Degree Of Permeability Research Articles

Numerical Simulation of the External Water Pressure in Seepage Anisotropy Under Heterogeneous Conditions

The external water pressure and seepage quantity are crucial factors in tunnel construction design, especially under complex geological conditions. Both analytical solutions and numerical simulations can be used to calculate the external water pressure in a shallow circular cross-section tunnel. Analytical formulas are usually derived based on homogeneous surrounding rock, which seems somehow unrealistic. In reality, the engineering geological conditions are complex and the surrounding rock is heterogeneous. Therefore, the results of analytical formulas may deviate from the actual results. This study takes the No. 1 shallow-buried tunnel in the north bank of the Xiaolangdi irrigation area as its research background. Based on heterogeneous and anisotropic analyses, the horizontal permeability, the vertical permeability, the parameters of the lining and grouting circle, and the position head are the main factors affecting the stability of the external water pressure. The result shows that the external water pressure increases as the ratio of the horizontal permeability coefficient to the vertical permeability coefficient increases. Moreover, when a grouting ring is used to block the water, the lining is guaranteed to have a certain degree of permeability, which helps to better achieve the purpose of reducing the external water pressure.

Montmorillonite combined with microbially induced carbonate precipitation for wind erosion control of bare surface soil in arid mining area

Open-pit mining will form a large area of bare soil. Under the dry and windy climate in northern China, the surface bare soil of mining area is prone to wind erosion and dust, posing a threat to the environment and human health. This study evaluated the performance of montmorillonite combined with microbially induced carbonate precipitation (MICP-M) to control bare soil wind erosion in mining area. Results showed that the average CaCO3 contents, surface strength, threshold friction velocity (TFV) and thickness of soil crust was the highest, and the mass loss was the lowest in MICP-M group, which significantly improved the wind erosion resistance. After MICP-M solidified the bare soil, the pH value only slightly increased. The consolidation layer could effectively lock in soil moisture, maintain a certain degree of permeability, and had good environmental application performance. Field emission scanning electron microscope (FESEM) tests with energy dispersive X-ray (EDX) and X-ray diffraction (XRD) confirmed more calcite appeared in the soil treated with MICP-M. Ultra-depth three-dimensional maps and particle size analysis indicated that biological bridging was the main consolidation mechanism. The above results indicate that MICP-M has great potential as a wind erosion mitigation strategy.

Remote sensing and geophysical methods for delineating groundwater resources in schists hard rocks of the Adamawa Yadé Domain, Cameroon

The combination of remote sensing and geophysical techniques is a practical approach for mapping environmental hydrogeological setting and delineating groundwater zones. This paper applies an integrated approach to identify and extract the subsurface structures that act as conduits for the groundwater flow in the highly deformed area of the Adamawa region. Remote sensing data through the lineament’s extraction technique highlights topographic lineaments along which rivers flow in the area. The distribution of these lineaments according to the lineament density map indicates the degree of permeability or porosity of each region and thus the capability in terms of groundwater potential. The filtering of aeromagnetic data enables to produce a structural map showing various geophysical lineaments interpreted as the fault systems of the study area. These faults are the main conduits through which magnetized rocks of granitoid type intruded into the basement and groundwater flows to the subsurface. Local application of the vertical electrical sounding (VES) shows that the study area is highly fractured/faulted and composed of multiple lithologic units including two aquifer layers (clayey sands and fractured schists) with thickness ranging from 5 to 15 m and from 34 to 82 m, respectively. Geoelectric cross-sections reveal that the subsurface structures consist of horsts, followed by a progressive subsidence depicted by the NE-trending faults towards the southern depression and grabens bounded by NW- and NE-trending normal faults. These prominent structures (faults, fractures, and grabens) are considered as the conduits for the groundwater flow into hard rock aquifers of the study area.

