bluuebunny/crossref_metadata_2025 huggingface dataset:
A defect in COPI-mediated transport of STING causes immune dysregulation in COPA syndrome
Authors: Deng Zimu , Chong Zhenlu , Law Christopher S. , Mukai Kojiro , Ho Frances O. , Martinu Tereza , Backes Bradley J. , Eckalbar Walter L. , Taguchi Tomohiko , Shum Anthony K.
Published: July 2020

Pathogenic COPA variants cause a Mendelian syndrome of immune dysregulation with elevated type I interferon signaling. COPA is a subunit of coat protein complex I (COPI) that mediates Golgi to ER transport. Missense mutations of the COPA WD40 domain impair binding and sorting of proteins targeted for ER retrieval, but how this causes disease remains unknown. Given the importance of COPA in Golgi–ER transport, we speculated that type I interferon signaling in COPA syndrome involves missorting of STING. We show that a defect in COPI transport causes ligand-independent activation of STING. Furthermore, SURF4 is an adapter molecule that facilitates COPA-mediated retrieval of STING at the Golgi. Activated STING stimulates type I interferon–driven inflammation in CopaE241K/+ mice that is rescued in STING-deficient animals. Our results demonstrate that COPA maintains immune homeostasis by regulating STING transport at the Golgi. In addition, activated STING contributes to immune dysregulation in COPA syndrome and may be a new molecular target in treating the disease.
Generalized V-line transforms in 2D vector tomography
Authors: Ambartsoumian Gaik , Jebelli Mohammad Javad Latifi , Mishra Rohit Kumar
Published: July 2020

We study the inverse problem of recovering a vector field in

R

2

from a set of new generalized V-line transforms in three different ways. First, we introduce the longitudinal and transverse V-line transforms for vector fields in

R

2

. We then give an explicit characterisation of their respective kernels and show that they are complements of each other. We prove invertibility of each transform modulo their kernels and combine them to reconstruct explicitly the full vector field. In the second method, we combine the longitudinal and transverse V-line transforms with their corresponding first moment transforms and recover the full vector field from either pair. We show that the available data in each of these setups can be used to derive the signed V-line transform of both scalar component of the vector field, and use the known inversion of the latter. The final major result of this paper is the derivation of an exact closed form formula for reconstruction of the full vector field in

R

2

from its star transform with weights. We solve this problem by relating the star transform of the vector field to the ordinary Radon transform of the scalar components of the field.
Theoretical insights into photochemical ESITP process for novel DMP-HBT-py compound*
Authors: Yang Guang , Chen Kaifeng , Wang Gang , Yang Dapeng
Published: July 2020

We execute the density functional theory (DFT) and time-dependent density functional theory (TDDFT) approaches to make a detailed exploration about excited state luminescent properties as well as excited state intramolecular proton transfer (ESIPT) mechanism for the novel 2,6-dimethyl phenyl (DMP-HBT-py) system. Firstly, we check and confirm the formation and stabilization of hydrogen bonding interaction for DMP-HBT-py. Via optimized geometrical parameters of primary chemical bond and infrared (IR) spectra, we find O–H⋯N hydrogen bond of DMP-HBT-py should be strengthened in S1 state. Insights into frontier molecular orbitals (MOs) analyses, we infer charge redistribution and charge transfer (ICT) phenomena motivate ESIPT trend. Via probing into potential energy curves (PECs) in related electronic states, we come up with the ultrafast ESIPT behavior due to low potential barrier. Furthermore, we search the reaction transition state (TS) structure, the ultrafast ESIPT behavior and mechanism of DMP-HBT-py compound can be re-confirmed. We sincerely wish this work could play roles in further developing novel applications based on DMP-HBT-py compound and in promoting efficient solid emitters in OLEDs in future.
Movable precision gravimeters based on cold atom interferometry*
Authors: Zhang Jiong-Yang , Chen Le-Le , Cheng Yuan , Luo Qin , Shu Yu-Biao , Duan Xiao-Chun , Zhou Min-Kang , Hu Zhong-Kun
Published: July 2020

High precision atom interferometers have shown attractive prospects in laboratory for testing fundamental physics and inertial sensing. Efforts on applying this innovative technology to field applications are also being made intensively. As the manipulation of cold atoms and related matching technologies mature, inertial sensors based on atom interferometry can be adapted to various indoor or mobile platforms. A series of experiments have been conducted and high performance has been achieved. In this paper, we will introduce the principles, the key technologies, and the applications of atom interferometers, and mainly review the recent progress of movable atom gravimeters.
Synthesis of black phosphorus structured polymeric nitrogen*
Authors: Liu Ying , Su Haipeng , Niu Caoping , Wang Xianlong , Zhang Junran , Ge Zhongxue , Li Yanchun
Published: July 2020

