bluuebunny/crossref_metadata_2025 huggingface dataset:
Genetically encoded formaldehyde sensors inspired by a protein intra-helical crosslinking reaction
Authors: Zhu Rongfeng , Zhang Gong , Jing Miao , Han Yu , Li Jiaofeng , Zhao Jingyi , Li Yulong , Chen Peng R.
Published: January 2021

Formaldehyde (FA) has long been considered as a toxin and carcinogen due to its damaging effects to biological macromolecules, but its beneficial roles have been increasingly appreciated lately. Real-time monitoring of this reactive molecule in living systems is highly desired in order to decipher its physiological and/or pathological functions, but a genetically encoded FA sensor is currently lacking. We herein adopt a structure-based study of the underlying mechanism of the FA-responsive transcription factor HxlR from Bacillus subtilis, which shows that HxlR recognizes FA through an intra-helical cysteine-lysine crosslinking reaction at its N-terminal helix α1, leading to conformational change and transcriptional activation. By leveraging this FA-induced intra-helical crosslinking and gain-of-function reorganization, we develop the genetically encoded, reaction-based FA sensor—FAsor, allowing spatial-temporal visualization of FA in mammalian cells and mouse brain tissues.
Conserved regulatory logic at accessible and inaccessible chromatin during the acute inflammatory response in mammals
Authors: Alizada Azad , Khyzha Nadiya , Wang Liangxi , Antounians Lina , Chen Xiaoting , Khor Melvin , Liang Minggao , Rathnakumar Kumaragurubaran , Weirauch Matthew T. , Medina-Rivera Alejandra , Fish Jason E. , Wilson Michael D.
Published: January 2021

The regulatory elements controlling gene expression during acute inflammation are not fully elucidated. Here we report the identification of a set of NF-κB-bound elements and common chromatin landscapes underlying the acute inflammatory response across cell-types and mammalian species. Using primary vascular endothelial cells (human/mouse/bovine) treated with the pro−inflammatory cytokine, Tumor Necrosis Factor-α, we identify extensive (~30%) conserved orthologous binding of NF-κB to accessible, as well as nucleosome-occluded chromatin. Regions with the highest NF-κB occupancy pre-stimulation show dramatic increases in NF-κB binding and chromatin accessibility post-stimulation. These ‘pre-bound’ regions are typically conserved (~56%), contain multiple NF-κB motifs, are utilized by diverse cell types, and overlap rare non-coding mutations and common genetic variation associated with both inflammatory and cardiovascular phenotypes. Genetic ablation of conserved, ‘pre-bound’ NF-κB regions within the super-enhancer associated with the chemokine-encoding CCL2 gene and elsewhere supports the functional relevance of these elements.
Caveolae-mediated Tie2 signaling contributes to CCM pathogenesis in a brain endothelial cell-specific Pdcd10-deficient mouse model
Authors: Zhou Huanjiao Jenny , Qin Lingfeng , Jiang Quan , Murray Katie N. , Zhang Haifeng , Li Busu , Lin Qun , Graham Morven , Liu Xinran , Grutzendler Jaime , Min Wang
Published: January 2021

Cerebral cavernous malformations (CCMs) are vascular abnormalities that primarily occur in adulthood and cause cerebral hemorrhage, stroke, and seizures. CCMs are thought to be initiated by endothelial cell (EC) loss of any one of the three Ccm genes: CCM1 (KRIT1), CCM2 (OSM), or CCM3 (PDCD10). Here we report that mice with a brain EC-specific deletion of Pdcd10 (Pdcd10BECKO) survive up to 6-12 months and develop bona fide CCM lesions in all regions of brain, allowing us to visualize the vascular dynamics of CCM lesions using transcranial two-photon microscopy. This approach reveals that CCMs initiate from protrusion at the level of capillary and post-capillary venules with gradual dissociation of pericytes. Microvascular beds in lesions are hyper-permeable, and these disorganized structures present endomucin-positive ECs and α-smooth muscle actin-positive pericytes. Caveolae in the endothelium of Pdcd10BECKO lesions are drastically increased, enhancing Tie2 signaling in Ccm3-deficient ECs. Moreover, genetic deletion of caveolin-1 or pharmacological blockade of Tie2 signaling effectively normalizes microvascular structure and barrier function with attenuated EC-pericyte disassociation and CCM lesion formation in Pdcd10BECKO mice. Our study establishes a chronic CCM model and uncovers a mechanism by which CCM3 mutation-induced caveolae-Tie2 signaling contributes to CCM pathogenesis.
Machine learning method for tight-binding Hamiltonian parameterization from ab-initio band structure
Authors: Wang Zifeng , Ye Shizhuo , Wang Hao , He Jin , Huang Qijun , Chang Sheng
Published: January 2021

