Serial Processing Research Articles

Large Scale 3D Printing: Influence of Fillers on Warp Deformation and on Mechanical Properties of Printed Polypropylene Components

AbstractAdditive manufacturing processes are still on the way from a prototyping process to an established serial production process. Often the limiting factors are the variety and costs of materials compared with standard materials. Polypropylene is a commonly used material in series production. The processing of polypropylene in additive‐ and extrusion‐based manufacturing processes is still a challenge. A big issue in pellet‐based large scale additive manufacturing of polypropylene is to achieve dimensional accuracy of the printed parts. Due to the semi‐crystalline nature of polypropylene and its low adhesive force on standard printing surfaces (aluminum) the fabricated parts tend to warp and deviate from the geometric shape. In this paper the influence of a melt adhesive and different filler types (glass fibers, glass bubbles, and talcum) on the warpage behavior of 3D printed polypropylene parts is investigated. Another issue in additive manufacturing is the mechanical properties of the fabricated parts compared to injection molded parts. The mechanical properties of 3D printed parts often show a dependency on the print direction, especially in case of using fillers with an anisotropic shape (fibers). In this study the influence of different fillers on mechanical properties and process indicated orientation is analyzed.

Development of auditory cognition in 5- to 10-year-old children: Focus on musical and verbal short-term memory.

Developmental aspects of auditory cognition were investigated in 5-to-10-year-old children (n=100). Musical and verbal short-term memory (STM) were assessed by means of delayed matching-to-sample tasks (DMST) (comparison of two four-item sequences separated by a silent retention delay), with two levels of difficulty. For musical and verbal materials, children's performance increased from 5 years to about 7 years of age, then remained stable up to 10 years of age, with performance remaining inferior to performance of young adults. Children and adults performed better with verbal material than with musical material. To investigate auditory cognition beyond STM, we assessed speech-in-noise perception with a four-alternative forced-choice task with two conditions of phonological difficulty and two levels of cocktail-party noise intensity. Partial correlations, factoring out the effect of age, showed a significant link between musical STM and speech-in-noise perception in the condition with increased noise intensity. Our findings reveal that auditory STM improves over development with a critical phase around 6-7 years of age, yet these abilities appear to be still immature at 10 years. Musical and verbal STM might in particular share procedural and serial order processes. Furthermore, musical STM and the ability to perceive relevant speech signals in cocktail-party noise might rely on shared cognitive resources, possibly related to pitch encoding. To the best of our knowledge, this is the first time that auditory STM is assessed with the same paradigm for musical and verbal material during childhood, providing perspectives regarding diagnosis and remediation in developmental learning disorders.

The working memory costs of a central attentional bottleneck in multitasking

When two (or more) tasks, each requiring a rapid response, are performed at the same time then serial processing may occur at certain processing stages, such as the response selection. There is accumulating evidence that such serial processing involves additional control processes, such as inhibition, switching, and scheduling (termed the active scheduling account). The present study tested whether the existence of serial processing in multitasking leads to a requirement for processes that coordinate processing in this way (active scheduling account) and, furthermore, whether such control processes are linked to the executive functions (EF) of working memory (WM). To test this question, we merged the psychological refractory period (PRP) paradigm with a WM task, creating a complex WM span task. Participants were presented with a sequence of letters to remember, followed by a processing block in which they had to perform either a single task or a dual task, and finally were asked to recall the letters. Results showed that WM performance, i.e. the amount of letters recalled in the correct order, decreased when performing a dual task as compared to performing a single task during the retention interval. Two further experiments supported this finding using manipulations of the dual task difficulty. We conclude that the existence of serial processing in multitasking demands additional control processes (active scheduling) and that these processes are strongly linked to the executive functions of working memory.

