our goal is to analyze the thermal efficiency of the new device to use in the Morocco's Rabat-Sale-Kenitra region. The methodology concentrates on solving the thermal collector's energy balance equations whose components are the glass cover, the brackish water and half-cylinder absorber. Numerical resolution of the energy balance equations was performed using a MATLAB code based on the method of 4th order Runge-Kutta. The results show a good theoretical performance of the new device.
Green competitiveness: the evolution of concept formation
Authors: Chygryn Olena , Rosokhata Anna , Rybina Olena , Stoyanets Natalia
Published: February 2021

The modern tendencies confirmed the necessity to consider the environmental factors in companies' effectiveness. The goal of the article is to investigate the structural and functional environment of the development of the green competitiveness concept. In the paper were used the methods of bibliometric analysis for determining vectors of green competitiveness concept development. The hypothesis of the study is the growing tendency of analysing sustainable competitiveness by scientists. In this order, a bibliometric analysis of the spread of the concept of «green competitiveness» in scientific articles indexed by the Scopus database was performed. The authors reviewed about 30000 papers from Scopus base in the period from 1996 till 2019. The Scopus screening tools showed that in 2004 the number of articles that focused on green competitiveness began to increase. On the international level, the investigated area was represented by the next countries: the United States, China, India, Great Britain, Taiwan. Using the VOS viewer program were identified the main clusters of the scientific papers, which have investigated green competitiveness with the interconnection of such categories: green marketing, green innovation and sustainable development. The findings could be used for improving the basis for the creation of the strategies for green competitiveness promotion.
A study on the bacteriological characterization of the coastal Tangier seawater: Preliminary results
Authors: Bourouhou Imane , Salmoun Farida
Published: February 2021

This paper deals, on the one hand, with a study of bacteriological parameters of coastal water in the region of Tangier Ksar-Sghir, north of Morocco, and secondly, with an examination of the influence of temperature parameter on biological processes occurring within seawater. The bacteriological study concerns E. coli, fecal coliforms (F.C), total coliforms (T.C) and fecal streptococcus (F.S). A campaign of 25 sampling points spread over four layers of concentration was conducted in the coastal line during the year of 2017 and The overall results of tests were obtained using the Principal Component Analysis method. (PCA). The analysis has highlighted differentiated areas in term of sanitary quality. The highest values obtained were in the zone of Tangier-Med port showing high fecal contamination by pollution indicator bacteria (T.C, F.C, E. coli and F.S) with high temperature values that result in short-, medium- and long-term environmental pollution.
Lithological mapping using Landsat 8 Oli multispectral data in Boumalne, Imider, and Sidi Ali Oubork, High Central Atlas, Morocco
Authors: Abdelouhed Farah , Algouti Ahmed , Algouti Abdellah , Ait Mlouk Mohamed , Ifkirne Mohammed
Published: February 2021

The recognition of geological formations, from a lithological point of view, as well as their tectonic character always remain a major challenge for any precise geological study, in this work we will see the great importance of the application of remote sensing (Landsat OLI, DEM) to realize lithological maps of great interest as well as the realization of detailed lineament maps with the statistics of the performed measurements, the application of some indicated techniques showed a good discrimination of the lithology of geological formations (Fig.8 ,Fig.10,Fig.11),better results and interpretations are also obtained for lineaments affecting the whole area by using the CP1 and DEM methods (Fig.5,Fig.6).Topographic map and geological maps of JBEL SAGHRO DADES and TODGHA MADER (1/200000) gained from ministry of energy and mines, direction of geology (1975), are used for validation of the obtained results by eliminating of artificial structures (roads) and geological layer boundaries. All data sets were pre-processed and projected in the Universal Transverse Mercator (UTM Zone 29 North) projection system and the WGS84 datum using GIS tools (ArcGIS 10.2).
Evaluation of the physicochemical and bacteriological quality of the Loukkos wetlands complex (Morocco)
Authors: Fathi Badreddine , Salame Bouchra , Afilal Tribak Abdelghani , Wahbi Miriam , Maâtouk Mustapha
Published: February 2021

