Scientific Research and Essays

  • Abbreviation: Sci. Res. Essays
  • Language: English
  • ISSN: 1992-2248
  • DOI: 10.5897/SRE
  • Start Year: 2006
  • Published Articles: 2760

SRE Articles

Psychological impotence: Psychological erectile dysfunction and erectile dysfunction causes, diagnostic methods and management options

October 2013

Psychological impotence or erectile dysfunction is nowadays a pretty common yet misunderstood disorder. People often cannot detect it properly and misunderstood it for physical impotence. Psychological impotence is basically caused by psychological problems. Most of the times, this kind of impotence are curable. Recent study has shown that most of the cases of impotence are basically of this nature. Numbers of sexual...

Author(s): Kingston Rajiah, Sajesh K Veettil, Suresh Kumar and Elizabeth M. Mathew

Diurnal variation in stature in Nigerian children

October 2013

While total stature has been demonstrated to decrease throughout the day, whether a diurnal effect applies to Nigerian children has not been reported, the aim of this study was to investigate diurnal stature variation in school children in Makurdi, Nigeria. The stature of 625 children aged 9 to 16 years were measured twice (morning and afternoon) on the same day with a wall mounted stadiometer. The first measurements...

Author(s): Daniel T. Goon, Abel L. Toriola and Simon W. Akusu

Effects of baffles geometry on sloshing dynamics of a viscous liquid tank

October 2013

Baffles are used effectively to reduce the sloshing response of liquid in the liquid storage containers. In this paper, a brief equivalent method is proposed to model the influence of different baffle geometrical effects on liquid sloshing. It has been showed that the natural frequencies and the dynamic response of the liquid in the container are drastically changed if the free liquid surface in a cylindrical container...

Author(s): Morteza Shahravi and Milad Azimi

Pediculosis among primary school children in Calabar, Nigeria and implications for control

October 2013

This study was undertaken to determine the prevalence of head lice among primary school children in a semi-urban area of Calabar, Cross River State, Nigeria. A total of 204 children aged 6 to 12 years from both genders had their hair and scalp examined by visual inspection for head lice. A questionnaire was used to assess children’s knowledge about the ectoparasite – Pediculus humanus capitis. The...

Author(s): Etim S. E., Ohioma M. E., Okon O. E. and Akpan P. A.

Thermo elastic analysis of a functionally graded cylinder under internal pressure using first order shear deformation theory

September 2013

Thermo elastic analysis of a functionally graded cylinder under mechanical and thermal loads is investigated analytically in the present paper. The first order shear deformation theory (FSDT) is employed for analysis of the problem. FSDT recognizes two components for definition of the deformation. Displacement of the mid-plane and rotation about that are two components of deformation. The modulus of elasticity is...

Author(s): M. Arefi and G. H Rahimi

Job satisfaction among selected workers in St Lucia, West Indies

September 2013

The aim of this study was to investigate the level of job satisfaction among supermarket workers. A self administered questionnaire survey was conducted from July-September 2007. Data were collected from 111 supermarket workers in a major supermarket located in Vieux Fort, Saint Lucia. Respondents were asked to complete a 10-item job satisfaction questionnaire. The response rate was 74%. The percentage of satisfied...

Author(s): R. O. Orisatoki and O. O. Oguntibeju

Wireless attendance management system based on iris recognition

September 2013

Iris recognition verification is one of the most reliable personal identification methods in Biometrics. With the rapid development of iris recognition verification, a number of its applications have been proposed until now including time attendance system etc. In this paper, a wireless iris recognition attendance management system is designed and implemented using Daugman’s algorithm (Daugman, 2003). This system...

Author(s): Seifedine Kadry and Mohamad Smaili

Policies on population, development and pollution of the Black Sea basin

September 2013

The Black Sea is a closed basin which is connected to Aegean Sea through Bosporus and Dardanel Straits: The basin is encircled with six countries from which major rivers Danube, Dniester, Dnieper, YeÅŸilirmak, Kizilirmak and Sakarya run through to the sea, which carry and discharge pollution from industrial, agricultural and domestic sources to Black Sea Basin that grows cumulatively. They discharge into virtually...