Isolation And Characterization Of Biosurfactant Producing Bacteria From Different Environmental Soil Samples

Isolation And Characterization Of Biosurfactant Producing Bacteria From Different Environmental Soil Samples

Towards All-optical Stochastic Computing Using Photonic Crystal Nanocavities

Stochastic computing allows a drastic reduction in hardware complexity using serial processing of bit streams. While the induced high computing latency can be overcome using integrated optics technology, the design of realistic optical stochastic computing architectures calls for energy efficient switching devices. Photonics Crystal (PhC) nanocavities are μm 2 scale devices offering 100fJ switching operation under picoseconds-scale switching speed. Fabrication process allows controlling the Quality factor of each nanocavity resonance, leading to opportunities to implement architectures involving cascaded gates and multi-wavelength signaling. In this paper, we investigate the design of cascaded gates architecture using nanocavities in the context of stochastic computing. We propose a transmission model considering key nanocavity device parameters, such as Quality factors, resonance wavelength, and switching efficiency. The model is calibrated with experimental measurements. We propose the design of XOR gate and multiplexer. We illustrate the use of the gates to design an edge detection filter. System-level exploration of laser power, bit-stream length and bit-error rate is carried out for the processing of gray-scale images. The results show that the proposed architecture leads to 8.5nJ/pixel energy consumption and 512ns/pixel processing time.

Free Energy Sampling to Explore Ion Solvation Environments and Understand Transport and Glass Transition in Solid State Electrolytes for Battery Materials

Molecular dynamics simulations using newly developed, accurate interaction potentials have helped elucidate possible mechanisms for various transport properties in systems of lithium salts dissolved in poly(ether-acetals) ( P(nEO-mMO) where EO is ethoxyl and MO is methoxyl ) that are prime candidates for solid state polymer electrolytes. The presence of a second coordination shell around the Li ion, observed in polymers that have MO groups, seems to distort the first coordination shell, creating a more open cage structure that may help facilitate transport in these polymers. Furthermore, this distorted coordination may also assist in the formation of a lower coordination transition state while the Li ions jump from one cage to another during diffusion. Free energy calculations further elucidate the relative stability of these different Li-ether coordination environments and the possible pathways to move between them (See figure 1 for example).Studies on poly(ether-acetals) also tell us that polymers with low glass transition temperature (Tg) are not necessarily the best foundation for high transport electrolytes as addition of salt may disproportionately increase Tg and reduce transport at comparable absolute temperatures. At battery working temperatures, PEO still exhibits superior ionic conductivity as compared to other polymers in this series due a smaller increase in glass transition with salt loading. Hence it is very important for practical applications to understand how salt loading affects the glass transition temperatures in these polymers and how we can tune it to our advantage. It was observed that the softness of the polymer chain controlled by the strength of the dihedral angles is an important parameter that has a significant effect on the glass transition and hence provide insight and tune further improved potentials. We will show the associated correlations of glass transition temperature in these systems with microscopic chemical details like the polymer backbone chemistry, ion clustering and coordination by extensively studying the trends in these different systems with extensive statistics from long time molecular dynamics simulations at different temperatures and compositions and understand transport at different timescales and help design new polymers electrolytes with improved transport at battery working temperatures. Figure 1: Pathways:2D Free energy analysis of Solvation of Li cation and TFSI anion in PEO and PEOMO. Coordination w/r to oxygens of ether/acetyl and oxygens of TFSI anions are used as collective variables a)Serial Process: PEO shows distinct stepwise pathways to move from one coordination state to another (arrows for guide showing TFSI forming a bond in the first step and then the polymer bond breaking in the second step b)Concerted Process: PEOMO shows a more direct path that implies bond breaking and forming happens in a more concerted way that allows for easier cation transport from one cage to another Figure 1

Quantifying the Generation Process of Multi-Level Tactile Sensations via ERP Component Investigation.