The tight-binding (TB) method is an ideal candidate for determining electronic and transport properties for a large-scale system. It describes the system as real-space Hamiltonian matrices expressed on a manageable number of parameters, leading to substantially lower computational costs than the ab-initio methods. Since the whole system is defined by the parameterization scheme, the choice of the TB parameters decides the reliability of the TB calculations. The typical empirical TB method uses the TB parameters directly from the existing parameter sets, which hardly reproduces the desired electronic structures quantitatively without specific optimizations. It is thus not suitable for quantitative studies like the transport property calculations. The ab-initio TB method derives the TB parameters from the ab-initio results through the transformation of basis functions, which achieves much higher numerical accuracy. However, it assumes prior knowledge of the basis and may encompass truncation error. Here, a machine learning method for TB Hamiltonian parameterization is proposed, within which a neural network (NN) is introduced with its neurons acting as the TB matrix elements. This method can construct the empirical TB model that reproduces the given ab-initio energy bands with predefined accuracy, which provides a fast and convenient way for TB model construction and gives insights into machine learning applications in physical problems.
Recombinant MVA-prime elicits neutralizing antibody responses by inducing antigen-specific B cells in the germinal center
Authors: Eslamizar Leila , Petrovas Constantinos , Leggat David J. , Furr Kathryn , Lifton Michelle L. , Levine Gail , Ma Steven , Fletez-Brant Christopher , Hoyland Wesley , Prabhakaran Madhu , Narpala Sandeep , Boswell Kristin , Yamamoto Takuya , Liao Hua-Xin , Pickup David , Ramsburg Elizabeth , Sutherland Laura , McDermott Adrian , Roederer Mario , Montefiori David , Koup Richard A. , Haynes Barton F. , Letvin Norman L. , Santra Sampa
Published: January 2021

The RV144 HIV-1 vaccine trial has been the only clinical trial to date that has shown any degree of efficacy and associated with the presence of vaccine-elicited HIV-1 envelope-specific binding antibody and CD4+ T-cell responses. This trial also showed that a vector-prime protein boost combined vaccine strategy was better than when used alone. Here we have studied three different priming vectors—plasmid DNA, recombinant MVA, and recombinant VSV, all encoding clade C transmitted/founder Env 1086 C gp140, for priming three groups of six non-human primates each, followed by a protein boost with adjuvanted 1086 C gp120 protein. Our data showed that MVA-priming favors the development of higher antibody binding titers and neutralizing activity compared with other vectors. Analyses of the draining lymph nodes revealed that MVA-prime induced increased germinal center reactivity characterized by higher frequencies of germinal center (PNAhi) B cells, higher frequencies of antigen-specific B-cell responses as well as an increased frequency of the highly differentiated (ICOShiCD150lo) Tfh-cell subset.
A genome-wide investigation of the effect of farming and human-mediated introduction on the ubiquitous seaweed Undaria pinnatifida
Authors: Graf Louis , Shin Younhee , Yang Ji Hyun , Choi Ji Won , Hwang Il Ki , Nelson Wendy , Bhattacharya Debashish , Viard Frédérique , Yoon Hwan Su
Published: January 2021

Human activity is an important driver of ecological and evolutionary change on our planet. In particular, domestication and biological introductions have important and long-lasting effects on species’ genomic architecture and diversity. However, genome-wide analysis of independent domestication and introduction events within a single species has not previously been performed. The Pacific kelp Undaria pinnatifida provides such an opportunity because it has been cultivated in its native range in Northeast Asia but also introduced to four other continents in the past 50 years. Here we present the results of a genome-wide analysis of natural, cultivated and introduced populations of U. pinnatifida to elucidate human-driven evolutionary change. We demonstrate that these three categories of origin can be distinguished at the genome level, reflecting the combined influence of neutral (demography and migration) and non-neutral (selection) processes.
Process design and validation of a new mixed eluent for leaching Cd, Cr, Pb, Cu, Ni, and Zn from heavy metal-polluted soil
Authors: Zhao Yuyan , Li Han , Li Bing , Lai Yawen , Zang Libin , Tang Xiaodan
Published: January 2021

A new mixed eluent (EDDS + FeCl3) was successfully designed and applied for the remediation of multiple heavy metal pollution in soil.
An iron–nitrogen doped carbon and CdS hybrid catalytic system for efficient CO2 photochemical reduction
Authors: Guo Jin-Han , Dao Xiao-Yao , Sun Wei-Yin
Published: January 2021

A new iron–nitrogen doped carbon and CdS hybrid system was developed to efficiently reduce CO2 to CO under UV/vis light (AM 1.5G) irradiation in aqueous solution.
Growth mechanism of helical γ-Dy2S3 single crystals
Authors: Nikolaev R. E. , Sulyaeva V. S. , Alekseev A. V. , Sukhikh A. S. , Polyakova E. V. , Pomelova T. A. , Kuzuya T. , Hirai S. , Tran Nhu B.
Published: January 2021

The nonequilibrium evaporation of a high-temperature SnS + Dy2S3 solution leads to the implementation of a VLS-like mechanism of growth of γ-Dy2S3 helical single crystals.
Recent advances in chelation-assisted site- and stereoselective alkenyl C–H functionalization
Authors: Zhang Jian , Lu Xiunan , Shen Cong , Xu Liangyao , Ding Liyuan , Zhong Guofu
Published: January 2021

This review highlights recent advances in vicinal- and geminal-group-directed alkenyl C–H functionalizations which proceeded by endo- and exo-cyclometallation.
Recent developments of nanocatalyzed liquid-phase hydrogen generation
Authors: Wang Changlong , Astruc Didier
Published: January 2021

Nanocomposite catalysts have dramatically improved hydrogen generation from several hydrogen-rich sources in the liquid phase toward the transport of this green fuel.
Aqueous one-pot synthesis of well-defined zwitterionic diblock copolymers by RAFT polymerization: an efficient and environmentally-friendly route to a useful dispersant for aqueous pigments
Authors: North Shannon M. , Armes Steven P.
Published: January 2021

