Phương pháp thi IELTS

The research "Solving constrained optimization tasks in civil engineering using εDifferential Evolution developed with Visual C#. NET" work aims at constructing an evolutionary algorithm based approach for solving complex constrained optimization tasks. The  -Differential Evolution (  -DE) proposed by Takahama, et al. [1], is selected as the employed evolutionary approach. The  -DE has been proven to be capable optimizer for tackling sophisticated problems in various engineering field. In this study, this optimization method is developed in Visual C#.

5p xuanphongdacy09 29-09-2024 1 1   Download

One-loop contributions to the decay process \(H \to Z*\gamma \to {v_e}{v_e} \gamma \) in standard model are performed in the paper "One-loop contributions to in standard model \(H \to Z*\gamma \to {v_e}{v_e} \gamma \)". The detailed computations are carried out in unitary gauge. In physical results, we present numerical results for partial decay width and its distribution. We find that the partial decay width is given to 0.466 KeV. This result is in the upper bound of the current experimental data at the Large Hadron Collider.

9p xuanphongdacy09 29-09-2024 4 2   Download

Bài giảng Kinh tế học vĩ mô 1 - Chương 5: Mô hình IS-LM và sự phối hợp chính sách tài khóa và chính sách tiền tệ, được biên soạn với mục tiêu nhằm giúp sinh viên hiểu về phương pháp xây dựng mô hình IS – LM: là mô hình xác định trạng thái cân bằng đồng thời của thị trường hàng hóa (đường IS) và thị trường tiền tệ (đường LM); Phân tích tác động của CSTK; CSTT trên mô hình IS-LM; Hiểu được sự cần thiết phải phối hợp các chính sách vĩ mô.

11p khanhchi2550 10-05-2024 7 1   Download

Aims and objectives of the study: This study is designed with an aim to improve students‟ writing performance of English by applying genre-based approach to teach writing skill to students.

56p closefriend09 16-11-2021 24 3   Download

Objectives of the research: The aim of this research is to investigate the use and the effectiveness of taking advantage of reading in teaching writing in Vietnamese classrooms. At the same time, it also creates the environments for students to write confidently basing on reading skills.

25p caphesuadathemmuoi 11-11-2021 13 2   Download

PBL is a learning method by activities. It attracts students to use their gained knowledge realistically. This article presents the learning by training and projects and its process. The article also analyses and introduces the obtained results at the faculty of scientific basic in the University of Transport and Communication.

9p larachdumlanat127 20-12-2020 27 4   Download

To define the quality of tests is a difficult problem in current education. Many evaluating methods have been introduced, but they are too complicated for many teachers. This paper proposes to use SPSS software to define the quality of tests.

8p tamynhan5 10-12-2020 26 6   Download

The thesis is an answer for debating question regarding of pathologic characteristics of drowning and proposes the DNA analysis for identification method. The description study concluded the valuable pathologic signs and characteristics for diagnosis. In this study, the DNA analysis was applied for victims identification.

27p tamynhan0 15-06-2020 35 0   Download

Mục tiêu của nghiên cứu này nhằm xác định các nhân tố ảnh hưởng đến xu hướng tiêu dùng cá của người dân thành thị, thành phố Cần Thơ. Các phương pháp kiểm định Cronbach Alpha, phân tích nhân tố khám phá EFA và hồi quy tuyến tính đa biến được sử dụng trong nghiên cứu. Số liệu của nghiên cứu được thu thập từ 202 người tiêu dùng ở khu vực thành thị, thành phố Cần Thơ.

11p hanh_tv23 26-03-2019 89 3   Download

. In this paper, we present an approach to lighting design in applications where the expected result of the lighting design process for a 2D image. In this approach, the lighting-by-example method using wavelet-based objective function is used in combination with an interactive interface in order to optimize lighting parameters for an object or a group of objects individually, and then the visual results of these separate processes are combined (utilizing 3D depth information) in the seamless generation of a final 2D image.

12p binhminhmuatrenngondoithonggio 09-06-2017 51 4   Download

In this paper, the passivity based-principle is applied to design a controller for DFIG, in which the Euler - Lagrange (EL) based-method and Hamiltonian rules are incorporated. The proposed controller overcomes static error of the current controller without Hamiltonian rules. The system can also offer exellent performances above and below synchronous speeds of the DFIG.