Humans obtain characteristic information such as texture and weight of external objects, relying on the brain's integration and classification of tactile information; however, the decoding mechanism of multi-level tactile information is relatively elusive from the temporal sequence. In this paper, nonvariant frequency, along with the variant pulse width of electrotactile stimulus, was performed to generate multi-level pressure sensation. Event-related potentials (ERPs) were measured to investigate the mechanism of whole temporal tactile processing. Five ERP components, containing P100-N140-P200-N200-P300, were observed. By establishing the relationship between stimulation parameters and ERP component amplitudes, we found the following: (1) P200 is the most significant component for distinguishing multi-level tactile sensations; (2) P300 is correlated well with the subjective judgment of tactile sensation. The temporal sequence of brain topographies was implemented to clarify the spatiotemporal characteristics of the tactile process, which conformed to the serial processing model in neurophysiology and cortical network response area described by fMRI. Our results can help further clarify the mechanism of tactile sequential processing, which can be applied to improve the tactile BCI performance, sensory enhancement, and clinical diagnosis for doctors to evaluate the tactile process disorders by examining the temporal ERP components.

From family commitment to entrepreneurial orientation: exploring the role of cultural mechanisms in mature family firms

At a stage of life cycle maturity, the unique advantages of family influence are often outweighed by organizational conditions of conflict, risk-aversion, and inertia which makes it difficult to exploit entrepreneurial opportunities. Guided by the proposition that a positive culture enables the entrepreneurial spirit to be preserved over time, this study focuses on examining the cultural dynamics between family and business social systems to advance our understanding of the heterogeneity of mature family firms in terms of entrepreneurial orientation (EO). Specifically, it bridges the link between family commitment and firm-level EO by considering long-term orientation and stewardship climate to operate as organizational culture mechanisms. From a quantitative study of 208 family firms, the findings provide evidence for EO to be supported by the proposed serial mediation process. A family’s strong commitment toward the business thus seems to stimulate EO only when passing through long-term-oriented priorities among the firm’s dominant coalition and an organizational environment characterized by collective stewardship.

Physics of large-area pulsed laser powder bed fusion

The build rate of powder bed additive manufacturing could be significantly accelerated if consolidation of metal powders evolved from a serial process to a parallel process. In this work, the physics of Large-Area pulsed laser Powder Bed Fusion (LAPBF) in 316L stainless steel was studied through high speed imaging and high-fidelity physics simulations. Laser pulses were found to rapidly melt the metal powder, with subsequent fast coalescence of the melted particles into larger droplets. Conduction of heat from the molten droplets melted the substrate surface, and the molten droplets then spread out over roughly 100 μs. For the laser and metal powder parameters used in this study, layer thicknesses of greater than 40 µm resulted in uneven distribution of added material onto the substrate surface and thus an increase in porosity in multilayer prints. Simulations showed that pit features could be created (that can result in pores) from overlying powder particles shadowing the underlying substrate and blocking sufficient laser energy to deposit into the substrate. Simulations suggested that for these laser and powder parameters using thinner powder layers would reduce shadowing and allow the laser pulse to effectively heat the substrate thereby mitigating the defect formation. Implementing this change ultimately demonstrated > 99.5% density in the simulation, and > 99.8% density experimentally in 316L stainless steel prints. During the LABPF process very little material ejection was observed, a known impediment to laser powder bed fusion scaling to larger volume part production. This absence of eject a suggests that LAPBF may be able to produce material with high quality, suitable for critical applications, and scalable to high volume production.

„Path‟ and „Manner‟ in The Serialization of Motion Verbs

Verbs are one of the most basic vocabulary elements of the language. These words express the being, manners and movements of beings in the universe. However, in order to express the movements of living and non-living beings in the universe, the verb category creates syntactic and semantic situations by performing some combinations within itself. Because the many movements of many beings in the universe cause endless combinations to appear. In order to express this, the verb category creates various combinations within itself. The most typical example of this is seen between motion verbs, which is a semantic class, and serial verb structures, which are a syntactic and semantic class. Although there have been various studies on motion verbs, the limits of these verbs have not been determined in Turkish studies. Motion verbs, which can be considered as verbs expressing the displacement of beings in the universe, are closely related to serial verb structures, which is a syntactic and semantic category. Serial verb structures contain at least one motion verb in surface or deep structure. According to Talmy's typology, these verbs of motion mark the "way" where the movement takes place, or the "style", which is the way it takes place. In this study, the roles of "path" and "manner" in the serialization process of motion verbs are discussed in the Turkish context.

