Port Supply Research Articles

Combustion characteristics on ammonia injection velocity and positions for ammonia co-firing with coal in a pilot-scale circulating fluidized bed combustor

Ammonia (NH3) co-firing with coal in thermal power plant offers a viable solution for reducing CO2 emissions. Optimizing the NH3 injection method is crucial to achieving comparable performance and pollutant emissions in NH3–coal co-firing compared to coal only combustion in a circulating fluidized bed combustion system. The impact of NH3 co-firing with coal on the injection velocity and location in related to the NH3 supply method was evaluated. Injection velocity was controlled by varying the number of ammonia supply ports and their heights (0.2 m and 1.8 m from the distributor). Injecting NH3 through one port at a high velocity of 2.4 m/s increases CO emissions while decreasing NO emissions due to the formation of a reducing environment. Conversely, utilizing two ports with low NH3 injection velocity of 1.2 m/s exhibited the opposite trend in CO and NO emissions, achieving the highest combustion efficiency without the formation of N-containing components. This injection velocity promotes better mixing of gases (air and NH3) and solids (bed materials and coal) without hindering coal combustion. Regarding greenhouse gases emissions, the part of CO2 emissions decreased by considering CO2 concentration and flue gas flow rate, while the part of N2O emissions significantly increased due to N-chemistry by > 5 times.

Reshaping of Global Shipping Dynamics: Implications for Strategic Resilience Capabilities, Marketing Capabilities, Supply Chain Orientation Capabilities and Port Competitiveness in Indonesia

The phenomenon of dynamic maritime environment have affected port business and it is substantially changing the business environment in which large-scale container trade growth is being facilitated. In this paper will illustrate the dynamic features of port users, discuss the port competition strategy and analyse the marketing strategic for port business under transformation phases. Using qualitative methods using case studies through a literature review and empirical evidence to prove, deepen and expand the results of the study. In this article, we develop and examine the implication such marketing capabilities approach to the effectiveness of the marketing strategies and strategic resilience capabilities to determine sustainable competitive performance. Based on a discussion among with its managements, this paper could prove a conceptual framework in which strategic resilience capabilities and supply chain orientation capabilities have a profound impact on the company’s sustainable competitive performance.

Wideband 2×2 antenna-in-package based on magneto-electric dipole array antenna for 5G mmWave applications

This paper presents an antenna-in-package (AiP) design realised with the conventional multi-layer printed circuit board manufacturing method. The design consists of a wideband 2×2 magneto-electric dipole array antenna operating from 24.25−29.5 GHz and a wideband transition from the analogue beamformer integrated into the proposed MED array antenna (IMED). The IMED array antenna has been fabricated with two distinct NXP analogue beamformer chips, i.e., MMW 9004 KC and MMW 9002 KC covering the N257 and the N258 band, respectively. The measured effective isotropic radiated power at P1dB was 35.3 dBm and 35.1 dBm for the IMED with the MMW 9004 KC and the MMW 9002 KC analogue beamformer chip, respectively. Our proposed antenna demonstrates the feasibility of designing a single wideband AiP that can be integrated with different analogue beamformers operating within the frequency band of the proposed antenna. This is true, provided the RFIC used for integration has the same footprint for RF ports, serial peripheral interface control ports, and DC power supply ports. The primary benefit of the proposed technique is the design antenna can adapt the operating frequency to different frequency standards by incorporating additional analogue chips without increasing the design complexity. This feature enables the antenna manufacturer to tailor the antenna products to different frequency standardisations depending on where the antenna will be employed. The AiP operates at 5G millimeter-wave (mmWave) frequencies, with the potential for Internet of Things applications. Furthermore, from our simulation results, the proposed IMED can potentially be extended as a phased array antenna with 2D scanning.