Since the discoveries of polymeric nitrogen, named cg-N (2004), LP-N (2014), HLP-N (2019), another polymorph named black phosphorus nitrogen (BP-N) was synthesized at high-pressure-high-temperature conditions. The narrow existing pressure region and similar synthesized pressure of BP-N compared with cg-N indicate that the stable energy and enthalpy of formation of these two structures are close to each other, which was confirmed by our theoretical calculation. In order to obtain the pressure region of BP-N phase, pure N2 and TiN/Pb + N2 precursors were used for laser-heating high pressure experiments in diamond anvil cell (DAC), and the phase identity was examined by Raman and XRD mapping. BP-N can be synthesized in the pressure range of 130 GPa to 140 GPa with the assistance of heating absorber. With the decrease of the pressure, BP-N can be quenched to ∼ 40 GPa. The synthesizing pressure–temperature and the stable pressure region of BP-N are important for further exploration of BP-N and its kinetic and thermal dynamic relationship with other polymeric nitrogen, especially cg-N.
Direct immune-SCIR public-opinion propagation model based on real-time online users*
Authors: Wang Yun-Ming , Guo Tian-Yi , Li Wei-Dong , Chen Bo
Published: July 2020

Current public-opinion propagation research usually focused on closed network topologies without considering the fluctuation of the number of network users or the impact of social factors on propagation. Thus, it remains difficult to accurately describe the public-opinion propagation rules of social networks. In order to study the rules of public opinion spread on dynamic social networks, by analyzing the activity of social-network users and the regulatory role of relevant departments in the spread of public opinion, concepts of additional user and offline rates are introduced, and the direct immune-susceptible, contacted, infected, and refractory (DI-SCIR) public-opinion propagation model based on real-time online users is established. The interventional force of relevant departments, credibility of real information, and time of intervention are considered, and a public-opinion propagation control strategy based on direct immunity is proposed. The equilibrium point and the basic reproduction number of the model are theoretically analyzed to obtain boundary conditions for public-opinion propagation. Simulation results show that the new model can accurately reflect the propagation rules of public opinion. When the basic reproduction number is less than 1, public opinion will eventually disappear in the network. Social factors can significantly influence the time and scope of public opinion spread on social networks. By controlling social factors, relevant departments can analyze the rules of public opinion spread on social networks to suppress the propagate of negative public opinion and provide a powerful tool to ensure security and stability of society.
Interference properties of a trapped atom interferometer in two asymmetric optical dipole traps*
Authors: Wang Li-Yong , Li Xiao , Wang Kun-Peng , Zhao Yin-Xue , Di Ke , Du Jia-Jia , Hu Jian-Gong
Published: July 2020

We investigate interference properties of a trapped atom interferometer where two symmetric optical dipole traps (ODTs) act as the atomic wave-packets splitter and combiner with internal state labelling. After the preparation of initial superposition states, the atomic wave-packet is adiabatically split and moves into two spatially separate asymmetric ODTs. The atomic wave-packets in two ODTs are then adiabatically recombined after a duration of free evolving in traps, completing the interference cycle of this atom interferometer. We show that the interferogram exhibits a series of periodic revivals in interference visibility. Furthermore, the revival period decreases as the asymmetry of two dipole potentials increases. By introducing an echo sequence to the interferometer, we show that while the echo effect is not influenced by the asymmetry of the two ODTs, the onset of periodic revivals changes by the echo sequence. Our study provides an effective method to cancel or compensate the phase shift caused by position and time correlated force.
Atomic-level characterization of liquid/solid interface
Authors: Hong Jiani , Jiang Ying
Published: July 2020

The detailed understanding of various underlying processes at liquid/solid interfaces requires the development of interface-sensitive and high-resolution experimental techniques with atomic precision. In this perspective, we review the recent advances in studying the liquid/solid interfaces at atomic level by electrochemical scanning tunneling microscope (EC-STM), non-contact atomic force microscopy (NC-AFM), and surface-sensitive vibrational spectroscopies. Different from the ultrahigh vacuum and cryogenic experiments, these techniques are all operated in situ under ambient condition, making the measurements close to the native state of the liquid/solid interface. In the end, we present some perspectives on emerging techniques, which can defeat the limitation of existing imaging and spectroscopic methods in the characterization of liquid/solid interfaces.
Media Based on Technology to Study Spoken Javanese Politeness
Authors: Widiyono Y , Rochimansyah  , Aryanto A , Setyowati H , Saddhono K
Published: July 2020

Being able to speak using unggah-ungguh basa (speech levels) is one of the indicators of students’ speaking skill in Javanese language. The use of IT-based teaching media can be an alternative way to develop students’ speaking skill and stimulate students’ creativity, innovation, and thinking skills as well. This was a quasi experiment carried out at Senior High School in Purworejo, Central Java, Indonesia. The finding wasthe average score of the control group was 74.5 and that of the experimental group was 82.2. T-test showed that ttable was 4.87 and tcount was 2.000. The research confirms that IT-based teaching media are effective to teach Javanese speaking skill using unggah-ungguh basa(speech levels).
Development of Job Sheet Lathe Machining Practice Based on Animation Video as Interactive Learning Media
Authors: Ratnawati Dianna , Mustafa Kusuma Wahyu , Setuju Setuju , Nurtanto Muhammad , Widodo Widodo
Published: July 2020

