Absorptive Model Research Articles

Monitoring of absorptive model biogas purification process using sensor matrices and gas chromatography

This study examined the process of purifying model biogas using a new type of absorbent based on a Deep Eutectic Solvent (DES) and a commercially available absorbent (Genosorb) to remove acetone, toluene, and cyclohexane. The main aim of the research was to control the purification efficiency using gas chromatography (GC) and an alternative method based on sensor matrices (SM). As a result of comparing the multidimensional SM signals with the GC result, the lowest difference between SM and GC (3.69%) was achieved with the DES. When using Genosorb, the differences between the methods were slightly more pronounced, reaching 10.26%. The studies also confirmed that SM results showed significant agreement, accuracy, precision, and equivalence compared to GC results. Nowadays, the literature has not reported this issue. The presented research fills the current gap in the literature and contributes to the development of knowledge in the practical application of SM.

Contemporary Management Practice Applying the Dynamic Absorptive Capacity Measurement Model (PM4AC) for Improved Business Sustainability

The Colombian industrial sector faces various problems, such as contributing to the development of business and innovation capacities to overcome the difficulties associated with poverty, low competitiveness and low complexity. A key challenge is to develop mechanisms that allow companies to adapt to a globalized competitive environment. In this regard, projects and their management represent an opportunity for greater flexibility. This work presents a model developed to quantify dynamic absorption, understood as the ability to identify the value of new external knowledge, absorb it as internal knowledge and apply it to serve business purposes. The measured indicator is adapted to a dynamic organization environment and provides a project with the ability to interact with and monitor variables. For modeling, variables observed across 148 small and medium-sized enterprises (SMEs), belonging to Colombian organizations, were collected using questionnaires and structural equation modeling (SEM) to determine analysis dimensions, and subsets of dynamic absorptive capacity as latent variables from this information. The dynamic absorptive capacity measurement model (PM4AC) describes a normalized fit index (NFI), comparative fit index (CFI) and RMSEA of 0.935, 0.986 and 0.042, correspondingly. The contribution of this model is designed to improve and make available a new framework of business sustainability leadership, using the PM4AC tool. Finally, the objective of this study is to provide a model developed to quantify the dynamic absorption capacity for SMES. Furthermore, as most of the research involves technology firms, we seek to better understand the business sustainability in SMEs.

Photothermal Responsivity of van der Waals Material-Based Nanomechanical Resonators.

Nanomechanical resonators made from van der Waals materials (vdW NMRs) provide a new tool for sensing absorbed laser power. The photothermal response of vdW NMRs, quantified from the resonant frequency shifts induced by optical absorption, is enhanced when incorporated in a Fabry–Pérot (FP) interferometer. Along with the enhancement comes the dependence of the photothermal response on NMR displacement, which lacks investigation. Here, we address the knowledge gap by studying electromotively driven niobium diselenide drumheads fabricated on highly reflective substrates. We use a FP-mediated absorptive heating model to explain the measured variations of the photothermal response. The model predicts a higher magnitude and tuning range of photothermal responses on few-layer and monolayer NbSe2 drumheads, which outperform other clamped vdW drum-type NMRs at a laser wavelength of 532 nm. Further analysis of the model shows that both the magnitude and tuning range of NbSe2 drumheads scale with thickness, establishing a displacement-based framework for building bolometers using FP-mediated vdW NMRs.

Scattering angle dependence of temperature susceptivity of electron scattering in scanning transmission electron microscopy

The sensitivity of electron scattering to sample temperature (T) as a function of the scattering angle in scanning transmission electron microscopy (STEM) is investigated. Thermal vibration of atoms in crystal lattice results in attenuated Bragg reflections and a diffuse background in electron diffraction patterns, which have direct implications on STEM images. The scattering intensities at higher angle are known to be dominated by thermal diffuse scattering (TDS) and the column intensity is expected to have a negative correlation with increasing T because of the disrupted channeling, but the T susceptivity of the scattering intensity at smaller angles is less known. Our experiment shows that the T dependency of annular averaged diffraction intensity inverts its sign two times outside the direct beam, and the T sensitivity varies significantly as a function of scattering angle. The intensity shows a positive correlation with increasing T at the low to intermediate angular ranges before it returns to the negative correlation at the higher angle range. A reasonable agreement is found between the experimental data and multislice simulation data. Absorptive model is used to provide theoretical insights into the observed trends. Similar inversions of T dependency of column intensities are also observed in experimental and simulated atomic-resolution STEM images. The findings provide an important implication to the precise quantification of local T at high spatial resolution by optimizing the collection angles in STEM.

