bluuebunny/crossref_metadata_2025 huggingface dataset:
Increasing Coal Seam Gas Field Productivity with Horizontal Well Technology: A Case Study
Authors: Lin Xuejun , Sutherland Graham , Cumming Duncan , Thomas Brian , Sani Ali
Published: October 2018

A Coal Seam Gas Field, operated by Origin Energy as upstream operator of the APLNG project in Queensland, Australia has been on commercial production since 2005. From inception to 2012 the development concept used vertical cavitated wells or vertical fracture stimulated wells. Four pilot surface to in-seam well pairs were successfully drilled and commissioned in 2012 and 2013. Based on the performance of these pilots, further development of the coal seam gas field converted from stimulated vertical wells to horizontal wells from 2015 onwards. Surface-in-seam (SIS), high-angle-sump-horizontals (HASH), and multi-laterals wells drilled with coil tubing technologies were implemented in the field. The paper describes horizontal wells drilling, completion and geo-steering technology. The optimal operational strategies of horizontal wells are also described and the production performance of horizontal wells are compared to the vertical well performance. The key factors contributing to the success of horizontal drilling in the field are presented.
Evaluation of Frac Hit Risks in Aishwarya Barmer-Hill Field Development Utilising GIS Platform
Authors: Pathak Shashank , Tibbles Raymond , Bohra Avinash , Tiwari Shobhit , Godiyal Preeti , Deo Aniket
Published: October 2018

Frac Hit is an inter-well communication event where an offset well is affected by the pumping of a hydraulic fracturing treatment in a new well. Close well spacing, increased fracture density (number of fracs per well), and larger fracture treatments increase the chance of a Frac Hit. This paper demonstrates how a Geographic Information System (GIS) was used in the Barmer Hill oil reservoir to quantify the risks of a Frac Hit on a well by well basis.

The Aishwarya Barmer Hill (ABH) field (<1 mD/cp) overlies the prolific Aishwarya Fatehgarh (AF) field (>3 Darcy's). The AF field was developed first with 71 wells. All of these wells for AF reservoir penetrated through shallower ABH reservoir at an average spacing of ∼100 m. The ABH field development plan calls for 1000 m long horizontal laterals with a ∼180 m distance between the wells to efficiently drain the entire ABH structure. The hydraulic fractures planned in ABH wells had an average fracture half-length of ∼100 m with 10 stages per well. With the spacing equal to the fracture half length, the likelihood of a Frac Hit between ABH horizontal wells was high. The presence of the nearby AF wells only added to the risk.

GIS enabled software was used to evaluate the risk magnitude and the observations were used to prepare a mitigation plan. All the well trajectories for both reservoirs were mapped inside the 3D reservoir structure. As a first case, a potential strike zone (PSZ) with a radius equal to the frac half-length was generated around the planned ABH wells. Wells were considered at risk if a PSZ intersected another well or another PSZ. Then all of the planned hydraulic fractures were mapped in 3 dimensions using the known fracture propagation azimuth (from appraisal well micro-seismic data) and the simulated fracture dimensions (Half-lengths & heights) using fully 3D frac modeling software.

The procedure clearly identified the cases (well/stage) which had a high potential for a Frac Hit. After identifying the high-risk cases, appropriate steps were taken to minimize the risk. The available options were to change the well trajectory, modify the fracture location (shift or remove stages), or propose additional surveillance.

The Frac Hit phenomena is a sub-surface integrity related concern which has been reported on in many technical papers. This work proposes a method for quantifying and minimizing the risks using a GIS platform. A method for categorizing the various risk cases based on well spacing, perforation and fracture initiation points is proposed. This method was studied for the ABH wells during the well planning phase and shall be applied in order to minimize Frac Hit risks. The information provided could also be directly utilized for in-fill development project for tight fields.
The First Application of Seismic While Drilling Technology in HTHP Offshore Exploration Well of South China Sea
Authors: Guo Shusheng , Gao Yongde , Chen Ming , Liu Peng , Chen Yanyan , Zhang Lei , Huang Zheyuan
Published: October 2018

D block in the South China Sea is challenging to drill due to both high temperature and high pressure (HTHP) concerns. Well D2 is a wild-cat exploration well in this HTHP area. The target formation is HTHP and the safe mud window is narrow. To drill safely, it is required to predict target zone depth accurately and monitor pore pressure ahead of bit while drilling.

Seismic-While-Drilling (SWD) technology was evaluated and applied for the first time in the D2 well of the South China Sea. In this well, with the checkshot data and seisimic waveforms from SWD, an integrated solution was provided, including updates of the time-depth relationship, depth prediction for the high-pressure problem formations, pore pressure monitoring and updated prediction ahead of the bit. All results were updated in real-time while drilling, helping to optimize the mud weight in a tight mud window scenario and to determine the final target depth of the open hole section and the casing depth.

The real-time and memory waveforms were processed and the resultant corridor stack was compared with surface seismic section for marker correlation. The predicted depth of the high pressure zone estimated from the SWD udpates was within 3 meters of the actual depth from drilling data.