An atom-efficient, wholly aqueous one-pot synthesis of zwitterionic diblock copolymers has been devised. Such copolymers can serve as highly effective aqueous dispersants for nano-sized transparent yellow iron oxide particles.
Self-aligned sequential lateral field non-uniformities over channel depth for high throughput dielectrophoretic cell deflection
Authors: Huang XuHai , Torres-Castro Karina , Varhue Walter , Salahi Armita , Rasin Ahmed , Honrado Carlos , Brown Audrey , Guler Jennifer , Swami Nathan S.
Published: January 2021

Self-aligned sequential lateral field non-uniformities extending uniformly over the sample channel depth are fabricated using a single lithography step for enabling phenotype-specific dielectrophoretic separation of cells.
Elucidating the role of precursors in synthesizing single crystalline lithium niobate nanomaterials: a study of effects of lithium precursors on nanoparticle quality
Authors: Ali Rana Faryad , Gates Byron D.
Published: January 2021

The selection of lithium precursors correlates with the quality of lithium niobate (LiNbO3) nanoparticles prepared by solvothermal methods.
High efficiency organic–Si hybrid solar cells with a one-dimensional CdS interlayer
Authors: Lu Zhangbo , Hou Guozhi , Zhu Yu , Chen Jiaming , Xu Jun , Chen Kunji
Published: January 2021

Introducing a CdS NW interlayer: (1) reduces the contact resistance between the rear contact and Si, and (2) optimises the energy level alignment of photovoltaic devices.
The dielectric and polarization behavior of polyurethane-based polycarbonate diols with different content levels of fluorinated hard segments
Authors: Chunarrom Wannida , Manuspiya Hathaikarn
Published: January 2021

The addition of a fluorinated chain improved the polarization in polyurethane, shifted the relaxation peaks, and changed the hysteresis loop behavior from a ferroelectric to a paraelectric phase.
Dinuclear anthracene-containing alkynylplatinum(ii) terpyridine complexes with photo-modulated self-assembly behaviors
Authors: Fang Shishi , Chan Michael Ho-Yeung , Yam Vivian Wing-Wah
Published: January 2021

Facilitated by Pt⋯Pt, π–π stacking and hydrophobic interactions, a new series of dinuclear anthracene-containing alkynylplatinum(ii) terpyridine complexes is found to exhibit intriguing photo-modulated self-assembly behaviors upon photooxygenation.
Strategies for the synthesis of furo-pyranones and their application in the total synthesis of related natural products
Authors: Thorat Sagar S. , Kontham Ravindar
Published: January 2021

The furo-pyranone framework is widely present in the molecular structure of various biologically potent natural products and un-natural small molecules, and it represents a valuable target in synthetic organic chemistry and medicinal chemistry.
Improved continuous synthesis of UiO-66 enabling outstanding production rates
Authors: Polyzoidis Angelos , Reichle Steffen , Schwarzer Maud , Piscopo Calogero Giancarlo , Löbbecke Stefan , Boskovic Dusan
Published: January 2021

Optimization of the continuous synthesis of UiO-66 and derivatives with extremely high space time yield using a tubular reactor.
Unprecedented access to functionalized pyrrolo[2,1-a]isoquinolines from the domino reaction of isoquinolinium ylides and electrophilic benzannulated heterocycles
Authors: Babu Sheba Ann , A. R. Rajalekshmi , P. R. Nitha , Omanakuttan Vishnu K. , P. Rahul , Varughese Sunil , John Jubi
Published: January 2021

The reaction between electrophilic benzannulated heterocycles and isoquinolinium methylides results in a domino dipolar cycloaddition-ring opening transformation, generating functionalized pyrrolo[2,1-a]isoquinolines and S–S-bridged bis-pyrrolo[2,1-a]isoquinolines.
Hearing Aid Uptake, Benefit, and Use: The Impact of Hearing, Cognition, and Personal Factors
Authors: Nixon Grace , Sarant Julia , Tomlin Dani , Dowell Richard
Published: January 2021

Purpose

The purpose of this study was to explore the effects of hearing, cognition, and personal factors on hearing aid (HA) uptake, use, and benefit.

Method

Eighty-five older adults aged 60–80 years (M= 70.23,SD= 5.17) participated in the study. Hearing was assessed using pure-tone audiometry and the Listening in Spatialised Noise–Sentences test. Cognition was measured using the Cogstate Brief Battery and the Cogstate Groton Maze Learning task. Personal demographics were recorded from participants' answers on a series of take-home questionnaires. HA benefit and use was subjectively reported at 3 and 6 months post HA fitting for those who chose to use HAs.

Results

Stepwise-regression and mixed-effects models indicated that stronger psychomotor function predicted greater reported use of HAs at 3 and 6 months post HA fitting. Greater family interaction scores also predicted greater HA use at 3 months after fitting. Participants who chose to be fitted with HAs had significantly poorer self-reported health and poorer audiometric thresholds. Poorer hearing was also significantly related with greater reported HA benefit.

