Tạp chí Phát triển Khoa học và Công nghệ Đại học Quốc gia Thành phố Hồ Chí Minh

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A new method in synthesis of polyurethane/graphite oxide nanocomposites by twin-screw extruder
Huy Thuc Ha, Nhan Thuc Chi Ha, Van Thi Khanh Khuat, Tam Thanh Mai
In this study, we have synthesized polyurethane based on monoglyceride and 4.4 '-diphenyl methanediisocyanate (MDI) – an environmentally friendly polymer. Graphene oxite (GO) was used to reinforce for polyurethane forming polyurethane/graphene oxide (PU/GO) nanocomposite. The synthesis of PU and PU/GO was performed directly on the twinscrew extruder. This is a simple, time saving, economical and e...... hiện toàn bộ
Key factors affecting on the success of ERP projects in Vietnam
Hien Thi Nguy, Trung Quoc Pham
Today, enterprise resource planning system (ERP) becomes popular and it is implemented in most business (in all fields and sizes) all over the world as well as in Vietnam. However, according to consultant experts, ERP projects, though on a large scale with high cost, entail low success rate. For Vietnamese contexts, those findings above are all the more true, because most of Vietnamese enterprises...... hiện toàn bộ
SUBSTRATE TEMPERATURE EFFECTS ON STRUCTURE AND ELECTRICAL CHARACTERISTICS OF TCO THIN FILM SnO2: Sb PREPARED BY REACTIVE MAGNETRON SPUTTERING
Tuan Tran, Dat Thanh Huynh, Ngoc Van Le, Hien Ngoc Pham, Trang Le Thanh Hoang
The transparent electrode films SnO2: Sb were prepared by reactive magnetron sputtering method on glass substrate with various substrate temperatures. The material of target is alloy of Sn (99,5% purity) doped Sb (5% Sb by weight). The deposition processes were carried out in mixture of Ar (99,99% purity) and 02 (99,999% purity) gas. The vacuum inside the deposition chamber can get to about 10-5 t...... hiện toàn bộ
OPTIMAL STRIP LAYOUT OF IRREGULAR SHAPES CUTTING FROM RECTANGULAR SHEET
Bong Dang Tran, Tuan Ngoc Pham, Nguyen Dai Tran, Tuan Minh Ho
This article deals with optimal nesting problem when parts are cut from rectangular sheet in the footwear industry. The objective of the research is minimizing the waste of material or maximizing the number of parts to be cut from sheet materials. By generating the mathematical models and building up their algorithms, the software for solving problem dedicates to a number of industries for saving ...... hiện toàn bộ
SOURCE ROCKS IN CUU LONG BASIN OF VIETNAM’S CONTINENTAL SHELF
Bui Thi Luan
The aim of this work is to describe the source rocks in Cuu long Basin mainly consisting Cenozoic sediments (lower Oligocene + upper Eocene, upper Oligocene and lower Miocene) that are poor to rich in organic matter. The organic carbon (TOC%) in lower Oligocene + upper Eocene source rocks contains mostly kerogen type II, sometimes type I, III is 1.19-2.87%; in upper Oligocene source rocks containi...... hiện toàn bộ
THE FACTORS EFFECT THE STRENGTH OF MIXING COLUMN
Ngo Van Dau
Basing on collecting and classifying the researches in soil mixing column method, and applying soil mixing column method at Sai Gon East West highway, this article wants to state and analysis the factors that effect strength and stability of mixing column. It also has some comments of applying this method in soil improvement.
WATER RESOURCE MANAGEMENT IN HO CHI MINH CITY, VIETNAM: AN OVERVIEW
Phu Le Vo
Water is a resource needed in all aspects of life and is regarded as a decisive factor for Earth's ecosystems survival. However, water resource has also become a limiting factor of social and economic development. For cities of the developing world, water is increasingly playing a vital role in sustainable urban development. Since economic reform known as “Doi Moi" (renovation) in 1986, Ho Chi Min...... hiện toàn bộ
THE EFFECT OF SOME CONSTITUENT ON THE ENERGIES IN QUANTUM WELL SYSTEMS
Bui Trung Thanh, Le Khac Binh
By finite difference method, the Schrödinger equation with different effective masses in different layers of some quantum well systems is solved. From this, the effect of number of wells, barrier width, well width, electric field on energies in quantum well systems are investigated.
A Design of 10-b 100-MS/s Pipelined Folding ADC with Distributed Track-and-Hold Preprocessing
Duc Hung Le, Binh Son Le, Trong Tu Bui
This paper presents a 10-b ADC designed in a 0.18-μm CMOS technology. The ADC achieves 10-b resolution by using the cascaded folding technique in both the fine and coarse converters. Folding stages are pipelined to improve the settling time. As a result, this ADC can achieve the sampling rate up to 100MS/s. Moreover, instead of using a costly single track-and-hold circuit, a distributed track-and-...... hiện toàn bộ
On the performance of cooperative cognitive networks with selection combining and proactive relay selection
Tra Thanh Luu, Lien Hong Pham, Son Que Vo, Khuong Van Ho
This paper proposes an outage analysis framework for cooperative cognitive networks with proactive relay selection and selection combining (SC) under licensed outage constraint, maximum transmit power constraint, independent non-identical (i.n.i) fading distributions, erroneous channel information, and licensed users’ interference. Towards this end, we firstly suggest power allocation for unlicens...... hiện toàn bộ
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