Chain Structure Research Articles

Scene Adaptive Context Modeling and Balanced Relation Prediction for Scene Graph Generation

Scene graph generation (SGG) aims to perceive objects and their relations in images, which can bridge the gap between upstream detection tasks and downstream high-level visual understanding tasks. For scene graph generation models, over-fitting the head predicates can lead to bias in the generated scene graph, which has become a consensus. A series of debiasing methods have been proposed to solve the problem. However, some existing debiasing SGG methods have a tendency to over-fit the tail predicates, which is another type of bias. In order to eliminate the one-way over-fitting of head or tail predicates, this paper proposes a balanced relation prediction (BRP) module which is model-agnostic and compatible with existed re-balancing methods. Moreover, because the relation prediction is based on object feature representation, this paper proposes a scene adaptive context fusion (SACF) module to refine the object feature representation. Specifically, SACF models the context based on a chain structure, where the order of objects in the chain structure is adaptively arranged according to the scene content, achieving visual information fusion that adapts to the scene where the objects are located. Experiments on VG and GQA datasets show that the proposed method achieves competitive results on the comprehensive metric across R@K and mR@K.

A Family of Two-Dimensional Quaternary Compounds A2BXY2 (A = K, Na; B = Li, Na; X = Al, Ga, In; Y = P, As, Sb) for Optoelectronics Applications.

Expanding material types and developing two-dimensional (2D) semiconductor materials with high performance have been hotspots in the field. In this research, it is found that the 12 existing semiconductors A2BXY2 (A = K, Na; B = Li, Na; X = Al, Ga, In; Y = P, As, Sb) have a pronounced layered structure. We predict their 2D structures and properties, using first-principles calculations. Lower exfoliation energies confirm the feasibility of mechanical exfoliation from their bulk phases and that the 2D structures can be stabilized independently at room temperature. Interestingly, A2BXY2 has an anionic tetrahedral one-dimensional chain or two-dimensional mesh structure of [XY2]3- composed of elements III-V. All A2BXY2 monolayers exhibit direct or indirect band gap features (0.78-1.94 eV). More encouragingly, the A2BXY2 monolayers possess ultrahigh carrier mobilities (∼105 cm2 V-1 s-1) at room temperature. Furthermore, the results based on the nonequilibrium Green's function indicate that 2D A2BXY2 exhibits a high ON/OFF ratio (∼104). To sum up, the A2BXY2 family is an outstanding promising candidate for optoelectronics application.

A bibliometric analysis of customer experience in the omni-channel era

ABSTRACT In the fiercely competitive market, coordinating physical and digital channels to deliver a seamless omnichannel customer experience (OCX) has become crucial after the COVID-19 pandemic. However, existing research on OCX lacks a comprehensive understanding due to fragmented approaches. This underscores the critical necessity of establishing a structured framework to formulate an omnichannel customer experience strategy. To bridge this gap, this study conducts a multifaceted approach bibliometric analysis to examine influential aspects of literature from 2014 to mid-June 2023 using science mapping techniques. This research contributes by identifying research streams related to the need for recognizing aspects that affect the customer experience, the influence of technology, logistical challenges, and omnichannel fulfillment strategies. Furthermore, the study proposes a new comprehensive theoretical framework for OCX strategy implementation, which includes a proposed omnichannel supply chain structure. Implications for managers and researchers, along with suggested research questions to guide future investigations, are provided

First hyperpolarizability of cellulose nanocrystals: an experimental and theoretical investigation.

Cellulose nanocrystals (CNCs) have attracted considerable interest due to their optical properties, though their nonlinear optical behavior remains largely unexplored. In this paper, we investigate the second-order nonlinear optical (SONLO) response of CNCs through both experimental and theoretical investigations. Hyper-Rayleigh scattering (HRS) experiments revealed values comparable to well-known nonlinear optical biomaterials, such as collagen, and on par with inorganic reference materials like KDP. The strong response in CNCs can be attributed to the well-ordered structure of the cellulose chains, which enhances the overall susceptibility of the nanoparticles. Quantum chemical modeling using density functional theory (DFT) was employed to simulate the molecular hyperpolarizability of CNCs. The study reduced the complex first hyperpolarizability tensor of the CNCs to two key components, βzzz and βzyy. An electrostatic model was applied to account for the CNCs' shape and dielectric properties, leading to strong agreement with the experimental data. Our findings highlight the potential of CNCs for optoelectronic applications and provide valuable insights for characterizing CNC-based mesomaterials through two-photon microscopy.