Pore pressure and fracture gradient were also estimated in real-time with SWD data and the results were found to be consistent with the pore pressure measurement from wireline formation tester, obtained post drilling. By using the real-time target zone depth prediction and abnormal high pore pressure predictions based on SWD data, the D2 well was successfully completed without severe drilling issues. The casing was set to the proper depth which formed a solid foundation for the safe drilling of the next openhole section.

This case study is the first application of SWD in the sediments of the South China sea, especially within an HTHP environment. The results clearly show the effecacy of SWD in this specific geological environment.
Improving Polymer Flooding by Addition of Surface Modified Nanoparticles
Authors: Corredor Laura , Maini Brij , Husein Maen
Published: October 2018

The objective of this study was to examine the feasibility of improving the performance of EOR polymers by adding surface modified silica nanoparticles (NP). The nano-polymer sols were prepared by mixing different types of surface modified silica NP and hydrolyzed polyacrylamide (HPAM) or xanthan gum (XG) solutions. It is well known that the compatibility between organic polymer-inorganic oxide filler increases when the surface of the inorganic filler is chemically modified. To generate different interfacial interactions, the silica NP were treated by chemical grafting with carboxylic acids and silanes. The properties of the modified silica NP were characterized using Fourier transform infrared spectroscopy (FTIR) and the properties of the nano-polymer sols were investigated with viscometry and ζ-potential measurements. The non-Newtonian behavior of the nano-polymer sols was represented by Oswald-de Waele model.

Areal sweep efficiency of viscous oil displacements by nano-polymer sols was measured at 25°C in a Hele-Shaw cell representing one-quarter of a five-spot pattern. The fingering patterns of all XG samples were characterized by the formation of branched structures (at earlier growth stage) which by merging and coalescing formed stable interfaces. It was the expected behavior considering the high shear-thinning strength of the XG polymer and nano-polymer sols (n values between 0.17 and 0.27). However, the HPAM solutions and nano-polymer sols exhibited different fingering patterns with tip-splitting or suppressed tip-splitting and side-branching. This difference was attributed to different interactions between the modified NP and the polymeric chains of the two polymers.

The areal sweep efficiency of the HPAM polymer solutions did not improve by the addition of any type of NP because of the reduction of the viscosity of the polymer solution and the reduction of the interfacial tension between the injection fluid and oil. However, the XG polymer solutions, modified with the addition of 1.0 and 2.0 wt.% NP provided considerably improved sweep efficiency. The results are promising and show good potential for improving the performance of polymer flooding with Xanthan gum by addition of silica NP.
Laminaria – Corallina: Application of an Advanced Methodology for Accurate Metering Provides New Reservoir Insights and Better Facility Planning
Authors: Lange Nick , Gilbert Dave , Soh Martin , Teng Daniel
Published: October 2018

This paper presents an advanced method to accurately calculate oil and gas production from the Laminaria and Corallina fields produced by the Northern Endeavour FPSO on the Timor Sea, where direct metering has become unreliable or unavailable. The entire production data history was reconstructed, and results applied for better understanding of the reservoir and enabling better facility planning.

The newly developed allocation methodology is based upon PVT correlations that map liquid/gas ratios from production separator conditions to plant products. Mass balance at component level was applied to ensure sources and uses of gas + LPG were fully accounted for. Instead of the conventional approach where a simple oil shrinkage is applied, this method accounts for oil shrinkage which varies with process operating parameters, gas lift rate and back produced gas. The light oils from the Laminaria and Corallina fields are particularly susceptible to these effects.

Before any reconciliation, the total oil from these two fields calculated by this independent method compares closely with cumulative field life exported oil, and monthly reconciled rundown. Oil allocations between fields were rebalanced based on the mass allocation approach. Additionally, gas production figures were affected after discovering that a significant quantity of previously injected gas + LPGs had not been back-produced and was instead captured in the reservoir flow path. The reallocated production data and improved metering of current gas and LPG production rates enables a more representative reservoir model of remaining oil, gas and LPG ultimate recovery, well free-flowing limits, timing for infill wells and evaluation of the potential for alternate fuel availability based on mass reallocation of LPGs.

Insights from this work have provided key inputs into decisions on facility modifications and upgrade projects to maintain production and extend field life. The correlations and the workflow from this work have also been programmed into the Process Historian Database for better real-time monitoring and automation. The methodology described is applicable to other light oil or gas condensate fields to significantly improve metering, leading to better reservoir understanding and facility planning.
Primera época - Año II, Número 6, septiembre-diciembre del 2000
Authors: De San Luis Revista de El Colegio
Published: October 2018

Este número corresponde a la primera época de la Revista de El Colegio de San Luis, denominado VETAS.
Evaluation of the Efficiency of Smart Stability-Indicating Spectrophotometric Methods Based on Mathematical and Statistical Processing of the Obtained Results Via Different Manipulating Pathways
Authors: Lotfy Hayam Mahmoud , Fayez Yasmin Mohamed , Michael Adel Magdy , Nessim Christine Kamal
Published: October 2018

Background:

Smart different stability-indicating spectrophotometric methods have been
established for the assay of chlordiazepoxide and clidinium bromide without the intervention of alkaline
degradate of clidinium via various and different manipulating pathways without previous separation
steps.