REMOTE VEHICLE DIAGNOSTIC SYSTEM DEVELOPMENT BASED ON THE INTERNET OF THINGS TECHNOLOGY

Background. Advanced artificial intelligence and IoT gateways are working together in the automotive industry to predict potential vehicle problems by analysing sensor data and optimizing quality control processes. Manufacturers can detect anomalies, improve product reliability, and eliminate manufacturing defects or malfunctions in advance. Predictive analytics also lead to improved fuel efficiency, performance and overall vehicle reliability. Objective. The purpose of this work is to develop a model for remote diagnosis of vehicle faults using a Raspberry Pi model B microcomputer and a SIM7600G-H GSM module. Configure data modules, install the necessary software and configure it, demonstrate step-by-step actions, and perform diagnostics and testing of this module for data transmission. Methods. A prototype was created on the basis of Raspberry Pi 4. and provides monitoring of machine operation in remote mode using the SIM7600E-H LTE Cat-4 4G/3G module. The design has small dimensions, easy installation, requires only initial adjustment and has a wide range of improvements. Results. This prototype uses a diagnostic OBD-II car scanner ELM327 with Bluetooth connection support, a Raspberry PI 4 model B microcomputer with 8 GB of RAM, 4 USB connectors (2 ports type USB3 and 2 ports type USB2), a Gigabit Ethernet port, a USB-C power supply port, and two micro HDMI 4K display connectors. On top of the module there are 48 pins (contacts) with which you can connect modules of different types and directions. The SIM7600G-H communication module is connected to these pins. The last element of the prototype is the SIM card of one of the telephone service providers and the micro SD card, which will act as the main memory element on which the operating system will be written and data will be stored. Conclusions. The article proposes the development of a device model using Internet of Things technologies, which is capable of providing remote diagnosis of car malfunctions. This model is based on the use of the SIM7600G-H module, which provides data transmission through the mobile network. The developed model allows you to read data from various car sensors, as well as transfer this data to a remote device for further analysis. This makes it possible to quickly detect malfunctions and make timely decisions on their correction.

Solar Based Multilevel Inverter f o r BLDC Motor Drive

The BLDC motor is widely utilized in high power and low voltage applications because to its simple construction, great efficiency, low maintenance requirements, and low cost .Furthermore, considering their size, they have a lot of torque and power output. The BLDC motor is powered by an alternating current source and is operated straight from the AC supply port, despite being a DC motor in this case. The main drawback is that any disruptions in the source will have an impact on the applications that use BLDC motors in the industrial context. So, to avoid this, there should be a converter and an inverter intermediary between the motor and the source. One of three methods can be used to drive the BLDC motor. 1. Two-level inverters based on pulse width modulation (PWM). 2. An multiple-level working inverter. 3. A multilevel inverter with neutral clamping. Using a multicarrier PWM technique, the suggested inverter may lower the output signal's harmonic content. It is capable of generating very good motor currents. In this instance, a three-level diode clamped multilevel inverter can be used to accurately control the speed of a BLDC. This study's primary goal is to demonstrate how to run a BLDC drive with an inverter to lower harmonics. A diode clamped multi-level inverter is a device that converts voltage to current. An improved version of this strategy is provided by this research. Using the MATLAB Simulink software tool, one can assess the system's overall effectiveness by simulating the neutral clamp multilevel inverter-based drive system's functioning. In the event of a power outage, the entire application will cease to function and generate output. Under order to increase the output and supply reliability of power, renewable energies must be used under these circumstances. There are many renewable energy sources available; however solar photovoltaic systems are the better option because of their benefits over traditional power sources. A diode clamped multi-level inverter was used. A diode clamped multi-level inverter was used to drive the BLDC.