8p binhminhmuatrenngondoithonggio 09-06-2017 50 4   Download

This paper presents new carrier-based PWM modulations to control this dual topology for optimum operation. In terms of power sources, this cascaded inverter is operated either from isolated dc sources (series power cells) or from a single dc source. Computational simulation and experimental validation are given to verify the proposed techniques.

11p binhminhmuatrenngondoithonggio 09-06-2017 44 2   Download

In this paper, a description method for partial shapes is introduced with the use of Fourier transformation. The proposed method allows to easily get a partial Fourier set which is invariant with respect to translation, rotation and scaling, to minimize the required parameter numbers for describing partial shapes.

12p binhminhmuatrenngondoithonggio 09-06-2017 28 2   Download

Chapter 1 presents the way how to be a good learner. This chapter include contents: Describing a good learner: difficult, the importance of students’ motivation, Who is responsible for learning? Characteristics of good classroom learners,... Inviting you to refer.

8p kiepnaybinhyen_03 11-12-2015 94 16   Download

Trichloroisocyanuric acid synthesis process was studied by using DFT method. The obtained results demonstrate that the keto-enol isomerization of the cyanuric acid is a base-catalyzed reaction. It is possible that in the presence of NaOH the process of moving hydrogen in the cyanuric acid molecule and the reaction of neutralizing cyanuric acid can execute consecutively. And in this case NaOH plays the role as a donor of hydroxyl group catalyzing the movement of hydrogen and as neutralizing agent in an exothermal process.

6p uocvong04 24-09-2015 61 3   Download

Recently, some of the furoquinoline alkaloids were found to have an interesting biological activity, for example, anti-cancer, antiplatelet aggregation and antifungal activities. The interesting biological activity made these compounds 1-13 attractive targets in organic chemistry. A novel generally applicable synthesis of furoquinolines is described. The condensation of 2- methoxy aniline and malonic acid in the presence of POCl3 gave 2,4-dichloro-8- methoxyquinoline. Then, treatment of this compound with sodium methoxide in methanol under reflux afforded 4,8-dimethoxyquinoline.

5p uocvong04 24-09-2015 68 5   Download

This paper reports on the study for determination of Methamphetamine in urine samples by GC-MS method using Solid Phase E.xtraction (SPE). The aim of the study was investigation on the GC-MS method for determination of Methamphetamine in urine samples. The method is based on the extraction of Methamphetamine by using of Solid Phase Extraction technique with C18 and its determination by GC-MS. The method was then successfully applied for the determination of Methamphetamine in real samples.

6p uocvong04 24-09-2015 68 4   Download

The preconcentration method of mercury and arsenic in the ground water samples by co-precipitation with PbS was developed. In the range of HCl concentrations from 0.1 - 0.6M and 10 mg of Pb as a collector in the sulphite form after adding 2% thioacetamide solution, the traces of mercury and arsenic were quantitatively separated from a large volume water sample (200 ml). This method has been applied for determination of mercury and arsenic traces in the ground water samples collected in Ho Chi Minh City by neutron activation analysis. The method is simple, rapid and reliable.

5p uocvong04 24-09-2015 63 6   Download

In this article, iron nanoparticles were synthesized by reduction of FeCl3.6H2O 0,045M using NaBH4 0,25M. Characteristics of obtained iron particales were studied by Transmission Electron Microscopy (TEM), X-ray diffraction method (XRD) and BET specific surface area, and maximum benzen adsorption. The TEM results of synthesized iron nanoparticales show that iron particles are spherical in shape and connected in chains, the particale size is about 3 - 50nm. The X-ray results show that synthesized nanoparticles is iron at 44.720.

4p uocvong02 24-09-2015 59 3   Download

One of the subjects of Ni-MH batteries studies is justly the electrochemically active material for the positive electrode-hydroxide nickel. This hydroxide Ni(OH)2 has been prepared in laboratory by chemical sedimentation from NiCl2 and NaOH solutions. The obtained product has been examined using different techniques, such as X ray Diffraction (XRD), Scanning Electronic Microscope (SEM) and electrochemical polarisation (cyclic voltammetry CV). The obtained results of obtained Ni(OH)2 show -type crystal, with grains of about 15 µm.

5p uocvong01 24-09-2015 50 4   Download