Objective:

The specificity of the established methods was inspected by analysing mixtures of cited
drugs in the existence of the alkali-induced degradation product.

Methods:

These methods were employed either on scanned zero-order absorption spectra using absorbance
subtraction, dual wavelength and Q-absorbance ratio or the amplitudes of the ratio spectra of
zero-order absorption spectra like amplitude modulation and by derivative techniques to the ratio spectra
as a derivative ratio method. In addition, the absorbance of the recovered zero-order absorption spectra
was applied by successive ratio subtraction coupled with constant multiplication. Finally, the pathway
depends on the amplitudes of the derivative spectra, successive derivative subtraction coupled with
constant multiplication. The ranges of linearity were (1-12µg/mL) for chlordiazepoxide and (3-
12µg/mL) for clidinium bromide.

Results:

The outcomes achieved by the prospective methods were in consent with those of the official
and reported methods when statistically compared using student’s t test, F-test and one-way ANOVA
where no significant difference was detected with suitable precision, proving the absence of any important
difference in accuracy and precision between them. They were confirmed in accordance with International
Conference on Harmonization guidelines.

Conclusion:

The established methods can be considered as alternative methods for the routine determination
of this fixed dose combination with minimum sample preparation.
A Novel Potentiometric PVC-membrane Cysteamine-Selective Electrode Based on Cysteamine-Phosphomolybdate Ion-Pair
Authors: Tumur Merve , Kanberoglu Gulsah Saydan , Coldur Fatih
Published: October 2018

Background:

Cysteamine is used as an orphan drug in the treatment of cystinosis to prevent
long-term cystine accumulation in lysosomes. Dosing in cysteamine treatment is extremely important
and overdose may cause some side effects. Up to now, various analytical methods have been used for
cysteamine determination. Many of these methods require sophisticated instruments, expert operators,
time-consuming measurement procedures and manipulation steps, expensive supplies and long analysis
time.

Aims and Objective:

The present study deals with the development of a potentiometric PVC-membrane
cysteamine-selective electrode based on an ion-pair of cysteamine and its application in a
pharmaceutical formulation.

Methods:

Cysteamine (Cys)-Phosphomolybdate (PM) ion-pair was synthesized by mixing the equal
volumes of 10-2 M Cysteamine HCl and sodium phosphomolybdate aqueous solutions. The obtained
precipitate was used as ionophore in the structure of PVC-membrane.

Results and Discussion:

The electrode exhibited a linear response in the concentration range of 1.0×10-
1-1.0×10-5 M cysteamine with a slope of 51,7 mV per decade and detection limit of 1.0×10-5 M. The
potentiometric response of the electrode was very rapid (5 s), adequately repeatable, stable and selective.
pH working range and life-time of the electrode were also determined as 3.0-7.0 and 25 days, respectively.

Conclusion:

A PVC-membrane cysteamine selective electrode was easily prepared. Cysteamine determination
in a pharmaceutical formulation was performed. Analysis results indicated that it can be successfully
used in drug quality control laboratories for routine analysis of cysteamine in pharmaceutical
preparations alternative to more sophisticated, expensive and time-consuming analytical methods.
Determination of Hydrochlorothiazide and Two Major Degradation Products by Stability Indicating High Performance Liquid Chromatography
Authors: Bernardi Larissa Sakis , Júnior Pedro Nicolau Severino , Barreto Biscaia Isabela Fanelli , da Silva Sangoi Maximiliano , Todeschini Vitor , Mendes Cassiana , Silva Marcos Antônio Segatto , Oliveira Paulo Renato
Published: October 2018

Background:

Hydrochlorothiazide (HCTZ) is a thiazide diuretic which comprises two sulfonamide
groups. The literature is not clear regarding the identification of the chromatographic peaks of
its two major related substances: chlorothiazide and 4-amino-6-chloro-1,3-benzenedisulfonamide
(DSA).

Methods:

In the present study, a simple, sensitive, and selective HPLC method was developed and validated
for the assay of HCTZ, Chlorothiazide and DSA. The method was carried out on a C18 column,
maintained at 40ºC. The mobile phase was composed of monobasic potassium phosphate buffer 0.02M
pH 3.0/acetonitrile/methanol (82:9:9, v/v/v), run at a flow rate of 1.0 mL/min, and UV detection at
270 nm.

Results:

All related compounds including processing impurities and degradants from stressed samples
were well separated from each other. The performance of this method was validated in accordance to
the ICH guidelines and included specificity, linearity, limit of detection, limit of quantification, accuracy,
precision and robustness.