The specifics of knowledge transfer in franchising. The case of a beauty salon

The transition from a direct sales business model to a franchise model requires a review of the company’s strategy, structure and key business processes. One of the key tasks for the company’s management is knowledge management, which plays an important role in ensuring its competitiveness. Changing the business model involves alterations in the value chain and organizational structure of the company in the context of franchising.This study focuses on the business format franchise, where the management company not only transfers the right to a product and service, but also provides a complete business format, including a marketing strategy, quality standards, and a set of organizational knowledge about the specifics of providing services. Using the example of the 4hands manicure and pedicure salon network, practical aspects of transformation are demonstrated, such as the transfer of operational functions to franchisees and difficulties in communication within the network. The importance of effective knowledge transfer is emphasized as one of the factors of sustainable growth of the franchise network. Knowledge is also considered as a strategic resource that provides a competitive advantage of the company, which is confirmed by the analysis of the VRIO model.

Simulating waves induced by landslide using coupled smoothed particle hydrodynamics and discrete element method: Evaluating the impact of irregular rock shapes

The morphology of rock plays an important role in the process of landslide-induced wave, yet it is often neglected in current studies. This work aims to fill this gap by investigating the impact of irregular rock shapes on landslide-induced wave generation and propagation via coupling smooth particle fluid dynamics and discrete element method from a multi-scale perspective. Initially, the wave induced by particle column collapse is reproduced and validated against existing results. Subsequently, the influence of rock shapes, particularly the aspect ratio of particles on landslide-induced waves, is analyzed. The findings indicate that spherical particles, due to their low self-locking tendency and simple force chain structure, exhibit higher average velocities and more stable velocity changes during the landslide process. Spherical particles generate larger free surface waves with smoother and more regular waveforms when entering the water. In contrast, irregular polyhedral particles produce multiple secondary wave peaks alongside the main wave. The wave height induced by these particles is negatively correlated with aspect ratio. Specifically, the maximum run-up height of waves generated by elliptical particles with the highest aspect ratio is 11.7% lower than that of spherical particles. This research highlights the influence mechanism of particle morphology on landslide and tsunami dynamics, which provides a theoretical foundation for disaster prediction and assessment.

Hierarchical Arrangement of P(VDF-TrFE) Copolymer Crystals: A SAXS and AFM Study

P(VDF-TrFE) copolymers are materials with high relevance in printed organic electronics. These copolymers easily crystallize into the ferroelectric phase without resorting to post-deposition treatments (thermal annealing, poling, or mechanical stretching). The detection of a morphotropic phase boundary further increased the interest in this copolymer system by demonstrating relaxor behavior for higher TrFE content. This prompted an in-depth analysis of the P(VDF-TrFE) chiral chain structure responsible for the relaxor properties. Nevertheless, the efficient application of these materials also depends heavily on the quality and morphology of the crystalline domains. In this work, we combine SAXS and AFM imaging to analyze the structure of the crystalline domains as a function of the TrFE content. The detection of different structural distributions revealed the presence of hierarchical arrangements within the crystalline domains. Furthermore, these hierarchical arrangements were observed to change with the TrFE monomer content, presenting distinct morphologies for low and high TrFE contents, in line with previous works on the morphotropic phase boundary in these systems.

Modulating the assembly of starch-lecithin inclusion complexes and its underlying mechanism for controlling starch digestibility under the dense system

Starch-lipid inclusion complexes were used to regulate starch digestibility by changing the binding affinity of digestive enzymes such as α-amylase and α-glucosidase. However, when above a critical aggregation concentration (CAC) of starch and lipid molecules, they tended to self-assemble into double helices or normal micelles respectively, rather than interacting with each other to form starch-lipid complexes. Thus, how to enhance the complexation efficiency under a dense system is the key approach for the improvement of starch bioaccessibility and nutritional function. Herein, based on the dimethyl sulfoxide (DMSO) reverse solvent method, the effect of water/DMSO ratios and starch chain structures on the interaction and assembly behaviors between starch and lecithin molecules in high concentrations were systematically investigated. The results revealed that water/DMSO in a ratio of 1.5:1 promoted the interactions between cavities of starch helices and long alkyl chains of lecithin molecules, with higher level of complexed lecithin content, relative crystallinity (RC), enthalpy (ΔH) (Tp＞100°C), ordered-aggregation structures and resistant starch (RS) content. In this kind of solvent, starch samples with higher content of amylose and longer chains (degree of polymerization (DP) of B2 chains and B3+ chains) is advantageous to the formation of VII-type inclusion starch-lecithin complexes, with a rise in RS from 14.17% to 43.64%. It provided an effective method to modulate starch digestibility under the dense system of starch and lecithin via modulating the water/DMSO ratios and starch fine structures and lay the foundation for the large-scale preparation and application of starch-lecithin complexes.

