Channel Spacing Research Articles

Development Characteristics and Distribution Patterns of Fractures in the Wufeng-Longmaxi Formation Shale in the Southwestern Sichuan Basin, China

Abstract As the important storage space and main seepage channel of the shale gas reservoirs, fractures control the migration, enrichment, and preservation of shale gas. Therefore, studying the development characteristics of fractures within shale is the key to the exploration and development of shale gas reservoirs. Based on core observation, microscopic thin section examination, field-emission scanning electron microscopy (FE-SEM) analysis, and three-dimensional seismic attribute analysis, this paper studies the development characteristics and distribution patterns of fractures in the Wufeng-Longmaxi Formation shale in the southwestern Sichuan Basin. The results show the following: (1) Both macrofractures and microfractures are developed in the Wufeng-Longmaxi Formation shale in the study area. On the macroscale, horizontal bedding fractures, low-angle slip fractures, vertical shear fractures, and high-angle fractures are mainly developed; on the microscale, intergranular fractures, intragranular fractures, abnormally high-pressure fractures, hydrocarbon generation shrinkage fractures, bedding fractures, etc. are mainly developed. These fractures of different scales work together to create an intricate fracture system within the shale. (2) Based on the 3D seismic attribute analysis, the distribution patterns of fractures was studied in the research area. It was found that nearly east-west-trending and nearly south-north-trending large faults were mainly developed in the Wufeng Formation and the Long-11 submember, with accompanying small faults and secondary fractures. From the bottom boundary of the Wufeng Formation to the top boundary of the Long-11 submember, the fault development shape is unchanged, and the secondary fractures are developed gradually densely, showing the characteristics of a zonal distribution in the entire study area. From the bottom boundary of the Wufeng Formation to the top boundary of the Long-11 submember, the development of microfractures shows variation in different zones. Microfractures are mainly developed around large faults, and the development range of microfractures decreases from bottom to top, but the development of microfractures is gradually intensive. The microfractures are densely distributed from the central to the southern part of the study area (gradually from convergence to divergence), are sparsely distributed in the western part of the study area, and are densely and widely distributed in the northern, northeastern, and northwestern parts of the study area. The research results can provide some guidance for the prediction of shale gas sweet spots in this area, which is beneficial to the further exploration and development of marine shale gas in this area.

AI-Generated Face Image Identification with Different Color Space Channel Combinations.

With the rapid development of the Internet and information technology (in particular, generative adversarial networks and deep learning), network data are exploding. Due to the misuse of technology and inadequate supervision, deep-network-generated face images flood the network, and the forged image is called a deepfake. Those realistic faked images launched a serious challenge to the human eye and the automatic identification system, resulting in many legal, ethical, and social issues. For the needs of network information security, deep-network-generated face image identification based on different color spaces is proposed. Due to the extremely realistic effect of deepfake images, it is difficult to achieve high accuracy with ordinary methods for neural networks, so we used the image processing method here. First, by analyzing the differences in different color space components in the deep learning network model for face sensitivity, a combination of color space components that can effectively improve the discrimination rate of the deep learning network model is given. Second, to further improve the discriminative performance of the model, a channel attention mechanism was added at the shallow level of the model to further focus on the features contributing to the model. The experimental results show that this scheme achieved better accuracy in the same face generation model and in different face generation models than the two compared methods, and its accuracy reached up to 99.10% in the same face generation model. Meanwhile, the accuracy of this model only decreased to 98.71% when coping with a JPEG compression factor of 100, which shows that this model is robust.

Space-frequency-polarization-division multiplexed wireless communication system using anisotropic space-time-coding digital metasurface.

In the past few years, wireless communications based on digital coding metasurfaces have gained research interest owing to their simplified architectures and low cost. However, in most of the metasurface-based wireless systems, a single-polarization scenario is used, limiting the channel capacities. To solve the problem, multiplexing methods have been adopted, but the system complexity is inevitably increased. Here, a space-frequency-polarization-division multiplexed wireless communication system is proposed using an anisotropic space-time-coding digital metasurface. By separately designing time-varying control voltage sequences for differently oriented varactor diodes integrated on the metasurface, we achieve frequency-polarization-division multiplexed modulations. By further introducing different time-delay gradients to the control voltage sequences in two polarization directions, we successfully obtain space-frequency-polarization-division multiplexed modulations to realize a wireless communication system with a new architecture. The new communication system is designed with compact dual-polarized meta-elements, and can improve channel capacity and space utilization. Experimental results demonstrate the high-performance and real-time transmission capability of the proposed communication system, confirming its potential application in multiple-user collaborative wireless communications.