The weakness of paper-based job sheet is that it is less effective in facilitating students’ understanding of the explanation of images, and tends not to be stored by students for a long period of time as learning reference material so that it requires the development of job sheets to become interactive learning media that are in line with the demands of the development of the 4.0 industrial revolution. The objectives of this study are (1) to produce a job sheet for the practice of animation video-based lathe machining that can be accessed on Android SMK students, and (2) test the level of feasibility of the results of the development of animated video-based job sheets. This research method is Research and Development (R&D) with a 4-D model consisting of four stages, namely define, design, develop, and disseminate. The subject of the study consisted of material experts, media experts, and students of class XI machining techniques at Muhammadiyah Vocational School Prambanan. The instrument used was a questionnaire. While the data analysis technique uses quantitative descriptive analysis. The applications used in developing this job sheet include SSCNC (Swansoft CNC Simulator), bandicam, and wondershare filmora. The results of this study include: (1) producing a job sheet for video-based lathe machining practice with one subject of flat lathe work preparation; (2) the level of feasibility of animated videos is very feasible, it is known from the results of material expert validation which includes aspects of content, language, presentation, and benefits reaching an average value of 71.50 with a percentage of 89.50% in the very feasible category. The results of media expert validation covering aspects of appearance, ease of use, consistency, format, and graphics reached a value of 73 with a percentage of 91% in the very feasible category. The results of the small class test which included material aspects, language, graphics, and benefits obtained an average score of 62.31 with a percentage of 86% in the very feasible category and the results of the large class test obtained an average score of 59.55 with a percentage of 83% in the very feasible category.
Problem Based Learning (PBL) in Industry 4.0: Improving Learning Quality through Character-Based Literacy Learning and Life Career Skill (LL-LCS)
Authors: Nurtanto Muhammad , Fawaid Moh , Sofyan Herminarto
Published: July 2020

The rapid flow of globalization should be absorbed and implemented in education, especially learning. The industry 4.0 era and millennial, 21st Century Education, and Sustainable Development Goals are intended for the purpose of learning and innovation skills. The researchers’ objective is to improve the quality of learning by applying the literacy movement, character values as a provision for life and career skills using the PBL method in the gasoline engine curriculum. Research method is classroom action research with the Elliot action model carried out in two cycles. A total of 34 students with ages ± 19-22 were used as research samples. The results obtained during the study showed an increase, namely: (a) the literacy movement was observed as successfully implemented with an increase of 19.1%; (b) inducing character values improves student behavior by 14.8%; and (c) strengthening competency in the gasoline motorbike curriculum by 11.3%. Problems in the engineering field that are packaged in PBL classes through student literacy and character movements are some forms of learning innovation that need to be applied to similar competencies.
A Concepts of Factor Land Value on Ahmad Yani Frontage Road, Surabaya
Authors: Tampubolon Y,K. , Utomo C.
Published: July 2020

The Surabaya City has a rapid infrastructure development as proven by the increasing value of land. One of the infrastructure developments is the construction of Ahmad Yani’s Frontage Road. The value of land in Frontage Ahmad Yani continues to increase due to various factors. The purpose of this study analyzes what variables affect land value by using a descriptive analysis method based on journals and previous research. The results of this study uncovered four dominant variables that influence land values, namely location, land characteristics, externalities, and accessibility.
Index Risk of Sanitation (IRS) Modeling to Determine Domestic Waste Water System
Authors: Rooslan Edy Santosa Florianus , Dwi Atmoko Arief , Arifin Bustomi
Published: July 2020

Indonesian government through National Medium Development Term Plan (2015-2019) aims 100% easy access of clean and fresh drink water, and 100% decent access of sanitation. The present study aims to determine index risk of sanitation modeling (IRS) of domestic waste water as an effort in achieving the target of Universal Access 2020. Discriminants that resulted from the present study are: Z1 = -41.86 - (1,16*IRS) + (0,07*PM) + (0,16*PP) + (0,11*PWM) dan Z2 = 6.74 + (1,54*IRS) + (0,01*PM) + (0,21*PP) - (0,26*PWM) in which it is used to determine domestic waste water system. Variables that influence this system are index risk of sanitation (IRS), female participant (PP), poor people (PWM), and beneficiary (PM). When the equation mentioned above is applied into 154 districts in Surabaya, the result will be as follow: 1) Based on Domestic Waste Water System there are 57 districts (37,01%) that can be included into communal system, 31 (20,13%) districts are included into domestic IPAL system and 66 districts (42,86%) are included into combination between communal and IPAL system.
Review of Environmental Health Risk Assessment (EHRA) to Achieve the Target of Universal Access 2020 Focusing on Domestic Waste Water Sector
Authors: Rooslan Edy Santosa Florianus , Gede Arimbawa I , Durrotun Nasihien Ronny , Arifin Bustomi , Damayanti Elok
Published: July 2020