A simple strategy to significantly improve the anticorrosion and aging resistance of epoxy coatings by adding polyaniline modified multi-walled carbon nanotubes

Epoxy coatings are widely used for corrosion protection of metals, but under extremely harsh environments, the epoxy polymer chains such as the C-O bonds of epoxy ether and aromatic ether, and the -OH in the epoxy chain structure can also undergo aging and degradation, leading to the failure of the coating in service. How to extend the anti-aging capability of epoxy resins while maintaining their other properties unchanged has become a major challenge in the practical application of epoxy coatings. In this study, the polyaniline (PANI) modified multi-walled carbon nanotubes (MWCNT@PANI) were synthesized by polymerization in-situ and added to epoxy resin as an anti-aging filler. The various measurements have been adopted to characterize the composition and structure of MWCNT@PANI, and the anticorrosive performance of the composite coating for carbon steel were evaluated via salt spray, chemical aging and UV light aging. Results showed that the impedance value of the blank epoxy coating decreases by at least two orders of magnitude after the salt spray tests, and the contact angle decreases by about 30° and gradually changes from hydrophobic to hydrophilic, indicating a significant decline in corrosion resistance. In contrast, the composite coating confirmed the excellent anti-aging performance, while the impedance values increased by approximately 2-5 orders of magnitude compared to that in blank epoxy coatings, and remained around 1010 Ω·cm2. Given the dense encapsulation of MWCNT@PANI, the dispersion stability between the filler and EP can be improved, and the effective corrosion resistance performance was also supported by molecular dynamic simulation. Besides that, the ability of free radical quenching along with the labyrinth effect and hydrophobic interaction have also been investigated to explain the anticorrosion and anti-aging mechanism.

Purification, characterization, and hypoglycemic activity of exopolysaccharides from Lactiplantibacillus plantarum MY04

As natural polymers, Lactiplantibacillus plantarum exopolysaccharides (EPS) possess a wide range of bioactivities but suffer from low yields and unclear relationships between functional activity and structure. To this end, the chemical structure and bioactive properties of EPS from Lactiplantibacillus plantarum MY04 were investigated. As a result, three polysaccharide fractions (EPS-1, EPS-2, EPS-3) were separated and purified, of which EPS-2 had better antioxidant activity and α-glucosidase inhibitory ability. More importantly, EPS-2 can significantly enhance insulin sensitivity in HepG2 cells by upregulating enzyme activities in the glycolytic pathway and mitigating oxidative stress-induced damage. In addition, the structural characterization of EPS-2 was also comprehensively elucidated. It was found that EPS-2 was mainly composed of mannose with a molecular weight of 2.3 × 106 Da, and its main chain structure is →3)-Manp-(1 → 2)-Manp-(1 → 2,6)-Manp-(1 → 2,6)-Manp-(1→, providing a theoretical basis for understanding the relationship between structure and function of polysaccharides.

Tracking research on the performance changes of S31042 steel under long term service

S31042 is widely used in ultra-supercritical units due to its excellent comprehensive performance at high temperatures. Tracking and monitoring research was conducted on as-received S31042 tubes and tubes in service for 13k hours, 31k hours, and 52k hours at 650 °C. The results show that as the service time increased, a large quantity of M23C6 phase precipitated along the grain boundaries, gathered and grew up into the bulk. This weakened of the grain boundaries, which facilitated crack propagation and significantly reduced the plasticity and toughness of the S31042 heat-resistant steel. After 13k hours of operation, the dispersion strengthening of the precipitated phase inside the grain and grain boundary led to a substantial increase in hardness, while there was no obvious change in strength. However, after 52k hours of operation, the dispersed precipitated phase within the grain slowly aggregated and grew, decreasing the effectiveness of dispersion strengthening. Consequently, both the high-temperature strength and hardness of the S31042 steel gradually decreased. As the service time increased, the continuously distributed and similarly sized M23C6 phases on the grain boundaries of S31042 developed into an inhomogeneous coarsening chain structure. Additionally, the appearance of nanoscale secondary NbCrN and M23C6 phases within the grain and their resulting precipitation strengthening effects were the main reasons for the significant change in S31042 hardness values. Based on these findings, the residual life of S31042 heat-resistant steel in service was predicted using an extrapolation method based on high-temperature creep rupture tests and the relationship model between hardness and the P function. A comparison of the L-M parametric life prediction results with the strength extrapolation life prediction results based on the standard creep rupture test shows that the creep rupture strength extrapolation method is slightly conservative. Therefore, the prediction results based on the hardness L-M parameter method, which is simple and easy to perform, can be used for preliminary life prediction.