The estuary of the Loukkos River is a complex ecosystem where various factors affect the quality of water. Our study is assessing the degree of water pollution in the complex of the lower Loukkos wetland’s surface water, which is situated at the river mouth of the Loukkos river in the eastern periphery of Larache city. To realize this objective, we collected water samplings from five area sites during summer period from May to August 2016 to analyse eight parameters physicochemical including dissolved oxygen (DO), temperature, pH, electrical conductivity, turbidity, salinity, suspended matter and nitrates. This study was accompanied by a bacteriological analysis relating to the enumeration of total coliforms and faecal coliforms, intestinal enterococci and reducing anaerobic sulphites. The analysis’s results shed lights on factors of contamination and collaborate to the physicochemical evaluation and bacteriologic quality of surface water. The quality indicators spatialization reveals interactions between the various phenomena acting on the functions of this Ramsar site.
Cutaneous Leishmaniasis cases and risk factors in north central of Morocco, Sefrou province: An impact study
Authors: Talbi Fatima Zahra , Najy Mohamed , Nouayti Nordine , En-nkhili Hicham , El Ouali Lalami Abdelhakim
Published: February 2021

In order to set up a program for fighting against leishmaniasis disease, it was considered useful beforehand to demonstrate Leishmanian risk factors to the CL disease cases. The Province of Sefrou is among the endemic areas. Surveillance of these outbreaks is essential. This work focused on studying the impact risk factors on the distribution of CL cases. This is a retrospective study of CL cases registered during five years (2007-2010). Statistical analysis was based on one-way analysis of variance (ANOVA) and then the correlation study was carried out (Pearson correlation). A significant linear association was found between the number of CL cases and the population(r=0.56; p=0.005). This means that the correlation is positive. For the urbanization factor, the association was marked moderately correlated with number of CL cases (r = 0.44; p = 0.037).However, poverty does not influence this distribution; for our study area, this factor is not a risk factor.
Smart environmental data management system into a cattle building
Authors: Majdoubi Anass , El Abderrahmani Abdellatif , Lasri Rafik
Published: February 2021

The climatic atmosphere in which cattle live is an essential parameter of their environment because of its critical role in their productivity. An adapted cattle building must help to mitigate the effects of climatic stress and allow the farmer to properly control the climatic atmosphere during the production cycle. The most important factors influencing the climatic atmosphere inside a cattle building are temperature, humidity, and greenhouse gas emissions. We propose a case study for a wireless sensor network model placed on a cattle farm, in which each measurement node “mote” collects environmental data (temperature, humidity, and emission gas), in order to control the building's climate, this data is stored and managed in a remote database. We will present HBase, a NoSQL database management system, based on the concept of distributed storage, a column-oriented database that provides the read/write access to data on the HADOOP HDFS file system in real-time. The storage results presented in this paper are obtained via a java code that can connect with the HBase database, in order to store the received data at every second from each node constituting the measurement system via HTTP requests.
Factors influencing the choice to buy food products in Morocco
Authors: Zogaam Gharbi Loubna , Guennouni Morad , Aouane Mahjoub
Published: February 2021

The article looks at the different factors that go into the subject of buying food products in Morocco. The latter, is undergoing a food transformation affecting the urban and rural environment. The recent changes in the choice of purchasing products by Moroccan citizens have created in the country a favorable framework for the development of territorial products. This is a descriptive study based on a questionnaire and conducted over a period of 2 months, subjects with a sample size of 180 respondents are randomly recruited on social networks. The results show that consumers are now interested in where they buy food, the quality of the products and the cost/quality ratio in these places. This study also states that despite the importance of product price to the consumer, quality is the factor most sought after by the consumer. This leads to an obligation on the part of consumers to industrialists to integrate food products with high nutritional values and to use ingredients that do not cause a danger to human health.
The conservation agriculture in northwest of Morocco (Merchouch area): The impact of no-till systems on physical properties of soils in semi-arid climate
Authors: El Mekkaoui Abdelali , Moussadek Rachid , Mrabet Rachid , Chakiri Said , Douaik Ahmed , Ghanimi Ahmed , Zouahri Abdelmjid
Published: February 2021

Conservation agriculture (CA) is characterized by three principles: minimum tillage, even the total absence of tillage in the case of direct seeding (NT), permanent soil cover by mulch, and diversification of crops. Its main objective is to control soil degradation by conserving the physical and biological properties and fertility of the soil, which leads to an improvement in productivity, while preserving the environment. Conventional tillage (CT) used in the arid and semi-arid environments of Morocco (particularly in the study site area of Merchouch) compromise the productivity of established crops in these regions. The work presented consists in the study of the impact of NT on the physico-chemical properties of the soil, especially organic matter (SOM), bulk density (BD), soil moisture (θg), and structural stability (SS) in semi-arid zones. The results show that the use of the NT system positively influences the accumulation of SOM, especially at the soil surface horizon (0-5cm). Concerning θg, there is a significant difference between the two treatments (NT and CT) at the average of the three depths and especially at the horizon 20-40 cm so NT increases the water retention capacity. This study also shows that the mean weight diameter (MWD) of the 3 tests (water, ethanol, and rehumectation) is higher for NT compared to CT. This shows that no-till helped to build a good soil structure over time, which is highly desirable for improving agricultural productivity and conserving natural resources, especially water.
Modeling of discharges from the breeding basins of rainbow trout fed with three extruded feeds (B, F1, and F2)
Authors: Ouaissa Khadija , Kritihi Assia , Oumessoud Youness , Maychal Abdel Aziz , Hasnaoui Mustapha
Published: February 2021