Conclusions

A combination of cognitive, psychosocial factors and hearing impacted HA outcomes for the older Australians in this study. Self-reported HA use was significantly greater in participants with better psychomotor function. Furthermore, those with poorer self-reported health were more likely to choose to use HAs. These factors should be considered in audiological rehabilitation to best maximize patient HA outcomes.
City buses’ future velocity prediction for multiple driving cycle: A meta supervised learning solution
Authors: Cao Jianfei , He Hongwen , Cui Xing
Published: January 2021

Vehicular velocity prediction is of great significance to intelligent transportation system, as it provides a possible future velocity sequence for vehicle's decision‐making system. A velocity prediction method via meta learning is proposed, which provides an adaptive and generative framework for multiple‐driving cycles. The prediction model is devised using a deep neural network structure. The model's training is performed by the recently proposed meta‐supervised learning, which ensures that one trained model could meet the adaptability to multiple driving cycles. The complete framework consists of three parts: Pre‐training, fine‐tune‐training and real‐time prediction, which is tested to predict the hybrid electric city buses’ future velocity in a variable traffic scenario. The average prediction accuracy of 3, 5 and 10 s horizons is 0.51, 0.63 and 0.88 m s−1, which is 25.9%, 16.78% and 7.47% higher than that trained by the conventional supervised learning method. As suggested, the proposed prediction method is effective and could meet the requirement of energy‐saving control for hybrid electric city buses. With further study, potential application of this method may also exist in the field of driving behaviour prediction and transportation mode recognition.
Les écoles-acteurs en Guadeloupe, un espace de débat sur les pollutions agricoles et le devenir de l’agriculture
Authors: Tonneau Jean-Philippe , Bonnal Vincent , Bourgoin Jeremy , Cheval Agathe , Jannoyer Magalie , Chéry Jean-Pierre , Cattan Philippe
Published: January 2021

Le projet RIVAGE veut favoriser l’adoption de pratiques alternatives pour gérer les impacts de la pollution diffuse dans le bassin versant de la rivière Pérou en Guadeloupe. Son objectif est de produire et partager les connaissances sur les processus, les impacts et les pratiques innovantes avec les acteurs du territoire. Pour faciliter la prise en compte des résultats, le projet a créé une « école-acteurs ». L’école-acteurs est un espace d’échanges autour des thématiques liées à la pollution diffuse agricole. Le concept d’école-acteurs fait référence aux théories d’éducation populaire et d’apprentissage collectif. L’article rappelle ces références théoriques et les utilise dans un processus d’auto-évaluation des premiers résultats obtenus par l’école-acteurs. Les auteurs dressent quelques enseignements et orientations pour le futur.
Constrained Discrete Model Predictive Control of a Greenhouse Relative Humidity
Authors: Hamidane Hafsa , El Faiz Samira , Lachhab Abdeslam , Guerbaoui Mohammed , Ed-Dahhak Abdelali
Published: January 2021

In this paper, we present a Constrained Discete Model Predictive Control (CDMPC) strategy application for relative humidity control. In this sense, and for our system inside humidity dynamics description, a green-house prototype is engaged and a state space form which fits properly a set of collected data of the greenhouse humidity dynamics is presented as mathematical model. This latest is used for the CDMPC starategy application, which purpose is to select the best control moves based on an optimization procedure regarding the constraints on the control. By the means of Matlab/ Simulink and Yalmip toolbox algorithms, numerical simulations were held to proove the effectiveness of the controller, garanteeing both the constraints feasibility and system stability.
Numerical and experimental study of the Behaviour of notched HDPE
Authors: Elkori Rabiaa , Laamarti Amal , Elhad Khalid , Hachim Abdelilah
Published: January 2021

It is important to study the Behaviour of high-density polyethylene (HDPE) under notch effects as it is widely used in industrial applications (Qi, 2018). However, there are only a few studies on the Behaviour of HDPE with defects, this work aims to study the deformation mechanisms under a tensile test experimentally performed on blank and notched specimens at constant speed and room temperature, and by developing our study by simulating HDPE using commercial software code.
Numerical study of heat and mass transfer in a desalination system
Authors: El Baamrani H. , Bammou L. , Aharoune A. , Boukhris A.
Published: January 2021

In today’s world the demand for freshwater, to meet the needs of human activities is growing exponentially. As a result, manufacturers are continuing to make progress in the design and production of efficient desalination and cooling units to optimize and reduce the overall cost of production. In this work, we study the numerical study of the evaporation of a thin liquid film dripping by gravity with constant feed rates in a closed rectangular cavity formed by two parallel flat plates. The wall which supports the liquid film is heated by a constant temperature heating, while the other is kept at a constant and uniform temperature to condense the formed vapor. The results obtained show that the heat transfer in the distillation cell is dominated by the latent heat transfer associated with the evaporation. The results also show that the temperature of the film increases slightly for the heating zone and then decreases over most of the plate for the evaporation zone
Cooperative benchmarking at the heart of public policies
Authors: Bouhazzama Malak , Said Mssassi
Published: January 2021

In Morocco, the emergence of the cooperative sector in a structured and organized form dates back to the 1980s, although the culture of solidarity, mutual aid and collective work constitute a component of Moroccan culture and traditions. Indeed, social economy organizations, particularly associations and cooperatives, have rapidly developed thanks to the efforts made by the State, especially in the rural world for the financing and support of development projects, the fight against illiteracy, precariousness and poverty, the promotion and integration of women into the economic circuit. Even today and since May 18, 2005, the date of the launch of the National Human Development Initiative (INDH) by His Majesty King Mohamed VI, the aim of this study is to compare the Moroccan Model of cooperative with the other’s counties models.
Energy Estimation Based on Path Tracking for a Differential Drive Wheeled Mobile Robot
Authors: Fadlo Said , Rabbah Nabila , Ait Elmahjoub Abdelhafid
Published: January 2021