Conclusion:

Based on the results, the HCTZ degradation pathway was proposed and the validated
HPLC method was successfully applied to the quantitative analysis of HCTZ in pharmaceutical formulations,
contributing to improve quality control, to assure therapeutic efficacy and to clarify the literature.
Modifications of Midfacial Soft-Tissue Thickness Among Different Skeletal Classes in Italian Children
Authors: Gibelli Daniele , Zago Matteo , Cappella Annalisa , Dolci Claudia , Sforza Chiarella
Published: October 2018

Background:

The anatomical assessment of the arrangement of facial soft tissues has important applications in different fields from orthodontics to plastic surgery. One of the issues concerns the relationship between facial soft tissue thickness and skeletal class. Literature mainly deals with adult populations, whereas very few studies have been focused on children.

Objective:

This study aims at investigating the relationship between midline facial soft tissue thickness and skeletal classes in Italian pre-treatment orthodontic child patients.

Methods:

Lateral cephalometric X-ray films were obtained from 220 healthy Caucasoid children (91 males and 129 females), aged between 6 and 18 years (Class I: 41 males and 70 females; Class II: 18 males and 25 females; Class III: 32 males and 34 females). All the films were digitized and 14 soft tissue thicknesses were measured on the midface; in addition, the skeletal class was assessed according to the corrected ANB angle (ANBc). Differences in facial soft tissue thickness according to sex and skeletal class were assessed through two-way ANOVA test (p<0.01).

Results:

Statistically significant differences according to sex were found for labrale superius, stomion and labrale inferius, with thicker soft tissues in males than in females (p<0.01). Only measurements at labrale superius and gnathion showed statistically significant differences according to skeletal class, with thicker soft tissues in Class III children and thinner ones in Class II children (p<0.01).

Conclusion:

The limited number of investigations, as well as the differences in protocols, renders the comparison of results from different studies difficult, suggesting further investigations to enlighten this complex and debated anatomical issue.
Reexamination of Treatment of Seborrheic Keratosis Given Availability of New Prescription Therapy With Hydrogen Peroxide
Authors: Gaishauser Korina , Burkhart Craig G.
Published: October 2018

Seborrheic Keratoses (SKs) are one of the most common dermatologic lesions seen by dermatologists. They are biologically benign and do not usually require removal for medical reasons; however, many patients choose removal due to cosmetic preferences. Currently, cryotherapy (liquid nitrogen spray) is the most common mode of removal [1]. Although patients often desire an effective topical treatment, few have been developed that rival the effects of cryotherapy. This article aims to review current available topical treatments, with a particular focus on both the benefits and potential pitfalls of a novel treatment, concentrated Hydrogen Peroxide (H2O2).
‘Good comedy’ and the limits of humour
Authors: Popovic Helena
Published: October 2018

The article includes an overview of theoretical approaches to comedy and its
social function and outlines the results of an empirical research on
television audience reception of it. Even though the tolerance for specific
faux pas in comedy and humour is stretched due to its communicative
amusement value, they often transgress this line and initiate debates on the
limits of humour. This is why this area is useful when researching and
detecting norms and values in a specific socio-historical context. More
specifically, the article outlines the result of an empirical research on
audience reception of Da Ali G Show, a television comedy, that provocatively
triggers debate on the limits of humour in contemporary society.
Semi-structured interviews were carried out in two different settings:
London/ United Kingdom and Zagreb/Croatia in order to assess the way the
audiences discursively construct ?good comedy? and the limits of humour. The
article serves as a contribution to the understanding of the complex nature
of comedy and its reception in different socio-cultural settings.
Critical analysis of political system in Yugoslav socialism: Jovan Miric’s theoretical contribution
Authors: Jovic Dejan
Published: October 2018

In this article we analyse theoretical contribution to critical analysis of
political system of socialist Yugoslavia by (1934-2015), professor of
Political Science at University of Zagreb. The article focesses on his
writings during the socialist period (before 1989). Of 10 books he published
during his life, five are relevant for the topic of this paper: Interest
Groups and Political Power (1973), Work and Politics (1978), Pluralism of
Interests and Self-Managing Democracy (1982), System and Crisis (1984) and
Challenges of Democracy (1990). We also refer to the book of his interviews
and articles, which was published after his death. In is writings Miric gave
interesting and relevant contribution to Marxist Political Science, both in
terms of his theoretical work and in his analysis of Yugoslav Political
System. In later period, from 1989 onwards, he evolves towards Liberalism,
but remains highly critical towards the objects of his analysis. Critical
thinking remained a continuity in his writings and public appearences, in
both his Marxist and Liberal phases. His articles on the origins of the
crisis of Yugoslav Political System were in fact warnings that Yugoslavia
could collapse, largely due to its own internal structure and the lack of
trust between various segments of its political elites. In this sense,
Miric?s work justifies the question of predictability of events that soon led
to collapse of socialism and of Yugoslavia as state. Miric already in 1987
mentions civil war as one of possible outcomes of the Yugoslav crisis. His
work challenges conclusion that 1989 in Europe and 1991 in former Yugoslavia
were completely unpredictable, and that these moments were (two) Black
Fridays in social and political sciences.
PENDIDIKAN ISLAM DI ERA GLOBALISASI: Antara Konsepsi dan Aplikasi
Authors: Basyar Syaripudin
Published: October 2018