Investigating single-chain structure during the crystallization process by atomic force microscopy

Crystalline polymers have gained significant traction in various fields owing to their exceptional thermal and mechanical properties. However, the precise mechanism underlying polymer crystallization remains a subject of ongoing debate. In this study, we employed atomic force microscopy (AFM)-based single-molecule force spectroscopy (SMFS), also called nanofishing to investigate the mechanical properties, chain-level structure, and interactions of individual polymer chains, thereby shedding light on the crystallization mechanism. Through control of the crystallization temperature and time of polyethylene oxide (PEO) in solution, in conjunction with differential scanning calorimetry (DSC), we present compelling evidence that polymer crystallization begins with the folding of individual chains into cluster-like forms and the subsequent aggregation of these clusters to form larger crystalline structures. The clusters adopt chain-folding structures with lengths ranging from 7.9 to 9.1 nm at distinct crystallization temperatures. Remarkably, we observed the formation of these clusters in the initial stages, even preceding the 5-min mark. Over time, these clusters progressively aggregate and grow, ultimately leading to lamella structures. This suggests that the primary chain-folding process occurs in the early stage of crystallization, presenting a significant advancement in our understanding of the behavior of polymers at the chain level during the crystallization process. These insights hold immense value in the design and development of advanced crystal-based polymer materials.

The Impact of Live E-commerce on Supply Chain Management: Challenges, Adaptations, and Strategic Optimizations

The explosive growth of live e-commerce has accelerated the transformation of supply chain management, where the efficiency and flexibility of the supply chain directly influence the success of live e-commerce. Therefore, optimizing supply chain management has become crucial for industry development. Live e-commerce, with its real-time interaction and instant purchasing characteristics, has profoundly impacted supply chain management. The rise of live e-commerce has driven supply chains to become more streamlined, personalized, and intelligent to meet consumer demands for freshness and customization of products. Additionally, the data-driven nature of live e-commerce enables better demand forecasting, reduces inventory backlogs, and enhances overall operational efficiency. This study explores the specific impacts of live e-commerce on supply chain management, including its effects on supply chain structure, logistics efficiency, inventory management, and the application of information technology. The aim is to provide strategic recommendations for supply chain optimization, helping enterprises enhance their competitiveness and promoting the healthy and sustainable development of the live ecommerce industry.

Analysis of the Morphological Characteristics of PM2.5 and Its Microbiological Composition in a Fattening Pig House

Particulate matter (PM2.5) in pig houses and the microorganisms in PM2.5 restrict the sustainable development of the pig industry and have a negative influence on environmental sustainability. This study aimed to investigate the morphological characteristics and diel microbial composition of PM2.5 in fattening pig sheds and explore how changes in the diel microbial composition of PM2.5 correlate with environmental factors and sources. To this end, environmental data from a fattening pig house were monitored, and PM2.5, feed, and faecal particles were examined using electron microscopy. Additionally, the bacterial and fungal assemblages contained in PM2.5 were analysed using 16S and 18S rRNA gene sequencing, respectively. The results showed that NH3, CO2, temperature, and relative humidity were significantly higher at night than during the day. PM2.5 particles from the fattening pig house exhibited different morphologies such as spherical, flocculent, and chain structures. The microbial diversity and bacterial assemblage showed significant variations, which were related to diel environmental factors in the fattening house. In addition, faeces may be the main source of airborne bacteria and feed may be the main source of airborne fungi in fattening houses. These findings provide a scientific basis for exploring the potential risks of the morphological characteristics of PM2.5 and its microbial composition to human and animal health. Additionally, they contribute to the sustainable development of the pig industry and the protection of the environment.