Optimisation of design and operating parameters of reverse osmosis process for the removal of phenol from wastewater

Reverse Osmosis (RO) is widely used for separating organic and inorganic pollutants in wastewater. In this research, the one-dimensional steady state model of a spiral wound RO for the removal of phenol from wastewater, was simulated using gPROMS software to identify optimal design and operating parameters. The design parameters included the membrane length, width and feed spacer channel and operating conditions included temperature and pressure of the RO process. The optimal design parameters were able to maximise the removal of phenol from wastewater. The simulation results showed that the removal of phenol from wastewater was significantly influenced by the combination of membrane width, operating pressure, and feed temperature. The four main parameters (permeate concentration, solute flow, solute rejection, and water flux) that govern the performance of a reverse osmosis membrane were found to be influenced by the design and operating conditions.

The Effect of C/Si Ratio and Fluorine Doping on the Gas Permeation Properties of Pendant-Type and Bridged-Type Organosilica Membranes.

A series of pendant–type alkoxysilane structures with various carbon numbers (C1–C8) were used to fabricate sol–gel derived organosilica membranes to evaluate the effects of the C/Si ratio and fluorine doping. Initially, this investigation was focused on the effect that carbon-linking (pendant–type) units exert on a microporous structure and how this affects the gas-permeation properties of pendant–type organosilica membranes. Gas permeation results were compared with those of bridged–type organosilica membranes (C1–C8). Network pore size evaluation was conducted based on the selectivity of H2/N2 and the activation energy (Ep) of H2 permeation. Consequently, Ep (H2) was increased as the C/Si ratio increased from C1 to C8, which could have been due to the aggregation of pendant side chains that occupied the available micropore channel space and resulted in the reduced pore size. By comparison, these permeation results indicate that pendant–type organosilica membranes showed a somewhat loose network structure in comparison with bridged–type organosilica membranes by following the lower values of activation energies (Ep). Subsequently, we also evaluated the effect that fluorine doping (NH4F) exerts on pendant−type [methytriethoxysilane (MTES), propyltrimethoxysilane (PTMS)] and bridged-type [1,2–bis(triethoxysilyl)methane (BTESM) bis(triethoxysilyl)propane (BTESP)] organosilica structures with similar carbon numbers (C1 and C3). The gas-permeation properties of F–doped pendant network structures revealed values for pore size, H2/N2 selectivity, and Ep (H2) that were comparable to those of pristine organosilica membranes. This could be ascribed to the pendant side chains, which might have hindered the effectiveness of fluorine in pendant–type organosilica structures. The F–doped bridged–type organosilica (BTESM and BTESP) membranes, on the other hand, exhibited a looser network formation as the fluorine concentration increased.

A study on ultra-thin and ultra-broadband acoustic performance of micro-perforated plate coupled with coiled-up space structure

The sound wave of low-frequency noise has strong penetration, consumes less energy in the propagation process, and is not easy to be consumed by traditional materials. In order to solve this problem, the micro-perforated plate (MPP) coupling a coiled-up space structure (MPCS) has been proposed. The MPCS is composed of an MPP and a coiled-up space structure, and its overall thickness is only 30 mm. The finite element method (FEM) and theoretical calculation were used to predict the sound absorption performance of a single MPCS. Results show that this structure is 100 % effective at absorbing sound at the resonance frequency. Moreover, the effects of the perforation ratio, aperture, and cavity length L of the MPCS have been studied in this paper. We constructed a sound-absorbing unit (MPCSs) consisting of three coiled-up space channels and six micro-perforated plates, then a broadband sound absorbing body (Bi-MPCSs) was constructed, which has two absorbing units with different parameters in parallel. Its sound absorption achievable reached more than 50 % in the range of 415 Hz–905 Hz, and the average sound absorption was more than 75.6 %. Next, the theoretical calculation results verify the accuracy of the simulation results. To further broaden the sound absorption performance of Bi-MPCS, a low-frequency and ultra-wide frequency sound absorption body (F-MPCSs) composed of four different parameters absorbing units (MPCSs) were constructed. Interestingly, the sound absorption of the absorber achieved more than 50 % in the range of 350 Hz–1150 Hz, and an average sound absorption reached 66.7 %.