The main of this study is to estimate the maximum density of fish in the growing basins of rainbow trout (Oncorhynkiss Mykiss) species by mathematical equations, which will be used to introduce environmental concerns. Indeed, these equations make it possible to estimate the maximum density of fish fed by the extruded feed B and the two elaborated exruded feeds (F1 and F2) to achieve an optimal production without harming the environment. Note that the elements (PO43-, NH4 +, NO2-, NO3-, SM, COD) were analyzed during the rainbow trout grow-out test in the breeding station of 'Oum Er rbia. According to the results of density modeling as a function of physicochemical parameters, production can increase up to a density of ρF2 = 237.09 Kg / m3 without affecting the quality of the water while respecting the required standards. Our results show that the F2 formulation, containing 60% protein of animal origin and 40% of vegetable protein gives great zootechnical growth of rainbow trout with a low production of fish waste.
Fecal pollution indicators removal by a vertical Multi-Soil-Layering system in domestic wastewater in Morocco
Authors: Taouraout Aziz , Chahlaoui Abdelkader , Belghyti Driss , Taha Imane , Bengoumi Driss , Bouamri Rachid
Published: February 2021

The aim of this study is to evaluate the ability of the vertical Multi-Soil-Layering filter (V-MSL) to remove indicators of fecal pollution from domestic wastewater under Moroccan conditions. To do this, a V-MSL filter measuring 20 cm deep, 60 cm wide, 78 cm high was installed near the guardian's house of the Razi’s middle school in Meknes to treat domestic wastewater. Three hydraulic loads (250 L/m2/day, 350 L/m2/day and 500 L/m2/day) were tested. This filter showed an average reduction of (97.5 ± 0.3)%, (97.7 ± 0.4)% and (96.0 ± 0.7)%, for total coliforms, fecal coliforms and fecal streptococci, respectively. The performance of the filter was not affected a lot when changing the hydraulic head from 250 L/m2/day to 500 L/m2/day. The bacterial load concentrations at the filter outlet are slightly higher than the WHO recommended standard (1000 CFU / 100mL) for reuse of wastewater in irrigation. To remedy this situation, we recommend the adoption of the principle of treatment of excreta at the source by the use of dry toilets and the treatment of gray water only by the V-MSL filter.
Urban resilience in a context of climate change
Authors: Mahdaoui Kamilia , Alibou Jamal
Published: February 2021

Morocco has experienced many weather events that have been increasingly aggravated by climate change, a global, irreversible and anthropogenic phenomenon. They have a major impact on the main sectors of the economy and on the infrastructure. The objective of the study is to propose adaptation options and the plan for their implementation to improve the resilience of certain infrastructure to climate risk, a necessary but not sufficient condition to ensure the smooth functioning of the city. The methodological approach used is the quantitative approach which consists in quantifying the selected indicators attributed to the key elements of the impact chains and normalizing, weighting and aggregating them in order to obtain as desired results the vulnerability and climate risk scores in the form of tables and interactive maps of the study area for a better interpretation (Very low, low, medium, high, very high). On the basis of these results, effective and operational adaptation measures will be suggested. Thus, having a plan for implementing adaptation options is vitally important for a city to be resilient and less vulnerable to climate risk.
The effects of noise pollution on the citizens in Ho Chi Minh City
Authors: Nguyen Tan Danh
Published: February 2021

