Port Space Research Articles

Spatial production and evolution of commercial ports in the ocean shipping era: A case study of modern Fuzhou and Xiamen in Fujian province, China

Commercial ports are vital regional intersections in the era of globalization, relying on maritime networks and local convergence to facilitate the movement of goods, people, and ideas. The term “The Five Treaty Ports” marks the beginning of foreign territorial leases for trade in China. During this period, the spatial planning and infrastructure development of commercial ports dynamically responded to the rapid progress of globalization. This article uses the commercial port cities of Fuzhou (Foochow) and Xiamen (Amoy) as case studies, examining how advancements in shipping technology influenced the evolution of port spaces. It traces the transformation of urban port spatial landscapes through the “sailing ship era,” “steamship era,” and “oil tanker era.” These eras not only carried the enlightenment of mercantilist ideas and featured characteristics of “industrialization for the nation,” but also reflected the significant influence of capitalist “market expansion” ideas in spatial configurations. Furthermore, the article argues that the spatial representation of modern commercial ports embodies the collaborative forces of mercantilism, colonialism, and capitalism, promoting globalization through trade. This research aims to explore the evolution of modern commercial port spaces, analyze the progressive transition from mercantilism to capitalist production modes, and ultimately enhance understanding of the globalization process within port spaces.

Analysis of spiral antenna for enhancing antenna-plasma coupling impedance for SST-1 tokamak

Abstract A detailed characterization of a high-power radio frequency (RF) broadband circularly polarized two-arm spiral antenna is designed to operate within the frequency range of 0.1–1.0 GHz. The impedance matching network technique is introduced to optimize its performance. The traditional spiral antenna is excited by a vertical or horizontal balun, whereas the proposed design is directly fed by a coaxial cable featuring a planar feeding section specially optimized to achieve broadband input impedance matching. The spiral antenna is designed as per the steady-state superconducting tokamak (SST-1) port space constraints. The simulated efficiency of the RF power coupling with the hydrogen plasma is ∼70 %. Through simulation, it was evident that the proposed antenna exhibited inherent resonance at 0.5 GHz with a reflection coefficient of −27.94 dB and an axial ratio is 3.39 dB respectively. The obtained outcomes unequivocally demonstrate the circular polarization of the designed antenna. Overall, the findings support the enhancement of plasma heating and current drive techniques in fusion research.

Hepatoprotective effect of amifostine and WR-1065 on acetaminophen-induced liver toxicity on Wistar rats.

The most important problem with acetaminophen is its hepatotoxicity. N-acetylcysteine (NAC) is used to treat the hepatotoxicity of acetaminophen. Due to the structural similarities of this compound with amifostine, we decided to test the effect of this substance and its metabolite, WR-1065, on the hepatotoxicity of acetaminophen. The single-dose method contained 1. Control; 2. Acetaminophen (1 g/kg, gavage); 3-5. Acetaminophen + amifostine (100, 200, 400 mg/kg, i.p.); 6-8. Acetaminophen + WR-1065 (50, 100, 200 mg/kg, i.p.); and 9. Acetaminophen + NAC (100, 200 mg/kg, i.p.). The multiple-dose method included the same groups: amifostine (50, 100, 200 mg/kg), WR-1065 (25, 50, 100 mg/kg), and NAC (100 mg/kg). Then, animals were sacrificed, and blood samples were collected for measuring ALT, AST, ALP, and T-Bil, liver tissue for histopathological examination, MDA, and GSH amounts. Acetaminophen increased the levels of MDA, T-Bil, ALT, AST, and ALP, decreased GSH levels, and augmented necrosis, neutrophils, lymphocytes, and macrophages in the port space in single-dose and multiple-dose studies. Amifostine and WR-1065 significantly reduced the levels of MDA, T-Bil, ALT, AST, ALP, increased GSH content, and ameliorated histopathological alterations in a single-dose and multiple-dose method compared to the acetaminophen group. Moreover, NAC caused a significant decrease in the levels of MDA, T-Bil, ALT, AST, and ALP, and reduced GSH amounts in single-dose and multiple-dose studies. Amifostine and WR-1065 as antioxidant and hepatoprotective compounds are effective in reducing acetaminophen-induced hepatotoxicity with a similar effect to NAC and can be administered as an adjunct in the treatment of acetaminophen overdose.