Penelitian ini akan memaparkan “Pendidikan Islam di Era Globalisasi: Antara Konsepsi dan Aplikasi” yang diawali permasalahan fital mengapa pendidikan Islam di Era Globalisasi niscaya dikaji secara konsepsi dan aplikasi?  dengan tujuan penelitian mengekspolasi keniscayaan pendidikan Islam di Era Globalisasi dikaji secara Konsepsi dan Aplikasi. Sedangkan penelitian ini dapat memberikan kontribusi teoritis dan kontribusi praktis. Dimana kontribusi teoritis dapat dijadikan paradigma baru bagi peneliti berikutnya untuk melakukanstudi tentangpendidikan Islam di Era Globalisasi: Antara Konsepsi dan Aplikasi. Sementara kontribusi praktis, bahwa pendidikan Islam  sangat relevan dan representatif untuk direalisasikan secara konsepsi dan aplikasi di era globalisasi saat ini, dimana disiplin ilmu ini selalu muttakhir, aktual, berkembang serta update pada setiap era dan generasi.Selanjutnya, penelitian ini merupakan studi kepustakaan (library research) dengan cara menela’ah berbagai literatur terkait dengan “Pendidikan Islam di Era Globalisasi: Antara Konsepsi dan Aplikasi”, secara prioritas literatur yang ditulis oleh para pakar pendidikan Islam klasik dan kontemporer. Sedangkan metode yang akan digunakan dalam penelitian ini adalah deskriptifdananalisis. Sementara prosedur pengolahan data, digunakan Content Analysis. Mencermati paparan di atas, maka temuan penelitian yang diharapkan adalah “Desain Pendidikan Islam di Era Globalisasi”, dimulai dari desain tujuan pendidikan Islam, desain kurikulum pendidikan Islam,  dan desain lembaga pendidikan Islam.
ENTREPRENEURSHIP EDUCATION OF COMMUNITIY EMPOWERMENT IN BUKIT BARISAN SELATAN NATIONAL PARK: A Case Study in Kubu Perahu Village West Lampung
Authors: Roni May
Published: October 2018

This study aims to find out the process and result of entrepreneurship education of community empowerment in Kubu Perahu Village. This is a kind of descriptive-qualitative research focusing on the processes described in four dimensions,namely: Access to Information, Inclusion & Participation, Accountability and LocalOrganization Capacity and the results divided into two indicators, namely: IndirectIndicator of Empowerment and Direct Indicator of Empowerment. The result of theresearch shows that the process of educational empowerment inCommunity entrepreneurship carried out by the BBSNP Center and the KubuPerahu Village community has still not yet optimal. In addition the resultsof educational empowerment of entrepreneurship in the community in Kubu PerahuVillage that have not achieved success. Community empowerment and communitywelfare are still not felt as a whole. The need for improvement of cooperationbetween the Balai Besar TNBBS and the Kubu Perahu Village Community inrelation to education empowerment community entrepreneurship is mainlyrequired. The community must also think critically, creatively and innovatively inutilizing the potencies and opportunities relatedto community entrepreneurship empowerment.
IMPLEMENTATION OF SCHOOL-BASED MANAGEMENT
Authors: Lazwardi Dedi
Published: October 2018

Education has an important role in influencing the advancement of a nation'scivilization. A nation that has good education tends to be an advanced nation in civilization, science and technology, social economy, as well asculture. One of the educational problems is the need for adjustment and improvement of educational program material so that it can flexibly movealong with the demands of the workforce and the changing demands of people's lives. The implementation of School-Based Management (SBM) isessentially the granting of greater autonomy to schools with the ultimate goalof improving the quality of the results of the implementation of education sothat it can produce actual achievements through a well established managerial process. School-based management is the granting of broadautonomy at the level of the education unit in order to be able to manageresources and sources of funds and allocate according to the level of need. The aim of school-based management is to improve the efficiency ofeducation quality by independence and flexibility in managing existing resources. Components in school-based management include management ofcurriculum and teaching programs, management of teaching staff,management of students, financial management and financing, managementof educational facilities and infrastructure, public relations management and special service management. Supporting factors for the success of the firstschool-based management, the demands of a considerable democratic life from the people in the reform era. Second, the application of Law No. 22 of1999 concerning Regional Government which emphasizes the autonomy of government at the district / city level. Third, there is a school committee thatfunctions to help implement the Social Safety Net (JPS) program in many schools. Fourth, there is a desire by the government to increase communityparticipation in education by increasing the duties, functions and roles of the Education Provider Assistance Agency (BP3). Factors that become obstaclesin running school-based management come from students, educators, infrastructure and community participation.
PENGARUH DISIPLIN KERJA TERHADAP KINERJA GURU MTS SE- KOTA BANDAR LAMPUNG
Authors: Hadiati Eti
Published: October 2018