Leveraging Blockchain for Maritime Port Supply Chain Management through Multicriteria Decision Making

This research investigates the optimal integration of Blockchain Technology (BT) in Supply Chain Management (SCM) within Chile’s maritime ports. Utilizing fuzzy Logarithmic Methodology of Additive Weights (LMAW) and Double Normalization-based Multiple Aggregation Methods (DNMA), the study systematically identifies, prioritizes, and ranks key factors influencing BT adoption in SCM. The study’s findings highlight crucial factors like enhanced transaction security, good supply chain practices, and risk management. Furthermore, it ranks the application of ports as prime candidates for BT integration. The research contributes theoretically by developing a hybrid model combining MCDA methods, and practically by guiding the strategic application of BT in the maritime logistics sector, aligning with the principles of Industry 5.0. This paper presents a novel approach that explores the utilization of BT in maritime supply chain management, incorporating MCDA in a vague environment. The research gap of this study lies in defining new contexts in both theoretical and practical literature reviews for extending the use of BT in SCM in the ports of Chile, according to Industry 5.0, to increase the efficiency and effectiveness of all aspects of operations in these places. The contribution of this research is applying hybrid MCDA methods in an uncertain environment to assist decision-makers (DMs) in better implementing BT in SCM in Chilean ports, according to Industry 5.0.

Multi-element integrated design of marine landscape in sustainable smart ports

In the era of economic globalization and heightened international competition, the emergence of free trade zones has significantly increased regional openness, introducing both new opportunities and challenges for ports. This paper proposes the enhancement of intelligent design in the maritime landscapes of smart ports, with a focus on optimizing internal pathways and developing a predictive model to gauge the impact of smart port landscapes. Furthermore, the study delves into the assessment of risks in smart port supply chains, employing an innovative approach that integrates rough set theory and neural networks. This novel model significantly improves the accuracy of risk evaluation in port supply chains, thereby providing crucial decision support for port management. Additionally, the economic efficiency of smart ports is scrutinized using the Data Envelopment Analysis (DEA) Malmquist index method. Through meticulous selection of research subjects, port efficiency indicators, and the DEA Malmquist index, this analysis offers a comprehensive insight into the economic operations of smart ports. This research not only offers guidance for port economic management but also establishes a framework for the sustainable development of smart ports, thereby ensuring their long-term viability.

The Emission Reduction Technology Decision of the Port Supply Chain

The technology options for sustainable development are explored with customer low-carbon preference in a port supply chain consisting of one ship and one port. Port supply chains can opt for either shower power or low-sulfur fuel oil to cut down emissions. We set game models considering three power structures: the port dominant (port-led Stackelberg game), the ship dominant (ship-led Stackelberg game), and the port and ship on the same footing (Nash game). We compare the performances of different technologies. It is shown that, when customer low-carbon preference and carbon tax are both low, LSFO is the appropriate choice from the supply chain’s profit perspective, SP is preferred from the emission control perspective, and LSFO is preferred from the social welfare perspective. However, when customers’ low-carbon preferences, carbon tax, and environmental concerns are all low or all high, LSFO should be adopted from the view of social welfare. The profits and carbon emissions of the supply chain in the Nash game are higher than those in the Stackelberg game. While the environmental concern is low, the social welfare of the supply chain in the Nash game is greater than that in the Stackelberg game. Otherwise, it is less than that in the Stackelberg game. The obtained results can help governments formulate policies and ships make emission reduction technology decisions according to their own interests.

Resilience analysis of maritime transportation networks: A systematic review

Abstract As supply chains in today's world become more complex and fragile, enhancing the resilience of maritime transport is increasingly imperative. The COVID-19 epidemic in 2020 exposed the vulnerability of existing supply chains, causing substantial impacts such as supply shortages, procurement constraints, logistics delays, and port congestion, highlighting the need to build resilient maritime transportation networks (MTN) and reigniting research on the resilience of maritime transport. Based on science mapping, we quantitatively analyzed the domain of resilience of MTN. We mainly study the resilience of MTN from the following aspects: construction of MTN and their topological characterization, vulnerability-oriented resilience analysis of MTN, recovery-oriented resilience analysis of MTN, investment decision-oriented resilience analysis of MTN, climate change-oriented resilience analysis of MTN and pandemic-oriented resilience analysis of MTN. This study reviews recent advances in MTN resilience research, highlighting research topics, shortcomings, and future research agenda.