Validate robot-assisted total laparoscopic hysterectomy with four equally-spaced ports without an assistant port.

To evaluate the usefulness of robot-assisted total laparoscopic hysterectomy with four equally-spaced ports (RA-TLH/4e) without an assistant port. In RA-TLH/4e, four da Vinci ports were placed horizontally at a height of 4cm above the umbilicus with 8cm equal spacing. Poor development of the surgical field or difficult forceps manipulations were handled with the endoscope and forceps movement (port-hopping). Patient background, surgical outcomes, complications, port-hopping frequency were compared in three groups: RA-TLH/4e, RA-TLH with four unequally-spaced ports (RA-TLH/4u), and conventional RA-TLH with five ports (RA-TLH/5). There were no significant differences in patient background or surgical outcomes among the three groups except for age, preparation time, and hospital stay, and no cases of laparotomy conversion or serious complications. RA-TLH/4e had fewer port-hoppings than RA-TLH/4u. The minimum abdominal width showed a weak negative correlation with port-hopping frequency in RA-TLH/4u, but not in RA-TLH/4e. RA-TLH/4e allowed for a reduction in personnel and costs compared to RA-TLH/5. The equal placement of four ports allowed sufficient port spacing even for patients with narrow abdominal widths. In addition, the port-hopping technique was able to fully compensate for the lack of an assistant port. RA-TLH/4e is a highly useful technique that not only excels in safety but also reduces costs.

Analysis of the Load‐Bearing Capacity of the Steel‐Shell Concrete Support Structure Formed by the Construction of the Pipe Curtain Freezing Method

The Sanya estuary passage project is the latest and highly technical underground project after the large shield underground construction, which is of great significance to the construction of the Hainan free trade port and underground space construction innovation. In this paper, we use finite element software to analyze the deformation, stress, and surface settlement of the pipe curtain structure during construction under two conditions (original riverbed line and maximum scour riverbed line) in order to provide guidance for the actual project. Numerical simulations show that due to excavation and unloading, the bottom and top of the pipe curtain structure are subject to tensile stress; the bottom rises, the top settles, and converges in the horizontal direction; under the original riverbed line condition, the displacement values of each index are larger; changing the riverbed line does not change the maximum and minimum main stress of the pipe curtain structure significantly, and the stiffness of the pipe curtain structure can meet the maximum water level and the maximum scour in two unfavorable conditions; the pipe curtain structure can meet the structural. The pipe screen structure can meet the structural load‐bearing requirements. Suggestions for the design and construction of the project: strengthen the thickness of the pipe curtain at the side wall position, that is, use larger diameter steel pipes; do a good job of antiseepage and anticracking of the concrete at the corner of the pipe curtain structure and the side wall position during the construction process.

Laser Thomson scattering system for anisotropic electron temperature measurement in NUMBER

A laser Thomson scattering system is developed to obtain anisotropic electron temperature in a pulse operated electron cyclotron resonance plasma device. Injecting a laser with an oblique angle to the external magnetic field and detecting scattering photon from a line of sight along another oblique angle enable us to obtain parallel and perpendicular components of electron temperature. Backward (165°) scattering spectrum corresponds to quasi perpendicular velocity distribution, while that for forward (15°) scattering; quasi parallel. Collecting lenses are set in vacuum to maximize solid angle in a limited space of port, where the laser path and collecting optics share an ICF152 flange. Rayleigh scattering intensity is measured as a function of argon gas pressure. An initial result on residual stray light intensity is equivalent to the argon Rayleigh scattering intensity under ≤ 1 kPa of filled pressure. In order to obtain Thomson scattering spectra, a notch filter type stray light rejection optics, which utilize a reflective type volume holographic grating, is evaluated. Notch width (0.2 nm) and flat transmittance (≥ 90%) outside the notch measured for a prototype show that it is an effective optics.