New ester-type chemical bonding wood adhesion with a dicarboxylic acid compound

Wood adhesion is one of the fundamental joint technologies for wood-based materials. We focused on an unprecedented chemical bonding wood adhesion. With the final goal of water-resistant wood adhesion using dicarboxylic acid compounds with straight alkyl chains, this study clarified the difference of adhesiveness between glutaric acid (GA) and citric acid (CA) to explore the direct effects of chemical bonding type adhesion on physical properties. In the prepared wood-based moldings, the structural analysis with 2D-NMR of the interphase between GA or CA and wood surfaces revealed that GA adhesion is cleaner and more reactive than CA adhesion, without any side reactions. GA reacted with the wood powder surface. In addition, the water resistance treatments of the GA-type wood-based molding showed a thickness reversibility that is not observed with CA-adhesion. The results indicate that GA-adhesion is very likely a chemical bonding type of wood adhesion, considering the molding process under high temperature and pressure conditions. The physical properties of the molding were evaluated to determine the adhesion properties. GA-type wood-based molding was tougher and more water-resistant than CA-type wood-based molding. The physical properties were attributed to the side-chain structure of GA. The results indicate that dicarboxylic acid compounds could be superior wood adhesives, and other dicarboxylic acids could be used for wood adhesion and the expression of material properties owing to their various side chain structures. Furthermore, the material properties could be controlled by considering the chemical structure of adhesive compounds in the future.

Adjusting the Coordination Configuration by Changing Electrostatic Potential: Introducing N/O/S Heteroatoms Based on the Electronic Effect.

Energetic coordination compounds (ECCs) have demonstrated unique advantages in regulating the physicochemical properties of energetic materials through the design of organic ligands. The fundamental approach involves altering the electron cloud density distribution of organic ligands to modify the characteristics of coordination sites and, thus, achieve new coordination configurations. In this study, Mulliken charge distribution and surface electrostatic potential analysis were used to elucidate the effects of pyridinic N, pyrrolic N, oxazolic O, and thiazolic S on the electron cloud density of carbohydrazide groups through the induction effect and conjugate effect. Furthermore, three AgClO4-based ECCs were synthesized based on 1H-imidazole-4-carbohydrazide, oxazole-4-carbohydrazide, and thiazole-4-carbohydrazide. Single-crystal X-ray diffraction analysis revealed that [Ag(IZ-4-CA)ClO4]n has a one-dimensional (1D) chain structure, while Ag2(OZCA)2(ClO4)2 and Ag2(SZCA)2(ClO4)2 exhibit zero-dimensional structures. The 1D structure, with good planarity, results in [Ag(IZ-4-CA)ClO4]n having lower mechanical sensitivity (IS = 21 J, FS = 80 N). The introduction of oxazolic O enhances oxygen balance (OB), leading to a higher predicted detonation velocity and pressure for Ag2(OZCA)2(ClO4)2 (D = 6.4 km s-1, P = 23.6 GPa). Although the introduction of thiazolic S is unfavorable for improving oxygen balance, Ag2(SZCA)2(ClO4)2 exhibits the highest initial decomposition temperature among the three, at 232 °C. Additionally, initiation tests demonstrated that three ECCs can successfully detonate cyclotrimethylenetrinitramine (RDX), indicating good initiation capabilities.

Facile Preparation of High-Performance Polythiophene Derivative and Effect of Torsion Angle Between Thiophene Rings on Electrochromic Color Change.

The electrochromic phenomenon of conducting polymer is mainly dominated by the π-π* band transition. The π conjugation is influenced by the coplanarity between polymer units, deviations from which can lead to an increased ionization potential and band gap values. In order to investigate the effect of plane distortion angle on electrochromic color in the main chain structure of polymerization, high-performance poly(3,3'-dimethyl-2,2'-bithiophene) (PDMeBTh) with a large plane distortion angle is successfully synthesized in boron trifluoride diethyl etherate (BFEE) by the electrochemical anodic oxidation method. The electrochemical and thermal properties of PDMeBTh prepared from BFEE and ACN/TBATFB are compared. The electrochromic properties of PDMeBTh are systematically investigated. The PDMeBTh shows a different color change (orange-yellow in the neutral state) compared to poly (3-methylthiophene) (light-red in the neutral state) due to the large torsion angle between thiophene rings of the main polymer chain. The optical contrast, response time, and coloring efficiency (CE) of the prepared PDMeBTh are also studied, which shows good electrochromic properties. For practical applications, an electrochromic device is fabricated by the PDMeBTh and PEDOT. The color of the device can be reversibly changed between orange-yellow and dark blue. The light contrast of the device is 27% at 433 nm and 61% at 634 nm. The CE value of the device is 403 cm2 C-1 at 433 nm and 577 cm2 C-1 at 634 nm. The constructed device also has good open circuit memory and electrochromic stability, showing good potential for practical applications.

