TẠP CHÍ KHOA HỌC TRƯỜNG ĐHSP HÀ NỘI 2: CHUYÊN SAN KHOA HỌC TỰ NHIÊN VÀ CÔNG NGHỆ
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Optimization of extraction of flavonoid and polyphenol from Camellia megasepala leaves and their anticancer activity
TẠP CHÍ KHOA HỌC TRƯỜNG ĐHSP HÀ NỘI 2: CHUYÊN SAN KHOA HỌC TỰ NHIÊN VÀ CÔNG NGHỆ - Tập 4 Số 01 - Trang 12-19 - 2025
Camellia megasepala Hung T. Chang & Trin Ninh, found in Na Hang district, Tuyen
Quang province, contains a significant amount of flavonoids and polyphenols,
which are important phenolic compounds known for their various biological
activities beneficial to human health, including antibacterial and
anti-inflammatory effects. This study applied the response surface methodology
(RSM) to examine the in...
#Optimization #flavonoid #polyphenol #cancer #Camellia
Algorithm optimizing profitability in the manufacturing industry
TẠP CHÍ KHOA HỌC TRƯỜNG ĐHSP HÀ NỘI 2: CHUYÊN SAN KHOA HỌC TỰ NHIÊN VÀ CÔNG NGHỆ - Tập 2 Số 3 - Trang 19-33 - 2025
This article focuses on optimizing profitability in the manufacturing sector by
integrating critical elements such as production, pricing, resource allocation,
and cost analysis. Through preliminary steps, the article proposes a complex
mathematical model to maximize profit by making intelligent decisions regarding
production and pricing. Predicting demand, analyzing costs, and allocating
resource...
#algorithm #optimizing profitability #production #pricing #resource allocation #cost analysis
Essential oil of the leaves of Cinnamomum subpenninervium Kosterm. ex H. H. Pham and its antimicrobial activity
TẠP CHÍ KHOA HỌC TRƯỜNG ĐHSP HÀ NỘI 2: CHUYÊN SAN KHOA HỌC TỰ NHIÊN VÀ CÔNG NGHỆ - Tập 3 Số 2 - Trang 80-86 - 2025
The current study first describes the chemical composition of the leaf essential
oil of Cinnamomum subpenninervium Kosterm. ex H.H. Pham collected from Nghe An
province, Central Vietnam. By the GC-FID/MS (gas chromatography-flame ionization
detection/mass spectrophotometry) analysis, more than thirty compounds were
identified, representing 99.92%. The obtained essential oil from the fresh
leaves ...
#Cinnamomum subpenninervium #Lauraceae #E-cinnamaldehyde #essential oil #antimicrobial
Solvability Analysis of high-order Linear Differential-Algebraic Equations with time-varying coefficients
TẠP CHÍ KHOA HỌC TRƯỜNG ĐHSP HÀ NỘI 2: CHUYÊN SAN KHOA HỌC TỰ NHIÊN VÀ CÔNG NGHỆ - Tập 3 Số 1 - Trang 64-77 - 2025
In this paper, we study the solvability analysis of arbitrarily high-order
linear differential-algebraic equations (DAEs) with time-varying coefficients,
using the algebraic-behavior approach. We propose a concept of strangeness-index
and construct condensed forms for high-order linear DAEs. We also discuss other
structural properties like the existence and uniqueness of a solution,
consistency an...
#Differential-algebraic equation #strangeness-index #regularization #index reduction
The decay of SM-like Higgs boson \(h_0^1 \to Z \gamma\) in a G221 model
TẠP CHÍ KHOA HỌC TRƯỜNG ĐHSP HÀ NỘI 2: CHUYÊN SAN KHOA HỌC TỰ NHIÊN VÀ CÔNG NGHỆ - Tập 3 Số 2 - Trang 18-34 - 2025
The decay of SM-like Higgs boson \(h_0^1 \to Z \gamma\) in the G221 model which
is one of all models beyond the SM (BSM) has been investigated. This decay
channel has not been observed experimentally. In the framework, we indicate that
new particles predicted by this model may significantly affect the previously
mentioned decay channel of the SM-like Higgs boson. We will study the effects of
the n...