Author(s): D. S. Beyazli, Z. Y. Bayram and S. Aydemir

Laboratories at the Faculty of Medicine of the University of Coimbra in the XIX century

September 2013

The beginning of natural sciences came to predominate in medicine with the emergence of natural scientific thinking in the first half of the 19th century. Philosophical approaches became less relevant. Research concentrated on the biological, physiological and chemical foundations of life. Therefore, the creation of laboratories of experimental physiology, histology, toxicology and pathological anatomy was the result of...

Author(s): Maria Burguete

Estimating soil available nitrogen with a hot H2O2/KCl extraction

September 2013

Appropriate and simple analysis methods for an accurate estimation of soil N mineralization potential are required to optimize N fertilizer recommendations. We used soils from non-cultivated and cultivated plots in central Côte d’Ivoire to investigate the quantum of ammonium (NH4+) that could potentially be mineralized. The soil was first treated with H2O2 at 60°C for 2, 4, 6 or 8 h (and referred to...

Author(s): T. B. Tié, L. N. Diby, , E. Seyo and A. Assa

Developing prototype model of discharge planning with CD learning media in Indonesia

September 2013

Discharge planning (DP) is a crucial part in continuous nursing care and its aim is to prepare the patient and the family to return home. Discharge planning has not been optimally conducted. The study’s purposes are to identify the implementation of discharge planning, to develop an organized discharge planning model and to evaluate the implementation of this model. An action research with triangulation studies...

Author(s): Rr. Tutik Sri Hariyati, Efy Afifah and Hanny Handiyani  

Prediction of climatic change for the next 100 years in Southern Italy

September 2013

This study investigates the impact of the expected climate changes in the Apulia region (Southern Italy) for the next 100 years on the climatic water balance variations, climatic classifications and crop water requirements. The overall results indicated that an increase of temperature, in the range between 1.3 and 2.5°C, is expected in the next 100 years. The reference evapotranspiration (ETo) variations would...

Author(s): Burçak Kapur, Steduto Pasquale, Servet Tekin, Mladen Todorovic, S. Metin Sezen, Mete Özfidaner and Zekai GümüÅŸ

Determination of sound transfer coefficient of boron added waste cellulosic and paper mixture panels

September 2013

When the studies about the effects of noise on the human health were investigated, it was determined that the noise has physiological, pathological, psychological and psycho-social results and affects sense organs, circulatory, respiration, digestion, excretory and nervous systems in terms of physiology. In this research, a sound insulation study was carried out in order to minimize the negative effects of sound on the...

Author(s): Abdulkerim Ilgun, M. Tolga Cogurcu, Celalettin Ozdemir, Erkan Kalipci and Serkan Sahinkaya  

Etiologies of patients admitted to emergency department with hypoglycemia

September 2013

Hypoglycemia is the most common endocrinologic problem seen in emergency departments. To explore its causes in patients who admitted to the emergency department with symptoms resembling hypoglycemia, 225 hypoglycemia cases were evaluated from January 2000 to May 2008. Of 225 hypoglycemia cases, 158 (70.2%) were receiving treatment for diabetes mellitus, which was the most common group (94 patients were using insulin, 55...

Author(s): Sevki Hakan Eren, Haci Mehmet Caliskan, Fatih Kilicli, Ilhan Korkmaz, Fettah Acibucu and Hatice Sebila Dokmetas

Pre-service mathematics teachers’ conceptions about the relationship between continuity and differentiability of a function

September 2013

Our purpose in this paper is to investigate and show how pre-service mathematics teachers think about the continuity and differentiability of functions given in the form of both graphical and symbolic  representations and how they link these two basic and important calculus concepts. The study was conducted in two phases. First, the participants were asked to complete several tasks...

Author(s): Adem Duru, Önder Köklü and Elizabeth Jakubowski

Particle swarm optimization performance on special linear programming problems

September 2013

Linear programming (LP) is one of the best known optimization problems solved generally with Simplex Method. Most of the real life problems have been modeled as LP. The solutions of some special LP problems exhibiting cycling have not been studied except for the classical methods. This study, aimed to solve some special LP problems, exhibit cycling with Particle Swarm Optimization (PSO) and to show PSO performance for...