The absorptive capacity process: an exposition and update

PurposeThis study investigates the development of absorptive capacity. Using an integrated cognitive learning perspective, this study provides empirical evidence about the conceptual absorptive capacity model through examining the full process step by step. Two groups of moderating variables were studied—namely, social integration and appropriability—to examine their impact on the process.Design/methodology/approachThis study employed a longitudinal study from a community service program (Kuliah Kerja Nyata) at Universitas Gadjah Mada, Yogyakarta, Indonesia, by using surveys at the beginning and the end of the project. Of 492 teams from 2,444 students participated in the study. Each individual within a team had at least one project assigned to him/her during the project. The absorptive capacity process was examined through six consecutive models and analysed using hierarchical linear modelling. The moderating variables were tested using the Moderated Regression Analysis and Wald tests.FindingsThe study confirms the full cycle of absorptive capacity as an independent, dynamic and complex process; it involves acquiring, assimilating, transforming and exploiting sequencing variables from the individual level to the team level and vice versa using feed-forward and feedback mechanisms adopted from the 4I framework of organisational learning. However, the roles of the moderating variables are still inconclusive due to some possible factors, which were also reflected by the U-phenomenon.Originality/valueThis study provides vital support to the learning theory as well as to the organisation learning concept. This study also reveals empirical evidence about the unsupported moderating variables behave during a project cycle, such as what they function, how they evolve and what we should do about the moderating factors during a project. The findings of this study provide practical suggestions and highlight areas for future research.

PAHs, PCBs and organochlorine pesticides in the atmosphere of Eastern Mediterranean: Investigation of their occurrence, sources and gas-particle partitioning in relation to air mass transport pathways

Thirty-four air samples were collected from 2013 to 2015, at a semi-rural site in Eastern Mediterranean (Island of Crete), to study the atmospheric occurrence of polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs) and organochlorine pesticides (OCPs) in the gas and particulate phase. Average levels (gaseous and particulate phase) of PAHs (36 compounds, 11–18 ng/m3), PCBs (49 congeners, 77–93 pg/m3) and OCPs (23 substances, 77–140 pg/m3) were comparable to those reported for similar locations worldwide. Multiple-linear regression analysis, performed to relate atmospheric concentrations with meteorological conditions, revealed as main controlling factors local sources for PAHs and long-range transport (LRT) for PCBs and OCPs. The consideration of parent-metabolite ratios for most OCPs excluded fresh inputs. The application of the potential source contribution function (PSCF) identified Black Sea and eastern Balkans as likely sources for PCBs and OCPs. Significant linear correlations (R2 = 0.79–0.98) were determined between the partitioning coefficients (logKp) and partial vapor pressures (logPL0) for most air samples for PAHs and PCBs excepting OCPs. Slope mr values were close to −1 for PAHs and OCPs indicating gas/particle partitioning close to equilibrium. The corresponding mr values for PCBs were shallower (<-0.60) denoting non-equilibrium conditions and potential sampling artefacts. The octanol-air partition coefficient absorption model, logKp-logKoa, did not offer robust evidence for the evaluation of the atmospheric partitioning of the studied compounds. Experimentally determined particle fractions (ϕ) fitted better with the typical remote and rural curves as predicted by the Junge-Pankow model for most PAHs and PCBs but not for OCPs. The Koa-fom absorptive model could not adequately simulate the measured ϕ values for the majority of the compounds.