Development of urban city is commonly followed by steady growth of economic condition, population density, and negative impact of environmental condition. Reduction quality of environmental condition stimulates the occurrence of environmental degradation within society. Low quality of waste water system, management of garbage, limitation of green areas, and low concern of society toward climate change are example of environmental issues that need to be solved by the government as soon as possible. The succession in achieving aims of Millennium Development Goals (MDGs) is continued by Sustainable Development Goals (SDGs) program from 2015 to 2030. SDGs have numerous action plans in achieving its goals for instance Environmental Health Risk Assessment (EHRA) for waste water system in Blitar. Research methods that use in the present study are as follow (i) Field study named Environmental Health Risk Assessment (EHRA), and (ii) data collection, entry data, data cleaning, data processing and data analysis. The present study concludes numerous results achievement for waste water access are follow : very high (180 districts or 72,58 %), high (26 districts or 10.48 %), medium (28 districts or 11,29 %), low (14 districts or 5,65 %). It can be concluded that the achievement for SDGs for waste water system has been achieved. more actively in investments or asset sharing of airports in the region.
Optimization and improvement of port facilities for marine pilot activities in Container Terminal Port 2 of Tanjung Priok Jakarta
Authors: Nalif K A , Karsafman T , Nugraha B
Published: July 2020

Tanjung Priok Port is a compulsory pilotage area, where all commercial ships that will enter, leaving and moving within Tanjung Priok Port should be assisted by harbour pilot. Pilot service is one of the ports services given to support and facilitate the activities of the traffic flow of transport ocean freight to ships that perform the movement in the Container Terminal 2 (UTPK) Tanjung Priok, Jakarta. The purpose of this study is to know the existing condition of pilot service and providing the fix strategy. The methods use in this research is qualitative methods, with primary data derived from interviews the informant, observation, 3 (three) months movement report in container terminal 2, Tanjung Priok and other official documents. This research concluded in order to increase the institutionl capacity of pilotage by optimizing pilotage and improve port facilities for harbour pilot.
Optimization Enterprise Resource Planning (ERP) system on the control flow of material in Kalijapat Warehouse
Authors: Neviansyah Putra Muhammad , Nurhakim Mizan , Rifni Muhammad , Himawan Doddy
Published: July 2020

The warehouse is an area that has a function to store materials or production goods within a certain period which will then be distributed to the destination location. By implementing ERP (Enterprise Resource Planning) System can accelerate the control of material flow in the warehouse, reduce human error & can get data following the data in the field. However, the implementation of ERP (Enterprise Resource Planning) is also not easy and of course requires maximum preparation and techniques that must be perfect, so that the results are as desired. Therefore, in this study, we discussed the optimization of the ERP (Enterprise Resource Planning) System in controlling the flow of material in the Kalijapat Warehouse. This research was conducted using qualitative methods because it would explain in detail the process of controlling material flow during the implementation of an ERP (Enterprise Resource Planning) System in controlling the flow of material in the kalijapat warehouse.
Delivery Order (DO) Online Implementation In Accelerating Document Flow Service Of Imported Goods In Payment Companies
Authors: Sultra R.A.P.J. , Nabela R. M. C. , Wibisono G , Sirait D. P.
Published: July 2020

Delivery Order (DO) Online is a delivery order redeemer from shipping lines by the freight forwarders electronically. It is an electronic order delivery service to speed up the service of imported goods expenditure from a port so that the flow of documents and the flow of goods is efficient. The purpose of this research is to explain Delivery Order Online and the obstacles of Delivery Order Online in Shipping Companies. The research method used was qualitative descriptive research. Sources of data in this study were primary data by conducting interviews with related parties and secondary data by data collection from the research site. The results of the study showed that the implementation of DO Online has a positive impact on service users, that is, it can speed up the flow of documents and the flow of imported goods in the ports and have some obstacles in shipping companies.
The Implementation of Delivery Order Online as an Effort of Operational Efficiency
Authors: Syntia Gintha , Fahira Jihan , Himawan Doddy , Keke Yulianti
Published: July 2020

The development of the world of technology is now rapidly entering various fields. Information Technology (IT) has become a major factor and is widespread in various sectors. Information Technology (IT) is a driver of utilization in all aspects so that more and more companies are trying to improve their business, especially in the field of goods transportation services that are closely related to information technology (IT). However, some companies still carry out their business activities manually, as in handling Delivery Orders (DO). This causes high operational costs for the company. The DO Online system is present to facilitate companies in handling Delivery Order documents in import activities. After implementing DO Online, the transfer of documents becomes faster, the process of dispensing goods at the terminal becomes faster, in terms of security because it is easily monitored by the company and can minimize errors that arise in processing Delivery Order data, this can play a role in the company’s operational efficiency. This research was conducted using a qualitative approach because it will explain clearly and deeply the activities that have been carried out. In this study, we will discuss the implementation of Delivery Order Online as an effort for the operational efficiency of the company. The answers to this paper are obtained by analyzing data from Freight Forwarding companies and terminal companies for loading and unloading goods that have implemented an Online Delivery Order system. The results of this study are expected to be a consideration for implementing import activities.
Analysis Of The Potential For Cbl Inland Waterways As An Alternative Transport Logistics Using AHP
Authors: Wahyu Nur Pradana Bagas , Thareq Abdul Fattah Muammar , Didiet Rachmat Hidayat Raden , Himawan Triyasa Doddy , Yuliantini
Published: July 2020