Social development, along with the process of industrialization and modernization of the country has led to a series of negative effects on the natural environment and human living environment. Among them, noise pollution has seriously affected the health and life of the people. While noise pollution causes a lot of harm, people pay little attention to this issue. People living in areas with too much noise often lose sleep and are prone to stress, fatigue, and disease. Moreover, living in a noisy area for too long can lead to heart failure, which can be fatal. If people who are being treated for a disease live in a noisy and polluted place, the recovery process will be slower, or even not recovered. Not only that, but the noise also makes children easily distracted, making their learning and knowledge reception seriously affected. The following article gives researches on the origin, cause and current status of the noise pollution problem in Ho Chi Minh City as well as methods to overcome this situation. Through the process of synthesizing and analyzing data together with survey results, the article mentions the alarming situation of environmental pollution in Ho Chi Minh city and offers some implementation solutions.
The impacts of transportation vehicles on environment: The case of Ho Chi Minh City
Authors: Lo Dinh Dinh
Published: February 2021

Currently, all people are joining hands to contribute to environmental protection, together heading towards a green and beautiful city. However, environmental pollution in Vietnam is getting more and more serious, especially air pollution. Most of the cause of air pollution is from factory and transport emissions, especially in large cities with densely populated populations such as Hanoi and Ho Chi Minh city, a large amount of emissions big waste released into the environment every day. The polluted air affects the health of the people living in these cities, which is also the main cause of the hot greenhouse effect globally. Despite the calls to protect the environment, such environmental pollution is getting more serious. Therefore, it is very practical to study the air pollution in our country. The paper uses and analyses recent research papers as well as survey results carried out in Ho Chi Minh City to further clarify people's perception of an increasingly serious environmental problem.
A diachronic study of Ourika watershed land in the High Atlas of Morocco
Authors: Elmalki Meysara , Mounir Fouad , Ichen Abdellah , Khai Thami , Aarab Mohammed
Published: February 2021

The Ourika watershed, located in the North-West of Moroccan High Atlas, has undergone several spatio-temporal changes and accelerated land use dynamics as a result of the interaction of climatic, topographic and anthropogenic factors. The objective of this study is to monitor the evolution of land use in the study area over the past 33 years. Landsat satellite imagery has been chosen for land cover mapping, providing a sufficient detail to identify land cover characteristics while providing more or less complete coverage of the area of action. Landsat 5 Thematic Mapper satellite images from 1987 and Landsat 8 Operational Land Imager from 2019 were used, with a spatial resolution of 30m. The images were treated and classified using Support Vector Machine algorithm (SVM) implemented on QGIS Geographic Information System software. The classification evaluation shows a Kappa coefficient of 85% and 84% and an overall accuracy of 95% and 94% for 1987 and 2019 respectively. Furthermore, the results showed a 10% decrease in the forest as well as a significant increase in the pasture, arboriculture, bare land and buildings with a respective percentage of 5.99%, 1.67%, 1.48% and 1.37% accordingly.
The spatio-temporal evolution of the genus Nitzschia Longissima at the level of the lagoon in Nador, Morocco
Authors: Riouchi Ouassila , El Madani Faid , Abadie Eric , Skalli Ali , Baghour Mourad
Published: February 2021

This work aims to study the spatio-temporal evolution of the genus Nitzschia longissima, one of the most important genera of marine plankton diatoms, from 3 sampling stations in the Nador lagoon and during 2 seasons (spring and summer 2018), Using Nitzschia longissima, as a study system, one of the most diverse and abundant genera among marine planktonic diatoms. This species counts, in addition to the form Nitzschia longissima forma parva Grunow, three varieties namely Nitzschia longissima var. closterium (W. Smith) Van Heurck, Nitzschia longissima var. longissima (Breb.) Ralfs and Nitzschia longissima var. reversa Grunow. Nitzschia Longissima genus density was high during the warm season (Summer 2018) with a value of 8000 cells/liter, and low during the cold seasons (Spring 2018), which may be caused by water temperature and zooplankton community structure; and underwater light intensity was an important factor influencing the spatial distribution of Nitzschia density.
Influence of speculative operations on the investment capital: Anempirical analysis of capital markets
Authors: Slobodianyk Anna , Abuselidze George
Published: February 2021

The article is devoted to substantiation of significance of speculative operations and follows the goal to study their condition and development. The purpose of this article is to reveal the essence of the speculative component of the movement of investment capital in stock exchange. It is substantiated that existence and stability of the securities market plays a significant role in development of financial market, which in turn becomes a key element in the mechanism of economy. The authors emphasize that the liquid market continues to function even with a large number of economic agents while price fluctuation of securities have a little change. It has been established that speculation can be carried out on the stock exchange both using cash and in futures transactions. However, operating with cash transactions has fewer combinations and in general less profitable, thus the main arena of speculators becomes the market of future transactions. It has been proven that speculative profits are possible during both “bullish games” and in shorting’s, thus becoming an important tool for additional attraction of investments. Consequently, speculations have a crucial role in achieving a balance between capital market participants.
The role of scientific research on nuclear radiation waste management and preserving environment
Authors: Alhousali Abdulsamad , Bourekkadi Salmane , Azougagh Mohamed , Boukhal Hamid , Alibrahimi Elmehdi , Elmahjoub Chakir
Published: February 2021