Flows as Makers and Breakers of Port-Territory Metabolic Relations: The Case of the Loire Estuary

Ports worldwide are shifting from their original locations, and the reasons behind these patterns of port development are multifaceted. Reasons for locational changes may include local factors such as natural conditions, or global trends like containerisation. This article argues that flows play a significant role in making and breaking metabolic relations between spaces. The authors use a combination of qualitative and quantitative approaches to characterise the evolution of port and territory interactions. A historical sequencing illustrates the successive phases of connection and disconnection between port and non-port spaces over the years. Drawing from the urban metabolism framework, the analysis of a port’s traffic structure demonstrates how flows influence a port’s extraterritoriality. For this research, the case of the Loire estuary was chosen: the Grand Maritime Port of Nantes Saint-Nazaire is a polycentric port that originated in Nantes and extended coastward in Saint-Nazaire. The case study reveals that a port reaching an urban area does not necessarily mean it will engage or support metropolitan development. Moreover, it concludes that flows are active drivers of territorial development in port regions. The research more broadly discusses the extraterritoriality of large logistics and transport infrastructure, like that of ports.

Concentration Field Estimation on Effluent Mixing and Transport With a Parameter‐Based Field Reconstruction Convolutional Neural Network and Random Forests

AbstractEstimating the concentration field of effluent mixing and transport is a challenging task because of the complex mechanisms and three‐dimensional (3D) variability, but it is of great importance for water quality assessment and water resources management. Sophisticated numerical models based on the 3D computational fluid dynamics (CFD) technique can provide accurate predictions, but they are computationally expensive and require high‐level 3D CFD expertise, impeding their widespread usage. This work primarily develops a Parameter‐based Field Reconstruction convolutional neural network (PFR‐CNN) that can predict the complete concentration field of a target variable using the main influencing parameters, and explores the possibility of employing the proposed network to model the process of effluent mixing and transport. A validated numerical solver, TwoLiquidMixingFoam, was utilized to provide extensive data for multiple vertical buoyant effluents. A PFR‐CNN was developed to estimate the concentration fields based on the densimetric Froude number (F) and normalized port spacing (S/D). The network was developed using the training‐validating dataset from the numerical dataset, and further assessed using additional testing data. A random forest model was also developed, and the results showed that both methods can provide good performance, but the PFR‐CNN method was more robust and required less disk storage space. The results of our study demonstrated that the proposed PFR‐CNN approach is a promising tool for estimating effluent mixing and transport, and can be potentially leveraged to estimate other variables in the field of water resources with the governing parameters.

In vivo study of anticancer activity of ginsenoside Rh2-containing arginine-reduced graphene in a mouse model of breast cancer.

This study aims to evaluate the in vivo anticancer activity of arginine-reduced graphene (Gr-Arg) and ginsenoside Rh2-containing arginine-reduced graphene (Gr-Arg-Rh2). Thirty-two mice with breast cancer were divided into four groups and treated every three days for 32 days: Group 1, PBS, Group 2, Rh2, Group 3, Gr-Arg, and Group 4, Gr-Arg-Rh2. The tumor size and weight, gene expression (IL10, INF-γ, TGFβ, and FOXP3), and pathological properties of the tumor and normal tissues were assessed. Results showed a significant decrease in TGFβ expression for all drug treatment groups compared with the controls (P=0.04). There was no significant difference among the groups regarding IL10 and FOXP3 gene expression profiles (P>0.05). Gr-Arg-Rh2 significantly inhibited tumor growth (size and weight) compared with Rh2 and control groups. The highest survival rate and the highest percentage of tumor necrosis (87.5%) belonged to the Gr-Arg-Rh2 group. Lungs showed metastasis in the control group. No metastasis was observed in the Gr-Arg-Rh2 group. Gr-Arg-Rh2 showed partial degeneration of hepatocytes and acute cell infiltration in the portal spaces and around the central vein. The Gr-Arg group experienced a moderate infiltration of acute cells into the port spaces and around the central vein. The Rh2 group also showed a mild infiltration of acute and chronic cells in portal spaces. Based on the results, Gr-Arg-Rh2 can reduce tumor size, weight, and growth, TGF-β gene expression, and increase tumor necrosis and survival time in mice with cancer.