Teachers’ performance is one of the factors that is necessary to organize theexcellent education and learning. Teachers’ performance improvement effortis influenced by many factors, including discipline of work. The problem isdiscipline of work is not be a culture of school academic. The method used inthis research was a quantitative method with survey approach and thelocation of this reserch is at MTs around Bandar Lampung with 82 personsof respondences chosen as the sample. Research result shows that disciplineof work has a positive effect and significant to teachers’ performance of theMts around Bandar Lampung.
Application of geostatistical analyst methods in discovering concealed gold and pathfinder elements as geochemical anomalies related to ore mineralisation
Authors: Lindagato Philemon , Li Yongjun , Yang Gaoxue , Duan Fenghao , Wang Zuopeng
Published: October 2018

The study area in the West Junggar Basin is known to be rich in hydrothermal gold deposits and occurrences, even though there has been minimum exploration in the area. It is here hypothesised that this area could host more gold deposits if mineral exploration methods were to be reinforced. This research is aimed at identifying geochemical anomalies of Au, and determining possible factors and conditions which facilitate the formation of anomalies by referring to As and Hg as gold pathfinders. Geostatistical analyst techniques have been applied to 9,852 stream sediments and bedrock data collected on a total surface of 1,280 km2 of West Junggar, Xinjiang (northwest China). The kriging interpolation and quantile-quantile plot methods, combined with statistical methods, successfully identified both Au and its pathfinders’ anomalies. In the present study, median was considered as background values (10.2 ppm for As, 9.13 ppb for Hg and 2.5 ppb for Au), whereas the 95th percentile were threshold values (28.03 ppm for As, 16.71 ppb for Hg and 8.2 ppb for Au) and values greater than thresholds are geochemical anomalies. Moreover, the high concentrations of these three discovered elements are caused primarily by hydrothermal ore mineralisation and are found to be controlled mainly by the Hatu and Sartohay faults of a northeast-southwesterly direction as well as their related secondary faults of variable orientation, which facilitate the easy flow of hydrothermal fluids towards the surface resulting in the formation of geochemical anomalies. Most of anomalies concentration of Au are found near the mining sites, which indicates that the formation of new Au anomalies is influenced by current or previous mining sites through geological or weathering processes. In addition, the low concentration of gold and its pathfinders found far from active gold mine or faults indicates that those anomalies are formed due to primary dispersion of hosting rock.
Facies characterisation of a shallow-water deltaic succession: the Upper Jurassic Wagad Sandstone Formation of Kachchh, western India
Authors: Joseph Jaquilin K. , Patel Satish J.
Published: October 2018

Ancient deltaic facies are difficult to differentiate from tidally influenced shallow-marine facies. The Wagad Sandstone Formation of the Wagad Highland (eastern Kachchh Basin) is typified by offshore and deltaic facies with sedimentary characteristics that represent different conditions of hydrodynamics and related depositional processes. The study area, the Adhoi Anticline, constitutes a ~154-m-thick, shale-dominated sequence with progressive upward intercalations of bioturbated micritic sandstone and quartz arenite. Two thickAstartebeds (sandy allochemic limestone), with an erosional base and gravel blanketing, illustrate tidal amplification and high-energy stochastic events such as storms. Sedimentological characteristics document three depositional facies: an offshore, shale-dominated sequence prograding to proximal prodeltaic micritic sandstone and quartz arenite with sandy allochemic limestones, further prograding to mouth bars and abandoned channel deposits. The Wagad Sandstone Formation displays depositional environmental conditions that are dissimilar from those of coeval deposits in Kachchh sub-basins as well as on regional and global scales. This is attributed to a reactivation of the Kachchh Mainland and South Wagad faults which resulted in detachment and uplift of the Wagad block which then experienced prograding deltaic conditions.
Analysis of Device Failure in the Mechanical Production Plant
Authors: Sitko Jacek , Mikuš Rastislav , Božek Pavol
Published: October 2018

The article evaluates the failure rate of devices in the Mechanical Processing Plant using a traditional quality tool, the Pareto-Lorenzo diagram. A comparative analysis of failure rates was performed, recorded in repair, inspection and maintenance card. Then, changes were proposed in order to reduce failure rates and earlier detection of equipment malfunctions. In order to analyze the failure rate of grain washer equipment during thick coal preparation process, one quality management tools was used - the Pareto-Lorenzo diagram. In this case, it is important to assess the mechanical failure of devices, and demonstrating which devices generate most repairs. Based on materials made available by the mine, such as: Repair, inspection and maintenance cards, Device cards, DTR documentation. Quantitative and qualitative assessment the most frequently occurring mechanical failures during operation of devices in process enrichment of coarse sizes was carried out. An attempt was made to assess failure rate of devices on a grain washer. A comparative analysis of failure rates in 2015-2017 recorded in the repair, inspection and maintenance card was carried out. Then, changes were proposed to stand, in order reduce failure rates, and earlier detection equipment malfunctions.
Influence of Constructional and Kinematic Parameters of the New Solution of Roadheader Mining Head on the Effectiveness of its Work
Authors: Kotwica Krzysztof , Sienkiewicz Paweł
Published: October 2018