To improve the energy efficiency of mobile robots and increase their time of operation, a comprehensive energy model is needed. Having such a model requires a lot of complex analysis and design time. There has been a lot of research into optimizing the power consumption of mobile robots but have not benefited from the advantages of languages to model complex cyber-physical systems. In this work, we used the Simscape™ MATLAB® environment to simplify and speed up the design of an energy consumption model of a differential drive mobile robot. We also estimated the energy consumption of the mobile in a different path tracking scenario. Our results show that is possible to obtain a good accuracy of path following with acceptable energy consumption.
Elaboration of TiO2 Ultrafiltration Membrane Deposited on Moroccan Sahara Clay
Authors: Ait Baih Mohamed , El Qacemi Nour Elyakin , Zidouh Hamid , Bakka Abdelhamid , El Baraka Noureddine , Mamouni Rachid , Saffaj Nabil
Published: January 2021

In this work, the porous ceramic multilayer ultrafiltration membrane is developed. Macroporous support was formed by extrusion of ceramic paste derived from natural Moroccan Sahara Clay. The microporous interlayer was then performed by slip casting from zirconia commercial powders and finally the active ultrafiltration toplayer was obtained by solgel route using TiO2 sol. The performance of TiO2 ultrafiltration membrane was evaluated by pores diameter, thickness of the top layer, water flux, and molecular weight cut off (MWCO). The water permeability measured for this composite membrane is 9.051 l/(m2·h·bar), the thickness is around 900nm, the pore diameter is centered near 7nm and the MWCO was about 5000Da.
Commissioning Measurements of Electron Beam Using Montecarlo Algorithm on Truebeam STx® and Compariaon with Clinac iX Linear Accelerator
Authors: Saidi Kamal , El Baydaoui Redouane , El Gouach Hanae , Kaanouch Othmane , Mesradi Mohamed Reda
Published: January 2021

TrueBeam STx latest generation linear accelerators (linacs) installed at Sheikh Khalifa International University Hospital in Casablanca, Morocco.

The aim of this is to present and compare the result of the Electron commissioning measurement on TrueBeam Stx and clinac iX installed at Sheikh Khalifa International University Hospital in Casablanca, Morocco. A compariaon of eMC calculations and measurements for TrueBeam Stx were evaluated.

Dosimetric parameters are systematically measured using a large water phantom 3D scanning system MP3 Water Phantom (PTW, Freiburg, Germany). The data of the electron beams commissioning including depth dose curves for each applicator, depth dose curves without applicator and the profile in air for a large field size 40x 40cm2, and the Absolute Dose (cGy/MU) for each applicator. All the data were examined and compared for five electron beams (E6MeV, E9MeV, E12MeV, E16MeV and E20MeV) of Varian’s TrueBeam STx and Clinac iX machines.

A comparison, between measurement PDDs and calculated by the Eclipse electron Monte Carlo (eMC) algorithm were performed to validate Truebeam Stx commissioning. All this measurements were performed with a Roos and Markus plane parallel chamber.

Our measured data indicated that electron beam PDDs from the TrueBeam Stx machine are well matched to those from our Varian Clinac iX machine.

Significant differences between TrueBeam and Clinac iX were found in in‐air profiles and open field output. Maximum depth dose for the TrueBeam Stx and Clinac iX for the following energies (6, 9, 12, 16, 20 MeV) are respectively (1.15; 1.89; 2.6; 3.1; and 2.35) and (1.24; 1.95; 2.70; 2.99 and 2.4cm). For the TrueBeam Stx and Clinac iX the quality index R50 for applicator 15x15 cm2 are in the tolerance intervals. Surface dose increases by increasing energy for both machines.

The Absolute Dose (cGy/MU) calibrated for both machine in Dmax at 1cGy/MU for the reference field size cone 15x15 cm2.

Bremsstrahlung tail Rp per energy levels as follows for the TrueBeam Stx : 6 MeV – 2.85 cm, 9 MeV – 4.28 cm, 12 MeV – 5.97 cm, 16 MeV – 7.88 cm and 20 MeV – 9.86 cm. and for the

Clinac iX : 6 MeV – 2.86 cm, 9 MeV – 4.32 cm, 12 MeV – 5.96 cm, 16 MeV – 7.93 cm and 20 MeV – 10.08 cm.

A good agreement between modeled and measured data is observed.
Experimental trial on the electrical characteristics of photovoltaic panels under the effect of a simulated failure
Authors: Sekkal M.C. , Belhachi S. , Touati F.I. , Saada S. , Ziani Z.
Published: January 2021

In this work we measure electrical characteristics of different panels following the addition of a simulated failure, namely cracks on the protective layer of photovoltaic cells. The objective is to see its influence on the electrical production of panels on one side, and to see if it is possible to diagnose this failure on the other. The cracks are simulated using broken transparent plates that will be positioned on each solar panel before measuring its real characteristics. The results show that despite the continuity of the operation of the photovoltaic equipment in the presence of cracks, those last clearly influence the electrical power supplied by the panel. Among other things, they give a very particular form to its I-V characteristic which can be used to detect this failure.
Traffic optimization in IoT networks
Authors: Ouahi Hassan , Mazoul Abdenbi
Published: January 2021