Temporal Scour Variations at Permeable and Angled Spur Dikes under Steady and Unsteady Flows

Spur dikes are river protection structures typically used for flow diversion from erodible banks. However, scouring might be a severe problem that compromises their stability and, consequently, their hydraulic function. This paper aims to study the maximum scour depth at permeable and angled spur dikes under hydrographs of different duration. Experiments were carried out in a rectangular channel 10 m long, 0.76 m wide, and 0.6 m deep. The mobile bed was made of nearly uniform sand with a median grain size of 0.8 mm. A total of 36 new experiments were performed with a detailed data collection over the time (i.e., 216 datasets), which could provide a useful contribution to the topic. The impact of the spur dike orientation angle, θ, and the degree of permeability, φ, on the temporal scour evolution were explored. Results were found physically consistent and revealed that the spur dike permeability implies a significant attenuation of the scouring processes in comparison to the impermeable spur dikes and generally its effect is more beneficial than that from a favorable orientation angle. The differences in percentage between the maximum scour depth for impermeable spur dikes and the maximum scour depths for various degrees of spur dike permeability were found ranging from 44% (at φ = 33% and θ = 60°) up to 88% (at φ = 66% and θ = 120°). Other results include the effect of the hydrograph base-time on the scour depth and the comparison between scouring processes under steady and unsteady flow conditions. By quadrupling the hydrograph base-time, keeping constant the peak and base flood discharges, the maximum scour depths increased by about 29%, 42%, and 25% in case of impermeable spur dike, spur dike with 33% degree of permeability, and spur dike with 66% degree of permeability. Furthermore, starting from dimensional analysis a new empirical model (with coefficient of determination R2 equal to 0.94) is introduced to predict the time-dependent scour depth due to the passage of a flood wave. The model suggests that the main independent dimensionless variables which control local scour processes are: the densimetric Froude number, the time t normalized to the hydrograph base-time, the degree of permeability, and the orientation angle. These dimensionless variables would generalize the laboratory results to the real-world scenarios, although caution should always be taken because of possible scale effects.

Urban form and economic sustainability in housing projects

Urban areas in metropolitan cities like Cairo suffer from economic, social, and environmental predicaments. Urban economic sustainability is an approach that reforms the urban performance to gain direct benefits such as minimizing costs and maximizing profits and indirect benefits as better social, environmental, and cultural aspects. This research suggests applying such an approach to enhance Egyptian housing projects. The main research question is how to evaluate the economic sustainability of urban forms?. The study presents a “Sustainable Urban Economy model” (SUE model) linking urban fabric, land use pattern, transportation, and street network design with economic sustainability. Research methods and tools include interviews (Delphi method) with 25 urban planning/design and urban economic experts to refine the model. Results show the most effective components of the urban form on economic sustainability (accessibility and degree of permeability, population density, built, and the impact of sub-indicators on the main components. Moreover, results indicate that the seven most influential indicators are the built-up to total space ratio, mixed-use ratio, built-up ratio, population density, floor area ratio, degree of accessibility, and public transportation. Experts suggested values for the seven indicators to measure how the urban form can achieve high economic, environmental, and social performance in the Egyptian context.

EPCT-09. CNS LEVELS OF PANOBINOSTAT IN A NON-HUMAN PRIMATE MODEL: COMPARISON OF BLOOD AND CEREBROSPINAL FLUID PHARMACOKINETIC METHODS AND MALDI MSI