The paper presents a new solution of a mining head for roadheader designed for hard and very hard rock mining. The mining head was equipped with mini disk tools with a complex trajectory. The results of field tests were presented, under which the effectiveness of the new mining head solution was observed. The load and vibrations of the mining head, dustiness and grain size of the excavated material as well as disk tool wear were measured. These tests were carried out for various constructional and material parameters of the used asymmetrical mini disk tools and kinematic parameters of the mining head.
Literature Research in the Field of Technology Assessment Using a Tool of a Systematic Literature Review
Authors: Palka Dorota , Brodny Jarosław , Rızaoğlu Tamer , Bağci Utku , Maščeník Jozef
Published: October 2018

The article presents the results of literature research in the field of Technology Assessment (TA). In particular, the attention was focused on searching for trends determining the directions of development of this research area. Research gaps constituting the basis for undertaking new cognitive challenges were identified. As a research method, a systematic review of literature was adopted, the methodology of which was described in the first part of the article. The analysis includes a total of 1788 TA-related scientific articles available in Google Scholar and BazTech databases. The practical part of the article presents fragments of literature research and an attempt to define the concepts of Technology Assessment on their basis. The collected research material showed a high degree of variation in the scope of definitions and the research area covered by TA. This indicates the need to conduct further research in this area for the purpose of clarifying the research area which TA deals with. It is legitimate to say that the development of research in this area is necessary due to the increasing impact of technology on society.
Analysis of Weldings’ Incompatibility in Constructions
Authors: Mazur Magdalena , Kuchariková Lenka
Published: October 2018

The paper presents an analysis of the causes and consequences of nonconformity that has been made in the welding of structural elements. The most frequent incompatibilities in this process were identified and RPN determined for them. The implementation of corrective and preventive actions in the identified critical areas was suggested based on the conducted analysis. After the implementation of corrective actions the re-calculation of the value of the RPN has been made. The paper presents the importance of visual inspection in the process of supervising finished products from the construction welding process. Elements of selected processes carried out in welded structures over two months were analyzed.
Identification Accuracy of Additional Wave Resistance Through a Comparison of Multiple Regression and Artificial Neural Network Methods
Authors: Cepowski Tomasz
Published: October 2018

The article presents the use of multiple regression method to identify added wave resistance. Added wave resistance was expressed in the form of a four-state nominal function of: “thrust”, “zero”, “minor” and “major” resistance values. Three regression models were developed for this purpose: a regression model with linear variables, nonlinear variables and a large number of nonlinear variables. The nonlinear models were developed using the author's algorithm based on heuristic techniques. The three models were compared with a model based on an artificial neural network. This study shows that non-linear equations developed through a multiple linear regression method using the author’s algorithm are relatively accurate, and in some respects, are more effective than artificial neural networks.
Example of Using Lean Manufacturing Tools in Assessing and Improving the Process of Car Arm Rest Production
Authors: Molenda Michał , Biernot Aneta , Cierna Helena
Published: October 2018

The paper deals with the use of Lean Manufacturing tools in improving the production process of car arm rests in a car manufacturing company in Poland. The article describes the original condition of a single production process of assembling ready pieces to produce car arm rests. The original condition was assessed and described with the use of some basic Lean indicators and value stream mapping. The aforementioned tools allowed to assess the process condition and to identify the organizational issues and their sources. It also enabled to reorganize the process and increase its efficiency. The further part of the article describes the results of improvement actions. The process assessment was held and improvements introduced in the first quarter of 2018.
Microbiological Risk Assessment and Bioprocess Engineering
Authors: Płaza Grażyna , Achal Varenyam , Kumari Deepika
Published: October 2018

The Europe 2020 strategy (European Commission, 2010) calls a bioeconomy as a key element for smart and green growth in Europe. The development of a greener and more resource-efficient economy gives rise to new technologies and materials, which in turn may result in increased exposure to biological agents or combinations of different potentially harmful factors. For example, the expanding recycling industry employs an increasing number of workers which have to face various health problems (pulmonary, gastrointestinal and skin problems) as a result of exposure to biological agents such as airborne microorganisms. However, specific numbers for occupational diseases in this sector are still lacking. There are various workplaces and professional activities especially from the green industry for which exposure to microbiological agents occur unexpectedly and in an uncontrolled way. The issue of uncontrolled microbial exposure there is for example in waste treatment and for retrofitting activities, both growing sectors of employment in a greening society. As a result of the problem in the green industrial sector, there is a need to develop tools for risk assessment and prevention measures. In order to be able to develop suitable risk management strategies, a further development of detection and identification methods for biological agents is needed to cover the whole spectrum of microorganisms. the present paper focuses on the microbiological risk assessment in the context of the development of new and safe industrial products and processes of green industry (bioindustry and bioprocessing).
Innovative Adaptive Control of Material Fatigue Test Machines Using an MCS Controller
Authors: Heyduk Adam , Kalinowski Krystian , Kaula Roman , Pielot Joachim
Published: October 2018