Since the 2000s, the idea that the Internet could be used for machine-to-machine communication and process automation has emerged. Together with the development of electronic objects capable of communicating with IP protocols, this idea led to the concept of the Internet of Things (IoT Internet of Things). Nowadays, the evolution of networks is very intense. New networks are appearing, “all-optical” solutions in the heart of networks, “wireless” solutions to facilitate access to users or to implant sensors / actors in places difficult to access, or finally the Internet of communicating objects. In this evolution, new scientific issues and challenges are emerging. Some of the problems are related to the optimization of generated traffic as well as the improvement of the performance of tools and techniques. Often, these optimization problems lead to models using graphs. The analysis of optimization problems in networks is an important activity. IOT networks create more data traffic that is difficult to control within the operator’s network. The method given in this paper will help network operators optimize their networks and assist developers in improving hardware and software interactions to reduce data traffic in the network.
ORB-SLAM accelerated on heterogeneous parallel architectures
Authors: Mamri Ayoub , Abouzahir Mohamed , Ramzi Mustapha , Latif Rachid
Published: January 2021

SLAM algorithm permits the robot to cartography the desired environment while positioning it in space. It is a more efficient system and more accredited by autonomous vehicle navigation and robotic application in the ongoing research. Except it did not adopt any complete end-to-end hardware implementation yet. Our work aims to a hardware/software optimization of an expensive computational time functional block of monocular ORB-SLAM2. Through this, we attempt to implement the proposed optimization in FPGA-based heterogeneous embedded architecture that shows attractive results. Toward this, we adopt a comparative study with other heterogeneous architecture including powerful embedded GPGPU (NVIDIA Tegra TX1) and high-end GPU (NVIDIA GeForce 920MX). The implementation is achieved using high-level synthesis-based OpenCL for FPGA and CUDA for NVIDIA targeted boards.
Random Forest for video Text Amazigh
Authors: Rachidi Youssef
Published: January 2021

In this paper; we introduce a system of automatic recognition of Video Text Amazigh based on the Random Forest. After doing some pretreatments on the video and picture, the text is segmented into lines and then into characters. In the stage of characteristics extraction, we are representing the input data into the vector of primitives. These characteristics are linked to pixels’ densities and they are extracted on binary pictures. In the classification stage, we examine four classification methods with two different classifiers types namely the convolutional neural network (CNN) and the Random Forest method. We carried out the experiments with a database containing 3300 samples collected from different writers. The experimental results show that our proposed OCR system is very efficient and provides good recognition accuracy rate of handwriting characters images acquired via Video camera phone.
Optimal Energy Allocation Algorithm of Li-Battery/Super capacitor Hybrid Energy Storage System Based on Dynamic Programming Algorithm
Authors: Zheng Xiaokun , Jiang Wei , Yin Lu , Fu Yanan
Published: January 2021

The establishment of an integrated fast charging station for photovoltaic storage and charging is an effective solution to fast charging of electric vehicles. For the li-battery/Super capacitor hybrid energy storage system, it is an effective method to reduce the cost of the system by extending the life of the li-batteries. This paper establishes the li-battery cycle life estimation model with irregular discharge and proposes an optimal energy allocation algorithm of li-battery/super capacitor hybrid energy storage system is proposed based on dynamic programming algorithm. Simulation results are presented to validate the theoretical analysis.
Research on the control technology of self-synchronous voltage source inverter for distributed parallel system
Authors: Zhong Xu , Zhu Runqiu , Hou Kai , Yuan Weifeng
Published: January 2021

In this paper, a small signal model based on droop controller is established for the self-synchronous voltage source parallel system. The influence of droop coefficient on system stability is analysed, and the constraint conditions of droop coefficient are given. Based on the analysis of the parallel system of self-synchronous voltage source inverter, a multi-machines parallel control scheme of self-synchronous voltage source inverter is formulated. The model and test platform are built to carry out the parallel simulation and experimental verification of distributed line impedance parameters. Simulation and experimental results show that the proposed control strategy can achieve good dynamic and steady-state power sharing.
Hybrid Solar Forecasting Method Based on Empirical Mode Decomposition and Back Propagation Neural Network
Authors: Aghmadi Ahmed , El Hani Soumia , Mediouni Hamza , Naseri Nisrin , El Issaoui Fatima
Published: January 2021

In order to improve the accuracy of solar radiation prediction and optimize the energy management system. This study proposes a forecasting model based on empirical mode decomposition (EMD) and Back Propagation Neural Network (BPNN). Empirical mode of decomposition (EMD)-based ensemble methods with powerful predictive abilities have become relatively common in forecasting study. First, the existing solar radiation datasets are decomposed into an intrinsic mode function (IMF) and one residue produces fairly stationary sub-series that can easily be modeled on BPNN. Next, both components of the IMF and residue are applied to create the respective BPNN models. Then, the corresponding BPNN is used to predict some sub-series. Finally, the predictive values of the original solar radiation datasets are determined by the sum of each predicted sub-series. Compared with traditional models such as conventional neural network or ARIMA time series, the hybrid EMD-BPNN model shows great results in term of RMSE with 28.13 (W/m2). On the other hand, the result of BPNN and ARIMA was 83.28 (W/m2) and 108.88 (W/m2), respectively. that the non-stationary and non-linear of solar radiation signal has less effect on the accuracy of the prediction.
Effect of an Internal Impact Balance Mechanism on the Perceptible Recoil of Machine Gun
Authors: Liu Qiang , Zhou Kedong , Shen Chao , He Lei
Published: January 2021