Spatial expansion regular pattern and driving factors of estuarine and coastal harbors

The port coastline is an important part of China's coastal zone, and changes to the port space and coastline profoundly impact the management and governance of China's coastal zone. Although port space has been widely examined, the regular pattern and driving factors of coastal port space expansion from a land use patch perspective remain unclear. We selected typical estuarine and coastal harbors and analyzed the basic regularity and driving factors of their spatial expansion using remote sensing and geographic information system technology. The regular patterns of estuarine and coastal harbors showed that because of their different locations, estuarine harbors have experienced an estuarine harbor stage, coexistence stage in estuarine and coastal harbors, and deep-water harbor stage. Furthermore, coastal harbors have experienced a coastal harbor stage, urban fringe, and deep-water harbor stage. Berths at ports, wharf lengths, port areas, port scopes, and port cargo demands also show phased characteristics. Analysis of the driving factors showed that in the early stage of port formation, geographical location significantly impacts estuarine harbors, with less pronounced effects on coastal harbors. Cargo demand has significant effects on the entire port expansion process. The influence of port engineering technology on coastal harbors was greater than that on estuarine harbors during the rapid port expansion stage. The impact of large-scale ships on estuarine harbors was greater than that on coastal harbors. This study provides information on port spatial expansion theories, which can aid port enterprises to better understand the regular pattern and driving factors of port development to improve development plans. Our findings also provide a reference for governmental agencies at all levels to formulate port planning, promulgate management policies, and provide basic data for future port and urban development in China.

Contested spaces in the new blue economy: Competing for Connecticut's Thames River Working Waterfront

AbstractWorking waterfront space is limited, leading to competition for coastal space among different waterfront‐dependent industries as well as non‐waterfront dependent users. Coastal margins will be shrinking as sea levels rise due to climate change, squeezing already scarce port resources, exacerbating competition for these spaces, and generating conflicts. This paper focuses on the competition for waterfront space on the Thames River of Connecticut bordered by the municipalities of New London, Groton, Norwich, Ledyard, and Montville. Emerging wind power in the new Blue Economy looks to reshape port usage in the Thames River. The recent focus on wind generation by the State of Connecticut, coupled with several competitive bidding events for wind‐generated electricity, has augmented demand for port space that will serve as a staging area for this offshore development. Although the development of wind power will occur offshore, Connecticut ports are anticipating port use by wind companies with winning bids. This paper explores the processes by which port space has been (re)allocated and contested, and examines the nature of the ensuing conflicts and outcomes.

Ergonomic port placement in robotic colorectal surgery

AbstractAimThe aim of the study was to determine how spacing between ports and alignment of ports (oblique or vertical) influences manipulation angles in robotic colorectal surgery.MethodAbdominal CT scans of 10 consecutive robotic right hemicolectomy and 10 consecutive robotic high anterior resection patients were analysed. The manipulation angles were calculated using fixed points on the preoperative abdominal coronal CT scan. Port placements were marked on the CT scan. The fixed points used to measure the manipulation angles were from the most lateral part of the caecum, hepatic flexure, splenic flexure, the descending colon/sigmoid colon junction and the sigmoid colon/rectum junction.ResultsFor right hemicolectomy and high anterior resection surgery, a port spacing of 8 cm compared with 6 cm resulted in greater manipulation angles. With 6‐cm port spacing, wider manipulation angles were not achieved with vertical port alignment compared with oblique alignment except for dissection at the splenic flexure.ConclusionsThe greatest manipulation angles were achieved with the oblique 8‐cm port spacing, which should be used in most cases.