On the level of this article, we deal with nuclear radiation (and their residues), which is defined as a physical phenomenon and strong atomic activity that occurs in unstable atoms of elements. We are interested in studying radiation as the emission or diffusion of energy into space in the form of electromagnetic waves or particles. The scientist Fermi (1934 AD) is among the first to present scientific research in this field. Radioisotopes are considered one of the most prominent discoveries of modern science and based on the importance of the topic, scientists and researchers searched for methods and techniques to facilitate the implementation of practical applications for radiation measurement, and among those methods a specialized program was used to simulate radiation dose (digital simulation in a computer through the use of an imaginary model of the radiometric process with technology Monte Carlo using code (Geant 4). We have also highlighted the views of researchers and specialists in the area of disposal of radioactive waste, relying on a field study and a comparison of some of the currently adopted techniques to get rid of the negative consequences that each unreasonable (reckless) management and measure of this radioactive waste may have Among the most prominent results we have reached is highlighting the weakness of dealing with this topic and not giving it the right to research and scientific achievements carried out by researchers, which increases the complexity of the situation and from which it is difficult to control the problem in the future.
The effect of foliar application of Ulva rigida extract on the growth and biochemical parameters of wheat plants
Authors: Latique Salma , Ben Mrid Reda , Kabach Imad , Yasri Abdelaziz , Kchikich Anass , Nhiri Mohamed , El Kaoua Mimoun , Douira Allal , Selmaoui Karima
Published: February 2021

Many research studies have shown the importance of seaweed extract in agriculture. Marine macroalgae are rich in diverse compounds like lipids, proteins, carbohydrates, phytohormones, amino acids, osmoprotectants and minerals. In this study, we have tried to characterize Moroccan macroalgae species Ulva rigida collected from the coastal area of Akhfenir in order to evaluate their potential to improve growth plant. The proximate composition, mineral element (Ca, K, Mg, Na and Cl), pigments, amino acid, proteins, lipids, polyphenol contents were determined in liquid extract obtained from green seaweed (SWE) Ulva rigida. Results show that the application of SWE at different concentrations (0,12.5, 25, 50%) significantly enhanced growth parameters, especially with 25% of seaweed liquid extract. Therefore, algal treatment by foliar application is proved to be an effective technique to improve the growth of wheat plants. This study provides important information on the characterization, identification and utilization of seaweed resources for agriculture as biostimulants.
Seasonal Changes of sandflies: A study of the Endemic Outbreak of Leishmania Major in Zagora, Southeast Morocco
Authors: Al-Koleeby Zalalham , El Aboudi Ahmed , Faraj Chafika
Published: February 2021

Leishmaniasis is endemic in the province of Zagora and presents a real danger to the health situation. It is manifested by endemic morbidity. The objective of this study is to assist in vector control measures by providing information on the richness, abundance, seasonal trend, presence and sex ratio of sand fly species in this active epidemic. The study was conducted in Bleida locality in the province of Zagora, during an outbreak of L. major. The results of this study, undertaken in 2019, showed the predominance of Ph. papatasi (44.8%), followed by Ph. longicuspis (26.3%) and S.schwetzi(8.2%).The analysis supports the involvement of P. papatasi as a vector of L. major in Bleida locality. which indicates the increase of cutaneous leishmania in the province of Zagora.
Synthesis and characterization of apatite silicated powders with wet precipitation method
Authors: Labjar Houda , Chaair Hassan
Published: February 2021

The synthesis of apatite silicated Ca10(PO4)6-x(SiO4)x(OH)2-x (SiHA) with 0≤x≤2 was investigated using a wet precipitation method followed by heat treatment using calcium carbonate CaCO3 and phosphoric acid H3PO4 and silicon tetraacetate SiC8H20O4 (TEOS) in medium of water ethanol, with three different silicate concentrations. After drying, the samples are ground and then characterized by different analytical techniques like X-ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR) and Scanning electron Microscopy (SEM) and chemical analysis.
Induced mutagenesis for improving water stress tolerance in durum wheat (Triticumturgidum L. subsp. durum)
Authors: Elyadini Meryem , Guaadaoui Abdelkarim , ElHajjaji Souad , Labjar Najoua , Labhilili Mustapha , Gaboune Fatima , Azeqour Mohammed
Published: February 2021