Ezetimibe impairs transcellular lipid trafficking and induces large lipid droplet formation in intestinal absorptive epithelial cells

Ezetimibe inhibits Niemann-Pick C1-like 1 (NPC1L1) protein, which mediates intracellular cholesterol trafficking from the brush border membrane to the endoplasmic reticulum, where chylomicron assembly takes place in enterocytes or in the intestinal absorptive epithelial cells. Cholesterol is a minor lipid constituent of chylomicrons; however, whether or not a shortage of cholesterol attenuates chylomicron assembly is unknown. The aim of this study was to examine the effect of ezetimibe, a potent NPC1L1 inhibitor, on trans-epithelial lipid transport, and chylomicron assembly and secretion in enterocytes. Caco-2 cells, an absorptive epithelial model, grown onto culture inserts were given lipid micelles from the apical side, and chylomicron-like triacylglycerol-rich lipoprotein secreted basolaterally were analyzed after a 24-h incubation period in the presence of ezetimibe up to 50 μM. The secretion of lipoprotein and apolipoprotein B48 were reduced by adding ezetimibe (30% and 34%, respectively). Although ezetimibe allowed the cells to take up cholesterol normally, the esterification was abolished. Meanwhile, oleic acid esterification was unaffected. Moreover, ezetimibe activated sterol regulatory element-binding protein 2 by approximately 1.5-fold. These results suggest that ezetimibe limited cellular cholesterol mobilization required for lipoprotein assembly. In such conditions, large lipid droplet formation in Caco-2 cells and the enterocytes of mice were induced, implying that unprocessed triacylglycerol was sheltered in these compartments. Although ezetimibe did not reduce the post-prandial lipid surge appreciably in triolein-infused mice, the results of the present study indicated that pharmacological actions of ezetimibe may participate in a novel regulatory mechanism for the efficient chylomicron assembly and secretion.

Moderating Effects of Transforming High-Potential Local Employees for Reverse Adaptation, through the Lens of Absorptive Capacity: The Case of Hi Tech in Egypt

The purpose of this research is to provide new insights into the moderating effects that enable an MNE operating in Egypt to learn to attract, motivate, transform and develop its high-potential local employees for reverse adaptation so as to fit a global mind-set elsewhere in the organisation&amp;rsquo;s global positions. The methodology uses semi-structured story-based interviews to explore the significance of moderating effects and practices of absorptive capacity and reverse adaptation in Hi Tech in Egypt. The findings reveal the interrelated components that lead to reverse adaptation and how continuous management development is intermediated by learning and well-bonded reciprocity of relationships, amid continuous management development, transformation, and reverse adaptation. This virtuous cycle acts as an integrated adaptation learning loop that supports the process of transformation. The findings refute the linearity of the absorptive capacity model as the transformation stage does not appear to mediate the model but precedes other steps within it. Moreover, it was concluded that the model did not end in achieving the competitive advantage phase. Instead reverse adaptation, as a by-product, acted as a trigger for knowledge acquisition. The originality here is based on a greater understanding of the moderating effects that mediate the relationship between reverse adaptation and the transformation stage of absorptive capacity theory. This allows awareness of how, in the case of the Hi Tech in Egypt, the global mindset is delivered and offers valuable contributions to theory and practice. As reverse adaptation is a nascent multidisciplinary phenomenon for research, the paper also suggests a research agenda for researchers in the area of international management.

Zahra and George (2002) の知識吸収能力モデルは有効か

Zahra and George (2002) の知識吸収能力モデルは有効か

Holographic response characteristics influenced by an absorptive diffusion polymerization model in bulk TI/PMMAs.

Dynamic formation of a volume holographic grating is mainly caused by the diffusion polymerization of a photoinitiator in TI/poly-(methyl methacrylates) (PMMAs). Here, we consider the time-dependent absorption coefficient in this material to establish an absorption modulated diffusion polymerization model. An experimental and theoretical investigation in TI/PMMAs with different sample thicknesses (1-3 mm) is presented. It is indicated that the thickness can regulate the holographic sensitivity and constancy in TI/PMMAs. Furthermore, we also examined the dark diffusion process, multiplexed gratings recording, pre-exposure holographic enhancement, and long-term full exposure in TI/PMMAs with different thicknesses to analyze their holographic sensitivity and constancy. It is predicted that, in general, the absorption characteristics in TI/PMMA can be further affected by changing its thickness, thus it is able to satisfy different requirements in high-density holographic memories.