Eye-movements reveal the serial position of the attended item in verbal working memory.

The problem of how the mind can retain sequentially organized information has a long research tradition that remains unresolved. While various computational models propose a mechanism of binding serial order information to position markers, the representational nature and processes that operate on these position markers are not clear. Recent behavioral work suggests that space is used to mark positions in serial order and that this process is governed by spatial attention. Based on the assumption that brain areas controlling spatial attention are also involved in saccadic planning, we continuously tracked the eye-movements as a direct measure of the spatial attention during retrieval from a verbal WM sequence. Participants memorized a sequence of auditory numbers. During retention, they heard a number-cue that did or did not belong to the memorized set. After this number-cue, a target-beep could be presented to which they had to respond if the number-cue belonged to the memorized sequence. In Experiment 1, the target-beep was either presented to the left or right ear, and in Experiment 2 bilaterally (removing any spatial aspect). We tested the hypothesis that systematic eye-movements are made when people retrieve items of sequences of auditory words and found that the retrieval of begin items resulted in leftward eye-movements and the retrieval of end items in rightward eye-movements. These observations indicate that the oculomotor system is also involved in the serial order processes in verbal WM thereby providing a promising novel approach to get insight into abstract cognitive processes.

Ferrowax microvalves for fully automated serial dilution on centrifugal microfluidic platforms.

We herein describe a centrifugal microfluidic system to accomplish a fully automated serial dilution. The liquid flow on the disc was regulated by utilizing ferrowax microvalves systematically integrated into the channels within specially designed metering structures. By opening the differently positioned microvalves through irradiation of IR laser to allow metering, the same amount of diluent was serially eluted to the dilution chamber from the same diluent chamber. After dilution, the diluted samples were automatically delivered to the respective final product chambers by appropriately opening or closing the microvalves in the connecting channels, followed by rotating the disc. Based on this unique design principle, six consecutive two-fold and 10-fold dilutions were successfully achieved, yielding excellent accuracy in a wide dynamic range up to six orders of magnitude. Very importantly, the overall serial dilution process, including the diluent addition, mixing, and product transfer steps, was completed very rapidly within 5 min, due to the minimized procedures enabled by the automated actuation of the ferrowax microvalves at the rationally designed positions. We expect our centrifugal microfluidic system would serve as a powerful elemental tool to realize fully automated diagnostic microsystems involving the serial dilution process.

Features of the process of hot extrusion of blanks of the rotor blades of a GTE compressor