In order to reasonably reduce the perceptible recoil of firearms, and design a recoil reduction device that can be commonly used in automatic rifles, semi-automatic rifles, and machine guns, a balancing mechanism for recoil reduction technology was proposed in this paper. With the perceptible recoil generated by the impact from automat to the balance mechanism as the objective function, the parametric analysis of the mass of the balance weight and the spring stiffness of the balance mechanism was conducted. The analysis showed that the influence of the mass of the balance weight on the reduction of the perceptible recoil of the balance mechanism is obviously greater than that of the spring stiffness of the balance mechanism within the allowable ranges of the two factors. The research results provide a reference for gun recoil reduction technology.
An Improved Design of the Engine Bench Test Tool for the Dual Mass Flywheel (DMF)
Authors: Dong Fan , Zhang Hong , Wang Ben , Du Zeguo , Yang XiaoYu
Published: January 2021

At present, a lot of passenger cars and light trucks are equipped with the dual mass flywheel, which can decrease the non-uniformity of the indicated engine torque. In engine bench test, the secondary mass of the dual mass flywheel can’t be fixed because there is no transmission system on the test bench. As a result, the secondary mass of the dual mass flywheel will have radial and circumferential movements, which may lead to a damage to the dual mass flywheel. This paper presents an improved design of the crafting tool for the dual mass flywheel to protect the secondary mass during the engine bench test. For the improved design, the cylinder body is used for the positioning of the crafting tool, and a spline shaft and a ball bearing of centripetal adjustment are chosen to fix the secondary mass. Through this tool, the dual mass flywheel engine can be tested on the test bench without a starting shaft, and the disassembling of the engine flywheel bolts during the hot test can be avoided.
Research and Mathematic Simulation of the Pollution Particle Motion Process in the Fluid Stream under Effluents Treatment
Authors: Safarov Jamil
Published: January 2021

The article covers the issues of the mathematic simulation of the pollution particle motion process in the fluid stream, and there are defined the options influencing the process of the sweat. There are also analysed the challenging problems of the effluent water dispose. There is also devoted attention to the updating of the sedimentation process by the use of constrained features which exclude sediments in the objectionable points of the cleansing system and etc.
An Analysis of Economic Feasibility on The Hybrid Maize Farming of The Bima 20 URI on Several Types of Land in East Nusa Tenggara
Authors: da Silva Helena , Seran Yohanes L.
Published: January 2021

Evaluation on feasibility of seed is carried out at the breeding level in Nagekeo Regency during 1 ( one ) year (2015 ) and the result of F1 is evaluated in the agro-ecosystem of wet rice field ( Nagekeo District ), dry land ( Kupang district ) and land of Ahuklean (Malaka district ). The results shows that: a) the average productivity of the F1 Bima 20 URI seeds is 3,200 kg/ha, however, if the price of seed was IDR 27,500/kg, the breeder will get a profit of IDR 20,496,000. b) Corn productivity of the F1 Bima 20 URI which was planted in agro-ecosystem of irrigated wet rice field, dry land and land of ahulean respectively 6.75 tons/ha, 5 tons/ha and 3 ton/ha with a profit of each respectively of IDR 22,220.00 and IDR 15,220,000, IDR 8,850.00; c) The value of R/C ratio of the seed breeder of the F1 Bima URI 20 was of 2.63 and the value of R/C ratio of the hybrid Bima URI 20 in various agroecosystems of 4.65, 3.18 and 2.81. Thus, the seeding and development of the hybrid corn Bima URI 20 in NTT is reasonably to be carried out.
Farmers’ social economic and response determining application component technologies of “Jajar Legowo Super”technique: a case in Lampung
Authors: Sirnawati Enti , Mailena Lira , Suheimi Dedi
Published: January 2021

‘Jajar Legowo Super’ (Jarwo Super) technique is a technology package comprise of seven component technologies for maximum rice productivity. The technique is one of priority attention in IAARD’s dissemination activity. This paper aims to identify how social, economic characteristics, farmers’ response and application of the technology package. The unit analysis is the component technologies adopted in the Jarwo Super. The Data was taken from 43 farmers purposively (co-operator and non-co-operator) in Tanggamus, Lampung and did descriptive analysis. The results show that ‘legowo’ was the most known component in the jarwo super technique. In contrast inpari 30 was the most ‘implemented and applied’ components. Farmers dominantly use informal network to gather information through other farmers and community leaders. Further, their participation in training is relatively low due to the absence of these activities. However, access to mass media and radio is quite high, although usage internet access is still low. In term of economy aspect, 69 percent respondents use own finance and the rest use access banking and individuals including middlemen and kiosks. To conclude, farmers use single or partial component technology rather that adopt full package of the jarwo Super technique. Only reliable and available component will farmers’ use.
Knowledge Enhancement of Field School Participants and Perception on Shallot Multiple Production Program (Proliga) in Sigi District
Authors: SP Rahayu Heni , Risna  , Saidah
Published: January 2021