Over the Water deficit is considered to be one of the most important limiting factors for crop productivity worldwide. Thus, it is important to use water resources more efficiently. One of the ways to conserve water and respond to the climate change is by using appropriate crop species and cultivars, notably which have low requirements for water.Chemical mutagens have contributed immensely to the development of a wide range of genetic variability and the improvement of several crop plants, including durum wheat. This study has the aim of understanding the effect of water stress on some morpho-physiological parameters and identifying tolerant lines to water stress from an EMS-mutated population in durum wheat. The results, under moderate (T1) and severe (T2) conditions of water stress,show the positive effect of mutagenesis on the population resulting in tolerantmutated linesto water deficit. Compared to the non-mutated, 32.15% of lines have a higher specific leaf weight; 57.14% of lines have a better ability to maintain a high water content and 75% of all lines demonstrate a very high intensity of chlorophyll fluorescence .In sum, this study has revealed the improvement of water stress tolerance in some induced durum wheat mutants.
Initiation and Propagation Characteristics of Multi-Source Fatigue Crack in Superalloy Disk
Authors: Wu Yinglong , Xuan Haijun
Published: February 2021

The multi-source fatigue crack growth characteristics of a turbine disk were studied via high-speed rotating low cycle fatigue test, fracture analysis and crack growth simulation analysis. The results show that the fatigue initiation life N0 of Superalloy disk and its simulation parts is less dispersive and similar, and the S-N0 curve of the material is not conservative to predict the N0 of the disk. The fracture of eccentric hole of disk is multi-source fatigue fracture, and the surface characteristic of the crack L/D decreases rapidly from 7.5 to 2, which is obviously different from the single source fatigue crack growth. Because of the long and thin stress distribution at the eccentric hole and the small dispersivity of GH698 crack initiation life, it's relatively easy to crack on the plane A of the eccentric hole, which is prone to multi-source fatigue. At the stage of a ≥ 1.23 mm, the reverse life of crack propagation fracture of 2# and 5# eccentric holes is consistent, and the error between the simulation value of single source fatigue crack propagation life and the reverse life is below 5%. In the stage of 0.61 mm ≤ a < 1.23 mm, the simulation crack growth rate of 5# eccentric hole of multi-source is close to that of fracture inversion. Accurate simulation analysis of multi-source crack growth needs to define the initial crack accurately, at the same time, consider the influence of existing fatigue damage on crack growth.
Target Detection of UAV Aerial Image Based on Rotational Invariant Depth Denoising Automatic Encoder
Authors: Yang Fengping , Ma Bodi , Wang Jinrong , Gao Honggang , Liu Zhenbao
Published: February 2021

The method of using unmanned aerial vehicle (UAV) to obtain aerial image information of target scene has the characteristics of wide coverage, strong mobility and high efficiency, which is widely used in urban traffic monitoring, vehicle detection, oil pipeline inspection, regional survey and other aspects. Aiming at the difficulties of the object to be detected in the process of aerial image object detection, such as multiple orientations, small image pixel size and UAV body vibration interference, a novel aerial image object detection model based on the rotation-invariant deep denoising auto encoder is proposed in this paper. Firstly, the interest region of the aerial image is extracted by the selective search method, and the radial gradient of interest region is calculated. Then, the rotation invariant feature descriptor is obtained from the radial gradient feature, and the noise in the original data is filtered out by the deep denoising automatic encoder and the deep feature of the feature descriptors is extracted. Finally, the experimental results show that this method can achieve high accuracy for aerial image target detection and has good rotation invariance.
Decision Method of Probabilistic Hesitant Fuzzy Information Based on Hamacher Aggregation Operators and MULTIMOORA
Authors: Zhu Yahui , Gao Li
Published: February 2021

Aiming at solving the problem of probability hesitation fuzzy multi-attribute decision making, a new decision-making method of probability hesitation fuzzy multi-attribute is proposed in this paper, based on Hamacher operations and MULTIMOORA method. Firstly, probability hesitation fuzzy Hamacher operations are defined, including sum, product, scalar multiplication and exponentiation, and their properties are studied. On this basis, probability hesitation fuzzy Hamacher weighted average operator and probability hesitation fuzzy Hamacher weighted geometric average operator are proposed, and their properties are also studied. Secondly, alternative from multiple perspectives are chosen and compared by using the MULTIMOORA method. Finally, the effectiveness and feasibility of the decision-making method are verified by an example.