First-Principles Study of the Phonon Lifetime and Low Lattice Thermal Conductivity of Monolayer γ-GeSe: A Comparative Study

Germanium selenide (GeSe) is a unique two-dimensional (2D) material showing various polymorphs stable at ambient condition. Recently, a new phase with a layered hexagonal lattice ({\gamma}-GeSe) was synthesized with ambient stability and extraordinary electronic conductivity even higher than graphite while its monolayer is semiconducting. In this work, via using first-principles derived force constants and Boltzmann transport theory we explore the lattice thermal conductivity ({\kappa}_l) of the monolayer {\gamma}-GeSe, together with a comparison with monolayer {\alpha}-GeSe and {\beta}-GeSe. The {\kappa}_l of {\gamma}-phase is relatively low (5.50 W/mK), comparable with those of {\alpha}- and {\beta}- phases. The acoustic branches in {\alpha}-GeSe are well separated from the optical branches, limiting scattering channels in the phase space, while for \b{eta}-GeSe and {\gamma}-GeSe the acoustic branches are resonant with the low-frequency optical branches facilitating more phonon-phonon scattering. For {\gamma}-GeSe, the cumulative {\kappa}_l is isotropic and phononic representative mean free path (rMFP) is the shortest (17.07 nm) amongst the three polymorphs, indicating that the {\kappa}_l of the {\gamma} phase is less likely to be affected by the size of the sample, while for {\alpha}-GeSe the cumulative {\kappa}_l grows slowly with mean free path and the rMFP is longer (up to 20.56 and 35.94 nm along zigzag and armchair direction, respectively), showing a stronger size-dependence of {\kappa}_l. Our work suggests that GeSe polymorphs with overall low thermal conductivity are promising contenders for thermoelectric and thermal management applications.

Design and analysis of a channel drop filter and demultiplexer based on a photonic crystal super ellipse-shaped ring resonator

In advanced optical communication systems, a photonic crystal (PC) based channel drop filter (CDF) and dense wavelength division multiplexer (DWDM) demultiplexer are essential components in the design of a complete DWDM system, which offers a high transmission data rate. In the present work, a novel PC, CDF filter and demultiplexer based on a ring resonator with a super ellipse shape is designed and analyzed. To design a high-performance device, the performance parameters of the proposed components, such as transmission efficiency, spectral line width, channel spacing, Q-factor and crosstalk, are investigated. The proposed CDF is designed to drop a resonant wavelength with a high quality factor of 3955, and the ring resonator design is extended to the demultiplexer. The demultiplexer is designed to drop the four resonant wavelengths of 1579.8 nm, 1582 nm, 1583.6 nm and 1574.9 nm, respectively. The observed high quality factor (3955), bandwidth (0.4 nm) and transmission efficiency (90%) of the proposed demultiplexer will support high-performance DWDM systems

16-channel O-band silicon-photonic wavelength division multiplexer with a 1 nm channel spacing

Silicon-photonic integrated circuits are a pivotal technology for the continued growth of data communications. A main task of silicon photonics is the wavelength division multiplexing of communication channels to aggregate bandwidths that exceed the working rates available in electronics. In this work, we design and implement a 16-channel, wavelength division multiplexing device in silicon-on-insulator. The device operates at the O-band wavelengths, centered at 1310 nm, which are favored by many data center applications. The spacing between adjacent channels is 0.96 nm (167 GHz), close to those of dense wavelength division multiplexing standards in the 1550 nm wavelength range (C band). The layout consists of 15 Mach-Zehnder interferometers, cascaded in a four-stage tree topology. The differential phase delay within each interferometer is precisely trimmed post-fabrication, through local illumination of a photosensitive upper cladding layer of As2Se3 chalcogenide glass. Trimming is performed subject to closed-loop feedback of transfer functions measurements. The devices can be useful in data center optical communications.

Self-adjusting inverse design method for nanophotonic devices.