Electromagnetic Susceptibility Analysis of the Operational Amplifier to Conducted EMI Injected through the Power Supply Port.

Operational amplifiers (op-amps) are widely used in circuit systems. The increasing complexity of the power supply network has led to the susceptibility of the power supply port to electromagnetic interference (EMI) in circuit systems. Therefore, it is necessary to investigate the electromagnetic susceptibility (EMS) of op-amps at the power supply port. In this paper, we assessed the effect of EMI on the operational performance of op-amps through the power supply port by a bulk current injection (BCI) method. Firstly, we conducted the continuous sine wave into the power supply port by a current injection probe and measured the change in the offset voltage under EMI. Secondly, we proposed a new method of conducted susceptibility and obtained the susceptibility threshold regularities of the op-amps at the power supply port under the interference of different waveform signals. Our study provided conclusive evidence that EMI reduced the reliability of the op-amp by affecting the offset voltage of op-amps and demonstrated that the sensitivity type of op-amps was peak-sensitive at the power supply port. This study contributed to a deep understanding of the EMS mechanism and guided the design of electromagnetic compatibility (EMC) of op-amps.

Development of a continuous water discharge drone using a supply port

Development of a continuous water discharge drone using a supply port

Analyzing Price and Profit Dynamics in Free Trade Port Supply Chains: A Blockchain-Centric Approach Under Consumer Sensitivity

Analyzing Price and Profit Dynamics in Free Trade Port Supply Chains: A Blockchain-Centric Approach Under Consumer Sensitivity

Port supply chain integration under mixed ownership

In the port supply chain, vertical integration between ports and shipping lines is no longer confined to private integration, but is more likely performed as a hybrid integration between public ports and private shipping lines. In this study, we consider port supply chain integration between a public or private port and its shipping line, which provides differentiated services in the shipping market, and investigate shipping lines’ competition contracts under mixed ownership. We show that if shipping lines choose a volume contract, double vertical integration between two ports and their corresponding shipping lines yields the highest welfare; however, if shipping lines choose a price contract, single private integration can yield the highest welfare. We also endogenize the supply chain integration and find that a double integration-and then-price contract is socially beneficial only when the private share of a mixed merger is low while the shipping service substitutability is neither high nor low. Our findings suggest that government ownership of a public port can serve as an efficient tool for port policy in the context of port supply chain integration.

Negative pressure booth with HEPA filter reduces the risk of airborne infection associated with transoesophageal echocardiography

Abstract Background The pandemic of coronavirus infection 2019 has persisted, despite reductions in disease severity and deaths. Transoesophageal echocardiography (TOE) is one of the aerosol-generating procedures and increases the risk of airborne infection. However, the effective strategy to reduce the risk has not been fully established. Purpose To evaluate the effectiveness of negative-pressure booth with high-efficiency particulate air (HEPA) filter in control of aerosol generated by TOE. Methods and Results In the TOE examination room, we installed negative-pressure booth. This booth has an air supply port on the ceiling and exhaust port on the head side of examination table, and the airflow is controlled by a push-pull method (Figure 1). The air changes per hour (ACH) for the entire room with was only 8, but 38 inside the booth, meeting the CDC recommended standard for airborne infection isolation room (ACH≥12). Visualization of the airflow by laser light scattering showed that the airflow in the booth bent the trajectory of particulates produced by the patient's cough and sent them to the exhaust port (Figure 2A). The size-specific quantifications for >0.3μm-, >0.5μm-, >1.0μm-diameter particles by a particle counter revealed that the peak particle concentrations within the booth were reduced by approximately 70% after 7 min of ventilation (Figure 2B) in unattended situation. In clinical setting, we monitored particle counts during TOE in 70 cases. Echocardiologists were at greater risk of aerosol exposure than assistants. Multiple regression analysis revealed that patients’ discomfort level during TOE and less experienced echocardiologists were independently correlated with increased particle counts (β=0.376, p=0.003 and β=0.355, p=0.005, respectively). However, aerosols generated in the early time of TEE were almost eliminated by the end of the examination by negative pressure booth. Conclusion The negative pressure booth effectively and quickly reduces small particles equating aerosols. It might be effective to reduce the risk of airborne infection and shorten the patients turnover time of TOE room even in the pandemic of infectious diseases.Figure 1Figure 2