Economic growth in Indonesia gives effect to the development of the logistics industry in Indonesia. Logistics Business is a sector that has a fairly high growth rate, where increasingly improved growth requires effective and efficient logistical support. In 2018, the Government of West Java implement the Innovation Inland Waterways which aims to create a channel width of the sea into the mainland so that containers can be transported by water rather than through the toll-road to Tanjung Priok, and make Inland Waterways as an Alternative Transportation logistics, Central Government, also has made Inland Waterways Cikarang Bekasi Laut (CBL) as the National Strategic Projects, which is expected to reduce the current density on the land logistics from Cikarang Industrial Area to the Port of Tanjung Priok and aim to optimize the potential of the river as an alternative canal path of transport logistics. Where the volume of land transport logistics in Indonesia has reached nearly 90%, and with the construction of CBL Inland Waterways is expected to reduce costs with the integration of multimodal transport logistics. The purpose of this study was to find a potential that can be developed as Alternative Transportation Logistics and determines the priority level of that potential. Retrieval of data taken through a questionnaire distributed to experts in the field of logistics and related to the research being carried out. The result indicated that the Economic aspect was the top priority among the other potential to developed.
Utilization Visibility Order Management In Trucking Module Orchestration
Authors: Hafiz R T , Rambe V A , Triyasa D H , Rifni M
Published: July 2020

The Transport Module can help you track your vehicle and its distance so that you have less administration, optimized driving, and better customer service. Are you familiar with the problem of tracking your vehicle and its existence? This problem often occurs, when you want to notify customers about the time of arrival or inaccurate information about means of transportation. Not only that, but there are also problems that can be found, such as the difficulty in knowing the condition of the goods being transported. Using truck modules can provide convenience such as faster response times on assignments, you can also easily help your customers when they request arrival time or shipping status. The purpose of ordering orders is to be able to quickly and easily enter the origin and destination needed, delivery, and details of the pickup and delivery with several possible clicks. This study aims to look for optimization of the performance of trucking company performance and analyze and provide information regarding the position of an item in real-time. This paper describes the Utility Management of Utility Visibility in the Trucking Orchestration Module.
An assessment of vortex detection criteria for 2C-2D PIV data
Authors: De Gregorio F , Visingardi A , Coletta M , Iuso G
Published: July 2020

The aim of the article is to propose a robust and reliable engineering method for identifying and characterizing vortical structures within a flow field measured with a classic two-component PIV measurement system. Some of the most popular vortex-detection criteria are briefly presented for comparison purposes. Many of these fail if spurious vectors are present within the flow field due to poor PIV image quality. The proposed method was tested both on synthetic images of ideal vortices, having different spatial resolutions and different noise levels in order to perform a parametric assessment, and on real PIV images of a four-bladed rotor wake.
Suction system vapour velocity map estimation through SIFT-based alghoritm
Authors: Tocci T. , Capponi L. , Marsili R. , Rossi G. , Pirisinu J.
Published: July 2020

Measurement of velocity fields is a fundamental topic in fluid dynamics. Image-based analysis methods such as Particle Image Velocimetry or Laser Doppler Velocimetry are usually used. However, these techniques need complex instrumentation and particular test conditions. In this work, a computer vision-based approach is developed in order to obtain vapour velocity field map in effective, robust and economic way. Moreover, iterative filtering algorithm is applied to improve the results. The implemented method is tested on a suction system for domestic use, and the obtained velocity maps are validated by hot-wire anemometry, leading to totally comparable results, both in terms of profile and mean velocity. Uncertainty analysis shows acceptable results, considering the random nature of the phenomenon.
Wavelet intermittent blowout detection in thermoacoustic instability of trapped vortex combustor
Authors: Pagliaroli Tiziano , Troiaini Guido
Published: July 2020

This paper is aimed to the study of spontaneous radiant energy emitted by trapped vortex flame, focusing on the intermittent occurrence of flame blowout during thermoacoustic oscillation. We tackle this issue by a wavelet–based auto–conditioning technique, able to detect intermittent structures in the radiant energy signal, which we identify as a trace of extinction–reignition events. Intermittent events are found to be in phase with the tonal component of the radiant energy signal, although they occur randomly in time. Despite the wavelet auto–conditioning technique is a well established method in fluid dynamics and aeroacoustics, our work represents the first application in combustion field.