The paper presents some issues related to the control of fatigue test machines based on W(t) parameter taking into account the simultaneous interaction of stress and strain. This parameter is defined as a product of these values. Such a research method represents a new approach in fatigue testing with an innovative control system. Because of the W(t) function characteristics, the system presents nonlinear behavior and there is a significant deterioration of the control quality and the controlled signal significantly differs from the reference signal waveform. This problem can be solved by introducing a nonlinear block into the feedback loop. Fatigue tests have been carried out for sinusoidal and randomized reference signal waveforms. These tests have proved that the controlled signal follows reference values with an appropriate control quality.
A Fast Method of Identifying Rechargeable Batteries Condition and Defects
Authors: Kuliński Krzysztof , Nowrot Andrzej
Published: October 2018

The paper presents fast method of identifying industrial and general use rechargeable batteries condition and defects exemplary lithium-ion cells. The proposed method is based on measuring a internal battery electrical impedance for selected frequency points and the next the results are compare with reference characteristics. Diagnostic process is performed for a few minutes when the battery is charging or discharging. So far used, the most popular methods require controlled charging and discharging cells to determine approximately of their capacity and need a long time of the diagnostic process (about few hours to over a dozen hours). The new method allows the dramatically reduction of measurement time and in effect reduces financial work costs of service. The paper shows a various setup systems with commonly use RLC impedance bridges were used in the research. The analysis of measurements allowed to determine the specific spectral function, which indicates rechargeable battery condition. Moreover, it is also possible to apply the obtain method to another electrochemical cell type.
New Way of Monitoring of the Production Environment with Application of Augmented Reality and Artificial Intelligence
Authors: Szajna Andrzej , Szajna Janusz , Stryjski Roman , Basl Josef , Brodny Jarosław
Published: October 2018

Augmented reality technology (AR), also known as mixed reality, allows to enhance the seen reality with additional, virtual objects, displayed right in front of the user’s eyes. The article presents the concept of using Augmented Reality glasses, to support the user with pre-defined knowledge and instructions, giving the ability to do the job without almost any idea of what should be done. The operator simply follows the instructions shown in front of the eyes and communicate with the system with simple gesture and voice. Additionally, the article touches the topic of Artificial Intelligence (AI) which will allow the system in the future to have not only the pre-defined, hard coded instructions, but also the flexibility to give different hints to the user based on a different situation observed.
Mechanisation of Longwall Extraction of Hard and Abrasive Rocks
Authors: Bołoz Łukasz , Krauze Krzysztof , Kubín Tomáš
Published: October 2018

The article presents the current topic of the possibility of mechanical extraction of hard and abrasive rocks using mechanized wall systems. The problem of extracting ores from thin strata precludes the possibility of further use of current technologies involving a human at the face. Currently, the operation is carried out using explosives in column-pillar systems. In systems with a chamber column, all major processes are mechanized and carried out by self-propelled drilling and bolting machines, loaders as well as hauling and auxiliary trucks. These machines are operated in the workplace by operators. For many years, effective mechanical excavation methods were sought that would allow the development of a mining machine and a mechanised longwall complex. Such a complex is to allow excavation without the presence of humans at the face. The article presents the current technical capabilities, assumptions and requirements for such a solution. Then, an innovative longwall complex equipped with a disc shearer is introduced. The technology of work and achievable productivity are briefly presented. A worn shearer, a face conveyor and a powered support are the subject of AGH inventions.
Continuous Quality Improvement of an Engineering Program as a Requirement for Abet Accreditation
Authors: Grebski Michalene Eva , Wolniak Radosław , Grebski Wieslaw
Published: October 2018

The paper addresses the benefits from accreditation of an Engineering program. The criteria for accreditation are also being discussed as well as the cost of domestic and outside of the United States (US) accreditation. The paper also contains procedures for curriculum development as well as evaluation and assessment. Implementation of a comprehensive continuous quality improvement process (CQI) for individual courses as well as the entire Engineering program is being discussed and analyzed. The conclusions include practical recommendations for the effective closing of the CQI loop.
The Case Study of Bottlenecks Identification for Practical Implementation to the Theory of Constraints
Authors: Urban Wieslaw , Rogowska Patrycja
Published: October 2018

According to the Theory of Constraints by Goldratt system bottlenecks are key to improving productivity and profitability of the entire production system. An important issue in the practical application of this theory is to identify bottlenecks in the system. The aim of this paper is to develop practical steps to identify bottlenecks in the production system characterised by a homogeneous flow. The paper includes a case study which shows six steps that allowing to specify not only the first bottleneck of the system but to develop a comprehensive plan for removing bottlenecks.