Adequate exposure (effective concentration over time) of a therapeutic agent at its site of action is essential for antitumor efficacy. Given constraints of repeat tissue sampling, non-human primate models predictive of pharmacokinetics in pediatric patients have been utilized to assess central nervous system (CNS) exposure. Assessment of cerebrospinal fluid (CSF) drug levels have been used to extrapolate CNS penetration but the relationship of CSF drug levels with tissue distribution is unclear. Utilizing microdialysis, we previously demonstrated geographic variability of drug permeability across the blood:brain barrier (BBB), but this technique is complex and has a high standard deviation. We, therefore, explored a novel technique, matrix-assisted laser desorption/ionization mass spectrometry imaging (MALDI MSI), to compare plasma, CSF, and tissue drug levels in a terminal non-human primate model. Panobinostat, an HDAC inhibitor in clinical trials for DIPG/DMG, was selected for study as it has previously demonstrated poor CNS tissue penetration but suggested modest clinical activity.MethodsPanobinostat (p.o., dose 1.6 mg/kg) was administered to non-tumor bearing primates (n=2). One hour following administration (Tmax), blood and CSF were collected, the animal euthanized, brain and spinal cord extracted, and immediately frozen at -80. Panobinostat distribution was mapped on ex vivo sagittal tissue sections using MALDI MSI. To provide specificity and degree of permeability, anatomical structures were segmented for analysis to determine drug concentrations. Blood, CSF and tissue levels of panobinostat were measured via LC-MS/MS.ResultsSegmentation analysis revealed quantifiable panobinostat, particularly in the lateral ventricles and choroid plexus, and also in the subventricular zone and brainstem, although the overall panobinostat concentration was below the limit of quantitation in these areas.ConclusionsAlthough not reflected in CSF PK, panobinostat is widely distributed in brain tissue. MALDI MSI allows regional assessment of panobinostat penetration and complements CSF pharmacokinetics.

Assumptions about fence permeability influence density estimates for brown hyaenas across South Africa

Wildlife population density estimates provide information on the number of individuals in an area and influence conservation management decisions. Thus, accuracy is vital. A dominant feature in many landscapes globally is fencing, yet the implications of fence permeability on density estimation using spatial capture-recapture modelling are seldom considered. We used camera trap data from 15 fenced reserves across South Africa to examine the density of brown hyaenas (Parahyaena brunnea). We estimated density and modelled its relationship with a suite of covariates when fenced reserve boundaries were assumed to be permeable or impermeable to hyaena movements. The best performing models were those that included only the influence of study site on both hyaena density and detection probability, regardless of assumptions of fence permeability. When fences were considered impermeable, densities ranged from 2.55 to 15.06 animals per 100 km2, but when fences were considered permeable, density estimates were on average 9.52 times lower (from 0.17 to 1.59 animals per 100 km2). Fence permeability should therefore be an essential consideration when estimating density, especially since density results can considerably influence wildlife management decisions. In the absence of strong evidence to the contrary, future studies in fenced areas should assume some degree of permeability in order to avoid overestimating population density.

Hydraulic conductivity and calcium carbonate content of biocemented heavy-metal contaminated mine waste soil

It is not uncommon for mining activity to generate wastes associated with negative engineering impacts include susceptibility to runoff due to the absence of vegetation, erosion, and sinkhole. Due to their high degree of permeability, movement of heavy metal contaminants in waste soils and aquifers occurs actively along with the hydrogeological parameters, and research on using biocementation methods such as enzyme induced calcite precipitation (EICP) to reduce the hydraulic conductivity is therefore beneficial. Mine waste soil collected from a copper mine in Lohan Dam, Sabah is characterized physically, morphologically, and chemically then treated with EICP under different operational parameters include curing duration (1,3,7 days), curing temperatures (5, 10, and 25 oC ), and relative density (70 and 80 %). The hydraulic conductivity was then tested using a constant head permeability test and the calcium carbonate content (%) is determined using the HCL washing method. Properties of the Lohan Dam wastes are found to be predominantly coarse grain soil of low plasticity, high specific gravity, high permeability, acidic in nature, and low organic content. Morphologically, they are composed of powdered and hardened particles with dark brown color with high amount of irregular-shaped particles. Mineralogical, Lohan Dam soil wastes contain a high level of heavy metals beyond the safety level of the Department of Environmental Malaysia. EICP treatment had to change the degree of permeability from ‘high and medium’ to ‘low’ with a 94-97% reduction in hydraulic conductivity corresponding to the amount of calcium carbonate content produced ranging 6.94-9.63%. In conclusion, relative density shows the marginal effect, curing duration, and temperature shows a more significant impact on the treatment effectiveness.