Assessments of seasonal trend, gas–particle partitioning and deposition flux of polycyclic aromatic hydrocarbons at a semi-rural site

Air samples were collected at a semi-rural area between February 2013 and February 2014 to determine the concentrations and gas/particle partitionings of polycyclic aromatic hydrocarbons (PAHs). The sampling was done with a high volume air sampler to cover four seasons and 40 samples were taken. Each sample period was about 24 h. The gas–particle partition coefficients (Kp) of PAHs were calculated and correlated with their subcooled liquid vapor pressures (). The determined slopes (mL) varying from –0.59 to –0.28 were far from the theoretical value (–1) due to the absorption, the dominant mechanism. Experimentally determined Kp values were compared with the results obtained using the octanol–air and soot–octanol partitioning models. An octanol-based absorptive partitioning model resulted in a better prediction than the soot–octanol based partitioning model. The total (gas + particle) PAH concentrations changed between 6 and 798 ng m−3 with an average of 205 ± 236 ng m−3. According to Clausius–Clapeyron equation, the local PAH sources were effective. The diagnostic ratios indicated that coal and wood-burning, and traffic emissions were the dominant PAH sources. Dry deposition fluxes for gas and particle phase were also estimated using documented dry deposition velocities and mass transfer coefficients in the literature and concentrations measured in this study.

Potentially Important Contribution of Gas-Phase Oxidation of Naphthalene and Methylnaphthalene to Secondary Organic Aerosol during Haze Events in Beijing.

Naphthalene (Nap) and methylnaphthalene (MN) are the most abundant polycyclic aromatic hydrocarbons (PAHs) in atmosphere and have been proposed to be important precursors of anthropogenic secondary organic aerosol (SOA) derived from laboratory chamber experiments. In this study, atmospheric Nap/MN and their gas-phase photooxidation products were quantified by a Proton Transfer Reaction-Quadrupole interface Time-of-Flight Mass Spectrometer (PTR-QiTOF) during the 2016 winter in Beijing. Phthalic anhydride, a late generation product from Nap under high-NO x conditions, appeared to be more prominent than 2-formylcinnamaldehyde (early generation product), possibly due to more sufficient oxidation during the haze. 1,2-Phthalic acid (1,2-PhA), the hydrated form of phthalic anhydride, was capable of partitioning into aerosol phase and served as a tracer to explore the contribution of Nap to ambient SOA. The measured fraction in particle phase ( Fp) of 1,2-PhA averaged at 73 ± 13% with OA mass loadings of 52.5-87.8 μg/m3, lower than the value predicted by the absorptive partitioning model (100%). Using tracer product-based and precursor consumption-based methods, 2-ring PAHs (Nap and MN) were estimated to produce 14.9% (an upper limit) of the SOA formed in the afternoon during the wintertime haze, suggesting a comparable contributionof Nap and MN with monocyclic-aromatics on urban SOA formation.

Time-dependent effects on small intestinal transport by absorption-modifying excipients