Additional information about blow–out are inferred by analysing the average signature computed from the radiant power time series: re–ignition velocity appears higher than extinction velocity. This result confirms the effectiveness of the radiant power for combustion diagnostics.
Experimental study of a vertical plunging jet by means of a volumetric shadowgraph technique
Authors: Di Nunno F , Alves Pereira F , Miozzi M , Granata F , Gargano R , de Marinis G , Di Felice F
Published: July 2020

A vertical plunging jet has been investigated experimentally by means of an innovative volumetric shadowgraphy technique. A space carving algorithm has been used for the measurement of the size and concentration of the air bubbles, to follow the air bubbles path inside the investigated volume, providing both spatial and temporal evolution of the same. Furthermore, the air bubble tracking has been performed by means of an algorithm based on the Lucas-Kanade optical flow algorithm. Results highlighted a distribution of the air bubbles that follows the free jet spread inside the investigated volume with a dependence of speed and size from the action exerted by the vertical jet. The volumetric shadowgraph technique has proven effective in characterizing air bubbles, also in presence of relevant void fraction.
Experimental Analysis of Small-Scale Rotors with Serrated Trailing Edge for Quiet Drone Propulsion
Authors: Candeloro Paolo , Emanuele Nargi Ranieri , Patané Fabrizio , Pagliaroli Tiziano
Published: July 2020

Drones are a growing business in Europe, delivering services in all environments, including urban areas: delivery of goods and e–commerce, precision agriculture, mapping, infrastructure inspections. In order to allow the integration of this platform in urban areas and to obtain public acceptance, it is necessary to significantly reduce the noise produced by the propellers. Currently, the level of noise generated by propellers is too relevant in terms of annoying effects induced on living beings. In particular, low altitude flights have been found to disturb citizens and frighten animals. With the aim to tackle such an issue, this paper describes an experimental parametric analysis of a passive noise control technique to reduce the signature generated by small–scale propeller employed for mini unmanned aerial propulsion.

The noise control strategy here proposed is based on a serration pattern realized at the trailing edge (TE) of the blade. Despite the same approach has already been successfully employed to mitigate noise generated by wind turbines and fixed wing aircraft, few studies have been devoted to investigate the effects of a serration pattern on small propellers. A large number of different serration were realized by varying height, width and teeth distribution. The idea is to find the optimal serration geometry in terms of acoustic requirements and to highlight the role of teeth number.

Results shows a sensible reduction in the noise propeller signature. Serration effects seems to depend strongly from the polar angle identifying different region of operation. Spectral Analysis points out that the serration affect the low frequency region and even the tonal component of aerodynamic noise. Statistical analysis shows a departure from a gaussian distribution and an effect of damping on distribution tails.
Remote and optical monitoring techniques applied to the maritime sector
Authors: Boselli A , de Marco C , Mocerino L , Murena F , Quaranta F , Rizzuto E , Sannino A , Spinelli N
Published: July 2020

A rising global attention to the environmental impact of anthropogenic activities pushes towards a continuous reduction of such impact and a control, through monitoring techniques, of the main sources of pollution. The transport sector is involved, as all other field of anthropogenic activities in the efforts towards a drastic abatement of emissions. Shipping activities generate greenhouse effect gases (GHGs), affecting the environment on a global scale, and other pollutants harmful for human health and the ecosystem on a local scale. These latter aspects are particularly relevant in ports where berths are close to densely inhabited areas. Many efforts have been and will be spent to predict and quantify these emissions with the aim of controlling them but direct measurements aimed at the identification and quantification of particularly polluting substances are to be considered a key point to achieve an effective control of emissions. In the context of ports, as in any transportation infrastructure, an identification of polluting vehicles and a quantification in an objective way of their emissions is crucial to implement any control activity of the polluting emissions. The development of optical remote sensing techniques appears to be particularly promising. This work provides a state of the art of the main techniques based on optical sensors (LIDAR, LIDAR DIAL, DOAS, camera UV) possibly applied in the maritime sector, highlighting advantages and potentialities. Results of a preliminary measurement campaign are reported to show the first encouraging feedback for the feasibility of the application.
Infrared Imaging in Internal Combustion Engines: Advanced Techniques for Vapor Phase Visualization and CO2 Detection
Authors: Mancaruso E. , Sequino L. , Vaglieco B. M.
Published: July 2020

As the technical level of modern engines increases to fulfill the emissions requirements, the techniques used to investigate in-cylinder phenomena need to update and to improve. Optical diagnostics provide precious information about the injection and combustion processes. To visualize the fuel vapor phase, a light source with specific wavelength and energy is needed; multiple optical accesses and additional optical components are required; the techniques are susceptible to the directionality of the light source and to the fuel composition. Recently, Infrared imaging has been used to overcome some of the drawbacks of well-known optical techniques. A peculiarity of infrared imaging is the ability to detect the energy emitted by a body as electromagnetic waves, from 0.76 to 1000 μm wavelength. This work illustrates the application of infrared imaging in a compression ignition engine for the analysis of the injection and combustion processes. The diesel fuel vapor penetration is experimentally measured and then compared to a 1d model of spray injection. Another application of IR can be the evaluation of the CO2 in the cylinder, that is a key species in the combustion process, the wavelength of 4.2 μm, relative to the asymmetric stretch of this molecule, is investigated to follow its distribution within the cylinder for different, conventional and non-conventional combustion modes.
Contaminant removal efficiency of floating treatment wetlands
Authors: Li Shuolin , Katul Gabriel
Published: July 2020