Characteristics and Reflections on Moral Education in American Schools

America's moral education has its own characteristics and advantages. Firstly,containing a certain degree of permeability and concealment.Secondly, attaching great importance to the joint efforts made by families, schools and society. Thirdly, respecting the subject status of students to arouse their enthusiasm and initiative. Last but not least,building psychological counseling agencies to offer consulting services.

INFLUENCE OF FINE ADDITIVES AND SURFACTANTS ON THE STRENGTH AND PERMEABILITY DEGREE OF CONCRETE

The results of studies to determine the effect of titanium dioxide nanoparticles (nanoTiO2), finely dispersed anatase crystalline titanium dioxide (anatazTiO2) and surface-active substances (surfactants) on the compressive strength, degree of permeability and thermal stability of concrete samples are presented. Adding particles of nanotitanium, anatase titanium and surfactants up to 2 % to cement accelerates the hydration process and increases the strength of concrete, and also has a strong effect on its microstructure. As a result of the studies, it is experimentally proved that the compressive strength of concrete increases with the addition of titanium dioxide (nanoTiO2) nanoparticles by 23.2 %, finely dispersed anatase crystalline titanium dioxide (anatazTiO2) by 21.7 % to 5 % concentration by weight. In addition, the introduction of these additives reduces the permeability of concrete. This is due to a decrease in the absorption of concrete by water with the addition of nanotitanium and anatase titanium. The introduction of additives from 1 % to 5 % by weight in concrete reduces the depth of chloride penetration by 10–15 times, compared with the control. The use of temperature-programmed desorption mass spectrometry (TPD-MS) method has shown that an increase in the percentage of TiO2 nanoparticles to 5 % in concrete mixtures correlates with an increase in microporosity and dispersion level of these mixtures, which causes a shift in the peaks of intense gas evolution from the samples when heated to the side low temperatures (for example, carbon dioxide CO2). The resulting concrete samples are planned to be used for the manufacture of floors in livestock buildings. The injected additives are selected because they are not toxic substances and, in contact with the biological environment of livestock buildings (urine, feces), will not react with them

Hydrogeology of the western Po plain (Piedmont, NW Italy)

ABSTRACT This paper describes the hydrogeological map of the western Po Plain, located in Piedmont (north-western Italy). Po plain represents a hydrogeological system of European relevance, and the Piedmont Plain is the most important groundwater reservoir of the Region. The 1:300,000 scale map was realised using previous and new data to update the knowledge of this area. The map provides information about the hydrogeological complexes and their type and degree of permeability, water table levels and depth, piezometric level fluctuation, lithostratigraphic cross-sections, thickness, and percentage of the permeable deposits between 0 and 50 m from the ground surface. All this information is essential to public administrations, stakeholders, researchers, and professionals for defining possible tools for groundwater protection and management and for planning new groundwater exploitation (i.e. municipal drinking water supplies).

Urban streets and social interactions in ‘third places’: The urban regeneration of Al Wakrah Old Souq (State of Qatar)

The social-spatial complexity of a city can be explored through the relationship between its built forms and users’ daily social activities. Researchers argue that there is a relationship between the built environment, social interactions and activities within commercial streets: the presence of a variety of businesses encourages social interactions. As stressed by sociologist Ray Oldenburg,1 ‘third places’ can be regarded as areas of public interest, away from work or home, encouraging social interactions due to a diversity of commercial activity. In order to create a liveable city, therefore, it is necessary to understand the extent to which social interactions at the microscale level are generated by social activities on commercial streets. This research study explores these issues in the context of the urban regeneration of Al Wakrah Corniche Street, a commercial area located in a medium-sized Qatari town. The research design is based on: 1) a theoretical; and 2) an analytical/applied approach. The data obtained through behavioural mapping and visual on-site surveys allowed the determination of each location’s Liveliness Index (LI), which measures the characteristics of a setting in terms of social interaction and engagement. The findings reveal that: 1) the LI for ‘third places’ is higher when compared to other businesses; 2) ‘third places’ along the Corniche Stretch encourage social interactions; and finally 3) specific physical characteristics, such as the degree of permeability, degree of personalisation, seating provided by businesses, shade and shelter within commercial streets, contribute to the urban regeneration of the built environment and/or enhance social interactions in third places.