The relevance of the rat single-pass intestinal perfusion model for investigating in vivo time-dependent effects of absorption-modifying excipients (AMEs) is not fully established. Therefore, the dynamic effect and recovery of the intestinal mucosa was evaluated based on the lumen-to-blood flux (Jabs) of six model compounds, and the blood-to-lumen clearance of 51Cr-EDTA (CLCr), during and after 15- and 60-min mucosal exposure of the AMEs, sodium dodecyl sulfate (SDS) and chitosan, in separate experiments. The contribution of enteric neurons on the effect of SDS and chitosan was also evaluated by luminal coadministration of the nicotinic receptor antagonist, mecamylamine. The increases in Jabs and CLCr (maximum and total) during the perfusion experiments were dependent on exposure time (15 and 60 min), and the concentration of SDS, but not chitosan. The increases in Jabs and CLCr following the 15-min intestinal exposure of both SDS and chitosan were greater than those reported from an in vivo rat intraintestinal bolus model. However, the effect in the bolus model could be predicted from the increase of Jabs at the end of the 15-min exposure period, where a six-fold increase in Jabs was required for a corresponding effect in the in vivo bolus model. This illustrates that a rapid and robust effect of the AME is crucial to increase the in vivo intestinal absorption rate before the yet unabsorbed drug in lumen has been transported distally in the intestine. Further, the recovery of the intestinal mucosa was complete following 15-min exposures of SDS and chitosan, but it only recovered 50% after the 60-min intestinal exposures. Our study also showed that the luminal exposure of AMEs affected the absorptive model drug transport more than the excretion of 51Cr-EDTA, as Jabs for the drugs was more sensitive than CLCr at detecting dynamic mucosal AME effects, such as response rate and recovery. Finally, there appears to be no nicotinergic neural contribution to the absorption-enhancing effect of SDS and chitosan, as luminal administration of 0.1 mM mecamylamine had no effect.

User knowledge utilization in innovation of complex products and systems: An absorptive capacity perspective

Firms tap into user knowledge to learn about the users’ needs. While users have been recognized as a valuable source of knowledge for innovation, few studies have investigated how their knowledge is integrated into innovation processes in the context of complex products and systems (CoPS). The purpose of this study is to reveal the practices of CoPS manufacturers to facilitate user knowledge utilization for innovation. We investigate two case companies, a medical device manufacturer and an aircraft manufacturer, and report on seven managerial practices for utilizing user knowledge. We adopt the absorptive capacity model in structuring our findings and elaborate three of the model's sub‐capabilities (recognition of the value of user knowledge, acquisition of user knowledge, and assimilation/transformation of user knowledge) by proposing that each is associated with a distinct managerial goal and related practices: (1) Sensitizing the organization to the innovation potential of user knowledge, (2) identifying and gaining access to suitable user knowledge, and (3) analyzing and interpreting user knowledge and integrating it into product development. Our study contributes to the innovation management literature by analyzing the capabilities required to utilize user knowledge throughout the CoPS innovation process.

Frozen lattice and absorptive model for high angle annular dark field scanning transmission electron microscopy: A comparison study in terms of integrated intensity and atomic column position measurement

In this paper, both the frozen lattice (FL) and the absorptive potential (AP) approximation models are compared in terms of the integrated intensity and the precision with which atomic columns can be located from an image acquired using high angle annular dark field (HAADF) scanning transmission electron microscopy (STEM). The comparison is made for atoms of Cu, Ag, and Au. The integrated intensity is computed for both an isolated atomic column and an atomic column inside an FCC structure. The precision has been computed using the so-called Cramér–Rao Lower Bound (CRLB), which provides a theoretical lower bound on the variance with which parameters can be estimated. It is shown that the AP model results into accurate measurements for the integrated intensity only for small detector ranges under relatively low angles and for small thicknesses. In terms of the attainable precision, both methods show similar results indicating picometer range precision under realistic experimental conditions.

Gatekeepers’ innovative use of IT: An absorptive capacity model at the unit level

This paper examines the potential role of gatekeepers’ innovative use of information technology (IT) in organizational units and its ability antecedents. Using absorptive capacity theory as our theoretical lens, we theorize a model of innovative use of IT at the unit level. The proposed model was empirically validated using a survey of 204 unit gatekeepers. This paper develops a preliminary model of innovative use of IT that can inform and guide future research, specifically focusing on the key role of gatekeepers and the abilities needed by users in this role that can help in using IT in an innovative manner.