The polysaccharides from blackened jujube with ultrasonic assistance extraction: Optimization of extraction conditions, antioxidant activity and structural analysis

Jujube is a widely grown agricultural product. In order to avoid the waste of resources and improve the added value of the blackened jujube, the blackened jujube was processed under certain temperature and humidity conditions. At present, there are relatively few researches on polysaccharides of blackened jujube. The selection of extraction method is very important for the study and utilization of plant polysaccharides. Ultrasonic assisted extraction technology has been widely used in polysaccharide extraction for its advantages of environmental protection, economy and high extraction rate. In order to fully tap the utilization potential of polysaccharides from blackened jujube, the ultrasonic assisted extraction technology of polysaccharides from blackened jujube was optimized. Based on the optimal conditions obtained by response surface analysis, the extraction rate of polysaccharide was as high as 12.75 ± 0.05%. The IC50 values of hydroxyl radical, DPPH radical and superoxide anion were 2.604 mg/mL, 0.754 mg/mL and 8.069 mg/mL, respectively. The blackened jujube polysaccharide (BJP) was mainly composed of rhamnose (Rha), arabinose (Ara), galactose (Gal) and galacturonic acid (Gal-UA), with a molecular weight of 1.42 × 106 Da, and the surface was a dense network structure with voids. The results showed that ultrasound-assisted extraction could extract polysaccharides more economically and efficiently. In this study, the polysaccharide extracted from blackened jujube has natural antioxidant effect, which may be related to the high content of galacturonic acid in polysaccharide and the molecular chain structure of polysaccharide can be destroyed by ultrasonic wave. As a kind of natural antioxidant, blackened jujube polysaccharide has important application value in functional products in food and medicine industries.

Environmental uncertainty, supply chain, and stability of sustainable green innovation:Based on micro evidence from energy-intensive enterprises

In the context of the low-carbon transformation of energy-intensive enterprises, the stability risks of continuous green innovation and their transmission mechanisms within the supply chain warrant attention. Specifically, will these stability risks be transmitted along the supply chain? If so, how are they transmitted? Therefore, this study focuses on Chinese energy-intensive enterprises and their upstream and downstream companies from 2008 to 2021. It explores the transmission effects of stability risks of continuous green innovation within the supply chain and the role of environmental uncertainty. By quantifying stability risk indicators of continuous green innovation and analyzing supply chain mechanisms, the study reveals the asymmetry of risk transmission and the directional and moderating effects of environmental uncertainty. The results indicate that stability risks of continuous green innovation primarily transmit upstream in the supply chain. Mechanism variables include financing constraints, degree of green transformation, and coordination of supply relationships. Additionally, the study finds that differences in supply structure contribute to heterogeneity in the transmission effect. These findings provide theoretical support for risk management strategies of energy-intensive enterprises in green innovation. It also provides practical guidance on strengthening coordination in green innovation and optimizing supply chain structure to reduce stability risk exposure.

Rectangular Carbon Nitrides C4N Monolayers with a Zigzag Buckled Structure: Quasi‐1D Dirac Nodal Lines and Weak Topological Properties with Flat Edge States

AbstractUsing first‐principles calculations, two C4N monolayers with a zigzag buckled (ZB) structure are proposed. The ZB C4N monolayers contain raised‐C (raised‐N) atoms with sp3 hybridization, different from the traditional 2D graphene‐like carbon nitride materials with sp2 hybridization. Interestingly, the band structures of the ZB C4N monolayers exhibit quasi‐1D Dirac nodal line resulting from the corresponding quasi‐1D structure of the zigzag carbon chains, which is essentially different from the conventional ring‐shaped nodal line. The quasi‐1D Dirac nodal line exhibits the following features: i) gapless Dirac points, ii) varying Fermi velocity, and iii) a slightly curved band along the high‐symmetry path. All these features are successfully explained by the proposed tight‐binding model that includes interactions up to the third nearest neighbor. The Fermi velocity of the 2D system can reach 105 m s−1, which is promising for applications in high‐speed electronic devices. The topological flat band structure of the corresponding 1D system determined by the Zak phase and band inversion is edge‐dependent, which is a weak topological state and can be explained by the 2D Su‐Schrieffer‐Heeger (SSH) model. The quasi‐1D Dirac Fermions and SSH edge states make the ZB C4N monolayers promising for nanoelectronics applications.