Nanophotonic devices, which consist of multiple cell structures of the same size, are easy to manufacture. To avoid the optical proximity effect in the ultraviolet lithography process, the cell structures must be maintained at a distance from one another. In the inverse design process, the distance is maintained by limiting the optimized range of the location. However, this implementation can weaken the performance of the devices designed during transmission. To solve this problem, a self-adjusting inverse design method based on the adjoint variable method is developed. By introducing artificial potential field method, the location of one cell structure is modified only when the distances between this cell structure and other cell structures are smaller than a threshold. In this case, the range of the location can be expanded, and thus the performance of the designed devices can be improved. A wavelength demultiplexer with a channel spacing of 1.6 nm is designed to verify the performance of the proposed method. The experiment reveals that the transmission of the designed devices can be improved by 20%, and the self-adjusting inverse design process is 100 times faster than the inverse-design process based on the genetic algorithm.

Flow Field-Flow Fractionation with a Thickness-Tapered Channel.

This study introduces the thickness-tapered channel design for flow field-flow fractionation (FlFFF) for the first time. In this design, the channel thickness linearly decreases along the channel axis such that the flow velocity increases down the channel. Channel thickness is an important variable for controlling retention time and resolution in field-flow fractionation. Especially, in the steric/hyperlayer mode of FlFFF, in which particles (>1 μm) migrate at elevated heights above the channel wall owing to hydrodynamic lift forces, the migration of long-retaining smaller-sized particles can be enhanced in a relatively thin channel or by increasing the migration flow rate; however, an upper size limit that can be resolved is simultaneously sacrificed. A thickness-tapered channel was constructed without a channel spacer by carving the surface of a channel block such that the channel inlet was deeper than the outlet (w = 400 → 200 μm). The performance of a thickness-tapered channel was evaluated using polystyrene standards and compared to that of a channel of uniform thickness (w = 300 μm) with a similar effective channel volume in terms of sample recovery, dynamic size range of separation, and steric transition under different flow rate conditions. The thickness-tapered channel can be an alternative to maintain the resolving power for particles with an upper large-diameter limit, faster separation of particles with a lower limit, and higher elution recovery without implementing the additional field-programming option.

Decomposition of uplink multi-user OTFS channel with partial CSI feedback

This work studies system design methods for the uplink multi-user orthogonal time–frequency space (OTFS) channel which forms a virtual multiple-input multiple-output (MIMO) communication system. For such system, the received signal contains interferences in the space, frequency, and time domain at the same time. To reduce the computational complexity, this work proposes to decompose the original large MIMO channel into parallel small sub-channels in the following order: first to decompose in the space domain, then to decompose in the time domain, thereby reducing the computational complexity. To help achieve channel decomposition, the proposed method requires the transmitter to perform precoding that needs channel state information (CSI) feedback. However, the proposed method only needs partial CSI feedback including delay and Doppler shift, so the feedback burden is small. Simulation results of the bit error rate (BER) performance verify that the proposed channel decomposition method is effective.

High-speed multi-channel long-haul coherent optical transmission system

In this work, high-speed transmission over the long-haul optical channel using orthogonal frequency division multiplexing (OFDM) was investigated. Furthermore, we recommend mixing polarization division multiplexing (PDM) with coherent OFDM (CO-OFDM) and quadrature amplitude modulation (16-QAM) to improve spectral efficiency (SE) while transmitting over a wavelength division multiplexing (WDM) system. An 800 Gb/s WDM PDM-CO-OFDM-16QAM transmission system with various channel spacing of 100 GHz, 50 GHz, and 25 GHz is examined utilizing the OptiSystem (2021) version 18.0 software package over ten spans of 60 km standard single-mode fiber (SSMF). Different channel spacing WDM systems have been compared in terms of performance and SE. The results reveal that the WDM system with 100 GHz channel spacing has a longer transmission range and needs minimal optical signal to noise ratio (OSNR) at the reception. The 25 GHz channel spacing WDM system exceeds the others in terms of SE. Further, the effect of ultra-low loss and large effective area fiber in lowering span loss and nonlinear effects for 25 GHz channel spacing WDM system is investigated. The findings show that the system performance with the new fiber outperforms the SSMF. The acceptable bit error rate (BER) for this study is 0.033 (20% concatenated forward error correction (FEC) threshold).