#Higgs boson decay #rare decay of Higgs boson #extensions of Standard Model #Higgs sector #the G221 model
The ammonium adsorption capacity of coffee husk‑derived activated carbon composite with \(\text{MnFe}_2\text{O}_4\)
TẠP CHÍ KHOA HỌC TRƯỜNG ĐHSP HÀ NỘI 2: CHUYÊN SAN KHOA HỌC TỰ NHIÊN VÀ CÔNG NGHỆ - Tập 4 Số 01 - Trang 39-47 - 2025
In this study, a composite material between MnFe2O4 and activated carbon from
coffee husks (MFO/AC) was synthesized using co precipitate and hydrothermal
methods to remove ammonium from aqueous solutions. The characteristics of MFO/AC
were characterized and evaluated by scanning electron microscopy (SEM) and
Fourier transform infrared spectra (FTIR). The ammonium adsorption process of
MFO/AC was ...
#\(\text{MnFe}_2\text{O}_4\)/AC #ammonium #composite materials #coffee husk #activated carbon
On the tangent sets of constraint systems
TẠP CHÍ KHOA HỌC TRƯỜNG ĐHSP HÀ NỘI 2: CHUYÊN SAN KHOA HỌC TỰ NHIÊN VÀ CÔNG NGHỆ - Tập 1 Số 1 - Trang 31-39 - 2022
In this paper, we present some new results on chain rules for the first-order
tangent cone and the second-order tangent set of constraint systems under the
assumption on the calmness of the constraint set mapping with canonical
perturbation. The obtained results improve and extend the corresponding results
in [3], [11], and [12].
#Calmness #metric subregularity #first-order tangent cone #second-order tangent set #chain rule
The synthesis of TCNQ-based material with derivative of leucine amino
TẠP CHÍ KHOA HỌC TRƯỜNG ĐHSP HÀ NỘI 2: CHUYÊN SAN KHOA HỌC TỰ NHIÊN VÀ CÔNG NGHỆ - Tập 1 Số 1 - Trang 53-59 - 2022
A new material, Leu(CH3)4-TCNQ, has been successfully synthesized from
Tetracyanoquinondimethane (TCNQ) and amino acid ester, N,N,N-Trimethyl-L-Leucine
Methyl ester ((Leu(CH3)4+). This material was characterized by modern
physicochemical methods such as: X-ray diffraction technique (XRD), Raman,
Infrared (FT-IR) and UV-Vis spectroscopy and voltammetric technique. This result
will offering a new di...
#TCNQ #material #structure #synthesis #amino acids
Study on the adsorption L- and D- proline on MKN-MWCNT-P5000 carbon nanotubes from aqueous solutions
TẠP CHÍ KHOA HỌC TRƯỜNG ĐHSP HÀ NỘI 2: CHUYÊN SAN KHOA HỌC TỰ NHIÊN VÀ CÔNG NGHỆ - Tập 3 Số 2 - Trang 50-58 - 2024
Carbon nanotubes (CNTs) are a new type of nano-adsorbent material with unique
properties, which are promising adsorbents for the separation of enantiomers.
Information regarding the interaction mechanism of enantiomers with carbon
nanotubes has not yet been fully explored yet. In this work, we studied the
adsorption of L and D-proline on carbon nanotubes in aqueous solution.
Adsorption isotherms o...
#Carbon nanotubes #enantiomers of proline #adsorption #computer simulation
Blockchain with IoT to enhance security, data integrity, and automation
TẠP CHÍ KHOA HỌC TRƯỜNG ĐHSP HÀ NỘI 2: CHUYÊN SAN KHOA HỌC TỰ NHIÊN VÀ CÔNG NGHỆ - Tập 4 Số 01 - Trang 84-94 - 2025
The integration of Blockchain technology with the Internet of Things (IoT)
presents a transformative approach to addressing critical challenges in
security, data integrity, and automation. This paper explores the synergies
between these technologies, proposing a framework that leverages the
decentralized and immutable nature of Blockchain to enhance IoT ecosystems. By
eliminating single points of ...
#Blockchain #IOT #system #industrial #technology #security
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