High-Efficiency GaN-Based Power Amplifiers for Envelope Nonlinearities’ Mitigation in VHF Wideband Polar-Mode Transmitters

Space-based communications at the very high frequency (VHF) band for air traffic management is a new technology application under development that requires energy-efficient architectures to mitigate the power limitations of satellite platforms. The usage of high-efficiency radiofrequency (RF) transmitters can help reduce the power consumption, but nonlinearities concerning the amplified signal in wide fractional bandwidth systems are a problem to solve. This paper proposes a high-efficiency (RF) power amplifier (PA) for satellite communications at the VHF band that aims to reduce the envelope distortion inherent to wide fractional bandwidth multicarrier polar-mode transmitters. Its design is based on a solution called hybrid-coupled switching voltage PA in combination with gallium nitride (GaN) high electron mobility transistor (HEMT) technology. The developed VHF PA prototype delivers up to 95 W from a 28 V power supply, with a drain efficiency about 80% within the 118 MHz to 138 MHz operating band. To test its linearity performance, operating in a polar-mode configuration, a GaN-based wideband envelope amplifier (EA) has been developed to modulate the RF PA supply port. This EA improves its power efficiency by combining it with a slow envelope power supply (SEPS). Some measurements have been taken for a 100 W peak envelope power (PEP) and 10 MHz (maximum carrier spacing) four-tone digitally-modulated test signal, where any distortion product is attenuated 46 dB below the average power of the amplified signal without applying any digital predistortion (DPD) technique.

Port supply chain integration and sustainability: a resource-based view

PurposeIt is claimed that port supply chain integration (PSCI), thanks to its attributes, holds a potential to trigger a port to strategically sustain performance- and competitiveness-measures through strengthening and/or reinforcing an array of port sustainability aspects. This paper aims to empirically investigate the existent influence of PSCI on economic and environmental pillars of port sustainability.Design/methodology/approachBased on a resource-based view, this paper hypothesises that PSCI has a certain impact on port “economic” sustainability (PECS) and port “environmental” sustainability (PENS). Measures of PSCI, PECS and PENS are refined and validated using data collected from the maritime logistics industry in Egypt, and structural equation modelling is employed to test the hypothetical relationships.FindingsThe results indicate that a port having adopted an integrative strategy into supply chains could enhance its cost and operational efficiency, financial and investment situation, while offering high-quality services to its customers. Similarly, PSCI is emphatically correlated with water and air pollution management, energy efficiency and green port management practices.Research limitations/implicationsHaving identified the acute potential of PSCI for sustainable development in maritime logistics and supply chains, this line of research allows port operators and/or authorities to better understand strategic options with which they are able to improve their sustainability practices. This paper is, however, limited only to two dimensions of sustainability by not exploring the “social” aspect of port sustainability due to data-related issues.Originality/valueThis line of research could be regarded as an extended application from other industrial sectors to the port industry in a way to empirically examine the inclusive relationship of PSCI with economic and environmental parameters. The findings from this research make a due contribution to the field of port sustainability in general and Egyptian ports in particular.