Equilibrium absorptive partitioning theory between multiple aerosol particle modes

Abstract. An existing equilibrium absorptive partitioning model for calculating the equilibrium gas and particle concentrations of multiple semi-volatile organics within a bulk aerosol is extended to allow for multiple involatile aerosol modes of different sizes and chemical compositions. In the bulk aerosol problem, the partitioning coefficient determines the fraction of the total concentration of semi-volatile material that is in the condensed phase of the aerosol. This work modifies this definition for multiple polydisperse aerosol modes to account for multiple condensed concentrations, one for each semi-volatile on each involatile aerosol mode. The pivotal assumption in this work is that each aerosol mode contains an involatile constituent, thus overcoming the potential problem of smaller particles evaporating completely and then condensing on the larger particles to create a monodisperse aerosol at equilibrium. A parameterisation is proposed in which the coupled non-linear system of equations is approximated by a simpler set of equations obtained by setting the organic mole fraction in the partitioning coefficient to be the same across all modes. By perturbing the condensed masses about this approximate solution a correction term is derived that accounts for many of the removed complexities. This method offers a greatly increased efficiency in calculating the solution without significant loss in accuracy, thus making it suitable for inclusion in large-scale models.

Necessitated absorptive capacity and metaroutines in international technology transfer: A new model

International technology transfer of advanced technology and knowledge and their subsequent absorption is crucial to firms in developing nations. This research paper aims to further enhance the understanding and operationalization of the absorptive capacity construct. In the rigorous review of existing literature, organizational routines were found to play a significant role in enhancing an organization's absorptive capacity. We present our conceptualization of necessitated absorptive capacity as a dynamic organizational capability in the Necessitated Absorptive Capacity model. This paper contributes to the existing literature by providing a new model and an enhanced understanding and further operationalization of absorptive capacity.

Capacidade absortiva em agências de viagens: um estudo no Estado de Sergipe, Brasil

Este artigo tem como objetivo analisar a capacidade absortiva de agências de viagens, com base no modelo de capacidade absortiva de Zahra e George (2002). A pesquisa se justifica dada a representativa do segmento turístico no setor de serviços e a necessidade de utilizar medidas de inovação mais próximas das especificidades do setor e voltadas às capacidades dinâmicas dessas empresas. O estudo é quantitativo, com abordagem exploratória e descritiva. Foi utilizada uma survey, tendo um questionário como instrumento de coleta de dados. A pesquisa foi realizada junto às agências de viagens filiadas à ABAV Sergipe – Associação Brasileira das Agências de Viagens do Estado de Sergipe, totalizando inicialmente 50 empresas listadas, das quais 08 não puderam participar, de modo que foi obtido um total de 42 (84%) respondentes, incluindo as agências de viagens localizadas no interior do Estado. A tabulação e análise dos dados foram feitas com o auxílio dos softwares IBM SPSS Statistics 19, Minitab 17 e Microsoft Excel 2007. Os resultados demonstraram que a imitação criativa é uma das principais fontes de inovação para as agências do Estado de Sergipe e fruto do relacionamento com clientes e outras empresas, sejam concorrentes ou fornecedores, o que torna essas empresas abertas para novos conhecimentos. As agências pesquisadas também criam redes informais que garantem que o conhecimento e as informações de que necessitam sejam transmitidas dentro da organização de maneira rápida e dinâmica. Como contribuição, o artigo avança na literatura de inovação e turismo, ao estudar a inovação sob uma perspectiva diferente da shumpeteriana, propondo uma lente de análise alternativa.

Twisting the twist: how manufacturing & knowledge-intensive firms excel over manufacturing & operational and all service sectors in their eco-innovative orientation

Innovation, sustainability and knowledge are outstanding concepts nowadays for firms to gain competitive advantage. There is a need to cross-seed the variables that take part in the companies' decision-making process in order to identify how firms' characteristics influence their innovative activities. In this paper, we focus on the sustainable innovations (which we call eco-innovation) and compare knowledge-based versus non-knowledge-based (operational) firms' patterns, also considering manufacturing versus service sectors. To do so we rely, theoretically, on the well-known absorptive capacity model. The method used is the PLS multigroup analysis and the sample selected consists of a secondary dataset of +5900 data points from the 2012 Innovation Spanish Panel (PITEC). Results show that, on one hand, there is no difference in the way that firms acquire and assimilate knowledge and that knowledge-intensive firms excel to transform their ability to eco-innovate. On the other hand, manufacturing firms are one step further than service firms in their eco-innovative orientation.