Purpose. Improving the quality of manufacturing of blanks for compressor rotor blades by hot extrusion.
 Research methods and equipment. The research was carried out using a crank press with a force of 1000 kN, in split dies in accordance with a serial technological process.
 The dies were heated up to 150 ... 200 °С, to improve the work when extruding the blanks of the rotor blades made from the titanium alloy ВT8.
 The thickness of the copper coating was measured with an ИTMП-3 magnetic induction device with an error of ± 2 μm.
 X-ray spectral microanalysis was performed on an ISM-6360ALA scanning microscope.
 The billets were heated in an MП-2В furnace.
 Results. It has been established that the quality of blade blanks made of ВT8 titanium alloy obtained by hot extrusion is influenced by the state of the copper coating, which is preliminarily applied to the surface of the original blank.
 When the initial blanks are heated, copper is oxidized and in the temperature range of 250…700 °С the oxidation rate proceeds according to a linear pattern, and after 700…750 °С – according to a parabolic pattern.
 Oxidation of the copper coating occurs unevenly not only within one workpiece, but also within the batch, which leads to a decrease in durability and deterioration of the surface quality of the blade workpieces obtained by hot extrusion.
 Research carried out by X-ray spectral microanalysis of the copper coating revealed the presence of aluminum oxides of varying degrees of dispersion.
 The source of this material in the copper coating is caricature of corundum used in blowing into the surface of the billet, which is the reason for the appearance of scoring on the blade blank.
 It was also found that longitudinal marks on the blade are a consequence of the appearance of a matrix of tubercles (sagging) on the working surface of the die, caused by the adhesion of the deformable material of the blade to the base metal of the tool.
 Scientific novelty. The regularity of the influence of the heating temperature of the initial blank of the blade on the oxidation rate of the copper coating has been established. The mechanism of the influence of the oxidation of the copper coating and the adhesion of contacting materials during hot extrusion on the surface condition of the resulting blanks is disclosed.
 Practical value. The results obtained make it possible to improve the quality of the manufactured blanks of the compressor rotor blades by hot extrusion.

Job Insecurity and Job Performance: A Serial Mediated Relationship and the Buffering Effect of Organizational Justice.

The study aimed to extend the current knowledge of the relationship between job insecurity and performance. In line with traditional stress theories, work-family and burnout were hypothesized as serial mediators of the negative link between job insecurity and job performance. Also, the current study hypothesized that the association between job insecurity and the mediators [i.e., Work-family conflict (WFC) and burnout] could be buffered by perceived organizational justice among employees. Therefore, we empirically tested a moderated serial mediation model. Participants were 370 employees of an Italian multiservice social cooperative. Data were collected using a self-report questionnaire in the aftermath of the COVID-19 pandemic outbreak. The obtained results indicated that WFC and burnout mediated the association between job insecurity and job performance. Furthermore, perceived organizational justice buffered the relationship between job insecurity and WFC. Concerning job burnout, the association with job insecurity was moderated only among employees perceiving medium and high levels of organizational justice. The moderated serial mediation index provided support to the role of organizational justice in decreasing the association between job insecurity and job performance. This study delves deeper into the variables explaining the relationship between job insecurity and job performance by testing a serial process mechanism that involved WFC and burnout. Additionally, the obtained results provide suggestions to organizations and managers regarding the protective role of organizational justice to sustain employees’ mental health and performance. Practical implications at the organizational and managerial level are provided, along with a focus on the actual impact of the pandemic.

Configuration and Emplotment: Converging or Opposite Paradigms for Storytelling?

Abstract Reflecting on Paul Ricoeur's discussion of historical configuration and fictional emplotment, this article proposes to actualize his model to oppose two prototypes of narrativity, which form two poles between which narrative representations extend. Instead of basing these prototypes on narrative genres such as historiography and fiction, it compares the configuration of narratives designed to inform readers about the signification of a past event with the emplotment of narratives aiming to immerse readers in a simulated past or a fictive storyworld. While contemporary narratology has been mostly concerned with the latter case, we will see that a comparison between narratives belonging to these two poles can help us better understand the functioning of narrative texts, most of them situated between these two extremes. Drawing on stories of a plane crash found in daily newspapers and magazines, the article shows that news stories usually favor the informative function, but when an event cannot be fully told, information enters a process of serialization, leading to the emergence of a “natural” plot. This leads to the conclusion that artificial emplotment is an imitation of prefiguration rather than the triumph of concordance.