5G and Companion Technologies as a Boost in New Business Models for Logistics and Supply Chain

The transport and logistics industry plays a crucial role in supporting the economy, but it faces various challenges, including high costs and the need for operational efficiency. To address these challenges, the industry is embracing digital transformation, and 5G networks are expected to play a significant role in this process. This paper explores the benefits of 5G technologies in the transportation and logistics sector, focusing on device density, low latency, network slicing, supply chain visibility, port operations, and enhanced communication. Additionally, the paper emphasizes the importance of stakeholder engagement and sustainability considerations in the adoption of innovative technologies. The research methodology involves an online survey administered to stakeholders in the port logistics sector, aiming to assess their knowledge and implementation of innovative technologies. The paper also reviews the relevant literature and highlights the potential of digital technologies, such as IoT, blockchain, AI, and 5G, in optimizing supply chains and port operations. The findings provide insights into the current state of knowledge and implementation of innovative technologies in port operations and the potential for market adoption and contribute to understanding the benefits and challenges of 5G technology in the logistics industry.

Optimization air-conditioning system and thermal management of data center via fan-wall free cooling technology

For data centers located in mild climate areas, the free cooling technology of the fan-wall air supply has great potential. However, there is currently little research on the optimization of air-conditioning system structural parameters and rack heat management in data centers using this technology. This paper studies the optimal design parameters of the internal structure of the air-conditioning system and determines the variation regularity of the inlet and outlet temperatures of the rack through the construction of a similar model for a fan-wall data center. The results show that: (1) The average supply heat index of the sieve with porosity of 60% is reduced by 57.5% and 50.3% compared to others, the average supply heat index of the fan-to-sieve distance of 35cm is reduced by 51.1% and 22.9% compared to others, and the average supply heat index of the fan wall arrangement in one column is reduced by 54.1% and 22.7% compared to others. (2) The two racks closest to the air supply port have the sharpest inlet temperature fluctuations, and the inlet temperature has stabilized from the third rack as the distance increases. (3) Hot spots in fan-wall data centers tend to occur in the lower part of the rack, and as the height decreases, the temperature of the inlet air increases.

Modelling the roles of fourth-party logistics (4PL) on the improvements of supply chain stability of port logistics services: the case of Ningbo-Zhoushan Port in China

This paper examines the challenges and significance of improving contractual cooperation within the supply chain of port logistics services in China. In the context of a port supply chain comprising port enterprises and shipping companies, contractual cooperation serves as a vital coordination mechanism for cost reduction, information sharing, and risk sharing. Additionally, fourth-party logistics providers (4PLs) play a crucial role in enhancing operational efficiency and overall stability. However, the limited rational behavior of individual firms poses challenges to the stability of contractual cooperation. To address these challenges, this study proposes a game model to analyze the evolution of contractual cooperation and identify key factors influencing stability. Practical recommendations are provided to enhance stability and promote the high-quality development of China's port logistics service supply chain. This research contributes to a deeper understanding of the main components of China's port logistics service supply chain, advances the theory of shipping supply chain contracts, and supports China's aspiration to become a global maritime and shipping powerhouse while maximizing global utility.

Coordination Mechanism of Revenue Sharing Contracts in Port Supply Chains: A Case Study of China’s Nantong Port

Considering the port function’s importance, the supply chain’s overall and individual revenues, and the port supply chain’s uniqueness, a game model for a two-stage port supply chain composed of port service providers and port enterprises was developed. Using revenue sharing contracts (RSCs) as a coordination mechanism, game equilibriums were investigated under two conditions: price-sensitive or price-insensitive port logistics service demand. The results suggested that RSCs can achieve Pareto improvement in both cases, thereby coordinating port supply chain revenues. Led by the port logistics service provider and port enterprise, the coordination mechanisms based on RSCs of port supply chain were discussed using logistics service capacity as the coordination link. Despite differing decision orders, the RSC model can coordinate the port’s supply chain with its service provider, while the port and logistics service provider determine the retention ratio. This paper also proposed coordination measures for the Nantong Port, one of the most important ports in China, to maximize the logistics capacity of iron ore supply chain and enhance the port logistics’ value-added services.