Author(s): Pakize ErdoÄŸmuÅŸ  

Variations in alanine aminotransferase and aspartate aminotransferase activities in African catfish: Clarias gariepinus (Burchell, 1822) at different sublethal concentrations of potassium permanganate

September 2013

Potassium permanganate (KMnO4) is a widely used freshwater aquaculture chemotherapeutant for the treatment and prevention of waterborne parasitic and fungal diseases. The specific objective of this research is to determine its effects on alanine aminotransferase and aspartate aminotransferase activities in the plasma of the widely consumed African catfish, Clarias gariepinus. C. gariepinuswere exposed to...

Author(s): Kori-Siakpere Ovie, Ikomi Robert Bemigho and Ogbe Martin Gbemi

Analysis of missing values in simultaneous linear functional relationship model for circular variables

September 2013

Missing values arise in many research fields and is a common problem in analysis. Unlike linear data, the methods proposed to handle missing values for circular variables have not been developed. This could be contributed to the closed form of circular variables. An imputation methods based on circular mean by column and sample circular mean are proposed for the simultaneous linear functional relationship model for...

Author(s): S. F. Hassan, Y. Z. Zubairi and A. G. Hussin

Wear resistance in hardfacing applied in substrate SAE 1020 using welding process Gas Tungsten Arc Welding (GTAW) alloy Stellite 6 in powder form

September 2013

This article describes an innovative application of hardfacing using Gas Tungsten Arc Welding (GTAW) process with alloys in powder form incorporated directly into the weld puddle. Stellite 6 alloy was used on the substrate of SAE 1020 steel mainly due to wear resistance. The good wear resistance is due to the characteristics of Co-Cr carbide dispersed in a matrix alloy deposited. Vickers hardness data,...

Author(s): Paulo Cezar Moselli, Marcelo Falcão de Oliveira and João Roberto Sartori Moreno

Evaluation of the productivity of soil amended with different animal wastes in an acid ultisol at Abakaliki, Southeast Nigeria

September 2013

An experiment was carried out in order to evaluate the productivity of soil amended with different animal wastes at the Teaching and Research Farm at the Faculty of Agriculture and Natural Resources Management, Ebonyi State University, Abakaliki. The field was laid out in randomized complete block design (RCBD) comprising of poultry droppings (PD), swine waste (SW), goat droppings (GD), cow dung (CD) and control (c)...

Author(s): Nwite J. N., Okolo C. C. and Ezeaku, P. I.

Adaptive bandwidth allocation for call-level quality-of-service (QoS) in wireless mobile networks

September 2013

Different quality-of-service (QoS) required types of multimedia services and need a guaranteed service rate in wireless multimedia networks. When the number of user arrivals increases, bandwidth degradations may occur due to limited bandwidth nature of cellular wireless networks. The bandwidth that should be assigned to user cannot be met for QoS provisioning in congested network. In this paper, a priority-based call...

Author(s): Aytül BOZKURT  

Effect of crop fortification with pulse sprout extract on crop growth and seed yield in rice var Co 48

September 2013

Rice is the staple food for over half of the Indian population, hence great emphasis has to be laid on ways and means to fortify seeds organically for better seed vigour. Seed fortification is one of the important seed invigoration treatment. Germinated grains are good sources of ascorbic acid, riboflavin, choline, thiamine, tocopherols and pantothenic acid which increases the nutritional quality. Extract has been...

Author(s): Jayanthi M., R. Umarani, and V. Vijayalakshmi,

Hydromorphone (OROS): Its efficacy in acute and chronic pain

September 2013

Pain control in chronic and acute disease conditions such as cancer pain or post-operative pain is often adequate with the help of appropriate pharmacological agent. A comprehensive review of numerous studies conducted to evaluate the efficacy of hydromorphone (OROS) for the management of acute and chronic pain was performed. Data from 17 controlled trials were reviewed, taking into consideration the...

Author(s): Rohit Kumar Verma, Piyush Mittal, Ankur Barua and Suresh Kumar

Use of mycorrhiza in soil remediation: A review

September 2013

Mycorrhiza-assisted remediation (MAR) is a sustainable method of remediation that uses natural organisms for soil remediation. It is a technique that not only ensures the removal of soil pollutants but also improves the structure of the soil and helps in plant nutrient acquisition. Thus, it helps in vegetation/revegetation of polluted soils after treatment. MAR can be used for the removal of both organic and inorganic...

Author(s): Chibuike, G. U.