Impact of the Internet Using Experience on the Peculiarities of the Internet Texts Understanding

Objective. The article presents the results of the empirical study of the impact of the Internet using experience on the process of the Internet texts understanding.
 Materials & Methods. Different theoretical methods and techniques were used for this purpose: deductive and inductive methods, analysis and synthesis, generalization, systematization. Empirical methods were used for this purpose: experiment (semantic and receptive), method of semantic and pragmatic interpretations, content analysis, subjective scaling procedure. Mathematical methods were used: primary statistics, checks on the normal nature of the data distribution, statistical output, taking into account statistical indicators of fashion and the scope of variation. As well as some interpretive methods that are based on specific principles of systemic, activity, cognitive and organizational approaches.
 Results. The author notes that Internet texts understanding is significantly different from the understanding of oral or written texts, since the Internet text is a pragmatically integral electronic document that constructing of conditionally completed text blocks in the form of «windows», that are opened in separate tabs of the browser, the order that depends on hyperlinks and user behavior. The peculiarities of the Internet texts include enhanced dialogue, divisibility, external informativity, reduced connectivity and comprehension, pragmatic and mostly formal integrity, conditional completeness, complicated structural, as well as hybrid and high degree of permeability, multimedia, presentation, inclination to speech game and collective authorship, saturation with neologisms, emoticons and abbreviations, fragmentation, non-compliance with linguistic norms, and the functioning of a special language etiquette.
 Conclusions. As a result of empirical research involving 716 respondents from different regions of Ukraine, it was determined that experience has the most significant effect on the understanding process at the reception stage, guiding users' activity and the accuracy of their expectations. Experience contributes to the accuracy of predicting the content of Internet texts by 15,0%. At the stage of interpretation, the adequacy and completeness of Internet texts interpretation with the accumulation of experience is improved by almost 10,0%. However, even experienced users were able to correctly interpret only a quarter of the dominant, while random – only a sixth part. Even less important is the experience and Internet activity at the stage of emotional identification, nor the assessment of comprehension, nor the coherence of emotional attitude is almost independent of the Internet using experience. With the accumulation of experience, users evaluate Internet texts more homogeneously, they are easier to realize their own attitude to the Internet texts, it becomes more consistent, however, they underestimate the complexity of Internet texts more than half of the cases, they are also inclined to share texts on the approval and critical like inexperienced readers.

Changing Protein Permeability with Nephron Loss: Evidence for a Human Remnant Nephron Effect

Background: If loss of functioning nephrons predisposes to glomerular barotrauma (a “remnant nephron” effect), then glomerular permeability should increase as glomerular filtration rate (GFR) falls, as is observed in animal models of nephron loss. Methods: Changes in net renal protein permeability, defined as proteinuria or albuminuria per mL/min of GFR, were measured in the setting of nephron loss due to kidney donation (Assessing Long Term Outcomes in Living Kidney Donors cohort) or progressive chronic kidney disease (CKD; Modification of Diet in Renal Disease [MDRD], African American Study of Kidney Disease [AASK], and Chronic Renal insufficiency Cohort [CRIC] studies). Results: Following kidney donation, renal albumin permeability increased by 31% from predonation levels (p < 0.001). With progression of CKD, a 50% loss of residual GFR was accompanied by increases in proteinuria per mL/min GFR of 1.8-, 2.1-, and 1.6-fold in the MDRD, AASK, and CRIC cohorts, respectively (p < 0.001 for all), independent of changes in systolic blood pressure and ACEi/ARB use. A 70% reduction in GFR was associated with permeability increases of 3.1-, 4.4-, and 2.6-fold in the same cohorts. Among MDRD participants with progression of nonglomerular primary disease, the 75th percentile of final permeability was 141 mg/24 h proteinuria per mL/min GFR. This degree of permeability would have resulted in nephrotic range proteinuria had it been present at the baseline mean GFR of 40 mL/min, implying the development of de novo glomerular pathology as GFR fell. Increasing permeability also accompanied CKD progression in participants with nephrotic syndrome at baseline. Consequently, these participants had little improvement in 24 h proteinuria or serum albumin, despite substantial loss of functioning nephron mass across which the protein leak occurred. In the absence of a fall in GFR, there was no increase in permeability in any cohort. Conclusion: Nephron loss is accompanied by an increase in renal protein permeability, even in the absence of a primary glomerular disease. This is consistent with a remnant nephron effect in human CKD.

