Tạp chí Phát triển Khoa học và Công nghệ Đại học Quốc gia Thành phố Hồ Chí Minh
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The Vietnamese Language in some newspaper issues
Tạp chí Phát triển Khoa học và Công nghệ Đại học Quốc gia Thành phố Hồ Chí Minh - Tập 16 Số 3 - Trang 108-119 - 2013
This paper presents some random surveys done by the author on an issue of Tuoi
Tre newspaper (March 8, 2010, 20 pages, ads excluded). Results: I collected over
100 sentences and passages (approximately eight A4 pages (font size 12, Times
New Roman) which I considered bearing “errors” or “problems”. In general, there
are three types of errors: (i) errors of logics or expression, (ii) lexical
errors...
Determination of the electric dipole (E1) gamma ray strength function of 56Mn from the Bn level to low levels by two-step gamma cascades
Tạp chí Phát triển Khoa học và Công nghệ Đại học Quốc gia Thành phố Hồ Chí Minh - Tập 19 Số 1 - Trang 83-93 - 2016
Investigation of gamma ray strength function is necessary to determine some
nuclear characteristics, such as: spin, parity, electromagnetic transitions,
cross section, … In this research, 55Mn target was activated on the neutron of
3rd horizontal channel of Dalat nuclear reactor. The experimental data was
collected by event-event coincidence by gammagamma coincidence system. The 56Mn
deexcitation ...
ON ONE OF HERSTEIN'S CONJECTURES
Tạp chí Phát triển Khoa học và Công nghệ Đại học Quốc gia Thành phố Hồ Chí Minh - Tập 12 Số 11 - Trang 5-10 - 2020
Let D be a division ring with the center F. We say that N is a subgroup of D
with understanding that N is in fact a subgroup of the multiplicative group D*
of D. In this note we disscus the conjecture which was posed by Herstein in 1978
[2, Conjecture 3]: If N is a subnormal subgroup of D which is radical over F,
then N is contained in F. In his paper, Herstein himself showed that the
conjecture i...
STUDY ON THE AERODYNAMIC DRYING TECHNOLOGY WIT PARTICLE CLASSIFICATION FOR PASTE MATERIALS
Tạp chí Phát triển Khoa học và Công nghệ Đại học Quốc gia Thành phố Hồ Chí Minh - Tập 11 Số 11 - Trang 49-56 - 2021
Nowadays, we often meet the problem of paste materials drying in the industries
of chemistry, pharmacy, agricultural product processing, Differentiating normal
particles, paste materials are often agglutinate and difficult to be dried.
Besides, agglutinated material mass after drying, in many cases, need further
crushing and classification, which makes the process high cost. The integration
of aer...
Detection of real earnings management: The case of Vietnamese listed companies
Tạp chí Phát triển Khoa học và Công nghệ Đại học Quốc gia Thành phố Hồ Chí Minh - Tập 19 Số 4 - Trang 81-93 - 2016
There are a great number of incentives that drive managements to manipulate
firms’ profit. Beside exploiting the allowed discretional accrual choices,
managers could perform real earnings management by altering the normal operating
scale of the companies. This paper examines the three most prevalent means of
real earnings management, including (1) boost in sales through price discounts
or more len...
HEATS OF FORMATION OF COMPOUNDS: QUANTUM CALCULATIONS INSTEAD OF EXPERIMENTAL METHODS
Tạp chí Phát triển Khoa học và Công nghệ Đại học Quốc gia Thành phố Hồ Chí Minh - Tập 2 Số 4&5 - Trang 84-89 - 2021
Using ab initio molecular orbital theory or Density Functional Theory to
calculate standard-heats of formation of compounds instead of experimental
methods which are expensive, needing high educational experts on spectro-scopic
methods and in several cases are not been able to measure. Calculations can also
be used to predict heats of formation for compounds for which these quantities
are not expe...
Triterpenoid Glycosides from Olax imbricata
Tạp chí Phát triển Khoa học và Công nghệ Đại học Quốc gia Thành phố Hồ Chí Minh - Tập 22 Số 3 - Trang 324-334 - 2019
Introduction: Olax imbricata, owning antibacterial, antioxidant, and
anti-inflammatory activities, has been investigated as one of traditional
diabetic plants in Vietnam. In our previous publications on Olax imbricata, the
structure analysis of the isolated compounds were reported, including two
phenolic compounds, three phenolic glycosidic compounds, a sesquiterpenoid
tropolone and 1,2,3,4-tetrah...
#Olax imbricata #triterpenoid #glycoside #a-glucosidase inhibition
Simulation of electrical properties of quartz crystal microbalance using multi-resonance thickness-shear mode technique
Tạp chí Phát triển Khoa học và Công nghệ Đại học Quốc gia Thành phố Hồ Chí Minh - Tập 19 Số 4 - Trang 194-206 - 2016
The use of quartz crystal microbalance (QCM) in chemistry, biophysics,
microbiology and electronics has grown tremendously in recent years. In this
paper, the properties of a QCM sensor (a system include QCM device and
viscoelastic medium) operating in the range of 5 MHz to 35 MHz of
Multi-resonance Thickness-Shear Mode (MTSM, n = 1, 3, 5, 7) are described. We
calculate the changes both in resonan...
RAPID PROTOTYPYING A NEW CONCEPT IN MANUFACTURING
Tạp chí Phát triển Khoa học và Công nghệ Đại học Quốc gia Thành phố Hồ Chí Minh - Tập 2 Số 4&5 - Trang 51-62 - 2021
Rapid Prototyping (RP), e.g. Stereolithography - a new concept in manufacturing
can generate 3D models directly from 3D Computer Aided Design model data, making
a design tangible within a short period of time. In the design developing
process, RP dramatically reduces time and cost. Compare with the conventional
machining method, the RP technology has many of advantages such as: no tooling
preparat...
PROGRAM FOR CALCULATION OF RESISTANCE OF HIGH SPEED CRAFTS
Tạp chí Phát triển Khoa học và Công nghệ Đại học Quốc gia Thành phố Hồ Chí Minh - Tập 4 Số 5&6 - Trang 5-12 - 2021
This article introduces to a program for calculation of resistance of high-speed
crafts, and then rapidly chooses main power engines in ship design process.
Basing on the Savitsky’s calculating models, since 70’s years, this procedure is
applicable to high-speed and planing hull crafts which have big values of Froude
number. Using published experimental results of Naval testing laboratories this
p...
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