Analysis of the link between injuries on forest trees and presence of harmful fungal organisms

September 2013

This research focus on the occurrence of pathogenic microorganisms on beech trees relative to the presence of tree injuries, with the aim to ensure protection and preservation of this species in Serbia. The research was conducted in eastern Serbia, in a hillside beech forest Fagetum moesiacae submontanum of generative origin. The testing was carried out on two sites over 51 testing plots, with a total of 829 trees and...

Author(s): Miroslava MARKOVIC, Dragan MITIC, Snezana RAJKOVIC, Ljubinko RAKONJAC, Aleksandar LUCIC, Miroslav MARKOVIC and Radoslav RAJKOVIC

Hybrid particle swarm optimization: Evolutionary programming approach for solving generation maintenance scheduling problem

September 2013

This paper presents a hybrid particle swarm optimization based genetic algorithm and hybrid particle swarm optimization based evolutionary programming for solving long-term generation maintenance scheduling problem. In power system, maintenance scheduling is being done upon the technical requirements of power plants and preserving the grid reliability. The objective function is to sell electricity as much as possible...

Author(s): G. Giftson Samuel and C. Christober Asir Rajan

Comparison of an analogue and computer supported line generalisation following the concrete example of the Sitnica River system

September 2013

Cartography is a science which most presents changes over ever increasing modern computer technologies. A computer supported generalisation of water flow sets its goal on the effects and achievements of modern cartography science, also showing the results and the levels of basic manual generalisation, comparing them with the effects of a digital computer supported generalisation. Every newly made map which represents...

Author(s): Aleksandar Valjarević, Dragica Živković and Vladica Stevanović

Salient features of vector control in AC motor drives: A review

September 2013

This paper presents a review of vector control methods for AC drives for the last decade. A variety of techniques with different concepts are mentioned for the control of induction motors (IMs), permanent magnet synchronous motors (PMSMs), double fed induction generators (DFIGs) and switched reluctance motors (SRMs). Vector control has advanced its concept to AC drives for high performance applications with the help of...

Author(s): Sarat Kumar Sahoo and A. Ramulu

Field-programmable gate array (FPGA)-based designed using VHDL hardware description language transmission performance analysis of binary phase shift keying (BPSK) and quadrature phase shift Keying (QPSK) modulators

September 2013

Binary phase shift keying (BPSK) and quadrature phase shift Keying (QPSK)modulation techniques are often proposed for satellite communications and band-limited communication channels; however, both modulations are important in high speed data communications. High speed data communications are implemented on high speed hardware in wireless systems. The paper presents the design of a QPSK and BPSK...

Author(s): Mehmet SÖNMEZ and Ayhan AKBAL

Implementation of Fourier Expansion Based Differential Quadrature Method (FDQM) and Polynomial Based Differential Quadrature Method (PDQM) for the 2D Helmholtz Problem

September 2013

The polynomial-based differential quadrature method (PDQM) and Fourier expansion-based differential quadrature method (FDQM) are examined to solve 2D Helmholtz problem expressing definition of many electromagnetic problems. PDQM and FDQM solution of the problems were calculated and compared, analytically. While grid node and wave number are steady, the PDQM and FDQM were applied to 2D Helmholtz problem for calculation...

Author(s): Ahmet Rifat GORGUN, Sukru OZEN and Selcuk HELHEL

Comparison of design alternatives generated by computer aided design and user expectations from small urban spaces

September 2013

This study investigates the compliance of alternative design models based on perception of designer and users by creating 3D models of the fields before construction. The application part of this work presents 4 different ground cover materials, modeled on the computer, that were proposed for 2 predetermined small urban areas to apply the design in the highest demand. Questionnaire participants were then asked to...

Author(s): Buket Özdemir Işık and Öner Demirel

Artificial neural network approach to buckling coefficients of laminated orthotropic rectangular plates with a centrally rectangular hole

September 2013

The objective of the present study is to describe the results of research that has been conducted on the buckling behavior of rectangular laminated orthotropic plates that have a rectangular hole. As a result of using some geometrical holes which cause stress concentrations on laminated orthotropic plates, the analysis about the buckling coefficient of the elements become very important. This work deals with buckling...