Broadband Waveguide Dual-Polarization Four-Way Power Divider for Small Passive Arrays

A waveguide dual-polarization four-way power divider is described. It relies on a novel, broadband, and compact offset twist design, enabling an output port spacing of about 0.7λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> at the lowest operating frequency, which represents an improvement by approximately a factor of 2 over previously reported solutions with similar characteristics. With a highly integrated two-probe orthomode transducers (OMTs) and E-plane T-junctions arrangement, the proposed device provides good matching to free space in a small array configuration of open-ended waveguides. The concept is detailed through a specific implementation in the K-band, designed to operate over the frequency range of 17.7-20.2 GHz. The numerical model of the power divider alone achieves a frequency bandwidth up to about 3 GHz with a return loss better than 22 dB. Combined with an OMT for test purposes, the designed prototype demonstrates return loss better than 19 dB over the targeted bandwidth. This concept is of interest for the design of small passive array beamforming networks in the millimeter-wave band.

Integration of service pipes into the lower port for the DEMO Double Null Concept Design Study

A study into the viability of a double null concept for DEMO has been undertaken as part of the work to address Key Design Integration Issues within the DEMO powerplant. The objective of this study was to evaluate the feasibility of a double null architecture featuring split blanket segments to enable a wider range of maintenance options.One of the main challenges found was the integration of the service pipes to provide connections to the cooling and tritium breeding systems for the divertor and breeding blanket. By understanding how these pipes might be integrated, the constraints on key details such as the length of the lower port could be understood. This allowed for progression of other areas of the design and investigations into the remote handling of these pipes during maintenance periods.The key requirements identified for the service pipe routing included determining the removal sequence for the blanket and divertor segments during maintenance; access for the cutting and welding tool at the pipe/blanket interface; pipes grouped as modules per component; and optimisation of port space for the vacuum pumps.Two proposals were considered to investigate their impact on the insertion location for the cutting and welding tool: pipes with large radii, and pipes with smaller radii. The former was found to be preferable due to the remote maintenance advantages, versus the limited space gains offered by the latter. This paper will describe the development of these requirements, both proposals, and discuss the challenges uncovered during the study in more detail.

Controllable Goos–Hänchen shift and optical switching in an Er3 + -doped yttrium aluminum garnet crystal

We propose an efficient scheme to control Goos–Hänchen (GH) shifts of the reflected and transmitted beams in a cavity containing Er3 + -doped yttrium-aluminum-garnet (YAG) crystal with a four-level Er3 + ionic system. It is found that both the values and signs of the reflected and transmitted GH shifts can be coherently controlled by tuning the relevant optical parameters, such as the incoherent pumping rate, and the intensity and detuning of the driving field. Furthermore, we propose a scheme for such a configuration of the reflected GH shift as a family of reflection-type optical switchings. It is shown that the average port spacing and reflectivity of the optical switching can reach approximately 1.03 mm and 16.88, respectively, which indicate the high performance of switching function. Our proposal may provide a possibility to implement optically tuned optical switching.

Container storage space assignment problem in two terminals with the consideration of yard sharing

Facing the shortage of storage space of container terminal yard, a yard sharing strategy that uses dry port's surplus storage space to ease container congestion is proposed. This novel strategy can address the container storage space assignment problem for inbound containers. The problem is studied based on the storage yard of the combined container terminal and dry port. First, a multiple-objective mixed integer programming model that considers yard sharing strategy with the objectives of minimizing total travel distance, minimizing imbalance in number of containers, maximizing shared storage space of the dry port is formulated to obtain optimal solutions. Second, a non-dominated sorting genetic algorithm II (NSGA-II) is proposed. Next, the performance of the algorithm is verified by a set of instances. Numerical experiments are conducted to elucidate the problem with yard sharing strategy intuitively. Furthermore, the performance of the model in four aspects proclaims the advantages of yard sharing strategy and certifies the comprehensiveness. Finally, sensitivity analysis is conducted by two aspects which are weight coefficient and feasible distance to verify the efficiency of the proposed method.