Role of Virus-Related Chronic Inflammation and Mechanisms of Cancer Immune-Suppression in Pathogenesis and Progression of Hepatocellular Carcinoma

Simple SummaryHepatocellular carcinoma pathogenesis is dependent on a chronic inflammation caused by several factors, including hepatotropic viruses, such as HCV and HBV. This chronic inflammation is established in the context of the immunotolerogenic environment peculiar of the liver, in which the immune system can be stimulated by HCV and HBV viral antigens. This complex interaction can be influenced by direct-acting antiviral drug treatments, capable of (almost totally) rapidly eradicating HCV infection. The influence of anti-viral treatments on HCC pathogenesis and progression remains to be fully clarified.Hepatocellular carcinoma (HCC) can be classified as a prototypical inflammation-driven cancer that generally arises from a background of liver cirrhosis, but that in the presence of nonalcoholic steatohepatitis (NASH), could develop in the absence of fibrosis or cirrhosis. Tumor-promoting inflammation characterizes HCC pathogenesis, with an epidemiology of the chronic liver disease frequently encompassing hepatitis virus B (HBV) or C (HCV). HCC tumor onset and progression is a serial and heterogeneous process in which intrinsic factors, such as genetic mutations and chromosomal instability, are closely associated with an immunosuppressive tumor microenvironment (TME), which may have features associated with the etiopathogenesis and expression of the viral antigens, which favor the evasion of tumor neoantigens to immune surveillance. With the introduction of direct-acting antiviral (DAA) therapies for HCV infection, sustained virological response (SVR) has become very high, although occurrence of HCC and reactivation of HBV in patients with co-infection, who achieved SVR in short term, have been observed in a significant proportion of treated cases. In this review, we discuss the main molecular and TME features that are responsible for HCC pathogenesis and progression. Peculiar functional aspects that could be related to the presence and treatment of HCV/HBV viral infections are also dealt with.

An accelerated architecture of change‐point detection for FMCW radar mutual interference based on FPGA

SummaryThe mutual interference between frequency modulated continuous wave (FMCW) radars seriously affects autonomous driving. The interference will cause a short‐duration pulse‐like signal, which contains several change points in the time domain. The change‐point detection method called bottom‐up segmentation (BOTUP) is applied to deal with a short duration pulse‐like signal, which has excellent detection accuracy. However, the serial processing of BOTUP will cause considerable delay, which is not conducive to real‐time detection of automatic driving. In this paper, an accelerated architecture of BOTUP (ACC‐BOTUP) based on field‐programmable gate array (FPGA) is proposed. As BOTUP has segmented characteristics and without data dependency between the cost functions, a parallel structure is proposed to reduce the latency. Further, a pipeline structure is proposed to execute the operations of the cost functions in an overlapping manner. Compared with the original BOTUP (O‐BOTUP), the latency of ACC‐BOTUP is reduced by 82%, which is more suitable for real‐time detection in autonomous driving.

Serial Cracking in 2D Van der Waals Layered Electrodes Mediated by Electrochemical Reaction and Mechanical Deformation

In battery cycling, mechanical effects introduced by electrochemical reactions are commonly observed. In return, the mechanical deformations also have a large impact on the electrochemical process. However, such a coupling effect of electrochemical reaction and mechanical deformation has a complicated interplay on the atomic scale and an explicit elucidation is still challenging. Herein, we used in situ transmission electron microscopy to directly visualize the coupling process during the lithiation of two-dimension Van der Waals MoS 2 layered electrodes. A self-sustained cracking mechanism was identified; the first crack was created by the accumulation of the linear defects originated from the strain in lithiation. The formed defects including dislocations and antiphase boundaries, in turn accelerated the Li-ion diffusion, promoting the electrochemical reaction and cooperatively gave rise to the formation of a second and following cracks that resembled the “avalanche effect”. Meanwhile, it is observed that a threshold crystal size exists, under which the lithiation stress is not sufficient to initiate the first crack, and thus the serial cracking process could be avoided. The present work provides an atomistic insight into a cooperation from the mechanical and electrochemical effects toward the formation of the arrayed cracks. It also sheds light on the enhancement of mechanical properties of layered electrode materials for rechargeable batteries.

Biological Characterization and Evolution of Bacteriophage T7-△holin During the Serial Passage Process.