Shallot’s fluctuations in production are able to influence the inflation rates where a deficit on shallot supply makes the price of shallot in the high level. One program to increase shallot ’s production is through Multiple Production Programs or Proliga which mainly use True Seed of Shallot. To spread these technologies, a dissemination method is needed, one is through the field school (FS) for extension workers and potential shallot farmers. An evaluation needs to be carried out to assess the effectiveness of the dissemination. The study aims to determine the increase in participant’s knowledge after attending the field school of shallot and their perception to the technologies. Data collection used a questionnaire taken twice, namely the initial test (pre-test) and the final test (post-test) after the field school activities. Data were analyzed using non-parametric Wilcoxon Match Pairs Test statistics. Farmer perceptions were analyzed using scoring method. The results of the analysis showed that the proliga field school activities significantly increased participants' knowledge with significance at 5% confidence level and the percentage of participants who increased their knowledge as much as 95.65%. Generally, farmers were interesting on the technology in Proliga but need a technology improvement on TSS to get easier application.
Technical efficiency of cocoa farming in Gorontalo Province
Authors: Abdul Rouf Ari , Retnawati Erna , Rohmadi Dwi , Munawaroh Soimah , Hipi Awaludin
Published: January 2021

Cocoa is an export oriented strategic plantation commodity that contributes to foreign exchange in Indonesia. It is mostly planted in Sulawesi Island, therefore, serves as a source of income for farmers. The purpose of this study was to analyze the efficiency of cocoa farming in Pohuwato Regency, Gorontalo. A total of 55 respondents were selected by simple random sampling. Furthermore, the Cobb Douglas stochastic frontier production function was used to analyze technical production efficiency and factors affecting it. Cocoa farming can be categorized as profitable, as the farmer reached average profit IDR 6,312,679/ha/year. However, in general cocoa farmers have not yet technically efficient because their technical efficiency value was only 0.52. The cocoa production efficiency was positively and significantly affected by land area, fertilizer, pesticides and labor. The increase in farmer age causes a positive and significant rise in inefficiency. Conversely, education and the number of family members have a negative effect, although not significant. Therefore, it requires to increase cocoa farming efficiency by increasing farmers’ access to production inputs such as fertilizers and pesticides, and improving the management of cocoa cultivation.
The Constraints to Sago Development and Improvement Efforts in Siau Tagulandang Biaro (Sitaro) Islands
Authors: Markus Rawung Jefny B. , Indrasti Rita
Published: January 2021

Sago (Metroxylon sago Rottb) is very suitable as a food ingredient because it contains carbohydrates in starch form and high calories. In eastern Indonesia, the sago plant has important social, economic, and ecological roles for most societies because it is also used as a staple food. On the contrary, its development still requires powerful and maximum support. This study aims to describe the diversity of cultivation technology applications and the constraints of sago development. The research was carried out in a plantation area in the Siau Tagulandang Biaro (Sitaro) Islands Regency, North Sulawesi Province, from June to December 2016. The research used a survey method with semi-structured interview techniques on 60 respondents and focus group discussion (FGD) techniques. The research results that have been carried out indicate that farmers have not fully implemented good sago cultivation technology. However, they understand the economic value of this plant. The components of cultivation that were still weak were the weed control aspects and pest and disease control, as well as the post-harvest aspects in terms of sago pith processing techniques.
Study on Adaptation of Soybean under The Coconut
Authors: Polakitan August , N Manoppo Conny
Published: January 2021

Problem is that the sunlight passing through the coconut canopy is limited for photosynthesis. The purpose of this study was to measure the performance of the Anjasmoro variety technology package among coconuts. This research was conducted in North Minahasa in 2018. Field trials to test soybeans under the shade of coconut and without shade. Each treatment was repeated at 15 blocks. Technology Package The technology tested included soybean seeds planted at 15 x 40cm spacing. Basic fertilization is applied 50 kg urea, 75 kg SP36 and 150 KCL / ha. Pest or disease control follows the concept of integrated pest control. The data collected included agronomic performance and yield. The collected data were statistically tested using T (test). The results of the analysis showed that the plant height of 70.6 cm Anjasmoro variety was not significant with soybeans planted on land without shade. But the number of branches (2.1) was significantly lower than the soybean without shade. The number of soybean pods under the shade of 32 pods of coconut was lower and significantly different from the soybean without shade. The soybean yield among the coconuts was 900 kg/ha lower than the soybean without shade, 1,315 kg/ha.
The Strength of Sociopreneurs in Nurturing the Rural Socioeconomic Conditions
Authors: Budi Priatna Wahyu , Santoso Hudi , Moenawar M. Ghozali
Published: January 2021

Maintaining the resilience and community life in rural areas with facing various socioeconomic problems especially the impact of the Covid-19 pandemic make social entrepreneurship is very urgent. Social entrepreneurship sees the problem as an opportunity to form a new business model. The results achieved are not only material benefits, but how the ideas put forward can have a good impact on society at large. In doing so, nurturing the rural socioeconomic problems it requires the presence of socio-preneurs who are able to bridge social needs and current services. This study aims to analyse how the strength of Socio-preneurs in nurturing the rural socioeconomic conditions with community empowerment programs in the fields of education, economics, agriculture and environment which is based on four elements, namely: social value, civil society, innovation, economic activity. The method used in this research is descriptive qualitative through field research. The results show that the strength and capacity of Socio-preneurs are very important because they act as agents of change for the environment, improve systems, find new approaches and create solutions as part of sustainability development goals (SDGs) especially in dealing with the impact of the Covid-19 pandemic for sustainability better life.