In or Out? Exploring the Inconsistency and Permeability of Team Boundaries

Despite the fundamental relevance of team boundaries for team research, scholars have rarely explored their origins and characteristics. Instead, team research commonly assumes the existence of formally defined, stable team boundaries. We challenge this assumption by asserting that beyond formal assignment, team members’ individual perceptions of a team’s boundaries are driven by individual-level categorization processes and team-level task dynamism. Building on multiple team members’ mental representations of team boundaries, we propose that team boundaries are likely mutually inconsistent and vary in their degree of permeability. This permeability and inconsistency serve to clarify how membership change and overlap can induce cognitive and emotional spillovers across teams. The proposed conceptual model links the origins of boundary emergence with their characteristics by explaining how membership structure and dynamics drive the characteristics of team boundaries. This account offers a new perspective on how individual perceptions of work affiliations can shape a team’s boundaries.

Evaluating the impact of mass housings' in-between spaces' spatial configuration on users' social interaction

This research examines the impact of in-between space configuration on users' social practices. The effects of different degrees of permeability of these spaces on the social interactions of the inhabitants are also analyzed. This research is based on a comparative approach using space syntax analysis and snapshot observations on four mass housing neighborhoods in Setif, Algeria. The neighborhoods are selected according to their degree of permeability, location in the city, realization period, and syntax measures from integrated to segregated. The activity patterns of two-week days for each study case are observed and recorded. Correlation results of observed social activities and syntactic measures demonstrate that spatial configuration affects people's use of in-between spaces. Moreover, connectivity and clustering coefficients are revealed to be important indicators of social activities. Previous urban studies argued that integrated spaces are mostly used by people. However, social interaction in the studied cases increases in the least connected areas, adjoining spaces to the buildings, and most closed spaces. This research finds that social activities are dependent on the degree of permeability, which when low, gives rise to increased social interaction and activities.

Characterization of two-phase flow in porous media using global mobility

Abstract Proper characterization of multi-phase flow in porous media is of significant importance in selecting and optimizing the performance of a given oil reservoir. The main factors influencing the characterization of multi-phase flow in porous media include: microscopic pore structure, movable fluid saturation, nonlinear seepage characteristics and clay minerals composition, and etc. However, it is very difficult to quantitatively study the multi-phase flow process in porous media, because there is no clear relationship between the oil production rate and the physical parameters of oil reservoir, particularly in low permeability reservoirs. Furthermore, on-going research activities has led to the discovery that it has been a challenge to tell why two oil reservoirs with the same degree of permeability (i.e. low permeability) have far different production performances. In an attempt to comprehend this challenge, a concept of global mobility by Li and Horne (2005, 2006) derived from the Li-Horne model was proved to be a new approach for evaluating the seepage capacity in imbibition system, because it can unify oil and water phase mobility into one model and take many static and dynamic physical parameters into accounts. In this paper, the global mobility concept is applied and verified to characterize the mobility of a multi-phase flow and evaluate the production performance from core to field scale. Comparisons between the global mobility concept and other characterization methods were conducted based on various flooding experiments and field data tests from rock/oil/water systems and rock/oil/polymer systems with different porosities and permeabilities. The results showed that there is a linear relationship between the global mobility and the production performance which is better than the other methods, and the application range of the global mobility was extended. In addition, a convenient and empirical approach was proposed to obtain the global mobility with relative permeability data. Its feasibility has been preliminarily proved through five case studies, and the demonstration is that the global mobility could be an effective parameter to characterize a two-phase flow in porous media and evaluate the production performance for field application.