Author(s): Mehmet Fatih Altan

Chemokine receptor 3 (CXCR3) and its ligands contribution to virus-induced acute hepatic failure

September 2013

The role of chemokines in virus-induced acute hepatic failure is not well defined. In this study, we investigated the role of CXC chemokine receptor 3 (CXCR3) and its ligands chemokine Mig/CXCL9 (monokine induced by IFN-gamma) and IP-10/CXCL10 (interferon-gamma-inducible protein 10) in the recruitment of intrahepatic lymphocytes and subsequent acute hepatic failure. Balb/cJ mice (6 to 8 weeks, female) were...

Author(s): Yong Zou , Junjie Bao and Yuesi Zhong

Morphotaxonomic evaluation of the relationship between four species of Crassocephalum (Moench.) S. Moore (Asteraceae) in southwestern Nigeria

September 2013

The morphotaxonomic identity of Crassocephalum biafrae (Oliv. & Hiern.) S. Moore was compared with other three taxa namely: Crassocehalum crepidioides (Benth.) S. Moore, Crassocephalum rubens (Juss.ex.Jacq.) S. Moore and, Crassocephalum togoense C.D. Adams in the genus Crassocephalum tribe Senecioneae; with the intent of establishing some delimiting...

Author(s): A. S. OYELAKIN and M. S. AYODELE

Impact of computer graphics on the engineering product design: Conceptual analysis

August 2013

Computer graphics matured over many years and played an important role in the development of engineering products like automotive and aircraft components. The current CAX (CAD/CAM/CAE) tools use computer graphics extensively, while helping in conceiving better designs with improved quality. Nowadays, engineering product development is being done concurrently and collaboratively, due to the advances in computer graphics....

Author(s): Osama Harfoushi, Ruba Obiedat, Rizik Al-Sayyed and Bashar Al-Shboul

Diagnosis and recommendation integrated system (DRIS) model establishment for diagnosing Sorghum (Sorghum bicolor) nutrient status in Benin (West Africa)

August 2013

The Diagnosis and Recommendation Integrated System (DRIS) is a potential method for interpreting plant foliar nutrient composition. It provides a reliable means of linking leaf nutrient concentrations to the yield of sorghum, and has been developed for this crop using experimental data from organic and inorganic trials carried out in the Upper Catchment of Benin. Grain yield and leaf nutrient concentration were used to...

Author(s): Gustave D. Dagbenonbakin, Valentin Kindomihou, Emile C. Agbangba, Nestor Sokpon and Brice Sinsin

Aircraft noise pollution assessment of Port Harcourt International Airport, Omagwa, Rivers State, Nigeria

August 2013

An expressive survey, measurement and analysis of aircraft noise pollution assessment at the Port Harcourt International Airport, Omagwa, Rivers State, Nigeria has been performed. The study collaborated both sound levels and environmental pollution of aircrafts noise impact on the communities. Physical/acoustic measurements of the airport were carried out through the use of a BK Precision digital sound level meter....

Author(s): Ogobiri, Godwin Ebikabowei, Owate, Israel, Avwiri, Gregory Onomakereand Mebine Promise

An inverse feedback fuzzy state space modeling (FFSSM) for insulin-glucose regulatory system in humans

August 2013

The complexity and nonlinearity of the insulin-glucose regulatory system in humans demands for an inverse modeling technique. In this study the insulin-glucose regulatory system was modeled with the help of an inverse feedback fuzzy state space modeling (FFSSM) approach. The feedback insulin regulatory system was presented as a state space model, its input/output parameters fuzzified and the optimized values...

Author(s): Izaz Ullah Khan,, Tahir Ahmad, and Normah Maan,

Improved (G’/G)- expansion method for constructing exact traveling wave solutions for a nonlinear PDE of nanobiosciences

August 2013

In the present paper, the improved (G’/G) - expansion method combined with suitable transformations is used to construct many exact solutions involving parameters of a nonlinear equation describing the nano-ionic currents along microtublues. As a result, hyperbolic function solutions, trigonometric function solutions and rational function solutions with parameters are obtained. When these parameters are taken...

Author(s): Elsayed M. E. Zayed, Yasser A. Amer and Reham M. A. Shohib

Ocean wave energy – An option for Nigerian power situation

August 2013

As energy presents itself in various forms, here we will be looking at it from the perspective of wave energy. This paper investigates wave theory and use of some forms of mechanical wave fronts to generate electrical energy. A major means of production of these waves is discussed - being the wave front from the ocean, which is presently a source of worry to the people of Lagos State, Nigeria. These wave fronts from the...