Floating treatment wetlands are new ecological infrastructures for stormwater treatment. Despite a recent proliferation in their usage, their contaminant removal efficiency e continues to draw research attention. Here, the e from idealized FTWs is numerically computed across a wide range of flow and geometric conditions while accommodating joint contributions of advection, turbulent dispersion, and vegetation removal. The emerging mathematical structure describing e bears resemblance to a simplified plug flow model and supports an empirical shallow-basin model from long-term field measurements. The present model indicates that e remains significantly influenced by a Dämkohler number that quantifies the effects of both vegetation and flow properties. The impacts on e of the underflow region and contaminant blockage on the removal mechanisms are also investigated.
Shades of green: life cycle assessment of renewable energy projects financed through green bonds
Authors: Gibon Thomas , Popescu Ioana-Ştefania , Hitaj Claudia , Petucco Claudio , Benetto Enrico
Published: July 2020

Green bonds have emerged as a key instrument to fund projects contributing to climate change mitigation or environmental protection. However, a consistent, robust and comparable standard for the estimation of the environmental impacts of green bonds is lacking, hampering growth in sustainable finance. As encouraged by second-party opinion reports, the use of life cycle assessment (LCA) allows for the complete environmental evaluation of projects over their life cycle. Here we estimate the LCA-based impacts along several environmental metrics of a set of green bonds for renewable power plants issued by the European Investment Bank from 2015–2018. Life cycle avoided greenhouse gas (GHG) emissions varied by a factor of 12 from 29 to 359 t CO2 eq./M€ invested—information that is not available to investors at the outset, indicating that funds are unlikely to be allocated efficiently. Furthermore, linking environmental impact indicators to the Sustainable Development Goals unveils significant trade-offs. Bonds may perform well on water use and emissions, while having a negative impact on waste and land use. Conducting LCA of green bonds comes at a cost of additional methodological challenges and increased data needs compared with current reporting practices. However, the ready infrastructure of LCA databases and methodologies can provide the necessary tools to meet future reporting requirements as the EU taxonomy framework and standardization of impact reporting evolve.
Performance for the catalytic CO oxidation over the Mo0.5Sn9Co90.5O2 catalyst
Authors: Lu Danting , Fan Xing , Cai Jianyu , Li Jian
Published: July 2020

In this study, carbon monoxide catalytic oxidant MoSnCoOx was prepared by coprecipitating method to investigate the effect of MoO3 addition amount on catalyst activity. Meanwhile, the sulfur and water resistance of the catalysts were researched by simulating the industrial conditions of sintering smoke emission. The samples were studied using BET, XRD, SEM and H2-TPR techniques. The results revealed that catalyst added with 0.5% MoO3 had better activity than the original Sn9Co91O2 catalyst and its efficiency reached 98.04% at 70 °C. After 21 h reaction with sulfur and water in the flue gas, the catalyst efficiency only decreased to 89.75%. According to the results of characterization, Mo0.5Sn9Co90.5O2 catalyst could better resist sulfur and water, because the presence of MoO3 not only reduced the crystallinity of the catalyst, but it also increases the specific surface area and oxidation capacity.
Experimental Studies of Performance Savonius Wind Turbine with Variation Layered Multiple Blade
Authors: Kurniawan Y , Tjahjana D D D P , Santoso B
Published: July 2020

The solution to various environmental problems now is the development of renewable energy. One of the renewable energy that was sociable to the environment and easily obtained is wind energy. Savonius wind turbines are proper to be applied in Indonesia which have low wind speeds, besides that Savonius also has many advantages over other wind turbines. In this paper experimental study is done a study on conventional Savonius wind turbine and modified Savonius wind turbine by added multiple layer 90°, 115°, 135° at positions 0° and 30°. The schematic supportive testing is done by blower fan. The wind speed used in testing with a range of 4.99 m/s to 7.27 m/s. The test results showed that the addition of multiple layers could be increased Savonius’s power coefficient to 17.6%. The maximum power coefficient obtained by Savonius turbine was 0.120 with variations multiple layer 90° at 0° position. So, the addition of multiple layer can be improved the performance of the Savonius wind turbine
Assessment of Sedimentation Problem in Kenyir Hydropower Reservoir
Authors: Chow M.F. , Subbramaniam P. , Sidek L.M.
Published: July 2020

Sedimentation issue is becoming an emerging challenge in hydropower dam due to land use changes and frequent heavy storm in the recent decades. This study carried out an assessment on sedimentation problem in Kenyir hydropower reservoir in Malaysia based on hydrological, land use, topographic, soil erosion and dam capacity data. The results showed that the average live storage for Kenyir reservoir could be sustained at least for another 6774 years while dead storage can survive more than 5675 years. The number of year required for Kenyir reservoir to be fully deposited with sediment will be shorten to 3784 years for dead storage if 50% reduction in forest coverage. A more comprehensive monitoring program is recommended to be implemented in Kenyir reservoir catchment so that the results can be used confidently in future flow and sediment load predictions.
Analysis of Correlation between Channel Sediment Nutrition and Aquatic Plant Biomass in Pishihang Irrigation District
Authors: Zhang Yongsheng , Li Haiying , Fan Ruina , Li Zhan , Hong Zhong
Published: July 2020