Aβ Protein Detector Based on AAO Confined Self-Assembly System

With the advent of the aging of the world’s population, the number of patients suffering from Alzheimer’s disease (AD) is increasing year by year, and how to diagnose early and treat AD has become a problem for the world. After decades of hard work, people have made a series of breakthroughs in the pathogenesis of AD. One of the most widely accepted is that there is a large amount of amyloid-[Formula: see text] protein deposition in the body of AD patients. This also provides us with a new idea for early diagnosis of AD. In this paper, a confined self-assembly system based on AAO/ZnS is constructed to specifically respond to amyloid-[Formula: see text] protein. The obtained samples were characterized by FESEM, XPS and UV–Vis. This system specifically recognizes A[Formula: see text] protein by modifying the tryptophan enantiomers. The experimental results show that the samples synthesized under the self-assembly system of modified D-Trp have higher response sensitivity to amyloid-[Formula: see text] protein. This provides a new idea for the self-assembly system based on the limited space of the nano-biomimetic channel in biological detection, and also shows great potential in improving the sensitivity of the biodetector.

A novel bionic packed bed latent heat storage system filled with encapsulated PCM for thermal energy collection

• A bionic structure brings a more homogeneous temperature difference and a smaller pressure drop compared with conventional systems. • The parameters related to heat transfer and phase transition acquired from numerical study were validated by experiments. • A non-local thermal equilibrium model was employed to characterize the temperature distribution of PCM and HTF in porous media. • The enhancement of flow resistance and heat exchange performance was evaluated. The main content of this work is to propose a novel bionic solution to overcome the nonuniformity of flow and temperature distribution, which is an inherent problem and restriction for conventional latent heat storage devices. By learning from animal circulatory systems, the inner space and flow channel network are distributed hierarchically as arteries, veins, capillaries and ventricles. A conceptual configuration of the bionic system is presented, and its numerical model is established to demonstrate the flow and heat transfer phenomena. The encapsulated PCM that is used in this study is fabricated and parameters related have been measured by experiments. A numerical model of a 3D continuous PCM bed is established to help research the flow of HTF through the surfaces of PCM particles and the heat transfer between them. Then, a model of a simplified bionic device is developed where the PCM region is set as a porous domain. The results show the flow and temperature fields are distributed uniformly, along with a much smaller global pressure drop. By allocating the thermal load on cascaded layers with stepwise PCMs, a more homogeneous global temperature difference can be achieved.

대한민국 남해상(부산-제주도)에서의 TVWS 가용채널 이용에 관한 연구

This paper describes the first study in Korea on the use of available TV white space (TVWS) channels that can be used in the South Sea for terrestrial digital television (DTV) broadcasting bands. Focusing on the Busan-Jeju route in the Soutn Sea of Korea, the possibility of using TVWS frequencies of DTV broadcast signals (channels 14-51 and 470∼698 MHz) was studied. Through the characteristic analysis of domestic DTV channels and other unusual measurement data, the DTV spillover signals of Japan are confirmed, and it is deduced that the available TVWS channels that could be used in the South Sea are affected. The analysis confirmed that channel No. 39 (623 MHz) can be used as an available channel for TVWS without interference from existing DTV channels in all seas between Busan Port and Jeju Port. Additionally, two channels, channel 45 (659 MHz) and 47 (671 MHz), were found to be available for the TVWS frequencies on the Busan-Jeju Island route section, excluding Busan Port and Jeju Port.

Tunable Semiconductor Laser Based on Surface High-Order Bragg Gratings With 62 × 50 GHz Wavelength Tuning

A tunable semiconductor laser based on surface high-order Bragg gratings with 50 GHz channel spacing is demonstrated for the first time. The tunable semiconductor laser can cover 62 channels at 25 °C, and the side mode suppression ratio (SMSR) of each channel is larger than 34 dB. To achieve such properties, the number, depth and periods of the slots of the tunable semiconductor laser are optimized by the 2-D scattering matrix method (SMM) to obtain denser reflection peaks with smaller full width at half maximum (FWHM) and higher reflectivity. The tunable semiconductor laser can be widely used in dense wavelength division multiplexing (DWDM) systems and can provide a promising light source for photonic integrated circuits.

Deformation characteristics and permeability variations induced in the coal matrix induced by thermo-mechanical coupling

ABSTRACT To evaluate the coal deformation characteristics and explore the evolution law of coal permeability under different conditions, the MTS815 and PCI-2 acoustic emission (AE) test systems were applied to conduct the triaxial percolation test under other thermo-mechanical coupling conditions, and the fractal model of coal fractal with integrated stress and temperature was established. The results indicated that the peak stress, strength and deformation parameters of the samples were positively correlated with the confining pressure. The temperature can promote the crack propagation, derivation and new cracks of coal samples. The macrocracks and percolation channels space inside the samples increased with the increase of the thermal-mechanical coupling condition. The AE signal was mainly released in the plastic and peak phases; the growth of confining pressure intensified the aggravation of the internal damage to the coal sample and caused the frequent occurrence of AE signals. The compressive coefficient C f of coal fracture decreased with the addition of average effective stress, and the ruptured coal had the same trend with the increase in pore pressure; the calculated values of the new thermally sensitive model were consistent with the measured values. The applicability of the theoretical mechanism and the data matching were of high credibility.