Bacteriophage T7 gene 17.5 coding for the only known holin is one of the components of its lysis system, but the holin activity in T7 is more complex than a single gene, and evidence points to the existence of additional T7 genes with holin activity. In this study, a T7 phage with a gene 17.5 deletion (T7-△holin) was rescued and its biological characteristics and effect on cell lysis were determined. Furthermore, the genomic evolution of mutant phage T7-△holin during serial passage was assessed by whole-genome sequencing analysis. It was observed that deletion of gene 17.5 from phage T7 delays lysis time and enlarges the phage burst size; however, this biological characteristic recovered to normal lysis levels during serial passage. Scanning electron microscopy showed that the two opposite ends of E. coli BL21 cells swell post-T7-△holin infection rather than drilling holes on cell membrane when compared with T7 wild-type infection. No visible progeny phage particle accumulation was observed inside the E. coli BL21 cells by transmission electron microscopy. Following serial passage of T7-△holin from the 1st to 20th generations, the mRNA levels of gene 3.5 and gene 19.5 were upregulated and several mutation sites were discovered, especially two missense mutations in gene 19.5, which indicate a potential contribution to the evolution of the T7-△holin. Although the burst size of T7-△holin increased, high titer cultivation of T7-△holin was not achieved by optimizing the culture process. Accordingly, these results suggest that gene 19.5 is a potential lysis-related component that needs to be studied further and that the T7-△holin strain with its gene 17.5 deletion is not adequate to establish the high-titer phage cultivation process.

Language acquisition of early sequentially bilingual children is moderated by short-term memory for order in developmental language disorder: Findings from the HelSLI study.

The role of domain-general short-term memory (STM) in language development remains controversial. A previous finding from the HelSLI study on children with developmental language disorder (DLD) suggested that not only verbal but also non-verbal STM for temporal order is related to language acquisition in monolingual children with DLD. To investigate if a similar relationship could be replicated in a sample of sequentially bilingual children with DLD. In addition to the effect of age, the effect of cumulative second language (L2) exposure was studied. Sixty-one 4-6-year-old bilingual children with DLD and 63 typically developing (TD) bilingual children participated in a cross-sectional study conducted in their L2. Children completed novel game-like tests of visual and auditory non-verbal serial STM, as well as tests of cognitive functioning and language. Interactions of STM for order with age and exposure to L2 (Finnish) were explored as explanatory variables. First, the improvement of non-verbal serial STM with age was faster in sequentially bilingual TD children than in bilingual children with DLD. A similar effect was observed for L2 exposure. However, when both age and exposure were considered simultaneously, only age was related to the differential growth of non-verbal STM for order in the groups. Second, only in children with DLD was better non-verbal serial STM capacity related to an improvement in language scores with age and exposure. The results suggest that, as previously found in Finnish monolingual children, domain-general serial STM processing is also compromised in bilingual children with DLD. Further, similar to the monolingual findings, better non-verbal serial STM was associated with greater language improvement with age and exposure, but only in children with DLD, in the age range studied here. Thus, in clinical settings, assessing non-verbal serial STM of bilingual children could improve the detection of DLD and understanding of its non-linguistic symptoms. What is already known on the subject Both phonological and non-verbal STM have been associated with DLD in monolingual and sequentially bilingual children. Monolingual children with DLD have also shown slower non-verbal serial STM development than TD children. What this study adds to existing knowledge Sequentially bilingual TD children's non-verbal serial STM improves more between ages 4 and 7 years than that of their peers with DLD, replicating a finding for monolingual children with DLD. Better non-verbal serial STM was especially associated with early receptive language development in sequentially bilingual children with DLD. L2 exposure showed largely comparable effects with age. These results support the hypothesis that a domain-general serial STM deficit is linked to DLD. What are the potential or actual clinical implications of this work? Non-verbal assessment of STM for serial order in sequentially bilingual children with DLD could benefit the development of better tailored therapeutic interventions.