To study sediment dredging in Pishihang Irrigation District, the largest irrigation district in China, this paper collected aquatic plants and sediment in the channel to analyze the biomass and nutrient distribution. The results were as follows: in April, the biomass at Point 3 peaked at 21.9 kg/m2 while in July and September, the biomass at Point 4 was the highest at the level of 25.1 kg/m2 and 25.6 kg/m2 respectively. The nutrient factor in sediment at Point 4 and 5 was higher than those at other points. The correlation coefficients of aquatic plant biomass with ammonia nitrogen and nitrate nitrogen were 0.81, 0.65 and 0.51 respectively. The nutrients in the sediment affecting the growth of aquatic plants mainly consisted of ammonia nitrogen, nitrate nitrogen and inorganic phosphorus. The eco-dredging project in the canal of Pishihang Irrigation District for weeding was about 20-30cm in thickness.
Application of High Modulus Silica Sol Electrolyte in Lead-acid Battery
Authors: Yang Tong , Qian Shengqiang , Wang Zhenwei
Published: July 2020

High modulus silica sol of n/m=52 sodium silicate aqueous sol was prepared by compressing and filtering sodium silicate aqueous solution without loss of SiO2 content. The SiO2 content can increase from 14.2% to 30%. The high modulus silica sol are mixed with acidic water to prepare a high modulus silica sol electrolyte, which is then produced into 6-DZM-20 Ah electric bicycle batteries. A combination of intermittent current-changing charging process, simple electrolyte production process, brings about reduced energy consumption and cost. The battery with the high modulus silica sol electrolyte shows enhanced stability, deep cycling performance, long service life, strong resistance to harsh environments, low self-discharge rate, low floating current, and excellent heat resistance.
Influence of Different Media and Conditions on Probiotics Isolation from Breast Milk
Authors: Wu Yifan , Zhang Lanwei , Chen Shiwei , Han Xue
Published: July 2020

Breast milk is an important food source for infant development and a viable potential probiotics resource for formula and fermentation industry. However, how to enrich the bacteria in human milk at the bacterial level in different media under different conditions is still poorly understood. Our research tested the isolating capability of LBS media, MRS media and MRS (pH=5.2) media under both anaerobic and aerobic conditions via Gram staining and 16s rRNA sequencing for Lactobacillus and Bifidobacterium. As a conclusion, MRS (pH=5.2) media showed a good capability on Lactobacillus isolation while LBS media presented well on Bifidobacterium isolation under anaerobic conditions.
Evaluating the feasibility of GF-1 remote sensing comparison with hyperspectral data for soil organic carbon prediction and mapping
Authors: Guo Yan , He Jia , Li Shimin , Zheng Guoqing , Wang Laigang
Published: July 2020

High-resolution remote sensing data play a very important role in agriculture. However, the major sources of high-resolution images are not owned by China. The Chinese “High Resolution Earth Observation Systems” was deployed in 2010, and several major projects have been implemented. The present study focused on assessing the feasibility of Gaofen (GF) multi-spectral data for monitoring bare soil organic carbon (SOC) at field and regional scales. The data sources are hyperspectra measured under laboratory conditions and simulated multi-spectral data from GF-1 remote sensing images. Partial least squares regression (PLSR) was used to estimate SOC. At the field scale, the SOC hyperspectral prediction model produced better R2=0.9688, RMSE=0.3818, and RPD=5.6393 than the simulated multi-spectral SOC prediction model (R2=0.8179, RMSE=0.9913, RPD=2.3401). At a regional scale, the SOC hyperspectral prediction model also produced a better R2=0.9319, RMSE=1.097, and RPD=3.8758 than the simulated multi-spectral SOC predicted model (R2=0.8445, RMSE=1.6574, RPD=2.4228). For the simulated GF-1 multi-spectra model, regional scale predications had advantages over field scale predictions. The spatial distribution characteristics of SOC measurements and predictions from hyperspectral data and simulated GF-1 multi-spectral data were similar. Thus, satisfactory performance of the predictive and calibrated models validates the feasibility of these methods for rapid large-scale SOC monitoring.
Study on the Risk Early Warning Index System of Typical Chemical Production Process Based on Three Dimensional Factors
Authors: hui Che , xinyue Ma , xiaoyu Lu
Published: July 2020

Prevention and control in advance embodies the essence of risk management, and risk early warning index system is the key link of implementing risk early warning. In order to construct risk early warning index system of typical chemical production process, the risk identification, analysis and early warning theory are closely combined in this paper, the accident risk factors are extended to three aspects, as possibility, severity and sensitivity. Based on the common accidents of typical chemical production process, the risk factors of the production process are comprehensively analysed and the risk early warning index system is put forward based on three dimensional factors. Through the index screening methods for interval estimation, the primary warning indicators are screened. Finally, the risk early warning index system of typical chemical production process is determined.