Combined impact of SRS, FWM and ASE noise in UDWDM/DWDM long-haul communication systems using EDFAs

In this paper, the combined impact of SRS, FWM and ASE noise in center channels of 7-, 15-, 31- and 63-channel UDWDM/DWDM long-haul multi-span optical fiber communication systems using different numbers of EDFAs has been analyzed with simulations. UDWDM/DWDM systems with varying system parameters, i.e. channel input powers, channel spacing values, multi-span fiber lengths and numbers of EDFAs, have been taken into account in simulations. Comparative OSNR simulation results satisfying a minimum 23 dB OSNR criterion under the combined impact of SRS, FWM and ASE noise have been presented and evaluated. OSNR vs channel input power simulation results show that FWM becomes the most dominant effect with respect to SRS and ASE noise in UDWDM systems. Therefore, OSNR values decrease as channel input powers increase in multi-span UDWDM systems having 3.125 GHz and 6.25 GHz channel spacing values. However, both ASE noise and SRS become more dominant with respect to FWM in DWDM systems with 100 GHz channel spacing values. OSNR values increase as the channel input powers increase in those multi-span DWDM systems. Simulation results for OSNR vs channel spacing values show that OSNR values obtained in multi-span UDWDM systems increase as channel spacing values increase in the 3.125 GHz–6.25 GHz range. This is due to the decrease in FWM crosstalk, which has a dominant effect in UDWDM systems, with increasing channel spacing values in those UDWDM systems. However, OSNR values obtained in multi-span DWDM systems decrease as channel spacing values increase in the 12.5 GHz–100 GHz range. This is due to the increase in ASE noise, which has a dominant effect in DWDM systems, with increasing optical filter bandwidths of those DWDM systems. OSNR vs channel length simulation results show that OSNR values generally decrease with increasing total fiber lengths and inter-amplifier fiber lengths in both UDWDM and DWDM multi-span systems. This is due to the FWM crosstalk and the ASE noise, which become more dominant with respect to the SRS as the total fiber length and inter-amplifier fiber lengths increase. Simulation results for OSNR vs number of EDFAs show that OSNR values obtained in multi-span UDWDM systems having 3.125 GHz channel spacing values decrease with increasing numbers of EDFAs. However, OSNR values in multi-span UDWDM/DWDM systems having 6.25 GHz-100 GHz channel spacing range increase with increasing numbers of EDFAs. Simulation results provide important clues for the design and implementation of reliable long-haul UDWDM/DWDM systems.

Electride Formation in Ba–P System and the Unexpected Structure Transition of Electrides under Pressure

It is believed that the anionic electrons localized in the crystallographic subnanometer space (void, channel, and interlayer) can stabilize electrides and affect their electronic and magnetic properties. However, the influence of anionic electrons on the stability and properties of electrides is not clear yet. In the present work, ab initio evolutionary structure searches, combined with the first-principles calculations, were employed to predict the stable structures of the Ba–P system under external pressures of 0–20 GPa. Among these predicted compounds, Ba5P3 and Ba8P5 were identified as 1D and 0D electrides, respectively. Our calculations proved that anionic electrons dominate the magnetic and electronic properties of Ba–P electrides. Moreover, it is revealed that anionic electrons have two effects on the stability of electrides: the stabilizing effect caused by the attraction of anionic electrons and the surrounding cations in both 0D and 1D electrides and the destabilizing effect caused by the repulsion between anionic electrons in 1D electrides. Upon the applied external pressure, both effects can be weakened in Ba5P3, while only the former effect was weakened in Ba8P5. Therefore, the 1D electride Ba5P3 becomes thermodynamically stable over the 0D electride Ba8P5 with increasing pressure, which is opposite with the previous concept that the low-dimensional electrides are usually more stable than the high-dimensional ones. The finding of this study may shed light on the design and synthesis of new electrides with different dimensions with the assistance of an external pressure.