A New Gysel Out-of-Phase Power Divider With Arbitrary Power Dividing Ratio Based on Analysis Method of Equivalence of N-Port Networks

An equivalent method has been presented to analyze an N-port network composed of transmission lines or coupled lines. Based on this method, a three-port coupled line with one-port short-circuited can be seemed equal to another three-port network without port coupling at the central frequency. A new Gysel out-of-phase power divider with output port spacing approaching 0 wavelength at the central frequency, arbitrary power dividing ratio, and arbitrary terminal real impedance has been proposed to reduce the size and output port spacing. A power divider with power dividing ratio k <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> = 3 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> and a power divider with power dividing ratio k <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> = 1000 have been implemented on printed circuit board (PCB). It can be observed that there is good agreement between the simulated and measured results.

MAR, PUERTO, CIUDAD Y HORIZONTE. EL CENTRO BOTÍN DE LAS ARTES Y LA CULTURA EN SANTANDER

El Centro Botín de las Artes y la Cultura, diseñado por Renzo Piano con la colaboración de Luis Vidal + Architects, ha reconfigurado el espacio portuario de Santander frente a su bahía. En este artículo se revisa el proceso histórico de la formación de este suelo y su relación con la ciudad para entenderlo como el espacio-soporte en el que acontece esta arquitectura. Siendo parte del proceso de transformación urbana, las relaciones con la ciudad y los nuevos recorridos que provoca, justifican su posición, su forma, su construcción y su relación con el paisaje. Actualizado el soporte urbano y arquitectónico, el espacio portuario hasta el Palacio de Festivales se completa y ciudad y bahía quedan como fondos de escenario de diferentes actividades que ponen en valor otras construcciones de otras épocas que son también parte de la memoria y de la identidad de la ciudad.

Sparsely Excited Tightly Coupled Dipole Arrays Based on Irregular Array Techniques

An innovative architecture for sparsely excited tightly coupled dipole arrays is proposed, based on the irregular array techniques. In such a framework, an improved maximumentropy model considering the difference of embedded element patterns is applied to optimize the irregular partition to suppress the grating lobes. Meanwhile, guidelines for the entire design procedure including antenna elements, power dividers, and optimization design of irregular feeding networks are presented. In order to achieve large elevation angle scanning, the differential evolution (DE) algorithm is used to synthesize active pattern and active reflection coefficient simultaneously. Finally, a 192-port prototype operating at 8-12 GHz has been fabricated and measured, where the port spacing is 0.576λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">h</sub> (λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">h</sub> is the free-space wavelength at the highest frequency). Numerical and experimental results show that the prototype array is able to achieve the reduction of gain <; 1 dB for scanning to near broadside and about 2.7 dB for scanning up to 60°, in comparison with that of conventional Taylor arrays.

The Jewish workers in the port of Thessaloniki (1939-1943): Their war experience as workers, Greeks and Jews

This article explores the last chapter in the long history of the Jewish port workers in the waterfront of Thessaloniki—the World War II years. The Jewish blue-collar workers and white-collar workers shared a common history, and at the same time, each had a different story to tell on the drama of the war. Their everyday experience in the roles of workers, soldiers, non-combatants, and as Greek civilians reveals the Jewish role in shaping the space of the wartime port during three periods: Greek neutrality (September 1939 to September 1940), the Greek-Italian War (October 1940 to March 1941), and German occupation from April 1941 to March 1943, when the port became an ‘Aryan’ space.