Author(s): Collins Neku NWAOKOCHA and Abayomi Temitope LAYENI

A robust digital watermarking technique based on feature and transform method

August 2013

This paper proposed a new robust digital watermarking technique with an aim of image protection. The proposed technique incorporates both the transform and feature methods. Initially, the Harris Laplacian detector extracts the features from the cover image that suites well for the watermarking. The extracted characteristic regions are grouped to form a primary feature set where the secret message is embedded to form a...

Author(s): A. Umaamaheshvari and K. Thanushkodi

A collection of new preconditioners for solving linear systems

August 2013

In this paper, new preconditioners from class of (I+S)-type for solving linear systems are developed and preconditioned, accelerated overrelaxation (AOR) method is used for the systems. The proposed algorithms have a simple and graceful structure. Asymptotic convergence of the sequence generated by the methods to the unique solution of linear systems is proved, along with a result regarding the convergence rate of the...

Author(s): H. Saberi Najafi and S. A. Edalatpanah,

A combinatorial approach to human face recognition and expression identification

August 2013

A new integrated approach to human face recognition and expression identification based on Gray Level Co-occurrence Matrix (GLCM) technique that will be useful for  Human Face Recognition and Feature Extraction system based on Local Ternary Pattern (LTP) for expression identification was introduced. It applies GLCM operation to extract the features of facial images to different classes for the purpose of image...

Author(s): M. Madhu and R. Amutha

On meromorphic functions with fixed residue defined using convolution

August 2013

In this paper, we introduced a new subclass of meromorphic functions with residue, which is defined by means of a Hadamard product (or convolution). Then we determine some properties such as coefficient bound, distortion theorems, radius of starlikeness and convexity for this class.   Key words: Analytic, meromorphic functions, Hadamard product, convolution.

Author(s): F. Müge Sakar and H. Ozlem Güney

Stability analysis for a turbocharger rotor system under nonlinear hydrodynamic forces

August 2013

Turbocharger is a high speed rotor system supported by a pair of floating ring bearings which comprise of double oil films. The stability of its rotor system is governed by not only the structure of the rotor but also by the nonlinear hydrodynamic force of two oil films. In this paper, a lumped dynamics model is developed for a turbocharger rotor system. In order to investigate the nonlinear behavior of the rotor...

Author(s): Hao Zhang, Zhanqun Shi, Shunxin Zhang, Fengshou Gu and Andrew Ball

Placement of distributed generation units using multi objective function based on SA algorithm

August 2013

This article presents an optimal placement method in order to size and sit distributed generation in IEEE 33 bus test system. The algorithm for optimization in this paper is Simulated Annealing. The proposed objective function considers active power losses of the system and the voltage profile in nominal load of system. In order to use Simulated Annealing algorithm, at first, placement problem is written as an...

Author(s): Mohammad Salehi Maleh, Ramtin Rasouli Nezhad and Noradin Ghadimi

Efficiency of slash bundling in mature coniferous stands

August 2013

The biomass of forests is one of the oldest and most popular sources of renewable energy. Aside from round wood, logging residue is also being used with increasing frequency to produce energy. Under European conditions, the most frequently implemented technology of using logging residue is chipping, either directly at the cutting site or at the forest roadside. However, for over a dozen years now, with more and more...

Author(s): Tadeusz Moskalik, Jarosław Sadowski, Wojciech Sarzyński and Dariusz Zastocki

Smart structures and material technologies in architecture applications

August 2013

Smart structures and material technologies are a tool for sharing the knowledge of how various building materials can significantly increase production and profit using advanced communication, collaboration and management technologies. The paper provides an overview of the types of materials available giving a new insight into innovative methods and techniques that will be available, and open new doors for advancement...

Author(s): Sherif Mohamed Sabry Elattar

Open sources three-dimensional ultrasound volumetric rendering in object oriented approach

August 2013

On account of the advanced technology in recent years, the increasing demand for an effective medical imaging system has addressed its significance in diagnosis especially in the development of three-dimensional medical image reconstruction. Based on literature revise on various computational investigated, none of them show efficiency in terms of cost and computing performance. Owing to this fact, a method of 3D...

Author(s): Lai Khin Wee, Hum Yan Chai and Eko Supriyanto

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