The Efficiency and Degree of Penetrability of Frequent Washing Solutions Used in Endodontal Treatment

The new directions of contemporary endodontics to the evolution of treatment techniques are: CTCB, digital radiography, operating microscope, apex locators, titanium nickel rotation tools and rotating systems that allow them to be used, special endodontic irrigation means, use of ultrasonic means, laser applications. The success rate of nowadays endodontic treatments based on the principles accepted and adopted so far should be rather high. However, there are studies that indicate a fairly low percentage of fully successful endodontic treatments. The main causes for which these data are recorded are various, some are strictly the dentist�s technique and some are related to the patient�s field. Obviously, there is a contradiction between what can be achieved and the final result. The study includes a batch of 52 teeth pluriradicular as well as monoradiculars considered irrecoverable and extracted due to clinical situations requiring this method of treatment. Anatomy of dental canals is an important factor to be considered in the irrigation efficiency of the apical region; the degree of permeability of dentinal canals in this area is poor due to very small diameters, cumulative factors can lead for sure to a failure of endodontic treatment. In the coronal and media regions of the channels, the effectiveness of the lavage solutions used could be assessed. These very good results were in accordance with the studies performed and presented.

The Performance of Earth Retention Pond Water Retain Capability Using Geotechnical Properties Evaluation

Development of a new modern housing areas has demand a retention pond for recreation activity and landscaping purposes. This study deals with the evaluation of water retain ability of a new retention pond from the soil condition perspective. Geotechnical laboratory testing was performed via particle size distribution, Atterberg limits and permeability to assess the retention pond soil condition. All the experiment was performed according to British Standard 1377 (1990). It was found that soil tested has been dominated by fine particles which ranged at 30.84 – 60.88 % compared to the coarse particles (sand and gravel). Atterberg limits results has found that all soil tested has a liquid limit (LL), plastic limit (PL) and plasticity index (PI) that was varied at 29 – 74 %, 16.9 – 33.6 % and 17 – 40.4 % respectively representing its promising water retain capability. Moreover, permeability result founds that all values of permeability coefficient, k was ranged at 3.11 x 10-4 – 5.65 x 10-7 cm/s thus conclude that all soil tested has low to very low degree of permeability. Finally, retention pond of a new development area has been evaluated directly according to its soil condition thus provide some valuable information to the responsible parties regarding the future planning and decision making of the sustainable catchment areas.

INDIVIDUAL AND ORGANIZATIONAL IDENTITIES IN MERGER CONTEXTS: A BOUNDARY PERSPECTIVE

ABSTRACT Purpose: To understand the boundary dynamics between organizational and individual identities that are negotiated in mergers. Originality/value: This was the first study to explore the interface of the boundaries between individual and organizational identities in merger contexts. Design/methodology/approach: The results are presented as a grounded theory based on interviews with 64 individuals from 16 different companies that have undergone mergers. Findings: We analyzed conflict, intrusion, distance and balance as consequences of internal and external identity boundaries’ (in) congruence between organizations and discussed how companies can minimize individual and organizational (of the merged company) identity conflicts through boundary work. Furthermore, we discussed the relationships between organizational and individual identity boundaries. The grounded theory we developed held that the degree of permeability between the internal and external boundaries between the organizations involved in a merger determines the types of episodic events and permanent states of conflict between organizational identities. In general, our study contributes to a holistic and comprehensive vision of how the boundaries between identities at the organizational and individual levels contribute to identity formation and the retention of individuals in the new merged organization. Suggestions for practice and for future researches are provided.